[PATCH v2] Merge ipt_LOG and ip6t_LOG, add ring bufffer support

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* [PATCH v2] Merge ipt_LOG and ip6t_LOG, add ring bufffer support
@ 2012-01-22 21:56 Richard Weinberger
  2012-01-22 21:56 ` [PATCH 1/6] Netfilter: Merge ipt_LOG and ip6_LOG into xt_LOG Richard Weinberger
                   ` (5 more replies)
  0 siblings, 6 replies; 15+ messages in thread
From: Richard Weinberger @ 2012-01-22 21:56 UTC (permalink / raw)
  To: netfilter-devel; +Cc: netdev, linux-kernel, eric.dumazet, jengelh

Hi!

This patch set merges ipt_LOG and ip6t_LOG and adds ring buffer support
to xt_LOG.

Using "--ring" a user can create LOG rules which log messages into
one or more ring buffers.
Each ring buffer is represented as pipe-like file in
/proc/net/netfilter/xt_LOG_ring/.

Ring buffer support can be enabled/disabled using
CONFIG_NETFILTER_XT_TARGET_LOG_RING.

Changes since v1:
 - Merged ipt_LOG and ip6t_LOG
 - Implemented ring buffer support as part of xt_LOG.

[PATCH 1/6] Netfilter: Merge ipt_LOG and ip6_LOG into xt_LOG
[PATCH 2/6] ring_buffer: Export for_each_buffer_cpu()
[PATCH 3/6] xt_log: Make printk() in sb_close() optional
[PATCH 4/6] Netfilter: xt_LOG: Implement ring buffer support
[PATCH 5/6] iptables: Merge libip6t_LOG and libipt_LOG into
[PATCH 6/6] iptables: xt_LOG: Add ring buffer support

Any feedback is welcome!

Thanks,
//richard

^ permalink raw reply	[flat|nested] 15+ messages in thread

* [PATCH 1/6] Netfilter: Merge ipt_LOG and ip6_LOG into xt_LOG
  2012-01-22 21:56 [PATCH v2] Merge ipt_LOG and ip6t_LOG, add ring bufffer support Richard Weinberger
@ 2012-01-22 21:56 ` Richard Weinberger
  2012-01-30  9:01   ` richard -rw- weinberger
  2012-01-22 21:56 ` [PATCH 2/6] ring_buffer: Export for_each_buffer_cpu() Richard Weinberger
                   ` (4 subsequent siblings)
  5 siblings, 1 reply; 15+ messages in thread
From: Richard Weinberger @ 2012-01-22 21:56 UTC (permalink / raw)
  To: netfilter-devel
  Cc: netdev, linux-kernel, eric.dumazet, jengelh, Richard Weinberger

ipt_LOG and ip6_LOG have a lot of common code, merge them
to reduce duplicate code.

Signed-off-by: Richard Weinberger <richard@nod.at>
---
 include/linux/netfilter/Kbuild          |    1 +
 include/linux/netfilter/xt_LOG.h        |   19 +
 include/linux/netfilter_ipv4/ipt_LOG.h  |    2 +
 include/linux/netfilter_ipv6/ip6t_LOG.h |    2 +
 net/ipv4/netfilter/Kconfig              |    9 -
 net/ipv4/netfilter/Makefile             |    1 -
 net/ipv4/netfilter/ipt_LOG.c            |  516 -----------------
 net/ipv6/netfilter/Kconfig              |    9 -
 net/ipv6/netfilter/Makefile             |    1 -
 net/ipv6/netfilter/ip6t_LOG.c           |  527 ------------------
 net/netfilter/Kconfig                   |    9 +
 net/netfilter/Makefile                  |    1 +
 net/netfilter/xt_LOG.c                  |  921 +++++++++++++++++++++++++++++++
 13 files changed, 955 insertions(+), 1063 deletions(-)
 create mode 100644 include/linux/netfilter/xt_LOG.h
 delete mode 100644 net/ipv4/netfilter/ipt_LOG.c
 delete mode 100644 net/ipv6/netfilter/ip6t_LOG.c
 create mode 100644 net/netfilter/xt_LOG.c

diff --git a/include/linux/netfilter/Kbuild b/include/linux/netfilter/Kbuild
index e144f54..613e618 100644
--- a/include/linux/netfilter/Kbuild
+++ b/include/linux/netfilter/Kbuild
@@ -22,6 +22,7 @@ header-y += xt_CT.h
 header-y += xt_DSCP.h
 header-y += xt_IDLETIMER.h
 header-y += xt_LED.h
+heyder-y += xt_LOG.h
 header-y += xt_MARK.h
 header-y += xt_nfacct.h
 header-y += xt_NFLOG.h
diff --git a/include/linux/netfilter/xt_LOG.h b/include/linux/netfilter/xt_LOG.h
new file mode 100644
index 0000000..cac0790
--- /dev/null
+++ b/include/linux/netfilter/xt_LOG.h
@@ -0,0 +1,19 @@
+#ifndef _XT_LOG_H
+#define _XT_LOG_H
+
+/* make sure not to change this without changing nf_log.h:NF_LOG_* (!) */
+#define XT_LOG_TCPSEQ		0x01	/* Log TCP sequence numbers */
+#define XT_LOG_TCPOPT		0x02	/* Log TCP options */
+#define XT_LOG_IPOPT		0x04	/* Log IP options */
+#define XT_LOG_UID		0x08	/* Log UID owning local socket */
+#define XT_LOG_NFLOG		0x10	/* Unsupported, don't reuse */
+#define XT_LOG_MACDECODE	0x20	/* Decode MAC header */
+#define XT_LOG_MASK		0x2f
+
+struct xt_log_info {
+	unsigned char level;
+	unsigned char logflags;
+	char prefix[30];
+};
+
+#endif /* _XT_LOG_H */
diff --git a/include/linux/netfilter_ipv4/ipt_LOG.h b/include/linux/netfilter_ipv4/ipt_LOG.h
index dcdbadf..5d81520 100644
--- a/include/linux/netfilter_ipv4/ipt_LOG.h
+++ b/include/linux/netfilter_ipv4/ipt_LOG.h
@@ -1,6 +1,8 @@
 #ifndef _IPT_LOG_H
 #define _IPT_LOG_H
 
+#warning "Please update iptables, this file will be removed soon!"
+
 /* make sure not to change this without changing netfilter.h:NF_LOG_* (!) */
 #define IPT_LOG_TCPSEQ		0x01	/* Log TCP sequence numbers */
 #define IPT_LOG_TCPOPT		0x02	/* Log TCP options */
diff --git a/include/linux/netfilter_ipv6/ip6t_LOG.h b/include/linux/netfilter_ipv6/ip6t_LOG.h
index 9dd5579..3dd0bc4 100644
--- a/include/linux/netfilter_ipv6/ip6t_LOG.h
+++ b/include/linux/netfilter_ipv6/ip6t_LOG.h
@@ -1,6 +1,8 @@
 #ifndef _IP6T_LOG_H
 #define _IP6T_LOG_H
 
+#warning "Please update iptables, this file will be removed soon!"
+
 /* make sure not to change this without changing netfilter.h:NF_LOG_* (!) */
 #define IP6T_LOG_TCPSEQ		0x01	/* Log TCP sequence numbers */
 #define IP6T_LOG_TCPOPT		0x02	/* Log TCP options */
diff --git a/net/ipv4/netfilter/Kconfig b/net/ipv4/netfilter/Kconfig
index 74dfc9e..fcc543c 100644
--- a/net/ipv4/netfilter/Kconfig
+++ b/net/ipv4/netfilter/Kconfig
@@ -123,15 +123,6 @@ config IP_NF_TARGET_REJECT
 
 	  To compile it as a module, choose M here.  If unsure, say N.
 
-config IP_NF_TARGET_LOG
-	tristate "LOG target support"
-	default m if NETFILTER_ADVANCED=n
-	help
-	  This option adds a `LOG' target, which allows you to create rules in
-	  any iptables table which records the packet header to the syslog.
-
-	  To compile it as a module, choose M here.  If unsure, say N.
-
 config IP_NF_TARGET_ULOG
 	tristate "ULOG target support"
 	default m if NETFILTER_ADVANCED=n
diff --git a/net/ipv4/netfilter/Makefile b/net/ipv4/netfilter/Makefile
index 213a462..240b684 100644
--- a/net/ipv4/netfilter/Makefile
+++ b/net/ipv4/netfilter/Makefile
@@ -54,7 +54,6 @@ obj-$(CONFIG_IP_NF_MATCH_RPFILTER) += ipt_rpfilter.o
 # targets
 obj-$(CONFIG_IP_NF_TARGET_CLUSTERIP) += ipt_CLUSTERIP.o
 obj-$(CONFIG_IP_NF_TARGET_ECN) += ipt_ECN.o
-obj-$(CONFIG_IP_NF_TARGET_LOG) += ipt_LOG.o
 obj-$(CONFIG_IP_NF_TARGET_MASQUERADE) += ipt_MASQUERADE.o
 obj-$(CONFIG_IP_NF_TARGET_NETMAP) += ipt_NETMAP.o
 obj-$(CONFIG_IP_NF_TARGET_REDIRECT) += ipt_REDIRECT.o
diff --git a/net/ipv4/netfilter/ipt_LOG.c b/net/ipv4/netfilter/ipt_LOG.c
deleted file mode 100644
index d76d6c9..0000000
--- a/net/ipv4/netfilter/ipt_LOG.c
+++ /dev/null
@@ -1,516 +0,0 @@
-/*
- * This is a module which is used for logging packets.
- */
-
-/* (C) 1999-2001 Paul `Rusty' Russell
- * (C) 2002-2004 Netfilter Core Team <coreteam@netfilter.org>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- */
-#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
-#include <linux/module.h>
-#include <linux/spinlock.h>
-#include <linux/skbuff.h>
-#include <linux/if_arp.h>
-#include <linux/ip.h>
-#include <net/icmp.h>
-#include <net/udp.h>
-#include <net/tcp.h>
-#include <net/route.h>
-
-#include <linux/netfilter.h>
-#include <linux/netfilter/x_tables.h>
-#include <linux/netfilter_ipv4/ipt_LOG.h>
-#include <net/netfilter/nf_log.h>
-#include <net/netfilter/xt_log.h>
-
-MODULE_LICENSE("GPL");
-MODULE_AUTHOR("Netfilter Core Team <coreteam@netfilter.org>");
-MODULE_DESCRIPTION("Xtables: IPv4 packet logging to syslog");
-
-/* One level of recursion won't kill us */
-static void dump_packet(struct sbuff *m,
-			const struct nf_loginfo *info,
-			const struct sk_buff *skb,
-			unsigned int iphoff)
-{
-	struct iphdr _iph;
-	const struct iphdr *ih;
-	unsigned int logflags;
-
-	if (info->type == NF_LOG_TYPE_LOG)
-		logflags = info->u.log.logflags;
-	else
-		logflags = NF_LOG_MASK;
-
-	ih = skb_header_pointer(skb, iphoff, sizeof(_iph), &_iph);
-	if (ih == NULL) {
-		sb_add(m, "TRUNCATED");
-		return;
-	}
-
-	/* Important fields:
-	 * TOS, len, DF/MF, fragment offset, TTL, src, dst, options. */
-	/* Max length: 40 "SRC=255.255.255.255 DST=255.255.255.255 " */
-	sb_add(m, "SRC=%pI4 DST=%pI4 ",
-	       &ih->saddr, &ih->daddr);
-
-	/* Max length: 46 "LEN=65535 TOS=0xFF PREC=0xFF TTL=255 ID=65535 " */
-	sb_add(m, "LEN=%u TOS=0x%02X PREC=0x%02X TTL=%u ID=%u ",
-	       ntohs(ih->tot_len), ih->tos & IPTOS_TOS_MASK,
-	       ih->tos & IPTOS_PREC_MASK, ih->ttl, ntohs(ih->id));
-
-	/* Max length: 6 "CE DF MF " */
-	if (ntohs(ih->frag_off) & IP_CE)
-		sb_add(m, "CE ");
-	if (ntohs(ih->frag_off) & IP_DF)
-		sb_add(m, "DF ");
-	if (ntohs(ih->frag_off) & IP_MF)
-		sb_add(m, "MF ");
-
-	/* Max length: 11 "FRAG:65535 " */
-	if (ntohs(ih->frag_off) & IP_OFFSET)
-		sb_add(m, "FRAG:%u ", ntohs(ih->frag_off) & IP_OFFSET);
-
-	if ((logflags & IPT_LOG_IPOPT) &&
-	    ih->ihl * 4 > sizeof(struct iphdr)) {
-		const unsigned char *op;
-		unsigned char _opt[4 * 15 - sizeof(struct iphdr)];
-		unsigned int i, optsize;
-
-		optsize = ih->ihl * 4 - sizeof(struct iphdr);
-		op = skb_header_pointer(skb, iphoff+sizeof(_iph),
-					optsize, _opt);
-		if (op == NULL) {
-			sb_add(m, "TRUNCATED");
-			return;
-		}
-
-		/* Max length: 127 "OPT (" 15*4*2chars ") " */
-		sb_add(m, "OPT (");
-		for (i = 0; i < optsize; i++)
-			sb_add(m, "%02X", op[i]);
-		sb_add(m, ") ");
-	}
-
-	switch (ih->protocol) {
-	case IPPROTO_TCP: {
-		struct tcphdr _tcph;
-		const struct tcphdr *th;
-
-		/* Max length: 10 "PROTO=TCP " */
-		sb_add(m, "PROTO=TCP ");
-
-		if (ntohs(ih->frag_off) & IP_OFFSET)
-			break;
-
-		/* Max length: 25 "INCOMPLETE [65535 bytes] " */
-		th = skb_header_pointer(skb, iphoff + ih->ihl * 4,
-					sizeof(_tcph), &_tcph);
-		if (th == NULL) {
-			sb_add(m, "INCOMPLETE [%u bytes] ",
-			       skb->len - iphoff - ih->ihl*4);
-			break;
-		}
-
-		/* Max length: 20 "SPT=65535 DPT=65535 " */
-		sb_add(m, "SPT=%u DPT=%u ",
-		       ntohs(th->source), ntohs(th->dest));
-		/* Max length: 30 "SEQ=4294967295 ACK=4294967295 " */
-		if (logflags & IPT_LOG_TCPSEQ)
-			sb_add(m, "SEQ=%u ACK=%u ",
-			       ntohl(th->seq), ntohl(th->ack_seq));
-		/* Max length: 13 "WINDOW=65535 " */
-		sb_add(m, "WINDOW=%u ", ntohs(th->window));
-		/* Max length: 9 "RES=0x3F " */
-		sb_add(m, "RES=0x%02x ", (u8)(ntohl(tcp_flag_word(th) & TCP_RESERVED_BITS) >> 22));
-		/* Max length: 32 "CWR ECE URG ACK PSH RST SYN FIN " */
-		if (th->cwr)
-			sb_add(m, "CWR ");
-		if (th->ece)
-			sb_add(m, "ECE ");
-		if (th->urg)
-			sb_add(m, "URG ");
-		if (th->ack)
-			sb_add(m, "ACK ");
-		if (th->psh)
-			sb_add(m, "PSH ");
-		if (th->rst)
-			sb_add(m, "RST ");
-		if (th->syn)
-			sb_add(m, "SYN ");
-		if (th->fin)
-			sb_add(m, "FIN ");
-		/* Max length: 11 "URGP=65535 " */
-		sb_add(m, "URGP=%u ", ntohs(th->urg_ptr));
-
-		if ((logflags & IPT_LOG_TCPOPT) &&
-		    th->doff * 4 > sizeof(struct tcphdr)) {
-			unsigned char _opt[4 * 15 - sizeof(struct tcphdr)];
-			const unsigned char *op;
-			unsigned int i, optsize;
-
-			optsize = th->doff * 4 - sizeof(struct tcphdr);
-			op = skb_header_pointer(skb,
-						iphoff+ih->ihl*4+sizeof(_tcph),
-						optsize, _opt);
-			if (op == NULL) {
-				sb_add(m, "TRUNCATED");
-				return;
-			}
-
-			/* Max length: 127 "OPT (" 15*4*2chars ") " */
-			sb_add(m, "OPT (");
-			for (i = 0; i < optsize; i++)
-				sb_add(m, "%02X", op[i]);
-			sb_add(m, ") ");
-		}
-		break;
-	}
-	case IPPROTO_UDP:
-	case IPPROTO_UDPLITE: {
-		struct udphdr _udph;
-		const struct udphdr *uh;
-
-		if (ih->protocol == IPPROTO_UDP)
-			/* Max length: 10 "PROTO=UDP "     */
-			sb_add(m, "PROTO=UDP " );
-		else	/* Max length: 14 "PROTO=UDPLITE " */
-			sb_add(m, "PROTO=UDPLITE ");
-
-		if (ntohs(ih->frag_off) & IP_OFFSET)
-			break;
-
-		/* Max length: 25 "INCOMPLETE [65535 bytes] " */
-		uh = skb_header_pointer(skb, iphoff+ih->ihl*4,
-					sizeof(_udph), &_udph);
-		if (uh == NULL) {
-			sb_add(m, "INCOMPLETE [%u bytes] ",
-			       skb->len - iphoff - ih->ihl*4);
-			break;
-		}
-
-		/* Max length: 20 "SPT=65535 DPT=65535 " */
-		sb_add(m, "SPT=%u DPT=%u LEN=%u ",
-		       ntohs(uh->source), ntohs(uh->dest),
-		       ntohs(uh->len));
-		break;
-	}
-	case IPPROTO_ICMP: {
-		struct icmphdr _icmph;
-		const struct icmphdr *ich;
-		static const size_t required_len[NR_ICMP_TYPES+1]
-			= { [ICMP_ECHOREPLY] = 4,
-			    [ICMP_DEST_UNREACH]
-			    = 8 + sizeof(struct iphdr),
-			    [ICMP_SOURCE_QUENCH]
-			    = 8 + sizeof(struct iphdr),
-			    [ICMP_REDIRECT]
-			    = 8 + sizeof(struct iphdr),
-			    [ICMP_ECHO] = 4,
-			    [ICMP_TIME_EXCEEDED]
-			    = 8 + sizeof(struct iphdr),
-			    [ICMP_PARAMETERPROB]
-			    = 8 + sizeof(struct iphdr),
-			    [ICMP_TIMESTAMP] = 20,
-			    [ICMP_TIMESTAMPREPLY] = 20,
-			    [ICMP_ADDRESS] = 12,
-			    [ICMP_ADDRESSREPLY] = 12 };
-
-		/* Max length: 11 "PROTO=ICMP " */
-		sb_add(m, "PROTO=ICMP ");
-
-		if (ntohs(ih->frag_off) & IP_OFFSET)
-			break;
-
-		/* Max length: 25 "INCOMPLETE [65535 bytes] " */
-		ich = skb_header_pointer(skb, iphoff + ih->ihl * 4,
-					 sizeof(_icmph), &_icmph);
-		if (ich == NULL) {
-			sb_add(m, "INCOMPLETE [%u bytes] ",
-			       skb->len - iphoff - ih->ihl*4);
-			break;
-		}
-
-		/* Max length: 18 "TYPE=255 CODE=255 " */
-		sb_add(m, "TYPE=%u CODE=%u ", ich->type, ich->code);
-
-		/* Max length: 25 "INCOMPLETE [65535 bytes] " */
-		if (ich->type <= NR_ICMP_TYPES &&
-		    required_len[ich->type] &&
-		    skb->len-iphoff-ih->ihl*4 < required_len[ich->type]) {
-			sb_add(m, "INCOMPLETE [%u bytes] ",
-			       skb->len - iphoff - ih->ihl*4);
-			break;
-		}
-
-		switch (ich->type) {
-		case ICMP_ECHOREPLY:
-		case ICMP_ECHO:
-			/* Max length: 19 "ID=65535 SEQ=65535 " */
-			sb_add(m, "ID=%u SEQ=%u ",
-			       ntohs(ich->un.echo.id),
-			       ntohs(ich->un.echo.sequence));
-			break;
-
-		case ICMP_PARAMETERPROB:
-			/* Max length: 14 "PARAMETER=255 " */
-			sb_add(m, "PARAMETER=%u ",
-			       ntohl(ich->un.gateway) >> 24);
-			break;
-		case ICMP_REDIRECT:
-			/* Max length: 24 "GATEWAY=255.255.255.255 " */
-			sb_add(m, "GATEWAY=%pI4 ", &ich->un.gateway);
-			/* Fall through */
-		case ICMP_DEST_UNREACH:
-		case ICMP_SOURCE_QUENCH:
-		case ICMP_TIME_EXCEEDED:
-			/* Max length: 3+maxlen */
-			if (!iphoff) { /* Only recurse once. */
-				sb_add(m, "[");
-				dump_packet(m, info, skb,
-					    iphoff + ih->ihl*4+sizeof(_icmph));
-				sb_add(m, "] ");
-			}
-
-			/* Max length: 10 "MTU=65535 " */
-			if (ich->type == ICMP_DEST_UNREACH &&
-			    ich->code == ICMP_FRAG_NEEDED)
-				sb_add(m, "MTU=%u ", ntohs(ich->un.frag.mtu));
-		}
-		break;
-	}
-	/* Max Length */
-	case IPPROTO_AH: {
-		struct ip_auth_hdr _ahdr;
-		const struct ip_auth_hdr *ah;
-
-		if (ntohs(ih->frag_off) & IP_OFFSET)
-			break;
-
-		/* Max length: 9 "PROTO=AH " */
-		sb_add(m, "PROTO=AH ");
-
-		/* Max length: 25 "INCOMPLETE [65535 bytes] " */
-		ah = skb_header_pointer(skb, iphoff+ih->ihl*4,
-					sizeof(_ahdr), &_ahdr);
-		if (ah == NULL) {
-			sb_add(m, "INCOMPLETE [%u bytes] ",
-			       skb->len - iphoff - ih->ihl*4);
-			break;
-		}
-
-		/* Length: 15 "SPI=0xF1234567 " */
-		sb_add(m, "SPI=0x%x ", ntohl(ah->spi));
-		break;
-	}
-	case IPPROTO_ESP: {
-		struct ip_esp_hdr _esph;
-		const struct ip_esp_hdr *eh;
-
-		/* Max length: 10 "PROTO=ESP " */
-		sb_add(m, "PROTO=ESP ");
-
-		if (ntohs(ih->frag_off) & IP_OFFSET)
-			break;
-
-		/* Max length: 25 "INCOMPLETE [65535 bytes] " */
-		eh = skb_header_pointer(skb, iphoff+ih->ihl*4,
-					sizeof(_esph), &_esph);
-		if (eh == NULL) {
-			sb_add(m, "INCOMPLETE [%u bytes] ",
-			       skb->len - iphoff - ih->ihl*4);
-			break;
-		}
-
-		/* Length: 15 "SPI=0xF1234567 " */
-		sb_add(m, "SPI=0x%x ", ntohl(eh->spi));
-		break;
-	}
-	/* Max length: 10 "PROTO 255 " */
-	default:
-		sb_add(m, "PROTO=%u ", ih->protocol);
-	}
-
-	/* Max length: 15 "UID=4294967295 " */
-	if ((logflags & IPT_LOG_UID) && !iphoff && skb->sk) {
-		read_lock_bh(&skb->sk->sk_callback_lock);
-		if (skb->sk->sk_socket && skb->sk->sk_socket->file)
-			sb_add(m, "UID=%u GID=%u ",
-				skb->sk->sk_socket->file->f_cred->fsuid,
-				skb->sk->sk_socket->file->f_cred->fsgid);
-		read_unlock_bh(&skb->sk->sk_callback_lock);
-	}
-
-	/* Max length: 16 "MARK=0xFFFFFFFF " */
-	if (!iphoff && skb->mark)
-		sb_add(m, "MARK=0x%x ", skb->mark);
-
-	/* Proto    Max log string length */
-	/* IP:      40+46+6+11+127 = 230 */
-	/* TCP:     10+max(25,20+30+13+9+32+11+127) = 252 */
-	/* UDP:     10+max(25,20) = 35 */
-	/* UDPLITE: 14+max(25,20) = 39 */
-	/* ICMP:    11+max(25, 18+25+max(19,14,24+3+n+10,3+n+10)) = 91+n */
-	/* ESP:     10+max(25)+15 = 50 */
-	/* AH:      9+max(25)+15 = 49 */
-	/* unknown: 10 */
-
-	/* (ICMP allows recursion one level deep) */
-	/* maxlen =  IP + ICMP +  IP + max(TCP,UDP,ICMP,unknown) */
-	/* maxlen = 230+   91  + 230 + 252 = 803 */
-}
-
-static void dump_mac_header(struct sbuff *m,
-			    const struct nf_loginfo *info,
-			    const struct sk_buff *skb)
-{
-	struct net_device *dev = skb->dev;
-	unsigned int logflags = 0;
-
-	if (info->type == NF_LOG_TYPE_LOG)
-		logflags = info->u.log.logflags;
-
-	if (!(logflags & IPT_LOG_MACDECODE))
-		goto fallback;
-
-	switch (dev->type) {
-	case ARPHRD_ETHER:
-		sb_add(m, "MACSRC=%pM MACDST=%pM MACPROTO=%04x ",
-		       eth_hdr(skb)->h_source, eth_hdr(skb)->h_dest,
-		       ntohs(eth_hdr(skb)->h_proto));
-		return;
-	default:
-		break;
-	}
-
-fallback:
-	sb_add(m, "MAC=");
-	if (dev->hard_header_len &&
-	    skb->mac_header != skb->network_header) {
-		const unsigned char *p = skb_mac_header(skb);
-		unsigned int i;
-
-		sb_add(m, "%02x", *p++);
-		for (i = 1; i < dev->hard_header_len; i++, p++)
-			sb_add(m, ":%02x", *p);
-	}
-	sb_add(m, " ");
-}
-
-static struct nf_loginfo default_loginfo = {
-	.type	= NF_LOG_TYPE_LOG,
-	.u = {
-		.log = {
-			.level    = 5,
-			.logflags = NF_LOG_MASK,
-		},
-	},
-};
-
-static void
-ipt_log_packet(u_int8_t pf,
-	       unsigned int hooknum,
-	       const struct sk_buff *skb,
-	       const struct net_device *in,
-	       const struct net_device *out,
-	       const struct nf_loginfo *loginfo,
-	       const char *prefix)
-{
-	struct sbuff *m = sb_open();
-
-	if (!loginfo)
-		loginfo = &default_loginfo;
-
-	sb_add(m, "<%d>%sIN=%s OUT=%s ", loginfo->u.log.level,
-	       prefix,
-	       in ? in->name : "",
-	       out ? out->name : "");
-#ifdef CONFIG_BRIDGE_NETFILTER
-	if (skb->nf_bridge) {
-		const struct net_device *physindev;
-		const struct net_device *physoutdev;
-
-		physindev = skb->nf_bridge->physindev;
-		if (physindev && in != physindev)
-			sb_add(m, "PHYSIN=%s ", physindev->name);
-		physoutdev = skb->nf_bridge->physoutdev;
-		if (physoutdev && out != physoutdev)
-			sb_add(m, "PHYSOUT=%s ", physoutdev->name);
-	}
-#endif
-
-	if (in != NULL)
-		dump_mac_header(m, loginfo, skb);
-
-	dump_packet(m, loginfo, skb, 0);
-
-	sb_close(m);
-}
-
-static unsigned int
-log_tg(struct sk_buff *skb, const struct xt_action_param *par)
-{
-	const struct ipt_log_info *loginfo = par->targinfo;
-	struct nf_loginfo li;
-
-	li.type = NF_LOG_TYPE_LOG;
-	li.u.log.level = loginfo->level;
-	li.u.log.logflags = loginfo->logflags;
-
-	ipt_log_packet(NFPROTO_IPV4, par->hooknum, skb, par->in, par->out, &li,
-		       loginfo->prefix);
-	return XT_CONTINUE;
-}
-
-static int log_tg_check(const struct xt_tgchk_param *par)
-{
-	const struct ipt_log_info *loginfo = par->targinfo;
-
-	if (loginfo->level >= 8) {
-		pr_debug("level %u >= 8\n", loginfo->level);
-		return -EINVAL;
-	}
-	if (loginfo->prefix[sizeof(loginfo->prefix)-1] != '\0') {
-		pr_debug("prefix is not null-terminated\n");
-		return -EINVAL;
-	}
-	return 0;
-}
-
-static struct xt_target log_tg_reg __read_mostly = {
-	.name		= "LOG",
-	.family		= NFPROTO_IPV4,
-	.target		= log_tg,
-	.targetsize	= sizeof(struct ipt_log_info),
-	.checkentry	= log_tg_check,
-	.me		= THIS_MODULE,
-};
-
-static struct nf_logger ipt_log_logger __read_mostly = {
-	.name		= "ipt_LOG",
-	.logfn		= &ipt_log_packet,
-	.me		= THIS_MODULE,
-};
-
-static int __init log_tg_init(void)
-{
-	int ret;
-
-	ret = xt_register_target(&log_tg_reg);
-	if (ret < 0)
-		return ret;
-	nf_log_register(NFPROTO_IPV4, &ipt_log_logger);
-	return 0;
-}
-
-static void __exit log_tg_exit(void)
-{
-	nf_log_unregister(&ipt_log_logger);
-	xt_unregister_target(&log_tg_reg);
-}
-
-module_init(log_tg_init);
-module_exit(log_tg_exit);
diff --git a/net/ipv6/netfilter/Kconfig b/net/ipv6/netfilter/Kconfig
index 9a68fb5..d33cddd 100644
--- a/net/ipv6/netfilter/Kconfig
+++ b/net/ipv6/netfilter/Kconfig
@@ -154,15 +154,6 @@ config IP6_NF_TARGET_HL
 	(e.g. when running oldconfig). It selects
 	CONFIG_NETFILTER_XT_TARGET_HL.
 
-config IP6_NF_TARGET_LOG
-	tristate "LOG target support"
-	default m if NETFILTER_ADVANCED=n
-	help
-	  This option adds a `LOG' target, which allows you to create rules in
-	  any iptables table which records the packet header to the syslog.
-
-	  To compile it as a module, choose M here.  If unsure, say N.
-
 config IP6_NF_FILTER
 	tristate "Packet filtering"
 	default m if NETFILTER_ADVANCED=n
diff --git a/net/ipv6/netfilter/Makefile b/net/ipv6/netfilter/Makefile
index 2eaed96..d4dfd0a 100644
--- a/net/ipv6/netfilter/Makefile
+++ b/net/ipv6/netfilter/Makefile
@@ -31,5 +31,4 @@ obj-$(CONFIG_IP6_NF_MATCH_RPFILTER) += ip6t_rpfilter.o
 obj-$(CONFIG_IP6_NF_MATCH_RT) += ip6t_rt.o
 
 # targets
-obj-$(CONFIG_IP6_NF_TARGET_LOG) += ip6t_LOG.o
 obj-$(CONFIG_IP6_NF_TARGET_REJECT) += ip6t_REJECT.o
diff --git a/net/ipv6/netfilter/ip6t_LOG.c b/net/ipv6/netfilter/ip6t_LOG.c
deleted file mode 100644
index e6af8d7..0000000
--- a/net/ipv6/netfilter/ip6t_LOG.c
+++ /dev/null
@@ -1,527 +0,0 @@
-/*
- * This is a module which is used for logging packets.
- */
-
-/* (C) 2001 Jan Rekorajski <baggins@pld.org.pl>
- * (C) 2002-2004 Netfilter Core Team <coreteam@netfilter.org>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- */
-#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
-#include <linux/module.h>
-#include <linux/skbuff.h>
-#include <linux/if_arp.h>
-#include <linux/ip.h>
-#include <linux/spinlock.h>
-#include <linux/icmpv6.h>
-#include <net/udp.h>
-#include <net/tcp.h>
-#include <net/ipv6.h>
-#include <linux/netfilter.h>
-#include <linux/netfilter/x_tables.h>
-#include <linux/netfilter_ipv6/ip6_tables.h>
-#include <net/netfilter/nf_log.h>
-#include <net/netfilter/xt_log.h>
-
-MODULE_AUTHOR("Jan Rekorajski <baggins@pld.org.pl>");
-MODULE_DESCRIPTION("Xtables: IPv6 packet logging to syslog");
-MODULE_LICENSE("GPL");
-
-struct in_device;
-#include <net/route.h>
-#include <linux/netfilter_ipv6/ip6t_LOG.h>
-
-/* One level of recursion won't kill us */
-static void dump_packet(struct sbuff *m,
-			const struct nf_loginfo *info,
-			const struct sk_buff *skb, unsigned int ip6hoff,
-			int recurse)
-{
-	u_int8_t currenthdr;
-	int fragment;
-	struct ipv6hdr _ip6h;
-	const struct ipv6hdr *ih;
-	unsigned int ptr;
-	unsigned int hdrlen = 0;
-	unsigned int logflags;
-
-	if (info->type == NF_LOG_TYPE_LOG)
-		logflags = info->u.log.logflags;
-	else
-		logflags = NF_LOG_MASK;
-
-	ih = skb_header_pointer(skb, ip6hoff, sizeof(_ip6h), &_ip6h);
-	if (ih == NULL) {
-		sb_add(m, "TRUNCATED");
-		return;
-	}
-
-	/* Max length: 88 "SRC=0000.0000.0000.0000.0000.0000.0000.0000 DST=0000.0000.0000.0000.0000.0000.0000.0000 " */
-	sb_add(m, "SRC=%pI6 DST=%pI6 ", &ih->saddr, &ih->daddr);
-
-	/* Max length: 44 "LEN=65535 TC=255 HOPLIMIT=255 FLOWLBL=FFFFF " */
-	sb_add(m, "LEN=%Zu TC=%u HOPLIMIT=%u FLOWLBL=%u ",
-	       ntohs(ih->payload_len) + sizeof(struct ipv6hdr),
-	       (ntohl(*(__be32 *)ih) & 0x0ff00000) >> 20,
-	       ih->hop_limit,
-	       (ntohl(*(__be32 *)ih) & 0x000fffff));
-
-	fragment = 0;
-	ptr = ip6hoff + sizeof(struct ipv6hdr);
-	currenthdr = ih->nexthdr;
-	while (currenthdr != NEXTHDR_NONE && ip6t_ext_hdr(currenthdr)) {
-		struct ipv6_opt_hdr _hdr;
-		const struct ipv6_opt_hdr *hp;
-
-		hp = skb_header_pointer(skb, ptr, sizeof(_hdr), &_hdr);
-		if (hp == NULL) {
-			sb_add(m, "TRUNCATED");
-			return;
-		}
-
-		/* Max length: 48 "OPT (...) " */
-		if (logflags & IP6T_LOG_IPOPT)
-			sb_add(m, "OPT ( ");
-
-		switch (currenthdr) {
-		case IPPROTO_FRAGMENT: {
-			struct frag_hdr _fhdr;
-			const struct frag_hdr *fh;
-
-			sb_add(m, "FRAG:");
-			fh = skb_header_pointer(skb, ptr, sizeof(_fhdr),
-						&_fhdr);
-			if (fh == NULL) {
-				sb_add(m, "TRUNCATED ");
-				return;
-			}
-
-			/* Max length: 6 "65535 " */
-			sb_add(m, "%u ", ntohs(fh->frag_off) & 0xFFF8);
-
-			/* Max length: 11 "INCOMPLETE " */
-			if (fh->frag_off & htons(0x0001))
-				sb_add(m, "INCOMPLETE ");
-
-			sb_add(m, "ID:%08x ", ntohl(fh->identification));
-
-			if (ntohs(fh->frag_off) & 0xFFF8)
-				fragment = 1;
-
-			hdrlen = 8;
-
-			break;
-		}
-		case IPPROTO_DSTOPTS:
-		case IPPROTO_ROUTING:
-		case IPPROTO_HOPOPTS:
-			if (fragment) {
-				if (logflags & IP6T_LOG_IPOPT)
-					sb_add(m, ")");
-				return;
-			}
-			hdrlen = ipv6_optlen(hp);
-			break;
-		/* Max Length */
-		case IPPROTO_AH:
-			if (logflags & IP6T_LOG_IPOPT) {
-				struct ip_auth_hdr _ahdr;
-				const struct ip_auth_hdr *ah;
-
-				/* Max length: 3 "AH " */
-				sb_add(m, "AH ");
-
-				if (fragment) {
-					sb_add(m, ")");
-					return;
-				}
-
-				ah = skb_header_pointer(skb, ptr, sizeof(_ahdr),
-							&_ahdr);
-				if (ah == NULL) {
-					/*
-					 * Max length: 26 "INCOMPLETE [65535
-					 *  bytes] )"
-					 */
-					sb_add(m, "INCOMPLETE [%u bytes] )",
-					       skb->len - ptr);
-					return;
-				}
-
-				/* Length: 15 "SPI=0xF1234567 */
-				sb_add(m, "SPI=0x%x ", ntohl(ah->spi));
-
-			}
-
-			hdrlen = (hp->hdrlen+2)<<2;
-			break;
-		case IPPROTO_ESP:
-			if (logflags & IP6T_LOG_IPOPT) {
-				struct ip_esp_hdr _esph;
-				const struct ip_esp_hdr *eh;
-
-				/* Max length: 4 "ESP " */
-				sb_add(m, "ESP ");
-
-				if (fragment) {
-					sb_add(m, ")");
-					return;
-				}
-
-				/*
-				 * Max length: 26 "INCOMPLETE [65535 bytes] )"
-				 */
-				eh = skb_header_pointer(skb, ptr, sizeof(_esph),
-							&_esph);
-				if (eh == NULL) {
-					sb_add(m, "INCOMPLETE [%u bytes] )",
-					       skb->len - ptr);
-					return;
-				}
-
-				/* Length: 16 "SPI=0xF1234567 )" */
-				sb_add(m, "SPI=0x%x )", ntohl(eh->spi) );
-
-			}
-			return;
-		default:
-			/* Max length: 20 "Unknown Ext Hdr 255" */
-			sb_add(m, "Unknown Ext Hdr %u", currenthdr);
-			return;
-		}
-		if (logflags & IP6T_LOG_IPOPT)
-			sb_add(m, ") ");
-
-		currenthdr = hp->nexthdr;
-		ptr += hdrlen;
-	}
-
-	switch (currenthdr) {
-	case IPPROTO_TCP: {
-		struct tcphdr _tcph;
-		const struct tcphdr *th;
-
-		/* Max length: 10 "PROTO=TCP " */
-		sb_add(m, "PROTO=TCP ");
-
-		if (fragment)
-			break;
-
-		/* Max length: 25 "INCOMPLETE [65535 bytes] " */
-		th = skb_header_pointer(skb, ptr, sizeof(_tcph), &_tcph);
-		if (th == NULL) {
-			sb_add(m, "INCOMPLETE [%u bytes] ", skb->len - ptr);
-			return;
-		}
-
-		/* Max length: 20 "SPT=65535 DPT=65535 " */
-		sb_add(m, "SPT=%u DPT=%u ",
-		       ntohs(th->source), ntohs(th->dest));
-		/* Max length: 30 "SEQ=4294967295 ACK=4294967295 " */
-		if (logflags & IP6T_LOG_TCPSEQ)
-			sb_add(m, "SEQ=%u ACK=%u ",
-			       ntohl(th->seq), ntohl(th->ack_seq));
-		/* Max length: 13 "WINDOW=65535 " */
-		sb_add(m, "WINDOW=%u ", ntohs(th->window));
-		/* Max length: 9 "RES=0x3C " */
-		sb_add(m, "RES=0x%02x ", (u_int8_t)(ntohl(tcp_flag_word(th) & TCP_RESERVED_BITS) >> 22));
-		/* Max length: 32 "CWR ECE URG ACK PSH RST SYN FIN " */
-		if (th->cwr)
-			sb_add(m, "CWR ");
-		if (th->ece)
-			sb_add(m, "ECE ");
-		if (th->urg)
-			sb_add(m, "URG ");
-		if (th->ack)
-			sb_add(m, "ACK ");
-		if (th->psh)
-			sb_add(m, "PSH ");
-		if (th->rst)
-			sb_add(m, "RST ");
-		if (th->syn)
-			sb_add(m, "SYN ");
-		if (th->fin)
-			sb_add(m, "FIN ");
-		/* Max length: 11 "URGP=65535 " */
-		sb_add(m, "URGP=%u ", ntohs(th->urg_ptr));
-
-		if ((logflags & IP6T_LOG_TCPOPT) &&
-		    th->doff * 4 > sizeof(struct tcphdr)) {
-			u_int8_t _opt[60 - sizeof(struct tcphdr)];
-			const u_int8_t *op;
-			unsigned int i;
-			unsigned int optsize = th->doff * 4
-					       - sizeof(struct tcphdr);
-
-			op = skb_header_pointer(skb,
-						ptr + sizeof(struct tcphdr),
-						optsize, _opt);
-			if (op == NULL) {
-				sb_add(m, "OPT (TRUNCATED)");
-				return;
-			}
-
-			/* Max length: 127 "OPT (" 15*4*2chars ") " */
-			sb_add(m, "OPT (");
-			for (i =0; i < optsize; i++)
-				sb_add(m, "%02X", op[i]);
-			sb_add(m, ") ");
-		}
-		break;
-	}
-	case IPPROTO_UDP:
-	case IPPROTO_UDPLITE: {
-		struct udphdr _udph;
-		const struct udphdr *uh;
-
-		if (currenthdr == IPPROTO_UDP)
-			/* Max length: 10 "PROTO=UDP "     */
-			sb_add(m, "PROTO=UDP " );
-		else	/* Max length: 14 "PROTO=UDPLITE " */
-			sb_add(m, "PROTO=UDPLITE ");
-
-		if (fragment)
-			break;
-
-		/* Max length: 25 "INCOMPLETE [65535 bytes] " */
-		uh = skb_header_pointer(skb, ptr, sizeof(_udph), &_udph);
-		if (uh == NULL) {
-			sb_add(m, "INCOMPLETE [%u bytes] ", skb->len - ptr);
-			return;
-		}
-
-		/* Max length: 20 "SPT=65535 DPT=65535 " */
-		sb_add(m, "SPT=%u DPT=%u LEN=%u ",
-		       ntohs(uh->source), ntohs(uh->dest),
-		       ntohs(uh->len));
-		break;
-	}
-	case IPPROTO_ICMPV6: {
-		struct icmp6hdr _icmp6h;
-		const struct icmp6hdr *ic;
-
-		/* Max length: 13 "PROTO=ICMPv6 " */
-		sb_add(m, "PROTO=ICMPv6 ");
-
-		if (fragment)
-			break;
-
-		/* Max length: 25 "INCOMPLETE [65535 bytes] " */
-		ic = skb_header_pointer(skb, ptr, sizeof(_icmp6h), &_icmp6h);
-		if (ic == NULL) {
-			sb_add(m, "INCOMPLETE [%u bytes] ", skb->len - ptr);
-			return;
-		}
-
-		/* Max length: 18 "TYPE=255 CODE=255 " */
-		sb_add(m, "TYPE=%u CODE=%u ", ic->icmp6_type, ic->icmp6_code);
-
-		switch (ic->icmp6_type) {
-		case ICMPV6_ECHO_REQUEST:
-		case ICMPV6_ECHO_REPLY:
-			/* Max length: 19 "ID=65535 SEQ=65535 " */
-			sb_add(m, "ID=%u SEQ=%u ",
-				ntohs(ic->icmp6_identifier),
-				ntohs(ic->icmp6_sequence));
-			break;
-		case ICMPV6_MGM_QUERY:
-		case ICMPV6_MGM_REPORT:
-		case ICMPV6_MGM_REDUCTION:
-			break;
-
-		case ICMPV6_PARAMPROB:
-			/* Max length: 17 "POINTER=ffffffff " */
-			sb_add(m, "POINTER=%08x ", ntohl(ic->icmp6_pointer));
-			/* Fall through */
-		case ICMPV6_DEST_UNREACH:
-		case ICMPV6_PKT_TOOBIG:
-		case ICMPV6_TIME_EXCEED:
-			/* Max length: 3+maxlen */
-			if (recurse) {
-				sb_add(m, "[");
-				dump_packet(m, info, skb,
-					    ptr + sizeof(_icmp6h), 0);
-				sb_add(m, "] ");
-			}
-
-			/* Max length: 10 "MTU=65535 " */
-			if (ic->icmp6_type == ICMPV6_PKT_TOOBIG)
-				sb_add(m, "MTU=%u ", ntohl(ic->icmp6_mtu));
-		}
-		break;
-	}
-	/* Max length: 10 "PROTO=255 " */
-	default:
-		sb_add(m, "PROTO=%u ", currenthdr);
-	}
-
-	/* Max length: 15 "UID=4294967295 " */
-	if ((logflags & IP6T_LOG_UID) && recurse && skb->sk) {
-		read_lock_bh(&skb->sk->sk_callback_lock);
-		if (skb->sk->sk_socket && skb->sk->sk_socket->file)
-			sb_add(m, "UID=%u GID=%u ",
-				skb->sk->sk_socket->file->f_cred->fsuid,
-				skb->sk->sk_socket->file->f_cred->fsgid);
-		read_unlock_bh(&skb->sk->sk_callback_lock);
-	}
-
-	/* Max length: 16 "MARK=0xFFFFFFFF " */
-	if (!recurse && skb->mark)
-		sb_add(m, "MARK=0x%x ", skb->mark);
-}
-
-static void dump_mac_header(struct sbuff *m,
-			    const struct nf_loginfo *info,
-			    const struct sk_buff *skb)
-{
-	struct net_device *dev = skb->dev;
-	unsigned int logflags = 0;
-
-	if (info->type == NF_LOG_TYPE_LOG)
-		logflags = info->u.log.logflags;
-
-	if (!(logflags & IP6T_LOG_MACDECODE))
-		goto fallback;
-
-	switch (dev->type) {
-	case ARPHRD_ETHER:
-		sb_add(m, "MACSRC=%pM MACDST=%pM MACPROTO=%04x ",
-		       eth_hdr(skb)->h_source, eth_hdr(skb)->h_dest,
-		       ntohs(eth_hdr(skb)->h_proto));
-		return;
-	default:
-		break;
-	}
-
-fallback:
-	sb_add(m, "MAC=");
-	if (dev->hard_header_len &&
-	    skb->mac_header != skb->network_header) {
-		const unsigned char *p = skb_mac_header(skb);
-		unsigned int len = dev->hard_header_len;
-		unsigned int i;
-
-		if (dev->type == ARPHRD_SIT &&
-		    (p -= ETH_HLEN) < skb->head)
-			p = NULL;
-
-		if (p != NULL) {
-			sb_add(m, "%02x", *p++);
-			for (i = 1; i < len; i++)
-				sb_add(m, ":%02x", *p++);
-		}
-		sb_add(m, " ");
-
-		if (dev->type == ARPHRD_SIT) {
-			const struct iphdr *iph =
-				(struct iphdr *)skb_mac_header(skb);
-			sb_add(m, "TUNNEL=%pI4->%pI4 ", &iph->saddr, &iph->daddr);
-		}
-	} else
-		sb_add(m, " ");
-}
-
-static struct nf_loginfo default_loginfo = {
-	.type	= NF_LOG_TYPE_LOG,
-	.u = {
-		.log = {
-			.level	  = 5,
-			.logflags = NF_LOG_MASK,
-		},
-	},
-};
-
-static void
-ip6t_log_packet(u_int8_t pf,
-		unsigned int hooknum,
-		const struct sk_buff *skb,
-		const struct net_device *in,
-		const struct net_device *out,
-		const struct nf_loginfo *loginfo,
-		const char *prefix)
-{
-	struct sbuff *m = sb_open();
-
-	if (!loginfo)
-		loginfo = &default_loginfo;
-
-	sb_add(m, "<%d>%sIN=%s OUT=%s ", loginfo->u.log.level,
-	       prefix,
-	       in ? in->name : "",
-	       out ? out->name : "");
-
-	if (in != NULL)
-		dump_mac_header(m, loginfo, skb);
-
-	dump_packet(m, loginfo, skb, skb_network_offset(skb), 1);
-
-	sb_close(m);
-}
-
-static unsigned int
-log_tg6(struct sk_buff *skb, const struct xt_action_param *par)
-{
-	const struct ip6t_log_info *loginfo = par->targinfo;
-	struct nf_loginfo li;
-
-	li.type = NF_LOG_TYPE_LOG;
-	li.u.log.level = loginfo->level;
-	li.u.log.logflags = loginfo->logflags;
-
-	ip6t_log_packet(NFPROTO_IPV6, par->hooknum, skb, par->in, par->out,
-			&li, loginfo->prefix);
-	return XT_CONTINUE;
-}
-
-
-static int log_tg6_check(const struct xt_tgchk_param *par)
-{
-	const struct ip6t_log_info *loginfo = par->targinfo;
-
-	if (loginfo->level >= 8) {
-		pr_debug("level %u >= 8\n", loginfo->level);
-		return -EINVAL;
-	}
-	if (loginfo->prefix[sizeof(loginfo->prefix)-1] != '\0') {
-		pr_debug("prefix not null-terminated\n");
-		return -EINVAL;
-	}
-	return 0;
-}
-
-static struct xt_target log_tg6_reg __read_mostly = {
-	.name 		= "LOG",
-	.family		= NFPROTO_IPV6,
-	.target 	= log_tg6,
-	.targetsize	= sizeof(struct ip6t_log_info),
-	.checkentry	= log_tg6_check,
-	.me 		= THIS_MODULE,
-};
-
-static struct nf_logger ip6t_logger __read_mostly = {
-	.name		= "ip6t_LOG",
-	.logfn		= &ip6t_log_packet,
-	.me		= THIS_MODULE,
-};
-
-static int __init log_tg6_init(void)
-{
-	int ret;
-
-	ret = xt_register_target(&log_tg6_reg);
-	if (ret < 0)
-		return ret;
-	nf_log_register(NFPROTO_IPV6, &ip6t_logger);
-	return 0;
-}
-
-static void __exit log_tg6_exit(void)
-{
-	nf_log_unregister(&ip6t_logger);
-	xt_unregister_target(&log_tg6_reg);
-}
-
-module_init(log_tg6_init);
-module_exit(log_tg6_exit);
diff --git a/net/netfilter/Kconfig b/net/netfilter/Kconfig
index f8ac4ef..b895d8b 100644
--- a/net/netfilter/Kconfig
+++ b/net/netfilter/Kconfig
@@ -524,6 +524,15 @@ config NETFILTER_XT_TARGET_LED
 	  For more information on the LEDs available on your system, see
 	  Documentation/leds/leds-class.txt
 
+config NETFILTER_XT_TARGET_LOG
+	tristate "LOG target support"
+	default m if NETFILTER_ADVANCED=n
+	help
+	  This option adds a `LOG' target, which allows you to create rules in
+	  any iptables table which records the packet header to the syslog.
+
+	  To compile it as a module, choose M here.  If unsure, say N.
+
 config NETFILTER_XT_TARGET_MARK
 	tristate '"MARK" target support'
 	depends on NETFILTER_ADVANCED
diff --git a/net/netfilter/Makefile b/net/netfilter/Makefile
index 40f4c3d..a28c2a6 100644
--- a/net/netfilter/Makefile
+++ b/net/netfilter/Makefile
@@ -58,6 +58,7 @@ obj-$(CONFIG_NETFILTER_XT_TARGET_CT) += xt_CT.o
 obj-$(CONFIG_NETFILTER_XT_TARGET_DSCP) += xt_DSCP.o
 obj-$(CONFIG_NETFILTER_XT_TARGET_HL) += xt_HL.o
 obj-$(CONFIG_NETFILTER_XT_TARGET_LED) += xt_LED.o
+obj-$(CONFIG_NETFILTER_XT_TARGET_LOG) += xt_LOG.o
 obj-$(CONFIG_NETFILTER_XT_TARGET_NFLOG) += xt_NFLOG.o
 obj-$(CONFIG_NETFILTER_XT_TARGET_NFQUEUE) += xt_NFQUEUE.o
 obj-$(CONFIG_NETFILTER_XT_TARGET_NOTRACK) += xt_NOTRACK.o
diff --git a/net/netfilter/xt_LOG.c b/net/netfilter/xt_LOG.c
new file mode 100644
index 0000000..baa084e
--- /dev/null
+++ b/net/netfilter/xt_LOG.c
@@ -0,0 +1,921 @@
+/*
+ * This is a module which is used for logging packets.
+ */
+
+/* (C) 1999-2001 Paul `Rusty' Russell
+ * (C) 2002-2004 Netfilter Core Team <coreteam@netfilter.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+#include <linux/module.h>
+#include <linux/spinlock.h>
+#include <linux/skbuff.h>
+#include <linux/if_arp.h>
+#include <linux/ip.h>
+#include <net/ipv6.h>
+#include <net/icmp.h>
+#include <net/udp.h>
+#include <net/tcp.h>
+#include <net/route.h>
+
+#include <linux/netfilter.h>
+#include <linux/netfilter/x_tables.h>
+#include <linux/netfilter/xt_LOG.h>
+#include <linux/netfilter_ipv6/ip6_tables.h>
+#include <net/netfilter/nf_log.h>
+#include <net/netfilter/xt_log.h>
+
+static struct nf_loginfo default_loginfo = {
+	.type	= NF_LOG_TYPE_LOG,
+	.u = {
+		.log = {
+			.level    = 5,
+			.logflags = NF_LOG_MASK,
+		},
+	},
+};
+
+static int dump_udp_header(struct sbuff *m, const struct sk_buff *skb,
+			   u8 proto, int fragment, unsigned int offset)
+{
+	struct udphdr _udph;
+	const struct udphdr *uh;
+
+	if (proto == IPPROTO_UDP)
+		/* Max length: 10 "PROTO=UDP "     */
+		sb_add(m, "PROTO=UDP ");
+	else	/* Max length: 14 "PROTO=UDPLITE " */
+		sb_add(m, "PROTO=UDPLITE ");
+
+	if (fragment)
+		goto out;
+
+	/* Max length: 25 "INCOMPLETE [65535 bytes] " */
+	uh = skb_header_pointer(skb, offset, sizeof(_udph), &_udph);
+	if (uh == NULL) {
+		sb_add(m, "INCOMPLETE [%u bytes] ", skb->len - offset);
+
+		return 1;
+	}
+
+	/* Max length: 20 "SPT=65535 DPT=65535 " */
+	sb_add(m, "SPT=%u DPT=%u LEN=%u ", ntohs(uh->source), ntohs(uh->dest),
+		ntohs(uh->len));
+
+out:
+	return 0;
+}
+
+static int dump_tcp_header(struct sbuff *m, const struct sk_buff *skb,
+			   u8 proto, int fragment, unsigned int offset,
+			   unsigned int logflags)
+{
+	struct tcphdr _tcph;
+	const struct tcphdr *th;
+
+	/* Max length: 10 "PROTO=TCP " */
+	sb_add(m, "PROTO=TCP ");
+
+	if (fragment)
+		return 0;
+
+	/* Max length: 25 "INCOMPLETE [65535 bytes] " */
+	th = skb_header_pointer(skb, offset, sizeof(_tcph), &_tcph);
+	if (th == NULL) {
+		sb_add(m, "INCOMPLETE [%u bytes] ", skb->len - offset);
+		return 1;
+	}
+
+	/* Max length: 20 "SPT=65535 DPT=65535 " */
+	sb_add(m, "SPT=%u DPT=%u ", ntohs(th->source), ntohs(th->dest));
+	/* Max length: 30 "SEQ=4294967295 ACK=4294967295 " */
+	if (logflags & XT_LOG_TCPSEQ)
+		sb_add(m, "SEQ=%u ACK=%u ", ntohl(th->seq), ntohl(th->ack_seq));
+
+	/* Max length: 13 "WINDOW=65535 " */
+	sb_add(m, "WINDOW=%u ", ntohs(th->window));
+	/* Max length: 9 "RES=0x3C " */
+	sb_add(m, "RES=0x%02x ", (u_int8_t)(ntohl(tcp_flag_word(th) &
+					    TCP_RESERVED_BITS) >> 22));
+	/* Max length: 32 "CWR ECE URG ACK PSH RST SYN FIN " */
+	if (th->cwr)
+		sb_add(m, "CWR ");
+	if (th->ece)
+		sb_add(m, "ECE ");
+	if (th->urg)
+		sb_add(m, "URG ");
+	if (th->ack)
+		sb_add(m, "ACK ");
+	if (th->psh)
+		sb_add(m, "PSH ");
+	if (th->rst)
+		sb_add(m, "RST ");
+	if (th->syn)
+		sb_add(m, "SYN ");
+	if (th->fin)
+		sb_add(m, "FIN ");
+	/* Max length: 11 "URGP=65535 " */
+	sb_add(m, "URGP=%u ", ntohs(th->urg_ptr));
+
+	if ((logflags & XT_LOG_TCPOPT) && th->doff*4 > sizeof(struct tcphdr)) {
+		u_int8_t _opt[60 - sizeof(struct tcphdr)];
+		const u_int8_t *op;
+		unsigned int i;
+		unsigned int optsize = th->doff*4 - sizeof(struct tcphdr);
+
+		op = skb_header_pointer(skb, offset + sizeof(struct tcphdr),
+					optsize, _opt);
+		if (op == NULL) {
+			sb_add(m, "OPT (TRUNCATED)");
+			return 1;
+		}
+
+		/* Max length: 127 "OPT (" 15*4*2chars ") " */
+		sb_add(m, "OPT (");
+		for (i = 0; i < optsize; i++)
+			sb_add(m, "%02X", op[i]);
+
+		sb_add(m, ") ");
+	}
+
+	return 0;
+}
+
+/* One level of recursion won't kill us */
+static void dump_ipv4_packet(struct sbuff *m,
+			const struct nf_loginfo *info,
+			const struct sk_buff *skb,
+			unsigned int iphoff)
+{
+	struct iphdr _iph;
+	const struct iphdr *ih;
+	unsigned int logflags;
+
+	if (info->type == NF_LOG_TYPE_LOG)
+		logflags = info->u.log.logflags;
+	else
+		logflags = NF_LOG_MASK;
+
+	ih = skb_header_pointer(skb, iphoff, sizeof(_iph), &_iph);
+	if (ih == NULL) {
+		sb_add(m, "TRUNCATED");
+		return;
+	}
+
+	/* Important fields:
+	 * TOS, len, DF/MF, fragment offset, TTL, src, dst, options. */
+	/* Max length: 40 "SRC=255.255.255.255 DST=255.255.255.255 " */
+	sb_add(m, "SRC=%pI4 DST=%pI4 ",
+	       &ih->saddr, &ih->daddr);
+
+	/* Max length: 46 "LEN=65535 TOS=0xFF PREC=0xFF TTL=255 ID=65535 " */
+	sb_add(m, "LEN=%u TOS=0x%02X PREC=0x%02X TTL=%u ID=%u ",
+	       ntohs(ih->tot_len), ih->tos & IPTOS_TOS_MASK,
+	       ih->tos & IPTOS_PREC_MASK, ih->ttl, ntohs(ih->id));
+
+	/* Max length: 6 "CE DF MF " */
+	if (ntohs(ih->frag_off) & IP_CE)
+		sb_add(m, "CE ");
+	if (ntohs(ih->frag_off) & IP_DF)
+		sb_add(m, "DF ");
+	if (ntohs(ih->frag_off) & IP_MF)
+		sb_add(m, "MF ");
+
+	/* Max length: 11 "FRAG:65535 " */
+	if (ntohs(ih->frag_off) & IP_OFFSET)
+		sb_add(m, "FRAG:%u ", ntohs(ih->frag_off) & IP_OFFSET);
+
+	if ((logflags & XT_LOG_IPOPT) &&
+	    ih->ihl * 4 > sizeof(struct iphdr)) {
+		const unsigned char *op;
+		unsigned char _opt[4 * 15 - sizeof(struct iphdr)];
+		unsigned int i, optsize;
+
+		optsize = ih->ihl * 4 - sizeof(struct iphdr);
+		op = skb_header_pointer(skb, iphoff+sizeof(_iph),
+					optsize, _opt);
+		if (op == NULL) {
+			sb_add(m, "TRUNCATED");
+			return;
+		}
+
+		/* Max length: 127 "OPT (" 15*4*2chars ") " */
+		sb_add(m, "OPT (");
+		for (i = 0; i < optsize; i++)
+			sb_add(m, "%02X", op[i]);
+		sb_add(m, ") ");
+	}
+
+	switch (ih->protocol) {
+	case IPPROTO_TCP:
+		if (dump_tcp_header(m, skb, ih->protocol,
+				    ntohs(ih->frag_off) & IP_OFFSET,
+				    iphoff+ih->ihl*4, logflags))
+			return;
+	case IPPROTO_UDP:
+	case IPPROTO_UDPLITE:
+		if (dump_udp_header(m, skb, ih->protocol,
+				    ntohs(ih->frag_off) & IP_OFFSET,
+				    iphoff+ih->ihl*4))
+			return;
+	case IPPROTO_ICMP: {
+		struct icmphdr _icmph;
+		const struct icmphdr *ich;
+		static const size_t required_len[NR_ICMP_TYPES+1]
+			= { [ICMP_ECHOREPLY] = 4,
+			    [ICMP_DEST_UNREACH]
+			    = 8 + sizeof(struct iphdr),
+			    [ICMP_SOURCE_QUENCH]
+			    = 8 + sizeof(struct iphdr),
+			    [ICMP_REDIRECT]
+			    = 8 + sizeof(struct iphdr),
+			    [ICMP_ECHO] = 4,
+			    [ICMP_TIME_EXCEEDED]
+			    = 8 + sizeof(struct iphdr),
+			    [ICMP_PARAMETERPROB]
+			    = 8 + sizeof(struct iphdr),
+			    [ICMP_TIMESTAMP] = 20,
+			    [ICMP_TIMESTAMPREPLY] = 20,
+			    [ICMP_ADDRESS] = 12,
+			    [ICMP_ADDRESSREPLY] = 12 };
+
+		/* Max length: 11 "PROTO=ICMP " */
+		sb_add(m, "PROTO=ICMP ");
+
+		if (ntohs(ih->frag_off) & IP_OFFSET)
+			break;
+
+		/* Max length: 25 "INCOMPLETE [65535 bytes] " */
+		ich = skb_header_pointer(skb, iphoff + ih->ihl * 4,
+					 sizeof(_icmph), &_icmph);
+		if (ich == NULL) {
+			sb_add(m, "INCOMPLETE [%u bytes] ",
+			       skb->len - iphoff - ih->ihl*4);
+			break;
+		}
+
+		/* Max length: 18 "TYPE=255 CODE=255 " */
+		sb_add(m, "TYPE=%u CODE=%u ", ich->type, ich->code);
+
+		/* Max length: 25 "INCOMPLETE [65535 bytes] " */
+		if (ich->type <= NR_ICMP_TYPES &&
+		    required_len[ich->type] &&
+		    skb->len-iphoff-ih->ihl*4 < required_len[ich->type]) {
+			sb_add(m, "INCOMPLETE [%u bytes] ",
+			       skb->len - iphoff - ih->ihl*4);
+			break;
+		}
+
+		switch (ich->type) {
+		case ICMP_ECHOREPLY:
+		case ICMP_ECHO:
+			/* Max length: 19 "ID=65535 SEQ=65535 " */
+			sb_add(m, "ID=%u SEQ=%u ",
+			       ntohs(ich->un.echo.id),
+			       ntohs(ich->un.echo.sequence));
+			break;
+
+		case ICMP_PARAMETERPROB:
+			/* Max length: 14 "PARAMETER=255 " */
+			sb_add(m, "PARAMETER=%u ",
+			       ntohl(ich->un.gateway) >> 24);
+			break;
+		case ICMP_REDIRECT:
+			/* Max length: 24 "GATEWAY=255.255.255.255 " */
+			sb_add(m, "GATEWAY=%pI4 ", &ich->un.gateway);
+			/* Fall through */
+		case ICMP_DEST_UNREACH:
+		case ICMP_SOURCE_QUENCH:
+		case ICMP_TIME_EXCEEDED:
+			/* Max length: 3+maxlen */
+			if (!iphoff) { /* Only recurse once. */
+				sb_add(m, "[");
+				dump_ipv4_packet(m, info, skb,
+					    iphoff + ih->ihl*4+sizeof(_icmph));
+				sb_add(m, "] ");
+			}
+
+			/* Max length: 10 "MTU=65535 " */
+			if (ich->type == ICMP_DEST_UNREACH &&
+			    ich->code == ICMP_FRAG_NEEDED)
+				sb_add(m, "MTU=%u ", ntohs(ich->un.frag.mtu));
+		}
+		break;
+	}
+	/* Max Length */
+	case IPPROTO_AH: {
+		struct ip_auth_hdr _ahdr;
+		const struct ip_auth_hdr *ah;
+
+		if (ntohs(ih->frag_off) & IP_OFFSET)
+			break;
+
+		/* Max length: 9 "PROTO=AH " */
+		sb_add(m, "PROTO=AH ");
+
+		/* Max length: 25 "INCOMPLETE [65535 bytes] " */
+		ah = skb_header_pointer(skb, iphoff+ih->ihl*4,
+					sizeof(_ahdr), &_ahdr);
+		if (ah == NULL) {
+			sb_add(m, "INCOMPLETE [%u bytes] ",
+			       skb->len - iphoff - ih->ihl*4);
+			break;
+		}
+
+		/* Length: 15 "SPI=0xF1234567 " */
+		sb_add(m, "SPI=0x%x ", ntohl(ah->spi));
+		break;
+	}
+	case IPPROTO_ESP: {
+		struct ip_esp_hdr _esph;
+		const struct ip_esp_hdr *eh;
+
+		/* Max length: 10 "PROTO=ESP " */
+		sb_add(m, "PROTO=ESP ");
+
+		if (ntohs(ih->frag_off) & IP_OFFSET)
+			break;
+
+		/* Max length: 25 "INCOMPLETE [65535 bytes] " */
+		eh = skb_header_pointer(skb, iphoff+ih->ihl*4,
+					sizeof(_esph), &_esph);
+		if (eh == NULL) {
+			sb_add(m, "INCOMPLETE [%u bytes] ",
+			       skb->len - iphoff - ih->ihl*4);
+			break;
+		}
+
+		/* Length: 15 "SPI=0xF1234567 " */
+		sb_add(m, "SPI=0x%x ", ntohl(eh->spi));
+		break;
+	}
+	/* Max length: 10 "PROTO 255 " */
+	default:
+		sb_add(m, "PROTO=%u ", ih->protocol);
+	}
+
+	/* Max length: 15 "UID=4294967295 " */
+	if ((logflags & XT_LOG_UID) && !iphoff && skb->sk) {
+		read_lock_bh(&skb->sk->sk_callback_lock);
+		if (skb->sk->sk_socket && skb->sk->sk_socket->file)
+			sb_add(m, "UID=%u GID=%u ",
+				skb->sk->sk_socket->file->f_cred->fsuid,
+				skb->sk->sk_socket->file->f_cred->fsgid);
+		read_unlock_bh(&skb->sk->sk_callback_lock);
+	}
+
+	/* Max length: 16 "MARK=0xFFFFFFFF " */
+	if (!iphoff && skb->mark)
+		sb_add(m, "MARK=0x%x ", skb->mark);
+
+	/* Proto    Max log string length */
+	/* IP:      40+46+6+11+127 = 230 */
+	/* TCP:     10+max(25,20+30+13+9+32+11+127) = 252 */
+	/* UDP:     10+max(25,20) = 35 */
+	/* UDPLITE: 14+max(25,20) = 39 */
+	/* ICMP:    11+max(25, 18+25+max(19,14,24+3+n+10,3+n+10)) = 91+n */
+	/* ESP:     10+max(25)+15 = 50 */
+	/* AH:      9+max(25)+15 = 49 */
+	/* unknown: 10 */
+
+	/* (ICMP allows recursion one level deep) */
+	/* maxlen =  IP + ICMP +  IP + max(TCP,UDP,ICMP,unknown) */
+	/* maxlen = 230+   91  + 230 + 252 = 803 */
+}
+
+static void dump_ipv4_mac_header(struct sbuff *m,
+			    const struct nf_loginfo *info,
+			    const struct sk_buff *skb)
+{
+	struct net_device *dev = skb->dev;
+	unsigned int logflags = 0;
+
+	if (info->type == NF_LOG_TYPE_LOG)
+		logflags = info->u.log.logflags;
+
+	if (!(logflags & XT_LOG_MACDECODE))
+		goto fallback;
+
+	switch (dev->type) {
+	case ARPHRD_ETHER:
+		sb_add(m, "MACSRC=%pM MACDST=%pM MACPROTO=%04x ",
+		       eth_hdr(skb)->h_source, eth_hdr(skb)->h_dest,
+		       ntohs(eth_hdr(skb)->h_proto));
+		return;
+	default:
+		break;
+	}
+
+fallback:
+	sb_add(m, "MAC=");
+	if (dev->hard_header_len &&
+	    skb->mac_header != skb->network_header) {
+		const unsigned char *p = skb_mac_header(skb);
+		unsigned int i;
+
+		sb_add(m, "%02x", *p++);
+		for (i = 1; i < dev->hard_header_len; i++, p++)
+			sb_add(m, ":%02x", *p);
+	}
+	sb_add(m, " ");
+}
+
+static void
+log_packet_common(struct sbuff *m,
+		  u_int8_t pf,
+		  unsigned int hooknum,
+		  const struct sk_buff *skb,
+		  const struct net_device *in,
+		  const struct net_device *out,
+		  const struct nf_loginfo *loginfo,
+		  const char *prefix)
+{
+	sb_add(m, "<%d>%sIN=%s OUT=%s ", loginfo->u.log.level,
+	       prefix,
+	       in ? in->name : "",
+	       out ? out->name : "");
+#ifdef CONFIG_BRIDGE_NETFILTER
+	if (skb->nf_bridge) {
+		const struct net_device *physindev;
+		const struct net_device *physoutdev;
+
+		physindev = skb->nf_bridge->physindev;
+		if (physindev && in != physindev)
+			sb_add(m, "PHYSIN=%s ", physindev->name);
+		physoutdev = skb->nf_bridge->physoutdev;
+		if (physoutdev && out != physoutdev)
+			sb_add(m, "PHYSOUT=%s ", physoutdev->name);
+	}
+#endif
+}
+
+
+static void
+ipt_log_packet(u_int8_t pf,
+	       unsigned int hooknum,
+	       const struct sk_buff *skb,
+	       const struct net_device *in,
+	       const struct net_device *out,
+	       const struct nf_loginfo *loginfo,
+	       const char *prefix)
+{
+	struct sbuff *m = sb_open();
+
+	if (!loginfo)
+		loginfo = &default_loginfo;
+
+	log_packet_common(m, pf, hooknum, skb, in, out, loginfo, prefix);
+
+	if (in != NULL)
+		dump_ipv4_mac_header(m, loginfo, skb);
+
+	dump_ipv4_packet(m, loginfo, skb, 0);
+
+	sb_close(m);
+}
+
+#if IS_ENABLED(CONFIG_IPV6)
+/* One level of recursion won't kill us */
+static void dump_ipv6_packet(struct sbuff *m,
+			const struct nf_loginfo *info,
+			const struct sk_buff *skb, unsigned int ip6hoff,
+			int recurse)
+{
+	u_int8_t currenthdr;
+	int fragment;
+	struct ipv6hdr _ip6h;
+	const struct ipv6hdr *ih;
+	unsigned int ptr;
+	unsigned int hdrlen = 0;
+	unsigned int logflags;
+
+	if (info->type == NF_LOG_TYPE_LOG)
+		logflags = info->u.log.logflags;
+	else
+		logflags = NF_LOG_MASK;
+
+	ih = skb_header_pointer(skb, ip6hoff, sizeof(_ip6h), &_ip6h);
+	if (ih == NULL) {
+		sb_add(m, "TRUNCATED");
+		return;
+	}
+
+	/* Max length: 88 "SRC=0000.0000.0000.0000.0000.0000.0000.0000 DST=0000.0000.0000.0000.0000.0000.0000.0000 " */
+	sb_add(m, "SRC=%pI6 DST=%pI6 ", &ih->saddr, &ih->daddr);
+
+	/* Max length: 44 "LEN=65535 TC=255 HOPLIMIT=255 FLOWLBL=FFFFF " */
+	sb_add(m, "LEN=%Zu TC=%u HOPLIMIT=%u FLOWLBL=%u ",
+	       ntohs(ih->payload_len) + sizeof(struct ipv6hdr),
+	       (ntohl(*(__be32 *)ih) & 0x0ff00000) >> 20,
+	       ih->hop_limit,
+	       (ntohl(*(__be32 *)ih) & 0x000fffff));
+
+	fragment = 0;
+	ptr = ip6hoff + sizeof(struct ipv6hdr);
+	currenthdr = ih->nexthdr;
+	while (currenthdr != NEXTHDR_NONE && ip6t_ext_hdr(currenthdr)) {
+		struct ipv6_opt_hdr _hdr;
+		const struct ipv6_opt_hdr *hp;
+
+		hp = skb_header_pointer(skb, ptr, sizeof(_hdr), &_hdr);
+		if (hp == NULL) {
+			sb_add(m, "TRUNCATED");
+			return;
+		}
+
+		/* Max length: 48 "OPT (...) " */
+		if (logflags & XT_LOG_IPOPT)
+			sb_add(m, "OPT ( ");
+
+		switch (currenthdr) {
+		case IPPROTO_FRAGMENT: {
+			struct frag_hdr _fhdr;
+			const struct frag_hdr *fh;
+
+			sb_add(m, "FRAG:");
+			fh = skb_header_pointer(skb, ptr, sizeof(_fhdr),
+						&_fhdr);
+			if (fh == NULL) {
+				sb_add(m, "TRUNCATED ");
+				return;
+			}
+
+			/* Max length: 6 "65535 " */
+			sb_add(m, "%u ", ntohs(fh->frag_off) & 0xFFF8);
+
+			/* Max length: 11 "INCOMPLETE " */
+			if (fh->frag_off & htons(0x0001))
+				sb_add(m, "INCOMPLETE ");
+
+			sb_add(m, "ID:%08x ", ntohl(fh->identification));
+
+			if (ntohs(fh->frag_off) & 0xFFF8)
+				fragment = 1;
+
+			hdrlen = 8;
+
+			break;
+		}
+		case IPPROTO_DSTOPTS:
+		case IPPROTO_ROUTING:
+		case IPPROTO_HOPOPTS:
+			if (fragment) {
+				if (logflags & XT_LOG_IPOPT)
+					sb_add(m, ")");
+				return;
+			}
+			hdrlen = ipv6_optlen(hp);
+			break;
+		/* Max Length */
+		case IPPROTO_AH:
+			if (logflags & XT_LOG_IPOPT) {
+				struct ip_auth_hdr _ahdr;
+				const struct ip_auth_hdr *ah;
+
+				/* Max length: 3 "AH " */
+				sb_add(m, "AH ");
+
+				if (fragment) {
+					sb_add(m, ")");
+					return;
+				}
+
+				ah = skb_header_pointer(skb, ptr, sizeof(_ahdr),
+							&_ahdr);
+				if (ah == NULL) {
+					/*
+					 * Max length: 26 "INCOMPLETE [65535
+					 *  bytes] )"
+					 */
+					sb_add(m, "INCOMPLETE [%u bytes] )",
+					       skb->len - ptr);
+					return;
+				}
+
+				/* Length: 15 "SPI=0xF1234567 */
+				sb_add(m, "SPI=0x%x ", ntohl(ah->spi));
+
+			}
+
+			hdrlen = (hp->hdrlen+2)<<2;
+			break;
+		case IPPROTO_ESP:
+			if (logflags & XT_LOG_IPOPT) {
+				struct ip_esp_hdr _esph;
+				const struct ip_esp_hdr *eh;
+
+				/* Max length: 4 "ESP " */
+				sb_add(m, "ESP ");
+
+				if (fragment) {
+					sb_add(m, ")");
+					return;
+				}
+
+				/*
+				 * Max length: 26 "INCOMPLETE [65535 bytes] )"
+				 */
+				eh = skb_header_pointer(skb, ptr, sizeof(_esph),
+							&_esph);
+				if (eh == NULL) {
+					sb_add(m, "INCOMPLETE [%u bytes] )",
+					       skb->len - ptr);
+					return;
+				}
+
+				/* Length: 16 "SPI=0xF1234567 )" */
+				sb_add(m, "SPI=0x%x )", ntohl(eh->spi));
+
+			}
+			return;
+		default:
+			/* Max length: 20 "Unknown Ext Hdr 255" */
+			sb_add(m, "Unknown Ext Hdr %u", currenthdr);
+			return;
+		}
+		if (logflags & XT_LOG_IPOPT)
+			sb_add(m, ") ");
+
+		currenthdr = hp->nexthdr;
+		ptr += hdrlen;
+	}
+
+	switch (currenthdr) {
+	case IPPROTO_TCP:
+		if (dump_tcp_header(m, skb, currenthdr, fragment, ptr,
+		    logflags))
+			return;
+	case IPPROTO_UDP:
+	case IPPROTO_UDPLITE:
+		if (dump_udp_header(m, skb, currenthdr, fragment, ptr))
+			return;
+	case IPPROTO_ICMPV6: {
+		struct icmp6hdr _icmp6h;
+		const struct icmp6hdr *ic;
+
+		/* Max length: 13 "PROTO=ICMPv6 " */
+		sb_add(m, "PROTO=ICMPv6 ");
+
+		if (fragment)
+			break;
+
+		/* Max length: 25 "INCOMPLETE [65535 bytes] " */
+		ic = skb_header_pointer(skb, ptr, sizeof(_icmp6h), &_icmp6h);
+		if (ic == NULL) {
+			sb_add(m, "INCOMPLETE [%u bytes] ", skb->len - ptr);
+			return;
+		}
+
+		/* Max length: 18 "TYPE=255 CODE=255 " */
+		sb_add(m, "TYPE=%u CODE=%u ", ic->icmp6_type, ic->icmp6_code);
+
+		switch (ic->icmp6_type) {
+		case ICMPV6_ECHO_REQUEST:
+		case ICMPV6_ECHO_REPLY:
+			/* Max length: 19 "ID=65535 SEQ=65535 " */
+			sb_add(m, "ID=%u SEQ=%u ",
+				ntohs(ic->icmp6_identifier),
+				ntohs(ic->icmp6_sequence));
+			break;
+		case ICMPV6_MGM_QUERY:
+		case ICMPV6_MGM_REPORT:
+		case ICMPV6_MGM_REDUCTION:
+			break;
+
+		case ICMPV6_PARAMPROB:
+			/* Max length: 17 "POINTER=ffffffff " */
+			sb_add(m, "POINTER=%08x ", ntohl(ic->icmp6_pointer));
+			/* Fall through */
+		case ICMPV6_DEST_UNREACH:
+		case ICMPV6_PKT_TOOBIG:
+		case ICMPV6_TIME_EXCEED:
+			/* Max length: 3+maxlen */
+			if (recurse) {
+				sb_add(m, "[");
+				dump_ipv6_packet(m, info, skb,
+					    ptr + sizeof(_icmp6h), 0);
+				sb_add(m, "] ");
+			}
+
+			/* Max length: 10 "MTU=65535 " */
+			if (ic->icmp6_type == ICMPV6_PKT_TOOBIG)
+				sb_add(m, "MTU=%u ", ntohl(ic->icmp6_mtu));
+		}
+		break;
+	}
+	/* Max length: 10 "PROTO=255 " */
+	default:
+		sb_add(m, "PROTO=%u ", currenthdr);
+	}
+
+	/* Max length: 15 "UID=4294967295 " */
+	if ((logflags & XT_LOG_UID) && recurse && skb->sk) {
+		read_lock_bh(&skb->sk->sk_callback_lock);
+		if (skb->sk->sk_socket && skb->sk->sk_socket->file)
+			sb_add(m, "UID=%u GID=%u ",
+				skb->sk->sk_socket->file->f_cred->fsuid,
+				skb->sk->sk_socket->file->f_cred->fsgid);
+		read_unlock_bh(&skb->sk->sk_callback_lock);
+	}
+
+	/* Max length: 16 "MARK=0xFFFFFFFF " */
+	if (!recurse && skb->mark)
+		sb_add(m, "MARK=0x%x ", skb->mark);
+}
+
+static void dump_ipv6_mac_header(struct sbuff *m,
+			    const struct nf_loginfo *info,
+			    const struct sk_buff *skb)
+{
+	struct net_device *dev = skb->dev;
+	unsigned int logflags = 0;
+
+	if (info->type == NF_LOG_TYPE_LOG)
+		logflags = info->u.log.logflags;
+
+	if (!(logflags & XT_LOG_MACDECODE))
+		goto fallback;
+
+	switch (dev->type) {
+	case ARPHRD_ETHER:
+		sb_add(m, "MACSRC=%pM MACDST=%pM MACPROTO=%04x ",
+		       eth_hdr(skb)->h_source, eth_hdr(skb)->h_dest,
+		       ntohs(eth_hdr(skb)->h_proto));
+		return;
+	default:
+		break;
+	}
+
+fallback:
+	sb_add(m, "MAC=");
+	if (dev->hard_header_len &&
+	    skb->mac_header != skb->network_header) {
+		const unsigned char *p = skb_mac_header(skb);
+		unsigned int len = dev->hard_header_len;
+		unsigned int i;
+
+		if (dev->type == ARPHRD_SIT) {
+			p -= ETH_HLEN;
+
+			if (p < skb->head)
+				p = NULL;
+		}
+
+		if (p != NULL) {
+			sb_add(m, "%02x", *p++);
+			for (i = 1; i < len; i++)
+				sb_add(m, ":%02x", *p++);
+		}
+		sb_add(m, " ");
+
+		if (dev->type == ARPHRD_SIT) {
+			const struct iphdr *iph =
+				(struct iphdr *)skb_mac_header(skb);
+			sb_add(m, "TUNNEL=%pI4->%pI4 ", &iph->saddr,
+			       &iph->daddr);
+		}
+	} else
+		sb_add(m, " ");
+}
+
+static void
+ip6t_log_packet(u_int8_t pf,
+		unsigned int hooknum,
+		const struct sk_buff *skb,
+		const struct net_device *in,
+		const struct net_device *out,
+		const struct nf_loginfo *loginfo,
+		const char *prefix)
+{
+	struct sbuff *m = sb_open();
+
+	if (!loginfo)
+		loginfo = &default_loginfo;
+
+	log_packet_common(m, pf, hooknum, skb, in, out, loginfo, prefix);
+
+	if (in != NULL)
+		dump_ipv6_mac_header(m, loginfo, skb);
+
+	dump_ipv6_packet(m, loginfo, skb, skb_network_offset(skb), 1);
+
+	sb_close(m);
+}
+#endif
+
+static unsigned int
+log_tg(struct sk_buff *skb, const struct xt_action_param *par)
+{
+	const struct xt_log_info *loginfo = par->targinfo;
+	struct nf_loginfo li;
+
+	li.type = NF_LOG_TYPE_LOG;
+	li.u.log.level = loginfo->level;
+	li.u.log.logflags = loginfo->logflags;
+
+	if (par->family == NFPROTO_IPV4)
+		ipt_log_packet(NFPROTO_IPV4, par->hooknum, skb, par->in,
+			       par->out, &li, loginfo->prefix);
+#if IS_ENABLED(CONFIG_IPV6)
+	else if (par->family == NFPROTO_IPV6)
+		ip6t_log_packet(NFPROTO_IPV6, par->hooknum, skb, par->in,
+				par->out, &li, loginfo->prefix);
+#endif
+	else
+		BUG();
+
+	return XT_CONTINUE;
+}
+
+static int log_tg_check(const struct xt_tgchk_param *par)
+{
+	const struct xt_log_info *loginfo = par->targinfo;
+
+	if (par->family != NFPROTO_IPV4 && par->family != NFPROTO_IPV6)
+		return -EINVAL;
+
+	if (loginfo->level >= 8) {
+		pr_debug("level %u >= 8\n", loginfo->level);
+		return -EINVAL;
+	}
+
+	if (loginfo->prefix[sizeof(loginfo->prefix)-1] != '\0') {
+		pr_debug("prefix is not null-terminated\n");
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static struct xt_target log_tg_regs[] __read_mostly = {
+	{
+		.name		= "LOG",
+		.family		= NFPROTO_IPV4,
+		.target		= log_tg,
+		.targetsize	= sizeof(struct xt_log_info),
+		.checkentry	= log_tg_check,
+		.me		= THIS_MODULE,
+	},
+#if IS_ENABLED(CONFIG_IPV6)
+	{
+		.name		= "LOG",
+		.family		= NFPROTO_IPV6,
+		.target		= log_tg,
+		.targetsize	= sizeof(struct xt_log_info),
+		.checkentry	= log_tg_check,
+		.me		= THIS_MODULE,
+	},
+#endif
+};
+
+static struct nf_logger ipt_log_logger __read_mostly = {
+	.name		= "ipt_LOG",
+	.logfn		= &ipt_log_packet,
+	.me		= THIS_MODULE,
+};
+
+#if IS_ENABLED(CONFIG_IPV6)
+static struct nf_logger ip6t_log_logger __read_mostly = {
+	.name		= "ip6t_LOG",
+	.logfn		= &ip6t_log_packet,
+	.me		= THIS_MODULE,
+};
+#endif
+
+static int __init log_tg_init(void)
+{
+	int ret;
+
+	ret = xt_register_targets(log_tg_regs, ARRAY_SIZE(log_tg_regs));
+	if (ret < 0)
+		return ret;
+
+	nf_log_register(NFPROTO_IPV4, &ipt_log_logger);
+#if IS_ENABLED(CONFIG_IPV6)
+	nf_log_register(NFPROTO_IPV6, &ip6t_log_logger);
+#endif
+	return 0;
+}
+
+static void __exit log_tg_exit(void)
+{
+	nf_log_unregister(&ipt_log_logger);
+#if IS_ENABLED(CONFIG_IPV6)
+	nf_log_unregister(&ip6t_log_logger);
+#endif
+	xt_unregister_targets(log_tg_regs, ARRAY_SIZE(log_tg_regs));
+}
+
+module_init(log_tg_init);
+module_exit(log_tg_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Netfilter Core Team <coreteam@netfilter.org>");
+MODULE_AUTHOR("Jan Rekorajski <baggins@pld.org.pl>");
+MODULE_DESCRIPTION("Xtables: IPv4/IPv6 packet logging");
+MODULE_ALIAS("ipt_LOG");
+MODULE_ALIAS("ip6t_LOG");
-- 
1.7.7


^ permalink raw reply related	[flat|nested] 15+ messages in thread

* Re: [PATCH 1/6] Netfilter: Merge ipt_LOG and ip6_LOG into xt_LOG
  2012-01-22 21:56 ` [PATCH 1/6] Netfilter: Merge ipt_LOG and ip6_LOG into xt_LOG Richard Weinberger
@ 2012-01-30  9:01   ` richard -rw- weinberger
  2012-02-01  1:24     ` Jan Engelhardt
  0 siblings, 1 reply; 15+ messages in thread
From: richard -rw- weinberger @ 2012-01-30  9:01 UTC (permalink / raw)
  To: netfilter-devel; +Cc: netdev, linux-kernel, eric.dumazet, jengelh

On Sun, Jan 22, 2012 at 10:56 PM, Richard Weinberger <richard@nod.at> wrote:
> ipt_LOG and ip6_LOG have a lot of common code, merge them
> to reduce duplicate code.
>
> Signed-off-by: Richard Weinberger <richard@nod.at>

No comments?

-- 
Thanks,
//richard

^ permalink raw reply	[flat|nested] 15+ messages in thread

* Re: [PATCH 1/6] Netfilter: Merge ipt_LOG and ip6_LOG into xt_LOG
  2012-01-30  9:01   ` richard -rw- weinberger
@ 2012-02-01  1:24     ` Jan Engelhardt
  2012-02-01  2:53       ` Pablo Neira Ayuso
  2012-02-01  9:14       ` richard -rw- weinberger
  0 siblings, 2 replies; 15+ messages in thread
From: Jan Engelhardt @ 2012-02-01  1:24 UTC (permalink / raw)
  To: richard -rw- weinberger
  Cc: Netfilter Developer Mailing List,
	Linux Networking Developer Mailing List,
	Linux Kernel Mailing List, eric.dumazet, Pablo Neira Ayuso

On Monday 2012-01-30 10:01, richard -rw- weinberger wrote:

>On Sun, Jan 22, 2012 at 10:56 PM, Richard Weinberger <richard@nod.at> wrote:
>> ipt_LOG and ip6_LOG have a lot of common code, merge them
>> to reduce duplicate code.
>>
>> Signed-off-by: Richard Weinberger <richard@nod.at>
>
>No comments?

Adding Pablo to Cc.


Do you have the patchset as a retrievable git tree, btw?


>[PATCH 6/6] iptables: xt_LOG: Add ring buffer support
>
>in libxt_LOG.c:
>+.size = XT_ALIGN(sizeof(struct xt_log_info_v1) + sizeof(void *)),

Why the extra void*?

^ permalink raw reply	[flat|nested] 15+ messages in thread

* Re: [PATCH 1/6] Netfilter: Merge ipt_LOG and ip6_LOG into xt_LOG
  2012-02-01  1:24     ` Jan Engelhardt
@ 2012-02-01  2:53       ` Pablo Neira Ayuso
  2012-02-01  9:14       ` richard -rw- weinberger
  1 sibling, 0 replies; 15+ messages in thread
From: Pablo Neira Ayuso @ 2012-02-01  2:53 UTC (permalink / raw)
  To: Jan Engelhardt
  Cc: richard -rw- weinberger, Netfilter Developer Mailing List,
	Linux Networking Developer Mailing List,
	Linux Kernel Mailing List, eric.dumazet

On Wed, Feb 01, 2012 at 02:24:11AM +0100, Jan Engelhardt wrote:
> On Monday 2012-01-30 10:01, richard -rw- weinberger wrote:
> 
> >On Sun, Jan 22, 2012 at 10:56 PM, Richard Weinberger <richard@nod.at> wrote:
> >> ipt_LOG and ip6_LOG have a lot of common code, merge them
> >> to reduce duplicate code.
> >>
> >> Signed-off-by: Richard Weinberger <richard@nod.at>
> >
> >No comments?
> 
> Adding Pablo to Cc.

I expect to have some spare time to look into this soon.

Sorry for the silence, I need to unplug a bit from the mailing
list to push some developments forward, it's hard to make everything
at the same time ;-)

^ permalink raw reply	[flat|nested] 15+ messages in thread

* Re: [PATCH 1/6] Netfilter: Merge ipt_LOG and ip6_LOG into xt_LOG
  2012-02-01  1:24     ` Jan Engelhardt
  2012-02-01  2:53       ` Pablo Neira Ayuso
@ 2012-02-01  9:14       ` richard -rw- weinberger
  2012-02-01 14:47         ` Jan Engelhardt
  1 sibling, 1 reply; 15+ messages in thread
From: richard -rw- weinberger @ 2012-02-01  9:14 UTC (permalink / raw)
  To: Jan Engelhardt
  Cc: Netfilter Developer Mailing List,
	Linux Networking Developer Mailing List,
	Linux Kernel Mailing List, eric.dumazet, Pablo Neira Ayuso

On Wed, Feb 1, 2012 at 2:24 AM, Jan Engelhardt <jengelh@medozas.de> wrote:
> On Monday 2012-01-30 10:01, richard -rw- weinberger wrote:
>
>>On Sun, Jan 22, 2012 at 10:56 PM, Richard Weinberger <richard@nod.at> wrote:
>>> ipt_LOG and ip6_LOG have a lot of common code, merge them
>>> to reduce duplicate code.
>>>
>>> Signed-off-by: Richard Weinberger <richard@nod.at>
>>
>>No comments?
>
> Adding Pablo to Cc.
>
>
> Do you have the patchset as a retrievable git tree, btw?

Only for kernel stuff:
git://git.kernel.org/pub/scm/linux/kernel/git/rw/misc.git xt_LOG

If you want it for the user space part too, I can setup something...

>
>>[PATCH 6/6] iptables: xt_LOG: Add ring buffer support
>>
>>in libxt_LOG.c:
>>+.size = XT_ALIGN(sizeof(struct xt_log_info_v1) + sizeof(void *)),
>
> Why the extra void*?

The kernel space part of  xt_log_info_v1 differs from the user space struct,
it contains an extra pointer to the ring buffer context.

Iptables must not see this extra pointer because the kernel writes to it.

-- 
Thanks,
//richard

^ permalink raw reply	[flat|nested] 15+ messages in thread

* Re: [PATCH 1/6] Netfilter: Merge ipt_LOG and ip6_LOG into xt_LOG
  2012-02-01  9:14       ` richard -rw- weinberger
@ 2012-02-01 14:47         ` Jan Engelhardt
  2012-02-01 15:08           ` richard -rw- weinberger
  0 siblings, 1 reply; 15+ messages in thread
From: Jan Engelhardt @ 2012-02-01 14:47 UTC (permalink / raw)
  To: richard -rw- weinberger
  Cc: Netfilter Developer Mailing List,
	Linux Networking Developer Mailing List,
	Linux Kernel Mailing List, eric.dumazet, Pablo Neira Ayuso

On Wednesday 2012-02-01 10:14, richard -rw- weinberger wrote:
>>
>> Do you have the patchset as a retrievable git tree, btw?
>
>Only for kernel stuff:
>git://git.kernel.org/pub/scm/linux/kernel/git/rw/misc.git xt_LOG
>
>If you want it for the user space part too, I can setup something...

That would be welcome.

>>>[PATCH 6/6] iptables: xt_LOG: Add ring buffer support
>>>
>>>in libxt_LOG.c:
>>>+.size = XT_ALIGN(sizeof(struct xt_log_info_v1) + sizeof(void *)),
>>
>> Why the extra void*?
>
>The kernel space part of  xt_log_info_v1 differs from the user space struct,
>it contains an extra pointer to the ring buffer context.
>Iptables must not see this extra pointer because the kernel writes to it.

I don't see that extra pointer (outside xt_log_info_v1) that you talk about.

+struct xt_log_info_v1 {
+       unsigned char level;
+       unsigned char logflags;
+       char prefix[30];
+
+       char ring_name[30];
+       unsigned long ring_size;
+       struct xt_LOG_ring_ctx *rctx;
+};

This is the struct as you defined it. First, you must not use
unsigned long (due to its flexible size, which is an ABI breaker; cf.
"Writing Netfilter Modules" PDF), and the pointer must be tagged for
8-alignment as well for the same reason.

Second, the kernel will reject a ruleset if (kernel) .targetsize != (user)
.size. This is likely to occur, since you essentially have
.targetsize=72 in xt_LOG.c and .size=72+sizeof(void*)
in libxt_LOG.

Check commit 8a252e8941cd50e4390e6fedf280ba1c7ff9ac43 for
trailing whitespace, git log -p shows them.

+       if (par->family == NFPROTO_IPV4)
+               m = ipt_log_packet(NFPROTO_IPV4, par->hooknum, skb, par->in,
+                                  par->out, &li, loginfo->prefix);
+#if IS_ENABLED(CONFIG_IPV6)
+       else if (par->family == NFPROTO_IPV6)
+               m = ip6t_log_packet(NFPROTO_IPV6, par->hooknum, skb, par->in,
+                                   par->out, &li, loginfo->prefix);
+#endif
+       else
+               BUG();

Please avoid BUG. Either do nothing in the 'else' case, or print
a courtesy message with some unkn_log_packet() or
WARN_ON_ONCE(). The same goes for xt_LOG_ring_exit, which I vote
for being reduced to WARN_ON as well. If the condition triggers,
one will have a little memory leak, but at least the machine
still runs.

^ permalink raw reply	[flat|nested] 15+ messages in thread

* Re: [PATCH 1/6] Netfilter: Merge ipt_LOG and ip6_LOG into xt_LOG
  2012-02-01 14:47         ` Jan Engelhardt
@ 2012-02-01 15:08           ` richard -rw- weinberger
  2012-02-01 15:19             ` Jan Engelhardt
  0 siblings, 1 reply; 15+ messages in thread
From: richard -rw- weinberger @ 2012-02-01 15:08 UTC (permalink / raw)
  To: Jan Engelhardt
  Cc: Netfilter Developer Mailing List,
	Linux Networking Developer Mailing List,
	Linux Kernel Mailing List, eric.dumazet, Pablo Neira Ayuso

On Wed, Feb 1, 2012 at 3:47 PM, Jan Engelhardt <jengelh@medozas.de> wrote:
>
> On Wednesday 2012-02-01 10:14, richard -rw- weinberger wrote:
>>>
>>> Do you have the patchset as a retrievable git tree, btw?
>>
>>Only for kernel stuff:
>>git://git.kernel.org/pub/scm/linux/kernel/git/rw/misc.git xt_LOG
>>
>>If you want it for the user space part too, I can setup something...
>
> That would be welcome.

Okay, will do!

>>>>[PATCH 6/6] iptables: xt_LOG: Add ring buffer support
>>>>
>>>>in libxt_LOG.c:
>>>>+.size = XT_ALIGN(sizeof(struct xt_log_info_v1) + sizeof(void *)),
>>>
>>> Why the extra void*?
>>
>>The kernel space part of  xt_log_info_v1 differs from the user space struct,
>>it contains an extra pointer to the ring buffer context.
>>Iptables must not see this extra pointer because the kernel writes to it.
>
> I don't see that extra pointer (outside xt_log_info_v1) that you talk about.
>
> +struct xt_log_info_v1 {
> +       unsigned char level;
> +       unsigned char logflags;
> +       char prefix[30];
> +
> +       char ring_name[30];
> +       unsigned long ring_size;
> +       struct xt_LOG_ring_ctx *rctx;
> +};
>
> This is the struct as you defined it. First, you must not use
> unsigned long (due to its flexible size, which is an ABI breaker; cf.
> "Writing Netfilter Modules" PDF), and the pointer must be tagged for
> 8-alignment as well for the same reason.

See:
include/linux/netfilter/xt_LOG.h (user space part).

+struct xt_log_info_v1 {
+       unsigned char level;
+       unsigned char logflags;
+       char prefix[30];
+
+       char ring_name[30];
+       unsigned long ring_siVs.ze;
+};

Here is no context pointer.

I'll fix the unsigned long issue.

> Second, the kernel will reject a ruleset if (kernel) .targetsize != (user)
> .size. This is likely to occur, since you essentially have
> .targetsize=72 in xt_LOG.c and .size=72+sizeof(void*)
> in libxt_LOG.
>
>
>
> Check commit 8a252e8941cd50e4390e6fedf280ba1c7ff9ac43 for
> trailing whitespace, git log -p shows them.
>
> +       if (par->family == NFPROTO_IPV4)
> +               m = ipt_log_packet(NFPROTO_IPV4, par->hooknum, skb, par->in,
> +                                  par->out, &li, loginfo->prefix);
> +#if IS_ENABLED(CONFIG_IPV6)
> +       else if (par->family == NFPROTO_IPV6)
> +               m = ip6t_log_packet(NFPROTO_IPV6, par->hooknum, skb, par->in,
> +                                   par->out, &li, loginfo->prefix);
> +#endif
> +       else
> +               BUG();
>
> Please avoid BUG. Either do nothing in the 'else' case, or print
> a courtesy message with some unkn_log_packet() or
> WARN_ON_ONCE(). The same goes for xt_LOG_ring_exit, which I vote
> for being reduced to WARN_ON as well. If the condition triggers,
> one will have a little memory leak, but at least the machine
> still runs.

Will fix!

-- 
Thanks,
//richard

^ permalink raw reply	[flat|nested] 15+ messages in thread

* Re: [PATCH 1/6] Netfilter: Merge ipt_LOG and ip6_LOG into xt_LOG
  2012-02-01 15:08           ` richard -rw- weinberger
@ 2012-02-01 15:19             ` Jan Engelhardt
  0 siblings, 0 replies; 15+ messages in thread
From: Jan Engelhardt @ 2012-02-01 15:19 UTC (permalink / raw)
  To: richard -rw- weinberger
  Cc: Netfilter Developer Mailing List,
	Linux Networking Developer Mailing List,
	Linux Kernel Mailing List, eric.dumazet, Pablo Neira Ayuso


On Wednesday 2012-02-01 16:08, richard -rw- weinberger wrote:
>> I don't see that extra pointer (outside xt_log_info_v1) that you talk about.
>> +struct xt_log_info_v1 {
>> +       unsigned char level;
>> +       unsigned char logflags;
>> +       char prefix[30];
>> +
>> +       char ring_name[30];
>> +       unsigned long ring_size;
>> +       struct xt_LOG_ring_ctx *rctx;
>> +};
>
>See:
>include/linux/netfilter/xt_LOG.h (user space part).
>
>+struct xt_log_info_v1 {
>+       unsigned char level;
>+       unsigned char logflags;
>+       char prefix[30];
>+
>+       char ring_name[30];
>+       unsigned long ring_siVs.ze;
>+};
>
>Here is no context pointer.

Aw don't do that. That is not maintainer-friendly (since headers
are more or less regularly updated by copying from kernel sources).
Keep the structs the same on each side.

That's why we have .userspacesize in the first place.
See libxt_quota.c on how it's done.

	.size = XT_ALIGN(sizeof(struct xt_log_info_v1)),
	.userspacesize = offsetof(struct xt_log_info_v1, firstkernelmember),

^ permalink raw reply	[flat|nested] 15+ messages in thread

* [PATCH 2/6] ring_buffer: Export for_each_buffer_cpu()
  2012-01-22 21:56 [PATCH v2] Merge ipt_LOG and ip6t_LOG, add ring bufffer support Richard Weinberger
  2012-01-22 21:56 ` [PATCH 1/6] Netfilter: Merge ipt_LOG and ip6_LOG into xt_LOG Richard Weinberger
@ 2012-01-22 21:56 ` Richard Weinberger
  2012-01-22 21:56 ` [PATCH 3/6] xt_log: Make printk() in sb_close() optional Richard Weinberger
                   ` (3 subsequent siblings)
  5 siblings, 0 replies; 15+ messages in thread
From: Richard Weinberger @ 2012-01-22 21:56 UTC (permalink / raw)
  To: netfilter-devel
  Cc: netdev, linux-kernel, eric.dumazet, jengelh, Richard Weinberger

In order to make ring_buffer usable to other modules
for_each_buffer_cpu() needs to be exported.

Signed-off-by: Richard Weinberger <richard@nod.at>
Acked-by: Steven Rostedt <rostedt@goodmis.org>
---
 include/linux/ring_buffer.h |    5 +++++
 kernel/trace/ring_buffer.c  |    7 +++++++
 2 files changed, 12 insertions(+), 0 deletions(-)

diff --git a/include/linux/ring_buffer.h b/include/linux/ring_buffer.h
index 67be037..5c1c29f 100644
--- a/include/linux/ring_buffer.h
+++ b/include/linux/ring_buffer.h
@@ -185,4 +185,9 @@ enum ring_buffer_flags {
 	RB_FL_OVERWRITE		= 1 << 0,
 };
 
+cpumask_var_t *ring_buffer_mask(struct ring_buffer *buffer);
+
+#define for_each_buffer_cpu(buffer, cpu) \
+	for_each_cpu(cpu, *(ring_buffer_mask(buffer)))
+
 #endif /* _LINUX_RING_BUFFER_H */
diff --git a/kernel/trace/ring_buffer.c b/kernel/trace/ring_buffer.c
index f5b7b5c..a4117c5 100644
--- a/kernel/trace/ring_buffer.c
+++ b/kernel/trace/ring_buffer.c
@@ -348,6 +348,7 @@ void *ring_buffer_event_data(struct ring_buffer_event *event)
 }
 EXPORT_SYMBOL_GPL(ring_buffer_event_data);
 
+#undef for_each_buffer_cpu
 #define for_each_buffer_cpu(buffer, cpu)		\
 	for_each_cpu(cpu, buffer->cpumask)
 
@@ -4139,3 +4140,9 @@ static int rb_cpu_notify(struct notifier_block *self,
 	return NOTIFY_OK;
 }
 #endif
+
+cpumask_var_t *ring_buffer_mask(struct ring_buffer *buffer)
+{
+	return &buffer->cpumask;
+}
+EXPORT_SYMBOL_GPL(ring_buffer_mask);
-- 
1.7.7


^ permalink raw reply related	[flat|nested] 15+ messages in thread

* [PATCH 3/6] xt_log: Make printk() in sb_close() optional
  2012-01-22 21:56 [PATCH v2] Merge ipt_LOG and ip6t_LOG, add ring bufffer support Richard Weinberger
  2012-01-22 21:56 ` [PATCH 1/6] Netfilter: Merge ipt_LOG and ip6_LOG into xt_LOG Richard Weinberger
  2012-01-22 21:56 ` [PATCH 2/6] ring_buffer: Export for_each_buffer_cpu() Richard Weinberger
@ 2012-01-22 21:56 ` Richard Weinberger
  2012-01-22 21:56 ` [PATCH 4/6] Netfilter: xt_LOG: Implement ring buffer support Richard Weinberger
                   ` (2 subsequent siblings)
  5 siblings, 0 replies; 15+ messages in thread
From: Richard Weinberger @ 2012-01-22 21:56 UTC (permalink / raw)
  To: netfilter-devel
  Cc: netdev, linux-kernel, eric.dumazet, jengelh, Richard Weinberger

Make printk() in sb_close() optional such that other modules
can build a log string without printing it using printk().

Signed-off-by: Richard Weinberger <richard@nod.at>
---
 include/net/netfilter/xt_log.h |    9 ++++++---
 1 files changed, 6 insertions(+), 3 deletions(-)

diff --git a/include/net/netfilter/xt_log.h b/include/net/netfilter/xt_log.h
index 0dfb34a..767e08d 100644
--- a/include/net/netfilter/xt_log.h
+++ b/include/net/netfilter/xt_log.h
@@ -39,10 +39,12 @@ static struct sbuff *sb_open(void)
 	return m;
 }
 
-static void sb_close(struct sbuff *m)
+static void __sb_close(struct sbuff *m, int print)
 {
-	m->buf[m->count] = 0;
-	printk("%s\n", m->buf);
+	if (print) {
+		m->buf[m->count] = 0;
+		printk("%s\n", m->buf);
+	}
 
 	if (likely(m != &emergency))
 		kfree(m);
@@ -52,3 +54,4 @@ static void sb_close(struct sbuff *m)
 	}
 }
 
+#define sb_close(m)	__sb_close(m, 1)
-- 
1.7.7


^ permalink raw reply related	[flat|nested] 15+ messages in thread

* [PATCH 4/6] Netfilter: xt_LOG: Implement ring buffer support
  2012-01-22 21:56 [PATCH v2] Merge ipt_LOG and ip6t_LOG, add ring bufffer support Richard Weinberger
                   ` (2 preceding siblings ...)
  2012-01-22 21:56 ` [PATCH 3/6] xt_log: Make printk() in sb_close() optional Richard Weinberger
@ 2012-01-22 21:56 ` Richard Weinberger
  2012-01-22 21:56 ` [PATCH 5/6] iptables: Merge libip6t_LOG and libipt_LOG into libxt_LOG Richard Weinberger
  2012-01-22 21:56 ` [PATCH 6/6] iptables: xt_LOG: Add ring buffer support Richard Weinberger
  5 siblings, 0 replies; 15+ messages in thread
From: Richard Weinberger @ 2012-01-22 21:56 UTC (permalink / raw)
  To: netfilter-devel
  Cc: netdev, linux-kernel, eric.dumazet, jengelh, Richard Weinberger

This patch introduces NETFILTER_XT_TARGET_LOG_RING.
It allows logging into various ring buffers which are
represented as pipe-like files in /proc/net/netfilter/xt_LOG_ring/.

Signed-off-by: Richard Weinberger <richard@nod.at>
---
 include/linux/netfilter/xt_LOG.h    |   13 +-
 include/net/netfilter/nf_log.h      |    1 +
 include/net/netfilter/xt_log_ring.h |   24 +
 net/netfilter/Kconfig               |   13 +
 net/netfilter/Makefile              |    2 +
 net/netfilter/xt_LOG.c              |  921 -----------------------------
 net/netfilter/xt_LOG_core.c         | 1102 +++++++++++++++++++++++++++++++++++
 net/netfilter/xt_LOG_ring.c         |  430 ++++++++++++++
 8 files changed, 1584 insertions(+), 922 deletions(-)
 create mode 100644 include/net/netfilter/xt_log_ring.h
 delete mode 100644 net/netfilter/xt_LOG.c
 create mode 100644 net/netfilter/xt_LOG_core.c
 create mode 100644 net/netfilter/xt_LOG_ring.c

diff --git a/include/linux/netfilter/xt_LOG.h b/include/linux/netfilter/xt_LOG.h
index cac0790..4df80ce 100644
--- a/include/linux/netfilter/xt_LOG.h
+++ b/include/linux/netfilter/xt_LOG.h
@@ -8,7 +8,8 @@
 #define XT_LOG_UID		0x08	/* Log UID owning local socket */
 #define XT_LOG_NFLOG		0x10	/* Unsupported, don't reuse */
 #define XT_LOG_MACDECODE	0x20	/* Decode MAC header */
-#define XT_LOG_MASK		0x2f
+#define XT_LOG_ADD_TIMESTAMP	0x40	/* Add a timestamp */
+#define XT_LOG_MASK		0x6f
 
 struct xt_log_info {
 	unsigned char level;
@@ -16,4 +17,14 @@ struct xt_log_info {
 	char prefix[30];
 };
 
+struct xt_log_info_v1 {
+	unsigned char level;
+	unsigned char logflags;
+	char prefix[30];
+
+	char ring_name[30];
+	unsigned long ring_size;
+	struct xt_LOG_ring_ctx *rctx;
+};
+
 #endif /* _XT_LOG_H */
diff --git a/include/net/netfilter/nf_log.h b/include/net/netfilter/nf_log.h
index e991bd0..18a94f9 100644
--- a/include/net/netfilter/nf_log.h
+++ b/include/net/netfilter/nf_log.h
@@ -14,6 +14,7 @@
 
 #define NF_LOG_TYPE_LOG		0x01
 #define NF_LOG_TYPE_ULOG	0x02
+#define NF_LOG_TYPE_RING	0x04
 
 struct nf_loginfo {
 	u_int8_t type;
diff --git a/include/net/netfilter/xt_log_ring.h b/include/net/netfilter/xt_log_ring.h
new file mode 100644
index 0000000..1c14ddf
--- /dev/null
+++ b/include/net/netfilter/xt_log_ring.h
@@ -0,0 +1,24 @@
+#ifndef XT_LOG_RING_H
+#define XT_LOG_RING_H
+
+struct xt_LOG_ring_ctx;
+struct xt_LOG_ring_ctx *xt_LOG_ring_new_ctx(const char *name, size_t rb_size);
+int xt_LOG_ring_add_record(const struct xt_LOG_ring_ctx *rctx, const char *buf, unsigned int len);
+void xt_LOG_ring_get(struct xt_LOG_ring_ctx *ctx);
+void xt_LOG_ring_put(struct xt_LOG_ring_ctx *ctx);
+struct xt_LOG_ring_ctx *xt_LOG_ring_find_ctx(const char *name);
+
+#ifdef CONFIG_NETFILTER_XT_TARGET_LOG_RING
+void xt_LOG_ring_exit(void);
+int xt_LOG_ring_init(void);
+#else
+static inline void xt_LOG_ring_exit(void)
+{
+}
+
+static inline int xt_LOG_ring_init(void)
+{
+        return 0;
+}
+#endif
+#endif
diff --git a/net/netfilter/Kconfig b/net/netfilter/Kconfig
index b895d8b..ac62599 100644
--- a/net/netfilter/Kconfig
+++ b/net/netfilter/Kconfig
@@ -533,6 +533,19 @@ config NETFILTER_XT_TARGET_LOG
 
 	  To compile it as a module, choose M here.  If unsure, say N.
 
+if NETFILTER_XT_TARGET_LOG
+
+config NETFILTER_XT_TARGET_LOG_RING
+	bool  'Ring buffer support'
+	default y
+	select RING_BUFFER
+	help
+	 Using this it is possible to record packets into one or more ring buffers
+	 instead of the kernel syslog.
+	 Each ring buffer is represented as file in /proc/net/netfilter/xt_LOG_ring/.
+
+endif
+
 config NETFILTER_XT_TARGET_MARK
 	tristate '"MARK" target support'
 	depends on NETFILTER_ADVANCED
diff --git a/net/netfilter/Makefile b/net/netfilter/Makefile
index a28c2a6..e93de2a 100644
--- a/net/netfilter/Makefile
+++ b/net/netfilter/Makefile
@@ -58,6 +58,8 @@ obj-$(CONFIG_NETFILTER_XT_TARGET_CT) += xt_CT.o
 obj-$(CONFIG_NETFILTER_XT_TARGET_DSCP) += xt_DSCP.o
 obj-$(CONFIG_NETFILTER_XT_TARGET_HL) += xt_HL.o
 obj-$(CONFIG_NETFILTER_XT_TARGET_LED) += xt_LED.o
+xt_LOG-$(CONFIG_NETFILTER_XT_TARGET_LOG_RING) := xt_LOG_ring.o
+xt_LOG-y += xt_LOG_core.o
 obj-$(CONFIG_NETFILTER_XT_TARGET_LOG) += xt_LOG.o
 obj-$(CONFIG_NETFILTER_XT_TARGET_NFLOG) += xt_NFLOG.o
 obj-$(CONFIG_NETFILTER_XT_TARGET_NFQUEUE) += xt_NFQUEUE.o
diff --git a/net/netfilter/xt_LOG.c b/net/netfilter/xt_LOG.c
deleted file mode 100644
index baa084e..0000000
--- a/net/netfilter/xt_LOG.c
+++ /dev/null
@@ -1,921 +0,0 @@
-/*
- * This is a module which is used for logging packets.
- */
-
-/* (C) 1999-2001 Paul `Rusty' Russell
- * (C) 2002-2004 Netfilter Core Team <coreteam@netfilter.org>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- */
-
-#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
-#include <linux/module.h>
-#include <linux/spinlock.h>
-#include <linux/skbuff.h>
-#include <linux/if_arp.h>
-#include <linux/ip.h>
-#include <net/ipv6.h>
-#include <net/icmp.h>
-#include <net/udp.h>
-#include <net/tcp.h>
-#include <net/route.h>
-
-#include <linux/netfilter.h>
-#include <linux/netfilter/x_tables.h>
-#include <linux/netfilter/xt_LOG.h>
-#include <linux/netfilter_ipv6/ip6_tables.h>
-#include <net/netfilter/nf_log.h>
-#include <net/netfilter/xt_log.h>
-
-static struct nf_loginfo default_loginfo = {
-	.type	= NF_LOG_TYPE_LOG,
-	.u = {
-		.log = {
-			.level    = 5,
-			.logflags = NF_LOG_MASK,
-		},
-	},
-};
-
-static int dump_udp_header(struct sbuff *m, const struct sk_buff *skb,
-			   u8 proto, int fragment, unsigned int offset)
-{
-	struct udphdr _udph;
-	const struct udphdr *uh;
-
-	if (proto == IPPROTO_UDP)
-		/* Max length: 10 "PROTO=UDP "     */
-		sb_add(m, "PROTO=UDP ");
-	else	/* Max length: 14 "PROTO=UDPLITE " */
-		sb_add(m, "PROTO=UDPLITE ");
-
-	if (fragment)
-		goto out;
-
-	/* Max length: 25 "INCOMPLETE [65535 bytes] " */
-	uh = skb_header_pointer(skb, offset, sizeof(_udph), &_udph);
-	if (uh == NULL) {
-		sb_add(m, "INCOMPLETE [%u bytes] ", skb->len - offset);
-
-		return 1;
-	}
-
-	/* Max length: 20 "SPT=65535 DPT=65535 " */
-	sb_add(m, "SPT=%u DPT=%u LEN=%u ", ntohs(uh->source), ntohs(uh->dest),
-		ntohs(uh->len));
-
-out:
-	return 0;
-}
-
-static int dump_tcp_header(struct sbuff *m, const struct sk_buff *skb,
-			   u8 proto, int fragment, unsigned int offset,
-			   unsigned int logflags)
-{
-	struct tcphdr _tcph;
-	const struct tcphdr *th;
-
-	/* Max length: 10 "PROTO=TCP " */
-	sb_add(m, "PROTO=TCP ");
-
-	if (fragment)
-		return 0;
-
-	/* Max length: 25 "INCOMPLETE [65535 bytes] " */
-	th = skb_header_pointer(skb, offset, sizeof(_tcph), &_tcph);
-	if (th == NULL) {
-		sb_add(m, "INCOMPLETE [%u bytes] ", skb->len - offset);
-		return 1;
-	}
-
-	/* Max length: 20 "SPT=65535 DPT=65535 " */
-	sb_add(m, "SPT=%u DPT=%u ", ntohs(th->source), ntohs(th->dest));
-	/* Max length: 30 "SEQ=4294967295 ACK=4294967295 " */
-	if (logflags & XT_LOG_TCPSEQ)
-		sb_add(m, "SEQ=%u ACK=%u ", ntohl(th->seq), ntohl(th->ack_seq));
-
-	/* Max length: 13 "WINDOW=65535 " */
-	sb_add(m, "WINDOW=%u ", ntohs(th->window));
-	/* Max length: 9 "RES=0x3C " */
-	sb_add(m, "RES=0x%02x ", (u_int8_t)(ntohl(tcp_flag_word(th) &
-					    TCP_RESERVED_BITS) >> 22));
-	/* Max length: 32 "CWR ECE URG ACK PSH RST SYN FIN " */
-	if (th->cwr)
-		sb_add(m, "CWR ");
-	if (th->ece)
-		sb_add(m, "ECE ");
-	if (th->urg)
-		sb_add(m, "URG ");
-	if (th->ack)
-		sb_add(m, "ACK ");
-	if (th->psh)
-		sb_add(m, "PSH ");
-	if (th->rst)
-		sb_add(m, "RST ");
-	if (th->syn)
-		sb_add(m, "SYN ");
-	if (th->fin)
-		sb_add(m, "FIN ");
-	/* Max length: 11 "URGP=65535 " */
-	sb_add(m, "URGP=%u ", ntohs(th->urg_ptr));
-
-	if ((logflags & XT_LOG_TCPOPT) && th->doff*4 > sizeof(struct tcphdr)) {
-		u_int8_t _opt[60 - sizeof(struct tcphdr)];
-		const u_int8_t *op;
-		unsigned int i;
-		unsigned int optsize = th->doff*4 - sizeof(struct tcphdr);
-
-		op = skb_header_pointer(skb, offset + sizeof(struct tcphdr),
-					optsize, _opt);
-		if (op == NULL) {
-			sb_add(m, "OPT (TRUNCATED)");
-			return 1;
-		}
-
-		/* Max length: 127 "OPT (" 15*4*2chars ") " */
-		sb_add(m, "OPT (");
-		for (i = 0; i < optsize; i++)
-			sb_add(m, "%02X", op[i]);
-
-		sb_add(m, ") ");
-	}
-
-	return 0;
-}
-
-/* One level of recursion won't kill us */
-static void dump_ipv4_packet(struct sbuff *m,
-			const struct nf_loginfo *info,
-			const struct sk_buff *skb,
-			unsigned int iphoff)
-{
-	struct iphdr _iph;
-	const struct iphdr *ih;
-	unsigned int logflags;
-
-	if (info->type == NF_LOG_TYPE_LOG)
-		logflags = info->u.log.logflags;
-	else
-		logflags = NF_LOG_MASK;
-
-	ih = skb_header_pointer(skb, iphoff, sizeof(_iph), &_iph);
-	if (ih == NULL) {
-		sb_add(m, "TRUNCATED");
-		return;
-	}
-
-	/* Important fields:
-	 * TOS, len, DF/MF, fragment offset, TTL, src, dst, options. */
-	/* Max length: 40 "SRC=255.255.255.255 DST=255.255.255.255 " */
-	sb_add(m, "SRC=%pI4 DST=%pI4 ",
-	       &ih->saddr, &ih->daddr);
-
-	/* Max length: 46 "LEN=65535 TOS=0xFF PREC=0xFF TTL=255 ID=65535 " */
-	sb_add(m, "LEN=%u TOS=0x%02X PREC=0x%02X TTL=%u ID=%u ",
-	       ntohs(ih->tot_len), ih->tos & IPTOS_TOS_MASK,
-	       ih->tos & IPTOS_PREC_MASK, ih->ttl, ntohs(ih->id));
-
-	/* Max length: 6 "CE DF MF " */
-	if (ntohs(ih->frag_off) & IP_CE)
-		sb_add(m, "CE ");
-	if (ntohs(ih->frag_off) & IP_DF)
-		sb_add(m, "DF ");
-	if (ntohs(ih->frag_off) & IP_MF)
-		sb_add(m, "MF ");
-
-	/* Max length: 11 "FRAG:65535 " */
-	if (ntohs(ih->frag_off) & IP_OFFSET)
-		sb_add(m, "FRAG:%u ", ntohs(ih->frag_off) & IP_OFFSET);
-
-	if ((logflags & XT_LOG_IPOPT) &&
-	    ih->ihl * 4 > sizeof(struct iphdr)) {
-		const unsigned char *op;
-		unsigned char _opt[4 * 15 - sizeof(struct iphdr)];
-		unsigned int i, optsize;
-
-		optsize = ih->ihl * 4 - sizeof(struct iphdr);
-		op = skb_header_pointer(skb, iphoff+sizeof(_iph),
-					optsize, _opt);
-		if (op == NULL) {
-			sb_add(m, "TRUNCATED");
-			return;
-		}
-
-		/* Max length: 127 "OPT (" 15*4*2chars ") " */
-		sb_add(m, "OPT (");
-		for (i = 0; i < optsize; i++)
-			sb_add(m, "%02X", op[i]);
-		sb_add(m, ") ");
-	}
-
-	switch (ih->protocol) {
-	case IPPROTO_TCP:
-		if (dump_tcp_header(m, skb, ih->protocol,
-				    ntohs(ih->frag_off) & IP_OFFSET,
-				    iphoff+ih->ihl*4, logflags))
-			return;
-	case IPPROTO_UDP:
-	case IPPROTO_UDPLITE:
-		if (dump_udp_header(m, skb, ih->protocol,
-				    ntohs(ih->frag_off) & IP_OFFSET,
-				    iphoff+ih->ihl*4))
-			return;
-	case IPPROTO_ICMP: {
-		struct icmphdr _icmph;
-		const struct icmphdr *ich;
-		static const size_t required_len[NR_ICMP_TYPES+1]
-			= { [ICMP_ECHOREPLY] = 4,
-			    [ICMP_DEST_UNREACH]
-			    = 8 + sizeof(struct iphdr),
-			    [ICMP_SOURCE_QUENCH]
-			    = 8 + sizeof(struct iphdr),
-			    [ICMP_REDIRECT]
-			    = 8 + sizeof(struct iphdr),
-			    [ICMP_ECHO] = 4,
-			    [ICMP_TIME_EXCEEDED]
-			    = 8 + sizeof(struct iphdr),
-			    [ICMP_PARAMETERPROB]
-			    = 8 + sizeof(struct iphdr),
-			    [ICMP_TIMESTAMP] = 20,
-			    [ICMP_TIMESTAMPREPLY] = 20,
-			    [ICMP_ADDRESS] = 12,
-			    [ICMP_ADDRESSREPLY] = 12 };
-
-		/* Max length: 11 "PROTO=ICMP " */
-		sb_add(m, "PROTO=ICMP ");
-
-		if (ntohs(ih->frag_off) & IP_OFFSET)
-			break;
-
-		/* Max length: 25 "INCOMPLETE [65535 bytes] " */
-		ich = skb_header_pointer(skb, iphoff + ih->ihl * 4,
-					 sizeof(_icmph), &_icmph);
-		if (ich == NULL) {
-			sb_add(m, "INCOMPLETE [%u bytes] ",
-			       skb->len - iphoff - ih->ihl*4);
-			break;
-		}
-
-		/* Max length: 18 "TYPE=255 CODE=255 " */
-		sb_add(m, "TYPE=%u CODE=%u ", ich->type, ich->code);
-
-		/* Max length: 25 "INCOMPLETE [65535 bytes] " */
-		if (ich->type <= NR_ICMP_TYPES &&
-		    required_len[ich->type] &&
-		    skb->len-iphoff-ih->ihl*4 < required_len[ich->type]) {
-			sb_add(m, "INCOMPLETE [%u bytes] ",
-			       skb->len - iphoff - ih->ihl*4);
-			break;
-		}
-
-		switch (ich->type) {
-		case ICMP_ECHOREPLY:
-		case ICMP_ECHO:
-			/* Max length: 19 "ID=65535 SEQ=65535 " */
-			sb_add(m, "ID=%u SEQ=%u ",
-			       ntohs(ich->un.echo.id),
-			       ntohs(ich->un.echo.sequence));
-			break;
-
-		case ICMP_PARAMETERPROB:
-			/* Max length: 14 "PARAMETER=255 " */
-			sb_add(m, "PARAMETER=%u ",
-			       ntohl(ich->un.gateway) >> 24);
-			break;
-		case ICMP_REDIRECT:
-			/* Max length: 24 "GATEWAY=255.255.255.255 " */
-			sb_add(m, "GATEWAY=%pI4 ", &ich->un.gateway);
-			/* Fall through */
-		case ICMP_DEST_UNREACH:
-		case ICMP_SOURCE_QUENCH:
-		case ICMP_TIME_EXCEEDED:
-			/* Max length: 3+maxlen */
-			if (!iphoff) { /* Only recurse once. */
-				sb_add(m, "[");
-				dump_ipv4_packet(m, info, skb,
-					    iphoff + ih->ihl*4+sizeof(_icmph));
-				sb_add(m, "] ");
-			}
-
-			/* Max length: 10 "MTU=65535 " */
-			if (ich->type == ICMP_DEST_UNREACH &&
-			    ich->code == ICMP_FRAG_NEEDED)
-				sb_add(m, "MTU=%u ", ntohs(ich->un.frag.mtu));
-		}
-		break;
-	}
-	/* Max Length */
-	case IPPROTO_AH: {
-		struct ip_auth_hdr _ahdr;
-		const struct ip_auth_hdr *ah;
-
-		if (ntohs(ih->frag_off) & IP_OFFSET)
-			break;
-
-		/* Max length: 9 "PROTO=AH " */
-		sb_add(m, "PROTO=AH ");
-
-		/* Max length: 25 "INCOMPLETE [65535 bytes] " */
-		ah = skb_header_pointer(skb, iphoff+ih->ihl*4,
-					sizeof(_ahdr), &_ahdr);
-		if (ah == NULL) {
-			sb_add(m, "INCOMPLETE [%u bytes] ",
-			       skb->len - iphoff - ih->ihl*4);
-			break;
-		}
-
-		/* Length: 15 "SPI=0xF1234567 " */
-		sb_add(m, "SPI=0x%x ", ntohl(ah->spi));
-		break;
-	}
-	case IPPROTO_ESP: {
-		struct ip_esp_hdr _esph;
-		const struct ip_esp_hdr *eh;
-
-		/* Max length: 10 "PROTO=ESP " */
-		sb_add(m, "PROTO=ESP ");
-
-		if (ntohs(ih->frag_off) & IP_OFFSET)
-			break;
-
-		/* Max length: 25 "INCOMPLETE [65535 bytes] " */
-		eh = skb_header_pointer(skb, iphoff+ih->ihl*4,
-					sizeof(_esph), &_esph);
-		if (eh == NULL) {
-			sb_add(m, "INCOMPLETE [%u bytes] ",
-			       skb->len - iphoff - ih->ihl*4);
-			break;
-		}
-
-		/* Length: 15 "SPI=0xF1234567 " */
-		sb_add(m, "SPI=0x%x ", ntohl(eh->spi));
-		break;
-	}
-	/* Max length: 10 "PROTO 255 " */
-	default:
-		sb_add(m, "PROTO=%u ", ih->protocol);
-	}
-
-	/* Max length: 15 "UID=4294967295 " */
-	if ((logflags & XT_LOG_UID) && !iphoff && skb->sk) {
-		read_lock_bh(&skb->sk->sk_callback_lock);
-		if (skb->sk->sk_socket && skb->sk->sk_socket->file)
-			sb_add(m, "UID=%u GID=%u ",
-				skb->sk->sk_socket->file->f_cred->fsuid,
-				skb->sk->sk_socket->file->f_cred->fsgid);
-		read_unlock_bh(&skb->sk->sk_callback_lock);
-	}
-
-	/* Max length: 16 "MARK=0xFFFFFFFF " */
-	if (!iphoff && skb->mark)
-		sb_add(m, "MARK=0x%x ", skb->mark);
-
-	/* Proto    Max log string length */
-	/* IP:      40+46+6+11+127 = 230 */
-	/* TCP:     10+max(25,20+30+13+9+32+11+127) = 252 */
-	/* UDP:     10+max(25,20) = 35 */
-	/* UDPLITE: 14+max(25,20) = 39 */
-	/* ICMP:    11+max(25, 18+25+max(19,14,24+3+n+10,3+n+10)) = 91+n */
-	/* ESP:     10+max(25)+15 = 50 */
-	/* AH:      9+max(25)+15 = 49 */
-	/* unknown: 10 */
-
-	/* (ICMP allows recursion one level deep) */
-	/* maxlen =  IP + ICMP +  IP + max(TCP,UDP,ICMP,unknown) */
-	/* maxlen = 230+   91  + 230 + 252 = 803 */
-}
-
-static void dump_ipv4_mac_header(struct sbuff *m,
-			    const struct nf_loginfo *info,
-			    const struct sk_buff *skb)
-{
-	struct net_device *dev = skb->dev;
-	unsigned int logflags = 0;
-
-	if (info->type == NF_LOG_TYPE_LOG)
-		logflags = info->u.log.logflags;
-
-	if (!(logflags & XT_LOG_MACDECODE))
-		goto fallback;
-
-	switch (dev->type) {
-	case ARPHRD_ETHER:
-		sb_add(m, "MACSRC=%pM MACDST=%pM MACPROTO=%04x ",
-		       eth_hdr(skb)->h_source, eth_hdr(skb)->h_dest,
-		       ntohs(eth_hdr(skb)->h_proto));
-		return;
-	default:
-		break;
-	}
-
-fallback:
-	sb_add(m, "MAC=");
-	if (dev->hard_header_len &&
-	    skb->mac_header != skb->network_header) {
-		const unsigned char *p = skb_mac_header(skb);
-		unsigned int i;
-
-		sb_add(m, "%02x", *p++);
-		for (i = 1; i < dev->hard_header_len; i++, p++)
-			sb_add(m, ":%02x", *p);
-	}
-	sb_add(m, " ");
-}
-
-static void
-log_packet_common(struct sbuff *m,
-		  u_int8_t pf,
-		  unsigned int hooknum,
-		  const struct sk_buff *skb,
-		  const struct net_device *in,
-		  const struct net_device *out,
-		  const struct nf_loginfo *loginfo,
-		  const char *prefix)
-{
-	sb_add(m, "<%d>%sIN=%s OUT=%s ", loginfo->u.log.level,
-	       prefix,
-	       in ? in->name : "",
-	       out ? out->name : "");
-#ifdef CONFIG_BRIDGE_NETFILTER
-	if (skb->nf_bridge) {
-		const struct net_device *physindev;
-		const struct net_device *physoutdev;
-
-		physindev = skb->nf_bridge->physindev;
-		if (physindev && in != physindev)
-			sb_add(m, "PHYSIN=%s ", physindev->name);
-		physoutdev = skb->nf_bridge->physoutdev;
-		if (physoutdev && out != physoutdev)
-			sb_add(m, "PHYSOUT=%s ", physoutdev->name);
-	}
-#endif
-}
-
-
-static void
-ipt_log_packet(u_int8_t pf,
-	       unsigned int hooknum,
-	       const struct sk_buff *skb,
-	       const struct net_device *in,
-	       const struct net_device *out,
-	       const struct nf_loginfo *loginfo,
-	       const char *prefix)
-{
-	struct sbuff *m = sb_open();
-
-	if (!loginfo)
-		loginfo = &default_loginfo;
-
-	log_packet_common(m, pf, hooknum, skb, in, out, loginfo, prefix);
-
-	if (in != NULL)
-		dump_ipv4_mac_header(m, loginfo, skb);
-
-	dump_ipv4_packet(m, loginfo, skb, 0);
-
-	sb_close(m);
-}
-
-#if IS_ENABLED(CONFIG_IPV6)
-/* One level of recursion won't kill us */
-static void dump_ipv6_packet(struct sbuff *m,
-			const struct nf_loginfo *info,
-			const struct sk_buff *skb, unsigned int ip6hoff,
-			int recurse)
-{
-	u_int8_t currenthdr;
-	int fragment;
-	struct ipv6hdr _ip6h;
-	const struct ipv6hdr *ih;
-	unsigned int ptr;
-	unsigned int hdrlen = 0;
-	unsigned int logflags;
-
-	if (info->type == NF_LOG_TYPE_LOG)
-		logflags = info->u.log.logflags;
-	else
-		logflags = NF_LOG_MASK;
-
-	ih = skb_header_pointer(skb, ip6hoff, sizeof(_ip6h), &_ip6h);
-	if (ih == NULL) {
-		sb_add(m, "TRUNCATED");
-		return;
-	}
-
-	/* Max length: 88 "SRC=0000.0000.0000.0000.0000.0000.0000.0000 DST=0000.0000.0000.0000.0000.0000.0000.0000 " */
-	sb_add(m, "SRC=%pI6 DST=%pI6 ", &ih->saddr, &ih->daddr);
-
-	/* Max length: 44 "LEN=65535 TC=255 HOPLIMIT=255 FLOWLBL=FFFFF " */
-	sb_add(m, "LEN=%Zu TC=%u HOPLIMIT=%u FLOWLBL=%u ",
-	       ntohs(ih->payload_len) + sizeof(struct ipv6hdr),
-	       (ntohl(*(__be32 *)ih) & 0x0ff00000) >> 20,
-	       ih->hop_limit,
-	       (ntohl(*(__be32 *)ih) & 0x000fffff));
-
-	fragment = 0;
-	ptr = ip6hoff + sizeof(struct ipv6hdr);
-	currenthdr = ih->nexthdr;
-	while (currenthdr != NEXTHDR_NONE && ip6t_ext_hdr(currenthdr)) {
-		struct ipv6_opt_hdr _hdr;
-		const struct ipv6_opt_hdr *hp;
-
-		hp = skb_header_pointer(skb, ptr, sizeof(_hdr), &_hdr);
-		if (hp == NULL) {
-			sb_add(m, "TRUNCATED");
-			return;
-		}
-
-		/* Max length: 48 "OPT (...) " */
-		if (logflags & XT_LOG_IPOPT)
-			sb_add(m, "OPT ( ");
-
-		switch (currenthdr) {
-		case IPPROTO_FRAGMENT: {
-			struct frag_hdr _fhdr;
-			const struct frag_hdr *fh;
-
-			sb_add(m, "FRAG:");
-			fh = skb_header_pointer(skb, ptr, sizeof(_fhdr),
-						&_fhdr);
-			if (fh == NULL) {
-				sb_add(m, "TRUNCATED ");
-				return;
-			}
-
-			/* Max length: 6 "65535 " */
-			sb_add(m, "%u ", ntohs(fh->frag_off) & 0xFFF8);
-
-			/* Max length: 11 "INCOMPLETE " */
-			if (fh->frag_off & htons(0x0001))
-				sb_add(m, "INCOMPLETE ");
-
-			sb_add(m, "ID:%08x ", ntohl(fh->identification));
-
-			if (ntohs(fh->frag_off) & 0xFFF8)
-				fragment = 1;
-
-			hdrlen = 8;
-
-			break;
-		}
-		case IPPROTO_DSTOPTS:
-		case IPPROTO_ROUTING:
-		case IPPROTO_HOPOPTS:
-			if (fragment) {
-				if (logflags & XT_LOG_IPOPT)
-					sb_add(m, ")");
-				return;
-			}
-			hdrlen = ipv6_optlen(hp);
-			break;
-		/* Max Length */
-		case IPPROTO_AH:
-			if (logflags & XT_LOG_IPOPT) {
-				struct ip_auth_hdr _ahdr;
-				const struct ip_auth_hdr *ah;
-
-				/* Max length: 3 "AH " */
-				sb_add(m, "AH ");
-
-				if (fragment) {
-					sb_add(m, ")");
-					return;
-				}
-
-				ah = skb_header_pointer(skb, ptr, sizeof(_ahdr),
-							&_ahdr);
-				if (ah == NULL) {
-					/*
-					 * Max length: 26 "INCOMPLETE [65535
-					 *  bytes] )"
-					 */
-					sb_add(m, "INCOMPLETE [%u bytes] )",
-					       skb->len - ptr);
-					return;
-				}
-
-				/* Length: 15 "SPI=0xF1234567 */
-				sb_add(m, "SPI=0x%x ", ntohl(ah->spi));
-
-			}
-
-			hdrlen = (hp->hdrlen+2)<<2;
-			break;
-		case IPPROTO_ESP:
-			if (logflags & XT_LOG_IPOPT) {
-				struct ip_esp_hdr _esph;
-				const struct ip_esp_hdr *eh;
-
-				/* Max length: 4 "ESP " */
-				sb_add(m, "ESP ");
-
-				if (fragment) {
-					sb_add(m, ")");
-					return;
-				}
-
-				/*
-				 * Max length: 26 "INCOMPLETE [65535 bytes] )"
-				 */
-				eh = skb_header_pointer(skb, ptr, sizeof(_esph),
-							&_esph);
-				if (eh == NULL) {
-					sb_add(m, "INCOMPLETE [%u bytes] )",
-					       skb->len - ptr);
-					return;
-				}
-
-				/* Length: 16 "SPI=0xF1234567 )" */
-				sb_add(m, "SPI=0x%x )", ntohl(eh->spi));
-
-			}
-			return;
-		default:
-			/* Max length: 20 "Unknown Ext Hdr 255" */
-			sb_add(m, "Unknown Ext Hdr %u", currenthdr);
-			return;
-		}
-		if (logflags & XT_LOG_IPOPT)
-			sb_add(m, ") ");
-
-		currenthdr = hp->nexthdr;
-		ptr += hdrlen;
-	}
-
-	switch (currenthdr) {
-	case IPPROTO_TCP:
-		if (dump_tcp_header(m, skb, currenthdr, fragment, ptr,
-		    logflags))
-			return;
-	case IPPROTO_UDP:
-	case IPPROTO_UDPLITE:
-		if (dump_udp_header(m, skb, currenthdr, fragment, ptr))
-			return;
-	case IPPROTO_ICMPV6: {
-		struct icmp6hdr _icmp6h;
-		const struct icmp6hdr *ic;
-
-		/* Max length: 13 "PROTO=ICMPv6 " */
-		sb_add(m, "PROTO=ICMPv6 ");
-
-		if (fragment)
-			break;
-
-		/* Max length: 25 "INCOMPLETE [65535 bytes] " */
-		ic = skb_header_pointer(skb, ptr, sizeof(_icmp6h), &_icmp6h);
-		if (ic == NULL) {
-			sb_add(m, "INCOMPLETE [%u bytes] ", skb->len - ptr);
-			return;
-		}
-
-		/* Max length: 18 "TYPE=255 CODE=255 " */
-		sb_add(m, "TYPE=%u CODE=%u ", ic->icmp6_type, ic->icmp6_code);
-
-		switch (ic->icmp6_type) {
-		case ICMPV6_ECHO_REQUEST:
-		case ICMPV6_ECHO_REPLY:
-			/* Max length: 19 "ID=65535 SEQ=65535 " */
-			sb_add(m, "ID=%u SEQ=%u ",
-				ntohs(ic->icmp6_identifier),
-				ntohs(ic->icmp6_sequence));
-			break;
-		case ICMPV6_MGM_QUERY:
-		case ICMPV6_MGM_REPORT:
-		case ICMPV6_MGM_REDUCTION:
-			break;
-
-		case ICMPV6_PARAMPROB:
-			/* Max length: 17 "POINTER=ffffffff " */
-			sb_add(m, "POINTER=%08x ", ntohl(ic->icmp6_pointer));
-			/* Fall through */
-		case ICMPV6_DEST_UNREACH:
-		case ICMPV6_PKT_TOOBIG:
-		case ICMPV6_TIME_EXCEED:
-			/* Max length: 3+maxlen */
-			if (recurse) {
-				sb_add(m, "[");
-				dump_ipv6_packet(m, info, skb,
-					    ptr + sizeof(_icmp6h), 0);
-				sb_add(m, "] ");
-			}
-
-			/* Max length: 10 "MTU=65535 " */
-			if (ic->icmp6_type == ICMPV6_PKT_TOOBIG)
-				sb_add(m, "MTU=%u ", ntohl(ic->icmp6_mtu));
-		}
-		break;
-	}
-	/* Max length: 10 "PROTO=255 " */
-	default:
-		sb_add(m, "PROTO=%u ", currenthdr);
-	}
-
-	/* Max length: 15 "UID=4294967295 " */
-	if ((logflags & XT_LOG_UID) && recurse && skb->sk) {
-		read_lock_bh(&skb->sk->sk_callback_lock);
-		if (skb->sk->sk_socket && skb->sk->sk_socket->file)
-			sb_add(m, "UID=%u GID=%u ",
-				skb->sk->sk_socket->file->f_cred->fsuid,
-				skb->sk->sk_socket->file->f_cred->fsgid);
-		read_unlock_bh(&skb->sk->sk_callback_lock);
-	}
-
-	/* Max length: 16 "MARK=0xFFFFFFFF " */
-	if (!recurse && skb->mark)
-		sb_add(m, "MARK=0x%x ", skb->mark);
-}
-
-static void dump_ipv6_mac_header(struct sbuff *m,
-			    const struct nf_loginfo *info,
-			    const struct sk_buff *skb)
-{
-	struct net_device *dev = skb->dev;
-	unsigned int logflags = 0;
-
-	if (info->type == NF_LOG_TYPE_LOG)
-		logflags = info->u.log.logflags;
-
-	if (!(logflags & XT_LOG_MACDECODE))
-		goto fallback;
-
-	switch (dev->type) {
-	case ARPHRD_ETHER:
-		sb_add(m, "MACSRC=%pM MACDST=%pM MACPROTO=%04x ",
-		       eth_hdr(skb)->h_source, eth_hdr(skb)->h_dest,
-		       ntohs(eth_hdr(skb)->h_proto));
-		return;
-	default:
-		break;
-	}
-
-fallback:
-	sb_add(m, "MAC=");
-	if (dev->hard_header_len &&
-	    skb->mac_header != skb->network_header) {
-		const unsigned char *p = skb_mac_header(skb);
-		unsigned int len = dev->hard_header_len;
-		unsigned int i;
-
-		if (dev->type == ARPHRD_SIT) {
-			p -= ETH_HLEN;
-
-			if (p < skb->head)
-				p = NULL;
-		}
-
-		if (p != NULL) {
-			sb_add(m, "%02x", *p++);
-			for (i = 1; i < len; i++)
-				sb_add(m, ":%02x", *p++);
-		}
-		sb_add(m, " ");
-
-		if (dev->type == ARPHRD_SIT) {
-			const struct iphdr *iph =
-				(struct iphdr *)skb_mac_header(skb);
-			sb_add(m, "TUNNEL=%pI4->%pI4 ", &iph->saddr,
-			       &iph->daddr);
-		}
-	} else
-		sb_add(m, " ");
-}
-
-static void
-ip6t_log_packet(u_int8_t pf,
-		unsigned int hooknum,
-		const struct sk_buff *skb,
-		const struct net_device *in,
-		const struct net_device *out,
-		const struct nf_loginfo *loginfo,
-		const char *prefix)
-{
-	struct sbuff *m = sb_open();
-
-	if (!loginfo)
-		loginfo = &default_loginfo;
-
-	log_packet_common(m, pf, hooknum, skb, in, out, loginfo, prefix);
-
-	if (in != NULL)
-		dump_ipv6_mac_header(m, loginfo, skb);
-
-	dump_ipv6_packet(m, loginfo, skb, skb_network_offset(skb), 1);
-
-	sb_close(m);
-}
-#endif
-
-static unsigned int
-log_tg(struct sk_buff *skb, const struct xt_action_param *par)
-{
-	const struct xt_log_info *loginfo = par->targinfo;
-	struct nf_loginfo li;
-
-	li.type = NF_LOG_TYPE_LOG;
-	li.u.log.level = loginfo->level;
-	li.u.log.logflags = loginfo->logflags;
-
-	if (par->family == NFPROTO_IPV4)
-		ipt_log_packet(NFPROTO_IPV4, par->hooknum, skb, par->in,
-			       par->out, &li, loginfo->prefix);
-#if IS_ENABLED(CONFIG_IPV6)
-	else if (par->family == NFPROTO_IPV6)
-		ip6t_log_packet(NFPROTO_IPV6, par->hooknum, skb, par->in,
-				par->out, &li, loginfo->prefix);
-#endif
-	else
-		BUG();
-
-	return XT_CONTINUE;
-}
-
-static int log_tg_check(const struct xt_tgchk_param *par)
-{
-	const struct xt_log_info *loginfo = par->targinfo;
-
-	if (par->family != NFPROTO_IPV4 && par->family != NFPROTO_IPV6)
-		return -EINVAL;
-
-	if (loginfo->level >= 8) {
-		pr_debug("level %u >= 8\n", loginfo->level);
-		return -EINVAL;
-	}
-
-	if (loginfo->prefix[sizeof(loginfo->prefix)-1] != '\0') {
-		pr_debug("prefix is not null-terminated\n");
-		return -EINVAL;
-	}
-
-	return 0;
-}
-
-static struct xt_target log_tg_regs[] __read_mostly = {
-	{
-		.name		= "LOG",
-		.family		= NFPROTO_IPV4,
-		.target		= log_tg,
-		.targetsize	= sizeof(struct xt_log_info),
-		.checkentry	= log_tg_check,
-		.me		= THIS_MODULE,
-	},
-#if IS_ENABLED(CONFIG_IPV6)
-	{
-		.name		= "LOG",
-		.family		= NFPROTO_IPV6,
-		.target		= log_tg,
-		.targetsize	= sizeof(struct xt_log_info),
-		.checkentry	= log_tg_check,
-		.me		= THIS_MODULE,
-	},
-#endif
-};
-
-static struct nf_logger ipt_log_logger __read_mostly = {
-	.name		= "ipt_LOG",
-	.logfn		= &ipt_log_packet,
-	.me		= THIS_MODULE,
-};
-
-#if IS_ENABLED(CONFIG_IPV6)
-static struct nf_logger ip6t_log_logger __read_mostly = {
-	.name		= "ip6t_LOG",
-	.logfn		= &ip6t_log_packet,
-	.me		= THIS_MODULE,
-};
-#endif
-
-static int __init log_tg_init(void)
-{
-	int ret;
-
-	ret = xt_register_targets(log_tg_regs, ARRAY_SIZE(log_tg_regs));
-	if (ret < 0)
-		return ret;
-
-	nf_log_register(NFPROTO_IPV4, &ipt_log_logger);
-#if IS_ENABLED(CONFIG_IPV6)
-	nf_log_register(NFPROTO_IPV6, &ip6t_log_logger);
-#endif
-	return 0;
-}
-
-static void __exit log_tg_exit(void)
-{
-	nf_log_unregister(&ipt_log_logger);
-#if IS_ENABLED(CONFIG_IPV6)
-	nf_log_unregister(&ip6t_log_logger);
-#endif
-	xt_unregister_targets(log_tg_regs, ARRAY_SIZE(log_tg_regs));
-}
-
-module_init(log_tg_init);
-module_exit(log_tg_exit);
-
-MODULE_LICENSE("GPL");
-MODULE_AUTHOR("Netfilter Core Team <coreteam@netfilter.org>");
-MODULE_AUTHOR("Jan Rekorajski <baggins@pld.org.pl>");
-MODULE_DESCRIPTION("Xtables: IPv4/IPv6 packet logging");
-MODULE_ALIAS("ipt_LOG");
-MODULE_ALIAS("ip6t_LOG");
diff --git a/net/netfilter/xt_LOG_core.c b/net/netfilter/xt_LOG_core.c
new file mode 100644
index 0000000..4c6abca
--- /dev/null
+++ b/net/netfilter/xt_LOG_core.c
@@ -0,0 +1,1102 @@
+/*
+ * This is a module which is used for logging packets.
+ */
+
+/* (C) 1999-2001 Paul `Rusty' Russell
+ * (C) 2002-2004 Netfilter Core Team <coreteam@netfilter.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/spinlock.h>
+#include <linux/skbuff.h>
+#include <linux/if_arp.h>
+#include <linux/ip.h>
+#include <linux/ctype.h>
+#include <net/ipv6.h>
+#include <net/icmp.h>
+#include <net/udp.h>
+#include <net/tcp.h>
+#include <net/route.h>
+
+#include <linux/netfilter.h>
+#include <linux/netfilter/x_tables.h>
+#include <linux/netfilter/xt_LOG.h>
+#include <linux/netfilter_ipv6/ip6_tables.h>
+#include <net/netfilter/nf_log.h>
+#include <net/netfilter/xt_log.h>
+#include <net/netfilter/xt_log_ring.h>
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Netfilter Core Team <coreteam@netfilter.org>");
+MODULE_AUTHOR("Jan Rekorajski <baggins@pld.org.pl>");
+MODULE_AUTHOR("Richard Weinberger <richard@nod.at>");
+MODULE_DESCRIPTION("Xtables: IPv4/IPv6 packet logging");
+MODULE_ALIAS("ipt_LOG");
+MODULE_ALIAS("ip6t_LOG");
+
+static struct nf_loginfo default_loginfo = {
+	.type	= NF_LOG_TYPE_LOG,
+	.u = {
+		.log = {
+			.level    = 5,
+			.logflags = NF_LOG_MASK,
+		},
+	},
+};
+
+static int dump_udp_header(struct sbuff *m, const struct sk_buff *skb,
+			   u8 proto, int fragment, unsigned int offset)
+{
+	struct udphdr _udph;
+	const struct udphdr *uh;
+
+	if (proto == IPPROTO_UDP)
+		/* Max length: 10 "PROTO=UDP "     */
+		sb_add(m, "PROTO=UDP ");
+	else	/* Max length: 14 "PROTO=UDPLITE " */
+		sb_add(m, "PROTO=UDPLITE ");
+
+	if (fragment)
+		goto out;
+
+	/* Max length: 25 "INCOMPLETE [65535 bytes] " */
+	uh = skb_header_pointer(skb, offset, sizeof(_udph), &_udph);
+	if (uh == NULL) {
+		sb_add(m, "INCOMPLETE [%u bytes] ", skb->len - offset);
+
+		return 1;
+	}
+
+	/* Max length: 20 "SPT=65535 DPT=65535 " */
+	sb_add(m, "SPT=%u DPT=%u LEN=%u ", ntohs(uh->source), ntohs(uh->dest),
+		ntohs(uh->len));
+
+out:
+	return 0;
+}
+
+static int dump_tcp_header(struct sbuff *m, const struct sk_buff *skb,
+			   u8 proto, int fragment, unsigned int offset,
+			   unsigned int logflags)
+{
+	struct tcphdr _tcph;
+	const struct tcphdr *th;
+
+	/* Max length: 10 "PROTO=TCP " */
+	sb_add(m, "PROTO=TCP ");
+
+	if (fragment)
+		return 0;
+
+	/* Max length: 25 "INCOMPLETE [65535 bytes] " */
+	th = skb_header_pointer(skb, offset, sizeof(_tcph), &_tcph);
+	if (th == NULL) {
+		sb_add(m, "INCOMPLETE [%u bytes] ", skb->len - offset);
+		return 1;
+	}
+
+	/* Max length: 20 "SPT=65535 DPT=65535 " */
+	sb_add(m, "SPT=%u DPT=%u ", ntohs(th->source), ntohs(th->dest));
+	/* Max length: 30 "SEQ=4294967295 ACK=4294967295 " */
+	if (logflags & XT_LOG_TCPSEQ)
+		sb_add(m, "SEQ=%u ACK=%u ", ntohl(th->seq), ntohl(th->ack_seq));
+
+	/* Max length: 13 "WINDOW=65535 " */
+	sb_add(m, "WINDOW=%u ", ntohs(th->window));
+	/* Max length: 9 "RES=0x3C " */
+	sb_add(m, "RES=0x%02x ", (u_int8_t)(ntohl(tcp_flag_word(th) &
+					    TCP_RESERVED_BITS) >> 22));
+	/* Max length: 32 "CWR ECE URG ACK PSH RST SYN FIN " */
+	if (th->cwr)
+		sb_add(m, "CWR ");
+	if (th->ece)
+		sb_add(m, "ECE ");
+	if (th->urg)
+		sb_add(m, "URG ");
+	if (th->ack)
+		sb_add(m, "ACK ");
+	if (th->psh)
+		sb_add(m, "PSH ");
+	if (th->rst)
+		sb_add(m, "RST ");
+	if (th->syn)
+		sb_add(m, "SYN ");
+	if (th->fin)
+		sb_add(m, "FIN ");
+	/* Max length: 11 "URGP=65535 " */
+	sb_add(m, "URGP=%u ", ntohs(th->urg_ptr));
+
+	if ((logflags & XT_LOG_TCPOPT) && th->doff*4 > sizeof(struct tcphdr)) {
+		u_int8_t _opt[60 - sizeof(struct tcphdr)];
+		const u_int8_t *op;
+		unsigned int i;
+		unsigned int optsize = th->doff*4 - sizeof(struct tcphdr);
+
+		op = skb_header_pointer(skb, offset + sizeof(struct tcphdr),
+					optsize, _opt);
+		if (op == NULL) {
+			sb_add(m, "OPT (TRUNCATED)");
+			return 1;
+		}
+
+		/* Max length: 127 "OPT (" 15*4*2chars ") " */
+		sb_add(m, "OPT (");
+		for (i = 0; i < optsize; i++)
+			sb_add(m, "%02X", op[i]);
+
+		sb_add(m, ") ");
+	}
+
+	return 0;
+}
+
+/* One level of recursion won't kill us */
+static void dump_ipv4_packet(struct sbuff *m,
+			const struct nf_loginfo *info,
+			const struct sk_buff *skb,
+			unsigned int iphoff)
+{
+	struct iphdr _iph;
+	const struct iphdr *ih;
+	unsigned int logflags;
+
+	if (info->type == NF_LOG_TYPE_LOG || info->type == NF_LOG_TYPE_RING)
+		logflags = info->u.log.logflags;
+	else
+		logflags = NF_LOG_MASK;
+
+	ih = skb_header_pointer(skb, iphoff, sizeof(_iph), &_iph);
+	if (ih == NULL) {
+		sb_add(m, "TRUNCATED");
+		return;
+	}
+
+	/* Important fields:
+	 * TOS, len, DF/MF, fragment offset, TTL, src, dst, options. */
+	/* Max length: 40 "SRC=255.255.255.255 DST=255.255.255.255 " */
+	sb_add(m, "SRC=%pI4 DST=%pI4 ",
+	       &ih->saddr, &ih->daddr);
+
+	/* Max length: 46 "LEN=65535 TOS=0xFF PREC=0xFF TTL=255 ID=65535 " */
+	sb_add(m, "LEN=%u TOS=0x%02X PREC=0x%02X TTL=%u ID=%u ",
+	       ntohs(ih->tot_len), ih->tos & IPTOS_TOS_MASK,
+	       ih->tos & IPTOS_PREC_MASK, ih->ttl, ntohs(ih->id));
+
+	/* Max length: 6 "CE DF MF " */
+	if (ntohs(ih->frag_off) & IP_CE)
+		sb_add(m, "CE ");
+	if (ntohs(ih->frag_off) & IP_DF)
+		sb_add(m, "DF ");
+	if (ntohs(ih->frag_off) & IP_MF)
+		sb_add(m, "MF ");
+
+	/* Max length: 11 "FRAG:65535 " */
+	if (ntohs(ih->frag_off) & IP_OFFSET)
+		sb_add(m, "FRAG:%u ", ntohs(ih->frag_off) & IP_OFFSET);
+
+	if ((logflags & XT_LOG_IPOPT) &&
+	    ih->ihl * 4 > sizeof(struct iphdr)) {
+		const unsigned char *op;
+		unsigned char _opt[4 * 15 - sizeof(struct iphdr)];
+		unsigned int i, optsize;
+
+		optsize = ih->ihl * 4 - sizeof(struct iphdr);
+		op = skb_header_pointer(skb, iphoff+sizeof(_iph),
+					optsize, _opt);
+		if (op == NULL) {
+			sb_add(m, "TRUNCATED");
+			return;
+		}
+
+		/* Max length: 127 "OPT (" 15*4*2chars ") " */
+		sb_add(m, "OPT (");
+		for (i = 0; i < optsize; i++)
+			sb_add(m, "%02X", op[i]);
+		sb_add(m, ") ");
+	}
+
+	switch (ih->protocol) {
+	case IPPROTO_TCP:
+		if (dump_tcp_header(m, skb, ih->protocol,
+				    ntohs(ih->frag_off) & IP_OFFSET,
+				    iphoff+ih->ihl*4, logflags))
+			return;
+	case IPPROTO_UDP:
+	case IPPROTO_UDPLITE:
+		if (dump_udp_header(m, skb, ih->protocol,
+				    ntohs(ih->frag_off) & IP_OFFSET,
+				    iphoff+ih->ihl*4))
+			return;
+	case IPPROTO_ICMP: {
+		struct icmphdr _icmph;
+		const struct icmphdr *ich;
+		static const size_t required_len[NR_ICMP_TYPES+1]
+			= { [ICMP_ECHOREPLY] = 4,
+			    [ICMP_DEST_UNREACH]
+			    = 8 + sizeof(struct iphdr),
+			    [ICMP_SOURCE_QUENCH]
+			    = 8 + sizeof(struct iphdr),
+			    [ICMP_REDIRECT]
+			    = 8 + sizeof(struct iphdr),
+			    [ICMP_ECHO] = 4,
+			    [ICMP_TIME_EXCEEDED]
+			    = 8 + sizeof(struct iphdr),
+			    [ICMP_PARAMETERPROB]
+			    = 8 + sizeof(struct iphdr),
+			    [ICMP_TIMESTAMP] = 20,
+			    [ICMP_TIMESTAMPREPLY] = 20,
+			    [ICMP_ADDRESS] = 12,
+			    [ICMP_ADDRESSREPLY] = 12 };
+
+		/* Max length: 11 "PROTO=ICMP " */
+		sb_add(m, "PROTO=ICMP ");
+
+		if (ntohs(ih->frag_off) & IP_OFFSET)
+			break;
+
+		/* Max length: 25 "INCOMPLETE [65535 bytes] " */
+		ich = skb_header_pointer(skb, iphoff + ih->ihl * 4,
+					 sizeof(_icmph), &_icmph);
+		if (ich == NULL) {
+			sb_add(m, "INCOMPLETE [%u bytes] ",
+			       skb->len - iphoff - ih->ihl*4);
+			break;
+		}
+
+		/* Max length: 18 "TYPE=255 CODE=255 " */
+		sb_add(m, "TYPE=%u CODE=%u ", ich->type, ich->code);
+
+		/* Max length: 25 "INCOMPLETE [65535 bytes] " */
+		if (ich->type <= NR_ICMP_TYPES &&
+		    required_len[ich->type] &&
+		    skb->len-iphoff-ih->ihl*4 < required_len[ich->type]) {
+			sb_add(m, "INCOMPLETE [%u bytes] ",
+			       skb->len - iphoff - ih->ihl*4);
+			break;
+		}
+
+		switch (ich->type) {
+		case ICMP_ECHOREPLY:
+		case ICMP_ECHO:
+			/* Max length: 19 "ID=65535 SEQ=65535 " */
+			sb_add(m, "ID=%u SEQ=%u ",
+			       ntohs(ich->un.echo.id),
+			       ntohs(ich->un.echo.sequence));
+			break;
+
+		case ICMP_PARAMETERPROB:
+			/* Max length: 14 "PARAMETER=255 " */
+			sb_add(m, "PARAMETER=%u ",
+			       ntohl(ich->un.gateway) >> 24);
+			break;
+		case ICMP_REDIRECT:
+			/* Max length: 24 "GATEWAY=255.255.255.255 " */
+			sb_add(m, "GATEWAY=%pI4 ", &ich->un.gateway);
+			/* Fall through */
+		case ICMP_DEST_UNREACH:
+		case ICMP_SOURCE_QUENCH:
+		case ICMP_TIME_EXCEEDED:
+			/* Max length: 3+maxlen */
+			if (!iphoff) { /* Only recurse once. */
+				sb_add(m, "[");
+				dump_ipv4_packet(m, info, skb,
+					    iphoff + ih->ihl*4+sizeof(_icmph));
+				sb_add(m, "] ");
+			}
+
+			/* Max length: 10 "MTU=65535 " */
+			if (ich->type == ICMP_DEST_UNREACH &&
+			    ich->code == ICMP_FRAG_NEEDED)
+				sb_add(m, "MTU=%u ", ntohs(ich->un.frag.mtu));
+		}
+		break;
+	}
+	/* Max Length */
+	case IPPROTO_AH: {
+		struct ip_auth_hdr _ahdr;
+		const struct ip_auth_hdr *ah;
+
+		if (ntohs(ih->frag_off) & IP_OFFSET)
+			break;
+
+		/* Max length: 9 "PROTO=AH " */
+		sb_add(m, "PROTO=AH ");
+
+		/* Max length: 25 "INCOMPLETE [65535 bytes] " */
+		ah = skb_header_pointer(skb, iphoff+ih->ihl*4,
+					sizeof(_ahdr), &_ahdr);
+		if (ah == NULL) {
+			sb_add(m, "INCOMPLETE [%u bytes] ",
+			       skb->len - iphoff - ih->ihl*4);
+			break;
+		}
+
+		/* Length: 15 "SPI=0xF1234567 " */
+		sb_add(m, "SPI=0x%x ", ntohl(ah->spi));
+		break;
+	}
+	case IPPROTO_ESP: {
+		struct ip_esp_hdr _esph;
+		const struct ip_esp_hdr *eh;
+
+		/* Max length: 10 "PROTO=ESP " */
+		sb_add(m, "PROTO=ESP ");
+
+		if (ntohs(ih->frag_off) & IP_OFFSET)
+			break;
+
+		/* Max length: 25 "INCOMPLETE [65535 bytes] " */
+		eh = skb_header_pointer(skb, iphoff+ih->ihl*4,
+					sizeof(_esph), &_esph);
+		if (eh == NULL) {
+			sb_add(m, "INCOMPLETE [%u bytes] ",
+			       skb->len - iphoff - ih->ihl*4);
+			break;
+		}
+
+		/* Length: 15 "SPI=0xF1234567 " */
+		sb_add(m, "SPI=0x%x ", ntohl(eh->spi));
+		break;
+	}
+	/* Max length: 10 "PROTO 255 " */
+	default:
+		sb_add(m, "PROTO=%u ", ih->protocol);
+	}
+
+	/* Max length: 15 "UID=4294967295 " */
+	if ((logflags & XT_LOG_UID) && !iphoff && skb->sk) {
+		read_lock_bh(&skb->sk->sk_callback_lock);
+		if (skb->sk->sk_socket && skb->sk->sk_socket->file)
+			sb_add(m, "UID=%u GID=%u ",
+				skb->sk->sk_socket->file->f_cred->fsuid,
+				skb->sk->sk_socket->file->f_cred->fsgid);
+		read_unlock_bh(&skb->sk->sk_callback_lock);
+	}
+
+	/* Max length: 16 "MARK=0xFFFFFFFF " */
+	if (!iphoff && skb->mark)
+		sb_add(m, "MARK=0x%x ", skb->mark);
+
+	/* Proto    Max log string length */
+	/* IP:      40+46+6+11+127 = 230 */
+	/* TCP:     10+max(25,20+30+13+9+32+11+127) = 252 */
+	/* UDP:     10+max(25,20) = 35 */
+	/* UDPLITE: 14+max(25,20) = 39 */
+	/* ICMP:    11+max(25, 18+25+max(19,14,24+3+n+10,3+n+10)) = 91+n */
+	/* ESP:     10+max(25)+15 = 50 */
+	/* AH:      9+max(25)+15 = 49 */
+	/* unknown: 10 */
+
+	/* (ICMP allows recursion one level deep) */
+	/* maxlen =  IP + ICMP +  IP + max(TCP,UDP,ICMP,unknown) */
+	/* maxlen = 230+   91  + 230 + 252 = 803 */
+}
+
+static void dump_ipv4_mac_header(struct sbuff *m,
+			    const struct nf_loginfo *info,
+			    const struct sk_buff *skb)
+{
+	struct net_device *dev = skb->dev;
+	unsigned int logflags = 0;
+
+	if (info->type == NF_LOG_TYPE_LOG || info->type == NF_LOG_TYPE_RING)
+		logflags = info->u.log.logflags;
+
+	if (!(logflags & XT_LOG_MACDECODE))
+		goto fallback;
+
+	switch (dev->type) {
+	case ARPHRD_ETHER:
+		sb_add(m, "MACSRC=%pM MACDST=%pM MACPROTO=%04x ",
+		       eth_hdr(skb)->h_source, eth_hdr(skb)->h_dest,
+		       ntohs(eth_hdr(skb)->h_proto));
+		return;
+	default:
+		break;
+	}
+
+fallback:
+	sb_add(m, "MAC=");
+	if (dev->hard_header_len &&
+	    skb->mac_header != skb->network_header) {
+		const unsigned char *p = skb_mac_header(skb);
+		unsigned int i;
+
+		sb_add(m, "%02x", *p++);
+		for (i = 1; i < dev->hard_header_len; i++, p++)
+			sb_add(m, ":%02x", *p);
+	}
+	sb_add(m, " ");
+}
+
+static void
+log_packet_common(struct sbuff *m,
+		  u_int8_t pf,
+		  unsigned int hooknum,
+		  const struct sk_buff *skb,
+		  const struct net_device *in,
+		  const struct net_device *out,
+		  const struct nf_loginfo *loginfo,
+		  const char *prefix)
+{
+	if (loginfo->type == NF_LOG_TYPE_LOG)
+		sb_add(m, "<%d>", loginfo->u.log.level);
+
+	if (loginfo->u.log.logflags & XT_LOG_ADD_TIMESTAMP) {
+		static struct timespec tv;
+		unsigned int msec;
+
+		getnstimeofday(&tv);
+		msec = tv.tv_nsec;
+		do_div(msec, 1000000);
+		sb_add(m, "TIMESTAMP=%li.%03li ", tv.tv_sec, msec);		
+	}
+
+	sb_add(m, "%sIN=%s OUT=%s ", prefix, in ? in->name : "",
+	       out ? out->name : "");
+#ifdef CONFIG_BRIDGE_NETFILTER
+	if (skb->nf_bridge) {
+		const struct net_device *physindev;
+		const struct net_device *physoutdev;
+
+		physindev = skb->nf_bridge->physindev;
+		if (physindev && in != physindev)
+			sb_add(m, "PHYSIN=%s ", physindev->name);
+		physoutdev = skb->nf_bridge->physoutdev;
+		if (physoutdev && out != physoutdev)
+			sb_add(m, "PHYSOUT=%s ", physoutdev->name);
+	}
+#endif
+}
+
+
+static struct sbuff *ipt_log_packet(u_int8_t pf,
+	       unsigned int hooknum,
+	       const struct sk_buff *skb,
+	       const struct net_device *in,
+	       const struct net_device *out,
+	       const struct nf_loginfo *loginfo,
+	       const char *prefix)
+{
+	struct sbuff *m = sb_open();
+
+	if (!loginfo)
+		loginfo = &default_loginfo;
+
+	log_packet_common(m, pf, hooknum, skb, in, out, loginfo, prefix);
+
+	if (in != NULL)
+		dump_ipv4_mac_header(m, loginfo, skb);
+
+	dump_ipv4_packet(m, loginfo, skb, 0);
+
+	return m;
+}
+
+static void ipt_log_packet_logger(u_int8_t pf,
+	       unsigned int hooknum,
+	       const struct sk_buff *skb,
+	       const struct net_device *in,
+	       const struct net_device *out,
+	       const struct nf_loginfo *loginfo,
+	       const char *prefix)
+{
+	struct sbuff *m = ipt_log_packet(pf, hooknum, skb, in, out, loginfo, prefix);
+
+	sb_close(m);
+}
+
+#if IS_ENABLED(CONFIG_IPV6)
+/* One level of recursion won't kill us */
+static void dump_ipv6_packet(struct sbuff *m,
+			const struct nf_loginfo *info,
+			const struct sk_buff *skb, unsigned int ip6hoff,
+			int recurse)
+{
+	u_int8_t currenthdr;
+	int fragment;
+	struct ipv6hdr _ip6h;
+	const struct ipv6hdr *ih;
+	unsigned int ptr;
+	unsigned int hdrlen = 0;
+	unsigned int logflags;
+
+	if (info->type == NF_LOG_TYPE_LOG || info->type == NF_LOG_TYPE_RING)
+		logflags = info->u.log.logflags;
+	else
+		logflags = NF_LOG_MASK;
+
+	ih = skb_header_pointer(skb, ip6hoff, sizeof(_ip6h), &_ip6h);
+	if (ih == NULL) {
+		sb_add(m, "TRUNCATED");
+		return;
+	}
+
+	/* Max length: 88 "SRC=0000.0000.0000.0000.0000.0000.0000.0000 DST=0000.0000.0000.0000.0000.0000.0000.0000 " */
+	sb_add(m, "SRC=%pI6 DST=%pI6 ", &ih->saddr, &ih->daddr);
+
+	/* Max length: 44 "LEN=65535 TC=255 HOPLIMIT=255 FLOWLBL=FFFFF " */
+	sb_add(m, "LEN=%Zu TC=%u HOPLIMIT=%u FLOWLBL=%u ",
+	       ntohs(ih->payload_len) + sizeof(struct ipv6hdr),
+	       (ntohl(*(__be32 *)ih) & 0x0ff00000) >> 20,
+	       ih->hop_limit,
+	       (ntohl(*(__be32 *)ih) & 0x000fffff));
+
+	fragment = 0;
+	ptr = ip6hoff + sizeof(struct ipv6hdr);
+	currenthdr = ih->nexthdr;
+	while (currenthdr != NEXTHDR_NONE && ip6t_ext_hdr(currenthdr)) {
+		struct ipv6_opt_hdr _hdr;
+		const struct ipv6_opt_hdr *hp;
+
+		hp = skb_header_pointer(skb, ptr, sizeof(_hdr), &_hdr);
+		if (hp == NULL) {
+			sb_add(m, "TRUNCATED");
+			return;
+		}
+
+		/* Max length: 48 "OPT (...) " */
+		if (logflags & XT_LOG_IPOPT)
+			sb_add(m, "OPT ( ");
+
+		switch (currenthdr) {
+		case IPPROTO_FRAGMENT: {
+			struct frag_hdr _fhdr;
+			const struct frag_hdr *fh;
+
+			sb_add(m, "FRAG:");
+			fh = skb_header_pointer(skb, ptr, sizeof(_fhdr),
+						&_fhdr);
+			if (fh == NULL) {
+				sb_add(m, "TRUNCATED ");
+				return;
+			}
+
+			/* Max length: 6 "65535 " */
+			sb_add(m, "%u ", ntohs(fh->frag_off) & 0xFFF8);
+
+			/* Max length: 11 "INCOMPLETE " */
+			if (fh->frag_off & htons(0x0001))
+				sb_add(m, "INCOMPLETE ");
+
+			sb_add(m, "ID:%08x ", ntohl(fh->identification));
+
+			if (ntohs(fh->frag_off) & 0xFFF8)
+				fragment = 1;
+
+			hdrlen = 8;
+
+			break;
+		}
+		case IPPROTO_DSTOPTS:
+		case IPPROTO_ROUTING:
+		case IPPROTO_HOPOPTS:
+			if (fragment) {
+				if (logflags & XT_LOG_IPOPT)
+					sb_add(m, ")");
+				return;
+			}
+			hdrlen = ipv6_optlen(hp);
+			break;
+		/* Max Length */
+		case IPPROTO_AH:
+			if (logflags & XT_LOG_IPOPT) {
+				struct ip_auth_hdr _ahdr;
+				const struct ip_auth_hdr *ah;
+
+				/* Max length: 3 "AH " */
+				sb_add(m, "AH ");
+
+				if (fragment) {
+					sb_add(m, ")");
+					return;
+				}
+
+				ah = skb_header_pointer(skb, ptr, sizeof(_ahdr),
+							&_ahdr);
+				if (ah == NULL) {
+					/*
+					 * Max length: 26 "INCOMPLETE [65535
+					 *  bytes] )"
+					 */
+					sb_add(m, "INCOMPLETE [%u bytes] )",
+					       skb->len - ptr);
+					return;
+				}
+
+				/* Length: 15 "SPI=0xF1234567 */
+				sb_add(m, "SPI=0x%x ", ntohl(ah->spi));
+
+			}
+
+			hdrlen = (hp->hdrlen+2)<<2;
+			break;
+		case IPPROTO_ESP:
+			if (logflags & XT_LOG_IPOPT) {
+				struct ip_esp_hdr _esph;
+				const struct ip_esp_hdr *eh;
+
+				/* Max length: 4 "ESP " */
+				sb_add(m, "ESP ");
+
+				if (fragment) {
+					sb_add(m, ")");
+					return;
+				}
+
+				/*
+				 * Max length: 26 "INCOMPLETE [65535 bytes] )"
+				 */
+				eh = skb_header_pointer(skb, ptr, sizeof(_esph),
+							&_esph);
+				if (eh == NULL) {
+					sb_add(m, "INCOMPLETE [%u bytes] )",
+					       skb->len - ptr);
+					return;
+				}
+
+				/* Length: 16 "SPI=0xF1234567 )" */
+				sb_add(m, "SPI=0x%x )", ntohl(eh->spi));
+
+			}
+			return;
+		default:
+			/* Max length: 20 "Unknown Ext Hdr 255" */
+			sb_add(m, "Unknown Ext Hdr %u", currenthdr);
+			return;
+		}
+		if (logflags & XT_LOG_IPOPT)
+			sb_add(m, ") ");
+
+		currenthdr = hp->nexthdr;
+		ptr += hdrlen;
+	}
+
+	switch (currenthdr) {
+	case IPPROTO_TCP:
+		if (dump_tcp_header(m, skb, currenthdr, fragment, ptr,
+		    logflags))
+			return;
+	case IPPROTO_UDP:
+	case IPPROTO_UDPLITE:
+		if (dump_udp_header(m, skb, currenthdr, fragment, ptr))
+			return;
+	case IPPROTO_ICMPV6: {
+		struct icmp6hdr _icmp6h;
+		const struct icmp6hdr *ic;
+
+		/* Max length: 13 "PROTO=ICMPv6 " */
+		sb_add(m, "PROTO=ICMPv6 ");
+
+		if (fragment)
+			break;
+
+		/* Max length: 25 "INCOMPLETE [65535 bytes] " */
+		ic = skb_header_pointer(skb, ptr, sizeof(_icmp6h), &_icmp6h);
+		if (ic == NULL) {
+			sb_add(m, "INCOMPLETE [%u bytes] ", skb->len - ptr);
+			return;
+		}
+
+		/* Max length: 18 "TYPE=255 CODE=255 " */
+		sb_add(m, "TYPE=%u CODE=%u ", ic->icmp6_type, ic->icmp6_code);
+
+		switch (ic->icmp6_type) {
+		case ICMPV6_ECHO_REQUEST:
+		case ICMPV6_ECHO_REPLY:
+			/* Max length: 19 "ID=65535 SEQ=65535 " */
+			sb_add(m, "ID=%u SEQ=%u ",
+				ntohs(ic->icmp6_identifier),
+				ntohs(ic->icmp6_sequence));
+			break;
+		case ICMPV6_MGM_QUERY:
+		case ICMPV6_MGM_REPORT:
+		case ICMPV6_MGM_REDUCTION:
+			break;
+
+		case ICMPV6_PARAMPROB:
+			/* Max length: 17 "POINTER=ffffffff " */
+			sb_add(m, "POINTER=%08x ", ntohl(ic->icmp6_pointer));
+			/* Fall through */
+		case ICMPV6_DEST_UNREACH:
+		case ICMPV6_PKT_TOOBIG:
+		case ICMPV6_TIME_EXCEED:
+			/* Max length: 3+maxlen */
+			if (recurse) {
+				sb_add(m, "[");
+				dump_ipv6_packet(m, info, skb,
+					    ptr + sizeof(_icmp6h), 0);
+				sb_add(m, "] ");
+			}
+
+			/* Max length: 10 "MTU=65535 " */
+			if (ic->icmp6_type == ICMPV6_PKT_TOOBIG)
+				sb_add(m, "MTU=%u ", ntohl(ic->icmp6_mtu));
+		}
+		break;
+	}
+	/* Max length: 10 "PROTO=255 " */
+	default:
+		sb_add(m, "PROTO=%u ", currenthdr);
+	}
+
+	/* Max length: 15 "UID=4294967295 " */
+	if ((logflags & XT_LOG_UID) && recurse && skb->sk) {
+		read_lock_bh(&skb->sk->sk_callback_lock);
+		if (skb->sk->sk_socket && skb->sk->sk_socket->file)
+			sb_add(m, "UID=%u GID=%u ",
+				skb->sk->sk_socket->file->f_cred->fsuid,
+				skb->sk->sk_socket->file->f_cred->fsgid);
+		read_unlock_bh(&skb->sk->sk_callback_lock);
+	}
+
+	/* Max length: 16 "MARK=0xFFFFFFFF " */
+	if (!recurse && skb->mark)
+		sb_add(m, "MARK=0x%x ", skb->mark);
+}
+
+static void dump_ipv6_mac_header(struct sbuff *m,
+			    const struct nf_loginfo *info,
+			    const struct sk_buff *skb)
+{
+	struct net_device *dev = skb->dev;
+	unsigned int logflags = 0;
+
+	if (info->type == NF_LOG_TYPE_LOG || info->type == NF_LOG_TYPE_RING)
+		logflags = info->u.log.logflags;
+
+	if (!(logflags & XT_LOG_MACDECODE))
+		goto fallback;
+
+	switch (dev->type) {
+	case ARPHRD_ETHER:
+		sb_add(m, "MACSRC=%pM MACDST=%pM MACPROTO=%04x ",
+		       eth_hdr(skb)->h_source, eth_hdr(skb)->h_dest,
+		       ntohs(eth_hdr(skb)->h_proto));
+		return;
+	default:
+		break;
+	}
+
+fallback:
+	sb_add(m, "MAC=");
+	if (dev->hard_header_len &&
+	    skb->mac_header != skb->network_header) {
+		const unsigned char *p = skb_mac_header(skb);
+		unsigned int len = dev->hard_header_len;
+		unsigned int i;
+
+		if (dev->type == ARPHRD_SIT) {
+			p -= ETH_HLEN;
+
+			if (p < skb->head)
+				p = NULL;
+		}
+
+		if (p != NULL) {
+			sb_add(m, "%02x", *p++);
+			for (i = 1; i < len; i++)
+				sb_add(m, ":%02x", *p++);
+		}
+		sb_add(m, " ");
+
+		if (dev->type == ARPHRD_SIT) {
+			const struct iphdr *iph =
+				(struct iphdr *)skb_mac_header(skb);
+			sb_add(m, "TUNNEL=%pI4->%pI4 ", &iph->saddr,
+			       &iph->daddr);
+		}
+	} else
+		sb_add(m, " ");
+}
+
+static struct sbuff *ip6t_log_packet(u_int8_t pf,
+		unsigned int hooknum,
+		const struct sk_buff *skb,
+		const struct net_device *in,
+		const struct net_device *out,
+		const struct nf_loginfo *loginfo,
+		const char *prefix)
+{
+	struct sbuff *m = sb_open();
+
+	if (!loginfo)
+		loginfo = &default_loginfo;
+
+	log_packet_common(m, pf, hooknum, skb, in, out, loginfo, prefix);
+
+	if (in != NULL)
+		dump_ipv6_mac_header(m, loginfo, skb);
+
+	dump_ipv6_packet(m, loginfo, skb, skb_network_offset(skb), 1);
+
+	return m;
+}
+
+static void ip6t_log_packet_logger(u_int8_t pf,
+	       unsigned int hooknum,
+	       const struct sk_buff *skb,
+	       const struct net_device *in,
+	       const struct net_device *out,
+	       const struct nf_loginfo *loginfo,
+	       const char *prefix)
+{
+	struct sbuff *m = ip6t_log_packet(pf, hooknum, skb, in, out, loginfo, prefix);
+
+	sb_close(m);
+}
+#endif
+
+static unsigned int
+log_tg(struct sk_buff *skb, const struct xt_action_param *par)
+{
+	const struct xt_log_info *loginfo = par->targinfo;
+	struct nf_loginfo li;
+	struct sbuff *m;
+
+	li.type = NF_LOG_TYPE_LOG;
+	li.u.log.level = loginfo->level;
+	li.u.log.logflags = loginfo->logflags;
+
+	if (par->family == NFPROTO_IPV4)
+		m = ipt_log_packet(NFPROTO_IPV4, par->hooknum, skb, par->in,
+				   par->out, &li, loginfo->prefix);
+#if IS_ENABLED(CONFIG_IPV6)
+	else if (par->family == NFPROTO_IPV6)
+		m = ip6t_log_packet(NFPROTO_IPV6, par->hooknum, skb, par->in,
+				    par->out, &li, loginfo->prefix);
+#endif
+	else
+		BUG();
+
+	sb_close(m);
+
+	return XT_CONTINUE;
+}
+
+static int log_tg_check(const struct xt_tgchk_param *par)
+{
+	const struct xt_log_info *loginfo = par->targinfo;
+
+	if (par->family != NFPROTO_IPV4 && par->family != NFPROTO_IPV6)
+		return -EINVAL;
+
+	if (loginfo->level >= 8) {
+		pr_debug("level %u >= 8\n", loginfo->level);
+		return -EINVAL;
+	}
+
+	if (loginfo->prefix[sizeof(loginfo->prefix)-1] != '\0') {
+		pr_debug("prefix is not null-terminated\n");
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static unsigned int
+log_tg_v1(struct sk_buff *skb, const struct xt_action_param *par)
+{
+	const struct xt_log_info_v1 *loginfo = par->targinfo;
+	struct nf_loginfo li;
+	struct sbuff *m;
+
+#ifdef CONFIG_NETFILTER_XT_TARGET_LOG_RING
+	if (loginfo->ring_size)
+		li.type = NF_LOG_TYPE_RING;
+	else
+#endif
+		li.type = NF_LOG_TYPE_LOG;
+
+	li.u.log.level = loginfo->level;
+	li.u.log.logflags = loginfo->logflags;
+
+	if (par->family == NFPROTO_IPV4)
+		m = ipt_log_packet(NFPROTO_IPV4, par->hooknum, skb, par->in,
+				   par->out, &li, loginfo->prefix);
+#if IS_ENABLED(CONFIG_IPV6)
+	else if (par->family == NFPROTO_IPV6)
+		m = ip6t_log_packet(NFPROTO_IPV6, par->hooknum, skb, par->in,
+				    par->out, &li, loginfo->prefix);
+#endif
+	else
+		BUG();
+
+#ifdef CONFIG_NETFILTER_XT_TARGET_LOG_RING
+	if (loginfo->ring_size) {
+		sb_add(m, "\n");
+		xt_LOG_ring_add_record(loginfo->rctx, m->buf, m->count);
+		__sb_close(m, 0);
+	}
+	else
+#endif
+		sb_close(m);
+
+	return XT_CONTINUE;
+}
+
+static int log_tg_check_v1(const struct xt_tgchk_param *par)
+{
+	struct xt_log_info_v1 *loginfo = par->targinfo;
+
+	if (par->family != NFPROTO_IPV4 && par->family != NFPROTO_IPV6)
+		return -EINVAL;
+
+	if (loginfo->level >= 8) {
+		pr_debug("level %u >= 8\n", loginfo->level);
+		return -EINVAL;
+	}
+
+	if (loginfo->prefix[sizeof(loginfo->prefix)-1] != '\0') {
+		pr_debug("prefix is not null-terminated\n");
+		return -EINVAL;
+	}
+
+	/* a non-empty ring_size indicates that we're using ring_buffer */
+	if (loginfo->ring_size) {
+#ifdef CONFIG_NETFILTER_XT_TARGET_LOG_RING
+		int i;
+		struct xt_LOG_ring_ctx *rctx;
+
+		if (loginfo->ring_name[sizeof(loginfo->ring_name)-1] != '\0') {
+			pr_debug("ring_name is not null-terminated\n");
+			return -EINVAL;
+		}
+
+		if (!loginfo->ring_name[0]) {
+			pr_debug("ring_name is empty\n");
+			return -EINVAL;
+		}
+
+		for (i = 0; i < strlen(loginfo->ring_name); i++) {
+			if (!isalnum(loginfo->ring_name[i])) {
+				pr_debug("ring_name contains "
+					 "a non-alphanumeric character\n");
+				return -EINVAL;
+			}
+		}
+
+		rctx = xt_LOG_ring_find_ctx(loginfo->ring_name);
+		if (!rctx) {
+			rctx = xt_LOG_ring_new_ctx(loginfo->ring_name,
+			       loginfo->ring_size);
+			if (IS_ERR(rctx))
+				return PTR_ERR(rctx);
+		}
+
+		xt_LOG_ring_get(rctx);
+		loginfo->rctx = rctx;
+#else
+		pr_debug("Sorry, this kernel was built without CONFIG_NETFILTER_XT_TARGET_LOG_RING\n");
+		return -EINVAL;
+#endif
+	}
+
+	return 0;
+}
+
+static void log_tg_destroy_v1(const struct xt_tgdtor_param *par)
+{
+#ifdef CONFIG_NETFILTER_XT_TARGET_LOG_RING
+	const struct xt_log_info_v1 *loginfo = par->targinfo;
+	struct xt_LOG_ring_ctx *rctx = loginfo->rctx;
+
+	if (loginfo->ring_size)
+		xt_LOG_ring_put(rctx);
+#endif
+}
+
+static struct xt_target log_tg_regs[] __read_mostly = {
+	{
+		.name		= "LOG",
+		.family		= NFPROTO_IPV4,
+		.revision	= 0,
+		.target		= log_tg,
+		.targetsize	= sizeof(struct xt_log_info),
+		.checkentry	= log_tg_check,
+		.me		= THIS_MODULE,
+	},
+	{
+		.name		= "LOG",
+		.family		= NFPROTO_IPV4,
+		.revision	= 1,
+		.target		= log_tg_v1,
+		.targetsize	= sizeof(struct xt_log_info_v1),
+		.checkentry	= log_tg_check_v1,
+		.destroy	= log_tg_destroy_v1,
+		.me		= THIS_MODULE,
+	},
+#if IS_ENABLED(CONFIG_IPV6)
+	{
+		.name		= "LOG",
+		.family		= NFPROTO_IPV6,
+		.revision	= 0,
+		.target		= log_tg,
+		.targetsize	= sizeof(struct xt_log_info),
+		.checkentry	= log_tg_check,
+		.me		= THIS_MODULE,
+	},
+	{
+		.name		= "LOG",
+		.family		= NFPROTO_IPV6,
+		.revision	= 1,
+		.target		= log_tg_v1,
+		.targetsize	= sizeof(struct xt_log_info_v1),
+		.checkentry	= log_tg_check_v1,
+		.destroy	= log_tg_destroy_v1,
+		.me		= THIS_MODULE,
+	},
+#endif
+};
+
+static struct nf_logger ipt_log_logger __read_mostly = {
+	.name		= "ipt_LOG",
+	.logfn		= &ipt_log_packet_logger,
+	.me		= THIS_MODULE,
+};
+
+#if IS_ENABLED(CONFIG_IPV6)
+static struct nf_logger ip6t_log_logger __read_mostly = {
+	.name		= "ip6t_LOG",
+	.logfn		= &ip6t_log_packet_logger,
+	.me		= THIS_MODULE,
+};
+#endif
+
+static int __init log_tg_init(void)
+{
+	int ret;
+
+	ret = xt_LOG_ring_init();
+	if (ret < 0)
+		return ret;
+
+	ret = xt_register_targets(log_tg_regs, ARRAY_SIZE(log_tg_regs));
+	if (ret < 0)
+		return ret;
+
+	nf_log_register(NFPROTO_IPV4, &ipt_log_logger);
+#if IS_ENABLED(CONFIG_IPV6)
+	nf_log_register(NFPROTO_IPV6, &ip6t_log_logger);
+#endif
+	return 0;
+}
+
+static void __exit log_tg_exit(void)
+{
+	nf_log_unregister(&ipt_log_logger);
+#if IS_ENABLED(CONFIG_IPV6)
+	nf_log_unregister(&ip6t_log_logger);
+#endif
+	xt_unregister_targets(log_tg_regs, ARRAY_SIZE(log_tg_regs));
+	xt_LOG_ring_exit();
+}
+
+module_init(log_tg_init);
+module_exit(log_tg_exit);
diff --git a/net/netfilter/xt_LOG_ring.c b/net/netfilter/xt_LOG_ring.c
new file mode 100644
index 0000000..cd1d871
--- /dev/null
+++ b/net/netfilter/xt_LOG_ring.c
@@ -0,0 +1,430 @@
+/*
+ * Copyright (c) 2012 Richard Weinberger <richard@nod.at>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ */
+
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/ring_buffer.h>
+#include <linux/cpu.h>
+#include <linux/slab.h>
+#include <linux/uaccess.h>
+#include <linux/fs.h>
+#include <linux/poll.h>
+#include <linux/proc_fs.h>
+#include <linux/wait.h>
+#include <linux/time.h>
+#include <linux/sched.h>
+#include <linux/list.h>
+#include <linux/atomic.h>
+#include <linux/spinlock.h>
+#include <linux/mutex.h>
+#include <linux/netfilter.h>
+
+#define TARGETNAME_LEN		32
+#define ME			"xt_LOG_ring"
+
+struct xt_LOG_ring_ctx {
+	char name[TARGETNAME_LEN];
+	struct ring_buffer *buffer;
+	atomic_t pipe_in_use;
+	atomic_t refcnt;
+
+	struct list_head list;
+};
+
+struct rlog_entry {
+	size_t count;
+	char msg[0];
+};
+
+struct rlog_iter {
+	struct ring_buffer *buffer;
+	const char *buffer_name;
+	struct rlog_entry *ent;
+
+	char print_buf[PAGE_SIZE];
+	size_t print_buf_len;
+	size_t print_buf_pos;
+
+	unsigned long lost_events;
+	int cpu;
+
+	struct mutex lock;
+};
+
+static DEFINE_SPINLOCK(target_list_lock);
+static LIST_HEAD(target_list);
+static DECLARE_WAIT_QUEUE_HEAD(rlog_wait);
+static struct proc_dir_entry *prlog;
+
+static void wakeup_work_handler(struct work_struct *work)
+{
+	wake_up(&rlog_wait);
+}
+
+static DECLARE_WORK(wakeup_work, wakeup_work_handler);
+
+static void rlog_wake_up(void)
+{
+	schedule_work(&wakeup_work);
+}
+
+int xt_LOG_ring_add_record(struct xt_LOG_ring_ctx *rctx, const char *buf, unsigned int len)
+{
+	struct rlog_entry *entry;
+	struct ring_buffer_event *event;
+
+	event = ring_buffer_lock_reserve(rctx->buffer, sizeof(*entry) + len);
+	if (!event)
+		return 1;
+
+	entry = ring_buffer_event_data(event);
+	memcpy(entry->msg, buf, len);
+	entry->count = len;
+
+	ring_buffer_unlock_commit(rctx->buffer, event);
+	rlog_wake_up();
+
+	return 0;
+}
+
+static struct rlog_entry *peek_next_entry(struct rlog_iter *iter, int cpu,
+					  unsigned long long *ts)
+{
+	struct ring_buffer_event *event;
+
+	event = ring_buffer_peek(iter->buffer, cpu, ts, &iter->lost_events);
+
+	if (event)
+		return ring_buffer_event_data(event);
+
+	return NULL;
+}
+
+static struct rlog_entry *find_next_entry(struct rlog_iter *iter)
+{
+	struct rlog_entry *ent, *next = NULL;
+	unsigned long long next_ts = 0, ts;
+	int cpu, next_cpu = -1;
+
+	for_each_buffer_cpu (iter->buffer, cpu) {
+		if (ring_buffer_empty_cpu(iter->buffer, cpu))
+			continue;
+
+		ent = peek_next_entry(iter, cpu, &ts);
+
+		if (ent && (!next || ts < next_ts)) {
+			next = ent;
+			next_cpu = cpu;
+			next_ts = ts;
+		}
+	}
+
+	iter->cpu = next_cpu;
+
+	return next;
+}
+
+static struct rlog_iter *find_next_entry_inc(struct rlog_iter *iter)
+{
+	iter->ent = find_next_entry(iter);
+
+	if (iter->ent)
+		return iter;
+
+	return NULL;
+}
+
+static int buffer_empty(struct rlog_iter *iter)
+{
+	int cpu;
+
+	for_each_buffer_cpu (iter->buffer, cpu) {
+		if (!ring_buffer_empty_cpu(iter->buffer, cpu))
+			return 0;
+	}
+
+	return 1;
+}
+
+static ssize_t rlog_to_user(struct rlog_iter *iter, char __user *ubuf,
+			    size_t cnt)
+{
+	int ret;
+	int len;
+
+	if (!cnt)
+		goto out;
+
+	len = iter->print_buf_len - iter->print_buf_pos;
+	if (len < 1)
+		return -EBUSY;
+
+	if (cnt > len)
+		cnt = len;
+
+	ret = copy_to_user(ubuf, iter->print_buf + iter->print_buf_pos, cnt);
+	if (ret == cnt)
+		return -EFAULT;
+
+	cnt -= ret;
+	iter->print_buf_pos += cnt;
+
+out:
+	return cnt;
+}
+
+static int rlog_open_pipe(struct inode *inode, struct file *file)
+{
+	struct rlog_iter *iter;
+	struct xt_LOG_ring_ctx *tgt = PDE(inode)->data;
+	int ret = 0;
+
+	/* only one consuming reader is allowed */
+	if (atomic_cmpxchg(&tgt->pipe_in_use, 0, 1)) {
+		ret = -EBUSY;
+		goto out;
+	}
+
+	iter = kzalloc(sizeof(*iter), GFP_KERNEL);
+	if (!iter) {
+		ret = -ENOMEM;
+		goto out;
+	}
+
+	mutex_init(&iter->lock);
+	iter->buffer = tgt->buffer;
+	iter->buffer_name = tgt->name;
+
+	file->private_data = iter;
+out:
+	return ret;
+}
+
+static unsigned int rlog_poll_pipe(struct file *file, poll_table *poll_table)
+{
+	struct rlog_iter *iter = file->private_data;
+
+	if (!buffer_empty(iter))
+		return POLLIN | POLLRDNORM;
+
+	poll_wait(file, &rlog_wait, poll_table);
+
+	if (!buffer_empty(iter))
+		return POLLIN | POLLRDNORM;
+
+	return 0;
+}
+
+static int rlog_release_pipe(struct inode *inode, struct file *file)
+{
+	struct rlog_iter *iter = file->private_data;
+	struct xt_LOG_ring_ctx *tgt = PDE(inode)->data;
+
+	mutex_destroy(&iter->lock);
+	kfree(iter);
+	atomic_set(&tgt->pipe_in_use, 0);
+
+	return 0;
+}
+
+static void wait_pipe(struct rlog_iter *iter)
+{
+	DEFINE_WAIT(wait);
+
+	prepare_to_wait(&rlog_wait, &wait, TASK_INTERRUPTIBLE);
+
+	if (buffer_empty(iter))
+		schedule();
+
+	finish_wait(&rlog_wait, &wait);
+}
+
+static int rlog_wait_pipe(struct file *file)
+{
+	struct rlog_iter *iter = file->private_data;
+
+	while (buffer_empty(iter)) {
+		if (file->f_flags & O_NONBLOCK)
+			return -EAGAIN;
+
+		mutex_unlock(&iter->lock);
+
+		wait_pipe(iter);
+
+		mutex_lock(&iter->lock);
+
+		if (signal_pending(current))
+			return -EINTR;
+	}
+
+	return 1;
+}
+
+static ssize_t rlog_read_pipe(struct file *file, char __user *ubuf,
+			      size_t cnt, loff_t *ppos)
+{
+	struct rlog_iter *iter = file->private_data;
+	ssize_t ret;
+
+	ret = rlog_to_user(iter, ubuf, cnt);
+	if (ret != -EBUSY)
+		goto out;
+
+	iter->print_buf_pos = 0;
+	iter->print_buf_len = 0;
+
+	if (cnt >= PAGE_SIZE)
+		cnt = PAGE_SIZE - 1;
+
+	mutex_lock(&iter->lock);
+again:
+	ret = rlog_wait_pipe(file);
+	if (ret <= 0)
+		goto out_unlock;
+
+	while (find_next_entry_inc(iter) != NULL) {
+		struct rlog_entry *ent;
+		ent = iter->ent;
+
+		if (ent->count >= PAGE_SIZE - iter->print_buf_len)
+			break;
+
+		memcpy(iter->print_buf + iter->print_buf_len, ent->msg,
+			ent->count);
+		iter->print_buf_len += ent->count;
+
+		ring_buffer_consume(iter->buffer, iter->cpu, NULL,
+			&iter->lost_events);
+		if (iter->lost_events)
+			printk(KERN_WARNING ME ": Ring %s "
+				"lost %lu events\n", iter->buffer_name,
+				iter->lost_events);
+
+		if (iter->print_buf_len >= cnt)
+			break;
+	}
+
+	ret = rlog_to_user(iter, ubuf, cnt);
+
+	if (iter->print_buf_pos >= iter->print_buf_len) {
+		iter->print_buf_pos = 0;
+		iter->print_buf_len = 0;
+	}
+
+	if (ret == -EBUSY)
+		goto again;
+out_unlock:
+	mutex_unlock(&iter->lock);
+out:
+	return ret;
+}
+
+static const struct file_operations rlog_pipe_fops = {
+	.open		= rlog_open_pipe,
+	.poll		= rlog_poll_pipe,
+	.read		= rlog_read_pipe,
+	.release	= rlog_release_pipe,
+	.llseek		= no_llseek,
+};
+
+struct xt_LOG_ring_ctx *xt_LOG_ring_new_ctx(const char *name, size_t rb_size)
+{
+	struct xt_LOG_ring_ctx *new;
+
+	new = kmalloc(sizeof(*new), GFP_KERNEL);
+	if (!new) {
+		new = ERR_PTR(-ENOMEM);
+
+		goto out;
+	}
+
+	new->buffer = ring_buffer_alloc(rb_size << 10, RB_FL_OVERWRITE);
+	if (!new->buffer) {
+		kfree(new);
+		new = ERR_PTR(-ENOMEM);
+
+		goto out;
+	}
+
+	strlcpy(new->name, name, TARGETNAME_LEN);
+
+	if (!proc_create_data(name, 0400, prlog, &rlog_pipe_fops, new)) {
+		ring_buffer_free(new->buffer);
+		kfree(new);
+		new = ERR_PTR(-ENOMEM);
+
+		goto out;
+	}
+
+	atomic_set(&new->pipe_in_use, 0);
+	atomic_set(&new->refcnt, 0);
+
+	spin_lock(&target_list_lock);
+	list_add(&new->list, &target_list);
+	spin_unlock(&target_list_lock);
+out:
+	return new;
+}
+
+static void free_xt_LOG_ring_ctx(struct xt_LOG_ring_ctx *target)
+{
+	remove_proc_entry(target->name, prlog);
+	ring_buffer_free(target->buffer);
+	list_del(&target->list);
+	kfree(target);
+}
+
+void xt_LOG_ring_get(struct xt_LOG_ring_ctx *ctx)
+{
+	atomic_inc(&ctx->refcnt);
+}
+
+void xt_LOG_ring_put(struct xt_LOG_ring_ctx *ctx)
+{
+	if (atomic_dec_and_test(&ctx->refcnt))
+		free_xt_LOG_ring_ctx(ctx);
+}
+
+struct xt_LOG_ring_ctx *xt_LOG_ring_find_ctx(const char *name)
+{
+	struct list_head *e;
+	struct xt_LOG_ring_ctx *tmp, *victim = NULL;
+
+	spin_lock(&target_list_lock);
+
+	list_for_each(e, &target_list) {
+		tmp = list_entry(e, struct xt_LOG_ring_ctx, list);
+		if (strcmp(tmp->name, name) == 0) {
+			victim = tmp;
+
+			goto out;
+		}
+	}
+
+out:
+	spin_unlock(&target_list_lock);
+
+	return victim;
+}
+
+void __exit xt_LOG_ring_exit(void)
+{
+	BUG_ON(!list_empty(&target_list));
+	remove_proc_entry(ME, proc_net_netfilter);
+}
+
+int __init xt_LOG_ring_init(void)
+{
+	prlog = proc_mkdir(ME, proc_net_netfilter);
+	if (!prlog)
+		return -ENOMEM;
+
+	return 0;
+}
-- 
1.7.7


^ permalink raw reply related	[flat|nested] 15+ messages in thread

* [PATCH 5/6] iptables: Merge libip6t_LOG and libipt_LOG into libxt_LOG
  2012-01-22 21:56 [PATCH v2] Merge ipt_LOG and ip6t_LOG, add ring bufffer support Richard Weinberger
                   ` (3 preceding siblings ...)
  2012-01-22 21:56 ` [PATCH 4/6] Netfilter: xt_LOG: Implement ring buffer support Richard Weinberger
@ 2012-01-22 21:56 ` Richard Weinberger
  2012-01-22 21:56 ` [PATCH 6/6] iptables: xt_LOG: Add ring buffer support Richard Weinberger
  5 siblings, 0 replies; 15+ messages in thread
From: Richard Weinberger @ 2012-01-22 21:56 UTC (permalink / raw)
  To: netfilter-devel
  Cc: netdev, linux-kernel, eric.dumazet, jengelh, Richard Weinberger

libip6t_LOG and libipt_LOG share a lot of common code, merge them
to recude duplicate code.

Signed-off-by: Richard Weinberger <richard@nod.at>
---
 extensions/libip6t_LOG.c         |  184 ----------------------------------
 extensions/libip6t_LOG.man       |   31 ------
 extensions/libipt_LOG.c          |  186 -----------------------------------
 extensions/libipt_LOG.man        |   31 ------
 extensions/libxt_LOG.c           |  201 ++++++++++++++++++++++++++++++++++++++
 extensions/libxt_LOG.man         |   31 ++++++
 include/linux/netfilter/xt_LOG.h |   19 ++++
 7 files changed, 251 insertions(+), 432 deletions(-)
 delete mode 100644 extensions/libip6t_LOG.c
 delete mode 100644 extensions/libip6t_LOG.man
 delete mode 100644 extensions/libipt_LOG.c
 delete mode 100644 extensions/libipt_LOG.man
 create mode 100644 extensions/libxt_LOG.c
 create mode 100644 extensions/libxt_LOG.man
 create mode 100644 include/linux/netfilter/xt_LOG.h

diff --git a/extensions/libip6t_LOG.c b/extensions/libip6t_LOG.c
deleted file mode 100644
index 2b1ae28..0000000
--- a/extensions/libip6t_LOG.c
+++ /dev/null
@@ -1,184 +0,0 @@
-#include <stdio.h>
-#include <string.h>
-#include <syslog.h>
-#include <xtables.h>
-#include <linux/netfilter_ipv6/ip6t_LOG.h>
-
-#ifndef IP6T_LOG_UID	/* Old kernel */
-#define IP6T_LOG_UID	0x08
-#undef  IP6T_LOG_MASK
-#define IP6T_LOG_MASK	0x0f
-#endif
-
-#define LOG_DEFAULT_LEVEL LOG_WARNING
-
-enum {
-	O_LOG_LEVEL = 0,
-	O_LOG_PREFIX,
-	O_LOG_TCPSEQ,
-	O_LOG_TCPOPTS,
-	O_LOG_IPOPTS,
-	O_LOG_UID,
-	O_LOG_MAC,
-};
-
-static void LOG_help(void)
-{
-	printf(
-"LOG target options:\n"
-" --log-level level		Level of logging (numeric or see syslog.conf)\n"
-" --log-prefix prefix		Prefix log messages with this prefix.\n"
-" --log-tcp-sequence		Log TCP sequence numbers.\n"
-" --log-tcp-options		Log TCP options.\n"
-" --log-ip-options		Log IP options.\n"
-" --log-uid			Log UID owning the local socket.\n"
-" --log-macdecode		Decode MAC addresses and protocol.\n");
-}
-
-#define s struct ip6t_log_info
-static const struct xt_option_entry LOG_opts[] = {
-	{.name = "log-level", .id = O_LOG_LEVEL, .type = XTTYPE_SYSLOGLEVEL,
-	 .flags = XTOPT_PUT, XTOPT_POINTER(s, level)},
-	{.name = "log-prefix", .id = O_LOG_PREFIX, .type = XTTYPE_STRING,
-	 .flags = XTOPT_PUT, XTOPT_POINTER(s, prefix), .min = 1},
-	{.name = "log-tcp-sequence", .id = O_LOG_TCPSEQ, .type = XTTYPE_NONE},
-	{.name = "log-tcp-options", .id = O_LOG_TCPOPTS, .type = XTTYPE_NONE},
-	{.name = "log-ip-options", .id = O_LOG_IPOPTS, .type = XTTYPE_NONE},
-	{.name = "log-uid", .id = O_LOG_UID, .type = XTTYPE_NONE},
-	{.name = "log-macdecode", .id = O_LOG_MAC, .type = XTTYPE_NONE},
-	XTOPT_TABLEEND,
-};
-#undef s
-
-static void LOG_init(struct xt_entry_target *t)
-{
-	struct ip6t_log_info *loginfo = (struct ip6t_log_info *)t->data;
-
-	loginfo->level = LOG_DEFAULT_LEVEL;
-
-}
-
-struct ip6t_log_names {
-	const char *name;
-	unsigned int level;
-};
-
-static const struct ip6t_log_names ip6t_log_names[]
-= { { .name = "alert",   .level = LOG_ALERT },
-    { .name = "crit",    .level = LOG_CRIT },
-    { .name = "debug",   .level = LOG_DEBUG },
-    { .name = "emerg",   .level = LOG_EMERG },
-    { .name = "error",   .level = LOG_ERR },		/* DEPRECATED */
-    { .name = "info",    .level = LOG_INFO },
-    { .name = "notice",  .level = LOG_NOTICE },
-    { .name = "panic",   .level = LOG_EMERG },		/* DEPRECATED */
-    { .name = "warning", .level = LOG_WARNING }
-};
-
-static void LOG_parse(struct xt_option_call *cb)
-{
-	struct ip6t_log_info *info = cb->data;
-
-	xtables_option_parse(cb);
-	switch (cb->entry->id) {
-	case O_LOG_PREFIX:
-		if (strchr(cb->arg, '\n') != NULL)
-			xtables_error(PARAMETER_PROBLEM,
-				   "Newlines not allowed in --log-prefix");
-		break;
-	case O_LOG_TCPSEQ:
-		info->logflags |= IP6T_LOG_TCPSEQ;
-		break;
-	case O_LOG_TCPOPTS:
-		info->logflags |= IP6T_LOG_TCPOPT;
-		break;
-	case O_LOG_IPOPTS:
-		info->logflags |= IP6T_LOG_IPOPT;
-		break;
-	case O_LOG_UID:
-		info->logflags |= IP6T_LOG_UID;
-		break;
-	case O_LOG_MAC:
-		info->logflags |= IP6T_LOG_MACDECODE;
-		break;
-	}
-}
-
-static void LOG_print(const void *ip, const struct xt_entry_target *target,
-                      int numeric)
-{
-	const struct ip6t_log_info *loginfo
-		= (const struct ip6t_log_info *)target->data;
-	unsigned int i = 0;
-
-	printf(" LOG");
-	if (numeric)
-		printf(" flags %u level %u",
-		       loginfo->logflags, loginfo->level);
-	else {
-		for (i = 0; i < ARRAY_SIZE(ip6t_log_names); ++i)
-			if (loginfo->level == ip6t_log_names[i].level) {
-				printf(" level %s", ip6t_log_names[i].name);
-				break;
-			}
-		if (i == ARRAY_SIZE(ip6t_log_names))
-			printf(" UNKNOWN level %u", loginfo->level);
-		if (loginfo->logflags & IP6T_LOG_TCPSEQ)
-			printf(" tcp-sequence");
-		if (loginfo->logflags & IP6T_LOG_TCPOPT)
-			printf(" tcp-options");
-		if (loginfo->logflags & IP6T_LOG_IPOPT)
-			printf(" ip-options");
-		if (loginfo->logflags & IP6T_LOG_UID)
-			printf(" uid");
-		if (loginfo->logflags & IP6T_LOG_MACDECODE)
-			printf(" macdecode");
-		if (loginfo->logflags & ~(IP6T_LOG_MASK))
-			printf(" unknown-flags");
-	}
-
-	if (strcmp(loginfo->prefix, "") != 0)
-		printf(" prefix \"%s\"", loginfo->prefix);
-}
-
-static void LOG_save(const void *ip, const struct xt_entry_target *target)
-{
-	const struct ip6t_log_info *loginfo
-		= (const struct ip6t_log_info *)target->data;
-
-	if (strcmp(loginfo->prefix, "") != 0)
-		printf(" --log-prefix \"%s\"", loginfo->prefix);
-
-	if (loginfo->level != LOG_DEFAULT_LEVEL)
-		printf(" --log-level %d", loginfo->level);
-
-	if (loginfo->logflags & IP6T_LOG_TCPSEQ)
-		printf(" --log-tcp-sequence");
-	if (loginfo->logflags & IP6T_LOG_TCPOPT)
-		printf(" --log-tcp-options");
-	if (loginfo->logflags & IP6T_LOG_IPOPT)
-		printf(" --log-ip-options");
-	if (loginfo->logflags & IP6T_LOG_UID)
-		printf(" --log-uid");
-	if (loginfo->logflags & IP6T_LOG_MACDECODE)
-		printf(" --log-macdecode");
-}
-
-static struct xtables_target log_tg6_reg = {
-	.name          = "LOG",
-	.version       = XTABLES_VERSION,
-	.family        = NFPROTO_IPV6,
-	.size          = XT_ALIGN(sizeof(struct ip6t_log_info)),
-	.userspacesize = XT_ALIGN(sizeof(struct ip6t_log_info)),
-	.help          = LOG_help,
-	.init          = LOG_init,
-	.print         = LOG_print,
-	.save          = LOG_save,
-	.x6_parse      = LOG_parse,
-	.x6_options    = LOG_opts,
-};
-
-void _init(void)
-{
-	xtables_register_target(&log_tg6_reg);
-}
diff --git a/extensions/libip6t_LOG.man b/extensions/libip6t_LOG.man
deleted file mode 100644
index b7803fe..0000000
--- a/extensions/libip6t_LOG.man
+++ /dev/null
@@ -1,31 +0,0 @@
-Turn on kernel logging of matching packets.  When this option is set
-for a rule, the Linux kernel will print some information on all
-matching packets (like most IPv6 IPv6-header fields) via the kernel log
-(where it can be read with
-.I dmesg
-or 
-.IR syslogd (8)).
-This is a "non-terminating target", i.e. rule traversal continues at
-the next rule.  So if you want to LOG the packets you refuse, use two
-separate rules with the same matching criteria, first using target LOG
-then DROP (or REJECT).
-.TP
-\fB\-\-log\-level\fP \fIlevel\fP
-Level of logging (numeric or see \fIsyslog.conf\fP(5)).
-.TP
-\fB\-\-log\-prefix\fP \fIprefix\fP
-Prefix log messages with the specified prefix; up to 29 letters long,
-and useful for distinguishing messages in the logs.
-.TP
-\fB\-\-log\-tcp\-sequence\fP
-Log TCP sequence numbers. This is a security risk if the log is
-readable by users.
-.TP
-\fB\-\-log\-tcp\-options\fP
-Log options from the TCP packet header.
-.TP
-\fB\-\-log\-ip\-options\fP
-Log options from the IPv6 packet header.
-.TP
-\fB\-\-log\-uid\fP
-Log the userid of the process which generated the packet.
diff --git a/extensions/libipt_LOG.c b/extensions/libipt_LOG.c
deleted file mode 100644
index 77f16d1..0000000
--- a/extensions/libipt_LOG.c
+++ /dev/null
@@ -1,186 +0,0 @@
-#include <stdio.h>
-#include <string.h>
-#include <syslog.h>
-#include <xtables.h>
-#include <linux/netfilter_ipv4/ipt_LOG.h>
-
-#define LOG_DEFAULT_LEVEL LOG_WARNING
-
-#ifndef IPT_LOG_UID /* Old kernel */
-#define IPT_LOG_UID	0x08	/* Log UID owning local socket */
-#undef  IPT_LOG_MASK
-#define IPT_LOG_MASK	0x0f
-#endif
-
-enum {
-	O_LOG_LEVEL = 0,
-	O_LOG_PREFIX,
-	O_LOG_TCPSEQ,
-	O_LOG_TCPOPTS,
-	O_LOG_IPOPTS,
-	O_LOG_UID,
-	O_LOG_MAC,
-};
-
-static void LOG_help(void)
-{
-	printf(
-"LOG target options:\n"
-" --log-level level		Level of logging (numeric or see syslog.conf)\n"
-" --log-prefix prefix		Prefix log messages with this prefix.\n\n"
-" --log-tcp-sequence		Log TCP sequence numbers.\n\n"
-" --log-tcp-options		Log TCP options.\n\n"
-" --log-ip-options		Log IP options.\n\n"
-" --log-uid			Log UID owning the local socket.\n\n"
-" --log-macdecode		Decode MAC addresses and protocol.\n\n");
-}
-
-#define s struct ipt_log_info
-static const struct xt_option_entry LOG_opts[] = {
-	{.name = "log-level", .id = O_LOG_LEVEL, .type = XTTYPE_SYSLOGLEVEL,
-	 .flags = XTOPT_PUT, XTOPT_POINTER(s, level)},
-	{.name = "log-prefix", .id = O_LOG_PREFIX, .type = XTTYPE_STRING,
-	 .flags = XTOPT_PUT, XTOPT_POINTER(s, prefix), .min = 1},
-	{.name = "log-tcp-sequence", .id = O_LOG_TCPSEQ, .type = XTTYPE_NONE},
-	{.name = "log-tcp-options", .id = O_LOG_TCPOPTS, .type = XTTYPE_NONE},
-	{.name = "log-ip-options", .id = O_LOG_IPOPTS, .type = XTTYPE_NONE},
-	{.name = "log-uid", .id = O_LOG_UID, .type = XTTYPE_NONE},
-	{.name = "log-macdecode", .id = O_LOG_MAC, .type = XTTYPE_NONE},
-	XTOPT_TABLEEND,
-};
-#undef s
-
-static void LOG_init(struct xt_entry_target *t)
-{
-	struct ipt_log_info *loginfo = (struct ipt_log_info *)t->data;
-
-	loginfo->level = LOG_DEFAULT_LEVEL;
-
-}
-
-struct ipt_log_names {
-	const char *name;
-	unsigned int level;
-};
-
-static const struct ipt_log_names ipt_log_names[]
-= { { .name = "alert",   .level = LOG_ALERT },
-    { .name = "crit",    .level = LOG_CRIT },
-    { .name = "debug",   .level = LOG_DEBUG },
-    { .name = "emerg",   .level = LOG_EMERG },
-    { .name = "error",   .level = LOG_ERR },		/* DEPRECATED */
-    { .name = "info",    .level = LOG_INFO },
-    { .name = "notice",  .level = LOG_NOTICE },
-    { .name = "panic",   .level = LOG_EMERG },		/* DEPRECATED */
-    { .name = "warning", .level = LOG_WARNING }
-};
-
-static void LOG_parse(struct xt_option_call *cb)
-{
-	struct ipt_log_info *info = cb->data;
-
-	xtables_option_parse(cb);
-	switch (cb->entry->id) {
-	case O_LOG_PREFIX:
-		if (strchr(cb->arg, '\n') != NULL)
-			xtables_error(PARAMETER_PROBLEM,
-				   "Newlines not allowed in --log-prefix");
-		break;
-	case O_LOG_TCPSEQ:
-		info->logflags |= IPT_LOG_TCPSEQ;
-		break;
-	case O_LOG_TCPOPTS:
-		info->logflags |= IPT_LOG_TCPOPT;
-		break;
-	case O_LOG_IPOPTS:
-		info->logflags |= IPT_LOG_IPOPT;
-		break;
-	case O_LOG_UID:
-		info->logflags |= IPT_LOG_UID;
-		break;
-	case O_LOG_MAC:
-		info->logflags |= IPT_LOG_MACDECODE;
-		break;
-	}
-}
-
-static void LOG_print(const void *ip, const struct xt_entry_target *target,
-                      int numeric)
-{
-	const struct ipt_log_info *loginfo
-		= (const struct ipt_log_info *)target->data;
-	unsigned int i = 0;
-
-	printf(" LOG");
-	if (numeric)
-		printf(" flags %u level %u",
-		       loginfo->logflags, loginfo->level);
-	else {
-		for (i = 0; i < ARRAY_SIZE(ipt_log_names); ++i)
-			if (loginfo->level == ipt_log_names[i].level) {
-				printf(" level %s", ipt_log_names[i].name);
-				break;
-			}
-		if (i == ARRAY_SIZE(ipt_log_names))
-			printf(" UNKNOWN level %u", loginfo->level);
-		if (loginfo->logflags & IPT_LOG_TCPSEQ)
-			printf(" tcp-sequence");
-		if (loginfo->logflags & IPT_LOG_TCPOPT)
-			printf(" tcp-options");
-		if (loginfo->logflags & IPT_LOG_IPOPT)
-			printf(" ip-options");
-		if (loginfo->logflags & IPT_LOG_UID)
-			printf(" uid");
-		if (loginfo->logflags & IPT_LOG_MACDECODE)
-			printf(" macdecode");
-		if (loginfo->logflags & ~(IPT_LOG_MASK))
-			printf(" unknown-flags");
-	}
-
-	if (strcmp(loginfo->prefix, "") != 0)
-		printf(" prefix \"%s\"", loginfo->prefix);
-}
-
-static void LOG_save(const void *ip, const struct xt_entry_target *target)
-{
-	const struct ipt_log_info *loginfo
-		= (const struct ipt_log_info *)target->data;
-
-	if (strcmp(loginfo->prefix, "") != 0) {
-		printf(" --log-prefix");
-		xtables_save_string(loginfo->prefix);
-	}
-
-	if (loginfo->level != LOG_DEFAULT_LEVEL)
-		printf(" --log-level %d", loginfo->level);
-
-	if (loginfo->logflags & IPT_LOG_TCPSEQ)
-		printf(" --log-tcp-sequence");
-	if (loginfo->logflags & IPT_LOG_TCPOPT)
-		printf(" --log-tcp-options");
-	if (loginfo->logflags & IPT_LOG_IPOPT)
-		printf(" --log-ip-options");
-	if (loginfo->logflags & IPT_LOG_UID)
-		printf(" --log-uid");
-	if (loginfo->logflags & IPT_LOG_MACDECODE)
-		printf(" --log-macdecode");
-}
-
-static struct xtables_target log_tg_reg = {
-	.name          = "LOG",
-	.version       = XTABLES_VERSION,
-	.family        = NFPROTO_IPV4,
-	.size          = XT_ALIGN(sizeof(struct ipt_log_info)),
-	.userspacesize = XT_ALIGN(sizeof(struct ipt_log_info)),
-	.help          = LOG_help,
-	.init          = LOG_init,
-	.print         = LOG_print,
-	.save          = LOG_save,
-	.x6_parse      = LOG_parse,
-	.x6_options    = LOG_opts,
-};
-
-void _init(void)
-{
-	xtables_register_target(&log_tg_reg);
-}
diff --git a/extensions/libipt_LOG.man b/extensions/libipt_LOG.man
deleted file mode 100644
index 47c35e0..0000000
--- a/extensions/libipt_LOG.man
+++ /dev/null
@@ -1,31 +0,0 @@
-Turn on kernel logging of matching packets.  When this option is set
-for a rule, the Linux kernel will print some information on all
-matching packets (like most IP header fields) via the kernel log
-(where it can be read with
-.I dmesg
-or 
-.IR syslogd (8)).
-This is a "non-terminating target", i.e. rule traversal continues at
-the next rule.  So if you want to LOG the packets you refuse, use two
-separate rules with the same matching criteria, first using target LOG
-then DROP (or REJECT).
-.TP
-\fB\-\-log\-level\fP \fIlevel\fP
-Level of logging (numeric or see \fIsyslog.conf\fP(5)).
-.TP
-\fB\-\-log\-prefix\fP \fIprefix\fP
-Prefix log messages with the specified prefix; up to 29 letters long,
-and useful for distinguishing messages in the logs.
-.TP
-\fB\-\-log\-tcp\-sequence\fP
-Log TCP sequence numbers. This is a security risk if the log is
-readable by users.
-.TP
-\fB\-\-log\-tcp\-options\fP
-Log options from the TCP packet header.
-.TP
-\fB\-\-log\-ip\-options\fP
-Log options from the IP packet header.
-.TP
-\fB\-\-log\-uid\fP
-Log the userid of the process which generated the packet.
diff --git a/extensions/libxt_LOG.c b/extensions/libxt_LOG.c
new file mode 100644
index 0000000..a4c11b6
--- /dev/null
+++ b/extensions/libxt_LOG.c
@@ -0,0 +1,201 @@
+#include <stdio.h>
+#include <string.h>
+#include <syslog.h>
+#include <xtables.h>
+#include <linux/netfilter/xt_LOG.h>
+
+#define LOG_DEFAULT_LEVEL LOG_WARNING
+
+#ifndef XT_LOG_UID /* Old kernel */
+#define XT_LOG_UID	0x08	/* Log UID owning local socket */
+#undef  XT_LOG_MASK
+#define XT_LOG_MASK	0x0f
+#endif
+
+enum {
+	O_LOG_LEVEL = 0,
+	O_LOG_PREFIX,
+	O_LOG_TCPSEQ,
+	O_LOG_TCPOPTS,
+	O_LOG_IPOPTS,
+	O_LOG_UID,
+	O_LOG_MAC,
+};
+
+static void LOG_help(void)
+{
+	printf(
+"LOG target options:\n"
+" --log-level level		Level of logging (numeric or see syslog.conf)\n"
+" --log-prefix prefix		Prefix log messages with this prefix.\n\n"
+" --log-tcp-sequence		Log TCP sequence numbers.\n\n"
+" --log-tcp-options		Log TCP options.\n\n"
+" --log-ip-options		Log IP options.\n\n"
+" --log-uid			Log UID owning the local socket.\n\n"
+" --log-macdecode		Decode MAC addresses and protocol.\n\n");
+}
+
+#define s struct xt_log_info
+static const struct xt_option_entry LOG_opts[] = {
+	{.name = "log-level", .id = O_LOG_LEVEL, .type = XTTYPE_SYSLOGLEVEL,
+	 .flags = XTOPT_PUT, XTOPT_POINTER(s, level)},
+	{.name = "log-prefix", .id = O_LOG_PREFIX, .type = XTTYPE_STRING,
+	 .flags = XTOPT_PUT, XTOPT_POINTER(s, prefix), .min = 1},
+	{.name = "log-tcp-sequence", .id = O_LOG_TCPSEQ, .type = XTTYPE_NONE},
+	{.name = "log-tcp-options", .id = O_LOG_TCPOPTS, .type = XTTYPE_NONE},
+	{.name = "log-ip-options", .id = O_LOG_IPOPTS, .type = XTTYPE_NONE},
+	{.name = "log-uid", .id = O_LOG_UID, .type = XTTYPE_NONE},
+	{.name = "log-macdecode", .id = O_LOG_MAC, .type = XTTYPE_NONE},
+	XTOPT_TABLEEND,
+};
+#undef s
+
+static void LOG_init(struct xt_entry_target *t)
+{
+	struct xt_log_info *loginfo = (struct xt_log_info *)t->data;
+
+	loginfo->level = LOG_DEFAULT_LEVEL;
+
+}
+
+struct ipt_log_names {
+	const char *name;
+	unsigned int level;
+};
+
+static const struct ipt_log_names ipt_log_names[]
+= { { .name = "alert",   .level = LOG_ALERT },
+    { .name = "crit",    .level = LOG_CRIT },
+    { .name = "debug",   .level = LOG_DEBUG },
+    { .name = "emerg",   .level = LOG_EMERG },
+    { .name = "error",   .level = LOG_ERR },		/* DEPRECATED */
+    { .name = "info",    .level = LOG_INFO },
+    { .name = "notice",  .level = LOG_NOTICE },
+    { .name = "panic",   .level = LOG_EMERG },		/* DEPRECATED */
+    { .name = "warning", .level = LOG_WARNING }
+};
+
+static void LOG_parse(struct xt_option_call *cb)
+{
+	struct xt_log_info *info = cb->data;
+
+	xtables_option_parse(cb);
+	switch (cb->entry->id) {
+	case O_LOG_PREFIX:
+		if (strchr(cb->arg, '\n') != NULL)
+			xtables_error(PARAMETER_PROBLEM,
+				   "Newlines not allowed in --log-prefix");
+		break;
+	case O_LOG_TCPSEQ:
+		info->logflags |= XT_LOG_TCPSEQ;
+		break;
+	case O_LOG_TCPOPTS:
+		info->logflags |= XT_LOG_TCPOPT;
+		break;
+	case O_LOG_IPOPTS:
+		info->logflags |= XT_LOG_IPOPT;
+		break;
+	case O_LOG_UID:
+		info->logflags |= XT_LOG_UID;
+		break;
+	case O_LOG_MAC:
+		info->logflags |= XT_LOG_MACDECODE;
+		break;
+	}
+}
+
+static void LOG_print(const void *ip, const struct xt_entry_target *target,
+                      int numeric)
+{
+	const struct xt_log_info *loginfo
+		= (const struct xt_log_info *)target->data;
+	unsigned int i = 0;
+
+	printf(" LOG");
+	if (numeric)
+		printf(" flags %u level %u",
+		       loginfo->logflags, loginfo->level);
+	else {
+		for (i = 0; i < ARRAY_SIZE(ipt_log_names); ++i)
+			if (loginfo->level == ipt_log_names[i].level) {
+				printf(" level %s", ipt_log_names[i].name);
+				break;
+			}
+		if (i == ARRAY_SIZE(ipt_log_names))
+			printf(" UNKNOWN level %u", loginfo->level);
+		if (loginfo->logflags & XT_LOG_TCPSEQ)
+			printf(" tcp-sequence");
+		if (loginfo->logflags & XT_LOG_TCPOPT)
+			printf(" tcp-options");
+		if (loginfo->logflags & XT_LOG_IPOPT)
+			printf(" ip-options");
+		if (loginfo->logflags & XT_LOG_UID)
+			printf(" uid");
+		if (loginfo->logflags & XT_LOG_MACDECODE)
+			printf(" macdecode");
+		if (loginfo->logflags & ~(XT_LOG_MASK))
+			printf(" unknown-flags");
+	}
+
+	if (strcmp(loginfo->prefix, "") != 0)
+		printf(" prefix \"%s\"", loginfo->prefix);
+}
+
+static void LOG_save(const void *ip, const struct xt_entry_target *target)
+{
+	const struct xt_log_info *loginfo
+		= (const struct xt_log_info *)target->data;
+
+	if (strcmp(loginfo->prefix, "") != 0) {
+		printf(" --log-prefix");
+		xtables_save_string(loginfo->prefix);
+	}
+
+	if (loginfo->level != LOG_DEFAULT_LEVEL)
+		printf(" --log-level %d", loginfo->level);
+
+	if (loginfo->logflags & XT_LOG_TCPSEQ)
+		printf(" --log-tcp-sequence");
+	if (loginfo->logflags & XT_LOG_TCPOPT)
+		printf(" --log-tcp-options");
+	if (loginfo->logflags & XT_LOG_IPOPT)
+		printf(" --log-ip-options");
+	if (loginfo->logflags & XT_LOG_UID)
+		printf(" --log-uid");
+	if (loginfo->logflags & XT_LOG_MACDECODE)
+		printf(" --log-macdecode");
+}
+
+static struct xtables_target log_tg_regs[] = {
+	{
+		.name          = "LOG",
+		.version       = XTABLES_VERSION,
+		.family        = NFPROTO_IPV4,
+		.size          = XT_ALIGN(sizeof(struct xt_log_info)),
+		.userspacesize = XT_ALIGN(sizeof(struct xt_log_info)),
+		.help          = LOG_help,
+		.init          = LOG_init,
+		.print         = LOG_print,
+		.save          = LOG_save,
+		.x6_parse      = LOG_parse,
+		.x6_options    = LOG_opts,
+	},
+	{
+		.name          = "LOG",
+		.version       = XTABLES_VERSION,
+		.family        = NFPROTO_IPV6,
+		.size          = XT_ALIGN(sizeof(struct xt_log_info)),
+		.userspacesize = XT_ALIGN(sizeof(struct xt_log_info)),
+		.help          = LOG_help,
+		.init          = LOG_init,
+		.print         = LOG_print,
+		.save          = LOG_save,
+		.x6_parse      = LOG_parse,
+		.x6_options    = LOG_opts,
+	},
+};
+
+void _init(void)
+{
+	xtables_register_targets(log_tg_regs, ARRAY_SIZE(log_tg_regs));
+}
diff --git a/extensions/libxt_LOG.man b/extensions/libxt_LOG.man
new file mode 100644
index 0000000..47c35e0
--- /dev/null
+++ b/extensions/libxt_LOG.man
@@ -0,0 +1,31 @@
+Turn on kernel logging of matching packets.  When this option is set
+for a rule, the Linux kernel will print some information on all
+matching packets (like most IP header fields) via the kernel log
+(where it can be read with
+.I dmesg
+or 
+.IR syslogd (8)).
+This is a "non-terminating target", i.e. rule traversal continues at
+the next rule.  So if you want to LOG the packets you refuse, use two
+separate rules with the same matching criteria, first using target LOG
+then DROP (or REJECT).
+.TP
+\fB\-\-log\-level\fP \fIlevel\fP
+Level of logging (numeric or see \fIsyslog.conf\fP(5)).
+.TP
+\fB\-\-log\-prefix\fP \fIprefix\fP
+Prefix log messages with the specified prefix; up to 29 letters long,
+and useful for distinguishing messages in the logs.
+.TP
+\fB\-\-log\-tcp\-sequence\fP
+Log TCP sequence numbers. This is a security risk if the log is
+readable by users.
+.TP
+\fB\-\-log\-tcp\-options\fP
+Log options from the TCP packet header.
+.TP
+\fB\-\-log\-ip\-options\fP
+Log options from the IP packet header.
+.TP
+\fB\-\-log\-uid\fP
+Log the userid of the process which generated the packet.
diff --git a/include/linux/netfilter/xt_LOG.h b/include/linux/netfilter/xt_LOG.h
new file mode 100644
index 0000000..cac0790
--- /dev/null
+++ b/include/linux/netfilter/xt_LOG.h
@@ -0,0 +1,19 @@
+#ifndef _XT_LOG_H
+#define _XT_LOG_H
+
+/* make sure not to change this without changing nf_log.h:NF_LOG_* (!) */
+#define XT_LOG_TCPSEQ		0x01	/* Log TCP sequence numbers */
+#define XT_LOG_TCPOPT		0x02	/* Log TCP options */
+#define XT_LOG_IPOPT		0x04	/* Log IP options */
+#define XT_LOG_UID		0x08	/* Log UID owning local socket */
+#define XT_LOG_NFLOG		0x10	/* Unsupported, don't reuse */
+#define XT_LOG_MACDECODE	0x20	/* Decode MAC header */
+#define XT_LOG_MASK		0x2f
+
+struct xt_log_info {
+	unsigned char level;
+	unsigned char logflags;
+	char prefix[30];
+};
+
+#endif /* _XT_LOG_H */
-- 
1.7.7


^ permalink raw reply related	[flat|nested] 15+ messages in thread

* [PATCH 6/6] iptables: xt_LOG: Add ring buffer support
  2012-01-22 21:56 [PATCH v2] Merge ipt_LOG and ip6t_LOG, add ring bufffer support Richard Weinberger
                   ` (4 preceding siblings ...)
  2012-01-22 21:56 ` [PATCH 5/6] iptables: Merge libip6t_LOG and libipt_LOG into libxt_LOG Richard Weinberger
@ 2012-01-22 21:56 ` Richard Weinberger
  5 siblings, 0 replies; 15+ messages in thread
From: Richard Weinberger @ 2012-01-22 21:56 UTC (permalink / raw)
  To: netfilter-devel
  Cc: netdev, linux-kernel, eric.dumazet, jengelh, Richard Weinberger

This patch adds "--ring" and "--ring-size" to xt_LOG.

Signed-off-by: Richard Weinberger <richard@nod.at>
---
 extensions/libxt_LOG.c           |  129 ++++++++++++++++++++++++++++++++++++++
 extensions/libxt_LOG.man         |    9 +++
 include/linux/netfilter/xt_LOG.h |   12 +++-
 3 files changed, 149 insertions(+), 1 deletions(-)

diff --git a/extensions/libxt_LOG.c b/extensions/libxt_LOG.c
index a4c11b6..cb98f1b 100644
--- a/extensions/libxt_LOG.c
+++ b/extensions/libxt_LOG.c
@@ -1,10 +1,12 @@
 #include <stdio.h>
 #include <string.h>
+#include <ctype.h>
 #include <syslog.h>
 #include <xtables.h>
 #include <linux/netfilter/xt_LOG.h>
 
 #define LOG_DEFAULT_LEVEL LOG_WARNING
+#define DEFAULT_RING_SIZE 1024
 
 #ifndef XT_LOG_UID /* Old kernel */
 #define XT_LOG_UID	0x08	/* Log UID owning local socket */
@@ -20,6 +22,9 @@ enum {
 	O_LOG_IPOPTS,
 	O_LOG_UID,
 	O_LOG_MAC,
+	O_LOG_TIMESTAMP,
+	O_LOG_RING_NAME,
+	O_LOG_RING_SIZE,
 };
 
 static void LOG_help(void)
@@ -35,6 +40,17 @@ static void LOG_help(void)
 " --log-macdecode		Decode MAC addresses and protocol.\n\n");
 }
 
+static void LOG_help_v1(void)
+{
+	LOG_help();
+
+	printf(
+" --log-timestamp		Add the current time to the log message.\n\n"
+" --ring NAME			Log messages into a ring buffer NAME instead of kernel syslog.\n\n"
+" --ring-size SIZE		Size of the ring buffer in KiB.\n\n"
+);
+}
+
 #define s struct xt_log_info
 static const struct xt_option_entry LOG_opts[] = {
 	{.name = "log-level", .id = O_LOG_LEVEL, .type = XTTYPE_SYSLOGLEVEL,
@@ -50,6 +66,26 @@ static const struct xt_option_entry LOG_opts[] = {
 };
 #undef s
 
+#define s struct xt_log_info_v1
+static const struct xt_option_entry LOG_opts_v1[] = {
+	{.name = "log-level", .id = O_LOG_LEVEL, .type = XTTYPE_SYSLOGLEVEL,
+	 .flags = XTOPT_PUT, XTOPT_POINTER(s, level)},
+	{.name = "log-prefix", .id = O_LOG_PREFIX, .type = XTTYPE_STRING,
+	 .flags = XTOPT_PUT, XTOPT_POINTER(s, prefix), .min = 1},
+	{.name = "log-tcp-sequence", .id = O_LOG_TCPSEQ, .type = XTTYPE_NONE},
+	{.name = "log-tcp-options", .id = O_LOG_TCPOPTS, .type = XTTYPE_NONE},
+	{.name = "log-ip-options", .id = O_LOG_IPOPTS, .type = XTTYPE_NONE},
+	{.name = "log-uid", .id = O_LOG_UID, .type = XTTYPE_NONE},
+	{.name = "log-macdecode", .id = O_LOG_MAC, .type = XTTYPE_NONE},
+	{.name = "log-timestamp", .id = O_LOG_TIMESTAMP, .type = XTTYPE_NONE},
+	{.name = "ring", .id = O_LOG_RING_NAME, .type = XTTYPE_STRING,
+	 .flags = XTOPT_PUT, XTOPT_POINTER(s, ring_name), .min = 1},
+	{.name = "ring-size", .id = O_LOG_RING_SIZE, .type = XTTYPE_UINT64,
+	 .flags = XTOPT_PUT, XTOPT_POINTER(s, ring_size)},
+	XTOPT_TABLEEND,
+};
+#undef s
+
 static void LOG_init(struct xt_entry_target *t)
 {
 	struct xt_log_info *loginfo = (struct xt_log_info *)t->data;
@@ -104,6 +140,29 @@ static void LOG_parse(struct xt_option_call *cb)
 	}
 }
 
+static void LOG_parse_v1(struct xt_option_call *cb)
+{
+	struct xt_log_info_v1 *info = cb->data;
+	int i;
+
+	LOG_parse(cb);
+
+	switch (cb->entry->id) {
+	case O_LOG_TIMESTAMP:
+		info->logflags |= XT_LOG_ADD_TIMESTAMP;
+		break;	
+	case O_LOG_RING_NAME:
+		if (!info->ring_size)
+			info->ring_size = DEFAULT_RING_SIZE;
+
+		for (i = 0; i < strlen(info->ring_name); i++)
+			if (!isalnum(cb->arg[i]))
+				xtables_error(PARAMETER_PROBLEM,
+				"Ring name is not alphanumeric");
+		break;
+	}
+}
+
 static void LOG_print(const void *ip, const struct xt_entry_target *target,
                       int numeric)
 {
@@ -141,6 +200,27 @@ static void LOG_print(const void *ip, const struct xt_entry_target *target,
 		printf(" prefix \"%s\"", loginfo->prefix);
 }
 
+static void LOG_print_v1(const void *ip, const struct xt_entry_target *target,
+		         int numeric)
+{
+	const struct xt_log_info_v1 *loginfo
+		= (const struct xt_log_info_v1 *)target->data;
+
+	LOG_print(ip, target, numeric);
+
+	if (!numeric) {
+		if (loginfo->logflags & XT_LOG_ADD_TIMESTAMP)
+			printf(" log-timestamp");	
+	}
+
+	if (loginfo->ring_name[0]) {
+		printf(" ring \"%s\"", loginfo->ring_name);
+
+		if (loginfo->ring_size != DEFAULT_RING_SIZE)
+			printf(" ring-size %lu", loginfo->ring_size);
+	}
+}
+
 static void LOG_save(const void *ip, const struct xt_entry_target *target)
 {
 	const struct xt_log_info *loginfo
@@ -166,6 +246,25 @@ static void LOG_save(const void *ip, const struct xt_entry_target *target)
 		printf(" --log-macdecode");
 }
 
+static void LOG_save_v1(const void *ip, const struct xt_entry_target *target)
+{
+	const struct xt_log_info_v1 *loginfo
+		= (const struct xt_log_info_v1 *)target->data;
+
+	LOG_save(ip, target);
+
+	if (loginfo->logflags & XT_LOG_ADD_TIMESTAMP)
+		printf(" --log-timestamp");
+
+	if (loginfo->ring_name[0]) {
+		printf(" --ring");
+		xtables_save_string(loginfo->ring_name);
+
+		if (loginfo->ring_size != DEFAULT_RING_SIZE)
+			printf(" --ring-size %lu", loginfo->ring_size);
+	}
+}
+
 static struct xtables_target log_tg_regs[] = {
 	{
 		.name          = "LOG",
@@ -176,6 +275,7 @@ static struct xtables_target log_tg_regs[] = {
 		.help          = LOG_help,
 		.init          = LOG_init,
 		.print         = LOG_print,
+		.revision      = 0,
 		.save          = LOG_save,
 		.x6_parse      = LOG_parse,
 		.x6_options    = LOG_opts,
@@ -189,10 +289,39 @@ static struct xtables_target log_tg_regs[] = {
 		.help          = LOG_help,
 		.init          = LOG_init,
 		.print         = LOG_print,
+		.revision      = 0,
 		.save          = LOG_save,
 		.x6_parse      = LOG_parse,
 		.x6_options    = LOG_opts,
 	},
+	{
+		.name          = "LOG",
+		.version       = XTABLES_VERSION,
+		.family        = NFPROTO_IPV4,
+		.size          = XT_ALIGN(sizeof(struct xt_log_info_v1) + sizeof(void *)),
+		.userspacesize = XT_ALIGN(sizeof(struct xt_log_info_v1)),
+		.help          = LOG_help_v1,
+		.init          = LOG_init,
+		.print         = LOG_print_v1,
+		.revision      = 1,
+		.save          = LOG_save_v1,
+		.x6_parse      = LOG_parse_v1,
+		.x6_options    = LOG_opts_v1,
+	},
+	{
+		.name          = "LOG",
+		.version       = XTABLES_VERSION,
+		.family        = NFPROTO_IPV6,
+		.size          = XT_ALIGN(sizeof(struct xt_log_info_v1) + sizeof(void *)),
+		.userspacesize = XT_ALIGN(sizeof(struct xt_log_info_v1)),
+		.help          = LOG_help_v1,
+		.init          = LOG_init,
+		.print         = LOG_print_v1,
+		.revision      = 1,
+		.save          = LOG_save_v1,
+		.x6_parse      = LOG_parse_v1,
+		.x6_options    = LOG_opts_v1,
+	},
 };
 
 void _init(void)
diff --git a/extensions/libxt_LOG.man b/extensions/libxt_LOG.man
index 47c35e0..2f0b2ff 100644
--- a/extensions/libxt_LOG.man
+++ b/extensions/libxt_LOG.man
@@ -29,3 +29,12 @@ Log options from the IP packet header.
 .TP
 \fB\-\-log\-uid\fP
 Log the userid of the process which generated the packet.
+\fB\-\-log\-timestamp\fP
+Add a timestamp to each log message.
+\fB\-\-ring\fP \fIname\fP
+Log all messages into a ring buffer identified by \fIname\fP.
+Each ring buffer is represented as file in 
+/proc/net/netfilter/xt_LOG_ring/.
+\fB\-\-ring\-size\fP \fIsize\fP
+Set the ring buffer size in KiB.
+Default is 1024 KiB.
diff --git a/include/linux/netfilter/xt_LOG.h b/include/linux/netfilter/xt_LOG.h
index cac0790..5956655 100644
--- a/include/linux/netfilter/xt_LOG.h
+++ b/include/linux/netfilter/xt_LOG.h
@@ -8,7 +8,8 @@
 #define XT_LOG_UID		0x08	/* Log UID owning local socket */
 #define XT_LOG_NFLOG		0x10	/* Unsupported, don't reuse */
 #define XT_LOG_MACDECODE	0x20	/* Decode MAC header */
-#define XT_LOG_MASK		0x2f
+#define XT_LOG_ADD_TIMESTAMP	0x40	/* Add a timestamp */
+#define XT_LOG_MASK		0x6f
 
 struct xt_log_info {
 	unsigned char level;
@@ -16,4 +17,13 @@ struct xt_log_info {
 	char prefix[30];
 };
 
+struct xt_log_info_v1 {
+	unsigned char level;
+	unsigned char logflags;
+	char prefix[30];
+
+	char ring_name[30];
+	unsigned long ring_size;
+};
+
 #endif /* _XT_LOG_H */
-- 
1.7.7


^ permalink raw reply related	[flat|nested] 15+ messages in thread

* [PATCH v6] Netfilter ring buffer support
@ 2012-03-05 23:19 Richard Weinberger
  2012-03-05 23:19 ` [PATCH 1/6] Netfilter: Merge ipt_LOG and ip6_LOG into xt_LOG Richard Weinberger
  0 siblings, 1 reply; 15+ messages in thread
From: Richard Weinberger @ 2012-03-05 23:19 UTC (permalink / raw)
  To: pablo
  Cc: jengelh, eric.dumazet, linux-kernel, netdev, netfilter-devel, rostedt

This patch set merges ipt_LOG and ip6t_LOG and adds ring buffer support
to xt_LOG.

Using "--ring" an user can create LOG rules which log messages into
one or more ring buffers.
Each ring buffer is represented as pipe-like file in
/proc/net/netfilter/nf_log_ring/.

Ring buffer support can be enabled/disabled using
CONFIG_NETFILTER_XT_TARGET_LOG_RING.

Changes since v1:
 - Merged ipt_LOG and ip6t_LOG
 - Implemented ring buffer support as part of xt_LOG.

Changes since v2:
 - Fixed struct xt_log_info_v1's data layout
 - Removed the sizeof(void *) hack
 - Replaced BUG() by WARN_ON_ONCE()

Changes since v3:
 - Merged xt_LOG_core.c and xt_LOG_ring.c into xt_LOG.c
 - Made checkpatch.pl happy

Changes since v4:
 - Fixed a typo in include/linux/netfilter/Kbuild
   (Thanks Bastian!)

Changes since v5:
 - Made timestamp support a separate patch
 - Renamed xt_LOG_ring to nf_log_ring
 - Removed unused prototypes from xt_log.h
 - Renamed find_next_entry_inc() to find_next_iter_entry()
 - Fixed OOM error path in rlog_open_pipe()

Patch 1 and 2 have already been applied to net-next.git.

[PATCH 1/6] Netfilter: Merge ipt_LOG and ip6_LOG into xt_LOG
[PATCH 2/6] netfilter: xt_LOG: fix bogus extra layer-4 logging
[PATCH 3/6] ring_buffer: Export for_each_buffer_cpu()
[PATCH 4/6] xt_log: Make printk() in sb_close() optional
[PATCH 5/6] Netfilter: xt_LOG: Implement ring buffer support
[PATCH 6/6] Netfilter: xt_LOG: Add timestamp support

Thanks,
//richard

^ permalink raw reply	[flat|nested] 15+ messages in thread

* [PATCH 1/6] Netfilter: Merge ipt_LOG and ip6_LOG into xt_LOG
  2012-03-05 23:19 [PATCH v6] Netfilter " Richard Weinberger
@ 2012-03-05 23:19 ` Richard Weinberger
  0 siblings, 0 replies; 15+ messages in thread
From: Richard Weinberger @ 2012-03-05 23:19 UTC (permalink / raw)
  To: pablo
  Cc: jengelh, eric.dumazet, linux-kernel, netdev, netfilter-devel,
	rostedt, Richard Weinberger

ipt_LOG and ip6_LOG have a lot of common code, merge them
to reduce duplicate code.

Signed-off-by: Richard Weinberger <richard@nod.at>
---
 include/linux/netfilter/Kbuild          |    1 +
 include/linux/netfilter/xt_LOG.h        |   19 +
 include/linux/netfilter_ipv4/ipt_LOG.h  |    2 +
 include/linux/netfilter_ipv6/ip6t_LOG.h |    2 +
 net/ipv4/netfilter/Kconfig              |    9 -
 net/ipv4/netfilter/Makefile             |    1 -
 net/ipv4/netfilter/ipt_LOG.c            |  516 -----------------
 net/ipv6/netfilter/Kconfig              |    9 -
 net/ipv6/netfilter/Makefile             |    1 -
 net/ipv6/netfilter/ip6t_LOG.c           |  527 ------------------
 net/netfilter/Kconfig                   |    9 +
 net/netfilter/Makefile                  |    1 +
 net/netfilter/xt_LOG.c                  |  921 +++++++++++++++++++++++++++++++
 13 files changed, 955 insertions(+), 1063 deletions(-)
 create mode 100644 include/linux/netfilter/xt_LOG.h
 delete mode 100644 net/ipv4/netfilter/ipt_LOG.c
 delete mode 100644 net/ipv6/netfilter/ip6t_LOG.c
 create mode 100644 net/netfilter/xt_LOG.c

diff --git a/include/linux/netfilter/Kbuild b/include/linux/netfilter/Kbuild
index e144f54..aaa72aa 100644
--- a/include/linux/netfilter/Kbuild
+++ b/include/linux/netfilter/Kbuild
@@ -22,6 +22,7 @@ header-y += xt_CT.h
 header-y += xt_DSCP.h
 header-y += xt_IDLETIMER.h
 header-y += xt_LED.h
+header-y += xt_LOG.h
 header-y += xt_MARK.h
 header-y += xt_nfacct.h
 header-y += xt_NFLOG.h
diff --git a/include/linux/netfilter/xt_LOG.h b/include/linux/netfilter/xt_LOG.h
new file mode 100644
index 0000000..cac0790
--- /dev/null
+++ b/include/linux/netfilter/xt_LOG.h
@@ -0,0 +1,19 @@
+#ifndef _XT_LOG_H
+#define _XT_LOG_H
+
+/* make sure not to change this without changing nf_log.h:NF_LOG_* (!) */
+#define XT_LOG_TCPSEQ		0x01	/* Log TCP sequence numbers */
+#define XT_LOG_TCPOPT		0x02	/* Log TCP options */
+#define XT_LOG_IPOPT		0x04	/* Log IP options */
+#define XT_LOG_UID		0x08	/* Log UID owning local socket */
+#define XT_LOG_NFLOG		0x10	/* Unsupported, don't reuse */
+#define XT_LOG_MACDECODE	0x20	/* Decode MAC header */
+#define XT_LOG_MASK		0x2f
+
+struct xt_log_info {
+	unsigned char level;
+	unsigned char logflags;
+	char prefix[30];
+};
+
+#endif /* _XT_LOG_H */
diff --git a/include/linux/netfilter_ipv4/ipt_LOG.h b/include/linux/netfilter_ipv4/ipt_LOG.h
index dcdbadf..5d81520 100644
--- a/include/linux/netfilter_ipv4/ipt_LOG.h
+++ b/include/linux/netfilter_ipv4/ipt_LOG.h
@@ -1,6 +1,8 @@
 #ifndef _IPT_LOG_H
 #define _IPT_LOG_H
 
+#warning "Please update iptables, this file will be removed soon!"
+
 /* make sure not to change this without changing netfilter.h:NF_LOG_* (!) */
 #define IPT_LOG_TCPSEQ		0x01	/* Log TCP sequence numbers */
 #define IPT_LOG_TCPOPT		0x02	/* Log TCP options */
diff --git a/include/linux/netfilter_ipv6/ip6t_LOG.h b/include/linux/netfilter_ipv6/ip6t_LOG.h
index 9dd5579..3dd0bc4 100644
--- a/include/linux/netfilter_ipv6/ip6t_LOG.h
+++ b/include/linux/netfilter_ipv6/ip6t_LOG.h
@@ -1,6 +1,8 @@
 #ifndef _IP6T_LOG_H
 #define _IP6T_LOG_H
 
+#warning "Please update iptables, this file will be removed soon!"
+
 /* make sure not to change this without changing netfilter.h:NF_LOG_* (!) */
 #define IP6T_LOG_TCPSEQ		0x01	/* Log TCP sequence numbers */
 #define IP6T_LOG_TCPOPT		0x02	/* Log TCP options */
diff --git a/net/ipv4/netfilter/Kconfig b/net/ipv4/netfilter/Kconfig
index 74dfc9e..fcc543c 100644
--- a/net/ipv4/netfilter/Kconfig
+++ b/net/ipv4/netfilter/Kconfig
@@ -123,15 +123,6 @@ config IP_NF_TARGET_REJECT
 
 	  To compile it as a module, choose M here.  If unsure, say N.
 
-config IP_NF_TARGET_LOG
-	tristate "LOG target support"
-	default m if NETFILTER_ADVANCED=n
-	help
-	  This option adds a `LOG' target, which allows you to create rules in
-	  any iptables table which records the packet header to the syslog.
-
-	  To compile it as a module, choose M here.  If unsure, say N.
-
 config IP_NF_TARGET_ULOG
 	tristate "ULOG target support"
 	default m if NETFILTER_ADVANCED=n
diff --git a/net/ipv4/netfilter/Makefile b/net/ipv4/netfilter/Makefile
index 213a462..240b684 100644
--- a/net/ipv4/netfilter/Makefile
+++ b/net/ipv4/netfilter/Makefile
@@ -54,7 +54,6 @@ obj-$(CONFIG_IP_NF_MATCH_RPFILTER) += ipt_rpfilter.o
 # targets
 obj-$(CONFIG_IP_NF_TARGET_CLUSTERIP) += ipt_CLUSTERIP.o
 obj-$(CONFIG_IP_NF_TARGET_ECN) += ipt_ECN.o
-obj-$(CONFIG_IP_NF_TARGET_LOG) += ipt_LOG.o
 obj-$(CONFIG_IP_NF_TARGET_MASQUERADE) += ipt_MASQUERADE.o
 obj-$(CONFIG_IP_NF_TARGET_NETMAP) += ipt_NETMAP.o
 obj-$(CONFIG_IP_NF_TARGET_REDIRECT) += ipt_REDIRECT.o
diff --git a/net/ipv4/netfilter/ipt_LOG.c b/net/ipv4/netfilter/ipt_LOG.c
deleted file mode 100644
index d76d6c9..0000000
--- a/net/ipv4/netfilter/ipt_LOG.c
+++ /dev/null
@@ -1,516 +0,0 @@
-/*
- * This is a module which is used for logging packets.
- */
-
-/* (C) 1999-2001 Paul `Rusty' Russell
- * (C) 2002-2004 Netfilter Core Team <coreteam@netfilter.org>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- */
-#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
-#include <linux/module.h>
-#include <linux/spinlock.h>
-#include <linux/skbuff.h>
-#include <linux/if_arp.h>
-#include <linux/ip.h>
-#include <net/icmp.h>
-#include <net/udp.h>
-#include <net/tcp.h>
-#include <net/route.h>
-
-#include <linux/netfilter.h>
-#include <linux/netfilter/x_tables.h>
-#include <linux/netfilter_ipv4/ipt_LOG.h>
-#include <net/netfilter/nf_log.h>
-#include <net/netfilter/xt_log.h>
-
-MODULE_LICENSE("GPL");
-MODULE_AUTHOR("Netfilter Core Team <coreteam@netfilter.org>");
-MODULE_DESCRIPTION("Xtables: IPv4 packet logging to syslog");
-
-/* One level of recursion won't kill us */
-static void dump_packet(struct sbuff *m,
-			const struct nf_loginfo *info,
-			const struct sk_buff *skb,
-			unsigned int iphoff)
-{
-	struct iphdr _iph;
-	const struct iphdr *ih;
-	unsigned int logflags;
-
-	if (info->type == NF_LOG_TYPE_LOG)
-		logflags = info->u.log.logflags;
-	else
-		logflags = NF_LOG_MASK;
-
-	ih = skb_header_pointer(skb, iphoff, sizeof(_iph), &_iph);
-	if (ih == NULL) {
-		sb_add(m, "TRUNCATED");
-		return;
-	}
-
-	/* Important fields:
-	 * TOS, len, DF/MF, fragment offset, TTL, src, dst, options. */
-	/* Max length: 40 "SRC=255.255.255.255 DST=255.255.255.255 " */
-	sb_add(m, "SRC=%pI4 DST=%pI4 ",
-	       &ih->saddr, &ih->daddr);
-
-	/* Max length: 46 "LEN=65535 TOS=0xFF PREC=0xFF TTL=255 ID=65535 " */
-	sb_add(m, "LEN=%u TOS=0x%02X PREC=0x%02X TTL=%u ID=%u ",
-	       ntohs(ih->tot_len), ih->tos & IPTOS_TOS_MASK,
-	       ih->tos & IPTOS_PREC_MASK, ih->ttl, ntohs(ih->id));
-
-	/* Max length: 6 "CE DF MF " */
-	if (ntohs(ih->frag_off) & IP_CE)
-		sb_add(m, "CE ");
-	if (ntohs(ih->frag_off) & IP_DF)
-		sb_add(m, "DF ");
-	if (ntohs(ih->frag_off) & IP_MF)
-		sb_add(m, "MF ");
-
-	/* Max length: 11 "FRAG:65535 " */
-	if (ntohs(ih->frag_off) & IP_OFFSET)
-		sb_add(m, "FRAG:%u ", ntohs(ih->frag_off) & IP_OFFSET);
-
-	if ((logflags & IPT_LOG_IPOPT) &&
-	    ih->ihl * 4 > sizeof(struct iphdr)) {
-		const unsigned char *op;
-		unsigned char _opt[4 * 15 - sizeof(struct iphdr)];
-		unsigned int i, optsize;
-
-		optsize = ih->ihl * 4 - sizeof(struct iphdr);
-		op = skb_header_pointer(skb, iphoff+sizeof(_iph),
-					optsize, _opt);
-		if (op == NULL) {
-			sb_add(m, "TRUNCATED");
-			return;
-		}
-
-		/* Max length: 127 "OPT (" 15*4*2chars ") " */
-		sb_add(m, "OPT (");
-		for (i = 0; i < optsize; i++)
-			sb_add(m, "%02X", op[i]);
-		sb_add(m, ") ");
-	}
-
-	switch (ih->protocol) {
-	case IPPROTO_TCP: {
-		struct tcphdr _tcph;
-		const struct tcphdr *th;
-
-		/* Max length: 10 "PROTO=TCP " */
-		sb_add(m, "PROTO=TCP ");
-
-		if (ntohs(ih->frag_off) & IP_OFFSET)
-			break;
-
-		/* Max length: 25 "INCOMPLETE [65535 bytes] " */
-		th = skb_header_pointer(skb, iphoff + ih->ihl * 4,
-					sizeof(_tcph), &_tcph);
-		if (th == NULL) {
-			sb_add(m, "INCOMPLETE [%u bytes] ",
-			       skb->len - iphoff - ih->ihl*4);
-			break;
-		}
-
-		/* Max length: 20 "SPT=65535 DPT=65535 " */
-		sb_add(m, "SPT=%u DPT=%u ",
-		       ntohs(th->source), ntohs(th->dest));
-		/* Max length: 30 "SEQ=4294967295 ACK=4294967295 " */
-		if (logflags & IPT_LOG_TCPSEQ)
-			sb_add(m, "SEQ=%u ACK=%u ",
-			       ntohl(th->seq), ntohl(th->ack_seq));
-		/* Max length: 13 "WINDOW=65535 " */
-		sb_add(m, "WINDOW=%u ", ntohs(th->window));
-		/* Max length: 9 "RES=0x3F " */
-		sb_add(m, "RES=0x%02x ", (u8)(ntohl(tcp_flag_word(th) & TCP_RESERVED_BITS) >> 22));
-		/* Max length: 32 "CWR ECE URG ACK PSH RST SYN FIN " */
-		if (th->cwr)
-			sb_add(m, "CWR ");
-		if (th->ece)
-			sb_add(m, "ECE ");
-		if (th->urg)
-			sb_add(m, "URG ");
-		if (th->ack)
-			sb_add(m, "ACK ");
-		if (th->psh)
-			sb_add(m, "PSH ");
-		if (th->rst)
-			sb_add(m, "RST ");
-		if (th->syn)
-			sb_add(m, "SYN ");
-		if (th->fin)
-			sb_add(m, "FIN ");
-		/* Max length: 11 "URGP=65535 " */
-		sb_add(m, "URGP=%u ", ntohs(th->urg_ptr));
-
-		if ((logflags & IPT_LOG_TCPOPT) &&
-		    th->doff * 4 > sizeof(struct tcphdr)) {
-			unsigned char _opt[4 * 15 - sizeof(struct tcphdr)];
-			const unsigned char *op;
-			unsigned int i, optsize;
-
-			optsize = th->doff * 4 - sizeof(struct tcphdr);
-			op = skb_header_pointer(skb,
-						iphoff+ih->ihl*4+sizeof(_tcph),
-						optsize, _opt);
-			if (op == NULL) {
-				sb_add(m, "TRUNCATED");
-				return;
-			}
-
-			/* Max length: 127 "OPT (" 15*4*2chars ") " */
-			sb_add(m, "OPT (");
-			for (i = 0; i < optsize; i++)
-				sb_add(m, "%02X", op[i]);
-			sb_add(m, ") ");
-		}
-		break;
-	}
-	case IPPROTO_UDP:
-	case IPPROTO_UDPLITE: {
-		struct udphdr _udph;
-		const struct udphdr *uh;
-
-		if (ih->protocol == IPPROTO_UDP)
-			/* Max length: 10 "PROTO=UDP "     */
-			sb_add(m, "PROTO=UDP " );
-		else	/* Max length: 14 "PROTO=UDPLITE " */
-			sb_add(m, "PROTO=UDPLITE ");
-
-		if (ntohs(ih->frag_off) & IP_OFFSET)
-			break;
-
-		/* Max length: 25 "INCOMPLETE [65535 bytes] " */
-		uh = skb_header_pointer(skb, iphoff+ih->ihl*4,
-					sizeof(_udph), &_udph);
-		if (uh == NULL) {
-			sb_add(m, "INCOMPLETE [%u bytes] ",
-			       skb->len - iphoff - ih->ihl*4);
-			break;
-		}
-
-		/* Max length: 20 "SPT=65535 DPT=65535 " */
-		sb_add(m, "SPT=%u DPT=%u LEN=%u ",
-		       ntohs(uh->source), ntohs(uh->dest),
-		       ntohs(uh->len));
-		break;
-	}
-	case IPPROTO_ICMP: {
-		struct icmphdr _icmph;
-		const struct icmphdr *ich;
-		static const size_t required_len[NR_ICMP_TYPES+1]
-			= { [ICMP_ECHOREPLY] = 4,
-			    [ICMP_DEST_UNREACH]
-			    = 8 + sizeof(struct iphdr),
-			    [ICMP_SOURCE_QUENCH]
-			    = 8 + sizeof(struct iphdr),
-			    [ICMP_REDIRECT]
-			    = 8 + sizeof(struct iphdr),
-			    [ICMP_ECHO] = 4,
-			    [ICMP_TIME_EXCEEDED]
-			    = 8 + sizeof(struct iphdr),
-			    [ICMP_PARAMETERPROB]
-			    = 8 + sizeof(struct iphdr),
-			    [ICMP_TIMESTAMP] = 20,
-			    [ICMP_TIMESTAMPREPLY] = 20,
-			    [ICMP_ADDRESS] = 12,
-			    [ICMP_ADDRESSREPLY] = 12 };
-
-		/* Max length: 11 "PROTO=ICMP " */
-		sb_add(m, "PROTO=ICMP ");
-
-		if (ntohs(ih->frag_off) & IP_OFFSET)
-			break;
-
-		/* Max length: 25 "INCOMPLETE [65535 bytes] " */
-		ich = skb_header_pointer(skb, iphoff + ih->ihl * 4,
-					 sizeof(_icmph), &_icmph);
-		if (ich == NULL) {
-			sb_add(m, "INCOMPLETE [%u bytes] ",
-			       skb->len - iphoff - ih->ihl*4);
-			break;
-		}
-
-		/* Max length: 18 "TYPE=255 CODE=255 " */
-		sb_add(m, "TYPE=%u CODE=%u ", ich->type, ich->code);
-
-		/* Max length: 25 "INCOMPLETE [65535 bytes] " */
-		if (ich->type <= NR_ICMP_TYPES &&
-		    required_len[ich->type] &&
-		    skb->len-iphoff-ih->ihl*4 < required_len[ich->type]) {
-			sb_add(m, "INCOMPLETE [%u bytes] ",
-			       skb->len - iphoff - ih->ihl*4);
-			break;
-		}
-
-		switch (ich->type) {
-		case ICMP_ECHOREPLY:
-		case ICMP_ECHO:
-			/* Max length: 19 "ID=65535 SEQ=65535 " */
-			sb_add(m, "ID=%u SEQ=%u ",
-			       ntohs(ich->un.echo.id),
-			       ntohs(ich->un.echo.sequence));
-			break;
-
-		case ICMP_PARAMETERPROB:
-			/* Max length: 14 "PARAMETER=255 " */
-			sb_add(m, "PARAMETER=%u ",
-			       ntohl(ich->un.gateway) >> 24);
-			break;
-		case ICMP_REDIRECT:
-			/* Max length: 24 "GATEWAY=255.255.255.255 " */
-			sb_add(m, "GATEWAY=%pI4 ", &ich->un.gateway);
-			/* Fall through */
-		case ICMP_DEST_UNREACH:
-		case ICMP_SOURCE_QUENCH:
-		case ICMP_TIME_EXCEEDED:
-			/* Max length: 3+maxlen */
-			if (!iphoff) { /* Only recurse once. */
-				sb_add(m, "[");
-				dump_packet(m, info, skb,
-					    iphoff + ih->ihl*4+sizeof(_icmph));
-				sb_add(m, "] ");
-			}
-
-			/* Max length: 10 "MTU=65535 " */
-			if (ich->type == ICMP_DEST_UNREACH &&
-			    ich->code == ICMP_FRAG_NEEDED)
-				sb_add(m, "MTU=%u ", ntohs(ich->un.frag.mtu));
-		}
-		break;
-	}
-	/* Max Length */
-	case IPPROTO_AH: {
-		struct ip_auth_hdr _ahdr;
-		const struct ip_auth_hdr *ah;
-
-		if (ntohs(ih->frag_off) & IP_OFFSET)
-			break;
-
-		/* Max length: 9 "PROTO=AH " */
-		sb_add(m, "PROTO=AH ");
-
-		/* Max length: 25 "INCOMPLETE [65535 bytes] " */
-		ah = skb_header_pointer(skb, iphoff+ih->ihl*4,
-					sizeof(_ahdr), &_ahdr);
-		if (ah == NULL) {
-			sb_add(m, "INCOMPLETE [%u bytes] ",
-			       skb->len - iphoff - ih->ihl*4);
-			break;
-		}
-
-		/* Length: 15 "SPI=0xF1234567 " */
-		sb_add(m, "SPI=0x%x ", ntohl(ah->spi));
-		break;
-	}
-	case IPPROTO_ESP: {
-		struct ip_esp_hdr _esph;
-		const struct ip_esp_hdr *eh;
-
-		/* Max length: 10 "PROTO=ESP " */
-		sb_add(m, "PROTO=ESP ");
-
-		if (ntohs(ih->frag_off) & IP_OFFSET)
-			break;
-
-		/* Max length: 25 "INCOMPLETE [65535 bytes] " */
-		eh = skb_header_pointer(skb, iphoff+ih->ihl*4,
-					sizeof(_esph), &_esph);
-		if (eh == NULL) {
-			sb_add(m, "INCOMPLETE [%u bytes] ",
-			       skb->len - iphoff - ih->ihl*4);
-			break;
-		}
-
-		/* Length: 15 "SPI=0xF1234567 " */
-		sb_add(m, "SPI=0x%x ", ntohl(eh->spi));
-		break;
-	}
-	/* Max length: 10 "PROTO 255 " */
-	default:
-		sb_add(m, "PROTO=%u ", ih->protocol);
-	}
-
-	/* Max length: 15 "UID=4294967295 " */
-	if ((logflags & IPT_LOG_UID) && !iphoff && skb->sk) {
-		read_lock_bh(&skb->sk->sk_callback_lock);
-		if (skb->sk->sk_socket && skb->sk->sk_socket->file)
-			sb_add(m, "UID=%u GID=%u ",
-				skb->sk->sk_socket->file->f_cred->fsuid,
-				skb->sk->sk_socket->file->f_cred->fsgid);
-		read_unlock_bh(&skb->sk->sk_callback_lock);
-	}
-
-	/* Max length: 16 "MARK=0xFFFFFFFF " */
-	if (!iphoff && skb->mark)
-		sb_add(m, "MARK=0x%x ", skb->mark);
-
-	/* Proto    Max log string length */
-	/* IP:      40+46+6+11+127 = 230 */
-	/* TCP:     10+max(25,20+30+13+9+32+11+127) = 252 */
-	/* UDP:     10+max(25,20) = 35 */
-	/* UDPLITE: 14+max(25,20) = 39 */
-	/* ICMP:    11+max(25, 18+25+max(19,14,24+3+n+10,3+n+10)) = 91+n */
-	/* ESP:     10+max(25)+15 = 50 */
-	/* AH:      9+max(25)+15 = 49 */
-	/* unknown: 10 */
-
-	/* (ICMP allows recursion one level deep) */
-	/* maxlen =  IP + ICMP +  IP + max(TCP,UDP,ICMP,unknown) */
-	/* maxlen = 230+   91  + 230 + 252 = 803 */
-}
-
-static void dump_mac_header(struct sbuff *m,
-			    const struct nf_loginfo *info,
-			    const struct sk_buff *skb)
-{
-	struct net_device *dev = skb->dev;
-	unsigned int logflags = 0;
-
-	if (info->type == NF_LOG_TYPE_LOG)
-		logflags = info->u.log.logflags;
-
-	if (!(logflags & IPT_LOG_MACDECODE))
-		goto fallback;
-
-	switch (dev->type) {
-	case ARPHRD_ETHER:
-		sb_add(m, "MACSRC=%pM MACDST=%pM MACPROTO=%04x ",
-		       eth_hdr(skb)->h_source, eth_hdr(skb)->h_dest,
-		       ntohs(eth_hdr(skb)->h_proto));
-		return;
-	default:
-		break;
-	}
-
-fallback:
-	sb_add(m, "MAC=");
-	if (dev->hard_header_len &&
-	    skb->mac_header != skb->network_header) {
-		const unsigned char *p = skb_mac_header(skb);
-		unsigned int i;
-
-		sb_add(m, "%02x", *p++);
-		for (i = 1; i < dev->hard_header_len; i++, p++)
-			sb_add(m, ":%02x", *p);
-	}
-	sb_add(m, " ");
-}
-
-static struct nf_loginfo default_loginfo = {
-	.type	= NF_LOG_TYPE_LOG,
-	.u = {
-		.log = {
-			.level    = 5,
-			.logflags = NF_LOG_MASK,
-		},
-	},
-};
-
-static void
-ipt_log_packet(u_int8_t pf,
-	       unsigned int hooknum,
-	       const struct sk_buff *skb,
-	       const struct net_device *in,
-	       const struct net_device *out,
-	       const struct nf_loginfo *loginfo,
-	       const char *prefix)
-{
-	struct sbuff *m = sb_open();
-
-	if (!loginfo)
-		loginfo = &default_loginfo;
-
-	sb_add(m, "<%d>%sIN=%s OUT=%s ", loginfo->u.log.level,
-	       prefix,
-	       in ? in->name : "",
-	       out ? out->name : "");
-#ifdef CONFIG_BRIDGE_NETFILTER
-	if (skb->nf_bridge) {
-		const struct net_device *physindev;
-		const struct net_device *physoutdev;
-
-		physindev = skb->nf_bridge->physindev;
-		if (physindev && in != physindev)
-			sb_add(m, "PHYSIN=%s ", physindev->name);
-		physoutdev = skb->nf_bridge->physoutdev;
-		if (physoutdev && out != physoutdev)
-			sb_add(m, "PHYSOUT=%s ", physoutdev->name);
-	}
-#endif
-
-	if (in != NULL)
-		dump_mac_header(m, loginfo, skb);
-
-	dump_packet(m, loginfo, skb, 0);
-
-	sb_close(m);
-}
-
-static unsigned int
-log_tg(struct sk_buff *skb, const struct xt_action_param *par)
-{
-	const struct ipt_log_info *loginfo = par->targinfo;
-	struct nf_loginfo li;
-
-	li.type = NF_LOG_TYPE_LOG;
-	li.u.log.level = loginfo->level;
-	li.u.log.logflags = loginfo->logflags;
-
-	ipt_log_packet(NFPROTO_IPV4, par->hooknum, skb, par->in, par->out, &li,
-		       loginfo->prefix);
-	return XT_CONTINUE;
-}
-
-static int log_tg_check(const struct xt_tgchk_param *par)
-{
-	const struct ipt_log_info *loginfo = par->targinfo;
-
-	if (loginfo->level >= 8) {
-		pr_debug("level %u >= 8\n", loginfo->level);
-		return -EINVAL;
-	}
-	if (loginfo->prefix[sizeof(loginfo->prefix)-1] != '\0') {
-		pr_debug("prefix is not null-terminated\n");
-		return -EINVAL;
-	}
-	return 0;
-}
-
-static struct xt_target log_tg_reg __read_mostly = {
-	.name		= "LOG",
-	.family		= NFPROTO_IPV4,
-	.target		= log_tg,
-	.targetsize	= sizeof(struct ipt_log_info),
-	.checkentry	= log_tg_check,
-	.me		= THIS_MODULE,
-};
-
-static struct nf_logger ipt_log_logger __read_mostly = {
-	.name		= "ipt_LOG",
-	.logfn		= &ipt_log_packet,
-	.me		= THIS_MODULE,
-};
-
-static int __init log_tg_init(void)
-{
-	int ret;
-
-	ret = xt_register_target(&log_tg_reg);
-	if (ret < 0)
-		return ret;
-	nf_log_register(NFPROTO_IPV4, &ipt_log_logger);
-	return 0;
-}
-
-static void __exit log_tg_exit(void)
-{
-	nf_log_unregister(&ipt_log_logger);
-	xt_unregister_target(&log_tg_reg);
-}
-
-module_init(log_tg_init);
-module_exit(log_tg_exit);
diff --git a/net/ipv6/netfilter/Kconfig b/net/ipv6/netfilter/Kconfig
index 9a68fb5..d33cddd 100644
--- a/net/ipv6/netfilter/Kconfig
+++ b/net/ipv6/netfilter/Kconfig
@@ -154,15 +154,6 @@ config IP6_NF_TARGET_HL
 	(e.g. when running oldconfig). It selects
 	CONFIG_NETFILTER_XT_TARGET_HL.
 
-config IP6_NF_TARGET_LOG
-	tristate "LOG target support"
-	default m if NETFILTER_ADVANCED=n
-	help
-	  This option adds a `LOG' target, which allows you to create rules in
-	  any iptables table which records the packet header to the syslog.
-
-	  To compile it as a module, choose M here.  If unsure, say N.
-
 config IP6_NF_FILTER
 	tristate "Packet filtering"
 	default m if NETFILTER_ADVANCED=n
diff --git a/net/ipv6/netfilter/Makefile b/net/ipv6/netfilter/Makefile
index 2eaed96..d4dfd0a 100644
--- a/net/ipv6/netfilter/Makefile
+++ b/net/ipv6/netfilter/Makefile
@@ -31,5 +31,4 @@ obj-$(CONFIG_IP6_NF_MATCH_RPFILTER) += ip6t_rpfilter.o
 obj-$(CONFIG_IP6_NF_MATCH_RT) += ip6t_rt.o
 
 # targets
-obj-$(CONFIG_IP6_NF_TARGET_LOG) += ip6t_LOG.o
 obj-$(CONFIG_IP6_NF_TARGET_REJECT) += ip6t_REJECT.o
diff --git a/net/ipv6/netfilter/ip6t_LOG.c b/net/ipv6/netfilter/ip6t_LOG.c
deleted file mode 100644
index e6af8d7..0000000
--- a/net/ipv6/netfilter/ip6t_LOG.c
+++ /dev/null
@@ -1,527 +0,0 @@
-/*
- * This is a module which is used for logging packets.
- */
-
-/* (C) 2001 Jan Rekorajski <baggins@pld.org.pl>
- * (C) 2002-2004 Netfilter Core Team <coreteam@netfilter.org>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- */
-#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
-#include <linux/module.h>
-#include <linux/skbuff.h>
-#include <linux/if_arp.h>
-#include <linux/ip.h>
-#include <linux/spinlock.h>
-#include <linux/icmpv6.h>
-#include <net/udp.h>
-#include <net/tcp.h>
-#include <net/ipv6.h>
-#include <linux/netfilter.h>
-#include <linux/netfilter/x_tables.h>
-#include <linux/netfilter_ipv6/ip6_tables.h>
-#include <net/netfilter/nf_log.h>
-#include <net/netfilter/xt_log.h>
-
-MODULE_AUTHOR("Jan Rekorajski <baggins@pld.org.pl>");
-MODULE_DESCRIPTION("Xtables: IPv6 packet logging to syslog");
-MODULE_LICENSE("GPL");
-
-struct in_device;
-#include <net/route.h>
-#include <linux/netfilter_ipv6/ip6t_LOG.h>
-
-/* One level of recursion won't kill us */
-static void dump_packet(struct sbuff *m,
-			const struct nf_loginfo *info,
-			const struct sk_buff *skb, unsigned int ip6hoff,
-			int recurse)
-{
-	u_int8_t currenthdr;
-	int fragment;
-	struct ipv6hdr _ip6h;
-	const struct ipv6hdr *ih;
-	unsigned int ptr;
-	unsigned int hdrlen = 0;
-	unsigned int logflags;
-
-	if (info->type == NF_LOG_TYPE_LOG)
-		logflags = info->u.log.logflags;
-	else
-		logflags = NF_LOG_MASK;
-
-	ih = skb_header_pointer(skb, ip6hoff, sizeof(_ip6h), &_ip6h);
-	if (ih == NULL) {
-		sb_add(m, "TRUNCATED");
-		return;
-	}
-
-	/* Max length: 88 "SRC=0000.0000.0000.0000.0000.0000.0000.0000 DST=0000.0000.0000.0000.0000.0000.0000.0000 " */
-	sb_add(m, "SRC=%pI6 DST=%pI6 ", &ih->saddr, &ih->daddr);
-
-	/* Max length: 44 "LEN=65535 TC=255 HOPLIMIT=255 FLOWLBL=FFFFF " */
-	sb_add(m, "LEN=%Zu TC=%u HOPLIMIT=%u FLOWLBL=%u ",
-	       ntohs(ih->payload_len) + sizeof(struct ipv6hdr),
-	       (ntohl(*(__be32 *)ih) & 0x0ff00000) >> 20,
-	       ih->hop_limit,
-	       (ntohl(*(__be32 *)ih) & 0x000fffff));
-
-	fragment = 0;
-	ptr = ip6hoff + sizeof(struct ipv6hdr);
-	currenthdr = ih->nexthdr;
-	while (currenthdr != NEXTHDR_NONE && ip6t_ext_hdr(currenthdr)) {
-		struct ipv6_opt_hdr _hdr;
-		const struct ipv6_opt_hdr *hp;
-
-		hp = skb_header_pointer(skb, ptr, sizeof(_hdr), &_hdr);
-		if (hp == NULL) {
-			sb_add(m, "TRUNCATED");
-			return;
-		}
-
-		/* Max length: 48 "OPT (...) " */
-		if (logflags & IP6T_LOG_IPOPT)
-			sb_add(m, "OPT ( ");
-
-		switch (currenthdr) {
-		case IPPROTO_FRAGMENT: {
-			struct frag_hdr _fhdr;
-			const struct frag_hdr *fh;
-
-			sb_add(m, "FRAG:");
-			fh = skb_header_pointer(skb, ptr, sizeof(_fhdr),
-						&_fhdr);
-			if (fh == NULL) {
-				sb_add(m, "TRUNCATED ");
-				return;
-			}
-
-			/* Max length: 6 "65535 " */
-			sb_add(m, "%u ", ntohs(fh->frag_off) & 0xFFF8);
-
-			/* Max length: 11 "INCOMPLETE " */
-			if (fh->frag_off & htons(0x0001))
-				sb_add(m, "INCOMPLETE ");
-
-			sb_add(m, "ID:%08x ", ntohl(fh->identification));
-
-			if (ntohs(fh->frag_off) & 0xFFF8)
-				fragment = 1;
-
-			hdrlen = 8;
-
-			break;
-		}
-		case IPPROTO_DSTOPTS:
-		case IPPROTO_ROUTING:
-		case IPPROTO_HOPOPTS:
-			if (fragment) {
-				if (logflags & IP6T_LOG_IPOPT)
-					sb_add(m, ")");
-				return;
-			}
-			hdrlen = ipv6_optlen(hp);
-			break;
-		/* Max Length */
-		case IPPROTO_AH:
-			if (logflags & IP6T_LOG_IPOPT) {
-				struct ip_auth_hdr _ahdr;
-				const struct ip_auth_hdr *ah;
-
-				/* Max length: 3 "AH " */
-				sb_add(m, "AH ");
-
-				if (fragment) {
-					sb_add(m, ")");
-					return;
-				}
-
-				ah = skb_header_pointer(skb, ptr, sizeof(_ahdr),
-							&_ahdr);
-				if (ah == NULL) {
-					/*
-					 * Max length: 26 "INCOMPLETE [65535
-					 *  bytes] )"
-					 */
-					sb_add(m, "INCOMPLETE [%u bytes] )",
-					       skb->len - ptr);
-					return;
-				}
-
-				/* Length: 15 "SPI=0xF1234567 */
-				sb_add(m, "SPI=0x%x ", ntohl(ah->spi));
-
-			}
-
-			hdrlen = (hp->hdrlen+2)<<2;
-			break;
-		case IPPROTO_ESP:
-			if (logflags & IP6T_LOG_IPOPT) {
-				struct ip_esp_hdr _esph;
-				const struct ip_esp_hdr *eh;
-
-				/* Max length: 4 "ESP " */
-				sb_add(m, "ESP ");
-
-				if (fragment) {
-					sb_add(m, ")");
-					return;
-				}
-
-				/*
-				 * Max length: 26 "INCOMPLETE [65535 bytes] )"
-				 */
-				eh = skb_header_pointer(skb, ptr, sizeof(_esph),
-							&_esph);
-				if (eh == NULL) {
-					sb_add(m, "INCOMPLETE [%u bytes] )",
-					       skb->len - ptr);
-					return;
-				}
-
-				/* Length: 16 "SPI=0xF1234567 )" */
-				sb_add(m, "SPI=0x%x )", ntohl(eh->spi) );
-
-			}
-			return;
-		default:
-			/* Max length: 20 "Unknown Ext Hdr 255" */
-			sb_add(m, "Unknown Ext Hdr %u", currenthdr);
-			return;
-		}
-		if (logflags & IP6T_LOG_IPOPT)
-			sb_add(m, ") ");
-
-		currenthdr = hp->nexthdr;
-		ptr += hdrlen;
-	}
-
-	switch (currenthdr) {
-	case IPPROTO_TCP: {
-		struct tcphdr _tcph;
-		const struct tcphdr *th;
-
-		/* Max length: 10 "PROTO=TCP " */
-		sb_add(m, "PROTO=TCP ");
-
-		if (fragment)
-			break;
-
-		/* Max length: 25 "INCOMPLETE [65535 bytes] " */
-		th = skb_header_pointer(skb, ptr, sizeof(_tcph), &_tcph);
-		if (th == NULL) {
-			sb_add(m, "INCOMPLETE [%u bytes] ", skb->len - ptr);
-			return;
-		}
-
-		/* Max length: 20 "SPT=65535 DPT=65535 " */
-		sb_add(m, "SPT=%u DPT=%u ",
-		       ntohs(th->source), ntohs(th->dest));
-		/* Max length: 30 "SEQ=4294967295 ACK=4294967295 " */
-		if (logflags & IP6T_LOG_TCPSEQ)
-			sb_add(m, "SEQ=%u ACK=%u ",
-			       ntohl(th->seq), ntohl(th->ack_seq));
-		/* Max length: 13 "WINDOW=65535 " */
-		sb_add(m, "WINDOW=%u ", ntohs(th->window));
-		/* Max length: 9 "RES=0x3C " */
-		sb_add(m, "RES=0x%02x ", (u_int8_t)(ntohl(tcp_flag_word(th) & TCP_RESERVED_BITS) >> 22));
-		/* Max length: 32 "CWR ECE URG ACK PSH RST SYN FIN " */
-		if (th->cwr)
-			sb_add(m, "CWR ");
-		if (th->ece)
-			sb_add(m, "ECE ");
-		if (th->urg)
-			sb_add(m, "URG ");
-		if (th->ack)
-			sb_add(m, "ACK ");
-		if (th->psh)
-			sb_add(m, "PSH ");
-		if (th->rst)
-			sb_add(m, "RST ");
-		if (th->syn)
-			sb_add(m, "SYN ");
-		if (th->fin)
-			sb_add(m, "FIN ");
-		/* Max length: 11 "URGP=65535 " */
-		sb_add(m, "URGP=%u ", ntohs(th->urg_ptr));
-
-		if ((logflags & IP6T_LOG_TCPOPT) &&
-		    th->doff * 4 > sizeof(struct tcphdr)) {
-			u_int8_t _opt[60 - sizeof(struct tcphdr)];
-			const u_int8_t *op;
-			unsigned int i;
-			unsigned int optsize = th->doff * 4
-					       - sizeof(struct tcphdr);
-
-			op = skb_header_pointer(skb,
-						ptr + sizeof(struct tcphdr),
-						optsize, _opt);
-			if (op == NULL) {
-				sb_add(m, "OPT (TRUNCATED)");
-				return;
-			}
-
-			/* Max length: 127 "OPT (" 15*4*2chars ") " */
-			sb_add(m, "OPT (");
-			for (i =0; i < optsize; i++)
-				sb_add(m, "%02X", op[i]);
-			sb_add(m, ") ");
-		}
-		break;
-	}
-	case IPPROTO_UDP:
-	case IPPROTO_UDPLITE: {
-		struct udphdr _udph;
-		const struct udphdr *uh;
-
-		if (currenthdr == IPPROTO_UDP)
-			/* Max length: 10 "PROTO=UDP "     */
-			sb_add(m, "PROTO=UDP " );
-		else	/* Max length: 14 "PROTO=UDPLITE " */
-			sb_add(m, "PROTO=UDPLITE ");
-
-		if (fragment)
-			break;
-
-		/* Max length: 25 "INCOMPLETE [65535 bytes] " */
-		uh = skb_header_pointer(skb, ptr, sizeof(_udph), &_udph);
-		if (uh == NULL) {
-			sb_add(m, "INCOMPLETE [%u bytes] ", skb->len - ptr);
-			return;
-		}
-
-		/* Max length: 20 "SPT=65535 DPT=65535 " */
-		sb_add(m, "SPT=%u DPT=%u LEN=%u ",
-		       ntohs(uh->source), ntohs(uh->dest),
-		       ntohs(uh->len));
-		break;
-	}
-	case IPPROTO_ICMPV6: {
-		struct icmp6hdr _icmp6h;
-		const struct icmp6hdr *ic;
-
-		/* Max length: 13 "PROTO=ICMPv6 " */
-		sb_add(m, "PROTO=ICMPv6 ");
-
-		if (fragment)
-			break;
-
-		/* Max length: 25 "INCOMPLETE [65535 bytes] " */
-		ic = skb_header_pointer(skb, ptr, sizeof(_icmp6h), &_icmp6h);
-		if (ic == NULL) {
-			sb_add(m, "INCOMPLETE [%u bytes] ", skb->len - ptr);
-			return;
-		}
-
-		/* Max length: 18 "TYPE=255 CODE=255 " */
-		sb_add(m, "TYPE=%u CODE=%u ", ic->icmp6_type, ic->icmp6_code);
-
-		switch (ic->icmp6_type) {
-		case ICMPV6_ECHO_REQUEST:
-		case ICMPV6_ECHO_REPLY:
-			/* Max length: 19 "ID=65535 SEQ=65535 " */
-			sb_add(m, "ID=%u SEQ=%u ",
-				ntohs(ic->icmp6_identifier),
-				ntohs(ic->icmp6_sequence));
-			break;
-		case ICMPV6_MGM_QUERY:
-		case ICMPV6_MGM_REPORT:
-		case ICMPV6_MGM_REDUCTION:
-			break;
-
-		case ICMPV6_PARAMPROB:
-			/* Max length: 17 "POINTER=ffffffff " */
-			sb_add(m, "POINTER=%08x ", ntohl(ic->icmp6_pointer));
-			/* Fall through */
-		case ICMPV6_DEST_UNREACH:
-		case ICMPV6_PKT_TOOBIG:
-		case ICMPV6_TIME_EXCEED:
-			/* Max length: 3+maxlen */
-			if (recurse) {
-				sb_add(m, "[");
-				dump_packet(m, info, skb,
-					    ptr + sizeof(_icmp6h), 0);
-				sb_add(m, "] ");
-			}
-
-			/* Max length: 10 "MTU=65535 " */
-			if (ic->icmp6_type == ICMPV6_PKT_TOOBIG)
-				sb_add(m, "MTU=%u ", ntohl(ic->icmp6_mtu));
-		}
-		break;
-	}
-	/* Max length: 10 "PROTO=255 " */
-	default:
-		sb_add(m, "PROTO=%u ", currenthdr);
-	}
-
-	/* Max length: 15 "UID=4294967295 " */
-	if ((logflags & IP6T_LOG_UID) && recurse && skb->sk) {
-		read_lock_bh(&skb->sk->sk_callback_lock);
-		if (skb->sk->sk_socket && skb->sk->sk_socket->file)
-			sb_add(m, "UID=%u GID=%u ",
-				skb->sk->sk_socket->file->f_cred->fsuid,
-				skb->sk->sk_socket->file->f_cred->fsgid);
-		read_unlock_bh(&skb->sk->sk_callback_lock);
-	}
-
-	/* Max length: 16 "MARK=0xFFFFFFFF " */
-	if (!recurse && skb->mark)
-		sb_add(m, "MARK=0x%x ", skb->mark);
-}
-
-static void dump_mac_header(struct sbuff *m,
-			    const struct nf_loginfo *info,
-			    const struct sk_buff *skb)
-{
-	struct net_device *dev = skb->dev;
-	unsigned int logflags = 0;
-
-	if (info->type == NF_LOG_TYPE_LOG)
-		logflags = info->u.log.logflags;
-
-	if (!(logflags & IP6T_LOG_MACDECODE))
-		goto fallback;
-
-	switch (dev->type) {
-	case ARPHRD_ETHER:
-		sb_add(m, "MACSRC=%pM MACDST=%pM MACPROTO=%04x ",
-		       eth_hdr(skb)->h_source, eth_hdr(skb)->h_dest,
-		       ntohs(eth_hdr(skb)->h_proto));
-		return;
-	default:
-		break;
-	}
-
-fallback:
-	sb_add(m, "MAC=");
-	if (dev->hard_header_len &&
-	    skb->mac_header != skb->network_header) {
-		const unsigned char *p = skb_mac_header(skb);
-		unsigned int len = dev->hard_header_len;
-		unsigned int i;
-
-		if (dev->type == ARPHRD_SIT &&
-		    (p -= ETH_HLEN) < skb->head)
-			p = NULL;
-
-		if (p != NULL) {
-			sb_add(m, "%02x", *p++);
-			for (i = 1; i < len; i++)
-				sb_add(m, ":%02x", *p++);
-		}
-		sb_add(m, " ");
-
-		if (dev->type == ARPHRD_SIT) {
-			const struct iphdr *iph =
-				(struct iphdr *)skb_mac_header(skb);
-			sb_add(m, "TUNNEL=%pI4->%pI4 ", &iph->saddr, &iph->daddr);
-		}
-	} else
-		sb_add(m, " ");
-}
-
-static struct nf_loginfo default_loginfo = {
-	.type	= NF_LOG_TYPE_LOG,
-	.u = {
-		.log = {
-			.level	  = 5,
-			.logflags = NF_LOG_MASK,
-		},
-	},
-};
-
-static void
-ip6t_log_packet(u_int8_t pf,
-		unsigned int hooknum,
-		const struct sk_buff *skb,
-		const struct net_device *in,
-		const struct net_device *out,
-		const struct nf_loginfo *loginfo,
-		const char *prefix)
-{
-	struct sbuff *m = sb_open();
-
-	if (!loginfo)
-		loginfo = &default_loginfo;
-
-	sb_add(m, "<%d>%sIN=%s OUT=%s ", loginfo->u.log.level,
-	       prefix,
-	       in ? in->name : "",
-	       out ? out->name : "");
-
-	if (in != NULL)
-		dump_mac_header(m, loginfo, skb);
-
-	dump_packet(m, loginfo, skb, skb_network_offset(skb), 1);
-
-	sb_close(m);
-}
-
-static unsigned int
-log_tg6(struct sk_buff *skb, const struct xt_action_param *par)
-{
-	const struct ip6t_log_info *loginfo = par->targinfo;
-	struct nf_loginfo li;
-
-	li.type = NF_LOG_TYPE_LOG;
-	li.u.log.level = loginfo->level;
-	li.u.log.logflags = loginfo->logflags;
-
-	ip6t_log_packet(NFPROTO_IPV6, par->hooknum, skb, par->in, par->out,
-			&li, loginfo->prefix);
-	return XT_CONTINUE;
-}
-
-
-static int log_tg6_check(const struct xt_tgchk_param *par)
-{
-	const struct ip6t_log_info *loginfo = par->targinfo;
-
-	if (loginfo->level >= 8) {
-		pr_debug("level %u >= 8\n", loginfo->level);
-		return -EINVAL;
-	}
-	if (loginfo->prefix[sizeof(loginfo->prefix)-1] != '\0') {
-		pr_debug("prefix not null-terminated\n");
-		return -EINVAL;
-	}
-	return 0;
-}
-
-static struct xt_target log_tg6_reg __read_mostly = {
-	.name 		= "LOG",
-	.family		= NFPROTO_IPV6,
-	.target 	= log_tg6,
-	.targetsize	= sizeof(struct ip6t_log_info),
-	.checkentry	= log_tg6_check,
-	.me 		= THIS_MODULE,
-};
-
-static struct nf_logger ip6t_logger __read_mostly = {
-	.name		= "ip6t_LOG",
-	.logfn		= &ip6t_log_packet,
-	.me		= THIS_MODULE,
-};
-
-static int __init log_tg6_init(void)
-{
-	int ret;
-
-	ret = xt_register_target(&log_tg6_reg);
-	if (ret < 0)
-		return ret;
-	nf_log_register(NFPROTO_IPV6, &ip6t_logger);
-	return 0;
-}
-
-static void __exit log_tg6_exit(void)
-{
-	nf_log_unregister(&ip6t_logger);
-	xt_unregister_target(&log_tg6_reg);
-}
-
-module_init(log_tg6_init);
-module_exit(log_tg6_exit);
diff --git a/net/netfilter/Kconfig b/net/netfilter/Kconfig
index f8ac4ef..b895d8b 100644
--- a/net/netfilter/Kconfig
+++ b/net/netfilter/Kconfig
@@ -524,6 +524,15 @@ config NETFILTER_XT_TARGET_LED
 	  For more information on the LEDs available on your system, see
 	  Documentation/leds/leds-class.txt
 
+config NETFILTER_XT_TARGET_LOG
+	tristate "LOG target support"
+	default m if NETFILTER_ADVANCED=n
+	help
+	  This option adds a `LOG' target, which allows you to create rules in
+	  any iptables table which records the packet header to the syslog.
+
+	  To compile it as a module, choose M here.  If unsure, say N.
+
 config NETFILTER_XT_TARGET_MARK
 	tristate '"MARK" target support'
 	depends on NETFILTER_ADVANCED
diff --git a/net/netfilter/Makefile b/net/netfilter/Makefile
index 40f4c3d..a28c2a6 100644
--- a/net/netfilter/Makefile
+++ b/net/netfilter/Makefile
@@ -58,6 +58,7 @@ obj-$(CONFIG_NETFILTER_XT_TARGET_CT) += xt_CT.o
 obj-$(CONFIG_NETFILTER_XT_TARGET_DSCP) += xt_DSCP.o
 obj-$(CONFIG_NETFILTER_XT_TARGET_HL) += xt_HL.o
 obj-$(CONFIG_NETFILTER_XT_TARGET_LED) += xt_LED.o
+obj-$(CONFIG_NETFILTER_XT_TARGET_LOG) += xt_LOG.o
 obj-$(CONFIG_NETFILTER_XT_TARGET_NFLOG) += xt_NFLOG.o
 obj-$(CONFIG_NETFILTER_XT_TARGET_NFQUEUE) += xt_NFQUEUE.o
 obj-$(CONFIG_NETFILTER_XT_TARGET_NOTRACK) += xt_NOTRACK.o
diff --git a/net/netfilter/xt_LOG.c b/net/netfilter/xt_LOG.c
new file mode 100644
index 0000000..1595608
--- /dev/null
+++ b/net/netfilter/xt_LOG.c
@@ -0,0 +1,921 @@
+/*
+ * This is a module which is used for logging packets.
+ */
+
+/* (C) 1999-2001 Paul `Rusty' Russell
+ * (C) 2002-2004 Netfilter Core Team <coreteam@netfilter.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+#include <linux/module.h>
+#include <linux/spinlock.h>
+#include <linux/skbuff.h>
+#include <linux/if_arp.h>
+#include <linux/ip.h>
+#include <net/ipv6.h>
+#include <net/icmp.h>
+#include <net/udp.h>
+#include <net/tcp.h>
+#include <net/route.h>
+
+#include <linux/netfilter.h>
+#include <linux/netfilter/x_tables.h>
+#include <linux/netfilter/xt_LOG.h>
+#include <linux/netfilter_ipv6/ip6_tables.h>
+#include <net/netfilter/nf_log.h>
+#include <net/netfilter/xt_log.h>
+
+static struct nf_loginfo default_loginfo = {
+	.type	= NF_LOG_TYPE_LOG,
+	.u = {
+		.log = {
+			.level    = 5,
+			.logflags = NF_LOG_MASK,
+		},
+	},
+};
+
+static int dump_udp_header(struct sbuff *m, const struct sk_buff *skb,
+			   u8 proto, int fragment, unsigned int offset)
+{
+	struct udphdr _udph;
+	const struct udphdr *uh;
+
+	if (proto == IPPROTO_UDP)
+		/* Max length: 10 "PROTO=UDP "     */
+		sb_add(m, "PROTO=UDP ");
+	else	/* Max length: 14 "PROTO=UDPLITE " */
+		sb_add(m, "PROTO=UDPLITE ");
+
+	if (fragment)
+		goto out;
+
+	/* Max length: 25 "INCOMPLETE [65535 bytes] " */
+	uh = skb_header_pointer(skb, offset, sizeof(_udph), &_udph);
+	if (uh == NULL) {
+		sb_add(m, "INCOMPLETE [%u bytes] ", skb->len - offset);
+
+		return 1;
+	}
+
+	/* Max length: 20 "SPT=65535 DPT=65535 " */
+	sb_add(m, "SPT=%u DPT=%u LEN=%u ", ntohs(uh->source), ntohs(uh->dest),
+		ntohs(uh->len));
+
+out:
+	return 0;
+}
+
+static int dump_tcp_header(struct sbuff *m, const struct sk_buff *skb,
+			   u8 proto, int fragment, unsigned int offset,
+			   unsigned int logflags)
+{
+	struct tcphdr _tcph;
+	const struct tcphdr *th;
+
+	/* Max length: 10 "PROTO=TCP " */
+	sb_add(m, "PROTO=TCP ");
+
+	if (fragment)
+		return 0;
+
+	/* Max length: 25 "INCOMPLETE [65535 bytes] " */
+	th = skb_header_pointer(skb, offset, sizeof(_tcph), &_tcph);
+	if (th == NULL) {
+		sb_add(m, "INCOMPLETE [%u bytes] ", skb->len - offset);
+		return 1;
+	}
+
+	/* Max length: 20 "SPT=65535 DPT=65535 " */
+	sb_add(m, "SPT=%u DPT=%u ", ntohs(th->source), ntohs(th->dest));
+	/* Max length: 30 "SEQ=4294967295 ACK=4294967295 " */
+	if (logflags & XT_LOG_TCPSEQ)
+		sb_add(m, "SEQ=%u ACK=%u ", ntohl(th->seq), ntohl(th->ack_seq));
+
+	/* Max length: 13 "WINDOW=65535 " */
+	sb_add(m, "WINDOW=%u ", ntohs(th->window));
+	/* Max length: 9 "RES=0x3C " */
+	sb_add(m, "RES=0x%02x ", (u_int8_t)(ntohl(tcp_flag_word(th) &
+					    TCP_RESERVED_BITS) >> 22));
+	/* Max length: 32 "CWR ECE URG ACK PSH RST SYN FIN " */
+	if (th->cwr)
+		sb_add(m, "CWR ");
+	if (th->ece)
+		sb_add(m, "ECE ");
+	if (th->urg)
+		sb_add(m, "URG ");
+	if (th->ack)
+		sb_add(m, "ACK ");
+	if (th->psh)
+		sb_add(m, "PSH ");
+	if (th->rst)
+		sb_add(m, "RST ");
+	if (th->syn)
+		sb_add(m, "SYN ");
+	if (th->fin)
+		sb_add(m, "FIN ");
+	/* Max length: 11 "URGP=65535 " */
+	sb_add(m, "URGP=%u ", ntohs(th->urg_ptr));
+
+	if ((logflags & XT_LOG_TCPOPT) && th->doff*4 > sizeof(struct tcphdr)) {
+		u_int8_t _opt[60 - sizeof(struct tcphdr)];
+		const u_int8_t *op;
+		unsigned int i;
+		unsigned int optsize = th->doff*4 - sizeof(struct tcphdr);
+
+		op = skb_header_pointer(skb, offset + sizeof(struct tcphdr),
+					optsize, _opt);
+		if (op == NULL) {
+			sb_add(m, "OPT (TRUNCATED)");
+			return 1;
+		}
+
+		/* Max length: 127 "OPT (" 15*4*2chars ") " */
+		sb_add(m, "OPT (");
+		for (i = 0; i < optsize; i++)
+			sb_add(m, "%02X", op[i]);
+
+		sb_add(m, ") ");
+	}
+
+	return 0;
+}
+
+/* One level of recursion won't kill us */
+static void dump_ipv4_packet(struct sbuff *m,
+			const struct nf_loginfo *info,
+			const struct sk_buff *skb,
+			unsigned int iphoff)
+{
+	struct iphdr _iph;
+	const struct iphdr *ih;
+	unsigned int logflags;
+
+	if (info->type == NF_LOG_TYPE_LOG)
+		logflags = info->u.log.logflags;
+	else
+		logflags = NF_LOG_MASK;
+
+	ih = skb_header_pointer(skb, iphoff, sizeof(_iph), &_iph);
+	if (ih == NULL) {
+		sb_add(m, "TRUNCATED");
+		return;
+	}
+
+	/* Important fields:
+	 * TOS, len, DF/MF, fragment offset, TTL, src, dst, options. */
+	/* Max length: 40 "SRC=255.255.255.255 DST=255.255.255.255 " */
+	sb_add(m, "SRC=%pI4 DST=%pI4 ",
+	       &ih->saddr, &ih->daddr);
+
+	/* Max length: 46 "LEN=65535 TOS=0xFF PREC=0xFF TTL=255 ID=65535 " */
+	sb_add(m, "LEN=%u TOS=0x%02X PREC=0x%02X TTL=%u ID=%u ",
+	       ntohs(ih->tot_len), ih->tos & IPTOS_TOS_MASK,
+	       ih->tos & IPTOS_PREC_MASK, ih->ttl, ntohs(ih->id));
+
+	/* Max length: 6 "CE DF MF " */
+	if (ntohs(ih->frag_off) & IP_CE)
+		sb_add(m, "CE ");
+	if (ntohs(ih->frag_off) & IP_DF)
+		sb_add(m, "DF ");
+	if (ntohs(ih->frag_off) & IP_MF)
+		sb_add(m, "MF ");
+
+	/* Max length: 11 "FRAG:65535 " */
+	if (ntohs(ih->frag_off) & IP_OFFSET)
+		sb_add(m, "FRAG:%u ", ntohs(ih->frag_off) & IP_OFFSET);
+
+	if ((logflags & XT_LOG_IPOPT) &&
+	    ih->ihl * 4 > sizeof(struct iphdr)) {
+		const unsigned char *op;
+		unsigned char _opt[4 * 15 - sizeof(struct iphdr)];
+		unsigned int i, optsize;
+
+		optsize = ih->ihl * 4 - sizeof(struct iphdr);
+		op = skb_header_pointer(skb, iphoff+sizeof(_iph),
+					optsize, _opt);
+		if (op == NULL) {
+			sb_add(m, "TRUNCATED");
+			return;
+		}
+
+		/* Max length: 127 "OPT (" 15*4*2chars ") " */
+		sb_add(m, "OPT (");
+		for (i = 0; i < optsize; i++)
+			sb_add(m, "%02X", op[i]);
+		sb_add(m, ") ");
+	}
+
+	switch (ih->protocol) {
+	case IPPROTO_TCP:
+		if (dump_tcp_header(m, skb, ih->protocol,
+				    ntohs(ih->frag_off) & IP_OFFSET,
+				    iphoff+ih->ihl*4, logflags))
+			return;
+	case IPPROTO_UDP:
+	case IPPROTO_UDPLITE:
+		if (dump_udp_header(m, skb, ih->protocol,
+				    ntohs(ih->frag_off) & IP_OFFSET,
+				    iphoff+ih->ihl*4))
+			return;
+	case IPPROTO_ICMP: {
+		struct icmphdr _icmph;
+		const struct icmphdr *ich;
+		static const size_t required_len[NR_ICMP_TYPES+1]
+			= { [ICMP_ECHOREPLY] = 4,
+			    [ICMP_DEST_UNREACH]
+			    = 8 + sizeof(struct iphdr),
+			    [ICMP_SOURCE_QUENCH]
+			    = 8 + sizeof(struct iphdr),
+			    [ICMP_REDIRECT]
+			    = 8 + sizeof(struct iphdr),
+			    [ICMP_ECHO] = 4,
+			    [ICMP_TIME_EXCEEDED]
+			    = 8 + sizeof(struct iphdr),
+			    [ICMP_PARAMETERPROB]
+			    = 8 + sizeof(struct iphdr),
+			    [ICMP_TIMESTAMP] = 20,
+			    [ICMP_TIMESTAMPREPLY] = 20,
+			    [ICMP_ADDRESS] = 12,
+			    [ICMP_ADDRESSREPLY] = 12 };
+
+		/* Max length: 11 "PROTO=ICMP " */
+		sb_add(m, "PROTO=ICMP ");
+
+		if (ntohs(ih->frag_off) & IP_OFFSET)
+			break;
+
+		/* Max length: 25 "INCOMPLETE [65535 bytes] " */
+		ich = skb_header_pointer(skb, iphoff + ih->ihl * 4,
+					 sizeof(_icmph), &_icmph);
+		if (ich == NULL) {
+			sb_add(m, "INCOMPLETE [%u bytes] ",
+			       skb->len - iphoff - ih->ihl*4);
+			break;
+		}
+
+		/* Max length: 18 "TYPE=255 CODE=255 " */
+		sb_add(m, "TYPE=%u CODE=%u ", ich->type, ich->code);
+
+		/* Max length: 25 "INCOMPLETE [65535 bytes] " */
+		if (ich->type <= NR_ICMP_TYPES &&
+		    required_len[ich->type] &&
+		    skb->len-iphoff-ih->ihl*4 < required_len[ich->type]) {
+			sb_add(m, "INCOMPLETE [%u bytes] ",
+			       skb->len - iphoff - ih->ihl*4);
+			break;
+		}
+
+		switch (ich->type) {
+		case ICMP_ECHOREPLY:
+		case ICMP_ECHO:
+			/* Max length: 19 "ID=65535 SEQ=65535 " */
+			sb_add(m, "ID=%u SEQ=%u ",
+			       ntohs(ich->un.echo.id),
+			       ntohs(ich->un.echo.sequence));
+			break;
+
+		case ICMP_PARAMETERPROB:
+			/* Max length: 14 "PARAMETER=255 " */
+			sb_add(m, "PARAMETER=%u ",
+			       ntohl(ich->un.gateway) >> 24);
+			break;
+		case ICMP_REDIRECT:
+			/* Max length: 24 "GATEWAY=255.255.255.255 " */
+			sb_add(m, "GATEWAY=%pI4 ", &ich->un.gateway);
+			/* Fall through */
+		case ICMP_DEST_UNREACH:
+		case ICMP_SOURCE_QUENCH:
+		case ICMP_TIME_EXCEEDED:
+			/* Max length: 3+maxlen */
+			if (!iphoff) { /* Only recurse once. */
+				sb_add(m, "[");
+				dump_ipv4_packet(m, info, skb,
+					    iphoff + ih->ihl*4+sizeof(_icmph));
+				sb_add(m, "] ");
+			}
+
+			/* Max length: 10 "MTU=65535 " */
+			if (ich->type == ICMP_DEST_UNREACH &&
+			    ich->code == ICMP_FRAG_NEEDED)
+				sb_add(m, "MTU=%u ", ntohs(ich->un.frag.mtu));
+		}
+		break;
+	}
+	/* Max Length */
+	case IPPROTO_AH: {
+		struct ip_auth_hdr _ahdr;
+		const struct ip_auth_hdr *ah;
+
+		if (ntohs(ih->frag_off) & IP_OFFSET)
+			break;
+
+		/* Max length: 9 "PROTO=AH " */
+		sb_add(m, "PROTO=AH ");
+
+		/* Max length: 25 "INCOMPLETE [65535 bytes] " */
+		ah = skb_header_pointer(skb, iphoff+ih->ihl*4,
+					sizeof(_ahdr), &_ahdr);
+		if (ah == NULL) {
+			sb_add(m, "INCOMPLETE [%u bytes] ",
+			       skb->len - iphoff - ih->ihl*4);
+			break;
+		}
+
+		/* Length: 15 "SPI=0xF1234567 " */
+		sb_add(m, "SPI=0x%x ", ntohl(ah->spi));
+		break;
+	}
+	case IPPROTO_ESP: {
+		struct ip_esp_hdr _esph;
+		const struct ip_esp_hdr *eh;
+
+		/* Max length: 10 "PROTO=ESP " */
+		sb_add(m, "PROTO=ESP ");
+
+		if (ntohs(ih->frag_off) & IP_OFFSET)
+			break;
+
+		/* Max length: 25 "INCOMPLETE [65535 bytes] " */
+		eh = skb_header_pointer(skb, iphoff+ih->ihl*4,
+					sizeof(_esph), &_esph);
+		if (eh == NULL) {
+			sb_add(m, "INCOMPLETE [%u bytes] ",
+			       skb->len - iphoff - ih->ihl*4);
+			break;
+		}
+
+		/* Length: 15 "SPI=0xF1234567 " */
+		sb_add(m, "SPI=0x%x ", ntohl(eh->spi));
+		break;
+	}
+	/* Max length: 10 "PROTO 255 " */
+	default:
+		sb_add(m, "PROTO=%u ", ih->protocol);
+	}
+
+	/* Max length: 15 "UID=4294967295 " */
+	if ((logflags & XT_LOG_UID) && !iphoff && skb->sk) {
+		read_lock_bh(&skb->sk->sk_callback_lock);
+		if (skb->sk->sk_socket && skb->sk->sk_socket->file)
+			sb_add(m, "UID=%u GID=%u ",
+				skb->sk->sk_socket->file->f_cred->fsuid,
+				skb->sk->sk_socket->file->f_cred->fsgid);
+		read_unlock_bh(&skb->sk->sk_callback_lock);
+	}
+
+	/* Max length: 16 "MARK=0xFFFFFFFF " */
+	if (!iphoff && skb->mark)
+		sb_add(m, "MARK=0x%x ", skb->mark);
+
+	/* Proto    Max log string length */
+	/* IP:      40+46+6+11+127 = 230 */
+	/* TCP:     10+max(25,20+30+13+9+32+11+127) = 252 */
+	/* UDP:     10+max(25,20) = 35 */
+	/* UDPLITE: 14+max(25,20) = 39 */
+	/* ICMP:    11+max(25, 18+25+max(19,14,24+3+n+10,3+n+10)) = 91+n */
+	/* ESP:     10+max(25)+15 = 50 */
+	/* AH:      9+max(25)+15 = 49 */
+	/* unknown: 10 */
+
+	/* (ICMP allows recursion one level deep) */
+	/* maxlen =  IP + ICMP +  IP + max(TCP,UDP,ICMP,unknown) */
+	/* maxlen = 230+   91  + 230 + 252 = 803 */
+}
+
+static void dump_ipv4_mac_header(struct sbuff *m,
+			    const struct nf_loginfo *info,
+			    const struct sk_buff *skb)
+{
+	struct net_device *dev = skb->dev;
+	unsigned int logflags = 0;
+
+	if (info->type == NF_LOG_TYPE_LOG)
+		logflags = info->u.log.logflags;
+
+	if (!(logflags & XT_LOG_MACDECODE))
+		goto fallback;
+
+	switch (dev->type) {
+	case ARPHRD_ETHER:
+		sb_add(m, "MACSRC=%pM MACDST=%pM MACPROTO=%04x ",
+		       eth_hdr(skb)->h_source, eth_hdr(skb)->h_dest,
+		       ntohs(eth_hdr(skb)->h_proto));
+		return;
+	default:
+		break;
+	}
+
+fallback:
+	sb_add(m, "MAC=");
+	if (dev->hard_header_len &&
+	    skb->mac_header != skb->network_header) {
+		const unsigned char *p = skb_mac_header(skb);
+		unsigned int i;
+
+		sb_add(m, "%02x", *p++);
+		for (i = 1; i < dev->hard_header_len; i++, p++)
+			sb_add(m, ":%02x", *p);
+	}
+	sb_add(m, " ");
+}
+
+static void
+log_packet_common(struct sbuff *m,
+		  u_int8_t pf,
+		  unsigned int hooknum,
+		  const struct sk_buff *skb,
+		  const struct net_device *in,
+		  const struct net_device *out,
+		  const struct nf_loginfo *loginfo,
+		  const char *prefix)
+{
+	sb_add(m, "<%d>%sIN=%s OUT=%s ", loginfo->u.log.level,
+	       prefix,
+	       in ? in->name : "",
+	       out ? out->name : "");
+#ifdef CONFIG_BRIDGE_NETFILTER
+	if (skb->nf_bridge) {
+		const struct net_device *physindev;
+		const struct net_device *physoutdev;
+
+		physindev = skb->nf_bridge->physindev;
+		if (physindev && in != physindev)
+			sb_add(m, "PHYSIN=%s ", physindev->name);
+		physoutdev = skb->nf_bridge->physoutdev;
+		if (physoutdev && out != physoutdev)
+			sb_add(m, "PHYSOUT=%s ", physoutdev->name);
+	}
+#endif
+}
+
+
+static void
+ipt_log_packet(u_int8_t pf,
+	       unsigned int hooknum,
+	       const struct sk_buff *skb,
+	       const struct net_device *in,
+	       const struct net_device *out,
+	       const struct nf_loginfo *loginfo,
+	       const char *prefix)
+{
+	struct sbuff *m = sb_open();
+
+	if (!loginfo)
+		loginfo = &default_loginfo;
+
+	log_packet_common(m, pf, hooknum, skb, in, out, loginfo, prefix);
+
+	if (in != NULL)
+		dump_ipv4_mac_header(m, loginfo, skb);
+
+	dump_ipv4_packet(m, loginfo, skb, 0);
+
+	sb_close(m);
+}
+
+#if IS_ENABLED(CONFIG_IPV6)
+/* One level of recursion won't kill us */
+static void dump_ipv6_packet(struct sbuff *m,
+			const struct nf_loginfo *info,
+			const struct sk_buff *skb, unsigned int ip6hoff,
+			int recurse)
+{
+	u_int8_t currenthdr;
+	int fragment;
+	struct ipv6hdr _ip6h;
+	const struct ipv6hdr *ih;
+	unsigned int ptr;
+	unsigned int hdrlen = 0;
+	unsigned int logflags;
+
+	if (info->type == NF_LOG_TYPE_LOG)
+		logflags = info->u.log.logflags;
+	else
+		logflags = NF_LOG_MASK;
+
+	ih = skb_header_pointer(skb, ip6hoff, sizeof(_ip6h), &_ip6h);
+	if (ih == NULL) {
+		sb_add(m, "TRUNCATED");
+		return;
+	}
+
+	/* Max length: 88 "SRC=0000.0000.0000.0000.0000.0000.0000.0000 DST=0000.0000.0000.0000.0000.0000.0000.0000 " */
+	sb_add(m, "SRC=%pI6 DST=%pI6 ", &ih->saddr, &ih->daddr);
+
+	/* Max length: 44 "LEN=65535 TC=255 HOPLIMIT=255 FLOWLBL=FFFFF " */
+	sb_add(m, "LEN=%Zu TC=%u HOPLIMIT=%u FLOWLBL=%u ",
+	       ntohs(ih->payload_len) + sizeof(struct ipv6hdr),
+	       (ntohl(*(__be32 *)ih) & 0x0ff00000) >> 20,
+	       ih->hop_limit,
+	       (ntohl(*(__be32 *)ih) & 0x000fffff));
+
+	fragment = 0;
+	ptr = ip6hoff + sizeof(struct ipv6hdr);
+	currenthdr = ih->nexthdr;
+	while (currenthdr != NEXTHDR_NONE && ip6t_ext_hdr(currenthdr)) {
+		struct ipv6_opt_hdr _hdr;
+		const struct ipv6_opt_hdr *hp;
+
+		hp = skb_header_pointer(skb, ptr, sizeof(_hdr), &_hdr);
+		if (hp == NULL) {
+			sb_add(m, "TRUNCATED");
+			return;
+		}
+
+		/* Max length: 48 "OPT (...) " */
+		if (logflags & XT_LOG_IPOPT)
+			sb_add(m, "OPT ( ");
+
+		switch (currenthdr) {
+		case IPPROTO_FRAGMENT: {
+			struct frag_hdr _fhdr;
+			const struct frag_hdr *fh;
+
+			sb_add(m, "FRAG:");
+			fh = skb_header_pointer(skb, ptr, sizeof(_fhdr),
+						&_fhdr);
+			if (fh == NULL) {
+				sb_add(m, "TRUNCATED ");
+				return;
+			}
+
+			/* Max length: 6 "65535 " */
+			sb_add(m, "%u ", ntohs(fh->frag_off) & 0xFFF8);
+
+			/* Max length: 11 "INCOMPLETE " */
+			if (fh->frag_off & htons(0x0001))
+				sb_add(m, "INCOMPLETE ");
+
+			sb_add(m, "ID:%08x ", ntohl(fh->identification));
+
+			if (ntohs(fh->frag_off) & 0xFFF8)
+				fragment = 1;
+
+			hdrlen = 8;
+
+			break;
+		}
+		case IPPROTO_DSTOPTS:
+		case IPPROTO_ROUTING:
+		case IPPROTO_HOPOPTS:
+			if (fragment) {
+				if (logflags & XT_LOG_IPOPT)
+					sb_add(m, ")");
+				return;
+			}
+			hdrlen = ipv6_optlen(hp);
+			break;
+		/* Max Length */
+		case IPPROTO_AH:
+			if (logflags & XT_LOG_IPOPT) {
+				struct ip_auth_hdr _ahdr;
+				const struct ip_auth_hdr *ah;
+
+				/* Max length: 3 "AH " */
+				sb_add(m, "AH ");
+
+				if (fragment) {
+					sb_add(m, ")");
+					return;
+				}
+
+				ah = skb_header_pointer(skb, ptr, sizeof(_ahdr),
+							&_ahdr);
+				if (ah == NULL) {
+					/*
+					 * Max length: 26 "INCOMPLETE [65535
+					 *  bytes] )"
+					 */
+					sb_add(m, "INCOMPLETE [%u bytes] )",
+					       skb->len - ptr);
+					return;
+				}
+
+				/* Length: 15 "SPI=0xF1234567 */
+				sb_add(m, "SPI=0x%x ", ntohl(ah->spi));
+
+			}
+
+			hdrlen = (hp->hdrlen+2)<<2;
+			break;
+		case IPPROTO_ESP:
+			if (logflags & XT_LOG_IPOPT) {
+				struct ip_esp_hdr _esph;
+				const struct ip_esp_hdr *eh;
+
+				/* Max length: 4 "ESP " */
+				sb_add(m, "ESP ");
+
+				if (fragment) {
+					sb_add(m, ")");
+					return;
+				}
+
+				/*
+				 * Max length: 26 "INCOMPLETE [65535 bytes] )"
+				 */
+				eh = skb_header_pointer(skb, ptr, sizeof(_esph),
+							&_esph);
+				if (eh == NULL) {
+					sb_add(m, "INCOMPLETE [%u bytes] )",
+					       skb->len - ptr);
+					return;
+				}
+
+				/* Length: 16 "SPI=0xF1234567 )" */
+				sb_add(m, "SPI=0x%x )", ntohl(eh->spi));
+
+			}
+			return;
+		default:
+			/* Max length: 20 "Unknown Ext Hdr 255" */
+			sb_add(m, "Unknown Ext Hdr %u", currenthdr);
+			return;
+		}
+		if (logflags & XT_LOG_IPOPT)
+			sb_add(m, ") ");
+
+		currenthdr = hp->nexthdr;
+		ptr += hdrlen;
+	}
+
+	switch (currenthdr) {
+	case IPPROTO_TCP:
+		if (dump_tcp_header(m, skb, currenthdr, fragment, ptr,
+		    logflags))
+			return;
+	case IPPROTO_UDP:
+	case IPPROTO_UDPLITE:
+		if (dump_udp_header(m, skb, currenthdr, fragment, ptr))
+			return;
+	case IPPROTO_ICMPV6: {
+		struct icmp6hdr _icmp6h;
+		const struct icmp6hdr *ic;
+
+		/* Max length: 13 "PROTO=ICMPv6 " */
+		sb_add(m, "PROTO=ICMPv6 ");
+
+		if (fragment)
+			break;
+
+		/* Max length: 25 "INCOMPLETE [65535 bytes] " */
+		ic = skb_header_pointer(skb, ptr, sizeof(_icmp6h), &_icmp6h);
+		if (ic == NULL) {
+			sb_add(m, "INCOMPLETE [%u bytes] ", skb->len - ptr);
+			return;
+		}
+
+		/* Max length: 18 "TYPE=255 CODE=255 " */
+		sb_add(m, "TYPE=%u CODE=%u ", ic->icmp6_type, ic->icmp6_code);
+
+		switch (ic->icmp6_type) {
+		case ICMPV6_ECHO_REQUEST:
+		case ICMPV6_ECHO_REPLY:
+			/* Max length: 19 "ID=65535 SEQ=65535 " */
+			sb_add(m, "ID=%u SEQ=%u ",
+				ntohs(ic->icmp6_identifier),
+				ntohs(ic->icmp6_sequence));
+			break;
+		case ICMPV6_MGM_QUERY:
+		case ICMPV6_MGM_REPORT:
+		case ICMPV6_MGM_REDUCTION:
+			break;
+
+		case ICMPV6_PARAMPROB:
+			/* Max length: 17 "POINTER=ffffffff " */
+			sb_add(m, "POINTER=%08x ", ntohl(ic->icmp6_pointer));
+			/* Fall through */
+		case ICMPV6_DEST_UNREACH:
+		case ICMPV6_PKT_TOOBIG:
+		case ICMPV6_TIME_EXCEED:
+			/* Max length: 3+maxlen */
+			if (recurse) {
+				sb_add(m, "[");
+				dump_ipv6_packet(m, info, skb,
+					    ptr + sizeof(_icmp6h), 0);
+				sb_add(m, "] ");
+			}
+
+			/* Max length: 10 "MTU=65535 " */
+			if (ic->icmp6_type == ICMPV6_PKT_TOOBIG)
+				sb_add(m, "MTU=%u ", ntohl(ic->icmp6_mtu));
+		}
+		break;
+	}
+	/* Max length: 10 "PROTO=255 " */
+	default:
+		sb_add(m, "PROTO=%u ", currenthdr);
+	}
+
+	/* Max length: 15 "UID=4294967295 " */
+	if ((logflags & XT_LOG_UID) && recurse && skb->sk) {
+		read_lock_bh(&skb->sk->sk_callback_lock);
+		if (skb->sk->sk_socket && skb->sk->sk_socket->file)
+			sb_add(m, "UID=%u GID=%u ",
+				skb->sk->sk_socket->file->f_cred->fsuid,
+				skb->sk->sk_socket->file->f_cred->fsgid);
+		read_unlock_bh(&skb->sk->sk_callback_lock);
+	}
+
+	/* Max length: 16 "MARK=0xFFFFFFFF " */
+	if (!recurse && skb->mark)
+		sb_add(m, "MARK=0x%x ", skb->mark);
+}
+
+static void dump_ipv6_mac_header(struct sbuff *m,
+			    const struct nf_loginfo *info,
+			    const struct sk_buff *skb)
+{
+	struct net_device *dev = skb->dev;
+	unsigned int logflags = 0;
+
+	if (info->type == NF_LOG_TYPE_LOG)
+		logflags = info->u.log.logflags;
+
+	if (!(logflags & XT_LOG_MACDECODE))
+		goto fallback;
+
+	switch (dev->type) {
+	case ARPHRD_ETHER:
+		sb_add(m, "MACSRC=%pM MACDST=%pM MACPROTO=%04x ",
+		       eth_hdr(skb)->h_source, eth_hdr(skb)->h_dest,
+		       ntohs(eth_hdr(skb)->h_proto));
+		return;
+	default:
+		break;
+	}
+
+fallback:
+	sb_add(m, "MAC=");
+	if (dev->hard_header_len &&
+	    skb->mac_header != skb->network_header) {
+		const unsigned char *p = skb_mac_header(skb);
+		unsigned int len = dev->hard_header_len;
+		unsigned int i;
+
+		if (dev->type == ARPHRD_SIT) {
+			p -= ETH_HLEN;
+
+			if (p < skb->head)
+				p = NULL;
+		}
+
+		if (p != NULL) {
+			sb_add(m, "%02x", *p++);
+			for (i = 1; i < len; i++)
+				sb_add(m, ":%02x", *p++);
+		}
+		sb_add(m, " ");
+
+		if (dev->type == ARPHRD_SIT) {
+			const struct iphdr *iph =
+				(struct iphdr *)skb_mac_header(skb);
+			sb_add(m, "TUNNEL=%pI4->%pI4 ", &iph->saddr,
+			       &iph->daddr);
+		}
+	} else
+		sb_add(m, " ");
+}
+
+static void
+ip6t_log_packet(u_int8_t pf,
+		unsigned int hooknum,
+		const struct sk_buff *skb,
+		const struct net_device *in,
+		const struct net_device *out,
+		const struct nf_loginfo *loginfo,
+		const char *prefix)
+{
+	struct sbuff *m = sb_open();
+
+	if (!loginfo)
+		loginfo = &default_loginfo;
+
+	log_packet_common(m, pf, hooknum, skb, in, out, loginfo, prefix);
+
+	if (in != NULL)
+		dump_ipv6_mac_header(m, loginfo, skb);
+
+	dump_ipv6_packet(m, loginfo, skb, skb_network_offset(skb), 1);
+
+	sb_close(m);
+}
+#endif
+
+static unsigned int
+log_tg(struct sk_buff *skb, const struct xt_action_param *par)
+{
+	const struct xt_log_info *loginfo = par->targinfo;
+	struct nf_loginfo li;
+
+	li.type = NF_LOG_TYPE_LOG;
+	li.u.log.level = loginfo->level;
+	li.u.log.logflags = loginfo->logflags;
+
+	if (par->family == NFPROTO_IPV4)
+		ipt_log_packet(NFPROTO_IPV4, par->hooknum, skb, par->in,
+			       par->out, &li, loginfo->prefix);
+#if IS_ENABLED(CONFIG_IPV6)
+	else if (par->family == NFPROTO_IPV6)
+		ip6t_log_packet(NFPROTO_IPV6, par->hooknum, skb, par->in,
+				par->out, &li, loginfo->prefix);
+#endif
+	else
+		WARN_ON_ONCE(1);
+
+	return XT_CONTINUE;
+}
+
+static int log_tg_check(const struct xt_tgchk_param *par)
+{
+	const struct xt_log_info *loginfo = par->targinfo;
+
+	if (par->family != NFPROTO_IPV4 && par->family != NFPROTO_IPV6)
+		return -EINVAL;
+
+	if (loginfo->level >= 8) {
+		pr_debug("level %u >= 8\n", loginfo->level);
+		return -EINVAL;
+	}
+
+	if (loginfo->prefix[sizeof(loginfo->prefix)-1] != '\0') {
+		pr_debug("prefix is not null-terminated\n");
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static struct xt_target log_tg_regs[] __read_mostly = {
+	{
+		.name		= "LOG",
+		.family		= NFPROTO_IPV4,
+		.target		= log_tg,
+		.targetsize	= sizeof(struct xt_log_info),
+		.checkentry	= log_tg_check,
+		.me		= THIS_MODULE,
+	},
+#if IS_ENABLED(CONFIG_IPV6)
+	{
+		.name		= "LOG",
+		.family		= NFPROTO_IPV6,
+		.target		= log_tg,
+		.targetsize	= sizeof(struct xt_log_info),
+		.checkentry	= log_tg_check,
+		.me		= THIS_MODULE,
+	},
+#endif
+};
+
+static struct nf_logger ipt_log_logger __read_mostly = {
+	.name		= "ipt_LOG",
+	.logfn		= &ipt_log_packet,
+	.me		= THIS_MODULE,
+};
+
+#if IS_ENABLED(CONFIG_IPV6)
+static struct nf_logger ip6t_log_logger __read_mostly = {
+	.name		= "ip6t_LOG",
+	.logfn		= &ip6t_log_packet,
+	.me		= THIS_MODULE,
+};
+#endif
+
+static int __init log_tg_init(void)
+{
+	int ret;
+
+	ret = xt_register_targets(log_tg_regs, ARRAY_SIZE(log_tg_regs));
+	if (ret < 0)
+		return ret;
+
+	nf_log_register(NFPROTO_IPV4, &ipt_log_logger);
+#if IS_ENABLED(CONFIG_IPV6)
+	nf_log_register(NFPROTO_IPV6, &ip6t_log_logger);
+#endif
+	return 0;
+}
+
+static void __exit log_tg_exit(void)
+{
+	nf_log_unregister(&ipt_log_logger);
+#if IS_ENABLED(CONFIG_IPV6)
+	nf_log_unregister(&ip6t_log_logger);
+#endif
+	xt_unregister_targets(log_tg_regs, ARRAY_SIZE(log_tg_regs));
+}
+
+module_init(log_tg_init);
+module_exit(log_tg_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Netfilter Core Team <coreteam@netfilter.org>");
+MODULE_AUTHOR("Jan Rekorajski <baggins@pld.org.pl>");
+MODULE_DESCRIPTION("Xtables: IPv4/IPv6 packet logging");
+MODULE_ALIAS("ipt_LOG");
+MODULE_ALIAS("ip6t_LOG");
-- 
1.7.7.3


^ permalink raw reply related	[flat|nested] 15+ messages in thread

end of thread, other threads:[~2012-03-05 23:21 UTC | newest]

Thread overview: 15+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2012-01-22 21:56 [PATCH v2] Merge ipt_LOG and ip6t_LOG, add ring bufffer support Richard Weinberger
2012-01-22 21:56 ` [PATCH 1/6] Netfilter: Merge ipt_LOG and ip6_LOG into xt_LOG Richard Weinberger
2012-01-30  9:01   ` richard -rw- weinberger
2012-02-01  1:24     ` Jan Engelhardt
2012-02-01  2:53       ` Pablo Neira Ayuso
2012-02-01  9:14       ` richard -rw- weinberger
2012-02-01 14:47         ` Jan Engelhardt
2012-02-01 15:08           ` richard -rw- weinberger
2012-02-01 15:19             ` Jan Engelhardt
2012-01-22 21:56 ` [PATCH 2/6] ring_buffer: Export for_each_buffer_cpu() Richard Weinberger
2012-01-22 21:56 ` [PATCH 3/6] xt_log: Make printk() in sb_close() optional Richard Weinberger
2012-01-22 21:56 ` [PATCH 4/6] Netfilter: xt_LOG: Implement ring buffer support Richard Weinberger
2012-01-22 21:56 ` [PATCH 5/6] iptables: Merge libip6t_LOG and libipt_LOG into libxt_LOG Richard Weinberger
2012-01-22 21:56 ` [PATCH 6/6] iptables: xt_LOG: Add ring buffer support Richard Weinberger
2012-03-05 23:19 [PATCH v6] Netfilter " Richard Weinberger
2012-03-05 23:19 ` [PATCH 1/6] Netfilter: Merge ipt_LOG and ip6_LOG into xt_LOG Richard Weinberger

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