From: Pablo Neira Ayuso <pablo@netfilter.org>
To: netfilter-devel@vger.kernel.org
Cc: kaber@trash.net
Subject: [PATCH 4/9] netfilter: log: split family specific code to nf_log_{ip,ip6,common}.c files
Date: Wed, 25 Jun 2014 14:32:38 +0200 [thread overview]
Message-ID: <1403699563-3604-5-git-send-email-pablo@netfilter.org> (raw)
In-Reply-To: <1403699563-3604-1-git-send-email-pablo@netfilter.org>
The plain text logging is currently embedded into the xt_LOG target.
In order to be able to use the plain text logging from nft_log, as a
first step, this patch moves the family specific code to the following
files and Kconfig symbols:
1) net/ipv4/netfilter/nf_log_ip.c: CONFIG_NF_LOG_IPV4
2) net/ipv6/netfilter/nf_log_ip6.c: CONFIG_NF_LOG_IPV6
3) net/netfilter/nf_log_common.c: CONFIG_NF_LOG_COMMON
These new modules will be required by xt_LOG and nft_log. This patch
is based on original patch from Arturo Borrero Gonzalez.
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
---
include/net/netfilter/nf_log.h | 28 ++
net/ipv4/netfilter/Kconfig | 5 +
net/ipv4/netfilter/Makefile | 3 +
net/ipv4/netfilter/nf_log_ipv4.c | 385 +++++++++++++++++
net/ipv6/netfilter/Kconfig | 5 +
net/ipv6/netfilter/Makefile | 3 +
net/ipv6/netfilter/nf_log_ipv6.c | 417 ++++++++++++++++++
net/netfilter/Kconfig | 6 +
net/netfilter/Makefile | 3 +
net/netfilter/nf_log_common.c | 187 ++++++++
net/netfilter/xt_LOG.c | 879 +-------------------------------------
11 files changed, 1047 insertions(+), 874 deletions(-)
create mode 100644 net/ipv4/netfilter/nf_log_ipv4.c
create mode 100644 net/ipv6/netfilter/nf_log_ipv6.c
create mode 100644 net/netfilter/nf_log_common.c
diff --git a/include/net/netfilter/nf_log.h b/include/net/netfilter/nf_log.h
index aaec845..bba354e 100644
--- a/include/net/netfilter/nf_log.h
+++ b/include/net/netfilter/nf_log.h
@@ -78,4 +78,32 @@ struct nf_log_buf *nf_log_buf_open(void);
__printf(2, 3) int nf_log_buf_add(struct nf_log_buf *m, const char *f, ...);
void nf_log_buf_close(struct nf_log_buf *m);
+void nf_log_ip_packet(struct net *net, 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);
+
+void nf_log_ip6_packet(struct net *net, 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);
+
+/* common logging functions */
+int nf_log_dump_udp_header(struct nf_log_buf *m, const struct sk_buff *skb,
+ u8 proto, int fragment, unsigned int offset);
+int nf_log_dump_tcp_header(struct nf_log_buf *m, const struct sk_buff *skb,
+ u8 proto, int fragment, unsigned int offset,
+ unsigned int logflags);
+void nf_log_dump_sk_uid_gid(struct nf_log_buf *m, struct sock *sk);
+void nf_log_dump_packet_common(struct nf_log_buf *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);
+
#endif /* _NF_LOG_H */
diff --git a/net/ipv4/netfilter/Kconfig b/net/ipv4/netfilter/Kconfig
index 730faac..9e71274 100644
--- a/net/ipv4/netfilter/Kconfig
+++ b/net/ipv4/netfilter/Kconfig
@@ -159,6 +159,11 @@ config IP_NF_TARGET_SYNPROXY
To compile it as a module, choose M here. If unsure, say N.
+config NF_LOG_IPV4
+ tristate "IPv4 logging"
+ default m if NETFILTER_ADVANCED=n
+ select NF_LOG_COMMON
+
# NAT + specific targets: nf_conntrack
config NF_NAT_IPV4
tristate "IPv4 NAT"
diff --git a/net/ipv4/netfilter/Makefile b/net/ipv4/netfilter/Makefile
index 90b8240..730e0c1 100644
--- a/net/ipv4/netfilter/Makefile
+++ b/net/ipv4/netfilter/Makefile
@@ -19,6 +19,9 @@ obj-$(CONFIG_NF_NAT_IPV4) += nf_nat_ipv4.o
# defrag
obj-$(CONFIG_NF_DEFRAG_IPV4) += nf_defrag_ipv4.o
+# logging
+obj-$(CONFIG_NF_LOG_IPV4) += nf_log_ipv4.o
+
# NAT helpers (nf_conntrack)
obj-$(CONFIG_NF_NAT_H323) += nf_nat_h323.o
obj-$(CONFIG_NF_NAT_PPTP) += nf_nat_pptp.o
diff --git a/net/ipv4/netfilter/nf_log_ipv4.c b/net/ipv4/netfilter/nf_log_ipv4.c
new file mode 100644
index 0000000..7e69a40
--- /dev/null
+++ b/net/ipv4/netfilter/nf_log_ipv4.c
@@ -0,0 +1,385 @@
+/* (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.
+ */
+
+#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/xt_LOG.h>
+#include <net/netfilter/nf_log.h>
+
+static struct nf_loginfo default_loginfo = {
+ .type = NF_LOG_TYPE_LOG,
+ .u = {
+ .log = {
+ .level = 5,
+ .logflags = NF_LOG_MASK,
+ },
+ },
+};
+
+/* One level of recursion won't kill us */
+static void dump_ipv4_packet(struct nf_log_buf *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) {
+ nf_log_buf_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 " */
+ nf_log_buf_add(m, "SRC=%pI4 DST=%pI4 ", &ih->saddr, &ih->daddr);
+
+ /* Max length: 46 "LEN=65535 TOS=0xFF PREC=0xFF TTL=255 ID=65535 " */
+ nf_log_buf_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)
+ nf_log_buf_add(m, "CE ");
+ if (ntohs(ih->frag_off) & IP_DF)
+ nf_log_buf_add(m, "DF ");
+ if (ntohs(ih->frag_off) & IP_MF)
+ nf_log_buf_add(m, "MF ");
+
+ /* Max length: 11 "FRAG:65535 " */
+ if (ntohs(ih->frag_off) & IP_OFFSET)
+ nf_log_buf_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) {
+ nf_log_buf_add(m, "TRUNCATED");
+ return;
+ }
+
+ /* Max length: 127 "OPT (" 15*4*2chars ") " */
+ nf_log_buf_add(m, "OPT (");
+ for (i = 0; i < optsize; i++)
+ nf_log_buf_add(m, "%02X", op[i]);
+ nf_log_buf_add(m, ") ");
+ }
+
+ switch (ih->protocol) {
+ case IPPROTO_TCP:
+ if (nf_log_dump_tcp_header(m, skb, ih->protocol,
+ ntohs(ih->frag_off) & IP_OFFSET,
+ iphoff+ih->ihl*4, logflags))
+ return;
+ break;
+ case IPPROTO_UDP:
+ case IPPROTO_UDPLITE:
+ if (nf_log_dump_udp_header(m, skb, ih->protocol,
+ ntohs(ih->frag_off) & IP_OFFSET,
+ iphoff+ih->ihl*4))
+ return;
+ 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 " */
+ nf_log_buf_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) {
+ nf_log_buf_add(m, "INCOMPLETE [%u bytes] ",
+ skb->len - iphoff - ih->ihl*4);
+ break;
+ }
+
+ /* Max length: 18 "TYPE=255 CODE=255 " */
+ nf_log_buf_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]) {
+ nf_log_buf_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 " */
+ nf_log_buf_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 " */
+ nf_log_buf_add(m, "PARAMETER=%u ",
+ ntohl(ich->un.gateway) >> 24);
+ break;
+ case ICMP_REDIRECT:
+ /* Max length: 24 "GATEWAY=255.255.255.255 " */
+ nf_log_buf_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. */
+ nf_log_buf_add(m, "[");
+ dump_ipv4_packet(m, info, skb,
+ iphoff + ih->ihl*4+sizeof(_icmph));
+ nf_log_buf_add(m, "] ");
+ }
+
+ /* Max length: 10 "MTU=65535 " */
+ if (ich->type == ICMP_DEST_UNREACH &&
+ ich->code == ICMP_FRAG_NEEDED) {
+ nf_log_buf_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 " */
+ nf_log_buf_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) {
+ nf_log_buf_add(m, "INCOMPLETE [%u bytes] ",
+ skb->len - iphoff - ih->ihl*4);
+ break;
+ }
+
+ /* Length: 15 "SPI=0xF1234567 " */
+ nf_log_buf_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 " */
+ nf_log_buf_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) {
+ nf_log_buf_add(m, "INCOMPLETE [%u bytes] ",
+ skb->len - iphoff - ih->ihl*4);
+ break;
+ }
+
+ /* Length: 15 "SPI=0xF1234567 " */
+ nf_log_buf_add(m, "SPI=0x%x ", ntohl(eh->spi));
+ break;
+ }
+ /* Max length: 10 "PROTO 255 " */
+ default:
+ nf_log_buf_add(m, "PROTO=%u ", ih->protocol);
+ }
+
+ /* Max length: 15 "UID=4294967295 " */
+ if ((logflags & XT_LOG_UID) && !iphoff)
+ nf_log_dump_sk_uid_gid(m, skb->sk);
+
+ /* Max length: 16 "MARK=0xFFFFFFFF " */
+ if (!iphoff && skb->mark)
+ nf_log_buf_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 nf_log_buf *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:
+ nf_log_buf_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:
+ nf_log_buf_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;
+
+ nf_log_buf_add(m, "%02x", *p++);
+ for (i = 1; i < dev->hard_header_len; i++, p++)
+ nf_log_buf_add(m, ":%02x", *p);
+ }
+ nf_log_buf_add(m, " ");
+}
+
+void nf_log_ip_packet(struct net *net, 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 nf_log_buf *m;
+
+ /* FIXME: Disabled from containers until syslog ns is supported */
+ if (!net_eq(net, &init_net))
+ return;
+
+ m = nf_log_buf_open();
+
+ if (!loginfo)
+ loginfo = &default_loginfo;
+
+ nf_log_dump_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);
+
+ nf_log_buf_close(m);
+}
+EXPORT_SYMBOL_GPL(nf_log_ip_packet);
+
+static struct nf_logger nf_ip_logger __read_mostly = {
+ .name = "nf_log_ipv4",
+ .type = NF_LOG_TYPE_LOG,
+ .logfn = nf_log_ip_packet,
+ .me = THIS_MODULE,
+};
+
+static int __net_init nf_log_ipv4_net_init(struct net *net)
+{
+ nf_log_set(net, NFPROTO_IPV4, &nf_ip_logger);
+ return 0;
+}
+
+static void __net_exit nf_log_ipv4_net_exit(struct net *net)
+{
+ nf_log_unset(net, &nf_ip_logger);
+}
+
+static struct pernet_operations nf_log_ipv4_net_ops = {
+ .init = nf_log_ipv4_net_init,
+ .exit = nf_log_ipv4_net_exit,
+};
+
+static int __init nf_log_ipv4_init(void)
+{
+ int ret;
+
+ ret = register_pernet_subsys(&nf_log_ipv4_net_ops);
+ if (ret < 0)
+ return ret;
+
+ nf_log_register(NFPROTO_IPV4, &nf_ip_logger);
+ return 0;
+}
+
+static void __exit nf_log_ipv4_exit(void)
+{
+ unregister_pernet_subsys(&nf_log_ipv4_net_ops);
+ nf_log_unregister(&nf_ip_logger);
+}
+
+module_init(nf_log_ipv4_init);
+module_exit(nf_log_ipv4_exit);
+
+MODULE_AUTHOR("Netfilter Core Team <coreteam@netfilter.org>");
+MODULE_DESCRIPTION("Netfilter IPv4 packet logging");
+MODULE_LICENSE("GPL");
diff --git a/net/ipv6/netfilter/Kconfig b/net/ipv6/netfilter/Kconfig
index 4bff1f2..ce898f1 100644
--- a/net/ipv6/netfilter/Kconfig
+++ b/net/ipv6/netfilter/Kconfig
@@ -227,6 +227,11 @@ config IP6_NF_SECURITY
If unsure, say N.
+config NF_LOG_IPV6
+ tristate "IPv6 logging"
+ depends on NETFILTER_ADVANCED
+ select NF_LOG_COMMON
+
config NF_NAT_IPV6
tristate "IPv6 NAT"
depends on NF_CONNTRACK_IPV6
diff --git a/net/ipv6/netfilter/Makefile b/net/ipv6/netfilter/Makefile
index 70d3dd6..c0b2631 100644
--- a/net/ipv6/netfilter/Makefile
+++ b/net/ipv6/netfilter/Makefile
@@ -23,6 +23,9 @@ obj-$(CONFIG_NF_NAT_IPV6) += nf_nat_ipv6.o
nf_defrag_ipv6-y := nf_defrag_ipv6_hooks.o nf_conntrack_reasm.o
obj-$(CONFIG_NF_DEFRAG_IPV6) += nf_defrag_ipv6.o
+# logging
+obj-$(CONFIG_NF_LOG_IPV6) += nf_log_ipv6.o
+
# nf_tables
obj-$(CONFIG_NF_TABLES_IPV6) += nf_tables_ipv6.o
obj-$(CONFIG_NFT_CHAIN_ROUTE_IPV6) += nft_chain_route_ipv6.o
diff --git a/net/ipv6/netfilter/nf_log_ipv6.c b/net/ipv6/netfilter/nf_log_ipv6.c
new file mode 100644
index 0000000..8040609
--- /dev/null
+++ b/net/ipv6/netfilter/nf_log_ipv6.c
@@ -0,0 +1,417 @@
+/* (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.
+ */
+
+#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_ipv6/ip6_tables.h>
+#include <linux/netfilter/xt_LOG.h>
+#include <net/netfilter/nf_log.h>
+
+static struct nf_loginfo default_loginfo = {
+ .type = NF_LOG_TYPE_LOG,
+ .u = {
+ .log = {
+ .level = 5,
+ .logflags = NF_LOG_MASK,
+ },
+ },
+};
+
+/* One level of recursion won't kill us */
+static void dump_ipv6_packet(struct nf_log_buf *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) {
+ nf_log_buf_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 " */
+ nf_log_buf_add(m, "SRC=%pI6 DST=%pI6 ", &ih->saddr, &ih->daddr);
+
+ /* Max length: 44 "LEN=65535 TC=255 HOPLIMIT=255 FLOWLBL=FFFFF " */
+ nf_log_buf_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) {
+ nf_log_buf_add(m, "TRUNCATED");
+ return;
+ }
+
+ /* Max length: 48 "OPT (...) " */
+ if (logflags & XT_LOG_IPOPT)
+ nf_log_buf_add(m, "OPT ( ");
+
+ switch (currenthdr) {
+ case IPPROTO_FRAGMENT: {
+ struct frag_hdr _fhdr;
+ const struct frag_hdr *fh;
+
+ nf_log_buf_add(m, "FRAG:");
+ fh = skb_header_pointer(skb, ptr, sizeof(_fhdr),
+ &_fhdr);
+ if (fh == NULL) {
+ nf_log_buf_add(m, "TRUNCATED ");
+ return;
+ }
+
+ /* Max length: 6 "65535 " */
+ nf_log_buf_add(m, "%u ", ntohs(fh->frag_off) & 0xFFF8);
+
+ /* Max length: 11 "INCOMPLETE " */
+ if (fh->frag_off & htons(0x0001))
+ nf_log_buf_add(m, "INCOMPLETE ");
+
+ nf_log_buf_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)
+ nf_log_buf_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 " */
+ nf_log_buf_add(m, "AH ");
+
+ if (fragment) {
+ nf_log_buf_add(m, ")");
+ return;
+ }
+
+ ah = skb_header_pointer(skb, ptr, sizeof(_ahdr),
+ &_ahdr);
+ if (ah == NULL) {
+ /*
+ * Max length: 26 "INCOMPLETE [65535
+ * bytes] )"
+ */
+ nf_log_buf_add(m, "INCOMPLETE [%u bytes] )",
+ skb->len - ptr);
+ return;
+ }
+
+ /* Length: 15 "SPI=0xF1234567 */
+ nf_log_buf_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 " */
+ nf_log_buf_add(m, "ESP ");
+
+ if (fragment) {
+ nf_log_buf_add(m, ")");
+ return;
+ }
+
+ /*
+ * Max length: 26 "INCOMPLETE [65535 bytes] )"
+ */
+ eh = skb_header_pointer(skb, ptr, sizeof(_esph),
+ &_esph);
+ if (eh == NULL) {
+ nf_log_buf_add(m, "INCOMPLETE [%u bytes] )",
+ skb->len - ptr);
+ return;
+ }
+
+ /* Length: 16 "SPI=0xF1234567 )" */
+ nf_log_buf_add(m, "SPI=0x%x )",
+ ntohl(eh->spi));
+ }
+ return;
+ default:
+ /* Max length: 20 "Unknown Ext Hdr 255" */
+ nf_log_buf_add(m, "Unknown Ext Hdr %u", currenthdr);
+ return;
+ }
+ if (logflags & XT_LOG_IPOPT)
+ nf_log_buf_add(m, ") ");
+
+ currenthdr = hp->nexthdr;
+ ptr += hdrlen;
+ }
+
+ switch (currenthdr) {
+ case IPPROTO_TCP:
+ if (nf_log_dump_tcp_header(m, skb, currenthdr, fragment,
+ ptr, logflags))
+ return;
+ break;
+ case IPPROTO_UDP:
+ case IPPROTO_UDPLITE:
+ if (nf_log_dump_udp_header(m, skb, currenthdr, fragment, ptr))
+ return;
+ break;
+ case IPPROTO_ICMPV6: {
+ struct icmp6hdr _icmp6h;
+ const struct icmp6hdr *ic;
+
+ /* Max length: 13 "PROTO=ICMPv6 " */
+ nf_log_buf_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) {
+ nf_log_buf_add(m, "INCOMPLETE [%u bytes] ",
+ skb->len - ptr);
+ return;
+ }
+
+ /* Max length: 18 "TYPE=255 CODE=255 " */
+ nf_log_buf_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 " */
+ nf_log_buf_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 " */
+ nf_log_buf_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) {
+ nf_log_buf_add(m, "[");
+ dump_ipv6_packet(m, info, skb,
+ ptr + sizeof(_icmp6h), 0);
+ nf_log_buf_add(m, "] ");
+ }
+
+ /* Max length: 10 "MTU=65535 " */
+ if (ic->icmp6_type == ICMPV6_PKT_TOOBIG) {
+ nf_log_buf_add(m, "MTU=%u ",
+ ntohl(ic->icmp6_mtu));
+ }
+ }
+ break;
+ }
+ /* Max length: 10 "PROTO=255 " */
+ default:
+ nf_log_buf_add(m, "PROTO=%u ", currenthdr);
+ }
+
+ /* Max length: 15 "UID=4294967295 " */
+ if ((logflags & XT_LOG_UID) && recurse)
+ nf_log_dump_sk_uid_gid(m, skb->sk);
+
+ /* Max length: 16 "MARK=0xFFFFFFFF " */
+ if (recurse && skb->mark)
+ nf_log_buf_add(m, "MARK=0x%x ", skb->mark);
+}
+
+static void dump_ipv6_mac_header(struct nf_log_buf *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:
+ nf_log_buf_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:
+ nf_log_buf_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) {
+ nf_log_buf_add(m, "%02x", *p++);
+ for (i = 1; i < len; i++)
+ nf_log_buf_add(m, ":%02x", *p++);
+ }
+ nf_log_buf_add(m, " ");
+
+ if (dev->type == ARPHRD_SIT) {
+ const struct iphdr *iph =
+ (struct iphdr *)skb_mac_header(skb);
+ nf_log_buf_add(m, "TUNNEL=%pI4->%pI4 ", &iph->saddr,
+ &iph->daddr);
+ }
+ } else {
+ nf_log_buf_add(m, " ");
+ }
+}
+
+void nf_log_ip6_packet(struct net *net, 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 nf_log_buf *m;
+
+ /* FIXME: Disabled from containers until syslog ns is supported */
+ if (!net_eq(net, &init_net))
+ return;
+
+ m = nf_log_buf_open();
+
+ if (!loginfo)
+ loginfo = &default_loginfo;
+
+ nf_log_dump_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);
+
+ nf_log_buf_close(m);
+}
+EXPORT_SYMBOL_GPL(nf_log_ip6_packet);
+
+static struct nf_logger nf_ip6_logger __read_mostly = {
+ .name = "nf_log_ipv6",
+ .type = NF_LOG_TYPE_LOG,
+ .logfn = nf_log_ip6_packet,
+ .me = THIS_MODULE,
+};
+
+static int __net_init nf_log_ipv6_net_init(struct net *net)
+{
+ nf_log_set(net, NFPROTO_IPV6, &nf_ip6_logger);
+ return 0;
+}
+
+static void __net_exit nf_log_ipv6_net_exit(struct net *net)
+{
+ nf_log_unset(net, &nf_ip6_logger);
+}
+
+static struct pernet_operations nf_log_ipv6_net_ops = {
+ .init = nf_log_ipv6_net_init,
+ .exit = nf_log_ipv6_net_exit,
+};
+
+static int __init nf_log_ipv6_init(void)
+{
+ int ret;
+
+ ret = register_pernet_subsys(&nf_log_ipv6_net_ops);
+ if (ret < 0)
+ return ret;
+
+ nf_log_register(NFPROTO_IPV6, &nf_ip6_logger);
+ return 0;
+}
+
+static void __exit nf_log_ipv6_exit(void)
+{
+ unregister_pernet_subsys(&nf_log_ipv6_net_ops);
+ nf_log_unregister(&nf_ip6_logger);
+}
+
+module_init(nf_log_ipv6_init);
+module_exit(nf_log_ipv6_exit);
+
+MODULE_AUTHOR("Netfilter Core Team <coreteam@netfilter.org>");
+MODULE_DESCRIPTION("Netfilter IPv4 packet logging");
+MODULE_LICENSE("GPL");
diff --git a/net/netfilter/Kconfig b/net/netfilter/Kconfig
index e9410d1..f17b273 100644
--- a/net/netfilter/Kconfig
+++ b/net/netfilter/Kconfig
@@ -359,6 +359,9 @@ config NETFILTER_NETLINK_QUEUE_CT
If this option is enabled, NFQUEUE can include Connection Tracking
information together with the packet is the enqueued via NFNETLINK.
+config NF_LOG_COMMON
+ tristate
+
config NF_NAT
tristate
@@ -744,6 +747,9 @@ config NETFILTER_XT_TARGET_LED
config NETFILTER_XT_TARGET_LOG
tristate "LOG target support"
+ select NF_LOG
+ select NF_LOG_IPV4
+ select NF_LOG_IPV6
default m if NETFILTER_ADVANCED=n
help
This option adds a `LOG' target, which allows you to create rules in
diff --git a/net/netfilter/Makefile b/net/netfilter/Makefile
index bffdad7..8308624 100644
--- a/net/netfilter/Makefile
+++ b/net/netfilter/Makefile
@@ -47,6 +47,9 @@ obj-$(CONFIG_NF_CONNTRACK_TFTP) += nf_conntrack_tftp.o
nf_nat-y := nf_nat_core.o nf_nat_proto_unknown.o nf_nat_proto_common.o \
nf_nat_proto_udp.o nf_nat_proto_tcp.o nf_nat_helper.o
+# generic transport layer logging
+obj-$(CONFIG_NF_LOG_COMMON) += nf_log_common.o
+
obj-$(CONFIG_NF_NAT) += nf_nat.o
# NAT protocols (nf_nat)
diff --git a/net/netfilter/nf_log_common.c b/net/netfilter/nf_log_common.c
new file mode 100644
index 0000000..eeb8ef4
--- /dev/null
+++ b/net/netfilter/nf_log_common.c
@@ -0,0 +1,187 @@
+/* (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.
+ */
+
+#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/xt_LOG.h>
+#include <net/netfilter/nf_log.h>
+
+int nf_log_dump_udp_header(struct nf_log_buf *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 " */
+ nf_log_buf_add(m, "PROTO=UDP ");
+ else /* Max length: 14 "PROTO=UDPLITE " */
+ nf_log_buf_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) {
+ nf_log_buf_add(m, "INCOMPLETE [%u bytes] ", skb->len - offset);
+
+ return 1;
+ }
+
+ /* Max length: 20 "SPT=65535 DPT=65535 " */
+ nf_log_buf_add(m, "SPT=%u DPT=%u LEN=%u ",
+ ntohs(uh->source), ntohs(uh->dest), ntohs(uh->len));
+
+out:
+ return 0;
+}
+EXPORT_SYMBOL_GPL(nf_log_dump_udp_header);
+
+int nf_log_dump_tcp_header(struct nf_log_buf *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 " */
+ nf_log_buf_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) {
+ nf_log_buf_add(m, "INCOMPLETE [%u bytes] ", skb->len - offset);
+ return 1;
+ }
+
+ /* Max length: 20 "SPT=65535 DPT=65535 " */
+ nf_log_buf_add(m, "SPT=%u DPT=%u ",
+ ntohs(th->source), ntohs(th->dest));
+ /* Max length: 30 "SEQ=4294967295 ACK=4294967295 " */
+ if (logflags & XT_LOG_TCPSEQ) {
+ nf_log_buf_add(m, "SEQ=%u ACK=%u ",
+ ntohl(th->seq), ntohl(th->ack_seq));
+ }
+
+ /* Max length: 13 "WINDOW=65535 " */
+ nf_log_buf_add(m, "WINDOW=%u ", ntohs(th->window));
+ /* Max length: 9 "RES=0x3C " */
+ nf_log_buf_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)
+ nf_log_buf_add(m, "CWR ");
+ if (th->ece)
+ nf_log_buf_add(m, "ECE ");
+ if (th->urg)
+ nf_log_buf_add(m, "URG ");
+ if (th->ack)
+ nf_log_buf_add(m, "ACK ");
+ if (th->psh)
+ nf_log_buf_add(m, "PSH ");
+ if (th->rst)
+ nf_log_buf_add(m, "RST ");
+ if (th->syn)
+ nf_log_buf_add(m, "SYN ");
+ if (th->fin)
+ nf_log_buf_add(m, "FIN ");
+ /* Max length: 11 "URGP=65535 " */
+ nf_log_buf_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) {
+ nf_log_buf_add(m, "OPT (TRUNCATED)");
+ return 1;
+ }
+
+ /* Max length: 127 "OPT (" 15*4*2chars ") " */
+ nf_log_buf_add(m, "OPT (");
+ for (i = 0; i < optsize; i++)
+ nf_log_buf_add(m, "%02X", op[i]);
+
+ nf_log_buf_add(m, ") ");
+ }
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(nf_log_dump_tcp_header);
+
+void nf_log_dump_sk_uid_gid(struct nf_log_buf *m, struct sock *sk)
+{
+ if (!sk || sk->sk_state == TCP_TIME_WAIT)
+ return;
+
+ read_lock_bh(&sk->sk_callback_lock);
+ if (sk->sk_socket && sk->sk_socket->file) {
+ const struct cred *cred = sk->sk_socket->file->f_cred;
+ nf_log_buf_add(m, "UID=%u GID=%u ",
+ from_kuid_munged(&init_user_ns, cred->fsuid),
+ from_kgid_munged(&init_user_ns, cred->fsgid));
+ }
+ read_unlock_bh(&sk->sk_callback_lock);
+}
+EXPORT_SYMBOL_GPL(nf_log_dump_sk_uid_gid);
+
+void
+nf_log_dump_packet_common(struct nf_log_buf *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)
+{
+ nf_log_buf_add(m, KERN_SOH "%c%sIN=%s OUT=%s ",
+ '0' + 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)
+ nf_log_buf_add(m, "PHYSIN=%s ", physindev->name);
+ physoutdev = skb->nf_bridge->physoutdev;
+ if (physoutdev && out != physoutdev)
+ nf_log_buf_add(m, "PHYSOUT=%s ", physoutdev->name);
+ }
+#endif
+}
+EXPORT_SYMBOL_GPL(nf_log_dump_packet_common);
+
+static int __init nf_log_common_init(void)
+{
+ return 0;
+}
+
+static void __exit nf_log_common_exit(void) {}
+
+module_init(nf_log_common_init);
+module_exit(nf_log_common_exit);
+
+MODULE_LICENSE("GPL");
diff --git a/net/netfilter/xt_LOG.c b/net/netfilter/xt_LOG.c
index 649b85f..5a6bd60 100644
--- a/net/netfilter/xt_LOG.c
+++ b/net/netfilter/xt_LOG.c
@@ -28,813 +28,6 @@
#include <linux/netfilter_ipv6/ip6_tables.h>
#include <net/netfilter/nf_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 nf_log_buf *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 " */
- nf_log_buf_add(m, "PROTO=UDP ");
- else /* Max length: 14 "PROTO=UDPLITE " */
- nf_log_buf_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) {
- nf_log_buf_add(m, "INCOMPLETE [%u bytes] ", skb->len - offset);
-
- return 1;
- }
-
- /* Max length: 20 "SPT=65535 DPT=65535 " */
- nf_log_buf_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 nf_log_buf *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 " */
- nf_log_buf_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) {
- nf_log_buf_add(m, "INCOMPLETE [%u bytes] ", skb->len - offset);
- return 1;
- }
-
- /* Max length: 20 "SPT=65535 DPT=65535 " */
- nf_log_buf_add(m, "SPT=%u DPT=%u ",
- ntohs(th->source), ntohs(th->dest));
- /* Max length: 30 "SEQ=4294967295 ACK=4294967295 " */
- if (logflags & XT_LOG_TCPSEQ) {
- nf_log_buf_add(m, "SEQ=%u ACK=%u ",
- ntohl(th->seq), ntohl(th->ack_seq));
- }
-
- /* Max length: 13 "WINDOW=65535 " */
- nf_log_buf_add(m, "WINDOW=%u ", ntohs(th->window));
- /* Max length: 9 "RES=0x3C " */
- nf_log_buf_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)
- nf_log_buf_add(m, "CWR ");
- if (th->ece)
- nf_log_buf_add(m, "ECE ");
- if (th->urg)
- nf_log_buf_add(m, "URG ");
- if (th->ack)
- nf_log_buf_add(m, "ACK ");
- if (th->psh)
- nf_log_buf_add(m, "PSH ");
- if (th->rst)
- nf_log_buf_add(m, "RST ");
- if (th->syn)
- nf_log_buf_add(m, "SYN ");
- if (th->fin)
- nf_log_buf_add(m, "FIN ");
- /* Max length: 11 "URGP=65535 " */
- nf_log_buf_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) {
- nf_log_buf_add(m, "OPT (TRUNCATED)");
- return 1;
- }
-
- /* Max length: 127 "OPT (" 15*4*2chars ") " */
- nf_log_buf_add(m, "OPT (");
- for (i = 0; i < optsize; i++)
- nf_log_buf_add(m, "%02X", op[i]);
-
- nf_log_buf_add(m, ") ");
- }
-
- return 0;
-}
-
-static void dump_sk_uid_gid(struct nf_log_buf *m, struct sock *sk)
-{
- if (!sk || sk->sk_state == TCP_TIME_WAIT)
- return;
-
- read_lock_bh(&sk->sk_callback_lock);
- if (sk->sk_socket && sk->sk_socket->file) {
- const struct cred *cred = sk->sk_socket->file->f_cred;
- nf_log_buf_add(m, "UID=%u GID=%u ",
- from_kuid_munged(&init_user_ns, cred->fsuid),
- from_kgid_munged(&init_user_ns, cred->fsgid));
- }
- read_unlock_bh(&sk->sk_callback_lock);
-}
-
-/* One level of recursion won't kill us */
-static void dump_ipv4_packet(struct nf_log_buf *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) {
- nf_log_buf_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 " */
- nf_log_buf_add(m, "SRC=%pI4 DST=%pI4 ",
- &ih->saddr, &ih->daddr);
-
- /* Max length: 46 "LEN=65535 TOS=0xFF PREC=0xFF TTL=255 ID=65535 " */
- nf_log_buf_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)
- nf_log_buf_add(m, "CE ");
- if (ntohs(ih->frag_off) & IP_DF)
- nf_log_buf_add(m, "DF ");
- if (ntohs(ih->frag_off) & IP_MF)
- nf_log_buf_add(m, "MF ");
-
- /* Max length: 11 "FRAG:65535 " */
- if (ntohs(ih->frag_off) & IP_OFFSET)
- nf_log_buf_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) {
- nf_log_buf_add(m, "TRUNCATED");
- return;
- }
-
- /* Max length: 127 "OPT (" 15*4*2chars ") " */
- nf_log_buf_add(m, "OPT (");
- for (i = 0; i < optsize; i++)
- nf_log_buf_add(m, "%02X", op[i]);
- nf_log_buf_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;
- break;
- 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;
- 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 " */
- nf_log_buf_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) {
- nf_log_buf_add(m, "INCOMPLETE [%u bytes] ",
- skb->len - iphoff - ih->ihl*4);
- break;
- }
-
- /* Max length: 18 "TYPE=255 CODE=255 " */
- nf_log_buf_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]) {
- nf_log_buf_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 " */
- nf_log_buf_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 " */
- nf_log_buf_add(m, "PARAMETER=%u ",
- ntohl(ich->un.gateway) >> 24);
- break;
- case ICMP_REDIRECT:
- /* Max length: 24 "GATEWAY=255.255.255.255 " */
- nf_log_buf_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. */
- nf_log_buf_add(m, "[");
- dump_ipv4_packet(m, info, skb,
- iphoff + ih->ihl*4+sizeof(_icmph));
- nf_log_buf_add(m, "] ");
- }
-
- /* Max length: 10 "MTU=65535 " */
- if (ich->type == ICMP_DEST_UNREACH &&
- ich->code == ICMP_FRAG_NEEDED) {
- nf_log_buf_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 " */
- nf_log_buf_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) {
- nf_log_buf_add(m, "INCOMPLETE [%u bytes] ",
- skb->len - iphoff - ih->ihl*4);
- break;
- }
-
- /* Length: 15 "SPI=0xF1234567 " */
- nf_log_buf_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 " */
- nf_log_buf_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) {
- nf_log_buf_add(m, "INCOMPLETE [%u bytes] ",
- skb->len - iphoff - ih->ihl*4);
- break;
- }
-
- /* Length: 15 "SPI=0xF1234567 " */
- nf_log_buf_add(m, "SPI=0x%x ", ntohl(eh->spi));
- break;
- }
- /* Max length: 10 "PROTO 255 " */
- default:
- nf_log_buf_add(m, "PROTO=%u ", ih->protocol);
- }
-
- /* Max length: 15 "UID=4294967295 " */
- if ((logflags & XT_LOG_UID) && !iphoff)
- dump_sk_uid_gid(m, skb->sk);
-
- /* Max length: 16 "MARK=0xFFFFFFFF " */
- if (!iphoff && skb->mark)
- nf_log_buf_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 nf_log_buf *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:
- nf_log_buf_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:
- nf_log_buf_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;
-
- nf_log_buf_add(m, "%02x", *p++);
- for (i = 1; i < dev->hard_header_len; i++, p++)
- nf_log_buf_add(m, ":%02x", *p);
- }
- nf_log_buf_add(m, " ");
-}
-
-static void
-log_packet_common(struct nf_log_buf *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)
-{
- nf_log_buf_add(m, KERN_SOH "%c%sIN=%s OUT=%s ",
- '0' + 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)
- nf_log_buf_add(m, "PHYSIN=%s ", physindev->name);
- physoutdev = skb->nf_bridge->physoutdev;
- if (physoutdev && out != physoutdev)
- nf_log_buf_add(m, "PHYSOUT=%s ", physoutdev->name);
- }
-#endif
-}
-
-
-static void
-ipt_log_packet(struct net *net,
- 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 nf_log_buf *m;
-
- /* FIXME: Disabled from containers until syslog ns is supported */
- if (!net_eq(net, &init_net))
- return;
-
- m = nf_log_buf_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);
-
- nf_log_buf_close(m);
-}
-
-#if IS_ENABLED(CONFIG_IP6_NF_IPTABLES)
-/* One level of recursion won't kill us */
-static void dump_ipv6_packet(struct nf_log_buf *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) {
- nf_log_buf_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 " */
- nf_log_buf_add(m, "SRC=%pI6 DST=%pI6 ", &ih->saddr, &ih->daddr);
-
- /* Max length: 44 "LEN=65535 TC=255 HOPLIMIT=255 FLOWLBL=FFFFF " */
- nf_log_buf_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) {
- nf_log_buf_add(m, "TRUNCATED");
- return;
- }
-
- /* Max length: 48 "OPT (...) " */
- if (logflags & XT_LOG_IPOPT)
- nf_log_buf_add(m, "OPT ( ");
-
- switch (currenthdr) {
- case IPPROTO_FRAGMENT: {
- struct frag_hdr _fhdr;
- const struct frag_hdr *fh;
-
- nf_log_buf_add(m, "FRAG:");
- fh = skb_header_pointer(skb, ptr, sizeof(_fhdr),
- &_fhdr);
- if (fh == NULL) {
- nf_log_buf_add(m, "TRUNCATED ");
- return;
- }
-
- /* Max length: 6 "65535 " */
- nf_log_buf_add(m, "%u ", ntohs(fh->frag_off) & 0xFFF8);
-
- /* Max length: 11 "INCOMPLETE " */
- if (fh->frag_off & htons(0x0001))
- nf_log_buf_add(m, "INCOMPLETE ");
-
- nf_log_buf_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)
- nf_log_buf_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 " */
- nf_log_buf_add(m, "AH ");
-
- if (fragment) {
- nf_log_buf_add(m, ")");
- return;
- }
-
- ah = skb_header_pointer(skb, ptr, sizeof(_ahdr),
- &_ahdr);
- if (ah == NULL) {
- /*
- * Max length: 26 "INCOMPLETE [65535
- * bytes] )"
- */
- nf_log_buf_add(m, "INCOMPLETE [%u bytes] )",
- skb->len - ptr);
- return;
- }
-
- /* Length: 15 "SPI=0xF1234567 */
- nf_log_buf_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 " */
- nf_log_buf_add(m, "ESP ");
-
- if (fragment) {
- nf_log_buf_add(m, ")");
- return;
- }
-
- /*
- * Max length: 26 "INCOMPLETE [65535 bytes] )"
- */
- eh = skb_header_pointer(skb, ptr, sizeof(_esph),
- &_esph);
- if (eh == NULL) {
- nf_log_buf_add(m, "INCOMPLETE [%u bytes] )",
- skb->len - ptr);
- return;
- }
-
- /* Length: 16 "SPI=0xF1234567 )" */
- nf_log_buf_add(m, "SPI=0x%x )", ntohl(eh->spi));
-
- }
- return;
- default:
- /* Max length: 20 "Unknown Ext Hdr 255" */
- nf_log_buf_add(m, "Unknown Ext Hdr %u", currenthdr);
- return;
- }
- if (logflags & XT_LOG_IPOPT)
- nf_log_buf_add(m, ") ");
-
- currenthdr = hp->nexthdr;
- ptr += hdrlen;
- }
-
- switch (currenthdr) {
- case IPPROTO_TCP:
- if (dump_tcp_header(m, skb, currenthdr, fragment, ptr,
- logflags))
- return;
- break;
- case IPPROTO_UDP:
- case IPPROTO_UDPLITE:
- if (dump_udp_header(m, skb, currenthdr, fragment, ptr))
- return;
- break;
- case IPPROTO_ICMPV6: {
- struct icmp6hdr _icmp6h;
- const struct icmp6hdr *ic;
-
- /* Max length: 13 "PROTO=ICMPv6 " */
- nf_log_buf_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) {
- nf_log_buf_add(m, "INCOMPLETE [%u bytes] ",
- skb->len - ptr);
- return;
- }
-
- /* Max length: 18 "TYPE=255 CODE=255 " */
- nf_log_buf_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 " */
- nf_log_buf_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 " */
- nf_log_buf_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) {
- nf_log_buf_add(m, "[");
- dump_ipv6_packet(m, info, skb,
- ptr + sizeof(_icmp6h), 0);
- nf_log_buf_add(m, "] ");
- }
-
- /* Max length: 10 "MTU=65535 " */
- if (ic->icmp6_type == ICMPV6_PKT_TOOBIG)
- nf_log_buf_add(m, "MTU=%u ",
- ntohl(ic->icmp6_mtu));
- }
- break;
- }
- /* Max length: 10 "PROTO=255 " */
- default:
- nf_log_buf_add(m, "PROTO=%u ", currenthdr);
- }
-
- /* Max length: 15 "UID=4294967295 " */
- if ((logflags & XT_LOG_UID) && recurse)
- dump_sk_uid_gid(m, skb->sk);
-
- /* Max length: 16 "MARK=0xFFFFFFFF " */
- if (recurse && skb->mark)
- nf_log_buf_add(m, "MARK=0x%x ", skb->mark);
-}
-
-static void dump_ipv6_mac_header(struct nf_log_buf *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:
- nf_log_buf_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:
- nf_log_buf_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) {
- nf_log_buf_add(m, "%02x", *p++);
- for (i = 1; i < len; i++)
- nf_log_buf_add(m, ":%02x", *p++);
- }
- nf_log_buf_add(m, " ");
-
- if (dev->type == ARPHRD_SIT) {
- const struct iphdr *iph =
- (struct iphdr *)skb_mac_header(skb);
- nf_log_buf_add(m, "TUNNEL=%pI4->%pI4 ",
- &iph->saddr, &iph->daddr);
- }
- } else {
- nf_log_buf_add(m, " ");
- }
-}
-
-static void
-ip6t_log_packet(struct net *net,
- 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 nf_log_buf *m;
-
- /* FIXME: Disabled from containers until syslog ns is supported */
- if (!net_eq(net, &init_net))
- return;
-
- m = nf_log_buf_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);
-
- nf_log_buf_close(m);
-}
-#endif
-
static unsigned int
log_tg(struct sk_buff *skb, const struct xt_action_param *par)
{
@@ -847,12 +40,12 @@ log_tg(struct sk_buff *skb, const struct xt_action_param *par)
li.u.log.logflags = loginfo->logflags;
if (par->family == NFPROTO_IPV4)
- ipt_log_packet(net, NFPROTO_IPV4, par->hooknum, skb, par->in,
- par->out, &li, loginfo->prefix);
+ nf_log_ip_packet(net, NFPROTO_IPV4, par->hooknum, skb, par->in,
+ par->out, &li, loginfo->prefix);
#if IS_ENABLED(CONFIG_IP6_NF_IPTABLES)
else if (par->family == NFPROTO_IPV6)
- ip6t_log_packet(net, NFPROTO_IPV6, par->hooknum, skb, par->in,
- par->out, &li, loginfo->prefix);
+ nf_log_ip6_packet(net, NFPROTO_IPV6, par->hooknum, skb, par->in,
+ par->out, &li, loginfo->prefix);
#endif
else
WARN_ON_ONCE(1);
@@ -901,75 +94,13 @@ static struct xt_target log_tg_regs[] __read_mostly = {
#endif
};
-static struct nf_logger ipt_log_logger __read_mostly = {
- .name = "ipt_LOG",
- .type = NF_LOG_TYPE_LOG,
- .logfn = &ipt_log_packet,
- .me = THIS_MODULE,
-};
-
-#if IS_ENABLED(CONFIG_IP6_NF_IPTABLES)
-static struct nf_logger ip6t_log_logger __read_mostly = {
- .name = "ip6t_LOG",
- .type = NF_LOG_TYPE_LOG,
- .logfn = &ip6t_log_packet,
- .me = THIS_MODULE,
-};
-#endif
-
-static int __net_init log_net_init(struct net *net)
-{
- nf_log_set(net, NFPROTO_IPV4, &ipt_log_logger);
-#if IS_ENABLED(CONFIG_IP6_NF_IPTABLES)
- nf_log_set(net, NFPROTO_IPV6, &ip6t_log_logger);
-#endif
- return 0;
-}
-
-static void __net_exit log_net_exit(struct net *net)
-{
- nf_log_unset(net, &ipt_log_logger);
-#if IS_ENABLED(CONFIG_IP6_NF_IPTABLES)
- nf_log_unset(net, &ip6t_log_logger);
-#endif
-}
-
-static struct pernet_operations log_net_ops = {
- .init = log_net_init,
- .exit = log_net_exit,
-};
-
static int __init log_tg_init(void)
{
- int ret;
-
- ret = register_pernet_subsys(&log_net_ops);
- if (ret < 0)
- goto err_pernet;
-
- ret = xt_register_targets(log_tg_regs, ARRAY_SIZE(log_tg_regs));
- if (ret < 0)
- goto err_target;
-
- nf_log_register(NFPROTO_IPV4, &ipt_log_logger);
-#if IS_ENABLED(CONFIG_IP6_NF_IPTABLES)
- nf_log_register(NFPROTO_IPV6, &ip6t_log_logger);
-#endif
- return 0;
-
-err_target:
- unregister_pernet_subsys(&log_net_ops);
-err_pernet:
- return ret;
+ return xt_register_targets(log_tg_regs, ARRAY_SIZE(log_tg_regs));
}
static void __exit log_tg_exit(void)
{
- unregister_pernet_subsys(&log_net_ops);
- nf_log_unregister(&ipt_log_logger);
-#if IS_ENABLED(CONFIG_IP6_NF_IPTABLES)
- nf_log_unregister(&ip6t_log_logger);
-#endif
xt_unregister_targets(log_tg_regs, ARRAY_SIZE(log_tg_regs));
}
--
1.7.10.4
next prev parent reply other threads:[~2014-06-25 12:33 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-06-25 12:32 [PATCH 0/9] Netfilter packet logging updates (v2) Pablo Neira Ayuso
2014-06-25 12:32 ` [PATCH 1/9] netfilter: kill ulog targets Pablo Neira Ayuso
2014-06-25 12:32 ` [PATCH 2/9] netfilter: nf_log: use an array of loggers instead of list Pablo Neira Ayuso
2014-06-25 12:32 ` [PATCH 3/9] netfilter: nf_log: move log buffering to core logging Pablo Neira Ayuso
2014-06-25 12:32 ` Pablo Neira Ayuso [this message]
2014-06-25 12:32 ` [PATCH 5/9] netfilter: log: nf_log_packet() as real unified interface Pablo Neira Ayuso
2014-06-25 12:32 ` [PATCH 6/9] netfilter: add generic ARP packet logger Pablo Neira Ayuso
2014-06-25 12:32 ` [PATCH 7/9] netfilter: bridge: add generic " Pablo Neira Ayuso
2014-06-25 12:32 ` [PATCH 8/9] netfilter: nft_log: request explicit logger when loading rules Pablo Neira Ayuso
2014-06-25 12:32 ` [PATCH 9/9] netfilter: nft_log: complete logging support Pablo Neira Ayuso
2014-06-26 11:37 ` Patrick McHardy
2014-06-27 11:39 ` Pablo Neira Ayuso
-- strict thread matches above, loose matches on Subject: below --
2014-06-23 14:41 [PATCH 0/9] Netfilter packet logging updates Pablo Neira Ayuso
2014-06-23 14:41 ` [PATCH 4/9] netfilter: log: split family specific code to nf_log_{ip,ip6,common}.c files Pablo Neira Ayuso
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