* [PATCH 1/9] netfilter: kill ulog targets
2014-06-25 12:32 [PATCH 0/9] Netfilter packet logging updates (v2) Pablo Neira Ayuso
@ 2014-06-25 12:32 ` 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
` (7 subsequent siblings)
8 siblings, 0 replies; 12+ messages in thread
From: Pablo Neira Ayuso @ 2014-06-25 12:32 UTC (permalink / raw)
To: netfilter-devel; +Cc: kaber
This has been marked as deprecated for quite some time and the NFLOG
target replacement has been also available since 2006.
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
---
include/uapi/linux/netfilter_bridge/Kbuild | 1 -
include/uapi/linux/netfilter_bridge/ebt_ulog.h | 38 --
include/uapi/linux/netfilter_ipv4/Kbuild | 1 -
include/uapi/linux/netfilter_ipv4/ipt_ULOG.h | 49 ---
net/bridge/netfilter/Kconfig | 16 -
net/bridge/netfilter/ebt_ulog.c | 393 -------------------
net/ipv4/netfilter/Kconfig | 19 -
net/ipv4/netfilter/ipt_ULOG.c | 498 ------------------------
8 files changed, 1015 deletions(-)
delete mode 100644 include/uapi/linux/netfilter_bridge/ebt_ulog.h
delete mode 100644 include/uapi/linux/netfilter_ipv4/ipt_ULOG.h
delete mode 100644 net/bridge/netfilter/ebt_ulog.c
delete mode 100644 net/ipv4/netfilter/ipt_ULOG.c
diff --git a/include/uapi/linux/netfilter_bridge/Kbuild b/include/uapi/linux/netfilter_bridge/Kbuild
index 348717c..0fbad8e 100644
--- a/include/uapi/linux/netfilter_bridge/Kbuild
+++ b/include/uapi/linux/netfilter_bridge/Kbuild
@@ -14,6 +14,5 @@ header-y += ebt_nflog.h
header-y += ebt_pkttype.h
header-y += ebt_redirect.h
header-y += ebt_stp.h
-header-y += ebt_ulog.h
header-y += ebt_vlan.h
header-y += ebtables.h
diff --git a/include/uapi/linux/netfilter_bridge/ebt_ulog.h b/include/uapi/linux/netfilter_bridge/ebt_ulog.h
deleted file mode 100644
index 89a6bec..0000000
--- a/include/uapi/linux/netfilter_bridge/ebt_ulog.h
+++ /dev/null
@@ -1,38 +0,0 @@
-#ifndef _EBT_ULOG_H
-#define _EBT_ULOG_H
-
-#include <linux/types.h>
-
-#define EBT_ULOG_DEFAULT_NLGROUP 0
-#define EBT_ULOG_DEFAULT_QTHRESHOLD 1
-#define EBT_ULOG_MAXNLGROUPS 32 /* hardcoded netlink max */
-#define EBT_ULOG_PREFIX_LEN 32
-#define EBT_ULOG_MAX_QLEN 50
-#define EBT_ULOG_WATCHER "ulog"
-#define EBT_ULOG_VERSION 1
-
-struct ebt_ulog_info {
- __u32 nlgroup;
- unsigned int cprange;
- unsigned int qthreshold;
- char prefix[EBT_ULOG_PREFIX_LEN];
-};
-
-typedef struct ebt_ulog_packet_msg {
- int version;
- char indev[IFNAMSIZ];
- char outdev[IFNAMSIZ];
- char physindev[IFNAMSIZ];
- char physoutdev[IFNAMSIZ];
- char prefix[EBT_ULOG_PREFIX_LEN];
- struct timeval stamp;
- unsigned long mark;
- unsigned int hook;
- size_t data_len;
- /* The complete packet, including Ethernet header and perhaps
- * the VLAN header is appended */
- unsigned char data[0] __attribute__
- ((aligned (__alignof__(struct ebt_ulog_info))));
-} ebt_ulog_packet_msg_t;
-
-#endif /* _EBT_ULOG_H */
diff --git a/include/uapi/linux/netfilter_ipv4/Kbuild b/include/uapi/linux/netfilter_ipv4/Kbuild
index fb00843..ecb291d 100644
--- a/include/uapi/linux/netfilter_ipv4/Kbuild
+++ b/include/uapi/linux/netfilter_ipv4/Kbuild
@@ -5,7 +5,6 @@ header-y += ipt_ECN.h
header-y += ipt_LOG.h
header-y += ipt_REJECT.h
header-y += ipt_TTL.h
-header-y += ipt_ULOG.h
header-y += ipt_ah.h
header-y += ipt_ecn.h
header-y += ipt_ttl.h
diff --git a/include/uapi/linux/netfilter_ipv4/ipt_ULOG.h b/include/uapi/linux/netfilter_ipv4/ipt_ULOG.h
deleted file mode 100644
index 417aad2..0000000
--- a/include/uapi/linux/netfilter_ipv4/ipt_ULOG.h
+++ /dev/null
@@ -1,49 +0,0 @@
-/* Header file for IP tables userspace logging, Version 1.8
- *
- * (C) 2000-2002 by Harald Welte <laforge@gnumonks.org>
- *
- * Distributed under the terms of GNU GPL */
-
-#ifndef _IPT_ULOG_H
-#define _IPT_ULOG_H
-
-#ifndef NETLINK_NFLOG
-#define NETLINK_NFLOG 5
-#endif
-
-#define ULOG_DEFAULT_NLGROUP 1
-#define ULOG_DEFAULT_QTHRESHOLD 1
-
-#define ULOG_MAC_LEN 80
-#define ULOG_PREFIX_LEN 32
-
-#define ULOG_MAX_QLEN 50
-/* Why 50? Well... there is a limit imposed by the slab cache 131000
- * bytes. So the multipart netlink-message has to be < 131000 bytes.
- * Assuming a standard ethernet-mtu of 1500, we could define this up
- * to 80... but even 50 seems to be big enough. */
-
-/* private data structure for each rule with a ULOG target */
-struct ipt_ulog_info {
- unsigned int nl_group;
- size_t copy_range;
- size_t qthreshold;
- char prefix[ULOG_PREFIX_LEN];
-};
-
-/* Format of the ULOG packets passed through netlink */
-typedef struct ulog_packet_msg {
- unsigned long mark;
- long timestamp_sec;
- long timestamp_usec;
- unsigned int hook;
- char indev_name[IFNAMSIZ];
- char outdev_name[IFNAMSIZ];
- size_t data_len;
- char prefix[ULOG_PREFIX_LEN];
- unsigned char mac_len;
- unsigned char mac[ULOG_MAC_LEN];
- unsigned char payload[0];
-} ulog_packet_msg_t;
-
-#endif /*_IPT_ULOG_H*/
diff --git a/net/bridge/netfilter/Kconfig b/net/bridge/netfilter/Kconfig
index 629dc77..3a76ac7 100644
--- a/net/bridge/netfilter/Kconfig
+++ b/net/bridge/netfilter/Kconfig
@@ -202,22 +202,6 @@ config BRIDGE_EBT_LOG
To compile it as a module, choose M here. If unsure, say N.
-config BRIDGE_EBT_ULOG
- tristate "ebt: ulog support (OBSOLETE)"
- help
- This option enables the old bridge-specific "ebt_ulog" implementation
- which has been obsoleted by the new "nfnetlink_log" code (see
- CONFIG_NETFILTER_NETLINK_LOG).
-
- This option adds the ulog watcher, that you can use in any rule
- in any ebtables table. The packet is passed to a userspace
- logging daemon using netlink multicast sockets. This differs
- from the log watcher in the sense that the complete packet is
- sent to userspace instead of a descriptive text and that
- netlink multicast sockets are used instead of the syslog.
-
- To compile it as a module, choose M here. If unsure, say N.
-
config BRIDGE_EBT_NFLOG
tristate "ebt: nflog support"
help
diff --git a/net/bridge/netfilter/ebt_ulog.c b/net/bridge/netfilter/ebt_ulog.c
deleted file mode 100644
index 7c470c3..0000000
--- a/net/bridge/netfilter/ebt_ulog.c
+++ /dev/null
@@ -1,393 +0,0 @@
-/*
- * netfilter module for userspace bridged Ethernet frames logging daemons
- *
- * Authors:
- * Bart De Schuymer <bdschuym@pandora.be>
- * Harald Welte <laforge@netfilter.org>
- *
- * November, 2004
- *
- * Based on ipt_ULOG.c, which is
- * (C) 2000-2002 by Harald Welte <laforge@netfilter.org>
- *
- * This module accepts two parameters:
- *
- * nlbufsiz:
- * The parameter specifies how big the buffer for each netlink multicast
- * group is. e.g. If you say nlbufsiz=8192, up to eight kb of packets will
- * get accumulated in the kernel until they are sent to userspace. It is
- * NOT possible to allocate more than 128kB, and it is strongly discouraged,
- * because atomically allocating 128kB inside the network rx softirq is not
- * reliable. Please also keep in mind that this buffer size is allocated for
- * each nlgroup you are using, so the total kernel memory usage increases
- * by that factor.
- *
- * flushtimeout:
- * Specify, after how many hundredths of a second the queue should be
- * flushed even if it is not full yet.
- *
- */
-#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
-#include <linux/module.h>
-#include <linux/slab.h>
-#include <linux/spinlock.h>
-#include <linux/socket.h>
-#include <linux/skbuff.h>
-#include <linux/kernel.h>
-#include <linux/timer.h>
-#include <net/netlink.h>
-#include <linux/netdevice.h>
-#include <linux/netfilter/x_tables.h>
-#include <linux/netfilter_bridge/ebtables.h>
-#include <linux/netfilter_bridge/ebt_ulog.h>
-#include <net/netfilter/nf_log.h>
-#include <net/netns/generic.h>
-#include <net/sock.h>
-#include "../br_private.h"
-
-static unsigned int nlbufsiz = NLMSG_GOODSIZE;
-module_param(nlbufsiz, uint, 0600);
-MODULE_PARM_DESC(nlbufsiz, "netlink buffer size (number of bytes) "
- "(defaults to 4096)");
-
-static unsigned int flushtimeout = 10;
-module_param(flushtimeout, uint, 0600);
-MODULE_PARM_DESC(flushtimeout, "buffer flush timeout (hundredths ofa second) "
- "(defaults to 10)");
-
-typedef struct {
- unsigned int qlen; /* number of nlmsgs' in the skb */
- struct nlmsghdr *lastnlh; /* netlink header of last msg in skb */
- struct sk_buff *skb; /* the pre-allocated skb */
- struct timer_list timer; /* the timer function */
- spinlock_t lock; /* the per-queue lock */
-} ebt_ulog_buff_t;
-
-static int ebt_ulog_net_id __read_mostly;
-struct ebt_ulog_net {
- unsigned int nlgroup[EBT_ULOG_MAXNLGROUPS];
- ebt_ulog_buff_t ulog_buffers[EBT_ULOG_MAXNLGROUPS];
- struct sock *ebtulognl;
-};
-
-static struct ebt_ulog_net *ebt_ulog_pernet(struct net *net)
-{
- return net_generic(net, ebt_ulog_net_id);
-}
-
-/* send one ulog_buff_t to userspace */
-static void ulog_send(struct ebt_ulog_net *ebt, unsigned int nlgroup)
-{
- ebt_ulog_buff_t *ub = &ebt->ulog_buffers[nlgroup];
-
- del_timer(&ub->timer);
-
- if (!ub->skb)
- return;
-
- /* last nlmsg needs NLMSG_DONE */
- if (ub->qlen > 1)
- ub->lastnlh->nlmsg_type = NLMSG_DONE;
-
- NETLINK_CB(ub->skb).dst_group = nlgroup + 1;
- netlink_broadcast(ebt->ebtulognl, ub->skb, 0, nlgroup + 1, GFP_ATOMIC);
-
- ub->qlen = 0;
- ub->skb = NULL;
-}
-
-/* timer function to flush queue in flushtimeout time */
-static void ulog_timer(unsigned long data)
-{
- struct ebt_ulog_net *ebt = container_of((void *)data,
- struct ebt_ulog_net,
- nlgroup[*(unsigned int *)data]);
-
- ebt_ulog_buff_t *ub = &ebt->ulog_buffers[*(unsigned int *)data];
- spin_lock_bh(&ub->lock);
- if (ub->skb)
- ulog_send(ebt, *(unsigned int *)data);
- spin_unlock_bh(&ub->lock);
-}
-
-static struct sk_buff *ulog_alloc_skb(unsigned int size)
-{
- struct sk_buff *skb;
- unsigned int n;
-
- n = max(size, nlbufsiz);
- skb = alloc_skb(n, GFP_ATOMIC | __GFP_NOWARN);
- if (!skb) {
- if (n > size) {
- /* try to allocate only as much as we need for
- * current packet */
- skb = alloc_skb(size, GFP_ATOMIC);
- if (!skb)
- pr_debug("cannot even allocate buffer of size %ub\n",
- size);
- }
- }
-
- return skb;
-}
-
-static void ebt_ulog_packet(struct net *net, unsigned int hooknr,
- const struct sk_buff *skb,
- const struct net_device *in,
- const struct net_device *out,
- const struct ebt_ulog_info *uloginfo,
- const char *prefix)
-{
- ebt_ulog_packet_msg_t *pm;
- size_t size, copy_len;
- struct nlmsghdr *nlh;
- struct ebt_ulog_net *ebt = ebt_ulog_pernet(net);
- unsigned int group = uloginfo->nlgroup;
- ebt_ulog_buff_t *ub = &ebt->ulog_buffers[group];
- spinlock_t *lock = &ub->lock;
- ktime_t kt;
-
- if ((uloginfo->cprange == 0) ||
- (uloginfo->cprange > skb->len + ETH_HLEN))
- copy_len = skb->len + ETH_HLEN;
- else
- copy_len = uloginfo->cprange;
-
- size = nlmsg_total_size(sizeof(*pm) + copy_len);
- if (size > nlbufsiz) {
- pr_debug("Size %Zd needed, but nlbufsiz=%d\n", size, nlbufsiz);
- return;
- }
-
- spin_lock_bh(lock);
-
- if (!ub->skb) {
- if (!(ub->skb = ulog_alloc_skb(size)))
- goto unlock;
- } else if (size > skb_tailroom(ub->skb)) {
- ulog_send(ebt, group);
-
- if (!(ub->skb = ulog_alloc_skb(size)))
- goto unlock;
- }
-
- nlh = nlmsg_put(ub->skb, 0, ub->qlen, 0,
- size - NLMSG_ALIGN(sizeof(*nlh)), 0);
- if (!nlh) {
- kfree_skb(ub->skb);
- ub->skb = NULL;
- goto unlock;
- }
- ub->qlen++;
-
- pm = nlmsg_data(nlh);
- memset(pm, 0, sizeof(*pm));
-
- /* Fill in the ulog data */
- pm->version = EBT_ULOG_VERSION;
- kt = ktime_get_real();
- pm->stamp = ktime_to_timeval(kt);
- if (ub->qlen == 1)
- ub->skb->tstamp = kt;
- pm->data_len = copy_len;
- pm->mark = skb->mark;
- pm->hook = hooknr;
- if (uloginfo->prefix != NULL)
- strcpy(pm->prefix, uloginfo->prefix);
-
- if (in) {
- strcpy(pm->physindev, in->name);
- /* If in isn't a bridge, then physindev==indev */
- if (br_port_exists(in))
- /* rcu_read_lock()ed by nf_hook_slow */
- strcpy(pm->indev, br_port_get_rcu(in)->br->dev->name);
- else
- strcpy(pm->indev, in->name);
- }
-
- if (out) {
- /* If out exists, then out is a bridge port */
- strcpy(pm->physoutdev, out->name);
- /* rcu_read_lock()ed by nf_hook_slow */
- strcpy(pm->outdev, br_port_get_rcu(out)->br->dev->name);
- }
-
- if (skb_copy_bits(skb, -ETH_HLEN, pm->data, copy_len) < 0)
- BUG();
-
- if (ub->qlen > 1)
- ub->lastnlh->nlmsg_flags |= NLM_F_MULTI;
-
- ub->lastnlh = nlh;
-
- if (ub->qlen >= uloginfo->qthreshold)
- ulog_send(ebt, group);
- else if (!timer_pending(&ub->timer)) {
- ub->timer.expires = jiffies + flushtimeout * HZ / 100;
- add_timer(&ub->timer);
- }
-
-unlock:
- spin_unlock_bh(lock);
-}
-
-/* this function is registered with the netfilter core */
-static void ebt_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 *li,
- const char *prefix)
-{
- struct ebt_ulog_info loginfo;
-
- if (!li || li->type != NF_LOG_TYPE_ULOG) {
- loginfo.nlgroup = EBT_ULOG_DEFAULT_NLGROUP;
- loginfo.cprange = 0;
- loginfo.qthreshold = EBT_ULOG_DEFAULT_QTHRESHOLD;
- loginfo.prefix[0] = '\0';
- } else {
- loginfo.nlgroup = li->u.ulog.group;
- loginfo.cprange = li->u.ulog.copy_len;
- loginfo.qthreshold = li->u.ulog.qthreshold;
- strlcpy(loginfo.prefix, prefix, sizeof(loginfo.prefix));
- }
-
- ebt_ulog_packet(net, hooknum, skb, in, out, &loginfo, prefix);
-}
-
-static unsigned int
-ebt_ulog_tg(struct sk_buff *skb, const struct xt_action_param *par)
-{
- struct net *net = dev_net(par->in ? par->in : par->out);
-
- ebt_ulog_packet(net, par->hooknum, skb, par->in, par->out,
- par->targinfo, NULL);
- return EBT_CONTINUE;
-}
-
-static int ebt_ulog_tg_check(const struct xt_tgchk_param *par)
-{
- struct ebt_ulog_info *uloginfo = par->targinfo;
-
- if (!par->net->xt.ebt_ulog_warn_deprecated) {
- pr_info("ebt_ulog is deprecated and it will be removed soon, "
- "use ebt_nflog instead\n");
- par->net->xt.ebt_ulog_warn_deprecated = true;
- }
-
- if (uloginfo->nlgroup > 31)
- return -EINVAL;
-
- uloginfo->prefix[EBT_ULOG_PREFIX_LEN - 1] = '\0';
-
- if (uloginfo->qthreshold > EBT_ULOG_MAX_QLEN)
- uloginfo->qthreshold = EBT_ULOG_MAX_QLEN;
-
- return 0;
-}
-
-static struct xt_target ebt_ulog_tg_reg __read_mostly = {
- .name = "ulog",
- .revision = 0,
- .family = NFPROTO_BRIDGE,
- .target = ebt_ulog_tg,
- .checkentry = ebt_ulog_tg_check,
- .targetsize = sizeof(struct ebt_ulog_info),
- .me = THIS_MODULE,
-};
-
-static struct nf_logger ebt_ulog_logger __read_mostly = {
- .name = "ebt_ulog",
- .logfn = &ebt_log_packet,
- .me = THIS_MODULE,
-};
-
-static int __net_init ebt_ulog_net_init(struct net *net)
-{
- int i;
- struct ebt_ulog_net *ebt = ebt_ulog_pernet(net);
-
- struct netlink_kernel_cfg cfg = {
- .groups = EBT_ULOG_MAXNLGROUPS,
- };
-
- /* initialize ulog_buffers */
- for (i = 0; i < EBT_ULOG_MAXNLGROUPS; i++) {
- ebt->nlgroup[i] = i;
- setup_timer(&ebt->ulog_buffers[i].timer, ulog_timer,
- (unsigned long)&ebt->nlgroup[i]);
- spin_lock_init(&ebt->ulog_buffers[i].lock);
- }
-
- ebt->ebtulognl = netlink_kernel_create(net, NETLINK_NFLOG, &cfg);
- if (!ebt->ebtulognl)
- return -ENOMEM;
-
- nf_log_set(net, NFPROTO_BRIDGE, &ebt_ulog_logger);
- return 0;
-}
-
-static void __net_exit ebt_ulog_net_fini(struct net *net)
-{
- int i;
- struct ebt_ulog_net *ebt = ebt_ulog_pernet(net);
-
- nf_log_unset(net, &ebt_ulog_logger);
- for (i = 0; i < EBT_ULOG_MAXNLGROUPS; i++) {
- ebt_ulog_buff_t *ub = &ebt->ulog_buffers[i];
- del_timer(&ub->timer);
-
- if (ub->skb) {
- kfree_skb(ub->skb);
- ub->skb = NULL;
- }
- }
- netlink_kernel_release(ebt->ebtulognl);
-}
-
-static struct pernet_operations ebt_ulog_net_ops = {
- .init = ebt_ulog_net_init,
- .exit = ebt_ulog_net_fini,
- .id = &ebt_ulog_net_id,
- .size = sizeof(struct ebt_ulog_net),
-};
-
-static int __init ebt_ulog_init(void)
-{
- int ret;
-
- if (nlbufsiz >= 128*1024) {
- pr_warn("Netlink buffer has to be <= 128kB,"
- "please try a smaller nlbufsiz parameter.\n");
- return -EINVAL;
- }
-
- ret = register_pernet_subsys(&ebt_ulog_net_ops);
- if (ret)
- goto out_pernet;
-
- ret = xt_register_target(&ebt_ulog_tg_reg);
- if (ret)
- goto out_target;
-
- nf_log_register(NFPROTO_BRIDGE, &ebt_ulog_logger);
-
- return 0;
-
-out_target:
- unregister_pernet_subsys(&ebt_ulog_net_ops);
-out_pernet:
- return ret;
-}
-
-static void __exit ebt_ulog_fini(void)
-{
- nf_log_unregister(&ebt_ulog_logger);
- xt_unregister_target(&ebt_ulog_tg_reg);
- unregister_pernet_subsys(&ebt_ulog_net_ops);
-}
-
-module_init(ebt_ulog_init);
-module_exit(ebt_ulog_fini);
-MODULE_LICENSE("GPL");
-MODULE_AUTHOR("Bart De Schuymer <bdschuym@pandora.be>");
-MODULE_DESCRIPTION("Ebtables: Packet logging to netlink using ULOG");
diff --git a/net/ipv4/netfilter/Kconfig b/net/ipv4/netfilter/Kconfig
index a26ce03..730faac 100644
--- a/net/ipv4/netfilter/Kconfig
+++ b/net/ipv4/netfilter/Kconfig
@@ -159,25 +159,6 @@ config IP_NF_TARGET_SYNPROXY
To compile it as a module, choose M here. If unsure, say N.
-config IP_NF_TARGET_ULOG
- tristate "ULOG target support (obsolete)"
- default m if NETFILTER_ADVANCED=n
- ---help---
-
- This option enables the old IPv4-only "ipt_ULOG" implementation
- which has been obsoleted by the new "nfnetlink_log" code (see
- CONFIG_NETFILTER_NETLINK_LOG).
-
- This option adds a `ULOG' target, which allows you to create rules in
- any iptables table. The packet is passed to a userspace logging
- daemon using netlink multicast sockets; unlike the LOG target
- which can only be viewed through syslog.
-
- The appropriate userspace logging daemon (ulogd) may be obtained from
- <http://www.netfilter.org/projects/ulogd/index.html>
-
- To compile it as a module, choose M here. If unsure, say N.
-
# NAT + specific targets: nf_conntrack
config NF_NAT_IPV4
tristate "IPv4 NAT"
diff --git a/net/ipv4/netfilter/ipt_ULOG.c b/net/ipv4/netfilter/ipt_ULOG.c
deleted file mode 100644
index 9cb993c..0000000
--- a/net/ipv4/netfilter/ipt_ULOG.c
+++ /dev/null
@@ -1,498 +0,0 @@
-/*
- * netfilter module for userspace packet logging daemons
- *
- * (C) 2000-2004 by Harald Welte <laforge@netfilter.org>
- * (C) 1999-2001 Paul `Rusty' Russell
- * (C) 2002-2004 Netfilter Core Team <coreteam@netfilter.org>
- * (C) 2005-2007 Patrick McHardy <kaber@trash.net>
- *
- * 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.
- *
- * This module accepts two parameters:
- *
- * nlbufsiz:
- * The parameter specifies how big the buffer for each netlink multicast
- * group is. e.g. If you say nlbufsiz=8192, up to eight kb of packets will
- * get accumulated in the kernel until they are sent to userspace. It is
- * NOT possible to allocate more than 128kB, and it is strongly discouraged,
- * because atomically allocating 128kB inside the network rx softirq is not
- * reliable. Please also keep in mind that this buffer size is allocated for
- * each nlgroup you are using, so the total kernel memory usage increases
- * by that factor.
- *
- * Actually you should use nlbufsiz a bit smaller than PAGE_SIZE, since
- * nlbufsiz is used with alloc_skb, which adds another
- * sizeof(struct skb_shared_info). Use NLMSG_GOODSIZE instead.
- *
- * flushtimeout:
- * Specify, after how many hundredths of a second the queue should be
- * flushed even if it is not full yet.
- */
-#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
-#include <linux/module.h>
-#include <linux/spinlock.h>
-#include <linux/socket.h>
-#include <linux/slab.h>
-#include <linux/skbuff.h>
-#include <linux/kernel.h>
-#include <linux/timer.h>
-#include <net/netlink.h>
-#include <linux/netdevice.h>
-#include <linux/mm.h>
-#include <linux/moduleparam.h>
-#include <linux/netfilter.h>
-#include <linux/netfilter/x_tables.h>
-#include <linux/netfilter_ipv4/ipt_ULOG.h>
-#include <net/netfilter/nf_log.h>
-#include <net/netns/generic.h>
-#include <net/sock.h>
-#include <linux/bitops.h>
-#include <asm/unaligned.h>
-
-MODULE_LICENSE("GPL");
-MODULE_AUTHOR("Harald Welte <laforge@gnumonks.org>");
-MODULE_DESCRIPTION("Xtables: packet logging to netlink using ULOG");
-MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_NFLOG);
-
-#define ULOG_NL_EVENT 111 /* Harald's favorite number */
-#define ULOG_MAXNLGROUPS 32 /* numer of nlgroups */
-
-static unsigned int nlbufsiz = NLMSG_GOODSIZE;
-module_param(nlbufsiz, uint, 0400);
-MODULE_PARM_DESC(nlbufsiz, "netlink buffer size");
-
-static unsigned int flushtimeout = 10;
-module_param(flushtimeout, uint, 0600);
-MODULE_PARM_DESC(flushtimeout, "buffer flush timeout (hundredths of a second)");
-
-static bool nflog = true;
-module_param(nflog, bool, 0400);
-MODULE_PARM_DESC(nflog, "register as internal netfilter logging module");
-
-/* global data structures */
-
-typedef struct {
- unsigned int qlen; /* number of nlmsgs' in the skb */
- struct nlmsghdr *lastnlh; /* netlink header of last msg in skb */
- struct sk_buff *skb; /* the pre-allocated skb */
- struct timer_list timer; /* the timer function */
-} ulog_buff_t;
-
-static int ulog_net_id __read_mostly;
-struct ulog_net {
- unsigned int nlgroup[ULOG_MAXNLGROUPS];
- ulog_buff_t ulog_buffers[ULOG_MAXNLGROUPS];
- struct sock *nflognl;
- spinlock_t lock;
-};
-
-static struct ulog_net *ulog_pernet(struct net *net)
-{
- return net_generic(net, ulog_net_id);
-}
-
-/* send one ulog_buff_t to userspace */
-static void ulog_send(struct ulog_net *ulog, unsigned int nlgroupnum)
-{
- ulog_buff_t *ub = &ulog->ulog_buffers[nlgroupnum];
-
- pr_debug("ulog_send: timer is deleting\n");
- del_timer(&ub->timer);
-
- if (!ub->skb) {
- pr_debug("ulog_send: nothing to send\n");
- return;
- }
-
- /* last nlmsg needs NLMSG_DONE */
- if (ub->qlen > 1)
- ub->lastnlh->nlmsg_type = NLMSG_DONE;
-
- NETLINK_CB(ub->skb).dst_group = nlgroupnum + 1;
- pr_debug("throwing %d packets to netlink group %u\n",
- ub->qlen, nlgroupnum + 1);
- netlink_broadcast(ulog->nflognl, ub->skb, 0, nlgroupnum + 1,
- GFP_ATOMIC);
-
- ub->qlen = 0;
- ub->skb = NULL;
- ub->lastnlh = NULL;
-}
-
-
-/* timer function to flush queue in flushtimeout time */
-static void ulog_timer(unsigned long data)
-{
- unsigned int groupnum = *((unsigned int *)data);
- struct ulog_net *ulog = container_of((void *)data,
- struct ulog_net,
- nlgroup[groupnum]);
- pr_debug("timer function called, calling ulog_send\n");
-
- /* lock to protect against somebody modifying our structure
- * from ipt_ulog_target at the same time */
- spin_lock_bh(&ulog->lock);
- ulog_send(ulog, groupnum);
- spin_unlock_bh(&ulog->lock);
-}
-
-static struct sk_buff *ulog_alloc_skb(unsigned int size)
-{
- struct sk_buff *skb;
- unsigned int n;
-
- /* alloc skb which should be big enough for a whole
- * multipart message. WARNING: has to be <= 131000
- * due to slab allocator restrictions */
-
- n = max(size, nlbufsiz);
- skb = alloc_skb(n, GFP_ATOMIC | __GFP_NOWARN);
- if (!skb) {
- if (n > size) {
- /* try to allocate only as much as we need for
- * current packet */
-
- skb = alloc_skb(size, GFP_ATOMIC);
- if (!skb)
- pr_debug("cannot even allocate %ub\n", size);
- }
- }
-
- return skb;
-}
-
-static void ipt_ulog_packet(struct net *net,
- unsigned int hooknum,
- const struct sk_buff *skb,
- const struct net_device *in,
- const struct net_device *out,
- const struct ipt_ulog_info *loginfo,
- const char *prefix)
-{
- ulog_buff_t *ub;
- ulog_packet_msg_t *pm;
- size_t size, copy_len;
- struct nlmsghdr *nlh;
- struct timeval tv;
- struct ulog_net *ulog = ulog_pernet(net);
-
- /* ffs == find first bit set, necessary because userspace
- * is already shifting groupnumber, but we need unshifted.
- * ffs() returns [1..32], we need [0..31] */
- unsigned int groupnum = ffs(loginfo->nl_group) - 1;
-
- /* calculate the size of the skb needed */
- if (loginfo->copy_range == 0 || loginfo->copy_range > skb->len)
- copy_len = skb->len;
- else
- copy_len = loginfo->copy_range;
-
- size = nlmsg_total_size(sizeof(*pm) + copy_len);
-
- ub = &ulog->ulog_buffers[groupnum];
-
- spin_lock_bh(&ulog->lock);
-
- if (!ub->skb) {
- if (!(ub->skb = ulog_alloc_skb(size)))
- goto alloc_failure;
- } else if (ub->qlen >= loginfo->qthreshold ||
- size > skb_tailroom(ub->skb)) {
- /* either the queue len is too high or we don't have
- * enough room in nlskb left. send it to userspace. */
-
- ulog_send(ulog, groupnum);
-
- if (!(ub->skb = ulog_alloc_skb(size)))
- goto alloc_failure;
- }
-
- pr_debug("qlen %d, qthreshold %Zu\n", ub->qlen, loginfo->qthreshold);
-
- nlh = nlmsg_put(ub->skb, 0, ub->qlen, ULOG_NL_EVENT,
- sizeof(*pm)+copy_len, 0);
- if (!nlh) {
- pr_debug("error during nlmsg_put\n");
- goto out_unlock;
- }
- ub->qlen++;
-
- pm = nlmsg_data(nlh);
- memset(pm, 0, sizeof(*pm));
-
- /* We might not have a timestamp, get one */
- if (skb->tstamp.tv64 == 0)
- __net_timestamp((struct sk_buff *)skb);
-
- /* copy hook, prefix, timestamp, payload, etc. */
- pm->data_len = copy_len;
- tv = ktime_to_timeval(skb->tstamp);
- put_unaligned(tv.tv_sec, &pm->timestamp_sec);
- put_unaligned(tv.tv_usec, &pm->timestamp_usec);
- put_unaligned(skb->mark, &pm->mark);
- pm->hook = hooknum;
- if (prefix != NULL) {
- strncpy(pm->prefix, prefix, sizeof(pm->prefix) - 1);
- pm->prefix[sizeof(pm->prefix) - 1] = '\0';
- }
- else if (loginfo->prefix[0] != '\0')
- strncpy(pm->prefix, loginfo->prefix, sizeof(pm->prefix));
-
- if (in && in->hard_header_len > 0 &&
- skb->mac_header != skb->network_header &&
- in->hard_header_len <= ULOG_MAC_LEN) {
- memcpy(pm->mac, skb_mac_header(skb), in->hard_header_len);
- pm->mac_len = in->hard_header_len;
- } else
- pm->mac_len = 0;
-
- if (in)
- strncpy(pm->indev_name, in->name, sizeof(pm->indev_name));
-
- if (out)
- strncpy(pm->outdev_name, out->name, sizeof(pm->outdev_name));
-
- /* copy_len <= skb->len, so can't fail. */
- if (skb_copy_bits(skb, 0, pm->payload, copy_len) < 0)
- BUG();
-
- /* check if we are building multi-part messages */
- if (ub->qlen > 1)
- ub->lastnlh->nlmsg_flags |= NLM_F_MULTI;
-
- ub->lastnlh = nlh;
-
- /* if timer isn't already running, start it */
- if (!timer_pending(&ub->timer)) {
- ub->timer.expires = jiffies + flushtimeout * HZ / 100;
- add_timer(&ub->timer);
- }
-
- /* if threshold is reached, send message to userspace */
- if (ub->qlen >= loginfo->qthreshold) {
- if (loginfo->qthreshold > 1)
- nlh->nlmsg_type = NLMSG_DONE;
- ulog_send(ulog, groupnum);
- }
-out_unlock:
- spin_unlock_bh(&ulog->lock);
-
- return;
-
-alloc_failure:
- pr_debug("Error building netlink message\n");
- spin_unlock_bh(&ulog->lock);
-}
-
-static unsigned int
-ulog_tg(struct sk_buff *skb, const struct xt_action_param *par)
-{
- struct net *net = dev_net(par->in ? par->in : par->out);
-
- ipt_ulog_packet(net, par->hooknum, skb, par->in, par->out,
- par->targinfo, NULL);
- return XT_CONTINUE;
-}
-
-static void ipt_logfn(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 *li,
- const char *prefix)
-{
- struct ipt_ulog_info loginfo;
-
- if (!li || li->type != NF_LOG_TYPE_ULOG) {
- loginfo.nl_group = ULOG_DEFAULT_NLGROUP;
- loginfo.copy_range = 0;
- loginfo.qthreshold = ULOG_DEFAULT_QTHRESHOLD;
- loginfo.prefix[0] = '\0';
- } else {
- loginfo.nl_group = li->u.ulog.group;
- loginfo.copy_range = li->u.ulog.copy_len;
- loginfo.qthreshold = li->u.ulog.qthreshold;
- strlcpy(loginfo.prefix, prefix, sizeof(loginfo.prefix));
- }
-
- ipt_ulog_packet(net, hooknum, skb, in, out, &loginfo, prefix);
-}
-
-static int ulog_tg_check(const struct xt_tgchk_param *par)
-{
- const struct ipt_ulog_info *loginfo = par->targinfo;
-
- if (!par->net->xt.ulog_warn_deprecated) {
- pr_info("ULOG is deprecated and it will be removed soon, "
- "use NFLOG instead\n");
- par->net->xt.ulog_warn_deprecated = true;
- }
-
- if (loginfo->prefix[sizeof(loginfo->prefix) - 1] != '\0') {
- pr_debug("prefix not null-terminated\n");
- return -EINVAL;
- }
- if (loginfo->qthreshold > ULOG_MAX_QLEN) {
- pr_debug("queue threshold %Zu > MAX_QLEN\n",
- loginfo->qthreshold);
- return -EINVAL;
- }
- return 0;
-}
-
-#ifdef CONFIG_COMPAT
-struct compat_ipt_ulog_info {
- compat_uint_t nl_group;
- compat_size_t copy_range;
- compat_size_t qthreshold;
- char prefix[ULOG_PREFIX_LEN];
-};
-
-static void ulog_tg_compat_from_user(void *dst, const void *src)
-{
- const struct compat_ipt_ulog_info *cl = src;
- struct ipt_ulog_info l = {
- .nl_group = cl->nl_group,
- .copy_range = cl->copy_range,
- .qthreshold = cl->qthreshold,
- };
-
- memcpy(l.prefix, cl->prefix, sizeof(l.prefix));
- memcpy(dst, &l, sizeof(l));
-}
-
-static int ulog_tg_compat_to_user(void __user *dst, const void *src)
-{
- const struct ipt_ulog_info *l = src;
- struct compat_ipt_ulog_info cl = {
- .nl_group = l->nl_group,
- .copy_range = l->copy_range,
- .qthreshold = l->qthreshold,
- };
-
- memcpy(cl.prefix, l->prefix, sizeof(cl.prefix));
- return copy_to_user(dst, &cl, sizeof(cl)) ? -EFAULT : 0;
-}
-#endif /* CONFIG_COMPAT */
-
-static struct xt_target ulog_tg_reg __read_mostly = {
- .name = "ULOG",
- .family = NFPROTO_IPV4,
- .target = ulog_tg,
- .targetsize = sizeof(struct ipt_ulog_info),
- .checkentry = ulog_tg_check,
-#ifdef CONFIG_COMPAT
- .compatsize = sizeof(struct compat_ipt_ulog_info),
- .compat_from_user = ulog_tg_compat_from_user,
- .compat_to_user = ulog_tg_compat_to_user,
-#endif
- .me = THIS_MODULE,
-};
-
-static struct nf_logger ipt_ulog_logger __read_mostly = {
- .name = "ipt_ULOG",
- .logfn = ipt_logfn,
- .me = THIS_MODULE,
-};
-
-static int __net_init ulog_tg_net_init(struct net *net)
-{
- int i;
- struct ulog_net *ulog = ulog_pernet(net);
- struct netlink_kernel_cfg cfg = {
- .groups = ULOG_MAXNLGROUPS,
- };
-
- spin_lock_init(&ulog->lock);
- /* initialize ulog_buffers */
- for (i = 0; i < ULOG_MAXNLGROUPS; i++) {
- ulog->nlgroup[i] = i;
- setup_timer(&ulog->ulog_buffers[i].timer, ulog_timer,
- (unsigned long)&ulog->nlgroup[i]);
- }
-
- ulog->nflognl = netlink_kernel_create(net, NETLINK_NFLOG, &cfg);
- if (!ulog->nflognl)
- return -ENOMEM;
-
- if (nflog)
- nf_log_set(net, NFPROTO_IPV4, &ipt_ulog_logger);
-
- return 0;
-}
-
-static void __net_exit ulog_tg_net_exit(struct net *net)
-{
- ulog_buff_t *ub;
- int i;
- struct ulog_net *ulog = ulog_pernet(net);
-
- if (nflog)
- nf_log_unset(net, &ipt_ulog_logger);
-
- netlink_kernel_release(ulog->nflognl);
-
- /* remove pending timers and free allocated skb's */
- for (i = 0; i < ULOG_MAXNLGROUPS; i++) {
- ub = &ulog->ulog_buffers[i];
- pr_debug("timer is deleting\n");
- del_timer(&ub->timer);
-
- if (ub->skb) {
- kfree_skb(ub->skb);
- ub->skb = NULL;
- }
- }
-}
-
-static struct pernet_operations ulog_tg_net_ops = {
- .init = ulog_tg_net_init,
- .exit = ulog_tg_net_exit,
- .id = &ulog_net_id,
- .size = sizeof(struct ulog_net),
-};
-
-static int __init ulog_tg_init(void)
-{
- int ret;
- pr_debug("init module\n");
-
- if (nlbufsiz > 128*1024) {
- pr_warn("Netlink buffer has to be <= 128kB\n");
- return -EINVAL;
- }
-
- ret = register_pernet_subsys(&ulog_tg_net_ops);
- if (ret)
- goto out_pernet;
-
- ret = xt_register_target(&ulog_tg_reg);
- if (ret < 0)
- goto out_target;
-
- if (nflog)
- nf_log_register(NFPROTO_IPV4, &ipt_ulog_logger);
-
- return 0;
-
-out_target:
- unregister_pernet_subsys(&ulog_tg_net_ops);
-out_pernet:
- return ret;
-}
-
-static void __exit ulog_tg_exit(void)
-{
- pr_debug("cleanup_module\n");
- if (nflog)
- nf_log_unregister(&ipt_ulog_logger);
- xt_unregister_target(&ulog_tg_reg);
- unregister_pernet_subsys(&ulog_tg_net_ops);
-}
-
-module_init(ulog_tg_init);
-module_exit(ulog_tg_exit);
--
1.7.10.4
^ permalink raw reply related [flat|nested] 12+ messages in thread* [PATCH 2/9] netfilter: nf_log: use an array of loggers instead of list
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 ` Pablo Neira Ayuso
2014-06-25 12:32 ` [PATCH 3/9] netfilter: nf_log: move log buffering to core logging Pablo Neira Ayuso
` (6 subsequent siblings)
8 siblings, 0 replies; 12+ messages in thread
From: Pablo Neira Ayuso @ 2014-06-25 12:32 UTC (permalink / raw)
To: netfilter-devel; +Cc: kaber
Now that legacy ulog targets are not available anymore in the tree, we
can have up to two possible loggers:
1) The plain text logging via kernel logging ring.
2) The nfnetlink_log infrastructure which delivers log messages
to userspace.
This patch replaces the list of loggers by an array of two pointers
per family for each possible logger and it also introduces a new field
to the nf_logger structure which indicates the position in the logger
array (based on the logger type).
This prepares a follow up patch that consolidates the nf_log_packet()
interface by allowing to specify the logger as parameter.
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
---
include/net/netfilter/nf_log.h | 15 ++++++++------
net/bridge/netfilter/ebt_log.c | 1 +
net/netfilter/nf_log.c | 44 ++++++++++++++++++++++------------------
net/netfilter/nfnetlink_log.c | 1 +
net/netfilter/xt_LOG.c | 2 ++
5 files changed, 37 insertions(+), 26 deletions(-)
diff --git a/include/net/netfilter/nf_log.h b/include/net/netfilter/nf_log.h
index 99eac12..06b4c6b 100644
--- a/include/net/netfilter/nf_log.h
+++ b/include/net/netfilter/nf_log.h
@@ -12,8 +12,11 @@
#define NF_LOG_UID 0x08 /* Log UID owning local socket */
#define NF_LOG_MASK 0x0f
-#define NF_LOG_TYPE_LOG 0x01
-#define NF_LOG_TYPE_ULOG 0x02
+enum nf_log_type {
+ NF_LOG_TYPE_LOG = 0,
+ NF_LOG_TYPE_ULOG,
+ NF_LOG_TYPE_MAX
+};
struct nf_loginfo {
u_int8_t type;
@@ -40,10 +43,10 @@ typedef void nf_logfn(struct net *net,
const char *prefix);
struct nf_logger {
- struct module *me;
- nf_logfn *logfn;
- char *name;
- struct list_head list[NFPROTO_NUMPROTO];
+ char *name;
+ enum nf_log_type type;
+ nf_logfn *logfn;
+ struct module *me;
};
/* Function to register/unregister log function. */
diff --git a/net/bridge/netfilter/ebt_log.c b/net/bridge/netfilter/ebt_log.c
index 5322a36..0577477 100644
--- a/net/bridge/netfilter/ebt_log.c
+++ b/net/bridge/netfilter/ebt_log.c
@@ -207,6 +207,7 @@ static struct xt_target ebt_log_tg_reg __read_mostly = {
static struct nf_logger ebt_log_logger __read_mostly = {
.name = "ebt_log",
+ .type = NF_LOG_TYPE_LOG,
.logfn = &ebt_log_packet,
.me = THIS_MODULE,
};
diff --git a/net/netfilter/nf_log.c b/net/netfilter/nf_log.c
index 85296d4..9c334db 100644
--- a/net/netfilter/nf_log.c
+++ b/net/netfilter/nf_log.c
@@ -16,16 +16,22 @@
#define NF_LOG_PREFIXLEN 128
#define NFLOGGER_NAME_LEN 64
-static struct list_head nf_loggers_l[NFPROTO_NUMPROTO] __read_mostly;
+static struct nf_logger __rcu *loggers[NFPROTO_NUMPROTO][NF_LOG_TYPE_MAX] __read_mostly;
static DEFINE_MUTEX(nf_log_mutex);
static struct nf_logger *__find_logger(int pf, const char *str_logger)
{
- struct nf_logger *t;
+ struct nf_logger *log;
+ int i;
+
+ for (i = 0; i < NF_LOG_TYPE_MAX; i++) {
+ if (loggers[pf][i] == NULL)
+ continue;
- list_for_each_entry(t, &nf_loggers_l[pf], list[pf]) {
- if (!strnicmp(str_logger, t->name, strlen(t->name)))
- return t;
+ log = rcu_dereference_protected(loggers[pf][i],
+ lockdep_is_held(&nf_log_mutex));
+ if (!strnicmp(str_logger, log->name, strlen(log->name)))
+ return log;
}
return NULL;
@@ -73,17 +79,14 @@ int nf_log_register(u_int8_t pf, struct nf_logger *logger)
if (pf >= ARRAY_SIZE(init_net.nf.nf_loggers))
return -EINVAL;
- for (i = 0; i < ARRAY_SIZE(logger->list); i++)
- INIT_LIST_HEAD(&logger->list[i]);
-
mutex_lock(&nf_log_mutex);
if (pf == NFPROTO_UNSPEC) {
for (i = NFPROTO_UNSPEC; i < NFPROTO_NUMPROTO; i++)
- list_add_tail(&(logger->list[i]), &(nf_loggers_l[i]));
+ rcu_assign_pointer(loggers[i][logger->type], logger);
} else {
/* register at end of list to honor first register win */
- list_add_tail(&logger->list[pf], &nf_loggers_l[pf]);
+ rcu_assign_pointer(loggers[pf][logger->type], logger);
}
mutex_unlock(&nf_log_mutex);
@@ -98,7 +101,7 @@ void nf_log_unregister(struct nf_logger *logger)
mutex_lock(&nf_log_mutex);
for (i = 0; i < NFPROTO_NUMPROTO; i++)
- list_del(&logger->list[i]);
+ RCU_INIT_POINTER(loggers[i][logger->type], NULL);
mutex_unlock(&nf_log_mutex);
}
EXPORT_SYMBOL(nf_log_unregister);
@@ -188,8 +191,7 @@ static int seq_show(struct seq_file *s, void *v)
{
loff_t *pos = v;
const struct nf_logger *logger;
- struct nf_logger *t;
- int ret;
+ int i, ret;
struct net *net = seq_file_net(s);
logger = rcu_dereference_protected(net->nf.nf_loggers[*pos],
@@ -203,11 +205,16 @@ static int seq_show(struct seq_file *s, void *v)
if (ret < 0)
return ret;
- list_for_each_entry(t, &nf_loggers_l[*pos], list[*pos]) {
- ret = seq_printf(s, "%s", t->name);
+ for (i = 0; i < NF_LOG_TYPE_MAX; i++) {
+ if (loggers[*pos][i] == NULL)
+ continue;
+
+ logger = rcu_dereference_protected(loggers[*pos][i],
+ lockdep_is_held(&nf_log_mutex));
+ ret = seq_printf(s, "%s", logger->name);
if (ret < 0)
return ret;
- if (&t->list[*pos] != nf_loggers_l[*pos].prev) {
+ if (i == 0 && loggers[*pos][i + 1] != NULL) {
ret = seq_printf(s, ",");
if (ret < 0)
return ret;
@@ -389,14 +396,11 @@ static struct pernet_operations nf_log_net_ops = {
int __init netfilter_log_init(void)
{
- int i, ret;
+ int ret;
ret = register_pernet_subsys(&nf_log_net_ops);
if (ret < 0)
return ret;
- for (i = NFPROTO_UNSPEC; i < NFPROTO_NUMPROTO; i++)
- INIT_LIST_HEAD(&(nf_loggers_l[i]));
-
return 0;
}
diff --git a/net/netfilter/nfnetlink_log.c b/net/netfilter/nfnetlink_log.c
index d292c8d..160bb8e 100644
--- a/net/netfilter/nfnetlink_log.c
+++ b/net/netfilter/nfnetlink_log.c
@@ -773,6 +773,7 @@ nfulnl_recv_unsupp(struct sock *ctnl, struct sk_buff *skb,
static struct nf_logger nfulnl_logger __read_mostly = {
.name = "nfnetlink_log",
+ .type = NF_LOG_TYPE_ULOG,
.logfn = &nfulnl_log_packet,
.me = THIS_MODULE,
};
diff --git a/net/netfilter/xt_LOG.c b/net/netfilter/xt_LOG.c
index 5ab2484..e668d97 100644
--- a/net/netfilter/xt_LOG.c
+++ b/net/netfilter/xt_LOG.c
@@ -896,6 +896,7 @@ static struct xt_target log_tg_regs[] __read_mostly = {
static struct nf_logger ipt_log_logger __read_mostly = {
.name = "ipt_LOG",
+ .type = NF_LOG_TYPE_LOG,
.logfn = &ipt_log_packet,
.me = THIS_MODULE,
};
@@ -903,6 +904,7 @@ static struct nf_logger ipt_log_logger __read_mostly = {
#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,
};
--
1.7.10.4
^ permalink raw reply related [flat|nested] 12+ messages in thread* [PATCH 3/9] netfilter: nf_log: move log buffering to core logging
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 ` Pablo Neira Ayuso
2014-06-25 12:32 ` [PATCH 4/9] netfilter: log: split family specific code to nf_log_{ip,ip6,common}.c files Pablo Neira Ayuso
` (5 subsequent siblings)
8 siblings, 0 replies; 12+ messages in thread
From: Pablo Neira Ayuso @ 2014-06-25 12:32 UTC (permalink / raw)
To: netfilter-devel; +Cc: kaber
This patch moves Eric Dumazet's log buffer implementation from the
xt_log.h header file to the core net/netfilter/nf_log.c. This also
includes the renaming of the structure and functions to avoid possible
undesired namespace clashes.
This change allows us to use it from the arp and bridge packet logging
implementation in follow up patches.
---
include/net/netfilter/nf_log.h | 6 +
include/net/netfilter/xt_log.h | 54 -------
net/netfilter/nf_log.c | 57 ++++++++
net/netfilter/xt_LOG.c | 301 ++++++++++++++++++++--------------------
4 files changed, 217 insertions(+), 201 deletions(-)
delete mode 100644 include/net/netfilter/xt_log.h
diff --git a/include/net/netfilter/nf_log.h b/include/net/netfilter/nf_log.h
index 06b4c6b..aaec845 100644
--- a/include/net/netfilter/nf_log.h
+++ b/include/net/netfilter/nf_log.h
@@ -72,4 +72,10 @@ void nf_log_packet(struct net *net,
const struct nf_loginfo *li,
const char *fmt, ...);
+struct nf_log_buf;
+
+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);
+
#endif /* _NF_LOG_H */
diff --git a/include/net/netfilter/xt_log.h b/include/net/netfilter/xt_log.h
deleted file mode 100644
index 9d9756c..0000000
--- a/include/net/netfilter/xt_log.h
+++ /dev/null
@@ -1,54 +0,0 @@
-#define S_SIZE (1024 - (sizeof(unsigned int) + 1))
-
-struct sbuff {
- unsigned int count;
- char buf[S_SIZE + 1];
-};
-static struct sbuff emergency, *emergency_ptr = &emergency;
-
-static __printf(2, 3) int sb_add(struct sbuff *m, const char *f, ...)
-{
- va_list args;
- int len;
-
- if (likely(m->count < S_SIZE)) {
- va_start(args, f);
- len = vsnprintf(m->buf + m->count, S_SIZE - m->count, f, args);
- va_end(args);
- if (likely(m->count + len < S_SIZE)) {
- m->count += len;
- return 0;
- }
- }
- m->count = S_SIZE;
- printk_once(KERN_ERR KBUILD_MODNAME " please increase S_SIZE\n");
- return -1;
-}
-
-static struct sbuff *sb_open(void)
-{
- struct sbuff *m = kmalloc(sizeof(*m), GFP_ATOMIC);
-
- if (unlikely(!m)) {
- local_bh_disable();
- do {
- m = xchg(&emergency_ptr, NULL);
- } while (!m);
- }
- m->count = 0;
- return m;
-}
-
-static void sb_close(struct sbuff *m)
-{
- m->buf[m->count] = 0;
- printk("%s\n", m->buf);
-
- if (likely(m != &emergency))
- kfree(m);
- else {
- emergency_ptr = m;
- local_bh_enable();
- }
-}
-
diff --git a/net/netfilter/nf_log.c b/net/netfilter/nf_log.c
index 9c334db..47143e2 100644
--- a/net/netfilter/nf_log.c
+++ b/net/netfilter/nf_log.c
@@ -157,6 +157,63 @@ void nf_log_packet(struct net *net,
}
EXPORT_SYMBOL(nf_log_packet);
+#define S_SIZE (1024 - (sizeof(unsigned int) + 1))
+
+struct nf_log_buf {
+ unsigned int count;
+ char buf[S_SIZE + 1];
+};
+static struct nf_log_buf emergency, *emergency_ptr = &emergency;
+
+__printf(2, 3) int nf_log_buf_add(struct nf_log_buf *m, const char *f, ...)
+{
+ va_list args;
+ int len;
+
+ if (likely(m->count < S_SIZE)) {
+ va_start(args, f);
+ len = vsnprintf(m->buf + m->count, S_SIZE - m->count, f, args);
+ va_end(args);
+ if (likely(m->count + len < S_SIZE)) {
+ m->count += len;
+ return 0;
+ }
+ }
+ m->count = S_SIZE;
+ printk_once(KERN_ERR KBUILD_MODNAME " please increase S_SIZE\n");
+ return -1;
+}
+EXPORT_SYMBOL_GPL(nf_log_buf_add);
+
+struct nf_log_buf *nf_log_buf_open(void)
+{
+ struct nf_log_buf *m = kmalloc(sizeof(*m), GFP_ATOMIC);
+
+ if (unlikely(!m)) {
+ local_bh_disable();
+ do {
+ m = xchg(&emergency_ptr, NULL);
+ } while (!m);
+ }
+ m->count = 0;
+ return m;
+}
+EXPORT_SYMBOL_GPL(nf_log_buf_open);
+
+void nf_log_buf_close(struct nf_log_buf *m)
+{
+ m->buf[m->count] = 0;
+ printk("%s\n", m->buf);
+
+ if (likely(m != &emergency))
+ kfree(m);
+ else {
+ emergency_ptr = m;
+ local_bh_enable();
+ }
+}
+EXPORT_SYMBOL_GPL(nf_log_buf_close);
+
#ifdef CONFIG_PROC_FS
static void *seq_start(struct seq_file *seq, loff_t *pos)
{
diff --git a/net/netfilter/xt_LOG.c b/net/netfilter/xt_LOG.c
index e668d97..649b85f 100644
--- a/net/netfilter/xt_LOG.c
+++ b/net/netfilter/xt_LOG.c
@@ -27,7 +27,6 @@
#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,
@@ -39,7 +38,7 @@ static struct nf_loginfo default_loginfo = {
},
};
-static int dump_udp_header(struct sbuff *m, const struct sk_buff *skb,
+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;
@@ -47,9 +46,9 @@ static int dump_udp_header(struct sbuff *m, const struct sk_buff *skb,
if (proto == IPPROTO_UDP)
/* Max length: 10 "PROTO=UDP " */
- sb_add(m, "PROTO=UDP ");
+ nf_log_buf_add(m, "PROTO=UDP ");
else /* Max length: 14 "PROTO=UDPLITE " */
- sb_add(m, "PROTO=UDPLITE ");
+ nf_log_buf_add(m, "PROTO=UDPLITE ");
if (fragment)
goto out;
@@ -57,20 +56,20 @@ static int dump_udp_header(struct sbuff *m, const struct sk_buff *skb,
/* 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);
+ nf_log_buf_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));
+ 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 sbuff *m, const struct sk_buff *skb,
+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)
{
@@ -78,7 +77,7 @@ static int dump_tcp_header(struct sbuff *m, const struct sk_buff *skb,
const struct tcphdr *th;
/* Max length: 10 "PROTO=TCP " */
- sb_add(m, "PROTO=TCP ");
+ nf_log_buf_add(m, "PROTO=TCP ");
if (fragment)
return 0;
@@ -86,40 +85,43 @@ static int dump_tcp_header(struct sbuff *m, const struct sk_buff *skb,
/* 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);
+ nf_log_buf_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));
+ 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)
- sb_add(m, "SEQ=%u ACK=%u ", ntohl(th->seq), ntohl(th->ack_seq));
+ 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 " */
- sb_add(m, "WINDOW=%u ", ntohs(th->window));
+ nf_log_buf_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) &
+ 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)
- sb_add(m, "CWR ");
+ nf_log_buf_add(m, "CWR ");
if (th->ece)
- sb_add(m, "ECE ");
+ nf_log_buf_add(m, "ECE ");
if (th->urg)
- sb_add(m, "URG ");
+ nf_log_buf_add(m, "URG ");
if (th->ack)
- sb_add(m, "ACK ");
+ nf_log_buf_add(m, "ACK ");
if (th->psh)
- sb_add(m, "PSH ");
+ nf_log_buf_add(m, "PSH ");
if (th->rst)
- sb_add(m, "RST ");
+ nf_log_buf_add(m, "RST ");
if (th->syn)
- sb_add(m, "SYN ");
+ nf_log_buf_add(m, "SYN ");
if (th->fin)
- sb_add(m, "FIN ");
+ nf_log_buf_add(m, "FIN ");
/* Max length: 11 "URGP=65535 " */
- sb_add(m, "URGP=%u ", ntohs(th->urg_ptr));
+ 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)];
@@ -130,22 +132,22 @@ static int dump_tcp_header(struct sbuff *m, const struct sk_buff *skb,
op = skb_header_pointer(skb, offset + sizeof(struct tcphdr),
optsize, _opt);
if (op == NULL) {
- sb_add(m, "OPT (TRUNCATED)");
+ nf_log_buf_add(m, "OPT (TRUNCATED)");
return 1;
}
/* Max length: 127 "OPT (" 15*4*2chars ") " */
- sb_add(m, "OPT (");
+ nf_log_buf_add(m, "OPT (");
for (i = 0; i < optsize; i++)
- sb_add(m, "%02X", op[i]);
+ nf_log_buf_add(m, "%02X", op[i]);
- sb_add(m, ") ");
+ nf_log_buf_add(m, ") ");
}
return 0;
}
-static void dump_sk_uid_gid(struct sbuff *m, struct sock *sk)
+static void dump_sk_uid_gid(struct nf_log_buf *m, struct sock *sk)
{
if (!sk || sk->sk_state == TCP_TIME_WAIT)
return;
@@ -153,7 +155,7 @@ static void dump_sk_uid_gid(struct sbuff *m, struct sock *sk)
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;
- sb_add(m, "UID=%u GID=%u ",
+ 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));
}
@@ -161,10 +163,9 @@ static void dump_sk_uid_gid(struct sbuff *m, struct sock *sk)
}
/* 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)
+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;
@@ -177,32 +178,32 @@ static void dump_ipv4_packet(struct sbuff *m,
ih = skb_header_pointer(skb, iphoff, sizeof(_iph), &_iph);
if (ih == NULL) {
- sb_add(m, "TRUNCATED");
+ 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 " */
- sb_add(m, "SRC=%pI4 DST=%pI4 ",
+ 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 " */
- sb_add(m, "LEN=%u TOS=0x%02X PREC=0x%02X TTL=%u ID=%u ",
+ 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)
- sb_add(m, "CE ");
+ nf_log_buf_add(m, "CE ");
if (ntohs(ih->frag_off) & IP_DF)
- sb_add(m, "DF ");
+ nf_log_buf_add(m, "DF ");
if (ntohs(ih->frag_off) & IP_MF)
- sb_add(m, "MF ");
+ nf_log_buf_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);
+ nf_log_buf_add(m, "FRAG:%u ", ntohs(ih->frag_off) & IP_OFFSET);
if ((logflags & XT_LOG_IPOPT) &&
ih->ihl * 4 > sizeof(struct iphdr)) {
@@ -214,15 +215,15 @@ static void dump_ipv4_packet(struct sbuff *m,
op = skb_header_pointer(skb, iphoff+sizeof(_iph),
optsize, _opt);
if (op == NULL) {
- sb_add(m, "TRUNCATED");
+ nf_log_buf_add(m, "TRUNCATED");
return;
}
/* Max length: 127 "OPT (" 15*4*2chars ") " */
- sb_add(m, "OPT (");
+ nf_log_buf_add(m, "OPT (");
for (i = 0; i < optsize; i++)
- sb_add(m, "%02X", op[i]);
- sb_add(m, ") ");
+ nf_log_buf_add(m, "%02X", op[i]);
+ nf_log_buf_add(m, ") ");
}
switch (ih->protocol) {
@@ -261,7 +262,7 @@ static void dump_ipv4_packet(struct sbuff *m,
[ICMP_ADDRESSREPLY] = 12 };
/* Max length: 11 "PROTO=ICMP " */
- sb_add(m, "PROTO=ICMP ");
+ nf_log_buf_add(m, "PROTO=ICMP ");
if (ntohs(ih->frag_off) & IP_OFFSET)
break;
@@ -270,19 +271,19 @@ static void dump_ipv4_packet(struct sbuff *m,
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);
+ nf_log_buf_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);
+ 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]) {
- sb_add(m, "INCOMPLETE [%u bytes] ",
+ nf_log_buf_add(m, "INCOMPLETE [%u bytes] ",
skb->len - iphoff - ih->ihl*4);
break;
}
@@ -291,35 +292,37 @@ static void dump_ipv4_packet(struct sbuff *m,
case ICMP_ECHOREPLY:
case ICMP_ECHO:
/* Max length: 19 "ID=65535 SEQ=65535 " */
- sb_add(m, "ID=%u SEQ=%u ",
+ 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 " */
- sb_add(m, "PARAMETER=%u ",
+ nf_log_buf_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);
+ 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. */
- sb_add(m, "[");
+ nf_log_buf_add(m, "[");
dump_ipv4_packet(m, info, skb,
iphoff + ih->ihl*4+sizeof(_icmph));
- sb_add(m, "] ");
+ nf_log_buf_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));
+ ich->code == ICMP_FRAG_NEEDED) {
+ nf_log_buf_add(m, "MTU=%u ",
+ ntohs(ich->un.frag.mtu));
+ }
}
break;
}
@@ -332,19 +335,19 @@ static void dump_ipv4_packet(struct sbuff *m,
break;
/* Max length: 9 "PROTO=AH " */
- sb_add(m, "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) {
- sb_add(m, "INCOMPLETE [%u bytes] ",
- skb->len - iphoff - ih->ihl*4);
+ nf_log_buf_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));
+ nf_log_buf_add(m, "SPI=0x%x ", ntohl(ah->spi));
break;
}
case IPPROTO_ESP: {
@@ -352,7 +355,7 @@ static void dump_ipv4_packet(struct sbuff *m,
const struct ip_esp_hdr *eh;
/* Max length: 10 "PROTO=ESP " */
- sb_add(m, "PROTO=ESP ");
+ nf_log_buf_add(m, "PROTO=ESP ");
if (ntohs(ih->frag_off) & IP_OFFSET)
break;
@@ -361,18 +364,18 @@ static void dump_ipv4_packet(struct sbuff *m,
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);
+ nf_log_buf_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));
+ nf_log_buf_add(m, "SPI=0x%x ", ntohl(eh->spi));
break;
}
/* Max length: 10 "PROTO 255 " */
default:
- sb_add(m, "PROTO=%u ", ih->protocol);
+ nf_log_buf_add(m, "PROTO=%u ", ih->protocol);
}
/* Max length: 15 "UID=4294967295 " */
@@ -381,7 +384,7 @@ static void dump_ipv4_packet(struct sbuff *m,
/* Max length: 16 "MARK=0xFFFFFFFF " */
if (!iphoff && skb->mark)
- sb_add(m, "MARK=0x%x ", skb->mark);
+ nf_log_buf_add(m, "MARK=0x%x ", skb->mark);
/* Proto Max log string length */
/* IP: 40+46+6+11+127 = 230 */
@@ -398,9 +401,9 @@ static void dump_ipv4_packet(struct sbuff *m,
/* 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)
+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;
@@ -413,30 +416,30 @@ static void dump_ipv4_mac_header(struct sbuff *m,
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));
+ 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:
- sb_add(m, "MAC=");
+ 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;
- sb_add(m, "%02x", *p++);
+ nf_log_buf_add(m, "%02x", *p++);
for (i = 1; i < dev->hard_header_len; i++, p++)
- sb_add(m, ":%02x", *p);
+ nf_log_buf_add(m, ":%02x", *p);
}
- sb_add(m, " ");
+ nf_log_buf_add(m, " ");
}
static void
-log_packet_common(struct sbuff *m,
+log_packet_common(struct nf_log_buf *m,
u_int8_t pf,
unsigned int hooknum,
const struct sk_buff *skb,
@@ -445,10 +448,10 @@ log_packet_common(struct sbuff *m,
const struct nf_loginfo *loginfo,
const char *prefix)
{
- sb_add(m, KERN_SOH "%c%sIN=%s OUT=%s ",
- '0' + loginfo->u.log.level, prefix,
- in ? in->name : "",
- out ? out->name : "");
+ 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;
@@ -456,10 +459,10 @@ log_packet_common(struct sbuff *m,
physindev = skb->nf_bridge->physindev;
if (physindev && in != physindev)
- sb_add(m, "PHYSIN=%s ", physindev->name);
+ nf_log_buf_add(m, "PHYSIN=%s ", physindev->name);
physoutdev = skb->nf_bridge->physoutdev;
if (physoutdev && out != physoutdev)
- sb_add(m, "PHYSOUT=%s ", physoutdev->name);
+ nf_log_buf_add(m, "PHYSOUT=%s ", physoutdev->name);
}
#endif
}
@@ -475,13 +478,13 @@ ipt_log_packet(struct net *net,
const struct nf_loginfo *loginfo,
const char *prefix)
{
- struct sbuff *m;
+ struct nf_log_buf *m;
/* FIXME: Disabled from containers until syslog ns is supported */
if (!net_eq(net, &init_net))
return;
- m = sb_open();
+ m = nf_log_buf_open();
if (!loginfo)
loginfo = &default_loginfo;
@@ -493,15 +496,15 @@ ipt_log_packet(struct net *net,
dump_ipv4_packet(m, loginfo, skb, 0);
- sb_close(m);
+ 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 sbuff *m,
- const struct nf_loginfo *info,
- const struct sk_buff *skb, unsigned int ip6hoff,
- int recurse)
+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;
@@ -518,19 +521,18 @@ static void dump_ipv6_packet(struct sbuff *m,
ih = skb_header_pointer(skb, ip6hoff, sizeof(_ip6h), &_ip6h);
if (ih == NULL) {
- sb_add(m, "TRUNCATED");
+ 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 " */
- sb_add(m, "SRC=%pI6 DST=%pI6 ", &ih->saddr, &ih->daddr);
+ nf_log_buf_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));
+ 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);
@@ -541,35 +543,35 @@ static void dump_ipv6_packet(struct sbuff *m,
hp = skb_header_pointer(skb, ptr, sizeof(_hdr), &_hdr);
if (hp == NULL) {
- sb_add(m, "TRUNCATED");
+ nf_log_buf_add(m, "TRUNCATED");
return;
}
/* Max length: 48 "OPT (...) " */
if (logflags & XT_LOG_IPOPT)
- sb_add(m, "OPT ( ");
+ nf_log_buf_add(m, "OPT ( ");
switch (currenthdr) {
case IPPROTO_FRAGMENT: {
struct frag_hdr _fhdr;
const struct frag_hdr *fh;
- sb_add(m, "FRAG:");
+ nf_log_buf_add(m, "FRAG:");
fh = skb_header_pointer(skb, ptr, sizeof(_fhdr),
&_fhdr);
if (fh == NULL) {
- sb_add(m, "TRUNCATED ");
+ nf_log_buf_add(m, "TRUNCATED ");
return;
}
/* Max length: 6 "65535 " */
- sb_add(m, "%u ", ntohs(fh->frag_off) & 0xFFF8);
+ nf_log_buf_add(m, "%u ", ntohs(fh->frag_off) & 0xFFF8);
/* Max length: 11 "INCOMPLETE " */
if (fh->frag_off & htons(0x0001))
- sb_add(m, "INCOMPLETE ");
+ nf_log_buf_add(m, "INCOMPLETE ");
- sb_add(m, "ID:%08x ", ntohl(fh->identification));
+ nf_log_buf_add(m, "ID:%08x ", ntohl(fh->identification));
if (ntohs(fh->frag_off) & 0xFFF8)
fragment = 1;
@@ -583,7 +585,7 @@ static void dump_ipv6_packet(struct sbuff *m,
case IPPROTO_HOPOPTS:
if (fragment) {
if (logflags & XT_LOG_IPOPT)
- sb_add(m, ")");
+ nf_log_buf_add(m, ")");
return;
}
hdrlen = ipv6_optlen(hp);
@@ -595,10 +597,10 @@ static void dump_ipv6_packet(struct sbuff *m,
const struct ip_auth_hdr *ah;
/* Max length: 3 "AH " */
- sb_add(m, "AH ");
+ nf_log_buf_add(m, "AH ");
if (fragment) {
- sb_add(m, ")");
+ nf_log_buf_add(m, ")");
return;
}
@@ -609,13 +611,13 @@ static void dump_ipv6_packet(struct sbuff *m,
* Max length: 26 "INCOMPLETE [65535
* bytes] )"
*/
- sb_add(m, "INCOMPLETE [%u bytes] )",
- skb->len - ptr);
+ nf_log_buf_add(m, "INCOMPLETE [%u bytes] )",
+ skb->len - ptr);
return;
}
/* Length: 15 "SPI=0xF1234567 */
- sb_add(m, "SPI=0x%x ", ntohl(ah->spi));
+ nf_log_buf_add(m, "SPI=0x%x ", ntohl(ah->spi));
}
@@ -627,10 +629,10 @@ static void dump_ipv6_packet(struct sbuff *m,
const struct ip_esp_hdr *eh;
/* Max length: 4 "ESP " */
- sb_add(m, "ESP ");
+ nf_log_buf_add(m, "ESP ");
if (fragment) {
- sb_add(m, ")");
+ nf_log_buf_add(m, ")");
return;
}
@@ -640,23 +642,23 @@ static void dump_ipv6_packet(struct sbuff *m,
eh = skb_header_pointer(skb, ptr, sizeof(_esph),
&_esph);
if (eh == NULL) {
- sb_add(m, "INCOMPLETE [%u bytes] )",
- skb->len - ptr);
+ nf_log_buf_add(m, "INCOMPLETE [%u bytes] )",
+ skb->len - ptr);
return;
}
/* Length: 16 "SPI=0xF1234567 )" */
- sb_add(m, "SPI=0x%x )", ntohl(eh->spi));
+ nf_log_buf_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);
+ nf_log_buf_add(m, "Unknown Ext Hdr %u", currenthdr);
return;
}
if (logflags & XT_LOG_IPOPT)
- sb_add(m, ") ");
+ nf_log_buf_add(m, ") ");
currenthdr = hp->nexthdr;
ptr += hdrlen;
@@ -678,7 +680,7 @@ static void dump_ipv6_packet(struct sbuff *m,
const struct icmp6hdr *ic;
/* Max length: 13 "PROTO=ICMPv6 " */
- sb_add(m, "PROTO=ICMPv6 ");
+ nf_log_buf_add(m, "PROTO=ICMPv6 ");
if (fragment)
break;
@@ -686,20 +688,22 @@ static void dump_ipv6_packet(struct sbuff *m,
/* 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);
+ nf_log_buf_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);
+ 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 " */
- sb_add(m, "ID=%u SEQ=%u ",
- ntohs(ic->icmp6_identifier),
- ntohs(ic->icmp6_sequence));
+ 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:
@@ -708,28 +712,30 @@ static void dump_ipv6_packet(struct sbuff *m,
case ICMPV6_PARAMPROB:
/* Max length: 17 "POINTER=ffffffff " */
- sb_add(m, "POINTER=%08x ", ntohl(ic->icmp6_pointer));
+ 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) {
- sb_add(m, "[");
+ nf_log_buf_add(m, "[");
dump_ipv6_packet(m, info, skb,
ptr + sizeof(_icmp6h), 0);
- sb_add(m, "] ");
+ nf_log_buf_add(m, "] ");
}
/* Max length: 10 "MTU=65535 " */
if (ic->icmp6_type == ICMPV6_PKT_TOOBIG)
- sb_add(m, "MTU=%u ", ntohl(ic->icmp6_mtu));
+ nf_log_buf_add(m, "MTU=%u ",
+ ntohl(ic->icmp6_mtu));
}
break;
}
/* Max length: 10 "PROTO=255 " */
default:
- sb_add(m, "PROTO=%u ", currenthdr);
+ nf_log_buf_add(m, "PROTO=%u ", currenthdr);
}
/* Max length: 15 "UID=4294967295 " */
@@ -738,12 +744,12 @@ static void dump_ipv6_packet(struct sbuff *m,
/* Max length: 16 "MARK=0xFFFFFFFF " */
if (recurse && skb->mark)
- sb_add(m, "MARK=0x%x ", skb->mark);
+ nf_log_buf_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)
+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;
@@ -756,16 +762,16 @@ static void dump_ipv6_mac_header(struct sbuff *m,
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));
+ 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:
- sb_add(m, "MAC=");
+ 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);
@@ -780,20 +786,21 @@ fallback:
}
if (p != NULL) {
- sb_add(m, "%02x", *p++);
+ nf_log_buf_add(m, "%02x", *p++);
for (i = 1; i < len; i++)
- sb_add(m, ":%02x", *p++);
+ nf_log_buf_add(m, ":%02x", *p++);
}
- sb_add(m, " ");
+ nf_log_buf_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);
+ nf_log_buf_add(m, "TUNNEL=%pI4->%pI4 ",
+ &iph->saddr, &iph->daddr);
}
- } else
- sb_add(m, " ");
+ } else {
+ nf_log_buf_add(m, " ");
+ }
}
static void
@@ -806,13 +813,13 @@ ip6t_log_packet(struct net *net,
const struct nf_loginfo *loginfo,
const char *prefix)
{
- struct sbuff *m;
+ struct nf_log_buf *m;
/* FIXME: Disabled from containers until syslog ns is supported */
if (!net_eq(net, &init_net))
return;
- m = sb_open();
+ m = nf_log_buf_open();
if (!loginfo)
loginfo = &default_loginfo;
@@ -824,7 +831,7 @@ ip6t_log_packet(struct net *net,
dump_ipv6_packet(m, loginfo, skb, skb_network_offset(skb), 1);
- sb_close(m);
+ nf_log_buf_close(m);
}
#endif
--
1.7.10.4
^ permalink raw reply related [flat|nested] 12+ messages in thread* [PATCH 4/9] netfilter: log: split family specific code to nf_log_{ip,ip6,common}.c files
2014-06-25 12:32 [PATCH 0/9] Netfilter packet logging updates (v2) Pablo Neira Ayuso
` (2 preceding siblings ...)
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
2014-06-25 12:32 ` [PATCH 5/9] netfilter: log: nf_log_packet() as real unified interface Pablo Neira Ayuso
` (4 subsequent siblings)
8 siblings, 0 replies; 12+ messages in thread
From: Pablo Neira Ayuso @ 2014-06-25 12:32 UTC (permalink / raw)
To: netfilter-devel; +Cc: kaber
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
^ permalink raw reply related [flat|nested] 12+ messages in thread* [PATCH 5/9] netfilter: log: nf_log_packet() as real unified interface
2014-06-25 12:32 [PATCH 0/9] Netfilter packet logging updates (v2) Pablo Neira Ayuso
` (3 preceding siblings ...)
2014-06-25 12:32 ` [PATCH 4/9] netfilter: log: split family specific code to nf_log_{ip,ip6,common}.c files Pablo Neira Ayuso
@ 2014-06-25 12:32 ` Pablo Neira Ayuso
2014-06-25 12:32 ` [PATCH 6/9] netfilter: add generic ARP packet logger Pablo Neira Ayuso
` (3 subsequent siblings)
8 siblings, 0 replies; 12+ messages in thread
From: Pablo Neira Ayuso @ 2014-06-25 12:32 UTC (permalink / raw)
To: netfilter-devel; +Cc: kaber
Before this patch, the nf_loginfo parameter specified the logging
configuration in case the specified default logger was loaded. This
patch updates the semantics of the nf_loginfo parameter in
nf_log_packet() which now indicates the logger that you explicitly
want to use.
Thus, nf_log_packet() is exposed as an unified interface which
internally routes the log message to the corresponding logger type
by family.
The module dependencies are expressed by the new nf_logger_find_get()
and nf_logger_put() functions which bump the logger module refcount.
Thus, you can not remove logger modules that are used by rules anymore.
Another important effect of this change is that the family specific
module is only loaded when required. Therefore, xt_LOG and nft_log
will just trigger the autoload of the nf_log_{ip,ip6} modules
according to the family.
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
---
include/net/netfilter/nf_log.h | 20 ++++++-------------
net/ipv4/netfilter/nf_log_ipv4.c | 14 ++++++-------
net/ipv6/netfilter/nf_log_ipv6.c | 14 ++++++-------
net/netfilter/nf_log.c | 41 +++++++++++++++++++++++++++++++++++++-
net/netfilter/nfnetlink_log.c | 3 +++
net/netfilter/xt_LOG.c | 22 ++++++++++----------
6 files changed, 73 insertions(+), 41 deletions(-)
diff --git a/include/net/netfilter/nf_log.h b/include/net/netfilter/nf_log.h
index bba354e..b82dd19 100644
--- a/include/net/netfilter/nf_log.h
+++ b/include/net/netfilter/nf_log.h
@@ -61,6 +61,12 @@ int nf_log_bind_pf(struct net *net, u_int8_t pf,
const struct nf_logger *logger);
void nf_log_unbind_pf(struct net *net, u_int8_t pf);
+int nf_logger_find_get(int pf, enum nf_log_type type);
+void nf_logger_put(int pf, enum nf_log_type type);
+
+#define MODULE_ALIAS_NF_LOGGER(family, type) \
+ MODULE_ALIAS("nf-logger-" __stringify(family) "-" __stringify(type))
+
/* Calls the registered backend logging function */
__printf(8, 9)
void nf_log_packet(struct net *net,
@@ -78,20 +84,6 @@ 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);
diff --git a/net/ipv4/netfilter/nf_log_ipv4.c b/net/ipv4/netfilter/nf_log_ipv4.c
index 7e69a40..078bdca 100644
--- a/net/ipv4/netfilter/nf_log_ipv4.c
+++ b/net/ipv4/netfilter/nf_log_ipv4.c
@@ -306,12 +306,12 @@ fallback:
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)
+static 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;
@@ -334,7 +334,6 @@ void nf_log_ip_packet(struct net *net, u_int8_t pf,
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",
@@ -383,3 +382,4 @@ module_exit(nf_log_ipv4_exit);
MODULE_AUTHOR("Netfilter Core Team <coreteam@netfilter.org>");
MODULE_DESCRIPTION("Netfilter IPv4 packet logging");
MODULE_LICENSE("GPL");
+MODULE_ALIAS_NF_LOGGER(AF_INET, 0);
diff --git a/net/ipv6/netfilter/nf_log_ipv6.c b/net/ipv6/netfilter/nf_log_ipv6.c
index 8040609..7b17a0b 100644
--- a/net/ipv6/netfilter/nf_log_ipv6.c
+++ b/net/ipv6/netfilter/nf_log_ipv6.c
@@ -338,12 +338,12 @@ fallback:
}
}
-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)
+static 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;
@@ -366,7 +366,6 @@ void nf_log_ip6_packet(struct net *net, u_int8_t pf,
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",
@@ -415,3 +414,4 @@ module_exit(nf_log_ipv6_exit);
MODULE_AUTHOR("Netfilter Core Team <coreteam@netfilter.org>");
MODULE_DESCRIPTION("Netfilter IPv4 packet logging");
MODULE_LICENSE("GPL");
+MODULE_ALIAS_NF_LOGGER(AF_INET6, 0);
diff --git a/net/netfilter/nf_log.c b/net/netfilter/nf_log.c
index 47143e2..0d37fc4 100644
--- a/net/netfilter/nf_log.c
+++ b/net/netfilter/nf_log.c
@@ -132,6 +132,41 @@ void nf_log_unbind_pf(struct net *net, u_int8_t pf)
}
EXPORT_SYMBOL(nf_log_unbind_pf);
+int nf_logger_find_get(int pf, enum nf_log_type type)
+{
+ struct nf_logger *logger;
+ int ret = -ENOENT;
+
+ logger = loggers[pf][type];
+ if (logger == NULL)
+ request_module("nf-logger-%u-%u", pf, type);
+
+ rcu_read_lock();
+ logger = rcu_dereference(loggers[pf][type]);
+ if (logger == NULL)
+ goto out;
+
+ if (logger && try_module_get(logger->me))
+ ret = 0;
+out:
+ rcu_read_unlock();
+ return ret;
+}
+EXPORT_SYMBOL_GPL(nf_logger_find_get);
+
+void nf_logger_put(int pf, enum nf_log_type type)
+{
+ struct nf_logger *logger;
+
+ BUG_ON(loggers[pf][type] == NULL);
+
+ rcu_read_lock();
+ logger = rcu_dereference(loggers[pf][type]);
+ module_put(logger->me);
+ rcu_read_unlock();
+}
+EXPORT_SYMBOL_GPL(nf_logger_put);
+
void nf_log_packet(struct net *net,
u_int8_t pf,
unsigned int hooknum,
@@ -146,7 +181,11 @@ void nf_log_packet(struct net *net,
const struct nf_logger *logger;
rcu_read_lock();
- logger = rcu_dereference(net->nf.nf_loggers[pf]);
+ if (loginfo != NULL)
+ logger = rcu_dereference(loggers[pf][loginfo->type]);
+ else
+ logger = rcu_dereference(net->nf.nf_loggers[pf]);
+
if (logger) {
va_start(args, fmt);
vsnprintf(prefix, sizeof(prefix), fmt, args);
diff --git a/net/netfilter/nfnetlink_log.c b/net/netfilter/nfnetlink_log.c
index 160bb8e..a11c5ff 100644
--- a/net/netfilter/nfnetlink_log.c
+++ b/net/netfilter/nfnetlink_log.c
@@ -1106,6 +1106,9 @@ MODULE_DESCRIPTION("netfilter userspace logging");
MODULE_AUTHOR("Harald Welte <laforge@netfilter.org>");
MODULE_LICENSE("GPL");
MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_ULOG);
+MODULE_ALIAS_NF_LOGGER(AF_INET, 1);
+MODULE_ALIAS_NF_LOGGER(AF_INET6, 1);
+MODULE_ALIAS_NF_LOGGER(AF_BRIDGE, 1);
module_init(nfnetlink_log_init);
module_exit(nfnetlink_log_fini);
diff --git a/net/netfilter/xt_LOG.c b/net/netfilter/xt_LOG.c
index 5a6bd60..00eb491 100644
--- a/net/netfilter/xt_LOG.c
+++ b/net/netfilter/xt_LOG.c
@@ -39,17 +39,8 @@ log_tg(struct sk_buff *skb, const struct xt_action_param *par)
li.u.log.level = loginfo->level;
li.u.log.logflags = loginfo->logflags;
- if (par->family == NFPROTO_IPV4)
- 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)
- nf_log_ip6_packet(net, NFPROTO_IPV6, par->hooknum, skb, par->in,
- par->out, &li, loginfo->prefix);
-#endif
- else
- WARN_ON_ONCE(1);
-
+ nf_log_packet(net, par->family, par->hooknum, skb, par->in, par->out,
+ &li, loginfo->prefix);
return XT_CONTINUE;
}
@@ -70,7 +61,12 @@ static int log_tg_check(const struct xt_tgchk_param *par)
return -EINVAL;
}
- return 0;
+ return nf_logger_find_get(par->family, NF_LOG_TYPE_LOG);
+}
+
+static void log_tg_destroy(const struct xt_tgdtor_param *par)
+{
+ nf_logger_put(par->family, NF_LOG_TYPE_LOG);
}
static struct xt_target log_tg_regs[] __read_mostly = {
@@ -80,6 +76,7 @@ static struct xt_target log_tg_regs[] __read_mostly = {
.target = log_tg,
.targetsize = sizeof(struct xt_log_info),
.checkentry = log_tg_check,
+ .destroy = log_tg_destroy,
.me = THIS_MODULE,
},
#if IS_ENABLED(CONFIG_IP6_NF_IPTABLES)
@@ -89,6 +86,7 @@ static struct xt_target log_tg_regs[] __read_mostly = {
.target = log_tg,
.targetsize = sizeof(struct xt_log_info),
.checkentry = log_tg_check,
+ .destroy = log_tg_destroy,
.me = THIS_MODULE,
},
#endif
--
1.7.10.4
^ permalink raw reply related [flat|nested] 12+ messages in thread* [PATCH 6/9] netfilter: add generic ARP packet logger
2014-06-25 12:32 [PATCH 0/9] Netfilter packet logging updates (v2) Pablo Neira Ayuso
` (4 preceding siblings ...)
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 ` Pablo Neira Ayuso
2014-06-25 12:32 ` [PATCH 7/9] netfilter: bridge: add generic " Pablo Neira Ayuso
` (2 subsequent siblings)
8 siblings, 0 replies; 12+ messages in thread
From: Pablo Neira Ayuso @ 2014-06-25 12:32 UTC (permalink / raw)
To: netfilter-devel; +Cc: kaber
This adds the generic plain text packet loggger for ARP packets. It is
based on the ebt_log code. Nevertheless, the output has been modified
to make it consistent with the original xt_LOG output.
This is an example output:
IN=wlan0 OUT= ARP HTYPE=1 PTYPE=0x0800 OPCODE=2 MACSRC=00:ab:12:34:55:63 IPSRC=192.168.10.1 MACDST=80:09:12:70:4f:50 IPDST=192.168.10.150
This patch enables packet logging from ARP chains, eg.
nft add rule arp filter input log prefix "input: "
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
---
net/ipv4/netfilter/Kconfig | 5 ++
net/ipv4/netfilter/Makefile | 1 +
net/ipv4/netfilter/nf_log_arp.c | 149 +++++++++++++++++++++++++++++++++++++++
3 files changed, 155 insertions(+)
create mode 100644 net/ipv4/netfilter/nf_log_arp.c
diff --git a/net/ipv4/netfilter/Kconfig b/net/ipv4/netfilter/Kconfig
index 9e71274..f78da40 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_ARP
+ tristate "ARP logging"
+ default m if NETFILTER_ADVANCED=n
+ select NF_LOG_INET
+
config NF_LOG_IPV4
tristate "IPv4 logging"
default m if NETFILTER_ADVANCED=n
diff --git a/net/ipv4/netfilter/Makefile b/net/ipv4/netfilter/Makefile
index 730e0c1..245db9d 100644
--- a/net/ipv4/netfilter/Makefile
+++ b/net/ipv4/netfilter/Makefile
@@ -20,6 +20,7 @@ obj-$(CONFIG_NF_NAT_IPV4) += nf_nat_ipv4.o
obj-$(CONFIG_NF_DEFRAG_IPV4) += nf_defrag_ipv4.o
# logging
+obj-$(CONFIG_NF_LOG_ARP) += nf_log_arp.o
obj-$(CONFIG_NF_LOG_IPV4) += nf_log_ipv4.o
# NAT helpers (nf_conntrack)
diff --git a/net/ipv4/netfilter/nf_log_arp.c b/net/ipv4/netfilter/nf_log_arp.c
new file mode 100644
index 0000000..ccfc78d
--- /dev/null
+++ b/net/ipv4/netfilter/nf_log_arp.c
@@ -0,0 +1,149 @@
+/*
+ * (C) 2014 by Pablo Neira Ayuso <pablo@netfilter.org>
+ *
+ * Based on code from ebt_log from:
+ *
+ * Bart De Schuymer <bdschuym@pandora.be>
+ * Harald Welte <laforge@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/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,
+ },
+ },
+};
+
+struct arppayload {
+ unsigned char mac_src[ETH_ALEN];
+ unsigned char ip_src[4];
+ unsigned char mac_dst[ETH_ALEN];
+ unsigned char ip_dst[4];
+};
+
+static void dump_arp_packet(struct nf_log_buf *m,
+ const struct nf_loginfo *info,
+ const struct sk_buff *skb, unsigned int nhoff)
+{
+ const struct arphdr *ah;
+ struct arphdr _arph;
+ const struct arppayload *ap;
+ struct arppayload _arpp;
+
+ ah = skb_header_pointer(skb, 0, sizeof(_arph), &_arph);
+ if (ah == NULL) {
+ nf_log_buf_add(m, "TRUNCATED");
+ return;
+ }
+ nf_log_buf_add(m, "ARP HTYPE=%d PTYPE=0x%04x OPCODE=%d",
+ ntohs(ah->ar_hrd), ntohs(ah->ar_pro), ntohs(ah->ar_op));
+
+ /* If it's for Ethernet and the lengths are OK, then log the ARP
+ * payload.
+ */
+ if (ah->ar_hrd != htons(1) ||
+ ah->ar_hln != ETH_ALEN ||
+ ah->ar_pln != sizeof(__be32))
+ return;
+
+ ap = skb_header_pointer(skb, sizeof(_arph), sizeof(_arpp), &_arpp);
+ if (ap == NULL) {
+ nf_log_buf_add(m, " INCOMPLETE [%Zu bytes]",
+ skb->len - sizeof(_arph));
+ return;
+ }
+ nf_log_buf_add(m, " MACSRC=%pM IPSRC=%pI4 MACDST=%pM IPDST=%pI4",
+ ap->mac_src, ap->ip_src, ap->mac_dst, ap->ip_dst);
+}
+
+void nf_log_arp_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);
+ dump_arp_packet(m, loginfo, skb, 0);
+
+ nf_log_buf_close(m);
+}
+
+static struct nf_logger nf_arp_logger __read_mostly = {
+ .name = "nf_log_arp",
+ .type = NF_LOG_TYPE_LOG,
+ .logfn = nf_log_arp_packet,
+ .me = THIS_MODULE,
+};
+
+static int __net_init nf_log_arp_net_init(struct net *net)
+{
+ nf_log_set(net, NFPROTO_ARP, &nf_arp_logger);
+ return 0;
+}
+
+static void __net_exit nf_log_arp_net_exit(struct net *net)
+{
+ nf_log_unset(net, &nf_arp_logger);
+}
+
+static struct pernet_operations nf_log_arp_net_ops = {
+ .init = nf_log_arp_net_init,
+ .exit = nf_log_arp_net_exit,
+};
+
+static int __init nf_log_arp_init(void)
+{
+ int ret;
+
+ ret = register_pernet_subsys(&nf_log_arp_net_ops);
+ if (ret < 0)
+ return ret;
+
+ nf_log_register(NFPROTO_ARP, &nf_arp_logger);
+ return 0;
+}
+
+static void __exit nf_log_arp_exit(void)
+{
+ unregister_pernet_subsys(&nf_log_arp_net_ops);
+ nf_log_unregister(&nf_arp_logger);
+}
+
+module_init(nf_log_arp_init);
+module_exit(nf_log_arp_exit);
+
+MODULE_AUTHOR("Pablo Neira Ayuso <pablo@netfilter.org>");
+MODULE_DESCRIPTION("Netfilter ARP packet logging");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS_NF_LOGGER(3, 0);
--
1.7.10.4
^ permalink raw reply related [flat|nested] 12+ messages in thread* [PATCH 7/9] netfilter: bridge: add generic packet logger
2014-06-25 12:32 [PATCH 0/9] Netfilter packet logging updates (v2) Pablo Neira Ayuso
` (5 preceding siblings ...)
2014-06-25 12:32 ` [PATCH 6/9] netfilter: add generic ARP packet logger Pablo Neira Ayuso
@ 2014-06-25 12:32 ` 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
8 siblings, 0 replies; 12+ messages in thread
From: Pablo Neira Ayuso @ 2014-06-25 12:32 UTC (permalink / raw)
To: netfilter-devel; +Cc: kaber
This adds the generic plain text packet loggger for bridged packets.
It routes the logging message to the real protocol packet logger.
I decided not to refactor the ebt_log code for two reasons:
1) The ebt_log output is not consistent with the IPv4 and IPv6
Netfilter packet loggers. The output is different for no good
reason and it adds redundant code to handle packet logging.
2) To avoid breaking backward compatibility for applications
outthere that are parsing the specific ebt_log output, the ebt_log
output has been left as is. So only nftables will use the new
consistent logging format for logged bridged packets.
More decisions coming in this patch:
1) This also removes ebt_log as default logger for bridged packets.
Thus, nf_log_packet() routes packet to this new packet logger
instead. This doesn't break backward compatibility since
nf_log_packet() is not used to log packets in plain text format
from anywhere in the ebtables/netfilter bridge code.
2) The new bridge packet logger also performs a lazy request to
register the real IPv4, ARP and IPv6 netfilter packet loggers.
If the real protocol logger is no available (not compiled or the
module is not available in the system, not packet logging happens.
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
---
include/net/netfilter/nf_log.h | 1 +
net/bridge/netfilter/Kconfig | 3 ++
net/bridge/netfilter/Makefile | 3 ++
net/bridge/netfilter/ebt_log.c | 48 ++---------------
net/bridge/netfilter/nf_log_bridge.c | 96 ++++++++++++++++++++++++++++++++++
net/netfilter/nf_log.c | 7 +++
6 files changed, 115 insertions(+), 43 deletions(-)
create mode 100644 net/bridge/netfilter/nf_log_bridge.c
diff --git a/include/net/netfilter/nf_log.h b/include/net/netfilter/nf_log.h
index b82dd19..534e1f2 100644
--- a/include/net/netfilter/nf_log.h
+++ b/include/net/netfilter/nf_log.h
@@ -63,6 +63,7 @@ void nf_log_unbind_pf(struct net *net, u_int8_t pf);
int nf_logger_find_get(int pf, enum nf_log_type type);
void nf_logger_put(int pf, enum nf_log_type type);
+void nf_logger_request_module(int pf, enum nf_log_type type);
#define MODULE_ALIAS_NF_LOGGER(family, type) \
MODULE_ALIAS("nf-logger-" __stringify(family) "-" __stringify(type))
diff --git a/net/bridge/netfilter/Kconfig b/net/bridge/netfilter/Kconfig
index 3a76ac7..4ce0b31 100644
--- a/net/bridge/netfilter/Kconfig
+++ b/net/bridge/netfilter/Kconfig
@@ -14,6 +14,9 @@ config NFT_BRIDGE_META
help
Add support for bridge dedicated meta key.
+config NF_LOG_BRIDGE
+ tristate "Bridge packet logging"
+
endif # NF_TABLES_BRIDGE
menuconfig BRIDGE_NF_EBTABLES
diff --git a/net/bridge/netfilter/Makefile b/net/bridge/netfilter/Makefile
index 6f2f394..1f78ea0 100644
--- a/net/bridge/netfilter/Makefile
+++ b/net/bridge/netfilter/Makefile
@@ -5,6 +5,9 @@
obj-$(CONFIG_NF_TABLES_BRIDGE) += nf_tables_bridge.o
obj-$(CONFIG_NFT_BRIDGE_META) += nft_meta_bridge.o
+# packet logging
+obj-$(CONFIG_NF_LOG_BRIDGE) += nf_log_bridge.o
+
obj-$(CONFIG_BRIDGE_NF_EBTABLES) += ebtables.o
# tables
diff --git a/net/bridge/netfilter/ebt_log.c b/net/bridge/netfilter/ebt_log.c
index 0577477..17f2e4b 100644
--- a/net/bridge/netfilter/ebt_log.c
+++ b/net/bridge/netfilter/ebt_log.c
@@ -186,6 +186,10 @@ ebt_log_tg(struct sk_buff *skb, const struct xt_action_param *par)
li.u.log.level = info->loglevel;
li.u.log.logflags = info->bitmask;
+ /* Remember that we have to use ebt_log_packet() not to break backward
+ * compatibility. We cannot use the default bridge packet logger via
+ * nf_log_packet() with NFT_LOG_TYPE_LOG here. --Pablo
+ */
if (info->bitmask & EBT_LOG_NFLOG)
nf_log_packet(net, NFPROTO_BRIDGE, par->hooknum, skb,
par->in, par->out, &li, "%s", info->prefix);
@@ -205,55 +209,13 @@ static struct xt_target ebt_log_tg_reg __read_mostly = {
.me = THIS_MODULE,
};
-static struct nf_logger ebt_log_logger __read_mostly = {
- .name = "ebt_log",
- .type = NF_LOG_TYPE_LOG,
- .logfn = &ebt_log_packet,
- .me = THIS_MODULE,
-};
-
-static int __net_init ebt_log_net_init(struct net *net)
-{
- nf_log_set(net, NFPROTO_BRIDGE, &ebt_log_logger);
- return 0;
-}
-
-static void __net_exit ebt_log_net_fini(struct net *net)
-{
- nf_log_unset(net, &ebt_log_logger);
-}
-
-static struct pernet_operations ebt_log_net_ops = {
- .init = ebt_log_net_init,
- .exit = ebt_log_net_fini,
-};
-
static int __init ebt_log_init(void)
{
- int ret;
-
- ret = register_pernet_subsys(&ebt_log_net_ops);
- if (ret < 0)
- goto err_pernet;
-
- ret = xt_register_target(&ebt_log_tg_reg);
- if (ret < 0)
- goto err_target;
-
- nf_log_register(NFPROTO_BRIDGE, &ebt_log_logger);
-
- return ret;
-
-err_target:
- unregister_pernet_subsys(&ebt_log_net_ops);
-err_pernet:
- return ret;
+ return xt_register_target(&ebt_log_tg_reg);
}
static void __exit ebt_log_fini(void)
{
- unregister_pernet_subsys(&ebt_log_net_ops);
- nf_log_unregister(&ebt_log_logger);
xt_unregister_target(&ebt_log_tg_reg);
}
diff --git a/net/bridge/netfilter/nf_log_bridge.c b/net/bridge/netfilter/nf_log_bridge.c
new file mode 100644
index 0000000..5d9953a
--- /dev/null
+++ b/net/bridge/netfilter/nf_log_bridge.c
@@ -0,0 +1,96 @@
+/*
+ * (C) 2014 by Pablo Neira Ayuso <pablo@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_bridge.h>
+#include <linux/ip.h>
+#include <net/route.h>
+
+#include <linux/netfilter.h>
+#include <net/netfilter/nf_log.h>
+
+static void nf_log_bridge_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)
+{
+ switch (eth_hdr(skb)->h_proto) {
+ case htons(ETH_P_IP):
+ nf_log_packet(net, NFPROTO_IPV4, hooknum, skb, in, out,
+ loginfo, "%s", prefix);
+ break;
+ case htons(ETH_P_IPV6):
+ nf_log_packet(net, NFPROTO_IPV6, hooknum, skb, in, out,
+ loginfo, "%s", prefix);
+ break;
+ case htons(ETH_P_ARP):
+ case htons(ETH_P_RARP):
+ nf_log_packet(net, NFPROTO_ARP, hooknum, skb, in, out,
+ loginfo, "%s", prefix);
+ break;
+ }
+}
+
+static struct nf_logger nf_bridge_logger __read_mostly = {
+ .name = "nf_log_bridge",
+ .type = NF_LOG_TYPE_LOG,
+ .logfn = nf_log_bridge_packet,
+ .me = THIS_MODULE,
+};
+
+static int __net_init nf_log_bridge_net_init(struct net *net)
+{
+ nf_log_set(net, NFPROTO_BRIDGE, &nf_bridge_logger);
+ return 0;
+}
+
+static void __net_exit nf_log_bridge_net_exit(struct net *net)
+{
+ nf_log_unset(net, &nf_bridge_logger);
+}
+
+static struct pernet_operations nf_log_bridge_net_ops = {
+ .init = nf_log_bridge_net_init,
+ .exit = nf_log_bridge_net_exit,
+};
+
+static int __init nf_log_bridge_init(void)
+{
+ int ret;
+
+ /* Request to load the real packet loggers. */
+ nf_logger_request_module(NFPROTO_IPV4, NF_LOG_TYPE_LOG);
+ nf_logger_request_module(NFPROTO_IPV6, NF_LOG_TYPE_LOG);
+ nf_logger_request_module(NFPROTO_ARP, NF_LOG_TYPE_LOG);
+
+ ret = register_pernet_subsys(&nf_log_bridge_net_ops);
+ if (ret < 0)
+ return ret;
+
+ nf_log_register(NFPROTO_BRIDGE, &nf_bridge_logger);
+ return 0;
+}
+
+static void __exit nf_log_bridge_exit(void)
+{
+ unregister_pernet_subsys(&nf_log_bridge_net_ops);
+ nf_log_unregister(&nf_bridge_logger);
+}
+
+module_init(nf_log_bridge_init);
+module_exit(nf_log_bridge_exit);
+
+MODULE_AUTHOR("Pablo Neira Ayuso <pablo@netfilter.org>");
+MODULE_DESCRIPTION("Netfilter bridge packet logging");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS_NF_LOGGER(AF_BRIDGE, 0);
diff --git a/net/netfilter/nf_log.c b/net/netfilter/nf_log.c
index 0d37fc4..b047027 100644
--- a/net/netfilter/nf_log.c
+++ b/net/netfilter/nf_log.c
@@ -132,6 +132,13 @@ void nf_log_unbind_pf(struct net *net, u_int8_t pf)
}
EXPORT_SYMBOL(nf_log_unbind_pf);
+void nf_logger_request_module(int pf, enum nf_log_type type)
+{
+ if (loggers[pf][type] == NULL)
+ request_module("nf-logger-%u-%u", pf, type);
+}
+EXPORT_SYMBOL_GPL(nf_logger_request_module);
+
int nf_logger_find_get(int pf, enum nf_log_type type)
{
struct nf_logger *logger;
--
1.7.10.4
^ permalink raw reply related [flat|nested] 12+ messages in thread* [PATCH 8/9] netfilter: nft_log: request explicit logger when loading rules
2014-06-25 12:32 [PATCH 0/9] Netfilter packet logging updates (v2) Pablo Neira Ayuso
` (6 preceding siblings ...)
2014-06-25 12:32 ` [PATCH 7/9] netfilter: bridge: add generic " Pablo Neira Ayuso
@ 2014-06-25 12:32 ` Pablo Neira Ayuso
2014-06-25 12:32 ` [PATCH 9/9] netfilter: nft_log: complete logging support Pablo Neira Ayuso
8 siblings, 0 replies; 12+ messages in thread
From: Pablo Neira Ayuso @ 2014-06-25 12:32 UTC (permalink / raw)
To: netfilter-devel; +Cc: kaber
This includes the special handling for NFPROTO_INET. There is
no real inet logger since we don't see packets of this family.
However, rules are loaded using this special family type. So
let's just request both IPV4 and IPV6 loggers.
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
---
net/netfilter/nft_log.c | 24 +++++++++++++++++++++++-
1 file changed, 23 insertions(+), 1 deletion(-)
diff --git a/net/netfilter/nft_log.c b/net/netfilter/nft_log.c
index 10cfb15..55d4297 100644
--- a/net/netfilter/nft_log.c
+++ b/net/netfilter/nft_log.c
@@ -50,6 +50,7 @@ static int nft_log_init(const struct nft_ctx *ctx,
struct nft_log *priv = nft_expr_priv(expr);
struct nf_loginfo *li = &priv->loginfo;
const struct nlattr *nla;
+ int ret;
nla = tb[NFTA_LOG_PREFIX];
if (nla != NULL) {
@@ -71,16 +72,37 @@ static int nft_log_init(const struct nft_ctx *ctx,
ntohs(nla_get_be16(tb[NFTA_LOG_QTHRESHOLD]));
}
- return 0;
+ if (ctx->afi->family == NFPROTO_INET) {
+ ret = nf_logger_find_get(NFPROTO_IPV4, li->type);
+ if (ret < 0)
+ return ret;
+
+ ret = nf_logger_find_get(NFPROTO_IPV6, li->type);
+ if (ret < 0) {
+ nf_logger_put(NFPROTO_IPV4, li->type);
+ return ret;
+ }
+ return 0;
+ }
+
+ return nf_logger_find_get(ctx->afi->family, li->type);
}
static void nft_log_destroy(const struct nft_ctx *ctx,
const struct nft_expr *expr)
{
struct nft_log *priv = nft_expr_priv(expr);
+ struct nf_loginfo *li = &priv->loginfo;
if (priv->prefix != nft_log_null_prefix)
kfree(priv->prefix);
+
+ if (ctx->afi->family == NFPROTO_INET) {
+ nf_logger_put(NFPROTO_IPV4, li->type);
+ nf_logger_put(NFPROTO_IPV6, li->type);
+ } else {
+ nf_logger_put(ctx->afi->family, li->type);
+ }
}
static int nft_log_dump(struct sk_buff *skb, const struct nft_expr *expr)
--
1.7.10.4
^ permalink raw reply related [flat|nested] 12+ messages in thread* [PATCH 9/9] netfilter: nft_log: complete logging support
2014-06-25 12:32 [PATCH 0/9] Netfilter packet logging updates (v2) Pablo Neira Ayuso
` (7 preceding siblings ...)
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 ` Pablo Neira Ayuso
2014-06-26 11:37 ` Patrick McHardy
8 siblings, 1 reply; 12+ messages in thread
From: Pablo Neira Ayuso @ 2014-06-25 12:32 UTC (permalink / raw)
To: netfilter-devel; +Cc: kaber
Use the unified nf_log_packet() interface that allows us explicit
logger selection through the nf_loginfo structure.
If you specify the group attribute, this means you want to receive
logging messages through nfnetlink_log. In that case, the snaplen
and qthreshold attributes allows you to tune internal aspects of
the netlink logging infrastructure.
On the other hand, if the level is specified, then the plain text
format through the kernel logging ring is used instead, which is
also used by default if neither group nor level are indicated.
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
---
include/uapi/linux/netfilter/nf_tables.h | 4 ++
net/netfilter/nft_log.c | 76 +++++++++++++++++++++++-------
2 files changed, 63 insertions(+), 17 deletions(-)
diff --git a/include/uapi/linux/netfilter/nf_tables.h b/include/uapi/linux/netfilter/nf_tables.h
index 2a88f64..5ce21e3 100644
--- a/include/uapi/linux/netfilter/nf_tables.h
+++ b/include/uapi/linux/netfilter/nf_tables.h
@@ -697,6 +697,8 @@ enum nft_counter_attributes {
* @NFTA_LOG_PREFIX: prefix to prepend to log messages (NLA_STRING)
* @NFTA_LOG_SNAPLEN: length of payload to include in netlink message (NLA_U32)
* @NFTA_LOG_QTHRESHOLD: queue threshold (NLA_U32)
+ * @NFTA_LOG_SYSLOG: syslog level (NLA_U32)
+ * @NFTA_LOG_FLAGS: logging flags (NLA_U32)
*/
enum nft_log_attributes {
NFTA_LOG_UNSPEC,
@@ -704,6 +706,8 @@ enum nft_log_attributes {
NFTA_LOG_PREFIX,
NFTA_LOG_SNAPLEN,
NFTA_LOG_QTHRESHOLD,
+ NFTA_LOG_SYSLOG,
+ NFTA_LOG_FLAGS,
__NFTA_LOG_MAX
};
#define NFTA_LOG_MAX (__NFTA_LOG_MAX - 1)
diff --git a/net/netfilter/nft_log.c b/net/netfilter/nft_log.c
index 55d4297..e930afc 100644
--- a/net/netfilter/nft_log.c
+++ b/net/netfilter/nft_log.c
@@ -1,5 +1,6 @@
/*
* Copyright (c) 2008-2009 Patrick McHardy <kaber@trash.net>
+ * Copyright (c) 2012-2014 Pablo Neira Ayuso <pablo@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
@@ -41,6 +42,8 @@ static const struct nla_policy nft_log_policy[NFTA_LOG_MAX + 1] = {
[NFTA_LOG_PREFIX] = { .type = NLA_STRING },
[NFTA_LOG_SNAPLEN] = { .type = NLA_U32 },
[NFTA_LOG_QTHRESHOLD] = { .type = NLA_U16 },
+ [NFTA_LOG_SYSLOG] = { .type = NLA_U32 },
+ [NFTA_LOG_FLAGS] = { .type = NLA_U32 },
};
static int nft_log_init(const struct nft_ctx *ctx,
@@ -58,18 +61,41 @@ static int nft_log_init(const struct nft_ctx *ctx,
if (priv->prefix == NULL)
return -ENOMEM;
nla_strlcpy(priv->prefix, nla, nla_len(nla) + 1);
- } else
+ } else {
priv->prefix = (char *)nft_log_null_prefix;
+ }
- li->type = NF_LOG_TYPE_ULOG;
+ li->type = NF_LOG_TYPE_LOG;
+ if (tb[NFTA_LOG_SYSLOG] != NULL &&
+ tb[NFTA_LOG_GROUP] != NULL)
+ return -EINVAL;
if (tb[NFTA_LOG_GROUP] != NULL)
+ li->type = NF_LOG_TYPE_ULOG;
+
+ switch (li->type) {
+ case NF_LOG_TYPE_LOG:
+ if (tb[NFTA_LOG_SYSLOG] != NULL) {
+ li->u.log.level =
+ ntohl(nla_get_be32(tb[NFTA_LOG_SYSLOG]));;
+ } else {
+ li->u.log.level = 4;
+ }
+ if (tb[NFTA_LOG_FLAGS] != NULL) {
+ li->u.log.logflags =
+ ntohl(nla_get_be32(tb[NFTA_LOG_FLAGS]));
+ }
+ break;
+ case NF_LOG_TYPE_ULOG:
li->u.ulog.group = ntohs(nla_get_be16(tb[NFTA_LOG_GROUP]));
-
- if (tb[NFTA_LOG_SNAPLEN] != NULL)
- li->u.ulog.copy_len = ntohl(nla_get_be32(tb[NFTA_LOG_SNAPLEN]));
- if (tb[NFTA_LOG_QTHRESHOLD] != NULL) {
- li->u.ulog.qthreshold =
- ntohs(nla_get_be16(tb[NFTA_LOG_QTHRESHOLD]));
+ if (tb[NFTA_LOG_SNAPLEN] != NULL) {
+ li->u.ulog.copy_len =
+ ntohl(nla_get_be32(tb[NFTA_LOG_SNAPLEN]));
+ }
+ if (tb[NFTA_LOG_QTHRESHOLD] != NULL) {
+ li->u.ulog.qthreshold =
+ ntohs(nla_get_be16(tb[NFTA_LOG_QTHRESHOLD]));
+ }
+ break;
}
if (ctx->afi->family == NFPROTO_INET) {
@@ -113,17 +139,33 @@ static int nft_log_dump(struct sk_buff *skb, const struct nft_expr *expr)
if (priv->prefix != nft_log_null_prefix)
if (nla_put_string(skb, NFTA_LOG_PREFIX, priv->prefix))
goto nla_put_failure;
- if (li->u.ulog.group)
- if (nla_put_be16(skb, NFTA_LOG_GROUP, htons(li->u.ulog.group)))
- goto nla_put_failure;
- if (li->u.ulog.copy_len)
- if (nla_put_be32(skb, NFTA_LOG_SNAPLEN,
- htonl(li->u.ulog.copy_len)))
+ switch (li->type) {
+ case NF_LOG_TYPE_LOG:
+ if (nla_put_be32(skb, NFTA_LOG_SYSLOG, htonl(li->u.log.level)))
goto nla_put_failure;
- if (li->u.ulog.qthreshold)
- if (nla_put_be16(skb, NFTA_LOG_QTHRESHOLD,
- htons(li->u.ulog.qthreshold)))
+
+ if (li->u.log.logflags) {
+ if (nla_put_be32(skb, NFTA_LOG_FLAGS,
+ htonl(li->u.log.logflags)))
+ goto nla_put_failure;
+ }
+ break;
+ case NF_LOG_TYPE_ULOG:
+ if (nla_put_be16(skb, NFTA_LOG_GROUP, htons(li->u.ulog.group)))
goto nla_put_failure;
+
+ if (li->u.ulog.copy_len) {
+ if (nla_put_be32(skb, NFTA_LOG_SNAPLEN,
+ htonl(li->u.ulog.copy_len)))
+ goto nla_put_failure;
+ }
+ if (li->u.ulog.qthreshold) {
+ if (nla_put_be16(skb, NFTA_LOG_QTHRESHOLD,
+ htons(li->u.ulog.qthreshold)))
+ goto nla_put_failure;
+ }
+ break;
+ }
return 0;
nla_put_failure:
--
1.7.10.4
^ permalink raw reply related [flat|nested] 12+ messages in thread* Re: [PATCH 9/9] netfilter: nft_log: complete logging support
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
0 siblings, 1 reply; 12+ messages in thread
From: Patrick McHardy @ 2014-06-26 11:37 UTC (permalink / raw)
To: Pablo Neira Ayuso; +Cc: netfilter-devel
On Wed, Jun 25, 2014 at 02:32:43PM +0200, Pablo Neira Ayuso wrote:
> + switch (li->type) {
> + case NF_LOG_TYPE_LOG:
> + if (tb[NFTA_LOG_SYSLOG] != NULL) {
> + li->u.log.level =
> + ntohl(nla_get_be32(tb[NFTA_LOG_SYSLOG]));;
> + } else {
> + li->u.log.level = 4;
> + }
I'd suggest to call it what it is, NFTA_LOG_LEVEL. Besides this minor issue,
the patches look good to me.
^ permalink raw reply [flat|nested] 12+ messages in thread* Re: [PATCH 9/9] netfilter: nft_log: complete logging support
2014-06-26 11:37 ` Patrick McHardy
@ 2014-06-27 11:39 ` Pablo Neira Ayuso
0 siblings, 0 replies; 12+ messages in thread
From: Pablo Neira Ayuso @ 2014-06-27 11:39 UTC (permalink / raw)
To: Patrick McHardy; +Cc: netfilter-devel
On Thu, Jun 26, 2014 at 01:37:30PM +0200, Patrick McHardy wrote:
> On Wed, Jun 25, 2014 at 02:32:43PM +0200, Pablo Neira Ayuso wrote:
> > + switch (li->type) {
> > + case NF_LOG_TYPE_LOG:
> > + if (tb[NFTA_LOG_SYSLOG] != NULL) {
> > + li->u.log.level =
> > + ntohl(nla_get_be32(tb[NFTA_LOG_SYSLOG]));;
> > + } else {
> > + li->u.log.level = 4;
> > + }
>
> I'd suggest to call it what it is, NFTA_LOG_LEVEL. Besides this minor issue,
> the patches look good to me.
I'm going to locally edit this and push this. Thanks Patrick.
^ permalink raw reply [flat|nested] 12+ messages in thread