Release 4.11 net/netfilter/nfnetlink_log.c

/*
 * This is a module which is used for logging packets to userspace via
 * nfetlink.
 *
 * (C) 2005 by Harald Welte <laforge@netfilter.org>
 * (C) 2006-2012 Patrick McHardy <kaber@trash.net>
 *
 * Based on the old ipv4-only ipt_ULOG.c:
 * (C) 2000-2004 by 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.
 */


#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/module.h>
#include <linux/skbuff.h>
#include <linux/if_arp.h>
#include <linux/init.h>
#include <linux/ip.h>
#include <linux/ipv6.h>
#include <linux/netdevice.h>
#include <linux/netfilter.h>
#include <linux/netfilter_bridge.h>
#include <net/netlink.h>
#include <linux/netfilter/nfnetlink.h>
#include <linux/netfilter/nfnetlink_log.h>
#include <linux/netfilter/nf_conntrack_common.h>
#include <linux/spinlock.h>
#include <linux/sysctl.h>
#include <linux/proc_fs.h>
#include <linux/security.h>
#include <linux/list.h>
#include <linux/slab.h>
#include <net/sock.h>
#include <net/netfilter/nf_log.h>
#include <net/netns/generic.h>
#include <net/netfilter/nfnetlink_log.h>

#include <linux/atomic.h>

#if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
#include "../bridge/br_private.h"
#endif


#define NFULNL_NLBUFSIZ_DEFAULT	NLMSG_GOODSIZE

#define NFULNL_TIMEOUT_DEFAULT 	100	
/* every second */

#define NFULNL_QTHRESH_DEFAULT 	100	
/* 100 packets */
/* max packet size is limited by 16-bit struct nfattr nfa_len field */

#define NFULNL_COPY_RANGE_MAX	(0xFFFF - NLA_HDRLEN)


#define PRINTR(x, args...)	do { if (net_ratelimit()) \
                                     printk(x, ## args); } while (0);


struct nfulnl_instance {
	
struct hlist_node hlist;	/* global list of instances */
	
spinlock_t lock;
	
atomic_t use;			/* use count */

	
unsigned int qlen;		/* number of nlmsgs in skb */
	
struct sk_buff *skb;		/* pre-allocatd skb */
	
struct timer_list timer;
	
struct net *net;
	
struct user_namespace *peer_user_ns;	/* User namespace of the peer process */
	
u32 peer_portid;		/* PORTID of the peer process */

	/* configurable parameters */
	
unsigned int flushtimeout;	/* timeout until queue flush */
	
unsigned int nlbufsiz;		/* netlink buffer allocation size */
	
unsigned int qthreshold;	/* threshold of the queue */
	
u_int32_t copy_range;
	
u_int32_t seq;			/* instance-local sequential counter */
	
u_int16_t group_num;		/* number of this queue */
	
u_int16_t flags;
	
u_int8_t copy_mode;
	
struct rcu_head rcu;
};


#define INSTANCE_BUCKETS	16


static unsigned int nfnl_log_net_id __read_mostly;


struct nfnl_log_net {
	
spinlock_t instances_lock;
	
struct hlist_head instance_table[INSTANCE_BUCKETS];
	
atomic_t global_seq;
};



static struct nfnl_log_net *nfnl_log_pernet(struct net *net)
{
	return net_generic(net, nfnl_log_net_id);
}

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static inline u_int8_t instance_hashfn(u_int16_t group_num)
{
	return ((group_num & 0xff) % INSTANCE_BUCKETS);
}

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static struct nfulnl_instance *

__instance_lookup(struct nfnl_log_net *log, u_int16_t group_num)
{
	struct hlist_head *head;
	struct nfulnl_instance *inst;

	head = &log->instance_table[instance_hashfn(group_num)];
	hlist_for_each_entry_rcu(inst, head, hlist) {
		if (inst->group_num == group_num)
			return inst;
	}
	return NULL;
}

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7
11.11%
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static inline void

instance_get(struct nfulnl_instance *inst)
{
	atomic_inc(&inst->use);
}

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static struct nfulnl_instance *

instance_lookup_get(struct nfnl_log_net *log, u_int16_t group_num)
{
	struct nfulnl_instance *inst;

	rcu_read_lock_bh();
	inst = __instance_lookup(log, group_num);
	if (inst && !atomic_inc_not_zero(&inst->use))
		inst = NULL;
	rcu_read_unlock_bh();

	return inst;
}

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14
25.00%
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Gao Feng
7
12.50%
1
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56
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static void nfulnl_instance_free_rcu(struct rcu_head *head)
{
	struct nfulnl_instance *inst =
		container_of(head, struct nfulnl_instance, rcu);

	put_net(inst->net);
	kfree(inst);
	module_put(THIS_MODULE);
}

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static void

instance_put(struct nfulnl_instance *inst)
{
	if (inst && atomic_dec_and_test(&inst->use))
		call_rcu_bh(&inst->rcu, nfulnl_instance_free_rcu);
}

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static void nfulnl_timer(unsigned long data);


static struct nfulnl_instance *

instance_create(struct net *net, u_int16_t group_num,
		u32 portid, struct user_namespace *user_ns)
{
	struct nfulnl_instance *inst;
	struct nfnl_log_net *log = nfnl_log_pernet(net);
	int err;

	spin_lock_bh(&log->instances_lock);
	if (__instance_lookup(log, group_num)) {
		err = -EEXIST;
		goto out_unlock;
	}

	inst = kzalloc(sizeof(*inst), GFP_ATOMIC);
	if (!inst) {
		err = -ENOMEM;
		goto out_unlock;
	}

	if (!try_module_get(THIS_MODULE)) {
		kfree(inst);
		err = -EAGAIN;
		goto out_unlock;
	}

	INIT_HLIST_NODE(&inst->hlist);
	spin_lock_init(&inst->lock);
	/* needs to be two, since we _put() after creation */
	atomic_set(&inst->use, 2);

	setup_timer(&inst->timer, nfulnl_timer, (unsigned long)inst);

	inst->net = get_net(net);
	inst->peer_user_ns = user_ns;
	inst->peer_portid = portid;
	inst->group_num = group_num;

	inst->qthreshold 	= NFULNL_QTHRESH_DEFAULT;
	inst->flushtimeout 	= NFULNL_TIMEOUT_DEFAULT;
	inst->nlbufsiz 		= NFULNL_NLBUFSIZ_DEFAULT;
	inst->copy_mode 	= NFULNL_COPY_PACKET;
	inst->copy_range 	= NFULNL_COPY_RANGE_MAX;

	hlist_add_head_rcu(&inst->hlist,
		       &log->instance_table[instance_hashfn(group_num)]);


	spin_unlock_bh(&log->instances_lock);

	return inst;

out_unlock:
	spin_unlock_bh(&log->instances_lock);
	return ERR_PTR(err);
}

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164
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34
12.78%
1
7.69%
Patrick McHardy
26
9.77%
2
15.38%
Michał Mirosław
19
7.14%
2
15.38%
Eric W. Biedermann
14
5.26%
2
15.38%
Eric Dumazet
4
1.50%
2
15.38%
Hideaki Yoshifuji / 吉藤英明
4
1.50%
1
7.69%
Richard Weinberger
1
0.38%
1
7.69%
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266
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13
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static void __nfulnl_flush(struct nfulnl_instance *inst);

/* called with BH disabled */

static void

__instance_destroy(struct nfulnl_instance *inst)
{
	/* first pull it out of the global list */
	hlist_del_rcu(&inst->hlist);

	/* then flush all pending packets from skb */

	spin_lock(&inst->lock);

	/* lockless readers wont be able to use us */
	inst->copy_mode = NFULNL_COPY_DISABLED;

	if (inst->skb)
		__nfulnl_flush(inst);
	spin_unlock(&inst->lock);

	/* and finally put the refcount */
	instance_put(inst);
}

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Harald Welte
49
80.33%
1
25.00%
Eric Dumazet
10
16.39%
1
25.00%
Michał Mirosław
1
1.64%
1
25.00%
Patrick McHardy
1
1.64%
1
25.00%
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61
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4
100.00%


static inline void

instance_destroy(struct nfnl_log_net *log,
		 struct nfulnl_instance *inst)
{
	spin_lock_bh(&log->instances_lock);
	__instance_destroy(inst);
	spin_unlock_bh(&log->instances_lock);
}

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18
47.37%
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Gao Feng
9
23.68%
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Patrick McHardy
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23.68%
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Eric Dumazet
2
5.26%
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static int

nfulnl_set_mode(struct nfulnl_instance *inst, u_int8_t mode,
		  unsigned int range)
{
	int status = 0;

	spin_lock_bh(&inst->lock);

	switch (mode) {
	case NFULNL_COPY_NONE:
	case NFULNL_COPY_META:
		inst->copy_mode = mode;
		inst->copy_range = 0;
		break;

	case NFULNL_COPY_PACKET:
		inst->copy_mode = mode;
		if (range == 0)
			range = NFULNL_COPY_RANGE_MAX;
		inst->copy_range = min_t(unsigned int,
					 range, NFULNL_COPY_RANGE_MAX);
		break;

	default:
		status = -EINVAL;
		break;
	}

	spin_unlock_bh(&inst->lock);

	return status;
}

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10
9.35%
1
33.33%
Michał Mirosław
8
7.48%
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33.33%
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static int

nfulnl_set_nlbufsiz(struct nfulnl_instance *inst, u_int32_t nlbufsiz)
{
	int status;

	spin_lock_bh(&inst->lock);
	if (nlbufsiz < NFULNL_NLBUFSIZ_DEFAULT)
		status = -ERANGE;
	else if (nlbufsiz > 131072)
		status = -ERANGE;
	else {
		inst->nlbufsiz = nlbufsiz;
		status = 0;
	}
	spin_unlock_bh(&inst->lock);

	return status;
}

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static void

nfulnl_set_timeout(struct nfulnl_instance *inst, u_int32_t timeout)
{
	spin_lock_bh(&inst->lock);
	inst->flushtimeout = timeout;
	spin_unlock_bh(&inst->lock);
}

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35
97.22%
1
50.00%
Rami Rosen
1
2.78%
1
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36
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100.00%


static void

nfulnl_set_qthresh(struct nfulnl_instance *inst, u_int32_t qthresh)
{
	spin_lock_bh(&inst->lock);
	inst->qthreshold = qthresh;
	spin_unlock_bh(&inst->lock);
}

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Harald Welte
35
97.22%
1
50.00%
Rami Rosen
1
2.78%
1
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36
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2
100.00%


static int

nfulnl_set_flags(struct nfulnl_instance *inst, u_int16_t flags)
{
	spin_lock_bh(&inst->lock);
	inst->flags = flags;
	spin_unlock_bh(&inst->lock);

	return 0;
}

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static struct sk_buff *

nfulnl_alloc_skb(struct net *net, u32 peer_portid, unsigned int inst_size,
		 unsigned int pkt_size)
{
	struct sk_buff *skb;
	unsigned int n;

	/* alloc skb which should be big enough for a whole multipart
         * message.  WARNING: has to be <= 128k due to slab restrictions */

	n = max(inst_size, pkt_size);
	skb = alloc_skb(n, GFP_ATOMIC | __GFP_NOWARN);
	if (!skb) {
		if (n > pkt_size) {
			/* try to allocate only as much as we need for current
                         * packet */

			skb = alloc_skb(pkt_size, GFP_ATOMIC);
		}
	}

	return skb;
}

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Harald Welte
47
57.32%
1
16.67%
Patrick McHardy
26
31.71%
2
33.33%
Gao Feng
5
6.10%
1
16.67%
Florian Westphal
2
2.44%
1
16.67%
Calvin Owens
2
2.44%
1
16.67%
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82
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6
100.00%


static void

__nfulnl_send(struct nfulnl_instance *inst)
{
	if (inst->qlen > 1) {
		struct nlmsghdr *nlh = nlmsg_put(inst->skb, 0, 0,
						 NLMSG_DONE,
						 sizeof(struct nfgenmsg),
						 0);
		if (WARN_ONCE(!nlh, "bad nlskb size: %u, tailroom %d\n",
			      inst->skb->len, skb_tailroom(inst->skb))) {
			kfree_skb(inst->skb);
			goto out;
		}
	}
	nfnetlink_unicast(inst->skb, inst->net, inst->peer_portid,
			  MSG_DONTWAIT);
out:
	inst->qlen = 0;
	inst->skb = NULL;
}

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14.29%
Houcheng Lin
30
26.55%
1
14.29%
David S. Miller
19
16.81%
1
14.29%
Eric Leblond
14
12.39%
1
14.29%
Gao Feng
3
2.65%
1
14.29%
Eric W. Biedermann
1
0.88%
1
14.29%
Alexey Dobriyan
1
0.88%
1
14.29%
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static void

__nfulnl_flush(struct nfulnl_instance *inst)
{
	/* timer holds a reference */
	if (del_timer(&inst->timer))
		instance_put(inst);
	if (inst->skb)
		__nfulnl_send(inst);
}

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static void

nfulnl_timer(unsigned long data)
{
	struct nfulnl_instance *inst = (struct nfulnl_instance *)data;

	spin_lock_bh(&inst->lock);
	if (inst->skb)
		__nfulnl_send(inst);
	spin_unlock_bh(&inst->lock);
	instance_put(inst);
}

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20.37%
2
66.67%
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54
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/* This is an inline function, we don't really care about a long
 * list of arguments */

static inline int

__build_packet_message(struct nfnl_log_net *log,
			struct nfulnl_instance *inst,
			const struct sk_buff *skb,
			unsigned int data_len,
			u_int8_t pf,
			unsigned int hooknum,
			const struct net_device *indev,
			const struct net_device *outdev,
			const char *prefix, unsigned int plen,
			const struct nfnl_ct_hook *nfnl_ct,
			struct nf_conn *ct, enum ip_conntrack_info ctinfo)
{
	struct nfulnl_msg_packet_hdr pmsg;
	struct nlmsghdr *nlh;
	struct nfgenmsg *nfmsg;
	sk_buff_data_t old_tail = inst->skb->tail;
	struct sock *sk;
	const unsigned char *hwhdrp;

	nlh = nlmsg_put(inst->skb, 0, 0,
			NFNL_SUBSYS_ULOG << 8 | NFULNL_MSG_PACKET,
			sizeof(struct nfgenmsg), 0);
	if (!nlh)
		return -1;
	nfmsg = nlmsg_data(nlh);
	nfmsg->nfgen_family = pf;
	nfmsg->version = NFNETLINK_V0;
	nfmsg->res_id = htons(inst->group_num);

	memset(&pmsg, 0, sizeof(pmsg));
	pmsg.hw_protocol	= skb->protocol;
	pmsg.hook		= hooknum;

	if (nla_put(inst->skb, NFULA_PACKET_HDR, sizeof(pmsg), &pmsg))
		goto nla_put_failure;

	if (prefix &&
	    nla_put(inst->skb, NFULA_PREFIX, plen, prefix))
		goto nla_put_failure;

	if (indev) {
#if !IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
		if (nla_put_be32(inst->skb, NFULA_IFINDEX_INDEV,
				 htonl(indev->ifindex)))
			goto nla_put_failure;
#else
		if (pf == PF_BRIDGE) {
			/* Case 1: outdev is physical input device, we need to
                         * look for bridge group (when called from
                         * netfilter_bridge) */
			if (nla_put_be32(inst->skb, NFULA_IFINDEX_PHYSINDEV,
					 htonl(indev->ifindex)) ||
			/* this is the bridge group "brX" */
			/* rcu_read_lock()ed by nf_hook_thresh or
                         * nf_log_packet.
                         */
			    nla_put_be32(inst->skb, NFULA_IFINDEX_INDEV,
					 htonl(br_port_get_rcu(indev)->br->dev->ifindex)))
				goto nla_put_failure;
		} else {
			struct net_device *physindev;

			/* Case 2: indev is bridge group, we need to look for
                         * physical device (when called from ipv4) */
			if (nla_put_be32(inst->skb, NFULA_IFINDEX_INDEV,
					 htonl(indev->ifindex)))
				goto nla_put_failure;

			physindev = nf_bridge_get_physindev(skb);
			if (physindev &&
			    nla_put_be32(inst->skb, NFULA_IFINDEX_PHYSINDEV,
					 htonl(physindev->ifindex)))
				goto nla_put_failure;
		}
#endif
	}

	if (outdev) {
#if !IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
		if (nla_put_be32(inst->skb, NFULA_IFINDEX_OUTDEV,
				 htonl(outdev->ifindex)))
			goto nla_put_failure;
#else
		if (pf == PF_BRIDGE) {
			/* Case 1: outdev is physical output device, we need to
                         * look for bridge group (when called from
                         * netfilter_bridge) */
			if (nla_put_be32(inst->skb, NFULA_IFINDEX_PHYSOUTDEV,
					 htonl(outdev->ifindex)) ||
			/* this is the bridge group "brX" */
			/* rcu_read_lock()ed by nf_hook_thresh or
                         * nf_log_packet.
                         */
			    nla_put_be32(inst->skb, NFULA_IFINDEX_OUTDEV,
					 htonl(br_port_get_rcu(outdev)->br->dev->ifindex)))
				goto nla_put_failure;
		} else {
			struct net_device *physoutdev;

			/* Case 2: indev is a bridge group, we need to look
                         * for physical device (when called from ipv4) */
			if (nla_put_be32(inst->skb, NFULA_IFINDEX_OUTDEV,
					 htonl(outdev->ifindex)))
				goto nla_put_failure;

			physoutdev = nf_bridge_get_physoutdev(skb);
			if (physoutdev &&
			    nla_put_be32(inst->skb, NFULA_IFINDEX_PHYSOUTDEV,
					 htonl(physoutdev->ifindex)))
				goto nla_put_failure;
		}
#endif
	}

	if (skb->mark &&
	    nla_put_be32(inst->skb, NFULA_MARK, htonl(skb->mark)))
		goto nla_put_failure;

	if (indev && skb->dev &&
	    skb->mac_header != skb->network_header) {
		struct nfulnl_msg_packet_hw phw;
		int len;

		memset(&phw, 0, sizeof(phw));
		len = dev_parse_header(skb, phw.hw_addr);
		if (len > 0) {
			phw.hw_addrlen = htons(len);
			if (nla_put(inst->skb, NFULA_HWADDR, sizeof(phw), &phw))
				goto nla_put_failure;
		}
	}

	if (indev && skb_mac_header_was_set(skb)) {
		if (nla_put_be16(inst->skb, NFULA_HWTYPE, htons(skb->dev->type)) ||
		    nla_put_be16(inst->skb, NFULA_HWLEN,
				 htons(skb->dev->hard_header_len)))
			goto nla_put_failure;

		hwhdrp = skb_mac_header(skb);

		if (skb->dev->type == ARPHRD_SIT)
			hwhdrp -= ETH_HLEN;

		if (hwhdrp >= skb->head &&
		    nla_put(inst->skb, NFULA_HWHEADER,
			    skb->dev->hard_header_len, hwhdrp))
			goto nla_put_failure;
	}

	if (skb->tstamp) {
		struct nfulnl_msg_packet_timestamp ts;
		struct timespec64 kts = ktime_to_timespec64(skb->tstamp);
		ts.sec = cpu_to_be64(kts.tv_sec);
		ts.usec = cpu_to_be64(kts.tv_nsec / NSEC_PER_USEC);

		if (nla_put(inst->skb, NFULA_TIMESTAMP, sizeof(ts), &ts))
			goto nla_put_failure;
	}

	/* UID */
	sk = skb->sk;
	if (sk && sk_fullsock(sk)) {
		read_lock_bh(&sk->sk_callback_lock);
		if (sk->sk_socket && sk->sk_socket->file) {
			struct file *file = sk->sk_socket->file;
			const struct cred *cred = file->f_cred;
			struct user_namespace *user_ns = inst->peer_user_ns;
			__be32 uid = htonl(from_kuid_munged(user_ns, cred->fsuid));
			__be32 gid = htonl(from_kgid_munged(user_ns, cred->fsgid));
			read_unlock_bh(&sk->sk_callback_lock);
			if (nla_put_be32(inst->skb, NFULA_UID, uid) ||
			    nla_put_be32(inst->skb, NFULA_GID, gid))
				goto nla_put_failure;
		} else
			read_unlock_bh(&sk->sk_callback_lock);
	}

	/* local sequence number */
	if ((inst->flags & NFULNL_CFG_F_SEQ) &&
	    nla_put_be32(inst->skb, NFULA_SEQ, htonl(inst->seq++)))
		goto nla_put_failure;

	/* global sequence number */
	if ((inst->flags & NFULNL_CFG_F_SEQ_GLOBAL) &&
	    nla_put_be32(inst->skb, NFULA_SEQ_GLOBAL,
			 htonl(atomic_inc_return(&log->global_seq))))
		goto nla_put_failure;

	if (ct && nfnl_ct->build(inst->skb, ct, ctinfo,
				 NFULA_CT, NFULA_CT_INFO) < 0)
		goto nla_put_failure;

	if (data_len) {
		struct nlattr *nla;
		int size = nla_attr_size(data_len);

		if (skb_tailroom(inst->skb) < nla_total_size(data_len))
			goto nla_put_failure;

		nla = (struct nlattr *)skb_put(inst->skb, nla_total_size(data_len));
		nla->nla_type = NFULA_PAYLOAD;
		nla->nla_len = size;

		if (skb_copy_bits(skb, 0, nla_data(nla), data_len))
			BUG();
	}

	nlh->nlmsg_len = inst->skb->tail - old_tail;
	return 0;

nla_put_failure:
	PRINTR(KERN_ERR "nfnetlink_log: error creating log nlmsg\n");
	return -1;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Harald Welte
607
51.62%
3
8.33%
David S. Miller
138
11.73%
2
5.56%
Patrick McHardy
106
9.01%
8
22.22%
Eric Leblond
57
4.85%
1
2.78%
Ken-ichirou MATSUZAWA
41
3.49%
1
2.78%
Bob Hockney
40
3.40%
1
2.78%
Dan Carpenter
30
2.55%
1
2.78%
Eric Dumazet
25
2.13%
3
8.33%
Florian Westphal
24
2.04%
1
2.78%
Linus Torvalds
23
1.96%
1
2.78%
Pablo Neira Ayuso
15
1.28%
2
5.56%
David Howells
14
1.19%
1
2.78%
Stephen Hemminger
9
0.77%
1
2.78%
Arnd Bergmann
8
0.68%
1
2.78%
Eric W. Biedermann
8
0.68%
1
2.78%
Nicolas Cavallari
8
0.68%
1
2.78%
Gao Feng
7
0.60%
1
2.78%
Jiri Pirko
6
0.51%
1
2.78%
Al Viro
3
0.26%
1
2.78%
Arnaldo Carvalho de Melo
3
0.26%
1
2.78%
Aaron Conole
2
0.17%
1
2.78%
Jan Engelhardt
1
0.09%
1
2.78%
Thomas Graf
1
0.09%
1
2.78%
Total
1176
100.00%
36
100.00%


static struct nf_loginfo default_loginfo = {
	.type =		NF_LOG_TYPE_ULOG,
	.u = {
		.ulog = {
			.copy_len	= 0xffff,
			.group		= 0,
			.qthreshold	= 1,
                },
        },
};

/* log handler for internal netfilter logging api */

void

nfulnl_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_user,
		  const char *prefix)
{
	size_t size;
	unsigned int data_len;
	struct nfulnl_instance *inst;
	const struct nf_loginfo *li;
	unsigned int qthreshold;
	unsigned int plen;
	struct nfnl_log_net *log = nfnl_log_pernet(net);
	const struct nfnl_ct_hook *nfnl_ct = NULL;
	struct nf_conn *ct = NULL;
	enum ip_conntrack_info uninitialized_var(ctinfo);

	if (li_user && li_user->type == NF_LOG_TYPE_ULOG)
		li = li_user