2 * This is a module which is used for queueing packets and communicating with
3 * userspace via nfnetlink.
5 * (C) 2005 by Harald Welte <laforge@netfilter.org>
6 * (C) 2007 by Patrick McHardy <kaber@trash.net>
8 * Based on the old ipv4-only ip_queue.c:
9 * (C) 2000-2002 James Morris <jmorris@intercode.com.au>
10 * (C) 2003-2005 Netfilter Core Team <coreteam@netfilter.org>
12 * This program is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU General Public License version 2 as
14 * published by the Free Software Foundation.
17 #include <linux/module.h>
18 #include <linux/skbuff.h>
19 #include <linux/init.h>
20 #include <linux/spinlock.h>
21 #include <linux/slab.h>
22 #include <linux/notifier.h>
23 #include <linux/netdevice.h>
24 #include <linux/netfilter.h>
25 #include <linux/proc_fs.h>
26 #include <linux/netfilter_ipv4.h>
27 #include <linux/netfilter_ipv6.h>
28 #include <linux/netfilter_bridge.h>
29 #include <linux/netfilter/nfnetlink.h>
30 #include <linux/netfilter/nfnetlink_queue.h>
31 #include <linux/list.h>
33 #include <net/tcp_states.h>
34 #include <net/netfilter/nf_queue.h>
35 #include <net/netns/generic.h>
36 #include <net/netfilter/nfnetlink_queue.h>
38 #include <linux/atomic.h>
40 #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
41 #include "../bridge/br_private.h"
44 #define NFQNL_QMAX_DEFAULT 1024
46 /* We're using struct nlattr which has 16bit nla_len. Note that nla_len
47 * includes the header length. Thus, the maximum packet length that we
48 * support is 65531 bytes. We send truncated packets if the specified length
49 * is larger than that. Userspace can check for presence of NFQA_CAP_LEN
50 * attribute to detect truncation.
52 #define NFQNL_MAX_COPY_RANGE (0xffff - NLA_HDRLEN)
54 struct nfqnl_instance
{
55 struct hlist_node hlist
; /* global list of queues */
59 unsigned int queue_maxlen
;
60 unsigned int copy_range
;
61 unsigned int queue_dropped
;
62 unsigned int queue_user_dropped
;
65 u_int16_t queue_num
; /* number of this queue */
67 u_int32_t flags
; /* Set using NFQA_CFG_FLAGS */
69 * Following fields are dirtied for each queued packet,
70 * keep them in same cache line if possible.
73 unsigned int queue_total
;
74 unsigned int id_sequence
; /* 'sequence' of pkt ids */
75 struct list_head queue_list
; /* packets in queue */
78 typedef int (*nfqnl_cmpfn
)(struct nf_queue_entry
*, unsigned long);
80 static int nfnl_queue_net_id __read_mostly
;
82 #define INSTANCE_BUCKETS 16
83 struct nfnl_queue_net
{
84 spinlock_t instances_lock
;
85 struct hlist_head instance_table
[INSTANCE_BUCKETS
];
88 static struct nfnl_queue_net
*nfnl_queue_pernet(struct net
*net
)
90 return net_generic(net
, nfnl_queue_net_id
);
93 static inline u_int8_t
instance_hashfn(u_int16_t queue_num
)
95 return ((queue_num
>> 8) ^ queue_num
) % INSTANCE_BUCKETS
;
98 static struct nfqnl_instance
*
99 instance_lookup(struct nfnl_queue_net
*q
, u_int16_t queue_num
)
101 struct hlist_head
*head
;
102 struct nfqnl_instance
*inst
;
104 head
= &q
->instance_table
[instance_hashfn(queue_num
)];
105 hlist_for_each_entry_rcu(inst
, head
, hlist
) {
106 if (inst
->queue_num
== queue_num
)
112 static struct nfqnl_instance
*
113 instance_create(struct nfnl_queue_net
*q
, u_int16_t queue_num
,
116 struct nfqnl_instance
*inst
;
120 spin_lock(&q
->instances_lock
);
121 if (instance_lookup(q
, queue_num
)) {
126 inst
= kzalloc(sizeof(*inst
), GFP_ATOMIC
);
132 inst
->queue_num
= queue_num
;
133 inst
->peer_portid
= portid
;
134 inst
->queue_maxlen
= NFQNL_QMAX_DEFAULT
;
135 inst
->copy_range
= NFQNL_MAX_COPY_RANGE
;
136 inst
->copy_mode
= NFQNL_COPY_NONE
;
137 spin_lock_init(&inst
->lock
);
138 INIT_LIST_HEAD(&inst
->queue_list
);
140 if (!try_module_get(THIS_MODULE
)) {
145 h
= instance_hashfn(queue_num
);
146 hlist_add_head_rcu(&inst
->hlist
, &q
->instance_table
[h
]);
148 spin_unlock(&q
->instances_lock
);
155 spin_unlock(&q
->instances_lock
);
159 static void nfqnl_flush(struct nfqnl_instance
*queue
, nfqnl_cmpfn cmpfn
,
163 instance_destroy_rcu(struct rcu_head
*head
)
165 struct nfqnl_instance
*inst
= container_of(head
, struct nfqnl_instance
,
168 nfqnl_flush(inst
, NULL
, 0);
170 module_put(THIS_MODULE
);
174 __instance_destroy(struct nfqnl_instance
*inst
)
176 hlist_del_rcu(&inst
->hlist
);
177 call_rcu(&inst
->rcu
, instance_destroy_rcu
);
181 instance_destroy(struct nfnl_queue_net
*q
, struct nfqnl_instance
*inst
)
183 spin_lock(&q
->instances_lock
);
184 __instance_destroy(inst
);
185 spin_unlock(&q
->instances_lock
);
189 __enqueue_entry(struct nfqnl_instance
*queue
, struct nf_queue_entry
*entry
)
191 list_add_tail(&entry
->list
, &queue
->queue_list
);
192 queue
->queue_total
++;
196 __dequeue_entry(struct nfqnl_instance
*queue
, struct nf_queue_entry
*entry
)
198 list_del(&entry
->list
);
199 queue
->queue_total
--;
202 static struct nf_queue_entry
*
203 find_dequeue_entry(struct nfqnl_instance
*queue
, unsigned int id
)
205 struct nf_queue_entry
*entry
= NULL
, *i
;
207 spin_lock_bh(&queue
->lock
);
209 list_for_each_entry(i
, &queue
->queue_list
, list
) {
217 __dequeue_entry(queue
, entry
);
219 spin_unlock_bh(&queue
->lock
);
225 nfqnl_flush(struct nfqnl_instance
*queue
, nfqnl_cmpfn cmpfn
, unsigned long data
)
227 struct nf_queue_entry
*entry
, *next
;
229 spin_lock_bh(&queue
->lock
);
230 list_for_each_entry_safe(entry
, next
, &queue
->queue_list
, list
) {
231 if (!cmpfn
|| cmpfn(entry
, data
)) {
232 list_del(&entry
->list
);
233 queue
->queue_total
--;
234 nf_reinject(entry
, NF_DROP
);
237 spin_unlock_bh(&queue
->lock
);
241 nfqnl_put_packet_info(struct sk_buff
*nlskb
, struct sk_buff
*packet
,
246 if (packet
->ip_summed
== CHECKSUM_PARTIAL
)
247 flags
= NFQA_SKB_CSUMNOTREADY
;
248 else if (csum_verify
)
249 flags
= NFQA_SKB_CSUM_NOTVERIFIED
;
251 if (skb_is_gso(packet
))
252 flags
|= NFQA_SKB_GSO
;
254 return flags
? nla_put_be32(nlskb
, NFQA_SKB_INFO
, htonl(flags
)) : 0;
257 static int nfqnl_put_sk_uidgid(struct sk_buff
*skb
, struct sock
*sk
)
259 const struct cred
*cred
;
261 if (!sk_fullsock(sk
))
264 read_lock_bh(&sk
->sk_callback_lock
);
265 if (sk
->sk_socket
&& sk
->sk_socket
->file
) {
266 cred
= sk
->sk_socket
->file
->f_cred
;
267 if (nla_put_be32(skb
, NFQA_UID
,
268 htonl(from_kuid_munged(&init_user_ns
, cred
->fsuid
))))
269 goto nla_put_failure
;
270 if (nla_put_be32(skb
, NFQA_GID
,
271 htonl(from_kgid_munged(&init_user_ns
, cred
->fsgid
))))
272 goto nla_put_failure
;
274 read_unlock_bh(&sk
->sk_callback_lock
);
278 read_unlock_bh(&sk
->sk_callback_lock
);
282 static struct sk_buff
*
283 nfqnl_build_packet_message(struct net
*net
, struct nfqnl_instance
*queue
,
284 struct nf_queue_entry
*entry
,
285 __be32
**packet_id_ptr
)
288 size_t data_len
= 0, cap_len
= 0;
289 unsigned int hlen
= 0;
292 struct nfqnl_msg_packet_hdr
*pmsg
;
293 struct nlmsghdr
*nlh
;
294 struct nfgenmsg
*nfmsg
;
295 struct sk_buff
*entskb
= entry
->skb
;
296 struct net_device
*indev
;
297 struct net_device
*outdev
;
298 struct nf_conn
*ct
= NULL
;
299 enum ip_conntrack_info
uninitialized_var(ctinfo
);
302 size
= nlmsg_total_size(sizeof(struct nfgenmsg
))
303 + nla_total_size(sizeof(struct nfqnl_msg_packet_hdr
))
304 + nla_total_size(sizeof(u_int32_t
)) /* ifindex */
305 + nla_total_size(sizeof(u_int32_t
)) /* ifindex */
306 #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
307 + nla_total_size(sizeof(u_int32_t
)) /* ifindex */
308 + nla_total_size(sizeof(u_int32_t
)) /* ifindex */
310 + nla_total_size(sizeof(u_int32_t
)) /* mark */
311 + nla_total_size(sizeof(struct nfqnl_msg_packet_hw
))
312 + nla_total_size(sizeof(u_int32_t
)) /* skbinfo */
313 + nla_total_size(sizeof(u_int32_t
)); /* cap_len */
315 if (entskb
->tstamp
.tv64
)
316 size
+= nla_total_size(sizeof(struct nfqnl_msg_packet_timestamp
));
318 if (entry
->state
.hook
<= NF_INET_FORWARD
||
319 (entry
->state
.hook
== NF_INET_POST_ROUTING
&& entskb
->sk
== NULL
))
320 csum_verify
= !skb_csum_unnecessary(entskb
);
324 outdev
= entry
->state
.out
;
326 switch ((enum nfqnl_config_mode
)ACCESS_ONCE(queue
->copy_mode
)) {
327 case NFQNL_COPY_META
:
328 case NFQNL_COPY_NONE
:
331 case NFQNL_COPY_PACKET
:
332 if (!(queue
->flags
& NFQA_CFG_F_GSO
) &&
333 entskb
->ip_summed
== CHECKSUM_PARTIAL
&&
334 skb_checksum_help(entskb
))
337 data_len
= ACCESS_ONCE(queue
->copy_range
);
338 if (data_len
> entskb
->len
)
339 data_len
= entskb
->len
;
341 hlen
= skb_zerocopy_headlen(entskb
);
342 hlen
= min_t(unsigned int, hlen
, data_len
);
343 size
+= sizeof(struct nlattr
) + hlen
;
344 cap_len
= entskb
->len
;
348 if (queue
->flags
& NFQA_CFG_F_CONNTRACK
)
349 ct
= nfqnl_ct_get(entskb
, &size
, &ctinfo
);
351 if (queue
->flags
& NFQA_CFG_F_UID_GID
) {
352 size
+= (nla_total_size(sizeof(u_int32_t
)) /* uid */
353 + nla_total_size(sizeof(u_int32_t
))); /* gid */
356 skb
= nfnetlink_alloc_skb(net
, size
, queue
->peer_portid
,
359 skb_tx_error(entskb
);
363 nlh
= nlmsg_put(skb
, 0, 0,
364 NFNL_SUBSYS_QUEUE
<< 8 | NFQNL_MSG_PACKET
,
365 sizeof(struct nfgenmsg
), 0);
367 skb_tx_error(entskb
);
371 nfmsg
= nlmsg_data(nlh
);
372 nfmsg
->nfgen_family
= entry
->state
.pf
;
373 nfmsg
->version
= NFNETLINK_V0
;
374 nfmsg
->res_id
= htons(queue
->queue_num
);
376 nla
= __nla_reserve(skb
, NFQA_PACKET_HDR
, sizeof(*pmsg
));
377 pmsg
= nla_data(nla
);
378 pmsg
->hw_protocol
= entskb
->protocol
;
379 pmsg
->hook
= entry
->state
.hook
;
380 *packet_id_ptr
= &pmsg
->packet_id
;
382 indev
= entry
->state
.in
;
384 #if !IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
385 if (nla_put_be32(skb
, NFQA_IFINDEX_INDEV
, htonl(indev
->ifindex
)))
386 goto nla_put_failure
;
388 if (entry
->state
.pf
== PF_BRIDGE
) {
389 /* Case 1: indev is physical input device, we need to
390 * look for bridge group (when called from
391 * netfilter_bridge) */
392 if (nla_put_be32(skb
, NFQA_IFINDEX_PHYSINDEV
,
393 htonl(indev
->ifindex
)) ||
394 /* this is the bridge group "brX" */
395 /* rcu_read_lock()ed by __nf_queue */
396 nla_put_be32(skb
, NFQA_IFINDEX_INDEV
,
397 htonl(br_port_get_rcu(indev
)->br
->dev
->ifindex
)))
398 goto nla_put_failure
;
402 /* Case 2: indev is bridge group, we need to look for
403 * physical device (when called from ipv4) */
404 if (nla_put_be32(skb
, NFQA_IFINDEX_INDEV
,
405 htonl(indev
->ifindex
)))
406 goto nla_put_failure
;
408 physinif
= nf_bridge_get_physinif(entskb
);
410 nla_put_be32(skb
, NFQA_IFINDEX_PHYSINDEV
,
412 goto nla_put_failure
;
418 #if !IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
419 if (nla_put_be32(skb
, NFQA_IFINDEX_OUTDEV
, htonl(outdev
->ifindex
)))
420 goto nla_put_failure
;
422 if (entry
->state
.pf
== PF_BRIDGE
) {
423 /* Case 1: outdev is physical output device, we need to
424 * look for bridge group (when called from
425 * netfilter_bridge) */
426 if (nla_put_be32(skb
, NFQA_IFINDEX_PHYSOUTDEV
,
427 htonl(outdev
->ifindex
)) ||
428 /* this is the bridge group "brX" */
429 /* rcu_read_lock()ed by __nf_queue */
430 nla_put_be32(skb
, NFQA_IFINDEX_OUTDEV
,
431 htonl(br_port_get_rcu(outdev
)->br
->dev
->ifindex
)))
432 goto nla_put_failure
;
436 /* Case 2: outdev is bridge group, we need to look for
437 * physical output device (when called from ipv4) */
438 if (nla_put_be32(skb
, NFQA_IFINDEX_OUTDEV
,
439 htonl(outdev
->ifindex
)))
440 goto nla_put_failure
;
442 physoutif
= nf_bridge_get_physoutif(entskb
);
444 nla_put_be32(skb
, NFQA_IFINDEX_PHYSOUTDEV
,
446 goto nla_put_failure
;
452 nla_put_be32(skb
, NFQA_MARK
, htonl(entskb
->mark
)))
453 goto nla_put_failure
;
455 if (indev
&& entskb
->dev
&&
456 entskb
->mac_header
!= entskb
->network_header
) {
457 struct nfqnl_msg_packet_hw phw
;
460 memset(&phw
, 0, sizeof(phw
));
461 len
= dev_parse_header(entskb
, phw
.hw_addr
);
463 phw
.hw_addrlen
= htons(len
);
464 if (nla_put(skb
, NFQA_HWADDR
, sizeof(phw
), &phw
))
465 goto nla_put_failure
;
469 if (entskb
->tstamp
.tv64
) {
470 struct nfqnl_msg_packet_timestamp ts
;
471 struct timeval tv
= ktime_to_timeval(entskb
->tstamp
);
472 ts
.sec
= cpu_to_be64(tv
.tv_sec
);
473 ts
.usec
= cpu_to_be64(tv
.tv_usec
);
475 if (nla_put(skb
, NFQA_TIMESTAMP
, sizeof(ts
), &ts
))
476 goto nla_put_failure
;
479 if ((queue
->flags
& NFQA_CFG_F_UID_GID
) && entskb
->sk
&&
480 nfqnl_put_sk_uidgid(skb
, entskb
->sk
) < 0)
481 goto nla_put_failure
;
483 if (ct
&& nfqnl_ct_put(skb
, ct
, ctinfo
) < 0)
484 goto nla_put_failure
;
486 if (cap_len
> data_len
&&
487 nla_put_be32(skb
, NFQA_CAP_LEN
, htonl(cap_len
)))
488 goto nla_put_failure
;
490 if (nfqnl_put_packet_info(skb
, entskb
, csum_verify
))
491 goto nla_put_failure
;
496 if (skb_tailroom(skb
) < sizeof(*nla
) + hlen
)
497 goto nla_put_failure
;
499 nla
= (struct nlattr
*)skb_put(skb
, sizeof(*nla
));
500 nla
->nla_type
= NFQA_PAYLOAD
;
501 nla
->nla_len
= nla_attr_size(data_len
);
503 if (skb_zerocopy(skb
, entskb
, data_len
, hlen
))
504 goto nla_put_failure
;
507 nlh
->nlmsg_len
= skb
->len
;
511 skb_tx_error(entskb
);
513 net_err_ratelimited("nf_queue: error creating packet message\n");
518 __nfqnl_enqueue_packet(struct net
*net
, struct nfqnl_instance
*queue
,
519 struct nf_queue_entry
*entry
)
521 struct sk_buff
*nskb
;
523 __be32
*packet_id_ptr
;
526 nskb
= nfqnl_build_packet_message(net
, queue
, entry
, &packet_id_ptr
);
531 spin_lock_bh(&queue
->lock
);
533 if (queue
->queue_total
>= queue
->queue_maxlen
) {
534 if (queue
->flags
& NFQA_CFG_F_FAIL_OPEN
) {
538 queue
->queue_dropped
++;
539 net_warn_ratelimited("nf_queue: full at %d entries, dropping packets(s)\n",
542 goto err_out_free_nskb
;
544 entry
->id
= ++queue
->id_sequence
;
545 *packet_id_ptr
= htonl(entry
->id
);
547 /* nfnetlink_unicast will either free the nskb or add it to a socket */
548 err
= nfnetlink_unicast(nskb
, net
, queue
->peer_portid
, MSG_DONTWAIT
);
550 queue
->queue_user_dropped
++;
554 __enqueue_entry(queue
, entry
);
556 spin_unlock_bh(&queue
->lock
);
562 spin_unlock_bh(&queue
->lock
);
564 nf_reinject(entry
, NF_ACCEPT
);
569 static struct nf_queue_entry
*
570 nf_queue_entry_dup(struct nf_queue_entry
*e
)
572 struct nf_queue_entry
*entry
= kmemdup(e
, e
->size
, GFP_ATOMIC
);
574 if (nf_queue_entry_get_refs(entry
))
581 #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
582 /* When called from bridge netfilter, skb->data must point to MAC header
583 * before calling skb_gso_segment(). Else, original MAC header is lost
584 * and segmented skbs will be sent to wrong destination.
586 static void nf_bridge_adjust_skb_data(struct sk_buff
*skb
)
589 __skb_push(skb
, skb
->network_header
- skb
->mac_header
);
592 static void nf_bridge_adjust_segmented_data(struct sk_buff
*skb
)
595 __skb_pull(skb
, skb
->network_header
- skb
->mac_header
);
598 #define nf_bridge_adjust_skb_data(s) do {} while (0)
599 #define nf_bridge_adjust_segmented_data(s) do {} while (0)
602 static void free_entry(struct nf_queue_entry
*entry
)
604 nf_queue_entry_release_refs(entry
);
609 __nfqnl_enqueue_packet_gso(struct net
*net
, struct nfqnl_instance
*queue
,
610 struct sk_buff
*skb
, struct nf_queue_entry
*entry
)
613 struct nf_queue_entry
*entry_seg
;
615 nf_bridge_adjust_segmented_data(skb
);
617 if (skb
->next
== NULL
) { /* last packet, no need to copy entry */
618 struct sk_buff
*gso_skb
= entry
->skb
;
620 ret
= __nfqnl_enqueue_packet(net
, queue
, entry
);
622 entry
->skb
= gso_skb
;
628 entry_seg
= nf_queue_entry_dup(entry
);
630 entry_seg
->skb
= skb
;
631 ret
= __nfqnl_enqueue_packet(net
, queue
, entry_seg
);
633 free_entry(entry_seg
);
639 nfqnl_enqueue_packet(struct nf_queue_entry
*entry
, unsigned int queuenum
)
642 struct nfqnl_instance
*queue
;
643 struct sk_buff
*skb
, *segs
;
645 struct net
*net
= dev_net(entry
->state
.in
?
646 entry
->state
.in
: entry
->state
.out
);
647 struct nfnl_queue_net
*q
= nfnl_queue_pernet(net
);
649 /* rcu_read_lock()ed by nf_hook_slow() */
650 queue
= instance_lookup(q
, queuenum
);
654 if (queue
->copy_mode
== NFQNL_COPY_NONE
)
659 switch (entry
->state
.pf
) {
661 skb
->protocol
= htons(ETH_P_IP
);
664 skb
->protocol
= htons(ETH_P_IPV6
);
668 if ((queue
->flags
& NFQA_CFG_F_GSO
) || !skb_is_gso(skb
))
669 return __nfqnl_enqueue_packet(net
, queue
, entry
);
671 nf_bridge_adjust_skb_data(skb
);
672 segs
= skb_gso_segment(skb
, 0);
673 /* Does not use PTR_ERR to limit the number of error codes that can be
674 * returned by nf_queue. For instance, callers rely on -ECANCELED to
675 * mean 'ignore this hook'.
677 if (IS_ERR_OR_NULL(segs
))
682 struct sk_buff
*nskb
= segs
->next
;
684 err
= __nfqnl_enqueue_packet_gso(net
, queue
,
694 if (err
) /* some segments are already queued */
700 nf_bridge_adjust_segmented_data(skb
);
705 nfqnl_mangle(void *data
, int data_len
, struct nf_queue_entry
*e
, int diff
)
707 struct sk_buff
*nskb
;
710 if (pskb_trim(e
->skb
, data_len
))
712 } else if (diff
> 0) {
713 if (data_len
> 0xFFFF)
715 if (diff
> skb_tailroom(e
->skb
)) {
716 nskb
= skb_copy_expand(e
->skb
, skb_headroom(e
->skb
),
719 printk(KERN_WARNING
"nf_queue: OOM "
720 "in mangle, dropping packet\n");
726 skb_put(e
->skb
, diff
);
728 if (!skb_make_writable(e
->skb
, data_len
))
730 skb_copy_to_linear_data(e
->skb
, data
, data_len
);
731 e
->skb
->ip_summed
= CHECKSUM_NONE
;
736 nfqnl_set_mode(struct nfqnl_instance
*queue
,
737 unsigned char mode
, unsigned int range
)
741 spin_lock_bh(&queue
->lock
);
743 case NFQNL_COPY_NONE
:
744 case NFQNL_COPY_META
:
745 queue
->copy_mode
= mode
;
746 queue
->copy_range
= 0;
749 case NFQNL_COPY_PACKET
:
750 queue
->copy_mode
= mode
;
751 if (range
== 0 || range
> NFQNL_MAX_COPY_RANGE
)
752 queue
->copy_range
= NFQNL_MAX_COPY_RANGE
;
754 queue
->copy_range
= range
;
761 spin_unlock_bh(&queue
->lock
);
767 dev_cmp(struct nf_queue_entry
*entry
, unsigned long ifindex
)
770 if (entry
->state
.in
->ifindex
== ifindex
)
772 if (entry
->state
.out
)
773 if (entry
->state
.out
->ifindex
== ifindex
)
775 #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
776 if (entry
->skb
->nf_bridge
) {
777 int physinif
, physoutif
;
779 physinif
= nf_bridge_get_physinif(entry
->skb
);
780 physoutif
= nf_bridge_get_physoutif(entry
->skb
);
782 if (physinif
== ifindex
|| physoutif
== ifindex
)
789 /* drop all packets with either indev or outdev == ifindex from all queue
792 nfqnl_dev_drop(struct net
*net
, int ifindex
)
795 struct nfnl_queue_net
*q
= nfnl_queue_pernet(net
);
799 for (i
= 0; i
< INSTANCE_BUCKETS
; i
++) {
800 struct nfqnl_instance
*inst
;
801 struct hlist_head
*head
= &q
->instance_table
[i
];
803 hlist_for_each_entry_rcu(inst
, head
, hlist
)
804 nfqnl_flush(inst
, dev_cmp
, ifindex
);
810 #define RCV_SKB_FAIL(err) do { netlink_ack(skb, nlh, (err)); return; } while (0)
813 nfqnl_rcv_dev_event(struct notifier_block
*this,
814 unsigned long event
, void *ptr
)
816 struct net_device
*dev
= netdev_notifier_info_to_dev(ptr
);
818 /* Drop any packets associated with the downed device */
819 if (event
== NETDEV_DOWN
)
820 nfqnl_dev_drop(dev_net(dev
), dev
->ifindex
);
824 static struct notifier_block nfqnl_dev_notifier
= {
825 .notifier_call
= nfqnl_rcv_dev_event
,
829 nfqnl_rcv_nl_event(struct notifier_block
*this,
830 unsigned long event
, void *ptr
)
832 struct netlink_notify
*n
= ptr
;
833 struct nfnl_queue_net
*q
= nfnl_queue_pernet(n
->net
);
835 if (event
== NETLINK_URELEASE
&& n
->protocol
== NETLINK_NETFILTER
) {
838 /* destroy all instances for this portid */
839 spin_lock(&q
->instances_lock
);
840 for (i
= 0; i
< INSTANCE_BUCKETS
; i
++) {
841 struct hlist_node
*t2
;
842 struct nfqnl_instance
*inst
;
843 struct hlist_head
*head
= &q
->instance_table
[i
];
845 hlist_for_each_entry_safe(inst
, t2
, head
, hlist
) {
846 if (n
->portid
== inst
->peer_portid
)
847 __instance_destroy(inst
);
850 spin_unlock(&q
->instances_lock
);
855 static struct notifier_block nfqnl_rtnl_notifier
= {
856 .notifier_call
= nfqnl_rcv_nl_event
,
859 static const struct nla_policy nfqa_verdict_policy
[NFQA_MAX
+1] = {
860 [NFQA_VERDICT_HDR
] = { .len
= sizeof(struct nfqnl_msg_verdict_hdr
) },
861 [NFQA_MARK
] = { .type
= NLA_U32
},
862 [NFQA_PAYLOAD
] = { .type
= NLA_UNSPEC
},
863 [NFQA_CT
] = { .type
= NLA_UNSPEC
},
864 [NFQA_EXP
] = { .type
= NLA_UNSPEC
},
867 static const struct nla_policy nfqa_verdict_batch_policy
[NFQA_MAX
+1] = {
868 [NFQA_VERDICT_HDR
] = { .len
= sizeof(struct nfqnl_msg_verdict_hdr
) },
869 [NFQA_MARK
] = { .type
= NLA_U32
},
872 static struct nfqnl_instance
*
873 verdict_instance_lookup(struct nfnl_queue_net
*q
, u16 queue_num
, int nlportid
)
875 struct nfqnl_instance
*queue
;
877 queue
= instance_lookup(q
, queue_num
);
879 return ERR_PTR(-ENODEV
);
881 if (queue
->peer_portid
!= nlportid
)
882 return ERR_PTR(-EPERM
);
887 static struct nfqnl_msg_verdict_hdr
*
888 verdicthdr_get(const struct nlattr
* const nfqa
[])
890 struct nfqnl_msg_verdict_hdr
*vhdr
;
891 unsigned int verdict
;
893 if (!nfqa
[NFQA_VERDICT_HDR
])
896 vhdr
= nla_data(nfqa
[NFQA_VERDICT_HDR
]);
897 verdict
= ntohl(vhdr
->verdict
) & NF_VERDICT_MASK
;
898 if (verdict
> NF_MAX_VERDICT
|| verdict
== NF_STOLEN
)
903 static int nfq_id_after(unsigned int id
, unsigned int max
)
905 return (int)(id
- max
) > 0;
909 nfqnl_recv_verdict_batch(struct sock
*ctnl
, struct sk_buff
*skb
,
910 const struct nlmsghdr
*nlh
,
911 const struct nlattr
* const nfqa
[])
913 struct nfgenmsg
*nfmsg
= nlmsg_data(nlh
);
914 struct nf_queue_entry
*entry
, *tmp
;
915 unsigned int verdict
, maxid
;
916 struct nfqnl_msg_verdict_hdr
*vhdr
;
917 struct nfqnl_instance
*queue
;
918 LIST_HEAD(batch_list
);
919 u16 queue_num
= ntohs(nfmsg
->res_id
);
921 struct net
*net
= sock_net(ctnl
);
922 struct nfnl_queue_net
*q
= nfnl_queue_pernet(net
);
924 queue
= verdict_instance_lookup(q
, queue_num
,
925 NETLINK_CB(skb
).portid
);
927 return PTR_ERR(queue
);
929 vhdr
= verdicthdr_get(nfqa
);
933 verdict
= ntohl(vhdr
->verdict
);
934 maxid
= ntohl(vhdr
->id
);
936 spin_lock_bh(&queue
->lock
);
938 list_for_each_entry_safe(entry
, tmp
, &queue
->queue_list
, list
) {
939 if (nfq_id_after(entry
->id
, maxid
))
941 __dequeue_entry(queue
, entry
);
942 list_add_tail(&entry
->list
, &batch_list
);
945 spin_unlock_bh(&queue
->lock
);
947 if (list_empty(&batch_list
))
950 list_for_each_entry_safe(entry
, tmp
, &batch_list
, list
) {
952 entry
->skb
->mark
= ntohl(nla_get_be32(nfqa
[NFQA_MARK
]));
953 nf_reinject(entry
, verdict
);
959 nfqnl_recv_verdict(struct sock
*ctnl
, struct sk_buff
*skb
,
960 const struct nlmsghdr
*nlh
,
961 const struct nlattr
* const nfqa
[])
963 struct nfgenmsg
*nfmsg
= nlmsg_data(nlh
);
964 u_int16_t queue_num
= ntohs(nfmsg
->res_id
);
966 struct nfqnl_msg_verdict_hdr
*vhdr
;
967 struct nfqnl_instance
*queue
;
968 unsigned int verdict
;
969 struct nf_queue_entry
*entry
;
970 enum ip_conntrack_info
uninitialized_var(ctinfo
);
971 struct nf_conn
*ct
= NULL
;
973 struct net
*net
= sock_net(ctnl
);
974 struct nfnl_queue_net
*q
= nfnl_queue_pernet(net
);
976 queue
= instance_lookup(q
, queue_num
);
978 queue
= verdict_instance_lookup(q
, queue_num
,
979 NETLINK_CB(skb
).portid
);
981 return PTR_ERR(queue
);
983 vhdr
= verdicthdr_get(nfqa
);
987 verdict
= ntohl(vhdr
->verdict
);
989 entry
= find_dequeue_entry(queue
, ntohl(vhdr
->id
));
994 ct
= nfqnl_ct_parse(entry
->skb
, nfqa
[NFQA_CT
], &ctinfo
);
995 if (ct
&& nfqa
[NFQA_EXP
]) {
996 nfqnl_attach_expect(ct
, nfqa
[NFQA_EXP
],
997 NETLINK_CB(skb
).portid
,
1002 if (nfqa
[NFQA_PAYLOAD
]) {
1003 u16 payload_len
= nla_len(nfqa
[NFQA_PAYLOAD
]);
1004 int diff
= payload_len
- entry
->skb
->len
;
1006 if (nfqnl_mangle(nla_data(nfqa
[NFQA_PAYLOAD
]),
1007 payload_len
, entry
, diff
) < 0)
1011 nfqnl_ct_seq_adjust(entry
->skb
, ct
, ctinfo
, diff
);
1014 if (nfqa
[NFQA_MARK
])
1015 entry
->skb
->mark
= ntohl(nla_get_be32(nfqa
[NFQA_MARK
]));
1017 nf_reinject(entry
, verdict
);
1022 nfqnl_recv_unsupp(struct sock
*ctnl
, struct sk_buff
*skb
,
1023 const struct nlmsghdr
*nlh
,
1024 const struct nlattr
* const nfqa
[])
1029 static const struct nla_policy nfqa_cfg_policy
[NFQA_CFG_MAX
+1] = {
1030 [NFQA_CFG_CMD
] = { .len
= sizeof(struct nfqnl_msg_config_cmd
) },
1031 [NFQA_CFG_PARAMS
] = { .len
= sizeof(struct nfqnl_msg_config_params
) },
1034 static const struct nf_queue_handler nfqh
= {
1035 .outfn
= &nfqnl_enqueue_packet
,
1039 nfqnl_recv_config(struct sock
*ctnl
, struct sk_buff
*skb
,
1040 const struct nlmsghdr
*nlh
,
1041 const struct nlattr
* const nfqa
[])
1043 struct nfgenmsg
*nfmsg
= nlmsg_data(nlh
);
1044 u_int16_t queue_num
= ntohs(nfmsg
->res_id
);
1045 struct nfqnl_instance
*queue
;
1046 struct nfqnl_msg_config_cmd
*cmd
= NULL
;
1047 struct net
*net
= sock_net(ctnl
);
1048 struct nfnl_queue_net
*q
= nfnl_queue_pernet(net
);
1051 if (nfqa
[NFQA_CFG_CMD
]) {
1052 cmd
= nla_data(nfqa
[NFQA_CFG_CMD
]);
1054 /* Obsolete commands without queue context */
1055 switch (cmd
->command
) {
1056 case NFQNL_CFG_CMD_PF_BIND
: return 0;
1057 case NFQNL_CFG_CMD_PF_UNBIND
: return 0;
1062 queue
= instance_lookup(q
, queue_num
);
1063 if (queue
&& queue
->peer_portid
!= NETLINK_CB(skb
).portid
) {
1065 goto err_out_unlock
;
1069 switch (cmd
->command
) {
1070 case NFQNL_CFG_CMD_BIND
:
1073 goto err_out_unlock
;
1075 queue
= instance_create(q
, queue_num
,
1076 NETLINK_CB(skb
).portid
);
1077 if (IS_ERR(queue
)) {
1078 ret
= PTR_ERR(queue
);
1079 goto err_out_unlock
;
1082 case NFQNL_CFG_CMD_UNBIND
:
1085 goto err_out_unlock
;
1087 instance_destroy(q
, queue
);
1089 case NFQNL_CFG_CMD_PF_BIND
:
1090 case NFQNL_CFG_CMD_PF_UNBIND
:
1098 if (nfqa
[NFQA_CFG_PARAMS
]) {
1099 struct nfqnl_msg_config_params
*params
;
1103 goto err_out_unlock
;
1105 params
= nla_data(nfqa
[NFQA_CFG_PARAMS
]);
1106 nfqnl_set_mode(queue
, params
->copy_mode
,
1107 ntohl(params
->copy_range
));
1110 if (nfqa
[NFQA_CFG_QUEUE_MAXLEN
]) {
1111 __be32
*queue_maxlen
;
1115 goto err_out_unlock
;
1117 queue_maxlen
= nla_data(nfqa
[NFQA_CFG_QUEUE_MAXLEN
]);
1118 spin_lock_bh(&queue
->lock
);
1119 queue
->queue_maxlen
= ntohl(*queue_maxlen
);
1120 spin_unlock_bh(&queue
->lock
);
1123 if (nfqa
[NFQA_CFG_FLAGS
]) {
1128 goto err_out_unlock
;
1131 if (!nfqa
[NFQA_CFG_MASK
]) {
1132 /* A mask is needed to specify which flags are being
1136 goto err_out_unlock
;
1139 flags
= ntohl(nla_get_be32(nfqa
[NFQA_CFG_FLAGS
]));
1140 mask
= ntohl(nla_get_be32(nfqa
[NFQA_CFG_MASK
]));
1142 if (flags
>= NFQA_CFG_F_MAX
) {
1144 goto err_out_unlock
;
1147 spin_lock_bh(&queue
->lock
);
1148 queue
->flags
&= ~mask
;
1149 queue
->flags
|= flags
& mask
;
1150 spin_unlock_bh(&queue
->lock
);
1158 static const struct nfnl_callback nfqnl_cb
[NFQNL_MSG_MAX
] = {
1159 [NFQNL_MSG_PACKET
] = { .call_rcu
= nfqnl_recv_unsupp
,
1160 .attr_count
= NFQA_MAX
, },
1161 [NFQNL_MSG_VERDICT
] = { .call_rcu
= nfqnl_recv_verdict
,
1162 .attr_count
= NFQA_MAX
,
1163 .policy
= nfqa_verdict_policy
},
1164 [NFQNL_MSG_CONFIG
] = { .call
= nfqnl_recv_config
,
1165 .attr_count
= NFQA_CFG_MAX
,
1166 .policy
= nfqa_cfg_policy
},
1167 [NFQNL_MSG_VERDICT_BATCH
]={ .call_rcu
= nfqnl_recv_verdict_batch
,
1168 .attr_count
= NFQA_MAX
,
1169 .policy
= nfqa_verdict_batch_policy
},
1172 static const struct nfnetlink_subsystem nfqnl_subsys
= {
1174 .subsys_id
= NFNL_SUBSYS_QUEUE
,
1175 .cb_count
= NFQNL_MSG_MAX
,
1179 #ifdef CONFIG_PROC_FS
1181 struct seq_net_private p
;
1182 unsigned int bucket
;
1185 static struct hlist_node
*get_first(struct seq_file
*seq
)
1187 struct iter_state
*st
= seq
->private;
1189 struct nfnl_queue_net
*q
;
1194 net
= seq_file_net(seq
);
1195 q
= nfnl_queue_pernet(net
);
1196 for (st
->bucket
= 0; st
->bucket
< INSTANCE_BUCKETS
; st
->bucket
++) {
1197 if (!hlist_empty(&q
->instance_table
[st
->bucket
]))
1198 return q
->instance_table
[st
->bucket
].first
;
1203 static struct hlist_node
*get_next(struct seq_file
*seq
, struct hlist_node
*h
)
1205 struct iter_state
*st
= seq
->private;
1206 struct net
*net
= seq_file_net(seq
);
1210 struct nfnl_queue_net
*q
;
1212 if (++st
->bucket
>= INSTANCE_BUCKETS
)
1215 q
= nfnl_queue_pernet(net
);
1216 h
= q
->instance_table
[st
->bucket
].first
;
1221 static struct hlist_node
*get_idx(struct seq_file
*seq
, loff_t pos
)
1223 struct hlist_node
*head
;
1224 head
= get_first(seq
);
1227 while (pos
&& (head
= get_next(seq
, head
)))
1229 return pos
? NULL
: head
;
1232 static void *seq_start(struct seq_file
*s
, loff_t
*pos
)
1233 __acquires(nfnl_queue_pernet(seq_file_net(s
))->instances_lock
)
1235 spin_lock(&nfnl_queue_pernet(seq_file_net(s
))->instances_lock
);
1236 return get_idx(s
, *pos
);
1239 static void *seq_next(struct seq_file
*s
, void *v
, loff_t
*pos
)
1242 return get_next(s
, v
);
1245 static void seq_stop(struct seq_file
*s
, void *v
)
1246 __releases(nfnl_queue_pernet(seq_file_net(s
))->instances_lock
)
1248 spin_unlock(&nfnl_queue_pernet(seq_file_net(s
))->instances_lock
);
1251 static int seq_show(struct seq_file
*s
, void *v
)
1253 const struct nfqnl_instance
*inst
= v
;
1255 seq_printf(s
, "%5d %6d %5d %1d %5d %5d %5d %8d %2d\n",
1257 inst
->peer_portid
, inst
->queue_total
,
1258 inst
->copy_mode
, inst
->copy_range
,
1259 inst
->queue_dropped
, inst
->queue_user_dropped
,
1260 inst
->id_sequence
, 1);
1261 return seq_has_overflowed(s
);
1264 static const struct seq_operations nfqnl_seq_ops
= {
1271 static int nfqnl_open(struct inode
*inode
, struct file
*file
)
1273 return seq_open_net(inode
, file
, &nfqnl_seq_ops
,
1274 sizeof(struct iter_state
));
1277 static const struct file_operations nfqnl_file_ops
= {
1278 .owner
= THIS_MODULE
,
1281 .llseek
= seq_lseek
,
1282 .release
= seq_release_net
,
1285 #endif /* PROC_FS */
1287 static int __net_init
nfnl_queue_net_init(struct net
*net
)
1290 struct nfnl_queue_net
*q
= nfnl_queue_pernet(net
);
1292 for (i
= 0; i
< INSTANCE_BUCKETS
; i
++)
1293 INIT_HLIST_HEAD(&q
->instance_table
[i
]);
1295 spin_lock_init(&q
->instances_lock
);
1297 #ifdef CONFIG_PROC_FS
1298 if (!proc_create("nfnetlink_queue", 0440,
1299 net
->nf
.proc_netfilter
, &nfqnl_file_ops
))
1305 static void __net_exit
nfnl_queue_net_exit(struct net
*net
)
1307 #ifdef CONFIG_PROC_FS
1308 remove_proc_entry("nfnetlink_queue", net
->nf
.proc_netfilter
);
1312 static struct pernet_operations nfnl_queue_net_ops
= {
1313 .init
= nfnl_queue_net_init
,
1314 .exit
= nfnl_queue_net_exit
,
1315 .id
= &nfnl_queue_net_id
,
1316 .size
= sizeof(struct nfnl_queue_net
),
1319 static int __init
nfnetlink_queue_init(void)
1321 int status
= -ENOMEM
;
1323 netlink_register_notifier(&nfqnl_rtnl_notifier
);
1324 status
= nfnetlink_subsys_register(&nfqnl_subsys
);
1326 pr_err("nf_queue: failed to create netlink socket\n");
1327 goto cleanup_netlink_notifier
;
1330 status
= register_pernet_subsys(&nfnl_queue_net_ops
);
1332 pr_err("nf_queue: failed to register pernet ops\n");
1333 goto cleanup_subsys
;
1335 register_netdevice_notifier(&nfqnl_dev_notifier
);
1336 nf_register_queue_handler(&nfqh
);
1340 nfnetlink_subsys_unregister(&nfqnl_subsys
);
1341 cleanup_netlink_notifier
:
1342 netlink_unregister_notifier(&nfqnl_rtnl_notifier
);
1346 static void __exit
nfnetlink_queue_fini(void)
1348 nf_unregister_queue_handler();
1349 unregister_netdevice_notifier(&nfqnl_dev_notifier
);
1350 unregister_pernet_subsys(&nfnl_queue_net_ops
);
1351 nfnetlink_subsys_unregister(&nfqnl_subsys
);
1352 netlink_unregister_notifier(&nfqnl_rtnl_notifier
);
1354 rcu_barrier(); /* Wait for completion of call_rcu()'s */
1357 MODULE_DESCRIPTION("netfilter packet queue handler");
1358 MODULE_AUTHOR("Harald Welte <laforge@netfilter.org>");
1359 MODULE_LICENSE("GPL");
1360 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_QUEUE
);
1362 module_init(nfnetlink_queue_init
);
1363 module_exit(nfnetlink_queue_fini
);