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/nfnetlink.h>
29 #include <linux/netfilter/nfnetlink_queue.h>
30 #include <linux/list.h>
32 #include <net/netfilter/nf_queue.h>
33 #include <net/netns/generic.h>
34 #include <net/netfilter/nfnetlink_queue.h>
36 #include <linux/atomic.h>
38 #ifdef CONFIG_BRIDGE_NETFILTER
39 #include "../bridge/br_private.h"
42 #define NFQNL_QMAX_DEFAULT 1024
44 struct nfqnl_instance
{
45 struct hlist_node hlist
; /* global list of queues */
49 unsigned int queue_maxlen
;
50 unsigned int copy_range
;
51 unsigned int queue_dropped
;
52 unsigned int queue_user_dropped
;
55 u_int16_t queue_num
; /* number of this queue */
57 u_int32_t flags
; /* Set using NFQA_CFG_FLAGS */
59 * Following fields are dirtied for each queued packet,
60 * keep them in same cache line if possible.
63 unsigned int queue_total
;
64 unsigned int id_sequence
; /* 'sequence' of pkt ids */
65 struct list_head queue_list
; /* packets in queue */
68 typedef int (*nfqnl_cmpfn
)(struct nf_queue_entry
*, unsigned long);
70 static int nfnl_queue_net_id __read_mostly
;
72 #define INSTANCE_BUCKETS 16
73 struct nfnl_queue_net
{
74 spinlock_t instances_lock
;
75 struct hlist_head instance_table
[INSTANCE_BUCKETS
];
78 static struct nfnl_queue_net
*nfnl_queue_pernet(struct net
*net
)
80 return net_generic(net
, nfnl_queue_net_id
);
83 static inline u_int8_t
instance_hashfn(u_int16_t queue_num
)
85 return ((queue_num
>> 8) ^ queue_num
) % INSTANCE_BUCKETS
;
88 static struct nfqnl_instance
*
89 instance_lookup(struct nfnl_queue_net
*q
, u_int16_t queue_num
)
91 struct hlist_head
*head
;
92 struct nfqnl_instance
*inst
;
94 head
= &q
->instance_table
[instance_hashfn(queue_num
)];
95 hlist_for_each_entry_rcu(inst
, head
, hlist
) {
96 if (inst
->queue_num
== queue_num
)
102 static struct nfqnl_instance
*
103 instance_create(struct nfnl_queue_net
*q
, u_int16_t queue_num
,
106 struct nfqnl_instance
*inst
;
110 spin_lock(&q
->instances_lock
);
111 if (instance_lookup(q
, queue_num
)) {
116 inst
= kzalloc(sizeof(*inst
), GFP_ATOMIC
);
122 inst
->queue_num
= queue_num
;
123 inst
->peer_portid
= portid
;
124 inst
->queue_maxlen
= NFQNL_QMAX_DEFAULT
;
125 inst
->copy_range
= 0xffff;
126 inst
->copy_mode
= NFQNL_COPY_NONE
;
127 spin_lock_init(&inst
->lock
);
128 INIT_LIST_HEAD(&inst
->queue_list
);
130 if (!try_module_get(THIS_MODULE
)) {
135 h
= instance_hashfn(queue_num
);
136 hlist_add_head_rcu(&inst
->hlist
, &q
->instance_table
[h
]);
138 spin_unlock(&q
->instances_lock
);
145 spin_unlock(&q
->instances_lock
);
149 static void nfqnl_flush(struct nfqnl_instance
*queue
, nfqnl_cmpfn cmpfn
,
153 instance_destroy_rcu(struct rcu_head
*head
)
155 struct nfqnl_instance
*inst
= container_of(head
, struct nfqnl_instance
,
158 nfqnl_flush(inst
, NULL
, 0);
160 module_put(THIS_MODULE
);
164 __instance_destroy(struct nfqnl_instance
*inst
)
166 hlist_del_rcu(&inst
->hlist
);
167 call_rcu(&inst
->rcu
, instance_destroy_rcu
);
171 instance_destroy(struct nfnl_queue_net
*q
, struct nfqnl_instance
*inst
)
173 spin_lock(&q
->instances_lock
);
174 __instance_destroy(inst
);
175 spin_unlock(&q
->instances_lock
);
179 __enqueue_entry(struct nfqnl_instance
*queue
, struct nf_queue_entry
*entry
)
181 list_add_tail(&entry
->list
, &queue
->queue_list
);
182 queue
->queue_total
++;
186 __dequeue_entry(struct nfqnl_instance
*queue
, struct nf_queue_entry
*entry
)
188 list_del(&entry
->list
);
189 queue
->queue_total
--;
192 static struct nf_queue_entry
*
193 find_dequeue_entry(struct nfqnl_instance
*queue
, unsigned int id
)
195 struct nf_queue_entry
*entry
= NULL
, *i
;
197 spin_lock_bh(&queue
->lock
);
199 list_for_each_entry(i
, &queue
->queue_list
, list
) {
207 __dequeue_entry(queue
, entry
);
209 spin_unlock_bh(&queue
->lock
);
215 nfqnl_flush(struct nfqnl_instance
*queue
, nfqnl_cmpfn cmpfn
, unsigned long data
)
217 struct nf_queue_entry
*entry
, *next
;
219 spin_lock_bh(&queue
->lock
);
220 list_for_each_entry_safe(entry
, next
, &queue
->queue_list
, list
) {
221 if (!cmpfn
|| cmpfn(entry
, data
)) {
222 list_del(&entry
->list
);
223 queue
->queue_total
--;
224 nf_reinject(entry
, NF_DROP
);
227 spin_unlock_bh(&queue
->lock
);
231 nfqnl_zcopy(struct sk_buff
*to
, const struct sk_buff
*from
, int len
, int hlen
)
234 int plen
= 0; /* length of skb->head fragment */
238 /* dont bother with small payloads */
239 if (len
<= skb_tailroom(to
)) {
240 skb_copy_bits(from
, 0, skb_put(to
, len
), len
);
245 skb_copy_bits(from
, 0, skb_put(to
, hlen
), hlen
);
248 plen
= min_t(int, skb_headlen(from
), len
);
250 page
= virt_to_head_page(from
->head
);
251 offset
= from
->data
- (unsigned char *)page_address(page
);
252 __skb_fill_page_desc(to
, 0, page
, offset
, plen
);
259 to
->truesize
+= len
+ plen
;
260 to
->len
+= len
+ plen
;
261 to
->data_len
+= len
+ plen
;
263 for (i
= 0; i
< skb_shinfo(from
)->nr_frags
; i
++) {
266 skb_shinfo(to
)->frags
[j
] = skb_shinfo(from
)->frags
[i
];
267 skb_shinfo(to
)->frags
[j
].size
= min_t(int, skb_shinfo(to
)->frags
[j
].size
, len
);
268 len
-= skb_shinfo(to
)->frags
[j
].size
;
272 skb_shinfo(to
)->nr_frags
= j
;
275 static int nfqnl_put_packet_info(struct sk_buff
*nlskb
, struct sk_buff
*packet
)
279 if (packet
->ip_summed
== CHECKSUM_PARTIAL
)
280 flags
= NFQA_SKB_CSUMNOTREADY
;
281 if (skb_is_gso(packet
))
282 flags
|= NFQA_SKB_GSO
;
284 return flags
? nla_put_be32(nlskb
, NFQA_SKB_INFO
, htonl(flags
)) : 0;
287 static struct sk_buff
*
288 nfqnl_build_packet_message(struct nfqnl_instance
*queue
,
289 struct nf_queue_entry
*entry
,
290 __be32
**packet_id_ptr
)
293 size_t data_len
= 0, cap_len
= 0;
297 struct nfqnl_msg_packet_hdr
*pmsg
;
298 struct nlmsghdr
*nlh
;
299 struct nfgenmsg
*nfmsg
;
300 struct sk_buff
*entskb
= entry
->skb
;
301 struct net_device
*indev
;
302 struct net_device
*outdev
;
303 struct nf_conn
*ct
= NULL
;
304 enum ip_conntrack_info
uninitialized_var(ctinfo
);
306 size
= nlmsg_total_size(sizeof(struct nfgenmsg
))
307 + nla_total_size(sizeof(struct nfqnl_msg_packet_hdr
))
308 + nla_total_size(sizeof(u_int32_t
)) /* ifindex */
309 + nla_total_size(sizeof(u_int32_t
)) /* ifindex */
310 #ifdef CONFIG_BRIDGE_NETFILTER
311 + nla_total_size(sizeof(u_int32_t
)) /* ifindex */
312 + nla_total_size(sizeof(u_int32_t
)) /* ifindex */
314 + nla_total_size(sizeof(u_int32_t
)) /* mark */
315 + nla_total_size(sizeof(struct nfqnl_msg_packet_hw
))
316 + nla_total_size(sizeof(u_int32_t
)) /* skbinfo */
317 + nla_total_size(sizeof(u_int32_t
)); /* cap_len */
319 if (entskb
->tstamp
.tv64
)
320 size
+= nla_total_size(sizeof(struct nfqnl_msg_packet_timestamp
));
322 outdev
= entry
->outdev
;
324 switch ((enum nfqnl_config_mode
)ACCESS_ONCE(queue
->copy_mode
)) {
325 case NFQNL_COPY_META
:
326 case NFQNL_COPY_NONE
:
329 case NFQNL_COPY_PACKET
:
330 if (!(queue
->flags
& NFQA_CFG_F_GSO
) &&
331 entskb
->ip_summed
== CHECKSUM_PARTIAL
&&
332 skb_checksum_help(entskb
))
335 data_len
= ACCESS_ONCE(queue
->copy_range
);
336 if (data_len
== 0 || data_len
> entskb
->len
)
337 data_len
= entskb
->len
;
340 if (!entskb
->head_frag
||
341 skb_headlen(entskb
) < L1_CACHE_BYTES
||
342 skb_shinfo(entskb
)->nr_frags
>= MAX_SKB_FRAGS
)
343 hlen
= skb_headlen(entskb
);
345 if (skb_has_frag_list(entskb
))
347 hlen
= min_t(int, data_len
, hlen
);
348 size
+= sizeof(struct nlattr
) + hlen
;
349 cap_len
= entskb
->len
;
353 if (queue
->flags
& NFQA_CFG_F_CONNTRACK
)
354 ct
= nfqnl_ct_get(entskb
, &size
, &ctinfo
);
356 skb
= nfnetlink_alloc_skb(&init_net
, size
, queue
->peer_portid
,
361 nlh
= nlmsg_put(skb
, 0, 0,
362 NFNL_SUBSYS_QUEUE
<< 8 | NFQNL_MSG_PACKET
,
363 sizeof(struct nfgenmsg
), 0);
368 nfmsg
= nlmsg_data(nlh
);
369 nfmsg
->nfgen_family
= entry
->pf
;
370 nfmsg
->version
= NFNETLINK_V0
;
371 nfmsg
->res_id
= htons(queue
->queue_num
);
373 nla
= __nla_reserve(skb
, NFQA_PACKET_HDR
, sizeof(*pmsg
));
374 pmsg
= nla_data(nla
);
375 pmsg
->hw_protocol
= entskb
->protocol
;
376 pmsg
->hook
= entry
->hook
;
377 *packet_id_ptr
= &pmsg
->packet_id
;
379 indev
= entry
->indev
;
381 #ifndef CONFIG_BRIDGE_NETFILTER
382 if (nla_put_be32(skb
, NFQA_IFINDEX_INDEV
, htonl(indev
->ifindex
)))
383 goto nla_put_failure
;
385 if (entry
->pf
== PF_BRIDGE
) {
386 /* Case 1: indev is physical input device, we need to
387 * look for bridge group (when called from
388 * netfilter_bridge) */
389 if (nla_put_be32(skb
, NFQA_IFINDEX_PHYSINDEV
,
390 htonl(indev
->ifindex
)) ||
391 /* this is the bridge group "brX" */
392 /* rcu_read_lock()ed by __nf_queue */
393 nla_put_be32(skb
, NFQA_IFINDEX_INDEV
,
394 htonl(br_port_get_rcu(indev
)->br
->dev
->ifindex
)))
395 goto nla_put_failure
;
397 /* Case 2: indev is bridge group, we need to look for
398 * physical device (when called from ipv4) */
399 if (nla_put_be32(skb
, NFQA_IFINDEX_INDEV
,
400 htonl(indev
->ifindex
)))
401 goto nla_put_failure
;
402 if (entskb
->nf_bridge
&& entskb
->nf_bridge
->physindev
&&
403 nla_put_be32(skb
, NFQA_IFINDEX_PHYSINDEV
,
404 htonl(entskb
->nf_bridge
->physindev
->ifindex
)))
405 goto nla_put_failure
;
411 #ifndef CONFIG_BRIDGE_NETFILTER
412 if (nla_put_be32(skb
, NFQA_IFINDEX_OUTDEV
, htonl(outdev
->ifindex
)))
413 goto nla_put_failure
;
415 if (entry
->pf
== PF_BRIDGE
) {
416 /* Case 1: outdev is physical output device, we need to
417 * look for bridge group (when called from
418 * netfilter_bridge) */
419 if (nla_put_be32(skb
, NFQA_IFINDEX_PHYSOUTDEV
,
420 htonl(outdev
->ifindex
)) ||
421 /* this is the bridge group "brX" */
422 /* rcu_read_lock()ed by __nf_queue */
423 nla_put_be32(skb
, NFQA_IFINDEX_OUTDEV
,
424 htonl(br_port_get_rcu(outdev
)->br
->dev
->ifindex
)))
425 goto nla_put_failure
;
427 /* Case 2: outdev is bridge group, we need to look for
428 * physical output device (when called from ipv4) */
429 if (nla_put_be32(skb
, NFQA_IFINDEX_OUTDEV
,
430 htonl(outdev
->ifindex
)))
431 goto nla_put_failure
;
432 if (entskb
->nf_bridge
&& entskb
->nf_bridge
->physoutdev
&&
433 nla_put_be32(skb
, NFQA_IFINDEX_PHYSOUTDEV
,
434 htonl(entskb
->nf_bridge
->physoutdev
->ifindex
)))
435 goto nla_put_failure
;
441 nla_put_be32(skb
, NFQA_MARK
, htonl(entskb
->mark
)))
442 goto nla_put_failure
;
444 if (indev
&& entskb
->dev
&&
445 entskb
->mac_header
!= entskb
->network_header
) {
446 struct nfqnl_msg_packet_hw phw
;
447 int len
= dev_parse_header(entskb
, phw
.hw_addr
);
449 phw
.hw_addrlen
= htons(len
);
450 if (nla_put(skb
, NFQA_HWADDR
, sizeof(phw
), &phw
))
451 goto nla_put_failure
;
455 if (entskb
->tstamp
.tv64
) {
456 struct nfqnl_msg_packet_timestamp ts
;
457 struct timeval tv
= ktime_to_timeval(entskb
->tstamp
);
458 ts
.sec
= cpu_to_be64(tv
.tv_sec
);
459 ts
.usec
= cpu_to_be64(tv
.tv_usec
);
461 if (nla_put(skb
, NFQA_TIMESTAMP
, sizeof(ts
), &ts
))
462 goto nla_put_failure
;
465 if (ct
&& nfqnl_ct_put(skb
, ct
, ctinfo
) < 0)
466 goto nla_put_failure
;
468 if (cap_len
> 0 && nla_put_be32(skb
, NFQA_CAP_LEN
, htonl(cap_len
)))
469 goto nla_put_failure
;
471 if (nfqnl_put_packet_info(skb
, entskb
))
472 goto nla_put_failure
;
477 if (skb_tailroom(skb
) < sizeof(*nla
) + hlen
)
478 goto nla_put_failure
;
480 nla
= (struct nlattr
*)skb_put(skb
, sizeof(*nla
));
481 nla
->nla_type
= NFQA_PAYLOAD
;
482 nla
->nla_len
= nla_attr_size(data_len
);
484 nfqnl_zcopy(skb
, entskb
, data_len
, hlen
);
487 nlh
->nlmsg_len
= skb
->len
;
492 net_err_ratelimited("nf_queue: error creating packet message\n");
497 __nfqnl_enqueue_packet(struct net
*net
, struct nfqnl_instance
*queue
,
498 struct nf_queue_entry
*entry
)
500 struct sk_buff
*nskb
;
502 __be32
*packet_id_ptr
;
505 nskb
= nfqnl_build_packet_message(queue
, entry
, &packet_id_ptr
);
510 spin_lock_bh(&queue
->lock
);
512 if (!queue
->peer_portid
) {
514 goto err_out_free_nskb
;
516 if (queue
->queue_total
>= queue
->queue_maxlen
) {
517 if (queue
->flags
& NFQA_CFG_F_FAIL_OPEN
) {
521 queue
->queue_dropped
++;
522 net_warn_ratelimited("nf_queue: full at %d entries, dropping packets(s)\n",
525 goto err_out_free_nskb
;
527 entry
->id
= ++queue
->id_sequence
;
528 *packet_id_ptr
= htonl(entry
->id
);
530 /* nfnetlink_unicast will either free the nskb or add it to a socket */
531 err
= nfnetlink_unicast(nskb
, net
, queue
->peer_portid
, MSG_DONTWAIT
);
533 queue
->queue_user_dropped
++;
537 __enqueue_entry(queue
, entry
);
539 spin_unlock_bh(&queue
->lock
);
545 spin_unlock_bh(&queue
->lock
);
547 nf_reinject(entry
, NF_ACCEPT
);
552 static struct nf_queue_entry
*
553 nf_queue_entry_dup(struct nf_queue_entry
*e
)
555 struct nf_queue_entry
*entry
= kmemdup(e
, e
->size
, GFP_ATOMIC
);
557 if (nf_queue_entry_get_refs(entry
))
564 #ifdef CONFIG_BRIDGE_NETFILTER
565 /* When called from bridge netfilter, skb->data must point to MAC header
566 * before calling skb_gso_segment(). Else, original MAC header is lost
567 * and segmented skbs will be sent to wrong destination.
569 static void nf_bridge_adjust_skb_data(struct sk_buff
*skb
)
572 __skb_push(skb
, skb
->network_header
- skb
->mac_header
);
575 static void nf_bridge_adjust_segmented_data(struct sk_buff
*skb
)
578 __skb_pull(skb
, skb
->network_header
- skb
->mac_header
);
581 #define nf_bridge_adjust_skb_data(s) do {} while (0)
582 #define nf_bridge_adjust_segmented_data(s) do {} while (0)
585 static void free_entry(struct nf_queue_entry
*entry
)
587 nf_queue_entry_release_refs(entry
);
592 __nfqnl_enqueue_packet_gso(struct net
*net
, struct nfqnl_instance
*queue
,
593 struct sk_buff
*skb
, struct nf_queue_entry
*entry
)
596 struct nf_queue_entry
*entry_seg
;
598 nf_bridge_adjust_segmented_data(skb
);
600 if (skb
->next
== NULL
) { /* last packet, no need to copy entry */
601 struct sk_buff
*gso_skb
= entry
->skb
;
603 ret
= __nfqnl_enqueue_packet(net
, queue
, entry
);
605 entry
->skb
= gso_skb
;
611 entry_seg
= nf_queue_entry_dup(entry
);
613 entry_seg
->skb
= skb
;
614 ret
= __nfqnl_enqueue_packet(net
, queue
, entry_seg
);
616 free_entry(entry_seg
);
622 nfqnl_enqueue_packet(struct nf_queue_entry
*entry
, unsigned int queuenum
)
625 struct nfqnl_instance
*queue
;
626 struct sk_buff
*skb
, *segs
;
628 struct net
*net
= dev_net(entry
->indev
?
629 entry
->indev
: entry
->outdev
);
630 struct nfnl_queue_net
*q
= nfnl_queue_pernet(net
);
632 /* rcu_read_lock()ed by nf_hook_slow() */
633 queue
= instance_lookup(q
, queuenum
);
637 if (queue
->copy_mode
== NFQNL_COPY_NONE
)
640 if ((queue
->flags
& NFQA_CFG_F_GSO
) || !skb_is_gso(entry
->skb
))
641 return __nfqnl_enqueue_packet(net
, queue
, entry
);
647 skb
->protocol
= htons(ETH_P_IP
);
650 skb
->protocol
= htons(ETH_P_IPV6
);
654 nf_bridge_adjust_skb_data(skb
);
655 segs
= skb_gso_segment(skb
, 0);
656 /* Does not use PTR_ERR to limit the number of error codes that can be
657 * returned by nf_queue. For instance, callers rely on -ECANCELED to
658 * mean 'ignore this hook'.
665 struct sk_buff
*nskb
= segs
->next
;
667 err
= __nfqnl_enqueue_packet_gso(net
, queue
,
677 if (err
) /* some segments are already queued */
683 nf_bridge_adjust_segmented_data(skb
);
688 nfqnl_mangle(void *data
, int data_len
, struct nf_queue_entry
*e
, int diff
)
690 struct sk_buff
*nskb
;
693 if (pskb_trim(e
->skb
, data_len
))
695 } else if (diff
> 0) {
696 if (data_len
> 0xFFFF)
698 if (diff
> skb_tailroom(e
->skb
)) {
699 nskb
= skb_copy_expand(e
->skb
, skb_headroom(e
->skb
),
702 printk(KERN_WARNING
"nf_queue: OOM "
703 "in mangle, dropping packet\n");
709 skb_put(e
->skb
, diff
);
711 if (!skb_make_writable(e
->skb
, data_len
))
713 skb_copy_to_linear_data(e
->skb
, data
, data_len
);
714 e
->skb
->ip_summed
= CHECKSUM_NONE
;
719 nfqnl_set_mode(struct nfqnl_instance
*queue
,
720 unsigned char mode
, unsigned int range
)
724 spin_lock_bh(&queue
->lock
);
726 case NFQNL_COPY_NONE
:
727 case NFQNL_COPY_META
:
728 queue
->copy_mode
= mode
;
729 queue
->copy_range
= 0;
732 case NFQNL_COPY_PACKET
:
733 queue
->copy_mode
= mode
;
734 /* We're using struct nlattr which has 16bit nla_len. Note that
735 * nla_len includes the header length. Thus, the maximum packet
736 * length that we support is 65531 bytes. We send truncated
737 * packets if the specified length is larger than that.
739 if (range
> 0xffff - NLA_HDRLEN
)
740 queue
->copy_range
= 0xffff - NLA_HDRLEN
;
742 queue
->copy_range
= range
;
749 spin_unlock_bh(&queue
->lock
);
755 dev_cmp(struct nf_queue_entry
*entry
, unsigned long ifindex
)
758 if (entry
->indev
->ifindex
== ifindex
)
761 if (entry
->outdev
->ifindex
== ifindex
)
763 #ifdef CONFIG_BRIDGE_NETFILTER
764 if (entry
->skb
->nf_bridge
) {
765 if (entry
->skb
->nf_bridge
->physindev
&&
766 entry
->skb
->nf_bridge
->physindev
->ifindex
== ifindex
)
768 if (entry
->skb
->nf_bridge
->physoutdev
&&
769 entry
->skb
->nf_bridge
->physoutdev
->ifindex
== ifindex
)
776 /* drop all packets with either indev or outdev == ifindex from all queue
779 nfqnl_dev_drop(struct net
*net
, int ifindex
)
782 struct nfnl_queue_net
*q
= nfnl_queue_pernet(net
);
786 for (i
= 0; i
< INSTANCE_BUCKETS
; i
++) {
787 struct nfqnl_instance
*inst
;
788 struct hlist_head
*head
= &q
->instance_table
[i
];
790 hlist_for_each_entry_rcu(inst
, head
, hlist
)
791 nfqnl_flush(inst
, dev_cmp
, ifindex
);
797 #define RCV_SKB_FAIL(err) do { netlink_ack(skb, nlh, (err)); return; } while (0)
800 nfqnl_rcv_dev_event(struct notifier_block
*this,
801 unsigned long event
, void *ptr
)
803 struct net_device
*dev
= ptr
;
805 /* Drop any packets associated with the downed device */
806 if (event
== NETDEV_DOWN
)
807 nfqnl_dev_drop(dev_net(dev
), dev
->ifindex
);
811 static struct notifier_block nfqnl_dev_notifier
= {
812 .notifier_call
= nfqnl_rcv_dev_event
,
816 nfqnl_rcv_nl_event(struct notifier_block
*this,
817 unsigned long event
, void *ptr
)
819 struct netlink_notify
*n
= ptr
;
820 struct nfnl_queue_net
*q
= nfnl_queue_pernet(n
->net
);
822 if (event
== NETLINK_URELEASE
&& n
->protocol
== NETLINK_NETFILTER
) {
825 /* destroy all instances for this portid */
826 spin_lock(&q
->instances_lock
);
827 for (i
= 0; i
< INSTANCE_BUCKETS
; i
++) {
828 struct hlist_node
*t2
;
829 struct nfqnl_instance
*inst
;
830 struct hlist_head
*head
= &q
->instance_table
[i
];
832 hlist_for_each_entry_safe(inst
, t2
, head
, hlist
) {
833 if (n
->portid
== inst
->peer_portid
)
834 __instance_destroy(inst
);
837 spin_unlock(&q
->instances_lock
);
842 static struct notifier_block nfqnl_rtnl_notifier
= {
843 .notifier_call
= nfqnl_rcv_nl_event
,
846 static const struct nla_policy nfqa_verdict_policy
[NFQA_MAX
+1] = {
847 [NFQA_VERDICT_HDR
] = { .len
= sizeof(struct nfqnl_msg_verdict_hdr
) },
848 [NFQA_MARK
] = { .type
= NLA_U32
},
849 [NFQA_PAYLOAD
] = { .type
= NLA_UNSPEC
},
850 [NFQA_CT
] = { .type
= NLA_UNSPEC
},
853 static const struct nla_policy nfqa_verdict_batch_policy
[NFQA_MAX
+1] = {
854 [NFQA_VERDICT_HDR
] = { .len
= sizeof(struct nfqnl_msg_verdict_hdr
) },
855 [NFQA_MARK
] = { .type
= NLA_U32
},
858 static struct nfqnl_instance
*
859 verdict_instance_lookup(struct nfnl_queue_net
*q
, u16 queue_num
, int nlportid
)
861 struct nfqnl_instance
*queue
;
863 queue
= instance_lookup(q
, queue_num
);
865 return ERR_PTR(-ENODEV
);
867 if (queue
->peer_portid
!= nlportid
)
868 return ERR_PTR(-EPERM
);
873 static struct nfqnl_msg_verdict_hdr
*
874 verdicthdr_get(const struct nlattr
* const nfqa
[])
876 struct nfqnl_msg_verdict_hdr
*vhdr
;
877 unsigned int verdict
;
879 if (!nfqa
[NFQA_VERDICT_HDR
])
882 vhdr
= nla_data(nfqa
[NFQA_VERDICT_HDR
]);
883 verdict
= ntohl(vhdr
->verdict
) & NF_VERDICT_MASK
;
884 if (verdict
> NF_MAX_VERDICT
|| verdict
== NF_STOLEN
)
889 static int nfq_id_after(unsigned int id
, unsigned int max
)
891 return (int)(id
- max
) > 0;
895 nfqnl_recv_verdict_batch(struct sock
*ctnl
, struct sk_buff
*skb
,
896 const struct nlmsghdr
*nlh
,
897 const struct nlattr
* const nfqa
[])
899 struct nfgenmsg
*nfmsg
= nlmsg_data(nlh
);
900 struct nf_queue_entry
*entry
, *tmp
;
901 unsigned int verdict
, maxid
;
902 struct nfqnl_msg_verdict_hdr
*vhdr
;
903 struct nfqnl_instance
*queue
;
904 LIST_HEAD(batch_list
);
905 u16 queue_num
= ntohs(nfmsg
->res_id
);
907 struct net
*net
= sock_net(ctnl
);
908 struct nfnl_queue_net
*q
= nfnl_queue_pernet(net
);
910 queue
= verdict_instance_lookup(q
, queue_num
,
911 NETLINK_CB(skb
).portid
);
913 return PTR_ERR(queue
);
915 vhdr
= verdicthdr_get(nfqa
);
919 verdict
= ntohl(vhdr
->verdict
);
920 maxid
= ntohl(vhdr
->id
);
922 spin_lock_bh(&queue
->lock
);
924 list_for_each_entry_safe(entry
, tmp
, &queue
->queue_list
, list
) {
925 if (nfq_id_after(entry
->id
, maxid
))
927 __dequeue_entry(queue
, entry
);
928 list_add_tail(&entry
->list
, &batch_list
);
931 spin_unlock_bh(&queue
->lock
);
933 if (list_empty(&batch_list
))
936 list_for_each_entry_safe(entry
, tmp
, &batch_list
, list
) {
938 entry
->skb
->mark
= ntohl(nla_get_be32(nfqa
[NFQA_MARK
]));
939 nf_reinject(entry
, verdict
);
945 nfqnl_recv_verdict(struct sock
*ctnl
, struct sk_buff
*skb
,
946 const struct nlmsghdr
*nlh
,
947 const struct nlattr
* const nfqa
[])
949 struct nfgenmsg
*nfmsg
= nlmsg_data(nlh
);
950 u_int16_t queue_num
= ntohs(nfmsg
->res_id
);
952 struct nfqnl_msg_verdict_hdr
*vhdr
;
953 struct nfqnl_instance
*queue
;
954 unsigned int verdict
;
955 struct nf_queue_entry
*entry
;
956 enum ip_conntrack_info
uninitialized_var(ctinfo
);
957 struct nf_conn
*ct
= NULL
;
959 struct net
*net
= sock_net(ctnl
);
960 struct nfnl_queue_net
*q
= nfnl_queue_pernet(net
);
962 queue
= instance_lookup(q
, queue_num
);
964 queue
= verdict_instance_lookup(q
, queue_num
,
965 NETLINK_CB(skb
).portid
);
967 return PTR_ERR(queue
);
969 vhdr
= verdicthdr_get(nfqa
);
973 verdict
= ntohl(vhdr
->verdict
);
975 entry
= find_dequeue_entry(queue
, ntohl(vhdr
->id
));
980 if (nfqa
[NFQA_CT
] && (queue
->flags
& NFQA_CFG_F_CONNTRACK
))
981 ct
= nfqnl_ct_parse(entry
->skb
, nfqa
[NFQA_CT
], &ctinfo
);
983 if (nfqa
[NFQA_PAYLOAD
]) {
984 u16 payload_len
= nla_len(nfqa
[NFQA_PAYLOAD
]);
985 int diff
= payload_len
- entry
->skb
->len
;
987 if (nfqnl_mangle(nla_data(nfqa
[NFQA_PAYLOAD
]),
988 payload_len
, entry
, diff
) < 0)
992 nfqnl_ct_seq_adjust(skb
, ct
, ctinfo
, diff
);
997 entry
->skb
->mark
= ntohl(nla_get_be32(nfqa
[NFQA_MARK
]));
999 nf_reinject(entry
, verdict
);
1004 nfqnl_recv_unsupp(struct sock
*ctnl
, struct sk_buff
*skb
,
1005 const struct nlmsghdr
*nlh
,
1006 const struct nlattr
* const nfqa
[])
1011 static const struct nla_policy nfqa_cfg_policy
[NFQA_CFG_MAX
+1] = {
1012 [NFQA_CFG_CMD
] = { .len
= sizeof(struct nfqnl_msg_config_cmd
) },
1013 [NFQA_CFG_PARAMS
] = { .len
= sizeof(struct nfqnl_msg_config_params
) },
1016 static const struct nf_queue_handler nfqh
= {
1017 .outfn
= &nfqnl_enqueue_packet
,
1021 nfqnl_recv_config(struct sock
*ctnl
, struct sk_buff
*skb
,
1022 const struct nlmsghdr
*nlh
,
1023 const struct nlattr
* const nfqa
[])
1025 struct nfgenmsg
*nfmsg
= nlmsg_data(nlh
);
1026 u_int16_t queue_num
= ntohs(nfmsg
->res_id
);
1027 struct nfqnl_instance
*queue
;
1028 struct nfqnl_msg_config_cmd
*cmd
= NULL
;
1029 struct net
*net
= sock_net(ctnl
);
1030 struct nfnl_queue_net
*q
= nfnl_queue_pernet(net
);
1033 if (nfqa
[NFQA_CFG_CMD
]) {
1034 cmd
= nla_data(nfqa
[NFQA_CFG_CMD
]);
1036 /* Obsolete commands without queue context */
1037 switch (cmd
->command
) {
1038 case NFQNL_CFG_CMD_PF_BIND
: return 0;
1039 case NFQNL_CFG_CMD_PF_UNBIND
: return 0;
1044 queue
= instance_lookup(q
, queue_num
);
1045 if (queue
&& queue
->peer_portid
!= NETLINK_CB(skb
).portid
) {
1047 goto err_out_unlock
;
1051 switch (cmd
->command
) {
1052 case NFQNL_CFG_CMD_BIND
:
1055 goto err_out_unlock
;
1057 queue
= instance_create(q
, queue_num
,
1058 NETLINK_CB(skb
).portid
);
1059 if (IS_ERR(queue
)) {
1060 ret
= PTR_ERR(queue
);
1061 goto err_out_unlock
;
1064 case NFQNL_CFG_CMD_UNBIND
:
1067 goto err_out_unlock
;
1069 instance_destroy(q
, queue
);
1071 case NFQNL_CFG_CMD_PF_BIND
:
1072 case NFQNL_CFG_CMD_PF_UNBIND
:
1080 if (nfqa
[NFQA_CFG_PARAMS
]) {
1081 struct nfqnl_msg_config_params
*params
;
1085 goto err_out_unlock
;
1087 params
= nla_data(nfqa
[NFQA_CFG_PARAMS
]);
1088 nfqnl_set_mode(queue
, params
->copy_mode
,
1089 ntohl(params
->copy_range
));
1092 if (nfqa
[NFQA_CFG_QUEUE_MAXLEN
]) {
1093 __be32
*queue_maxlen
;
1097 goto err_out_unlock
;
1099 queue_maxlen
= nla_data(nfqa
[NFQA_CFG_QUEUE_MAXLEN
]);
1100 spin_lock_bh(&queue
->lock
);
1101 queue
->queue_maxlen
= ntohl(*queue_maxlen
);
1102 spin_unlock_bh(&queue
->lock
);
1105 if (nfqa
[NFQA_CFG_FLAGS
]) {
1110 goto err_out_unlock
;
1113 if (!nfqa
[NFQA_CFG_MASK
]) {
1114 /* A mask is needed to specify which flags are being
1118 goto err_out_unlock
;
1121 flags
= ntohl(nla_get_be32(nfqa
[NFQA_CFG_FLAGS
]));
1122 mask
= ntohl(nla_get_be32(nfqa
[NFQA_CFG_MASK
]));
1124 if (flags
>= NFQA_CFG_F_MAX
) {
1126 goto err_out_unlock
;
1129 spin_lock_bh(&queue
->lock
);
1130 queue
->flags
&= ~mask
;
1131 queue
->flags
|= flags
& mask
;
1132 spin_unlock_bh(&queue
->lock
);
1140 static const struct nfnl_callback nfqnl_cb
[NFQNL_MSG_MAX
] = {
1141 [NFQNL_MSG_PACKET
] = { .call_rcu
= nfqnl_recv_unsupp
,
1142 .attr_count
= NFQA_MAX
, },
1143 [NFQNL_MSG_VERDICT
] = { .call_rcu
= nfqnl_recv_verdict
,
1144 .attr_count
= NFQA_MAX
,
1145 .policy
= nfqa_verdict_policy
},
1146 [NFQNL_MSG_CONFIG
] = { .call
= nfqnl_recv_config
,
1147 .attr_count
= NFQA_CFG_MAX
,
1148 .policy
= nfqa_cfg_policy
},
1149 [NFQNL_MSG_VERDICT_BATCH
]={ .call_rcu
= nfqnl_recv_verdict_batch
,
1150 .attr_count
= NFQA_MAX
,
1151 .policy
= nfqa_verdict_batch_policy
},
1154 static const struct nfnetlink_subsystem nfqnl_subsys
= {
1156 .subsys_id
= NFNL_SUBSYS_QUEUE
,
1157 .cb_count
= NFQNL_MSG_MAX
,
1161 #ifdef CONFIG_PROC_FS
1163 struct seq_net_private p
;
1164 unsigned int bucket
;
1167 static struct hlist_node
*get_first(struct seq_file
*seq
)
1169 struct iter_state
*st
= seq
->private;
1171 struct nfnl_queue_net
*q
;
1176 net
= seq_file_net(seq
);
1177 q
= nfnl_queue_pernet(net
);
1178 for (st
->bucket
= 0; st
->bucket
< INSTANCE_BUCKETS
; st
->bucket
++) {
1179 if (!hlist_empty(&q
->instance_table
[st
->bucket
]))
1180 return q
->instance_table
[st
->bucket
].first
;
1185 static struct hlist_node
*get_next(struct seq_file
*seq
, struct hlist_node
*h
)
1187 struct iter_state
*st
= seq
->private;
1188 struct net
*net
= seq_file_net(seq
);
1192 struct nfnl_queue_net
*q
;
1194 if (++st
->bucket
>= INSTANCE_BUCKETS
)
1197 q
= nfnl_queue_pernet(net
);
1198 h
= q
->instance_table
[st
->bucket
].first
;
1203 static struct hlist_node
*get_idx(struct seq_file
*seq
, loff_t pos
)
1205 struct hlist_node
*head
;
1206 head
= get_first(seq
);
1209 while (pos
&& (head
= get_next(seq
, head
)))
1211 return pos
? NULL
: head
;
1214 static void *seq_start(struct seq_file
*s
, loff_t
*pos
)
1215 __acquires(nfnl_queue_pernet(seq_file_net(s
))->instances_lock
)
1217 spin_lock(&nfnl_queue_pernet(seq_file_net(s
))->instances_lock
);
1218 return get_idx(s
, *pos
);
1221 static void *seq_next(struct seq_file
*s
, void *v
, loff_t
*pos
)
1224 return get_next(s
, v
);
1227 static void seq_stop(struct seq_file
*s
, void *v
)
1228 __releases(nfnl_queue_pernet(seq_file_net(s
))->instances_lock
)
1230 spin_unlock(&nfnl_queue_pernet(seq_file_net(s
))->instances_lock
);
1233 static int seq_show(struct seq_file
*s
, void *v
)
1235 const struct nfqnl_instance
*inst
= v
;
1237 return seq_printf(s
, "%5d %6d %5d %1d %5d %5d %5d %8d %2d\n",
1239 inst
->peer_portid
, inst
->queue_total
,
1240 inst
->copy_mode
, inst
->copy_range
,
1241 inst
->queue_dropped
, inst
->queue_user_dropped
,
1242 inst
->id_sequence
, 1);
1245 static const struct seq_operations nfqnl_seq_ops
= {
1252 static int nfqnl_open(struct inode
*inode
, struct file
*file
)
1254 return seq_open_net(inode
, file
, &nfqnl_seq_ops
,
1255 sizeof(struct iter_state
));
1258 static const struct file_operations nfqnl_file_ops
= {
1259 .owner
= THIS_MODULE
,
1262 .llseek
= seq_lseek
,
1263 .release
= seq_release_net
,
1266 #endif /* PROC_FS */
1268 static int __net_init
nfnl_queue_net_init(struct net
*net
)
1271 struct nfnl_queue_net
*q
= nfnl_queue_pernet(net
);
1273 for (i
= 0; i
< INSTANCE_BUCKETS
; i
++)
1274 INIT_HLIST_HEAD(&q
->instance_table
[i
]);
1276 spin_lock_init(&q
->instances_lock
);
1278 #ifdef CONFIG_PROC_FS
1279 if (!proc_create("nfnetlink_queue", 0440,
1280 net
->nf
.proc_netfilter
, &nfqnl_file_ops
))
1286 static void __net_exit
nfnl_queue_net_exit(struct net
*net
)
1288 remove_proc_entry("nfnetlink_queue", net
->nf
.proc_netfilter
);
1291 static struct pernet_operations nfnl_queue_net_ops
= {
1292 .init
= nfnl_queue_net_init
,
1293 .exit
= nfnl_queue_net_exit
,
1294 .id
= &nfnl_queue_net_id
,
1295 .size
= sizeof(struct nfnl_queue_net
),
1298 static int __init
nfnetlink_queue_init(void)
1300 int status
= -ENOMEM
;
1302 netlink_register_notifier(&nfqnl_rtnl_notifier
);
1303 status
= nfnetlink_subsys_register(&nfqnl_subsys
);
1305 pr_err("nf_queue: failed to create netlink socket\n");
1306 goto cleanup_netlink_notifier
;
1309 status
= register_pernet_subsys(&nfnl_queue_net_ops
);
1311 pr_err("nf_queue: failed to register pernet ops\n");
1312 goto cleanup_subsys
;
1314 register_netdevice_notifier(&nfqnl_dev_notifier
);
1315 nf_register_queue_handler(&nfqh
);
1319 nfnetlink_subsys_unregister(&nfqnl_subsys
);
1320 cleanup_netlink_notifier
:
1321 netlink_unregister_notifier(&nfqnl_rtnl_notifier
);
1325 static void __exit
nfnetlink_queue_fini(void)
1327 nf_unregister_queue_handler();
1328 unregister_netdevice_notifier(&nfqnl_dev_notifier
);
1329 unregister_pernet_subsys(&nfnl_queue_net_ops
);
1330 nfnetlink_subsys_unregister(&nfqnl_subsys
);
1331 netlink_unregister_notifier(&nfqnl_rtnl_notifier
);
1333 rcu_barrier(); /* Wait for completion of call_rcu()'s */
1336 MODULE_DESCRIPTION("netfilter packet queue handler");
1337 MODULE_AUTHOR("Harald Welte <laforge@netfilter.org>");
1338 MODULE_LICENSE("GPL");
1339 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_QUEUE
);
1341 module_init(nfnetlink_queue_init
);
1342 module_exit(nfnetlink_queue_fini
);