Commit | Line | Data |
---|---|---|
7af4cc3f HW |
1 | /* |
2 | * This is a module which is used for queueing packets and communicating with | |
67137f3c | 3 | * userspace via nfnetlink. |
7af4cc3f HW |
4 | * |
5 | * (C) 2005 by Harald Welte <laforge@netfilter.org> | |
4ad9d4fa | 6 | * (C) 2007 by Patrick McHardy <kaber@trash.net> |
7af4cc3f HW |
7 | * |
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> | |
11 | * | |
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. | |
15 | * | |
16 | */ | |
17 | #include <linux/module.h> | |
18 | #include <linux/skbuff.h> | |
19 | #include <linux/init.h> | |
20 | #include <linux/spinlock.h> | |
5a0e3ad6 | 21 | #include <linux/slab.h> |
7af4cc3f HW |
22 | #include <linux/notifier.h> |
23 | #include <linux/netdevice.h> | |
24 | #include <linux/netfilter.h> | |
838ab636 | 25 | #include <linux/proc_fs.h> |
7af4cc3f HW |
26 | #include <linux/netfilter_ipv4.h> |
27 | #include <linux/netfilter_ipv6.h> | |
c737b7c4 | 28 | #include <linux/netfilter_bridge.h> |
7af4cc3f HW |
29 | #include <linux/netfilter/nfnetlink.h> |
30 | #include <linux/netfilter/nfnetlink_queue.h> | |
31 | #include <linux/list.h> | |
32 | #include <net/sock.h> | |
83111e7f | 33 | #include <net/tcp_states.h> |
c01cd429 | 34 | #include <net/netfilter/nf_queue.h> |
e8179610 | 35 | #include <net/netns/generic.h> |
7c622345 | 36 | #include <net/netfilter/nfnetlink_queue.h> |
7af4cc3f | 37 | |
60063497 | 38 | #include <linux/atomic.h> |
7af4cc3f | 39 | |
1109a90c | 40 | #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER) |
fbcd923c HW |
41 | #include "../bridge/br_private.h" |
42 | #endif | |
43 | ||
7af4cc3f HW |
44 | #define NFQNL_QMAX_DEFAULT 1024 |
45 | ||
9cefbbc9 FW |
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. | |
51 | */ | |
52 | #define NFQNL_MAX_COPY_RANGE (0xffff - NLA_HDRLEN) | |
53 | ||
7af4cc3f HW |
54 | struct nfqnl_instance { |
55 | struct hlist_node hlist; /* global list of queues */ | |
9872bec7 | 56 | struct rcu_head rcu; |
7af4cc3f | 57 | |
cc6bc448 | 58 | u32 peer_portid; |
7af4cc3f HW |
59 | unsigned int queue_maxlen; |
60 | unsigned int copy_range; | |
7af4cc3f HW |
61 | unsigned int queue_dropped; |
62 | unsigned int queue_user_dropped; | |
63 | ||
7af4cc3f HW |
64 | |
65 | u_int16_t queue_num; /* number of this queue */ | |
66 | u_int8_t copy_mode; | |
fdb694a0 | 67 | u_int32_t flags; /* Set using NFQA_CFG_FLAGS */ |
c463ac97 ED |
68 | /* |
69 | * Following fields are dirtied for each queued packet, | |
70 | * keep them in same cache line if possible. | |
71 | */ | |
72 | spinlock_t lock; | |
73 | unsigned int queue_total; | |
5863702a | 74 | unsigned int id_sequence; /* 'sequence' of pkt ids */ |
7af4cc3f HW |
75 | struct list_head queue_list; /* packets in queue */ |
76 | }; | |
77 | ||
02f014d8 | 78 | typedef int (*nfqnl_cmpfn)(struct nf_queue_entry *, unsigned long); |
7af4cc3f | 79 | |
e8179610 | 80 | static int nfnl_queue_net_id __read_mostly; |
7af4cc3f | 81 | |
7af4cc3f | 82 | #define INSTANCE_BUCKETS 16 |
e8179610 G |
83 | struct nfnl_queue_net { |
84 | spinlock_t instances_lock; | |
85 | struct hlist_head instance_table[INSTANCE_BUCKETS]; | |
86 | }; | |
87 | ||
88 | static struct nfnl_queue_net *nfnl_queue_pernet(struct net *net) | |
89 | { | |
90 | return net_generic(net, nfnl_queue_net_id); | |
91 | } | |
7af4cc3f HW |
92 | |
93 | static inline u_int8_t instance_hashfn(u_int16_t queue_num) | |
94 | { | |
1cdb0905 | 95 | return ((queue_num >> 8) ^ queue_num) % INSTANCE_BUCKETS; |
7af4cc3f HW |
96 | } |
97 | ||
98 | static struct nfqnl_instance * | |
e8179610 | 99 | instance_lookup(struct nfnl_queue_net *q, u_int16_t queue_num) |
7af4cc3f HW |
100 | { |
101 | struct hlist_head *head; | |
7af4cc3f HW |
102 | struct nfqnl_instance *inst; |
103 | ||
e8179610 | 104 | head = &q->instance_table[instance_hashfn(queue_num)]; |
b67bfe0d | 105 | hlist_for_each_entry_rcu(inst, head, hlist) { |
7af4cc3f HW |
106 | if (inst->queue_num == queue_num) |
107 | return inst; | |
108 | } | |
109 | return NULL; | |
110 | } | |
111 | ||
7af4cc3f | 112 | static struct nfqnl_instance * |
cc6bc448 | 113 | instance_create(struct nfnl_queue_net *q, u_int16_t queue_num, u32 portid) |
7af4cc3f | 114 | { |
baab2ce7 | 115 | struct nfqnl_instance *inst; |
9872bec7 | 116 | unsigned int h; |
baab2ce7 | 117 | int err; |
7af4cc3f | 118 | |
e8179610 G |
119 | spin_lock(&q->instances_lock); |
120 | if (instance_lookup(q, queue_num)) { | |
baab2ce7 | 121 | err = -EEXIST; |
7af4cc3f | 122 | goto out_unlock; |
baab2ce7 | 123 | } |
7af4cc3f | 124 | |
10dfdc69 | 125 | inst = kzalloc(sizeof(*inst), GFP_ATOMIC); |
baab2ce7 PM |
126 | if (!inst) { |
127 | err = -ENOMEM; | |
7af4cc3f | 128 | goto out_unlock; |
baab2ce7 | 129 | } |
7af4cc3f | 130 | |
7af4cc3f | 131 | inst->queue_num = queue_num; |
15e47304 | 132 | inst->peer_portid = portid; |
7af4cc3f | 133 | inst->queue_maxlen = NFQNL_QMAX_DEFAULT; |
9cefbbc9 | 134 | inst->copy_range = NFQNL_MAX_COPY_RANGE; |
7af4cc3f | 135 | inst->copy_mode = NFQNL_COPY_NONE; |
181a46a5 | 136 | spin_lock_init(&inst->lock); |
7af4cc3f HW |
137 | INIT_LIST_HEAD(&inst->queue_list); |
138 | ||
baab2ce7 PM |
139 | if (!try_module_get(THIS_MODULE)) { |
140 | err = -EAGAIN; | |
7af4cc3f | 141 | goto out_free; |
baab2ce7 | 142 | } |
7af4cc3f | 143 | |
9872bec7 | 144 | h = instance_hashfn(queue_num); |
e8179610 | 145 | hlist_add_head_rcu(&inst->hlist, &q->instance_table[h]); |
7af4cc3f | 146 | |
e8179610 | 147 | spin_unlock(&q->instances_lock); |
7af4cc3f | 148 | |
7af4cc3f HW |
149 | return inst; |
150 | ||
151 | out_free: | |
152 | kfree(inst); | |
153 | out_unlock: | |
e8179610 | 154 | spin_unlock(&q->instances_lock); |
baab2ce7 | 155 | return ERR_PTR(err); |
7af4cc3f HW |
156 | } |
157 | ||
b43d8d85 PM |
158 | static void nfqnl_flush(struct nfqnl_instance *queue, nfqnl_cmpfn cmpfn, |
159 | unsigned long data); | |
7af4cc3f HW |
160 | |
161 | static void | |
9872bec7 | 162 | instance_destroy_rcu(struct rcu_head *head) |
7af4cc3f | 163 | { |
9872bec7 PM |
164 | struct nfqnl_instance *inst = container_of(head, struct nfqnl_instance, |
165 | rcu); | |
7af4cc3f | 166 | |
b43d8d85 | 167 | nfqnl_flush(inst, NULL, 0); |
9872bec7 | 168 | kfree(inst); |
7af4cc3f HW |
169 | module_put(THIS_MODULE); |
170 | } | |
171 | ||
9872bec7 | 172 | static void |
7af4cc3f HW |
173 | __instance_destroy(struct nfqnl_instance *inst) |
174 | { | |
9872bec7 PM |
175 | hlist_del_rcu(&inst->hlist); |
176 | call_rcu(&inst->rcu, instance_destroy_rcu); | |
7af4cc3f HW |
177 | } |
178 | ||
9872bec7 | 179 | static void |
e8179610 | 180 | instance_destroy(struct nfnl_queue_net *q, struct nfqnl_instance *inst) |
7af4cc3f | 181 | { |
e8179610 | 182 | spin_lock(&q->instances_lock); |
9872bec7 | 183 | __instance_destroy(inst); |
e8179610 | 184 | spin_unlock(&q->instances_lock); |
7af4cc3f HW |
185 | } |
186 | ||
7af4cc3f | 187 | static inline void |
02f014d8 | 188 | __enqueue_entry(struct nfqnl_instance *queue, struct nf_queue_entry *entry) |
7af4cc3f | 189 | { |
0ac41e81 | 190 | list_add_tail(&entry->list, &queue->queue_list); |
7af4cc3f HW |
191 | queue->queue_total++; |
192 | } | |
193 | ||
97d32cf9 FW |
194 | static void |
195 | __dequeue_entry(struct nfqnl_instance *queue, struct nf_queue_entry *entry) | |
196 | { | |
197 | list_del(&entry->list); | |
198 | queue->queue_total--; | |
199 | } | |
200 | ||
02f014d8 | 201 | static struct nf_queue_entry * |
b43d8d85 | 202 | find_dequeue_entry(struct nfqnl_instance *queue, unsigned int id) |
7af4cc3f | 203 | { |
02f014d8 | 204 | struct nf_queue_entry *entry = NULL, *i; |
601e68e1 | 205 | |
7af4cc3f | 206 | spin_lock_bh(&queue->lock); |
b43d8d85 PM |
207 | |
208 | list_for_each_entry(i, &queue->queue_list, list) { | |
209 | if (i->id == id) { | |
210 | entry = i; | |
211 | break; | |
212 | } | |
213 | } | |
214 | ||
97d32cf9 FW |
215 | if (entry) |
216 | __dequeue_entry(queue, entry); | |
b43d8d85 | 217 | |
7af4cc3f HW |
218 | spin_unlock_bh(&queue->lock); |
219 | ||
220 | return entry; | |
221 | } | |
222 | ||
223 | static void | |
b43d8d85 | 224 | nfqnl_flush(struct nfqnl_instance *queue, nfqnl_cmpfn cmpfn, unsigned long data) |
7af4cc3f | 225 | { |
02f014d8 | 226 | struct nf_queue_entry *entry, *next; |
b43d8d85 | 227 | |
7af4cc3f | 228 | spin_lock_bh(&queue->lock); |
b43d8d85 PM |
229 | list_for_each_entry_safe(entry, next, &queue->queue_list, list) { |
230 | if (!cmpfn || cmpfn(entry, data)) { | |
231 | list_del(&entry->list); | |
232 | queue->queue_total--; | |
4b3d15ef | 233 | nf_reinject(entry, NF_DROP); |
b43d8d85 PM |
234 | } |
235 | } | |
7af4cc3f HW |
236 | spin_unlock_bh(&queue->lock); |
237 | } | |
238 | ||
496e4ae7 FW |
239 | static int |
240 | nfqnl_put_packet_info(struct sk_buff *nlskb, struct sk_buff *packet, | |
241 | bool csum_verify) | |
7237190d FW |
242 | { |
243 | __u32 flags = 0; | |
244 | ||
245 | if (packet->ip_summed == CHECKSUM_PARTIAL) | |
246 | flags = NFQA_SKB_CSUMNOTREADY; | |
496e4ae7 FW |
247 | else if (csum_verify) |
248 | flags = NFQA_SKB_CSUM_NOTVERIFIED; | |
249 | ||
7237190d FW |
250 | if (skb_is_gso(packet)) |
251 | flags |= NFQA_SKB_GSO; | |
252 | ||
253 | return flags ? nla_put_be32(nlskb, NFQA_SKB_INFO, htonl(flags)) : 0; | |
254 | } | |
255 | ||
08c0cad6 VG |
256 | static int nfqnl_put_sk_uidgid(struct sk_buff *skb, struct sock *sk) |
257 | { | |
258 | const struct cred *cred; | |
259 | ||
a8399231 | 260 | if (!sk_fullsock(sk)) |
08c0cad6 VG |
261 | return 0; |
262 | ||
263 | read_lock_bh(&sk->sk_callback_lock); | |
264 | if (sk->sk_socket && sk->sk_socket->file) { | |
265 | cred = sk->sk_socket->file->f_cred; | |
266 | if (nla_put_be32(skb, NFQA_UID, | |
267 | htonl(from_kuid_munged(&init_user_ns, cred->fsuid)))) | |
268 | goto nla_put_failure; | |
269 | if (nla_put_be32(skb, NFQA_GID, | |
270 | htonl(from_kgid_munged(&init_user_ns, cred->fsgid)))) | |
271 | goto nla_put_failure; | |
272 | } | |
273 | read_unlock_bh(&sk->sk_callback_lock); | |
274 | return 0; | |
275 | ||
276 | nla_put_failure: | |
277 | read_unlock_bh(&sk->sk_callback_lock); | |
278 | return -1; | |
279 | } | |
280 | ||
ef493bd9 RK |
281 | static u32 nfqnl_get_sk_secctx(struct sk_buff *skb, char **secdata) |
282 | { | |
283 | u32 seclen = 0; | |
284 | #if IS_ENABLED(CONFIG_NETWORK_SECMARK) | |
285 | if (!skb || !sk_fullsock(skb->sk)) | |
286 | return 0; | |
287 | ||
288 | read_lock_bh(&skb->sk->sk_callback_lock); | |
289 | ||
290 | if (skb->secmark) | |
291 | security_secid_to_secctx(skb->secmark, secdata, &seclen); | |
292 | ||
293 | read_unlock_bh(&skb->sk->sk_callback_lock); | |
294 | #endif | |
295 | return seclen; | |
296 | } | |
297 | ||
7af4cc3f | 298 | static struct sk_buff * |
74332687 | 299 | nfqnl_build_packet_message(struct net *net, struct nfqnl_instance *queue, |
5863702a ED |
300 | struct nf_queue_entry *entry, |
301 | __be32 **packet_id_ptr) | |
7af4cc3f | 302 | { |
7af4cc3f | 303 | size_t size; |
6ee584be | 304 | size_t data_len = 0, cap_len = 0; |
af2806f8 | 305 | unsigned int hlen = 0; |
7af4cc3f | 306 | struct sk_buff *skb; |
5863702a ED |
307 | struct nlattr *nla; |
308 | struct nfqnl_msg_packet_hdr *pmsg; | |
7af4cc3f HW |
309 | struct nlmsghdr *nlh; |
310 | struct nfgenmsg *nfmsg; | |
3e4ead4f JJ |
311 | struct sk_buff *entskb = entry->skb; |
312 | struct net_device *indev; | |
313 | struct net_device *outdev; | |
9cb01766 PNA |
314 | struct nf_conn *ct = NULL; |
315 | enum ip_conntrack_info uninitialized_var(ctinfo); | |
496e4ae7 | 316 | bool csum_verify; |
ef493bd9 RK |
317 | char *secdata = NULL; |
318 | u32 seclen = 0; | |
7af4cc3f | 319 | |
573ce260 | 320 | size = nlmsg_total_size(sizeof(struct nfgenmsg)) |
df6fb868 PM |
321 | + nla_total_size(sizeof(struct nfqnl_msg_packet_hdr)) |
322 | + nla_total_size(sizeof(u_int32_t)) /* ifindex */ | |
323 | + nla_total_size(sizeof(u_int32_t)) /* ifindex */ | |
1109a90c | 324 | #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER) |
df6fb868 PM |
325 | + nla_total_size(sizeof(u_int32_t)) /* ifindex */ |
326 | + nla_total_size(sizeof(u_int32_t)) /* ifindex */ | |
fbcd923c | 327 | #endif |
df6fb868 PM |
328 | + nla_total_size(sizeof(u_int32_t)) /* mark */ |
329 | + nla_total_size(sizeof(struct nfqnl_msg_packet_hw)) | |
7237190d | 330 | + nla_total_size(sizeof(u_int32_t)) /* skbinfo */ |
ae08ce00 ED |
331 | + nla_total_size(sizeof(u_int32_t)); /* cap_len */ |
332 | ||
333 | if (entskb->tstamp.tv64) | |
334 | size += nla_total_size(sizeof(struct nfqnl_msg_packet_timestamp)); | |
7af4cc3f | 335 | |
1d1de89b DM |
336 | if (entry->state.hook <= NF_INET_FORWARD || |
337 | (entry->state.hook == NF_INET_POST_ROUTING && entskb->sk == NULL)) | |
496e4ae7 FW |
338 | csum_verify = !skb_csum_unnecessary(entskb); |
339 | else | |
340 | csum_verify = false; | |
341 | ||
1d1de89b | 342 | outdev = entry->state.out; |
3e4ead4f | 343 | |
c463ac97 | 344 | switch ((enum nfqnl_config_mode)ACCESS_ONCE(queue->copy_mode)) { |
7af4cc3f HW |
345 | case NFQNL_COPY_META: |
346 | case NFQNL_COPY_NONE: | |
7af4cc3f | 347 | break; |
601e68e1 | 348 | |
7af4cc3f | 349 | case NFQNL_COPY_PACKET: |
00bd1cc2 FW |
350 | if (!(queue->flags & NFQA_CFG_F_GSO) && |
351 | entskb->ip_summed == CHECKSUM_PARTIAL && | |
c463ac97 | 352 | skb_checksum_help(entskb)) |
e7dfb09a | 353 | return NULL; |
c463ac97 ED |
354 | |
355 | data_len = ACCESS_ONCE(queue->copy_range); | |
9cefbbc9 | 356 | if (data_len > entskb->len) |
3e4ead4f | 357 | data_len = entskb->len; |
601e68e1 | 358 | |
af2806f8 TG |
359 | hlen = skb_zerocopy_headlen(entskb); |
360 | hlen = min_t(unsigned int, hlen, data_len); | |
ae08ce00 | 361 | size += sizeof(struct nlattr) + hlen; |
6ee584be | 362 | cap_len = entskb->len; |
7af4cc3f | 363 | break; |
7af4cc3f HW |
364 | } |
365 | ||
7c622345 PNA |
366 | if (queue->flags & NFQA_CFG_F_CONNTRACK) |
367 | ct = nfqnl_ct_get(entskb, &size, &ctinfo); | |
7af4cc3f | 368 | |
08c0cad6 VG |
369 | if (queue->flags & NFQA_CFG_F_UID_GID) { |
370 | size += (nla_total_size(sizeof(u_int32_t)) /* uid */ | |
371 | + nla_total_size(sizeof(u_int32_t))); /* gid */ | |
372 | } | |
373 | ||
ef493bd9 RK |
374 | if ((queue->flags & NFQA_CFG_F_SECCTX) && entskb->sk) { |
375 | seclen = nfqnl_get_sk_secctx(entskb, &secdata); | |
376 | if (seclen) | |
377 | size += nla_total_size(seclen); | |
378 | } | |
379 | ||
74332687 | 380 | skb = nfnetlink_alloc_skb(net, size, queue->peer_portid, |
3ab1f683 | 381 | GFP_ATOMIC); |
36d5fe6a ZK |
382 | if (!skb) { |
383 | skb_tx_error(entskb); | |
3da07c0c | 384 | return NULL; |
36d5fe6a | 385 | } |
601e68e1 | 386 | |
3da07c0c | 387 | nlh = nlmsg_put(skb, 0, 0, |
7af4cc3f | 388 | NFNL_SUBSYS_QUEUE << 8 | NFQNL_MSG_PACKET, |
3da07c0c DM |
389 | sizeof(struct nfgenmsg), 0); |
390 | if (!nlh) { | |
36d5fe6a | 391 | skb_tx_error(entskb); |
3da07c0c DM |
392 | kfree_skb(skb); |
393 | return NULL; | |
394 | } | |
395 | nfmsg = nlmsg_data(nlh); | |
1d1de89b | 396 | nfmsg->nfgen_family = entry->state.pf; |
7af4cc3f HW |
397 | nfmsg->version = NFNETLINK_V0; |
398 | nfmsg->res_id = htons(queue->queue_num); | |
399 | ||
5863702a ED |
400 | nla = __nla_reserve(skb, NFQA_PACKET_HDR, sizeof(*pmsg)); |
401 | pmsg = nla_data(nla); | |
402 | pmsg->hw_protocol = entskb->protocol; | |
1d1de89b | 403 | pmsg->hook = entry->state.hook; |
5863702a | 404 | *packet_id_ptr = &pmsg->packet_id; |
7af4cc3f | 405 | |
1d1de89b | 406 | indev = entry->state.in; |
3e4ead4f | 407 | if (indev) { |
1109a90c | 408 | #if !IS_ENABLED(CONFIG_BRIDGE_NETFILTER) |
a447189e DM |
409 | if (nla_put_be32(skb, NFQA_IFINDEX_INDEV, htonl(indev->ifindex))) |
410 | goto nla_put_failure; | |
fbcd923c | 411 | #else |
1d1de89b | 412 | if (entry->state.pf == PF_BRIDGE) { |
fbcd923c | 413 | /* Case 1: indev is physical input device, we need to |
601e68e1 | 414 | * look for bridge group (when called from |
fbcd923c | 415 | * netfilter_bridge) */ |
a447189e DM |
416 | if (nla_put_be32(skb, NFQA_IFINDEX_PHYSINDEV, |
417 | htonl(indev->ifindex)) || | |
fbcd923c | 418 | /* this is the bridge group "brX" */ |
f350a0a8 | 419 | /* rcu_read_lock()ed by __nf_queue */ |
a447189e DM |
420 | nla_put_be32(skb, NFQA_IFINDEX_INDEV, |
421 | htonl(br_port_get_rcu(indev)->br->dev->ifindex))) | |
422 | goto nla_put_failure; | |
fbcd923c | 423 | } else { |
c737b7c4 FW |
424 | int physinif; |
425 | ||
fbcd923c HW |
426 | /* Case 2: indev is bridge group, we need to look for |
427 | * physical device (when called from ipv4) */ | |
a447189e DM |
428 | if (nla_put_be32(skb, NFQA_IFINDEX_INDEV, |
429 | htonl(indev->ifindex))) | |
430 | goto nla_put_failure; | |
c737b7c4 FW |
431 | |
432 | physinif = nf_bridge_get_physinif(entskb); | |
433 | if (physinif && | |
a447189e | 434 | nla_put_be32(skb, NFQA_IFINDEX_PHYSINDEV, |
c737b7c4 | 435 | htonl(physinif))) |
a447189e | 436 | goto nla_put_failure; |
fbcd923c HW |
437 | } |
438 | #endif | |
7af4cc3f HW |
439 | } |
440 | ||
3e4ead4f | 441 | if (outdev) { |
1109a90c | 442 | #if !IS_ENABLED(CONFIG_BRIDGE_NETFILTER) |
a447189e DM |
443 | if (nla_put_be32(skb, NFQA_IFINDEX_OUTDEV, htonl(outdev->ifindex))) |
444 | goto nla_put_failure; | |
fbcd923c | 445 | #else |
1d1de89b | 446 | if (entry->state.pf == PF_BRIDGE) { |
fbcd923c | 447 | /* Case 1: outdev is physical output device, we need to |
601e68e1 | 448 | * look for bridge group (when called from |
fbcd923c | 449 | * netfilter_bridge) */ |
a447189e DM |
450 | if (nla_put_be32(skb, NFQA_IFINDEX_PHYSOUTDEV, |
451 | htonl(outdev->ifindex)) || | |
fbcd923c | 452 | /* this is the bridge group "brX" */ |
f350a0a8 | 453 | /* rcu_read_lock()ed by __nf_queue */ |
a447189e DM |
454 | nla_put_be32(skb, NFQA_IFINDEX_OUTDEV, |
455 | htonl(br_port_get_rcu(outdev)->br->dev->ifindex))) | |
456 | goto nla_put_failure; | |
fbcd923c | 457 | } else { |
c737b7c4 FW |
458 | int physoutif; |
459 | ||
fbcd923c HW |
460 | /* Case 2: outdev is bridge group, we need to look for |
461 | * physical output device (when called from ipv4) */ | |
a447189e DM |
462 | if (nla_put_be32(skb, NFQA_IFINDEX_OUTDEV, |
463 | htonl(outdev->ifindex))) | |
464 | goto nla_put_failure; | |
c737b7c4 FW |
465 | |
466 | physoutif = nf_bridge_get_physoutif(entskb); | |
467 | if (physoutif && | |
a447189e | 468 | nla_put_be32(skb, NFQA_IFINDEX_PHYSOUTDEV, |
c737b7c4 | 469 | htonl(physoutif))) |
a447189e | 470 | goto nla_put_failure; |
fbcd923c HW |
471 | } |
472 | #endif | |
7af4cc3f HW |
473 | } |
474 | ||
a447189e DM |
475 | if (entskb->mark && |
476 | nla_put_be32(skb, NFQA_MARK, htonl(entskb->mark))) | |
477 | goto nla_put_failure; | |
7af4cc3f | 478 | |
2c38de4c NC |
479 | if (indev && entskb->dev && |
480 | entskb->mac_header != entskb->network_header) { | |
7af4cc3f | 481 | struct nfqnl_msg_packet_hw phw; |
e4d091d7 DC |
482 | int len; |
483 | ||
484 | memset(&phw, 0, sizeof(phw)); | |
485 | len = dev_parse_header(entskb, phw.hw_addr); | |
b95cce35 SH |
486 | if (len) { |
487 | phw.hw_addrlen = htons(len); | |
a447189e DM |
488 | if (nla_put(skb, NFQA_HWADDR, sizeof(phw), &phw)) |
489 | goto nla_put_failure; | |
b95cce35 | 490 | } |
7af4cc3f HW |
491 | } |
492 | ||
b7aa0bf7 | 493 | if (entskb->tstamp.tv64) { |
7af4cc3f | 494 | struct nfqnl_msg_packet_timestamp ts; |
b7aa0bf7 ED |
495 | struct timeval tv = ktime_to_timeval(entskb->tstamp); |
496 | ts.sec = cpu_to_be64(tv.tv_sec); | |
497 | ts.usec = cpu_to_be64(tv.tv_usec); | |
7af4cc3f | 498 | |
a447189e DM |
499 | if (nla_put(skb, NFQA_TIMESTAMP, sizeof(ts), &ts)) |
500 | goto nla_put_failure; | |
7af4cc3f HW |
501 | } |
502 | ||
08c0cad6 VG |
503 | if ((queue->flags & NFQA_CFG_F_UID_GID) && entskb->sk && |
504 | nfqnl_put_sk_uidgid(skb, entskb->sk) < 0) | |
505 | goto nla_put_failure; | |
506 | ||
ef493bd9 RK |
507 | if (seclen && nla_put(skb, NFQA_SECCTX, seclen, secdata)) |
508 | goto nla_put_failure; | |
509 | ||
ae08ce00 ED |
510 | if (ct && nfqnl_ct_put(skb, ct, ctinfo) < 0) |
511 | goto nla_put_failure; | |
512 | ||
7f87712c FW |
513 | if (cap_len > data_len && |
514 | nla_put_be32(skb, NFQA_CAP_LEN, htonl(cap_len))) | |
ae08ce00 ED |
515 | goto nla_put_failure; |
516 | ||
496e4ae7 | 517 | if (nfqnl_put_packet_info(skb, entskb, csum_verify)) |
7237190d FW |
518 | goto nla_put_failure; |
519 | ||
7af4cc3f | 520 | if (data_len) { |
df6fb868 | 521 | struct nlattr *nla; |
7af4cc3f | 522 | |
ae08ce00 ED |
523 | if (skb_tailroom(skb) < sizeof(*nla) + hlen) |
524 | goto nla_put_failure; | |
7af4cc3f | 525 | |
ae08ce00 | 526 | nla = (struct nlattr *)skb_put(skb, sizeof(*nla)); |
df6fb868 | 527 | nla->nla_type = NFQA_PAYLOAD; |
ae08ce00 | 528 | nla->nla_len = nla_attr_size(data_len); |
7af4cc3f | 529 | |
36d5fe6a ZK |
530 | if (skb_zerocopy(skb, entskb, data_len, hlen)) |
531 | goto nla_put_failure; | |
7af4cc3f | 532 | } |
601e68e1 | 533 | |
ae08ce00 | 534 | nlh->nlmsg_len = skb->len; |
7af4cc3f HW |
535 | return skb; |
536 | ||
df6fb868 | 537 | nla_put_failure: |
36d5fe6a | 538 | skb_tx_error(entskb); |
a6729955 | 539 | kfree_skb(skb); |
e87cc472 | 540 | net_err_ratelimited("nf_queue: error creating packet message\n"); |
7af4cc3f HW |
541 | return NULL; |
542 | } | |
543 | ||
544 | static int | |
a5fedd43 FW |
545 | __nfqnl_enqueue_packet(struct net *net, struct nfqnl_instance *queue, |
546 | struct nf_queue_entry *entry) | |
7af4cc3f | 547 | { |
7af4cc3f | 548 | struct sk_buff *nskb; |
f1585086 | 549 | int err = -ENOBUFS; |
5863702a | 550 | __be32 *packet_id_ptr; |
fdb694a0 | 551 | int failopen = 0; |
7af4cc3f | 552 | |
74332687 | 553 | nskb = nfqnl_build_packet_message(net, queue, entry, &packet_id_ptr); |
f1585086 FW |
554 | if (nskb == NULL) { |
555 | err = -ENOMEM; | |
0ef0f465 | 556 | goto err_out; |
f1585086 | 557 | } |
7af4cc3f | 558 | spin_lock_bh(&queue->lock); |
601e68e1 | 559 | |
7af4cc3f | 560 | if (queue->queue_total >= queue->queue_maxlen) { |
fdb694a0 KK |
561 | if (queue->flags & NFQA_CFG_F_FAIL_OPEN) { |
562 | failopen = 1; | |
563 | err = 0; | |
564 | } else { | |
565 | queue->queue_dropped++; | |
566 | net_warn_ratelimited("nf_queue: full at %d entries, dropping packets(s)\n", | |
567 | queue->queue_total); | |
568 | } | |
7af4cc3f HW |
569 | goto err_out_free_nskb; |
570 | } | |
5863702a ED |
571 | entry->id = ++queue->id_sequence; |
572 | *packet_id_ptr = htonl(entry->id); | |
7af4cc3f HW |
573 | |
574 | /* nfnetlink_unicast will either free the nskb or add it to a socket */ | |
e8179610 | 575 | err = nfnetlink_unicast(nskb, net, queue->peer_portid, MSG_DONTWAIT); |
0ef0f465 | 576 | if (err < 0) { |
601e68e1 | 577 | queue->queue_user_dropped++; |
7af4cc3f HW |
578 | goto err_out_unlock; |
579 | } | |
580 | ||
581 | __enqueue_entry(queue, entry); | |
582 | ||
583 | spin_unlock_bh(&queue->lock); | |
0ef0f465 | 584 | return 0; |
7af4cc3f HW |
585 | |
586 | err_out_free_nskb: | |
601e68e1 | 587 | kfree_skb(nskb); |
7af4cc3f HW |
588 | err_out_unlock: |
589 | spin_unlock_bh(&queue->lock); | |
fdb694a0 KK |
590 | if (failopen) |
591 | nf_reinject(entry, NF_ACCEPT); | |
0ef0f465 | 592 | err_out: |
f1585086 | 593 | return err; |
7af4cc3f HW |
594 | } |
595 | ||
a5fedd43 FW |
596 | static struct nf_queue_entry * |
597 | nf_queue_entry_dup(struct nf_queue_entry *e) | |
598 | { | |
599 | struct nf_queue_entry *entry = kmemdup(e, e->size, GFP_ATOMIC); | |
600 | if (entry) { | |
601 | if (nf_queue_entry_get_refs(entry)) | |
602 | return entry; | |
603 | kfree(entry); | |
604 | } | |
605 | return NULL; | |
606 | } | |
607 | ||
1109a90c | 608 | #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER) |
a5fedd43 FW |
609 | /* When called from bridge netfilter, skb->data must point to MAC header |
610 | * before calling skb_gso_segment(). Else, original MAC header is lost | |
611 | * and segmented skbs will be sent to wrong destination. | |
612 | */ | |
613 | static void nf_bridge_adjust_skb_data(struct sk_buff *skb) | |
614 | { | |
615 | if (skb->nf_bridge) | |
616 | __skb_push(skb, skb->network_header - skb->mac_header); | |
617 | } | |
618 | ||
619 | static void nf_bridge_adjust_segmented_data(struct sk_buff *skb) | |
620 | { | |
621 | if (skb->nf_bridge) | |
622 | __skb_pull(skb, skb->network_header - skb->mac_header); | |
623 | } | |
624 | #else | |
625 | #define nf_bridge_adjust_skb_data(s) do {} while (0) | |
626 | #define nf_bridge_adjust_segmented_data(s) do {} while (0) | |
627 | #endif | |
628 | ||
629 | static void free_entry(struct nf_queue_entry *entry) | |
630 | { | |
631 | nf_queue_entry_release_refs(entry); | |
632 | kfree(entry); | |
633 | } | |
634 | ||
635 | static int | |
636 | __nfqnl_enqueue_packet_gso(struct net *net, struct nfqnl_instance *queue, | |
637 | struct sk_buff *skb, struct nf_queue_entry *entry) | |
638 | { | |
639 | int ret = -ENOMEM; | |
640 | struct nf_queue_entry *entry_seg; | |
641 | ||
642 | nf_bridge_adjust_segmented_data(skb); | |
643 | ||
644 | if (skb->next == NULL) { /* last packet, no need to copy entry */ | |
645 | struct sk_buff *gso_skb = entry->skb; | |
646 | entry->skb = skb; | |
647 | ret = __nfqnl_enqueue_packet(net, queue, entry); | |
648 | if (ret) | |
649 | entry->skb = gso_skb; | |
650 | return ret; | |
651 | } | |
652 | ||
653 | skb->next = NULL; | |
654 | ||
655 | entry_seg = nf_queue_entry_dup(entry); | |
656 | if (entry_seg) { | |
657 | entry_seg->skb = skb; | |
658 | ret = __nfqnl_enqueue_packet(net, queue, entry_seg); | |
659 | if (ret) | |
660 | free_entry(entry_seg); | |
661 | } | |
662 | return ret; | |
663 | } | |
664 | ||
665 | static int | |
666 | nfqnl_enqueue_packet(struct nf_queue_entry *entry, unsigned int queuenum) | |
667 | { | |
668 | unsigned int queued; | |
669 | struct nfqnl_instance *queue; | |
670 | struct sk_buff *skb, *segs; | |
671 | int err = -ENOBUFS; | |
1d1de89b DM |
672 | struct net *net = dev_net(entry->state.in ? |
673 | entry->state.in : entry->state.out); | |
a5fedd43 FW |
674 | struct nfnl_queue_net *q = nfnl_queue_pernet(net); |
675 | ||
676 | /* rcu_read_lock()ed by nf_hook_slow() */ | |
677 | queue = instance_lookup(q, queuenum); | |
678 | if (!queue) | |
679 | return -ESRCH; | |
680 | ||
681 | if (queue->copy_mode == NFQNL_COPY_NONE) | |
682 | return -EINVAL; | |
683 | ||
a5fedd43 FW |
684 | skb = entry->skb; |
685 | ||
1d1de89b | 686 | switch (entry->state.pf) { |
a5fedd43 FW |
687 | case NFPROTO_IPV4: |
688 | skb->protocol = htons(ETH_P_IP); | |
689 | break; | |
690 | case NFPROTO_IPV6: | |
691 | skb->protocol = htons(ETH_P_IPV6); | |
692 | break; | |
693 | } | |
694 | ||
7b8dfe28 PNA |
695 | if ((queue->flags & NFQA_CFG_F_GSO) || !skb_is_gso(skb)) |
696 | return __nfqnl_enqueue_packet(net, queue, entry); | |
697 | ||
a5fedd43 FW |
698 | nf_bridge_adjust_skb_data(skb); |
699 | segs = skb_gso_segment(skb, 0); | |
700 | /* Does not use PTR_ERR to limit the number of error codes that can be | |
701 | * returned by nf_queue. For instance, callers rely on -ECANCELED to | |
702 | * mean 'ignore this hook'. | |
703 | */ | |
330966e5 | 704 | if (IS_ERR_OR_NULL(segs)) |
a5fedd43 FW |
705 | goto out_err; |
706 | queued = 0; | |
707 | err = 0; | |
708 | do { | |
709 | struct sk_buff *nskb = segs->next; | |
710 | if (err == 0) | |
711 | err = __nfqnl_enqueue_packet_gso(net, queue, | |
712 | segs, entry); | |
713 | if (err == 0) | |
714 | queued++; | |
715 | else | |
716 | kfree_skb(segs); | |
717 | segs = nskb; | |
718 | } while (segs); | |
719 | ||
720 | if (queued) { | |
721 | if (err) /* some segments are already queued */ | |
722 | free_entry(entry); | |
723 | kfree_skb(skb); | |
724 | return 0; | |
725 | } | |
726 | out_err: | |
727 | nf_bridge_adjust_segmented_data(skb); | |
728 | return err; | |
729 | } | |
730 | ||
7af4cc3f | 731 | static int |
8c88f87c | 732 | nfqnl_mangle(void *data, int data_len, struct nf_queue_entry *e, int diff) |
7af4cc3f | 733 | { |
e2b58a67 | 734 | struct sk_buff *nskb; |
7af4cc3f | 735 | |
d8a585d7 PM |
736 | if (diff < 0) { |
737 | if (pskb_trim(e->skb, data_len)) | |
738 | return -ENOMEM; | |
739 | } else if (diff > 0) { | |
7af4cc3f HW |
740 | if (data_len > 0xFFFF) |
741 | return -EINVAL; | |
742 | if (diff > skb_tailroom(e->skb)) { | |
9a732ed6 AE |
743 | nskb = skb_copy_expand(e->skb, skb_headroom(e->skb), |
744 | diff, GFP_ATOMIC); | |
e2b58a67 | 745 | if (!nskb) { |
1158ba27 | 746 | printk(KERN_WARNING "nf_queue: OOM " |
7af4cc3f | 747 | "in mangle, dropping packet\n"); |
e2b58a67 | 748 | return -ENOMEM; |
7af4cc3f | 749 | } |
e2b58a67 PM |
750 | kfree_skb(e->skb); |
751 | e->skb = nskb; | |
7af4cc3f HW |
752 | } |
753 | skb_put(e->skb, diff); | |
754 | } | |
37d41879 | 755 | if (!skb_make_writable(e->skb, data_len)) |
7af4cc3f | 756 | return -ENOMEM; |
27d7ff46 | 757 | skb_copy_to_linear_data(e->skb, data, data_len); |
e7dfb09a | 758 | e->skb->ip_summed = CHECKSUM_NONE; |
7af4cc3f HW |
759 | return 0; |
760 | } | |
761 | ||
7af4cc3f HW |
762 | static int |
763 | nfqnl_set_mode(struct nfqnl_instance *queue, | |
764 | unsigned char mode, unsigned int range) | |
765 | { | |
c5de0dfd | 766 | int status = 0; |
7af4cc3f HW |
767 | |
768 | spin_lock_bh(&queue->lock); | |
c5de0dfd PM |
769 | switch (mode) { |
770 | case NFQNL_COPY_NONE: | |
771 | case NFQNL_COPY_META: | |
772 | queue->copy_mode = mode; | |
773 | queue->copy_range = 0; | |
774 | break; | |
775 | ||
776 | case NFQNL_COPY_PACKET: | |
777 | queue->copy_mode = mode; | |
9cefbbc9 FW |
778 | if (range == 0 || range > NFQNL_MAX_COPY_RANGE) |
779 | queue->copy_range = NFQNL_MAX_COPY_RANGE; | |
c5de0dfd PM |
780 | else |
781 | queue->copy_range = range; | |
782 | break; | |
783 | ||
784 | default: | |
785 | status = -EINVAL; | |
786 | ||
787 | } | |
7af4cc3f HW |
788 | spin_unlock_bh(&queue->lock); |
789 | ||
790 | return status; | |
791 | } | |
792 | ||
793 | static int | |
02f014d8 | 794 | dev_cmp(struct nf_queue_entry *entry, unsigned long ifindex) |
7af4cc3f | 795 | { |
1d1de89b DM |
796 | if (entry->state.in) |
797 | if (entry->state.in->ifindex == ifindex) | |
7af4cc3f | 798 | return 1; |
1d1de89b DM |
799 | if (entry->state.out) |
800 | if (entry->state.out->ifindex == ifindex) | |
7af4cc3f | 801 | return 1; |
1109a90c | 802 | #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER) |
ef47c6a7 | 803 | if (entry->skb->nf_bridge) { |
c737b7c4 FW |
804 | int physinif, physoutif; |
805 | ||
806 | physinif = nf_bridge_get_physinif(entry->skb); | |
807 | physoutif = nf_bridge_get_physoutif(entry->skb); | |
808 | ||
809 | if (physinif == ifindex || physoutif == ifindex) | |
ef47c6a7 PM |
810 | return 1; |
811 | } | |
812 | #endif | |
7af4cc3f HW |
813 | return 0; |
814 | } | |
815 | ||
816 | /* drop all packets with either indev or outdev == ifindex from all queue | |
817 | * instances */ | |
818 | static void | |
e8179610 | 819 | nfqnl_dev_drop(struct net *net, int ifindex) |
7af4cc3f HW |
820 | { |
821 | int i; | |
e8179610 | 822 | struct nfnl_queue_net *q = nfnl_queue_pernet(net); |
601e68e1 | 823 | |
9872bec7 | 824 | rcu_read_lock(); |
7af4cc3f | 825 | |
9872bec7 | 826 | for (i = 0; i < INSTANCE_BUCKETS; i++) { |
7af4cc3f | 827 | struct nfqnl_instance *inst; |
e8179610 | 828 | struct hlist_head *head = &q->instance_table[i]; |
7af4cc3f | 829 | |
b67bfe0d | 830 | hlist_for_each_entry_rcu(inst, head, hlist) |
b43d8d85 | 831 | nfqnl_flush(inst, dev_cmp, ifindex); |
7af4cc3f HW |
832 | } |
833 | ||
9872bec7 | 834 | rcu_read_unlock(); |
7af4cc3f HW |
835 | } |
836 | ||
7af4cc3f HW |
837 | static int |
838 | nfqnl_rcv_dev_event(struct notifier_block *this, | |
839 | unsigned long event, void *ptr) | |
840 | { | |
351638e7 | 841 | struct net_device *dev = netdev_notifier_info_to_dev(ptr); |
7af4cc3f HW |
842 | |
843 | /* Drop any packets associated with the downed device */ | |
844 | if (event == NETDEV_DOWN) | |
e8179610 | 845 | nfqnl_dev_drop(dev_net(dev), dev->ifindex); |
7af4cc3f HW |
846 | return NOTIFY_DONE; |
847 | } | |
848 | ||
849 | static struct notifier_block nfqnl_dev_notifier = { | |
850 | .notifier_call = nfqnl_rcv_dev_event, | |
851 | }; | |
852 | ||
8405a8ff EB |
853 | static int nf_hook_cmp(struct nf_queue_entry *entry, unsigned long ops_ptr) |
854 | { | |
855 | return entry->elem == (struct nf_hook_ops *)ops_ptr; | |
856 | } | |
857 | ||
858 | static void nfqnl_nf_hook_drop(struct net *net, struct nf_hook_ops *hook) | |
859 | { | |
860 | struct nfnl_queue_net *q = nfnl_queue_pernet(net); | |
861 | int i; | |
862 | ||
863 | rcu_read_lock(); | |
864 | for (i = 0; i < INSTANCE_BUCKETS; i++) { | |
865 | struct nfqnl_instance *inst; | |
866 | struct hlist_head *head = &q->instance_table[i]; | |
867 | ||
868 | hlist_for_each_entry_rcu(inst, head, hlist) | |
869 | nfqnl_flush(inst, nf_hook_cmp, (unsigned long)hook); | |
870 | } | |
871 | rcu_read_unlock(); | |
872 | } | |
873 | ||
7af4cc3f HW |
874 | static int |
875 | nfqnl_rcv_nl_event(struct notifier_block *this, | |
876 | unsigned long event, void *ptr) | |
877 | { | |
878 | struct netlink_notify *n = ptr; | |
e8179610 | 879 | struct nfnl_queue_net *q = nfnl_queue_pernet(n->net); |
7af4cc3f | 880 | |
dee5817e | 881 | if (event == NETLINK_URELEASE && n->protocol == NETLINK_NETFILTER) { |
7af4cc3f HW |
882 | int i; |
883 | ||
15e47304 | 884 | /* destroy all instances for this portid */ |
e8179610 | 885 | spin_lock(&q->instances_lock); |
9872bec7 | 886 | for (i = 0; i < INSTANCE_BUCKETS; i++) { |
b67bfe0d | 887 | struct hlist_node *t2; |
7af4cc3f | 888 | struct nfqnl_instance *inst; |
e8179610 | 889 | struct hlist_head *head = &q->instance_table[i]; |
7af4cc3f | 890 | |
b67bfe0d | 891 | hlist_for_each_entry_safe(inst, t2, head, hlist) { |
e8179610 | 892 | if (n->portid == inst->peer_portid) |
7af4cc3f HW |
893 | __instance_destroy(inst); |
894 | } | |
895 | } | |
e8179610 | 896 | spin_unlock(&q->instances_lock); |
7af4cc3f HW |
897 | } |
898 | return NOTIFY_DONE; | |
899 | } | |
900 | ||
901 | static struct notifier_block nfqnl_rtnl_notifier = { | |
902 | .notifier_call = nfqnl_rcv_nl_event, | |
903 | }; | |
904 | ||
5bf75853 PM |
905 | static const struct nla_policy nfqa_verdict_policy[NFQA_MAX+1] = { |
906 | [NFQA_VERDICT_HDR] = { .len = sizeof(struct nfqnl_msg_verdict_hdr) }, | |
907 | [NFQA_MARK] = { .type = NLA_U32 }, | |
908 | [NFQA_PAYLOAD] = { .type = NLA_UNSPEC }, | |
9cb01766 | 909 | [NFQA_CT] = { .type = NLA_UNSPEC }, |
bd077937 | 910 | [NFQA_EXP] = { .type = NLA_UNSPEC }, |
838ab636 HW |
911 | }; |
912 | ||
97d32cf9 FW |
913 | static const struct nla_policy nfqa_verdict_batch_policy[NFQA_MAX+1] = { |
914 | [NFQA_VERDICT_HDR] = { .len = sizeof(struct nfqnl_msg_verdict_hdr) }, | |
915 | [NFQA_MARK] = { .type = NLA_U32 }, | |
916 | }; | |
917 | ||
e8179610 | 918 | static struct nfqnl_instance * |
cc6bc448 | 919 | verdict_instance_lookup(struct nfnl_queue_net *q, u16 queue_num, u32 nlportid) |
97d32cf9 FW |
920 | { |
921 | struct nfqnl_instance *queue; | |
922 | ||
e8179610 | 923 | queue = instance_lookup(q, queue_num); |
97d32cf9 FW |
924 | if (!queue) |
925 | return ERR_PTR(-ENODEV); | |
926 | ||
15e47304 | 927 | if (queue->peer_portid != nlportid) |
97d32cf9 FW |
928 | return ERR_PTR(-EPERM); |
929 | ||
930 | return queue; | |
931 | } | |
932 | ||
933 | static struct nfqnl_msg_verdict_hdr* | |
934 | verdicthdr_get(const struct nlattr * const nfqa[]) | |
935 | { | |
936 | struct nfqnl_msg_verdict_hdr *vhdr; | |
937 | unsigned int verdict; | |
938 | ||
939 | if (!nfqa[NFQA_VERDICT_HDR]) | |
940 | return NULL; | |
941 | ||
942 | vhdr = nla_data(nfqa[NFQA_VERDICT_HDR]); | |
c6675233 FW |
943 | verdict = ntohl(vhdr->verdict) & NF_VERDICT_MASK; |
944 | if (verdict > NF_MAX_VERDICT || verdict == NF_STOLEN) | |
97d32cf9 FW |
945 | return NULL; |
946 | return vhdr; | |
947 | } | |
948 | ||
949 | static int nfq_id_after(unsigned int id, unsigned int max) | |
950 | { | |
951 | return (int)(id - max) > 0; | |
952 | } | |
953 | ||
954 | static int | |
955 | nfqnl_recv_verdict_batch(struct sock *ctnl, struct sk_buff *skb, | |
956 | const struct nlmsghdr *nlh, | |
957 | const struct nlattr * const nfqa[]) | |
958 | { | |
3da07c0c | 959 | struct nfgenmsg *nfmsg = nlmsg_data(nlh); |
97d32cf9 FW |
960 | struct nf_queue_entry *entry, *tmp; |
961 | unsigned int verdict, maxid; | |
962 | struct nfqnl_msg_verdict_hdr *vhdr; | |
963 | struct nfqnl_instance *queue; | |
964 | LIST_HEAD(batch_list); | |
965 | u16 queue_num = ntohs(nfmsg->res_id); | |
966 | ||
e8179610 G |
967 | struct net *net = sock_net(ctnl); |
968 | struct nfnl_queue_net *q = nfnl_queue_pernet(net); | |
969 | ||
970 | queue = verdict_instance_lookup(q, queue_num, | |
971 | NETLINK_CB(skb).portid); | |
97d32cf9 FW |
972 | if (IS_ERR(queue)) |
973 | return PTR_ERR(queue); | |
974 | ||
975 | vhdr = verdicthdr_get(nfqa); | |
976 | if (!vhdr) | |
977 | return -EINVAL; | |
978 | ||
979 | verdict = ntohl(vhdr->verdict); | |
980 | maxid = ntohl(vhdr->id); | |
981 | ||
982 | spin_lock_bh(&queue->lock); | |
983 | ||
984 | list_for_each_entry_safe(entry, tmp, &queue->queue_list, list) { | |
985 | if (nfq_id_after(entry->id, maxid)) | |
986 | break; | |
987 | __dequeue_entry(queue, entry); | |
988 | list_add_tail(&entry->list, &batch_list); | |
989 | } | |
990 | ||
991 | spin_unlock_bh(&queue->lock); | |
992 | ||
993 | if (list_empty(&batch_list)) | |
994 | return -ENOENT; | |
995 | ||
996 | list_for_each_entry_safe(entry, tmp, &batch_list, list) { | |
997 | if (nfqa[NFQA_MARK]) | |
998 | entry->skb->mark = ntohl(nla_get_be32(nfqa[NFQA_MARK])); | |
999 | nf_reinject(entry, verdict); | |
1000 | } | |
1001 | return 0; | |
1002 | } | |
1003 | ||
7af4cc3f HW |
1004 | static int |
1005 | nfqnl_recv_verdict(struct sock *ctnl, struct sk_buff *skb, | |
39938324 PM |
1006 | const struct nlmsghdr *nlh, |
1007 | const struct nlattr * const nfqa[]) | |
7af4cc3f | 1008 | { |
3da07c0c | 1009 | struct nfgenmsg *nfmsg = nlmsg_data(nlh); |
7af4cc3f HW |
1010 | u_int16_t queue_num = ntohs(nfmsg->res_id); |
1011 | ||
1012 | struct nfqnl_msg_verdict_hdr *vhdr; | |
1013 | struct nfqnl_instance *queue; | |
1014 | unsigned int verdict; | |
02f014d8 | 1015 | struct nf_queue_entry *entry; |
8c88f87c PNA |
1016 | enum ip_conntrack_info uninitialized_var(ctinfo); |
1017 | struct nf_conn *ct = NULL; | |
7af4cc3f | 1018 | |
e8179610 G |
1019 | struct net *net = sock_net(ctnl); |
1020 | struct nfnl_queue_net *q = nfnl_queue_pernet(net); | |
7af4cc3f | 1021 | |
e8179610 G |
1022 | queue = instance_lookup(q, queue_num); |
1023 | if (!queue) | |
1024 | queue = verdict_instance_lookup(q, queue_num, | |
1025 | NETLINK_CB(skb).portid); | |
97d32cf9 FW |
1026 | if (IS_ERR(queue)) |
1027 | return PTR_ERR(queue); | |
7af4cc3f | 1028 | |
97d32cf9 FW |
1029 | vhdr = verdicthdr_get(nfqa); |
1030 | if (!vhdr) | |
84a797dd | 1031 | return -EINVAL; |
7af4cc3f | 1032 | |
7af4cc3f HW |
1033 | verdict = ntohl(vhdr->verdict); |
1034 | ||
b43d8d85 | 1035 | entry = find_dequeue_entry(queue, ntohl(vhdr->id)); |
84a797dd ED |
1036 | if (entry == NULL) |
1037 | return -ENOENT; | |
7af4cc3f | 1038 | |
bd077937 | 1039 | if (nfqa[NFQA_CT]) { |
7c622345 | 1040 | ct = nfqnl_ct_parse(entry->skb, nfqa[NFQA_CT], &ctinfo); |
bd077937 PNA |
1041 | if (ct && nfqa[NFQA_EXP]) { |
1042 | nfqnl_attach_expect(ct, nfqa[NFQA_EXP], | |
1043 | NETLINK_CB(skb).portid, | |
1044 | nlmsg_report(nlh)); | |
1045 | } | |
1046 | } | |
9cb01766 | 1047 | |
df6fb868 | 1048 | if (nfqa[NFQA_PAYLOAD]) { |
8c88f87c PNA |
1049 | u16 payload_len = nla_len(nfqa[NFQA_PAYLOAD]); |
1050 | int diff = payload_len - entry->skb->len; | |
1051 | ||
df6fb868 | 1052 | if (nfqnl_mangle(nla_data(nfqa[NFQA_PAYLOAD]), |
8c88f87c | 1053 | payload_len, entry, diff) < 0) |
7af4cc3f | 1054 | verdict = NF_DROP; |
8c88f87c | 1055 | |
7c622345 | 1056 | if (ct) |
0a0d80eb | 1057 | nfqnl_ct_seq_adjust(entry->skb, ct, ctinfo, diff); |
7af4cc3f HW |
1058 | } |
1059 | ||
df6fb868 | 1060 | if (nfqa[NFQA_MARK]) |
ea3a66ff | 1061 | entry->skb->mark = ntohl(nla_get_be32(nfqa[NFQA_MARK])); |
601e68e1 | 1062 | |
4b3d15ef | 1063 | nf_reinject(entry, verdict); |
7af4cc3f HW |
1064 | return 0; |
1065 | } | |
1066 | ||
1067 | static int | |
1068 | nfqnl_recv_unsupp(struct sock *ctnl, struct sk_buff *skb, | |
39938324 PM |
1069 | const struct nlmsghdr *nlh, |
1070 | const struct nlattr * const nfqa[]) | |
7af4cc3f HW |
1071 | { |
1072 | return -ENOTSUPP; | |
1073 | } | |
1074 | ||
5bf75853 PM |
1075 | static const struct nla_policy nfqa_cfg_policy[NFQA_CFG_MAX+1] = { |
1076 | [NFQA_CFG_CMD] = { .len = sizeof(struct nfqnl_msg_config_cmd) }, | |
1077 | [NFQA_CFG_PARAMS] = { .len = sizeof(struct nfqnl_msg_config_params) }, | |
838ab636 HW |
1078 | }; |
1079 | ||
e3ac5298 | 1080 | static const struct nf_queue_handler nfqh = { |
8405a8ff EB |
1081 | .outfn = &nfqnl_enqueue_packet, |
1082 | .nf_hook_drop = &nfqnl_nf_hook_drop, | |
bbd86b9f HW |
1083 | }; |
1084 | ||
7af4cc3f HW |
1085 | static int |
1086 | nfqnl_recv_config(struct sock *ctnl, struct sk_buff *skb, | |
39938324 PM |
1087 | const struct nlmsghdr *nlh, |
1088 | const struct nlattr * const nfqa[]) | |
7af4cc3f | 1089 | { |
3da07c0c | 1090 | struct nfgenmsg *nfmsg = nlmsg_data(nlh); |
7af4cc3f HW |
1091 | u_int16_t queue_num = ntohs(nfmsg->res_id); |
1092 | struct nfqnl_instance *queue; | |
9872bec7 | 1093 | struct nfqnl_msg_config_cmd *cmd = NULL; |
e8179610 G |
1094 | struct net *net = sock_net(ctnl); |
1095 | struct nfnl_queue_net *q = nfnl_queue_pernet(net); | |
838ab636 | 1096 | int ret = 0; |
7af4cc3f | 1097 | |
9872bec7 PM |
1098 | if (nfqa[NFQA_CFG_CMD]) { |
1099 | cmd = nla_data(nfqa[NFQA_CFG_CMD]); | |
1100 | ||
0360ae41 | 1101 | /* Obsolete commands without queue context */ |
9872bec7 | 1102 | switch (cmd->command) { |
0360ae41 FW |
1103 | case NFQNL_CFG_CMD_PF_BIND: return 0; |
1104 | case NFQNL_CFG_CMD_PF_UNBIND: return 0; | |
9872bec7 | 1105 | } |
9872bec7 PM |
1106 | } |
1107 | ||
1108 | rcu_read_lock(); | |
e8179610 | 1109 | queue = instance_lookup(q, queue_num); |
15e47304 | 1110 | if (queue && queue->peer_portid != NETLINK_CB(skb).portid) { |
a3c8e7fd | 1111 | ret = -EPERM; |
9872bec7 | 1112 | goto err_out_unlock; |
a3c8e7fd PM |
1113 | } |
1114 | ||
9872bec7 | 1115 | if (cmd != NULL) { |
7af4cc3f HW |
1116 | switch (cmd->command) { |
1117 | case NFQNL_CFG_CMD_BIND: | |
9872bec7 PM |
1118 | if (queue) { |
1119 | ret = -EBUSY; | |
1120 | goto err_out_unlock; | |
1121 | } | |
e8179610 G |
1122 | queue = instance_create(q, queue_num, |
1123 | NETLINK_CB(skb).portid); | |
baab2ce7 PM |
1124 | if (IS_ERR(queue)) { |
1125 | ret = PTR_ERR(queue); | |
9872bec7 PM |
1126 | goto err_out_unlock; |
1127 | } | |
7af4cc3f HW |
1128 | break; |
1129 | case NFQNL_CFG_CMD_UNBIND: | |
9872bec7 PM |
1130 | if (!queue) { |
1131 | ret = -ENODEV; | |
1132 | goto err_out_unlock; | |
1133 | } | |
e8179610 | 1134 | instance_destroy(q, queue); |
7af4cc3f HW |
1135 | break; |
1136 | case NFQNL_CFG_CMD_PF_BIND: | |
7af4cc3f | 1137 | case NFQNL_CFG_CMD_PF_UNBIND: |
7af4cc3f HW |
1138 | break; |
1139 | default: | |
cd21f0ac | 1140 | ret = -ENOTSUPP; |
838ab636 | 1141 | break; |
7af4cc3f | 1142 | } |
7af4cc3f HW |
1143 | } |
1144 | ||
df6fb868 | 1145 | if (nfqa[NFQA_CFG_PARAMS]) { |
7af4cc3f | 1146 | struct nfqnl_msg_config_params *params; |
7af4cc3f | 1147 | |
406dbfc9 | 1148 | if (!queue) { |
a3c8e7fd | 1149 | ret = -ENODEV; |
9872bec7 | 1150 | goto err_out_unlock; |
406dbfc9 | 1151 | } |
df6fb868 | 1152 | params = nla_data(nfqa[NFQA_CFG_PARAMS]); |
7af4cc3f HW |
1153 | nfqnl_set_mode(queue, params->copy_mode, |
1154 | ntohl(params->copy_range)); | |
1155 | } | |
1156 | ||
df6fb868 | 1157 | if (nfqa[NFQA_CFG_QUEUE_MAXLEN]) { |
829e17a1 | 1158 | __be32 *queue_maxlen; |
a3c8e7fd PM |
1159 | |
1160 | if (!queue) { | |
1161 | ret = -ENODEV; | |
9872bec7 | 1162 | goto err_out_unlock; |
a3c8e7fd | 1163 | } |
df6fb868 | 1164 | queue_maxlen = nla_data(nfqa[NFQA_CFG_QUEUE_MAXLEN]); |
829e17a1 EL |
1165 | spin_lock_bh(&queue->lock); |
1166 | queue->queue_maxlen = ntohl(*queue_maxlen); | |
1167 | spin_unlock_bh(&queue->lock); | |
1168 | } | |
1169 | ||
fdb694a0 KK |
1170 | if (nfqa[NFQA_CFG_FLAGS]) { |
1171 | __u32 flags, mask; | |
1172 | ||
1173 | if (!queue) { | |
1174 | ret = -ENODEV; | |
1175 | goto err_out_unlock; | |
1176 | } | |
1177 | ||
1178 | if (!nfqa[NFQA_CFG_MASK]) { | |
1179 | /* A mask is needed to specify which flags are being | |
1180 | * changed. | |
1181 | */ | |
1182 | ret = -EINVAL; | |
1183 | goto err_out_unlock; | |
1184 | } | |
1185 | ||
1186 | flags = ntohl(nla_get_be32(nfqa[NFQA_CFG_FLAGS])); | |
1187 | mask = ntohl(nla_get_be32(nfqa[NFQA_CFG_MASK])); | |
1188 | ||
46ba5a25 KK |
1189 | if (flags >= NFQA_CFG_F_MAX) { |
1190 | ret = -EOPNOTSUPP; | |
1191 | goto err_out_unlock; | |
1192 | } | |
ef493bd9 RK |
1193 | #if !IS_ENABLED(CONFIG_NETWORK_SECMARK) |
1194 | if (flags & mask & NFQA_CFG_F_SECCTX) { | |
1195 | ret = -EOPNOTSUPP; | |
1196 | goto err_out_unlock; | |
1197 | } | |
1198 | #endif | |
fdb694a0 KK |
1199 | spin_lock_bh(&queue->lock); |
1200 | queue->flags &= ~mask; | |
1201 | queue->flags |= flags & mask; | |
1202 | spin_unlock_bh(&queue->lock); | |
1203 | } | |
1204 | ||
9872bec7 PM |
1205 | err_out_unlock: |
1206 | rcu_read_unlock(); | |
838ab636 | 1207 | return ret; |
7af4cc3f HW |
1208 | } |
1209 | ||
7c8d4cb4 | 1210 | static const struct nfnl_callback nfqnl_cb[NFQNL_MSG_MAX] = { |
84a797dd | 1211 | [NFQNL_MSG_PACKET] = { .call_rcu = nfqnl_recv_unsupp, |
37d2e7a2 | 1212 | .attr_count = NFQA_MAX, }, |
84a797dd | 1213 | [NFQNL_MSG_VERDICT] = { .call_rcu = nfqnl_recv_verdict, |
5bf75853 PM |
1214 | .attr_count = NFQA_MAX, |
1215 | .policy = nfqa_verdict_policy }, | |
7af4cc3f | 1216 | [NFQNL_MSG_CONFIG] = { .call = nfqnl_recv_config, |
5bf75853 PM |
1217 | .attr_count = NFQA_CFG_MAX, |
1218 | .policy = nfqa_cfg_policy }, | |
97d32cf9 FW |
1219 | [NFQNL_MSG_VERDICT_BATCH]={ .call_rcu = nfqnl_recv_verdict_batch, |
1220 | .attr_count = NFQA_MAX, | |
1221 | .policy = nfqa_verdict_batch_policy }, | |
7af4cc3f HW |
1222 | }; |
1223 | ||
7c8d4cb4 | 1224 | static const struct nfnetlink_subsystem nfqnl_subsys = { |
7af4cc3f HW |
1225 | .name = "nf_queue", |
1226 | .subsys_id = NFNL_SUBSYS_QUEUE, | |
1227 | .cb_count = NFQNL_MSG_MAX, | |
7af4cc3f HW |
1228 | .cb = nfqnl_cb, |
1229 | }; | |
1230 | ||
838ab636 HW |
1231 | #ifdef CONFIG_PROC_FS |
1232 | struct iter_state { | |
e8179610 | 1233 | struct seq_net_private p; |
838ab636 HW |
1234 | unsigned int bucket; |
1235 | }; | |
1236 | ||
1237 | static struct hlist_node *get_first(struct seq_file *seq) | |
1238 | { | |
1239 | struct iter_state *st = seq->private; | |
e8179610 G |
1240 | struct net *net; |
1241 | struct nfnl_queue_net *q; | |
838ab636 HW |
1242 | |
1243 | if (!st) | |
1244 | return NULL; | |
1245 | ||
e8179610 G |
1246 | net = seq_file_net(seq); |
1247 | q = nfnl_queue_pernet(net); | |
838ab636 | 1248 | for (st->bucket = 0; st->bucket < INSTANCE_BUCKETS; st->bucket++) { |
e8179610 G |
1249 | if (!hlist_empty(&q->instance_table[st->bucket])) |
1250 | return q->instance_table[st->bucket].first; | |
838ab636 HW |
1251 | } |
1252 | return NULL; | |
1253 | } | |
1254 | ||
1255 | static struct hlist_node *get_next(struct seq_file *seq, struct hlist_node *h) | |
1256 | { | |
1257 | struct iter_state *st = seq->private; | |
e8179610 | 1258 | struct net *net = seq_file_net(seq); |
838ab636 HW |
1259 | |
1260 | h = h->next; | |
1261 | while (!h) { | |
e8179610 G |
1262 | struct nfnl_queue_net *q; |
1263 | ||
838ab636 HW |
1264 | if (++st->bucket >= INSTANCE_BUCKETS) |
1265 | return NULL; | |
1266 | ||
e8179610 G |
1267 | q = nfnl_queue_pernet(net); |
1268 | h = q->instance_table[st->bucket].first; | |
838ab636 HW |
1269 | } |
1270 | return h; | |
1271 | } | |
1272 | ||
1273 | static struct hlist_node *get_idx(struct seq_file *seq, loff_t pos) | |
1274 | { | |
1275 | struct hlist_node *head; | |
1276 | head = get_first(seq); | |
1277 | ||
1278 | if (head) | |
1279 | while (pos && (head = get_next(seq, head))) | |
1280 | pos--; | |
1281 | return pos ? NULL : head; | |
1282 | } | |
1283 | ||
e8179610 G |
1284 | static void *seq_start(struct seq_file *s, loff_t *pos) |
1285 | __acquires(nfnl_queue_pernet(seq_file_net(s))->instances_lock) | |
838ab636 | 1286 | { |
e8179610 G |
1287 | spin_lock(&nfnl_queue_pernet(seq_file_net(s))->instances_lock); |
1288 | return get_idx(s, *pos); | |
838ab636 HW |
1289 | } |
1290 | ||
1291 | static void *seq_next(struct seq_file *s, void *v, loff_t *pos) | |
1292 | { | |
1293 | (*pos)++; | |
1294 | return get_next(s, v); | |
1295 | } | |
1296 | ||
1297 | static void seq_stop(struct seq_file *s, void *v) | |
e8179610 | 1298 | __releases(nfnl_queue_pernet(seq_file_net(s))->instances_lock) |
838ab636 | 1299 | { |
e8179610 | 1300 | spin_unlock(&nfnl_queue_pernet(seq_file_net(s))->instances_lock); |
838ab636 HW |
1301 | } |
1302 | ||
1303 | static int seq_show(struct seq_file *s, void *v) | |
1304 | { | |
1305 | const struct nfqnl_instance *inst = v; | |
1306 | ||
6b46f7b7 | 1307 | seq_printf(s, "%5u %6u %5u %1u %5u %5u %5u %8u %2d\n", |
e71456ae SRRH |
1308 | inst->queue_num, |
1309 | inst->peer_portid, inst->queue_total, | |
1310 | inst->copy_mode, inst->copy_range, | |
1311 | inst->queue_dropped, inst->queue_user_dropped, | |
1312 | inst->id_sequence, 1); | |
861fb107 | 1313 | return 0; |
838ab636 HW |
1314 | } |
1315 | ||
56b3d975 | 1316 | static const struct seq_operations nfqnl_seq_ops = { |
838ab636 HW |
1317 | .start = seq_start, |
1318 | .next = seq_next, | |
1319 | .stop = seq_stop, | |
1320 | .show = seq_show, | |
1321 | }; | |
1322 | ||
1323 | static int nfqnl_open(struct inode *inode, struct file *file) | |
1324 | { | |
e8179610 | 1325 | return seq_open_net(inode, file, &nfqnl_seq_ops, |
e2da5913 | 1326 | sizeof(struct iter_state)); |
838ab636 HW |
1327 | } |
1328 | ||
da7071d7 | 1329 | static const struct file_operations nfqnl_file_ops = { |
838ab636 HW |
1330 | .owner = THIS_MODULE, |
1331 | .open = nfqnl_open, | |
1332 | .read = seq_read, | |
1333 | .llseek = seq_lseek, | |
e8179610 | 1334 | .release = seq_release_net, |
838ab636 HW |
1335 | }; |
1336 | ||
1337 | #endif /* PROC_FS */ | |
1338 | ||
e8179610 | 1339 | static int __net_init nfnl_queue_net_init(struct net *net) |
7af4cc3f | 1340 | { |
e8179610 G |
1341 | unsigned int i; |
1342 | struct nfnl_queue_net *q = nfnl_queue_pernet(net); | |
601e68e1 | 1343 | |
838ab636 | 1344 | for (i = 0; i < INSTANCE_BUCKETS; i++) |
e8179610 G |
1345 | INIT_HLIST_HEAD(&q->instance_table[i]); |
1346 | ||
1347 | spin_lock_init(&q->instances_lock); | |
1348 | ||
1349 | #ifdef CONFIG_PROC_FS | |
1350 | if (!proc_create("nfnetlink_queue", 0440, | |
1351 | net->nf.proc_netfilter, &nfqnl_file_ops)) | |
1352 | return -ENOMEM; | |
1353 | #endif | |
1354 | return 0; | |
1355 | } | |
1356 | ||
1357 | static void __net_exit nfnl_queue_net_exit(struct net *net) | |
1358 | { | |
e778f56e | 1359 | #ifdef CONFIG_PROC_FS |
e8179610 | 1360 | remove_proc_entry("nfnetlink_queue", net->nf.proc_netfilter); |
e778f56e | 1361 | #endif |
e8179610 G |
1362 | } |
1363 | ||
1364 | static struct pernet_operations nfnl_queue_net_ops = { | |
1365 | .init = nfnl_queue_net_init, | |
1366 | .exit = nfnl_queue_net_exit, | |
1367 | .id = &nfnl_queue_net_id, | |
1368 | .size = sizeof(struct nfnl_queue_net), | |
1369 | }; | |
1370 | ||
1371 | static int __init nfnetlink_queue_init(void) | |
1372 | { | |
3bfe0498 FR |
1373 | int status; |
1374 | ||
1375 | status = register_pernet_subsys(&nfnl_queue_net_ops); | |
1376 | if (status < 0) { | |
1377 | pr_err("nf_queue: failed to register pernet ops\n"); | |
1378 | goto out; | |
1379 | } | |
838ab636 | 1380 | |
7af4cc3f HW |
1381 | netlink_register_notifier(&nfqnl_rtnl_notifier); |
1382 | status = nfnetlink_subsys_register(&nfqnl_subsys); | |
1383 | if (status < 0) { | |
e8179610 | 1384 | pr_err("nf_queue: failed to create netlink socket\n"); |
7af4cc3f HW |
1385 | goto cleanup_netlink_notifier; |
1386 | } | |
1387 | ||
1388 | register_netdevice_notifier(&nfqnl_dev_notifier); | |
0360ae41 | 1389 | nf_register_queue_handler(&nfqh); |
7af4cc3f HW |
1390 | return status; |
1391 | ||
7af4cc3f HW |
1392 | cleanup_netlink_notifier: |
1393 | netlink_unregister_notifier(&nfqnl_rtnl_notifier); | |
3bfe0498 | 1394 | out: |
7af4cc3f HW |
1395 | return status; |
1396 | } | |
1397 | ||
65b4b4e8 | 1398 | static void __exit nfnetlink_queue_fini(void) |
7af4cc3f | 1399 | { |
0360ae41 | 1400 | nf_unregister_queue_handler(); |
32292a7f | 1401 | unregister_netdevice_notifier(&nfqnl_dev_notifier); |
32292a7f PM |
1402 | nfnetlink_subsys_unregister(&nfqnl_subsys); |
1403 | netlink_unregister_notifier(&nfqnl_rtnl_notifier); | |
3bfe0498 | 1404 | unregister_pernet_subsys(&nfnl_queue_net_ops); |
67137f3c JDB |
1405 | |
1406 | rcu_barrier(); /* Wait for completion of call_rcu()'s */ | |
7af4cc3f HW |
1407 | } |
1408 | ||
1409 | MODULE_DESCRIPTION("netfilter packet queue handler"); | |
1410 | MODULE_AUTHOR("Harald Welte <laforge@netfilter.org>"); | |
1411 | MODULE_LICENSE("GPL"); | |
1412 | MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_QUEUE); | |
1413 | ||
65b4b4e8 AM |
1414 | module_init(nfnetlink_queue_init); |
1415 | module_exit(nfnetlink_queue_fini); |