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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> | |
28 | #include <linux/netfilter/nfnetlink.h> | |
29 | #include <linux/netfilter/nfnetlink_queue.h> | |
30 | #include <linux/list.h> | |
31 | #include <net/sock.h> | |
c01cd429 | 32 | #include <net/netfilter/nf_queue.h> |
7af4cc3f | 33 | |
60063497 | 34 | #include <linux/atomic.h> |
7af4cc3f | 35 | |
fbcd923c HW |
36 | #ifdef CONFIG_BRIDGE_NETFILTER |
37 | #include "../bridge/br_private.h" | |
38 | #endif | |
39 | ||
7af4cc3f HW |
40 | #define NFQNL_QMAX_DEFAULT 1024 |
41 | ||
7af4cc3f HW |
42 | struct nfqnl_instance { |
43 | struct hlist_node hlist; /* global list of queues */ | |
9872bec7 | 44 | struct rcu_head rcu; |
7af4cc3f HW |
45 | |
46 | int peer_pid; | |
47 | unsigned int queue_maxlen; | |
48 | unsigned int copy_range; | |
7af4cc3f HW |
49 | unsigned int queue_dropped; |
50 | unsigned int queue_user_dropped; | |
51 | ||
7af4cc3f HW |
52 | |
53 | u_int16_t queue_num; /* number of this queue */ | |
54 | u_int8_t copy_mode; | |
c463ac97 ED |
55 | /* |
56 | * Following fields are dirtied for each queued packet, | |
57 | * keep them in same cache line if possible. | |
58 | */ | |
59 | spinlock_t lock; | |
60 | unsigned int queue_total; | |
5863702a | 61 | unsigned int id_sequence; /* 'sequence' of pkt ids */ |
7af4cc3f HW |
62 | struct list_head queue_list; /* packets in queue */ |
63 | }; | |
64 | ||
02f014d8 | 65 | typedef int (*nfqnl_cmpfn)(struct nf_queue_entry *, unsigned long); |
7af4cc3f | 66 | |
9872bec7 | 67 | static DEFINE_SPINLOCK(instances_lock); |
7af4cc3f | 68 | |
7af4cc3f | 69 | #define INSTANCE_BUCKETS 16 |
9d6023ab | 70 | static struct hlist_head instance_table[INSTANCE_BUCKETS] __read_mostly; |
7af4cc3f HW |
71 | |
72 | static inline u_int8_t instance_hashfn(u_int16_t queue_num) | |
73 | { | |
74 | return ((queue_num >> 8) | queue_num) % INSTANCE_BUCKETS; | |
75 | } | |
76 | ||
77 | static struct nfqnl_instance * | |
9872bec7 | 78 | instance_lookup(u_int16_t queue_num) |
7af4cc3f HW |
79 | { |
80 | struct hlist_head *head; | |
81 | struct hlist_node *pos; | |
82 | struct nfqnl_instance *inst; | |
83 | ||
84 | head = &instance_table[instance_hashfn(queue_num)]; | |
9872bec7 | 85 | hlist_for_each_entry_rcu(inst, pos, head, hlist) { |
7af4cc3f HW |
86 | if (inst->queue_num == queue_num) |
87 | return inst; | |
88 | } | |
89 | return NULL; | |
90 | } | |
91 | ||
7af4cc3f HW |
92 | static struct nfqnl_instance * |
93 | instance_create(u_int16_t queue_num, int pid) | |
94 | { | |
baab2ce7 | 95 | struct nfqnl_instance *inst; |
9872bec7 | 96 | unsigned int h; |
baab2ce7 | 97 | int err; |
7af4cc3f | 98 | |
9872bec7 | 99 | spin_lock(&instances_lock); |
baab2ce7 PM |
100 | if (instance_lookup(queue_num)) { |
101 | err = -EEXIST; | |
7af4cc3f | 102 | goto out_unlock; |
baab2ce7 | 103 | } |
7af4cc3f | 104 | |
10dfdc69 | 105 | inst = kzalloc(sizeof(*inst), GFP_ATOMIC); |
baab2ce7 PM |
106 | if (!inst) { |
107 | err = -ENOMEM; | |
7af4cc3f | 108 | goto out_unlock; |
baab2ce7 | 109 | } |
7af4cc3f | 110 | |
7af4cc3f HW |
111 | inst->queue_num = queue_num; |
112 | inst->peer_pid = pid; | |
113 | inst->queue_maxlen = NFQNL_QMAX_DEFAULT; | |
114 | inst->copy_range = 0xfffff; | |
115 | inst->copy_mode = NFQNL_COPY_NONE; | |
181a46a5 | 116 | spin_lock_init(&inst->lock); |
7af4cc3f HW |
117 | INIT_LIST_HEAD(&inst->queue_list); |
118 | ||
baab2ce7 PM |
119 | if (!try_module_get(THIS_MODULE)) { |
120 | err = -EAGAIN; | |
7af4cc3f | 121 | goto out_free; |
baab2ce7 | 122 | } |
7af4cc3f | 123 | |
9872bec7 PM |
124 | h = instance_hashfn(queue_num); |
125 | hlist_add_head_rcu(&inst->hlist, &instance_table[h]); | |
7af4cc3f | 126 | |
9872bec7 | 127 | spin_unlock(&instances_lock); |
7af4cc3f | 128 | |
7af4cc3f HW |
129 | return inst; |
130 | ||
131 | out_free: | |
132 | kfree(inst); | |
133 | out_unlock: | |
9872bec7 | 134 | spin_unlock(&instances_lock); |
baab2ce7 | 135 | return ERR_PTR(err); |
7af4cc3f HW |
136 | } |
137 | ||
b43d8d85 PM |
138 | static void nfqnl_flush(struct nfqnl_instance *queue, nfqnl_cmpfn cmpfn, |
139 | unsigned long data); | |
7af4cc3f HW |
140 | |
141 | static void | |
9872bec7 | 142 | instance_destroy_rcu(struct rcu_head *head) |
7af4cc3f | 143 | { |
9872bec7 PM |
144 | struct nfqnl_instance *inst = container_of(head, struct nfqnl_instance, |
145 | rcu); | |
7af4cc3f | 146 | |
b43d8d85 | 147 | nfqnl_flush(inst, NULL, 0); |
9872bec7 | 148 | kfree(inst); |
7af4cc3f HW |
149 | module_put(THIS_MODULE); |
150 | } | |
151 | ||
9872bec7 | 152 | static void |
7af4cc3f HW |
153 | __instance_destroy(struct nfqnl_instance *inst) |
154 | { | |
9872bec7 PM |
155 | hlist_del_rcu(&inst->hlist); |
156 | call_rcu(&inst->rcu, instance_destroy_rcu); | |
7af4cc3f HW |
157 | } |
158 | ||
9872bec7 | 159 | static void |
7af4cc3f HW |
160 | instance_destroy(struct nfqnl_instance *inst) |
161 | { | |
9872bec7 PM |
162 | spin_lock(&instances_lock); |
163 | __instance_destroy(inst); | |
164 | spin_unlock(&instances_lock); | |
7af4cc3f HW |
165 | } |
166 | ||
7af4cc3f | 167 | static inline void |
02f014d8 | 168 | __enqueue_entry(struct nfqnl_instance *queue, struct nf_queue_entry *entry) |
7af4cc3f | 169 | { |
0ac41e81 | 170 | list_add_tail(&entry->list, &queue->queue_list); |
7af4cc3f HW |
171 | queue->queue_total++; |
172 | } | |
173 | ||
97d32cf9 FW |
174 | static void |
175 | __dequeue_entry(struct nfqnl_instance *queue, struct nf_queue_entry *entry) | |
176 | { | |
177 | list_del(&entry->list); | |
178 | queue->queue_total--; | |
179 | } | |
180 | ||
02f014d8 | 181 | static struct nf_queue_entry * |
b43d8d85 | 182 | find_dequeue_entry(struct nfqnl_instance *queue, unsigned int id) |
7af4cc3f | 183 | { |
02f014d8 | 184 | struct nf_queue_entry *entry = NULL, *i; |
601e68e1 | 185 | |
7af4cc3f | 186 | spin_lock_bh(&queue->lock); |
b43d8d85 PM |
187 | |
188 | list_for_each_entry(i, &queue->queue_list, list) { | |
189 | if (i->id == id) { | |
190 | entry = i; | |
191 | break; | |
192 | } | |
193 | } | |
194 | ||
97d32cf9 FW |
195 | if (entry) |
196 | __dequeue_entry(queue, entry); | |
b43d8d85 | 197 | |
7af4cc3f HW |
198 | spin_unlock_bh(&queue->lock); |
199 | ||
200 | return entry; | |
201 | } | |
202 | ||
203 | static void | |
b43d8d85 | 204 | nfqnl_flush(struct nfqnl_instance *queue, nfqnl_cmpfn cmpfn, unsigned long data) |
7af4cc3f | 205 | { |
02f014d8 | 206 | struct nf_queue_entry *entry, *next; |
b43d8d85 | 207 | |
7af4cc3f | 208 | spin_lock_bh(&queue->lock); |
b43d8d85 PM |
209 | list_for_each_entry_safe(entry, next, &queue->queue_list, list) { |
210 | if (!cmpfn || cmpfn(entry, data)) { | |
211 | list_del(&entry->list); | |
212 | queue->queue_total--; | |
4b3d15ef | 213 | nf_reinject(entry, NF_DROP); |
b43d8d85 PM |
214 | } |
215 | } | |
7af4cc3f HW |
216 | spin_unlock_bh(&queue->lock); |
217 | } | |
218 | ||
219 | static struct sk_buff * | |
220 | nfqnl_build_packet_message(struct nfqnl_instance *queue, | |
5863702a ED |
221 | struct nf_queue_entry *entry, |
222 | __be32 **packet_id_ptr) | |
7af4cc3f | 223 | { |
27a884dc | 224 | sk_buff_data_t old_tail; |
7af4cc3f HW |
225 | size_t size; |
226 | size_t data_len = 0; | |
227 | struct sk_buff *skb; | |
5863702a ED |
228 | struct nlattr *nla; |
229 | struct nfqnl_msg_packet_hdr *pmsg; | |
7af4cc3f HW |
230 | struct nlmsghdr *nlh; |
231 | struct nfgenmsg *nfmsg; | |
3e4ead4f JJ |
232 | struct sk_buff *entskb = entry->skb; |
233 | struct net_device *indev; | |
234 | struct net_device *outdev; | |
7af4cc3f | 235 | |
cabaa9bf | 236 | size = NLMSG_SPACE(sizeof(struct nfgenmsg)) |
df6fb868 PM |
237 | + nla_total_size(sizeof(struct nfqnl_msg_packet_hdr)) |
238 | + nla_total_size(sizeof(u_int32_t)) /* ifindex */ | |
239 | + nla_total_size(sizeof(u_int32_t)) /* ifindex */ | |
fbcd923c | 240 | #ifdef CONFIG_BRIDGE_NETFILTER |
df6fb868 PM |
241 | + nla_total_size(sizeof(u_int32_t)) /* ifindex */ |
242 | + nla_total_size(sizeof(u_int32_t)) /* ifindex */ | |
fbcd923c | 243 | #endif |
df6fb868 PM |
244 | + nla_total_size(sizeof(u_int32_t)) /* mark */ |
245 | + nla_total_size(sizeof(struct nfqnl_msg_packet_hw)) | |
246 | + nla_total_size(sizeof(struct nfqnl_msg_packet_timestamp)); | |
7af4cc3f | 247 | |
02f014d8 | 248 | outdev = entry->outdev; |
3e4ead4f | 249 | |
c463ac97 | 250 | switch ((enum nfqnl_config_mode)ACCESS_ONCE(queue->copy_mode)) { |
7af4cc3f HW |
251 | case NFQNL_COPY_META: |
252 | case NFQNL_COPY_NONE: | |
7af4cc3f | 253 | break; |
601e68e1 | 254 | |
7af4cc3f | 255 | case NFQNL_COPY_PACKET: |
e9f13cab | 256 | if (entskb->ip_summed == CHECKSUM_PARTIAL && |
c463ac97 | 257 | skb_checksum_help(entskb)) |
e7dfb09a | 258 | return NULL; |
c463ac97 ED |
259 | |
260 | data_len = ACCESS_ONCE(queue->copy_range); | |
261 | if (data_len == 0 || data_len > entskb->len) | |
3e4ead4f | 262 | data_len = entskb->len; |
601e68e1 | 263 | |
df6fb868 | 264 | size += nla_total_size(data_len); |
7af4cc3f | 265 | break; |
7af4cc3f HW |
266 | } |
267 | ||
7af4cc3f HW |
268 | |
269 | skb = alloc_skb(size, GFP_ATOMIC); | |
270 | if (!skb) | |
271 | goto nlmsg_failure; | |
601e68e1 | 272 | |
27a884dc | 273 | old_tail = skb->tail; |
601e68e1 | 274 | nlh = NLMSG_PUT(skb, 0, 0, |
7af4cc3f HW |
275 | NFNL_SUBSYS_QUEUE << 8 | NFQNL_MSG_PACKET, |
276 | sizeof(struct nfgenmsg)); | |
277 | nfmsg = NLMSG_DATA(nlh); | |
02f014d8 | 278 | nfmsg->nfgen_family = entry->pf; |
7af4cc3f HW |
279 | nfmsg->version = NFNETLINK_V0; |
280 | nfmsg->res_id = htons(queue->queue_num); | |
281 | ||
5863702a ED |
282 | nla = __nla_reserve(skb, NFQA_PACKET_HDR, sizeof(*pmsg)); |
283 | pmsg = nla_data(nla); | |
284 | pmsg->hw_protocol = entskb->protocol; | |
285 | pmsg->hook = entry->hook; | |
286 | *packet_id_ptr = &pmsg->packet_id; | |
7af4cc3f | 287 | |
02f014d8 | 288 | indev = entry->indev; |
3e4ead4f | 289 | if (indev) { |
fbcd923c | 290 | #ifndef CONFIG_BRIDGE_NETFILTER |
ea3a66ff | 291 | NLA_PUT_BE32(skb, NFQA_IFINDEX_INDEV, htonl(indev->ifindex)); |
fbcd923c | 292 | #else |
02f014d8 | 293 | if (entry->pf == PF_BRIDGE) { |
fbcd923c | 294 | /* Case 1: indev is physical input device, we need to |
601e68e1 | 295 | * look for bridge group (when called from |
fbcd923c | 296 | * netfilter_bridge) */ |
ea3a66ff PM |
297 | NLA_PUT_BE32(skb, NFQA_IFINDEX_PHYSINDEV, |
298 | htonl(indev->ifindex)); | |
fbcd923c | 299 | /* this is the bridge group "brX" */ |
f350a0a8 | 300 | /* rcu_read_lock()ed by __nf_queue */ |
ea3a66ff | 301 | NLA_PUT_BE32(skb, NFQA_IFINDEX_INDEV, |
f350a0a8 | 302 | htonl(br_port_get_rcu(indev)->br->dev->ifindex)); |
fbcd923c HW |
303 | } else { |
304 | /* Case 2: indev is bridge group, we need to look for | |
305 | * physical device (when called from ipv4) */ | |
ea3a66ff PM |
306 | NLA_PUT_BE32(skb, NFQA_IFINDEX_INDEV, |
307 | htonl(indev->ifindex)); | |
308 | if (entskb->nf_bridge && entskb->nf_bridge->physindev) | |
309 | NLA_PUT_BE32(skb, NFQA_IFINDEX_PHYSINDEV, | |
310 | htonl(entskb->nf_bridge->physindev->ifindex)); | |
fbcd923c HW |
311 | } |
312 | #endif | |
7af4cc3f HW |
313 | } |
314 | ||
3e4ead4f | 315 | if (outdev) { |
fbcd923c | 316 | #ifndef CONFIG_BRIDGE_NETFILTER |
ea3a66ff | 317 | NLA_PUT_BE32(skb, NFQA_IFINDEX_OUTDEV, htonl(outdev->ifindex)); |
fbcd923c | 318 | #else |
02f014d8 | 319 | if (entry->pf == PF_BRIDGE) { |
fbcd923c | 320 | /* Case 1: outdev is physical output device, we need to |
601e68e1 | 321 | * look for bridge group (when called from |
fbcd923c | 322 | * netfilter_bridge) */ |
ea3a66ff PM |
323 | NLA_PUT_BE32(skb, NFQA_IFINDEX_PHYSOUTDEV, |
324 | htonl(outdev->ifindex)); | |
fbcd923c | 325 | /* this is the bridge group "brX" */ |
f350a0a8 | 326 | /* rcu_read_lock()ed by __nf_queue */ |
ea3a66ff | 327 | NLA_PUT_BE32(skb, NFQA_IFINDEX_OUTDEV, |
f350a0a8 | 328 | htonl(br_port_get_rcu(outdev)->br->dev->ifindex)); |
fbcd923c HW |
329 | } else { |
330 | /* Case 2: outdev is bridge group, we need to look for | |
331 | * physical output device (when called from ipv4) */ | |
ea3a66ff PM |
332 | NLA_PUT_BE32(skb, NFQA_IFINDEX_OUTDEV, |
333 | htonl(outdev->ifindex)); | |
334 | if (entskb->nf_bridge && entskb->nf_bridge->physoutdev) | |
335 | NLA_PUT_BE32(skb, NFQA_IFINDEX_PHYSOUTDEV, | |
336 | htonl(entskb->nf_bridge->physoutdev->ifindex)); | |
fbcd923c HW |
337 | } |
338 | #endif | |
7af4cc3f HW |
339 | } |
340 | ||
ea3a66ff PM |
341 | if (entskb->mark) |
342 | NLA_PUT_BE32(skb, NFQA_MARK, htonl(entskb->mark)); | |
7af4cc3f | 343 | |
2c38de4c NC |
344 | if (indev && entskb->dev && |
345 | entskb->mac_header != entskb->network_header) { | |
7af4cc3f | 346 | struct nfqnl_msg_packet_hw phw; |
b95cce35 SH |
347 | int len = dev_parse_header(entskb, phw.hw_addr); |
348 | if (len) { | |
349 | phw.hw_addrlen = htons(len); | |
df6fb868 | 350 | NLA_PUT(skb, NFQA_HWADDR, sizeof(phw), &phw); |
b95cce35 | 351 | } |
7af4cc3f HW |
352 | } |
353 | ||
b7aa0bf7 | 354 | if (entskb->tstamp.tv64) { |
7af4cc3f | 355 | struct nfqnl_msg_packet_timestamp ts; |
b7aa0bf7 ED |
356 | struct timeval tv = ktime_to_timeval(entskb->tstamp); |
357 | ts.sec = cpu_to_be64(tv.tv_sec); | |
358 | ts.usec = cpu_to_be64(tv.tv_usec); | |
7af4cc3f | 359 | |
df6fb868 | 360 | NLA_PUT(skb, NFQA_TIMESTAMP, sizeof(ts), &ts); |
7af4cc3f HW |
361 | } |
362 | ||
363 | if (data_len) { | |
df6fb868 | 364 | struct nlattr *nla; |
ca7c48ca | 365 | int sz = nla_attr_size(data_len); |
7af4cc3f | 366 | |
df6fb868 | 367 | if (skb_tailroom(skb) < nla_total_size(data_len)) { |
7af4cc3f HW |
368 | printk(KERN_WARNING "nf_queue: no tailroom!\n"); |
369 | goto nlmsg_failure; | |
370 | } | |
371 | ||
df6fb868 PM |
372 | nla = (struct nlattr *)skb_put(skb, nla_total_size(data_len)); |
373 | nla->nla_type = NFQA_PAYLOAD; | |
ca7c48ca | 374 | nla->nla_len = sz; |
7af4cc3f | 375 | |
df6fb868 | 376 | if (skb_copy_bits(entskb, 0, nla_data(nla), data_len)) |
7af4cc3f HW |
377 | BUG(); |
378 | } | |
601e68e1 | 379 | |
7af4cc3f HW |
380 | nlh->nlmsg_len = skb->tail - old_tail; |
381 | return skb; | |
382 | ||
383 | nlmsg_failure: | |
df6fb868 | 384 | nla_put_failure: |
7af4cc3f HW |
385 | if (skb) |
386 | kfree_skb(skb); | |
7af4cc3f HW |
387 | if (net_ratelimit()) |
388 | printk(KERN_ERR "nf_queue: error creating packet message\n"); | |
389 | return NULL; | |
390 | } | |
391 | ||
392 | static int | |
02f014d8 | 393 | nfqnl_enqueue_packet(struct nf_queue_entry *entry, unsigned int queuenum) |
7af4cc3f | 394 | { |
7af4cc3f HW |
395 | struct sk_buff *nskb; |
396 | struct nfqnl_instance *queue; | |
f1585086 | 397 | int err = -ENOBUFS; |
5863702a | 398 | __be32 *packet_id_ptr; |
7af4cc3f | 399 | |
9872bec7 PM |
400 | /* rcu_read_lock()ed by nf_hook_slow() */ |
401 | queue = instance_lookup(queuenum); | |
f1585086 FW |
402 | if (!queue) { |
403 | err = -ESRCH; | |
0ef0f465 | 404 | goto err_out; |
f1585086 | 405 | } |
7af4cc3f | 406 | |
f1585086 FW |
407 | if (queue->copy_mode == NFQNL_COPY_NONE) { |
408 | err = -EINVAL; | |
0ef0f465 | 409 | goto err_out; |
f1585086 | 410 | } |
7af4cc3f | 411 | |
5863702a | 412 | nskb = nfqnl_build_packet_message(queue, entry, &packet_id_ptr); |
f1585086 FW |
413 | if (nskb == NULL) { |
414 | err = -ENOMEM; | |
0ef0f465 | 415 | goto err_out; |
f1585086 | 416 | } |
7af4cc3f | 417 | spin_lock_bh(&queue->lock); |
601e68e1 | 418 | |
f1585086 FW |
419 | if (!queue->peer_pid) { |
420 | err = -EINVAL; | |
601e68e1 | 421 | goto err_out_free_nskb; |
f1585086 | 422 | } |
7af4cc3f | 423 | if (queue->queue_total >= queue->queue_maxlen) { |
601e68e1 | 424 | queue->queue_dropped++; |
7af4cc3f | 425 | if (net_ratelimit()) |
601e68e1 | 426 | printk(KERN_WARNING "nf_queue: full at %d entries, " |
a5d896ad EL |
427 | "dropping packets(s).\n", |
428 | queue->queue_total); | |
7af4cc3f HW |
429 | goto err_out_free_nskb; |
430 | } | |
5863702a ED |
431 | entry->id = ++queue->id_sequence; |
432 | *packet_id_ptr = htonl(entry->id); | |
7af4cc3f HW |
433 | |
434 | /* nfnetlink_unicast will either free the nskb or add it to a socket */ | |
cd8c20b6 | 435 | err = nfnetlink_unicast(nskb, &init_net, queue->peer_pid, MSG_DONTWAIT); |
0ef0f465 | 436 | if (err < 0) { |
601e68e1 | 437 | queue->queue_user_dropped++; |
7af4cc3f HW |
438 | goto err_out_unlock; |
439 | } | |
440 | ||
441 | __enqueue_entry(queue, entry); | |
442 | ||
443 | spin_unlock_bh(&queue->lock); | |
0ef0f465 | 444 | return 0; |
7af4cc3f HW |
445 | |
446 | err_out_free_nskb: | |
601e68e1 | 447 | kfree_skb(nskb); |
7af4cc3f HW |
448 | err_out_unlock: |
449 | spin_unlock_bh(&queue->lock); | |
0ef0f465 | 450 | err_out: |
f1585086 | 451 | return err; |
7af4cc3f HW |
452 | } |
453 | ||
454 | static int | |
02f014d8 | 455 | nfqnl_mangle(void *data, int data_len, struct nf_queue_entry *e) |
7af4cc3f | 456 | { |
e2b58a67 | 457 | struct sk_buff *nskb; |
7af4cc3f HW |
458 | int diff; |
459 | ||
460 | diff = data_len - e->skb->len; | |
d8a585d7 PM |
461 | if (diff < 0) { |
462 | if (pskb_trim(e->skb, data_len)) | |
463 | return -ENOMEM; | |
464 | } else if (diff > 0) { | |
7af4cc3f HW |
465 | if (data_len > 0xFFFF) |
466 | return -EINVAL; | |
467 | if (diff > skb_tailroom(e->skb)) { | |
9a732ed6 AE |
468 | nskb = skb_copy_expand(e->skb, skb_headroom(e->skb), |
469 | diff, GFP_ATOMIC); | |
e2b58a67 | 470 | if (!nskb) { |
1158ba27 | 471 | printk(KERN_WARNING "nf_queue: OOM " |
7af4cc3f | 472 | "in mangle, dropping packet\n"); |
e2b58a67 | 473 | return -ENOMEM; |
7af4cc3f | 474 | } |
e2b58a67 PM |
475 | kfree_skb(e->skb); |
476 | e->skb = nskb; | |
7af4cc3f HW |
477 | } |
478 | skb_put(e->skb, diff); | |
479 | } | |
37d41879 | 480 | if (!skb_make_writable(e->skb, data_len)) |
7af4cc3f | 481 | return -ENOMEM; |
27d7ff46 | 482 | skb_copy_to_linear_data(e->skb, data, data_len); |
e7dfb09a | 483 | e->skb->ip_summed = CHECKSUM_NONE; |
7af4cc3f HW |
484 | return 0; |
485 | } | |
486 | ||
7af4cc3f HW |
487 | static int |
488 | nfqnl_set_mode(struct nfqnl_instance *queue, | |
489 | unsigned char mode, unsigned int range) | |
490 | { | |
c5de0dfd | 491 | int status = 0; |
7af4cc3f HW |
492 | |
493 | spin_lock_bh(&queue->lock); | |
c5de0dfd PM |
494 | switch (mode) { |
495 | case NFQNL_COPY_NONE: | |
496 | case NFQNL_COPY_META: | |
497 | queue->copy_mode = mode; | |
498 | queue->copy_range = 0; | |
499 | break; | |
500 | ||
501 | case NFQNL_COPY_PACKET: | |
502 | queue->copy_mode = mode; | |
503 | /* we're using struct nlattr which has 16bit nla_len */ | |
504 | if (range > 0xffff) | |
505 | queue->copy_range = 0xffff; | |
506 | else | |
507 | queue->copy_range = range; | |
508 | break; | |
509 | ||
510 | default: | |
511 | status = -EINVAL; | |
512 | ||
513 | } | |
7af4cc3f HW |
514 | spin_unlock_bh(&queue->lock); |
515 | ||
516 | return status; | |
517 | } | |
518 | ||
519 | static int | |
02f014d8 | 520 | dev_cmp(struct nf_queue_entry *entry, unsigned long ifindex) |
7af4cc3f | 521 | { |
02f014d8 PM |
522 | if (entry->indev) |
523 | if (entry->indev->ifindex == ifindex) | |
7af4cc3f | 524 | return 1; |
02f014d8 PM |
525 | if (entry->outdev) |
526 | if (entry->outdev->ifindex == ifindex) | |
7af4cc3f | 527 | return 1; |
ef47c6a7 PM |
528 | #ifdef CONFIG_BRIDGE_NETFILTER |
529 | if (entry->skb->nf_bridge) { | |
530 | if (entry->skb->nf_bridge->physindev && | |
531 | entry->skb->nf_bridge->physindev->ifindex == ifindex) | |
532 | return 1; | |
533 | if (entry->skb->nf_bridge->physoutdev && | |
534 | entry->skb->nf_bridge->physoutdev->ifindex == ifindex) | |
535 | return 1; | |
536 | } | |
537 | #endif | |
7af4cc3f HW |
538 | return 0; |
539 | } | |
540 | ||
541 | /* drop all packets with either indev or outdev == ifindex from all queue | |
542 | * instances */ | |
543 | static void | |
544 | nfqnl_dev_drop(int ifindex) | |
545 | { | |
546 | int i; | |
601e68e1 | 547 | |
9872bec7 | 548 | rcu_read_lock(); |
7af4cc3f | 549 | |
9872bec7 | 550 | for (i = 0; i < INSTANCE_BUCKETS; i++) { |
7af4cc3f HW |
551 | struct hlist_node *tmp; |
552 | struct nfqnl_instance *inst; | |
553 | struct hlist_head *head = &instance_table[i]; | |
554 | ||
9872bec7 | 555 | hlist_for_each_entry_rcu(inst, tmp, head, hlist) |
b43d8d85 | 556 | nfqnl_flush(inst, dev_cmp, ifindex); |
7af4cc3f HW |
557 | } |
558 | ||
9872bec7 | 559 | rcu_read_unlock(); |
7af4cc3f HW |
560 | } |
561 | ||
562 | #define RCV_SKB_FAIL(err) do { netlink_ack(skb, nlh, (err)); return; } while (0) | |
563 | ||
564 | static int | |
565 | nfqnl_rcv_dev_event(struct notifier_block *this, | |
566 | unsigned long event, void *ptr) | |
567 | { | |
568 | struct net_device *dev = ptr; | |
569 | ||
721499e8 | 570 | if (!net_eq(dev_net(dev), &init_net)) |
e9dc8653 EB |
571 | return NOTIFY_DONE; |
572 | ||
7af4cc3f HW |
573 | /* Drop any packets associated with the downed device */ |
574 | if (event == NETDEV_DOWN) | |
575 | nfqnl_dev_drop(dev->ifindex); | |
576 | return NOTIFY_DONE; | |
577 | } | |
578 | ||
579 | static struct notifier_block nfqnl_dev_notifier = { | |
580 | .notifier_call = nfqnl_rcv_dev_event, | |
581 | }; | |
582 | ||
583 | static int | |
584 | nfqnl_rcv_nl_event(struct notifier_block *this, | |
585 | unsigned long event, void *ptr) | |
586 | { | |
587 | struct netlink_notify *n = ptr; | |
588 | ||
dee5817e | 589 | if (event == NETLINK_URELEASE && n->protocol == NETLINK_NETFILTER) { |
7af4cc3f HW |
590 | int i; |
591 | ||
592 | /* destroy all instances for this pid */ | |
9872bec7 PM |
593 | spin_lock(&instances_lock); |
594 | for (i = 0; i < INSTANCE_BUCKETS; i++) { | |
7af4cc3f HW |
595 | struct hlist_node *tmp, *t2; |
596 | struct nfqnl_instance *inst; | |
597 | struct hlist_head *head = &instance_table[i]; | |
598 | ||
599 | hlist_for_each_entry_safe(inst, tmp, t2, head, hlist) { | |
b4b51029 EB |
600 | if ((n->net == &init_net) && |
601 | (n->pid == inst->peer_pid)) | |
7af4cc3f HW |
602 | __instance_destroy(inst); |
603 | } | |
604 | } | |
9872bec7 | 605 | spin_unlock(&instances_lock); |
7af4cc3f HW |
606 | } |
607 | return NOTIFY_DONE; | |
608 | } | |
609 | ||
610 | static struct notifier_block nfqnl_rtnl_notifier = { | |
611 | .notifier_call = nfqnl_rcv_nl_event, | |
612 | }; | |
613 | ||
5bf75853 PM |
614 | static const struct nla_policy nfqa_verdict_policy[NFQA_MAX+1] = { |
615 | [NFQA_VERDICT_HDR] = { .len = sizeof(struct nfqnl_msg_verdict_hdr) }, | |
616 | [NFQA_MARK] = { .type = NLA_U32 }, | |
617 | [NFQA_PAYLOAD] = { .type = NLA_UNSPEC }, | |
838ab636 HW |
618 | }; |
619 | ||
97d32cf9 FW |
620 | static const struct nla_policy nfqa_verdict_batch_policy[NFQA_MAX+1] = { |
621 | [NFQA_VERDICT_HDR] = { .len = sizeof(struct nfqnl_msg_verdict_hdr) }, | |
622 | [NFQA_MARK] = { .type = NLA_U32 }, | |
623 | }; | |
624 | ||
625 | static struct nfqnl_instance *verdict_instance_lookup(u16 queue_num, int nlpid) | |
626 | { | |
627 | struct nfqnl_instance *queue; | |
628 | ||
629 | queue = instance_lookup(queue_num); | |
630 | if (!queue) | |
631 | return ERR_PTR(-ENODEV); | |
632 | ||
633 | if (queue->peer_pid != nlpid) | |
634 | return ERR_PTR(-EPERM); | |
635 | ||
636 | return queue; | |
637 | } | |
638 | ||
639 | static struct nfqnl_msg_verdict_hdr* | |
640 | verdicthdr_get(const struct nlattr * const nfqa[]) | |
641 | { | |
642 | struct nfqnl_msg_verdict_hdr *vhdr; | |
643 | unsigned int verdict; | |
644 | ||
645 | if (!nfqa[NFQA_VERDICT_HDR]) | |
646 | return NULL; | |
647 | ||
648 | vhdr = nla_data(nfqa[NFQA_VERDICT_HDR]); | |
c6675233 FW |
649 | verdict = ntohl(vhdr->verdict) & NF_VERDICT_MASK; |
650 | if (verdict > NF_MAX_VERDICT || verdict == NF_STOLEN) | |
97d32cf9 FW |
651 | return NULL; |
652 | return vhdr; | |
653 | } | |
654 | ||
655 | static int nfq_id_after(unsigned int id, unsigned int max) | |
656 | { | |
657 | return (int)(id - max) > 0; | |
658 | } | |
659 | ||
660 | static int | |
661 | nfqnl_recv_verdict_batch(struct sock *ctnl, struct sk_buff *skb, | |
662 | const struct nlmsghdr *nlh, | |
663 | const struct nlattr * const nfqa[]) | |
664 | { | |
665 | struct nfgenmsg *nfmsg = NLMSG_DATA(nlh); | |
666 | struct nf_queue_entry *entry, *tmp; | |
667 | unsigned int verdict, maxid; | |
668 | struct nfqnl_msg_verdict_hdr *vhdr; | |
669 | struct nfqnl_instance *queue; | |
670 | LIST_HEAD(batch_list); | |
671 | u16 queue_num = ntohs(nfmsg->res_id); | |
672 | ||
673 | queue = verdict_instance_lookup(queue_num, NETLINK_CB(skb).pid); | |
674 | if (IS_ERR(queue)) | |
675 | return PTR_ERR(queue); | |
676 | ||
677 | vhdr = verdicthdr_get(nfqa); | |
678 | if (!vhdr) | |
679 | return -EINVAL; | |
680 | ||
681 | verdict = ntohl(vhdr->verdict); | |
682 | maxid = ntohl(vhdr->id); | |
683 | ||
684 | spin_lock_bh(&queue->lock); | |
685 | ||
686 | list_for_each_entry_safe(entry, tmp, &queue->queue_list, list) { | |
687 | if (nfq_id_after(entry->id, maxid)) | |
688 | break; | |
689 | __dequeue_entry(queue, entry); | |
690 | list_add_tail(&entry->list, &batch_list); | |
691 | } | |
692 | ||
693 | spin_unlock_bh(&queue->lock); | |
694 | ||
695 | if (list_empty(&batch_list)) | |
696 | return -ENOENT; | |
697 | ||
698 | list_for_each_entry_safe(entry, tmp, &batch_list, list) { | |
699 | if (nfqa[NFQA_MARK]) | |
700 | entry->skb->mark = ntohl(nla_get_be32(nfqa[NFQA_MARK])); | |
701 | nf_reinject(entry, verdict); | |
702 | } | |
703 | return 0; | |
704 | } | |
705 | ||
7af4cc3f HW |
706 | static int |
707 | nfqnl_recv_verdict(struct sock *ctnl, struct sk_buff *skb, | |
39938324 PM |
708 | const struct nlmsghdr *nlh, |
709 | const struct nlattr * const nfqa[]) | |
7af4cc3f HW |
710 | { |
711 | struct nfgenmsg *nfmsg = NLMSG_DATA(nlh); | |
712 | u_int16_t queue_num = ntohs(nfmsg->res_id); | |
713 | ||
714 | struct nfqnl_msg_verdict_hdr *vhdr; | |
715 | struct nfqnl_instance *queue; | |
716 | unsigned int verdict; | |
02f014d8 | 717 | struct nf_queue_entry *entry; |
7af4cc3f | 718 | |
9872bec7 | 719 | queue = instance_lookup(queue_num); |
84a797dd | 720 | if (!queue) |
7af4cc3f | 721 | |
97d32cf9 FW |
722 | queue = verdict_instance_lookup(queue_num, NETLINK_CB(skb).pid); |
723 | if (IS_ERR(queue)) | |
724 | return PTR_ERR(queue); | |
7af4cc3f | 725 | |
97d32cf9 FW |
726 | vhdr = verdicthdr_get(nfqa); |
727 | if (!vhdr) | |
84a797dd | 728 | return -EINVAL; |
7af4cc3f | 729 | |
7af4cc3f HW |
730 | verdict = ntohl(vhdr->verdict); |
731 | ||
b43d8d85 | 732 | entry = find_dequeue_entry(queue, ntohl(vhdr->id)); |
84a797dd ED |
733 | if (entry == NULL) |
734 | return -ENOENT; | |
7af4cc3f | 735 | |
df6fb868 PM |
736 | if (nfqa[NFQA_PAYLOAD]) { |
737 | if (nfqnl_mangle(nla_data(nfqa[NFQA_PAYLOAD]), | |
738 | nla_len(nfqa[NFQA_PAYLOAD]), entry) < 0) | |
7af4cc3f HW |
739 | verdict = NF_DROP; |
740 | } | |
741 | ||
df6fb868 | 742 | if (nfqa[NFQA_MARK]) |
ea3a66ff | 743 | entry->skb->mark = ntohl(nla_get_be32(nfqa[NFQA_MARK])); |
601e68e1 | 744 | |
4b3d15ef | 745 | nf_reinject(entry, verdict); |
7af4cc3f HW |
746 | return 0; |
747 | } | |
748 | ||
749 | static int | |
750 | nfqnl_recv_unsupp(struct sock *ctnl, struct sk_buff *skb, | |
39938324 PM |
751 | const struct nlmsghdr *nlh, |
752 | const struct nlattr * const nfqa[]) | |
7af4cc3f HW |
753 | { |
754 | return -ENOTSUPP; | |
755 | } | |
756 | ||
5bf75853 PM |
757 | static const struct nla_policy nfqa_cfg_policy[NFQA_CFG_MAX+1] = { |
758 | [NFQA_CFG_CMD] = { .len = sizeof(struct nfqnl_msg_config_cmd) }, | |
759 | [NFQA_CFG_PARAMS] = { .len = sizeof(struct nfqnl_msg_config_params) }, | |
838ab636 HW |
760 | }; |
761 | ||
e3ac5298 | 762 | static const struct nf_queue_handler nfqh = { |
bbd86b9f HW |
763 | .name = "nf_queue", |
764 | .outfn = &nfqnl_enqueue_packet, | |
765 | }; | |
766 | ||
7af4cc3f HW |
767 | static int |
768 | nfqnl_recv_config(struct sock *ctnl, struct sk_buff *skb, | |
39938324 PM |
769 | const struct nlmsghdr *nlh, |
770 | const struct nlattr * const nfqa[]) | |
7af4cc3f HW |
771 | { |
772 | struct nfgenmsg *nfmsg = NLMSG_DATA(nlh); | |
773 | u_int16_t queue_num = ntohs(nfmsg->res_id); | |
774 | struct nfqnl_instance *queue; | |
9872bec7 | 775 | struct nfqnl_msg_config_cmd *cmd = NULL; |
838ab636 | 776 | int ret = 0; |
7af4cc3f | 777 | |
9872bec7 PM |
778 | if (nfqa[NFQA_CFG_CMD]) { |
779 | cmd = nla_data(nfqa[NFQA_CFG_CMD]); | |
780 | ||
781 | /* Commands without queue context - might sleep */ | |
782 | switch (cmd->command) { | |
783 | case NFQNL_CFG_CMD_PF_BIND: | |
914afea8 PM |
784 | return nf_register_queue_handler(ntohs(cmd->pf), |
785 | &nfqh); | |
9872bec7 | 786 | case NFQNL_CFG_CMD_PF_UNBIND: |
914afea8 PM |
787 | return nf_unregister_queue_handler(ntohs(cmd->pf), |
788 | &nfqh); | |
9872bec7 | 789 | } |
9872bec7 PM |
790 | } |
791 | ||
792 | rcu_read_lock(); | |
793 | queue = instance_lookup(queue_num); | |
a3c8e7fd PM |
794 | if (queue && queue->peer_pid != NETLINK_CB(skb).pid) { |
795 | ret = -EPERM; | |
9872bec7 | 796 | goto err_out_unlock; |
a3c8e7fd PM |
797 | } |
798 | ||
9872bec7 | 799 | if (cmd != NULL) { |
7af4cc3f HW |
800 | switch (cmd->command) { |
801 | case NFQNL_CFG_CMD_BIND: | |
9872bec7 PM |
802 | if (queue) { |
803 | ret = -EBUSY; | |
804 | goto err_out_unlock; | |
805 | } | |
7af4cc3f | 806 | queue = instance_create(queue_num, NETLINK_CB(skb).pid); |
baab2ce7 PM |
807 | if (IS_ERR(queue)) { |
808 | ret = PTR_ERR(queue); | |
9872bec7 PM |
809 | goto err_out_unlock; |
810 | } | |
7af4cc3f HW |
811 | break; |
812 | case NFQNL_CFG_CMD_UNBIND: | |
9872bec7 PM |
813 | if (!queue) { |
814 | ret = -ENODEV; | |
815 | goto err_out_unlock; | |
816 | } | |
7af4cc3f HW |
817 | instance_destroy(queue); |
818 | break; | |
819 | case NFQNL_CFG_CMD_PF_BIND: | |
7af4cc3f | 820 | case NFQNL_CFG_CMD_PF_UNBIND: |
7af4cc3f HW |
821 | break; |
822 | default: | |
cd21f0ac | 823 | ret = -ENOTSUPP; |
838ab636 | 824 | break; |
7af4cc3f | 825 | } |
7af4cc3f HW |
826 | } |
827 | ||
df6fb868 | 828 | if (nfqa[NFQA_CFG_PARAMS]) { |
7af4cc3f | 829 | struct nfqnl_msg_config_params *params; |
7af4cc3f | 830 | |
406dbfc9 | 831 | if (!queue) { |
a3c8e7fd | 832 | ret = -ENODEV; |
9872bec7 | 833 | goto err_out_unlock; |
406dbfc9 | 834 | } |
df6fb868 | 835 | params = nla_data(nfqa[NFQA_CFG_PARAMS]); |
7af4cc3f HW |
836 | nfqnl_set_mode(queue, params->copy_mode, |
837 | ntohl(params->copy_range)); | |
838 | } | |
839 | ||
df6fb868 | 840 | if (nfqa[NFQA_CFG_QUEUE_MAXLEN]) { |
829e17a1 | 841 | __be32 *queue_maxlen; |
a3c8e7fd PM |
842 | |
843 | if (!queue) { | |
844 | ret = -ENODEV; | |
9872bec7 | 845 | goto err_out_unlock; |
a3c8e7fd | 846 | } |
df6fb868 | 847 | queue_maxlen = nla_data(nfqa[NFQA_CFG_QUEUE_MAXLEN]); |
829e17a1 EL |
848 | spin_lock_bh(&queue->lock); |
849 | queue->queue_maxlen = ntohl(*queue_maxlen); | |
850 | spin_unlock_bh(&queue->lock); | |
851 | } | |
852 | ||
9872bec7 PM |
853 | err_out_unlock: |
854 | rcu_read_unlock(); | |
838ab636 | 855 | return ret; |
7af4cc3f HW |
856 | } |
857 | ||
7c8d4cb4 | 858 | static const struct nfnl_callback nfqnl_cb[NFQNL_MSG_MAX] = { |
84a797dd | 859 | [NFQNL_MSG_PACKET] = { .call_rcu = nfqnl_recv_unsupp, |
37d2e7a2 | 860 | .attr_count = NFQA_MAX, }, |
84a797dd | 861 | [NFQNL_MSG_VERDICT] = { .call_rcu = nfqnl_recv_verdict, |
5bf75853 PM |
862 | .attr_count = NFQA_MAX, |
863 | .policy = nfqa_verdict_policy }, | |
7af4cc3f | 864 | [NFQNL_MSG_CONFIG] = { .call = nfqnl_recv_config, |
5bf75853 PM |
865 | .attr_count = NFQA_CFG_MAX, |
866 | .policy = nfqa_cfg_policy }, | |
97d32cf9 FW |
867 | [NFQNL_MSG_VERDICT_BATCH]={ .call_rcu = nfqnl_recv_verdict_batch, |
868 | .attr_count = NFQA_MAX, | |
869 | .policy = nfqa_verdict_batch_policy }, | |
7af4cc3f HW |
870 | }; |
871 | ||
7c8d4cb4 | 872 | static const struct nfnetlink_subsystem nfqnl_subsys = { |
7af4cc3f HW |
873 | .name = "nf_queue", |
874 | .subsys_id = NFNL_SUBSYS_QUEUE, | |
875 | .cb_count = NFQNL_MSG_MAX, | |
7af4cc3f HW |
876 | .cb = nfqnl_cb, |
877 | }; | |
878 | ||
838ab636 HW |
879 | #ifdef CONFIG_PROC_FS |
880 | struct iter_state { | |
881 | unsigned int bucket; | |
882 | }; | |
883 | ||
884 | static struct hlist_node *get_first(struct seq_file *seq) | |
885 | { | |
886 | struct iter_state *st = seq->private; | |
887 | ||
888 | if (!st) | |
889 | return NULL; | |
890 | ||
891 | for (st->bucket = 0; st->bucket < INSTANCE_BUCKETS; st->bucket++) { | |
892 | if (!hlist_empty(&instance_table[st->bucket])) | |
893 | return instance_table[st->bucket].first; | |
894 | } | |
895 | return NULL; | |
896 | } | |
897 | ||
898 | static struct hlist_node *get_next(struct seq_file *seq, struct hlist_node *h) | |
899 | { | |
900 | struct iter_state *st = seq->private; | |
901 | ||
902 | h = h->next; | |
903 | while (!h) { | |
904 | if (++st->bucket >= INSTANCE_BUCKETS) | |
905 | return NULL; | |
906 | ||
907 | h = instance_table[st->bucket].first; | |
908 | } | |
909 | return h; | |
910 | } | |
911 | ||
912 | static struct hlist_node *get_idx(struct seq_file *seq, loff_t pos) | |
913 | { | |
914 | struct hlist_node *head; | |
915 | head = get_first(seq); | |
916 | ||
917 | if (head) | |
918 | while (pos && (head = get_next(seq, head))) | |
919 | pos--; | |
920 | return pos ? NULL : head; | |
921 | } | |
922 | ||
923 | static void *seq_start(struct seq_file *seq, loff_t *pos) | |
ca7c48ca | 924 | __acquires(instances_lock) |
838ab636 | 925 | { |
9872bec7 | 926 | spin_lock(&instances_lock); |
838ab636 HW |
927 | return get_idx(seq, *pos); |
928 | } | |
929 | ||
930 | static void *seq_next(struct seq_file *s, void *v, loff_t *pos) | |
931 | { | |
932 | (*pos)++; | |
933 | return get_next(s, v); | |
934 | } | |
935 | ||
936 | static void seq_stop(struct seq_file *s, void *v) | |
ca7c48ca | 937 | __releases(instances_lock) |
838ab636 | 938 | { |
9872bec7 | 939 | spin_unlock(&instances_lock); |
838ab636 HW |
940 | } |
941 | ||
942 | static int seq_show(struct seq_file *s, void *v) | |
943 | { | |
944 | const struct nfqnl_instance *inst = v; | |
945 | ||
946 | return seq_printf(s, "%5d %6d %5d %1d %5d %5d %5d %8d %2d\n", | |
947 | inst->queue_num, | |
948 | inst->peer_pid, inst->queue_total, | |
949 | inst->copy_mode, inst->copy_range, | |
950 | inst->queue_dropped, inst->queue_user_dropped, | |
5863702a | 951 | inst->id_sequence, 1); |
838ab636 HW |
952 | } |
953 | ||
56b3d975 | 954 | static const struct seq_operations nfqnl_seq_ops = { |
838ab636 HW |
955 | .start = seq_start, |
956 | .next = seq_next, | |
957 | .stop = seq_stop, | |
958 | .show = seq_show, | |
959 | }; | |
960 | ||
961 | static int nfqnl_open(struct inode *inode, struct file *file) | |
962 | { | |
e2da5913 PE |
963 | return seq_open_private(file, &nfqnl_seq_ops, |
964 | sizeof(struct iter_state)); | |
838ab636 HW |
965 | } |
966 | ||
da7071d7 | 967 | static const struct file_operations nfqnl_file_ops = { |
838ab636 HW |
968 | .owner = THIS_MODULE, |
969 | .open = nfqnl_open, | |
970 | .read = seq_read, | |
971 | .llseek = seq_lseek, | |
972 | .release = seq_release_private, | |
973 | }; | |
974 | ||
975 | #endif /* PROC_FS */ | |
976 | ||
32292a7f | 977 | static int __init nfnetlink_queue_init(void) |
7af4cc3f | 978 | { |
838ab636 | 979 | int i, status = -ENOMEM; |
601e68e1 | 980 | |
838ab636 HW |
981 | for (i = 0; i < INSTANCE_BUCKETS; i++) |
982 | INIT_HLIST_HEAD(&instance_table[i]); | |
983 | ||
7af4cc3f HW |
984 | netlink_register_notifier(&nfqnl_rtnl_notifier); |
985 | status = nfnetlink_subsys_register(&nfqnl_subsys); | |
986 | if (status < 0) { | |
987 | printk(KERN_ERR "nf_queue: failed to create netlink socket\n"); | |
988 | goto cleanup_netlink_notifier; | |
989 | } | |
990 | ||
838ab636 | 991 | #ifdef CONFIG_PROC_FS |
8eeee8b1 DL |
992 | if (!proc_create("nfnetlink_queue", 0440, |
993 | proc_net_netfilter, &nfqnl_file_ops)) | |
838ab636 | 994 | goto cleanup_subsys; |
838ab636 HW |
995 | #endif |
996 | ||
7af4cc3f HW |
997 | register_netdevice_notifier(&nfqnl_dev_notifier); |
998 | return status; | |
999 | ||
838ab636 HW |
1000 | #ifdef CONFIG_PROC_FS |
1001 | cleanup_subsys: | |
7af4cc3f | 1002 | nfnetlink_subsys_unregister(&nfqnl_subsys); |
32292a7f | 1003 | #endif |
7af4cc3f HW |
1004 | cleanup_netlink_notifier: |
1005 | netlink_unregister_notifier(&nfqnl_rtnl_notifier); | |
1006 | return status; | |
1007 | } | |
1008 | ||
65b4b4e8 | 1009 | static void __exit nfnetlink_queue_fini(void) |
7af4cc3f | 1010 | { |
32292a7f PM |
1011 | nf_unregister_queue_handlers(&nfqh); |
1012 | unregister_netdevice_notifier(&nfqnl_dev_notifier); | |
1013 | #ifdef CONFIG_PROC_FS | |
1014 | remove_proc_entry("nfnetlink_queue", proc_net_netfilter); | |
1015 | #endif | |
1016 | nfnetlink_subsys_unregister(&nfqnl_subsys); | |
1017 | netlink_unregister_notifier(&nfqnl_rtnl_notifier); | |
67137f3c JDB |
1018 | |
1019 | rcu_barrier(); /* Wait for completion of call_rcu()'s */ | |
7af4cc3f HW |
1020 | } |
1021 | ||
1022 | MODULE_DESCRIPTION("netfilter packet queue handler"); | |
1023 | MODULE_AUTHOR("Harald Welte <laforge@netfilter.org>"); | |
1024 | MODULE_LICENSE("GPL"); | |
1025 | MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_QUEUE); | |
1026 | ||
65b4b4e8 AM |
1027 | module_init(nfnetlink_queue_init); |
1028 | module_exit(nfnetlink_queue_fini); |