]>
Commit | Line | Data |
---|---|---|
7af4cc3f HW |
1 | /* |
2 | * This is a module which is used for queueing packets and communicating with | |
3 | * userspace via nfetlink. | |
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> | |
21 | #include <linux/notifier.h> | |
22 | #include <linux/netdevice.h> | |
23 | #include <linux/netfilter.h> | |
838ab636 | 24 | #include <linux/proc_fs.h> |
7af4cc3f HW |
25 | #include <linux/netfilter_ipv4.h> |
26 | #include <linux/netfilter_ipv6.h> | |
27 | #include <linux/netfilter/nfnetlink.h> | |
28 | #include <linux/netfilter/nfnetlink_queue.h> | |
29 | #include <linux/list.h> | |
30 | #include <net/sock.h> | |
c01cd429 | 31 | #include <net/netfilter/nf_queue.h> |
7af4cc3f HW |
32 | |
33 | #include <asm/atomic.h> | |
34 | ||
fbcd923c HW |
35 | #ifdef CONFIG_BRIDGE_NETFILTER |
36 | #include "../bridge/br_private.h" | |
37 | #endif | |
38 | ||
7af4cc3f HW |
39 | #define NFQNL_QMAX_DEFAULT 1024 |
40 | ||
7af4cc3f HW |
41 | struct nfqnl_instance { |
42 | struct hlist_node hlist; /* global list of queues */ | |
9872bec7 | 43 | struct rcu_head rcu; |
7af4cc3f HW |
44 | |
45 | int peer_pid; | |
46 | unsigned int queue_maxlen; | |
47 | unsigned int copy_range; | |
48 | unsigned int queue_total; | |
49 | unsigned int queue_dropped; | |
50 | unsigned int queue_user_dropped; | |
51 | ||
e48b9b2f | 52 | unsigned int id_sequence; /* 'sequence' of pkt ids */ |
7af4cc3f HW |
53 | |
54 | u_int16_t queue_num; /* number of this queue */ | |
55 | u_int8_t copy_mode; | |
56 | ||
57 | spinlock_t lock; | |
58 | ||
59 | struct list_head queue_list; /* packets in queue */ | |
60 | }; | |
61 | ||
02f014d8 | 62 | typedef int (*nfqnl_cmpfn)(struct nf_queue_entry *, unsigned long); |
7af4cc3f | 63 | |
9872bec7 | 64 | static DEFINE_SPINLOCK(instances_lock); |
7af4cc3f | 65 | |
7af4cc3f | 66 | #define INSTANCE_BUCKETS 16 |
9d6023ab | 67 | static struct hlist_head instance_table[INSTANCE_BUCKETS] __read_mostly; |
7af4cc3f HW |
68 | |
69 | static inline u_int8_t instance_hashfn(u_int16_t queue_num) | |
70 | { | |
71 | return ((queue_num >> 8) | queue_num) % INSTANCE_BUCKETS; | |
72 | } | |
73 | ||
74 | static struct nfqnl_instance * | |
9872bec7 | 75 | instance_lookup(u_int16_t queue_num) |
7af4cc3f HW |
76 | { |
77 | struct hlist_head *head; | |
78 | struct hlist_node *pos; | |
79 | struct nfqnl_instance *inst; | |
80 | ||
81 | head = &instance_table[instance_hashfn(queue_num)]; | |
9872bec7 | 82 | hlist_for_each_entry_rcu(inst, pos, head, hlist) { |
7af4cc3f HW |
83 | if (inst->queue_num == queue_num) |
84 | return inst; | |
85 | } | |
86 | return NULL; | |
87 | } | |
88 | ||
7af4cc3f HW |
89 | static struct nfqnl_instance * |
90 | instance_create(u_int16_t queue_num, int pid) | |
91 | { | |
baab2ce7 | 92 | struct nfqnl_instance *inst; |
9872bec7 | 93 | unsigned int h; |
baab2ce7 | 94 | int err; |
7af4cc3f | 95 | |
9872bec7 | 96 | spin_lock(&instances_lock); |
baab2ce7 PM |
97 | if (instance_lookup(queue_num)) { |
98 | err = -EEXIST; | |
7af4cc3f | 99 | goto out_unlock; |
baab2ce7 | 100 | } |
7af4cc3f | 101 | |
10dfdc69 | 102 | inst = kzalloc(sizeof(*inst), GFP_ATOMIC); |
baab2ce7 PM |
103 | if (!inst) { |
104 | err = -ENOMEM; | |
7af4cc3f | 105 | goto out_unlock; |
baab2ce7 | 106 | } |
7af4cc3f | 107 | |
7af4cc3f HW |
108 | inst->queue_num = queue_num; |
109 | inst->peer_pid = pid; | |
110 | inst->queue_maxlen = NFQNL_QMAX_DEFAULT; | |
111 | inst->copy_range = 0xfffff; | |
112 | inst->copy_mode = NFQNL_COPY_NONE; | |
181a46a5 | 113 | spin_lock_init(&inst->lock); |
7af4cc3f | 114 | INIT_LIST_HEAD(&inst->queue_list); |
9872bec7 | 115 | INIT_RCU_HEAD(&inst->rcu); |
7af4cc3f | 116 | |
baab2ce7 PM |
117 | if (!try_module_get(THIS_MODULE)) { |
118 | err = -EAGAIN; | |
7af4cc3f | 119 | goto out_free; |
baab2ce7 | 120 | } |
7af4cc3f | 121 | |
9872bec7 PM |
122 | h = instance_hashfn(queue_num); |
123 | hlist_add_head_rcu(&inst->hlist, &instance_table[h]); | |
7af4cc3f | 124 | |
9872bec7 | 125 | spin_unlock(&instances_lock); |
7af4cc3f | 126 | |
7af4cc3f HW |
127 | return inst; |
128 | ||
129 | out_free: | |
130 | kfree(inst); | |
131 | out_unlock: | |
9872bec7 | 132 | spin_unlock(&instances_lock); |
baab2ce7 | 133 | return ERR_PTR(err); |
7af4cc3f HW |
134 | } |
135 | ||
b43d8d85 PM |
136 | static void nfqnl_flush(struct nfqnl_instance *queue, nfqnl_cmpfn cmpfn, |
137 | unsigned long data); | |
7af4cc3f HW |
138 | |
139 | static void | |
9872bec7 | 140 | instance_destroy_rcu(struct rcu_head *head) |
7af4cc3f | 141 | { |
9872bec7 PM |
142 | struct nfqnl_instance *inst = container_of(head, struct nfqnl_instance, |
143 | rcu); | |
7af4cc3f | 144 | |
b43d8d85 | 145 | nfqnl_flush(inst, NULL, 0); |
9872bec7 | 146 | kfree(inst); |
7af4cc3f HW |
147 | module_put(THIS_MODULE); |
148 | } | |
149 | ||
9872bec7 | 150 | static void |
7af4cc3f HW |
151 | __instance_destroy(struct nfqnl_instance *inst) |
152 | { | |
9872bec7 PM |
153 | hlist_del_rcu(&inst->hlist); |
154 | call_rcu(&inst->rcu, instance_destroy_rcu); | |
7af4cc3f HW |
155 | } |
156 | ||
9872bec7 | 157 | static void |
7af4cc3f HW |
158 | instance_destroy(struct nfqnl_instance *inst) |
159 | { | |
9872bec7 PM |
160 | spin_lock(&instances_lock); |
161 | __instance_destroy(inst); | |
162 | spin_unlock(&instances_lock); | |
7af4cc3f HW |
163 | } |
164 | ||
7af4cc3f | 165 | static inline void |
02f014d8 | 166 | __enqueue_entry(struct nfqnl_instance *queue, struct nf_queue_entry *entry) |
7af4cc3f | 167 | { |
0ac41e81 | 168 | list_add_tail(&entry->list, &queue->queue_list); |
7af4cc3f HW |
169 | queue->queue_total++; |
170 | } | |
171 | ||
02f014d8 | 172 | static struct nf_queue_entry * |
b43d8d85 | 173 | find_dequeue_entry(struct nfqnl_instance *queue, unsigned int id) |
7af4cc3f | 174 | { |
02f014d8 | 175 | struct nf_queue_entry *entry = NULL, *i; |
601e68e1 | 176 | |
7af4cc3f | 177 | spin_lock_bh(&queue->lock); |
b43d8d85 PM |
178 | |
179 | list_for_each_entry(i, &queue->queue_list, list) { | |
180 | if (i->id == id) { | |
181 | entry = i; | |
182 | break; | |
183 | } | |
184 | } | |
185 | ||
186 | if (entry) { | |
187 | list_del(&entry->list); | |
188 | queue->queue_total--; | |
189 | } | |
190 | ||
7af4cc3f HW |
191 | spin_unlock_bh(&queue->lock); |
192 | ||
193 | return entry; | |
194 | } | |
195 | ||
196 | static void | |
b43d8d85 | 197 | nfqnl_flush(struct nfqnl_instance *queue, nfqnl_cmpfn cmpfn, unsigned long data) |
7af4cc3f | 198 | { |
02f014d8 | 199 | struct nf_queue_entry *entry, *next; |
b43d8d85 | 200 | |
7af4cc3f | 201 | spin_lock_bh(&queue->lock); |
b43d8d85 PM |
202 | list_for_each_entry_safe(entry, next, &queue->queue_list, list) { |
203 | if (!cmpfn || cmpfn(entry, data)) { | |
204 | list_del(&entry->list); | |
205 | queue->queue_total--; | |
4b3d15ef | 206 | nf_reinject(entry, NF_DROP); |
b43d8d85 PM |
207 | } |
208 | } | |
7af4cc3f HW |
209 | spin_unlock_bh(&queue->lock); |
210 | } | |
211 | ||
212 | static struct sk_buff * | |
213 | nfqnl_build_packet_message(struct nfqnl_instance *queue, | |
0ef0f465 | 214 | struct nf_queue_entry *entry) |
7af4cc3f | 215 | { |
27a884dc | 216 | sk_buff_data_t old_tail; |
7af4cc3f HW |
217 | size_t size; |
218 | size_t data_len = 0; | |
219 | struct sk_buff *skb; | |
220 | struct nfqnl_msg_packet_hdr pmsg; | |
221 | struct nlmsghdr *nlh; | |
222 | struct nfgenmsg *nfmsg; | |
3e4ead4f JJ |
223 | struct sk_buff *entskb = entry->skb; |
224 | struct net_device *indev; | |
225 | struct net_device *outdev; | |
7af4cc3f | 226 | |
cabaa9bf | 227 | size = NLMSG_SPACE(sizeof(struct nfgenmsg)) |
df6fb868 PM |
228 | + nla_total_size(sizeof(struct nfqnl_msg_packet_hdr)) |
229 | + nla_total_size(sizeof(u_int32_t)) /* ifindex */ | |
230 | + nla_total_size(sizeof(u_int32_t)) /* ifindex */ | |
fbcd923c | 231 | #ifdef CONFIG_BRIDGE_NETFILTER |
df6fb868 PM |
232 | + nla_total_size(sizeof(u_int32_t)) /* ifindex */ |
233 | + nla_total_size(sizeof(u_int32_t)) /* ifindex */ | |
fbcd923c | 234 | #endif |
df6fb868 PM |
235 | + nla_total_size(sizeof(u_int32_t)) /* mark */ |
236 | + nla_total_size(sizeof(struct nfqnl_msg_packet_hw)) | |
237 | + nla_total_size(sizeof(struct nfqnl_msg_packet_timestamp)); | |
7af4cc3f | 238 | |
02f014d8 | 239 | outdev = entry->outdev; |
3e4ead4f | 240 | |
7af4cc3f | 241 | spin_lock_bh(&queue->lock); |
601e68e1 | 242 | |
861934c7 | 243 | switch ((enum nfqnl_config_mode)queue->copy_mode) { |
7af4cc3f HW |
244 | case NFQNL_COPY_META: |
245 | case NFQNL_COPY_NONE: | |
246 | data_len = 0; | |
247 | break; | |
601e68e1 | 248 | |
7af4cc3f | 249 | case NFQNL_COPY_PACKET: |
84fa7933 PM |
250 | if ((entskb->ip_summed == CHECKSUM_PARTIAL || |
251 | entskb->ip_summed == CHECKSUM_COMPLETE) && | |
0ef0f465 | 252 | skb_checksum_help(entskb)) { |
e7dfb09a PM |
253 | spin_unlock_bh(&queue->lock); |
254 | return NULL; | |
255 | } | |
601e68e1 | 256 | if (queue->copy_range == 0 |
3e4ead4f JJ |
257 | || queue->copy_range > entskb->len) |
258 | data_len = entskb->len; | |
7af4cc3f HW |
259 | else |
260 | data_len = queue->copy_range; | |
601e68e1 | 261 | |
df6fb868 | 262 | size += nla_total_size(data_len); |
7af4cc3f | 263 | break; |
7af4cc3f HW |
264 | } |
265 | ||
e48b9b2f PM |
266 | entry->id = queue->id_sequence++; |
267 | ||
7af4cc3f HW |
268 | spin_unlock_bh(&queue->lock); |
269 | ||
270 | skb = alloc_skb(size, GFP_ATOMIC); | |
271 | if (!skb) | |
272 | goto nlmsg_failure; | |
601e68e1 | 273 | |
27a884dc | 274 | old_tail = skb->tail; |
601e68e1 | 275 | nlh = NLMSG_PUT(skb, 0, 0, |
7af4cc3f HW |
276 | NFNL_SUBSYS_QUEUE << 8 | NFQNL_MSG_PACKET, |
277 | sizeof(struct nfgenmsg)); | |
278 | nfmsg = NLMSG_DATA(nlh); | |
02f014d8 | 279 | nfmsg->nfgen_family = entry->pf; |
7af4cc3f HW |
280 | nfmsg->version = NFNETLINK_V0; |
281 | nfmsg->res_id = htons(queue->queue_num); | |
282 | ||
283 | pmsg.packet_id = htonl(entry->id); | |
febf0a43 | 284 | pmsg.hw_protocol = entskb->protocol; |
02f014d8 | 285 | pmsg.hook = entry->hook; |
7af4cc3f | 286 | |
df6fb868 | 287 | NLA_PUT(skb, NFQA_PACKET_HDR, sizeof(pmsg), &pmsg); |
7af4cc3f | 288 | |
02f014d8 | 289 | indev = entry->indev; |
3e4ead4f | 290 | if (indev) { |
fbcd923c | 291 | #ifndef CONFIG_BRIDGE_NETFILTER |
ea3a66ff | 292 | NLA_PUT_BE32(skb, NFQA_IFINDEX_INDEV, htonl(indev->ifindex)); |
fbcd923c | 293 | #else |
02f014d8 | 294 | if (entry->pf == PF_BRIDGE) { |
fbcd923c | 295 | /* Case 1: indev is physical input device, we need to |
601e68e1 | 296 | * look for bridge group (when called from |
fbcd923c | 297 | * netfilter_bridge) */ |
ea3a66ff PM |
298 | NLA_PUT_BE32(skb, NFQA_IFINDEX_PHYSINDEV, |
299 | htonl(indev->ifindex)); | |
fbcd923c | 300 | /* this is the bridge group "brX" */ |
ea3a66ff PM |
301 | NLA_PUT_BE32(skb, NFQA_IFINDEX_INDEV, |
302 | htonl(indev->br_port->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" */ |
ea3a66ff PM |
326 | NLA_PUT_BE32(skb, NFQA_IFINDEX_OUTDEV, |
327 | htonl(outdev->br_port->br->dev->ifindex)); | |
fbcd923c HW |
328 | } else { |
329 | /* Case 2: outdev is bridge group, we need to look for | |
330 | * physical output device (when called from ipv4) */ | |
ea3a66ff PM |
331 | NLA_PUT_BE32(skb, NFQA_IFINDEX_OUTDEV, |
332 | htonl(outdev->ifindex)); | |
333 | if (entskb->nf_bridge && entskb->nf_bridge->physoutdev) | |
334 | NLA_PUT_BE32(skb, NFQA_IFINDEX_PHYSOUTDEV, | |
335 | htonl(entskb->nf_bridge->physoutdev->ifindex)); | |
fbcd923c HW |
336 | } |
337 | #endif | |
7af4cc3f HW |
338 | } |
339 | ||
ea3a66ff PM |
340 | if (entskb->mark) |
341 | NLA_PUT_BE32(skb, NFQA_MARK, htonl(entskb->mark)); | |
7af4cc3f | 342 | |
b95cce35 | 343 | if (indev && entskb->dev) { |
7af4cc3f | 344 | struct nfqnl_msg_packet_hw phw; |
b95cce35 SH |
345 | int len = dev_parse_header(entskb, phw.hw_addr); |
346 | if (len) { | |
347 | phw.hw_addrlen = htons(len); | |
df6fb868 | 348 | NLA_PUT(skb, NFQA_HWADDR, sizeof(phw), &phw); |
b95cce35 | 349 | } |
7af4cc3f HW |
350 | } |
351 | ||
b7aa0bf7 | 352 | if (entskb->tstamp.tv64) { |
7af4cc3f | 353 | struct nfqnl_msg_packet_timestamp ts; |
b7aa0bf7 ED |
354 | struct timeval tv = ktime_to_timeval(entskb->tstamp); |
355 | ts.sec = cpu_to_be64(tv.tv_sec); | |
356 | ts.usec = cpu_to_be64(tv.tv_usec); | |
7af4cc3f | 357 | |
df6fb868 | 358 | NLA_PUT(skb, NFQA_TIMESTAMP, sizeof(ts), &ts); |
7af4cc3f HW |
359 | } |
360 | ||
361 | if (data_len) { | |
df6fb868 | 362 | struct nlattr *nla; |
ca7c48ca | 363 | int sz = nla_attr_size(data_len); |
7af4cc3f | 364 | |
df6fb868 | 365 | if (skb_tailroom(skb) < nla_total_size(data_len)) { |
7af4cc3f HW |
366 | printk(KERN_WARNING "nf_queue: no tailroom!\n"); |
367 | goto nlmsg_failure; | |
368 | } | |
369 | ||
df6fb868 PM |
370 | nla = (struct nlattr *)skb_put(skb, nla_total_size(data_len)); |
371 | nla->nla_type = NFQA_PAYLOAD; | |
ca7c48ca | 372 | nla->nla_len = sz; |
7af4cc3f | 373 | |
df6fb868 | 374 | if (skb_copy_bits(entskb, 0, nla_data(nla), data_len)) |
7af4cc3f HW |
375 | BUG(); |
376 | } | |
601e68e1 | 377 | |
7af4cc3f HW |
378 | nlh->nlmsg_len = skb->tail - old_tail; |
379 | return skb; | |
380 | ||
381 | nlmsg_failure: | |
df6fb868 | 382 | nla_put_failure: |
7af4cc3f HW |
383 | if (skb) |
384 | kfree_skb(skb); | |
7af4cc3f HW |
385 | if (net_ratelimit()) |
386 | printk(KERN_ERR "nf_queue: error creating packet message\n"); | |
387 | return NULL; | |
388 | } | |
389 | ||
390 | static int | |
02f014d8 | 391 | nfqnl_enqueue_packet(struct nf_queue_entry *entry, unsigned int queuenum) |
7af4cc3f | 392 | { |
7af4cc3f HW |
393 | struct sk_buff *nskb; |
394 | struct nfqnl_instance *queue; | |
0ef0f465 | 395 | int err; |
7af4cc3f | 396 | |
9872bec7 PM |
397 | /* rcu_read_lock()ed by nf_hook_slow() */ |
398 | queue = instance_lookup(queuenum); | |
2bd01197 | 399 | if (!queue) |
0ef0f465 | 400 | goto err_out; |
7af4cc3f | 401 | |
2bd01197 | 402 | if (queue->copy_mode == NFQNL_COPY_NONE) |
0ef0f465 | 403 | goto err_out; |
7af4cc3f | 404 | |
0ef0f465 | 405 | nskb = nfqnl_build_packet_message(queue, entry); |
7af4cc3f | 406 | if (nskb == NULL) |
0ef0f465 | 407 | goto err_out; |
601e68e1 | 408 | |
7af4cc3f | 409 | spin_lock_bh(&queue->lock); |
601e68e1 | 410 | |
7af4cc3f | 411 | if (!queue->peer_pid) |
601e68e1 | 412 | goto err_out_free_nskb; |
7af4cc3f HW |
413 | |
414 | if (queue->queue_total >= queue->queue_maxlen) { | |
601e68e1 | 415 | queue->queue_dropped++; |
7af4cc3f | 416 | if (net_ratelimit()) |
601e68e1 YH |
417 | printk(KERN_WARNING "nf_queue: full at %d entries, " |
418 | "dropping packets(s). Dropped: %d\n", | |
7af4cc3f HW |
419 | queue->queue_total, queue->queue_dropped); |
420 | goto err_out_free_nskb; | |
421 | } | |
422 | ||
423 | /* nfnetlink_unicast will either free the nskb or add it to a socket */ | |
0ef0f465 PM |
424 | err = nfnetlink_unicast(nskb, queue->peer_pid, MSG_DONTWAIT); |
425 | if (err < 0) { | |
601e68e1 | 426 | queue->queue_user_dropped++; |
7af4cc3f HW |
427 | goto err_out_unlock; |
428 | } | |
429 | ||
430 | __enqueue_entry(queue, entry); | |
431 | ||
432 | spin_unlock_bh(&queue->lock); | |
0ef0f465 | 433 | return 0; |
7af4cc3f HW |
434 | |
435 | err_out_free_nskb: | |
601e68e1 | 436 | kfree_skb(nskb); |
7af4cc3f HW |
437 | err_out_unlock: |
438 | spin_unlock_bh(&queue->lock); | |
0ef0f465 PM |
439 | err_out: |
440 | return -1; | |
7af4cc3f HW |
441 | } |
442 | ||
443 | static int | |
02f014d8 | 444 | nfqnl_mangle(void *data, int data_len, struct nf_queue_entry *e) |
7af4cc3f | 445 | { |
e2b58a67 | 446 | struct sk_buff *nskb; |
7af4cc3f HW |
447 | int diff; |
448 | ||
449 | diff = data_len - e->skb->len; | |
d8a585d7 PM |
450 | if (diff < 0) { |
451 | if (pskb_trim(e->skb, data_len)) | |
452 | return -ENOMEM; | |
453 | } else if (diff > 0) { | |
7af4cc3f HW |
454 | if (data_len > 0xFFFF) |
455 | return -EINVAL; | |
456 | if (diff > skb_tailroom(e->skb)) { | |
e2b58a67 | 457 | nskb = skb_copy_expand(e->skb, 0, |
2ca7b0ac HX |
458 | diff - skb_tailroom(e->skb), |
459 | GFP_ATOMIC); | |
e2b58a67 | 460 | if (!nskb) { |
1158ba27 | 461 | printk(KERN_WARNING "nf_queue: OOM " |
7af4cc3f | 462 | "in mangle, dropping packet\n"); |
e2b58a67 | 463 | return -ENOMEM; |
7af4cc3f | 464 | } |
e2b58a67 PM |
465 | kfree_skb(e->skb); |
466 | e->skb = nskb; | |
7af4cc3f HW |
467 | } |
468 | skb_put(e->skb, diff); | |
469 | } | |
37d41879 | 470 | if (!skb_make_writable(e->skb, data_len)) |
7af4cc3f | 471 | return -ENOMEM; |
27d7ff46 | 472 | skb_copy_to_linear_data(e->skb, data, data_len); |
e7dfb09a | 473 | e->skb->ip_summed = CHECKSUM_NONE; |
7af4cc3f HW |
474 | return 0; |
475 | } | |
476 | ||
7af4cc3f HW |
477 | static int |
478 | nfqnl_set_mode(struct nfqnl_instance *queue, | |
479 | unsigned char mode, unsigned int range) | |
480 | { | |
c5de0dfd | 481 | int status = 0; |
7af4cc3f HW |
482 | |
483 | spin_lock_bh(&queue->lock); | |
c5de0dfd PM |
484 | switch (mode) { |
485 | case NFQNL_COPY_NONE: | |
486 | case NFQNL_COPY_META: | |
487 | queue->copy_mode = mode; | |
488 | queue->copy_range = 0; | |
489 | break; | |
490 | ||
491 | case NFQNL_COPY_PACKET: | |
492 | queue->copy_mode = mode; | |
493 | /* we're using struct nlattr which has 16bit nla_len */ | |
494 | if (range > 0xffff) | |
495 | queue->copy_range = 0xffff; | |
496 | else | |
497 | queue->copy_range = range; | |
498 | break; | |
499 | ||
500 | default: | |
501 | status = -EINVAL; | |
502 | ||
503 | } | |
7af4cc3f HW |
504 | spin_unlock_bh(&queue->lock); |
505 | ||
506 | return status; | |
507 | } | |
508 | ||
509 | static int | |
02f014d8 | 510 | dev_cmp(struct nf_queue_entry *entry, unsigned long ifindex) |
7af4cc3f | 511 | { |
02f014d8 PM |
512 | if (entry->indev) |
513 | if (entry->indev->ifindex == ifindex) | |
7af4cc3f | 514 | return 1; |
02f014d8 PM |
515 | if (entry->outdev) |
516 | if (entry->outdev->ifindex == ifindex) | |
7af4cc3f | 517 | return 1; |
ef47c6a7 PM |
518 | #ifdef CONFIG_BRIDGE_NETFILTER |
519 | if (entry->skb->nf_bridge) { | |
520 | if (entry->skb->nf_bridge->physindev && | |
521 | entry->skb->nf_bridge->physindev->ifindex == ifindex) | |
522 | return 1; | |
523 | if (entry->skb->nf_bridge->physoutdev && | |
524 | entry->skb->nf_bridge->physoutdev->ifindex == ifindex) | |
525 | return 1; | |
526 | } | |
527 | #endif | |
7af4cc3f HW |
528 | return 0; |
529 | } | |
530 | ||
531 | /* drop all packets with either indev or outdev == ifindex from all queue | |
532 | * instances */ | |
533 | static void | |
534 | nfqnl_dev_drop(int ifindex) | |
535 | { | |
536 | int i; | |
601e68e1 | 537 | |
9872bec7 | 538 | rcu_read_lock(); |
7af4cc3f | 539 | |
9872bec7 | 540 | for (i = 0; i < INSTANCE_BUCKETS; i++) { |
7af4cc3f HW |
541 | struct hlist_node *tmp; |
542 | struct nfqnl_instance *inst; | |
543 | struct hlist_head *head = &instance_table[i]; | |
544 | ||
9872bec7 | 545 | hlist_for_each_entry_rcu(inst, tmp, head, hlist) |
b43d8d85 | 546 | nfqnl_flush(inst, dev_cmp, ifindex); |
7af4cc3f HW |
547 | } |
548 | ||
9872bec7 | 549 | rcu_read_unlock(); |
7af4cc3f HW |
550 | } |
551 | ||
552 | #define RCV_SKB_FAIL(err) do { netlink_ack(skb, nlh, (err)); return; } while (0) | |
553 | ||
554 | static int | |
555 | nfqnl_rcv_dev_event(struct notifier_block *this, | |
556 | unsigned long event, void *ptr) | |
557 | { | |
558 | struct net_device *dev = ptr; | |
559 | ||
c346dca1 | 560 | if (dev_net(dev) != &init_net) |
e9dc8653 EB |
561 | return NOTIFY_DONE; |
562 | ||
7af4cc3f HW |
563 | /* Drop any packets associated with the downed device */ |
564 | if (event == NETDEV_DOWN) | |
565 | nfqnl_dev_drop(dev->ifindex); | |
566 | return NOTIFY_DONE; | |
567 | } | |
568 | ||
569 | static struct notifier_block nfqnl_dev_notifier = { | |
570 | .notifier_call = nfqnl_rcv_dev_event, | |
571 | }; | |
572 | ||
573 | static int | |
574 | nfqnl_rcv_nl_event(struct notifier_block *this, | |
575 | unsigned long event, void *ptr) | |
576 | { | |
577 | struct netlink_notify *n = ptr; | |
578 | ||
579 | if (event == NETLINK_URELEASE && | |
580 | n->protocol == NETLINK_NETFILTER && n->pid) { | |
581 | int i; | |
582 | ||
583 | /* destroy all instances for this pid */ | |
9872bec7 PM |
584 | spin_lock(&instances_lock); |
585 | for (i = 0; i < INSTANCE_BUCKETS; i++) { | |
7af4cc3f HW |
586 | struct hlist_node *tmp, *t2; |
587 | struct nfqnl_instance *inst; | |
588 | struct hlist_head *head = &instance_table[i]; | |
589 | ||
590 | hlist_for_each_entry_safe(inst, tmp, t2, head, hlist) { | |
b4b51029 EB |
591 | if ((n->net == &init_net) && |
592 | (n->pid == inst->peer_pid)) | |
7af4cc3f HW |
593 | __instance_destroy(inst); |
594 | } | |
595 | } | |
9872bec7 | 596 | spin_unlock(&instances_lock); |
7af4cc3f HW |
597 | } |
598 | return NOTIFY_DONE; | |
599 | } | |
600 | ||
601 | static struct notifier_block nfqnl_rtnl_notifier = { | |
602 | .notifier_call = nfqnl_rcv_nl_event, | |
603 | }; | |
604 | ||
5bf75853 PM |
605 | static const struct nla_policy nfqa_verdict_policy[NFQA_MAX+1] = { |
606 | [NFQA_VERDICT_HDR] = { .len = sizeof(struct nfqnl_msg_verdict_hdr) }, | |
607 | [NFQA_MARK] = { .type = NLA_U32 }, | |
608 | [NFQA_PAYLOAD] = { .type = NLA_UNSPEC }, | |
838ab636 HW |
609 | }; |
610 | ||
7af4cc3f HW |
611 | static int |
612 | nfqnl_recv_verdict(struct sock *ctnl, struct sk_buff *skb, | |
df6fb868 | 613 | struct nlmsghdr *nlh, struct nlattr *nfqa[]) |
7af4cc3f HW |
614 | { |
615 | struct nfgenmsg *nfmsg = NLMSG_DATA(nlh); | |
616 | u_int16_t queue_num = ntohs(nfmsg->res_id); | |
617 | ||
618 | struct nfqnl_msg_verdict_hdr *vhdr; | |
619 | struct nfqnl_instance *queue; | |
620 | unsigned int verdict; | |
02f014d8 | 621 | struct nf_queue_entry *entry; |
838ab636 | 622 | int err; |
7af4cc3f | 623 | |
9872bec7 PM |
624 | rcu_read_lock(); |
625 | queue = instance_lookup(queue_num); | |
626 | if (!queue) { | |
627 | err = -ENODEV; | |
628 | goto err_out_unlock; | |
629 | } | |
7af4cc3f | 630 | |
838ab636 HW |
631 | if (queue->peer_pid != NETLINK_CB(skb).pid) { |
632 | err = -EPERM; | |
9872bec7 | 633 | goto err_out_unlock; |
838ab636 | 634 | } |
7af4cc3f | 635 | |
df6fb868 | 636 | if (!nfqa[NFQA_VERDICT_HDR]) { |
838ab636 | 637 | err = -EINVAL; |
9872bec7 | 638 | goto err_out_unlock; |
838ab636 | 639 | } |
7af4cc3f | 640 | |
df6fb868 | 641 | vhdr = nla_data(nfqa[NFQA_VERDICT_HDR]); |
7af4cc3f HW |
642 | verdict = ntohl(vhdr->verdict); |
643 | ||
838ab636 HW |
644 | if ((verdict & NF_VERDICT_MASK) > NF_MAX_VERDICT) { |
645 | err = -EINVAL; | |
9872bec7 | 646 | goto err_out_unlock; |
838ab636 | 647 | } |
7af4cc3f | 648 | |
b43d8d85 | 649 | entry = find_dequeue_entry(queue, ntohl(vhdr->id)); |
838ab636 HW |
650 | if (entry == NULL) { |
651 | err = -ENOENT; | |
9872bec7 | 652 | goto err_out_unlock; |
838ab636 | 653 | } |
9872bec7 | 654 | rcu_read_unlock(); |
7af4cc3f | 655 | |
df6fb868 PM |
656 | if (nfqa[NFQA_PAYLOAD]) { |
657 | if (nfqnl_mangle(nla_data(nfqa[NFQA_PAYLOAD]), | |
658 | nla_len(nfqa[NFQA_PAYLOAD]), entry) < 0) | |
7af4cc3f HW |
659 | verdict = NF_DROP; |
660 | } | |
661 | ||
df6fb868 | 662 | if (nfqa[NFQA_MARK]) |
ea3a66ff | 663 | entry->skb->mark = ntohl(nla_get_be32(nfqa[NFQA_MARK])); |
601e68e1 | 664 | |
4b3d15ef | 665 | nf_reinject(entry, verdict); |
7af4cc3f | 666 | return 0; |
838ab636 | 667 | |
9872bec7 PM |
668 | err_out_unlock: |
669 | rcu_read_unlock(); | |
838ab636 | 670 | return err; |
7af4cc3f HW |
671 | } |
672 | ||
673 | static int | |
674 | nfqnl_recv_unsupp(struct sock *ctnl, struct sk_buff *skb, | |
df6fb868 | 675 | struct nlmsghdr *nlh, struct nlattr *nfqa[]) |
7af4cc3f HW |
676 | { |
677 | return -ENOTSUPP; | |
678 | } | |
679 | ||
5bf75853 PM |
680 | static const struct nla_policy nfqa_cfg_policy[NFQA_CFG_MAX+1] = { |
681 | [NFQA_CFG_CMD] = { .len = sizeof(struct nfqnl_msg_config_cmd) }, | |
682 | [NFQA_CFG_PARAMS] = { .len = sizeof(struct nfqnl_msg_config_params) }, | |
838ab636 HW |
683 | }; |
684 | ||
e3ac5298 | 685 | static const struct nf_queue_handler nfqh = { |
bbd86b9f HW |
686 | .name = "nf_queue", |
687 | .outfn = &nfqnl_enqueue_packet, | |
688 | }; | |
689 | ||
7af4cc3f HW |
690 | static int |
691 | nfqnl_recv_config(struct sock *ctnl, struct sk_buff *skb, | |
df6fb868 | 692 | struct nlmsghdr *nlh, struct nlattr *nfqa[]) |
7af4cc3f HW |
693 | { |
694 | struct nfgenmsg *nfmsg = NLMSG_DATA(nlh); | |
695 | u_int16_t queue_num = ntohs(nfmsg->res_id); | |
696 | struct nfqnl_instance *queue; | |
9872bec7 | 697 | struct nfqnl_msg_config_cmd *cmd = NULL; |
838ab636 | 698 | int ret = 0; |
7af4cc3f | 699 | |
9872bec7 PM |
700 | if (nfqa[NFQA_CFG_CMD]) { |
701 | cmd = nla_data(nfqa[NFQA_CFG_CMD]); | |
702 | ||
703 | /* Commands without queue context - might sleep */ | |
704 | switch (cmd->command) { | |
705 | case NFQNL_CFG_CMD_PF_BIND: | |
914afea8 PM |
706 | return nf_register_queue_handler(ntohs(cmd->pf), |
707 | &nfqh); | |
9872bec7 | 708 | case NFQNL_CFG_CMD_PF_UNBIND: |
914afea8 PM |
709 | return nf_unregister_queue_handler(ntohs(cmd->pf), |
710 | &nfqh); | |
9872bec7 | 711 | } |
9872bec7 PM |
712 | } |
713 | ||
714 | rcu_read_lock(); | |
715 | queue = instance_lookup(queue_num); | |
a3c8e7fd PM |
716 | if (queue && queue->peer_pid != NETLINK_CB(skb).pid) { |
717 | ret = -EPERM; | |
9872bec7 | 718 | goto err_out_unlock; |
a3c8e7fd PM |
719 | } |
720 | ||
9872bec7 | 721 | if (cmd != NULL) { |
7af4cc3f HW |
722 | switch (cmd->command) { |
723 | case NFQNL_CFG_CMD_BIND: | |
9872bec7 PM |
724 | if (queue) { |
725 | ret = -EBUSY; | |
726 | goto err_out_unlock; | |
727 | } | |
7af4cc3f | 728 | queue = instance_create(queue_num, NETLINK_CB(skb).pid); |
baab2ce7 PM |
729 | if (IS_ERR(queue)) { |
730 | ret = PTR_ERR(queue); | |
9872bec7 PM |
731 | goto err_out_unlock; |
732 | } | |
7af4cc3f HW |
733 | break; |
734 | case NFQNL_CFG_CMD_UNBIND: | |
9872bec7 PM |
735 | if (!queue) { |
736 | ret = -ENODEV; | |
737 | goto err_out_unlock; | |
738 | } | |
7af4cc3f HW |
739 | instance_destroy(queue); |
740 | break; | |
741 | case NFQNL_CFG_CMD_PF_BIND: | |
7af4cc3f | 742 | case NFQNL_CFG_CMD_PF_UNBIND: |
7af4cc3f HW |
743 | break; |
744 | default: | |
cd21f0ac | 745 | ret = -ENOTSUPP; |
838ab636 | 746 | break; |
7af4cc3f | 747 | } |
7af4cc3f HW |
748 | } |
749 | ||
df6fb868 | 750 | if (nfqa[NFQA_CFG_PARAMS]) { |
7af4cc3f | 751 | struct nfqnl_msg_config_params *params; |
7af4cc3f | 752 | |
406dbfc9 | 753 | if (!queue) { |
a3c8e7fd | 754 | ret = -ENODEV; |
9872bec7 | 755 | goto err_out_unlock; |
406dbfc9 | 756 | } |
df6fb868 | 757 | params = nla_data(nfqa[NFQA_CFG_PARAMS]); |
7af4cc3f HW |
758 | nfqnl_set_mode(queue, params->copy_mode, |
759 | ntohl(params->copy_range)); | |
760 | } | |
761 | ||
df6fb868 | 762 | if (nfqa[NFQA_CFG_QUEUE_MAXLEN]) { |
829e17a1 | 763 | __be32 *queue_maxlen; |
a3c8e7fd PM |
764 | |
765 | if (!queue) { | |
766 | ret = -ENODEV; | |
9872bec7 | 767 | goto err_out_unlock; |
a3c8e7fd | 768 | } |
df6fb868 | 769 | queue_maxlen = nla_data(nfqa[NFQA_CFG_QUEUE_MAXLEN]); |
829e17a1 EL |
770 | spin_lock_bh(&queue->lock); |
771 | queue->queue_maxlen = ntohl(*queue_maxlen); | |
772 | spin_unlock_bh(&queue->lock); | |
773 | } | |
774 | ||
9872bec7 PM |
775 | err_out_unlock: |
776 | rcu_read_unlock(); | |
838ab636 | 777 | return ret; |
7af4cc3f HW |
778 | } |
779 | ||
7c8d4cb4 | 780 | static const struct nfnl_callback nfqnl_cb[NFQNL_MSG_MAX] = { |
7af4cc3f | 781 | [NFQNL_MSG_PACKET] = { .call = nfqnl_recv_unsupp, |
37d2e7a2 | 782 | .attr_count = NFQA_MAX, }, |
7af4cc3f | 783 | [NFQNL_MSG_VERDICT] = { .call = nfqnl_recv_verdict, |
5bf75853 PM |
784 | .attr_count = NFQA_MAX, |
785 | .policy = nfqa_verdict_policy }, | |
7af4cc3f | 786 | [NFQNL_MSG_CONFIG] = { .call = nfqnl_recv_config, |
5bf75853 PM |
787 | .attr_count = NFQA_CFG_MAX, |
788 | .policy = nfqa_cfg_policy }, | |
7af4cc3f HW |
789 | }; |
790 | ||
7c8d4cb4 | 791 | static const struct nfnetlink_subsystem nfqnl_subsys = { |
7af4cc3f HW |
792 | .name = "nf_queue", |
793 | .subsys_id = NFNL_SUBSYS_QUEUE, | |
794 | .cb_count = NFQNL_MSG_MAX, | |
7af4cc3f HW |
795 | .cb = nfqnl_cb, |
796 | }; | |
797 | ||
838ab636 HW |
798 | #ifdef CONFIG_PROC_FS |
799 | struct iter_state { | |
800 | unsigned int bucket; | |
801 | }; | |
802 | ||
803 | static struct hlist_node *get_first(struct seq_file *seq) | |
804 | { | |
805 | struct iter_state *st = seq->private; | |
806 | ||
807 | if (!st) | |
808 | return NULL; | |
809 | ||
810 | for (st->bucket = 0; st->bucket < INSTANCE_BUCKETS; st->bucket++) { | |
811 | if (!hlist_empty(&instance_table[st->bucket])) | |
812 | return instance_table[st->bucket].first; | |
813 | } | |
814 | return NULL; | |
815 | } | |
816 | ||
817 | static struct hlist_node *get_next(struct seq_file *seq, struct hlist_node *h) | |
818 | { | |
819 | struct iter_state *st = seq->private; | |
820 | ||
821 | h = h->next; | |
822 | while (!h) { | |
823 | if (++st->bucket >= INSTANCE_BUCKETS) | |
824 | return NULL; | |
825 | ||
826 | h = instance_table[st->bucket].first; | |
827 | } | |
828 | return h; | |
829 | } | |
830 | ||
831 | static struct hlist_node *get_idx(struct seq_file *seq, loff_t pos) | |
832 | { | |
833 | struct hlist_node *head; | |
834 | head = get_first(seq); | |
835 | ||
836 | if (head) | |
837 | while (pos && (head = get_next(seq, head))) | |
838 | pos--; | |
839 | return pos ? NULL : head; | |
840 | } | |
841 | ||
842 | static void *seq_start(struct seq_file *seq, loff_t *pos) | |
ca7c48ca | 843 | __acquires(instances_lock) |
838ab636 | 844 | { |
9872bec7 | 845 | spin_lock(&instances_lock); |
838ab636 HW |
846 | return get_idx(seq, *pos); |
847 | } | |
848 | ||
849 | static void *seq_next(struct seq_file *s, void *v, loff_t *pos) | |
850 | { | |
851 | (*pos)++; | |
852 | return get_next(s, v); | |
853 | } | |
854 | ||
855 | static void seq_stop(struct seq_file *s, void *v) | |
ca7c48ca | 856 | __releases(instances_lock) |
838ab636 | 857 | { |
9872bec7 | 858 | spin_unlock(&instances_lock); |
838ab636 HW |
859 | } |
860 | ||
861 | static int seq_show(struct seq_file *s, void *v) | |
862 | { | |
863 | const struct nfqnl_instance *inst = v; | |
864 | ||
865 | return seq_printf(s, "%5d %6d %5d %1d %5d %5d %5d %8d %2d\n", | |
866 | inst->queue_num, | |
867 | inst->peer_pid, inst->queue_total, | |
868 | inst->copy_mode, inst->copy_range, | |
869 | inst->queue_dropped, inst->queue_user_dropped, | |
9872bec7 | 870 | inst->id_sequence, 1); |
838ab636 HW |
871 | } |
872 | ||
56b3d975 | 873 | static const struct seq_operations nfqnl_seq_ops = { |
838ab636 HW |
874 | .start = seq_start, |
875 | .next = seq_next, | |
876 | .stop = seq_stop, | |
877 | .show = seq_show, | |
878 | }; | |
879 | ||
880 | static int nfqnl_open(struct inode *inode, struct file *file) | |
881 | { | |
e2da5913 PE |
882 | return seq_open_private(file, &nfqnl_seq_ops, |
883 | sizeof(struct iter_state)); | |
838ab636 HW |
884 | } |
885 | ||
da7071d7 | 886 | static const struct file_operations nfqnl_file_ops = { |
838ab636 HW |
887 | .owner = THIS_MODULE, |
888 | .open = nfqnl_open, | |
889 | .read = seq_read, | |
890 | .llseek = seq_lseek, | |
891 | .release = seq_release_private, | |
892 | }; | |
893 | ||
894 | #endif /* PROC_FS */ | |
895 | ||
32292a7f | 896 | static int __init nfnetlink_queue_init(void) |
7af4cc3f | 897 | { |
838ab636 | 898 | int i, status = -ENOMEM; |
601e68e1 | 899 | |
838ab636 HW |
900 | for (i = 0; i < INSTANCE_BUCKETS; i++) |
901 | INIT_HLIST_HEAD(&instance_table[i]); | |
902 | ||
7af4cc3f HW |
903 | netlink_register_notifier(&nfqnl_rtnl_notifier); |
904 | status = nfnetlink_subsys_register(&nfqnl_subsys); | |
905 | if (status < 0) { | |
906 | printk(KERN_ERR "nf_queue: failed to create netlink socket\n"); | |
907 | goto cleanup_netlink_notifier; | |
908 | } | |
909 | ||
838ab636 | 910 | #ifdef CONFIG_PROC_FS |
8eeee8b1 DL |
911 | if (!proc_create("nfnetlink_queue", 0440, |
912 | proc_net_netfilter, &nfqnl_file_ops)) | |
838ab636 | 913 | goto cleanup_subsys; |
838ab636 HW |
914 | #endif |
915 | ||
7af4cc3f HW |
916 | register_netdevice_notifier(&nfqnl_dev_notifier); |
917 | return status; | |
918 | ||
838ab636 HW |
919 | #ifdef CONFIG_PROC_FS |
920 | cleanup_subsys: | |
7af4cc3f | 921 | nfnetlink_subsys_unregister(&nfqnl_subsys); |
32292a7f | 922 | #endif |
7af4cc3f HW |
923 | cleanup_netlink_notifier: |
924 | netlink_unregister_notifier(&nfqnl_rtnl_notifier); | |
925 | return status; | |
926 | } | |
927 | ||
65b4b4e8 | 928 | static void __exit nfnetlink_queue_fini(void) |
7af4cc3f | 929 | { |
32292a7f PM |
930 | nf_unregister_queue_handlers(&nfqh); |
931 | unregister_netdevice_notifier(&nfqnl_dev_notifier); | |
932 | #ifdef CONFIG_PROC_FS | |
933 | remove_proc_entry("nfnetlink_queue", proc_net_netfilter); | |
934 | #endif | |
935 | nfnetlink_subsys_unregister(&nfqnl_subsys); | |
936 | netlink_unregister_notifier(&nfqnl_rtnl_notifier); | |
7af4cc3f HW |
937 | } |
938 | ||
939 | MODULE_DESCRIPTION("netfilter packet queue handler"); | |
940 | MODULE_AUTHOR("Harald Welte <laforge@netfilter.org>"); | |
941 | MODULE_LICENSE("GPL"); | |
942 | MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_QUEUE); | |
943 | ||
65b4b4e8 AM |
944 | module_init(nfnetlink_queue_init); |
945 | module_exit(nfnetlink_queue_fini); |