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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 HW |
33 | |
34 | #include <asm/atomic.h> | |
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; | |
61 | atomic_t 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 | ||
02f014d8 | 174 | static struct nf_queue_entry * |
b43d8d85 | 175 | find_dequeue_entry(struct nfqnl_instance *queue, unsigned int id) |
7af4cc3f | 176 | { |
02f014d8 | 177 | struct nf_queue_entry *entry = NULL, *i; |
601e68e1 | 178 | |
7af4cc3f | 179 | spin_lock_bh(&queue->lock); |
b43d8d85 PM |
180 | |
181 | list_for_each_entry(i, &queue->queue_list, list) { | |
182 | if (i->id == id) { | |
183 | entry = i; | |
184 | break; | |
185 | } | |
186 | } | |
187 | ||
188 | if (entry) { | |
189 | list_del(&entry->list); | |
190 | queue->queue_total--; | |
191 | } | |
192 | ||
7af4cc3f HW |
193 | spin_unlock_bh(&queue->lock); |
194 | ||
195 | return entry; | |
196 | } | |
197 | ||
198 | static void | |
b43d8d85 | 199 | nfqnl_flush(struct nfqnl_instance *queue, nfqnl_cmpfn cmpfn, unsigned long data) |
7af4cc3f | 200 | { |
02f014d8 | 201 | struct nf_queue_entry *entry, *next; |
b43d8d85 | 202 | |
7af4cc3f | 203 | spin_lock_bh(&queue->lock); |
b43d8d85 PM |
204 | list_for_each_entry_safe(entry, next, &queue->queue_list, list) { |
205 | if (!cmpfn || cmpfn(entry, data)) { | |
206 | list_del(&entry->list); | |
207 | queue->queue_total--; | |
4b3d15ef | 208 | nf_reinject(entry, NF_DROP); |
b43d8d85 PM |
209 | } |
210 | } | |
7af4cc3f HW |
211 | spin_unlock_bh(&queue->lock); |
212 | } | |
213 | ||
214 | static struct sk_buff * | |
215 | nfqnl_build_packet_message(struct nfqnl_instance *queue, | |
0ef0f465 | 216 | struct nf_queue_entry *entry) |
7af4cc3f | 217 | { |
27a884dc | 218 | sk_buff_data_t old_tail; |
7af4cc3f HW |
219 | size_t size; |
220 | size_t data_len = 0; | |
221 | struct sk_buff *skb; | |
222 | struct nfqnl_msg_packet_hdr pmsg; | |
223 | struct nlmsghdr *nlh; | |
224 | struct nfgenmsg *nfmsg; | |
3e4ead4f JJ |
225 | struct sk_buff *entskb = entry->skb; |
226 | struct net_device *indev; | |
227 | struct net_device *outdev; | |
7af4cc3f | 228 | |
cabaa9bf | 229 | size = NLMSG_SPACE(sizeof(struct nfgenmsg)) |
df6fb868 PM |
230 | + nla_total_size(sizeof(struct nfqnl_msg_packet_hdr)) |
231 | + nla_total_size(sizeof(u_int32_t)) /* ifindex */ | |
232 | + nla_total_size(sizeof(u_int32_t)) /* ifindex */ | |
fbcd923c | 233 | #ifdef CONFIG_BRIDGE_NETFILTER |
df6fb868 PM |
234 | + nla_total_size(sizeof(u_int32_t)) /* ifindex */ |
235 | + nla_total_size(sizeof(u_int32_t)) /* ifindex */ | |
fbcd923c | 236 | #endif |
df6fb868 PM |
237 | + nla_total_size(sizeof(u_int32_t)) /* mark */ |
238 | + nla_total_size(sizeof(struct nfqnl_msg_packet_hw)) | |
239 | + nla_total_size(sizeof(struct nfqnl_msg_packet_timestamp)); | |
7af4cc3f | 240 | |
02f014d8 | 241 | outdev = entry->outdev; |
3e4ead4f | 242 | |
c463ac97 | 243 | switch ((enum nfqnl_config_mode)ACCESS_ONCE(queue->copy_mode)) { |
7af4cc3f HW |
244 | case NFQNL_COPY_META: |
245 | case NFQNL_COPY_NONE: | |
7af4cc3f | 246 | break; |
601e68e1 | 247 | |
7af4cc3f | 248 | case NFQNL_COPY_PACKET: |
e9f13cab | 249 | if (entskb->ip_summed == CHECKSUM_PARTIAL && |
c463ac97 | 250 | skb_checksum_help(entskb)) |
e7dfb09a | 251 | return NULL; |
c463ac97 ED |
252 | |
253 | data_len = ACCESS_ONCE(queue->copy_range); | |
254 | if (data_len == 0 || data_len > entskb->len) | |
3e4ead4f | 255 | data_len = entskb->len; |
601e68e1 | 256 | |
df6fb868 | 257 | size += nla_total_size(data_len); |
7af4cc3f | 258 | break; |
7af4cc3f HW |
259 | } |
260 | ||
7af4cc3f HW |
261 | |
262 | skb = alloc_skb(size, GFP_ATOMIC); | |
263 | if (!skb) | |
264 | goto nlmsg_failure; | |
601e68e1 | 265 | |
27a884dc | 266 | old_tail = skb->tail; |
601e68e1 | 267 | nlh = NLMSG_PUT(skb, 0, 0, |
7af4cc3f HW |
268 | NFNL_SUBSYS_QUEUE << 8 | NFQNL_MSG_PACKET, |
269 | sizeof(struct nfgenmsg)); | |
270 | nfmsg = NLMSG_DATA(nlh); | |
02f014d8 | 271 | nfmsg->nfgen_family = entry->pf; |
7af4cc3f HW |
272 | nfmsg->version = NFNETLINK_V0; |
273 | nfmsg->res_id = htons(queue->queue_num); | |
274 | ||
c463ac97 | 275 | entry->id = atomic_inc_return(&queue->id_sequence); |
7af4cc3f | 276 | pmsg.packet_id = htonl(entry->id); |
febf0a43 | 277 | pmsg.hw_protocol = entskb->protocol; |
02f014d8 | 278 | pmsg.hook = entry->hook; |
7af4cc3f | 279 | |
df6fb868 | 280 | NLA_PUT(skb, NFQA_PACKET_HDR, sizeof(pmsg), &pmsg); |
7af4cc3f | 281 | |
02f014d8 | 282 | indev = entry->indev; |
3e4ead4f | 283 | if (indev) { |
fbcd923c | 284 | #ifndef CONFIG_BRIDGE_NETFILTER |
ea3a66ff | 285 | NLA_PUT_BE32(skb, NFQA_IFINDEX_INDEV, htonl(indev->ifindex)); |
fbcd923c | 286 | #else |
02f014d8 | 287 | if (entry->pf == PF_BRIDGE) { |
fbcd923c | 288 | /* Case 1: indev is physical input device, we need to |
601e68e1 | 289 | * look for bridge group (when called from |
fbcd923c | 290 | * netfilter_bridge) */ |
ea3a66ff PM |
291 | NLA_PUT_BE32(skb, NFQA_IFINDEX_PHYSINDEV, |
292 | htonl(indev->ifindex)); | |
fbcd923c | 293 | /* this is the bridge group "brX" */ |
f350a0a8 | 294 | /* rcu_read_lock()ed by __nf_queue */ |
ea3a66ff | 295 | NLA_PUT_BE32(skb, NFQA_IFINDEX_INDEV, |
f350a0a8 | 296 | htonl(br_port_get_rcu(indev)->br->dev->ifindex)); |
fbcd923c HW |
297 | } else { |
298 | /* Case 2: indev is bridge group, we need to look for | |
299 | * physical device (when called from ipv4) */ | |
ea3a66ff PM |
300 | NLA_PUT_BE32(skb, NFQA_IFINDEX_INDEV, |
301 | htonl(indev->ifindex)); | |
302 | if (entskb->nf_bridge && entskb->nf_bridge->physindev) | |
303 | NLA_PUT_BE32(skb, NFQA_IFINDEX_PHYSINDEV, | |
304 | htonl(entskb->nf_bridge->physindev->ifindex)); | |
fbcd923c HW |
305 | } |
306 | #endif | |
7af4cc3f HW |
307 | } |
308 | ||
3e4ead4f | 309 | if (outdev) { |
fbcd923c | 310 | #ifndef CONFIG_BRIDGE_NETFILTER |
ea3a66ff | 311 | NLA_PUT_BE32(skb, NFQA_IFINDEX_OUTDEV, htonl(outdev->ifindex)); |
fbcd923c | 312 | #else |
02f014d8 | 313 | if (entry->pf == PF_BRIDGE) { |
fbcd923c | 314 | /* Case 1: outdev is physical output device, we need to |
601e68e1 | 315 | * look for bridge group (when called from |
fbcd923c | 316 | * netfilter_bridge) */ |
ea3a66ff PM |
317 | NLA_PUT_BE32(skb, NFQA_IFINDEX_PHYSOUTDEV, |
318 | htonl(outdev->ifindex)); | |
fbcd923c | 319 | /* this is the bridge group "brX" */ |
f350a0a8 | 320 | /* rcu_read_lock()ed by __nf_queue */ |
ea3a66ff | 321 | NLA_PUT_BE32(skb, NFQA_IFINDEX_OUTDEV, |
f350a0a8 | 322 | htonl(br_port_get_rcu(outdev)->br->dev->ifindex)); |
fbcd923c HW |
323 | } else { |
324 | /* Case 2: outdev is bridge group, we need to look for | |
325 | * physical output device (when called from ipv4) */ | |
ea3a66ff PM |
326 | NLA_PUT_BE32(skb, NFQA_IFINDEX_OUTDEV, |
327 | htonl(outdev->ifindex)); | |
328 | if (entskb->nf_bridge && entskb->nf_bridge->physoutdev) | |
329 | NLA_PUT_BE32(skb, NFQA_IFINDEX_PHYSOUTDEV, | |
330 | htonl(entskb->nf_bridge->physoutdev->ifindex)); | |
fbcd923c HW |
331 | } |
332 | #endif | |
7af4cc3f HW |
333 | } |
334 | ||
ea3a66ff PM |
335 | if (entskb->mark) |
336 | NLA_PUT_BE32(skb, NFQA_MARK, htonl(entskb->mark)); | |
7af4cc3f | 337 | |
b95cce35 | 338 | if (indev && entskb->dev) { |
7af4cc3f | 339 | struct nfqnl_msg_packet_hw phw; |
b95cce35 SH |
340 | int len = dev_parse_header(entskb, phw.hw_addr); |
341 | if (len) { | |
342 | phw.hw_addrlen = htons(len); | |
df6fb868 | 343 | NLA_PUT(skb, NFQA_HWADDR, sizeof(phw), &phw); |
b95cce35 | 344 | } |
7af4cc3f HW |
345 | } |
346 | ||
b7aa0bf7 | 347 | if (entskb->tstamp.tv64) { |
7af4cc3f | 348 | struct nfqnl_msg_packet_timestamp ts; |
b7aa0bf7 ED |
349 | struct timeval tv = ktime_to_timeval(entskb->tstamp); |
350 | ts.sec = cpu_to_be64(tv.tv_sec); | |
351 | ts.usec = cpu_to_be64(tv.tv_usec); | |
7af4cc3f | 352 | |
df6fb868 | 353 | NLA_PUT(skb, NFQA_TIMESTAMP, sizeof(ts), &ts); |
7af4cc3f HW |
354 | } |
355 | ||
356 | if (data_len) { | |
df6fb868 | 357 | struct nlattr *nla; |
ca7c48ca | 358 | int sz = nla_attr_size(data_len); |
7af4cc3f | 359 | |
df6fb868 | 360 | if (skb_tailroom(skb) < nla_total_size(data_len)) { |
7af4cc3f HW |
361 | printk(KERN_WARNING "nf_queue: no tailroom!\n"); |
362 | goto nlmsg_failure; | |
363 | } | |
364 | ||
df6fb868 PM |
365 | nla = (struct nlattr *)skb_put(skb, nla_total_size(data_len)); |
366 | nla->nla_type = NFQA_PAYLOAD; | |
ca7c48ca | 367 | nla->nla_len = sz; |
7af4cc3f | 368 | |
df6fb868 | 369 | if (skb_copy_bits(entskb, 0, nla_data(nla), data_len)) |
7af4cc3f HW |
370 | BUG(); |
371 | } | |
601e68e1 | 372 | |
7af4cc3f HW |
373 | nlh->nlmsg_len = skb->tail - old_tail; |
374 | return skb; | |
375 | ||
376 | nlmsg_failure: | |
df6fb868 | 377 | nla_put_failure: |
7af4cc3f HW |
378 | if (skb) |
379 | kfree_skb(skb); | |
7af4cc3f HW |
380 | if (net_ratelimit()) |
381 | printk(KERN_ERR "nf_queue: error creating packet message\n"); | |
382 | return NULL; | |
383 | } | |
384 | ||
385 | static int | |
02f014d8 | 386 | nfqnl_enqueue_packet(struct nf_queue_entry *entry, unsigned int queuenum) |
7af4cc3f | 387 | { |
7af4cc3f HW |
388 | struct sk_buff *nskb; |
389 | struct nfqnl_instance *queue; | |
0ef0f465 | 390 | int err; |
7af4cc3f | 391 | |
9872bec7 PM |
392 | /* rcu_read_lock()ed by nf_hook_slow() */ |
393 | queue = instance_lookup(queuenum); | |
2bd01197 | 394 | if (!queue) |
0ef0f465 | 395 | goto err_out; |
7af4cc3f | 396 | |
2bd01197 | 397 | if (queue->copy_mode == NFQNL_COPY_NONE) |
0ef0f465 | 398 | goto err_out; |
7af4cc3f | 399 | |
0ef0f465 | 400 | nskb = nfqnl_build_packet_message(queue, entry); |
7af4cc3f | 401 | if (nskb == NULL) |
0ef0f465 | 402 | goto err_out; |
601e68e1 | 403 | |
7af4cc3f | 404 | spin_lock_bh(&queue->lock); |
601e68e1 | 405 | |
7af4cc3f | 406 | if (!queue->peer_pid) |
601e68e1 | 407 | goto err_out_free_nskb; |
7af4cc3f HW |
408 | |
409 | if (queue->queue_total >= queue->queue_maxlen) { | |
601e68e1 | 410 | queue->queue_dropped++; |
7af4cc3f | 411 | if (net_ratelimit()) |
601e68e1 | 412 | printk(KERN_WARNING "nf_queue: full at %d entries, " |
a5d896ad EL |
413 | "dropping packets(s).\n", |
414 | queue->queue_total); | |
7af4cc3f HW |
415 | goto err_out_free_nskb; |
416 | } | |
417 | ||
418 | /* nfnetlink_unicast will either free the nskb or add it to a socket */ | |
cd8c20b6 | 419 | err = nfnetlink_unicast(nskb, &init_net, queue->peer_pid, MSG_DONTWAIT); |
0ef0f465 | 420 | if (err < 0) { |
601e68e1 | 421 | queue->queue_user_dropped++; |
7af4cc3f HW |
422 | goto err_out_unlock; |
423 | } | |
424 | ||
425 | __enqueue_entry(queue, entry); | |
426 | ||
427 | spin_unlock_bh(&queue->lock); | |
0ef0f465 | 428 | return 0; |
7af4cc3f HW |
429 | |
430 | err_out_free_nskb: | |
601e68e1 | 431 | kfree_skb(nskb); |
7af4cc3f HW |
432 | err_out_unlock: |
433 | spin_unlock_bh(&queue->lock); | |
0ef0f465 PM |
434 | err_out: |
435 | return -1; | |
7af4cc3f HW |
436 | } |
437 | ||
438 | static int | |
02f014d8 | 439 | nfqnl_mangle(void *data, int data_len, struct nf_queue_entry *e) |
7af4cc3f | 440 | { |
e2b58a67 | 441 | struct sk_buff *nskb; |
7af4cc3f HW |
442 | int diff; |
443 | ||
444 | diff = data_len - e->skb->len; | |
d8a585d7 PM |
445 | if (diff < 0) { |
446 | if (pskb_trim(e->skb, data_len)) | |
447 | return -ENOMEM; | |
448 | } else if (diff > 0) { | |
7af4cc3f HW |
449 | if (data_len > 0xFFFF) |
450 | return -EINVAL; | |
451 | if (diff > skb_tailroom(e->skb)) { | |
9a732ed6 AE |
452 | nskb = skb_copy_expand(e->skb, skb_headroom(e->skb), |
453 | diff, GFP_ATOMIC); | |
e2b58a67 | 454 | if (!nskb) { |
1158ba27 | 455 | printk(KERN_WARNING "nf_queue: OOM " |
7af4cc3f | 456 | "in mangle, dropping packet\n"); |
e2b58a67 | 457 | return -ENOMEM; |
7af4cc3f | 458 | } |
e2b58a67 PM |
459 | kfree_skb(e->skb); |
460 | e->skb = nskb; | |
7af4cc3f HW |
461 | } |
462 | skb_put(e->skb, diff); | |
463 | } | |
37d41879 | 464 | if (!skb_make_writable(e->skb, data_len)) |
7af4cc3f | 465 | return -ENOMEM; |
27d7ff46 | 466 | skb_copy_to_linear_data(e->skb, data, data_len); |
e7dfb09a | 467 | e->skb->ip_summed = CHECKSUM_NONE; |
7af4cc3f HW |
468 | return 0; |
469 | } | |
470 | ||
7af4cc3f HW |
471 | static int |
472 | nfqnl_set_mode(struct nfqnl_instance *queue, | |
473 | unsigned char mode, unsigned int range) | |
474 | { | |
c5de0dfd | 475 | int status = 0; |
7af4cc3f HW |
476 | |
477 | spin_lock_bh(&queue->lock); | |
c5de0dfd PM |
478 | switch (mode) { |
479 | case NFQNL_COPY_NONE: | |
480 | case NFQNL_COPY_META: | |
481 | queue->copy_mode = mode; | |
482 | queue->copy_range = 0; | |
483 | break; | |
484 | ||
485 | case NFQNL_COPY_PACKET: | |
486 | queue->copy_mode = mode; | |
487 | /* we're using struct nlattr which has 16bit nla_len */ | |
488 | if (range > 0xffff) | |
489 | queue->copy_range = 0xffff; | |
490 | else | |
491 | queue->copy_range = range; | |
492 | break; | |
493 | ||
494 | default: | |
495 | status = -EINVAL; | |
496 | ||
497 | } | |
7af4cc3f HW |
498 | spin_unlock_bh(&queue->lock); |
499 | ||
500 | return status; | |
501 | } | |
502 | ||
503 | static int | |
02f014d8 | 504 | dev_cmp(struct nf_queue_entry *entry, unsigned long ifindex) |
7af4cc3f | 505 | { |
02f014d8 PM |
506 | if (entry->indev) |
507 | if (entry->indev->ifindex == ifindex) | |
7af4cc3f | 508 | return 1; |
02f014d8 PM |
509 | if (entry->outdev) |
510 | if (entry->outdev->ifindex == ifindex) | |
7af4cc3f | 511 | return 1; |
ef47c6a7 PM |
512 | #ifdef CONFIG_BRIDGE_NETFILTER |
513 | if (entry->skb->nf_bridge) { | |
514 | if (entry->skb->nf_bridge->physindev && | |
515 | entry->skb->nf_bridge->physindev->ifindex == ifindex) | |
516 | return 1; | |
517 | if (entry->skb->nf_bridge->physoutdev && | |
518 | entry->skb->nf_bridge->physoutdev->ifindex == ifindex) | |
519 | return 1; | |
520 | } | |
521 | #endif | |
7af4cc3f HW |
522 | return 0; |
523 | } | |
524 | ||
525 | /* drop all packets with either indev or outdev == ifindex from all queue | |
526 | * instances */ | |
527 | static void | |
528 | nfqnl_dev_drop(int ifindex) | |
529 | { | |
530 | int i; | |
601e68e1 | 531 | |
9872bec7 | 532 | rcu_read_lock(); |
7af4cc3f | 533 | |
9872bec7 | 534 | for (i = 0; i < INSTANCE_BUCKETS; i++) { |
7af4cc3f HW |
535 | struct hlist_node *tmp; |
536 | struct nfqnl_instance *inst; | |
537 | struct hlist_head *head = &instance_table[i]; | |
538 | ||
9872bec7 | 539 | hlist_for_each_entry_rcu(inst, tmp, head, hlist) |
b43d8d85 | 540 | nfqnl_flush(inst, dev_cmp, ifindex); |
7af4cc3f HW |
541 | } |
542 | ||
9872bec7 | 543 | rcu_read_unlock(); |
7af4cc3f HW |
544 | } |
545 | ||
546 | #define RCV_SKB_FAIL(err) do { netlink_ack(skb, nlh, (err)); return; } while (0) | |
547 | ||
548 | static int | |
549 | nfqnl_rcv_dev_event(struct notifier_block *this, | |
550 | unsigned long event, void *ptr) | |
551 | { | |
552 | struct net_device *dev = ptr; | |
553 | ||
721499e8 | 554 | if (!net_eq(dev_net(dev), &init_net)) |
e9dc8653 EB |
555 | return NOTIFY_DONE; |
556 | ||
7af4cc3f HW |
557 | /* Drop any packets associated with the downed device */ |
558 | if (event == NETDEV_DOWN) | |
559 | nfqnl_dev_drop(dev->ifindex); | |
560 | return NOTIFY_DONE; | |
561 | } | |
562 | ||
563 | static struct notifier_block nfqnl_dev_notifier = { | |
564 | .notifier_call = nfqnl_rcv_dev_event, | |
565 | }; | |
566 | ||
567 | static int | |
568 | nfqnl_rcv_nl_event(struct notifier_block *this, | |
569 | unsigned long event, void *ptr) | |
570 | { | |
571 | struct netlink_notify *n = ptr; | |
572 | ||
dee5817e | 573 | if (event == NETLINK_URELEASE && n->protocol == NETLINK_NETFILTER) { |
7af4cc3f HW |
574 | int i; |
575 | ||
576 | /* destroy all instances for this pid */ | |
9872bec7 PM |
577 | spin_lock(&instances_lock); |
578 | for (i = 0; i < INSTANCE_BUCKETS; i++) { | |
7af4cc3f HW |
579 | struct hlist_node *tmp, *t2; |
580 | struct nfqnl_instance *inst; | |
581 | struct hlist_head *head = &instance_table[i]; | |
582 | ||
583 | hlist_for_each_entry_safe(inst, tmp, t2, head, hlist) { | |
b4b51029 EB |
584 | if ((n->net == &init_net) && |
585 | (n->pid == inst->peer_pid)) | |
7af4cc3f HW |
586 | __instance_destroy(inst); |
587 | } | |
588 | } | |
9872bec7 | 589 | spin_unlock(&instances_lock); |
7af4cc3f HW |
590 | } |
591 | return NOTIFY_DONE; | |
592 | } | |
593 | ||
594 | static struct notifier_block nfqnl_rtnl_notifier = { | |
595 | .notifier_call = nfqnl_rcv_nl_event, | |
596 | }; | |
597 | ||
5bf75853 PM |
598 | static const struct nla_policy nfqa_verdict_policy[NFQA_MAX+1] = { |
599 | [NFQA_VERDICT_HDR] = { .len = sizeof(struct nfqnl_msg_verdict_hdr) }, | |
600 | [NFQA_MARK] = { .type = NLA_U32 }, | |
601 | [NFQA_PAYLOAD] = { .type = NLA_UNSPEC }, | |
838ab636 HW |
602 | }; |
603 | ||
7af4cc3f HW |
604 | static int |
605 | nfqnl_recv_verdict(struct sock *ctnl, struct sk_buff *skb, | |
39938324 PM |
606 | const struct nlmsghdr *nlh, |
607 | const struct nlattr * const nfqa[]) | |
7af4cc3f HW |
608 | { |
609 | struct nfgenmsg *nfmsg = NLMSG_DATA(nlh); | |
610 | u_int16_t queue_num = ntohs(nfmsg->res_id); | |
611 | ||
612 | struct nfqnl_msg_verdict_hdr *vhdr; | |
613 | struct nfqnl_instance *queue; | |
614 | unsigned int verdict; | |
02f014d8 | 615 | struct nf_queue_entry *entry; |
838ab636 | 616 | int err; |
7af4cc3f | 617 | |
9872bec7 PM |
618 | rcu_read_lock(); |
619 | queue = instance_lookup(queue_num); | |
620 | if (!queue) { | |
621 | err = -ENODEV; | |
622 | goto err_out_unlock; | |
623 | } | |
7af4cc3f | 624 | |
838ab636 HW |
625 | if (queue->peer_pid != NETLINK_CB(skb).pid) { |
626 | err = -EPERM; | |
9872bec7 | 627 | goto err_out_unlock; |
838ab636 | 628 | } |
7af4cc3f | 629 | |
df6fb868 | 630 | if (!nfqa[NFQA_VERDICT_HDR]) { |
838ab636 | 631 | err = -EINVAL; |
9872bec7 | 632 | goto err_out_unlock; |
838ab636 | 633 | } |
7af4cc3f | 634 | |
df6fb868 | 635 | vhdr = nla_data(nfqa[NFQA_VERDICT_HDR]); |
7af4cc3f HW |
636 | verdict = ntohl(vhdr->verdict); |
637 | ||
838ab636 HW |
638 | if ((verdict & NF_VERDICT_MASK) > NF_MAX_VERDICT) { |
639 | err = -EINVAL; | |
9872bec7 | 640 | goto err_out_unlock; |
838ab636 | 641 | } |
7af4cc3f | 642 | |
b43d8d85 | 643 | entry = find_dequeue_entry(queue, ntohl(vhdr->id)); |
838ab636 HW |
644 | if (entry == NULL) { |
645 | err = -ENOENT; | |
9872bec7 | 646 | goto err_out_unlock; |
838ab636 | 647 | } |
9872bec7 | 648 | rcu_read_unlock(); |
7af4cc3f | 649 | |
df6fb868 PM |
650 | if (nfqa[NFQA_PAYLOAD]) { |
651 | if (nfqnl_mangle(nla_data(nfqa[NFQA_PAYLOAD]), | |
652 | nla_len(nfqa[NFQA_PAYLOAD]), entry) < 0) | |
7af4cc3f HW |
653 | verdict = NF_DROP; |
654 | } | |
655 | ||
df6fb868 | 656 | if (nfqa[NFQA_MARK]) |
ea3a66ff | 657 | entry->skb->mark = ntohl(nla_get_be32(nfqa[NFQA_MARK])); |
601e68e1 | 658 | |
4b3d15ef | 659 | nf_reinject(entry, verdict); |
7af4cc3f | 660 | return 0; |
838ab636 | 661 | |
9872bec7 PM |
662 | err_out_unlock: |
663 | rcu_read_unlock(); | |
838ab636 | 664 | return err; |
7af4cc3f HW |
665 | } |
666 | ||
667 | static int | |
668 | nfqnl_recv_unsupp(struct sock *ctnl, struct sk_buff *skb, | |
39938324 PM |
669 | const struct nlmsghdr *nlh, |
670 | const struct nlattr * const nfqa[]) | |
7af4cc3f HW |
671 | { |
672 | return -ENOTSUPP; | |
673 | } | |
674 | ||
5bf75853 PM |
675 | static const struct nla_policy nfqa_cfg_policy[NFQA_CFG_MAX+1] = { |
676 | [NFQA_CFG_CMD] = { .len = sizeof(struct nfqnl_msg_config_cmd) }, | |
677 | [NFQA_CFG_PARAMS] = { .len = sizeof(struct nfqnl_msg_config_params) }, | |
838ab636 HW |
678 | }; |
679 | ||
e3ac5298 | 680 | static const struct nf_queue_handler nfqh = { |
bbd86b9f HW |
681 | .name = "nf_queue", |
682 | .outfn = &nfqnl_enqueue_packet, | |
683 | }; | |
684 | ||
7af4cc3f HW |
685 | static int |
686 | nfqnl_recv_config(struct sock *ctnl, struct sk_buff *skb, | |
39938324 PM |
687 | const struct nlmsghdr *nlh, |
688 | const struct nlattr * const nfqa[]) | |
7af4cc3f HW |
689 | { |
690 | struct nfgenmsg *nfmsg = NLMSG_DATA(nlh); | |
691 | u_int16_t queue_num = ntohs(nfmsg->res_id); | |
692 | struct nfqnl_instance *queue; | |
9872bec7 | 693 | struct nfqnl_msg_config_cmd *cmd = NULL; |
838ab636 | 694 | int ret = 0; |
7af4cc3f | 695 | |
9872bec7 PM |
696 | if (nfqa[NFQA_CFG_CMD]) { |
697 | cmd = nla_data(nfqa[NFQA_CFG_CMD]); | |
698 | ||
699 | /* Commands without queue context - might sleep */ | |
700 | switch (cmd->command) { | |
701 | case NFQNL_CFG_CMD_PF_BIND: | |
914afea8 PM |
702 | return nf_register_queue_handler(ntohs(cmd->pf), |
703 | &nfqh); | |
9872bec7 | 704 | case NFQNL_CFG_CMD_PF_UNBIND: |
914afea8 PM |
705 | return nf_unregister_queue_handler(ntohs(cmd->pf), |
706 | &nfqh); | |
9872bec7 | 707 | } |
9872bec7 PM |
708 | } |
709 | ||
710 | rcu_read_lock(); | |
711 | queue = instance_lookup(queue_num); | |
a3c8e7fd PM |
712 | if (queue && queue->peer_pid != NETLINK_CB(skb).pid) { |
713 | ret = -EPERM; | |
9872bec7 | 714 | goto err_out_unlock; |
a3c8e7fd PM |
715 | } |
716 | ||
9872bec7 | 717 | if (cmd != NULL) { |
7af4cc3f HW |
718 | switch (cmd->command) { |
719 | case NFQNL_CFG_CMD_BIND: | |
9872bec7 PM |
720 | if (queue) { |
721 | ret = -EBUSY; | |
722 | goto err_out_unlock; | |
723 | } | |
7af4cc3f | 724 | queue = instance_create(queue_num, NETLINK_CB(skb).pid); |
baab2ce7 PM |
725 | if (IS_ERR(queue)) { |
726 | ret = PTR_ERR(queue); | |
9872bec7 PM |
727 | goto err_out_unlock; |
728 | } | |
7af4cc3f HW |
729 | break; |
730 | case NFQNL_CFG_CMD_UNBIND: | |
9872bec7 PM |
731 | if (!queue) { |
732 | ret = -ENODEV; | |
733 | goto err_out_unlock; | |
734 | } | |
7af4cc3f HW |
735 | instance_destroy(queue); |
736 | break; | |
737 | case NFQNL_CFG_CMD_PF_BIND: | |
7af4cc3f | 738 | case NFQNL_CFG_CMD_PF_UNBIND: |
7af4cc3f HW |
739 | break; |
740 | default: | |
cd21f0ac | 741 | ret = -ENOTSUPP; |
838ab636 | 742 | break; |
7af4cc3f | 743 | } |
7af4cc3f HW |
744 | } |
745 | ||
df6fb868 | 746 | if (nfqa[NFQA_CFG_PARAMS]) { |
7af4cc3f | 747 | struct nfqnl_msg_config_params *params; |
7af4cc3f | 748 | |
406dbfc9 | 749 | if (!queue) { |
a3c8e7fd | 750 | ret = -ENODEV; |
9872bec7 | 751 | goto err_out_unlock; |
406dbfc9 | 752 | } |
df6fb868 | 753 | params = nla_data(nfqa[NFQA_CFG_PARAMS]); |
7af4cc3f HW |
754 | nfqnl_set_mode(queue, params->copy_mode, |
755 | ntohl(params->copy_range)); | |
756 | } | |
757 | ||
df6fb868 | 758 | if (nfqa[NFQA_CFG_QUEUE_MAXLEN]) { |
829e17a1 | 759 | __be32 *queue_maxlen; |
a3c8e7fd PM |
760 | |
761 | if (!queue) { | |
762 | ret = -ENODEV; | |
9872bec7 | 763 | goto err_out_unlock; |
a3c8e7fd | 764 | } |
df6fb868 | 765 | queue_maxlen = nla_data(nfqa[NFQA_CFG_QUEUE_MAXLEN]); |
829e17a1 EL |
766 | spin_lock_bh(&queue->lock); |
767 | queue->queue_maxlen = ntohl(*queue_maxlen); | |
768 | spin_unlock_bh(&queue->lock); | |
769 | } | |
770 | ||
9872bec7 PM |
771 | err_out_unlock: |
772 | rcu_read_unlock(); | |
838ab636 | 773 | return ret; |
7af4cc3f HW |
774 | } |
775 | ||
7c8d4cb4 | 776 | static const struct nfnl_callback nfqnl_cb[NFQNL_MSG_MAX] = { |
7af4cc3f | 777 | [NFQNL_MSG_PACKET] = { .call = nfqnl_recv_unsupp, |
37d2e7a2 | 778 | .attr_count = NFQA_MAX, }, |
7af4cc3f | 779 | [NFQNL_MSG_VERDICT] = { .call = nfqnl_recv_verdict, |
5bf75853 PM |
780 | .attr_count = NFQA_MAX, |
781 | .policy = nfqa_verdict_policy }, | |
7af4cc3f | 782 | [NFQNL_MSG_CONFIG] = { .call = nfqnl_recv_config, |
5bf75853 PM |
783 | .attr_count = NFQA_CFG_MAX, |
784 | .policy = nfqa_cfg_policy }, | |
7af4cc3f HW |
785 | }; |
786 | ||
7c8d4cb4 | 787 | static const struct nfnetlink_subsystem nfqnl_subsys = { |
7af4cc3f HW |
788 | .name = "nf_queue", |
789 | .subsys_id = NFNL_SUBSYS_QUEUE, | |
790 | .cb_count = NFQNL_MSG_MAX, | |
7af4cc3f HW |
791 | .cb = nfqnl_cb, |
792 | }; | |
793 | ||
838ab636 HW |
794 | #ifdef CONFIG_PROC_FS |
795 | struct iter_state { | |
796 | unsigned int bucket; | |
797 | }; | |
798 | ||
799 | static struct hlist_node *get_first(struct seq_file *seq) | |
800 | { | |
801 | struct iter_state *st = seq->private; | |
802 | ||
803 | if (!st) | |
804 | return NULL; | |
805 | ||
806 | for (st->bucket = 0; st->bucket < INSTANCE_BUCKETS; st->bucket++) { | |
807 | if (!hlist_empty(&instance_table[st->bucket])) | |
808 | return instance_table[st->bucket].first; | |
809 | } | |
810 | return NULL; | |
811 | } | |
812 | ||
813 | static struct hlist_node *get_next(struct seq_file *seq, struct hlist_node *h) | |
814 | { | |
815 | struct iter_state *st = seq->private; | |
816 | ||
817 | h = h->next; | |
818 | while (!h) { | |
819 | if (++st->bucket >= INSTANCE_BUCKETS) | |
820 | return NULL; | |
821 | ||
822 | h = instance_table[st->bucket].first; | |
823 | } | |
824 | return h; | |
825 | } | |
826 | ||
827 | static struct hlist_node *get_idx(struct seq_file *seq, loff_t pos) | |
828 | { | |
829 | struct hlist_node *head; | |
830 | head = get_first(seq); | |
831 | ||
832 | if (head) | |
833 | while (pos && (head = get_next(seq, head))) | |
834 | pos--; | |
835 | return pos ? NULL : head; | |
836 | } | |
837 | ||
838 | static void *seq_start(struct seq_file *seq, loff_t *pos) | |
ca7c48ca | 839 | __acquires(instances_lock) |
838ab636 | 840 | { |
9872bec7 | 841 | spin_lock(&instances_lock); |
838ab636 HW |
842 | return get_idx(seq, *pos); |
843 | } | |
844 | ||
845 | static void *seq_next(struct seq_file *s, void *v, loff_t *pos) | |
846 | { | |
847 | (*pos)++; | |
848 | return get_next(s, v); | |
849 | } | |
850 | ||
851 | static void seq_stop(struct seq_file *s, void *v) | |
ca7c48ca | 852 | __releases(instances_lock) |
838ab636 | 853 | { |
9872bec7 | 854 | spin_unlock(&instances_lock); |
838ab636 HW |
855 | } |
856 | ||
857 | static int seq_show(struct seq_file *s, void *v) | |
858 | { | |
859 | const struct nfqnl_instance *inst = v; | |
860 | ||
861 | return seq_printf(s, "%5d %6d %5d %1d %5d %5d %5d %8d %2d\n", | |
862 | inst->queue_num, | |
863 | inst->peer_pid, inst->queue_total, | |
864 | inst->copy_mode, inst->copy_range, | |
865 | inst->queue_dropped, inst->queue_user_dropped, | |
c463ac97 | 866 | atomic_read(&inst->id_sequence), 1); |
838ab636 HW |
867 | } |
868 | ||
56b3d975 | 869 | static const struct seq_operations nfqnl_seq_ops = { |
838ab636 HW |
870 | .start = seq_start, |
871 | .next = seq_next, | |
872 | .stop = seq_stop, | |
873 | .show = seq_show, | |
874 | }; | |
875 | ||
876 | static int nfqnl_open(struct inode *inode, struct file *file) | |
877 | { | |
e2da5913 PE |
878 | return seq_open_private(file, &nfqnl_seq_ops, |
879 | sizeof(struct iter_state)); | |
838ab636 HW |
880 | } |
881 | ||
da7071d7 | 882 | static const struct file_operations nfqnl_file_ops = { |
838ab636 HW |
883 | .owner = THIS_MODULE, |
884 | .open = nfqnl_open, | |
885 | .read = seq_read, | |
886 | .llseek = seq_lseek, | |
887 | .release = seq_release_private, | |
888 | }; | |
889 | ||
890 | #endif /* PROC_FS */ | |
891 | ||
32292a7f | 892 | static int __init nfnetlink_queue_init(void) |
7af4cc3f | 893 | { |
838ab636 | 894 | int i, status = -ENOMEM; |
601e68e1 | 895 | |
838ab636 HW |
896 | for (i = 0; i < INSTANCE_BUCKETS; i++) |
897 | INIT_HLIST_HEAD(&instance_table[i]); | |
898 | ||
7af4cc3f HW |
899 | netlink_register_notifier(&nfqnl_rtnl_notifier); |
900 | status = nfnetlink_subsys_register(&nfqnl_subsys); | |
901 | if (status < 0) { | |
902 | printk(KERN_ERR "nf_queue: failed to create netlink socket\n"); | |
903 | goto cleanup_netlink_notifier; | |
904 | } | |
905 | ||
838ab636 | 906 | #ifdef CONFIG_PROC_FS |
8eeee8b1 DL |
907 | if (!proc_create("nfnetlink_queue", 0440, |
908 | proc_net_netfilter, &nfqnl_file_ops)) | |
838ab636 | 909 | goto cleanup_subsys; |
838ab636 HW |
910 | #endif |
911 | ||
7af4cc3f HW |
912 | register_netdevice_notifier(&nfqnl_dev_notifier); |
913 | return status; | |
914 | ||
838ab636 HW |
915 | #ifdef CONFIG_PROC_FS |
916 | cleanup_subsys: | |
7af4cc3f | 917 | nfnetlink_subsys_unregister(&nfqnl_subsys); |
32292a7f | 918 | #endif |
7af4cc3f HW |
919 | cleanup_netlink_notifier: |
920 | netlink_unregister_notifier(&nfqnl_rtnl_notifier); | |
921 | return status; | |
922 | } | |
923 | ||
65b4b4e8 | 924 | static void __exit nfnetlink_queue_fini(void) |
7af4cc3f | 925 | { |
32292a7f PM |
926 | nf_unregister_queue_handlers(&nfqh); |
927 | unregister_netdevice_notifier(&nfqnl_dev_notifier); | |
928 | #ifdef CONFIG_PROC_FS | |
929 | remove_proc_entry("nfnetlink_queue", proc_net_netfilter); | |
930 | #endif | |
931 | nfnetlink_subsys_unregister(&nfqnl_subsys); | |
932 | netlink_unregister_notifier(&nfqnl_rtnl_notifier); | |
67137f3c JDB |
933 | |
934 | rcu_barrier(); /* Wait for completion of call_rcu()'s */ | |
7af4cc3f HW |
935 | } |
936 | ||
937 | MODULE_DESCRIPTION("netfilter packet queue handler"); | |
938 | MODULE_AUTHOR("Harald Welte <laforge@netfilter.org>"); | |
939 | MODULE_LICENSE("GPL"); | |
940 | MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_QUEUE); | |
941 | ||
65b4b4e8 AM |
942 | module_init(nfnetlink_queue_init); |
943 | module_exit(nfnetlink_queue_fini); |