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Commit | Line | Data |
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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; | |
fdb694a0 | 55 | u_int32_t flags; /* Set using NFQA_CFG_FLAGS */ |
c463ac97 ED |
56 | /* |
57 | * Following fields are dirtied for each queued packet, | |
58 | * keep them in same cache line if possible. | |
59 | */ | |
60 | spinlock_t lock; | |
61 | unsigned int queue_total; | |
5863702a | 62 | unsigned int id_sequence; /* 'sequence' of pkt ids */ |
7af4cc3f HW |
63 | struct list_head queue_list; /* packets in queue */ |
64 | }; | |
65 | ||
02f014d8 | 66 | typedef int (*nfqnl_cmpfn)(struct nf_queue_entry *, unsigned long); |
7af4cc3f | 67 | |
9872bec7 | 68 | static DEFINE_SPINLOCK(instances_lock); |
7af4cc3f | 69 | |
7af4cc3f | 70 | #define INSTANCE_BUCKETS 16 |
9d6023ab | 71 | static struct hlist_head instance_table[INSTANCE_BUCKETS] __read_mostly; |
7af4cc3f HW |
72 | |
73 | static inline u_int8_t instance_hashfn(u_int16_t queue_num) | |
74 | { | |
75 | return ((queue_num >> 8) | queue_num) % INSTANCE_BUCKETS; | |
76 | } | |
77 | ||
78 | static struct nfqnl_instance * | |
9872bec7 | 79 | instance_lookup(u_int16_t queue_num) |
7af4cc3f HW |
80 | { |
81 | struct hlist_head *head; | |
82 | struct hlist_node *pos; | |
83 | struct nfqnl_instance *inst; | |
84 | ||
85 | head = &instance_table[instance_hashfn(queue_num)]; | |
9872bec7 | 86 | hlist_for_each_entry_rcu(inst, pos, head, hlist) { |
7af4cc3f HW |
87 | if (inst->queue_num == queue_num) |
88 | return inst; | |
89 | } | |
90 | return NULL; | |
91 | } | |
92 | ||
7af4cc3f HW |
93 | static struct nfqnl_instance * |
94 | instance_create(u_int16_t queue_num, int pid) | |
95 | { | |
baab2ce7 | 96 | struct nfqnl_instance *inst; |
9872bec7 | 97 | unsigned int h; |
baab2ce7 | 98 | int err; |
7af4cc3f | 99 | |
9872bec7 | 100 | spin_lock(&instances_lock); |
baab2ce7 PM |
101 | if (instance_lookup(queue_num)) { |
102 | err = -EEXIST; | |
7af4cc3f | 103 | goto out_unlock; |
baab2ce7 | 104 | } |
7af4cc3f | 105 | |
10dfdc69 | 106 | inst = kzalloc(sizeof(*inst), GFP_ATOMIC); |
baab2ce7 PM |
107 | if (!inst) { |
108 | err = -ENOMEM; | |
7af4cc3f | 109 | goto out_unlock; |
baab2ce7 | 110 | } |
7af4cc3f | 111 | |
7af4cc3f HW |
112 | inst->queue_num = queue_num; |
113 | inst->peer_pid = pid; | |
114 | inst->queue_maxlen = NFQNL_QMAX_DEFAULT; | |
115 | inst->copy_range = 0xfffff; | |
116 | inst->copy_mode = NFQNL_COPY_NONE; | |
181a46a5 | 117 | spin_lock_init(&inst->lock); |
7af4cc3f HW |
118 | INIT_LIST_HEAD(&inst->queue_list); |
119 | ||
baab2ce7 PM |
120 | if (!try_module_get(THIS_MODULE)) { |
121 | err = -EAGAIN; | |
7af4cc3f | 122 | goto out_free; |
baab2ce7 | 123 | } |
7af4cc3f | 124 | |
9872bec7 PM |
125 | h = instance_hashfn(queue_num); |
126 | hlist_add_head_rcu(&inst->hlist, &instance_table[h]); | |
7af4cc3f | 127 | |
9872bec7 | 128 | spin_unlock(&instances_lock); |
7af4cc3f | 129 | |
7af4cc3f HW |
130 | return inst; |
131 | ||
132 | out_free: | |
133 | kfree(inst); | |
134 | out_unlock: | |
9872bec7 | 135 | spin_unlock(&instances_lock); |
baab2ce7 | 136 | return ERR_PTR(err); |
7af4cc3f HW |
137 | } |
138 | ||
b43d8d85 PM |
139 | static void nfqnl_flush(struct nfqnl_instance *queue, nfqnl_cmpfn cmpfn, |
140 | unsigned long data); | |
7af4cc3f HW |
141 | |
142 | static void | |
9872bec7 | 143 | instance_destroy_rcu(struct rcu_head *head) |
7af4cc3f | 144 | { |
9872bec7 PM |
145 | struct nfqnl_instance *inst = container_of(head, struct nfqnl_instance, |
146 | rcu); | |
7af4cc3f | 147 | |
b43d8d85 | 148 | nfqnl_flush(inst, NULL, 0); |
9872bec7 | 149 | kfree(inst); |
7af4cc3f HW |
150 | module_put(THIS_MODULE); |
151 | } | |
152 | ||
9872bec7 | 153 | static void |
7af4cc3f HW |
154 | __instance_destroy(struct nfqnl_instance *inst) |
155 | { | |
9872bec7 PM |
156 | hlist_del_rcu(&inst->hlist); |
157 | call_rcu(&inst->rcu, instance_destroy_rcu); | |
7af4cc3f HW |
158 | } |
159 | ||
9872bec7 | 160 | static void |
7af4cc3f HW |
161 | instance_destroy(struct nfqnl_instance *inst) |
162 | { | |
9872bec7 PM |
163 | spin_lock(&instances_lock); |
164 | __instance_destroy(inst); | |
165 | spin_unlock(&instances_lock); | |
7af4cc3f HW |
166 | } |
167 | ||
7af4cc3f | 168 | static inline void |
02f014d8 | 169 | __enqueue_entry(struct nfqnl_instance *queue, struct nf_queue_entry *entry) |
7af4cc3f | 170 | { |
0ac41e81 | 171 | list_add_tail(&entry->list, &queue->queue_list); |
7af4cc3f HW |
172 | queue->queue_total++; |
173 | } | |
174 | ||
97d32cf9 FW |
175 | static void |
176 | __dequeue_entry(struct nfqnl_instance *queue, struct nf_queue_entry *entry) | |
177 | { | |
178 | list_del(&entry->list); | |
179 | queue->queue_total--; | |
180 | } | |
181 | ||
02f014d8 | 182 | static struct nf_queue_entry * |
b43d8d85 | 183 | find_dequeue_entry(struct nfqnl_instance *queue, unsigned int id) |
7af4cc3f | 184 | { |
02f014d8 | 185 | struct nf_queue_entry *entry = NULL, *i; |
601e68e1 | 186 | |
7af4cc3f | 187 | spin_lock_bh(&queue->lock); |
b43d8d85 PM |
188 | |
189 | list_for_each_entry(i, &queue->queue_list, list) { | |
190 | if (i->id == id) { | |
191 | entry = i; | |
192 | break; | |
193 | } | |
194 | } | |
195 | ||
97d32cf9 FW |
196 | if (entry) |
197 | __dequeue_entry(queue, entry); | |
b43d8d85 | 198 | |
7af4cc3f HW |
199 | spin_unlock_bh(&queue->lock); |
200 | ||
201 | return entry; | |
202 | } | |
203 | ||
204 | static void | |
b43d8d85 | 205 | nfqnl_flush(struct nfqnl_instance *queue, nfqnl_cmpfn cmpfn, unsigned long data) |
7af4cc3f | 206 | { |
02f014d8 | 207 | struct nf_queue_entry *entry, *next; |
b43d8d85 | 208 | |
7af4cc3f | 209 | spin_lock_bh(&queue->lock); |
b43d8d85 PM |
210 | list_for_each_entry_safe(entry, next, &queue->queue_list, list) { |
211 | if (!cmpfn || cmpfn(entry, data)) { | |
212 | list_del(&entry->list); | |
213 | queue->queue_total--; | |
4b3d15ef | 214 | nf_reinject(entry, NF_DROP); |
b43d8d85 PM |
215 | } |
216 | } | |
7af4cc3f HW |
217 | spin_unlock_bh(&queue->lock); |
218 | } | |
219 | ||
220 | static struct sk_buff * | |
221 | nfqnl_build_packet_message(struct nfqnl_instance *queue, | |
5863702a ED |
222 | struct nf_queue_entry *entry, |
223 | __be32 **packet_id_ptr) | |
7af4cc3f | 224 | { |
27a884dc | 225 | sk_buff_data_t old_tail; |
7af4cc3f HW |
226 | size_t size; |
227 | size_t data_len = 0; | |
228 | struct sk_buff *skb; | |
5863702a ED |
229 | struct nlattr *nla; |
230 | struct nfqnl_msg_packet_hdr *pmsg; | |
7af4cc3f HW |
231 | struct nlmsghdr *nlh; |
232 | struct nfgenmsg *nfmsg; | |
3e4ead4f JJ |
233 | struct sk_buff *entskb = entry->skb; |
234 | struct net_device *indev; | |
235 | struct net_device *outdev; | |
7af4cc3f | 236 | |
cabaa9bf | 237 | size = NLMSG_SPACE(sizeof(struct nfgenmsg)) |
df6fb868 PM |
238 | + nla_total_size(sizeof(struct nfqnl_msg_packet_hdr)) |
239 | + nla_total_size(sizeof(u_int32_t)) /* ifindex */ | |
240 | + nla_total_size(sizeof(u_int32_t)) /* ifindex */ | |
fbcd923c | 241 | #ifdef CONFIG_BRIDGE_NETFILTER |
df6fb868 PM |
242 | + nla_total_size(sizeof(u_int32_t)) /* ifindex */ |
243 | + nla_total_size(sizeof(u_int32_t)) /* ifindex */ | |
fbcd923c | 244 | #endif |
df6fb868 PM |
245 | + nla_total_size(sizeof(u_int32_t)) /* mark */ |
246 | + nla_total_size(sizeof(struct nfqnl_msg_packet_hw)) | |
247 | + nla_total_size(sizeof(struct nfqnl_msg_packet_timestamp)); | |
7af4cc3f | 248 | |
02f014d8 | 249 | outdev = entry->outdev; |
3e4ead4f | 250 | |
c463ac97 | 251 | switch ((enum nfqnl_config_mode)ACCESS_ONCE(queue->copy_mode)) { |
7af4cc3f HW |
252 | case NFQNL_COPY_META: |
253 | case NFQNL_COPY_NONE: | |
7af4cc3f | 254 | break; |
601e68e1 | 255 | |
7af4cc3f | 256 | case NFQNL_COPY_PACKET: |
e9f13cab | 257 | if (entskb->ip_summed == CHECKSUM_PARTIAL && |
c463ac97 | 258 | skb_checksum_help(entskb)) |
e7dfb09a | 259 | return NULL; |
c463ac97 ED |
260 | |
261 | data_len = ACCESS_ONCE(queue->copy_range); | |
262 | if (data_len == 0 || data_len > entskb->len) | |
3e4ead4f | 263 | data_len = entskb->len; |
601e68e1 | 264 | |
df6fb868 | 265 | size += nla_total_size(data_len); |
7af4cc3f | 266 | break; |
7af4cc3f HW |
267 | } |
268 | ||
7af4cc3f HW |
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 | ||
5863702a ED |
283 | nla = __nla_reserve(skb, NFQA_PACKET_HDR, sizeof(*pmsg)); |
284 | pmsg = nla_data(nla); | |
285 | pmsg->hw_protocol = entskb->protocol; | |
286 | pmsg->hook = entry->hook; | |
287 | *packet_id_ptr = &pmsg->packet_id; | |
7af4cc3f | 288 | |
02f014d8 | 289 | indev = entry->indev; |
3e4ead4f | 290 | if (indev) { |
fbcd923c | 291 | #ifndef CONFIG_BRIDGE_NETFILTER |
a447189e DM |
292 | if (nla_put_be32(skb, NFQA_IFINDEX_INDEV, htonl(indev->ifindex))) |
293 | goto nla_put_failure; | |
fbcd923c | 294 | #else |
02f014d8 | 295 | if (entry->pf == PF_BRIDGE) { |
fbcd923c | 296 | /* Case 1: indev is physical input device, we need to |
601e68e1 | 297 | * look for bridge group (when called from |
fbcd923c | 298 | * netfilter_bridge) */ |
a447189e DM |
299 | if (nla_put_be32(skb, NFQA_IFINDEX_PHYSINDEV, |
300 | htonl(indev->ifindex)) || | |
fbcd923c | 301 | /* this is the bridge group "brX" */ |
f350a0a8 | 302 | /* rcu_read_lock()ed by __nf_queue */ |
a447189e DM |
303 | nla_put_be32(skb, NFQA_IFINDEX_INDEV, |
304 | htonl(br_port_get_rcu(indev)->br->dev->ifindex))) | |
305 | goto nla_put_failure; | |
fbcd923c HW |
306 | } else { |
307 | /* Case 2: indev is bridge group, we need to look for | |
308 | * physical device (when called from ipv4) */ | |
a447189e DM |
309 | if (nla_put_be32(skb, NFQA_IFINDEX_INDEV, |
310 | htonl(indev->ifindex))) | |
311 | goto nla_put_failure; | |
312 | if (entskb->nf_bridge && entskb->nf_bridge->physindev && | |
313 | nla_put_be32(skb, NFQA_IFINDEX_PHYSINDEV, | |
314 | htonl(entskb->nf_bridge->physindev->ifindex))) | |
315 | goto nla_put_failure; | |
fbcd923c HW |
316 | } |
317 | #endif | |
7af4cc3f HW |
318 | } |
319 | ||
3e4ead4f | 320 | if (outdev) { |
fbcd923c | 321 | #ifndef CONFIG_BRIDGE_NETFILTER |
a447189e DM |
322 | if (nla_put_be32(skb, NFQA_IFINDEX_OUTDEV, htonl(outdev->ifindex))) |
323 | goto nla_put_failure; | |
fbcd923c | 324 | #else |
02f014d8 | 325 | if (entry->pf == PF_BRIDGE) { |
fbcd923c | 326 | /* Case 1: outdev is physical output device, we need to |
601e68e1 | 327 | * look for bridge group (when called from |
fbcd923c | 328 | * netfilter_bridge) */ |
a447189e DM |
329 | if (nla_put_be32(skb, NFQA_IFINDEX_PHYSOUTDEV, |
330 | htonl(outdev->ifindex)) || | |
fbcd923c | 331 | /* this is the bridge group "brX" */ |
f350a0a8 | 332 | /* rcu_read_lock()ed by __nf_queue */ |
a447189e DM |
333 | nla_put_be32(skb, NFQA_IFINDEX_OUTDEV, |
334 | htonl(br_port_get_rcu(outdev)->br->dev->ifindex))) | |
335 | goto nla_put_failure; | |
fbcd923c HW |
336 | } else { |
337 | /* Case 2: outdev is bridge group, we need to look for | |
338 | * physical output device (when called from ipv4) */ | |
a447189e DM |
339 | if (nla_put_be32(skb, NFQA_IFINDEX_OUTDEV, |
340 | htonl(outdev->ifindex))) | |
341 | goto nla_put_failure; | |
342 | if (entskb->nf_bridge && entskb->nf_bridge->physoutdev && | |
343 | nla_put_be32(skb, NFQA_IFINDEX_PHYSOUTDEV, | |
344 | htonl(entskb->nf_bridge->physoutdev->ifindex))) | |
345 | goto nla_put_failure; | |
fbcd923c HW |
346 | } |
347 | #endif | |
7af4cc3f HW |
348 | } |
349 | ||
a447189e DM |
350 | if (entskb->mark && |
351 | nla_put_be32(skb, NFQA_MARK, htonl(entskb->mark))) | |
352 | goto nla_put_failure; | |
7af4cc3f | 353 | |
2c38de4c NC |
354 | if (indev && entskb->dev && |
355 | entskb->mac_header != entskb->network_header) { | |
7af4cc3f | 356 | struct nfqnl_msg_packet_hw phw; |
b95cce35 SH |
357 | int len = dev_parse_header(entskb, phw.hw_addr); |
358 | if (len) { | |
359 | phw.hw_addrlen = htons(len); | |
a447189e DM |
360 | if (nla_put(skb, NFQA_HWADDR, sizeof(phw), &phw)) |
361 | goto nla_put_failure; | |
b95cce35 | 362 | } |
7af4cc3f HW |
363 | } |
364 | ||
b7aa0bf7 | 365 | if (entskb->tstamp.tv64) { |
7af4cc3f | 366 | struct nfqnl_msg_packet_timestamp ts; |
b7aa0bf7 ED |
367 | struct timeval tv = ktime_to_timeval(entskb->tstamp); |
368 | ts.sec = cpu_to_be64(tv.tv_sec); | |
369 | ts.usec = cpu_to_be64(tv.tv_usec); | |
7af4cc3f | 370 | |
a447189e DM |
371 | if (nla_put(skb, NFQA_TIMESTAMP, sizeof(ts), &ts)) |
372 | goto nla_put_failure; | |
7af4cc3f HW |
373 | } |
374 | ||
375 | if (data_len) { | |
df6fb868 | 376 | struct nlattr *nla; |
ca7c48ca | 377 | int sz = nla_attr_size(data_len); |
7af4cc3f | 378 | |
df6fb868 | 379 | if (skb_tailroom(skb) < nla_total_size(data_len)) { |
7af4cc3f HW |
380 | printk(KERN_WARNING "nf_queue: no tailroom!\n"); |
381 | goto nlmsg_failure; | |
382 | } | |
383 | ||
df6fb868 PM |
384 | nla = (struct nlattr *)skb_put(skb, nla_total_size(data_len)); |
385 | nla->nla_type = NFQA_PAYLOAD; | |
ca7c48ca | 386 | nla->nla_len = sz; |
7af4cc3f | 387 | |
df6fb868 | 388 | if (skb_copy_bits(entskb, 0, nla_data(nla), data_len)) |
7af4cc3f HW |
389 | BUG(); |
390 | } | |
601e68e1 | 391 | |
7af4cc3f HW |
392 | nlh->nlmsg_len = skb->tail - old_tail; |
393 | return skb; | |
394 | ||
395 | nlmsg_failure: | |
df6fb868 | 396 | nla_put_failure: |
7af4cc3f HW |
397 | if (skb) |
398 | kfree_skb(skb); | |
e87cc472 | 399 | net_err_ratelimited("nf_queue: error creating packet message\n"); |
7af4cc3f HW |
400 | return NULL; |
401 | } | |
402 | ||
403 | static int | |
02f014d8 | 404 | nfqnl_enqueue_packet(struct nf_queue_entry *entry, unsigned int queuenum) |
7af4cc3f | 405 | { |
7af4cc3f HW |
406 | struct sk_buff *nskb; |
407 | struct nfqnl_instance *queue; | |
f1585086 | 408 | int err = -ENOBUFS; |
5863702a | 409 | __be32 *packet_id_ptr; |
fdb694a0 | 410 | int failopen = 0; |
7af4cc3f | 411 | |
9872bec7 PM |
412 | /* rcu_read_lock()ed by nf_hook_slow() */ |
413 | queue = instance_lookup(queuenum); | |
f1585086 FW |
414 | if (!queue) { |
415 | err = -ESRCH; | |
0ef0f465 | 416 | goto err_out; |
f1585086 | 417 | } |
7af4cc3f | 418 | |
f1585086 FW |
419 | if (queue->copy_mode == NFQNL_COPY_NONE) { |
420 | err = -EINVAL; | |
0ef0f465 | 421 | goto err_out; |
f1585086 | 422 | } |
7af4cc3f | 423 | |
5863702a | 424 | nskb = nfqnl_build_packet_message(queue, entry, &packet_id_ptr); |
f1585086 FW |
425 | if (nskb == NULL) { |
426 | err = -ENOMEM; | |
0ef0f465 | 427 | goto err_out; |
f1585086 | 428 | } |
7af4cc3f | 429 | spin_lock_bh(&queue->lock); |
601e68e1 | 430 | |
f1585086 FW |
431 | if (!queue->peer_pid) { |
432 | err = -EINVAL; | |
601e68e1 | 433 | goto err_out_free_nskb; |
f1585086 | 434 | } |
7af4cc3f | 435 | if (queue->queue_total >= queue->queue_maxlen) { |
fdb694a0 KK |
436 | if (queue->flags & NFQA_CFG_F_FAIL_OPEN) { |
437 | failopen = 1; | |
438 | err = 0; | |
439 | } else { | |
440 | queue->queue_dropped++; | |
441 | net_warn_ratelimited("nf_queue: full at %d entries, dropping packets(s)\n", | |
442 | queue->queue_total); | |
443 | } | |
7af4cc3f HW |
444 | goto err_out_free_nskb; |
445 | } | |
5863702a ED |
446 | entry->id = ++queue->id_sequence; |
447 | *packet_id_ptr = htonl(entry->id); | |
7af4cc3f HW |
448 | |
449 | /* nfnetlink_unicast will either free the nskb or add it to a socket */ | |
cd8c20b6 | 450 | err = nfnetlink_unicast(nskb, &init_net, queue->peer_pid, MSG_DONTWAIT); |
0ef0f465 | 451 | if (err < 0) { |
601e68e1 | 452 | queue->queue_user_dropped++; |
7af4cc3f HW |
453 | goto err_out_unlock; |
454 | } | |
455 | ||
456 | __enqueue_entry(queue, entry); | |
457 | ||
458 | spin_unlock_bh(&queue->lock); | |
0ef0f465 | 459 | return 0; |
7af4cc3f HW |
460 | |
461 | err_out_free_nskb: | |
601e68e1 | 462 | kfree_skb(nskb); |
7af4cc3f HW |
463 | err_out_unlock: |
464 | spin_unlock_bh(&queue->lock); | |
fdb694a0 KK |
465 | if (failopen) |
466 | nf_reinject(entry, NF_ACCEPT); | |
0ef0f465 | 467 | err_out: |
f1585086 | 468 | return err; |
7af4cc3f HW |
469 | } |
470 | ||
471 | static int | |
02f014d8 | 472 | nfqnl_mangle(void *data, int data_len, struct nf_queue_entry *e) |
7af4cc3f | 473 | { |
e2b58a67 | 474 | struct sk_buff *nskb; |
7af4cc3f HW |
475 | int diff; |
476 | ||
477 | diff = data_len - e->skb->len; | |
d8a585d7 PM |
478 | if (diff < 0) { |
479 | if (pskb_trim(e->skb, data_len)) | |
480 | return -ENOMEM; | |
481 | } else if (diff > 0) { | |
7af4cc3f HW |
482 | if (data_len > 0xFFFF) |
483 | return -EINVAL; | |
484 | if (diff > skb_tailroom(e->skb)) { | |
9a732ed6 AE |
485 | nskb = skb_copy_expand(e->skb, skb_headroom(e->skb), |
486 | diff, GFP_ATOMIC); | |
e2b58a67 | 487 | if (!nskb) { |
1158ba27 | 488 | printk(KERN_WARNING "nf_queue: OOM " |
7af4cc3f | 489 | "in mangle, dropping packet\n"); |
e2b58a67 | 490 | return -ENOMEM; |
7af4cc3f | 491 | } |
e2b58a67 PM |
492 | kfree_skb(e->skb); |
493 | e->skb = nskb; | |
7af4cc3f HW |
494 | } |
495 | skb_put(e->skb, diff); | |
496 | } | |
37d41879 | 497 | if (!skb_make_writable(e->skb, data_len)) |
7af4cc3f | 498 | return -ENOMEM; |
27d7ff46 | 499 | skb_copy_to_linear_data(e->skb, data, data_len); |
e7dfb09a | 500 | e->skb->ip_summed = CHECKSUM_NONE; |
7af4cc3f HW |
501 | return 0; |
502 | } | |
503 | ||
7af4cc3f HW |
504 | static int |
505 | nfqnl_set_mode(struct nfqnl_instance *queue, | |
506 | unsigned char mode, unsigned int range) | |
507 | { | |
c5de0dfd | 508 | int status = 0; |
7af4cc3f HW |
509 | |
510 | spin_lock_bh(&queue->lock); | |
c5de0dfd PM |
511 | switch (mode) { |
512 | case NFQNL_COPY_NONE: | |
513 | case NFQNL_COPY_META: | |
514 | queue->copy_mode = mode; | |
515 | queue->copy_range = 0; | |
516 | break; | |
517 | ||
518 | case NFQNL_COPY_PACKET: | |
519 | queue->copy_mode = mode; | |
520 | /* we're using struct nlattr which has 16bit nla_len */ | |
521 | if (range > 0xffff) | |
522 | queue->copy_range = 0xffff; | |
523 | else | |
524 | queue->copy_range = range; | |
525 | break; | |
526 | ||
527 | default: | |
528 | status = -EINVAL; | |
529 | ||
530 | } | |
7af4cc3f HW |
531 | spin_unlock_bh(&queue->lock); |
532 | ||
533 | return status; | |
534 | } | |
535 | ||
536 | static int | |
02f014d8 | 537 | dev_cmp(struct nf_queue_entry *entry, unsigned long ifindex) |
7af4cc3f | 538 | { |
02f014d8 PM |
539 | if (entry->indev) |
540 | if (entry->indev->ifindex == ifindex) | |
7af4cc3f | 541 | return 1; |
02f014d8 PM |
542 | if (entry->outdev) |
543 | if (entry->outdev->ifindex == ifindex) | |
7af4cc3f | 544 | return 1; |
ef47c6a7 PM |
545 | #ifdef CONFIG_BRIDGE_NETFILTER |
546 | if (entry->skb->nf_bridge) { | |
547 | if (entry->skb->nf_bridge->physindev && | |
548 | entry->skb->nf_bridge->physindev->ifindex == ifindex) | |
549 | return 1; | |
550 | if (entry->skb->nf_bridge->physoutdev && | |
551 | entry->skb->nf_bridge->physoutdev->ifindex == ifindex) | |
552 | return 1; | |
553 | } | |
554 | #endif | |
7af4cc3f HW |
555 | return 0; |
556 | } | |
557 | ||
558 | /* drop all packets with either indev or outdev == ifindex from all queue | |
559 | * instances */ | |
560 | static void | |
561 | nfqnl_dev_drop(int ifindex) | |
562 | { | |
563 | int i; | |
601e68e1 | 564 | |
9872bec7 | 565 | rcu_read_lock(); |
7af4cc3f | 566 | |
9872bec7 | 567 | for (i = 0; i < INSTANCE_BUCKETS; i++) { |
7af4cc3f HW |
568 | struct hlist_node *tmp; |
569 | struct nfqnl_instance *inst; | |
570 | struct hlist_head *head = &instance_table[i]; | |
571 | ||
9872bec7 | 572 | hlist_for_each_entry_rcu(inst, tmp, head, hlist) |
b43d8d85 | 573 | nfqnl_flush(inst, dev_cmp, ifindex); |
7af4cc3f HW |
574 | } |
575 | ||
9872bec7 | 576 | rcu_read_unlock(); |
7af4cc3f HW |
577 | } |
578 | ||
579 | #define RCV_SKB_FAIL(err) do { netlink_ack(skb, nlh, (err)); return; } while (0) | |
580 | ||
581 | static int | |
582 | nfqnl_rcv_dev_event(struct notifier_block *this, | |
583 | unsigned long event, void *ptr) | |
584 | { | |
585 | struct net_device *dev = ptr; | |
586 | ||
721499e8 | 587 | if (!net_eq(dev_net(dev), &init_net)) |
e9dc8653 EB |
588 | return NOTIFY_DONE; |
589 | ||
7af4cc3f HW |
590 | /* Drop any packets associated with the downed device */ |
591 | if (event == NETDEV_DOWN) | |
592 | nfqnl_dev_drop(dev->ifindex); | |
593 | return NOTIFY_DONE; | |
594 | } | |
595 | ||
596 | static struct notifier_block nfqnl_dev_notifier = { | |
597 | .notifier_call = nfqnl_rcv_dev_event, | |
598 | }; | |
599 | ||
600 | static int | |
601 | nfqnl_rcv_nl_event(struct notifier_block *this, | |
602 | unsigned long event, void *ptr) | |
603 | { | |
604 | struct netlink_notify *n = ptr; | |
605 | ||
dee5817e | 606 | if (event == NETLINK_URELEASE && n->protocol == NETLINK_NETFILTER) { |
7af4cc3f HW |
607 | int i; |
608 | ||
609 | /* destroy all instances for this pid */ | |
9872bec7 PM |
610 | spin_lock(&instances_lock); |
611 | for (i = 0; i < INSTANCE_BUCKETS; i++) { | |
7af4cc3f HW |
612 | struct hlist_node *tmp, *t2; |
613 | struct nfqnl_instance *inst; | |
614 | struct hlist_head *head = &instance_table[i]; | |
615 | ||
616 | hlist_for_each_entry_safe(inst, tmp, t2, head, hlist) { | |
b4b51029 EB |
617 | if ((n->net == &init_net) && |
618 | (n->pid == inst->peer_pid)) | |
7af4cc3f HW |
619 | __instance_destroy(inst); |
620 | } | |
621 | } | |
9872bec7 | 622 | spin_unlock(&instances_lock); |
7af4cc3f HW |
623 | } |
624 | return NOTIFY_DONE; | |
625 | } | |
626 | ||
627 | static struct notifier_block nfqnl_rtnl_notifier = { | |
628 | .notifier_call = nfqnl_rcv_nl_event, | |
629 | }; | |
630 | ||
5bf75853 PM |
631 | static const struct nla_policy nfqa_verdict_policy[NFQA_MAX+1] = { |
632 | [NFQA_VERDICT_HDR] = { .len = sizeof(struct nfqnl_msg_verdict_hdr) }, | |
633 | [NFQA_MARK] = { .type = NLA_U32 }, | |
634 | [NFQA_PAYLOAD] = { .type = NLA_UNSPEC }, | |
838ab636 HW |
635 | }; |
636 | ||
97d32cf9 FW |
637 | static const struct nla_policy nfqa_verdict_batch_policy[NFQA_MAX+1] = { |
638 | [NFQA_VERDICT_HDR] = { .len = sizeof(struct nfqnl_msg_verdict_hdr) }, | |
639 | [NFQA_MARK] = { .type = NLA_U32 }, | |
640 | }; | |
641 | ||
642 | static struct nfqnl_instance *verdict_instance_lookup(u16 queue_num, int nlpid) | |
643 | { | |
644 | struct nfqnl_instance *queue; | |
645 | ||
646 | queue = instance_lookup(queue_num); | |
647 | if (!queue) | |
648 | return ERR_PTR(-ENODEV); | |
649 | ||
650 | if (queue->peer_pid != nlpid) | |
651 | return ERR_PTR(-EPERM); | |
652 | ||
653 | return queue; | |
654 | } | |
655 | ||
656 | static struct nfqnl_msg_verdict_hdr* | |
657 | verdicthdr_get(const struct nlattr * const nfqa[]) | |
658 | { | |
659 | struct nfqnl_msg_verdict_hdr *vhdr; | |
660 | unsigned int verdict; | |
661 | ||
662 | if (!nfqa[NFQA_VERDICT_HDR]) | |
663 | return NULL; | |
664 | ||
665 | vhdr = nla_data(nfqa[NFQA_VERDICT_HDR]); | |
c6675233 FW |
666 | verdict = ntohl(vhdr->verdict) & NF_VERDICT_MASK; |
667 | if (verdict > NF_MAX_VERDICT || verdict == NF_STOLEN) | |
97d32cf9 FW |
668 | return NULL; |
669 | return vhdr; | |
670 | } | |
671 | ||
672 | static int nfq_id_after(unsigned int id, unsigned int max) | |
673 | { | |
674 | return (int)(id - max) > 0; | |
675 | } | |
676 | ||
677 | static int | |
678 | nfqnl_recv_verdict_batch(struct sock *ctnl, struct sk_buff *skb, | |
679 | const struct nlmsghdr *nlh, | |
680 | const struct nlattr * const nfqa[]) | |
681 | { | |
682 | struct nfgenmsg *nfmsg = NLMSG_DATA(nlh); | |
683 | struct nf_queue_entry *entry, *tmp; | |
684 | unsigned int verdict, maxid; | |
685 | struct nfqnl_msg_verdict_hdr *vhdr; | |
686 | struct nfqnl_instance *queue; | |
687 | LIST_HEAD(batch_list); | |
688 | u16 queue_num = ntohs(nfmsg->res_id); | |
689 | ||
690 | queue = verdict_instance_lookup(queue_num, NETLINK_CB(skb).pid); | |
691 | if (IS_ERR(queue)) | |
692 | return PTR_ERR(queue); | |
693 | ||
694 | vhdr = verdicthdr_get(nfqa); | |
695 | if (!vhdr) | |
696 | return -EINVAL; | |
697 | ||
698 | verdict = ntohl(vhdr->verdict); | |
699 | maxid = ntohl(vhdr->id); | |
700 | ||
701 | spin_lock_bh(&queue->lock); | |
702 | ||
703 | list_for_each_entry_safe(entry, tmp, &queue->queue_list, list) { | |
704 | if (nfq_id_after(entry->id, maxid)) | |
705 | break; | |
706 | __dequeue_entry(queue, entry); | |
707 | list_add_tail(&entry->list, &batch_list); | |
708 | } | |
709 | ||
710 | spin_unlock_bh(&queue->lock); | |
711 | ||
712 | if (list_empty(&batch_list)) | |
713 | return -ENOENT; | |
714 | ||
715 | list_for_each_entry_safe(entry, tmp, &batch_list, list) { | |
716 | if (nfqa[NFQA_MARK]) | |
717 | entry->skb->mark = ntohl(nla_get_be32(nfqa[NFQA_MARK])); | |
718 | nf_reinject(entry, verdict); | |
719 | } | |
720 | return 0; | |
721 | } | |
722 | ||
7af4cc3f HW |
723 | static int |
724 | nfqnl_recv_verdict(struct sock *ctnl, struct sk_buff *skb, | |
39938324 PM |
725 | const struct nlmsghdr *nlh, |
726 | const struct nlattr * const nfqa[]) | |
7af4cc3f HW |
727 | { |
728 | struct nfgenmsg *nfmsg = NLMSG_DATA(nlh); | |
729 | u_int16_t queue_num = ntohs(nfmsg->res_id); | |
730 | ||
731 | struct nfqnl_msg_verdict_hdr *vhdr; | |
732 | struct nfqnl_instance *queue; | |
733 | unsigned int verdict; | |
02f014d8 | 734 | struct nf_queue_entry *entry; |
7af4cc3f | 735 | |
9872bec7 | 736 | queue = instance_lookup(queue_num); |
84a797dd | 737 | if (!queue) |
7af4cc3f | 738 | |
97d32cf9 FW |
739 | queue = verdict_instance_lookup(queue_num, NETLINK_CB(skb).pid); |
740 | if (IS_ERR(queue)) | |
741 | return PTR_ERR(queue); | |
7af4cc3f | 742 | |
97d32cf9 FW |
743 | vhdr = verdicthdr_get(nfqa); |
744 | if (!vhdr) | |
84a797dd | 745 | return -EINVAL; |
7af4cc3f | 746 | |
7af4cc3f HW |
747 | verdict = ntohl(vhdr->verdict); |
748 | ||
b43d8d85 | 749 | entry = find_dequeue_entry(queue, ntohl(vhdr->id)); |
84a797dd ED |
750 | if (entry == NULL) |
751 | return -ENOENT; | |
7af4cc3f | 752 | |
df6fb868 PM |
753 | if (nfqa[NFQA_PAYLOAD]) { |
754 | if (nfqnl_mangle(nla_data(nfqa[NFQA_PAYLOAD]), | |
755 | nla_len(nfqa[NFQA_PAYLOAD]), entry) < 0) | |
7af4cc3f HW |
756 | verdict = NF_DROP; |
757 | } | |
758 | ||
df6fb868 | 759 | if (nfqa[NFQA_MARK]) |
ea3a66ff | 760 | entry->skb->mark = ntohl(nla_get_be32(nfqa[NFQA_MARK])); |
601e68e1 | 761 | |
4b3d15ef | 762 | nf_reinject(entry, verdict); |
7af4cc3f HW |
763 | return 0; |
764 | } | |
765 | ||
766 | static int | |
767 | nfqnl_recv_unsupp(struct sock *ctnl, struct sk_buff *skb, | |
39938324 PM |
768 | const struct nlmsghdr *nlh, |
769 | const struct nlattr * const nfqa[]) | |
7af4cc3f HW |
770 | { |
771 | return -ENOTSUPP; | |
772 | } | |
773 | ||
5bf75853 PM |
774 | static const struct nla_policy nfqa_cfg_policy[NFQA_CFG_MAX+1] = { |
775 | [NFQA_CFG_CMD] = { .len = sizeof(struct nfqnl_msg_config_cmd) }, | |
776 | [NFQA_CFG_PARAMS] = { .len = sizeof(struct nfqnl_msg_config_params) }, | |
838ab636 HW |
777 | }; |
778 | ||
e3ac5298 | 779 | static const struct nf_queue_handler nfqh = { |
bbd86b9f HW |
780 | .name = "nf_queue", |
781 | .outfn = &nfqnl_enqueue_packet, | |
782 | }; | |
783 | ||
7af4cc3f HW |
784 | static int |
785 | nfqnl_recv_config(struct sock *ctnl, struct sk_buff *skb, | |
39938324 PM |
786 | const struct nlmsghdr *nlh, |
787 | const struct nlattr * const nfqa[]) | |
7af4cc3f HW |
788 | { |
789 | struct nfgenmsg *nfmsg = NLMSG_DATA(nlh); | |
790 | u_int16_t queue_num = ntohs(nfmsg->res_id); | |
791 | struct nfqnl_instance *queue; | |
9872bec7 | 792 | struct nfqnl_msg_config_cmd *cmd = NULL; |
838ab636 | 793 | int ret = 0; |
7af4cc3f | 794 | |
9872bec7 PM |
795 | if (nfqa[NFQA_CFG_CMD]) { |
796 | cmd = nla_data(nfqa[NFQA_CFG_CMD]); | |
797 | ||
798 | /* Commands without queue context - might sleep */ | |
799 | switch (cmd->command) { | |
800 | case NFQNL_CFG_CMD_PF_BIND: | |
914afea8 PM |
801 | return nf_register_queue_handler(ntohs(cmd->pf), |
802 | &nfqh); | |
9872bec7 | 803 | case NFQNL_CFG_CMD_PF_UNBIND: |
914afea8 PM |
804 | return nf_unregister_queue_handler(ntohs(cmd->pf), |
805 | &nfqh); | |
9872bec7 | 806 | } |
9872bec7 PM |
807 | } |
808 | ||
809 | rcu_read_lock(); | |
810 | queue = instance_lookup(queue_num); | |
a3c8e7fd PM |
811 | if (queue && queue->peer_pid != NETLINK_CB(skb).pid) { |
812 | ret = -EPERM; | |
9872bec7 | 813 | goto err_out_unlock; |
a3c8e7fd PM |
814 | } |
815 | ||
9872bec7 | 816 | if (cmd != NULL) { |
7af4cc3f HW |
817 | switch (cmd->command) { |
818 | case NFQNL_CFG_CMD_BIND: | |
9872bec7 PM |
819 | if (queue) { |
820 | ret = -EBUSY; | |
821 | goto err_out_unlock; | |
822 | } | |
7af4cc3f | 823 | queue = instance_create(queue_num, NETLINK_CB(skb).pid); |
baab2ce7 PM |
824 | if (IS_ERR(queue)) { |
825 | ret = PTR_ERR(queue); | |
9872bec7 PM |
826 | goto err_out_unlock; |
827 | } | |
7af4cc3f HW |
828 | break; |
829 | case NFQNL_CFG_CMD_UNBIND: | |
9872bec7 PM |
830 | if (!queue) { |
831 | ret = -ENODEV; | |
832 | goto err_out_unlock; | |
833 | } | |
7af4cc3f HW |
834 | instance_destroy(queue); |
835 | break; | |
836 | case NFQNL_CFG_CMD_PF_BIND: | |
7af4cc3f | 837 | case NFQNL_CFG_CMD_PF_UNBIND: |
7af4cc3f HW |
838 | break; |
839 | default: | |
cd21f0ac | 840 | ret = -ENOTSUPP; |
838ab636 | 841 | break; |
7af4cc3f | 842 | } |
7af4cc3f HW |
843 | } |
844 | ||
df6fb868 | 845 | if (nfqa[NFQA_CFG_PARAMS]) { |
7af4cc3f | 846 | struct nfqnl_msg_config_params *params; |
7af4cc3f | 847 | |
406dbfc9 | 848 | if (!queue) { |
a3c8e7fd | 849 | ret = -ENODEV; |
9872bec7 | 850 | goto err_out_unlock; |
406dbfc9 | 851 | } |
df6fb868 | 852 | params = nla_data(nfqa[NFQA_CFG_PARAMS]); |
7af4cc3f HW |
853 | nfqnl_set_mode(queue, params->copy_mode, |
854 | ntohl(params->copy_range)); | |
855 | } | |
856 | ||
df6fb868 | 857 | if (nfqa[NFQA_CFG_QUEUE_MAXLEN]) { |
829e17a1 | 858 | __be32 *queue_maxlen; |
a3c8e7fd PM |
859 | |
860 | if (!queue) { | |
861 | ret = -ENODEV; | |
9872bec7 | 862 | goto err_out_unlock; |
a3c8e7fd | 863 | } |
df6fb868 | 864 | queue_maxlen = nla_data(nfqa[NFQA_CFG_QUEUE_MAXLEN]); |
829e17a1 EL |
865 | spin_lock_bh(&queue->lock); |
866 | queue->queue_maxlen = ntohl(*queue_maxlen); | |
867 | spin_unlock_bh(&queue->lock); | |
868 | } | |
869 | ||
fdb694a0 KK |
870 | if (nfqa[NFQA_CFG_FLAGS]) { |
871 | __u32 flags, mask; | |
872 | ||
873 | if (!queue) { | |
874 | ret = -ENODEV; | |
875 | goto err_out_unlock; | |
876 | } | |
877 | ||
878 | if (!nfqa[NFQA_CFG_MASK]) { | |
879 | /* A mask is needed to specify which flags are being | |
880 | * changed. | |
881 | */ | |
882 | ret = -EINVAL; | |
883 | goto err_out_unlock; | |
884 | } | |
885 | ||
886 | flags = ntohl(nla_get_be32(nfqa[NFQA_CFG_FLAGS])); | |
887 | mask = ntohl(nla_get_be32(nfqa[NFQA_CFG_MASK])); | |
888 | ||
889 | spin_lock_bh(&queue->lock); | |
890 | queue->flags &= ~mask; | |
891 | queue->flags |= flags & mask; | |
892 | spin_unlock_bh(&queue->lock); | |
893 | } | |
894 | ||
9872bec7 PM |
895 | err_out_unlock: |
896 | rcu_read_unlock(); | |
838ab636 | 897 | return ret; |
7af4cc3f HW |
898 | } |
899 | ||
7c8d4cb4 | 900 | static const struct nfnl_callback nfqnl_cb[NFQNL_MSG_MAX] = { |
84a797dd | 901 | [NFQNL_MSG_PACKET] = { .call_rcu = nfqnl_recv_unsupp, |
37d2e7a2 | 902 | .attr_count = NFQA_MAX, }, |
84a797dd | 903 | [NFQNL_MSG_VERDICT] = { .call_rcu = nfqnl_recv_verdict, |
5bf75853 PM |
904 | .attr_count = NFQA_MAX, |
905 | .policy = nfqa_verdict_policy }, | |
7af4cc3f | 906 | [NFQNL_MSG_CONFIG] = { .call = nfqnl_recv_config, |
5bf75853 PM |
907 | .attr_count = NFQA_CFG_MAX, |
908 | .policy = nfqa_cfg_policy }, | |
97d32cf9 FW |
909 | [NFQNL_MSG_VERDICT_BATCH]={ .call_rcu = nfqnl_recv_verdict_batch, |
910 | .attr_count = NFQA_MAX, | |
911 | .policy = nfqa_verdict_batch_policy }, | |
7af4cc3f HW |
912 | }; |
913 | ||
7c8d4cb4 | 914 | static const struct nfnetlink_subsystem nfqnl_subsys = { |
7af4cc3f HW |
915 | .name = "nf_queue", |
916 | .subsys_id = NFNL_SUBSYS_QUEUE, | |
917 | .cb_count = NFQNL_MSG_MAX, | |
7af4cc3f HW |
918 | .cb = nfqnl_cb, |
919 | }; | |
920 | ||
838ab636 HW |
921 | #ifdef CONFIG_PROC_FS |
922 | struct iter_state { | |
923 | unsigned int bucket; | |
924 | }; | |
925 | ||
926 | static struct hlist_node *get_first(struct seq_file *seq) | |
927 | { | |
928 | struct iter_state *st = seq->private; | |
929 | ||
930 | if (!st) | |
931 | return NULL; | |
932 | ||
933 | for (st->bucket = 0; st->bucket < INSTANCE_BUCKETS; st->bucket++) { | |
934 | if (!hlist_empty(&instance_table[st->bucket])) | |
935 | return instance_table[st->bucket].first; | |
936 | } | |
937 | return NULL; | |
938 | } | |
939 | ||
940 | static struct hlist_node *get_next(struct seq_file *seq, struct hlist_node *h) | |
941 | { | |
942 | struct iter_state *st = seq->private; | |
943 | ||
944 | h = h->next; | |
945 | while (!h) { | |
946 | if (++st->bucket >= INSTANCE_BUCKETS) | |
947 | return NULL; | |
948 | ||
949 | h = instance_table[st->bucket].first; | |
950 | } | |
951 | return h; | |
952 | } | |
953 | ||
954 | static struct hlist_node *get_idx(struct seq_file *seq, loff_t pos) | |
955 | { | |
956 | struct hlist_node *head; | |
957 | head = get_first(seq); | |
958 | ||
959 | if (head) | |
960 | while (pos && (head = get_next(seq, head))) | |
961 | pos--; | |
962 | return pos ? NULL : head; | |
963 | } | |
964 | ||
965 | static void *seq_start(struct seq_file *seq, loff_t *pos) | |
ca7c48ca | 966 | __acquires(instances_lock) |
838ab636 | 967 | { |
9872bec7 | 968 | spin_lock(&instances_lock); |
838ab636 HW |
969 | return get_idx(seq, *pos); |
970 | } | |
971 | ||
972 | static void *seq_next(struct seq_file *s, void *v, loff_t *pos) | |
973 | { | |
974 | (*pos)++; | |
975 | return get_next(s, v); | |
976 | } | |
977 | ||
978 | static void seq_stop(struct seq_file *s, void *v) | |
ca7c48ca | 979 | __releases(instances_lock) |
838ab636 | 980 | { |
9872bec7 | 981 | spin_unlock(&instances_lock); |
838ab636 HW |
982 | } |
983 | ||
984 | static int seq_show(struct seq_file *s, void *v) | |
985 | { | |
986 | const struct nfqnl_instance *inst = v; | |
987 | ||
988 | return seq_printf(s, "%5d %6d %5d %1d %5d %5d %5d %8d %2d\n", | |
989 | inst->queue_num, | |
990 | inst->peer_pid, inst->queue_total, | |
991 | inst->copy_mode, inst->copy_range, | |
992 | inst->queue_dropped, inst->queue_user_dropped, | |
5863702a | 993 | inst->id_sequence, 1); |
838ab636 HW |
994 | } |
995 | ||
56b3d975 | 996 | static const struct seq_operations nfqnl_seq_ops = { |
838ab636 HW |
997 | .start = seq_start, |
998 | .next = seq_next, | |
999 | .stop = seq_stop, | |
1000 | .show = seq_show, | |
1001 | }; | |
1002 | ||
1003 | static int nfqnl_open(struct inode *inode, struct file *file) | |
1004 | { | |
e2da5913 PE |
1005 | return seq_open_private(file, &nfqnl_seq_ops, |
1006 | sizeof(struct iter_state)); | |
838ab636 HW |
1007 | } |
1008 | ||
da7071d7 | 1009 | static const struct file_operations nfqnl_file_ops = { |
838ab636 HW |
1010 | .owner = THIS_MODULE, |
1011 | .open = nfqnl_open, | |
1012 | .read = seq_read, | |
1013 | .llseek = seq_lseek, | |
1014 | .release = seq_release_private, | |
1015 | }; | |
1016 | ||
1017 | #endif /* PROC_FS */ | |
1018 | ||
32292a7f | 1019 | static int __init nfnetlink_queue_init(void) |
7af4cc3f | 1020 | { |
838ab636 | 1021 | int i, status = -ENOMEM; |
601e68e1 | 1022 | |
838ab636 HW |
1023 | for (i = 0; i < INSTANCE_BUCKETS; i++) |
1024 | INIT_HLIST_HEAD(&instance_table[i]); | |
1025 | ||
7af4cc3f HW |
1026 | netlink_register_notifier(&nfqnl_rtnl_notifier); |
1027 | status = nfnetlink_subsys_register(&nfqnl_subsys); | |
1028 | if (status < 0) { | |
1029 | printk(KERN_ERR "nf_queue: failed to create netlink socket\n"); | |
1030 | goto cleanup_netlink_notifier; | |
1031 | } | |
1032 | ||
838ab636 | 1033 | #ifdef CONFIG_PROC_FS |
8eeee8b1 DL |
1034 | if (!proc_create("nfnetlink_queue", 0440, |
1035 | proc_net_netfilter, &nfqnl_file_ops)) | |
838ab636 | 1036 | goto cleanup_subsys; |
838ab636 HW |
1037 | #endif |
1038 | ||
7af4cc3f HW |
1039 | register_netdevice_notifier(&nfqnl_dev_notifier); |
1040 | return status; | |
1041 | ||
838ab636 HW |
1042 | #ifdef CONFIG_PROC_FS |
1043 | cleanup_subsys: | |
7af4cc3f | 1044 | nfnetlink_subsys_unregister(&nfqnl_subsys); |
32292a7f | 1045 | #endif |
7af4cc3f HW |
1046 | cleanup_netlink_notifier: |
1047 | netlink_unregister_notifier(&nfqnl_rtnl_notifier); | |
1048 | return status; | |
1049 | } | |
1050 | ||
65b4b4e8 | 1051 | static void __exit nfnetlink_queue_fini(void) |
7af4cc3f | 1052 | { |
32292a7f PM |
1053 | nf_unregister_queue_handlers(&nfqh); |
1054 | unregister_netdevice_notifier(&nfqnl_dev_notifier); | |
1055 | #ifdef CONFIG_PROC_FS | |
1056 | remove_proc_entry("nfnetlink_queue", proc_net_netfilter); | |
1057 | #endif | |
1058 | nfnetlink_subsys_unregister(&nfqnl_subsys); | |
1059 | netlink_unregister_notifier(&nfqnl_rtnl_notifier); | |
67137f3c JDB |
1060 | |
1061 | rcu_barrier(); /* Wait for completion of call_rcu()'s */ | |
7af4cc3f HW |
1062 | } |
1063 | ||
1064 | MODULE_DESCRIPTION("netfilter packet queue handler"); | |
1065 | MODULE_AUTHOR("Harald Welte <laforge@netfilter.org>"); | |
1066 | MODULE_LICENSE("GPL"); | |
1067 | MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_QUEUE); | |
1068 | ||
65b4b4e8 AM |
1069 | module_init(nfnetlink_queue_init); |
1070 | module_exit(nfnetlink_queue_fini); |