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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> |
9cb01766 | 33 | #include <net/netfilter/nf_conntrack.h> |
7af4cc3f | 34 | |
60063497 | 35 | #include <linux/atomic.h> |
7af4cc3f | 36 | |
fbcd923c HW |
37 | #ifdef CONFIG_BRIDGE_NETFILTER |
38 | #include "../bridge/br_private.h" | |
39 | #endif | |
40 | ||
7af4cc3f HW |
41 | #define NFQNL_QMAX_DEFAULT 1024 |
42 | ||
7af4cc3f HW |
43 | struct nfqnl_instance { |
44 | struct hlist_node hlist; /* global list of queues */ | |
9872bec7 | 45 | struct rcu_head rcu; |
7af4cc3f HW |
46 | |
47 | int peer_pid; | |
48 | unsigned int queue_maxlen; | |
49 | unsigned int copy_range; | |
7af4cc3f HW |
50 | unsigned int queue_dropped; |
51 | unsigned int queue_user_dropped; | |
52 | ||
7af4cc3f HW |
53 | |
54 | u_int16_t queue_num; /* number of this queue */ | |
55 | u_int8_t copy_mode; | |
fdb694a0 | 56 | u_int32_t flags; /* Set using NFQA_CFG_FLAGS */ |
c463ac97 ED |
57 | /* |
58 | * Following fields are dirtied for each queued packet, | |
59 | * keep them in same cache line if possible. | |
60 | */ | |
61 | spinlock_t lock; | |
62 | unsigned int queue_total; | |
5863702a | 63 | unsigned int id_sequence; /* 'sequence' of pkt ids */ |
7af4cc3f HW |
64 | struct list_head queue_list; /* packets in queue */ |
65 | }; | |
66 | ||
02f014d8 | 67 | typedef int (*nfqnl_cmpfn)(struct nf_queue_entry *, unsigned long); |
7af4cc3f | 68 | |
9872bec7 | 69 | static DEFINE_SPINLOCK(instances_lock); |
7af4cc3f | 70 | |
7af4cc3f | 71 | #define INSTANCE_BUCKETS 16 |
9d6023ab | 72 | static struct hlist_head instance_table[INSTANCE_BUCKETS] __read_mostly; |
7af4cc3f HW |
73 | |
74 | static inline u_int8_t instance_hashfn(u_int16_t queue_num) | |
75 | { | |
76 | return ((queue_num >> 8) | queue_num) % INSTANCE_BUCKETS; | |
77 | } | |
78 | ||
79 | static struct nfqnl_instance * | |
9872bec7 | 80 | instance_lookup(u_int16_t queue_num) |
7af4cc3f HW |
81 | { |
82 | struct hlist_head *head; | |
83 | struct hlist_node *pos; | |
84 | struct nfqnl_instance *inst; | |
85 | ||
86 | head = &instance_table[instance_hashfn(queue_num)]; | |
9872bec7 | 87 | hlist_for_each_entry_rcu(inst, pos, head, hlist) { |
7af4cc3f HW |
88 | if (inst->queue_num == queue_num) |
89 | return inst; | |
90 | } | |
91 | return NULL; | |
92 | } | |
93 | ||
7af4cc3f HW |
94 | static struct nfqnl_instance * |
95 | instance_create(u_int16_t queue_num, int pid) | |
96 | { | |
baab2ce7 | 97 | struct nfqnl_instance *inst; |
9872bec7 | 98 | unsigned int h; |
baab2ce7 | 99 | int err; |
7af4cc3f | 100 | |
9872bec7 | 101 | spin_lock(&instances_lock); |
baab2ce7 PM |
102 | if (instance_lookup(queue_num)) { |
103 | err = -EEXIST; | |
7af4cc3f | 104 | goto out_unlock; |
baab2ce7 | 105 | } |
7af4cc3f | 106 | |
10dfdc69 | 107 | inst = kzalloc(sizeof(*inst), GFP_ATOMIC); |
baab2ce7 PM |
108 | if (!inst) { |
109 | err = -ENOMEM; | |
7af4cc3f | 110 | goto out_unlock; |
baab2ce7 | 111 | } |
7af4cc3f | 112 | |
7af4cc3f HW |
113 | inst->queue_num = queue_num; |
114 | inst->peer_pid = pid; | |
115 | inst->queue_maxlen = NFQNL_QMAX_DEFAULT; | |
116 | inst->copy_range = 0xfffff; | |
117 | inst->copy_mode = NFQNL_COPY_NONE; | |
181a46a5 | 118 | spin_lock_init(&inst->lock); |
7af4cc3f HW |
119 | INIT_LIST_HEAD(&inst->queue_list); |
120 | ||
baab2ce7 PM |
121 | if (!try_module_get(THIS_MODULE)) { |
122 | err = -EAGAIN; | |
7af4cc3f | 123 | goto out_free; |
baab2ce7 | 124 | } |
7af4cc3f | 125 | |
9872bec7 PM |
126 | h = instance_hashfn(queue_num); |
127 | hlist_add_head_rcu(&inst->hlist, &instance_table[h]); | |
7af4cc3f | 128 | |
9872bec7 | 129 | spin_unlock(&instances_lock); |
7af4cc3f | 130 | |
7af4cc3f HW |
131 | return inst; |
132 | ||
133 | out_free: | |
134 | kfree(inst); | |
135 | out_unlock: | |
9872bec7 | 136 | spin_unlock(&instances_lock); |
baab2ce7 | 137 | return ERR_PTR(err); |
7af4cc3f HW |
138 | } |
139 | ||
b43d8d85 PM |
140 | static void nfqnl_flush(struct nfqnl_instance *queue, nfqnl_cmpfn cmpfn, |
141 | unsigned long data); | |
7af4cc3f HW |
142 | |
143 | static void | |
9872bec7 | 144 | instance_destroy_rcu(struct rcu_head *head) |
7af4cc3f | 145 | { |
9872bec7 PM |
146 | struct nfqnl_instance *inst = container_of(head, struct nfqnl_instance, |
147 | rcu); | |
7af4cc3f | 148 | |
b43d8d85 | 149 | nfqnl_flush(inst, NULL, 0); |
9872bec7 | 150 | kfree(inst); |
7af4cc3f HW |
151 | module_put(THIS_MODULE); |
152 | } | |
153 | ||
9872bec7 | 154 | static void |
7af4cc3f HW |
155 | __instance_destroy(struct nfqnl_instance *inst) |
156 | { | |
9872bec7 PM |
157 | hlist_del_rcu(&inst->hlist); |
158 | call_rcu(&inst->rcu, instance_destroy_rcu); | |
7af4cc3f HW |
159 | } |
160 | ||
9872bec7 | 161 | static void |
7af4cc3f HW |
162 | instance_destroy(struct nfqnl_instance *inst) |
163 | { | |
9872bec7 PM |
164 | spin_lock(&instances_lock); |
165 | __instance_destroy(inst); | |
166 | spin_unlock(&instances_lock); | |
7af4cc3f HW |
167 | } |
168 | ||
7af4cc3f | 169 | static inline void |
02f014d8 | 170 | __enqueue_entry(struct nfqnl_instance *queue, struct nf_queue_entry *entry) |
7af4cc3f | 171 | { |
0ac41e81 | 172 | list_add_tail(&entry->list, &queue->queue_list); |
7af4cc3f HW |
173 | queue->queue_total++; |
174 | } | |
175 | ||
97d32cf9 FW |
176 | static void |
177 | __dequeue_entry(struct nfqnl_instance *queue, struct nf_queue_entry *entry) | |
178 | { | |
179 | list_del(&entry->list); | |
180 | queue->queue_total--; | |
181 | } | |
182 | ||
02f014d8 | 183 | static struct nf_queue_entry * |
b43d8d85 | 184 | find_dequeue_entry(struct nfqnl_instance *queue, unsigned int id) |
7af4cc3f | 185 | { |
02f014d8 | 186 | struct nf_queue_entry *entry = NULL, *i; |
601e68e1 | 187 | |
7af4cc3f | 188 | spin_lock_bh(&queue->lock); |
b43d8d85 PM |
189 | |
190 | list_for_each_entry(i, &queue->queue_list, list) { | |
191 | if (i->id == id) { | |
192 | entry = i; | |
193 | break; | |
194 | } | |
195 | } | |
196 | ||
97d32cf9 FW |
197 | if (entry) |
198 | __dequeue_entry(queue, entry); | |
b43d8d85 | 199 | |
7af4cc3f HW |
200 | spin_unlock_bh(&queue->lock); |
201 | ||
202 | return entry; | |
203 | } | |
204 | ||
205 | static void | |
b43d8d85 | 206 | nfqnl_flush(struct nfqnl_instance *queue, nfqnl_cmpfn cmpfn, unsigned long data) |
7af4cc3f | 207 | { |
02f014d8 | 208 | struct nf_queue_entry *entry, *next; |
b43d8d85 | 209 | |
7af4cc3f | 210 | spin_lock_bh(&queue->lock); |
b43d8d85 PM |
211 | list_for_each_entry_safe(entry, next, &queue->queue_list, list) { |
212 | if (!cmpfn || cmpfn(entry, data)) { | |
213 | list_del(&entry->list); | |
214 | queue->queue_total--; | |
4b3d15ef | 215 | nf_reinject(entry, NF_DROP); |
b43d8d85 PM |
216 | } |
217 | } | |
7af4cc3f HW |
218 | spin_unlock_bh(&queue->lock); |
219 | } | |
220 | ||
221 | static struct sk_buff * | |
222 | nfqnl_build_packet_message(struct nfqnl_instance *queue, | |
5863702a ED |
223 | struct nf_queue_entry *entry, |
224 | __be32 **packet_id_ptr) | |
7af4cc3f | 225 | { |
27a884dc | 226 | sk_buff_data_t old_tail; |
7af4cc3f HW |
227 | size_t size; |
228 | size_t data_len = 0; | |
229 | struct sk_buff *skb; | |
5863702a ED |
230 | struct nlattr *nla; |
231 | struct nfqnl_msg_packet_hdr *pmsg; | |
7af4cc3f HW |
232 | struct nlmsghdr *nlh; |
233 | struct nfgenmsg *nfmsg; | |
3e4ead4f JJ |
234 | struct sk_buff *entskb = entry->skb; |
235 | struct net_device *indev; | |
236 | struct net_device *outdev; | |
9cb01766 PNA |
237 | struct nfq_ct_hook *nfq_ct; |
238 | struct nf_conn *ct = NULL; | |
239 | enum ip_conntrack_info uninitialized_var(ctinfo); | |
7af4cc3f | 240 | |
cabaa9bf | 241 | size = NLMSG_SPACE(sizeof(struct nfgenmsg)) |
df6fb868 PM |
242 | + nla_total_size(sizeof(struct nfqnl_msg_packet_hdr)) |
243 | + nla_total_size(sizeof(u_int32_t)) /* ifindex */ | |
244 | + nla_total_size(sizeof(u_int32_t)) /* ifindex */ | |
fbcd923c | 245 | #ifdef CONFIG_BRIDGE_NETFILTER |
df6fb868 PM |
246 | + nla_total_size(sizeof(u_int32_t)) /* ifindex */ |
247 | + nla_total_size(sizeof(u_int32_t)) /* ifindex */ | |
fbcd923c | 248 | #endif |
df6fb868 PM |
249 | + nla_total_size(sizeof(u_int32_t)) /* mark */ |
250 | + nla_total_size(sizeof(struct nfqnl_msg_packet_hw)) | |
251 | + nla_total_size(sizeof(struct nfqnl_msg_packet_timestamp)); | |
7af4cc3f | 252 | |
02f014d8 | 253 | outdev = entry->outdev; |
3e4ead4f | 254 | |
c463ac97 | 255 | switch ((enum nfqnl_config_mode)ACCESS_ONCE(queue->copy_mode)) { |
7af4cc3f HW |
256 | case NFQNL_COPY_META: |
257 | case NFQNL_COPY_NONE: | |
7af4cc3f | 258 | break; |
601e68e1 | 259 | |
7af4cc3f | 260 | case NFQNL_COPY_PACKET: |
e9f13cab | 261 | if (entskb->ip_summed == CHECKSUM_PARTIAL && |
c463ac97 | 262 | skb_checksum_help(entskb)) |
e7dfb09a | 263 | return NULL; |
c463ac97 ED |
264 | |
265 | data_len = ACCESS_ONCE(queue->copy_range); | |
266 | if (data_len == 0 || data_len > entskb->len) | |
3e4ead4f | 267 | data_len = entskb->len; |
601e68e1 | 268 | |
df6fb868 | 269 | size += nla_total_size(data_len); |
7af4cc3f | 270 | break; |
7af4cc3f HW |
271 | } |
272 | ||
9cb01766 PNA |
273 | /* rcu_read_lock()ed by __nf_queue already. */ |
274 | nfq_ct = rcu_dereference(nfq_ct_hook); | |
275 | if (nfq_ct != NULL && (queue->flags & NFQA_CFG_F_CONNTRACK)) { | |
276 | ct = nf_ct_get(entskb, &ctinfo); | |
277 | if (ct) { | |
278 | if (!nf_ct_is_untracked(ct)) | |
279 | size += nfq_ct->build_size(ct); | |
280 | else | |
281 | ct = NULL; | |
282 | } | |
283 | } | |
7af4cc3f HW |
284 | |
285 | skb = alloc_skb(size, GFP_ATOMIC); | |
286 | if (!skb) | |
287 | goto nlmsg_failure; | |
601e68e1 | 288 | |
27a884dc | 289 | old_tail = skb->tail; |
601e68e1 | 290 | nlh = NLMSG_PUT(skb, 0, 0, |
7af4cc3f HW |
291 | NFNL_SUBSYS_QUEUE << 8 | NFQNL_MSG_PACKET, |
292 | sizeof(struct nfgenmsg)); | |
293 | nfmsg = NLMSG_DATA(nlh); | |
02f014d8 | 294 | nfmsg->nfgen_family = entry->pf; |
7af4cc3f HW |
295 | nfmsg->version = NFNETLINK_V0; |
296 | nfmsg->res_id = htons(queue->queue_num); | |
297 | ||
5863702a ED |
298 | nla = __nla_reserve(skb, NFQA_PACKET_HDR, sizeof(*pmsg)); |
299 | pmsg = nla_data(nla); | |
300 | pmsg->hw_protocol = entskb->protocol; | |
301 | pmsg->hook = entry->hook; | |
302 | *packet_id_ptr = &pmsg->packet_id; | |
7af4cc3f | 303 | |
02f014d8 | 304 | indev = entry->indev; |
3e4ead4f | 305 | if (indev) { |
fbcd923c | 306 | #ifndef CONFIG_BRIDGE_NETFILTER |
a447189e DM |
307 | if (nla_put_be32(skb, NFQA_IFINDEX_INDEV, htonl(indev->ifindex))) |
308 | goto nla_put_failure; | |
fbcd923c | 309 | #else |
02f014d8 | 310 | if (entry->pf == PF_BRIDGE) { |
fbcd923c | 311 | /* Case 1: indev is physical input device, we need to |
601e68e1 | 312 | * look for bridge group (when called from |
fbcd923c | 313 | * netfilter_bridge) */ |
a447189e DM |
314 | if (nla_put_be32(skb, NFQA_IFINDEX_PHYSINDEV, |
315 | htonl(indev->ifindex)) || | |
fbcd923c | 316 | /* this is the bridge group "brX" */ |
f350a0a8 | 317 | /* rcu_read_lock()ed by __nf_queue */ |
a447189e DM |
318 | nla_put_be32(skb, NFQA_IFINDEX_INDEV, |
319 | htonl(br_port_get_rcu(indev)->br->dev->ifindex))) | |
320 | goto nla_put_failure; | |
fbcd923c HW |
321 | } else { |
322 | /* Case 2: indev is bridge group, we need to look for | |
323 | * physical device (when called from ipv4) */ | |
a447189e DM |
324 | if (nla_put_be32(skb, NFQA_IFINDEX_INDEV, |
325 | htonl(indev->ifindex))) | |
326 | goto nla_put_failure; | |
327 | if (entskb->nf_bridge && entskb->nf_bridge->physindev && | |
328 | nla_put_be32(skb, NFQA_IFINDEX_PHYSINDEV, | |
329 | htonl(entskb->nf_bridge->physindev->ifindex))) | |
330 | goto nla_put_failure; | |
fbcd923c HW |
331 | } |
332 | #endif | |
7af4cc3f HW |
333 | } |
334 | ||
3e4ead4f | 335 | if (outdev) { |
fbcd923c | 336 | #ifndef CONFIG_BRIDGE_NETFILTER |
a447189e DM |
337 | if (nla_put_be32(skb, NFQA_IFINDEX_OUTDEV, htonl(outdev->ifindex))) |
338 | goto nla_put_failure; | |
fbcd923c | 339 | #else |
02f014d8 | 340 | if (entry->pf == PF_BRIDGE) { |
fbcd923c | 341 | /* Case 1: outdev is physical output device, we need to |
601e68e1 | 342 | * look for bridge group (when called from |
fbcd923c | 343 | * netfilter_bridge) */ |
a447189e DM |
344 | if (nla_put_be32(skb, NFQA_IFINDEX_PHYSOUTDEV, |
345 | htonl(outdev->ifindex)) || | |
fbcd923c | 346 | /* this is the bridge group "brX" */ |
f350a0a8 | 347 | /* rcu_read_lock()ed by __nf_queue */ |
a447189e DM |
348 | nla_put_be32(skb, NFQA_IFINDEX_OUTDEV, |
349 | htonl(br_port_get_rcu(outdev)->br->dev->ifindex))) | |
350 | goto nla_put_failure; | |
fbcd923c HW |
351 | } else { |
352 | /* Case 2: outdev is bridge group, we need to look for | |
353 | * physical output device (when called from ipv4) */ | |
a447189e DM |
354 | if (nla_put_be32(skb, NFQA_IFINDEX_OUTDEV, |
355 | htonl(outdev->ifindex))) | |
356 | goto nla_put_failure; | |
357 | if (entskb->nf_bridge && entskb->nf_bridge->physoutdev && | |
358 | nla_put_be32(skb, NFQA_IFINDEX_PHYSOUTDEV, | |
359 | htonl(entskb->nf_bridge->physoutdev->ifindex))) | |
360 | goto nla_put_failure; | |
fbcd923c HW |
361 | } |
362 | #endif | |
7af4cc3f HW |
363 | } |
364 | ||
a447189e DM |
365 | if (entskb->mark && |
366 | nla_put_be32(skb, NFQA_MARK, htonl(entskb->mark))) | |
367 | goto nla_put_failure; | |
7af4cc3f | 368 | |
2c38de4c NC |
369 | if (indev && entskb->dev && |
370 | entskb->mac_header != entskb->network_header) { | |
7af4cc3f | 371 | struct nfqnl_msg_packet_hw phw; |
b95cce35 SH |
372 | int len = dev_parse_header(entskb, phw.hw_addr); |
373 | if (len) { | |
374 | phw.hw_addrlen = htons(len); | |
a447189e DM |
375 | if (nla_put(skb, NFQA_HWADDR, sizeof(phw), &phw)) |
376 | goto nla_put_failure; | |
b95cce35 | 377 | } |
7af4cc3f HW |
378 | } |
379 | ||
b7aa0bf7 | 380 | if (entskb->tstamp.tv64) { |
7af4cc3f | 381 | struct nfqnl_msg_packet_timestamp ts; |
b7aa0bf7 ED |
382 | struct timeval tv = ktime_to_timeval(entskb->tstamp); |
383 | ts.sec = cpu_to_be64(tv.tv_sec); | |
384 | ts.usec = cpu_to_be64(tv.tv_usec); | |
7af4cc3f | 385 | |
a447189e DM |
386 | if (nla_put(skb, NFQA_TIMESTAMP, sizeof(ts), &ts)) |
387 | goto nla_put_failure; | |
7af4cc3f HW |
388 | } |
389 | ||
390 | if (data_len) { | |
df6fb868 | 391 | struct nlattr *nla; |
ca7c48ca | 392 | int sz = nla_attr_size(data_len); |
7af4cc3f | 393 | |
df6fb868 | 394 | if (skb_tailroom(skb) < nla_total_size(data_len)) { |
7af4cc3f HW |
395 | printk(KERN_WARNING "nf_queue: no tailroom!\n"); |
396 | goto nlmsg_failure; | |
397 | } | |
398 | ||
df6fb868 PM |
399 | nla = (struct nlattr *)skb_put(skb, nla_total_size(data_len)); |
400 | nla->nla_type = NFQA_PAYLOAD; | |
ca7c48ca | 401 | nla->nla_len = sz; |
7af4cc3f | 402 | |
df6fb868 | 403 | if (skb_copy_bits(entskb, 0, nla_data(nla), data_len)) |
7af4cc3f HW |
404 | BUG(); |
405 | } | |
601e68e1 | 406 | |
9cb01766 PNA |
407 | if (ct) { |
408 | struct nlattr *nest_parms; | |
409 | u_int32_t tmp; | |
410 | ||
411 | nest_parms = nla_nest_start(skb, NFQA_CT | NLA_F_NESTED); | |
412 | if (!nest_parms) | |
413 | goto nla_put_failure; | |
414 | ||
415 | if (nfq_ct->build(skb, ct) < 0) | |
416 | goto nla_put_failure; | |
417 | ||
418 | nla_nest_end(skb, nest_parms); | |
419 | ||
420 | tmp = ctinfo; | |
421 | if (nla_put_u32(skb, NFQA_CT_INFO, htonl(ctinfo))) | |
422 | goto nla_put_failure; | |
423 | } | |
424 | ||
7af4cc3f HW |
425 | nlh->nlmsg_len = skb->tail - old_tail; |
426 | return skb; | |
427 | ||
428 | nlmsg_failure: | |
df6fb868 | 429 | nla_put_failure: |
7af4cc3f HW |
430 | if (skb) |
431 | kfree_skb(skb); | |
e87cc472 | 432 | net_err_ratelimited("nf_queue: error creating packet message\n"); |
7af4cc3f HW |
433 | return NULL; |
434 | } | |
435 | ||
436 | static int | |
02f014d8 | 437 | nfqnl_enqueue_packet(struct nf_queue_entry *entry, unsigned int queuenum) |
7af4cc3f | 438 | { |
7af4cc3f HW |
439 | struct sk_buff *nskb; |
440 | struct nfqnl_instance *queue; | |
f1585086 | 441 | int err = -ENOBUFS; |
5863702a | 442 | __be32 *packet_id_ptr; |
fdb694a0 | 443 | int failopen = 0; |
7af4cc3f | 444 | |
9872bec7 PM |
445 | /* rcu_read_lock()ed by nf_hook_slow() */ |
446 | queue = instance_lookup(queuenum); | |
f1585086 FW |
447 | if (!queue) { |
448 | err = -ESRCH; | |
0ef0f465 | 449 | goto err_out; |
f1585086 | 450 | } |
7af4cc3f | 451 | |
f1585086 FW |
452 | if (queue->copy_mode == NFQNL_COPY_NONE) { |
453 | err = -EINVAL; | |
0ef0f465 | 454 | goto err_out; |
f1585086 | 455 | } |
7af4cc3f | 456 | |
5863702a | 457 | nskb = nfqnl_build_packet_message(queue, entry, &packet_id_ptr); |
f1585086 FW |
458 | if (nskb == NULL) { |
459 | err = -ENOMEM; | |
0ef0f465 | 460 | goto err_out; |
f1585086 | 461 | } |
7af4cc3f | 462 | spin_lock_bh(&queue->lock); |
601e68e1 | 463 | |
f1585086 FW |
464 | if (!queue->peer_pid) { |
465 | err = -EINVAL; | |
601e68e1 | 466 | goto err_out_free_nskb; |
f1585086 | 467 | } |
7af4cc3f | 468 | if (queue->queue_total >= queue->queue_maxlen) { |
fdb694a0 KK |
469 | if (queue->flags & NFQA_CFG_F_FAIL_OPEN) { |
470 | failopen = 1; | |
471 | err = 0; | |
472 | } else { | |
473 | queue->queue_dropped++; | |
474 | net_warn_ratelimited("nf_queue: full at %d entries, dropping packets(s)\n", | |
475 | queue->queue_total); | |
476 | } | |
7af4cc3f HW |
477 | goto err_out_free_nskb; |
478 | } | |
5863702a ED |
479 | entry->id = ++queue->id_sequence; |
480 | *packet_id_ptr = htonl(entry->id); | |
7af4cc3f HW |
481 | |
482 | /* nfnetlink_unicast will either free the nskb or add it to a socket */ | |
cd8c20b6 | 483 | err = nfnetlink_unicast(nskb, &init_net, queue->peer_pid, MSG_DONTWAIT); |
0ef0f465 | 484 | if (err < 0) { |
601e68e1 | 485 | queue->queue_user_dropped++; |
7af4cc3f HW |
486 | goto err_out_unlock; |
487 | } | |
488 | ||
489 | __enqueue_entry(queue, entry); | |
490 | ||
491 | spin_unlock_bh(&queue->lock); | |
0ef0f465 | 492 | return 0; |
7af4cc3f HW |
493 | |
494 | err_out_free_nskb: | |
601e68e1 | 495 | kfree_skb(nskb); |
7af4cc3f HW |
496 | err_out_unlock: |
497 | spin_unlock_bh(&queue->lock); | |
fdb694a0 KK |
498 | if (failopen) |
499 | nf_reinject(entry, NF_ACCEPT); | |
0ef0f465 | 500 | err_out: |
f1585086 | 501 | return err; |
7af4cc3f HW |
502 | } |
503 | ||
504 | static int | |
02f014d8 | 505 | nfqnl_mangle(void *data, int data_len, struct nf_queue_entry *e) |
7af4cc3f | 506 | { |
e2b58a67 | 507 | struct sk_buff *nskb; |
7af4cc3f HW |
508 | int diff; |
509 | ||
510 | diff = data_len - e->skb->len; | |
d8a585d7 PM |
511 | if (diff < 0) { |
512 | if (pskb_trim(e->skb, data_len)) | |
513 | return -ENOMEM; | |
514 | } else if (diff > 0) { | |
7af4cc3f HW |
515 | if (data_len > 0xFFFF) |
516 | return -EINVAL; | |
517 | if (diff > skb_tailroom(e->skb)) { | |
9a732ed6 AE |
518 | nskb = skb_copy_expand(e->skb, skb_headroom(e->skb), |
519 | diff, GFP_ATOMIC); | |
e2b58a67 | 520 | if (!nskb) { |
1158ba27 | 521 | printk(KERN_WARNING "nf_queue: OOM " |
7af4cc3f | 522 | "in mangle, dropping packet\n"); |
e2b58a67 | 523 | return -ENOMEM; |
7af4cc3f | 524 | } |
e2b58a67 PM |
525 | kfree_skb(e->skb); |
526 | e->skb = nskb; | |
7af4cc3f HW |
527 | } |
528 | skb_put(e->skb, diff); | |
529 | } | |
37d41879 | 530 | if (!skb_make_writable(e->skb, data_len)) |
7af4cc3f | 531 | return -ENOMEM; |
27d7ff46 | 532 | skb_copy_to_linear_data(e->skb, data, data_len); |
e7dfb09a | 533 | e->skb->ip_summed = CHECKSUM_NONE; |
7af4cc3f HW |
534 | return 0; |
535 | } | |
536 | ||
7af4cc3f HW |
537 | static int |
538 | nfqnl_set_mode(struct nfqnl_instance *queue, | |
539 | unsigned char mode, unsigned int range) | |
540 | { | |
c5de0dfd | 541 | int status = 0; |
7af4cc3f HW |
542 | |
543 | spin_lock_bh(&queue->lock); | |
c5de0dfd PM |
544 | switch (mode) { |
545 | case NFQNL_COPY_NONE: | |
546 | case NFQNL_COPY_META: | |
547 | queue->copy_mode = mode; | |
548 | queue->copy_range = 0; | |
549 | break; | |
550 | ||
551 | case NFQNL_COPY_PACKET: | |
552 | queue->copy_mode = mode; | |
553 | /* we're using struct nlattr which has 16bit nla_len */ | |
554 | if (range > 0xffff) | |
555 | queue->copy_range = 0xffff; | |
556 | else | |
557 | queue->copy_range = range; | |
558 | break; | |
559 | ||
560 | default: | |
561 | status = -EINVAL; | |
562 | ||
563 | } | |
7af4cc3f HW |
564 | spin_unlock_bh(&queue->lock); |
565 | ||
566 | return status; | |
567 | } | |
568 | ||
569 | static int | |
02f014d8 | 570 | dev_cmp(struct nf_queue_entry *entry, unsigned long ifindex) |
7af4cc3f | 571 | { |
02f014d8 PM |
572 | if (entry->indev) |
573 | if (entry->indev->ifindex == ifindex) | |
7af4cc3f | 574 | return 1; |
02f014d8 PM |
575 | if (entry->outdev) |
576 | if (entry->outdev->ifindex == ifindex) | |
7af4cc3f | 577 | return 1; |
ef47c6a7 PM |
578 | #ifdef CONFIG_BRIDGE_NETFILTER |
579 | if (entry->skb->nf_bridge) { | |
580 | if (entry->skb->nf_bridge->physindev && | |
581 | entry->skb->nf_bridge->physindev->ifindex == ifindex) | |
582 | return 1; | |
583 | if (entry->skb->nf_bridge->physoutdev && | |
584 | entry->skb->nf_bridge->physoutdev->ifindex == ifindex) | |
585 | return 1; | |
586 | } | |
587 | #endif | |
7af4cc3f HW |
588 | return 0; |
589 | } | |
590 | ||
591 | /* drop all packets with either indev or outdev == ifindex from all queue | |
592 | * instances */ | |
593 | static void | |
594 | nfqnl_dev_drop(int ifindex) | |
595 | { | |
596 | int i; | |
601e68e1 | 597 | |
9872bec7 | 598 | rcu_read_lock(); |
7af4cc3f | 599 | |
9872bec7 | 600 | for (i = 0; i < INSTANCE_BUCKETS; i++) { |
7af4cc3f HW |
601 | struct hlist_node *tmp; |
602 | struct nfqnl_instance *inst; | |
603 | struct hlist_head *head = &instance_table[i]; | |
604 | ||
9872bec7 | 605 | hlist_for_each_entry_rcu(inst, tmp, head, hlist) |
b43d8d85 | 606 | nfqnl_flush(inst, dev_cmp, ifindex); |
7af4cc3f HW |
607 | } |
608 | ||
9872bec7 | 609 | rcu_read_unlock(); |
7af4cc3f HW |
610 | } |
611 | ||
612 | #define RCV_SKB_FAIL(err) do { netlink_ack(skb, nlh, (err)); return; } while (0) | |
613 | ||
614 | static int | |
615 | nfqnl_rcv_dev_event(struct notifier_block *this, | |
616 | unsigned long event, void *ptr) | |
617 | { | |
618 | struct net_device *dev = ptr; | |
619 | ||
721499e8 | 620 | if (!net_eq(dev_net(dev), &init_net)) |
e9dc8653 EB |
621 | return NOTIFY_DONE; |
622 | ||
7af4cc3f HW |
623 | /* Drop any packets associated with the downed device */ |
624 | if (event == NETDEV_DOWN) | |
625 | nfqnl_dev_drop(dev->ifindex); | |
626 | return NOTIFY_DONE; | |
627 | } | |
628 | ||
629 | static struct notifier_block nfqnl_dev_notifier = { | |
630 | .notifier_call = nfqnl_rcv_dev_event, | |
631 | }; | |
632 | ||
633 | static int | |
634 | nfqnl_rcv_nl_event(struct notifier_block *this, | |
635 | unsigned long event, void *ptr) | |
636 | { | |
637 | struct netlink_notify *n = ptr; | |
638 | ||
dee5817e | 639 | if (event == NETLINK_URELEASE && n->protocol == NETLINK_NETFILTER) { |
7af4cc3f HW |
640 | int i; |
641 | ||
642 | /* destroy all instances for this pid */ | |
9872bec7 PM |
643 | spin_lock(&instances_lock); |
644 | for (i = 0; i < INSTANCE_BUCKETS; i++) { | |
7af4cc3f HW |
645 | struct hlist_node *tmp, *t2; |
646 | struct nfqnl_instance *inst; | |
647 | struct hlist_head *head = &instance_table[i]; | |
648 | ||
649 | hlist_for_each_entry_safe(inst, tmp, t2, head, hlist) { | |
b4b51029 EB |
650 | if ((n->net == &init_net) && |
651 | (n->pid == inst->peer_pid)) | |
7af4cc3f HW |
652 | __instance_destroy(inst); |
653 | } | |
654 | } | |
9872bec7 | 655 | spin_unlock(&instances_lock); |
7af4cc3f HW |
656 | } |
657 | return NOTIFY_DONE; | |
658 | } | |
659 | ||
660 | static struct notifier_block nfqnl_rtnl_notifier = { | |
661 | .notifier_call = nfqnl_rcv_nl_event, | |
662 | }; | |
663 | ||
5bf75853 PM |
664 | static const struct nla_policy nfqa_verdict_policy[NFQA_MAX+1] = { |
665 | [NFQA_VERDICT_HDR] = { .len = sizeof(struct nfqnl_msg_verdict_hdr) }, | |
666 | [NFQA_MARK] = { .type = NLA_U32 }, | |
667 | [NFQA_PAYLOAD] = { .type = NLA_UNSPEC }, | |
9cb01766 | 668 | [NFQA_CT] = { .type = NLA_UNSPEC }, |
838ab636 HW |
669 | }; |
670 | ||
97d32cf9 FW |
671 | static const struct nla_policy nfqa_verdict_batch_policy[NFQA_MAX+1] = { |
672 | [NFQA_VERDICT_HDR] = { .len = sizeof(struct nfqnl_msg_verdict_hdr) }, | |
673 | [NFQA_MARK] = { .type = NLA_U32 }, | |
674 | }; | |
675 | ||
676 | static struct nfqnl_instance *verdict_instance_lookup(u16 queue_num, int nlpid) | |
677 | { | |
678 | struct nfqnl_instance *queue; | |
679 | ||
680 | queue = instance_lookup(queue_num); | |
681 | if (!queue) | |
682 | return ERR_PTR(-ENODEV); | |
683 | ||
684 | if (queue->peer_pid != nlpid) | |
685 | return ERR_PTR(-EPERM); | |
686 | ||
687 | return queue; | |
688 | } | |
689 | ||
690 | static struct nfqnl_msg_verdict_hdr* | |
691 | verdicthdr_get(const struct nlattr * const nfqa[]) | |
692 | { | |
693 | struct nfqnl_msg_verdict_hdr *vhdr; | |
694 | unsigned int verdict; | |
695 | ||
696 | if (!nfqa[NFQA_VERDICT_HDR]) | |
697 | return NULL; | |
698 | ||
699 | vhdr = nla_data(nfqa[NFQA_VERDICT_HDR]); | |
c6675233 FW |
700 | verdict = ntohl(vhdr->verdict) & NF_VERDICT_MASK; |
701 | if (verdict > NF_MAX_VERDICT || verdict == NF_STOLEN) | |
97d32cf9 FW |
702 | return NULL; |
703 | return vhdr; | |
704 | } | |
705 | ||
706 | static int nfq_id_after(unsigned int id, unsigned int max) | |
707 | { | |
708 | return (int)(id - max) > 0; | |
709 | } | |
710 | ||
711 | static int | |
712 | nfqnl_recv_verdict_batch(struct sock *ctnl, struct sk_buff *skb, | |
713 | const struct nlmsghdr *nlh, | |
714 | const struct nlattr * const nfqa[]) | |
715 | { | |
716 | struct nfgenmsg *nfmsg = NLMSG_DATA(nlh); | |
717 | struct nf_queue_entry *entry, *tmp; | |
718 | unsigned int verdict, maxid; | |
719 | struct nfqnl_msg_verdict_hdr *vhdr; | |
720 | struct nfqnl_instance *queue; | |
721 | LIST_HEAD(batch_list); | |
722 | u16 queue_num = ntohs(nfmsg->res_id); | |
723 | ||
724 | queue = verdict_instance_lookup(queue_num, NETLINK_CB(skb).pid); | |
725 | if (IS_ERR(queue)) | |
726 | return PTR_ERR(queue); | |
727 | ||
728 | vhdr = verdicthdr_get(nfqa); | |
729 | if (!vhdr) | |
730 | return -EINVAL; | |
731 | ||
732 | verdict = ntohl(vhdr->verdict); | |
733 | maxid = ntohl(vhdr->id); | |
734 | ||
735 | spin_lock_bh(&queue->lock); | |
736 | ||
737 | list_for_each_entry_safe(entry, tmp, &queue->queue_list, list) { | |
738 | if (nfq_id_after(entry->id, maxid)) | |
739 | break; | |
740 | __dequeue_entry(queue, entry); | |
741 | list_add_tail(&entry->list, &batch_list); | |
742 | } | |
743 | ||
744 | spin_unlock_bh(&queue->lock); | |
745 | ||
746 | if (list_empty(&batch_list)) | |
747 | return -ENOENT; | |
748 | ||
749 | list_for_each_entry_safe(entry, tmp, &batch_list, list) { | |
750 | if (nfqa[NFQA_MARK]) | |
751 | entry->skb->mark = ntohl(nla_get_be32(nfqa[NFQA_MARK])); | |
752 | nf_reinject(entry, verdict); | |
753 | } | |
754 | return 0; | |
755 | } | |
756 | ||
7af4cc3f HW |
757 | static int |
758 | nfqnl_recv_verdict(struct sock *ctnl, struct sk_buff *skb, | |
39938324 PM |
759 | const struct nlmsghdr *nlh, |
760 | const struct nlattr * const nfqa[]) | |
7af4cc3f HW |
761 | { |
762 | struct nfgenmsg *nfmsg = NLMSG_DATA(nlh); | |
763 | u_int16_t queue_num = ntohs(nfmsg->res_id); | |
764 | ||
765 | struct nfqnl_msg_verdict_hdr *vhdr; | |
766 | struct nfqnl_instance *queue; | |
767 | unsigned int verdict; | |
02f014d8 | 768 | struct nf_queue_entry *entry; |
9cb01766 | 769 | struct nfq_ct_hook *nfq_ct; |
7af4cc3f | 770 | |
9872bec7 | 771 | queue = instance_lookup(queue_num); |
84a797dd | 772 | if (!queue) |
7af4cc3f | 773 | |
97d32cf9 FW |
774 | queue = verdict_instance_lookup(queue_num, NETLINK_CB(skb).pid); |
775 | if (IS_ERR(queue)) | |
776 | return PTR_ERR(queue); | |
7af4cc3f | 777 | |
97d32cf9 FW |
778 | vhdr = verdicthdr_get(nfqa); |
779 | if (!vhdr) | |
84a797dd | 780 | return -EINVAL; |
7af4cc3f | 781 | |
7af4cc3f HW |
782 | verdict = ntohl(vhdr->verdict); |
783 | ||
b43d8d85 | 784 | entry = find_dequeue_entry(queue, ntohl(vhdr->id)); |
84a797dd ED |
785 | if (entry == NULL) |
786 | return -ENOENT; | |
7af4cc3f | 787 | |
9cb01766 PNA |
788 | rcu_read_lock(); |
789 | nfq_ct = rcu_dereference(nfq_ct_hook); | |
790 | if (nfq_ct != NULL && | |
791 | (queue->flags & NFQA_CFG_F_CONNTRACK) && nfqa[NFQA_CT]) { | |
792 | enum ip_conntrack_info ctinfo; | |
793 | struct nf_conn *ct; | |
794 | ||
795 | ct = nf_ct_get(entry->skb, &ctinfo); | |
796 | if (ct && !nf_ct_is_untracked(ct)) | |
797 | nfq_ct->parse(nfqa[NFQA_CT], ct); | |
798 | } | |
799 | rcu_read_unlock(); | |
800 | ||
df6fb868 PM |
801 | if (nfqa[NFQA_PAYLOAD]) { |
802 | if (nfqnl_mangle(nla_data(nfqa[NFQA_PAYLOAD]), | |
803 | nla_len(nfqa[NFQA_PAYLOAD]), entry) < 0) | |
7af4cc3f HW |
804 | verdict = NF_DROP; |
805 | } | |
806 | ||
df6fb868 | 807 | if (nfqa[NFQA_MARK]) |
ea3a66ff | 808 | entry->skb->mark = ntohl(nla_get_be32(nfqa[NFQA_MARK])); |
601e68e1 | 809 | |
4b3d15ef | 810 | nf_reinject(entry, verdict); |
7af4cc3f HW |
811 | return 0; |
812 | } | |
813 | ||
814 | static int | |
815 | nfqnl_recv_unsupp(struct sock *ctnl, struct sk_buff *skb, | |
39938324 PM |
816 | const struct nlmsghdr *nlh, |
817 | const struct nlattr * const nfqa[]) | |
7af4cc3f HW |
818 | { |
819 | return -ENOTSUPP; | |
820 | } | |
821 | ||
5bf75853 PM |
822 | static const struct nla_policy nfqa_cfg_policy[NFQA_CFG_MAX+1] = { |
823 | [NFQA_CFG_CMD] = { .len = sizeof(struct nfqnl_msg_config_cmd) }, | |
824 | [NFQA_CFG_PARAMS] = { .len = sizeof(struct nfqnl_msg_config_params) }, | |
838ab636 HW |
825 | }; |
826 | ||
e3ac5298 | 827 | static const struct nf_queue_handler nfqh = { |
bbd86b9f HW |
828 | .name = "nf_queue", |
829 | .outfn = &nfqnl_enqueue_packet, | |
830 | }; | |
831 | ||
7af4cc3f HW |
832 | static int |
833 | nfqnl_recv_config(struct sock *ctnl, struct sk_buff *skb, | |
39938324 PM |
834 | const struct nlmsghdr *nlh, |
835 | const struct nlattr * const nfqa[]) | |
7af4cc3f HW |
836 | { |
837 | struct nfgenmsg *nfmsg = NLMSG_DATA(nlh); | |
838 | u_int16_t queue_num = ntohs(nfmsg->res_id); | |
839 | struct nfqnl_instance *queue; | |
9872bec7 | 840 | struct nfqnl_msg_config_cmd *cmd = NULL; |
838ab636 | 841 | int ret = 0; |
7af4cc3f | 842 | |
9872bec7 PM |
843 | if (nfqa[NFQA_CFG_CMD]) { |
844 | cmd = nla_data(nfqa[NFQA_CFG_CMD]); | |
845 | ||
846 | /* Commands without queue context - might sleep */ | |
847 | switch (cmd->command) { | |
848 | case NFQNL_CFG_CMD_PF_BIND: | |
914afea8 PM |
849 | return nf_register_queue_handler(ntohs(cmd->pf), |
850 | &nfqh); | |
9872bec7 | 851 | case NFQNL_CFG_CMD_PF_UNBIND: |
914afea8 PM |
852 | return nf_unregister_queue_handler(ntohs(cmd->pf), |
853 | &nfqh); | |
9872bec7 | 854 | } |
9872bec7 PM |
855 | } |
856 | ||
857 | rcu_read_lock(); | |
858 | queue = instance_lookup(queue_num); | |
a3c8e7fd PM |
859 | if (queue && queue->peer_pid != NETLINK_CB(skb).pid) { |
860 | ret = -EPERM; | |
9872bec7 | 861 | goto err_out_unlock; |
a3c8e7fd PM |
862 | } |
863 | ||
9872bec7 | 864 | if (cmd != NULL) { |
7af4cc3f HW |
865 | switch (cmd->command) { |
866 | case NFQNL_CFG_CMD_BIND: | |
9872bec7 PM |
867 | if (queue) { |
868 | ret = -EBUSY; | |
869 | goto err_out_unlock; | |
870 | } | |
7af4cc3f | 871 | queue = instance_create(queue_num, NETLINK_CB(skb).pid); |
baab2ce7 PM |
872 | if (IS_ERR(queue)) { |
873 | ret = PTR_ERR(queue); | |
9872bec7 PM |
874 | goto err_out_unlock; |
875 | } | |
7af4cc3f HW |
876 | break; |
877 | case NFQNL_CFG_CMD_UNBIND: | |
9872bec7 PM |
878 | if (!queue) { |
879 | ret = -ENODEV; | |
880 | goto err_out_unlock; | |
881 | } | |
7af4cc3f HW |
882 | instance_destroy(queue); |
883 | break; | |
884 | case NFQNL_CFG_CMD_PF_BIND: | |
7af4cc3f | 885 | case NFQNL_CFG_CMD_PF_UNBIND: |
7af4cc3f HW |
886 | break; |
887 | default: | |
cd21f0ac | 888 | ret = -ENOTSUPP; |
838ab636 | 889 | break; |
7af4cc3f | 890 | } |
7af4cc3f HW |
891 | } |
892 | ||
df6fb868 | 893 | if (nfqa[NFQA_CFG_PARAMS]) { |
7af4cc3f | 894 | struct nfqnl_msg_config_params *params; |
7af4cc3f | 895 | |
406dbfc9 | 896 | if (!queue) { |
a3c8e7fd | 897 | ret = -ENODEV; |
9872bec7 | 898 | goto err_out_unlock; |
406dbfc9 | 899 | } |
df6fb868 | 900 | params = nla_data(nfqa[NFQA_CFG_PARAMS]); |
7af4cc3f HW |
901 | nfqnl_set_mode(queue, params->copy_mode, |
902 | ntohl(params->copy_range)); | |
903 | } | |
904 | ||
df6fb868 | 905 | if (nfqa[NFQA_CFG_QUEUE_MAXLEN]) { |
829e17a1 | 906 | __be32 *queue_maxlen; |
a3c8e7fd PM |
907 | |
908 | if (!queue) { | |
909 | ret = -ENODEV; | |
9872bec7 | 910 | goto err_out_unlock; |
a3c8e7fd | 911 | } |
df6fb868 | 912 | queue_maxlen = nla_data(nfqa[NFQA_CFG_QUEUE_MAXLEN]); |
829e17a1 EL |
913 | spin_lock_bh(&queue->lock); |
914 | queue->queue_maxlen = ntohl(*queue_maxlen); | |
915 | spin_unlock_bh(&queue->lock); | |
916 | } | |
917 | ||
fdb694a0 KK |
918 | if (nfqa[NFQA_CFG_FLAGS]) { |
919 | __u32 flags, mask; | |
920 | ||
921 | if (!queue) { | |
922 | ret = -ENODEV; | |
923 | goto err_out_unlock; | |
924 | } | |
925 | ||
926 | if (!nfqa[NFQA_CFG_MASK]) { | |
927 | /* A mask is needed to specify which flags are being | |
928 | * changed. | |
929 | */ | |
930 | ret = -EINVAL; | |
931 | goto err_out_unlock; | |
932 | } | |
933 | ||
934 | flags = ntohl(nla_get_be32(nfqa[NFQA_CFG_FLAGS])); | |
935 | mask = ntohl(nla_get_be32(nfqa[NFQA_CFG_MASK])); | |
936 | ||
937 | spin_lock_bh(&queue->lock); | |
938 | queue->flags &= ~mask; | |
939 | queue->flags |= flags & mask; | |
940 | spin_unlock_bh(&queue->lock); | |
941 | } | |
942 | ||
9872bec7 PM |
943 | err_out_unlock: |
944 | rcu_read_unlock(); | |
838ab636 | 945 | return ret; |
7af4cc3f HW |
946 | } |
947 | ||
7c8d4cb4 | 948 | static const struct nfnl_callback nfqnl_cb[NFQNL_MSG_MAX] = { |
84a797dd | 949 | [NFQNL_MSG_PACKET] = { .call_rcu = nfqnl_recv_unsupp, |
37d2e7a2 | 950 | .attr_count = NFQA_MAX, }, |
84a797dd | 951 | [NFQNL_MSG_VERDICT] = { .call_rcu = nfqnl_recv_verdict, |
5bf75853 PM |
952 | .attr_count = NFQA_MAX, |
953 | .policy = nfqa_verdict_policy }, | |
7af4cc3f | 954 | [NFQNL_MSG_CONFIG] = { .call = nfqnl_recv_config, |
5bf75853 PM |
955 | .attr_count = NFQA_CFG_MAX, |
956 | .policy = nfqa_cfg_policy }, | |
97d32cf9 FW |
957 | [NFQNL_MSG_VERDICT_BATCH]={ .call_rcu = nfqnl_recv_verdict_batch, |
958 | .attr_count = NFQA_MAX, | |
959 | .policy = nfqa_verdict_batch_policy }, | |
7af4cc3f HW |
960 | }; |
961 | ||
7c8d4cb4 | 962 | static const struct nfnetlink_subsystem nfqnl_subsys = { |
7af4cc3f HW |
963 | .name = "nf_queue", |
964 | .subsys_id = NFNL_SUBSYS_QUEUE, | |
965 | .cb_count = NFQNL_MSG_MAX, | |
7af4cc3f HW |
966 | .cb = nfqnl_cb, |
967 | }; | |
968 | ||
838ab636 HW |
969 | #ifdef CONFIG_PROC_FS |
970 | struct iter_state { | |
971 | unsigned int bucket; | |
972 | }; | |
973 | ||
974 | static struct hlist_node *get_first(struct seq_file *seq) | |
975 | { | |
976 | struct iter_state *st = seq->private; | |
977 | ||
978 | if (!st) | |
979 | return NULL; | |
980 | ||
981 | for (st->bucket = 0; st->bucket < INSTANCE_BUCKETS; st->bucket++) { | |
982 | if (!hlist_empty(&instance_table[st->bucket])) | |
983 | return instance_table[st->bucket].first; | |
984 | } | |
985 | return NULL; | |
986 | } | |
987 | ||
988 | static struct hlist_node *get_next(struct seq_file *seq, struct hlist_node *h) | |
989 | { | |
990 | struct iter_state *st = seq->private; | |
991 | ||
992 | h = h->next; | |
993 | while (!h) { | |
994 | if (++st->bucket >= INSTANCE_BUCKETS) | |
995 | return NULL; | |
996 | ||
997 | h = instance_table[st->bucket].first; | |
998 | } | |
999 | return h; | |
1000 | } | |
1001 | ||
1002 | static struct hlist_node *get_idx(struct seq_file *seq, loff_t pos) | |
1003 | { | |
1004 | struct hlist_node *head; | |
1005 | head = get_first(seq); | |
1006 | ||
1007 | if (head) | |
1008 | while (pos && (head = get_next(seq, head))) | |
1009 | pos--; | |
1010 | return pos ? NULL : head; | |
1011 | } | |
1012 | ||
1013 | static void *seq_start(struct seq_file *seq, loff_t *pos) | |
ca7c48ca | 1014 | __acquires(instances_lock) |
838ab636 | 1015 | { |
9872bec7 | 1016 | spin_lock(&instances_lock); |
838ab636 HW |
1017 | return get_idx(seq, *pos); |
1018 | } | |
1019 | ||
1020 | static void *seq_next(struct seq_file *s, void *v, loff_t *pos) | |
1021 | { | |
1022 | (*pos)++; | |
1023 | return get_next(s, v); | |
1024 | } | |
1025 | ||
1026 | static void seq_stop(struct seq_file *s, void *v) | |
ca7c48ca | 1027 | __releases(instances_lock) |
838ab636 | 1028 | { |
9872bec7 | 1029 | spin_unlock(&instances_lock); |
838ab636 HW |
1030 | } |
1031 | ||
1032 | static int seq_show(struct seq_file *s, void *v) | |
1033 | { | |
1034 | const struct nfqnl_instance *inst = v; | |
1035 | ||
1036 | return seq_printf(s, "%5d %6d %5d %1d %5d %5d %5d %8d %2d\n", | |
1037 | inst->queue_num, | |
1038 | inst->peer_pid, inst->queue_total, | |
1039 | inst->copy_mode, inst->copy_range, | |
1040 | inst->queue_dropped, inst->queue_user_dropped, | |
5863702a | 1041 | inst->id_sequence, 1); |
838ab636 HW |
1042 | } |
1043 | ||
56b3d975 | 1044 | static const struct seq_operations nfqnl_seq_ops = { |
838ab636 HW |
1045 | .start = seq_start, |
1046 | .next = seq_next, | |
1047 | .stop = seq_stop, | |
1048 | .show = seq_show, | |
1049 | }; | |
1050 | ||
1051 | static int nfqnl_open(struct inode *inode, struct file *file) | |
1052 | { | |
e2da5913 PE |
1053 | return seq_open_private(file, &nfqnl_seq_ops, |
1054 | sizeof(struct iter_state)); | |
838ab636 HW |
1055 | } |
1056 | ||
da7071d7 | 1057 | static const struct file_operations nfqnl_file_ops = { |
838ab636 HW |
1058 | .owner = THIS_MODULE, |
1059 | .open = nfqnl_open, | |
1060 | .read = seq_read, | |
1061 | .llseek = seq_lseek, | |
1062 | .release = seq_release_private, | |
1063 | }; | |
1064 | ||
1065 | #endif /* PROC_FS */ | |
1066 | ||
32292a7f | 1067 | static int __init nfnetlink_queue_init(void) |
7af4cc3f | 1068 | { |
838ab636 | 1069 | int i, status = -ENOMEM; |
601e68e1 | 1070 | |
838ab636 HW |
1071 | for (i = 0; i < INSTANCE_BUCKETS; i++) |
1072 | INIT_HLIST_HEAD(&instance_table[i]); | |
1073 | ||
7af4cc3f HW |
1074 | netlink_register_notifier(&nfqnl_rtnl_notifier); |
1075 | status = nfnetlink_subsys_register(&nfqnl_subsys); | |
1076 | if (status < 0) { | |
1077 | printk(KERN_ERR "nf_queue: failed to create netlink socket\n"); | |
1078 | goto cleanup_netlink_notifier; | |
1079 | } | |
1080 | ||
838ab636 | 1081 | #ifdef CONFIG_PROC_FS |
8eeee8b1 DL |
1082 | if (!proc_create("nfnetlink_queue", 0440, |
1083 | proc_net_netfilter, &nfqnl_file_ops)) | |
838ab636 | 1084 | goto cleanup_subsys; |
838ab636 HW |
1085 | #endif |
1086 | ||
7af4cc3f HW |
1087 | register_netdevice_notifier(&nfqnl_dev_notifier); |
1088 | return status; | |
1089 | ||
838ab636 HW |
1090 | #ifdef CONFIG_PROC_FS |
1091 | cleanup_subsys: | |
7af4cc3f | 1092 | nfnetlink_subsys_unregister(&nfqnl_subsys); |
32292a7f | 1093 | #endif |
7af4cc3f HW |
1094 | cleanup_netlink_notifier: |
1095 | netlink_unregister_notifier(&nfqnl_rtnl_notifier); | |
1096 | return status; | |
1097 | } | |
1098 | ||
65b4b4e8 | 1099 | static void __exit nfnetlink_queue_fini(void) |
7af4cc3f | 1100 | { |
32292a7f PM |
1101 | nf_unregister_queue_handlers(&nfqh); |
1102 | unregister_netdevice_notifier(&nfqnl_dev_notifier); | |
1103 | #ifdef CONFIG_PROC_FS | |
1104 | remove_proc_entry("nfnetlink_queue", proc_net_netfilter); | |
1105 | #endif | |
1106 | nfnetlink_subsys_unregister(&nfqnl_subsys); | |
1107 | netlink_unregister_notifier(&nfqnl_rtnl_notifier); | |
67137f3c JDB |
1108 | |
1109 | rcu_barrier(); /* Wait for completion of call_rcu()'s */ | |
7af4cc3f HW |
1110 | } |
1111 | ||
1112 | MODULE_DESCRIPTION("netfilter packet queue handler"); | |
1113 | MODULE_AUTHOR("Harald Welte <laforge@netfilter.org>"); | |
1114 | MODULE_LICENSE("GPL"); | |
1115 | MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_QUEUE); | |
1116 | ||
65b4b4e8 AM |
1117 | module_init(nfnetlink_queue_init); |
1118 | module_exit(nfnetlink_queue_fini); |