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> |
e8179610 | 33 | #include <net/netns/generic.h> |
7c622345 | 34 | #include <net/netfilter/nfnetlink_queue.h> |
7af4cc3f | 35 | |
60063497 | 36 | #include <linux/atomic.h> |
7af4cc3f | 37 | |
fbcd923c HW |
38 | #ifdef CONFIG_BRIDGE_NETFILTER |
39 | #include "../bridge/br_private.h" | |
40 | #endif | |
41 | ||
7af4cc3f HW |
42 | #define NFQNL_QMAX_DEFAULT 1024 |
43 | ||
7af4cc3f HW |
44 | struct nfqnl_instance { |
45 | struct hlist_node hlist; /* global list of queues */ | |
9872bec7 | 46 | struct rcu_head rcu; |
7af4cc3f | 47 | |
15e47304 | 48 | int peer_portid; |
7af4cc3f HW |
49 | unsigned int queue_maxlen; |
50 | unsigned int copy_range; | |
7af4cc3f HW |
51 | unsigned int queue_dropped; |
52 | unsigned int queue_user_dropped; | |
53 | ||
7af4cc3f HW |
54 | |
55 | u_int16_t queue_num; /* number of this queue */ | |
56 | u_int8_t copy_mode; | |
fdb694a0 | 57 | u_int32_t flags; /* Set using NFQA_CFG_FLAGS */ |
c463ac97 ED |
58 | /* |
59 | * Following fields are dirtied for each queued packet, | |
60 | * keep them in same cache line if possible. | |
61 | */ | |
62 | spinlock_t lock; | |
63 | unsigned int queue_total; | |
5863702a | 64 | unsigned int id_sequence; /* 'sequence' of pkt ids */ |
7af4cc3f HW |
65 | struct list_head queue_list; /* packets in queue */ |
66 | }; | |
67 | ||
02f014d8 | 68 | typedef int (*nfqnl_cmpfn)(struct nf_queue_entry *, unsigned long); |
7af4cc3f | 69 | |
e8179610 | 70 | static int nfnl_queue_net_id __read_mostly; |
7af4cc3f | 71 | |
7af4cc3f | 72 | #define INSTANCE_BUCKETS 16 |
e8179610 G |
73 | struct nfnl_queue_net { |
74 | spinlock_t instances_lock; | |
75 | struct hlist_head instance_table[INSTANCE_BUCKETS]; | |
76 | }; | |
77 | ||
78 | static struct nfnl_queue_net *nfnl_queue_pernet(struct net *net) | |
79 | { | |
80 | return net_generic(net, nfnl_queue_net_id); | |
81 | } | |
7af4cc3f HW |
82 | |
83 | static inline u_int8_t instance_hashfn(u_int16_t queue_num) | |
84 | { | |
1cdb0905 | 85 | return ((queue_num >> 8) ^ queue_num) % INSTANCE_BUCKETS; |
7af4cc3f HW |
86 | } |
87 | ||
88 | static struct nfqnl_instance * | |
e8179610 | 89 | instance_lookup(struct nfnl_queue_net *q, u_int16_t queue_num) |
7af4cc3f HW |
90 | { |
91 | struct hlist_head *head; | |
7af4cc3f HW |
92 | struct nfqnl_instance *inst; |
93 | ||
e8179610 | 94 | head = &q->instance_table[instance_hashfn(queue_num)]; |
b67bfe0d | 95 | hlist_for_each_entry_rcu(inst, head, hlist) { |
7af4cc3f HW |
96 | if (inst->queue_num == queue_num) |
97 | return inst; | |
98 | } | |
99 | return NULL; | |
100 | } | |
101 | ||
7af4cc3f | 102 | static struct nfqnl_instance * |
e8179610 G |
103 | instance_create(struct nfnl_queue_net *q, u_int16_t queue_num, |
104 | int portid) | |
7af4cc3f | 105 | { |
baab2ce7 | 106 | struct nfqnl_instance *inst; |
9872bec7 | 107 | unsigned int h; |
baab2ce7 | 108 | int err; |
7af4cc3f | 109 | |
e8179610 G |
110 | spin_lock(&q->instances_lock); |
111 | if (instance_lookup(q, queue_num)) { | |
baab2ce7 | 112 | err = -EEXIST; |
7af4cc3f | 113 | goto out_unlock; |
baab2ce7 | 114 | } |
7af4cc3f | 115 | |
10dfdc69 | 116 | inst = kzalloc(sizeof(*inst), GFP_ATOMIC); |
baab2ce7 PM |
117 | if (!inst) { |
118 | err = -ENOMEM; | |
7af4cc3f | 119 | goto out_unlock; |
baab2ce7 | 120 | } |
7af4cc3f | 121 | |
7af4cc3f | 122 | inst->queue_num = queue_num; |
15e47304 | 123 | inst->peer_portid = portid; |
7af4cc3f | 124 | inst->queue_maxlen = NFQNL_QMAX_DEFAULT; |
bae99f7a | 125 | inst->copy_range = 0xffff; |
7af4cc3f | 126 | inst->copy_mode = NFQNL_COPY_NONE; |
181a46a5 | 127 | spin_lock_init(&inst->lock); |
7af4cc3f HW |
128 | INIT_LIST_HEAD(&inst->queue_list); |
129 | ||
baab2ce7 PM |
130 | if (!try_module_get(THIS_MODULE)) { |
131 | err = -EAGAIN; | |
7af4cc3f | 132 | goto out_free; |
baab2ce7 | 133 | } |
7af4cc3f | 134 | |
9872bec7 | 135 | h = instance_hashfn(queue_num); |
e8179610 | 136 | hlist_add_head_rcu(&inst->hlist, &q->instance_table[h]); |
7af4cc3f | 137 | |
e8179610 | 138 | spin_unlock(&q->instances_lock); |
7af4cc3f | 139 | |
7af4cc3f HW |
140 | return inst; |
141 | ||
142 | out_free: | |
143 | kfree(inst); | |
144 | out_unlock: | |
e8179610 | 145 | spin_unlock(&q->instances_lock); |
baab2ce7 | 146 | return ERR_PTR(err); |
7af4cc3f HW |
147 | } |
148 | ||
b43d8d85 PM |
149 | static void nfqnl_flush(struct nfqnl_instance *queue, nfqnl_cmpfn cmpfn, |
150 | unsigned long data); | |
7af4cc3f HW |
151 | |
152 | static void | |
9872bec7 | 153 | instance_destroy_rcu(struct rcu_head *head) |
7af4cc3f | 154 | { |
9872bec7 PM |
155 | struct nfqnl_instance *inst = container_of(head, struct nfqnl_instance, |
156 | rcu); | |
7af4cc3f | 157 | |
b43d8d85 | 158 | nfqnl_flush(inst, NULL, 0); |
9872bec7 | 159 | kfree(inst); |
7af4cc3f HW |
160 | module_put(THIS_MODULE); |
161 | } | |
162 | ||
9872bec7 | 163 | static void |
7af4cc3f HW |
164 | __instance_destroy(struct nfqnl_instance *inst) |
165 | { | |
9872bec7 PM |
166 | hlist_del_rcu(&inst->hlist); |
167 | call_rcu(&inst->rcu, instance_destroy_rcu); | |
7af4cc3f HW |
168 | } |
169 | ||
9872bec7 | 170 | static void |
e8179610 | 171 | instance_destroy(struct nfnl_queue_net *q, struct nfqnl_instance *inst) |
7af4cc3f | 172 | { |
e8179610 | 173 | spin_lock(&q->instances_lock); |
9872bec7 | 174 | __instance_destroy(inst); |
e8179610 | 175 | spin_unlock(&q->instances_lock); |
7af4cc3f HW |
176 | } |
177 | ||
7af4cc3f | 178 | static inline void |
02f014d8 | 179 | __enqueue_entry(struct nfqnl_instance *queue, struct nf_queue_entry *entry) |
7af4cc3f | 180 | { |
0ac41e81 | 181 | list_add_tail(&entry->list, &queue->queue_list); |
7af4cc3f HW |
182 | queue->queue_total++; |
183 | } | |
184 | ||
97d32cf9 FW |
185 | static void |
186 | __dequeue_entry(struct nfqnl_instance *queue, struct nf_queue_entry *entry) | |
187 | { | |
188 | list_del(&entry->list); | |
189 | queue->queue_total--; | |
190 | } | |
191 | ||
02f014d8 | 192 | static struct nf_queue_entry * |
b43d8d85 | 193 | find_dequeue_entry(struct nfqnl_instance *queue, unsigned int id) |
7af4cc3f | 194 | { |
02f014d8 | 195 | struct nf_queue_entry *entry = NULL, *i; |
601e68e1 | 196 | |
7af4cc3f | 197 | spin_lock_bh(&queue->lock); |
b43d8d85 PM |
198 | |
199 | list_for_each_entry(i, &queue->queue_list, list) { | |
200 | if (i->id == id) { | |
201 | entry = i; | |
202 | break; | |
203 | } | |
204 | } | |
205 | ||
97d32cf9 FW |
206 | if (entry) |
207 | __dequeue_entry(queue, entry); | |
b43d8d85 | 208 | |
7af4cc3f HW |
209 | spin_unlock_bh(&queue->lock); |
210 | ||
211 | return entry; | |
212 | } | |
213 | ||
214 | static void | |
b43d8d85 | 215 | nfqnl_flush(struct nfqnl_instance *queue, nfqnl_cmpfn cmpfn, unsigned long data) |
7af4cc3f | 216 | { |
02f014d8 | 217 | struct nf_queue_entry *entry, *next; |
b43d8d85 | 218 | |
7af4cc3f | 219 | spin_lock_bh(&queue->lock); |
b43d8d85 PM |
220 | list_for_each_entry_safe(entry, next, &queue->queue_list, list) { |
221 | if (!cmpfn || cmpfn(entry, data)) { | |
222 | list_del(&entry->list); | |
223 | queue->queue_total--; | |
4b3d15ef | 224 | nf_reinject(entry, NF_DROP); |
b43d8d85 PM |
225 | } |
226 | } | |
7af4cc3f HW |
227 | spin_unlock_bh(&queue->lock); |
228 | } | |
229 | ||
ae08ce00 ED |
230 | static void |
231 | nfqnl_zcopy(struct sk_buff *to, const struct sk_buff *from, int len, int hlen) | |
232 | { | |
233 | int i, j = 0; | |
234 | int plen = 0; /* length of skb->head fragment */ | |
235 | struct page *page; | |
236 | unsigned int offset; | |
237 | ||
238 | /* dont bother with small payloads */ | |
239 | if (len <= skb_tailroom(to)) { | |
240 | skb_copy_bits(from, 0, skb_put(to, len), len); | |
241 | return; | |
242 | } | |
243 | ||
244 | if (hlen) { | |
245 | skb_copy_bits(from, 0, skb_put(to, hlen), hlen); | |
246 | len -= hlen; | |
247 | } else { | |
248 | plen = min_t(int, skb_headlen(from), len); | |
249 | if (plen) { | |
250 | page = virt_to_head_page(from->head); | |
251 | offset = from->data - (unsigned char *)page_address(page); | |
252 | __skb_fill_page_desc(to, 0, page, offset, plen); | |
253 | get_page(page); | |
254 | j = 1; | |
255 | len -= plen; | |
256 | } | |
257 | } | |
258 | ||
259 | to->truesize += len + plen; | |
260 | to->len += len + plen; | |
261 | to->data_len += len + plen; | |
262 | ||
263 | for (i = 0; i < skb_shinfo(from)->nr_frags; i++) { | |
264 | if (!len) | |
265 | break; | |
266 | skb_shinfo(to)->frags[j] = skb_shinfo(from)->frags[i]; | |
267 | skb_shinfo(to)->frags[j].size = min_t(int, skb_shinfo(to)->frags[j].size, len); | |
268 | len -= skb_shinfo(to)->frags[j].size; | |
269 | skb_frag_ref(to, j); | |
270 | j++; | |
271 | } | |
272 | skb_shinfo(to)->nr_frags = j; | |
273 | } | |
274 | ||
7af4cc3f HW |
275 | static struct sk_buff * |
276 | nfqnl_build_packet_message(struct nfqnl_instance *queue, | |
5863702a ED |
277 | struct nf_queue_entry *entry, |
278 | __be32 **packet_id_ptr) | |
7af4cc3f | 279 | { |
7af4cc3f | 280 | size_t size; |
6ee584be | 281 | size_t data_len = 0, cap_len = 0; |
ae08ce00 | 282 | int hlen = 0; |
7af4cc3f | 283 | struct sk_buff *skb; |
5863702a ED |
284 | struct nlattr *nla; |
285 | struct nfqnl_msg_packet_hdr *pmsg; | |
7af4cc3f HW |
286 | struct nlmsghdr *nlh; |
287 | struct nfgenmsg *nfmsg; | |
3e4ead4f JJ |
288 | struct sk_buff *entskb = entry->skb; |
289 | struct net_device *indev; | |
290 | struct net_device *outdev; | |
9cb01766 PNA |
291 | struct nf_conn *ct = NULL; |
292 | enum ip_conntrack_info uninitialized_var(ctinfo); | |
7af4cc3f | 293 | |
573ce260 | 294 | size = nlmsg_total_size(sizeof(struct nfgenmsg)) |
df6fb868 PM |
295 | + nla_total_size(sizeof(struct nfqnl_msg_packet_hdr)) |
296 | + nla_total_size(sizeof(u_int32_t)) /* ifindex */ | |
297 | + nla_total_size(sizeof(u_int32_t)) /* ifindex */ | |
fbcd923c | 298 | #ifdef CONFIG_BRIDGE_NETFILTER |
df6fb868 PM |
299 | + nla_total_size(sizeof(u_int32_t)) /* ifindex */ |
300 | + nla_total_size(sizeof(u_int32_t)) /* ifindex */ | |
fbcd923c | 301 | #endif |
df6fb868 PM |
302 | + nla_total_size(sizeof(u_int32_t)) /* mark */ |
303 | + nla_total_size(sizeof(struct nfqnl_msg_packet_hw)) | |
ae08ce00 ED |
304 | + nla_total_size(sizeof(u_int32_t)); /* cap_len */ |
305 | ||
306 | if (entskb->tstamp.tv64) | |
307 | size += nla_total_size(sizeof(struct nfqnl_msg_packet_timestamp)); | |
7af4cc3f | 308 | |
02f014d8 | 309 | outdev = entry->outdev; |
3e4ead4f | 310 | |
c463ac97 | 311 | switch ((enum nfqnl_config_mode)ACCESS_ONCE(queue->copy_mode)) { |
7af4cc3f HW |
312 | case NFQNL_COPY_META: |
313 | case NFQNL_COPY_NONE: | |
7af4cc3f | 314 | break; |
601e68e1 | 315 | |
7af4cc3f | 316 | case NFQNL_COPY_PACKET: |
e9f13cab | 317 | if (entskb->ip_summed == CHECKSUM_PARTIAL && |
c463ac97 | 318 | skb_checksum_help(entskb)) |
e7dfb09a | 319 | return NULL; |
c463ac97 ED |
320 | |
321 | data_len = ACCESS_ONCE(queue->copy_range); | |
322 | if (data_len == 0 || data_len > entskb->len) | |
3e4ead4f | 323 | data_len = entskb->len; |
601e68e1 | 324 | |
ae08ce00 ED |
325 | |
326 | if (!entskb->head_frag || | |
327 | skb_headlen(entskb) < L1_CACHE_BYTES || | |
328 | skb_shinfo(entskb)->nr_frags >= MAX_SKB_FRAGS) | |
329 | hlen = skb_headlen(entskb); | |
330 | ||
331 | if (skb_has_frag_list(entskb)) | |
332 | hlen = entskb->len; | |
333 | hlen = min_t(int, data_len, hlen); | |
334 | size += sizeof(struct nlattr) + hlen; | |
6ee584be | 335 | cap_len = entskb->len; |
7af4cc3f | 336 | break; |
7af4cc3f HW |
337 | } |
338 | ||
7c622345 PNA |
339 | if (queue->flags & NFQA_CFG_F_CONNTRACK) |
340 | ct = nfqnl_ct_get(entskb, &size, &ctinfo); | |
7af4cc3f HW |
341 | |
342 | skb = alloc_skb(size, GFP_ATOMIC); | |
343 | if (!skb) | |
3da07c0c | 344 | return NULL; |
601e68e1 | 345 | |
3da07c0c | 346 | nlh = nlmsg_put(skb, 0, 0, |
7af4cc3f | 347 | NFNL_SUBSYS_QUEUE << 8 | NFQNL_MSG_PACKET, |
3da07c0c DM |
348 | sizeof(struct nfgenmsg), 0); |
349 | if (!nlh) { | |
350 | kfree_skb(skb); | |
351 | return NULL; | |
352 | } | |
353 | nfmsg = nlmsg_data(nlh); | |
02f014d8 | 354 | nfmsg->nfgen_family = entry->pf; |
7af4cc3f HW |
355 | nfmsg->version = NFNETLINK_V0; |
356 | nfmsg->res_id = htons(queue->queue_num); | |
357 | ||
5863702a ED |
358 | nla = __nla_reserve(skb, NFQA_PACKET_HDR, sizeof(*pmsg)); |
359 | pmsg = nla_data(nla); | |
360 | pmsg->hw_protocol = entskb->protocol; | |
361 | pmsg->hook = entry->hook; | |
362 | *packet_id_ptr = &pmsg->packet_id; | |
7af4cc3f | 363 | |
02f014d8 | 364 | indev = entry->indev; |
3e4ead4f | 365 | if (indev) { |
fbcd923c | 366 | #ifndef CONFIG_BRIDGE_NETFILTER |
a447189e DM |
367 | if (nla_put_be32(skb, NFQA_IFINDEX_INDEV, htonl(indev->ifindex))) |
368 | goto nla_put_failure; | |
fbcd923c | 369 | #else |
02f014d8 | 370 | if (entry->pf == PF_BRIDGE) { |
fbcd923c | 371 | /* Case 1: indev is physical input device, we need to |
601e68e1 | 372 | * look for bridge group (when called from |
fbcd923c | 373 | * netfilter_bridge) */ |
a447189e DM |
374 | if (nla_put_be32(skb, NFQA_IFINDEX_PHYSINDEV, |
375 | htonl(indev->ifindex)) || | |
fbcd923c | 376 | /* this is the bridge group "brX" */ |
f350a0a8 | 377 | /* rcu_read_lock()ed by __nf_queue */ |
a447189e DM |
378 | nla_put_be32(skb, NFQA_IFINDEX_INDEV, |
379 | htonl(br_port_get_rcu(indev)->br->dev->ifindex))) | |
380 | goto nla_put_failure; | |
fbcd923c HW |
381 | } else { |
382 | /* Case 2: indev is bridge group, we need to look for | |
383 | * physical device (when called from ipv4) */ | |
a447189e DM |
384 | if (nla_put_be32(skb, NFQA_IFINDEX_INDEV, |
385 | htonl(indev->ifindex))) | |
386 | goto nla_put_failure; | |
387 | if (entskb->nf_bridge && entskb->nf_bridge->physindev && | |
388 | nla_put_be32(skb, NFQA_IFINDEX_PHYSINDEV, | |
389 | htonl(entskb->nf_bridge->physindev->ifindex))) | |
390 | goto nla_put_failure; | |
fbcd923c HW |
391 | } |
392 | #endif | |
7af4cc3f HW |
393 | } |
394 | ||
3e4ead4f | 395 | if (outdev) { |
fbcd923c | 396 | #ifndef CONFIG_BRIDGE_NETFILTER |
a447189e DM |
397 | if (nla_put_be32(skb, NFQA_IFINDEX_OUTDEV, htonl(outdev->ifindex))) |
398 | goto nla_put_failure; | |
fbcd923c | 399 | #else |
02f014d8 | 400 | if (entry->pf == PF_BRIDGE) { |
fbcd923c | 401 | /* Case 1: outdev is physical output device, we need to |
601e68e1 | 402 | * look for bridge group (when called from |
fbcd923c | 403 | * netfilter_bridge) */ |
a447189e DM |
404 | if (nla_put_be32(skb, NFQA_IFINDEX_PHYSOUTDEV, |
405 | htonl(outdev->ifindex)) || | |
fbcd923c | 406 | /* this is the bridge group "brX" */ |
f350a0a8 | 407 | /* rcu_read_lock()ed by __nf_queue */ |
a447189e DM |
408 | nla_put_be32(skb, NFQA_IFINDEX_OUTDEV, |
409 | htonl(br_port_get_rcu(outdev)->br->dev->ifindex))) | |
410 | goto nla_put_failure; | |
fbcd923c HW |
411 | } else { |
412 | /* Case 2: outdev is bridge group, we need to look for | |
413 | * physical output device (when called from ipv4) */ | |
a447189e DM |
414 | if (nla_put_be32(skb, NFQA_IFINDEX_OUTDEV, |
415 | htonl(outdev->ifindex))) | |
416 | goto nla_put_failure; | |
417 | if (entskb->nf_bridge && entskb->nf_bridge->physoutdev && | |
418 | nla_put_be32(skb, NFQA_IFINDEX_PHYSOUTDEV, | |
419 | htonl(entskb->nf_bridge->physoutdev->ifindex))) | |
420 | goto nla_put_failure; | |
fbcd923c HW |
421 | } |
422 | #endif | |
7af4cc3f HW |
423 | } |
424 | ||
a447189e DM |
425 | if (entskb->mark && |
426 | nla_put_be32(skb, NFQA_MARK, htonl(entskb->mark))) | |
427 | goto nla_put_failure; | |
7af4cc3f | 428 | |
2c38de4c NC |
429 | if (indev && entskb->dev && |
430 | entskb->mac_header != entskb->network_header) { | |
7af4cc3f | 431 | struct nfqnl_msg_packet_hw phw; |
b95cce35 SH |
432 | int len = dev_parse_header(entskb, phw.hw_addr); |
433 | if (len) { | |
434 | phw.hw_addrlen = htons(len); | |
a447189e DM |
435 | if (nla_put(skb, NFQA_HWADDR, sizeof(phw), &phw)) |
436 | goto nla_put_failure; | |
b95cce35 | 437 | } |
7af4cc3f HW |
438 | } |
439 | ||
b7aa0bf7 | 440 | if (entskb->tstamp.tv64) { |
7af4cc3f | 441 | struct nfqnl_msg_packet_timestamp ts; |
b7aa0bf7 ED |
442 | struct timeval tv = ktime_to_timeval(entskb->tstamp); |
443 | ts.sec = cpu_to_be64(tv.tv_sec); | |
444 | ts.usec = cpu_to_be64(tv.tv_usec); | |
7af4cc3f | 445 | |
a447189e DM |
446 | if (nla_put(skb, NFQA_TIMESTAMP, sizeof(ts), &ts)) |
447 | goto nla_put_failure; | |
7af4cc3f HW |
448 | } |
449 | ||
ae08ce00 ED |
450 | if (ct && nfqnl_ct_put(skb, ct, ctinfo) < 0) |
451 | goto nla_put_failure; | |
452 | ||
453 | if (cap_len > 0 && nla_put_be32(skb, NFQA_CAP_LEN, htonl(cap_len))) | |
454 | goto nla_put_failure; | |
455 | ||
7af4cc3f | 456 | if (data_len) { |
df6fb868 | 457 | struct nlattr *nla; |
7af4cc3f | 458 | |
ae08ce00 ED |
459 | if (skb_tailroom(skb) < sizeof(*nla) + hlen) |
460 | goto nla_put_failure; | |
7af4cc3f | 461 | |
ae08ce00 | 462 | nla = (struct nlattr *)skb_put(skb, sizeof(*nla)); |
df6fb868 | 463 | nla->nla_type = NFQA_PAYLOAD; |
ae08ce00 | 464 | nla->nla_len = nla_attr_size(data_len); |
7af4cc3f | 465 | |
ae08ce00 | 466 | nfqnl_zcopy(skb, entskb, data_len, hlen); |
7af4cc3f | 467 | } |
601e68e1 | 468 | |
ae08ce00 | 469 | nlh->nlmsg_len = skb->len; |
7af4cc3f HW |
470 | return skb; |
471 | ||
df6fb868 | 472 | nla_put_failure: |
a6729955 | 473 | kfree_skb(skb); |
e87cc472 | 474 | net_err_ratelimited("nf_queue: error creating packet message\n"); |
7af4cc3f HW |
475 | return NULL; |
476 | } | |
477 | ||
478 | static int | |
02f014d8 | 479 | nfqnl_enqueue_packet(struct nf_queue_entry *entry, unsigned int queuenum) |
7af4cc3f | 480 | { |
7af4cc3f HW |
481 | struct sk_buff *nskb; |
482 | struct nfqnl_instance *queue; | |
f1585086 | 483 | int err = -ENOBUFS; |
5863702a | 484 | __be32 *packet_id_ptr; |
fdb694a0 | 485 | int failopen = 0; |
e8179610 G |
486 | struct net *net = dev_net(entry->indev ? |
487 | entry->indev : entry->outdev); | |
488 | struct nfnl_queue_net *q = nfnl_queue_pernet(net); | |
7af4cc3f | 489 | |
9872bec7 | 490 | /* rcu_read_lock()ed by nf_hook_slow() */ |
e8179610 | 491 | queue = instance_lookup(q, queuenum); |
f1585086 FW |
492 | if (!queue) { |
493 | err = -ESRCH; | |
0ef0f465 | 494 | goto err_out; |
f1585086 | 495 | } |
7af4cc3f | 496 | |
f1585086 FW |
497 | if (queue->copy_mode == NFQNL_COPY_NONE) { |
498 | err = -EINVAL; | |
0ef0f465 | 499 | goto err_out; |
f1585086 | 500 | } |
7af4cc3f | 501 | |
5863702a | 502 | nskb = nfqnl_build_packet_message(queue, entry, &packet_id_ptr); |
f1585086 FW |
503 | if (nskb == NULL) { |
504 | err = -ENOMEM; | |
0ef0f465 | 505 | goto err_out; |
f1585086 | 506 | } |
7af4cc3f | 507 | spin_lock_bh(&queue->lock); |
601e68e1 | 508 | |
15e47304 | 509 | if (!queue->peer_portid) { |
f1585086 | 510 | err = -EINVAL; |
601e68e1 | 511 | goto err_out_free_nskb; |
f1585086 | 512 | } |
7af4cc3f | 513 | if (queue->queue_total >= queue->queue_maxlen) { |
fdb694a0 KK |
514 | if (queue->flags & NFQA_CFG_F_FAIL_OPEN) { |
515 | failopen = 1; | |
516 | err = 0; | |
517 | } else { | |
518 | queue->queue_dropped++; | |
519 | net_warn_ratelimited("nf_queue: full at %d entries, dropping packets(s)\n", | |
520 | queue->queue_total); | |
521 | } | |
7af4cc3f HW |
522 | goto err_out_free_nskb; |
523 | } | |
5863702a ED |
524 | entry->id = ++queue->id_sequence; |
525 | *packet_id_ptr = htonl(entry->id); | |
7af4cc3f HW |
526 | |
527 | /* nfnetlink_unicast will either free the nskb or add it to a socket */ | |
e8179610 | 528 | err = nfnetlink_unicast(nskb, net, queue->peer_portid, MSG_DONTWAIT); |
0ef0f465 | 529 | if (err < 0) { |
601e68e1 | 530 | queue->queue_user_dropped++; |
7af4cc3f HW |
531 | goto err_out_unlock; |
532 | } | |
533 | ||
534 | __enqueue_entry(queue, entry); | |
535 | ||
536 | spin_unlock_bh(&queue->lock); | |
0ef0f465 | 537 | return 0; |
7af4cc3f HW |
538 | |
539 | err_out_free_nskb: | |
601e68e1 | 540 | kfree_skb(nskb); |
7af4cc3f HW |
541 | err_out_unlock: |
542 | spin_unlock_bh(&queue->lock); | |
fdb694a0 KK |
543 | if (failopen) |
544 | nf_reinject(entry, NF_ACCEPT); | |
0ef0f465 | 545 | err_out: |
f1585086 | 546 | return err; |
7af4cc3f HW |
547 | } |
548 | ||
549 | static int | |
8c88f87c | 550 | nfqnl_mangle(void *data, int data_len, struct nf_queue_entry *e, int diff) |
7af4cc3f | 551 | { |
e2b58a67 | 552 | struct sk_buff *nskb; |
7af4cc3f | 553 | |
d8a585d7 PM |
554 | if (diff < 0) { |
555 | if (pskb_trim(e->skb, data_len)) | |
556 | return -ENOMEM; | |
557 | } else if (diff > 0) { | |
7af4cc3f HW |
558 | if (data_len > 0xFFFF) |
559 | return -EINVAL; | |
560 | if (diff > skb_tailroom(e->skb)) { | |
9a732ed6 AE |
561 | nskb = skb_copy_expand(e->skb, skb_headroom(e->skb), |
562 | diff, GFP_ATOMIC); | |
e2b58a67 | 563 | if (!nskb) { |
1158ba27 | 564 | printk(KERN_WARNING "nf_queue: OOM " |
7af4cc3f | 565 | "in mangle, dropping packet\n"); |
e2b58a67 | 566 | return -ENOMEM; |
7af4cc3f | 567 | } |
e2b58a67 PM |
568 | kfree_skb(e->skb); |
569 | e->skb = nskb; | |
7af4cc3f HW |
570 | } |
571 | skb_put(e->skb, diff); | |
572 | } | |
37d41879 | 573 | if (!skb_make_writable(e->skb, data_len)) |
7af4cc3f | 574 | return -ENOMEM; |
27d7ff46 | 575 | skb_copy_to_linear_data(e->skb, data, data_len); |
e7dfb09a | 576 | e->skb->ip_summed = CHECKSUM_NONE; |
7af4cc3f HW |
577 | return 0; |
578 | } | |
579 | ||
7af4cc3f HW |
580 | static int |
581 | nfqnl_set_mode(struct nfqnl_instance *queue, | |
582 | unsigned char mode, unsigned int range) | |
583 | { | |
c5de0dfd | 584 | int status = 0; |
7af4cc3f HW |
585 | |
586 | spin_lock_bh(&queue->lock); | |
c5de0dfd PM |
587 | switch (mode) { |
588 | case NFQNL_COPY_NONE: | |
589 | case NFQNL_COPY_META: | |
590 | queue->copy_mode = mode; | |
591 | queue->copy_range = 0; | |
592 | break; | |
593 | ||
594 | case NFQNL_COPY_PACKET: | |
595 | queue->copy_mode = mode; | |
ba8d3b0b PNA |
596 | /* We're using struct nlattr which has 16bit nla_len. Note that |
597 | * nla_len includes the header length. Thus, the maximum packet | |
598 | * length that we support is 65531 bytes. We send truncated | |
599 | * packets if the specified length is larger than that. | |
600 | */ | |
601 | if (range > 0xffff - NLA_HDRLEN) | |
602 | queue->copy_range = 0xffff - NLA_HDRLEN; | |
c5de0dfd PM |
603 | else |
604 | queue->copy_range = range; | |
605 | break; | |
606 | ||
607 | default: | |
608 | status = -EINVAL; | |
609 | ||
610 | } | |
7af4cc3f HW |
611 | spin_unlock_bh(&queue->lock); |
612 | ||
613 | return status; | |
614 | } | |
615 | ||
616 | static int | |
02f014d8 | 617 | dev_cmp(struct nf_queue_entry *entry, unsigned long ifindex) |
7af4cc3f | 618 | { |
02f014d8 PM |
619 | if (entry->indev) |
620 | if (entry->indev->ifindex == ifindex) | |
7af4cc3f | 621 | return 1; |
02f014d8 PM |
622 | if (entry->outdev) |
623 | if (entry->outdev->ifindex == ifindex) | |
7af4cc3f | 624 | return 1; |
ef47c6a7 PM |
625 | #ifdef CONFIG_BRIDGE_NETFILTER |
626 | if (entry->skb->nf_bridge) { | |
627 | if (entry->skb->nf_bridge->physindev && | |
628 | entry->skb->nf_bridge->physindev->ifindex == ifindex) | |
629 | return 1; | |
630 | if (entry->skb->nf_bridge->physoutdev && | |
631 | entry->skb->nf_bridge->physoutdev->ifindex == ifindex) | |
632 | return 1; | |
633 | } | |
634 | #endif | |
7af4cc3f HW |
635 | return 0; |
636 | } | |
637 | ||
638 | /* drop all packets with either indev or outdev == ifindex from all queue | |
639 | * instances */ | |
640 | static void | |
e8179610 | 641 | nfqnl_dev_drop(struct net *net, int ifindex) |
7af4cc3f HW |
642 | { |
643 | int i; | |
e8179610 | 644 | struct nfnl_queue_net *q = nfnl_queue_pernet(net); |
601e68e1 | 645 | |
9872bec7 | 646 | rcu_read_lock(); |
7af4cc3f | 647 | |
9872bec7 | 648 | for (i = 0; i < INSTANCE_BUCKETS; i++) { |
7af4cc3f | 649 | struct nfqnl_instance *inst; |
e8179610 | 650 | struct hlist_head *head = &q->instance_table[i]; |
7af4cc3f | 651 | |
b67bfe0d | 652 | hlist_for_each_entry_rcu(inst, head, hlist) |
b43d8d85 | 653 | nfqnl_flush(inst, dev_cmp, ifindex); |
7af4cc3f HW |
654 | } |
655 | ||
9872bec7 | 656 | rcu_read_unlock(); |
7af4cc3f HW |
657 | } |
658 | ||
659 | #define RCV_SKB_FAIL(err) do { netlink_ack(skb, nlh, (err)); return; } while (0) | |
660 | ||
661 | static int | |
662 | nfqnl_rcv_dev_event(struct notifier_block *this, | |
663 | unsigned long event, void *ptr) | |
664 | { | |
665 | struct net_device *dev = ptr; | |
666 | ||
667 | /* Drop any packets associated with the downed device */ | |
668 | if (event == NETDEV_DOWN) | |
e8179610 | 669 | nfqnl_dev_drop(dev_net(dev), dev->ifindex); |
7af4cc3f HW |
670 | return NOTIFY_DONE; |
671 | } | |
672 | ||
673 | static struct notifier_block nfqnl_dev_notifier = { | |
674 | .notifier_call = nfqnl_rcv_dev_event, | |
675 | }; | |
676 | ||
677 | static int | |
678 | nfqnl_rcv_nl_event(struct notifier_block *this, | |
679 | unsigned long event, void *ptr) | |
680 | { | |
681 | struct netlink_notify *n = ptr; | |
e8179610 | 682 | struct nfnl_queue_net *q = nfnl_queue_pernet(n->net); |
7af4cc3f | 683 | |
dee5817e | 684 | if (event == NETLINK_URELEASE && n->protocol == NETLINK_NETFILTER) { |
7af4cc3f HW |
685 | int i; |
686 | ||
15e47304 | 687 | /* destroy all instances for this portid */ |
e8179610 | 688 | spin_lock(&q->instances_lock); |
9872bec7 | 689 | for (i = 0; i < INSTANCE_BUCKETS; i++) { |
b67bfe0d | 690 | struct hlist_node *t2; |
7af4cc3f | 691 | struct nfqnl_instance *inst; |
e8179610 | 692 | struct hlist_head *head = &q->instance_table[i]; |
7af4cc3f | 693 | |
b67bfe0d | 694 | hlist_for_each_entry_safe(inst, t2, head, hlist) { |
e8179610 | 695 | if (n->portid == inst->peer_portid) |
7af4cc3f HW |
696 | __instance_destroy(inst); |
697 | } | |
698 | } | |
e8179610 | 699 | spin_unlock(&q->instances_lock); |
7af4cc3f HW |
700 | } |
701 | return NOTIFY_DONE; | |
702 | } | |
703 | ||
704 | static struct notifier_block nfqnl_rtnl_notifier = { | |
705 | .notifier_call = nfqnl_rcv_nl_event, | |
706 | }; | |
707 | ||
5bf75853 PM |
708 | static const struct nla_policy nfqa_verdict_policy[NFQA_MAX+1] = { |
709 | [NFQA_VERDICT_HDR] = { .len = sizeof(struct nfqnl_msg_verdict_hdr) }, | |
710 | [NFQA_MARK] = { .type = NLA_U32 }, | |
711 | [NFQA_PAYLOAD] = { .type = NLA_UNSPEC }, | |
9cb01766 | 712 | [NFQA_CT] = { .type = NLA_UNSPEC }, |
838ab636 HW |
713 | }; |
714 | ||
97d32cf9 FW |
715 | static const struct nla_policy nfqa_verdict_batch_policy[NFQA_MAX+1] = { |
716 | [NFQA_VERDICT_HDR] = { .len = sizeof(struct nfqnl_msg_verdict_hdr) }, | |
717 | [NFQA_MARK] = { .type = NLA_U32 }, | |
718 | }; | |
719 | ||
e8179610 G |
720 | static struct nfqnl_instance * |
721 | verdict_instance_lookup(struct nfnl_queue_net *q, u16 queue_num, int nlportid) | |
97d32cf9 FW |
722 | { |
723 | struct nfqnl_instance *queue; | |
724 | ||
e8179610 | 725 | queue = instance_lookup(q, queue_num); |
97d32cf9 FW |
726 | if (!queue) |
727 | return ERR_PTR(-ENODEV); | |
728 | ||
15e47304 | 729 | if (queue->peer_portid != nlportid) |
97d32cf9 FW |
730 | return ERR_PTR(-EPERM); |
731 | ||
732 | return queue; | |
733 | } | |
734 | ||
735 | static struct nfqnl_msg_verdict_hdr* | |
736 | verdicthdr_get(const struct nlattr * const nfqa[]) | |
737 | { | |
738 | struct nfqnl_msg_verdict_hdr *vhdr; | |
739 | unsigned int verdict; | |
740 | ||
741 | if (!nfqa[NFQA_VERDICT_HDR]) | |
742 | return NULL; | |
743 | ||
744 | vhdr = nla_data(nfqa[NFQA_VERDICT_HDR]); | |
c6675233 FW |
745 | verdict = ntohl(vhdr->verdict) & NF_VERDICT_MASK; |
746 | if (verdict > NF_MAX_VERDICT || verdict == NF_STOLEN) | |
97d32cf9 FW |
747 | return NULL; |
748 | return vhdr; | |
749 | } | |
750 | ||
751 | static int nfq_id_after(unsigned int id, unsigned int max) | |
752 | { | |
753 | return (int)(id - max) > 0; | |
754 | } | |
755 | ||
756 | static int | |
757 | nfqnl_recv_verdict_batch(struct sock *ctnl, struct sk_buff *skb, | |
758 | const struct nlmsghdr *nlh, | |
759 | const struct nlattr * const nfqa[]) | |
760 | { | |
3da07c0c | 761 | struct nfgenmsg *nfmsg = nlmsg_data(nlh); |
97d32cf9 FW |
762 | struct nf_queue_entry *entry, *tmp; |
763 | unsigned int verdict, maxid; | |
764 | struct nfqnl_msg_verdict_hdr *vhdr; | |
765 | struct nfqnl_instance *queue; | |
766 | LIST_HEAD(batch_list); | |
767 | u16 queue_num = ntohs(nfmsg->res_id); | |
768 | ||
e8179610 G |
769 | struct net *net = sock_net(ctnl); |
770 | struct nfnl_queue_net *q = nfnl_queue_pernet(net); | |
771 | ||
772 | queue = verdict_instance_lookup(q, queue_num, | |
773 | NETLINK_CB(skb).portid); | |
97d32cf9 FW |
774 | if (IS_ERR(queue)) |
775 | return PTR_ERR(queue); | |
776 | ||
777 | vhdr = verdicthdr_get(nfqa); | |
778 | if (!vhdr) | |
779 | return -EINVAL; | |
780 | ||
781 | verdict = ntohl(vhdr->verdict); | |
782 | maxid = ntohl(vhdr->id); | |
783 | ||
784 | spin_lock_bh(&queue->lock); | |
785 | ||
786 | list_for_each_entry_safe(entry, tmp, &queue->queue_list, list) { | |
787 | if (nfq_id_after(entry->id, maxid)) | |
788 | break; | |
789 | __dequeue_entry(queue, entry); | |
790 | list_add_tail(&entry->list, &batch_list); | |
791 | } | |
792 | ||
793 | spin_unlock_bh(&queue->lock); | |
794 | ||
795 | if (list_empty(&batch_list)) | |
796 | return -ENOENT; | |
797 | ||
798 | list_for_each_entry_safe(entry, tmp, &batch_list, list) { | |
799 | if (nfqa[NFQA_MARK]) | |
800 | entry->skb->mark = ntohl(nla_get_be32(nfqa[NFQA_MARK])); | |
801 | nf_reinject(entry, verdict); | |
802 | } | |
803 | return 0; | |
804 | } | |
805 | ||
7af4cc3f HW |
806 | static int |
807 | nfqnl_recv_verdict(struct sock *ctnl, struct sk_buff *skb, | |
39938324 PM |
808 | const struct nlmsghdr *nlh, |
809 | const struct nlattr * const nfqa[]) | |
7af4cc3f | 810 | { |
3da07c0c | 811 | struct nfgenmsg *nfmsg = nlmsg_data(nlh); |
7af4cc3f HW |
812 | u_int16_t queue_num = ntohs(nfmsg->res_id); |
813 | ||
814 | struct nfqnl_msg_verdict_hdr *vhdr; | |
815 | struct nfqnl_instance *queue; | |
816 | unsigned int verdict; | |
02f014d8 | 817 | struct nf_queue_entry *entry; |
8c88f87c PNA |
818 | enum ip_conntrack_info uninitialized_var(ctinfo); |
819 | struct nf_conn *ct = NULL; | |
7af4cc3f | 820 | |
e8179610 G |
821 | struct net *net = sock_net(ctnl); |
822 | struct nfnl_queue_net *q = nfnl_queue_pernet(net); | |
7af4cc3f | 823 | |
e8179610 G |
824 | queue = instance_lookup(q, queue_num); |
825 | if (!queue) | |
826 | queue = verdict_instance_lookup(q, queue_num, | |
827 | NETLINK_CB(skb).portid); | |
97d32cf9 FW |
828 | if (IS_ERR(queue)) |
829 | return PTR_ERR(queue); | |
7af4cc3f | 830 | |
97d32cf9 FW |
831 | vhdr = verdicthdr_get(nfqa); |
832 | if (!vhdr) | |
84a797dd | 833 | return -EINVAL; |
7af4cc3f | 834 | |
7af4cc3f HW |
835 | verdict = ntohl(vhdr->verdict); |
836 | ||
b43d8d85 | 837 | entry = find_dequeue_entry(queue, ntohl(vhdr->id)); |
84a797dd ED |
838 | if (entry == NULL) |
839 | return -ENOENT; | |
7af4cc3f | 840 | |
9cb01766 | 841 | rcu_read_lock(); |
7c622345 PNA |
842 | if (nfqa[NFQA_CT] && (queue->flags & NFQA_CFG_F_CONNTRACK)) |
843 | ct = nfqnl_ct_parse(entry->skb, nfqa[NFQA_CT], &ctinfo); | |
9cb01766 | 844 | |
df6fb868 | 845 | if (nfqa[NFQA_PAYLOAD]) { |
8c88f87c PNA |
846 | u16 payload_len = nla_len(nfqa[NFQA_PAYLOAD]); |
847 | int diff = payload_len - entry->skb->len; | |
848 | ||
df6fb868 | 849 | if (nfqnl_mangle(nla_data(nfqa[NFQA_PAYLOAD]), |
8c88f87c | 850 | payload_len, entry, diff) < 0) |
7af4cc3f | 851 | verdict = NF_DROP; |
8c88f87c | 852 | |
7c622345 PNA |
853 | if (ct) |
854 | nfqnl_ct_seq_adjust(skb, ct, ctinfo, diff); | |
7af4cc3f | 855 | } |
8c88f87c | 856 | rcu_read_unlock(); |
7af4cc3f | 857 | |
df6fb868 | 858 | if (nfqa[NFQA_MARK]) |
ea3a66ff | 859 | entry->skb->mark = ntohl(nla_get_be32(nfqa[NFQA_MARK])); |
601e68e1 | 860 | |
4b3d15ef | 861 | nf_reinject(entry, verdict); |
7af4cc3f HW |
862 | return 0; |
863 | } | |
864 | ||
865 | static int | |
866 | nfqnl_recv_unsupp(struct sock *ctnl, struct sk_buff *skb, | |
39938324 PM |
867 | const struct nlmsghdr *nlh, |
868 | const struct nlattr * const nfqa[]) | |
7af4cc3f HW |
869 | { |
870 | return -ENOTSUPP; | |
871 | } | |
872 | ||
5bf75853 PM |
873 | static const struct nla_policy nfqa_cfg_policy[NFQA_CFG_MAX+1] = { |
874 | [NFQA_CFG_CMD] = { .len = sizeof(struct nfqnl_msg_config_cmd) }, | |
875 | [NFQA_CFG_PARAMS] = { .len = sizeof(struct nfqnl_msg_config_params) }, | |
838ab636 HW |
876 | }; |
877 | ||
e3ac5298 | 878 | static const struct nf_queue_handler nfqh = { |
bbd86b9f HW |
879 | .outfn = &nfqnl_enqueue_packet, |
880 | }; | |
881 | ||
7af4cc3f HW |
882 | static int |
883 | nfqnl_recv_config(struct sock *ctnl, struct sk_buff *skb, | |
39938324 PM |
884 | const struct nlmsghdr *nlh, |
885 | const struct nlattr * const nfqa[]) | |
7af4cc3f | 886 | { |
3da07c0c | 887 | struct nfgenmsg *nfmsg = nlmsg_data(nlh); |
7af4cc3f HW |
888 | u_int16_t queue_num = ntohs(nfmsg->res_id); |
889 | struct nfqnl_instance *queue; | |
9872bec7 | 890 | struct nfqnl_msg_config_cmd *cmd = NULL; |
e8179610 G |
891 | struct net *net = sock_net(ctnl); |
892 | struct nfnl_queue_net *q = nfnl_queue_pernet(net); | |
838ab636 | 893 | int ret = 0; |
7af4cc3f | 894 | |
9872bec7 PM |
895 | if (nfqa[NFQA_CFG_CMD]) { |
896 | cmd = nla_data(nfqa[NFQA_CFG_CMD]); | |
897 | ||
0360ae41 | 898 | /* Obsolete commands without queue context */ |
9872bec7 | 899 | switch (cmd->command) { |
0360ae41 FW |
900 | case NFQNL_CFG_CMD_PF_BIND: return 0; |
901 | case NFQNL_CFG_CMD_PF_UNBIND: return 0; | |
9872bec7 | 902 | } |
9872bec7 PM |
903 | } |
904 | ||
905 | rcu_read_lock(); | |
e8179610 | 906 | queue = instance_lookup(q, queue_num); |
15e47304 | 907 | if (queue && queue->peer_portid != NETLINK_CB(skb).portid) { |
a3c8e7fd | 908 | ret = -EPERM; |
9872bec7 | 909 | goto err_out_unlock; |
a3c8e7fd PM |
910 | } |
911 | ||
9872bec7 | 912 | if (cmd != NULL) { |
7af4cc3f HW |
913 | switch (cmd->command) { |
914 | case NFQNL_CFG_CMD_BIND: | |
9872bec7 PM |
915 | if (queue) { |
916 | ret = -EBUSY; | |
917 | goto err_out_unlock; | |
918 | } | |
e8179610 G |
919 | queue = instance_create(q, queue_num, |
920 | NETLINK_CB(skb).portid); | |
baab2ce7 PM |
921 | if (IS_ERR(queue)) { |
922 | ret = PTR_ERR(queue); | |
9872bec7 PM |
923 | goto err_out_unlock; |
924 | } | |
7af4cc3f HW |
925 | break; |
926 | case NFQNL_CFG_CMD_UNBIND: | |
9872bec7 PM |
927 | if (!queue) { |
928 | ret = -ENODEV; | |
929 | goto err_out_unlock; | |
930 | } | |
e8179610 | 931 | instance_destroy(q, queue); |
7af4cc3f HW |
932 | break; |
933 | case NFQNL_CFG_CMD_PF_BIND: | |
7af4cc3f | 934 | case NFQNL_CFG_CMD_PF_UNBIND: |
7af4cc3f HW |
935 | break; |
936 | default: | |
cd21f0ac | 937 | ret = -ENOTSUPP; |
838ab636 | 938 | break; |
7af4cc3f | 939 | } |
7af4cc3f HW |
940 | } |
941 | ||
df6fb868 | 942 | if (nfqa[NFQA_CFG_PARAMS]) { |
7af4cc3f | 943 | struct nfqnl_msg_config_params *params; |
7af4cc3f | 944 | |
406dbfc9 | 945 | if (!queue) { |
a3c8e7fd | 946 | ret = -ENODEV; |
9872bec7 | 947 | goto err_out_unlock; |
406dbfc9 | 948 | } |
df6fb868 | 949 | params = nla_data(nfqa[NFQA_CFG_PARAMS]); |
7af4cc3f HW |
950 | nfqnl_set_mode(queue, params->copy_mode, |
951 | ntohl(params->copy_range)); | |
952 | } | |
953 | ||
df6fb868 | 954 | if (nfqa[NFQA_CFG_QUEUE_MAXLEN]) { |
829e17a1 | 955 | __be32 *queue_maxlen; |
a3c8e7fd PM |
956 | |
957 | if (!queue) { | |
958 | ret = -ENODEV; | |
9872bec7 | 959 | goto err_out_unlock; |
a3c8e7fd | 960 | } |
df6fb868 | 961 | queue_maxlen = nla_data(nfqa[NFQA_CFG_QUEUE_MAXLEN]); |
829e17a1 EL |
962 | spin_lock_bh(&queue->lock); |
963 | queue->queue_maxlen = ntohl(*queue_maxlen); | |
964 | spin_unlock_bh(&queue->lock); | |
965 | } | |
966 | ||
fdb694a0 KK |
967 | if (nfqa[NFQA_CFG_FLAGS]) { |
968 | __u32 flags, mask; | |
969 | ||
970 | if (!queue) { | |
971 | ret = -ENODEV; | |
972 | goto err_out_unlock; | |
973 | } | |
974 | ||
975 | if (!nfqa[NFQA_CFG_MASK]) { | |
976 | /* A mask is needed to specify which flags are being | |
977 | * changed. | |
978 | */ | |
979 | ret = -EINVAL; | |
980 | goto err_out_unlock; | |
981 | } | |
982 | ||
983 | flags = ntohl(nla_get_be32(nfqa[NFQA_CFG_FLAGS])); | |
984 | mask = ntohl(nla_get_be32(nfqa[NFQA_CFG_MASK])); | |
985 | ||
46ba5a25 KK |
986 | if (flags >= NFQA_CFG_F_MAX) { |
987 | ret = -EOPNOTSUPP; | |
988 | goto err_out_unlock; | |
989 | } | |
990 | ||
fdb694a0 KK |
991 | spin_lock_bh(&queue->lock); |
992 | queue->flags &= ~mask; | |
993 | queue->flags |= flags & mask; | |
994 | spin_unlock_bh(&queue->lock); | |
995 | } | |
996 | ||
9872bec7 PM |
997 | err_out_unlock: |
998 | rcu_read_unlock(); | |
838ab636 | 999 | return ret; |
7af4cc3f HW |
1000 | } |
1001 | ||
7c8d4cb4 | 1002 | static const struct nfnl_callback nfqnl_cb[NFQNL_MSG_MAX] = { |
84a797dd | 1003 | [NFQNL_MSG_PACKET] = { .call_rcu = nfqnl_recv_unsupp, |
37d2e7a2 | 1004 | .attr_count = NFQA_MAX, }, |
84a797dd | 1005 | [NFQNL_MSG_VERDICT] = { .call_rcu = nfqnl_recv_verdict, |
5bf75853 PM |
1006 | .attr_count = NFQA_MAX, |
1007 | .policy = nfqa_verdict_policy }, | |
7af4cc3f | 1008 | [NFQNL_MSG_CONFIG] = { .call = nfqnl_recv_config, |
5bf75853 PM |
1009 | .attr_count = NFQA_CFG_MAX, |
1010 | .policy = nfqa_cfg_policy }, | |
97d32cf9 FW |
1011 | [NFQNL_MSG_VERDICT_BATCH]={ .call_rcu = nfqnl_recv_verdict_batch, |
1012 | .attr_count = NFQA_MAX, | |
1013 | .policy = nfqa_verdict_batch_policy }, | |
7af4cc3f HW |
1014 | }; |
1015 | ||
7c8d4cb4 | 1016 | static const struct nfnetlink_subsystem nfqnl_subsys = { |
7af4cc3f HW |
1017 | .name = "nf_queue", |
1018 | .subsys_id = NFNL_SUBSYS_QUEUE, | |
1019 | .cb_count = NFQNL_MSG_MAX, | |
7af4cc3f HW |
1020 | .cb = nfqnl_cb, |
1021 | }; | |
1022 | ||
838ab636 HW |
1023 | #ifdef CONFIG_PROC_FS |
1024 | struct iter_state { | |
e8179610 | 1025 | struct seq_net_private p; |
838ab636 HW |
1026 | unsigned int bucket; |
1027 | }; | |
1028 | ||
1029 | static struct hlist_node *get_first(struct seq_file *seq) | |
1030 | { | |
1031 | struct iter_state *st = seq->private; | |
e8179610 G |
1032 | struct net *net; |
1033 | struct nfnl_queue_net *q; | |
838ab636 HW |
1034 | |
1035 | if (!st) | |
1036 | return NULL; | |
1037 | ||
e8179610 G |
1038 | net = seq_file_net(seq); |
1039 | q = nfnl_queue_pernet(net); | |
838ab636 | 1040 | for (st->bucket = 0; st->bucket < INSTANCE_BUCKETS; st->bucket++) { |
e8179610 G |
1041 | if (!hlist_empty(&q->instance_table[st->bucket])) |
1042 | return q->instance_table[st->bucket].first; | |
838ab636 HW |
1043 | } |
1044 | return NULL; | |
1045 | } | |
1046 | ||
1047 | static struct hlist_node *get_next(struct seq_file *seq, struct hlist_node *h) | |
1048 | { | |
1049 | struct iter_state *st = seq->private; | |
e8179610 | 1050 | struct net *net = seq_file_net(seq); |
838ab636 HW |
1051 | |
1052 | h = h->next; | |
1053 | while (!h) { | |
e8179610 G |
1054 | struct nfnl_queue_net *q; |
1055 | ||
838ab636 HW |
1056 | if (++st->bucket >= INSTANCE_BUCKETS) |
1057 | return NULL; | |
1058 | ||
e8179610 G |
1059 | q = nfnl_queue_pernet(net); |
1060 | h = q->instance_table[st->bucket].first; | |
838ab636 HW |
1061 | } |
1062 | return h; | |
1063 | } | |
1064 | ||
1065 | static struct hlist_node *get_idx(struct seq_file *seq, loff_t pos) | |
1066 | { | |
1067 | struct hlist_node *head; | |
1068 | head = get_first(seq); | |
1069 | ||
1070 | if (head) | |
1071 | while (pos && (head = get_next(seq, head))) | |
1072 | pos--; | |
1073 | return pos ? NULL : head; | |
1074 | } | |
1075 | ||
e8179610 G |
1076 | static void *seq_start(struct seq_file *s, loff_t *pos) |
1077 | __acquires(nfnl_queue_pernet(seq_file_net(s))->instances_lock) | |
838ab636 | 1078 | { |
e8179610 G |
1079 | spin_lock(&nfnl_queue_pernet(seq_file_net(s))->instances_lock); |
1080 | return get_idx(s, *pos); | |
838ab636 HW |
1081 | } |
1082 | ||
1083 | static void *seq_next(struct seq_file *s, void *v, loff_t *pos) | |
1084 | { | |
1085 | (*pos)++; | |
1086 | return get_next(s, v); | |
1087 | } | |
1088 | ||
1089 | static void seq_stop(struct seq_file *s, void *v) | |
e8179610 | 1090 | __releases(nfnl_queue_pernet(seq_file_net(s))->instances_lock) |
838ab636 | 1091 | { |
e8179610 | 1092 | spin_unlock(&nfnl_queue_pernet(seq_file_net(s))->instances_lock); |
838ab636 HW |
1093 | } |
1094 | ||
1095 | static int seq_show(struct seq_file *s, void *v) | |
1096 | { | |
1097 | const struct nfqnl_instance *inst = v; | |
1098 | ||
1099 | return seq_printf(s, "%5d %6d %5d %1d %5d %5d %5d %8d %2d\n", | |
1100 | inst->queue_num, | |
15e47304 | 1101 | inst->peer_portid, inst->queue_total, |
838ab636 HW |
1102 | inst->copy_mode, inst->copy_range, |
1103 | inst->queue_dropped, inst->queue_user_dropped, | |
5863702a | 1104 | inst->id_sequence, 1); |
838ab636 HW |
1105 | } |
1106 | ||
56b3d975 | 1107 | static const struct seq_operations nfqnl_seq_ops = { |
838ab636 HW |
1108 | .start = seq_start, |
1109 | .next = seq_next, | |
1110 | .stop = seq_stop, | |
1111 | .show = seq_show, | |
1112 | }; | |
1113 | ||
1114 | static int nfqnl_open(struct inode *inode, struct file *file) | |
1115 | { | |
e8179610 | 1116 | return seq_open_net(inode, file, &nfqnl_seq_ops, |
e2da5913 | 1117 | sizeof(struct iter_state)); |
838ab636 HW |
1118 | } |
1119 | ||
da7071d7 | 1120 | static const struct file_operations nfqnl_file_ops = { |
838ab636 HW |
1121 | .owner = THIS_MODULE, |
1122 | .open = nfqnl_open, | |
1123 | .read = seq_read, | |
1124 | .llseek = seq_lseek, | |
e8179610 | 1125 | .release = seq_release_net, |
838ab636 HW |
1126 | }; |
1127 | ||
1128 | #endif /* PROC_FS */ | |
1129 | ||
e8179610 | 1130 | static int __net_init nfnl_queue_net_init(struct net *net) |
7af4cc3f | 1131 | { |
e8179610 G |
1132 | unsigned int i; |
1133 | struct nfnl_queue_net *q = nfnl_queue_pernet(net); | |
601e68e1 | 1134 | |
838ab636 | 1135 | for (i = 0; i < INSTANCE_BUCKETS; i++) |
e8179610 G |
1136 | INIT_HLIST_HEAD(&q->instance_table[i]); |
1137 | ||
1138 | spin_lock_init(&q->instances_lock); | |
1139 | ||
1140 | #ifdef CONFIG_PROC_FS | |
1141 | if (!proc_create("nfnetlink_queue", 0440, | |
1142 | net->nf.proc_netfilter, &nfqnl_file_ops)) | |
1143 | return -ENOMEM; | |
1144 | #endif | |
1145 | return 0; | |
1146 | } | |
1147 | ||
1148 | static void __net_exit nfnl_queue_net_exit(struct net *net) | |
1149 | { | |
1150 | remove_proc_entry("nfnetlink_queue", net->nf.proc_netfilter); | |
1151 | } | |
1152 | ||
1153 | static struct pernet_operations nfnl_queue_net_ops = { | |
1154 | .init = nfnl_queue_net_init, | |
1155 | .exit = nfnl_queue_net_exit, | |
1156 | .id = &nfnl_queue_net_id, | |
1157 | .size = sizeof(struct nfnl_queue_net), | |
1158 | }; | |
1159 | ||
1160 | static int __init nfnetlink_queue_init(void) | |
1161 | { | |
1162 | int status = -ENOMEM; | |
838ab636 | 1163 | |
7af4cc3f HW |
1164 | netlink_register_notifier(&nfqnl_rtnl_notifier); |
1165 | status = nfnetlink_subsys_register(&nfqnl_subsys); | |
1166 | if (status < 0) { | |
e8179610 | 1167 | pr_err("nf_queue: failed to create netlink socket\n"); |
7af4cc3f HW |
1168 | goto cleanup_netlink_notifier; |
1169 | } | |
1170 | ||
e8179610 G |
1171 | status = register_pernet_subsys(&nfnl_queue_net_ops); |
1172 | if (status < 0) { | |
1173 | pr_err("nf_queue: failed to register pernet ops\n"); | |
838ab636 | 1174 | goto cleanup_subsys; |
e8179610 | 1175 | } |
7af4cc3f | 1176 | register_netdevice_notifier(&nfqnl_dev_notifier); |
0360ae41 | 1177 | nf_register_queue_handler(&nfqh); |
7af4cc3f HW |
1178 | return status; |
1179 | ||
838ab636 | 1180 | cleanup_subsys: |
7af4cc3f | 1181 | nfnetlink_subsys_unregister(&nfqnl_subsys); |
7af4cc3f HW |
1182 | cleanup_netlink_notifier: |
1183 | netlink_unregister_notifier(&nfqnl_rtnl_notifier); | |
1184 | return status; | |
1185 | } | |
1186 | ||
65b4b4e8 | 1187 | static void __exit nfnetlink_queue_fini(void) |
7af4cc3f | 1188 | { |
0360ae41 | 1189 | nf_unregister_queue_handler(); |
32292a7f | 1190 | unregister_netdevice_notifier(&nfqnl_dev_notifier); |
e8179610 | 1191 | unregister_pernet_subsys(&nfnl_queue_net_ops); |
32292a7f PM |
1192 | nfnetlink_subsys_unregister(&nfqnl_subsys); |
1193 | netlink_unregister_notifier(&nfqnl_rtnl_notifier); | |
67137f3c JDB |
1194 | |
1195 | rcu_barrier(); /* Wait for completion of call_rcu()'s */ | |
7af4cc3f HW |
1196 | } |
1197 | ||
1198 | MODULE_DESCRIPTION("netfilter packet queue handler"); | |
1199 | MODULE_AUTHOR("Harald Welte <laforge@netfilter.org>"); | |
1200 | MODULE_LICENSE("GPL"); | |
1201 | MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_QUEUE); | |
1202 | ||
65b4b4e8 AM |
1203 | module_init(nfnetlink_queue_init); |
1204 | module_exit(nfnetlink_queue_fini); |