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 | ||
c5f0c0e7 | 230 | static int |
d212dc60 | 231 | nfqnl_zcopy(struct sk_buff *to, struct sk_buff *from, int len, int hlen) |
ae08ce00 ED |
232 | { |
233 | int i, j = 0; | |
234 | int plen = 0; /* length of skb->head fragment */ | |
c5f0c0e7 | 235 | int ret; |
ae08ce00 ED |
236 | struct page *page; |
237 | unsigned int offset; | |
238 | ||
239 | /* dont bother with small payloads */ | |
c5f0c0e7 ZK |
240 | if (len <= skb_tailroom(to)) |
241 | return skb_copy_bits(from, 0, skb_put(to, len), len); | |
ae08ce00 ED |
242 | |
243 | if (hlen) { | |
c5f0c0e7 ZK |
244 | ret = skb_copy_bits(from, 0, skb_put(to, hlen), hlen); |
245 | if (unlikely(ret)) | |
246 | return ret; | |
ae08ce00 ED |
247 | len -= hlen; |
248 | } else { | |
249 | plen = min_t(int, skb_headlen(from), len); | |
250 | if (plen) { | |
251 | page = virt_to_head_page(from->head); | |
252 | offset = from->data - (unsigned char *)page_address(page); | |
253 | __skb_fill_page_desc(to, 0, page, offset, plen); | |
254 | get_page(page); | |
255 | j = 1; | |
256 | len -= plen; | |
257 | } | |
258 | } | |
259 | ||
260 | to->truesize += len + plen; | |
261 | to->len += len + plen; | |
262 | to->data_len += len + plen; | |
263 | ||
c5f0c0e7 ZK |
264 | if (unlikely(skb_orphan_frags(from, GFP_ATOMIC))) { |
265 | skb_tx_error(from); | |
266 | return -ENOMEM; | |
267 | } | |
268 | ||
ae08ce00 ED |
269 | for (i = 0; i < skb_shinfo(from)->nr_frags; i++) { |
270 | if (!len) | |
271 | break; | |
272 | skb_shinfo(to)->frags[j] = skb_shinfo(from)->frags[i]; | |
273 | skb_shinfo(to)->frags[j].size = min_t(int, skb_shinfo(to)->frags[j].size, len); | |
274 | len -= skb_shinfo(to)->frags[j].size; | |
275 | skb_frag_ref(to, j); | |
276 | j++; | |
277 | } | |
278 | skb_shinfo(to)->nr_frags = j; | |
c5f0c0e7 ZK |
279 | |
280 | return 0; | |
ae08ce00 ED |
281 | } |
282 | ||
7237190d FW |
283 | static int nfqnl_put_packet_info(struct sk_buff *nlskb, struct sk_buff *packet) |
284 | { | |
285 | __u32 flags = 0; | |
286 | ||
287 | if (packet->ip_summed == CHECKSUM_PARTIAL) | |
288 | flags = NFQA_SKB_CSUMNOTREADY; | |
289 | if (skb_is_gso(packet)) | |
290 | flags |= NFQA_SKB_GSO; | |
291 | ||
292 | return flags ? nla_put_be32(nlskb, NFQA_SKB_INFO, htonl(flags)) : 0; | |
293 | } | |
294 | ||
7af4cc3f HW |
295 | static struct sk_buff * |
296 | nfqnl_build_packet_message(struct nfqnl_instance *queue, | |
5863702a ED |
297 | struct nf_queue_entry *entry, |
298 | __be32 **packet_id_ptr) | |
7af4cc3f | 299 | { |
7af4cc3f | 300 | size_t size; |
6ee584be | 301 | size_t data_len = 0, cap_len = 0; |
ae08ce00 | 302 | int hlen = 0; |
7af4cc3f | 303 | struct sk_buff *skb; |
5863702a ED |
304 | struct nlattr *nla; |
305 | struct nfqnl_msg_packet_hdr *pmsg; | |
7af4cc3f HW |
306 | struct nlmsghdr *nlh; |
307 | struct nfgenmsg *nfmsg; | |
3e4ead4f JJ |
308 | struct sk_buff *entskb = entry->skb; |
309 | struct net_device *indev; | |
310 | struct net_device *outdev; | |
9cb01766 PNA |
311 | struct nf_conn *ct = NULL; |
312 | enum ip_conntrack_info uninitialized_var(ctinfo); | |
7af4cc3f | 313 | |
573ce260 | 314 | size = nlmsg_total_size(sizeof(struct nfgenmsg)) |
df6fb868 PM |
315 | + nla_total_size(sizeof(struct nfqnl_msg_packet_hdr)) |
316 | + nla_total_size(sizeof(u_int32_t)) /* ifindex */ | |
317 | + nla_total_size(sizeof(u_int32_t)) /* ifindex */ | |
fbcd923c | 318 | #ifdef CONFIG_BRIDGE_NETFILTER |
df6fb868 PM |
319 | + nla_total_size(sizeof(u_int32_t)) /* ifindex */ |
320 | + nla_total_size(sizeof(u_int32_t)) /* ifindex */ | |
fbcd923c | 321 | #endif |
df6fb868 PM |
322 | + nla_total_size(sizeof(u_int32_t)) /* mark */ |
323 | + nla_total_size(sizeof(struct nfqnl_msg_packet_hw)) | |
7237190d | 324 | + nla_total_size(sizeof(u_int32_t)) /* skbinfo */ |
ae08ce00 ED |
325 | + nla_total_size(sizeof(u_int32_t)); /* cap_len */ |
326 | ||
327 | if (entskb->tstamp.tv64) | |
328 | size += nla_total_size(sizeof(struct nfqnl_msg_packet_timestamp)); | |
7af4cc3f | 329 | |
02f014d8 | 330 | outdev = entry->outdev; |
3e4ead4f | 331 | |
c463ac97 | 332 | switch ((enum nfqnl_config_mode)ACCESS_ONCE(queue->copy_mode)) { |
7af4cc3f HW |
333 | case NFQNL_COPY_META: |
334 | case NFQNL_COPY_NONE: | |
7af4cc3f | 335 | break; |
601e68e1 | 336 | |
7af4cc3f | 337 | case NFQNL_COPY_PACKET: |
00bd1cc2 FW |
338 | if (!(queue->flags & NFQA_CFG_F_GSO) && |
339 | entskb->ip_summed == CHECKSUM_PARTIAL && | |
c463ac97 | 340 | skb_checksum_help(entskb)) |
e7dfb09a | 341 | return NULL; |
c463ac97 ED |
342 | |
343 | data_len = ACCESS_ONCE(queue->copy_range); | |
344 | if (data_len == 0 || data_len > entskb->len) | |
3e4ead4f | 345 | data_len = entskb->len; |
601e68e1 | 346 | |
ae08ce00 ED |
347 | |
348 | if (!entskb->head_frag || | |
349 | skb_headlen(entskb) < L1_CACHE_BYTES || | |
350 | skb_shinfo(entskb)->nr_frags >= MAX_SKB_FRAGS) | |
351 | hlen = skb_headlen(entskb); | |
352 | ||
353 | if (skb_has_frag_list(entskb)) | |
354 | hlen = entskb->len; | |
355 | hlen = min_t(int, data_len, hlen); | |
356 | size += sizeof(struct nlattr) + hlen; | |
6ee584be | 357 | cap_len = entskb->len; |
7af4cc3f | 358 | break; |
7af4cc3f HW |
359 | } |
360 | ||
7c622345 PNA |
361 | if (queue->flags & NFQA_CFG_F_CONNTRACK) |
362 | ct = nfqnl_ct_get(entskb, &size, &ctinfo); | |
7af4cc3f | 363 | |
3ab1f683 PM |
364 | skb = nfnetlink_alloc_skb(&init_net, size, queue->peer_portid, |
365 | GFP_ATOMIC); | |
c5f0c0e7 ZK |
366 | if (!skb) { |
367 | skb_tx_error(entskb); | |
3da07c0c | 368 | return NULL; |
c5f0c0e7 | 369 | } |
601e68e1 | 370 | |
3da07c0c | 371 | nlh = nlmsg_put(skb, 0, 0, |
7af4cc3f | 372 | NFNL_SUBSYS_QUEUE << 8 | NFQNL_MSG_PACKET, |
3da07c0c DM |
373 | sizeof(struct nfgenmsg), 0); |
374 | if (!nlh) { | |
c5f0c0e7 | 375 | skb_tx_error(entskb); |
3da07c0c DM |
376 | kfree_skb(skb); |
377 | return NULL; | |
378 | } | |
379 | nfmsg = nlmsg_data(nlh); | |
02f014d8 | 380 | nfmsg->nfgen_family = entry->pf; |
7af4cc3f HW |
381 | nfmsg->version = NFNETLINK_V0; |
382 | nfmsg->res_id = htons(queue->queue_num); | |
383 | ||
5863702a ED |
384 | nla = __nla_reserve(skb, NFQA_PACKET_HDR, sizeof(*pmsg)); |
385 | pmsg = nla_data(nla); | |
386 | pmsg->hw_protocol = entskb->protocol; | |
387 | pmsg->hook = entry->hook; | |
388 | *packet_id_ptr = &pmsg->packet_id; | |
7af4cc3f | 389 | |
02f014d8 | 390 | indev = entry->indev; |
3e4ead4f | 391 | if (indev) { |
fbcd923c | 392 | #ifndef CONFIG_BRIDGE_NETFILTER |
a447189e DM |
393 | if (nla_put_be32(skb, NFQA_IFINDEX_INDEV, htonl(indev->ifindex))) |
394 | goto nla_put_failure; | |
fbcd923c | 395 | #else |
02f014d8 | 396 | if (entry->pf == PF_BRIDGE) { |
fbcd923c | 397 | /* Case 1: indev is physical input device, we need to |
601e68e1 | 398 | * look for bridge group (when called from |
fbcd923c | 399 | * netfilter_bridge) */ |
a447189e DM |
400 | if (nla_put_be32(skb, NFQA_IFINDEX_PHYSINDEV, |
401 | htonl(indev->ifindex)) || | |
fbcd923c | 402 | /* this is the bridge group "brX" */ |
f350a0a8 | 403 | /* rcu_read_lock()ed by __nf_queue */ |
a447189e DM |
404 | nla_put_be32(skb, NFQA_IFINDEX_INDEV, |
405 | htonl(br_port_get_rcu(indev)->br->dev->ifindex))) | |
406 | goto nla_put_failure; | |
fbcd923c HW |
407 | } else { |
408 | /* Case 2: indev is bridge group, we need to look for | |
409 | * physical device (when called from ipv4) */ | |
a447189e DM |
410 | if (nla_put_be32(skb, NFQA_IFINDEX_INDEV, |
411 | htonl(indev->ifindex))) | |
412 | goto nla_put_failure; | |
413 | if (entskb->nf_bridge && entskb->nf_bridge->physindev && | |
414 | nla_put_be32(skb, NFQA_IFINDEX_PHYSINDEV, | |
415 | htonl(entskb->nf_bridge->physindev->ifindex))) | |
416 | goto nla_put_failure; | |
fbcd923c HW |
417 | } |
418 | #endif | |
7af4cc3f HW |
419 | } |
420 | ||
3e4ead4f | 421 | if (outdev) { |
fbcd923c | 422 | #ifndef CONFIG_BRIDGE_NETFILTER |
a447189e DM |
423 | if (nla_put_be32(skb, NFQA_IFINDEX_OUTDEV, htonl(outdev->ifindex))) |
424 | goto nla_put_failure; | |
fbcd923c | 425 | #else |
02f014d8 | 426 | if (entry->pf == PF_BRIDGE) { |
fbcd923c | 427 | /* Case 1: outdev is physical output device, we need to |
601e68e1 | 428 | * look for bridge group (when called from |
fbcd923c | 429 | * netfilter_bridge) */ |
a447189e DM |
430 | if (nla_put_be32(skb, NFQA_IFINDEX_PHYSOUTDEV, |
431 | htonl(outdev->ifindex)) || | |
fbcd923c | 432 | /* this is the bridge group "brX" */ |
f350a0a8 | 433 | /* rcu_read_lock()ed by __nf_queue */ |
a447189e DM |
434 | nla_put_be32(skb, NFQA_IFINDEX_OUTDEV, |
435 | htonl(br_port_get_rcu(outdev)->br->dev->ifindex))) | |
436 | goto nla_put_failure; | |
fbcd923c HW |
437 | } else { |
438 | /* Case 2: outdev is bridge group, we need to look for | |
439 | * physical output device (when called from ipv4) */ | |
a447189e DM |
440 | if (nla_put_be32(skb, NFQA_IFINDEX_OUTDEV, |
441 | htonl(outdev->ifindex))) | |
442 | goto nla_put_failure; | |
443 | if (entskb->nf_bridge && entskb->nf_bridge->physoutdev && | |
444 | nla_put_be32(skb, NFQA_IFINDEX_PHYSOUTDEV, | |
445 | htonl(entskb->nf_bridge->physoutdev->ifindex))) | |
446 | goto nla_put_failure; | |
fbcd923c HW |
447 | } |
448 | #endif | |
7af4cc3f HW |
449 | } |
450 | ||
a447189e DM |
451 | if (entskb->mark && |
452 | nla_put_be32(skb, NFQA_MARK, htonl(entskb->mark))) | |
453 | goto nla_put_failure; | |
7af4cc3f | 454 | |
2c38de4c NC |
455 | if (indev && entskb->dev && |
456 | entskb->mac_header != entskb->network_header) { | |
7af4cc3f | 457 | struct nfqnl_msg_packet_hw phw; |
b95cce35 SH |
458 | int len = dev_parse_header(entskb, phw.hw_addr); |
459 | if (len) { | |
460 | phw.hw_addrlen = htons(len); | |
a447189e DM |
461 | if (nla_put(skb, NFQA_HWADDR, sizeof(phw), &phw)) |
462 | goto nla_put_failure; | |
b95cce35 | 463 | } |
7af4cc3f HW |
464 | } |
465 | ||
b7aa0bf7 | 466 | if (entskb->tstamp.tv64) { |
7af4cc3f | 467 | struct nfqnl_msg_packet_timestamp ts; |
b7aa0bf7 ED |
468 | struct timeval tv = ktime_to_timeval(entskb->tstamp); |
469 | ts.sec = cpu_to_be64(tv.tv_sec); | |
470 | ts.usec = cpu_to_be64(tv.tv_usec); | |
7af4cc3f | 471 | |
a447189e DM |
472 | if (nla_put(skb, NFQA_TIMESTAMP, sizeof(ts), &ts)) |
473 | goto nla_put_failure; | |
7af4cc3f HW |
474 | } |
475 | ||
ae08ce00 ED |
476 | if (ct && nfqnl_ct_put(skb, ct, ctinfo) < 0) |
477 | goto nla_put_failure; | |
478 | ||
479 | if (cap_len > 0 && nla_put_be32(skb, NFQA_CAP_LEN, htonl(cap_len))) | |
480 | goto nla_put_failure; | |
481 | ||
7237190d FW |
482 | if (nfqnl_put_packet_info(skb, entskb)) |
483 | goto nla_put_failure; | |
484 | ||
7af4cc3f | 485 | if (data_len) { |
df6fb868 | 486 | struct nlattr *nla; |
7af4cc3f | 487 | |
ae08ce00 ED |
488 | if (skb_tailroom(skb) < sizeof(*nla) + hlen) |
489 | goto nla_put_failure; | |
7af4cc3f | 490 | |
ae08ce00 | 491 | nla = (struct nlattr *)skb_put(skb, sizeof(*nla)); |
df6fb868 | 492 | nla->nla_type = NFQA_PAYLOAD; |
ae08ce00 | 493 | nla->nla_len = nla_attr_size(data_len); |
7af4cc3f | 494 | |
c5f0c0e7 ZK |
495 | if (nfqnl_zcopy(skb, entskb, data_len, hlen)) |
496 | goto nla_put_failure; | |
7af4cc3f | 497 | } |
601e68e1 | 498 | |
ae08ce00 | 499 | nlh->nlmsg_len = skb->len; |
7af4cc3f HW |
500 | return skb; |
501 | ||
df6fb868 | 502 | nla_put_failure: |
c5f0c0e7 | 503 | skb_tx_error(entskb); |
a6729955 | 504 | kfree_skb(skb); |
e87cc472 | 505 | net_err_ratelimited("nf_queue: error creating packet message\n"); |
7af4cc3f HW |
506 | return NULL; |
507 | } | |
508 | ||
509 | static int | |
a5fedd43 FW |
510 | __nfqnl_enqueue_packet(struct net *net, struct nfqnl_instance *queue, |
511 | struct nf_queue_entry *entry) | |
7af4cc3f | 512 | { |
7af4cc3f | 513 | struct sk_buff *nskb; |
f1585086 | 514 | int err = -ENOBUFS; |
5863702a | 515 | __be32 *packet_id_ptr; |
fdb694a0 | 516 | int failopen = 0; |
7af4cc3f | 517 | |
5863702a | 518 | nskb = nfqnl_build_packet_message(queue, entry, &packet_id_ptr); |
f1585086 FW |
519 | if (nskb == NULL) { |
520 | err = -ENOMEM; | |
0ef0f465 | 521 | goto err_out; |
f1585086 | 522 | } |
7af4cc3f | 523 | spin_lock_bh(&queue->lock); |
601e68e1 | 524 | |
15e47304 | 525 | if (!queue->peer_portid) { |
f1585086 | 526 | err = -EINVAL; |
601e68e1 | 527 | goto err_out_free_nskb; |
f1585086 | 528 | } |
7af4cc3f | 529 | if (queue->queue_total >= queue->queue_maxlen) { |
fdb694a0 KK |
530 | if (queue->flags & NFQA_CFG_F_FAIL_OPEN) { |
531 | failopen = 1; | |
532 | err = 0; | |
533 | } else { | |
534 | queue->queue_dropped++; | |
535 | net_warn_ratelimited("nf_queue: full at %d entries, dropping packets(s)\n", | |
536 | queue->queue_total); | |
537 | } | |
7af4cc3f HW |
538 | goto err_out_free_nskb; |
539 | } | |
5863702a ED |
540 | entry->id = ++queue->id_sequence; |
541 | *packet_id_ptr = htonl(entry->id); | |
7af4cc3f HW |
542 | |
543 | /* nfnetlink_unicast will either free the nskb or add it to a socket */ | |
e8179610 | 544 | err = nfnetlink_unicast(nskb, net, queue->peer_portid, MSG_DONTWAIT); |
0ef0f465 | 545 | if (err < 0) { |
601e68e1 | 546 | queue->queue_user_dropped++; |
7af4cc3f HW |
547 | goto err_out_unlock; |
548 | } | |
549 | ||
550 | __enqueue_entry(queue, entry); | |
551 | ||
552 | spin_unlock_bh(&queue->lock); | |
0ef0f465 | 553 | return 0; |
7af4cc3f HW |
554 | |
555 | err_out_free_nskb: | |
601e68e1 | 556 | kfree_skb(nskb); |
7af4cc3f HW |
557 | err_out_unlock: |
558 | spin_unlock_bh(&queue->lock); | |
fdb694a0 KK |
559 | if (failopen) |
560 | nf_reinject(entry, NF_ACCEPT); | |
0ef0f465 | 561 | err_out: |
f1585086 | 562 | return err; |
7af4cc3f HW |
563 | } |
564 | ||
a5fedd43 FW |
565 | static struct nf_queue_entry * |
566 | nf_queue_entry_dup(struct nf_queue_entry *e) | |
567 | { | |
568 | struct nf_queue_entry *entry = kmemdup(e, e->size, GFP_ATOMIC); | |
569 | if (entry) { | |
570 | if (nf_queue_entry_get_refs(entry)) | |
571 | return entry; | |
572 | kfree(entry); | |
573 | } | |
574 | return NULL; | |
575 | } | |
576 | ||
577 | #ifdef CONFIG_BRIDGE_NETFILTER | |
578 | /* When called from bridge netfilter, skb->data must point to MAC header | |
579 | * before calling skb_gso_segment(). Else, original MAC header is lost | |
580 | * and segmented skbs will be sent to wrong destination. | |
581 | */ | |
582 | static void nf_bridge_adjust_skb_data(struct sk_buff *skb) | |
583 | { | |
584 | if (skb->nf_bridge) | |
585 | __skb_push(skb, skb->network_header - skb->mac_header); | |
586 | } | |
587 | ||
588 | static void nf_bridge_adjust_segmented_data(struct sk_buff *skb) | |
589 | { | |
590 | if (skb->nf_bridge) | |
591 | __skb_pull(skb, skb->network_header - skb->mac_header); | |
592 | } | |
593 | #else | |
594 | #define nf_bridge_adjust_skb_data(s) do {} while (0) | |
595 | #define nf_bridge_adjust_segmented_data(s) do {} while (0) | |
596 | #endif | |
597 | ||
598 | static void free_entry(struct nf_queue_entry *entry) | |
599 | { | |
600 | nf_queue_entry_release_refs(entry); | |
601 | kfree(entry); | |
602 | } | |
603 | ||
604 | static int | |
605 | __nfqnl_enqueue_packet_gso(struct net *net, struct nfqnl_instance *queue, | |
606 | struct sk_buff *skb, struct nf_queue_entry *entry) | |
607 | { | |
608 | int ret = -ENOMEM; | |
609 | struct nf_queue_entry *entry_seg; | |
610 | ||
611 | nf_bridge_adjust_segmented_data(skb); | |
612 | ||
613 | if (skb->next == NULL) { /* last packet, no need to copy entry */ | |
614 | struct sk_buff *gso_skb = entry->skb; | |
615 | entry->skb = skb; | |
616 | ret = __nfqnl_enqueue_packet(net, queue, entry); | |
617 | if (ret) | |
618 | entry->skb = gso_skb; | |
619 | return ret; | |
620 | } | |
621 | ||
622 | skb->next = NULL; | |
623 | ||
624 | entry_seg = nf_queue_entry_dup(entry); | |
625 | if (entry_seg) { | |
626 | entry_seg->skb = skb; | |
627 | ret = __nfqnl_enqueue_packet(net, queue, entry_seg); | |
628 | if (ret) | |
629 | free_entry(entry_seg); | |
630 | } | |
631 | return ret; | |
632 | } | |
633 | ||
634 | static int | |
635 | nfqnl_enqueue_packet(struct nf_queue_entry *entry, unsigned int queuenum) | |
636 | { | |
637 | unsigned int queued; | |
638 | struct nfqnl_instance *queue; | |
639 | struct sk_buff *skb, *segs; | |
640 | int err = -ENOBUFS; | |
641 | struct net *net = dev_net(entry->indev ? | |
642 | entry->indev : entry->outdev); | |
643 | struct nfnl_queue_net *q = nfnl_queue_pernet(net); | |
644 | ||
645 | /* rcu_read_lock()ed by nf_hook_slow() */ | |
646 | queue = instance_lookup(q, queuenum); | |
647 | if (!queue) | |
648 | return -ESRCH; | |
649 | ||
650 | if (queue->copy_mode == NFQNL_COPY_NONE) | |
651 | return -EINVAL; | |
652 | ||
a5fedd43 FW |
653 | skb = entry->skb; |
654 | ||
655 | switch (entry->pf) { | |
656 | case NFPROTO_IPV4: | |
657 | skb->protocol = htons(ETH_P_IP); | |
658 | break; | |
659 | case NFPROTO_IPV6: | |
660 | skb->protocol = htons(ETH_P_IPV6); | |
661 | break; | |
662 | } | |
663 | ||
7b8dfe28 PNA |
664 | if ((queue->flags & NFQA_CFG_F_GSO) || !skb_is_gso(skb)) |
665 | return __nfqnl_enqueue_packet(net, queue, entry); | |
666 | ||
a5fedd43 FW |
667 | nf_bridge_adjust_skb_data(skb); |
668 | segs = skb_gso_segment(skb, 0); | |
669 | /* Does not use PTR_ERR to limit the number of error codes that can be | |
670 | * returned by nf_queue. For instance, callers rely on -ECANCELED to | |
671 | * mean 'ignore this hook'. | |
672 | */ | |
673 | if (IS_ERR(segs)) | |
674 | goto out_err; | |
675 | queued = 0; | |
676 | err = 0; | |
677 | do { | |
678 | struct sk_buff *nskb = segs->next; | |
679 | if (err == 0) | |
680 | err = __nfqnl_enqueue_packet_gso(net, queue, | |
681 | segs, entry); | |
682 | if (err == 0) | |
683 | queued++; | |
684 | else | |
685 | kfree_skb(segs); | |
686 | segs = nskb; | |
687 | } while (segs); | |
688 | ||
689 | if (queued) { | |
690 | if (err) /* some segments are already queued */ | |
691 | free_entry(entry); | |
692 | kfree_skb(skb); | |
693 | return 0; | |
694 | } | |
695 | out_err: | |
696 | nf_bridge_adjust_segmented_data(skb); | |
697 | return err; | |
698 | } | |
699 | ||
7af4cc3f | 700 | static int |
8c88f87c | 701 | nfqnl_mangle(void *data, int data_len, struct nf_queue_entry *e, int diff) |
7af4cc3f | 702 | { |
e2b58a67 | 703 | struct sk_buff *nskb; |
7af4cc3f | 704 | |
d8a585d7 PM |
705 | if (diff < 0) { |
706 | if (pskb_trim(e->skb, data_len)) | |
707 | return -ENOMEM; | |
708 | } else if (diff > 0) { | |
7af4cc3f HW |
709 | if (data_len > 0xFFFF) |
710 | return -EINVAL; | |
711 | if (diff > skb_tailroom(e->skb)) { | |
9a732ed6 AE |
712 | nskb = skb_copy_expand(e->skb, skb_headroom(e->skb), |
713 | diff, GFP_ATOMIC); | |
e2b58a67 | 714 | if (!nskb) { |
1158ba27 | 715 | printk(KERN_WARNING "nf_queue: OOM " |
7af4cc3f | 716 | "in mangle, dropping packet\n"); |
e2b58a67 | 717 | return -ENOMEM; |
7af4cc3f | 718 | } |
e2b58a67 PM |
719 | kfree_skb(e->skb); |
720 | e->skb = nskb; | |
7af4cc3f HW |
721 | } |
722 | skb_put(e->skb, diff); | |
723 | } | |
37d41879 | 724 | if (!skb_make_writable(e->skb, data_len)) |
7af4cc3f | 725 | return -ENOMEM; |
27d7ff46 | 726 | skb_copy_to_linear_data(e->skb, data, data_len); |
e7dfb09a | 727 | e->skb->ip_summed = CHECKSUM_NONE; |
7af4cc3f HW |
728 | return 0; |
729 | } | |
730 | ||
7af4cc3f HW |
731 | static int |
732 | nfqnl_set_mode(struct nfqnl_instance *queue, | |
733 | unsigned char mode, unsigned int range) | |
734 | { | |
c5de0dfd | 735 | int status = 0; |
7af4cc3f HW |
736 | |
737 | spin_lock_bh(&queue->lock); | |
c5de0dfd PM |
738 | switch (mode) { |
739 | case NFQNL_COPY_NONE: | |
740 | case NFQNL_COPY_META: | |
741 | queue->copy_mode = mode; | |
742 | queue->copy_range = 0; | |
743 | break; | |
744 | ||
745 | case NFQNL_COPY_PACKET: | |
746 | queue->copy_mode = mode; | |
ba8d3b0b PNA |
747 | /* We're using struct nlattr which has 16bit nla_len. Note that |
748 | * nla_len includes the header length. Thus, the maximum packet | |
749 | * length that we support is 65531 bytes. We send truncated | |
750 | * packets if the specified length is larger than that. | |
751 | */ | |
752 | if (range > 0xffff - NLA_HDRLEN) | |
753 | queue->copy_range = 0xffff - NLA_HDRLEN; | |
c5de0dfd PM |
754 | else |
755 | queue->copy_range = range; | |
756 | break; | |
757 | ||
758 | default: | |
759 | status = -EINVAL; | |
760 | ||
761 | } | |
7af4cc3f HW |
762 | spin_unlock_bh(&queue->lock); |
763 | ||
764 | return status; | |
765 | } | |
766 | ||
767 | static int | |
02f014d8 | 768 | dev_cmp(struct nf_queue_entry *entry, unsigned long ifindex) |
7af4cc3f | 769 | { |
02f014d8 PM |
770 | if (entry->indev) |
771 | if (entry->indev->ifindex == ifindex) | |
7af4cc3f | 772 | return 1; |
02f014d8 PM |
773 | if (entry->outdev) |
774 | if (entry->outdev->ifindex == ifindex) | |
7af4cc3f | 775 | return 1; |
ef47c6a7 PM |
776 | #ifdef CONFIG_BRIDGE_NETFILTER |
777 | if (entry->skb->nf_bridge) { | |
778 | if (entry->skb->nf_bridge->physindev && | |
779 | entry->skb->nf_bridge->physindev->ifindex == ifindex) | |
780 | return 1; | |
781 | if (entry->skb->nf_bridge->physoutdev && | |
782 | entry->skb->nf_bridge->physoutdev->ifindex == ifindex) | |
783 | return 1; | |
784 | } | |
785 | #endif | |
7af4cc3f HW |
786 | return 0; |
787 | } | |
788 | ||
789 | /* drop all packets with either indev or outdev == ifindex from all queue | |
790 | * instances */ | |
791 | static void | |
e8179610 | 792 | nfqnl_dev_drop(struct net *net, int ifindex) |
7af4cc3f HW |
793 | { |
794 | int i; | |
e8179610 | 795 | struct nfnl_queue_net *q = nfnl_queue_pernet(net); |
601e68e1 | 796 | |
9872bec7 | 797 | rcu_read_lock(); |
7af4cc3f | 798 | |
9872bec7 | 799 | for (i = 0; i < INSTANCE_BUCKETS; i++) { |
7af4cc3f | 800 | struct nfqnl_instance *inst; |
e8179610 | 801 | struct hlist_head *head = &q->instance_table[i]; |
7af4cc3f | 802 | |
b67bfe0d | 803 | hlist_for_each_entry_rcu(inst, head, hlist) |
b43d8d85 | 804 | nfqnl_flush(inst, dev_cmp, ifindex); |
7af4cc3f HW |
805 | } |
806 | ||
9872bec7 | 807 | rcu_read_unlock(); |
7af4cc3f HW |
808 | } |
809 | ||
810 | #define RCV_SKB_FAIL(err) do { netlink_ack(skb, nlh, (err)); return; } while (0) | |
811 | ||
812 | static int | |
813 | nfqnl_rcv_dev_event(struct notifier_block *this, | |
814 | unsigned long event, void *ptr) | |
815 | { | |
816 | struct net_device *dev = ptr; | |
817 | ||
818 | /* Drop any packets associated with the downed device */ | |
819 | if (event == NETDEV_DOWN) | |
e8179610 | 820 | nfqnl_dev_drop(dev_net(dev), dev->ifindex); |
7af4cc3f HW |
821 | return NOTIFY_DONE; |
822 | } | |
823 | ||
824 | static struct notifier_block nfqnl_dev_notifier = { | |
825 | .notifier_call = nfqnl_rcv_dev_event, | |
826 | }; | |
827 | ||
828 | static int | |
829 | nfqnl_rcv_nl_event(struct notifier_block *this, | |
830 | unsigned long event, void *ptr) | |
831 | { | |
832 | struct netlink_notify *n = ptr; | |
e8179610 | 833 | struct nfnl_queue_net *q = nfnl_queue_pernet(n->net); |
7af4cc3f | 834 | |
dee5817e | 835 | if (event == NETLINK_URELEASE && n->protocol == NETLINK_NETFILTER) { |
7af4cc3f HW |
836 | int i; |
837 | ||
15e47304 | 838 | /* destroy all instances for this portid */ |
e8179610 | 839 | spin_lock(&q->instances_lock); |
9872bec7 | 840 | for (i = 0; i < INSTANCE_BUCKETS; i++) { |
b67bfe0d | 841 | struct hlist_node *t2; |
7af4cc3f | 842 | struct nfqnl_instance *inst; |
e8179610 | 843 | struct hlist_head *head = &q->instance_table[i]; |
7af4cc3f | 844 | |
b67bfe0d | 845 | hlist_for_each_entry_safe(inst, t2, head, hlist) { |
e8179610 | 846 | if (n->portid == inst->peer_portid) |
7af4cc3f HW |
847 | __instance_destroy(inst); |
848 | } | |
849 | } | |
e8179610 | 850 | spin_unlock(&q->instances_lock); |
7af4cc3f HW |
851 | } |
852 | return NOTIFY_DONE; | |
853 | } | |
854 | ||
855 | static struct notifier_block nfqnl_rtnl_notifier = { | |
856 | .notifier_call = nfqnl_rcv_nl_event, | |
857 | }; | |
858 | ||
5bf75853 PM |
859 | static const struct nla_policy nfqa_verdict_policy[NFQA_MAX+1] = { |
860 | [NFQA_VERDICT_HDR] = { .len = sizeof(struct nfqnl_msg_verdict_hdr) }, | |
861 | [NFQA_MARK] = { .type = NLA_U32 }, | |
862 | [NFQA_PAYLOAD] = { .type = NLA_UNSPEC }, | |
9cb01766 | 863 | [NFQA_CT] = { .type = NLA_UNSPEC }, |
838ab636 HW |
864 | }; |
865 | ||
97d32cf9 FW |
866 | static const struct nla_policy nfqa_verdict_batch_policy[NFQA_MAX+1] = { |
867 | [NFQA_VERDICT_HDR] = { .len = sizeof(struct nfqnl_msg_verdict_hdr) }, | |
868 | [NFQA_MARK] = { .type = NLA_U32 }, | |
869 | }; | |
870 | ||
e8179610 G |
871 | static struct nfqnl_instance * |
872 | verdict_instance_lookup(struct nfnl_queue_net *q, u16 queue_num, int nlportid) | |
97d32cf9 FW |
873 | { |
874 | struct nfqnl_instance *queue; | |
875 | ||
e8179610 | 876 | queue = instance_lookup(q, queue_num); |
97d32cf9 FW |
877 | if (!queue) |
878 | return ERR_PTR(-ENODEV); | |
879 | ||
15e47304 | 880 | if (queue->peer_portid != nlportid) |
97d32cf9 FW |
881 | return ERR_PTR(-EPERM); |
882 | ||
883 | return queue; | |
884 | } | |
885 | ||
886 | static struct nfqnl_msg_verdict_hdr* | |
887 | verdicthdr_get(const struct nlattr * const nfqa[]) | |
888 | { | |
889 | struct nfqnl_msg_verdict_hdr *vhdr; | |
890 | unsigned int verdict; | |
891 | ||
892 | if (!nfqa[NFQA_VERDICT_HDR]) | |
893 | return NULL; | |
894 | ||
895 | vhdr = nla_data(nfqa[NFQA_VERDICT_HDR]); | |
c6675233 FW |
896 | verdict = ntohl(vhdr->verdict) & NF_VERDICT_MASK; |
897 | if (verdict > NF_MAX_VERDICT || verdict == NF_STOLEN) | |
97d32cf9 FW |
898 | return NULL; |
899 | return vhdr; | |
900 | } | |
901 | ||
902 | static int nfq_id_after(unsigned int id, unsigned int max) | |
903 | { | |
904 | return (int)(id - max) > 0; | |
905 | } | |
906 | ||
907 | static int | |
908 | nfqnl_recv_verdict_batch(struct sock *ctnl, struct sk_buff *skb, | |
909 | const struct nlmsghdr *nlh, | |
910 | const struct nlattr * const nfqa[]) | |
911 | { | |
3da07c0c | 912 | struct nfgenmsg *nfmsg = nlmsg_data(nlh); |
97d32cf9 FW |
913 | struct nf_queue_entry *entry, *tmp; |
914 | unsigned int verdict, maxid; | |
915 | struct nfqnl_msg_verdict_hdr *vhdr; | |
916 | struct nfqnl_instance *queue; | |
917 | LIST_HEAD(batch_list); | |
918 | u16 queue_num = ntohs(nfmsg->res_id); | |
919 | ||
e8179610 G |
920 | struct net *net = sock_net(ctnl); |
921 | struct nfnl_queue_net *q = nfnl_queue_pernet(net); | |
922 | ||
923 | queue = verdict_instance_lookup(q, queue_num, | |
924 | NETLINK_CB(skb).portid); | |
97d32cf9 FW |
925 | if (IS_ERR(queue)) |
926 | return PTR_ERR(queue); | |
927 | ||
928 | vhdr = verdicthdr_get(nfqa); | |
929 | if (!vhdr) | |
930 | return -EINVAL; | |
931 | ||
932 | verdict = ntohl(vhdr->verdict); | |
933 | maxid = ntohl(vhdr->id); | |
934 | ||
935 | spin_lock_bh(&queue->lock); | |
936 | ||
937 | list_for_each_entry_safe(entry, tmp, &queue->queue_list, list) { | |
938 | if (nfq_id_after(entry->id, maxid)) | |
939 | break; | |
940 | __dequeue_entry(queue, entry); | |
941 | list_add_tail(&entry->list, &batch_list); | |
942 | } | |
943 | ||
944 | spin_unlock_bh(&queue->lock); | |
945 | ||
946 | if (list_empty(&batch_list)) | |
947 | return -ENOENT; | |
948 | ||
949 | list_for_each_entry_safe(entry, tmp, &batch_list, list) { | |
950 | if (nfqa[NFQA_MARK]) | |
951 | entry->skb->mark = ntohl(nla_get_be32(nfqa[NFQA_MARK])); | |
952 | nf_reinject(entry, verdict); | |
953 | } | |
954 | return 0; | |
955 | } | |
956 | ||
7af4cc3f HW |
957 | static int |
958 | nfqnl_recv_verdict(struct sock *ctnl, struct sk_buff *skb, | |
39938324 PM |
959 | const struct nlmsghdr *nlh, |
960 | const struct nlattr * const nfqa[]) | |
7af4cc3f | 961 | { |
3da07c0c | 962 | struct nfgenmsg *nfmsg = nlmsg_data(nlh); |
7af4cc3f HW |
963 | u_int16_t queue_num = ntohs(nfmsg->res_id); |
964 | ||
965 | struct nfqnl_msg_verdict_hdr *vhdr; | |
966 | struct nfqnl_instance *queue; | |
967 | unsigned int verdict; | |
02f014d8 | 968 | struct nf_queue_entry *entry; |
8c88f87c PNA |
969 | enum ip_conntrack_info uninitialized_var(ctinfo); |
970 | struct nf_conn *ct = NULL; | |
7af4cc3f | 971 | |
e8179610 G |
972 | struct net *net = sock_net(ctnl); |
973 | struct nfnl_queue_net *q = nfnl_queue_pernet(net); | |
7af4cc3f | 974 | |
e8179610 G |
975 | queue = instance_lookup(q, queue_num); |
976 | if (!queue) | |
977 | queue = verdict_instance_lookup(q, queue_num, | |
978 | NETLINK_CB(skb).portid); | |
97d32cf9 FW |
979 | if (IS_ERR(queue)) |
980 | return PTR_ERR(queue); | |
7af4cc3f | 981 | |
97d32cf9 FW |
982 | vhdr = verdicthdr_get(nfqa); |
983 | if (!vhdr) | |
84a797dd | 984 | return -EINVAL; |
7af4cc3f | 985 | |
7af4cc3f HW |
986 | verdict = ntohl(vhdr->verdict); |
987 | ||
b43d8d85 | 988 | entry = find_dequeue_entry(queue, ntohl(vhdr->id)); |
84a797dd ED |
989 | if (entry == NULL) |
990 | return -ENOENT; | |
7af4cc3f | 991 | |
9cb01766 | 992 | rcu_read_lock(); |
7c622345 PNA |
993 | if (nfqa[NFQA_CT] && (queue->flags & NFQA_CFG_F_CONNTRACK)) |
994 | ct = nfqnl_ct_parse(entry->skb, nfqa[NFQA_CT], &ctinfo); | |
9cb01766 | 995 | |
df6fb868 | 996 | if (nfqa[NFQA_PAYLOAD]) { |
8c88f87c PNA |
997 | u16 payload_len = nla_len(nfqa[NFQA_PAYLOAD]); |
998 | int diff = payload_len - entry->skb->len; | |
999 | ||
df6fb868 | 1000 | if (nfqnl_mangle(nla_data(nfqa[NFQA_PAYLOAD]), |
8c88f87c | 1001 | payload_len, entry, diff) < 0) |
7af4cc3f | 1002 | verdict = NF_DROP; |
8c88f87c | 1003 | |
7c622345 PNA |
1004 | if (ct) |
1005 | nfqnl_ct_seq_adjust(skb, ct, ctinfo, diff); | |
7af4cc3f | 1006 | } |
8c88f87c | 1007 | rcu_read_unlock(); |
7af4cc3f | 1008 | |
df6fb868 | 1009 | if (nfqa[NFQA_MARK]) |
ea3a66ff | 1010 | entry->skb->mark = ntohl(nla_get_be32(nfqa[NFQA_MARK])); |
601e68e1 | 1011 | |
4b3d15ef | 1012 | nf_reinject(entry, verdict); |
7af4cc3f HW |
1013 | return 0; |
1014 | } | |
1015 | ||
1016 | static int | |
1017 | nfqnl_recv_unsupp(struct sock *ctnl, struct sk_buff *skb, | |
39938324 PM |
1018 | const struct nlmsghdr *nlh, |
1019 | const struct nlattr * const nfqa[]) | |
7af4cc3f HW |
1020 | { |
1021 | return -ENOTSUPP; | |
1022 | } | |
1023 | ||
5bf75853 PM |
1024 | static const struct nla_policy nfqa_cfg_policy[NFQA_CFG_MAX+1] = { |
1025 | [NFQA_CFG_CMD] = { .len = sizeof(struct nfqnl_msg_config_cmd) }, | |
1026 | [NFQA_CFG_PARAMS] = { .len = sizeof(struct nfqnl_msg_config_params) }, | |
838ab636 HW |
1027 | }; |
1028 | ||
e3ac5298 | 1029 | static const struct nf_queue_handler nfqh = { |
bbd86b9f HW |
1030 | .outfn = &nfqnl_enqueue_packet, |
1031 | }; | |
1032 | ||
7af4cc3f HW |
1033 | static int |
1034 | nfqnl_recv_config(struct sock *ctnl, struct sk_buff *skb, | |
39938324 PM |
1035 | const struct nlmsghdr *nlh, |
1036 | const struct nlattr * const nfqa[]) | |
7af4cc3f | 1037 | { |
3da07c0c | 1038 | struct nfgenmsg *nfmsg = nlmsg_data(nlh); |
7af4cc3f HW |
1039 | u_int16_t queue_num = ntohs(nfmsg->res_id); |
1040 | struct nfqnl_instance *queue; | |
9872bec7 | 1041 | struct nfqnl_msg_config_cmd *cmd = NULL; |
e8179610 G |
1042 | struct net *net = sock_net(ctnl); |
1043 | struct nfnl_queue_net *q = nfnl_queue_pernet(net); | |
838ab636 | 1044 | int ret = 0; |
7af4cc3f | 1045 | |
9872bec7 PM |
1046 | if (nfqa[NFQA_CFG_CMD]) { |
1047 | cmd = nla_data(nfqa[NFQA_CFG_CMD]); | |
1048 | ||
0360ae41 | 1049 | /* Obsolete commands without queue context */ |
9872bec7 | 1050 | switch (cmd->command) { |
0360ae41 FW |
1051 | case NFQNL_CFG_CMD_PF_BIND: return 0; |
1052 | case NFQNL_CFG_CMD_PF_UNBIND: return 0; | |
9872bec7 | 1053 | } |
9872bec7 PM |
1054 | } |
1055 | ||
1056 | rcu_read_lock(); | |
e8179610 | 1057 | queue = instance_lookup(q, queue_num); |
15e47304 | 1058 | if (queue && queue->peer_portid != NETLINK_CB(skb).portid) { |
a3c8e7fd | 1059 | ret = -EPERM; |
9872bec7 | 1060 | goto err_out_unlock; |
a3c8e7fd PM |
1061 | } |
1062 | ||
9872bec7 | 1063 | if (cmd != NULL) { |
7af4cc3f HW |
1064 | switch (cmd->command) { |
1065 | case NFQNL_CFG_CMD_BIND: | |
9872bec7 PM |
1066 | if (queue) { |
1067 | ret = -EBUSY; | |
1068 | goto err_out_unlock; | |
1069 | } | |
e8179610 G |
1070 | queue = instance_create(q, queue_num, |
1071 | NETLINK_CB(skb).portid); | |
baab2ce7 PM |
1072 | if (IS_ERR(queue)) { |
1073 | ret = PTR_ERR(queue); | |
9872bec7 PM |
1074 | goto err_out_unlock; |
1075 | } | |
7af4cc3f HW |
1076 | break; |
1077 | case NFQNL_CFG_CMD_UNBIND: | |
9872bec7 PM |
1078 | if (!queue) { |
1079 | ret = -ENODEV; | |
1080 | goto err_out_unlock; | |
1081 | } | |
e8179610 | 1082 | instance_destroy(q, queue); |
7af4cc3f HW |
1083 | break; |
1084 | case NFQNL_CFG_CMD_PF_BIND: | |
7af4cc3f | 1085 | case NFQNL_CFG_CMD_PF_UNBIND: |
7af4cc3f HW |
1086 | break; |
1087 | default: | |
cd21f0ac | 1088 | ret = -ENOTSUPP; |
838ab636 | 1089 | break; |
7af4cc3f | 1090 | } |
7af4cc3f HW |
1091 | } |
1092 | ||
df6fb868 | 1093 | if (nfqa[NFQA_CFG_PARAMS]) { |
7af4cc3f | 1094 | struct nfqnl_msg_config_params *params; |
7af4cc3f | 1095 | |
406dbfc9 | 1096 | if (!queue) { |
a3c8e7fd | 1097 | ret = -ENODEV; |
9872bec7 | 1098 | goto err_out_unlock; |
406dbfc9 | 1099 | } |
df6fb868 | 1100 | params = nla_data(nfqa[NFQA_CFG_PARAMS]); |
7af4cc3f HW |
1101 | nfqnl_set_mode(queue, params->copy_mode, |
1102 | ntohl(params->copy_range)); | |
1103 | } | |
1104 | ||
df6fb868 | 1105 | if (nfqa[NFQA_CFG_QUEUE_MAXLEN]) { |
829e17a1 | 1106 | __be32 *queue_maxlen; |
a3c8e7fd PM |
1107 | |
1108 | if (!queue) { | |
1109 | ret = -ENODEV; | |
9872bec7 | 1110 | goto err_out_unlock; |
a3c8e7fd | 1111 | } |
df6fb868 | 1112 | queue_maxlen = nla_data(nfqa[NFQA_CFG_QUEUE_MAXLEN]); |
829e17a1 EL |
1113 | spin_lock_bh(&queue->lock); |
1114 | queue->queue_maxlen = ntohl(*queue_maxlen); | |
1115 | spin_unlock_bh(&queue->lock); | |
1116 | } | |
1117 | ||
fdb694a0 KK |
1118 | if (nfqa[NFQA_CFG_FLAGS]) { |
1119 | __u32 flags, mask; | |
1120 | ||
1121 | if (!queue) { | |
1122 | ret = -ENODEV; | |
1123 | goto err_out_unlock; | |
1124 | } | |
1125 | ||
1126 | if (!nfqa[NFQA_CFG_MASK]) { | |
1127 | /* A mask is needed to specify which flags are being | |
1128 | * changed. | |
1129 | */ | |
1130 | ret = -EINVAL; | |
1131 | goto err_out_unlock; | |
1132 | } | |
1133 | ||
1134 | flags = ntohl(nla_get_be32(nfqa[NFQA_CFG_FLAGS])); | |
1135 | mask = ntohl(nla_get_be32(nfqa[NFQA_CFG_MASK])); | |
1136 | ||
46ba5a25 KK |
1137 | if (flags >= NFQA_CFG_F_MAX) { |
1138 | ret = -EOPNOTSUPP; | |
1139 | goto err_out_unlock; | |
1140 | } | |
1141 | ||
fdb694a0 KK |
1142 | spin_lock_bh(&queue->lock); |
1143 | queue->flags &= ~mask; | |
1144 | queue->flags |= flags & mask; | |
1145 | spin_unlock_bh(&queue->lock); | |
1146 | } | |
1147 | ||
9872bec7 PM |
1148 | err_out_unlock: |
1149 | rcu_read_unlock(); | |
838ab636 | 1150 | return ret; |
7af4cc3f HW |
1151 | } |
1152 | ||
7c8d4cb4 | 1153 | static const struct nfnl_callback nfqnl_cb[NFQNL_MSG_MAX] = { |
84a797dd | 1154 | [NFQNL_MSG_PACKET] = { .call_rcu = nfqnl_recv_unsupp, |
37d2e7a2 | 1155 | .attr_count = NFQA_MAX, }, |
84a797dd | 1156 | [NFQNL_MSG_VERDICT] = { .call_rcu = nfqnl_recv_verdict, |
5bf75853 PM |
1157 | .attr_count = NFQA_MAX, |
1158 | .policy = nfqa_verdict_policy }, | |
7af4cc3f | 1159 | [NFQNL_MSG_CONFIG] = { .call = nfqnl_recv_config, |
5bf75853 PM |
1160 | .attr_count = NFQA_CFG_MAX, |
1161 | .policy = nfqa_cfg_policy }, | |
97d32cf9 FW |
1162 | [NFQNL_MSG_VERDICT_BATCH]={ .call_rcu = nfqnl_recv_verdict_batch, |
1163 | .attr_count = NFQA_MAX, | |
1164 | .policy = nfqa_verdict_batch_policy }, | |
7af4cc3f HW |
1165 | }; |
1166 | ||
7c8d4cb4 | 1167 | static const struct nfnetlink_subsystem nfqnl_subsys = { |
7af4cc3f HW |
1168 | .name = "nf_queue", |
1169 | .subsys_id = NFNL_SUBSYS_QUEUE, | |
1170 | .cb_count = NFQNL_MSG_MAX, | |
7af4cc3f HW |
1171 | .cb = nfqnl_cb, |
1172 | }; | |
1173 | ||
838ab636 HW |
1174 | #ifdef CONFIG_PROC_FS |
1175 | struct iter_state { | |
e8179610 | 1176 | struct seq_net_private p; |
838ab636 HW |
1177 | unsigned int bucket; |
1178 | }; | |
1179 | ||
1180 | static struct hlist_node *get_first(struct seq_file *seq) | |
1181 | { | |
1182 | struct iter_state *st = seq->private; | |
e8179610 G |
1183 | struct net *net; |
1184 | struct nfnl_queue_net *q; | |
838ab636 HW |
1185 | |
1186 | if (!st) | |
1187 | return NULL; | |
1188 | ||
e8179610 G |
1189 | net = seq_file_net(seq); |
1190 | q = nfnl_queue_pernet(net); | |
838ab636 | 1191 | for (st->bucket = 0; st->bucket < INSTANCE_BUCKETS; st->bucket++) { |
e8179610 G |
1192 | if (!hlist_empty(&q->instance_table[st->bucket])) |
1193 | return q->instance_table[st->bucket].first; | |
838ab636 HW |
1194 | } |
1195 | return NULL; | |
1196 | } | |
1197 | ||
1198 | static struct hlist_node *get_next(struct seq_file *seq, struct hlist_node *h) | |
1199 | { | |
1200 | struct iter_state *st = seq->private; | |
e8179610 | 1201 | struct net *net = seq_file_net(seq); |
838ab636 HW |
1202 | |
1203 | h = h->next; | |
1204 | while (!h) { | |
e8179610 G |
1205 | struct nfnl_queue_net *q; |
1206 | ||
838ab636 HW |
1207 | if (++st->bucket >= INSTANCE_BUCKETS) |
1208 | return NULL; | |
1209 | ||
e8179610 G |
1210 | q = nfnl_queue_pernet(net); |
1211 | h = q->instance_table[st->bucket].first; | |
838ab636 HW |
1212 | } |
1213 | return h; | |
1214 | } | |
1215 | ||
1216 | static struct hlist_node *get_idx(struct seq_file *seq, loff_t pos) | |
1217 | { | |
1218 | struct hlist_node *head; | |
1219 | head = get_first(seq); | |
1220 | ||
1221 | if (head) | |
1222 | while (pos && (head = get_next(seq, head))) | |
1223 | pos--; | |
1224 | return pos ? NULL : head; | |
1225 | } | |
1226 | ||
e8179610 G |
1227 | static void *seq_start(struct seq_file *s, loff_t *pos) |
1228 | __acquires(nfnl_queue_pernet(seq_file_net(s))->instances_lock) | |
838ab636 | 1229 | { |
e8179610 G |
1230 | spin_lock(&nfnl_queue_pernet(seq_file_net(s))->instances_lock); |
1231 | return get_idx(s, *pos); | |
838ab636 HW |
1232 | } |
1233 | ||
1234 | static void *seq_next(struct seq_file *s, void *v, loff_t *pos) | |
1235 | { | |
1236 | (*pos)++; | |
1237 | return get_next(s, v); | |
1238 | } | |
1239 | ||
1240 | static void seq_stop(struct seq_file *s, void *v) | |
e8179610 | 1241 | __releases(nfnl_queue_pernet(seq_file_net(s))->instances_lock) |
838ab636 | 1242 | { |
e8179610 | 1243 | spin_unlock(&nfnl_queue_pernet(seq_file_net(s))->instances_lock); |
838ab636 HW |
1244 | } |
1245 | ||
1246 | static int seq_show(struct seq_file *s, void *v) | |
1247 | { | |
1248 | const struct nfqnl_instance *inst = v; | |
1249 | ||
1250 | return seq_printf(s, "%5d %6d %5d %1d %5d %5d %5d %8d %2d\n", | |
1251 | inst->queue_num, | |
15e47304 | 1252 | inst->peer_portid, inst->queue_total, |
838ab636 HW |
1253 | inst->copy_mode, inst->copy_range, |
1254 | inst->queue_dropped, inst->queue_user_dropped, | |
5863702a | 1255 | inst->id_sequence, 1); |
838ab636 HW |
1256 | } |
1257 | ||
56b3d975 | 1258 | static const struct seq_operations nfqnl_seq_ops = { |
838ab636 HW |
1259 | .start = seq_start, |
1260 | .next = seq_next, | |
1261 | .stop = seq_stop, | |
1262 | .show = seq_show, | |
1263 | }; | |
1264 | ||
1265 | static int nfqnl_open(struct inode *inode, struct file *file) | |
1266 | { | |
e8179610 | 1267 | return seq_open_net(inode, file, &nfqnl_seq_ops, |
e2da5913 | 1268 | sizeof(struct iter_state)); |
838ab636 HW |
1269 | } |
1270 | ||
da7071d7 | 1271 | static const struct file_operations nfqnl_file_ops = { |
838ab636 HW |
1272 | .owner = THIS_MODULE, |
1273 | .open = nfqnl_open, | |
1274 | .read = seq_read, | |
1275 | .llseek = seq_lseek, | |
e8179610 | 1276 | .release = seq_release_net, |
838ab636 HW |
1277 | }; |
1278 | ||
1279 | #endif /* PROC_FS */ | |
1280 | ||
e8179610 | 1281 | static int __net_init nfnl_queue_net_init(struct net *net) |
7af4cc3f | 1282 | { |
e8179610 G |
1283 | unsigned int i; |
1284 | struct nfnl_queue_net *q = nfnl_queue_pernet(net); | |
601e68e1 | 1285 | |
838ab636 | 1286 | for (i = 0; i < INSTANCE_BUCKETS; i++) |
e8179610 G |
1287 | INIT_HLIST_HEAD(&q->instance_table[i]); |
1288 | ||
1289 | spin_lock_init(&q->instances_lock); | |
1290 | ||
1291 | #ifdef CONFIG_PROC_FS | |
1292 | if (!proc_create("nfnetlink_queue", 0440, | |
1293 | net->nf.proc_netfilter, &nfqnl_file_ops)) | |
1294 | return -ENOMEM; | |
1295 | #endif | |
1296 | return 0; | |
1297 | } | |
1298 | ||
1299 | static void __net_exit nfnl_queue_net_exit(struct net *net) | |
1300 | { | |
e778f56e | 1301 | #ifdef CONFIG_PROC_FS |
e8179610 | 1302 | remove_proc_entry("nfnetlink_queue", net->nf.proc_netfilter); |
e778f56e | 1303 | #endif |
e8179610 G |
1304 | } |
1305 | ||
1306 | static struct pernet_operations nfnl_queue_net_ops = { | |
1307 | .init = nfnl_queue_net_init, | |
1308 | .exit = nfnl_queue_net_exit, | |
1309 | .id = &nfnl_queue_net_id, | |
1310 | .size = sizeof(struct nfnl_queue_net), | |
1311 | }; | |
1312 | ||
1313 | static int __init nfnetlink_queue_init(void) | |
1314 | { | |
1315 | int status = -ENOMEM; | |
838ab636 | 1316 | |
7af4cc3f HW |
1317 | netlink_register_notifier(&nfqnl_rtnl_notifier); |
1318 | status = nfnetlink_subsys_register(&nfqnl_subsys); | |
1319 | if (status < 0) { | |
e8179610 | 1320 | pr_err("nf_queue: failed to create netlink socket\n"); |
7af4cc3f HW |
1321 | goto cleanup_netlink_notifier; |
1322 | } | |
1323 | ||
e8179610 G |
1324 | status = register_pernet_subsys(&nfnl_queue_net_ops); |
1325 | if (status < 0) { | |
1326 | pr_err("nf_queue: failed to register pernet ops\n"); | |
838ab636 | 1327 | goto cleanup_subsys; |
e8179610 | 1328 | } |
7af4cc3f | 1329 | register_netdevice_notifier(&nfqnl_dev_notifier); |
0360ae41 | 1330 | nf_register_queue_handler(&nfqh); |
7af4cc3f HW |
1331 | return status; |
1332 | ||
838ab636 | 1333 | cleanup_subsys: |
7af4cc3f | 1334 | nfnetlink_subsys_unregister(&nfqnl_subsys); |
7af4cc3f HW |
1335 | cleanup_netlink_notifier: |
1336 | netlink_unregister_notifier(&nfqnl_rtnl_notifier); | |
1337 | return status; | |
1338 | } | |
1339 | ||
65b4b4e8 | 1340 | static void __exit nfnetlink_queue_fini(void) |
7af4cc3f | 1341 | { |
0360ae41 | 1342 | nf_unregister_queue_handler(); |
32292a7f | 1343 | unregister_netdevice_notifier(&nfqnl_dev_notifier); |
e8179610 | 1344 | unregister_pernet_subsys(&nfnl_queue_net_ops); |
32292a7f PM |
1345 | nfnetlink_subsys_unregister(&nfqnl_subsys); |
1346 | netlink_unregister_notifier(&nfqnl_rtnl_notifier); | |
67137f3c JDB |
1347 | |
1348 | rcu_barrier(); /* Wait for completion of call_rcu()'s */ | |
7af4cc3f HW |
1349 | } |
1350 | ||
1351 | MODULE_DESCRIPTION("netfilter packet queue handler"); | |
1352 | MODULE_AUTHOR("Harald Welte <laforge@netfilter.org>"); | |
1353 | MODULE_LICENSE("GPL"); | |
1354 | MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_QUEUE); | |
1355 | ||
65b4b4e8 AM |
1356 | module_init(nfnetlink_queue_init); |
1357 | module_exit(nfnetlink_queue_fini); |