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Commit | Line | Data |
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7af4cc3f HW |
1 | /* |
2 | * This is a module which is used for queueing packets and communicating with | |
67137f3c | 3 | * userspace via nfnetlink. |
7af4cc3f HW |
4 | * |
5 | * (C) 2005 by Harald Welte <laforge@netfilter.org> | |
4ad9d4fa | 6 | * (C) 2007 by Patrick McHardy <kaber@trash.net> |
7af4cc3f HW |
7 | * |
8 | * Based on the old ipv4-only ip_queue.c: | |
9 | * (C) 2000-2002 James Morris <jmorris@intercode.com.au> | |
10 | * (C) 2003-2005 Netfilter Core Team <coreteam@netfilter.org> | |
11 | * | |
12 | * This program is free software; you can redistribute it and/or modify | |
13 | * it under the terms of the GNU General Public License version 2 as | |
14 | * published by the Free Software Foundation. | |
15 | * | |
16 | */ | |
17 | #include <linux/module.h> | |
18 | #include <linux/skbuff.h> | |
19 | #include <linux/init.h> | |
20 | #include <linux/spinlock.h> | |
5a0e3ad6 | 21 | #include <linux/slab.h> |
7af4cc3f HW |
22 | #include <linux/notifier.h> |
23 | #include <linux/netdevice.h> | |
24 | #include <linux/netfilter.h> | |
838ab636 | 25 | #include <linux/proc_fs.h> |
7af4cc3f HW |
26 | #include <linux/netfilter_ipv4.h> |
27 | #include <linux/netfilter_ipv6.h> | |
28 | #include <linux/netfilter/nfnetlink.h> | |
29 | #include <linux/netfilter/nfnetlink_queue.h> | |
30 | #include <linux/list.h> | |
31 | #include <net/sock.h> | |
c01cd429 | 32 | #include <net/netfilter/nf_queue.h> |
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 | ||
7237190d FW |
275 | static int nfqnl_put_packet_info(struct sk_buff *nlskb, struct sk_buff *packet) |
276 | { | |
277 | __u32 flags = 0; | |
278 | ||
279 | if (packet->ip_summed == CHECKSUM_PARTIAL) | |
280 | flags = NFQA_SKB_CSUMNOTREADY; | |
281 | if (skb_is_gso(packet)) | |
282 | flags |= NFQA_SKB_GSO; | |
283 | ||
284 | return flags ? nla_put_be32(nlskb, NFQA_SKB_INFO, htonl(flags)) : 0; | |
285 | } | |
286 | ||
7af4cc3f HW |
287 | static struct sk_buff * |
288 | nfqnl_build_packet_message(struct nfqnl_instance *queue, | |
5863702a ED |
289 | struct nf_queue_entry *entry, |
290 | __be32 **packet_id_ptr) | |
7af4cc3f | 291 | { |
7af4cc3f | 292 | size_t size; |
6ee584be | 293 | size_t data_len = 0, cap_len = 0; |
ae08ce00 | 294 | int hlen = 0; |
7af4cc3f | 295 | struct sk_buff *skb; |
5863702a ED |
296 | struct nlattr *nla; |
297 | struct nfqnl_msg_packet_hdr *pmsg; | |
7af4cc3f HW |
298 | struct nlmsghdr *nlh; |
299 | struct nfgenmsg *nfmsg; | |
3e4ead4f JJ |
300 | struct sk_buff *entskb = entry->skb; |
301 | struct net_device *indev; | |
302 | struct net_device *outdev; | |
9cb01766 PNA |
303 | struct nf_conn *ct = NULL; |
304 | enum ip_conntrack_info uninitialized_var(ctinfo); | |
7af4cc3f | 305 | |
573ce260 | 306 | size = nlmsg_total_size(sizeof(struct nfgenmsg)) |
df6fb868 PM |
307 | + nla_total_size(sizeof(struct nfqnl_msg_packet_hdr)) |
308 | + nla_total_size(sizeof(u_int32_t)) /* ifindex */ | |
309 | + nla_total_size(sizeof(u_int32_t)) /* ifindex */ | |
fbcd923c | 310 | #ifdef CONFIG_BRIDGE_NETFILTER |
df6fb868 PM |
311 | + nla_total_size(sizeof(u_int32_t)) /* ifindex */ |
312 | + nla_total_size(sizeof(u_int32_t)) /* ifindex */ | |
fbcd923c | 313 | #endif |
df6fb868 PM |
314 | + nla_total_size(sizeof(u_int32_t)) /* mark */ |
315 | + nla_total_size(sizeof(struct nfqnl_msg_packet_hw)) | |
7237190d | 316 | + nla_total_size(sizeof(u_int32_t)) /* skbinfo */ |
ae08ce00 ED |
317 | + nla_total_size(sizeof(u_int32_t)); /* cap_len */ |
318 | ||
319 | if (entskb->tstamp.tv64) | |
320 | size += nla_total_size(sizeof(struct nfqnl_msg_packet_timestamp)); | |
7af4cc3f | 321 | |
02f014d8 | 322 | outdev = entry->outdev; |
3e4ead4f | 323 | |
c463ac97 | 324 | switch ((enum nfqnl_config_mode)ACCESS_ONCE(queue->copy_mode)) { |
7af4cc3f HW |
325 | case NFQNL_COPY_META: |
326 | case NFQNL_COPY_NONE: | |
7af4cc3f | 327 | break; |
601e68e1 | 328 | |
7af4cc3f | 329 | case NFQNL_COPY_PACKET: |
00bd1cc2 FW |
330 | if (!(queue->flags & NFQA_CFG_F_GSO) && |
331 | entskb->ip_summed == CHECKSUM_PARTIAL && | |
c463ac97 | 332 | skb_checksum_help(entskb)) |
e7dfb09a | 333 | return NULL; |
c463ac97 ED |
334 | |
335 | data_len = ACCESS_ONCE(queue->copy_range); | |
336 | if (data_len == 0 || data_len > entskb->len) | |
3e4ead4f | 337 | data_len = entskb->len; |
601e68e1 | 338 | |
ae08ce00 ED |
339 | |
340 | if (!entskb->head_frag || | |
341 | skb_headlen(entskb) < L1_CACHE_BYTES || | |
342 | skb_shinfo(entskb)->nr_frags >= MAX_SKB_FRAGS) | |
343 | hlen = skb_headlen(entskb); | |
344 | ||
345 | if (skb_has_frag_list(entskb)) | |
346 | hlen = entskb->len; | |
347 | hlen = min_t(int, data_len, hlen); | |
348 | size += sizeof(struct nlattr) + hlen; | |
6ee584be | 349 | cap_len = entskb->len; |
7af4cc3f | 350 | break; |
7af4cc3f HW |
351 | } |
352 | ||
7c622345 PNA |
353 | if (queue->flags & NFQA_CFG_F_CONNTRACK) |
354 | ct = nfqnl_ct_get(entskb, &size, &ctinfo); | |
7af4cc3f | 355 | |
3ab1f683 PM |
356 | skb = nfnetlink_alloc_skb(&init_net, size, queue->peer_portid, |
357 | GFP_ATOMIC); | |
7af4cc3f | 358 | if (!skb) |
3da07c0c | 359 | return NULL; |
601e68e1 | 360 | |
3da07c0c | 361 | nlh = nlmsg_put(skb, 0, 0, |
7af4cc3f | 362 | NFNL_SUBSYS_QUEUE << 8 | NFQNL_MSG_PACKET, |
3da07c0c DM |
363 | sizeof(struct nfgenmsg), 0); |
364 | if (!nlh) { | |
365 | kfree_skb(skb); | |
366 | return NULL; | |
367 | } | |
368 | nfmsg = nlmsg_data(nlh); | |
02f014d8 | 369 | nfmsg->nfgen_family = entry->pf; |
7af4cc3f HW |
370 | nfmsg->version = NFNETLINK_V0; |
371 | nfmsg->res_id = htons(queue->queue_num); | |
372 | ||
5863702a ED |
373 | nla = __nla_reserve(skb, NFQA_PACKET_HDR, sizeof(*pmsg)); |
374 | pmsg = nla_data(nla); | |
375 | pmsg->hw_protocol = entskb->protocol; | |
376 | pmsg->hook = entry->hook; | |
377 | *packet_id_ptr = &pmsg->packet_id; | |
7af4cc3f | 378 | |
02f014d8 | 379 | indev = entry->indev; |
3e4ead4f | 380 | if (indev) { |
fbcd923c | 381 | #ifndef CONFIG_BRIDGE_NETFILTER |
a447189e DM |
382 | if (nla_put_be32(skb, NFQA_IFINDEX_INDEV, htonl(indev->ifindex))) |
383 | goto nla_put_failure; | |
fbcd923c | 384 | #else |
02f014d8 | 385 | if (entry->pf == PF_BRIDGE) { |
fbcd923c | 386 | /* Case 1: indev is physical input device, we need to |
601e68e1 | 387 | * look for bridge group (when called from |
fbcd923c | 388 | * netfilter_bridge) */ |
a447189e DM |
389 | if (nla_put_be32(skb, NFQA_IFINDEX_PHYSINDEV, |
390 | htonl(indev->ifindex)) || | |
fbcd923c | 391 | /* this is the bridge group "brX" */ |
f350a0a8 | 392 | /* rcu_read_lock()ed by __nf_queue */ |
a447189e DM |
393 | nla_put_be32(skb, NFQA_IFINDEX_INDEV, |
394 | htonl(br_port_get_rcu(indev)->br->dev->ifindex))) | |
395 | goto nla_put_failure; | |
fbcd923c HW |
396 | } else { |
397 | /* Case 2: indev is bridge group, we need to look for | |
398 | * physical device (when called from ipv4) */ | |
a447189e DM |
399 | if (nla_put_be32(skb, NFQA_IFINDEX_INDEV, |
400 | htonl(indev->ifindex))) | |
401 | goto nla_put_failure; | |
402 | if (entskb->nf_bridge && entskb->nf_bridge->physindev && | |
403 | nla_put_be32(skb, NFQA_IFINDEX_PHYSINDEV, | |
404 | htonl(entskb->nf_bridge->physindev->ifindex))) | |
405 | goto nla_put_failure; | |
fbcd923c HW |
406 | } |
407 | #endif | |
7af4cc3f HW |
408 | } |
409 | ||
3e4ead4f | 410 | if (outdev) { |
fbcd923c | 411 | #ifndef CONFIG_BRIDGE_NETFILTER |
a447189e DM |
412 | if (nla_put_be32(skb, NFQA_IFINDEX_OUTDEV, htonl(outdev->ifindex))) |
413 | goto nla_put_failure; | |
fbcd923c | 414 | #else |
02f014d8 | 415 | if (entry->pf == PF_BRIDGE) { |
fbcd923c | 416 | /* Case 1: outdev is physical output device, we need to |
601e68e1 | 417 | * look for bridge group (when called from |
fbcd923c | 418 | * netfilter_bridge) */ |
a447189e DM |
419 | if (nla_put_be32(skb, NFQA_IFINDEX_PHYSOUTDEV, |
420 | htonl(outdev->ifindex)) || | |
fbcd923c | 421 | /* this is the bridge group "brX" */ |
f350a0a8 | 422 | /* rcu_read_lock()ed by __nf_queue */ |
a447189e DM |
423 | nla_put_be32(skb, NFQA_IFINDEX_OUTDEV, |
424 | htonl(br_port_get_rcu(outdev)->br->dev->ifindex))) | |
425 | goto nla_put_failure; | |
fbcd923c HW |
426 | } else { |
427 | /* Case 2: outdev is bridge group, we need to look for | |
428 | * physical output device (when called from ipv4) */ | |
a447189e DM |
429 | if (nla_put_be32(skb, NFQA_IFINDEX_OUTDEV, |
430 | htonl(outdev->ifindex))) | |
431 | goto nla_put_failure; | |
432 | if (entskb->nf_bridge && entskb->nf_bridge->physoutdev && | |
433 | nla_put_be32(skb, NFQA_IFINDEX_PHYSOUTDEV, | |
434 | htonl(entskb->nf_bridge->physoutdev->ifindex))) | |
435 | goto nla_put_failure; | |
fbcd923c HW |
436 | } |
437 | #endif | |
7af4cc3f HW |
438 | } |
439 | ||
a447189e DM |
440 | if (entskb->mark && |
441 | nla_put_be32(skb, NFQA_MARK, htonl(entskb->mark))) | |
442 | goto nla_put_failure; | |
7af4cc3f | 443 | |
2c38de4c NC |
444 | if (indev && entskb->dev && |
445 | entskb->mac_header != entskb->network_header) { | |
7af4cc3f | 446 | struct nfqnl_msg_packet_hw phw; |
b95cce35 SH |
447 | int len = dev_parse_header(entskb, phw.hw_addr); |
448 | if (len) { | |
449 | phw.hw_addrlen = htons(len); | |
a447189e DM |
450 | if (nla_put(skb, NFQA_HWADDR, sizeof(phw), &phw)) |
451 | goto nla_put_failure; | |
b95cce35 | 452 | } |
7af4cc3f HW |
453 | } |
454 | ||
b7aa0bf7 | 455 | if (entskb->tstamp.tv64) { |
7af4cc3f | 456 | struct nfqnl_msg_packet_timestamp ts; |
b7aa0bf7 ED |
457 | struct timeval tv = ktime_to_timeval(entskb->tstamp); |
458 | ts.sec = cpu_to_be64(tv.tv_sec); | |
459 | ts.usec = cpu_to_be64(tv.tv_usec); | |
7af4cc3f | 460 | |
a447189e DM |
461 | if (nla_put(skb, NFQA_TIMESTAMP, sizeof(ts), &ts)) |
462 | goto nla_put_failure; | |
7af4cc3f HW |
463 | } |
464 | ||
ae08ce00 ED |
465 | if (ct && nfqnl_ct_put(skb, ct, ctinfo) < 0) |
466 | goto nla_put_failure; | |
467 | ||
468 | if (cap_len > 0 && nla_put_be32(skb, NFQA_CAP_LEN, htonl(cap_len))) | |
469 | goto nla_put_failure; | |
470 | ||
7237190d FW |
471 | if (nfqnl_put_packet_info(skb, entskb)) |
472 | goto nla_put_failure; | |
473 | ||
7af4cc3f | 474 | if (data_len) { |
df6fb868 | 475 | struct nlattr *nla; |
7af4cc3f | 476 | |
ae08ce00 ED |
477 | if (skb_tailroom(skb) < sizeof(*nla) + hlen) |
478 | goto nla_put_failure; | |
7af4cc3f | 479 | |
ae08ce00 | 480 | nla = (struct nlattr *)skb_put(skb, sizeof(*nla)); |
df6fb868 | 481 | nla->nla_type = NFQA_PAYLOAD; |
ae08ce00 | 482 | nla->nla_len = nla_attr_size(data_len); |
7af4cc3f | 483 | |
ae08ce00 | 484 | nfqnl_zcopy(skb, entskb, data_len, hlen); |
7af4cc3f | 485 | } |
601e68e1 | 486 | |
ae08ce00 | 487 | nlh->nlmsg_len = skb->len; |
7af4cc3f HW |
488 | return skb; |
489 | ||
df6fb868 | 490 | nla_put_failure: |
a6729955 | 491 | kfree_skb(skb); |
e87cc472 | 492 | net_err_ratelimited("nf_queue: error creating packet message\n"); |
7af4cc3f HW |
493 | return NULL; |
494 | } | |
495 | ||
496 | static int | |
a5fedd43 FW |
497 | __nfqnl_enqueue_packet(struct net *net, struct nfqnl_instance *queue, |
498 | struct nf_queue_entry *entry) | |
7af4cc3f | 499 | { |
7af4cc3f | 500 | struct sk_buff *nskb; |
f1585086 | 501 | int err = -ENOBUFS; |
5863702a | 502 | __be32 *packet_id_ptr; |
fdb694a0 | 503 | int failopen = 0; |
7af4cc3f | 504 | |
5863702a | 505 | nskb = nfqnl_build_packet_message(queue, entry, &packet_id_ptr); |
f1585086 FW |
506 | if (nskb == NULL) { |
507 | err = -ENOMEM; | |
0ef0f465 | 508 | goto err_out; |
f1585086 | 509 | } |
7af4cc3f | 510 | spin_lock_bh(&queue->lock); |
601e68e1 | 511 | |
15e47304 | 512 | if (!queue->peer_portid) { |
f1585086 | 513 | err = -EINVAL; |
601e68e1 | 514 | goto err_out_free_nskb; |
f1585086 | 515 | } |
7af4cc3f | 516 | if (queue->queue_total >= queue->queue_maxlen) { |
fdb694a0 KK |
517 | if (queue->flags & NFQA_CFG_F_FAIL_OPEN) { |
518 | failopen = 1; | |
519 | err = 0; | |
520 | } else { | |
521 | queue->queue_dropped++; | |
522 | net_warn_ratelimited("nf_queue: full at %d entries, dropping packets(s)\n", | |
523 | queue->queue_total); | |
524 | } | |
7af4cc3f HW |
525 | goto err_out_free_nskb; |
526 | } | |
5863702a ED |
527 | entry->id = ++queue->id_sequence; |
528 | *packet_id_ptr = htonl(entry->id); | |
7af4cc3f HW |
529 | |
530 | /* nfnetlink_unicast will either free the nskb or add it to a socket */ | |
e8179610 | 531 | err = nfnetlink_unicast(nskb, net, queue->peer_portid, MSG_DONTWAIT); |
0ef0f465 | 532 | if (err < 0) { |
601e68e1 | 533 | queue->queue_user_dropped++; |
7af4cc3f HW |
534 | goto err_out_unlock; |
535 | } | |
536 | ||
537 | __enqueue_entry(queue, entry); | |
538 | ||
539 | spin_unlock_bh(&queue->lock); | |
0ef0f465 | 540 | return 0; |
7af4cc3f HW |
541 | |
542 | err_out_free_nskb: | |
601e68e1 | 543 | kfree_skb(nskb); |
7af4cc3f HW |
544 | err_out_unlock: |
545 | spin_unlock_bh(&queue->lock); | |
fdb694a0 KK |
546 | if (failopen) |
547 | nf_reinject(entry, NF_ACCEPT); | |
0ef0f465 | 548 | err_out: |
f1585086 | 549 | return err; |
7af4cc3f HW |
550 | } |
551 | ||
a5fedd43 FW |
552 | static struct nf_queue_entry * |
553 | nf_queue_entry_dup(struct nf_queue_entry *e) | |
554 | { | |
555 | struct nf_queue_entry *entry = kmemdup(e, e->size, GFP_ATOMIC); | |
556 | if (entry) { | |
557 | if (nf_queue_entry_get_refs(entry)) | |
558 | return entry; | |
559 | kfree(entry); | |
560 | } | |
561 | return NULL; | |
562 | } | |
563 | ||
564 | #ifdef CONFIG_BRIDGE_NETFILTER | |
565 | /* When called from bridge netfilter, skb->data must point to MAC header | |
566 | * before calling skb_gso_segment(). Else, original MAC header is lost | |
567 | * and segmented skbs will be sent to wrong destination. | |
568 | */ | |
569 | static void nf_bridge_adjust_skb_data(struct sk_buff *skb) | |
570 | { | |
571 | if (skb->nf_bridge) | |
572 | __skb_push(skb, skb->network_header - skb->mac_header); | |
573 | } | |
574 | ||
575 | static void nf_bridge_adjust_segmented_data(struct sk_buff *skb) | |
576 | { | |
577 | if (skb->nf_bridge) | |
578 | __skb_pull(skb, skb->network_header - skb->mac_header); | |
579 | } | |
580 | #else | |
581 | #define nf_bridge_adjust_skb_data(s) do {} while (0) | |
582 | #define nf_bridge_adjust_segmented_data(s) do {} while (0) | |
583 | #endif | |
584 | ||
585 | static void free_entry(struct nf_queue_entry *entry) | |
586 | { | |
587 | nf_queue_entry_release_refs(entry); | |
588 | kfree(entry); | |
589 | } | |
590 | ||
591 | static int | |
592 | __nfqnl_enqueue_packet_gso(struct net *net, struct nfqnl_instance *queue, | |
593 | struct sk_buff *skb, struct nf_queue_entry *entry) | |
594 | { | |
595 | int ret = -ENOMEM; | |
596 | struct nf_queue_entry *entry_seg; | |
597 | ||
598 | nf_bridge_adjust_segmented_data(skb); | |
599 | ||
600 | if (skb->next == NULL) { /* last packet, no need to copy entry */ | |
601 | struct sk_buff *gso_skb = entry->skb; | |
602 | entry->skb = skb; | |
603 | ret = __nfqnl_enqueue_packet(net, queue, entry); | |
604 | if (ret) | |
605 | entry->skb = gso_skb; | |
606 | return ret; | |
607 | } | |
608 | ||
609 | skb->next = NULL; | |
610 | ||
611 | entry_seg = nf_queue_entry_dup(entry); | |
612 | if (entry_seg) { | |
613 | entry_seg->skb = skb; | |
614 | ret = __nfqnl_enqueue_packet(net, queue, entry_seg); | |
615 | if (ret) | |
616 | free_entry(entry_seg); | |
617 | } | |
618 | return ret; | |
619 | } | |
620 | ||
621 | static int | |
622 | nfqnl_enqueue_packet(struct nf_queue_entry *entry, unsigned int queuenum) | |
623 | { | |
624 | unsigned int queued; | |
625 | struct nfqnl_instance *queue; | |
626 | struct sk_buff *skb, *segs; | |
627 | int err = -ENOBUFS; | |
628 | struct net *net = dev_net(entry->indev ? | |
629 | entry->indev : entry->outdev); | |
630 | struct nfnl_queue_net *q = nfnl_queue_pernet(net); | |
631 | ||
632 | /* rcu_read_lock()ed by nf_hook_slow() */ | |
633 | queue = instance_lookup(q, queuenum); | |
634 | if (!queue) | |
635 | return -ESRCH; | |
636 | ||
637 | if (queue->copy_mode == NFQNL_COPY_NONE) | |
638 | return -EINVAL; | |
639 | ||
00bd1cc2 | 640 | if ((queue->flags & NFQA_CFG_F_GSO) || !skb_is_gso(entry->skb)) |
a5fedd43 FW |
641 | return __nfqnl_enqueue_packet(net, queue, entry); |
642 | ||
643 | skb = entry->skb; | |
644 | ||
645 | switch (entry->pf) { | |
646 | case NFPROTO_IPV4: | |
647 | skb->protocol = htons(ETH_P_IP); | |
648 | break; | |
649 | case NFPROTO_IPV6: | |
650 | skb->protocol = htons(ETH_P_IPV6); | |
651 | break; | |
652 | } | |
653 | ||
654 | nf_bridge_adjust_skb_data(skb); | |
655 | segs = skb_gso_segment(skb, 0); | |
656 | /* Does not use PTR_ERR to limit the number of error codes that can be | |
657 | * returned by nf_queue. For instance, callers rely on -ECANCELED to | |
658 | * mean 'ignore this hook'. | |
659 | */ | |
660 | if (IS_ERR(segs)) | |
661 | goto out_err; | |
662 | queued = 0; | |
663 | err = 0; | |
664 | do { | |
665 | struct sk_buff *nskb = segs->next; | |
666 | if (err == 0) | |
667 | err = __nfqnl_enqueue_packet_gso(net, queue, | |
668 | segs, entry); | |
669 | if (err == 0) | |
670 | queued++; | |
671 | else | |
672 | kfree_skb(segs); | |
673 | segs = nskb; | |
674 | } while (segs); | |
675 | ||
676 | if (queued) { | |
677 | if (err) /* some segments are already queued */ | |
678 | free_entry(entry); | |
679 | kfree_skb(skb); | |
680 | return 0; | |
681 | } | |
682 | out_err: | |
683 | nf_bridge_adjust_segmented_data(skb); | |
684 | return err; | |
685 | } | |
686 | ||
7af4cc3f | 687 | static int |
8c88f87c | 688 | nfqnl_mangle(void *data, int data_len, struct nf_queue_entry *e, int diff) |
7af4cc3f | 689 | { |
e2b58a67 | 690 | struct sk_buff *nskb; |
7af4cc3f | 691 | |
d8a585d7 PM |
692 | if (diff < 0) { |
693 | if (pskb_trim(e->skb, data_len)) | |
694 | return -ENOMEM; | |
695 | } else if (diff > 0) { | |
7af4cc3f HW |
696 | if (data_len > 0xFFFF) |
697 | return -EINVAL; | |
698 | if (diff > skb_tailroom(e->skb)) { | |
9a732ed6 AE |
699 | nskb = skb_copy_expand(e->skb, skb_headroom(e->skb), |
700 | diff, GFP_ATOMIC); | |
e2b58a67 | 701 | if (!nskb) { |
1158ba27 | 702 | printk(KERN_WARNING "nf_queue: OOM " |
7af4cc3f | 703 | "in mangle, dropping packet\n"); |
e2b58a67 | 704 | return -ENOMEM; |
7af4cc3f | 705 | } |
e2b58a67 PM |
706 | kfree_skb(e->skb); |
707 | e->skb = nskb; | |
7af4cc3f HW |
708 | } |
709 | skb_put(e->skb, diff); | |
710 | } | |
37d41879 | 711 | if (!skb_make_writable(e->skb, data_len)) |
7af4cc3f | 712 | return -ENOMEM; |
27d7ff46 | 713 | skb_copy_to_linear_data(e->skb, data, data_len); |
e7dfb09a | 714 | e->skb->ip_summed = CHECKSUM_NONE; |
7af4cc3f HW |
715 | return 0; |
716 | } | |
717 | ||
7af4cc3f HW |
718 | static int |
719 | nfqnl_set_mode(struct nfqnl_instance *queue, | |
720 | unsigned char mode, unsigned int range) | |
721 | { | |
c5de0dfd | 722 | int status = 0; |
7af4cc3f HW |
723 | |
724 | spin_lock_bh(&queue->lock); | |
c5de0dfd PM |
725 | switch (mode) { |
726 | case NFQNL_COPY_NONE: | |
727 | case NFQNL_COPY_META: | |
728 | queue->copy_mode = mode; | |
729 | queue->copy_range = 0; | |
730 | break; | |
731 | ||
732 | case NFQNL_COPY_PACKET: | |
733 | queue->copy_mode = mode; | |
ba8d3b0b PNA |
734 | /* We're using struct nlattr which has 16bit nla_len. Note that |
735 | * nla_len includes the header length. Thus, the maximum packet | |
736 | * length that we support is 65531 bytes. We send truncated | |
737 | * packets if the specified length is larger than that. | |
738 | */ | |
739 | if (range > 0xffff - NLA_HDRLEN) | |
740 | queue->copy_range = 0xffff - NLA_HDRLEN; | |
c5de0dfd PM |
741 | else |
742 | queue->copy_range = range; | |
743 | break; | |
744 | ||
745 | default: | |
746 | status = -EINVAL; | |
747 | ||
748 | } | |
7af4cc3f HW |
749 | spin_unlock_bh(&queue->lock); |
750 | ||
751 | return status; | |
752 | } | |
753 | ||
754 | static int | |
02f014d8 | 755 | dev_cmp(struct nf_queue_entry *entry, unsigned long ifindex) |
7af4cc3f | 756 | { |
02f014d8 PM |
757 | if (entry->indev) |
758 | if (entry->indev->ifindex == ifindex) | |
7af4cc3f | 759 | return 1; |
02f014d8 PM |
760 | if (entry->outdev) |
761 | if (entry->outdev->ifindex == ifindex) | |
7af4cc3f | 762 | return 1; |
ef47c6a7 PM |
763 | #ifdef CONFIG_BRIDGE_NETFILTER |
764 | if (entry->skb->nf_bridge) { | |
765 | if (entry->skb->nf_bridge->physindev && | |
766 | entry->skb->nf_bridge->physindev->ifindex == ifindex) | |
767 | return 1; | |
768 | if (entry->skb->nf_bridge->physoutdev && | |
769 | entry->skb->nf_bridge->physoutdev->ifindex == ifindex) | |
770 | return 1; | |
771 | } | |
772 | #endif | |
7af4cc3f HW |
773 | return 0; |
774 | } | |
775 | ||
776 | /* drop all packets with either indev or outdev == ifindex from all queue | |
777 | * instances */ | |
778 | static void | |
e8179610 | 779 | nfqnl_dev_drop(struct net *net, int ifindex) |
7af4cc3f HW |
780 | { |
781 | int i; | |
e8179610 | 782 | struct nfnl_queue_net *q = nfnl_queue_pernet(net); |
601e68e1 | 783 | |
9872bec7 | 784 | rcu_read_lock(); |
7af4cc3f | 785 | |
9872bec7 | 786 | for (i = 0; i < INSTANCE_BUCKETS; i++) { |
7af4cc3f | 787 | struct nfqnl_instance *inst; |
e8179610 | 788 | struct hlist_head *head = &q->instance_table[i]; |
7af4cc3f | 789 | |
b67bfe0d | 790 | hlist_for_each_entry_rcu(inst, head, hlist) |
b43d8d85 | 791 | nfqnl_flush(inst, dev_cmp, ifindex); |
7af4cc3f HW |
792 | } |
793 | ||
9872bec7 | 794 | rcu_read_unlock(); |
7af4cc3f HW |
795 | } |
796 | ||
797 | #define RCV_SKB_FAIL(err) do { netlink_ack(skb, nlh, (err)); return; } while (0) | |
798 | ||
799 | static int | |
800 | nfqnl_rcv_dev_event(struct notifier_block *this, | |
801 | unsigned long event, void *ptr) | |
802 | { | |
803 | struct net_device *dev = ptr; | |
804 | ||
805 | /* Drop any packets associated with the downed device */ | |
806 | if (event == NETDEV_DOWN) | |
e8179610 | 807 | nfqnl_dev_drop(dev_net(dev), dev->ifindex); |
7af4cc3f HW |
808 | return NOTIFY_DONE; |
809 | } | |
810 | ||
811 | static struct notifier_block nfqnl_dev_notifier = { | |
812 | .notifier_call = nfqnl_rcv_dev_event, | |
813 | }; | |
814 | ||
815 | static int | |
816 | nfqnl_rcv_nl_event(struct notifier_block *this, | |
817 | unsigned long event, void *ptr) | |
818 | { | |
819 | struct netlink_notify *n = ptr; | |
e8179610 | 820 | struct nfnl_queue_net *q = nfnl_queue_pernet(n->net); |
7af4cc3f | 821 | |
dee5817e | 822 | if (event == NETLINK_URELEASE && n->protocol == NETLINK_NETFILTER) { |
7af4cc3f HW |
823 | int i; |
824 | ||
15e47304 | 825 | /* destroy all instances for this portid */ |
e8179610 | 826 | spin_lock(&q->instances_lock); |
9872bec7 | 827 | for (i = 0; i < INSTANCE_BUCKETS; i++) { |
b67bfe0d | 828 | struct hlist_node *t2; |
7af4cc3f | 829 | struct nfqnl_instance *inst; |
e8179610 | 830 | struct hlist_head *head = &q->instance_table[i]; |
7af4cc3f | 831 | |
b67bfe0d | 832 | hlist_for_each_entry_safe(inst, t2, head, hlist) { |
e8179610 | 833 | if (n->portid == inst->peer_portid) |
7af4cc3f HW |
834 | __instance_destroy(inst); |
835 | } | |
836 | } | |
e8179610 | 837 | spin_unlock(&q->instances_lock); |
7af4cc3f HW |
838 | } |
839 | return NOTIFY_DONE; | |
840 | } | |
841 | ||
842 | static struct notifier_block nfqnl_rtnl_notifier = { | |
843 | .notifier_call = nfqnl_rcv_nl_event, | |
844 | }; | |
845 | ||
5bf75853 PM |
846 | static const struct nla_policy nfqa_verdict_policy[NFQA_MAX+1] = { |
847 | [NFQA_VERDICT_HDR] = { .len = sizeof(struct nfqnl_msg_verdict_hdr) }, | |
848 | [NFQA_MARK] = { .type = NLA_U32 }, | |
849 | [NFQA_PAYLOAD] = { .type = NLA_UNSPEC }, | |
9cb01766 | 850 | [NFQA_CT] = { .type = NLA_UNSPEC }, |
838ab636 HW |
851 | }; |
852 | ||
97d32cf9 FW |
853 | static const struct nla_policy nfqa_verdict_batch_policy[NFQA_MAX+1] = { |
854 | [NFQA_VERDICT_HDR] = { .len = sizeof(struct nfqnl_msg_verdict_hdr) }, | |
855 | [NFQA_MARK] = { .type = NLA_U32 }, | |
856 | }; | |
857 | ||
e8179610 G |
858 | static struct nfqnl_instance * |
859 | verdict_instance_lookup(struct nfnl_queue_net *q, u16 queue_num, int nlportid) | |
97d32cf9 FW |
860 | { |
861 | struct nfqnl_instance *queue; | |
862 | ||
e8179610 | 863 | queue = instance_lookup(q, queue_num); |
97d32cf9 FW |
864 | if (!queue) |
865 | return ERR_PTR(-ENODEV); | |
866 | ||
15e47304 | 867 | if (queue->peer_portid != nlportid) |
97d32cf9 FW |
868 | return ERR_PTR(-EPERM); |
869 | ||
870 | return queue; | |
871 | } | |
872 | ||
873 | static struct nfqnl_msg_verdict_hdr* | |
874 | verdicthdr_get(const struct nlattr * const nfqa[]) | |
875 | { | |
876 | struct nfqnl_msg_verdict_hdr *vhdr; | |
877 | unsigned int verdict; | |
878 | ||
879 | if (!nfqa[NFQA_VERDICT_HDR]) | |
880 | return NULL; | |
881 | ||
882 | vhdr = nla_data(nfqa[NFQA_VERDICT_HDR]); | |
c6675233 FW |
883 | verdict = ntohl(vhdr->verdict) & NF_VERDICT_MASK; |
884 | if (verdict > NF_MAX_VERDICT || verdict == NF_STOLEN) | |
97d32cf9 FW |
885 | return NULL; |
886 | return vhdr; | |
887 | } | |
888 | ||
889 | static int nfq_id_after(unsigned int id, unsigned int max) | |
890 | { | |
891 | return (int)(id - max) > 0; | |
892 | } | |
893 | ||
894 | static int | |
895 | nfqnl_recv_verdict_batch(struct sock *ctnl, struct sk_buff *skb, | |
896 | const struct nlmsghdr *nlh, | |
897 | const struct nlattr * const nfqa[]) | |
898 | { | |
3da07c0c | 899 | struct nfgenmsg *nfmsg = nlmsg_data(nlh); |
97d32cf9 FW |
900 | struct nf_queue_entry *entry, *tmp; |
901 | unsigned int verdict, maxid; | |
902 | struct nfqnl_msg_verdict_hdr *vhdr; | |
903 | struct nfqnl_instance *queue; | |
904 | LIST_HEAD(batch_list); | |
905 | u16 queue_num = ntohs(nfmsg->res_id); | |
906 | ||
e8179610 G |
907 | struct net *net = sock_net(ctnl); |
908 | struct nfnl_queue_net *q = nfnl_queue_pernet(net); | |
909 | ||
910 | queue = verdict_instance_lookup(q, queue_num, | |
911 | NETLINK_CB(skb).portid); | |
97d32cf9 FW |
912 | if (IS_ERR(queue)) |
913 | return PTR_ERR(queue); | |
914 | ||
915 | vhdr = verdicthdr_get(nfqa); | |
916 | if (!vhdr) | |
917 | return -EINVAL; | |
918 | ||
919 | verdict = ntohl(vhdr->verdict); | |
920 | maxid = ntohl(vhdr->id); | |
921 | ||
922 | spin_lock_bh(&queue->lock); | |
923 | ||
924 | list_for_each_entry_safe(entry, tmp, &queue->queue_list, list) { | |
925 | if (nfq_id_after(entry->id, maxid)) | |
926 | break; | |
927 | __dequeue_entry(queue, entry); | |
928 | list_add_tail(&entry->list, &batch_list); | |
929 | } | |
930 | ||
931 | spin_unlock_bh(&queue->lock); | |
932 | ||
933 | if (list_empty(&batch_list)) | |
934 | return -ENOENT; | |
935 | ||
936 | list_for_each_entry_safe(entry, tmp, &batch_list, list) { | |
937 | if (nfqa[NFQA_MARK]) | |
938 | entry->skb->mark = ntohl(nla_get_be32(nfqa[NFQA_MARK])); | |
939 | nf_reinject(entry, verdict); | |
940 | } | |
941 | return 0; | |
942 | } | |
943 | ||
7af4cc3f HW |
944 | static int |
945 | nfqnl_recv_verdict(struct sock *ctnl, struct sk_buff *skb, | |
39938324 PM |
946 | const struct nlmsghdr *nlh, |
947 | const struct nlattr * const nfqa[]) | |
7af4cc3f | 948 | { |
3da07c0c | 949 | struct nfgenmsg *nfmsg = nlmsg_data(nlh); |
7af4cc3f HW |
950 | u_int16_t queue_num = ntohs(nfmsg->res_id); |
951 | ||
952 | struct nfqnl_msg_verdict_hdr *vhdr; | |
953 | struct nfqnl_instance *queue; | |
954 | unsigned int verdict; | |
02f014d8 | 955 | struct nf_queue_entry *entry; |
8c88f87c PNA |
956 | enum ip_conntrack_info uninitialized_var(ctinfo); |
957 | struct nf_conn *ct = NULL; | |
7af4cc3f | 958 | |
e8179610 G |
959 | struct net *net = sock_net(ctnl); |
960 | struct nfnl_queue_net *q = nfnl_queue_pernet(net); | |
7af4cc3f | 961 | |
e8179610 G |
962 | queue = instance_lookup(q, queue_num); |
963 | if (!queue) | |
964 | queue = verdict_instance_lookup(q, queue_num, | |
965 | NETLINK_CB(skb).portid); | |
97d32cf9 FW |
966 | if (IS_ERR(queue)) |
967 | return PTR_ERR(queue); | |
7af4cc3f | 968 | |
97d32cf9 FW |
969 | vhdr = verdicthdr_get(nfqa); |
970 | if (!vhdr) | |
84a797dd | 971 | return -EINVAL; |
7af4cc3f | 972 | |
7af4cc3f HW |
973 | verdict = ntohl(vhdr->verdict); |
974 | ||
b43d8d85 | 975 | entry = find_dequeue_entry(queue, ntohl(vhdr->id)); |
84a797dd ED |
976 | if (entry == NULL) |
977 | return -ENOENT; | |
7af4cc3f | 978 | |
9cb01766 | 979 | rcu_read_lock(); |
7c622345 PNA |
980 | if (nfqa[NFQA_CT] && (queue->flags & NFQA_CFG_F_CONNTRACK)) |
981 | ct = nfqnl_ct_parse(entry->skb, nfqa[NFQA_CT], &ctinfo); | |
9cb01766 | 982 | |
df6fb868 | 983 | if (nfqa[NFQA_PAYLOAD]) { |
8c88f87c PNA |
984 | u16 payload_len = nla_len(nfqa[NFQA_PAYLOAD]); |
985 | int diff = payload_len - entry->skb->len; | |
986 | ||
df6fb868 | 987 | if (nfqnl_mangle(nla_data(nfqa[NFQA_PAYLOAD]), |
8c88f87c | 988 | payload_len, entry, diff) < 0) |
7af4cc3f | 989 | verdict = NF_DROP; |
8c88f87c | 990 | |
7c622345 PNA |
991 | if (ct) |
992 | nfqnl_ct_seq_adjust(skb, ct, ctinfo, diff); | |
7af4cc3f | 993 | } |
8c88f87c | 994 | rcu_read_unlock(); |
7af4cc3f | 995 | |
df6fb868 | 996 | if (nfqa[NFQA_MARK]) |
ea3a66ff | 997 | entry->skb->mark = ntohl(nla_get_be32(nfqa[NFQA_MARK])); |
601e68e1 | 998 | |
4b3d15ef | 999 | nf_reinject(entry, verdict); |
7af4cc3f HW |
1000 | return 0; |
1001 | } | |
1002 | ||
1003 | static int | |
1004 | nfqnl_recv_unsupp(struct sock *ctnl, struct sk_buff *skb, | |
39938324 PM |
1005 | const struct nlmsghdr *nlh, |
1006 | const struct nlattr * const nfqa[]) | |
7af4cc3f HW |
1007 | { |
1008 | return -ENOTSUPP; | |
1009 | } | |
1010 | ||
5bf75853 PM |
1011 | static const struct nla_policy nfqa_cfg_policy[NFQA_CFG_MAX+1] = { |
1012 | [NFQA_CFG_CMD] = { .len = sizeof(struct nfqnl_msg_config_cmd) }, | |
1013 | [NFQA_CFG_PARAMS] = { .len = sizeof(struct nfqnl_msg_config_params) }, | |
838ab636 HW |
1014 | }; |
1015 | ||
e3ac5298 | 1016 | static const struct nf_queue_handler nfqh = { |
bbd86b9f HW |
1017 | .outfn = &nfqnl_enqueue_packet, |
1018 | }; | |
1019 | ||
7af4cc3f HW |
1020 | static int |
1021 | nfqnl_recv_config(struct sock *ctnl, struct sk_buff *skb, | |
39938324 PM |
1022 | const struct nlmsghdr *nlh, |
1023 | const struct nlattr * const nfqa[]) | |
7af4cc3f | 1024 | { |
3da07c0c | 1025 | struct nfgenmsg *nfmsg = nlmsg_data(nlh); |
7af4cc3f HW |
1026 | u_int16_t queue_num = ntohs(nfmsg->res_id); |
1027 | struct nfqnl_instance *queue; | |
9872bec7 | 1028 | struct nfqnl_msg_config_cmd *cmd = NULL; |
e8179610 G |
1029 | struct net *net = sock_net(ctnl); |
1030 | struct nfnl_queue_net *q = nfnl_queue_pernet(net); | |
838ab636 | 1031 | int ret = 0; |
7af4cc3f | 1032 | |
9872bec7 PM |
1033 | if (nfqa[NFQA_CFG_CMD]) { |
1034 | cmd = nla_data(nfqa[NFQA_CFG_CMD]); | |
1035 | ||
0360ae41 | 1036 | /* Obsolete commands without queue context */ |
9872bec7 | 1037 | switch (cmd->command) { |
0360ae41 FW |
1038 | case NFQNL_CFG_CMD_PF_BIND: return 0; |
1039 | case NFQNL_CFG_CMD_PF_UNBIND: return 0; | |
9872bec7 | 1040 | } |
9872bec7 PM |
1041 | } |
1042 | ||
1043 | rcu_read_lock(); | |
e8179610 | 1044 | queue = instance_lookup(q, queue_num); |
15e47304 | 1045 | if (queue && queue->peer_portid != NETLINK_CB(skb).portid) { |
a3c8e7fd | 1046 | ret = -EPERM; |
9872bec7 | 1047 | goto err_out_unlock; |
a3c8e7fd PM |
1048 | } |
1049 | ||
9872bec7 | 1050 | if (cmd != NULL) { |
7af4cc3f HW |
1051 | switch (cmd->command) { |
1052 | case NFQNL_CFG_CMD_BIND: | |
9872bec7 PM |
1053 | if (queue) { |
1054 | ret = -EBUSY; | |
1055 | goto err_out_unlock; | |
1056 | } | |
e8179610 G |
1057 | queue = instance_create(q, queue_num, |
1058 | NETLINK_CB(skb).portid); | |
baab2ce7 PM |
1059 | if (IS_ERR(queue)) { |
1060 | ret = PTR_ERR(queue); | |
9872bec7 PM |
1061 | goto err_out_unlock; |
1062 | } | |
7af4cc3f HW |
1063 | break; |
1064 | case NFQNL_CFG_CMD_UNBIND: | |
9872bec7 PM |
1065 | if (!queue) { |
1066 | ret = -ENODEV; | |
1067 | goto err_out_unlock; | |
1068 | } | |
e8179610 | 1069 | instance_destroy(q, queue); |
7af4cc3f HW |
1070 | break; |
1071 | case NFQNL_CFG_CMD_PF_BIND: | |
7af4cc3f | 1072 | case NFQNL_CFG_CMD_PF_UNBIND: |
7af4cc3f HW |
1073 | break; |
1074 | default: | |
cd21f0ac | 1075 | ret = -ENOTSUPP; |
838ab636 | 1076 | break; |
7af4cc3f | 1077 | } |
7af4cc3f HW |
1078 | } |
1079 | ||
df6fb868 | 1080 | if (nfqa[NFQA_CFG_PARAMS]) { |
7af4cc3f | 1081 | struct nfqnl_msg_config_params *params; |
7af4cc3f | 1082 | |
406dbfc9 | 1083 | if (!queue) { |
a3c8e7fd | 1084 | ret = -ENODEV; |
9872bec7 | 1085 | goto err_out_unlock; |
406dbfc9 | 1086 | } |
df6fb868 | 1087 | params = nla_data(nfqa[NFQA_CFG_PARAMS]); |
7af4cc3f HW |
1088 | nfqnl_set_mode(queue, params->copy_mode, |
1089 | ntohl(params->copy_range)); | |
1090 | } | |
1091 | ||
df6fb868 | 1092 | if (nfqa[NFQA_CFG_QUEUE_MAXLEN]) { |
829e17a1 | 1093 | __be32 *queue_maxlen; |
a3c8e7fd PM |
1094 | |
1095 | if (!queue) { | |
1096 | ret = -ENODEV; | |
9872bec7 | 1097 | goto err_out_unlock; |
a3c8e7fd | 1098 | } |
df6fb868 | 1099 | queue_maxlen = nla_data(nfqa[NFQA_CFG_QUEUE_MAXLEN]); |
829e17a1 EL |
1100 | spin_lock_bh(&queue->lock); |
1101 | queue->queue_maxlen = ntohl(*queue_maxlen); | |
1102 | spin_unlock_bh(&queue->lock); | |
1103 | } | |
1104 | ||
fdb694a0 KK |
1105 | if (nfqa[NFQA_CFG_FLAGS]) { |
1106 | __u32 flags, mask; | |
1107 | ||
1108 | if (!queue) { | |
1109 | ret = -ENODEV; | |
1110 | goto err_out_unlock; | |
1111 | } | |
1112 | ||
1113 | if (!nfqa[NFQA_CFG_MASK]) { | |
1114 | /* A mask is needed to specify which flags are being | |
1115 | * changed. | |
1116 | */ | |
1117 | ret = -EINVAL; | |
1118 | goto err_out_unlock; | |
1119 | } | |
1120 | ||
1121 | flags = ntohl(nla_get_be32(nfqa[NFQA_CFG_FLAGS])); | |
1122 | mask = ntohl(nla_get_be32(nfqa[NFQA_CFG_MASK])); | |
1123 | ||
46ba5a25 KK |
1124 | if (flags >= NFQA_CFG_F_MAX) { |
1125 | ret = -EOPNOTSUPP; | |
1126 | goto err_out_unlock; | |
1127 | } | |
1128 | ||
fdb694a0 KK |
1129 | spin_lock_bh(&queue->lock); |
1130 | queue->flags &= ~mask; | |
1131 | queue->flags |= flags & mask; | |
1132 | spin_unlock_bh(&queue->lock); | |
1133 | } | |
1134 | ||
9872bec7 PM |
1135 | err_out_unlock: |
1136 | rcu_read_unlock(); | |
838ab636 | 1137 | return ret; |
7af4cc3f HW |
1138 | } |
1139 | ||
7c8d4cb4 | 1140 | static const struct nfnl_callback nfqnl_cb[NFQNL_MSG_MAX] = { |
84a797dd | 1141 | [NFQNL_MSG_PACKET] = { .call_rcu = nfqnl_recv_unsupp, |
37d2e7a2 | 1142 | .attr_count = NFQA_MAX, }, |
84a797dd | 1143 | [NFQNL_MSG_VERDICT] = { .call_rcu = nfqnl_recv_verdict, |
5bf75853 PM |
1144 | .attr_count = NFQA_MAX, |
1145 | .policy = nfqa_verdict_policy }, | |
7af4cc3f | 1146 | [NFQNL_MSG_CONFIG] = { .call = nfqnl_recv_config, |
5bf75853 PM |
1147 | .attr_count = NFQA_CFG_MAX, |
1148 | .policy = nfqa_cfg_policy }, | |
97d32cf9 FW |
1149 | [NFQNL_MSG_VERDICT_BATCH]={ .call_rcu = nfqnl_recv_verdict_batch, |
1150 | .attr_count = NFQA_MAX, | |
1151 | .policy = nfqa_verdict_batch_policy }, | |
7af4cc3f HW |
1152 | }; |
1153 | ||
7c8d4cb4 | 1154 | static const struct nfnetlink_subsystem nfqnl_subsys = { |
7af4cc3f HW |
1155 | .name = "nf_queue", |
1156 | .subsys_id = NFNL_SUBSYS_QUEUE, | |
1157 | .cb_count = NFQNL_MSG_MAX, | |
7af4cc3f HW |
1158 | .cb = nfqnl_cb, |
1159 | }; | |
1160 | ||
838ab636 HW |
1161 | #ifdef CONFIG_PROC_FS |
1162 | struct iter_state { | |
e8179610 | 1163 | struct seq_net_private p; |
838ab636 HW |
1164 | unsigned int bucket; |
1165 | }; | |
1166 | ||
1167 | static struct hlist_node *get_first(struct seq_file *seq) | |
1168 | { | |
1169 | struct iter_state *st = seq->private; | |
e8179610 G |
1170 | struct net *net; |
1171 | struct nfnl_queue_net *q; | |
838ab636 HW |
1172 | |
1173 | if (!st) | |
1174 | return NULL; | |
1175 | ||
e8179610 G |
1176 | net = seq_file_net(seq); |
1177 | q = nfnl_queue_pernet(net); | |
838ab636 | 1178 | for (st->bucket = 0; st->bucket < INSTANCE_BUCKETS; st->bucket++) { |
e8179610 G |
1179 | if (!hlist_empty(&q->instance_table[st->bucket])) |
1180 | return q->instance_table[st->bucket].first; | |
838ab636 HW |
1181 | } |
1182 | return NULL; | |
1183 | } | |
1184 | ||
1185 | static struct hlist_node *get_next(struct seq_file *seq, struct hlist_node *h) | |
1186 | { | |
1187 | struct iter_state *st = seq->private; | |
e8179610 | 1188 | struct net *net = seq_file_net(seq); |
838ab636 HW |
1189 | |
1190 | h = h->next; | |
1191 | while (!h) { | |
e8179610 G |
1192 | struct nfnl_queue_net *q; |
1193 | ||
838ab636 HW |
1194 | if (++st->bucket >= INSTANCE_BUCKETS) |
1195 | return NULL; | |
1196 | ||
e8179610 G |
1197 | q = nfnl_queue_pernet(net); |
1198 | h = q->instance_table[st->bucket].first; | |
838ab636 HW |
1199 | } |
1200 | return h; | |
1201 | } | |
1202 | ||
1203 | static struct hlist_node *get_idx(struct seq_file *seq, loff_t pos) | |
1204 | { | |
1205 | struct hlist_node *head; | |
1206 | head = get_first(seq); | |
1207 | ||
1208 | if (head) | |
1209 | while (pos && (head = get_next(seq, head))) | |
1210 | pos--; | |
1211 | return pos ? NULL : head; | |
1212 | } | |
1213 | ||
e8179610 G |
1214 | static void *seq_start(struct seq_file *s, loff_t *pos) |
1215 | __acquires(nfnl_queue_pernet(seq_file_net(s))->instances_lock) | |
838ab636 | 1216 | { |
e8179610 G |
1217 | spin_lock(&nfnl_queue_pernet(seq_file_net(s))->instances_lock); |
1218 | return get_idx(s, *pos); | |
838ab636 HW |
1219 | } |
1220 | ||
1221 | static void *seq_next(struct seq_file *s, void *v, loff_t *pos) | |
1222 | { | |
1223 | (*pos)++; | |
1224 | return get_next(s, v); | |
1225 | } | |
1226 | ||
1227 | static void seq_stop(struct seq_file *s, void *v) | |
e8179610 | 1228 | __releases(nfnl_queue_pernet(seq_file_net(s))->instances_lock) |
838ab636 | 1229 | { |
e8179610 | 1230 | spin_unlock(&nfnl_queue_pernet(seq_file_net(s))->instances_lock); |
838ab636 HW |
1231 | } |
1232 | ||
1233 | static int seq_show(struct seq_file *s, void *v) | |
1234 | { | |
1235 | const struct nfqnl_instance *inst = v; | |
1236 | ||
1237 | return seq_printf(s, "%5d %6d %5d %1d %5d %5d %5d %8d %2d\n", | |
1238 | inst->queue_num, | |
15e47304 | 1239 | inst->peer_portid, inst->queue_total, |
838ab636 HW |
1240 | inst->copy_mode, inst->copy_range, |
1241 | inst->queue_dropped, inst->queue_user_dropped, | |
5863702a | 1242 | inst->id_sequence, 1); |
838ab636 HW |
1243 | } |
1244 | ||
56b3d975 | 1245 | static const struct seq_operations nfqnl_seq_ops = { |
838ab636 HW |
1246 | .start = seq_start, |
1247 | .next = seq_next, | |
1248 | .stop = seq_stop, | |
1249 | .show = seq_show, | |
1250 | }; | |
1251 | ||
1252 | static int nfqnl_open(struct inode *inode, struct file *file) | |
1253 | { | |
e8179610 | 1254 | return seq_open_net(inode, file, &nfqnl_seq_ops, |
e2da5913 | 1255 | sizeof(struct iter_state)); |
838ab636 HW |
1256 | } |
1257 | ||
da7071d7 | 1258 | static const struct file_operations nfqnl_file_ops = { |
838ab636 HW |
1259 | .owner = THIS_MODULE, |
1260 | .open = nfqnl_open, | |
1261 | .read = seq_read, | |
1262 | .llseek = seq_lseek, | |
e8179610 | 1263 | .release = seq_release_net, |
838ab636 HW |
1264 | }; |
1265 | ||
1266 | #endif /* PROC_FS */ | |
1267 | ||
e8179610 | 1268 | static int __net_init nfnl_queue_net_init(struct net *net) |
7af4cc3f | 1269 | { |
e8179610 G |
1270 | unsigned int i; |
1271 | struct nfnl_queue_net *q = nfnl_queue_pernet(net); | |
601e68e1 | 1272 | |
838ab636 | 1273 | for (i = 0; i < INSTANCE_BUCKETS; i++) |
e8179610 G |
1274 | INIT_HLIST_HEAD(&q->instance_table[i]); |
1275 | ||
1276 | spin_lock_init(&q->instances_lock); | |
1277 | ||
1278 | #ifdef CONFIG_PROC_FS | |
1279 | if (!proc_create("nfnetlink_queue", 0440, | |
1280 | net->nf.proc_netfilter, &nfqnl_file_ops)) | |
1281 | return -ENOMEM; | |
1282 | #endif | |
1283 | return 0; | |
1284 | } | |
1285 | ||
1286 | static void __net_exit nfnl_queue_net_exit(struct net *net) | |
1287 | { | |
1288 | remove_proc_entry("nfnetlink_queue", net->nf.proc_netfilter); | |
1289 | } | |
1290 | ||
1291 | static struct pernet_operations nfnl_queue_net_ops = { | |
1292 | .init = nfnl_queue_net_init, | |
1293 | .exit = nfnl_queue_net_exit, | |
1294 | .id = &nfnl_queue_net_id, | |
1295 | .size = sizeof(struct nfnl_queue_net), | |
1296 | }; | |
1297 | ||
1298 | static int __init nfnetlink_queue_init(void) | |
1299 | { | |
1300 | int status = -ENOMEM; | |
838ab636 | 1301 | |
7af4cc3f HW |
1302 | netlink_register_notifier(&nfqnl_rtnl_notifier); |
1303 | status = nfnetlink_subsys_register(&nfqnl_subsys); | |
1304 | if (status < 0) { | |
e8179610 | 1305 | pr_err("nf_queue: failed to create netlink socket\n"); |
7af4cc3f HW |
1306 | goto cleanup_netlink_notifier; |
1307 | } | |
1308 | ||
e8179610 G |
1309 | status = register_pernet_subsys(&nfnl_queue_net_ops); |
1310 | if (status < 0) { | |
1311 | pr_err("nf_queue: failed to register pernet ops\n"); | |
838ab636 | 1312 | goto cleanup_subsys; |
e8179610 | 1313 | } |
7af4cc3f | 1314 | register_netdevice_notifier(&nfqnl_dev_notifier); |
0360ae41 | 1315 | nf_register_queue_handler(&nfqh); |
7af4cc3f HW |
1316 | return status; |
1317 | ||
838ab636 | 1318 | cleanup_subsys: |
7af4cc3f | 1319 | nfnetlink_subsys_unregister(&nfqnl_subsys); |
7af4cc3f HW |
1320 | cleanup_netlink_notifier: |
1321 | netlink_unregister_notifier(&nfqnl_rtnl_notifier); | |
1322 | return status; | |
1323 | } | |
1324 | ||
65b4b4e8 | 1325 | static void __exit nfnetlink_queue_fini(void) |
7af4cc3f | 1326 | { |
0360ae41 | 1327 | nf_unregister_queue_handler(); |
32292a7f | 1328 | unregister_netdevice_notifier(&nfqnl_dev_notifier); |
e8179610 | 1329 | unregister_pernet_subsys(&nfnl_queue_net_ops); |
32292a7f PM |
1330 | nfnetlink_subsys_unregister(&nfqnl_subsys); |
1331 | netlink_unregister_notifier(&nfqnl_rtnl_notifier); | |
67137f3c JDB |
1332 | |
1333 | rcu_barrier(); /* Wait for completion of call_rcu()'s */ | |
7af4cc3f HW |
1334 | } |
1335 | ||
1336 | MODULE_DESCRIPTION("netfilter packet queue handler"); | |
1337 | MODULE_AUTHOR("Harald Welte <laforge@netfilter.org>"); | |
1338 | MODULE_LICENSE("GPL"); | |
1339 | MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_QUEUE); | |
1340 | ||
65b4b4e8 AM |
1341 | module_init(nfnetlink_queue_init); |
1342 | module_exit(nfnetlink_queue_fini); |