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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 | ||
9cefbbc9 FW |
44 | /* We're using struct nlattr which has 16bit nla_len. Note that nla_len |
45 | * includes the header length. Thus, the maximum packet length that we | |
46 | * support is 65531 bytes. We send truncated packets if the specified length | |
47 | * is larger than that. Userspace can check for presence of NFQA_CAP_LEN | |
48 | * attribute to detect truncation. | |
49 | */ | |
50 | #define NFQNL_MAX_COPY_RANGE (0xffff - NLA_HDRLEN) | |
51 | ||
7af4cc3f HW |
52 | struct nfqnl_instance { |
53 | struct hlist_node hlist; /* global list of queues */ | |
9872bec7 | 54 | struct rcu_head rcu; |
7af4cc3f | 55 | |
15e47304 | 56 | int peer_portid; |
7af4cc3f HW |
57 | unsigned int queue_maxlen; |
58 | unsigned int copy_range; | |
7af4cc3f HW |
59 | unsigned int queue_dropped; |
60 | unsigned int queue_user_dropped; | |
61 | ||
7af4cc3f HW |
62 | |
63 | u_int16_t queue_num; /* number of this queue */ | |
64 | u_int8_t copy_mode; | |
fdb694a0 | 65 | u_int32_t flags; /* Set using NFQA_CFG_FLAGS */ |
c463ac97 ED |
66 | /* |
67 | * Following fields are dirtied for each queued packet, | |
68 | * keep them in same cache line if possible. | |
69 | */ | |
70 | spinlock_t lock; | |
71 | unsigned int queue_total; | |
5863702a | 72 | unsigned int id_sequence; /* 'sequence' of pkt ids */ |
7af4cc3f HW |
73 | struct list_head queue_list; /* packets in queue */ |
74 | }; | |
75 | ||
02f014d8 | 76 | typedef int (*nfqnl_cmpfn)(struct nf_queue_entry *, unsigned long); |
7af4cc3f | 77 | |
e8179610 | 78 | static int nfnl_queue_net_id __read_mostly; |
7af4cc3f | 79 | |
7af4cc3f | 80 | #define INSTANCE_BUCKETS 16 |
e8179610 G |
81 | struct nfnl_queue_net { |
82 | spinlock_t instances_lock; | |
83 | struct hlist_head instance_table[INSTANCE_BUCKETS]; | |
84 | }; | |
85 | ||
86 | static struct nfnl_queue_net *nfnl_queue_pernet(struct net *net) | |
87 | { | |
88 | return net_generic(net, nfnl_queue_net_id); | |
89 | } | |
7af4cc3f HW |
90 | |
91 | static inline u_int8_t instance_hashfn(u_int16_t queue_num) | |
92 | { | |
1cdb0905 | 93 | return ((queue_num >> 8) ^ queue_num) % INSTANCE_BUCKETS; |
7af4cc3f HW |
94 | } |
95 | ||
96 | static struct nfqnl_instance * | |
e8179610 | 97 | instance_lookup(struct nfnl_queue_net *q, u_int16_t queue_num) |
7af4cc3f HW |
98 | { |
99 | struct hlist_head *head; | |
7af4cc3f HW |
100 | struct nfqnl_instance *inst; |
101 | ||
e8179610 | 102 | head = &q->instance_table[instance_hashfn(queue_num)]; |
b67bfe0d | 103 | hlist_for_each_entry_rcu(inst, head, hlist) { |
7af4cc3f HW |
104 | if (inst->queue_num == queue_num) |
105 | return inst; | |
106 | } | |
107 | return NULL; | |
108 | } | |
109 | ||
7af4cc3f | 110 | static struct nfqnl_instance * |
e8179610 G |
111 | instance_create(struct nfnl_queue_net *q, u_int16_t queue_num, |
112 | int portid) | |
7af4cc3f | 113 | { |
baab2ce7 | 114 | struct nfqnl_instance *inst; |
9872bec7 | 115 | unsigned int h; |
baab2ce7 | 116 | int err; |
7af4cc3f | 117 | |
e8179610 G |
118 | spin_lock(&q->instances_lock); |
119 | if (instance_lookup(q, queue_num)) { | |
baab2ce7 | 120 | err = -EEXIST; |
7af4cc3f | 121 | goto out_unlock; |
baab2ce7 | 122 | } |
7af4cc3f | 123 | |
10dfdc69 | 124 | inst = kzalloc(sizeof(*inst), GFP_ATOMIC); |
baab2ce7 PM |
125 | if (!inst) { |
126 | err = -ENOMEM; | |
7af4cc3f | 127 | goto out_unlock; |
baab2ce7 | 128 | } |
7af4cc3f | 129 | |
7af4cc3f | 130 | inst->queue_num = queue_num; |
15e47304 | 131 | inst->peer_portid = portid; |
7af4cc3f | 132 | inst->queue_maxlen = NFQNL_QMAX_DEFAULT; |
9cefbbc9 | 133 | inst->copy_range = NFQNL_MAX_COPY_RANGE; |
7af4cc3f | 134 | inst->copy_mode = NFQNL_COPY_NONE; |
181a46a5 | 135 | spin_lock_init(&inst->lock); |
7af4cc3f HW |
136 | INIT_LIST_HEAD(&inst->queue_list); |
137 | ||
baab2ce7 PM |
138 | if (!try_module_get(THIS_MODULE)) { |
139 | err = -EAGAIN; | |
7af4cc3f | 140 | goto out_free; |
baab2ce7 | 141 | } |
7af4cc3f | 142 | |
9872bec7 | 143 | h = instance_hashfn(queue_num); |
e8179610 | 144 | hlist_add_head_rcu(&inst->hlist, &q->instance_table[h]); |
7af4cc3f | 145 | |
e8179610 | 146 | spin_unlock(&q->instances_lock); |
7af4cc3f | 147 | |
7af4cc3f HW |
148 | return inst; |
149 | ||
150 | out_free: | |
151 | kfree(inst); | |
152 | out_unlock: | |
e8179610 | 153 | spin_unlock(&q->instances_lock); |
baab2ce7 | 154 | return ERR_PTR(err); |
7af4cc3f HW |
155 | } |
156 | ||
b43d8d85 PM |
157 | static void nfqnl_flush(struct nfqnl_instance *queue, nfqnl_cmpfn cmpfn, |
158 | unsigned long data); | |
7af4cc3f HW |
159 | |
160 | static void | |
9872bec7 | 161 | instance_destroy_rcu(struct rcu_head *head) |
7af4cc3f | 162 | { |
9872bec7 PM |
163 | struct nfqnl_instance *inst = container_of(head, struct nfqnl_instance, |
164 | rcu); | |
7af4cc3f | 165 | |
b43d8d85 | 166 | nfqnl_flush(inst, NULL, 0); |
9872bec7 | 167 | kfree(inst); |
7af4cc3f HW |
168 | module_put(THIS_MODULE); |
169 | } | |
170 | ||
9872bec7 | 171 | static void |
7af4cc3f HW |
172 | __instance_destroy(struct nfqnl_instance *inst) |
173 | { | |
9872bec7 PM |
174 | hlist_del_rcu(&inst->hlist); |
175 | call_rcu(&inst->rcu, instance_destroy_rcu); | |
7af4cc3f HW |
176 | } |
177 | ||
9872bec7 | 178 | static void |
e8179610 | 179 | instance_destroy(struct nfnl_queue_net *q, struct nfqnl_instance *inst) |
7af4cc3f | 180 | { |
e8179610 | 181 | spin_lock(&q->instances_lock); |
9872bec7 | 182 | __instance_destroy(inst); |
e8179610 | 183 | spin_unlock(&q->instances_lock); |
7af4cc3f HW |
184 | } |
185 | ||
7af4cc3f | 186 | static inline void |
02f014d8 | 187 | __enqueue_entry(struct nfqnl_instance *queue, struct nf_queue_entry *entry) |
7af4cc3f | 188 | { |
0ac41e81 | 189 | list_add_tail(&entry->list, &queue->queue_list); |
7af4cc3f HW |
190 | queue->queue_total++; |
191 | } | |
192 | ||
97d32cf9 FW |
193 | static void |
194 | __dequeue_entry(struct nfqnl_instance *queue, struct nf_queue_entry *entry) | |
195 | { | |
196 | list_del(&entry->list); | |
197 | queue->queue_total--; | |
198 | } | |
199 | ||
02f014d8 | 200 | static struct nf_queue_entry * |
b43d8d85 | 201 | find_dequeue_entry(struct nfqnl_instance *queue, unsigned int id) |
7af4cc3f | 202 | { |
02f014d8 | 203 | struct nf_queue_entry *entry = NULL, *i; |
601e68e1 | 204 | |
7af4cc3f | 205 | spin_lock_bh(&queue->lock); |
b43d8d85 PM |
206 | |
207 | list_for_each_entry(i, &queue->queue_list, list) { | |
208 | if (i->id == id) { | |
209 | entry = i; | |
210 | break; | |
211 | } | |
212 | } | |
213 | ||
97d32cf9 FW |
214 | if (entry) |
215 | __dequeue_entry(queue, entry); | |
b43d8d85 | 216 | |
7af4cc3f HW |
217 | spin_unlock_bh(&queue->lock); |
218 | ||
219 | return entry; | |
220 | } | |
221 | ||
222 | static void | |
b43d8d85 | 223 | nfqnl_flush(struct nfqnl_instance *queue, nfqnl_cmpfn cmpfn, unsigned long data) |
7af4cc3f | 224 | { |
02f014d8 | 225 | struct nf_queue_entry *entry, *next; |
b43d8d85 | 226 | |
7af4cc3f | 227 | spin_lock_bh(&queue->lock); |
b43d8d85 PM |
228 | list_for_each_entry_safe(entry, next, &queue->queue_list, list) { |
229 | if (!cmpfn || cmpfn(entry, data)) { | |
230 | list_del(&entry->list); | |
231 | queue->queue_total--; | |
4b3d15ef | 232 | nf_reinject(entry, NF_DROP); |
b43d8d85 PM |
233 | } |
234 | } | |
7af4cc3f HW |
235 | spin_unlock_bh(&queue->lock); |
236 | } | |
237 | ||
ae08ce00 ED |
238 | static void |
239 | nfqnl_zcopy(struct sk_buff *to, const struct sk_buff *from, int len, int hlen) | |
240 | { | |
241 | int i, j = 0; | |
242 | int plen = 0; /* length of skb->head fragment */ | |
243 | struct page *page; | |
244 | unsigned int offset; | |
245 | ||
246 | /* dont bother with small payloads */ | |
247 | if (len <= skb_tailroom(to)) { | |
248 | skb_copy_bits(from, 0, skb_put(to, len), len); | |
249 | return; | |
250 | } | |
251 | ||
252 | if (hlen) { | |
253 | skb_copy_bits(from, 0, skb_put(to, hlen), hlen); | |
254 | len -= hlen; | |
255 | } else { | |
256 | plen = min_t(int, skb_headlen(from), len); | |
257 | if (plen) { | |
258 | page = virt_to_head_page(from->head); | |
259 | offset = from->data - (unsigned char *)page_address(page); | |
260 | __skb_fill_page_desc(to, 0, page, offset, plen); | |
261 | get_page(page); | |
262 | j = 1; | |
263 | len -= plen; | |
264 | } | |
265 | } | |
266 | ||
267 | to->truesize += len + plen; | |
268 | to->len += len + plen; | |
269 | to->data_len += len + plen; | |
270 | ||
271 | for (i = 0; i < skb_shinfo(from)->nr_frags; i++) { | |
272 | if (!len) | |
273 | break; | |
274 | skb_shinfo(to)->frags[j] = skb_shinfo(from)->frags[i]; | |
275 | skb_shinfo(to)->frags[j].size = min_t(int, skb_shinfo(to)->frags[j].size, len); | |
276 | len -= skb_shinfo(to)->frags[j].size; | |
277 | skb_frag_ref(to, j); | |
278 | j++; | |
279 | } | |
280 | skb_shinfo(to)->nr_frags = j; | |
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); | |
9cefbbc9 | 344 | if (data_len > entskb->len) |
3e4ead4f | 345 | data_len = entskb->len; |
601e68e1 | 346 | |
ae08ce00 ED |
347 | if (!entskb->head_frag || |
348 | skb_headlen(entskb) < L1_CACHE_BYTES || | |
349 | skb_shinfo(entskb)->nr_frags >= MAX_SKB_FRAGS) | |
350 | hlen = skb_headlen(entskb); | |
351 | ||
352 | if (skb_has_frag_list(entskb)) | |
353 | hlen = entskb->len; | |
354 | hlen = min_t(int, data_len, hlen); | |
355 | size += sizeof(struct nlattr) + hlen; | |
6ee584be | 356 | cap_len = entskb->len; |
7af4cc3f | 357 | break; |
7af4cc3f HW |
358 | } |
359 | ||
7c622345 PNA |
360 | if (queue->flags & NFQA_CFG_F_CONNTRACK) |
361 | ct = nfqnl_ct_get(entskb, &size, &ctinfo); | |
7af4cc3f | 362 | |
3ab1f683 PM |
363 | skb = nfnetlink_alloc_skb(&init_net, size, queue->peer_portid, |
364 | GFP_ATOMIC); | |
7af4cc3f | 365 | if (!skb) |
3da07c0c | 366 | return NULL; |
601e68e1 | 367 | |
3da07c0c | 368 | nlh = nlmsg_put(skb, 0, 0, |
7af4cc3f | 369 | NFNL_SUBSYS_QUEUE << 8 | NFQNL_MSG_PACKET, |
3da07c0c DM |
370 | sizeof(struct nfgenmsg), 0); |
371 | if (!nlh) { | |
372 | kfree_skb(skb); | |
373 | return NULL; | |
374 | } | |
375 | nfmsg = nlmsg_data(nlh); | |
02f014d8 | 376 | nfmsg->nfgen_family = entry->pf; |
7af4cc3f HW |
377 | nfmsg->version = NFNETLINK_V0; |
378 | nfmsg->res_id = htons(queue->queue_num); | |
379 | ||
5863702a ED |
380 | nla = __nla_reserve(skb, NFQA_PACKET_HDR, sizeof(*pmsg)); |
381 | pmsg = nla_data(nla); | |
382 | pmsg->hw_protocol = entskb->protocol; | |
383 | pmsg->hook = entry->hook; | |
384 | *packet_id_ptr = &pmsg->packet_id; | |
7af4cc3f | 385 | |
02f014d8 | 386 | indev = entry->indev; |
3e4ead4f | 387 | if (indev) { |
fbcd923c | 388 | #ifndef CONFIG_BRIDGE_NETFILTER |
a447189e DM |
389 | if (nla_put_be32(skb, NFQA_IFINDEX_INDEV, htonl(indev->ifindex))) |
390 | goto nla_put_failure; | |
fbcd923c | 391 | #else |
02f014d8 | 392 | if (entry->pf == PF_BRIDGE) { |
fbcd923c | 393 | /* Case 1: indev is physical input device, we need to |
601e68e1 | 394 | * look for bridge group (when called from |
fbcd923c | 395 | * netfilter_bridge) */ |
a447189e DM |
396 | if (nla_put_be32(skb, NFQA_IFINDEX_PHYSINDEV, |
397 | htonl(indev->ifindex)) || | |
fbcd923c | 398 | /* this is the bridge group "brX" */ |
f350a0a8 | 399 | /* rcu_read_lock()ed by __nf_queue */ |
a447189e DM |
400 | nla_put_be32(skb, NFQA_IFINDEX_INDEV, |
401 | htonl(br_port_get_rcu(indev)->br->dev->ifindex))) | |
402 | goto nla_put_failure; | |
fbcd923c HW |
403 | } else { |
404 | /* Case 2: indev is bridge group, we need to look for | |
405 | * physical device (when called from ipv4) */ | |
a447189e DM |
406 | if (nla_put_be32(skb, NFQA_IFINDEX_INDEV, |
407 | htonl(indev->ifindex))) | |
408 | goto nla_put_failure; | |
409 | if (entskb->nf_bridge && entskb->nf_bridge->physindev && | |
410 | nla_put_be32(skb, NFQA_IFINDEX_PHYSINDEV, | |
411 | htonl(entskb->nf_bridge->physindev->ifindex))) | |
412 | goto nla_put_failure; | |
fbcd923c HW |
413 | } |
414 | #endif | |
7af4cc3f HW |
415 | } |
416 | ||
3e4ead4f | 417 | if (outdev) { |
fbcd923c | 418 | #ifndef CONFIG_BRIDGE_NETFILTER |
a447189e DM |
419 | if (nla_put_be32(skb, NFQA_IFINDEX_OUTDEV, htonl(outdev->ifindex))) |
420 | goto nla_put_failure; | |
fbcd923c | 421 | #else |
02f014d8 | 422 | if (entry->pf == PF_BRIDGE) { |
fbcd923c | 423 | /* Case 1: outdev is physical output device, we need to |
601e68e1 | 424 | * look for bridge group (when called from |
fbcd923c | 425 | * netfilter_bridge) */ |
a447189e DM |
426 | if (nla_put_be32(skb, NFQA_IFINDEX_PHYSOUTDEV, |
427 | htonl(outdev->ifindex)) || | |
fbcd923c | 428 | /* this is the bridge group "brX" */ |
f350a0a8 | 429 | /* rcu_read_lock()ed by __nf_queue */ |
a447189e DM |
430 | nla_put_be32(skb, NFQA_IFINDEX_OUTDEV, |
431 | htonl(br_port_get_rcu(outdev)->br->dev->ifindex))) | |
432 | goto nla_put_failure; | |
fbcd923c HW |
433 | } else { |
434 | /* Case 2: outdev is bridge group, we need to look for | |
435 | * physical output device (when called from ipv4) */ | |
a447189e DM |
436 | if (nla_put_be32(skb, NFQA_IFINDEX_OUTDEV, |
437 | htonl(outdev->ifindex))) | |
438 | goto nla_put_failure; | |
439 | if (entskb->nf_bridge && entskb->nf_bridge->physoutdev && | |
440 | nla_put_be32(skb, NFQA_IFINDEX_PHYSOUTDEV, | |
441 | htonl(entskb->nf_bridge->physoutdev->ifindex))) | |
442 | goto nla_put_failure; | |
fbcd923c HW |
443 | } |
444 | #endif | |
7af4cc3f HW |
445 | } |
446 | ||
a447189e DM |
447 | if (entskb->mark && |
448 | nla_put_be32(skb, NFQA_MARK, htonl(entskb->mark))) | |
449 | goto nla_put_failure; | |
7af4cc3f | 450 | |
2c38de4c NC |
451 | if (indev && entskb->dev && |
452 | entskb->mac_header != entskb->network_header) { | |
7af4cc3f | 453 | struct nfqnl_msg_packet_hw phw; |
b95cce35 SH |
454 | int len = dev_parse_header(entskb, phw.hw_addr); |
455 | if (len) { | |
456 | phw.hw_addrlen = htons(len); | |
a447189e DM |
457 | if (nla_put(skb, NFQA_HWADDR, sizeof(phw), &phw)) |
458 | goto nla_put_failure; | |
b95cce35 | 459 | } |
7af4cc3f HW |
460 | } |
461 | ||
b7aa0bf7 | 462 | if (entskb->tstamp.tv64) { |
7af4cc3f | 463 | struct nfqnl_msg_packet_timestamp ts; |
b7aa0bf7 ED |
464 | struct timeval tv = ktime_to_timeval(entskb->tstamp); |
465 | ts.sec = cpu_to_be64(tv.tv_sec); | |
466 | ts.usec = cpu_to_be64(tv.tv_usec); | |
7af4cc3f | 467 | |
a447189e DM |
468 | if (nla_put(skb, NFQA_TIMESTAMP, sizeof(ts), &ts)) |
469 | goto nla_put_failure; | |
7af4cc3f HW |
470 | } |
471 | ||
ae08ce00 ED |
472 | if (ct && nfqnl_ct_put(skb, ct, ctinfo) < 0) |
473 | goto nla_put_failure; | |
474 | ||
475 | if (cap_len > 0 && nla_put_be32(skb, NFQA_CAP_LEN, htonl(cap_len))) | |
476 | goto nla_put_failure; | |
477 | ||
7237190d FW |
478 | if (nfqnl_put_packet_info(skb, entskb)) |
479 | goto nla_put_failure; | |
480 | ||
7af4cc3f | 481 | if (data_len) { |
df6fb868 | 482 | struct nlattr *nla; |
7af4cc3f | 483 | |
ae08ce00 ED |
484 | if (skb_tailroom(skb) < sizeof(*nla) + hlen) |
485 | goto nla_put_failure; | |
7af4cc3f | 486 | |
ae08ce00 | 487 | nla = (struct nlattr *)skb_put(skb, sizeof(*nla)); |
df6fb868 | 488 | nla->nla_type = NFQA_PAYLOAD; |
ae08ce00 | 489 | nla->nla_len = nla_attr_size(data_len); |
7af4cc3f | 490 | |
ae08ce00 | 491 | nfqnl_zcopy(skb, entskb, data_len, hlen); |
7af4cc3f | 492 | } |
601e68e1 | 493 | |
ae08ce00 | 494 | nlh->nlmsg_len = skb->len; |
7af4cc3f HW |
495 | return skb; |
496 | ||
df6fb868 | 497 | nla_put_failure: |
a6729955 | 498 | kfree_skb(skb); |
e87cc472 | 499 | net_err_ratelimited("nf_queue: error creating packet message\n"); |
7af4cc3f HW |
500 | return NULL; |
501 | } | |
502 | ||
503 | static int | |
a5fedd43 FW |
504 | __nfqnl_enqueue_packet(struct net *net, struct nfqnl_instance *queue, |
505 | struct nf_queue_entry *entry) | |
7af4cc3f | 506 | { |
7af4cc3f | 507 | struct sk_buff *nskb; |
f1585086 | 508 | int err = -ENOBUFS; |
5863702a | 509 | __be32 *packet_id_ptr; |
fdb694a0 | 510 | int failopen = 0; |
7af4cc3f | 511 | |
5863702a | 512 | nskb = nfqnl_build_packet_message(queue, entry, &packet_id_ptr); |
f1585086 FW |
513 | if (nskb == NULL) { |
514 | err = -ENOMEM; | |
0ef0f465 | 515 | goto err_out; |
f1585086 | 516 | } |
7af4cc3f | 517 | spin_lock_bh(&queue->lock); |
601e68e1 | 518 | |
7af4cc3f | 519 | if (queue->queue_total >= queue->queue_maxlen) { |
fdb694a0 KK |
520 | if (queue->flags & NFQA_CFG_F_FAIL_OPEN) { |
521 | failopen = 1; | |
522 | err = 0; | |
523 | } else { | |
524 | queue->queue_dropped++; | |
525 | net_warn_ratelimited("nf_queue: full at %d entries, dropping packets(s)\n", | |
526 | queue->queue_total); | |
527 | } | |
7af4cc3f HW |
528 | goto err_out_free_nskb; |
529 | } | |
5863702a ED |
530 | entry->id = ++queue->id_sequence; |
531 | *packet_id_ptr = htonl(entry->id); | |
7af4cc3f HW |
532 | |
533 | /* nfnetlink_unicast will either free the nskb or add it to a socket */ | |
e8179610 | 534 | err = nfnetlink_unicast(nskb, net, queue->peer_portid, MSG_DONTWAIT); |
0ef0f465 | 535 | if (err < 0) { |
601e68e1 | 536 | queue->queue_user_dropped++; |
7af4cc3f HW |
537 | goto err_out_unlock; |
538 | } | |
539 | ||
540 | __enqueue_entry(queue, entry); | |
541 | ||
542 | spin_unlock_bh(&queue->lock); | |
0ef0f465 | 543 | return 0; |
7af4cc3f HW |
544 | |
545 | err_out_free_nskb: | |
601e68e1 | 546 | kfree_skb(nskb); |
7af4cc3f HW |
547 | err_out_unlock: |
548 | spin_unlock_bh(&queue->lock); | |
fdb694a0 KK |
549 | if (failopen) |
550 | nf_reinject(entry, NF_ACCEPT); | |
0ef0f465 | 551 | err_out: |
f1585086 | 552 | return err; |
7af4cc3f HW |
553 | } |
554 | ||
a5fedd43 FW |
555 | static struct nf_queue_entry * |
556 | nf_queue_entry_dup(struct nf_queue_entry *e) | |
557 | { | |
558 | struct nf_queue_entry *entry = kmemdup(e, e->size, GFP_ATOMIC); | |
559 | if (entry) { | |
560 | if (nf_queue_entry_get_refs(entry)) | |
561 | return entry; | |
562 | kfree(entry); | |
563 | } | |
564 | return NULL; | |
565 | } | |
566 | ||
567 | #ifdef CONFIG_BRIDGE_NETFILTER | |
568 | /* When called from bridge netfilter, skb->data must point to MAC header | |
569 | * before calling skb_gso_segment(). Else, original MAC header is lost | |
570 | * and segmented skbs will be sent to wrong destination. | |
571 | */ | |
572 | static void nf_bridge_adjust_skb_data(struct sk_buff *skb) | |
573 | { | |
574 | if (skb->nf_bridge) | |
575 | __skb_push(skb, skb->network_header - skb->mac_header); | |
576 | } | |
577 | ||
578 | static void nf_bridge_adjust_segmented_data(struct sk_buff *skb) | |
579 | { | |
580 | if (skb->nf_bridge) | |
581 | __skb_pull(skb, skb->network_header - skb->mac_header); | |
582 | } | |
583 | #else | |
584 | #define nf_bridge_adjust_skb_data(s) do {} while (0) | |
585 | #define nf_bridge_adjust_segmented_data(s) do {} while (0) | |
586 | #endif | |
587 | ||
588 | static void free_entry(struct nf_queue_entry *entry) | |
589 | { | |
590 | nf_queue_entry_release_refs(entry); | |
591 | kfree(entry); | |
592 | } | |
593 | ||
594 | static int | |
595 | __nfqnl_enqueue_packet_gso(struct net *net, struct nfqnl_instance *queue, | |
596 | struct sk_buff *skb, struct nf_queue_entry *entry) | |
597 | { | |
598 | int ret = -ENOMEM; | |
599 | struct nf_queue_entry *entry_seg; | |
600 | ||
601 | nf_bridge_adjust_segmented_data(skb); | |
602 | ||
603 | if (skb->next == NULL) { /* last packet, no need to copy entry */ | |
604 | struct sk_buff *gso_skb = entry->skb; | |
605 | entry->skb = skb; | |
606 | ret = __nfqnl_enqueue_packet(net, queue, entry); | |
607 | if (ret) | |
608 | entry->skb = gso_skb; | |
609 | return ret; | |
610 | } | |
611 | ||
612 | skb->next = NULL; | |
613 | ||
614 | entry_seg = nf_queue_entry_dup(entry); | |
615 | if (entry_seg) { | |
616 | entry_seg->skb = skb; | |
617 | ret = __nfqnl_enqueue_packet(net, queue, entry_seg); | |
618 | if (ret) | |
619 | free_entry(entry_seg); | |
620 | } | |
621 | return ret; | |
622 | } | |
623 | ||
624 | static int | |
625 | nfqnl_enqueue_packet(struct nf_queue_entry *entry, unsigned int queuenum) | |
626 | { | |
627 | unsigned int queued; | |
628 | struct nfqnl_instance *queue; | |
629 | struct sk_buff *skb, *segs; | |
630 | int err = -ENOBUFS; | |
631 | struct net *net = dev_net(entry->indev ? | |
632 | entry->indev : entry->outdev); | |
633 | struct nfnl_queue_net *q = nfnl_queue_pernet(net); | |
634 | ||
635 | /* rcu_read_lock()ed by nf_hook_slow() */ | |
636 | queue = instance_lookup(q, queuenum); | |
637 | if (!queue) | |
638 | return -ESRCH; | |
639 | ||
640 | if (queue->copy_mode == NFQNL_COPY_NONE) | |
641 | return -EINVAL; | |
642 | ||
00bd1cc2 | 643 | if ((queue->flags & NFQA_CFG_F_GSO) || !skb_is_gso(entry->skb)) |
a5fedd43 FW |
644 | return __nfqnl_enqueue_packet(net, queue, entry); |
645 | ||
646 | skb = entry->skb; | |
647 | ||
648 | switch (entry->pf) { | |
649 | case NFPROTO_IPV4: | |
650 | skb->protocol = htons(ETH_P_IP); | |
651 | break; | |
652 | case NFPROTO_IPV6: | |
653 | skb->protocol = htons(ETH_P_IPV6); | |
654 | break; | |
655 | } | |
656 | ||
657 | nf_bridge_adjust_skb_data(skb); | |
658 | segs = skb_gso_segment(skb, 0); | |
659 | /* Does not use PTR_ERR to limit the number of error codes that can be | |
660 | * returned by nf_queue. For instance, callers rely on -ECANCELED to | |
661 | * mean 'ignore this hook'. | |
662 | */ | |
663 | if (IS_ERR(segs)) | |
664 | goto out_err; | |
665 | queued = 0; | |
666 | err = 0; | |
667 | do { | |
668 | struct sk_buff *nskb = segs->next; | |
669 | if (err == 0) | |
670 | err = __nfqnl_enqueue_packet_gso(net, queue, | |
671 | segs, entry); | |
672 | if (err == 0) | |
673 | queued++; | |
674 | else | |
675 | kfree_skb(segs); | |
676 | segs = nskb; | |
677 | } while (segs); | |
678 | ||
679 | if (queued) { | |
680 | if (err) /* some segments are already queued */ | |
681 | free_entry(entry); | |
682 | kfree_skb(skb); | |
683 | return 0; | |
684 | } | |
685 | out_err: | |
686 | nf_bridge_adjust_segmented_data(skb); | |
687 | return err; | |
688 | } | |
689 | ||
7af4cc3f | 690 | static int |
8c88f87c | 691 | nfqnl_mangle(void *data, int data_len, struct nf_queue_entry *e, int diff) |
7af4cc3f | 692 | { |
e2b58a67 | 693 | struct sk_buff *nskb; |
7af4cc3f | 694 | |
d8a585d7 PM |
695 | if (diff < 0) { |
696 | if (pskb_trim(e->skb, data_len)) | |
697 | return -ENOMEM; | |
698 | } else if (diff > 0) { | |
7af4cc3f HW |
699 | if (data_len > 0xFFFF) |
700 | return -EINVAL; | |
701 | if (diff > skb_tailroom(e->skb)) { | |
9a732ed6 AE |
702 | nskb = skb_copy_expand(e->skb, skb_headroom(e->skb), |
703 | diff, GFP_ATOMIC); | |
e2b58a67 | 704 | if (!nskb) { |
1158ba27 | 705 | printk(KERN_WARNING "nf_queue: OOM " |
7af4cc3f | 706 | "in mangle, dropping packet\n"); |
e2b58a67 | 707 | return -ENOMEM; |
7af4cc3f | 708 | } |
e2b58a67 PM |
709 | kfree_skb(e->skb); |
710 | e->skb = nskb; | |
7af4cc3f HW |
711 | } |
712 | skb_put(e->skb, diff); | |
713 | } | |
37d41879 | 714 | if (!skb_make_writable(e->skb, data_len)) |
7af4cc3f | 715 | return -ENOMEM; |
27d7ff46 | 716 | skb_copy_to_linear_data(e->skb, data, data_len); |
e7dfb09a | 717 | e->skb->ip_summed = CHECKSUM_NONE; |
7af4cc3f HW |
718 | return 0; |
719 | } | |
720 | ||
7af4cc3f HW |
721 | static int |
722 | nfqnl_set_mode(struct nfqnl_instance *queue, | |
723 | unsigned char mode, unsigned int range) | |
724 | { | |
c5de0dfd | 725 | int status = 0; |
7af4cc3f HW |
726 | |
727 | spin_lock_bh(&queue->lock); | |
c5de0dfd PM |
728 | switch (mode) { |
729 | case NFQNL_COPY_NONE: | |
730 | case NFQNL_COPY_META: | |
731 | queue->copy_mode = mode; | |
732 | queue->copy_range = 0; | |
733 | break; | |
734 | ||
735 | case NFQNL_COPY_PACKET: | |
736 | queue->copy_mode = mode; | |
9cefbbc9 FW |
737 | if (range == 0 || range > NFQNL_MAX_COPY_RANGE) |
738 | queue->copy_range = NFQNL_MAX_COPY_RANGE; | |
c5de0dfd PM |
739 | else |
740 | queue->copy_range = range; | |
741 | break; | |
742 | ||
743 | default: | |
744 | status = -EINVAL; | |
745 | ||
746 | } | |
7af4cc3f HW |
747 | spin_unlock_bh(&queue->lock); |
748 | ||
749 | return status; | |
750 | } | |
751 | ||
752 | static int | |
02f014d8 | 753 | dev_cmp(struct nf_queue_entry *entry, unsigned long ifindex) |
7af4cc3f | 754 | { |
02f014d8 PM |
755 | if (entry->indev) |
756 | if (entry->indev->ifindex == ifindex) | |
7af4cc3f | 757 | return 1; |
02f014d8 PM |
758 | if (entry->outdev) |
759 | if (entry->outdev->ifindex == ifindex) | |
7af4cc3f | 760 | return 1; |
ef47c6a7 PM |
761 | #ifdef CONFIG_BRIDGE_NETFILTER |
762 | if (entry->skb->nf_bridge) { | |
763 | if (entry->skb->nf_bridge->physindev && | |
764 | entry->skb->nf_bridge->physindev->ifindex == ifindex) | |
765 | return 1; | |
766 | if (entry->skb->nf_bridge->physoutdev && | |
767 | entry->skb->nf_bridge->physoutdev->ifindex == ifindex) | |
768 | return 1; | |
769 | } | |
770 | #endif | |
7af4cc3f HW |
771 | return 0; |
772 | } | |
773 | ||
774 | /* drop all packets with either indev or outdev == ifindex from all queue | |
775 | * instances */ | |
776 | static void | |
e8179610 | 777 | nfqnl_dev_drop(struct net *net, int ifindex) |
7af4cc3f HW |
778 | { |
779 | int i; | |
e8179610 | 780 | struct nfnl_queue_net *q = nfnl_queue_pernet(net); |
601e68e1 | 781 | |
9872bec7 | 782 | rcu_read_lock(); |
7af4cc3f | 783 | |
9872bec7 | 784 | for (i = 0; i < INSTANCE_BUCKETS; i++) { |
7af4cc3f | 785 | struct nfqnl_instance *inst; |
e8179610 | 786 | struct hlist_head *head = &q->instance_table[i]; |
7af4cc3f | 787 | |
b67bfe0d | 788 | hlist_for_each_entry_rcu(inst, head, hlist) |
b43d8d85 | 789 | nfqnl_flush(inst, dev_cmp, ifindex); |
7af4cc3f HW |
790 | } |
791 | ||
9872bec7 | 792 | rcu_read_unlock(); |
7af4cc3f HW |
793 | } |
794 | ||
795 | #define RCV_SKB_FAIL(err) do { netlink_ack(skb, nlh, (err)); return; } while (0) | |
796 | ||
797 | static int | |
798 | nfqnl_rcv_dev_event(struct notifier_block *this, | |
799 | unsigned long event, void *ptr) | |
800 | { | |
801 | struct net_device *dev = ptr; | |
802 | ||
803 | /* Drop any packets associated with the downed device */ | |
804 | if (event == NETDEV_DOWN) | |
e8179610 | 805 | nfqnl_dev_drop(dev_net(dev), dev->ifindex); |
7af4cc3f HW |
806 | return NOTIFY_DONE; |
807 | } | |
808 | ||
809 | static struct notifier_block nfqnl_dev_notifier = { | |
810 | .notifier_call = nfqnl_rcv_dev_event, | |
811 | }; | |
812 | ||
813 | static int | |
814 | nfqnl_rcv_nl_event(struct notifier_block *this, | |
815 | unsigned long event, void *ptr) | |
816 | { | |
817 | struct netlink_notify *n = ptr; | |
e8179610 | 818 | struct nfnl_queue_net *q = nfnl_queue_pernet(n->net); |
7af4cc3f | 819 | |
dee5817e | 820 | if (event == NETLINK_URELEASE && n->protocol == NETLINK_NETFILTER) { |
7af4cc3f HW |
821 | int i; |
822 | ||
15e47304 | 823 | /* destroy all instances for this portid */ |
e8179610 | 824 | spin_lock(&q->instances_lock); |
9872bec7 | 825 | for (i = 0; i < INSTANCE_BUCKETS; i++) { |
b67bfe0d | 826 | struct hlist_node *t2; |
7af4cc3f | 827 | struct nfqnl_instance *inst; |
e8179610 | 828 | struct hlist_head *head = &q->instance_table[i]; |
7af4cc3f | 829 | |
b67bfe0d | 830 | hlist_for_each_entry_safe(inst, t2, head, hlist) { |
e8179610 | 831 | if (n->portid == inst->peer_portid) |
7af4cc3f HW |
832 | __instance_destroy(inst); |
833 | } | |
834 | } | |
e8179610 | 835 | spin_unlock(&q->instances_lock); |
7af4cc3f HW |
836 | } |
837 | return NOTIFY_DONE; | |
838 | } | |
839 | ||
840 | static struct notifier_block nfqnl_rtnl_notifier = { | |
841 | .notifier_call = nfqnl_rcv_nl_event, | |
842 | }; | |
843 | ||
5bf75853 PM |
844 | static const struct nla_policy nfqa_verdict_policy[NFQA_MAX+1] = { |
845 | [NFQA_VERDICT_HDR] = { .len = sizeof(struct nfqnl_msg_verdict_hdr) }, | |
846 | [NFQA_MARK] = { .type = NLA_U32 }, | |
847 | [NFQA_PAYLOAD] = { .type = NLA_UNSPEC }, | |
9cb01766 | 848 | [NFQA_CT] = { .type = NLA_UNSPEC }, |
838ab636 HW |
849 | }; |
850 | ||
97d32cf9 FW |
851 | static const struct nla_policy nfqa_verdict_batch_policy[NFQA_MAX+1] = { |
852 | [NFQA_VERDICT_HDR] = { .len = sizeof(struct nfqnl_msg_verdict_hdr) }, | |
853 | [NFQA_MARK] = { .type = NLA_U32 }, | |
854 | }; | |
855 | ||
e8179610 G |
856 | static struct nfqnl_instance * |
857 | verdict_instance_lookup(struct nfnl_queue_net *q, u16 queue_num, int nlportid) | |
97d32cf9 FW |
858 | { |
859 | struct nfqnl_instance *queue; | |
860 | ||
e8179610 | 861 | queue = instance_lookup(q, queue_num); |
97d32cf9 FW |
862 | if (!queue) |
863 | return ERR_PTR(-ENODEV); | |
864 | ||
15e47304 | 865 | if (queue->peer_portid != nlportid) |
97d32cf9 FW |
866 | return ERR_PTR(-EPERM); |
867 | ||
868 | return queue; | |
869 | } | |
870 | ||
871 | static struct nfqnl_msg_verdict_hdr* | |
872 | verdicthdr_get(const struct nlattr * const nfqa[]) | |
873 | { | |
874 | struct nfqnl_msg_verdict_hdr *vhdr; | |
875 | unsigned int verdict; | |
876 | ||
877 | if (!nfqa[NFQA_VERDICT_HDR]) | |
878 | return NULL; | |
879 | ||
880 | vhdr = nla_data(nfqa[NFQA_VERDICT_HDR]); | |
c6675233 FW |
881 | verdict = ntohl(vhdr->verdict) & NF_VERDICT_MASK; |
882 | if (verdict > NF_MAX_VERDICT || verdict == NF_STOLEN) | |
97d32cf9 FW |
883 | return NULL; |
884 | return vhdr; | |
885 | } | |
886 | ||
887 | static int nfq_id_after(unsigned int id, unsigned int max) | |
888 | { | |
889 | return (int)(id - max) > 0; | |
890 | } | |
891 | ||
892 | static int | |
893 | nfqnl_recv_verdict_batch(struct sock *ctnl, struct sk_buff *skb, | |
894 | const struct nlmsghdr *nlh, | |
895 | const struct nlattr * const nfqa[]) | |
896 | { | |
3da07c0c | 897 | struct nfgenmsg *nfmsg = nlmsg_data(nlh); |
97d32cf9 FW |
898 | struct nf_queue_entry *entry, *tmp; |
899 | unsigned int verdict, maxid; | |
900 | struct nfqnl_msg_verdict_hdr *vhdr; | |
901 | struct nfqnl_instance *queue; | |
902 | LIST_HEAD(batch_list); | |
903 | u16 queue_num = ntohs(nfmsg->res_id); | |
904 | ||
e8179610 G |
905 | struct net *net = sock_net(ctnl); |
906 | struct nfnl_queue_net *q = nfnl_queue_pernet(net); | |
907 | ||
908 | queue = verdict_instance_lookup(q, queue_num, | |
909 | NETLINK_CB(skb).portid); | |
97d32cf9 FW |
910 | if (IS_ERR(queue)) |
911 | return PTR_ERR(queue); | |
912 | ||
913 | vhdr = verdicthdr_get(nfqa); | |
914 | if (!vhdr) | |
915 | return -EINVAL; | |
916 | ||
917 | verdict = ntohl(vhdr->verdict); | |
918 | maxid = ntohl(vhdr->id); | |
919 | ||
920 | spin_lock_bh(&queue->lock); | |
921 | ||
922 | list_for_each_entry_safe(entry, tmp, &queue->queue_list, list) { | |
923 | if (nfq_id_after(entry->id, maxid)) | |
924 | break; | |
925 | __dequeue_entry(queue, entry); | |
926 | list_add_tail(&entry->list, &batch_list); | |
927 | } | |
928 | ||
929 | spin_unlock_bh(&queue->lock); | |
930 | ||
931 | if (list_empty(&batch_list)) | |
932 | return -ENOENT; | |
933 | ||
934 | list_for_each_entry_safe(entry, tmp, &batch_list, list) { | |
935 | if (nfqa[NFQA_MARK]) | |
936 | entry->skb->mark = ntohl(nla_get_be32(nfqa[NFQA_MARK])); | |
937 | nf_reinject(entry, verdict); | |
938 | } | |
939 | return 0; | |
940 | } | |
941 | ||
7af4cc3f HW |
942 | static int |
943 | nfqnl_recv_verdict(struct sock *ctnl, struct sk_buff *skb, | |
39938324 PM |
944 | const struct nlmsghdr *nlh, |
945 | const struct nlattr * const nfqa[]) | |
7af4cc3f | 946 | { |
3da07c0c | 947 | struct nfgenmsg *nfmsg = nlmsg_data(nlh); |
7af4cc3f HW |
948 | u_int16_t queue_num = ntohs(nfmsg->res_id); |
949 | ||
950 | struct nfqnl_msg_verdict_hdr *vhdr; | |
951 | struct nfqnl_instance *queue; | |
952 | unsigned int verdict; | |
02f014d8 | 953 | struct nf_queue_entry *entry; |
8c88f87c PNA |
954 | enum ip_conntrack_info uninitialized_var(ctinfo); |
955 | struct nf_conn *ct = NULL; | |
7af4cc3f | 956 | |
e8179610 G |
957 | struct net *net = sock_net(ctnl); |
958 | struct nfnl_queue_net *q = nfnl_queue_pernet(net); | |
7af4cc3f | 959 | |
e8179610 G |
960 | queue = instance_lookup(q, queue_num); |
961 | if (!queue) | |
962 | queue = verdict_instance_lookup(q, queue_num, | |
963 | NETLINK_CB(skb).portid); | |
97d32cf9 FW |
964 | if (IS_ERR(queue)) |
965 | return PTR_ERR(queue); | |
7af4cc3f | 966 | |
97d32cf9 FW |
967 | vhdr = verdicthdr_get(nfqa); |
968 | if (!vhdr) | |
84a797dd | 969 | return -EINVAL; |
7af4cc3f | 970 | |
7af4cc3f HW |
971 | verdict = ntohl(vhdr->verdict); |
972 | ||
b43d8d85 | 973 | entry = find_dequeue_entry(queue, ntohl(vhdr->id)); |
84a797dd ED |
974 | if (entry == NULL) |
975 | return -ENOENT; | |
7af4cc3f | 976 | |
9cb01766 | 977 | rcu_read_lock(); |
7c622345 PNA |
978 | if (nfqa[NFQA_CT] && (queue->flags & NFQA_CFG_F_CONNTRACK)) |
979 | ct = nfqnl_ct_parse(entry->skb, nfqa[NFQA_CT], &ctinfo); | |
9cb01766 | 980 | |
df6fb868 | 981 | if (nfqa[NFQA_PAYLOAD]) { |
8c88f87c PNA |
982 | u16 payload_len = nla_len(nfqa[NFQA_PAYLOAD]); |
983 | int diff = payload_len - entry->skb->len; | |
984 | ||
df6fb868 | 985 | if (nfqnl_mangle(nla_data(nfqa[NFQA_PAYLOAD]), |
8c88f87c | 986 | payload_len, entry, diff) < 0) |
7af4cc3f | 987 | verdict = NF_DROP; |
8c88f87c | 988 | |
7c622345 PNA |
989 | if (ct) |
990 | nfqnl_ct_seq_adjust(skb, ct, ctinfo, diff); | |
7af4cc3f | 991 | } |
8c88f87c | 992 | rcu_read_unlock(); |
7af4cc3f | 993 | |
df6fb868 | 994 | if (nfqa[NFQA_MARK]) |
ea3a66ff | 995 | entry->skb->mark = ntohl(nla_get_be32(nfqa[NFQA_MARK])); |
601e68e1 | 996 | |
4b3d15ef | 997 | nf_reinject(entry, verdict); |
7af4cc3f HW |
998 | return 0; |
999 | } | |
1000 | ||
1001 | static int | |
1002 | nfqnl_recv_unsupp(struct sock *ctnl, struct sk_buff *skb, | |
39938324 PM |
1003 | const struct nlmsghdr *nlh, |
1004 | const struct nlattr * const nfqa[]) | |
7af4cc3f HW |
1005 | { |
1006 | return -ENOTSUPP; | |
1007 | } | |
1008 | ||
5bf75853 PM |
1009 | static const struct nla_policy nfqa_cfg_policy[NFQA_CFG_MAX+1] = { |
1010 | [NFQA_CFG_CMD] = { .len = sizeof(struct nfqnl_msg_config_cmd) }, | |
1011 | [NFQA_CFG_PARAMS] = { .len = sizeof(struct nfqnl_msg_config_params) }, | |
838ab636 HW |
1012 | }; |
1013 | ||
e3ac5298 | 1014 | static const struct nf_queue_handler nfqh = { |
bbd86b9f HW |
1015 | .outfn = &nfqnl_enqueue_packet, |
1016 | }; | |
1017 | ||
7af4cc3f HW |
1018 | static int |
1019 | nfqnl_recv_config(struct sock *ctnl, struct sk_buff *skb, | |
39938324 PM |
1020 | const struct nlmsghdr *nlh, |
1021 | const struct nlattr * const nfqa[]) | |
7af4cc3f | 1022 | { |
3da07c0c | 1023 | struct nfgenmsg *nfmsg = nlmsg_data(nlh); |
7af4cc3f HW |
1024 | u_int16_t queue_num = ntohs(nfmsg->res_id); |
1025 | struct nfqnl_instance *queue; | |
9872bec7 | 1026 | struct nfqnl_msg_config_cmd *cmd = NULL; |
e8179610 G |
1027 | struct net *net = sock_net(ctnl); |
1028 | struct nfnl_queue_net *q = nfnl_queue_pernet(net); | |
838ab636 | 1029 | int ret = 0; |
7af4cc3f | 1030 | |
9872bec7 PM |
1031 | if (nfqa[NFQA_CFG_CMD]) { |
1032 | cmd = nla_data(nfqa[NFQA_CFG_CMD]); | |
1033 | ||
0360ae41 | 1034 | /* Obsolete commands without queue context */ |
9872bec7 | 1035 | switch (cmd->command) { |
0360ae41 FW |
1036 | case NFQNL_CFG_CMD_PF_BIND: return 0; |
1037 | case NFQNL_CFG_CMD_PF_UNBIND: return 0; | |
9872bec7 | 1038 | } |
9872bec7 PM |
1039 | } |
1040 | ||
1041 | rcu_read_lock(); | |
e8179610 | 1042 | queue = instance_lookup(q, queue_num); |
15e47304 | 1043 | if (queue && queue->peer_portid != NETLINK_CB(skb).portid) { |
a3c8e7fd | 1044 | ret = -EPERM; |
9872bec7 | 1045 | goto err_out_unlock; |
a3c8e7fd PM |
1046 | } |
1047 | ||
9872bec7 | 1048 | if (cmd != NULL) { |
7af4cc3f HW |
1049 | switch (cmd->command) { |
1050 | case NFQNL_CFG_CMD_BIND: | |
9872bec7 PM |
1051 | if (queue) { |
1052 | ret = -EBUSY; | |
1053 | goto err_out_unlock; | |
1054 | } | |
e8179610 G |
1055 | queue = instance_create(q, queue_num, |
1056 | NETLINK_CB(skb).portid); | |
baab2ce7 PM |
1057 | if (IS_ERR(queue)) { |
1058 | ret = PTR_ERR(queue); | |
9872bec7 PM |
1059 | goto err_out_unlock; |
1060 | } | |
7af4cc3f HW |
1061 | break; |
1062 | case NFQNL_CFG_CMD_UNBIND: | |
9872bec7 PM |
1063 | if (!queue) { |
1064 | ret = -ENODEV; | |
1065 | goto err_out_unlock; | |
1066 | } | |
e8179610 | 1067 | instance_destroy(q, queue); |
7af4cc3f HW |
1068 | break; |
1069 | case NFQNL_CFG_CMD_PF_BIND: | |
7af4cc3f | 1070 | case NFQNL_CFG_CMD_PF_UNBIND: |
7af4cc3f HW |
1071 | break; |
1072 | default: | |
cd21f0ac | 1073 | ret = -ENOTSUPP; |
838ab636 | 1074 | break; |
7af4cc3f | 1075 | } |
7af4cc3f HW |
1076 | } |
1077 | ||
df6fb868 | 1078 | if (nfqa[NFQA_CFG_PARAMS]) { |
7af4cc3f | 1079 | struct nfqnl_msg_config_params *params; |
7af4cc3f | 1080 | |
406dbfc9 | 1081 | if (!queue) { |
a3c8e7fd | 1082 | ret = -ENODEV; |
9872bec7 | 1083 | goto err_out_unlock; |
406dbfc9 | 1084 | } |
df6fb868 | 1085 | params = nla_data(nfqa[NFQA_CFG_PARAMS]); |
7af4cc3f HW |
1086 | nfqnl_set_mode(queue, params->copy_mode, |
1087 | ntohl(params->copy_range)); | |
1088 | } | |
1089 | ||
df6fb868 | 1090 | if (nfqa[NFQA_CFG_QUEUE_MAXLEN]) { |
829e17a1 | 1091 | __be32 *queue_maxlen; |
a3c8e7fd PM |
1092 | |
1093 | if (!queue) { | |
1094 | ret = -ENODEV; | |
9872bec7 | 1095 | goto err_out_unlock; |
a3c8e7fd | 1096 | } |
df6fb868 | 1097 | queue_maxlen = nla_data(nfqa[NFQA_CFG_QUEUE_MAXLEN]); |
829e17a1 EL |
1098 | spin_lock_bh(&queue->lock); |
1099 | queue->queue_maxlen = ntohl(*queue_maxlen); | |
1100 | spin_unlock_bh(&queue->lock); | |
1101 | } | |
1102 | ||
fdb694a0 KK |
1103 | if (nfqa[NFQA_CFG_FLAGS]) { |
1104 | __u32 flags, mask; | |
1105 | ||
1106 | if (!queue) { | |
1107 | ret = -ENODEV; | |
1108 | goto err_out_unlock; | |
1109 | } | |
1110 | ||
1111 | if (!nfqa[NFQA_CFG_MASK]) { | |
1112 | /* A mask is needed to specify which flags are being | |
1113 | * changed. | |
1114 | */ | |
1115 | ret = -EINVAL; | |
1116 | goto err_out_unlock; | |
1117 | } | |
1118 | ||
1119 | flags = ntohl(nla_get_be32(nfqa[NFQA_CFG_FLAGS])); | |
1120 | mask = ntohl(nla_get_be32(nfqa[NFQA_CFG_MASK])); | |
1121 | ||
46ba5a25 KK |
1122 | if (flags >= NFQA_CFG_F_MAX) { |
1123 | ret = -EOPNOTSUPP; | |
1124 | goto err_out_unlock; | |
1125 | } | |
1126 | ||
fdb694a0 KK |
1127 | spin_lock_bh(&queue->lock); |
1128 | queue->flags &= ~mask; | |
1129 | queue->flags |= flags & mask; | |
1130 | spin_unlock_bh(&queue->lock); | |
1131 | } | |
1132 | ||
9872bec7 PM |
1133 | err_out_unlock: |
1134 | rcu_read_unlock(); | |
838ab636 | 1135 | return ret; |
7af4cc3f HW |
1136 | } |
1137 | ||
7c8d4cb4 | 1138 | static const struct nfnl_callback nfqnl_cb[NFQNL_MSG_MAX] = { |
84a797dd | 1139 | [NFQNL_MSG_PACKET] = { .call_rcu = nfqnl_recv_unsupp, |
37d2e7a2 | 1140 | .attr_count = NFQA_MAX, }, |
84a797dd | 1141 | [NFQNL_MSG_VERDICT] = { .call_rcu = nfqnl_recv_verdict, |
5bf75853 PM |
1142 | .attr_count = NFQA_MAX, |
1143 | .policy = nfqa_verdict_policy }, | |
7af4cc3f | 1144 | [NFQNL_MSG_CONFIG] = { .call = nfqnl_recv_config, |
5bf75853 PM |
1145 | .attr_count = NFQA_CFG_MAX, |
1146 | .policy = nfqa_cfg_policy }, | |
97d32cf9 FW |
1147 | [NFQNL_MSG_VERDICT_BATCH]={ .call_rcu = nfqnl_recv_verdict_batch, |
1148 | .attr_count = NFQA_MAX, | |
1149 | .policy = nfqa_verdict_batch_policy }, | |
7af4cc3f HW |
1150 | }; |
1151 | ||
7c8d4cb4 | 1152 | static const struct nfnetlink_subsystem nfqnl_subsys = { |
7af4cc3f HW |
1153 | .name = "nf_queue", |
1154 | .subsys_id = NFNL_SUBSYS_QUEUE, | |
1155 | .cb_count = NFQNL_MSG_MAX, | |
7af4cc3f HW |
1156 | .cb = nfqnl_cb, |
1157 | }; | |
1158 | ||
838ab636 HW |
1159 | #ifdef CONFIG_PROC_FS |
1160 | struct iter_state { | |
e8179610 | 1161 | struct seq_net_private p; |
838ab636 HW |
1162 | unsigned int bucket; |
1163 | }; | |
1164 | ||
1165 | static struct hlist_node *get_first(struct seq_file *seq) | |
1166 | { | |
1167 | struct iter_state *st = seq->private; | |
e8179610 G |
1168 | struct net *net; |
1169 | struct nfnl_queue_net *q; | |
838ab636 HW |
1170 | |
1171 | if (!st) | |
1172 | return NULL; | |
1173 | ||
e8179610 G |
1174 | net = seq_file_net(seq); |
1175 | q = nfnl_queue_pernet(net); | |
838ab636 | 1176 | for (st->bucket = 0; st->bucket < INSTANCE_BUCKETS; st->bucket++) { |
e8179610 G |
1177 | if (!hlist_empty(&q->instance_table[st->bucket])) |
1178 | return q->instance_table[st->bucket].first; | |
838ab636 HW |
1179 | } |
1180 | return NULL; | |
1181 | } | |
1182 | ||
1183 | static struct hlist_node *get_next(struct seq_file *seq, struct hlist_node *h) | |
1184 | { | |
1185 | struct iter_state *st = seq->private; | |
e8179610 | 1186 | struct net *net = seq_file_net(seq); |
838ab636 HW |
1187 | |
1188 | h = h->next; | |
1189 | while (!h) { | |
e8179610 G |
1190 | struct nfnl_queue_net *q; |
1191 | ||
838ab636 HW |
1192 | if (++st->bucket >= INSTANCE_BUCKETS) |
1193 | return NULL; | |
1194 | ||
e8179610 G |
1195 | q = nfnl_queue_pernet(net); |
1196 | h = q->instance_table[st->bucket].first; | |
838ab636 HW |
1197 | } |
1198 | return h; | |
1199 | } | |
1200 | ||
1201 | static struct hlist_node *get_idx(struct seq_file *seq, loff_t pos) | |
1202 | { | |
1203 | struct hlist_node *head; | |
1204 | head = get_first(seq); | |
1205 | ||
1206 | if (head) | |
1207 | while (pos && (head = get_next(seq, head))) | |
1208 | pos--; | |
1209 | return pos ? NULL : head; | |
1210 | } | |
1211 | ||
e8179610 G |
1212 | static void *seq_start(struct seq_file *s, loff_t *pos) |
1213 | __acquires(nfnl_queue_pernet(seq_file_net(s))->instances_lock) | |
838ab636 | 1214 | { |
e8179610 G |
1215 | spin_lock(&nfnl_queue_pernet(seq_file_net(s))->instances_lock); |
1216 | return get_idx(s, *pos); | |
838ab636 HW |
1217 | } |
1218 | ||
1219 | static void *seq_next(struct seq_file *s, void *v, loff_t *pos) | |
1220 | { | |
1221 | (*pos)++; | |
1222 | return get_next(s, v); | |
1223 | } | |
1224 | ||
1225 | static void seq_stop(struct seq_file *s, void *v) | |
e8179610 | 1226 | __releases(nfnl_queue_pernet(seq_file_net(s))->instances_lock) |
838ab636 | 1227 | { |
e8179610 | 1228 | spin_unlock(&nfnl_queue_pernet(seq_file_net(s))->instances_lock); |
838ab636 HW |
1229 | } |
1230 | ||
1231 | static int seq_show(struct seq_file *s, void *v) | |
1232 | { | |
1233 | const struct nfqnl_instance *inst = v; | |
1234 | ||
1235 | return seq_printf(s, "%5d %6d %5d %1d %5d %5d %5d %8d %2d\n", | |
1236 | inst->queue_num, | |
15e47304 | 1237 | inst->peer_portid, inst->queue_total, |
838ab636 HW |
1238 | inst->copy_mode, inst->copy_range, |
1239 | inst->queue_dropped, inst->queue_user_dropped, | |
5863702a | 1240 | inst->id_sequence, 1); |
838ab636 HW |
1241 | } |
1242 | ||
56b3d975 | 1243 | static const struct seq_operations nfqnl_seq_ops = { |
838ab636 HW |
1244 | .start = seq_start, |
1245 | .next = seq_next, | |
1246 | .stop = seq_stop, | |
1247 | .show = seq_show, | |
1248 | }; | |
1249 | ||
1250 | static int nfqnl_open(struct inode *inode, struct file *file) | |
1251 | { | |
e8179610 | 1252 | return seq_open_net(inode, file, &nfqnl_seq_ops, |
e2da5913 | 1253 | sizeof(struct iter_state)); |
838ab636 HW |
1254 | } |
1255 | ||
da7071d7 | 1256 | static const struct file_operations nfqnl_file_ops = { |
838ab636 HW |
1257 | .owner = THIS_MODULE, |
1258 | .open = nfqnl_open, | |
1259 | .read = seq_read, | |
1260 | .llseek = seq_lseek, | |
e8179610 | 1261 | .release = seq_release_net, |
838ab636 HW |
1262 | }; |
1263 | ||
1264 | #endif /* PROC_FS */ | |
1265 | ||
e8179610 | 1266 | static int __net_init nfnl_queue_net_init(struct net *net) |
7af4cc3f | 1267 | { |
e8179610 G |
1268 | unsigned int i; |
1269 | struct nfnl_queue_net *q = nfnl_queue_pernet(net); | |
601e68e1 | 1270 | |
838ab636 | 1271 | for (i = 0; i < INSTANCE_BUCKETS; i++) |
e8179610 G |
1272 | INIT_HLIST_HEAD(&q->instance_table[i]); |
1273 | ||
1274 | spin_lock_init(&q->instances_lock); | |
1275 | ||
1276 | #ifdef CONFIG_PROC_FS | |
1277 | if (!proc_create("nfnetlink_queue", 0440, | |
1278 | net->nf.proc_netfilter, &nfqnl_file_ops)) | |
1279 | return -ENOMEM; | |
1280 | #endif | |
1281 | return 0; | |
1282 | } | |
1283 | ||
1284 | static void __net_exit nfnl_queue_net_exit(struct net *net) | |
1285 | { | |
1286 | remove_proc_entry("nfnetlink_queue", net->nf.proc_netfilter); | |
1287 | } | |
1288 | ||
1289 | static struct pernet_operations nfnl_queue_net_ops = { | |
1290 | .init = nfnl_queue_net_init, | |
1291 | .exit = nfnl_queue_net_exit, | |
1292 | .id = &nfnl_queue_net_id, | |
1293 | .size = sizeof(struct nfnl_queue_net), | |
1294 | }; | |
1295 | ||
1296 | static int __init nfnetlink_queue_init(void) | |
1297 | { | |
1298 | int status = -ENOMEM; | |
838ab636 | 1299 | |
7af4cc3f HW |
1300 | netlink_register_notifier(&nfqnl_rtnl_notifier); |
1301 | status = nfnetlink_subsys_register(&nfqnl_subsys); | |
1302 | if (status < 0) { | |
e8179610 | 1303 | pr_err("nf_queue: failed to create netlink socket\n"); |
7af4cc3f HW |
1304 | goto cleanup_netlink_notifier; |
1305 | } | |
1306 | ||
e8179610 G |
1307 | status = register_pernet_subsys(&nfnl_queue_net_ops); |
1308 | if (status < 0) { | |
1309 | pr_err("nf_queue: failed to register pernet ops\n"); | |
838ab636 | 1310 | goto cleanup_subsys; |
e8179610 | 1311 | } |
7af4cc3f | 1312 | register_netdevice_notifier(&nfqnl_dev_notifier); |
0360ae41 | 1313 | nf_register_queue_handler(&nfqh); |
7af4cc3f HW |
1314 | return status; |
1315 | ||
838ab636 | 1316 | cleanup_subsys: |
7af4cc3f | 1317 | nfnetlink_subsys_unregister(&nfqnl_subsys); |
7af4cc3f HW |
1318 | cleanup_netlink_notifier: |
1319 | netlink_unregister_notifier(&nfqnl_rtnl_notifier); | |
1320 | return status; | |
1321 | } | |
1322 | ||
65b4b4e8 | 1323 | static void __exit nfnetlink_queue_fini(void) |
7af4cc3f | 1324 | { |
0360ae41 | 1325 | nf_unregister_queue_handler(); |
32292a7f | 1326 | unregister_netdevice_notifier(&nfqnl_dev_notifier); |
e8179610 | 1327 | unregister_pernet_subsys(&nfnl_queue_net_ops); |
32292a7f PM |
1328 | nfnetlink_subsys_unregister(&nfqnl_subsys); |
1329 | netlink_unregister_notifier(&nfqnl_rtnl_notifier); | |
67137f3c JDB |
1330 | |
1331 | rcu_barrier(); /* Wait for completion of call_rcu()'s */ | |
7af4cc3f HW |
1332 | } |
1333 | ||
1334 | MODULE_DESCRIPTION("netfilter packet queue handler"); | |
1335 | MODULE_AUTHOR("Harald Welte <laforge@netfilter.org>"); | |
1336 | MODULE_LICENSE("GPL"); | |
1337 | MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_QUEUE); | |
1338 | ||
65b4b4e8 AM |
1339 | module_init(nfnetlink_queue_init); |
1340 | module_exit(nfnetlink_queue_fini); |