Commit | Line | Data |
---|---|---|
7af4cc3f HW |
1 | /* |
2 | * This is a module which is used for queueing packets and communicating with | |
67137f3c | 3 | * userspace via nfnetlink. |
7af4cc3f HW |
4 | * |
5 | * (C) 2005 by Harald Welte <laforge@netfilter.org> | |
4ad9d4fa | 6 | * (C) 2007 by Patrick McHardy <kaber@trash.net> |
7af4cc3f HW |
7 | * |
8 | * Based on the old ipv4-only ip_queue.c: | |
9 | * (C) 2000-2002 James Morris <jmorris@intercode.com.au> | |
10 | * (C) 2003-2005 Netfilter Core Team <coreteam@netfilter.org> | |
11 | * | |
12 | * This program is free software; you can redistribute it and/or modify | |
13 | * it under the terms of the GNU General Public License version 2 as | |
14 | * published by the Free Software Foundation. | |
15 | * | |
16 | */ | |
17 | #include <linux/module.h> | |
18 | #include <linux/skbuff.h> | |
19 | #include <linux/init.h> | |
20 | #include <linux/spinlock.h> | |
5a0e3ad6 | 21 | #include <linux/slab.h> |
7af4cc3f HW |
22 | #include <linux/notifier.h> |
23 | #include <linux/netdevice.h> | |
24 | #include <linux/netfilter.h> | |
838ab636 | 25 | #include <linux/proc_fs.h> |
7af4cc3f HW |
26 | #include <linux/netfilter_ipv4.h> |
27 | #include <linux/netfilter_ipv6.h> | |
c737b7c4 | 28 | #include <linux/netfilter_bridge.h> |
7af4cc3f HW |
29 | #include <linux/netfilter/nfnetlink.h> |
30 | #include <linux/netfilter/nfnetlink_queue.h> | |
31 | #include <linux/list.h> | |
32 | #include <net/sock.h> | |
83111e7f | 33 | #include <net/tcp_states.h> |
c01cd429 | 34 | #include <net/netfilter/nf_queue.h> |
e8179610 | 35 | #include <net/netns/generic.h> |
7c622345 | 36 | #include <net/netfilter/nfnetlink_queue.h> |
7af4cc3f | 37 | |
60063497 | 38 | #include <linux/atomic.h> |
7af4cc3f | 39 | |
1109a90c | 40 | #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER) |
fbcd923c HW |
41 | #include "../bridge/br_private.h" |
42 | #endif | |
43 | ||
7af4cc3f HW |
44 | #define NFQNL_QMAX_DEFAULT 1024 |
45 | ||
9cefbbc9 FW |
46 | /* We're using struct nlattr which has 16bit nla_len. Note that nla_len |
47 | * includes the header length. Thus, the maximum packet length that we | |
48 | * support is 65531 bytes. We send truncated packets if the specified length | |
49 | * is larger than that. Userspace can check for presence of NFQA_CAP_LEN | |
50 | * attribute to detect truncation. | |
51 | */ | |
52 | #define NFQNL_MAX_COPY_RANGE (0xffff - NLA_HDRLEN) | |
53 | ||
7af4cc3f HW |
54 | struct nfqnl_instance { |
55 | struct hlist_node hlist; /* global list of queues */ | |
9872bec7 | 56 | struct rcu_head rcu; |
7af4cc3f | 57 | |
15e47304 | 58 | int peer_portid; |
7af4cc3f HW |
59 | unsigned int queue_maxlen; |
60 | unsigned int copy_range; | |
7af4cc3f HW |
61 | unsigned int queue_dropped; |
62 | unsigned int queue_user_dropped; | |
63 | ||
7af4cc3f HW |
64 | |
65 | u_int16_t queue_num; /* number of this queue */ | |
66 | u_int8_t copy_mode; | |
fdb694a0 | 67 | u_int32_t flags; /* Set using NFQA_CFG_FLAGS */ |
c463ac97 ED |
68 | /* |
69 | * Following fields are dirtied for each queued packet, | |
70 | * keep them in same cache line if possible. | |
71 | */ | |
72 | spinlock_t lock; | |
73 | unsigned int queue_total; | |
5863702a | 74 | unsigned int id_sequence; /* 'sequence' of pkt ids */ |
7af4cc3f HW |
75 | struct list_head queue_list; /* packets in queue */ |
76 | }; | |
77 | ||
02f014d8 | 78 | typedef int (*nfqnl_cmpfn)(struct nf_queue_entry *, unsigned long); |
7af4cc3f | 79 | |
e8179610 | 80 | static int nfnl_queue_net_id __read_mostly; |
7af4cc3f | 81 | |
7af4cc3f | 82 | #define INSTANCE_BUCKETS 16 |
e8179610 G |
83 | struct nfnl_queue_net { |
84 | spinlock_t instances_lock; | |
85 | struct hlist_head instance_table[INSTANCE_BUCKETS]; | |
86 | }; | |
87 | ||
88 | static struct nfnl_queue_net *nfnl_queue_pernet(struct net *net) | |
89 | { | |
90 | return net_generic(net, nfnl_queue_net_id); | |
91 | } | |
7af4cc3f HW |
92 | |
93 | static inline u_int8_t instance_hashfn(u_int16_t queue_num) | |
94 | { | |
1cdb0905 | 95 | return ((queue_num >> 8) ^ queue_num) % INSTANCE_BUCKETS; |
7af4cc3f HW |
96 | } |
97 | ||
98 | static struct nfqnl_instance * | |
e8179610 | 99 | instance_lookup(struct nfnl_queue_net *q, u_int16_t queue_num) |
7af4cc3f HW |
100 | { |
101 | struct hlist_head *head; | |
7af4cc3f HW |
102 | struct nfqnl_instance *inst; |
103 | ||
e8179610 | 104 | head = &q->instance_table[instance_hashfn(queue_num)]; |
b67bfe0d | 105 | hlist_for_each_entry_rcu(inst, head, hlist) { |
7af4cc3f HW |
106 | if (inst->queue_num == queue_num) |
107 | return inst; | |
108 | } | |
109 | return NULL; | |
110 | } | |
111 | ||
7af4cc3f | 112 | static struct nfqnl_instance * |
e8179610 G |
113 | instance_create(struct nfnl_queue_net *q, u_int16_t queue_num, |
114 | int portid) | |
7af4cc3f | 115 | { |
baab2ce7 | 116 | struct nfqnl_instance *inst; |
9872bec7 | 117 | unsigned int h; |
baab2ce7 | 118 | int err; |
7af4cc3f | 119 | |
e8179610 G |
120 | spin_lock(&q->instances_lock); |
121 | if (instance_lookup(q, queue_num)) { | |
baab2ce7 | 122 | err = -EEXIST; |
7af4cc3f | 123 | goto out_unlock; |
baab2ce7 | 124 | } |
7af4cc3f | 125 | |
10dfdc69 | 126 | inst = kzalloc(sizeof(*inst), GFP_ATOMIC); |
baab2ce7 PM |
127 | if (!inst) { |
128 | err = -ENOMEM; | |
7af4cc3f | 129 | goto out_unlock; |
baab2ce7 | 130 | } |
7af4cc3f | 131 | |
7af4cc3f | 132 | inst->queue_num = queue_num; |
15e47304 | 133 | inst->peer_portid = portid; |
7af4cc3f | 134 | inst->queue_maxlen = NFQNL_QMAX_DEFAULT; |
9cefbbc9 | 135 | inst->copy_range = NFQNL_MAX_COPY_RANGE; |
7af4cc3f | 136 | inst->copy_mode = NFQNL_COPY_NONE; |
181a46a5 | 137 | spin_lock_init(&inst->lock); |
7af4cc3f HW |
138 | INIT_LIST_HEAD(&inst->queue_list); |
139 | ||
baab2ce7 PM |
140 | if (!try_module_get(THIS_MODULE)) { |
141 | err = -EAGAIN; | |
7af4cc3f | 142 | goto out_free; |
baab2ce7 | 143 | } |
7af4cc3f | 144 | |
9872bec7 | 145 | h = instance_hashfn(queue_num); |
e8179610 | 146 | hlist_add_head_rcu(&inst->hlist, &q->instance_table[h]); |
7af4cc3f | 147 | |
e8179610 | 148 | spin_unlock(&q->instances_lock); |
7af4cc3f | 149 | |
7af4cc3f HW |
150 | return inst; |
151 | ||
152 | out_free: | |
153 | kfree(inst); | |
154 | out_unlock: | |
e8179610 | 155 | spin_unlock(&q->instances_lock); |
baab2ce7 | 156 | return ERR_PTR(err); |
7af4cc3f HW |
157 | } |
158 | ||
b43d8d85 PM |
159 | static void nfqnl_flush(struct nfqnl_instance *queue, nfqnl_cmpfn cmpfn, |
160 | unsigned long data); | |
7af4cc3f HW |
161 | |
162 | static void | |
9872bec7 | 163 | instance_destroy_rcu(struct rcu_head *head) |
7af4cc3f | 164 | { |
9872bec7 PM |
165 | struct nfqnl_instance *inst = container_of(head, struct nfqnl_instance, |
166 | rcu); | |
7af4cc3f | 167 | |
b43d8d85 | 168 | nfqnl_flush(inst, NULL, 0); |
9872bec7 | 169 | kfree(inst); |
7af4cc3f HW |
170 | module_put(THIS_MODULE); |
171 | } | |
172 | ||
9872bec7 | 173 | static void |
7af4cc3f HW |
174 | __instance_destroy(struct nfqnl_instance *inst) |
175 | { | |
9872bec7 PM |
176 | hlist_del_rcu(&inst->hlist); |
177 | call_rcu(&inst->rcu, instance_destroy_rcu); | |
7af4cc3f HW |
178 | } |
179 | ||
9872bec7 | 180 | static void |
e8179610 | 181 | instance_destroy(struct nfnl_queue_net *q, struct nfqnl_instance *inst) |
7af4cc3f | 182 | { |
e8179610 | 183 | spin_lock(&q->instances_lock); |
9872bec7 | 184 | __instance_destroy(inst); |
e8179610 | 185 | spin_unlock(&q->instances_lock); |
7af4cc3f HW |
186 | } |
187 | ||
7af4cc3f | 188 | static inline void |
02f014d8 | 189 | __enqueue_entry(struct nfqnl_instance *queue, struct nf_queue_entry *entry) |
7af4cc3f | 190 | { |
0ac41e81 | 191 | list_add_tail(&entry->list, &queue->queue_list); |
7af4cc3f HW |
192 | queue->queue_total++; |
193 | } | |
194 | ||
97d32cf9 FW |
195 | static void |
196 | __dequeue_entry(struct nfqnl_instance *queue, struct nf_queue_entry *entry) | |
197 | { | |
198 | list_del(&entry->list); | |
199 | queue->queue_total--; | |
200 | } | |
201 | ||
02f014d8 | 202 | static struct nf_queue_entry * |
b43d8d85 | 203 | find_dequeue_entry(struct nfqnl_instance *queue, unsigned int id) |
7af4cc3f | 204 | { |
02f014d8 | 205 | struct nf_queue_entry *entry = NULL, *i; |
601e68e1 | 206 | |
7af4cc3f | 207 | spin_lock_bh(&queue->lock); |
b43d8d85 PM |
208 | |
209 | list_for_each_entry(i, &queue->queue_list, list) { | |
210 | if (i->id == id) { | |
211 | entry = i; | |
212 | break; | |
213 | } | |
214 | } | |
215 | ||
97d32cf9 FW |
216 | if (entry) |
217 | __dequeue_entry(queue, entry); | |
b43d8d85 | 218 | |
7af4cc3f HW |
219 | spin_unlock_bh(&queue->lock); |
220 | ||
221 | return entry; | |
222 | } | |
223 | ||
224 | static void | |
b43d8d85 | 225 | nfqnl_flush(struct nfqnl_instance *queue, nfqnl_cmpfn cmpfn, unsigned long data) |
7af4cc3f | 226 | { |
02f014d8 | 227 | struct nf_queue_entry *entry, *next; |
b43d8d85 | 228 | |
7af4cc3f | 229 | spin_lock_bh(&queue->lock); |
b43d8d85 PM |
230 | list_for_each_entry_safe(entry, next, &queue->queue_list, list) { |
231 | if (!cmpfn || cmpfn(entry, data)) { | |
232 | list_del(&entry->list); | |
233 | queue->queue_total--; | |
4b3d15ef | 234 | nf_reinject(entry, NF_DROP); |
b43d8d85 PM |
235 | } |
236 | } | |
7af4cc3f HW |
237 | spin_unlock_bh(&queue->lock); |
238 | } | |
239 | ||
496e4ae7 FW |
240 | static int |
241 | nfqnl_put_packet_info(struct sk_buff *nlskb, struct sk_buff *packet, | |
242 | bool csum_verify) | |
7237190d FW |
243 | { |
244 | __u32 flags = 0; | |
245 | ||
246 | if (packet->ip_summed == CHECKSUM_PARTIAL) | |
247 | flags = NFQA_SKB_CSUMNOTREADY; | |
496e4ae7 FW |
248 | else if (csum_verify) |
249 | flags = NFQA_SKB_CSUM_NOTVERIFIED; | |
250 | ||
7237190d FW |
251 | if (skb_is_gso(packet)) |
252 | flags |= NFQA_SKB_GSO; | |
253 | ||
254 | return flags ? nla_put_be32(nlskb, NFQA_SKB_INFO, htonl(flags)) : 0; | |
255 | } | |
256 | ||
08c0cad6 VG |
257 | static int nfqnl_put_sk_uidgid(struct sk_buff *skb, struct sock *sk) |
258 | { | |
259 | const struct cred *cred; | |
260 | ||
a8399231 | 261 | if (!sk_fullsock(sk)) |
08c0cad6 VG |
262 | return 0; |
263 | ||
264 | read_lock_bh(&sk->sk_callback_lock); | |
265 | if (sk->sk_socket && sk->sk_socket->file) { | |
266 | cred = sk->sk_socket->file->f_cred; | |
267 | if (nla_put_be32(skb, NFQA_UID, | |
268 | htonl(from_kuid_munged(&init_user_ns, cred->fsuid)))) | |
269 | goto nla_put_failure; | |
270 | if (nla_put_be32(skb, NFQA_GID, | |
271 | htonl(from_kgid_munged(&init_user_ns, cred->fsgid)))) | |
272 | goto nla_put_failure; | |
273 | } | |
274 | read_unlock_bh(&sk->sk_callback_lock); | |
275 | return 0; | |
276 | ||
277 | nla_put_failure: | |
278 | read_unlock_bh(&sk->sk_callback_lock); | |
279 | return -1; | |
280 | } | |
281 | ||
7af4cc3f | 282 | static struct sk_buff * |
74332687 | 283 | nfqnl_build_packet_message(struct net *net, struct nfqnl_instance *queue, |
5863702a ED |
284 | struct nf_queue_entry *entry, |
285 | __be32 **packet_id_ptr) | |
7af4cc3f | 286 | { |
7af4cc3f | 287 | size_t size; |
6ee584be | 288 | size_t data_len = 0, cap_len = 0; |
af2806f8 | 289 | unsigned int hlen = 0; |
7af4cc3f | 290 | struct sk_buff *skb; |
5863702a ED |
291 | struct nlattr *nla; |
292 | struct nfqnl_msg_packet_hdr *pmsg; | |
7af4cc3f HW |
293 | struct nlmsghdr *nlh; |
294 | struct nfgenmsg *nfmsg; | |
3e4ead4f JJ |
295 | struct sk_buff *entskb = entry->skb; |
296 | struct net_device *indev; | |
297 | struct net_device *outdev; | |
9cb01766 PNA |
298 | struct nf_conn *ct = NULL; |
299 | enum ip_conntrack_info uninitialized_var(ctinfo); | |
496e4ae7 | 300 | bool csum_verify; |
7af4cc3f | 301 | |
573ce260 | 302 | size = nlmsg_total_size(sizeof(struct nfgenmsg)) |
df6fb868 PM |
303 | + nla_total_size(sizeof(struct nfqnl_msg_packet_hdr)) |
304 | + nla_total_size(sizeof(u_int32_t)) /* ifindex */ | |
305 | + nla_total_size(sizeof(u_int32_t)) /* ifindex */ | |
1109a90c | 306 | #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER) |
df6fb868 PM |
307 | + nla_total_size(sizeof(u_int32_t)) /* ifindex */ |
308 | + nla_total_size(sizeof(u_int32_t)) /* ifindex */ | |
fbcd923c | 309 | #endif |
df6fb868 PM |
310 | + nla_total_size(sizeof(u_int32_t)) /* mark */ |
311 | + nla_total_size(sizeof(struct nfqnl_msg_packet_hw)) | |
7237190d | 312 | + nla_total_size(sizeof(u_int32_t)) /* skbinfo */ |
ae08ce00 ED |
313 | + nla_total_size(sizeof(u_int32_t)); /* cap_len */ |
314 | ||
315 | if (entskb->tstamp.tv64) | |
316 | size += nla_total_size(sizeof(struct nfqnl_msg_packet_timestamp)); | |
7af4cc3f | 317 | |
1d1de89b DM |
318 | if (entry->state.hook <= NF_INET_FORWARD || |
319 | (entry->state.hook == NF_INET_POST_ROUTING && entskb->sk == NULL)) | |
496e4ae7 FW |
320 | csum_verify = !skb_csum_unnecessary(entskb); |
321 | else | |
322 | csum_verify = false; | |
323 | ||
1d1de89b | 324 | outdev = entry->state.out; |
3e4ead4f | 325 | |
c463ac97 | 326 | switch ((enum nfqnl_config_mode)ACCESS_ONCE(queue->copy_mode)) { |
7af4cc3f HW |
327 | case NFQNL_COPY_META: |
328 | case NFQNL_COPY_NONE: | |
7af4cc3f | 329 | break; |
601e68e1 | 330 | |
7af4cc3f | 331 | case NFQNL_COPY_PACKET: |
00bd1cc2 FW |
332 | if (!(queue->flags & NFQA_CFG_F_GSO) && |
333 | entskb->ip_summed == CHECKSUM_PARTIAL && | |
c463ac97 | 334 | skb_checksum_help(entskb)) |
e7dfb09a | 335 | return NULL; |
c463ac97 ED |
336 | |
337 | data_len = ACCESS_ONCE(queue->copy_range); | |
9cefbbc9 | 338 | if (data_len > entskb->len) |
3e4ead4f | 339 | data_len = entskb->len; |
601e68e1 | 340 | |
af2806f8 TG |
341 | hlen = skb_zerocopy_headlen(entskb); |
342 | hlen = min_t(unsigned int, hlen, data_len); | |
ae08ce00 | 343 | size += sizeof(struct nlattr) + hlen; |
6ee584be | 344 | cap_len = entskb->len; |
7af4cc3f | 345 | break; |
7af4cc3f HW |
346 | } |
347 | ||
7c622345 PNA |
348 | if (queue->flags & NFQA_CFG_F_CONNTRACK) |
349 | ct = nfqnl_ct_get(entskb, &size, &ctinfo); | |
7af4cc3f | 350 | |
08c0cad6 VG |
351 | if (queue->flags & NFQA_CFG_F_UID_GID) { |
352 | size += (nla_total_size(sizeof(u_int32_t)) /* uid */ | |
353 | + nla_total_size(sizeof(u_int32_t))); /* gid */ | |
354 | } | |
355 | ||
74332687 | 356 | skb = nfnetlink_alloc_skb(net, size, queue->peer_portid, |
3ab1f683 | 357 | GFP_ATOMIC); |
36d5fe6a ZK |
358 | if (!skb) { |
359 | skb_tx_error(entskb); | |
3da07c0c | 360 | return NULL; |
36d5fe6a | 361 | } |
601e68e1 | 362 | |
3da07c0c | 363 | nlh = nlmsg_put(skb, 0, 0, |
7af4cc3f | 364 | NFNL_SUBSYS_QUEUE << 8 | NFQNL_MSG_PACKET, |
3da07c0c DM |
365 | sizeof(struct nfgenmsg), 0); |
366 | if (!nlh) { | |
36d5fe6a | 367 | skb_tx_error(entskb); |
3da07c0c DM |
368 | kfree_skb(skb); |
369 | return NULL; | |
370 | } | |
371 | nfmsg = nlmsg_data(nlh); | |
1d1de89b | 372 | nfmsg->nfgen_family = entry->state.pf; |
7af4cc3f HW |
373 | nfmsg->version = NFNETLINK_V0; |
374 | nfmsg->res_id = htons(queue->queue_num); | |
375 | ||
5863702a ED |
376 | nla = __nla_reserve(skb, NFQA_PACKET_HDR, sizeof(*pmsg)); |
377 | pmsg = nla_data(nla); | |
378 | pmsg->hw_protocol = entskb->protocol; | |
1d1de89b | 379 | pmsg->hook = entry->state.hook; |
5863702a | 380 | *packet_id_ptr = &pmsg->packet_id; |
7af4cc3f | 381 | |
1d1de89b | 382 | indev = entry->state.in; |
3e4ead4f | 383 | if (indev) { |
1109a90c | 384 | #if !IS_ENABLED(CONFIG_BRIDGE_NETFILTER) |
a447189e DM |
385 | if (nla_put_be32(skb, NFQA_IFINDEX_INDEV, htonl(indev->ifindex))) |
386 | goto nla_put_failure; | |
fbcd923c | 387 | #else |
1d1de89b | 388 | if (entry->state.pf == PF_BRIDGE) { |
fbcd923c | 389 | /* Case 1: indev is physical input device, we need to |
601e68e1 | 390 | * look for bridge group (when called from |
fbcd923c | 391 | * netfilter_bridge) */ |
a447189e DM |
392 | if (nla_put_be32(skb, NFQA_IFINDEX_PHYSINDEV, |
393 | htonl(indev->ifindex)) || | |
fbcd923c | 394 | /* this is the bridge group "brX" */ |
f350a0a8 | 395 | /* rcu_read_lock()ed by __nf_queue */ |
a447189e DM |
396 | nla_put_be32(skb, NFQA_IFINDEX_INDEV, |
397 | htonl(br_port_get_rcu(indev)->br->dev->ifindex))) | |
398 | goto nla_put_failure; | |
fbcd923c | 399 | } else { |
c737b7c4 FW |
400 | int physinif; |
401 | ||
fbcd923c HW |
402 | /* Case 2: indev is bridge group, we need to look for |
403 | * physical device (when called from ipv4) */ | |
a447189e DM |
404 | if (nla_put_be32(skb, NFQA_IFINDEX_INDEV, |
405 | htonl(indev->ifindex))) | |
406 | goto nla_put_failure; | |
c737b7c4 FW |
407 | |
408 | physinif = nf_bridge_get_physinif(entskb); | |
409 | if (physinif && | |
a447189e | 410 | nla_put_be32(skb, NFQA_IFINDEX_PHYSINDEV, |
c737b7c4 | 411 | htonl(physinif))) |
a447189e | 412 | goto nla_put_failure; |
fbcd923c HW |
413 | } |
414 | #endif | |
7af4cc3f HW |
415 | } |
416 | ||
3e4ead4f | 417 | if (outdev) { |
1109a90c | 418 | #if !IS_ENABLED(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 |
1d1de89b | 422 | if (entry->state.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 | 433 | } else { |
c737b7c4 FW |
434 | int physoutif; |
435 | ||
fbcd923c HW |
436 | /* Case 2: outdev is bridge group, we need to look for |
437 | * physical output device (when called from ipv4) */ | |
a447189e DM |
438 | if (nla_put_be32(skb, NFQA_IFINDEX_OUTDEV, |
439 | htonl(outdev->ifindex))) | |
440 | goto nla_put_failure; | |
c737b7c4 FW |
441 | |
442 | physoutif = nf_bridge_get_physoutif(entskb); | |
443 | if (physoutif && | |
a447189e | 444 | nla_put_be32(skb, NFQA_IFINDEX_PHYSOUTDEV, |
c737b7c4 | 445 | htonl(physoutif))) |
a447189e | 446 | goto nla_put_failure; |
fbcd923c HW |
447 | } |
448 | #endif | |
7af4cc3f HW |
449 | } |
450 | ||
a447189e DM |
451 | if (entskb->mark && |
452 | nla_put_be32(skb, NFQA_MARK, htonl(entskb->mark))) | |
453 | goto nla_put_failure; | |
7af4cc3f | 454 | |
2c38de4c NC |
455 | if (indev && entskb->dev && |
456 | entskb->mac_header != entskb->network_header) { | |
7af4cc3f | 457 | struct nfqnl_msg_packet_hw phw; |
e4d091d7 DC |
458 | int len; |
459 | ||
460 | memset(&phw, 0, sizeof(phw)); | |
461 | len = dev_parse_header(entskb, phw.hw_addr); | |
b95cce35 SH |
462 | if (len) { |
463 | phw.hw_addrlen = htons(len); | |
a447189e DM |
464 | if (nla_put(skb, NFQA_HWADDR, sizeof(phw), &phw)) |
465 | goto nla_put_failure; | |
b95cce35 | 466 | } |
7af4cc3f HW |
467 | } |
468 | ||
b7aa0bf7 | 469 | if (entskb->tstamp.tv64) { |
7af4cc3f | 470 | struct nfqnl_msg_packet_timestamp ts; |
b7aa0bf7 ED |
471 | struct timeval tv = ktime_to_timeval(entskb->tstamp); |
472 | ts.sec = cpu_to_be64(tv.tv_sec); | |
473 | ts.usec = cpu_to_be64(tv.tv_usec); | |
7af4cc3f | 474 | |
a447189e DM |
475 | if (nla_put(skb, NFQA_TIMESTAMP, sizeof(ts), &ts)) |
476 | goto nla_put_failure; | |
7af4cc3f HW |
477 | } |
478 | ||
08c0cad6 VG |
479 | if ((queue->flags & NFQA_CFG_F_UID_GID) && entskb->sk && |
480 | nfqnl_put_sk_uidgid(skb, entskb->sk) < 0) | |
481 | goto nla_put_failure; | |
482 | ||
ae08ce00 ED |
483 | if (ct && nfqnl_ct_put(skb, ct, ctinfo) < 0) |
484 | goto nla_put_failure; | |
485 | ||
7f87712c FW |
486 | if (cap_len > data_len && |
487 | nla_put_be32(skb, NFQA_CAP_LEN, htonl(cap_len))) | |
ae08ce00 ED |
488 | goto nla_put_failure; |
489 | ||
496e4ae7 | 490 | if (nfqnl_put_packet_info(skb, entskb, csum_verify)) |
7237190d FW |
491 | goto nla_put_failure; |
492 | ||
7af4cc3f | 493 | if (data_len) { |
df6fb868 | 494 | struct nlattr *nla; |
7af4cc3f | 495 | |
ae08ce00 ED |
496 | if (skb_tailroom(skb) < sizeof(*nla) + hlen) |
497 | goto nla_put_failure; | |
7af4cc3f | 498 | |
ae08ce00 | 499 | nla = (struct nlattr *)skb_put(skb, sizeof(*nla)); |
df6fb868 | 500 | nla->nla_type = NFQA_PAYLOAD; |
ae08ce00 | 501 | nla->nla_len = nla_attr_size(data_len); |
7af4cc3f | 502 | |
36d5fe6a ZK |
503 | if (skb_zerocopy(skb, entskb, data_len, hlen)) |
504 | goto nla_put_failure; | |
7af4cc3f | 505 | } |
601e68e1 | 506 | |
ae08ce00 | 507 | nlh->nlmsg_len = skb->len; |
7af4cc3f HW |
508 | return skb; |
509 | ||
df6fb868 | 510 | nla_put_failure: |
36d5fe6a | 511 | skb_tx_error(entskb); |
a6729955 | 512 | kfree_skb(skb); |
e87cc472 | 513 | net_err_ratelimited("nf_queue: error creating packet message\n"); |
7af4cc3f HW |
514 | return NULL; |
515 | } | |
516 | ||
517 | static int | |
a5fedd43 FW |
518 | __nfqnl_enqueue_packet(struct net *net, struct nfqnl_instance *queue, |
519 | struct nf_queue_entry *entry) | |
7af4cc3f | 520 | { |
7af4cc3f | 521 | struct sk_buff *nskb; |
f1585086 | 522 | int err = -ENOBUFS; |
5863702a | 523 | __be32 *packet_id_ptr; |
fdb694a0 | 524 | int failopen = 0; |
7af4cc3f | 525 | |
74332687 | 526 | nskb = nfqnl_build_packet_message(net, queue, entry, &packet_id_ptr); |
f1585086 FW |
527 | if (nskb == NULL) { |
528 | err = -ENOMEM; | |
0ef0f465 | 529 | goto err_out; |
f1585086 | 530 | } |
7af4cc3f | 531 | spin_lock_bh(&queue->lock); |
601e68e1 | 532 | |
7af4cc3f | 533 | if (queue->queue_total >= queue->queue_maxlen) { |
fdb694a0 KK |
534 | if (queue->flags & NFQA_CFG_F_FAIL_OPEN) { |
535 | failopen = 1; | |
536 | err = 0; | |
537 | } else { | |
538 | queue->queue_dropped++; | |
539 | net_warn_ratelimited("nf_queue: full at %d entries, dropping packets(s)\n", | |
540 | queue->queue_total); | |
541 | } | |
7af4cc3f HW |
542 | goto err_out_free_nskb; |
543 | } | |
5863702a ED |
544 | entry->id = ++queue->id_sequence; |
545 | *packet_id_ptr = htonl(entry->id); | |
7af4cc3f HW |
546 | |
547 | /* nfnetlink_unicast will either free the nskb or add it to a socket */ | |
e8179610 | 548 | err = nfnetlink_unicast(nskb, net, queue->peer_portid, MSG_DONTWAIT); |
0ef0f465 | 549 | if (err < 0) { |
601e68e1 | 550 | queue->queue_user_dropped++; |
7af4cc3f HW |
551 | goto err_out_unlock; |
552 | } | |
553 | ||
554 | __enqueue_entry(queue, entry); | |
555 | ||
556 | spin_unlock_bh(&queue->lock); | |
0ef0f465 | 557 | return 0; |
7af4cc3f HW |
558 | |
559 | err_out_free_nskb: | |
601e68e1 | 560 | kfree_skb(nskb); |
7af4cc3f HW |
561 | err_out_unlock: |
562 | spin_unlock_bh(&queue->lock); | |
fdb694a0 KK |
563 | if (failopen) |
564 | nf_reinject(entry, NF_ACCEPT); | |
0ef0f465 | 565 | err_out: |
f1585086 | 566 | return err; |
7af4cc3f HW |
567 | } |
568 | ||
a5fedd43 FW |
569 | static struct nf_queue_entry * |
570 | nf_queue_entry_dup(struct nf_queue_entry *e) | |
571 | { | |
572 | struct nf_queue_entry *entry = kmemdup(e, e->size, GFP_ATOMIC); | |
573 | if (entry) { | |
574 | if (nf_queue_entry_get_refs(entry)) | |
575 | return entry; | |
576 | kfree(entry); | |
577 | } | |
578 | return NULL; | |
579 | } | |
580 | ||
1109a90c | 581 | #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER) |
a5fedd43 FW |
582 | /* When called from bridge netfilter, skb->data must point to MAC header |
583 | * before calling skb_gso_segment(). Else, original MAC header is lost | |
584 | * and segmented skbs will be sent to wrong destination. | |
585 | */ | |
586 | static void nf_bridge_adjust_skb_data(struct sk_buff *skb) | |
587 | { | |
588 | if (skb->nf_bridge) | |
589 | __skb_push(skb, skb->network_header - skb->mac_header); | |
590 | } | |
591 | ||
592 | static void nf_bridge_adjust_segmented_data(struct sk_buff *skb) | |
593 | { | |
594 | if (skb->nf_bridge) | |
595 | __skb_pull(skb, skb->network_header - skb->mac_header); | |
596 | } | |
597 | #else | |
598 | #define nf_bridge_adjust_skb_data(s) do {} while (0) | |
599 | #define nf_bridge_adjust_segmented_data(s) do {} while (0) | |
600 | #endif | |
601 | ||
602 | static void free_entry(struct nf_queue_entry *entry) | |
603 | { | |
604 | nf_queue_entry_release_refs(entry); | |
605 | kfree(entry); | |
606 | } | |
607 | ||
608 | static int | |
609 | __nfqnl_enqueue_packet_gso(struct net *net, struct nfqnl_instance *queue, | |
610 | struct sk_buff *skb, struct nf_queue_entry *entry) | |
611 | { | |
612 | int ret = -ENOMEM; | |
613 | struct nf_queue_entry *entry_seg; | |
614 | ||
615 | nf_bridge_adjust_segmented_data(skb); | |
616 | ||
617 | if (skb->next == NULL) { /* last packet, no need to copy entry */ | |
618 | struct sk_buff *gso_skb = entry->skb; | |
619 | entry->skb = skb; | |
620 | ret = __nfqnl_enqueue_packet(net, queue, entry); | |
621 | if (ret) | |
622 | entry->skb = gso_skb; | |
623 | return ret; | |
624 | } | |
625 | ||
626 | skb->next = NULL; | |
627 | ||
628 | entry_seg = nf_queue_entry_dup(entry); | |
629 | if (entry_seg) { | |
630 | entry_seg->skb = skb; | |
631 | ret = __nfqnl_enqueue_packet(net, queue, entry_seg); | |
632 | if (ret) | |
633 | free_entry(entry_seg); | |
634 | } | |
635 | return ret; | |
636 | } | |
637 | ||
638 | static int | |
639 | nfqnl_enqueue_packet(struct nf_queue_entry *entry, unsigned int queuenum) | |
640 | { | |
641 | unsigned int queued; | |
642 | struct nfqnl_instance *queue; | |
643 | struct sk_buff *skb, *segs; | |
644 | int err = -ENOBUFS; | |
1d1de89b DM |
645 | struct net *net = dev_net(entry->state.in ? |
646 | entry->state.in : entry->state.out); | |
a5fedd43 FW |
647 | struct nfnl_queue_net *q = nfnl_queue_pernet(net); |
648 | ||
649 | /* rcu_read_lock()ed by nf_hook_slow() */ | |
650 | queue = instance_lookup(q, queuenum); | |
651 | if (!queue) | |
652 | return -ESRCH; | |
653 | ||
654 | if (queue->copy_mode == NFQNL_COPY_NONE) | |
655 | return -EINVAL; | |
656 | ||
a5fedd43 FW |
657 | skb = entry->skb; |
658 | ||
1d1de89b | 659 | switch (entry->state.pf) { |
a5fedd43 FW |
660 | case NFPROTO_IPV4: |
661 | skb->protocol = htons(ETH_P_IP); | |
662 | break; | |
663 | case NFPROTO_IPV6: | |
664 | skb->protocol = htons(ETH_P_IPV6); | |
665 | break; | |
666 | } | |
667 | ||
7b8dfe28 PNA |
668 | if ((queue->flags & NFQA_CFG_F_GSO) || !skb_is_gso(skb)) |
669 | return __nfqnl_enqueue_packet(net, queue, entry); | |
670 | ||
a5fedd43 FW |
671 | nf_bridge_adjust_skb_data(skb); |
672 | segs = skb_gso_segment(skb, 0); | |
673 | /* Does not use PTR_ERR to limit the number of error codes that can be | |
674 | * returned by nf_queue. For instance, callers rely on -ECANCELED to | |
675 | * mean 'ignore this hook'. | |
676 | */ | |
330966e5 | 677 | if (IS_ERR_OR_NULL(segs)) |
a5fedd43 FW |
678 | goto out_err; |
679 | queued = 0; | |
680 | err = 0; | |
681 | do { | |
682 | struct sk_buff *nskb = segs->next; | |
683 | if (err == 0) | |
684 | err = __nfqnl_enqueue_packet_gso(net, queue, | |
685 | segs, entry); | |
686 | if (err == 0) | |
687 | queued++; | |
688 | else | |
689 | kfree_skb(segs); | |
690 | segs = nskb; | |
691 | } while (segs); | |
692 | ||
693 | if (queued) { | |
694 | if (err) /* some segments are already queued */ | |
695 | free_entry(entry); | |
696 | kfree_skb(skb); | |
697 | return 0; | |
698 | } | |
699 | out_err: | |
700 | nf_bridge_adjust_segmented_data(skb); | |
701 | return err; | |
702 | } | |
703 | ||
7af4cc3f | 704 | static int |
8c88f87c | 705 | nfqnl_mangle(void *data, int data_len, struct nf_queue_entry *e, int diff) |
7af4cc3f | 706 | { |
e2b58a67 | 707 | struct sk_buff *nskb; |
7af4cc3f | 708 | |
d8a585d7 PM |
709 | if (diff < 0) { |
710 | if (pskb_trim(e->skb, data_len)) | |
711 | return -ENOMEM; | |
712 | } else if (diff > 0) { | |
7af4cc3f HW |
713 | if (data_len > 0xFFFF) |
714 | return -EINVAL; | |
715 | if (diff > skb_tailroom(e->skb)) { | |
9a732ed6 AE |
716 | nskb = skb_copy_expand(e->skb, skb_headroom(e->skb), |
717 | diff, GFP_ATOMIC); | |
e2b58a67 | 718 | if (!nskb) { |
1158ba27 | 719 | printk(KERN_WARNING "nf_queue: OOM " |
7af4cc3f | 720 | "in mangle, dropping packet\n"); |
e2b58a67 | 721 | return -ENOMEM; |
7af4cc3f | 722 | } |
e2b58a67 PM |
723 | kfree_skb(e->skb); |
724 | e->skb = nskb; | |
7af4cc3f HW |
725 | } |
726 | skb_put(e->skb, diff); | |
727 | } | |
37d41879 | 728 | if (!skb_make_writable(e->skb, data_len)) |
7af4cc3f | 729 | return -ENOMEM; |
27d7ff46 | 730 | skb_copy_to_linear_data(e->skb, data, data_len); |
e7dfb09a | 731 | e->skb->ip_summed = CHECKSUM_NONE; |
7af4cc3f HW |
732 | return 0; |
733 | } | |
734 | ||
7af4cc3f HW |
735 | static int |
736 | nfqnl_set_mode(struct nfqnl_instance *queue, | |
737 | unsigned char mode, unsigned int range) | |
738 | { | |
c5de0dfd | 739 | int status = 0; |
7af4cc3f HW |
740 | |
741 | spin_lock_bh(&queue->lock); | |
c5de0dfd PM |
742 | switch (mode) { |
743 | case NFQNL_COPY_NONE: | |
744 | case NFQNL_COPY_META: | |
745 | queue->copy_mode = mode; | |
746 | queue->copy_range = 0; | |
747 | break; | |
748 | ||
749 | case NFQNL_COPY_PACKET: | |
750 | queue->copy_mode = mode; | |
9cefbbc9 FW |
751 | if (range == 0 || range > NFQNL_MAX_COPY_RANGE) |
752 | queue->copy_range = NFQNL_MAX_COPY_RANGE; | |
c5de0dfd PM |
753 | else |
754 | queue->copy_range = range; | |
755 | break; | |
756 | ||
757 | default: | |
758 | status = -EINVAL; | |
759 | ||
760 | } | |
7af4cc3f HW |
761 | spin_unlock_bh(&queue->lock); |
762 | ||
763 | return status; | |
764 | } | |
765 | ||
766 | static int | |
02f014d8 | 767 | dev_cmp(struct nf_queue_entry *entry, unsigned long ifindex) |
7af4cc3f | 768 | { |
1d1de89b DM |
769 | if (entry->state.in) |
770 | if (entry->state.in->ifindex == ifindex) | |
7af4cc3f | 771 | return 1; |
1d1de89b DM |
772 | if (entry->state.out) |
773 | if (entry->state.out->ifindex == ifindex) | |
7af4cc3f | 774 | return 1; |
1109a90c | 775 | #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER) |
ef47c6a7 | 776 | if (entry->skb->nf_bridge) { |
c737b7c4 FW |
777 | int physinif, physoutif; |
778 | ||
779 | physinif = nf_bridge_get_physinif(entry->skb); | |
780 | physoutif = nf_bridge_get_physoutif(entry->skb); | |
781 | ||
782 | if (physinif == ifindex || physoutif == ifindex) | |
ef47c6a7 PM |
783 | return 1; |
784 | } | |
785 | #endif | |
7af4cc3f HW |
786 | return 0; |
787 | } | |
788 | ||
789 | /* drop all packets with either indev or outdev == ifindex from all queue | |
790 | * instances */ | |
791 | static void | |
e8179610 | 792 | nfqnl_dev_drop(struct net *net, int ifindex) |
7af4cc3f HW |
793 | { |
794 | int i; | |
e8179610 | 795 | struct nfnl_queue_net *q = nfnl_queue_pernet(net); |
601e68e1 | 796 | |
9872bec7 | 797 | rcu_read_lock(); |
7af4cc3f | 798 | |
9872bec7 | 799 | for (i = 0; i < INSTANCE_BUCKETS; i++) { |
7af4cc3f | 800 | struct nfqnl_instance *inst; |
e8179610 | 801 | struct hlist_head *head = &q->instance_table[i]; |
7af4cc3f | 802 | |
b67bfe0d | 803 | hlist_for_each_entry_rcu(inst, head, hlist) |
b43d8d85 | 804 | nfqnl_flush(inst, dev_cmp, ifindex); |
7af4cc3f HW |
805 | } |
806 | ||
9872bec7 | 807 | rcu_read_unlock(); |
7af4cc3f HW |
808 | } |
809 | ||
810 | #define RCV_SKB_FAIL(err) do { netlink_ack(skb, nlh, (err)); return; } while (0) | |
811 | ||
812 | static int | |
813 | nfqnl_rcv_dev_event(struct notifier_block *this, | |
814 | unsigned long event, void *ptr) | |
815 | { | |
351638e7 | 816 | struct net_device *dev = netdev_notifier_info_to_dev(ptr); |
7af4cc3f HW |
817 | |
818 | /* Drop any packets associated with the downed device */ | |
819 | if (event == NETDEV_DOWN) | |
e8179610 | 820 | nfqnl_dev_drop(dev_net(dev), dev->ifindex); |
7af4cc3f HW |
821 | return NOTIFY_DONE; |
822 | } | |
823 | ||
824 | static struct notifier_block nfqnl_dev_notifier = { | |
825 | .notifier_call = nfqnl_rcv_dev_event, | |
826 | }; | |
827 | ||
828 | static int | |
829 | nfqnl_rcv_nl_event(struct notifier_block *this, | |
830 | unsigned long event, void *ptr) | |
831 | { | |
832 | struct netlink_notify *n = ptr; | |
e8179610 | 833 | struct nfnl_queue_net *q = nfnl_queue_pernet(n->net); |
7af4cc3f | 834 | |
dee5817e | 835 | if (event == NETLINK_URELEASE && n->protocol == NETLINK_NETFILTER) { |
7af4cc3f HW |
836 | int i; |
837 | ||
15e47304 | 838 | /* destroy all instances for this portid */ |
e8179610 | 839 | spin_lock(&q->instances_lock); |
9872bec7 | 840 | for (i = 0; i < INSTANCE_BUCKETS; i++) { |
b67bfe0d | 841 | struct hlist_node *t2; |
7af4cc3f | 842 | struct nfqnl_instance *inst; |
e8179610 | 843 | struct hlist_head *head = &q->instance_table[i]; |
7af4cc3f | 844 | |
b67bfe0d | 845 | hlist_for_each_entry_safe(inst, t2, head, hlist) { |
e8179610 | 846 | if (n->portid == inst->peer_portid) |
7af4cc3f HW |
847 | __instance_destroy(inst); |
848 | } | |
849 | } | |
e8179610 | 850 | spin_unlock(&q->instances_lock); |
7af4cc3f HW |
851 | } |
852 | return NOTIFY_DONE; | |
853 | } | |
854 | ||
855 | static struct notifier_block nfqnl_rtnl_notifier = { | |
856 | .notifier_call = nfqnl_rcv_nl_event, | |
857 | }; | |
858 | ||
5bf75853 PM |
859 | static const struct nla_policy nfqa_verdict_policy[NFQA_MAX+1] = { |
860 | [NFQA_VERDICT_HDR] = { .len = sizeof(struct nfqnl_msg_verdict_hdr) }, | |
861 | [NFQA_MARK] = { .type = NLA_U32 }, | |
862 | [NFQA_PAYLOAD] = { .type = NLA_UNSPEC }, | |
9cb01766 | 863 | [NFQA_CT] = { .type = NLA_UNSPEC }, |
bd077937 | 864 | [NFQA_EXP] = { .type = NLA_UNSPEC }, |
838ab636 HW |
865 | }; |
866 | ||
97d32cf9 FW |
867 | static const struct nla_policy nfqa_verdict_batch_policy[NFQA_MAX+1] = { |
868 | [NFQA_VERDICT_HDR] = { .len = sizeof(struct nfqnl_msg_verdict_hdr) }, | |
869 | [NFQA_MARK] = { .type = NLA_U32 }, | |
870 | }; | |
871 | ||
e8179610 G |
872 | static struct nfqnl_instance * |
873 | verdict_instance_lookup(struct nfnl_queue_net *q, u16 queue_num, int nlportid) | |
97d32cf9 FW |
874 | { |
875 | struct nfqnl_instance *queue; | |
876 | ||
e8179610 | 877 | queue = instance_lookup(q, queue_num); |
97d32cf9 FW |
878 | if (!queue) |
879 | return ERR_PTR(-ENODEV); | |
880 | ||
15e47304 | 881 | if (queue->peer_portid != nlportid) |
97d32cf9 FW |
882 | return ERR_PTR(-EPERM); |
883 | ||
884 | return queue; | |
885 | } | |
886 | ||
887 | static struct nfqnl_msg_verdict_hdr* | |
888 | verdicthdr_get(const struct nlattr * const nfqa[]) | |
889 | { | |
890 | struct nfqnl_msg_verdict_hdr *vhdr; | |
891 | unsigned int verdict; | |
892 | ||
893 | if (!nfqa[NFQA_VERDICT_HDR]) | |
894 | return NULL; | |
895 | ||
896 | vhdr = nla_data(nfqa[NFQA_VERDICT_HDR]); | |
c6675233 FW |
897 | verdict = ntohl(vhdr->verdict) & NF_VERDICT_MASK; |
898 | if (verdict > NF_MAX_VERDICT || verdict == NF_STOLEN) | |
97d32cf9 FW |
899 | return NULL; |
900 | return vhdr; | |
901 | } | |
902 | ||
903 | static int nfq_id_after(unsigned int id, unsigned int max) | |
904 | { | |
905 | return (int)(id - max) > 0; | |
906 | } | |
907 | ||
908 | static int | |
909 | nfqnl_recv_verdict_batch(struct sock *ctnl, struct sk_buff *skb, | |
910 | const struct nlmsghdr *nlh, | |
911 | const struct nlattr * const nfqa[]) | |
912 | { | |
3da07c0c | 913 | struct nfgenmsg *nfmsg = nlmsg_data(nlh); |
97d32cf9 FW |
914 | struct nf_queue_entry *entry, *tmp; |
915 | unsigned int verdict, maxid; | |
916 | struct nfqnl_msg_verdict_hdr *vhdr; | |
917 | struct nfqnl_instance *queue; | |
918 | LIST_HEAD(batch_list); | |
919 | u16 queue_num = ntohs(nfmsg->res_id); | |
920 | ||
e8179610 G |
921 | struct net *net = sock_net(ctnl); |
922 | struct nfnl_queue_net *q = nfnl_queue_pernet(net); | |
923 | ||
924 | queue = verdict_instance_lookup(q, queue_num, | |
925 | NETLINK_CB(skb).portid); | |
97d32cf9 FW |
926 | if (IS_ERR(queue)) |
927 | return PTR_ERR(queue); | |
928 | ||
929 | vhdr = verdicthdr_get(nfqa); | |
930 | if (!vhdr) | |
931 | return -EINVAL; | |
932 | ||
933 | verdict = ntohl(vhdr->verdict); | |
934 | maxid = ntohl(vhdr->id); | |
935 | ||
936 | spin_lock_bh(&queue->lock); | |
937 | ||
938 | list_for_each_entry_safe(entry, tmp, &queue->queue_list, list) { | |
939 | if (nfq_id_after(entry->id, maxid)) | |
940 | break; | |
941 | __dequeue_entry(queue, entry); | |
942 | list_add_tail(&entry->list, &batch_list); | |
943 | } | |
944 | ||
945 | spin_unlock_bh(&queue->lock); | |
946 | ||
947 | if (list_empty(&batch_list)) | |
948 | return -ENOENT; | |
949 | ||
950 | list_for_each_entry_safe(entry, tmp, &batch_list, list) { | |
951 | if (nfqa[NFQA_MARK]) | |
952 | entry->skb->mark = ntohl(nla_get_be32(nfqa[NFQA_MARK])); | |
953 | nf_reinject(entry, verdict); | |
954 | } | |
955 | return 0; | |
956 | } | |
957 | ||
7af4cc3f HW |
958 | static int |
959 | nfqnl_recv_verdict(struct sock *ctnl, struct sk_buff *skb, | |
39938324 PM |
960 | const struct nlmsghdr *nlh, |
961 | const struct nlattr * const nfqa[]) | |
7af4cc3f | 962 | { |
3da07c0c | 963 | struct nfgenmsg *nfmsg = nlmsg_data(nlh); |
7af4cc3f HW |
964 | u_int16_t queue_num = ntohs(nfmsg->res_id); |
965 | ||
966 | struct nfqnl_msg_verdict_hdr *vhdr; | |
967 | struct nfqnl_instance *queue; | |
968 | unsigned int verdict; | |
02f014d8 | 969 | struct nf_queue_entry *entry; |
8c88f87c PNA |
970 | enum ip_conntrack_info uninitialized_var(ctinfo); |
971 | struct nf_conn *ct = NULL; | |
7af4cc3f | 972 | |
e8179610 G |
973 | struct net *net = sock_net(ctnl); |
974 | struct nfnl_queue_net *q = nfnl_queue_pernet(net); | |
7af4cc3f | 975 | |
e8179610 G |
976 | queue = instance_lookup(q, queue_num); |
977 | if (!queue) | |
978 | queue = verdict_instance_lookup(q, queue_num, | |
979 | NETLINK_CB(skb).portid); | |
97d32cf9 FW |
980 | if (IS_ERR(queue)) |
981 | return PTR_ERR(queue); | |
7af4cc3f | 982 | |
97d32cf9 FW |
983 | vhdr = verdicthdr_get(nfqa); |
984 | if (!vhdr) | |
84a797dd | 985 | return -EINVAL; |
7af4cc3f | 986 | |
7af4cc3f HW |
987 | verdict = ntohl(vhdr->verdict); |
988 | ||
b43d8d85 | 989 | entry = find_dequeue_entry(queue, ntohl(vhdr->id)); |
84a797dd ED |
990 | if (entry == NULL) |
991 | return -ENOENT; | |
7af4cc3f | 992 | |
bd077937 | 993 | if (nfqa[NFQA_CT]) { |
7c622345 | 994 | ct = nfqnl_ct_parse(entry->skb, nfqa[NFQA_CT], &ctinfo); |
bd077937 PNA |
995 | if (ct && nfqa[NFQA_EXP]) { |
996 | nfqnl_attach_expect(ct, nfqa[NFQA_EXP], | |
997 | NETLINK_CB(skb).portid, | |
998 | nlmsg_report(nlh)); | |
999 | } | |
1000 | } | |
9cb01766 | 1001 | |
df6fb868 | 1002 | if (nfqa[NFQA_PAYLOAD]) { |
8c88f87c PNA |
1003 | u16 payload_len = nla_len(nfqa[NFQA_PAYLOAD]); |
1004 | int diff = payload_len - entry->skb->len; | |
1005 | ||
df6fb868 | 1006 | if (nfqnl_mangle(nla_data(nfqa[NFQA_PAYLOAD]), |
8c88f87c | 1007 | payload_len, entry, diff) < 0) |
7af4cc3f | 1008 | verdict = NF_DROP; |
8c88f87c | 1009 | |
7c622345 | 1010 | if (ct) |
0a0d80eb | 1011 | nfqnl_ct_seq_adjust(entry->skb, ct, ctinfo, diff); |
7af4cc3f HW |
1012 | } |
1013 | ||
df6fb868 | 1014 | if (nfqa[NFQA_MARK]) |
ea3a66ff | 1015 | entry->skb->mark = ntohl(nla_get_be32(nfqa[NFQA_MARK])); |
601e68e1 | 1016 | |
4b3d15ef | 1017 | nf_reinject(entry, verdict); |
7af4cc3f HW |
1018 | return 0; |
1019 | } | |
1020 | ||
1021 | static int | |
1022 | nfqnl_recv_unsupp(struct sock *ctnl, struct sk_buff *skb, | |
39938324 PM |
1023 | const struct nlmsghdr *nlh, |
1024 | const struct nlattr * const nfqa[]) | |
7af4cc3f HW |
1025 | { |
1026 | return -ENOTSUPP; | |
1027 | } | |
1028 | ||
5bf75853 PM |
1029 | static const struct nla_policy nfqa_cfg_policy[NFQA_CFG_MAX+1] = { |
1030 | [NFQA_CFG_CMD] = { .len = sizeof(struct nfqnl_msg_config_cmd) }, | |
1031 | [NFQA_CFG_PARAMS] = { .len = sizeof(struct nfqnl_msg_config_params) }, | |
838ab636 HW |
1032 | }; |
1033 | ||
e3ac5298 | 1034 | static const struct nf_queue_handler nfqh = { |
bbd86b9f HW |
1035 | .outfn = &nfqnl_enqueue_packet, |
1036 | }; | |
1037 | ||
7af4cc3f HW |
1038 | static int |
1039 | nfqnl_recv_config(struct sock *ctnl, struct sk_buff *skb, | |
39938324 PM |
1040 | const struct nlmsghdr *nlh, |
1041 | const struct nlattr * const nfqa[]) | |
7af4cc3f | 1042 | { |
3da07c0c | 1043 | struct nfgenmsg *nfmsg = nlmsg_data(nlh); |
7af4cc3f HW |
1044 | u_int16_t queue_num = ntohs(nfmsg->res_id); |
1045 | struct nfqnl_instance *queue; | |
9872bec7 | 1046 | struct nfqnl_msg_config_cmd *cmd = NULL; |
e8179610 G |
1047 | struct net *net = sock_net(ctnl); |
1048 | struct nfnl_queue_net *q = nfnl_queue_pernet(net); | |
838ab636 | 1049 | int ret = 0; |
7af4cc3f | 1050 | |
9872bec7 PM |
1051 | if (nfqa[NFQA_CFG_CMD]) { |
1052 | cmd = nla_data(nfqa[NFQA_CFG_CMD]); | |
1053 | ||
0360ae41 | 1054 | /* Obsolete commands without queue context */ |
9872bec7 | 1055 | switch (cmd->command) { |
0360ae41 FW |
1056 | case NFQNL_CFG_CMD_PF_BIND: return 0; |
1057 | case NFQNL_CFG_CMD_PF_UNBIND: return 0; | |
9872bec7 | 1058 | } |
9872bec7 PM |
1059 | } |
1060 | ||
1061 | rcu_read_lock(); | |
e8179610 | 1062 | queue = instance_lookup(q, queue_num); |
15e47304 | 1063 | if (queue && queue->peer_portid != NETLINK_CB(skb).portid) { |
a3c8e7fd | 1064 | ret = -EPERM; |
9872bec7 | 1065 | goto err_out_unlock; |
a3c8e7fd PM |
1066 | } |
1067 | ||
9872bec7 | 1068 | if (cmd != NULL) { |
7af4cc3f HW |
1069 | switch (cmd->command) { |
1070 | case NFQNL_CFG_CMD_BIND: | |
9872bec7 PM |
1071 | if (queue) { |
1072 | ret = -EBUSY; | |
1073 | goto err_out_unlock; | |
1074 | } | |
e8179610 G |
1075 | queue = instance_create(q, queue_num, |
1076 | NETLINK_CB(skb).portid); | |
baab2ce7 PM |
1077 | if (IS_ERR(queue)) { |
1078 | ret = PTR_ERR(queue); | |
9872bec7 PM |
1079 | goto err_out_unlock; |
1080 | } | |
7af4cc3f HW |
1081 | break; |
1082 | case NFQNL_CFG_CMD_UNBIND: | |
9872bec7 PM |
1083 | if (!queue) { |
1084 | ret = -ENODEV; | |
1085 | goto err_out_unlock; | |
1086 | } | |
e8179610 | 1087 | instance_destroy(q, queue); |
7af4cc3f HW |
1088 | break; |
1089 | case NFQNL_CFG_CMD_PF_BIND: | |
7af4cc3f | 1090 | case NFQNL_CFG_CMD_PF_UNBIND: |
7af4cc3f HW |
1091 | break; |
1092 | default: | |
cd21f0ac | 1093 | ret = -ENOTSUPP; |
838ab636 | 1094 | break; |
7af4cc3f | 1095 | } |
7af4cc3f HW |
1096 | } |
1097 | ||
df6fb868 | 1098 | if (nfqa[NFQA_CFG_PARAMS]) { |
7af4cc3f | 1099 | struct nfqnl_msg_config_params *params; |
7af4cc3f | 1100 | |
406dbfc9 | 1101 | if (!queue) { |
a3c8e7fd | 1102 | ret = -ENODEV; |
9872bec7 | 1103 | goto err_out_unlock; |
406dbfc9 | 1104 | } |
df6fb868 | 1105 | params = nla_data(nfqa[NFQA_CFG_PARAMS]); |
7af4cc3f HW |
1106 | nfqnl_set_mode(queue, params->copy_mode, |
1107 | ntohl(params->copy_range)); | |
1108 | } | |
1109 | ||
df6fb868 | 1110 | if (nfqa[NFQA_CFG_QUEUE_MAXLEN]) { |
829e17a1 | 1111 | __be32 *queue_maxlen; |
a3c8e7fd PM |
1112 | |
1113 | if (!queue) { | |
1114 | ret = -ENODEV; | |
9872bec7 | 1115 | goto err_out_unlock; |
a3c8e7fd | 1116 | } |
df6fb868 | 1117 | queue_maxlen = nla_data(nfqa[NFQA_CFG_QUEUE_MAXLEN]); |
829e17a1 EL |
1118 | spin_lock_bh(&queue->lock); |
1119 | queue->queue_maxlen = ntohl(*queue_maxlen); | |
1120 | spin_unlock_bh(&queue->lock); | |
1121 | } | |
1122 | ||
fdb694a0 KK |
1123 | if (nfqa[NFQA_CFG_FLAGS]) { |
1124 | __u32 flags, mask; | |
1125 | ||
1126 | if (!queue) { | |
1127 | ret = -ENODEV; | |
1128 | goto err_out_unlock; | |
1129 | } | |
1130 | ||
1131 | if (!nfqa[NFQA_CFG_MASK]) { | |
1132 | /* A mask is needed to specify which flags are being | |
1133 | * changed. | |
1134 | */ | |
1135 | ret = -EINVAL; | |
1136 | goto err_out_unlock; | |
1137 | } | |
1138 | ||
1139 | flags = ntohl(nla_get_be32(nfqa[NFQA_CFG_FLAGS])); | |
1140 | mask = ntohl(nla_get_be32(nfqa[NFQA_CFG_MASK])); | |
1141 | ||
46ba5a25 KK |
1142 | if (flags >= NFQA_CFG_F_MAX) { |
1143 | ret = -EOPNOTSUPP; | |
1144 | goto err_out_unlock; | |
1145 | } | |
1146 | ||
fdb694a0 KK |
1147 | spin_lock_bh(&queue->lock); |
1148 | queue->flags &= ~mask; | |
1149 | queue->flags |= flags & mask; | |
1150 | spin_unlock_bh(&queue->lock); | |
1151 | } | |
1152 | ||
9872bec7 PM |
1153 | err_out_unlock: |
1154 | rcu_read_unlock(); | |
838ab636 | 1155 | return ret; |
7af4cc3f HW |
1156 | } |
1157 | ||
7c8d4cb4 | 1158 | static const struct nfnl_callback nfqnl_cb[NFQNL_MSG_MAX] = { |
84a797dd | 1159 | [NFQNL_MSG_PACKET] = { .call_rcu = nfqnl_recv_unsupp, |
37d2e7a2 | 1160 | .attr_count = NFQA_MAX, }, |
84a797dd | 1161 | [NFQNL_MSG_VERDICT] = { .call_rcu = nfqnl_recv_verdict, |
5bf75853 PM |
1162 | .attr_count = NFQA_MAX, |
1163 | .policy = nfqa_verdict_policy }, | |
7af4cc3f | 1164 | [NFQNL_MSG_CONFIG] = { .call = nfqnl_recv_config, |
5bf75853 PM |
1165 | .attr_count = NFQA_CFG_MAX, |
1166 | .policy = nfqa_cfg_policy }, | |
97d32cf9 FW |
1167 | [NFQNL_MSG_VERDICT_BATCH]={ .call_rcu = nfqnl_recv_verdict_batch, |
1168 | .attr_count = NFQA_MAX, | |
1169 | .policy = nfqa_verdict_batch_policy }, | |
7af4cc3f HW |
1170 | }; |
1171 | ||
7c8d4cb4 | 1172 | static const struct nfnetlink_subsystem nfqnl_subsys = { |
7af4cc3f HW |
1173 | .name = "nf_queue", |
1174 | .subsys_id = NFNL_SUBSYS_QUEUE, | |
1175 | .cb_count = NFQNL_MSG_MAX, | |
7af4cc3f HW |
1176 | .cb = nfqnl_cb, |
1177 | }; | |
1178 | ||
838ab636 HW |
1179 | #ifdef CONFIG_PROC_FS |
1180 | struct iter_state { | |
e8179610 | 1181 | struct seq_net_private p; |
838ab636 HW |
1182 | unsigned int bucket; |
1183 | }; | |
1184 | ||
1185 | static struct hlist_node *get_first(struct seq_file *seq) | |
1186 | { | |
1187 | struct iter_state *st = seq->private; | |
e8179610 G |
1188 | struct net *net; |
1189 | struct nfnl_queue_net *q; | |
838ab636 HW |
1190 | |
1191 | if (!st) | |
1192 | return NULL; | |
1193 | ||
e8179610 G |
1194 | net = seq_file_net(seq); |
1195 | q = nfnl_queue_pernet(net); | |
838ab636 | 1196 | for (st->bucket = 0; st->bucket < INSTANCE_BUCKETS; st->bucket++) { |
e8179610 G |
1197 | if (!hlist_empty(&q->instance_table[st->bucket])) |
1198 | return q->instance_table[st->bucket].first; | |
838ab636 HW |
1199 | } |
1200 | return NULL; | |
1201 | } | |
1202 | ||
1203 | static struct hlist_node *get_next(struct seq_file *seq, struct hlist_node *h) | |
1204 | { | |
1205 | struct iter_state *st = seq->private; | |
e8179610 | 1206 | struct net *net = seq_file_net(seq); |
838ab636 HW |
1207 | |
1208 | h = h->next; | |
1209 | while (!h) { | |
e8179610 G |
1210 | struct nfnl_queue_net *q; |
1211 | ||
838ab636 HW |
1212 | if (++st->bucket >= INSTANCE_BUCKETS) |
1213 | return NULL; | |
1214 | ||
e8179610 G |
1215 | q = nfnl_queue_pernet(net); |
1216 | h = q->instance_table[st->bucket].first; | |
838ab636 HW |
1217 | } |
1218 | return h; | |
1219 | } | |
1220 | ||
1221 | static struct hlist_node *get_idx(struct seq_file *seq, loff_t pos) | |
1222 | { | |
1223 | struct hlist_node *head; | |
1224 | head = get_first(seq); | |
1225 | ||
1226 | if (head) | |
1227 | while (pos && (head = get_next(seq, head))) | |
1228 | pos--; | |
1229 | return pos ? NULL : head; | |
1230 | } | |
1231 | ||
e8179610 G |
1232 | static void *seq_start(struct seq_file *s, loff_t *pos) |
1233 | __acquires(nfnl_queue_pernet(seq_file_net(s))->instances_lock) | |
838ab636 | 1234 | { |
e8179610 G |
1235 | spin_lock(&nfnl_queue_pernet(seq_file_net(s))->instances_lock); |
1236 | return get_idx(s, *pos); | |
838ab636 HW |
1237 | } |
1238 | ||
1239 | static void *seq_next(struct seq_file *s, void *v, loff_t *pos) | |
1240 | { | |
1241 | (*pos)++; | |
1242 | return get_next(s, v); | |
1243 | } | |
1244 | ||
1245 | static void seq_stop(struct seq_file *s, void *v) | |
e8179610 | 1246 | __releases(nfnl_queue_pernet(seq_file_net(s))->instances_lock) |
838ab636 | 1247 | { |
e8179610 | 1248 | spin_unlock(&nfnl_queue_pernet(seq_file_net(s))->instances_lock); |
838ab636 HW |
1249 | } |
1250 | ||
1251 | static int seq_show(struct seq_file *s, void *v) | |
1252 | { | |
1253 | const struct nfqnl_instance *inst = v; | |
1254 | ||
e71456ae SRRH |
1255 | seq_printf(s, "%5d %6d %5d %1d %5d %5d %5d %8d %2d\n", |
1256 | inst->queue_num, | |
1257 | inst->peer_portid, inst->queue_total, | |
1258 | inst->copy_mode, inst->copy_range, | |
1259 | inst->queue_dropped, inst->queue_user_dropped, | |
1260 | inst->id_sequence, 1); | |
1261 | return seq_has_overflowed(s); | |
838ab636 HW |
1262 | } |
1263 | ||
56b3d975 | 1264 | static const struct seq_operations nfqnl_seq_ops = { |
838ab636 HW |
1265 | .start = seq_start, |
1266 | .next = seq_next, | |
1267 | .stop = seq_stop, | |
1268 | .show = seq_show, | |
1269 | }; | |
1270 | ||
1271 | static int nfqnl_open(struct inode *inode, struct file *file) | |
1272 | { | |
e8179610 | 1273 | return seq_open_net(inode, file, &nfqnl_seq_ops, |
e2da5913 | 1274 | sizeof(struct iter_state)); |
838ab636 HW |
1275 | } |
1276 | ||
da7071d7 | 1277 | static const struct file_operations nfqnl_file_ops = { |
838ab636 HW |
1278 | .owner = THIS_MODULE, |
1279 | .open = nfqnl_open, | |
1280 | .read = seq_read, | |
1281 | .llseek = seq_lseek, | |
e8179610 | 1282 | .release = seq_release_net, |
838ab636 HW |
1283 | }; |
1284 | ||
1285 | #endif /* PROC_FS */ | |
1286 | ||
e8179610 | 1287 | static int __net_init nfnl_queue_net_init(struct net *net) |
7af4cc3f | 1288 | { |
e8179610 G |
1289 | unsigned int i; |
1290 | struct nfnl_queue_net *q = nfnl_queue_pernet(net); | |
601e68e1 | 1291 | |
838ab636 | 1292 | for (i = 0; i < INSTANCE_BUCKETS; i++) |
e8179610 G |
1293 | INIT_HLIST_HEAD(&q->instance_table[i]); |
1294 | ||
1295 | spin_lock_init(&q->instances_lock); | |
1296 | ||
1297 | #ifdef CONFIG_PROC_FS | |
1298 | if (!proc_create("nfnetlink_queue", 0440, | |
1299 | net->nf.proc_netfilter, &nfqnl_file_ops)) | |
1300 | return -ENOMEM; | |
1301 | #endif | |
1302 | return 0; | |
1303 | } | |
1304 | ||
1305 | static void __net_exit nfnl_queue_net_exit(struct net *net) | |
1306 | { | |
e778f56e | 1307 | #ifdef CONFIG_PROC_FS |
e8179610 | 1308 | remove_proc_entry("nfnetlink_queue", net->nf.proc_netfilter); |
e778f56e | 1309 | #endif |
e8179610 G |
1310 | } |
1311 | ||
1312 | static struct pernet_operations nfnl_queue_net_ops = { | |
1313 | .init = nfnl_queue_net_init, | |
1314 | .exit = nfnl_queue_net_exit, | |
1315 | .id = &nfnl_queue_net_id, | |
1316 | .size = sizeof(struct nfnl_queue_net), | |
1317 | }; | |
1318 | ||
1319 | static int __init nfnetlink_queue_init(void) | |
1320 | { | |
1321 | int status = -ENOMEM; | |
838ab636 | 1322 | |
7af4cc3f HW |
1323 | netlink_register_notifier(&nfqnl_rtnl_notifier); |
1324 | status = nfnetlink_subsys_register(&nfqnl_subsys); | |
1325 | if (status < 0) { | |
e8179610 | 1326 | pr_err("nf_queue: failed to create netlink socket\n"); |
7af4cc3f HW |
1327 | goto cleanup_netlink_notifier; |
1328 | } | |
1329 | ||
e8179610 G |
1330 | status = register_pernet_subsys(&nfnl_queue_net_ops); |
1331 | if (status < 0) { | |
1332 | pr_err("nf_queue: failed to register pernet ops\n"); | |
838ab636 | 1333 | goto cleanup_subsys; |
e8179610 | 1334 | } |
7af4cc3f | 1335 | register_netdevice_notifier(&nfqnl_dev_notifier); |
0360ae41 | 1336 | nf_register_queue_handler(&nfqh); |
7af4cc3f HW |
1337 | return status; |
1338 | ||
838ab636 | 1339 | cleanup_subsys: |
7af4cc3f | 1340 | nfnetlink_subsys_unregister(&nfqnl_subsys); |
7af4cc3f HW |
1341 | cleanup_netlink_notifier: |
1342 | netlink_unregister_notifier(&nfqnl_rtnl_notifier); | |
1343 | return status; | |
1344 | } | |
1345 | ||
65b4b4e8 | 1346 | static void __exit nfnetlink_queue_fini(void) |
7af4cc3f | 1347 | { |
0360ae41 | 1348 | nf_unregister_queue_handler(); |
32292a7f | 1349 | unregister_netdevice_notifier(&nfqnl_dev_notifier); |
e8179610 | 1350 | unregister_pernet_subsys(&nfnl_queue_net_ops); |
32292a7f PM |
1351 | nfnetlink_subsys_unregister(&nfqnl_subsys); |
1352 | netlink_unregister_notifier(&nfqnl_rtnl_notifier); | |
67137f3c JDB |
1353 | |
1354 | rcu_barrier(); /* Wait for completion of call_rcu()'s */ | |
7af4cc3f HW |
1355 | } |
1356 | ||
1357 | MODULE_DESCRIPTION("netfilter packet queue handler"); | |
1358 | MODULE_AUTHOR("Harald Welte <laforge@netfilter.org>"); | |
1359 | MODULE_LICENSE("GPL"); | |
1360 | MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_QUEUE); | |
1361 | ||
65b4b4e8 AM |
1362 | module_init(nfnetlink_queue_init); |
1363 | module_exit(nfnetlink_queue_fini); |