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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> | |
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 | |
cc6bc448 | 58 | u32 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 * |
cc6bc448 | 113 | instance_create(struct nfnl_queue_net *q, u_int16_t queue_num, u32 portid) |
7af4cc3f | 114 | { |
baab2ce7 | 115 | struct nfqnl_instance *inst; |
9872bec7 | 116 | unsigned int h; |
baab2ce7 | 117 | int err; |
7af4cc3f | 118 | |
e8179610 G |
119 | spin_lock(&q->instances_lock); |
120 | if (instance_lookup(q, queue_num)) { | |
baab2ce7 | 121 | err = -EEXIST; |
7af4cc3f | 122 | goto out_unlock; |
baab2ce7 | 123 | } |
7af4cc3f | 124 | |
10dfdc69 | 125 | inst = kzalloc(sizeof(*inst), GFP_ATOMIC); |
baab2ce7 PM |
126 | if (!inst) { |
127 | err = -ENOMEM; | |
7af4cc3f | 128 | goto out_unlock; |
baab2ce7 | 129 | } |
7af4cc3f | 130 | |
7af4cc3f | 131 | inst->queue_num = queue_num; |
15e47304 | 132 | inst->peer_portid = portid; |
7af4cc3f | 133 | inst->queue_maxlen = NFQNL_QMAX_DEFAULT; |
9cefbbc9 | 134 | inst->copy_range = NFQNL_MAX_COPY_RANGE; |
7af4cc3f | 135 | inst->copy_mode = NFQNL_COPY_NONE; |
181a46a5 | 136 | spin_lock_init(&inst->lock); |
7af4cc3f HW |
137 | INIT_LIST_HEAD(&inst->queue_list); |
138 | ||
baab2ce7 PM |
139 | if (!try_module_get(THIS_MODULE)) { |
140 | err = -EAGAIN; | |
7af4cc3f | 141 | goto out_free; |
baab2ce7 | 142 | } |
7af4cc3f | 143 | |
9872bec7 | 144 | h = instance_hashfn(queue_num); |
e8179610 | 145 | hlist_add_head_rcu(&inst->hlist, &q->instance_table[h]); |
7af4cc3f | 146 | |
e8179610 | 147 | spin_unlock(&q->instances_lock); |
7af4cc3f | 148 | |
7af4cc3f HW |
149 | return inst; |
150 | ||
151 | out_free: | |
152 | kfree(inst); | |
153 | out_unlock: | |
e8179610 | 154 | spin_unlock(&q->instances_lock); |
baab2ce7 | 155 | return ERR_PTR(err); |
7af4cc3f HW |
156 | } |
157 | ||
b43d8d85 PM |
158 | static void nfqnl_flush(struct nfqnl_instance *queue, nfqnl_cmpfn cmpfn, |
159 | unsigned long data); | |
7af4cc3f HW |
160 | |
161 | static void | |
9872bec7 | 162 | instance_destroy_rcu(struct rcu_head *head) |
7af4cc3f | 163 | { |
9872bec7 PM |
164 | struct nfqnl_instance *inst = container_of(head, struct nfqnl_instance, |
165 | rcu); | |
7af4cc3f | 166 | |
b43d8d85 | 167 | nfqnl_flush(inst, NULL, 0); |
9872bec7 | 168 | kfree(inst); |
7af4cc3f HW |
169 | module_put(THIS_MODULE); |
170 | } | |
171 | ||
9872bec7 | 172 | static void |
7af4cc3f HW |
173 | __instance_destroy(struct nfqnl_instance *inst) |
174 | { | |
9872bec7 PM |
175 | hlist_del_rcu(&inst->hlist); |
176 | call_rcu(&inst->rcu, instance_destroy_rcu); | |
7af4cc3f HW |
177 | } |
178 | ||
9872bec7 | 179 | static void |
e8179610 | 180 | instance_destroy(struct nfnl_queue_net *q, struct nfqnl_instance *inst) |
7af4cc3f | 181 | { |
e8179610 | 182 | spin_lock(&q->instances_lock); |
9872bec7 | 183 | __instance_destroy(inst); |
e8179610 | 184 | spin_unlock(&q->instances_lock); |
7af4cc3f HW |
185 | } |
186 | ||
7af4cc3f | 187 | static inline void |
02f014d8 | 188 | __enqueue_entry(struct nfqnl_instance *queue, struct nf_queue_entry *entry) |
7af4cc3f | 189 | { |
0ac41e81 | 190 | list_add_tail(&entry->list, &queue->queue_list); |
7af4cc3f HW |
191 | queue->queue_total++; |
192 | } | |
193 | ||
97d32cf9 FW |
194 | static void |
195 | __dequeue_entry(struct nfqnl_instance *queue, struct nf_queue_entry *entry) | |
196 | { | |
197 | list_del(&entry->list); | |
198 | queue->queue_total--; | |
199 | } | |
200 | ||
02f014d8 | 201 | static struct nf_queue_entry * |
b43d8d85 | 202 | find_dequeue_entry(struct nfqnl_instance *queue, unsigned int id) |
7af4cc3f | 203 | { |
02f014d8 | 204 | struct nf_queue_entry *entry = NULL, *i; |
601e68e1 | 205 | |
7af4cc3f | 206 | spin_lock_bh(&queue->lock); |
b43d8d85 PM |
207 | |
208 | list_for_each_entry(i, &queue->queue_list, list) { | |
209 | if (i->id == id) { | |
210 | entry = i; | |
211 | break; | |
212 | } | |
213 | } | |
214 | ||
97d32cf9 FW |
215 | if (entry) |
216 | __dequeue_entry(queue, entry); | |
b43d8d85 | 217 | |
7af4cc3f HW |
218 | spin_unlock_bh(&queue->lock); |
219 | ||
220 | return entry; | |
221 | } | |
222 | ||
223 | static void | |
b43d8d85 | 224 | nfqnl_flush(struct nfqnl_instance *queue, nfqnl_cmpfn cmpfn, unsigned long data) |
7af4cc3f | 225 | { |
02f014d8 | 226 | struct nf_queue_entry *entry, *next; |
b43d8d85 | 227 | |
7af4cc3f | 228 | spin_lock_bh(&queue->lock); |
b43d8d85 PM |
229 | list_for_each_entry_safe(entry, next, &queue->queue_list, list) { |
230 | if (!cmpfn || cmpfn(entry, data)) { | |
231 | list_del(&entry->list); | |
232 | queue->queue_total--; | |
4b3d15ef | 233 | nf_reinject(entry, NF_DROP); |
b43d8d85 PM |
234 | } |
235 | } | |
7af4cc3f HW |
236 | spin_unlock_bh(&queue->lock); |
237 | } | |
238 | ||
496e4ae7 FW |
239 | static int |
240 | nfqnl_put_packet_info(struct sk_buff *nlskb, struct sk_buff *packet, | |
241 | bool csum_verify) | |
7237190d FW |
242 | { |
243 | __u32 flags = 0; | |
244 | ||
245 | if (packet->ip_summed == CHECKSUM_PARTIAL) | |
246 | flags = NFQA_SKB_CSUMNOTREADY; | |
496e4ae7 FW |
247 | else if (csum_verify) |
248 | flags = NFQA_SKB_CSUM_NOTVERIFIED; | |
249 | ||
7237190d FW |
250 | if (skb_is_gso(packet)) |
251 | flags |= NFQA_SKB_GSO; | |
252 | ||
253 | return flags ? nla_put_be32(nlskb, NFQA_SKB_INFO, htonl(flags)) : 0; | |
254 | } | |
255 | ||
08c0cad6 VG |
256 | static int nfqnl_put_sk_uidgid(struct sk_buff *skb, struct sock *sk) |
257 | { | |
258 | const struct cred *cred; | |
259 | ||
a8399231 | 260 | if (!sk_fullsock(sk)) |
08c0cad6 VG |
261 | return 0; |
262 | ||
263 | read_lock_bh(&sk->sk_callback_lock); | |
264 | if (sk->sk_socket && sk->sk_socket->file) { | |
265 | cred = sk->sk_socket->file->f_cred; | |
266 | if (nla_put_be32(skb, NFQA_UID, | |
267 | htonl(from_kuid_munged(&init_user_ns, cred->fsuid)))) | |
268 | goto nla_put_failure; | |
269 | if (nla_put_be32(skb, NFQA_GID, | |
270 | htonl(from_kgid_munged(&init_user_ns, cred->fsgid)))) | |
271 | goto nla_put_failure; | |
272 | } | |
273 | read_unlock_bh(&sk->sk_callback_lock); | |
274 | return 0; | |
275 | ||
276 | nla_put_failure: | |
277 | read_unlock_bh(&sk->sk_callback_lock); | |
278 | return -1; | |
279 | } | |
280 | ||
7af4cc3f | 281 | static struct sk_buff * |
74332687 | 282 | nfqnl_build_packet_message(struct net *net, struct nfqnl_instance *queue, |
5863702a ED |
283 | struct nf_queue_entry *entry, |
284 | __be32 **packet_id_ptr) | |
7af4cc3f | 285 | { |
7af4cc3f | 286 | size_t size; |
6ee584be | 287 | size_t data_len = 0, cap_len = 0; |
af2806f8 | 288 | unsigned int hlen = 0; |
7af4cc3f | 289 | struct sk_buff *skb; |
5863702a ED |
290 | struct nlattr *nla; |
291 | struct nfqnl_msg_packet_hdr *pmsg; | |
7af4cc3f HW |
292 | struct nlmsghdr *nlh; |
293 | struct nfgenmsg *nfmsg; | |
3e4ead4f JJ |
294 | struct sk_buff *entskb = entry->skb; |
295 | struct net_device *indev; | |
296 | struct net_device *outdev; | |
9cb01766 PNA |
297 | struct nf_conn *ct = NULL; |
298 | enum ip_conntrack_info uninitialized_var(ctinfo); | |
496e4ae7 | 299 | bool csum_verify; |
7af4cc3f | 300 | |
573ce260 | 301 | size = nlmsg_total_size(sizeof(struct nfgenmsg)) |
df6fb868 PM |
302 | + nla_total_size(sizeof(struct nfqnl_msg_packet_hdr)) |
303 | + nla_total_size(sizeof(u_int32_t)) /* ifindex */ | |
304 | + nla_total_size(sizeof(u_int32_t)) /* ifindex */ | |
1109a90c | 305 | #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER) |
df6fb868 PM |
306 | + nla_total_size(sizeof(u_int32_t)) /* ifindex */ |
307 | + nla_total_size(sizeof(u_int32_t)) /* ifindex */ | |
fbcd923c | 308 | #endif |
df6fb868 PM |
309 | + nla_total_size(sizeof(u_int32_t)) /* mark */ |
310 | + nla_total_size(sizeof(struct nfqnl_msg_packet_hw)) | |
7237190d | 311 | + nla_total_size(sizeof(u_int32_t)) /* skbinfo */ |
ae08ce00 ED |
312 | + nla_total_size(sizeof(u_int32_t)); /* cap_len */ |
313 | ||
314 | if (entskb->tstamp.tv64) | |
315 | size += nla_total_size(sizeof(struct nfqnl_msg_packet_timestamp)); | |
7af4cc3f | 316 | |
1d1de89b DM |
317 | if (entry->state.hook <= NF_INET_FORWARD || |
318 | (entry->state.hook == NF_INET_POST_ROUTING && entskb->sk == NULL)) | |
496e4ae7 FW |
319 | csum_verify = !skb_csum_unnecessary(entskb); |
320 | else | |
321 | csum_verify = false; | |
322 | ||
1d1de89b | 323 | outdev = entry->state.out; |
3e4ead4f | 324 | |
c463ac97 | 325 | switch ((enum nfqnl_config_mode)ACCESS_ONCE(queue->copy_mode)) { |
7af4cc3f HW |
326 | case NFQNL_COPY_META: |
327 | case NFQNL_COPY_NONE: | |
7af4cc3f | 328 | break; |
601e68e1 | 329 | |
7af4cc3f | 330 | case NFQNL_COPY_PACKET: |
00bd1cc2 FW |
331 | if (!(queue->flags & NFQA_CFG_F_GSO) && |
332 | entskb->ip_summed == CHECKSUM_PARTIAL && | |
c463ac97 | 333 | skb_checksum_help(entskb)) |
e7dfb09a | 334 | return NULL; |
c463ac97 ED |
335 | |
336 | data_len = ACCESS_ONCE(queue->copy_range); | |
9cefbbc9 | 337 | if (data_len > entskb->len) |
3e4ead4f | 338 | data_len = entskb->len; |
601e68e1 | 339 | |
af2806f8 TG |
340 | hlen = skb_zerocopy_headlen(entskb); |
341 | hlen = min_t(unsigned int, hlen, data_len); | |
ae08ce00 | 342 | size += sizeof(struct nlattr) + hlen; |
6ee584be | 343 | cap_len = entskb->len; |
7af4cc3f | 344 | break; |
7af4cc3f HW |
345 | } |
346 | ||
7c622345 PNA |
347 | if (queue->flags & NFQA_CFG_F_CONNTRACK) |
348 | ct = nfqnl_ct_get(entskb, &size, &ctinfo); | |
7af4cc3f | 349 | |
08c0cad6 VG |
350 | if (queue->flags & NFQA_CFG_F_UID_GID) { |
351 | size += (nla_total_size(sizeof(u_int32_t)) /* uid */ | |
352 | + nla_total_size(sizeof(u_int32_t))); /* gid */ | |
353 | } | |
354 | ||
74332687 | 355 | skb = nfnetlink_alloc_skb(net, size, queue->peer_portid, |
3ab1f683 | 356 | GFP_ATOMIC); |
36d5fe6a ZK |
357 | if (!skb) { |
358 | skb_tx_error(entskb); | |
3da07c0c | 359 | return NULL; |
36d5fe6a | 360 | } |
601e68e1 | 361 | |
3da07c0c | 362 | nlh = nlmsg_put(skb, 0, 0, |
7af4cc3f | 363 | NFNL_SUBSYS_QUEUE << 8 | NFQNL_MSG_PACKET, |
3da07c0c DM |
364 | sizeof(struct nfgenmsg), 0); |
365 | if (!nlh) { | |
36d5fe6a | 366 | skb_tx_error(entskb); |
3da07c0c DM |
367 | kfree_skb(skb); |
368 | return NULL; | |
369 | } | |
370 | nfmsg = nlmsg_data(nlh); | |
1d1de89b | 371 | nfmsg->nfgen_family = entry->state.pf; |
7af4cc3f HW |
372 | nfmsg->version = NFNETLINK_V0; |
373 | nfmsg->res_id = htons(queue->queue_num); | |
374 | ||
5863702a ED |
375 | nla = __nla_reserve(skb, NFQA_PACKET_HDR, sizeof(*pmsg)); |
376 | pmsg = nla_data(nla); | |
377 | pmsg->hw_protocol = entskb->protocol; | |
1d1de89b | 378 | pmsg->hook = entry->state.hook; |
5863702a | 379 | *packet_id_ptr = &pmsg->packet_id; |
7af4cc3f | 380 | |
1d1de89b | 381 | indev = entry->state.in; |
3e4ead4f | 382 | if (indev) { |
1109a90c | 383 | #if !IS_ENABLED(CONFIG_BRIDGE_NETFILTER) |
a447189e DM |
384 | if (nla_put_be32(skb, NFQA_IFINDEX_INDEV, htonl(indev->ifindex))) |
385 | goto nla_put_failure; | |
fbcd923c | 386 | #else |
1d1de89b | 387 | if (entry->state.pf == PF_BRIDGE) { |
fbcd923c | 388 | /* Case 1: indev is physical input device, we need to |
601e68e1 | 389 | * look for bridge group (when called from |
fbcd923c | 390 | * netfilter_bridge) */ |
a447189e DM |
391 | if (nla_put_be32(skb, NFQA_IFINDEX_PHYSINDEV, |
392 | htonl(indev->ifindex)) || | |
fbcd923c | 393 | /* this is the bridge group "brX" */ |
f350a0a8 | 394 | /* rcu_read_lock()ed by __nf_queue */ |
a447189e DM |
395 | nla_put_be32(skb, NFQA_IFINDEX_INDEV, |
396 | htonl(br_port_get_rcu(indev)->br->dev->ifindex))) | |
397 | goto nla_put_failure; | |
fbcd923c | 398 | } else { |
c737b7c4 FW |
399 | int physinif; |
400 | ||
fbcd923c HW |
401 | /* Case 2: indev is bridge group, we need to look for |
402 | * physical device (when called from ipv4) */ | |
a447189e DM |
403 | if (nla_put_be32(skb, NFQA_IFINDEX_INDEV, |
404 | htonl(indev->ifindex))) | |
405 | goto nla_put_failure; | |
c737b7c4 FW |
406 | |
407 | physinif = nf_bridge_get_physinif(entskb); | |
408 | if (physinif && | |
a447189e | 409 | nla_put_be32(skb, NFQA_IFINDEX_PHYSINDEV, |
c737b7c4 | 410 | htonl(physinif))) |
a447189e | 411 | goto nla_put_failure; |
fbcd923c HW |
412 | } |
413 | #endif | |
7af4cc3f HW |
414 | } |
415 | ||
3e4ead4f | 416 | if (outdev) { |
1109a90c | 417 | #if !IS_ENABLED(CONFIG_BRIDGE_NETFILTER) |
a447189e DM |
418 | if (nla_put_be32(skb, NFQA_IFINDEX_OUTDEV, htonl(outdev->ifindex))) |
419 | goto nla_put_failure; | |
fbcd923c | 420 | #else |
1d1de89b | 421 | if (entry->state.pf == PF_BRIDGE) { |
fbcd923c | 422 | /* Case 1: outdev is physical output device, we need to |
601e68e1 | 423 | * look for bridge group (when called from |
fbcd923c | 424 | * netfilter_bridge) */ |
a447189e DM |
425 | if (nla_put_be32(skb, NFQA_IFINDEX_PHYSOUTDEV, |
426 | htonl(outdev->ifindex)) || | |
fbcd923c | 427 | /* this is the bridge group "brX" */ |
f350a0a8 | 428 | /* rcu_read_lock()ed by __nf_queue */ |
a447189e DM |
429 | nla_put_be32(skb, NFQA_IFINDEX_OUTDEV, |
430 | htonl(br_port_get_rcu(outdev)->br->dev->ifindex))) | |
431 | goto nla_put_failure; | |
fbcd923c | 432 | } else { |
c737b7c4 FW |
433 | int physoutif; |
434 | ||
fbcd923c HW |
435 | /* Case 2: outdev is bridge group, we need to look for |
436 | * physical output device (when called from ipv4) */ | |
a447189e DM |
437 | if (nla_put_be32(skb, NFQA_IFINDEX_OUTDEV, |
438 | htonl(outdev->ifindex))) | |
439 | goto nla_put_failure; | |
c737b7c4 FW |
440 | |
441 | physoutif = nf_bridge_get_physoutif(entskb); | |
442 | if (physoutif && | |
a447189e | 443 | nla_put_be32(skb, NFQA_IFINDEX_PHYSOUTDEV, |
c737b7c4 | 444 | htonl(physoutif))) |
a447189e | 445 | goto nla_put_failure; |
fbcd923c HW |
446 | } |
447 | #endif | |
7af4cc3f HW |
448 | } |
449 | ||
a447189e DM |
450 | if (entskb->mark && |
451 | nla_put_be32(skb, NFQA_MARK, htonl(entskb->mark))) | |
452 | goto nla_put_failure; | |
7af4cc3f | 453 | |
2c38de4c NC |
454 | if (indev && entskb->dev && |
455 | entskb->mac_header != entskb->network_header) { | |
7af4cc3f | 456 | struct nfqnl_msg_packet_hw phw; |
e4d091d7 DC |
457 | int len; |
458 | ||
459 | memset(&phw, 0, sizeof(phw)); | |
460 | len = dev_parse_header(entskb, phw.hw_addr); | |
b95cce35 SH |
461 | if (len) { |
462 | phw.hw_addrlen = htons(len); | |
a447189e DM |
463 | if (nla_put(skb, NFQA_HWADDR, sizeof(phw), &phw)) |
464 | goto nla_put_failure; | |
b95cce35 | 465 | } |
7af4cc3f HW |
466 | } |
467 | ||
b7aa0bf7 | 468 | if (entskb->tstamp.tv64) { |
7af4cc3f | 469 | struct nfqnl_msg_packet_timestamp ts; |
b7aa0bf7 ED |
470 | struct timeval tv = ktime_to_timeval(entskb->tstamp); |
471 | ts.sec = cpu_to_be64(tv.tv_sec); | |
472 | ts.usec = cpu_to_be64(tv.tv_usec); | |
7af4cc3f | 473 | |
a447189e DM |
474 | if (nla_put(skb, NFQA_TIMESTAMP, sizeof(ts), &ts)) |
475 | goto nla_put_failure; | |
7af4cc3f HW |
476 | } |
477 | ||
08c0cad6 VG |
478 | if ((queue->flags & NFQA_CFG_F_UID_GID) && entskb->sk && |
479 | nfqnl_put_sk_uidgid(skb, entskb->sk) < 0) | |
480 | goto nla_put_failure; | |
481 | ||
ae08ce00 ED |
482 | if (ct && nfqnl_ct_put(skb, ct, ctinfo) < 0) |
483 | goto nla_put_failure; | |
484 | ||
7f87712c FW |
485 | if (cap_len > data_len && |
486 | nla_put_be32(skb, NFQA_CAP_LEN, htonl(cap_len))) | |
ae08ce00 ED |
487 | goto nla_put_failure; |
488 | ||
496e4ae7 | 489 | if (nfqnl_put_packet_info(skb, entskb, csum_verify)) |
7237190d FW |
490 | goto nla_put_failure; |
491 | ||
7af4cc3f | 492 | if (data_len) { |
df6fb868 | 493 | struct nlattr *nla; |
7af4cc3f | 494 | |
ae08ce00 ED |
495 | if (skb_tailroom(skb) < sizeof(*nla) + hlen) |
496 | goto nla_put_failure; | |
7af4cc3f | 497 | |
ae08ce00 | 498 | nla = (struct nlattr *)skb_put(skb, sizeof(*nla)); |
df6fb868 | 499 | nla->nla_type = NFQA_PAYLOAD; |
ae08ce00 | 500 | nla->nla_len = nla_attr_size(data_len); |
7af4cc3f | 501 | |
36d5fe6a ZK |
502 | if (skb_zerocopy(skb, entskb, data_len, hlen)) |
503 | goto nla_put_failure; | |
7af4cc3f | 504 | } |
601e68e1 | 505 | |
ae08ce00 | 506 | nlh->nlmsg_len = skb->len; |
7af4cc3f HW |
507 | return skb; |
508 | ||
df6fb868 | 509 | nla_put_failure: |
36d5fe6a | 510 | skb_tx_error(entskb); |
a6729955 | 511 | kfree_skb(skb); |
e87cc472 | 512 | net_err_ratelimited("nf_queue: error creating packet message\n"); |
7af4cc3f HW |
513 | return NULL; |
514 | } | |
515 | ||
516 | static int | |
a5fedd43 FW |
517 | __nfqnl_enqueue_packet(struct net *net, struct nfqnl_instance *queue, |
518 | struct nf_queue_entry *entry) | |
7af4cc3f | 519 | { |
7af4cc3f | 520 | struct sk_buff *nskb; |
f1585086 | 521 | int err = -ENOBUFS; |
5863702a | 522 | __be32 *packet_id_ptr; |
fdb694a0 | 523 | int failopen = 0; |
7af4cc3f | 524 | |
74332687 | 525 | nskb = nfqnl_build_packet_message(net, queue, entry, &packet_id_ptr); |
f1585086 FW |
526 | if (nskb == NULL) { |
527 | err = -ENOMEM; | |
0ef0f465 | 528 | goto err_out; |
f1585086 | 529 | } |
7af4cc3f | 530 | spin_lock_bh(&queue->lock); |
601e68e1 | 531 | |
7af4cc3f | 532 | if (queue->queue_total >= queue->queue_maxlen) { |
fdb694a0 KK |
533 | if (queue->flags & NFQA_CFG_F_FAIL_OPEN) { |
534 | failopen = 1; | |
535 | err = 0; | |
536 | } else { | |
537 | queue->queue_dropped++; | |
538 | net_warn_ratelimited("nf_queue: full at %d entries, dropping packets(s)\n", | |
539 | queue->queue_total); | |
540 | } | |
7af4cc3f HW |
541 | goto err_out_free_nskb; |
542 | } | |
5863702a ED |
543 | entry->id = ++queue->id_sequence; |
544 | *packet_id_ptr = htonl(entry->id); | |
7af4cc3f HW |
545 | |
546 | /* nfnetlink_unicast will either free the nskb or add it to a socket */ | |
e8179610 | 547 | err = nfnetlink_unicast(nskb, net, queue->peer_portid, MSG_DONTWAIT); |
0ef0f465 | 548 | if (err < 0) { |
601e68e1 | 549 | queue->queue_user_dropped++; |
7af4cc3f HW |
550 | goto err_out_unlock; |
551 | } | |
552 | ||
553 | __enqueue_entry(queue, entry); | |
554 | ||
555 | spin_unlock_bh(&queue->lock); | |
0ef0f465 | 556 | return 0; |
7af4cc3f HW |
557 | |
558 | err_out_free_nskb: | |
601e68e1 | 559 | kfree_skb(nskb); |
7af4cc3f HW |
560 | err_out_unlock: |
561 | spin_unlock_bh(&queue->lock); | |
fdb694a0 KK |
562 | if (failopen) |
563 | nf_reinject(entry, NF_ACCEPT); | |
0ef0f465 | 564 | err_out: |
f1585086 | 565 | return err; |
7af4cc3f HW |
566 | } |
567 | ||
a5fedd43 FW |
568 | static struct nf_queue_entry * |
569 | nf_queue_entry_dup(struct nf_queue_entry *e) | |
570 | { | |
571 | struct nf_queue_entry *entry = kmemdup(e, e->size, GFP_ATOMIC); | |
572 | if (entry) { | |
573 | if (nf_queue_entry_get_refs(entry)) | |
574 | return entry; | |
575 | kfree(entry); | |
576 | } | |
577 | return NULL; | |
578 | } | |
579 | ||
1109a90c | 580 | #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER) |
a5fedd43 FW |
581 | /* When called from bridge netfilter, skb->data must point to MAC header |
582 | * before calling skb_gso_segment(). Else, original MAC header is lost | |
583 | * and segmented skbs will be sent to wrong destination. | |
584 | */ | |
585 | static void nf_bridge_adjust_skb_data(struct sk_buff *skb) | |
586 | { | |
587 | if (skb->nf_bridge) | |
588 | __skb_push(skb, skb->network_header - skb->mac_header); | |
589 | } | |
590 | ||
591 | static void nf_bridge_adjust_segmented_data(struct sk_buff *skb) | |
592 | { | |
593 | if (skb->nf_bridge) | |
594 | __skb_pull(skb, skb->network_header - skb->mac_header); | |
595 | } | |
596 | #else | |
597 | #define nf_bridge_adjust_skb_data(s) do {} while (0) | |
598 | #define nf_bridge_adjust_segmented_data(s) do {} while (0) | |
599 | #endif | |
600 | ||
601 | static void free_entry(struct nf_queue_entry *entry) | |
602 | { | |
603 | nf_queue_entry_release_refs(entry); | |
604 | kfree(entry); | |
605 | } | |
606 | ||
607 | static int | |
608 | __nfqnl_enqueue_packet_gso(struct net *net, struct nfqnl_instance *queue, | |
609 | struct sk_buff *skb, struct nf_queue_entry *entry) | |
610 | { | |
611 | int ret = -ENOMEM; | |
612 | struct nf_queue_entry *entry_seg; | |
613 | ||
614 | nf_bridge_adjust_segmented_data(skb); | |
615 | ||
616 | if (skb->next == NULL) { /* last packet, no need to copy entry */ | |
617 | struct sk_buff *gso_skb = entry->skb; | |
618 | entry->skb = skb; | |
619 | ret = __nfqnl_enqueue_packet(net, queue, entry); | |
620 | if (ret) | |
621 | entry->skb = gso_skb; | |
622 | return ret; | |
623 | } | |
624 | ||
625 | skb->next = NULL; | |
626 | ||
627 | entry_seg = nf_queue_entry_dup(entry); | |
628 | if (entry_seg) { | |
629 | entry_seg->skb = skb; | |
630 | ret = __nfqnl_enqueue_packet(net, queue, entry_seg); | |
631 | if (ret) | |
632 | free_entry(entry_seg); | |
633 | } | |
634 | return ret; | |
635 | } | |
636 | ||
637 | static int | |
638 | nfqnl_enqueue_packet(struct nf_queue_entry *entry, unsigned int queuenum) | |
639 | { | |
640 | unsigned int queued; | |
641 | struct nfqnl_instance *queue; | |
642 | struct sk_buff *skb, *segs; | |
643 | int err = -ENOBUFS; | |
1d1de89b DM |
644 | struct net *net = dev_net(entry->state.in ? |
645 | entry->state.in : entry->state.out); | |
a5fedd43 FW |
646 | struct nfnl_queue_net *q = nfnl_queue_pernet(net); |
647 | ||
648 | /* rcu_read_lock()ed by nf_hook_slow() */ | |
649 | queue = instance_lookup(q, queuenum); | |
650 | if (!queue) | |
651 | return -ESRCH; | |
652 | ||
653 | if (queue->copy_mode == NFQNL_COPY_NONE) | |
654 | return -EINVAL; | |
655 | ||
a5fedd43 FW |
656 | skb = entry->skb; |
657 | ||
1d1de89b | 658 | switch (entry->state.pf) { |
a5fedd43 FW |
659 | case NFPROTO_IPV4: |
660 | skb->protocol = htons(ETH_P_IP); | |
661 | break; | |
662 | case NFPROTO_IPV6: | |
663 | skb->protocol = htons(ETH_P_IPV6); | |
664 | break; | |
665 | } | |
666 | ||
7b8dfe28 PNA |
667 | if ((queue->flags & NFQA_CFG_F_GSO) || !skb_is_gso(skb)) |
668 | return __nfqnl_enqueue_packet(net, queue, entry); | |
669 | ||
a5fedd43 FW |
670 | nf_bridge_adjust_skb_data(skb); |
671 | segs = skb_gso_segment(skb, 0); | |
672 | /* Does not use PTR_ERR to limit the number of error codes that can be | |
673 | * returned by nf_queue. For instance, callers rely on -ECANCELED to | |
674 | * mean 'ignore this hook'. | |
675 | */ | |
330966e5 | 676 | if (IS_ERR_OR_NULL(segs)) |
a5fedd43 FW |
677 | goto out_err; |
678 | queued = 0; | |
679 | err = 0; | |
680 | do { | |
681 | struct sk_buff *nskb = segs->next; | |
682 | if (err == 0) | |
683 | err = __nfqnl_enqueue_packet_gso(net, queue, | |
684 | segs, entry); | |
685 | if (err == 0) | |
686 | queued++; | |
687 | else | |
688 | kfree_skb(segs); | |
689 | segs = nskb; | |
690 | } while (segs); | |
691 | ||
692 | if (queued) { | |
693 | if (err) /* some segments are already queued */ | |
694 | free_entry(entry); | |
695 | kfree_skb(skb); | |
696 | return 0; | |
697 | } | |
698 | out_err: | |
699 | nf_bridge_adjust_segmented_data(skb); | |
700 | return err; | |
701 | } | |
702 | ||
7af4cc3f | 703 | static int |
8c88f87c | 704 | nfqnl_mangle(void *data, int data_len, struct nf_queue_entry *e, int diff) |
7af4cc3f | 705 | { |
e2b58a67 | 706 | struct sk_buff *nskb; |
7af4cc3f | 707 | |
d8a585d7 PM |
708 | if (diff < 0) { |
709 | if (pskb_trim(e->skb, data_len)) | |
710 | return -ENOMEM; | |
711 | } else if (diff > 0) { | |
7af4cc3f HW |
712 | if (data_len > 0xFFFF) |
713 | return -EINVAL; | |
714 | if (diff > skb_tailroom(e->skb)) { | |
9a732ed6 AE |
715 | nskb = skb_copy_expand(e->skb, skb_headroom(e->skb), |
716 | diff, GFP_ATOMIC); | |
e2b58a67 | 717 | if (!nskb) { |
1158ba27 | 718 | printk(KERN_WARNING "nf_queue: OOM " |
7af4cc3f | 719 | "in mangle, dropping packet\n"); |
e2b58a67 | 720 | return -ENOMEM; |
7af4cc3f | 721 | } |
e2b58a67 PM |
722 | kfree_skb(e->skb); |
723 | e->skb = nskb; | |
7af4cc3f HW |
724 | } |
725 | skb_put(e->skb, diff); | |
726 | } | |
37d41879 | 727 | if (!skb_make_writable(e->skb, data_len)) |
7af4cc3f | 728 | return -ENOMEM; |
27d7ff46 | 729 | skb_copy_to_linear_data(e->skb, data, data_len); |
e7dfb09a | 730 | e->skb->ip_summed = CHECKSUM_NONE; |
7af4cc3f HW |
731 | return 0; |
732 | } | |
733 | ||
7af4cc3f HW |
734 | static int |
735 | nfqnl_set_mode(struct nfqnl_instance *queue, | |
736 | unsigned char mode, unsigned int range) | |
737 | { | |
c5de0dfd | 738 | int status = 0; |
7af4cc3f HW |
739 | |
740 | spin_lock_bh(&queue->lock); | |
c5de0dfd PM |
741 | switch (mode) { |
742 | case NFQNL_COPY_NONE: | |
743 | case NFQNL_COPY_META: | |
744 | queue->copy_mode = mode; | |
745 | queue->copy_range = 0; | |
746 | break; | |
747 | ||
748 | case NFQNL_COPY_PACKET: | |
749 | queue->copy_mode = mode; | |
9cefbbc9 FW |
750 | if (range == 0 || range > NFQNL_MAX_COPY_RANGE) |
751 | queue->copy_range = NFQNL_MAX_COPY_RANGE; | |
c5de0dfd PM |
752 | else |
753 | queue->copy_range = range; | |
754 | break; | |
755 | ||
756 | default: | |
757 | status = -EINVAL; | |
758 | ||
759 | } | |
7af4cc3f HW |
760 | spin_unlock_bh(&queue->lock); |
761 | ||
762 | return status; | |
763 | } | |
764 | ||
765 | static int | |
02f014d8 | 766 | dev_cmp(struct nf_queue_entry *entry, unsigned long ifindex) |
7af4cc3f | 767 | { |
1d1de89b DM |
768 | if (entry->state.in) |
769 | if (entry->state.in->ifindex == ifindex) | |
7af4cc3f | 770 | return 1; |
1d1de89b DM |
771 | if (entry->state.out) |
772 | if (entry->state.out->ifindex == ifindex) | |
7af4cc3f | 773 | return 1; |
1109a90c | 774 | #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER) |
ef47c6a7 | 775 | if (entry->skb->nf_bridge) { |
c737b7c4 FW |
776 | int physinif, physoutif; |
777 | ||
778 | physinif = nf_bridge_get_physinif(entry->skb); | |
779 | physoutif = nf_bridge_get_physoutif(entry->skb); | |
780 | ||
781 | if (physinif == ifindex || physoutif == ifindex) | |
ef47c6a7 PM |
782 | return 1; |
783 | } | |
784 | #endif | |
7af4cc3f HW |
785 | return 0; |
786 | } | |
787 | ||
788 | /* drop all packets with either indev or outdev == ifindex from all queue | |
789 | * instances */ | |
790 | static void | |
e8179610 | 791 | nfqnl_dev_drop(struct net *net, int ifindex) |
7af4cc3f HW |
792 | { |
793 | int i; | |
e8179610 | 794 | struct nfnl_queue_net *q = nfnl_queue_pernet(net); |
601e68e1 | 795 | |
9872bec7 | 796 | rcu_read_lock(); |
7af4cc3f | 797 | |
9872bec7 | 798 | for (i = 0; i < INSTANCE_BUCKETS; i++) { |
7af4cc3f | 799 | struct nfqnl_instance *inst; |
e8179610 | 800 | struct hlist_head *head = &q->instance_table[i]; |
7af4cc3f | 801 | |
b67bfe0d | 802 | hlist_for_each_entry_rcu(inst, head, hlist) |
b43d8d85 | 803 | nfqnl_flush(inst, dev_cmp, ifindex); |
7af4cc3f HW |
804 | } |
805 | ||
9872bec7 | 806 | rcu_read_unlock(); |
7af4cc3f HW |
807 | } |
808 | ||
809 | #define RCV_SKB_FAIL(err) do { netlink_ack(skb, nlh, (err)); return; } while (0) | |
810 | ||
811 | static int | |
812 | nfqnl_rcv_dev_event(struct notifier_block *this, | |
813 | unsigned long event, void *ptr) | |
814 | { | |
351638e7 | 815 | struct net_device *dev = netdev_notifier_info_to_dev(ptr); |
7af4cc3f HW |
816 | |
817 | /* Drop any packets associated with the downed device */ | |
818 | if (event == NETDEV_DOWN) | |
e8179610 | 819 | nfqnl_dev_drop(dev_net(dev), dev->ifindex); |
7af4cc3f HW |
820 | return NOTIFY_DONE; |
821 | } | |
822 | ||
823 | static struct notifier_block nfqnl_dev_notifier = { | |
824 | .notifier_call = nfqnl_rcv_dev_event, | |
825 | }; | |
826 | ||
827 | static int | |
828 | nfqnl_rcv_nl_event(struct notifier_block *this, | |
829 | unsigned long event, void *ptr) | |
830 | { | |
831 | struct netlink_notify *n = ptr; | |
e8179610 | 832 | struct nfnl_queue_net *q = nfnl_queue_pernet(n->net); |
7af4cc3f | 833 | |
dee5817e | 834 | if (event == NETLINK_URELEASE && n->protocol == NETLINK_NETFILTER) { |
7af4cc3f HW |
835 | int i; |
836 | ||
15e47304 | 837 | /* destroy all instances for this portid */ |
e8179610 | 838 | spin_lock(&q->instances_lock); |
9872bec7 | 839 | for (i = 0; i < INSTANCE_BUCKETS; i++) { |
b67bfe0d | 840 | struct hlist_node *t2; |
7af4cc3f | 841 | struct nfqnl_instance *inst; |
e8179610 | 842 | struct hlist_head *head = &q->instance_table[i]; |
7af4cc3f | 843 | |
b67bfe0d | 844 | hlist_for_each_entry_safe(inst, t2, head, hlist) { |
e8179610 | 845 | if (n->portid == inst->peer_portid) |
7af4cc3f HW |
846 | __instance_destroy(inst); |
847 | } | |
848 | } | |
e8179610 | 849 | spin_unlock(&q->instances_lock); |
7af4cc3f HW |
850 | } |
851 | return NOTIFY_DONE; | |
852 | } | |
853 | ||
854 | static struct notifier_block nfqnl_rtnl_notifier = { | |
855 | .notifier_call = nfqnl_rcv_nl_event, | |
856 | }; | |
857 | ||
5bf75853 PM |
858 | static const struct nla_policy nfqa_verdict_policy[NFQA_MAX+1] = { |
859 | [NFQA_VERDICT_HDR] = { .len = sizeof(struct nfqnl_msg_verdict_hdr) }, | |
860 | [NFQA_MARK] = { .type = NLA_U32 }, | |
861 | [NFQA_PAYLOAD] = { .type = NLA_UNSPEC }, | |
9cb01766 | 862 | [NFQA_CT] = { .type = NLA_UNSPEC }, |
bd077937 | 863 | [NFQA_EXP] = { .type = NLA_UNSPEC }, |
838ab636 HW |
864 | }; |
865 | ||
97d32cf9 FW |
866 | static const struct nla_policy nfqa_verdict_batch_policy[NFQA_MAX+1] = { |
867 | [NFQA_VERDICT_HDR] = { .len = sizeof(struct nfqnl_msg_verdict_hdr) }, | |
868 | [NFQA_MARK] = { .type = NLA_U32 }, | |
869 | }; | |
870 | ||
e8179610 | 871 | static struct nfqnl_instance * |
cc6bc448 | 872 | verdict_instance_lookup(struct nfnl_queue_net *q, u16 queue_num, u32 nlportid) |
97d32cf9 FW |
873 | { |
874 | struct nfqnl_instance *queue; | |
875 | ||
e8179610 | 876 | queue = instance_lookup(q, queue_num); |
97d32cf9 FW |
877 | if (!queue) |
878 | return ERR_PTR(-ENODEV); | |
879 | ||
15e47304 | 880 | if (queue->peer_portid != nlportid) |
97d32cf9 FW |
881 | return ERR_PTR(-EPERM); |
882 | ||
883 | return queue; | |
884 | } | |
885 | ||
886 | static struct nfqnl_msg_verdict_hdr* | |
887 | verdicthdr_get(const struct nlattr * const nfqa[]) | |
888 | { | |
889 | struct nfqnl_msg_verdict_hdr *vhdr; | |
890 | unsigned int verdict; | |
891 | ||
892 | if (!nfqa[NFQA_VERDICT_HDR]) | |
893 | return NULL; | |
894 | ||
895 | vhdr = nla_data(nfqa[NFQA_VERDICT_HDR]); | |
c6675233 FW |
896 | verdict = ntohl(vhdr->verdict) & NF_VERDICT_MASK; |
897 | if (verdict > NF_MAX_VERDICT || verdict == NF_STOLEN) | |
97d32cf9 FW |
898 | return NULL; |
899 | return vhdr; | |
900 | } | |
901 | ||
902 | static int nfq_id_after(unsigned int id, unsigned int max) | |
903 | { | |
904 | return (int)(id - max) > 0; | |
905 | } | |
906 | ||
907 | static int | |
908 | nfqnl_recv_verdict_batch(struct sock *ctnl, struct sk_buff *skb, | |
909 | const struct nlmsghdr *nlh, | |
910 | const struct nlattr * const nfqa[]) | |
911 | { | |
3da07c0c | 912 | struct nfgenmsg *nfmsg = nlmsg_data(nlh); |
97d32cf9 FW |
913 | struct nf_queue_entry *entry, *tmp; |
914 | unsigned int verdict, maxid; | |
915 | struct nfqnl_msg_verdict_hdr *vhdr; | |
916 | struct nfqnl_instance *queue; | |
917 | LIST_HEAD(batch_list); | |
918 | u16 queue_num = ntohs(nfmsg->res_id); | |
919 | ||
e8179610 G |
920 | struct net *net = sock_net(ctnl); |
921 | struct nfnl_queue_net *q = nfnl_queue_pernet(net); | |
922 | ||
923 | queue = verdict_instance_lookup(q, queue_num, | |
924 | NETLINK_CB(skb).portid); | |
97d32cf9 FW |
925 | if (IS_ERR(queue)) |
926 | return PTR_ERR(queue); | |
927 | ||
928 | vhdr = verdicthdr_get(nfqa); | |
929 | if (!vhdr) | |
930 | return -EINVAL; | |
931 | ||
932 | verdict = ntohl(vhdr->verdict); | |
933 | maxid = ntohl(vhdr->id); | |
934 | ||
935 | spin_lock_bh(&queue->lock); | |
936 | ||
937 | list_for_each_entry_safe(entry, tmp, &queue->queue_list, list) { | |
938 | if (nfq_id_after(entry->id, maxid)) | |
939 | break; | |
940 | __dequeue_entry(queue, entry); | |
941 | list_add_tail(&entry->list, &batch_list); | |
942 | } | |
943 | ||
944 | spin_unlock_bh(&queue->lock); | |
945 | ||
946 | if (list_empty(&batch_list)) | |
947 | return -ENOENT; | |
948 | ||
949 | list_for_each_entry_safe(entry, tmp, &batch_list, list) { | |
950 | if (nfqa[NFQA_MARK]) | |
951 | entry->skb->mark = ntohl(nla_get_be32(nfqa[NFQA_MARK])); | |
952 | nf_reinject(entry, verdict); | |
953 | } | |
954 | return 0; | |
955 | } | |
956 | ||
7af4cc3f HW |
957 | static int |
958 | nfqnl_recv_verdict(struct sock *ctnl, struct sk_buff *skb, | |
39938324 PM |
959 | const struct nlmsghdr *nlh, |
960 | const struct nlattr * const nfqa[]) | |
7af4cc3f | 961 | { |
3da07c0c | 962 | struct nfgenmsg *nfmsg = nlmsg_data(nlh); |
7af4cc3f HW |
963 | u_int16_t queue_num = ntohs(nfmsg->res_id); |
964 | ||
965 | struct nfqnl_msg_verdict_hdr *vhdr; | |
966 | struct nfqnl_instance *queue; | |
967 | unsigned int verdict; | |
02f014d8 | 968 | struct nf_queue_entry *entry; |
8c88f87c PNA |
969 | enum ip_conntrack_info uninitialized_var(ctinfo); |
970 | struct nf_conn *ct = NULL; | |
7af4cc3f | 971 | |
e8179610 G |
972 | struct net *net = sock_net(ctnl); |
973 | struct nfnl_queue_net *q = nfnl_queue_pernet(net); | |
7af4cc3f | 974 | |
e8179610 G |
975 | queue = instance_lookup(q, queue_num); |
976 | if (!queue) | |
977 | queue = verdict_instance_lookup(q, queue_num, | |
978 | NETLINK_CB(skb).portid); | |
97d32cf9 FW |
979 | if (IS_ERR(queue)) |
980 | return PTR_ERR(queue); | |
7af4cc3f | 981 | |
97d32cf9 FW |
982 | vhdr = verdicthdr_get(nfqa); |
983 | if (!vhdr) | |
84a797dd | 984 | return -EINVAL; |
7af4cc3f | 985 | |
7af4cc3f HW |
986 | verdict = ntohl(vhdr->verdict); |
987 | ||
b43d8d85 | 988 | entry = find_dequeue_entry(queue, ntohl(vhdr->id)); |
84a797dd ED |
989 | if (entry == NULL) |
990 | return -ENOENT; | |
7af4cc3f | 991 | |
bd077937 | 992 | if (nfqa[NFQA_CT]) { |
7c622345 | 993 | ct = nfqnl_ct_parse(entry->skb, nfqa[NFQA_CT], &ctinfo); |
bd077937 PNA |
994 | if (ct && nfqa[NFQA_EXP]) { |
995 | nfqnl_attach_expect(ct, nfqa[NFQA_EXP], | |
996 | NETLINK_CB(skb).portid, | |
997 | nlmsg_report(nlh)); | |
998 | } | |
999 | } | |
9cb01766 | 1000 | |
df6fb868 | 1001 | if (nfqa[NFQA_PAYLOAD]) { |
8c88f87c PNA |
1002 | u16 payload_len = nla_len(nfqa[NFQA_PAYLOAD]); |
1003 | int diff = payload_len - entry->skb->len; | |
1004 | ||
df6fb868 | 1005 | if (nfqnl_mangle(nla_data(nfqa[NFQA_PAYLOAD]), |
8c88f87c | 1006 | payload_len, entry, diff) < 0) |
7af4cc3f | 1007 | verdict = NF_DROP; |
8c88f87c | 1008 | |
7c622345 | 1009 | if (ct) |
0a0d80eb | 1010 | nfqnl_ct_seq_adjust(entry->skb, ct, ctinfo, diff); |
7af4cc3f HW |
1011 | } |
1012 | ||
df6fb868 | 1013 | if (nfqa[NFQA_MARK]) |
ea3a66ff | 1014 | entry->skb->mark = ntohl(nla_get_be32(nfqa[NFQA_MARK])); |
601e68e1 | 1015 | |
4b3d15ef | 1016 | nf_reinject(entry, verdict); |
7af4cc3f HW |
1017 | return 0; |
1018 | } | |
1019 | ||
1020 | static int | |
1021 | nfqnl_recv_unsupp(struct sock *ctnl, struct sk_buff *skb, | |
39938324 PM |
1022 | const struct nlmsghdr *nlh, |
1023 | const struct nlattr * const nfqa[]) | |
7af4cc3f HW |
1024 | { |
1025 | return -ENOTSUPP; | |
1026 | } | |
1027 | ||
5bf75853 PM |
1028 | static const struct nla_policy nfqa_cfg_policy[NFQA_CFG_MAX+1] = { |
1029 | [NFQA_CFG_CMD] = { .len = sizeof(struct nfqnl_msg_config_cmd) }, | |
1030 | [NFQA_CFG_PARAMS] = { .len = sizeof(struct nfqnl_msg_config_params) }, | |
838ab636 HW |
1031 | }; |
1032 | ||
e3ac5298 | 1033 | static const struct nf_queue_handler nfqh = { |
bbd86b9f HW |
1034 | .outfn = &nfqnl_enqueue_packet, |
1035 | }; | |
1036 | ||
7af4cc3f HW |
1037 | static int |
1038 | nfqnl_recv_config(struct sock *ctnl, struct sk_buff *skb, | |
39938324 PM |
1039 | const struct nlmsghdr *nlh, |
1040 | const struct nlattr * const nfqa[]) | |
7af4cc3f | 1041 | { |
3da07c0c | 1042 | struct nfgenmsg *nfmsg = nlmsg_data(nlh); |
7af4cc3f HW |
1043 | u_int16_t queue_num = ntohs(nfmsg->res_id); |
1044 | struct nfqnl_instance *queue; | |
9872bec7 | 1045 | struct nfqnl_msg_config_cmd *cmd = NULL; |
e8179610 G |
1046 | struct net *net = sock_net(ctnl); |
1047 | struct nfnl_queue_net *q = nfnl_queue_pernet(net); | |
838ab636 | 1048 | int ret = 0; |
7af4cc3f | 1049 | |
9872bec7 PM |
1050 | if (nfqa[NFQA_CFG_CMD]) { |
1051 | cmd = nla_data(nfqa[NFQA_CFG_CMD]); | |
1052 | ||
0360ae41 | 1053 | /* Obsolete commands without queue context */ |
9872bec7 | 1054 | switch (cmd->command) { |
0360ae41 FW |
1055 | case NFQNL_CFG_CMD_PF_BIND: return 0; |
1056 | case NFQNL_CFG_CMD_PF_UNBIND: return 0; | |
9872bec7 | 1057 | } |
9872bec7 PM |
1058 | } |
1059 | ||
1060 | rcu_read_lock(); | |
e8179610 | 1061 | queue = instance_lookup(q, queue_num); |
15e47304 | 1062 | if (queue && queue->peer_portid != NETLINK_CB(skb).portid) { |
a3c8e7fd | 1063 | ret = -EPERM; |
9872bec7 | 1064 | goto err_out_unlock; |
a3c8e7fd PM |
1065 | } |
1066 | ||
9872bec7 | 1067 | if (cmd != NULL) { |
7af4cc3f HW |
1068 | switch (cmd->command) { |
1069 | case NFQNL_CFG_CMD_BIND: | |
9872bec7 PM |
1070 | if (queue) { |
1071 | ret = -EBUSY; | |
1072 | goto err_out_unlock; | |
1073 | } | |
e8179610 G |
1074 | queue = instance_create(q, queue_num, |
1075 | NETLINK_CB(skb).portid); | |
baab2ce7 PM |
1076 | if (IS_ERR(queue)) { |
1077 | ret = PTR_ERR(queue); | |
9872bec7 PM |
1078 | goto err_out_unlock; |
1079 | } | |
7af4cc3f HW |
1080 | break; |
1081 | case NFQNL_CFG_CMD_UNBIND: | |
9872bec7 PM |
1082 | if (!queue) { |
1083 | ret = -ENODEV; | |
1084 | goto err_out_unlock; | |
1085 | } | |
e8179610 | 1086 | instance_destroy(q, queue); |
7af4cc3f HW |
1087 | break; |
1088 | case NFQNL_CFG_CMD_PF_BIND: | |
7af4cc3f | 1089 | case NFQNL_CFG_CMD_PF_UNBIND: |
7af4cc3f HW |
1090 | break; |
1091 | default: | |
cd21f0ac | 1092 | ret = -ENOTSUPP; |
838ab636 | 1093 | break; |
7af4cc3f | 1094 | } |
7af4cc3f HW |
1095 | } |
1096 | ||
df6fb868 | 1097 | if (nfqa[NFQA_CFG_PARAMS]) { |
7af4cc3f | 1098 | struct nfqnl_msg_config_params *params; |
7af4cc3f | 1099 | |
406dbfc9 | 1100 | if (!queue) { |
a3c8e7fd | 1101 | ret = -ENODEV; |
9872bec7 | 1102 | goto err_out_unlock; |
406dbfc9 | 1103 | } |
df6fb868 | 1104 | params = nla_data(nfqa[NFQA_CFG_PARAMS]); |
7af4cc3f HW |
1105 | nfqnl_set_mode(queue, params->copy_mode, |
1106 | ntohl(params->copy_range)); | |
1107 | } | |
1108 | ||
df6fb868 | 1109 | if (nfqa[NFQA_CFG_QUEUE_MAXLEN]) { |
829e17a1 | 1110 | __be32 *queue_maxlen; |
a3c8e7fd PM |
1111 | |
1112 | if (!queue) { | |
1113 | ret = -ENODEV; | |
9872bec7 | 1114 | goto err_out_unlock; |
a3c8e7fd | 1115 | } |
df6fb868 | 1116 | queue_maxlen = nla_data(nfqa[NFQA_CFG_QUEUE_MAXLEN]); |
829e17a1 EL |
1117 | spin_lock_bh(&queue->lock); |
1118 | queue->queue_maxlen = ntohl(*queue_maxlen); | |
1119 | spin_unlock_bh(&queue->lock); | |
1120 | } | |
1121 | ||
fdb694a0 KK |
1122 | if (nfqa[NFQA_CFG_FLAGS]) { |
1123 | __u32 flags, mask; | |
1124 | ||
1125 | if (!queue) { | |
1126 | ret = -ENODEV; | |
1127 | goto err_out_unlock; | |
1128 | } | |
1129 | ||
1130 | if (!nfqa[NFQA_CFG_MASK]) { | |
1131 | /* A mask is needed to specify which flags are being | |
1132 | * changed. | |
1133 | */ | |
1134 | ret = -EINVAL; | |
1135 | goto err_out_unlock; | |
1136 | } | |
1137 | ||
1138 | flags = ntohl(nla_get_be32(nfqa[NFQA_CFG_FLAGS])); | |
1139 | mask = ntohl(nla_get_be32(nfqa[NFQA_CFG_MASK])); | |
1140 | ||
46ba5a25 KK |
1141 | if (flags >= NFQA_CFG_F_MAX) { |
1142 | ret = -EOPNOTSUPP; | |
1143 | goto err_out_unlock; | |
1144 | } | |
1145 | ||
fdb694a0 KK |
1146 | spin_lock_bh(&queue->lock); |
1147 | queue->flags &= ~mask; | |
1148 | queue->flags |= flags & mask; | |
1149 | spin_unlock_bh(&queue->lock); | |
1150 | } | |
1151 | ||
9872bec7 PM |
1152 | err_out_unlock: |
1153 | rcu_read_unlock(); | |
838ab636 | 1154 | return ret; |
7af4cc3f HW |
1155 | } |
1156 | ||
7c8d4cb4 | 1157 | static const struct nfnl_callback nfqnl_cb[NFQNL_MSG_MAX] = { |
84a797dd | 1158 | [NFQNL_MSG_PACKET] = { .call_rcu = nfqnl_recv_unsupp, |
37d2e7a2 | 1159 | .attr_count = NFQA_MAX, }, |
84a797dd | 1160 | [NFQNL_MSG_VERDICT] = { .call_rcu = nfqnl_recv_verdict, |
5bf75853 PM |
1161 | .attr_count = NFQA_MAX, |
1162 | .policy = nfqa_verdict_policy }, | |
7af4cc3f | 1163 | [NFQNL_MSG_CONFIG] = { .call = nfqnl_recv_config, |
5bf75853 PM |
1164 | .attr_count = NFQA_CFG_MAX, |
1165 | .policy = nfqa_cfg_policy }, | |
97d32cf9 FW |
1166 | [NFQNL_MSG_VERDICT_BATCH]={ .call_rcu = nfqnl_recv_verdict_batch, |
1167 | .attr_count = NFQA_MAX, | |
1168 | .policy = nfqa_verdict_batch_policy }, | |
7af4cc3f HW |
1169 | }; |
1170 | ||
7c8d4cb4 | 1171 | static const struct nfnetlink_subsystem nfqnl_subsys = { |
7af4cc3f HW |
1172 | .name = "nf_queue", |
1173 | .subsys_id = NFNL_SUBSYS_QUEUE, | |
1174 | .cb_count = NFQNL_MSG_MAX, | |
7af4cc3f HW |
1175 | .cb = nfqnl_cb, |
1176 | }; | |
1177 | ||
838ab636 HW |
1178 | #ifdef CONFIG_PROC_FS |
1179 | struct iter_state { | |
e8179610 | 1180 | struct seq_net_private p; |
838ab636 HW |
1181 | unsigned int bucket; |
1182 | }; | |
1183 | ||
1184 | static struct hlist_node *get_first(struct seq_file *seq) | |
1185 | { | |
1186 | struct iter_state *st = seq->private; | |
e8179610 G |
1187 | struct net *net; |
1188 | struct nfnl_queue_net *q; | |
838ab636 HW |
1189 | |
1190 | if (!st) | |
1191 | return NULL; | |
1192 | ||
e8179610 G |
1193 | net = seq_file_net(seq); |
1194 | q = nfnl_queue_pernet(net); | |
838ab636 | 1195 | for (st->bucket = 0; st->bucket < INSTANCE_BUCKETS; st->bucket++) { |
e8179610 G |
1196 | if (!hlist_empty(&q->instance_table[st->bucket])) |
1197 | return q->instance_table[st->bucket].first; | |
838ab636 HW |
1198 | } |
1199 | return NULL; | |
1200 | } | |
1201 | ||
1202 | static struct hlist_node *get_next(struct seq_file *seq, struct hlist_node *h) | |
1203 | { | |
1204 | struct iter_state *st = seq->private; | |
e8179610 | 1205 | struct net *net = seq_file_net(seq); |
838ab636 HW |
1206 | |
1207 | h = h->next; | |
1208 | while (!h) { | |
e8179610 G |
1209 | struct nfnl_queue_net *q; |
1210 | ||
838ab636 HW |
1211 | if (++st->bucket >= INSTANCE_BUCKETS) |
1212 | return NULL; | |
1213 | ||
e8179610 G |
1214 | q = nfnl_queue_pernet(net); |
1215 | h = q->instance_table[st->bucket].first; | |
838ab636 HW |
1216 | } |
1217 | return h; | |
1218 | } | |
1219 | ||
1220 | static struct hlist_node *get_idx(struct seq_file *seq, loff_t pos) | |
1221 | { | |
1222 | struct hlist_node *head; | |
1223 | head = get_first(seq); | |
1224 | ||
1225 | if (head) | |
1226 | while (pos && (head = get_next(seq, head))) | |
1227 | pos--; | |
1228 | return pos ? NULL : head; | |
1229 | } | |
1230 | ||
e8179610 G |
1231 | static void *seq_start(struct seq_file *s, loff_t *pos) |
1232 | __acquires(nfnl_queue_pernet(seq_file_net(s))->instances_lock) | |
838ab636 | 1233 | { |
e8179610 G |
1234 | spin_lock(&nfnl_queue_pernet(seq_file_net(s))->instances_lock); |
1235 | return get_idx(s, *pos); | |
838ab636 HW |
1236 | } |
1237 | ||
1238 | static void *seq_next(struct seq_file *s, void *v, loff_t *pos) | |
1239 | { | |
1240 | (*pos)++; | |
1241 | return get_next(s, v); | |
1242 | } | |
1243 | ||
1244 | static void seq_stop(struct seq_file *s, void *v) | |
e8179610 | 1245 | __releases(nfnl_queue_pernet(seq_file_net(s))->instances_lock) |
838ab636 | 1246 | { |
e8179610 | 1247 | spin_unlock(&nfnl_queue_pernet(seq_file_net(s))->instances_lock); |
838ab636 HW |
1248 | } |
1249 | ||
1250 | static int seq_show(struct seq_file *s, void *v) | |
1251 | { | |
1252 | const struct nfqnl_instance *inst = v; | |
1253 | ||
6b46f7b7 | 1254 | seq_printf(s, "%5u %6u %5u %1u %5u %5u %5u %8u %2d\n", |
e71456ae SRRH |
1255 | inst->queue_num, |
1256 | inst->peer_portid, inst->queue_total, | |
1257 | inst->copy_mode, inst->copy_range, | |
1258 | inst->queue_dropped, inst->queue_user_dropped, | |
1259 | inst->id_sequence, 1); | |
861fb107 | 1260 | return 0; |
838ab636 HW |
1261 | } |
1262 | ||
56b3d975 | 1263 | static const struct seq_operations nfqnl_seq_ops = { |
838ab636 HW |
1264 | .start = seq_start, |
1265 | .next = seq_next, | |
1266 | .stop = seq_stop, | |
1267 | .show = seq_show, | |
1268 | }; | |
1269 | ||
1270 | static int nfqnl_open(struct inode *inode, struct file *file) | |
1271 | { | |
e8179610 | 1272 | return seq_open_net(inode, file, &nfqnl_seq_ops, |
e2da5913 | 1273 | sizeof(struct iter_state)); |
838ab636 HW |
1274 | } |
1275 | ||
da7071d7 | 1276 | static const struct file_operations nfqnl_file_ops = { |
838ab636 HW |
1277 | .owner = THIS_MODULE, |
1278 | .open = nfqnl_open, | |
1279 | .read = seq_read, | |
1280 | .llseek = seq_lseek, | |
e8179610 | 1281 | .release = seq_release_net, |
838ab636 HW |
1282 | }; |
1283 | ||
1284 | #endif /* PROC_FS */ | |
1285 | ||
e8179610 | 1286 | static int __net_init nfnl_queue_net_init(struct net *net) |
7af4cc3f | 1287 | { |
e8179610 G |
1288 | unsigned int i; |
1289 | struct nfnl_queue_net *q = nfnl_queue_pernet(net); | |
601e68e1 | 1290 | |
838ab636 | 1291 | for (i = 0; i < INSTANCE_BUCKETS; i++) |
e8179610 G |
1292 | INIT_HLIST_HEAD(&q->instance_table[i]); |
1293 | ||
1294 | spin_lock_init(&q->instances_lock); | |
1295 | ||
1296 | #ifdef CONFIG_PROC_FS | |
1297 | if (!proc_create("nfnetlink_queue", 0440, | |
1298 | net->nf.proc_netfilter, &nfqnl_file_ops)) | |
1299 | return -ENOMEM; | |
1300 | #endif | |
1301 | return 0; | |
1302 | } | |
1303 | ||
1304 | static void __net_exit nfnl_queue_net_exit(struct net *net) | |
1305 | { | |
e778f56e | 1306 | #ifdef CONFIG_PROC_FS |
e8179610 | 1307 | remove_proc_entry("nfnetlink_queue", net->nf.proc_netfilter); |
e778f56e | 1308 | #endif |
e8179610 G |
1309 | } |
1310 | ||
1311 | static struct pernet_operations nfnl_queue_net_ops = { | |
1312 | .init = nfnl_queue_net_init, | |
1313 | .exit = nfnl_queue_net_exit, | |
1314 | .id = &nfnl_queue_net_id, | |
1315 | .size = sizeof(struct nfnl_queue_net), | |
1316 | }; | |
1317 | ||
1318 | static int __init nfnetlink_queue_init(void) | |
1319 | { | |
3bfe0498 FR |
1320 | int status; |
1321 | ||
1322 | status = register_pernet_subsys(&nfnl_queue_net_ops); | |
1323 | if (status < 0) { | |
1324 | pr_err("nf_queue: failed to register pernet ops\n"); | |
1325 | goto out; | |
1326 | } | |
838ab636 | 1327 | |
7af4cc3f HW |
1328 | netlink_register_notifier(&nfqnl_rtnl_notifier); |
1329 | status = nfnetlink_subsys_register(&nfqnl_subsys); | |
1330 | if (status < 0) { | |
e8179610 | 1331 | pr_err("nf_queue: failed to create netlink socket\n"); |
7af4cc3f HW |
1332 | goto cleanup_netlink_notifier; |
1333 | } | |
1334 | ||
1335 | register_netdevice_notifier(&nfqnl_dev_notifier); | |
0360ae41 | 1336 | nf_register_queue_handler(&nfqh); |
7af4cc3f HW |
1337 | return status; |
1338 | ||
7af4cc3f HW |
1339 | cleanup_netlink_notifier: |
1340 | netlink_unregister_notifier(&nfqnl_rtnl_notifier); | |
3bfe0498 | 1341 | out: |
7af4cc3f HW |
1342 | return status; |
1343 | } | |
1344 | ||
65b4b4e8 | 1345 | static void __exit nfnetlink_queue_fini(void) |
7af4cc3f | 1346 | { |
0360ae41 | 1347 | nf_unregister_queue_handler(); |
32292a7f | 1348 | unregister_netdevice_notifier(&nfqnl_dev_notifier); |
32292a7f PM |
1349 | nfnetlink_subsys_unregister(&nfqnl_subsys); |
1350 | netlink_unregister_notifier(&nfqnl_rtnl_notifier); | |
3bfe0498 | 1351 | unregister_pernet_subsys(&nfnl_queue_net_ops); |
67137f3c JDB |
1352 | |
1353 | rcu_barrier(); /* Wait for completion of call_rcu()'s */ | |
7af4cc3f HW |
1354 | } |
1355 | ||
1356 | MODULE_DESCRIPTION("netfilter packet queue handler"); | |
1357 | MODULE_AUTHOR("Harald Welte <laforge@netfilter.org>"); | |
1358 | MODULE_LICENSE("GPL"); | |
1359 | MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_QUEUE); | |
1360 | ||
65b4b4e8 AM |
1361 | module_init(nfnetlink_queue_init); |
1362 | module_exit(nfnetlink_queue_fini); |