Commit | Line | Data |
---|---|---|
7af4cc3f HW |
1 | /* |
2 | * This is a module which is used for queueing packets and communicating with | |
67137f3c | 3 | * userspace via nfnetlink. |
7af4cc3f HW |
4 | * |
5 | * (C) 2005 by Harald Welte <laforge@netfilter.org> | |
4ad9d4fa | 6 | * (C) 2007 by Patrick McHardy <kaber@trash.net> |
7af4cc3f HW |
7 | * |
8 | * Based on the old ipv4-only ip_queue.c: | |
9 | * (C) 2000-2002 James Morris <jmorris@intercode.com.au> | |
10 | * (C) 2003-2005 Netfilter Core Team <coreteam@netfilter.org> | |
11 | * | |
12 | * This program is free software; you can redistribute it and/or modify | |
13 | * it under the terms of the GNU General Public License version 2 as | |
14 | * published by the Free Software Foundation. | |
15 | * | |
16 | */ | |
17 | #include <linux/module.h> | |
18 | #include <linux/skbuff.h> | |
19 | #include <linux/init.h> | |
20 | #include <linux/spinlock.h> | |
5a0e3ad6 | 21 | #include <linux/slab.h> |
7af4cc3f HW |
22 | #include <linux/notifier.h> |
23 | #include <linux/netdevice.h> | |
24 | #include <linux/netfilter.h> | |
838ab636 | 25 | #include <linux/proc_fs.h> |
7af4cc3f HW |
26 | #include <linux/netfilter_ipv4.h> |
27 | #include <linux/netfilter_ipv6.h> | |
28 | #include <linux/netfilter/nfnetlink.h> | |
29 | #include <linux/netfilter/nfnetlink_queue.h> | |
30 | #include <linux/list.h> | |
31 | #include <net/sock.h> | |
83111e7f | 32 | #include <net/tcp_states.h> |
c01cd429 | 33 | #include <net/netfilter/nf_queue.h> |
e8179610 | 34 | #include <net/netns/generic.h> |
7c622345 | 35 | #include <net/netfilter/nfnetlink_queue.h> |
7af4cc3f | 36 | |
60063497 | 37 | #include <linux/atomic.h> |
7af4cc3f | 38 | |
1109a90c | 39 | #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER) |
fbcd923c HW |
40 | #include "../bridge/br_private.h" |
41 | #endif | |
42 | ||
7af4cc3f HW |
43 | #define NFQNL_QMAX_DEFAULT 1024 |
44 | ||
9cefbbc9 FW |
45 | /* We're using struct nlattr which has 16bit nla_len. Note that nla_len |
46 | * includes the header length. Thus, the maximum packet length that we | |
47 | * support is 65531 bytes. We send truncated packets if the specified length | |
48 | * is larger than that. Userspace can check for presence of NFQA_CAP_LEN | |
49 | * attribute to detect truncation. | |
50 | */ | |
51 | #define NFQNL_MAX_COPY_RANGE (0xffff - NLA_HDRLEN) | |
52 | ||
7af4cc3f HW |
53 | struct nfqnl_instance { |
54 | struct hlist_node hlist; /* global list of queues */ | |
9872bec7 | 55 | struct rcu_head rcu; |
7af4cc3f | 56 | |
15e47304 | 57 | int peer_portid; |
7af4cc3f HW |
58 | unsigned int queue_maxlen; |
59 | unsigned int copy_range; | |
7af4cc3f HW |
60 | unsigned int queue_dropped; |
61 | unsigned int queue_user_dropped; | |
62 | ||
7af4cc3f HW |
63 | |
64 | u_int16_t queue_num; /* number of this queue */ | |
65 | u_int8_t copy_mode; | |
fdb694a0 | 66 | u_int32_t flags; /* Set using NFQA_CFG_FLAGS */ |
c463ac97 ED |
67 | /* |
68 | * Following fields are dirtied for each queued packet, | |
69 | * keep them in same cache line if possible. | |
70 | */ | |
71 | spinlock_t lock; | |
72 | unsigned int queue_total; | |
5863702a | 73 | unsigned int id_sequence; /* 'sequence' of pkt ids */ |
7af4cc3f HW |
74 | struct list_head queue_list; /* packets in queue */ |
75 | }; | |
76 | ||
02f014d8 | 77 | typedef int (*nfqnl_cmpfn)(struct nf_queue_entry *, unsigned long); |
7af4cc3f | 78 | |
e8179610 | 79 | static int nfnl_queue_net_id __read_mostly; |
7af4cc3f | 80 | |
7af4cc3f | 81 | #define INSTANCE_BUCKETS 16 |
e8179610 G |
82 | struct nfnl_queue_net { |
83 | spinlock_t instances_lock; | |
84 | struct hlist_head instance_table[INSTANCE_BUCKETS]; | |
85 | }; | |
86 | ||
87 | static struct nfnl_queue_net *nfnl_queue_pernet(struct net *net) | |
88 | { | |
89 | return net_generic(net, nfnl_queue_net_id); | |
90 | } | |
7af4cc3f HW |
91 | |
92 | static inline u_int8_t instance_hashfn(u_int16_t queue_num) | |
93 | { | |
1cdb0905 | 94 | return ((queue_num >> 8) ^ queue_num) % INSTANCE_BUCKETS; |
7af4cc3f HW |
95 | } |
96 | ||
97 | static struct nfqnl_instance * | |
e8179610 | 98 | instance_lookup(struct nfnl_queue_net *q, u_int16_t queue_num) |
7af4cc3f HW |
99 | { |
100 | struct hlist_head *head; | |
7af4cc3f HW |
101 | struct nfqnl_instance *inst; |
102 | ||
e8179610 | 103 | head = &q->instance_table[instance_hashfn(queue_num)]; |
b67bfe0d | 104 | hlist_for_each_entry_rcu(inst, head, hlist) { |
7af4cc3f HW |
105 | if (inst->queue_num == queue_num) |
106 | return inst; | |
107 | } | |
108 | return NULL; | |
109 | } | |
110 | ||
7af4cc3f | 111 | static struct nfqnl_instance * |
e8179610 G |
112 | instance_create(struct nfnl_queue_net *q, u_int16_t queue_num, |
113 | int 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 | ||
260 | if (sk->sk_state == TCP_TIME_WAIT) | |
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 | |
496e4ae7 FW |
317 | if (entry->hook <= NF_INET_FORWARD || |
318 | (entry->hook == NF_INET_POST_ROUTING && entskb->sk == NULL)) | |
319 | csum_verify = !skb_csum_unnecessary(entskb); | |
320 | else | |
321 | csum_verify = false; | |
322 | ||
02f014d8 | 323 | outdev = entry->outdev; |
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); | |
02f014d8 | 371 | nfmsg->nfgen_family = entry->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; | |
378 | pmsg->hook = entry->hook; | |
379 | *packet_id_ptr = &pmsg->packet_id; | |
7af4cc3f | 380 | |
02f014d8 | 381 | indev = entry->indev; |
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 |
02f014d8 | 387 | if (entry->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 HW |
398 | } else { |
399 | /* Case 2: indev is bridge group, we need to look for | |
400 | * physical device (when called from ipv4) */ | |
a447189e DM |
401 | if (nla_put_be32(skb, NFQA_IFINDEX_INDEV, |
402 | htonl(indev->ifindex))) | |
403 | goto nla_put_failure; | |
404 | if (entskb->nf_bridge && entskb->nf_bridge->physindev && | |
405 | nla_put_be32(skb, NFQA_IFINDEX_PHYSINDEV, | |
406 | htonl(entskb->nf_bridge->physindev->ifindex))) | |
407 | goto nla_put_failure; | |
fbcd923c HW |
408 | } |
409 | #endif | |
7af4cc3f HW |
410 | } |
411 | ||
3e4ead4f | 412 | if (outdev) { |
1109a90c | 413 | #if !IS_ENABLED(CONFIG_BRIDGE_NETFILTER) |
a447189e DM |
414 | if (nla_put_be32(skb, NFQA_IFINDEX_OUTDEV, htonl(outdev->ifindex))) |
415 | goto nla_put_failure; | |
fbcd923c | 416 | #else |
02f014d8 | 417 | if (entry->pf == PF_BRIDGE) { |
fbcd923c | 418 | /* Case 1: outdev is physical output device, we need to |
601e68e1 | 419 | * look for bridge group (when called from |
fbcd923c | 420 | * netfilter_bridge) */ |
a447189e DM |
421 | if (nla_put_be32(skb, NFQA_IFINDEX_PHYSOUTDEV, |
422 | htonl(outdev->ifindex)) || | |
fbcd923c | 423 | /* this is the bridge group "brX" */ |
f350a0a8 | 424 | /* rcu_read_lock()ed by __nf_queue */ |
a447189e DM |
425 | nla_put_be32(skb, NFQA_IFINDEX_OUTDEV, |
426 | htonl(br_port_get_rcu(outdev)->br->dev->ifindex))) | |
427 | goto nla_put_failure; | |
fbcd923c HW |
428 | } else { |
429 | /* Case 2: outdev is bridge group, we need to look for | |
430 | * physical output device (when called from ipv4) */ | |
a447189e DM |
431 | if (nla_put_be32(skb, NFQA_IFINDEX_OUTDEV, |
432 | htonl(outdev->ifindex))) | |
433 | goto nla_put_failure; | |
434 | if (entskb->nf_bridge && entskb->nf_bridge->physoutdev && | |
435 | nla_put_be32(skb, NFQA_IFINDEX_PHYSOUTDEV, | |
436 | htonl(entskb->nf_bridge->physoutdev->ifindex))) | |
437 | goto nla_put_failure; | |
fbcd923c HW |
438 | } |
439 | #endif | |
7af4cc3f HW |
440 | } |
441 | ||
a447189e DM |
442 | if (entskb->mark && |
443 | nla_put_be32(skb, NFQA_MARK, htonl(entskb->mark))) | |
444 | goto nla_put_failure; | |
7af4cc3f | 445 | |
2c38de4c NC |
446 | if (indev && entskb->dev && |
447 | entskb->mac_header != entskb->network_header) { | |
7af4cc3f | 448 | struct nfqnl_msg_packet_hw phw; |
e4d091d7 DC |
449 | int len; |
450 | ||
451 | memset(&phw, 0, sizeof(phw)); | |
452 | len = dev_parse_header(entskb, phw.hw_addr); | |
b95cce35 SH |
453 | if (len) { |
454 | phw.hw_addrlen = htons(len); | |
a447189e DM |
455 | if (nla_put(skb, NFQA_HWADDR, sizeof(phw), &phw)) |
456 | goto nla_put_failure; | |
b95cce35 | 457 | } |
7af4cc3f HW |
458 | } |
459 | ||
b7aa0bf7 | 460 | if (entskb->tstamp.tv64) { |
7af4cc3f | 461 | struct nfqnl_msg_packet_timestamp ts; |
b7aa0bf7 ED |
462 | struct timeval tv = ktime_to_timeval(entskb->tstamp); |
463 | ts.sec = cpu_to_be64(tv.tv_sec); | |
464 | ts.usec = cpu_to_be64(tv.tv_usec); | |
7af4cc3f | 465 | |
a447189e DM |
466 | if (nla_put(skb, NFQA_TIMESTAMP, sizeof(ts), &ts)) |
467 | goto nla_put_failure; | |
7af4cc3f HW |
468 | } |
469 | ||
08c0cad6 VG |
470 | if ((queue->flags & NFQA_CFG_F_UID_GID) && entskb->sk && |
471 | nfqnl_put_sk_uidgid(skb, entskb->sk) < 0) | |
472 | goto nla_put_failure; | |
473 | ||
ae08ce00 ED |
474 | if (ct && nfqnl_ct_put(skb, ct, ctinfo) < 0) |
475 | goto nla_put_failure; | |
476 | ||
7f87712c FW |
477 | if (cap_len > data_len && |
478 | nla_put_be32(skb, NFQA_CAP_LEN, htonl(cap_len))) | |
ae08ce00 ED |
479 | goto nla_put_failure; |
480 | ||
496e4ae7 | 481 | if (nfqnl_put_packet_info(skb, entskb, csum_verify)) |
7237190d FW |
482 | goto nla_put_failure; |
483 | ||
7af4cc3f | 484 | if (data_len) { |
df6fb868 | 485 | struct nlattr *nla; |
7af4cc3f | 486 | |
ae08ce00 ED |
487 | if (skb_tailroom(skb) < sizeof(*nla) + hlen) |
488 | goto nla_put_failure; | |
7af4cc3f | 489 | |
ae08ce00 | 490 | nla = (struct nlattr *)skb_put(skb, sizeof(*nla)); |
df6fb868 | 491 | nla->nla_type = NFQA_PAYLOAD; |
ae08ce00 | 492 | nla->nla_len = nla_attr_size(data_len); |
7af4cc3f | 493 | |
36d5fe6a ZK |
494 | if (skb_zerocopy(skb, entskb, data_len, hlen)) |
495 | goto nla_put_failure; | |
7af4cc3f | 496 | } |
601e68e1 | 497 | |
ae08ce00 | 498 | nlh->nlmsg_len = skb->len; |
7af4cc3f HW |
499 | return skb; |
500 | ||
df6fb868 | 501 | nla_put_failure: |
36d5fe6a | 502 | skb_tx_error(entskb); |
a6729955 | 503 | kfree_skb(skb); |
e87cc472 | 504 | net_err_ratelimited("nf_queue: error creating packet message\n"); |
7af4cc3f HW |
505 | return NULL; |
506 | } | |
507 | ||
508 | static int | |
a5fedd43 FW |
509 | __nfqnl_enqueue_packet(struct net *net, struct nfqnl_instance *queue, |
510 | struct nf_queue_entry *entry) | |
7af4cc3f | 511 | { |
7af4cc3f | 512 | struct sk_buff *nskb; |
f1585086 | 513 | int err = -ENOBUFS; |
5863702a | 514 | __be32 *packet_id_ptr; |
fdb694a0 | 515 | int failopen = 0; |
7af4cc3f | 516 | |
74332687 | 517 | nskb = nfqnl_build_packet_message(net, queue, entry, &packet_id_ptr); |
f1585086 FW |
518 | if (nskb == NULL) { |
519 | err = -ENOMEM; | |
0ef0f465 | 520 | goto err_out; |
f1585086 | 521 | } |
7af4cc3f | 522 | spin_lock_bh(&queue->lock); |
601e68e1 | 523 | |
7af4cc3f | 524 | if (queue->queue_total >= queue->queue_maxlen) { |
fdb694a0 KK |
525 | if (queue->flags & NFQA_CFG_F_FAIL_OPEN) { |
526 | failopen = 1; | |
527 | err = 0; | |
528 | } else { | |
529 | queue->queue_dropped++; | |
530 | net_warn_ratelimited("nf_queue: full at %d entries, dropping packets(s)\n", | |
531 | queue->queue_total); | |
532 | } | |
7af4cc3f HW |
533 | goto err_out_free_nskb; |
534 | } | |
5863702a ED |
535 | entry->id = ++queue->id_sequence; |
536 | *packet_id_ptr = htonl(entry->id); | |
7af4cc3f HW |
537 | |
538 | /* nfnetlink_unicast will either free the nskb or add it to a socket */ | |
e8179610 | 539 | err = nfnetlink_unicast(nskb, net, queue->peer_portid, MSG_DONTWAIT); |
0ef0f465 | 540 | if (err < 0) { |
601e68e1 | 541 | queue->queue_user_dropped++; |
7af4cc3f HW |
542 | goto err_out_unlock; |
543 | } | |
544 | ||
545 | __enqueue_entry(queue, entry); | |
546 | ||
547 | spin_unlock_bh(&queue->lock); | |
0ef0f465 | 548 | return 0; |
7af4cc3f HW |
549 | |
550 | err_out_free_nskb: | |
601e68e1 | 551 | kfree_skb(nskb); |
7af4cc3f HW |
552 | err_out_unlock: |
553 | spin_unlock_bh(&queue->lock); | |
fdb694a0 KK |
554 | if (failopen) |
555 | nf_reinject(entry, NF_ACCEPT); | |
0ef0f465 | 556 | err_out: |
f1585086 | 557 | return err; |
7af4cc3f HW |
558 | } |
559 | ||
a5fedd43 FW |
560 | static struct nf_queue_entry * |
561 | nf_queue_entry_dup(struct nf_queue_entry *e) | |
562 | { | |
563 | struct nf_queue_entry *entry = kmemdup(e, e->size, GFP_ATOMIC); | |
564 | if (entry) { | |
565 | if (nf_queue_entry_get_refs(entry)) | |
566 | return entry; | |
567 | kfree(entry); | |
568 | } | |
569 | return NULL; | |
570 | } | |
571 | ||
1109a90c | 572 | #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER) |
a5fedd43 FW |
573 | /* When called from bridge netfilter, skb->data must point to MAC header |
574 | * before calling skb_gso_segment(). Else, original MAC header is lost | |
575 | * and segmented skbs will be sent to wrong destination. | |
576 | */ | |
577 | static void nf_bridge_adjust_skb_data(struct sk_buff *skb) | |
578 | { | |
579 | if (skb->nf_bridge) | |
580 | __skb_push(skb, skb->network_header - skb->mac_header); | |
581 | } | |
582 | ||
583 | static void nf_bridge_adjust_segmented_data(struct sk_buff *skb) | |
584 | { | |
585 | if (skb->nf_bridge) | |
586 | __skb_pull(skb, skb->network_header - skb->mac_header); | |
587 | } | |
588 | #else | |
589 | #define nf_bridge_adjust_skb_data(s) do {} while (0) | |
590 | #define nf_bridge_adjust_segmented_data(s) do {} while (0) | |
591 | #endif | |
592 | ||
593 | static void free_entry(struct nf_queue_entry *entry) | |
594 | { | |
595 | nf_queue_entry_release_refs(entry); | |
596 | kfree(entry); | |
597 | } | |
598 | ||
599 | static int | |
600 | __nfqnl_enqueue_packet_gso(struct net *net, struct nfqnl_instance *queue, | |
601 | struct sk_buff *skb, struct nf_queue_entry *entry) | |
602 | { | |
603 | int ret = -ENOMEM; | |
604 | struct nf_queue_entry *entry_seg; | |
605 | ||
606 | nf_bridge_adjust_segmented_data(skb); | |
607 | ||
608 | if (skb->next == NULL) { /* last packet, no need to copy entry */ | |
609 | struct sk_buff *gso_skb = entry->skb; | |
610 | entry->skb = skb; | |
611 | ret = __nfqnl_enqueue_packet(net, queue, entry); | |
612 | if (ret) | |
613 | entry->skb = gso_skb; | |
614 | return ret; | |
615 | } | |
616 | ||
617 | skb->next = NULL; | |
618 | ||
619 | entry_seg = nf_queue_entry_dup(entry); | |
620 | if (entry_seg) { | |
621 | entry_seg->skb = skb; | |
622 | ret = __nfqnl_enqueue_packet(net, queue, entry_seg); | |
623 | if (ret) | |
624 | free_entry(entry_seg); | |
625 | } | |
626 | return ret; | |
627 | } | |
628 | ||
629 | static int | |
630 | nfqnl_enqueue_packet(struct nf_queue_entry *entry, unsigned int queuenum) | |
631 | { | |
632 | unsigned int queued; | |
633 | struct nfqnl_instance *queue; | |
634 | struct sk_buff *skb, *segs; | |
635 | int err = -ENOBUFS; | |
636 | struct net *net = dev_net(entry->indev ? | |
637 | entry->indev : entry->outdev); | |
638 | struct nfnl_queue_net *q = nfnl_queue_pernet(net); | |
639 | ||
640 | /* rcu_read_lock()ed by nf_hook_slow() */ | |
641 | queue = instance_lookup(q, queuenum); | |
642 | if (!queue) | |
643 | return -ESRCH; | |
644 | ||
645 | if (queue->copy_mode == NFQNL_COPY_NONE) | |
646 | return -EINVAL; | |
647 | ||
a5fedd43 FW |
648 | skb = entry->skb; |
649 | ||
650 | switch (entry->pf) { | |
651 | case NFPROTO_IPV4: | |
652 | skb->protocol = htons(ETH_P_IP); | |
653 | break; | |
654 | case NFPROTO_IPV6: | |
655 | skb->protocol = htons(ETH_P_IPV6); | |
656 | break; | |
657 | } | |
658 | ||
7b8dfe28 PNA |
659 | if ((queue->flags & NFQA_CFG_F_GSO) || !skb_is_gso(skb)) |
660 | return __nfqnl_enqueue_packet(net, queue, entry); | |
661 | ||
a5fedd43 FW |
662 | nf_bridge_adjust_skb_data(skb); |
663 | segs = skb_gso_segment(skb, 0); | |
664 | /* Does not use PTR_ERR to limit the number of error codes that can be | |
665 | * returned by nf_queue. For instance, callers rely on -ECANCELED to | |
666 | * mean 'ignore this hook'. | |
667 | */ | |
330966e5 | 668 | if (IS_ERR_OR_NULL(segs)) |
a5fedd43 FW |
669 | goto out_err; |
670 | queued = 0; | |
671 | err = 0; | |
672 | do { | |
673 | struct sk_buff *nskb = segs->next; | |
674 | if (err == 0) | |
675 | err = __nfqnl_enqueue_packet_gso(net, queue, | |
676 | segs, entry); | |
677 | if (err == 0) | |
678 | queued++; | |
679 | else | |
680 | kfree_skb(segs); | |
681 | segs = nskb; | |
682 | } while (segs); | |
683 | ||
684 | if (queued) { | |
685 | if (err) /* some segments are already queued */ | |
686 | free_entry(entry); | |
687 | kfree_skb(skb); | |
688 | return 0; | |
689 | } | |
690 | out_err: | |
691 | nf_bridge_adjust_segmented_data(skb); | |
692 | return err; | |
693 | } | |
694 | ||
7af4cc3f | 695 | static int |
8c88f87c | 696 | nfqnl_mangle(void *data, int data_len, struct nf_queue_entry *e, int diff) |
7af4cc3f | 697 | { |
e2b58a67 | 698 | struct sk_buff *nskb; |
7af4cc3f | 699 | |
d8a585d7 PM |
700 | if (diff < 0) { |
701 | if (pskb_trim(e->skb, data_len)) | |
702 | return -ENOMEM; | |
703 | } else if (diff > 0) { | |
7af4cc3f HW |
704 | if (data_len > 0xFFFF) |
705 | return -EINVAL; | |
706 | if (diff > skb_tailroom(e->skb)) { | |
9a732ed6 AE |
707 | nskb = skb_copy_expand(e->skb, skb_headroom(e->skb), |
708 | diff, GFP_ATOMIC); | |
e2b58a67 | 709 | if (!nskb) { |
1158ba27 | 710 | printk(KERN_WARNING "nf_queue: OOM " |
7af4cc3f | 711 | "in mangle, dropping packet\n"); |
e2b58a67 | 712 | return -ENOMEM; |
7af4cc3f | 713 | } |
e2b58a67 PM |
714 | kfree_skb(e->skb); |
715 | e->skb = nskb; | |
7af4cc3f HW |
716 | } |
717 | skb_put(e->skb, diff); | |
718 | } | |
37d41879 | 719 | if (!skb_make_writable(e->skb, data_len)) |
7af4cc3f | 720 | return -ENOMEM; |
27d7ff46 | 721 | skb_copy_to_linear_data(e->skb, data, data_len); |
e7dfb09a | 722 | e->skb->ip_summed = CHECKSUM_NONE; |
7af4cc3f HW |
723 | return 0; |
724 | } | |
725 | ||
7af4cc3f HW |
726 | static int |
727 | nfqnl_set_mode(struct nfqnl_instance *queue, | |
728 | unsigned char mode, unsigned int range) | |
729 | { | |
c5de0dfd | 730 | int status = 0; |
7af4cc3f HW |
731 | |
732 | spin_lock_bh(&queue->lock); | |
c5de0dfd PM |
733 | switch (mode) { |
734 | case NFQNL_COPY_NONE: | |
735 | case NFQNL_COPY_META: | |
736 | queue->copy_mode = mode; | |
737 | queue->copy_range = 0; | |
738 | break; | |
739 | ||
740 | case NFQNL_COPY_PACKET: | |
741 | queue->copy_mode = mode; | |
9cefbbc9 FW |
742 | if (range == 0 || range > NFQNL_MAX_COPY_RANGE) |
743 | queue->copy_range = NFQNL_MAX_COPY_RANGE; | |
c5de0dfd PM |
744 | else |
745 | queue->copy_range = range; | |
746 | break; | |
747 | ||
748 | default: | |
749 | status = -EINVAL; | |
750 | ||
751 | } | |
7af4cc3f HW |
752 | spin_unlock_bh(&queue->lock); |
753 | ||
754 | return status; | |
755 | } | |
756 | ||
757 | static int | |
02f014d8 | 758 | dev_cmp(struct nf_queue_entry *entry, unsigned long ifindex) |
7af4cc3f | 759 | { |
02f014d8 PM |
760 | if (entry->indev) |
761 | if (entry->indev->ifindex == ifindex) | |
7af4cc3f | 762 | return 1; |
02f014d8 PM |
763 | if (entry->outdev) |
764 | if (entry->outdev->ifindex == ifindex) | |
7af4cc3f | 765 | return 1; |
1109a90c | 766 | #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER) |
ef47c6a7 PM |
767 | if (entry->skb->nf_bridge) { |
768 | if (entry->skb->nf_bridge->physindev && | |
769 | entry->skb->nf_bridge->physindev->ifindex == ifindex) | |
770 | return 1; | |
771 | if (entry->skb->nf_bridge->physoutdev && | |
772 | entry->skb->nf_bridge->physoutdev->ifindex == ifindex) | |
773 | return 1; | |
774 | } | |
775 | #endif | |
7af4cc3f HW |
776 | return 0; |
777 | } | |
778 | ||
779 | /* drop all packets with either indev or outdev == ifindex from all queue | |
780 | * instances */ | |
781 | static void | |
e8179610 | 782 | nfqnl_dev_drop(struct net *net, int ifindex) |
7af4cc3f HW |
783 | { |
784 | int i; | |
e8179610 | 785 | struct nfnl_queue_net *q = nfnl_queue_pernet(net); |
601e68e1 | 786 | |
9872bec7 | 787 | rcu_read_lock(); |
7af4cc3f | 788 | |
9872bec7 | 789 | for (i = 0; i < INSTANCE_BUCKETS; i++) { |
7af4cc3f | 790 | struct nfqnl_instance *inst; |
e8179610 | 791 | struct hlist_head *head = &q->instance_table[i]; |
7af4cc3f | 792 | |
b67bfe0d | 793 | hlist_for_each_entry_rcu(inst, head, hlist) |
b43d8d85 | 794 | nfqnl_flush(inst, dev_cmp, ifindex); |
7af4cc3f HW |
795 | } |
796 | ||
9872bec7 | 797 | rcu_read_unlock(); |
7af4cc3f HW |
798 | } |
799 | ||
800 | #define RCV_SKB_FAIL(err) do { netlink_ack(skb, nlh, (err)); return; } while (0) | |
801 | ||
802 | static int | |
803 | nfqnl_rcv_dev_event(struct notifier_block *this, | |
804 | unsigned long event, void *ptr) | |
805 | { | |
351638e7 | 806 | struct net_device *dev = netdev_notifier_info_to_dev(ptr); |
7af4cc3f HW |
807 | |
808 | /* Drop any packets associated with the downed device */ | |
809 | if (event == NETDEV_DOWN) | |
e8179610 | 810 | nfqnl_dev_drop(dev_net(dev), dev->ifindex); |
7af4cc3f HW |
811 | return NOTIFY_DONE; |
812 | } | |
813 | ||
814 | static struct notifier_block nfqnl_dev_notifier = { | |
815 | .notifier_call = nfqnl_rcv_dev_event, | |
816 | }; | |
817 | ||
818 | static int | |
819 | nfqnl_rcv_nl_event(struct notifier_block *this, | |
820 | unsigned long event, void *ptr) | |
821 | { | |
822 | struct netlink_notify *n = ptr; | |
e8179610 | 823 | struct nfnl_queue_net *q = nfnl_queue_pernet(n->net); |
7af4cc3f | 824 | |
dee5817e | 825 | if (event == NETLINK_URELEASE && n->protocol == NETLINK_NETFILTER) { |
7af4cc3f HW |
826 | int i; |
827 | ||
15e47304 | 828 | /* destroy all instances for this portid */ |
e8179610 | 829 | spin_lock(&q->instances_lock); |
9872bec7 | 830 | for (i = 0; i < INSTANCE_BUCKETS; i++) { |
b67bfe0d | 831 | struct hlist_node *t2; |
7af4cc3f | 832 | struct nfqnl_instance *inst; |
e8179610 | 833 | struct hlist_head *head = &q->instance_table[i]; |
7af4cc3f | 834 | |
b67bfe0d | 835 | hlist_for_each_entry_safe(inst, t2, head, hlist) { |
e8179610 | 836 | if (n->portid == inst->peer_portid) |
7af4cc3f HW |
837 | __instance_destroy(inst); |
838 | } | |
839 | } | |
e8179610 | 840 | spin_unlock(&q->instances_lock); |
7af4cc3f HW |
841 | } |
842 | return NOTIFY_DONE; | |
843 | } | |
844 | ||
845 | static struct notifier_block nfqnl_rtnl_notifier = { | |
846 | .notifier_call = nfqnl_rcv_nl_event, | |
847 | }; | |
848 | ||
5bf75853 PM |
849 | static const struct nla_policy nfqa_verdict_policy[NFQA_MAX+1] = { |
850 | [NFQA_VERDICT_HDR] = { .len = sizeof(struct nfqnl_msg_verdict_hdr) }, | |
851 | [NFQA_MARK] = { .type = NLA_U32 }, | |
852 | [NFQA_PAYLOAD] = { .type = NLA_UNSPEC }, | |
9cb01766 | 853 | [NFQA_CT] = { .type = NLA_UNSPEC }, |
bd077937 | 854 | [NFQA_EXP] = { .type = NLA_UNSPEC }, |
838ab636 HW |
855 | }; |
856 | ||
97d32cf9 FW |
857 | static const struct nla_policy nfqa_verdict_batch_policy[NFQA_MAX+1] = { |
858 | [NFQA_VERDICT_HDR] = { .len = sizeof(struct nfqnl_msg_verdict_hdr) }, | |
859 | [NFQA_MARK] = { .type = NLA_U32 }, | |
860 | }; | |
861 | ||
e8179610 G |
862 | static struct nfqnl_instance * |
863 | verdict_instance_lookup(struct nfnl_queue_net *q, u16 queue_num, int nlportid) | |
97d32cf9 FW |
864 | { |
865 | struct nfqnl_instance *queue; | |
866 | ||
e8179610 | 867 | queue = instance_lookup(q, queue_num); |
97d32cf9 FW |
868 | if (!queue) |
869 | return ERR_PTR(-ENODEV); | |
870 | ||
15e47304 | 871 | if (queue->peer_portid != nlportid) |
97d32cf9 FW |
872 | return ERR_PTR(-EPERM); |
873 | ||
874 | return queue; | |
875 | } | |
876 | ||
877 | static struct nfqnl_msg_verdict_hdr* | |
878 | verdicthdr_get(const struct nlattr * const nfqa[]) | |
879 | { | |
880 | struct nfqnl_msg_verdict_hdr *vhdr; | |
881 | unsigned int verdict; | |
882 | ||
883 | if (!nfqa[NFQA_VERDICT_HDR]) | |
884 | return NULL; | |
885 | ||
886 | vhdr = nla_data(nfqa[NFQA_VERDICT_HDR]); | |
c6675233 FW |
887 | verdict = ntohl(vhdr->verdict) & NF_VERDICT_MASK; |
888 | if (verdict > NF_MAX_VERDICT || verdict == NF_STOLEN) | |
97d32cf9 FW |
889 | return NULL; |
890 | return vhdr; | |
891 | } | |
892 | ||
893 | static int nfq_id_after(unsigned int id, unsigned int max) | |
894 | { | |
895 | return (int)(id - max) > 0; | |
896 | } | |
897 | ||
898 | static int | |
899 | nfqnl_recv_verdict_batch(struct sock *ctnl, struct sk_buff *skb, | |
900 | const struct nlmsghdr *nlh, | |
901 | const struct nlattr * const nfqa[]) | |
902 | { | |
3da07c0c | 903 | struct nfgenmsg *nfmsg = nlmsg_data(nlh); |
97d32cf9 FW |
904 | struct nf_queue_entry *entry, *tmp; |
905 | unsigned int verdict, maxid; | |
906 | struct nfqnl_msg_verdict_hdr *vhdr; | |
907 | struct nfqnl_instance *queue; | |
908 | LIST_HEAD(batch_list); | |
909 | u16 queue_num = ntohs(nfmsg->res_id); | |
910 | ||
e8179610 G |
911 | struct net *net = sock_net(ctnl); |
912 | struct nfnl_queue_net *q = nfnl_queue_pernet(net); | |
913 | ||
914 | queue = verdict_instance_lookup(q, queue_num, | |
915 | NETLINK_CB(skb).portid); | |
97d32cf9 FW |
916 | if (IS_ERR(queue)) |
917 | return PTR_ERR(queue); | |
918 | ||
919 | vhdr = verdicthdr_get(nfqa); | |
920 | if (!vhdr) | |
921 | return -EINVAL; | |
922 | ||
923 | verdict = ntohl(vhdr->verdict); | |
924 | maxid = ntohl(vhdr->id); | |
925 | ||
926 | spin_lock_bh(&queue->lock); | |
927 | ||
928 | list_for_each_entry_safe(entry, tmp, &queue->queue_list, list) { | |
929 | if (nfq_id_after(entry->id, maxid)) | |
930 | break; | |
931 | __dequeue_entry(queue, entry); | |
932 | list_add_tail(&entry->list, &batch_list); | |
933 | } | |
934 | ||
935 | spin_unlock_bh(&queue->lock); | |
936 | ||
937 | if (list_empty(&batch_list)) | |
938 | return -ENOENT; | |
939 | ||
940 | list_for_each_entry_safe(entry, tmp, &batch_list, list) { | |
941 | if (nfqa[NFQA_MARK]) | |
942 | entry->skb->mark = ntohl(nla_get_be32(nfqa[NFQA_MARK])); | |
943 | nf_reinject(entry, verdict); | |
944 | } | |
945 | return 0; | |
946 | } | |
947 | ||
7af4cc3f HW |
948 | static int |
949 | nfqnl_recv_verdict(struct sock *ctnl, struct sk_buff *skb, | |
39938324 PM |
950 | const struct nlmsghdr *nlh, |
951 | const struct nlattr * const nfqa[]) | |
7af4cc3f | 952 | { |
3da07c0c | 953 | struct nfgenmsg *nfmsg = nlmsg_data(nlh); |
7af4cc3f HW |
954 | u_int16_t queue_num = ntohs(nfmsg->res_id); |
955 | ||
956 | struct nfqnl_msg_verdict_hdr *vhdr; | |
957 | struct nfqnl_instance *queue; | |
958 | unsigned int verdict; | |
02f014d8 | 959 | struct nf_queue_entry *entry; |
8c88f87c PNA |
960 | enum ip_conntrack_info uninitialized_var(ctinfo); |
961 | struct nf_conn *ct = NULL; | |
7af4cc3f | 962 | |
e8179610 G |
963 | struct net *net = sock_net(ctnl); |
964 | struct nfnl_queue_net *q = nfnl_queue_pernet(net); | |
7af4cc3f | 965 | |
e8179610 G |
966 | queue = instance_lookup(q, queue_num); |
967 | if (!queue) | |
968 | queue = verdict_instance_lookup(q, queue_num, | |
969 | NETLINK_CB(skb).portid); | |
97d32cf9 FW |
970 | if (IS_ERR(queue)) |
971 | return PTR_ERR(queue); | |
7af4cc3f | 972 | |
97d32cf9 FW |
973 | vhdr = verdicthdr_get(nfqa); |
974 | if (!vhdr) | |
84a797dd | 975 | return -EINVAL; |
7af4cc3f | 976 | |
7af4cc3f HW |
977 | verdict = ntohl(vhdr->verdict); |
978 | ||
b43d8d85 | 979 | entry = find_dequeue_entry(queue, ntohl(vhdr->id)); |
84a797dd ED |
980 | if (entry == NULL) |
981 | return -ENOENT; | |
7af4cc3f | 982 | |
bd077937 | 983 | if (nfqa[NFQA_CT]) { |
7c622345 | 984 | ct = nfqnl_ct_parse(entry->skb, nfqa[NFQA_CT], &ctinfo); |
bd077937 PNA |
985 | if (ct && nfqa[NFQA_EXP]) { |
986 | nfqnl_attach_expect(ct, nfqa[NFQA_EXP], | |
987 | NETLINK_CB(skb).portid, | |
988 | nlmsg_report(nlh)); | |
989 | } | |
990 | } | |
9cb01766 | 991 | |
df6fb868 | 992 | if (nfqa[NFQA_PAYLOAD]) { |
8c88f87c PNA |
993 | u16 payload_len = nla_len(nfqa[NFQA_PAYLOAD]); |
994 | int diff = payload_len - entry->skb->len; | |
995 | ||
df6fb868 | 996 | if (nfqnl_mangle(nla_data(nfqa[NFQA_PAYLOAD]), |
8c88f87c | 997 | payload_len, entry, diff) < 0) |
7af4cc3f | 998 | verdict = NF_DROP; |
8c88f87c | 999 | |
7c622345 | 1000 | if (ct) |
0a0d80eb | 1001 | nfqnl_ct_seq_adjust(entry->skb, ct, ctinfo, diff); |
7af4cc3f HW |
1002 | } |
1003 | ||
df6fb868 | 1004 | if (nfqa[NFQA_MARK]) |
ea3a66ff | 1005 | entry->skb->mark = ntohl(nla_get_be32(nfqa[NFQA_MARK])); |
601e68e1 | 1006 | |
4b3d15ef | 1007 | nf_reinject(entry, verdict); |
7af4cc3f HW |
1008 | return 0; |
1009 | } | |
1010 | ||
1011 | static int | |
1012 | nfqnl_recv_unsupp(struct sock *ctnl, struct sk_buff *skb, | |
39938324 PM |
1013 | const struct nlmsghdr *nlh, |
1014 | const struct nlattr * const nfqa[]) | |
7af4cc3f HW |
1015 | { |
1016 | return -ENOTSUPP; | |
1017 | } | |
1018 | ||
5bf75853 PM |
1019 | static const struct nla_policy nfqa_cfg_policy[NFQA_CFG_MAX+1] = { |
1020 | [NFQA_CFG_CMD] = { .len = sizeof(struct nfqnl_msg_config_cmd) }, | |
1021 | [NFQA_CFG_PARAMS] = { .len = sizeof(struct nfqnl_msg_config_params) }, | |
838ab636 HW |
1022 | }; |
1023 | ||
e3ac5298 | 1024 | static const struct nf_queue_handler nfqh = { |
bbd86b9f HW |
1025 | .outfn = &nfqnl_enqueue_packet, |
1026 | }; | |
1027 | ||
7af4cc3f HW |
1028 | static int |
1029 | nfqnl_recv_config(struct sock *ctnl, struct sk_buff *skb, | |
39938324 PM |
1030 | const struct nlmsghdr *nlh, |
1031 | const struct nlattr * const nfqa[]) | |
7af4cc3f | 1032 | { |
3da07c0c | 1033 | struct nfgenmsg *nfmsg = nlmsg_data(nlh); |
7af4cc3f HW |
1034 | u_int16_t queue_num = ntohs(nfmsg->res_id); |
1035 | struct nfqnl_instance *queue; | |
9872bec7 | 1036 | struct nfqnl_msg_config_cmd *cmd = NULL; |
e8179610 G |
1037 | struct net *net = sock_net(ctnl); |
1038 | struct nfnl_queue_net *q = nfnl_queue_pernet(net); | |
838ab636 | 1039 | int ret = 0; |
7af4cc3f | 1040 | |
9872bec7 PM |
1041 | if (nfqa[NFQA_CFG_CMD]) { |
1042 | cmd = nla_data(nfqa[NFQA_CFG_CMD]); | |
1043 | ||
0360ae41 | 1044 | /* Obsolete commands without queue context */ |
9872bec7 | 1045 | switch (cmd->command) { |
0360ae41 FW |
1046 | case NFQNL_CFG_CMD_PF_BIND: return 0; |
1047 | case NFQNL_CFG_CMD_PF_UNBIND: return 0; | |
9872bec7 | 1048 | } |
9872bec7 PM |
1049 | } |
1050 | ||
1051 | rcu_read_lock(); | |
e8179610 | 1052 | queue = instance_lookup(q, queue_num); |
15e47304 | 1053 | if (queue && queue->peer_portid != NETLINK_CB(skb).portid) { |
a3c8e7fd | 1054 | ret = -EPERM; |
9872bec7 | 1055 | goto err_out_unlock; |
a3c8e7fd PM |
1056 | } |
1057 | ||
9872bec7 | 1058 | if (cmd != NULL) { |
7af4cc3f HW |
1059 | switch (cmd->command) { |
1060 | case NFQNL_CFG_CMD_BIND: | |
9872bec7 PM |
1061 | if (queue) { |
1062 | ret = -EBUSY; | |
1063 | goto err_out_unlock; | |
1064 | } | |
e8179610 G |
1065 | queue = instance_create(q, queue_num, |
1066 | NETLINK_CB(skb).portid); | |
baab2ce7 PM |
1067 | if (IS_ERR(queue)) { |
1068 | ret = PTR_ERR(queue); | |
9872bec7 PM |
1069 | goto err_out_unlock; |
1070 | } | |
7af4cc3f HW |
1071 | break; |
1072 | case NFQNL_CFG_CMD_UNBIND: | |
9872bec7 PM |
1073 | if (!queue) { |
1074 | ret = -ENODEV; | |
1075 | goto err_out_unlock; | |
1076 | } | |
e8179610 | 1077 | instance_destroy(q, queue); |
7af4cc3f HW |
1078 | break; |
1079 | case NFQNL_CFG_CMD_PF_BIND: | |
7af4cc3f | 1080 | case NFQNL_CFG_CMD_PF_UNBIND: |
7af4cc3f HW |
1081 | break; |
1082 | default: | |
cd21f0ac | 1083 | ret = -ENOTSUPP; |
838ab636 | 1084 | break; |
7af4cc3f | 1085 | } |
7af4cc3f HW |
1086 | } |
1087 | ||
df6fb868 | 1088 | if (nfqa[NFQA_CFG_PARAMS]) { |
7af4cc3f | 1089 | struct nfqnl_msg_config_params *params; |
7af4cc3f | 1090 | |
406dbfc9 | 1091 | if (!queue) { |
a3c8e7fd | 1092 | ret = -ENODEV; |
9872bec7 | 1093 | goto err_out_unlock; |
406dbfc9 | 1094 | } |
df6fb868 | 1095 | params = nla_data(nfqa[NFQA_CFG_PARAMS]); |
7af4cc3f HW |
1096 | nfqnl_set_mode(queue, params->copy_mode, |
1097 | ntohl(params->copy_range)); | |
1098 | } | |
1099 | ||
df6fb868 | 1100 | if (nfqa[NFQA_CFG_QUEUE_MAXLEN]) { |
829e17a1 | 1101 | __be32 *queue_maxlen; |
a3c8e7fd PM |
1102 | |
1103 | if (!queue) { | |
1104 | ret = -ENODEV; | |
9872bec7 | 1105 | goto err_out_unlock; |
a3c8e7fd | 1106 | } |
df6fb868 | 1107 | queue_maxlen = nla_data(nfqa[NFQA_CFG_QUEUE_MAXLEN]); |
829e17a1 EL |
1108 | spin_lock_bh(&queue->lock); |
1109 | queue->queue_maxlen = ntohl(*queue_maxlen); | |
1110 | spin_unlock_bh(&queue->lock); | |
1111 | } | |
1112 | ||
fdb694a0 KK |
1113 | if (nfqa[NFQA_CFG_FLAGS]) { |
1114 | __u32 flags, mask; | |
1115 | ||
1116 | if (!queue) { | |
1117 | ret = -ENODEV; | |
1118 | goto err_out_unlock; | |
1119 | } | |
1120 | ||
1121 | if (!nfqa[NFQA_CFG_MASK]) { | |
1122 | /* A mask is needed to specify which flags are being | |
1123 | * changed. | |
1124 | */ | |
1125 | ret = -EINVAL; | |
1126 | goto err_out_unlock; | |
1127 | } | |
1128 | ||
1129 | flags = ntohl(nla_get_be32(nfqa[NFQA_CFG_FLAGS])); | |
1130 | mask = ntohl(nla_get_be32(nfqa[NFQA_CFG_MASK])); | |
1131 | ||
46ba5a25 KK |
1132 | if (flags >= NFQA_CFG_F_MAX) { |
1133 | ret = -EOPNOTSUPP; | |
1134 | goto err_out_unlock; | |
1135 | } | |
1136 | ||
fdb694a0 KK |
1137 | spin_lock_bh(&queue->lock); |
1138 | queue->flags &= ~mask; | |
1139 | queue->flags |= flags & mask; | |
1140 | spin_unlock_bh(&queue->lock); | |
1141 | } | |
1142 | ||
9872bec7 PM |
1143 | err_out_unlock: |
1144 | rcu_read_unlock(); | |
838ab636 | 1145 | return ret; |
7af4cc3f HW |
1146 | } |
1147 | ||
7c8d4cb4 | 1148 | static const struct nfnl_callback nfqnl_cb[NFQNL_MSG_MAX] = { |
84a797dd | 1149 | [NFQNL_MSG_PACKET] = { .call_rcu = nfqnl_recv_unsupp, |
37d2e7a2 | 1150 | .attr_count = NFQA_MAX, }, |
84a797dd | 1151 | [NFQNL_MSG_VERDICT] = { .call_rcu = nfqnl_recv_verdict, |
5bf75853 PM |
1152 | .attr_count = NFQA_MAX, |
1153 | .policy = nfqa_verdict_policy }, | |
7af4cc3f | 1154 | [NFQNL_MSG_CONFIG] = { .call = nfqnl_recv_config, |
5bf75853 PM |
1155 | .attr_count = NFQA_CFG_MAX, |
1156 | .policy = nfqa_cfg_policy }, | |
97d32cf9 FW |
1157 | [NFQNL_MSG_VERDICT_BATCH]={ .call_rcu = nfqnl_recv_verdict_batch, |
1158 | .attr_count = NFQA_MAX, | |
1159 | .policy = nfqa_verdict_batch_policy }, | |
7af4cc3f HW |
1160 | }; |
1161 | ||
7c8d4cb4 | 1162 | static const struct nfnetlink_subsystem nfqnl_subsys = { |
7af4cc3f HW |
1163 | .name = "nf_queue", |
1164 | .subsys_id = NFNL_SUBSYS_QUEUE, | |
1165 | .cb_count = NFQNL_MSG_MAX, | |
7af4cc3f HW |
1166 | .cb = nfqnl_cb, |
1167 | }; | |
1168 | ||
838ab636 HW |
1169 | #ifdef CONFIG_PROC_FS |
1170 | struct iter_state { | |
e8179610 | 1171 | struct seq_net_private p; |
838ab636 HW |
1172 | unsigned int bucket; |
1173 | }; | |
1174 | ||
1175 | static struct hlist_node *get_first(struct seq_file *seq) | |
1176 | { | |
1177 | struct iter_state *st = seq->private; | |
e8179610 G |
1178 | struct net *net; |
1179 | struct nfnl_queue_net *q; | |
838ab636 HW |
1180 | |
1181 | if (!st) | |
1182 | return NULL; | |
1183 | ||
e8179610 G |
1184 | net = seq_file_net(seq); |
1185 | q = nfnl_queue_pernet(net); | |
838ab636 | 1186 | for (st->bucket = 0; st->bucket < INSTANCE_BUCKETS; st->bucket++) { |
e8179610 G |
1187 | if (!hlist_empty(&q->instance_table[st->bucket])) |
1188 | return q->instance_table[st->bucket].first; | |
838ab636 HW |
1189 | } |
1190 | return NULL; | |
1191 | } | |
1192 | ||
1193 | static struct hlist_node *get_next(struct seq_file *seq, struct hlist_node *h) | |
1194 | { | |
1195 | struct iter_state *st = seq->private; | |
e8179610 | 1196 | struct net *net = seq_file_net(seq); |
838ab636 HW |
1197 | |
1198 | h = h->next; | |
1199 | while (!h) { | |
e8179610 G |
1200 | struct nfnl_queue_net *q; |
1201 | ||
838ab636 HW |
1202 | if (++st->bucket >= INSTANCE_BUCKETS) |
1203 | return NULL; | |
1204 | ||
e8179610 G |
1205 | q = nfnl_queue_pernet(net); |
1206 | h = q->instance_table[st->bucket].first; | |
838ab636 HW |
1207 | } |
1208 | return h; | |
1209 | } | |
1210 | ||
1211 | static struct hlist_node *get_idx(struct seq_file *seq, loff_t pos) | |
1212 | { | |
1213 | struct hlist_node *head; | |
1214 | head = get_first(seq); | |
1215 | ||
1216 | if (head) | |
1217 | while (pos && (head = get_next(seq, head))) | |
1218 | pos--; | |
1219 | return pos ? NULL : head; | |
1220 | } | |
1221 | ||
e8179610 G |
1222 | static void *seq_start(struct seq_file *s, loff_t *pos) |
1223 | __acquires(nfnl_queue_pernet(seq_file_net(s))->instances_lock) | |
838ab636 | 1224 | { |
e8179610 G |
1225 | spin_lock(&nfnl_queue_pernet(seq_file_net(s))->instances_lock); |
1226 | return get_idx(s, *pos); | |
838ab636 HW |
1227 | } |
1228 | ||
1229 | static void *seq_next(struct seq_file *s, void *v, loff_t *pos) | |
1230 | { | |
1231 | (*pos)++; | |
1232 | return get_next(s, v); | |
1233 | } | |
1234 | ||
1235 | static void seq_stop(struct seq_file *s, void *v) | |
e8179610 | 1236 | __releases(nfnl_queue_pernet(seq_file_net(s))->instances_lock) |
838ab636 | 1237 | { |
e8179610 | 1238 | spin_unlock(&nfnl_queue_pernet(seq_file_net(s))->instances_lock); |
838ab636 HW |
1239 | } |
1240 | ||
1241 | static int seq_show(struct seq_file *s, void *v) | |
1242 | { | |
1243 | const struct nfqnl_instance *inst = v; | |
1244 | ||
1245 | return seq_printf(s, "%5d %6d %5d %1d %5d %5d %5d %8d %2d\n", | |
1246 | inst->queue_num, | |
15e47304 | 1247 | inst->peer_portid, inst->queue_total, |
838ab636 HW |
1248 | inst->copy_mode, inst->copy_range, |
1249 | inst->queue_dropped, inst->queue_user_dropped, | |
5863702a | 1250 | inst->id_sequence, 1); |
838ab636 HW |
1251 | } |
1252 | ||
56b3d975 | 1253 | static const struct seq_operations nfqnl_seq_ops = { |
838ab636 HW |
1254 | .start = seq_start, |
1255 | .next = seq_next, | |
1256 | .stop = seq_stop, | |
1257 | .show = seq_show, | |
1258 | }; | |
1259 | ||
1260 | static int nfqnl_open(struct inode *inode, struct file *file) | |
1261 | { | |
e8179610 | 1262 | return seq_open_net(inode, file, &nfqnl_seq_ops, |
e2da5913 | 1263 | sizeof(struct iter_state)); |
838ab636 HW |
1264 | } |
1265 | ||
da7071d7 | 1266 | static const struct file_operations nfqnl_file_ops = { |
838ab636 HW |
1267 | .owner = THIS_MODULE, |
1268 | .open = nfqnl_open, | |
1269 | .read = seq_read, | |
1270 | .llseek = seq_lseek, | |
e8179610 | 1271 | .release = seq_release_net, |
838ab636 HW |
1272 | }; |
1273 | ||
1274 | #endif /* PROC_FS */ | |
1275 | ||
e8179610 | 1276 | static int __net_init nfnl_queue_net_init(struct net *net) |
7af4cc3f | 1277 | { |
e8179610 G |
1278 | unsigned int i; |
1279 | struct nfnl_queue_net *q = nfnl_queue_pernet(net); | |
601e68e1 | 1280 | |
838ab636 | 1281 | for (i = 0; i < INSTANCE_BUCKETS; i++) |
e8179610 G |
1282 | INIT_HLIST_HEAD(&q->instance_table[i]); |
1283 | ||
1284 | spin_lock_init(&q->instances_lock); | |
1285 | ||
1286 | #ifdef CONFIG_PROC_FS | |
1287 | if (!proc_create("nfnetlink_queue", 0440, | |
1288 | net->nf.proc_netfilter, &nfqnl_file_ops)) | |
1289 | return -ENOMEM; | |
1290 | #endif | |
1291 | return 0; | |
1292 | } | |
1293 | ||
1294 | static void __net_exit nfnl_queue_net_exit(struct net *net) | |
1295 | { | |
e778f56e | 1296 | #ifdef CONFIG_PROC_FS |
e8179610 | 1297 | remove_proc_entry("nfnetlink_queue", net->nf.proc_netfilter); |
e778f56e | 1298 | #endif |
e8179610 G |
1299 | } |
1300 | ||
1301 | static struct pernet_operations nfnl_queue_net_ops = { | |
1302 | .init = nfnl_queue_net_init, | |
1303 | .exit = nfnl_queue_net_exit, | |
1304 | .id = &nfnl_queue_net_id, | |
1305 | .size = sizeof(struct nfnl_queue_net), | |
1306 | }; | |
1307 | ||
1308 | static int __init nfnetlink_queue_init(void) | |
1309 | { | |
1310 | int status = -ENOMEM; | |
838ab636 | 1311 | |
7af4cc3f HW |
1312 | netlink_register_notifier(&nfqnl_rtnl_notifier); |
1313 | status = nfnetlink_subsys_register(&nfqnl_subsys); | |
1314 | if (status < 0) { | |
e8179610 | 1315 | pr_err("nf_queue: failed to create netlink socket\n"); |
7af4cc3f HW |
1316 | goto cleanup_netlink_notifier; |
1317 | } | |
1318 | ||
e8179610 G |
1319 | status = register_pernet_subsys(&nfnl_queue_net_ops); |
1320 | if (status < 0) { | |
1321 | pr_err("nf_queue: failed to register pernet ops\n"); | |
838ab636 | 1322 | goto cleanup_subsys; |
e8179610 | 1323 | } |
7af4cc3f | 1324 | register_netdevice_notifier(&nfqnl_dev_notifier); |
0360ae41 | 1325 | nf_register_queue_handler(&nfqh); |
7af4cc3f HW |
1326 | return status; |
1327 | ||
838ab636 | 1328 | cleanup_subsys: |
7af4cc3f | 1329 | nfnetlink_subsys_unregister(&nfqnl_subsys); |
7af4cc3f HW |
1330 | cleanup_netlink_notifier: |
1331 | netlink_unregister_notifier(&nfqnl_rtnl_notifier); | |
1332 | return status; | |
1333 | } | |
1334 | ||
65b4b4e8 | 1335 | static void __exit nfnetlink_queue_fini(void) |
7af4cc3f | 1336 | { |
0360ae41 | 1337 | nf_unregister_queue_handler(); |
32292a7f | 1338 | unregister_netdevice_notifier(&nfqnl_dev_notifier); |
e8179610 | 1339 | unregister_pernet_subsys(&nfnl_queue_net_ops); |
32292a7f PM |
1340 | nfnetlink_subsys_unregister(&nfqnl_subsys); |
1341 | netlink_unregister_notifier(&nfqnl_rtnl_notifier); | |
67137f3c JDB |
1342 | |
1343 | rcu_barrier(); /* Wait for completion of call_rcu()'s */ | |
7af4cc3f HW |
1344 | } |
1345 | ||
1346 | MODULE_DESCRIPTION("netfilter packet queue handler"); | |
1347 | MODULE_AUTHOR("Harald Welte <laforge@netfilter.org>"); | |
1348 | MODULE_LICENSE("GPL"); | |
1349 | MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_QUEUE); | |
1350 | ||
65b4b4e8 AM |
1351 | module_init(nfnetlink_queue_init); |
1352 | module_exit(nfnetlink_queue_fini); |