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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> | |
b7bd1809 | 31 | #include <linux/netfilter/nf_conntrack_common.h> |
7af4cc3f HW |
32 | #include <linux/list.h> |
33 | #include <net/sock.h> | |
83111e7f | 34 | #include <net/tcp_states.h> |
c01cd429 | 35 | #include <net/netfilter/nf_queue.h> |
e8179610 | 36 | #include <net/netns/generic.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 | */ | |
886bc503 | 72 | spinlock_t lock ____cacheline_aligned_in_smp; |
c463ac97 | 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 | |
c7d03a00 | 80 | static unsigned 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 | ||
ef493bd9 RK |
281 | static u32 nfqnl_get_sk_secctx(struct sk_buff *skb, char **secdata) |
282 | { | |
283 | u32 seclen = 0; | |
284 | #if IS_ENABLED(CONFIG_NETWORK_SECMARK) | |
285 | if (!skb || !sk_fullsock(skb->sk)) | |
286 | return 0; | |
287 | ||
288 | read_lock_bh(&skb->sk->sk_callback_lock); | |
289 | ||
290 | if (skb->secmark) | |
291 | security_secid_to_secctx(skb->secmark, secdata, &seclen); | |
292 | ||
293 | read_unlock_bh(&skb->sk->sk_callback_lock); | |
294 | #endif | |
295 | return seclen; | |
296 | } | |
297 | ||
15824ab2 SB |
298 | static u32 nfqnl_get_bridge_size(struct nf_queue_entry *entry) |
299 | { | |
300 | struct sk_buff *entskb = entry->skb; | |
301 | u32 nlalen = 0; | |
302 | ||
303 | if (entry->state.pf != PF_BRIDGE || !skb_mac_header_was_set(entskb)) | |
304 | return 0; | |
305 | ||
306 | if (skb_vlan_tag_present(entskb)) | |
307 | nlalen += nla_total_size(nla_total_size(sizeof(__be16)) + | |
308 | nla_total_size(sizeof(__be16))); | |
309 | ||
310 | if (entskb->network_header > entskb->mac_header) | |
311 | nlalen += nla_total_size((entskb->network_header - | |
312 | entskb->mac_header)); | |
313 | ||
314 | return nlalen; | |
315 | } | |
316 | ||
317 | static int nfqnl_put_bridge(struct nf_queue_entry *entry, struct sk_buff *skb) | |
318 | { | |
319 | struct sk_buff *entskb = entry->skb; | |
320 | ||
321 | if (entry->state.pf != PF_BRIDGE || !skb_mac_header_was_set(entskb)) | |
322 | return 0; | |
323 | ||
324 | if (skb_vlan_tag_present(entskb)) { | |
325 | struct nlattr *nest; | |
326 | ||
327 | nest = nla_nest_start(skb, NFQA_VLAN | NLA_F_NESTED); | |
328 | if (!nest) | |
329 | goto nla_put_failure; | |
330 | ||
331 | if (nla_put_be16(skb, NFQA_VLAN_TCI, htons(entskb->vlan_tci)) || | |
332 | nla_put_be16(skb, NFQA_VLAN_PROTO, entskb->vlan_proto)) | |
333 | goto nla_put_failure; | |
334 | ||
335 | nla_nest_end(skb, nest); | |
336 | } | |
337 | ||
338 | if (entskb->mac_header < entskb->network_header) { | |
339 | int len = (int)(entskb->network_header - entskb->mac_header); | |
340 | ||
341 | if (nla_put(skb, NFQA_L2HDR, len, skb_mac_header(entskb))) | |
342 | goto nla_put_failure; | |
343 | } | |
344 | ||
345 | return 0; | |
346 | ||
347 | nla_put_failure: | |
348 | return -1; | |
349 | } | |
350 | ||
7af4cc3f | 351 | static struct sk_buff * |
74332687 | 352 | nfqnl_build_packet_message(struct net *net, struct nfqnl_instance *queue, |
5863702a ED |
353 | struct nf_queue_entry *entry, |
354 | __be32 **packet_id_ptr) | |
7af4cc3f | 355 | { |
7af4cc3f | 356 | size_t size; |
c5b0db32 | 357 | size_t data_len = 0, cap_len = 0; |
af2806f8 | 358 | unsigned int hlen = 0; |
7af4cc3f | 359 | struct sk_buff *skb; |
5863702a ED |
360 | struct nlattr *nla; |
361 | struct nfqnl_msg_packet_hdr *pmsg; | |
7af4cc3f HW |
362 | struct nlmsghdr *nlh; |
363 | struct nfgenmsg *nfmsg; | |
3e4ead4f JJ |
364 | struct sk_buff *entskb = entry->skb; |
365 | struct net_device *indev; | |
366 | struct net_device *outdev; | |
9cb01766 PNA |
367 | struct nf_conn *ct = NULL; |
368 | enum ip_conntrack_info uninitialized_var(ctinfo); | |
a4b4766c | 369 | struct nfnl_ct_hook *nfnl_ct; |
496e4ae7 | 370 | bool csum_verify; |
ef493bd9 RK |
371 | char *secdata = NULL; |
372 | u32 seclen = 0; | |
7af4cc3f | 373 | |
573ce260 | 374 | size = nlmsg_total_size(sizeof(struct nfgenmsg)) |
df6fb868 PM |
375 | + nla_total_size(sizeof(struct nfqnl_msg_packet_hdr)) |
376 | + nla_total_size(sizeof(u_int32_t)) /* ifindex */ | |
377 | + nla_total_size(sizeof(u_int32_t)) /* ifindex */ | |
1109a90c | 378 | #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER) |
df6fb868 PM |
379 | + nla_total_size(sizeof(u_int32_t)) /* ifindex */ |
380 | + nla_total_size(sizeof(u_int32_t)) /* ifindex */ | |
fbcd923c | 381 | #endif |
df6fb868 PM |
382 | + nla_total_size(sizeof(u_int32_t)) /* mark */ |
383 | + nla_total_size(sizeof(struct nfqnl_msg_packet_hw)) | |
7237190d | 384 | + nla_total_size(sizeof(u_int32_t)) /* skbinfo */ |
ae08ce00 ED |
385 | + nla_total_size(sizeof(u_int32_t)); /* cap_len */ |
386 | ||
2456e855 | 387 | if (entskb->tstamp) |
ae08ce00 | 388 | size += nla_total_size(sizeof(struct nfqnl_msg_packet_timestamp)); |
7af4cc3f | 389 | |
15824ab2 SB |
390 | size += nfqnl_get_bridge_size(entry); |
391 | ||
1d1de89b DM |
392 | if (entry->state.hook <= NF_INET_FORWARD || |
393 | (entry->state.hook == NF_INET_POST_ROUTING && entskb->sk == NULL)) | |
496e4ae7 FW |
394 | csum_verify = !skb_csum_unnecessary(entskb); |
395 | else | |
396 | csum_verify = false; | |
397 | ||
1d1de89b | 398 | outdev = entry->state.out; |
3e4ead4f | 399 | |
c463ac97 | 400 | switch ((enum nfqnl_config_mode)ACCESS_ONCE(queue->copy_mode)) { |
7af4cc3f HW |
401 | case NFQNL_COPY_META: |
402 | case NFQNL_COPY_NONE: | |
7af4cc3f | 403 | break; |
601e68e1 | 404 | |
7af4cc3f | 405 | case NFQNL_COPY_PACKET: |
00bd1cc2 FW |
406 | if (!(queue->flags & NFQA_CFG_F_GSO) && |
407 | entskb->ip_summed == CHECKSUM_PARTIAL && | |
c463ac97 | 408 | skb_checksum_help(entskb)) |
e7dfb09a | 409 | return NULL; |
c463ac97 ED |
410 | |
411 | data_len = ACCESS_ONCE(queue->copy_range); | |
9cefbbc9 | 412 | if (data_len > entskb->len) |
3e4ead4f | 413 | data_len = entskb->len; |
601e68e1 | 414 | |
af2806f8 TG |
415 | hlen = skb_zerocopy_headlen(entskb); |
416 | hlen = min_t(unsigned int, hlen, data_len); | |
ae08ce00 | 417 | size += sizeof(struct nlattr) + hlen; |
6ee584be | 418 | cap_len = entskb->len; |
7af4cc3f | 419 | break; |
7af4cc3f HW |
420 | } |
421 | ||
8e662164 AB |
422 | nfnl_ct = rcu_dereference(nfnl_ct_hook); |
423 | ||
b7bd1809 | 424 | if (queue->flags & NFQA_CFG_F_CONNTRACK) { |
a4b4766c KM |
425 | if (nfnl_ct != NULL) { |
426 | ct = nfnl_ct->get_ct(entskb, &ctinfo); | |
b7bd1809 | 427 | if (ct != NULL) |
a4b4766c | 428 | size += nfnl_ct->build_size(ct); |
b7bd1809 PNA |
429 | } |
430 | } | |
7af4cc3f | 431 | |
08c0cad6 VG |
432 | if (queue->flags & NFQA_CFG_F_UID_GID) { |
433 | size += (nla_total_size(sizeof(u_int32_t)) /* uid */ | |
434 | + nla_total_size(sizeof(u_int32_t))); /* gid */ | |
435 | } | |
436 | ||
ef493bd9 RK |
437 | if ((queue->flags & NFQA_CFG_F_SECCTX) && entskb->sk) { |
438 | seclen = nfqnl_get_sk_secctx(entskb, &secdata); | |
439 | if (seclen) | |
440 | size += nla_total_size(seclen); | |
441 | } | |
442 | ||
c5b0db32 | 443 | skb = alloc_skb(size, GFP_ATOMIC); |
36d5fe6a ZK |
444 | if (!skb) { |
445 | skb_tx_error(entskb); | |
77c1c03c | 446 | goto nlmsg_failure; |
36d5fe6a | 447 | } |
601e68e1 | 448 | |
3da07c0c | 449 | nlh = nlmsg_put(skb, 0, 0, |
dedb67c4 | 450 | nfnl_msg_type(NFNL_SUBSYS_QUEUE, NFQNL_MSG_PACKET), |
3da07c0c DM |
451 | sizeof(struct nfgenmsg), 0); |
452 | if (!nlh) { | |
36d5fe6a | 453 | skb_tx_error(entskb); |
3da07c0c | 454 | kfree_skb(skb); |
77c1c03c | 455 | goto nlmsg_failure; |
3da07c0c DM |
456 | } |
457 | nfmsg = nlmsg_data(nlh); | |
1d1de89b | 458 | nfmsg->nfgen_family = entry->state.pf; |
7af4cc3f HW |
459 | nfmsg->version = NFNETLINK_V0; |
460 | nfmsg->res_id = htons(queue->queue_num); | |
461 | ||
5863702a ED |
462 | nla = __nla_reserve(skb, NFQA_PACKET_HDR, sizeof(*pmsg)); |
463 | pmsg = nla_data(nla); | |
464 | pmsg->hw_protocol = entskb->protocol; | |
1d1de89b | 465 | pmsg->hook = entry->state.hook; |
5863702a | 466 | *packet_id_ptr = &pmsg->packet_id; |
7af4cc3f | 467 | |
1d1de89b | 468 | indev = entry->state.in; |
3e4ead4f | 469 | if (indev) { |
1109a90c | 470 | #if !IS_ENABLED(CONFIG_BRIDGE_NETFILTER) |
a447189e DM |
471 | if (nla_put_be32(skb, NFQA_IFINDEX_INDEV, htonl(indev->ifindex))) |
472 | goto nla_put_failure; | |
fbcd923c | 473 | #else |
1d1de89b | 474 | if (entry->state.pf == PF_BRIDGE) { |
fbcd923c | 475 | /* Case 1: indev is physical input device, we need to |
601e68e1 | 476 | * look for bridge group (when called from |
fbcd923c | 477 | * netfilter_bridge) */ |
a447189e DM |
478 | if (nla_put_be32(skb, NFQA_IFINDEX_PHYSINDEV, |
479 | htonl(indev->ifindex)) || | |
fbcd923c | 480 | /* this is the bridge group "brX" */ |
f350a0a8 | 481 | /* rcu_read_lock()ed by __nf_queue */ |
a447189e DM |
482 | nla_put_be32(skb, NFQA_IFINDEX_INDEV, |
483 | htonl(br_port_get_rcu(indev)->br->dev->ifindex))) | |
484 | goto nla_put_failure; | |
fbcd923c | 485 | } else { |
c737b7c4 FW |
486 | int physinif; |
487 | ||
fbcd923c HW |
488 | /* Case 2: indev is bridge group, we need to look for |
489 | * physical device (when called from ipv4) */ | |
a447189e DM |
490 | if (nla_put_be32(skb, NFQA_IFINDEX_INDEV, |
491 | htonl(indev->ifindex))) | |
492 | goto nla_put_failure; | |
c737b7c4 FW |
493 | |
494 | physinif = nf_bridge_get_physinif(entskb); | |
495 | if (physinif && | |
a447189e | 496 | nla_put_be32(skb, NFQA_IFINDEX_PHYSINDEV, |
c737b7c4 | 497 | htonl(physinif))) |
a447189e | 498 | goto nla_put_failure; |
fbcd923c HW |
499 | } |
500 | #endif | |
7af4cc3f HW |
501 | } |
502 | ||
3e4ead4f | 503 | if (outdev) { |
1109a90c | 504 | #if !IS_ENABLED(CONFIG_BRIDGE_NETFILTER) |
a447189e DM |
505 | if (nla_put_be32(skb, NFQA_IFINDEX_OUTDEV, htonl(outdev->ifindex))) |
506 | goto nla_put_failure; | |
fbcd923c | 507 | #else |
1d1de89b | 508 | if (entry->state.pf == PF_BRIDGE) { |
fbcd923c | 509 | /* Case 1: outdev is physical output device, we need to |
601e68e1 | 510 | * look for bridge group (when called from |
fbcd923c | 511 | * netfilter_bridge) */ |
a447189e DM |
512 | if (nla_put_be32(skb, NFQA_IFINDEX_PHYSOUTDEV, |
513 | htonl(outdev->ifindex)) || | |
fbcd923c | 514 | /* this is the bridge group "brX" */ |
f350a0a8 | 515 | /* rcu_read_lock()ed by __nf_queue */ |
a447189e DM |
516 | nla_put_be32(skb, NFQA_IFINDEX_OUTDEV, |
517 | htonl(br_port_get_rcu(outdev)->br->dev->ifindex))) | |
518 | goto nla_put_failure; | |
fbcd923c | 519 | } else { |
c737b7c4 FW |
520 | int physoutif; |
521 | ||
fbcd923c HW |
522 | /* Case 2: outdev is bridge group, we need to look for |
523 | * physical output device (when called from ipv4) */ | |
a447189e DM |
524 | if (nla_put_be32(skb, NFQA_IFINDEX_OUTDEV, |
525 | htonl(outdev->ifindex))) | |
526 | goto nla_put_failure; | |
c737b7c4 FW |
527 | |
528 | physoutif = nf_bridge_get_physoutif(entskb); | |
529 | if (physoutif && | |
a447189e | 530 | nla_put_be32(skb, NFQA_IFINDEX_PHYSOUTDEV, |
c737b7c4 | 531 | htonl(physoutif))) |
a447189e | 532 | goto nla_put_failure; |
fbcd923c HW |
533 | } |
534 | #endif | |
7af4cc3f HW |
535 | } |
536 | ||
a447189e DM |
537 | if (entskb->mark && |
538 | nla_put_be32(skb, NFQA_MARK, htonl(entskb->mark))) | |
539 | goto nla_put_failure; | |
7af4cc3f | 540 | |
2c38de4c NC |
541 | if (indev && entskb->dev && |
542 | entskb->mac_header != entskb->network_header) { | |
7af4cc3f | 543 | struct nfqnl_msg_packet_hw phw; |
e4d091d7 DC |
544 | int len; |
545 | ||
546 | memset(&phw, 0, sizeof(phw)); | |
547 | len = dev_parse_header(entskb, phw.hw_addr); | |
b95cce35 SH |
548 | if (len) { |
549 | phw.hw_addrlen = htons(len); | |
a447189e DM |
550 | if (nla_put(skb, NFQA_HWADDR, sizeof(phw), &phw)) |
551 | goto nla_put_failure; | |
b95cce35 | 552 | } |
7af4cc3f HW |
553 | } |
554 | ||
15824ab2 SB |
555 | if (nfqnl_put_bridge(entry, skb) < 0) |
556 | goto nla_put_failure; | |
557 | ||
2456e855 | 558 | if (entskb->tstamp) { |
7af4cc3f | 559 | struct nfqnl_msg_packet_timestamp ts; |
a7f18845 | 560 | struct timespec64 kts = ktime_to_timespec64(entskb->tstamp); |
b28b1e82 PNA |
561 | |
562 | ts.sec = cpu_to_be64(kts.tv_sec); | |
563 | ts.usec = cpu_to_be64(kts.tv_nsec / NSEC_PER_USEC); | |
7af4cc3f | 564 | |
a447189e DM |
565 | if (nla_put(skb, NFQA_TIMESTAMP, sizeof(ts), &ts)) |
566 | goto nla_put_failure; | |
7af4cc3f HW |
567 | } |
568 | ||
08c0cad6 VG |
569 | if ((queue->flags & NFQA_CFG_F_UID_GID) && entskb->sk && |
570 | nfqnl_put_sk_uidgid(skb, entskb->sk) < 0) | |
571 | goto nla_put_failure; | |
572 | ||
ef493bd9 RK |
573 | if (seclen && nla_put(skb, NFQA_SECCTX, seclen, secdata)) |
574 | goto nla_put_failure; | |
575 | ||
a4b4766c | 576 | if (ct && nfnl_ct->build(skb, ct, ctinfo, NFQA_CT, NFQA_CT_INFO) < 0) |
ae08ce00 ED |
577 | goto nla_put_failure; |
578 | ||
7f87712c FW |
579 | if (cap_len > data_len && |
580 | nla_put_be32(skb, NFQA_CAP_LEN, htonl(cap_len))) | |
ae08ce00 ED |
581 | goto nla_put_failure; |
582 | ||
496e4ae7 | 583 | if (nfqnl_put_packet_info(skb, entskb, csum_verify)) |
7237190d FW |
584 | goto nla_put_failure; |
585 | ||
7af4cc3f | 586 | if (data_len) { |
df6fb868 | 587 | struct nlattr *nla; |
7af4cc3f | 588 | |
ae08ce00 ED |
589 | if (skb_tailroom(skb) < sizeof(*nla) + hlen) |
590 | goto nla_put_failure; | |
7af4cc3f | 591 | |
ae08ce00 | 592 | nla = (struct nlattr *)skb_put(skb, sizeof(*nla)); |
df6fb868 | 593 | nla->nla_type = NFQA_PAYLOAD; |
ae08ce00 | 594 | nla->nla_len = nla_attr_size(data_len); |
7af4cc3f | 595 | |
36d5fe6a ZK |
596 | if (skb_zerocopy(skb, entskb, data_len, hlen)) |
597 | goto nla_put_failure; | |
7af4cc3f | 598 | } |
601e68e1 | 599 | |
ae08ce00 | 600 | nlh->nlmsg_len = skb->len; |
77c1c03c LZ |
601 | if (seclen) |
602 | security_release_secctx(secdata, seclen); | |
7af4cc3f HW |
603 | return skb; |
604 | ||
df6fb868 | 605 | nla_put_failure: |
36d5fe6a | 606 | skb_tx_error(entskb); |
a6729955 | 607 | kfree_skb(skb); |
e87cc472 | 608 | net_err_ratelimited("nf_queue: error creating packet message\n"); |
77c1c03c LZ |
609 | nlmsg_failure: |
610 | if (seclen) | |
611 | security_release_secctx(secdata, seclen); | |
7af4cc3f HW |
612 | return NULL; |
613 | } | |
614 | ||
615 | static int | |
a5fedd43 FW |
616 | __nfqnl_enqueue_packet(struct net *net, struct nfqnl_instance *queue, |
617 | struct nf_queue_entry *entry) | |
7af4cc3f | 618 | { |
7af4cc3f | 619 | struct sk_buff *nskb; |
f1585086 | 620 | int err = -ENOBUFS; |
5863702a | 621 | __be32 *packet_id_ptr; |
fdb694a0 | 622 | int failopen = 0; |
7af4cc3f | 623 | |
74332687 | 624 | nskb = nfqnl_build_packet_message(net, queue, entry, &packet_id_ptr); |
f1585086 FW |
625 | if (nskb == NULL) { |
626 | err = -ENOMEM; | |
0ef0f465 | 627 | goto err_out; |
f1585086 | 628 | } |
7af4cc3f | 629 | spin_lock_bh(&queue->lock); |
601e68e1 | 630 | |
7af4cc3f | 631 | if (queue->queue_total >= queue->queue_maxlen) { |
fdb694a0 KK |
632 | if (queue->flags & NFQA_CFG_F_FAIL_OPEN) { |
633 | failopen = 1; | |
634 | err = 0; | |
635 | } else { | |
636 | queue->queue_dropped++; | |
637 | net_warn_ratelimited("nf_queue: full at %d entries, dropping packets(s)\n", | |
638 | queue->queue_total); | |
639 | } | |
7af4cc3f HW |
640 | goto err_out_free_nskb; |
641 | } | |
5863702a ED |
642 | entry->id = ++queue->id_sequence; |
643 | *packet_id_ptr = htonl(entry->id); | |
7af4cc3f HW |
644 | |
645 | /* nfnetlink_unicast will either free the nskb or add it to a socket */ | |
e8179610 | 646 | err = nfnetlink_unicast(nskb, net, queue->peer_portid, MSG_DONTWAIT); |
0ef0f465 | 647 | if (err < 0) { |
93140113 PNA |
648 | if (queue->flags & NFQA_CFG_F_FAIL_OPEN) { |
649 | failopen = 1; | |
650 | err = 0; | |
651 | } else { | |
652 | queue->queue_user_dropped++; | |
653 | } | |
7af4cc3f HW |
654 | goto err_out_unlock; |
655 | } | |
656 | ||
657 | __enqueue_entry(queue, entry); | |
658 | ||
659 | spin_unlock_bh(&queue->lock); | |
0ef0f465 | 660 | return 0; |
7af4cc3f HW |
661 | |
662 | err_out_free_nskb: | |
601e68e1 | 663 | kfree_skb(nskb); |
7af4cc3f HW |
664 | err_out_unlock: |
665 | spin_unlock_bh(&queue->lock); | |
fdb694a0 KK |
666 | if (failopen) |
667 | nf_reinject(entry, NF_ACCEPT); | |
0ef0f465 | 668 | err_out: |
f1585086 | 669 | return err; |
7af4cc3f HW |
670 | } |
671 | ||
a5fedd43 FW |
672 | static struct nf_queue_entry * |
673 | nf_queue_entry_dup(struct nf_queue_entry *e) | |
674 | { | |
675 | struct nf_queue_entry *entry = kmemdup(e, e->size, GFP_ATOMIC); | |
ed78d09d FW |
676 | if (entry) |
677 | nf_queue_entry_get_refs(entry); | |
678 | return entry; | |
a5fedd43 FW |
679 | } |
680 | ||
1109a90c | 681 | #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER) |
a5fedd43 FW |
682 | /* When called from bridge netfilter, skb->data must point to MAC header |
683 | * before calling skb_gso_segment(). Else, original MAC header is lost | |
684 | * and segmented skbs will be sent to wrong destination. | |
685 | */ | |
686 | static void nf_bridge_adjust_skb_data(struct sk_buff *skb) | |
687 | { | |
688 | if (skb->nf_bridge) | |
689 | __skb_push(skb, skb->network_header - skb->mac_header); | |
690 | } | |
691 | ||
692 | static void nf_bridge_adjust_segmented_data(struct sk_buff *skb) | |
693 | { | |
694 | if (skb->nf_bridge) | |
695 | __skb_pull(skb, skb->network_header - skb->mac_header); | |
696 | } | |
697 | #else | |
698 | #define nf_bridge_adjust_skb_data(s) do {} while (0) | |
699 | #define nf_bridge_adjust_segmented_data(s) do {} while (0) | |
700 | #endif | |
701 | ||
702 | static void free_entry(struct nf_queue_entry *entry) | |
703 | { | |
704 | nf_queue_entry_release_refs(entry); | |
705 | kfree(entry); | |
706 | } | |
707 | ||
708 | static int | |
709 | __nfqnl_enqueue_packet_gso(struct net *net, struct nfqnl_instance *queue, | |
710 | struct sk_buff *skb, struct nf_queue_entry *entry) | |
711 | { | |
712 | int ret = -ENOMEM; | |
713 | struct nf_queue_entry *entry_seg; | |
714 | ||
715 | nf_bridge_adjust_segmented_data(skb); | |
716 | ||
717 | if (skb->next == NULL) { /* last packet, no need to copy entry */ | |
718 | struct sk_buff *gso_skb = entry->skb; | |
719 | entry->skb = skb; | |
720 | ret = __nfqnl_enqueue_packet(net, queue, entry); | |
721 | if (ret) | |
722 | entry->skb = gso_skb; | |
723 | return ret; | |
724 | } | |
725 | ||
726 | skb->next = NULL; | |
727 | ||
728 | entry_seg = nf_queue_entry_dup(entry); | |
729 | if (entry_seg) { | |
730 | entry_seg->skb = skb; | |
731 | ret = __nfqnl_enqueue_packet(net, queue, entry_seg); | |
732 | if (ret) | |
733 | free_entry(entry_seg); | |
734 | } | |
735 | return ret; | |
736 | } | |
737 | ||
738 | static int | |
739 | nfqnl_enqueue_packet(struct nf_queue_entry *entry, unsigned int queuenum) | |
740 | { | |
741 | unsigned int queued; | |
742 | struct nfqnl_instance *queue; | |
743 | struct sk_buff *skb, *segs; | |
744 | int err = -ENOBUFS; | |
9dff2c96 | 745 | struct net *net = entry->state.net; |
a5fedd43 FW |
746 | struct nfnl_queue_net *q = nfnl_queue_pernet(net); |
747 | ||
e2361cb9 | 748 | /* rcu_read_lock()ed by nf_hook_thresh */ |
a5fedd43 FW |
749 | queue = instance_lookup(q, queuenum); |
750 | if (!queue) | |
751 | return -ESRCH; | |
752 | ||
753 | if (queue->copy_mode == NFQNL_COPY_NONE) | |
754 | return -EINVAL; | |
755 | ||
a5fedd43 FW |
756 | skb = entry->skb; |
757 | ||
1d1de89b | 758 | switch (entry->state.pf) { |
a5fedd43 FW |
759 | case NFPROTO_IPV4: |
760 | skb->protocol = htons(ETH_P_IP); | |
761 | break; | |
762 | case NFPROTO_IPV6: | |
763 | skb->protocol = htons(ETH_P_IPV6); | |
764 | break; | |
765 | } | |
766 | ||
7b8dfe28 PNA |
767 | if ((queue->flags & NFQA_CFG_F_GSO) || !skb_is_gso(skb)) |
768 | return __nfqnl_enqueue_packet(net, queue, entry); | |
769 | ||
a5fedd43 FW |
770 | nf_bridge_adjust_skb_data(skb); |
771 | segs = skb_gso_segment(skb, 0); | |
772 | /* Does not use PTR_ERR to limit the number of error codes that can be | |
ed78d09d | 773 | * returned by nf_queue. For instance, callers rely on -ESRCH to |
a5fedd43 FW |
774 | * mean 'ignore this hook'. |
775 | */ | |
330966e5 | 776 | if (IS_ERR_OR_NULL(segs)) |
a5fedd43 FW |
777 | goto out_err; |
778 | queued = 0; | |
779 | err = 0; | |
780 | do { | |
781 | struct sk_buff *nskb = segs->next; | |
782 | if (err == 0) | |
783 | err = __nfqnl_enqueue_packet_gso(net, queue, | |
784 | segs, entry); | |
785 | if (err == 0) | |
786 | queued++; | |
787 | else | |
788 | kfree_skb(segs); | |
789 | segs = nskb; | |
790 | } while (segs); | |
791 | ||
792 | if (queued) { | |
793 | if (err) /* some segments are already queued */ | |
794 | free_entry(entry); | |
795 | kfree_skb(skb); | |
796 | return 0; | |
797 | } | |
798 | out_err: | |
799 | nf_bridge_adjust_segmented_data(skb); | |
800 | return err; | |
801 | } | |
802 | ||
7af4cc3f | 803 | static int |
8c88f87c | 804 | nfqnl_mangle(void *data, int data_len, struct nf_queue_entry *e, int diff) |
7af4cc3f | 805 | { |
e2b58a67 | 806 | struct sk_buff *nskb; |
7af4cc3f | 807 | |
d8a585d7 PM |
808 | if (diff < 0) { |
809 | if (pskb_trim(e->skb, data_len)) | |
810 | return -ENOMEM; | |
811 | } else if (diff > 0) { | |
7af4cc3f HW |
812 | if (data_len > 0xFFFF) |
813 | return -EINVAL; | |
814 | if (diff > skb_tailroom(e->skb)) { | |
9a732ed6 AE |
815 | nskb = skb_copy_expand(e->skb, skb_headroom(e->skb), |
816 | diff, GFP_ATOMIC); | |
e2b58a67 | 817 | if (!nskb) { |
1158ba27 | 818 | printk(KERN_WARNING "nf_queue: OOM " |
7af4cc3f | 819 | "in mangle, dropping packet\n"); |
e2b58a67 | 820 | return -ENOMEM; |
7af4cc3f | 821 | } |
e2b58a67 PM |
822 | kfree_skb(e->skb); |
823 | e->skb = nskb; | |
7af4cc3f HW |
824 | } |
825 | skb_put(e->skb, diff); | |
826 | } | |
37d41879 | 827 | if (!skb_make_writable(e->skb, data_len)) |
7af4cc3f | 828 | return -ENOMEM; |
27d7ff46 | 829 | skb_copy_to_linear_data(e->skb, data, data_len); |
e7dfb09a | 830 | e->skb->ip_summed = CHECKSUM_NONE; |
7af4cc3f HW |
831 | return 0; |
832 | } | |
833 | ||
7af4cc3f HW |
834 | static int |
835 | nfqnl_set_mode(struct nfqnl_instance *queue, | |
836 | unsigned char mode, unsigned int range) | |
837 | { | |
c5de0dfd | 838 | int status = 0; |
7af4cc3f HW |
839 | |
840 | spin_lock_bh(&queue->lock); | |
c5de0dfd PM |
841 | switch (mode) { |
842 | case NFQNL_COPY_NONE: | |
843 | case NFQNL_COPY_META: | |
844 | queue->copy_mode = mode; | |
845 | queue->copy_range = 0; | |
846 | break; | |
847 | ||
848 | case NFQNL_COPY_PACKET: | |
849 | queue->copy_mode = mode; | |
9cefbbc9 FW |
850 | if (range == 0 || range > NFQNL_MAX_COPY_RANGE) |
851 | queue->copy_range = NFQNL_MAX_COPY_RANGE; | |
c5de0dfd PM |
852 | else |
853 | queue->copy_range = range; | |
854 | break; | |
855 | ||
856 | default: | |
857 | status = -EINVAL; | |
858 | ||
859 | } | |
7af4cc3f HW |
860 | spin_unlock_bh(&queue->lock); |
861 | ||
862 | return status; | |
863 | } | |
864 | ||
865 | static int | |
02f014d8 | 866 | dev_cmp(struct nf_queue_entry *entry, unsigned long ifindex) |
7af4cc3f | 867 | { |
1d1de89b DM |
868 | if (entry->state.in) |
869 | if (entry->state.in->ifindex == ifindex) | |
7af4cc3f | 870 | return 1; |
1d1de89b DM |
871 | if (entry->state.out) |
872 | if (entry->state.out->ifindex == ifindex) | |
7af4cc3f | 873 | return 1; |
1109a90c | 874 | #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER) |
ef47c6a7 | 875 | if (entry->skb->nf_bridge) { |
c737b7c4 FW |
876 | int physinif, physoutif; |
877 | ||
878 | physinif = nf_bridge_get_physinif(entry->skb); | |
879 | physoutif = nf_bridge_get_physoutif(entry->skb); | |
880 | ||
881 | if (physinif == ifindex || physoutif == ifindex) | |
ef47c6a7 PM |
882 | return 1; |
883 | } | |
884 | #endif | |
7af4cc3f HW |
885 | return 0; |
886 | } | |
887 | ||
888 | /* drop all packets with either indev or outdev == ifindex from all queue | |
889 | * instances */ | |
890 | static void | |
e8179610 | 891 | nfqnl_dev_drop(struct net *net, int ifindex) |
7af4cc3f HW |
892 | { |
893 | int i; | |
e8179610 | 894 | struct nfnl_queue_net *q = nfnl_queue_pernet(net); |
601e68e1 | 895 | |
9872bec7 | 896 | rcu_read_lock(); |
7af4cc3f | 897 | |
9872bec7 | 898 | for (i = 0; i < INSTANCE_BUCKETS; i++) { |
7af4cc3f | 899 | struct nfqnl_instance *inst; |
e8179610 | 900 | struct hlist_head *head = &q->instance_table[i]; |
7af4cc3f | 901 | |
b67bfe0d | 902 | hlist_for_each_entry_rcu(inst, head, hlist) |
b43d8d85 | 903 | nfqnl_flush(inst, dev_cmp, ifindex); |
7af4cc3f HW |
904 | } |
905 | ||
9872bec7 | 906 | rcu_read_unlock(); |
7af4cc3f HW |
907 | } |
908 | ||
7af4cc3f HW |
909 | static int |
910 | nfqnl_rcv_dev_event(struct notifier_block *this, | |
911 | unsigned long event, void *ptr) | |
912 | { | |
351638e7 | 913 | struct net_device *dev = netdev_notifier_info_to_dev(ptr); |
7af4cc3f HW |
914 | |
915 | /* Drop any packets associated with the downed device */ | |
916 | if (event == NETDEV_DOWN) | |
e8179610 | 917 | nfqnl_dev_drop(dev_net(dev), dev->ifindex); |
7af4cc3f HW |
918 | return NOTIFY_DONE; |
919 | } | |
920 | ||
921 | static struct notifier_block nfqnl_dev_notifier = { | |
922 | .notifier_call = nfqnl_rcv_dev_event, | |
923 | }; | |
924 | ||
e3b37f11 | 925 | static int nf_hook_cmp(struct nf_queue_entry *entry, unsigned long entry_ptr) |
8405a8ff | 926 | { |
01886bd9 | 927 | return rcu_access_pointer(entry->hook) == |
e3b37f11 | 928 | (struct nf_hook_entry *)entry_ptr; |
8405a8ff EB |
929 | } |
930 | ||
e3b37f11 AC |
931 | static void nfqnl_nf_hook_drop(struct net *net, |
932 | const struct nf_hook_entry *hook) | |
8405a8ff EB |
933 | { |
934 | struct nfnl_queue_net *q = nfnl_queue_pernet(net); | |
935 | int i; | |
936 | ||
937 | rcu_read_lock(); | |
938 | for (i = 0; i < INSTANCE_BUCKETS; i++) { | |
939 | struct nfqnl_instance *inst; | |
940 | struct hlist_head *head = &q->instance_table[i]; | |
941 | ||
942 | hlist_for_each_entry_rcu(inst, head, hlist) | |
943 | nfqnl_flush(inst, nf_hook_cmp, (unsigned long)hook); | |
944 | } | |
945 | rcu_read_unlock(); | |
946 | } | |
947 | ||
7af4cc3f HW |
948 | static int |
949 | nfqnl_rcv_nl_event(struct notifier_block *this, | |
950 | unsigned long event, void *ptr) | |
951 | { | |
952 | struct netlink_notify *n = ptr; | |
e8179610 | 953 | struct nfnl_queue_net *q = nfnl_queue_pernet(n->net); |
7af4cc3f | 954 | |
dee5817e | 955 | if (event == NETLINK_URELEASE && n->protocol == NETLINK_NETFILTER) { |
7af4cc3f HW |
956 | int i; |
957 | ||
15e47304 | 958 | /* destroy all instances for this portid */ |
e8179610 | 959 | spin_lock(&q->instances_lock); |
9872bec7 | 960 | for (i = 0; i < INSTANCE_BUCKETS; i++) { |
b67bfe0d | 961 | struct hlist_node *t2; |
7af4cc3f | 962 | struct nfqnl_instance *inst; |
e8179610 | 963 | struct hlist_head *head = &q->instance_table[i]; |
7af4cc3f | 964 | |
b67bfe0d | 965 | hlist_for_each_entry_safe(inst, t2, head, hlist) { |
e8179610 | 966 | if (n->portid == inst->peer_portid) |
7af4cc3f HW |
967 | __instance_destroy(inst); |
968 | } | |
969 | } | |
e8179610 | 970 | spin_unlock(&q->instances_lock); |
7af4cc3f HW |
971 | } |
972 | return NOTIFY_DONE; | |
973 | } | |
974 | ||
975 | static struct notifier_block nfqnl_rtnl_notifier = { | |
976 | .notifier_call = nfqnl_rcv_nl_event, | |
977 | }; | |
978 | ||
8d45ff22 SB |
979 | static const struct nla_policy nfqa_vlan_policy[NFQA_VLAN_MAX + 1] = { |
980 | [NFQA_VLAN_TCI] = { .type = NLA_U16}, | |
981 | [NFQA_VLAN_PROTO] = { .type = NLA_U16}, | |
982 | }; | |
983 | ||
5bf75853 PM |
984 | static const struct nla_policy nfqa_verdict_policy[NFQA_MAX+1] = { |
985 | [NFQA_VERDICT_HDR] = { .len = sizeof(struct nfqnl_msg_verdict_hdr) }, | |
986 | [NFQA_MARK] = { .type = NLA_U32 }, | |
987 | [NFQA_PAYLOAD] = { .type = NLA_UNSPEC }, | |
9cb01766 | 988 | [NFQA_CT] = { .type = NLA_UNSPEC }, |
bd077937 | 989 | [NFQA_EXP] = { .type = NLA_UNSPEC }, |
8d45ff22 | 990 | [NFQA_VLAN] = { .type = NLA_NESTED }, |
838ab636 HW |
991 | }; |
992 | ||
97d32cf9 FW |
993 | static const struct nla_policy nfqa_verdict_batch_policy[NFQA_MAX+1] = { |
994 | [NFQA_VERDICT_HDR] = { .len = sizeof(struct nfqnl_msg_verdict_hdr) }, | |
995 | [NFQA_MARK] = { .type = NLA_U32 }, | |
996 | }; | |
997 | ||
e8179610 | 998 | static struct nfqnl_instance * |
cc6bc448 | 999 | verdict_instance_lookup(struct nfnl_queue_net *q, u16 queue_num, u32 nlportid) |
97d32cf9 FW |
1000 | { |
1001 | struct nfqnl_instance *queue; | |
1002 | ||
e8179610 | 1003 | queue = instance_lookup(q, queue_num); |
97d32cf9 FW |
1004 | if (!queue) |
1005 | return ERR_PTR(-ENODEV); | |
1006 | ||
15e47304 | 1007 | if (queue->peer_portid != nlportid) |
97d32cf9 FW |
1008 | return ERR_PTR(-EPERM); |
1009 | ||
1010 | return queue; | |
1011 | } | |
1012 | ||
1013 | static struct nfqnl_msg_verdict_hdr* | |
1014 | verdicthdr_get(const struct nlattr * const nfqa[]) | |
1015 | { | |
1016 | struct nfqnl_msg_verdict_hdr *vhdr; | |
1017 | unsigned int verdict; | |
1018 | ||
1019 | if (!nfqa[NFQA_VERDICT_HDR]) | |
1020 | return NULL; | |
1021 | ||
1022 | vhdr = nla_data(nfqa[NFQA_VERDICT_HDR]); | |
c6675233 FW |
1023 | verdict = ntohl(vhdr->verdict) & NF_VERDICT_MASK; |
1024 | if (verdict > NF_MAX_VERDICT || verdict == NF_STOLEN) | |
97d32cf9 FW |
1025 | return NULL; |
1026 | return vhdr; | |
1027 | } | |
1028 | ||
1029 | static int nfq_id_after(unsigned int id, unsigned int max) | |
1030 | { | |
1031 | return (int)(id - max) > 0; | |
1032 | } | |
1033 | ||
7b8002a1 PNA |
1034 | static int nfqnl_recv_verdict_batch(struct net *net, struct sock *ctnl, |
1035 | struct sk_buff *skb, | |
1036 | const struct nlmsghdr *nlh, | |
1037 | const struct nlattr * const nfqa[]) | |
97d32cf9 | 1038 | { |
3da07c0c | 1039 | struct nfgenmsg *nfmsg = nlmsg_data(nlh); |
97d32cf9 FW |
1040 | struct nf_queue_entry *entry, *tmp; |
1041 | unsigned int verdict, maxid; | |
1042 | struct nfqnl_msg_verdict_hdr *vhdr; | |
1043 | struct nfqnl_instance *queue; | |
1044 | LIST_HEAD(batch_list); | |
1045 | u16 queue_num = ntohs(nfmsg->res_id); | |
e8179610 G |
1046 | struct nfnl_queue_net *q = nfnl_queue_pernet(net); |
1047 | ||
1048 | queue = verdict_instance_lookup(q, queue_num, | |
1049 | NETLINK_CB(skb).portid); | |
97d32cf9 FW |
1050 | if (IS_ERR(queue)) |
1051 | return PTR_ERR(queue); | |
1052 | ||
1053 | vhdr = verdicthdr_get(nfqa); | |
1054 | if (!vhdr) | |
1055 | return -EINVAL; | |
1056 | ||
1057 | verdict = ntohl(vhdr->verdict); | |
1058 | maxid = ntohl(vhdr->id); | |
1059 | ||
1060 | spin_lock_bh(&queue->lock); | |
1061 | ||
1062 | list_for_each_entry_safe(entry, tmp, &queue->queue_list, list) { | |
1063 | if (nfq_id_after(entry->id, maxid)) | |
1064 | break; | |
1065 | __dequeue_entry(queue, entry); | |
1066 | list_add_tail(&entry->list, &batch_list); | |
1067 | } | |
1068 | ||
1069 | spin_unlock_bh(&queue->lock); | |
1070 | ||
1071 | if (list_empty(&batch_list)) | |
1072 | return -ENOENT; | |
1073 | ||
1074 | list_for_each_entry_safe(entry, tmp, &batch_list, list) { | |
1075 | if (nfqa[NFQA_MARK]) | |
1076 | entry->skb->mark = ntohl(nla_get_be32(nfqa[NFQA_MARK])); | |
1077 | nf_reinject(entry, verdict); | |
1078 | } | |
1079 | return 0; | |
1080 | } | |
1081 | ||
a4b4766c | 1082 | static struct nf_conn *nfqnl_ct_parse(struct nfnl_ct_hook *nfnl_ct, |
b7bd1809 PNA |
1083 | const struct nlmsghdr *nlh, |
1084 | const struct nlattr * const nfqa[], | |
1085 | struct nf_queue_entry *entry, | |
1086 | enum ip_conntrack_info *ctinfo) | |
1087 | { | |
1088 | struct nf_conn *ct; | |
1089 | ||
a4b4766c | 1090 | ct = nfnl_ct->get_ct(entry->skb, ctinfo); |
b7bd1809 PNA |
1091 | if (ct == NULL) |
1092 | return NULL; | |
1093 | ||
a4b4766c | 1094 | if (nfnl_ct->parse(nfqa[NFQA_CT], ct) < 0) |
b7bd1809 PNA |
1095 | return NULL; |
1096 | ||
1097 | if (nfqa[NFQA_EXP]) | |
a4b4766c | 1098 | nfnl_ct->attach_expect(nfqa[NFQA_EXP], ct, |
b7bd1809 PNA |
1099 | NETLINK_CB(entry->skb).portid, |
1100 | nlmsg_report(nlh)); | |
1101 | return ct; | |
1102 | } | |
1103 | ||
8d45ff22 SB |
1104 | static int nfqa_parse_bridge(struct nf_queue_entry *entry, |
1105 | const struct nlattr * const nfqa[]) | |
1106 | { | |
1107 | if (nfqa[NFQA_VLAN]) { | |
1108 | struct nlattr *tb[NFQA_VLAN_MAX + 1]; | |
1109 | int err; | |
1110 | ||
1111 | err = nla_parse_nested(tb, NFQA_VLAN_MAX, nfqa[NFQA_VLAN], | |
1112 | nfqa_vlan_policy); | |
1113 | if (err < 0) | |
1114 | return err; | |
1115 | ||
1116 | if (!tb[NFQA_VLAN_TCI] || !tb[NFQA_VLAN_PROTO]) | |
1117 | return -EINVAL; | |
1118 | ||
1119 | entry->skb->vlan_tci = ntohs(nla_get_be16(tb[NFQA_VLAN_TCI])); | |
1120 | entry->skb->vlan_proto = nla_get_be16(tb[NFQA_VLAN_PROTO]); | |
1121 | } | |
1122 | ||
1123 | if (nfqa[NFQA_L2HDR]) { | |
1124 | int mac_header_len = entry->skb->network_header - | |
1125 | entry->skb->mac_header; | |
1126 | ||
1127 | if (mac_header_len != nla_len(nfqa[NFQA_L2HDR])) | |
1128 | return -EINVAL; | |
1129 | else if (mac_header_len > 0) | |
1130 | memcpy(skb_mac_header(entry->skb), | |
1131 | nla_data(nfqa[NFQA_L2HDR]), | |
1132 | mac_header_len); | |
1133 | } | |
1134 | ||
1135 | return 0; | |
1136 | } | |
1137 | ||
7b8002a1 PNA |
1138 | static int nfqnl_recv_verdict(struct net *net, struct sock *ctnl, |
1139 | struct sk_buff *skb, | |
1140 | const struct nlmsghdr *nlh, | |
1141 | const struct nlattr * const nfqa[]) | |
7af4cc3f | 1142 | { |
3da07c0c | 1143 | struct nfgenmsg *nfmsg = nlmsg_data(nlh); |
7af4cc3f | 1144 | u_int16_t queue_num = ntohs(nfmsg->res_id); |
7af4cc3f HW |
1145 | struct nfqnl_msg_verdict_hdr *vhdr; |
1146 | struct nfqnl_instance *queue; | |
1147 | unsigned int verdict; | |
02f014d8 | 1148 | struct nf_queue_entry *entry; |
8c88f87c | 1149 | enum ip_conntrack_info uninitialized_var(ctinfo); |
a4b4766c | 1150 | struct nfnl_ct_hook *nfnl_ct; |
8c88f87c | 1151 | struct nf_conn *ct = NULL; |
e8179610 | 1152 | struct nfnl_queue_net *q = nfnl_queue_pernet(net); |
8d45ff22 | 1153 | int err; |
7af4cc3f | 1154 | |
00a3101f LZ |
1155 | queue = verdict_instance_lookup(q, queue_num, |
1156 | NETLINK_CB(skb).portid); | |
97d32cf9 FW |
1157 | if (IS_ERR(queue)) |
1158 | return PTR_ERR(queue); | |
7af4cc3f | 1159 | |
97d32cf9 FW |
1160 | vhdr = verdicthdr_get(nfqa); |
1161 | if (!vhdr) | |
84a797dd | 1162 | return -EINVAL; |
7af4cc3f | 1163 | |
7af4cc3f HW |
1164 | verdict = ntohl(vhdr->verdict); |
1165 | ||
b43d8d85 | 1166 | entry = find_dequeue_entry(queue, ntohl(vhdr->id)); |
84a797dd ED |
1167 | if (entry == NULL) |
1168 | return -ENOENT; | |
7af4cc3f | 1169 | |
8e662164 AB |
1170 | /* rcu lock already held from nfnl->call_rcu. */ |
1171 | nfnl_ct = rcu_dereference(nfnl_ct_hook); | |
1172 | ||
bd077937 | 1173 | if (nfqa[NFQA_CT]) { |
a4b4766c KM |
1174 | if (nfnl_ct != NULL) |
1175 | ct = nfqnl_ct_parse(nfnl_ct, nlh, nfqa, entry, &ctinfo); | |
bd077937 | 1176 | } |
9cb01766 | 1177 | |
8d45ff22 SB |
1178 | if (entry->state.pf == PF_BRIDGE) { |
1179 | err = nfqa_parse_bridge(entry, nfqa); | |
1180 | if (err < 0) | |
1181 | return err; | |
1182 | } | |
1183 | ||
df6fb868 | 1184 | if (nfqa[NFQA_PAYLOAD]) { |
8c88f87c PNA |
1185 | u16 payload_len = nla_len(nfqa[NFQA_PAYLOAD]); |
1186 | int diff = payload_len - entry->skb->len; | |
1187 | ||
df6fb868 | 1188 | if (nfqnl_mangle(nla_data(nfqa[NFQA_PAYLOAD]), |
8c88f87c | 1189 | payload_len, entry, diff) < 0) |
7af4cc3f | 1190 | verdict = NF_DROP; |
8c88f87c | 1191 | |
b7bd1809 | 1192 | if (ct && diff) |
a4b4766c | 1193 | nfnl_ct->seq_adjust(entry->skb, ct, ctinfo, diff); |
7af4cc3f HW |
1194 | } |
1195 | ||
df6fb868 | 1196 | if (nfqa[NFQA_MARK]) |
ea3a66ff | 1197 | entry->skb->mark = ntohl(nla_get_be32(nfqa[NFQA_MARK])); |
601e68e1 | 1198 | |
4b3d15ef | 1199 | nf_reinject(entry, verdict); |
7af4cc3f HW |
1200 | return 0; |
1201 | } | |
1202 | ||
7b8002a1 PNA |
1203 | static int nfqnl_recv_unsupp(struct net *net, struct sock *ctnl, |
1204 | struct sk_buff *skb, const struct nlmsghdr *nlh, | |
1205 | const struct nlattr * const nfqa[]) | |
7af4cc3f HW |
1206 | { |
1207 | return -ENOTSUPP; | |
1208 | } | |
1209 | ||
5bf75853 PM |
1210 | static const struct nla_policy nfqa_cfg_policy[NFQA_CFG_MAX+1] = { |
1211 | [NFQA_CFG_CMD] = { .len = sizeof(struct nfqnl_msg_config_cmd) }, | |
1212 | [NFQA_CFG_PARAMS] = { .len = sizeof(struct nfqnl_msg_config_params) }, | |
838ab636 HW |
1213 | }; |
1214 | ||
e3ac5298 | 1215 | static const struct nf_queue_handler nfqh = { |
d4ef3835 AS |
1216 | .outfn = nfqnl_enqueue_packet, |
1217 | .nf_hook_drop = nfqnl_nf_hook_drop, | |
bbd86b9f HW |
1218 | }; |
1219 | ||
7b8002a1 PNA |
1220 | static int nfqnl_recv_config(struct net *net, struct sock *ctnl, |
1221 | struct sk_buff *skb, const struct nlmsghdr *nlh, | |
1222 | const struct nlattr * const nfqa[]) | |
7af4cc3f | 1223 | { |
3da07c0c | 1224 | struct nfgenmsg *nfmsg = nlmsg_data(nlh); |
7af4cc3f HW |
1225 | u_int16_t queue_num = ntohs(nfmsg->res_id); |
1226 | struct nfqnl_instance *queue; | |
9872bec7 | 1227 | struct nfqnl_msg_config_cmd *cmd = NULL; |
e8179610 | 1228 | struct nfnl_queue_net *q = nfnl_queue_pernet(net); |
60d2c7f9 | 1229 | __u32 flags = 0, mask = 0; |
838ab636 | 1230 | int ret = 0; |
7af4cc3f | 1231 | |
9872bec7 PM |
1232 | if (nfqa[NFQA_CFG_CMD]) { |
1233 | cmd = nla_data(nfqa[NFQA_CFG_CMD]); | |
1234 | ||
0360ae41 | 1235 | /* Obsolete commands without queue context */ |
9872bec7 | 1236 | switch (cmd->command) { |
0360ae41 FW |
1237 | case NFQNL_CFG_CMD_PF_BIND: return 0; |
1238 | case NFQNL_CFG_CMD_PF_UNBIND: return 0; | |
9872bec7 | 1239 | } |
9872bec7 PM |
1240 | } |
1241 | ||
60d2c7f9 KM |
1242 | /* Check if we support these flags in first place, dependencies should |
1243 | * be there too not to break atomicity. | |
1244 | */ | |
1245 | if (nfqa[NFQA_CFG_FLAGS]) { | |
1246 | if (!nfqa[NFQA_CFG_MASK]) { | |
1247 | /* A mask is needed to specify which flags are being | |
1248 | * changed. | |
1249 | */ | |
1250 | return -EINVAL; | |
1251 | } | |
1252 | ||
1253 | flags = ntohl(nla_get_be32(nfqa[NFQA_CFG_FLAGS])); | |
1254 | mask = ntohl(nla_get_be32(nfqa[NFQA_CFG_MASK])); | |
1255 | ||
1256 | if (flags >= NFQA_CFG_F_MAX) | |
1257 | return -EOPNOTSUPP; | |
1258 | ||
1259 | #if !IS_ENABLED(CONFIG_NETWORK_SECMARK) | |
1260 | if (flags & mask & NFQA_CFG_F_SECCTX) | |
1261 | return -EOPNOTSUPP; | |
1262 | #endif | |
71b2e5f5 KM |
1263 | if ((flags & mask & NFQA_CFG_F_CONNTRACK) && |
1264 | !rcu_access_pointer(nfnl_ct_hook)) { | |
1265 | #ifdef CONFIG_MODULES | |
1266 | nfnl_unlock(NFNL_SUBSYS_QUEUE); | |
1267 | request_module("ip_conntrack_netlink"); | |
1268 | nfnl_lock(NFNL_SUBSYS_QUEUE); | |
1269 | if (rcu_access_pointer(nfnl_ct_hook)) | |
1270 | return -EAGAIN; | |
1271 | #endif | |
1272 | return -EOPNOTSUPP; | |
1273 | } | |
60d2c7f9 KM |
1274 | } |
1275 | ||
9872bec7 | 1276 | rcu_read_lock(); |
e8179610 | 1277 | queue = instance_lookup(q, queue_num); |
15e47304 | 1278 | if (queue && queue->peer_portid != NETLINK_CB(skb).portid) { |
a3c8e7fd | 1279 | ret = -EPERM; |
9872bec7 | 1280 | goto err_out_unlock; |
a3c8e7fd PM |
1281 | } |
1282 | ||
9872bec7 | 1283 | if (cmd != NULL) { |
7af4cc3f HW |
1284 | switch (cmd->command) { |
1285 | case NFQNL_CFG_CMD_BIND: | |
9872bec7 PM |
1286 | if (queue) { |
1287 | ret = -EBUSY; | |
1288 | goto err_out_unlock; | |
1289 | } | |
e8179610 G |
1290 | queue = instance_create(q, queue_num, |
1291 | NETLINK_CB(skb).portid); | |
baab2ce7 PM |
1292 | if (IS_ERR(queue)) { |
1293 | ret = PTR_ERR(queue); | |
9872bec7 PM |
1294 | goto err_out_unlock; |
1295 | } | |
7af4cc3f HW |
1296 | break; |
1297 | case NFQNL_CFG_CMD_UNBIND: | |
9872bec7 PM |
1298 | if (!queue) { |
1299 | ret = -ENODEV; | |
1300 | goto err_out_unlock; | |
1301 | } | |
e8179610 | 1302 | instance_destroy(q, queue); |
17bc6b48 | 1303 | goto err_out_unlock; |
7af4cc3f | 1304 | case NFQNL_CFG_CMD_PF_BIND: |
7af4cc3f | 1305 | case NFQNL_CFG_CMD_PF_UNBIND: |
7af4cc3f HW |
1306 | break; |
1307 | default: | |
cd21f0ac | 1308 | ret = -ENOTSUPP; |
21c3c971 | 1309 | goto err_out_unlock; |
7af4cc3f | 1310 | } |
7af4cc3f HW |
1311 | } |
1312 | ||
60d2c7f9 KM |
1313 | if (!queue) { |
1314 | ret = -ENODEV; | |
1315 | goto err_out_unlock; | |
1316 | } | |
1317 | ||
df6fb868 | 1318 | if (nfqa[NFQA_CFG_PARAMS]) { |
60d2c7f9 KM |
1319 | struct nfqnl_msg_config_params *params = |
1320 | nla_data(nfqa[NFQA_CFG_PARAMS]); | |
7af4cc3f HW |
1321 | |
1322 | nfqnl_set_mode(queue, params->copy_mode, | |
1323 | ntohl(params->copy_range)); | |
1324 | } | |
1325 | ||
df6fb868 | 1326 | if (nfqa[NFQA_CFG_QUEUE_MAXLEN]) { |
60d2c7f9 | 1327 | __be32 *queue_maxlen = nla_data(nfqa[NFQA_CFG_QUEUE_MAXLEN]); |
a3c8e7fd | 1328 | |
829e17a1 EL |
1329 | spin_lock_bh(&queue->lock); |
1330 | queue->queue_maxlen = ntohl(*queue_maxlen); | |
1331 | spin_unlock_bh(&queue->lock); | |
1332 | } | |
1333 | ||
fdb694a0 | 1334 | if (nfqa[NFQA_CFG_FLAGS]) { |
fdb694a0 KK |
1335 | spin_lock_bh(&queue->lock); |
1336 | queue->flags &= ~mask; | |
1337 | queue->flags |= flags & mask; | |
1338 | spin_unlock_bh(&queue->lock); | |
1339 | } | |
1340 | ||
9872bec7 PM |
1341 | err_out_unlock: |
1342 | rcu_read_unlock(); | |
838ab636 | 1343 | return ret; |
7af4cc3f HW |
1344 | } |
1345 | ||
7c8d4cb4 | 1346 | static const struct nfnl_callback nfqnl_cb[NFQNL_MSG_MAX] = { |
84a797dd | 1347 | [NFQNL_MSG_PACKET] = { .call_rcu = nfqnl_recv_unsupp, |
37d2e7a2 | 1348 | .attr_count = NFQA_MAX, }, |
84a797dd | 1349 | [NFQNL_MSG_VERDICT] = { .call_rcu = nfqnl_recv_verdict, |
5bf75853 PM |
1350 | .attr_count = NFQA_MAX, |
1351 | .policy = nfqa_verdict_policy }, | |
7af4cc3f | 1352 | [NFQNL_MSG_CONFIG] = { .call = nfqnl_recv_config, |
5bf75853 PM |
1353 | .attr_count = NFQA_CFG_MAX, |
1354 | .policy = nfqa_cfg_policy }, | |
97d32cf9 FW |
1355 | [NFQNL_MSG_VERDICT_BATCH]={ .call_rcu = nfqnl_recv_verdict_batch, |
1356 | .attr_count = NFQA_MAX, | |
1357 | .policy = nfqa_verdict_batch_policy }, | |
7af4cc3f HW |
1358 | }; |
1359 | ||
7c8d4cb4 | 1360 | static const struct nfnetlink_subsystem nfqnl_subsys = { |
7af4cc3f HW |
1361 | .name = "nf_queue", |
1362 | .subsys_id = NFNL_SUBSYS_QUEUE, | |
1363 | .cb_count = NFQNL_MSG_MAX, | |
7af4cc3f HW |
1364 | .cb = nfqnl_cb, |
1365 | }; | |
1366 | ||
838ab636 HW |
1367 | #ifdef CONFIG_PROC_FS |
1368 | struct iter_state { | |
e8179610 | 1369 | struct seq_net_private p; |
838ab636 HW |
1370 | unsigned int bucket; |
1371 | }; | |
1372 | ||
1373 | static struct hlist_node *get_first(struct seq_file *seq) | |
1374 | { | |
1375 | struct iter_state *st = seq->private; | |
e8179610 G |
1376 | struct net *net; |
1377 | struct nfnl_queue_net *q; | |
838ab636 HW |
1378 | |
1379 | if (!st) | |
1380 | return NULL; | |
1381 | ||
e8179610 G |
1382 | net = seq_file_net(seq); |
1383 | q = nfnl_queue_pernet(net); | |
838ab636 | 1384 | for (st->bucket = 0; st->bucket < INSTANCE_BUCKETS; st->bucket++) { |
e8179610 G |
1385 | if (!hlist_empty(&q->instance_table[st->bucket])) |
1386 | return q->instance_table[st->bucket].first; | |
838ab636 HW |
1387 | } |
1388 | return NULL; | |
1389 | } | |
1390 | ||
1391 | static struct hlist_node *get_next(struct seq_file *seq, struct hlist_node *h) | |
1392 | { | |
1393 | struct iter_state *st = seq->private; | |
e8179610 | 1394 | struct net *net = seq_file_net(seq); |
838ab636 HW |
1395 | |
1396 | h = h->next; | |
1397 | while (!h) { | |
e8179610 G |
1398 | struct nfnl_queue_net *q; |
1399 | ||
838ab636 HW |
1400 | if (++st->bucket >= INSTANCE_BUCKETS) |
1401 | return NULL; | |
1402 | ||
e8179610 G |
1403 | q = nfnl_queue_pernet(net); |
1404 | h = q->instance_table[st->bucket].first; | |
838ab636 HW |
1405 | } |
1406 | return h; | |
1407 | } | |
1408 | ||
1409 | static struct hlist_node *get_idx(struct seq_file *seq, loff_t pos) | |
1410 | { | |
1411 | struct hlist_node *head; | |
1412 | head = get_first(seq); | |
1413 | ||
1414 | if (head) | |
1415 | while (pos && (head = get_next(seq, head))) | |
1416 | pos--; | |
1417 | return pos ? NULL : head; | |
1418 | } | |
1419 | ||
e8179610 G |
1420 | static void *seq_start(struct seq_file *s, loff_t *pos) |
1421 | __acquires(nfnl_queue_pernet(seq_file_net(s))->instances_lock) | |
838ab636 | 1422 | { |
e8179610 G |
1423 | spin_lock(&nfnl_queue_pernet(seq_file_net(s))->instances_lock); |
1424 | return get_idx(s, *pos); | |
838ab636 HW |
1425 | } |
1426 | ||
1427 | static void *seq_next(struct seq_file *s, void *v, loff_t *pos) | |
1428 | { | |
1429 | (*pos)++; | |
1430 | return get_next(s, v); | |
1431 | } | |
1432 | ||
1433 | static void seq_stop(struct seq_file *s, void *v) | |
e8179610 | 1434 | __releases(nfnl_queue_pernet(seq_file_net(s))->instances_lock) |
838ab636 | 1435 | { |
e8179610 | 1436 | spin_unlock(&nfnl_queue_pernet(seq_file_net(s))->instances_lock); |
838ab636 HW |
1437 | } |
1438 | ||
1439 | static int seq_show(struct seq_file *s, void *v) | |
1440 | { | |
1441 | const struct nfqnl_instance *inst = v; | |
1442 | ||
6b46f7b7 | 1443 | seq_printf(s, "%5u %6u %5u %1u %5u %5u %5u %8u %2d\n", |
e71456ae SRRH |
1444 | inst->queue_num, |
1445 | inst->peer_portid, inst->queue_total, | |
1446 | inst->copy_mode, inst->copy_range, | |
1447 | inst->queue_dropped, inst->queue_user_dropped, | |
1448 | inst->id_sequence, 1); | |
861fb107 | 1449 | return 0; |
838ab636 HW |
1450 | } |
1451 | ||
56b3d975 | 1452 | static const struct seq_operations nfqnl_seq_ops = { |
838ab636 HW |
1453 | .start = seq_start, |
1454 | .next = seq_next, | |
1455 | .stop = seq_stop, | |
1456 | .show = seq_show, | |
1457 | }; | |
1458 | ||
1459 | static int nfqnl_open(struct inode *inode, struct file *file) | |
1460 | { | |
e8179610 | 1461 | return seq_open_net(inode, file, &nfqnl_seq_ops, |
e2da5913 | 1462 | sizeof(struct iter_state)); |
838ab636 HW |
1463 | } |
1464 | ||
da7071d7 | 1465 | static const struct file_operations nfqnl_file_ops = { |
838ab636 HW |
1466 | .owner = THIS_MODULE, |
1467 | .open = nfqnl_open, | |
1468 | .read = seq_read, | |
1469 | .llseek = seq_lseek, | |
e8179610 | 1470 | .release = seq_release_net, |
838ab636 HW |
1471 | }; |
1472 | ||
1473 | #endif /* PROC_FS */ | |
1474 | ||
e8179610 | 1475 | static int __net_init nfnl_queue_net_init(struct net *net) |
7af4cc3f | 1476 | { |
e8179610 G |
1477 | unsigned int i; |
1478 | struct nfnl_queue_net *q = nfnl_queue_pernet(net); | |
601e68e1 | 1479 | |
838ab636 | 1480 | for (i = 0; i < INSTANCE_BUCKETS; i++) |
e8179610 G |
1481 | INIT_HLIST_HEAD(&q->instance_table[i]); |
1482 | ||
1483 | spin_lock_init(&q->instances_lock); | |
1484 | ||
1485 | #ifdef CONFIG_PROC_FS | |
1486 | if (!proc_create("nfnetlink_queue", 0440, | |
1487 | net->nf.proc_netfilter, &nfqnl_file_ops)) | |
1488 | return -ENOMEM; | |
1489 | #endif | |
dc3ee32e | 1490 | nf_register_queue_handler(net, &nfqh); |
e8179610 G |
1491 | return 0; |
1492 | } | |
1493 | ||
1494 | static void __net_exit nfnl_queue_net_exit(struct net *net) | |
1495 | { | |
dc3ee32e | 1496 | nf_unregister_queue_handler(net); |
e778f56e | 1497 | #ifdef CONFIG_PROC_FS |
e8179610 | 1498 | remove_proc_entry("nfnetlink_queue", net->nf.proc_netfilter); |
e778f56e | 1499 | #endif |
e8179610 G |
1500 | } |
1501 | ||
dc3ee32e EB |
1502 | static void nfnl_queue_net_exit_batch(struct list_head *net_exit_list) |
1503 | { | |
1504 | synchronize_rcu(); | |
1505 | } | |
1506 | ||
e8179610 | 1507 | static struct pernet_operations nfnl_queue_net_ops = { |
dc3ee32e EB |
1508 | .init = nfnl_queue_net_init, |
1509 | .exit = nfnl_queue_net_exit, | |
1510 | .exit_batch = nfnl_queue_net_exit_batch, | |
1511 | .id = &nfnl_queue_net_id, | |
1512 | .size = sizeof(struct nfnl_queue_net), | |
e8179610 G |
1513 | }; |
1514 | ||
1515 | static int __init nfnetlink_queue_init(void) | |
1516 | { | |
3bfe0498 FR |
1517 | int status; |
1518 | ||
1519 | status = register_pernet_subsys(&nfnl_queue_net_ops); | |
1520 | if (status < 0) { | |
1521 | pr_err("nf_queue: failed to register pernet ops\n"); | |
1522 | goto out; | |
1523 | } | |
838ab636 | 1524 | |
7af4cc3f HW |
1525 | netlink_register_notifier(&nfqnl_rtnl_notifier); |
1526 | status = nfnetlink_subsys_register(&nfqnl_subsys); | |
1527 | if (status < 0) { | |
e8179610 | 1528 | pr_err("nf_queue: failed to create netlink socket\n"); |
7af4cc3f HW |
1529 | goto cleanup_netlink_notifier; |
1530 | } | |
1531 | ||
4e6577de GF |
1532 | status = register_netdevice_notifier(&nfqnl_dev_notifier); |
1533 | if (status < 0) { | |
1534 | pr_err("nf_queue: failed to register netdevice notifier\n"); | |
1535 | goto cleanup_netlink_subsys; | |
1536 | } | |
1537 | ||
7af4cc3f HW |
1538 | return status; |
1539 | ||
4e6577de GF |
1540 | cleanup_netlink_subsys: |
1541 | nfnetlink_subsys_unregister(&nfqnl_subsys); | |
7af4cc3f HW |
1542 | cleanup_netlink_notifier: |
1543 | netlink_unregister_notifier(&nfqnl_rtnl_notifier); | |
639e077b | 1544 | unregister_pernet_subsys(&nfnl_queue_net_ops); |
3bfe0498 | 1545 | out: |
7af4cc3f HW |
1546 | return status; |
1547 | } | |
1548 | ||
65b4b4e8 | 1549 | static void __exit nfnetlink_queue_fini(void) |
7af4cc3f | 1550 | { |
32292a7f | 1551 | unregister_netdevice_notifier(&nfqnl_dev_notifier); |
32292a7f PM |
1552 | nfnetlink_subsys_unregister(&nfqnl_subsys); |
1553 | netlink_unregister_notifier(&nfqnl_rtnl_notifier); | |
3bfe0498 | 1554 | unregister_pernet_subsys(&nfnl_queue_net_ops); |
67137f3c JDB |
1555 | |
1556 | rcu_barrier(); /* Wait for completion of call_rcu()'s */ | |
7af4cc3f HW |
1557 | } |
1558 | ||
1559 | MODULE_DESCRIPTION("netfilter packet queue handler"); | |
1560 | MODULE_AUTHOR("Harald Welte <laforge@netfilter.org>"); | |
1561 | MODULE_LICENSE("GPL"); | |
1562 | MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_QUEUE); | |
1563 | ||
65b4b4e8 AM |
1564 | module_init(nfnetlink_queue_init); |
1565 | module_exit(nfnetlink_queue_fini); |