1 | // SPDX-License-Identifier: GPL-2.0-only |
2 | /* |
3 | * This is a module which is used for queueing packets and communicating with |
4 | * userspace via nfnetlink. |
5 | * |
6 | * (C) 2005 by Harald Welte <laforge@netfilter.org> |
7 | * (C) 2007 by Patrick McHardy <kaber@trash.net> |
8 | * |
9 | * Based on the old ipv4-only ip_queue.c: |
10 | * (C) 2000-2002 James Morris <jmorris@intercode.com.au> |
11 | * (C) 2003-2005 Netfilter Core Team <coreteam@netfilter.org> |
12 | */ |
13 | |
14 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
15 | |
16 | #include <linux/module.h> |
17 | #include <linux/skbuff.h> |
18 | #include <linux/init.h> |
19 | #include <linux/spinlock.h> |
20 | #include <linux/slab.h> |
21 | #include <linux/notifier.h> |
22 | #include <linux/netdevice.h> |
23 | #include <linux/netfilter.h> |
24 | #include <linux/proc_fs.h> |
25 | #include <linux/netfilter_ipv4.h> |
26 | #include <linux/netfilter_ipv6.h> |
27 | #include <linux/netfilter_bridge.h> |
28 | #include <linux/netfilter/nfnetlink.h> |
29 | #include <linux/netfilter/nfnetlink_queue.h> |
30 | #include <linux/netfilter/nf_conntrack_common.h> |
31 | #include <linux/list.h> |
32 | #include <linux/cgroup-defs.h> |
33 | #include <net/gso.h> |
34 | #include <net/sock.h> |
35 | #include <net/tcp_states.h> |
36 | #include <net/netfilter/nf_queue.h> |
37 | #include <net/netns/generic.h> |
38 | |
39 | #include <linux/atomic.h> |
40 | |
41 | #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER) |
42 | #include "../bridge/br_private.h" |
43 | #endif |
44 | |
45 | #if IS_ENABLED(CONFIG_NF_CONNTRACK) |
46 | #include <net/netfilter/nf_conntrack.h> |
47 | #endif |
48 | |
49 | #define NFQNL_QMAX_DEFAULT 1024 |
50 | |
51 | /* We're using struct nlattr which has 16bit nla_len. Note that nla_len |
52 | * includes the header length. Thus, the maximum packet length that we |
53 | * support is 65531 bytes. We send truncated packets if the specified length |
54 | * is larger than that. Userspace can check for presence of NFQA_CAP_LEN |
55 | * attribute to detect truncation. |
56 | */ |
57 | #define NFQNL_MAX_COPY_RANGE (0xffff - NLA_HDRLEN) |
58 | |
59 | struct nfqnl_instance { |
60 | struct hlist_node hlist; /* global list of queues */ |
61 | struct rcu_head rcu; |
62 | |
63 | u32 peer_portid; |
64 | unsigned int queue_maxlen; |
65 | unsigned int copy_range; |
66 | unsigned int queue_dropped; |
67 | unsigned int queue_user_dropped; |
68 | |
69 | |
70 | u_int16_t queue_num; /* number of this queue */ |
71 | u_int8_t copy_mode; |
72 | u_int32_t flags; /* Set using NFQA_CFG_FLAGS */ |
73 | /* |
74 | * Following fields are dirtied for each queued packet, |
75 | * keep them in same cache line if possible. |
76 | */ |
77 | spinlock_t lock ____cacheline_aligned_in_smp; |
78 | unsigned int queue_total; |
79 | unsigned int id_sequence; /* 'sequence' of pkt ids */ |
80 | struct list_head queue_list; /* packets in queue */ |
81 | }; |
82 | |
83 | typedef int (*nfqnl_cmpfn)(struct nf_queue_entry *, unsigned long); |
84 | |
85 | static unsigned int nfnl_queue_net_id __read_mostly; |
86 | |
87 | #define INSTANCE_BUCKETS 16 |
88 | struct nfnl_queue_net { |
89 | spinlock_t instances_lock; |
90 | struct hlist_head instance_table[INSTANCE_BUCKETS]; |
91 | }; |
92 | |
93 | static struct nfnl_queue_net *nfnl_queue_pernet(struct net *net) |
94 | { |
95 | return net_generic(net, id: nfnl_queue_net_id); |
96 | } |
97 | |
98 | static inline u_int8_t instance_hashfn(u_int16_t queue_num) |
99 | { |
100 | return ((queue_num >> 8) ^ queue_num) % INSTANCE_BUCKETS; |
101 | } |
102 | |
103 | static struct nfqnl_instance * |
104 | instance_lookup(struct nfnl_queue_net *q, u_int16_t queue_num) |
105 | { |
106 | struct hlist_head *head; |
107 | struct nfqnl_instance *inst; |
108 | |
109 | head = &q->instance_table[instance_hashfn(queue_num)]; |
110 | hlist_for_each_entry_rcu(inst, head, hlist) { |
111 | if (inst->queue_num == queue_num) |
112 | return inst; |
113 | } |
114 | return NULL; |
115 | } |
116 | |
117 | static struct nfqnl_instance * |
118 | instance_create(struct nfnl_queue_net *q, u_int16_t queue_num, u32 portid) |
119 | { |
120 | struct nfqnl_instance *inst; |
121 | unsigned int h; |
122 | int err; |
123 | |
124 | spin_lock(lock: &q->instances_lock); |
125 | if (instance_lookup(q, queue_num)) { |
126 | err = -EEXIST; |
127 | goto out_unlock; |
128 | } |
129 | |
130 | inst = kzalloc(size: sizeof(*inst), GFP_ATOMIC); |
131 | if (!inst) { |
132 | err = -ENOMEM; |
133 | goto out_unlock; |
134 | } |
135 | |
136 | inst->queue_num = queue_num; |
137 | inst->peer_portid = portid; |
138 | inst->queue_maxlen = NFQNL_QMAX_DEFAULT; |
139 | inst->copy_range = NFQNL_MAX_COPY_RANGE; |
140 | inst->copy_mode = NFQNL_COPY_NONE; |
141 | spin_lock_init(&inst->lock); |
142 | INIT_LIST_HEAD(list: &inst->queue_list); |
143 | |
144 | if (!try_module_get(THIS_MODULE)) { |
145 | err = -EAGAIN; |
146 | goto out_free; |
147 | } |
148 | |
149 | h = instance_hashfn(queue_num); |
150 | hlist_add_head_rcu(n: &inst->hlist, h: &q->instance_table[h]); |
151 | |
152 | spin_unlock(lock: &q->instances_lock); |
153 | |
154 | return inst; |
155 | |
156 | out_free: |
157 | kfree(objp: inst); |
158 | out_unlock: |
159 | spin_unlock(lock: &q->instances_lock); |
160 | return ERR_PTR(error: err); |
161 | } |
162 | |
163 | static void nfqnl_flush(struct nfqnl_instance *queue, nfqnl_cmpfn cmpfn, |
164 | unsigned long data); |
165 | |
166 | static void |
167 | instance_destroy_rcu(struct rcu_head *head) |
168 | { |
169 | struct nfqnl_instance *inst = container_of(head, struct nfqnl_instance, |
170 | rcu); |
171 | |
172 | nfqnl_flush(queue: inst, NULL, data: 0); |
173 | kfree(objp: inst); |
174 | module_put(THIS_MODULE); |
175 | } |
176 | |
177 | static void |
178 | __instance_destroy(struct nfqnl_instance *inst) |
179 | { |
180 | hlist_del_rcu(n: &inst->hlist); |
181 | call_rcu(head: &inst->rcu, func: instance_destroy_rcu); |
182 | } |
183 | |
184 | static void |
185 | instance_destroy(struct nfnl_queue_net *q, struct nfqnl_instance *inst) |
186 | { |
187 | spin_lock(lock: &q->instances_lock); |
188 | __instance_destroy(inst); |
189 | spin_unlock(lock: &q->instances_lock); |
190 | } |
191 | |
192 | static inline void |
193 | __enqueue_entry(struct nfqnl_instance *queue, struct nf_queue_entry *entry) |
194 | { |
195 | list_add_tail(new: &entry->list, head: &queue->queue_list); |
196 | queue->queue_total++; |
197 | } |
198 | |
199 | static void |
200 | __dequeue_entry(struct nfqnl_instance *queue, struct nf_queue_entry *entry) |
201 | { |
202 | list_del(entry: &entry->list); |
203 | queue->queue_total--; |
204 | } |
205 | |
206 | static struct nf_queue_entry * |
207 | find_dequeue_entry(struct nfqnl_instance *queue, unsigned int id) |
208 | { |
209 | struct nf_queue_entry *entry = NULL, *i; |
210 | |
211 | spin_lock_bh(lock: &queue->lock); |
212 | |
213 | list_for_each_entry(i, &queue->queue_list, list) { |
214 | if (i->id == id) { |
215 | entry = i; |
216 | break; |
217 | } |
218 | } |
219 | |
220 | if (entry) |
221 | __dequeue_entry(queue, entry); |
222 | |
223 | spin_unlock_bh(lock: &queue->lock); |
224 | |
225 | return entry; |
226 | } |
227 | |
228 | static unsigned int nf_iterate(struct sk_buff *skb, |
229 | struct nf_hook_state *state, |
230 | const struct nf_hook_entries *hooks, |
231 | unsigned int *index) |
232 | { |
233 | const struct nf_hook_entry *hook; |
234 | unsigned int verdict, i = *index; |
235 | |
236 | while (i < hooks->num_hook_entries) { |
237 | hook = &hooks->hooks[i]; |
238 | repeat: |
239 | verdict = nf_hook_entry_hookfn(entry: hook, skb, state); |
240 | if (verdict != NF_ACCEPT) { |
241 | *index = i; |
242 | if (verdict != NF_REPEAT) |
243 | return verdict; |
244 | goto repeat; |
245 | } |
246 | i++; |
247 | } |
248 | |
249 | *index = i; |
250 | return NF_ACCEPT; |
251 | } |
252 | |
253 | static struct nf_hook_entries *nf_hook_entries_head(const struct net *net, u8 pf, u8 hooknum) |
254 | { |
255 | switch (pf) { |
256 | #ifdef CONFIG_NETFILTER_FAMILY_BRIDGE |
257 | case NFPROTO_BRIDGE: |
258 | return rcu_dereference(net->nf.hooks_bridge[hooknum]); |
259 | #endif |
260 | case NFPROTO_IPV4: |
261 | return rcu_dereference(net->nf.hooks_ipv4[hooknum]); |
262 | case NFPROTO_IPV6: |
263 | return rcu_dereference(net->nf.hooks_ipv6[hooknum]); |
264 | default: |
265 | WARN_ON_ONCE(1); |
266 | return NULL; |
267 | } |
268 | |
269 | return NULL; |
270 | } |
271 | |
272 | static int nf_ip_reroute(struct sk_buff *skb, const struct nf_queue_entry *entry) |
273 | { |
274 | #ifdef CONFIG_INET |
275 | const struct ip_rt_info *rt_info = nf_queue_entry_reroute(entry); |
276 | |
277 | if (entry->state.hook == NF_INET_LOCAL_OUT) { |
278 | const struct iphdr *iph = ip_hdr(skb); |
279 | |
280 | if (!(iph->tos == rt_info->tos && |
281 | skb->mark == rt_info->mark && |
282 | iph->daddr == rt_info->daddr && |
283 | iph->saddr == rt_info->saddr)) |
284 | return ip_route_me_harder(net: entry->state.net, sk: entry->state.sk, |
285 | skb, addr_type: RTN_UNSPEC); |
286 | } |
287 | #endif |
288 | return 0; |
289 | } |
290 | |
291 | static int nf_reroute(struct sk_buff *skb, struct nf_queue_entry *entry) |
292 | { |
293 | const struct nf_ipv6_ops *v6ops; |
294 | int ret = 0; |
295 | |
296 | switch (entry->state.pf) { |
297 | case AF_INET: |
298 | ret = nf_ip_reroute(skb, entry); |
299 | break; |
300 | case AF_INET6: |
301 | v6ops = rcu_dereference(nf_ipv6_ops); |
302 | if (v6ops) |
303 | ret = v6ops->reroute(skb, entry); |
304 | break; |
305 | } |
306 | return ret; |
307 | } |
308 | |
309 | /* caller must hold rcu read-side lock */ |
310 | static void nf_reinject(struct nf_queue_entry *entry, unsigned int verdict) |
311 | { |
312 | const struct nf_hook_entry *hook_entry; |
313 | const struct nf_hook_entries *hooks; |
314 | struct sk_buff *skb = entry->skb; |
315 | const struct net *net; |
316 | unsigned int i; |
317 | int err; |
318 | u8 pf; |
319 | |
320 | net = entry->state.net; |
321 | pf = entry->state.pf; |
322 | |
323 | hooks = nf_hook_entries_head(net, pf, hooknum: entry->state.hook); |
324 | |
325 | i = entry->hook_index; |
326 | if (WARN_ON_ONCE(!hooks || i >= hooks->num_hook_entries)) { |
327 | kfree_skb_reason(skb, reason: SKB_DROP_REASON_NETFILTER_DROP); |
328 | nf_queue_entry_free(entry); |
329 | return; |
330 | } |
331 | |
332 | hook_entry = &hooks->hooks[i]; |
333 | |
334 | /* Continue traversal iff userspace said ok... */ |
335 | if (verdict == NF_REPEAT) |
336 | verdict = nf_hook_entry_hookfn(entry: hook_entry, skb, state: &entry->state); |
337 | |
338 | if (verdict == NF_ACCEPT) { |
339 | if (nf_reroute(skb, entry) < 0) |
340 | verdict = NF_DROP; |
341 | } |
342 | |
343 | if (verdict == NF_ACCEPT) { |
344 | next_hook: |
345 | ++i; |
346 | verdict = nf_iterate(skb, state: &entry->state, hooks, index: &i); |
347 | } |
348 | |
349 | switch (verdict & NF_VERDICT_MASK) { |
350 | case NF_ACCEPT: |
351 | case NF_STOP: |
352 | local_bh_disable(); |
353 | entry->state.okfn(entry->state.net, entry->state.sk, skb); |
354 | local_bh_enable(); |
355 | break; |
356 | case NF_QUEUE: |
357 | err = nf_queue(skb, state: &entry->state, index: i, verdict); |
358 | if (err == 1) |
359 | goto next_hook; |
360 | break; |
361 | case NF_STOLEN: |
362 | break; |
363 | default: |
364 | kfree_skb(skb); |
365 | } |
366 | |
367 | nf_queue_entry_free(entry); |
368 | } |
369 | |
370 | static void nfqnl_reinject(struct nf_queue_entry *entry, unsigned int verdict) |
371 | { |
372 | const struct nf_ct_hook *ct_hook; |
373 | |
374 | if (verdict == NF_ACCEPT || |
375 | verdict == NF_REPEAT || |
376 | verdict == NF_STOP) { |
377 | unsigned int ct_verdict = verdict; |
378 | |
379 | rcu_read_lock(); |
380 | ct_hook = rcu_dereference(nf_ct_hook); |
381 | if (ct_hook) |
382 | ct_verdict = ct_hook->update(entry->state.net, entry->skb); |
383 | rcu_read_unlock(); |
384 | |
385 | switch (ct_verdict & NF_VERDICT_MASK) { |
386 | case NF_ACCEPT: |
387 | /* follow userspace verdict, could be REPEAT */ |
388 | break; |
389 | case NF_STOLEN: |
390 | nf_queue_entry_free(entry); |
391 | return; |
392 | default: |
393 | verdict = ct_verdict & NF_VERDICT_MASK; |
394 | break; |
395 | } |
396 | } |
397 | nf_reinject(entry, verdict); |
398 | } |
399 | |
400 | static void |
401 | nfqnl_flush(struct nfqnl_instance *queue, nfqnl_cmpfn cmpfn, unsigned long data) |
402 | { |
403 | struct nf_queue_entry *entry, *next; |
404 | |
405 | spin_lock_bh(lock: &queue->lock); |
406 | list_for_each_entry_safe(entry, next, &queue->queue_list, list) { |
407 | if (!cmpfn || cmpfn(entry, data)) { |
408 | list_del(entry: &entry->list); |
409 | queue->queue_total--; |
410 | nfqnl_reinject(entry, NF_DROP); |
411 | } |
412 | } |
413 | spin_unlock_bh(lock: &queue->lock); |
414 | } |
415 | |
416 | static int |
417 | nfqnl_put_packet_info(struct sk_buff *nlskb, struct sk_buff *packet, |
418 | bool csum_verify) |
419 | { |
420 | __u32 flags = 0; |
421 | |
422 | if (packet->ip_summed == CHECKSUM_PARTIAL) |
423 | flags = NFQA_SKB_CSUMNOTREADY; |
424 | else if (csum_verify) |
425 | flags = NFQA_SKB_CSUM_NOTVERIFIED; |
426 | |
427 | if (skb_is_gso(skb: packet)) |
428 | flags |= NFQA_SKB_GSO; |
429 | |
430 | return flags ? nla_put_be32(skb: nlskb, attrtype: NFQA_SKB_INFO, htonl(flags)) : 0; |
431 | } |
432 | |
433 | static int nfqnl_put_sk_uidgid(struct sk_buff *skb, struct sock *sk) |
434 | { |
435 | const struct cred *cred; |
436 | |
437 | if (!sk_fullsock(sk)) |
438 | return 0; |
439 | |
440 | read_lock_bh(&sk->sk_callback_lock); |
441 | if (sk->sk_socket && sk->sk_socket->file) { |
442 | cred = sk->sk_socket->file->f_cred; |
443 | if (nla_put_be32(skb, attrtype: NFQA_UID, |
444 | htonl(from_kuid_munged(&init_user_ns, cred->fsuid)))) |
445 | goto nla_put_failure; |
446 | if (nla_put_be32(skb, attrtype: NFQA_GID, |
447 | htonl(from_kgid_munged(&init_user_ns, cred->fsgid)))) |
448 | goto nla_put_failure; |
449 | } |
450 | read_unlock_bh(&sk->sk_callback_lock); |
451 | return 0; |
452 | |
453 | nla_put_failure: |
454 | read_unlock_bh(&sk->sk_callback_lock); |
455 | return -1; |
456 | } |
457 | |
458 | static int nfqnl_put_sk_classid(struct sk_buff *skb, struct sock *sk) |
459 | { |
460 | #if IS_ENABLED(CONFIG_CGROUP_NET_CLASSID) |
461 | if (sk && sk_fullsock(sk)) { |
462 | u32 classid = sock_cgroup_classid(skcd: &sk->sk_cgrp_data); |
463 | |
464 | if (classid && nla_put_be32(skb, attrtype: NFQA_CGROUP_CLASSID, htonl(classid))) |
465 | return -1; |
466 | } |
467 | #endif |
468 | return 0; |
469 | } |
470 | |
471 | static u32 nfqnl_get_sk_secctx(struct sk_buff *skb, char **secdata) |
472 | { |
473 | u32 seclen = 0; |
474 | #if IS_ENABLED(CONFIG_NETWORK_SECMARK) |
475 | if (!skb || !sk_fullsock(sk: skb->sk)) |
476 | return 0; |
477 | |
478 | read_lock_bh(&skb->sk->sk_callback_lock); |
479 | |
480 | if (skb->secmark) |
481 | security_secid_to_secctx(secid: skb->secmark, secdata, seclen: &seclen); |
482 | |
483 | read_unlock_bh(&skb->sk->sk_callback_lock); |
484 | #endif |
485 | return seclen; |
486 | } |
487 | |
488 | static u32 nfqnl_get_bridge_size(struct nf_queue_entry *entry) |
489 | { |
490 | struct sk_buff *entskb = entry->skb; |
491 | u32 nlalen = 0; |
492 | |
493 | if (entry->state.pf != PF_BRIDGE || !skb_mac_header_was_set(skb: entskb)) |
494 | return 0; |
495 | |
496 | if (skb_vlan_tag_present(entskb)) |
497 | nlalen += nla_total_size(payload: nla_total_size(payload: sizeof(__be16)) + |
498 | nla_total_size(payload: sizeof(__be16))); |
499 | |
500 | if (entskb->network_header > entskb->mac_header) |
501 | nlalen += nla_total_size(payload: (entskb->network_header - |
502 | entskb->mac_header)); |
503 | |
504 | return nlalen; |
505 | } |
506 | |
507 | static int nfqnl_put_bridge(struct nf_queue_entry *entry, struct sk_buff *skb) |
508 | { |
509 | struct sk_buff *entskb = entry->skb; |
510 | |
511 | if (entry->state.pf != PF_BRIDGE || !skb_mac_header_was_set(skb: entskb)) |
512 | return 0; |
513 | |
514 | if (skb_vlan_tag_present(entskb)) { |
515 | struct nlattr *nest; |
516 | |
517 | nest = nla_nest_start(skb, attrtype: NFQA_VLAN); |
518 | if (!nest) |
519 | goto nla_put_failure; |
520 | |
521 | if (nla_put_be16(skb, attrtype: NFQA_VLAN_TCI, htons(entskb->vlan_tci)) || |
522 | nla_put_be16(skb, attrtype: NFQA_VLAN_PROTO, value: entskb->vlan_proto)) |
523 | goto nla_put_failure; |
524 | |
525 | nla_nest_end(skb, start: nest); |
526 | } |
527 | |
528 | if (entskb->mac_header < entskb->network_header) { |
529 | int len = (int)(entskb->network_header - entskb->mac_header); |
530 | |
531 | if (nla_put(skb, attrtype: NFQA_L2HDR, attrlen: len, data: skb_mac_header(skb: entskb))) |
532 | goto nla_put_failure; |
533 | } |
534 | |
535 | return 0; |
536 | |
537 | nla_put_failure: |
538 | return -1; |
539 | } |
540 | |
541 | static struct sk_buff * |
542 | nfqnl_build_packet_message(struct net *net, struct nfqnl_instance *queue, |
543 | struct nf_queue_entry *entry, |
544 | __be32 **packet_id_ptr) |
545 | { |
546 | size_t size; |
547 | size_t data_len = 0, cap_len = 0; |
548 | unsigned int hlen = 0; |
549 | struct sk_buff *skb; |
550 | struct nlattr *nla; |
551 | struct nfqnl_msg_packet_hdr *pmsg; |
552 | struct nlmsghdr *nlh; |
553 | struct sk_buff *entskb = entry->skb; |
554 | struct net_device *indev; |
555 | struct net_device *outdev; |
556 | struct nf_conn *ct = NULL; |
557 | enum ip_conntrack_info ctinfo = 0; |
558 | const struct nfnl_ct_hook *nfnl_ct; |
559 | bool csum_verify; |
560 | char *secdata = NULL; |
561 | u32 seclen = 0; |
562 | ktime_t tstamp; |
563 | |
564 | size = nlmsg_total_size(payload: sizeof(struct nfgenmsg)) |
565 | + nla_total_size(payload: sizeof(struct nfqnl_msg_packet_hdr)) |
566 | + nla_total_size(payload: sizeof(u_int32_t)) /* ifindex */ |
567 | + nla_total_size(payload: sizeof(u_int32_t)) /* ifindex */ |
568 | #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER) |
569 | + nla_total_size(payload: sizeof(u_int32_t)) /* ifindex */ |
570 | + nla_total_size(payload: sizeof(u_int32_t)) /* ifindex */ |
571 | #endif |
572 | + nla_total_size(payload: sizeof(u_int32_t)) /* mark */ |
573 | + nla_total_size(payload: sizeof(u_int32_t)) /* priority */ |
574 | + nla_total_size(payload: sizeof(struct nfqnl_msg_packet_hw)) |
575 | + nla_total_size(payload: sizeof(u_int32_t)) /* skbinfo */ |
576 | #if IS_ENABLED(CONFIG_CGROUP_NET_CLASSID) |
577 | + nla_total_size(payload: sizeof(u_int32_t)) /* classid */ |
578 | #endif |
579 | + nla_total_size(payload: sizeof(u_int32_t)); /* cap_len */ |
580 | |
581 | tstamp = skb_tstamp_cond(skb: entskb, cond: false); |
582 | if (tstamp) |
583 | size += nla_total_size(payload: sizeof(struct nfqnl_msg_packet_timestamp)); |
584 | |
585 | size += nfqnl_get_bridge_size(entry); |
586 | |
587 | if (entry->state.hook <= NF_INET_FORWARD || |
588 | (entry->state.hook == NF_INET_POST_ROUTING && entskb->sk == NULL)) |
589 | csum_verify = !skb_csum_unnecessary(skb: entskb); |
590 | else |
591 | csum_verify = false; |
592 | |
593 | outdev = entry->state.out; |
594 | |
595 | switch ((enum nfqnl_config_mode)READ_ONCE(queue->copy_mode)) { |
596 | case NFQNL_COPY_META: |
597 | case NFQNL_COPY_NONE: |
598 | break; |
599 | |
600 | case NFQNL_COPY_PACKET: |
601 | if (!(queue->flags & NFQA_CFG_F_GSO) && |
602 | entskb->ip_summed == CHECKSUM_PARTIAL && |
603 | skb_checksum_help(skb: entskb)) |
604 | return NULL; |
605 | |
606 | data_len = READ_ONCE(queue->copy_range); |
607 | if (data_len > entskb->len) |
608 | data_len = entskb->len; |
609 | |
610 | hlen = skb_zerocopy_headlen(from: entskb); |
611 | hlen = min_t(unsigned int, hlen, data_len); |
612 | size += sizeof(struct nlattr) + hlen; |
613 | cap_len = entskb->len; |
614 | break; |
615 | } |
616 | |
617 | nfnl_ct = rcu_dereference(nfnl_ct_hook); |
618 | |
619 | #if IS_ENABLED(CONFIG_NF_CONNTRACK) |
620 | if (queue->flags & NFQA_CFG_F_CONNTRACK) { |
621 | if (nfnl_ct != NULL) { |
622 | ct = nf_ct_get(skb: entskb, ctinfo: &ctinfo); |
623 | if (ct != NULL) |
624 | size += nfnl_ct->build_size(ct); |
625 | } |
626 | } |
627 | #endif |
628 | |
629 | if (queue->flags & NFQA_CFG_F_UID_GID) { |
630 | size += (nla_total_size(payload: sizeof(u_int32_t)) /* uid */ |
631 | + nla_total_size(payload: sizeof(u_int32_t))); /* gid */ |
632 | } |
633 | |
634 | if ((queue->flags & NFQA_CFG_F_SECCTX) && entskb->sk) { |
635 | seclen = nfqnl_get_sk_secctx(skb: entskb, secdata: &secdata); |
636 | if (seclen) |
637 | size += nla_total_size(payload: seclen); |
638 | } |
639 | |
640 | skb = alloc_skb(size, GFP_ATOMIC); |
641 | if (!skb) { |
642 | skb_tx_error(skb: entskb); |
643 | goto nlmsg_failure; |
644 | } |
645 | |
646 | nlh = nfnl_msg_put(skb, portid: 0, seq: 0, |
647 | type: nfnl_msg_type(NFNL_SUBSYS_QUEUE, msg_type: NFQNL_MSG_PACKET), |
648 | flags: 0, family: entry->state.pf, NFNETLINK_V0, |
649 | htons(queue->queue_num)); |
650 | if (!nlh) { |
651 | skb_tx_error(skb: entskb); |
652 | kfree_skb(skb); |
653 | goto nlmsg_failure; |
654 | } |
655 | |
656 | nla = __nla_reserve(skb, attrtype: NFQA_PACKET_HDR, attrlen: sizeof(*pmsg)); |
657 | pmsg = nla_data(nla); |
658 | pmsg->hw_protocol = entskb->protocol; |
659 | pmsg->hook = entry->state.hook; |
660 | *packet_id_ptr = &pmsg->packet_id; |
661 | |
662 | indev = entry->state.in; |
663 | if (indev) { |
664 | #if !IS_ENABLED(CONFIG_BRIDGE_NETFILTER) |
665 | if (nla_put_be32(skb, NFQA_IFINDEX_INDEV, htonl(indev->ifindex))) |
666 | goto nla_put_failure; |
667 | #else |
668 | if (entry->state.pf == PF_BRIDGE) { |
669 | /* Case 1: indev is physical input device, we need to |
670 | * look for bridge group (when called from |
671 | * netfilter_bridge) */ |
672 | if (nla_put_be32(skb, attrtype: NFQA_IFINDEX_PHYSINDEV, |
673 | htonl(indev->ifindex)) || |
674 | /* this is the bridge group "brX" */ |
675 | /* rcu_read_lock()ed by __nf_queue */ |
676 | nla_put_be32(skb, attrtype: NFQA_IFINDEX_INDEV, |
677 | htonl(br_port_get_rcu(indev)->br->dev->ifindex))) |
678 | goto nla_put_failure; |
679 | } else { |
680 | int physinif; |
681 | |
682 | /* Case 2: indev is bridge group, we need to look for |
683 | * physical device (when called from ipv4) */ |
684 | if (nla_put_be32(skb, attrtype: NFQA_IFINDEX_INDEV, |
685 | htonl(indev->ifindex))) |
686 | goto nla_put_failure; |
687 | |
688 | physinif = nf_bridge_get_physinif(skb: entskb); |
689 | if (physinif && |
690 | nla_put_be32(skb, attrtype: NFQA_IFINDEX_PHYSINDEV, |
691 | htonl(physinif))) |
692 | goto nla_put_failure; |
693 | } |
694 | #endif |
695 | } |
696 | |
697 | if (outdev) { |
698 | #if !IS_ENABLED(CONFIG_BRIDGE_NETFILTER) |
699 | if (nla_put_be32(skb, NFQA_IFINDEX_OUTDEV, htonl(outdev->ifindex))) |
700 | goto nla_put_failure; |
701 | #else |
702 | if (entry->state.pf == PF_BRIDGE) { |
703 | /* Case 1: outdev is physical output device, we need to |
704 | * look for bridge group (when called from |
705 | * netfilter_bridge) */ |
706 | if (nla_put_be32(skb, attrtype: NFQA_IFINDEX_PHYSOUTDEV, |
707 | htonl(outdev->ifindex)) || |
708 | /* this is the bridge group "brX" */ |
709 | /* rcu_read_lock()ed by __nf_queue */ |
710 | nla_put_be32(skb, attrtype: NFQA_IFINDEX_OUTDEV, |
711 | htonl(br_port_get_rcu(outdev)->br->dev->ifindex))) |
712 | goto nla_put_failure; |
713 | } else { |
714 | int physoutif; |
715 | |
716 | /* Case 2: outdev is bridge group, we need to look for |
717 | * physical output device (when called from ipv4) */ |
718 | if (nla_put_be32(skb, attrtype: NFQA_IFINDEX_OUTDEV, |
719 | htonl(outdev->ifindex))) |
720 | goto nla_put_failure; |
721 | |
722 | physoutif = nf_bridge_get_physoutif(skb: entskb); |
723 | if (physoutif && |
724 | nla_put_be32(skb, attrtype: NFQA_IFINDEX_PHYSOUTDEV, |
725 | htonl(physoutif))) |
726 | goto nla_put_failure; |
727 | } |
728 | #endif |
729 | } |
730 | |
731 | if (entskb->mark && |
732 | nla_put_be32(skb, attrtype: NFQA_MARK, htonl(entskb->mark))) |
733 | goto nla_put_failure; |
734 | |
735 | if (entskb->priority && |
736 | nla_put_be32(skb, attrtype: NFQA_PRIORITY, htonl(entskb->priority))) |
737 | goto nla_put_failure; |
738 | |
739 | if (indev && entskb->dev && |
740 | skb_mac_header_was_set(skb: entskb) && |
741 | skb_mac_header_len(skb: entskb) != 0) { |
742 | struct nfqnl_msg_packet_hw phw; |
743 | int len; |
744 | |
745 | memset(&phw, 0, sizeof(phw)); |
746 | len = dev_parse_header(skb: entskb, haddr: phw.hw_addr); |
747 | if (len) { |
748 | phw.hw_addrlen = htons(len); |
749 | if (nla_put(skb, attrtype: NFQA_HWADDR, attrlen: sizeof(phw), data: &phw)) |
750 | goto nla_put_failure; |
751 | } |
752 | } |
753 | |
754 | if (nfqnl_put_bridge(entry, skb) < 0) |
755 | goto nla_put_failure; |
756 | |
757 | if (entry->state.hook <= NF_INET_FORWARD && tstamp) { |
758 | struct nfqnl_msg_packet_timestamp ts; |
759 | struct timespec64 kts = ktime_to_timespec64(tstamp); |
760 | |
761 | ts.sec = cpu_to_be64(kts.tv_sec); |
762 | ts.usec = cpu_to_be64(kts.tv_nsec / NSEC_PER_USEC); |
763 | |
764 | if (nla_put(skb, attrtype: NFQA_TIMESTAMP, attrlen: sizeof(ts), data: &ts)) |
765 | goto nla_put_failure; |
766 | } |
767 | |
768 | if ((queue->flags & NFQA_CFG_F_UID_GID) && entskb->sk && |
769 | nfqnl_put_sk_uidgid(skb, sk: entskb->sk) < 0) |
770 | goto nla_put_failure; |
771 | |
772 | if (nfqnl_put_sk_classid(skb, sk: entskb->sk) < 0) |
773 | goto nla_put_failure; |
774 | |
775 | if (seclen && nla_put(skb, attrtype: NFQA_SECCTX, attrlen: seclen, data: secdata)) |
776 | goto nla_put_failure; |
777 | |
778 | if (ct && nfnl_ct->build(skb, ct, ctinfo, NFQA_CT, NFQA_CT_INFO) < 0) |
779 | goto nla_put_failure; |
780 | |
781 | if (cap_len > data_len && |
782 | nla_put_be32(skb, attrtype: NFQA_CAP_LEN, htonl(cap_len))) |
783 | goto nla_put_failure; |
784 | |
785 | if (nfqnl_put_packet_info(nlskb: skb, packet: entskb, csum_verify)) |
786 | goto nla_put_failure; |
787 | |
788 | if (data_len) { |
789 | struct nlattr *nla; |
790 | |
791 | if (skb_tailroom(skb) < sizeof(*nla) + hlen) |
792 | goto nla_put_failure; |
793 | |
794 | nla = skb_put(skb, len: sizeof(*nla)); |
795 | nla->nla_type = NFQA_PAYLOAD; |
796 | nla->nla_len = nla_attr_size(payload: data_len); |
797 | |
798 | if (skb_zerocopy(to: skb, from: entskb, len: data_len, hlen)) |
799 | goto nla_put_failure; |
800 | } |
801 | |
802 | nlh->nlmsg_len = skb->len; |
803 | if (seclen) |
804 | security_release_secctx(secdata, seclen); |
805 | return skb; |
806 | |
807 | nla_put_failure: |
808 | skb_tx_error(skb: entskb); |
809 | kfree_skb(skb); |
810 | net_err_ratelimited("nf_queue: error creating packet message\n" ); |
811 | nlmsg_failure: |
812 | if (seclen) |
813 | security_release_secctx(secdata, seclen); |
814 | return NULL; |
815 | } |
816 | |
817 | static bool nf_ct_drop_unconfirmed(const struct nf_queue_entry *entry) |
818 | { |
819 | #if IS_ENABLED(CONFIG_NF_CONNTRACK) |
820 | static const unsigned long flags = IPS_CONFIRMED | IPS_DYING; |
821 | const struct nf_conn *ct = (void *)skb_nfct(skb: entry->skb); |
822 | |
823 | if (ct && ((ct->status & flags) == IPS_DYING)) |
824 | return true; |
825 | #endif |
826 | return false; |
827 | } |
828 | |
829 | static int |
830 | __nfqnl_enqueue_packet(struct net *net, struct nfqnl_instance *queue, |
831 | struct nf_queue_entry *entry) |
832 | { |
833 | struct sk_buff *nskb; |
834 | int err = -ENOBUFS; |
835 | __be32 *packet_id_ptr; |
836 | int failopen = 0; |
837 | |
838 | nskb = nfqnl_build_packet_message(net, queue, entry, packet_id_ptr: &packet_id_ptr); |
839 | if (nskb == NULL) { |
840 | err = -ENOMEM; |
841 | goto err_out; |
842 | } |
843 | spin_lock_bh(lock: &queue->lock); |
844 | |
845 | if (nf_ct_drop_unconfirmed(entry)) |
846 | goto err_out_free_nskb; |
847 | |
848 | if (queue->queue_total >= queue->queue_maxlen) { |
849 | if (queue->flags & NFQA_CFG_F_FAIL_OPEN) { |
850 | failopen = 1; |
851 | err = 0; |
852 | } else { |
853 | queue->queue_dropped++; |
854 | net_warn_ratelimited("nf_queue: full at %d entries, dropping packets(s)\n" , |
855 | queue->queue_total); |
856 | } |
857 | goto err_out_free_nskb; |
858 | } |
859 | entry->id = ++queue->id_sequence; |
860 | *packet_id_ptr = htonl(entry->id); |
861 | |
862 | /* nfnetlink_unicast will either free the nskb or add it to a socket */ |
863 | err = nfnetlink_unicast(skb: nskb, net, portid: queue->peer_portid); |
864 | if (err < 0) { |
865 | if (queue->flags & NFQA_CFG_F_FAIL_OPEN) { |
866 | failopen = 1; |
867 | err = 0; |
868 | } else { |
869 | queue->queue_user_dropped++; |
870 | } |
871 | goto err_out_unlock; |
872 | } |
873 | |
874 | __enqueue_entry(queue, entry); |
875 | |
876 | spin_unlock_bh(lock: &queue->lock); |
877 | return 0; |
878 | |
879 | err_out_free_nskb: |
880 | kfree_skb(skb: nskb); |
881 | err_out_unlock: |
882 | spin_unlock_bh(lock: &queue->lock); |
883 | if (failopen) |
884 | nfqnl_reinject(entry, NF_ACCEPT); |
885 | err_out: |
886 | return err; |
887 | } |
888 | |
889 | static struct nf_queue_entry * |
890 | nf_queue_entry_dup(struct nf_queue_entry *e) |
891 | { |
892 | struct nf_queue_entry *entry = kmemdup(p: e, size: e->size, GFP_ATOMIC); |
893 | |
894 | if (!entry) |
895 | return NULL; |
896 | |
897 | if (nf_queue_entry_get_refs(entry)) |
898 | return entry; |
899 | |
900 | kfree(objp: entry); |
901 | return NULL; |
902 | } |
903 | |
904 | #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER) |
905 | /* When called from bridge netfilter, skb->data must point to MAC header |
906 | * before calling skb_gso_segment(). Else, original MAC header is lost |
907 | * and segmented skbs will be sent to wrong destination. |
908 | */ |
909 | static void nf_bridge_adjust_skb_data(struct sk_buff *skb) |
910 | { |
911 | if (nf_bridge_info_get(skb)) |
912 | __skb_push(skb, len: skb->network_header - skb->mac_header); |
913 | } |
914 | |
915 | static void nf_bridge_adjust_segmented_data(struct sk_buff *skb) |
916 | { |
917 | if (nf_bridge_info_get(skb)) |
918 | __skb_pull(skb, len: skb->network_header - skb->mac_header); |
919 | } |
920 | #else |
921 | #define nf_bridge_adjust_skb_data(s) do {} while (0) |
922 | #define nf_bridge_adjust_segmented_data(s) do {} while (0) |
923 | #endif |
924 | |
925 | static int |
926 | __nfqnl_enqueue_packet_gso(struct net *net, struct nfqnl_instance *queue, |
927 | struct sk_buff *skb, struct nf_queue_entry *entry) |
928 | { |
929 | int ret = -ENOMEM; |
930 | struct nf_queue_entry *entry_seg; |
931 | |
932 | nf_bridge_adjust_segmented_data(skb); |
933 | |
934 | if (skb->next == NULL) { /* last packet, no need to copy entry */ |
935 | struct sk_buff *gso_skb = entry->skb; |
936 | entry->skb = skb; |
937 | ret = __nfqnl_enqueue_packet(net, queue, entry); |
938 | if (ret) |
939 | entry->skb = gso_skb; |
940 | return ret; |
941 | } |
942 | |
943 | skb_mark_not_on_list(skb); |
944 | |
945 | entry_seg = nf_queue_entry_dup(e: entry); |
946 | if (entry_seg) { |
947 | entry_seg->skb = skb; |
948 | ret = __nfqnl_enqueue_packet(net, queue, entry: entry_seg); |
949 | if (ret) |
950 | nf_queue_entry_free(entry: entry_seg); |
951 | } |
952 | return ret; |
953 | } |
954 | |
955 | static int |
956 | nfqnl_enqueue_packet(struct nf_queue_entry *entry, unsigned int queuenum) |
957 | { |
958 | unsigned int queued; |
959 | struct nfqnl_instance *queue; |
960 | struct sk_buff *skb, *segs, *nskb; |
961 | int err = -ENOBUFS; |
962 | struct net *net = entry->state.net; |
963 | struct nfnl_queue_net *q = nfnl_queue_pernet(net); |
964 | |
965 | /* rcu_read_lock()ed by nf_hook_thresh */ |
966 | queue = instance_lookup(q, queue_num: queuenum); |
967 | if (!queue) |
968 | return -ESRCH; |
969 | |
970 | if (queue->copy_mode == NFQNL_COPY_NONE) |
971 | return -EINVAL; |
972 | |
973 | skb = entry->skb; |
974 | |
975 | switch (entry->state.pf) { |
976 | case NFPROTO_IPV4: |
977 | skb->protocol = htons(ETH_P_IP); |
978 | break; |
979 | case NFPROTO_IPV6: |
980 | skb->protocol = htons(ETH_P_IPV6); |
981 | break; |
982 | } |
983 | |
984 | if ((queue->flags & NFQA_CFG_F_GSO) || !skb_is_gso(skb)) |
985 | return __nfqnl_enqueue_packet(net, queue, entry); |
986 | |
987 | nf_bridge_adjust_skb_data(skb); |
988 | segs = skb_gso_segment(skb, features: 0); |
989 | /* Does not use PTR_ERR to limit the number of error codes that can be |
990 | * returned by nf_queue. For instance, callers rely on -ESRCH to |
991 | * mean 'ignore this hook'. |
992 | */ |
993 | if (IS_ERR_OR_NULL(ptr: segs)) |
994 | goto out_err; |
995 | queued = 0; |
996 | err = 0; |
997 | skb_list_walk_safe(segs, segs, nskb) { |
998 | if (err == 0) |
999 | err = __nfqnl_enqueue_packet_gso(net, queue, |
1000 | skb: segs, entry); |
1001 | if (err == 0) |
1002 | queued++; |
1003 | else |
1004 | kfree_skb(skb: segs); |
1005 | } |
1006 | |
1007 | if (queued) { |
1008 | if (err) /* some segments are already queued */ |
1009 | nf_queue_entry_free(entry); |
1010 | kfree_skb(skb); |
1011 | return 0; |
1012 | } |
1013 | out_err: |
1014 | nf_bridge_adjust_segmented_data(skb); |
1015 | return err; |
1016 | } |
1017 | |
1018 | static int |
1019 | nfqnl_mangle(void *data, unsigned int data_len, struct nf_queue_entry *e, int diff) |
1020 | { |
1021 | struct sk_buff *nskb; |
1022 | |
1023 | if (diff < 0) { |
1024 | unsigned int min_len = skb_transport_offset(skb: e->skb); |
1025 | |
1026 | if (data_len < min_len) |
1027 | return -EINVAL; |
1028 | |
1029 | if (pskb_trim(skb: e->skb, len: data_len)) |
1030 | return -ENOMEM; |
1031 | } else if (diff > 0) { |
1032 | if (data_len > 0xFFFF) |
1033 | return -EINVAL; |
1034 | if (diff > skb_tailroom(skb: e->skb)) { |
1035 | nskb = skb_copy_expand(skb: e->skb, newheadroom: skb_headroom(skb: e->skb), |
1036 | newtailroom: diff, GFP_ATOMIC); |
1037 | if (!nskb) |
1038 | return -ENOMEM; |
1039 | kfree_skb(skb: e->skb); |
1040 | e->skb = nskb; |
1041 | } |
1042 | skb_put(skb: e->skb, len: diff); |
1043 | } |
1044 | if (skb_ensure_writable(skb: e->skb, write_len: data_len)) |
1045 | return -ENOMEM; |
1046 | skb_copy_to_linear_data(skb: e->skb, from: data, len: data_len); |
1047 | e->skb->ip_summed = CHECKSUM_NONE; |
1048 | return 0; |
1049 | } |
1050 | |
1051 | static int |
1052 | nfqnl_set_mode(struct nfqnl_instance *queue, |
1053 | unsigned char mode, unsigned int range) |
1054 | { |
1055 | int status = 0; |
1056 | |
1057 | spin_lock_bh(lock: &queue->lock); |
1058 | switch (mode) { |
1059 | case NFQNL_COPY_NONE: |
1060 | case NFQNL_COPY_META: |
1061 | queue->copy_mode = mode; |
1062 | queue->copy_range = 0; |
1063 | break; |
1064 | |
1065 | case NFQNL_COPY_PACKET: |
1066 | queue->copy_mode = mode; |
1067 | if (range == 0 || range > NFQNL_MAX_COPY_RANGE) |
1068 | queue->copy_range = NFQNL_MAX_COPY_RANGE; |
1069 | else |
1070 | queue->copy_range = range; |
1071 | break; |
1072 | |
1073 | default: |
1074 | status = -EINVAL; |
1075 | |
1076 | } |
1077 | spin_unlock_bh(lock: &queue->lock); |
1078 | |
1079 | return status; |
1080 | } |
1081 | |
1082 | static int |
1083 | dev_cmp(struct nf_queue_entry *entry, unsigned long ifindex) |
1084 | { |
1085 | #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER) |
1086 | int physinif, physoutif; |
1087 | |
1088 | physinif = nf_bridge_get_physinif(skb: entry->skb); |
1089 | physoutif = nf_bridge_get_physoutif(skb: entry->skb); |
1090 | |
1091 | if (physinif == ifindex || physoutif == ifindex) |
1092 | return 1; |
1093 | #endif |
1094 | if (entry->state.in) |
1095 | if (entry->state.in->ifindex == ifindex) |
1096 | return 1; |
1097 | if (entry->state.out) |
1098 | if (entry->state.out->ifindex == ifindex) |
1099 | return 1; |
1100 | |
1101 | return 0; |
1102 | } |
1103 | |
1104 | /* drop all packets with either indev or outdev == ifindex from all queue |
1105 | * instances */ |
1106 | static void |
1107 | nfqnl_dev_drop(struct net *net, int ifindex) |
1108 | { |
1109 | int i; |
1110 | struct nfnl_queue_net *q = nfnl_queue_pernet(net); |
1111 | |
1112 | rcu_read_lock(); |
1113 | |
1114 | for (i = 0; i < INSTANCE_BUCKETS; i++) { |
1115 | struct nfqnl_instance *inst; |
1116 | struct hlist_head *head = &q->instance_table[i]; |
1117 | |
1118 | hlist_for_each_entry_rcu(inst, head, hlist) |
1119 | nfqnl_flush(queue: inst, cmpfn: dev_cmp, data: ifindex); |
1120 | } |
1121 | |
1122 | rcu_read_unlock(); |
1123 | } |
1124 | |
1125 | static int |
1126 | nfqnl_rcv_dev_event(struct notifier_block *this, |
1127 | unsigned long event, void *ptr) |
1128 | { |
1129 | struct net_device *dev = netdev_notifier_info_to_dev(info: ptr); |
1130 | |
1131 | /* Drop any packets associated with the downed device */ |
1132 | if (event == NETDEV_DOWN) |
1133 | nfqnl_dev_drop(net: dev_net(dev), ifindex: dev->ifindex); |
1134 | return NOTIFY_DONE; |
1135 | } |
1136 | |
1137 | static struct notifier_block nfqnl_dev_notifier = { |
1138 | .notifier_call = nfqnl_rcv_dev_event, |
1139 | }; |
1140 | |
1141 | static void nfqnl_nf_hook_drop(struct net *net) |
1142 | { |
1143 | struct nfnl_queue_net *q = nfnl_queue_pernet(net); |
1144 | int i; |
1145 | |
1146 | /* This function is also called on net namespace error unwind, |
1147 | * when pernet_ops->init() failed and ->exit() functions of the |
1148 | * previous pernet_ops gets called. |
1149 | * |
1150 | * This may result in a call to nfqnl_nf_hook_drop() before |
1151 | * struct nfnl_queue_net was allocated. |
1152 | */ |
1153 | if (!q) |
1154 | return; |
1155 | |
1156 | for (i = 0; i < INSTANCE_BUCKETS; i++) { |
1157 | struct nfqnl_instance *inst; |
1158 | struct hlist_head *head = &q->instance_table[i]; |
1159 | |
1160 | hlist_for_each_entry_rcu(inst, head, hlist) |
1161 | nfqnl_flush(queue: inst, NULL, data: 0); |
1162 | } |
1163 | } |
1164 | |
1165 | static int |
1166 | nfqnl_rcv_nl_event(struct notifier_block *this, |
1167 | unsigned long event, void *ptr) |
1168 | { |
1169 | struct netlink_notify *n = ptr; |
1170 | struct nfnl_queue_net *q = nfnl_queue_pernet(net: n->net); |
1171 | |
1172 | if (event == NETLINK_URELEASE && n->protocol == NETLINK_NETFILTER) { |
1173 | int i; |
1174 | |
1175 | /* destroy all instances for this portid */ |
1176 | spin_lock(lock: &q->instances_lock); |
1177 | for (i = 0; i < INSTANCE_BUCKETS; i++) { |
1178 | struct hlist_node *t2; |
1179 | struct nfqnl_instance *inst; |
1180 | struct hlist_head *head = &q->instance_table[i]; |
1181 | |
1182 | hlist_for_each_entry_safe(inst, t2, head, hlist) { |
1183 | if (n->portid == inst->peer_portid) |
1184 | __instance_destroy(inst); |
1185 | } |
1186 | } |
1187 | spin_unlock(lock: &q->instances_lock); |
1188 | } |
1189 | return NOTIFY_DONE; |
1190 | } |
1191 | |
1192 | static struct notifier_block nfqnl_rtnl_notifier = { |
1193 | .notifier_call = nfqnl_rcv_nl_event, |
1194 | }; |
1195 | |
1196 | static const struct nla_policy nfqa_vlan_policy[NFQA_VLAN_MAX + 1] = { |
1197 | [NFQA_VLAN_TCI] = { .type = NLA_U16}, |
1198 | [NFQA_VLAN_PROTO] = { .type = NLA_U16}, |
1199 | }; |
1200 | |
1201 | static const struct nla_policy nfqa_verdict_policy[NFQA_MAX+1] = { |
1202 | [NFQA_VERDICT_HDR] = { .len = sizeof(struct nfqnl_msg_verdict_hdr) }, |
1203 | [NFQA_MARK] = { .type = NLA_U32 }, |
1204 | [NFQA_PAYLOAD] = { .type = NLA_UNSPEC }, |
1205 | [NFQA_CT] = { .type = NLA_UNSPEC }, |
1206 | [NFQA_EXP] = { .type = NLA_UNSPEC }, |
1207 | [NFQA_VLAN] = { .type = NLA_NESTED }, |
1208 | [NFQA_PRIORITY] = { .type = NLA_U32 }, |
1209 | }; |
1210 | |
1211 | static const struct nla_policy nfqa_verdict_batch_policy[NFQA_MAX+1] = { |
1212 | [NFQA_VERDICT_HDR] = { .len = sizeof(struct nfqnl_msg_verdict_hdr) }, |
1213 | [NFQA_MARK] = { .type = NLA_U32 }, |
1214 | [NFQA_PRIORITY] = { .type = NLA_U32 }, |
1215 | }; |
1216 | |
1217 | static struct nfqnl_instance * |
1218 | verdict_instance_lookup(struct nfnl_queue_net *q, u16 queue_num, u32 nlportid) |
1219 | { |
1220 | struct nfqnl_instance *queue; |
1221 | |
1222 | queue = instance_lookup(q, queue_num); |
1223 | if (!queue) |
1224 | return ERR_PTR(error: -ENODEV); |
1225 | |
1226 | if (queue->peer_portid != nlportid) |
1227 | return ERR_PTR(error: -EPERM); |
1228 | |
1229 | return queue; |
1230 | } |
1231 | |
1232 | static struct nfqnl_msg_verdict_hdr* |
1233 | verdicthdr_get(const struct nlattr * const nfqa[]) |
1234 | { |
1235 | struct nfqnl_msg_verdict_hdr *vhdr; |
1236 | unsigned int verdict; |
1237 | |
1238 | if (!nfqa[NFQA_VERDICT_HDR]) |
1239 | return NULL; |
1240 | |
1241 | vhdr = nla_data(nla: nfqa[NFQA_VERDICT_HDR]); |
1242 | verdict = ntohl(vhdr->verdict) & NF_VERDICT_MASK; |
1243 | if (verdict > NF_MAX_VERDICT || verdict == NF_STOLEN) |
1244 | return NULL; |
1245 | return vhdr; |
1246 | } |
1247 | |
1248 | static int nfq_id_after(unsigned int id, unsigned int max) |
1249 | { |
1250 | return (int)(id - max) > 0; |
1251 | } |
1252 | |
1253 | static int nfqnl_recv_verdict_batch(struct sk_buff *skb, |
1254 | const struct nfnl_info *info, |
1255 | const struct nlattr * const nfqa[]) |
1256 | { |
1257 | struct nfnl_queue_net *q = nfnl_queue_pernet(net: info->net); |
1258 | u16 queue_num = ntohs(info->nfmsg->res_id); |
1259 | struct nf_queue_entry *entry, *tmp; |
1260 | struct nfqnl_msg_verdict_hdr *vhdr; |
1261 | struct nfqnl_instance *queue; |
1262 | unsigned int verdict, maxid; |
1263 | LIST_HEAD(batch_list); |
1264 | |
1265 | queue = verdict_instance_lookup(q, queue_num, |
1266 | NETLINK_CB(skb).portid); |
1267 | if (IS_ERR(ptr: queue)) |
1268 | return PTR_ERR(ptr: queue); |
1269 | |
1270 | vhdr = verdicthdr_get(nfqa); |
1271 | if (!vhdr) |
1272 | return -EINVAL; |
1273 | |
1274 | verdict = ntohl(vhdr->verdict); |
1275 | maxid = ntohl(vhdr->id); |
1276 | |
1277 | spin_lock_bh(lock: &queue->lock); |
1278 | |
1279 | list_for_each_entry_safe(entry, tmp, &queue->queue_list, list) { |
1280 | if (nfq_id_after(id: entry->id, max: maxid)) |
1281 | break; |
1282 | __dequeue_entry(queue, entry); |
1283 | list_add_tail(new: &entry->list, head: &batch_list); |
1284 | } |
1285 | |
1286 | spin_unlock_bh(lock: &queue->lock); |
1287 | |
1288 | if (list_empty(head: &batch_list)) |
1289 | return -ENOENT; |
1290 | |
1291 | list_for_each_entry_safe(entry, tmp, &batch_list, list) { |
1292 | if (nfqa[NFQA_MARK]) |
1293 | entry->skb->mark = ntohl(nla_get_be32(nfqa[NFQA_MARK])); |
1294 | |
1295 | if (nfqa[NFQA_PRIORITY]) |
1296 | entry->skb->priority = ntohl(nla_get_be32(nfqa[NFQA_PRIORITY])); |
1297 | |
1298 | nfqnl_reinject(entry, verdict); |
1299 | } |
1300 | return 0; |
1301 | } |
1302 | |
1303 | static struct nf_conn *nfqnl_ct_parse(const struct nfnl_ct_hook *nfnl_ct, |
1304 | const struct nlmsghdr *nlh, |
1305 | const struct nlattr * const nfqa[], |
1306 | struct nf_queue_entry *entry, |
1307 | enum ip_conntrack_info *ctinfo) |
1308 | { |
1309 | #if IS_ENABLED(CONFIG_NF_CONNTRACK) |
1310 | struct nf_conn *ct; |
1311 | |
1312 | ct = nf_ct_get(skb: entry->skb, ctinfo); |
1313 | if (ct == NULL) |
1314 | return NULL; |
1315 | |
1316 | if (nfnl_ct->parse(nfqa[NFQA_CT], ct) < 0) |
1317 | return NULL; |
1318 | |
1319 | if (nfqa[NFQA_EXP]) |
1320 | nfnl_ct->attach_expect(nfqa[NFQA_EXP], ct, |
1321 | NETLINK_CB(entry->skb).portid, |
1322 | nlmsg_report(nlh)); |
1323 | return ct; |
1324 | #else |
1325 | return NULL; |
1326 | #endif |
1327 | } |
1328 | |
1329 | static int nfqa_parse_bridge(struct nf_queue_entry *entry, |
1330 | const struct nlattr * const nfqa[]) |
1331 | { |
1332 | if (nfqa[NFQA_VLAN]) { |
1333 | struct nlattr *tb[NFQA_VLAN_MAX + 1]; |
1334 | int err; |
1335 | |
1336 | err = nla_parse_nested_deprecated(tb, NFQA_VLAN_MAX, |
1337 | nla: nfqa[NFQA_VLAN], |
1338 | policy: nfqa_vlan_policy, NULL); |
1339 | if (err < 0) |
1340 | return err; |
1341 | |
1342 | if (!tb[NFQA_VLAN_TCI] || !tb[NFQA_VLAN_PROTO]) |
1343 | return -EINVAL; |
1344 | |
1345 | __vlan_hwaccel_put_tag(skb: entry->skb, |
1346 | vlan_proto: nla_get_be16(nla: tb[NFQA_VLAN_PROTO]), |
1347 | ntohs(nla_get_be16(tb[NFQA_VLAN_TCI]))); |
1348 | } |
1349 | |
1350 | if (nfqa[NFQA_L2HDR]) { |
1351 | int = entry->skb->network_header - |
1352 | entry->skb->mac_header; |
1353 | |
1354 | if (mac_header_len != nla_len(nla: nfqa[NFQA_L2HDR])) |
1355 | return -EINVAL; |
1356 | else if (mac_header_len > 0) |
1357 | memcpy(skb_mac_header(entry->skb), |
1358 | nla_data(nfqa[NFQA_L2HDR]), |
1359 | mac_header_len); |
1360 | } |
1361 | |
1362 | return 0; |
1363 | } |
1364 | |
1365 | static int nfqnl_recv_verdict(struct sk_buff *skb, const struct nfnl_info *info, |
1366 | const struct nlattr * const nfqa[]) |
1367 | { |
1368 | struct nfnl_queue_net *q = nfnl_queue_pernet(net: info->net); |
1369 | u_int16_t queue_num = ntohs(info->nfmsg->res_id); |
1370 | const struct nfnl_ct_hook *nfnl_ct; |
1371 | struct nfqnl_msg_verdict_hdr *vhdr; |
1372 | enum ip_conntrack_info ctinfo; |
1373 | struct nfqnl_instance *queue; |
1374 | struct nf_queue_entry *entry; |
1375 | struct nf_conn *ct = NULL; |
1376 | unsigned int verdict; |
1377 | int err; |
1378 | |
1379 | queue = verdict_instance_lookup(q, queue_num, |
1380 | NETLINK_CB(skb).portid); |
1381 | if (IS_ERR(ptr: queue)) |
1382 | return PTR_ERR(ptr: queue); |
1383 | |
1384 | vhdr = verdicthdr_get(nfqa); |
1385 | if (!vhdr) |
1386 | return -EINVAL; |
1387 | |
1388 | verdict = ntohl(vhdr->verdict); |
1389 | |
1390 | entry = find_dequeue_entry(queue, ntohl(vhdr->id)); |
1391 | if (entry == NULL) |
1392 | return -ENOENT; |
1393 | |
1394 | /* rcu lock already held from nfnl->call_rcu. */ |
1395 | nfnl_ct = rcu_dereference(nfnl_ct_hook); |
1396 | |
1397 | if (nfqa[NFQA_CT]) { |
1398 | if (nfnl_ct != NULL) |
1399 | ct = nfqnl_ct_parse(nfnl_ct, nlh: info->nlh, nfqa, entry, |
1400 | ctinfo: &ctinfo); |
1401 | } |
1402 | |
1403 | if (entry->state.pf == PF_BRIDGE) { |
1404 | err = nfqa_parse_bridge(entry, nfqa); |
1405 | if (err < 0) |
1406 | return err; |
1407 | } |
1408 | |
1409 | if (nfqa[NFQA_PAYLOAD]) { |
1410 | u16 payload_len = nla_len(nla: nfqa[NFQA_PAYLOAD]); |
1411 | int diff = payload_len - entry->skb->len; |
1412 | |
1413 | if (nfqnl_mangle(data: nla_data(nla: nfqa[NFQA_PAYLOAD]), |
1414 | data_len: payload_len, e: entry, diff) < 0) |
1415 | verdict = NF_DROP; |
1416 | |
1417 | if (ct && diff) |
1418 | nfnl_ct->seq_adjust(entry->skb, ct, ctinfo, diff); |
1419 | } |
1420 | |
1421 | if (nfqa[NFQA_MARK]) |
1422 | entry->skb->mark = ntohl(nla_get_be32(nfqa[NFQA_MARK])); |
1423 | |
1424 | if (nfqa[NFQA_PRIORITY]) |
1425 | entry->skb->priority = ntohl(nla_get_be32(nfqa[NFQA_PRIORITY])); |
1426 | |
1427 | nfqnl_reinject(entry, verdict); |
1428 | return 0; |
1429 | } |
1430 | |
1431 | static int nfqnl_recv_unsupp(struct sk_buff *skb, const struct nfnl_info *info, |
1432 | const struct nlattr * const cda[]) |
1433 | { |
1434 | return -ENOTSUPP; |
1435 | } |
1436 | |
1437 | static const struct nla_policy nfqa_cfg_policy[NFQA_CFG_MAX+1] = { |
1438 | [NFQA_CFG_CMD] = { .len = sizeof(struct nfqnl_msg_config_cmd) }, |
1439 | [NFQA_CFG_PARAMS] = { .len = sizeof(struct nfqnl_msg_config_params) }, |
1440 | [NFQA_CFG_QUEUE_MAXLEN] = { .type = NLA_U32 }, |
1441 | [NFQA_CFG_MASK] = { .type = NLA_U32 }, |
1442 | [NFQA_CFG_FLAGS] = { .type = NLA_U32 }, |
1443 | }; |
1444 | |
1445 | static const struct nf_queue_handler nfqh = { |
1446 | .outfn = nfqnl_enqueue_packet, |
1447 | .nf_hook_drop = nfqnl_nf_hook_drop, |
1448 | }; |
1449 | |
1450 | static int nfqnl_recv_config(struct sk_buff *skb, const struct nfnl_info *info, |
1451 | const struct nlattr * const nfqa[]) |
1452 | { |
1453 | struct nfnl_queue_net *q = nfnl_queue_pernet(net: info->net); |
1454 | u_int16_t queue_num = ntohs(info->nfmsg->res_id); |
1455 | struct nfqnl_msg_config_cmd *cmd = NULL; |
1456 | struct nfqnl_instance *queue; |
1457 | __u32 flags = 0, mask = 0; |
1458 | int ret = 0; |
1459 | |
1460 | if (nfqa[NFQA_CFG_CMD]) { |
1461 | cmd = nla_data(nla: nfqa[NFQA_CFG_CMD]); |
1462 | |
1463 | /* Obsolete commands without queue context */ |
1464 | switch (cmd->command) { |
1465 | case NFQNL_CFG_CMD_PF_BIND: return 0; |
1466 | case NFQNL_CFG_CMD_PF_UNBIND: return 0; |
1467 | } |
1468 | } |
1469 | |
1470 | /* Check if we support these flags in first place, dependencies should |
1471 | * be there too not to break atomicity. |
1472 | */ |
1473 | if (nfqa[NFQA_CFG_FLAGS]) { |
1474 | if (!nfqa[NFQA_CFG_MASK]) { |
1475 | /* A mask is needed to specify which flags are being |
1476 | * changed. |
1477 | */ |
1478 | return -EINVAL; |
1479 | } |
1480 | |
1481 | flags = ntohl(nla_get_be32(nfqa[NFQA_CFG_FLAGS])); |
1482 | mask = ntohl(nla_get_be32(nfqa[NFQA_CFG_MASK])); |
1483 | |
1484 | if (flags >= NFQA_CFG_F_MAX) |
1485 | return -EOPNOTSUPP; |
1486 | |
1487 | #if !IS_ENABLED(CONFIG_NETWORK_SECMARK) |
1488 | if (flags & mask & NFQA_CFG_F_SECCTX) |
1489 | return -EOPNOTSUPP; |
1490 | #endif |
1491 | if ((flags & mask & NFQA_CFG_F_CONNTRACK) && |
1492 | !rcu_access_pointer(nfnl_ct_hook)) { |
1493 | #ifdef CONFIG_MODULES |
1494 | nfnl_unlock(NFNL_SUBSYS_QUEUE); |
1495 | request_module("ip_conntrack_netlink" ); |
1496 | nfnl_lock(NFNL_SUBSYS_QUEUE); |
1497 | if (rcu_access_pointer(nfnl_ct_hook)) |
1498 | return -EAGAIN; |
1499 | #endif |
1500 | return -EOPNOTSUPP; |
1501 | } |
1502 | } |
1503 | |
1504 | rcu_read_lock(); |
1505 | queue = instance_lookup(q, queue_num); |
1506 | if (queue && queue->peer_portid != NETLINK_CB(skb).portid) { |
1507 | ret = -EPERM; |
1508 | goto err_out_unlock; |
1509 | } |
1510 | |
1511 | if (cmd != NULL) { |
1512 | switch (cmd->command) { |
1513 | case NFQNL_CFG_CMD_BIND: |
1514 | if (queue) { |
1515 | ret = -EBUSY; |
1516 | goto err_out_unlock; |
1517 | } |
1518 | queue = instance_create(q, queue_num, |
1519 | NETLINK_CB(skb).portid); |
1520 | if (IS_ERR(ptr: queue)) { |
1521 | ret = PTR_ERR(ptr: queue); |
1522 | goto err_out_unlock; |
1523 | } |
1524 | break; |
1525 | case NFQNL_CFG_CMD_UNBIND: |
1526 | if (!queue) { |
1527 | ret = -ENODEV; |
1528 | goto err_out_unlock; |
1529 | } |
1530 | instance_destroy(q, inst: queue); |
1531 | goto err_out_unlock; |
1532 | case NFQNL_CFG_CMD_PF_BIND: |
1533 | case NFQNL_CFG_CMD_PF_UNBIND: |
1534 | break; |
1535 | default: |
1536 | ret = -ENOTSUPP; |
1537 | goto err_out_unlock; |
1538 | } |
1539 | } |
1540 | |
1541 | if (!queue) { |
1542 | ret = -ENODEV; |
1543 | goto err_out_unlock; |
1544 | } |
1545 | |
1546 | if (nfqa[NFQA_CFG_PARAMS]) { |
1547 | struct nfqnl_msg_config_params *params = |
1548 | nla_data(nla: nfqa[NFQA_CFG_PARAMS]); |
1549 | |
1550 | nfqnl_set_mode(queue, mode: params->copy_mode, |
1551 | ntohl(params->copy_range)); |
1552 | } |
1553 | |
1554 | if (nfqa[NFQA_CFG_QUEUE_MAXLEN]) { |
1555 | __be32 *queue_maxlen = nla_data(nla: nfqa[NFQA_CFG_QUEUE_MAXLEN]); |
1556 | |
1557 | spin_lock_bh(lock: &queue->lock); |
1558 | queue->queue_maxlen = ntohl(*queue_maxlen); |
1559 | spin_unlock_bh(lock: &queue->lock); |
1560 | } |
1561 | |
1562 | if (nfqa[NFQA_CFG_FLAGS]) { |
1563 | spin_lock_bh(lock: &queue->lock); |
1564 | queue->flags &= ~mask; |
1565 | queue->flags |= flags & mask; |
1566 | spin_unlock_bh(lock: &queue->lock); |
1567 | } |
1568 | |
1569 | err_out_unlock: |
1570 | rcu_read_unlock(); |
1571 | return ret; |
1572 | } |
1573 | |
1574 | static const struct nfnl_callback nfqnl_cb[NFQNL_MSG_MAX] = { |
1575 | [NFQNL_MSG_PACKET] = { |
1576 | .call = nfqnl_recv_unsupp, |
1577 | .type = NFNL_CB_RCU, |
1578 | .attr_count = NFQA_MAX, |
1579 | }, |
1580 | [NFQNL_MSG_VERDICT] = { |
1581 | .call = nfqnl_recv_verdict, |
1582 | .type = NFNL_CB_RCU, |
1583 | .attr_count = NFQA_MAX, |
1584 | .policy = nfqa_verdict_policy |
1585 | }, |
1586 | [NFQNL_MSG_CONFIG] = { |
1587 | .call = nfqnl_recv_config, |
1588 | .type = NFNL_CB_MUTEX, |
1589 | .attr_count = NFQA_CFG_MAX, |
1590 | .policy = nfqa_cfg_policy |
1591 | }, |
1592 | [NFQNL_MSG_VERDICT_BATCH] = { |
1593 | .call = nfqnl_recv_verdict_batch, |
1594 | .type = NFNL_CB_RCU, |
1595 | .attr_count = NFQA_MAX, |
1596 | .policy = nfqa_verdict_batch_policy |
1597 | }, |
1598 | }; |
1599 | |
1600 | static const struct nfnetlink_subsystem nfqnl_subsys = { |
1601 | .name = "nf_queue" , |
1602 | .subsys_id = NFNL_SUBSYS_QUEUE, |
1603 | .cb_count = NFQNL_MSG_MAX, |
1604 | .cb = nfqnl_cb, |
1605 | }; |
1606 | |
1607 | #ifdef CONFIG_PROC_FS |
1608 | struct iter_state { |
1609 | struct seq_net_private p; |
1610 | unsigned int bucket; |
1611 | }; |
1612 | |
1613 | static struct hlist_node *get_first(struct seq_file *seq) |
1614 | { |
1615 | struct iter_state *st = seq->private; |
1616 | struct net *net; |
1617 | struct nfnl_queue_net *q; |
1618 | |
1619 | if (!st) |
1620 | return NULL; |
1621 | |
1622 | net = seq_file_net(seq); |
1623 | q = nfnl_queue_pernet(net); |
1624 | for (st->bucket = 0; st->bucket < INSTANCE_BUCKETS; st->bucket++) { |
1625 | if (!hlist_empty(h: &q->instance_table[st->bucket])) |
1626 | return q->instance_table[st->bucket].first; |
1627 | } |
1628 | return NULL; |
1629 | } |
1630 | |
1631 | static struct hlist_node *get_next(struct seq_file *seq, struct hlist_node *h) |
1632 | { |
1633 | struct iter_state *st = seq->private; |
1634 | struct net *net = seq_file_net(seq); |
1635 | |
1636 | h = h->next; |
1637 | while (!h) { |
1638 | struct nfnl_queue_net *q; |
1639 | |
1640 | if (++st->bucket >= INSTANCE_BUCKETS) |
1641 | return NULL; |
1642 | |
1643 | q = nfnl_queue_pernet(net); |
1644 | h = q->instance_table[st->bucket].first; |
1645 | } |
1646 | return h; |
1647 | } |
1648 | |
1649 | static struct hlist_node *get_idx(struct seq_file *seq, loff_t pos) |
1650 | { |
1651 | struct hlist_node *head; |
1652 | head = get_first(seq); |
1653 | |
1654 | if (head) |
1655 | while (pos && (head = get_next(seq, h: head))) |
1656 | pos--; |
1657 | return pos ? NULL : head; |
1658 | } |
1659 | |
1660 | static void *seq_start(struct seq_file *s, loff_t *pos) |
1661 | __acquires(nfnl_queue_pernet(seq_file_net(s))->instances_lock) |
1662 | { |
1663 | spin_lock(lock: &nfnl_queue_pernet(net: seq_file_net(seq: s))->instances_lock); |
1664 | return get_idx(seq: s, pos: *pos); |
1665 | } |
1666 | |
1667 | static void *seq_next(struct seq_file *s, void *v, loff_t *pos) |
1668 | { |
1669 | (*pos)++; |
1670 | return get_next(seq: s, h: v); |
1671 | } |
1672 | |
1673 | static void seq_stop(struct seq_file *s, void *v) |
1674 | __releases(nfnl_queue_pernet(seq_file_net(s))->instances_lock) |
1675 | { |
1676 | spin_unlock(lock: &nfnl_queue_pernet(net: seq_file_net(seq: s))->instances_lock); |
1677 | } |
1678 | |
1679 | static int seq_show(struct seq_file *s, void *v) |
1680 | { |
1681 | const struct nfqnl_instance *inst = v; |
1682 | |
1683 | seq_printf(m: s, fmt: "%5u %6u %5u %1u %5u %5u %5u %8u %2d\n" , |
1684 | inst->queue_num, |
1685 | inst->peer_portid, inst->queue_total, |
1686 | inst->copy_mode, inst->copy_range, |
1687 | inst->queue_dropped, inst->queue_user_dropped, |
1688 | inst->id_sequence, 1); |
1689 | return 0; |
1690 | } |
1691 | |
1692 | static const struct seq_operations nfqnl_seq_ops = { |
1693 | .start = seq_start, |
1694 | .next = seq_next, |
1695 | .stop = seq_stop, |
1696 | .show = seq_show, |
1697 | }; |
1698 | #endif /* PROC_FS */ |
1699 | |
1700 | static int __net_init nfnl_queue_net_init(struct net *net) |
1701 | { |
1702 | unsigned int i; |
1703 | struct nfnl_queue_net *q = nfnl_queue_pernet(net); |
1704 | |
1705 | for (i = 0; i < INSTANCE_BUCKETS; i++) |
1706 | INIT_HLIST_HEAD(&q->instance_table[i]); |
1707 | |
1708 | spin_lock_init(&q->instances_lock); |
1709 | |
1710 | #ifdef CONFIG_PROC_FS |
1711 | if (!proc_create_net("nfnetlink_queue" , 0440, net->nf.proc_netfilter, |
1712 | &nfqnl_seq_ops, sizeof(struct iter_state))) |
1713 | return -ENOMEM; |
1714 | #endif |
1715 | return 0; |
1716 | } |
1717 | |
1718 | static void __net_exit nfnl_queue_net_exit(struct net *net) |
1719 | { |
1720 | struct nfnl_queue_net *q = nfnl_queue_pernet(net); |
1721 | unsigned int i; |
1722 | |
1723 | #ifdef CONFIG_PROC_FS |
1724 | remove_proc_entry("nfnetlink_queue" , net->nf.proc_netfilter); |
1725 | #endif |
1726 | for (i = 0; i < INSTANCE_BUCKETS; i++) |
1727 | WARN_ON_ONCE(!hlist_empty(&q->instance_table[i])); |
1728 | } |
1729 | |
1730 | static struct pernet_operations nfnl_queue_net_ops = { |
1731 | .init = nfnl_queue_net_init, |
1732 | .exit = nfnl_queue_net_exit, |
1733 | .id = &nfnl_queue_net_id, |
1734 | .size = sizeof(struct nfnl_queue_net), |
1735 | }; |
1736 | |
1737 | static int __init nfnetlink_queue_init(void) |
1738 | { |
1739 | int status; |
1740 | |
1741 | status = register_pernet_subsys(&nfnl_queue_net_ops); |
1742 | if (status < 0) { |
1743 | pr_err("failed to register pernet ops\n" ); |
1744 | goto out; |
1745 | } |
1746 | |
1747 | netlink_register_notifier(nb: &nfqnl_rtnl_notifier); |
1748 | status = nfnetlink_subsys_register(n: &nfqnl_subsys); |
1749 | if (status < 0) { |
1750 | pr_err("failed to create netlink socket\n" ); |
1751 | goto cleanup_netlink_notifier; |
1752 | } |
1753 | |
1754 | status = register_netdevice_notifier(nb: &nfqnl_dev_notifier); |
1755 | if (status < 0) { |
1756 | pr_err("failed to register netdevice notifier\n" ); |
1757 | goto cleanup_netlink_subsys; |
1758 | } |
1759 | |
1760 | nf_register_queue_handler(qh: &nfqh); |
1761 | |
1762 | return status; |
1763 | |
1764 | cleanup_netlink_subsys: |
1765 | nfnetlink_subsys_unregister(n: &nfqnl_subsys); |
1766 | cleanup_netlink_notifier: |
1767 | netlink_unregister_notifier(nb: &nfqnl_rtnl_notifier); |
1768 | unregister_pernet_subsys(&nfnl_queue_net_ops); |
1769 | out: |
1770 | return status; |
1771 | } |
1772 | |
1773 | static void __exit nfnetlink_queue_fini(void) |
1774 | { |
1775 | nf_unregister_queue_handler(); |
1776 | unregister_netdevice_notifier(nb: &nfqnl_dev_notifier); |
1777 | nfnetlink_subsys_unregister(n: &nfqnl_subsys); |
1778 | netlink_unregister_notifier(nb: &nfqnl_rtnl_notifier); |
1779 | unregister_pernet_subsys(&nfnl_queue_net_ops); |
1780 | |
1781 | rcu_barrier(); /* Wait for completion of call_rcu()'s */ |
1782 | } |
1783 | |
1784 | MODULE_DESCRIPTION("netfilter packet queue handler" ); |
1785 | MODULE_AUTHOR("Harald Welte <laforge@netfilter.org>" ); |
1786 | MODULE_LICENSE("GPL" ); |
1787 | MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_QUEUE); |
1788 | |
1789 | module_init(nfnetlink_queue_init); |
1790 | module_exit(nfnetlink_queue_fini); |
1791 | |