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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 | ||
5da773a3 FW |
44 | #if IS_ENABLED(CONFIG_NF_CONNTRACK) |
45 | #include <net/netfilter/nf_conntrack.h> | |
46 | #endif | |
47 | ||
7af4cc3f HW |
48 | #define NFQNL_QMAX_DEFAULT 1024 |
49 | ||
9cefbbc9 FW |
50 | /* We're using struct nlattr which has 16bit nla_len. Note that nla_len |
51 | * includes the header length. Thus, the maximum packet length that we | |
52 | * support is 65531 bytes. We send truncated packets if the specified length | |
53 | * is larger than that. Userspace can check for presence of NFQA_CAP_LEN | |
54 | * attribute to detect truncation. | |
55 | */ | |
56 | #define NFQNL_MAX_COPY_RANGE (0xffff - NLA_HDRLEN) | |
57 | ||
7af4cc3f HW |
58 | struct nfqnl_instance { |
59 | struct hlist_node hlist; /* global list of queues */ | |
9872bec7 | 60 | struct rcu_head rcu; |
7af4cc3f | 61 | |
cc6bc448 | 62 | u32 peer_portid; |
7af4cc3f HW |
63 | unsigned int queue_maxlen; |
64 | unsigned int copy_range; | |
7af4cc3f HW |
65 | unsigned int queue_dropped; |
66 | unsigned int queue_user_dropped; | |
67 | ||
7af4cc3f HW |
68 | |
69 | u_int16_t queue_num; /* number of this queue */ | |
70 | u_int8_t copy_mode; | |
fdb694a0 | 71 | u_int32_t flags; /* Set using NFQA_CFG_FLAGS */ |
c463ac97 ED |
72 | /* |
73 | * Following fields are dirtied for each queued packet, | |
74 | * keep them in same cache line if possible. | |
75 | */ | |
886bc503 | 76 | spinlock_t lock ____cacheline_aligned_in_smp; |
c463ac97 | 77 | unsigned int queue_total; |
5863702a | 78 | unsigned int id_sequence; /* 'sequence' of pkt ids */ |
7af4cc3f HW |
79 | struct list_head queue_list; /* packets in queue */ |
80 | }; | |
81 | ||
02f014d8 | 82 | typedef int (*nfqnl_cmpfn)(struct nf_queue_entry *, unsigned long); |
7af4cc3f | 83 | |
c7d03a00 | 84 | static unsigned int nfnl_queue_net_id __read_mostly; |
7af4cc3f | 85 | |
7af4cc3f | 86 | #define INSTANCE_BUCKETS 16 |
e8179610 G |
87 | struct nfnl_queue_net { |
88 | spinlock_t instances_lock; | |
89 | struct hlist_head instance_table[INSTANCE_BUCKETS]; | |
90 | }; | |
91 | ||
92 | static struct nfnl_queue_net *nfnl_queue_pernet(struct net *net) | |
93 | { | |
94 | return net_generic(net, nfnl_queue_net_id); | |
95 | } | |
7af4cc3f HW |
96 | |
97 | static inline u_int8_t instance_hashfn(u_int16_t queue_num) | |
98 | { | |
1cdb0905 | 99 | return ((queue_num >> 8) ^ queue_num) % INSTANCE_BUCKETS; |
7af4cc3f HW |
100 | } |
101 | ||
102 | static struct nfqnl_instance * | |
e8179610 | 103 | instance_lookup(struct nfnl_queue_net *q, u_int16_t queue_num) |
7af4cc3f HW |
104 | { |
105 | struct hlist_head *head; | |
7af4cc3f HW |
106 | struct nfqnl_instance *inst; |
107 | ||
e8179610 | 108 | head = &q->instance_table[instance_hashfn(queue_num)]; |
b67bfe0d | 109 | hlist_for_each_entry_rcu(inst, head, hlist) { |
7af4cc3f HW |
110 | if (inst->queue_num == queue_num) |
111 | return inst; | |
112 | } | |
113 | return NULL; | |
114 | } | |
115 | ||
7af4cc3f | 116 | static struct nfqnl_instance * |
cc6bc448 | 117 | instance_create(struct nfnl_queue_net *q, u_int16_t queue_num, u32 portid) |
7af4cc3f | 118 | { |
baab2ce7 | 119 | struct nfqnl_instance *inst; |
9872bec7 | 120 | unsigned int h; |
baab2ce7 | 121 | int err; |
7af4cc3f | 122 | |
e8179610 G |
123 | spin_lock(&q->instances_lock); |
124 | if (instance_lookup(q, queue_num)) { | |
baab2ce7 | 125 | err = -EEXIST; |
7af4cc3f | 126 | goto out_unlock; |
baab2ce7 | 127 | } |
7af4cc3f | 128 | |
10dfdc69 | 129 | inst = kzalloc(sizeof(*inst), GFP_ATOMIC); |
baab2ce7 PM |
130 | if (!inst) { |
131 | err = -ENOMEM; | |
7af4cc3f | 132 | goto out_unlock; |
baab2ce7 | 133 | } |
7af4cc3f | 134 | |
7af4cc3f | 135 | inst->queue_num = queue_num; |
15e47304 | 136 | inst->peer_portid = portid; |
7af4cc3f | 137 | inst->queue_maxlen = NFQNL_QMAX_DEFAULT; |
9cefbbc9 | 138 | inst->copy_range = NFQNL_MAX_COPY_RANGE; |
7af4cc3f | 139 | inst->copy_mode = NFQNL_COPY_NONE; |
181a46a5 | 140 | spin_lock_init(&inst->lock); |
7af4cc3f HW |
141 | INIT_LIST_HEAD(&inst->queue_list); |
142 | ||
baab2ce7 PM |
143 | if (!try_module_get(THIS_MODULE)) { |
144 | err = -EAGAIN; | |
7af4cc3f | 145 | goto out_free; |
baab2ce7 | 146 | } |
7af4cc3f | 147 | |
9872bec7 | 148 | h = instance_hashfn(queue_num); |
e8179610 | 149 | hlist_add_head_rcu(&inst->hlist, &q->instance_table[h]); |
7af4cc3f | 150 | |
e8179610 | 151 | spin_unlock(&q->instances_lock); |
7af4cc3f | 152 | |
7af4cc3f HW |
153 | return inst; |
154 | ||
155 | out_free: | |
156 | kfree(inst); | |
157 | out_unlock: | |
e8179610 | 158 | spin_unlock(&q->instances_lock); |
baab2ce7 | 159 | return ERR_PTR(err); |
7af4cc3f HW |
160 | } |
161 | ||
b43d8d85 PM |
162 | static void nfqnl_flush(struct nfqnl_instance *queue, nfqnl_cmpfn cmpfn, |
163 | unsigned long data); | |
7af4cc3f HW |
164 | |
165 | static void | |
9872bec7 | 166 | instance_destroy_rcu(struct rcu_head *head) |
7af4cc3f | 167 | { |
9872bec7 PM |
168 | struct nfqnl_instance *inst = container_of(head, struct nfqnl_instance, |
169 | rcu); | |
7af4cc3f | 170 | |
b43d8d85 | 171 | nfqnl_flush(inst, NULL, 0); |
9872bec7 | 172 | kfree(inst); |
7af4cc3f HW |
173 | module_put(THIS_MODULE); |
174 | } | |
175 | ||
9872bec7 | 176 | static void |
7af4cc3f HW |
177 | __instance_destroy(struct nfqnl_instance *inst) |
178 | { | |
9872bec7 PM |
179 | hlist_del_rcu(&inst->hlist); |
180 | call_rcu(&inst->rcu, instance_destroy_rcu); | |
7af4cc3f HW |
181 | } |
182 | ||
9872bec7 | 183 | static void |
e8179610 | 184 | instance_destroy(struct nfnl_queue_net *q, struct nfqnl_instance *inst) |
7af4cc3f | 185 | { |
e8179610 | 186 | spin_lock(&q->instances_lock); |
9872bec7 | 187 | __instance_destroy(inst); |
e8179610 | 188 | spin_unlock(&q->instances_lock); |
7af4cc3f HW |
189 | } |
190 | ||
7af4cc3f | 191 | static inline void |
02f014d8 | 192 | __enqueue_entry(struct nfqnl_instance *queue, struct nf_queue_entry *entry) |
7af4cc3f | 193 | { |
0ac41e81 | 194 | list_add_tail(&entry->list, &queue->queue_list); |
7af4cc3f HW |
195 | queue->queue_total++; |
196 | } | |
197 | ||
97d32cf9 FW |
198 | static void |
199 | __dequeue_entry(struct nfqnl_instance *queue, struct nf_queue_entry *entry) | |
200 | { | |
201 | list_del(&entry->list); | |
202 | queue->queue_total--; | |
203 | } | |
204 | ||
02f014d8 | 205 | static struct nf_queue_entry * |
b43d8d85 | 206 | find_dequeue_entry(struct nfqnl_instance *queue, unsigned int id) |
7af4cc3f | 207 | { |
02f014d8 | 208 | struct nf_queue_entry *entry = NULL, *i; |
601e68e1 | 209 | |
7af4cc3f | 210 | spin_lock_bh(&queue->lock); |
b43d8d85 PM |
211 | |
212 | list_for_each_entry(i, &queue->queue_list, list) { | |
213 | if (i->id == id) { | |
214 | entry = i; | |
215 | break; | |
216 | } | |
217 | } | |
218 | ||
97d32cf9 FW |
219 | if (entry) |
220 | __dequeue_entry(queue, entry); | |
b43d8d85 | 221 | |
7af4cc3f HW |
222 | spin_unlock_bh(&queue->lock); |
223 | ||
224 | return entry; | |
225 | } | |
226 | ||
227 | static void | |
b43d8d85 | 228 | nfqnl_flush(struct nfqnl_instance *queue, nfqnl_cmpfn cmpfn, unsigned long data) |
7af4cc3f | 229 | { |
02f014d8 | 230 | struct nf_queue_entry *entry, *next; |
b43d8d85 | 231 | |
7af4cc3f | 232 | spin_lock_bh(&queue->lock); |
b43d8d85 PM |
233 | list_for_each_entry_safe(entry, next, &queue->queue_list, list) { |
234 | if (!cmpfn || cmpfn(entry, data)) { | |
235 | list_del(&entry->list); | |
236 | queue->queue_total--; | |
4b3d15ef | 237 | nf_reinject(entry, NF_DROP); |
b43d8d85 PM |
238 | } |
239 | } | |
7af4cc3f HW |
240 | spin_unlock_bh(&queue->lock); |
241 | } | |
242 | ||
496e4ae7 FW |
243 | static int |
244 | nfqnl_put_packet_info(struct sk_buff *nlskb, struct sk_buff *packet, | |
245 | bool csum_verify) | |
7237190d FW |
246 | { |
247 | __u32 flags = 0; | |
248 | ||
249 | if (packet->ip_summed == CHECKSUM_PARTIAL) | |
250 | flags = NFQA_SKB_CSUMNOTREADY; | |
496e4ae7 FW |
251 | else if (csum_verify) |
252 | flags = NFQA_SKB_CSUM_NOTVERIFIED; | |
253 | ||
7237190d FW |
254 | if (skb_is_gso(packet)) |
255 | flags |= NFQA_SKB_GSO; | |
256 | ||
257 | return flags ? nla_put_be32(nlskb, NFQA_SKB_INFO, htonl(flags)) : 0; | |
258 | } | |
259 | ||
08c0cad6 VG |
260 | static int nfqnl_put_sk_uidgid(struct sk_buff *skb, struct sock *sk) |
261 | { | |
262 | const struct cred *cred; | |
263 | ||
a8399231 | 264 | if (!sk_fullsock(sk)) |
08c0cad6 VG |
265 | return 0; |
266 | ||
267 | read_lock_bh(&sk->sk_callback_lock); | |
268 | if (sk->sk_socket && sk->sk_socket->file) { | |
269 | cred = sk->sk_socket->file->f_cred; | |
270 | if (nla_put_be32(skb, NFQA_UID, | |
271 | htonl(from_kuid_munged(&init_user_ns, cred->fsuid)))) | |
272 | goto nla_put_failure; | |
273 | if (nla_put_be32(skb, NFQA_GID, | |
274 | htonl(from_kgid_munged(&init_user_ns, cred->fsgid)))) | |
275 | goto nla_put_failure; | |
276 | } | |
277 | read_unlock_bh(&sk->sk_callback_lock); | |
278 | return 0; | |
279 | ||
280 | nla_put_failure: | |
281 | read_unlock_bh(&sk->sk_callback_lock); | |
282 | return -1; | |
283 | } | |
284 | ||
ef493bd9 RK |
285 | static u32 nfqnl_get_sk_secctx(struct sk_buff *skb, char **secdata) |
286 | { | |
287 | u32 seclen = 0; | |
288 | #if IS_ENABLED(CONFIG_NETWORK_SECMARK) | |
289 | if (!skb || !sk_fullsock(skb->sk)) | |
290 | return 0; | |
291 | ||
292 | read_lock_bh(&skb->sk->sk_callback_lock); | |
293 | ||
294 | if (skb->secmark) | |
295 | security_secid_to_secctx(skb->secmark, secdata, &seclen); | |
296 | ||
297 | read_unlock_bh(&skb->sk->sk_callback_lock); | |
298 | #endif | |
299 | return seclen; | |
300 | } | |
301 | ||
15824ab2 SB |
302 | static u32 nfqnl_get_bridge_size(struct nf_queue_entry *entry) |
303 | { | |
304 | struct sk_buff *entskb = entry->skb; | |
305 | u32 nlalen = 0; | |
306 | ||
307 | if (entry->state.pf != PF_BRIDGE || !skb_mac_header_was_set(entskb)) | |
308 | return 0; | |
309 | ||
310 | if (skb_vlan_tag_present(entskb)) | |
311 | nlalen += nla_total_size(nla_total_size(sizeof(__be16)) + | |
312 | nla_total_size(sizeof(__be16))); | |
313 | ||
314 | if (entskb->network_header > entskb->mac_header) | |
315 | nlalen += nla_total_size((entskb->network_header - | |
316 | entskb->mac_header)); | |
317 | ||
318 | return nlalen; | |
319 | } | |
320 | ||
321 | static int nfqnl_put_bridge(struct nf_queue_entry *entry, struct sk_buff *skb) | |
322 | { | |
323 | struct sk_buff *entskb = entry->skb; | |
324 | ||
325 | if (entry->state.pf != PF_BRIDGE || !skb_mac_header_was_set(entskb)) | |
326 | return 0; | |
327 | ||
328 | if (skb_vlan_tag_present(entskb)) { | |
329 | struct nlattr *nest; | |
330 | ||
331 | nest = nla_nest_start(skb, NFQA_VLAN | NLA_F_NESTED); | |
332 | if (!nest) | |
333 | goto nla_put_failure; | |
334 | ||
335 | if (nla_put_be16(skb, NFQA_VLAN_TCI, htons(entskb->vlan_tci)) || | |
336 | nla_put_be16(skb, NFQA_VLAN_PROTO, entskb->vlan_proto)) | |
337 | goto nla_put_failure; | |
338 | ||
339 | nla_nest_end(skb, nest); | |
340 | } | |
341 | ||
342 | if (entskb->mac_header < entskb->network_header) { | |
343 | int len = (int)(entskb->network_header - entskb->mac_header); | |
344 | ||
345 | if (nla_put(skb, NFQA_L2HDR, len, skb_mac_header(entskb))) | |
346 | goto nla_put_failure; | |
347 | } | |
348 | ||
349 | return 0; | |
350 | ||
351 | nla_put_failure: | |
352 | return -1; | |
353 | } | |
354 | ||
7af4cc3f | 355 | static struct sk_buff * |
74332687 | 356 | nfqnl_build_packet_message(struct net *net, struct nfqnl_instance *queue, |
5863702a ED |
357 | struct nf_queue_entry *entry, |
358 | __be32 **packet_id_ptr) | |
7af4cc3f | 359 | { |
7af4cc3f | 360 | size_t size; |
c5b0db32 | 361 | size_t data_len = 0, cap_len = 0; |
af2806f8 | 362 | unsigned int hlen = 0; |
7af4cc3f | 363 | struct sk_buff *skb; |
5863702a ED |
364 | struct nlattr *nla; |
365 | struct nfqnl_msg_packet_hdr *pmsg; | |
7af4cc3f HW |
366 | struct nlmsghdr *nlh; |
367 | struct nfgenmsg *nfmsg; | |
3e4ead4f JJ |
368 | struct sk_buff *entskb = entry->skb; |
369 | struct net_device *indev; | |
370 | struct net_device *outdev; | |
9cb01766 PNA |
371 | struct nf_conn *ct = NULL; |
372 | enum ip_conntrack_info uninitialized_var(ctinfo); | |
a4b4766c | 373 | struct nfnl_ct_hook *nfnl_ct; |
496e4ae7 | 374 | bool csum_verify; |
ef493bd9 RK |
375 | char *secdata = NULL; |
376 | u32 seclen = 0; | |
7af4cc3f | 377 | |
573ce260 | 378 | size = nlmsg_total_size(sizeof(struct nfgenmsg)) |
df6fb868 PM |
379 | + nla_total_size(sizeof(struct nfqnl_msg_packet_hdr)) |
380 | + nla_total_size(sizeof(u_int32_t)) /* ifindex */ | |
381 | + nla_total_size(sizeof(u_int32_t)) /* ifindex */ | |
1109a90c | 382 | #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER) |
df6fb868 PM |
383 | + nla_total_size(sizeof(u_int32_t)) /* ifindex */ |
384 | + nla_total_size(sizeof(u_int32_t)) /* ifindex */ | |
fbcd923c | 385 | #endif |
df6fb868 PM |
386 | + nla_total_size(sizeof(u_int32_t)) /* mark */ |
387 | + nla_total_size(sizeof(struct nfqnl_msg_packet_hw)) | |
7237190d | 388 | + nla_total_size(sizeof(u_int32_t)) /* skbinfo */ |
ae08ce00 ED |
389 | + nla_total_size(sizeof(u_int32_t)); /* cap_len */ |
390 | ||
2456e855 | 391 | if (entskb->tstamp) |
ae08ce00 | 392 | size += nla_total_size(sizeof(struct nfqnl_msg_packet_timestamp)); |
7af4cc3f | 393 | |
15824ab2 SB |
394 | size += nfqnl_get_bridge_size(entry); |
395 | ||
1d1de89b DM |
396 | if (entry->state.hook <= NF_INET_FORWARD || |
397 | (entry->state.hook == NF_INET_POST_ROUTING && entskb->sk == NULL)) | |
496e4ae7 FW |
398 | csum_verify = !skb_csum_unnecessary(entskb); |
399 | else | |
400 | csum_verify = false; | |
401 | ||
1d1de89b | 402 | outdev = entry->state.out; |
3e4ead4f | 403 | |
14cd5d4a | 404 | switch ((enum nfqnl_config_mode)READ_ONCE(queue->copy_mode)) { |
7af4cc3f HW |
405 | case NFQNL_COPY_META: |
406 | case NFQNL_COPY_NONE: | |
7af4cc3f | 407 | break; |
601e68e1 | 408 | |
7af4cc3f | 409 | case NFQNL_COPY_PACKET: |
00bd1cc2 FW |
410 | if (!(queue->flags & NFQA_CFG_F_GSO) && |
411 | entskb->ip_summed == CHECKSUM_PARTIAL && | |
c463ac97 | 412 | skb_checksum_help(entskb)) |
e7dfb09a | 413 | return NULL; |
c463ac97 | 414 | |
14cd5d4a | 415 | data_len = READ_ONCE(queue->copy_range); |
9cefbbc9 | 416 | if (data_len > entskb->len) |
3e4ead4f | 417 | data_len = entskb->len; |
601e68e1 | 418 | |
af2806f8 TG |
419 | hlen = skb_zerocopy_headlen(entskb); |
420 | hlen = min_t(unsigned int, hlen, data_len); | |
ae08ce00 | 421 | size += sizeof(struct nlattr) + hlen; |
6ee584be | 422 | cap_len = entskb->len; |
7af4cc3f | 423 | break; |
7af4cc3f HW |
424 | } |
425 | ||
8e662164 AB |
426 | nfnl_ct = rcu_dereference(nfnl_ct_hook); |
427 | ||
b7bd1809 | 428 | if (queue->flags & NFQA_CFG_F_CONNTRACK) { |
a4b4766c KM |
429 | if (nfnl_ct != NULL) { |
430 | ct = nfnl_ct->get_ct(entskb, &ctinfo); | |
b7bd1809 | 431 | if (ct != NULL) |
a4b4766c | 432 | size += nfnl_ct->build_size(ct); |
b7bd1809 PNA |
433 | } |
434 | } | |
7af4cc3f | 435 | |
08c0cad6 VG |
436 | if (queue->flags & NFQA_CFG_F_UID_GID) { |
437 | size += (nla_total_size(sizeof(u_int32_t)) /* uid */ | |
438 | + nla_total_size(sizeof(u_int32_t))); /* gid */ | |
439 | } | |
440 | ||
ef493bd9 RK |
441 | if ((queue->flags & NFQA_CFG_F_SECCTX) && entskb->sk) { |
442 | seclen = nfqnl_get_sk_secctx(entskb, &secdata); | |
443 | if (seclen) | |
444 | size += nla_total_size(seclen); | |
445 | } | |
446 | ||
c5b0db32 | 447 | skb = alloc_skb(size, GFP_ATOMIC); |
36d5fe6a ZK |
448 | if (!skb) { |
449 | skb_tx_error(entskb); | |
77c1c03c | 450 | goto nlmsg_failure; |
36d5fe6a | 451 | } |
601e68e1 | 452 | |
3da07c0c | 453 | nlh = nlmsg_put(skb, 0, 0, |
dedb67c4 | 454 | nfnl_msg_type(NFNL_SUBSYS_QUEUE, NFQNL_MSG_PACKET), |
3da07c0c DM |
455 | sizeof(struct nfgenmsg), 0); |
456 | if (!nlh) { | |
36d5fe6a | 457 | skb_tx_error(entskb); |
3da07c0c | 458 | kfree_skb(skb); |
77c1c03c | 459 | goto nlmsg_failure; |
3da07c0c DM |
460 | } |
461 | nfmsg = nlmsg_data(nlh); | |
1d1de89b | 462 | nfmsg->nfgen_family = entry->state.pf; |
7af4cc3f HW |
463 | nfmsg->version = NFNETLINK_V0; |
464 | nfmsg->res_id = htons(queue->queue_num); | |
465 | ||
5863702a ED |
466 | nla = __nla_reserve(skb, NFQA_PACKET_HDR, sizeof(*pmsg)); |
467 | pmsg = nla_data(nla); | |
468 | pmsg->hw_protocol = entskb->protocol; | |
1d1de89b | 469 | pmsg->hook = entry->state.hook; |
5863702a | 470 | *packet_id_ptr = &pmsg->packet_id; |
7af4cc3f | 471 | |
1d1de89b | 472 | indev = entry->state.in; |
3e4ead4f | 473 | if (indev) { |
1109a90c | 474 | #if !IS_ENABLED(CONFIG_BRIDGE_NETFILTER) |
a447189e DM |
475 | if (nla_put_be32(skb, NFQA_IFINDEX_INDEV, htonl(indev->ifindex))) |
476 | goto nla_put_failure; | |
fbcd923c | 477 | #else |
1d1de89b | 478 | if (entry->state.pf == PF_BRIDGE) { |
fbcd923c | 479 | /* Case 1: indev is physical input device, we need to |
601e68e1 | 480 | * look for bridge group (when called from |
fbcd923c | 481 | * netfilter_bridge) */ |
a447189e DM |
482 | if (nla_put_be32(skb, NFQA_IFINDEX_PHYSINDEV, |
483 | htonl(indev->ifindex)) || | |
fbcd923c | 484 | /* this is the bridge group "brX" */ |
f350a0a8 | 485 | /* rcu_read_lock()ed by __nf_queue */ |
a447189e DM |
486 | nla_put_be32(skb, NFQA_IFINDEX_INDEV, |
487 | htonl(br_port_get_rcu(indev)->br->dev->ifindex))) | |
488 | goto nla_put_failure; | |
fbcd923c | 489 | } else { |
c737b7c4 FW |
490 | int physinif; |
491 | ||
fbcd923c HW |
492 | /* Case 2: indev is bridge group, we need to look for |
493 | * physical device (when called from ipv4) */ | |
a447189e DM |
494 | if (nla_put_be32(skb, NFQA_IFINDEX_INDEV, |
495 | htonl(indev->ifindex))) | |
496 | goto nla_put_failure; | |
c737b7c4 FW |
497 | |
498 | physinif = nf_bridge_get_physinif(entskb); | |
499 | if (physinif && | |
a447189e | 500 | nla_put_be32(skb, NFQA_IFINDEX_PHYSINDEV, |
c737b7c4 | 501 | htonl(physinif))) |
a447189e | 502 | goto nla_put_failure; |
fbcd923c HW |
503 | } |
504 | #endif | |
7af4cc3f HW |
505 | } |
506 | ||
3e4ead4f | 507 | if (outdev) { |
1109a90c | 508 | #if !IS_ENABLED(CONFIG_BRIDGE_NETFILTER) |
a447189e DM |
509 | if (nla_put_be32(skb, NFQA_IFINDEX_OUTDEV, htonl(outdev->ifindex))) |
510 | goto nla_put_failure; | |
fbcd923c | 511 | #else |
1d1de89b | 512 | if (entry->state.pf == PF_BRIDGE) { |
fbcd923c | 513 | /* Case 1: outdev is physical output device, we need to |
601e68e1 | 514 | * look for bridge group (when called from |
fbcd923c | 515 | * netfilter_bridge) */ |
a447189e DM |
516 | if (nla_put_be32(skb, NFQA_IFINDEX_PHYSOUTDEV, |
517 | htonl(outdev->ifindex)) || | |
fbcd923c | 518 | /* this is the bridge group "brX" */ |
f350a0a8 | 519 | /* rcu_read_lock()ed by __nf_queue */ |
a447189e DM |
520 | nla_put_be32(skb, NFQA_IFINDEX_OUTDEV, |
521 | htonl(br_port_get_rcu(outdev)->br->dev->ifindex))) | |
522 | goto nla_put_failure; | |
fbcd923c | 523 | } else { |
c737b7c4 FW |
524 | int physoutif; |
525 | ||
fbcd923c HW |
526 | /* Case 2: outdev is bridge group, we need to look for |
527 | * physical output device (when called from ipv4) */ | |
a447189e DM |
528 | if (nla_put_be32(skb, NFQA_IFINDEX_OUTDEV, |
529 | htonl(outdev->ifindex))) | |
530 | goto nla_put_failure; | |
c737b7c4 FW |
531 | |
532 | physoutif = nf_bridge_get_physoutif(entskb); | |
533 | if (physoutif && | |
a447189e | 534 | nla_put_be32(skb, NFQA_IFINDEX_PHYSOUTDEV, |
c737b7c4 | 535 | htonl(physoutif))) |
a447189e | 536 | goto nla_put_failure; |
fbcd923c HW |
537 | } |
538 | #endif | |
7af4cc3f HW |
539 | } |
540 | ||
a447189e DM |
541 | if (entskb->mark && |
542 | nla_put_be32(skb, NFQA_MARK, htonl(entskb->mark))) | |
543 | goto nla_put_failure; | |
7af4cc3f | 544 | |
2c38de4c NC |
545 | if (indev && entskb->dev && |
546 | entskb->mac_header != entskb->network_header) { | |
7af4cc3f | 547 | struct nfqnl_msg_packet_hw phw; |
e4d091d7 DC |
548 | int len; |
549 | ||
550 | memset(&phw, 0, sizeof(phw)); | |
551 | len = dev_parse_header(entskb, phw.hw_addr); | |
b95cce35 SH |
552 | if (len) { |
553 | phw.hw_addrlen = htons(len); | |
a447189e DM |
554 | if (nla_put(skb, NFQA_HWADDR, sizeof(phw), &phw)) |
555 | goto nla_put_failure; | |
b95cce35 | 556 | } |
7af4cc3f HW |
557 | } |
558 | ||
15824ab2 SB |
559 | if (nfqnl_put_bridge(entry, skb) < 0) |
560 | goto nla_put_failure; | |
561 | ||
2456e855 | 562 | if (entskb->tstamp) { |
7af4cc3f | 563 | struct nfqnl_msg_packet_timestamp ts; |
a7f18845 | 564 | struct timespec64 kts = ktime_to_timespec64(entskb->tstamp); |
b28b1e82 PNA |
565 | |
566 | ts.sec = cpu_to_be64(kts.tv_sec); | |
567 | ts.usec = cpu_to_be64(kts.tv_nsec / NSEC_PER_USEC); | |
7af4cc3f | 568 | |
a447189e DM |
569 | if (nla_put(skb, NFQA_TIMESTAMP, sizeof(ts), &ts)) |
570 | goto nla_put_failure; | |
7af4cc3f HW |
571 | } |
572 | ||
08c0cad6 VG |
573 | if ((queue->flags & NFQA_CFG_F_UID_GID) && entskb->sk && |
574 | nfqnl_put_sk_uidgid(skb, entskb->sk) < 0) | |
575 | goto nla_put_failure; | |
576 | ||
ef493bd9 RK |
577 | if (seclen && nla_put(skb, NFQA_SECCTX, seclen, secdata)) |
578 | goto nla_put_failure; | |
579 | ||
a4b4766c | 580 | if (ct && nfnl_ct->build(skb, ct, ctinfo, NFQA_CT, NFQA_CT_INFO) < 0) |
ae08ce00 ED |
581 | goto nla_put_failure; |
582 | ||
7f87712c FW |
583 | if (cap_len > data_len && |
584 | nla_put_be32(skb, NFQA_CAP_LEN, htonl(cap_len))) | |
ae08ce00 ED |
585 | goto nla_put_failure; |
586 | ||
496e4ae7 | 587 | if (nfqnl_put_packet_info(skb, entskb, csum_verify)) |
7237190d FW |
588 | goto nla_put_failure; |
589 | ||
7af4cc3f | 590 | if (data_len) { |
df6fb868 | 591 | struct nlattr *nla; |
7af4cc3f | 592 | |
ae08ce00 ED |
593 | if (skb_tailroom(skb) < sizeof(*nla) + hlen) |
594 | goto nla_put_failure; | |
7af4cc3f | 595 | |
4df864c1 | 596 | nla = skb_put(skb, sizeof(*nla)); |
df6fb868 | 597 | nla->nla_type = NFQA_PAYLOAD; |
ae08ce00 | 598 | nla->nla_len = nla_attr_size(data_len); |
7af4cc3f | 599 | |
36d5fe6a ZK |
600 | if (skb_zerocopy(skb, entskb, data_len, hlen)) |
601 | goto nla_put_failure; | |
7af4cc3f | 602 | } |
601e68e1 | 603 | |
ae08ce00 | 604 | nlh->nlmsg_len = skb->len; |
77c1c03c LZ |
605 | if (seclen) |
606 | security_release_secctx(secdata, seclen); | |
7af4cc3f HW |
607 | return skb; |
608 | ||
df6fb868 | 609 | nla_put_failure: |
36d5fe6a | 610 | skb_tx_error(entskb); |
a6729955 | 611 | kfree_skb(skb); |
e87cc472 | 612 | net_err_ratelimited("nf_queue: error creating packet message\n"); |
77c1c03c LZ |
613 | nlmsg_failure: |
614 | if (seclen) | |
615 | security_release_secctx(secdata, seclen); | |
7af4cc3f HW |
616 | return NULL; |
617 | } | |
618 | ||
5da773a3 FW |
619 | static bool nf_ct_drop_unconfirmed(const struct nf_queue_entry *entry) |
620 | { | |
621 | #if IS_ENABLED(CONFIG_NF_CONNTRACK) | |
622 | static const unsigned long flags = IPS_CONFIRMED | IPS_DYING; | |
623 | const struct nf_conn *ct = (void *)skb_nfct(entry->skb); | |
624 | ||
625 | if (ct && ((ct->status & flags) == IPS_DYING)) | |
626 | return true; | |
627 | #endif | |
628 | return false; | |
629 | } | |
630 | ||
7af4cc3f | 631 | static int |
a5fedd43 FW |
632 | __nfqnl_enqueue_packet(struct net *net, struct nfqnl_instance *queue, |
633 | struct nf_queue_entry *entry) | |
7af4cc3f | 634 | { |
7af4cc3f | 635 | struct sk_buff *nskb; |
f1585086 | 636 | int err = -ENOBUFS; |
5863702a | 637 | __be32 *packet_id_ptr; |
fdb694a0 | 638 | int failopen = 0; |
7af4cc3f | 639 | |
74332687 | 640 | nskb = nfqnl_build_packet_message(net, queue, entry, &packet_id_ptr); |
f1585086 FW |
641 | if (nskb == NULL) { |
642 | err = -ENOMEM; | |
0ef0f465 | 643 | goto err_out; |
f1585086 | 644 | } |
7af4cc3f | 645 | spin_lock_bh(&queue->lock); |
601e68e1 | 646 | |
5da773a3 FW |
647 | if (nf_ct_drop_unconfirmed(entry)) |
648 | goto err_out_free_nskb; | |
649 | ||
7af4cc3f | 650 | if (queue->queue_total >= queue->queue_maxlen) { |
fdb694a0 KK |
651 | if (queue->flags & NFQA_CFG_F_FAIL_OPEN) { |
652 | failopen = 1; | |
653 | err = 0; | |
654 | } else { | |
655 | queue->queue_dropped++; | |
656 | net_warn_ratelimited("nf_queue: full at %d entries, dropping packets(s)\n", | |
657 | queue->queue_total); | |
658 | } | |
7af4cc3f HW |
659 | goto err_out_free_nskb; |
660 | } | |
5863702a ED |
661 | entry->id = ++queue->id_sequence; |
662 | *packet_id_ptr = htonl(entry->id); | |
7af4cc3f HW |
663 | |
664 | /* nfnetlink_unicast will either free the nskb or add it to a socket */ | |
e8179610 | 665 | err = nfnetlink_unicast(nskb, net, queue->peer_portid, MSG_DONTWAIT); |
0ef0f465 | 666 | if (err < 0) { |
93140113 PNA |
667 | if (queue->flags & NFQA_CFG_F_FAIL_OPEN) { |
668 | failopen = 1; | |
669 | err = 0; | |
670 | } else { | |
671 | queue->queue_user_dropped++; | |
672 | } | |
7af4cc3f HW |
673 | goto err_out_unlock; |
674 | } | |
675 | ||
676 | __enqueue_entry(queue, entry); | |
677 | ||
678 | spin_unlock_bh(&queue->lock); | |
0ef0f465 | 679 | return 0; |
7af4cc3f HW |
680 | |
681 | err_out_free_nskb: | |
601e68e1 | 682 | kfree_skb(nskb); |
7af4cc3f HW |
683 | err_out_unlock: |
684 | spin_unlock_bh(&queue->lock); | |
fdb694a0 KK |
685 | if (failopen) |
686 | nf_reinject(entry, NF_ACCEPT); | |
0ef0f465 | 687 | err_out: |
f1585086 | 688 | return err; |
7af4cc3f HW |
689 | } |
690 | ||
a5fedd43 FW |
691 | static struct nf_queue_entry * |
692 | nf_queue_entry_dup(struct nf_queue_entry *e) | |
693 | { | |
694 | struct nf_queue_entry *entry = kmemdup(e, e->size, GFP_ATOMIC); | |
ed78d09d FW |
695 | if (entry) |
696 | nf_queue_entry_get_refs(entry); | |
697 | return entry; | |
a5fedd43 FW |
698 | } |
699 | ||
1109a90c | 700 | #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER) |
a5fedd43 FW |
701 | /* When called from bridge netfilter, skb->data must point to MAC header |
702 | * before calling skb_gso_segment(). Else, original MAC header is lost | |
703 | * and segmented skbs will be sent to wrong destination. | |
704 | */ | |
705 | static void nf_bridge_adjust_skb_data(struct sk_buff *skb) | |
706 | { | |
707 | if (skb->nf_bridge) | |
708 | __skb_push(skb, skb->network_header - skb->mac_header); | |
709 | } | |
710 | ||
711 | static void nf_bridge_adjust_segmented_data(struct sk_buff *skb) | |
712 | { | |
713 | if (skb->nf_bridge) | |
714 | __skb_pull(skb, skb->network_header - skb->mac_header); | |
715 | } | |
716 | #else | |
717 | #define nf_bridge_adjust_skb_data(s) do {} while (0) | |
718 | #define nf_bridge_adjust_segmented_data(s) do {} while (0) | |
719 | #endif | |
720 | ||
721 | static void free_entry(struct nf_queue_entry *entry) | |
722 | { | |
723 | nf_queue_entry_release_refs(entry); | |
724 | kfree(entry); | |
725 | } | |
726 | ||
727 | static int | |
728 | __nfqnl_enqueue_packet_gso(struct net *net, struct nfqnl_instance *queue, | |
729 | struct sk_buff *skb, struct nf_queue_entry *entry) | |
730 | { | |
731 | int ret = -ENOMEM; | |
732 | struct nf_queue_entry *entry_seg; | |
733 | ||
734 | nf_bridge_adjust_segmented_data(skb); | |
735 | ||
736 | if (skb->next == NULL) { /* last packet, no need to copy entry */ | |
737 | struct sk_buff *gso_skb = entry->skb; | |
738 | entry->skb = skb; | |
739 | ret = __nfqnl_enqueue_packet(net, queue, entry); | |
740 | if (ret) | |
741 | entry->skb = gso_skb; | |
742 | return ret; | |
743 | } | |
744 | ||
745 | skb->next = NULL; | |
746 | ||
747 | entry_seg = nf_queue_entry_dup(entry); | |
748 | if (entry_seg) { | |
749 | entry_seg->skb = skb; | |
750 | ret = __nfqnl_enqueue_packet(net, queue, entry_seg); | |
751 | if (ret) | |
752 | free_entry(entry_seg); | |
753 | } | |
754 | return ret; | |
755 | } | |
756 | ||
757 | static int | |
758 | nfqnl_enqueue_packet(struct nf_queue_entry *entry, unsigned int queuenum) | |
759 | { | |
760 | unsigned int queued; | |
761 | struct nfqnl_instance *queue; | |
762 | struct sk_buff *skb, *segs; | |
763 | int err = -ENOBUFS; | |
9dff2c96 | 764 | struct net *net = entry->state.net; |
a5fedd43 FW |
765 | struct nfnl_queue_net *q = nfnl_queue_pernet(net); |
766 | ||
e2361cb9 | 767 | /* rcu_read_lock()ed by nf_hook_thresh */ |
a5fedd43 FW |
768 | queue = instance_lookup(q, queuenum); |
769 | if (!queue) | |
770 | return -ESRCH; | |
771 | ||
772 | if (queue->copy_mode == NFQNL_COPY_NONE) | |
773 | return -EINVAL; | |
774 | ||
a5fedd43 FW |
775 | skb = entry->skb; |
776 | ||
1d1de89b | 777 | switch (entry->state.pf) { |
a5fedd43 FW |
778 | case NFPROTO_IPV4: |
779 | skb->protocol = htons(ETH_P_IP); | |
780 | break; | |
781 | case NFPROTO_IPV6: | |
782 | skb->protocol = htons(ETH_P_IPV6); | |
783 | break; | |
784 | } | |
785 | ||
7b8dfe28 PNA |
786 | if ((queue->flags & NFQA_CFG_F_GSO) || !skb_is_gso(skb)) |
787 | return __nfqnl_enqueue_packet(net, queue, entry); | |
788 | ||
a5fedd43 FW |
789 | nf_bridge_adjust_skb_data(skb); |
790 | segs = skb_gso_segment(skb, 0); | |
791 | /* Does not use PTR_ERR to limit the number of error codes that can be | |
ed78d09d | 792 | * returned by nf_queue. For instance, callers rely on -ESRCH to |
a5fedd43 FW |
793 | * mean 'ignore this hook'. |
794 | */ | |
330966e5 | 795 | if (IS_ERR_OR_NULL(segs)) |
a5fedd43 FW |
796 | goto out_err; |
797 | queued = 0; | |
798 | err = 0; | |
799 | do { | |
800 | struct sk_buff *nskb = segs->next; | |
801 | if (err == 0) | |
802 | err = __nfqnl_enqueue_packet_gso(net, queue, | |
803 | segs, entry); | |
804 | if (err == 0) | |
805 | queued++; | |
806 | else | |
807 | kfree_skb(segs); | |
808 | segs = nskb; | |
809 | } while (segs); | |
810 | ||
811 | if (queued) { | |
812 | if (err) /* some segments are already queued */ | |
813 | free_entry(entry); | |
814 | kfree_skb(skb); | |
815 | return 0; | |
816 | } | |
817 | out_err: | |
818 | nf_bridge_adjust_segmented_data(skb); | |
819 | return err; | |
820 | } | |
821 | ||
7af4cc3f | 822 | static int |
8c88f87c | 823 | nfqnl_mangle(void *data, int data_len, struct nf_queue_entry *e, int diff) |
7af4cc3f | 824 | { |
e2b58a67 | 825 | struct sk_buff *nskb; |
7af4cc3f | 826 | |
d8a585d7 PM |
827 | if (diff < 0) { |
828 | if (pskb_trim(e->skb, data_len)) | |
829 | return -ENOMEM; | |
830 | } else if (diff > 0) { | |
7af4cc3f HW |
831 | if (data_len > 0xFFFF) |
832 | return -EINVAL; | |
833 | if (diff > skb_tailroom(e->skb)) { | |
9a732ed6 AE |
834 | nskb = skb_copy_expand(e->skb, skb_headroom(e->skb), |
835 | diff, GFP_ATOMIC); | |
e2b58a67 | 836 | if (!nskb) { |
1158ba27 | 837 | printk(KERN_WARNING "nf_queue: OOM " |
7af4cc3f | 838 | "in mangle, dropping packet\n"); |
e2b58a67 | 839 | return -ENOMEM; |
7af4cc3f | 840 | } |
e2b58a67 PM |
841 | kfree_skb(e->skb); |
842 | e->skb = nskb; | |
7af4cc3f HW |
843 | } |
844 | skb_put(e->skb, diff); | |
845 | } | |
37d41879 | 846 | if (!skb_make_writable(e->skb, data_len)) |
7af4cc3f | 847 | return -ENOMEM; |
27d7ff46 | 848 | skb_copy_to_linear_data(e->skb, data, data_len); |
e7dfb09a | 849 | e->skb->ip_summed = CHECKSUM_NONE; |
7af4cc3f HW |
850 | return 0; |
851 | } | |
852 | ||
7af4cc3f HW |
853 | static int |
854 | nfqnl_set_mode(struct nfqnl_instance *queue, | |
855 | unsigned char mode, unsigned int range) | |
856 | { | |
c5de0dfd | 857 | int status = 0; |
7af4cc3f HW |
858 | |
859 | spin_lock_bh(&queue->lock); | |
c5de0dfd PM |
860 | switch (mode) { |
861 | case NFQNL_COPY_NONE: | |
862 | case NFQNL_COPY_META: | |
863 | queue->copy_mode = mode; | |
864 | queue->copy_range = 0; | |
865 | break; | |
866 | ||
867 | case NFQNL_COPY_PACKET: | |
868 | queue->copy_mode = mode; | |
9cefbbc9 FW |
869 | if (range == 0 || range > NFQNL_MAX_COPY_RANGE) |
870 | queue->copy_range = NFQNL_MAX_COPY_RANGE; | |
c5de0dfd PM |
871 | else |
872 | queue->copy_range = range; | |
873 | break; | |
874 | ||
875 | default: | |
876 | status = -EINVAL; | |
877 | ||
878 | } | |
7af4cc3f HW |
879 | spin_unlock_bh(&queue->lock); |
880 | ||
881 | return status; | |
882 | } | |
883 | ||
884 | static int | |
02f014d8 | 885 | dev_cmp(struct nf_queue_entry *entry, unsigned long ifindex) |
7af4cc3f | 886 | { |
1d1de89b DM |
887 | if (entry->state.in) |
888 | if (entry->state.in->ifindex == ifindex) | |
7af4cc3f | 889 | return 1; |
1d1de89b DM |
890 | if (entry->state.out) |
891 | if (entry->state.out->ifindex == ifindex) | |
7af4cc3f | 892 | return 1; |
1109a90c | 893 | #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER) |
ef47c6a7 | 894 | if (entry->skb->nf_bridge) { |
c737b7c4 FW |
895 | int physinif, physoutif; |
896 | ||
897 | physinif = nf_bridge_get_physinif(entry->skb); | |
898 | physoutif = nf_bridge_get_physoutif(entry->skb); | |
899 | ||
900 | if (physinif == ifindex || physoutif == ifindex) | |
ef47c6a7 PM |
901 | return 1; |
902 | } | |
903 | #endif | |
7af4cc3f HW |
904 | return 0; |
905 | } | |
906 | ||
907 | /* drop all packets with either indev or outdev == ifindex from all queue | |
908 | * instances */ | |
909 | static void | |
e8179610 | 910 | nfqnl_dev_drop(struct net *net, int ifindex) |
7af4cc3f HW |
911 | { |
912 | int i; | |
e8179610 | 913 | struct nfnl_queue_net *q = nfnl_queue_pernet(net); |
601e68e1 | 914 | |
9872bec7 | 915 | rcu_read_lock(); |
7af4cc3f | 916 | |
9872bec7 | 917 | for (i = 0; i < INSTANCE_BUCKETS; i++) { |
7af4cc3f | 918 | struct nfqnl_instance *inst; |
e8179610 | 919 | struct hlist_head *head = &q->instance_table[i]; |
7af4cc3f | 920 | |
b67bfe0d | 921 | hlist_for_each_entry_rcu(inst, head, hlist) |
b43d8d85 | 922 | nfqnl_flush(inst, dev_cmp, ifindex); |
7af4cc3f HW |
923 | } |
924 | ||
9872bec7 | 925 | rcu_read_unlock(); |
7af4cc3f HW |
926 | } |
927 | ||
7af4cc3f HW |
928 | static int |
929 | nfqnl_rcv_dev_event(struct notifier_block *this, | |
930 | unsigned long event, void *ptr) | |
931 | { | |
351638e7 | 932 | struct net_device *dev = netdev_notifier_info_to_dev(ptr); |
7af4cc3f HW |
933 | |
934 | /* Drop any packets associated with the downed device */ | |
935 | if (event == NETDEV_DOWN) | |
e8179610 | 936 | nfqnl_dev_drop(dev_net(dev), dev->ifindex); |
7af4cc3f HW |
937 | return NOTIFY_DONE; |
938 | } | |
939 | ||
940 | static struct notifier_block nfqnl_dev_notifier = { | |
941 | .notifier_call = nfqnl_rcv_dev_event, | |
942 | }; | |
943 | ||
039b40ee | 944 | static unsigned int nfqnl_nf_hook_drop(struct net *net) |
8405a8ff EB |
945 | { |
946 | struct nfnl_queue_net *q = nfnl_queue_pernet(net); | |
039b40ee | 947 | unsigned int instances = 0; |
8405a8ff EB |
948 | int i; |
949 | ||
8405a8ff EB |
950 | for (i = 0; i < INSTANCE_BUCKETS; i++) { |
951 | struct nfqnl_instance *inst; | |
952 | struct hlist_head *head = &q->instance_table[i]; | |
953 | ||
039b40ee FW |
954 | hlist_for_each_entry_rcu(inst, head, hlist) { |
955 | nfqnl_flush(inst, NULL, 0); | |
956 | instances++; | |
957 | } | |
8405a8ff | 958 | } |
039b40ee FW |
959 | |
960 | return instances; | |
8405a8ff EB |
961 | } |
962 | ||
7af4cc3f HW |
963 | static int |
964 | nfqnl_rcv_nl_event(struct notifier_block *this, | |
965 | unsigned long event, void *ptr) | |
966 | { | |
967 | struct netlink_notify *n = ptr; | |
e8179610 | 968 | struct nfnl_queue_net *q = nfnl_queue_pernet(n->net); |
7af4cc3f | 969 | |
dee5817e | 970 | if (event == NETLINK_URELEASE && n->protocol == NETLINK_NETFILTER) { |
7af4cc3f HW |
971 | int i; |
972 | ||
15e47304 | 973 | /* destroy all instances for this portid */ |
e8179610 | 974 | spin_lock(&q->instances_lock); |
9872bec7 | 975 | for (i = 0; i < INSTANCE_BUCKETS; i++) { |
b67bfe0d | 976 | struct hlist_node *t2; |
7af4cc3f | 977 | struct nfqnl_instance *inst; |
e8179610 | 978 | struct hlist_head *head = &q->instance_table[i]; |
7af4cc3f | 979 | |
b67bfe0d | 980 | hlist_for_each_entry_safe(inst, t2, head, hlist) { |
e8179610 | 981 | if (n->portid == inst->peer_portid) |
7af4cc3f HW |
982 | __instance_destroy(inst); |
983 | } | |
984 | } | |
e8179610 | 985 | spin_unlock(&q->instances_lock); |
7af4cc3f HW |
986 | } |
987 | return NOTIFY_DONE; | |
988 | } | |
989 | ||
990 | static struct notifier_block nfqnl_rtnl_notifier = { | |
991 | .notifier_call = nfqnl_rcv_nl_event, | |
992 | }; | |
993 | ||
8d45ff22 SB |
994 | static const struct nla_policy nfqa_vlan_policy[NFQA_VLAN_MAX + 1] = { |
995 | [NFQA_VLAN_TCI] = { .type = NLA_U16}, | |
996 | [NFQA_VLAN_PROTO] = { .type = NLA_U16}, | |
997 | }; | |
998 | ||
5bf75853 PM |
999 | static const struct nla_policy nfqa_verdict_policy[NFQA_MAX+1] = { |
1000 | [NFQA_VERDICT_HDR] = { .len = sizeof(struct nfqnl_msg_verdict_hdr) }, | |
1001 | [NFQA_MARK] = { .type = NLA_U32 }, | |
1002 | [NFQA_PAYLOAD] = { .type = NLA_UNSPEC }, | |
9cb01766 | 1003 | [NFQA_CT] = { .type = NLA_UNSPEC }, |
bd077937 | 1004 | [NFQA_EXP] = { .type = NLA_UNSPEC }, |
8d45ff22 | 1005 | [NFQA_VLAN] = { .type = NLA_NESTED }, |
838ab636 HW |
1006 | }; |
1007 | ||
97d32cf9 FW |
1008 | static const struct nla_policy nfqa_verdict_batch_policy[NFQA_MAX+1] = { |
1009 | [NFQA_VERDICT_HDR] = { .len = sizeof(struct nfqnl_msg_verdict_hdr) }, | |
1010 | [NFQA_MARK] = { .type = NLA_U32 }, | |
1011 | }; | |
1012 | ||
e8179610 | 1013 | static struct nfqnl_instance * |
cc6bc448 | 1014 | verdict_instance_lookup(struct nfnl_queue_net *q, u16 queue_num, u32 nlportid) |
97d32cf9 FW |
1015 | { |
1016 | struct nfqnl_instance *queue; | |
1017 | ||
e8179610 | 1018 | queue = instance_lookup(q, queue_num); |
97d32cf9 FW |
1019 | if (!queue) |
1020 | return ERR_PTR(-ENODEV); | |
1021 | ||
15e47304 | 1022 | if (queue->peer_portid != nlportid) |
97d32cf9 FW |
1023 | return ERR_PTR(-EPERM); |
1024 | ||
1025 | return queue; | |
1026 | } | |
1027 | ||
1028 | static struct nfqnl_msg_verdict_hdr* | |
1029 | verdicthdr_get(const struct nlattr * const nfqa[]) | |
1030 | { | |
1031 | struct nfqnl_msg_verdict_hdr *vhdr; | |
1032 | unsigned int verdict; | |
1033 | ||
1034 | if (!nfqa[NFQA_VERDICT_HDR]) | |
1035 | return NULL; | |
1036 | ||
1037 | vhdr = nla_data(nfqa[NFQA_VERDICT_HDR]); | |
c6675233 FW |
1038 | verdict = ntohl(vhdr->verdict) & NF_VERDICT_MASK; |
1039 | if (verdict > NF_MAX_VERDICT || verdict == NF_STOLEN) | |
97d32cf9 FW |
1040 | return NULL; |
1041 | return vhdr; | |
1042 | } | |
1043 | ||
1044 | static int nfq_id_after(unsigned int id, unsigned int max) | |
1045 | { | |
1046 | return (int)(id - max) > 0; | |
1047 | } | |
1048 | ||
7b8002a1 PNA |
1049 | static int nfqnl_recv_verdict_batch(struct net *net, struct sock *ctnl, |
1050 | struct sk_buff *skb, | |
1051 | const struct nlmsghdr *nlh, | |
04ba724b PNA |
1052 | const struct nlattr * const nfqa[], |
1053 | struct netlink_ext_ack *extack) | |
97d32cf9 | 1054 | { |
3da07c0c | 1055 | struct nfgenmsg *nfmsg = nlmsg_data(nlh); |
97d32cf9 FW |
1056 | struct nf_queue_entry *entry, *tmp; |
1057 | unsigned int verdict, maxid; | |
1058 | struct nfqnl_msg_verdict_hdr *vhdr; | |
1059 | struct nfqnl_instance *queue; | |
1060 | LIST_HEAD(batch_list); | |
1061 | u16 queue_num = ntohs(nfmsg->res_id); | |
e8179610 G |
1062 | struct nfnl_queue_net *q = nfnl_queue_pernet(net); |
1063 | ||
1064 | queue = verdict_instance_lookup(q, queue_num, | |
1065 | NETLINK_CB(skb).portid); | |
97d32cf9 FW |
1066 | if (IS_ERR(queue)) |
1067 | return PTR_ERR(queue); | |
1068 | ||
1069 | vhdr = verdicthdr_get(nfqa); | |
1070 | if (!vhdr) | |
1071 | return -EINVAL; | |
1072 | ||
1073 | verdict = ntohl(vhdr->verdict); | |
1074 | maxid = ntohl(vhdr->id); | |
1075 | ||
1076 | spin_lock_bh(&queue->lock); | |
1077 | ||
1078 | list_for_each_entry_safe(entry, tmp, &queue->queue_list, list) { | |
1079 | if (nfq_id_after(entry->id, maxid)) | |
1080 | break; | |
1081 | __dequeue_entry(queue, entry); | |
1082 | list_add_tail(&entry->list, &batch_list); | |
1083 | } | |
1084 | ||
1085 | spin_unlock_bh(&queue->lock); | |
1086 | ||
1087 | if (list_empty(&batch_list)) | |
1088 | return -ENOENT; | |
1089 | ||
1090 | list_for_each_entry_safe(entry, tmp, &batch_list, list) { | |
1091 | if (nfqa[NFQA_MARK]) | |
1092 | entry->skb->mark = ntohl(nla_get_be32(nfqa[NFQA_MARK])); | |
1093 | nf_reinject(entry, verdict); | |
1094 | } | |
1095 | return 0; | |
1096 | } | |
1097 | ||
a4b4766c | 1098 | static struct nf_conn *nfqnl_ct_parse(struct nfnl_ct_hook *nfnl_ct, |
b7bd1809 PNA |
1099 | const struct nlmsghdr *nlh, |
1100 | const struct nlattr * const nfqa[], | |
1101 | struct nf_queue_entry *entry, | |
1102 | enum ip_conntrack_info *ctinfo) | |
1103 | { | |
1104 | struct nf_conn *ct; | |
1105 | ||
a4b4766c | 1106 | ct = nfnl_ct->get_ct(entry->skb, ctinfo); |
b7bd1809 PNA |
1107 | if (ct == NULL) |
1108 | return NULL; | |
1109 | ||
a4b4766c | 1110 | if (nfnl_ct->parse(nfqa[NFQA_CT], ct) < 0) |
b7bd1809 PNA |
1111 | return NULL; |
1112 | ||
1113 | if (nfqa[NFQA_EXP]) | |
a4b4766c | 1114 | nfnl_ct->attach_expect(nfqa[NFQA_EXP], ct, |
b7bd1809 PNA |
1115 | NETLINK_CB(entry->skb).portid, |
1116 | nlmsg_report(nlh)); | |
1117 | return ct; | |
1118 | } | |
1119 | ||
8d45ff22 SB |
1120 | static int nfqa_parse_bridge(struct nf_queue_entry *entry, |
1121 | const struct nlattr * const nfqa[]) | |
1122 | { | |
1123 | if (nfqa[NFQA_VLAN]) { | |
1124 | struct nlattr *tb[NFQA_VLAN_MAX + 1]; | |
1125 | int err; | |
1126 | ||
1127 | err = nla_parse_nested(tb, NFQA_VLAN_MAX, nfqa[NFQA_VLAN], | |
fceb6435 | 1128 | nfqa_vlan_policy, NULL); |
8d45ff22 SB |
1129 | if (err < 0) |
1130 | return err; | |
1131 | ||
1132 | if (!tb[NFQA_VLAN_TCI] || !tb[NFQA_VLAN_PROTO]) | |
1133 | return -EINVAL; | |
1134 | ||
1135 | entry->skb->vlan_tci = ntohs(nla_get_be16(tb[NFQA_VLAN_TCI])); | |
1136 | entry->skb->vlan_proto = nla_get_be16(tb[NFQA_VLAN_PROTO]); | |
1137 | } | |
1138 | ||
1139 | if (nfqa[NFQA_L2HDR]) { | |
1140 | int mac_header_len = entry->skb->network_header - | |
1141 | entry->skb->mac_header; | |
1142 | ||
1143 | if (mac_header_len != nla_len(nfqa[NFQA_L2HDR])) | |
1144 | return -EINVAL; | |
1145 | else if (mac_header_len > 0) | |
1146 | memcpy(skb_mac_header(entry->skb), | |
1147 | nla_data(nfqa[NFQA_L2HDR]), | |
1148 | mac_header_len); | |
1149 | } | |
1150 | ||
1151 | return 0; | |
1152 | } | |
1153 | ||
7b8002a1 PNA |
1154 | static int nfqnl_recv_verdict(struct net *net, struct sock *ctnl, |
1155 | struct sk_buff *skb, | |
1156 | const struct nlmsghdr *nlh, | |
04ba724b PNA |
1157 | const struct nlattr * const nfqa[], |
1158 | struct netlink_ext_ack *extack) | |
7af4cc3f | 1159 | { |
3da07c0c | 1160 | struct nfgenmsg *nfmsg = nlmsg_data(nlh); |
7af4cc3f | 1161 | u_int16_t queue_num = ntohs(nfmsg->res_id); |
7af4cc3f HW |
1162 | struct nfqnl_msg_verdict_hdr *vhdr; |
1163 | struct nfqnl_instance *queue; | |
1164 | unsigned int verdict; | |
02f014d8 | 1165 | struct nf_queue_entry *entry; |
8c88f87c | 1166 | enum ip_conntrack_info uninitialized_var(ctinfo); |
a4b4766c | 1167 | struct nfnl_ct_hook *nfnl_ct; |
8c88f87c | 1168 | struct nf_conn *ct = NULL; |
e8179610 | 1169 | struct nfnl_queue_net *q = nfnl_queue_pernet(net); |
8d45ff22 | 1170 | int err; |
7af4cc3f | 1171 | |
00a3101f LZ |
1172 | queue = verdict_instance_lookup(q, queue_num, |
1173 | NETLINK_CB(skb).portid); | |
97d32cf9 FW |
1174 | if (IS_ERR(queue)) |
1175 | return PTR_ERR(queue); | |
7af4cc3f | 1176 | |
97d32cf9 FW |
1177 | vhdr = verdicthdr_get(nfqa); |
1178 | if (!vhdr) | |
84a797dd | 1179 | return -EINVAL; |
7af4cc3f | 1180 | |
7af4cc3f HW |
1181 | verdict = ntohl(vhdr->verdict); |
1182 | ||
b43d8d85 | 1183 | entry = find_dequeue_entry(queue, ntohl(vhdr->id)); |
84a797dd ED |
1184 | if (entry == NULL) |
1185 | return -ENOENT; | |
7af4cc3f | 1186 | |
8e662164 AB |
1187 | /* rcu lock already held from nfnl->call_rcu. */ |
1188 | nfnl_ct = rcu_dereference(nfnl_ct_hook); | |
1189 | ||
bd077937 | 1190 | if (nfqa[NFQA_CT]) { |
a4b4766c KM |
1191 | if (nfnl_ct != NULL) |
1192 | ct = nfqnl_ct_parse(nfnl_ct, nlh, nfqa, entry, &ctinfo); | |
bd077937 | 1193 | } |
9cb01766 | 1194 | |
8d45ff22 SB |
1195 | if (entry->state.pf == PF_BRIDGE) { |
1196 | err = nfqa_parse_bridge(entry, nfqa); | |
1197 | if (err < 0) | |
1198 | return err; | |
1199 | } | |
1200 | ||
df6fb868 | 1201 | if (nfqa[NFQA_PAYLOAD]) { |
8c88f87c PNA |
1202 | u16 payload_len = nla_len(nfqa[NFQA_PAYLOAD]); |
1203 | int diff = payload_len - entry->skb->len; | |
1204 | ||
df6fb868 | 1205 | if (nfqnl_mangle(nla_data(nfqa[NFQA_PAYLOAD]), |
8c88f87c | 1206 | payload_len, entry, diff) < 0) |
7af4cc3f | 1207 | verdict = NF_DROP; |
8c88f87c | 1208 | |
b7bd1809 | 1209 | if (ct && diff) |
a4b4766c | 1210 | nfnl_ct->seq_adjust(entry->skb, ct, ctinfo, diff); |
7af4cc3f HW |
1211 | } |
1212 | ||
df6fb868 | 1213 | if (nfqa[NFQA_MARK]) |
ea3a66ff | 1214 | entry->skb->mark = ntohl(nla_get_be32(nfqa[NFQA_MARK])); |
601e68e1 | 1215 | |
4b3d15ef | 1216 | nf_reinject(entry, verdict); |
7af4cc3f HW |
1217 | return 0; |
1218 | } | |
1219 | ||
7b8002a1 PNA |
1220 | static int nfqnl_recv_unsupp(struct net *net, struct sock *ctnl, |
1221 | struct sk_buff *skb, const struct nlmsghdr *nlh, | |
04ba724b PNA |
1222 | const struct nlattr * const nfqa[], |
1223 | struct netlink_ext_ack *extack) | |
7af4cc3f HW |
1224 | { |
1225 | return -ENOTSUPP; | |
1226 | } | |
1227 | ||
5bf75853 PM |
1228 | static const struct nla_policy nfqa_cfg_policy[NFQA_CFG_MAX+1] = { |
1229 | [NFQA_CFG_CMD] = { .len = sizeof(struct nfqnl_msg_config_cmd) }, | |
1230 | [NFQA_CFG_PARAMS] = { .len = sizeof(struct nfqnl_msg_config_params) }, | |
838ab636 HW |
1231 | }; |
1232 | ||
e3ac5298 | 1233 | static const struct nf_queue_handler nfqh = { |
d4ef3835 AS |
1234 | .outfn = nfqnl_enqueue_packet, |
1235 | .nf_hook_drop = nfqnl_nf_hook_drop, | |
bbd86b9f HW |
1236 | }; |
1237 | ||
7b8002a1 PNA |
1238 | static int nfqnl_recv_config(struct net *net, struct sock *ctnl, |
1239 | struct sk_buff *skb, const struct nlmsghdr *nlh, | |
04ba724b PNA |
1240 | const struct nlattr * const nfqa[], |
1241 | struct netlink_ext_ack *extack) | |
7af4cc3f | 1242 | { |
3da07c0c | 1243 | struct nfgenmsg *nfmsg = nlmsg_data(nlh); |
7af4cc3f HW |
1244 | u_int16_t queue_num = ntohs(nfmsg->res_id); |
1245 | struct nfqnl_instance *queue; | |
9872bec7 | 1246 | struct nfqnl_msg_config_cmd *cmd = NULL; |
e8179610 | 1247 | struct nfnl_queue_net *q = nfnl_queue_pernet(net); |
60d2c7f9 | 1248 | __u32 flags = 0, mask = 0; |
838ab636 | 1249 | int ret = 0; |
7af4cc3f | 1250 | |
9872bec7 PM |
1251 | if (nfqa[NFQA_CFG_CMD]) { |
1252 | cmd = nla_data(nfqa[NFQA_CFG_CMD]); | |
1253 | ||
0360ae41 | 1254 | /* Obsolete commands without queue context */ |
9872bec7 | 1255 | switch (cmd->command) { |
0360ae41 FW |
1256 | case NFQNL_CFG_CMD_PF_BIND: return 0; |
1257 | case NFQNL_CFG_CMD_PF_UNBIND: return 0; | |
9872bec7 | 1258 | } |
9872bec7 PM |
1259 | } |
1260 | ||
60d2c7f9 KM |
1261 | /* Check if we support these flags in first place, dependencies should |
1262 | * be there too not to break atomicity. | |
1263 | */ | |
1264 | if (nfqa[NFQA_CFG_FLAGS]) { | |
1265 | if (!nfqa[NFQA_CFG_MASK]) { | |
1266 | /* A mask is needed to specify which flags are being | |
1267 | * changed. | |
1268 | */ | |
1269 | return -EINVAL; | |
1270 | } | |
1271 | ||
1272 | flags = ntohl(nla_get_be32(nfqa[NFQA_CFG_FLAGS])); | |
1273 | mask = ntohl(nla_get_be32(nfqa[NFQA_CFG_MASK])); | |
1274 | ||
1275 | if (flags >= NFQA_CFG_F_MAX) | |
1276 | return -EOPNOTSUPP; | |
1277 | ||
1278 | #if !IS_ENABLED(CONFIG_NETWORK_SECMARK) | |
1279 | if (flags & mask & NFQA_CFG_F_SECCTX) | |
1280 | return -EOPNOTSUPP; | |
1281 | #endif | |
71b2e5f5 KM |
1282 | if ((flags & mask & NFQA_CFG_F_CONNTRACK) && |
1283 | !rcu_access_pointer(nfnl_ct_hook)) { | |
1284 | #ifdef CONFIG_MODULES | |
1285 | nfnl_unlock(NFNL_SUBSYS_QUEUE); | |
1286 | request_module("ip_conntrack_netlink"); | |
1287 | nfnl_lock(NFNL_SUBSYS_QUEUE); | |
1288 | if (rcu_access_pointer(nfnl_ct_hook)) | |
1289 | return -EAGAIN; | |
1290 | #endif | |
1291 | return -EOPNOTSUPP; | |
1292 | } | |
60d2c7f9 KM |
1293 | } |
1294 | ||
9872bec7 | 1295 | rcu_read_lock(); |
e8179610 | 1296 | queue = instance_lookup(q, queue_num); |
15e47304 | 1297 | if (queue && queue->peer_portid != NETLINK_CB(skb).portid) { |
a3c8e7fd | 1298 | ret = -EPERM; |
9872bec7 | 1299 | goto err_out_unlock; |
a3c8e7fd PM |
1300 | } |
1301 | ||
9872bec7 | 1302 | if (cmd != NULL) { |
7af4cc3f HW |
1303 | switch (cmd->command) { |
1304 | case NFQNL_CFG_CMD_BIND: | |
9872bec7 PM |
1305 | if (queue) { |
1306 | ret = -EBUSY; | |
1307 | goto err_out_unlock; | |
1308 | } | |
e8179610 G |
1309 | queue = instance_create(q, queue_num, |
1310 | NETLINK_CB(skb).portid); | |
baab2ce7 PM |
1311 | if (IS_ERR(queue)) { |
1312 | ret = PTR_ERR(queue); | |
9872bec7 PM |
1313 | goto err_out_unlock; |
1314 | } | |
7af4cc3f HW |
1315 | break; |
1316 | case NFQNL_CFG_CMD_UNBIND: | |
9872bec7 PM |
1317 | if (!queue) { |
1318 | ret = -ENODEV; | |
1319 | goto err_out_unlock; | |
1320 | } | |
e8179610 | 1321 | instance_destroy(q, queue); |
17bc6b48 | 1322 | goto err_out_unlock; |
7af4cc3f | 1323 | case NFQNL_CFG_CMD_PF_BIND: |
7af4cc3f | 1324 | case NFQNL_CFG_CMD_PF_UNBIND: |
7af4cc3f HW |
1325 | break; |
1326 | default: | |
cd21f0ac | 1327 | ret = -ENOTSUPP; |
21c3c971 | 1328 | goto err_out_unlock; |
7af4cc3f | 1329 | } |
7af4cc3f HW |
1330 | } |
1331 | ||
60d2c7f9 KM |
1332 | if (!queue) { |
1333 | ret = -ENODEV; | |
1334 | goto err_out_unlock; | |
1335 | } | |
1336 | ||
df6fb868 | 1337 | if (nfqa[NFQA_CFG_PARAMS]) { |
60d2c7f9 KM |
1338 | struct nfqnl_msg_config_params *params = |
1339 | nla_data(nfqa[NFQA_CFG_PARAMS]); | |
7af4cc3f HW |
1340 | |
1341 | nfqnl_set_mode(queue, params->copy_mode, | |
1342 | ntohl(params->copy_range)); | |
1343 | } | |
1344 | ||
df6fb868 | 1345 | if (nfqa[NFQA_CFG_QUEUE_MAXLEN]) { |
60d2c7f9 | 1346 | __be32 *queue_maxlen = nla_data(nfqa[NFQA_CFG_QUEUE_MAXLEN]); |
a3c8e7fd | 1347 | |
829e17a1 EL |
1348 | spin_lock_bh(&queue->lock); |
1349 | queue->queue_maxlen = ntohl(*queue_maxlen); | |
1350 | spin_unlock_bh(&queue->lock); | |
1351 | } | |
1352 | ||
fdb694a0 | 1353 | if (nfqa[NFQA_CFG_FLAGS]) { |
fdb694a0 KK |
1354 | spin_lock_bh(&queue->lock); |
1355 | queue->flags &= ~mask; | |
1356 | queue->flags |= flags & mask; | |
1357 | spin_unlock_bh(&queue->lock); | |
1358 | } | |
1359 | ||
9872bec7 PM |
1360 | err_out_unlock: |
1361 | rcu_read_unlock(); | |
838ab636 | 1362 | return ret; |
7af4cc3f HW |
1363 | } |
1364 | ||
7c8d4cb4 | 1365 | static const struct nfnl_callback nfqnl_cb[NFQNL_MSG_MAX] = { |
84a797dd | 1366 | [NFQNL_MSG_PACKET] = { .call_rcu = nfqnl_recv_unsupp, |
37d2e7a2 | 1367 | .attr_count = NFQA_MAX, }, |
84a797dd | 1368 | [NFQNL_MSG_VERDICT] = { .call_rcu = nfqnl_recv_verdict, |
5bf75853 PM |
1369 | .attr_count = NFQA_MAX, |
1370 | .policy = nfqa_verdict_policy }, | |
7af4cc3f | 1371 | [NFQNL_MSG_CONFIG] = { .call = nfqnl_recv_config, |
5bf75853 PM |
1372 | .attr_count = NFQA_CFG_MAX, |
1373 | .policy = nfqa_cfg_policy }, | |
97d32cf9 FW |
1374 | [NFQNL_MSG_VERDICT_BATCH]={ .call_rcu = nfqnl_recv_verdict_batch, |
1375 | .attr_count = NFQA_MAX, | |
1376 | .policy = nfqa_verdict_batch_policy }, | |
7af4cc3f HW |
1377 | }; |
1378 | ||
7c8d4cb4 | 1379 | static const struct nfnetlink_subsystem nfqnl_subsys = { |
7af4cc3f HW |
1380 | .name = "nf_queue", |
1381 | .subsys_id = NFNL_SUBSYS_QUEUE, | |
1382 | .cb_count = NFQNL_MSG_MAX, | |
7af4cc3f HW |
1383 | .cb = nfqnl_cb, |
1384 | }; | |
1385 | ||
838ab636 HW |
1386 | #ifdef CONFIG_PROC_FS |
1387 | struct iter_state { | |
e8179610 | 1388 | struct seq_net_private p; |
838ab636 HW |
1389 | unsigned int bucket; |
1390 | }; | |
1391 | ||
1392 | static struct hlist_node *get_first(struct seq_file *seq) | |
1393 | { | |
1394 | struct iter_state *st = seq->private; | |
e8179610 G |
1395 | struct net *net; |
1396 | struct nfnl_queue_net *q; | |
838ab636 HW |
1397 | |
1398 | if (!st) | |
1399 | return NULL; | |
1400 | ||
e8179610 G |
1401 | net = seq_file_net(seq); |
1402 | q = nfnl_queue_pernet(net); | |
838ab636 | 1403 | for (st->bucket = 0; st->bucket < INSTANCE_BUCKETS; st->bucket++) { |
e8179610 G |
1404 | if (!hlist_empty(&q->instance_table[st->bucket])) |
1405 | return q->instance_table[st->bucket].first; | |
838ab636 HW |
1406 | } |
1407 | return NULL; | |
1408 | } | |
1409 | ||
1410 | static struct hlist_node *get_next(struct seq_file *seq, struct hlist_node *h) | |
1411 | { | |
1412 | struct iter_state *st = seq->private; | |
e8179610 | 1413 | struct net *net = seq_file_net(seq); |
838ab636 HW |
1414 | |
1415 | h = h->next; | |
1416 | while (!h) { | |
e8179610 G |
1417 | struct nfnl_queue_net *q; |
1418 | ||
838ab636 HW |
1419 | if (++st->bucket >= INSTANCE_BUCKETS) |
1420 | return NULL; | |
1421 | ||
e8179610 G |
1422 | q = nfnl_queue_pernet(net); |
1423 | h = q->instance_table[st->bucket].first; | |
838ab636 HW |
1424 | } |
1425 | return h; | |
1426 | } | |
1427 | ||
1428 | static struct hlist_node *get_idx(struct seq_file *seq, loff_t pos) | |
1429 | { | |
1430 | struct hlist_node *head; | |
1431 | head = get_first(seq); | |
1432 | ||
1433 | if (head) | |
1434 | while (pos && (head = get_next(seq, head))) | |
1435 | pos--; | |
1436 | return pos ? NULL : head; | |
1437 | } | |
1438 | ||
e8179610 G |
1439 | static void *seq_start(struct seq_file *s, loff_t *pos) |
1440 | __acquires(nfnl_queue_pernet(seq_file_net(s))->instances_lock) | |
838ab636 | 1441 | { |
e8179610 G |
1442 | spin_lock(&nfnl_queue_pernet(seq_file_net(s))->instances_lock); |
1443 | return get_idx(s, *pos); | |
838ab636 HW |
1444 | } |
1445 | ||
1446 | static void *seq_next(struct seq_file *s, void *v, loff_t *pos) | |
1447 | { | |
1448 | (*pos)++; | |
1449 | return get_next(s, v); | |
1450 | } | |
1451 | ||
1452 | static void seq_stop(struct seq_file *s, void *v) | |
e8179610 | 1453 | __releases(nfnl_queue_pernet(seq_file_net(s))->instances_lock) |
838ab636 | 1454 | { |
e8179610 | 1455 | spin_unlock(&nfnl_queue_pernet(seq_file_net(s))->instances_lock); |
838ab636 HW |
1456 | } |
1457 | ||
1458 | static int seq_show(struct seq_file *s, void *v) | |
1459 | { | |
1460 | const struct nfqnl_instance *inst = v; | |
1461 | ||
6b46f7b7 | 1462 | seq_printf(s, "%5u %6u %5u %1u %5u %5u %5u %8u %2d\n", |
e71456ae SRRH |
1463 | inst->queue_num, |
1464 | inst->peer_portid, inst->queue_total, | |
1465 | inst->copy_mode, inst->copy_range, | |
1466 | inst->queue_dropped, inst->queue_user_dropped, | |
1467 | inst->id_sequence, 1); | |
861fb107 | 1468 | return 0; |
838ab636 HW |
1469 | } |
1470 | ||
56b3d975 | 1471 | static const struct seq_operations nfqnl_seq_ops = { |
838ab636 HW |
1472 | .start = seq_start, |
1473 | .next = seq_next, | |
1474 | .stop = seq_stop, | |
1475 | .show = seq_show, | |
1476 | }; | |
1477 | ||
1478 | static int nfqnl_open(struct inode *inode, struct file *file) | |
1479 | { | |
e8179610 | 1480 | return seq_open_net(inode, file, &nfqnl_seq_ops, |
e2da5913 | 1481 | sizeof(struct iter_state)); |
838ab636 HW |
1482 | } |
1483 | ||
da7071d7 | 1484 | static const struct file_operations nfqnl_file_ops = { |
838ab636 HW |
1485 | .owner = THIS_MODULE, |
1486 | .open = nfqnl_open, | |
1487 | .read = seq_read, | |
1488 | .llseek = seq_lseek, | |
e8179610 | 1489 | .release = seq_release_net, |
838ab636 HW |
1490 | }; |
1491 | ||
1492 | #endif /* PROC_FS */ | |
1493 | ||
e8179610 | 1494 | static int __net_init nfnl_queue_net_init(struct net *net) |
7af4cc3f | 1495 | { |
e8179610 G |
1496 | unsigned int i; |
1497 | struct nfnl_queue_net *q = nfnl_queue_pernet(net); | |
601e68e1 | 1498 | |
838ab636 | 1499 | for (i = 0; i < INSTANCE_BUCKETS; i++) |
e8179610 G |
1500 | INIT_HLIST_HEAD(&q->instance_table[i]); |
1501 | ||
1502 | spin_lock_init(&q->instances_lock); | |
1503 | ||
1504 | #ifdef CONFIG_PROC_FS | |
1505 | if (!proc_create("nfnetlink_queue", 0440, | |
1506 | net->nf.proc_netfilter, &nfqnl_file_ops)) | |
1507 | return -ENOMEM; | |
1508 | #endif | |
dc3ee32e | 1509 | nf_register_queue_handler(net, &nfqh); |
e8179610 G |
1510 | return 0; |
1511 | } | |
1512 | ||
1513 | static void __net_exit nfnl_queue_net_exit(struct net *net) | |
1514 | { | |
613d0776 VA |
1515 | struct nfnl_queue_net *q = nfnl_queue_pernet(net); |
1516 | unsigned int i; | |
1517 | ||
dc3ee32e | 1518 | nf_unregister_queue_handler(net); |
e778f56e | 1519 | #ifdef CONFIG_PROC_FS |
e8179610 | 1520 | remove_proc_entry("nfnetlink_queue", net->nf.proc_netfilter); |
e778f56e | 1521 | #endif |
613d0776 VA |
1522 | for (i = 0; i < INSTANCE_BUCKETS; i++) |
1523 | WARN_ON_ONCE(!hlist_empty(&q->instance_table[i])); | |
e8179610 G |
1524 | } |
1525 | ||
dc3ee32e EB |
1526 | static void nfnl_queue_net_exit_batch(struct list_head *net_exit_list) |
1527 | { | |
1528 | synchronize_rcu(); | |
1529 | } | |
1530 | ||
e8179610 | 1531 | static struct pernet_operations nfnl_queue_net_ops = { |
dc3ee32e EB |
1532 | .init = nfnl_queue_net_init, |
1533 | .exit = nfnl_queue_net_exit, | |
1534 | .exit_batch = nfnl_queue_net_exit_batch, | |
1535 | .id = &nfnl_queue_net_id, | |
1536 | .size = sizeof(struct nfnl_queue_net), | |
e8179610 G |
1537 | }; |
1538 | ||
1539 | static int __init nfnetlink_queue_init(void) | |
1540 | { | |
3bfe0498 FR |
1541 | int status; |
1542 | ||
1543 | status = register_pernet_subsys(&nfnl_queue_net_ops); | |
1544 | if (status < 0) { | |
1545 | pr_err("nf_queue: failed to register pernet ops\n"); | |
1546 | goto out; | |
1547 | } | |
838ab636 | 1548 | |
7af4cc3f HW |
1549 | netlink_register_notifier(&nfqnl_rtnl_notifier); |
1550 | status = nfnetlink_subsys_register(&nfqnl_subsys); | |
1551 | if (status < 0) { | |
e8179610 | 1552 | pr_err("nf_queue: failed to create netlink socket\n"); |
7af4cc3f HW |
1553 | goto cleanup_netlink_notifier; |
1554 | } | |
1555 | ||
4e6577de GF |
1556 | status = register_netdevice_notifier(&nfqnl_dev_notifier); |
1557 | if (status < 0) { | |
1558 | pr_err("nf_queue: failed to register netdevice notifier\n"); | |
1559 | goto cleanup_netlink_subsys; | |
1560 | } | |
1561 | ||
7af4cc3f HW |
1562 | return status; |
1563 | ||
4e6577de GF |
1564 | cleanup_netlink_subsys: |
1565 | nfnetlink_subsys_unregister(&nfqnl_subsys); | |
7af4cc3f HW |
1566 | cleanup_netlink_notifier: |
1567 | netlink_unregister_notifier(&nfqnl_rtnl_notifier); | |
639e077b | 1568 | unregister_pernet_subsys(&nfnl_queue_net_ops); |
3bfe0498 | 1569 | out: |
7af4cc3f HW |
1570 | return status; |
1571 | } | |
1572 | ||
65b4b4e8 | 1573 | static void __exit nfnetlink_queue_fini(void) |
7af4cc3f | 1574 | { |
32292a7f | 1575 | unregister_netdevice_notifier(&nfqnl_dev_notifier); |
32292a7f PM |
1576 | nfnetlink_subsys_unregister(&nfqnl_subsys); |
1577 | netlink_unregister_notifier(&nfqnl_rtnl_notifier); | |
3bfe0498 | 1578 | unregister_pernet_subsys(&nfnl_queue_net_ops); |
67137f3c JDB |
1579 | |
1580 | rcu_barrier(); /* Wait for completion of call_rcu()'s */ | |
7af4cc3f HW |
1581 | } |
1582 | ||
1583 | MODULE_DESCRIPTION("netfilter packet queue handler"); | |
1584 | MODULE_AUTHOR("Harald Welte <laforge@netfilter.org>"); | |
1585 | MODULE_LICENSE("GPL"); | |
1586 | MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_QUEUE); | |
1587 | ||
65b4b4e8 AM |
1588 | module_init(nfnetlink_queue_init); |
1589 | module_exit(nfnetlink_queue_fini); |