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Commit | Line | Data |
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d2912cb1 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
7af4cc3f HW |
2 | /* |
3 | * This is a module which is used for queueing packets and communicating with | |
67137f3c | 4 | * userspace via nfnetlink. |
7af4cc3f HW |
5 | * |
6 | * (C) 2005 by Harald Welte <laforge@netfilter.org> | |
4ad9d4fa | 7 | * (C) 2007 by Patrick McHardy <kaber@trash.net> |
7af4cc3f HW |
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> | |
7af4cc3f | 12 | */ |
5191d70f AS |
13 | |
14 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt | |
15 | ||
7af4cc3f HW |
16 | #include <linux/module.h> |
17 | #include <linux/skbuff.h> | |
18 | #include <linux/init.h> | |
19 | #include <linux/spinlock.h> | |
5a0e3ad6 | 20 | #include <linux/slab.h> |
7af4cc3f HW |
21 | #include <linux/notifier.h> |
22 | #include <linux/netdevice.h> | |
23 | #include <linux/netfilter.h> | |
838ab636 | 24 | #include <linux/proc_fs.h> |
7af4cc3f HW |
25 | #include <linux/netfilter_ipv4.h> |
26 | #include <linux/netfilter_ipv6.h> | |
c737b7c4 | 27 | #include <linux/netfilter_bridge.h> |
7af4cc3f HW |
28 | #include <linux/netfilter/nfnetlink.h> |
29 | #include <linux/netfilter/nfnetlink_queue.h> | |
b7bd1809 | 30 | #include <linux/netfilter/nf_conntrack_common.h> |
7af4cc3f HW |
31 | #include <linux/list.h> |
32 | #include <net/sock.h> | |
83111e7f | 33 | #include <net/tcp_states.h> |
c01cd429 | 34 | #include <net/netfilter/nf_queue.h> |
e8179610 | 35 | #include <net/netns/generic.h> |
7af4cc3f | 36 | |
60063497 | 37 | #include <linux/atomic.h> |
7af4cc3f | 38 | |
1109a90c | 39 | #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER) |
fbcd923c HW |
40 | #include "../bridge/br_private.h" |
41 | #endif | |
42 | ||
5da773a3 FW |
43 | #if IS_ENABLED(CONFIG_NF_CONNTRACK) |
44 | #include <net/netfilter/nf_conntrack.h> | |
45 | #endif | |
46 | ||
7af4cc3f HW |
47 | #define NFQNL_QMAX_DEFAULT 1024 |
48 | ||
9cefbbc9 FW |
49 | /* We're using struct nlattr which has 16bit nla_len. Note that nla_len |
50 | * includes the header length. Thus, the maximum packet length that we | |
51 | * support is 65531 bytes. We send truncated packets if the specified length | |
52 | * is larger than that. Userspace can check for presence of NFQA_CAP_LEN | |
53 | * attribute to detect truncation. | |
54 | */ | |
55 | #define NFQNL_MAX_COPY_RANGE (0xffff - NLA_HDRLEN) | |
56 | ||
7af4cc3f HW |
57 | struct nfqnl_instance { |
58 | struct hlist_node hlist; /* global list of queues */ | |
9872bec7 | 59 | struct rcu_head rcu; |
7af4cc3f | 60 | |
cc6bc448 | 61 | u32 peer_portid; |
7af4cc3f HW |
62 | unsigned int queue_maxlen; |
63 | unsigned int copy_range; | |
7af4cc3f HW |
64 | unsigned int queue_dropped; |
65 | unsigned int queue_user_dropped; | |
66 | ||
7af4cc3f HW |
67 | |
68 | u_int16_t queue_num; /* number of this queue */ | |
69 | u_int8_t copy_mode; | |
fdb694a0 | 70 | u_int32_t flags; /* Set using NFQA_CFG_FLAGS */ |
c463ac97 ED |
71 | /* |
72 | * Following fields are dirtied for each queued packet, | |
73 | * keep them in same cache line if possible. | |
74 | */ | |
886bc503 | 75 | spinlock_t lock ____cacheline_aligned_in_smp; |
c463ac97 | 76 | unsigned int queue_total; |
5863702a | 77 | unsigned int id_sequence; /* 'sequence' of pkt ids */ |
7af4cc3f HW |
78 | struct list_head queue_list; /* packets in queue */ |
79 | }; | |
80 | ||
02f014d8 | 81 | typedef int (*nfqnl_cmpfn)(struct nf_queue_entry *, unsigned long); |
7af4cc3f | 82 | |
c7d03a00 | 83 | static unsigned int nfnl_queue_net_id __read_mostly; |
7af4cc3f | 84 | |
7af4cc3f | 85 | #define INSTANCE_BUCKETS 16 |
e8179610 G |
86 | struct nfnl_queue_net { |
87 | spinlock_t instances_lock; | |
88 | struct hlist_head instance_table[INSTANCE_BUCKETS]; | |
89 | }; | |
90 | ||
91 | static struct nfnl_queue_net *nfnl_queue_pernet(struct net *net) | |
92 | { | |
93 | return net_generic(net, nfnl_queue_net_id); | |
94 | } | |
7af4cc3f HW |
95 | |
96 | static inline u_int8_t instance_hashfn(u_int16_t queue_num) | |
97 | { | |
1cdb0905 | 98 | return ((queue_num >> 8) ^ queue_num) % INSTANCE_BUCKETS; |
7af4cc3f HW |
99 | } |
100 | ||
101 | static struct nfqnl_instance * | |
e8179610 | 102 | instance_lookup(struct nfnl_queue_net *q, u_int16_t queue_num) |
7af4cc3f HW |
103 | { |
104 | struct hlist_head *head; | |
7af4cc3f HW |
105 | struct nfqnl_instance *inst; |
106 | ||
e8179610 | 107 | head = &q->instance_table[instance_hashfn(queue_num)]; |
b67bfe0d | 108 | hlist_for_each_entry_rcu(inst, head, hlist) { |
7af4cc3f HW |
109 | if (inst->queue_num == queue_num) |
110 | return inst; | |
111 | } | |
112 | return NULL; | |
113 | } | |
114 | ||
7af4cc3f | 115 | static struct nfqnl_instance * |
cc6bc448 | 116 | instance_create(struct nfnl_queue_net *q, u_int16_t queue_num, u32 portid) |
7af4cc3f | 117 | { |
baab2ce7 | 118 | struct nfqnl_instance *inst; |
9872bec7 | 119 | unsigned int h; |
baab2ce7 | 120 | int err; |
7af4cc3f | 121 | |
e8179610 G |
122 | spin_lock(&q->instances_lock); |
123 | if (instance_lookup(q, queue_num)) { | |
baab2ce7 | 124 | err = -EEXIST; |
7af4cc3f | 125 | goto out_unlock; |
baab2ce7 | 126 | } |
7af4cc3f | 127 | |
10dfdc69 | 128 | inst = kzalloc(sizeof(*inst), GFP_ATOMIC); |
baab2ce7 PM |
129 | if (!inst) { |
130 | err = -ENOMEM; | |
7af4cc3f | 131 | goto out_unlock; |
baab2ce7 | 132 | } |
7af4cc3f | 133 | |
7af4cc3f | 134 | inst->queue_num = queue_num; |
15e47304 | 135 | inst->peer_portid = portid; |
7af4cc3f | 136 | inst->queue_maxlen = NFQNL_QMAX_DEFAULT; |
9cefbbc9 | 137 | inst->copy_range = NFQNL_MAX_COPY_RANGE; |
7af4cc3f | 138 | inst->copy_mode = NFQNL_COPY_NONE; |
181a46a5 | 139 | spin_lock_init(&inst->lock); |
7af4cc3f HW |
140 | INIT_LIST_HEAD(&inst->queue_list); |
141 | ||
baab2ce7 PM |
142 | if (!try_module_get(THIS_MODULE)) { |
143 | err = -EAGAIN; | |
7af4cc3f | 144 | goto out_free; |
baab2ce7 | 145 | } |
7af4cc3f | 146 | |
9872bec7 | 147 | h = instance_hashfn(queue_num); |
e8179610 | 148 | hlist_add_head_rcu(&inst->hlist, &q->instance_table[h]); |
7af4cc3f | 149 | |
e8179610 | 150 | spin_unlock(&q->instances_lock); |
7af4cc3f | 151 | |
7af4cc3f HW |
152 | return inst; |
153 | ||
154 | out_free: | |
155 | kfree(inst); | |
156 | out_unlock: | |
e8179610 | 157 | spin_unlock(&q->instances_lock); |
baab2ce7 | 158 | return ERR_PTR(err); |
7af4cc3f HW |
159 | } |
160 | ||
b43d8d85 PM |
161 | static void nfqnl_flush(struct nfqnl_instance *queue, nfqnl_cmpfn cmpfn, |
162 | unsigned long data); | |
7af4cc3f HW |
163 | |
164 | static void | |
9872bec7 | 165 | instance_destroy_rcu(struct rcu_head *head) |
7af4cc3f | 166 | { |
9872bec7 PM |
167 | struct nfqnl_instance *inst = container_of(head, struct nfqnl_instance, |
168 | rcu); | |
7af4cc3f | 169 | |
b43d8d85 | 170 | nfqnl_flush(inst, NULL, 0); |
9872bec7 | 171 | kfree(inst); |
7af4cc3f HW |
172 | module_put(THIS_MODULE); |
173 | } | |
174 | ||
9872bec7 | 175 | static void |
7af4cc3f HW |
176 | __instance_destroy(struct nfqnl_instance *inst) |
177 | { | |
9872bec7 PM |
178 | hlist_del_rcu(&inst->hlist); |
179 | call_rcu(&inst->rcu, instance_destroy_rcu); | |
7af4cc3f HW |
180 | } |
181 | ||
9872bec7 | 182 | static void |
e8179610 | 183 | instance_destroy(struct nfnl_queue_net *q, struct nfqnl_instance *inst) |
7af4cc3f | 184 | { |
e8179610 | 185 | spin_lock(&q->instances_lock); |
9872bec7 | 186 | __instance_destroy(inst); |
e8179610 | 187 | spin_unlock(&q->instances_lock); |
7af4cc3f HW |
188 | } |
189 | ||
7af4cc3f | 190 | static inline void |
02f014d8 | 191 | __enqueue_entry(struct nfqnl_instance *queue, struct nf_queue_entry *entry) |
7af4cc3f | 192 | { |
0ac41e81 | 193 | list_add_tail(&entry->list, &queue->queue_list); |
7af4cc3f HW |
194 | queue->queue_total++; |
195 | } | |
196 | ||
97d32cf9 FW |
197 | static void |
198 | __dequeue_entry(struct nfqnl_instance *queue, struct nf_queue_entry *entry) | |
199 | { | |
200 | list_del(&entry->list); | |
201 | queue->queue_total--; | |
202 | } | |
203 | ||
02f014d8 | 204 | static struct nf_queue_entry * |
b43d8d85 | 205 | find_dequeue_entry(struct nfqnl_instance *queue, unsigned int id) |
7af4cc3f | 206 | { |
02f014d8 | 207 | struct nf_queue_entry *entry = NULL, *i; |
601e68e1 | 208 | |
7af4cc3f | 209 | spin_lock_bh(&queue->lock); |
b43d8d85 PM |
210 | |
211 | list_for_each_entry(i, &queue->queue_list, list) { | |
212 | if (i->id == id) { | |
213 | entry = i; | |
214 | break; | |
215 | } | |
216 | } | |
217 | ||
97d32cf9 FW |
218 | if (entry) |
219 | __dequeue_entry(queue, entry); | |
b43d8d85 | 220 | |
7af4cc3f HW |
221 | spin_unlock_bh(&queue->lock); |
222 | ||
223 | return entry; | |
224 | } | |
225 | ||
368982cd PNA |
226 | static void nfqnl_reinject(struct nf_queue_entry *entry, unsigned int verdict) |
227 | { | |
228 | struct nf_ct_hook *ct_hook; | |
229 | int err; | |
230 | ||
231 | if (verdict == NF_ACCEPT || | |
ad18d7bf | 232 | verdict == NF_REPEAT || |
368982cd PNA |
233 | verdict == NF_STOP) { |
234 | rcu_read_lock(); | |
235 | ct_hook = rcu_dereference(nf_ct_hook); | |
236 | if (ct_hook) { | |
237 | err = ct_hook->update(entry->state.net, entry->skb); | |
238 | if (err < 0) | |
239 | verdict = NF_DROP; | |
240 | } | |
241 | rcu_read_unlock(); | |
242 | } | |
243 | nf_reinject(entry, verdict); | |
244 | } | |
245 | ||
7af4cc3f | 246 | static void |
b43d8d85 | 247 | nfqnl_flush(struct nfqnl_instance *queue, nfqnl_cmpfn cmpfn, unsigned long data) |
7af4cc3f | 248 | { |
02f014d8 | 249 | struct nf_queue_entry *entry, *next; |
b43d8d85 | 250 | |
7af4cc3f | 251 | spin_lock_bh(&queue->lock); |
b43d8d85 PM |
252 | list_for_each_entry_safe(entry, next, &queue->queue_list, list) { |
253 | if (!cmpfn || cmpfn(entry, data)) { | |
254 | list_del(&entry->list); | |
255 | queue->queue_total--; | |
368982cd | 256 | nfqnl_reinject(entry, NF_DROP); |
b43d8d85 PM |
257 | } |
258 | } | |
7af4cc3f HW |
259 | spin_unlock_bh(&queue->lock); |
260 | } | |
261 | ||
496e4ae7 FW |
262 | static int |
263 | nfqnl_put_packet_info(struct sk_buff *nlskb, struct sk_buff *packet, | |
264 | bool csum_verify) | |
7237190d FW |
265 | { |
266 | __u32 flags = 0; | |
267 | ||
268 | if (packet->ip_summed == CHECKSUM_PARTIAL) | |
269 | flags = NFQA_SKB_CSUMNOTREADY; | |
496e4ae7 FW |
270 | else if (csum_verify) |
271 | flags = NFQA_SKB_CSUM_NOTVERIFIED; | |
272 | ||
7237190d FW |
273 | if (skb_is_gso(packet)) |
274 | flags |= NFQA_SKB_GSO; | |
275 | ||
276 | return flags ? nla_put_be32(nlskb, NFQA_SKB_INFO, htonl(flags)) : 0; | |
277 | } | |
278 | ||
08c0cad6 VG |
279 | static int nfqnl_put_sk_uidgid(struct sk_buff *skb, struct sock *sk) |
280 | { | |
281 | const struct cred *cred; | |
282 | ||
a8399231 | 283 | if (!sk_fullsock(sk)) |
08c0cad6 VG |
284 | return 0; |
285 | ||
286 | read_lock_bh(&sk->sk_callback_lock); | |
287 | if (sk->sk_socket && sk->sk_socket->file) { | |
288 | cred = sk->sk_socket->file->f_cred; | |
289 | if (nla_put_be32(skb, NFQA_UID, | |
290 | htonl(from_kuid_munged(&init_user_ns, cred->fsuid)))) | |
291 | goto nla_put_failure; | |
292 | if (nla_put_be32(skb, NFQA_GID, | |
293 | htonl(from_kgid_munged(&init_user_ns, cred->fsgid)))) | |
294 | goto nla_put_failure; | |
295 | } | |
296 | read_unlock_bh(&sk->sk_callback_lock); | |
297 | return 0; | |
298 | ||
299 | nla_put_failure: | |
300 | read_unlock_bh(&sk->sk_callback_lock); | |
301 | return -1; | |
302 | } | |
303 | ||
ef493bd9 RK |
304 | static u32 nfqnl_get_sk_secctx(struct sk_buff *skb, char **secdata) |
305 | { | |
306 | u32 seclen = 0; | |
307 | #if IS_ENABLED(CONFIG_NETWORK_SECMARK) | |
1c55161c CS |
308 | struct lsmblob blob; |
309 | ||
ef493bd9 RK |
310 | if (!skb || !sk_fullsock(skb->sk)) |
311 | return 0; | |
312 | ||
313 | read_lock_bh(&skb->sk->sk_callback_lock); | |
314 | ||
1c55161c CS |
315 | if (skb->secmark) { |
316 | /* lsmblob_init() puts ct->secmark into all of the secids in | |
317 | * blob. security_secid_to_secctx() will know which security | |
318 | * module to use to create the secctx. */ | |
319 | lsmblob_init(&blob, skb->secmark); | |
320 | security_secid_to_secctx(&blob, secdata, &seclen); | |
321 | } | |
ef493bd9 RK |
322 | |
323 | read_unlock_bh(&skb->sk->sk_callback_lock); | |
324 | #endif | |
325 | return seclen; | |
326 | } | |
327 | ||
15824ab2 SB |
328 | static u32 nfqnl_get_bridge_size(struct nf_queue_entry *entry) |
329 | { | |
330 | struct sk_buff *entskb = entry->skb; | |
331 | u32 nlalen = 0; | |
332 | ||
333 | if (entry->state.pf != PF_BRIDGE || !skb_mac_header_was_set(entskb)) | |
334 | return 0; | |
335 | ||
336 | if (skb_vlan_tag_present(entskb)) | |
337 | nlalen += nla_total_size(nla_total_size(sizeof(__be16)) + | |
338 | nla_total_size(sizeof(__be16))); | |
339 | ||
340 | if (entskb->network_header > entskb->mac_header) | |
341 | nlalen += nla_total_size((entskb->network_header - | |
342 | entskb->mac_header)); | |
343 | ||
344 | return nlalen; | |
345 | } | |
346 | ||
347 | static int nfqnl_put_bridge(struct nf_queue_entry *entry, struct sk_buff *skb) | |
348 | { | |
349 | struct sk_buff *entskb = entry->skb; | |
350 | ||
351 | if (entry->state.pf != PF_BRIDGE || !skb_mac_header_was_set(entskb)) | |
352 | return 0; | |
353 | ||
354 | if (skb_vlan_tag_present(entskb)) { | |
355 | struct nlattr *nest; | |
356 | ||
ae0be8de | 357 | nest = nla_nest_start(skb, NFQA_VLAN); |
15824ab2 SB |
358 | if (!nest) |
359 | goto nla_put_failure; | |
360 | ||
361 | if (nla_put_be16(skb, NFQA_VLAN_TCI, htons(entskb->vlan_tci)) || | |
362 | nla_put_be16(skb, NFQA_VLAN_PROTO, entskb->vlan_proto)) | |
363 | goto nla_put_failure; | |
364 | ||
365 | nla_nest_end(skb, nest); | |
366 | } | |
367 | ||
368 | if (entskb->mac_header < entskb->network_header) { | |
369 | int len = (int)(entskb->network_header - entskb->mac_header); | |
370 | ||
371 | if (nla_put(skb, NFQA_L2HDR, len, skb_mac_header(entskb))) | |
372 | goto nla_put_failure; | |
373 | } | |
374 | ||
375 | return 0; | |
376 | ||
377 | nla_put_failure: | |
378 | return -1; | |
379 | } | |
380 | ||
7af4cc3f | 381 | static struct sk_buff * |
74332687 | 382 | nfqnl_build_packet_message(struct net *net, struct nfqnl_instance *queue, |
5863702a ED |
383 | struct nf_queue_entry *entry, |
384 | __be32 **packet_id_ptr) | |
7af4cc3f | 385 | { |
7af4cc3f | 386 | size_t size; |
c5b0db32 | 387 | size_t data_len = 0, cap_len = 0; |
af2806f8 | 388 | unsigned int hlen = 0; |
7af4cc3f | 389 | struct sk_buff *skb; |
5863702a ED |
390 | struct nlattr *nla; |
391 | struct nfqnl_msg_packet_hdr *pmsg; | |
7af4cc3f | 392 | struct nlmsghdr *nlh; |
3e4ead4f JJ |
393 | struct sk_buff *entskb = entry->skb; |
394 | struct net_device *indev; | |
395 | struct net_device *outdev; | |
9cb01766 | 396 | struct nf_conn *ct = NULL; |
3f649ab7 | 397 | enum ip_conntrack_info ctinfo; |
a4b4766c | 398 | struct nfnl_ct_hook *nfnl_ct; |
496e4ae7 | 399 | bool csum_verify; |
ef493bd9 RK |
400 | char *secdata = NULL; |
401 | u32 seclen = 0; | |
7af4cc3f | 402 | |
7e59b3fe | 403 | size = nlmsg_total_size(sizeof(struct nfgenmsg)) |
df6fb868 PM |
404 | + nla_total_size(sizeof(struct nfqnl_msg_packet_hdr)) |
405 | + nla_total_size(sizeof(u_int32_t)) /* ifindex */ | |
406 | + nla_total_size(sizeof(u_int32_t)) /* ifindex */ | |
1109a90c | 407 | #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER) |
df6fb868 PM |
408 | + nla_total_size(sizeof(u_int32_t)) /* ifindex */ |
409 | + nla_total_size(sizeof(u_int32_t)) /* ifindex */ | |
fbcd923c | 410 | #endif |
df6fb868 PM |
411 | + nla_total_size(sizeof(u_int32_t)) /* mark */ |
412 | + nla_total_size(sizeof(struct nfqnl_msg_packet_hw)) | |
7237190d | 413 | + nla_total_size(sizeof(u_int32_t)) /* skbinfo */ |
ae08ce00 ED |
414 | + nla_total_size(sizeof(u_int32_t)); /* cap_len */ |
415 | ||
2456e855 | 416 | if (entskb->tstamp) |
ae08ce00 | 417 | size += nla_total_size(sizeof(struct nfqnl_msg_packet_timestamp)); |
7af4cc3f | 418 | |
15824ab2 SB |
419 | size += nfqnl_get_bridge_size(entry); |
420 | ||
1d1de89b DM |
421 | if (entry->state.hook <= NF_INET_FORWARD || |
422 | (entry->state.hook == NF_INET_POST_ROUTING && entskb->sk == NULL)) | |
496e4ae7 FW |
423 | csum_verify = !skb_csum_unnecessary(entskb); |
424 | else | |
425 | csum_verify = false; | |
426 | ||
1d1de89b | 427 | outdev = entry->state.out; |
3e4ead4f | 428 | |
14cd5d4a | 429 | switch ((enum nfqnl_config_mode)READ_ONCE(queue->copy_mode)) { |
7af4cc3f HW |
430 | case NFQNL_COPY_META: |
431 | case NFQNL_COPY_NONE: | |
7af4cc3f | 432 | break; |
601e68e1 | 433 | |
7af4cc3f | 434 | case NFQNL_COPY_PACKET: |
00bd1cc2 FW |
435 | if (!(queue->flags & NFQA_CFG_F_GSO) && |
436 | entskb->ip_summed == CHECKSUM_PARTIAL && | |
c463ac97 | 437 | skb_checksum_help(entskb)) |
e7dfb09a | 438 | return NULL; |
c463ac97 | 439 | |
14cd5d4a | 440 | data_len = READ_ONCE(queue->copy_range); |
9cefbbc9 | 441 | if (data_len > entskb->len) |
3e4ead4f | 442 | data_len = entskb->len; |
601e68e1 | 443 | |
af2806f8 TG |
444 | hlen = skb_zerocopy_headlen(entskb); |
445 | hlen = min_t(unsigned int, hlen, data_len); | |
ae08ce00 | 446 | size += sizeof(struct nlattr) + hlen; |
6ee584be | 447 | cap_len = entskb->len; |
7af4cc3f | 448 | break; |
7af4cc3f HW |
449 | } |
450 | ||
8e662164 AB |
451 | nfnl_ct = rcu_dereference(nfnl_ct_hook); |
452 | ||
83ace77f | 453 | #if IS_ENABLED(CONFIG_NF_CONNTRACK) |
b7bd1809 | 454 | if (queue->flags & NFQA_CFG_F_CONNTRACK) { |
a4b4766c | 455 | if (nfnl_ct != NULL) { |
83ace77f | 456 | ct = nf_ct_get(entskb, &ctinfo); |
b7bd1809 | 457 | if (ct != NULL) |
a4b4766c | 458 | size += nfnl_ct->build_size(ct); |
b7bd1809 PNA |
459 | } |
460 | } | |
83ace77f | 461 | #endif |
7af4cc3f | 462 | |
08c0cad6 | 463 | if (queue->flags & NFQA_CFG_F_UID_GID) { |
7e59b3fe | 464 | size += (nla_total_size(sizeof(u_int32_t)) /* uid */ |
08c0cad6 VG |
465 | + nla_total_size(sizeof(u_int32_t))); /* gid */ |
466 | } | |
467 | ||
ef493bd9 RK |
468 | if ((queue->flags & NFQA_CFG_F_SECCTX) && entskb->sk) { |
469 | seclen = nfqnl_get_sk_secctx(entskb, &secdata); | |
470 | if (seclen) | |
471 | size += nla_total_size(seclen); | |
472 | } | |
473 | ||
c5b0db32 | 474 | skb = alloc_skb(size, GFP_ATOMIC); |
36d5fe6a ZK |
475 | if (!skb) { |
476 | skb_tx_error(entskb); | |
77c1c03c | 477 | goto nlmsg_failure; |
36d5fe6a | 478 | } |
601e68e1 | 479 | |
19c28b13 PNA |
480 | nlh = nfnl_msg_put(skb, 0, 0, |
481 | nfnl_msg_type(NFNL_SUBSYS_QUEUE, NFQNL_MSG_PACKET), | |
482 | 0, entry->state.pf, NFNETLINK_V0, | |
483 | htons(queue->queue_num)); | |
3da07c0c | 484 | if (!nlh) { |
36d5fe6a | 485 | skb_tx_error(entskb); |
3da07c0c | 486 | kfree_skb(skb); |
77c1c03c | 487 | goto nlmsg_failure; |
3da07c0c | 488 | } |
7af4cc3f | 489 | |
5863702a ED |
490 | nla = __nla_reserve(skb, NFQA_PACKET_HDR, sizeof(*pmsg)); |
491 | pmsg = nla_data(nla); | |
492 | pmsg->hw_protocol = entskb->protocol; | |
1d1de89b | 493 | pmsg->hook = entry->state.hook; |
5863702a | 494 | *packet_id_ptr = &pmsg->packet_id; |
7af4cc3f | 495 | |
1d1de89b | 496 | indev = entry->state.in; |
3e4ead4f | 497 | if (indev) { |
1109a90c | 498 | #if !IS_ENABLED(CONFIG_BRIDGE_NETFILTER) |
a447189e DM |
499 | if (nla_put_be32(skb, NFQA_IFINDEX_INDEV, htonl(indev->ifindex))) |
500 | goto nla_put_failure; | |
fbcd923c | 501 | #else |
1d1de89b | 502 | if (entry->state.pf == PF_BRIDGE) { |
fbcd923c | 503 | /* Case 1: indev is physical input device, we need to |
601e68e1 | 504 | * look for bridge group (when called from |
fbcd923c | 505 | * netfilter_bridge) */ |
a447189e DM |
506 | if (nla_put_be32(skb, NFQA_IFINDEX_PHYSINDEV, |
507 | htonl(indev->ifindex)) || | |
fbcd923c | 508 | /* this is the bridge group "brX" */ |
f350a0a8 | 509 | /* rcu_read_lock()ed by __nf_queue */ |
a447189e DM |
510 | nla_put_be32(skb, NFQA_IFINDEX_INDEV, |
511 | htonl(br_port_get_rcu(indev)->br->dev->ifindex))) | |
512 | goto nla_put_failure; | |
fbcd923c | 513 | } else { |
c737b7c4 FW |
514 | int physinif; |
515 | ||
fbcd923c HW |
516 | /* Case 2: indev is bridge group, we need to look for |
517 | * physical device (when called from ipv4) */ | |
a447189e DM |
518 | if (nla_put_be32(skb, NFQA_IFINDEX_INDEV, |
519 | htonl(indev->ifindex))) | |
520 | goto nla_put_failure; | |
c737b7c4 FW |
521 | |
522 | physinif = nf_bridge_get_physinif(entskb); | |
523 | if (physinif && | |
a447189e | 524 | nla_put_be32(skb, NFQA_IFINDEX_PHYSINDEV, |
c737b7c4 | 525 | htonl(physinif))) |
a447189e | 526 | goto nla_put_failure; |
fbcd923c HW |
527 | } |
528 | #endif | |
7af4cc3f HW |
529 | } |
530 | ||
3e4ead4f | 531 | if (outdev) { |
1109a90c | 532 | #if !IS_ENABLED(CONFIG_BRIDGE_NETFILTER) |
a447189e DM |
533 | if (nla_put_be32(skb, NFQA_IFINDEX_OUTDEV, htonl(outdev->ifindex))) |
534 | goto nla_put_failure; | |
fbcd923c | 535 | #else |
1d1de89b | 536 | if (entry->state.pf == PF_BRIDGE) { |
fbcd923c | 537 | /* Case 1: outdev is physical output device, we need to |
601e68e1 | 538 | * look for bridge group (when called from |
fbcd923c | 539 | * netfilter_bridge) */ |
a447189e DM |
540 | if (nla_put_be32(skb, NFQA_IFINDEX_PHYSOUTDEV, |
541 | htonl(outdev->ifindex)) || | |
fbcd923c | 542 | /* this is the bridge group "brX" */ |
f350a0a8 | 543 | /* rcu_read_lock()ed by __nf_queue */ |
a447189e DM |
544 | nla_put_be32(skb, NFQA_IFINDEX_OUTDEV, |
545 | htonl(br_port_get_rcu(outdev)->br->dev->ifindex))) | |
546 | goto nla_put_failure; | |
fbcd923c | 547 | } else { |
c737b7c4 FW |
548 | int physoutif; |
549 | ||
fbcd923c HW |
550 | /* Case 2: outdev is bridge group, we need to look for |
551 | * physical output device (when called from ipv4) */ | |
a447189e DM |
552 | if (nla_put_be32(skb, NFQA_IFINDEX_OUTDEV, |
553 | htonl(outdev->ifindex))) | |
554 | goto nla_put_failure; | |
c737b7c4 FW |
555 | |
556 | physoutif = nf_bridge_get_physoutif(entskb); | |
557 | if (physoutif && | |
a447189e | 558 | nla_put_be32(skb, NFQA_IFINDEX_PHYSOUTDEV, |
c737b7c4 | 559 | htonl(physoutif))) |
a447189e | 560 | goto nla_put_failure; |
fbcd923c HW |
561 | } |
562 | #endif | |
7af4cc3f HW |
563 | } |
564 | ||
a447189e DM |
565 | if (entskb->mark && |
566 | nla_put_be32(skb, NFQA_MARK, htonl(entskb->mark))) | |
567 | goto nla_put_failure; | |
7af4cc3f | 568 | |
2c38de4c NC |
569 | if (indev && entskb->dev && |
570 | entskb->mac_header != entskb->network_header) { | |
7af4cc3f | 571 | struct nfqnl_msg_packet_hw phw; |
e4d091d7 DC |
572 | int len; |
573 | ||
574 | memset(&phw, 0, sizeof(phw)); | |
575 | len = dev_parse_header(entskb, phw.hw_addr); | |
b95cce35 SH |
576 | if (len) { |
577 | phw.hw_addrlen = htons(len); | |
a447189e DM |
578 | if (nla_put(skb, NFQA_HWADDR, sizeof(phw), &phw)) |
579 | goto nla_put_failure; | |
b95cce35 | 580 | } |
7af4cc3f HW |
581 | } |
582 | ||
15824ab2 SB |
583 | if (nfqnl_put_bridge(entry, skb) < 0) |
584 | goto nla_put_failure; | |
585 | ||
916f6efa | 586 | if (entry->state.hook <= NF_INET_FORWARD && entskb->tstamp) { |
7af4cc3f | 587 | struct nfqnl_msg_packet_timestamp ts; |
a7f18845 | 588 | struct timespec64 kts = ktime_to_timespec64(entskb->tstamp); |
b28b1e82 PNA |
589 | |
590 | ts.sec = cpu_to_be64(kts.tv_sec); | |
591 | ts.usec = cpu_to_be64(kts.tv_nsec / NSEC_PER_USEC); | |
7af4cc3f | 592 | |
a447189e DM |
593 | if (nla_put(skb, NFQA_TIMESTAMP, sizeof(ts), &ts)) |
594 | goto nla_put_failure; | |
7af4cc3f HW |
595 | } |
596 | ||
08c0cad6 VG |
597 | if ((queue->flags & NFQA_CFG_F_UID_GID) && entskb->sk && |
598 | nfqnl_put_sk_uidgid(skb, entskb->sk) < 0) | |
599 | goto nla_put_failure; | |
600 | ||
ef493bd9 RK |
601 | if (seclen && nla_put(skb, NFQA_SECCTX, seclen, secdata)) |
602 | goto nla_put_failure; | |
603 | ||
a4b4766c | 604 | if (ct && nfnl_ct->build(skb, ct, ctinfo, NFQA_CT, NFQA_CT_INFO) < 0) |
ae08ce00 ED |
605 | goto nla_put_failure; |
606 | ||
7f87712c FW |
607 | if (cap_len > data_len && |
608 | nla_put_be32(skb, NFQA_CAP_LEN, htonl(cap_len))) | |
ae08ce00 ED |
609 | goto nla_put_failure; |
610 | ||
496e4ae7 | 611 | if (nfqnl_put_packet_info(skb, entskb, csum_verify)) |
7237190d FW |
612 | goto nla_put_failure; |
613 | ||
7af4cc3f | 614 | if (data_len) { |
df6fb868 | 615 | struct nlattr *nla; |
7af4cc3f | 616 | |
ae08ce00 ED |
617 | if (skb_tailroom(skb) < sizeof(*nla) + hlen) |
618 | goto nla_put_failure; | |
7af4cc3f | 619 | |
4df864c1 | 620 | nla = skb_put(skb, sizeof(*nla)); |
df6fb868 | 621 | nla->nla_type = NFQA_PAYLOAD; |
ae08ce00 | 622 | nla->nla_len = nla_attr_size(data_len); |
7af4cc3f | 623 | |
36d5fe6a ZK |
624 | if (skb_zerocopy(skb, entskb, data_len, hlen)) |
625 | goto nla_put_failure; | |
7af4cc3f | 626 | } |
601e68e1 | 627 | |
ae08ce00 | 628 | nlh->nlmsg_len = skb->len; |
77c1c03c LZ |
629 | if (seclen) |
630 | security_release_secctx(secdata, seclen); | |
7af4cc3f HW |
631 | return skb; |
632 | ||
df6fb868 | 633 | nla_put_failure: |
36d5fe6a | 634 | skb_tx_error(entskb); |
a6729955 | 635 | kfree_skb(skb); |
e87cc472 | 636 | net_err_ratelimited("nf_queue: error creating packet message\n"); |
77c1c03c LZ |
637 | nlmsg_failure: |
638 | if (seclen) | |
639 | security_release_secctx(secdata, seclen); | |
7af4cc3f HW |
640 | return NULL; |
641 | } | |
642 | ||
5da773a3 FW |
643 | static bool nf_ct_drop_unconfirmed(const struct nf_queue_entry *entry) |
644 | { | |
645 | #if IS_ENABLED(CONFIG_NF_CONNTRACK) | |
646 | static const unsigned long flags = IPS_CONFIRMED | IPS_DYING; | |
647 | const struct nf_conn *ct = (void *)skb_nfct(entry->skb); | |
648 | ||
649 | if (ct && ((ct->status & flags) == IPS_DYING)) | |
650 | return true; | |
651 | #endif | |
652 | return false; | |
653 | } | |
654 | ||
7af4cc3f | 655 | static int |
a5fedd43 FW |
656 | __nfqnl_enqueue_packet(struct net *net, struct nfqnl_instance *queue, |
657 | struct nf_queue_entry *entry) | |
7af4cc3f | 658 | { |
7af4cc3f | 659 | struct sk_buff *nskb; |
f1585086 | 660 | int err = -ENOBUFS; |
5863702a | 661 | __be32 *packet_id_ptr; |
fdb694a0 | 662 | int failopen = 0; |
7af4cc3f | 663 | |
74332687 | 664 | nskb = nfqnl_build_packet_message(net, queue, entry, &packet_id_ptr); |
f1585086 FW |
665 | if (nskb == NULL) { |
666 | err = -ENOMEM; | |
0ef0f465 | 667 | goto err_out; |
f1585086 | 668 | } |
7af4cc3f | 669 | spin_lock_bh(&queue->lock); |
601e68e1 | 670 | |
5da773a3 FW |
671 | if (nf_ct_drop_unconfirmed(entry)) |
672 | goto err_out_free_nskb; | |
673 | ||
7af4cc3f | 674 | if (queue->queue_total >= queue->queue_maxlen) { |
fdb694a0 KK |
675 | if (queue->flags & NFQA_CFG_F_FAIL_OPEN) { |
676 | failopen = 1; | |
677 | err = 0; | |
678 | } else { | |
679 | queue->queue_dropped++; | |
680 | net_warn_ratelimited("nf_queue: full at %d entries, dropping packets(s)\n", | |
681 | queue->queue_total); | |
682 | } | |
7af4cc3f HW |
683 | goto err_out_free_nskb; |
684 | } | |
5863702a ED |
685 | entry->id = ++queue->id_sequence; |
686 | *packet_id_ptr = htonl(entry->id); | |
7af4cc3f HW |
687 | |
688 | /* nfnetlink_unicast will either free the nskb or add it to a socket */ | |
ee921183 | 689 | err = nfnetlink_unicast(nskb, net, queue->peer_portid); |
0ef0f465 | 690 | if (err < 0) { |
93140113 PNA |
691 | if (queue->flags & NFQA_CFG_F_FAIL_OPEN) { |
692 | failopen = 1; | |
693 | err = 0; | |
694 | } else { | |
695 | queue->queue_user_dropped++; | |
696 | } | |
7af4cc3f HW |
697 | goto err_out_unlock; |
698 | } | |
699 | ||
700 | __enqueue_entry(queue, entry); | |
701 | ||
702 | spin_unlock_bh(&queue->lock); | |
0ef0f465 | 703 | return 0; |
7af4cc3f HW |
704 | |
705 | err_out_free_nskb: | |
601e68e1 | 706 | kfree_skb(nskb); |
7af4cc3f HW |
707 | err_out_unlock: |
708 | spin_unlock_bh(&queue->lock); | |
fdb694a0 | 709 | if (failopen) |
368982cd | 710 | nfqnl_reinject(entry, NF_ACCEPT); |
0ef0f465 | 711 | err_out: |
f1585086 | 712 | return err; |
7af4cc3f HW |
713 | } |
714 | ||
a5fedd43 FW |
715 | static struct nf_queue_entry * |
716 | nf_queue_entry_dup(struct nf_queue_entry *e) | |
717 | { | |
718 | struct nf_queue_entry *entry = kmemdup(e, e->size, GFP_ATOMIC); | |
ed78d09d FW |
719 | if (entry) |
720 | nf_queue_entry_get_refs(entry); | |
721 | return entry; | |
a5fedd43 FW |
722 | } |
723 | ||
1109a90c | 724 | #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER) |
a5fedd43 FW |
725 | /* When called from bridge netfilter, skb->data must point to MAC header |
726 | * before calling skb_gso_segment(). Else, original MAC header is lost | |
727 | * and segmented skbs will be sent to wrong destination. | |
728 | */ | |
729 | static void nf_bridge_adjust_skb_data(struct sk_buff *skb) | |
730 | { | |
c4b0e771 | 731 | if (nf_bridge_info_get(skb)) |
a5fedd43 FW |
732 | __skb_push(skb, skb->network_header - skb->mac_header); |
733 | } | |
734 | ||
735 | static void nf_bridge_adjust_segmented_data(struct sk_buff *skb) | |
736 | { | |
c4b0e771 | 737 | if (nf_bridge_info_get(skb)) |
a5fedd43 FW |
738 | __skb_pull(skb, skb->network_header - skb->mac_header); |
739 | } | |
740 | #else | |
741 | #define nf_bridge_adjust_skb_data(s) do {} while (0) | |
742 | #define nf_bridge_adjust_segmented_data(s) do {} while (0) | |
743 | #endif | |
744 | ||
a5fedd43 FW |
745 | static int |
746 | __nfqnl_enqueue_packet_gso(struct net *net, struct nfqnl_instance *queue, | |
747 | struct sk_buff *skb, struct nf_queue_entry *entry) | |
748 | { | |
749 | int ret = -ENOMEM; | |
750 | struct nf_queue_entry *entry_seg; | |
751 | ||
752 | nf_bridge_adjust_segmented_data(skb); | |
753 | ||
754 | if (skb->next == NULL) { /* last packet, no need to copy entry */ | |
755 | struct sk_buff *gso_skb = entry->skb; | |
756 | entry->skb = skb; | |
757 | ret = __nfqnl_enqueue_packet(net, queue, entry); | |
758 | if (ret) | |
759 | entry->skb = gso_skb; | |
760 | return ret; | |
761 | } | |
762 | ||
a8305bff | 763 | skb_mark_not_on_list(skb); |
a5fedd43 FW |
764 | |
765 | entry_seg = nf_queue_entry_dup(entry); | |
766 | if (entry_seg) { | |
767 | entry_seg->skb = skb; | |
768 | ret = __nfqnl_enqueue_packet(net, queue, entry_seg); | |
769 | if (ret) | |
dd3cc111 | 770 | nf_queue_entry_free(entry_seg); |
a5fedd43 FW |
771 | } |
772 | return ret; | |
773 | } | |
774 | ||
775 | static int | |
776 | nfqnl_enqueue_packet(struct nf_queue_entry *entry, unsigned int queuenum) | |
777 | { | |
778 | unsigned int queued; | |
779 | struct nfqnl_instance *queue; | |
2670ee77 | 780 | struct sk_buff *skb, *segs, *nskb; |
a5fedd43 | 781 | int err = -ENOBUFS; |
9dff2c96 | 782 | struct net *net = entry->state.net; |
a5fedd43 FW |
783 | struct nfnl_queue_net *q = nfnl_queue_pernet(net); |
784 | ||
e2361cb9 | 785 | /* rcu_read_lock()ed by nf_hook_thresh */ |
a5fedd43 FW |
786 | queue = instance_lookup(q, queuenum); |
787 | if (!queue) | |
788 | return -ESRCH; | |
789 | ||
790 | if (queue->copy_mode == NFQNL_COPY_NONE) | |
791 | return -EINVAL; | |
792 | ||
a5fedd43 FW |
793 | skb = entry->skb; |
794 | ||
1d1de89b | 795 | switch (entry->state.pf) { |
a5fedd43 FW |
796 | case NFPROTO_IPV4: |
797 | skb->protocol = htons(ETH_P_IP); | |
798 | break; | |
799 | case NFPROTO_IPV6: | |
800 | skb->protocol = htons(ETH_P_IPV6); | |
801 | break; | |
802 | } | |
803 | ||
7b8dfe28 PNA |
804 | if ((queue->flags & NFQA_CFG_F_GSO) || !skb_is_gso(skb)) |
805 | return __nfqnl_enqueue_packet(net, queue, entry); | |
806 | ||
a5fedd43 FW |
807 | nf_bridge_adjust_skb_data(skb); |
808 | segs = skb_gso_segment(skb, 0); | |
809 | /* Does not use PTR_ERR to limit the number of error codes that can be | |
ed78d09d | 810 | * returned by nf_queue. For instance, callers rely on -ESRCH to |
a5fedd43 FW |
811 | * mean 'ignore this hook'. |
812 | */ | |
330966e5 | 813 | if (IS_ERR_OR_NULL(segs)) |
a5fedd43 FW |
814 | goto out_err; |
815 | queued = 0; | |
816 | err = 0; | |
2670ee77 | 817 | skb_list_walk_safe(segs, segs, nskb) { |
a5fedd43 FW |
818 | if (err == 0) |
819 | err = __nfqnl_enqueue_packet_gso(net, queue, | |
820 | segs, entry); | |
821 | if (err == 0) | |
822 | queued++; | |
823 | else | |
824 | kfree_skb(segs); | |
2670ee77 | 825 | } |
a5fedd43 FW |
826 | |
827 | if (queued) { | |
828 | if (err) /* some segments are already queued */ | |
dd3cc111 | 829 | nf_queue_entry_free(entry); |
a5fedd43 FW |
830 | kfree_skb(skb); |
831 | return 0; | |
832 | } | |
833 | out_err: | |
834 | nf_bridge_adjust_segmented_data(skb); | |
835 | return err; | |
836 | } | |
837 | ||
7af4cc3f | 838 | static int |
8c88f87c | 839 | nfqnl_mangle(void *data, int data_len, struct nf_queue_entry *e, int diff) |
7af4cc3f | 840 | { |
e2b58a67 | 841 | struct sk_buff *nskb; |
7af4cc3f | 842 | |
d8a585d7 PM |
843 | if (diff < 0) { |
844 | if (pskb_trim(e->skb, data_len)) | |
845 | return -ENOMEM; | |
846 | } else if (diff > 0) { | |
7af4cc3f HW |
847 | if (data_len > 0xFFFF) |
848 | return -EINVAL; | |
849 | if (diff > skb_tailroom(e->skb)) { | |
9a732ed6 AE |
850 | nskb = skb_copy_expand(e->skb, skb_headroom(e->skb), |
851 | diff, GFP_ATOMIC); | |
5191d70f | 852 | if (!nskb) |
e2b58a67 | 853 | return -ENOMEM; |
e2b58a67 PM |
854 | kfree_skb(e->skb); |
855 | e->skb = nskb; | |
7af4cc3f HW |
856 | } |
857 | skb_put(e->skb, diff); | |
858 | } | |
2cf6bffc | 859 | if (skb_ensure_writable(e->skb, data_len)) |
7af4cc3f | 860 | return -ENOMEM; |
27d7ff46 | 861 | skb_copy_to_linear_data(e->skb, data, data_len); |
e7dfb09a | 862 | e->skb->ip_summed = CHECKSUM_NONE; |
7af4cc3f HW |
863 | return 0; |
864 | } | |
865 | ||
7af4cc3f HW |
866 | static int |
867 | nfqnl_set_mode(struct nfqnl_instance *queue, | |
868 | unsigned char mode, unsigned int range) | |
869 | { | |
c5de0dfd | 870 | int status = 0; |
7af4cc3f HW |
871 | |
872 | spin_lock_bh(&queue->lock); | |
c5de0dfd PM |
873 | switch (mode) { |
874 | case NFQNL_COPY_NONE: | |
875 | case NFQNL_COPY_META: | |
876 | queue->copy_mode = mode; | |
877 | queue->copy_range = 0; | |
878 | break; | |
879 | ||
880 | case NFQNL_COPY_PACKET: | |
881 | queue->copy_mode = mode; | |
9cefbbc9 FW |
882 | if (range == 0 || range > NFQNL_MAX_COPY_RANGE) |
883 | queue->copy_range = NFQNL_MAX_COPY_RANGE; | |
c5de0dfd PM |
884 | else |
885 | queue->copy_range = range; | |
886 | break; | |
887 | ||
888 | default: | |
889 | status = -EINVAL; | |
890 | ||
891 | } | |
7af4cc3f HW |
892 | spin_unlock_bh(&queue->lock); |
893 | ||
894 | return status; | |
895 | } | |
896 | ||
897 | static int | |
02f014d8 | 898 | dev_cmp(struct nf_queue_entry *entry, unsigned long ifindex) |
7af4cc3f | 899 | { |
c4b0e771 FW |
900 | #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER) |
901 | int physinif, physoutif; | |
902 | ||
903 | physinif = nf_bridge_get_physinif(entry->skb); | |
904 | physoutif = nf_bridge_get_physoutif(entry->skb); | |
905 | ||
906 | if (physinif == ifindex || physoutif == ifindex) | |
907 | return 1; | |
908 | #endif | |
1d1de89b DM |
909 | if (entry->state.in) |
910 | if (entry->state.in->ifindex == ifindex) | |
7af4cc3f | 911 | return 1; |
1d1de89b DM |
912 | if (entry->state.out) |
913 | if (entry->state.out->ifindex == ifindex) | |
7af4cc3f | 914 | return 1; |
c737b7c4 | 915 | |
7af4cc3f HW |
916 | return 0; |
917 | } | |
918 | ||
919 | /* drop all packets with either indev or outdev == ifindex from all queue | |
920 | * instances */ | |
921 | static void | |
e8179610 | 922 | nfqnl_dev_drop(struct net *net, int ifindex) |
7af4cc3f HW |
923 | { |
924 | int i; | |
e8179610 | 925 | struct nfnl_queue_net *q = nfnl_queue_pernet(net); |
601e68e1 | 926 | |
9872bec7 | 927 | rcu_read_lock(); |
7af4cc3f | 928 | |
9872bec7 | 929 | for (i = 0; i < INSTANCE_BUCKETS; i++) { |
7af4cc3f | 930 | struct nfqnl_instance *inst; |
e8179610 | 931 | struct hlist_head *head = &q->instance_table[i]; |
7af4cc3f | 932 | |
b67bfe0d | 933 | hlist_for_each_entry_rcu(inst, head, hlist) |
b43d8d85 | 934 | nfqnl_flush(inst, dev_cmp, ifindex); |
7af4cc3f HW |
935 | } |
936 | ||
9872bec7 | 937 | rcu_read_unlock(); |
7af4cc3f HW |
938 | } |
939 | ||
7af4cc3f HW |
940 | static int |
941 | nfqnl_rcv_dev_event(struct notifier_block *this, | |
942 | unsigned long event, void *ptr) | |
943 | { | |
351638e7 | 944 | struct net_device *dev = netdev_notifier_info_to_dev(ptr); |
7af4cc3f HW |
945 | |
946 | /* Drop any packets associated with the downed device */ | |
947 | if (event == NETDEV_DOWN) | |
e8179610 | 948 | nfqnl_dev_drop(dev_net(dev), dev->ifindex); |
7af4cc3f HW |
949 | return NOTIFY_DONE; |
950 | } | |
951 | ||
952 | static struct notifier_block nfqnl_dev_notifier = { | |
953 | .notifier_call = nfqnl_rcv_dev_event, | |
954 | }; | |
955 | ||
26888dfd | 956 | static void nfqnl_nf_hook_drop(struct net *net) |
8405a8ff EB |
957 | { |
958 | struct nfnl_queue_net *q = nfnl_queue_pernet(net); | |
959 | int i; | |
960 | ||
87029970 FW |
961 | /* This function is also called on net namespace error unwind, |
962 | * when pernet_ops->init() failed and ->exit() functions of the | |
963 | * previous pernet_ops gets called. | |
964 | * | |
965 | * This may result in a call to nfqnl_nf_hook_drop() before | |
966 | * struct nfnl_queue_net was allocated. | |
967 | */ | |
968 | if (!q) | |
969 | return; | |
970 | ||
8405a8ff EB |
971 | for (i = 0; i < INSTANCE_BUCKETS; i++) { |
972 | struct nfqnl_instance *inst; | |
973 | struct hlist_head *head = &q->instance_table[i]; | |
974 | ||
26888dfd | 975 | hlist_for_each_entry_rcu(inst, head, hlist) |
039b40ee | 976 | nfqnl_flush(inst, NULL, 0); |
8405a8ff | 977 | } |
8405a8ff EB |
978 | } |
979 | ||
7af4cc3f HW |
980 | static int |
981 | nfqnl_rcv_nl_event(struct notifier_block *this, | |
982 | unsigned long event, void *ptr) | |
983 | { | |
984 | struct netlink_notify *n = ptr; | |
e8179610 | 985 | struct nfnl_queue_net *q = nfnl_queue_pernet(n->net); |
7af4cc3f | 986 | |
dee5817e | 987 | if (event == NETLINK_URELEASE && n->protocol == NETLINK_NETFILTER) { |
7af4cc3f HW |
988 | int i; |
989 | ||
15e47304 | 990 | /* destroy all instances for this portid */ |
e8179610 | 991 | spin_lock(&q->instances_lock); |
9872bec7 | 992 | for (i = 0; i < INSTANCE_BUCKETS; i++) { |
b67bfe0d | 993 | struct hlist_node *t2; |
7af4cc3f | 994 | struct nfqnl_instance *inst; |
e8179610 | 995 | struct hlist_head *head = &q->instance_table[i]; |
7af4cc3f | 996 | |
b67bfe0d | 997 | hlist_for_each_entry_safe(inst, t2, head, hlist) { |
e8179610 | 998 | if (n->portid == inst->peer_portid) |
7af4cc3f HW |
999 | __instance_destroy(inst); |
1000 | } | |
1001 | } | |
e8179610 | 1002 | spin_unlock(&q->instances_lock); |
7af4cc3f HW |
1003 | } |
1004 | return NOTIFY_DONE; | |
1005 | } | |
1006 | ||
1007 | static struct notifier_block nfqnl_rtnl_notifier = { | |
1008 | .notifier_call = nfqnl_rcv_nl_event, | |
1009 | }; | |
1010 | ||
8d45ff22 SB |
1011 | static const struct nla_policy nfqa_vlan_policy[NFQA_VLAN_MAX + 1] = { |
1012 | [NFQA_VLAN_TCI] = { .type = NLA_U16}, | |
1013 | [NFQA_VLAN_PROTO] = { .type = NLA_U16}, | |
1014 | }; | |
1015 | ||
5bf75853 PM |
1016 | static const struct nla_policy nfqa_verdict_policy[NFQA_MAX+1] = { |
1017 | [NFQA_VERDICT_HDR] = { .len = sizeof(struct nfqnl_msg_verdict_hdr) }, | |
1018 | [NFQA_MARK] = { .type = NLA_U32 }, | |
1019 | [NFQA_PAYLOAD] = { .type = NLA_UNSPEC }, | |
9cb01766 | 1020 | [NFQA_CT] = { .type = NLA_UNSPEC }, |
bd077937 | 1021 | [NFQA_EXP] = { .type = NLA_UNSPEC }, |
8d45ff22 | 1022 | [NFQA_VLAN] = { .type = NLA_NESTED }, |
838ab636 HW |
1023 | }; |
1024 | ||
97d32cf9 FW |
1025 | static const struct nla_policy nfqa_verdict_batch_policy[NFQA_MAX+1] = { |
1026 | [NFQA_VERDICT_HDR] = { .len = sizeof(struct nfqnl_msg_verdict_hdr) }, | |
1027 | [NFQA_MARK] = { .type = NLA_U32 }, | |
1028 | }; | |
1029 | ||
e8179610 | 1030 | static struct nfqnl_instance * |
cc6bc448 | 1031 | verdict_instance_lookup(struct nfnl_queue_net *q, u16 queue_num, u32 nlportid) |
97d32cf9 FW |
1032 | { |
1033 | struct nfqnl_instance *queue; | |
1034 | ||
e8179610 | 1035 | queue = instance_lookup(q, queue_num); |
97d32cf9 FW |
1036 | if (!queue) |
1037 | return ERR_PTR(-ENODEV); | |
1038 | ||
15e47304 | 1039 | if (queue->peer_portid != nlportid) |
97d32cf9 FW |
1040 | return ERR_PTR(-EPERM); |
1041 | ||
1042 | return queue; | |
1043 | } | |
1044 | ||
1045 | static struct nfqnl_msg_verdict_hdr* | |
1046 | verdicthdr_get(const struct nlattr * const nfqa[]) | |
1047 | { | |
1048 | struct nfqnl_msg_verdict_hdr *vhdr; | |
1049 | unsigned int verdict; | |
1050 | ||
1051 | if (!nfqa[NFQA_VERDICT_HDR]) | |
1052 | return NULL; | |
1053 | ||
1054 | vhdr = nla_data(nfqa[NFQA_VERDICT_HDR]); | |
c6675233 FW |
1055 | verdict = ntohl(vhdr->verdict) & NF_VERDICT_MASK; |
1056 | if (verdict > NF_MAX_VERDICT || verdict == NF_STOLEN) | |
97d32cf9 FW |
1057 | return NULL; |
1058 | return vhdr; | |
1059 | } | |
1060 | ||
1061 | static int nfq_id_after(unsigned int id, unsigned int max) | |
1062 | { | |
1063 | return (int)(id - max) > 0; | |
1064 | } | |
1065 | ||
797d4980 PNA |
1066 | static int nfqnl_recv_verdict_batch(struct sk_buff *skb, |
1067 | const struct nfnl_info *info, | |
1068 | const struct nlattr * const nfqa[]) | |
97d32cf9 | 1069 | { |
797d4980 | 1070 | struct nfnl_queue_net *q = nfnl_queue_pernet(info->net); |
ef4b65e5 | 1071 | u16 queue_num = ntohs(info->nfmsg->res_id); |
97d32cf9 | 1072 | struct nf_queue_entry *entry, *tmp; |
97d32cf9 FW |
1073 | struct nfqnl_msg_verdict_hdr *vhdr; |
1074 | struct nfqnl_instance *queue; | |
797d4980 | 1075 | unsigned int verdict, maxid; |
97d32cf9 | 1076 | LIST_HEAD(batch_list); |
e8179610 G |
1077 | |
1078 | queue = verdict_instance_lookup(q, queue_num, | |
1079 | NETLINK_CB(skb).portid); | |
97d32cf9 FW |
1080 | if (IS_ERR(queue)) |
1081 | return PTR_ERR(queue); | |
1082 | ||
1083 | vhdr = verdicthdr_get(nfqa); | |
1084 | if (!vhdr) | |
1085 | return -EINVAL; | |
1086 | ||
1087 | verdict = ntohl(vhdr->verdict); | |
1088 | maxid = ntohl(vhdr->id); | |
1089 | ||
1090 | spin_lock_bh(&queue->lock); | |
1091 | ||
1092 | list_for_each_entry_safe(entry, tmp, &queue->queue_list, list) { | |
1093 | if (nfq_id_after(entry->id, maxid)) | |
1094 | break; | |
1095 | __dequeue_entry(queue, entry); | |
1096 | list_add_tail(&entry->list, &batch_list); | |
1097 | } | |
1098 | ||
1099 | spin_unlock_bh(&queue->lock); | |
1100 | ||
1101 | if (list_empty(&batch_list)) | |
1102 | return -ENOENT; | |
1103 | ||
1104 | list_for_each_entry_safe(entry, tmp, &batch_list, list) { | |
1105 | if (nfqa[NFQA_MARK]) | |
1106 | entry->skb->mark = ntohl(nla_get_be32(nfqa[NFQA_MARK])); | |
368982cd PNA |
1107 | |
1108 | nfqnl_reinject(entry, verdict); | |
97d32cf9 FW |
1109 | } |
1110 | return 0; | |
1111 | } | |
1112 | ||
a4b4766c | 1113 | static struct nf_conn *nfqnl_ct_parse(struct nfnl_ct_hook *nfnl_ct, |
b7bd1809 PNA |
1114 | const struct nlmsghdr *nlh, |
1115 | const struct nlattr * const nfqa[], | |
1116 | struct nf_queue_entry *entry, | |
1117 | enum ip_conntrack_info *ctinfo) | |
1118 | { | |
83ace77f | 1119 | #if IS_ENABLED(CONFIG_NF_CONNTRACK) |
b7bd1809 PNA |
1120 | struct nf_conn *ct; |
1121 | ||
83ace77f | 1122 | ct = nf_ct_get(entry->skb, ctinfo); |
b7bd1809 PNA |
1123 | if (ct == NULL) |
1124 | return NULL; | |
1125 | ||
a4b4766c | 1126 | if (nfnl_ct->parse(nfqa[NFQA_CT], ct) < 0) |
b7bd1809 PNA |
1127 | return NULL; |
1128 | ||
1129 | if (nfqa[NFQA_EXP]) | |
a4b4766c | 1130 | nfnl_ct->attach_expect(nfqa[NFQA_EXP], ct, |
b7bd1809 PNA |
1131 | NETLINK_CB(entry->skb).portid, |
1132 | nlmsg_report(nlh)); | |
1133 | return ct; | |
83ace77f FW |
1134 | #else |
1135 | return NULL; | |
1136 | #endif | |
b7bd1809 PNA |
1137 | } |
1138 | ||
8d45ff22 SB |
1139 | static int nfqa_parse_bridge(struct nf_queue_entry *entry, |
1140 | const struct nlattr * const nfqa[]) | |
1141 | { | |
1142 | if (nfqa[NFQA_VLAN]) { | |
1143 | struct nlattr *tb[NFQA_VLAN_MAX + 1]; | |
1144 | int err; | |
1145 | ||
8cb08174 JB |
1146 | err = nla_parse_nested_deprecated(tb, NFQA_VLAN_MAX, |
1147 | nfqa[NFQA_VLAN], | |
1148 | nfqa_vlan_policy, NULL); | |
8d45ff22 SB |
1149 | if (err < 0) |
1150 | return err; | |
1151 | ||
1152 | if (!tb[NFQA_VLAN_TCI] || !tb[NFQA_VLAN_PROTO]) | |
1153 | return -EINVAL; | |
1154 | ||
82eea4cf MM |
1155 | __vlan_hwaccel_put_tag(entry->skb, |
1156 | nla_get_be16(tb[NFQA_VLAN_PROTO]), | |
1157 | ntohs(nla_get_be16(tb[NFQA_VLAN_TCI]))); | |
8d45ff22 SB |
1158 | } |
1159 | ||
1160 | if (nfqa[NFQA_L2HDR]) { | |
1161 | int mac_header_len = entry->skb->network_header - | |
1162 | entry->skb->mac_header; | |
1163 | ||
1164 | if (mac_header_len != nla_len(nfqa[NFQA_L2HDR])) | |
1165 | return -EINVAL; | |
1166 | else if (mac_header_len > 0) | |
1167 | memcpy(skb_mac_header(entry->skb), | |
1168 | nla_data(nfqa[NFQA_L2HDR]), | |
1169 | mac_header_len); | |
1170 | } | |
1171 | ||
1172 | return 0; | |
1173 | } | |
1174 | ||
797d4980 PNA |
1175 | static int nfqnl_recv_verdict(struct sk_buff *skb, const struct nfnl_info *info, |
1176 | const struct nlattr * const nfqa[]) | |
7af4cc3f | 1177 | { |
797d4980 | 1178 | struct nfnl_queue_net *q = nfnl_queue_pernet(info->net); |
ef4b65e5 | 1179 | u_int16_t queue_num = ntohs(info->nfmsg->res_id); |
7af4cc3f | 1180 | struct nfqnl_msg_verdict_hdr *vhdr; |
797d4980 | 1181 | enum ip_conntrack_info ctinfo; |
7af4cc3f | 1182 | struct nfqnl_instance *queue; |
02f014d8 | 1183 | struct nf_queue_entry *entry; |
a4b4766c | 1184 | struct nfnl_ct_hook *nfnl_ct; |
8c88f87c | 1185 | struct nf_conn *ct = NULL; |
797d4980 | 1186 | unsigned int verdict; |
8d45ff22 | 1187 | int err; |
7af4cc3f | 1188 | |
00a3101f LZ |
1189 | queue = verdict_instance_lookup(q, queue_num, |
1190 | NETLINK_CB(skb).portid); | |
97d32cf9 FW |
1191 | if (IS_ERR(queue)) |
1192 | return PTR_ERR(queue); | |
7af4cc3f | 1193 | |
97d32cf9 FW |
1194 | vhdr = verdicthdr_get(nfqa); |
1195 | if (!vhdr) | |
84a797dd | 1196 | return -EINVAL; |
7af4cc3f | 1197 | |
7af4cc3f HW |
1198 | verdict = ntohl(vhdr->verdict); |
1199 | ||
b43d8d85 | 1200 | entry = find_dequeue_entry(queue, ntohl(vhdr->id)); |
84a797dd ED |
1201 | if (entry == NULL) |
1202 | return -ENOENT; | |
7af4cc3f | 1203 | |
8e662164 AB |
1204 | /* rcu lock already held from nfnl->call_rcu. */ |
1205 | nfnl_ct = rcu_dereference(nfnl_ct_hook); | |
1206 | ||
bd077937 | 1207 | if (nfqa[NFQA_CT]) { |
a4b4766c | 1208 | if (nfnl_ct != NULL) |
797d4980 PNA |
1209 | ct = nfqnl_ct_parse(nfnl_ct, info->nlh, nfqa, entry, |
1210 | &ctinfo); | |
bd077937 | 1211 | } |
9cb01766 | 1212 | |
8d45ff22 SB |
1213 | if (entry->state.pf == PF_BRIDGE) { |
1214 | err = nfqa_parse_bridge(entry, nfqa); | |
1215 | if (err < 0) | |
1216 | return err; | |
1217 | } | |
1218 | ||
df6fb868 | 1219 | if (nfqa[NFQA_PAYLOAD]) { |
8c88f87c PNA |
1220 | u16 payload_len = nla_len(nfqa[NFQA_PAYLOAD]); |
1221 | int diff = payload_len - entry->skb->len; | |
1222 | ||
df6fb868 | 1223 | if (nfqnl_mangle(nla_data(nfqa[NFQA_PAYLOAD]), |
8c88f87c | 1224 | payload_len, entry, diff) < 0) |
7af4cc3f | 1225 | verdict = NF_DROP; |
8c88f87c | 1226 | |
b7bd1809 | 1227 | if (ct && diff) |
a4b4766c | 1228 | nfnl_ct->seq_adjust(entry->skb, ct, ctinfo, diff); |
7af4cc3f HW |
1229 | } |
1230 | ||
df6fb868 | 1231 | if (nfqa[NFQA_MARK]) |
ea3a66ff | 1232 | entry->skb->mark = ntohl(nla_get_be32(nfqa[NFQA_MARK])); |
601e68e1 | 1233 | |
368982cd | 1234 | nfqnl_reinject(entry, verdict); |
7af4cc3f HW |
1235 | return 0; |
1236 | } | |
1237 | ||
797d4980 PNA |
1238 | static int nfqnl_recv_unsupp(struct sk_buff *skb, const struct nfnl_info *info, |
1239 | const struct nlattr * const cda[]) | |
7af4cc3f HW |
1240 | { |
1241 | return -ENOTSUPP; | |
1242 | } | |
1243 | ||
5bf75853 PM |
1244 | static const struct nla_policy nfqa_cfg_policy[NFQA_CFG_MAX+1] = { |
1245 | [NFQA_CFG_CMD] = { .len = sizeof(struct nfqnl_msg_config_cmd) }, | |
1246 | [NFQA_CFG_PARAMS] = { .len = sizeof(struct nfqnl_msg_config_params) }, | |
ba062ebb ED |
1247 | [NFQA_CFG_QUEUE_MAXLEN] = { .type = NLA_U32 }, |
1248 | [NFQA_CFG_MASK] = { .type = NLA_U32 }, | |
1249 | [NFQA_CFG_FLAGS] = { .type = NLA_U32 }, | |
838ab636 HW |
1250 | }; |
1251 | ||
e3ac5298 | 1252 | static const struct nf_queue_handler nfqh = { |
d4ef3835 AS |
1253 | .outfn = nfqnl_enqueue_packet, |
1254 | .nf_hook_drop = nfqnl_nf_hook_drop, | |
bbd86b9f HW |
1255 | }; |
1256 | ||
a6555365 PNA |
1257 | static int nfqnl_recv_config(struct sk_buff *skb, const struct nfnl_info *info, |
1258 | const struct nlattr * const nfqa[]) | |
7af4cc3f | 1259 | { |
a6555365 | 1260 | struct nfnl_queue_net *q = nfnl_queue_pernet(info->net); |
ef4b65e5 | 1261 | u_int16_t queue_num = ntohs(info->nfmsg->res_id); |
9872bec7 | 1262 | struct nfqnl_msg_config_cmd *cmd = NULL; |
a6555365 | 1263 | struct nfqnl_instance *queue; |
60d2c7f9 | 1264 | __u32 flags = 0, mask = 0; |
838ab636 | 1265 | int ret = 0; |
7af4cc3f | 1266 | |
9872bec7 PM |
1267 | if (nfqa[NFQA_CFG_CMD]) { |
1268 | cmd = nla_data(nfqa[NFQA_CFG_CMD]); | |
1269 | ||
0360ae41 | 1270 | /* Obsolete commands without queue context */ |
9872bec7 | 1271 | switch (cmd->command) { |
0360ae41 FW |
1272 | case NFQNL_CFG_CMD_PF_BIND: return 0; |
1273 | case NFQNL_CFG_CMD_PF_UNBIND: return 0; | |
9872bec7 | 1274 | } |
9872bec7 PM |
1275 | } |
1276 | ||
60d2c7f9 KM |
1277 | /* Check if we support these flags in first place, dependencies should |
1278 | * be there too not to break atomicity. | |
1279 | */ | |
1280 | if (nfqa[NFQA_CFG_FLAGS]) { | |
1281 | if (!nfqa[NFQA_CFG_MASK]) { | |
1282 | /* A mask is needed to specify which flags are being | |
1283 | * changed. | |
1284 | */ | |
1285 | return -EINVAL; | |
1286 | } | |
1287 | ||
1288 | flags = ntohl(nla_get_be32(nfqa[NFQA_CFG_FLAGS])); | |
1289 | mask = ntohl(nla_get_be32(nfqa[NFQA_CFG_MASK])); | |
1290 | ||
1291 | if (flags >= NFQA_CFG_F_MAX) | |
1292 | return -EOPNOTSUPP; | |
1293 | ||
1294 | #if !IS_ENABLED(CONFIG_NETWORK_SECMARK) | |
1295 | if (flags & mask & NFQA_CFG_F_SECCTX) | |
1296 | return -EOPNOTSUPP; | |
1297 | #endif | |
71b2e5f5 KM |
1298 | if ((flags & mask & NFQA_CFG_F_CONNTRACK) && |
1299 | !rcu_access_pointer(nfnl_ct_hook)) { | |
1300 | #ifdef CONFIG_MODULES | |
1301 | nfnl_unlock(NFNL_SUBSYS_QUEUE); | |
1302 | request_module("ip_conntrack_netlink"); | |
1303 | nfnl_lock(NFNL_SUBSYS_QUEUE); | |
1304 | if (rcu_access_pointer(nfnl_ct_hook)) | |
1305 | return -EAGAIN; | |
1306 | #endif | |
1307 | return -EOPNOTSUPP; | |
1308 | } | |
60d2c7f9 KM |
1309 | } |
1310 | ||
9872bec7 | 1311 | rcu_read_lock(); |
e8179610 | 1312 | queue = instance_lookup(q, queue_num); |
15e47304 | 1313 | if (queue && queue->peer_portid != NETLINK_CB(skb).portid) { |
a3c8e7fd | 1314 | ret = -EPERM; |
9872bec7 | 1315 | goto err_out_unlock; |
a3c8e7fd PM |
1316 | } |
1317 | ||
9872bec7 | 1318 | if (cmd != NULL) { |
7af4cc3f HW |
1319 | switch (cmd->command) { |
1320 | case NFQNL_CFG_CMD_BIND: | |
9872bec7 PM |
1321 | if (queue) { |
1322 | ret = -EBUSY; | |
1323 | goto err_out_unlock; | |
1324 | } | |
e8179610 G |
1325 | queue = instance_create(q, queue_num, |
1326 | NETLINK_CB(skb).portid); | |
baab2ce7 PM |
1327 | if (IS_ERR(queue)) { |
1328 | ret = PTR_ERR(queue); | |
9872bec7 PM |
1329 | goto err_out_unlock; |
1330 | } | |
7af4cc3f HW |
1331 | break; |
1332 | case NFQNL_CFG_CMD_UNBIND: | |
9872bec7 PM |
1333 | if (!queue) { |
1334 | ret = -ENODEV; | |
1335 | goto err_out_unlock; | |
1336 | } | |
e8179610 | 1337 | instance_destroy(q, queue); |
17bc6b48 | 1338 | goto err_out_unlock; |
7af4cc3f | 1339 | case NFQNL_CFG_CMD_PF_BIND: |
7af4cc3f | 1340 | case NFQNL_CFG_CMD_PF_UNBIND: |
7af4cc3f HW |
1341 | break; |
1342 | default: | |
cd21f0ac | 1343 | ret = -ENOTSUPP; |
21c3c971 | 1344 | goto err_out_unlock; |
7af4cc3f | 1345 | } |
7af4cc3f HW |
1346 | } |
1347 | ||
60d2c7f9 KM |
1348 | if (!queue) { |
1349 | ret = -ENODEV; | |
1350 | goto err_out_unlock; | |
1351 | } | |
1352 | ||
df6fb868 | 1353 | if (nfqa[NFQA_CFG_PARAMS]) { |
60d2c7f9 KM |
1354 | struct nfqnl_msg_config_params *params = |
1355 | nla_data(nfqa[NFQA_CFG_PARAMS]); | |
7af4cc3f HW |
1356 | |
1357 | nfqnl_set_mode(queue, params->copy_mode, | |
1358 | ntohl(params->copy_range)); | |
1359 | } | |
1360 | ||
df6fb868 | 1361 | if (nfqa[NFQA_CFG_QUEUE_MAXLEN]) { |
60d2c7f9 | 1362 | __be32 *queue_maxlen = nla_data(nfqa[NFQA_CFG_QUEUE_MAXLEN]); |
a3c8e7fd | 1363 | |
829e17a1 EL |
1364 | spin_lock_bh(&queue->lock); |
1365 | queue->queue_maxlen = ntohl(*queue_maxlen); | |
1366 | spin_unlock_bh(&queue->lock); | |
1367 | } | |
1368 | ||
fdb694a0 | 1369 | if (nfqa[NFQA_CFG_FLAGS]) { |
fdb694a0 KK |
1370 | spin_lock_bh(&queue->lock); |
1371 | queue->flags &= ~mask; | |
1372 | queue->flags |= flags & mask; | |
1373 | spin_unlock_bh(&queue->lock); | |
1374 | } | |
1375 | ||
9872bec7 PM |
1376 | err_out_unlock: |
1377 | rcu_read_unlock(); | |
838ab636 | 1378 | return ret; |
7af4cc3f HW |
1379 | } |
1380 | ||
7c8d4cb4 | 1381 | static const struct nfnl_callback nfqnl_cb[NFQNL_MSG_MAX] = { |
50f2db9e PNA |
1382 | [NFQNL_MSG_PACKET] = { |
1383 | .call = nfqnl_recv_unsupp, | |
1384 | .type = NFNL_CB_RCU, | |
1385 | .attr_count = NFQA_MAX, | |
1386 | }, | |
1387 | [NFQNL_MSG_VERDICT] = { | |
1388 | .call = nfqnl_recv_verdict, | |
1389 | .type = NFNL_CB_RCU, | |
1390 | .attr_count = NFQA_MAX, | |
1391 | .policy = nfqa_verdict_policy | |
1392 | }, | |
1393 | [NFQNL_MSG_CONFIG] = { | |
1394 | .call = nfqnl_recv_config, | |
1395 | .type = NFNL_CB_MUTEX, | |
1396 | .attr_count = NFQA_CFG_MAX, | |
1397 | .policy = nfqa_cfg_policy | |
1398 | }, | |
1399 | [NFQNL_MSG_VERDICT_BATCH] = { | |
1400 | .call = nfqnl_recv_verdict_batch, | |
1401 | .type = NFNL_CB_RCU, | |
1402 | .attr_count = NFQA_MAX, | |
1403 | .policy = nfqa_verdict_batch_policy | |
1404 | }, | |
7af4cc3f HW |
1405 | }; |
1406 | ||
7c8d4cb4 | 1407 | static const struct nfnetlink_subsystem nfqnl_subsys = { |
7af4cc3f HW |
1408 | .name = "nf_queue", |
1409 | .subsys_id = NFNL_SUBSYS_QUEUE, | |
1410 | .cb_count = NFQNL_MSG_MAX, | |
7af4cc3f HW |
1411 | .cb = nfqnl_cb, |
1412 | }; | |
1413 | ||
838ab636 HW |
1414 | #ifdef CONFIG_PROC_FS |
1415 | struct iter_state { | |
e8179610 | 1416 | struct seq_net_private p; |
838ab636 HW |
1417 | unsigned int bucket; |
1418 | }; | |
1419 | ||
1420 | static struct hlist_node *get_first(struct seq_file *seq) | |
1421 | { | |
1422 | struct iter_state *st = seq->private; | |
e8179610 G |
1423 | struct net *net; |
1424 | struct nfnl_queue_net *q; | |
838ab636 HW |
1425 | |
1426 | if (!st) | |
1427 | return NULL; | |
1428 | ||
e8179610 G |
1429 | net = seq_file_net(seq); |
1430 | q = nfnl_queue_pernet(net); | |
838ab636 | 1431 | for (st->bucket = 0; st->bucket < INSTANCE_BUCKETS; st->bucket++) { |
e8179610 G |
1432 | if (!hlist_empty(&q->instance_table[st->bucket])) |
1433 | return q->instance_table[st->bucket].first; | |
838ab636 HW |
1434 | } |
1435 | return NULL; | |
1436 | } | |
1437 | ||
1438 | static struct hlist_node *get_next(struct seq_file *seq, struct hlist_node *h) | |
1439 | { | |
1440 | struct iter_state *st = seq->private; | |
e8179610 | 1441 | struct net *net = seq_file_net(seq); |
838ab636 HW |
1442 | |
1443 | h = h->next; | |
1444 | while (!h) { | |
e8179610 G |
1445 | struct nfnl_queue_net *q; |
1446 | ||
838ab636 HW |
1447 | if (++st->bucket >= INSTANCE_BUCKETS) |
1448 | return NULL; | |
1449 | ||
e8179610 G |
1450 | q = nfnl_queue_pernet(net); |
1451 | h = q->instance_table[st->bucket].first; | |
838ab636 HW |
1452 | } |
1453 | return h; | |
1454 | } | |
1455 | ||
1456 | static struct hlist_node *get_idx(struct seq_file *seq, loff_t pos) | |
1457 | { | |
1458 | struct hlist_node *head; | |
1459 | head = get_first(seq); | |
1460 | ||
1461 | if (head) | |
1462 | while (pos && (head = get_next(seq, head))) | |
1463 | pos--; | |
1464 | return pos ? NULL : head; | |
1465 | } | |
1466 | ||
e8179610 G |
1467 | static void *seq_start(struct seq_file *s, loff_t *pos) |
1468 | __acquires(nfnl_queue_pernet(seq_file_net(s))->instances_lock) | |
838ab636 | 1469 | { |
e8179610 G |
1470 | spin_lock(&nfnl_queue_pernet(seq_file_net(s))->instances_lock); |
1471 | return get_idx(s, *pos); | |
838ab636 HW |
1472 | } |
1473 | ||
1474 | static void *seq_next(struct seq_file *s, void *v, loff_t *pos) | |
1475 | { | |
1476 | (*pos)++; | |
1477 | return get_next(s, v); | |
1478 | } | |
1479 | ||
1480 | static void seq_stop(struct seq_file *s, void *v) | |
e8179610 | 1481 | __releases(nfnl_queue_pernet(seq_file_net(s))->instances_lock) |
838ab636 | 1482 | { |
e8179610 | 1483 | spin_unlock(&nfnl_queue_pernet(seq_file_net(s))->instances_lock); |
838ab636 HW |
1484 | } |
1485 | ||
1486 | static int seq_show(struct seq_file *s, void *v) | |
1487 | { | |
1488 | const struct nfqnl_instance *inst = v; | |
1489 | ||
6b46f7b7 | 1490 | seq_printf(s, "%5u %6u %5u %1u %5u %5u %5u %8u %2d\n", |
e71456ae SRRH |
1491 | inst->queue_num, |
1492 | inst->peer_portid, inst->queue_total, | |
1493 | inst->copy_mode, inst->copy_range, | |
1494 | inst->queue_dropped, inst->queue_user_dropped, | |
1495 | inst->id_sequence, 1); | |
861fb107 | 1496 | return 0; |
838ab636 HW |
1497 | } |
1498 | ||
56b3d975 | 1499 | static const struct seq_operations nfqnl_seq_ops = { |
838ab636 HW |
1500 | .start = seq_start, |
1501 | .next = seq_next, | |
1502 | .stop = seq_stop, | |
1503 | .show = seq_show, | |
1504 | }; | |
838ab636 HW |
1505 | #endif /* PROC_FS */ |
1506 | ||
e8179610 | 1507 | static int __net_init nfnl_queue_net_init(struct net *net) |
7af4cc3f | 1508 | { |
e8179610 G |
1509 | unsigned int i; |
1510 | struct nfnl_queue_net *q = nfnl_queue_pernet(net); | |
601e68e1 | 1511 | |
838ab636 | 1512 | for (i = 0; i < INSTANCE_BUCKETS; i++) |
e8179610 G |
1513 | INIT_HLIST_HEAD(&q->instance_table[i]); |
1514 | ||
1515 | spin_lock_init(&q->instances_lock); | |
1516 | ||
1517 | #ifdef CONFIG_PROC_FS | |
c3506372 CH |
1518 | if (!proc_create_net("nfnetlink_queue", 0440, net->nf.proc_netfilter, |
1519 | &nfqnl_seq_ops, sizeof(struct iter_state))) | |
e8179610 G |
1520 | return -ENOMEM; |
1521 | #endif | |
1522 | return 0; | |
1523 | } | |
1524 | ||
1525 | static void __net_exit nfnl_queue_net_exit(struct net *net) | |
1526 | { | |
613d0776 VA |
1527 | struct nfnl_queue_net *q = nfnl_queue_pernet(net); |
1528 | unsigned int i; | |
1529 | ||
e778f56e | 1530 | #ifdef CONFIG_PROC_FS |
e8179610 | 1531 | remove_proc_entry("nfnetlink_queue", net->nf.proc_netfilter); |
e778f56e | 1532 | #endif |
613d0776 VA |
1533 | for (i = 0; i < INSTANCE_BUCKETS; i++) |
1534 | WARN_ON_ONCE(!hlist_empty(&q->instance_table[i])); | |
e8179610 G |
1535 | } |
1536 | ||
dc3ee32e EB |
1537 | static void nfnl_queue_net_exit_batch(struct list_head *net_exit_list) |
1538 | { | |
1539 | synchronize_rcu(); | |
1540 | } | |
1541 | ||
e8179610 | 1542 | static struct pernet_operations nfnl_queue_net_ops = { |
dc3ee32e EB |
1543 | .init = nfnl_queue_net_init, |
1544 | .exit = nfnl_queue_net_exit, | |
1545 | .exit_batch = nfnl_queue_net_exit_batch, | |
1546 | .id = &nfnl_queue_net_id, | |
1547 | .size = sizeof(struct nfnl_queue_net), | |
e8179610 G |
1548 | }; |
1549 | ||
1550 | static int __init nfnetlink_queue_init(void) | |
1551 | { | |
3bfe0498 FR |
1552 | int status; |
1553 | ||
1554 | status = register_pernet_subsys(&nfnl_queue_net_ops); | |
1555 | if (status < 0) { | |
5191d70f | 1556 | pr_err("failed to register pernet ops\n"); |
3bfe0498 FR |
1557 | goto out; |
1558 | } | |
838ab636 | 1559 | |
7af4cc3f HW |
1560 | netlink_register_notifier(&nfqnl_rtnl_notifier); |
1561 | status = nfnetlink_subsys_register(&nfqnl_subsys); | |
1562 | if (status < 0) { | |
5191d70f | 1563 | pr_err("failed to create netlink socket\n"); |
7af4cc3f HW |
1564 | goto cleanup_netlink_notifier; |
1565 | } | |
1566 | ||
4e6577de GF |
1567 | status = register_netdevice_notifier(&nfqnl_dev_notifier); |
1568 | if (status < 0) { | |
5191d70f | 1569 | pr_err("failed to register netdevice notifier\n"); |
4e6577de GF |
1570 | goto cleanup_netlink_subsys; |
1571 | } | |
1572 | ||
87029970 FW |
1573 | nf_register_queue_handler(&nfqh); |
1574 | ||
7af4cc3f HW |
1575 | return status; |
1576 | ||
4e6577de GF |
1577 | cleanup_netlink_subsys: |
1578 | nfnetlink_subsys_unregister(&nfqnl_subsys); | |
7af4cc3f HW |
1579 | cleanup_netlink_notifier: |
1580 | netlink_unregister_notifier(&nfqnl_rtnl_notifier); | |
639e077b | 1581 | unregister_pernet_subsys(&nfnl_queue_net_ops); |
3bfe0498 | 1582 | out: |
7af4cc3f HW |
1583 | return status; |
1584 | } | |
1585 | ||
65b4b4e8 | 1586 | static void __exit nfnetlink_queue_fini(void) |
7af4cc3f | 1587 | { |
87029970 | 1588 | nf_unregister_queue_handler(); |
32292a7f | 1589 | unregister_netdevice_notifier(&nfqnl_dev_notifier); |
32292a7f PM |
1590 | nfnetlink_subsys_unregister(&nfqnl_subsys); |
1591 | netlink_unregister_notifier(&nfqnl_rtnl_notifier); | |
3bfe0498 | 1592 | unregister_pernet_subsys(&nfnl_queue_net_ops); |
67137f3c JDB |
1593 | |
1594 | rcu_barrier(); /* Wait for completion of call_rcu()'s */ | |
7af4cc3f HW |
1595 | } |
1596 | ||
1597 | MODULE_DESCRIPTION("netfilter packet queue handler"); | |
1598 | MODULE_AUTHOR("Harald Welte <laforge@netfilter.org>"); | |
1599 | MODULE_LICENSE("GPL"); | |
1600 | MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_QUEUE); | |
1601 | ||
65b4b4e8 AM |
1602 | module_init(nfnetlink_queue_init); |
1603 | module_exit(nfnetlink_queue_fini); |