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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 | ||
4ecd5474 MT |
231 | rcu_read_lock(); |
232 | ||
368982cd | 233 | if (verdict == NF_ACCEPT || |
ad18d7bf | 234 | verdict == NF_REPEAT || |
368982cd | 235 | verdict == NF_STOP) { |
368982cd PNA |
236 | ct_hook = rcu_dereference(nf_ct_hook); |
237 | if (ct_hook) { | |
238 | err = ct_hook->update(entry->state.net, entry->skb); | |
239 | if (err < 0) | |
240 | verdict = NF_DROP; | |
241 | } | |
368982cd PNA |
242 | } |
243 | nf_reinject(entry, verdict); | |
4ecd5474 | 244 | rcu_read_unlock(); |
368982cd PNA |
245 | } |
246 | ||
7af4cc3f | 247 | static void |
b43d8d85 | 248 | nfqnl_flush(struct nfqnl_instance *queue, nfqnl_cmpfn cmpfn, unsigned long data) |
7af4cc3f | 249 | { |
02f014d8 | 250 | struct nf_queue_entry *entry, *next; |
b43d8d85 | 251 | |
7af4cc3f | 252 | spin_lock_bh(&queue->lock); |
b43d8d85 PM |
253 | list_for_each_entry_safe(entry, next, &queue->queue_list, list) { |
254 | if (!cmpfn || cmpfn(entry, data)) { | |
255 | list_del(&entry->list); | |
256 | queue->queue_total--; | |
368982cd | 257 | nfqnl_reinject(entry, NF_DROP); |
b43d8d85 PM |
258 | } |
259 | } | |
7af4cc3f HW |
260 | spin_unlock_bh(&queue->lock); |
261 | } | |
262 | ||
496e4ae7 FW |
263 | static int |
264 | nfqnl_put_packet_info(struct sk_buff *nlskb, struct sk_buff *packet, | |
265 | bool csum_verify) | |
7237190d FW |
266 | { |
267 | __u32 flags = 0; | |
268 | ||
269 | if (packet->ip_summed == CHECKSUM_PARTIAL) | |
270 | flags = NFQA_SKB_CSUMNOTREADY; | |
496e4ae7 FW |
271 | else if (csum_verify) |
272 | flags = NFQA_SKB_CSUM_NOTVERIFIED; | |
273 | ||
7237190d FW |
274 | if (skb_is_gso(packet)) |
275 | flags |= NFQA_SKB_GSO; | |
276 | ||
277 | return flags ? nla_put_be32(nlskb, NFQA_SKB_INFO, htonl(flags)) : 0; | |
278 | } | |
279 | ||
08c0cad6 VG |
280 | static int nfqnl_put_sk_uidgid(struct sk_buff *skb, struct sock *sk) |
281 | { | |
282 | const struct cred *cred; | |
283 | ||
a8399231 | 284 | if (!sk_fullsock(sk)) |
08c0cad6 VG |
285 | return 0; |
286 | ||
287 | read_lock_bh(&sk->sk_callback_lock); | |
288 | if (sk->sk_socket && sk->sk_socket->file) { | |
289 | cred = sk->sk_socket->file->f_cred; | |
290 | if (nla_put_be32(skb, NFQA_UID, | |
291 | htonl(from_kuid_munged(&init_user_ns, cred->fsuid)))) | |
292 | goto nla_put_failure; | |
293 | if (nla_put_be32(skb, NFQA_GID, | |
294 | htonl(from_kgid_munged(&init_user_ns, cred->fsgid)))) | |
295 | goto nla_put_failure; | |
296 | } | |
297 | read_unlock_bh(&sk->sk_callback_lock); | |
298 | return 0; | |
299 | ||
300 | nla_put_failure: | |
301 | read_unlock_bh(&sk->sk_callback_lock); | |
302 | return -1; | |
303 | } | |
304 | ||
ef493bd9 RK |
305 | static u32 nfqnl_get_sk_secctx(struct sk_buff *skb, char **secdata) |
306 | { | |
307 | u32 seclen = 0; | |
308 | #if IS_ENABLED(CONFIG_NETWORK_SECMARK) | |
309 | if (!skb || !sk_fullsock(skb->sk)) | |
310 | return 0; | |
311 | ||
312 | read_lock_bh(&skb->sk->sk_callback_lock); | |
313 | ||
314 | if (skb->secmark) | |
315 | security_secid_to_secctx(skb->secmark, secdata, &seclen); | |
316 | ||
317 | read_unlock_bh(&skb->sk->sk_callback_lock); | |
318 | #endif | |
319 | return seclen; | |
320 | } | |
321 | ||
15824ab2 SB |
322 | static u32 nfqnl_get_bridge_size(struct nf_queue_entry *entry) |
323 | { | |
324 | struct sk_buff *entskb = entry->skb; | |
325 | u32 nlalen = 0; | |
326 | ||
327 | if (entry->state.pf != PF_BRIDGE || !skb_mac_header_was_set(entskb)) | |
328 | return 0; | |
329 | ||
330 | if (skb_vlan_tag_present(entskb)) | |
331 | nlalen += nla_total_size(nla_total_size(sizeof(__be16)) + | |
332 | nla_total_size(sizeof(__be16))); | |
333 | ||
334 | if (entskb->network_header > entskb->mac_header) | |
335 | nlalen += nla_total_size((entskb->network_header - | |
336 | entskb->mac_header)); | |
337 | ||
338 | return nlalen; | |
339 | } | |
340 | ||
341 | static int nfqnl_put_bridge(struct nf_queue_entry *entry, struct sk_buff *skb) | |
342 | { | |
343 | struct sk_buff *entskb = entry->skb; | |
344 | ||
345 | if (entry->state.pf != PF_BRIDGE || !skb_mac_header_was_set(entskb)) | |
346 | return 0; | |
347 | ||
348 | if (skb_vlan_tag_present(entskb)) { | |
349 | struct nlattr *nest; | |
350 | ||
ae0be8de | 351 | nest = nla_nest_start(skb, NFQA_VLAN); |
15824ab2 SB |
352 | if (!nest) |
353 | goto nla_put_failure; | |
354 | ||
355 | if (nla_put_be16(skb, NFQA_VLAN_TCI, htons(entskb->vlan_tci)) || | |
356 | nla_put_be16(skb, NFQA_VLAN_PROTO, entskb->vlan_proto)) | |
357 | goto nla_put_failure; | |
358 | ||
359 | nla_nest_end(skb, nest); | |
360 | } | |
361 | ||
362 | if (entskb->mac_header < entskb->network_header) { | |
363 | int len = (int)(entskb->network_header - entskb->mac_header); | |
364 | ||
365 | if (nla_put(skb, NFQA_L2HDR, len, skb_mac_header(entskb))) | |
366 | goto nla_put_failure; | |
367 | } | |
368 | ||
369 | return 0; | |
370 | ||
371 | nla_put_failure: | |
372 | return -1; | |
373 | } | |
374 | ||
7af4cc3f | 375 | static struct sk_buff * |
74332687 | 376 | nfqnl_build_packet_message(struct net *net, struct nfqnl_instance *queue, |
5863702a ED |
377 | struct nf_queue_entry *entry, |
378 | __be32 **packet_id_ptr) | |
7af4cc3f | 379 | { |
7af4cc3f | 380 | size_t size; |
c5b0db32 | 381 | size_t data_len = 0, cap_len = 0; |
af2806f8 | 382 | unsigned int hlen = 0; |
7af4cc3f | 383 | struct sk_buff *skb; |
5863702a ED |
384 | struct nlattr *nla; |
385 | struct nfqnl_msg_packet_hdr *pmsg; | |
7af4cc3f | 386 | struct nlmsghdr *nlh; |
3e4ead4f JJ |
387 | struct sk_buff *entskb = entry->skb; |
388 | struct net_device *indev; | |
389 | struct net_device *outdev; | |
9cb01766 | 390 | struct nf_conn *ct = NULL; |
3f649ab7 | 391 | enum ip_conntrack_info ctinfo; |
a4b4766c | 392 | struct nfnl_ct_hook *nfnl_ct; |
496e4ae7 | 393 | bool csum_verify; |
ef493bd9 RK |
394 | char *secdata = NULL; |
395 | u32 seclen = 0; | |
7af4cc3f | 396 | |
7e59b3fe | 397 | size = nlmsg_total_size(sizeof(struct nfgenmsg)) |
df6fb868 PM |
398 | + nla_total_size(sizeof(struct nfqnl_msg_packet_hdr)) |
399 | + nla_total_size(sizeof(u_int32_t)) /* ifindex */ | |
400 | + nla_total_size(sizeof(u_int32_t)) /* ifindex */ | |
1109a90c | 401 | #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER) |
df6fb868 PM |
402 | + nla_total_size(sizeof(u_int32_t)) /* ifindex */ |
403 | + nla_total_size(sizeof(u_int32_t)) /* ifindex */ | |
fbcd923c | 404 | #endif |
df6fb868 PM |
405 | + nla_total_size(sizeof(u_int32_t)) /* mark */ |
406 | + nla_total_size(sizeof(struct nfqnl_msg_packet_hw)) | |
7237190d | 407 | + nla_total_size(sizeof(u_int32_t)) /* skbinfo */ |
ae08ce00 ED |
408 | + nla_total_size(sizeof(u_int32_t)); /* cap_len */ |
409 | ||
2456e855 | 410 | if (entskb->tstamp) |
ae08ce00 | 411 | size += nla_total_size(sizeof(struct nfqnl_msg_packet_timestamp)); |
7af4cc3f | 412 | |
15824ab2 SB |
413 | size += nfqnl_get_bridge_size(entry); |
414 | ||
1d1de89b DM |
415 | if (entry->state.hook <= NF_INET_FORWARD || |
416 | (entry->state.hook == NF_INET_POST_ROUTING && entskb->sk == NULL)) | |
496e4ae7 FW |
417 | csum_verify = !skb_csum_unnecessary(entskb); |
418 | else | |
419 | csum_verify = false; | |
420 | ||
1d1de89b | 421 | outdev = entry->state.out; |
3e4ead4f | 422 | |
14cd5d4a | 423 | switch ((enum nfqnl_config_mode)READ_ONCE(queue->copy_mode)) { |
7af4cc3f HW |
424 | case NFQNL_COPY_META: |
425 | case NFQNL_COPY_NONE: | |
7af4cc3f | 426 | break; |
601e68e1 | 427 | |
7af4cc3f | 428 | case NFQNL_COPY_PACKET: |
00bd1cc2 FW |
429 | if (!(queue->flags & NFQA_CFG_F_GSO) && |
430 | entskb->ip_summed == CHECKSUM_PARTIAL && | |
c463ac97 | 431 | skb_checksum_help(entskb)) |
e7dfb09a | 432 | return NULL; |
c463ac97 | 433 | |
14cd5d4a | 434 | data_len = READ_ONCE(queue->copy_range); |
9cefbbc9 | 435 | if (data_len > entskb->len) |
3e4ead4f | 436 | data_len = entskb->len; |
601e68e1 | 437 | |
af2806f8 TG |
438 | hlen = skb_zerocopy_headlen(entskb); |
439 | hlen = min_t(unsigned int, hlen, data_len); | |
ae08ce00 | 440 | size += sizeof(struct nlattr) + hlen; |
6ee584be | 441 | cap_len = entskb->len; |
7af4cc3f | 442 | break; |
7af4cc3f HW |
443 | } |
444 | ||
8e662164 AB |
445 | nfnl_ct = rcu_dereference(nfnl_ct_hook); |
446 | ||
83ace77f | 447 | #if IS_ENABLED(CONFIG_NF_CONNTRACK) |
b7bd1809 | 448 | if (queue->flags & NFQA_CFG_F_CONNTRACK) { |
a4b4766c | 449 | if (nfnl_ct != NULL) { |
83ace77f | 450 | ct = nf_ct_get(entskb, &ctinfo); |
b7bd1809 | 451 | if (ct != NULL) |
a4b4766c | 452 | size += nfnl_ct->build_size(ct); |
b7bd1809 PNA |
453 | } |
454 | } | |
83ace77f | 455 | #endif |
7af4cc3f | 456 | |
08c0cad6 | 457 | if (queue->flags & NFQA_CFG_F_UID_GID) { |
7e59b3fe | 458 | size += (nla_total_size(sizeof(u_int32_t)) /* uid */ |
08c0cad6 VG |
459 | + nla_total_size(sizeof(u_int32_t))); /* gid */ |
460 | } | |
461 | ||
ef493bd9 RK |
462 | if ((queue->flags & NFQA_CFG_F_SECCTX) && entskb->sk) { |
463 | seclen = nfqnl_get_sk_secctx(entskb, &secdata); | |
464 | if (seclen) | |
465 | size += nla_total_size(seclen); | |
466 | } | |
467 | ||
c5b0db32 | 468 | skb = alloc_skb(size, GFP_ATOMIC); |
36d5fe6a ZK |
469 | if (!skb) { |
470 | skb_tx_error(entskb); | |
77c1c03c | 471 | goto nlmsg_failure; |
36d5fe6a | 472 | } |
601e68e1 | 473 | |
19c28b13 PNA |
474 | nlh = nfnl_msg_put(skb, 0, 0, |
475 | nfnl_msg_type(NFNL_SUBSYS_QUEUE, NFQNL_MSG_PACKET), | |
476 | 0, entry->state.pf, NFNETLINK_V0, | |
477 | htons(queue->queue_num)); | |
3da07c0c | 478 | if (!nlh) { |
36d5fe6a | 479 | skb_tx_error(entskb); |
3da07c0c | 480 | kfree_skb(skb); |
77c1c03c | 481 | goto nlmsg_failure; |
3da07c0c | 482 | } |
7af4cc3f | 483 | |
5863702a ED |
484 | nla = __nla_reserve(skb, NFQA_PACKET_HDR, sizeof(*pmsg)); |
485 | pmsg = nla_data(nla); | |
486 | pmsg->hw_protocol = entskb->protocol; | |
1d1de89b | 487 | pmsg->hook = entry->state.hook; |
5863702a | 488 | *packet_id_ptr = &pmsg->packet_id; |
7af4cc3f | 489 | |
1d1de89b | 490 | indev = entry->state.in; |
3e4ead4f | 491 | if (indev) { |
1109a90c | 492 | #if !IS_ENABLED(CONFIG_BRIDGE_NETFILTER) |
a447189e DM |
493 | if (nla_put_be32(skb, NFQA_IFINDEX_INDEV, htonl(indev->ifindex))) |
494 | goto nla_put_failure; | |
fbcd923c | 495 | #else |
1d1de89b | 496 | if (entry->state.pf == PF_BRIDGE) { |
fbcd923c | 497 | /* Case 1: indev is physical input device, we need to |
601e68e1 | 498 | * look for bridge group (when called from |
fbcd923c | 499 | * netfilter_bridge) */ |
a447189e DM |
500 | if (nla_put_be32(skb, NFQA_IFINDEX_PHYSINDEV, |
501 | htonl(indev->ifindex)) || | |
fbcd923c | 502 | /* this is the bridge group "brX" */ |
f350a0a8 | 503 | /* rcu_read_lock()ed by __nf_queue */ |
a447189e DM |
504 | nla_put_be32(skb, NFQA_IFINDEX_INDEV, |
505 | htonl(br_port_get_rcu(indev)->br->dev->ifindex))) | |
506 | goto nla_put_failure; | |
fbcd923c | 507 | } else { |
c737b7c4 FW |
508 | int physinif; |
509 | ||
fbcd923c HW |
510 | /* Case 2: indev is bridge group, we need to look for |
511 | * physical device (when called from ipv4) */ | |
a447189e DM |
512 | if (nla_put_be32(skb, NFQA_IFINDEX_INDEV, |
513 | htonl(indev->ifindex))) | |
514 | goto nla_put_failure; | |
c737b7c4 FW |
515 | |
516 | physinif = nf_bridge_get_physinif(entskb); | |
517 | if (physinif && | |
a447189e | 518 | nla_put_be32(skb, NFQA_IFINDEX_PHYSINDEV, |
c737b7c4 | 519 | htonl(physinif))) |
a447189e | 520 | goto nla_put_failure; |
fbcd923c HW |
521 | } |
522 | #endif | |
7af4cc3f HW |
523 | } |
524 | ||
3e4ead4f | 525 | if (outdev) { |
1109a90c | 526 | #if !IS_ENABLED(CONFIG_BRIDGE_NETFILTER) |
a447189e DM |
527 | if (nla_put_be32(skb, NFQA_IFINDEX_OUTDEV, htonl(outdev->ifindex))) |
528 | goto nla_put_failure; | |
fbcd923c | 529 | #else |
1d1de89b | 530 | if (entry->state.pf == PF_BRIDGE) { |
fbcd923c | 531 | /* Case 1: outdev is physical output device, we need to |
601e68e1 | 532 | * look for bridge group (when called from |
fbcd923c | 533 | * netfilter_bridge) */ |
a447189e DM |
534 | if (nla_put_be32(skb, NFQA_IFINDEX_PHYSOUTDEV, |
535 | htonl(outdev->ifindex)) || | |
fbcd923c | 536 | /* this is the bridge group "brX" */ |
f350a0a8 | 537 | /* rcu_read_lock()ed by __nf_queue */ |
a447189e DM |
538 | nla_put_be32(skb, NFQA_IFINDEX_OUTDEV, |
539 | htonl(br_port_get_rcu(outdev)->br->dev->ifindex))) | |
540 | goto nla_put_failure; | |
fbcd923c | 541 | } else { |
c737b7c4 FW |
542 | int physoutif; |
543 | ||
fbcd923c HW |
544 | /* Case 2: outdev is bridge group, we need to look for |
545 | * physical output device (when called from ipv4) */ | |
a447189e DM |
546 | if (nla_put_be32(skb, NFQA_IFINDEX_OUTDEV, |
547 | htonl(outdev->ifindex))) | |
548 | goto nla_put_failure; | |
c737b7c4 FW |
549 | |
550 | physoutif = nf_bridge_get_physoutif(entskb); | |
551 | if (physoutif && | |
a447189e | 552 | nla_put_be32(skb, NFQA_IFINDEX_PHYSOUTDEV, |
c737b7c4 | 553 | htonl(physoutif))) |
a447189e | 554 | goto nla_put_failure; |
fbcd923c HW |
555 | } |
556 | #endif | |
7af4cc3f HW |
557 | } |
558 | ||
a447189e DM |
559 | if (entskb->mark && |
560 | nla_put_be32(skb, NFQA_MARK, htonl(entskb->mark))) | |
561 | goto nla_put_failure; | |
7af4cc3f | 562 | |
2c38de4c | 563 | if (indev && entskb->dev && |
406b7337 IG |
564 | skb_mac_header_was_set(entskb) && |
565 | skb_mac_header_len(entskb) != 0) { | |
7af4cc3f | 566 | struct nfqnl_msg_packet_hw phw; |
e4d091d7 DC |
567 | int len; |
568 | ||
569 | memset(&phw, 0, sizeof(phw)); | |
570 | len = dev_parse_header(entskb, phw.hw_addr); | |
b95cce35 SH |
571 | if (len) { |
572 | phw.hw_addrlen = htons(len); | |
a447189e DM |
573 | if (nla_put(skb, NFQA_HWADDR, sizeof(phw), &phw)) |
574 | goto nla_put_failure; | |
b95cce35 | 575 | } |
7af4cc3f HW |
576 | } |
577 | ||
15824ab2 SB |
578 | if (nfqnl_put_bridge(entry, skb) < 0) |
579 | goto nla_put_failure; | |
580 | ||
916f6efa | 581 | if (entry->state.hook <= NF_INET_FORWARD && entskb->tstamp) { |
7af4cc3f | 582 | struct nfqnl_msg_packet_timestamp ts; |
a7f18845 | 583 | struct timespec64 kts = ktime_to_timespec64(entskb->tstamp); |
b28b1e82 PNA |
584 | |
585 | ts.sec = cpu_to_be64(kts.tv_sec); | |
586 | ts.usec = cpu_to_be64(kts.tv_nsec / NSEC_PER_USEC); | |
7af4cc3f | 587 | |
a447189e DM |
588 | if (nla_put(skb, NFQA_TIMESTAMP, sizeof(ts), &ts)) |
589 | goto nla_put_failure; | |
7af4cc3f HW |
590 | } |
591 | ||
08c0cad6 VG |
592 | if ((queue->flags & NFQA_CFG_F_UID_GID) && entskb->sk && |
593 | nfqnl_put_sk_uidgid(skb, entskb->sk) < 0) | |
594 | goto nla_put_failure; | |
595 | ||
ef493bd9 RK |
596 | if (seclen && nla_put(skb, NFQA_SECCTX, seclen, secdata)) |
597 | goto nla_put_failure; | |
598 | ||
a4b4766c | 599 | if (ct && nfnl_ct->build(skb, ct, ctinfo, NFQA_CT, NFQA_CT_INFO) < 0) |
ae08ce00 ED |
600 | goto nla_put_failure; |
601 | ||
7f87712c FW |
602 | if (cap_len > data_len && |
603 | nla_put_be32(skb, NFQA_CAP_LEN, htonl(cap_len))) | |
ae08ce00 ED |
604 | goto nla_put_failure; |
605 | ||
496e4ae7 | 606 | if (nfqnl_put_packet_info(skb, entskb, csum_verify)) |
7237190d FW |
607 | goto nla_put_failure; |
608 | ||
7af4cc3f | 609 | if (data_len) { |
df6fb868 | 610 | struct nlattr *nla; |
7af4cc3f | 611 | |
ae08ce00 ED |
612 | if (skb_tailroom(skb) < sizeof(*nla) + hlen) |
613 | goto nla_put_failure; | |
7af4cc3f | 614 | |
4df864c1 | 615 | nla = skb_put(skb, sizeof(*nla)); |
df6fb868 | 616 | nla->nla_type = NFQA_PAYLOAD; |
ae08ce00 | 617 | nla->nla_len = nla_attr_size(data_len); |
7af4cc3f | 618 | |
36d5fe6a ZK |
619 | if (skb_zerocopy(skb, entskb, data_len, hlen)) |
620 | goto nla_put_failure; | |
7af4cc3f | 621 | } |
601e68e1 | 622 | |
ae08ce00 | 623 | nlh->nlmsg_len = skb->len; |
77c1c03c LZ |
624 | if (seclen) |
625 | security_release_secctx(secdata, seclen); | |
7af4cc3f HW |
626 | return skb; |
627 | ||
df6fb868 | 628 | nla_put_failure: |
36d5fe6a | 629 | skb_tx_error(entskb); |
a6729955 | 630 | kfree_skb(skb); |
e87cc472 | 631 | net_err_ratelimited("nf_queue: error creating packet message\n"); |
77c1c03c LZ |
632 | nlmsg_failure: |
633 | if (seclen) | |
634 | security_release_secctx(secdata, seclen); | |
7af4cc3f HW |
635 | return NULL; |
636 | } | |
637 | ||
5da773a3 FW |
638 | static bool nf_ct_drop_unconfirmed(const struct nf_queue_entry *entry) |
639 | { | |
640 | #if IS_ENABLED(CONFIG_NF_CONNTRACK) | |
641 | static const unsigned long flags = IPS_CONFIRMED | IPS_DYING; | |
642 | const struct nf_conn *ct = (void *)skb_nfct(entry->skb); | |
643 | ||
644 | if (ct && ((ct->status & flags) == IPS_DYING)) | |
645 | return true; | |
646 | #endif | |
647 | return false; | |
648 | } | |
649 | ||
7af4cc3f | 650 | static int |
a5fedd43 FW |
651 | __nfqnl_enqueue_packet(struct net *net, struct nfqnl_instance *queue, |
652 | struct nf_queue_entry *entry) | |
7af4cc3f | 653 | { |
7af4cc3f | 654 | struct sk_buff *nskb; |
f1585086 | 655 | int err = -ENOBUFS; |
5863702a | 656 | __be32 *packet_id_ptr; |
fdb694a0 | 657 | int failopen = 0; |
7af4cc3f | 658 | |
74332687 | 659 | nskb = nfqnl_build_packet_message(net, queue, entry, &packet_id_ptr); |
f1585086 FW |
660 | if (nskb == NULL) { |
661 | err = -ENOMEM; | |
0ef0f465 | 662 | goto err_out; |
f1585086 | 663 | } |
7af4cc3f | 664 | spin_lock_bh(&queue->lock); |
601e68e1 | 665 | |
5da773a3 FW |
666 | if (nf_ct_drop_unconfirmed(entry)) |
667 | goto err_out_free_nskb; | |
668 | ||
7af4cc3f | 669 | if (queue->queue_total >= queue->queue_maxlen) { |
fdb694a0 KK |
670 | if (queue->flags & NFQA_CFG_F_FAIL_OPEN) { |
671 | failopen = 1; | |
672 | err = 0; | |
673 | } else { | |
674 | queue->queue_dropped++; | |
675 | net_warn_ratelimited("nf_queue: full at %d entries, dropping packets(s)\n", | |
676 | queue->queue_total); | |
677 | } | |
7af4cc3f HW |
678 | goto err_out_free_nskb; |
679 | } | |
5863702a ED |
680 | entry->id = ++queue->id_sequence; |
681 | *packet_id_ptr = htonl(entry->id); | |
7af4cc3f HW |
682 | |
683 | /* nfnetlink_unicast will either free the nskb or add it to a socket */ | |
ee921183 | 684 | err = nfnetlink_unicast(nskb, net, queue->peer_portid); |
0ef0f465 | 685 | if (err < 0) { |
93140113 PNA |
686 | if (queue->flags & NFQA_CFG_F_FAIL_OPEN) { |
687 | failopen = 1; | |
688 | err = 0; | |
689 | } else { | |
690 | queue->queue_user_dropped++; | |
691 | } | |
7af4cc3f HW |
692 | goto err_out_unlock; |
693 | } | |
694 | ||
695 | __enqueue_entry(queue, entry); | |
696 | ||
697 | spin_unlock_bh(&queue->lock); | |
0ef0f465 | 698 | return 0; |
7af4cc3f HW |
699 | |
700 | err_out_free_nskb: | |
601e68e1 | 701 | kfree_skb(nskb); |
7af4cc3f HW |
702 | err_out_unlock: |
703 | spin_unlock_bh(&queue->lock); | |
fdb694a0 | 704 | if (failopen) |
368982cd | 705 | nfqnl_reinject(entry, NF_ACCEPT); |
0ef0f465 | 706 | err_out: |
f1585086 | 707 | return err; |
7af4cc3f HW |
708 | } |
709 | ||
a5fedd43 FW |
710 | static struct nf_queue_entry * |
711 | nf_queue_entry_dup(struct nf_queue_entry *e) | |
712 | { | |
713 | struct nf_queue_entry *entry = kmemdup(e, e->size, GFP_ATOMIC); | |
dd648bd1 FW |
714 | |
715 | if (!entry) | |
716 | return NULL; | |
717 | ||
718 | if (nf_queue_entry_get_refs(entry)) | |
719 | return entry; | |
720 | ||
721 | kfree(entry); | |
722 | return NULL; | |
a5fedd43 FW |
723 | } |
724 | ||
1109a90c | 725 | #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER) |
a5fedd43 FW |
726 | /* When called from bridge netfilter, skb->data must point to MAC header |
727 | * before calling skb_gso_segment(). Else, original MAC header is lost | |
728 | * and segmented skbs will be sent to wrong destination. | |
729 | */ | |
730 | static void nf_bridge_adjust_skb_data(struct sk_buff *skb) | |
731 | { | |
c4b0e771 | 732 | if (nf_bridge_info_get(skb)) |
a5fedd43 FW |
733 | __skb_push(skb, skb->network_header - skb->mac_header); |
734 | } | |
735 | ||
736 | static void nf_bridge_adjust_segmented_data(struct sk_buff *skb) | |
737 | { | |
c4b0e771 | 738 | if (nf_bridge_info_get(skb)) |
a5fedd43 FW |
739 | __skb_pull(skb, skb->network_header - skb->mac_header); |
740 | } | |
741 | #else | |
742 | #define nf_bridge_adjust_skb_data(s) do {} while (0) | |
743 | #define nf_bridge_adjust_segmented_data(s) do {} while (0) | |
744 | #endif | |
745 | ||
a5fedd43 FW |
746 | static int |
747 | __nfqnl_enqueue_packet_gso(struct net *net, struct nfqnl_instance *queue, | |
748 | struct sk_buff *skb, struct nf_queue_entry *entry) | |
749 | { | |
750 | int ret = -ENOMEM; | |
751 | struct nf_queue_entry *entry_seg; | |
752 | ||
753 | nf_bridge_adjust_segmented_data(skb); | |
754 | ||
755 | if (skb->next == NULL) { /* last packet, no need to copy entry */ | |
756 | struct sk_buff *gso_skb = entry->skb; | |
757 | entry->skb = skb; | |
758 | ret = __nfqnl_enqueue_packet(net, queue, entry); | |
759 | if (ret) | |
760 | entry->skb = gso_skb; | |
761 | return ret; | |
762 | } | |
763 | ||
a8305bff | 764 | skb_mark_not_on_list(skb); |
a5fedd43 FW |
765 | |
766 | entry_seg = nf_queue_entry_dup(entry); | |
767 | if (entry_seg) { | |
768 | entry_seg->skb = skb; | |
769 | ret = __nfqnl_enqueue_packet(net, queue, entry_seg); | |
770 | if (ret) | |
dd3cc111 | 771 | nf_queue_entry_free(entry_seg); |
a5fedd43 FW |
772 | } |
773 | return ret; | |
774 | } | |
775 | ||
776 | static int | |
777 | nfqnl_enqueue_packet(struct nf_queue_entry *entry, unsigned int queuenum) | |
778 | { | |
779 | unsigned int queued; | |
780 | struct nfqnl_instance *queue; | |
2670ee77 | 781 | struct sk_buff *skb, *segs, *nskb; |
a5fedd43 | 782 | int err = -ENOBUFS; |
9dff2c96 | 783 | struct net *net = entry->state.net; |
a5fedd43 FW |
784 | struct nfnl_queue_net *q = nfnl_queue_pernet(net); |
785 | ||
e2361cb9 | 786 | /* rcu_read_lock()ed by nf_hook_thresh */ |
a5fedd43 FW |
787 | queue = instance_lookup(q, queuenum); |
788 | if (!queue) | |
789 | return -ESRCH; | |
790 | ||
791 | if (queue->copy_mode == NFQNL_COPY_NONE) | |
792 | return -EINVAL; | |
793 | ||
a5fedd43 FW |
794 | skb = entry->skb; |
795 | ||
1d1de89b | 796 | switch (entry->state.pf) { |
a5fedd43 FW |
797 | case NFPROTO_IPV4: |
798 | skb->protocol = htons(ETH_P_IP); | |
799 | break; | |
800 | case NFPROTO_IPV6: | |
801 | skb->protocol = htons(ETH_P_IPV6); | |
802 | break; | |
803 | } | |
804 | ||
7b8dfe28 PNA |
805 | if ((queue->flags & NFQA_CFG_F_GSO) || !skb_is_gso(skb)) |
806 | return __nfqnl_enqueue_packet(net, queue, entry); | |
807 | ||
a5fedd43 FW |
808 | nf_bridge_adjust_skb_data(skb); |
809 | segs = skb_gso_segment(skb, 0); | |
810 | /* Does not use PTR_ERR to limit the number of error codes that can be | |
ed78d09d | 811 | * returned by nf_queue. For instance, callers rely on -ESRCH to |
a5fedd43 FW |
812 | * mean 'ignore this hook'. |
813 | */ | |
330966e5 | 814 | if (IS_ERR_OR_NULL(segs)) |
a5fedd43 FW |
815 | goto out_err; |
816 | queued = 0; | |
817 | err = 0; | |
2670ee77 | 818 | skb_list_walk_safe(segs, segs, nskb) { |
a5fedd43 FW |
819 | if (err == 0) |
820 | err = __nfqnl_enqueue_packet_gso(net, queue, | |
821 | segs, entry); | |
822 | if (err == 0) | |
823 | queued++; | |
824 | else | |
825 | kfree_skb(segs); | |
2670ee77 | 826 | } |
a5fedd43 FW |
827 | |
828 | if (queued) { | |
829 | if (err) /* some segments are already queued */ | |
dd3cc111 | 830 | nf_queue_entry_free(entry); |
a5fedd43 FW |
831 | kfree_skb(skb); |
832 | return 0; | |
833 | } | |
834 | out_err: | |
835 | nf_bridge_adjust_segmented_data(skb); | |
836 | return err; | |
837 | } | |
838 | ||
7af4cc3f | 839 | static int |
8c88f87c | 840 | nfqnl_mangle(void *data, int data_len, struct nf_queue_entry *e, int diff) |
7af4cc3f | 841 | { |
e2b58a67 | 842 | struct sk_buff *nskb; |
7af4cc3f | 843 | |
d8a585d7 PM |
844 | if (diff < 0) { |
845 | if (pskb_trim(e->skb, data_len)) | |
846 | return -ENOMEM; | |
847 | } else if (diff > 0) { | |
7af4cc3f HW |
848 | if (data_len > 0xFFFF) |
849 | return -EINVAL; | |
850 | if (diff > skb_tailroom(e->skb)) { | |
9a732ed6 AE |
851 | nskb = skb_copy_expand(e->skb, skb_headroom(e->skb), |
852 | diff, GFP_ATOMIC); | |
5191d70f | 853 | if (!nskb) |
e2b58a67 | 854 | return -ENOMEM; |
e2b58a67 PM |
855 | kfree_skb(e->skb); |
856 | e->skb = nskb; | |
7af4cc3f HW |
857 | } |
858 | skb_put(e->skb, diff); | |
859 | } | |
2cf6bffc | 860 | if (skb_ensure_writable(e->skb, data_len)) |
7af4cc3f | 861 | return -ENOMEM; |
27d7ff46 | 862 | skb_copy_to_linear_data(e->skb, data, data_len); |
e7dfb09a | 863 | e->skb->ip_summed = CHECKSUM_NONE; |
7af4cc3f HW |
864 | return 0; |
865 | } | |
866 | ||
7af4cc3f HW |
867 | static int |
868 | nfqnl_set_mode(struct nfqnl_instance *queue, | |
869 | unsigned char mode, unsigned int range) | |
870 | { | |
c5de0dfd | 871 | int status = 0; |
7af4cc3f HW |
872 | |
873 | spin_lock_bh(&queue->lock); | |
c5de0dfd PM |
874 | switch (mode) { |
875 | case NFQNL_COPY_NONE: | |
876 | case NFQNL_COPY_META: | |
877 | queue->copy_mode = mode; | |
878 | queue->copy_range = 0; | |
879 | break; | |
880 | ||
881 | case NFQNL_COPY_PACKET: | |
882 | queue->copy_mode = mode; | |
9cefbbc9 FW |
883 | if (range == 0 || range > NFQNL_MAX_COPY_RANGE) |
884 | queue->copy_range = NFQNL_MAX_COPY_RANGE; | |
c5de0dfd PM |
885 | else |
886 | queue->copy_range = range; | |
887 | break; | |
888 | ||
889 | default: | |
890 | status = -EINVAL; | |
891 | ||
892 | } | |
7af4cc3f HW |
893 | spin_unlock_bh(&queue->lock); |
894 | ||
895 | return status; | |
896 | } | |
897 | ||
898 | static int | |
02f014d8 | 899 | dev_cmp(struct nf_queue_entry *entry, unsigned long ifindex) |
7af4cc3f | 900 | { |
c4b0e771 FW |
901 | #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER) |
902 | int physinif, physoutif; | |
903 | ||
904 | physinif = nf_bridge_get_physinif(entry->skb); | |
905 | physoutif = nf_bridge_get_physoutif(entry->skb); | |
906 | ||
907 | if (physinif == ifindex || physoutif == ifindex) | |
908 | return 1; | |
909 | #endif | |
1d1de89b DM |
910 | if (entry->state.in) |
911 | if (entry->state.in->ifindex == ifindex) | |
7af4cc3f | 912 | return 1; |
1d1de89b DM |
913 | if (entry->state.out) |
914 | if (entry->state.out->ifindex == ifindex) | |
7af4cc3f | 915 | return 1; |
c737b7c4 | 916 | |
7af4cc3f HW |
917 | return 0; |
918 | } | |
919 | ||
920 | /* drop all packets with either indev or outdev == ifindex from all queue | |
921 | * instances */ | |
922 | static void | |
e8179610 | 923 | nfqnl_dev_drop(struct net *net, int ifindex) |
7af4cc3f HW |
924 | { |
925 | int i; | |
e8179610 | 926 | struct nfnl_queue_net *q = nfnl_queue_pernet(net); |
601e68e1 | 927 | |
9872bec7 | 928 | rcu_read_lock(); |
7af4cc3f | 929 | |
9872bec7 | 930 | for (i = 0; i < INSTANCE_BUCKETS; i++) { |
7af4cc3f | 931 | struct nfqnl_instance *inst; |
e8179610 | 932 | struct hlist_head *head = &q->instance_table[i]; |
7af4cc3f | 933 | |
b67bfe0d | 934 | hlist_for_each_entry_rcu(inst, head, hlist) |
b43d8d85 | 935 | nfqnl_flush(inst, dev_cmp, ifindex); |
7af4cc3f HW |
936 | } |
937 | ||
9872bec7 | 938 | rcu_read_unlock(); |
7af4cc3f HW |
939 | } |
940 | ||
7af4cc3f HW |
941 | static int |
942 | nfqnl_rcv_dev_event(struct notifier_block *this, | |
943 | unsigned long event, void *ptr) | |
944 | { | |
351638e7 | 945 | struct net_device *dev = netdev_notifier_info_to_dev(ptr); |
7af4cc3f HW |
946 | |
947 | /* Drop any packets associated with the downed device */ | |
948 | if (event == NETDEV_DOWN) | |
e8179610 | 949 | nfqnl_dev_drop(dev_net(dev), dev->ifindex); |
7af4cc3f HW |
950 | return NOTIFY_DONE; |
951 | } | |
952 | ||
953 | static struct notifier_block nfqnl_dev_notifier = { | |
954 | .notifier_call = nfqnl_rcv_dev_event, | |
955 | }; | |
956 | ||
26888dfd | 957 | static void nfqnl_nf_hook_drop(struct net *net) |
8405a8ff EB |
958 | { |
959 | struct nfnl_queue_net *q = nfnl_queue_pernet(net); | |
960 | int i; | |
961 | ||
87029970 FW |
962 | /* This function is also called on net namespace error unwind, |
963 | * when pernet_ops->init() failed and ->exit() functions of the | |
964 | * previous pernet_ops gets called. | |
965 | * | |
966 | * This may result in a call to nfqnl_nf_hook_drop() before | |
967 | * struct nfnl_queue_net was allocated. | |
968 | */ | |
969 | if (!q) | |
970 | return; | |
971 | ||
8405a8ff EB |
972 | for (i = 0; i < INSTANCE_BUCKETS; i++) { |
973 | struct nfqnl_instance *inst; | |
974 | struct hlist_head *head = &q->instance_table[i]; | |
975 | ||
26888dfd | 976 | hlist_for_each_entry_rcu(inst, head, hlist) |
039b40ee | 977 | nfqnl_flush(inst, NULL, 0); |
8405a8ff | 978 | } |
8405a8ff EB |
979 | } |
980 | ||
7af4cc3f HW |
981 | static int |
982 | nfqnl_rcv_nl_event(struct notifier_block *this, | |
983 | unsigned long event, void *ptr) | |
984 | { | |
985 | struct netlink_notify *n = ptr; | |
e8179610 | 986 | struct nfnl_queue_net *q = nfnl_queue_pernet(n->net); |
7af4cc3f | 987 | |
dee5817e | 988 | if (event == NETLINK_URELEASE && n->protocol == NETLINK_NETFILTER) { |
7af4cc3f HW |
989 | int i; |
990 | ||
15e47304 | 991 | /* destroy all instances for this portid */ |
e8179610 | 992 | spin_lock(&q->instances_lock); |
9872bec7 | 993 | for (i = 0; i < INSTANCE_BUCKETS; i++) { |
b67bfe0d | 994 | struct hlist_node *t2; |
7af4cc3f | 995 | struct nfqnl_instance *inst; |
e8179610 | 996 | struct hlist_head *head = &q->instance_table[i]; |
7af4cc3f | 997 | |
b67bfe0d | 998 | hlist_for_each_entry_safe(inst, t2, head, hlist) { |
e8179610 | 999 | if (n->portid == inst->peer_portid) |
7af4cc3f HW |
1000 | __instance_destroy(inst); |
1001 | } | |
1002 | } | |
e8179610 | 1003 | spin_unlock(&q->instances_lock); |
7af4cc3f HW |
1004 | } |
1005 | return NOTIFY_DONE; | |
1006 | } | |
1007 | ||
1008 | static struct notifier_block nfqnl_rtnl_notifier = { | |
1009 | .notifier_call = nfqnl_rcv_nl_event, | |
1010 | }; | |
1011 | ||
8d45ff22 SB |
1012 | static const struct nla_policy nfqa_vlan_policy[NFQA_VLAN_MAX + 1] = { |
1013 | [NFQA_VLAN_TCI] = { .type = NLA_U16}, | |
1014 | [NFQA_VLAN_PROTO] = { .type = NLA_U16}, | |
1015 | }; | |
1016 | ||
5bf75853 PM |
1017 | static const struct nla_policy nfqa_verdict_policy[NFQA_MAX+1] = { |
1018 | [NFQA_VERDICT_HDR] = { .len = sizeof(struct nfqnl_msg_verdict_hdr) }, | |
1019 | [NFQA_MARK] = { .type = NLA_U32 }, | |
1020 | [NFQA_PAYLOAD] = { .type = NLA_UNSPEC }, | |
9cb01766 | 1021 | [NFQA_CT] = { .type = NLA_UNSPEC }, |
bd077937 | 1022 | [NFQA_EXP] = { .type = NLA_UNSPEC }, |
8d45ff22 | 1023 | [NFQA_VLAN] = { .type = NLA_NESTED }, |
838ab636 HW |
1024 | }; |
1025 | ||
97d32cf9 FW |
1026 | static const struct nla_policy nfqa_verdict_batch_policy[NFQA_MAX+1] = { |
1027 | [NFQA_VERDICT_HDR] = { .len = sizeof(struct nfqnl_msg_verdict_hdr) }, | |
1028 | [NFQA_MARK] = { .type = NLA_U32 }, | |
1029 | }; | |
1030 | ||
e8179610 | 1031 | static struct nfqnl_instance * |
cc6bc448 | 1032 | verdict_instance_lookup(struct nfnl_queue_net *q, u16 queue_num, u32 nlportid) |
97d32cf9 FW |
1033 | { |
1034 | struct nfqnl_instance *queue; | |
1035 | ||
e8179610 | 1036 | queue = instance_lookup(q, queue_num); |
97d32cf9 FW |
1037 | if (!queue) |
1038 | return ERR_PTR(-ENODEV); | |
1039 | ||
15e47304 | 1040 | if (queue->peer_portid != nlportid) |
97d32cf9 FW |
1041 | return ERR_PTR(-EPERM); |
1042 | ||
1043 | return queue; | |
1044 | } | |
1045 | ||
1046 | static struct nfqnl_msg_verdict_hdr* | |
1047 | verdicthdr_get(const struct nlattr * const nfqa[]) | |
1048 | { | |
1049 | struct nfqnl_msg_verdict_hdr *vhdr; | |
1050 | unsigned int verdict; | |
1051 | ||
1052 | if (!nfqa[NFQA_VERDICT_HDR]) | |
1053 | return NULL; | |
1054 | ||
1055 | vhdr = nla_data(nfqa[NFQA_VERDICT_HDR]); | |
c6675233 FW |
1056 | verdict = ntohl(vhdr->verdict) & NF_VERDICT_MASK; |
1057 | if (verdict > NF_MAX_VERDICT || verdict == NF_STOLEN) | |
97d32cf9 FW |
1058 | return NULL; |
1059 | return vhdr; | |
1060 | } | |
1061 | ||
1062 | static int nfq_id_after(unsigned int id, unsigned int max) | |
1063 | { | |
1064 | return (int)(id - max) > 0; | |
1065 | } | |
1066 | ||
797d4980 PNA |
1067 | static int nfqnl_recv_verdict_batch(struct sk_buff *skb, |
1068 | const struct nfnl_info *info, | |
1069 | const struct nlattr * const nfqa[]) | |
97d32cf9 | 1070 | { |
797d4980 | 1071 | struct nfnl_queue_net *q = nfnl_queue_pernet(info->net); |
ef4b65e5 | 1072 | u16 queue_num = ntohs(info->nfmsg->res_id); |
97d32cf9 | 1073 | struct nf_queue_entry *entry, *tmp; |
97d32cf9 FW |
1074 | struct nfqnl_msg_verdict_hdr *vhdr; |
1075 | struct nfqnl_instance *queue; | |
797d4980 | 1076 | unsigned int verdict, maxid; |
97d32cf9 | 1077 | LIST_HEAD(batch_list); |
e8179610 G |
1078 | |
1079 | queue = verdict_instance_lookup(q, queue_num, | |
1080 | NETLINK_CB(skb).portid); | |
97d32cf9 FW |
1081 | if (IS_ERR(queue)) |
1082 | return PTR_ERR(queue); | |
1083 | ||
1084 | vhdr = verdicthdr_get(nfqa); | |
1085 | if (!vhdr) | |
1086 | return -EINVAL; | |
1087 | ||
1088 | verdict = ntohl(vhdr->verdict); | |
1089 | maxid = ntohl(vhdr->id); | |
1090 | ||
1091 | spin_lock_bh(&queue->lock); | |
1092 | ||
1093 | list_for_each_entry_safe(entry, tmp, &queue->queue_list, list) { | |
1094 | if (nfq_id_after(entry->id, maxid)) | |
1095 | break; | |
1096 | __dequeue_entry(queue, entry); | |
1097 | list_add_tail(&entry->list, &batch_list); | |
1098 | } | |
1099 | ||
1100 | spin_unlock_bh(&queue->lock); | |
1101 | ||
1102 | if (list_empty(&batch_list)) | |
1103 | return -ENOENT; | |
1104 | ||
1105 | list_for_each_entry_safe(entry, tmp, &batch_list, list) { | |
1106 | if (nfqa[NFQA_MARK]) | |
1107 | entry->skb->mark = ntohl(nla_get_be32(nfqa[NFQA_MARK])); | |
368982cd PNA |
1108 | |
1109 | nfqnl_reinject(entry, verdict); | |
97d32cf9 FW |
1110 | } |
1111 | return 0; | |
1112 | } | |
1113 | ||
a4b4766c | 1114 | static struct nf_conn *nfqnl_ct_parse(struct nfnl_ct_hook *nfnl_ct, |
b7bd1809 PNA |
1115 | const struct nlmsghdr *nlh, |
1116 | const struct nlattr * const nfqa[], | |
1117 | struct nf_queue_entry *entry, | |
1118 | enum ip_conntrack_info *ctinfo) | |
1119 | { | |
83ace77f | 1120 | #if IS_ENABLED(CONFIG_NF_CONNTRACK) |
b7bd1809 PNA |
1121 | struct nf_conn *ct; |
1122 | ||
83ace77f | 1123 | ct = nf_ct_get(entry->skb, ctinfo); |
b7bd1809 PNA |
1124 | if (ct == NULL) |
1125 | return NULL; | |
1126 | ||
a4b4766c | 1127 | if (nfnl_ct->parse(nfqa[NFQA_CT], ct) < 0) |
b7bd1809 PNA |
1128 | return NULL; |
1129 | ||
1130 | if (nfqa[NFQA_EXP]) | |
a4b4766c | 1131 | nfnl_ct->attach_expect(nfqa[NFQA_EXP], ct, |
b7bd1809 PNA |
1132 | NETLINK_CB(entry->skb).portid, |
1133 | nlmsg_report(nlh)); | |
1134 | return ct; | |
83ace77f FW |
1135 | #else |
1136 | return NULL; | |
1137 | #endif | |
b7bd1809 PNA |
1138 | } |
1139 | ||
8d45ff22 SB |
1140 | static int nfqa_parse_bridge(struct nf_queue_entry *entry, |
1141 | const struct nlattr * const nfqa[]) | |
1142 | { | |
1143 | if (nfqa[NFQA_VLAN]) { | |
1144 | struct nlattr *tb[NFQA_VLAN_MAX + 1]; | |
1145 | int err; | |
1146 | ||
8cb08174 JB |
1147 | err = nla_parse_nested_deprecated(tb, NFQA_VLAN_MAX, |
1148 | nfqa[NFQA_VLAN], | |
1149 | nfqa_vlan_policy, NULL); | |
8d45ff22 SB |
1150 | if (err < 0) |
1151 | return err; | |
1152 | ||
1153 | if (!tb[NFQA_VLAN_TCI] || !tb[NFQA_VLAN_PROTO]) | |
1154 | return -EINVAL; | |
1155 | ||
82eea4cf MM |
1156 | __vlan_hwaccel_put_tag(entry->skb, |
1157 | nla_get_be16(tb[NFQA_VLAN_PROTO]), | |
1158 | ntohs(nla_get_be16(tb[NFQA_VLAN_TCI]))); | |
8d45ff22 SB |
1159 | } |
1160 | ||
1161 | if (nfqa[NFQA_L2HDR]) { | |
1162 | int mac_header_len = entry->skb->network_header - | |
1163 | entry->skb->mac_header; | |
1164 | ||
1165 | if (mac_header_len != nla_len(nfqa[NFQA_L2HDR])) | |
1166 | return -EINVAL; | |
1167 | else if (mac_header_len > 0) | |
1168 | memcpy(skb_mac_header(entry->skb), | |
1169 | nla_data(nfqa[NFQA_L2HDR]), | |
1170 | mac_header_len); | |
1171 | } | |
1172 | ||
1173 | return 0; | |
1174 | } | |
1175 | ||
797d4980 PNA |
1176 | static int nfqnl_recv_verdict(struct sk_buff *skb, const struct nfnl_info *info, |
1177 | const struct nlattr * const nfqa[]) | |
7af4cc3f | 1178 | { |
797d4980 | 1179 | struct nfnl_queue_net *q = nfnl_queue_pernet(info->net); |
ef4b65e5 | 1180 | u_int16_t queue_num = ntohs(info->nfmsg->res_id); |
7af4cc3f | 1181 | struct nfqnl_msg_verdict_hdr *vhdr; |
797d4980 | 1182 | enum ip_conntrack_info ctinfo; |
7af4cc3f | 1183 | struct nfqnl_instance *queue; |
02f014d8 | 1184 | struct nf_queue_entry *entry; |
a4b4766c | 1185 | struct nfnl_ct_hook *nfnl_ct; |
8c88f87c | 1186 | struct nf_conn *ct = NULL; |
797d4980 | 1187 | unsigned int verdict; |
8d45ff22 | 1188 | int err; |
7af4cc3f | 1189 | |
00a3101f LZ |
1190 | queue = verdict_instance_lookup(q, queue_num, |
1191 | NETLINK_CB(skb).portid); | |
97d32cf9 FW |
1192 | if (IS_ERR(queue)) |
1193 | return PTR_ERR(queue); | |
7af4cc3f | 1194 | |
97d32cf9 FW |
1195 | vhdr = verdicthdr_get(nfqa); |
1196 | if (!vhdr) | |
84a797dd | 1197 | return -EINVAL; |
7af4cc3f | 1198 | |
7af4cc3f HW |
1199 | verdict = ntohl(vhdr->verdict); |
1200 | ||
b43d8d85 | 1201 | entry = find_dequeue_entry(queue, ntohl(vhdr->id)); |
84a797dd ED |
1202 | if (entry == NULL) |
1203 | return -ENOENT; | |
7af4cc3f | 1204 | |
8e662164 AB |
1205 | /* rcu lock already held from nfnl->call_rcu. */ |
1206 | nfnl_ct = rcu_dereference(nfnl_ct_hook); | |
1207 | ||
bd077937 | 1208 | if (nfqa[NFQA_CT]) { |
a4b4766c | 1209 | if (nfnl_ct != NULL) |
797d4980 PNA |
1210 | ct = nfqnl_ct_parse(nfnl_ct, info->nlh, nfqa, entry, |
1211 | &ctinfo); | |
bd077937 | 1212 | } |
9cb01766 | 1213 | |
8d45ff22 SB |
1214 | if (entry->state.pf == PF_BRIDGE) { |
1215 | err = nfqa_parse_bridge(entry, nfqa); | |
1216 | if (err < 0) | |
1217 | return err; | |
1218 | } | |
1219 | ||
df6fb868 | 1220 | if (nfqa[NFQA_PAYLOAD]) { |
8c88f87c PNA |
1221 | u16 payload_len = nla_len(nfqa[NFQA_PAYLOAD]); |
1222 | int diff = payload_len - entry->skb->len; | |
1223 | ||
df6fb868 | 1224 | if (nfqnl_mangle(nla_data(nfqa[NFQA_PAYLOAD]), |
8c88f87c | 1225 | payload_len, entry, diff) < 0) |
7af4cc3f | 1226 | verdict = NF_DROP; |
8c88f87c | 1227 | |
b7bd1809 | 1228 | if (ct && diff) |
a4b4766c | 1229 | nfnl_ct->seq_adjust(entry->skb, ct, ctinfo, diff); |
7af4cc3f HW |
1230 | } |
1231 | ||
df6fb868 | 1232 | if (nfqa[NFQA_MARK]) |
ea3a66ff | 1233 | entry->skb->mark = ntohl(nla_get_be32(nfqa[NFQA_MARK])); |
601e68e1 | 1234 | |
368982cd | 1235 | nfqnl_reinject(entry, verdict); |
7af4cc3f HW |
1236 | return 0; |
1237 | } | |
1238 | ||
797d4980 PNA |
1239 | static int nfqnl_recv_unsupp(struct sk_buff *skb, const struct nfnl_info *info, |
1240 | const struct nlattr * const cda[]) | |
7af4cc3f HW |
1241 | { |
1242 | return -ENOTSUPP; | |
1243 | } | |
1244 | ||
5bf75853 PM |
1245 | static const struct nla_policy nfqa_cfg_policy[NFQA_CFG_MAX+1] = { |
1246 | [NFQA_CFG_CMD] = { .len = sizeof(struct nfqnl_msg_config_cmd) }, | |
1247 | [NFQA_CFG_PARAMS] = { .len = sizeof(struct nfqnl_msg_config_params) }, | |
ba062ebb ED |
1248 | [NFQA_CFG_QUEUE_MAXLEN] = { .type = NLA_U32 }, |
1249 | [NFQA_CFG_MASK] = { .type = NLA_U32 }, | |
1250 | [NFQA_CFG_FLAGS] = { .type = NLA_U32 }, | |
838ab636 HW |
1251 | }; |
1252 | ||
e3ac5298 | 1253 | static const struct nf_queue_handler nfqh = { |
d4ef3835 AS |
1254 | .outfn = nfqnl_enqueue_packet, |
1255 | .nf_hook_drop = nfqnl_nf_hook_drop, | |
bbd86b9f HW |
1256 | }; |
1257 | ||
a6555365 PNA |
1258 | static int nfqnl_recv_config(struct sk_buff *skb, const struct nfnl_info *info, |
1259 | const struct nlattr * const nfqa[]) | |
7af4cc3f | 1260 | { |
a6555365 | 1261 | struct nfnl_queue_net *q = nfnl_queue_pernet(info->net); |
ef4b65e5 | 1262 | u_int16_t queue_num = ntohs(info->nfmsg->res_id); |
9872bec7 | 1263 | struct nfqnl_msg_config_cmd *cmd = NULL; |
a6555365 | 1264 | struct nfqnl_instance *queue; |
60d2c7f9 | 1265 | __u32 flags = 0, mask = 0; |
838ab636 | 1266 | int ret = 0; |
7af4cc3f | 1267 | |
9872bec7 PM |
1268 | if (nfqa[NFQA_CFG_CMD]) { |
1269 | cmd = nla_data(nfqa[NFQA_CFG_CMD]); | |
1270 | ||
0360ae41 | 1271 | /* Obsolete commands without queue context */ |
9872bec7 | 1272 | switch (cmd->command) { |
0360ae41 FW |
1273 | case NFQNL_CFG_CMD_PF_BIND: return 0; |
1274 | case NFQNL_CFG_CMD_PF_UNBIND: return 0; | |
9872bec7 | 1275 | } |
9872bec7 PM |
1276 | } |
1277 | ||
60d2c7f9 KM |
1278 | /* Check if we support these flags in first place, dependencies should |
1279 | * be there too not to break atomicity. | |
1280 | */ | |
1281 | if (nfqa[NFQA_CFG_FLAGS]) { | |
1282 | if (!nfqa[NFQA_CFG_MASK]) { | |
1283 | /* A mask is needed to specify which flags are being | |
1284 | * changed. | |
1285 | */ | |
1286 | return -EINVAL; | |
1287 | } | |
1288 | ||
1289 | flags = ntohl(nla_get_be32(nfqa[NFQA_CFG_FLAGS])); | |
1290 | mask = ntohl(nla_get_be32(nfqa[NFQA_CFG_MASK])); | |
1291 | ||
1292 | if (flags >= NFQA_CFG_F_MAX) | |
1293 | return -EOPNOTSUPP; | |
1294 | ||
1295 | #if !IS_ENABLED(CONFIG_NETWORK_SECMARK) | |
1296 | if (flags & mask & NFQA_CFG_F_SECCTX) | |
1297 | return -EOPNOTSUPP; | |
1298 | #endif | |
71b2e5f5 KM |
1299 | if ((flags & mask & NFQA_CFG_F_CONNTRACK) && |
1300 | !rcu_access_pointer(nfnl_ct_hook)) { | |
1301 | #ifdef CONFIG_MODULES | |
1302 | nfnl_unlock(NFNL_SUBSYS_QUEUE); | |
1303 | request_module("ip_conntrack_netlink"); | |
1304 | nfnl_lock(NFNL_SUBSYS_QUEUE); | |
1305 | if (rcu_access_pointer(nfnl_ct_hook)) | |
1306 | return -EAGAIN; | |
1307 | #endif | |
1308 | return -EOPNOTSUPP; | |
1309 | } | |
60d2c7f9 KM |
1310 | } |
1311 | ||
9872bec7 | 1312 | rcu_read_lock(); |
e8179610 | 1313 | queue = instance_lookup(q, queue_num); |
15e47304 | 1314 | if (queue && queue->peer_portid != NETLINK_CB(skb).portid) { |
a3c8e7fd | 1315 | ret = -EPERM; |
9872bec7 | 1316 | goto err_out_unlock; |
a3c8e7fd PM |
1317 | } |
1318 | ||
9872bec7 | 1319 | if (cmd != NULL) { |
7af4cc3f HW |
1320 | switch (cmd->command) { |
1321 | case NFQNL_CFG_CMD_BIND: | |
9872bec7 PM |
1322 | if (queue) { |
1323 | ret = -EBUSY; | |
1324 | goto err_out_unlock; | |
1325 | } | |
e8179610 G |
1326 | queue = instance_create(q, queue_num, |
1327 | NETLINK_CB(skb).portid); | |
baab2ce7 PM |
1328 | if (IS_ERR(queue)) { |
1329 | ret = PTR_ERR(queue); | |
9872bec7 PM |
1330 | goto err_out_unlock; |
1331 | } | |
7af4cc3f HW |
1332 | break; |
1333 | case NFQNL_CFG_CMD_UNBIND: | |
9872bec7 PM |
1334 | if (!queue) { |
1335 | ret = -ENODEV; | |
1336 | goto err_out_unlock; | |
1337 | } | |
e8179610 | 1338 | instance_destroy(q, queue); |
17bc6b48 | 1339 | goto err_out_unlock; |
7af4cc3f | 1340 | case NFQNL_CFG_CMD_PF_BIND: |
7af4cc3f | 1341 | case NFQNL_CFG_CMD_PF_UNBIND: |
7af4cc3f HW |
1342 | break; |
1343 | default: | |
cd21f0ac | 1344 | ret = -ENOTSUPP; |
21c3c971 | 1345 | goto err_out_unlock; |
7af4cc3f | 1346 | } |
7af4cc3f HW |
1347 | } |
1348 | ||
60d2c7f9 KM |
1349 | if (!queue) { |
1350 | ret = -ENODEV; | |
1351 | goto err_out_unlock; | |
1352 | } | |
1353 | ||
df6fb868 | 1354 | if (nfqa[NFQA_CFG_PARAMS]) { |
60d2c7f9 KM |
1355 | struct nfqnl_msg_config_params *params = |
1356 | nla_data(nfqa[NFQA_CFG_PARAMS]); | |
7af4cc3f HW |
1357 | |
1358 | nfqnl_set_mode(queue, params->copy_mode, | |
1359 | ntohl(params->copy_range)); | |
1360 | } | |
1361 | ||
df6fb868 | 1362 | if (nfqa[NFQA_CFG_QUEUE_MAXLEN]) { |
60d2c7f9 | 1363 | __be32 *queue_maxlen = nla_data(nfqa[NFQA_CFG_QUEUE_MAXLEN]); |
a3c8e7fd | 1364 | |
829e17a1 EL |
1365 | spin_lock_bh(&queue->lock); |
1366 | queue->queue_maxlen = ntohl(*queue_maxlen); | |
1367 | spin_unlock_bh(&queue->lock); | |
1368 | } | |
1369 | ||
fdb694a0 | 1370 | if (nfqa[NFQA_CFG_FLAGS]) { |
fdb694a0 KK |
1371 | spin_lock_bh(&queue->lock); |
1372 | queue->flags &= ~mask; | |
1373 | queue->flags |= flags & mask; | |
1374 | spin_unlock_bh(&queue->lock); | |
1375 | } | |
1376 | ||
9872bec7 PM |
1377 | err_out_unlock: |
1378 | rcu_read_unlock(); | |
838ab636 | 1379 | return ret; |
7af4cc3f HW |
1380 | } |
1381 | ||
7c8d4cb4 | 1382 | static const struct nfnl_callback nfqnl_cb[NFQNL_MSG_MAX] = { |
50f2db9e PNA |
1383 | [NFQNL_MSG_PACKET] = { |
1384 | .call = nfqnl_recv_unsupp, | |
1385 | .type = NFNL_CB_RCU, | |
1386 | .attr_count = NFQA_MAX, | |
1387 | }, | |
1388 | [NFQNL_MSG_VERDICT] = { | |
1389 | .call = nfqnl_recv_verdict, | |
1390 | .type = NFNL_CB_RCU, | |
1391 | .attr_count = NFQA_MAX, | |
1392 | .policy = nfqa_verdict_policy | |
1393 | }, | |
1394 | [NFQNL_MSG_CONFIG] = { | |
1395 | .call = nfqnl_recv_config, | |
1396 | .type = NFNL_CB_MUTEX, | |
1397 | .attr_count = NFQA_CFG_MAX, | |
1398 | .policy = nfqa_cfg_policy | |
1399 | }, | |
1400 | [NFQNL_MSG_VERDICT_BATCH] = { | |
1401 | .call = nfqnl_recv_verdict_batch, | |
1402 | .type = NFNL_CB_RCU, | |
1403 | .attr_count = NFQA_MAX, | |
1404 | .policy = nfqa_verdict_batch_policy | |
1405 | }, | |
7af4cc3f HW |
1406 | }; |
1407 | ||
7c8d4cb4 | 1408 | static const struct nfnetlink_subsystem nfqnl_subsys = { |
7af4cc3f HW |
1409 | .name = "nf_queue", |
1410 | .subsys_id = NFNL_SUBSYS_QUEUE, | |
1411 | .cb_count = NFQNL_MSG_MAX, | |
7af4cc3f HW |
1412 | .cb = nfqnl_cb, |
1413 | }; | |
1414 | ||
838ab636 HW |
1415 | #ifdef CONFIG_PROC_FS |
1416 | struct iter_state { | |
e8179610 | 1417 | struct seq_net_private p; |
838ab636 HW |
1418 | unsigned int bucket; |
1419 | }; | |
1420 | ||
1421 | static struct hlist_node *get_first(struct seq_file *seq) | |
1422 | { | |
1423 | struct iter_state *st = seq->private; | |
e8179610 G |
1424 | struct net *net; |
1425 | struct nfnl_queue_net *q; | |
838ab636 HW |
1426 | |
1427 | if (!st) | |
1428 | return NULL; | |
1429 | ||
e8179610 G |
1430 | net = seq_file_net(seq); |
1431 | q = nfnl_queue_pernet(net); | |
838ab636 | 1432 | for (st->bucket = 0; st->bucket < INSTANCE_BUCKETS; st->bucket++) { |
e8179610 G |
1433 | if (!hlist_empty(&q->instance_table[st->bucket])) |
1434 | return q->instance_table[st->bucket].first; | |
838ab636 HW |
1435 | } |
1436 | return NULL; | |
1437 | } | |
1438 | ||
1439 | static struct hlist_node *get_next(struct seq_file *seq, struct hlist_node *h) | |
1440 | { | |
1441 | struct iter_state *st = seq->private; | |
e8179610 | 1442 | struct net *net = seq_file_net(seq); |
838ab636 HW |
1443 | |
1444 | h = h->next; | |
1445 | while (!h) { | |
e8179610 G |
1446 | struct nfnl_queue_net *q; |
1447 | ||
838ab636 HW |
1448 | if (++st->bucket >= INSTANCE_BUCKETS) |
1449 | return NULL; | |
1450 | ||
e8179610 G |
1451 | q = nfnl_queue_pernet(net); |
1452 | h = q->instance_table[st->bucket].first; | |
838ab636 HW |
1453 | } |
1454 | return h; | |
1455 | } | |
1456 | ||
1457 | static struct hlist_node *get_idx(struct seq_file *seq, loff_t pos) | |
1458 | { | |
1459 | struct hlist_node *head; | |
1460 | head = get_first(seq); | |
1461 | ||
1462 | if (head) | |
1463 | while (pos && (head = get_next(seq, head))) | |
1464 | pos--; | |
1465 | return pos ? NULL : head; | |
1466 | } | |
1467 | ||
e8179610 G |
1468 | static void *seq_start(struct seq_file *s, loff_t *pos) |
1469 | __acquires(nfnl_queue_pernet(seq_file_net(s))->instances_lock) | |
838ab636 | 1470 | { |
e8179610 G |
1471 | spin_lock(&nfnl_queue_pernet(seq_file_net(s))->instances_lock); |
1472 | return get_idx(s, *pos); | |
838ab636 HW |
1473 | } |
1474 | ||
1475 | static void *seq_next(struct seq_file *s, void *v, loff_t *pos) | |
1476 | { | |
1477 | (*pos)++; | |
1478 | return get_next(s, v); | |
1479 | } | |
1480 | ||
1481 | static void seq_stop(struct seq_file *s, void *v) | |
e8179610 | 1482 | __releases(nfnl_queue_pernet(seq_file_net(s))->instances_lock) |
838ab636 | 1483 | { |
e8179610 | 1484 | spin_unlock(&nfnl_queue_pernet(seq_file_net(s))->instances_lock); |
838ab636 HW |
1485 | } |
1486 | ||
1487 | static int seq_show(struct seq_file *s, void *v) | |
1488 | { | |
1489 | const struct nfqnl_instance *inst = v; | |
1490 | ||
6b46f7b7 | 1491 | seq_printf(s, "%5u %6u %5u %1u %5u %5u %5u %8u %2d\n", |
e71456ae SRRH |
1492 | inst->queue_num, |
1493 | inst->peer_portid, inst->queue_total, | |
1494 | inst->copy_mode, inst->copy_range, | |
1495 | inst->queue_dropped, inst->queue_user_dropped, | |
1496 | inst->id_sequence, 1); | |
861fb107 | 1497 | return 0; |
838ab636 HW |
1498 | } |
1499 | ||
56b3d975 | 1500 | static const struct seq_operations nfqnl_seq_ops = { |
838ab636 HW |
1501 | .start = seq_start, |
1502 | .next = seq_next, | |
1503 | .stop = seq_stop, | |
1504 | .show = seq_show, | |
1505 | }; | |
838ab636 HW |
1506 | #endif /* PROC_FS */ |
1507 | ||
e8179610 | 1508 | static int __net_init nfnl_queue_net_init(struct net *net) |
7af4cc3f | 1509 | { |
e8179610 G |
1510 | unsigned int i; |
1511 | struct nfnl_queue_net *q = nfnl_queue_pernet(net); | |
601e68e1 | 1512 | |
838ab636 | 1513 | for (i = 0; i < INSTANCE_BUCKETS; i++) |
e8179610 G |
1514 | INIT_HLIST_HEAD(&q->instance_table[i]); |
1515 | ||
1516 | spin_lock_init(&q->instances_lock); | |
1517 | ||
1518 | #ifdef CONFIG_PROC_FS | |
c3506372 CH |
1519 | if (!proc_create_net("nfnetlink_queue", 0440, net->nf.proc_netfilter, |
1520 | &nfqnl_seq_ops, sizeof(struct iter_state))) | |
e8179610 G |
1521 | return -ENOMEM; |
1522 | #endif | |
1523 | return 0; | |
1524 | } | |
1525 | ||
1526 | static void __net_exit nfnl_queue_net_exit(struct net *net) | |
1527 | { | |
613d0776 VA |
1528 | struct nfnl_queue_net *q = nfnl_queue_pernet(net); |
1529 | unsigned int i; | |
1530 | ||
e778f56e | 1531 | #ifdef CONFIG_PROC_FS |
e8179610 | 1532 | remove_proc_entry("nfnetlink_queue", net->nf.proc_netfilter); |
e778f56e | 1533 | #endif |
613d0776 VA |
1534 | for (i = 0; i < INSTANCE_BUCKETS; i++) |
1535 | WARN_ON_ONCE(!hlist_empty(&q->instance_table[i])); | |
e8179610 G |
1536 | } |
1537 | ||
dc3ee32e EB |
1538 | static void nfnl_queue_net_exit_batch(struct list_head *net_exit_list) |
1539 | { | |
1540 | synchronize_rcu(); | |
1541 | } | |
1542 | ||
e8179610 | 1543 | static struct pernet_operations nfnl_queue_net_ops = { |
dc3ee32e EB |
1544 | .init = nfnl_queue_net_init, |
1545 | .exit = nfnl_queue_net_exit, | |
1546 | .exit_batch = nfnl_queue_net_exit_batch, | |
1547 | .id = &nfnl_queue_net_id, | |
1548 | .size = sizeof(struct nfnl_queue_net), | |
e8179610 G |
1549 | }; |
1550 | ||
1551 | static int __init nfnetlink_queue_init(void) | |
1552 | { | |
3bfe0498 FR |
1553 | int status; |
1554 | ||
1555 | status = register_pernet_subsys(&nfnl_queue_net_ops); | |
1556 | if (status < 0) { | |
5191d70f | 1557 | pr_err("failed to register pernet ops\n"); |
3bfe0498 FR |
1558 | goto out; |
1559 | } | |
838ab636 | 1560 | |
7af4cc3f HW |
1561 | netlink_register_notifier(&nfqnl_rtnl_notifier); |
1562 | status = nfnetlink_subsys_register(&nfqnl_subsys); | |
1563 | if (status < 0) { | |
5191d70f | 1564 | pr_err("failed to create netlink socket\n"); |
7af4cc3f HW |
1565 | goto cleanup_netlink_notifier; |
1566 | } | |
1567 | ||
4e6577de GF |
1568 | status = register_netdevice_notifier(&nfqnl_dev_notifier); |
1569 | if (status < 0) { | |
5191d70f | 1570 | pr_err("failed to register netdevice notifier\n"); |
4e6577de GF |
1571 | goto cleanup_netlink_subsys; |
1572 | } | |
1573 | ||
87029970 FW |
1574 | nf_register_queue_handler(&nfqh); |
1575 | ||
7af4cc3f HW |
1576 | return status; |
1577 | ||
4e6577de GF |
1578 | cleanup_netlink_subsys: |
1579 | nfnetlink_subsys_unregister(&nfqnl_subsys); | |
7af4cc3f HW |
1580 | cleanup_netlink_notifier: |
1581 | netlink_unregister_notifier(&nfqnl_rtnl_notifier); | |
639e077b | 1582 | unregister_pernet_subsys(&nfnl_queue_net_ops); |
3bfe0498 | 1583 | out: |
7af4cc3f HW |
1584 | return status; |
1585 | } | |
1586 | ||
65b4b4e8 | 1587 | static void __exit nfnetlink_queue_fini(void) |
7af4cc3f | 1588 | { |
87029970 | 1589 | nf_unregister_queue_handler(); |
32292a7f | 1590 | unregister_netdevice_notifier(&nfqnl_dev_notifier); |
32292a7f PM |
1591 | nfnetlink_subsys_unregister(&nfqnl_subsys); |
1592 | netlink_unregister_notifier(&nfqnl_rtnl_notifier); | |
3bfe0498 | 1593 | unregister_pernet_subsys(&nfnl_queue_net_ops); |
67137f3c JDB |
1594 | |
1595 | rcu_barrier(); /* Wait for completion of call_rcu()'s */ | |
7af4cc3f HW |
1596 | } |
1597 | ||
1598 | MODULE_DESCRIPTION("netfilter packet queue handler"); | |
1599 | MODULE_AUTHOR("Harald Welte <laforge@netfilter.org>"); | |
1600 | MODULE_LICENSE("GPL"); | |
1601 | MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_QUEUE); | |
1602 | ||
65b4b4e8 AM |
1603 | module_init(nfnetlink_queue_init); |
1604 | module_exit(nfnetlink_queue_fini); |