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Commit | Line | Data |
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0597f268 HW |
1 | /* |
2 | * This is a module which is used for logging packets to userspace via | |
3 | * nfetlink. | |
4 | * | |
5 | * (C) 2005 by Harald Welte <laforge@netfilter.org> | |
6 | * | |
7 | * Based on the old ipv4-only ipt_ULOG.c: | |
8 | * (C) 2000-2004 by Harald Welte <laforge@netfilter.org> | |
9 | * | |
10 | * This program is free software; you can redistribute it and/or modify | |
11 | * it under the terms of the GNU General Public License version 2 as | |
12 | * published by the Free Software Foundation. | |
0597f268 HW |
13 | */ |
14 | #include <linux/module.h> | |
15 | #include <linux/skbuff.h> | |
16 | #include <linux/init.h> | |
17 | #include <linux/ip.h> | |
18 | #include <linux/ipv6.h> | |
19 | #include <linux/netdevice.h> | |
20 | #include <linux/netfilter.h> | |
21 | #include <linux/netlink.h> | |
22 | #include <linux/netfilter/nfnetlink.h> | |
23 | #include <linux/netfilter/nfnetlink_log.h> | |
24 | #include <linux/spinlock.h> | |
25 | #include <linux/sysctl.h> | |
26 | #include <linux/proc_fs.h> | |
27 | #include <linux/security.h> | |
28 | #include <linux/list.h> | |
29 | #include <linux/jhash.h> | |
30 | #include <linux/random.h> | |
5a0e3ad6 | 31 | #include <linux/slab.h> |
0597f268 | 32 | #include <net/sock.h> |
f01ffbd6 | 33 | #include <net/netfilter/nf_log.h> |
d9e15007 | 34 | #include <net/netfilter/nfnetlink_log.h> |
0597f268 | 35 | |
60063497 | 36 | #include <linux/atomic.h> |
0597f268 | 37 | |
fbcd923c HW |
38 | #ifdef CONFIG_BRIDGE_NETFILTER |
39 | #include "../bridge/br_private.h" | |
40 | #endif | |
41 | ||
c2db2924 | 42 | #define NFULNL_NLBUFSIZ_DEFAULT NLMSG_GOODSIZE |
2c6764b7 | 43 | #define NFULNL_TIMEOUT_DEFAULT 100 /* every second */ |
0597f268 | 44 | #define NFULNL_QTHRESH_DEFAULT 100 /* 100 packets */ |
6b6ec99a | 45 | #define NFULNL_COPY_RANGE_MAX 0xFFFF /* max packet size is limited by 16-bit struct nfattr nfa_len field */ |
0597f268 HW |
46 | |
47 | #define PRINTR(x, args...) do { if (net_ratelimit()) \ | |
48 | printk(x, ## args); } while (0); | |
49 | ||
0597f268 HW |
50 | struct nfulnl_instance { |
51 | struct hlist_node hlist; /* global list of instances */ | |
52 | spinlock_t lock; | |
53 | atomic_t use; /* use count */ | |
54 | ||
55 | unsigned int qlen; /* number of nlmsgs in skb */ | |
56 | struct sk_buff *skb; /* pre-allocatd skb */ | |
0597f268 | 57 | struct timer_list timer; |
9eea9515 | 58 | struct user_namespace *peer_user_ns; /* User namespace of the peer process */ |
0597f268 HW |
59 | int peer_pid; /* PID of the peer process */ |
60 | ||
61 | /* configurable parameters */ | |
62 | unsigned int flushtimeout; /* timeout until queue flush */ | |
63 | unsigned int nlbufsiz; /* netlink buffer allocation size */ | |
64 | unsigned int qthreshold; /* threshold of the queue */ | |
65 | u_int32_t copy_range; | |
0af5f6c1 | 66 | u_int32_t seq; /* instance-local sequential counter */ |
0597f268 | 67 | u_int16_t group_num; /* number of this queue */ |
0af5f6c1 | 68 | u_int16_t flags; |
601e68e1 | 69 | u_int8_t copy_mode; |
bed1be20 | 70 | struct rcu_head rcu; |
0597f268 HW |
71 | }; |
72 | ||
bed1be20 | 73 | static DEFINE_SPINLOCK(instances_lock); |
0af5f6c1 | 74 | static atomic_t global_seq; |
0597f268 HW |
75 | |
76 | #define INSTANCE_BUCKETS 16 | |
77 | static struct hlist_head instance_table[INSTANCE_BUCKETS]; | |
78 | static unsigned int hash_init; | |
79 | ||
80 | static inline u_int8_t instance_hashfn(u_int16_t group_num) | |
81 | { | |
82 | return ((group_num & 0xff) % INSTANCE_BUCKETS); | |
83 | } | |
84 | ||
85 | static struct nfulnl_instance * | |
86 | __instance_lookup(u_int16_t group_num) | |
87 | { | |
88 | struct hlist_head *head; | |
89 | struct hlist_node *pos; | |
90 | struct nfulnl_instance *inst; | |
91 | ||
0597f268 | 92 | head = &instance_table[instance_hashfn(group_num)]; |
bed1be20 | 93 | hlist_for_each_entry_rcu(inst, pos, head, hlist) { |
0597f268 HW |
94 | if (inst->group_num == group_num) |
95 | return inst; | |
96 | } | |
97 | return NULL; | |
98 | } | |
99 | ||
100 | static inline void | |
101 | instance_get(struct nfulnl_instance *inst) | |
102 | { | |
103 | atomic_inc(&inst->use); | |
104 | } | |
105 | ||
106 | static struct nfulnl_instance * | |
107 | instance_lookup_get(u_int16_t group_num) | |
108 | { | |
109 | struct nfulnl_instance *inst; | |
110 | ||
bed1be20 | 111 | rcu_read_lock_bh(); |
0597f268 | 112 | inst = __instance_lookup(group_num); |
f5c5440d ED |
113 | if (inst && !atomic_inc_not_zero(&inst->use)) |
114 | inst = NULL; | |
bed1be20 | 115 | rcu_read_unlock_bh(); |
0597f268 HW |
116 | |
117 | return inst; | |
118 | } | |
119 | ||
bed1be20 ED |
120 | static void nfulnl_instance_free_rcu(struct rcu_head *head) |
121 | { | |
122 | kfree(container_of(head, struct nfulnl_instance, rcu)); | |
123 | module_put(THIS_MODULE); | |
124 | } | |
125 | ||
0597f268 HW |
126 | static void |
127 | instance_put(struct nfulnl_instance *inst) | |
128 | { | |
bed1be20 ED |
129 | if (inst && atomic_dec_and_test(&inst->use)) |
130 | call_rcu_bh(&inst->rcu, nfulnl_instance_free_rcu); | |
0597f268 HW |
131 | } |
132 | ||
133 | static void nfulnl_timer(unsigned long data); | |
134 | ||
135 | static struct nfulnl_instance * | |
9eea9515 | 136 | instance_create(u_int16_t group_num, int pid, struct user_namespace *user_ns) |
0597f268 HW |
137 | { |
138 | struct nfulnl_instance *inst; | |
baab2ce7 | 139 | int err; |
0597f268 | 140 | |
bed1be20 | 141 | spin_lock_bh(&instances_lock); |
0597f268 | 142 | if (__instance_lookup(group_num)) { |
baab2ce7 | 143 | err = -EEXIST; |
0597f268 HW |
144 | goto out_unlock; |
145 | } | |
146 | ||
10dfdc69 | 147 | inst = kzalloc(sizeof(*inst), GFP_ATOMIC); |
baab2ce7 PM |
148 | if (!inst) { |
149 | err = -ENOMEM; | |
0597f268 | 150 | goto out_unlock; |
baab2ce7 | 151 | } |
0597f268 | 152 | |
aace57e0 MM |
153 | if (!try_module_get(THIS_MODULE)) { |
154 | kfree(inst); | |
baab2ce7 | 155 | err = -EAGAIN; |
aace57e0 MM |
156 | goto out_unlock; |
157 | } | |
158 | ||
0597f268 | 159 | INIT_HLIST_NODE(&inst->hlist); |
181a46a5 | 160 | spin_lock_init(&inst->lock); |
0597f268 HW |
161 | /* needs to be two, since we _put() after creation */ |
162 | atomic_set(&inst->use, 2); | |
163 | ||
e6f689db | 164 | setup_timer(&inst->timer, nfulnl_timer, (unsigned long)inst); |
0597f268 | 165 | |
9eea9515 | 166 | inst->peer_user_ns = user_ns; |
0597f268 HW |
167 | inst->peer_pid = pid; |
168 | inst->group_num = group_num; | |
169 | ||
170 | inst->qthreshold = NFULNL_QTHRESH_DEFAULT; | |
171 | inst->flushtimeout = NFULNL_TIMEOUT_DEFAULT; | |
172 | inst->nlbufsiz = NFULNL_NLBUFSIZ_DEFAULT; | |
173 | inst->copy_mode = NFULNL_COPY_PACKET; | |
6b6ec99a | 174 | inst->copy_range = NFULNL_COPY_RANGE_MAX; |
0597f268 | 175 | |
f5c5440d | 176 | hlist_add_head_rcu(&inst->hlist, |
0597f268 HW |
177 | &instance_table[instance_hashfn(group_num)]); |
178 | ||
bed1be20 | 179 | spin_unlock_bh(&instances_lock); |
0597f268 HW |
180 | |
181 | return inst; | |
182 | ||
0597f268 | 183 | out_unlock: |
bed1be20 | 184 | spin_unlock_bh(&instances_lock); |
baab2ce7 | 185 | return ERR_PTR(err); |
0597f268 HW |
186 | } |
187 | ||
e3567061 | 188 | static void __nfulnl_flush(struct nfulnl_instance *inst); |
0597f268 | 189 | |
f5c5440d | 190 | /* called with BH disabled */ |
0597f268 | 191 | static void |
9afdb00c | 192 | __instance_destroy(struct nfulnl_instance *inst) |
0597f268 HW |
193 | { |
194 | /* first pull it out of the global list */ | |
f5c5440d | 195 | hlist_del_rcu(&inst->hlist); |
0597f268 | 196 | |
0597f268 HW |
197 | /* then flush all pending packets from skb */ |
198 | ||
f5c5440d ED |
199 | spin_lock(&inst->lock); |
200 | ||
201 | /* lockless readers wont be able to use us */ | |
202 | inst->copy_mode = NFULNL_COPY_DISABLED; | |
203 | ||
e3567061 MM |
204 | if (inst->skb) |
205 | __nfulnl_flush(inst); | |
f5c5440d | 206 | spin_unlock(&inst->lock); |
0597f268 HW |
207 | |
208 | /* and finally put the refcount */ | |
209 | instance_put(inst); | |
0597f268 HW |
210 | } |
211 | ||
0597f268 HW |
212 | static inline void |
213 | instance_destroy(struct nfulnl_instance *inst) | |
214 | { | |
bed1be20 | 215 | spin_lock_bh(&instances_lock); |
9afdb00c | 216 | __instance_destroy(inst); |
bed1be20 | 217 | spin_unlock_bh(&instances_lock); |
0597f268 HW |
218 | } |
219 | ||
220 | static int | |
221 | nfulnl_set_mode(struct nfulnl_instance *inst, u_int8_t mode, | |
222 | unsigned int range) | |
223 | { | |
224 | int status = 0; | |
225 | ||
226 | spin_lock_bh(&inst->lock); | |
601e68e1 | 227 | |
0597f268 HW |
228 | switch (mode) { |
229 | case NFULNL_COPY_NONE: | |
230 | case NFULNL_COPY_META: | |
231 | inst->copy_mode = mode; | |
232 | inst->copy_range = 0; | |
233 | break; | |
601e68e1 | 234 | |
0597f268 HW |
235 | case NFULNL_COPY_PACKET: |
236 | inst->copy_mode = mode; | |
6b6ec99a MM |
237 | inst->copy_range = min_t(unsigned int, |
238 | range, NFULNL_COPY_RANGE_MAX); | |
0597f268 | 239 | break; |
601e68e1 | 240 | |
0597f268 HW |
241 | default: |
242 | status = -EINVAL; | |
243 | break; | |
244 | } | |
245 | ||
246 | spin_unlock_bh(&inst->lock); | |
247 | ||
248 | return status; | |
249 | } | |
250 | ||
251 | static int | |
252 | nfulnl_set_nlbufsiz(struct nfulnl_instance *inst, u_int32_t nlbufsiz) | |
253 | { | |
254 | int status; | |
255 | ||
256 | spin_lock_bh(&inst->lock); | |
257 | if (nlbufsiz < NFULNL_NLBUFSIZ_DEFAULT) | |
258 | status = -ERANGE; | |
259 | else if (nlbufsiz > 131072) | |
260 | status = -ERANGE; | |
261 | else { | |
262 | inst->nlbufsiz = nlbufsiz; | |
263 | status = 0; | |
264 | } | |
265 | spin_unlock_bh(&inst->lock); | |
266 | ||
267 | return status; | |
268 | } | |
269 | ||
270 | static int | |
271 | nfulnl_set_timeout(struct nfulnl_instance *inst, u_int32_t timeout) | |
272 | { | |
273 | spin_lock_bh(&inst->lock); | |
274 | inst->flushtimeout = timeout; | |
275 | spin_unlock_bh(&inst->lock); | |
276 | ||
277 | return 0; | |
278 | } | |
279 | ||
280 | static int | |
281 | nfulnl_set_qthresh(struct nfulnl_instance *inst, u_int32_t qthresh) | |
282 | { | |
283 | spin_lock_bh(&inst->lock); | |
284 | inst->qthreshold = qthresh; | |
285 | spin_unlock_bh(&inst->lock); | |
286 | ||
287 | return 0; | |
288 | } | |
289 | ||
0af5f6c1 HW |
290 | static int |
291 | nfulnl_set_flags(struct nfulnl_instance *inst, u_int16_t flags) | |
292 | { | |
293 | spin_lock_bh(&inst->lock); | |
ee433530 | 294 | inst->flags = flags; |
0af5f6c1 HW |
295 | spin_unlock_bh(&inst->lock); |
296 | ||
297 | return 0; | |
298 | } | |
299 | ||
c6a8f648 MM |
300 | static struct sk_buff * |
301 | nfulnl_alloc_skb(unsigned int inst_size, unsigned int pkt_size) | |
0597f268 HW |
302 | { |
303 | struct sk_buff *skb; | |
ad2ad0f9 | 304 | unsigned int n; |
0597f268 | 305 | |
0597f268 HW |
306 | /* alloc skb which should be big enough for a whole multipart |
307 | * message. WARNING: has to be <= 128k due to slab restrictions */ | |
308 | ||
ad2ad0f9 PM |
309 | n = max(inst_size, pkt_size); |
310 | skb = alloc_skb(n, GFP_ATOMIC); | |
0597f268 | 311 | if (!skb) { |
ad2ad0f9 PM |
312 | if (n > pkt_size) { |
313 | /* try to allocate only as much as we need for current | |
314 | * packet */ | |
0597f268 | 315 | |
ad2ad0f9 PM |
316 | skb = alloc_skb(pkt_size, GFP_ATOMIC); |
317 | if (!skb) | |
0a9ee813 JP |
318 | pr_err("nfnetlink_log: can't even alloc %u bytes\n", |
319 | pkt_size); | |
ad2ad0f9 | 320 | } |
0597f268 HW |
321 | } |
322 | ||
323 | return skb; | |
324 | } | |
325 | ||
326 | static int | |
327 | __nfulnl_send(struct nfulnl_instance *inst) | |
328 | { | |
29c5d4af | 329 | int status = -1; |
0597f268 | 330 | |
d550d095 DM |
331 | if (inst->qlen > 1) { |
332 | struct nlmsghdr *nlh = nlmsg_put(inst->skb, 0, 0, | |
333 | NLMSG_DONE, | |
334 | sizeof(struct nfgenmsg), | |
335 | 0); | |
336 | if (!nlh) | |
337 | goto out; | |
338 | } | |
cd8c20b6 AD |
339 | status = nfnetlink_unicast(inst->skb, &init_net, inst->peer_pid, |
340 | MSG_DONTWAIT); | |
0597f268 HW |
341 | |
342 | inst->qlen = 0; | |
343 | inst->skb = NULL; | |
d550d095 | 344 | out: |
0597f268 HW |
345 | return status; |
346 | } | |
347 | ||
e3567061 MM |
348 | static void |
349 | __nfulnl_flush(struct nfulnl_instance *inst) | |
350 | { | |
351 | /* timer holds a reference */ | |
352 | if (del_timer(&inst->timer)) | |
353 | instance_put(inst); | |
354 | if (inst->skb) | |
355 | __nfulnl_send(inst); | |
356 | } | |
357 | ||
c6a8f648 MM |
358 | static void |
359 | nfulnl_timer(unsigned long data) | |
0597f268 | 360 | { |
601e68e1 | 361 | struct nfulnl_instance *inst = (struct nfulnl_instance *)data; |
0597f268 | 362 | |
0597f268 | 363 | spin_lock_bh(&inst->lock); |
370e6a87 MM |
364 | if (inst->skb) |
365 | __nfulnl_send(inst); | |
0597f268 | 366 | spin_unlock_bh(&inst->lock); |
05f7b7b3 | 367 | instance_put(inst); |
0597f268 HW |
368 | } |
369 | ||
0af5f6c1 HW |
370 | /* This is an inline function, we don't really care about a long |
371 | * list of arguments */ | |
601e68e1 | 372 | static inline int |
0597f268 | 373 | __build_packet_message(struct nfulnl_instance *inst, |
601e68e1 | 374 | const struct sk_buff *skb, |
0597f268 | 375 | unsigned int data_len, |
76108cea | 376 | u_int8_t pf, |
0597f268 HW |
377 | unsigned int hooknum, |
378 | const struct net_device *indev, | |
379 | const struct net_device *outdev, | |
d7a5c324 | 380 | const char *prefix, unsigned int plen) |
0597f268 | 381 | { |
0597f268 HW |
382 | struct nfulnl_msg_packet_hdr pmsg; |
383 | struct nlmsghdr *nlh; | |
384 | struct nfgenmsg *nfmsg; | |
27a884dc | 385 | sk_buff_data_t old_tail = inst->skb->tail; |
0597f268 | 386 | |
d550d095 | 387 | nlh = nlmsg_put(inst->skb, 0, 0, |
0597f268 | 388 | NFNL_SUBSYS_ULOG << 8 | NFULNL_MSG_PACKET, |
d550d095 DM |
389 | sizeof(struct nfgenmsg), 0); |
390 | if (!nlh) | |
391 | return -1; | |
392 | nfmsg = nlmsg_data(nlh); | |
0597f268 HW |
393 | nfmsg->nfgen_family = pf; |
394 | nfmsg->version = NFNETLINK_V0; | |
395 | nfmsg->res_id = htons(inst->group_num); | |
396 | ||
febf0a43 | 397 | pmsg.hw_protocol = skb->protocol; |
0597f268 HW |
398 | pmsg.hook = hooknum; |
399 | ||
1db20a52 DM |
400 | if (nla_put(inst->skb, NFULA_PACKET_HDR, sizeof(pmsg), &pmsg)) |
401 | goto nla_put_failure; | |
0597f268 | 402 | |
1db20a52 DM |
403 | if (prefix && |
404 | nla_put(inst->skb, NFULA_PREFIX, plen, prefix)) | |
405 | goto nla_put_failure; | |
0597f268 HW |
406 | |
407 | if (indev) { | |
fbcd923c | 408 | #ifndef CONFIG_BRIDGE_NETFILTER |
1db20a52 DM |
409 | if (nla_put_be32(inst->skb, NFULA_IFINDEX_INDEV, |
410 | htonl(indev->ifindex))) | |
411 | goto nla_put_failure; | |
fbcd923c HW |
412 | #else |
413 | if (pf == PF_BRIDGE) { | |
414 | /* Case 1: outdev is physical input device, we need to | |
415 | * look for bridge group (when called from | |
416 | * netfilter_bridge) */ | |
1db20a52 DM |
417 | if (nla_put_be32(inst->skb, NFULA_IFINDEX_PHYSINDEV, |
418 | htonl(indev->ifindex)) || | |
fbcd923c | 419 | /* this is the bridge group "brX" */ |
f350a0a8 | 420 | /* rcu_read_lock()ed by nf_hook_slow or nf_log_packet */ |
1db20a52 DM |
421 | nla_put_be32(inst->skb, NFULA_IFINDEX_INDEV, |
422 | htonl(br_port_get_rcu(indev)->br->dev->ifindex))) | |
423 | goto nla_put_failure; | |
fbcd923c HW |
424 | } else { |
425 | /* Case 2: indev is bridge group, we need to look for | |
426 | * physical device (when called from ipv4) */ | |
1db20a52 DM |
427 | if (nla_put_be32(inst->skb, NFULA_IFINDEX_INDEV, |
428 | htonl(indev->ifindex))) | |
429 | goto nla_put_failure; | |
430 | if (skb->nf_bridge && skb->nf_bridge->physindev && | |
431 | nla_put_be32(inst->skb, NFULA_IFINDEX_PHYSINDEV, | |
432 | htonl(skb->nf_bridge->physindev->ifindex))) | |
433 | goto nla_put_failure; | |
fbcd923c HW |
434 | } |
435 | #endif | |
0597f268 HW |
436 | } |
437 | ||
438 | if (outdev) { | |
fbcd923c | 439 | #ifndef CONFIG_BRIDGE_NETFILTER |
1db20a52 DM |
440 | if (nla_put_be32(inst->skb, NFULA_IFINDEX_OUTDEV, |
441 | htonl(outdev->ifindex))) | |
442 | goto nla_put_failure; | |
fbcd923c HW |
443 | #else |
444 | if (pf == PF_BRIDGE) { | |
445 | /* Case 1: outdev is physical output device, we need to | |
446 | * look for bridge group (when called from | |
447 | * netfilter_bridge) */ | |
1db20a52 DM |
448 | if (nla_put_be32(inst->skb, NFULA_IFINDEX_PHYSOUTDEV, |
449 | htonl(outdev->ifindex)) || | |
fbcd923c | 450 | /* this is the bridge group "brX" */ |
f350a0a8 | 451 | /* rcu_read_lock()ed by nf_hook_slow or nf_log_packet */ |
1db20a52 DM |
452 | nla_put_be32(inst->skb, NFULA_IFINDEX_OUTDEV, |
453 | htonl(br_port_get_rcu(outdev)->br->dev->ifindex))) | |
454 | goto nla_put_failure; | |
fbcd923c HW |
455 | } else { |
456 | /* Case 2: indev is a bridge group, we need to look | |
457 | * for physical device (when called from ipv4) */ | |
1db20a52 DM |
458 | if (nla_put_be32(inst->skb, NFULA_IFINDEX_OUTDEV, |
459 | htonl(outdev->ifindex))) | |
460 | goto nla_put_failure; | |
461 | if (skb->nf_bridge && skb->nf_bridge->physoutdev && | |
462 | nla_put_be32(inst->skb, NFULA_IFINDEX_PHYSOUTDEV, | |
463 | htonl(skb->nf_bridge->physoutdev->ifindex))) | |
464 | goto nla_put_failure; | |
fbcd923c HW |
465 | } |
466 | #endif | |
0597f268 HW |
467 | } |
468 | ||
1db20a52 DM |
469 | if (skb->mark && |
470 | nla_put_be32(inst->skb, NFULA_MARK, htonl(skb->mark))) | |
471 | goto nla_put_failure; | |
0597f268 | 472 | |
2c38de4c NC |
473 | if (indev && skb->dev && |
474 | skb->mac_header != skb->network_header) { | |
0597f268 | 475 | struct nfulnl_msg_packet_hw phw; |
b95cce35 SH |
476 | int len = dev_parse_header(skb, phw.hw_addr); |
477 | if (len > 0) { | |
478 | phw.hw_addrlen = htons(len); | |
1db20a52 DM |
479 | if (nla_put(inst->skb, NFULA_HWADDR, sizeof(phw), &phw)) |
480 | goto nla_put_failure; | |
b95cce35 | 481 | } |
0597f268 HW |
482 | } |
483 | ||
72961ecf | 484 | if (indev && skb_mac_header_was_set(skb)) { |
2dba62c3 | 485 | if (nla_put_be16(inst->skb, NFULA_HWTYPE, htons(skb->dev->type)) || |
1db20a52 DM |
486 | nla_put_be16(inst->skb, NFULA_HWLEN, |
487 | htons(skb->dev->hard_header_len)) || | |
488 | nla_put(inst->skb, NFULA_HWHEADER, skb->dev->hard_header_len, | |
489 | skb_mac_header(skb))) | |
490 | goto nla_put_failure; | |
72961ecf EL |
491 | } |
492 | ||
b7aa0bf7 | 493 | if (skb->tstamp.tv64) { |
0597f268 | 494 | struct nfulnl_msg_packet_timestamp ts; |
b7aa0bf7 ED |
495 | struct timeval tv = ktime_to_timeval(skb->tstamp); |
496 | ts.sec = cpu_to_be64(tv.tv_sec); | |
497 | ts.usec = cpu_to_be64(tv.tv_usec); | |
0597f268 | 498 | |
1db20a52 DM |
499 | if (nla_put(inst->skb, NFULA_TIMESTAMP, sizeof(ts), &ts)) |
500 | goto nla_put_failure; | |
0597f268 HW |
501 | } |
502 | ||
503 | /* UID */ | |
504 | if (skb->sk) { | |
505 | read_lock_bh(&skb->sk->sk_callback_lock); | |
506 | if (skb->sk->sk_socket && skb->sk->sk_socket->file) { | |
d76b0d9b | 507 | struct file *file = skb->sk->sk_socket->file; |
9eea9515 EB |
508 | __be32 uid = htonl(from_kuid_munged(inst->peer_user_ns, |
509 | file->f_cred->fsuid)); | |
510 | __be32 gid = htonl(from_kgid_munged(inst->peer_user_ns, | |
511 | file->f_cred->fsgid)); | |
512 | /* need to unlock here since NLA_PUT may goto */ | |
0597f268 | 513 | read_unlock_bh(&skb->sk->sk_callback_lock); |
1db20a52 DM |
514 | if (nla_put_be32(inst->skb, NFULA_UID, uid) || |
515 | nla_put_be32(inst->skb, NFULA_GID, gid)) | |
516 | goto nla_put_failure; | |
0597f268 HW |
517 | } else |
518 | read_unlock_bh(&skb->sk->sk_callback_lock); | |
519 | } | |
520 | ||
0af5f6c1 | 521 | /* local sequence number */ |
1db20a52 DM |
522 | if ((inst->flags & NFULNL_CFG_F_SEQ) && |
523 | nla_put_be32(inst->skb, NFULA_SEQ, htonl(inst->seq++))) | |
524 | goto nla_put_failure; | |
0dfedd28 | 525 | |
0af5f6c1 | 526 | /* global sequence number */ |
1db20a52 DM |
527 | if ((inst->flags & NFULNL_CFG_F_SEQ_GLOBAL) && |
528 | nla_put_be32(inst->skb, NFULA_SEQ_GLOBAL, | |
529 | htonl(atomic_inc_return(&global_seq)))) | |
530 | goto nla_put_failure; | |
0af5f6c1 | 531 | |
0597f268 | 532 | if (data_len) { |
df6fb868 PM |
533 | struct nlattr *nla; |
534 | int size = nla_attr_size(data_len); | |
0597f268 | 535 | |
df6fb868 | 536 | if (skb_tailroom(inst->skb) < nla_total_size(data_len)) { |
0597f268 | 537 | printk(KERN_WARNING "nfnetlink_log: no tailroom!\n"); |
d550d095 | 538 | return -1; |
0597f268 HW |
539 | } |
540 | ||
df6fb868 PM |
541 | nla = (struct nlattr *)skb_put(inst->skb, nla_total_size(data_len)); |
542 | nla->nla_type = NFULA_PAYLOAD; | |
543 | nla->nla_len = size; | |
0597f268 | 544 | |
df6fb868 | 545 | if (skb_copy_bits(skb, 0, nla_data(nla), data_len)) |
0597f268 HW |
546 | BUG(); |
547 | } | |
601e68e1 | 548 | |
0597f268 HW |
549 | nlh->nlmsg_len = inst->skb->tail - old_tail; |
550 | return 0; | |
551 | ||
df6fb868 | 552 | nla_put_failure: |
0597f268 HW |
553 | PRINTR(KERN_ERR "nfnetlink_log: error creating log nlmsg\n"); |
554 | return -1; | |
555 | } | |
556 | ||
557 | #define RCV_SKB_FAIL(err) do { netlink_ack(skb, nlh, (err)); return; } while (0) | |
558 | ||
559 | static struct nf_loginfo default_loginfo = { | |
560 | .type = NF_LOG_TYPE_ULOG, | |
561 | .u = { | |
562 | .ulog = { | |
563 | .copy_len = 0xffff, | |
564 | .group = 0, | |
565 | .qthreshold = 1, | |
566 | }, | |
567 | }, | |
568 | }; | |
569 | ||
570 | /* log handler for internal netfilter logging api */ | |
5f7340ef | 571 | void |
76108cea | 572 | nfulnl_log_packet(u_int8_t pf, |
0597f268 HW |
573 | unsigned int hooknum, |
574 | const struct sk_buff *skb, | |
575 | const struct net_device *in, | |
576 | const struct net_device *out, | |
577 | const struct nf_loginfo *li_user, | |
578 | const char *prefix) | |
579 | { | |
580 | unsigned int size, data_len; | |
581 | struct nfulnl_instance *inst; | |
582 | const struct nf_loginfo *li; | |
583 | unsigned int qthreshold; | |
d7a5c324 | 584 | unsigned int plen; |
0597f268 | 585 | |
601e68e1 | 586 | if (li_user && li_user->type == NF_LOG_TYPE_ULOG) |
0597f268 HW |
587 | li = li_user; |
588 | else | |
589 | li = &default_loginfo; | |
590 | ||
591 | inst = instance_lookup_get(li->u.ulog.group); | |
592 | if (!inst) | |
0597f268 | 593 | return; |
0597f268 | 594 | |
d7a5c324 PM |
595 | plen = 0; |
596 | if (prefix) | |
881dbfe8 | 597 | plen = strlen(prefix) + 1; |
d7a5c324 | 598 | |
0597f268 HW |
599 | /* FIXME: do we want to make the size calculation conditional based on |
600 | * what is actually present? way more branches and checks, but more | |
601 | * memory efficient... */ | |
7000d38d | 602 | size = NLMSG_SPACE(sizeof(struct nfgenmsg)) |
df6fb868 PM |
603 | + nla_total_size(sizeof(struct nfulnl_msg_packet_hdr)) |
604 | + nla_total_size(sizeof(u_int32_t)) /* ifindex */ | |
605 | + nla_total_size(sizeof(u_int32_t)) /* ifindex */ | |
fbcd923c | 606 | #ifdef CONFIG_BRIDGE_NETFILTER |
df6fb868 PM |
607 | + nla_total_size(sizeof(u_int32_t)) /* ifindex */ |
608 | + nla_total_size(sizeof(u_int32_t)) /* ifindex */ | |
fbcd923c | 609 | #endif |
df6fb868 PM |
610 | + nla_total_size(sizeof(u_int32_t)) /* mark */ |
611 | + nla_total_size(sizeof(u_int32_t)) /* uid */ | |
76aa1ce1 | 612 | + nla_total_size(sizeof(u_int32_t)) /* gid */ |
df6fb868 PM |
613 | + nla_total_size(plen) /* prefix */ |
614 | + nla_total_size(sizeof(struct nfulnl_msg_packet_hw)) | |
615 | + nla_total_size(sizeof(struct nfulnl_msg_packet_timestamp)); | |
0597f268 | 616 | |
eeff9bee PNA |
617 | if (in && skb_mac_header_was_set(skb)) { |
618 | size += nla_total_size(skb->dev->hard_header_len) | |
619 | + nla_total_size(sizeof(u_int16_t)) /* hwtype */ | |
620 | + nla_total_size(sizeof(u_int16_t)); /* hwlen */ | |
621 | } | |
622 | ||
0597f268 HW |
623 | spin_lock_bh(&inst->lock); |
624 | ||
0af5f6c1 | 625 | if (inst->flags & NFULNL_CFG_F_SEQ) |
df6fb868 | 626 | size += nla_total_size(sizeof(u_int32_t)); |
0af5f6c1 | 627 | if (inst->flags & NFULNL_CFG_F_SEQ_GLOBAL) |
df6fb868 | 628 | size += nla_total_size(sizeof(u_int32_t)); |
0af5f6c1 | 629 | |
0597f268 HW |
630 | qthreshold = inst->qthreshold; |
631 | /* per-rule qthreshold overrides per-instance */ | |
5ca431f9 EL |
632 | if (li->u.ulog.qthreshold) |
633 | if (qthreshold > li->u.ulog.qthreshold) | |
634 | qthreshold = li->u.ulog.qthreshold; | |
635 | ||
601e68e1 | 636 | |
0597f268 HW |
637 | switch (inst->copy_mode) { |
638 | case NFULNL_COPY_META: | |
639 | case NFULNL_COPY_NONE: | |
640 | data_len = 0; | |
641 | break; | |
601e68e1 | 642 | |
0597f268 | 643 | case NFULNL_COPY_PACKET: |
601e68e1 | 644 | if (inst->copy_range == 0 |
0597f268 HW |
645 | || inst->copy_range > skb->len) |
646 | data_len = skb->len; | |
647 | else | |
648 | data_len = inst->copy_range; | |
601e68e1 | 649 | |
df6fb868 | 650 | size += nla_total_size(data_len); |
0597f268 | 651 | break; |
601e68e1 | 652 | |
f5c5440d | 653 | case NFULNL_COPY_DISABLED: |
0597f268 | 654 | default: |
55b5a91e | 655 | goto unlock_and_release; |
0597f268 HW |
656 | } |
657 | ||
d63b043d MM |
658 | if (inst->skb && |
659 | size > skb_tailroom(inst->skb) - sizeof(struct nfgenmsg)) { | |
0597f268 HW |
660 | /* either the queue len is too high or we don't have |
661 | * enough room in the skb left. flush to userspace. */ | |
e3567061 | 662 | __nfulnl_flush(inst); |
55b5a91e | 663 | } |
0597f268 | 664 | |
55b5a91e MM |
665 | if (!inst->skb) { |
666 | inst->skb = nfulnl_alloc_skb(inst->nlbufsiz, size); | |
667 | if (!inst->skb) | |
0597f268 | 668 | goto alloc_failure; |
0597f268 HW |
669 | } |
670 | ||
0597f268 HW |
671 | inst->qlen++; |
672 | ||
673 | __build_packet_message(inst, skb, data_len, pf, | |
8248779b | 674 | hooknum, in, out, prefix, plen); |
0597f268 | 675 | |
d63b043d MM |
676 | if (inst->qlen >= qthreshold) |
677 | __nfulnl_flush(inst); | |
0597f268 HW |
678 | /* timer_pending always called within inst->lock, so there |
679 | * is no chance of a race here */ | |
d63b043d | 680 | else if (!timer_pending(&inst->timer)) { |
0597f268 HW |
681 | instance_get(inst); |
682 | inst->timer.expires = jiffies + (inst->flushtimeout*HZ/100); | |
683 | add_timer(&inst->timer); | |
684 | } | |
0597f268 | 685 | |
ed32abea MM |
686 | unlock_and_release: |
687 | spin_unlock_bh(&inst->lock); | |
688 | instance_put(inst); | |
0597f268 HW |
689 | return; |
690 | ||
691 | alloc_failure: | |
0597f268 | 692 | /* FIXME: statistics */ |
ed32abea | 693 | goto unlock_and_release; |
0597f268 | 694 | } |
5f7340ef | 695 | EXPORT_SYMBOL_GPL(nfulnl_log_packet); |
0597f268 HW |
696 | |
697 | static int | |
698 | nfulnl_rcv_nl_event(struct notifier_block *this, | |
699 | unsigned long event, void *ptr) | |
700 | { | |
701 | struct netlink_notify *n = ptr; | |
702 | ||
dee5817e | 703 | if (event == NETLINK_URELEASE && n->protocol == NETLINK_NETFILTER) { |
0597f268 HW |
704 | int i; |
705 | ||
706 | /* destroy all instances for this pid */ | |
bed1be20 | 707 | spin_lock_bh(&instances_lock); |
0597f268 HW |
708 | for (i = 0; i < INSTANCE_BUCKETS; i++) { |
709 | struct hlist_node *tmp, *t2; | |
710 | struct nfulnl_instance *inst; | |
711 | struct hlist_head *head = &instance_table[i]; | |
712 | ||
713 | hlist_for_each_entry_safe(inst, tmp, t2, head, hlist) { | |
09ad9bc7 | 714 | if ((net_eq(n->net, &init_net)) && |
b4b51029 | 715 | (n->pid == inst->peer_pid)) |
0597f268 HW |
716 | __instance_destroy(inst); |
717 | } | |
718 | } | |
bed1be20 | 719 | spin_unlock_bh(&instances_lock); |
0597f268 HW |
720 | } |
721 | return NOTIFY_DONE; | |
722 | } | |
723 | ||
724 | static struct notifier_block nfulnl_rtnl_notifier = { | |
725 | .notifier_call = nfulnl_rcv_nl_event, | |
726 | }; | |
727 | ||
728 | static int | |
729 | nfulnl_recv_unsupp(struct sock *ctnl, struct sk_buff *skb, | |
39938324 PM |
730 | const struct nlmsghdr *nlh, |
731 | const struct nlattr * const nfqa[]) | |
0597f268 HW |
732 | { |
733 | return -ENOTSUPP; | |
734 | } | |
735 | ||
ca735b3a | 736 | static struct nf_logger nfulnl_logger __read_mostly = { |
0597f268 HW |
737 | .name = "nfnetlink_log", |
738 | .logfn = &nfulnl_log_packet, | |
739 | .me = THIS_MODULE, | |
740 | }; | |
741 | ||
fd8281ad PM |
742 | static const struct nla_policy nfula_cfg_policy[NFULA_CFG_MAX+1] = { |
743 | [NFULA_CFG_CMD] = { .len = sizeof(struct nfulnl_msg_config_cmd) }, | |
744 | [NFULA_CFG_MODE] = { .len = sizeof(struct nfulnl_msg_config_mode) }, | |
745 | [NFULA_CFG_TIMEOUT] = { .type = NLA_U32 }, | |
746 | [NFULA_CFG_QTHRESH] = { .type = NLA_U32 }, | |
747 | [NFULA_CFG_NLBUFSIZ] = { .type = NLA_U32 }, | |
748 | [NFULA_CFG_FLAGS] = { .type = NLA_U16 }, | |
0597f268 HW |
749 | }; |
750 | ||
751 | static int | |
752 | nfulnl_recv_config(struct sock *ctnl, struct sk_buff *skb, | |
39938324 PM |
753 | const struct nlmsghdr *nlh, |
754 | const struct nlattr * const nfula[]) | |
0597f268 | 755 | { |
d550d095 | 756 | struct nfgenmsg *nfmsg = nlmsg_data(nlh); |
0597f268 HW |
757 | u_int16_t group_num = ntohs(nfmsg->res_id); |
758 | struct nfulnl_instance *inst; | |
b7047a1c | 759 | struct nfulnl_msg_config_cmd *cmd = NULL; |
0597f268 HW |
760 | int ret = 0; |
761 | ||
b7047a1c PM |
762 | if (nfula[NFULA_CFG_CMD]) { |
763 | u_int8_t pf = nfmsg->nfgen_family; | |
764 | cmd = nla_data(nfula[NFULA_CFG_CMD]); | |
765 | ||
766 | /* Commands without queue context */ | |
767 | switch (cmd->command) { | |
768 | case NFULNL_CFG_CMD_PF_BIND: | |
ca735b3a | 769 | return nf_log_bind_pf(pf, &nfulnl_logger); |
b7047a1c | 770 | case NFULNL_CFG_CMD_PF_UNBIND: |
ca735b3a | 771 | nf_log_unbind_pf(pf); |
b7047a1c PM |
772 | return 0; |
773 | } | |
774 | } | |
775 | ||
0597f268 | 776 | inst = instance_lookup_get(group_num); |
c0506365 PM |
777 | if (inst && inst->peer_pid != NETLINK_CB(skb).pid) { |
778 | ret = -EPERM; | |
779 | goto out_put; | |
780 | } | |
781 | ||
b7047a1c | 782 | if (cmd != NULL) { |
0597f268 HW |
783 | switch (cmd->command) { |
784 | case NFULNL_CFG_CMD_BIND: | |
785 | if (inst) { | |
786 | ret = -EBUSY; | |
787 | goto out_put; | |
788 | } | |
789 | ||
790 | inst = instance_create(group_num, | |
9eea9515 EB |
791 | NETLINK_CB(skb).pid, |
792 | sk_user_ns(NETLINK_CB(skb).ssk)); | |
baab2ce7 PM |
793 | if (IS_ERR(inst)) { |
794 | ret = PTR_ERR(inst); | |
f414c16c | 795 | goto out; |
0597f268 HW |
796 | } |
797 | break; | |
798 | case NFULNL_CFG_CMD_UNBIND: | |
799 | if (!inst) { | |
800 | ret = -ENODEV; | |
f414c16c | 801 | goto out; |
0597f268 HW |
802 | } |
803 | ||
0597f268 | 804 | instance_destroy(inst); |
a49c6503 | 805 | goto out_put; |
0597f268 | 806 | default: |
cd21f0ac | 807 | ret = -ENOTSUPP; |
0597f268 HW |
808 | break; |
809 | } | |
0597f268 HW |
810 | } |
811 | ||
df6fb868 | 812 | if (nfula[NFULA_CFG_MODE]) { |
0597f268 | 813 | struct nfulnl_msg_config_mode *params; |
df6fb868 | 814 | params = nla_data(nfula[NFULA_CFG_MODE]); |
0597f268 | 815 | |
c0506365 PM |
816 | if (!inst) { |
817 | ret = -ENODEV; | |
818 | goto out; | |
819 | } | |
0597f268 | 820 | nfulnl_set_mode(inst, params->copy_mode, |
d1208b99 | 821 | ntohl(params->copy_range)); |
0597f268 HW |
822 | } |
823 | ||
df6fb868 | 824 | if (nfula[NFULA_CFG_TIMEOUT]) { |
0dfedd28 | 825 | __be32 timeout = nla_get_be32(nfula[NFULA_CFG_TIMEOUT]); |
0597f268 | 826 | |
c0506365 PM |
827 | if (!inst) { |
828 | ret = -ENODEV; | |
829 | goto out; | |
830 | } | |
0597f268 HW |
831 | nfulnl_set_timeout(inst, ntohl(timeout)); |
832 | } | |
833 | ||
df6fb868 | 834 | if (nfula[NFULA_CFG_NLBUFSIZ]) { |
0dfedd28 | 835 | __be32 nlbufsiz = nla_get_be32(nfula[NFULA_CFG_NLBUFSIZ]); |
0597f268 | 836 | |
c0506365 PM |
837 | if (!inst) { |
838 | ret = -ENODEV; | |
839 | goto out; | |
840 | } | |
0597f268 HW |
841 | nfulnl_set_nlbufsiz(inst, ntohl(nlbufsiz)); |
842 | } | |
843 | ||
df6fb868 | 844 | if (nfula[NFULA_CFG_QTHRESH]) { |
0dfedd28 | 845 | __be32 qthresh = nla_get_be32(nfula[NFULA_CFG_QTHRESH]); |
0597f268 | 846 | |
c0506365 PM |
847 | if (!inst) { |
848 | ret = -ENODEV; | |
849 | goto out; | |
850 | } | |
0597f268 HW |
851 | nfulnl_set_qthresh(inst, ntohl(qthresh)); |
852 | } | |
853 | ||
df6fb868 | 854 | if (nfula[NFULA_CFG_FLAGS]) { |
0dfedd28 | 855 | __be16 flags = nla_get_be16(nfula[NFULA_CFG_FLAGS]); |
c0506365 PM |
856 | |
857 | if (!inst) { | |
858 | ret = -ENODEV; | |
859 | goto out; | |
860 | } | |
ee433530 | 861 | nfulnl_set_flags(inst, ntohs(flags)); |
0af5f6c1 HW |
862 | } |
863 | ||
0597f268 HW |
864 | out_put: |
865 | instance_put(inst); | |
dd16704e | 866 | out: |
0597f268 HW |
867 | return ret; |
868 | } | |
869 | ||
7c8d4cb4 | 870 | static const struct nfnl_callback nfulnl_cb[NFULNL_MSG_MAX] = { |
0597f268 | 871 | [NFULNL_MSG_PACKET] = { .call = nfulnl_recv_unsupp, |
37d2e7a2 | 872 | .attr_count = NFULA_MAX, }, |
0597f268 | 873 | [NFULNL_MSG_CONFIG] = { .call = nfulnl_recv_config, |
fd8281ad PM |
874 | .attr_count = NFULA_CFG_MAX, |
875 | .policy = nfula_cfg_policy }, | |
0597f268 HW |
876 | }; |
877 | ||
7c8d4cb4 | 878 | static const struct nfnetlink_subsystem nfulnl_subsys = { |
0597f268 HW |
879 | .name = "log", |
880 | .subsys_id = NFNL_SUBSYS_ULOG, | |
881 | .cb_count = NFULNL_MSG_MAX, | |
0597f268 HW |
882 | .cb = nfulnl_cb, |
883 | }; | |
884 | ||
885 | #ifdef CONFIG_PROC_FS | |
886 | struct iter_state { | |
887 | unsigned int bucket; | |
888 | }; | |
889 | ||
f76cdcee | 890 | static struct hlist_node *get_first(struct iter_state *st) |
0597f268 | 891 | { |
0597f268 HW |
892 | if (!st) |
893 | return NULL; | |
894 | ||
895 | for (st->bucket = 0; st->bucket < INSTANCE_BUCKETS; st->bucket++) { | |
896 | if (!hlist_empty(&instance_table[st->bucket])) | |
0e60ebe0 | 897 | return rcu_dereference_bh(hlist_first_rcu(&instance_table[st->bucket])); |
0597f268 HW |
898 | } |
899 | return NULL; | |
900 | } | |
901 | ||
f76cdcee | 902 | static struct hlist_node *get_next(struct iter_state *st, struct hlist_node *h) |
0597f268 | 903 | { |
0e60ebe0 | 904 | h = rcu_dereference_bh(hlist_next_rcu(h)); |
0597f268 HW |
905 | while (!h) { |
906 | if (++st->bucket >= INSTANCE_BUCKETS) | |
907 | return NULL; | |
908 | ||
0e60ebe0 | 909 | h = rcu_dereference_bh(hlist_first_rcu(&instance_table[st->bucket])); |
0597f268 HW |
910 | } |
911 | return h; | |
912 | } | |
913 | ||
f76cdcee | 914 | static struct hlist_node *get_idx(struct iter_state *st, loff_t pos) |
0597f268 HW |
915 | { |
916 | struct hlist_node *head; | |
f76cdcee | 917 | head = get_first(st); |
0597f268 HW |
918 | |
919 | if (head) | |
f76cdcee | 920 | while (pos && (head = get_next(st, head))) |
0597f268 HW |
921 | pos--; |
922 | return pos ? NULL : head; | |
923 | } | |
924 | ||
925 | static void *seq_start(struct seq_file *seq, loff_t *pos) | |
bed1be20 | 926 | __acquires(rcu_bh) |
0597f268 | 927 | { |
bed1be20 | 928 | rcu_read_lock_bh(); |
f76cdcee | 929 | return get_idx(seq->private, *pos); |
0597f268 HW |
930 | } |
931 | ||
932 | static void *seq_next(struct seq_file *s, void *v, loff_t *pos) | |
933 | { | |
934 | (*pos)++; | |
f76cdcee | 935 | return get_next(s->private, v); |
0597f268 HW |
936 | } |
937 | ||
938 | static void seq_stop(struct seq_file *s, void *v) | |
bed1be20 | 939 | __releases(rcu_bh) |
0597f268 | 940 | { |
bed1be20 | 941 | rcu_read_unlock_bh(); |
0597f268 HW |
942 | } |
943 | ||
944 | static int seq_show(struct seq_file *s, void *v) | |
945 | { | |
946 | const struct nfulnl_instance *inst = v; | |
947 | ||
601e68e1 | 948 | return seq_printf(s, "%5d %6d %5d %1d %5d %6d %2d\n", |
0597f268 | 949 | inst->group_num, |
601e68e1 | 950 | inst->peer_pid, inst->qlen, |
0597f268 HW |
951 | inst->copy_mode, inst->copy_range, |
952 | inst->flushtimeout, atomic_read(&inst->use)); | |
953 | } | |
954 | ||
56b3d975 | 955 | static const struct seq_operations nful_seq_ops = { |
0597f268 HW |
956 | .start = seq_start, |
957 | .next = seq_next, | |
958 | .stop = seq_stop, | |
959 | .show = seq_show, | |
960 | }; | |
961 | ||
962 | static int nful_open(struct inode *inode, struct file *file) | |
963 | { | |
e2da5913 PE |
964 | return seq_open_private(file, &nful_seq_ops, |
965 | sizeof(struct iter_state)); | |
0597f268 HW |
966 | } |
967 | ||
da7071d7 | 968 | static const struct file_operations nful_file_ops = { |
0597f268 HW |
969 | .owner = THIS_MODULE, |
970 | .open = nful_open, | |
971 | .read = seq_read, | |
972 | .llseek = seq_lseek, | |
973 | .release = seq_release_private, | |
974 | }; | |
975 | ||
976 | #endif /* PROC_FS */ | |
977 | ||
32292a7f | 978 | static int __init nfnetlink_log_init(void) |
0597f268 HW |
979 | { |
980 | int i, status = -ENOMEM; | |
601e68e1 | 981 | |
0597f268 HW |
982 | for (i = 0; i < INSTANCE_BUCKETS; i++) |
983 | INIT_HLIST_HEAD(&instance_table[i]); | |
601e68e1 | 984 | |
0597f268 HW |
985 | /* it's not really all that important to have a random value, so |
986 | * we can do this from the init function, even if there hasn't | |
987 | * been that much entropy yet */ | |
988 | get_random_bytes(&hash_init, sizeof(hash_init)); | |
989 | ||
990 | netlink_register_notifier(&nfulnl_rtnl_notifier); | |
991 | status = nfnetlink_subsys_register(&nfulnl_subsys); | |
992 | if (status < 0) { | |
993 | printk(KERN_ERR "log: failed to create netlink socket\n"); | |
994 | goto cleanup_netlink_notifier; | |
995 | } | |
996 | ||
ca735b3a EL |
997 | status = nf_log_register(NFPROTO_UNSPEC, &nfulnl_logger); |
998 | if (status < 0) { | |
999 | printk(KERN_ERR "log: failed to register logger\n"); | |
1000 | goto cleanup_subsys; | |
1001 | } | |
1002 | ||
0597f268 | 1003 | #ifdef CONFIG_PROC_FS |
8eeee8b1 | 1004 | if (!proc_create("nfnetlink_log", 0440, |
6fc09f10 JL |
1005 | proc_net_netfilter, &nful_file_ops)) { |
1006 | status = -ENOMEM; | |
ca735b3a | 1007 | goto cleanup_logger; |
6fc09f10 | 1008 | } |
0597f268 | 1009 | #endif |
0597f268 HW |
1010 | return status; |
1011 | ||
0597f268 | 1012 | #ifdef CONFIG_PROC_FS |
ca735b3a EL |
1013 | cleanup_logger: |
1014 | nf_log_unregister(&nfulnl_logger); | |
1015 | #endif | |
0597f268 | 1016 | cleanup_subsys: |
0597f268 HW |
1017 | nfnetlink_subsys_unregister(&nfulnl_subsys); |
1018 | cleanup_netlink_notifier: | |
1019 | netlink_unregister_notifier(&nfulnl_rtnl_notifier); | |
1020 | return status; | |
1021 | } | |
1022 | ||
65b4b4e8 | 1023 | static void __exit nfnetlink_log_fini(void) |
0597f268 | 1024 | { |
e92ad99c | 1025 | nf_log_unregister(&nfulnl_logger); |
32292a7f PM |
1026 | #ifdef CONFIG_PROC_FS |
1027 | remove_proc_entry("nfnetlink_log", proc_net_netfilter); | |
1028 | #endif | |
1029 | nfnetlink_subsys_unregister(&nfulnl_subsys); | |
1030 | netlink_unregister_notifier(&nfulnl_rtnl_notifier); | |
0597f268 HW |
1031 | } |
1032 | ||
1033 | MODULE_DESCRIPTION("netfilter userspace logging"); | |
1034 | MODULE_AUTHOR("Harald Welte <laforge@netfilter.org>"); | |
1035 | MODULE_LICENSE("GPL"); | |
f682faef | 1036 | MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_ULOG); |
0597f268 | 1037 | |
65b4b4e8 AM |
1038 | module_init(nfnetlink_log_init); |
1039 | module_exit(nfnetlink_log_fini); |