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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. | |
13 | * | |
0af5f6c1 HW |
14 | * 2006-01-26 Harald Welte <laforge@netfilter.org> |
15 | * - Add optional local and global sequence number to detect lost | |
16 | * events from userspace | |
17 | * | |
0597f268 HW |
18 | */ |
19 | #include <linux/module.h> | |
20 | #include <linux/skbuff.h> | |
21 | #include <linux/init.h> | |
22 | #include <linux/ip.h> | |
23 | #include <linux/ipv6.h> | |
24 | #include <linux/netdevice.h> | |
25 | #include <linux/netfilter.h> | |
26 | #include <linux/netlink.h> | |
27 | #include <linux/netfilter/nfnetlink.h> | |
28 | #include <linux/netfilter/nfnetlink_log.h> | |
29 | #include <linux/spinlock.h> | |
30 | #include <linux/sysctl.h> | |
31 | #include <linux/proc_fs.h> | |
32 | #include <linux/security.h> | |
33 | #include <linux/list.h> | |
34 | #include <linux/jhash.h> | |
35 | #include <linux/random.h> | |
36 | #include <net/sock.h> | |
37 | ||
38 | #include <asm/atomic.h> | |
39 | ||
fbcd923c HW |
40 | #ifdef CONFIG_BRIDGE_NETFILTER |
41 | #include "../bridge/br_private.h" | |
42 | #endif | |
43 | ||
c2db2924 | 44 | #define NFULNL_NLBUFSIZ_DEFAULT NLMSG_GOODSIZE |
0597f268 HW |
45 | #define NFULNL_TIMEOUT_DEFAULT 100 /* every second */ |
46 | #define NFULNL_QTHRESH_DEFAULT 100 /* 100 packets */ | |
47 | ||
48 | #define PRINTR(x, args...) do { if (net_ratelimit()) \ | |
49 | printk(x, ## args); } while (0); | |
50 | ||
51 | #if 0 | |
52 | #define UDEBUG(x, args ...) printk(KERN_DEBUG "%s(%d):%s(): " x, \ | |
53 | __FILE__, __LINE__, __FUNCTION__, \ | |
54 | ## args) | |
55 | #else | |
56 | #define UDEBUG(x, ...) | |
57 | #endif | |
58 | ||
59 | struct nfulnl_instance { | |
60 | struct hlist_node hlist; /* global list of instances */ | |
61 | spinlock_t lock; | |
62 | atomic_t use; /* use count */ | |
63 | ||
64 | unsigned int qlen; /* number of nlmsgs in skb */ | |
65 | struct sk_buff *skb; /* pre-allocatd skb */ | |
66 | struct nlmsghdr *lastnlh; /* netlink header of last msg in skb */ | |
67 | struct timer_list timer; | |
68 | int peer_pid; /* PID of the peer process */ | |
69 | ||
70 | /* configurable parameters */ | |
71 | unsigned int flushtimeout; /* timeout until queue flush */ | |
72 | unsigned int nlbufsiz; /* netlink buffer allocation size */ | |
73 | unsigned int qthreshold; /* threshold of the queue */ | |
74 | u_int32_t copy_range; | |
0af5f6c1 | 75 | u_int32_t seq; /* instance-local sequential counter */ |
0597f268 | 76 | u_int16_t group_num; /* number of this queue */ |
0af5f6c1 | 77 | u_int16_t flags; |
601e68e1 | 78 | u_int8_t copy_mode; |
0597f268 HW |
79 | }; |
80 | ||
81 | static DEFINE_RWLOCK(instances_lock); | |
0af5f6c1 | 82 | static atomic_t global_seq; |
0597f268 HW |
83 | |
84 | #define INSTANCE_BUCKETS 16 | |
85 | static struct hlist_head instance_table[INSTANCE_BUCKETS]; | |
86 | static unsigned int hash_init; | |
87 | ||
88 | static inline u_int8_t instance_hashfn(u_int16_t group_num) | |
89 | { | |
90 | return ((group_num & 0xff) % INSTANCE_BUCKETS); | |
91 | } | |
92 | ||
93 | static struct nfulnl_instance * | |
94 | __instance_lookup(u_int16_t group_num) | |
95 | { | |
96 | struct hlist_head *head; | |
97 | struct hlist_node *pos; | |
98 | struct nfulnl_instance *inst; | |
99 | ||
100 | UDEBUG("entering (group_num=%u)\n", group_num); | |
101 | ||
102 | head = &instance_table[instance_hashfn(group_num)]; | |
103 | hlist_for_each_entry(inst, pos, head, hlist) { | |
104 | if (inst->group_num == group_num) | |
105 | return inst; | |
106 | } | |
107 | return NULL; | |
108 | } | |
109 | ||
110 | static inline void | |
111 | instance_get(struct nfulnl_instance *inst) | |
112 | { | |
113 | atomic_inc(&inst->use); | |
114 | } | |
115 | ||
116 | static struct nfulnl_instance * | |
117 | instance_lookup_get(u_int16_t group_num) | |
118 | { | |
119 | struct nfulnl_instance *inst; | |
120 | ||
121 | read_lock_bh(&instances_lock); | |
122 | inst = __instance_lookup(group_num); | |
123 | if (inst) | |
124 | instance_get(inst); | |
125 | read_unlock_bh(&instances_lock); | |
126 | ||
127 | return inst; | |
128 | } | |
129 | ||
130 | static void | |
131 | instance_put(struct nfulnl_instance *inst) | |
132 | { | |
133 | if (inst && atomic_dec_and_test(&inst->use)) { | |
134 | UDEBUG("kfree(inst=%p)\n", inst); | |
135 | kfree(inst); | |
7d90e86d | 136 | module_put(THIS_MODULE); |
0597f268 HW |
137 | } |
138 | } | |
139 | ||
140 | static void nfulnl_timer(unsigned long data); | |
141 | ||
142 | static struct nfulnl_instance * | |
143 | instance_create(u_int16_t group_num, int pid) | |
144 | { | |
145 | struct nfulnl_instance *inst; | |
146 | ||
147 | UDEBUG("entering (group_num=%u, pid=%d)\n", group_num, | |
148 | pid); | |
149 | ||
601e68e1 | 150 | write_lock_bh(&instances_lock); |
0597f268 HW |
151 | if (__instance_lookup(group_num)) { |
152 | inst = NULL; | |
153 | UDEBUG("aborting, instance already exists\n"); | |
154 | goto out_unlock; | |
155 | } | |
156 | ||
10dfdc69 | 157 | inst = kzalloc(sizeof(*inst), GFP_ATOMIC); |
0597f268 HW |
158 | if (!inst) |
159 | goto out_unlock; | |
160 | ||
0597f268 | 161 | INIT_HLIST_NODE(&inst->hlist); |
181a46a5 | 162 | spin_lock_init(&inst->lock); |
0597f268 HW |
163 | /* needs to be two, since we _put() after creation */ |
164 | atomic_set(&inst->use, 2); | |
165 | ||
166 | init_timer(&inst->timer); | |
167 | inst->timer.function = nfulnl_timer; | |
168 | inst->timer.data = (unsigned long)inst; | |
169 | /* don't start timer yet. (re)start it with every packet */ | |
170 | ||
171 | inst->peer_pid = pid; | |
172 | inst->group_num = group_num; | |
173 | ||
174 | inst->qthreshold = NFULNL_QTHRESH_DEFAULT; | |
175 | inst->flushtimeout = NFULNL_TIMEOUT_DEFAULT; | |
176 | inst->nlbufsiz = NFULNL_NLBUFSIZ_DEFAULT; | |
177 | inst->copy_mode = NFULNL_COPY_PACKET; | |
178 | inst->copy_range = 0xffff; | |
179 | ||
180 | if (!try_module_get(THIS_MODULE)) | |
181 | goto out_free; | |
182 | ||
601e68e1 | 183 | hlist_add_head(&inst->hlist, |
0597f268 HW |
184 | &instance_table[instance_hashfn(group_num)]); |
185 | ||
601e68e1 | 186 | UDEBUG("newly added node: %p, next=%p\n", &inst->hlist, |
0597f268 HW |
187 | inst->hlist.next); |
188 | ||
189 | write_unlock_bh(&instances_lock); | |
190 | ||
191 | return inst; | |
192 | ||
193 | out_free: | |
194 | instance_put(inst); | |
195 | out_unlock: | |
196 | write_unlock_bh(&instances_lock); | |
197 | return NULL; | |
198 | } | |
199 | ||
200 | static int __nfulnl_send(struct nfulnl_instance *inst); | |
201 | ||
202 | static void | |
203 | _instance_destroy2(struct nfulnl_instance *inst, int lock) | |
204 | { | |
205 | /* first pull it out of the global list */ | |
206 | if (lock) | |
207 | write_lock_bh(&instances_lock); | |
208 | ||
209 | UDEBUG("removing instance %p (queuenum=%u) from hash\n", | |
210 | inst, inst->group_num); | |
211 | ||
212 | hlist_del(&inst->hlist); | |
213 | ||
214 | if (lock) | |
215 | write_unlock_bh(&instances_lock); | |
216 | ||
217 | /* then flush all pending packets from skb */ | |
218 | ||
219 | spin_lock_bh(&inst->lock); | |
220 | if (inst->skb) { | |
b4d6202b MM |
221 | /* timer "holds" one reference (we have one more) */ |
222 | if (del_timer(&inst->timer)) | |
223 | instance_put(inst); | |
0597f268 HW |
224 | if (inst->qlen) |
225 | __nfulnl_send(inst); | |
226 | if (inst->skb) { | |
227 | kfree_skb(inst->skb); | |
228 | inst->skb = NULL; | |
229 | } | |
230 | } | |
231 | spin_unlock_bh(&inst->lock); | |
232 | ||
233 | /* and finally put the refcount */ | |
234 | instance_put(inst); | |
0597f268 HW |
235 | } |
236 | ||
237 | static inline void | |
238 | __instance_destroy(struct nfulnl_instance *inst) | |
239 | { | |
240 | _instance_destroy2(inst, 0); | |
241 | } | |
242 | ||
243 | static inline void | |
244 | instance_destroy(struct nfulnl_instance *inst) | |
245 | { | |
246 | _instance_destroy2(inst, 1); | |
247 | } | |
248 | ||
249 | static int | |
250 | nfulnl_set_mode(struct nfulnl_instance *inst, u_int8_t mode, | |
251 | unsigned int range) | |
252 | { | |
253 | int status = 0; | |
254 | ||
255 | spin_lock_bh(&inst->lock); | |
601e68e1 | 256 | |
0597f268 HW |
257 | switch (mode) { |
258 | case NFULNL_COPY_NONE: | |
259 | case NFULNL_COPY_META: | |
260 | inst->copy_mode = mode; | |
261 | inst->copy_range = 0; | |
262 | break; | |
601e68e1 | 263 | |
0597f268 HW |
264 | case NFULNL_COPY_PACKET: |
265 | inst->copy_mode = mode; | |
266 | /* we're using struct nfattr which has 16bit nfa_len */ | |
267 | if (range > 0xffff) | |
268 | inst->copy_range = 0xffff; | |
269 | else | |
270 | inst->copy_range = range; | |
271 | break; | |
601e68e1 | 272 | |
0597f268 HW |
273 | default: |
274 | status = -EINVAL; | |
275 | break; | |
276 | } | |
277 | ||
278 | spin_unlock_bh(&inst->lock); | |
279 | ||
280 | return status; | |
281 | } | |
282 | ||
283 | static int | |
284 | nfulnl_set_nlbufsiz(struct nfulnl_instance *inst, u_int32_t nlbufsiz) | |
285 | { | |
286 | int status; | |
287 | ||
288 | spin_lock_bh(&inst->lock); | |
289 | if (nlbufsiz < NFULNL_NLBUFSIZ_DEFAULT) | |
290 | status = -ERANGE; | |
291 | else if (nlbufsiz > 131072) | |
292 | status = -ERANGE; | |
293 | else { | |
294 | inst->nlbufsiz = nlbufsiz; | |
295 | status = 0; | |
296 | } | |
297 | spin_unlock_bh(&inst->lock); | |
298 | ||
299 | return status; | |
300 | } | |
301 | ||
302 | static int | |
303 | nfulnl_set_timeout(struct nfulnl_instance *inst, u_int32_t timeout) | |
304 | { | |
305 | spin_lock_bh(&inst->lock); | |
306 | inst->flushtimeout = timeout; | |
307 | spin_unlock_bh(&inst->lock); | |
308 | ||
309 | return 0; | |
310 | } | |
311 | ||
312 | static int | |
313 | nfulnl_set_qthresh(struct nfulnl_instance *inst, u_int32_t qthresh) | |
314 | { | |
315 | spin_lock_bh(&inst->lock); | |
316 | inst->qthreshold = qthresh; | |
317 | spin_unlock_bh(&inst->lock); | |
318 | ||
319 | return 0; | |
320 | } | |
321 | ||
0af5f6c1 HW |
322 | static int |
323 | nfulnl_set_flags(struct nfulnl_instance *inst, u_int16_t flags) | |
324 | { | |
325 | spin_lock_bh(&inst->lock); | |
ee433530 | 326 | inst->flags = flags; |
0af5f6c1 HW |
327 | spin_unlock_bh(&inst->lock); |
328 | ||
329 | return 0; | |
330 | } | |
331 | ||
601e68e1 | 332 | static struct sk_buff *nfulnl_alloc_skb(unsigned int inst_size, |
0597f268 HW |
333 | unsigned int pkt_size) |
334 | { | |
335 | struct sk_buff *skb; | |
ad2ad0f9 | 336 | unsigned int n; |
0597f268 HW |
337 | |
338 | UDEBUG("entered (%u, %u)\n", inst_size, pkt_size); | |
339 | ||
340 | /* alloc skb which should be big enough for a whole multipart | |
341 | * message. WARNING: has to be <= 128k due to slab restrictions */ | |
342 | ||
ad2ad0f9 PM |
343 | n = max(inst_size, pkt_size); |
344 | skb = alloc_skb(n, GFP_ATOMIC); | |
0597f268 HW |
345 | if (!skb) { |
346 | PRINTR("nfnetlink_log: can't alloc whole buffer (%u bytes)\n", | |
347 | inst_size); | |
348 | ||
ad2ad0f9 PM |
349 | if (n > pkt_size) { |
350 | /* try to allocate only as much as we need for current | |
351 | * packet */ | |
0597f268 | 352 | |
ad2ad0f9 PM |
353 | skb = alloc_skb(pkt_size, GFP_ATOMIC); |
354 | if (!skb) | |
355 | PRINTR("nfnetlink_log: can't even alloc %u " | |
356 | "bytes\n", pkt_size); | |
357 | } | |
0597f268 HW |
358 | } |
359 | ||
360 | return skb; | |
361 | } | |
362 | ||
363 | static int | |
364 | __nfulnl_send(struct nfulnl_instance *inst) | |
365 | { | |
366 | int status; | |
367 | ||
dcb7cd97 MH |
368 | if (!inst->skb) |
369 | return 0; | |
370 | ||
0597f268 HW |
371 | if (inst->qlen > 1) |
372 | inst->lastnlh->nlmsg_type = NLMSG_DONE; | |
373 | ||
374 | status = nfnetlink_unicast(inst->skb, inst->peer_pid, MSG_DONTWAIT); | |
375 | if (status < 0) { | |
376 | UDEBUG("netlink_unicast() failed\n"); | |
377 | /* FIXME: statistics */ | |
378 | } | |
379 | ||
380 | inst->qlen = 0; | |
381 | inst->skb = NULL; | |
382 | inst->lastnlh = NULL; | |
383 | ||
384 | return status; | |
385 | } | |
386 | ||
387 | static void nfulnl_timer(unsigned long data) | |
388 | { | |
601e68e1 | 389 | struct nfulnl_instance *inst = (struct nfulnl_instance *)data; |
0597f268 HW |
390 | |
391 | UDEBUG("timer function called, flushing buffer\n"); | |
392 | ||
393 | spin_lock_bh(&inst->lock); | |
394 | __nfulnl_send(inst); | |
0597f268 | 395 | spin_unlock_bh(&inst->lock); |
05f7b7b3 | 396 | instance_put(inst); |
0597f268 HW |
397 | } |
398 | ||
0af5f6c1 HW |
399 | /* This is an inline function, we don't really care about a long |
400 | * list of arguments */ | |
601e68e1 | 401 | static inline int |
0597f268 | 402 | __build_packet_message(struct nfulnl_instance *inst, |
601e68e1 | 403 | const struct sk_buff *skb, |
0597f268 HW |
404 | unsigned int data_len, |
405 | unsigned int pf, | |
406 | unsigned int hooknum, | |
407 | const struct net_device *indev, | |
408 | const struct net_device *outdev, | |
409 | const struct nf_loginfo *li, | |
d7a5c324 | 410 | const char *prefix, unsigned int plen) |
0597f268 HW |
411 | { |
412 | unsigned char *old_tail; | |
413 | struct nfulnl_msg_packet_hdr pmsg; | |
414 | struct nlmsghdr *nlh; | |
415 | struct nfgenmsg *nfmsg; | |
98a4a861 | 416 | __be32 tmp_uint; |
0597f268 HW |
417 | |
418 | UDEBUG("entered\n"); | |
601e68e1 | 419 | |
0597f268 | 420 | old_tail = inst->skb->tail; |
601e68e1 | 421 | nlh = NLMSG_PUT(inst->skb, 0, 0, |
0597f268 HW |
422 | NFNL_SUBSYS_ULOG << 8 | NFULNL_MSG_PACKET, |
423 | sizeof(struct nfgenmsg)); | |
424 | nfmsg = NLMSG_DATA(nlh); | |
425 | nfmsg->nfgen_family = pf; | |
426 | nfmsg->version = NFNETLINK_V0; | |
427 | nfmsg->res_id = htons(inst->group_num); | |
428 | ||
febf0a43 | 429 | pmsg.hw_protocol = skb->protocol; |
0597f268 HW |
430 | pmsg.hook = hooknum; |
431 | ||
432 | NFA_PUT(inst->skb, NFULA_PACKET_HDR, sizeof(pmsg), &pmsg); | |
433 | ||
d7a5c324 PM |
434 | if (prefix) |
435 | NFA_PUT(inst->skb, NFULA_PREFIX, plen, prefix); | |
0597f268 HW |
436 | |
437 | if (indev) { | |
438 | tmp_uint = htonl(indev->ifindex); | |
fbcd923c | 439 | #ifndef CONFIG_BRIDGE_NETFILTER |
0597f268 HW |
440 | NFA_PUT(inst->skb, NFULA_IFINDEX_INDEV, sizeof(tmp_uint), |
441 | &tmp_uint); | |
fbcd923c HW |
442 | #else |
443 | if (pf == PF_BRIDGE) { | |
444 | /* Case 1: outdev is physical input device, we need to | |
445 | * look for bridge group (when called from | |
446 | * netfilter_bridge) */ | |
447 | NFA_PUT(inst->skb, NFULA_IFINDEX_PHYSINDEV, | |
448 | sizeof(tmp_uint), &tmp_uint); | |
449 | /* this is the bridge group "brX" */ | |
450 | tmp_uint = htonl(indev->br_port->br->dev->ifindex); | |
451 | NFA_PUT(inst->skb, NFULA_IFINDEX_INDEV, | |
452 | sizeof(tmp_uint), &tmp_uint); | |
453 | } else { | |
454 | /* Case 2: indev is bridge group, we need to look for | |
455 | * physical device (when called from ipv4) */ | |
456 | NFA_PUT(inst->skb, NFULA_IFINDEX_INDEV, | |
457 | sizeof(tmp_uint), &tmp_uint); | |
458 | if (skb->nf_bridge && skb->nf_bridge->physindev) { | |
601e68e1 | 459 | tmp_uint = |
fbcd923c HW |
460 | htonl(skb->nf_bridge->physindev->ifindex); |
461 | NFA_PUT(inst->skb, NFULA_IFINDEX_PHYSINDEV, | |
462 | sizeof(tmp_uint), &tmp_uint); | |
463 | } | |
464 | } | |
465 | #endif | |
0597f268 HW |
466 | } |
467 | ||
468 | if (outdev) { | |
469 | tmp_uint = htonl(outdev->ifindex); | |
fbcd923c | 470 | #ifndef CONFIG_BRIDGE_NETFILTER |
0597f268 HW |
471 | NFA_PUT(inst->skb, NFULA_IFINDEX_OUTDEV, sizeof(tmp_uint), |
472 | &tmp_uint); | |
fbcd923c HW |
473 | #else |
474 | if (pf == PF_BRIDGE) { | |
475 | /* Case 1: outdev is physical output device, we need to | |
476 | * look for bridge group (when called from | |
477 | * netfilter_bridge) */ | |
478 | NFA_PUT(inst->skb, NFULA_IFINDEX_PHYSOUTDEV, | |
479 | sizeof(tmp_uint), &tmp_uint); | |
480 | /* this is the bridge group "brX" */ | |
481 | tmp_uint = htonl(outdev->br_port->br->dev->ifindex); | |
482 | NFA_PUT(inst->skb, NFULA_IFINDEX_OUTDEV, | |
483 | sizeof(tmp_uint), &tmp_uint); | |
484 | } else { | |
485 | /* Case 2: indev is a bridge group, we need to look | |
486 | * for physical device (when called from ipv4) */ | |
487 | NFA_PUT(inst->skb, NFULA_IFINDEX_OUTDEV, | |
488 | sizeof(tmp_uint), &tmp_uint); | |
ba5dcee1 | 489 | if (skb->nf_bridge && skb->nf_bridge->physoutdev) { |
601e68e1 | 490 | tmp_uint = |
fbcd923c HW |
491 | htonl(skb->nf_bridge->physoutdev->ifindex); |
492 | NFA_PUT(inst->skb, NFULA_IFINDEX_PHYSOUTDEV, | |
493 | sizeof(tmp_uint), &tmp_uint); | |
494 | } | |
495 | } | |
496 | #endif | |
0597f268 HW |
497 | } |
498 | ||
82e91ffe TG |
499 | if (skb->mark) { |
500 | tmp_uint = htonl(skb->mark); | |
0597f268 HW |
501 | NFA_PUT(inst->skb, NFULA_MARK, sizeof(tmp_uint), &tmp_uint); |
502 | } | |
503 | ||
504 | if (indev && skb->dev && skb->dev->hard_header_parse) { | |
505 | struct nfulnl_msg_packet_hw phw; | |
98a4a861 | 506 | int len = skb->dev->hard_header_parse((struct sk_buff *)skb, |
0597f268 | 507 | phw.hw_addr); |
98a4a861 | 508 | phw.hw_addrlen = htons(len); |
0597f268 HW |
509 | NFA_PUT(inst->skb, NFULA_HWADDR, sizeof(phw), &phw); |
510 | } | |
511 | ||
b7aa0bf7 | 512 | if (skb->tstamp.tv64) { |
0597f268 | 513 | struct nfulnl_msg_packet_timestamp ts; |
b7aa0bf7 ED |
514 | struct timeval tv = ktime_to_timeval(skb->tstamp); |
515 | ts.sec = cpu_to_be64(tv.tv_sec); | |
516 | ts.usec = cpu_to_be64(tv.tv_usec); | |
0597f268 HW |
517 | |
518 | NFA_PUT(inst->skb, NFULA_TIMESTAMP, sizeof(ts), &ts); | |
519 | } | |
520 | ||
521 | /* UID */ | |
522 | if (skb->sk) { | |
523 | read_lock_bh(&skb->sk->sk_callback_lock); | |
524 | if (skb->sk->sk_socket && skb->sk->sk_socket->file) { | |
98a4a861 | 525 | __be32 uid = htonl(skb->sk->sk_socket->file->f_uid); |
0597f268 HW |
526 | /* need to unlock here since NFA_PUT may goto */ |
527 | read_unlock_bh(&skb->sk->sk_callback_lock); | |
528 | NFA_PUT(inst->skb, NFULA_UID, sizeof(uid), &uid); | |
529 | } else | |
530 | read_unlock_bh(&skb->sk->sk_callback_lock); | |
531 | } | |
532 | ||
0af5f6c1 HW |
533 | /* local sequence number */ |
534 | if (inst->flags & NFULNL_CFG_F_SEQ) { | |
535 | tmp_uint = htonl(inst->seq++); | |
536 | NFA_PUT(inst->skb, NFULA_SEQ, sizeof(tmp_uint), &tmp_uint); | |
537 | } | |
538 | /* global sequence number */ | |
539 | if (inst->flags & NFULNL_CFG_F_SEQ_GLOBAL) { | |
7fdeaf68 | 540 | tmp_uint = htonl(atomic_inc_return(&global_seq)); |
0af5f6c1 HW |
541 | NFA_PUT(inst->skb, NFULA_SEQ_GLOBAL, sizeof(tmp_uint), &tmp_uint); |
542 | } | |
543 | ||
0597f268 HW |
544 | if (data_len) { |
545 | struct nfattr *nfa; | |
546 | int size = NFA_LENGTH(data_len); | |
547 | ||
548 | if (skb_tailroom(inst->skb) < (int)NFA_SPACE(data_len)) { | |
549 | printk(KERN_WARNING "nfnetlink_log: no tailroom!\n"); | |
550 | goto nlmsg_failure; | |
551 | } | |
552 | ||
553 | nfa = (struct nfattr *)skb_put(inst->skb, NFA_ALIGN(size)); | |
554 | nfa->nfa_type = NFULA_PAYLOAD; | |
555 | nfa->nfa_len = size; | |
556 | ||
557 | if (skb_copy_bits(skb, 0, NFA_DATA(nfa), data_len)) | |
558 | BUG(); | |
559 | } | |
601e68e1 | 560 | |
0597f268 | 561 | nlh->nlmsg_len = inst->skb->tail - old_tail; |
a497097d | 562 | inst->lastnlh = nlh; |
0597f268 HW |
563 | return 0; |
564 | ||
565 | nlmsg_failure: | |
566 | UDEBUG("nlmsg_failure\n"); | |
567 | nfattr_failure: | |
568 | PRINTR(KERN_ERR "nfnetlink_log: error creating log nlmsg\n"); | |
569 | return -1; | |
570 | } | |
571 | ||
572 | #define RCV_SKB_FAIL(err) do { netlink_ack(skb, nlh, (err)); return; } while (0) | |
573 | ||
574 | static struct nf_loginfo default_loginfo = { | |
575 | .type = NF_LOG_TYPE_ULOG, | |
576 | .u = { | |
577 | .ulog = { | |
578 | .copy_len = 0xffff, | |
579 | .group = 0, | |
580 | .qthreshold = 1, | |
581 | }, | |
582 | }, | |
583 | }; | |
584 | ||
585 | /* log handler for internal netfilter logging api */ | |
586 | static void | |
587 | nfulnl_log_packet(unsigned int pf, | |
588 | unsigned int hooknum, | |
589 | const struct sk_buff *skb, | |
590 | const struct net_device *in, | |
591 | const struct net_device *out, | |
592 | const struct nf_loginfo *li_user, | |
593 | const char *prefix) | |
594 | { | |
595 | unsigned int size, data_len; | |
596 | struct nfulnl_instance *inst; | |
597 | const struct nf_loginfo *li; | |
598 | unsigned int qthreshold; | |
599 | unsigned int nlbufsiz; | |
d7a5c324 | 600 | unsigned int plen; |
0597f268 | 601 | |
601e68e1 | 602 | if (li_user && li_user->type == NF_LOG_TYPE_ULOG) |
0597f268 HW |
603 | li = li_user; |
604 | else | |
605 | li = &default_loginfo; | |
606 | ||
607 | inst = instance_lookup_get(li->u.ulog.group); | |
608 | if (!inst) | |
609 | inst = instance_lookup_get(0); | |
610 | if (!inst) { | |
611 | PRINTR("nfnetlink_log: trying to log packet, " | |
612 | "but no instance for group %u\n", li->u.ulog.group); | |
613 | return; | |
614 | } | |
615 | ||
d7a5c324 PM |
616 | plen = 0; |
617 | if (prefix) | |
881dbfe8 | 618 | plen = strlen(prefix) + 1; |
d7a5c324 | 619 | |
0597f268 HW |
620 | /* all macros expand to constant values at compile time */ |
621 | /* FIXME: do we want to make the size calculation conditional based on | |
622 | * what is actually present? way more branches and checks, but more | |
623 | * memory efficient... */ | |
624 | size = NLMSG_SPACE(sizeof(struct nfgenmsg)) | |
625 | + NFA_SPACE(sizeof(struct nfulnl_msg_packet_hdr)) | |
626 | + NFA_SPACE(sizeof(u_int32_t)) /* ifindex */ | |
627 | + NFA_SPACE(sizeof(u_int32_t)) /* ifindex */ | |
fbcd923c HW |
628 | #ifdef CONFIG_BRIDGE_NETFILTER |
629 | + NFA_SPACE(sizeof(u_int32_t)) /* ifindex */ | |
630 | + NFA_SPACE(sizeof(u_int32_t)) /* ifindex */ | |
631 | #endif | |
0597f268 HW |
632 | + NFA_SPACE(sizeof(u_int32_t)) /* mark */ |
633 | + NFA_SPACE(sizeof(u_int32_t)) /* uid */ | |
d7a5c324 | 634 | + NFA_SPACE(plen) /* prefix */ |
0597f268 HW |
635 | + NFA_SPACE(sizeof(struct nfulnl_msg_packet_hw)) |
636 | + NFA_SPACE(sizeof(struct nfulnl_msg_packet_timestamp)); | |
637 | ||
638 | UDEBUG("initial size=%u\n", size); | |
639 | ||
640 | spin_lock_bh(&inst->lock); | |
641 | ||
0af5f6c1 HW |
642 | if (inst->flags & NFULNL_CFG_F_SEQ) |
643 | size += NFA_SPACE(sizeof(u_int32_t)); | |
644 | if (inst->flags & NFULNL_CFG_F_SEQ_GLOBAL) | |
645 | size += NFA_SPACE(sizeof(u_int32_t)); | |
646 | ||
0597f268 HW |
647 | qthreshold = inst->qthreshold; |
648 | /* per-rule qthreshold overrides per-instance */ | |
649 | if (qthreshold > li->u.ulog.qthreshold) | |
650 | qthreshold = li->u.ulog.qthreshold; | |
601e68e1 | 651 | |
0597f268 HW |
652 | switch (inst->copy_mode) { |
653 | case NFULNL_COPY_META: | |
654 | case NFULNL_COPY_NONE: | |
655 | data_len = 0; | |
656 | break; | |
601e68e1 | 657 | |
0597f268 | 658 | case NFULNL_COPY_PACKET: |
601e68e1 | 659 | if (inst->copy_range == 0 |
0597f268 HW |
660 | || inst->copy_range > skb->len) |
661 | data_len = skb->len; | |
662 | else | |
663 | data_len = inst->copy_range; | |
601e68e1 | 664 | |
0597f268 HW |
665 | size += NFA_SPACE(data_len); |
666 | UDEBUG("copy_packet, therefore size now %u\n", size); | |
667 | break; | |
601e68e1 | 668 | |
0597f268 HW |
669 | default: |
670 | spin_unlock_bh(&inst->lock); | |
671 | instance_put(inst); | |
672 | return; | |
673 | } | |
674 | ||
675 | if (size > inst->nlbufsiz) | |
676 | nlbufsiz = size; | |
677 | else | |
678 | nlbufsiz = inst->nlbufsiz; | |
679 | ||
680 | if (!inst->skb) { | |
681 | if (!(inst->skb = nfulnl_alloc_skb(nlbufsiz, size))) { | |
682 | UDEBUG("error in nfulnl_alloc_skb(%u, %u)\n", | |
683 | inst->nlbufsiz, size); | |
684 | goto alloc_failure; | |
685 | } | |
686 | } else if (inst->qlen >= qthreshold || | |
687 | size > skb_tailroom(inst->skb)) { | |
688 | /* either the queue len is too high or we don't have | |
689 | * enough room in the skb left. flush to userspace. */ | |
690 | UDEBUG("flushing old skb\n"); | |
691 | ||
b4d6202b MM |
692 | /* timer "holds" one reference (we have another one) */ |
693 | if (del_timer(&inst->timer)) | |
694 | instance_put(inst); | |
0597f268 HW |
695 | __nfulnl_send(inst); |
696 | ||
697 | if (!(inst->skb = nfulnl_alloc_skb(nlbufsiz, size))) { | |
698 | UDEBUG("error in nfulnl_alloc_skb(%u, %u)\n", | |
699 | inst->nlbufsiz, size); | |
700 | goto alloc_failure; | |
701 | } | |
702 | } | |
703 | ||
704 | UDEBUG("qlen %d, qthreshold %d\n", inst->qlen, qthreshold); | |
705 | inst->qlen++; | |
706 | ||
707 | __build_packet_message(inst, skb, data_len, pf, | |
d7a5c324 | 708 | hooknum, in, out, li, prefix, plen); |
0597f268 HW |
709 | |
710 | /* timer_pending always called within inst->lock, so there | |
711 | * is no chance of a race here */ | |
712 | if (!timer_pending(&inst->timer)) { | |
713 | instance_get(inst); | |
714 | inst->timer.expires = jiffies + (inst->flushtimeout*HZ/100); | |
715 | add_timer(&inst->timer); | |
716 | } | |
0597f268 | 717 | |
ed32abea MM |
718 | unlock_and_release: |
719 | spin_unlock_bh(&inst->lock); | |
720 | instance_put(inst); | |
0597f268 HW |
721 | return; |
722 | ||
723 | alloc_failure: | |
0597f268 HW |
724 | UDEBUG("error allocating skb\n"); |
725 | /* FIXME: statistics */ | |
ed32abea | 726 | goto unlock_and_release; |
0597f268 HW |
727 | } |
728 | ||
729 | static int | |
730 | nfulnl_rcv_nl_event(struct notifier_block *this, | |
731 | unsigned long event, void *ptr) | |
732 | { | |
733 | struct netlink_notify *n = ptr; | |
734 | ||
735 | if (event == NETLINK_URELEASE && | |
736 | n->protocol == NETLINK_NETFILTER && n->pid) { | |
737 | int i; | |
738 | ||
739 | /* destroy all instances for this pid */ | |
740 | write_lock_bh(&instances_lock); | |
741 | for (i = 0; i < INSTANCE_BUCKETS; i++) { | |
742 | struct hlist_node *tmp, *t2; | |
743 | struct nfulnl_instance *inst; | |
744 | struct hlist_head *head = &instance_table[i]; | |
745 | ||
746 | hlist_for_each_entry_safe(inst, tmp, t2, head, hlist) { | |
747 | UDEBUG("node = %p\n", inst); | |
748 | if (n->pid == inst->peer_pid) | |
749 | __instance_destroy(inst); | |
750 | } | |
751 | } | |
752 | write_unlock_bh(&instances_lock); | |
753 | } | |
754 | return NOTIFY_DONE; | |
755 | } | |
756 | ||
757 | static struct notifier_block nfulnl_rtnl_notifier = { | |
758 | .notifier_call = nfulnl_rcv_nl_event, | |
759 | }; | |
760 | ||
761 | static int | |
762 | nfulnl_recv_unsupp(struct sock *ctnl, struct sk_buff *skb, | |
763 | struct nlmsghdr *nlh, struct nfattr *nfqa[], int *errp) | |
764 | { | |
765 | return -ENOTSUPP; | |
766 | } | |
767 | ||
768 | static struct nf_logger nfulnl_logger = { | |
769 | .name = "nfnetlink_log", | |
770 | .logfn = &nfulnl_log_packet, | |
771 | .me = THIS_MODULE, | |
772 | }; | |
773 | ||
774 | static const int nfula_min[NFULA_MAX] = { | |
775 | [NFULA_PACKET_HDR-1] = sizeof(struct nfulnl_msg_packet_hdr), | |
776 | [NFULA_MARK-1] = sizeof(u_int32_t), | |
777 | [NFULA_TIMESTAMP-1] = sizeof(struct nfulnl_msg_packet_timestamp), | |
778 | [NFULA_IFINDEX_INDEV-1] = sizeof(u_int32_t), | |
779 | [NFULA_IFINDEX_OUTDEV-1]= sizeof(u_int32_t), | |
0af5f6c1 HW |
780 | [NFULA_IFINDEX_PHYSINDEV-1] = sizeof(u_int32_t), |
781 | [NFULA_IFINDEX_PHYSOUTDEV-1] = sizeof(u_int32_t), | |
0597f268 HW |
782 | [NFULA_HWADDR-1] = sizeof(struct nfulnl_msg_packet_hw), |
783 | [NFULA_PAYLOAD-1] = 0, | |
784 | [NFULA_PREFIX-1] = 0, | |
785 | [NFULA_UID-1] = sizeof(u_int32_t), | |
0af5f6c1 HW |
786 | [NFULA_SEQ-1] = sizeof(u_int32_t), |
787 | [NFULA_SEQ_GLOBAL-1] = sizeof(u_int32_t), | |
0597f268 HW |
788 | }; |
789 | ||
790 | static const int nfula_cfg_min[NFULA_CFG_MAX] = { | |
791 | [NFULA_CFG_CMD-1] = sizeof(struct nfulnl_msg_config_cmd), | |
792 | [NFULA_CFG_MODE-1] = sizeof(struct nfulnl_msg_config_mode), | |
793 | [NFULA_CFG_TIMEOUT-1] = sizeof(u_int32_t), | |
794 | [NFULA_CFG_QTHRESH-1] = sizeof(u_int32_t), | |
795 | [NFULA_CFG_NLBUFSIZ-1] = sizeof(u_int32_t), | |
0af5f6c1 | 796 | [NFULA_CFG_FLAGS-1] = sizeof(u_int16_t), |
0597f268 HW |
797 | }; |
798 | ||
799 | static int | |
800 | nfulnl_recv_config(struct sock *ctnl, struct sk_buff *skb, | |
801 | struct nlmsghdr *nlh, struct nfattr *nfula[], int *errp) | |
802 | { | |
803 | struct nfgenmsg *nfmsg = NLMSG_DATA(nlh); | |
804 | u_int16_t group_num = ntohs(nfmsg->res_id); | |
805 | struct nfulnl_instance *inst; | |
806 | int ret = 0; | |
807 | ||
808 | UDEBUG("entering for msg %u\n", NFNL_MSG_TYPE(nlh->nlmsg_type)); | |
809 | ||
810 | if (nfattr_bad_size(nfula, NFULA_CFG_MAX, nfula_cfg_min)) { | |
811 | UDEBUG("bad attribute size\n"); | |
812 | return -EINVAL; | |
813 | } | |
814 | ||
815 | inst = instance_lookup_get(group_num); | |
816 | if (nfula[NFULA_CFG_CMD-1]) { | |
817 | u_int8_t pf = nfmsg->nfgen_family; | |
818 | struct nfulnl_msg_config_cmd *cmd; | |
819 | cmd = NFA_DATA(nfula[NFULA_CFG_CMD-1]); | |
820 | UDEBUG("found CFG_CMD for\n"); | |
821 | ||
822 | switch (cmd->command) { | |
823 | case NFULNL_CFG_CMD_BIND: | |
824 | if (inst) { | |
825 | ret = -EBUSY; | |
826 | goto out_put; | |
827 | } | |
828 | ||
829 | inst = instance_create(group_num, | |
830 | NETLINK_CB(skb).pid); | |
831 | if (!inst) { | |
832 | ret = -EINVAL; | |
833 | goto out_put; | |
834 | } | |
835 | break; | |
836 | case NFULNL_CFG_CMD_UNBIND: | |
837 | if (!inst) { | |
838 | ret = -ENODEV; | |
839 | goto out_put; | |
840 | } | |
841 | ||
842 | if (inst->peer_pid != NETLINK_CB(skb).pid) { | |
843 | ret = -EPERM; | |
844 | goto out_put; | |
845 | } | |
846 | ||
847 | instance_destroy(inst); | |
848 | break; | |
849 | case NFULNL_CFG_CMD_PF_BIND: | |
850 | UDEBUG("registering log handler for pf=%u\n", pf); | |
851 | ret = nf_log_register(pf, &nfulnl_logger); | |
852 | break; | |
853 | case NFULNL_CFG_CMD_PF_UNBIND: | |
854 | UDEBUG("unregistering log handler for pf=%u\n", pf); | |
855 | /* This is a bug and a feature. We cannot unregister | |
856 | * other handlers, like nfnetlink_inst can */ | |
857 | nf_log_unregister_pf(pf); | |
858 | break; | |
859 | default: | |
860 | ret = -EINVAL; | |
861 | break; | |
862 | } | |
dd16704e MM |
863 | |
864 | if (!inst) | |
865 | goto out; | |
0597f268 HW |
866 | } else { |
867 | if (!inst) { | |
868 | UDEBUG("no config command, and no instance for " | |
869 | "group=%u pid=%u =>ENOENT\n", | |
870 | group_num, NETLINK_CB(skb).pid); | |
871 | ret = -ENOENT; | |
872 | goto out_put; | |
873 | } | |
874 | ||
875 | if (inst->peer_pid != NETLINK_CB(skb).pid) { | |
876 | UDEBUG("no config command, and wrong pid\n"); | |
877 | ret = -EPERM; | |
878 | goto out_put; | |
879 | } | |
880 | } | |
881 | ||
882 | if (nfula[NFULA_CFG_MODE-1]) { | |
883 | struct nfulnl_msg_config_mode *params; | |
884 | params = NFA_DATA(nfula[NFULA_CFG_MODE-1]); | |
885 | ||
886 | nfulnl_set_mode(inst, params->copy_mode, | |
d1208b99 | 887 | ntohl(params->copy_range)); |
0597f268 HW |
888 | } |
889 | ||
890 | if (nfula[NFULA_CFG_TIMEOUT-1]) { | |
98a4a861 AV |
891 | __be32 timeout = |
892 | *(__be32 *)NFA_DATA(nfula[NFULA_CFG_TIMEOUT-1]); | |
0597f268 HW |
893 | |
894 | nfulnl_set_timeout(inst, ntohl(timeout)); | |
895 | } | |
896 | ||
897 | if (nfula[NFULA_CFG_NLBUFSIZ-1]) { | |
98a4a861 AV |
898 | __be32 nlbufsiz = |
899 | *(__be32 *)NFA_DATA(nfula[NFULA_CFG_NLBUFSIZ-1]); | |
0597f268 HW |
900 | |
901 | nfulnl_set_nlbufsiz(inst, ntohl(nlbufsiz)); | |
902 | } | |
903 | ||
904 | if (nfula[NFULA_CFG_QTHRESH-1]) { | |
7ac00a24 AV |
905 | __be32 qthresh = |
906 | *(__be32 *)NFA_DATA(nfula[NFULA_CFG_QTHRESH-1]); | |
0597f268 HW |
907 | |
908 | nfulnl_set_qthresh(inst, ntohl(qthresh)); | |
909 | } | |
910 | ||
0af5f6c1 | 911 | if (nfula[NFULA_CFG_FLAGS-1]) { |
98a4a861 AV |
912 | __be16 flags = |
913 | *(__be16 *)NFA_DATA(nfula[NFULA_CFG_FLAGS-1]); | |
ee433530 | 914 | nfulnl_set_flags(inst, ntohs(flags)); |
0af5f6c1 HW |
915 | } |
916 | ||
0597f268 HW |
917 | out_put: |
918 | instance_put(inst); | |
dd16704e | 919 | out: |
0597f268 HW |
920 | return ret; |
921 | } | |
922 | ||
923 | static struct nfnl_callback nfulnl_cb[NFULNL_MSG_MAX] = { | |
924 | [NFULNL_MSG_PACKET] = { .call = nfulnl_recv_unsupp, | |
37d2e7a2 | 925 | .attr_count = NFULA_MAX, }, |
0597f268 | 926 | [NFULNL_MSG_CONFIG] = { .call = nfulnl_recv_config, |
37d2e7a2 | 927 | .attr_count = NFULA_CFG_MAX, }, |
0597f268 HW |
928 | }; |
929 | ||
930 | static struct nfnetlink_subsystem nfulnl_subsys = { | |
931 | .name = "log", | |
932 | .subsys_id = NFNL_SUBSYS_ULOG, | |
933 | .cb_count = NFULNL_MSG_MAX, | |
0597f268 HW |
934 | .cb = nfulnl_cb, |
935 | }; | |
936 | ||
937 | #ifdef CONFIG_PROC_FS | |
938 | struct iter_state { | |
939 | unsigned int bucket; | |
940 | }; | |
941 | ||
942 | static struct hlist_node *get_first(struct seq_file *seq) | |
943 | { | |
944 | struct iter_state *st = seq->private; | |
945 | ||
946 | if (!st) | |
947 | return NULL; | |
948 | ||
949 | for (st->bucket = 0; st->bucket < INSTANCE_BUCKETS; st->bucket++) { | |
950 | if (!hlist_empty(&instance_table[st->bucket])) | |
951 | return instance_table[st->bucket].first; | |
952 | } | |
953 | return NULL; | |
954 | } | |
955 | ||
956 | static struct hlist_node *get_next(struct seq_file *seq, struct hlist_node *h) | |
957 | { | |
958 | struct iter_state *st = seq->private; | |
959 | ||
960 | h = h->next; | |
961 | while (!h) { | |
962 | if (++st->bucket >= INSTANCE_BUCKETS) | |
963 | return NULL; | |
964 | ||
965 | h = instance_table[st->bucket].first; | |
966 | } | |
967 | return h; | |
968 | } | |
969 | ||
970 | static struct hlist_node *get_idx(struct seq_file *seq, loff_t pos) | |
971 | { | |
972 | struct hlist_node *head; | |
973 | head = get_first(seq); | |
974 | ||
975 | if (head) | |
976 | while (pos && (head = get_next(seq, head))) | |
977 | pos--; | |
978 | return pos ? NULL : head; | |
979 | } | |
980 | ||
981 | static void *seq_start(struct seq_file *seq, loff_t *pos) | |
982 | { | |
983 | read_lock_bh(&instances_lock); | |
984 | return get_idx(seq, *pos); | |
985 | } | |
986 | ||
987 | static void *seq_next(struct seq_file *s, void *v, loff_t *pos) | |
988 | { | |
989 | (*pos)++; | |
990 | return get_next(s, v); | |
991 | } | |
992 | ||
993 | static void seq_stop(struct seq_file *s, void *v) | |
994 | { | |
995 | read_unlock_bh(&instances_lock); | |
996 | } | |
997 | ||
998 | static int seq_show(struct seq_file *s, void *v) | |
999 | { | |
1000 | const struct nfulnl_instance *inst = v; | |
1001 | ||
601e68e1 | 1002 | return seq_printf(s, "%5d %6d %5d %1d %5d %6d %2d\n", |
0597f268 | 1003 | inst->group_num, |
601e68e1 | 1004 | inst->peer_pid, inst->qlen, |
0597f268 HW |
1005 | inst->copy_mode, inst->copy_range, |
1006 | inst->flushtimeout, atomic_read(&inst->use)); | |
1007 | } | |
1008 | ||
1009 | static struct seq_operations nful_seq_ops = { | |
1010 | .start = seq_start, | |
1011 | .next = seq_next, | |
1012 | .stop = seq_stop, | |
1013 | .show = seq_show, | |
1014 | }; | |
1015 | ||
1016 | static int nful_open(struct inode *inode, struct file *file) | |
1017 | { | |
1018 | struct seq_file *seq; | |
1019 | struct iter_state *is; | |
1020 | int ret; | |
1021 | ||
10dfdc69 | 1022 | is = kzalloc(sizeof(*is), GFP_KERNEL); |
0597f268 HW |
1023 | if (!is) |
1024 | return -ENOMEM; | |
0597f268 HW |
1025 | ret = seq_open(file, &nful_seq_ops); |
1026 | if (ret < 0) | |
1027 | goto out_free; | |
1028 | seq = file->private_data; | |
1029 | seq->private = is; | |
1030 | return ret; | |
1031 | out_free: | |
1032 | kfree(is); | |
1033 | return ret; | |
1034 | } | |
1035 | ||
da7071d7 | 1036 | static const struct file_operations nful_file_ops = { |
0597f268 HW |
1037 | .owner = THIS_MODULE, |
1038 | .open = nful_open, | |
1039 | .read = seq_read, | |
1040 | .llseek = seq_lseek, | |
1041 | .release = seq_release_private, | |
1042 | }; | |
1043 | ||
1044 | #endif /* PROC_FS */ | |
1045 | ||
32292a7f | 1046 | static int __init nfnetlink_log_init(void) |
0597f268 HW |
1047 | { |
1048 | int i, status = -ENOMEM; | |
1049 | #ifdef CONFIG_PROC_FS | |
1050 | struct proc_dir_entry *proc_nful; | |
1051 | #endif | |
601e68e1 | 1052 | |
0597f268 HW |
1053 | for (i = 0; i < INSTANCE_BUCKETS; i++) |
1054 | INIT_HLIST_HEAD(&instance_table[i]); | |
601e68e1 | 1055 | |
0597f268 HW |
1056 | /* it's not really all that important to have a random value, so |
1057 | * we can do this from the init function, even if there hasn't | |
1058 | * been that much entropy yet */ | |
1059 | get_random_bytes(&hash_init, sizeof(hash_init)); | |
1060 | ||
1061 | netlink_register_notifier(&nfulnl_rtnl_notifier); | |
1062 | status = nfnetlink_subsys_register(&nfulnl_subsys); | |
1063 | if (status < 0) { | |
1064 | printk(KERN_ERR "log: failed to create netlink socket\n"); | |
1065 | goto cleanup_netlink_notifier; | |
1066 | } | |
1067 | ||
1068 | #ifdef CONFIG_PROC_FS | |
1069 | proc_nful = create_proc_entry("nfnetlink_log", 0440, | |
1070 | proc_net_netfilter); | |
1071 | if (!proc_nful) | |
1072 | goto cleanup_subsys; | |
1073 | proc_nful->proc_fops = &nful_file_ops; | |
1074 | #endif | |
0597f268 HW |
1075 | return status; |
1076 | ||
0597f268 | 1077 | #ifdef CONFIG_PROC_FS |
0597f268 | 1078 | cleanup_subsys: |
0597f268 | 1079 | nfnetlink_subsys_unregister(&nfulnl_subsys); |
32292a7f | 1080 | #endif |
0597f268 HW |
1081 | cleanup_netlink_notifier: |
1082 | netlink_unregister_notifier(&nfulnl_rtnl_notifier); | |
1083 | return status; | |
1084 | } | |
1085 | ||
65b4b4e8 | 1086 | static void __exit nfnetlink_log_fini(void) |
0597f268 | 1087 | { |
e92ad99c | 1088 | nf_log_unregister(&nfulnl_logger); |
32292a7f PM |
1089 | #ifdef CONFIG_PROC_FS |
1090 | remove_proc_entry("nfnetlink_log", proc_net_netfilter); | |
1091 | #endif | |
1092 | nfnetlink_subsys_unregister(&nfulnl_subsys); | |
1093 | netlink_unregister_notifier(&nfulnl_rtnl_notifier); | |
0597f268 HW |
1094 | } |
1095 | ||
1096 | MODULE_DESCRIPTION("netfilter userspace logging"); | |
1097 | MODULE_AUTHOR("Harald Welte <laforge@netfilter.org>"); | |
1098 | MODULE_LICENSE("GPL"); | |
f682faef | 1099 | MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_ULOG); |
0597f268 | 1100 | |
65b4b4e8 AM |
1101 | module_init(nfnetlink_log_init); |
1102 | module_exit(nfnetlink_log_fini); |