Commit | Line | Data |
---|---|---|
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> | |
31 | #include <net/sock.h> | |
32 | ||
33 | #include <asm/atomic.h> | |
34 | ||
fbcd923c HW |
35 | #ifdef CONFIG_BRIDGE_NETFILTER |
36 | #include "../bridge/br_private.h" | |
37 | #endif | |
38 | ||
c2db2924 | 39 | #define NFULNL_NLBUFSIZ_DEFAULT NLMSG_GOODSIZE |
0597f268 HW |
40 | #define NFULNL_TIMEOUT_DEFAULT 100 /* every second */ |
41 | #define NFULNL_QTHRESH_DEFAULT 100 /* 100 packets */ | |
42 | ||
43 | #define PRINTR(x, args...) do { if (net_ratelimit()) \ | |
44 | printk(x, ## args); } while (0); | |
45 | ||
46 | #if 0 | |
47 | #define UDEBUG(x, args ...) printk(KERN_DEBUG "%s(%d):%s(): " x, \ | |
48 | __FILE__, __LINE__, __FUNCTION__, \ | |
49 | ## args) | |
50 | #else | |
51 | #define UDEBUG(x, ...) | |
52 | #endif | |
53 | ||
54 | struct nfulnl_instance { | |
55 | struct hlist_node hlist; /* global list of instances */ | |
56 | spinlock_t lock; | |
57 | atomic_t use; /* use count */ | |
58 | ||
59 | unsigned int qlen; /* number of nlmsgs in skb */ | |
60 | struct sk_buff *skb; /* pre-allocatd skb */ | |
0597f268 HW |
61 | struct timer_list timer; |
62 | int peer_pid; /* PID of the peer process */ | |
63 | ||
64 | /* configurable parameters */ | |
65 | unsigned int flushtimeout; /* timeout until queue flush */ | |
66 | unsigned int nlbufsiz; /* netlink buffer allocation size */ | |
67 | unsigned int qthreshold; /* threshold of the queue */ | |
68 | u_int32_t copy_range; | |
0af5f6c1 | 69 | u_int32_t seq; /* instance-local sequential counter */ |
0597f268 | 70 | u_int16_t group_num; /* number of this queue */ |
0af5f6c1 | 71 | u_int16_t flags; |
601e68e1 | 72 | u_int8_t copy_mode; |
0597f268 HW |
73 | }; |
74 | ||
75 | static DEFINE_RWLOCK(instances_lock); | |
0af5f6c1 | 76 | static atomic_t global_seq; |
0597f268 HW |
77 | |
78 | #define INSTANCE_BUCKETS 16 | |
79 | static struct hlist_head instance_table[INSTANCE_BUCKETS]; | |
80 | static unsigned int hash_init; | |
81 | ||
82 | static inline u_int8_t instance_hashfn(u_int16_t group_num) | |
83 | { | |
84 | return ((group_num & 0xff) % INSTANCE_BUCKETS); | |
85 | } | |
86 | ||
87 | static struct nfulnl_instance * | |
88 | __instance_lookup(u_int16_t group_num) | |
89 | { | |
90 | struct hlist_head *head; | |
91 | struct hlist_node *pos; | |
92 | struct nfulnl_instance *inst; | |
93 | ||
94 | UDEBUG("entering (group_num=%u)\n", group_num); | |
95 | ||
96 | head = &instance_table[instance_hashfn(group_num)]; | |
97 | hlist_for_each_entry(inst, pos, head, hlist) { | |
98 | if (inst->group_num == group_num) | |
99 | return inst; | |
100 | } | |
101 | return NULL; | |
102 | } | |
103 | ||
104 | static inline void | |
105 | instance_get(struct nfulnl_instance *inst) | |
106 | { | |
107 | atomic_inc(&inst->use); | |
108 | } | |
109 | ||
110 | static struct nfulnl_instance * | |
111 | instance_lookup_get(u_int16_t group_num) | |
112 | { | |
113 | struct nfulnl_instance *inst; | |
114 | ||
115 | read_lock_bh(&instances_lock); | |
116 | inst = __instance_lookup(group_num); | |
117 | if (inst) | |
118 | instance_get(inst); | |
119 | read_unlock_bh(&instances_lock); | |
120 | ||
121 | return inst; | |
122 | } | |
123 | ||
124 | static void | |
125 | instance_put(struct nfulnl_instance *inst) | |
126 | { | |
127 | if (inst && atomic_dec_and_test(&inst->use)) { | |
128 | UDEBUG("kfree(inst=%p)\n", inst); | |
129 | kfree(inst); | |
7d90e86d | 130 | module_put(THIS_MODULE); |
0597f268 HW |
131 | } |
132 | } | |
133 | ||
134 | static void nfulnl_timer(unsigned long data); | |
135 | ||
136 | static struct nfulnl_instance * | |
137 | instance_create(u_int16_t group_num, int pid) | |
138 | { | |
139 | struct nfulnl_instance *inst; | |
140 | ||
141 | UDEBUG("entering (group_num=%u, pid=%d)\n", group_num, | |
142 | pid); | |
143 | ||
601e68e1 | 144 | write_lock_bh(&instances_lock); |
0597f268 HW |
145 | if (__instance_lookup(group_num)) { |
146 | inst = NULL; | |
147 | UDEBUG("aborting, instance already exists\n"); | |
148 | goto out_unlock; | |
149 | } | |
150 | ||
10dfdc69 | 151 | inst = kzalloc(sizeof(*inst), GFP_ATOMIC); |
0597f268 HW |
152 | if (!inst) |
153 | goto out_unlock; | |
154 | ||
0597f268 | 155 | INIT_HLIST_NODE(&inst->hlist); |
181a46a5 | 156 | spin_lock_init(&inst->lock); |
0597f268 HW |
157 | /* needs to be two, since we _put() after creation */ |
158 | atomic_set(&inst->use, 2); | |
159 | ||
e6f689db | 160 | setup_timer(&inst->timer, nfulnl_timer, (unsigned long)inst); |
0597f268 HW |
161 | |
162 | inst->peer_pid = pid; | |
163 | inst->group_num = group_num; | |
164 | ||
165 | inst->qthreshold = NFULNL_QTHRESH_DEFAULT; | |
166 | inst->flushtimeout = NFULNL_TIMEOUT_DEFAULT; | |
167 | inst->nlbufsiz = NFULNL_NLBUFSIZ_DEFAULT; | |
168 | inst->copy_mode = NFULNL_COPY_PACKET; | |
169 | inst->copy_range = 0xffff; | |
170 | ||
171 | if (!try_module_get(THIS_MODULE)) | |
172 | goto out_free; | |
173 | ||
601e68e1 | 174 | hlist_add_head(&inst->hlist, |
0597f268 HW |
175 | &instance_table[instance_hashfn(group_num)]); |
176 | ||
601e68e1 | 177 | UDEBUG("newly added node: %p, next=%p\n", &inst->hlist, |
0597f268 HW |
178 | inst->hlist.next); |
179 | ||
180 | write_unlock_bh(&instances_lock); | |
181 | ||
182 | return inst; | |
183 | ||
184 | out_free: | |
185 | instance_put(inst); | |
186 | out_unlock: | |
187 | write_unlock_bh(&instances_lock); | |
188 | return NULL; | |
189 | } | |
190 | ||
191 | static int __nfulnl_send(struct nfulnl_instance *inst); | |
192 | ||
193 | static void | |
9afdb00c | 194 | __instance_destroy(struct nfulnl_instance *inst) |
0597f268 HW |
195 | { |
196 | /* first pull it out of the global list */ | |
0597f268 HW |
197 | UDEBUG("removing instance %p (queuenum=%u) from hash\n", |
198 | inst, inst->group_num); | |
199 | ||
200 | hlist_del(&inst->hlist); | |
201 | ||
0597f268 HW |
202 | /* then flush all pending packets from skb */ |
203 | ||
204 | spin_lock_bh(&inst->lock); | |
205 | if (inst->skb) { | |
b4d6202b MM |
206 | /* timer "holds" one reference (we have one more) */ |
207 | if (del_timer(&inst->timer)) | |
208 | instance_put(inst); | |
0597f268 HW |
209 | if (inst->qlen) |
210 | __nfulnl_send(inst); | |
211 | if (inst->skb) { | |
212 | kfree_skb(inst->skb); | |
213 | inst->skb = NULL; | |
214 | } | |
215 | } | |
216 | spin_unlock_bh(&inst->lock); | |
217 | ||
218 | /* and finally put the refcount */ | |
219 | instance_put(inst); | |
0597f268 HW |
220 | } |
221 | ||
0597f268 HW |
222 | static inline void |
223 | instance_destroy(struct nfulnl_instance *inst) | |
224 | { | |
9afdb00c PM |
225 | write_lock_bh(&instances_lock); |
226 | __instance_destroy(inst); | |
227 | write_unlock_bh(&instances_lock); | |
0597f268 HW |
228 | } |
229 | ||
230 | static int | |
231 | nfulnl_set_mode(struct nfulnl_instance *inst, u_int8_t mode, | |
232 | unsigned int range) | |
233 | { | |
234 | int status = 0; | |
235 | ||
236 | spin_lock_bh(&inst->lock); | |
601e68e1 | 237 | |
0597f268 HW |
238 | switch (mode) { |
239 | case NFULNL_COPY_NONE: | |
240 | case NFULNL_COPY_META: | |
241 | inst->copy_mode = mode; | |
242 | inst->copy_range = 0; | |
243 | break; | |
601e68e1 | 244 | |
0597f268 HW |
245 | case NFULNL_COPY_PACKET: |
246 | inst->copy_mode = mode; | |
df6fb868 | 247 | /* we're using struct nlattr which has 16bit nfa_len */ |
0597f268 HW |
248 | if (range > 0xffff) |
249 | inst->copy_range = 0xffff; | |
250 | else | |
251 | inst->copy_range = range; | |
252 | break; | |
601e68e1 | 253 | |
0597f268 HW |
254 | default: |
255 | status = -EINVAL; | |
256 | break; | |
257 | } | |
258 | ||
259 | spin_unlock_bh(&inst->lock); | |
260 | ||
261 | return status; | |
262 | } | |
263 | ||
264 | static int | |
265 | nfulnl_set_nlbufsiz(struct nfulnl_instance *inst, u_int32_t nlbufsiz) | |
266 | { | |
267 | int status; | |
268 | ||
269 | spin_lock_bh(&inst->lock); | |
270 | if (nlbufsiz < NFULNL_NLBUFSIZ_DEFAULT) | |
271 | status = -ERANGE; | |
272 | else if (nlbufsiz > 131072) | |
273 | status = -ERANGE; | |
274 | else { | |
275 | inst->nlbufsiz = nlbufsiz; | |
276 | status = 0; | |
277 | } | |
278 | spin_unlock_bh(&inst->lock); | |
279 | ||
280 | return status; | |
281 | } | |
282 | ||
283 | static int | |
284 | nfulnl_set_timeout(struct nfulnl_instance *inst, u_int32_t timeout) | |
285 | { | |
286 | spin_lock_bh(&inst->lock); | |
287 | inst->flushtimeout = timeout; | |
288 | spin_unlock_bh(&inst->lock); | |
289 | ||
290 | return 0; | |
291 | } | |
292 | ||
293 | static int | |
294 | nfulnl_set_qthresh(struct nfulnl_instance *inst, u_int32_t qthresh) | |
295 | { | |
296 | spin_lock_bh(&inst->lock); | |
297 | inst->qthreshold = qthresh; | |
298 | spin_unlock_bh(&inst->lock); | |
299 | ||
300 | return 0; | |
301 | } | |
302 | ||
0af5f6c1 HW |
303 | static int |
304 | nfulnl_set_flags(struct nfulnl_instance *inst, u_int16_t flags) | |
305 | { | |
306 | spin_lock_bh(&inst->lock); | |
ee433530 | 307 | inst->flags = flags; |
0af5f6c1 HW |
308 | spin_unlock_bh(&inst->lock); |
309 | ||
310 | return 0; | |
311 | } | |
312 | ||
601e68e1 | 313 | static struct sk_buff *nfulnl_alloc_skb(unsigned int inst_size, |
0597f268 HW |
314 | unsigned int pkt_size) |
315 | { | |
316 | struct sk_buff *skb; | |
ad2ad0f9 | 317 | unsigned int n; |
0597f268 HW |
318 | |
319 | UDEBUG("entered (%u, %u)\n", inst_size, pkt_size); | |
320 | ||
321 | /* alloc skb which should be big enough for a whole multipart | |
322 | * message. WARNING: has to be <= 128k due to slab restrictions */ | |
323 | ||
ad2ad0f9 PM |
324 | n = max(inst_size, pkt_size); |
325 | skb = alloc_skb(n, GFP_ATOMIC); | |
0597f268 HW |
326 | if (!skb) { |
327 | PRINTR("nfnetlink_log: can't alloc whole buffer (%u bytes)\n", | |
328 | inst_size); | |
329 | ||
ad2ad0f9 PM |
330 | if (n > pkt_size) { |
331 | /* try to allocate only as much as we need for current | |
332 | * packet */ | |
0597f268 | 333 | |
ad2ad0f9 PM |
334 | skb = alloc_skb(pkt_size, GFP_ATOMIC); |
335 | if (!skb) | |
336 | PRINTR("nfnetlink_log: can't even alloc %u " | |
337 | "bytes\n", pkt_size); | |
338 | } | |
0597f268 HW |
339 | } |
340 | ||
341 | return skb; | |
342 | } | |
343 | ||
344 | static int | |
345 | __nfulnl_send(struct nfulnl_instance *inst) | |
346 | { | |
29c5d4af | 347 | int status = -1; |
0597f268 | 348 | |
0597f268 | 349 | if (inst->qlen > 1) |
29c5d4af EL |
350 | NLMSG_PUT(inst->skb, 0, 0, |
351 | NLMSG_DONE, | |
352 | sizeof(struct nfgenmsg)); | |
0597f268 HW |
353 | |
354 | status = nfnetlink_unicast(inst->skb, inst->peer_pid, MSG_DONTWAIT); | |
355 | if (status < 0) { | |
356 | UDEBUG("netlink_unicast() failed\n"); | |
357 | /* FIXME: statistics */ | |
358 | } | |
359 | ||
360 | inst->qlen = 0; | |
361 | inst->skb = NULL; | |
0597f268 | 362 | |
29c5d4af | 363 | nlmsg_failure: |
0597f268 HW |
364 | return status; |
365 | } | |
366 | ||
367 | static void nfulnl_timer(unsigned long data) | |
368 | { | |
601e68e1 | 369 | struct nfulnl_instance *inst = (struct nfulnl_instance *)data; |
0597f268 HW |
370 | |
371 | UDEBUG("timer function called, flushing buffer\n"); | |
372 | ||
373 | spin_lock_bh(&inst->lock); | |
370e6a87 MM |
374 | if (inst->skb) |
375 | __nfulnl_send(inst); | |
0597f268 | 376 | spin_unlock_bh(&inst->lock); |
05f7b7b3 | 377 | instance_put(inst); |
0597f268 HW |
378 | } |
379 | ||
0af5f6c1 HW |
380 | /* This is an inline function, we don't really care about a long |
381 | * list of arguments */ | |
601e68e1 | 382 | static inline int |
0597f268 | 383 | __build_packet_message(struct nfulnl_instance *inst, |
601e68e1 | 384 | const struct sk_buff *skb, |
0597f268 HW |
385 | unsigned int data_len, |
386 | unsigned int pf, | |
387 | unsigned int hooknum, | |
388 | const struct net_device *indev, | |
389 | const struct net_device *outdev, | |
390 | const struct nf_loginfo *li, | |
d7a5c324 | 391 | const char *prefix, unsigned int plen) |
0597f268 | 392 | { |
0597f268 HW |
393 | struct nfulnl_msg_packet_hdr pmsg; |
394 | struct nlmsghdr *nlh; | |
395 | struct nfgenmsg *nfmsg; | |
98a4a861 | 396 | __be32 tmp_uint; |
27a884dc | 397 | sk_buff_data_t old_tail = inst->skb->tail; |
0597f268 HW |
398 | |
399 | UDEBUG("entered\n"); | |
601e68e1 | 400 | |
601e68e1 | 401 | nlh = NLMSG_PUT(inst->skb, 0, 0, |
0597f268 HW |
402 | NFNL_SUBSYS_ULOG << 8 | NFULNL_MSG_PACKET, |
403 | sizeof(struct nfgenmsg)); | |
404 | nfmsg = NLMSG_DATA(nlh); | |
405 | nfmsg->nfgen_family = pf; | |
406 | nfmsg->version = NFNETLINK_V0; | |
407 | nfmsg->res_id = htons(inst->group_num); | |
408 | ||
febf0a43 | 409 | pmsg.hw_protocol = skb->protocol; |
0597f268 HW |
410 | pmsg.hook = hooknum; |
411 | ||
df6fb868 | 412 | NLA_PUT(inst->skb, NFULA_PACKET_HDR, sizeof(pmsg), &pmsg); |
0597f268 | 413 | |
d7a5c324 | 414 | if (prefix) |
df6fb868 | 415 | NLA_PUT(inst->skb, NFULA_PREFIX, plen, prefix); |
0597f268 HW |
416 | |
417 | if (indev) { | |
418 | tmp_uint = htonl(indev->ifindex); | |
fbcd923c | 419 | #ifndef CONFIG_BRIDGE_NETFILTER |
df6fb868 | 420 | NLA_PUT(inst->skb, NFULA_IFINDEX_INDEV, sizeof(tmp_uint), |
0597f268 | 421 | &tmp_uint); |
fbcd923c HW |
422 | #else |
423 | if (pf == PF_BRIDGE) { | |
424 | /* Case 1: outdev is physical input device, we need to | |
425 | * look for bridge group (when called from | |
426 | * netfilter_bridge) */ | |
df6fb868 | 427 | NLA_PUT(inst->skb, NFULA_IFINDEX_PHYSINDEV, |
fbcd923c HW |
428 | sizeof(tmp_uint), &tmp_uint); |
429 | /* this is the bridge group "brX" */ | |
430 | tmp_uint = htonl(indev->br_port->br->dev->ifindex); | |
df6fb868 | 431 | NLA_PUT(inst->skb, NFULA_IFINDEX_INDEV, |
fbcd923c HW |
432 | sizeof(tmp_uint), &tmp_uint); |
433 | } else { | |
434 | /* Case 2: indev is bridge group, we need to look for | |
435 | * physical device (when called from ipv4) */ | |
df6fb868 | 436 | NLA_PUT(inst->skb, NFULA_IFINDEX_INDEV, |
fbcd923c HW |
437 | sizeof(tmp_uint), &tmp_uint); |
438 | if (skb->nf_bridge && skb->nf_bridge->physindev) { | |
601e68e1 | 439 | tmp_uint = |
fbcd923c | 440 | htonl(skb->nf_bridge->physindev->ifindex); |
df6fb868 | 441 | NLA_PUT(inst->skb, NFULA_IFINDEX_PHYSINDEV, |
fbcd923c HW |
442 | sizeof(tmp_uint), &tmp_uint); |
443 | } | |
444 | } | |
445 | #endif | |
0597f268 HW |
446 | } |
447 | ||
448 | if (outdev) { | |
449 | tmp_uint = htonl(outdev->ifindex); | |
fbcd923c | 450 | #ifndef CONFIG_BRIDGE_NETFILTER |
df6fb868 | 451 | NLA_PUT(inst->skb, NFULA_IFINDEX_OUTDEV, sizeof(tmp_uint), |
0597f268 | 452 | &tmp_uint); |
fbcd923c HW |
453 | #else |
454 | if (pf == PF_BRIDGE) { | |
455 | /* Case 1: outdev is physical output device, we need to | |
456 | * look for bridge group (when called from | |
457 | * netfilter_bridge) */ | |
df6fb868 | 458 | NLA_PUT(inst->skb, NFULA_IFINDEX_PHYSOUTDEV, |
fbcd923c HW |
459 | sizeof(tmp_uint), &tmp_uint); |
460 | /* this is the bridge group "brX" */ | |
461 | tmp_uint = htonl(outdev->br_port->br->dev->ifindex); | |
df6fb868 | 462 | NLA_PUT(inst->skb, NFULA_IFINDEX_OUTDEV, |
fbcd923c HW |
463 | sizeof(tmp_uint), &tmp_uint); |
464 | } else { | |
465 | /* Case 2: indev is a bridge group, we need to look | |
466 | * for physical device (when called from ipv4) */ | |
df6fb868 | 467 | NLA_PUT(inst->skb, NFULA_IFINDEX_OUTDEV, |
fbcd923c | 468 | sizeof(tmp_uint), &tmp_uint); |
ba5dcee1 | 469 | if (skb->nf_bridge && skb->nf_bridge->physoutdev) { |
601e68e1 | 470 | tmp_uint = |
fbcd923c | 471 | htonl(skb->nf_bridge->physoutdev->ifindex); |
df6fb868 | 472 | NLA_PUT(inst->skb, NFULA_IFINDEX_PHYSOUTDEV, |
fbcd923c HW |
473 | sizeof(tmp_uint), &tmp_uint); |
474 | } | |
475 | } | |
476 | #endif | |
0597f268 HW |
477 | } |
478 | ||
82e91ffe TG |
479 | if (skb->mark) { |
480 | tmp_uint = htonl(skb->mark); | |
df6fb868 | 481 | NLA_PUT(inst->skb, NFULA_MARK, sizeof(tmp_uint), &tmp_uint); |
0597f268 HW |
482 | } |
483 | ||
b95cce35 | 484 | if (indev && skb->dev) { |
0597f268 | 485 | struct nfulnl_msg_packet_hw phw; |
b95cce35 SH |
486 | int len = dev_parse_header(skb, phw.hw_addr); |
487 | if (len > 0) { | |
488 | phw.hw_addrlen = htons(len); | |
df6fb868 | 489 | NLA_PUT(inst->skb, NFULA_HWADDR, sizeof(phw), &phw); |
b95cce35 | 490 | } |
0597f268 HW |
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 | |
df6fb868 | 499 | NLA_PUT(inst->skb, NFULA_TIMESTAMP, sizeof(ts), &ts); |
0597f268 HW |
500 | } |
501 | ||
502 | /* UID */ | |
503 | if (skb->sk) { | |
504 | read_lock_bh(&skb->sk->sk_callback_lock); | |
505 | if (skb->sk->sk_socket && skb->sk->sk_socket->file) { | |
98a4a861 | 506 | __be32 uid = htonl(skb->sk->sk_socket->file->f_uid); |
df6fb868 | 507 | /* need to unlock here since NLA_PUT may goto */ |
0597f268 | 508 | read_unlock_bh(&skb->sk->sk_callback_lock); |
df6fb868 | 509 | NLA_PUT(inst->skb, NFULA_UID, sizeof(uid), &uid); |
0597f268 HW |
510 | } else |
511 | read_unlock_bh(&skb->sk->sk_callback_lock); | |
512 | } | |
513 | ||
0af5f6c1 HW |
514 | /* local sequence number */ |
515 | if (inst->flags & NFULNL_CFG_F_SEQ) { | |
516 | tmp_uint = htonl(inst->seq++); | |
df6fb868 | 517 | NLA_PUT(inst->skb, NFULA_SEQ, sizeof(tmp_uint), &tmp_uint); |
0af5f6c1 HW |
518 | } |
519 | /* global sequence number */ | |
520 | if (inst->flags & NFULNL_CFG_F_SEQ_GLOBAL) { | |
7fdeaf68 | 521 | tmp_uint = htonl(atomic_inc_return(&global_seq)); |
df6fb868 | 522 | NLA_PUT(inst->skb, NFULA_SEQ_GLOBAL, sizeof(tmp_uint), &tmp_uint); |
0af5f6c1 HW |
523 | } |
524 | ||
0597f268 | 525 | if (data_len) { |
df6fb868 PM |
526 | struct nlattr *nla; |
527 | int size = nla_attr_size(data_len); | |
0597f268 | 528 | |
df6fb868 | 529 | if (skb_tailroom(inst->skb) < nla_total_size(data_len)) { |
0597f268 HW |
530 | printk(KERN_WARNING "nfnetlink_log: no tailroom!\n"); |
531 | goto nlmsg_failure; | |
532 | } | |
533 | ||
df6fb868 PM |
534 | nla = (struct nlattr *)skb_put(inst->skb, nla_total_size(data_len)); |
535 | nla->nla_type = NFULA_PAYLOAD; | |
536 | nla->nla_len = size; | |
0597f268 | 537 | |
df6fb868 | 538 | if (skb_copy_bits(skb, 0, nla_data(nla), data_len)) |
0597f268 HW |
539 | BUG(); |
540 | } | |
601e68e1 | 541 | |
0597f268 HW |
542 | nlh->nlmsg_len = inst->skb->tail - old_tail; |
543 | return 0; | |
544 | ||
545 | nlmsg_failure: | |
546 | UDEBUG("nlmsg_failure\n"); | |
df6fb868 | 547 | nla_put_failure: |
0597f268 HW |
548 | PRINTR(KERN_ERR "nfnetlink_log: error creating log nlmsg\n"); |
549 | return -1; | |
550 | } | |
551 | ||
552 | #define RCV_SKB_FAIL(err) do { netlink_ack(skb, nlh, (err)); return; } while (0) | |
553 | ||
554 | static struct nf_loginfo default_loginfo = { | |
555 | .type = NF_LOG_TYPE_ULOG, | |
556 | .u = { | |
557 | .ulog = { | |
558 | .copy_len = 0xffff, | |
559 | .group = 0, | |
560 | .qthreshold = 1, | |
561 | }, | |
562 | }, | |
563 | }; | |
564 | ||
565 | /* log handler for internal netfilter logging api */ | |
566 | static void | |
567 | nfulnl_log_packet(unsigned int pf, | |
568 | unsigned int hooknum, | |
569 | const struct sk_buff *skb, | |
570 | const struct net_device *in, | |
571 | const struct net_device *out, | |
572 | const struct nf_loginfo *li_user, | |
573 | const char *prefix) | |
574 | { | |
575 | unsigned int size, data_len; | |
576 | struct nfulnl_instance *inst; | |
577 | const struct nf_loginfo *li; | |
578 | unsigned int qthreshold; | |
d7a5c324 | 579 | unsigned int plen; |
0597f268 | 580 | |
601e68e1 | 581 | if (li_user && li_user->type == NF_LOG_TYPE_ULOG) |
0597f268 HW |
582 | li = li_user; |
583 | else | |
584 | li = &default_loginfo; | |
585 | ||
586 | inst = instance_lookup_get(li->u.ulog.group); | |
587 | if (!inst) | |
0597f268 | 588 | return; |
0597f268 | 589 | |
d7a5c324 PM |
590 | plen = 0; |
591 | if (prefix) | |
881dbfe8 | 592 | plen = strlen(prefix) + 1; |
d7a5c324 | 593 | |
0597f268 HW |
594 | /* FIXME: do we want to make the size calculation conditional based on |
595 | * what is actually present? way more branches and checks, but more | |
596 | * memory efficient... */ | |
df6fb868 PM |
597 | size = NLMSG_ALIGN(sizeof(struct nfgenmsg)) |
598 | + nla_total_size(sizeof(struct nfulnl_msg_packet_hdr)) | |
599 | + nla_total_size(sizeof(u_int32_t)) /* ifindex */ | |
600 | + nla_total_size(sizeof(u_int32_t)) /* ifindex */ | |
fbcd923c | 601 | #ifdef CONFIG_BRIDGE_NETFILTER |
df6fb868 PM |
602 | + nla_total_size(sizeof(u_int32_t)) /* ifindex */ |
603 | + nla_total_size(sizeof(u_int32_t)) /* ifindex */ | |
fbcd923c | 604 | #endif |
df6fb868 PM |
605 | + nla_total_size(sizeof(u_int32_t)) /* mark */ |
606 | + nla_total_size(sizeof(u_int32_t)) /* uid */ | |
607 | + nla_total_size(plen) /* prefix */ | |
608 | + nla_total_size(sizeof(struct nfulnl_msg_packet_hw)) | |
609 | + nla_total_size(sizeof(struct nfulnl_msg_packet_timestamp)); | |
0597f268 HW |
610 | |
611 | UDEBUG("initial size=%u\n", size); | |
612 | ||
613 | spin_lock_bh(&inst->lock); | |
614 | ||
0af5f6c1 | 615 | if (inst->flags & NFULNL_CFG_F_SEQ) |
df6fb868 | 616 | size += nla_total_size(sizeof(u_int32_t)); |
0af5f6c1 | 617 | if (inst->flags & NFULNL_CFG_F_SEQ_GLOBAL) |
df6fb868 | 618 | size += nla_total_size(sizeof(u_int32_t)); |
0af5f6c1 | 619 | |
0597f268 HW |
620 | qthreshold = inst->qthreshold; |
621 | /* per-rule qthreshold overrides per-instance */ | |
622 | if (qthreshold > li->u.ulog.qthreshold) | |
623 | qthreshold = li->u.ulog.qthreshold; | |
601e68e1 | 624 | |
0597f268 HW |
625 | switch (inst->copy_mode) { |
626 | case NFULNL_COPY_META: | |
627 | case NFULNL_COPY_NONE: | |
628 | data_len = 0; | |
629 | break; | |
601e68e1 | 630 | |
0597f268 | 631 | case NFULNL_COPY_PACKET: |
601e68e1 | 632 | if (inst->copy_range == 0 |
0597f268 HW |
633 | || inst->copy_range > skb->len) |
634 | data_len = skb->len; | |
635 | else | |
636 | data_len = inst->copy_range; | |
601e68e1 | 637 | |
df6fb868 | 638 | size += nla_total_size(data_len); |
0597f268 HW |
639 | UDEBUG("copy_packet, therefore size now %u\n", size); |
640 | break; | |
601e68e1 | 641 | |
0597f268 | 642 | default: |
55b5a91e | 643 | goto unlock_and_release; |
0597f268 HW |
644 | } |
645 | ||
55b5a91e | 646 | if (inst->qlen >= qthreshold || |
29c5d4af EL |
647 | (inst->skb && size > |
648 | skb_tailroom(inst->skb) - sizeof(struct nfgenmsg))) { | |
0597f268 HW |
649 | /* either the queue len is too high or we don't have |
650 | * enough room in the skb left. flush to userspace. */ | |
651 | UDEBUG("flushing old skb\n"); | |
652 | ||
b4d6202b MM |
653 | /* timer "holds" one reference (we have another one) */ |
654 | if (del_timer(&inst->timer)) | |
655 | instance_put(inst); | |
0597f268 | 656 | __nfulnl_send(inst); |
55b5a91e | 657 | } |
0597f268 | 658 | |
55b5a91e MM |
659 | if (!inst->skb) { |
660 | inst->skb = nfulnl_alloc_skb(inst->nlbufsiz, size); | |
661 | if (!inst->skb) | |
0597f268 | 662 | goto alloc_failure; |
0597f268 HW |
663 | } |
664 | ||
665 | UDEBUG("qlen %d, qthreshold %d\n", inst->qlen, qthreshold); | |
666 | inst->qlen++; | |
667 | ||
668 | __build_packet_message(inst, skb, data_len, pf, | |
d7a5c324 | 669 | hooknum, in, out, li, prefix, plen); |
0597f268 HW |
670 | |
671 | /* timer_pending always called within inst->lock, so there | |
672 | * is no chance of a race here */ | |
673 | if (!timer_pending(&inst->timer)) { | |
674 | instance_get(inst); | |
675 | inst->timer.expires = jiffies + (inst->flushtimeout*HZ/100); | |
676 | add_timer(&inst->timer); | |
677 | } | |
0597f268 | 678 | |
ed32abea MM |
679 | unlock_and_release: |
680 | spin_unlock_bh(&inst->lock); | |
681 | instance_put(inst); | |
0597f268 HW |
682 | return; |
683 | ||
684 | alloc_failure: | |
0597f268 HW |
685 | UDEBUG("error allocating skb\n"); |
686 | /* FIXME: statistics */ | |
ed32abea | 687 | goto unlock_and_release; |
0597f268 HW |
688 | } |
689 | ||
690 | static int | |
691 | nfulnl_rcv_nl_event(struct notifier_block *this, | |
692 | unsigned long event, void *ptr) | |
693 | { | |
694 | struct netlink_notify *n = ptr; | |
695 | ||
696 | if (event == NETLINK_URELEASE && | |
697 | n->protocol == NETLINK_NETFILTER && n->pid) { | |
698 | int i; | |
699 | ||
700 | /* destroy all instances for this pid */ | |
701 | write_lock_bh(&instances_lock); | |
702 | for (i = 0; i < INSTANCE_BUCKETS; i++) { | |
703 | struct hlist_node *tmp, *t2; | |
704 | struct nfulnl_instance *inst; | |
705 | struct hlist_head *head = &instance_table[i]; | |
706 | ||
707 | hlist_for_each_entry_safe(inst, tmp, t2, head, hlist) { | |
708 | UDEBUG("node = %p\n", inst); | |
b4b51029 EB |
709 | if ((n->net == &init_net) && |
710 | (n->pid == inst->peer_pid)) | |
0597f268 HW |
711 | __instance_destroy(inst); |
712 | } | |
713 | } | |
714 | write_unlock_bh(&instances_lock); | |
715 | } | |
716 | return NOTIFY_DONE; | |
717 | } | |
718 | ||
719 | static struct notifier_block nfulnl_rtnl_notifier = { | |
720 | .notifier_call = nfulnl_rcv_nl_event, | |
721 | }; | |
722 | ||
723 | static int | |
724 | nfulnl_recv_unsupp(struct sock *ctnl, struct sk_buff *skb, | |
df6fb868 | 725 | struct nlmsghdr *nlh, struct nlattr *nfqa[]) |
0597f268 HW |
726 | { |
727 | return -ENOTSUPP; | |
728 | } | |
729 | ||
730 | static struct nf_logger nfulnl_logger = { | |
731 | .name = "nfnetlink_log", | |
732 | .logfn = &nfulnl_log_packet, | |
733 | .me = THIS_MODULE, | |
734 | }; | |
735 | ||
df6fb868 PM |
736 | static const int nfula_min[NFULA_MAX+1] = { |
737 | [NFULA_PACKET_HDR] = sizeof(struct nfulnl_msg_packet_hdr), | |
738 | [NFULA_MARK] = sizeof(u_int32_t), | |
739 | [NFULA_TIMESTAMP] = sizeof(struct nfulnl_msg_packet_timestamp), | |
740 | [NFULA_IFINDEX_INDEV] = sizeof(u_int32_t), | |
741 | [NFULA_IFINDEX_OUTDEV] = sizeof(u_int32_t), | |
742 | [NFULA_IFINDEX_PHYSINDEV] = sizeof(u_int32_t), | |
743 | [NFULA_IFINDEX_PHYSOUTDEV] = sizeof(u_int32_t), | |
744 | [NFULA_HWADDR] = sizeof(struct nfulnl_msg_packet_hw), | |
745 | [NFULA_PAYLOAD] = 0, | |
746 | [NFULA_PREFIX] = 0, | |
747 | [NFULA_UID] = sizeof(u_int32_t), | |
748 | [NFULA_SEQ] = sizeof(u_int32_t), | |
749 | [NFULA_SEQ_GLOBAL] = sizeof(u_int32_t), | |
0597f268 HW |
750 | }; |
751 | ||
df6fb868 PM |
752 | static const int nfula_cfg_min[NFULA_CFG_MAX+1] = { |
753 | [NFULA_CFG_CMD] = sizeof(struct nfulnl_msg_config_cmd), | |
754 | [NFULA_CFG_MODE] = sizeof(struct nfulnl_msg_config_mode), | |
755 | [NFULA_CFG_TIMEOUT] = sizeof(u_int32_t), | |
756 | [NFULA_CFG_QTHRESH] = sizeof(u_int32_t), | |
757 | [NFULA_CFG_NLBUFSIZ] = sizeof(u_int32_t), | |
758 | [NFULA_CFG_FLAGS] = sizeof(u_int16_t), | |
0597f268 HW |
759 | }; |
760 | ||
761 | static int | |
762 | nfulnl_recv_config(struct sock *ctnl, struct sk_buff *skb, | |
df6fb868 | 763 | struct nlmsghdr *nlh, struct nlattr *nfula[]) |
0597f268 HW |
764 | { |
765 | struct nfgenmsg *nfmsg = NLMSG_DATA(nlh); | |
766 | u_int16_t group_num = ntohs(nfmsg->res_id); | |
767 | struct nfulnl_instance *inst; | |
768 | int ret = 0; | |
769 | ||
770 | UDEBUG("entering for msg %u\n", NFNL_MSG_TYPE(nlh->nlmsg_type)); | |
771 | ||
fdf70832 | 772 | if (nlattr_bad_size(nfula, NFULA_CFG_MAX, nfula_cfg_min)) { |
0597f268 HW |
773 | UDEBUG("bad attribute size\n"); |
774 | return -EINVAL; | |
775 | } | |
776 | ||
777 | inst = instance_lookup_get(group_num); | |
df6fb868 | 778 | if (nfula[NFULA_CFG_CMD]) { |
0597f268 HW |
779 | u_int8_t pf = nfmsg->nfgen_family; |
780 | struct nfulnl_msg_config_cmd *cmd; | |
df6fb868 | 781 | cmd = nla_data(nfula[NFULA_CFG_CMD]); |
0597f268 HW |
782 | UDEBUG("found CFG_CMD for\n"); |
783 | ||
784 | switch (cmd->command) { | |
785 | case NFULNL_CFG_CMD_BIND: | |
786 | if (inst) { | |
787 | ret = -EBUSY; | |
788 | goto out_put; | |
789 | } | |
790 | ||
791 | inst = instance_create(group_num, | |
792 | NETLINK_CB(skb).pid); | |
793 | if (!inst) { | |
794 | ret = -EINVAL; | |
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 | ||
804 | if (inst->peer_pid != NETLINK_CB(skb).pid) { | |
805 | ret = -EPERM; | |
806 | goto out_put; | |
807 | } | |
808 | ||
809 | instance_destroy(inst); | |
9a36e8c2 | 810 | goto out; |
0597f268 HW |
811 | case NFULNL_CFG_CMD_PF_BIND: |
812 | UDEBUG("registering log handler for pf=%u\n", pf); | |
813 | ret = nf_log_register(pf, &nfulnl_logger); | |
814 | break; | |
815 | case NFULNL_CFG_CMD_PF_UNBIND: | |
816 | UDEBUG("unregistering log handler for pf=%u\n", pf); | |
817 | /* This is a bug and a feature. We cannot unregister | |
818 | * other handlers, like nfnetlink_inst can */ | |
819 | nf_log_unregister_pf(pf); | |
820 | break; | |
821 | default: | |
822 | ret = -EINVAL; | |
823 | break; | |
824 | } | |
dd16704e MM |
825 | |
826 | if (!inst) | |
827 | goto out; | |
0597f268 HW |
828 | } else { |
829 | if (!inst) { | |
830 | UDEBUG("no config command, and no instance for " | |
831 | "group=%u pid=%u =>ENOENT\n", | |
832 | group_num, NETLINK_CB(skb).pid); | |
833 | ret = -ENOENT; | |
f414c16c | 834 | goto out; |
0597f268 HW |
835 | } |
836 | ||
837 | if (inst->peer_pid != NETLINK_CB(skb).pid) { | |
838 | UDEBUG("no config command, and wrong pid\n"); | |
839 | ret = -EPERM; | |
840 | goto out_put; | |
841 | } | |
842 | } | |
843 | ||
df6fb868 | 844 | if (nfula[NFULA_CFG_MODE]) { |
0597f268 | 845 | struct nfulnl_msg_config_mode *params; |
df6fb868 | 846 | params = nla_data(nfula[NFULA_CFG_MODE]); |
0597f268 HW |
847 | |
848 | nfulnl_set_mode(inst, params->copy_mode, | |
d1208b99 | 849 | ntohl(params->copy_range)); |
0597f268 HW |
850 | } |
851 | ||
df6fb868 | 852 | if (nfula[NFULA_CFG_TIMEOUT]) { |
98a4a861 | 853 | __be32 timeout = |
df6fb868 | 854 | *(__be32 *)nla_data(nfula[NFULA_CFG_TIMEOUT]); |
0597f268 HW |
855 | |
856 | nfulnl_set_timeout(inst, ntohl(timeout)); | |
857 | } | |
858 | ||
df6fb868 | 859 | if (nfula[NFULA_CFG_NLBUFSIZ]) { |
98a4a861 | 860 | __be32 nlbufsiz = |
df6fb868 | 861 | *(__be32 *)nla_data(nfula[NFULA_CFG_NLBUFSIZ]); |
0597f268 HW |
862 | |
863 | nfulnl_set_nlbufsiz(inst, ntohl(nlbufsiz)); | |
864 | } | |
865 | ||
df6fb868 | 866 | if (nfula[NFULA_CFG_QTHRESH]) { |
7ac00a24 | 867 | __be32 qthresh = |
df6fb868 | 868 | *(__be32 *)nla_data(nfula[NFULA_CFG_QTHRESH]); |
0597f268 HW |
869 | |
870 | nfulnl_set_qthresh(inst, ntohl(qthresh)); | |
871 | } | |
872 | ||
df6fb868 | 873 | if (nfula[NFULA_CFG_FLAGS]) { |
98a4a861 | 874 | __be16 flags = |
df6fb868 | 875 | *(__be16 *)nla_data(nfula[NFULA_CFG_FLAGS]); |
ee433530 | 876 | nfulnl_set_flags(inst, ntohs(flags)); |
0af5f6c1 HW |
877 | } |
878 | ||
0597f268 HW |
879 | out_put: |
880 | instance_put(inst); | |
dd16704e | 881 | out: |
0597f268 HW |
882 | return ret; |
883 | } | |
884 | ||
7c8d4cb4 | 885 | static const struct nfnl_callback nfulnl_cb[NFULNL_MSG_MAX] = { |
0597f268 | 886 | [NFULNL_MSG_PACKET] = { .call = nfulnl_recv_unsupp, |
37d2e7a2 | 887 | .attr_count = NFULA_MAX, }, |
0597f268 | 888 | [NFULNL_MSG_CONFIG] = { .call = nfulnl_recv_config, |
37d2e7a2 | 889 | .attr_count = NFULA_CFG_MAX, }, |
0597f268 HW |
890 | }; |
891 | ||
7c8d4cb4 | 892 | static const struct nfnetlink_subsystem nfulnl_subsys = { |
0597f268 HW |
893 | .name = "log", |
894 | .subsys_id = NFNL_SUBSYS_ULOG, | |
895 | .cb_count = NFULNL_MSG_MAX, | |
0597f268 HW |
896 | .cb = nfulnl_cb, |
897 | }; | |
898 | ||
899 | #ifdef CONFIG_PROC_FS | |
900 | struct iter_state { | |
901 | unsigned int bucket; | |
902 | }; | |
903 | ||
f76cdcee | 904 | static struct hlist_node *get_first(struct iter_state *st) |
0597f268 | 905 | { |
0597f268 HW |
906 | if (!st) |
907 | return NULL; | |
908 | ||
909 | for (st->bucket = 0; st->bucket < INSTANCE_BUCKETS; st->bucket++) { | |
910 | if (!hlist_empty(&instance_table[st->bucket])) | |
911 | return instance_table[st->bucket].first; | |
912 | } | |
913 | return NULL; | |
914 | } | |
915 | ||
f76cdcee | 916 | static struct hlist_node *get_next(struct iter_state *st, struct hlist_node *h) |
0597f268 | 917 | { |
0597f268 HW |
918 | h = h->next; |
919 | while (!h) { | |
920 | if (++st->bucket >= INSTANCE_BUCKETS) | |
921 | return NULL; | |
922 | ||
923 | h = instance_table[st->bucket].first; | |
924 | } | |
925 | return h; | |
926 | } | |
927 | ||
f76cdcee | 928 | static struct hlist_node *get_idx(struct iter_state *st, loff_t pos) |
0597f268 HW |
929 | { |
930 | struct hlist_node *head; | |
f76cdcee | 931 | head = get_first(st); |
0597f268 HW |
932 | |
933 | if (head) | |
f76cdcee | 934 | while (pos && (head = get_next(st, head))) |
0597f268 HW |
935 | pos--; |
936 | return pos ? NULL : head; | |
937 | } | |
938 | ||
939 | static void *seq_start(struct seq_file *seq, loff_t *pos) | |
940 | { | |
941 | read_lock_bh(&instances_lock); | |
f76cdcee | 942 | return get_idx(seq->private, *pos); |
0597f268 HW |
943 | } |
944 | ||
945 | static void *seq_next(struct seq_file *s, void *v, loff_t *pos) | |
946 | { | |
947 | (*pos)++; | |
f76cdcee | 948 | return get_next(s->private, v); |
0597f268 HW |
949 | } |
950 | ||
951 | static void seq_stop(struct seq_file *s, void *v) | |
952 | { | |
953 | read_unlock_bh(&instances_lock); | |
954 | } | |
955 | ||
956 | static int seq_show(struct seq_file *s, void *v) | |
957 | { | |
958 | const struct nfulnl_instance *inst = v; | |
959 | ||
601e68e1 | 960 | return seq_printf(s, "%5d %6d %5d %1d %5d %6d %2d\n", |
0597f268 | 961 | inst->group_num, |
601e68e1 | 962 | inst->peer_pid, inst->qlen, |
0597f268 HW |
963 | inst->copy_mode, inst->copy_range, |
964 | inst->flushtimeout, atomic_read(&inst->use)); | |
965 | } | |
966 | ||
56b3d975 | 967 | static const struct seq_operations nful_seq_ops = { |
0597f268 HW |
968 | .start = seq_start, |
969 | .next = seq_next, | |
970 | .stop = seq_stop, | |
971 | .show = seq_show, | |
972 | }; | |
973 | ||
974 | static int nful_open(struct inode *inode, struct file *file) | |
975 | { | |
976 | struct seq_file *seq; | |
977 | struct iter_state *is; | |
978 | int ret; | |
979 | ||
10dfdc69 | 980 | is = kzalloc(sizeof(*is), GFP_KERNEL); |
0597f268 HW |
981 | if (!is) |
982 | return -ENOMEM; | |
0597f268 HW |
983 | ret = seq_open(file, &nful_seq_ops); |
984 | if (ret < 0) | |
985 | goto out_free; | |
986 | seq = file->private_data; | |
987 | seq->private = is; | |
988 | return ret; | |
989 | out_free: | |
990 | kfree(is); | |
991 | return ret; | |
992 | } | |
993 | ||
da7071d7 | 994 | static const struct file_operations nful_file_ops = { |
0597f268 HW |
995 | .owner = THIS_MODULE, |
996 | .open = nful_open, | |
997 | .read = seq_read, | |
998 | .llseek = seq_lseek, | |
999 | .release = seq_release_private, | |
1000 | }; | |
1001 | ||
1002 | #endif /* PROC_FS */ | |
1003 | ||
32292a7f | 1004 | static int __init nfnetlink_log_init(void) |
0597f268 HW |
1005 | { |
1006 | int i, status = -ENOMEM; | |
1007 | #ifdef CONFIG_PROC_FS | |
1008 | struct proc_dir_entry *proc_nful; | |
1009 | #endif | |
601e68e1 | 1010 | |
0597f268 HW |
1011 | for (i = 0; i < INSTANCE_BUCKETS; i++) |
1012 | INIT_HLIST_HEAD(&instance_table[i]); | |
601e68e1 | 1013 | |
0597f268 HW |
1014 | /* it's not really all that important to have a random value, so |
1015 | * we can do this from the init function, even if there hasn't | |
1016 | * been that much entropy yet */ | |
1017 | get_random_bytes(&hash_init, sizeof(hash_init)); | |
1018 | ||
1019 | netlink_register_notifier(&nfulnl_rtnl_notifier); | |
1020 | status = nfnetlink_subsys_register(&nfulnl_subsys); | |
1021 | if (status < 0) { | |
1022 | printk(KERN_ERR "log: failed to create netlink socket\n"); | |
1023 | goto cleanup_netlink_notifier; | |
1024 | } | |
1025 | ||
1026 | #ifdef CONFIG_PROC_FS | |
1027 | proc_nful = create_proc_entry("nfnetlink_log", 0440, | |
1028 | proc_net_netfilter); | |
1029 | if (!proc_nful) | |
1030 | goto cleanup_subsys; | |
1031 | proc_nful->proc_fops = &nful_file_ops; | |
1032 | #endif | |
0597f268 HW |
1033 | return status; |
1034 | ||
0597f268 | 1035 | #ifdef CONFIG_PROC_FS |
0597f268 | 1036 | cleanup_subsys: |
0597f268 | 1037 | nfnetlink_subsys_unregister(&nfulnl_subsys); |
32292a7f | 1038 | #endif |
0597f268 HW |
1039 | cleanup_netlink_notifier: |
1040 | netlink_unregister_notifier(&nfulnl_rtnl_notifier); | |
1041 | return status; | |
1042 | } | |
1043 | ||
65b4b4e8 | 1044 | static void __exit nfnetlink_log_fini(void) |
0597f268 | 1045 | { |
e92ad99c | 1046 | nf_log_unregister(&nfulnl_logger); |
32292a7f PM |
1047 | #ifdef CONFIG_PROC_FS |
1048 | remove_proc_entry("nfnetlink_log", proc_net_netfilter); | |
1049 | #endif | |
1050 | nfnetlink_subsys_unregister(&nfulnl_subsys); | |
1051 | netlink_unregister_notifier(&nfulnl_rtnl_notifier); | |
0597f268 HW |
1052 | } |
1053 | ||
1054 | MODULE_DESCRIPTION("netfilter userspace logging"); | |
1055 | MODULE_AUTHOR("Harald Welte <laforge@netfilter.org>"); | |
1056 | MODULE_LICENSE("GPL"); | |
f682faef | 1057 | MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_ULOG); |
0597f268 | 1058 | |
65b4b4e8 AM |
1059 | module_init(nfnetlink_log_init); |
1060 | module_exit(nfnetlink_log_fini); |