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> | |
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 HW |
57 | struct timer_list timer; |
58 | int peer_pid; /* PID of the peer process */ | |
59 | ||
60 | /* configurable parameters */ | |
61 | unsigned int flushtimeout; /* timeout until queue flush */ | |
62 | unsigned int nlbufsiz; /* netlink buffer allocation size */ | |
63 | unsigned int qthreshold; /* threshold of the queue */ | |
64 | u_int32_t copy_range; | |
0af5f6c1 | 65 | u_int32_t seq; /* instance-local sequential counter */ |
0597f268 | 66 | u_int16_t group_num; /* number of this queue */ |
0af5f6c1 | 67 | u_int16_t flags; |
601e68e1 | 68 | u_int8_t copy_mode; |
bed1be20 | 69 | struct rcu_head rcu; |
0597f268 HW |
70 | }; |
71 | ||
bed1be20 | 72 | static DEFINE_SPINLOCK(instances_lock); |
0af5f6c1 | 73 | static atomic_t global_seq; |
0597f268 HW |
74 | |
75 | #define INSTANCE_BUCKETS 16 | |
76 | static struct hlist_head instance_table[INSTANCE_BUCKETS]; | |
77 | static unsigned int hash_init; | |
78 | ||
79 | static inline u_int8_t instance_hashfn(u_int16_t group_num) | |
80 | { | |
81 | return ((group_num & 0xff) % INSTANCE_BUCKETS); | |
82 | } | |
83 | ||
84 | static struct nfulnl_instance * | |
85 | __instance_lookup(u_int16_t group_num) | |
86 | { | |
87 | struct hlist_head *head; | |
88 | struct hlist_node *pos; | |
89 | struct nfulnl_instance *inst; | |
90 | ||
0597f268 | 91 | head = &instance_table[instance_hashfn(group_num)]; |
bed1be20 | 92 | hlist_for_each_entry_rcu(inst, pos, head, hlist) { |
0597f268 HW |
93 | if (inst->group_num == group_num) |
94 | return inst; | |
95 | } | |
96 | return NULL; | |
97 | } | |
98 | ||
99 | static inline void | |
100 | instance_get(struct nfulnl_instance *inst) | |
101 | { | |
102 | atomic_inc(&inst->use); | |
103 | } | |
104 | ||
105 | static struct nfulnl_instance * | |
106 | instance_lookup_get(u_int16_t group_num) | |
107 | { | |
108 | struct nfulnl_instance *inst; | |
109 | ||
bed1be20 | 110 | rcu_read_lock_bh(); |
0597f268 | 111 | inst = __instance_lookup(group_num); |
f5c5440d ED |
112 | if (inst && !atomic_inc_not_zero(&inst->use)) |
113 | inst = NULL; | |
bed1be20 | 114 | rcu_read_unlock_bh(); |
0597f268 HW |
115 | |
116 | return inst; | |
117 | } | |
118 | ||
bed1be20 ED |
119 | static void nfulnl_instance_free_rcu(struct rcu_head *head) |
120 | { | |
121 | kfree(container_of(head, struct nfulnl_instance, rcu)); | |
122 | module_put(THIS_MODULE); | |
123 | } | |
124 | ||
0597f268 HW |
125 | static void |
126 | instance_put(struct nfulnl_instance *inst) | |
127 | { | |
bed1be20 ED |
128 | if (inst && atomic_dec_and_test(&inst->use)) |
129 | call_rcu_bh(&inst->rcu, nfulnl_instance_free_rcu); | |
0597f268 HW |
130 | } |
131 | ||
132 | static void nfulnl_timer(unsigned long data); | |
133 | ||
134 | static struct nfulnl_instance * | |
135 | instance_create(u_int16_t group_num, int pid) | |
136 | { | |
137 | struct nfulnl_instance *inst; | |
baab2ce7 | 138 | int err; |
0597f268 | 139 | |
bed1be20 | 140 | spin_lock_bh(&instances_lock); |
0597f268 | 141 | if (__instance_lookup(group_num)) { |
baab2ce7 | 142 | err = -EEXIST; |
0597f268 HW |
143 | goto out_unlock; |
144 | } | |
145 | ||
10dfdc69 | 146 | inst = kzalloc(sizeof(*inst), GFP_ATOMIC); |
baab2ce7 PM |
147 | if (!inst) { |
148 | err = -ENOMEM; | |
0597f268 | 149 | goto out_unlock; |
baab2ce7 | 150 | } |
0597f268 | 151 | |
aace57e0 MM |
152 | if (!try_module_get(THIS_MODULE)) { |
153 | kfree(inst); | |
baab2ce7 | 154 | err = -EAGAIN; |
aace57e0 MM |
155 | goto out_unlock; |
156 | } | |
157 | ||
0597f268 | 158 | INIT_HLIST_NODE(&inst->hlist); |
181a46a5 | 159 | spin_lock_init(&inst->lock); |
0597f268 HW |
160 | /* needs to be two, since we _put() after creation */ |
161 | atomic_set(&inst->use, 2); | |
162 | ||
e6f689db | 163 | setup_timer(&inst->timer, nfulnl_timer, (unsigned long)inst); |
0597f268 HW |
164 | |
165 | inst->peer_pid = pid; | |
166 | inst->group_num = group_num; | |
167 | ||
168 | inst->qthreshold = NFULNL_QTHRESH_DEFAULT; | |
169 | inst->flushtimeout = NFULNL_TIMEOUT_DEFAULT; | |
170 | inst->nlbufsiz = NFULNL_NLBUFSIZ_DEFAULT; | |
171 | inst->copy_mode = NFULNL_COPY_PACKET; | |
6b6ec99a | 172 | inst->copy_range = NFULNL_COPY_RANGE_MAX; |
0597f268 | 173 | |
f5c5440d | 174 | hlist_add_head_rcu(&inst->hlist, |
0597f268 HW |
175 | &instance_table[instance_hashfn(group_num)]); |
176 | ||
bed1be20 | 177 | spin_unlock_bh(&instances_lock); |
0597f268 HW |
178 | |
179 | return inst; | |
180 | ||
0597f268 | 181 | out_unlock: |
bed1be20 | 182 | spin_unlock_bh(&instances_lock); |
baab2ce7 | 183 | return ERR_PTR(err); |
0597f268 HW |
184 | } |
185 | ||
e3567061 | 186 | static void __nfulnl_flush(struct nfulnl_instance *inst); |
0597f268 | 187 | |
f5c5440d | 188 | /* called with BH disabled */ |
0597f268 | 189 | static void |
9afdb00c | 190 | __instance_destroy(struct nfulnl_instance *inst) |
0597f268 HW |
191 | { |
192 | /* first pull it out of the global list */ | |
f5c5440d | 193 | hlist_del_rcu(&inst->hlist); |
0597f268 | 194 | |
0597f268 HW |
195 | /* then flush all pending packets from skb */ |
196 | ||
f5c5440d ED |
197 | spin_lock(&inst->lock); |
198 | ||
199 | /* lockless readers wont be able to use us */ | |
200 | inst->copy_mode = NFULNL_COPY_DISABLED; | |
201 | ||
e3567061 MM |
202 | if (inst->skb) |
203 | __nfulnl_flush(inst); | |
f5c5440d | 204 | spin_unlock(&inst->lock); |
0597f268 HW |
205 | |
206 | /* and finally put the refcount */ | |
207 | instance_put(inst); | |
0597f268 HW |
208 | } |
209 | ||
0597f268 HW |
210 | static inline void |
211 | instance_destroy(struct nfulnl_instance *inst) | |
212 | { | |
bed1be20 | 213 | spin_lock_bh(&instances_lock); |
9afdb00c | 214 | __instance_destroy(inst); |
bed1be20 | 215 | spin_unlock_bh(&instances_lock); |
0597f268 HW |
216 | } |
217 | ||
218 | static int | |
219 | nfulnl_set_mode(struct nfulnl_instance *inst, u_int8_t mode, | |
220 | unsigned int range) | |
221 | { | |
222 | int status = 0; | |
223 | ||
224 | spin_lock_bh(&inst->lock); | |
601e68e1 | 225 | |
0597f268 HW |
226 | switch (mode) { |
227 | case NFULNL_COPY_NONE: | |
228 | case NFULNL_COPY_META: | |
229 | inst->copy_mode = mode; | |
230 | inst->copy_range = 0; | |
231 | break; | |
601e68e1 | 232 | |
0597f268 HW |
233 | case NFULNL_COPY_PACKET: |
234 | inst->copy_mode = mode; | |
6b6ec99a MM |
235 | inst->copy_range = min_t(unsigned int, |
236 | range, NFULNL_COPY_RANGE_MAX); | |
0597f268 | 237 | break; |
601e68e1 | 238 | |
0597f268 HW |
239 | default: |
240 | status = -EINVAL; | |
241 | break; | |
242 | } | |
243 | ||
244 | spin_unlock_bh(&inst->lock); | |
245 | ||
246 | return status; | |
247 | } | |
248 | ||
249 | static int | |
250 | nfulnl_set_nlbufsiz(struct nfulnl_instance *inst, u_int32_t nlbufsiz) | |
251 | { | |
252 | int status; | |
253 | ||
254 | spin_lock_bh(&inst->lock); | |
255 | if (nlbufsiz < NFULNL_NLBUFSIZ_DEFAULT) | |
256 | status = -ERANGE; | |
257 | else if (nlbufsiz > 131072) | |
258 | status = -ERANGE; | |
259 | else { | |
260 | inst->nlbufsiz = nlbufsiz; | |
261 | status = 0; | |
262 | } | |
263 | spin_unlock_bh(&inst->lock); | |
264 | ||
265 | return status; | |
266 | } | |
267 | ||
268 | static int | |
269 | nfulnl_set_timeout(struct nfulnl_instance *inst, u_int32_t timeout) | |
270 | { | |
271 | spin_lock_bh(&inst->lock); | |
272 | inst->flushtimeout = timeout; | |
273 | spin_unlock_bh(&inst->lock); | |
274 | ||
275 | return 0; | |
276 | } | |
277 | ||
278 | static int | |
279 | nfulnl_set_qthresh(struct nfulnl_instance *inst, u_int32_t qthresh) | |
280 | { | |
281 | spin_lock_bh(&inst->lock); | |
282 | inst->qthreshold = qthresh; | |
283 | spin_unlock_bh(&inst->lock); | |
284 | ||
285 | return 0; | |
286 | } | |
287 | ||
0af5f6c1 HW |
288 | static int |
289 | nfulnl_set_flags(struct nfulnl_instance *inst, u_int16_t flags) | |
290 | { | |
291 | spin_lock_bh(&inst->lock); | |
ee433530 | 292 | inst->flags = flags; |
0af5f6c1 HW |
293 | spin_unlock_bh(&inst->lock); |
294 | ||
295 | return 0; | |
296 | } | |
297 | ||
c6a8f648 MM |
298 | static struct sk_buff * |
299 | nfulnl_alloc_skb(unsigned int inst_size, unsigned int pkt_size) | |
0597f268 HW |
300 | { |
301 | struct sk_buff *skb; | |
ad2ad0f9 | 302 | unsigned int n; |
0597f268 | 303 | |
0597f268 HW |
304 | /* alloc skb which should be big enough for a whole multipart |
305 | * message. WARNING: has to be <= 128k due to slab restrictions */ | |
306 | ||
ad2ad0f9 PM |
307 | n = max(inst_size, pkt_size); |
308 | skb = alloc_skb(n, GFP_ATOMIC); | |
0597f268 | 309 | if (!skb) { |
ad2ad0f9 PM |
310 | if (n > pkt_size) { |
311 | /* try to allocate only as much as we need for current | |
312 | * packet */ | |
0597f268 | 313 | |
ad2ad0f9 PM |
314 | skb = alloc_skb(pkt_size, GFP_ATOMIC); |
315 | if (!skb) | |
0a9ee813 JP |
316 | pr_err("nfnetlink_log: can't even alloc %u bytes\n", |
317 | pkt_size); | |
ad2ad0f9 | 318 | } |
0597f268 HW |
319 | } |
320 | ||
321 | return skb; | |
322 | } | |
323 | ||
324 | static int | |
325 | __nfulnl_send(struct nfulnl_instance *inst) | |
326 | { | |
29c5d4af | 327 | int status = -1; |
0597f268 | 328 | |
d550d095 DM |
329 | if (inst->qlen > 1) { |
330 | struct nlmsghdr *nlh = nlmsg_put(inst->skb, 0, 0, | |
331 | NLMSG_DONE, | |
332 | sizeof(struct nfgenmsg), | |
333 | 0); | |
334 | if (!nlh) | |
335 | goto out; | |
336 | } | |
cd8c20b6 AD |
337 | status = nfnetlink_unicast(inst->skb, &init_net, inst->peer_pid, |
338 | MSG_DONTWAIT); | |
0597f268 HW |
339 | |
340 | inst->qlen = 0; | |
341 | inst->skb = NULL; | |
d550d095 | 342 | out: |
0597f268 HW |
343 | return status; |
344 | } | |
345 | ||
e3567061 MM |
346 | static void |
347 | __nfulnl_flush(struct nfulnl_instance *inst) | |
348 | { | |
349 | /* timer holds a reference */ | |
350 | if (del_timer(&inst->timer)) | |
351 | instance_put(inst); | |
352 | if (inst->skb) | |
353 | __nfulnl_send(inst); | |
354 | } | |
355 | ||
c6a8f648 MM |
356 | static void |
357 | nfulnl_timer(unsigned long data) | |
0597f268 | 358 | { |
601e68e1 | 359 | struct nfulnl_instance *inst = (struct nfulnl_instance *)data; |
0597f268 | 360 | |
0597f268 | 361 | spin_lock_bh(&inst->lock); |
370e6a87 MM |
362 | if (inst->skb) |
363 | __nfulnl_send(inst); | |
0597f268 | 364 | spin_unlock_bh(&inst->lock); |
05f7b7b3 | 365 | instance_put(inst); |
0597f268 HW |
366 | } |
367 | ||
0af5f6c1 HW |
368 | /* This is an inline function, we don't really care about a long |
369 | * list of arguments */ | |
601e68e1 | 370 | static inline int |
0597f268 | 371 | __build_packet_message(struct nfulnl_instance *inst, |
601e68e1 | 372 | const struct sk_buff *skb, |
0597f268 | 373 | unsigned int data_len, |
76108cea | 374 | u_int8_t pf, |
0597f268 HW |
375 | unsigned int hooknum, |
376 | const struct net_device *indev, | |
377 | const struct net_device *outdev, | |
d7a5c324 | 378 | const char *prefix, unsigned int plen) |
0597f268 | 379 | { |
0597f268 HW |
380 | struct nfulnl_msg_packet_hdr pmsg; |
381 | struct nlmsghdr *nlh; | |
382 | struct nfgenmsg *nfmsg; | |
27a884dc | 383 | sk_buff_data_t old_tail = inst->skb->tail; |
0626af31 | 384 | struct sock *sk; |
0597f268 | 385 | |
d550d095 | 386 | nlh = nlmsg_put(inst->skb, 0, 0, |
0597f268 | 387 | NFNL_SUBSYS_ULOG << 8 | NFULNL_MSG_PACKET, |
d550d095 DM |
388 | sizeof(struct nfgenmsg), 0); |
389 | if (!nlh) | |
390 | return -1; | |
391 | nfmsg = nlmsg_data(nlh); | |
0597f268 HW |
392 | nfmsg->nfgen_family = pf; |
393 | nfmsg->version = NFNETLINK_V0; | |
394 | nfmsg->res_id = htons(inst->group_num); | |
395 | ||
febf0a43 | 396 | pmsg.hw_protocol = skb->protocol; |
0597f268 HW |
397 | pmsg.hook = hooknum; |
398 | ||
1db20a52 DM |
399 | if (nla_put(inst->skb, NFULA_PACKET_HDR, sizeof(pmsg), &pmsg)) |
400 | goto nla_put_failure; | |
0597f268 | 401 | |
1db20a52 DM |
402 | if (prefix && |
403 | nla_put(inst->skb, NFULA_PREFIX, plen, prefix)) | |
404 | goto nla_put_failure; | |
0597f268 HW |
405 | |
406 | if (indev) { | |
fbcd923c | 407 | #ifndef CONFIG_BRIDGE_NETFILTER |
1db20a52 DM |
408 | if (nla_put_be32(inst->skb, NFULA_IFINDEX_INDEV, |
409 | htonl(indev->ifindex))) | |
410 | goto nla_put_failure; | |
fbcd923c HW |
411 | #else |
412 | if (pf == PF_BRIDGE) { | |
413 | /* Case 1: outdev is physical input device, we need to | |
414 | * look for bridge group (when called from | |
415 | * netfilter_bridge) */ | |
1db20a52 DM |
416 | if (nla_put_be32(inst->skb, NFULA_IFINDEX_PHYSINDEV, |
417 | htonl(indev->ifindex)) || | |
fbcd923c | 418 | /* this is the bridge group "brX" */ |
f350a0a8 | 419 | /* rcu_read_lock()ed by nf_hook_slow or nf_log_packet */ |
1db20a52 DM |
420 | nla_put_be32(inst->skb, NFULA_IFINDEX_INDEV, |
421 | htonl(br_port_get_rcu(indev)->br->dev->ifindex))) | |
422 | goto nla_put_failure; | |
fbcd923c HW |
423 | } else { |
424 | /* Case 2: indev is bridge group, we need to look for | |
425 | * physical device (when called from ipv4) */ | |
1db20a52 DM |
426 | if (nla_put_be32(inst->skb, NFULA_IFINDEX_INDEV, |
427 | htonl(indev->ifindex))) | |
428 | goto nla_put_failure; | |
429 | if (skb->nf_bridge && skb->nf_bridge->physindev && | |
430 | nla_put_be32(inst->skb, NFULA_IFINDEX_PHYSINDEV, | |
431 | htonl(skb->nf_bridge->physindev->ifindex))) | |
432 | goto nla_put_failure; | |
fbcd923c HW |
433 | } |
434 | #endif | |
0597f268 HW |
435 | } |
436 | ||
437 | if (outdev) { | |
fbcd923c | 438 | #ifndef CONFIG_BRIDGE_NETFILTER |
1db20a52 DM |
439 | if (nla_put_be32(inst->skb, NFULA_IFINDEX_OUTDEV, |
440 | htonl(outdev->ifindex))) | |
441 | goto nla_put_failure; | |
fbcd923c HW |
442 | #else |
443 | if (pf == PF_BRIDGE) { | |
444 | /* Case 1: outdev is physical output device, we need to | |
445 | * look for bridge group (when called from | |
446 | * netfilter_bridge) */ | |
1db20a52 DM |
447 | if (nla_put_be32(inst->skb, NFULA_IFINDEX_PHYSOUTDEV, |
448 | htonl(outdev->ifindex)) || | |
fbcd923c | 449 | /* this is the bridge group "brX" */ |
f350a0a8 | 450 | /* rcu_read_lock()ed by nf_hook_slow or nf_log_packet */ |
1db20a52 DM |
451 | nla_put_be32(inst->skb, NFULA_IFINDEX_OUTDEV, |
452 | htonl(br_port_get_rcu(outdev)->br->dev->ifindex))) | |
453 | goto nla_put_failure; | |
fbcd923c HW |
454 | } else { |
455 | /* Case 2: indev is a bridge group, we need to look | |
456 | * for physical device (when called from ipv4) */ | |
1db20a52 DM |
457 | if (nla_put_be32(inst->skb, NFULA_IFINDEX_OUTDEV, |
458 | htonl(outdev->ifindex))) | |
459 | goto nla_put_failure; | |
460 | if (skb->nf_bridge && skb->nf_bridge->physoutdev && | |
461 | nla_put_be32(inst->skb, NFULA_IFINDEX_PHYSOUTDEV, | |
462 | htonl(skb->nf_bridge->physoutdev->ifindex))) | |
463 | goto nla_put_failure; | |
fbcd923c HW |
464 | } |
465 | #endif | |
0597f268 HW |
466 | } |
467 | ||
1db20a52 DM |
468 | if (skb->mark && |
469 | nla_put_be32(inst->skb, NFULA_MARK, htonl(skb->mark))) | |
470 | goto nla_put_failure; | |
0597f268 | 471 | |
2c38de4c NC |
472 | if (indev && skb->dev && |
473 | skb->mac_header != skb->network_header) { | |
0597f268 | 474 | struct nfulnl_msg_packet_hw phw; |
b95cce35 SH |
475 | int len = dev_parse_header(skb, phw.hw_addr); |
476 | if (len > 0) { | |
477 | phw.hw_addrlen = htons(len); | |
1db20a52 DM |
478 | if (nla_put(inst->skb, NFULA_HWADDR, sizeof(phw), &phw)) |
479 | goto nla_put_failure; | |
b95cce35 | 480 | } |
0597f268 HW |
481 | } |
482 | ||
72961ecf | 483 | if (indev && skb_mac_header_was_set(skb)) { |
2dba62c3 | 484 | if (nla_put_be16(inst->skb, NFULA_HWTYPE, htons(skb->dev->type)) || |
1db20a52 DM |
485 | nla_put_be16(inst->skb, NFULA_HWLEN, |
486 | htons(skb->dev->hard_header_len)) || | |
487 | nla_put(inst->skb, NFULA_HWHEADER, skb->dev->hard_header_len, | |
488 | skb_mac_header(skb))) | |
489 | goto nla_put_failure; | |
72961ecf EL |
490 | } |
491 | ||
b7aa0bf7 | 492 | if (skb->tstamp.tv64) { |
0597f268 | 493 | struct nfulnl_msg_packet_timestamp ts; |
b7aa0bf7 ED |
494 | struct timeval tv = ktime_to_timeval(skb->tstamp); |
495 | ts.sec = cpu_to_be64(tv.tv_sec); | |
496 | ts.usec = cpu_to_be64(tv.tv_usec); | |
0597f268 | 497 | |
1db20a52 DM |
498 | if (nla_put(inst->skb, NFULA_TIMESTAMP, sizeof(ts), &ts)) |
499 | goto nla_put_failure; | |
0597f268 HW |
500 | } |
501 | ||
502 | /* UID */ | |
0626af31 ED |
503 | sk = skb->sk; |
504 | if (sk && sk->sk_state != TCP_TIME_WAIT) { | |
505 | read_lock_bh(&sk->sk_callback_lock); | |
506 | if (sk->sk_socket && sk->sk_socket->file) { | |
507 | struct file *file = sk->sk_socket->file; | |
d76b0d9b DH |
508 | __be32 uid = htonl(file->f_cred->fsuid); |
509 | __be32 gid = htonl(file->f_cred->fsgid); | |
0626af31 | 510 | read_unlock_bh(&sk->sk_callback_lock); |
1db20a52 DM |
511 | if (nla_put_be32(inst->skb, NFULA_UID, uid) || |
512 | nla_put_be32(inst->skb, NFULA_GID, gid)) | |
513 | goto nla_put_failure; | |
0597f268 | 514 | } else |
0626af31 | 515 | read_unlock_bh(&sk->sk_callback_lock); |
0597f268 HW |
516 | } |
517 | ||
0af5f6c1 | 518 | /* local sequence number */ |
1db20a52 DM |
519 | if ((inst->flags & NFULNL_CFG_F_SEQ) && |
520 | nla_put_be32(inst->skb, NFULA_SEQ, htonl(inst->seq++))) | |
521 | goto nla_put_failure; | |
0dfedd28 | 522 | |
0af5f6c1 | 523 | /* global sequence number */ |
1db20a52 DM |
524 | if ((inst->flags & NFULNL_CFG_F_SEQ_GLOBAL) && |
525 | nla_put_be32(inst->skb, NFULA_SEQ_GLOBAL, | |
526 | htonl(atomic_inc_return(&global_seq)))) | |
527 | goto nla_put_failure; | |
0af5f6c1 | 528 | |
0597f268 | 529 | if (data_len) { |
df6fb868 PM |
530 | struct nlattr *nla; |
531 | int size = nla_attr_size(data_len); | |
0597f268 | 532 | |
df6fb868 | 533 | if (skb_tailroom(inst->skb) < nla_total_size(data_len)) { |
0597f268 | 534 | printk(KERN_WARNING "nfnetlink_log: no tailroom!\n"); |
d550d095 | 535 | return -1; |
0597f268 HW |
536 | } |
537 | ||
df6fb868 PM |
538 | nla = (struct nlattr *)skb_put(inst->skb, nla_total_size(data_len)); |
539 | nla->nla_type = NFULA_PAYLOAD; | |
540 | nla->nla_len = size; | |
0597f268 | 541 | |
df6fb868 | 542 | if (skb_copy_bits(skb, 0, nla_data(nla), data_len)) |
0597f268 HW |
543 | BUG(); |
544 | } | |
601e68e1 | 545 | |
0597f268 HW |
546 | nlh->nlmsg_len = inst->skb->tail - old_tail; |
547 | return 0; | |
548 | ||
df6fb868 | 549 | nla_put_failure: |
0597f268 HW |
550 | PRINTR(KERN_ERR "nfnetlink_log: error creating log nlmsg\n"); |
551 | return -1; | |
552 | } | |
553 | ||
554 | #define RCV_SKB_FAIL(err) do { netlink_ack(skb, nlh, (err)); return; } while (0) | |
555 | ||
556 | static struct nf_loginfo default_loginfo = { | |
557 | .type = NF_LOG_TYPE_ULOG, | |
558 | .u = { | |
559 | .ulog = { | |
560 | .copy_len = 0xffff, | |
561 | .group = 0, | |
562 | .qthreshold = 1, | |
563 | }, | |
564 | }, | |
565 | }; | |
566 | ||
567 | /* log handler for internal netfilter logging api */ | |
5f7340ef | 568 | void |
76108cea | 569 | nfulnl_log_packet(u_int8_t pf, |
0597f268 HW |
570 | unsigned int hooknum, |
571 | const struct sk_buff *skb, | |
572 | const struct net_device *in, | |
573 | const struct net_device *out, | |
574 | const struct nf_loginfo *li_user, | |
575 | const char *prefix) | |
576 | { | |
577 | unsigned int size, data_len; | |
578 | struct nfulnl_instance *inst; | |
579 | const struct nf_loginfo *li; | |
580 | unsigned int qthreshold; | |
d7a5c324 | 581 | unsigned int plen; |
0597f268 | 582 | |
601e68e1 | 583 | if (li_user && li_user->type == NF_LOG_TYPE_ULOG) |
0597f268 HW |
584 | li = li_user; |
585 | else | |
586 | li = &default_loginfo; | |
587 | ||
588 | inst = instance_lookup_get(li->u.ulog.group); | |
589 | if (!inst) | |
0597f268 | 590 | return; |
0597f268 | 591 | |
d7a5c324 PM |
592 | plen = 0; |
593 | if (prefix) | |
881dbfe8 | 594 | plen = strlen(prefix) + 1; |
d7a5c324 | 595 | |
0597f268 HW |
596 | /* FIXME: do we want to make the size calculation conditional based on |
597 | * what is actually present? way more branches and checks, but more | |
598 | * memory efficient... */ | |
7000d38d | 599 | size = NLMSG_SPACE(sizeof(struct nfgenmsg)) |
df6fb868 PM |
600 | + nla_total_size(sizeof(struct nfulnl_msg_packet_hdr)) |
601 | + nla_total_size(sizeof(u_int32_t)) /* ifindex */ | |
602 | + nla_total_size(sizeof(u_int32_t)) /* ifindex */ | |
fbcd923c | 603 | #ifdef CONFIG_BRIDGE_NETFILTER |
df6fb868 PM |
604 | + nla_total_size(sizeof(u_int32_t)) /* ifindex */ |
605 | + nla_total_size(sizeof(u_int32_t)) /* ifindex */ | |
fbcd923c | 606 | #endif |
df6fb868 PM |
607 | + nla_total_size(sizeof(u_int32_t)) /* mark */ |
608 | + nla_total_size(sizeof(u_int32_t)) /* uid */ | |
76aa1ce1 | 609 | + nla_total_size(sizeof(u_int32_t)) /* gid */ |
df6fb868 PM |
610 | + nla_total_size(plen) /* prefix */ |
611 | + nla_total_size(sizeof(struct nfulnl_msg_packet_hw)) | |
612 | + nla_total_size(sizeof(struct nfulnl_msg_packet_timestamp)); | |
0597f268 | 613 | |
eeff9bee PNA |
614 | if (in && skb_mac_header_was_set(skb)) { |
615 | size += nla_total_size(skb->dev->hard_header_len) | |
616 | + nla_total_size(sizeof(u_int16_t)) /* hwtype */ | |
617 | + nla_total_size(sizeof(u_int16_t)); /* hwlen */ | |
618 | } | |
619 | ||
0597f268 HW |
620 | spin_lock_bh(&inst->lock); |
621 | ||
0af5f6c1 | 622 | if (inst->flags & NFULNL_CFG_F_SEQ) |
df6fb868 | 623 | size += nla_total_size(sizeof(u_int32_t)); |
0af5f6c1 | 624 | if (inst->flags & NFULNL_CFG_F_SEQ_GLOBAL) |
df6fb868 | 625 | size += nla_total_size(sizeof(u_int32_t)); |
0af5f6c1 | 626 | |
0597f268 HW |
627 | qthreshold = inst->qthreshold; |
628 | /* per-rule qthreshold overrides per-instance */ | |
5ca431f9 EL |
629 | if (li->u.ulog.qthreshold) |
630 | if (qthreshold > li->u.ulog.qthreshold) | |
631 | qthreshold = li->u.ulog.qthreshold; | |
632 | ||
601e68e1 | 633 | |
0597f268 HW |
634 | switch (inst->copy_mode) { |
635 | case NFULNL_COPY_META: | |
636 | case NFULNL_COPY_NONE: | |
637 | data_len = 0; | |
638 | break; | |
601e68e1 | 639 | |
0597f268 | 640 | case NFULNL_COPY_PACKET: |
601e68e1 | 641 | if (inst->copy_range == 0 |
0597f268 HW |
642 | || inst->copy_range > skb->len) |
643 | data_len = skb->len; | |
644 | else | |
645 | data_len = inst->copy_range; | |
601e68e1 | 646 | |
df6fb868 | 647 | size += nla_total_size(data_len); |
0597f268 | 648 | break; |
601e68e1 | 649 | |
f5c5440d | 650 | case NFULNL_COPY_DISABLED: |
0597f268 | 651 | default: |
55b5a91e | 652 | goto unlock_and_release; |
0597f268 HW |
653 | } |
654 | ||
d63b043d MM |
655 | if (inst->skb && |
656 | size > skb_tailroom(inst->skb) - sizeof(struct nfgenmsg)) { | |
0597f268 HW |
657 | /* either the queue len is too high or we don't have |
658 | * enough room in the skb left. flush to userspace. */ | |
e3567061 | 659 | __nfulnl_flush(inst); |
55b5a91e | 660 | } |
0597f268 | 661 | |
55b5a91e MM |
662 | if (!inst->skb) { |
663 | inst->skb = nfulnl_alloc_skb(inst->nlbufsiz, size); | |
664 | if (!inst->skb) | |
0597f268 | 665 | goto alloc_failure; |
0597f268 HW |
666 | } |
667 | ||
0597f268 HW |
668 | inst->qlen++; |
669 | ||
670 | __build_packet_message(inst, skb, data_len, pf, | |
8248779b | 671 | hooknum, in, out, prefix, plen); |
0597f268 | 672 | |
d63b043d MM |
673 | if (inst->qlen >= qthreshold) |
674 | __nfulnl_flush(inst); | |
0597f268 HW |
675 | /* timer_pending always called within inst->lock, so there |
676 | * is no chance of a race here */ | |
d63b043d | 677 | else if (!timer_pending(&inst->timer)) { |
0597f268 HW |
678 | instance_get(inst); |
679 | inst->timer.expires = jiffies + (inst->flushtimeout*HZ/100); | |
680 | add_timer(&inst->timer); | |
681 | } | |
0597f268 | 682 | |
ed32abea MM |
683 | unlock_and_release: |
684 | spin_unlock_bh(&inst->lock); | |
685 | instance_put(inst); | |
0597f268 HW |
686 | return; |
687 | ||
688 | alloc_failure: | |
0597f268 | 689 | /* FIXME: statistics */ |
ed32abea | 690 | goto unlock_and_release; |
0597f268 | 691 | } |
5f7340ef | 692 | EXPORT_SYMBOL_GPL(nfulnl_log_packet); |
0597f268 HW |
693 | |
694 | static int | |
695 | nfulnl_rcv_nl_event(struct notifier_block *this, | |
696 | unsigned long event, void *ptr) | |
697 | { | |
698 | struct netlink_notify *n = ptr; | |
699 | ||
dee5817e | 700 | if (event == NETLINK_URELEASE && n->protocol == NETLINK_NETFILTER) { |
0597f268 HW |
701 | int i; |
702 | ||
703 | /* destroy all instances for this pid */ | |
bed1be20 | 704 | spin_lock_bh(&instances_lock); |
0597f268 HW |
705 | for (i = 0; i < INSTANCE_BUCKETS; i++) { |
706 | struct hlist_node *tmp, *t2; | |
707 | struct nfulnl_instance *inst; | |
708 | struct hlist_head *head = &instance_table[i]; | |
709 | ||
710 | hlist_for_each_entry_safe(inst, tmp, t2, head, hlist) { | |
09ad9bc7 | 711 | if ((net_eq(n->net, &init_net)) && |
b4b51029 | 712 | (n->pid == inst->peer_pid)) |
0597f268 HW |
713 | __instance_destroy(inst); |
714 | } | |
715 | } | |
bed1be20 | 716 | spin_unlock_bh(&instances_lock); |
0597f268 HW |
717 | } |
718 | return NOTIFY_DONE; | |
719 | } | |
720 | ||
721 | static struct notifier_block nfulnl_rtnl_notifier = { | |
722 | .notifier_call = nfulnl_rcv_nl_event, | |
723 | }; | |
724 | ||
725 | static int | |
726 | nfulnl_recv_unsupp(struct sock *ctnl, struct sk_buff *skb, | |
39938324 PM |
727 | const struct nlmsghdr *nlh, |
728 | const struct nlattr * const nfqa[]) | |
0597f268 HW |
729 | { |
730 | return -ENOTSUPP; | |
731 | } | |
732 | ||
ca735b3a | 733 | static struct nf_logger nfulnl_logger __read_mostly = { |
0597f268 HW |
734 | .name = "nfnetlink_log", |
735 | .logfn = &nfulnl_log_packet, | |
736 | .me = THIS_MODULE, | |
737 | }; | |
738 | ||
fd8281ad PM |
739 | static const struct nla_policy nfula_cfg_policy[NFULA_CFG_MAX+1] = { |
740 | [NFULA_CFG_CMD] = { .len = sizeof(struct nfulnl_msg_config_cmd) }, | |
741 | [NFULA_CFG_MODE] = { .len = sizeof(struct nfulnl_msg_config_mode) }, | |
742 | [NFULA_CFG_TIMEOUT] = { .type = NLA_U32 }, | |
743 | [NFULA_CFG_QTHRESH] = { .type = NLA_U32 }, | |
744 | [NFULA_CFG_NLBUFSIZ] = { .type = NLA_U32 }, | |
745 | [NFULA_CFG_FLAGS] = { .type = NLA_U16 }, | |
0597f268 HW |
746 | }; |
747 | ||
748 | static int | |
749 | nfulnl_recv_config(struct sock *ctnl, struct sk_buff *skb, | |
39938324 PM |
750 | const struct nlmsghdr *nlh, |
751 | const struct nlattr * const nfula[]) | |
0597f268 | 752 | { |
d550d095 | 753 | struct nfgenmsg *nfmsg = nlmsg_data(nlh); |
0597f268 HW |
754 | u_int16_t group_num = ntohs(nfmsg->res_id); |
755 | struct nfulnl_instance *inst; | |
b7047a1c | 756 | struct nfulnl_msg_config_cmd *cmd = NULL; |
0597f268 HW |
757 | int ret = 0; |
758 | ||
b7047a1c PM |
759 | if (nfula[NFULA_CFG_CMD]) { |
760 | u_int8_t pf = nfmsg->nfgen_family; | |
761 | cmd = nla_data(nfula[NFULA_CFG_CMD]); | |
762 | ||
763 | /* Commands without queue context */ | |
764 | switch (cmd->command) { | |
765 | case NFULNL_CFG_CMD_PF_BIND: | |
ca735b3a | 766 | return nf_log_bind_pf(pf, &nfulnl_logger); |
b7047a1c | 767 | case NFULNL_CFG_CMD_PF_UNBIND: |
ca735b3a | 768 | nf_log_unbind_pf(pf); |
b7047a1c PM |
769 | return 0; |
770 | } | |
771 | } | |
772 | ||
0597f268 | 773 | inst = instance_lookup_get(group_num); |
c0506365 PM |
774 | if (inst && inst->peer_pid != NETLINK_CB(skb).pid) { |
775 | ret = -EPERM; | |
776 | goto out_put; | |
777 | } | |
778 | ||
b7047a1c | 779 | if (cmd != NULL) { |
0597f268 HW |
780 | switch (cmd->command) { |
781 | case NFULNL_CFG_CMD_BIND: | |
782 | if (inst) { | |
783 | ret = -EBUSY; | |
784 | goto out_put; | |
785 | } | |
786 | ||
787 | inst = instance_create(group_num, | |
788 | NETLINK_CB(skb).pid); | |
baab2ce7 PM |
789 | if (IS_ERR(inst)) { |
790 | ret = PTR_ERR(inst); | |
f414c16c | 791 | goto out; |
0597f268 HW |
792 | } |
793 | break; | |
794 | case NFULNL_CFG_CMD_UNBIND: | |
795 | if (!inst) { | |
796 | ret = -ENODEV; | |
f414c16c | 797 | goto out; |
0597f268 HW |
798 | } |
799 | ||
0597f268 | 800 | instance_destroy(inst); |
a49c6503 | 801 | goto out_put; |
0597f268 | 802 | default: |
cd21f0ac | 803 | ret = -ENOTSUPP; |
0597f268 HW |
804 | break; |
805 | } | |
0597f268 HW |
806 | } |
807 | ||
df6fb868 | 808 | if (nfula[NFULA_CFG_MODE]) { |
0597f268 | 809 | struct nfulnl_msg_config_mode *params; |
df6fb868 | 810 | params = nla_data(nfula[NFULA_CFG_MODE]); |
0597f268 | 811 | |
c0506365 PM |
812 | if (!inst) { |
813 | ret = -ENODEV; | |
814 | goto out; | |
815 | } | |
0597f268 | 816 | nfulnl_set_mode(inst, params->copy_mode, |
d1208b99 | 817 | ntohl(params->copy_range)); |
0597f268 HW |
818 | } |
819 | ||
df6fb868 | 820 | if (nfula[NFULA_CFG_TIMEOUT]) { |
0dfedd28 | 821 | __be32 timeout = nla_get_be32(nfula[NFULA_CFG_TIMEOUT]); |
0597f268 | 822 | |
c0506365 PM |
823 | if (!inst) { |
824 | ret = -ENODEV; | |
825 | goto out; | |
826 | } | |
0597f268 HW |
827 | nfulnl_set_timeout(inst, ntohl(timeout)); |
828 | } | |
829 | ||
df6fb868 | 830 | if (nfula[NFULA_CFG_NLBUFSIZ]) { |
0dfedd28 | 831 | __be32 nlbufsiz = nla_get_be32(nfula[NFULA_CFG_NLBUFSIZ]); |
0597f268 | 832 | |
c0506365 PM |
833 | if (!inst) { |
834 | ret = -ENODEV; | |
835 | goto out; | |
836 | } | |
0597f268 HW |
837 | nfulnl_set_nlbufsiz(inst, ntohl(nlbufsiz)); |
838 | } | |
839 | ||
df6fb868 | 840 | if (nfula[NFULA_CFG_QTHRESH]) { |
0dfedd28 | 841 | __be32 qthresh = nla_get_be32(nfula[NFULA_CFG_QTHRESH]); |
0597f268 | 842 | |
c0506365 PM |
843 | if (!inst) { |
844 | ret = -ENODEV; | |
845 | goto out; | |
846 | } | |
0597f268 HW |
847 | nfulnl_set_qthresh(inst, ntohl(qthresh)); |
848 | } | |
849 | ||
df6fb868 | 850 | if (nfula[NFULA_CFG_FLAGS]) { |
0dfedd28 | 851 | __be16 flags = nla_get_be16(nfula[NFULA_CFG_FLAGS]); |
c0506365 PM |
852 | |
853 | if (!inst) { | |
854 | ret = -ENODEV; | |
855 | goto out; | |
856 | } | |
ee433530 | 857 | nfulnl_set_flags(inst, ntohs(flags)); |
0af5f6c1 HW |
858 | } |
859 | ||
0597f268 HW |
860 | out_put: |
861 | instance_put(inst); | |
dd16704e | 862 | out: |
0597f268 HW |
863 | return ret; |
864 | } | |
865 | ||
7c8d4cb4 | 866 | static const struct nfnl_callback nfulnl_cb[NFULNL_MSG_MAX] = { |
0597f268 | 867 | [NFULNL_MSG_PACKET] = { .call = nfulnl_recv_unsupp, |
37d2e7a2 | 868 | .attr_count = NFULA_MAX, }, |
0597f268 | 869 | [NFULNL_MSG_CONFIG] = { .call = nfulnl_recv_config, |
fd8281ad PM |
870 | .attr_count = NFULA_CFG_MAX, |
871 | .policy = nfula_cfg_policy }, | |
0597f268 HW |
872 | }; |
873 | ||
7c8d4cb4 | 874 | static const struct nfnetlink_subsystem nfulnl_subsys = { |
0597f268 HW |
875 | .name = "log", |
876 | .subsys_id = NFNL_SUBSYS_ULOG, | |
877 | .cb_count = NFULNL_MSG_MAX, | |
0597f268 HW |
878 | .cb = nfulnl_cb, |
879 | }; | |
880 | ||
881 | #ifdef CONFIG_PROC_FS | |
882 | struct iter_state { | |
883 | unsigned int bucket; | |
884 | }; | |
885 | ||
f76cdcee | 886 | static struct hlist_node *get_first(struct iter_state *st) |
0597f268 | 887 | { |
0597f268 HW |
888 | if (!st) |
889 | return NULL; | |
890 | ||
891 | for (st->bucket = 0; st->bucket < INSTANCE_BUCKETS; st->bucket++) { | |
892 | if (!hlist_empty(&instance_table[st->bucket])) | |
0e60ebe0 | 893 | return rcu_dereference_bh(hlist_first_rcu(&instance_table[st->bucket])); |
0597f268 HW |
894 | } |
895 | return NULL; | |
896 | } | |
897 | ||
f76cdcee | 898 | static struct hlist_node *get_next(struct iter_state *st, struct hlist_node *h) |
0597f268 | 899 | { |
0e60ebe0 | 900 | h = rcu_dereference_bh(hlist_next_rcu(h)); |
0597f268 HW |
901 | while (!h) { |
902 | if (++st->bucket >= INSTANCE_BUCKETS) | |
903 | return NULL; | |
904 | ||
0e60ebe0 | 905 | h = rcu_dereference_bh(hlist_first_rcu(&instance_table[st->bucket])); |
0597f268 HW |
906 | } |
907 | return h; | |
908 | } | |
909 | ||
f76cdcee | 910 | static struct hlist_node *get_idx(struct iter_state *st, loff_t pos) |
0597f268 HW |
911 | { |
912 | struct hlist_node *head; | |
f76cdcee | 913 | head = get_first(st); |
0597f268 HW |
914 | |
915 | if (head) | |
f76cdcee | 916 | while (pos && (head = get_next(st, head))) |
0597f268 HW |
917 | pos--; |
918 | return pos ? NULL : head; | |
919 | } | |
920 | ||
921 | static void *seq_start(struct seq_file *seq, loff_t *pos) | |
bed1be20 | 922 | __acquires(rcu_bh) |
0597f268 | 923 | { |
bed1be20 | 924 | rcu_read_lock_bh(); |
f76cdcee | 925 | return get_idx(seq->private, *pos); |
0597f268 HW |
926 | } |
927 | ||
928 | static void *seq_next(struct seq_file *s, void *v, loff_t *pos) | |
929 | { | |
930 | (*pos)++; | |
f76cdcee | 931 | return get_next(s->private, v); |
0597f268 HW |
932 | } |
933 | ||
934 | static void seq_stop(struct seq_file *s, void *v) | |
bed1be20 | 935 | __releases(rcu_bh) |
0597f268 | 936 | { |
bed1be20 | 937 | rcu_read_unlock_bh(); |
0597f268 HW |
938 | } |
939 | ||
940 | static int seq_show(struct seq_file *s, void *v) | |
941 | { | |
942 | const struct nfulnl_instance *inst = v; | |
943 | ||
601e68e1 | 944 | return seq_printf(s, "%5d %6d %5d %1d %5d %6d %2d\n", |
0597f268 | 945 | inst->group_num, |
601e68e1 | 946 | inst->peer_pid, inst->qlen, |
0597f268 HW |
947 | inst->copy_mode, inst->copy_range, |
948 | inst->flushtimeout, atomic_read(&inst->use)); | |
949 | } | |
950 | ||
56b3d975 | 951 | static const struct seq_operations nful_seq_ops = { |
0597f268 HW |
952 | .start = seq_start, |
953 | .next = seq_next, | |
954 | .stop = seq_stop, | |
955 | .show = seq_show, | |
956 | }; | |
957 | ||
958 | static int nful_open(struct inode *inode, struct file *file) | |
959 | { | |
e2da5913 PE |
960 | return seq_open_private(file, &nful_seq_ops, |
961 | sizeof(struct iter_state)); | |
0597f268 HW |
962 | } |
963 | ||
da7071d7 | 964 | static const struct file_operations nful_file_ops = { |
0597f268 HW |
965 | .owner = THIS_MODULE, |
966 | .open = nful_open, | |
967 | .read = seq_read, | |
968 | .llseek = seq_lseek, | |
969 | .release = seq_release_private, | |
970 | }; | |
971 | ||
972 | #endif /* PROC_FS */ | |
973 | ||
32292a7f | 974 | static int __init nfnetlink_log_init(void) |
0597f268 HW |
975 | { |
976 | int i, status = -ENOMEM; | |
601e68e1 | 977 | |
0597f268 HW |
978 | for (i = 0; i < INSTANCE_BUCKETS; i++) |
979 | INIT_HLIST_HEAD(&instance_table[i]); | |
601e68e1 | 980 | |
0597f268 HW |
981 | /* it's not really all that important to have a random value, so |
982 | * we can do this from the init function, even if there hasn't | |
983 | * been that much entropy yet */ | |
984 | get_random_bytes(&hash_init, sizeof(hash_init)); | |
985 | ||
986 | netlink_register_notifier(&nfulnl_rtnl_notifier); | |
987 | status = nfnetlink_subsys_register(&nfulnl_subsys); | |
988 | if (status < 0) { | |
989 | printk(KERN_ERR "log: failed to create netlink socket\n"); | |
990 | goto cleanup_netlink_notifier; | |
991 | } | |
992 | ||
ca735b3a EL |
993 | status = nf_log_register(NFPROTO_UNSPEC, &nfulnl_logger); |
994 | if (status < 0) { | |
995 | printk(KERN_ERR "log: failed to register logger\n"); | |
996 | goto cleanup_subsys; | |
997 | } | |
998 | ||
0597f268 | 999 | #ifdef CONFIG_PROC_FS |
8eeee8b1 | 1000 | if (!proc_create("nfnetlink_log", 0440, |
6fc09f10 JL |
1001 | proc_net_netfilter, &nful_file_ops)) { |
1002 | status = -ENOMEM; | |
ca735b3a | 1003 | goto cleanup_logger; |
6fc09f10 | 1004 | } |
0597f268 | 1005 | #endif |
0597f268 HW |
1006 | return status; |
1007 | ||
0597f268 | 1008 | #ifdef CONFIG_PROC_FS |
ca735b3a EL |
1009 | cleanup_logger: |
1010 | nf_log_unregister(&nfulnl_logger); | |
1011 | #endif | |
0597f268 | 1012 | cleanup_subsys: |
0597f268 HW |
1013 | nfnetlink_subsys_unregister(&nfulnl_subsys); |
1014 | cleanup_netlink_notifier: | |
1015 | netlink_unregister_notifier(&nfulnl_rtnl_notifier); | |
1016 | return status; | |
1017 | } | |
1018 | ||
65b4b4e8 | 1019 | static void __exit nfnetlink_log_fini(void) |
0597f268 | 1020 | { |
e92ad99c | 1021 | nf_log_unregister(&nfulnl_logger); |
32292a7f PM |
1022 | #ifdef CONFIG_PROC_FS |
1023 | remove_proc_entry("nfnetlink_log", proc_net_netfilter); | |
1024 | #endif | |
1025 | nfnetlink_subsys_unregister(&nfulnl_subsys); | |
1026 | netlink_unregister_notifier(&nfulnl_rtnl_notifier); | |
0597f268 HW |
1027 | } |
1028 | ||
1029 | MODULE_DESCRIPTION("netfilter userspace logging"); | |
1030 | MODULE_AUTHOR("Harald Welte <laforge@netfilter.org>"); | |
1031 | MODULE_LICENSE("GPL"); | |
f682faef | 1032 | MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_ULOG); |
0597f268 | 1033 | |
65b4b4e8 AM |
1034 | module_init(nfnetlink_log_init); |
1035 | module_exit(nfnetlink_log_fini); |