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 | 57 | struct timer_list timer; |
9eea9515 | 58 | struct user_namespace *peer_user_ns; /* User namespace of the peer process */ |
15e47304 | 59 | int peer_portid; /* PORTID of the peer process */ |
0597f268 HW |
60 | |
61 | /* configurable parameters */ | |
62 | unsigned int flushtimeout; /* timeout until queue flush */ | |
63 | unsigned int nlbufsiz; /* netlink buffer allocation size */ | |
64 | unsigned int qthreshold; /* threshold of the queue */ | |
65 | u_int32_t copy_range; | |
0af5f6c1 | 66 | u_int32_t seq; /* instance-local sequential counter */ |
0597f268 | 67 | u_int16_t group_num; /* number of this queue */ |
0af5f6c1 | 68 | u_int16_t flags; |
601e68e1 | 69 | u_int8_t copy_mode; |
bed1be20 | 70 | struct rcu_head rcu; |
0597f268 HW |
71 | }; |
72 | ||
bed1be20 | 73 | static DEFINE_SPINLOCK(instances_lock); |
0af5f6c1 | 74 | static atomic_t global_seq; |
0597f268 HW |
75 | |
76 | #define INSTANCE_BUCKETS 16 | |
77 | static struct hlist_head instance_table[INSTANCE_BUCKETS]; | |
78 | static unsigned int hash_init; | |
79 | ||
80 | static inline u_int8_t instance_hashfn(u_int16_t group_num) | |
81 | { | |
82 | return ((group_num & 0xff) % INSTANCE_BUCKETS); | |
83 | } | |
84 | ||
85 | static struct nfulnl_instance * | |
86 | __instance_lookup(u_int16_t group_num) | |
87 | { | |
88 | struct hlist_head *head; | |
89 | struct hlist_node *pos; | |
90 | struct nfulnl_instance *inst; | |
91 | ||
0597f268 | 92 | head = &instance_table[instance_hashfn(group_num)]; |
bed1be20 | 93 | hlist_for_each_entry_rcu(inst, pos, head, hlist) { |
0597f268 HW |
94 | if (inst->group_num == group_num) |
95 | return inst; | |
96 | } | |
97 | return NULL; | |
98 | } | |
99 | ||
100 | static inline void | |
101 | instance_get(struct nfulnl_instance *inst) | |
102 | { | |
103 | atomic_inc(&inst->use); | |
104 | } | |
105 | ||
106 | static struct nfulnl_instance * | |
107 | instance_lookup_get(u_int16_t group_num) | |
108 | { | |
109 | struct nfulnl_instance *inst; | |
110 | ||
bed1be20 | 111 | rcu_read_lock_bh(); |
0597f268 | 112 | inst = __instance_lookup(group_num); |
f5c5440d ED |
113 | if (inst && !atomic_inc_not_zero(&inst->use)) |
114 | inst = NULL; | |
bed1be20 | 115 | rcu_read_unlock_bh(); |
0597f268 HW |
116 | |
117 | return inst; | |
118 | } | |
119 | ||
bed1be20 ED |
120 | static void nfulnl_instance_free_rcu(struct rcu_head *head) |
121 | { | |
122 | kfree(container_of(head, struct nfulnl_instance, rcu)); | |
123 | module_put(THIS_MODULE); | |
124 | } | |
125 | ||
0597f268 HW |
126 | static void |
127 | instance_put(struct nfulnl_instance *inst) | |
128 | { | |
bed1be20 ED |
129 | if (inst && atomic_dec_and_test(&inst->use)) |
130 | call_rcu_bh(&inst->rcu, nfulnl_instance_free_rcu); | |
0597f268 HW |
131 | } |
132 | ||
133 | static void nfulnl_timer(unsigned long data); | |
134 | ||
135 | static struct nfulnl_instance * | |
15e47304 | 136 | instance_create(u_int16_t group_num, int portid, struct user_namespace *user_ns) |
0597f268 HW |
137 | { |
138 | struct nfulnl_instance *inst; | |
baab2ce7 | 139 | int err; |
0597f268 | 140 | |
bed1be20 | 141 | spin_lock_bh(&instances_lock); |
0597f268 | 142 | if (__instance_lookup(group_num)) { |
baab2ce7 | 143 | err = -EEXIST; |
0597f268 HW |
144 | goto out_unlock; |
145 | } | |
146 | ||
10dfdc69 | 147 | inst = kzalloc(sizeof(*inst), GFP_ATOMIC); |
baab2ce7 PM |
148 | if (!inst) { |
149 | err = -ENOMEM; | |
0597f268 | 150 | goto out_unlock; |
baab2ce7 | 151 | } |
0597f268 | 152 | |
aace57e0 MM |
153 | if (!try_module_get(THIS_MODULE)) { |
154 | kfree(inst); | |
baab2ce7 | 155 | err = -EAGAIN; |
aace57e0 MM |
156 | goto out_unlock; |
157 | } | |
158 | ||
0597f268 | 159 | INIT_HLIST_NODE(&inst->hlist); |
181a46a5 | 160 | spin_lock_init(&inst->lock); |
0597f268 HW |
161 | /* needs to be two, since we _put() after creation */ |
162 | atomic_set(&inst->use, 2); | |
163 | ||
e6f689db | 164 | setup_timer(&inst->timer, nfulnl_timer, (unsigned long)inst); |
0597f268 | 165 | |
9eea9515 | 166 | inst->peer_user_ns = user_ns; |
15e47304 | 167 | inst->peer_portid = portid; |
0597f268 HW |
168 | inst->group_num = group_num; |
169 | ||
170 | inst->qthreshold = NFULNL_QTHRESH_DEFAULT; | |
171 | inst->flushtimeout = NFULNL_TIMEOUT_DEFAULT; | |
172 | inst->nlbufsiz = NFULNL_NLBUFSIZ_DEFAULT; | |
173 | inst->copy_mode = NFULNL_COPY_PACKET; | |
6b6ec99a | 174 | inst->copy_range = NFULNL_COPY_RANGE_MAX; |
0597f268 | 175 | |
f5c5440d | 176 | hlist_add_head_rcu(&inst->hlist, |
0597f268 HW |
177 | &instance_table[instance_hashfn(group_num)]); |
178 | ||
bed1be20 | 179 | spin_unlock_bh(&instances_lock); |
0597f268 HW |
180 | |
181 | return inst; | |
182 | ||
0597f268 | 183 | out_unlock: |
bed1be20 | 184 | spin_unlock_bh(&instances_lock); |
baab2ce7 | 185 | return ERR_PTR(err); |
0597f268 HW |
186 | } |
187 | ||
e3567061 | 188 | static void __nfulnl_flush(struct nfulnl_instance *inst); |
0597f268 | 189 | |
f5c5440d | 190 | /* called with BH disabled */ |
0597f268 | 191 | static void |
9afdb00c | 192 | __instance_destroy(struct nfulnl_instance *inst) |
0597f268 HW |
193 | { |
194 | /* first pull it out of the global list */ | |
f5c5440d | 195 | hlist_del_rcu(&inst->hlist); |
0597f268 | 196 | |
0597f268 HW |
197 | /* then flush all pending packets from skb */ |
198 | ||
f5c5440d ED |
199 | spin_lock(&inst->lock); |
200 | ||
201 | /* lockless readers wont be able to use us */ | |
202 | inst->copy_mode = NFULNL_COPY_DISABLED; | |
203 | ||
e3567061 MM |
204 | if (inst->skb) |
205 | __nfulnl_flush(inst); | |
f5c5440d | 206 | spin_unlock(&inst->lock); |
0597f268 HW |
207 | |
208 | /* and finally put the refcount */ | |
209 | instance_put(inst); | |
0597f268 HW |
210 | } |
211 | ||
0597f268 HW |
212 | static inline void |
213 | instance_destroy(struct nfulnl_instance *inst) | |
214 | { | |
bed1be20 | 215 | spin_lock_bh(&instances_lock); |
9afdb00c | 216 | __instance_destroy(inst); |
bed1be20 | 217 | spin_unlock_bh(&instances_lock); |
0597f268 HW |
218 | } |
219 | ||
220 | static int | |
221 | nfulnl_set_mode(struct nfulnl_instance *inst, u_int8_t mode, | |
222 | unsigned int range) | |
223 | { | |
224 | int status = 0; | |
225 | ||
226 | spin_lock_bh(&inst->lock); | |
601e68e1 | 227 | |
0597f268 HW |
228 | switch (mode) { |
229 | case NFULNL_COPY_NONE: | |
230 | case NFULNL_COPY_META: | |
231 | inst->copy_mode = mode; | |
232 | inst->copy_range = 0; | |
233 | break; | |
601e68e1 | 234 | |
0597f268 HW |
235 | case NFULNL_COPY_PACKET: |
236 | inst->copy_mode = mode; | |
6b6ec99a MM |
237 | inst->copy_range = min_t(unsigned int, |
238 | range, NFULNL_COPY_RANGE_MAX); | |
0597f268 | 239 | break; |
601e68e1 | 240 | |
0597f268 HW |
241 | default: |
242 | status = -EINVAL; | |
243 | break; | |
244 | } | |
245 | ||
246 | spin_unlock_bh(&inst->lock); | |
247 | ||
248 | return status; | |
249 | } | |
250 | ||
251 | static int | |
252 | nfulnl_set_nlbufsiz(struct nfulnl_instance *inst, u_int32_t nlbufsiz) | |
253 | { | |
254 | int status; | |
255 | ||
256 | spin_lock_bh(&inst->lock); | |
257 | if (nlbufsiz < NFULNL_NLBUFSIZ_DEFAULT) | |
258 | status = -ERANGE; | |
259 | else if (nlbufsiz > 131072) | |
260 | status = -ERANGE; | |
261 | else { | |
262 | inst->nlbufsiz = nlbufsiz; | |
263 | status = 0; | |
264 | } | |
265 | spin_unlock_bh(&inst->lock); | |
266 | ||
267 | return status; | |
268 | } | |
269 | ||
270 | static int | |
271 | nfulnl_set_timeout(struct nfulnl_instance *inst, u_int32_t timeout) | |
272 | { | |
273 | spin_lock_bh(&inst->lock); | |
274 | inst->flushtimeout = timeout; | |
275 | spin_unlock_bh(&inst->lock); | |
276 | ||
277 | return 0; | |
278 | } | |
279 | ||
280 | static int | |
281 | nfulnl_set_qthresh(struct nfulnl_instance *inst, u_int32_t qthresh) | |
282 | { | |
283 | spin_lock_bh(&inst->lock); | |
284 | inst->qthreshold = qthresh; | |
285 | spin_unlock_bh(&inst->lock); | |
286 | ||
287 | return 0; | |
288 | } | |
289 | ||
0af5f6c1 HW |
290 | static int |
291 | nfulnl_set_flags(struct nfulnl_instance *inst, u_int16_t flags) | |
292 | { | |
293 | spin_lock_bh(&inst->lock); | |
ee433530 | 294 | inst->flags = flags; |
0af5f6c1 HW |
295 | spin_unlock_bh(&inst->lock); |
296 | ||
297 | return 0; | |
298 | } | |
299 | ||
c6a8f648 MM |
300 | static struct sk_buff * |
301 | nfulnl_alloc_skb(unsigned int inst_size, unsigned int pkt_size) | |
0597f268 HW |
302 | { |
303 | struct sk_buff *skb; | |
ad2ad0f9 | 304 | unsigned int n; |
0597f268 | 305 | |
0597f268 HW |
306 | /* alloc skb which should be big enough for a whole multipart |
307 | * message. WARNING: has to be <= 128k due to slab restrictions */ | |
308 | ||
ad2ad0f9 PM |
309 | n = max(inst_size, pkt_size); |
310 | skb = alloc_skb(n, GFP_ATOMIC); | |
0597f268 | 311 | if (!skb) { |
ad2ad0f9 PM |
312 | if (n > pkt_size) { |
313 | /* try to allocate only as much as we need for current | |
314 | * packet */ | |
0597f268 | 315 | |
ad2ad0f9 PM |
316 | skb = alloc_skb(pkt_size, GFP_ATOMIC); |
317 | if (!skb) | |
0a9ee813 JP |
318 | pr_err("nfnetlink_log: can't even alloc %u bytes\n", |
319 | pkt_size); | |
ad2ad0f9 | 320 | } |
0597f268 HW |
321 | } |
322 | ||
323 | return skb; | |
324 | } | |
325 | ||
326 | static int | |
327 | __nfulnl_send(struct nfulnl_instance *inst) | |
328 | { | |
29c5d4af | 329 | int status = -1; |
0597f268 | 330 | |
d550d095 DM |
331 | if (inst->qlen > 1) { |
332 | struct nlmsghdr *nlh = nlmsg_put(inst->skb, 0, 0, | |
333 | NLMSG_DONE, | |
334 | sizeof(struct nfgenmsg), | |
335 | 0); | |
336 | if (!nlh) | |
337 | goto out; | |
338 | } | |
15e47304 | 339 | status = nfnetlink_unicast(inst->skb, &init_net, inst->peer_portid, |
cd8c20b6 | 340 | MSG_DONTWAIT); |
0597f268 HW |
341 | |
342 | inst->qlen = 0; | |
343 | inst->skb = NULL; | |
d550d095 | 344 | out: |
0597f268 HW |
345 | return status; |
346 | } | |
347 | ||
e3567061 MM |
348 | static void |
349 | __nfulnl_flush(struct nfulnl_instance *inst) | |
350 | { | |
351 | /* timer holds a reference */ | |
352 | if (del_timer(&inst->timer)) | |
353 | instance_put(inst); | |
354 | if (inst->skb) | |
355 | __nfulnl_send(inst); | |
356 | } | |
357 | ||
c6a8f648 MM |
358 | static void |
359 | nfulnl_timer(unsigned long data) | |
0597f268 | 360 | { |
601e68e1 | 361 | struct nfulnl_instance *inst = (struct nfulnl_instance *)data; |
0597f268 | 362 | |
0597f268 | 363 | spin_lock_bh(&inst->lock); |
370e6a87 MM |
364 | if (inst->skb) |
365 | __nfulnl_send(inst); | |
0597f268 | 366 | spin_unlock_bh(&inst->lock); |
05f7b7b3 | 367 | instance_put(inst); |
0597f268 HW |
368 | } |
369 | ||
0af5f6c1 HW |
370 | /* This is an inline function, we don't really care about a long |
371 | * list of arguments */ | |
601e68e1 | 372 | static inline int |
0597f268 | 373 | __build_packet_message(struct nfulnl_instance *inst, |
601e68e1 | 374 | const struct sk_buff *skb, |
0597f268 | 375 | unsigned int data_len, |
76108cea | 376 | u_int8_t pf, |
0597f268 HW |
377 | unsigned int hooknum, |
378 | const struct net_device *indev, | |
379 | const struct net_device *outdev, | |
d7a5c324 | 380 | const char *prefix, unsigned int plen) |
0597f268 | 381 | { |
0597f268 HW |
382 | struct nfulnl_msg_packet_hdr pmsg; |
383 | struct nlmsghdr *nlh; | |
384 | struct nfgenmsg *nfmsg; | |
27a884dc | 385 | sk_buff_data_t old_tail = inst->skb->tail; |
0626af31 | 386 | struct sock *sk; |
0597f268 | 387 | |
d550d095 | 388 | nlh = nlmsg_put(inst->skb, 0, 0, |
0597f268 | 389 | NFNL_SUBSYS_ULOG << 8 | NFULNL_MSG_PACKET, |
d550d095 DM |
390 | sizeof(struct nfgenmsg), 0); |
391 | if (!nlh) | |
392 | return -1; | |
393 | nfmsg = nlmsg_data(nlh); | |
0597f268 HW |
394 | nfmsg->nfgen_family = pf; |
395 | nfmsg->version = NFNETLINK_V0; | |
396 | nfmsg->res_id = htons(inst->group_num); | |
397 | ||
febf0a43 | 398 | pmsg.hw_protocol = skb->protocol; |
0597f268 HW |
399 | pmsg.hook = hooknum; |
400 | ||
1db20a52 DM |
401 | if (nla_put(inst->skb, NFULA_PACKET_HDR, sizeof(pmsg), &pmsg)) |
402 | goto nla_put_failure; | |
0597f268 | 403 | |
1db20a52 DM |
404 | if (prefix && |
405 | nla_put(inst->skb, NFULA_PREFIX, plen, prefix)) | |
406 | goto nla_put_failure; | |
0597f268 HW |
407 | |
408 | if (indev) { | |
fbcd923c | 409 | #ifndef CONFIG_BRIDGE_NETFILTER |
1db20a52 DM |
410 | if (nla_put_be32(inst->skb, NFULA_IFINDEX_INDEV, |
411 | htonl(indev->ifindex))) | |
412 | goto nla_put_failure; | |
fbcd923c HW |
413 | #else |
414 | if (pf == PF_BRIDGE) { | |
415 | /* Case 1: outdev is physical input device, we need to | |
416 | * look for bridge group (when called from | |
417 | * netfilter_bridge) */ | |
1db20a52 DM |
418 | if (nla_put_be32(inst->skb, NFULA_IFINDEX_PHYSINDEV, |
419 | htonl(indev->ifindex)) || | |
fbcd923c | 420 | /* this is the bridge group "brX" */ |
f350a0a8 | 421 | /* rcu_read_lock()ed by nf_hook_slow or nf_log_packet */ |
1db20a52 DM |
422 | nla_put_be32(inst->skb, NFULA_IFINDEX_INDEV, |
423 | htonl(br_port_get_rcu(indev)->br->dev->ifindex))) | |
424 | goto nla_put_failure; | |
fbcd923c HW |
425 | } else { |
426 | /* Case 2: indev is bridge group, we need to look for | |
427 | * physical device (when called from ipv4) */ | |
1db20a52 DM |
428 | if (nla_put_be32(inst->skb, NFULA_IFINDEX_INDEV, |
429 | htonl(indev->ifindex))) | |
430 | goto nla_put_failure; | |
431 | if (skb->nf_bridge && skb->nf_bridge->physindev && | |
432 | nla_put_be32(inst->skb, NFULA_IFINDEX_PHYSINDEV, | |
433 | htonl(skb->nf_bridge->physindev->ifindex))) | |
434 | goto nla_put_failure; | |
fbcd923c HW |
435 | } |
436 | #endif | |
0597f268 HW |
437 | } |
438 | ||
439 | if (outdev) { | |
fbcd923c | 440 | #ifndef CONFIG_BRIDGE_NETFILTER |
1db20a52 DM |
441 | if (nla_put_be32(inst->skb, NFULA_IFINDEX_OUTDEV, |
442 | htonl(outdev->ifindex))) | |
443 | goto nla_put_failure; | |
fbcd923c HW |
444 | #else |
445 | if (pf == PF_BRIDGE) { | |
446 | /* Case 1: outdev is physical output device, we need to | |
447 | * look for bridge group (when called from | |
448 | * netfilter_bridge) */ | |
1db20a52 DM |
449 | if (nla_put_be32(inst->skb, NFULA_IFINDEX_PHYSOUTDEV, |
450 | htonl(outdev->ifindex)) || | |
fbcd923c | 451 | /* this is the bridge group "brX" */ |
f350a0a8 | 452 | /* rcu_read_lock()ed by nf_hook_slow or nf_log_packet */ |
1db20a52 DM |
453 | nla_put_be32(inst->skb, NFULA_IFINDEX_OUTDEV, |
454 | htonl(br_port_get_rcu(outdev)->br->dev->ifindex))) | |
455 | goto nla_put_failure; | |
fbcd923c HW |
456 | } else { |
457 | /* Case 2: indev is a bridge group, we need to look | |
458 | * for physical device (when called from ipv4) */ | |
1db20a52 DM |
459 | if (nla_put_be32(inst->skb, NFULA_IFINDEX_OUTDEV, |
460 | htonl(outdev->ifindex))) | |
461 | goto nla_put_failure; | |
462 | if (skb->nf_bridge && skb->nf_bridge->physoutdev && | |
463 | nla_put_be32(inst->skb, NFULA_IFINDEX_PHYSOUTDEV, | |
464 | htonl(skb->nf_bridge->physoutdev->ifindex))) | |
465 | goto nla_put_failure; | |
fbcd923c HW |
466 | } |
467 | #endif | |
0597f268 HW |
468 | } |
469 | ||
1db20a52 DM |
470 | if (skb->mark && |
471 | nla_put_be32(inst->skb, NFULA_MARK, htonl(skb->mark))) | |
472 | goto nla_put_failure; | |
0597f268 | 473 | |
2c38de4c NC |
474 | if (indev && skb->dev && |
475 | skb->mac_header != skb->network_header) { | |
0597f268 | 476 | struct nfulnl_msg_packet_hw phw; |
b95cce35 SH |
477 | int len = dev_parse_header(skb, phw.hw_addr); |
478 | if (len > 0) { | |
479 | phw.hw_addrlen = htons(len); | |
1db20a52 DM |
480 | if (nla_put(inst->skb, NFULA_HWADDR, sizeof(phw), &phw)) |
481 | goto nla_put_failure; | |
b95cce35 | 482 | } |
0597f268 HW |
483 | } |
484 | ||
72961ecf | 485 | if (indev && skb_mac_header_was_set(skb)) { |
2dba62c3 | 486 | if (nla_put_be16(inst->skb, NFULA_HWTYPE, htons(skb->dev->type)) || |
1db20a52 DM |
487 | nla_put_be16(inst->skb, NFULA_HWLEN, |
488 | htons(skb->dev->hard_header_len)) || | |
489 | nla_put(inst->skb, NFULA_HWHEADER, skb->dev->hard_header_len, | |
490 | skb_mac_header(skb))) | |
491 | goto nla_put_failure; | |
72961ecf EL |
492 | } |
493 | ||
b7aa0bf7 | 494 | if (skb->tstamp.tv64) { |
0597f268 | 495 | struct nfulnl_msg_packet_timestamp ts; |
b7aa0bf7 ED |
496 | struct timeval tv = ktime_to_timeval(skb->tstamp); |
497 | ts.sec = cpu_to_be64(tv.tv_sec); | |
498 | ts.usec = cpu_to_be64(tv.tv_usec); | |
0597f268 | 499 | |
1db20a52 DM |
500 | if (nla_put(inst->skb, NFULA_TIMESTAMP, sizeof(ts), &ts)) |
501 | goto nla_put_failure; | |
0597f268 HW |
502 | } |
503 | ||
504 | /* UID */ | |
0626af31 ED |
505 | sk = skb->sk; |
506 | if (sk && sk->sk_state != TCP_TIME_WAIT) { | |
507 | read_lock_bh(&sk->sk_callback_lock); | |
508 | if (sk->sk_socket && sk->sk_socket->file) { | |
509 | struct file *file = sk->sk_socket->file; | |
437589a7 LT |
510 | const struct cred *cred = file->f_cred; |
511 | struct user_namespace *user_ns = inst->peer_user_ns; | |
512 | __be32 uid = htonl(from_kuid_munged(user_ns, cred->fsuid)); | |
513 | __be32 gid = htonl(from_kgid_munged(user_ns, cred->fsgid)); | |
0626af31 | 514 | read_unlock_bh(&sk->sk_callback_lock); |
1db20a52 DM |
515 | if (nla_put_be32(inst->skb, NFULA_UID, uid) || |
516 | nla_put_be32(inst->skb, NFULA_GID, gid)) | |
517 | goto nla_put_failure; | |
0597f268 | 518 | } else |
0626af31 | 519 | read_unlock_bh(&sk->sk_callback_lock); |
0597f268 HW |
520 | } |
521 | ||
0af5f6c1 | 522 | /* local sequence number */ |
1db20a52 DM |
523 | if ((inst->flags & NFULNL_CFG_F_SEQ) && |
524 | nla_put_be32(inst->skb, NFULA_SEQ, htonl(inst->seq++))) | |
525 | goto nla_put_failure; | |
0dfedd28 | 526 | |
0af5f6c1 | 527 | /* global sequence number */ |
1db20a52 DM |
528 | if ((inst->flags & NFULNL_CFG_F_SEQ_GLOBAL) && |
529 | nla_put_be32(inst->skb, NFULA_SEQ_GLOBAL, | |
530 | htonl(atomic_inc_return(&global_seq)))) | |
531 | goto nla_put_failure; | |
0af5f6c1 | 532 | |
0597f268 | 533 | if (data_len) { |
df6fb868 PM |
534 | struct nlattr *nla; |
535 | int size = nla_attr_size(data_len); | |
0597f268 | 536 | |
df6fb868 | 537 | if (skb_tailroom(inst->skb) < nla_total_size(data_len)) { |
0597f268 | 538 | printk(KERN_WARNING "nfnetlink_log: no tailroom!\n"); |
d550d095 | 539 | return -1; |
0597f268 HW |
540 | } |
541 | ||
df6fb868 PM |
542 | nla = (struct nlattr *)skb_put(inst->skb, nla_total_size(data_len)); |
543 | nla->nla_type = NFULA_PAYLOAD; | |
544 | nla->nla_len = size; | |
0597f268 | 545 | |
df6fb868 | 546 | if (skb_copy_bits(skb, 0, nla_data(nla), data_len)) |
0597f268 HW |
547 | BUG(); |
548 | } | |
601e68e1 | 549 | |
0597f268 HW |
550 | nlh->nlmsg_len = inst->skb->tail - old_tail; |
551 | return 0; | |
552 | ||
df6fb868 | 553 | nla_put_failure: |
0597f268 HW |
554 | PRINTR(KERN_ERR "nfnetlink_log: error creating log nlmsg\n"); |
555 | return -1; | |
556 | } | |
557 | ||
558 | #define RCV_SKB_FAIL(err) do { netlink_ack(skb, nlh, (err)); return; } while (0) | |
559 | ||
560 | static struct nf_loginfo default_loginfo = { | |
561 | .type = NF_LOG_TYPE_ULOG, | |
562 | .u = { | |
563 | .ulog = { | |
564 | .copy_len = 0xffff, | |
565 | .group = 0, | |
566 | .qthreshold = 1, | |
567 | }, | |
568 | }, | |
569 | }; | |
570 | ||
571 | /* log handler for internal netfilter logging api */ | |
5f7340ef | 572 | void |
76108cea | 573 | nfulnl_log_packet(u_int8_t pf, |
0597f268 HW |
574 | unsigned int hooknum, |
575 | const struct sk_buff *skb, | |
576 | const struct net_device *in, | |
577 | const struct net_device *out, | |
578 | const struct nf_loginfo *li_user, | |
579 | const char *prefix) | |
580 | { | |
581 | unsigned int size, data_len; | |
582 | struct nfulnl_instance *inst; | |
583 | const struct nf_loginfo *li; | |
584 | unsigned int qthreshold; | |
d7a5c324 | 585 | unsigned int plen; |
0597f268 | 586 | |
601e68e1 | 587 | if (li_user && li_user->type == NF_LOG_TYPE_ULOG) |
0597f268 HW |
588 | li = li_user; |
589 | else | |
590 | li = &default_loginfo; | |
591 | ||
592 | inst = instance_lookup_get(li->u.ulog.group); | |
593 | if (!inst) | |
0597f268 | 594 | return; |
0597f268 | 595 | |
d7a5c324 PM |
596 | plen = 0; |
597 | if (prefix) | |
881dbfe8 | 598 | plen = strlen(prefix) + 1; |
d7a5c324 | 599 | |
0597f268 HW |
600 | /* FIXME: do we want to make the size calculation conditional based on |
601 | * what is actually present? way more branches and checks, but more | |
602 | * memory efficient... */ | |
7000d38d | 603 | size = NLMSG_SPACE(sizeof(struct nfgenmsg)) |
df6fb868 PM |
604 | + nla_total_size(sizeof(struct nfulnl_msg_packet_hdr)) |
605 | + nla_total_size(sizeof(u_int32_t)) /* ifindex */ | |
606 | + nla_total_size(sizeof(u_int32_t)) /* ifindex */ | |
fbcd923c | 607 | #ifdef CONFIG_BRIDGE_NETFILTER |
df6fb868 PM |
608 | + nla_total_size(sizeof(u_int32_t)) /* ifindex */ |
609 | + nla_total_size(sizeof(u_int32_t)) /* ifindex */ | |
fbcd923c | 610 | #endif |
df6fb868 PM |
611 | + nla_total_size(sizeof(u_int32_t)) /* mark */ |
612 | + nla_total_size(sizeof(u_int32_t)) /* uid */ | |
76aa1ce1 | 613 | + nla_total_size(sizeof(u_int32_t)) /* gid */ |
df6fb868 PM |
614 | + nla_total_size(plen) /* prefix */ |
615 | + nla_total_size(sizeof(struct nfulnl_msg_packet_hw)) | |
616 | + nla_total_size(sizeof(struct nfulnl_msg_packet_timestamp)); | |
0597f268 | 617 | |
eeff9bee PNA |
618 | if (in && skb_mac_header_was_set(skb)) { |
619 | size += nla_total_size(skb->dev->hard_header_len) | |
620 | + nla_total_size(sizeof(u_int16_t)) /* hwtype */ | |
621 | + nla_total_size(sizeof(u_int16_t)); /* hwlen */ | |
622 | } | |
623 | ||
0597f268 HW |
624 | spin_lock_bh(&inst->lock); |
625 | ||
0af5f6c1 | 626 | if (inst->flags & NFULNL_CFG_F_SEQ) |
df6fb868 | 627 | size += nla_total_size(sizeof(u_int32_t)); |
0af5f6c1 | 628 | if (inst->flags & NFULNL_CFG_F_SEQ_GLOBAL) |
df6fb868 | 629 | size += nla_total_size(sizeof(u_int32_t)); |
0af5f6c1 | 630 | |
0597f268 HW |
631 | qthreshold = inst->qthreshold; |
632 | /* per-rule qthreshold overrides per-instance */ | |
5ca431f9 EL |
633 | if (li->u.ulog.qthreshold) |
634 | if (qthreshold > li->u.ulog.qthreshold) | |
635 | qthreshold = li->u.ulog.qthreshold; | |
636 | ||
601e68e1 | 637 | |
0597f268 HW |
638 | switch (inst->copy_mode) { |
639 | case NFULNL_COPY_META: | |
640 | case NFULNL_COPY_NONE: | |
641 | data_len = 0; | |
642 | break; | |
601e68e1 | 643 | |
0597f268 | 644 | case NFULNL_COPY_PACKET: |
601e68e1 | 645 | if (inst->copy_range == 0 |
0597f268 HW |
646 | || inst->copy_range > skb->len) |
647 | data_len = skb->len; | |
648 | else | |
649 | data_len = inst->copy_range; | |
601e68e1 | 650 | |
df6fb868 | 651 | size += nla_total_size(data_len); |
0597f268 | 652 | break; |
601e68e1 | 653 | |
f5c5440d | 654 | case NFULNL_COPY_DISABLED: |
0597f268 | 655 | default: |
55b5a91e | 656 | goto unlock_and_release; |
0597f268 HW |
657 | } |
658 | ||
d63b043d MM |
659 | if (inst->skb && |
660 | size > skb_tailroom(inst->skb) - sizeof(struct nfgenmsg)) { | |
0597f268 HW |
661 | /* either the queue len is too high or we don't have |
662 | * enough room in the skb left. flush to userspace. */ | |
e3567061 | 663 | __nfulnl_flush(inst); |
55b5a91e | 664 | } |
0597f268 | 665 | |
55b5a91e MM |
666 | if (!inst->skb) { |
667 | inst->skb = nfulnl_alloc_skb(inst->nlbufsiz, size); | |
668 | if (!inst->skb) | |
0597f268 | 669 | goto alloc_failure; |
0597f268 HW |
670 | } |
671 | ||
0597f268 HW |
672 | inst->qlen++; |
673 | ||
674 | __build_packet_message(inst, skb, data_len, pf, | |
8248779b | 675 | hooknum, in, out, prefix, plen); |
0597f268 | 676 | |
d63b043d MM |
677 | if (inst->qlen >= qthreshold) |
678 | __nfulnl_flush(inst); | |
0597f268 HW |
679 | /* timer_pending always called within inst->lock, so there |
680 | * is no chance of a race here */ | |
d63b043d | 681 | else if (!timer_pending(&inst->timer)) { |
0597f268 HW |
682 | instance_get(inst); |
683 | inst->timer.expires = jiffies + (inst->flushtimeout*HZ/100); | |
684 | add_timer(&inst->timer); | |
685 | } | |
0597f268 | 686 | |
ed32abea MM |
687 | unlock_and_release: |
688 | spin_unlock_bh(&inst->lock); | |
689 | instance_put(inst); | |
0597f268 HW |
690 | return; |
691 | ||
692 | alloc_failure: | |
0597f268 | 693 | /* FIXME: statistics */ |
ed32abea | 694 | goto unlock_and_release; |
0597f268 | 695 | } |
5f7340ef | 696 | EXPORT_SYMBOL_GPL(nfulnl_log_packet); |
0597f268 HW |
697 | |
698 | static int | |
699 | nfulnl_rcv_nl_event(struct notifier_block *this, | |
700 | unsigned long event, void *ptr) | |
701 | { | |
702 | struct netlink_notify *n = ptr; | |
703 | ||
dee5817e | 704 | if (event == NETLINK_URELEASE && n->protocol == NETLINK_NETFILTER) { |
0597f268 HW |
705 | int i; |
706 | ||
15e47304 | 707 | /* destroy all instances for this portid */ |
bed1be20 | 708 | spin_lock_bh(&instances_lock); |
0597f268 HW |
709 | for (i = 0; i < INSTANCE_BUCKETS; i++) { |
710 | struct hlist_node *tmp, *t2; | |
711 | struct nfulnl_instance *inst; | |
712 | struct hlist_head *head = &instance_table[i]; | |
713 | ||
714 | hlist_for_each_entry_safe(inst, tmp, t2, head, hlist) { | |
09ad9bc7 | 715 | if ((net_eq(n->net, &init_net)) && |
15e47304 | 716 | (n->portid == inst->peer_portid)) |
0597f268 HW |
717 | __instance_destroy(inst); |
718 | } | |
719 | } | |
bed1be20 | 720 | spin_unlock_bh(&instances_lock); |
0597f268 HW |
721 | } |
722 | return NOTIFY_DONE; | |
723 | } | |
724 | ||
725 | static struct notifier_block nfulnl_rtnl_notifier = { | |
726 | .notifier_call = nfulnl_rcv_nl_event, | |
727 | }; | |
728 | ||
729 | static int | |
730 | nfulnl_recv_unsupp(struct sock *ctnl, struct sk_buff *skb, | |
39938324 PM |
731 | const struct nlmsghdr *nlh, |
732 | const struct nlattr * const nfqa[]) | |
0597f268 HW |
733 | { |
734 | return -ENOTSUPP; | |
735 | } | |
736 | ||
ca735b3a | 737 | static struct nf_logger nfulnl_logger __read_mostly = { |
0597f268 HW |
738 | .name = "nfnetlink_log", |
739 | .logfn = &nfulnl_log_packet, | |
740 | .me = THIS_MODULE, | |
741 | }; | |
742 | ||
fd8281ad PM |
743 | static const struct nla_policy nfula_cfg_policy[NFULA_CFG_MAX+1] = { |
744 | [NFULA_CFG_CMD] = { .len = sizeof(struct nfulnl_msg_config_cmd) }, | |
745 | [NFULA_CFG_MODE] = { .len = sizeof(struct nfulnl_msg_config_mode) }, | |
746 | [NFULA_CFG_TIMEOUT] = { .type = NLA_U32 }, | |
747 | [NFULA_CFG_QTHRESH] = { .type = NLA_U32 }, | |
748 | [NFULA_CFG_NLBUFSIZ] = { .type = NLA_U32 }, | |
749 | [NFULA_CFG_FLAGS] = { .type = NLA_U16 }, | |
0597f268 HW |
750 | }; |
751 | ||
752 | static int | |
753 | nfulnl_recv_config(struct sock *ctnl, struct sk_buff *skb, | |
39938324 PM |
754 | const struct nlmsghdr *nlh, |
755 | const struct nlattr * const nfula[]) | |
0597f268 | 756 | { |
d550d095 | 757 | struct nfgenmsg *nfmsg = nlmsg_data(nlh); |
0597f268 HW |
758 | u_int16_t group_num = ntohs(nfmsg->res_id); |
759 | struct nfulnl_instance *inst; | |
b7047a1c | 760 | struct nfulnl_msg_config_cmd *cmd = NULL; |
0597f268 HW |
761 | int ret = 0; |
762 | ||
b7047a1c PM |
763 | if (nfula[NFULA_CFG_CMD]) { |
764 | u_int8_t pf = nfmsg->nfgen_family; | |
765 | cmd = nla_data(nfula[NFULA_CFG_CMD]); | |
766 | ||
767 | /* Commands without queue context */ | |
768 | switch (cmd->command) { | |
769 | case NFULNL_CFG_CMD_PF_BIND: | |
ca735b3a | 770 | return nf_log_bind_pf(pf, &nfulnl_logger); |
b7047a1c | 771 | case NFULNL_CFG_CMD_PF_UNBIND: |
ca735b3a | 772 | nf_log_unbind_pf(pf); |
b7047a1c PM |
773 | return 0; |
774 | } | |
775 | } | |
776 | ||
0597f268 | 777 | inst = instance_lookup_get(group_num); |
15e47304 | 778 | if (inst && inst->peer_portid != NETLINK_CB(skb).portid) { |
c0506365 PM |
779 | ret = -EPERM; |
780 | goto out_put; | |
781 | } | |
782 | ||
b7047a1c | 783 | if (cmd != NULL) { |
0597f268 HW |
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, | |
15e47304 | 792 | NETLINK_CB(skb).portid, |
9eea9515 | 793 | sk_user_ns(NETLINK_CB(skb).ssk)); |
baab2ce7 PM |
794 | if (IS_ERR(inst)) { |
795 | ret = PTR_ERR(inst); | |
f414c16c | 796 | goto out; |
0597f268 HW |
797 | } |
798 | break; | |
799 | case NFULNL_CFG_CMD_UNBIND: | |
800 | if (!inst) { | |
801 | ret = -ENODEV; | |
f414c16c | 802 | goto out; |
0597f268 HW |
803 | } |
804 | ||
0597f268 | 805 | instance_destroy(inst); |
a49c6503 | 806 | goto out_put; |
0597f268 | 807 | default: |
cd21f0ac | 808 | ret = -ENOTSUPP; |
0597f268 HW |
809 | break; |
810 | } | |
0597f268 HW |
811 | } |
812 | ||
df6fb868 | 813 | if (nfula[NFULA_CFG_MODE]) { |
0597f268 | 814 | struct nfulnl_msg_config_mode *params; |
df6fb868 | 815 | params = nla_data(nfula[NFULA_CFG_MODE]); |
0597f268 | 816 | |
c0506365 PM |
817 | if (!inst) { |
818 | ret = -ENODEV; | |
819 | goto out; | |
820 | } | |
0597f268 | 821 | nfulnl_set_mode(inst, params->copy_mode, |
d1208b99 | 822 | ntohl(params->copy_range)); |
0597f268 HW |
823 | } |
824 | ||
df6fb868 | 825 | if (nfula[NFULA_CFG_TIMEOUT]) { |
0dfedd28 | 826 | __be32 timeout = nla_get_be32(nfula[NFULA_CFG_TIMEOUT]); |
0597f268 | 827 | |
c0506365 PM |
828 | if (!inst) { |
829 | ret = -ENODEV; | |
830 | goto out; | |
831 | } | |
0597f268 HW |
832 | nfulnl_set_timeout(inst, ntohl(timeout)); |
833 | } | |
834 | ||
df6fb868 | 835 | if (nfula[NFULA_CFG_NLBUFSIZ]) { |
0dfedd28 | 836 | __be32 nlbufsiz = nla_get_be32(nfula[NFULA_CFG_NLBUFSIZ]); |
0597f268 | 837 | |
c0506365 PM |
838 | if (!inst) { |
839 | ret = -ENODEV; | |
840 | goto out; | |
841 | } | |
0597f268 HW |
842 | nfulnl_set_nlbufsiz(inst, ntohl(nlbufsiz)); |
843 | } | |
844 | ||
df6fb868 | 845 | if (nfula[NFULA_CFG_QTHRESH]) { |
0dfedd28 | 846 | __be32 qthresh = nla_get_be32(nfula[NFULA_CFG_QTHRESH]); |
0597f268 | 847 | |
c0506365 PM |
848 | if (!inst) { |
849 | ret = -ENODEV; | |
850 | goto out; | |
851 | } | |
0597f268 HW |
852 | nfulnl_set_qthresh(inst, ntohl(qthresh)); |
853 | } | |
854 | ||
df6fb868 | 855 | if (nfula[NFULA_CFG_FLAGS]) { |
0dfedd28 | 856 | __be16 flags = nla_get_be16(nfula[NFULA_CFG_FLAGS]); |
c0506365 PM |
857 | |
858 | if (!inst) { | |
859 | ret = -ENODEV; | |
860 | goto out; | |
861 | } | |
ee433530 | 862 | nfulnl_set_flags(inst, ntohs(flags)); |
0af5f6c1 HW |
863 | } |
864 | ||
0597f268 HW |
865 | out_put: |
866 | instance_put(inst); | |
dd16704e | 867 | out: |
0597f268 HW |
868 | return ret; |
869 | } | |
870 | ||
7c8d4cb4 | 871 | static const struct nfnl_callback nfulnl_cb[NFULNL_MSG_MAX] = { |
0597f268 | 872 | [NFULNL_MSG_PACKET] = { .call = nfulnl_recv_unsupp, |
37d2e7a2 | 873 | .attr_count = NFULA_MAX, }, |
0597f268 | 874 | [NFULNL_MSG_CONFIG] = { .call = nfulnl_recv_config, |
fd8281ad PM |
875 | .attr_count = NFULA_CFG_MAX, |
876 | .policy = nfula_cfg_policy }, | |
0597f268 HW |
877 | }; |
878 | ||
7c8d4cb4 | 879 | static const struct nfnetlink_subsystem nfulnl_subsys = { |
0597f268 HW |
880 | .name = "log", |
881 | .subsys_id = NFNL_SUBSYS_ULOG, | |
882 | .cb_count = NFULNL_MSG_MAX, | |
0597f268 HW |
883 | .cb = nfulnl_cb, |
884 | }; | |
885 | ||
886 | #ifdef CONFIG_PROC_FS | |
887 | struct iter_state { | |
888 | unsigned int bucket; | |
889 | }; | |
890 | ||
f76cdcee | 891 | static struct hlist_node *get_first(struct iter_state *st) |
0597f268 | 892 | { |
0597f268 HW |
893 | if (!st) |
894 | return NULL; | |
895 | ||
896 | for (st->bucket = 0; st->bucket < INSTANCE_BUCKETS; st->bucket++) { | |
897 | if (!hlist_empty(&instance_table[st->bucket])) | |
0e60ebe0 | 898 | return rcu_dereference_bh(hlist_first_rcu(&instance_table[st->bucket])); |
0597f268 HW |
899 | } |
900 | return NULL; | |
901 | } | |
902 | ||
f76cdcee | 903 | static struct hlist_node *get_next(struct iter_state *st, struct hlist_node *h) |
0597f268 | 904 | { |
0e60ebe0 | 905 | h = rcu_dereference_bh(hlist_next_rcu(h)); |
0597f268 HW |
906 | while (!h) { |
907 | if (++st->bucket >= INSTANCE_BUCKETS) | |
908 | return NULL; | |
909 | ||
0e60ebe0 | 910 | h = rcu_dereference_bh(hlist_first_rcu(&instance_table[st->bucket])); |
0597f268 HW |
911 | } |
912 | return h; | |
913 | } | |
914 | ||
f76cdcee | 915 | static struct hlist_node *get_idx(struct iter_state *st, loff_t pos) |
0597f268 HW |
916 | { |
917 | struct hlist_node *head; | |
f76cdcee | 918 | head = get_first(st); |
0597f268 HW |
919 | |
920 | if (head) | |
f76cdcee | 921 | while (pos && (head = get_next(st, head))) |
0597f268 HW |
922 | pos--; |
923 | return pos ? NULL : head; | |
924 | } | |
925 | ||
926 | static void *seq_start(struct seq_file *seq, loff_t *pos) | |
bed1be20 | 927 | __acquires(rcu_bh) |
0597f268 | 928 | { |
bed1be20 | 929 | rcu_read_lock_bh(); |
f76cdcee | 930 | return get_idx(seq->private, *pos); |
0597f268 HW |
931 | } |
932 | ||
933 | static void *seq_next(struct seq_file *s, void *v, loff_t *pos) | |
934 | { | |
935 | (*pos)++; | |
f76cdcee | 936 | return get_next(s->private, v); |
0597f268 HW |
937 | } |
938 | ||
939 | static void seq_stop(struct seq_file *s, void *v) | |
bed1be20 | 940 | __releases(rcu_bh) |
0597f268 | 941 | { |
bed1be20 | 942 | rcu_read_unlock_bh(); |
0597f268 HW |
943 | } |
944 | ||
945 | static int seq_show(struct seq_file *s, void *v) | |
946 | { | |
947 | const struct nfulnl_instance *inst = v; | |
948 | ||
601e68e1 | 949 | return seq_printf(s, "%5d %6d %5d %1d %5d %6d %2d\n", |
0597f268 | 950 | inst->group_num, |
15e47304 | 951 | inst->peer_portid, inst->qlen, |
0597f268 HW |
952 | inst->copy_mode, inst->copy_range, |
953 | inst->flushtimeout, atomic_read(&inst->use)); | |
954 | } | |
955 | ||
56b3d975 | 956 | static const struct seq_operations nful_seq_ops = { |
0597f268 HW |
957 | .start = seq_start, |
958 | .next = seq_next, | |
959 | .stop = seq_stop, | |
960 | .show = seq_show, | |
961 | }; | |
962 | ||
963 | static int nful_open(struct inode *inode, struct file *file) | |
964 | { | |
e2da5913 PE |
965 | return seq_open_private(file, &nful_seq_ops, |
966 | sizeof(struct iter_state)); | |
0597f268 HW |
967 | } |
968 | ||
da7071d7 | 969 | static const struct file_operations nful_file_ops = { |
0597f268 HW |
970 | .owner = THIS_MODULE, |
971 | .open = nful_open, | |
972 | .read = seq_read, | |
973 | .llseek = seq_lseek, | |
974 | .release = seq_release_private, | |
975 | }; | |
976 | ||
977 | #endif /* PROC_FS */ | |
978 | ||
32292a7f | 979 | static int __init nfnetlink_log_init(void) |
0597f268 HW |
980 | { |
981 | int i, status = -ENOMEM; | |
601e68e1 | 982 | |
0597f268 HW |
983 | for (i = 0; i < INSTANCE_BUCKETS; i++) |
984 | INIT_HLIST_HEAD(&instance_table[i]); | |
601e68e1 | 985 | |
0597f268 HW |
986 | /* it's not really all that important to have a random value, so |
987 | * we can do this from the init function, even if there hasn't | |
988 | * been that much entropy yet */ | |
989 | get_random_bytes(&hash_init, sizeof(hash_init)); | |
990 | ||
991 | netlink_register_notifier(&nfulnl_rtnl_notifier); | |
992 | status = nfnetlink_subsys_register(&nfulnl_subsys); | |
993 | if (status < 0) { | |
994 | printk(KERN_ERR "log: failed to create netlink socket\n"); | |
995 | goto cleanup_netlink_notifier; | |
996 | } | |
997 | ||
ca735b3a EL |
998 | status = nf_log_register(NFPROTO_UNSPEC, &nfulnl_logger); |
999 | if (status < 0) { | |
1000 | printk(KERN_ERR "log: failed to register logger\n"); | |
1001 | goto cleanup_subsys; | |
1002 | } | |
1003 | ||
0597f268 | 1004 | #ifdef CONFIG_PROC_FS |
8eeee8b1 | 1005 | if (!proc_create("nfnetlink_log", 0440, |
6fc09f10 JL |
1006 | proc_net_netfilter, &nful_file_ops)) { |
1007 | status = -ENOMEM; | |
ca735b3a | 1008 | goto cleanup_logger; |
6fc09f10 | 1009 | } |
0597f268 | 1010 | #endif |
0597f268 HW |
1011 | return status; |
1012 | ||
0597f268 | 1013 | #ifdef CONFIG_PROC_FS |
ca735b3a EL |
1014 | cleanup_logger: |
1015 | nf_log_unregister(&nfulnl_logger); | |
1016 | #endif | |
0597f268 | 1017 | cleanup_subsys: |
0597f268 HW |
1018 | nfnetlink_subsys_unregister(&nfulnl_subsys); |
1019 | cleanup_netlink_notifier: | |
1020 | netlink_unregister_notifier(&nfulnl_rtnl_notifier); | |
1021 | return status; | |
1022 | } | |
1023 | ||
65b4b4e8 | 1024 | static void __exit nfnetlink_log_fini(void) |
0597f268 | 1025 | { |
e92ad99c | 1026 | nf_log_unregister(&nfulnl_logger); |
32292a7f PM |
1027 | #ifdef CONFIG_PROC_FS |
1028 | remove_proc_entry("nfnetlink_log", proc_net_netfilter); | |
1029 | #endif | |
1030 | nfnetlink_subsys_unregister(&nfulnl_subsys); | |
1031 | netlink_unregister_notifier(&nfulnl_rtnl_notifier); | |
0597f268 HW |
1032 | } |
1033 | ||
1034 | MODULE_DESCRIPTION("netfilter userspace logging"); | |
1035 | MODULE_AUTHOR("Harald Welte <laforge@netfilter.org>"); | |
1036 | MODULE_LICENSE("GPL"); | |
f682faef | 1037 | MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_ULOG); |
0597f268 | 1038 | |
65b4b4e8 AM |
1039 | module_init(nfnetlink_log_init); |
1040 | module_exit(nfnetlink_log_fini); |