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> | |
e035edd1 | 16 | #include <linux/if_arp.h> |
0597f268 HW |
17 | #include <linux/init.h> |
18 | #include <linux/ip.h> | |
19 | #include <linux/ipv6.h> | |
20 | #include <linux/netdevice.h> | |
21 | #include <linux/netfilter.h> | |
22 | #include <linux/netlink.h> | |
23 | #include <linux/netfilter/nfnetlink.h> | |
24 | #include <linux/netfilter/nfnetlink_log.h> | |
25 | #include <linux/spinlock.h> | |
26 | #include <linux/sysctl.h> | |
27 | #include <linux/proc_fs.h> | |
28 | #include <linux/security.h> | |
29 | #include <linux/list.h> | |
30 | #include <linux/jhash.h> | |
31 | #include <linux/random.h> | |
5a0e3ad6 | 32 | #include <linux/slab.h> |
0597f268 | 33 | #include <net/sock.h> |
f01ffbd6 | 34 | #include <net/netfilter/nf_log.h> |
d9e15007 | 35 | #include <net/netfilter/nfnetlink_log.h> |
0597f268 | 36 | |
60063497 | 37 | #include <linux/atomic.h> |
0597f268 | 38 | |
fbcd923c HW |
39 | #ifdef CONFIG_BRIDGE_NETFILTER |
40 | #include "../bridge/br_private.h" | |
41 | #endif | |
42 | ||
c2db2924 | 43 | #define NFULNL_NLBUFSIZ_DEFAULT NLMSG_GOODSIZE |
2c6764b7 | 44 | #define NFULNL_TIMEOUT_DEFAULT 100 /* every second */ |
0597f268 | 45 | #define NFULNL_QTHRESH_DEFAULT 100 /* 100 packets */ |
6b6ec99a | 46 | #define NFULNL_COPY_RANGE_MAX 0xFFFF /* max packet size is limited by 16-bit struct nfattr nfa_len field */ |
0597f268 HW |
47 | |
48 | #define PRINTR(x, args...) do { if (net_ratelimit()) \ | |
49 | printk(x, ## args); } while (0); | |
50 | ||
0597f268 HW |
51 | struct nfulnl_instance { |
52 | struct hlist_node hlist; /* global list of instances */ | |
53 | spinlock_t lock; | |
54 | atomic_t use; /* use count */ | |
55 | ||
56 | unsigned int qlen; /* number of nlmsgs in skb */ | |
57 | struct sk_buff *skb; /* pre-allocatd skb */ | |
0597f268 | 58 | struct timer_list timer; |
9eea9515 | 59 | struct user_namespace *peer_user_ns; /* User namespace of the peer process */ |
15e47304 | 60 | int peer_portid; /* PORTID of the peer process */ |
0597f268 HW |
61 | |
62 | /* configurable parameters */ | |
63 | unsigned int flushtimeout; /* timeout until queue flush */ | |
64 | unsigned int nlbufsiz; /* netlink buffer allocation size */ | |
65 | unsigned int qthreshold; /* threshold of the queue */ | |
66 | u_int32_t copy_range; | |
0af5f6c1 | 67 | u_int32_t seq; /* instance-local sequential counter */ |
0597f268 | 68 | u_int16_t group_num; /* number of this queue */ |
0af5f6c1 | 69 | u_int16_t flags; |
601e68e1 | 70 | u_int8_t copy_mode; |
bed1be20 | 71 | struct rcu_head rcu; |
0597f268 HW |
72 | }; |
73 | ||
bed1be20 | 74 | static DEFINE_SPINLOCK(instances_lock); |
0af5f6c1 | 75 | static atomic_t global_seq; |
0597f268 HW |
76 | |
77 | #define INSTANCE_BUCKETS 16 | |
78 | static struct hlist_head instance_table[INSTANCE_BUCKETS]; | |
79 | static unsigned int hash_init; | |
80 | ||
81 | static inline u_int8_t instance_hashfn(u_int16_t group_num) | |
82 | { | |
83 | return ((group_num & 0xff) % INSTANCE_BUCKETS); | |
84 | } | |
85 | ||
86 | static struct nfulnl_instance * | |
87 | __instance_lookup(u_int16_t group_num) | |
88 | { | |
89 | struct hlist_head *head; | |
0597f268 HW |
90 | struct nfulnl_instance *inst; |
91 | ||
0597f268 | 92 | head = &instance_table[instance_hashfn(group_num)]; |
b67bfe0d | 93 | hlist_for_each_entry_rcu(inst, 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; |
0c36b48b | 387 | const unsigned char *hwhdrp; |
0597f268 | 388 | |
d550d095 | 389 | nlh = nlmsg_put(inst->skb, 0, 0, |
0597f268 | 390 | NFNL_SUBSYS_ULOG << 8 | NFULNL_MSG_PACKET, |
d550d095 DM |
391 | sizeof(struct nfgenmsg), 0); |
392 | if (!nlh) | |
393 | return -1; | |
394 | nfmsg = nlmsg_data(nlh); | |
0597f268 HW |
395 | nfmsg->nfgen_family = pf; |
396 | nfmsg->version = NFNETLINK_V0; | |
397 | nfmsg->res_id = htons(inst->group_num); | |
398 | ||
febf0a43 | 399 | pmsg.hw_protocol = skb->protocol; |
0597f268 HW |
400 | pmsg.hook = hooknum; |
401 | ||
1db20a52 DM |
402 | if (nla_put(inst->skb, NFULA_PACKET_HDR, sizeof(pmsg), &pmsg)) |
403 | goto nla_put_failure; | |
0597f268 | 404 | |
1db20a52 DM |
405 | if (prefix && |
406 | nla_put(inst->skb, NFULA_PREFIX, plen, prefix)) | |
407 | goto nla_put_failure; | |
0597f268 HW |
408 | |
409 | if (indev) { | |
fbcd923c | 410 | #ifndef CONFIG_BRIDGE_NETFILTER |
1db20a52 DM |
411 | if (nla_put_be32(inst->skb, NFULA_IFINDEX_INDEV, |
412 | htonl(indev->ifindex))) | |
413 | goto nla_put_failure; | |
fbcd923c HW |
414 | #else |
415 | if (pf == PF_BRIDGE) { | |
416 | /* Case 1: outdev is physical input device, we need to | |
417 | * look for bridge group (when called from | |
418 | * netfilter_bridge) */ | |
1db20a52 DM |
419 | if (nla_put_be32(inst->skb, NFULA_IFINDEX_PHYSINDEV, |
420 | htonl(indev->ifindex)) || | |
fbcd923c | 421 | /* this is the bridge group "brX" */ |
f350a0a8 | 422 | /* rcu_read_lock()ed by nf_hook_slow or nf_log_packet */ |
1db20a52 DM |
423 | nla_put_be32(inst->skb, NFULA_IFINDEX_INDEV, |
424 | htonl(br_port_get_rcu(indev)->br->dev->ifindex))) | |
425 | goto nla_put_failure; | |
fbcd923c HW |
426 | } else { |
427 | /* Case 2: indev is bridge group, we need to look for | |
428 | * physical device (when called from ipv4) */ | |
1db20a52 DM |
429 | if (nla_put_be32(inst->skb, NFULA_IFINDEX_INDEV, |
430 | htonl(indev->ifindex))) | |
431 | goto nla_put_failure; | |
432 | if (skb->nf_bridge && skb->nf_bridge->physindev && | |
433 | nla_put_be32(inst->skb, NFULA_IFINDEX_PHYSINDEV, | |
434 | htonl(skb->nf_bridge->physindev->ifindex))) | |
435 | goto nla_put_failure; | |
fbcd923c HW |
436 | } |
437 | #endif | |
0597f268 HW |
438 | } |
439 | ||
440 | if (outdev) { | |
fbcd923c | 441 | #ifndef CONFIG_BRIDGE_NETFILTER |
1db20a52 DM |
442 | if (nla_put_be32(inst->skb, NFULA_IFINDEX_OUTDEV, |
443 | htonl(outdev->ifindex))) | |
444 | goto nla_put_failure; | |
fbcd923c HW |
445 | #else |
446 | if (pf == PF_BRIDGE) { | |
447 | /* Case 1: outdev is physical output device, we need to | |
448 | * look for bridge group (when called from | |
449 | * netfilter_bridge) */ | |
1db20a52 DM |
450 | if (nla_put_be32(inst->skb, NFULA_IFINDEX_PHYSOUTDEV, |
451 | htonl(outdev->ifindex)) || | |
fbcd923c | 452 | /* this is the bridge group "brX" */ |
f350a0a8 | 453 | /* rcu_read_lock()ed by nf_hook_slow or nf_log_packet */ |
1db20a52 DM |
454 | nla_put_be32(inst->skb, NFULA_IFINDEX_OUTDEV, |
455 | htonl(br_port_get_rcu(outdev)->br->dev->ifindex))) | |
456 | goto nla_put_failure; | |
fbcd923c HW |
457 | } else { |
458 | /* Case 2: indev is a bridge group, we need to look | |
459 | * for physical device (when called from ipv4) */ | |
1db20a52 DM |
460 | if (nla_put_be32(inst->skb, NFULA_IFINDEX_OUTDEV, |
461 | htonl(outdev->ifindex))) | |
462 | goto nla_put_failure; | |
463 | if (skb->nf_bridge && skb->nf_bridge->physoutdev && | |
464 | nla_put_be32(inst->skb, NFULA_IFINDEX_PHYSOUTDEV, | |
465 | htonl(skb->nf_bridge->physoutdev->ifindex))) | |
466 | goto nla_put_failure; | |
fbcd923c HW |
467 | } |
468 | #endif | |
0597f268 HW |
469 | } |
470 | ||
1db20a52 DM |
471 | if (skb->mark && |
472 | nla_put_be32(inst->skb, NFULA_MARK, htonl(skb->mark))) | |
473 | goto nla_put_failure; | |
0597f268 | 474 | |
2c38de4c NC |
475 | if (indev && skb->dev && |
476 | skb->mac_header != skb->network_header) { | |
0597f268 | 477 | struct nfulnl_msg_packet_hw phw; |
b95cce35 SH |
478 | int len = dev_parse_header(skb, phw.hw_addr); |
479 | if (len > 0) { | |
480 | phw.hw_addrlen = htons(len); | |
1db20a52 DM |
481 | if (nla_put(inst->skb, NFULA_HWADDR, sizeof(phw), &phw)) |
482 | goto nla_put_failure; | |
b95cce35 | 483 | } |
0597f268 HW |
484 | } |
485 | ||
72961ecf | 486 | if (indev && skb_mac_header_was_set(skb)) { |
2dba62c3 | 487 | if (nla_put_be16(inst->skb, NFULA_HWTYPE, htons(skb->dev->type)) || |
1db20a52 | 488 | nla_put_be16(inst->skb, NFULA_HWLEN, |
0c36b48b BH |
489 | htons(skb->dev->hard_header_len))) |
490 | goto nla_put_failure; | |
491 | ||
492 | hwhdrp = skb_mac_header(skb); | |
493 | ||
494 | if (skb->dev->type == ARPHRD_SIT) | |
495 | hwhdrp -= ETH_HLEN; | |
496 | ||
497 | if (hwhdrp >= skb->head && | |
498 | nla_put(inst->skb, NFULA_HWHEADER, | |
499 | skb->dev->hard_header_len, hwhdrp)) | |
1db20a52 | 500 | goto nla_put_failure; |
72961ecf EL |
501 | } |
502 | ||
b7aa0bf7 | 503 | if (skb->tstamp.tv64) { |
0597f268 | 504 | struct nfulnl_msg_packet_timestamp ts; |
b7aa0bf7 ED |
505 | struct timeval tv = ktime_to_timeval(skb->tstamp); |
506 | ts.sec = cpu_to_be64(tv.tv_sec); | |
507 | ts.usec = cpu_to_be64(tv.tv_usec); | |
0597f268 | 508 | |
1db20a52 DM |
509 | if (nla_put(inst->skb, NFULA_TIMESTAMP, sizeof(ts), &ts)) |
510 | goto nla_put_failure; | |
0597f268 HW |
511 | } |
512 | ||
513 | /* UID */ | |
0626af31 ED |
514 | sk = skb->sk; |
515 | if (sk && sk->sk_state != TCP_TIME_WAIT) { | |
516 | read_lock_bh(&sk->sk_callback_lock); | |
517 | if (sk->sk_socket && sk->sk_socket->file) { | |
518 | struct file *file = sk->sk_socket->file; | |
437589a7 LT |
519 | const struct cred *cred = file->f_cred; |
520 | struct user_namespace *user_ns = inst->peer_user_ns; | |
521 | __be32 uid = htonl(from_kuid_munged(user_ns, cred->fsuid)); | |
522 | __be32 gid = htonl(from_kgid_munged(user_ns, cred->fsgid)); | |
0626af31 | 523 | read_unlock_bh(&sk->sk_callback_lock); |
1db20a52 DM |
524 | if (nla_put_be32(inst->skb, NFULA_UID, uid) || |
525 | nla_put_be32(inst->skb, NFULA_GID, gid)) | |
526 | goto nla_put_failure; | |
0597f268 | 527 | } else |
0626af31 | 528 | read_unlock_bh(&sk->sk_callback_lock); |
0597f268 HW |
529 | } |
530 | ||
0af5f6c1 | 531 | /* local sequence number */ |
1db20a52 DM |
532 | if ((inst->flags & NFULNL_CFG_F_SEQ) && |
533 | nla_put_be32(inst->skb, NFULA_SEQ, htonl(inst->seq++))) | |
534 | goto nla_put_failure; | |
0dfedd28 | 535 | |
0af5f6c1 | 536 | /* global sequence number */ |
1db20a52 DM |
537 | if ((inst->flags & NFULNL_CFG_F_SEQ_GLOBAL) && |
538 | nla_put_be32(inst->skb, NFULA_SEQ_GLOBAL, | |
539 | htonl(atomic_inc_return(&global_seq)))) | |
540 | goto nla_put_failure; | |
0af5f6c1 | 541 | |
0597f268 | 542 | if (data_len) { |
df6fb868 PM |
543 | struct nlattr *nla; |
544 | int size = nla_attr_size(data_len); | |
0597f268 | 545 | |
df6fb868 | 546 | if (skb_tailroom(inst->skb) < nla_total_size(data_len)) { |
0597f268 | 547 | printk(KERN_WARNING "nfnetlink_log: no tailroom!\n"); |
d550d095 | 548 | return -1; |
0597f268 HW |
549 | } |
550 | ||
df6fb868 PM |
551 | nla = (struct nlattr *)skb_put(inst->skb, nla_total_size(data_len)); |
552 | nla->nla_type = NFULA_PAYLOAD; | |
553 | nla->nla_len = size; | |
0597f268 | 554 | |
df6fb868 | 555 | if (skb_copy_bits(skb, 0, nla_data(nla), data_len)) |
0597f268 HW |
556 | BUG(); |
557 | } | |
601e68e1 | 558 | |
0597f268 HW |
559 | nlh->nlmsg_len = inst->skb->tail - old_tail; |
560 | return 0; | |
561 | ||
df6fb868 | 562 | nla_put_failure: |
0597f268 HW |
563 | PRINTR(KERN_ERR "nfnetlink_log: error creating log nlmsg\n"); |
564 | return -1; | |
565 | } | |
566 | ||
567 | #define RCV_SKB_FAIL(err) do { netlink_ack(skb, nlh, (err)); return; } while (0) | |
568 | ||
569 | static struct nf_loginfo default_loginfo = { | |
570 | .type = NF_LOG_TYPE_ULOG, | |
571 | .u = { | |
572 | .ulog = { | |
573 | .copy_len = 0xffff, | |
574 | .group = 0, | |
575 | .qthreshold = 1, | |
576 | }, | |
577 | }, | |
578 | }; | |
579 | ||
580 | /* log handler for internal netfilter logging api */ | |
5f7340ef | 581 | void |
76108cea | 582 | nfulnl_log_packet(u_int8_t pf, |
0597f268 HW |
583 | unsigned int hooknum, |
584 | const struct sk_buff *skb, | |
585 | const struct net_device *in, | |
586 | const struct net_device *out, | |
587 | const struct nf_loginfo *li_user, | |
588 | const char *prefix) | |
589 | { | |
590 | unsigned int size, data_len; | |
591 | struct nfulnl_instance *inst; | |
592 | const struct nf_loginfo *li; | |
593 | unsigned int qthreshold; | |
d7a5c324 | 594 | unsigned int plen; |
0597f268 | 595 | |
601e68e1 | 596 | if (li_user && li_user->type == NF_LOG_TYPE_ULOG) |
0597f268 HW |
597 | li = li_user; |
598 | else | |
599 | li = &default_loginfo; | |
600 | ||
601 | inst = instance_lookup_get(li->u.ulog.group); | |
602 | if (!inst) | |
0597f268 | 603 | return; |
0597f268 | 604 | |
d7a5c324 PM |
605 | plen = 0; |
606 | if (prefix) | |
881dbfe8 | 607 | plen = strlen(prefix) + 1; |
d7a5c324 | 608 | |
0597f268 HW |
609 | /* FIXME: do we want to make the size calculation conditional based on |
610 | * what is actually present? way more branches and checks, but more | |
611 | * memory efficient... */ | |
7000d38d | 612 | size = NLMSG_SPACE(sizeof(struct nfgenmsg)) |
df6fb868 PM |
613 | + nla_total_size(sizeof(struct nfulnl_msg_packet_hdr)) |
614 | + nla_total_size(sizeof(u_int32_t)) /* ifindex */ | |
615 | + nla_total_size(sizeof(u_int32_t)) /* ifindex */ | |
fbcd923c | 616 | #ifdef CONFIG_BRIDGE_NETFILTER |
df6fb868 PM |
617 | + nla_total_size(sizeof(u_int32_t)) /* ifindex */ |
618 | + nla_total_size(sizeof(u_int32_t)) /* ifindex */ | |
fbcd923c | 619 | #endif |
df6fb868 PM |
620 | + nla_total_size(sizeof(u_int32_t)) /* mark */ |
621 | + nla_total_size(sizeof(u_int32_t)) /* uid */ | |
76aa1ce1 | 622 | + nla_total_size(sizeof(u_int32_t)) /* gid */ |
df6fb868 PM |
623 | + nla_total_size(plen) /* prefix */ |
624 | + nla_total_size(sizeof(struct nfulnl_msg_packet_hw)) | |
625 | + nla_total_size(sizeof(struct nfulnl_msg_packet_timestamp)); | |
0597f268 | 626 | |
eeff9bee PNA |
627 | if (in && skb_mac_header_was_set(skb)) { |
628 | size += nla_total_size(skb->dev->hard_header_len) | |
629 | + nla_total_size(sizeof(u_int16_t)) /* hwtype */ | |
630 | + nla_total_size(sizeof(u_int16_t)); /* hwlen */ | |
631 | } | |
632 | ||
0597f268 HW |
633 | spin_lock_bh(&inst->lock); |
634 | ||
0af5f6c1 | 635 | if (inst->flags & NFULNL_CFG_F_SEQ) |
df6fb868 | 636 | size += nla_total_size(sizeof(u_int32_t)); |
0af5f6c1 | 637 | if (inst->flags & NFULNL_CFG_F_SEQ_GLOBAL) |
df6fb868 | 638 | size += nla_total_size(sizeof(u_int32_t)); |
0af5f6c1 | 639 | |
0597f268 HW |
640 | qthreshold = inst->qthreshold; |
641 | /* per-rule qthreshold overrides per-instance */ | |
5ca431f9 EL |
642 | if (li->u.ulog.qthreshold) |
643 | if (qthreshold > li->u.ulog.qthreshold) | |
644 | qthreshold = li->u.ulog.qthreshold; | |
645 | ||
601e68e1 | 646 | |
0597f268 HW |
647 | switch (inst->copy_mode) { |
648 | case NFULNL_COPY_META: | |
649 | case NFULNL_COPY_NONE: | |
650 | data_len = 0; | |
651 | break; | |
601e68e1 | 652 | |
0597f268 | 653 | case NFULNL_COPY_PACKET: |
601e68e1 | 654 | if (inst->copy_range == 0 |
0597f268 HW |
655 | || inst->copy_range > skb->len) |
656 | data_len = skb->len; | |
657 | else | |
658 | data_len = inst->copy_range; | |
601e68e1 | 659 | |
df6fb868 | 660 | size += nla_total_size(data_len); |
0597f268 | 661 | break; |
601e68e1 | 662 | |
f5c5440d | 663 | case NFULNL_COPY_DISABLED: |
0597f268 | 664 | default: |
55b5a91e | 665 | goto unlock_and_release; |
0597f268 HW |
666 | } |
667 | ||
d63b043d MM |
668 | if (inst->skb && |
669 | size > skb_tailroom(inst->skb) - sizeof(struct nfgenmsg)) { | |
0597f268 HW |
670 | /* either the queue len is too high or we don't have |
671 | * enough room in the skb left. flush to userspace. */ | |
e3567061 | 672 | __nfulnl_flush(inst); |
55b5a91e | 673 | } |
0597f268 | 674 | |
55b5a91e MM |
675 | if (!inst->skb) { |
676 | inst->skb = nfulnl_alloc_skb(inst->nlbufsiz, size); | |
677 | if (!inst->skb) | |
0597f268 | 678 | goto alloc_failure; |
0597f268 HW |
679 | } |
680 | ||
0597f268 HW |
681 | inst->qlen++; |
682 | ||
683 | __build_packet_message(inst, skb, data_len, pf, | |
8248779b | 684 | hooknum, in, out, prefix, plen); |
0597f268 | 685 | |
d63b043d MM |
686 | if (inst->qlen >= qthreshold) |
687 | __nfulnl_flush(inst); | |
0597f268 HW |
688 | /* timer_pending always called within inst->lock, so there |
689 | * is no chance of a race here */ | |
d63b043d | 690 | else if (!timer_pending(&inst->timer)) { |
0597f268 HW |
691 | instance_get(inst); |
692 | inst->timer.expires = jiffies + (inst->flushtimeout*HZ/100); | |
693 | add_timer(&inst->timer); | |
694 | } | |
0597f268 | 695 | |
ed32abea MM |
696 | unlock_and_release: |
697 | spin_unlock_bh(&inst->lock); | |
698 | instance_put(inst); | |
0597f268 HW |
699 | return; |
700 | ||
701 | alloc_failure: | |
0597f268 | 702 | /* FIXME: statistics */ |
ed32abea | 703 | goto unlock_and_release; |
0597f268 | 704 | } |
5f7340ef | 705 | EXPORT_SYMBOL_GPL(nfulnl_log_packet); |
0597f268 HW |
706 | |
707 | static int | |
708 | nfulnl_rcv_nl_event(struct notifier_block *this, | |
709 | unsigned long event, void *ptr) | |
710 | { | |
711 | struct netlink_notify *n = ptr; | |
712 | ||
dee5817e | 713 | if (event == NETLINK_URELEASE && n->protocol == NETLINK_NETFILTER) { |
0597f268 HW |
714 | int i; |
715 | ||
15e47304 | 716 | /* destroy all instances for this portid */ |
bed1be20 | 717 | spin_lock_bh(&instances_lock); |
0597f268 | 718 | for (i = 0; i < INSTANCE_BUCKETS; i++) { |
b67bfe0d | 719 | struct hlist_node *t2; |
0597f268 HW |
720 | struct nfulnl_instance *inst; |
721 | struct hlist_head *head = &instance_table[i]; | |
722 | ||
b67bfe0d | 723 | hlist_for_each_entry_safe(inst, t2, head, hlist) { |
09ad9bc7 | 724 | if ((net_eq(n->net, &init_net)) && |
15e47304 | 725 | (n->portid == inst->peer_portid)) |
0597f268 HW |
726 | __instance_destroy(inst); |
727 | } | |
728 | } | |
bed1be20 | 729 | spin_unlock_bh(&instances_lock); |
0597f268 HW |
730 | } |
731 | return NOTIFY_DONE; | |
732 | } | |
733 | ||
734 | static struct notifier_block nfulnl_rtnl_notifier = { | |
735 | .notifier_call = nfulnl_rcv_nl_event, | |
736 | }; | |
737 | ||
738 | static int | |
739 | nfulnl_recv_unsupp(struct sock *ctnl, struct sk_buff *skb, | |
39938324 PM |
740 | const struct nlmsghdr *nlh, |
741 | const struct nlattr * const nfqa[]) | |
0597f268 HW |
742 | { |
743 | return -ENOTSUPP; | |
744 | } | |
745 | ||
ca735b3a | 746 | static struct nf_logger nfulnl_logger __read_mostly = { |
0597f268 HW |
747 | .name = "nfnetlink_log", |
748 | .logfn = &nfulnl_log_packet, | |
749 | .me = THIS_MODULE, | |
750 | }; | |
751 | ||
fd8281ad PM |
752 | static const struct nla_policy nfula_cfg_policy[NFULA_CFG_MAX+1] = { |
753 | [NFULA_CFG_CMD] = { .len = sizeof(struct nfulnl_msg_config_cmd) }, | |
754 | [NFULA_CFG_MODE] = { .len = sizeof(struct nfulnl_msg_config_mode) }, | |
755 | [NFULA_CFG_TIMEOUT] = { .type = NLA_U32 }, | |
756 | [NFULA_CFG_QTHRESH] = { .type = NLA_U32 }, | |
757 | [NFULA_CFG_NLBUFSIZ] = { .type = NLA_U32 }, | |
758 | [NFULA_CFG_FLAGS] = { .type = NLA_U16 }, | |
0597f268 HW |
759 | }; |
760 | ||
761 | static int | |
762 | nfulnl_recv_config(struct sock *ctnl, struct sk_buff *skb, | |
39938324 PM |
763 | const struct nlmsghdr *nlh, |
764 | const struct nlattr * const nfula[]) | |
0597f268 | 765 | { |
d550d095 | 766 | struct nfgenmsg *nfmsg = nlmsg_data(nlh); |
0597f268 HW |
767 | u_int16_t group_num = ntohs(nfmsg->res_id); |
768 | struct nfulnl_instance *inst; | |
b7047a1c | 769 | struct nfulnl_msg_config_cmd *cmd = NULL; |
0597f268 HW |
770 | int ret = 0; |
771 | ||
b7047a1c PM |
772 | if (nfula[NFULA_CFG_CMD]) { |
773 | u_int8_t pf = nfmsg->nfgen_family; | |
774 | cmd = nla_data(nfula[NFULA_CFG_CMD]); | |
775 | ||
776 | /* Commands without queue context */ | |
777 | switch (cmd->command) { | |
778 | case NFULNL_CFG_CMD_PF_BIND: | |
ca735b3a | 779 | return nf_log_bind_pf(pf, &nfulnl_logger); |
b7047a1c | 780 | case NFULNL_CFG_CMD_PF_UNBIND: |
ca735b3a | 781 | nf_log_unbind_pf(pf); |
b7047a1c PM |
782 | return 0; |
783 | } | |
784 | } | |
785 | ||
0597f268 | 786 | inst = instance_lookup_get(group_num); |
15e47304 | 787 | if (inst && inst->peer_portid != NETLINK_CB(skb).portid) { |
c0506365 PM |
788 | ret = -EPERM; |
789 | goto out_put; | |
790 | } | |
791 | ||
b7047a1c | 792 | if (cmd != NULL) { |
0597f268 HW |
793 | switch (cmd->command) { |
794 | case NFULNL_CFG_CMD_BIND: | |
795 | if (inst) { | |
796 | ret = -EBUSY; | |
797 | goto out_put; | |
798 | } | |
799 | ||
800 | inst = instance_create(group_num, | |
15e47304 | 801 | NETLINK_CB(skb).portid, |
9eea9515 | 802 | sk_user_ns(NETLINK_CB(skb).ssk)); |
baab2ce7 PM |
803 | if (IS_ERR(inst)) { |
804 | ret = PTR_ERR(inst); | |
f414c16c | 805 | goto out; |
0597f268 HW |
806 | } |
807 | break; | |
808 | case NFULNL_CFG_CMD_UNBIND: | |
809 | if (!inst) { | |
810 | ret = -ENODEV; | |
f414c16c | 811 | goto out; |
0597f268 HW |
812 | } |
813 | ||
0597f268 | 814 | instance_destroy(inst); |
a49c6503 | 815 | goto out_put; |
0597f268 | 816 | default: |
cd21f0ac | 817 | ret = -ENOTSUPP; |
0597f268 HW |
818 | break; |
819 | } | |
0597f268 HW |
820 | } |
821 | ||
df6fb868 | 822 | if (nfula[NFULA_CFG_MODE]) { |
0597f268 | 823 | struct nfulnl_msg_config_mode *params; |
df6fb868 | 824 | params = nla_data(nfula[NFULA_CFG_MODE]); |
0597f268 | 825 | |
c0506365 PM |
826 | if (!inst) { |
827 | ret = -ENODEV; | |
828 | goto out; | |
829 | } | |
0597f268 | 830 | nfulnl_set_mode(inst, params->copy_mode, |
d1208b99 | 831 | ntohl(params->copy_range)); |
0597f268 HW |
832 | } |
833 | ||
df6fb868 | 834 | if (nfula[NFULA_CFG_TIMEOUT]) { |
0dfedd28 | 835 | __be32 timeout = nla_get_be32(nfula[NFULA_CFG_TIMEOUT]); |
0597f268 | 836 | |
c0506365 PM |
837 | if (!inst) { |
838 | ret = -ENODEV; | |
839 | goto out; | |
840 | } | |
0597f268 HW |
841 | nfulnl_set_timeout(inst, ntohl(timeout)); |
842 | } | |
843 | ||
df6fb868 | 844 | if (nfula[NFULA_CFG_NLBUFSIZ]) { |
0dfedd28 | 845 | __be32 nlbufsiz = nla_get_be32(nfula[NFULA_CFG_NLBUFSIZ]); |
0597f268 | 846 | |
c0506365 PM |
847 | if (!inst) { |
848 | ret = -ENODEV; | |
849 | goto out; | |
850 | } | |
0597f268 HW |
851 | nfulnl_set_nlbufsiz(inst, ntohl(nlbufsiz)); |
852 | } | |
853 | ||
df6fb868 | 854 | if (nfula[NFULA_CFG_QTHRESH]) { |
0dfedd28 | 855 | __be32 qthresh = nla_get_be32(nfula[NFULA_CFG_QTHRESH]); |
0597f268 | 856 | |
c0506365 PM |
857 | if (!inst) { |
858 | ret = -ENODEV; | |
859 | goto out; | |
860 | } | |
0597f268 HW |
861 | nfulnl_set_qthresh(inst, ntohl(qthresh)); |
862 | } | |
863 | ||
df6fb868 | 864 | if (nfula[NFULA_CFG_FLAGS]) { |
0dfedd28 | 865 | __be16 flags = nla_get_be16(nfula[NFULA_CFG_FLAGS]); |
c0506365 PM |
866 | |
867 | if (!inst) { | |
868 | ret = -ENODEV; | |
869 | goto out; | |
870 | } | |
ee433530 | 871 | nfulnl_set_flags(inst, ntohs(flags)); |
0af5f6c1 HW |
872 | } |
873 | ||
0597f268 HW |
874 | out_put: |
875 | instance_put(inst); | |
dd16704e | 876 | out: |
0597f268 HW |
877 | return ret; |
878 | } | |
879 | ||
7c8d4cb4 | 880 | static const struct nfnl_callback nfulnl_cb[NFULNL_MSG_MAX] = { |
0597f268 | 881 | [NFULNL_MSG_PACKET] = { .call = nfulnl_recv_unsupp, |
37d2e7a2 | 882 | .attr_count = NFULA_MAX, }, |
0597f268 | 883 | [NFULNL_MSG_CONFIG] = { .call = nfulnl_recv_config, |
fd8281ad PM |
884 | .attr_count = NFULA_CFG_MAX, |
885 | .policy = nfula_cfg_policy }, | |
0597f268 HW |
886 | }; |
887 | ||
7c8d4cb4 | 888 | static const struct nfnetlink_subsystem nfulnl_subsys = { |
0597f268 HW |
889 | .name = "log", |
890 | .subsys_id = NFNL_SUBSYS_ULOG, | |
891 | .cb_count = NFULNL_MSG_MAX, | |
0597f268 HW |
892 | .cb = nfulnl_cb, |
893 | }; | |
894 | ||
895 | #ifdef CONFIG_PROC_FS | |
896 | struct iter_state { | |
897 | unsigned int bucket; | |
898 | }; | |
899 | ||
f76cdcee | 900 | static struct hlist_node *get_first(struct iter_state *st) |
0597f268 | 901 | { |
0597f268 HW |
902 | if (!st) |
903 | return NULL; | |
904 | ||
905 | for (st->bucket = 0; st->bucket < INSTANCE_BUCKETS; st->bucket++) { | |
906 | if (!hlist_empty(&instance_table[st->bucket])) | |
0e60ebe0 | 907 | return rcu_dereference_bh(hlist_first_rcu(&instance_table[st->bucket])); |
0597f268 HW |
908 | } |
909 | return NULL; | |
910 | } | |
911 | ||
f76cdcee | 912 | static struct hlist_node *get_next(struct iter_state *st, struct hlist_node *h) |
0597f268 | 913 | { |
0e60ebe0 | 914 | h = rcu_dereference_bh(hlist_next_rcu(h)); |
0597f268 HW |
915 | while (!h) { |
916 | if (++st->bucket >= INSTANCE_BUCKETS) | |
917 | return NULL; | |
918 | ||
0e60ebe0 | 919 | h = rcu_dereference_bh(hlist_first_rcu(&instance_table[st->bucket])); |
0597f268 HW |
920 | } |
921 | return h; | |
922 | } | |
923 | ||
f76cdcee | 924 | static struct hlist_node *get_idx(struct iter_state *st, loff_t pos) |
0597f268 HW |
925 | { |
926 | struct hlist_node *head; | |
f76cdcee | 927 | head = get_first(st); |
0597f268 HW |
928 | |
929 | if (head) | |
f76cdcee | 930 | while (pos && (head = get_next(st, head))) |
0597f268 HW |
931 | pos--; |
932 | return pos ? NULL : head; | |
933 | } | |
934 | ||
935 | static void *seq_start(struct seq_file *seq, loff_t *pos) | |
bed1be20 | 936 | __acquires(rcu_bh) |
0597f268 | 937 | { |
bed1be20 | 938 | rcu_read_lock_bh(); |
f76cdcee | 939 | return get_idx(seq->private, *pos); |
0597f268 HW |
940 | } |
941 | ||
942 | static void *seq_next(struct seq_file *s, void *v, loff_t *pos) | |
943 | { | |
944 | (*pos)++; | |
f76cdcee | 945 | return get_next(s->private, v); |
0597f268 HW |
946 | } |
947 | ||
948 | static void seq_stop(struct seq_file *s, void *v) | |
bed1be20 | 949 | __releases(rcu_bh) |
0597f268 | 950 | { |
bed1be20 | 951 | rcu_read_unlock_bh(); |
0597f268 HW |
952 | } |
953 | ||
954 | static int seq_show(struct seq_file *s, void *v) | |
955 | { | |
956 | const struct nfulnl_instance *inst = v; | |
957 | ||
601e68e1 | 958 | return seq_printf(s, "%5d %6d %5d %1d %5d %6d %2d\n", |
0597f268 | 959 | inst->group_num, |
15e47304 | 960 | inst->peer_portid, inst->qlen, |
0597f268 HW |
961 | inst->copy_mode, inst->copy_range, |
962 | inst->flushtimeout, atomic_read(&inst->use)); | |
963 | } | |
964 | ||
56b3d975 | 965 | static const struct seq_operations nful_seq_ops = { |
0597f268 HW |
966 | .start = seq_start, |
967 | .next = seq_next, | |
968 | .stop = seq_stop, | |
969 | .show = seq_show, | |
970 | }; | |
971 | ||
972 | static int nful_open(struct inode *inode, struct file *file) | |
973 | { | |
e2da5913 PE |
974 | return seq_open_private(file, &nful_seq_ops, |
975 | sizeof(struct iter_state)); | |
0597f268 HW |
976 | } |
977 | ||
da7071d7 | 978 | static const struct file_operations nful_file_ops = { |
0597f268 HW |
979 | .owner = THIS_MODULE, |
980 | .open = nful_open, | |
981 | .read = seq_read, | |
982 | .llseek = seq_lseek, | |
983 | .release = seq_release_private, | |
984 | }; | |
985 | ||
986 | #endif /* PROC_FS */ | |
987 | ||
32292a7f | 988 | static int __init nfnetlink_log_init(void) |
0597f268 HW |
989 | { |
990 | int i, status = -ENOMEM; | |
601e68e1 | 991 | |
0597f268 HW |
992 | for (i = 0; i < INSTANCE_BUCKETS; i++) |
993 | INIT_HLIST_HEAD(&instance_table[i]); | |
601e68e1 | 994 | |
0597f268 HW |
995 | /* it's not really all that important to have a random value, so |
996 | * we can do this from the init function, even if there hasn't | |
997 | * been that much entropy yet */ | |
998 | get_random_bytes(&hash_init, sizeof(hash_init)); | |
999 | ||
1000 | netlink_register_notifier(&nfulnl_rtnl_notifier); | |
1001 | status = nfnetlink_subsys_register(&nfulnl_subsys); | |
1002 | if (status < 0) { | |
1003 | printk(KERN_ERR "log: failed to create netlink socket\n"); | |
1004 | goto cleanup_netlink_notifier; | |
1005 | } | |
1006 | ||
ca735b3a EL |
1007 | status = nf_log_register(NFPROTO_UNSPEC, &nfulnl_logger); |
1008 | if (status < 0) { | |
1009 | printk(KERN_ERR "log: failed to register logger\n"); | |
1010 | goto cleanup_subsys; | |
1011 | } | |
1012 | ||
0597f268 | 1013 | #ifdef CONFIG_PROC_FS |
8eeee8b1 | 1014 | if (!proc_create("nfnetlink_log", 0440, |
6fc09f10 JL |
1015 | proc_net_netfilter, &nful_file_ops)) { |
1016 | status = -ENOMEM; | |
ca735b3a | 1017 | goto cleanup_logger; |
6fc09f10 | 1018 | } |
0597f268 | 1019 | #endif |
0597f268 HW |
1020 | return status; |
1021 | ||
0597f268 | 1022 | #ifdef CONFIG_PROC_FS |
ca735b3a EL |
1023 | cleanup_logger: |
1024 | nf_log_unregister(&nfulnl_logger); | |
1025 | #endif | |
0597f268 | 1026 | cleanup_subsys: |
0597f268 HW |
1027 | nfnetlink_subsys_unregister(&nfulnl_subsys); |
1028 | cleanup_netlink_notifier: | |
1029 | netlink_unregister_notifier(&nfulnl_rtnl_notifier); | |
1030 | return status; | |
1031 | } | |
1032 | ||
65b4b4e8 | 1033 | static void __exit nfnetlink_log_fini(void) |
0597f268 | 1034 | { |
e92ad99c | 1035 | nf_log_unregister(&nfulnl_logger); |
32292a7f PM |
1036 | #ifdef CONFIG_PROC_FS |
1037 | remove_proc_entry("nfnetlink_log", proc_net_netfilter); | |
1038 | #endif | |
1039 | nfnetlink_subsys_unregister(&nfulnl_subsys); | |
1040 | netlink_unregister_notifier(&nfulnl_rtnl_notifier); | |
0597f268 HW |
1041 | } |
1042 | ||
1043 | MODULE_DESCRIPTION("netfilter userspace logging"); | |
1044 | MODULE_AUTHOR("Harald Welte <laforge@netfilter.org>"); | |
1045 | MODULE_LICENSE("GPL"); | |
f682faef | 1046 | MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_ULOG); |
0597f268 | 1047 | |
65b4b4e8 AM |
1048 | module_init(nfnetlink_log_init); |
1049 | module_exit(nfnetlink_log_fini); |