]>
Commit | Line | Data |
---|---|---|
0597f268 HW |
1 | /* |
2 | * This is a module which is used for logging packets to userspace via | |
3 | * nfetlink. | |
4 | * | |
5 | * (C) 2005 by Harald Welte <laforge@netfilter.org> | |
6 | * | |
7 | * Based on the old ipv4-only ipt_ULOG.c: | |
8 | * (C) 2000-2004 by Harald Welte <laforge@netfilter.org> | |
9 | * | |
10 | * This program is free software; you can redistribute it and/or modify | |
11 | * it under the terms of the GNU General Public License version 2 as | |
12 | * published by the Free Software Foundation. | |
0597f268 HW |
13 | */ |
14 | #include <linux/module.h> | |
15 | #include <linux/skbuff.h> | |
16 | #include <linux/init.h> | |
17 | #include <linux/ip.h> | |
18 | #include <linux/ipv6.h> | |
19 | #include <linux/netdevice.h> | |
20 | #include <linux/netfilter.h> | |
21 | #include <linux/netlink.h> | |
22 | #include <linux/netfilter/nfnetlink.h> | |
23 | #include <linux/netfilter/nfnetlink_log.h> | |
24 | #include <linux/spinlock.h> | |
25 | #include <linux/sysctl.h> | |
26 | #include <linux/proc_fs.h> | |
27 | #include <linux/security.h> | |
28 | #include <linux/list.h> | |
29 | #include <linux/jhash.h> | |
30 | #include <linux/random.h> | |
31 | #include <net/sock.h> | |
f01ffbd6 | 32 | #include <net/netfilter/nf_log.h> |
d9e15007 | 33 | #include <net/netfilter/nfnetlink_log.h> |
0597f268 HW |
34 | |
35 | #include <asm/atomic.h> | |
36 | ||
fbcd923c HW |
37 | #ifdef CONFIG_BRIDGE_NETFILTER |
38 | #include "../bridge/br_private.h" | |
39 | #endif | |
40 | ||
c2db2924 | 41 | #define NFULNL_NLBUFSIZ_DEFAULT NLMSG_GOODSIZE |
6b6ec99a | 42 | #define NFULNL_TIMEOUT_DEFAULT HZ /* every second */ |
0597f268 | 43 | #define NFULNL_QTHRESH_DEFAULT 100 /* 100 packets */ |
6b6ec99a | 44 | #define NFULNL_COPY_RANGE_MAX 0xFFFF /* max packet size is limited by 16-bit struct nfattr nfa_len field */ |
0597f268 HW |
45 | |
46 | #define PRINTR(x, args...) do { if (net_ratelimit()) \ | |
47 | printk(x, ## args); } while (0); | |
48 | ||
0597f268 HW |
49 | struct nfulnl_instance { |
50 | struct hlist_node hlist; /* global list of instances */ | |
51 | spinlock_t lock; | |
52 | atomic_t use; /* use count */ | |
53 | ||
54 | unsigned int qlen; /* number of nlmsgs in skb */ | |
55 | struct sk_buff *skb; /* pre-allocatd skb */ | |
0597f268 HW |
56 | struct timer_list timer; |
57 | int peer_pid; /* PID of the peer process */ | |
58 | ||
59 | /* configurable parameters */ | |
60 | unsigned int flushtimeout; /* timeout until queue flush */ | |
61 | unsigned int nlbufsiz; /* netlink buffer allocation size */ | |
62 | unsigned int qthreshold; /* threshold of the queue */ | |
63 | u_int32_t copy_range; | |
0af5f6c1 | 64 | u_int32_t seq; /* instance-local sequential counter */ |
0597f268 | 65 | u_int16_t group_num; /* number of this queue */ |
0af5f6c1 | 66 | u_int16_t flags; |
601e68e1 | 67 | u_int8_t copy_mode; |
0597f268 HW |
68 | }; |
69 | ||
70 | static DEFINE_RWLOCK(instances_lock); | |
0af5f6c1 | 71 | static atomic_t global_seq; |
0597f268 HW |
72 | |
73 | #define INSTANCE_BUCKETS 16 | |
74 | static struct hlist_head instance_table[INSTANCE_BUCKETS]; | |
75 | static unsigned int hash_init; | |
76 | ||
77 | static inline u_int8_t instance_hashfn(u_int16_t group_num) | |
78 | { | |
79 | return ((group_num & 0xff) % INSTANCE_BUCKETS); | |
80 | } | |
81 | ||
82 | static struct nfulnl_instance * | |
83 | __instance_lookup(u_int16_t group_num) | |
84 | { | |
85 | struct hlist_head *head; | |
86 | struct hlist_node *pos; | |
87 | struct nfulnl_instance *inst; | |
88 | ||
0597f268 HW |
89 | head = &instance_table[instance_hashfn(group_num)]; |
90 | hlist_for_each_entry(inst, pos, head, hlist) { | |
91 | if (inst->group_num == group_num) | |
92 | return inst; | |
93 | } | |
94 | return NULL; | |
95 | } | |
96 | ||
97 | static inline void | |
98 | instance_get(struct nfulnl_instance *inst) | |
99 | { | |
100 | atomic_inc(&inst->use); | |
101 | } | |
102 | ||
103 | static struct nfulnl_instance * | |
104 | instance_lookup_get(u_int16_t group_num) | |
105 | { | |
106 | struct nfulnl_instance *inst; | |
107 | ||
108 | read_lock_bh(&instances_lock); | |
109 | inst = __instance_lookup(group_num); | |
110 | if (inst) | |
111 | instance_get(inst); | |
112 | read_unlock_bh(&instances_lock); | |
113 | ||
114 | return inst; | |
115 | } | |
116 | ||
117 | static void | |
118 | instance_put(struct nfulnl_instance *inst) | |
119 | { | |
120 | if (inst && atomic_dec_and_test(&inst->use)) { | |
0597f268 | 121 | kfree(inst); |
7d90e86d | 122 | module_put(THIS_MODULE); |
0597f268 HW |
123 | } |
124 | } | |
125 | ||
126 | static void nfulnl_timer(unsigned long data); | |
127 | ||
128 | static struct nfulnl_instance * | |
129 | instance_create(u_int16_t group_num, int pid) | |
130 | { | |
131 | struct nfulnl_instance *inst; | |
baab2ce7 | 132 | int err; |
0597f268 | 133 | |
601e68e1 | 134 | write_lock_bh(&instances_lock); |
0597f268 | 135 | if (__instance_lookup(group_num)) { |
baab2ce7 | 136 | err = -EEXIST; |
0597f268 HW |
137 | goto out_unlock; |
138 | } | |
139 | ||
10dfdc69 | 140 | inst = kzalloc(sizeof(*inst), GFP_ATOMIC); |
baab2ce7 PM |
141 | if (!inst) { |
142 | err = -ENOMEM; | |
0597f268 | 143 | goto out_unlock; |
baab2ce7 | 144 | } |
0597f268 | 145 | |
aace57e0 MM |
146 | if (!try_module_get(THIS_MODULE)) { |
147 | kfree(inst); | |
baab2ce7 | 148 | err = -EAGAIN; |
aace57e0 MM |
149 | goto out_unlock; |
150 | } | |
151 | ||
0597f268 | 152 | INIT_HLIST_NODE(&inst->hlist); |
181a46a5 | 153 | spin_lock_init(&inst->lock); |
0597f268 HW |
154 | /* needs to be two, since we _put() after creation */ |
155 | atomic_set(&inst->use, 2); | |
156 | ||
e6f689db | 157 | setup_timer(&inst->timer, nfulnl_timer, (unsigned long)inst); |
0597f268 HW |
158 | |
159 | inst->peer_pid = pid; | |
160 | inst->group_num = group_num; | |
161 | ||
162 | inst->qthreshold = NFULNL_QTHRESH_DEFAULT; | |
163 | inst->flushtimeout = NFULNL_TIMEOUT_DEFAULT; | |
164 | inst->nlbufsiz = NFULNL_NLBUFSIZ_DEFAULT; | |
165 | inst->copy_mode = NFULNL_COPY_PACKET; | |
6b6ec99a | 166 | inst->copy_range = NFULNL_COPY_RANGE_MAX; |
0597f268 | 167 | |
601e68e1 | 168 | hlist_add_head(&inst->hlist, |
0597f268 HW |
169 | &instance_table[instance_hashfn(group_num)]); |
170 | ||
0597f268 HW |
171 | write_unlock_bh(&instances_lock); |
172 | ||
173 | return inst; | |
174 | ||
0597f268 HW |
175 | out_unlock: |
176 | write_unlock_bh(&instances_lock); | |
baab2ce7 | 177 | return ERR_PTR(err); |
0597f268 HW |
178 | } |
179 | ||
e3567061 | 180 | static void __nfulnl_flush(struct nfulnl_instance *inst); |
0597f268 HW |
181 | |
182 | static void | |
9afdb00c | 183 | __instance_destroy(struct nfulnl_instance *inst) |
0597f268 HW |
184 | { |
185 | /* first pull it out of the global list */ | |
0597f268 HW |
186 | hlist_del(&inst->hlist); |
187 | ||
0597f268 HW |
188 | /* then flush all pending packets from skb */ |
189 | ||
190 | spin_lock_bh(&inst->lock); | |
e3567061 MM |
191 | if (inst->skb) |
192 | __nfulnl_flush(inst); | |
0597f268 HW |
193 | spin_unlock_bh(&inst->lock); |
194 | ||
195 | /* and finally put the refcount */ | |
196 | instance_put(inst); | |
0597f268 HW |
197 | } |
198 | ||
0597f268 HW |
199 | static inline void |
200 | instance_destroy(struct nfulnl_instance *inst) | |
201 | { | |
9afdb00c PM |
202 | write_lock_bh(&instances_lock); |
203 | __instance_destroy(inst); | |
204 | write_unlock_bh(&instances_lock); | |
0597f268 HW |
205 | } |
206 | ||
207 | static int | |
208 | nfulnl_set_mode(struct nfulnl_instance *inst, u_int8_t mode, | |
209 | unsigned int range) | |
210 | { | |
211 | int status = 0; | |
212 | ||
213 | spin_lock_bh(&inst->lock); | |
601e68e1 | 214 | |
0597f268 HW |
215 | switch (mode) { |
216 | case NFULNL_COPY_NONE: | |
217 | case NFULNL_COPY_META: | |
218 | inst->copy_mode = mode; | |
219 | inst->copy_range = 0; | |
220 | break; | |
601e68e1 | 221 | |
0597f268 HW |
222 | case NFULNL_COPY_PACKET: |
223 | inst->copy_mode = mode; | |
6b6ec99a MM |
224 | inst->copy_range = min_t(unsigned int, |
225 | range, NFULNL_COPY_RANGE_MAX); | |
0597f268 | 226 | break; |
601e68e1 | 227 | |
0597f268 HW |
228 | default: |
229 | status = -EINVAL; | |
230 | break; | |
231 | } | |
232 | ||
233 | spin_unlock_bh(&inst->lock); | |
234 | ||
235 | return status; | |
236 | } | |
237 | ||
238 | static int | |
239 | nfulnl_set_nlbufsiz(struct nfulnl_instance *inst, u_int32_t nlbufsiz) | |
240 | { | |
241 | int status; | |
242 | ||
243 | spin_lock_bh(&inst->lock); | |
244 | if (nlbufsiz < NFULNL_NLBUFSIZ_DEFAULT) | |
245 | status = -ERANGE; | |
246 | else if (nlbufsiz > 131072) | |
247 | status = -ERANGE; | |
248 | else { | |
249 | inst->nlbufsiz = nlbufsiz; | |
250 | status = 0; | |
251 | } | |
252 | spin_unlock_bh(&inst->lock); | |
253 | ||
254 | return status; | |
255 | } | |
256 | ||
257 | static int | |
258 | nfulnl_set_timeout(struct nfulnl_instance *inst, u_int32_t timeout) | |
259 | { | |
260 | spin_lock_bh(&inst->lock); | |
261 | inst->flushtimeout = timeout; | |
262 | spin_unlock_bh(&inst->lock); | |
263 | ||
264 | return 0; | |
265 | } | |
266 | ||
267 | static int | |
268 | nfulnl_set_qthresh(struct nfulnl_instance *inst, u_int32_t qthresh) | |
269 | { | |
270 | spin_lock_bh(&inst->lock); | |
271 | inst->qthreshold = qthresh; | |
272 | spin_unlock_bh(&inst->lock); | |
273 | ||
274 | return 0; | |
275 | } | |
276 | ||
0af5f6c1 HW |
277 | static int |
278 | nfulnl_set_flags(struct nfulnl_instance *inst, u_int16_t flags) | |
279 | { | |
280 | spin_lock_bh(&inst->lock); | |
ee433530 | 281 | inst->flags = flags; |
0af5f6c1 HW |
282 | spin_unlock_bh(&inst->lock); |
283 | ||
284 | return 0; | |
285 | } | |
286 | ||
c6a8f648 MM |
287 | static struct sk_buff * |
288 | nfulnl_alloc_skb(unsigned int inst_size, unsigned int pkt_size) | |
0597f268 HW |
289 | { |
290 | struct sk_buff *skb; | |
ad2ad0f9 | 291 | unsigned int n; |
0597f268 | 292 | |
0597f268 HW |
293 | /* alloc skb which should be big enough for a whole multipart |
294 | * message. WARNING: has to be <= 128k due to slab restrictions */ | |
295 | ||
ad2ad0f9 PM |
296 | n = max(inst_size, pkt_size); |
297 | skb = alloc_skb(n, GFP_ATOMIC); | |
0597f268 HW |
298 | if (!skb) { |
299 | PRINTR("nfnetlink_log: can't alloc whole buffer (%u bytes)\n", | |
300 | inst_size); | |
301 | ||
ad2ad0f9 PM |
302 | if (n > pkt_size) { |
303 | /* try to allocate only as much as we need for current | |
304 | * packet */ | |
0597f268 | 305 | |
ad2ad0f9 PM |
306 | skb = alloc_skb(pkt_size, GFP_ATOMIC); |
307 | if (!skb) | |
308 | PRINTR("nfnetlink_log: can't even alloc %u " | |
309 | "bytes\n", pkt_size); | |
310 | } | |
0597f268 HW |
311 | } |
312 | ||
313 | return skb; | |
314 | } | |
315 | ||
316 | static int | |
317 | __nfulnl_send(struct nfulnl_instance *inst) | |
318 | { | |
29c5d4af | 319 | int status = -1; |
0597f268 | 320 | |
0597f268 | 321 | if (inst->qlen > 1) |
29c5d4af EL |
322 | NLMSG_PUT(inst->skb, 0, 0, |
323 | NLMSG_DONE, | |
324 | sizeof(struct nfgenmsg)); | |
0597f268 HW |
325 | |
326 | status = nfnetlink_unicast(inst->skb, inst->peer_pid, MSG_DONTWAIT); | |
0597f268 HW |
327 | |
328 | inst->qlen = 0; | |
329 | inst->skb = NULL; | |
0597f268 | 330 | |
29c5d4af | 331 | nlmsg_failure: |
0597f268 HW |
332 | return status; |
333 | } | |
334 | ||
e3567061 MM |
335 | static void |
336 | __nfulnl_flush(struct nfulnl_instance *inst) | |
337 | { | |
338 | /* timer holds a reference */ | |
339 | if (del_timer(&inst->timer)) | |
340 | instance_put(inst); | |
341 | if (inst->skb) | |
342 | __nfulnl_send(inst); | |
343 | } | |
344 | ||
c6a8f648 MM |
345 | static void |
346 | nfulnl_timer(unsigned long data) | |
0597f268 | 347 | { |
601e68e1 | 348 | struct nfulnl_instance *inst = (struct nfulnl_instance *)data; |
0597f268 | 349 | |
0597f268 | 350 | spin_lock_bh(&inst->lock); |
370e6a87 MM |
351 | if (inst->skb) |
352 | __nfulnl_send(inst); | |
0597f268 | 353 | spin_unlock_bh(&inst->lock); |
05f7b7b3 | 354 | instance_put(inst); |
0597f268 HW |
355 | } |
356 | ||
0af5f6c1 HW |
357 | /* This is an inline function, we don't really care about a long |
358 | * list of arguments */ | |
601e68e1 | 359 | static inline int |
0597f268 | 360 | __build_packet_message(struct nfulnl_instance *inst, |
601e68e1 | 361 | const struct sk_buff *skb, |
0597f268 | 362 | unsigned int data_len, |
76108cea | 363 | u_int8_t pf, |
0597f268 HW |
364 | unsigned int hooknum, |
365 | const struct net_device *indev, | |
366 | const struct net_device *outdev, | |
367 | const struct nf_loginfo *li, | |
d7a5c324 | 368 | const char *prefix, unsigned int plen) |
0597f268 | 369 | { |
0597f268 HW |
370 | struct nfulnl_msg_packet_hdr pmsg; |
371 | struct nlmsghdr *nlh; | |
372 | struct nfgenmsg *nfmsg; | |
98a4a861 | 373 | __be32 tmp_uint; |
27a884dc | 374 | sk_buff_data_t old_tail = inst->skb->tail; |
0597f268 | 375 | |
601e68e1 | 376 | nlh = NLMSG_PUT(inst->skb, 0, 0, |
0597f268 HW |
377 | NFNL_SUBSYS_ULOG << 8 | NFULNL_MSG_PACKET, |
378 | sizeof(struct nfgenmsg)); | |
379 | nfmsg = NLMSG_DATA(nlh); | |
380 | nfmsg->nfgen_family = pf; | |
381 | nfmsg->version = NFNETLINK_V0; | |
382 | nfmsg->res_id = htons(inst->group_num); | |
383 | ||
febf0a43 | 384 | pmsg.hw_protocol = skb->protocol; |
0597f268 HW |
385 | pmsg.hook = hooknum; |
386 | ||
df6fb868 | 387 | NLA_PUT(inst->skb, NFULA_PACKET_HDR, sizeof(pmsg), &pmsg); |
0597f268 | 388 | |
d7a5c324 | 389 | if (prefix) |
df6fb868 | 390 | NLA_PUT(inst->skb, NFULA_PREFIX, plen, prefix); |
0597f268 HW |
391 | |
392 | if (indev) { | |
fbcd923c | 393 | #ifndef CONFIG_BRIDGE_NETFILTER |
0dfedd28 PM |
394 | NLA_PUT_BE32(inst->skb, NFULA_IFINDEX_INDEV, |
395 | htonl(indev->ifindex)); | |
fbcd923c HW |
396 | #else |
397 | if (pf == PF_BRIDGE) { | |
398 | /* Case 1: outdev is physical input device, we need to | |
399 | * look for bridge group (when called from | |
400 | * netfilter_bridge) */ | |
0dfedd28 PM |
401 | NLA_PUT_BE32(inst->skb, NFULA_IFINDEX_PHYSINDEV, |
402 | htonl(indev->ifindex)); | |
fbcd923c | 403 | /* this is the bridge group "brX" */ |
0dfedd28 PM |
404 | NLA_PUT_BE32(inst->skb, NFULA_IFINDEX_INDEV, |
405 | htonl(indev->br_port->br->dev->ifindex)); | |
fbcd923c HW |
406 | } else { |
407 | /* Case 2: indev is bridge group, we need to look for | |
408 | * physical device (when called from ipv4) */ | |
0dfedd28 PM |
409 | NLA_PUT_BE32(inst->skb, NFULA_IFINDEX_INDEV, |
410 | htonl(indev->ifindex)); | |
411 | if (skb->nf_bridge && skb->nf_bridge->physindev) | |
412 | NLA_PUT_BE32(inst->skb, NFULA_IFINDEX_PHYSINDEV, | |
413 | htonl(skb->nf_bridge->physindev->ifindex)); | |
fbcd923c HW |
414 | } |
415 | #endif | |
0597f268 HW |
416 | } |
417 | ||
418 | if (outdev) { | |
419 | tmp_uint = htonl(outdev->ifindex); | |
fbcd923c | 420 | #ifndef CONFIG_BRIDGE_NETFILTER |
0dfedd28 PM |
421 | NLA_PUT_BE32(inst->skb, NFULA_IFINDEX_OUTDEV, |
422 | htonl(outdev->ifindex)); | |
fbcd923c HW |
423 | #else |
424 | if (pf == PF_BRIDGE) { | |
425 | /* Case 1: outdev is physical output device, we need to | |
426 | * look for bridge group (when called from | |
427 | * netfilter_bridge) */ | |
0dfedd28 PM |
428 | NLA_PUT_BE32(inst->skb, NFULA_IFINDEX_PHYSOUTDEV, |
429 | htonl(outdev->ifindex)); | |
fbcd923c | 430 | /* this is the bridge group "brX" */ |
0dfedd28 PM |
431 | NLA_PUT_BE32(inst->skb, NFULA_IFINDEX_OUTDEV, |
432 | htonl(outdev->br_port->br->dev->ifindex)); | |
fbcd923c HW |
433 | } else { |
434 | /* Case 2: indev is a bridge group, we need to look | |
435 | * for physical device (when called from ipv4) */ | |
0dfedd28 PM |
436 | NLA_PUT_BE32(inst->skb, NFULA_IFINDEX_OUTDEV, |
437 | htonl(outdev->ifindex)); | |
438 | if (skb->nf_bridge && skb->nf_bridge->physoutdev) | |
439 | NLA_PUT_BE32(inst->skb, NFULA_IFINDEX_PHYSOUTDEV, | |
440 | htonl(skb->nf_bridge->physoutdev->ifindex)); | |
fbcd923c HW |
441 | } |
442 | #endif | |
0597f268 HW |
443 | } |
444 | ||
0dfedd28 PM |
445 | if (skb->mark) |
446 | NLA_PUT_BE32(inst->skb, NFULA_MARK, htonl(skb->mark)); | |
0597f268 | 447 | |
b95cce35 | 448 | if (indev && skb->dev) { |
0597f268 | 449 | struct nfulnl_msg_packet_hw phw; |
b95cce35 SH |
450 | int len = dev_parse_header(skb, phw.hw_addr); |
451 | if (len > 0) { | |
452 | phw.hw_addrlen = htons(len); | |
df6fb868 | 453 | NLA_PUT(inst->skb, NFULA_HWADDR, sizeof(phw), &phw); |
b95cce35 | 454 | } |
0597f268 HW |
455 | } |
456 | ||
72961ecf EL |
457 | if (indev && skb_mac_header_was_set(skb)) { |
458 | NLA_PUT_BE16(inst->skb, NFULA_HWTYPE, htons(skb->dev->type)); | |
459 | NLA_PUT_BE16(inst->skb, NFULA_HWLEN, | |
460 | htons(skb->dev->hard_header_len)); | |
461 | NLA_PUT(inst->skb, NFULA_HWHEADER, skb->dev->hard_header_len, | |
462 | skb_mac_header(skb)); | |
463 | } | |
464 | ||
b7aa0bf7 | 465 | if (skb->tstamp.tv64) { |
0597f268 | 466 | struct nfulnl_msg_packet_timestamp ts; |
b7aa0bf7 ED |
467 | struct timeval tv = ktime_to_timeval(skb->tstamp); |
468 | ts.sec = cpu_to_be64(tv.tv_sec); | |
469 | ts.usec = cpu_to_be64(tv.tv_usec); | |
0597f268 | 470 | |
df6fb868 | 471 | NLA_PUT(inst->skb, NFULA_TIMESTAMP, sizeof(ts), &ts); |
0597f268 HW |
472 | } |
473 | ||
474 | /* UID */ | |
475 | if (skb->sk) { | |
476 | read_lock_bh(&skb->sk->sk_callback_lock); | |
477 | if (skb->sk->sk_socket && skb->sk->sk_socket->file) { | |
d76b0d9b DH |
478 | struct file *file = skb->sk->sk_socket->file; |
479 | __be32 uid = htonl(file->f_cred->fsuid); | |
480 | __be32 gid = htonl(file->f_cred->fsgid); | |
df6fb868 | 481 | /* need to unlock here since NLA_PUT may goto */ |
0597f268 | 482 | read_unlock_bh(&skb->sk->sk_callback_lock); |
0dfedd28 | 483 | NLA_PUT_BE32(inst->skb, NFULA_UID, uid); |
76aa1ce1 | 484 | NLA_PUT_BE32(inst->skb, NFULA_GID, gid); |
0597f268 HW |
485 | } else |
486 | read_unlock_bh(&skb->sk->sk_callback_lock); | |
487 | } | |
488 | ||
0af5f6c1 | 489 | /* local sequence number */ |
0dfedd28 PM |
490 | if (inst->flags & NFULNL_CFG_F_SEQ) |
491 | NLA_PUT_BE32(inst->skb, NFULA_SEQ, htonl(inst->seq++)); | |
492 | ||
0af5f6c1 | 493 | /* global sequence number */ |
0dfedd28 PM |
494 | if (inst->flags & NFULNL_CFG_F_SEQ_GLOBAL) |
495 | NLA_PUT_BE32(inst->skb, NFULA_SEQ_GLOBAL, | |
496 | htonl(atomic_inc_return(&global_seq))); | |
0af5f6c1 | 497 | |
0597f268 | 498 | if (data_len) { |
df6fb868 PM |
499 | struct nlattr *nla; |
500 | int size = nla_attr_size(data_len); | |
0597f268 | 501 | |
df6fb868 | 502 | if (skb_tailroom(inst->skb) < nla_total_size(data_len)) { |
0597f268 HW |
503 | printk(KERN_WARNING "nfnetlink_log: no tailroom!\n"); |
504 | goto nlmsg_failure; | |
505 | } | |
506 | ||
df6fb868 PM |
507 | nla = (struct nlattr *)skb_put(inst->skb, nla_total_size(data_len)); |
508 | nla->nla_type = NFULA_PAYLOAD; | |
509 | nla->nla_len = size; | |
0597f268 | 510 | |
df6fb868 | 511 | if (skb_copy_bits(skb, 0, nla_data(nla), data_len)) |
0597f268 HW |
512 | BUG(); |
513 | } | |
601e68e1 | 514 | |
0597f268 HW |
515 | nlh->nlmsg_len = inst->skb->tail - old_tail; |
516 | return 0; | |
517 | ||
518 | nlmsg_failure: | |
df6fb868 | 519 | nla_put_failure: |
0597f268 HW |
520 | PRINTR(KERN_ERR "nfnetlink_log: error creating log nlmsg\n"); |
521 | return -1; | |
522 | } | |
523 | ||
524 | #define RCV_SKB_FAIL(err) do { netlink_ack(skb, nlh, (err)); return; } while (0) | |
525 | ||
526 | static struct nf_loginfo default_loginfo = { | |
527 | .type = NF_LOG_TYPE_ULOG, | |
528 | .u = { | |
529 | .ulog = { | |
530 | .copy_len = 0xffff, | |
531 | .group = 0, | |
532 | .qthreshold = 1, | |
533 | }, | |
534 | }, | |
535 | }; | |
536 | ||
537 | /* log handler for internal netfilter logging api */ | |
5f7340ef | 538 | void |
76108cea | 539 | nfulnl_log_packet(u_int8_t pf, |
0597f268 HW |
540 | unsigned int hooknum, |
541 | const struct sk_buff *skb, | |
542 | const struct net_device *in, | |
543 | const struct net_device *out, | |
544 | const struct nf_loginfo *li_user, | |
545 | const char *prefix) | |
546 | { | |
547 | unsigned int size, data_len; | |
548 | struct nfulnl_instance *inst; | |
549 | const struct nf_loginfo *li; | |
550 | unsigned int qthreshold; | |
d7a5c324 | 551 | unsigned int plen; |
0597f268 | 552 | |
601e68e1 | 553 | if (li_user && li_user->type == NF_LOG_TYPE_ULOG) |
0597f268 HW |
554 | li = li_user; |
555 | else | |
556 | li = &default_loginfo; | |
557 | ||
558 | inst = instance_lookup_get(li->u.ulog.group); | |
559 | if (!inst) | |
0597f268 | 560 | return; |
0597f268 | 561 | |
d7a5c324 PM |
562 | plen = 0; |
563 | if (prefix) | |
881dbfe8 | 564 | plen = strlen(prefix) + 1; |
d7a5c324 | 565 | |
0597f268 HW |
566 | /* FIXME: do we want to make the size calculation conditional based on |
567 | * what is actually present? way more branches and checks, but more | |
568 | * memory efficient... */ | |
7000d38d | 569 | size = NLMSG_SPACE(sizeof(struct nfgenmsg)) |
df6fb868 PM |
570 | + nla_total_size(sizeof(struct nfulnl_msg_packet_hdr)) |
571 | + nla_total_size(sizeof(u_int32_t)) /* ifindex */ | |
572 | + nla_total_size(sizeof(u_int32_t)) /* ifindex */ | |
fbcd923c | 573 | #ifdef CONFIG_BRIDGE_NETFILTER |
df6fb868 PM |
574 | + nla_total_size(sizeof(u_int32_t)) /* ifindex */ |
575 | + nla_total_size(sizeof(u_int32_t)) /* ifindex */ | |
fbcd923c | 576 | #endif |
df6fb868 PM |
577 | + nla_total_size(sizeof(u_int32_t)) /* mark */ |
578 | + nla_total_size(sizeof(u_int32_t)) /* uid */ | |
76aa1ce1 | 579 | + nla_total_size(sizeof(u_int32_t)) /* gid */ |
df6fb868 PM |
580 | + nla_total_size(plen) /* prefix */ |
581 | + nla_total_size(sizeof(struct nfulnl_msg_packet_hw)) | |
582 | + nla_total_size(sizeof(struct nfulnl_msg_packet_timestamp)); | |
0597f268 | 583 | |
0597f268 HW |
584 | spin_lock_bh(&inst->lock); |
585 | ||
0af5f6c1 | 586 | if (inst->flags & NFULNL_CFG_F_SEQ) |
df6fb868 | 587 | size += nla_total_size(sizeof(u_int32_t)); |
0af5f6c1 | 588 | if (inst->flags & NFULNL_CFG_F_SEQ_GLOBAL) |
df6fb868 | 589 | size += nla_total_size(sizeof(u_int32_t)); |
0af5f6c1 | 590 | |
0597f268 HW |
591 | qthreshold = inst->qthreshold; |
592 | /* per-rule qthreshold overrides per-instance */ | |
5ca431f9 EL |
593 | if (li->u.ulog.qthreshold) |
594 | if (qthreshold > li->u.ulog.qthreshold) | |
595 | qthreshold = li->u.ulog.qthreshold; | |
596 | ||
601e68e1 | 597 | |
0597f268 HW |
598 | switch (inst->copy_mode) { |
599 | case NFULNL_COPY_META: | |
600 | case NFULNL_COPY_NONE: | |
601 | data_len = 0; | |
602 | break; | |
601e68e1 | 603 | |
0597f268 | 604 | case NFULNL_COPY_PACKET: |
601e68e1 | 605 | if (inst->copy_range == 0 |
0597f268 HW |
606 | || inst->copy_range > skb->len) |
607 | data_len = skb->len; | |
608 | else | |
609 | data_len = inst->copy_range; | |
601e68e1 | 610 | |
df6fb868 | 611 | size += nla_total_size(data_len); |
0597f268 | 612 | break; |
601e68e1 | 613 | |
0597f268 | 614 | default: |
55b5a91e | 615 | goto unlock_and_release; |
0597f268 HW |
616 | } |
617 | ||
d63b043d MM |
618 | if (inst->skb && |
619 | size > skb_tailroom(inst->skb) - sizeof(struct nfgenmsg)) { | |
0597f268 HW |
620 | /* either the queue len is too high or we don't have |
621 | * enough room in the skb left. flush to userspace. */ | |
e3567061 | 622 | __nfulnl_flush(inst); |
55b5a91e | 623 | } |
0597f268 | 624 | |
55b5a91e MM |
625 | if (!inst->skb) { |
626 | inst->skb = nfulnl_alloc_skb(inst->nlbufsiz, size); | |
627 | if (!inst->skb) | |
0597f268 | 628 | goto alloc_failure; |
0597f268 HW |
629 | } |
630 | ||
0597f268 HW |
631 | inst->qlen++; |
632 | ||
633 | __build_packet_message(inst, skb, data_len, pf, | |
d7a5c324 | 634 | hooknum, in, out, li, prefix, plen); |
0597f268 | 635 | |
d63b043d MM |
636 | if (inst->qlen >= qthreshold) |
637 | __nfulnl_flush(inst); | |
0597f268 HW |
638 | /* timer_pending always called within inst->lock, so there |
639 | * is no chance of a race here */ | |
d63b043d | 640 | else if (!timer_pending(&inst->timer)) { |
0597f268 HW |
641 | instance_get(inst); |
642 | inst->timer.expires = jiffies + (inst->flushtimeout*HZ/100); | |
643 | add_timer(&inst->timer); | |
644 | } | |
0597f268 | 645 | |
ed32abea MM |
646 | unlock_and_release: |
647 | spin_unlock_bh(&inst->lock); | |
648 | instance_put(inst); | |
0597f268 HW |
649 | return; |
650 | ||
651 | alloc_failure: | |
0597f268 | 652 | /* FIXME: statistics */ |
ed32abea | 653 | goto unlock_and_release; |
0597f268 | 654 | } |
5f7340ef | 655 | EXPORT_SYMBOL_GPL(nfulnl_log_packet); |
0597f268 HW |
656 | |
657 | static int | |
658 | nfulnl_rcv_nl_event(struct notifier_block *this, | |
659 | unsigned long event, void *ptr) | |
660 | { | |
661 | struct netlink_notify *n = ptr; | |
662 | ||
663 | if (event == NETLINK_URELEASE && | |
664 | n->protocol == NETLINK_NETFILTER && n->pid) { | |
665 | int i; | |
666 | ||
667 | /* destroy all instances for this pid */ | |
668 | write_lock_bh(&instances_lock); | |
669 | for (i = 0; i < INSTANCE_BUCKETS; i++) { | |
670 | struct hlist_node *tmp, *t2; | |
671 | struct nfulnl_instance *inst; | |
672 | struct hlist_head *head = &instance_table[i]; | |
673 | ||
674 | hlist_for_each_entry_safe(inst, tmp, t2, head, hlist) { | |
b4b51029 EB |
675 | if ((n->net == &init_net) && |
676 | (n->pid == inst->peer_pid)) | |
0597f268 HW |
677 | __instance_destroy(inst); |
678 | } | |
679 | } | |
680 | write_unlock_bh(&instances_lock); | |
681 | } | |
682 | return NOTIFY_DONE; | |
683 | } | |
684 | ||
685 | static struct notifier_block nfulnl_rtnl_notifier = { | |
686 | .notifier_call = nfulnl_rcv_nl_event, | |
687 | }; | |
688 | ||
689 | static int | |
690 | nfulnl_recv_unsupp(struct sock *ctnl, struct sk_buff *skb, | |
df6fb868 | 691 | struct nlmsghdr *nlh, struct nlattr *nfqa[]) |
0597f268 HW |
692 | { |
693 | return -ENOTSUPP; | |
694 | } | |
695 | ||
7b2f9631 | 696 | static const struct nf_logger nfulnl_logger = { |
0597f268 HW |
697 | .name = "nfnetlink_log", |
698 | .logfn = &nfulnl_log_packet, | |
699 | .me = THIS_MODULE, | |
700 | }; | |
701 | ||
fd8281ad PM |
702 | static const struct nla_policy nfula_cfg_policy[NFULA_CFG_MAX+1] = { |
703 | [NFULA_CFG_CMD] = { .len = sizeof(struct nfulnl_msg_config_cmd) }, | |
704 | [NFULA_CFG_MODE] = { .len = sizeof(struct nfulnl_msg_config_mode) }, | |
705 | [NFULA_CFG_TIMEOUT] = { .type = NLA_U32 }, | |
706 | [NFULA_CFG_QTHRESH] = { .type = NLA_U32 }, | |
707 | [NFULA_CFG_NLBUFSIZ] = { .type = NLA_U32 }, | |
708 | [NFULA_CFG_FLAGS] = { .type = NLA_U16 }, | |
0597f268 HW |
709 | }; |
710 | ||
711 | static int | |
712 | nfulnl_recv_config(struct sock *ctnl, struct sk_buff *skb, | |
df6fb868 | 713 | struct nlmsghdr *nlh, struct nlattr *nfula[]) |
0597f268 HW |
714 | { |
715 | struct nfgenmsg *nfmsg = NLMSG_DATA(nlh); | |
716 | u_int16_t group_num = ntohs(nfmsg->res_id); | |
717 | struct nfulnl_instance *inst; | |
b7047a1c | 718 | struct nfulnl_msg_config_cmd *cmd = NULL; |
0597f268 HW |
719 | int ret = 0; |
720 | ||
b7047a1c PM |
721 | if (nfula[NFULA_CFG_CMD]) { |
722 | u_int8_t pf = nfmsg->nfgen_family; | |
723 | cmd = nla_data(nfula[NFULA_CFG_CMD]); | |
724 | ||
725 | /* Commands without queue context */ | |
726 | switch (cmd->command) { | |
727 | case NFULNL_CFG_CMD_PF_BIND: | |
728 | return nf_log_register(pf, &nfulnl_logger); | |
729 | case NFULNL_CFG_CMD_PF_UNBIND: | |
730 | nf_log_unregister_pf(pf); | |
731 | return 0; | |
732 | } | |
733 | } | |
734 | ||
0597f268 | 735 | inst = instance_lookup_get(group_num); |
c0506365 PM |
736 | if (inst && inst->peer_pid != NETLINK_CB(skb).pid) { |
737 | ret = -EPERM; | |
738 | goto out_put; | |
739 | } | |
740 | ||
b7047a1c | 741 | if (cmd != NULL) { |
0597f268 HW |
742 | switch (cmd->command) { |
743 | case NFULNL_CFG_CMD_BIND: | |
744 | if (inst) { | |
745 | ret = -EBUSY; | |
746 | goto out_put; | |
747 | } | |
748 | ||
749 | inst = instance_create(group_num, | |
750 | NETLINK_CB(skb).pid); | |
baab2ce7 PM |
751 | if (IS_ERR(inst)) { |
752 | ret = PTR_ERR(inst); | |
f414c16c | 753 | goto out; |
0597f268 HW |
754 | } |
755 | break; | |
756 | case NFULNL_CFG_CMD_UNBIND: | |
757 | if (!inst) { | |
758 | ret = -ENODEV; | |
f414c16c | 759 | goto out; |
0597f268 HW |
760 | } |
761 | ||
0597f268 | 762 | instance_destroy(inst); |
9a36e8c2 | 763 | goto out; |
0597f268 | 764 | default: |
cd21f0ac | 765 | ret = -ENOTSUPP; |
0597f268 HW |
766 | break; |
767 | } | |
0597f268 HW |
768 | } |
769 | ||
df6fb868 | 770 | if (nfula[NFULA_CFG_MODE]) { |
0597f268 | 771 | struct nfulnl_msg_config_mode *params; |
df6fb868 | 772 | params = nla_data(nfula[NFULA_CFG_MODE]); |
0597f268 | 773 | |
c0506365 PM |
774 | if (!inst) { |
775 | ret = -ENODEV; | |
776 | goto out; | |
777 | } | |
0597f268 | 778 | nfulnl_set_mode(inst, params->copy_mode, |
d1208b99 | 779 | ntohl(params->copy_range)); |
0597f268 HW |
780 | } |
781 | ||
df6fb868 | 782 | if (nfula[NFULA_CFG_TIMEOUT]) { |
0dfedd28 | 783 | __be32 timeout = nla_get_be32(nfula[NFULA_CFG_TIMEOUT]); |
0597f268 | 784 | |
c0506365 PM |
785 | if (!inst) { |
786 | ret = -ENODEV; | |
787 | goto out; | |
788 | } | |
0597f268 HW |
789 | nfulnl_set_timeout(inst, ntohl(timeout)); |
790 | } | |
791 | ||
df6fb868 | 792 | if (nfula[NFULA_CFG_NLBUFSIZ]) { |
0dfedd28 | 793 | __be32 nlbufsiz = nla_get_be32(nfula[NFULA_CFG_NLBUFSIZ]); |
0597f268 | 794 | |
c0506365 PM |
795 | if (!inst) { |
796 | ret = -ENODEV; | |
797 | goto out; | |
798 | } | |
0597f268 HW |
799 | nfulnl_set_nlbufsiz(inst, ntohl(nlbufsiz)); |
800 | } | |
801 | ||
df6fb868 | 802 | if (nfula[NFULA_CFG_QTHRESH]) { |
0dfedd28 | 803 | __be32 qthresh = nla_get_be32(nfula[NFULA_CFG_QTHRESH]); |
0597f268 | 804 | |
c0506365 PM |
805 | if (!inst) { |
806 | ret = -ENODEV; | |
807 | goto out; | |
808 | } | |
0597f268 HW |
809 | nfulnl_set_qthresh(inst, ntohl(qthresh)); |
810 | } | |
811 | ||
df6fb868 | 812 | if (nfula[NFULA_CFG_FLAGS]) { |
0dfedd28 | 813 | __be16 flags = nla_get_be16(nfula[NFULA_CFG_FLAGS]); |
c0506365 PM |
814 | |
815 | if (!inst) { | |
816 | ret = -ENODEV; | |
817 | goto out; | |
818 | } | |
ee433530 | 819 | nfulnl_set_flags(inst, ntohs(flags)); |
0af5f6c1 HW |
820 | } |
821 | ||
0597f268 HW |
822 | out_put: |
823 | instance_put(inst); | |
dd16704e | 824 | out: |
0597f268 HW |
825 | return ret; |
826 | } | |
827 | ||
7c8d4cb4 | 828 | static const struct nfnl_callback nfulnl_cb[NFULNL_MSG_MAX] = { |
0597f268 | 829 | [NFULNL_MSG_PACKET] = { .call = nfulnl_recv_unsupp, |
37d2e7a2 | 830 | .attr_count = NFULA_MAX, }, |
0597f268 | 831 | [NFULNL_MSG_CONFIG] = { .call = nfulnl_recv_config, |
fd8281ad PM |
832 | .attr_count = NFULA_CFG_MAX, |
833 | .policy = nfula_cfg_policy }, | |
0597f268 HW |
834 | }; |
835 | ||
7c8d4cb4 | 836 | static const struct nfnetlink_subsystem nfulnl_subsys = { |
0597f268 HW |
837 | .name = "log", |
838 | .subsys_id = NFNL_SUBSYS_ULOG, | |
839 | .cb_count = NFULNL_MSG_MAX, | |
0597f268 HW |
840 | .cb = nfulnl_cb, |
841 | }; | |
842 | ||
843 | #ifdef CONFIG_PROC_FS | |
844 | struct iter_state { | |
845 | unsigned int bucket; | |
846 | }; | |
847 | ||
f76cdcee | 848 | static struct hlist_node *get_first(struct iter_state *st) |
0597f268 | 849 | { |
0597f268 HW |
850 | if (!st) |
851 | return NULL; | |
852 | ||
853 | for (st->bucket = 0; st->bucket < INSTANCE_BUCKETS; st->bucket++) { | |
854 | if (!hlist_empty(&instance_table[st->bucket])) | |
855 | return instance_table[st->bucket].first; | |
856 | } | |
857 | return NULL; | |
858 | } | |
859 | ||
f76cdcee | 860 | static struct hlist_node *get_next(struct iter_state *st, struct hlist_node *h) |
0597f268 | 861 | { |
0597f268 HW |
862 | h = h->next; |
863 | while (!h) { | |
864 | if (++st->bucket >= INSTANCE_BUCKETS) | |
865 | return NULL; | |
866 | ||
867 | h = instance_table[st->bucket].first; | |
868 | } | |
869 | return h; | |
870 | } | |
871 | ||
f76cdcee | 872 | static struct hlist_node *get_idx(struct iter_state *st, loff_t pos) |
0597f268 HW |
873 | { |
874 | struct hlist_node *head; | |
f76cdcee | 875 | head = get_first(st); |
0597f268 HW |
876 | |
877 | if (head) | |
f76cdcee | 878 | while (pos && (head = get_next(st, head))) |
0597f268 HW |
879 | pos--; |
880 | return pos ? NULL : head; | |
881 | } | |
882 | ||
883 | static void *seq_start(struct seq_file *seq, loff_t *pos) | |
4e26fe26 | 884 | __acquires(instances_lock) |
0597f268 HW |
885 | { |
886 | read_lock_bh(&instances_lock); | |
f76cdcee | 887 | return get_idx(seq->private, *pos); |
0597f268 HW |
888 | } |
889 | ||
890 | static void *seq_next(struct seq_file *s, void *v, loff_t *pos) | |
891 | { | |
892 | (*pos)++; | |
f76cdcee | 893 | return get_next(s->private, v); |
0597f268 HW |
894 | } |
895 | ||
896 | static void seq_stop(struct seq_file *s, void *v) | |
4e26fe26 | 897 | __releases(instances_lock) |
0597f268 HW |
898 | { |
899 | read_unlock_bh(&instances_lock); | |
900 | } | |
901 | ||
902 | static int seq_show(struct seq_file *s, void *v) | |
903 | { | |
904 | const struct nfulnl_instance *inst = v; | |
905 | ||
601e68e1 | 906 | return seq_printf(s, "%5d %6d %5d %1d %5d %6d %2d\n", |
0597f268 | 907 | inst->group_num, |
601e68e1 | 908 | inst->peer_pid, inst->qlen, |
0597f268 HW |
909 | inst->copy_mode, inst->copy_range, |
910 | inst->flushtimeout, atomic_read(&inst->use)); | |
911 | } | |
912 | ||
56b3d975 | 913 | static const struct seq_operations nful_seq_ops = { |
0597f268 HW |
914 | .start = seq_start, |
915 | .next = seq_next, | |
916 | .stop = seq_stop, | |
917 | .show = seq_show, | |
918 | }; | |
919 | ||
920 | static int nful_open(struct inode *inode, struct file *file) | |
921 | { | |
e2da5913 PE |
922 | return seq_open_private(file, &nful_seq_ops, |
923 | sizeof(struct iter_state)); | |
0597f268 HW |
924 | } |
925 | ||
da7071d7 | 926 | static const struct file_operations nful_file_ops = { |
0597f268 HW |
927 | .owner = THIS_MODULE, |
928 | .open = nful_open, | |
929 | .read = seq_read, | |
930 | .llseek = seq_lseek, | |
931 | .release = seq_release_private, | |
932 | }; | |
933 | ||
934 | #endif /* PROC_FS */ | |
935 | ||
32292a7f | 936 | static int __init nfnetlink_log_init(void) |
0597f268 HW |
937 | { |
938 | int i, status = -ENOMEM; | |
601e68e1 | 939 | |
0597f268 HW |
940 | for (i = 0; i < INSTANCE_BUCKETS; i++) |
941 | INIT_HLIST_HEAD(&instance_table[i]); | |
601e68e1 | 942 | |
0597f268 HW |
943 | /* it's not really all that important to have a random value, so |
944 | * we can do this from the init function, even if there hasn't | |
945 | * been that much entropy yet */ | |
946 | get_random_bytes(&hash_init, sizeof(hash_init)); | |
947 | ||
948 | netlink_register_notifier(&nfulnl_rtnl_notifier); | |
949 | status = nfnetlink_subsys_register(&nfulnl_subsys); | |
950 | if (status < 0) { | |
951 | printk(KERN_ERR "log: failed to create netlink socket\n"); | |
952 | goto cleanup_netlink_notifier; | |
953 | } | |
954 | ||
955 | #ifdef CONFIG_PROC_FS | |
8eeee8b1 DL |
956 | if (!proc_create("nfnetlink_log", 0440, |
957 | proc_net_netfilter, &nful_file_ops)) | |
0597f268 | 958 | goto cleanup_subsys; |
0597f268 | 959 | #endif |
0597f268 HW |
960 | return status; |
961 | ||
0597f268 | 962 | #ifdef CONFIG_PROC_FS |
0597f268 | 963 | cleanup_subsys: |
0597f268 | 964 | nfnetlink_subsys_unregister(&nfulnl_subsys); |
32292a7f | 965 | #endif |
0597f268 HW |
966 | cleanup_netlink_notifier: |
967 | netlink_unregister_notifier(&nfulnl_rtnl_notifier); | |
968 | return status; | |
969 | } | |
970 | ||
65b4b4e8 | 971 | static void __exit nfnetlink_log_fini(void) |
0597f268 | 972 | { |
e92ad99c | 973 | nf_log_unregister(&nfulnl_logger); |
32292a7f PM |
974 | #ifdef CONFIG_PROC_FS |
975 | remove_proc_entry("nfnetlink_log", proc_net_netfilter); | |
976 | #endif | |
977 | nfnetlink_subsys_unregister(&nfulnl_subsys); | |
978 | netlink_unregister_notifier(&nfulnl_rtnl_notifier); | |
0597f268 HW |
979 | } |
980 | ||
981 | MODULE_DESCRIPTION("netfilter userspace logging"); | |
982 | MODULE_AUTHOR("Harald Welte <laforge@netfilter.org>"); | |
983 | MODULE_LICENSE("GPL"); | |
f682faef | 984 | MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_ULOG); |
0597f268 | 985 | |
65b4b4e8 AM |
986 | module_init(nfnetlink_log_init); |
987 | module_exit(nfnetlink_log_fini); |