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> |
0597f268 HW |
33 | |
34 | #include <asm/atomic.h> | |
35 | ||
fbcd923c HW |
36 | #ifdef CONFIG_BRIDGE_NETFILTER |
37 | #include "../bridge/br_private.h" | |
38 | #endif | |
39 | ||
c2db2924 | 40 | #define NFULNL_NLBUFSIZ_DEFAULT NLMSG_GOODSIZE |
6b6ec99a | 41 | #define NFULNL_TIMEOUT_DEFAULT HZ /* every second */ |
0597f268 | 42 | #define NFULNL_QTHRESH_DEFAULT 100 /* 100 packets */ |
6b6ec99a | 43 | #define NFULNL_COPY_RANGE_MAX 0xFFFF /* max packet size is limited by 16-bit struct nfattr nfa_len field */ |
0597f268 HW |
44 | |
45 | #define PRINTR(x, args...) do { if (net_ratelimit()) \ | |
46 | printk(x, ## args); } while (0); | |
47 | ||
0597f268 HW |
48 | struct nfulnl_instance { |
49 | struct hlist_node hlist; /* global list of instances */ | |
50 | spinlock_t lock; | |
51 | atomic_t use; /* use count */ | |
52 | ||
53 | unsigned int qlen; /* number of nlmsgs in skb */ | |
54 | struct sk_buff *skb; /* pre-allocatd skb */ | |
0597f268 HW |
55 | struct timer_list timer; |
56 | int peer_pid; /* PID of the peer process */ | |
57 | ||
58 | /* configurable parameters */ | |
59 | unsigned int flushtimeout; /* timeout until queue flush */ | |
60 | unsigned int nlbufsiz; /* netlink buffer allocation size */ | |
61 | unsigned int qthreshold; /* threshold of the queue */ | |
62 | u_int32_t copy_range; | |
0af5f6c1 | 63 | u_int32_t seq; /* instance-local sequential counter */ |
0597f268 | 64 | u_int16_t group_num; /* number of this queue */ |
0af5f6c1 | 65 | u_int16_t flags; |
601e68e1 | 66 | u_int8_t copy_mode; |
0597f268 HW |
67 | }; |
68 | ||
69 | static DEFINE_RWLOCK(instances_lock); | |
0af5f6c1 | 70 | static atomic_t global_seq; |
0597f268 HW |
71 | |
72 | #define INSTANCE_BUCKETS 16 | |
73 | static struct hlist_head instance_table[INSTANCE_BUCKETS]; | |
74 | static unsigned int hash_init; | |
75 | ||
76 | static inline u_int8_t instance_hashfn(u_int16_t group_num) | |
77 | { | |
78 | return ((group_num & 0xff) % INSTANCE_BUCKETS); | |
79 | } | |
80 | ||
81 | static struct nfulnl_instance * | |
82 | __instance_lookup(u_int16_t group_num) | |
83 | { | |
84 | struct hlist_head *head; | |
85 | struct hlist_node *pos; | |
86 | struct nfulnl_instance *inst; | |
87 | ||
0597f268 HW |
88 | head = &instance_table[instance_hashfn(group_num)]; |
89 | hlist_for_each_entry(inst, pos, head, hlist) { | |
90 | if (inst->group_num == group_num) | |
91 | return inst; | |
92 | } | |
93 | return NULL; | |
94 | } | |
95 | ||
96 | static inline void | |
97 | instance_get(struct nfulnl_instance *inst) | |
98 | { | |
99 | atomic_inc(&inst->use); | |
100 | } | |
101 | ||
102 | static struct nfulnl_instance * | |
103 | instance_lookup_get(u_int16_t group_num) | |
104 | { | |
105 | struct nfulnl_instance *inst; | |
106 | ||
107 | read_lock_bh(&instances_lock); | |
108 | inst = __instance_lookup(group_num); | |
109 | if (inst) | |
110 | instance_get(inst); | |
111 | read_unlock_bh(&instances_lock); | |
112 | ||
113 | return inst; | |
114 | } | |
115 | ||
116 | static void | |
117 | instance_put(struct nfulnl_instance *inst) | |
118 | { | |
119 | if (inst && atomic_dec_and_test(&inst->use)) { | |
0597f268 | 120 | kfree(inst); |
7d90e86d | 121 | module_put(THIS_MODULE); |
0597f268 HW |
122 | } |
123 | } | |
124 | ||
125 | static void nfulnl_timer(unsigned long data); | |
126 | ||
127 | static struct nfulnl_instance * | |
128 | instance_create(u_int16_t group_num, int pid) | |
129 | { | |
130 | struct nfulnl_instance *inst; | |
baab2ce7 | 131 | int err; |
0597f268 | 132 | |
601e68e1 | 133 | write_lock_bh(&instances_lock); |
0597f268 | 134 | if (__instance_lookup(group_num)) { |
baab2ce7 | 135 | err = -EEXIST; |
0597f268 HW |
136 | goto out_unlock; |
137 | } | |
138 | ||
10dfdc69 | 139 | inst = kzalloc(sizeof(*inst), GFP_ATOMIC); |
baab2ce7 PM |
140 | if (!inst) { |
141 | err = -ENOMEM; | |
0597f268 | 142 | goto out_unlock; |
baab2ce7 | 143 | } |
0597f268 | 144 | |
aace57e0 MM |
145 | if (!try_module_get(THIS_MODULE)) { |
146 | kfree(inst); | |
baab2ce7 | 147 | err = -EAGAIN; |
aace57e0 MM |
148 | goto out_unlock; |
149 | } | |
150 | ||
0597f268 | 151 | INIT_HLIST_NODE(&inst->hlist); |
181a46a5 | 152 | spin_lock_init(&inst->lock); |
0597f268 HW |
153 | /* needs to be two, since we _put() after creation */ |
154 | atomic_set(&inst->use, 2); | |
155 | ||
e6f689db | 156 | setup_timer(&inst->timer, nfulnl_timer, (unsigned long)inst); |
0597f268 HW |
157 | |
158 | inst->peer_pid = pid; | |
159 | inst->group_num = group_num; | |
160 | ||
161 | inst->qthreshold = NFULNL_QTHRESH_DEFAULT; | |
162 | inst->flushtimeout = NFULNL_TIMEOUT_DEFAULT; | |
163 | inst->nlbufsiz = NFULNL_NLBUFSIZ_DEFAULT; | |
164 | inst->copy_mode = NFULNL_COPY_PACKET; | |
6b6ec99a | 165 | inst->copy_range = NFULNL_COPY_RANGE_MAX; |
0597f268 | 166 | |
601e68e1 | 167 | hlist_add_head(&inst->hlist, |
0597f268 HW |
168 | &instance_table[instance_hashfn(group_num)]); |
169 | ||
0597f268 HW |
170 | write_unlock_bh(&instances_lock); |
171 | ||
172 | return inst; | |
173 | ||
0597f268 HW |
174 | out_unlock: |
175 | write_unlock_bh(&instances_lock); | |
baab2ce7 | 176 | return ERR_PTR(err); |
0597f268 HW |
177 | } |
178 | ||
e3567061 | 179 | static void __nfulnl_flush(struct nfulnl_instance *inst); |
0597f268 HW |
180 | |
181 | static void | |
9afdb00c | 182 | __instance_destroy(struct nfulnl_instance *inst) |
0597f268 HW |
183 | { |
184 | /* first pull it out of the global list */ | |
0597f268 HW |
185 | hlist_del(&inst->hlist); |
186 | ||
0597f268 HW |
187 | /* then flush all pending packets from skb */ |
188 | ||
189 | spin_lock_bh(&inst->lock); | |
e3567061 MM |
190 | if (inst->skb) |
191 | __nfulnl_flush(inst); | |
0597f268 HW |
192 | spin_unlock_bh(&inst->lock); |
193 | ||
194 | /* and finally put the refcount */ | |
195 | instance_put(inst); | |
0597f268 HW |
196 | } |
197 | ||
0597f268 HW |
198 | static inline void |
199 | instance_destroy(struct nfulnl_instance *inst) | |
200 | { | |
9afdb00c PM |
201 | write_lock_bh(&instances_lock); |
202 | __instance_destroy(inst); | |
203 | write_unlock_bh(&instances_lock); | |
0597f268 HW |
204 | } |
205 | ||
206 | static int | |
207 | nfulnl_set_mode(struct nfulnl_instance *inst, u_int8_t mode, | |
208 | unsigned int range) | |
209 | { | |
210 | int status = 0; | |
211 | ||
212 | spin_lock_bh(&inst->lock); | |
601e68e1 | 213 | |
0597f268 HW |
214 | switch (mode) { |
215 | case NFULNL_COPY_NONE: | |
216 | case NFULNL_COPY_META: | |
217 | inst->copy_mode = mode; | |
218 | inst->copy_range = 0; | |
219 | break; | |
601e68e1 | 220 | |
0597f268 HW |
221 | case NFULNL_COPY_PACKET: |
222 | inst->copy_mode = mode; | |
6b6ec99a MM |
223 | inst->copy_range = min_t(unsigned int, |
224 | range, NFULNL_COPY_RANGE_MAX); | |
0597f268 | 225 | break; |
601e68e1 | 226 | |
0597f268 HW |
227 | default: |
228 | status = -EINVAL; | |
229 | break; | |
230 | } | |
231 | ||
232 | spin_unlock_bh(&inst->lock); | |
233 | ||
234 | return status; | |
235 | } | |
236 | ||
237 | static int | |
238 | nfulnl_set_nlbufsiz(struct nfulnl_instance *inst, u_int32_t nlbufsiz) | |
239 | { | |
240 | int status; | |
241 | ||
242 | spin_lock_bh(&inst->lock); | |
243 | if (nlbufsiz < NFULNL_NLBUFSIZ_DEFAULT) | |
244 | status = -ERANGE; | |
245 | else if (nlbufsiz > 131072) | |
246 | status = -ERANGE; | |
247 | else { | |
248 | inst->nlbufsiz = nlbufsiz; | |
249 | status = 0; | |
250 | } | |
251 | spin_unlock_bh(&inst->lock); | |
252 | ||
253 | return status; | |
254 | } | |
255 | ||
256 | static int | |
257 | nfulnl_set_timeout(struct nfulnl_instance *inst, u_int32_t timeout) | |
258 | { | |
259 | spin_lock_bh(&inst->lock); | |
260 | inst->flushtimeout = timeout; | |
261 | spin_unlock_bh(&inst->lock); | |
262 | ||
263 | return 0; | |
264 | } | |
265 | ||
266 | static int | |
267 | nfulnl_set_qthresh(struct nfulnl_instance *inst, u_int32_t qthresh) | |
268 | { | |
269 | spin_lock_bh(&inst->lock); | |
270 | inst->qthreshold = qthresh; | |
271 | spin_unlock_bh(&inst->lock); | |
272 | ||
273 | return 0; | |
274 | } | |
275 | ||
0af5f6c1 HW |
276 | static int |
277 | nfulnl_set_flags(struct nfulnl_instance *inst, u_int16_t flags) | |
278 | { | |
279 | spin_lock_bh(&inst->lock); | |
ee433530 | 280 | inst->flags = flags; |
0af5f6c1 HW |
281 | spin_unlock_bh(&inst->lock); |
282 | ||
283 | return 0; | |
284 | } | |
285 | ||
c6a8f648 MM |
286 | static struct sk_buff * |
287 | nfulnl_alloc_skb(unsigned int inst_size, unsigned int pkt_size) | |
0597f268 HW |
288 | { |
289 | struct sk_buff *skb; | |
ad2ad0f9 | 290 | unsigned int n; |
0597f268 | 291 | |
0597f268 HW |
292 | /* alloc skb which should be big enough for a whole multipart |
293 | * message. WARNING: has to be <= 128k due to slab restrictions */ | |
294 | ||
ad2ad0f9 PM |
295 | n = max(inst_size, pkt_size); |
296 | skb = alloc_skb(n, GFP_ATOMIC); | |
0597f268 HW |
297 | if (!skb) { |
298 | PRINTR("nfnetlink_log: can't alloc whole buffer (%u bytes)\n", | |
299 | inst_size); | |
300 | ||
ad2ad0f9 PM |
301 | if (n > pkt_size) { |
302 | /* try to allocate only as much as we need for current | |
303 | * packet */ | |
0597f268 | 304 | |
ad2ad0f9 PM |
305 | skb = alloc_skb(pkt_size, GFP_ATOMIC); |
306 | if (!skb) | |
307 | PRINTR("nfnetlink_log: can't even alloc %u " | |
308 | "bytes\n", pkt_size); | |
309 | } | |
0597f268 HW |
310 | } |
311 | ||
312 | return skb; | |
313 | } | |
314 | ||
315 | static int | |
316 | __nfulnl_send(struct nfulnl_instance *inst) | |
317 | { | |
29c5d4af | 318 | int status = -1; |
0597f268 | 319 | |
0597f268 | 320 | if (inst->qlen > 1) |
29c5d4af EL |
321 | NLMSG_PUT(inst->skb, 0, 0, |
322 | NLMSG_DONE, | |
323 | sizeof(struct nfgenmsg)); | |
0597f268 HW |
324 | |
325 | status = nfnetlink_unicast(inst->skb, inst->peer_pid, MSG_DONTWAIT); | |
0597f268 HW |
326 | |
327 | inst->qlen = 0; | |
328 | inst->skb = NULL; | |
0597f268 | 329 | |
29c5d4af | 330 | nlmsg_failure: |
0597f268 HW |
331 | return status; |
332 | } | |
333 | ||
e3567061 MM |
334 | static void |
335 | __nfulnl_flush(struct nfulnl_instance *inst) | |
336 | { | |
337 | /* timer holds a reference */ | |
338 | if (del_timer(&inst->timer)) | |
339 | instance_put(inst); | |
340 | if (inst->skb) | |
341 | __nfulnl_send(inst); | |
342 | } | |
343 | ||
c6a8f648 MM |
344 | static void |
345 | nfulnl_timer(unsigned long data) | |
0597f268 | 346 | { |
601e68e1 | 347 | struct nfulnl_instance *inst = (struct nfulnl_instance *)data; |
0597f268 | 348 | |
0597f268 | 349 | spin_lock_bh(&inst->lock); |
370e6a87 MM |
350 | if (inst->skb) |
351 | __nfulnl_send(inst); | |
0597f268 | 352 | spin_unlock_bh(&inst->lock); |
05f7b7b3 | 353 | instance_put(inst); |
0597f268 HW |
354 | } |
355 | ||
0af5f6c1 HW |
356 | /* This is an inline function, we don't really care about a long |
357 | * list of arguments */ | |
601e68e1 | 358 | static inline int |
0597f268 | 359 | __build_packet_message(struct nfulnl_instance *inst, |
601e68e1 | 360 | const struct sk_buff *skb, |
0597f268 HW |
361 | unsigned int data_len, |
362 | unsigned int pf, | |
363 | unsigned int hooknum, | |
364 | const struct net_device *indev, | |
365 | const struct net_device *outdev, | |
366 | const struct nf_loginfo *li, | |
d7a5c324 | 367 | const char *prefix, unsigned int plen) |
0597f268 | 368 | { |
0597f268 HW |
369 | struct nfulnl_msg_packet_hdr pmsg; |
370 | struct nlmsghdr *nlh; | |
371 | struct nfgenmsg *nfmsg; | |
98a4a861 | 372 | __be32 tmp_uint; |
27a884dc | 373 | sk_buff_data_t old_tail = inst->skb->tail; |
0597f268 | 374 | |
601e68e1 | 375 | nlh = NLMSG_PUT(inst->skb, 0, 0, |
0597f268 HW |
376 | NFNL_SUBSYS_ULOG << 8 | NFULNL_MSG_PACKET, |
377 | sizeof(struct nfgenmsg)); | |
378 | nfmsg = NLMSG_DATA(nlh); | |
379 | nfmsg->nfgen_family = pf; | |
380 | nfmsg->version = NFNETLINK_V0; | |
381 | nfmsg->res_id = htons(inst->group_num); | |
382 | ||
febf0a43 | 383 | pmsg.hw_protocol = skb->protocol; |
0597f268 HW |
384 | pmsg.hook = hooknum; |
385 | ||
df6fb868 | 386 | NLA_PUT(inst->skb, NFULA_PACKET_HDR, sizeof(pmsg), &pmsg); |
0597f268 | 387 | |
d7a5c324 | 388 | if (prefix) |
df6fb868 | 389 | NLA_PUT(inst->skb, NFULA_PREFIX, plen, prefix); |
0597f268 HW |
390 | |
391 | if (indev) { | |
fbcd923c | 392 | #ifndef CONFIG_BRIDGE_NETFILTER |
0dfedd28 PM |
393 | NLA_PUT_BE32(inst->skb, NFULA_IFINDEX_INDEV, |
394 | htonl(indev->ifindex)); | |
fbcd923c HW |
395 | #else |
396 | if (pf == PF_BRIDGE) { | |
397 | /* Case 1: outdev is physical input device, we need to | |
398 | * look for bridge group (when called from | |
399 | * netfilter_bridge) */ | |
0dfedd28 PM |
400 | NLA_PUT_BE32(inst->skb, NFULA_IFINDEX_PHYSINDEV, |
401 | htonl(indev->ifindex)); | |
fbcd923c | 402 | /* this is the bridge group "brX" */ |
0dfedd28 PM |
403 | NLA_PUT_BE32(inst->skb, NFULA_IFINDEX_INDEV, |
404 | htonl(indev->br_port->br->dev->ifindex)); | |
fbcd923c HW |
405 | } else { |
406 | /* Case 2: indev is bridge group, we need to look for | |
407 | * physical device (when called from ipv4) */ | |
0dfedd28 PM |
408 | NLA_PUT_BE32(inst->skb, NFULA_IFINDEX_INDEV, |
409 | htonl(indev->ifindex)); | |
410 | if (skb->nf_bridge && skb->nf_bridge->physindev) | |
411 | NLA_PUT_BE32(inst->skb, NFULA_IFINDEX_PHYSINDEV, | |
412 | htonl(skb->nf_bridge->physindev->ifindex)); | |
fbcd923c HW |
413 | } |
414 | #endif | |
0597f268 HW |
415 | } |
416 | ||
417 | if (outdev) { | |
418 | tmp_uint = htonl(outdev->ifindex); | |
fbcd923c | 419 | #ifndef CONFIG_BRIDGE_NETFILTER |
0dfedd28 PM |
420 | NLA_PUT_BE32(inst->skb, NFULA_IFINDEX_OUTDEV, |
421 | htonl(outdev->ifindex)); | |
fbcd923c HW |
422 | #else |
423 | if (pf == PF_BRIDGE) { | |
424 | /* Case 1: outdev is physical output device, we need to | |
425 | * look for bridge group (when called from | |
426 | * netfilter_bridge) */ | |
0dfedd28 PM |
427 | NLA_PUT_BE32(inst->skb, NFULA_IFINDEX_PHYSOUTDEV, |
428 | htonl(outdev->ifindex)); | |
fbcd923c | 429 | /* this is the bridge group "brX" */ |
0dfedd28 PM |
430 | NLA_PUT_BE32(inst->skb, NFULA_IFINDEX_OUTDEV, |
431 | htonl(outdev->br_port->br->dev->ifindex)); | |
fbcd923c HW |
432 | } else { |
433 | /* Case 2: indev is a bridge group, we need to look | |
434 | * for physical device (when called from ipv4) */ | |
0dfedd28 PM |
435 | NLA_PUT_BE32(inst->skb, NFULA_IFINDEX_OUTDEV, |
436 | htonl(outdev->ifindex)); | |
437 | if (skb->nf_bridge && skb->nf_bridge->physoutdev) | |
438 | NLA_PUT_BE32(inst->skb, NFULA_IFINDEX_PHYSOUTDEV, | |
439 | htonl(skb->nf_bridge->physoutdev->ifindex)); | |
fbcd923c HW |
440 | } |
441 | #endif | |
0597f268 HW |
442 | } |
443 | ||
0dfedd28 PM |
444 | if (skb->mark) |
445 | NLA_PUT_BE32(inst->skb, NFULA_MARK, htonl(skb->mark)); | |
0597f268 | 446 | |
b95cce35 | 447 | if (indev && skb->dev) { |
0597f268 | 448 | struct nfulnl_msg_packet_hw phw; |
b95cce35 SH |
449 | int len = dev_parse_header(skb, phw.hw_addr); |
450 | if (len > 0) { | |
451 | phw.hw_addrlen = htons(len); | |
df6fb868 | 452 | NLA_PUT(inst->skb, NFULA_HWADDR, sizeof(phw), &phw); |
b95cce35 | 453 | } |
0597f268 HW |
454 | } |
455 | ||
b7aa0bf7 | 456 | if (skb->tstamp.tv64) { |
0597f268 | 457 | struct nfulnl_msg_packet_timestamp ts; |
b7aa0bf7 ED |
458 | struct timeval tv = ktime_to_timeval(skb->tstamp); |
459 | ts.sec = cpu_to_be64(tv.tv_sec); | |
460 | ts.usec = cpu_to_be64(tv.tv_usec); | |
0597f268 | 461 | |
df6fb868 | 462 | NLA_PUT(inst->skb, NFULA_TIMESTAMP, sizeof(ts), &ts); |
0597f268 HW |
463 | } |
464 | ||
465 | /* UID */ | |
466 | if (skb->sk) { | |
467 | read_lock_bh(&skb->sk->sk_callback_lock); | |
468 | if (skb->sk->sk_socket && skb->sk->sk_socket->file) { | |
98a4a861 | 469 | __be32 uid = htonl(skb->sk->sk_socket->file->f_uid); |
41d0cded | 470 | __be32 gid = htonl(skb->sk->sk_socket->file->f_gid); |
df6fb868 | 471 | /* need to unlock here since NLA_PUT may goto */ |
0597f268 | 472 | read_unlock_bh(&skb->sk->sk_callback_lock); |
0dfedd28 | 473 | NLA_PUT_BE32(inst->skb, NFULA_UID, uid); |
76aa1ce1 | 474 | NLA_PUT_BE32(inst->skb, NFULA_GID, gid); |
0597f268 HW |
475 | } else |
476 | read_unlock_bh(&skb->sk->sk_callback_lock); | |
477 | } | |
478 | ||
0af5f6c1 | 479 | /* local sequence number */ |
0dfedd28 PM |
480 | if (inst->flags & NFULNL_CFG_F_SEQ) |
481 | NLA_PUT_BE32(inst->skb, NFULA_SEQ, htonl(inst->seq++)); | |
482 | ||
0af5f6c1 | 483 | /* global sequence number */ |
0dfedd28 PM |
484 | if (inst->flags & NFULNL_CFG_F_SEQ_GLOBAL) |
485 | NLA_PUT_BE32(inst->skb, NFULA_SEQ_GLOBAL, | |
486 | htonl(atomic_inc_return(&global_seq))); | |
0af5f6c1 | 487 | |
0597f268 | 488 | if (data_len) { |
df6fb868 PM |
489 | struct nlattr *nla; |
490 | int size = nla_attr_size(data_len); | |
0597f268 | 491 | |
df6fb868 | 492 | if (skb_tailroom(inst->skb) < nla_total_size(data_len)) { |
0597f268 HW |
493 | printk(KERN_WARNING "nfnetlink_log: no tailroom!\n"); |
494 | goto nlmsg_failure; | |
495 | } | |
496 | ||
df6fb868 PM |
497 | nla = (struct nlattr *)skb_put(inst->skb, nla_total_size(data_len)); |
498 | nla->nla_type = NFULA_PAYLOAD; | |
499 | nla->nla_len = size; | |
0597f268 | 500 | |
df6fb868 | 501 | if (skb_copy_bits(skb, 0, nla_data(nla), data_len)) |
0597f268 HW |
502 | BUG(); |
503 | } | |
601e68e1 | 504 | |
0597f268 HW |
505 | nlh->nlmsg_len = inst->skb->tail - old_tail; |
506 | return 0; | |
507 | ||
508 | nlmsg_failure: | |
df6fb868 | 509 | nla_put_failure: |
0597f268 HW |
510 | PRINTR(KERN_ERR "nfnetlink_log: error creating log nlmsg\n"); |
511 | return -1; | |
512 | } | |
513 | ||
514 | #define RCV_SKB_FAIL(err) do { netlink_ack(skb, nlh, (err)); return; } while (0) | |
515 | ||
516 | static struct nf_loginfo default_loginfo = { | |
517 | .type = NF_LOG_TYPE_ULOG, | |
518 | .u = { | |
519 | .ulog = { | |
520 | .copy_len = 0xffff, | |
521 | .group = 0, | |
522 | .qthreshold = 1, | |
523 | }, | |
524 | }, | |
525 | }; | |
526 | ||
527 | /* log handler for internal netfilter logging api */ | |
528 | static void | |
529 | nfulnl_log_packet(unsigned int pf, | |
530 | unsigned int hooknum, | |
531 | const struct sk_buff *skb, | |
532 | const struct net_device *in, | |
533 | const struct net_device *out, | |
534 | const struct nf_loginfo *li_user, | |
535 | const char *prefix) | |
536 | { | |
537 | unsigned int size, data_len; | |
538 | struct nfulnl_instance *inst; | |
539 | const struct nf_loginfo *li; | |
540 | unsigned int qthreshold; | |
d7a5c324 | 541 | unsigned int plen; |
0597f268 | 542 | |
601e68e1 | 543 | if (li_user && li_user->type == NF_LOG_TYPE_ULOG) |
0597f268 HW |
544 | li = li_user; |
545 | else | |
546 | li = &default_loginfo; | |
547 | ||
548 | inst = instance_lookup_get(li->u.ulog.group); | |
549 | if (!inst) | |
0597f268 | 550 | return; |
0597f268 | 551 | |
d7a5c324 PM |
552 | plen = 0; |
553 | if (prefix) | |
881dbfe8 | 554 | plen = strlen(prefix) + 1; |
d7a5c324 | 555 | |
0597f268 HW |
556 | /* FIXME: do we want to make the size calculation conditional based on |
557 | * what is actually present? way more branches and checks, but more | |
558 | * memory efficient... */ | |
7000d38d | 559 | size = NLMSG_SPACE(sizeof(struct nfgenmsg)) |
df6fb868 PM |
560 | + nla_total_size(sizeof(struct nfulnl_msg_packet_hdr)) |
561 | + nla_total_size(sizeof(u_int32_t)) /* ifindex */ | |
562 | + nla_total_size(sizeof(u_int32_t)) /* ifindex */ | |
fbcd923c | 563 | #ifdef CONFIG_BRIDGE_NETFILTER |
df6fb868 PM |
564 | + nla_total_size(sizeof(u_int32_t)) /* ifindex */ |
565 | + nla_total_size(sizeof(u_int32_t)) /* ifindex */ | |
fbcd923c | 566 | #endif |
df6fb868 PM |
567 | + nla_total_size(sizeof(u_int32_t)) /* mark */ |
568 | + nla_total_size(sizeof(u_int32_t)) /* uid */ | |
76aa1ce1 | 569 | + nla_total_size(sizeof(u_int32_t)) /* gid */ |
df6fb868 PM |
570 | + nla_total_size(plen) /* prefix */ |
571 | + nla_total_size(sizeof(struct nfulnl_msg_packet_hw)) | |
572 | + nla_total_size(sizeof(struct nfulnl_msg_packet_timestamp)); | |
0597f268 | 573 | |
0597f268 HW |
574 | spin_lock_bh(&inst->lock); |
575 | ||
0af5f6c1 | 576 | if (inst->flags & NFULNL_CFG_F_SEQ) |
df6fb868 | 577 | size += nla_total_size(sizeof(u_int32_t)); |
0af5f6c1 | 578 | if (inst->flags & NFULNL_CFG_F_SEQ_GLOBAL) |
df6fb868 | 579 | size += nla_total_size(sizeof(u_int32_t)); |
0af5f6c1 | 580 | |
0597f268 HW |
581 | qthreshold = inst->qthreshold; |
582 | /* per-rule qthreshold overrides per-instance */ | |
583 | if (qthreshold > li->u.ulog.qthreshold) | |
584 | qthreshold = li->u.ulog.qthreshold; | |
601e68e1 | 585 | |
0597f268 HW |
586 | switch (inst->copy_mode) { |
587 | case NFULNL_COPY_META: | |
588 | case NFULNL_COPY_NONE: | |
589 | data_len = 0; | |
590 | break; | |
601e68e1 | 591 | |
0597f268 | 592 | case NFULNL_COPY_PACKET: |
601e68e1 | 593 | if (inst->copy_range == 0 |
0597f268 HW |
594 | || inst->copy_range > skb->len) |
595 | data_len = skb->len; | |
596 | else | |
597 | data_len = inst->copy_range; | |
601e68e1 | 598 | |
df6fb868 | 599 | size += nla_total_size(data_len); |
0597f268 | 600 | break; |
601e68e1 | 601 | |
0597f268 | 602 | default: |
55b5a91e | 603 | goto unlock_and_release; |
0597f268 HW |
604 | } |
605 | ||
d63b043d MM |
606 | if (inst->skb && |
607 | size > skb_tailroom(inst->skb) - sizeof(struct nfgenmsg)) { | |
0597f268 HW |
608 | /* either the queue len is too high or we don't have |
609 | * enough room in the skb left. flush to userspace. */ | |
e3567061 | 610 | __nfulnl_flush(inst); |
55b5a91e | 611 | } |
0597f268 | 612 | |
55b5a91e MM |
613 | if (!inst->skb) { |
614 | inst->skb = nfulnl_alloc_skb(inst->nlbufsiz, size); | |
615 | if (!inst->skb) | |
0597f268 | 616 | goto alloc_failure; |
0597f268 HW |
617 | } |
618 | ||
0597f268 HW |
619 | inst->qlen++; |
620 | ||
621 | __build_packet_message(inst, skb, data_len, pf, | |
d7a5c324 | 622 | hooknum, in, out, li, prefix, plen); |
0597f268 | 623 | |
d63b043d MM |
624 | if (inst->qlen >= qthreshold) |
625 | __nfulnl_flush(inst); | |
0597f268 HW |
626 | /* timer_pending always called within inst->lock, so there |
627 | * is no chance of a race here */ | |
d63b043d | 628 | else if (!timer_pending(&inst->timer)) { |
0597f268 HW |
629 | instance_get(inst); |
630 | inst->timer.expires = jiffies + (inst->flushtimeout*HZ/100); | |
631 | add_timer(&inst->timer); | |
632 | } | |
0597f268 | 633 | |
ed32abea MM |
634 | unlock_and_release: |
635 | spin_unlock_bh(&inst->lock); | |
636 | instance_put(inst); | |
0597f268 HW |
637 | return; |
638 | ||
639 | alloc_failure: | |
0597f268 | 640 | /* FIXME: statistics */ |
ed32abea | 641 | goto unlock_and_release; |
0597f268 HW |
642 | } |
643 | ||
644 | static int | |
645 | nfulnl_rcv_nl_event(struct notifier_block *this, | |
646 | unsigned long event, void *ptr) | |
647 | { | |
648 | struct netlink_notify *n = ptr; | |
649 | ||
650 | if (event == NETLINK_URELEASE && | |
651 | n->protocol == NETLINK_NETFILTER && n->pid) { | |
652 | int i; | |
653 | ||
654 | /* destroy all instances for this pid */ | |
655 | write_lock_bh(&instances_lock); | |
656 | for (i = 0; i < INSTANCE_BUCKETS; i++) { | |
657 | struct hlist_node *tmp, *t2; | |
658 | struct nfulnl_instance *inst; | |
659 | struct hlist_head *head = &instance_table[i]; | |
660 | ||
661 | hlist_for_each_entry_safe(inst, tmp, t2, head, hlist) { | |
b4b51029 EB |
662 | if ((n->net == &init_net) && |
663 | (n->pid == inst->peer_pid)) | |
0597f268 HW |
664 | __instance_destroy(inst); |
665 | } | |
666 | } | |
667 | write_unlock_bh(&instances_lock); | |
668 | } | |
669 | return NOTIFY_DONE; | |
670 | } | |
671 | ||
672 | static struct notifier_block nfulnl_rtnl_notifier = { | |
673 | .notifier_call = nfulnl_rcv_nl_event, | |
674 | }; | |
675 | ||
676 | static int | |
677 | nfulnl_recv_unsupp(struct sock *ctnl, struct sk_buff *skb, | |
df6fb868 | 678 | struct nlmsghdr *nlh, struct nlattr *nfqa[]) |
0597f268 HW |
679 | { |
680 | return -ENOTSUPP; | |
681 | } | |
682 | ||
7b2f9631 | 683 | static const struct nf_logger nfulnl_logger = { |
0597f268 HW |
684 | .name = "nfnetlink_log", |
685 | .logfn = &nfulnl_log_packet, | |
686 | .me = THIS_MODULE, | |
687 | }; | |
688 | ||
fd8281ad PM |
689 | static const struct nla_policy nfula_cfg_policy[NFULA_CFG_MAX+1] = { |
690 | [NFULA_CFG_CMD] = { .len = sizeof(struct nfulnl_msg_config_cmd) }, | |
691 | [NFULA_CFG_MODE] = { .len = sizeof(struct nfulnl_msg_config_mode) }, | |
692 | [NFULA_CFG_TIMEOUT] = { .type = NLA_U32 }, | |
693 | [NFULA_CFG_QTHRESH] = { .type = NLA_U32 }, | |
694 | [NFULA_CFG_NLBUFSIZ] = { .type = NLA_U32 }, | |
695 | [NFULA_CFG_FLAGS] = { .type = NLA_U16 }, | |
0597f268 HW |
696 | }; |
697 | ||
698 | static int | |
699 | nfulnl_recv_config(struct sock *ctnl, struct sk_buff *skb, | |
df6fb868 | 700 | struct nlmsghdr *nlh, struct nlattr *nfula[]) |
0597f268 HW |
701 | { |
702 | struct nfgenmsg *nfmsg = NLMSG_DATA(nlh); | |
703 | u_int16_t group_num = ntohs(nfmsg->res_id); | |
704 | struct nfulnl_instance *inst; | |
b7047a1c | 705 | struct nfulnl_msg_config_cmd *cmd = NULL; |
0597f268 HW |
706 | int ret = 0; |
707 | ||
b7047a1c PM |
708 | if (nfula[NFULA_CFG_CMD]) { |
709 | u_int8_t pf = nfmsg->nfgen_family; | |
710 | cmd = nla_data(nfula[NFULA_CFG_CMD]); | |
711 | ||
712 | /* Commands without queue context */ | |
713 | switch (cmd->command) { | |
714 | case NFULNL_CFG_CMD_PF_BIND: | |
715 | return nf_log_register(pf, &nfulnl_logger); | |
716 | case NFULNL_CFG_CMD_PF_UNBIND: | |
717 | nf_log_unregister_pf(pf); | |
718 | return 0; | |
719 | } | |
720 | } | |
721 | ||
0597f268 | 722 | inst = instance_lookup_get(group_num); |
c0506365 PM |
723 | if (inst && inst->peer_pid != NETLINK_CB(skb).pid) { |
724 | ret = -EPERM; | |
725 | goto out_put; | |
726 | } | |
727 | ||
b7047a1c | 728 | if (cmd != NULL) { |
0597f268 HW |
729 | switch (cmd->command) { |
730 | case NFULNL_CFG_CMD_BIND: | |
731 | if (inst) { | |
732 | ret = -EBUSY; | |
733 | goto out_put; | |
734 | } | |
735 | ||
736 | inst = instance_create(group_num, | |
737 | NETLINK_CB(skb).pid); | |
baab2ce7 PM |
738 | if (IS_ERR(inst)) { |
739 | ret = PTR_ERR(inst); | |
f414c16c | 740 | goto out; |
0597f268 HW |
741 | } |
742 | break; | |
743 | case NFULNL_CFG_CMD_UNBIND: | |
744 | if (!inst) { | |
745 | ret = -ENODEV; | |
f414c16c | 746 | goto out; |
0597f268 HW |
747 | } |
748 | ||
0597f268 | 749 | instance_destroy(inst); |
9a36e8c2 | 750 | goto out; |
0597f268 | 751 | default: |
cd21f0ac | 752 | ret = -ENOTSUPP; |
0597f268 HW |
753 | break; |
754 | } | |
0597f268 HW |
755 | } |
756 | ||
df6fb868 | 757 | if (nfula[NFULA_CFG_MODE]) { |
0597f268 | 758 | struct nfulnl_msg_config_mode *params; |
df6fb868 | 759 | params = nla_data(nfula[NFULA_CFG_MODE]); |
0597f268 | 760 | |
c0506365 PM |
761 | if (!inst) { |
762 | ret = -ENODEV; | |
763 | goto out; | |
764 | } | |
0597f268 | 765 | nfulnl_set_mode(inst, params->copy_mode, |
d1208b99 | 766 | ntohl(params->copy_range)); |
0597f268 HW |
767 | } |
768 | ||
df6fb868 | 769 | if (nfula[NFULA_CFG_TIMEOUT]) { |
0dfedd28 | 770 | __be32 timeout = nla_get_be32(nfula[NFULA_CFG_TIMEOUT]); |
0597f268 | 771 | |
c0506365 PM |
772 | if (!inst) { |
773 | ret = -ENODEV; | |
774 | goto out; | |
775 | } | |
0597f268 HW |
776 | nfulnl_set_timeout(inst, ntohl(timeout)); |
777 | } | |
778 | ||
df6fb868 | 779 | if (nfula[NFULA_CFG_NLBUFSIZ]) { |
0dfedd28 | 780 | __be32 nlbufsiz = nla_get_be32(nfula[NFULA_CFG_NLBUFSIZ]); |
0597f268 | 781 | |
c0506365 PM |
782 | if (!inst) { |
783 | ret = -ENODEV; | |
784 | goto out; | |
785 | } | |
0597f268 HW |
786 | nfulnl_set_nlbufsiz(inst, ntohl(nlbufsiz)); |
787 | } | |
788 | ||
df6fb868 | 789 | if (nfula[NFULA_CFG_QTHRESH]) { |
0dfedd28 | 790 | __be32 qthresh = nla_get_be32(nfula[NFULA_CFG_QTHRESH]); |
0597f268 | 791 | |
c0506365 PM |
792 | if (!inst) { |
793 | ret = -ENODEV; | |
794 | goto out; | |
795 | } | |
0597f268 HW |
796 | nfulnl_set_qthresh(inst, ntohl(qthresh)); |
797 | } | |
798 | ||
df6fb868 | 799 | if (nfula[NFULA_CFG_FLAGS]) { |
0dfedd28 | 800 | __be16 flags = nla_get_be16(nfula[NFULA_CFG_FLAGS]); |
c0506365 PM |
801 | |
802 | if (!inst) { | |
803 | ret = -ENODEV; | |
804 | goto out; | |
805 | } | |
ee433530 | 806 | nfulnl_set_flags(inst, ntohs(flags)); |
0af5f6c1 HW |
807 | } |
808 | ||
0597f268 HW |
809 | out_put: |
810 | instance_put(inst); | |
dd16704e | 811 | out: |
0597f268 HW |
812 | return ret; |
813 | } | |
814 | ||
7c8d4cb4 | 815 | static const struct nfnl_callback nfulnl_cb[NFULNL_MSG_MAX] = { |
0597f268 | 816 | [NFULNL_MSG_PACKET] = { .call = nfulnl_recv_unsupp, |
37d2e7a2 | 817 | .attr_count = NFULA_MAX, }, |
0597f268 | 818 | [NFULNL_MSG_CONFIG] = { .call = nfulnl_recv_config, |
fd8281ad PM |
819 | .attr_count = NFULA_CFG_MAX, |
820 | .policy = nfula_cfg_policy }, | |
0597f268 HW |
821 | }; |
822 | ||
7c8d4cb4 | 823 | static const struct nfnetlink_subsystem nfulnl_subsys = { |
0597f268 HW |
824 | .name = "log", |
825 | .subsys_id = NFNL_SUBSYS_ULOG, | |
826 | .cb_count = NFULNL_MSG_MAX, | |
0597f268 HW |
827 | .cb = nfulnl_cb, |
828 | }; | |
829 | ||
830 | #ifdef CONFIG_PROC_FS | |
831 | struct iter_state { | |
832 | unsigned int bucket; | |
833 | }; | |
834 | ||
f76cdcee | 835 | static struct hlist_node *get_first(struct iter_state *st) |
0597f268 | 836 | { |
0597f268 HW |
837 | if (!st) |
838 | return NULL; | |
839 | ||
840 | for (st->bucket = 0; st->bucket < INSTANCE_BUCKETS; st->bucket++) { | |
841 | if (!hlist_empty(&instance_table[st->bucket])) | |
842 | return instance_table[st->bucket].first; | |
843 | } | |
844 | return NULL; | |
845 | } | |
846 | ||
f76cdcee | 847 | static struct hlist_node *get_next(struct iter_state *st, struct hlist_node *h) |
0597f268 | 848 | { |
0597f268 HW |
849 | h = h->next; |
850 | while (!h) { | |
851 | if (++st->bucket >= INSTANCE_BUCKETS) | |
852 | return NULL; | |
853 | ||
854 | h = instance_table[st->bucket].first; | |
855 | } | |
856 | return h; | |
857 | } | |
858 | ||
f76cdcee | 859 | static struct hlist_node *get_idx(struct iter_state *st, loff_t pos) |
0597f268 HW |
860 | { |
861 | struct hlist_node *head; | |
f76cdcee | 862 | head = get_first(st); |
0597f268 HW |
863 | |
864 | if (head) | |
f76cdcee | 865 | while (pos && (head = get_next(st, head))) |
0597f268 HW |
866 | pos--; |
867 | return pos ? NULL : head; | |
868 | } | |
869 | ||
870 | static void *seq_start(struct seq_file *seq, loff_t *pos) | |
4e26fe26 | 871 | __acquires(instances_lock) |
0597f268 HW |
872 | { |
873 | read_lock_bh(&instances_lock); | |
f76cdcee | 874 | return get_idx(seq->private, *pos); |
0597f268 HW |
875 | } |
876 | ||
877 | static void *seq_next(struct seq_file *s, void *v, loff_t *pos) | |
878 | { | |
879 | (*pos)++; | |
f76cdcee | 880 | return get_next(s->private, v); |
0597f268 HW |
881 | } |
882 | ||
883 | static void seq_stop(struct seq_file *s, void *v) | |
4e26fe26 | 884 | __releases(instances_lock) |
0597f268 HW |
885 | { |
886 | read_unlock_bh(&instances_lock); | |
887 | } | |
888 | ||
889 | static int seq_show(struct seq_file *s, void *v) | |
890 | { | |
891 | const struct nfulnl_instance *inst = v; | |
892 | ||
601e68e1 | 893 | return seq_printf(s, "%5d %6d %5d %1d %5d %6d %2d\n", |
0597f268 | 894 | inst->group_num, |
601e68e1 | 895 | inst->peer_pid, inst->qlen, |
0597f268 HW |
896 | inst->copy_mode, inst->copy_range, |
897 | inst->flushtimeout, atomic_read(&inst->use)); | |
898 | } | |
899 | ||
56b3d975 | 900 | static const struct seq_operations nful_seq_ops = { |
0597f268 HW |
901 | .start = seq_start, |
902 | .next = seq_next, | |
903 | .stop = seq_stop, | |
904 | .show = seq_show, | |
905 | }; | |
906 | ||
907 | static int nful_open(struct inode *inode, struct file *file) | |
908 | { | |
e2da5913 PE |
909 | return seq_open_private(file, &nful_seq_ops, |
910 | sizeof(struct iter_state)); | |
0597f268 HW |
911 | } |
912 | ||
da7071d7 | 913 | static const struct file_operations nful_file_ops = { |
0597f268 HW |
914 | .owner = THIS_MODULE, |
915 | .open = nful_open, | |
916 | .read = seq_read, | |
917 | .llseek = seq_lseek, | |
918 | .release = seq_release_private, | |
919 | }; | |
920 | ||
921 | #endif /* PROC_FS */ | |
922 | ||
32292a7f | 923 | static int __init nfnetlink_log_init(void) |
0597f268 HW |
924 | { |
925 | int i, status = -ENOMEM; | |
926 | #ifdef CONFIG_PROC_FS | |
927 | struct proc_dir_entry *proc_nful; | |
928 | #endif | |
601e68e1 | 929 | |
0597f268 HW |
930 | for (i = 0; i < INSTANCE_BUCKETS; i++) |
931 | INIT_HLIST_HEAD(&instance_table[i]); | |
601e68e1 | 932 | |
0597f268 HW |
933 | /* it's not really all that important to have a random value, so |
934 | * we can do this from the init function, even if there hasn't | |
935 | * been that much entropy yet */ | |
936 | get_random_bytes(&hash_init, sizeof(hash_init)); | |
937 | ||
938 | netlink_register_notifier(&nfulnl_rtnl_notifier); | |
939 | status = nfnetlink_subsys_register(&nfulnl_subsys); | |
940 | if (status < 0) { | |
941 | printk(KERN_ERR "log: failed to create netlink socket\n"); | |
942 | goto cleanup_netlink_notifier; | |
943 | } | |
944 | ||
945 | #ifdef CONFIG_PROC_FS | |
946 | proc_nful = create_proc_entry("nfnetlink_log", 0440, | |
947 | proc_net_netfilter); | |
948 | if (!proc_nful) | |
949 | goto cleanup_subsys; | |
950 | proc_nful->proc_fops = &nful_file_ops; | |
951 | #endif | |
0597f268 HW |
952 | return status; |
953 | ||
0597f268 | 954 | #ifdef CONFIG_PROC_FS |
0597f268 | 955 | cleanup_subsys: |
0597f268 | 956 | nfnetlink_subsys_unregister(&nfulnl_subsys); |
32292a7f | 957 | #endif |
0597f268 HW |
958 | cleanup_netlink_notifier: |
959 | netlink_unregister_notifier(&nfulnl_rtnl_notifier); | |
960 | return status; | |
961 | } | |
962 | ||
65b4b4e8 | 963 | static void __exit nfnetlink_log_fini(void) |
0597f268 | 964 | { |
e92ad99c | 965 | nf_log_unregister(&nfulnl_logger); |
32292a7f PM |
966 | #ifdef CONFIG_PROC_FS |
967 | remove_proc_entry("nfnetlink_log", proc_net_netfilter); | |
968 | #endif | |
969 | nfnetlink_subsys_unregister(&nfulnl_subsys); | |
970 | netlink_unregister_notifier(&nfulnl_rtnl_notifier); | |
0597f268 HW |
971 | } |
972 | ||
973 | MODULE_DESCRIPTION("netfilter userspace logging"); | |
974 | MODULE_AUTHOR("Harald Welte <laforge@netfilter.org>"); | |
975 | MODULE_LICENSE("GPL"); | |
f682faef | 976 | MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_ULOG); |
0597f268 | 977 | |
65b4b4e8 AM |
978 | module_init(nfnetlink_log_init); |
979 | module_exit(nfnetlink_log_fini); |