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 | 361 | unsigned int data_len, |
76108cea | 362 | u_int8_t pf, |
0597f268 HW |
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 | ||
72961ecf EL |
456 | if (indev && skb_mac_header_was_set(skb)) { |
457 | NLA_PUT_BE16(inst->skb, NFULA_HWTYPE, htons(skb->dev->type)); | |
458 | NLA_PUT_BE16(inst->skb, NFULA_HWLEN, | |
459 | htons(skb->dev->hard_header_len)); | |
460 | NLA_PUT(inst->skb, NFULA_HWHEADER, skb->dev->hard_header_len, | |
461 | skb_mac_header(skb)); | |
462 | } | |
463 | ||
b7aa0bf7 | 464 | if (skb->tstamp.tv64) { |
0597f268 | 465 | struct nfulnl_msg_packet_timestamp ts; |
b7aa0bf7 ED |
466 | struct timeval tv = ktime_to_timeval(skb->tstamp); |
467 | ts.sec = cpu_to_be64(tv.tv_sec); | |
468 | ts.usec = cpu_to_be64(tv.tv_usec); | |
0597f268 | 469 | |
df6fb868 | 470 | NLA_PUT(inst->skb, NFULA_TIMESTAMP, sizeof(ts), &ts); |
0597f268 HW |
471 | } |
472 | ||
473 | /* UID */ | |
474 | if (skb->sk) { | |
475 | read_lock_bh(&skb->sk->sk_callback_lock); | |
476 | if (skb->sk->sk_socket && skb->sk->sk_socket->file) { | |
d76b0d9b DH |
477 | struct file *file = skb->sk->sk_socket->file; |
478 | __be32 uid = htonl(file->f_cred->fsuid); | |
479 | __be32 gid = htonl(file->f_cred->fsgid); | |
df6fb868 | 480 | /* need to unlock here since NLA_PUT may goto */ |
0597f268 | 481 | read_unlock_bh(&skb->sk->sk_callback_lock); |
0dfedd28 | 482 | NLA_PUT_BE32(inst->skb, NFULA_UID, uid); |
76aa1ce1 | 483 | NLA_PUT_BE32(inst->skb, NFULA_GID, gid); |
0597f268 HW |
484 | } else |
485 | read_unlock_bh(&skb->sk->sk_callback_lock); | |
486 | } | |
487 | ||
0af5f6c1 | 488 | /* local sequence number */ |
0dfedd28 PM |
489 | if (inst->flags & NFULNL_CFG_F_SEQ) |
490 | NLA_PUT_BE32(inst->skb, NFULA_SEQ, htonl(inst->seq++)); | |
491 | ||
0af5f6c1 | 492 | /* global sequence number */ |
0dfedd28 PM |
493 | if (inst->flags & NFULNL_CFG_F_SEQ_GLOBAL) |
494 | NLA_PUT_BE32(inst->skb, NFULA_SEQ_GLOBAL, | |
495 | htonl(atomic_inc_return(&global_seq))); | |
0af5f6c1 | 496 | |
0597f268 | 497 | if (data_len) { |
df6fb868 PM |
498 | struct nlattr *nla; |
499 | int size = nla_attr_size(data_len); | |
0597f268 | 500 | |
df6fb868 | 501 | if (skb_tailroom(inst->skb) < nla_total_size(data_len)) { |
0597f268 HW |
502 | printk(KERN_WARNING "nfnetlink_log: no tailroom!\n"); |
503 | goto nlmsg_failure; | |
504 | } | |
505 | ||
df6fb868 PM |
506 | nla = (struct nlattr *)skb_put(inst->skb, nla_total_size(data_len)); |
507 | nla->nla_type = NFULA_PAYLOAD; | |
508 | nla->nla_len = size; | |
0597f268 | 509 | |
df6fb868 | 510 | if (skb_copy_bits(skb, 0, nla_data(nla), data_len)) |
0597f268 HW |
511 | BUG(); |
512 | } | |
601e68e1 | 513 | |
0597f268 HW |
514 | nlh->nlmsg_len = inst->skb->tail - old_tail; |
515 | return 0; | |
516 | ||
517 | nlmsg_failure: | |
df6fb868 | 518 | nla_put_failure: |
0597f268 HW |
519 | PRINTR(KERN_ERR "nfnetlink_log: error creating log nlmsg\n"); |
520 | return -1; | |
521 | } | |
522 | ||
523 | #define RCV_SKB_FAIL(err) do { netlink_ack(skb, nlh, (err)); return; } while (0) | |
524 | ||
525 | static struct nf_loginfo default_loginfo = { | |
526 | .type = NF_LOG_TYPE_ULOG, | |
527 | .u = { | |
528 | .ulog = { | |
529 | .copy_len = 0xffff, | |
530 | .group = 0, | |
531 | .qthreshold = 1, | |
532 | }, | |
533 | }, | |
534 | }; | |
535 | ||
536 | /* log handler for internal netfilter logging api */ | |
537 | static void | |
76108cea | 538 | nfulnl_log_packet(u_int8_t pf, |
0597f268 HW |
539 | unsigned int hooknum, |
540 | const struct sk_buff *skb, | |
541 | const struct net_device *in, | |
542 | const struct net_device *out, | |
543 | const struct nf_loginfo *li_user, | |
544 | const char *prefix) | |
545 | { | |
546 | unsigned int size, data_len; | |
547 | struct nfulnl_instance *inst; | |
548 | const struct nf_loginfo *li; | |
549 | unsigned int qthreshold; | |
d7a5c324 | 550 | unsigned int plen; |
0597f268 | 551 | |
601e68e1 | 552 | if (li_user && li_user->type == NF_LOG_TYPE_ULOG) |
0597f268 HW |
553 | li = li_user; |
554 | else | |
555 | li = &default_loginfo; | |
556 | ||
557 | inst = instance_lookup_get(li->u.ulog.group); | |
558 | if (!inst) | |
0597f268 | 559 | return; |
0597f268 | 560 | |
d7a5c324 PM |
561 | plen = 0; |
562 | if (prefix) | |
881dbfe8 | 563 | plen = strlen(prefix) + 1; |
d7a5c324 | 564 | |
0597f268 HW |
565 | /* FIXME: do we want to make the size calculation conditional based on |
566 | * what is actually present? way more branches and checks, but more | |
567 | * memory efficient... */ | |
7000d38d | 568 | size = NLMSG_SPACE(sizeof(struct nfgenmsg)) |
df6fb868 PM |
569 | + nla_total_size(sizeof(struct nfulnl_msg_packet_hdr)) |
570 | + nla_total_size(sizeof(u_int32_t)) /* ifindex */ | |
571 | + nla_total_size(sizeof(u_int32_t)) /* ifindex */ | |
fbcd923c | 572 | #ifdef CONFIG_BRIDGE_NETFILTER |
df6fb868 PM |
573 | + nla_total_size(sizeof(u_int32_t)) /* ifindex */ |
574 | + nla_total_size(sizeof(u_int32_t)) /* ifindex */ | |
fbcd923c | 575 | #endif |
df6fb868 PM |
576 | + nla_total_size(sizeof(u_int32_t)) /* mark */ |
577 | + nla_total_size(sizeof(u_int32_t)) /* uid */ | |
76aa1ce1 | 578 | + nla_total_size(sizeof(u_int32_t)) /* gid */ |
df6fb868 PM |
579 | + nla_total_size(plen) /* prefix */ |
580 | + nla_total_size(sizeof(struct nfulnl_msg_packet_hw)) | |
581 | + nla_total_size(sizeof(struct nfulnl_msg_packet_timestamp)); | |
0597f268 | 582 | |
0597f268 HW |
583 | spin_lock_bh(&inst->lock); |
584 | ||
0af5f6c1 | 585 | if (inst->flags & NFULNL_CFG_F_SEQ) |
df6fb868 | 586 | size += nla_total_size(sizeof(u_int32_t)); |
0af5f6c1 | 587 | if (inst->flags & NFULNL_CFG_F_SEQ_GLOBAL) |
df6fb868 | 588 | size += nla_total_size(sizeof(u_int32_t)); |
0af5f6c1 | 589 | |
0597f268 HW |
590 | qthreshold = inst->qthreshold; |
591 | /* per-rule qthreshold overrides per-instance */ | |
592 | if (qthreshold > li->u.ulog.qthreshold) | |
593 | qthreshold = li->u.ulog.qthreshold; | |
601e68e1 | 594 | |
0597f268 HW |
595 | switch (inst->copy_mode) { |
596 | case NFULNL_COPY_META: | |
597 | case NFULNL_COPY_NONE: | |
598 | data_len = 0; | |
599 | break; | |
601e68e1 | 600 | |
0597f268 | 601 | case NFULNL_COPY_PACKET: |
601e68e1 | 602 | if (inst->copy_range == 0 |
0597f268 HW |
603 | || inst->copy_range > skb->len) |
604 | data_len = skb->len; | |
605 | else | |
606 | data_len = inst->copy_range; | |
601e68e1 | 607 | |
df6fb868 | 608 | size += nla_total_size(data_len); |
0597f268 | 609 | break; |
601e68e1 | 610 | |
0597f268 | 611 | default: |
55b5a91e | 612 | goto unlock_and_release; |
0597f268 HW |
613 | } |
614 | ||
d63b043d MM |
615 | if (inst->skb && |
616 | size > skb_tailroom(inst->skb) - sizeof(struct nfgenmsg)) { | |
0597f268 HW |
617 | /* either the queue len is too high or we don't have |
618 | * enough room in the skb left. flush to userspace. */ | |
e3567061 | 619 | __nfulnl_flush(inst); |
55b5a91e | 620 | } |
0597f268 | 621 | |
55b5a91e MM |
622 | if (!inst->skb) { |
623 | inst->skb = nfulnl_alloc_skb(inst->nlbufsiz, size); | |
624 | if (!inst->skb) | |
0597f268 | 625 | goto alloc_failure; |
0597f268 HW |
626 | } |
627 | ||
0597f268 HW |
628 | inst->qlen++; |
629 | ||
630 | __build_packet_message(inst, skb, data_len, pf, | |
d7a5c324 | 631 | hooknum, in, out, li, prefix, plen); |
0597f268 | 632 | |
d63b043d MM |
633 | if (inst->qlen >= qthreshold) |
634 | __nfulnl_flush(inst); | |
0597f268 HW |
635 | /* timer_pending always called within inst->lock, so there |
636 | * is no chance of a race here */ | |
d63b043d | 637 | else if (!timer_pending(&inst->timer)) { |
0597f268 HW |
638 | instance_get(inst); |
639 | inst->timer.expires = jiffies + (inst->flushtimeout*HZ/100); | |
640 | add_timer(&inst->timer); | |
641 | } | |
0597f268 | 642 | |
ed32abea MM |
643 | unlock_and_release: |
644 | spin_unlock_bh(&inst->lock); | |
645 | instance_put(inst); | |
0597f268 HW |
646 | return; |
647 | ||
648 | alloc_failure: | |
0597f268 | 649 | /* FIXME: statistics */ |
ed32abea | 650 | goto unlock_and_release; |
0597f268 HW |
651 | } |
652 | ||
653 | static int | |
654 | nfulnl_rcv_nl_event(struct notifier_block *this, | |
655 | unsigned long event, void *ptr) | |
656 | { | |
657 | struct netlink_notify *n = ptr; | |
658 | ||
659 | if (event == NETLINK_URELEASE && | |
660 | n->protocol == NETLINK_NETFILTER && n->pid) { | |
661 | int i; | |
662 | ||
663 | /* destroy all instances for this pid */ | |
664 | write_lock_bh(&instances_lock); | |
665 | for (i = 0; i < INSTANCE_BUCKETS; i++) { | |
666 | struct hlist_node *tmp, *t2; | |
667 | struct nfulnl_instance *inst; | |
668 | struct hlist_head *head = &instance_table[i]; | |
669 | ||
670 | hlist_for_each_entry_safe(inst, tmp, t2, head, hlist) { | |
b4b51029 EB |
671 | if ((n->net == &init_net) && |
672 | (n->pid == inst->peer_pid)) | |
0597f268 HW |
673 | __instance_destroy(inst); |
674 | } | |
675 | } | |
676 | write_unlock_bh(&instances_lock); | |
677 | } | |
678 | return NOTIFY_DONE; | |
679 | } | |
680 | ||
681 | static struct notifier_block nfulnl_rtnl_notifier = { | |
682 | .notifier_call = nfulnl_rcv_nl_event, | |
683 | }; | |
684 | ||
685 | static int | |
686 | nfulnl_recv_unsupp(struct sock *ctnl, struct sk_buff *skb, | |
df6fb868 | 687 | struct nlmsghdr *nlh, struct nlattr *nfqa[]) |
0597f268 HW |
688 | { |
689 | return -ENOTSUPP; | |
690 | } | |
691 | ||
7b2f9631 | 692 | static const struct nf_logger nfulnl_logger = { |
0597f268 HW |
693 | .name = "nfnetlink_log", |
694 | .logfn = &nfulnl_log_packet, | |
695 | .me = THIS_MODULE, | |
696 | }; | |
697 | ||
fd8281ad PM |
698 | static const struct nla_policy nfula_cfg_policy[NFULA_CFG_MAX+1] = { |
699 | [NFULA_CFG_CMD] = { .len = sizeof(struct nfulnl_msg_config_cmd) }, | |
700 | [NFULA_CFG_MODE] = { .len = sizeof(struct nfulnl_msg_config_mode) }, | |
701 | [NFULA_CFG_TIMEOUT] = { .type = NLA_U32 }, | |
702 | [NFULA_CFG_QTHRESH] = { .type = NLA_U32 }, | |
703 | [NFULA_CFG_NLBUFSIZ] = { .type = NLA_U32 }, | |
704 | [NFULA_CFG_FLAGS] = { .type = NLA_U16 }, | |
0597f268 HW |
705 | }; |
706 | ||
707 | static int | |
708 | nfulnl_recv_config(struct sock *ctnl, struct sk_buff *skb, | |
df6fb868 | 709 | struct nlmsghdr *nlh, struct nlattr *nfula[]) |
0597f268 HW |
710 | { |
711 | struct nfgenmsg *nfmsg = NLMSG_DATA(nlh); | |
712 | u_int16_t group_num = ntohs(nfmsg->res_id); | |
713 | struct nfulnl_instance *inst; | |
b7047a1c | 714 | struct nfulnl_msg_config_cmd *cmd = NULL; |
0597f268 HW |
715 | int ret = 0; |
716 | ||
b7047a1c PM |
717 | if (nfula[NFULA_CFG_CMD]) { |
718 | u_int8_t pf = nfmsg->nfgen_family; | |
719 | cmd = nla_data(nfula[NFULA_CFG_CMD]); | |
720 | ||
721 | /* Commands without queue context */ | |
722 | switch (cmd->command) { | |
723 | case NFULNL_CFG_CMD_PF_BIND: | |
724 | return nf_log_register(pf, &nfulnl_logger); | |
725 | case NFULNL_CFG_CMD_PF_UNBIND: | |
726 | nf_log_unregister_pf(pf); | |
727 | return 0; | |
728 | } | |
729 | } | |
730 | ||
0597f268 | 731 | inst = instance_lookup_get(group_num); |
c0506365 PM |
732 | if (inst && inst->peer_pid != NETLINK_CB(skb).pid) { |
733 | ret = -EPERM; | |
734 | goto out_put; | |
735 | } | |
736 | ||
b7047a1c | 737 | if (cmd != NULL) { |
0597f268 HW |
738 | switch (cmd->command) { |
739 | case NFULNL_CFG_CMD_BIND: | |
740 | if (inst) { | |
741 | ret = -EBUSY; | |
742 | goto out_put; | |
743 | } | |
744 | ||
745 | inst = instance_create(group_num, | |
746 | NETLINK_CB(skb).pid); | |
baab2ce7 PM |
747 | if (IS_ERR(inst)) { |
748 | ret = PTR_ERR(inst); | |
f414c16c | 749 | goto out; |
0597f268 HW |
750 | } |
751 | break; | |
752 | case NFULNL_CFG_CMD_UNBIND: | |
753 | if (!inst) { | |
754 | ret = -ENODEV; | |
f414c16c | 755 | goto out; |
0597f268 HW |
756 | } |
757 | ||
0597f268 | 758 | instance_destroy(inst); |
9a36e8c2 | 759 | goto out; |
0597f268 | 760 | default: |
cd21f0ac | 761 | ret = -ENOTSUPP; |
0597f268 HW |
762 | break; |
763 | } | |
0597f268 HW |
764 | } |
765 | ||
df6fb868 | 766 | if (nfula[NFULA_CFG_MODE]) { |
0597f268 | 767 | struct nfulnl_msg_config_mode *params; |
df6fb868 | 768 | params = nla_data(nfula[NFULA_CFG_MODE]); |
0597f268 | 769 | |
c0506365 PM |
770 | if (!inst) { |
771 | ret = -ENODEV; | |
772 | goto out; | |
773 | } | |
0597f268 | 774 | nfulnl_set_mode(inst, params->copy_mode, |
d1208b99 | 775 | ntohl(params->copy_range)); |
0597f268 HW |
776 | } |
777 | ||
df6fb868 | 778 | if (nfula[NFULA_CFG_TIMEOUT]) { |
0dfedd28 | 779 | __be32 timeout = nla_get_be32(nfula[NFULA_CFG_TIMEOUT]); |
0597f268 | 780 | |
c0506365 PM |
781 | if (!inst) { |
782 | ret = -ENODEV; | |
783 | goto out; | |
784 | } | |
0597f268 HW |
785 | nfulnl_set_timeout(inst, ntohl(timeout)); |
786 | } | |
787 | ||
df6fb868 | 788 | if (nfula[NFULA_CFG_NLBUFSIZ]) { |
0dfedd28 | 789 | __be32 nlbufsiz = nla_get_be32(nfula[NFULA_CFG_NLBUFSIZ]); |
0597f268 | 790 | |
c0506365 PM |
791 | if (!inst) { |
792 | ret = -ENODEV; | |
793 | goto out; | |
794 | } | |
0597f268 HW |
795 | nfulnl_set_nlbufsiz(inst, ntohl(nlbufsiz)); |
796 | } | |
797 | ||
df6fb868 | 798 | if (nfula[NFULA_CFG_QTHRESH]) { |
0dfedd28 | 799 | __be32 qthresh = nla_get_be32(nfula[NFULA_CFG_QTHRESH]); |
0597f268 | 800 | |
c0506365 PM |
801 | if (!inst) { |
802 | ret = -ENODEV; | |
803 | goto out; | |
804 | } | |
0597f268 HW |
805 | nfulnl_set_qthresh(inst, ntohl(qthresh)); |
806 | } | |
807 | ||
df6fb868 | 808 | if (nfula[NFULA_CFG_FLAGS]) { |
0dfedd28 | 809 | __be16 flags = nla_get_be16(nfula[NFULA_CFG_FLAGS]); |
c0506365 PM |
810 | |
811 | if (!inst) { | |
812 | ret = -ENODEV; | |
813 | goto out; | |
814 | } | |
ee433530 | 815 | nfulnl_set_flags(inst, ntohs(flags)); |
0af5f6c1 HW |
816 | } |
817 | ||
0597f268 HW |
818 | out_put: |
819 | instance_put(inst); | |
dd16704e | 820 | out: |
0597f268 HW |
821 | return ret; |
822 | } | |
823 | ||
7c8d4cb4 | 824 | static const struct nfnl_callback nfulnl_cb[NFULNL_MSG_MAX] = { |
0597f268 | 825 | [NFULNL_MSG_PACKET] = { .call = nfulnl_recv_unsupp, |
37d2e7a2 | 826 | .attr_count = NFULA_MAX, }, |
0597f268 | 827 | [NFULNL_MSG_CONFIG] = { .call = nfulnl_recv_config, |
fd8281ad PM |
828 | .attr_count = NFULA_CFG_MAX, |
829 | .policy = nfula_cfg_policy }, | |
0597f268 HW |
830 | }; |
831 | ||
7c8d4cb4 | 832 | static const struct nfnetlink_subsystem nfulnl_subsys = { |
0597f268 HW |
833 | .name = "log", |
834 | .subsys_id = NFNL_SUBSYS_ULOG, | |
835 | .cb_count = NFULNL_MSG_MAX, | |
0597f268 HW |
836 | .cb = nfulnl_cb, |
837 | }; | |
838 | ||
839 | #ifdef CONFIG_PROC_FS | |
840 | struct iter_state { | |
841 | unsigned int bucket; | |
842 | }; | |
843 | ||
f76cdcee | 844 | static struct hlist_node *get_first(struct iter_state *st) |
0597f268 | 845 | { |
0597f268 HW |
846 | if (!st) |
847 | return NULL; | |
848 | ||
849 | for (st->bucket = 0; st->bucket < INSTANCE_BUCKETS; st->bucket++) { | |
850 | if (!hlist_empty(&instance_table[st->bucket])) | |
851 | return instance_table[st->bucket].first; | |
852 | } | |
853 | return NULL; | |
854 | } | |
855 | ||
f76cdcee | 856 | static struct hlist_node *get_next(struct iter_state *st, struct hlist_node *h) |
0597f268 | 857 | { |
0597f268 HW |
858 | h = h->next; |
859 | while (!h) { | |
860 | if (++st->bucket >= INSTANCE_BUCKETS) | |
861 | return NULL; | |
862 | ||
863 | h = instance_table[st->bucket].first; | |
864 | } | |
865 | return h; | |
866 | } | |
867 | ||
f76cdcee | 868 | static struct hlist_node *get_idx(struct iter_state *st, loff_t pos) |
0597f268 HW |
869 | { |
870 | struct hlist_node *head; | |
f76cdcee | 871 | head = get_first(st); |
0597f268 HW |
872 | |
873 | if (head) | |
f76cdcee | 874 | while (pos && (head = get_next(st, head))) |
0597f268 HW |
875 | pos--; |
876 | return pos ? NULL : head; | |
877 | } | |
878 | ||
879 | static void *seq_start(struct seq_file *seq, loff_t *pos) | |
4e26fe26 | 880 | __acquires(instances_lock) |
0597f268 HW |
881 | { |
882 | read_lock_bh(&instances_lock); | |
f76cdcee | 883 | return get_idx(seq->private, *pos); |
0597f268 HW |
884 | } |
885 | ||
886 | static void *seq_next(struct seq_file *s, void *v, loff_t *pos) | |
887 | { | |
888 | (*pos)++; | |
f76cdcee | 889 | return get_next(s->private, v); |
0597f268 HW |
890 | } |
891 | ||
892 | static void seq_stop(struct seq_file *s, void *v) | |
4e26fe26 | 893 | __releases(instances_lock) |
0597f268 HW |
894 | { |
895 | read_unlock_bh(&instances_lock); | |
896 | } | |
897 | ||
898 | static int seq_show(struct seq_file *s, void *v) | |
899 | { | |
900 | const struct nfulnl_instance *inst = v; | |
901 | ||
601e68e1 | 902 | return seq_printf(s, "%5d %6d %5d %1d %5d %6d %2d\n", |
0597f268 | 903 | inst->group_num, |
601e68e1 | 904 | inst->peer_pid, inst->qlen, |
0597f268 HW |
905 | inst->copy_mode, inst->copy_range, |
906 | inst->flushtimeout, atomic_read(&inst->use)); | |
907 | } | |
908 | ||
56b3d975 | 909 | static const struct seq_operations nful_seq_ops = { |
0597f268 HW |
910 | .start = seq_start, |
911 | .next = seq_next, | |
912 | .stop = seq_stop, | |
913 | .show = seq_show, | |
914 | }; | |
915 | ||
916 | static int nful_open(struct inode *inode, struct file *file) | |
917 | { | |
e2da5913 PE |
918 | return seq_open_private(file, &nful_seq_ops, |
919 | sizeof(struct iter_state)); | |
0597f268 HW |
920 | } |
921 | ||
da7071d7 | 922 | static const struct file_operations nful_file_ops = { |
0597f268 HW |
923 | .owner = THIS_MODULE, |
924 | .open = nful_open, | |
925 | .read = seq_read, | |
926 | .llseek = seq_lseek, | |
927 | .release = seq_release_private, | |
928 | }; | |
929 | ||
930 | #endif /* PROC_FS */ | |
931 | ||
32292a7f | 932 | static int __init nfnetlink_log_init(void) |
0597f268 HW |
933 | { |
934 | int i, status = -ENOMEM; | |
601e68e1 | 935 | |
0597f268 HW |
936 | for (i = 0; i < INSTANCE_BUCKETS; i++) |
937 | INIT_HLIST_HEAD(&instance_table[i]); | |
601e68e1 | 938 | |
0597f268 HW |
939 | /* it's not really all that important to have a random value, so |
940 | * we can do this from the init function, even if there hasn't | |
941 | * been that much entropy yet */ | |
942 | get_random_bytes(&hash_init, sizeof(hash_init)); | |
943 | ||
944 | netlink_register_notifier(&nfulnl_rtnl_notifier); | |
945 | status = nfnetlink_subsys_register(&nfulnl_subsys); | |
946 | if (status < 0) { | |
947 | printk(KERN_ERR "log: failed to create netlink socket\n"); | |
948 | goto cleanup_netlink_notifier; | |
949 | } | |
950 | ||
951 | #ifdef CONFIG_PROC_FS | |
8eeee8b1 DL |
952 | if (!proc_create("nfnetlink_log", 0440, |
953 | proc_net_netfilter, &nful_file_ops)) | |
0597f268 | 954 | goto cleanup_subsys; |
0597f268 | 955 | #endif |
0597f268 HW |
956 | return status; |
957 | ||
0597f268 | 958 | #ifdef CONFIG_PROC_FS |
0597f268 | 959 | cleanup_subsys: |
0597f268 | 960 | nfnetlink_subsys_unregister(&nfulnl_subsys); |
32292a7f | 961 | #endif |
0597f268 HW |
962 | cleanup_netlink_notifier: |
963 | netlink_unregister_notifier(&nfulnl_rtnl_notifier); | |
964 | return status; | |
965 | } | |
966 | ||
65b4b4e8 | 967 | static void __exit nfnetlink_log_fini(void) |
0597f268 | 968 | { |
e92ad99c | 969 | nf_log_unregister(&nfulnl_logger); |
32292a7f PM |
970 | #ifdef CONFIG_PROC_FS |
971 | remove_proc_entry("nfnetlink_log", proc_net_netfilter); | |
972 | #endif | |
973 | nfnetlink_subsys_unregister(&nfulnl_subsys); | |
974 | netlink_unregister_notifier(&nfulnl_rtnl_notifier); | |
0597f268 HW |
975 | } |
976 | ||
977 | MODULE_DESCRIPTION("netfilter userspace logging"); | |
978 | MODULE_AUTHOR("Harald Welte <laforge@netfilter.org>"); | |
979 | MODULE_LICENSE("GPL"); | |
f682faef | 980 | MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_ULOG); |
0597f268 | 981 | |
65b4b4e8 AM |
982 | module_init(nfnetlink_log_init); |
983 | module_exit(nfnetlink_log_fini); |