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> | |
f229f6ce | 6 | * (C) 2006-2012 Patrick McHardy <kaber@trash.net> |
0597f268 HW |
7 | * |
8 | * Based on the old ipv4-only ipt_ULOG.c: | |
9 | * (C) 2000-2004 by Harald Welte <laforge@netfilter.org> | |
10 | * | |
11 | * This program is free software; you can redistribute it and/or modify | |
12 | * it under the terms of the GNU General Public License version 2 as | |
13 | * published by the Free Software Foundation. | |
0597f268 HW |
14 | */ |
15 | #include <linux/module.h> | |
16 | #include <linux/skbuff.h> | |
e035edd1 | 17 | #include <linux/if_arp.h> |
0597f268 HW |
18 | #include <linux/init.h> |
19 | #include <linux/ip.h> | |
20 | #include <linux/ipv6.h> | |
21 | #include <linux/netdevice.h> | |
22 | #include <linux/netfilter.h> | |
573ce260 | 23 | #include <net/netlink.h> |
0597f268 HW |
24 | #include <linux/netfilter/nfnetlink.h> |
25 | #include <linux/netfilter/nfnetlink_log.h> | |
26 | #include <linux/spinlock.h> | |
27 | #include <linux/sysctl.h> | |
28 | #include <linux/proc_fs.h> | |
29 | #include <linux/security.h> | |
30 | #include <linux/list.h> | |
31 | #include <linux/jhash.h> | |
32 | #include <linux/random.h> | |
5a0e3ad6 | 33 | #include <linux/slab.h> |
0597f268 | 34 | #include <net/sock.h> |
f01ffbd6 | 35 | #include <net/netfilter/nf_log.h> |
9368a53c | 36 | #include <net/netns/generic.h> |
d9e15007 | 37 | #include <net/netfilter/nfnetlink_log.h> |
0597f268 | 38 | |
60063497 | 39 | #include <linux/atomic.h> |
0597f268 | 40 | |
fbcd923c HW |
41 | #ifdef CONFIG_BRIDGE_NETFILTER |
42 | #include "../bridge/br_private.h" | |
43 | #endif | |
44 | ||
c2db2924 | 45 | #define NFULNL_NLBUFSIZ_DEFAULT NLMSG_GOODSIZE |
2c6764b7 | 46 | #define NFULNL_TIMEOUT_DEFAULT 100 /* every second */ |
0597f268 | 47 | #define NFULNL_QTHRESH_DEFAULT 100 /* 100 packets */ |
6b6ec99a | 48 | #define NFULNL_COPY_RANGE_MAX 0xFFFF /* max packet size is limited by 16-bit struct nfattr nfa_len field */ |
0597f268 HW |
49 | |
50 | #define PRINTR(x, args...) do { if (net_ratelimit()) \ | |
51 | printk(x, ## args); } while (0); | |
52 | ||
0597f268 HW |
53 | struct nfulnl_instance { |
54 | struct hlist_node hlist; /* global list of instances */ | |
55 | spinlock_t lock; | |
56 | atomic_t use; /* use count */ | |
57 | ||
58 | unsigned int qlen; /* number of nlmsgs in skb */ | |
59 | struct sk_buff *skb; /* pre-allocatd skb */ | |
0597f268 | 60 | struct timer_list timer; |
9368a53c | 61 | struct net *net; |
9eea9515 | 62 | struct user_namespace *peer_user_ns; /* User namespace of the peer process */ |
15e47304 | 63 | int peer_portid; /* PORTID of the peer process */ |
0597f268 HW |
64 | |
65 | /* configurable parameters */ | |
66 | unsigned int flushtimeout; /* timeout until queue flush */ | |
67 | unsigned int nlbufsiz; /* netlink buffer allocation size */ | |
68 | unsigned int qthreshold; /* threshold of the queue */ | |
69 | u_int32_t copy_range; | |
0af5f6c1 | 70 | u_int32_t seq; /* instance-local sequential counter */ |
0597f268 | 71 | u_int16_t group_num; /* number of this queue */ |
0af5f6c1 | 72 | u_int16_t flags; |
601e68e1 | 73 | u_int8_t copy_mode; |
bed1be20 | 74 | struct rcu_head rcu; |
0597f268 HW |
75 | }; |
76 | ||
0597f268 | 77 | #define INSTANCE_BUCKETS 16 |
0597f268 HW |
78 | static unsigned int hash_init; |
79 | ||
9368a53c G |
80 | static int nfnl_log_net_id __read_mostly; |
81 | ||
82 | struct nfnl_log_net { | |
83 | spinlock_t instances_lock; | |
84 | struct hlist_head instance_table[INSTANCE_BUCKETS]; | |
85 | atomic_t global_seq; | |
86 | }; | |
87 | ||
88 | static struct nfnl_log_net *nfnl_log_pernet(struct net *net) | |
89 | { | |
90 | return net_generic(net, nfnl_log_net_id); | |
91 | } | |
92 | ||
0597f268 HW |
93 | static inline u_int8_t instance_hashfn(u_int16_t group_num) |
94 | { | |
95 | return ((group_num & 0xff) % INSTANCE_BUCKETS); | |
96 | } | |
97 | ||
98 | static struct nfulnl_instance * | |
9368a53c | 99 | __instance_lookup(struct nfnl_log_net *log, u_int16_t group_num) |
0597f268 HW |
100 | { |
101 | struct hlist_head *head; | |
0597f268 HW |
102 | struct nfulnl_instance *inst; |
103 | ||
9368a53c | 104 | head = &log->instance_table[instance_hashfn(group_num)]; |
b67bfe0d | 105 | hlist_for_each_entry_rcu(inst, head, hlist) { |
0597f268 HW |
106 | if (inst->group_num == group_num) |
107 | return inst; | |
108 | } | |
109 | return NULL; | |
110 | } | |
111 | ||
112 | static inline void | |
113 | instance_get(struct nfulnl_instance *inst) | |
114 | { | |
115 | atomic_inc(&inst->use); | |
116 | } | |
117 | ||
118 | static struct nfulnl_instance * | |
9368a53c | 119 | instance_lookup_get(struct nfnl_log_net *log, u_int16_t group_num) |
0597f268 HW |
120 | { |
121 | struct nfulnl_instance *inst; | |
122 | ||
bed1be20 | 123 | rcu_read_lock_bh(); |
9368a53c | 124 | inst = __instance_lookup(log, group_num); |
f5c5440d ED |
125 | if (inst && !atomic_inc_not_zero(&inst->use)) |
126 | inst = NULL; | |
bed1be20 | 127 | rcu_read_unlock_bh(); |
0597f268 HW |
128 | |
129 | return inst; | |
130 | } | |
131 | ||
bed1be20 ED |
132 | static void nfulnl_instance_free_rcu(struct rcu_head *head) |
133 | { | |
9368a53c G |
134 | struct nfulnl_instance *inst = |
135 | container_of(head, struct nfulnl_instance, rcu); | |
136 | ||
137 | put_net(inst->net); | |
138 | kfree(inst); | |
bed1be20 ED |
139 | module_put(THIS_MODULE); |
140 | } | |
141 | ||
0597f268 HW |
142 | static void |
143 | instance_put(struct nfulnl_instance *inst) | |
144 | { | |
bed1be20 ED |
145 | if (inst && atomic_dec_and_test(&inst->use)) |
146 | call_rcu_bh(&inst->rcu, nfulnl_instance_free_rcu); | |
0597f268 HW |
147 | } |
148 | ||
149 | static void nfulnl_timer(unsigned long data); | |
150 | ||
151 | static struct nfulnl_instance * | |
9368a53c G |
152 | instance_create(struct net *net, u_int16_t group_num, |
153 | int portid, struct user_namespace *user_ns) | |
0597f268 HW |
154 | { |
155 | struct nfulnl_instance *inst; | |
9368a53c | 156 | struct nfnl_log_net *log = nfnl_log_pernet(net); |
baab2ce7 | 157 | int err; |
0597f268 | 158 | |
9368a53c G |
159 | spin_lock_bh(&log->instances_lock); |
160 | if (__instance_lookup(log, group_num)) { | |
baab2ce7 | 161 | err = -EEXIST; |
0597f268 HW |
162 | goto out_unlock; |
163 | } | |
164 | ||
10dfdc69 | 165 | inst = kzalloc(sizeof(*inst), GFP_ATOMIC); |
baab2ce7 PM |
166 | if (!inst) { |
167 | err = -ENOMEM; | |
0597f268 | 168 | goto out_unlock; |
baab2ce7 | 169 | } |
0597f268 | 170 | |
aace57e0 MM |
171 | if (!try_module_get(THIS_MODULE)) { |
172 | kfree(inst); | |
baab2ce7 | 173 | err = -EAGAIN; |
aace57e0 MM |
174 | goto out_unlock; |
175 | } | |
176 | ||
0597f268 | 177 | INIT_HLIST_NODE(&inst->hlist); |
181a46a5 | 178 | spin_lock_init(&inst->lock); |
0597f268 HW |
179 | /* needs to be two, since we _put() after creation */ |
180 | atomic_set(&inst->use, 2); | |
181 | ||
e6f689db | 182 | setup_timer(&inst->timer, nfulnl_timer, (unsigned long)inst); |
0597f268 | 183 | |
9368a53c | 184 | inst->net = get_net(net); |
9eea9515 | 185 | inst->peer_user_ns = user_ns; |
15e47304 | 186 | inst->peer_portid = portid; |
0597f268 HW |
187 | inst->group_num = group_num; |
188 | ||
189 | inst->qthreshold = NFULNL_QTHRESH_DEFAULT; | |
190 | inst->flushtimeout = NFULNL_TIMEOUT_DEFAULT; | |
191 | inst->nlbufsiz = NFULNL_NLBUFSIZ_DEFAULT; | |
192 | inst->copy_mode = NFULNL_COPY_PACKET; | |
6b6ec99a | 193 | inst->copy_range = NFULNL_COPY_RANGE_MAX; |
0597f268 | 194 | |
f5c5440d | 195 | hlist_add_head_rcu(&inst->hlist, |
9368a53c G |
196 | &log->instance_table[instance_hashfn(group_num)]); |
197 | ||
0597f268 | 198 | |
9368a53c | 199 | spin_unlock_bh(&log->instances_lock); |
0597f268 HW |
200 | |
201 | return inst; | |
202 | ||
0597f268 | 203 | out_unlock: |
9368a53c | 204 | spin_unlock_bh(&log->instances_lock); |
baab2ce7 | 205 | return ERR_PTR(err); |
0597f268 HW |
206 | } |
207 | ||
e3567061 | 208 | static void __nfulnl_flush(struct nfulnl_instance *inst); |
0597f268 | 209 | |
f5c5440d | 210 | /* called with BH disabled */ |
0597f268 | 211 | static void |
9afdb00c | 212 | __instance_destroy(struct nfulnl_instance *inst) |
0597f268 HW |
213 | { |
214 | /* first pull it out of the global list */ | |
f5c5440d | 215 | hlist_del_rcu(&inst->hlist); |
0597f268 | 216 | |
0597f268 HW |
217 | /* then flush all pending packets from skb */ |
218 | ||
f5c5440d ED |
219 | spin_lock(&inst->lock); |
220 | ||
221 | /* lockless readers wont be able to use us */ | |
222 | inst->copy_mode = NFULNL_COPY_DISABLED; | |
223 | ||
e3567061 MM |
224 | if (inst->skb) |
225 | __nfulnl_flush(inst); | |
f5c5440d | 226 | spin_unlock(&inst->lock); |
0597f268 HW |
227 | |
228 | /* and finally put the refcount */ | |
229 | instance_put(inst); | |
0597f268 HW |
230 | } |
231 | ||
0597f268 | 232 | static inline void |
9368a53c G |
233 | instance_destroy(struct nfnl_log_net *log, |
234 | struct nfulnl_instance *inst) | |
0597f268 | 235 | { |
9368a53c | 236 | spin_lock_bh(&log->instances_lock); |
9afdb00c | 237 | __instance_destroy(inst); |
9368a53c | 238 | spin_unlock_bh(&log->instances_lock); |
0597f268 HW |
239 | } |
240 | ||
241 | static int | |
242 | nfulnl_set_mode(struct nfulnl_instance *inst, u_int8_t mode, | |
243 | unsigned int range) | |
244 | { | |
245 | int status = 0; | |
246 | ||
247 | spin_lock_bh(&inst->lock); | |
601e68e1 | 248 | |
0597f268 HW |
249 | switch (mode) { |
250 | case NFULNL_COPY_NONE: | |
251 | case NFULNL_COPY_META: | |
252 | inst->copy_mode = mode; | |
253 | inst->copy_range = 0; | |
254 | break; | |
601e68e1 | 255 | |
0597f268 HW |
256 | case NFULNL_COPY_PACKET: |
257 | inst->copy_mode = mode; | |
6b6ec99a MM |
258 | inst->copy_range = min_t(unsigned int, |
259 | range, NFULNL_COPY_RANGE_MAX); | |
0597f268 | 260 | break; |
601e68e1 | 261 | |
0597f268 HW |
262 | default: |
263 | status = -EINVAL; | |
264 | break; | |
265 | } | |
266 | ||
267 | spin_unlock_bh(&inst->lock); | |
268 | ||
269 | return status; | |
270 | } | |
271 | ||
272 | static int | |
273 | nfulnl_set_nlbufsiz(struct nfulnl_instance *inst, u_int32_t nlbufsiz) | |
274 | { | |
275 | int status; | |
276 | ||
277 | spin_lock_bh(&inst->lock); | |
278 | if (nlbufsiz < NFULNL_NLBUFSIZ_DEFAULT) | |
279 | status = -ERANGE; | |
280 | else if (nlbufsiz > 131072) | |
281 | status = -ERANGE; | |
282 | else { | |
283 | inst->nlbufsiz = nlbufsiz; | |
284 | status = 0; | |
285 | } | |
286 | spin_unlock_bh(&inst->lock); | |
287 | ||
288 | return status; | |
289 | } | |
290 | ||
291 | static int | |
292 | nfulnl_set_timeout(struct nfulnl_instance *inst, u_int32_t timeout) | |
293 | { | |
294 | spin_lock_bh(&inst->lock); | |
295 | inst->flushtimeout = timeout; | |
296 | spin_unlock_bh(&inst->lock); | |
297 | ||
298 | return 0; | |
299 | } | |
300 | ||
301 | static int | |
302 | nfulnl_set_qthresh(struct nfulnl_instance *inst, u_int32_t qthresh) | |
303 | { | |
304 | spin_lock_bh(&inst->lock); | |
305 | inst->qthreshold = qthresh; | |
306 | spin_unlock_bh(&inst->lock); | |
307 | ||
308 | return 0; | |
309 | } | |
310 | ||
0af5f6c1 HW |
311 | static int |
312 | nfulnl_set_flags(struct nfulnl_instance *inst, u_int16_t flags) | |
313 | { | |
314 | spin_lock_bh(&inst->lock); | |
ee433530 | 315 | inst->flags = flags; |
0af5f6c1 HW |
316 | spin_unlock_bh(&inst->lock); |
317 | ||
318 | return 0; | |
319 | } | |
320 | ||
c6a8f648 | 321 | static struct sk_buff * |
afff14f6 G |
322 | nfulnl_alloc_skb(struct net *net, u32 peer_portid, unsigned int inst_size, |
323 | unsigned int pkt_size) | |
0597f268 HW |
324 | { |
325 | struct sk_buff *skb; | |
ad2ad0f9 | 326 | unsigned int n; |
0597f268 | 327 | |
0597f268 HW |
328 | /* alloc skb which should be big enough for a whole multipart |
329 | * message. WARNING: has to be <= 128k due to slab restrictions */ | |
330 | ||
ad2ad0f9 | 331 | n = max(inst_size, pkt_size); |
afff14f6 | 332 | skb = nfnetlink_alloc_skb(net, n, peer_portid, GFP_ATOMIC); |
0597f268 | 333 | if (!skb) { |
ad2ad0f9 PM |
334 | if (n > pkt_size) { |
335 | /* try to allocate only as much as we need for current | |
336 | * packet */ | |
0597f268 | 337 | |
afff14f6 | 338 | skb = nfnetlink_alloc_skb(net, pkt_size, |
3ab1f683 | 339 | peer_portid, GFP_ATOMIC); |
ad2ad0f9 | 340 | if (!skb) |
0a9ee813 JP |
341 | pr_err("nfnetlink_log: can't even alloc %u bytes\n", |
342 | pkt_size); | |
ad2ad0f9 | 343 | } |
0597f268 HW |
344 | } |
345 | ||
346 | return skb; | |
347 | } | |
348 | ||
349 | static int | |
350 | __nfulnl_send(struct nfulnl_instance *inst) | |
351 | { | |
29c5d4af | 352 | int status = -1; |
0597f268 | 353 | |
d550d095 DM |
354 | if (inst->qlen > 1) { |
355 | struct nlmsghdr *nlh = nlmsg_put(inst->skb, 0, 0, | |
356 | NLMSG_DONE, | |
357 | sizeof(struct nfgenmsg), | |
358 | 0); | |
359 | if (!nlh) | |
360 | goto out; | |
361 | } | |
9368a53c | 362 | status = nfnetlink_unicast(inst->skb, inst->net, inst->peer_portid, |
cd8c20b6 | 363 | MSG_DONTWAIT); |
0597f268 HW |
364 | |
365 | inst->qlen = 0; | |
366 | inst->skb = NULL; | |
d550d095 | 367 | out: |
0597f268 HW |
368 | return status; |
369 | } | |
370 | ||
e3567061 MM |
371 | static void |
372 | __nfulnl_flush(struct nfulnl_instance *inst) | |
373 | { | |
374 | /* timer holds a reference */ | |
375 | if (del_timer(&inst->timer)) | |
376 | instance_put(inst); | |
377 | if (inst->skb) | |
378 | __nfulnl_send(inst); | |
379 | } | |
380 | ||
c6a8f648 MM |
381 | static void |
382 | nfulnl_timer(unsigned long data) | |
0597f268 | 383 | { |
601e68e1 | 384 | struct nfulnl_instance *inst = (struct nfulnl_instance *)data; |
0597f268 | 385 | |
0597f268 | 386 | spin_lock_bh(&inst->lock); |
370e6a87 MM |
387 | if (inst->skb) |
388 | __nfulnl_send(inst); | |
0597f268 | 389 | spin_unlock_bh(&inst->lock); |
05f7b7b3 | 390 | instance_put(inst); |
0597f268 HW |
391 | } |
392 | ||
0af5f6c1 HW |
393 | /* This is an inline function, we don't really care about a long |
394 | * list of arguments */ | |
601e68e1 | 395 | static inline int |
9368a53c G |
396 | __build_packet_message(struct nfnl_log_net *log, |
397 | struct nfulnl_instance *inst, | |
601e68e1 | 398 | const struct sk_buff *skb, |
0597f268 | 399 | unsigned int data_len, |
76108cea | 400 | u_int8_t pf, |
0597f268 HW |
401 | unsigned int hooknum, |
402 | const struct net_device *indev, | |
403 | const struct net_device *outdev, | |
d7a5c324 | 404 | const char *prefix, unsigned int plen) |
0597f268 | 405 | { |
0597f268 HW |
406 | struct nfulnl_msg_packet_hdr pmsg; |
407 | struct nlmsghdr *nlh; | |
408 | struct nfgenmsg *nfmsg; | |
27a884dc | 409 | sk_buff_data_t old_tail = inst->skb->tail; |
0626af31 | 410 | struct sock *sk; |
0c36b48b | 411 | const unsigned char *hwhdrp; |
0597f268 | 412 | |
d550d095 | 413 | nlh = nlmsg_put(inst->skb, 0, 0, |
0597f268 | 414 | NFNL_SUBSYS_ULOG << 8 | NFULNL_MSG_PACKET, |
d550d095 DM |
415 | sizeof(struct nfgenmsg), 0); |
416 | if (!nlh) | |
417 | return -1; | |
418 | nfmsg = nlmsg_data(nlh); | |
0597f268 HW |
419 | nfmsg->nfgen_family = pf; |
420 | nfmsg->version = NFNETLINK_V0; | |
421 | nfmsg->res_id = htons(inst->group_num); | |
422 | ||
e4d091d7 | 423 | memset(&pmsg, 0, sizeof(pmsg)); |
febf0a43 | 424 | pmsg.hw_protocol = skb->protocol; |
0597f268 HW |
425 | pmsg.hook = hooknum; |
426 | ||
1db20a52 DM |
427 | if (nla_put(inst->skb, NFULA_PACKET_HDR, sizeof(pmsg), &pmsg)) |
428 | goto nla_put_failure; | |
0597f268 | 429 | |
1db20a52 DM |
430 | if (prefix && |
431 | nla_put(inst->skb, NFULA_PREFIX, plen, prefix)) | |
432 | goto nla_put_failure; | |
0597f268 HW |
433 | |
434 | if (indev) { | |
fbcd923c | 435 | #ifndef CONFIG_BRIDGE_NETFILTER |
1db20a52 DM |
436 | if (nla_put_be32(inst->skb, NFULA_IFINDEX_INDEV, |
437 | htonl(indev->ifindex))) | |
438 | goto nla_put_failure; | |
fbcd923c HW |
439 | #else |
440 | if (pf == PF_BRIDGE) { | |
441 | /* Case 1: outdev is physical input device, we need to | |
442 | * look for bridge group (when called from | |
443 | * netfilter_bridge) */ | |
1db20a52 DM |
444 | if (nla_put_be32(inst->skb, NFULA_IFINDEX_PHYSINDEV, |
445 | htonl(indev->ifindex)) || | |
fbcd923c | 446 | /* this is the bridge group "brX" */ |
f350a0a8 | 447 | /* rcu_read_lock()ed by nf_hook_slow or nf_log_packet */ |
1db20a52 DM |
448 | nla_put_be32(inst->skb, NFULA_IFINDEX_INDEV, |
449 | htonl(br_port_get_rcu(indev)->br->dev->ifindex))) | |
450 | goto nla_put_failure; | |
fbcd923c HW |
451 | } else { |
452 | /* Case 2: indev is bridge group, we need to look for | |
453 | * physical device (when called from ipv4) */ | |
1db20a52 DM |
454 | if (nla_put_be32(inst->skb, NFULA_IFINDEX_INDEV, |
455 | htonl(indev->ifindex))) | |
456 | goto nla_put_failure; | |
457 | if (skb->nf_bridge && skb->nf_bridge->physindev && | |
458 | nla_put_be32(inst->skb, NFULA_IFINDEX_PHYSINDEV, | |
459 | htonl(skb->nf_bridge->physindev->ifindex))) | |
460 | goto nla_put_failure; | |
fbcd923c HW |
461 | } |
462 | #endif | |
0597f268 HW |
463 | } |
464 | ||
465 | if (outdev) { | |
fbcd923c | 466 | #ifndef CONFIG_BRIDGE_NETFILTER |
1db20a52 DM |
467 | if (nla_put_be32(inst->skb, NFULA_IFINDEX_OUTDEV, |
468 | htonl(outdev->ifindex))) | |
469 | goto nla_put_failure; | |
fbcd923c HW |
470 | #else |
471 | if (pf == PF_BRIDGE) { | |
472 | /* Case 1: outdev is physical output device, we need to | |
473 | * look for bridge group (when called from | |
474 | * netfilter_bridge) */ | |
1db20a52 DM |
475 | if (nla_put_be32(inst->skb, NFULA_IFINDEX_PHYSOUTDEV, |
476 | htonl(outdev->ifindex)) || | |
fbcd923c | 477 | /* this is the bridge group "brX" */ |
f350a0a8 | 478 | /* rcu_read_lock()ed by nf_hook_slow or nf_log_packet */ |
1db20a52 DM |
479 | nla_put_be32(inst->skb, NFULA_IFINDEX_OUTDEV, |
480 | htonl(br_port_get_rcu(outdev)->br->dev->ifindex))) | |
481 | goto nla_put_failure; | |
fbcd923c HW |
482 | } else { |
483 | /* Case 2: indev is a bridge group, we need to look | |
484 | * for physical device (when called from ipv4) */ | |
1db20a52 DM |
485 | if (nla_put_be32(inst->skb, NFULA_IFINDEX_OUTDEV, |
486 | htonl(outdev->ifindex))) | |
487 | goto nla_put_failure; | |
488 | if (skb->nf_bridge && skb->nf_bridge->physoutdev && | |
489 | nla_put_be32(inst->skb, NFULA_IFINDEX_PHYSOUTDEV, | |
490 | htonl(skb->nf_bridge->physoutdev->ifindex))) | |
491 | goto nla_put_failure; | |
fbcd923c HW |
492 | } |
493 | #endif | |
0597f268 HW |
494 | } |
495 | ||
1db20a52 DM |
496 | if (skb->mark && |
497 | nla_put_be32(inst->skb, NFULA_MARK, htonl(skb->mark))) | |
498 | goto nla_put_failure; | |
0597f268 | 499 | |
2c38de4c NC |
500 | if (indev && skb->dev && |
501 | skb->mac_header != skb->network_header) { | |
0597f268 | 502 | struct nfulnl_msg_packet_hw phw; |
e4d091d7 DC |
503 | int len; |
504 | ||
505 | memset(&phw, 0, sizeof(phw)); | |
506 | len = dev_parse_header(skb, phw.hw_addr); | |
b95cce35 SH |
507 | if (len > 0) { |
508 | phw.hw_addrlen = htons(len); | |
1db20a52 DM |
509 | if (nla_put(inst->skb, NFULA_HWADDR, sizeof(phw), &phw)) |
510 | goto nla_put_failure; | |
b95cce35 | 511 | } |
0597f268 HW |
512 | } |
513 | ||
72961ecf | 514 | if (indev && skb_mac_header_was_set(skb)) { |
2dba62c3 | 515 | if (nla_put_be16(inst->skb, NFULA_HWTYPE, htons(skb->dev->type)) || |
1db20a52 | 516 | nla_put_be16(inst->skb, NFULA_HWLEN, |
0c36b48b BH |
517 | htons(skb->dev->hard_header_len))) |
518 | goto nla_put_failure; | |
519 | ||
520 | hwhdrp = skb_mac_header(skb); | |
521 | ||
522 | if (skb->dev->type == ARPHRD_SIT) | |
523 | hwhdrp -= ETH_HLEN; | |
524 | ||
525 | if (hwhdrp >= skb->head && | |
526 | nla_put(inst->skb, NFULA_HWHEADER, | |
527 | skb->dev->hard_header_len, hwhdrp)) | |
1db20a52 | 528 | goto nla_put_failure; |
72961ecf EL |
529 | } |
530 | ||
b7aa0bf7 | 531 | if (skb->tstamp.tv64) { |
0597f268 | 532 | struct nfulnl_msg_packet_timestamp ts; |
b7aa0bf7 ED |
533 | struct timeval tv = ktime_to_timeval(skb->tstamp); |
534 | ts.sec = cpu_to_be64(tv.tv_sec); | |
535 | ts.usec = cpu_to_be64(tv.tv_usec); | |
0597f268 | 536 | |
1db20a52 DM |
537 | if (nla_put(inst->skb, NFULA_TIMESTAMP, sizeof(ts), &ts)) |
538 | goto nla_put_failure; | |
0597f268 HW |
539 | } |
540 | ||
541 | /* UID */ | |
0626af31 ED |
542 | sk = skb->sk; |
543 | if (sk && sk->sk_state != TCP_TIME_WAIT) { | |
544 | read_lock_bh(&sk->sk_callback_lock); | |
545 | if (sk->sk_socket && sk->sk_socket->file) { | |
546 | struct file *file = sk->sk_socket->file; | |
437589a7 LT |
547 | const struct cred *cred = file->f_cred; |
548 | struct user_namespace *user_ns = inst->peer_user_ns; | |
549 | __be32 uid = htonl(from_kuid_munged(user_ns, cred->fsuid)); | |
550 | __be32 gid = htonl(from_kgid_munged(user_ns, cred->fsgid)); | |
0626af31 | 551 | read_unlock_bh(&sk->sk_callback_lock); |
1db20a52 DM |
552 | if (nla_put_be32(inst->skb, NFULA_UID, uid) || |
553 | nla_put_be32(inst->skb, NFULA_GID, gid)) | |
554 | goto nla_put_failure; | |
0597f268 | 555 | } else |
0626af31 | 556 | read_unlock_bh(&sk->sk_callback_lock); |
0597f268 HW |
557 | } |
558 | ||
0af5f6c1 | 559 | /* local sequence number */ |
1db20a52 DM |
560 | if ((inst->flags & NFULNL_CFG_F_SEQ) && |
561 | nla_put_be32(inst->skb, NFULA_SEQ, htonl(inst->seq++))) | |
562 | goto nla_put_failure; | |
0dfedd28 | 563 | |
0af5f6c1 | 564 | /* global sequence number */ |
1db20a52 DM |
565 | if ((inst->flags & NFULNL_CFG_F_SEQ_GLOBAL) && |
566 | nla_put_be32(inst->skb, NFULA_SEQ_GLOBAL, | |
9368a53c | 567 | htonl(atomic_inc_return(&log->global_seq)))) |
1db20a52 | 568 | goto nla_put_failure; |
0af5f6c1 | 569 | |
0597f268 | 570 | if (data_len) { |
df6fb868 PM |
571 | struct nlattr *nla; |
572 | int size = nla_attr_size(data_len); | |
0597f268 | 573 | |
df6fb868 | 574 | if (skb_tailroom(inst->skb) < nla_total_size(data_len)) { |
0597f268 | 575 | printk(KERN_WARNING "nfnetlink_log: no tailroom!\n"); |
d550d095 | 576 | return -1; |
0597f268 HW |
577 | } |
578 | ||
df6fb868 PM |
579 | nla = (struct nlattr *)skb_put(inst->skb, nla_total_size(data_len)); |
580 | nla->nla_type = NFULA_PAYLOAD; | |
581 | nla->nla_len = size; | |
0597f268 | 582 | |
df6fb868 | 583 | if (skb_copy_bits(skb, 0, nla_data(nla), data_len)) |
0597f268 HW |
584 | BUG(); |
585 | } | |
601e68e1 | 586 | |
0597f268 HW |
587 | nlh->nlmsg_len = inst->skb->tail - old_tail; |
588 | return 0; | |
589 | ||
df6fb868 | 590 | nla_put_failure: |
0597f268 HW |
591 | PRINTR(KERN_ERR "nfnetlink_log: error creating log nlmsg\n"); |
592 | return -1; | |
593 | } | |
594 | ||
595 | #define RCV_SKB_FAIL(err) do { netlink_ack(skb, nlh, (err)); return; } while (0) | |
596 | ||
597 | static struct nf_loginfo default_loginfo = { | |
598 | .type = NF_LOG_TYPE_ULOG, | |
599 | .u = { | |
600 | .ulog = { | |
601 | .copy_len = 0xffff, | |
602 | .group = 0, | |
603 | .qthreshold = 1, | |
604 | }, | |
605 | }, | |
606 | }; | |
607 | ||
608 | /* log handler for internal netfilter logging api */ | |
5f7340ef | 609 | void |
8cdb46da HS |
610 | nfulnl_log_packet(struct net *net, |
611 | u_int8_t pf, | |
0597f268 HW |
612 | unsigned int hooknum, |
613 | const struct sk_buff *skb, | |
614 | const struct net_device *in, | |
615 | const struct net_device *out, | |
616 | const struct nf_loginfo *li_user, | |
617 | const char *prefix) | |
618 | { | |
619 | unsigned int size, data_len; | |
620 | struct nfulnl_instance *inst; | |
621 | const struct nf_loginfo *li; | |
622 | unsigned int qthreshold; | |
d7a5c324 | 623 | unsigned int plen; |
9368a53c | 624 | struct nfnl_log_net *log = nfnl_log_pernet(net); |
0597f268 | 625 | |
601e68e1 | 626 | if (li_user && li_user->type == NF_LOG_TYPE_ULOG) |
0597f268 HW |
627 | li = li_user; |
628 | else | |
629 | li = &default_loginfo; | |
630 | ||
9368a53c | 631 | inst = instance_lookup_get(log, li->u.ulog.group); |
0597f268 | 632 | if (!inst) |
0597f268 | 633 | return; |
0597f268 | 634 | |
d7a5c324 PM |
635 | plen = 0; |
636 | if (prefix) | |
881dbfe8 | 637 | plen = strlen(prefix) + 1; |
d7a5c324 | 638 | |
0597f268 HW |
639 | /* FIXME: do we want to make the size calculation conditional based on |
640 | * what is actually present? way more branches and checks, but more | |
641 | * memory efficient... */ | |
573ce260 | 642 | size = nlmsg_total_size(sizeof(struct nfgenmsg)) |
df6fb868 PM |
643 | + nla_total_size(sizeof(struct nfulnl_msg_packet_hdr)) |
644 | + nla_total_size(sizeof(u_int32_t)) /* ifindex */ | |
645 | + nla_total_size(sizeof(u_int32_t)) /* ifindex */ | |
fbcd923c | 646 | #ifdef CONFIG_BRIDGE_NETFILTER |
df6fb868 PM |
647 | + nla_total_size(sizeof(u_int32_t)) /* ifindex */ |
648 | + nla_total_size(sizeof(u_int32_t)) /* ifindex */ | |
fbcd923c | 649 | #endif |
df6fb868 PM |
650 | + nla_total_size(sizeof(u_int32_t)) /* mark */ |
651 | + nla_total_size(sizeof(u_int32_t)) /* uid */ | |
76aa1ce1 | 652 | + nla_total_size(sizeof(u_int32_t)) /* gid */ |
df6fb868 PM |
653 | + nla_total_size(plen) /* prefix */ |
654 | + nla_total_size(sizeof(struct nfulnl_msg_packet_hw)) | |
655 | + nla_total_size(sizeof(struct nfulnl_msg_packet_timestamp)); | |
0597f268 | 656 | |
eeff9bee PNA |
657 | if (in && skb_mac_header_was_set(skb)) { |
658 | size += nla_total_size(skb->dev->hard_header_len) | |
659 | + nla_total_size(sizeof(u_int16_t)) /* hwtype */ | |
660 | + nla_total_size(sizeof(u_int16_t)); /* hwlen */ | |
661 | } | |
662 | ||
0597f268 HW |
663 | spin_lock_bh(&inst->lock); |
664 | ||
0af5f6c1 | 665 | if (inst->flags & NFULNL_CFG_F_SEQ) |
df6fb868 | 666 | size += nla_total_size(sizeof(u_int32_t)); |
0af5f6c1 | 667 | if (inst->flags & NFULNL_CFG_F_SEQ_GLOBAL) |
df6fb868 | 668 | size += nla_total_size(sizeof(u_int32_t)); |
0af5f6c1 | 669 | |
0597f268 HW |
670 | qthreshold = inst->qthreshold; |
671 | /* per-rule qthreshold overrides per-instance */ | |
5ca431f9 EL |
672 | if (li->u.ulog.qthreshold) |
673 | if (qthreshold > li->u.ulog.qthreshold) | |
674 | qthreshold = li->u.ulog.qthreshold; | |
675 | ||
601e68e1 | 676 | |
0597f268 HW |
677 | switch (inst->copy_mode) { |
678 | case NFULNL_COPY_META: | |
679 | case NFULNL_COPY_NONE: | |
680 | data_len = 0; | |
681 | break; | |
601e68e1 | 682 | |
0597f268 | 683 | case NFULNL_COPY_PACKET: |
601e68e1 | 684 | if (inst->copy_range == 0 |
0597f268 HW |
685 | || inst->copy_range > skb->len) |
686 | data_len = skb->len; | |
687 | else | |
688 | data_len = inst->copy_range; | |
601e68e1 | 689 | |
df6fb868 | 690 | size += nla_total_size(data_len); |
0597f268 | 691 | break; |
601e68e1 | 692 | |
f5c5440d | 693 | case NFULNL_COPY_DISABLED: |
0597f268 | 694 | default: |
55b5a91e | 695 | goto unlock_and_release; |
0597f268 HW |
696 | } |
697 | ||
d63b043d MM |
698 | if (inst->skb && |
699 | size > skb_tailroom(inst->skb) - sizeof(struct nfgenmsg)) { | |
0597f268 HW |
700 | /* either the queue len is too high or we don't have |
701 | * enough room in the skb left. flush to userspace. */ | |
e3567061 | 702 | __nfulnl_flush(inst); |
55b5a91e | 703 | } |
0597f268 | 704 | |
55b5a91e | 705 | if (!inst->skb) { |
afff14f6 G |
706 | inst->skb = nfulnl_alloc_skb(net, inst->peer_portid, |
707 | inst->nlbufsiz, size); | |
55b5a91e | 708 | if (!inst->skb) |
0597f268 | 709 | goto alloc_failure; |
0597f268 HW |
710 | } |
711 | ||
0597f268 HW |
712 | inst->qlen++; |
713 | ||
9368a53c | 714 | __build_packet_message(log, inst, skb, data_len, pf, |
8248779b | 715 | hooknum, in, out, prefix, plen); |
0597f268 | 716 | |
d63b043d MM |
717 | if (inst->qlen >= qthreshold) |
718 | __nfulnl_flush(inst); | |
0597f268 HW |
719 | /* timer_pending always called within inst->lock, so there |
720 | * is no chance of a race here */ | |
d63b043d | 721 | else if (!timer_pending(&inst->timer)) { |
0597f268 HW |
722 | instance_get(inst); |
723 | inst->timer.expires = jiffies + (inst->flushtimeout*HZ/100); | |
724 | add_timer(&inst->timer); | |
725 | } | |
0597f268 | 726 | |
ed32abea MM |
727 | unlock_and_release: |
728 | spin_unlock_bh(&inst->lock); | |
729 | instance_put(inst); | |
0597f268 HW |
730 | return; |
731 | ||
732 | alloc_failure: | |
0597f268 | 733 | /* FIXME: statistics */ |
ed32abea | 734 | goto unlock_and_release; |
0597f268 | 735 | } |
5f7340ef | 736 | EXPORT_SYMBOL_GPL(nfulnl_log_packet); |
0597f268 HW |
737 | |
738 | static int | |
739 | nfulnl_rcv_nl_event(struct notifier_block *this, | |
740 | unsigned long event, void *ptr) | |
741 | { | |
742 | struct netlink_notify *n = ptr; | |
9368a53c | 743 | struct nfnl_log_net *log = nfnl_log_pernet(n->net); |
0597f268 | 744 | |
dee5817e | 745 | if (event == NETLINK_URELEASE && n->protocol == NETLINK_NETFILTER) { |
0597f268 HW |
746 | int i; |
747 | ||
15e47304 | 748 | /* destroy all instances for this portid */ |
9368a53c | 749 | spin_lock_bh(&log->instances_lock); |
0597f268 | 750 | for (i = 0; i < INSTANCE_BUCKETS; i++) { |
b67bfe0d | 751 | struct hlist_node *t2; |
0597f268 | 752 | struct nfulnl_instance *inst; |
9368a53c | 753 | struct hlist_head *head = &log->instance_table[i]; |
0597f268 | 754 | |
b67bfe0d | 755 | hlist_for_each_entry_safe(inst, t2, head, hlist) { |
9368a53c | 756 | if (n->portid == inst->peer_portid) |
0597f268 HW |
757 | __instance_destroy(inst); |
758 | } | |
759 | } | |
9368a53c | 760 | spin_unlock_bh(&log->instances_lock); |
0597f268 HW |
761 | } |
762 | return NOTIFY_DONE; | |
763 | } | |
764 | ||
765 | static struct notifier_block nfulnl_rtnl_notifier = { | |
766 | .notifier_call = nfulnl_rcv_nl_event, | |
767 | }; | |
768 | ||
769 | static int | |
770 | nfulnl_recv_unsupp(struct sock *ctnl, struct sk_buff *skb, | |
39938324 PM |
771 | const struct nlmsghdr *nlh, |
772 | const struct nlattr * const nfqa[]) | |
0597f268 HW |
773 | { |
774 | return -ENOTSUPP; | |
775 | } | |
776 | ||
ca735b3a | 777 | static struct nf_logger nfulnl_logger __read_mostly = { |
0597f268 HW |
778 | .name = "nfnetlink_log", |
779 | .logfn = &nfulnl_log_packet, | |
780 | .me = THIS_MODULE, | |
781 | }; | |
782 | ||
fd8281ad PM |
783 | static const struct nla_policy nfula_cfg_policy[NFULA_CFG_MAX+1] = { |
784 | [NFULA_CFG_CMD] = { .len = sizeof(struct nfulnl_msg_config_cmd) }, | |
785 | [NFULA_CFG_MODE] = { .len = sizeof(struct nfulnl_msg_config_mode) }, | |
786 | [NFULA_CFG_TIMEOUT] = { .type = NLA_U32 }, | |
787 | [NFULA_CFG_QTHRESH] = { .type = NLA_U32 }, | |
788 | [NFULA_CFG_NLBUFSIZ] = { .type = NLA_U32 }, | |
789 | [NFULA_CFG_FLAGS] = { .type = NLA_U16 }, | |
0597f268 HW |
790 | }; |
791 | ||
792 | static int | |
793 | nfulnl_recv_config(struct sock *ctnl, struct sk_buff *skb, | |
39938324 PM |
794 | const struct nlmsghdr *nlh, |
795 | const struct nlattr * const nfula[]) | |
0597f268 | 796 | { |
d550d095 | 797 | struct nfgenmsg *nfmsg = nlmsg_data(nlh); |
0597f268 HW |
798 | u_int16_t group_num = ntohs(nfmsg->res_id); |
799 | struct nfulnl_instance *inst; | |
b7047a1c | 800 | struct nfulnl_msg_config_cmd *cmd = NULL; |
30e0c6a6 | 801 | struct net *net = sock_net(ctnl); |
9368a53c | 802 | struct nfnl_log_net *log = nfnl_log_pernet(net); |
0597f268 HW |
803 | int ret = 0; |
804 | ||
b7047a1c PM |
805 | if (nfula[NFULA_CFG_CMD]) { |
806 | u_int8_t pf = nfmsg->nfgen_family; | |
807 | cmd = nla_data(nfula[NFULA_CFG_CMD]); | |
808 | ||
809 | /* Commands without queue context */ | |
810 | switch (cmd->command) { | |
811 | case NFULNL_CFG_CMD_PF_BIND: | |
30e0c6a6 | 812 | return nf_log_bind_pf(net, pf, &nfulnl_logger); |
b7047a1c | 813 | case NFULNL_CFG_CMD_PF_UNBIND: |
30e0c6a6 | 814 | nf_log_unbind_pf(net, pf); |
b7047a1c PM |
815 | return 0; |
816 | } | |
817 | } | |
818 | ||
9368a53c | 819 | inst = instance_lookup_get(log, group_num); |
15e47304 | 820 | if (inst && inst->peer_portid != NETLINK_CB(skb).portid) { |
c0506365 PM |
821 | ret = -EPERM; |
822 | goto out_put; | |
823 | } | |
824 | ||
b7047a1c | 825 | if (cmd != NULL) { |
0597f268 HW |
826 | switch (cmd->command) { |
827 | case NFULNL_CFG_CMD_BIND: | |
828 | if (inst) { | |
829 | ret = -EBUSY; | |
830 | goto out_put; | |
831 | } | |
832 | ||
9368a53c | 833 | inst = instance_create(net, group_num, |
15e47304 | 834 | NETLINK_CB(skb).portid, |
e32123e5 | 835 | sk_user_ns(NETLINK_CB(skb).sk)); |
baab2ce7 PM |
836 | if (IS_ERR(inst)) { |
837 | ret = PTR_ERR(inst); | |
f414c16c | 838 | goto out; |
0597f268 HW |
839 | } |
840 | break; | |
841 | case NFULNL_CFG_CMD_UNBIND: | |
842 | if (!inst) { | |
843 | ret = -ENODEV; | |
f414c16c | 844 | goto out; |
0597f268 HW |
845 | } |
846 | ||
9368a53c | 847 | instance_destroy(log, inst); |
a49c6503 | 848 | goto out_put; |
0597f268 | 849 | default: |
cd21f0ac | 850 | ret = -ENOTSUPP; |
0597f268 HW |
851 | break; |
852 | } | |
0597f268 HW |
853 | } |
854 | ||
df6fb868 | 855 | if (nfula[NFULA_CFG_MODE]) { |
0597f268 | 856 | struct nfulnl_msg_config_mode *params; |
df6fb868 | 857 | params = nla_data(nfula[NFULA_CFG_MODE]); |
0597f268 | 858 | |
c0506365 PM |
859 | if (!inst) { |
860 | ret = -ENODEV; | |
861 | goto out; | |
862 | } | |
0597f268 | 863 | nfulnl_set_mode(inst, params->copy_mode, |
d1208b99 | 864 | ntohl(params->copy_range)); |
0597f268 HW |
865 | } |
866 | ||
df6fb868 | 867 | if (nfula[NFULA_CFG_TIMEOUT]) { |
0dfedd28 | 868 | __be32 timeout = nla_get_be32(nfula[NFULA_CFG_TIMEOUT]); |
0597f268 | 869 | |
c0506365 PM |
870 | if (!inst) { |
871 | ret = -ENODEV; | |
872 | goto out; | |
873 | } | |
0597f268 HW |
874 | nfulnl_set_timeout(inst, ntohl(timeout)); |
875 | } | |
876 | ||
df6fb868 | 877 | if (nfula[NFULA_CFG_NLBUFSIZ]) { |
0dfedd28 | 878 | __be32 nlbufsiz = nla_get_be32(nfula[NFULA_CFG_NLBUFSIZ]); |
0597f268 | 879 | |
c0506365 PM |
880 | if (!inst) { |
881 | ret = -ENODEV; | |
882 | goto out; | |
883 | } | |
0597f268 HW |
884 | nfulnl_set_nlbufsiz(inst, ntohl(nlbufsiz)); |
885 | } | |
886 | ||
df6fb868 | 887 | if (nfula[NFULA_CFG_QTHRESH]) { |
0dfedd28 | 888 | __be32 qthresh = nla_get_be32(nfula[NFULA_CFG_QTHRESH]); |
0597f268 | 889 | |
c0506365 PM |
890 | if (!inst) { |
891 | ret = -ENODEV; | |
892 | goto out; | |
893 | } | |
0597f268 HW |
894 | nfulnl_set_qthresh(inst, ntohl(qthresh)); |
895 | } | |
896 | ||
df6fb868 | 897 | if (nfula[NFULA_CFG_FLAGS]) { |
0dfedd28 | 898 | __be16 flags = nla_get_be16(nfula[NFULA_CFG_FLAGS]); |
c0506365 PM |
899 | |
900 | if (!inst) { | |
901 | ret = -ENODEV; | |
902 | goto out; | |
903 | } | |
ee433530 | 904 | nfulnl_set_flags(inst, ntohs(flags)); |
0af5f6c1 HW |
905 | } |
906 | ||
0597f268 HW |
907 | out_put: |
908 | instance_put(inst); | |
dd16704e | 909 | out: |
0597f268 HW |
910 | return ret; |
911 | } | |
912 | ||
7c8d4cb4 | 913 | static const struct nfnl_callback nfulnl_cb[NFULNL_MSG_MAX] = { |
0597f268 | 914 | [NFULNL_MSG_PACKET] = { .call = nfulnl_recv_unsupp, |
37d2e7a2 | 915 | .attr_count = NFULA_MAX, }, |
0597f268 | 916 | [NFULNL_MSG_CONFIG] = { .call = nfulnl_recv_config, |
fd8281ad PM |
917 | .attr_count = NFULA_CFG_MAX, |
918 | .policy = nfula_cfg_policy }, | |
0597f268 HW |
919 | }; |
920 | ||
7c8d4cb4 | 921 | static const struct nfnetlink_subsystem nfulnl_subsys = { |
0597f268 HW |
922 | .name = "log", |
923 | .subsys_id = NFNL_SUBSYS_ULOG, | |
924 | .cb_count = NFULNL_MSG_MAX, | |
0597f268 HW |
925 | .cb = nfulnl_cb, |
926 | }; | |
927 | ||
928 | #ifdef CONFIG_PROC_FS | |
929 | struct iter_state { | |
9368a53c | 930 | struct seq_net_private p; |
0597f268 HW |
931 | unsigned int bucket; |
932 | }; | |
933 | ||
9368a53c | 934 | static struct hlist_node *get_first(struct net *net, struct iter_state *st) |
0597f268 | 935 | { |
9368a53c | 936 | struct nfnl_log_net *log; |
0597f268 HW |
937 | if (!st) |
938 | return NULL; | |
939 | ||
9368a53c G |
940 | log = nfnl_log_pernet(net); |
941 | ||
0597f268 | 942 | for (st->bucket = 0; st->bucket < INSTANCE_BUCKETS; st->bucket++) { |
9368a53c G |
943 | struct hlist_head *head = &log->instance_table[st->bucket]; |
944 | ||
945 | if (!hlist_empty(head)) | |
946 | return rcu_dereference_bh(hlist_first_rcu(head)); | |
0597f268 HW |
947 | } |
948 | return NULL; | |
949 | } | |
950 | ||
9368a53c G |
951 | static struct hlist_node *get_next(struct net *net, struct iter_state *st, |
952 | struct hlist_node *h) | |
0597f268 | 953 | { |
0e60ebe0 | 954 | h = rcu_dereference_bh(hlist_next_rcu(h)); |
0597f268 | 955 | while (!h) { |
9368a53c G |
956 | struct nfnl_log_net *log; |
957 | struct hlist_head *head; | |
958 | ||
0597f268 HW |
959 | if (++st->bucket >= INSTANCE_BUCKETS) |
960 | return NULL; | |
961 | ||
9368a53c G |
962 | log = nfnl_log_pernet(net); |
963 | head = &log->instance_table[st->bucket]; | |
964 | h = rcu_dereference_bh(hlist_first_rcu(head)); | |
0597f268 HW |
965 | } |
966 | return h; | |
967 | } | |
968 | ||
9368a53c G |
969 | static struct hlist_node *get_idx(struct net *net, struct iter_state *st, |
970 | loff_t pos) | |
0597f268 HW |
971 | { |
972 | struct hlist_node *head; | |
9368a53c | 973 | head = get_first(net, st); |
0597f268 HW |
974 | |
975 | if (head) | |
9368a53c | 976 | while (pos && (head = get_next(net, st, head))) |
0597f268 HW |
977 | pos--; |
978 | return pos ? NULL : head; | |
979 | } | |
980 | ||
9368a53c | 981 | static void *seq_start(struct seq_file *s, loff_t *pos) |
bed1be20 | 982 | __acquires(rcu_bh) |
0597f268 | 983 | { |
bed1be20 | 984 | rcu_read_lock_bh(); |
9368a53c | 985 | return get_idx(seq_file_net(s), s->private, *pos); |
0597f268 HW |
986 | } |
987 | ||
988 | static void *seq_next(struct seq_file *s, void *v, loff_t *pos) | |
989 | { | |
990 | (*pos)++; | |
9368a53c | 991 | return get_next(seq_file_net(s), s->private, v); |
0597f268 HW |
992 | } |
993 | ||
994 | static void seq_stop(struct seq_file *s, void *v) | |
bed1be20 | 995 | __releases(rcu_bh) |
0597f268 | 996 | { |
bed1be20 | 997 | rcu_read_unlock_bh(); |
0597f268 HW |
998 | } |
999 | ||
1000 | static int seq_show(struct seq_file *s, void *v) | |
1001 | { | |
1002 | const struct nfulnl_instance *inst = v; | |
1003 | ||
601e68e1 | 1004 | return seq_printf(s, "%5d %6d %5d %1d %5d %6d %2d\n", |
0597f268 | 1005 | inst->group_num, |
15e47304 | 1006 | inst->peer_portid, inst->qlen, |
0597f268 HW |
1007 | inst->copy_mode, inst->copy_range, |
1008 | inst->flushtimeout, atomic_read(&inst->use)); | |
1009 | } | |
1010 | ||
56b3d975 | 1011 | static const struct seq_operations nful_seq_ops = { |
0597f268 HW |
1012 | .start = seq_start, |
1013 | .next = seq_next, | |
1014 | .stop = seq_stop, | |
1015 | .show = seq_show, | |
1016 | }; | |
1017 | ||
1018 | static int nful_open(struct inode *inode, struct file *file) | |
1019 | { | |
9368a53c G |
1020 | return seq_open_net(inode, file, &nful_seq_ops, |
1021 | sizeof(struct iter_state)); | |
0597f268 HW |
1022 | } |
1023 | ||
da7071d7 | 1024 | static const struct file_operations nful_file_ops = { |
0597f268 HW |
1025 | .owner = THIS_MODULE, |
1026 | .open = nful_open, | |
1027 | .read = seq_read, | |
1028 | .llseek = seq_lseek, | |
9368a53c | 1029 | .release = seq_release_net, |
0597f268 HW |
1030 | }; |
1031 | ||
1032 | #endif /* PROC_FS */ | |
1033 | ||
9368a53c | 1034 | static int __net_init nfnl_log_net_init(struct net *net) |
0597f268 | 1035 | { |
9368a53c G |
1036 | unsigned int i; |
1037 | struct nfnl_log_net *log = nfnl_log_pernet(net); | |
601e68e1 | 1038 | |
0597f268 | 1039 | for (i = 0; i < INSTANCE_BUCKETS; i++) |
9368a53c G |
1040 | INIT_HLIST_HEAD(&log->instance_table[i]); |
1041 | spin_lock_init(&log->instances_lock); | |
1042 | ||
1043 | #ifdef CONFIG_PROC_FS | |
1044 | if (!proc_create("nfnetlink_log", 0440, | |
1045 | net->nf.proc_netfilter, &nful_file_ops)) | |
1046 | return -ENOMEM; | |
1047 | #endif | |
1048 | return 0; | |
1049 | } | |
1050 | ||
1051 | static void __net_exit nfnl_log_net_exit(struct net *net) | |
1052 | { | |
e778f56e | 1053 | #ifdef CONFIG_PROC_FS |
9368a53c | 1054 | remove_proc_entry("nfnetlink_log", net->nf.proc_netfilter); |
e778f56e | 1055 | #endif |
9368a53c G |
1056 | } |
1057 | ||
1058 | static struct pernet_operations nfnl_log_net_ops = { | |
1059 | .init = nfnl_log_net_init, | |
1060 | .exit = nfnl_log_net_exit, | |
1061 | .id = &nfnl_log_net_id, | |
1062 | .size = sizeof(struct nfnl_log_net), | |
1063 | }; | |
1064 | ||
1065 | static int __init nfnetlink_log_init(void) | |
1066 | { | |
1067 | int status = -ENOMEM; | |
601e68e1 | 1068 | |
0597f268 HW |
1069 | /* it's not really all that important to have a random value, so |
1070 | * we can do this from the init function, even if there hasn't | |
1071 | * been that much entropy yet */ | |
1072 | get_random_bytes(&hash_init, sizeof(hash_init)); | |
1073 | ||
1074 | netlink_register_notifier(&nfulnl_rtnl_notifier); | |
1075 | status = nfnetlink_subsys_register(&nfulnl_subsys); | |
1076 | if (status < 0) { | |
9368a53c | 1077 | pr_err("log: failed to create netlink socket\n"); |
0597f268 HW |
1078 | goto cleanup_netlink_notifier; |
1079 | } | |
1080 | ||
ca735b3a EL |
1081 | status = nf_log_register(NFPROTO_UNSPEC, &nfulnl_logger); |
1082 | if (status < 0) { | |
9368a53c | 1083 | pr_err("log: failed to register logger\n"); |
ca735b3a EL |
1084 | goto cleanup_subsys; |
1085 | } | |
1086 | ||
9368a53c G |
1087 | status = register_pernet_subsys(&nfnl_log_net_ops); |
1088 | if (status < 0) { | |
1089 | pr_err("log: failed to register pernet ops\n"); | |
ca735b3a | 1090 | goto cleanup_logger; |
6fc09f10 | 1091 | } |
0597f268 HW |
1092 | return status; |
1093 | ||
ca735b3a EL |
1094 | cleanup_logger: |
1095 | nf_log_unregister(&nfulnl_logger); | |
0597f268 | 1096 | cleanup_subsys: |
0597f268 HW |
1097 | nfnetlink_subsys_unregister(&nfulnl_subsys); |
1098 | cleanup_netlink_notifier: | |
1099 | netlink_unregister_notifier(&nfulnl_rtnl_notifier); | |
1100 | return status; | |
1101 | } | |
1102 | ||
65b4b4e8 | 1103 | static void __exit nfnetlink_log_fini(void) |
0597f268 | 1104 | { |
9368a53c | 1105 | unregister_pernet_subsys(&nfnl_log_net_ops); |
e92ad99c | 1106 | nf_log_unregister(&nfulnl_logger); |
32292a7f PM |
1107 | nfnetlink_subsys_unregister(&nfulnl_subsys); |
1108 | netlink_unregister_notifier(&nfulnl_rtnl_notifier); | |
0597f268 HW |
1109 | } |
1110 | ||
1111 | MODULE_DESCRIPTION("netfilter userspace logging"); | |
1112 | MODULE_AUTHOR("Harald Welte <laforge@netfilter.org>"); | |
1113 | MODULE_LICENSE("GPL"); | |
f682faef | 1114 | MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_ULOG); |
0597f268 | 1115 | |
65b4b4e8 AM |
1116 | module_init(nfnetlink_log_init); |
1117 | module_exit(nfnetlink_log_fini); |