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Commit | Line | Data |
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0597f268 HW |
1 | /* |
2 | * This is a module which is used for logging packets to userspace via | |
3 | * nfetlink. | |
4 | * | |
5 | * (C) 2005 by Harald Welte <laforge@netfilter.org> | |
6 | * | |
7 | * Based on the old ipv4-only ipt_ULOG.c: | |
8 | * (C) 2000-2004 by Harald Welte <laforge@netfilter.org> | |
9 | * | |
10 | * This program is free software; you can redistribute it and/or modify | |
11 | * it under the terms of the GNU General Public License version 2 as | |
12 | * published by the Free Software Foundation. | |
0597f268 HW |
13 | */ |
14 | #include <linux/module.h> | |
15 | #include <linux/skbuff.h> | |
e035edd1 | 16 | #include <linux/if_arp.h> |
0597f268 HW |
17 | #include <linux/init.h> |
18 | #include <linux/ip.h> | |
19 | #include <linux/ipv6.h> | |
20 | #include <linux/netdevice.h> | |
21 | #include <linux/netfilter.h> | |
573ce260 | 22 | #include <net/netlink.h> |
0597f268 HW |
23 | #include <linux/netfilter/nfnetlink.h> |
24 | #include <linux/netfilter/nfnetlink_log.h> | |
25 | #include <linux/spinlock.h> | |
26 | #include <linux/sysctl.h> | |
27 | #include <linux/proc_fs.h> | |
28 | #include <linux/security.h> | |
29 | #include <linux/list.h> | |
30 | #include <linux/jhash.h> | |
31 | #include <linux/random.h> | |
5a0e3ad6 | 32 | #include <linux/slab.h> |
0597f268 | 33 | #include <net/sock.h> |
f01ffbd6 | 34 | #include <net/netfilter/nf_log.h> |
9368a53c | 35 | #include <net/netns/generic.h> |
d9e15007 | 36 | #include <net/netfilter/nfnetlink_log.h> |
0597f268 | 37 | |
60063497 | 38 | #include <linux/atomic.h> |
0597f268 | 39 | |
fbcd923c HW |
40 | #ifdef CONFIG_BRIDGE_NETFILTER |
41 | #include "../bridge/br_private.h" | |
42 | #endif | |
43 | ||
c2db2924 | 44 | #define NFULNL_NLBUFSIZ_DEFAULT NLMSG_GOODSIZE |
2c6764b7 | 45 | #define NFULNL_TIMEOUT_DEFAULT 100 /* every second */ |
0597f268 | 46 | #define NFULNL_QTHRESH_DEFAULT 100 /* 100 packets */ |
6b6ec99a | 47 | #define NFULNL_COPY_RANGE_MAX 0xFFFF /* max packet size is limited by 16-bit struct nfattr nfa_len field */ |
0597f268 HW |
48 | |
49 | #define PRINTR(x, args...) do { if (net_ratelimit()) \ | |
50 | printk(x, ## args); } while (0); | |
51 | ||
0597f268 HW |
52 | struct nfulnl_instance { |
53 | struct hlist_node hlist; /* global list of instances */ | |
54 | spinlock_t lock; | |
55 | atomic_t use; /* use count */ | |
56 | ||
57 | unsigned int qlen; /* number of nlmsgs in skb */ | |
58 | struct sk_buff *skb; /* pre-allocatd skb */ | |
0597f268 | 59 | struct timer_list timer; |
9368a53c | 60 | struct net *net; |
9eea9515 | 61 | struct user_namespace *peer_user_ns; /* User namespace of the peer process */ |
15e47304 | 62 | int peer_portid; /* PORTID of the peer process */ |
0597f268 HW |
63 | |
64 | /* configurable parameters */ | |
65 | unsigned int flushtimeout; /* timeout until queue flush */ | |
66 | unsigned int nlbufsiz; /* netlink buffer allocation size */ | |
67 | unsigned int qthreshold; /* threshold of the queue */ | |
68 | u_int32_t copy_range; | |
0af5f6c1 | 69 | u_int32_t seq; /* instance-local sequential counter */ |
0597f268 | 70 | u_int16_t group_num; /* number of this queue */ |
0af5f6c1 | 71 | u_int16_t flags; |
601e68e1 | 72 | u_int8_t copy_mode; |
bed1be20 | 73 | struct rcu_head rcu; |
0597f268 HW |
74 | }; |
75 | ||
0597f268 | 76 | #define INSTANCE_BUCKETS 16 |
0597f268 HW |
77 | static unsigned int hash_init; |
78 | ||
9368a53c G |
79 | static int nfnl_log_net_id __read_mostly; |
80 | ||
81 | struct nfnl_log_net { | |
82 | spinlock_t instances_lock; | |
83 | struct hlist_head instance_table[INSTANCE_BUCKETS]; | |
84 | atomic_t global_seq; | |
85 | }; | |
86 | ||
87 | static struct nfnl_log_net *nfnl_log_pernet(struct net *net) | |
88 | { | |
89 | return net_generic(net, nfnl_log_net_id); | |
90 | } | |
91 | ||
0597f268 HW |
92 | static inline u_int8_t instance_hashfn(u_int16_t group_num) |
93 | { | |
94 | return ((group_num & 0xff) % INSTANCE_BUCKETS); | |
95 | } | |
96 | ||
97 | static struct nfulnl_instance * | |
9368a53c | 98 | __instance_lookup(struct nfnl_log_net *log, u_int16_t group_num) |
0597f268 HW |
99 | { |
100 | struct hlist_head *head; | |
0597f268 HW |
101 | struct nfulnl_instance *inst; |
102 | ||
9368a53c | 103 | head = &log->instance_table[instance_hashfn(group_num)]; |
b67bfe0d | 104 | hlist_for_each_entry_rcu(inst, head, hlist) { |
0597f268 HW |
105 | if (inst->group_num == group_num) |
106 | return inst; | |
107 | } | |
108 | return NULL; | |
109 | } | |
110 | ||
111 | static inline void | |
112 | instance_get(struct nfulnl_instance *inst) | |
113 | { | |
114 | atomic_inc(&inst->use); | |
115 | } | |
116 | ||
117 | static struct nfulnl_instance * | |
9368a53c | 118 | instance_lookup_get(struct nfnl_log_net *log, u_int16_t group_num) |
0597f268 HW |
119 | { |
120 | struct nfulnl_instance *inst; | |
121 | ||
bed1be20 | 122 | rcu_read_lock_bh(); |
9368a53c | 123 | inst = __instance_lookup(log, group_num); |
f5c5440d ED |
124 | if (inst && !atomic_inc_not_zero(&inst->use)) |
125 | inst = NULL; | |
bed1be20 | 126 | rcu_read_unlock_bh(); |
0597f268 HW |
127 | |
128 | return inst; | |
129 | } | |
130 | ||
bed1be20 ED |
131 | static void nfulnl_instance_free_rcu(struct rcu_head *head) |
132 | { | |
9368a53c G |
133 | struct nfulnl_instance *inst = |
134 | container_of(head, struct nfulnl_instance, rcu); | |
135 | ||
136 | put_net(inst->net); | |
137 | kfree(inst); | |
bed1be20 ED |
138 | module_put(THIS_MODULE); |
139 | } | |
140 | ||
0597f268 HW |
141 | static void |
142 | instance_put(struct nfulnl_instance *inst) | |
143 | { | |
bed1be20 ED |
144 | if (inst && atomic_dec_and_test(&inst->use)) |
145 | call_rcu_bh(&inst->rcu, nfulnl_instance_free_rcu); | |
0597f268 HW |
146 | } |
147 | ||
148 | static void nfulnl_timer(unsigned long data); | |
149 | ||
150 | static struct nfulnl_instance * | |
9368a53c G |
151 | instance_create(struct net *net, u_int16_t group_num, |
152 | int portid, struct user_namespace *user_ns) | |
0597f268 HW |
153 | { |
154 | struct nfulnl_instance *inst; | |
9368a53c | 155 | struct nfnl_log_net *log = nfnl_log_pernet(net); |
baab2ce7 | 156 | int err; |
0597f268 | 157 | |
9368a53c G |
158 | spin_lock_bh(&log->instances_lock); |
159 | if (__instance_lookup(log, group_num)) { | |
baab2ce7 | 160 | err = -EEXIST; |
0597f268 HW |
161 | goto out_unlock; |
162 | } | |
163 | ||
10dfdc69 | 164 | inst = kzalloc(sizeof(*inst), GFP_ATOMIC); |
baab2ce7 PM |
165 | if (!inst) { |
166 | err = -ENOMEM; | |
0597f268 | 167 | goto out_unlock; |
baab2ce7 | 168 | } |
0597f268 | 169 | |
aace57e0 MM |
170 | if (!try_module_get(THIS_MODULE)) { |
171 | kfree(inst); | |
baab2ce7 | 172 | err = -EAGAIN; |
aace57e0 MM |
173 | goto out_unlock; |
174 | } | |
175 | ||
0597f268 | 176 | INIT_HLIST_NODE(&inst->hlist); |
181a46a5 | 177 | spin_lock_init(&inst->lock); |
0597f268 HW |
178 | /* needs to be two, since we _put() after creation */ |
179 | atomic_set(&inst->use, 2); | |
180 | ||
e6f689db | 181 | setup_timer(&inst->timer, nfulnl_timer, (unsigned long)inst); |
0597f268 | 182 | |
9368a53c | 183 | inst->net = get_net(net); |
9eea9515 | 184 | inst->peer_user_ns = user_ns; |
15e47304 | 185 | inst->peer_portid = portid; |
0597f268 HW |
186 | inst->group_num = group_num; |
187 | ||
188 | inst->qthreshold = NFULNL_QTHRESH_DEFAULT; | |
189 | inst->flushtimeout = NFULNL_TIMEOUT_DEFAULT; | |
190 | inst->nlbufsiz = NFULNL_NLBUFSIZ_DEFAULT; | |
191 | inst->copy_mode = NFULNL_COPY_PACKET; | |
6b6ec99a | 192 | inst->copy_range = NFULNL_COPY_RANGE_MAX; |
0597f268 | 193 | |
f5c5440d | 194 | hlist_add_head_rcu(&inst->hlist, |
9368a53c G |
195 | &log->instance_table[instance_hashfn(group_num)]); |
196 | ||
0597f268 | 197 | |
9368a53c | 198 | spin_unlock_bh(&log->instances_lock); |
0597f268 HW |
199 | |
200 | return inst; | |
201 | ||
0597f268 | 202 | out_unlock: |
9368a53c | 203 | spin_unlock_bh(&log->instances_lock); |
baab2ce7 | 204 | return ERR_PTR(err); |
0597f268 HW |
205 | } |
206 | ||
e3567061 | 207 | static void __nfulnl_flush(struct nfulnl_instance *inst); |
0597f268 | 208 | |
f5c5440d | 209 | /* called with BH disabled */ |
0597f268 | 210 | static void |
9afdb00c | 211 | __instance_destroy(struct nfulnl_instance *inst) |
0597f268 HW |
212 | { |
213 | /* first pull it out of the global list */ | |
f5c5440d | 214 | hlist_del_rcu(&inst->hlist); |
0597f268 | 215 | |
0597f268 HW |
216 | /* then flush all pending packets from skb */ |
217 | ||
f5c5440d ED |
218 | spin_lock(&inst->lock); |
219 | ||
220 | /* lockless readers wont be able to use us */ | |
221 | inst->copy_mode = NFULNL_COPY_DISABLED; | |
222 | ||
e3567061 MM |
223 | if (inst->skb) |
224 | __nfulnl_flush(inst); | |
f5c5440d | 225 | spin_unlock(&inst->lock); |
0597f268 HW |
226 | |
227 | /* and finally put the refcount */ | |
228 | instance_put(inst); | |
0597f268 HW |
229 | } |
230 | ||
0597f268 | 231 | static inline void |
9368a53c G |
232 | instance_destroy(struct nfnl_log_net *log, |
233 | struct nfulnl_instance *inst) | |
0597f268 | 234 | { |
9368a53c | 235 | spin_lock_bh(&log->instances_lock); |
9afdb00c | 236 | __instance_destroy(inst); |
9368a53c | 237 | spin_unlock_bh(&log->instances_lock); |
0597f268 HW |
238 | } |
239 | ||
240 | static int | |
241 | nfulnl_set_mode(struct nfulnl_instance *inst, u_int8_t mode, | |
242 | unsigned int range) | |
243 | { | |
244 | int status = 0; | |
245 | ||
246 | spin_lock_bh(&inst->lock); | |
601e68e1 | 247 | |
0597f268 HW |
248 | switch (mode) { |
249 | case NFULNL_COPY_NONE: | |
250 | case NFULNL_COPY_META: | |
251 | inst->copy_mode = mode; | |
252 | inst->copy_range = 0; | |
253 | break; | |
601e68e1 | 254 | |
0597f268 HW |
255 | case NFULNL_COPY_PACKET: |
256 | inst->copy_mode = mode; | |
6b6ec99a MM |
257 | inst->copy_range = min_t(unsigned int, |
258 | range, NFULNL_COPY_RANGE_MAX); | |
0597f268 | 259 | break; |
601e68e1 | 260 | |
0597f268 HW |
261 | default: |
262 | status = -EINVAL; | |
263 | break; | |
264 | } | |
265 | ||
266 | spin_unlock_bh(&inst->lock); | |
267 | ||
268 | return status; | |
269 | } | |
270 | ||
271 | static int | |
272 | nfulnl_set_nlbufsiz(struct nfulnl_instance *inst, u_int32_t nlbufsiz) | |
273 | { | |
274 | int status; | |
275 | ||
276 | spin_lock_bh(&inst->lock); | |
277 | if (nlbufsiz < NFULNL_NLBUFSIZ_DEFAULT) | |
278 | status = -ERANGE; | |
279 | else if (nlbufsiz > 131072) | |
280 | status = -ERANGE; | |
281 | else { | |
282 | inst->nlbufsiz = nlbufsiz; | |
283 | status = 0; | |
284 | } | |
285 | spin_unlock_bh(&inst->lock); | |
286 | ||
287 | return status; | |
288 | } | |
289 | ||
290 | static int | |
291 | nfulnl_set_timeout(struct nfulnl_instance *inst, u_int32_t timeout) | |
292 | { | |
293 | spin_lock_bh(&inst->lock); | |
294 | inst->flushtimeout = timeout; | |
295 | spin_unlock_bh(&inst->lock); | |
296 | ||
297 | return 0; | |
298 | } | |
299 | ||
300 | static int | |
301 | nfulnl_set_qthresh(struct nfulnl_instance *inst, u_int32_t qthresh) | |
302 | { | |
303 | spin_lock_bh(&inst->lock); | |
304 | inst->qthreshold = qthresh; | |
305 | spin_unlock_bh(&inst->lock); | |
306 | ||
307 | return 0; | |
308 | } | |
309 | ||
0af5f6c1 HW |
310 | static int |
311 | nfulnl_set_flags(struct nfulnl_instance *inst, u_int16_t flags) | |
312 | { | |
313 | spin_lock_bh(&inst->lock); | |
ee433530 | 314 | inst->flags = flags; |
0af5f6c1 HW |
315 | spin_unlock_bh(&inst->lock); |
316 | ||
317 | return 0; | |
318 | } | |
319 | ||
c6a8f648 MM |
320 | static struct sk_buff * |
321 | nfulnl_alloc_skb(unsigned int inst_size, unsigned int pkt_size) | |
0597f268 HW |
322 | { |
323 | struct sk_buff *skb; | |
ad2ad0f9 | 324 | unsigned int n; |
0597f268 | 325 | |
0597f268 HW |
326 | /* alloc skb which should be big enough for a whole multipart |
327 | * message. WARNING: has to be <= 128k due to slab restrictions */ | |
328 | ||
ad2ad0f9 PM |
329 | n = max(inst_size, pkt_size); |
330 | skb = alloc_skb(n, GFP_ATOMIC); | |
0597f268 | 331 | if (!skb) { |
ad2ad0f9 PM |
332 | if (n > pkt_size) { |
333 | /* try to allocate only as much as we need for current | |
334 | * packet */ | |
0597f268 | 335 | |
ad2ad0f9 PM |
336 | skb = alloc_skb(pkt_size, GFP_ATOMIC); |
337 | if (!skb) | |
0a9ee813 JP |
338 | pr_err("nfnetlink_log: can't even alloc %u bytes\n", |
339 | pkt_size); | |
ad2ad0f9 | 340 | } |
0597f268 HW |
341 | } |
342 | ||
343 | return skb; | |
344 | } | |
345 | ||
346 | static int | |
347 | __nfulnl_send(struct nfulnl_instance *inst) | |
348 | { | |
29c5d4af | 349 | int status = -1; |
0597f268 | 350 | |
d550d095 DM |
351 | if (inst->qlen > 1) { |
352 | struct nlmsghdr *nlh = nlmsg_put(inst->skb, 0, 0, | |
353 | NLMSG_DONE, | |
354 | sizeof(struct nfgenmsg), | |
355 | 0); | |
356 | if (!nlh) | |
357 | goto out; | |
358 | } | |
9368a53c | 359 | status = nfnetlink_unicast(inst->skb, inst->net, inst->peer_portid, |
cd8c20b6 | 360 | MSG_DONTWAIT); |
0597f268 HW |
361 | |
362 | inst->qlen = 0; | |
363 | inst->skb = NULL; | |
d550d095 | 364 | out: |
0597f268 HW |
365 | return status; |
366 | } | |
367 | ||
e3567061 MM |
368 | static void |
369 | __nfulnl_flush(struct nfulnl_instance *inst) | |
370 | { | |
371 | /* timer holds a reference */ | |
372 | if (del_timer(&inst->timer)) | |
373 | instance_put(inst); | |
374 | if (inst->skb) | |
375 | __nfulnl_send(inst); | |
376 | } | |
377 | ||
c6a8f648 MM |
378 | static void |
379 | nfulnl_timer(unsigned long data) | |
0597f268 | 380 | { |
601e68e1 | 381 | struct nfulnl_instance *inst = (struct nfulnl_instance *)data; |
0597f268 | 382 | |
0597f268 | 383 | spin_lock_bh(&inst->lock); |
370e6a87 MM |
384 | if (inst->skb) |
385 | __nfulnl_send(inst); | |
0597f268 | 386 | spin_unlock_bh(&inst->lock); |
05f7b7b3 | 387 | instance_put(inst); |
0597f268 HW |
388 | } |
389 | ||
0af5f6c1 HW |
390 | /* This is an inline function, we don't really care about a long |
391 | * list of arguments */ | |
601e68e1 | 392 | static inline int |
9368a53c G |
393 | __build_packet_message(struct nfnl_log_net *log, |
394 | struct nfulnl_instance *inst, | |
601e68e1 | 395 | const struct sk_buff *skb, |
0597f268 | 396 | unsigned int data_len, |
76108cea | 397 | u_int8_t pf, |
0597f268 HW |
398 | unsigned int hooknum, |
399 | const struct net_device *indev, | |
400 | const struct net_device *outdev, | |
d7a5c324 | 401 | const char *prefix, unsigned int plen) |
0597f268 | 402 | { |
0597f268 HW |
403 | struct nfulnl_msg_packet_hdr pmsg; |
404 | struct nlmsghdr *nlh; | |
405 | struct nfgenmsg *nfmsg; | |
27a884dc | 406 | sk_buff_data_t old_tail = inst->skb->tail; |
0626af31 | 407 | struct sock *sk; |
0c36b48b | 408 | const unsigned char *hwhdrp; |
0597f268 | 409 | |
d550d095 | 410 | nlh = nlmsg_put(inst->skb, 0, 0, |
0597f268 | 411 | NFNL_SUBSYS_ULOG << 8 | NFULNL_MSG_PACKET, |
d550d095 DM |
412 | sizeof(struct nfgenmsg), 0); |
413 | if (!nlh) | |
414 | return -1; | |
415 | nfmsg = nlmsg_data(nlh); | |
0597f268 HW |
416 | nfmsg->nfgen_family = pf; |
417 | nfmsg->version = NFNETLINK_V0; | |
418 | nfmsg->res_id = htons(inst->group_num); | |
419 | ||
febf0a43 | 420 | pmsg.hw_protocol = skb->protocol; |
0597f268 HW |
421 | pmsg.hook = hooknum; |
422 | ||
1db20a52 DM |
423 | if (nla_put(inst->skb, NFULA_PACKET_HDR, sizeof(pmsg), &pmsg)) |
424 | goto nla_put_failure; | |
0597f268 | 425 | |
1db20a52 DM |
426 | if (prefix && |
427 | nla_put(inst->skb, NFULA_PREFIX, plen, prefix)) | |
428 | goto nla_put_failure; | |
0597f268 HW |
429 | |
430 | if (indev) { | |
fbcd923c | 431 | #ifndef CONFIG_BRIDGE_NETFILTER |
1db20a52 DM |
432 | if (nla_put_be32(inst->skb, NFULA_IFINDEX_INDEV, |
433 | htonl(indev->ifindex))) | |
434 | goto nla_put_failure; | |
fbcd923c HW |
435 | #else |
436 | if (pf == PF_BRIDGE) { | |
437 | /* Case 1: outdev is physical input device, we need to | |
438 | * look for bridge group (when called from | |
439 | * netfilter_bridge) */ | |
1db20a52 DM |
440 | if (nla_put_be32(inst->skb, NFULA_IFINDEX_PHYSINDEV, |
441 | htonl(indev->ifindex)) || | |
fbcd923c | 442 | /* this is the bridge group "brX" */ |
f350a0a8 | 443 | /* rcu_read_lock()ed by nf_hook_slow or nf_log_packet */ |
1db20a52 DM |
444 | nla_put_be32(inst->skb, NFULA_IFINDEX_INDEV, |
445 | htonl(br_port_get_rcu(indev)->br->dev->ifindex))) | |
446 | goto nla_put_failure; | |
fbcd923c HW |
447 | } else { |
448 | /* Case 2: indev is bridge group, we need to look for | |
449 | * physical device (when called from ipv4) */ | |
1db20a52 DM |
450 | if (nla_put_be32(inst->skb, NFULA_IFINDEX_INDEV, |
451 | htonl(indev->ifindex))) | |
452 | goto nla_put_failure; | |
453 | if (skb->nf_bridge && skb->nf_bridge->physindev && | |
454 | nla_put_be32(inst->skb, NFULA_IFINDEX_PHYSINDEV, | |
455 | htonl(skb->nf_bridge->physindev->ifindex))) | |
456 | goto nla_put_failure; | |
fbcd923c HW |
457 | } |
458 | #endif | |
0597f268 HW |
459 | } |
460 | ||
461 | if (outdev) { | |
fbcd923c | 462 | #ifndef CONFIG_BRIDGE_NETFILTER |
1db20a52 DM |
463 | if (nla_put_be32(inst->skb, NFULA_IFINDEX_OUTDEV, |
464 | htonl(outdev->ifindex))) | |
465 | goto nla_put_failure; | |
fbcd923c HW |
466 | #else |
467 | if (pf == PF_BRIDGE) { | |
468 | /* Case 1: outdev is physical output device, we need to | |
469 | * look for bridge group (when called from | |
470 | * netfilter_bridge) */ | |
1db20a52 DM |
471 | if (nla_put_be32(inst->skb, NFULA_IFINDEX_PHYSOUTDEV, |
472 | htonl(outdev->ifindex)) || | |
fbcd923c | 473 | /* this is the bridge group "brX" */ |
f350a0a8 | 474 | /* rcu_read_lock()ed by nf_hook_slow or nf_log_packet */ |
1db20a52 DM |
475 | nla_put_be32(inst->skb, NFULA_IFINDEX_OUTDEV, |
476 | htonl(br_port_get_rcu(outdev)->br->dev->ifindex))) | |
477 | goto nla_put_failure; | |
fbcd923c HW |
478 | } else { |
479 | /* Case 2: indev is a bridge group, we need to look | |
480 | * for physical device (when called from ipv4) */ | |
1db20a52 DM |
481 | if (nla_put_be32(inst->skb, NFULA_IFINDEX_OUTDEV, |
482 | htonl(outdev->ifindex))) | |
483 | goto nla_put_failure; | |
484 | if (skb->nf_bridge && skb->nf_bridge->physoutdev && | |
485 | nla_put_be32(inst->skb, NFULA_IFINDEX_PHYSOUTDEV, | |
486 | htonl(skb->nf_bridge->physoutdev->ifindex))) | |
487 | goto nla_put_failure; | |
fbcd923c HW |
488 | } |
489 | #endif | |
0597f268 HW |
490 | } |
491 | ||
1db20a52 DM |
492 | if (skb->mark && |
493 | nla_put_be32(inst->skb, NFULA_MARK, htonl(skb->mark))) | |
494 | goto nla_put_failure; | |
0597f268 | 495 | |
2c38de4c NC |
496 | if (indev && skb->dev && |
497 | skb->mac_header != skb->network_header) { | |
0597f268 | 498 | struct nfulnl_msg_packet_hw phw; |
b95cce35 SH |
499 | int len = dev_parse_header(skb, phw.hw_addr); |
500 | if (len > 0) { | |
501 | phw.hw_addrlen = htons(len); | |
1db20a52 DM |
502 | if (nla_put(inst->skb, NFULA_HWADDR, sizeof(phw), &phw)) |
503 | goto nla_put_failure; | |
b95cce35 | 504 | } |
0597f268 HW |
505 | } |
506 | ||
72961ecf | 507 | if (indev && skb_mac_header_was_set(skb)) { |
2dba62c3 | 508 | if (nla_put_be16(inst->skb, NFULA_HWTYPE, htons(skb->dev->type)) || |
1db20a52 | 509 | nla_put_be16(inst->skb, NFULA_HWLEN, |
0c36b48b BH |
510 | htons(skb->dev->hard_header_len))) |
511 | goto nla_put_failure; | |
512 | ||
513 | hwhdrp = skb_mac_header(skb); | |
514 | ||
515 | if (skb->dev->type == ARPHRD_SIT) | |
516 | hwhdrp -= ETH_HLEN; | |
517 | ||
518 | if (hwhdrp >= skb->head && | |
519 | nla_put(inst->skb, NFULA_HWHEADER, | |
520 | skb->dev->hard_header_len, hwhdrp)) | |
1db20a52 | 521 | goto nla_put_failure; |
72961ecf EL |
522 | } |
523 | ||
b7aa0bf7 | 524 | if (skb->tstamp.tv64) { |
0597f268 | 525 | struct nfulnl_msg_packet_timestamp ts; |
b7aa0bf7 ED |
526 | struct timeval tv = ktime_to_timeval(skb->tstamp); |
527 | ts.sec = cpu_to_be64(tv.tv_sec); | |
528 | ts.usec = cpu_to_be64(tv.tv_usec); | |
0597f268 | 529 | |
1db20a52 DM |
530 | if (nla_put(inst->skb, NFULA_TIMESTAMP, sizeof(ts), &ts)) |
531 | goto nla_put_failure; | |
0597f268 HW |
532 | } |
533 | ||
534 | /* UID */ | |
0626af31 ED |
535 | sk = skb->sk; |
536 | if (sk && sk->sk_state != TCP_TIME_WAIT) { | |
537 | read_lock_bh(&sk->sk_callback_lock); | |
538 | if (sk->sk_socket && sk->sk_socket->file) { | |
539 | struct file *file = sk->sk_socket->file; | |
437589a7 LT |
540 | const struct cred *cred = file->f_cred; |
541 | struct user_namespace *user_ns = inst->peer_user_ns; | |
542 | __be32 uid = htonl(from_kuid_munged(user_ns, cred->fsuid)); | |
543 | __be32 gid = htonl(from_kgid_munged(user_ns, cred->fsgid)); | |
0626af31 | 544 | read_unlock_bh(&sk->sk_callback_lock); |
1db20a52 DM |
545 | if (nla_put_be32(inst->skb, NFULA_UID, uid) || |
546 | nla_put_be32(inst->skb, NFULA_GID, gid)) | |
547 | goto nla_put_failure; | |
0597f268 | 548 | } else |
0626af31 | 549 | read_unlock_bh(&sk->sk_callback_lock); |
0597f268 HW |
550 | } |
551 | ||
0af5f6c1 | 552 | /* local sequence number */ |
1db20a52 DM |
553 | if ((inst->flags & NFULNL_CFG_F_SEQ) && |
554 | nla_put_be32(inst->skb, NFULA_SEQ, htonl(inst->seq++))) | |
555 | goto nla_put_failure; | |
0dfedd28 | 556 | |
0af5f6c1 | 557 | /* global sequence number */ |
1db20a52 DM |
558 | if ((inst->flags & NFULNL_CFG_F_SEQ_GLOBAL) && |
559 | nla_put_be32(inst->skb, NFULA_SEQ_GLOBAL, | |
9368a53c | 560 | htonl(atomic_inc_return(&log->global_seq)))) |
1db20a52 | 561 | goto nla_put_failure; |
0af5f6c1 | 562 | |
0597f268 | 563 | if (data_len) { |
df6fb868 PM |
564 | struct nlattr *nla; |
565 | int size = nla_attr_size(data_len); | |
0597f268 | 566 | |
df6fb868 | 567 | if (skb_tailroom(inst->skb) < nla_total_size(data_len)) { |
0597f268 | 568 | printk(KERN_WARNING "nfnetlink_log: no tailroom!\n"); |
d550d095 | 569 | return -1; |
0597f268 HW |
570 | } |
571 | ||
df6fb868 PM |
572 | nla = (struct nlattr *)skb_put(inst->skb, nla_total_size(data_len)); |
573 | nla->nla_type = NFULA_PAYLOAD; | |
574 | nla->nla_len = size; | |
0597f268 | 575 | |
df6fb868 | 576 | if (skb_copy_bits(skb, 0, nla_data(nla), data_len)) |
0597f268 HW |
577 | BUG(); |
578 | } | |
601e68e1 | 579 | |
0597f268 HW |
580 | nlh->nlmsg_len = inst->skb->tail - old_tail; |
581 | return 0; | |
582 | ||
df6fb868 | 583 | nla_put_failure: |
0597f268 HW |
584 | PRINTR(KERN_ERR "nfnetlink_log: error creating log nlmsg\n"); |
585 | return -1; | |
586 | } | |
587 | ||
588 | #define RCV_SKB_FAIL(err) do { netlink_ack(skb, nlh, (err)); return; } while (0) | |
589 | ||
590 | static struct nf_loginfo default_loginfo = { | |
591 | .type = NF_LOG_TYPE_ULOG, | |
592 | .u = { | |
593 | .ulog = { | |
594 | .copy_len = 0xffff, | |
595 | .group = 0, | |
596 | .qthreshold = 1, | |
597 | }, | |
598 | }, | |
599 | }; | |
600 | ||
601 | /* log handler for internal netfilter logging api */ | |
5f7340ef | 602 | void |
76108cea | 603 | nfulnl_log_packet(u_int8_t pf, |
0597f268 HW |
604 | unsigned int hooknum, |
605 | const struct sk_buff *skb, | |
606 | const struct net_device *in, | |
607 | const struct net_device *out, | |
608 | const struct nf_loginfo *li_user, | |
609 | const char *prefix) | |
610 | { | |
611 | unsigned int size, data_len; | |
612 | struct nfulnl_instance *inst; | |
613 | const struct nf_loginfo *li; | |
614 | unsigned int qthreshold; | |
d7a5c324 | 615 | unsigned int plen; |
9368a53c G |
616 | struct net *net = dev_net(in ? in : out); |
617 | struct nfnl_log_net *log = nfnl_log_pernet(net); | |
0597f268 | 618 | |
601e68e1 | 619 | if (li_user && li_user->type == NF_LOG_TYPE_ULOG) |
0597f268 HW |
620 | li = li_user; |
621 | else | |
622 | li = &default_loginfo; | |
623 | ||
9368a53c | 624 | inst = instance_lookup_get(log, li->u.ulog.group); |
0597f268 | 625 | if (!inst) |
0597f268 | 626 | return; |
0597f268 | 627 | |
d7a5c324 PM |
628 | plen = 0; |
629 | if (prefix) | |
881dbfe8 | 630 | plen = strlen(prefix) + 1; |
d7a5c324 | 631 | |
0597f268 HW |
632 | /* FIXME: do we want to make the size calculation conditional based on |
633 | * what is actually present? way more branches and checks, but more | |
634 | * memory efficient... */ | |
573ce260 | 635 | size = nlmsg_total_size(sizeof(struct nfgenmsg)) |
df6fb868 PM |
636 | + nla_total_size(sizeof(struct nfulnl_msg_packet_hdr)) |
637 | + nla_total_size(sizeof(u_int32_t)) /* ifindex */ | |
638 | + nla_total_size(sizeof(u_int32_t)) /* ifindex */ | |
fbcd923c | 639 | #ifdef CONFIG_BRIDGE_NETFILTER |
df6fb868 PM |
640 | + nla_total_size(sizeof(u_int32_t)) /* ifindex */ |
641 | + nla_total_size(sizeof(u_int32_t)) /* ifindex */ | |
fbcd923c | 642 | #endif |
df6fb868 PM |
643 | + nla_total_size(sizeof(u_int32_t)) /* mark */ |
644 | + nla_total_size(sizeof(u_int32_t)) /* uid */ | |
76aa1ce1 | 645 | + nla_total_size(sizeof(u_int32_t)) /* gid */ |
df6fb868 PM |
646 | + nla_total_size(plen) /* prefix */ |
647 | + nla_total_size(sizeof(struct nfulnl_msg_packet_hw)) | |
648 | + nla_total_size(sizeof(struct nfulnl_msg_packet_timestamp)); | |
0597f268 | 649 | |
eeff9bee PNA |
650 | if (in && skb_mac_header_was_set(skb)) { |
651 | size += nla_total_size(skb->dev->hard_header_len) | |
652 | + nla_total_size(sizeof(u_int16_t)) /* hwtype */ | |
653 | + nla_total_size(sizeof(u_int16_t)); /* hwlen */ | |
654 | } | |
655 | ||
0597f268 HW |
656 | spin_lock_bh(&inst->lock); |
657 | ||
0af5f6c1 | 658 | if (inst->flags & NFULNL_CFG_F_SEQ) |
df6fb868 | 659 | size += nla_total_size(sizeof(u_int32_t)); |
0af5f6c1 | 660 | if (inst->flags & NFULNL_CFG_F_SEQ_GLOBAL) |
df6fb868 | 661 | size += nla_total_size(sizeof(u_int32_t)); |
0af5f6c1 | 662 | |
0597f268 HW |
663 | qthreshold = inst->qthreshold; |
664 | /* per-rule qthreshold overrides per-instance */ | |
5ca431f9 EL |
665 | if (li->u.ulog.qthreshold) |
666 | if (qthreshold > li->u.ulog.qthreshold) | |
667 | qthreshold = li->u.ulog.qthreshold; | |
668 | ||
601e68e1 | 669 | |
0597f268 HW |
670 | switch (inst->copy_mode) { |
671 | case NFULNL_COPY_META: | |
672 | case NFULNL_COPY_NONE: | |
673 | data_len = 0; | |
674 | break; | |
601e68e1 | 675 | |
0597f268 | 676 | case NFULNL_COPY_PACKET: |
601e68e1 | 677 | if (inst->copy_range == 0 |
0597f268 HW |
678 | || inst->copy_range > skb->len) |
679 | data_len = skb->len; | |
680 | else | |
681 | data_len = inst->copy_range; | |
601e68e1 | 682 | |
df6fb868 | 683 | size += nla_total_size(data_len); |
0597f268 | 684 | break; |
601e68e1 | 685 | |
f5c5440d | 686 | case NFULNL_COPY_DISABLED: |
0597f268 | 687 | default: |
55b5a91e | 688 | goto unlock_and_release; |
0597f268 HW |
689 | } |
690 | ||
d63b043d MM |
691 | if (inst->skb && |
692 | size > skb_tailroom(inst->skb) - sizeof(struct nfgenmsg)) { | |
0597f268 HW |
693 | /* either the queue len is too high or we don't have |
694 | * enough room in the skb left. flush to userspace. */ | |
e3567061 | 695 | __nfulnl_flush(inst); |
55b5a91e | 696 | } |
0597f268 | 697 | |
55b5a91e MM |
698 | if (!inst->skb) { |
699 | inst->skb = nfulnl_alloc_skb(inst->nlbufsiz, size); | |
700 | if (!inst->skb) | |
0597f268 | 701 | goto alloc_failure; |
0597f268 HW |
702 | } |
703 | ||
0597f268 HW |
704 | inst->qlen++; |
705 | ||
9368a53c | 706 | __build_packet_message(log, inst, skb, data_len, pf, |
8248779b | 707 | hooknum, in, out, prefix, plen); |
0597f268 | 708 | |
d63b043d MM |
709 | if (inst->qlen >= qthreshold) |
710 | __nfulnl_flush(inst); | |
0597f268 HW |
711 | /* timer_pending always called within inst->lock, so there |
712 | * is no chance of a race here */ | |
d63b043d | 713 | else if (!timer_pending(&inst->timer)) { |
0597f268 HW |
714 | instance_get(inst); |
715 | inst->timer.expires = jiffies + (inst->flushtimeout*HZ/100); | |
716 | add_timer(&inst->timer); | |
717 | } | |
0597f268 | 718 | |
ed32abea MM |
719 | unlock_and_release: |
720 | spin_unlock_bh(&inst->lock); | |
721 | instance_put(inst); | |
0597f268 HW |
722 | return; |
723 | ||
724 | alloc_failure: | |
0597f268 | 725 | /* FIXME: statistics */ |
ed32abea | 726 | goto unlock_and_release; |
0597f268 | 727 | } |
5f7340ef | 728 | EXPORT_SYMBOL_GPL(nfulnl_log_packet); |
0597f268 HW |
729 | |
730 | static int | |
731 | nfulnl_rcv_nl_event(struct notifier_block *this, | |
732 | unsigned long event, void *ptr) | |
733 | { | |
734 | struct netlink_notify *n = ptr; | |
9368a53c | 735 | struct nfnl_log_net *log = nfnl_log_pernet(n->net); |
0597f268 | 736 | |
dee5817e | 737 | if (event == NETLINK_URELEASE && n->protocol == NETLINK_NETFILTER) { |
0597f268 HW |
738 | int i; |
739 | ||
15e47304 | 740 | /* destroy all instances for this portid */ |
9368a53c | 741 | spin_lock_bh(&log->instances_lock); |
0597f268 | 742 | for (i = 0; i < INSTANCE_BUCKETS; i++) { |
b67bfe0d | 743 | struct hlist_node *t2; |
0597f268 | 744 | struct nfulnl_instance *inst; |
9368a53c | 745 | struct hlist_head *head = &log->instance_table[i]; |
0597f268 | 746 | |
b67bfe0d | 747 | hlist_for_each_entry_safe(inst, t2, head, hlist) { |
9368a53c | 748 | if (n->portid == inst->peer_portid) |
0597f268 HW |
749 | __instance_destroy(inst); |
750 | } | |
751 | } | |
9368a53c | 752 | spin_unlock_bh(&log->instances_lock); |
0597f268 HW |
753 | } |
754 | return NOTIFY_DONE; | |
755 | } | |
756 | ||
757 | static struct notifier_block nfulnl_rtnl_notifier = { | |
758 | .notifier_call = nfulnl_rcv_nl_event, | |
759 | }; | |
760 | ||
761 | static int | |
762 | nfulnl_recv_unsupp(struct sock *ctnl, struct sk_buff *skb, | |
39938324 PM |
763 | const struct nlmsghdr *nlh, |
764 | const struct nlattr * const nfqa[]) | |
0597f268 HW |
765 | { |
766 | return -ENOTSUPP; | |
767 | } | |
768 | ||
ca735b3a | 769 | static struct nf_logger nfulnl_logger __read_mostly = { |
0597f268 HW |
770 | .name = "nfnetlink_log", |
771 | .logfn = &nfulnl_log_packet, | |
772 | .me = THIS_MODULE, | |
773 | }; | |
774 | ||
fd8281ad PM |
775 | static const struct nla_policy nfula_cfg_policy[NFULA_CFG_MAX+1] = { |
776 | [NFULA_CFG_CMD] = { .len = sizeof(struct nfulnl_msg_config_cmd) }, | |
777 | [NFULA_CFG_MODE] = { .len = sizeof(struct nfulnl_msg_config_mode) }, | |
778 | [NFULA_CFG_TIMEOUT] = { .type = NLA_U32 }, | |
779 | [NFULA_CFG_QTHRESH] = { .type = NLA_U32 }, | |
780 | [NFULA_CFG_NLBUFSIZ] = { .type = NLA_U32 }, | |
781 | [NFULA_CFG_FLAGS] = { .type = NLA_U16 }, | |
0597f268 HW |
782 | }; |
783 | ||
784 | static int | |
785 | nfulnl_recv_config(struct sock *ctnl, struct sk_buff *skb, | |
39938324 PM |
786 | const struct nlmsghdr *nlh, |
787 | const struct nlattr * const nfula[]) | |
0597f268 | 788 | { |
d550d095 | 789 | struct nfgenmsg *nfmsg = nlmsg_data(nlh); |
0597f268 HW |
790 | u_int16_t group_num = ntohs(nfmsg->res_id); |
791 | struct nfulnl_instance *inst; | |
b7047a1c | 792 | struct nfulnl_msg_config_cmd *cmd = NULL; |
30e0c6a6 | 793 | struct net *net = sock_net(ctnl); |
9368a53c | 794 | struct nfnl_log_net *log = nfnl_log_pernet(net); |
0597f268 HW |
795 | int ret = 0; |
796 | ||
b7047a1c PM |
797 | if (nfula[NFULA_CFG_CMD]) { |
798 | u_int8_t pf = nfmsg->nfgen_family; | |
799 | cmd = nla_data(nfula[NFULA_CFG_CMD]); | |
800 | ||
801 | /* Commands without queue context */ | |
802 | switch (cmd->command) { | |
803 | case NFULNL_CFG_CMD_PF_BIND: | |
30e0c6a6 | 804 | return nf_log_bind_pf(net, pf, &nfulnl_logger); |
b7047a1c | 805 | case NFULNL_CFG_CMD_PF_UNBIND: |
30e0c6a6 | 806 | nf_log_unbind_pf(net, pf); |
b7047a1c PM |
807 | return 0; |
808 | } | |
809 | } | |
810 | ||
9368a53c | 811 | inst = instance_lookup_get(log, group_num); |
15e47304 | 812 | if (inst && inst->peer_portid != NETLINK_CB(skb).portid) { |
c0506365 PM |
813 | ret = -EPERM; |
814 | goto out_put; | |
815 | } | |
816 | ||
b7047a1c | 817 | if (cmd != NULL) { |
0597f268 HW |
818 | switch (cmd->command) { |
819 | case NFULNL_CFG_CMD_BIND: | |
820 | if (inst) { | |
821 | ret = -EBUSY; | |
822 | goto out_put; | |
823 | } | |
824 | ||
9368a53c | 825 | inst = instance_create(net, group_num, |
15e47304 | 826 | NETLINK_CB(skb).portid, |
9eea9515 | 827 | sk_user_ns(NETLINK_CB(skb).ssk)); |
baab2ce7 PM |
828 | if (IS_ERR(inst)) { |
829 | ret = PTR_ERR(inst); | |
f414c16c | 830 | goto out; |
0597f268 HW |
831 | } |
832 | break; | |
833 | case NFULNL_CFG_CMD_UNBIND: | |
834 | if (!inst) { | |
835 | ret = -ENODEV; | |
f414c16c | 836 | goto out; |
0597f268 HW |
837 | } |
838 | ||
9368a53c | 839 | instance_destroy(log, inst); |
a49c6503 | 840 | goto out_put; |
0597f268 | 841 | default: |
cd21f0ac | 842 | ret = -ENOTSUPP; |
0597f268 HW |
843 | break; |
844 | } | |
0597f268 HW |
845 | } |
846 | ||
df6fb868 | 847 | if (nfula[NFULA_CFG_MODE]) { |
0597f268 | 848 | struct nfulnl_msg_config_mode *params; |
df6fb868 | 849 | params = nla_data(nfula[NFULA_CFG_MODE]); |
0597f268 | 850 | |
c0506365 PM |
851 | if (!inst) { |
852 | ret = -ENODEV; | |
853 | goto out; | |
854 | } | |
0597f268 | 855 | nfulnl_set_mode(inst, params->copy_mode, |
d1208b99 | 856 | ntohl(params->copy_range)); |
0597f268 HW |
857 | } |
858 | ||
df6fb868 | 859 | if (nfula[NFULA_CFG_TIMEOUT]) { |
0dfedd28 | 860 | __be32 timeout = nla_get_be32(nfula[NFULA_CFG_TIMEOUT]); |
0597f268 | 861 | |
c0506365 PM |
862 | if (!inst) { |
863 | ret = -ENODEV; | |
864 | goto out; | |
865 | } | |
0597f268 HW |
866 | nfulnl_set_timeout(inst, ntohl(timeout)); |
867 | } | |
868 | ||
df6fb868 | 869 | if (nfula[NFULA_CFG_NLBUFSIZ]) { |
0dfedd28 | 870 | __be32 nlbufsiz = nla_get_be32(nfula[NFULA_CFG_NLBUFSIZ]); |
0597f268 | 871 | |
c0506365 PM |
872 | if (!inst) { |
873 | ret = -ENODEV; | |
874 | goto out; | |
875 | } | |
0597f268 HW |
876 | nfulnl_set_nlbufsiz(inst, ntohl(nlbufsiz)); |
877 | } | |
878 | ||
df6fb868 | 879 | if (nfula[NFULA_CFG_QTHRESH]) { |
0dfedd28 | 880 | __be32 qthresh = nla_get_be32(nfula[NFULA_CFG_QTHRESH]); |
0597f268 | 881 | |
c0506365 PM |
882 | if (!inst) { |
883 | ret = -ENODEV; | |
884 | goto out; | |
885 | } | |
0597f268 HW |
886 | nfulnl_set_qthresh(inst, ntohl(qthresh)); |
887 | } | |
888 | ||
df6fb868 | 889 | if (nfula[NFULA_CFG_FLAGS]) { |
0dfedd28 | 890 | __be16 flags = nla_get_be16(nfula[NFULA_CFG_FLAGS]); |
c0506365 PM |
891 | |
892 | if (!inst) { | |
893 | ret = -ENODEV; | |
894 | goto out; | |
895 | } | |
ee433530 | 896 | nfulnl_set_flags(inst, ntohs(flags)); |
0af5f6c1 HW |
897 | } |
898 | ||
0597f268 HW |
899 | out_put: |
900 | instance_put(inst); | |
dd16704e | 901 | out: |
0597f268 HW |
902 | return ret; |
903 | } | |
904 | ||
7c8d4cb4 | 905 | static const struct nfnl_callback nfulnl_cb[NFULNL_MSG_MAX] = { |
0597f268 | 906 | [NFULNL_MSG_PACKET] = { .call = nfulnl_recv_unsupp, |
37d2e7a2 | 907 | .attr_count = NFULA_MAX, }, |
0597f268 | 908 | [NFULNL_MSG_CONFIG] = { .call = nfulnl_recv_config, |
fd8281ad PM |
909 | .attr_count = NFULA_CFG_MAX, |
910 | .policy = nfula_cfg_policy }, | |
0597f268 HW |
911 | }; |
912 | ||
7c8d4cb4 | 913 | static const struct nfnetlink_subsystem nfulnl_subsys = { |
0597f268 HW |
914 | .name = "log", |
915 | .subsys_id = NFNL_SUBSYS_ULOG, | |
916 | .cb_count = NFULNL_MSG_MAX, | |
0597f268 HW |
917 | .cb = nfulnl_cb, |
918 | }; | |
919 | ||
920 | #ifdef CONFIG_PROC_FS | |
921 | struct iter_state { | |
9368a53c | 922 | struct seq_net_private p; |
0597f268 HW |
923 | unsigned int bucket; |
924 | }; | |
925 | ||
9368a53c | 926 | static struct hlist_node *get_first(struct net *net, struct iter_state *st) |
0597f268 | 927 | { |
9368a53c | 928 | struct nfnl_log_net *log; |
0597f268 HW |
929 | if (!st) |
930 | return NULL; | |
931 | ||
9368a53c G |
932 | log = nfnl_log_pernet(net); |
933 | ||
0597f268 | 934 | for (st->bucket = 0; st->bucket < INSTANCE_BUCKETS; st->bucket++) { |
9368a53c G |
935 | struct hlist_head *head = &log->instance_table[st->bucket]; |
936 | ||
937 | if (!hlist_empty(head)) | |
938 | return rcu_dereference_bh(hlist_first_rcu(head)); | |
0597f268 HW |
939 | } |
940 | return NULL; | |
941 | } | |
942 | ||
9368a53c G |
943 | static struct hlist_node *get_next(struct net *net, struct iter_state *st, |
944 | struct hlist_node *h) | |
0597f268 | 945 | { |
0e60ebe0 | 946 | h = rcu_dereference_bh(hlist_next_rcu(h)); |
0597f268 | 947 | while (!h) { |
9368a53c G |
948 | struct nfnl_log_net *log; |
949 | struct hlist_head *head; | |
950 | ||
0597f268 HW |
951 | if (++st->bucket >= INSTANCE_BUCKETS) |
952 | return NULL; | |
953 | ||
9368a53c G |
954 | log = nfnl_log_pernet(net); |
955 | head = &log->instance_table[st->bucket]; | |
956 | h = rcu_dereference_bh(hlist_first_rcu(head)); | |
0597f268 HW |
957 | } |
958 | return h; | |
959 | } | |
960 | ||
9368a53c G |
961 | static struct hlist_node *get_idx(struct net *net, struct iter_state *st, |
962 | loff_t pos) | |
0597f268 HW |
963 | { |
964 | struct hlist_node *head; | |
9368a53c | 965 | head = get_first(net, st); |
0597f268 HW |
966 | |
967 | if (head) | |
9368a53c | 968 | while (pos && (head = get_next(net, st, head))) |
0597f268 HW |
969 | pos--; |
970 | return pos ? NULL : head; | |
971 | } | |
972 | ||
9368a53c | 973 | static void *seq_start(struct seq_file *s, loff_t *pos) |
bed1be20 | 974 | __acquires(rcu_bh) |
0597f268 | 975 | { |
bed1be20 | 976 | rcu_read_lock_bh(); |
9368a53c | 977 | return get_idx(seq_file_net(s), s->private, *pos); |
0597f268 HW |
978 | } |
979 | ||
980 | static void *seq_next(struct seq_file *s, void *v, loff_t *pos) | |
981 | { | |
982 | (*pos)++; | |
9368a53c | 983 | return get_next(seq_file_net(s), s->private, v); |
0597f268 HW |
984 | } |
985 | ||
986 | static void seq_stop(struct seq_file *s, void *v) | |
bed1be20 | 987 | __releases(rcu_bh) |
0597f268 | 988 | { |
bed1be20 | 989 | rcu_read_unlock_bh(); |
0597f268 HW |
990 | } |
991 | ||
992 | static int seq_show(struct seq_file *s, void *v) | |
993 | { | |
994 | const struct nfulnl_instance *inst = v; | |
995 | ||
601e68e1 | 996 | return seq_printf(s, "%5d %6d %5d %1d %5d %6d %2d\n", |
0597f268 | 997 | inst->group_num, |
15e47304 | 998 | inst->peer_portid, inst->qlen, |
0597f268 HW |
999 | inst->copy_mode, inst->copy_range, |
1000 | inst->flushtimeout, atomic_read(&inst->use)); | |
1001 | } | |
1002 | ||
56b3d975 | 1003 | static const struct seq_operations nful_seq_ops = { |
0597f268 HW |
1004 | .start = seq_start, |
1005 | .next = seq_next, | |
1006 | .stop = seq_stop, | |
1007 | .show = seq_show, | |
1008 | }; | |
1009 | ||
1010 | static int nful_open(struct inode *inode, struct file *file) | |
1011 | { | |
9368a53c G |
1012 | return seq_open_net(inode, file, &nful_seq_ops, |
1013 | sizeof(struct iter_state)); | |
0597f268 HW |
1014 | } |
1015 | ||
da7071d7 | 1016 | static const struct file_operations nful_file_ops = { |
0597f268 HW |
1017 | .owner = THIS_MODULE, |
1018 | .open = nful_open, | |
1019 | .read = seq_read, | |
1020 | .llseek = seq_lseek, | |
9368a53c | 1021 | .release = seq_release_net, |
0597f268 HW |
1022 | }; |
1023 | ||
1024 | #endif /* PROC_FS */ | |
1025 | ||
9368a53c | 1026 | static int __net_init nfnl_log_net_init(struct net *net) |
0597f268 | 1027 | { |
9368a53c G |
1028 | unsigned int i; |
1029 | struct nfnl_log_net *log = nfnl_log_pernet(net); | |
601e68e1 | 1030 | |
0597f268 | 1031 | for (i = 0; i < INSTANCE_BUCKETS; i++) |
9368a53c G |
1032 | INIT_HLIST_HEAD(&log->instance_table[i]); |
1033 | spin_lock_init(&log->instances_lock); | |
1034 | ||
1035 | #ifdef CONFIG_PROC_FS | |
1036 | if (!proc_create("nfnetlink_log", 0440, | |
1037 | net->nf.proc_netfilter, &nful_file_ops)) | |
1038 | return -ENOMEM; | |
1039 | #endif | |
1040 | return 0; | |
1041 | } | |
1042 | ||
1043 | static void __net_exit nfnl_log_net_exit(struct net *net) | |
1044 | { | |
1045 | remove_proc_entry("nfnetlink_log", net->nf.proc_netfilter); | |
1046 | } | |
1047 | ||
1048 | static struct pernet_operations nfnl_log_net_ops = { | |
1049 | .init = nfnl_log_net_init, | |
1050 | .exit = nfnl_log_net_exit, | |
1051 | .id = &nfnl_log_net_id, | |
1052 | .size = sizeof(struct nfnl_log_net), | |
1053 | }; | |
1054 | ||
1055 | static int __init nfnetlink_log_init(void) | |
1056 | { | |
1057 | int status = -ENOMEM; | |
601e68e1 | 1058 | |
0597f268 HW |
1059 | /* it's not really all that important to have a random value, so |
1060 | * we can do this from the init function, even if there hasn't | |
1061 | * been that much entropy yet */ | |
1062 | get_random_bytes(&hash_init, sizeof(hash_init)); | |
1063 | ||
1064 | netlink_register_notifier(&nfulnl_rtnl_notifier); | |
1065 | status = nfnetlink_subsys_register(&nfulnl_subsys); | |
1066 | if (status < 0) { | |
9368a53c | 1067 | pr_err("log: failed to create netlink socket\n"); |
0597f268 HW |
1068 | goto cleanup_netlink_notifier; |
1069 | } | |
1070 | ||
ca735b3a EL |
1071 | status = nf_log_register(NFPROTO_UNSPEC, &nfulnl_logger); |
1072 | if (status < 0) { | |
9368a53c | 1073 | pr_err("log: failed to register logger\n"); |
ca735b3a EL |
1074 | goto cleanup_subsys; |
1075 | } | |
1076 | ||
9368a53c G |
1077 | status = register_pernet_subsys(&nfnl_log_net_ops); |
1078 | if (status < 0) { | |
1079 | pr_err("log: failed to register pernet ops\n"); | |
ca735b3a | 1080 | goto cleanup_logger; |
6fc09f10 | 1081 | } |
0597f268 HW |
1082 | return status; |
1083 | ||
ca735b3a EL |
1084 | cleanup_logger: |
1085 | nf_log_unregister(&nfulnl_logger); | |
0597f268 | 1086 | cleanup_subsys: |
0597f268 HW |
1087 | nfnetlink_subsys_unregister(&nfulnl_subsys); |
1088 | cleanup_netlink_notifier: | |
1089 | netlink_unregister_notifier(&nfulnl_rtnl_notifier); | |
1090 | return status; | |
1091 | } | |
1092 | ||
65b4b4e8 | 1093 | static void __exit nfnetlink_log_fini(void) |
0597f268 | 1094 | { |
9368a53c | 1095 | unregister_pernet_subsys(&nfnl_log_net_ops); |
e92ad99c | 1096 | nf_log_unregister(&nfulnl_logger); |
32292a7f PM |
1097 | nfnetlink_subsys_unregister(&nfulnl_subsys); |
1098 | netlink_unregister_notifier(&nfulnl_rtnl_notifier); | |
0597f268 HW |
1099 | } |
1100 | ||
1101 | MODULE_DESCRIPTION("netfilter userspace logging"); | |
1102 | MODULE_AUTHOR("Harald Welte <laforge@netfilter.org>"); | |
1103 | MODULE_LICENSE("GPL"); | |
f682faef | 1104 | MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_ULOG); |
0597f268 | 1105 | |
65b4b4e8 AM |
1106 | module_init(nfnetlink_log_init); |
1107 | module_exit(nfnetlink_log_fini); |