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 * |
3ab1f683 | 322 | nfulnl_alloc_skb(u32 peer_portid, unsigned int inst_size, unsigned int pkt_size) |
0597f268 HW |
323 | { |
324 | struct sk_buff *skb; | |
ad2ad0f9 | 325 | unsigned int n; |
0597f268 | 326 | |
0597f268 HW |
327 | /* alloc skb which should be big enough for a whole multipart |
328 | * message. WARNING: has to be <= 128k due to slab restrictions */ | |
329 | ||
ad2ad0f9 | 330 | n = max(inst_size, pkt_size); |
3ab1f683 | 331 | skb = nfnetlink_alloc_skb(&init_net, n, peer_portid, GFP_ATOMIC); |
0597f268 | 332 | if (!skb) { |
ad2ad0f9 PM |
333 | if (n > pkt_size) { |
334 | /* try to allocate only as much as we need for current | |
335 | * packet */ | |
0597f268 | 336 | |
3ab1f683 PM |
337 | skb = nfnetlink_alloc_skb(&init_net, pkt_size, |
338 | peer_portid, GFP_ATOMIC); | |
ad2ad0f9 | 339 | if (!skb) |
0a9ee813 JP |
340 | pr_err("nfnetlink_log: can't even alloc %u bytes\n", |
341 | pkt_size); | |
ad2ad0f9 | 342 | } |
0597f268 HW |
343 | } |
344 | ||
345 | return skb; | |
346 | } | |
347 | ||
348 | static int | |
349 | __nfulnl_send(struct nfulnl_instance *inst) | |
350 | { | |
29c5d4af | 351 | int status = -1; |
0597f268 | 352 | |
d550d095 DM |
353 | if (inst->qlen > 1) { |
354 | struct nlmsghdr *nlh = nlmsg_put(inst->skb, 0, 0, | |
355 | NLMSG_DONE, | |
356 | sizeof(struct nfgenmsg), | |
357 | 0); | |
358 | if (!nlh) | |
359 | goto out; | |
360 | } | |
9368a53c | 361 | status = nfnetlink_unicast(inst->skb, inst->net, inst->peer_portid, |
cd8c20b6 | 362 | MSG_DONTWAIT); |
0597f268 HW |
363 | |
364 | inst->qlen = 0; | |
365 | inst->skb = NULL; | |
d550d095 | 366 | out: |
0597f268 HW |
367 | return status; |
368 | } | |
369 | ||
e3567061 MM |
370 | static void |
371 | __nfulnl_flush(struct nfulnl_instance *inst) | |
372 | { | |
373 | /* timer holds a reference */ | |
374 | if (del_timer(&inst->timer)) | |
375 | instance_put(inst); | |
376 | if (inst->skb) | |
377 | __nfulnl_send(inst); | |
378 | } | |
379 | ||
c6a8f648 MM |
380 | static void |
381 | nfulnl_timer(unsigned long data) | |
0597f268 | 382 | { |
601e68e1 | 383 | struct nfulnl_instance *inst = (struct nfulnl_instance *)data; |
0597f268 | 384 | |
0597f268 | 385 | spin_lock_bh(&inst->lock); |
370e6a87 MM |
386 | if (inst->skb) |
387 | __nfulnl_send(inst); | |
0597f268 | 388 | spin_unlock_bh(&inst->lock); |
05f7b7b3 | 389 | instance_put(inst); |
0597f268 HW |
390 | } |
391 | ||
0af5f6c1 HW |
392 | /* This is an inline function, we don't really care about a long |
393 | * list of arguments */ | |
601e68e1 | 394 | static inline int |
9368a53c G |
395 | __build_packet_message(struct nfnl_log_net *log, |
396 | struct nfulnl_instance *inst, | |
601e68e1 | 397 | const struct sk_buff *skb, |
0597f268 | 398 | unsigned int data_len, |
76108cea | 399 | u_int8_t pf, |
0597f268 HW |
400 | unsigned int hooknum, |
401 | const struct net_device *indev, | |
402 | const struct net_device *outdev, | |
d7a5c324 | 403 | const char *prefix, unsigned int plen) |
0597f268 | 404 | { |
0597f268 HW |
405 | struct nfulnl_msg_packet_hdr pmsg; |
406 | struct nlmsghdr *nlh; | |
407 | struct nfgenmsg *nfmsg; | |
27a884dc | 408 | sk_buff_data_t old_tail = inst->skb->tail; |
0626af31 | 409 | struct sock *sk; |
0c36b48b | 410 | const unsigned char *hwhdrp; |
0597f268 | 411 | |
d550d095 | 412 | nlh = nlmsg_put(inst->skb, 0, 0, |
0597f268 | 413 | NFNL_SUBSYS_ULOG << 8 | NFULNL_MSG_PACKET, |
d550d095 DM |
414 | sizeof(struct nfgenmsg), 0); |
415 | if (!nlh) | |
416 | return -1; | |
417 | nfmsg = nlmsg_data(nlh); | |
0597f268 HW |
418 | nfmsg->nfgen_family = pf; |
419 | nfmsg->version = NFNETLINK_V0; | |
420 | nfmsg->res_id = htons(inst->group_num); | |
421 | ||
febf0a43 | 422 | pmsg.hw_protocol = skb->protocol; |
0597f268 HW |
423 | pmsg.hook = hooknum; |
424 | ||
1db20a52 DM |
425 | if (nla_put(inst->skb, NFULA_PACKET_HDR, sizeof(pmsg), &pmsg)) |
426 | goto nla_put_failure; | |
0597f268 | 427 | |
1db20a52 DM |
428 | if (prefix && |
429 | nla_put(inst->skb, NFULA_PREFIX, plen, prefix)) | |
430 | goto nla_put_failure; | |
0597f268 HW |
431 | |
432 | if (indev) { | |
fbcd923c | 433 | #ifndef CONFIG_BRIDGE_NETFILTER |
1db20a52 DM |
434 | if (nla_put_be32(inst->skb, NFULA_IFINDEX_INDEV, |
435 | htonl(indev->ifindex))) | |
436 | goto nla_put_failure; | |
fbcd923c HW |
437 | #else |
438 | if (pf == PF_BRIDGE) { | |
439 | /* Case 1: outdev is physical input device, we need to | |
440 | * look for bridge group (when called from | |
441 | * netfilter_bridge) */ | |
1db20a52 DM |
442 | if (nla_put_be32(inst->skb, NFULA_IFINDEX_PHYSINDEV, |
443 | htonl(indev->ifindex)) || | |
fbcd923c | 444 | /* this is the bridge group "brX" */ |
f350a0a8 | 445 | /* rcu_read_lock()ed by nf_hook_slow or nf_log_packet */ |
1db20a52 DM |
446 | nla_put_be32(inst->skb, NFULA_IFINDEX_INDEV, |
447 | htonl(br_port_get_rcu(indev)->br->dev->ifindex))) | |
448 | goto nla_put_failure; | |
fbcd923c HW |
449 | } else { |
450 | /* Case 2: indev is bridge group, we need to look for | |
451 | * physical device (when called from ipv4) */ | |
1db20a52 DM |
452 | if (nla_put_be32(inst->skb, NFULA_IFINDEX_INDEV, |
453 | htonl(indev->ifindex))) | |
454 | goto nla_put_failure; | |
455 | if (skb->nf_bridge && skb->nf_bridge->physindev && | |
456 | nla_put_be32(inst->skb, NFULA_IFINDEX_PHYSINDEV, | |
457 | htonl(skb->nf_bridge->physindev->ifindex))) | |
458 | goto nla_put_failure; | |
fbcd923c HW |
459 | } |
460 | #endif | |
0597f268 HW |
461 | } |
462 | ||
463 | if (outdev) { | |
fbcd923c | 464 | #ifndef CONFIG_BRIDGE_NETFILTER |
1db20a52 DM |
465 | if (nla_put_be32(inst->skb, NFULA_IFINDEX_OUTDEV, |
466 | htonl(outdev->ifindex))) | |
467 | goto nla_put_failure; | |
fbcd923c HW |
468 | #else |
469 | if (pf == PF_BRIDGE) { | |
470 | /* Case 1: outdev is physical output device, we need to | |
471 | * look for bridge group (when called from | |
472 | * netfilter_bridge) */ | |
1db20a52 DM |
473 | if (nla_put_be32(inst->skb, NFULA_IFINDEX_PHYSOUTDEV, |
474 | htonl(outdev->ifindex)) || | |
fbcd923c | 475 | /* this is the bridge group "brX" */ |
f350a0a8 | 476 | /* rcu_read_lock()ed by nf_hook_slow or nf_log_packet */ |
1db20a52 DM |
477 | nla_put_be32(inst->skb, NFULA_IFINDEX_OUTDEV, |
478 | htonl(br_port_get_rcu(outdev)->br->dev->ifindex))) | |
479 | goto nla_put_failure; | |
fbcd923c HW |
480 | } else { |
481 | /* Case 2: indev is a bridge group, we need to look | |
482 | * for physical device (when called from ipv4) */ | |
1db20a52 DM |
483 | if (nla_put_be32(inst->skb, NFULA_IFINDEX_OUTDEV, |
484 | htonl(outdev->ifindex))) | |
485 | goto nla_put_failure; | |
486 | if (skb->nf_bridge && skb->nf_bridge->physoutdev && | |
487 | nla_put_be32(inst->skb, NFULA_IFINDEX_PHYSOUTDEV, | |
488 | htonl(skb->nf_bridge->physoutdev->ifindex))) | |
489 | goto nla_put_failure; | |
fbcd923c HW |
490 | } |
491 | #endif | |
0597f268 HW |
492 | } |
493 | ||
1db20a52 DM |
494 | if (skb->mark && |
495 | nla_put_be32(inst->skb, NFULA_MARK, htonl(skb->mark))) | |
496 | goto nla_put_failure; | |
0597f268 | 497 | |
2c38de4c NC |
498 | if (indev && skb->dev && |
499 | skb->mac_header != skb->network_header) { | |
0597f268 | 500 | struct nfulnl_msg_packet_hw phw; |
b95cce35 SH |
501 | int len = dev_parse_header(skb, phw.hw_addr); |
502 | if (len > 0) { | |
503 | phw.hw_addrlen = htons(len); | |
1db20a52 DM |
504 | if (nla_put(inst->skb, NFULA_HWADDR, sizeof(phw), &phw)) |
505 | goto nla_put_failure; | |
b95cce35 | 506 | } |
0597f268 HW |
507 | } |
508 | ||
72961ecf | 509 | if (indev && skb_mac_header_was_set(skb)) { |
2dba62c3 | 510 | if (nla_put_be16(inst->skb, NFULA_HWTYPE, htons(skb->dev->type)) || |
1db20a52 | 511 | nla_put_be16(inst->skb, NFULA_HWLEN, |
0c36b48b BH |
512 | htons(skb->dev->hard_header_len))) |
513 | goto nla_put_failure; | |
514 | ||
515 | hwhdrp = skb_mac_header(skb); | |
516 | ||
517 | if (skb->dev->type == ARPHRD_SIT) | |
518 | hwhdrp -= ETH_HLEN; | |
519 | ||
520 | if (hwhdrp >= skb->head && | |
521 | nla_put(inst->skb, NFULA_HWHEADER, | |
522 | skb->dev->hard_header_len, hwhdrp)) | |
1db20a52 | 523 | goto nla_put_failure; |
72961ecf EL |
524 | } |
525 | ||
b7aa0bf7 | 526 | if (skb->tstamp.tv64) { |
0597f268 | 527 | struct nfulnl_msg_packet_timestamp ts; |
b7aa0bf7 ED |
528 | struct timeval tv = ktime_to_timeval(skb->tstamp); |
529 | ts.sec = cpu_to_be64(tv.tv_sec); | |
530 | ts.usec = cpu_to_be64(tv.tv_usec); | |
0597f268 | 531 | |
1db20a52 DM |
532 | if (nla_put(inst->skb, NFULA_TIMESTAMP, sizeof(ts), &ts)) |
533 | goto nla_put_failure; | |
0597f268 HW |
534 | } |
535 | ||
536 | /* UID */ | |
0626af31 ED |
537 | sk = skb->sk; |
538 | if (sk && sk->sk_state != TCP_TIME_WAIT) { | |
539 | read_lock_bh(&sk->sk_callback_lock); | |
540 | if (sk->sk_socket && sk->sk_socket->file) { | |
541 | struct file *file = sk->sk_socket->file; | |
437589a7 LT |
542 | const struct cred *cred = file->f_cred; |
543 | struct user_namespace *user_ns = inst->peer_user_ns; | |
544 | __be32 uid = htonl(from_kuid_munged(user_ns, cred->fsuid)); | |
545 | __be32 gid = htonl(from_kgid_munged(user_ns, cred->fsgid)); | |
0626af31 | 546 | read_unlock_bh(&sk->sk_callback_lock); |
1db20a52 DM |
547 | if (nla_put_be32(inst->skb, NFULA_UID, uid) || |
548 | nla_put_be32(inst->skb, NFULA_GID, gid)) | |
549 | goto nla_put_failure; | |
0597f268 | 550 | } else |
0626af31 | 551 | read_unlock_bh(&sk->sk_callback_lock); |
0597f268 HW |
552 | } |
553 | ||
0af5f6c1 | 554 | /* local sequence number */ |
1db20a52 DM |
555 | if ((inst->flags & NFULNL_CFG_F_SEQ) && |
556 | nla_put_be32(inst->skb, NFULA_SEQ, htonl(inst->seq++))) | |
557 | goto nla_put_failure; | |
0dfedd28 | 558 | |
0af5f6c1 | 559 | /* global sequence number */ |
1db20a52 DM |
560 | if ((inst->flags & NFULNL_CFG_F_SEQ_GLOBAL) && |
561 | nla_put_be32(inst->skb, NFULA_SEQ_GLOBAL, | |
9368a53c | 562 | htonl(atomic_inc_return(&log->global_seq)))) |
1db20a52 | 563 | goto nla_put_failure; |
0af5f6c1 | 564 | |
0597f268 | 565 | if (data_len) { |
df6fb868 PM |
566 | struct nlattr *nla; |
567 | int size = nla_attr_size(data_len); | |
0597f268 | 568 | |
df6fb868 | 569 | if (skb_tailroom(inst->skb) < nla_total_size(data_len)) { |
0597f268 | 570 | printk(KERN_WARNING "nfnetlink_log: no tailroom!\n"); |
d550d095 | 571 | return -1; |
0597f268 HW |
572 | } |
573 | ||
df6fb868 PM |
574 | nla = (struct nlattr *)skb_put(inst->skb, nla_total_size(data_len)); |
575 | nla->nla_type = NFULA_PAYLOAD; | |
576 | nla->nla_len = size; | |
0597f268 | 577 | |
df6fb868 | 578 | if (skb_copy_bits(skb, 0, nla_data(nla), data_len)) |
0597f268 HW |
579 | BUG(); |
580 | } | |
601e68e1 | 581 | |
0597f268 HW |
582 | nlh->nlmsg_len = inst->skb->tail - old_tail; |
583 | return 0; | |
584 | ||
df6fb868 | 585 | nla_put_failure: |
0597f268 HW |
586 | PRINTR(KERN_ERR "nfnetlink_log: error creating log nlmsg\n"); |
587 | return -1; | |
588 | } | |
589 | ||
590 | #define RCV_SKB_FAIL(err) do { netlink_ack(skb, nlh, (err)); return; } while (0) | |
591 | ||
592 | static struct nf_loginfo default_loginfo = { | |
593 | .type = NF_LOG_TYPE_ULOG, | |
594 | .u = { | |
595 | .ulog = { | |
596 | .copy_len = 0xffff, | |
597 | .group = 0, | |
598 | .qthreshold = 1, | |
599 | }, | |
600 | }, | |
601 | }; | |
602 | ||
603 | /* log handler for internal netfilter logging api */ | |
5f7340ef | 604 | void |
8cdb46da HS |
605 | nfulnl_log_packet(struct net *net, |
606 | u_int8_t pf, | |
0597f268 HW |
607 | unsigned int hooknum, |
608 | const struct sk_buff *skb, | |
609 | const struct net_device *in, | |
610 | const struct net_device *out, | |
611 | const struct nf_loginfo *li_user, | |
612 | const char *prefix) | |
613 | { | |
614 | unsigned int size, data_len; | |
615 | struct nfulnl_instance *inst; | |
616 | const struct nf_loginfo *li; | |
617 | unsigned int qthreshold; | |
d7a5c324 | 618 | unsigned int plen; |
9368a53c | 619 | struct nfnl_log_net *log = nfnl_log_pernet(net); |
0597f268 | 620 | |
601e68e1 | 621 | if (li_user && li_user->type == NF_LOG_TYPE_ULOG) |
0597f268 HW |
622 | li = li_user; |
623 | else | |
624 | li = &default_loginfo; | |
625 | ||
9368a53c | 626 | inst = instance_lookup_get(log, li->u.ulog.group); |
0597f268 | 627 | if (!inst) |
0597f268 | 628 | return; |
0597f268 | 629 | |
d7a5c324 PM |
630 | plen = 0; |
631 | if (prefix) | |
881dbfe8 | 632 | plen = strlen(prefix) + 1; |
d7a5c324 | 633 | |
0597f268 HW |
634 | /* FIXME: do we want to make the size calculation conditional based on |
635 | * what is actually present? way more branches and checks, but more | |
636 | * memory efficient... */ | |
573ce260 | 637 | size = nlmsg_total_size(sizeof(struct nfgenmsg)) |
df6fb868 PM |
638 | + nla_total_size(sizeof(struct nfulnl_msg_packet_hdr)) |
639 | + nla_total_size(sizeof(u_int32_t)) /* ifindex */ | |
640 | + nla_total_size(sizeof(u_int32_t)) /* ifindex */ | |
fbcd923c | 641 | #ifdef CONFIG_BRIDGE_NETFILTER |
df6fb868 PM |
642 | + nla_total_size(sizeof(u_int32_t)) /* ifindex */ |
643 | + nla_total_size(sizeof(u_int32_t)) /* ifindex */ | |
fbcd923c | 644 | #endif |
df6fb868 PM |
645 | + nla_total_size(sizeof(u_int32_t)) /* mark */ |
646 | + nla_total_size(sizeof(u_int32_t)) /* uid */ | |
76aa1ce1 | 647 | + nla_total_size(sizeof(u_int32_t)) /* gid */ |
df6fb868 PM |
648 | + nla_total_size(plen) /* prefix */ |
649 | + nla_total_size(sizeof(struct nfulnl_msg_packet_hw)) | |
650 | + nla_total_size(sizeof(struct nfulnl_msg_packet_timestamp)); | |
0597f268 | 651 | |
eeff9bee PNA |
652 | if (in && skb_mac_header_was_set(skb)) { |
653 | size += nla_total_size(skb->dev->hard_header_len) | |
654 | + nla_total_size(sizeof(u_int16_t)) /* hwtype */ | |
655 | + nla_total_size(sizeof(u_int16_t)); /* hwlen */ | |
656 | } | |
657 | ||
0597f268 HW |
658 | spin_lock_bh(&inst->lock); |
659 | ||
0af5f6c1 | 660 | if (inst->flags & NFULNL_CFG_F_SEQ) |
df6fb868 | 661 | size += nla_total_size(sizeof(u_int32_t)); |
0af5f6c1 | 662 | if (inst->flags & NFULNL_CFG_F_SEQ_GLOBAL) |
df6fb868 | 663 | size += nla_total_size(sizeof(u_int32_t)); |
0af5f6c1 | 664 | |
0597f268 HW |
665 | qthreshold = inst->qthreshold; |
666 | /* per-rule qthreshold overrides per-instance */ | |
5ca431f9 EL |
667 | if (li->u.ulog.qthreshold) |
668 | if (qthreshold > li->u.ulog.qthreshold) | |
669 | qthreshold = li->u.ulog.qthreshold; | |
670 | ||
601e68e1 | 671 | |
0597f268 HW |
672 | switch (inst->copy_mode) { |
673 | case NFULNL_COPY_META: | |
674 | case NFULNL_COPY_NONE: | |
675 | data_len = 0; | |
676 | break; | |
601e68e1 | 677 | |
0597f268 | 678 | case NFULNL_COPY_PACKET: |
601e68e1 | 679 | if (inst->copy_range == 0 |
0597f268 HW |
680 | || inst->copy_range > skb->len) |
681 | data_len = skb->len; | |
682 | else | |
683 | data_len = inst->copy_range; | |
601e68e1 | 684 | |
df6fb868 | 685 | size += nla_total_size(data_len); |
0597f268 | 686 | break; |
601e68e1 | 687 | |
f5c5440d | 688 | case NFULNL_COPY_DISABLED: |
0597f268 | 689 | default: |
55b5a91e | 690 | goto unlock_and_release; |
0597f268 HW |
691 | } |
692 | ||
d63b043d MM |
693 | if (inst->skb && |
694 | size > skb_tailroom(inst->skb) - sizeof(struct nfgenmsg)) { | |
0597f268 HW |
695 | /* either the queue len is too high or we don't have |
696 | * enough room in the skb left. flush to userspace. */ | |
e3567061 | 697 | __nfulnl_flush(inst); |
55b5a91e | 698 | } |
0597f268 | 699 | |
55b5a91e | 700 | if (!inst->skb) { |
3ab1f683 PM |
701 | inst->skb = nfulnl_alloc_skb(inst->peer_portid, inst->nlbufsiz, |
702 | size); | |
55b5a91e | 703 | if (!inst->skb) |
0597f268 | 704 | goto alloc_failure; |
0597f268 HW |
705 | } |
706 | ||
0597f268 HW |
707 | inst->qlen++; |
708 | ||
9368a53c | 709 | __build_packet_message(log, inst, skb, data_len, pf, |
8248779b | 710 | hooknum, in, out, prefix, plen); |
0597f268 | 711 | |
d63b043d MM |
712 | if (inst->qlen >= qthreshold) |
713 | __nfulnl_flush(inst); | |
0597f268 HW |
714 | /* timer_pending always called within inst->lock, so there |
715 | * is no chance of a race here */ | |
d63b043d | 716 | else if (!timer_pending(&inst->timer)) { |
0597f268 HW |
717 | instance_get(inst); |
718 | inst->timer.expires = jiffies + (inst->flushtimeout*HZ/100); | |
719 | add_timer(&inst->timer); | |
720 | } | |
0597f268 | 721 | |
ed32abea MM |
722 | unlock_and_release: |
723 | spin_unlock_bh(&inst->lock); | |
724 | instance_put(inst); | |
0597f268 HW |
725 | return; |
726 | ||
727 | alloc_failure: | |
0597f268 | 728 | /* FIXME: statistics */ |
ed32abea | 729 | goto unlock_and_release; |
0597f268 | 730 | } |
5f7340ef | 731 | EXPORT_SYMBOL_GPL(nfulnl_log_packet); |
0597f268 HW |
732 | |
733 | static int | |
734 | nfulnl_rcv_nl_event(struct notifier_block *this, | |
735 | unsigned long event, void *ptr) | |
736 | { | |
737 | struct netlink_notify *n = ptr; | |
9368a53c | 738 | struct nfnl_log_net *log = nfnl_log_pernet(n->net); |
0597f268 | 739 | |
dee5817e | 740 | if (event == NETLINK_URELEASE && n->protocol == NETLINK_NETFILTER) { |
0597f268 HW |
741 | int i; |
742 | ||
15e47304 | 743 | /* destroy all instances for this portid */ |
9368a53c | 744 | spin_lock_bh(&log->instances_lock); |
0597f268 | 745 | for (i = 0; i < INSTANCE_BUCKETS; i++) { |
b67bfe0d | 746 | struct hlist_node *t2; |
0597f268 | 747 | struct nfulnl_instance *inst; |
9368a53c | 748 | struct hlist_head *head = &log->instance_table[i]; |
0597f268 | 749 | |
b67bfe0d | 750 | hlist_for_each_entry_safe(inst, t2, head, hlist) { |
9368a53c | 751 | if (n->portid == inst->peer_portid) |
0597f268 HW |
752 | __instance_destroy(inst); |
753 | } | |
754 | } | |
9368a53c | 755 | spin_unlock_bh(&log->instances_lock); |
0597f268 HW |
756 | } |
757 | return NOTIFY_DONE; | |
758 | } | |
759 | ||
760 | static struct notifier_block nfulnl_rtnl_notifier = { | |
761 | .notifier_call = nfulnl_rcv_nl_event, | |
762 | }; | |
763 | ||
764 | static int | |
765 | nfulnl_recv_unsupp(struct sock *ctnl, struct sk_buff *skb, | |
39938324 PM |
766 | const struct nlmsghdr *nlh, |
767 | const struct nlattr * const nfqa[]) | |
0597f268 HW |
768 | { |
769 | return -ENOTSUPP; | |
770 | } | |
771 | ||
ca735b3a | 772 | static struct nf_logger nfulnl_logger __read_mostly = { |
0597f268 HW |
773 | .name = "nfnetlink_log", |
774 | .logfn = &nfulnl_log_packet, | |
775 | .me = THIS_MODULE, | |
776 | }; | |
777 | ||
fd8281ad PM |
778 | static const struct nla_policy nfula_cfg_policy[NFULA_CFG_MAX+1] = { |
779 | [NFULA_CFG_CMD] = { .len = sizeof(struct nfulnl_msg_config_cmd) }, | |
780 | [NFULA_CFG_MODE] = { .len = sizeof(struct nfulnl_msg_config_mode) }, | |
781 | [NFULA_CFG_TIMEOUT] = { .type = NLA_U32 }, | |
782 | [NFULA_CFG_QTHRESH] = { .type = NLA_U32 }, | |
783 | [NFULA_CFG_NLBUFSIZ] = { .type = NLA_U32 }, | |
784 | [NFULA_CFG_FLAGS] = { .type = NLA_U16 }, | |
0597f268 HW |
785 | }; |
786 | ||
787 | static int | |
788 | nfulnl_recv_config(struct sock *ctnl, struct sk_buff *skb, | |
39938324 PM |
789 | const struct nlmsghdr *nlh, |
790 | const struct nlattr * const nfula[]) | |
0597f268 | 791 | { |
d550d095 | 792 | struct nfgenmsg *nfmsg = nlmsg_data(nlh); |
0597f268 HW |
793 | u_int16_t group_num = ntohs(nfmsg->res_id); |
794 | struct nfulnl_instance *inst; | |
b7047a1c | 795 | struct nfulnl_msg_config_cmd *cmd = NULL; |
30e0c6a6 | 796 | struct net *net = sock_net(ctnl); |
9368a53c | 797 | struct nfnl_log_net *log = nfnl_log_pernet(net); |
0597f268 HW |
798 | int ret = 0; |
799 | ||
b7047a1c PM |
800 | if (nfula[NFULA_CFG_CMD]) { |
801 | u_int8_t pf = nfmsg->nfgen_family; | |
802 | cmd = nla_data(nfula[NFULA_CFG_CMD]); | |
803 | ||
804 | /* Commands without queue context */ | |
805 | switch (cmd->command) { | |
806 | case NFULNL_CFG_CMD_PF_BIND: | |
30e0c6a6 | 807 | return nf_log_bind_pf(net, pf, &nfulnl_logger); |
b7047a1c | 808 | case NFULNL_CFG_CMD_PF_UNBIND: |
30e0c6a6 | 809 | nf_log_unbind_pf(net, pf); |
b7047a1c PM |
810 | return 0; |
811 | } | |
812 | } | |
813 | ||
9368a53c | 814 | inst = instance_lookup_get(log, group_num); |
15e47304 | 815 | if (inst && inst->peer_portid != NETLINK_CB(skb).portid) { |
c0506365 PM |
816 | ret = -EPERM; |
817 | goto out_put; | |
818 | } | |
819 | ||
b7047a1c | 820 | if (cmd != NULL) { |
0597f268 HW |
821 | switch (cmd->command) { |
822 | case NFULNL_CFG_CMD_BIND: | |
823 | if (inst) { | |
824 | ret = -EBUSY; | |
825 | goto out_put; | |
826 | } | |
827 | ||
9368a53c | 828 | inst = instance_create(net, group_num, |
15e47304 | 829 | NETLINK_CB(skb).portid, |
e32123e5 | 830 | sk_user_ns(NETLINK_CB(skb).sk)); |
baab2ce7 PM |
831 | if (IS_ERR(inst)) { |
832 | ret = PTR_ERR(inst); | |
f414c16c | 833 | goto out; |
0597f268 HW |
834 | } |
835 | break; | |
836 | case NFULNL_CFG_CMD_UNBIND: | |
837 | if (!inst) { | |
838 | ret = -ENODEV; | |
f414c16c | 839 | goto out; |
0597f268 HW |
840 | } |
841 | ||
9368a53c | 842 | instance_destroy(log, inst); |
a49c6503 | 843 | goto out_put; |
0597f268 | 844 | default: |
cd21f0ac | 845 | ret = -ENOTSUPP; |
0597f268 HW |
846 | break; |
847 | } | |
0597f268 HW |
848 | } |
849 | ||
df6fb868 | 850 | if (nfula[NFULA_CFG_MODE]) { |
0597f268 | 851 | struct nfulnl_msg_config_mode *params; |
df6fb868 | 852 | params = nla_data(nfula[NFULA_CFG_MODE]); |
0597f268 | 853 | |
c0506365 PM |
854 | if (!inst) { |
855 | ret = -ENODEV; | |
856 | goto out; | |
857 | } | |
0597f268 | 858 | nfulnl_set_mode(inst, params->copy_mode, |
d1208b99 | 859 | ntohl(params->copy_range)); |
0597f268 HW |
860 | } |
861 | ||
df6fb868 | 862 | if (nfula[NFULA_CFG_TIMEOUT]) { |
0dfedd28 | 863 | __be32 timeout = nla_get_be32(nfula[NFULA_CFG_TIMEOUT]); |
0597f268 | 864 | |
c0506365 PM |
865 | if (!inst) { |
866 | ret = -ENODEV; | |
867 | goto out; | |
868 | } | |
0597f268 HW |
869 | nfulnl_set_timeout(inst, ntohl(timeout)); |
870 | } | |
871 | ||
df6fb868 | 872 | if (nfula[NFULA_CFG_NLBUFSIZ]) { |
0dfedd28 | 873 | __be32 nlbufsiz = nla_get_be32(nfula[NFULA_CFG_NLBUFSIZ]); |
0597f268 | 874 | |
c0506365 PM |
875 | if (!inst) { |
876 | ret = -ENODEV; | |
877 | goto out; | |
878 | } | |
0597f268 HW |
879 | nfulnl_set_nlbufsiz(inst, ntohl(nlbufsiz)); |
880 | } | |
881 | ||
df6fb868 | 882 | if (nfula[NFULA_CFG_QTHRESH]) { |
0dfedd28 | 883 | __be32 qthresh = nla_get_be32(nfula[NFULA_CFG_QTHRESH]); |
0597f268 | 884 | |
c0506365 PM |
885 | if (!inst) { |
886 | ret = -ENODEV; | |
887 | goto out; | |
888 | } | |
0597f268 HW |
889 | nfulnl_set_qthresh(inst, ntohl(qthresh)); |
890 | } | |
891 | ||
df6fb868 | 892 | if (nfula[NFULA_CFG_FLAGS]) { |
0dfedd28 | 893 | __be16 flags = nla_get_be16(nfula[NFULA_CFG_FLAGS]); |
c0506365 PM |
894 | |
895 | if (!inst) { | |
896 | ret = -ENODEV; | |
897 | goto out; | |
898 | } | |
ee433530 | 899 | nfulnl_set_flags(inst, ntohs(flags)); |
0af5f6c1 HW |
900 | } |
901 | ||
0597f268 HW |
902 | out_put: |
903 | instance_put(inst); | |
dd16704e | 904 | out: |
0597f268 HW |
905 | return ret; |
906 | } | |
907 | ||
7c8d4cb4 | 908 | static const struct nfnl_callback nfulnl_cb[NFULNL_MSG_MAX] = { |
0597f268 | 909 | [NFULNL_MSG_PACKET] = { .call = nfulnl_recv_unsupp, |
37d2e7a2 | 910 | .attr_count = NFULA_MAX, }, |
0597f268 | 911 | [NFULNL_MSG_CONFIG] = { .call = nfulnl_recv_config, |
fd8281ad PM |
912 | .attr_count = NFULA_CFG_MAX, |
913 | .policy = nfula_cfg_policy }, | |
0597f268 HW |
914 | }; |
915 | ||
7c8d4cb4 | 916 | static const struct nfnetlink_subsystem nfulnl_subsys = { |
0597f268 HW |
917 | .name = "log", |
918 | .subsys_id = NFNL_SUBSYS_ULOG, | |
919 | .cb_count = NFULNL_MSG_MAX, | |
0597f268 HW |
920 | .cb = nfulnl_cb, |
921 | }; | |
922 | ||
923 | #ifdef CONFIG_PROC_FS | |
924 | struct iter_state { | |
9368a53c | 925 | struct seq_net_private p; |
0597f268 HW |
926 | unsigned int bucket; |
927 | }; | |
928 | ||
9368a53c | 929 | static struct hlist_node *get_first(struct net *net, struct iter_state *st) |
0597f268 | 930 | { |
9368a53c | 931 | struct nfnl_log_net *log; |
0597f268 HW |
932 | if (!st) |
933 | return NULL; | |
934 | ||
9368a53c G |
935 | log = nfnl_log_pernet(net); |
936 | ||
0597f268 | 937 | for (st->bucket = 0; st->bucket < INSTANCE_BUCKETS; st->bucket++) { |
9368a53c G |
938 | struct hlist_head *head = &log->instance_table[st->bucket]; |
939 | ||
940 | if (!hlist_empty(head)) | |
941 | return rcu_dereference_bh(hlist_first_rcu(head)); | |
0597f268 HW |
942 | } |
943 | return NULL; | |
944 | } | |
945 | ||
9368a53c G |
946 | static struct hlist_node *get_next(struct net *net, struct iter_state *st, |
947 | struct hlist_node *h) | |
0597f268 | 948 | { |
0e60ebe0 | 949 | h = rcu_dereference_bh(hlist_next_rcu(h)); |
0597f268 | 950 | while (!h) { |
9368a53c G |
951 | struct nfnl_log_net *log; |
952 | struct hlist_head *head; | |
953 | ||
0597f268 HW |
954 | if (++st->bucket >= INSTANCE_BUCKETS) |
955 | return NULL; | |
956 | ||
9368a53c G |
957 | log = nfnl_log_pernet(net); |
958 | head = &log->instance_table[st->bucket]; | |
959 | h = rcu_dereference_bh(hlist_first_rcu(head)); | |
0597f268 HW |
960 | } |
961 | return h; | |
962 | } | |
963 | ||
9368a53c G |
964 | static struct hlist_node *get_idx(struct net *net, struct iter_state *st, |
965 | loff_t pos) | |
0597f268 HW |
966 | { |
967 | struct hlist_node *head; | |
9368a53c | 968 | head = get_first(net, st); |
0597f268 HW |
969 | |
970 | if (head) | |
9368a53c | 971 | while (pos && (head = get_next(net, st, head))) |
0597f268 HW |
972 | pos--; |
973 | return pos ? NULL : head; | |
974 | } | |
975 | ||
9368a53c | 976 | static void *seq_start(struct seq_file *s, loff_t *pos) |
bed1be20 | 977 | __acquires(rcu_bh) |
0597f268 | 978 | { |
bed1be20 | 979 | rcu_read_lock_bh(); |
9368a53c | 980 | return get_idx(seq_file_net(s), s->private, *pos); |
0597f268 HW |
981 | } |
982 | ||
983 | static void *seq_next(struct seq_file *s, void *v, loff_t *pos) | |
984 | { | |
985 | (*pos)++; | |
9368a53c | 986 | return get_next(seq_file_net(s), s->private, v); |
0597f268 HW |
987 | } |
988 | ||
989 | static void seq_stop(struct seq_file *s, void *v) | |
bed1be20 | 990 | __releases(rcu_bh) |
0597f268 | 991 | { |
bed1be20 | 992 | rcu_read_unlock_bh(); |
0597f268 HW |
993 | } |
994 | ||
995 | static int seq_show(struct seq_file *s, void *v) | |
996 | { | |
997 | const struct nfulnl_instance *inst = v; | |
998 | ||
601e68e1 | 999 | return seq_printf(s, "%5d %6d %5d %1d %5d %6d %2d\n", |
0597f268 | 1000 | inst->group_num, |
15e47304 | 1001 | inst->peer_portid, inst->qlen, |
0597f268 HW |
1002 | inst->copy_mode, inst->copy_range, |
1003 | inst->flushtimeout, atomic_read(&inst->use)); | |
1004 | } | |
1005 | ||
56b3d975 | 1006 | static const struct seq_operations nful_seq_ops = { |
0597f268 HW |
1007 | .start = seq_start, |
1008 | .next = seq_next, | |
1009 | .stop = seq_stop, | |
1010 | .show = seq_show, | |
1011 | }; | |
1012 | ||
1013 | static int nful_open(struct inode *inode, struct file *file) | |
1014 | { | |
9368a53c G |
1015 | return seq_open_net(inode, file, &nful_seq_ops, |
1016 | sizeof(struct iter_state)); | |
0597f268 HW |
1017 | } |
1018 | ||
da7071d7 | 1019 | static const struct file_operations nful_file_ops = { |
0597f268 HW |
1020 | .owner = THIS_MODULE, |
1021 | .open = nful_open, | |
1022 | .read = seq_read, | |
1023 | .llseek = seq_lseek, | |
9368a53c | 1024 | .release = seq_release_net, |
0597f268 HW |
1025 | }; |
1026 | ||
1027 | #endif /* PROC_FS */ | |
1028 | ||
9368a53c | 1029 | static int __net_init nfnl_log_net_init(struct net *net) |
0597f268 | 1030 | { |
9368a53c G |
1031 | unsigned int i; |
1032 | struct nfnl_log_net *log = nfnl_log_pernet(net); | |
601e68e1 | 1033 | |
0597f268 | 1034 | for (i = 0; i < INSTANCE_BUCKETS; i++) |
9368a53c G |
1035 | INIT_HLIST_HEAD(&log->instance_table[i]); |
1036 | spin_lock_init(&log->instances_lock); | |
1037 | ||
1038 | #ifdef CONFIG_PROC_FS | |
1039 | if (!proc_create("nfnetlink_log", 0440, | |
1040 | net->nf.proc_netfilter, &nful_file_ops)) | |
1041 | return -ENOMEM; | |
1042 | #endif | |
1043 | return 0; | |
1044 | } | |
1045 | ||
1046 | static void __net_exit nfnl_log_net_exit(struct net *net) | |
1047 | { | |
e778f56e | 1048 | #ifdef CONFIG_PROC_FS |
9368a53c | 1049 | remove_proc_entry("nfnetlink_log", net->nf.proc_netfilter); |
e778f56e | 1050 | #endif |
9368a53c G |
1051 | } |
1052 | ||
1053 | static struct pernet_operations nfnl_log_net_ops = { | |
1054 | .init = nfnl_log_net_init, | |
1055 | .exit = nfnl_log_net_exit, | |
1056 | .id = &nfnl_log_net_id, | |
1057 | .size = sizeof(struct nfnl_log_net), | |
1058 | }; | |
1059 | ||
1060 | static int __init nfnetlink_log_init(void) | |
1061 | { | |
1062 | int status = -ENOMEM; | |
601e68e1 | 1063 | |
0597f268 HW |
1064 | /* it's not really all that important to have a random value, so |
1065 | * we can do this from the init function, even if there hasn't | |
1066 | * been that much entropy yet */ | |
1067 | get_random_bytes(&hash_init, sizeof(hash_init)); | |
1068 | ||
1069 | netlink_register_notifier(&nfulnl_rtnl_notifier); | |
1070 | status = nfnetlink_subsys_register(&nfulnl_subsys); | |
1071 | if (status < 0) { | |
9368a53c | 1072 | pr_err("log: failed to create netlink socket\n"); |
0597f268 HW |
1073 | goto cleanup_netlink_notifier; |
1074 | } | |
1075 | ||
ca735b3a EL |
1076 | status = nf_log_register(NFPROTO_UNSPEC, &nfulnl_logger); |
1077 | if (status < 0) { | |
9368a53c | 1078 | pr_err("log: failed to register logger\n"); |
ca735b3a EL |
1079 | goto cleanup_subsys; |
1080 | } | |
1081 | ||
9368a53c G |
1082 | status = register_pernet_subsys(&nfnl_log_net_ops); |
1083 | if (status < 0) { | |
1084 | pr_err("log: failed to register pernet ops\n"); | |
ca735b3a | 1085 | goto cleanup_logger; |
6fc09f10 | 1086 | } |
0597f268 HW |
1087 | return status; |
1088 | ||
ca735b3a EL |
1089 | cleanup_logger: |
1090 | nf_log_unregister(&nfulnl_logger); | |
0597f268 | 1091 | cleanup_subsys: |
0597f268 HW |
1092 | nfnetlink_subsys_unregister(&nfulnl_subsys); |
1093 | cleanup_netlink_notifier: | |
1094 | netlink_unregister_notifier(&nfulnl_rtnl_notifier); | |
1095 | return status; | |
1096 | } | |
1097 | ||
65b4b4e8 | 1098 | static void __exit nfnetlink_log_fini(void) |
0597f268 | 1099 | { |
9368a53c | 1100 | unregister_pernet_subsys(&nfnl_log_net_ops); |
e92ad99c | 1101 | nf_log_unregister(&nfulnl_logger); |
32292a7f PM |
1102 | nfnetlink_subsys_unregister(&nfulnl_subsys); |
1103 | netlink_unregister_notifier(&nfulnl_rtnl_notifier); | |
0597f268 HW |
1104 | } |
1105 | ||
1106 | MODULE_DESCRIPTION("netfilter userspace logging"); | |
1107 | MODULE_AUTHOR("Harald Welte <laforge@netfilter.org>"); | |
1108 | MODULE_LICENSE("GPL"); | |
f682faef | 1109 | MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_ULOG); |
0597f268 | 1110 | |
65b4b4e8 AM |
1111 | module_init(nfnetlink_log_init); |
1112 | module_exit(nfnetlink_log_fini); |