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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> | |
5a0e3ad6 | 31 | #include <linux/slab.h> |
0597f268 | 32 | #include <net/sock.h> |
f01ffbd6 | 33 | #include <net/netfilter/nf_log.h> |
9368a53c | 34 | #include <net/netns/generic.h> |
d9e15007 | 35 | #include <net/netfilter/nfnetlink_log.h> |
0597f268 | 36 | |
60063497 | 37 | #include <linux/atomic.h> |
0597f268 | 38 | |
1109a90c | 39 | #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER) |
fbcd923c HW |
40 | #include "../bridge/br_private.h" |
41 | #endif | |
42 | ||
c2db2924 | 43 | #define NFULNL_NLBUFSIZ_DEFAULT NLMSG_GOODSIZE |
2c6764b7 | 44 | #define NFULNL_TIMEOUT_DEFAULT 100 /* every second */ |
0597f268 | 45 | #define NFULNL_QTHRESH_DEFAULT 100 /* 100 packets */ |
6b6ec99a | 46 | #define NFULNL_COPY_RANGE_MAX 0xFFFF /* max packet size is limited by 16-bit struct nfattr nfa_len field */ |
0597f268 HW |
47 | |
48 | #define PRINTR(x, args...) do { if (net_ratelimit()) \ | |
49 | printk(x, ## args); } while (0); | |
50 | ||
0597f268 HW |
51 | struct nfulnl_instance { |
52 | struct hlist_node hlist; /* global list of instances */ | |
53 | spinlock_t lock; | |
54 | atomic_t use; /* use count */ | |
55 | ||
56 | unsigned int qlen; /* number of nlmsgs in skb */ | |
57 | struct sk_buff *skb; /* pre-allocatd skb */ | |
0597f268 | 58 | struct timer_list timer; |
9368a53c | 59 | struct net *net; |
9eea9515 | 60 | struct user_namespace *peer_user_ns; /* User namespace of the peer process */ |
15e47304 | 61 | int peer_portid; /* PORTID of the peer process */ |
0597f268 HW |
62 | |
63 | /* configurable parameters */ | |
64 | unsigned int flushtimeout; /* timeout until queue flush */ | |
65 | unsigned int nlbufsiz; /* netlink buffer allocation size */ | |
66 | unsigned int qthreshold; /* threshold of the queue */ | |
67 | u_int32_t copy_range; | |
0af5f6c1 | 68 | u_int32_t seq; /* instance-local sequential counter */ |
0597f268 | 69 | u_int16_t group_num; /* number of this queue */ |
0af5f6c1 | 70 | u_int16_t flags; |
601e68e1 | 71 | u_int8_t copy_mode; |
bed1be20 | 72 | struct rcu_head rcu; |
0597f268 HW |
73 | }; |
74 | ||
0597f268 | 75 | #define INSTANCE_BUCKETS 16 |
0597f268 | 76 | |
9368a53c G |
77 | static int nfnl_log_net_id __read_mostly; |
78 | ||
79 | struct nfnl_log_net { | |
80 | spinlock_t instances_lock; | |
81 | struct hlist_head instance_table[INSTANCE_BUCKETS]; | |
82 | atomic_t global_seq; | |
83 | }; | |
84 | ||
85 | static struct nfnl_log_net *nfnl_log_pernet(struct net *net) | |
86 | { | |
87 | return net_generic(net, nfnl_log_net_id); | |
88 | } | |
89 | ||
0597f268 HW |
90 | static inline u_int8_t instance_hashfn(u_int16_t group_num) |
91 | { | |
92 | return ((group_num & 0xff) % INSTANCE_BUCKETS); | |
93 | } | |
94 | ||
95 | static struct nfulnl_instance * | |
9368a53c | 96 | __instance_lookup(struct nfnl_log_net *log, u_int16_t group_num) |
0597f268 HW |
97 | { |
98 | struct hlist_head *head; | |
0597f268 HW |
99 | struct nfulnl_instance *inst; |
100 | ||
9368a53c | 101 | head = &log->instance_table[instance_hashfn(group_num)]; |
b67bfe0d | 102 | hlist_for_each_entry_rcu(inst, head, hlist) { |
0597f268 HW |
103 | if (inst->group_num == group_num) |
104 | return inst; | |
105 | } | |
106 | return NULL; | |
107 | } | |
108 | ||
109 | static inline void | |
110 | instance_get(struct nfulnl_instance *inst) | |
111 | { | |
112 | atomic_inc(&inst->use); | |
113 | } | |
114 | ||
115 | static struct nfulnl_instance * | |
9368a53c | 116 | instance_lookup_get(struct nfnl_log_net *log, u_int16_t group_num) |
0597f268 HW |
117 | { |
118 | struct nfulnl_instance *inst; | |
119 | ||
bed1be20 | 120 | rcu_read_lock_bh(); |
9368a53c | 121 | inst = __instance_lookup(log, group_num); |
f5c5440d ED |
122 | if (inst && !atomic_inc_not_zero(&inst->use)) |
123 | inst = NULL; | |
bed1be20 | 124 | rcu_read_unlock_bh(); |
0597f268 HW |
125 | |
126 | return inst; | |
127 | } | |
128 | ||
bed1be20 ED |
129 | static void nfulnl_instance_free_rcu(struct rcu_head *head) |
130 | { | |
9368a53c G |
131 | struct nfulnl_instance *inst = |
132 | container_of(head, struct nfulnl_instance, rcu); | |
133 | ||
134 | put_net(inst->net); | |
135 | kfree(inst); | |
bed1be20 ED |
136 | module_put(THIS_MODULE); |
137 | } | |
138 | ||
0597f268 HW |
139 | static void |
140 | instance_put(struct nfulnl_instance *inst) | |
141 | { | |
bed1be20 ED |
142 | if (inst && atomic_dec_and_test(&inst->use)) |
143 | call_rcu_bh(&inst->rcu, nfulnl_instance_free_rcu); | |
0597f268 HW |
144 | } |
145 | ||
146 | static void nfulnl_timer(unsigned long data); | |
147 | ||
148 | static struct nfulnl_instance * | |
9368a53c G |
149 | instance_create(struct net *net, u_int16_t group_num, |
150 | int portid, struct user_namespace *user_ns) | |
0597f268 HW |
151 | { |
152 | struct nfulnl_instance *inst; | |
9368a53c | 153 | struct nfnl_log_net *log = nfnl_log_pernet(net); |
baab2ce7 | 154 | int err; |
0597f268 | 155 | |
9368a53c G |
156 | spin_lock_bh(&log->instances_lock); |
157 | if (__instance_lookup(log, group_num)) { | |
baab2ce7 | 158 | err = -EEXIST; |
0597f268 HW |
159 | goto out_unlock; |
160 | } | |
161 | ||
10dfdc69 | 162 | inst = kzalloc(sizeof(*inst), GFP_ATOMIC); |
baab2ce7 PM |
163 | if (!inst) { |
164 | err = -ENOMEM; | |
0597f268 | 165 | goto out_unlock; |
baab2ce7 | 166 | } |
0597f268 | 167 | |
aace57e0 MM |
168 | if (!try_module_get(THIS_MODULE)) { |
169 | kfree(inst); | |
baab2ce7 | 170 | err = -EAGAIN; |
aace57e0 MM |
171 | goto out_unlock; |
172 | } | |
173 | ||
0597f268 | 174 | INIT_HLIST_NODE(&inst->hlist); |
181a46a5 | 175 | spin_lock_init(&inst->lock); |
0597f268 HW |
176 | /* needs to be two, since we _put() after creation */ |
177 | atomic_set(&inst->use, 2); | |
178 | ||
e6f689db | 179 | setup_timer(&inst->timer, nfulnl_timer, (unsigned long)inst); |
0597f268 | 180 | |
9368a53c | 181 | inst->net = get_net(net); |
9eea9515 | 182 | inst->peer_user_ns = user_ns; |
15e47304 | 183 | inst->peer_portid = portid; |
0597f268 HW |
184 | inst->group_num = group_num; |
185 | ||
186 | inst->qthreshold = NFULNL_QTHRESH_DEFAULT; | |
187 | inst->flushtimeout = NFULNL_TIMEOUT_DEFAULT; | |
188 | inst->nlbufsiz = NFULNL_NLBUFSIZ_DEFAULT; | |
189 | inst->copy_mode = NFULNL_COPY_PACKET; | |
6b6ec99a | 190 | inst->copy_range = NFULNL_COPY_RANGE_MAX; |
0597f268 | 191 | |
f5c5440d | 192 | hlist_add_head_rcu(&inst->hlist, |
9368a53c G |
193 | &log->instance_table[instance_hashfn(group_num)]); |
194 | ||
0597f268 | 195 | |
9368a53c | 196 | spin_unlock_bh(&log->instances_lock); |
0597f268 HW |
197 | |
198 | return inst; | |
199 | ||
0597f268 | 200 | out_unlock: |
9368a53c | 201 | spin_unlock_bh(&log->instances_lock); |
baab2ce7 | 202 | return ERR_PTR(err); |
0597f268 HW |
203 | } |
204 | ||
e3567061 | 205 | static void __nfulnl_flush(struct nfulnl_instance *inst); |
0597f268 | 206 | |
f5c5440d | 207 | /* called with BH disabled */ |
0597f268 | 208 | static void |
9afdb00c | 209 | __instance_destroy(struct nfulnl_instance *inst) |
0597f268 HW |
210 | { |
211 | /* first pull it out of the global list */ | |
f5c5440d | 212 | hlist_del_rcu(&inst->hlist); |
0597f268 | 213 | |
0597f268 HW |
214 | /* then flush all pending packets from skb */ |
215 | ||
f5c5440d ED |
216 | spin_lock(&inst->lock); |
217 | ||
218 | /* lockless readers wont be able to use us */ | |
219 | inst->copy_mode = NFULNL_COPY_DISABLED; | |
220 | ||
e3567061 MM |
221 | if (inst->skb) |
222 | __nfulnl_flush(inst); | |
f5c5440d | 223 | spin_unlock(&inst->lock); |
0597f268 HW |
224 | |
225 | /* and finally put the refcount */ | |
226 | instance_put(inst); | |
0597f268 HW |
227 | } |
228 | ||
0597f268 | 229 | static inline void |
9368a53c G |
230 | instance_destroy(struct nfnl_log_net *log, |
231 | struct nfulnl_instance *inst) | |
0597f268 | 232 | { |
9368a53c | 233 | spin_lock_bh(&log->instances_lock); |
9afdb00c | 234 | __instance_destroy(inst); |
9368a53c | 235 | spin_unlock_bh(&log->instances_lock); |
0597f268 HW |
236 | } |
237 | ||
238 | static int | |
239 | nfulnl_set_mode(struct nfulnl_instance *inst, u_int8_t mode, | |
240 | unsigned int range) | |
241 | { | |
242 | int status = 0; | |
243 | ||
244 | spin_lock_bh(&inst->lock); | |
601e68e1 | 245 | |
0597f268 HW |
246 | switch (mode) { |
247 | case NFULNL_COPY_NONE: | |
248 | case NFULNL_COPY_META: | |
249 | inst->copy_mode = mode; | |
250 | inst->copy_range = 0; | |
251 | break; | |
601e68e1 | 252 | |
0597f268 HW |
253 | case NFULNL_COPY_PACKET: |
254 | inst->copy_mode = mode; | |
6b6ec99a MM |
255 | inst->copy_range = min_t(unsigned int, |
256 | range, NFULNL_COPY_RANGE_MAX); | |
0597f268 | 257 | break; |
601e68e1 | 258 | |
0597f268 HW |
259 | default: |
260 | status = -EINVAL; | |
261 | break; | |
262 | } | |
263 | ||
264 | spin_unlock_bh(&inst->lock); | |
265 | ||
266 | return status; | |
267 | } | |
268 | ||
269 | static int | |
270 | nfulnl_set_nlbufsiz(struct nfulnl_instance *inst, u_int32_t nlbufsiz) | |
271 | { | |
272 | int status; | |
273 | ||
274 | spin_lock_bh(&inst->lock); | |
275 | if (nlbufsiz < NFULNL_NLBUFSIZ_DEFAULT) | |
276 | status = -ERANGE; | |
277 | else if (nlbufsiz > 131072) | |
278 | status = -ERANGE; | |
279 | else { | |
280 | inst->nlbufsiz = nlbufsiz; | |
281 | status = 0; | |
282 | } | |
283 | spin_unlock_bh(&inst->lock); | |
284 | ||
285 | return status; | |
286 | } | |
287 | ||
288 | static int | |
289 | nfulnl_set_timeout(struct nfulnl_instance *inst, u_int32_t timeout) | |
290 | { | |
291 | spin_lock_bh(&inst->lock); | |
292 | inst->flushtimeout = timeout; | |
293 | spin_unlock_bh(&inst->lock); | |
294 | ||
295 | return 0; | |
296 | } | |
297 | ||
298 | static int | |
299 | nfulnl_set_qthresh(struct nfulnl_instance *inst, u_int32_t qthresh) | |
300 | { | |
301 | spin_lock_bh(&inst->lock); | |
302 | inst->qthreshold = qthresh; | |
303 | spin_unlock_bh(&inst->lock); | |
304 | ||
305 | return 0; | |
306 | } | |
307 | ||
0af5f6c1 HW |
308 | static int |
309 | nfulnl_set_flags(struct nfulnl_instance *inst, u_int16_t flags) | |
310 | { | |
311 | spin_lock_bh(&inst->lock); | |
ee433530 | 312 | inst->flags = flags; |
0af5f6c1 HW |
313 | spin_unlock_bh(&inst->lock); |
314 | ||
315 | return 0; | |
316 | } | |
317 | ||
c6a8f648 | 318 | static struct sk_buff * |
afff14f6 G |
319 | nfulnl_alloc_skb(struct net *net, u32 peer_portid, unsigned int inst_size, |
320 | unsigned int pkt_size) | |
0597f268 HW |
321 | { |
322 | struct sk_buff *skb; | |
ad2ad0f9 | 323 | unsigned int n; |
0597f268 | 324 | |
0597f268 HW |
325 | /* alloc skb which should be big enough for a whole multipart |
326 | * message. WARNING: has to be <= 128k due to slab restrictions */ | |
327 | ||
ad2ad0f9 | 328 | n = max(inst_size, pkt_size); |
afff14f6 | 329 | skb = nfnetlink_alloc_skb(net, n, peer_portid, GFP_ATOMIC); |
0597f268 | 330 | if (!skb) { |
ad2ad0f9 PM |
331 | if (n > pkt_size) { |
332 | /* try to allocate only as much as we need for current | |
333 | * packet */ | |
0597f268 | 334 | |
afff14f6 | 335 | skb = nfnetlink_alloc_skb(net, pkt_size, |
3ab1f683 | 336 | peer_portid, GFP_ATOMIC); |
ad2ad0f9 | 337 | } |
0597f268 HW |
338 | } |
339 | ||
340 | return skb; | |
341 | } | |
342 | ||
343 | static int | |
344 | __nfulnl_send(struct nfulnl_instance *inst) | |
345 | { | |
29c5d4af | 346 | int status = -1; |
0597f268 | 347 | |
d550d095 DM |
348 | if (inst->qlen > 1) { |
349 | struct nlmsghdr *nlh = nlmsg_put(inst->skb, 0, 0, | |
350 | NLMSG_DONE, | |
351 | sizeof(struct nfgenmsg), | |
352 | 0); | |
353 | if (!nlh) | |
354 | goto out; | |
355 | } | |
9368a53c | 356 | status = nfnetlink_unicast(inst->skb, inst->net, inst->peer_portid, |
cd8c20b6 | 357 | MSG_DONTWAIT); |
0597f268 HW |
358 | |
359 | inst->qlen = 0; | |
360 | inst->skb = NULL; | |
d550d095 | 361 | out: |
0597f268 HW |
362 | return status; |
363 | } | |
364 | ||
e3567061 MM |
365 | static void |
366 | __nfulnl_flush(struct nfulnl_instance *inst) | |
367 | { | |
368 | /* timer holds a reference */ | |
369 | if (del_timer(&inst->timer)) | |
370 | instance_put(inst); | |
371 | if (inst->skb) | |
372 | __nfulnl_send(inst); | |
373 | } | |
374 | ||
c6a8f648 MM |
375 | static void |
376 | nfulnl_timer(unsigned long data) | |
0597f268 | 377 | { |
601e68e1 | 378 | struct nfulnl_instance *inst = (struct nfulnl_instance *)data; |
0597f268 | 379 | |
0597f268 | 380 | spin_lock_bh(&inst->lock); |
370e6a87 MM |
381 | if (inst->skb) |
382 | __nfulnl_send(inst); | |
0597f268 | 383 | spin_unlock_bh(&inst->lock); |
05f7b7b3 | 384 | instance_put(inst); |
0597f268 HW |
385 | } |
386 | ||
0af5f6c1 HW |
387 | /* This is an inline function, we don't really care about a long |
388 | * list of arguments */ | |
601e68e1 | 389 | static inline int |
9368a53c G |
390 | __build_packet_message(struct nfnl_log_net *log, |
391 | struct nfulnl_instance *inst, | |
601e68e1 | 392 | const struct sk_buff *skb, |
0597f268 | 393 | unsigned int data_len, |
76108cea | 394 | u_int8_t pf, |
0597f268 HW |
395 | unsigned int hooknum, |
396 | const struct net_device *indev, | |
397 | const struct net_device *outdev, | |
d7a5c324 | 398 | const char *prefix, unsigned int plen) |
0597f268 | 399 | { |
0597f268 HW |
400 | struct nfulnl_msg_packet_hdr pmsg; |
401 | struct nlmsghdr *nlh; | |
402 | struct nfgenmsg *nfmsg; | |
27a884dc | 403 | sk_buff_data_t old_tail = inst->skb->tail; |
0626af31 | 404 | struct sock *sk; |
0c36b48b | 405 | const unsigned char *hwhdrp; |
0597f268 | 406 | |
d550d095 | 407 | nlh = nlmsg_put(inst->skb, 0, 0, |
0597f268 | 408 | NFNL_SUBSYS_ULOG << 8 | NFULNL_MSG_PACKET, |
d550d095 DM |
409 | sizeof(struct nfgenmsg), 0); |
410 | if (!nlh) | |
411 | return -1; | |
412 | nfmsg = nlmsg_data(nlh); | |
0597f268 HW |
413 | nfmsg->nfgen_family = pf; |
414 | nfmsg->version = NFNETLINK_V0; | |
415 | nfmsg->res_id = htons(inst->group_num); | |
416 | ||
e4d091d7 | 417 | memset(&pmsg, 0, sizeof(pmsg)); |
febf0a43 | 418 | pmsg.hw_protocol = skb->protocol; |
0597f268 HW |
419 | pmsg.hook = hooknum; |
420 | ||
1db20a52 DM |
421 | if (nla_put(inst->skb, NFULA_PACKET_HDR, sizeof(pmsg), &pmsg)) |
422 | goto nla_put_failure; | |
0597f268 | 423 | |
1db20a52 DM |
424 | if (prefix && |
425 | nla_put(inst->skb, NFULA_PREFIX, plen, prefix)) | |
426 | goto nla_put_failure; | |
0597f268 HW |
427 | |
428 | if (indev) { | |
1109a90c | 429 | #if !IS_ENABLED(CONFIG_BRIDGE_NETFILTER) |
1db20a52 DM |
430 | if (nla_put_be32(inst->skb, NFULA_IFINDEX_INDEV, |
431 | htonl(indev->ifindex))) | |
432 | goto nla_put_failure; | |
fbcd923c HW |
433 | #else |
434 | if (pf == PF_BRIDGE) { | |
435 | /* Case 1: outdev is physical input device, we need to | |
436 | * look for bridge group (when called from | |
437 | * netfilter_bridge) */ | |
1db20a52 DM |
438 | if (nla_put_be32(inst->skb, NFULA_IFINDEX_PHYSINDEV, |
439 | htonl(indev->ifindex)) || | |
fbcd923c | 440 | /* this is the bridge group "brX" */ |
f350a0a8 | 441 | /* rcu_read_lock()ed by nf_hook_slow or nf_log_packet */ |
1db20a52 DM |
442 | nla_put_be32(inst->skb, NFULA_IFINDEX_INDEV, |
443 | htonl(br_port_get_rcu(indev)->br->dev->ifindex))) | |
444 | goto nla_put_failure; | |
fbcd923c HW |
445 | } else { |
446 | /* Case 2: indev is bridge group, we need to look for | |
447 | * physical device (when called from ipv4) */ | |
1db20a52 DM |
448 | if (nla_put_be32(inst->skb, NFULA_IFINDEX_INDEV, |
449 | htonl(indev->ifindex))) | |
450 | goto nla_put_failure; | |
451 | if (skb->nf_bridge && skb->nf_bridge->physindev && | |
452 | nla_put_be32(inst->skb, NFULA_IFINDEX_PHYSINDEV, | |
453 | htonl(skb->nf_bridge->physindev->ifindex))) | |
454 | goto nla_put_failure; | |
fbcd923c HW |
455 | } |
456 | #endif | |
0597f268 HW |
457 | } |
458 | ||
459 | if (outdev) { | |
1109a90c | 460 | #if !IS_ENABLED(CONFIG_BRIDGE_NETFILTER) |
1db20a52 DM |
461 | if (nla_put_be32(inst->skb, NFULA_IFINDEX_OUTDEV, |
462 | htonl(outdev->ifindex))) | |
463 | goto nla_put_failure; | |
fbcd923c HW |
464 | #else |
465 | if (pf == PF_BRIDGE) { | |
466 | /* Case 1: outdev is physical output device, we need to | |
467 | * look for bridge group (when called from | |
468 | * netfilter_bridge) */ | |
1db20a52 DM |
469 | if (nla_put_be32(inst->skb, NFULA_IFINDEX_PHYSOUTDEV, |
470 | htonl(outdev->ifindex)) || | |
fbcd923c | 471 | /* this is the bridge group "brX" */ |
f350a0a8 | 472 | /* rcu_read_lock()ed by nf_hook_slow or nf_log_packet */ |
1db20a52 DM |
473 | nla_put_be32(inst->skb, NFULA_IFINDEX_OUTDEV, |
474 | htonl(br_port_get_rcu(outdev)->br->dev->ifindex))) | |
475 | goto nla_put_failure; | |
fbcd923c HW |
476 | } else { |
477 | /* Case 2: indev is a bridge group, we need to look | |
478 | * for physical device (when called from ipv4) */ | |
1db20a52 DM |
479 | if (nla_put_be32(inst->skb, NFULA_IFINDEX_OUTDEV, |
480 | htonl(outdev->ifindex))) | |
481 | goto nla_put_failure; | |
482 | if (skb->nf_bridge && skb->nf_bridge->physoutdev && | |
483 | nla_put_be32(inst->skb, NFULA_IFINDEX_PHYSOUTDEV, | |
484 | htonl(skb->nf_bridge->physoutdev->ifindex))) | |
485 | goto nla_put_failure; | |
fbcd923c HW |
486 | } |
487 | #endif | |
0597f268 HW |
488 | } |
489 | ||
1db20a52 DM |
490 | if (skb->mark && |
491 | nla_put_be32(inst->skb, NFULA_MARK, htonl(skb->mark))) | |
492 | goto nla_put_failure; | |
0597f268 | 493 | |
2c38de4c NC |
494 | if (indev && skb->dev && |
495 | skb->mac_header != skb->network_header) { | |
0597f268 | 496 | struct nfulnl_msg_packet_hw phw; |
e4d091d7 DC |
497 | int len; |
498 | ||
499 | memset(&phw, 0, sizeof(phw)); | |
500 | len = dev_parse_header(skb, phw.hw_addr); | |
b95cce35 SH |
501 | if (len > 0) { |
502 | phw.hw_addrlen = htons(len); | |
1db20a52 DM |
503 | if (nla_put(inst->skb, NFULA_HWADDR, sizeof(phw), &phw)) |
504 | goto nla_put_failure; | |
b95cce35 | 505 | } |
0597f268 HW |
506 | } |
507 | ||
72961ecf | 508 | if (indev && skb_mac_header_was_set(skb)) { |
2dba62c3 | 509 | if (nla_put_be16(inst->skb, NFULA_HWTYPE, htons(skb->dev->type)) || |
1db20a52 | 510 | nla_put_be16(inst->skb, NFULA_HWLEN, |
0c36b48b BH |
511 | htons(skb->dev->hard_header_len))) |
512 | goto nla_put_failure; | |
513 | ||
514 | hwhdrp = skb_mac_header(skb); | |
515 | ||
516 | if (skb->dev->type == ARPHRD_SIT) | |
517 | hwhdrp -= ETH_HLEN; | |
518 | ||
519 | if (hwhdrp >= skb->head && | |
520 | nla_put(inst->skb, NFULA_HWHEADER, | |
521 | skb->dev->hard_header_len, hwhdrp)) | |
1db20a52 | 522 | goto nla_put_failure; |
72961ecf EL |
523 | } |
524 | ||
b7aa0bf7 | 525 | if (skb->tstamp.tv64) { |
0597f268 | 526 | struct nfulnl_msg_packet_timestamp ts; |
b7aa0bf7 ED |
527 | struct timeval tv = ktime_to_timeval(skb->tstamp); |
528 | ts.sec = cpu_to_be64(tv.tv_sec); | |
529 | ts.usec = cpu_to_be64(tv.tv_usec); | |
0597f268 | 530 | |
1db20a52 DM |
531 | if (nla_put(inst->skb, NFULA_TIMESTAMP, sizeof(ts), &ts)) |
532 | goto nla_put_failure; | |
0597f268 HW |
533 | } |
534 | ||
535 | /* UID */ | |
0626af31 ED |
536 | sk = skb->sk; |
537 | if (sk && sk->sk_state != TCP_TIME_WAIT) { | |
538 | read_lock_bh(&sk->sk_callback_lock); | |
539 | if (sk->sk_socket && sk->sk_socket->file) { | |
540 | struct file *file = sk->sk_socket->file; | |
437589a7 LT |
541 | const struct cred *cred = file->f_cred; |
542 | struct user_namespace *user_ns = inst->peer_user_ns; | |
543 | __be32 uid = htonl(from_kuid_munged(user_ns, cred->fsuid)); | |
544 | __be32 gid = htonl(from_kgid_munged(user_ns, cred->fsgid)); | |
0626af31 | 545 | read_unlock_bh(&sk->sk_callback_lock); |
1db20a52 DM |
546 | if (nla_put_be32(inst->skb, NFULA_UID, uid) || |
547 | nla_put_be32(inst->skb, NFULA_GID, gid)) | |
548 | goto nla_put_failure; | |
0597f268 | 549 | } else |
0626af31 | 550 | read_unlock_bh(&sk->sk_callback_lock); |
0597f268 HW |
551 | } |
552 | ||
0af5f6c1 | 553 | /* local sequence number */ |
1db20a52 DM |
554 | if ((inst->flags & NFULNL_CFG_F_SEQ) && |
555 | nla_put_be32(inst->skb, NFULA_SEQ, htonl(inst->seq++))) | |
556 | goto nla_put_failure; | |
0dfedd28 | 557 | |
0af5f6c1 | 558 | /* global sequence number */ |
1db20a52 DM |
559 | if ((inst->flags & NFULNL_CFG_F_SEQ_GLOBAL) && |
560 | nla_put_be32(inst->skb, NFULA_SEQ_GLOBAL, | |
9368a53c | 561 | htonl(atomic_inc_return(&log->global_seq)))) |
1db20a52 | 562 | goto nla_put_failure; |
0af5f6c1 | 563 | |
0597f268 | 564 | if (data_len) { |
df6fb868 PM |
565 | struct nlattr *nla; |
566 | int size = nla_attr_size(data_len); | |
0597f268 | 567 | |
82251615 PNA |
568 | if (skb_tailroom(inst->skb) < nla_total_size(data_len)) |
569 | goto nla_put_failure; | |
0597f268 | 570 | |
df6fb868 PM |
571 | nla = (struct nlattr *)skb_put(inst->skb, nla_total_size(data_len)); |
572 | nla->nla_type = NFULA_PAYLOAD; | |
573 | nla->nla_len = size; | |
0597f268 | 574 | |
df6fb868 | 575 | if (skb_copy_bits(skb, 0, nla_data(nla), data_len)) |
0597f268 HW |
576 | BUG(); |
577 | } | |
601e68e1 | 578 | |
0597f268 HW |
579 | nlh->nlmsg_len = inst->skb->tail - old_tail; |
580 | return 0; | |
581 | ||
df6fb868 | 582 | nla_put_failure: |
0597f268 HW |
583 | PRINTR(KERN_ERR "nfnetlink_log: error creating log nlmsg\n"); |
584 | return -1; | |
585 | } | |
586 | ||
587 | #define RCV_SKB_FAIL(err) do { netlink_ack(skb, nlh, (err)); return; } while (0) | |
588 | ||
589 | static struct nf_loginfo default_loginfo = { | |
590 | .type = NF_LOG_TYPE_ULOG, | |
591 | .u = { | |
592 | .ulog = { | |
593 | .copy_len = 0xffff, | |
594 | .group = 0, | |
595 | .qthreshold = 1, | |
596 | }, | |
597 | }, | |
598 | }; | |
599 | ||
600 | /* log handler for internal netfilter logging api */ | |
5f7340ef | 601 | void |
8cdb46da HS |
602 | nfulnl_log_packet(struct net *net, |
603 | 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 | 616 | struct nfnl_log_net *log = nfnl_log_pernet(net); |
0597f268 | 617 | |
601e68e1 | 618 | if (li_user && li_user->type == NF_LOG_TYPE_ULOG) |
0597f268 HW |
619 | li = li_user; |
620 | else | |
621 | li = &default_loginfo; | |
622 | ||
9368a53c | 623 | inst = instance_lookup_get(log, li->u.ulog.group); |
0597f268 | 624 | if (!inst) |
0597f268 | 625 | return; |
0597f268 | 626 | |
d7a5c324 PM |
627 | plen = 0; |
628 | if (prefix) | |
881dbfe8 | 629 | plen = strlen(prefix) + 1; |
d7a5c324 | 630 | |
0597f268 HW |
631 | /* FIXME: do we want to make the size calculation conditional based on |
632 | * what is actually present? way more branches and checks, but more | |
633 | * memory efficient... */ | |
573ce260 | 634 | size = nlmsg_total_size(sizeof(struct nfgenmsg)) |
df6fb868 PM |
635 | + nla_total_size(sizeof(struct nfulnl_msg_packet_hdr)) |
636 | + nla_total_size(sizeof(u_int32_t)) /* ifindex */ | |
637 | + nla_total_size(sizeof(u_int32_t)) /* ifindex */ | |
1109a90c | 638 | #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER) |
df6fb868 PM |
639 | + nla_total_size(sizeof(u_int32_t)) /* ifindex */ |
640 | + nla_total_size(sizeof(u_int32_t)) /* ifindex */ | |
fbcd923c | 641 | #endif |
df6fb868 PM |
642 | + nla_total_size(sizeof(u_int32_t)) /* mark */ |
643 | + nla_total_size(sizeof(u_int32_t)) /* uid */ | |
76aa1ce1 | 644 | + nla_total_size(sizeof(u_int32_t)) /* gid */ |
df6fb868 PM |
645 | + nla_total_size(plen) /* prefix */ |
646 | + nla_total_size(sizeof(struct nfulnl_msg_packet_hw)) | |
647 | + nla_total_size(sizeof(struct nfulnl_msg_packet_timestamp)); | |
0597f268 | 648 | |
eeff9bee PNA |
649 | if (in && skb_mac_header_was_set(skb)) { |
650 | size += nla_total_size(skb->dev->hard_header_len) | |
651 | + nla_total_size(sizeof(u_int16_t)) /* hwtype */ | |
652 | + nla_total_size(sizeof(u_int16_t)); /* hwlen */ | |
653 | } | |
654 | ||
0597f268 HW |
655 | spin_lock_bh(&inst->lock); |
656 | ||
0af5f6c1 | 657 | if (inst->flags & NFULNL_CFG_F_SEQ) |
df6fb868 | 658 | size += nla_total_size(sizeof(u_int32_t)); |
0af5f6c1 | 659 | if (inst->flags & NFULNL_CFG_F_SEQ_GLOBAL) |
df6fb868 | 660 | size += nla_total_size(sizeof(u_int32_t)); |
0af5f6c1 | 661 | |
0597f268 HW |
662 | qthreshold = inst->qthreshold; |
663 | /* per-rule qthreshold overrides per-instance */ | |
5ca431f9 EL |
664 | if (li->u.ulog.qthreshold) |
665 | if (qthreshold > li->u.ulog.qthreshold) | |
666 | qthreshold = li->u.ulog.qthreshold; | |
667 | ||
601e68e1 | 668 | |
0597f268 HW |
669 | switch (inst->copy_mode) { |
670 | case NFULNL_COPY_META: | |
671 | case NFULNL_COPY_NONE: | |
672 | data_len = 0; | |
673 | break; | |
601e68e1 | 674 | |
0597f268 | 675 | case NFULNL_COPY_PACKET: |
601e68e1 | 676 | if (inst->copy_range == 0 |
0597f268 HW |
677 | || inst->copy_range > skb->len) |
678 | data_len = skb->len; | |
679 | else | |
680 | data_len = inst->copy_range; | |
601e68e1 | 681 | |
df6fb868 | 682 | size += nla_total_size(data_len); |
0597f268 | 683 | break; |
601e68e1 | 684 | |
f5c5440d | 685 | case NFULNL_COPY_DISABLED: |
0597f268 | 686 | default: |
55b5a91e | 687 | goto unlock_and_release; |
0597f268 HW |
688 | } |
689 | ||
d63b043d MM |
690 | if (inst->skb && |
691 | size > skb_tailroom(inst->skb) - sizeof(struct nfgenmsg)) { | |
0597f268 HW |
692 | /* either the queue len is too high or we don't have |
693 | * enough room in the skb left. flush to userspace. */ | |
e3567061 | 694 | __nfulnl_flush(inst); |
55b5a91e | 695 | } |
0597f268 | 696 | |
55b5a91e | 697 | if (!inst->skb) { |
afff14f6 G |
698 | inst->skb = nfulnl_alloc_skb(net, inst->peer_portid, |
699 | inst->nlbufsiz, size); | |
55b5a91e | 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 | 770 | .name = "nfnetlink_log", |
5962815a | 771 | .type = NF_LOG_TYPE_ULOG, |
0597f268 HW |
772 | .logfn = &nfulnl_log_packet, |
773 | .me = THIS_MODULE, | |
774 | }; | |
775 | ||
fd8281ad PM |
776 | static const struct nla_policy nfula_cfg_policy[NFULA_CFG_MAX+1] = { |
777 | [NFULA_CFG_CMD] = { .len = sizeof(struct nfulnl_msg_config_cmd) }, | |
778 | [NFULA_CFG_MODE] = { .len = sizeof(struct nfulnl_msg_config_mode) }, | |
779 | [NFULA_CFG_TIMEOUT] = { .type = NLA_U32 }, | |
780 | [NFULA_CFG_QTHRESH] = { .type = NLA_U32 }, | |
781 | [NFULA_CFG_NLBUFSIZ] = { .type = NLA_U32 }, | |
782 | [NFULA_CFG_FLAGS] = { .type = NLA_U16 }, | |
0597f268 HW |
783 | }; |
784 | ||
785 | static int | |
786 | nfulnl_recv_config(struct sock *ctnl, struct sk_buff *skb, | |
39938324 PM |
787 | const struct nlmsghdr *nlh, |
788 | const struct nlattr * const nfula[]) | |
0597f268 | 789 | { |
d550d095 | 790 | struct nfgenmsg *nfmsg = nlmsg_data(nlh); |
0597f268 HW |
791 | u_int16_t group_num = ntohs(nfmsg->res_id); |
792 | struct nfulnl_instance *inst; | |
b7047a1c | 793 | struct nfulnl_msg_config_cmd *cmd = NULL; |
30e0c6a6 | 794 | struct net *net = sock_net(ctnl); |
9368a53c | 795 | struct nfnl_log_net *log = nfnl_log_pernet(net); |
0597f268 HW |
796 | int ret = 0; |
797 | ||
b7047a1c PM |
798 | if (nfula[NFULA_CFG_CMD]) { |
799 | u_int8_t pf = nfmsg->nfgen_family; | |
800 | cmd = nla_data(nfula[NFULA_CFG_CMD]); | |
801 | ||
802 | /* Commands without queue context */ | |
803 | switch (cmd->command) { | |
804 | case NFULNL_CFG_CMD_PF_BIND: | |
30e0c6a6 | 805 | return nf_log_bind_pf(net, pf, &nfulnl_logger); |
b7047a1c | 806 | case NFULNL_CFG_CMD_PF_UNBIND: |
30e0c6a6 | 807 | nf_log_unbind_pf(net, pf); |
b7047a1c PM |
808 | return 0; |
809 | } | |
810 | } | |
811 | ||
9368a53c | 812 | inst = instance_lookup_get(log, group_num); |
15e47304 | 813 | if (inst && inst->peer_portid != NETLINK_CB(skb).portid) { |
c0506365 PM |
814 | ret = -EPERM; |
815 | goto out_put; | |
816 | } | |
817 | ||
b7047a1c | 818 | if (cmd != NULL) { |
0597f268 HW |
819 | switch (cmd->command) { |
820 | case NFULNL_CFG_CMD_BIND: | |
821 | if (inst) { | |
822 | ret = -EBUSY; | |
823 | goto out_put; | |
824 | } | |
825 | ||
9368a53c | 826 | inst = instance_create(net, group_num, |
15e47304 | 827 | NETLINK_CB(skb).portid, |
e32123e5 | 828 | sk_user_ns(NETLINK_CB(skb).sk)); |
baab2ce7 PM |
829 | if (IS_ERR(inst)) { |
830 | ret = PTR_ERR(inst); | |
f414c16c | 831 | goto out; |
0597f268 HW |
832 | } |
833 | break; | |
834 | case NFULNL_CFG_CMD_UNBIND: | |
835 | if (!inst) { | |
836 | ret = -ENODEV; | |
f414c16c | 837 | goto out; |
0597f268 HW |
838 | } |
839 | ||
9368a53c | 840 | instance_destroy(log, inst); |
a49c6503 | 841 | goto out_put; |
0597f268 | 842 | default: |
cd21f0ac | 843 | ret = -ENOTSUPP; |
0597f268 HW |
844 | break; |
845 | } | |
0597f268 HW |
846 | } |
847 | ||
df6fb868 | 848 | if (nfula[NFULA_CFG_MODE]) { |
0597f268 | 849 | struct nfulnl_msg_config_mode *params; |
df6fb868 | 850 | params = nla_data(nfula[NFULA_CFG_MODE]); |
0597f268 | 851 | |
c0506365 PM |
852 | if (!inst) { |
853 | ret = -ENODEV; | |
854 | goto out; | |
855 | } | |
0597f268 | 856 | nfulnl_set_mode(inst, params->copy_mode, |
d1208b99 | 857 | ntohl(params->copy_range)); |
0597f268 HW |
858 | } |
859 | ||
df6fb868 | 860 | if (nfula[NFULA_CFG_TIMEOUT]) { |
0dfedd28 | 861 | __be32 timeout = nla_get_be32(nfula[NFULA_CFG_TIMEOUT]); |
0597f268 | 862 | |
c0506365 PM |
863 | if (!inst) { |
864 | ret = -ENODEV; | |
865 | goto out; | |
866 | } | |
0597f268 HW |
867 | nfulnl_set_timeout(inst, ntohl(timeout)); |
868 | } | |
869 | ||
df6fb868 | 870 | if (nfula[NFULA_CFG_NLBUFSIZ]) { |
0dfedd28 | 871 | __be32 nlbufsiz = nla_get_be32(nfula[NFULA_CFG_NLBUFSIZ]); |
0597f268 | 872 | |
c0506365 PM |
873 | if (!inst) { |
874 | ret = -ENODEV; | |
875 | goto out; | |
876 | } | |
0597f268 HW |
877 | nfulnl_set_nlbufsiz(inst, ntohl(nlbufsiz)); |
878 | } | |
879 | ||
df6fb868 | 880 | if (nfula[NFULA_CFG_QTHRESH]) { |
0dfedd28 | 881 | __be32 qthresh = nla_get_be32(nfula[NFULA_CFG_QTHRESH]); |
0597f268 | 882 | |
c0506365 PM |
883 | if (!inst) { |
884 | ret = -ENODEV; | |
885 | goto out; | |
886 | } | |
0597f268 HW |
887 | nfulnl_set_qthresh(inst, ntohl(qthresh)); |
888 | } | |
889 | ||
df6fb868 | 890 | if (nfula[NFULA_CFG_FLAGS]) { |
0dfedd28 | 891 | __be16 flags = nla_get_be16(nfula[NFULA_CFG_FLAGS]); |
c0506365 PM |
892 | |
893 | if (!inst) { | |
894 | ret = -ENODEV; | |
895 | goto out; | |
896 | } | |
ee433530 | 897 | nfulnl_set_flags(inst, ntohs(flags)); |
0af5f6c1 HW |
898 | } |
899 | ||
0597f268 HW |
900 | out_put: |
901 | instance_put(inst); | |
dd16704e | 902 | out: |
0597f268 HW |
903 | return ret; |
904 | } | |
905 | ||
7c8d4cb4 | 906 | static const struct nfnl_callback nfulnl_cb[NFULNL_MSG_MAX] = { |
0597f268 | 907 | [NFULNL_MSG_PACKET] = { .call = nfulnl_recv_unsupp, |
37d2e7a2 | 908 | .attr_count = NFULA_MAX, }, |
0597f268 | 909 | [NFULNL_MSG_CONFIG] = { .call = nfulnl_recv_config, |
fd8281ad PM |
910 | .attr_count = NFULA_CFG_MAX, |
911 | .policy = nfula_cfg_policy }, | |
0597f268 HW |
912 | }; |
913 | ||
7c8d4cb4 | 914 | static const struct nfnetlink_subsystem nfulnl_subsys = { |
0597f268 HW |
915 | .name = "log", |
916 | .subsys_id = NFNL_SUBSYS_ULOG, | |
917 | .cb_count = NFULNL_MSG_MAX, | |
0597f268 HW |
918 | .cb = nfulnl_cb, |
919 | }; | |
920 | ||
921 | #ifdef CONFIG_PROC_FS | |
922 | struct iter_state { | |
9368a53c | 923 | struct seq_net_private p; |
0597f268 HW |
924 | unsigned int bucket; |
925 | }; | |
926 | ||
9368a53c | 927 | static struct hlist_node *get_first(struct net *net, struct iter_state *st) |
0597f268 | 928 | { |
9368a53c | 929 | struct nfnl_log_net *log; |
0597f268 HW |
930 | if (!st) |
931 | return NULL; | |
932 | ||
9368a53c G |
933 | log = nfnl_log_pernet(net); |
934 | ||
0597f268 | 935 | for (st->bucket = 0; st->bucket < INSTANCE_BUCKETS; st->bucket++) { |
9368a53c G |
936 | struct hlist_head *head = &log->instance_table[st->bucket]; |
937 | ||
938 | if (!hlist_empty(head)) | |
939 | return rcu_dereference_bh(hlist_first_rcu(head)); | |
0597f268 HW |
940 | } |
941 | return NULL; | |
942 | } | |
943 | ||
9368a53c G |
944 | static struct hlist_node *get_next(struct net *net, struct iter_state *st, |
945 | struct hlist_node *h) | |
0597f268 | 946 | { |
0e60ebe0 | 947 | h = rcu_dereference_bh(hlist_next_rcu(h)); |
0597f268 | 948 | while (!h) { |
9368a53c G |
949 | struct nfnl_log_net *log; |
950 | struct hlist_head *head; | |
951 | ||
0597f268 HW |
952 | if (++st->bucket >= INSTANCE_BUCKETS) |
953 | return NULL; | |
954 | ||
9368a53c G |
955 | log = nfnl_log_pernet(net); |
956 | head = &log->instance_table[st->bucket]; | |
957 | h = rcu_dereference_bh(hlist_first_rcu(head)); | |
0597f268 HW |
958 | } |
959 | return h; | |
960 | } | |
961 | ||
9368a53c G |
962 | static struct hlist_node *get_idx(struct net *net, struct iter_state *st, |
963 | loff_t pos) | |
0597f268 HW |
964 | { |
965 | struct hlist_node *head; | |
9368a53c | 966 | head = get_first(net, st); |
0597f268 HW |
967 | |
968 | if (head) | |
9368a53c | 969 | while (pos && (head = get_next(net, st, head))) |
0597f268 HW |
970 | pos--; |
971 | return pos ? NULL : head; | |
972 | } | |
973 | ||
9368a53c | 974 | static void *seq_start(struct seq_file *s, loff_t *pos) |
bed1be20 | 975 | __acquires(rcu_bh) |
0597f268 | 976 | { |
bed1be20 | 977 | rcu_read_lock_bh(); |
9368a53c | 978 | return get_idx(seq_file_net(s), s->private, *pos); |
0597f268 HW |
979 | } |
980 | ||
981 | static void *seq_next(struct seq_file *s, void *v, loff_t *pos) | |
982 | { | |
983 | (*pos)++; | |
9368a53c | 984 | return get_next(seq_file_net(s), s->private, v); |
0597f268 HW |
985 | } |
986 | ||
987 | static void seq_stop(struct seq_file *s, void *v) | |
bed1be20 | 988 | __releases(rcu_bh) |
0597f268 | 989 | { |
bed1be20 | 990 | rcu_read_unlock_bh(); |
0597f268 HW |
991 | } |
992 | ||
993 | static int seq_show(struct seq_file *s, void *v) | |
994 | { | |
995 | const struct nfulnl_instance *inst = v; | |
996 | ||
601e68e1 | 997 | return seq_printf(s, "%5d %6d %5d %1d %5d %6d %2d\n", |
0597f268 | 998 | inst->group_num, |
15e47304 | 999 | inst->peer_portid, inst->qlen, |
0597f268 HW |
1000 | inst->copy_mode, inst->copy_range, |
1001 | inst->flushtimeout, atomic_read(&inst->use)); | |
1002 | } | |
1003 | ||
56b3d975 | 1004 | static const struct seq_operations nful_seq_ops = { |
0597f268 HW |
1005 | .start = seq_start, |
1006 | .next = seq_next, | |
1007 | .stop = seq_stop, | |
1008 | .show = seq_show, | |
1009 | }; | |
1010 | ||
1011 | static int nful_open(struct inode *inode, struct file *file) | |
1012 | { | |
9368a53c G |
1013 | return seq_open_net(inode, file, &nful_seq_ops, |
1014 | sizeof(struct iter_state)); | |
0597f268 HW |
1015 | } |
1016 | ||
da7071d7 | 1017 | static const struct file_operations nful_file_ops = { |
0597f268 HW |
1018 | .owner = THIS_MODULE, |
1019 | .open = nful_open, | |
1020 | .read = seq_read, | |
1021 | .llseek = seq_lseek, | |
9368a53c | 1022 | .release = seq_release_net, |
0597f268 HW |
1023 | }; |
1024 | ||
1025 | #endif /* PROC_FS */ | |
1026 | ||
9368a53c | 1027 | static int __net_init nfnl_log_net_init(struct net *net) |
0597f268 | 1028 | { |
9368a53c G |
1029 | unsigned int i; |
1030 | struct nfnl_log_net *log = nfnl_log_pernet(net); | |
601e68e1 | 1031 | |
0597f268 | 1032 | for (i = 0; i < INSTANCE_BUCKETS; i++) |
9368a53c G |
1033 | INIT_HLIST_HEAD(&log->instance_table[i]); |
1034 | spin_lock_init(&log->instances_lock); | |
1035 | ||
1036 | #ifdef CONFIG_PROC_FS | |
1037 | if (!proc_create("nfnetlink_log", 0440, | |
1038 | net->nf.proc_netfilter, &nful_file_ops)) | |
1039 | return -ENOMEM; | |
1040 | #endif | |
1041 | return 0; | |
1042 | } | |
1043 | ||
1044 | static void __net_exit nfnl_log_net_exit(struct net *net) | |
1045 | { | |
e778f56e | 1046 | #ifdef CONFIG_PROC_FS |
9368a53c | 1047 | remove_proc_entry("nfnetlink_log", net->nf.proc_netfilter); |
e778f56e | 1048 | #endif |
45c2aff6 | 1049 | nf_log_unset(net, &nfulnl_logger); |
9368a53c G |
1050 | } |
1051 | ||
1052 | static struct pernet_operations nfnl_log_net_ops = { | |
1053 | .init = nfnl_log_net_init, | |
1054 | .exit = nfnl_log_net_exit, | |
1055 | .id = &nfnl_log_net_id, | |
1056 | .size = sizeof(struct nfnl_log_net), | |
1057 | }; | |
1058 | ||
1059 | static int __init nfnetlink_log_init(void) | |
1060 | { | |
1061 | int status = -ENOMEM; | |
601e68e1 | 1062 | |
0597f268 HW |
1063 | netlink_register_notifier(&nfulnl_rtnl_notifier); |
1064 | status = nfnetlink_subsys_register(&nfulnl_subsys); | |
1065 | if (status < 0) { | |
9368a53c | 1066 | pr_err("log: failed to create netlink socket\n"); |
0597f268 HW |
1067 | goto cleanup_netlink_notifier; |
1068 | } | |
1069 | ||
ca735b3a EL |
1070 | status = nf_log_register(NFPROTO_UNSPEC, &nfulnl_logger); |
1071 | if (status < 0) { | |
9368a53c | 1072 | pr_err("log: failed to register logger\n"); |
ca735b3a EL |
1073 | goto cleanup_subsys; |
1074 | } | |
1075 | ||
9368a53c G |
1076 | status = register_pernet_subsys(&nfnl_log_net_ops); |
1077 | if (status < 0) { | |
1078 | pr_err("log: failed to register pernet ops\n"); | |
ca735b3a | 1079 | goto cleanup_logger; |
6fc09f10 | 1080 | } |
0597f268 HW |
1081 | return status; |
1082 | ||
ca735b3a EL |
1083 | cleanup_logger: |
1084 | nf_log_unregister(&nfulnl_logger); | |
0597f268 | 1085 | cleanup_subsys: |
0597f268 HW |
1086 | nfnetlink_subsys_unregister(&nfulnl_subsys); |
1087 | cleanup_netlink_notifier: | |
1088 | netlink_unregister_notifier(&nfulnl_rtnl_notifier); | |
1089 | return status; | |
1090 | } | |
1091 | ||
65b4b4e8 | 1092 | static void __exit nfnetlink_log_fini(void) |
0597f268 | 1093 | { |
9368a53c | 1094 | unregister_pernet_subsys(&nfnl_log_net_ops); |
e92ad99c | 1095 | nf_log_unregister(&nfulnl_logger); |
32292a7f PM |
1096 | nfnetlink_subsys_unregister(&nfulnl_subsys); |
1097 | netlink_unregister_notifier(&nfulnl_rtnl_notifier); | |
0597f268 HW |
1098 | } |
1099 | ||
1100 | MODULE_DESCRIPTION("netfilter userspace logging"); | |
1101 | MODULE_AUTHOR("Harald Welte <laforge@netfilter.org>"); | |
1102 | MODULE_LICENSE("GPL"); | |
f682faef | 1103 | MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_ULOG); |
fab4085f PNA |
1104 | MODULE_ALIAS_NF_LOGGER(AF_INET, 1); |
1105 | MODULE_ALIAS_NF_LOGGER(AF_INET6, 1); | |
1106 | MODULE_ALIAS_NF_LOGGER(AF_BRIDGE, 1); | |
0597f268 | 1107 | |
65b4b4e8 AM |
1108 | module_init(nfnetlink_log_init); |
1109 | module_exit(nfnetlink_log_fini); |