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 */ |
c1e7dc91 FW |
46 | /* max packet size is limited by 16-bit struct nfattr nfa_len field */ |
47 | #define NFULNL_COPY_RANGE_MAX (0xFFFF - NLA_HDRLEN) | |
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 | 77 | |
9368a53c G |
78 | static int nfnl_log_net_id __read_mostly; |
79 | ||
80 | struct nfnl_log_net { | |
81 | spinlock_t instances_lock; | |
82 | struct hlist_head instance_table[INSTANCE_BUCKETS]; | |
83 | atomic_t global_seq; | |
84 | }; | |
85 | ||
86 | static struct nfnl_log_net *nfnl_log_pernet(struct net *net) | |
87 | { | |
88 | return net_generic(net, nfnl_log_net_id); | |
89 | } | |
90 | ||
0597f268 HW |
91 | static inline u_int8_t instance_hashfn(u_int16_t group_num) |
92 | { | |
93 | return ((group_num & 0xff) % INSTANCE_BUCKETS); | |
94 | } | |
95 | ||
96 | static struct nfulnl_instance * | |
9368a53c | 97 | __instance_lookup(struct nfnl_log_net *log, u_int16_t group_num) |
0597f268 HW |
98 | { |
99 | struct hlist_head *head; | |
0597f268 HW |
100 | struct nfulnl_instance *inst; |
101 | ||
9368a53c | 102 | head = &log->instance_table[instance_hashfn(group_num)]; |
b67bfe0d | 103 | hlist_for_each_entry_rcu(inst, head, hlist) { |
0597f268 HW |
104 | if (inst->group_num == group_num) |
105 | return inst; | |
106 | } | |
107 | return NULL; | |
108 | } | |
109 | ||
110 | static inline void | |
111 | instance_get(struct nfulnl_instance *inst) | |
112 | { | |
113 | atomic_inc(&inst->use); | |
114 | } | |
115 | ||
116 | static struct nfulnl_instance * | |
9368a53c | 117 | instance_lookup_get(struct nfnl_log_net *log, u_int16_t group_num) |
0597f268 HW |
118 | { |
119 | struct nfulnl_instance *inst; | |
120 | ||
bed1be20 | 121 | rcu_read_lock_bh(); |
9368a53c | 122 | inst = __instance_lookup(log, group_num); |
f5c5440d ED |
123 | if (inst && !atomic_inc_not_zero(&inst->use)) |
124 | inst = NULL; | |
bed1be20 | 125 | rcu_read_unlock_bh(); |
0597f268 HW |
126 | |
127 | return inst; | |
128 | } | |
129 | ||
bed1be20 ED |
130 | static void nfulnl_instance_free_rcu(struct rcu_head *head) |
131 | { | |
9368a53c G |
132 | struct nfulnl_instance *inst = |
133 | container_of(head, struct nfulnl_instance, rcu); | |
134 | ||
135 | put_net(inst->net); | |
136 | kfree(inst); | |
bed1be20 ED |
137 | module_put(THIS_MODULE); |
138 | } | |
139 | ||
0597f268 HW |
140 | static void |
141 | instance_put(struct nfulnl_instance *inst) | |
142 | { | |
bed1be20 ED |
143 | if (inst && atomic_dec_and_test(&inst->use)) |
144 | call_rcu_bh(&inst->rcu, nfulnl_instance_free_rcu); | |
0597f268 HW |
145 | } |
146 | ||
147 | static void nfulnl_timer(unsigned long data); | |
148 | ||
149 | static struct nfulnl_instance * | |
9368a53c G |
150 | instance_create(struct net *net, u_int16_t group_num, |
151 | int portid, struct user_namespace *user_ns) | |
0597f268 HW |
152 | { |
153 | struct nfulnl_instance *inst; | |
9368a53c | 154 | struct nfnl_log_net *log = nfnl_log_pernet(net); |
baab2ce7 | 155 | int err; |
0597f268 | 156 | |
9368a53c G |
157 | spin_lock_bh(&log->instances_lock); |
158 | if (__instance_lookup(log, group_num)) { | |
baab2ce7 | 159 | err = -EEXIST; |
0597f268 HW |
160 | goto out_unlock; |
161 | } | |
162 | ||
10dfdc69 | 163 | inst = kzalloc(sizeof(*inst), GFP_ATOMIC); |
baab2ce7 PM |
164 | if (!inst) { |
165 | err = -ENOMEM; | |
0597f268 | 166 | goto out_unlock; |
baab2ce7 | 167 | } |
0597f268 | 168 | |
aace57e0 MM |
169 | if (!try_module_get(THIS_MODULE)) { |
170 | kfree(inst); | |
baab2ce7 | 171 | err = -EAGAIN; |
aace57e0 MM |
172 | goto out_unlock; |
173 | } | |
174 | ||
0597f268 | 175 | INIT_HLIST_NODE(&inst->hlist); |
181a46a5 | 176 | spin_lock_init(&inst->lock); |
0597f268 HW |
177 | /* needs to be two, since we _put() after creation */ |
178 | atomic_set(&inst->use, 2); | |
179 | ||
e6f689db | 180 | setup_timer(&inst->timer, nfulnl_timer, (unsigned long)inst); |
0597f268 | 181 | |
9368a53c | 182 | inst->net = get_net(net); |
9eea9515 | 183 | inst->peer_user_ns = user_ns; |
15e47304 | 184 | inst->peer_portid = portid; |
0597f268 HW |
185 | inst->group_num = group_num; |
186 | ||
187 | inst->qthreshold = NFULNL_QTHRESH_DEFAULT; | |
188 | inst->flushtimeout = NFULNL_TIMEOUT_DEFAULT; | |
189 | inst->nlbufsiz = NFULNL_NLBUFSIZ_DEFAULT; | |
190 | inst->copy_mode = NFULNL_COPY_PACKET; | |
6b6ec99a | 191 | inst->copy_range = NFULNL_COPY_RANGE_MAX; |
0597f268 | 192 | |
f5c5440d | 193 | hlist_add_head_rcu(&inst->hlist, |
9368a53c G |
194 | &log->instance_table[instance_hashfn(group_num)]); |
195 | ||
0597f268 | 196 | |
9368a53c | 197 | spin_unlock_bh(&log->instances_lock); |
0597f268 HW |
198 | |
199 | return inst; | |
200 | ||
0597f268 | 201 | out_unlock: |
9368a53c | 202 | spin_unlock_bh(&log->instances_lock); |
baab2ce7 | 203 | return ERR_PTR(err); |
0597f268 HW |
204 | } |
205 | ||
e3567061 | 206 | static void __nfulnl_flush(struct nfulnl_instance *inst); |
0597f268 | 207 | |
f5c5440d | 208 | /* called with BH disabled */ |
0597f268 | 209 | static void |
9afdb00c | 210 | __instance_destroy(struct nfulnl_instance *inst) |
0597f268 HW |
211 | { |
212 | /* first pull it out of the global list */ | |
f5c5440d | 213 | hlist_del_rcu(&inst->hlist); |
0597f268 | 214 | |
0597f268 HW |
215 | /* then flush all pending packets from skb */ |
216 | ||
f5c5440d ED |
217 | spin_lock(&inst->lock); |
218 | ||
219 | /* lockless readers wont be able to use us */ | |
220 | inst->copy_mode = NFULNL_COPY_DISABLED; | |
221 | ||
e3567061 MM |
222 | if (inst->skb) |
223 | __nfulnl_flush(inst); | |
f5c5440d | 224 | spin_unlock(&inst->lock); |
0597f268 HW |
225 | |
226 | /* and finally put the refcount */ | |
227 | instance_put(inst); | |
0597f268 HW |
228 | } |
229 | ||
0597f268 | 230 | static inline void |
9368a53c G |
231 | instance_destroy(struct nfnl_log_net *log, |
232 | struct nfulnl_instance *inst) | |
0597f268 | 233 | { |
9368a53c | 234 | spin_lock_bh(&log->instances_lock); |
9afdb00c | 235 | __instance_destroy(inst); |
9368a53c | 236 | spin_unlock_bh(&log->instances_lock); |
0597f268 HW |
237 | } |
238 | ||
239 | static int | |
240 | nfulnl_set_mode(struct nfulnl_instance *inst, u_int8_t mode, | |
241 | unsigned int range) | |
242 | { | |
243 | int status = 0; | |
244 | ||
245 | spin_lock_bh(&inst->lock); | |
601e68e1 | 246 | |
0597f268 HW |
247 | switch (mode) { |
248 | case NFULNL_COPY_NONE: | |
249 | case NFULNL_COPY_META: | |
250 | inst->copy_mode = mode; | |
251 | inst->copy_range = 0; | |
252 | break; | |
601e68e1 | 253 | |
0597f268 HW |
254 | case NFULNL_COPY_PACKET: |
255 | inst->copy_mode = mode; | |
c1e7dc91 FW |
256 | if (range == 0) |
257 | range = NFULNL_COPY_RANGE_MAX; | |
6b6ec99a MM |
258 | inst->copy_range = min_t(unsigned int, |
259 | range, NFULNL_COPY_RANGE_MAX); | |
0597f268 | 260 | break; |
601e68e1 | 261 | |
0597f268 HW |
262 | default: |
263 | status = -EINVAL; | |
264 | break; | |
265 | } | |
266 | ||
267 | spin_unlock_bh(&inst->lock); | |
268 | ||
269 | return status; | |
270 | } | |
271 | ||
272 | static int | |
273 | nfulnl_set_nlbufsiz(struct nfulnl_instance *inst, u_int32_t nlbufsiz) | |
274 | { | |
275 | int status; | |
276 | ||
277 | spin_lock_bh(&inst->lock); | |
278 | if (nlbufsiz < NFULNL_NLBUFSIZ_DEFAULT) | |
279 | status = -ERANGE; | |
280 | else if (nlbufsiz > 131072) | |
281 | status = -ERANGE; | |
282 | else { | |
283 | inst->nlbufsiz = nlbufsiz; | |
284 | status = 0; | |
285 | } | |
286 | spin_unlock_bh(&inst->lock); | |
287 | ||
288 | return status; | |
289 | } | |
290 | ||
291 | static int | |
292 | nfulnl_set_timeout(struct nfulnl_instance *inst, u_int32_t timeout) | |
293 | { | |
294 | spin_lock_bh(&inst->lock); | |
295 | inst->flushtimeout = timeout; | |
296 | spin_unlock_bh(&inst->lock); | |
297 | ||
298 | return 0; | |
299 | } | |
300 | ||
301 | static int | |
302 | nfulnl_set_qthresh(struct nfulnl_instance *inst, u_int32_t qthresh) | |
303 | { | |
304 | spin_lock_bh(&inst->lock); | |
305 | inst->qthreshold = qthresh; | |
306 | spin_unlock_bh(&inst->lock); | |
307 | ||
308 | return 0; | |
309 | } | |
310 | ||
0af5f6c1 HW |
311 | static int |
312 | nfulnl_set_flags(struct nfulnl_instance *inst, u_int16_t flags) | |
313 | { | |
314 | spin_lock_bh(&inst->lock); | |
ee433530 | 315 | inst->flags = flags; |
0af5f6c1 HW |
316 | spin_unlock_bh(&inst->lock); |
317 | ||
318 | return 0; | |
319 | } | |
320 | ||
c6a8f648 | 321 | static struct sk_buff * |
afff14f6 G |
322 | nfulnl_alloc_skb(struct net *net, u32 peer_portid, unsigned int inst_size, |
323 | unsigned int pkt_size) | |
0597f268 HW |
324 | { |
325 | struct sk_buff *skb; | |
ad2ad0f9 | 326 | unsigned int n; |
0597f268 | 327 | |
0597f268 HW |
328 | /* alloc skb which should be big enough for a whole multipart |
329 | * message. WARNING: has to be <= 128k due to slab restrictions */ | |
330 | ||
ad2ad0f9 | 331 | n = max(inst_size, pkt_size); |
afff14f6 | 332 | skb = nfnetlink_alloc_skb(net, n, peer_portid, GFP_ATOMIC); |
0597f268 | 333 | if (!skb) { |
ad2ad0f9 PM |
334 | if (n > pkt_size) { |
335 | /* try to allocate only as much as we need for current | |
336 | * packet */ | |
0597f268 | 337 | |
afff14f6 | 338 | skb = nfnetlink_alloc_skb(net, pkt_size, |
3ab1f683 | 339 | peer_portid, GFP_ATOMIC); |
ad2ad0f9 | 340 | if (!skb) |
0a9ee813 JP |
341 | pr_err("nfnetlink_log: can't even alloc %u bytes\n", |
342 | pkt_size); | |
ad2ad0f9 | 343 | } |
0597f268 HW |
344 | } |
345 | ||
346 | return skb; | |
347 | } | |
348 | ||
b51d3fa3 | 349 | static void |
0597f268 HW |
350 | __nfulnl_send(struct nfulnl_instance *inst) |
351 | { | |
d550d095 DM |
352 | if (inst->qlen > 1) { |
353 | struct nlmsghdr *nlh = nlmsg_put(inst->skb, 0, 0, | |
354 | NLMSG_DONE, | |
355 | sizeof(struct nfgenmsg), | |
356 | 0); | |
b51d3fa3 HL |
357 | if (WARN_ONCE(!nlh, "bad nlskb size: %u, tailroom %d\n", |
358 | inst->skb->len, skb_tailroom(inst->skb))) { | |
359 | kfree_skb(inst->skb); | |
d550d095 | 360 | goto out; |
b51d3fa3 | 361 | } |
d550d095 | 362 | } |
b51d3fa3 HL |
363 | nfnetlink_unicast(inst->skb, inst->net, inst->peer_portid, |
364 | MSG_DONTWAIT); | |
365 | out: | |
0597f268 HW |
366 | inst->qlen = 0; |
367 | inst->skb = NULL; | |
0597f268 HW |
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 | ||
e4d091d7 | 422 | memset(&pmsg, 0, sizeof(pmsg)); |
febf0a43 | 423 | pmsg.hw_protocol = skb->protocol; |
0597f268 HW |
424 | pmsg.hook = hooknum; |
425 | ||
1db20a52 DM |
426 | if (nla_put(inst->skb, NFULA_PACKET_HDR, sizeof(pmsg), &pmsg)) |
427 | goto nla_put_failure; | |
0597f268 | 428 | |
1db20a52 DM |
429 | if (prefix && |
430 | nla_put(inst->skb, NFULA_PREFIX, plen, prefix)) | |
431 | goto nla_put_failure; | |
0597f268 HW |
432 | |
433 | if (indev) { | |
1109a90c | 434 | #if !IS_ENABLED(CONFIG_BRIDGE_NETFILTER) |
1db20a52 DM |
435 | if (nla_put_be32(inst->skb, NFULA_IFINDEX_INDEV, |
436 | htonl(indev->ifindex))) | |
437 | goto nla_put_failure; | |
fbcd923c HW |
438 | #else |
439 | if (pf == PF_BRIDGE) { | |
440 | /* Case 1: outdev is physical input device, we need to | |
441 | * look for bridge group (when called from | |
442 | * netfilter_bridge) */ | |
1db20a52 DM |
443 | if (nla_put_be32(inst->skb, NFULA_IFINDEX_PHYSINDEV, |
444 | htonl(indev->ifindex)) || | |
fbcd923c | 445 | /* this is the bridge group "brX" */ |
f350a0a8 | 446 | /* rcu_read_lock()ed by nf_hook_slow or nf_log_packet */ |
1db20a52 DM |
447 | nla_put_be32(inst->skb, NFULA_IFINDEX_INDEV, |
448 | htonl(br_port_get_rcu(indev)->br->dev->ifindex))) | |
449 | goto nla_put_failure; | |
fbcd923c HW |
450 | } else { |
451 | /* Case 2: indev is bridge group, we need to look for | |
452 | * physical device (when called from ipv4) */ | |
1db20a52 DM |
453 | if (nla_put_be32(inst->skb, NFULA_IFINDEX_INDEV, |
454 | htonl(indev->ifindex))) | |
455 | goto nla_put_failure; | |
456 | if (skb->nf_bridge && skb->nf_bridge->physindev && | |
457 | nla_put_be32(inst->skb, NFULA_IFINDEX_PHYSINDEV, | |
458 | htonl(skb->nf_bridge->physindev->ifindex))) | |
459 | goto nla_put_failure; | |
fbcd923c HW |
460 | } |
461 | #endif | |
0597f268 HW |
462 | } |
463 | ||
464 | if (outdev) { | |
1109a90c | 465 | #if !IS_ENABLED(CONFIG_BRIDGE_NETFILTER) |
1db20a52 DM |
466 | if (nla_put_be32(inst->skb, NFULA_IFINDEX_OUTDEV, |
467 | htonl(outdev->ifindex))) | |
468 | goto nla_put_failure; | |
fbcd923c HW |
469 | #else |
470 | if (pf == PF_BRIDGE) { | |
471 | /* Case 1: outdev is physical output device, we need to | |
472 | * look for bridge group (when called from | |
473 | * netfilter_bridge) */ | |
1db20a52 DM |
474 | if (nla_put_be32(inst->skb, NFULA_IFINDEX_PHYSOUTDEV, |
475 | htonl(outdev->ifindex)) || | |
fbcd923c | 476 | /* this is the bridge group "brX" */ |
f350a0a8 | 477 | /* rcu_read_lock()ed by nf_hook_slow or nf_log_packet */ |
1db20a52 DM |
478 | nla_put_be32(inst->skb, NFULA_IFINDEX_OUTDEV, |
479 | htonl(br_port_get_rcu(outdev)->br->dev->ifindex))) | |
480 | goto nla_put_failure; | |
fbcd923c HW |
481 | } else { |
482 | /* Case 2: indev is a bridge group, we need to look | |
483 | * for physical device (when called from ipv4) */ | |
1db20a52 DM |
484 | if (nla_put_be32(inst->skb, NFULA_IFINDEX_OUTDEV, |
485 | htonl(outdev->ifindex))) | |
486 | goto nla_put_failure; | |
487 | if (skb->nf_bridge && skb->nf_bridge->physoutdev && | |
488 | nla_put_be32(inst->skb, NFULA_IFINDEX_PHYSOUTDEV, | |
489 | htonl(skb->nf_bridge->physoutdev->ifindex))) | |
490 | goto nla_put_failure; | |
fbcd923c HW |
491 | } |
492 | #endif | |
0597f268 HW |
493 | } |
494 | ||
1db20a52 DM |
495 | if (skb->mark && |
496 | nla_put_be32(inst->skb, NFULA_MARK, htonl(skb->mark))) | |
497 | goto nla_put_failure; | |
0597f268 | 498 | |
2c38de4c NC |
499 | if (indev && skb->dev && |
500 | skb->mac_header != skb->network_header) { | |
0597f268 | 501 | struct nfulnl_msg_packet_hw phw; |
e4d091d7 DC |
502 | int len; |
503 | ||
504 | memset(&phw, 0, sizeof(phw)); | |
505 | len = dev_parse_header(skb, phw.hw_addr); | |
b95cce35 SH |
506 | if (len > 0) { |
507 | phw.hw_addrlen = htons(len); | |
1db20a52 DM |
508 | if (nla_put(inst->skb, NFULA_HWADDR, sizeof(phw), &phw)) |
509 | goto nla_put_failure; | |
b95cce35 | 510 | } |
0597f268 HW |
511 | } |
512 | ||
72961ecf | 513 | if (indev && skb_mac_header_was_set(skb)) { |
2dba62c3 | 514 | if (nla_put_be16(inst->skb, NFULA_HWTYPE, htons(skb->dev->type)) || |
1db20a52 | 515 | nla_put_be16(inst->skb, NFULA_HWLEN, |
0c36b48b BH |
516 | htons(skb->dev->hard_header_len))) |
517 | goto nla_put_failure; | |
518 | ||
519 | hwhdrp = skb_mac_header(skb); | |
520 | ||
521 | if (skb->dev->type == ARPHRD_SIT) | |
522 | hwhdrp -= ETH_HLEN; | |
523 | ||
524 | if (hwhdrp >= skb->head && | |
525 | nla_put(inst->skb, NFULA_HWHEADER, | |
526 | skb->dev->hard_header_len, hwhdrp)) | |
1db20a52 | 527 | goto nla_put_failure; |
72961ecf EL |
528 | } |
529 | ||
b7aa0bf7 | 530 | if (skb->tstamp.tv64) { |
0597f268 | 531 | struct nfulnl_msg_packet_timestamp ts; |
b7aa0bf7 ED |
532 | struct timeval tv = ktime_to_timeval(skb->tstamp); |
533 | ts.sec = cpu_to_be64(tv.tv_sec); | |
534 | ts.usec = cpu_to_be64(tv.tv_usec); | |
0597f268 | 535 | |
1db20a52 DM |
536 | if (nla_put(inst->skb, NFULA_TIMESTAMP, sizeof(ts), &ts)) |
537 | goto nla_put_failure; | |
0597f268 HW |
538 | } |
539 | ||
540 | /* UID */ | |
0626af31 ED |
541 | sk = skb->sk; |
542 | if (sk && sk->sk_state != TCP_TIME_WAIT) { | |
543 | read_lock_bh(&sk->sk_callback_lock); | |
544 | if (sk->sk_socket && sk->sk_socket->file) { | |
545 | struct file *file = sk->sk_socket->file; | |
437589a7 LT |
546 | const struct cred *cred = file->f_cred; |
547 | struct user_namespace *user_ns = inst->peer_user_ns; | |
548 | __be32 uid = htonl(from_kuid_munged(user_ns, cred->fsuid)); | |
549 | __be32 gid = htonl(from_kgid_munged(user_ns, cred->fsgid)); | |
0626af31 | 550 | read_unlock_bh(&sk->sk_callback_lock); |
1db20a52 DM |
551 | if (nla_put_be32(inst->skb, NFULA_UID, uid) || |
552 | nla_put_be32(inst->skb, NFULA_GID, gid)) | |
553 | goto nla_put_failure; | |
0597f268 | 554 | } else |
0626af31 | 555 | read_unlock_bh(&sk->sk_callback_lock); |
0597f268 HW |
556 | } |
557 | ||
0af5f6c1 | 558 | /* local sequence number */ |
1db20a52 DM |
559 | if ((inst->flags & NFULNL_CFG_F_SEQ) && |
560 | nla_put_be32(inst->skb, NFULA_SEQ, htonl(inst->seq++))) | |
561 | goto nla_put_failure; | |
0dfedd28 | 562 | |
0af5f6c1 | 563 | /* global sequence number */ |
1db20a52 DM |
564 | if ((inst->flags & NFULNL_CFG_F_SEQ_GLOBAL) && |
565 | nla_put_be32(inst->skb, NFULA_SEQ_GLOBAL, | |
9368a53c | 566 | htonl(atomic_inc_return(&log->global_seq)))) |
1db20a52 | 567 | goto nla_put_failure; |
0af5f6c1 | 568 | |
0597f268 | 569 | if (data_len) { |
df6fb868 PM |
570 | struct nlattr *nla; |
571 | int size = nla_attr_size(data_len); | |
0597f268 | 572 | |
df6fb868 | 573 | if (skb_tailroom(inst->skb) < nla_total_size(data_len)) { |
0597f268 | 574 | printk(KERN_WARNING "nfnetlink_log: no tailroom!\n"); |
d550d095 | 575 | return -1; |
0597f268 HW |
576 | } |
577 | ||
df6fb868 PM |
578 | nla = (struct nlattr *)skb_put(inst->skb, nla_total_size(data_len)); |
579 | nla->nla_type = NFULA_PAYLOAD; | |
580 | nla->nla_len = size; | |
0597f268 | 581 | |
df6fb868 | 582 | if (skb_copy_bits(skb, 0, nla_data(nla), data_len)) |
0597f268 HW |
583 | BUG(); |
584 | } | |
601e68e1 | 585 | |
0597f268 HW |
586 | nlh->nlmsg_len = inst->skb->tail - old_tail; |
587 | return 0; | |
588 | ||
df6fb868 | 589 | nla_put_failure: |
0597f268 HW |
590 | PRINTR(KERN_ERR "nfnetlink_log: error creating log nlmsg\n"); |
591 | return -1; | |
592 | } | |
593 | ||
594 | #define RCV_SKB_FAIL(err) do { netlink_ack(skb, nlh, (err)); return; } while (0) | |
595 | ||
596 | static struct nf_loginfo default_loginfo = { | |
597 | .type = NF_LOG_TYPE_ULOG, | |
598 | .u = { | |
599 | .ulog = { | |
600 | .copy_len = 0xffff, | |
601 | .group = 0, | |
602 | .qthreshold = 1, | |
603 | }, | |
604 | }, | |
605 | }; | |
606 | ||
607 | /* log handler for internal netfilter logging api */ | |
5f7340ef | 608 | void |
8cdb46da HS |
609 | nfulnl_log_packet(struct net *net, |
610 | u_int8_t pf, | |
0597f268 HW |
611 | unsigned int hooknum, |
612 | const struct sk_buff *skb, | |
613 | const struct net_device *in, | |
614 | const struct net_device *out, | |
615 | const struct nf_loginfo *li_user, | |
616 | const char *prefix) | |
617 | { | |
618 | unsigned int size, data_len; | |
619 | struct nfulnl_instance *inst; | |
620 | const struct nf_loginfo *li; | |
621 | unsigned int qthreshold; | |
d7a5c324 | 622 | unsigned int plen; |
9368a53c | 623 | struct nfnl_log_net *log = nfnl_log_pernet(net); |
0597f268 | 624 | |
601e68e1 | 625 | if (li_user && li_user->type == NF_LOG_TYPE_ULOG) |
0597f268 HW |
626 | li = li_user; |
627 | else | |
628 | li = &default_loginfo; | |
629 | ||
9368a53c | 630 | inst = instance_lookup_get(log, li->u.ulog.group); |
0597f268 | 631 | if (!inst) |
0597f268 | 632 | return; |
0597f268 | 633 | |
d7a5c324 PM |
634 | plen = 0; |
635 | if (prefix) | |
881dbfe8 | 636 | plen = strlen(prefix) + 1; |
d7a5c324 | 637 | |
0597f268 HW |
638 | /* FIXME: do we want to make the size calculation conditional based on |
639 | * what is actually present? way more branches and checks, but more | |
640 | * memory efficient... */ | |
573ce260 | 641 | size = nlmsg_total_size(sizeof(struct nfgenmsg)) |
df6fb868 PM |
642 | + nla_total_size(sizeof(struct nfulnl_msg_packet_hdr)) |
643 | + nla_total_size(sizeof(u_int32_t)) /* ifindex */ | |
644 | + nla_total_size(sizeof(u_int32_t)) /* ifindex */ | |
1109a90c | 645 | #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER) |
df6fb868 PM |
646 | + nla_total_size(sizeof(u_int32_t)) /* ifindex */ |
647 | + nla_total_size(sizeof(u_int32_t)) /* ifindex */ | |
fbcd923c | 648 | #endif |
df6fb868 PM |
649 | + nla_total_size(sizeof(u_int32_t)) /* mark */ |
650 | + nla_total_size(sizeof(u_int32_t)) /* uid */ | |
76aa1ce1 | 651 | + nla_total_size(sizeof(u_int32_t)) /* gid */ |
df6fb868 PM |
652 | + nla_total_size(plen) /* prefix */ |
653 | + nla_total_size(sizeof(struct nfulnl_msg_packet_hw)) | |
9dfa1dfe FW |
654 | + nla_total_size(sizeof(struct nfulnl_msg_packet_timestamp)) |
655 | + nla_total_size(sizeof(struct nfgenmsg)); /* NLMSG_DONE */ | |
0597f268 | 656 | |
eeff9bee PNA |
657 | if (in && skb_mac_header_was_set(skb)) { |
658 | size += nla_total_size(skb->dev->hard_header_len) | |
659 | + nla_total_size(sizeof(u_int16_t)) /* hwtype */ | |
660 | + nla_total_size(sizeof(u_int16_t)); /* hwlen */ | |
661 | } | |
662 | ||
0597f268 HW |
663 | spin_lock_bh(&inst->lock); |
664 | ||
0af5f6c1 | 665 | if (inst->flags & NFULNL_CFG_F_SEQ) |
df6fb868 | 666 | size += nla_total_size(sizeof(u_int32_t)); |
0af5f6c1 | 667 | if (inst->flags & NFULNL_CFG_F_SEQ_GLOBAL) |
df6fb868 | 668 | size += nla_total_size(sizeof(u_int32_t)); |
0af5f6c1 | 669 | |
0597f268 HW |
670 | qthreshold = inst->qthreshold; |
671 | /* per-rule qthreshold overrides per-instance */ | |
5ca431f9 EL |
672 | if (li->u.ulog.qthreshold) |
673 | if (qthreshold > li->u.ulog.qthreshold) | |
674 | qthreshold = li->u.ulog.qthreshold; | |
675 | ||
601e68e1 | 676 | |
0597f268 HW |
677 | switch (inst->copy_mode) { |
678 | case NFULNL_COPY_META: | |
679 | case NFULNL_COPY_NONE: | |
680 | data_len = 0; | |
681 | break; | |
601e68e1 | 682 | |
0597f268 | 683 | case NFULNL_COPY_PACKET: |
c1e7dc91 | 684 | if (inst->copy_range > skb->len) |
0597f268 HW |
685 | data_len = skb->len; |
686 | else | |
687 | data_len = inst->copy_range; | |
601e68e1 | 688 | |
df6fb868 | 689 | size += nla_total_size(data_len); |
0597f268 | 690 | break; |
601e68e1 | 691 | |
f5c5440d | 692 | case NFULNL_COPY_DISABLED: |
0597f268 | 693 | default: |
55b5a91e | 694 | goto unlock_and_release; |
0597f268 HW |
695 | } |
696 | ||
9dfa1dfe | 697 | if (inst->skb && size > skb_tailroom(inst->skb)) { |
0597f268 HW |
698 | /* either the queue len is too high or we don't have |
699 | * enough room in the skb left. flush to userspace. */ | |
e3567061 | 700 | __nfulnl_flush(inst); |
55b5a91e | 701 | } |
0597f268 | 702 | |
55b5a91e | 703 | if (!inst->skb) { |
afff14f6 G |
704 | inst->skb = nfulnl_alloc_skb(net, inst->peer_portid, |
705 | inst->nlbufsiz, size); | |
55b5a91e | 706 | if (!inst->skb) |
0597f268 | 707 | goto alloc_failure; |
0597f268 HW |
708 | } |
709 | ||
0597f268 HW |
710 | inst->qlen++; |
711 | ||
9368a53c | 712 | __build_packet_message(log, inst, skb, data_len, pf, |
8248779b | 713 | hooknum, in, out, prefix, plen); |
0597f268 | 714 | |
d63b043d MM |
715 | if (inst->qlen >= qthreshold) |
716 | __nfulnl_flush(inst); | |
0597f268 HW |
717 | /* timer_pending always called within inst->lock, so there |
718 | * is no chance of a race here */ | |
d63b043d | 719 | else if (!timer_pending(&inst->timer)) { |
0597f268 HW |
720 | instance_get(inst); |
721 | inst->timer.expires = jiffies + (inst->flushtimeout*HZ/100); | |
722 | add_timer(&inst->timer); | |
723 | } | |
0597f268 | 724 | |
ed32abea MM |
725 | unlock_and_release: |
726 | spin_unlock_bh(&inst->lock); | |
727 | instance_put(inst); | |
0597f268 HW |
728 | return; |
729 | ||
730 | alloc_failure: | |
0597f268 | 731 | /* FIXME: statistics */ |
ed32abea | 732 | goto unlock_and_release; |
0597f268 | 733 | } |
5f7340ef | 734 | EXPORT_SYMBOL_GPL(nfulnl_log_packet); |
0597f268 HW |
735 | |
736 | static int | |
737 | nfulnl_rcv_nl_event(struct notifier_block *this, | |
738 | unsigned long event, void *ptr) | |
739 | { | |
740 | struct netlink_notify *n = ptr; | |
9368a53c | 741 | struct nfnl_log_net *log = nfnl_log_pernet(n->net); |
0597f268 | 742 | |
dee5817e | 743 | if (event == NETLINK_URELEASE && n->protocol == NETLINK_NETFILTER) { |
0597f268 HW |
744 | int i; |
745 | ||
15e47304 | 746 | /* destroy all instances for this portid */ |
9368a53c | 747 | spin_lock_bh(&log->instances_lock); |
0597f268 | 748 | for (i = 0; i < INSTANCE_BUCKETS; i++) { |
b67bfe0d | 749 | struct hlist_node *t2; |
0597f268 | 750 | struct nfulnl_instance *inst; |
9368a53c | 751 | struct hlist_head *head = &log->instance_table[i]; |
0597f268 | 752 | |
b67bfe0d | 753 | hlist_for_each_entry_safe(inst, t2, head, hlist) { |
9368a53c | 754 | if (n->portid == inst->peer_portid) |
0597f268 HW |
755 | __instance_destroy(inst); |
756 | } | |
757 | } | |
9368a53c | 758 | spin_unlock_bh(&log->instances_lock); |
0597f268 HW |
759 | } |
760 | return NOTIFY_DONE; | |
761 | } | |
762 | ||
763 | static struct notifier_block nfulnl_rtnl_notifier = { | |
764 | .notifier_call = nfulnl_rcv_nl_event, | |
765 | }; | |
766 | ||
767 | static int | |
768 | nfulnl_recv_unsupp(struct sock *ctnl, struct sk_buff *skb, | |
39938324 PM |
769 | const struct nlmsghdr *nlh, |
770 | const struct nlattr * const nfqa[]) | |
0597f268 HW |
771 | { |
772 | return -ENOTSUPP; | |
773 | } | |
774 | ||
ca735b3a | 775 | static struct nf_logger nfulnl_logger __read_mostly = { |
0597f268 | 776 | .name = "nfnetlink_log", |
5962815a | 777 | .type = NF_LOG_TYPE_ULOG, |
0597f268 HW |
778 | .logfn = &nfulnl_log_packet, |
779 | .me = THIS_MODULE, | |
780 | }; | |
781 | ||
fd8281ad PM |
782 | static const struct nla_policy nfula_cfg_policy[NFULA_CFG_MAX+1] = { |
783 | [NFULA_CFG_CMD] = { .len = sizeof(struct nfulnl_msg_config_cmd) }, | |
784 | [NFULA_CFG_MODE] = { .len = sizeof(struct nfulnl_msg_config_mode) }, | |
785 | [NFULA_CFG_TIMEOUT] = { .type = NLA_U32 }, | |
786 | [NFULA_CFG_QTHRESH] = { .type = NLA_U32 }, | |
787 | [NFULA_CFG_NLBUFSIZ] = { .type = NLA_U32 }, | |
788 | [NFULA_CFG_FLAGS] = { .type = NLA_U16 }, | |
0597f268 HW |
789 | }; |
790 | ||
791 | static int | |
792 | nfulnl_recv_config(struct sock *ctnl, struct sk_buff *skb, | |
39938324 PM |
793 | const struct nlmsghdr *nlh, |
794 | const struct nlattr * const nfula[]) | |
0597f268 | 795 | { |
d550d095 | 796 | struct nfgenmsg *nfmsg = nlmsg_data(nlh); |
0597f268 HW |
797 | u_int16_t group_num = ntohs(nfmsg->res_id); |
798 | struct nfulnl_instance *inst; | |
b7047a1c | 799 | struct nfulnl_msg_config_cmd *cmd = NULL; |
30e0c6a6 | 800 | struct net *net = sock_net(ctnl); |
9368a53c | 801 | struct nfnl_log_net *log = nfnl_log_pernet(net); |
0597f268 HW |
802 | int ret = 0; |
803 | ||
b7047a1c PM |
804 | if (nfula[NFULA_CFG_CMD]) { |
805 | u_int8_t pf = nfmsg->nfgen_family; | |
806 | cmd = nla_data(nfula[NFULA_CFG_CMD]); | |
807 | ||
808 | /* Commands without queue context */ | |
809 | switch (cmd->command) { | |
810 | case NFULNL_CFG_CMD_PF_BIND: | |
30e0c6a6 | 811 | return nf_log_bind_pf(net, pf, &nfulnl_logger); |
b7047a1c | 812 | case NFULNL_CFG_CMD_PF_UNBIND: |
30e0c6a6 | 813 | nf_log_unbind_pf(net, pf); |
b7047a1c PM |
814 | return 0; |
815 | } | |
816 | } | |
817 | ||
9368a53c | 818 | inst = instance_lookup_get(log, group_num); |
15e47304 | 819 | if (inst && inst->peer_portid != NETLINK_CB(skb).portid) { |
c0506365 PM |
820 | ret = -EPERM; |
821 | goto out_put; | |
822 | } | |
823 | ||
b7047a1c | 824 | if (cmd != NULL) { |
0597f268 HW |
825 | switch (cmd->command) { |
826 | case NFULNL_CFG_CMD_BIND: | |
827 | if (inst) { | |
828 | ret = -EBUSY; | |
829 | goto out_put; | |
830 | } | |
831 | ||
9368a53c | 832 | inst = instance_create(net, group_num, |
15e47304 | 833 | NETLINK_CB(skb).portid, |
e32123e5 | 834 | sk_user_ns(NETLINK_CB(skb).sk)); |
baab2ce7 PM |
835 | if (IS_ERR(inst)) { |
836 | ret = PTR_ERR(inst); | |
f414c16c | 837 | goto out; |
0597f268 HW |
838 | } |
839 | break; | |
840 | case NFULNL_CFG_CMD_UNBIND: | |
841 | if (!inst) { | |
842 | ret = -ENODEV; | |
f414c16c | 843 | goto out; |
0597f268 HW |
844 | } |
845 | ||
9368a53c | 846 | instance_destroy(log, inst); |
a49c6503 | 847 | goto out_put; |
0597f268 | 848 | default: |
cd21f0ac | 849 | ret = -ENOTSUPP; |
0597f268 HW |
850 | break; |
851 | } | |
0597f268 HW |
852 | } |
853 | ||
df6fb868 | 854 | if (nfula[NFULA_CFG_MODE]) { |
0597f268 | 855 | struct nfulnl_msg_config_mode *params; |
df6fb868 | 856 | params = nla_data(nfula[NFULA_CFG_MODE]); |
0597f268 | 857 | |
c0506365 PM |
858 | if (!inst) { |
859 | ret = -ENODEV; | |
860 | goto out; | |
861 | } | |
0597f268 | 862 | nfulnl_set_mode(inst, params->copy_mode, |
d1208b99 | 863 | ntohl(params->copy_range)); |
0597f268 HW |
864 | } |
865 | ||
df6fb868 | 866 | if (nfula[NFULA_CFG_TIMEOUT]) { |
0dfedd28 | 867 | __be32 timeout = nla_get_be32(nfula[NFULA_CFG_TIMEOUT]); |
0597f268 | 868 | |
c0506365 PM |
869 | if (!inst) { |
870 | ret = -ENODEV; | |
871 | goto out; | |
872 | } | |
0597f268 HW |
873 | nfulnl_set_timeout(inst, ntohl(timeout)); |
874 | } | |
875 | ||
df6fb868 | 876 | if (nfula[NFULA_CFG_NLBUFSIZ]) { |
0dfedd28 | 877 | __be32 nlbufsiz = nla_get_be32(nfula[NFULA_CFG_NLBUFSIZ]); |
0597f268 | 878 | |
c0506365 PM |
879 | if (!inst) { |
880 | ret = -ENODEV; | |
881 | goto out; | |
882 | } | |
0597f268 HW |
883 | nfulnl_set_nlbufsiz(inst, ntohl(nlbufsiz)); |
884 | } | |
885 | ||
df6fb868 | 886 | if (nfula[NFULA_CFG_QTHRESH]) { |
0dfedd28 | 887 | __be32 qthresh = nla_get_be32(nfula[NFULA_CFG_QTHRESH]); |
0597f268 | 888 | |
c0506365 PM |
889 | if (!inst) { |
890 | ret = -ENODEV; | |
891 | goto out; | |
892 | } | |
0597f268 HW |
893 | nfulnl_set_qthresh(inst, ntohl(qthresh)); |
894 | } | |
895 | ||
df6fb868 | 896 | if (nfula[NFULA_CFG_FLAGS]) { |
0dfedd28 | 897 | __be16 flags = nla_get_be16(nfula[NFULA_CFG_FLAGS]); |
c0506365 PM |
898 | |
899 | if (!inst) { | |
900 | ret = -ENODEV; | |
901 | goto out; | |
902 | } | |
ee433530 | 903 | nfulnl_set_flags(inst, ntohs(flags)); |
0af5f6c1 HW |
904 | } |
905 | ||
0597f268 HW |
906 | out_put: |
907 | instance_put(inst); | |
dd16704e | 908 | out: |
0597f268 HW |
909 | return ret; |
910 | } | |
911 | ||
7c8d4cb4 | 912 | static const struct nfnl_callback nfulnl_cb[NFULNL_MSG_MAX] = { |
0597f268 | 913 | [NFULNL_MSG_PACKET] = { .call = nfulnl_recv_unsupp, |
37d2e7a2 | 914 | .attr_count = NFULA_MAX, }, |
0597f268 | 915 | [NFULNL_MSG_CONFIG] = { .call = nfulnl_recv_config, |
fd8281ad PM |
916 | .attr_count = NFULA_CFG_MAX, |
917 | .policy = nfula_cfg_policy }, | |
0597f268 HW |
918 | }; |
919 | ||
7c8d4cb4 | 920 | static const struct nfnetlink_subsystem nfulnl_subsys = { |
0597f268 HW |
921 | .name = "log", |
922 | .subsys_id = NFNL_SUBSYS_ULOG, | |
923 | .cb_count = NFULNL_MSG_MAX, | |
0597f268 HW |
924 | .cb = nfulnl_cb, |
925 | }; | |
926 | ||
927 | #ifdef CONFIG_PROC_FS | |
928 | struct iter_state { | |
9368a53c | 929 | struct seq_net_private p; |
0597f268 HW |
930 | unsigned int bucket; |
931 | }; | |
932 | ||
9368a53c | 933 | static struct hlist_node *get_first(struct net *net, struct iter_state *st) |
0597f268 | 934 | { |
9368a53c | 935 | struct nfnl_log_net *log; |
0597f268 HW |
936 | if (!st) |
937 | return NULL; | |
938 | ||
9368a53c G |
939 | log = nfnl_log_pernet(net); |
940 | ||
0597f268 | 941 | for (st->bucket = 0; st->bucket < INSTANCE_BUCKETS; st->bucket++) { |
9368a53c G |
942 | struct hlist_head *head = &log->instance_table[st->bucket]; |
943 | ||
944 | if (!hlist_empty(head)) | |
945 | return rcu_dereference_bh(hlist_first_rcu(head)); | |
0597f268 HW |
946 | } |
947 | return NULL; | |
948 | } | |
949 | ||
9368a53c G |
950 | static struct hlist_node *get_next(struct net *net, struct iter_state *st, |
951 | struct hlist_node *h) | |
0597f268 | 952 | { |
0e60ebe0 | 953 | h = rcu_dereference_bh(hlist_next_rcu(h)); |
0597f268 | 954 | while (!h) { |
9368a53c G |
955 | struct nfnl_log_net *log; |
956 | struct hlist_head *head; | |
957 | ||
0597f268 HW |
958 | if (++st->bucket >= INSTANCE_BUCKETS) |
959 | return NULL; | |
960 | ||
9368a53c G |
961 | log = nfnl_log_pernet(net); |
962 | head = &log->instance_table[st->bucket]; | |
963 | h = rcu_dereference_bh(hlist_first_rcu(head)); | |
0597f268 HW |
964 | } |
965 | return h; | |
966 | } | |
967 | ||
9368a53c G |
968 | static struct hlist_node *get_idx(struct net *net, struct iter_state *st, |
969 | loff_t pos) | |
0597f268 HW |
970 | { |
971 | struct hlist_node *head; | |
9368a53c | 972 | head = get_first(net, st); |
0597f268 HW |
973 | |
974 | if (head) | |
9368a53c | 975 | while (pos && (head = get_next(net, st, head))) |
0597f268 HW |
976 | pos--; |
977 | return pos ? NULL : head; | |
978 | } | |
979 | ||
9368a53c | 980 | static void *seq_start(struct seq_file *s, loff_t *pos) |
bed1be20 | 981 | __acquires(rcu_bh) |
0597f268 | 982 | { |
bed1be20 | 983 | rcu_read_lock_bh(); |
9368a53c | 984 | return get_idx(seq_file_net(s), s->private, *pos); |
0597f268 HW |
985 | } |
986 | ||
987 | static void *seq_next(struct seq_file *s, void *v, loff_t *pos) | |
988 | { | |
989 | (*pos)++; | |
9368a53c | 990 | return get_next(seq_file_net(s), s->private, v); |
0597f268 HW |
991 | } |
992 | ||
993 | static void seq_stop(struct seq_file *s, void *v) | |
bed1be20 | 994 | __releases(rcu_bh) |
0597f268 | 995 | { |
bed1be20 | 996 | rcu_read_unlock_bh(); |
0597f268 HW |
997 | } |
998 | ||
999 | static int seq_show(struct seq_file *s, void *v) | |
1000 | { | |
1001 | const struct nfulnl_instance *inst = v; | |
1002 | ||
601e68e1 | 1003 | return seq_printf(s, "%5d %6d %5d %1d %5d %6d %2d\n", |
0597f268 | 1004 | inst->group_num, |
15e47304 | 1005 | inst->peer_portid, inst->qlen, |
0597f268 HW |
1006 | inst->copy_mode, inst->copy_range, |
1007 | inst->flushtimeout, atomic_read(&inst->use)); | |
1008 | } | |
1009 | ||
56b3d975 | 1010 | static const struct seq_operations nful_seq_ops = { |
0597f268 HW |
1011 | .start = seq_start, |
1012 | .next = seq_next, | |
1013 | .stop = seq_stop, | |
1014 | .show = seq_show, | |
1015 | }; | |
1016 | ||
1017 | static int nful_open(struct inode *inode, struct file *file) | |
1018 | { | |
9368a53c G |
1019 | return seq_open_net(inode, file, &nful_seq_ops, |
1020 | sizeof(struct iter_state)); | |
0597f268 HW |
1021 | } |
1022 | ||
da7071d7 | 1023 | static const struct file_operations nful_file_ops = { |
0597f268 HW |
1024 | .owner = THIS_MODULE, |
1025 | .open = nful_open, | |
1026 | .read = seq_read, | |
1027 | .llseek = seq_lseek, | |
9368a53c | 1028 | .release = seq_release_net, |
0597f268 HW |
1029 | }; |
1030 | ||
1031 | #endif /* PROC_FS */ | |
1032 | ||
9368a53c | 1033 | static int __net_init nfnl_log_net_init(struct net *net) |
0597f268 | 1034 | { |
9368a53c G |
1035 | unsigned int i; |
1036 | struct nfnl_log_net *log = nfnl_log_pernet(net); | |
601e68e1 | 1037 | |
0597f268 | 1038 | for (i = 0; i < INSTANCE_BUCKETS; i++) |
9368a53c G |
1039 | INIT_HLIST_HEAD(&log->instance_table[i]); |
1040 | spin_lock_init(&log->instances_lock); | |
1041 | ||
1042 | #ifdef CONFIG_PROC_FS | |
1043 | if (!proc_create("nfnetlink_log", 0440, | |
1044 | net->nf.proc_netfilter, &nful_file_ops)) | |
1045 | return -ENOMEM; | |
1046 | #endif | |
1047 | return 0; | |
1048 | } | |
1049 | ||
1050 | static void __net_exit nfnl_log_net_exit(struct net *net) | |
1051 | { | |
e778f56e | 1052 | #ifdef CONFIG_PROC_FS |
9368a53c | 1053 | remove_proc_entry("nfnetlink_log", net->nf.proc_netfilter); |
e778f56e | 1054 | #endif |
45c2aff6 | 1055 | nf_log_unset(net, &nfulnl_logger); |
9368a53c G |
1056 | } |
1057 | ||
1058 | static struct pernet_operations nfnl_log_net_ops = { | |
1059 | .init = nfnl_log_net_init, | |
1060 | .exit = nfnl_log_net_exit, | |
1061 | .id = &nfnl_log_net_id, | |
1062 | .size = sizeof(struct nfnl_log_net), | |
1063 | }; | |
1064 | ||
1065 | static int __init nfnetlink_log_init(void) | |
1066 | { | |
1067 | int status = -ENOMEM; | |
601e68e1 | 1068 | |
0597f268 HW |
1069 | 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); |
fab4085f PNA |
1110 | MODULE_ALIAS_NF_LOGGER(AF_INET, 1); |
1111 | MODULE_ALIAS_NF_LOGGER(AF_INET6, 1); | |
1112 | MODULE_ALIAS_NF_LOGGER(AF_BRIDGE, 1); | |
0597f268 | 1113 | |
65b4b4e8 AM |
1114 | module_init(nfnetlink_log_init); |
1115 | module_exit(nfnetlink_log_fini); |