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 | 14 | */ |
beacd3e8 ML |
15 | |
16 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt | |
17 | ||
0597f268 HW |
18 | #include <linux/module.h> |
19 | #include <linux/skbuff.h> | |
e035edd1 | 20 | #include <linux/if_arp.h> |
0597f268 HW |
21 | #include <linux/init.h> |
22 | #include <linux/ip.h> | |
23 | #include <linux/ipv6.h> | |
24 | #include <linux/netdevice.h> | |
25 | #include <linux/netfilter.h> | |
c737b7c4 | 26 | #include <linux/netfilter_bridge.h> |
573ce260 | 27 | #include <net/netlink.h> |
0597f268 HW |
28 | #include <linux/netfilter/nfnetlink.h> |
29 | #include <linux/netfilter/nfnetlink_log.h> | |
30 | #include <linux/spinlock.h> | |
31 | #include <linux/sysctl.h> | |
32 | #include <linux/proc_fs.h> | |
33 | #include <linux/security.h> | |
34 | #include <linux/list.h> | |
5a0e3ad6 | 35 | #include <linux/slab.h> |
0597f268 | 36 | #include <net/sock.h> |
f01ffbd6 | 37 | #include <net/netfilter/nf_log.h> |
9368a53c | 38 | #include <net/netns/generic.h> |
d9e15007 | 39 | #include <net/netfilter/nfnetlink_log.h> |
0597f268 | 40 | |
60063497 | 41 | #include <linux/atomic.h> |
0597f268 | 42 | |
1109a90c | 43 | #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER) |
fbcd923c HW |
44 | #include "../bridge/br_private.h" |
45 | #endif | |
46 | ||
c2db2924 | 47 | #define NFULNL_NLBUFSIZ_DEFAULT NLMSG_GOODSIZE |
2c6764b7 | 48 | #define NFULNL_TIMEOUT_DEFAULT 100 /* every second */ |
0597f268 | 49 | #define NFULNL_QTHRESH_DEFAULT 100 /* 100 packets */ |
c1e7dc91 FW |
50 | /* max packet size is limited by 16-bit struct nfattr nfa_len field */ |
51 | #define NFULNL_COPY_RANGE_MAX (0xFFFF - NLA_HDRLEN) | |
0597f268 HW |
52 | |
53 | #define PRINTR(x, args...) do { if (net_ratelimit()) \ | |
54 | printk(x, ## args); } while (0); | |
55 | ||
0597f268 HW |
56 | struct nfulnl_instance { |
57 | struct hlist_node hlist; /* global list of instances */ | |
58 | spinlock_t lock; | |
59 | atomic_t use; /* use count */ | |
60 | ||
61 | unsigned int qlen; /* number of nlmsgs in skb */ | |
62 | struct sk_buff *skb; /* pre-allocatd skb */ | |
0597f268 | 63 | struct timer_list timer; |
9368a53c | 64 | struct net *net; |
9eea9515 | 65 | struct user_namespace *peer_user_ns; /* User namespace of the peer process */ |
cc6bc448 | 66 | u32 peer_portid; /* PORTID of the peer process */ |
0597f268 HW |
67 | |
68 | /* configurable parameters */ | |
69 | unsigned int flushtimeout; /* timeout until queue flush */ | |
70 | unsigned int nlbufsiz; /* netlink buffer allocation size */ | |
71 | unsigned int qthreshold; /* threshold of the queue */ | |
72 | u_int32_t copy_range; | |
0af5f6c1 | 73 | u_int32_t seq; /* instance-local sequential counter */ |
0597f268 | 74 | u_int16_t group_num; /* number of this queue */ |
0af5f6c1 | 75 | u_int16_t flags; |
601e68e1 | 76 | u_int8_t copy_mode; |
bed1be20 | 77 | struct rcu_head rcu; |
0597f268 HW |
78 | }; |
79 | ||
0597f268 | 80 | #define INSTANCE_BUCKETS 16 |
0597f268 | 81 | |
9368a53c G |
82 | static int nfnl_log_net_id __read_mostly; |
83 | ||
84 | struct nfnl_log_net { | |
85 | spinlock_t instances_lock; | |
86 | struct hlist_head instance_table[INSTANCE_BUCKETS]; | |
87 | atomic_t global_seq; | |
88 | }; | |
89 | ||
90 | static struct nfnl_log_net *nfnl_log_pernet(struct net *net) | |
91 | { | |
92 | return net_generic(net, nfnl_log_net_id); | |
93 | } | |
94 | ||
0597f268 HW |
95 | static inline u_int8_t instance_hashfn(u_int16_t group_num) |
96 | { | |
97 | return ((group_num & 0xff) % INSTANCE_BUCKETS); | |
98 | } | |
99 | ||
100 | static struct nfulnl_instance * | |
9368a53c | 101 | __instance_lookup(struct nfnl_log_net *log, u_int16_t group_num) |
0597f268 HW |
102 | { |
103 | struct hlist_head *head; | |
0597f268 HW |
104 | struct nfulnl_instance *inst; |
105 | ||
9368a53c | 106 | head = &log->instance_table[instance_hashfn(group_num)]; |
b67bfe0d | 107 | hlist_for_each_entry_rcu(inst, head, hlist) { |
0597f268 HW |
108 | if (inst->group_num == group_num) |
109 | return inst; | |
110 | } | |
111 | return NULL; | |
112 | } | |
113 | ||
114 | static inline void | |
115 | instance_get(struct nfulnl_instance *inst) | |
116 | { | |
117 | atomic_inc(&inst->use); | |
118 | } | |
119 | ||
120 | static struct nfulnl_instance * | |
9368a53c | 121 | instance_lookup_get(struct nfnl_log_net *log, u_int16_t group_num) |
0597f268 HW |
122 | { |
123 | struct nfulnl_instance *inst; | |
124 | ||
bed1be20 | 125 | rcu_read_lock_bh(); |
9368a53c | 126 | inst = __instance_lookup(log, group_num); |
f5c5440d ED |
127 | if (inst && !atomic_inc_not_zero(&inst->use)) |
128 | inst = NULL; | |
bed1be20 | 129 | rcu_read_unlock_bh(); |
0597f268 HW |
130 | |
131 | return inst; | |
132 | } | |
133 | ||
bed1be20 ED |
134 | static void nfulnl_instance_free_rcu(struct rcu_head *head) |
135 | { | |
9368a53c G |
136 | struct nfulnl_instance *inst = |
137 | container_of(head, struct nfulnl_instance, rcu); | |
138 | ||
139 | put_net(inst->net); | |
140 | kfree(inst); | |
bed1be20 ED |
141 | module_put(THIS_MODULE); |
142 | } | |
143 | ||
0597f268 HW |
144 | static void |
145 | instance_put(struct nfulnl_instance *inst) | |
146 | { | |
bed1be20 ED |
147 | if (inst && atomic_dec_and_test(&inst->use)) |
148 | call_rcu_bh(&inst->rcu, nfulnl_instance_free_rcu); | |
0597f268 HW |
149 | } |
150 | ||
151 | static void nfulnl_timer(unsigned long data); | |
152 | ||
153 | static struct nfulnl_instance * | |
9368a53c | 154 | instance_create(struct net *net, u_int16_t group_num, |
cc6bc448 | 155 | u32 portid, struct user_namespace *user_ns) |
0597f268 HW |
156 | { |
157 | struct nfulnl_instance *inst; | |
9368a53c | 158 | struct nfnl_log_net *log = nfnl_log_pernet(net); |
baab2ce7 | 159 | int err; |
0597f268 | 160 | |
9368a53c G |
161 | spin_lock_bh(&log->instances_lock); |
162 | if (__instance_lookup(log, group_num)) { | |
baab2ce7 | 163 | err = -EEXIST; |
0597f268 HW |
164 | goto out_unlock; |
165 | } | |
166 | ||
10dfdc69 | 167 | inst = kzalloc(sizeof(*inst), GFP_ATOMIC); |
baab2ce7 PM |
168 | if (!inst) { |
169 | err = -ENOMEM; | |
0597f268 | 170 | goto out_unlock; |
baab2ce7 | 171 | } |
0597f268 | 172 | |
aace57e0 MM |
173 | if (!try_module_get(THIS_MODULE)) { |
174 | kfree(inst); | |
baab2ce7 | 175 | err = -EAGAIN; |
aace57e0 MM |
176 | goto out_unlock; |
177 | } | |
178 | ||
0597f268 | 179 | INIT_HLIST_NODE(&inst->hlist); |
181a46a5 | 180 | spin_lock_init(&inst->lock); |
0597f268 HW |
181 | /* needs to be two, since we _put() after creation */ |
182 | atomic_set(&inst->use, 2); | |
183 | ||
e6f689db | 184 | setup_timer(&inst->timer, nfulnl_timer, (unsigned long)inst); |
0597f268 | 185 | |
9368a53c | 186 | inst->net = get_net(net); |
9eea9515 | 187 | inst->peer_user_ns = user_ns; |
15e47304 | 188 | inst->peer_portid = portid; |
0597f268 HW |
189 | inst->group_num = group_num; |
190 | ||
191 | inst->qthreshold = NFULNL_QTHRESH_DEFAULT; | |
192 | inst->flushtimeout = NFULNL_TIMEOUT_DEFAULT; | |
193 | inst->nlbufsiz = NFULNL_NLBUFSIZ_DEFAULT; | |
194 | inst->copy_mode = NFULNL_COPY_PACKET; | |
6b6ec99a | 195 | inst->copy_range = NFULNL_COPY_RANGE_MAX; |
0597f268 | 196 | |
f5c5440d | 197 | hlist_add_head_rcu(&inst->hlist, |
9368a53c G |
198 | &log->instance_table[instance_hashfn(group_num)]); |
199 | ||
0597f268 | 200 | |
9368a53c | 201 | spin_unlock_bh(&log->instances_lock); |
0597f268 HW |
202 | |
203 | return inst; | |
204 | ||
0597f268 | 205 | out_unlock: |
9368a53c | 206 | spin_unlock_bh(&log->instances_lock); |
baab2ce7 | 207 | return ERR_PTR(err); |
0597f268 HW |
208 | } |
209 | ||
e3567061 | 210 | static void __nfulnl_flush(struct nfulnl_instance *inst); |
0597f268 | 211 | |
f5c5440d | 212 | /* called with BH disabled */ |
0597f268 | 213 | static void |
9afdb00c | 214 | __instance_destroy(struct nfulnl_instance *inst) |
0597f268 HW |
215 | { |
216 | /* first pull it out of the global list */ | |
f5c5440d | 217 | hlist_del_rcu(&inst->hlist); |
0597f268 | 218 | |
0597f268 HW |
219 | /* then flush all pending packets from skb */ |
220 | ||
f5c5440d ED |
221 | spin_lock(&inst->lock); |
222 | ||
223 | /* lockless readers wont be able to use us */ | |
224 | inst->copy_mode = NFULNL_COPY_DISABLED; | |
225 | ||
e3567061 MM |
226 | if (inst->skb) |
227 | __nfulnl_flush(inst); | |
f5c5440d | 228 | spin_unlock(&inst->lock); |
0597f268 HW |
229 | |
230 | /* and finally put the refcount */ | |
231 | instance_put(inst); | |
0597f268 HW |
232 | } |
233 | ||
0597f268 | 234 | static inline void |
9368a53c G |
235 | instance_destroy(struct nfnl_log_net *log, |
236 | struct nfulnl_instance *inst) | |
0597f268 | 237 | { |
9368a53c | 238 | spin_lock_bh(&log->instances_lock); |
9afdb00c | 239 | __instance_destroy(inst); |
9368a53c | 240 | spin_unlock_bh(&log->instances_lock); |
0597f268 HW |
241 | } |
242 | ||
243 | static int | |
244 | nfulnl_set_mode(struct nfulnl_instance *inst, u_int8_t mode, | |
245 | unsigned int range) | |
246 | { | |
247 | int status = 0; | |
248 | ||
249 | spin_lock_bh(&inst->lock); | |
601e68e1 | 250 | |
0597f268 HW |
251 | switch (mode) { |
252 | case NFULNL_COPY_NONE: | |
253 | case NFULNL_COPY_META: | |
254 | inst->copy_mode = mode; | |
255 | inst->copy_range = 0; | |
256 | break; | |
601e68e1 | 257 | |
0597f268 HW |
258 | case NFULNL_COPY_PACKET: |
259 | inst->copy_mode = mode; | |
c1e7dc91 FW |
260 | if (range == 0) |
261 | range = NFULNL_COPY_RANGE_MAX; | |
6b6ec99a MM |
262 | inst->copy_range = min_t(unsigned int, |
263 | range, NFULNL_COPY_RANGE_MAX); | |
0597f268 | 264 | break; |
601e68e1 | 265 | |
0597f268 HW |
266 | default: |
267 | status = -EINVAL; | |
268 | break; | |
269 | } | |
270 | ||
271 | spin_unlock_bh(&inst->lock); | |
272 | ||
273 | return status; | |
274 | } | |
275 | ||
276 | static int | |
277 | nfulnl_set_nlbufsiz(struct nfulnl_instance *inst, u_int32_t nlbufsiz) | |
278 | { | |
279 | int status; | |
280 | ||
281 | spin_lock_bh(&inst->lock); | |
282 | if (nlbufsiz < NFULNL_NLBUFSIZ_DEFAULT) | |
283 | status = -ERANGE; | |
284 | else if (nlbufsiz > 131072) | |
285 | status = -ERANGE; | |
286 | else { | |
287 | inst->nlbufsiz = nlbufsiz; | |
288 | status = 0; | |
289 | } | |
290 | spin_unlock_bh(&inst->lock); | |
291 | ||
292 | return status; | |
293 | } | |
294 | ||
295 | static int | |
296 | nfulnl_set_timeout(struct nfulnl_instance *inst, u_int32_t timeout) | |
297 | { | |
298 | spin_lock_bh(&inst->lock); | |
299 | inst->flushtimeout = timeout; | |
300 | spin_unlock_bh(&inst->lock); | |
301 | ||
302 | return 0; | |
303 | } | |
304 | ||
305 | static int | |
306 | nfulnl_set_qthresh(struct nfulnl_instance *inst, u_int32_t qthresh) | |
307 | { | |
308 | spin_lock_bh(&inst->lock); | |
309 | inst->qthreshold = qthresh; | |
310 | spin_unlock_bh(&inst->lock); | |
311 | ||
312 | return 0; | |
313 | } | |
314 | ||
0af5f6c1 HW |
315 | static int |
316 | nfulnl_set_flags(struct nfulnl_instance *inst, u_int16_t flags) | |
317 | { | |
318 | spin_lock_bh(&inst->lock); | |
ee433530 | 319 | inst->flags = flags; |
0af5f6c1 HW |
320 | spin_unlock_bh(&inst->lock); |
321 | ||
322 | return 0; | |
323 | } | |
324 | ||
c6a8f648 | 325 | static struct sk_buff * |
afff14f6 G |
326 | nfulnl_alloc_skb(struct net *net, u32 peer_portid, unsigned int inst_size, |
327 | unsigned int pkt_size) | |
0597f268 HW |
328 | { |
329 | struct sk_buff *skb; | |
ad2ad0f9 | 330 | unsigned int n; |
0597f268 | 331 | |
0597f268 HW |
332 | /* alloc skb which should be big enough for a whole multipart |
333 | * message. WARNING: has to be <= 128k due to slab restrictions */ | |
334 | ||
ad2ad0f9 | 335 | n = max(inst_size, pkt_size); |
afff14f6 | 336 | skb = nfnetlink_alloc_skb(net, n, peer_portid, GFP_ATOMIC); |
0597f268 | 337 | if (!skb) { |
ad2ad0f9 PM |
338 | if (n > pkt_size) { |
339 | /* try to allocate only as much as we need for current | |
340 | * packet */ | |
0597f268 | 341 | |
afff14f6 | 342 | skb = nfnetlink_alloc_skb(net, pkt_size, |
3ab1f683 | 343 | peer_portid, GFP_ATOMIC); |
ad2ad0f9 | 344 | } |
0597f268 HW |
345 | } |
346 | ||
347 | return skb; | |
348 | } | |
349 | ||
b51d3fa3 | 350 | static void |
0597f268 HW |
351 | __nfulnl_send(struct nfulnl_instance *inst) |
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); | |
b51d3fa3 HL |
358 | if (WARN_ONCE(!nlh, "bad nlskb size: %u, tailroom %d\n", |
359 | inst->skb->len, skb_tailroom(inst->skb))) { | |
360 | kfree_skb(inst->skb); | |
d550d095 | 361 | goto out; |
b51d3fa3 | 362 | } |
d550d095 | 363 | } |
b51d3fa3 HL |
364 | nfnetlink_unicast(inst->skb, inst->net, inst->peer_portid, |
365 | MSG_DONTWAIT); | |
366 | out: | |
0597f268 HW |
367 | inst->qlen = 0; |
368 | inst->skb = NULL; | |
0597f268 HW |
369 | } |
370 | ||
e3567061 MM |
371 | static void |
372 | __nfulnl_flush(struct nfulnl_instance *inst) | |
373 | { | |
374 | /* timer holds a reference */ | |
375 | if (del_timer(&inst->timer)) | |
376 | instance_put(inst); | |
377 | if (inst->skb) | |
378 | __nfulnl_send(inst); | |
379 | } | |
380 | ||
c6a8f648 MM |
381 | static void |
382 | nfulnl_timer(unsigned long data) | |
0597f268 | 383 | { |
601e68e1 | 384 | struct nfulnl_instance *inst = (struct nfulnl_instance *)data; |
0597f268 | 385 | |
0597f268 | 386 | spin_lock_bh(&inst->lock); |
370e6a87 MM |
387 | if (inst->skb) |
388 | __nfulnl_send(inst); | |
0597f268 | 389 | spin_unlock_bh(&inst->lock); |
05f7b7b3 | 390 | instance_put(inst); |
0597f268 HW |
391 | } |
392 | ||
0af5f6c1 HW |
393 | /* This is an inline function, we don't really care about a long |
394 | * list of arguments */ | |
601e68e1 | 395 | static inline int |
9368a53c G |
396 | __build_packet_message(struct nfnl_log_net *log, |
397 | struct nfulnl_instance *inst, | |
601e68e1 | 398 | const struct sk_buff *skb, |
0597f268 | 399 | unsigned int data_len, |
76108cea | 400 | u_int8_t pf, |
0597f268 HW |
401 | unsigned int hooknum, |
402 | const struct net_device *indev, | |
403 | const struct net_device *outdev, | |
d7a5c324 | 404 | const char *prefix, unsigned int plen) |
0597f268 | 405 | { |
0597f268 HW |
406 | struct nfulnl_msg_packet_hdr pmsg; |
407 | struct nlmsghdr *nlh; | |
408 | struct nfgenmsg *nfmsg; | |
27a884dc | 409 | sk_buff_data_t old_tail = inst->skb->tail; |
0626af31 | 410 | struct sock *sk; |
0c36b48b | 411 | const unsigned char *hwhdrp; |
0597f268 | 412 | |
d550d095 | 413 | nlh = nlmsg_put(inst->skb, 0, 0, |
0597f268 | 414 | NFNL_SUBSYS_ULOG << 8 | NFULNL_MSG_PACKET, |
d550d095 DM |
415 | sizeof(struct nfgenmsg), 0); |
416 | if (!nlh) | |
417 | return -1; | |
418 | nfmsg = nlmsg_data(nlh); | |
0597f268 HW |
419 | nfmsg->nfgen_family = pf; |
420 | nfmsg->version = NFNETLINK_V0; | |
421 | nfmsg->res_id = htons(inst->group_num); | |
422 | ||
e4d091d7 | 423 | memset(&pmsg, 0, sizeof(pmsg)); |
febf0a43 | 424 | pmsg.hw_protocol = skb->protocol; |
0597f268 HW |
425 | pmsg.hook = hooknum; |
426 | ||
1db20a52 DM |
427 | if (nla_put(inst->skb, NFULA_PACKET_HDR, sizeof(pmsg), &pmsg)) |
428 | goto nla_put_failure; | |
0597f268 | 429 | |
1db20a52 DM |
430 | if (prefix && |
431 | nla_put(inst->skb, NFULA_PREFIX, plen, prefix)) | |
432 | goto nla_put_failure; | |
0597f268 HW |
433 | |
434 | if (indev) { | |
1109a90c | 435 | #if !IS_ENABLED(CONFIG_BRIDGE_NETFILTER) |
1db20a52 DM |
436 | if (nla_put_be32(inst->skb, NFULA_IFINDEX_INDEV, |
437 | htonl(indev->ifindex))) | |
438 | goto nla_put_failure; | |
fbcd923c HW |
439 | #else |
440 | if (pf == PF_BRIDGE) { | |
441 | /* Case 1: outdev is physical input device, we need to | |
442 | * look for bridge group (when called from | |
443 | * netfilter_bridge) */ | |
1db20a52 DM |
444 | if (nla_put_be32(inst->skb, NFULA_IFINDEX_PHYSINDEV, |
445 | htonl(indev->ifindex)) || | |
fbcd923c | 446 | /* this is the bridge group "brX" */ |
f350a0a8 | 447 | /* rcu_read_lock()ed by nf_hook_slow or nf_log_packet */ |
1db20a52 DM |
448 | nla_put_be32(inst->skb, NFULA_IFINDEX_INDEV, |
449 | htonl(br_port_get_rcu(indev)->br->dev->ifindex))) | |
450 | goto nla_put_failure; | |
fbcd923c | 451 | } else { |
c737b7c4 FW |
452 | struct net_device *physindev; |
453 | ||
fbcd923c HW |
454 | /* Case 2: indev is bridge group, we need to look for |
455 | * physical device (when called from ipv4) */ | |
1db20a52 DM |
456 | if (nla_put_be32(inst->skb, NFULA_IFINDEX_INDEV, |
457 | htonl(indev->ifindex))) | |
458 | goto nla_put_failure; | |
c737b7c4 FW |
459 | |
460 | physindev = nf_bridge_get_physindev(skb); | |
461 | if (physindev && | |
1db20a52 | 462 | nla_put_be32(inst->skb, NFULA_IFINDEX_PHYSINDEV, |
c737b7c4 | 463 | htonl(physindev->ifindex))) |
1db20a52 | 464 | goto nla_put_failure; |
fbcd923c HW |
465 | } |
466 | #endif | |
0597f268 HW |
467 | } |
468 | ||
469 | if (outdev) { | |
1109a90c | 470 | #if !IS_ENABLED(CONFIG_BRIDGE_NETFILTER) |
1db20a52 DM |
471 | if (nla_put_be32(inst->skb, NFULA_IFINDEX_OUTDEV, |
472 | htonl(outdev->ifindex))) | |
473 | goto nla_put_failure; | |
fbcd923c HW |
474 | #else |
475 | if (pf == PF_BRIDGE) { | |
476 | /* Case 1: outdev is physical output device, we need to | |
477 | * look for bridge group (when called from | |
478 | * netfilter_bridge) */ | |
1db20a52 DM |
479 | if (nla_put_be32(inst->skb, NFULA_IFINDEX_PHYSOUTDEV, |
480 | htonl(outdev->ifindex)) || | |
fbcd923c | 481 | /* this is the bridge group "brX" */ |
f350a0a8 | 482 | /* rcu_read_lock()ed by nf_hook_slow or nf_log_packet */ |
1db20a52 DM |
483 | nla_put_be32(inst->skb, NFULA_IFINDEX_OUTDEV, |
484 | htonl(br_port_get_rcu(outdev)->br->dev->ifindex))) | |
485 | goto nla_put_failure; | |
fbcd923c | 486 | } else { |
c737b7c4 FW |
487 | struct net_device *physoutdev; |
488 | ||
fbcd923c HW |
489 | /* Case 2: indev is a bridge group, we need to look |
490 | * for physical device (when called from ipv4) */ | |
1db20a52 DM |
491 | if (nla_put_be32(inst->skb, NFULA_IFINDEX_OUTDEV, |
492 | htonl(outdev->ifindex))) | |
493 | goto nla_put_failure; | |
c737b7c4 FW |
494 | |
495 | physoutdev = nf_bridge_get_physoutdev(skb); | |
496 | if (physoutdev && | |
1db20a52 | 497 | nla_put_be32(inst->skb, NFULA_IFINDEX_PHYSOUTDEV, |
c737b7c4 | 498 | htonl(physoutdev->ifindex))) |
1db20a52 | 499 | goto nla_put_failure; |
fbcd923c HW |
500 | } |
501 | #endif | |
0597f268 HW |
502 | } |
503 | ||
1db20a52 DM |
504 | if (skb->mark && |
505 | nla_put_be32(inst->skb, NFULA_MARK, htonl(skb->mark))) | |
506 | goto nla_put_failure; | |
0597f268 | 507 | |
2c38de4c NC |
508 | if (indev && skb->dev && |
509 | skb->mac_header != skb->network_header) { | |
0597f268 | 510 | struct nfulnl_msg_packet_hw phw; |
e4d091d7 DC |
511 | int len; |
512 | ||
513 | memset(&phw, 0, sizeof(phw)); | |
514 | len = dev_parse_header(skb, phw.hw_addr); | |
b95cce35 SH |
515 | if (len > 0) { |
516 | phw.hw_addrlen = htons(len); | |
1db20a52 DM |
517 | if (nla_put(inst->skb, NFULA_HWADDR, sizeof(phw), &phw)) |
518 | goto nla_put_failure; | |
b95cce35 | 519 | } |
0597f268 HW |
520 | } |
521 | ||
72961ecf | 522 | if (indev && skb_mac_header_was_set(skb)) { |
2dba62c3 | 523 | if (nla_put_be16(inst->skb, NFULA_HWTYPE, htons(skb->dev->type)) || |
1db20a52 | 524 | nla_put_be16(inst->skb, NFULA_HWLEN, |
0c36b48b BH |
525 | htons(skb->dev->hard_header_len))) |
526 | goto nla_put_failure; | |
527 | ||
528 | hwhdrp = skb_mac_header(skb); | |
529 | ||
530 | if (skb->dev->type == ARPHRD_SIT) | |
531 | hwhdrp -= ETH_HLEN; | |
532 | ||
533 | if (hwhdrp >= skb->head && | |
534 | nla_put(inst->skb, NFULA_HWHEADER, | |
535 | skb->dev->hard_header_len, hwhdrp)) | |
1db20a52 | 536 | goto nla_put_failure; |
72961ecf EL |
537 | } |
538 | ||
b7aa0bf7 | 539 | if (skb->tstamp.tv64) { |
0597f268 | 540 | struct nfulnl_msg_packet_timestamp ts; |
b7aa0bf7 ED |
541 | struct timeval tv = ktime_to_timeval(skb->tstamp); |
542 | ts.sec = cpu_to_be64(tv.tv_sec); | |
543 | ts.usec = cpu_to_be64(tv.tv_usec); | |
0597f268 | 544 | |
1db20a52 DM |
545 | if (nla_put(inst->skb, NFULA_TIMESTAMP, sizeof(ts), &ts)) |
546 | goto nla_put_failure; | |
0597f268 HW |
547 | } |
548 | ||
549 | /* UID */ | |
0626af31 | 550 | sk = skb->sk; |
a8399231 | 551 | if (sk && sk_fullsock(sk)) { |
0626af31 ED |
552 | read_lock_bh(&sk->sk_callback_lock); |
553 | if (sk->sk_socket && sk->sk_socket->file) { | |
554 | struct file *file = sk->sk_socket->file; | |
437589a7 LT |
555 | const struct cred *cred = file->f_cred; |
556 | struct user_namespace *user_ns = inst->peer_user_ns; | |
557 | __be32 uid = htonl(from_kuid_munged(user_ns, cred->fsuid)); | |
558 | __be32 gid = htonl(from_kgid_munged(user_ns, cred->fsgid)); | |
0626af31 | 559 | read_unlock_bh(&sk->sk_callback_lock); |
1db20a52 DM |
560 | if (nla_put_be32(inst->skb, NFULA_UID, uid) || |
561 | nla_put_be32(inst->skb, NFULA_GID, gid)) | |
562 | goto nla_put_failure; | |
0597f268 | 563 | } else |
0626af31 | 564 | read_unlock_bh(&sk->sk_callback_lock); |
0597f268 HW |
565 | } |
566 | ||
0af5f6c1 | 567 | /* local sequence number */ |
1db20a52 DM |
568 | if ((inst->flags & NFULNL_CFG_F_SEQ) && |
569 | nla_put_be32(inst->skb, NFULA_SEQ, htonl(inst->seq++))) | |
570 | goto nla_put_failure; | |
0dfedd28 | 571 | |
0af5f6c1 | 572 | /* global sequence number */ |
1db20a52 DM |
573 | if ((inst->flags & NFULNL_CFG_F_SEQ_GLOBAL) && |
574 | nla_put_be32(inst->skb, NFULA_SEQ_GLOBAL, | |
9368a53c | 575 | htonl(atomic_inc_return(&log->global_seq)))) |
1db20a52 | 576 | goto nla_put_failure; |
0af5f6c1 | 577 | |
0597f268 | 578 | if (data_len) { |
df6fb868 PM |
579 | struct nlattr *nla; |
580 | int size = nla_attr_size(data_len); | |
0597f268 | 581 | |
82251615 PNA |
582 | if (skb_tailroom(inst->skb) < nla_total_size(data_len)) |
583 | goto nla_put_failure; | |
0597f268 | 584 | |
df6fb868 PM |
585 | nla = (struct nlattr *)skb_put(inst->skb, nla_total_size(data_len)); |
586 | nla->nla_type = NFULA_PAYLOAD; | |
587 | nla->nla_len = size; | |
0597f268 | 588 | |
df6fb868 | 589 | if (skb_copy_bits(skb, 0, nla_data(nla), data_len)) |
0597f268 HW |
590 | BUG(); |
591 | } | |
601e68e1 | 592 | |
0597f268 HW |
593 | nlh->nlmsg_len = inst->skb->tail - old_tail; |
594 | return 0; | |
595 | ||
df6fb868 | 596 | nla_put_failure: |
0597f268 HW |
597 | PRINTR(KERN_ERR "nfnetlink_log: error creating log nlmsg\n"); |
598 | return -1; | |
599 | } | |
600 | ||
601 | #define RCV_SKB_FAIL(err) do { netlink_ack(skb, nlh, (err)); return; } while (0) | |
602 | ||
603 | static struct nf_loginfo default_loginfo = { | |
604 | .type = NF_LOG_TYPE_ULOG, | |
605 | .u = { | |
606 | .ulog = { | |
607 | .copy_len = 0xffff, | |
608 | .group = 0, | |
609 | .qthreshold = 1, | |
610 | }, | |
611 | }, | |
612 | }; | |
613 | ||
614 | /* log handler for internal netfilter logging api */ | |
5f7340ef | 615 | void |
8cdb46da HS |
616 | nfulnl_log_packet(struct net *net, |
617 | u_int8_t pf, | |
0597f268 HW |
618 | unsigned int hooknum, |
619 | const struct sk_buff *skb, | |
620 | const struct net_device *in, | |
621 | const struct net_device *out, | |
622 | const struct nf_loginfo *li_user, | |
623 | const char *prefix) | |
624 | { | |
625 | unsigned int size, data_len; | |
626 | struct nfulnl_instance *inst; | |
627 | const struct nf_loginfo *li; | |
628 | unsigned int qthreshold; | |
d7a5c324 | 629 | unsigned int plen; |
9368a53c | 630 | struct nfnl_log_net *log = nfnl_log_pernet(net); |
0597f268 | 631 | |
601e68e1 | 632 | if (li_user && li_user->type == NF_LOG_TYPE_ULOG) |
0597f268 HW |
633 | li = li_user; |
634 | else | |
635 | li = &default_loginfo; | |
636 | ||
9368a53c | 637 | inst = instance_lookup_get(log, li->u.ulog.group); |
0597f268 | 638 | if (!inst) |
0597f268 | 639 | return; |
0597f268 | 640 | |
d7a5c324 PM |
641 | plen = 0; |
642 | if (prefix) | |
881dbfe8 | 643 | plen = strlen(prefix) + 1; |
d7a5c324 | 644 | |
0597f268 HW |
645 | /* FIXME: do we want to make the size calculation conditional based on |
646 | * what is actually present? way more branches and checks, but more | |
647 | * memory efficient... */ | |
573ce260 | 648 | size = nlmsg_total_size(sizeof(struct nfgenmsg)) |
df6fb868 PM |
649 | + nla_total_size(sizeof(struct nfulnl_msg_packet_hdr)) |
650 | + nla_total_size(sizeof(u_int32_t)) /* ifindex */ | |
651 | + nla_total_size(sizeof(u_int32_t)) /* ifindex */ | |
1109a90c | 652 | #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER) |
df6fb868 PM |
653 | + nla_total_size(sizeof(u_int32_t)) /* ifindex */ |
654 | + nla_total_size(sizeof(u_int32_t)) /* ifindex */ | |
fbcd923c | 655 | #endif |
df6fb868 PM |
656 | + nla_total_size(sizeof(u_int32_t)) /* mark */ |
657 | + nla_total_size(sizeof(u_int32_t)) /* uid */ | |
76aa1ce1 | 658 | + nla_total_size(sizeof(u_int32_t)) /* gid */ |
df6fb868 PM |
659 | + nla_total_size(plen) /* prefix */ |
660 | + nla_total_size(sizeof(struct nfulnl_msg_packet_hw)) | |
9dfa1dfe FW |
661 | + nla_total_size(sizeof(struct nfulnl_msg_packet_timestamp)) |
662 | + nla_total_size(sizeof(struct nfgenmsg)); /* NLMSG_DONE */ | |
0597f268 | 663 | |
eeff9bee PNA |
664 | if (in && skb_mac_header_was_set(skb)) { |
665 | size += nla_total_size(skb->dev->hard_header_len) | |
666 | + nla_total_size(sizeof(u_int16_t)) /* hwtype */ | |
667 | + nla_total_size(sizeof(u_int16_t)); /* hwlen */ | |
668 | } | |
669 | ||
0597f268 HW |
670 | spin_lock_bh(&inst->lock); |
671 | ||
0af5f6c1 | 672 | if (inst->flags & NFULNL_CFG_F_SEQ) |
df6fb868 | 673 | size += nla_total_size(sizeof(u_int32_t)); |
0af5f6c1 | 674 | if (inst->flags & NFULNL_CFG_F_SEQ_GLOBAL) |
df6fb868 | 675 | size += nla_total_size(sizeof(u_int32_t)); |
0af5f6c1 | 676 | |
0597f268 HW |
677 | qthreshold = inst->qthreshold; |
678 | /* per-rule qthreshold overrides per-instance */ | |
5ca431f9 EL |
679 | if (li->u.ulog.qthreshold) |
680 | if (qthreshold > li->u.ulog.qthreshold) | |
681 | qthreshold = li->u.ulog.qthreshold; | |
682 | ||
601e68e1 | 683 | |
0597f268 HW |
684 | switch (inst->copy_mode) { |
685 | case NFULNL_COPY_META: | |
686 | case NFULNL_COPY_NONE: | |
687 | data_len = 0; | |
688 | break; | |
601e68e1 | 689 | |
0597f268 | 690 | case NFULNL_COPY_PACKET: |
c1e7dc91 | 691 | if (inst->copy_range > skb->len) |
0597f268 HW |
692 | data_len = skb->len; |
693 | else | |
694 | data_len = inst->copy_range; | |
601e68e1 | 695 | |
df6fb868 | 696 | size += nla_total_size(data_len); |
0597f268 | 697 | break; |
601e68e1 | 698 | |
f5c5440d | 699 | case NFULNL_COPY_DISABLED: |
0597f268 | 700 | default: |
55b5a91e | 701 | goto unlock_and_release; |
0597f268 HW |
702 | } |
703 | ||
9dfa1dfe | 704 | if (inst->skb && size > skb_tailroom(inst->skb)) { |
0597f268 HW |
705 | /* either the queue len is too high or we don't have |
706 | * enough room in the skb left. flush to userspace. */ | |
e3567061 | 707 | __nfulnl_flush(inst); |
55b5a91e | 708 | } |
0597f268 | 709 | |
55b5a91e | 710 | if (!inst->skb) { |
afff14f6 G |
711 | inst->skb = nfulnl_alloc_skb(net, inst->peer_portid, |
712 | inst->nlbufsiz, size); | |
55b5a91e | 713 | if (!inst->skb) |
0597f268 | 714 | goto alloc_failure; |
0597f268 HW |
715 | } |
716 | ||
0597f268 HW |
717 | inst->qlen++; |
718 | ||
9368a53c | 719 | __build_packet_message(log, inst, skb, data_len, pf, |
8248779b | 720 | hooknum, in, out, prefix, plen); |
0597f268 | 721 | |
d63b043d MM |
722 | if (inst->qlen >= qthreshold) |
723 | __nfulnl_flush(inst); | |
0597f268 HW |
724 | /* timer_pending always called within inst->lock, so there |
725 | * is no chance of a race here */ | |
d63b043d | 726 | else if (!timer_pending(&inst->timer)) { |
0597f268 HW |
727 | instance_get(inst); |
728 | inst->timer.expires = jiffies + (inst->flushtimeout*HZ/100); | |
729 | add_timer(&inst->timer); | |
730 | } | |
0597f268 | 731 | |
ed32abea MM |
732 | unlock_and_release: |
733 | spin_unlock_bh(&inst->lock); | |
734 | instance_put(inst); | |
0597f268 HW |
735 | return; |
736 | ||
737 | alloc_failure: | |
0597f268 | 738 | /* FIXME: statistics */ |
ed32abea | 739 | goto unlock_and_release; |
0597f268 | 740 | } |
5f7340ef | 741 | EXPORT_SYMBOL_GPL(nfulnl_log_packet); |
0597f268 HW |
742 | |
743 | static int | |
744 | nfulnl_rcv_nl_event(struct notifier_block *this, | |
745 | unsigned long event, void *ptr) | |
746 | { | |
747 | struct netlink_notify *n = ptr; | |
9368a53c | 748 | struct nfnl_log_net *log = nfnl_log_pernet(n->net); |
0597f268 | 749 | |
dee5817e | 750 | if (event == NETLINK_URELEASE && n->protocol == NETLINK_NETFILTER) { |
0597f268 HW |
751 | int i; |
752 | ||
15e47304 | 753 | /* destroy all instances for this portid */ |
9368a53c | 754 | spin_lock_bh(&log->instances_lock); |
0597f268 | 755 | for (i = 0; i < INSTANCE_BUCKETS; i++) { |
b67bfe0d | 756 | struct hlist_node *t2; |
0597f268 | 757 | struct nfulnl_instance *inst; |
9368a53c | 758 | struct hlist_head *head = &log->instance_table[i]; |
0597f268 | 759 | |
b67bfe0d | 760 | hlist_for_each_entry_safe(inst, t2, head, hlist) { |
9368a53c | 761 | if (n->portid == inst->peer_portid) |
0597f268 HW |
762 | __instance_destroy(inst); |
763 | } | |
764 | } | |
9368a53c | 765 | spin_unlock_bh(&log->instances_lock); |
0597f268 HW |
766 | } |
767 | return NOTIFY_DONE; | |
768 | } | |
769 | ||
770 | static struct notifier_block nfulnl_rtnl_notifier = { | |
771 | .notifier_call = nfulnl_rcv_nl_event, | |
772 | }; | |
773 | ||
774 | static int | |
775 | nfulnl_recv_unsupp(struct sock *ctnl, struct sk_buff *skb, | |
39938324 PM |
776 | const struct nlmsghdr *nlh, |
777 | const struct nlattr * const nfqa[]) | |
0597f268 HW |
778 | { |
779 | return -ENOTSUPP; | |
780 | } | |
781 | ||
ca735b3a | 782 | static struct nf_logger nfulnl_logger __read_mostly = { |
0597f268 | 783 | .name = "nfnetlink_log", |
5962815a | 784 | .type = NF_LOG_TYPE_ULOG, |
0597f268 HW |
785 | .logfn = &nfulnl_log_packet, |
786 | .me = THIS_MODULE, | |
787 | }; | |
788 | ||
fd8281ad PM |
789 | static const struct nla_policy nfula_cfg_policy[NFULA_CFG_MAX+1] = { |
790 | [NFULA_CFG_CMD] = { .len = sizeof(struct nfulnl_msg_config_cmd) }, | |
791 | [NFULA_CFG_MODE] = { .len = sizeof(struct nfulnl_msg_config_mode) }, | |
792 | [NFULA_CFG_TIMEOUT] = { .type = NLA_U32 }, | |
793 | [NFULA_CFG_QTHRESH] = { .type = NLA_U32 }, | |
794 | [NFULA_CFG_NLBUFSIZ] = { .type = NLA_U32 }, | |
795 | [NFULA_CFG_FLAGS] = { .type = NLA_U16 }, | |
0597f268 HW |
796 | }; |
797 | ||
798 | static int | |
799 | nfulnl_recv_config(struct sock *ctnl, struct sk_buff *skb, | |
39938324 PM |
800 | const struct nlmsghdr *nlh, |
801 | const struct nlattr * const nfula[]) | |
0597f268 | 802 | { |
d550d095 | 803 | struct nfgenmsg *nfmsg = nlmsg_data(nlh); |
0597f268 HW |
804 | u_int16_t group_num = ntohs(nfmsg->res_id); |
805 | struct nfulnl_instance *inst; | |
b7047a1c | 806 | struct nfulnl_msg_config_cmd *cmd = NULL; |
30e0c6a6 | 807 | struct net *net = sock_net(ctnl); |
9368a53c | 808 | struct nfnl_log_net *log = nfnl_log_pernet(net); |
0597f268 HW |
809 | int ret = 0; |
810 | ||
b7047a1c PM |
811 | if (nfula[NFULA_CFG_CMD]) { |
812 | u_int8_t pf = nfmsg->nfgen_family; | |
813 | cmd = nla_data(nfula[NFULA_CFG_CMD]); | |
814 | ||
815 | /* Commands without queue context */ | |
816 | switch (cmd->command) { | |
817 | case NFULNL_CFG_CMD_PF_BIND: | |
30e0c6a6 | 818 | return nf_log_bind_pf(net, pf, &nfulnl_logger); |
b7047a1c | 819 | case NFULNL_CFG_CMD_PF_UNBIND: |
30e0c6a6 | 820 | nf_log_unbind_pf(net, pf); |
b7047a1c PM |
821 | return 0; |
822 | } | |
823 | } | |
824 | ||
9368a53c | 825 | inst = instance_lookup_get(log, group_num); |
15e47304 | 826 | if (inst && inst->peer_portid != NETLINK_CB(skb).portid) { |
c0506365 PM |
827 | ret = -EPERM; |
828 | goto out_put; | |
829 | } | |
830 | ||
b7047a1c | 831 | if (cmd != NULL) { |
0597f268 HW |
832 | switch (cmd->command) { |
833 | case NFULNL_CFG_CMD_BIND: | |
834 | if (inst) { | |
835 | ret = -EBUSY; | |
836 | goto out_put; | |
837 | } | |
838 | ||
9368a53c | 839 | inst = instance_create(net, group_num, |
15e47304 | 840 | NETLINK_CB(skb).portid, |
e32123e5 | 841 | sk_user_ns(NETLINK_CB(skb).sk)); |
baab2ce7 PM |
842 | if (IS_ERR(inst)) { |
843 | ret = PTR_ERR(inst); | |
f414c16c | 844 | goto out; |
0597f268 HW |
845 | } |
846 | break; | |
847 | case NFULNL_CFG_CMD_UNBIND: | |
848 | if (!inst) { | |
849 | ret = -ENODEV; | |
f414c16c | 850 | goto out; |
0597f268 HW |
851 | } |
852 | ||
9368a53c | 853 | instance_destroy(log, inst); |
a49c6503 | 854 | goto out_put; |
0597f268 | 855 | default: |
cd21f0ac | 856 | ret = -ENOTSUPP; |
0597f268 HW |
857 | break; |
858 | } | |
0597f268 HW |
859 | } |
860 | ||
df6fb868 | 861 | if (nfula[NFULA_CFG_MODE]) { |
0597f268 | 862 | struct nfulnl_msg_config_mode *params; |
df6fb868 | 863 | params = nla_data(nfula[NFULA_CFG_MODE]); |
0597f268 | 864 | |
c0506365 PM |
865 | if (!inst) { |
866 | ret = -ENODEV; | |
867 | goto out; | |
868 | } | |
0597f268 | 869 | nfulnl_set_mode(inst, params->copy_mode, |
d1208b99 | 870 | ntohl(params->copy_range)); |
0597f268 HW |
871 | } |
872 | ||
df6fb868 | 873 | if (nfula[NFULA_CFG_TIMEOUT]) { |
0dfedd28 | 874 | __be32 timeout = nla_get_be32(nfula[NFULA_CFG_TIMEOUT]); |
0597f268 | 875 | |
c0506365 PM |
876 | if (!inst) { |
877 | ret = -ENODEV; | |
878 | goto out; | |
879 | } | |
0597f268 HW |
880 | nfulnl_set_timeout(inst, ntohl(timeout)); |
881 | } | |
882 | ||
df6fb868 | 883 | if (nfula[NFULA_CFG_NLBUFSIZ]) { |
0dfedd28 | 884 | __be32 nlbufsiz = nla_get_be32(nfula[NFULA_CFG_NLBUFSIZ]); |
0597f268 | 885 | |
c0506365 PM |
886 | if (!inst) { |
887 | ret = -ENODEV; | |
888 | goto out; | |
889 | } | |
0597f268 HW |
890 | nfulnl_set_nlbufsiz(inst, ntohl(nlbufsiz)); |
891 | } | |
892 | ||
df6fb868 | 893 | if (nfula[NFULA_CFG_QTHRESH]) { |
0dfedd28 | 894 | __be32 qthresh = nla_get_be32(nfula[NFULA_CFG_QTHRESH]); |
0597f268 | 895 | |
c0506365 PM |
896 | if (!inst) { |
897 | ret = -ENODEV; | |
898 | goto out; | |
899 | } | |
0597f268 HW |
900 | nfulnl_set_qthresh(inst, ntohl(qthresh)); |
901 | } | |
902 | ||
df6fb868 | 903 | if (nfula[NFULA_CFG_FLAGS]) { |
0dfedd28 | 904 | __be16 flags = nla_get_be16(nfula[NFULA_CFG_FLAGS]); |
c0506365 PM |
905 | |
906 | if (!inst) { | |
907 | ret = -ENODEV; | |
908 | goto out; | |
909 | } | |
ee433530 | 910 | nfulnl_set_flags(inst, ntohs(flags)); |
0af5f6c1 HW |
911 | } |
912 | ||
0597f268 HW |
913 | out_put: |
914 | instance_put(inst); | |
dd16704e | 915 | out: |
0597f268 HW |
916 | return ret; |
917 | } | |
918 | ||
7c8d4cb4 | 919 | static const struct nfnl_callback nfulnl_cb[NFULNL_MSG_MAX] = { |
0597f268 | 920 | [NFULNL_MSG_PACKET] = { .call = nfulnl_recv_unsupp, |
37d2e7a2 | 921 | .attr_count = NFULA_MAX, }, |
0597f268 | 922 | [NFULNL_MSG_CONFIG] = { .call = nfulnl_recv_config, |
fd8281ad PM |
923 | .attr_count = NFULA_CFG_MAX, |
924 | .policy = nfula_cfg_policy }, | |
0597f268 HW |
925 | }; |
926 | ||
7c8d4cb4 | 927 | static const struct nfnetlink_subsystem nfulnl_subsys = { |
0597f268 HW |
928 | .name = "log", |
929 | .subsys_id = NFNL_SUBSYS_ULOG, | |
930 | .cb_count = NFULNL_MSG_MAX, | |
0597f268 HW |
931 | .cb = nfulnl_cb, |
932 | }; | |
933 | ||
934 | #ifdef CONFIG_PROC_FS | |
935 | struct iter_state { | |
9368a53c | 936 | struct seq_net_private p; |
0597f268 HW |
937 | unsigned int bucket; |
938 | }; | |
939 | ||
9368a53c | 940 | static struct hlist_node *get_first(struct net *net, struct iter_state *st) |
0597f268 | 941 | { |
9368a53c | 942 | struct nfnl_log_net *log; |
0597f268 HW |
943 | if (!st) |
944 | return NULL; | |
945 | ||
9368a53c G |
946 | log = nfnl_log_pernet(net); |
947 | ||
0597f268 | 948 | for (st->bucket = 0; st->bucket < INSTANCE_BUCKETS; st->bucket++) { |
9368a53c G |
949 | struct hlist_head *head = &log->instance_table[st->bucket]; |
950 | ||
951 | if (!hlist_empty(head)) | |
952 | return rcu_dereference_bh(hlist_first_rcu(head)); | |
0597f268 HW |
953 | } |
954 | return NULL; | |
955 | } | |
956 | ||
9368a53c G |
957 | static struct hlist_node *get_next(struct net *net, struct iter_state *st, |
958 | struct hlist_node *h) | |
0597f268 | 959 | { |
0e60ebe0 | 960 | h = rcu_dereference_bh(hlist_next_rcu(h)); |
0597f268 | 961 | while (!h) { |
9368a53c G |
962 | struct nfnl_log_net *log; |
963 | struct hlist_head *head; | |
964 | ||
0597f268 HW |
965 | if (++st->bucket >= INSTANCE_BUCKETS) |
966 | return NULL; | |
967 | ||
9368a53c G |
968 | log = nfnl_log_pernet(net); |
969 | head = &log->instance_table[st->bucket]; | |
970 | h = rcu_dereference_bh(hlist_first_rcu(head)); | |
0597f268 HW |
971 | } |
972 | return h; | |
973 | } | |
974 | ||
9368a53c G |
975 | static struct hlist_node *get_idx(struct net *net, struct iter_state *st, |
976 | loff_t pos) | |
0597f268 HW |
977 | { |
978 | struct hlist_node *head; | |
9368a53c | 979 | head = get_first(net, st); |
0597f268 HW |
980 | |
981 | if (head) | |
9368a53c | 982 | while (pos && (head = get_next(net, st, head))) |
0597f268 HW |
983 | pos--; |
984 | return pos ? NULL : head; | |
985 | } | |
986 | ||
9368a53c | 987 | static void *seq_start(struct seq_file *s, loff_t *pos) |
bed1be20 | 988 | __acquires(rcu_bh) |
0597f268 | 989 | { |
bed1be20 | 990 | rcu_read_lock_bh(); |
9368a53c | 991 | return get_idx(seq_file_net(s), s->private, *pos); |
0597f268 HW |
992 | } |
993 | ||
994 | static void *seq_next(struct seq_file *s, void *v, loff_t *pos) | |
995 | { | |
996 | (*pos)++; | |
9368a53c | 997 | return get_next(seq_file_net(s), s->private, v); |
0597f268 HW |
998 | } |
999 | ||
1000 | static void seq_stop(struct seq_file *s, void *v) | |
bed1be20 | 1001 | __releases(rcu_bh) |
0597f268 | 1002 | { |
bed1be20 | 1003 | rcu_read_unlock_bh(); |
0597f268 HW |
1004 | } |
1005 | ||
1006 | static int seq_show(struct seq_file *s, void *v) | |
1007 | { | |
1008 | const struct nfulnl_instance *inst = v; | |
1009 | ||
20a1d165 | 1010 | seq_printf(s, "%5u %6u %5u %1u %5u %6u %2u\n", |
1ca9e417 JP |
1011 | inst->group_num, |
1012 | inst->peer_portid, inst->qlen, | |
1013 | inst->copy_mode, inst->copy_range, | |
1014 | inst->flushtimeout, atomic_read(&inst->use)); | |
1015 | ||
1016 | return 0; | |
0597f268 HW |
1017 | } |
1018 | ||
56b3d975 | 1019 | static const struct seq_operations nful_seq_ops = { |
0597f268 HW |
1020 | .start = seq_start, |
1021 | .next = seq_next, | |
1022 | .stop = seq_stop, | |
1023 | .show = seq_show, | |
1024 | }; | |
1025 | ||
1026 | static int nful_open(struct inode *inode, struct file *file) | |
1027 | { | |
9368a53c G |
1028 | return seq_open_net(inode, file, &nful_seq_ops, |
1029 | sizeof(struct iter_state)); | |
0597f268 HW |
1030 | } |
1031 | ||
da7071d7 | 1032 | static const struct file_operations nful_file_ops = { |
0597f268 HW |
1033 | .owner = THIS_MODULE, |
1034 | .open = nful_open, | |
1035 | .read = seq_read, | |
1036 | .llseek = seq_lseek, | |
9368a53c | 1037 | .release = seq_release_net, |
0597f268 HW |
1038 | }; |
1039 | ||
1040 | #endif /* PROC_FS */ | |
1041 | ||
9368a53c | 1042 | static int __net_init nfnl_log_net_init(struct net *net) |
0597f268 | 1043 | { |
9368a53c G |
1044 | unsigned int i; |
1045 | struct nfnl_log_net *log = nfnl_log_pernet(net); | |
601e68e1 | 1046 | |
0597f268 | 1047 | for (i = 0; i < INSTANCE_BUCKETS; i++) |
9368a53c G |
1048 | INIT_HLIST_HEAD(&log->instance_table[i]); |
1049 | spin_lock_init(&log->instances_lock); | |
1050 | ||
1051 | #ifdef CONFIG_PROC_FS | |
1052 | if (!proc_create("nfnetlink_log", 0440, | |
1053 | net->nf.proc_netfilter, &nful_file_ops)) | |
1054 | return -ENOMEM; | |
1055 | #endif | |
1056 | return 0; | |
1057 | } | |
1058 | ||
1059 | static void __net_exit nfnl_log_net_exit(struct net *net) | |
1060 | { | |
e778f56e | 1061 | #ifdef CONFIG_PROC_FS |
9368a53c | 1062 | remove_proc_entry("nfnetlink_log", net->nf.proc_netfilter); |
e778f56e | 1063 | #endif |
45c2aff6 | 1064 | nf_log_unset(net, &nfulnl_logger); |
9368a53c G |
1065 | } |
1066 | ||
1067 | static struct pernet_operations nfnl_log_net_ops = { | |
1068 | .init = nfnl_log_net_init, | |
1069 | .exit = nfnl_log_net_exit, | |
1070 | .id = &nfnl_log_net_id, | |
1071 | .size = sizeof(struct nfnl_log_net), | |
1072 | }; | |
1073 | ||
1074 | static int __init nfnetlink_log_init(void) | |
1075 | { | |
1076 | int status = -ENOMEM; | |
601e68e1 | 1077 | |
0597f268 HW |
1078 | netlink_register_notifier(&nfulnl_rtnl_notifier); |
1079 | status = nfnetlink_subsys_register(&nfulnl_subsys); | |
1080 | if (status < 0) { | |
beacd3e8 | 1081 | pr_err("failed to create netlink socket\n"); |
0597f268 HW |
1082 | goto cleanup_netlink_notifier; |
1083 | } | |
1084 | ||
ca735b3a EL |
1085 | status = nf_log_register(NFPROTO_UNSPEC, &nfulnl_logger); |
1086 | if (status < 0) { | |
beacd3e8 | 1087 | pr_err("failed to register logger\n"); |
ca735b3a EL |
1088 | goto cleanup_subsys; |
1089 | } | |
1090 | ||
9368a53c G |
1091 | status = register_pernet_subsys(&nfnl_log_net_ops); |
1092 | if (status < 0) { | |
beacd3e8 | 1093 | pr_err("failed to register pernet ops\n"); |
ca735b3a | 1094 | goto cleanup_logger; |
6fc09f10 | 1095 | } |
0597f268 HW |
1096 | return status; |
1097 | ||
ca735b3a EL |
1098 | cleanup_logger: |
1099 | nf_log_unregister(&nfulnl_logger); | |
0597f268 | 1100 | cleanup_subsys: |
0597f268 HW |
1101 | nfnetlink_subsys_unregister(&nfulnl_subsys); |
1102 | cleanup_netlink_notifier: | |
1103 | netlink_unregister_notifier(&nfulnl_rtnl_notifier); | |
1104 | return status; | |
1105 | } | |
1106 | ||
65b4b4e8 | 1107 | static void __exit nfnetlink_log_fini(void) |
0597f268 | 1108 | { |
9368a53c | 1109 | unregister_pernet_subsys(&nfnl_log_net_ops); |
e92ad99c | 1110 | nf_log_unregister(&nfulnl_logger); |
32292a7f PM |
1111 | nfnetlink_subsys_unregister(&nfulnl_subsys); |
1112 | netlink_unregister_notifier(&nfulnl_rtnl_notifier); | |
0597f268 HW |
1113 | } |
1114 | ||
1115 | MODULE_DESCRIPTION("netfilter userspace logging"); | |
1116 | MODULE_AUTHOR("Harald Welte <laforge@netfilter.org>"); | |
1117 | MODULE_LICENSE("GPL"); | |
f682faef | 1118 | MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_ULOG); |
fab4085f PNA |
1119 | MODULE_ALIAS_NF_LOGGER(AF_INET, 1); |
1120 | MODULE_ALIAS_NF_LOGGER(AF_INET6, 1); | |
1121 | MODULE_ALIAS_NF_LOGGER(AF_BRIDGE, 1); | |
0597f268 | 1122 | |
65b4b4e8 AM |
1123 | module_init(nfnetlink_log_init); |
1124 | module_exit(nfnetlink_log_fini); |