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> | |
573ce260 | 26 | #include <net/netlink.h> |
0597f268 HW |
27 | #include <linux/netfilter/nfnetlink.h> |
28 | #include <linux/netfilter/nfnetlink_log.h> | |
29 | #include <linux/spinlock.h> | |
30 | #include <linux/sysctl.h> | |
31 | #include <linux/proc_fs.h> | |
32 | #include <linux/security.h> | |
33 | #include <linux/list.h> | |
5a0e3ad6 | 34 | #include <linux/slab.h> |
0597f268 | 35 | #include <net/sock.h> |
f01ffbd6 | 36 | #include <net/netfilter/nf_log.h> |
9368a53c | 37 | #include <net/netns/generic.h> |
d9e15007 | 38 | #include <net/netfilter/nfnetlink_log.h> |
0597f268 | 39 | |
60063497 | 40 | #include <linux/atomic.h> |
0597f268 | 41 | |
1109a90c | 42 | #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER) |
fbcd923c HW |
43 | #include "../bridge/br_private.h" |
44 | #endif | |
45 | ||
c2db2924 | 46 | #define NFULNL_NLBUFSIZ_DEFAULT NLMSG_GOODSIZE |
2c6764b7 | 47 | #define NFULNL_TIMEOUT_DEFAULT 100 /* every second */ |
0597f268 | 48 | #define NFULNL_QTHRESH_DEFAULT 100 /* 100 packets */ |
c1e7dc91 FW |
49 | /* max packet size is limited by 16-bit struct nfattr nfa_len field */ |
50 | #define NFULNL_COPY_RANGE_MAX (0xFFFF - NLA_HDRLEN) | |
0597f268 HW |
51 | |
52 | #define PRINTR(x, args...) do { if (net_ratelimit()) \ | |
53 | printk(x, ## args); } while (0); | |
54 | ||
0597f268 HW |
55 | struct nfulnl_instance { |
56 | struct hlist_node hlist; /* global list of instances */ | |
57 | spinlock_t lock; | |
58 | atomic_t use; /* use count */ | |
59 | ||
60 | unsigned int qlen; /* number of nlmsgs in skb */ | |
61 | struct sk_buff *skb; /* pre-allocatd skb */ | |
0597f268 | 62 | struct timer_list timer; |
9368a53c | 63 | struct net *net; |
9eea9515 | 64 | struct user_namespace *peer_user_ns; /* User namespace of the peer process */ |
15e47304 | 65 | int peer_portid; /* PORTID of the peer process */ |
0597f268 HW |
66 | |
67 | /* configurable parameters */ | |
68 | unsigned int flushtimeout; /* timeout until queue flush */ | |
69 | unsigned int nlbufsiz; /* netlink buffer allocation size */ | |
70 | unsigned int qthreshold; /* threshold of the queue */ | |
71 | u_int32_t copy_range; | |
0af5f6c1 | 72 | u_int32_t seq; /* instance-local sequential counter */ |
0597f268 | 73 | u_int16_t group_num; /* number of this queue */ |
0af5f6c1 | 74 | u_int16_t flags; |
601e68e1 | 75 | u_int8_t copy_mode; |
bed1be20 | 76 | struct rcu_head rcu; |
0597f268 HW |
77 | }; |
78 | ||
0597f268 | 79 | #define INSTANCE_BUCKETS 16 |
0597f268 | 80 | |
9368a53c G |
81 | static int nfnl_log_net_id __read_mostly; |
82 | ||
83 | struct nfnl_log_net { | |
84 | spinlock_t instances_lock; | |
85 | struct hlist_head instance_table[INSTANCE_BUCKETS]; | |
86 | atomic_t global_seq; | |
87 | }; | |
88 | ||
89 | static struct nfnl_log_net *nfnl_log_pernet(struct net *net) | |
90 | { | |
91 | return net_generic(net, nfnl_log_net_id); | |
92 | } | |
93 | ||
0597f268 HW |
94 | static inline u_int8_t instance_hashfn(u_int16_t group_num) |
95 | { | |
96 | return ((group_num & 0xff) % INSTANCE_BUCKETS); | |
97 | } | |
98 | ||
99 | static struct nfulnl_instance * | |
9368a53c | 100 | __instance_lookup(struct nfnl_log_net *log, u_int16_t group_num) |
0597f268 HW |
101 | { |
102 | struct hlist_head *head; | |
0597f268 HW |
103 | struct nfulnl_instance *inst; |
104 | ||
9368a53c | 105 | head = &log->instance_table[instance_hashfn(group_num)]; |
b67bfe0d | 106 | hlist_for_each_entry_rcu(inst, head, hlist) { |
0597f268 HW |
107 | if (inst->group_num == group_num) |
108 | return inst; | |
109 | } | |
110 | return NULL; | |
111 | } | |
112 | ||
113 | static inline void | |
114 | instance_get(struct nfulnl_instance *inst) | |
115 | { | |
116 | atomic_inc(&inst->use); | |
117 | } | |
118 | ||
119 | static struct nfulnl_instance * | |
9368a53c | 120 | instance_lookup_get(struct nfnl_log_net *log, u_int16_t group_num) |
0597f268 HW |
121 | { |
122 | struct nfulnl_instance *inst; | |
123 | ||
bed1be20 | 124 | rcu_read_lock_bh(); |
9368a53c | 125 | inst = __instance_lookup(log, group_num); |
f5c5440d ED |
126 | if (inst && !atomic_inc_not_zero(&inst->use)) |
127 | inst = NULL; | |
bed1be20 | 128 | rcu_read_unlock_bh(); |
0597f268 HW |
129 | |
130 | return inst; | |
131 | } | |
132 | ||
bed1be20 ED |
133 | static void nfulnl_instance_free_rcu(struct rcu_head *head) |
134 | { | |
9368a53c G |
135 | struct nfulnl_instance *inst = |
136 | container_of(head, struct nfulnl_instance, rcu); | |
137 | ||
138 | put_net(inst->net); | |
139 | kfree(inst); | |
bed1be20 ED |
140 | module_put(THIS_MODULE); |
141 | } | |
142 | ||
0597f268 HW |
143 | static void |
144 | instance_put(struct nfulnl_instance *inst) | |
145 | { | |
bed1be20 ED |
146 | if (inst && atomic_dec_and_test(&inst->use)) |
147 | call_rcu_bh(&inst->rcu, nfulnl_instance_free_rcu); | |
0597f268 HW |
148 | } |
149 | ||
150 | static void nfulnl_timer(unsigned long data); | |
151 | ||
152 | static struct nfulnl_instance * | |
9368a53c G |
153 | instance_create(struct net *net, u_int16_t group_num, |
154 | int portid, struct user_namespace *user_ns) | |
0597f268 HW |
155 | { |
156 | struct nfulnl_instance *inst; | |
9368a53c | 157 | struct nfnl_log_net *log = nfnl_log_pernet(net); |
baab2ce7 | 158 | int err; |
0597f268 | 159 | |
9368a53c G |
160 | spin_lock_bh(&log->instances_lock); |
161 | if (__instance_lookup(log, group_num)) { | |
baab2ce7 | 162 | err = -EEXIST; |
0597f268 HW |
163 | goto out_unlock; |
164 | } | |
165 | ||
10dfdc69 | 166 | inst = kzalloc(sizeof(*inst), GFP_ATOMIC); |
baab2ce7 PM |
167 | if (!inst) { |
168 | err = -ENOMEM; | |
0597f268 | 169 | goto out_unlock; |
baab2ce7 | 170 | } |
0597f268 | 171 | |
aace57e0 MM |
172 | if (!try_module_get(THIS_MODULE)) { |
173 | kfree(inst); | |
baab2ce7 | 174 | err = -EAGAIN; |
aace57e0 MM |
175 | goto out_unlock; |
176 | } | |
177 | ||
0597f268 | 178 | INIT_HLIST_NODE(&inst->hlist); |
181a46a5 | 179 | spin_lock_init(&inst->lock); |
0597f268 HW |
180 | /* needs to be two, since we _put() after creation */ |
181 | atomic_set(&inst->use, 2); | |
182 | ||
e6f689db | 183 | setup_timer(&inst->timer, nfulnl_timer, (unsigned long)inst); |
0597f268 | 184 | |
9368a53c | 185 | inst->net = get_net(net); |
9eea9515 | 186 | inst->peer_user_ns = user_ns; |
15e47304 | 187 | inst->peer_portid = portid; |
0597f268 HW |
188 | inst->group_num = group_num; |
189 | ||
190 | inst->qthreshold = NFULNL_QTHRESH_DEFAULT; | |
191 | inst->flushtimeout = NFULNL_TIMEOUT_DEFAULT; | |
192 | inst->nlbufsiz = NFULNL_NLBUFSIZ_DEFAULT; | |
193 | inst->copy_mode = NFULNL_COPY_PACKET; | |
6b6ec99a | 194 | inst->copy_range = NFULNL_COPY_RANGE_MAX; |
0597f268 | 195 | |
f5c5440d | 196 | hlist_add_head_rcu(&inst->hlist, |
9368a53c G |
197 | &log->instance_table[instance_hashfn(group_num)]); |
198 | ||
0597f268 | 199 | |
9368a53c | 200 | spin_unlock_bh(&log->instances_lock); |
0597f268 HW |
201 | |
202 | return inst; | |
203 | ||
0597f268 | 204 | out_unlock: |
9368a53c | 205 | spin_unlock_bh(&log->instances_lock); |
baab2ce7 | 206 | return ERR_PTR(err); |
0597f268 HW |
207 | } |
208 | ||
e3567061 | 209 | static void __nfulnl_flush(struct nfulnl_instance *inst); |
0597f268 | 210 | |
f5c5440d | 211 | /* called with BH disabled */ |
0597f268 | 212 | static void |
9afdb00c | 213 | __instance_destroy(struct nfulnl_instance *inst) |
0597f268 HW |
214 | { |
215 | /* first pull it out of the global list */ | |
f5c5440d | 216 | hlist_del_rcu(&inst->hlist); |
0597f268 | 217 | |
0597f268 HW |
218 | /* then flush all pending packets from skb */ |
219 | ||
f5c5440d ED |
220 | spin_lock(&inst->lock); |
221 | ||
222 | /* lockless readers wont be able to use us */ | |
223 | inst->copy_mode = NFULNL_COPY_DISABLED; | |
224 | ||
e3567061 MM |
225 | if (inst->skb) |
226 | __nfulnl_flush(inst); | |
f5c5440d | 227 | spin_unlock(&inst->lock); |
0597f268 HW |
228 | |
229 | /* and finally put the refcount */ | |
230 | instance_put(inst); | |
0597f268 HW |
231 | } |
232 | ||
0597f268 | 233 | static inline void |
9368a53c G |
234 | instance_destroy(struct nfnl_log_net *log, |
235 | struct nfulnl_instance *inst) | |
0597f268 | 236 | { |
9368a53c | 237 | spin_lock_bh(&log->instances_lock); |
9afdb00c | 238 | __instance_destroy(inst); |
9368a53c | 239 | spin_unlock_bh(&log->instances_lock); |
0597f268 HW |
240 | } |
241 | ||
242 | static int | |
243 | nfulnl_set_mode(struct nfulnl_instance *inst, u_int8_t mode, | |
244 | unsigned int range) | |
245 | { | |
246 | int status = 0; | |
247 | ||
248 | spin_lock_bh(&inst->lock); | |
601e68e1 | 249 | |
0597f268 HW |
250 | switch (mode) { |
251 | case NFULNL_COPY_NONE: | |
252 | case NFULNL_COPY_META: | |
253 | inst->copy_mode = mode; | |
254 | inst->copy_range = 0; | |
255 | break; | |
601e68e1 | 256 | |
0597f268 HW |
257 | case NFULNL_COPY_PACKET: |
258 | inst->copy_mode = mode; | |
c1e7dc91 FW |
259 | if (range == 0) |
260 | range = NFULNL_COPY_RANGE_MAX; | |
6b6ec99a MM |
261 | inst->copy_range = min_t(unsigned int, |
262 | range, NFULNL_COPY_RANGE_MAX); | |
0597f268 | 263 | break; |
601e68e1 | 264 | |
0597f268 HW |
265 | default: |
266 | status = -EINVAL; | |
267 | break; | |
268 | } | |
269 | ||
270 | spin_unlock_bh(&inst->lock); | |
271 | ||
272 | return status; | |
273 | } | |
274 | ||
275 | static int | |
276 | nfulnl_set_nlbufsiz(struct nfulnl_instance *inst, u_int32_t nlbufsiz) | |
277 | { | |
278 | int status; | |
279 | ||
280 | spin_lock_bh(&inst->lock); | |
281 | if (nlbufsiz < NFULNL_NLBUFSIZ_DEFAULT) | |
282 | status = -ERANGE; | |
283 | else if (nlbufsiz > 131072) | |
284 | status = -ERANGE; | |
285 | else { | |
286 | inst->nlbufsiz = nlbufsiz; | |
287 | status = 0; | |
288 | } | |
289 | spin_unlock_bh(&inst->lock); | |
290 | ||
291 | return status; | |
292 | } | |
293 | ||
294 | static int | |
295 | nfulnl_set_timeout(struct nfulnl_instance *inst, u_int32_t timeout) | |
296 | { | |
297 | spin_lock_bh(&inst->lock); | |
298 | inst->flushtimeout = timeout; | |
299 | spin_unlock_bh(&inst->lock); | |
300 | ||
301 | return 0; | |
302 | } | |
303 | ||
304 | static int | |
305 | nfulnl_set_qthresh(struct nfulnl_instance *inst, u_int32_t qthresh) | |
306 | { | |
307 | spin_lock_bh(&inst->lock); | |
308 | inst->qthreshold = qthresh; | |
309 | spin_unlock_bh(&inst->lock); | |
310 | ||
311 | return 0; | |
312 | } | |
313 | ||
0af5f6c1 HW |
314 | static int |
315 | nfulnl_set_flags(struct nfulnl_instance *inst, u_int16_t flags) | |
316 | { | |
317 | spin_lock_bh(&inst->lock); | |
ee433530 | 318 | inst->flags = flags; |
0af5f6c1 HW |
319 | spin_unlock_bh(&inst->lock); |
320 | ||
321 | return 0; | |
322 | } | |
323 | ||
c6a8f648 | 324 | static struct sk_buff * |
afff14f6 G |
325 | nfulnl_alloc_skb(struct net *net, u32 peer_portid, unsigned int inst_size, |
326 | unsigned int pkt_size) | |
0597f268 HW |
327 | { |
328 | struct sk_buff *skb; | |
ad2ad0f9 | 329 | unsigned int n; |
0597f268 | 330 | |
0597f268 HW |
331 | /* alloc skb which should be big enough for a whole multipart |
332 | * message. WARNING: has to be <= 128k due to slab restrictions */ | |
333 | ||
ad2ad0f9 | 334 | n = max(inst_size, pkt_size); |
afff14f6 | 335 | skb = nfnetlink_alloc_skb(net, n, peer_portid, GFP_ATOMIC); |
0597f268 | 336 | if (!skb) { |
ad2ad0f9 PM |
337 | if (n > pkt_size) { |
338 | /* try to allocate only as much as we need for current | |
339 | * packet */ | |
0597f268 | 340 | |
afff14f6 | 341 | skb = nfnetlink_alloc_skb(net, pkt_size, |
3ab1f683 | 342 | peer_portid, GFP_ATOMIC); |
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 | |
82251615 PNA |
573 | if (skb_tailroom(inst->skb) < nla_total_size(data_len)) |
574 | goto nla_put_failure; | |
0597f268 | 575 | |
df6fb868 PM |
576 | nla = (struct nlattr *)skb_put(inst->skb, nla_total_size(data_len)); |
577 | nla->nla_type = NFULA_PAYLOAD; | |
578 | nla->nla_len = size; | |
0597f268 | 579 | |
df6fb868 | 580 | if (skb_copy_bits(skb, 0, nla_data(nla), data_len)) |
0597f268 HW |
581 | BUG(); |
582 | } | |
601e68e1 | 583 | |
0597f268 HW |
584 | nlh->nlmsg_len = inst->skb->tail - old_tail; |
585 | return 0; | |
586 | ||
df6fb868 | 587 | nla_put_failure: |
0597f268 HW |
588 | PRINTR(KERN_ERR "nfnetlink_log: error creating log nlmsg\n"); |
589 | return -1; | |
590 | } | |
591 | ||
592 | #define RCV_SKB_FAIL(err) do { netlink_ack(skb, nlh, (err)); return; } while (0) | |
593 | ||
594 | static struct nf_loginfo default_loginfo = { | |
595 | .type = NF_LOG_TYPE_ULOG, | |
596 | .u = { | |
597 | .ulog = { | |
598 | .copy_len = 0xffff, | |
599 | .group = 0, | |
600 | .qthreshold = 1, | |
601 | }, | |
602 | }, | |
603 | }; | |
604 | ||
605 | /* log handler for internal netfilter logging api */ | |
5f7340ef | 606 | void |
8cdb46da HS |
607 | nfulnl_log_packet(struct net *net, |
608 | u_int8_t pf, | |
0597f268 HW |
609 | unsigned int hooknum, |
610 | const struct sk_buff *skb, | |
611 | const struct net_device *in, | |
612 | const struct net_device *out, | |
613 | const struct nf_loginfo *li_user, | |
614 | const char *prefix) | |
615 | { | |
616 | unsigned int size, data_len; | |
617 | struct nfulnl_instance *inst; | |
618 | const struct nf_loginfo *li; | |
619 | unsigned int qthreshold; | |
d7a5c324 | 620 | unsigned int plen; |
9368a53c | 621 | struct nfnl_log_net *log = nfnl_log_pernet(net); |
0597f268 | 622 | |
601e68e1 | 623 | if (li_user && li_user->type == NF_LOG_TYPE_ULOG) |
0597f268 HW |
624 | li = li_user; |
625 | else | |
626 | li = &default_loginfo; | |
627 | ||
9368a53c | 628 | inst = instance_lookup_get(log, li->u.ulog.group); |
0597f268 | 629 | if (!inst) |
0597f268 | 630 | return; |
0597f268 | 631 | |
d7a5c324 PM |
632 | plen = 0; |
633 | if (prefix) | |
881dbfe8 | 634 | plen = strlen(prefix) + 1; |
d7a5c324 | 635 | |
0597f268 HW |
636 | /* FIXME: do we want to make the size calculation conditional based on |
637 | * what is actually present? way more branches and checks, but more | |
638 | * memory efficient... */ | |
573ce260 | 639 | size = nlmsg_total_size(sizeof(struct nfgenmsg)) |
df6fb868 PM |
640 | + nla_total_size(sizeof(struct nfulnl_msg_packet_hdr)) |
641 | + nla_total_size(sizeof(u_int32_t)) /* ifindex */ | |
642 | + nla_total_size(sizeof(u_int32_t)) /* ifindex */ | |
1109a90c | 643 | #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER) |
df6fb868 PM |
644 | + nla_total_size(sizeof(u_int32_t)) /* ifindex */ |
645 | + nla_total_size(sizeof(u_int32_t)) /* ifindex */ | |
fbcd923c | 646 | #endif |
df6fb868 PM |
647 | + nla_total_size(sizeof(u_int32_t)) /* mark */ |
648 | + nla_total_size(sizeof(u_int32_t)) /* uid */ | |
76aa1ce1 | 649 | + nla_total_size(sizeof(u_int32_t)) /* gid */ |
df6fb868 PM |
650 | + nla_total_size(plen) /* prefix */ |
651 | + nla_total_size(sizeof(struct nfulnl_msg_packet_hw)) | |
9dfa1dfe FW |
652 | + nla_total_size(sizeof(struct nfulnl_msg_packet_timestamp)) |
653 | + nla_total_size(sizeof(struct nfgenmsg)); /* NLMSG_DONE */ | |
0597f268 | 654 | |
eeff9bee PNA |
655 | if (in && skb_mac_header_was_set(skb)) { |
656 | size += nla_total_size(skb->dev->hard_header_len) | |
657 | + nla_total_size(sizeof(u_int16_t)) /* hwtype */ | |
658 | + nla_total_size(sizeof(u_int16_t)); /* hwlen */ | |
659 | } | |
660 | ||
0597f268 HW |
661 | spin_lock_bh(&inst->lock); |
662 | ||
0af5f6c1 | 663 | if (inst->flags & NFULNL_CFG_F_SEQ) |
df6fb868 | 664 | size += nla_total_size(sizeof(u_int32_t)); |
0af5f6c1 | 665 | if (inst->flags & NFULNL_CFG_F_SEQ_GLOBAL) |
df6fb868 | 666 | size += nla_total_size(sizeof(u_int32_t)); |
0af5f6c1 | 667 | |
0597f268 HW |
668 | qthreshold = inst->qthreshold; |
669 | /* per-rule qthreshold overrides per-instance */ | |
5ca431f9 EL |
670 | if (li->u.ulog.qthreshold) |
671 | if (qthreshold > li->u.ulog.qthreshold) | |
672 | qthreshold = li->u.ulog.qthreshold; | |
673 | ||
601e68e1 | 674 | |
0597f268 HW |
675 | switch (inst->copy_mode) { |
676 | case NFULNL_COPY_META: | |
677 | case NFULNL_COPY_NONE: | |
678 | data_len = 0; | |
679 | break; | |
601e68e1 | 680 | |
0597f268 | 681 | case NFULNL_COPY_PACKET: |
c1e7dc91 | 682 | if (inst->copy_range > skb->len) |
0597f268 HW |
683 | data_len = skb->len; |
684 | else | |
685 | data_len = inst->copy_range; | |
601e68e1 | 686 | |
df6fb868 | 687 | size += nla_total_size(data_len); |
0597f268 | 688 | break; |
601e68e1 | 689 | |
f5c5440d | 690 | case NFULNL_COPY_DISABLED: |
0597f268 | 691 | default: |
55b5a91e | 692 | goto unlock_and_release; |
0597f268 HW |
693 | } |
694 | ||
9dfa1dfe | 695 | if (inst->skb && size > skb_tailroom(inst->skb)) { |
0597f268 HW |
696 | /* either the queue len is too high or we don't have |
697 | * enough room in the skb left. flush to userspace. */ | |
e3567061 | 698 | __nfulnl_flush(inst); |
55b5a91e | 699 | } |
0597f268 | 700 | |
55b5a91e | 701 | if (!inst->skb) { |
afff14f6 G |
702 | inst->skb = nfulnl_alloc_skb(net, inst->peer_portid, |
703 | inst->nlbufsiz, size); | |
55b5a91e | 704 | if (!inst->skb) |
0597f268 | 705 | goto alloc_failure; |
0597f268 HW |
706 | } |
707 | ||
0597f268 HW |
708 | inst->qlen++; |
709 | ||
9368a53c | 710 | __build_packet_message(log, inst, skb, data_len, pf, |
8248779b | 711 | hooknum, in, out, prefix, plen); |
0597f268 | 712 | |
d63b043d MM |
713 | if (inst->qlen >= qthreshold) |
714 | __nfulnl_flush(inst); | |
0597f268 HW |
715 | /* timer_pending always called within inst->lock, so there |
716 | * is no chance of a race here */ | |
d63b043d | 717 | else if (!timer_pending(&inst->timer)) { |
0597f268 HW |
718 | instance_get(inst); |
719 | inst->timer.expires = jiffies + (inst->flushtimeout*HZ/100); | |
720 | add_timer(&inst->timer); | |
721 | } | |
0597f268 | 722 | |
ed32abea MM |
723 | unlock_and_release: |
724 | spin_unlock_bh(&inst->lock); | |
725 | instance_put(inst); | |
0597f268 HW |
726 | return; |
727 | ||
728 | alloc_failure: | |
0597f268 | 729 | /* FIXME: statistics */ |
ed32abea | 730 | goto unlock_and_release; |
0597f268 | 731 | } |
5f7340ef | 732 | EXPORT_SYMBOL_GPL(nfulnl_log_packet); |
0597f268 HW |
733 | |
734 | static int | |
735 | nfulnl_rcv_nl_event(struct notifier_block *this, | |
736 | unsigned long event, void *ptr) | |
737 | { | |
738 | struct netlink_notify *n = ptr; | |
9368a53c | 739 | struct nfnl_log_net *log = nfnl_log_pernet(n->net); |
0597f268 | 740 | |
dee5817e | 741 | if (event == NETLINK_URELEASE && n->protocol == NETLINK_NETFILTER) { |
0597f268 HW |
742 | int i; |
743 | ||
15e47304 | 744 | /* destroy all instances for this portid */ |
9368a53c | 745 | spin_lock_bh(&log->instances_lock); |
0597f268 | 746 | for (i = 0; i < INSTANCE_BUCKETS; i++) { |
b67bfe0d | 747 | struct hlist_node *t2; |
0597f268 | 748 | struct nfulnl_instance *inst; |
9368a53c | 749 | struct hlist_head *head = &log->instance_table[i]; |
0597f268 | 750 | |
b67bfe0d | 751 | hlist_for_each_entry_safe(inst, t2, head, hlist) { |
9368a53c | 752 | if (n->portid == inst->peer_portid) |
0597f268 HW |
753 | __instance_destroy(inst); |
754 | } | |
755 | } | |
9368a53c | 756 | spin_unlock_bh(&log->instances_lock); |
0597f268 HW |
757 | } |
758 | return NOTIFY_DONE; | |
759 | } | |
760 | ||
761 | static struct notifier_block nfulnl_rtnl_notifier = { | |
762 | .notifier_call = nfulnl_rcv_nl_event, | |
763 | }; | |
764 | ||
765 | static int | |
766 | nfulnl_recv_unsupp(struct sock *ctnl, struct sk_buff *skb, | |
39938324 PM |
767 | const struct nlmsghdr *nlh, |
768 | const struct nlattr * const nfqa[]) | |
0597f268 HW |
769 | { |
770 | return -ENOTSUPP; | |
771 | } | |
772 | ||
ca735b3a | 773 | static struct nf_logger nfulnl_logger __read_mostly = { |
0597f268 | 774 | .name = "nfnetlink_log", |
5962815a | 775 | .type = NF_LOG_TYPE_ULOG, |
0597f268 HW |
776 | .logfn = &nfulnl_log_packet, |
777 | .me = THIS_MODULE, | |
778 | }; | |
779 | ||
fd8281ad PM |
780 | static const struct nla_policy nfula_cfg_policy[NFULA_CFG_MAX+1] = { |
781 | [NFULA_CFG_CMD] = { .len = sizeof(struct nfulnl_msg_config_cmd) }, | |
782 | [NFULA_CFG_MODE] = { .len = sizeof(struct nfulnl_msg_config_mode) }, | |
783 | [NFULA_CFG_TIMEOUT] = { .type = NLA_U32 }, | |
784 | [NFULA_CFG_QTHRESH] = { .type = NLA_U32 }, | |
785 | [NFULA_CFG_NLBUFSIZ] = { .type = NLA_U32 }, | |
786 | [NFULA_CFG_FLAGS] = { .type = NLA_U16 }, | |
0597f268 HW |
787 | }; |
788 | ||
789 | static int | |
790 | nfulnl_recv_config(struct sock *ctnl, struct sk_buff *skb, | |
39938324 PM |
791 | const struct nlmsghdr *nlh, |
792 | const struct nlattr * const nfula[]) | |
0597f268 | 793 | { |
d550d095 | 794 | struct nfgenmsg *nfmsg = nlmsg_data(nlh); |
0597f268 HW |
795 | u_int16_t group_num = ntohs(nfmsg->res_id); |
796 | struct nfulnl_instance *inst; | |
b7047a1c | 797 | struct nfulnl_msg_config_cmd *cmd = NULL; |
30e0c6a6 | 798 | struct net *net = sock_net(ctnl); |
9368a53c | 799 | struct nfnl_log_net *log = nfnl_log_pernet(net); |
0597f268 HW |
800 | int ret = 0; |
801 | ||
b7047a1c PM |
802 | if (nfula[NFULA_CFG_CMD]) { |
803 | u_int8_t pf = nfmsg->nfgen_family; | |
804 | cmd = nla_data(nfula[NFULA_CFG_CMD]); | |
805 | ||
806 | /* Commands without queue context */ | |
807 | switch (cmd->command) { | |
808 | case NFULNL_CFG_CMD_PF_BIND: | |
30e0c6a6 | 809 | return nf_log_bind_pf(net, pf, &nfulnl_logger); |
b7047a1c | 810 | case NFULNL_CFG_CMD_PF_UNBIND: |
30e0c6a6 | 811 | nf_log_unbind_pf(net, pf); |
b7047a1c PM |
812 | return 0; |
813 | } | |
814 | } | |
815 | ||
9368a53c | 816 | inst = instance_lookup_get(log, group_num); |
15e47304 | 817 | if (inst && inst->peer_portid != NETLINK_CB(skb).portid) { |
c0506365 PM |
818 | ret = -EPERM; |
819 | goto out_put; | |
820 | } | |
821 | ||
b7047a1c | 822 | if (cmd != NULL) { |
0597f268 HW |
823 | switch (cmd->command) { |
824 | case NFULNL_CFG_CMD_BIND: | |
825 | if (inst) { | |
826 | ret = -EBUSY; | |
827 | goto out_put; | |
828 | } | |
829 | ||
9368a53c | 830 | inst = instance_create(net, group_num, |
15e47304 | 831 | NETLINK_CB(skb).portid, |
e32123e5 | 832 | sk_user_ns(NETLINK_CB(skb).sk)); |
baab2ce7 PM |
833 | if (IS_ERR(inst)) { |
834 | ret = PTR_ERR(inst); | |
f414c16c | 835 | goto out; |
0597f268 HW |
836 | } |
837 | break; | |
838 | case NFULNL_CFG_CMD_UNBIND: | |
839 | if (!inst) { | |
840 | ret = -ENODEV; | |
f414c16c | 841 | goto out; |
0597f268 HW |
842 | } |
843 | ||
9368a53c | 844 | instance_destroy(log, inst); |
a49c6503 | 845 | goto out_put; |
0597f268 | 846 | default: |
cd21f0ac | 847 | ret = -ENOTSUPP; |
0597f268 HW |
848 | break; |
849 | } | |
0597f268 HW |
850 | } |
851 | ||
df6fb868 | 852 | if (nfula[NFULA_CFG_MODE]) { |
0597f268 | 853 | struct nfulnl_msg_config_mode *params; |
df6fb868 | 854 | params = nla_data(nfula[NFULA_CFG_MODE]); |
0597f268 | 855 | |
c0506365 PM |
856 | if (!inst) { |
857 | ret = -ENODEV; | |
858 | goto out; | |
859 | } | |
0597f268 | 860 | nfulnl_set_mode(inst, params->copy_mode, |
d1208b99 | 861 | ntohl(params->copy_range)); |
0597f268 HW |
862 | } |
863 | ||
df6fb868 | 864 | if (nfula[NFULA_CFG_TIMEOUT]) { |
0dfedd28 | 865 | __be32 timeout = nla_get_be32(nfula[NFULA_CFG_TIMEOUT]); |
0597f268 | 866 | |
c0506365 PM |
867 | if (!inst) { |
868 | ret = -ENODEV; | |
869 | goto out; | |
870 | } | |
0597f268 HW |
871 | nfulnl_set_timeout(inst, ntohl(timeout)); |
872 | } | |
873 | ||
df6fb868 | 874 | if (nfula[NFULA_CFG_NLBUFSIZ]) { |
0dfedd28 | 875 | __be32 nlbufsiz = nla_get_be32(nfula[NFULA_CFG_NLBUFSIZ]); |
0597f268 | 876 | |
c0506365 PM |
877 | if (!inst) { |
878 | ret = -ENODEV; | |
879 | goto out; | |
880 | } | |
0597f268 HW |
881 | nfulnl_set_nlbufsiz(inst, ntohl(nlbufsiz)); |
882 | } | |
883 | ||
df6fb868 | 884 | if (nfula[NFULA_CFG_QTHRESH]) { |
0dfedd28 | 885 | __be32 qthresh = nla_get_be32(nfula[NFULA_CFG_QTHRESH]); |
0597f268 | 886 | |
c0506365 PM |
887 | if (!inst) { |
888 | ret = -ENODEV; | |
889 | goto out; | |
890 | } | |
0597f268 HW |
891 | nfulnl_set_qthresh(inst, ntohl(qthresh)); |
892 | } | |
893 | ||
df6fb868 | 894 | if (nfula[NFULA_CFG_FLAGS]) { |
0dfedd28 | 895 | __be16 flags = nla_get_be16(nfula[NFULA_CFG_FLAGS]); |
c0506365 PM |
896 | |
897 | if (!inst) { | |
898 | ret = -ENODEV; | |
899 | goto out; | |
900 | } | |
ee433530 | 901 | nfulnl_set_flags(inst, ntohs(flags)); |
0af5f6c1 HW |
902 | } |
903 | ||
0597f268 HW |
904 | out_put: |
905 | instance_put(inst); | |
dd16704e | 906 | out: |
0597f268 HW |
907 | return ret; |
908 | } | |
909 | ||
7c8d4cb4 | 910 | static const struct nfnl_callback nfulnl_cb[NFULNL_MSG_MAX] = { |
0597f268 | 911 | [NFULNL_MSG_PACKET] = { .call = nfulnl_recv_unsupp, |
37d2e7a2 | 912 | .attr_count = NFULA_MAX, }, |
0597f268 | 913 | [NFULNL_MSG_CONFIG] = { .call = nfulnl_recv_config, |
fd8281ad PM |
914 | .attr_count = NFULA_CFG_MAX, |
915 | .policy = nfula_cfg_policy }, | |
0597f268 HW |
916 | }; |
917 | ||
7c8d4cb4 | 918 | static const struct nfnetlink_subsystem nfulnl_subsys = { |
0597f268 HW |
919 | .name = "log", |
920 | .subsys_id = NFNL_SUBSYS_ULOG, | |
921 | .cb_count = NFULNL_MSG_MAX, | |
0597f268 HW |
922 | .cb = nfulnl_cb, |
923 | }; | |
924 | ||
925 | #ifdef CONFIG_PROC_FS | |
926 | struct iter_state { | |
9368a53c | 927 | struct seq_net_private p; |
0597f268 HW |
928 | unsigned int bucket; |
929 | }; | |
930 | ||
9368a53c | 931 | static struct hlist_node *get_first(struct net *net, struct iter_state *st) |
0597f268 | 932 | { |
9368a53c | 933 | struct nfnl_log_net *log; |
0597f268 HW |
934 | if (!st) |
935 | return NULL; | |
936 | ||
9368a53c G |
937 | log = nfnl_log_pernet(net); |
938 | ||
0597f268 | 939 | for (st->bucket = 0; st->bucket < INSTANCE_BUCKETS; st->bucket++) { |
9368a53c G |
940 | struct hlist_head *head = &log->instance_table[st->bucket]; |
941 | ||
942 | if (!hlist_empty(head)) | |
943 | return rcu_dereference_bh(hlist_first_rcu(head)); | |
0597f268 HW |
944 | } |
945 | return NULL; | |
946 | } | |
947 | ||
9368a53c G |
948 | static struct hlist_node *get_next(struct net *net, struct iter_state *st, |
949 | struct hlist_node *h) | |
0597f268 | 950 | { |
0e60ebe0 | 951 | h = rcu_dereference_bh(hlist_next_rcu(h)); |
0597f268 | 952 | while (!h) { |
9368a53c G |
953 | struct nfnl_log_net *log; |
954 | struct hlist_head *head; | |
955 | ||
0597f268 HW |
956 | if (++st->bucket >= INSTANCE_BUCKETS) |
957 | return NULL; | |
958 | ||
9368a53c G |
959 | log = nfnl_log_pernet(net); |
960 | head = &log->instance_table[st->bucket]; | |
961 | h = rcu_dereference_bh(hlist_first_rcu(head)); | |
0597f268 HW |
962 | } |
963 | return h; | |
964 | } | |
965 | ||
9368a53c G |
966 | static struct hlist_node *get_idx(struct net *net, struct iter_state *st, |
967 | loff_t pos) | |
0597f268 HW |
968 | { |
969 | struct hlist_node *head; | |
9368a53c | 970 | head = get_first(net, st); |
0597f268 HW |
971 | |
972 | if (head) | |
9368a53c | 973 | while (pos && (head = get_next(net, st, head))) |
0597f268 HW |
974 | pos--; |
975 | return pos ? NULL : head; | |
976 | } | |
977 | ||
9368a53c | 978 | static void *seq_start(struct seq_file *s, loff_t *pos) |
bed1be20 | 979 | __acquires(rcu_bh) |
0597f268 | 980 | { |
bed1be20 | 981 | rcu_read_lock_bh(); |
9368a53c | 982 | return get_idx(seq_file_net(s), s->private, *pos); |
0597f268 HW |
983 | } |
984 | ||
985 | static void *seq_next(struct seq_file *s, void *v, loff_t *pos) | |
986 | { | |
987 | (*pos)++; | |
9368a53c | 988 | return get_next(seq_file_net(s), s->private, v); |
0597f268 HW |
989 | } |
990 | ||
991 | static void seq_stop(struct seq_file *s, void *v) | |
bed1be20 | 992 | __releases(rcu_bh) |
0597f268 | 993 | { |
bed1be20 | 994 | rcu_read_unlock_bh(); |
0597f268 HW |
995 | } |
996 | ||
997 | static int seq_show(struct seq_file *s, void *v) | |
998 | { | |
999 | const struct nfulnl_instance *inst = v; | |
1000 | ||
601e68e1 | 1001 | return seq_printf(s, "%5d %6d %5d %1d %5d %6d %2d\n", |
0597f268 | 1002 | inst->group_num, |
15e47304 | 1003 | inst->peer_portid, inst->qlen, |
0597f268 HW |
1004 | inst->copy_mode, inst->copy_range, |
1005 | inst->flushtimeout, atomic_read(&inst->use)); | |
1006 | } | |
1007 | ||
56b3d975 | 1008 | static const struct seq_operations nful_seq_ops = { |
0597f268 HW |
1009 | .start = seq_start, |
1010 | .next = seq_next, | |
1011 | .stop = seq_stop, | |
1012 | .show = seq_show, | |
1013 | }; | |
1014 | ||
1015 | static int nful_open(struct inode *inode, struct file *file) | |
1016 | { | |
9368a53c G |
1017 | return seq_open_net(inode, file, &nful_seq_ops, |
1018 | sizeof(struct iter_state)); | |
0597f268 HW |
1019 | } |
1020 | ||
da7071d7 | 1021 | static const struct file_operations nful_file_ops = { |
0597f268 HW |
1022 | .owner = THIS_MODULE, |
1023 | .open = nful_open, | |
1024 | .read = seq_read, | |
1025 | .llseek = seq_lseek, | |
9368a53c | 1026 | .release = seq_release_net, |
0597f268 HW |
1027 | }; |
1028 | ||
1029 | #endif /* PROC_FS */ | |
1030 | ||
9368a53c | 1031 | static int __net_init nfnl_log_net_init(struct net *net) |
0597f268 | 1032 | { |
9368a53c G |
1033 | unsigned int i; |
1034 | struct nfnl_log_net *log = nfnl_log_pernet(net); | |
601e68e1 | 1035 | |
0597f268 | 1036 | for (i = 0; i < INSTANCE_BUCKETS; i++) |
9368a53c G |
1037 | INIT_HLIST_HEAD(&log->instance_table[i]); |
1038 | spin_lock_init(&log->instances_lock); | |
1039 | ||
1040 | #ifdef CONFIG_PROC_FS | |
1041 | if (!proc_create("nfnetlink_log", 0440, | |
1042 | net->nf.proc_netfilter, &nful_file_ops)) | |
1043 | return -ENOMEM; | |
1044 | #endif | |
1045 | return 0; | |
1046 | } | |
1047 | ||
1048 | static void __net_exit nfnl_log_net_exit(struct net *net) | |
1049 | { | |
e778f56e | 1050 | #ifdef CONFIG_PROC_FS |
9368a53c | 1051 | remove_proc_entry("nfnetlink_log", net->nf.proc_netfilter); |
e778f56e | 1052 | #endif |
45c2aff6 | 1053 | nf_log_unset(net, &nfulnl_logger); |
9368a53c G |
1054 | } |
1055 | ||
1056 | static struct pernet_operations nfnl_log_net_ops = { | |
1057 | .init = nfnl_log_net_init, | |
1058 | .exit = nfnl_log_net_exit, | |
1059 | .id = &nfnl_log_net_id, | |
1060 | .size = sizeof(struct nfnl_log_net), | |
1061 | }; | |
1062 | ||
1063 | static int __init nfnetlink_log_init(void) | |
1064 | { | |
1065 | int status = -ENOMEM; | |
601e68e1 | 1066 | |
0597f268 HW |
1067 | netlink_register_notifier(&nfulnl_rtnl_notifier); |
1068 | status = nfnetlink_subsys_register(&nfulnl_subsys); | |
1069 | if (status < 0) { | |
beacd3e8 | 1070 | pr_err("failed to create netlink socket\n"); |
0597f268 HW |
1071 | goto cleanup_netlink_notifier; |
1072 | } | |
1073 | ||
ca735b3a EL |
1074 | status = nf_log_register(NFPROTO_UNSPEC, &nfulnl_logger); |
1075 | if (status < 0) { | |
beacd3e8 | 1076 | pr_err("failed to register logger\n"); |
ca735b3a EL |
1077 | goto cleanup_subsys; |
1078 | } | |
1079 | ||
9368a53c G |
1080 | status = register_pernet_subsys(&nfnl_log_net_ops); |
1081 | if (status < 0) { | |
beacd3e8 | 1082 | pr_err("failed to register pernet ops\n"); |
ca735b3a | 1083 | goto cleanup_logger; |
6fc09f10 | 1084 | } |
0597f268 HW |
1085 | return status; |
1086 | ||
ca735b3a EL |
1087 | cleanup_logger: |
1088 | nf_log_unregister(&nfulnl_logger); | |
0597f268 | 1089 | cleanup_subsys: |
0597f268 HW |
1090 | nfnetlink_subsys_unregister(&nfulnl_subsys); |
1091 | cleanup_netlink_notifier: | |
1092 | netlink_unregister_notifier(&nfulnl_rtnl_notifier); | |
1093 | return status; | |
1094 | } | |
1095 | ||
65b4b4e8 | 1096 | static void __exit nfnetlink_log_fini(void) |
0597f268 | 1097 | { |
9368a53c | 1098 | unregister_pernet_subsys(&nfnl_log_net_ops); |
e92ad99c | 1099 | nf_log_unregister(&nfulnl_logger); |
32292a7f PM |
1100 | nfnetlink_subsys_unregister(&nfulnl_subsys); |
1101 | netlink_unregister_notifier(&nfulnl_rtnl_notifier); | |
0597f268 HW |
1102 | } |
1103 | ||
1104 | MODULE_DESCRIPTION("netfilter userspace logging"); | |
1105 | MODULE_AUTHOR("Harald Welte <laforge@netfilter.org>"); | |
1106 | MODULE_LICENSE("GPL"); | |
f682faef | 1107 | MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_ULOG); |
fab4085f PNA |
1108 | MODULE_ALIAS_NF_LOGGER(AF_INET, 1); |
1109 | MODULE_ALIAS_NF_LOGGER(AF_INET6, 1); | |
1110 | MODULE_ALIAS_NF_LOGGER(AF_BRIDGE, 1); | |
0597f268 | 1111 | |
65b4b4e8 AM |
1112 | module_init(nfnetlink_log_init); |
1113 | module_exit(nfnetlink_log_fini); |