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Commit | Line | Data |
---|---|---|
0597f268 HW |
1 | /* |
2 | * This is a module which is used for logging packets to userspace via | |
3 | * nfetlink. | |
4 | * | |
5 | * (C) 2005 by Harald Welte <laforge@netfilter.org> | |
f229f6ce | 6 | * (C) 2006-2012 Patrick McHardy <kaber@trash.net> |
0597f268 HW |
7 | * |
8 | * Based on the old ipv4-only ipt_ULOG.c: | |
9 | * (C) 2000-2004 by Harald Welte <laforge@netfilter.org> | |
10 | * | |
11 | * This program is free software; you can redistribute it and/or modify | |
12 | * it under the terms of the GNU General Public License version 2 as | |
13 | * published by the Free Software Foundation. | |
0597f268 | 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> | |
a29a9a58 | 30 | #include <linux/netfilter/nf_conntrack_common.h> |
0597f268 HW |
31 | #include <linux/spinlock.h> |
32 | #include <linux/sysctl.h> | |
33 | #include <linux/proc_fs.h> | |
34 | #include <linux/security.h> | |
35 | #include <linux/list.h> | |
5a0e3ad6 | 36 | #include <linux/slab.h> |
0597f268 | 37 | #include <net/sock.h> |
f01ffbd6 | 38 | #include <net/netfilter/nf_log.h> |
9368a53c | 39 | #include <net/netns/generic.h> |
d9e15007 | 40 | #include <net/netfilter/nfnetlink_log.h> |
0597f268 | 41 | |
60063497 | 42 | #include <linux/atomic.h> |
b54ab92b RE |
43 | #include <linux/refcount.h> |
44 | ||
0597f268 | 45 | |
1109a90c | 46 | #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER) |
fbcd923c HW |
47 | #include "../bridge/br_private.h" |
48 | #endif | |
49 | ||
c2db2924 | 50 | #define NFULNL_NLBUFSIZ_DEFAULT NLMSG_GOODSIZE |
2c6764b7 | 51 | #define NFULNL_TIMEOUT_DEFAULT 100 /* every second */ |
0597f268 | 52 | #define NFULNL_QTHRESH_DEFAULT 100 /* 100 packets */ |
c1e7dc91 FW |
53 | /* max packet size is limited by 16-bit struct nfattr nfa_len field */ |
54 | #define NFULNL_COPY_RANGE_MAX (0xFFFF - NLA_HDRLEN) | |
0597f268 HW |
55 | |
56 | #define PRINTR(x, args...) do { if (net_ratelimit()) \ | |
57 | printk(x, ## args); } while (0); | |
58 | ||
0597f268 HW |
59 | struct nfulnl_instance { |
60 | struct hlist_node hlist; /* global list of instances */ | |
61 | spinlock_t lock; | |
b54ab92b | 62 | refcount_t use; /* use count */ |
0597f268 HW |
63 | |
64 | unsigned int qlen; /* number of nlmsgs in skb */ | |
65 | struct sk_buff *skb; /* pre-allocatd skb */ | |
0597f268 | 66 | struct timer_list timer; |
9368a53c | 67 | struct net *net; |
9eea9515 | 68 | struct user_namespace *peer_user_ns; /* User namespace of the peer process */ |
cc6bc448 | 69 | u32 peer_portid; /* PORTID of the peer process */ |
0597f268 HW |
70 | |
71 | /* configurable parameters */ | |
72 | unsigned int flushtimeout; /* timeout until queue flush */ | |
73 | unsigned int nlbufsiz; /* netlink buffer allocation size */ | |
74 | unsigned int qthreshold; /* threshold of the queue */ | |
75 | u_int32_t copy_range; | |
0af5f6c1 | 76 | u_int32_t seq; /* instance-local sequential counter */ |
0597f268 | 77 | u_int16_t group_num; /* number of this queue */ |
0af5f6c1 | 78 | u_int16_t flags; |
601e68e1 | 79 | u_int8_t copy_mode; |
bed1be20 | 80 | struct rcu_head rcu; |
0597f268 HW |
81 | }; |
82 | ||
0597f268 | 83 | #define INSTANCE_BUCKETS 16 |
0597f268 | 84 | |
c7d03a00 | 85 | static unsigned int nfnl_log_net_id __read_mostly; |
9368a53c G |
86 | |
87 | struct nfnl_log_net { | |
88 | spinlock_t instances_lock; | |
89 | struct hlist_head instance_table[INSTANCE_BUCKETS]; | |
90 | atomic_t global_seq; | |
91 | }; | |
92 | ||
93 | static struct nfnl_log_net *nfnl_log_pernet(struct net *net) | |
94 | { | |
95 | return net_generic(net, nfnl_log_net_id); | |
96 | } | |
97 | ||
0597f268 HW |
98 | static inline u_int8_t instance_hashfn(u_int16_t group_num) |
99 | { | |
100 | return ((group_num & 0xff) % INSTANCE_BUCKETS); | |
101 | } | |
102 | ||
103 | static struct nfulnl_instance * | |
9368a53c | 104 | __instance_lookup(struct nfnl_log_net *log, u_int16_t group_num) |
0597f268 HW |
105 | { |
106 | struct hlist_head *head; | |
0597f268 HW |
107 | struct nfulnl_instance *inst; |
108 | ||
9368a53c | 109 | head = &log->instance_table[instance_hashfn(group_num)]; |
b67bfe0d | 110 | hlist_for_each_entry_rcu(inst, head, hlist) { |
0597f268 HW |
111 | if (inst->group_num == group_num) |
112 | return inst; | |
113 | } | |
114 | return NULL; | |
115 | } | |
116 | ||
117 | static inline void | |
118 | instance_get(struct nfulnl_instance *inst) | |
119 | { | |
b54ab92b | 120 | refcount_inc(&inst->use); |
0597f268 HW |
121 | } |
122 | ||
123 | static struct nfulnl_instance * | |
9368a53c | 124 | instance_lookup_get(struct nfnl_log_net *log, u_int16_t group_num) |
0597f268 HW |
125 | { |
126 | struct nfulnl_instance *inst; | |
127 | ||
bed1be20 | 128 | rcu_read_lock_bh(); |
9368a53c | 129 | inst = __instance_lookup(log, group_num); |
b54ab92b | 130 | if (inst && !refcount_inc_not_zero(&inst->use)) |
f5c5440d | 131 | inst = NULL; |
bed1be20 | 132 | rcu_read_unlock_bh(); |
0597f268 HW |
133 | |
134 | return inst; | |
135 | } | |
136 | ||
bed1be20 ED |
137 | static void nfulnl_instance_free_rcu(struct rcu_head *head) |
138 | { | |
9368a53c G |
139 | struct nfulnl_instance *inst = |
140 | container_of(head, struct nfulnl_instance, rcu); | |
141 | ||
142 | put_net(inst->net); | |
143 | kfree(inst); | |
bed1be20 ED |
144 | module_put(THIS_MODULE); |
145 | } | |
146 | ||
0597f268 HW |
147 | static void |
148 | instance_put(struct nfulnl_instance *inst) | |
149 | { | |
b54ab92b | 150 | if (inst && refcount_dec_and_test(&inst->use)) |
bed1be20 | 151 | call_rcu_bh(&inst->rcu, nfulnl_instance_free_rcu); |
0597f268 HW |
152 | } |
153 | ||
154 | static void nfulnl_timer(unsigned long data); | |
155 | ||
156 | static struct nfulnl_instance * | |
9368a53c | 157 | instance_create(struct net *net, u_int16_t group_num, |
cc6bc448 | 158 | u32 portid, struct user_namespace *user_ns) |
0597f268 HW |
159 | { |
160 | struct nfulnl_instance *inst; | |
9368a53c | 161 | struct nfnl_log_net *log = nfnl_log_pernet(net); |
baab2ce7 | 162 | int err; |
0597f268 | 163 | |
9368a53c G |
164 | spin_lock_bh(&log->instances_lock); |
165 | if (__instance_lookup(log, group_num)) { | |
baab2ce7 | 166 | err = -EEXIST; |
0597f268 HW |
167 | goto out_unlock; |
168 | } | |
169 | ||
10dfdc69 | 170 | inst = kzalloc(sizeof(*inst), GFP_ATOMIC); |
baab2ce7 PM |
171 | if (!inst) { |
172 | err = -ENOMEM; | |
0597f268 | 173 | goto out_unlock; |
baab2ce7 | 174 | } |
0597f268 | 175 | |
aace57e0 MM |
176 | if (!try_module_get(THIS_MODULE)) { |
177 | kfree(inst); | |
baab2ce7 | 178 | err = -EAGAIN; |
aace57e0 MM |
179 | goto out_unlock; |
180 | } | |
181 | ||
0597f268 | 182 | INIT_HLIST_NODE(&inst->hlist); |
181a46a5 | 183 | spin_lock_init(&inst->lock); |
0597f268 | 184 | /* needs to be two, since we _put() after creation */ |
b54ab92b | 185 | refcount_set(&inst->use, 2); |
0597f268 | 186 | |
e6f689db | 187 | setup_timer(&inst->timer, nfulnl_timer, (unsigned long)inst); |
0597f268 | 188 | |
9368a53c | 189 | inst->net = get_net(net); |
9eea9515 | 190 | inst->peer_user_ns = user_ns; |
15e47304 | 191 | inst->peer_portid = portid; |
0597f268 HW |
192 | inst->group_num = group_num; |
193 | ||
194 | inst->qthreshold = NFULNL_QTHRESH_DEFAULT; | |
195 | inst->flushtimeout = NFULNL_TIMEOUT_DEFAULT; | |
196 | inst->nlbufsiz = NFULNL_NLBUFSIZ_DEFAULT; | |
197 | inst->copy_mode = NFULNL_COPY_PACKET; | |
6b6ec99a | 198 | inst->copy_range = NFULNL_COPY_RANGE_MAX; |
0597f268 | 199 | |
f5c5440d | 200 | hlist_add_head_rcu(&inst->hlist, |
9368a53c G |
201 | &log->instance_table[instance_hashfn(group_num)]); |
202 | ||
0597f268 | 203 | |
9368a53c | 204 | spin_unlock_bh(&log->instances_lock); |
0597f268 HW |
205 | |
206 | return inst; | |
207 | ||
0597f268 | 208 | out_unlock: |
9368a53c | 209 | spin_unlock_bh(&log->instances_lock); |
baab2ce7 | 210 | return ERR_PTR(err); |
0597f268 HW |
211 | } |
212 | ||
e3567061 | 213 | static void __nfulnl_flush(struct nfulnl_instance *inst); |
0597f268 | 214 | |
f5c5440d | 215 | /* called with BH disabled */ |
0597f268 | 216 | static void |
9afdb00c | 217 | __instance_destroy(struct nfulnl_instance *inst) |
0597f268 HW |
218 | { |
219 | /* first pull it out of the global list */ | |
f5c5440d | 220 | hlist_del_rcu(&inst->hlist); |
0597f268 | 221 | |
0597f268 HW |
222 | /* then flush all pending packets from skb */ |
223 | ||
f5c5440d ED |
224 | spin_lock(&inst->lock); |
225 | ||
226 | /* lockless readers wont be able to use us */ | |
227 | inst->copy_mode = NFULNL_COPY_DISABLED; | |
228 | ||
e3567061 MM |
229 | if (inst->skb) |
230 | __nfulnl_flush(inst); | |
f5c5440d | 231 | spin_unlock(&inst->lock); |
0597f268 HW |
232 | |
233 | /* and finally put the refcount */ | |
234 | instance_put(inst); | |
0597f268 HW |
235 | } |
236 | ||
0597f268 | 237 | static inline void |
9368a53c G |
238 | instance_destroy(struct nfnl_log_net *log, |
239 | struct nfulnl_instance *inst) | |
0597f268 | 240 | { |
9368a53c | 241 | spin_lock_bh(&log->instances_lock); |
9afdb00c | 242 | __instance_destroy(inst); |
9368a53c | 243 | spin_unlock_bh(&log->instances_lock); |
0597f268 HW |
244 | } |
245 | ||
246 | static int | |
247 | nfulnl_set_mode(struct nfulnl_instance *inst, u_int8_t mode, | |
248 | unsigned int range) | |
249 | { | |
250 | int status = 0; | |
251 | ||
252 | spin_lock_bh(&inst->lock); | |
601e68e1 | 253 | |
0597f268 HW |
254 | switch (mode) { |
255 | case NFULNL_COPY_NONE: | |
256 | case NFULNL_COPY_META: | |
257 | inst->copy_mode = mode; | |
258 | inst->copy_range = 0; | |
259 | break; | |
601e68e1 | 260 | |
0597f268 HW |
261 | case NFULNL_COPY_PACKET: |
262 | inst->copy_mode = mode; | |
c1e7dc91 FW |
263 | if (range == 0) |
264 | range = NFULNL_COPY_RANGE_MAX; | |
6b6ec99a MM |
265 | inst->copy_range = min_t(unsigned int, |
266 | range, NFULNL_COPY_RANGE_MAX); | |
0597f268 | 267 | break; |
601e68e1 | 268 | |
0597f268 HW |
269 | default: |
270 | status = -EINVAL; | |
271 | break; | |
272 | } | |
273 | ||
274 | spin_unlock_bh(&inst->lock); | |
275 | ||
276 | return status; | |
277 | } | |
278 | ||
279 | static int | |
280 | nfulnl_set_nlbufsiz(struct nfulnl_instance *inst, u_int32_t nlbufsiz) | |
281 | { | |
282 | int status; | |
283 | ||
284 | spin_lock_bh(&inst->lock); | |
285 | if (nlbufsiz < NFULNL_NLBUFSIZ_DEFAULT) | |
286 | status = -ERANGE; | |
287 | else if (nlbufsiz > 131072) | |
288 | status = -ERANGE; | |
289 | else { | |
290 | inst->nlbufsiz = nlbufsiz; | |
291 | status = 0; | |
292 | } | |
293 | spin_unlock_bh(&inst->lock); | |
294 | ||
295 | return status; | |
296 | } | |
297 | ||
23509fcd | 298 | static void |
0597f268 HW |
299 | nfulnl_set_timeout(struct nfulnl_instance *inst, u_int32_t timeout) |
300 | { | |
301 | spin_lock_bh(&inst->lock); | |
302 | inst->flushtimeout = timeout; | |
303 | spin_unlock_bh(&inst->lock); | |
0597f268 HW |
304 | } |
305 | ||
23509fcd | 306 | static void |
0597f268 HW |
307 | nfulnl_set_qthresh(struct nfulnl_instance *inst, u_int32_t qthresh) |
308 | { | |
309 | spin_lock_bh(&inst->lock); | |
310 | inst->qthreshold = qthresh; | |
311 | spin_unlock_bh(&inst->lock); | |
0597f268 HW |
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); |
0813fbc9 | 335 | skb = alloc_skb(n, GFP_ATOMIC | __GFP_NOWARN); |
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 | |
905f0a73 | 341 | skb = alloc_skb(pkt_size, GFP_ATOMIC); |
ad2ad0f9 | 342 | } |
0597f268 HW |
343 | } |
344 | ||
345 | return skb; | |
346 | } | |
347 | ||
b51d3fa3 | 348 | static void |
0597f268 HW |
349 | __nfulnl_send(struct nfulnl_instance *inst) |
350 | { | |
d550d095 DM |
351 | if (inst->qlen > 1) { |
352 | struct nlmsghdr *nlh = nlmsg_put(inst->skb, 0, 0, | |
353 | NLMSG_DONE, | |
354 | sizeof(struct nfgenmsg), | |
355 | 0); | |
b51d3fa3 HL |
356 | if (WARN_ONCE(!nlh, "bad nlskb size: %u, tailroom %d\n", |
357 | inst->skb->len, skb_tailroom(inst->skb))) { | |
358 | kfree_skb(inst->skb); | |
d550d095 | 359 | goto out; |
b51d3fa3 | 360 | } |
d550d095 | 361 | } |
b51d3fa3 HL |
362 | nfnetlink_unicast(inst->skb, inst->net, inst->peer_portid, |
363 | MSG_DONTWAIT); | |
364 | out: | |
0597f268 HW |
365 | inst->qlen = 0; |
366 | inst->skb = NULL; | |
0597f268 HW |
367 | } |
368 | ||
e3567061 MM |
369 | static void |
370 | __nfulnl_flush(struct nfulnl_instance *inst) | |
371 | { | |
372 | /* timer holds a reference */ | |
373 | if (del_timer(&inst->timer)) | |
374 | instance_put(inst); | |
375 | if (inst->skb) | |
376 | __nfulnl_send(inst); | |
377 | } | |
378 | ||
c6a8f648 MM |
379 | static void |
380 | nfulnl_timer(unsigned long data) | |
0597f268 | 381 | { |
601e68e1 | 382 | struct nfulnl_instance *inst = (struct nfulnl_instance *)data; |
0597f268 | 383 | |
0597f268 | 384 | spin_lock_bh(&inst->lock); |
370e6a87 MM |
385 | if (inst->skb) |
386 | __nfulnl_send(inst); | |
0597f268 | 387 | spin_unlock_bh(&inst->lock); |
05f7b7b3 | 388 | instance_put(inst); |
0597f268 HW |
389 | } |
390 | ||
0af5f6c1 HW |
391 | /* This is an inline function, we don't really care about a long |
392 | * list of arguments */ | |
601e68e1 | 393 | static inline int |
9368a53c G |
394 | __build_packet_message(struct nfnl_log_net *log, |
395 | struct nfulnl_instance *inst, | |
601e68e1 | 396 | const struct sk_buff *skb, |
0597f268 | 397 | unsigned int data_len, |
76108cea | 398 | u_int8_t pf, |
0597f268 HW |
399 | unsigned int hooknum, |
400 | const struct net_device *indev, | |
401 | const struct net_device *outdev, | |
a29a9a58 KM |
402 | const char *prefix, unsigned int plen, |
403 | const struct nfnl_ct_hook *nfnl_ct, | |
404 | struct nf_conn *ct, enum ip_conntrack_info ctinfo) | |
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, |
dedb67c4 | 414 | nfnl_msg_type(NFNL_SUBSYS_ULOG, 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" */ |
e2361cb9 AC |
447 | /* rcu_read_lock()ed by nf_hook_thresh or |
448 | * nf_log_packet. | |
449 | */ | |
1db20a52 DM |
450 | nla_put_be32(inst->skb, NFULA_IFINDEX_INDEV, |
451 | htonl(br_port_get_rcu(indev)->br->dev->ifindex))) | |
452 | goto nla_put_failure; | |
fbcd923c | 453 | } else { |
c737b7c4 FW |
454 | struct net_device *physindev; |
455 | ||
fbcd923c HW |
456 | /* Case 2: indev is bridge group, we need to look for |
457 | * physical device (when called from ipv4) */ | |
1db20a52 DM |
458 | if (nla_put_be32(inst->skb, NFULA_IFINDEX_INDEV, |
459 | htonl(indev->ifindex))) | |
460 | goto nla_put_failure; | |
c737b7c4 FW |
461 | |
462 | physindev = nf_bridge_get_physindev(skb); | |
463 | if (physindev && | |
1db20a52 | 464 | nla_put_be32(inst->skb, NFULA_IFINDEX_PHYSINDEV, |
c737b7c4 | 465 | htonl(physindev->ifindex))) |
1db20a52 | 466 | goto nla_put_failure; |
fbcd923c HW |
467 | } |
468 | #endif | |
0597f268 HW |
469 | } |
470 | ||
471 | if (outdev) { | |
1109a90c | 472 | #if !IS_ENABLED(CONFIG_BRIDGE_NETFILTER) |
1db20a52 DM |
473 | if (nla_put_be32(inst->skb, NFULA_IFINDEX_OUTDEV, |
474 | htonl(outdev->ifindex))) | |
475 | goto nla_put_failure; | |
fbcd923c HW |
476 | #else |
477 | if (pf == PF_BRIDGE) { | |
478 | /* Case 1: outdev is physical output device, we need to | |
479 | * look for bridge group (when called from | |
480 | * netfilter_bridge) */ | |
1db20a52 DM |
481 | if (nla_put_be32(inst->skb, NFULA_IFINDEX_PHYSOUTDEV, |
482 | htonl(outdev->ifindex)) || | |
fbcd923c | 483 | /* this is the bridge group "brX" */ |
e2361cb9 AC |
484 | /* rcu_read_lock()ed by nf_hook_thresh or |
485 | * nf_log_packet. | |
486 | */ | |
1db20a52 DM |
487 | nla_put_be32(inst->skb, NFULA_IFINDEX_OUTDEV, |
488 | htonl(br_port_get_rcu(outdev)->br->dev->ifindex))) | |
489 | goto nla_put_failure; | |
fbcd923c | 490 | } else { |
c737b7c4 FW |
491 | struct net_device *physoutdev; |
492 | ||
fbcd923c HW |
493 | /* Case 2: indev is a bridge group, we need to look |
494 | * for physical device (when called from ipv4) */ | |
1db20a52 DM |
495 | if (nla_put_be32(inst->skb, NFULA_IFINDEX_OUTDEV, |
496 | htonl(outdev->ifindex))) | |
497 | goto nla_put_failure; | |
c737b7c4 FW |
498 | |
499 | physoutdev = nf_bridge_get_physoutdev(skb); | |
500 | if (physoutdev && | |
1db20a52 | 501 | nla_put_be32(inst->skb, NFULA_IFINDEX_PHYSOUTDEV, |
c737b7c4 | 502 | htonl(physoutdev->ifindex))) |
1db20a52 | 503 | goto nla_put_failure; |
fbcd923c HW |
504 | } |
505 | #endif | |
0597f268 HW |
506 | } |
507 | ||
1db20a52 DM |
508 | if (skb->mark && |
509 | nla_put_be32(inst->skb, NFULA_MARK, htonl(skb->mark))) | |
510 | goto nla_put_failure; | |
0597f268 | 511 | |
2c38de4c NC |
512 | if (indev && skb->dev && |
513 | skb->mac_header != skb->network_header) { | |
0597f268 | 514 | struct nfulnl_msg_packet_hw phw; |
e4d091d7 DC |
515 | int len; |
516 | ||
517 | memset(&phw, 0, sizeof(phw)); | |
518 | len = dev_parse_header(skb, phw.hw_addr); | |
b95cce35 SH |
519 | if (len > 0) { |
520 | phw.hw_addrlen = htons(len); | |
1db20a52 DM |
521 | if (nla_put(inst->skb, NFULA_HWADDR, sizeof(phw), &phw)) |
522 | goto nla_put_failure; | |
b95cce35 | 523 | } |
0597f268 HW |
524 | } |
525 | ||
72961ecf | 526 | if (indev && skb_mac_header_was_set(skb)) { |
2dba62c3 | 527 | if (nla_put_be16(inst->skb, NFULA_HWTYPE, htons(skb->dev->type)) || |
1db20a52 | 528 | nla_put_be16(inst->skb, NFULA_HWLEN, |
0c36b48b BH |
529 | htons(skb->dev->hard_header_len))) |
530 | goto nla_put_failure; | |
531 | ||
532 | hwhdrp = skb_mac_header(skb); | |
533 | ||
534 | if (skb->dev->type == ARPHRD_SIT) | |
535 | hwhdrp -= ETH_HLEN; | |
536 | ||
537 | if (hwhdrp >= skb->head && | |
538 | nla_put(inst->skb, NFULA_HWHEADER, | |
539 | skb->dev->hard_header_len, hwhdrp)) | |
1db20a52 | 540 | goto nla_put_failure; |
72961ecf EL |
541 | } |
542 | ||
2456e855 | 543 | if (skb->tstamp) { |
0597f268 | 544 | struct nfulnl_msg_packet_timestamp ts; |
f6389ecb AB |
545 | struct timespec64 kts = ktime_to_timespec64(skb->tstamp); |
546 | ts.sec = cpu_to_be64(kts.tv_sec); | |
547 | ts.usec = cpu_to_be64(kts.tv_nsec / NSEC_PER_USEC); | |
0597f268 | 548 | |
1db20a52 DM |
549 | if (nla_put(inst->skb, NFULA_TIMESTAMP, sizeof(ts), &ts)) |
550 | goto nla_put_failure; | |
0597f268 HW |
551 | } |
552 | ||
553 | /* UID */ | |
0626af31 | 554 | sk = skb->sk; |
a8399231 | 555 | if (sk && sk_fullsock(sk)) { |
0626af31 ED |
556 | read_lock_bh(&sk->sk_callback_lock); |
557 | if (sk->sk_socket && sk->sk_socket->file) { | |
558 | struct file *file = sk->sk_socket->file; | |
437589a7 LT |
559 | const struct cred *cred = file->f_cred; |
560 | struct user_namespace *user_ns = inst->peer_user_ns; | |
561 | __be32 uid = htonl(from_kuid_munged(user_ns, cred->fsuid)); | |
562 | __be32 gid = htonl(from_kgid_munged(user_ns, cred->fsgid)); | |
0626af31 | 563 | read_unlock_bh(&sk->sk_callback_lock); |
1db20a52 DM |
564 | if (nla_put_be32(inst->skb, NFULA_UID, uid) || |
565 | nla_put_be32(inst->skb, NFULA_GID, gid)) | |
566 | goto nla_put_failure; | |
0597f268 | 567 | } else |
0626af31 | 568 | read_unlock_bh(&sk->sk_callback_lock); |
0597f268 HW |
569 | } |
570 | ||
0af5f6c1 | 571 | /* local sequence number */ |
1db20a52 DM |
572 | if ((inst->flags & NFULNL_CFG_F_SEQ) && |
573 | nla_put_be32(inst->skb, NFULA_SEQ, htonl(inst->seq++))) | |
574 | goto nla_put_failure; | |
0dfedd28 | 575 | |
0af5f6c1 | 576 | /* global sequence number */ |
1db20a52 DM |
577 | if ((inst->flags & NFULNL_CFG_F_SEQ_GLOBAL) && |
578 | nla_put_be32(inst->skb, NFULA_SEQ_GLOBAL, | |
9368a53c | 579 | htonl(atomic_inc_return(&log->global_seq)))) |
1db20a52 | 580 | goto nla_put_failure; |
0af5f6c1 | 581 | |
a29a9a58 KM |
582 | if (ct && nfnl_ct->build(inst->skb, ct, ctinfo, |
583 | NFULA_CT, NFULA_CT_INFO) < 0) | |
584 | goto nla_put_failure; | |
585 | ||
0597f268 | 586 | if (data_len) { |
df6fb868 PM |
587 | struct nlattr *nla; |
588 | int size = nla_attr_size(data_len); | |
0597f268 | 589 | |
82251615 PNA |
590 | if (skb_tailroom(inst->skb) < nla_total_size(data_len)) |
591 | goto nla_put_failure; | |
0597f268 | 592 | |
df6fb868 PM |
593 | nla = (struct nlattr *)skb_put(inst->skb, nla_total_size(data_len)); |
594 | nla->nla_type = NFULA_PAYLOAD; | |
595 | nla->nla_len = size; | |
0597f268 | 596 | |
df6fb868 | 597 | if (skb_copy_bits(skb, 0, nla_data(nla), data_len)) |
0597f268 HW |
598 | BUG(); |
599 | } | |
601e68e1 | 600 | |
0597f268 HW |
601 | nlh->nlmsg_len = inst->skb->tail - old_tail; |
602 | return 0; | |
603 | ||
df6fb868 | 604 | nla_put_failure: |
0597f268 HW |
605 | PRINTR(KERN_ERR "nfnetlink_log: error creating log nlmsg\n"); |
606 | return -1; | |
607 | } | |
608 | ||
0597f268 HW |
609 | static struct nf_loginfo default_loginfo = { |
610 | .type = NF_LOG_TYPE_ULOG, | |
611 | .u = { | |
612 | .ulog = { | |
613 | .copy_len = 0xffff, | |
614 | .group = 0, | |
615 | .qthreshold = 1, | |
616 | }, | |
617 | }, | |
618 | }; | |
619 | ||
620 | /* log handler for internal netfilter logging api */ | |
5f7340ef | 621 | void |
8cdb46da HS |
622 | nfulnl_log_packet(struct net *net, |
623 | u_int8_t pf, | |
0597f268 HW |
624 | unsigned int hooknum, |
625 | const struct sk_buff *skb, | |
626 | const struct net_device *in, | |
627 | const struct net_device *out, | |
628 | const struct nf_loginfo *li_user, | |
629 | const char *prefix) | |
630 | { | |
a29a9a58 KM |
631 | size_t size; |
632 | unsigned int data_len; | |
0597f268 HW |
633 | struct nfulnl_instance *inst; |
634 | const struct nf_loginfo *li; | |
635 | unsigned int qthreshold; | |
d7a5c324 | 636 | unsigned int plen; |
9368a53c | 637 | struct nfnl_log_net *log = nfnl_log_pernet(net); |
a29a9a58 KM |
638 | const struct nfnl_ct_hook *nfnl_ct = NULL; |
639 | struct nf_conn *ct = NULL; | |
640 | enum ip_conntrack_info uninitialized_var(ctinfo); | |
0597f268 | 641 | |
601e68e1 | 642 | if (li_user && li_user->type == NF_LOG_TYPE_ULOG) |
0597f268 HW |
643 | li = li_user; |
644 | else | |
645 | li = &default_loginfo; | |
646 | ||
9368a53c | 647 | inst = instance_lookup_get(log, li->u.ulog.group); |
0597f268 | 648 | if (!inst) |
0597f268 | 649 | return; |
0597f268 | 650 | |
d7a5c324 PM |
651 | plen = 0; |
652 | if (prefix) | |
881dbfe8 | 653 | plen = strlen(prefix) + 1; |
d7a5c324 | 654 | |
0597f268 HW |
655 | /* FIXME: do we want to make the size calculation conditional based on |
656 | * what is actually present? way more branches and checks, but more | |
657 | * memory efficient... */ | |
573ce260 | 658 | size = nlmsg_total_size(sizeof(struct nfgenmsg)) |
df6fb868 PM |
659 | + nla_total_size(sizeof(struct nfulnl_msg_packet_hdr)) |
660 | + nla_total_size(sizeof(u_int32_t)) /* ifindex */ | |
661 | + nla_total_size(sizeof(u_int32_t)) /* ifindex */ | |
1109a90c | 662 | #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER) |
df6fb868 PM |
663 | + nla_total_size(sizeof(u_int32_t)) /* ifindex */ |
664 | + nla_total_size(sizeof(u_int32_t)) /* ifindex */ | |
fbcd923c | 665 | #endif |
df6fb868 PM |
666 | + nla_total_size(sizeof(u_int32_t)) /* mark */ |
667 | + nla_total_size(sizeof(u_int32_t)) /* uid */ | |
76aa1ce1 | 668 | + nla_total_size(sizeof(u_int32_t)) /* gid */ |
df6fb868 PM |
669 | + nla_total_size(plen) /* prefix */ |
670 | + nla_total_size(sizeof(struct nfulnl_msg_packet_hw)) | |
9dfa1dfe FW |
671 | + nla_total_size(sizeof(struct nfulnl_msg_packet_timestamp)) |
672 | + nla_total_size(sizeof(struct nfgenmsg)); /* NLMSG_DONE */ | |
0597f268 | 673 | |
eeff9bee PNA |
674 | if (in && skb_mac_header_was_set(skb)) { |
675 | size += nla_total_size(skb->dev->hard_header_len) | |
676 | + nla_total_size(sizeof(u_int16_t)) /* hwtype */ | |
677 | + nla_total_size(sizeof(u_int16_t)); /* hwlen */ | |
678 | } | |
679 | ||
0597f268 HW |
680 | spin_lock_bh(&inst->lock); |
681 | ||
0af5f6c1 | 682 | if (inst->flags & NFULNL_CFG_F_SEQ) |
df6fb868 | 683 | size += nla_total_size(sizeof(u_int32_t)); |
0af5f6c1 | 684 | if (inst->flags & NFULNL_CFG_F_SEQ_GLOBAL) |
df6fb868 | 685 | size += nla_total_size(sizeof(u_int32_t)); |
a29a9a58 KM |
686 | if (inst->flags & NFULNL_CFG_F_CONNTRACK) { |
687 | nfnl_ct = rcu_dereference(nfnl_ct_hook); | |
688 | if (nfnl_ct != NULL) { | |
689 | ct = nfnl_ct->get_ct(skb, &ctinfo); | |
690 | if (ct != NULL) | |
691 | size += nfnl_ct->build_size(ct); | |
692 | } | |
693 | } | |
0af5f6c1 | 694 | |
0597f268 HW |
695 | qthreshold = inst->qthreshold; |
696 | /* per-rule qthreshold overrides per-instance */ | |
5ca431f9 EL |
697 | if (li->u.ulog.qthreshold) |
698 | if (qthreshold > li->u.ulog.qthreshold) | |
699 | qthreshold = li->u.ulog.qthreshold; | |
700 | ||
601e68e1 | 701 | |
0597f268 HW |
702 | switch (inst->copy_mode) { |
703 | case NFULNL_COPY_META: | |
704 | case NFULNL_COPY_NONE: | |
705 | data_len = 0; | |
706 | break; | |
601e68e1 | 707 | |
0597f268 | 708 | case NFULNL_COPY_PACKET: |
7643507f VP |
709 | data_len = inst->copy_range; |
710 | if ((li->u.ulog.flags & NF_LOG_F_COPY_LEN) && | |
711 | (li->u.ulog.copy_len < data_len)) | |
712 | data_len = li->u.ulog.copy_len; | |
713 | ||
714 | if (data_len > skb->len) | |
0597f268 | 715 | data_len = skb->len; |
601e68e1 | 716 | |
df6fb868 | 717 | size += nla_total_size(data_len); |
0597f268 | 718 | break; |
601e68e1 | 719 | |
f5c5440d | 720 | case NFULNL_COPY_DISABLED: |
0597f268 | 721 | default: |
55b5a91e | 722 | goto unlock_and_release; |
0597f268 HW |
723 | } |
724 | ||
9dfa1dfe | 725 | if (inst->skb && size > skb_tailroom(inst->skb)) { |
0597f268 HW |
726 | /* either the queue len is too high or we don't have |
727 | * enough room in the skb left. flush to userspace. */ | |
e3567061 | 728 | __nfulnl_flush(inst); |
55b5a91e | 729 | } |
0597f268 | 730 | |
55b5a91e | 731 | if (!inst->skb) { |
afff14f6 G |
732 | inst->skb = nfulnl_alloc_skb(net, inst->peer_portid, |
733 | inst->nlbufsiz, size); | |
55b5a91e | 734 | if (!inst->skb) |
0597f268 | 735 | goto alloc_failure; |
0597f268 HW |
736 | } |
737 | ||
0597f268 HW |
738 | inst->qlen++; |
739 | ||
9368a53c | 740 | __build_packet_message(log, inst, skb, data_len, pf, |
a29a9a58 KM |
741 | hooknum, in, out, prefix, plen, |
742 | nfnl_ct, ct, ctinfo); | |
0597f268 | 743 | |
d63b043d MM |
744 | if (inst->qlen >= qthreshold) |
745 | __nfulnl_flush(inst); | |
0597f268 HW |
746 | /* timer_pending always called within inst->lock, so there |
747 | * is no chance of a race here */ | |
d63b043d | 748 | else if (!timer_pending(&inst->timer)) { |
0597f268 HW |
749 | instance_get(inst); |
750 | inst->timer.expires = jiffies + (inst->flushtimeout*HZ/100); | |
751 | add_timer(&inst->timer); | |
752 | } | |
0597f268 | 753 | |
ed32abea MM |
754 | unlock_and_release: |
755 | spin_unlock_bh(&inst->lock); | |
756 | instance_put(inst); | |
0597f268 HW |
757 | return; |
758 | ||
759 | alloc_failure: | |
0597f268 | 760 | /* FIXME: statistics */ |
ed32abea | 761 | goto unlock_and_release; |
0597f268 | 762 | } |
5f7340ef | 763 | EXPORT_SYMBOL_GPL(nfulnl_log_packet); |
0597f268 HW |
764 | |
765 | static int | |
766 | nfulnl_rcv_nl_event(struct notifier_block *this, | |
767 | unsigned long event, void *ptr) | |
768 | { | |
769 | struct netlink_notify *n = ptr; | |
9368a53c | 770 | struct nfnl_log_net *log = nfnl_log_pernet(n->net); |
0597f268 | 771 | |
dee5817e | 772 | if (event == NETLINK_URELEASE && n->protocol == NETLINK_NETFILTER) { |
0597f268 HW |
773 | int i; |
774 | ||
15e47304 | 775 | /* destroy all instances for this portid */ |
9368a53c | 776 | spin_lock_bh(&log->instances_lock); |
0597f268 | 777 | for (i = 0; i < INSTANCE_BUCKETS; i++) { |
b67bfe0d | 778 | struct hlist_node *t2; |
0597f268 | 779 | struct nfulnl_instance *inst; |
9368a53c | 780 | struct hlist_head *head = &log->instance_table[i]; |
0597f268 | 781 | |
b67bfe0d | 782 | hlist_for_each_entry_safe(inst, t2, head, hlist) { |
9368a53c | 783 | if (n->portid == inst->peer_portid) |
0597f268 HW |
784 | __instance_destroy(inst); |
785 | } | |
786 | } | |
9368a53c | 787 | spin_unlock_bh(&log->instances_lock); |
0597f268 HW |
788 | } |
789 | return NOTIFY_DONE; | |
790 | } | |
791 | ||
792 | static struct notifier_block nfulnl_rtnl_notifier = { | |
793 | .notifier_call = nfulnl_rcv_nl_event, | |
794 | }; | |
795 | ||
7b8002a1 PNA |
796 | static int nfulnl_recv_unsupp(struct net *net, struct sock *ctnl, |
797 | struct sk_buff *skb, const struct nlmsghdr *nlh, | |
798 | const struct nlattr * const nfqa[]) | |
0597f268 HW |
799 | { |
800 | return -ENOTSUPP; | |
801 | } | |
802 | ||
ca735b3a | 803 | static struct nf_logger nfulnl_logger __read_mostly = { |
0597f268 | 804 | .name = "nfnetlink_log", |
5962815a | 805 | .type = NF_LOG_TYPE_ULOG, |
d4ef3835 | 806 | .logfn = nfulnl_log_packet, |
0597f268 HW |
807 | .me = THIS_MODULE, |
808 | }; | |
809 | ||
fd8281ad PM |
810 | static const struct nla_policy nfula_cfg_policy[NFULA_CFG_MAX+1] = { |
811 | [NFULA_CFG_CMD] = { .len = sizeof(struct nfulnl_msg_config_cmd) }, | |
812 | [NFULA_CFG_MODE] = { .len = sizeof(struct nfulnl_msg_config_mode) }, | |
813 | [NFULA_CFG_TIMEOUT] = { .type = NLA_U32 }, | |
814 | [NFULA_CFG_QTHRESH] = { .type = NLA_U32 }, | |
815 | [NFULA_CFG_NLBUFSIZ] = { .type = NLA_U32 }, | |
816 | [NFULA_CFG_FLAGS] = { .type = NLA_U16 }, | |
0597f268 HW |
817 | }; |
818 | ||
7b8002a1 PNA |
819 | static int nfulnl_recv_config(struct net *net, struct sock *ctnl, |
820 | struct sk_buff *skb, const struct nlmsghdr *nlh, | |
821 | const struct nlattr * const nfula[]) | |
0597f268 | 822 | { |
d550d095 | 823 | struct nfgenmsg *nfmsg = nlmsg_data(nlh); |
0597f268 HW |
824 | u_int16_t group_num = ntohs(nfmsg->res_id); |
825 | struct nfulnl_instance *inst; | |
b7047a1c | 826 | struct nfulnl_msg_config_cmd *cmd = NULL; |
9368a53c | 827 | struct nfnl_log_net *log = nfnl_log_pernet(net); |
0597f268 | 828 | int ret = 0; |
c872a2d9 | 829 | u16 flags = 0; |
0597f268 | 830 | |
b7047a1c PM |
831 | if (nfula[NFULA_CFG_CMD]) { |
832 | u_int8_t pf = nfmsg->nfgen_family; | |
833 | cmd = nla_data(nfula[NFULA_CFG_CMD]); | |
834 | ||
835 | /* Commands without queue context */ | |
836 | switch (cmd->command) { | |
837 | case NFULNL_CFG_CMD_PF_BIND: | |
30e0c6a6 | 838 | return nf_log_bind_pf(net, pf, &nfulnl_logger); |
b7047a1c | 839 | case NFULNL_CFG_CMD_PF_UNBIND: |
30e0c6a6 | 840 | nf_log_unbind_pf(net, pf); |
b7047a1c PM |
841 | return 0; |
842 | } | |
843 | } | |
844 | ||
9368a53c | 845 | inst = instance_lookup_get(log, group_num); |
15e47304 | 846 | if (inst && inst->peer_portid != NETLINK_CB(skb).portid) { |
c0506365 PM |
847 | ret = -EPERM; |
848 | goto out_put; | |
849 | } | |
850 | ||
8cbc8708 PN |
851 | /* Check if we support these flags in first place, dependencies should |
852 | * be there too not to break atomicity. | |
853 | */ | |
854 | if (nfula[NFULA_CFG_FLAGS]) { | |
855 | flags = ntohs(nla_get_be16(nfula[NFULA_CFG_FLAGS])); | |
856 | ||
857 | if ((flags & NFULNL_CFG_F_CONNTRACK) && | |
858 | !rcu_access_pointer(nfnl_ct_hook)) { | |
859 | #ifdef CONFIG_MODULES | |
860 | nfnl_unlock(NFNL_SUBSYS_ULOG); | |
861 | request_module("ip_conntrack_netlink"); | |
862 | nfnl_lock(NFNL_SUBSYS_ULOG); | |
863 | if (rcu_access_pointer(nfnl_ct_hook)) { | |
864 | ret = -EAGAIN; | |
865 | goto out_put; | |
866 | } | |
867 | #endif | |
868 | ret = -EOPNOTSUPP; | |
869 | goto out_put; | |
870 | } | |
871 | } | |
872 | ||
b7047a1c | 873 | if (cmd != NULL) { |
0597f268 HW |
874 | switch (cmd->command) { |
875 | case NFULNL_CFG_CMD_BIND: | |
876 | if (inst) { | |
877 | ret = -EBUSY; | |
878 | goto out_put; | |
879 | } | |
880 | ||
9368a53c | 881 | inst = instance_create(net, group_num, |
15e47304 | 882 | NETLINK_CB(skb).portid, |
e32123e5 | 883 | sk_user_ns(NETLINK_CB(skb).sk)); |
baab2ce7 PM |
884 | if (IS_ERR(inst)) { |
885 | ret = PTR_ERR(inst); | |
f414c16c | 886 | goto out; |
0597f268 HW |
887 | } |
888 | break; | |
889 | case NFULNL_CFG_CMD_UNBIND: | |
890 | if (!inst) { | |
891 | ret = -ENODEV; | |
f414c16c | 892 | goto out; |
0597f268 HW |
893 | } |
894 | ||
9368a53c | 895 | instance_destroy(log, inst); |
a49c6503 | 896 | goto out_put; |
0597f268 | 897 | default: |
cd21f0ac | 898 | ret = -ENOTSUPP; |
eb075954 | 899 | goto out_put; |
0597f268 | 900 | } |
336a3b3e PNA |
901 | } else if (!inst) { |
902 | ret = -ENODEV; | |
903 | goto out; | |
0597f268 HW |
904 | } |
905 | ||
df6fb868 | 906 | if (nfula[NFULA_CFG_MODE]) { |
336a3b3e PNA |
907 | struct nfulnl_msg_config_mode *params = |
908 | nla_data(nfula[NFULA_CFG_MODE]); | |
0597f268 HW |
909 | |
910 | nfulnl_set_mode(inst, params->copy_mode, | |
d1208b99 | 911 | ntohl(params->copy_range)); |
0597f268 HW |
912 | } |
913 | ||
df6fb868 | 914 | if (nfula[NFULA_CFG_TIMEOUT]) { |
0dfedd28 | 915 | __be32 timeout = nla_get_be32(nfula[NFULA_CFG_TIMEOUT]); |
0597f268 HW |
916 | |
917 | nfulnl_set_timeout(inst, ntohl(timeout)); | |
918 | } | |
919 | ||
df6fb868 | 920 | if (nfula[NFULA_CFG_NLBUFSIZ]) { |
0dfedd28 | 921 | __be32 nlbufsiz = nla_get_be32(nfula[NFULA_CFG_NLBUFSIZ]); |
0597f268 HW |
922 | |
923 | nfulnl_set_nlbufsiz(inst, ntohl(nlbufsiz)); | |
924 | } | |
925 | ||
df6fb868 | 926 | if (nfula[NFULA_CFG_QTHRESH]) { |
0dfedd28 | 927 | __be32 qthresh = nla_get_be32(nfula[NFULA_CFG_QTHRESH]); |
0597f268 HW |
928 | |
929 | nfulnl_set_qthresh(inst, ntohl(qthresh)); | |
930 | } | |
931 | ||
8cbc8708 | 932 | if (nfula[NFULA_CFG_FLAGS]) |
a29a9a58 | 933 | nfulnl_set_flags(inst, flags); |
0af5f6c1 | 934 | |
0597f268 HW |
935 | out_put: |
936 | instance_put(inst); | |
dd16704e | 937 | out: |
0597f268 HW |
938 | return ret; |
939 | } | |
940 | ||
7c8d4cb4 | 941 | static const struct nfnl_callback nfulnl_cb[NFULNL_MSG_MAX] = { |
0597f268 | 942 | [NFULNL_MSG_PACKET] = { .call = nfulnl_recv_unsupp, |
37d2e7a2 | 943 | .attr_count = NFULA_MAX, }, |
0597f268 | 944 | [NFULNL_MSG_CONFIG] = { .call = nfulnl_recv_config, |
fd8281ad PM |
945 | .attr_count = NFULA_CFG_MAX, |
946 | .policy = nfula_cfg_policy }, | |
0597f268 HW |
947 | }; |
948 | ||
7c8d4cb4 | 949 | static const struct nfnetlink_subsystem nfulnl_subsys = { |
0597f268 HW |
950 | .name = "log", |
951 | .subsys_id = NFNL_SUBSYS_ULOG, | |
952 | .cb_count = NFULNL_MSG_MAX, | |
0597f268 HW |
953 | .cb = nfulnl_cb, |
954 | }; | |
955 | ||
956 | #ifdef CONFIG_PROC_FS | |
957 | struct iter_state { | |
9368a53c | 958 | struct seq_net_private p; |
0597f268 HW |
959 | unsigned int bucket; |
960 | }; | |
961 | ||
9368a53c | 962 | static struct hlist_node *get_first(struct net *net, struct iter_state *st) |
0597f268 | 963 | { |
9368a53c | 964 | struct nfnl_log_net *log; |
0597f268 HW |
965 | if (!st) |
966 | return NULL; | |
967 | ||
9368a53c G |
968 | log = nfnl_log_pernet(net); |
969 | ||
0597f268 | 970 | for (st->bucket = 0; st->bucket < INSTANCE_BUCKETS; st->bucket++) { |
9368a53c G |
971 | struct hlist_head *head = &log->instance_table[st->bucket]; |
972 | ||
973 | if (!hlist_empty(head)) | |
974 | return rcu_dereference_bh(hlist_first_rcu(head)); | |
0597f268 HW |
975 | } |
976 | return NULL; | |
977 | } | |
978 | ||
9368a53c G |
979 | static struct hlist_node *get_next(struct net *net, struct iter_state *st, |
980 | struct hlist_node *h) | |
0597f268 | 981 | { |
0e60ebe0 | 982 | h = rcu_dereference_bh(hlist_next_rcu(h)); |
0597f268 | 983 | while (!h) { |
9368a53c G |
984 | struct nfnl_log_net *log; |
985 | struct hlist_head *head; | |
986 | ||
0597f268 HW |
987 | if (++st->bucket >= INSTANCE_BUCKETS) |
988 | return NULL; | |
989 | ||
9368a53c G |
990 | log = nfnl_log_pernet(net); |
991 | head = &log->instance_table[st->bucket]; | |
992 | h = rcu_dereference_bh(hlist_first_rcu(head)); | |
0597f268 HW |
993 | } |
994 | return h; | |
995 | } | |
996 | ||
9368a53c G |
997 | static struct hlist_node *get_idx(struct net *net, struct iter_state *st, |
998 | loff_t pos) | |
0597f268 HW |
999 | { |
1000 | struct hlist_node *head; | |
9368a53c | 1001 | head = get_first(net, st); |
0597f268 HW |
1002 | |
1003 | if (head) | |
9368a53c | 1004 | while (pos && (head = get_next(net, st, head))) |
0597f268 HW |
1005 | pos--; |
1006 | return pos ? NULL : head; | |
1007 | } | |
1008 | ||
9368a53c | 1009 | static void *seq_start(struct seq_file *s, loff_t *pos) |
bed1be20 | 1010 | __acquires(rcu_bh) |
0597f268 | 1011 | { |
bed1be20 | 1012 | rcu_read_lock_bh(); |
9368a53c | 1013 | return get_idx(seq_file_net(s), s->private, *pos); |
0597f268 HW |
1014 | } |
1015 | ||
1016 | static void *seq_next(struct seq_file *s, void *v, loff_t *pos) | |
1017 | { | |
1018 | (*pos)++; | |
9368a53c | 1019 | return get_next(seq_file_net(s), s->private, v); |
0597f268 HW |
1020 | } |
1021 | ||
1022 | static void seq_stop(struct seq_file *s, void *v) | |
bed1be20 | 1023 | __releases(rcu_bh) |
0597f268 | 1024 | { |
bed1be20 | 1025 | rcu_read_unlock_bh(); |
0597f268 HW |
1026 | } |
1027 | ||
1028 | static int seq_show(struct seq_file *s, void *v) | |
1029 | { | |
1030 | const struct nfulnl_instance *inst = v; | |
1031 | ||
20a1d165 | 1032 | seq_printf(s, "%5u %6u %5u %1u %5u %6u %2u\n", |
1ca9e417 JP |
1033 | inst->group_num, |
1034 | inst->peer_portid, inst->qlen, | |
1035 | inst->copy_mode, inst->copy_range, | |
b54ab92b | 1036 | inst->flushtimeout, refcount_read(&inst->use)); |
1ca9e417 JP |
1037 | |
1038 | return 0; | |
0597f268 HW |
1039 | } |
1040 | ||
56b3d975 | 1041 | static const struct seq_operations nful_seq_ops = { |
0597f268 HW |
1042 | .start = seq_start, |
1043 | .next = seq_next, | |
1044 | .stop = seq_stop, | |
1045 | .show = seq_show, | |
1046 | }; | |
1047 | ||
1048 | static int nful_open(struct inode *inode, struct file *file) | |
1049 | { | |
9368a53c G |
1050 | return seq_open_net(inode, file, &nful_seq_ops, |
1051 | sizeof(struct iter_state)); | |
0597f268 HW |
1052 | } |
1053 | ||
da7071d7 | 1054 | static const struct file_operations nful_file_ops = { |
0597f268 HW |
1055 | .owner = THIS_MODULE, |
1056 | .open = nful_open, | |
1057 | .read = seq_read, | |
1058 | .llseek = seq_lseek, | |
9368a53c | 1059 | .release = seq_release_net, |
0597f268 HW |
1060 | }; |
1061 | ||
1062 | #endif /* PROC_FS */ | |
1063 | ||
9368a53c | 1064 | static int __net_init nfnl_log_net_init(struct net *net) |
0597f268 | 1065 | { |
9368a53c G |
1066 | unsigned int i; |
1067 | struct nfnl_log_net *log = nfnl_log_pernet(net); | |
f13f2aee PW |
1068 | #ifdef CONFIG_PROC_FS |
1069 | struct proc_dir_entry *proc; | |
1070 | kuid_t root_uid; | |
1071 | kgid_t root_gid; | |
1072 | #endif | |
601e68e1 | 1073 | |
0597f268 | 1074 | for (i = 0; i < INSTANCE_BUCKETS; i++) |
9368a53c G |
1075 | INIT_HLIST_HEAD(&log->instance_table[i]); |
1076 | spin_lock_init(&log->instances_lock); | |
1077 | ||
1078 | #ifdef CONFIG_PROC_FS | |
f13f2aee PW |
1079 | proc = proc_create("nfnetlink_log", 0440, |
1080 | net->nf.proc_netfilter, &nful_file_ops); | |
1081 | if (!proc) | |
9368a53c | 1082 | return -ENOMEM; |
f13f2aee PW |
1083 | |
1084 | root_uid = make_kuid(net->user_ns, 0); | |
1085 | root_gid = make_kgid(net->user_ns, 0); | |
1086 | if (uid_valid(root_uid) && gid_valid(root_gid)) | |
1087 | proc_set_user(proc, root_uid, root_gid); | |
9368a53c G |
1088 | #endif |
1089 | return 0; | |
1090 | } | |
1091 | ||
1092 | static void __net_exit nfnl_log_net_exit(struct net *net) | |
1093 | { | |
e778f56e | 1094 | #ifdef CONFIG_PROC_FS |
9368a53c | 1095 | remove_proc_entry("nfnetlink_log", net->nf.proc_netfilter); |
e778f56e | 1096 | #endif |
45c2aff6 | 1097 | nf_log_unset(net, &nfulnl_logger); |
9368a53c G |
1098 | } |
1099 | ||
1100 | static struct pernet_operations nfnl_log_net_ops = { | |
1101 | .init = nfnl_log_net_init, | |
1102 | .exit = nfnl_log_net_exit, | |
1103 | .id = &nfnl_log_net_id, | |
1104 | .size = sizeof(struct nfnl_log_net), | |
1105 | }; | |
1106 | ||
1107 | static int __init nfnetlink_log_init(void) | |
1108 | { | |
3bfe0498 FR |
1109 | int status; |
1110 | ||
1111 | status = register_pernet_subsys(&nfnl_log_net_ops); | |
1112 | if (status < 0) { | |
1113 | pr_err("failed to register pernet ops\n"); | |
1114 | goto out; | |
1115 | } | |
601e68e1 | 1116 | |
0597f268 HW |
1117 | netlink_register_notifier(&nfulnl_rtnl_notifier); |
1118 | status = nfnetlink_subsys_register(&nfulnl_subsys); | |
1119 | if (status < 0) { | |
beacd3e8 | 1120 | pr_err("failed to create netlink socket\n"); |
0597f268 HW |
1121 | goto cleanup_netlink_notifier; |
1122 | } | |
1123 | ||
ca735b3a EL |
1124 | status = nf_log_register(NFPROTO_UNSPEC, &nfulnl_logger); |
1125 | if (status < 0) { | |
beacd3e8 | 1126 | pr_err("failed to register logger\n"); |
ca735b3a EL |
1127 | goto cleanup_subsys; |
1128 | } | |
1129 | ||
0597f268 HW |
1130 | return status; |
1131 | ||
0597f268 | 1132 | cleanup_subsys: |
0597f268 HW |
1133 | nfnetlink_subsys_unregister(&nfulnl_subsys); |
1134 | cleanup_netlink_notifier: | |
1135 | netlink_unregister_notifier(&nfulnl_rtnl_notifier); | |
3bfe0498 FR |
1136 | unregister_pernet_subsys(&nfnl_log_net_ops); |
1137 | out: | |
0597f268 HW |
1138 | return status; |
1139 | } | |
1140 | ||
65b4b4e8 | 1141 | static void __exit nfnetlink_log_fini(void) |
0597f268 | 1142 | { |
e92ad99c | 1143 | nf_log_unregister(&nfulnl_logger); |
32292a7f PM |
1144 | nfnetlink_subsys_unregister(&nfulnl_subsys); |
1145 | netlink_unregister_notifier(&nfulnl_rtnl_notifier); | |
3bfe0498 | 1146 | unregister_pernet_subsys(&nfnl_log_net_ops); |
0597f268 HW |
1147 | } |
1148 | ||
1149 | MODULE_DESCRIPTION("netfilter userspace logging"); | |
1150 | MODULE_AUTHOR("Harald Welte <laforge@netfilter.org>"); | |
1151 | MODULE_LICENSE("GPL"); | |
f682faef | 1152 | MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_ULOG); |
fab4085f PNA |
1153 | MODULE_ALIAS_NF_LOGGER(AF_INET, 1); |
1154 | MODULE_ALIAS_NF_LOGGER(AF_INET6, 1); | |
1155 | MODULE_ALIAS_NF_LOGGER(AF_BRIDGE, 1); | |
2497b846 | 1156 | MODULE_ALIAS_NF_LOGGER(3, 1); /* NFPROTO_ARP */ |
a7647080 | 1157 | MODULE_ALIAS_NF_LOGGER(5, 1); /* NFPROTO_NETDEV */ |
0597f268 | 1158 | |
65b4b4e8 AM |
1159 | module_init(nfnetlink_log_init); |
1160 | module_exit(nfnetlink_log_fini); |