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> |
0597f268 | 43 | |
1109a90c | 44 | #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER) |
fbcd923c HW |
45 | #include "../bridge/br_private.h" |
46 | #endif | |
47 | ||
c2db2924 | 48 | #define NFULNL_NLBUFSIZ_DEFAULT NLMSG_GOODSIZE |
2c6764b7 | 49 | #define NFULNL_TIMEOUT_DEFAULT 100 /* every second */ |
0597f268 | 50 | #define NFULNL_QTHRESH_DEFAULT 100 /* 100 packets */ |
c1e7dc91 FW |
51 | /* max packet size is limited by 16-bit struct nfattr nfa_len field */ |
52 | #define NFULNL_COPY_RANGE_MAX (0xFFFF - NLA_HDRLEN) | |
0597f268 HW |
53 | |
54 | #define PRINTR(x, args...) do { if (net_ratelimit()) \ | |
55 | printk(x, ## args); } while (0); | |
56 | ||
0597f268 HW |
57 | struct nfulnl_instance { |
58 | struct hlist_node hlist; /* global list of instances */ | |
59 | spinlock_t lock; | |
60 | atomic_t use; /* use count */ | |
61 | ||
62 | unsigned int qlen; /* number of nlmsgs in skb */ | |
63 | struct sk_buff *skb; /* pre-allocatd skb */ | |
0597f268 | 64 | struct timer_list timer; |
9368a53c | 65 | struct net *net; |
9eea9515 | 66 | struct user_namespace *peer_user_ns; /* User namespace of the peer process */ |
cc6bc448 | 67 | u32 peer_portid; /* PORTID of the peer process */ |
0597f268 HW |
68 | |
69 | /* configurable parameters */ | |
70 | unsigned int flushtimeout; /* timeout until queue flush */ | |
71 | unsigned int nlbufsiz; /* netlink buffer allocation size */ | |
72 | unsigned int qthreshold; /* threshold of the queue */ | |
73 | u_int32_t copy_range; | |
0af5f6c1 | 74 | u_int32_t seq; /* instance-local sequential counter */ |
0597f268 | 75 | u_int16_t group_num; /* number of this queue */ |
0af5f6c1 | 76 | u_int16_t flags; |
601e68e1 | 77 | u_int8_t copy_mode; |
bed1be20 | 78 | struct rcu_head rcu; |
0597f268 HW |
79 | }; |
80 | ||
0597f268 | 81 | #define INSTANCE_BUCKETS 16 |
0597f268 | 82 | |
9368a53c G |
83 | static int nfnl_log_net_id __read_mostly; |
84 | ||
85 | struct nfnl_log_net { | |
86 | spinlock_t instances_lock; | |
87 | struct hlist_head instance_table[INSTANCE_BUCKETS]; | |
88 | atomic_t global_seq; | |
89 | }; | |
90 | ||
91 | static struct nfnl_log_net *nfnl_log_pernet(struct net *net) | |
92 | { | |
93 | return net_generic(net, nfnl_log_net_id); | |
94 | } | |
95 | ||
0597f268 HW |
96 | static inline u_int8_t instance_hashfn(u_int16_t group_num) |
97 | { | |
98 | return ((group_num & 0xff) % INSTANCE_BUCKETS); | |
99 | } | |
100 | ||
101 | static struct nfulnl_instance * | |
9368a53c | 102 | __instance_lookup(struct nfnl_log_net *log, u_int16_t group_num) |
0597f268 HW |
103 | { |
104 | struct hlist_head *head; | |
0597f268 HW |
105 | struct nfulnl_instance *inst; |
106 | ||
9368a53c | 107 | head = &log->instance_table[instance_hashfn(group_num)]; |
b67bfe0d | 108 | hlist_for_each_entry_rcu(inst, head, hlist) { |
0597f268 HW |
109 | if (inst->group_num == group_num) |
110 | return inst; | |
111 | } | |
112 | return NULL; | |
113 | } | |
114 | ||
115 | static inline void | |
116 | instance_get(struct nfulnl_instance *inst) | |
117 | { | |
118 | atomic_inc(&inst->use); | |
119 | } | |
120 | ||
121 | static struct nfulnl_instance * | |
9368a53c | 122 | instance_lookup_get(struct nfnl_log_net *log, u_int16_t group_num) |
0597f268 HW |
123 | { |
124 | struct nfulnl_instance *inst; | |
125 | ||
bed1be20 | 126 | rcu_read_lock_bh(); |
9368a53c | 127 | inst = __instance_lookup(log, group_num); |
f5c5440d ED |
128 | if (inst && !atomic_inc_not_zero(&inst->use)) |
129 | inst = NULL; | |
bed1be20 | 130 | rcu_read_unlock_bh(); |
0597f268 HW |
131 | |
132 | return inst; | |
133 | } | |
134 | ||
bed1be20 ED |
135 | static void nfulnl_instance_free_rcu(struct rcu_head *head) |
136 | { | |
9368a53c G |
137 | struct nfulnl_instance *inst = |
138 | container_of(head, struct nfulnl_instance, rcu); | |
139 | ||
140 | put_net(inst->net); | |
141 | kfree(inst); | |
bed1be20 ED |
142 | module_put(THIS_MODULE); |
143 | } | |
144 | ||
0597f268 HW |
145 | static void |
146 | instance_put(struct nfulnl_instance *inst) | |
147 | { | |
bed1be20 ED |
148 | if (inst && atomic_dec_and_test(&inst->use)) |
149 | call_rcu_bh(&inst->rcu, nfulnl_instance_free_rcu); | |
0597f268 HW |
150 | } |
151 | ||
152 | static void nfulnl_timer(unsigned long data); | |
153 | ||
154 | static struct nfulnl_instance * | |
9368a53c | 155 | instance_create(struct net *net, u_int16_t group_num, |
cc6bc448 | 156 | u32 portid, struct user_namespace *user_ns) |
0597f268 HW |
157 | { |
158 | struct nfulnl_instance *inst; | |
9368a53c | 159 | struct nfnl_log_net *log = nfnl_log_pernet(net); |
baab2ce7 | 160 | int err; |
0597f268 | 161 | |
9368a53c G |
162 | spin_lock_bh(&log->instances_lock); |
163 | if (__instance_lookup(log, group_num)) { | |
baab2ce7 | 164 | err = -EEXIST; |
0597f268 HW |
165 | goto out_unlock; |
166 | } | |
167 | ||
10dfdc69 | 168 | inst = kzalloc(sizeof(*inst), GFP_ATOMIC); |
baab2ce7 PM |
169 | if (!inst) { |
170 | err = -ENOMEM; | |
0597f268 | 171 | goto out_unlock; |
baab2ce7 | 172 | } |
0597f268 | 173 | |
aace57e0 MM |
174 | if (!try_module_get(THIS_MODULE)) { |
175 | kfree(inst); | |
baab2ce7 | 176 | err = -EAGAIN; |
aace57e0 MM |
177 | goto out_unlock; |
178 | } | |
179 | ||
0597f268 | 180 | INIT_HLIST_NODE(&inst->hlist); |
181a46a5 | 181 | spin_lock_init(&inst->lock); |
0597f268 HW |
182 | /* needs to be two, since we _put() after creation */ |
183 | atomic_set(&inst->use, 2); | |
184 | ||
e6f689db | 185 | setup_timer(&inst->timer, nfulnl_timer, (unsigned long)inst); |
0597f268 | 186 | |
9368a53c | 187 | inst->net = get_net(net); |
9eea9515 | 188 | inst->peer_user_ns = user_ns; |
15e47304 | 189 | inst->peer_portid = portid; |
0597f268 HW |
190 | inst->group_num = group_num; |
191 | ||
192 | inst->qthreshold = NFULNL_QTHRESH_DEFAULT; | |
193 | inst->flushtimeout = NFULNL_TIMEOUT_DEFAULT; | |
194 | inst->nlbufsiz = NFULNL_NLBUFSIZ_DEFAULT; | |
195 | inst->copy_mode = NFULNL_COPY_PACKET; | |
6b6ec99a | 196 | inst->copy_range = NFULNL_COPY_RANGE_MAX; |
0597f268 | 197 | |
f5c5440d | 198 | hlist_add_head_rcu(&inst->hlist, |
9368a53c G |
199 | &log->instance_table[instance_hashfn(group_num)]); |
200 | ||
0597f268 | 201 | |
9368a53c | 202 | spin_unlock_bh(&log->instances_lock); |
0597f268 HW |
203 | |
204 | return inst; | |
205 | ||
0597f268 | 206 | out_unlock: |
9368a53c | 207 | spin_unlock_bh(&log->instances_lock); |
baab2ce7 | 208 | return ERR_PTR(err); |
0597f268 HW |
209 | } |
210 | ||
e3567061 | 211 | static void __nfulnl_flush(struct nfulnl_instance *inst); |
0597f268 | 212 | |
f5c5440d | 213 | /* called with BH disabled */ |
0597f268 | 214 | static void |
9afdb00c | 215 | __instance_destroy(struct nfulnl_instance *inst) |
0597f268 HW |
216 | { |
217 | /* first pull it out of the global list */ | |
f5c5440d | 218 | hlist_del_rcu(&inst->hlist); |
0597f268 | 219 | |
0597f268 HW |
220 | /* then flush all pending packets from skb */ |
221 | ||
f5c5440d ED |
222 | spin_lock(&inst->lock); |
223 | ||
224 | /* lockless readers wont be able to use us */ | |
225 | inst->copy_mode = NFULNL_COPY_DISABLED; | |
226 | ||
e3567061 MM |
227 | if (inst->skb) |
228 | __nfulnl_flush(inst); | |
f5c5440d | 229 | spin_unlock(&inst->lock); |
0597f268 HW |
230 | |
231 | /* and finally put the refcount */ | |
232 | instance_put(inst); | |
0597f268 HW |
233 | } |
234 | ||
0597f268 | 235 | static inline void |
9368a53c G |
236 | instance_destroy(struct nfnl_log_net *log, |
237 | struct nfulnl_instance *inst) | |
0597f268 | 238 | { |
9368a53c | 239 | spin_lock_bh(&log->instances_lock); |
9afdb00c | 240 | __instance_destroy(inst); |
9368a53c | 241 | spin_unlock_bh(&log->instances_lock); |
0597f268 HW |
242 | } |
243 | ||
244 | static int | |
245 | nfulnl_set_mode(struct nfulnl_instance *inst, u_int8_t mode, | |
246 | unsigned int range) | |
247 | { | |
248 | int status = 0; | |
249 | ||
250 | spin_lock_bh(&inst->lock); | |
601e68e1 | 251 | |
0597f268 HW |
252 | switch (mode) { |
253 | case NFULNL_COPY_NONE: | |
254 | case NFULNL_COPY_META: | |
255 | inst->copy_mode = mode; | |
256 | inst->copy_range = 0; | |
257 | break; | |
601e68e1 | 258 | |
0597f268 HW |
259 | case NFULNL_COPY_PACKET: |
260 | inst->copy_mode = mode; | |
c1e7dc91 FW |
261 | if (range == 0) |
262 | range = NFULNL_COPY_RANGE_MAX; | |
6b6ec99a MM |
263 | inst->copy_range = min_t(unsigned int, |
264 | range, NFULNL_COPY_RANGE_MAX); | |
0597f268 | 265 | break; |
601e68e1 | 266 | |
0597f268 HW |
267 | default: |
268 | status = -EINVAL; | |
269 | break; | |
270 | } | |
271 | ||
272 | spin_unlock_bh(&inst->lock); | |
273 | ||
274 | return status; | |
275 | } | |
276 | ||
277 | static int | |
278 | nfulnl_set_nlbufsiz(struct nfulnl_instance *inst, u_int32_t nlbufsiz) | |
279 | { | |
280 | int status; | |
281 | ||
282 | spin_lock_bh(&inst->lock); | |
283 | if (nlbufsiz < NFULNL_NLBUFSIZ_DEFAULT) | |
284 | status = -ERANGE; | |
285 | else if (nlbufsiz > 131072) | |
286 | status = -ERANGE; | |
287 | else { | |
288 | inst->nlbufsiz = nlbufsiz; | |
289 | status = 0; | |
290 | } | |
291 | spin_unlock_bh(&inst->lock); | |
292 | ||
293 | return status; | |
294 | } | |
295 | ||
23509fcd | 296 | static void |
0597f268 HW |
297 | nfulnl_set_timeout(struct nfulnl_instance *inst, u_int32_t timeout) |
298 | { | |
299 | spin_lock_bh(&inst->lock); | |
300 | inst->flushtimeout = timeout; | |
301 | spin_unlock_bh(&inst->lock); | |
0597f268 HW |
302 | } |
303 | ||
23509fcd | 304 | static void |
0597f268 HW |
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); | |
0597f268 HW |
310 | } |
311 | ||
0af5f6c1 HW |
312 | static int |
313 | nfulnl_set_flags(struct nfulnl_instance *inst, u_int16_t flags) | |
314 | { | |
315 | spin_lock_bh(&inst->lock); | |
ee433530 | 316 | inst->flags = flags; |
0af5f6c1 HW |
317 | spin_unlock_bh(&inst->lock); |
318 | ||
319 | return 0; | |
320 | } | |
321 | ||
c6a8f648 | 322 | static struct sk_buff * |
afff14f6 G |
323 | nfulnl_alloc_skb(struct net *net, u32 peer_portid, unsigned int inst_size, |
324 | unsigned int pkt_size) | |
0597f268 HW |
325 | { |
326 | struct sk_buff *skb; | |
ad2ad0f9 | 327 | unsigned int n; |
0597f268 | 328 | |
0597f268 HW |
329 | /* alloc skb which should be big enough for a whole multipart |
330 | * message. WARNING: has to be <= 128k due to slab restrictions */ | |
331 | ||
ad2ad0f9 | 332 | n = max(inst_size, pkt_size); |
905f0a73 | 333 | skb = alloc_skb(n, GFP_ATOMIC); |
0597f268 | 334 | if (!skb) { |
ad2ad0f9 PM |
335 | if (n > pkt_size) { |
336 | /* try to allocate only as much as we need for current | |
337 | * packet */ | |
0597f268 | 338 | |
905f0a73 | 339 | skb = alloc_skb(pkt_size, GFP_ATOMIC); |
ad2ad0f9 | 340 | } |
0597f268 HW |
341 | } |
342 | ||
343 | return skb; | |
344 | } | |
345 | ||
b51d3fa3 | 346 | static void |
0597f268 HW |
347 | __nfulnl_send(struct nfulnl_instance *inst) |
348 | { | |
d550d095 DM |
349 | if (inst->qlen > 1) { |
350 | struct nlmsghdr *nlh = nlmsg_put(inst->skb, 0, 0, | |
351 | NLMSG_DONE, | |
352 | sizeof(struct nfgenmsg), | |
353 | 0); | |
b51d3fa3 HL |
354 | if (WARN_ONCE(!nlh, "bad nlskb size: %u, tailroom %d\n", |
355 | inst->skb->len, skb_tailroom(inst->skb))) { | |
356 | kfree_skb(inst->skb); | |
d550d095 | 357 | goto out; |
b51d3fa3 | 358 | } |
d550d095 | 359 | } |
b51d3fa3 HL |
360 | nfnetlink_unicast(inst->skb, inst->net, inst->peer_portid, |
361 | MSG_DONTWAIT); | |
362 | out: | |
0597f268 HW |
363 | inst->qlen = 0; |
364 | inst->skb = NULL; | |
0597f268 HW |
365 | } |
366 | ||
e3567061 MM |
367 | static void |
368 | __nfulnl_flush(struct nfulnl_instance *inst) | |
369 | { | |
370 | /* timer holds a reference */ | |
371 | if (del_timer(&inst->timer)) | |
372 | instance_put(inst); | |
373 | if (inst->skb) | |
374 | __nfulnl_send(inst); | |
375 | } | |
376 | ||
c6a8f648 MM |
377 | static void |
378 | nfulnl_timer(unsigned long data) | |
0597f268 | 379 | { |
601e68e1 | 380 | struct nfulnl_instance *inst = (struct nfulnl_instance *)data; |
0597f268 | 381 | |
0597f268 | 382 | spin_lock_bh(&inst->lock); |
370e6a87 MM |
383 | if (inst->skb) |
384 | __nfulnl_send(inst); | |
0597f268 | 385 | spin_unlock_bh(&inst->lock); |
05f7b7b3 | 386 | instance_put(inst); |
0597f268 HW |
387 | } |
388 | ||
0af5f6c1 HW |
389 | /* This is an inline function, we don't really care about a long |
390 | * list of arguments */ | |
601e68e1 | 391 | static inline int |
9368a53c G |
392 | __build_packet_message(struct nfnl_log_net *log, |
393 | struct nfulnl_instance *inst, | |
601e68e1 | 394 | const struct sk_buff *skb, |
0597f268 | 395 | unsigned int data_len, |
76108cea | 396 | u_int8_t pf, |
0597f268 HW |
397 | unsigned int hooknum, |
398 | const struct net_device *indev, | |
399 | const struct net_device *outdev, | |
a29a9a58 KM |
400 | const char *prefix, unsigned int plen, |
401 | const struct nfnl_ct_hook *nfnl_ct, | |
402 | struct nf_conn *ct, enum ip_conntrack_info ctinfo) | |
0597f268 | 403 | { |
0597f268 HW |
404 | struct nfulnl_msg_packet_hdr pmsg; |
405 | struct nlmsghdr *nlh; | |
406 | struct nfgenmsg *nfmsg; | |
27a884dc | 407 | sk_buff_data_t old_tail = inst->skb->tail; |
0626af31 | 408 | struct sock *sk; |
0c36b48b | 409 | const unsigned char *hwhdrp; |
0597f268 | 410 | |
d550d095 | 411 | nlh = nlmsg_put(inst->skb, 0, 0, |
0597f268 | 412 | NFNL_SUBSYS_ULOG << 8 | NFULNL_MSG_PACKET, |
d550d095 DM |
413 | sizeof(struct nfgenmsg), 0); |
414 | if (!nlh) | |
415 | return -1; | |
416 | nfmsg = nlmsg_data(nlh); | |
0597f268 HW |
417 | nfmsg->nfgen_family = pf; |
418 | nfmsg->version = NFNETLINK_V0; | |
419 | nfmsg->res_id = htons(inst->group_num); | |
420 | ||
e4d091d7 | 421 | memset(&pmsg, 0, sizeof(pmsg)); |
febf0a43 | 422 | pmsg.hw_protocol = skb->protocol; |
0597f268 HW |
423 | pmsg.hook = hooknum; |
424 | ||
1db20a52 DM |
425 | if (nla_put(inst->skb, NFULA_PACKET_HDR, sizeof(pmsg), &pmsg)) |
426 | goto nla_put_failure; | |
0597f268 | 427 | |
1db20a52 DM |
428 | if (prefix && |
429 | nla_put(inst->skb, NFULA_PREFIX, plen, prefix)) | |
430 | goto nla_put_failure; | |
0597f268 HW |
431 | |
432 | if (indev) { | |
1109a90c | 433 | #if !IS_ENABLED(CONFIG_BRIDGE_NETFILTER) |
1db20a52 DM |
434 | if (nla_put_be32(inst->skb, NFULA_IFINDEX_INDEV, |
435 | htonl(indev->ifindex))) | |
436 | goto nla_put_failure; | |
fbcd923c HW |
437 | #else |
438 | if (pf == PF_BRIDGE) { | |
439 | /* Case 1: outdev is physical input device, we need to | |
440 | * look for bridge group (when called from | |
441 | * netfilter_bridge) */ | |
1db20a52 DM |
442 | if (nla_put_be32(inst->skb, NFULA_IFINDEX_PHYSINDEV, |
443 | htonl(indev->ifindex)) || | |
fbcd923c | 444 | /* this is the bridge group "brX" */ |
f350a0a8 | 445 | /* rcu_read_lock()ed by nf_hook_slow or nf_log_packet */ |
1db20a52 DM |
446 | nla_put_be32(inst->skb, NFULA_IFINDEX_INDEV, |
447 | htonl(br_port_get_rcu(indev)->br->dev->ifindex))) | |
448 | goto nla_put_failure; | |
fbcd923c | 449 | } else { |
c737b7c4 FW |
450 | struct net_device *physindev; |
451 | ||
fbcd923c HW |
452 | /* Case 2: indev is bridge group, we need to look for |
453 | * physical device (when called from ipv4) */ | |
1db20a52 DM |
454 | if (nla_put_be32(inst->skb, NFULA_IFINDEX_INDEV, |
455 | htonl(indev->ifindex))) | |
456 | goto nla_put_failure; | |
c737b7c4 FW |
457 | |
458 | physindev = nf_bridge_get_physindev(skb); | |
459 | if (physindev && | |
1db20a52 | 460 | nla_put_be32(inst->skb, NFULA_IFINDEX_PHYSINDEV, |
c737b7c4 | 461 | htonl(physindev->ifindex))) |
1db20a52 | 462 | goto nla_put_failure; |
fbcd923c HW |
463 | } |
464 | #endif | |
0597f268 HW |
465 | } |
466 | ||
467 | if (outdev) { | |
1109a90c | 468 | #if !IS_ENABLED(CONFIG_BRIDGE_NETFILTER) |
1db20a52 DM |
469 | if (nla_put_be32(inst->skb, NFULA_IFINDEX_OUTDEV, |
470 | htonl(outdev->ifindex))) | |
471 | goto nla_put_failure; | |
fbcd923c HW |
472 | #else |
473 | if (pf == PF_BRIDGE) { | |
474 | /* Case 1: outdev is physical output device, we need to | |
475 | * look for bridge group (when called from | |
476 | * netfilter_bridge) */ | |
1db20a52 DM |
477 | if (nla_put_be32(inst->skb, NFULA_IFINDEX_PHYSOUTDEV, |
478 | htonl(outdev->ifindex)) || | |
fbcd923c | 479 | /* this is the bridge group "brX" */ |
f350a0a8 | 480 | /* rcu_read_lock()ed by nf_hook_slow or nf_log_packet */ |
1db20a52 DM |
481 | nla_put_be32(inst->skb, NFULA_IFINDEX_OUTDEV, |
482 | htonl(br_port_get_rcu(outdev)->br->dev->ifindex))) | |
483 | goto nla_put_failure; | |
fbcd923c | 484 | } else { |
c737b7c4 FW |
485 | struct net_device *physoutdev; |
486 | ||
fbcd923c HW |
487 | /* Case 2: indev is a bridge group, we need to look |
488 | * for physical device (when called from ipv4) */ | |
1db20a52 DM |
489 | if (nla_put_be32(inst->skb, NFULA_IFINDEX_OUTDEV, |
490 | htonl(outdev->ifindex))) | |
491 | goto nla_put_failure; | |
c737b7c4 FW |
492 | |
493 | physoutdev = nf_bridge_get_physoutdev(skb); | |
494 | if (physoutdev && | |
1db20a52 | 495 | nla_put_be32(inst->skb, NFULA_IFINDEX_PHYSOUTDEV, |
c737b7c4 | 496 | htonl(physoutdev->ifindex))) |
1db20a52 | 497 | goto nla_put_failure; |
fbcd923c HW |
498 | } |
499 | #endif | |
0597f268 HW |
500 | } |
501 | ||
1db20a52 DM |
502 | if (skb->mark && |
503 | nla_put_be32(inst->skb, NFULA_MARK, htonl(skb->mark))) | |
504 | goto nla_put_failure; | |
0597f268 | 505 | |
2c38de4c NC |
506 | if (indev && skb->dev && |
507 | skb->mac_header != skb->network_header) { | |
0597f268 | 508 | struct nfulnl_msg_packet_hw phw; |
e4d091d7 DC |
509 | int len; |
510 | ||
511 | memset(&phw, 0, sizeof(phw)); | |
512 | len = dev_parse_header(skb, phw.hw_addr); | |
b95cce35 SH |
513 | if (len > 0) { |
514 | phw.hw_addrlen = htons(len); | |
1db20a52 DM |
515 | if (nla_put(inst->skb, NFULA_HWADDR, sizeof(phw), &phw)) |
516 | goto nla_put_failure; | |
b95cce35 | 517 | } |
0597f268 HW |
518 | } |
519 | ||
72961ecf | 520 | if (indev && skb_mac_header_was_set(skb)) { |
2dba62c3 | 521 | if (nla_put_be16(inst->skb, NFULA_HWTYPE, htons(skb->dev->type)) || |
1db20a52 | 522 | nla_put_be16(inst->skb, NFULA_HWLEN, |
0c36b48b BH |
523 | htons(skb->dev->hard_header_len))) |
524 | goto nla_put_failure; | |
525 | ||
526 | hwhdrp = skb_mac_header(skb); | |
527 | ||
528 | if (skb->dev->type == ARPHRD_SIT) | |
529 | hwhdrp -= ETH_HLEN; | |
530 | ||
531 | if (hwhdrp >= skb->head && | |
532 | nla_put(inst->skb, NFULA_HWHEADER, | |
533 | skb->dev->hard_header_len, hwhdrp)) | |
1db20a52 | 534 | goto nla_put_failure; |
72961ecf EL |
535 | } |
536 | ||
b7aa0bf7 | 537 | if (skb->tstamp.tv64) { |
0597f268 | 538 | struct nfulnl_msg_packet_timestamp ts; |
f6389ecb AB |
539 | struct timespec64 kts = ktime_to_timespec64(skb->tstamp); |
540 | ts.sec = cpu_to_be64(kts.tv_sec); | |
541 | ts.usec = cpu_to_be64(kts.tv_nsec / NSEC_PER_USEC); | |
0597f268 | 542 | |
1db20a52 DM |
543 | if (nla_put(inst->skb, NFULA_TIMESTAMP, sizeof(ts), &ts)) |
544 | goto nla_put_failure; | |
0597f268 HW |
545 | } |
546 | ||
547 | /* UID */ | |
0626af31 | 548 | sk = skb->sk; |
a8399231 | 549 | if (sk && sk_fullsock(sk)) { |
0626af31 ED |
550 | read_lock_bh(&sk->sk_callback_lock); |
551 | if (sk->sk_socket && sk->sk_socket->file) { | |
552 | struct file *file = sk->sk_socket->file; | |
437589a7 LT |
553 | const struct cred *cred = file->f_cred; |
554 | struct user_namespace *user_ns = inst->peer_user_ns; | |
555 | __be32 uid = htonl(from_kuid_munged(user_ns, cred->fsuid)); | |
556 | __be32 gid = htonl(from_kgid_munged(user_ns, cred->fsgid)); | |
0626af31 | 557 | read_unlock_bh(&sk->sk_callback_lock); |
1db20a52 DM |
558 | if (nla_put_be32(inst->skb, NFULA_UID, uid) || |
559 | nla_put_be32(inst->skb, NFULA_GID, gid)) | |
560 | goto nla_put_failure; | |
0597f268 | 561 | } else |
0626af31 | 562 | read_unlock_bh(&sk->sk_callback_lock); |
0597f268 HW |
563 | } |
564 | ||
0af5f6c1 | 565 | /* local sequence number */ |
1db20a52 DM |
566 | if ((inst->flags & NFULNL_CFG_F_SEQ) && |
567 | nla_put_be32(inst->skb, NFULA_SEQ, htonl(inst->seq++))) | |
568 | goto nla_put_failure; | |
0dfedd28 | 569 | |
0af5f6c1 | 570 | /* global sequence number */ |
1db20a52 DM |
571 | if ((inst->flags & NFULNL_CFG_F_SEQ_GLOBAL) && |
572 | nla_put_be32(inst->skb, NFULA_SEQ_GLOBAL, | |
9368a53c | 573 | htonl(atomic_inc_return(&log->global_seq)))) |
1db20a52 | 574 | goto nla_put_failure; |
0af5f6c1 | 575 | |
a29a9a58 KM |
576 | if (ct && nfnl_ct->build(inst->skb, ct, ctinfo, |
577 | NFULA_CT, NFULA_CT_INFO) < 0) | |
578 | goto nla_put_failure; | |
579 | ||
0597f268 | 580 | if (data_len) { |
df6fb868 PM |
581 | struct nlattr *nla; |
582 | int size = nla_attr_size(data_len); | |
0597f268 | 583 | |
82251615 PNA |
584 | if (skb_tailroom(inst->skb) < nla_total_size(data_len)) |
585 | goto nla_put_failure; | |
0597f268 | 586 | |
df6fb868 PM |
587 | nla = (struct nlattr *)skb_put(inst->skb, nla_total_size(data_len)); |
588 | nla->nla_type = NFULA_PAYLOAD; | |
589 | nla->nla_len = size; | |
0597f268 | 590 | |
df6fb868 | 591 | if (skb_copy_bits(skb, 0, nla_data(nla), data_len)) |
0597f268 HW |
592 | BUG(); |
593 | } | |
601e68e1 | 594 | |
0597f268 HW |
595 | nlh->nlmsg_len = inst->skb->tail - old_tail; |
596 | return 0; | |
597 | ||
df6fb868 | 598 | nla_put_failure: |
0597f268 HW |
599 | PRINTR(KERN_ERR "nfnetlink_log: error creating log nlmsg\n"); |
600 | return -1; | |
601 | } | |
602 | ||
0597f268 HW |
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 | { | |
a29a9a58 KM |
625 | size_t size; |
626 | unsigned int data_len; | |
0597f268 HW |
627 | struct nfulnl_instance *inst; |
628 | const struct nf_loginfo *li; | |
629 | unsigned int qthreshold; | |
d7a5c324 | 630 | unsigned int plen; |
9368a53c | 631 | struct nfnl_log_net *log = nfnl_log_pernet(net); |
a29a9a58 KM |
632 | const struct nfnl_ct_hook *nfnl_ct = NULL; |
633 | struct nf_conn *ct = NULL; | |
634 | enum ip_conntrack_info uninitialized_var(ctinfo); | |
0597f268 | 635 | |
601e68e1 | 636 | if (li_user && li_user->type == NF_LOG_TYPE_ULOG) |
0597f268 HW |
637 | li = li_user; |
638 | else | |
639 | li = &default_loginfo; | |
640 | ||
9368a53c | 641 | inst = instance_lookup_get(log, li->u.ulog.group); |
0597f268 | 642 | if (!inst) |
0597f268 | 643 | return; |
0597f268 | 644 | |
d7a5c324 PM |
645 | plen = 0; |
646 | if (prefix) | |
881dbfe8 | 647 | plen = strlen(prefix) + 1; |
d7a5c324 | 648 | |
0597f268 HW |
649 | /* FIXME: do we want to make the size calculation conditional based on |
650 | * what is actually present? way more branches and checks, but more | |
651 | * memory efficient... */ | |
573ce260 | 652 | size = nlmsg_total_size(sizeof(struct nfgenmsg)) |
df6fb868 PM |
653 | + nla_total_size(sizeof(struct nfulnl_msg_packet_hdr)) |
654 | + nla_total_size(sizeof(u_int32_t)) /* ifindex */ | |
655 | + nla_total_size(sizeof(u_int32_t)) /* ifindex */ | |
1109a90c | 656 | #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER) |
df6fb868 PM |
657 | + nla_total_size(sizeof(u_int32_t)) /* ifindex */ |
658 | + nla_total_size(sizeof(u_int32_t)) /* ifindex */ | |
fbcd923c | 659 | #endif |
df6fb868 PM |
660 | + nla_total_size(sizeof(u_int32_t)) /* mark */ |
661 | + nla_total_size(sizeof(u_int32_t)) /* uid */ | |
76aa1ce1 | 662 | + nla_total_size(sizeof(u_int32_t)) /* gid */ |
df6fb868 PM |
663 | + nla_total_size(plen) /* prefix */ |
664 | + nla_total_size(sizeof(struct nfulnl_msg_packet_hw)) | |
9dfa1dfe FW |
665 | + nla_total_size(sizeof(struct nfulnl_msg_packet_timestamp)) |
666 | + nla_total_size(sizeof(struct nfgenmsg)); /* NLMSG_DONE */ | |
0597f268 | 667 | |
eeff9bee PNA |
668 | if (in && skb_mac_header_was_set(skb)) { |
669 | size += nla_total_size(skb->dev->hard_header_len) | |
670 | + nla_total_size(sizeof(u_int16_t)) /* hwtype */ | |
671 | + nla_total_size(sizeof(u_int16_t)); /* hwlen */ | |
672 | } | |
673 | ||
0597f268 HW |
674 | spin_lock_bh(&inst->lock); |
675 | ||
0af5f6c1 | 676 | if (inst->flags & NFULNL_CFG_F_SEQ) |
df6fb868 | 677 | size += nla_total_size(sizeof(u_int32_t)); |
0af5f6c1 | 678 | if (inst->flags & NFULNL_CFG_F_SEQ_GLOBAL) |
df6fb868 | 679 | size += nla_total_size(sizeof(u_int32_t)); |
a29a9a58 KM |
680 | if (inst->flags & NFULNL_CFG_F_CONNTRACK) { |
681 | nfnl_ct = rcu_dereference(nfnl_ct_hook); | |
682 | if (nfnl_ct != NULL) { | |
683 | ct = nfnl_ct->get_ct(skb, &ctinfo); | |
684 | if (ct != NULL) | |
685 | size += nfnl_ct->build_size(ct); | |
686 | } | |
687 | } | |
0af5f6c1 | 688 | |
0597f268 HW |
689 | qthreshold = inst->qthreshold; |
690 | /* per-rule qthreshold overrides per-instance */ | |
5ca431f9 EL |
691 | if (li->u.ulog.qthreshold) |
692 | if (qthreshold > li->u.ulog.qthreshold) | |
693 | qthreshold = li->u.ulog.qthreshold; | |
694 | ||
601e68e1 | 695 | |
0597f268 HW |
696 | switch (inst->copy_mode) { |
697 | case NFULNL_COPY_META: | |
698 | case NFULNL_COPY_NONE: | |
699 | data_len = 0; | |
700 | break; | |
601e68e1 | 701 | |
0597f268 | 702 | case NFULNL_COPY_PACKET: |
7643507f VP |
703 | data_len = inst->copy_range; |
704 | if ((li->u.ulog.flags & NF_LOG_F_COPY_LEN) && | |
705 | (li->u.ulog.copy_len < data_len)) | |
706 | data_len = li->u.ulog.copy_len; | |
707 | ||
708 | if (data_len > skb->len) | |
0597f268 | 709 | data_len = skb->len; |
601e68e1 | 710 | |
df6fb868 | 711 | size += nla_total_size(data_len); |
0597f268 | 712 | break; |
601e68e1 | 713 | |
f5c5440d | 714 | case NFULNL_COPY_DISABLED: |
0597f268 | 715 | default: |
55b5a91e | 716 | goto unlock_and_release; |
0597f268 HW |
717 | } |
718 | ||
9dfa1dfe | 719 | if (inst->skb && size > skb_tailroom(inst->skb)) { |
0597f268 HW |
720 | /* either the queue len is too high or we don't have |
721 | * enough room in the skb left. flush to userspace. */ | |
e3567061 | 722 | __nfulnl_flush(inst); |
55b5a91e | 723 | } |
0597f268 | 724 | |
55b5a91e | 725 | if (!inst->skb) { |
afff14f6 G |
726 | inst->skb = nfulnl_alloc_skb(net, inst->peer_portid, |
727 | inst->nlbufsiz, size); | |
55b5a91e | 728 | if (!inst->skb) |
0597f268 | 729 | goto alloc_failure; |
0597f268 HW |
730 | } |
731 | ||
0597f268 HW |
732 | inst->qlen++; |
733 | ||
9368a53c | 734 | __build_packet_message(log, inst, skb, data_len, pf, |
a29a9a58 KM |
735 | hooknum, in, out, prefix, plen, |
736 | nfnl_ct, ct, ctinfo); | |
0597f268 | 737 | |
d63b043d MM |
738 | if (inst->qlen >= qthreshold) |
739 | __nfulnl_flush(inst); | |
0597f268 HW |
740 | /* timer_pending always called within inst->lock, so there |
741 | * is no chance of a race here */ | |
d63b043d | 742 | else if (!timer_pending(&inst->timer)) { |
0597f268 HW |
743 | instance_get(inst); |
744 | inst->timer.expires = jiffies + (inst->flushtimeout*HZ/100); | |
745 | add_timer(&inst->timer); | |
746 | } | |
0597f268 | 747 | |
ed32abea MM |
748 | unlock_and_release: |
749 | spin_unlock_bh(&inst->lock); | |
750 | instance_put(inst); | |
0597f268 HW |
751 | return; |
752 | ||
753 | alloc_failure: | |
0597f268 | 754 | /* FIXME: statistics */ |
ed32abea | 755 | goto unlock_and_release; |
0597f268 | 756 | } |
5f7340ef | 757 | EXPORT_SYMBOL_GPL(nfulnl_log_packet); |
0597f268 HW |
758 | |
759 | static int | |
760 | nfulnl_rcv_nl_event(struct notifier_block *this, | |
761 | unsigned long event, void *ptr) | |
762 | { | |
763 | struct netlink_notify *n = ptr; | |
9368a53c | 764 | struct nfnl_log_net *log = nfnl_log_pernet(n->net); |
0597f268 | 765 | |
dee5817e | 766 | if (event == NETLINK_URELEASE && n->protocol == NETLINK_NETFILTER) { |
0597f268 HW |
767 | int i; |
768 | ||
15e47304 | 769 | /* destroy all instances for this portid */ |
9368a53c | 770 | spin_lock_bh(&log->instances_lock); |
0597f268 | 771 | for (i = 0; i < INSTANCE_BUCKETS; i++) { |
b67bfe0d | 772 | struct hlist_node *t2; |
0597f268 | 773 | struct nfulnl_instance *inst; |
9368a53c | 774 | struct hlist_head *head = &log->instance_table[i]; |
0597f268 | 775 | |
b67bfe0d | 776 | hlist_for_each_entry_safe(inst, t2, head, hlist) { |
9368a53c | 777 | if (n->portid == inst->peer_portid) |
0597f268 HW |
778 | __instance_destroy(inst); |
779 | } | |
780 | } | |
9368a53c | 781 | spin_unlock_bh(&log->instances_lock); |
0597f268 HW |
782 | } |
783 | return NOTIFY_DONE; | |
784 | } | |
785 | ||
786 | static struct notifier_block nfulnl_rtnl_notifier = { | |
787 | .notifier_call = nfulnl_rcv_nl_event, | |
788 | }; | |
789 | ||
7b8002a1 PNA |
790 | static int nfulnl_recv_unsupp(struct net *net, struct sock *ctnl, |
791 | struct sk_buff *skb, const struct nlmsghdr *nlh, | |
792 | const struct nlattr * const nfqa[]) | |
0597f268 HW |
793 | { |
794 | return -ENOTSUPP; | |
795 | } | |
796 | ||
ca735b3a | 797 | static struct nf_logger nfulnl_logger __read_mostly = { |
0597f268 | 798 | .name = "nfnetlink_log", |
5962815a | 799 | .type = NF_LOG_TYPE_ULOG, |
0597f268 HW |
800 | .logfn = &nfulnl_log_packet, |
801 | .me = THIS_MODULE, | |
802 | }; | |
803 | ||
fd8281ad PM |
804 | static const struct nla_policy nfula_cfg_policy[NFULA_CFG_MAX+1] = { |
805 | [NFULA_CFG_CMD] = { .len = sizeof(struct nfulnl_msg_config_cmd) }, | |
806 | [NFULA_CFG_MODE] = { .len = sizeof(struct nfulnl_msg_config_mode) }, | |
807 | [NFULA_CFG_TIMEOUT] = { .type = NLA_U32 }, | |
808 | [NFULA_CFG_QTHRESH] = { .type = NLA_U32 }, | |
809 | [NFULA_CFG_NLBUFSIZ] = { .type = NLA_U32 }, | |
810 | [NFULA_CFG_FLAGS] = { .type = NLA_U16 }, | |
0597f268 HW |
811 | }; |
812 | ||
7b8002a1 PNA |
813 | static int nfulnl_recv_config(struct net *net, struct sock *ctnl, |
814 | struct sk_buff *skb, const struct nlmsghdr *nlh, | |
815 | const struct nlattr * const nfula[]) | |
0597f268 | 816 | { |
d550d095 | 817 | struct nfgenmsg *nfmsg = nlmsg_data(nlh); |
0597f268 HW |
818 | u_int16_t group_num = ntohs(nfmsg->res_id); |
819 | struct nfulnl_instance *inst; | |
b7047a1c | 820 | struct nfulnl_msg_config_cmd *cmd = NULL; |
9368a53c | 821 | struct nfnl_log_net *log = nfnl_log_pernet(net); |
0597f268 | 822 | int ret = 0; |
c872a2d9 | 823 | u16 flags = 0; |
0597f268 | 824 | |
b7047a1c PM |
825 | if (nfula[NFULA_CFG_CMD]) { |
826 | u_int8_t pf = nfmsg->nfgen_family; | |
827 | cmd = nla_data(nfula[NFULA_CFG_CMD]); | |
828 | ||
829 | /* Commands without queue context */ | |
830 | switch (cmd->command) { | |
831 | case NFULNL_CFG_CMD_PF_BIND: | |
30e0c6a6 | 832 | return nf_log_bind_pf(net, pf, &nfulnl_logger); |
b7047a1c | 833 | case NFULNL_CFG_CMD_PF_UNBIND: |
30e0c6a6 | 834 | nf_log_unbind_pf(net, pf); |
b7047a1c PM |
835 | return 0; |
836 | } | |
837 | } | |
838 | ||
9368a53c | 839 | inst = instance_lookup_get(log, group_num); |
15e47304 | 840 | if (inst && inst->peer_portid != NETLINK_CB(skb).portid) { |
c0506365 PM |
841 | ret = -EPERM; |
842 | goto out_put; | |
843 | } | |
844 | ||
8cbc8708 PN |
845 | /* Check if we support these flags in first place, dependencies should |
846 | * be there too not to break atomicity. | |
847 | */ | |
848 | if (nfula[NFULA_CFG_FLAGS]) { | |
849 | flags = ntohs(nla_get_be16(nfula[NFULA_CFG_FLAGS])); | |
850 | ||
851 | if ((flags & NFULNL_CFG_F_CONNTRACK) && | |
852 | !rcu_access_pointer(nfnl_ct_hook)) { | |
853 | #ifdef CONFIG_MODULES | |
854 | nfnl_unlock(NFNL_SUBSYS_ULOG); | |
855 | request_module("ip_conntrack_netlink"); | |
856 | nfnl_lock(NFNL_SUBSYS_ULOG); | |
857 | if (rcu_access_pointer(nfnl_ct_hook)) { | |
858 | ret = -EAGAIN; | |
859 | goto out_put; | |
860 | } | |
861 | #endif | |
862 | ret = -EOPNOTSUPP; | |
863 | goto out_put; | |
864 | } | |
865 | } | |
866 | ||
b7047a1c | 867 | if (cmd != NULL) { |
0597f268 HW |
868 | switch (cmd->command) { |
869 | case NFULNL_CFG_CMD_BIND: | |
870 | if (inst) { | |
871 | ret = -EBUSY; | |
872 | goto out_put; | |
873 | } | |
874 | ||
9368a53c | 875 | inst = instance_create(net, group_num, |
15e47304 | 876 | NETLINK_CB(skb).portid, |
e32123e5 | 877 | sk_user_ns(NETLINK_CB(skb).sk)); |
baab2ce7 PM |
878 | if (IS_ERR(inst)) { |
879 | ret = PTR_ERR(inst); | |
f414c16c | 880 | goto out; |
0597f268 HW |
881 | } |
882 | break; | |
883 | case NFULNL_CFG_CMD_UNBIND: | |
884 | if (!inst) { | |
885 | ret = -ENODEV; | |
f414c16c | 886 | goto out; |
0597f268 HW |
887 | } |
888 | ||
9368a53c | 889 | instance_destroy(log, inst); |
a49c6503 | 890 | goto out_put; |
0597f268 | 891 | default: |
cd21f0ac | 892 | ret = -ENOTSUPP; |
eb075954 | 893 | goto out_put; |
0597f268 | 894 | } |
336a3b3e PNA |
895 | } else if (!inst) { |
896 | ret = -ENODEV; | |
897 | goto out; | |
0597f268 HW |
898 | } |
899 | ||
df6fb868 | 900 | if (nfula[NFULA_CFG_MODE]) { |
336a3b3e PNA |
901 | struct nfulnl_msg_config_mode *params = |
902 | nla_data(nfula[NFULA_CFG_MODE]); | |
0597f268 HW |
903 | |
904 | nfulnl_set_mode(inst, params->copy_mode, | |
d1208b99 | 905 | ntohl(params->copy_range)); |
0597f268 HW |
906 | } |
907 | ||
df6fb868 | 908 | if (nfula[NFULA_CFG_TIMEOUT]) { |
0dfedd28 | 909 | __be32 timeout = nla_get_be32(nfula[NFULA_CFG_TIMEOUT]); |
0597f268 HW |
910 | |
911 | nfulnl_set_timeout(inst, ntohl(timeout)); | |
912 | } | |
913 | ||
df6fb868 | 914 | if (nfula[NFULA_CFG_NLBUFSIZ]) { |
0dfedd28 | 915 | __be32 nlbufsiz = nla_get_be32(nfula[NFULA_CFG_NLBUFSIZ]); |
0597f268 HW |
916 | |
917 | nfulnl_set_nlbufsiz(inst, ntohl(nlbufsiz)); | |
918 | } | |
919 | ||
df6fb868 | 920 | if (nfula[NFULA_CFG_QTHRESH]) { |
0dfedd28 | 921 | __be32 qthresh = nla_get_be32(nfula[NFULA_CFG_QTHRESH]); |
0597f268 HW |
922 | |
923 | nfulnl_set_qthresh(inst, ntohl(qthresh)); | |
924 | } | |
925 | ||
8cbc8708 | 926 | if (nfula[NFULA_CFG_FLAGS]) |
a29a9a58 | 927 | nfulnl_set_flags(inst, flags); |
0af5f6c1 | 928 | |
0597f268 HW |
929 | out_put: |
930 | instance_put(inst); | |
dd16704e | 931 | out: |
0597f268 HW |
932 | return ret; |
933 | } | |
934 | ||
7c8d4cb4 | 935 | static const struct nfnl_callback nfulnl_cb[NFULNL_MSG_MAX] = { |
0597f268 | 936 | [NFULNL_MSG_PACKET] = { .call = nfulnl_recv_unsupp, |
37d2e7a2 | 937 | .attr_count = NFULA_MAX, }, |
0597f268 | 938 | [NFULNL_MSG_CONFIG] = { .call = nfulnl_recv_config, |
fd8281ad PM |
939 | .attr_count = NFULA_CFG_MAX, |
940 | .policy = nfula_cfg_policy }, | |
0597f268 HW |
941 | }; |
942 | ||
7c8d4cb4 | 943 | static const struct nfnetlink_subsystem nfulnl_subsys = { |
0597f268 HW |
944 | .name = "log", |
945 | .subsys_id = NFNL_SUBSYS_ULOG, | |
946 | .cb_count = NFULNL_MSG_MAX, | |
0597f268 HW |
947 | .cb = nfulnl_cb, |
948 | }; | |
949 | ||
950 | #ifdef CONFIG_PROC_FS | |
951 | struct iter_state { | |
9368a53c | 952 | struct seq_net_private p; |
0597f268 HW |
953 | unsigned int bucket; |
954 | }; | |
955 | ||
9368a53c | 956 | static struct hlist_node *get_first(struct net *net, struct iter_state *st) |
0597f268 | 957 | { |
9368a53c | 958 | struct nfnl_log_net *log; |
0597f268 HW |
959 | if (!st) |
960 | return NULL; | |
961 | ||
9368a53c G |
962 | log = nfnl_log_pernet(net); |
963 | ||
0597f268 | 964 | for (st->bucket = 0; st->bucket < INSTANCE_BUCKETS; st->bucket++) { |
9368a53c G |
965 | struct hlist_head *head = &log->instance_table[st->bucket]; |
966 | ||
967 | if (!hlist_empty(head)) | |
968 | return rcu_dereference_bh(hlist_first_rcu(head)); | |
0597f268 HW |
969 | } |
970 | return NULL; | |
971 | } | |
972 | ||
9368a53c G |
973 | static struct hlist_node *get_next(struct net *net, struct iter_state *st, |
974 | struct hlist_node *h) | |
0597f268 | 975 | { |
0e60ebe0 | 976 | h = rcu_dereference_bh(hlist_next_rcu(h)); |
0597f268 | 977 | while (!h) { |
9368a53c G |
978 | struct nfnl_log_net *log; |
979 | struct hlist_head *head; | |
980 | ||
0597f268 HW |
981 | if (++st->bucket >= INSTANCE_BUCKETS) |
982 | return NULL; | |
983 | ||
9368a53c G |
984 | log = nfnl_log_pernet(net); |
985 | head = &log->instance_table[st->bucket]; | |
986 | h = rcu_dereference_bh(hlist_first_rcu(head)); | |
0597f268 HW |
987 | } |
988 | return h; | |
989 | } | |
990 | ||
9368a53c G |
991 | static struct hlist_node *get_idx(struct net *net, struct iter_state *st, |
992 | loff_t pos) | |
0597f268 HW |
993 | { |
994 | struct hlist_node *head; | |
9368a53c | 995 | head = get_first(net, st); |
0597f268 HW |
996 | |
997 | if (head) | |
9368a53c | 998 | while (pos && (head = get_next(net, st, head))) |
0597f268 HW |
999 | pos--; |
1000 | return pos ? NULL : head; | |
1001 | } | |
1002 | ||
9368a53c | 1003 | static void *seq_start(struct seq_file *s, loff_t *pos) |
bed1be20 | 1004 | __acquires(rcu_bh) |
0597f268 | 1005 | { |
bed1be20 | 1006 | rcu_read_lock_bh(); |
9368a53c | 1007 | return get_idx(seq_file_net(s), s->private, *pos); |
0597f268 HW |
1008 | } |
1009 | ||
1010 | static void *seq_next(struct seq_file *s, void *v, loff_t *pos) | |
1011 | { | |
1012 | (*pos)++; | |
9368a53c | 1013 | return get_next(seq_file_net(s), s->private, v); |
0597f268 HW |
1014 | } |
1015 | ||
1016 | static void seq_stop(struct seq_file *s, void *v) | |
bed1be20 | 1017 | __releases(rcu_bh) |
0597f268 | 1018 | { |
bed1be20 | 1019 | rcu_read_unlock_bh(); |
0597f268 HW |
1020 | } |
1021 | ||
1022 | static int seq_show(struct seq_file *s, void *v) | |
1023 | { | |
1024 | const struct nfulnl_instance *inst = v; | |
1025 | ||
20a1d165 | 1026 | seq_printf(s, "%5u %6u %5u %1u %5u %6u %2u\n", |
1ca9e417 JP |
1027 | inst->group_num, |
1028 | inst->peer_portid, inst->qlen, | |
1029 | inst->copy_mode, inst->copy_range, | |
1030 | inst->flushtimeout, atomic_read(&inst->use)); | |
1031 | ||
1032 | return 0; | |
0597f268 HW |
1033 | } |
1034 | ||
56b3d975 | 1035 | static const struct seq_operations nful_seq_ops = { |
0597f268 HW |
1036 | .start = seq_start, |
1037 | .next = seq_next, | |
1038 | .stop = seq_stop, | |
1039 | .show = seq_show, | |
1040 | }; | |
1041 | ||
1042 | static int nful_open(struct inode *inode, struct file *file) | |
1043 | { | |
9368a53c G |
1044 | return seq_open_net(inode, file, &nful_seq_ops, |
1045 | sizeof(struct iter_state)); | |
0597f268 HW |
1046 | } |
1047 | ||
da7071d7 | 1048 | static const struct file_operations nful_file_ops = { |
0597f268 HW |
1049 | .owner = THIS_MODULE, |
1050 | .open = nful_open, | |
1051 | .read = seq_read, | |
1052 | .llseek = seq_lseek, | |
9368a53c | 1053 | .release = seq_release_net, |
0597f268 HW |
1054 | }; |
1055 | ||
1056 | #endif /* PROC_FS */ | |
1057 | ||
9368a53c | 1058 | static int __net_init nfnl_log_net_init(struct net *net) |
0597f268 | 1059 | { |
9368a53c G |
1060 | unsigned int i; |
1061 | struct nfnl_log_net *log = nfnl_log_pernet(net); | |
f13f2aee PW |
1062 | #ifdef CONFIG_PROC_FS |
1063 | struct proc_dir_entry *proc; | |
1064 | kuid_t root_uid; | |
1065 | kgid_t root_gid; | |
1066 | #endif | |
601e68e1 | 1067 | |
0597f268 | 1068 | for (i = 0; i < INSTANCE_BUCKETS; i++) |
9368a53c G |
1069 | INIT_HLIST_HEAD(&log->instance_table[i]); |
1070 | spin_lock_init(&log->instances_lock); | |
1071 | ||
1072 | #ifdef CONFIG_PROC_FS | |
f13f2aee PW |
1073 | proc = proc_create("nfnetlink_log", 0440, |
1074 | net->nf.proc_netfilter, &nful_file_ops); | |
1075 | if (!proc) | |
9368a53c | 1076 | return -ENOMEM; |
f13f2aee PW |
1077 | |
1078 | root_uid = make_kuid(net->user_ns, 0); | |
1079 | root_gid = make_kgid(net->user_ns, 0); | |
1080 | if (uid_valid(root_uid) && gid_valid(root_gid)) | |
1081 | proc_set_user(proc, root_uid, root_gid); | |
9368a53c G |
1082 | #endif |
1083 | return 0; | |
1084 | } | |
1085 | ||
1086 | static void __net_exit nfnl_log_net_exit(struct net *net) | |
1087 | { | |
e778f56e | 1088 | #ifdef CONFIG_PROC_FS |
9368a53c | 1089 | remove_proc_entry("nfnetlink_log", net->nf.proc_netfilter); |
e778f56e | 1090 | #endif |
45c2aff6 | 1091 | nf_log_unset(net, &nfulnl_logger); |
9368a53c G |
1092 | } |
1093 | ||
1094 | static struct pernet_operations nfnl_log_net_ops = { | |
1095 | .init = nfnl_log_net_init, | |
1096 | .exit = nfnl_log_net_exit, | |
1097 | .id = &nfnl_log_net_id, | |
1098 | .size = sizeof(struct nfnl_log_net), | |
1099 | }; | |
1100 | ||
1101 | static int __init nfnetlink_log_init(void) | |
1102 | { | |
3bfe0498 FR |
1103 | int status; |
1104 | ||
1105 | status = register_pernet_subsys(&nfnl_log_net_ops); | |
1106 | if (status < 0) { | |
1107 | pr_err("failed to register pernet ops\n"); | |
1108 | goto out; | |
1109 | } | |
601e68e1 | 1110 | |
0597f268 HW |
1111 | netlink_register_notifier(&nfulnl_rtnl_notifier); |
1112 | status = nfnetlink_subsys_register(&nfulnl_subsys); | |
1113 | if (status < 0) { | |
beacd3e8 | 1114 | pr_err("failed to create netlink socket\n"); |
0597f268 HW |
1115 | goto cleanup_netlink_notifier; |
1116 | } | |
1117 | ||
ca735b3a EL |
1118 | status = nf_log_register(NFPROTO_UNSPEC, &nfulnl_logger); |
1119 | if (status < 0) { | |
beacd3e8 | 1120 | pr_err("failed to register logger\n"); |
ca735b3a EL |
1121 | goto cleanup_subsys; |
1122 | } | |
1123 | ||
0597f268 HW |
1124 | return status; |
1125 | ||
0597f268 | 1126 | cleanup_subsys: |
0597f268 HW |
1127 | nfnetlink_subsys_unregister(&nfulnl_subsys); |
1128 | cleanup_netlink_notifier: | |
1129 | netlink_unregister_notifier(&nfulnl_rtnl_notifier); | |
3bfe0498 FR |
1130 | unregister_pernet_subsys(&nfnl_log_net_ops); |
1131 | out: | |
0597f268 HW |
1132 | return status; |
1133 | } | |
1134 | ||
65b4b4e8 | 1135 | static void __exit nfnetlink_log_fini(void) |
0597f268 | 1136 | { |
e92ad99c | 1137 | nf_log_unregister(&nfulnl_logger); |
32292a7f PM |
1138 | nfnetlink_subsys_unregister(&nfulnl_subsys); |
1139 | netlink_unregister_notifier(&nfulnl_rtnl_notifier); | |
3bfe0498 | 1140 | unregister_pernet_subsys(&nfnl_log_net_ops); |
0597f268 HW |
1141 | } |
1142 | ||
1143 | MODULE_DESCRIPTION("netfilter userspace logging"); | |
1144 | MODULE_AUTHOR("Harald Welte <laforge@netfilter.org>"); | |
1145 | MODULE_LICENSE("GPL"); | |
f682faef | 1146 | MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_ULOG); |
fab4085f PNA |
1147 | MODULE_ALIAS_NF_LOGGER(AF_INET, 1); |
1148 | MODULE_ALIAS_NF_LOGGER(AF_INET6, 1); | |
1149 | MODULE_ALIAS_NF_LOGGER(AF_BRIDGE, 1); | |
2497b846 | 1150 | MODULE_ALIAS_NF_LOGGER(3, 1); /* NFPROTO_ARP */ |
0597f268 | 1151 | |
65b4b4e8 AM |
1152 | module_init(nfnetlink_log_init); |
1153 | module_exit(nfnetlink_log_fini); |