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Commit | Line | Data |
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d2912cb1 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
0597f268 HW |
2 | /* |
3 | * This is a module which is used for logging packets to userspace via | |
4 | * nfetlink. | |
5 | * | |
6 | * (C) 2005 by Harald Welte <laforge@netfilter.org> | |
f229f6ce | 7 | * (C) 2006-2012 Patrick McHardy <kaber@trash.net> |
0597f268 HW |
8 | * |
9 | * Based on the old ipv4-only ipt_ULOG.c: | |
10 | * (C) 2000-2004 by Harald Welte <laforge@netfilter.org> | |
0597f268 | 11 | */ |
beacd3e8 ML |
12 | |
13 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt | |
14 | ||
0597f268 HW |
15 | #include <linux/module.h> |
16 | #include <linux/skbuff.h> | |
e035edd1 | 17 | #include <linux/if_arp.h> |
0597f268 HW |
18 | #include <linux/init.h> |
19 | #include <linux/ip.h> | |
20 | #include <linux/ipv6.h> | |
21 | #include <linux/netdevice.h> | |
22 | #include <linux/netfilter.h> | |
c737b7c4 | 23 | #include <linux/netfilter_bridge.h> |
573ce260 | 24 | #include <net/netlink.h> |
0597f268 HW |
25 | #include <linux/netfilter/nfnetlink.h> |
26 | #include <linux/netfilter/nfnetlink_log.h> | |
a29a9a58 | 27 | #include <linux/netfilter/nf_conntrack_common.h> |
0597f268 HW |
28 | #include <linux/spinlock.h> |
29 | #include <linux/sysctl.h> | |
30 | #include <linux/proc_fs.h> | |
31 | #include <linux/security.h> | |
32 | #include <linux/list.h> | |
5a0e3ad6 | 33 | #include <linux/slab.h> |
0597f268 | 34 | #include <net/sock.h> |
f01ffbd6 | 35 | #include <net/netfilter/nf_log.h> |
9368a53c | 36 | #include <net/netns/generic.h> |
0597f268 | 37 | |
60063497 | 38 | #include <linux/atomic.h> |
b54ab92b RE |
39 | #include <linux/refcount.h> |
40 | ||
0597f268 | 41 | |
1109a90c | 42 | #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER) |
fbcd923c HW |
43 | #include "../bridge/br_private.h" |
44 | #endif | |
45 | ||
83ace77f FW |
46 | #if IS_ENABLED(CONFIG_NF_CONNTRACK) |
47 | #include <net/netfilter/nf_conntrack.h> | |
48 | #endif | |
49 | ||
ce20cdf4 | 50 | #define NFULNL_COPY_DISABLED 0xff |
c2db2924 | 51 | #define NFULNL_NLBUFSIZ_DEFAULT NLMSG_GOODSIZE |
2c6764b7 | 52 | #define NFULNL_TIMEOUT_DEFAULT 100 /* every second */ |
0597f268 | 53 | #define NFULNL_QTHRESH_DEFAULT 100 /* 100 packets */ |
c1e7dc91 FW |
54 | /* max packet size is limited by 16-bit struct nfattr nfa_len field */ |
55 | #define NFULNL_COPY_RANGE_MAX (0xFFFF - NLA_HDRLEN) | |
0597f268 HW |
56 | |
57 | #define PRINTR(x, args...) do { if (net_ratelimit()) \ | |
58 | printk(x, ## args); } while (0); | |
59 | ||
0597f268 HW |
60 | struct nfulnl_instance { |
61 | struct hlist_node hlist; /* global list of instances */ | |
62 | spinlock_t lock; | |
b54ab92b | 63 | refcount_t use; /* use count */ |
0597f268 HW |
64 | |
65 | unsigned int qlen; /* number of nlmsgs in skb */ | |
66 | struct sk_buff *skb; /* pre-allocatd skb */ | |
0597f268 | 67 | struct timer_list timer; |
9368a53c | 68 | struct net *net; |
9eea9515 | 69 | struct user_namespace *peer_user_ns; /* User namespace of the peer process */ |
cc6bc448 | 70 | u32 peer_portid; /* PORTID of the peer process */ |
0597f268 HW |
71 | |
72 | /* configurable parameters */ | |
73 | unsigned int flushtimeout; /* timeout until queue flush */ | |
74 | unsigned int nlbufsiz; /* netlink buffer allocation size */ | |
75 | unsigned int qthreshold; /* threshold of the queue */ | |
76 | u_int32_t copy_range; | |
0af5f6c1 | 77 | u_int32_t seq; /* instance-local sequential counter */ |
0597f268 | 78 | u_int16_t group_num; /* number of this queue */ |
0af5f6c1 | 79 | u_int16_t flags; |
601e68e1 | 80 | u_int8_t copy_mode; |
bed1be20 | 81 | struct rcu_head rcu; |
0597f268 HW |
82 | }; |
83 | ||
0597f268 | 84 | #define INSTANCE_BUCKETS 16 |
0597f268 | 85 | |
c7d03a00 | 86 | static unsigned int nfnl_log_net_id __read_mostly; |
9368a53c G |
87 | |
88 | struct nfnl_log_net { | |
89 | spinlock_t instances_lock; | |
90 | struct hlist_head instance_table[INSTANCE_BUCKETS]; | |
91 | atomic_t global_seq; | |
92 | }; | |
93 | ||
94 | static struct nfnl_log_net *nfnl_log_pernet(struct net *net) | |
95 | { | |
96 | return net_generic(net, nfnl_log_net_id); | |
97 | } | |
98 | ||
0597f268 HW |
99 | static inline u_int8_t instance_hashfn(u_int16_t group_num) |
100 | { | |
101 | return ((group_num & 0xff) % INSTANCE_BUCKETS); | |
102 | } | |
103 | ||
104 | static struct nfulnl_instance * | |
9368a53c | 105 | __instance_lookup(struct nfnl_log_net *log, u_int16_t group_num) |
0597f268 HW |
106 | { |
107 | struct hlist_head *head; | |
0597f268 HW |
108 | struct nfulnl_instance *inst; |
109 | ||
9368a53c | 110 | head = &log->instance_table[instance_hashfn(group_num)]; |
b67bfe0d | 111 | hlist_for_each_entry_rcu(inst, head, hlist) { |
0597f268 HW |
112 | if (inst->group_num == group_num) |
113 | return inst; | |
114 | } | |
115 | return NULL; | |
116 | } | |
117 | ||
118 | static inline void | |
119 | instance_get(struct nfulnl_instance *inst) | |
120 | { | |
b54ab92b | 121 | refcount_inc(&inst->use); |
0597f268 HW |
122 | } |
123 | ||
124 | static struct nfulnl_instance * | |
9368a53c | 125 | instance_lookup_get(struct nfnl_log_net *log, u_int16_t group_num) |
0597f268 HW |
126 | { |
127 | struct nfulnl_instance *inst; | |
128 | ||
bed1be20 | 129 | rcu_read_lock_bh(); |
9368a53c | 130 | inst = __instance_lookup(log, group_num); |
b54ab92b | 131 | if (inst && !refcount_inc_not_zero(&inst->use)) |
f5c5440d | 132 | inst = NULL; |
bed1be20 | 133 | rcu_read_unlock_bh(); |
0597f268 HW |
134 | |
135 | return inst; | |
136 | } | |
137 | ||
bed1be20 ED |
138 | static void nfulnl_instance_free_rcu(struct rcu_head *head) |
139 | { | |
9368a53c G |
140 | struct nfulnl_instance *inst = |
141 | container_of(head, struct nfulnl_instance, rcu); | |
142 | ||
143 | put_net(inst->net); | |
144 | kfree(inst); | |
bed1be20 ED |
145 | module_put(THIS_MODULE); |
146 | } | |
147 | ||
0597f268 HW |
148 | static void |
149 | instance_put(struct nfulnl_instance *inst) | |
150 | { | |
b54ab92b | 151 | if (inst && refcount_dec_and_test(&inst->use)) |
c8d1da40 | 152 | call_rcu(&inst->rcu, nfulnl_instance_free_rcu); |
0597f268 HW |
153 | } |
154 | ||
e99e88a9 | 155 | static void nfulnl_timer(struct timer_list *t); |
0597f268 HW |
156 | |
157 | static struct nfulnl_instance * | |
9368a53c | 158 | instance_create(struct net *net, u_int16_t group_num, |
cc6bc448 | 159 | u32 portid, struct user_namespace *user_ns) |
0597f268 HW |
160 | { |
161 | struct nfulnl_instance *inst; | |
9368a53c | 162 | struct nfnl_log_net *log = nfnl_log_pernet(net); |
baab2ce7 | 163 | int err; |
0597f268 | 164 | |
9368a53c G |
165 | spin_lock_bh(&log->instances_lock); |
166 | if (__instance_lookup(log, group_num)) { | |
baab2ce7 | 167 | err = -EEXIST; |
0597f268 HW |
168 | goto out_unlock; |
169 | } | |
170 | ||
10dfdc69 | 171 | inst = kzalloc(sizeof(*inst), GFP_ATOMIC); |
baab2ce7 PM |
172 | if (!inst) { |
173 | err = -ENOMEM; | |
0597f268 | 174 | goto out_unlock; |
baab2ce7 | 175 | } |
0597f268 | 176 | |
aace57e0 MM |
177 | if (!try_module_get(THIS_MODULE)) { |
178 | kfree(inst); | |
baab2ce7 | 179 | err = -EAGAIN; |
aace57e0 MM |
180 | goto out_unlock; |
181 | } | |
182 | ||
0597f268 | 183 | INIT_HLIST_NODE(&inst->hlist); |
181a46a5 | 184 | spin_lock_init(&inst->lock); |
0597f268 | 185 | /* needs to be two, since we _put() after creation */ |
b54ab92b | 186 | refcount_set(&inst->use, 2); |
0597f268 | 187 | |
e99e88a9 | 188 | timer_setup(&inst->timer, nfulnl_timer, 0); |
0597f268 | 189 | |
9368a53c | 190 | inst->net = get_net(net); |
9eea9515 | 191 | inst->peer_user_ns = user_ns; |
15e47304 | 192 | inst->peer_portid = portid; |
0597f268 HW |
193 | inst->group_num = group_num; |
194 | ||
195 | inst->qthreshold = NFULNL_QTHRESH_DEFAULT; | |
196 | inst->flushtimeout = NFULNL_TIMEOUT_DEFAULT; | |
197 | inst->nlbufsiz = NFULNL_NLBUFSIZ_DEFAULT; | |
198 | inst->copy_mode = NFULNL_COPY_PACKET; | |
6b6ec99a | 199 | inst->copy_range = NFULNL_COPY_RANGE_MAX; |
0597f268 | 200 | |
f5c5440d | 201 | hlist_add_head_rcu(&inst->hlist, |
9368a53c G |
202 | &log->instance_table[instance_hashfn(group_num)]); |
203 | ||
0597f268 | 204 | |
9368a53c | 205 | spin_unlock_bh(&log->instances_lock); |
0597f268 HW |
206 | |
207 | return inst; | |
208 | ||
0597f268 | 209 | out_unlock: |
9368a53c | 210 | spin_unlock_bh(&log->instances_lock); |
baab2ce7 | 211 | return ERR_PTR(err); |
0597f268 HW |
212 | } |
213 | ||
e3567061 | 214 | static void __nfulnl_flush(struct nfulnl_instance *inst); |
0597f268 | 215 | |
f5c5440d | 216 | /* called with BH disabled */ |
0597f268 | 217 | static void |
9afdb00c | 218 | __instance_destroy(struct nfulnl_instance *inst) |
0597f268 HW |
219 | { |
220 | /* first pull it out of the global list */ | |
f5c5440d | 221 | hlist_del_rcu(&inst->hlist); |
0597f268 | 222 | |
0597f268 HW |
223 | /* then flush all pending packets from skb */ |
224 | ||
f5c5440d ED |
225 | spin_lock(&inst->lock); |
226 | ||
227 | /* lockless readers wont be able to use us */ | |
228 | inst->copy_mode = NFULNL_COPY_DISABLED; | |
229 | ||
e3567061 MM |
230 | if (inst->skb) |
231 | __nfulnl_flush(inst); | |
f5c5440d | 232 | spin_unlock(&inst->lock); |
0597f268 HW |
233 | |
234 | /* and finally put the refcount */ | |
235 | instance_put(inst); | |
0597f268 HW |
236 | } |
237 | ||
0597f268 | 238 | static inline void |
9368a53c G |
239 | instance_destroy(struct nfnl_log_net *log, |
240 | struct nfulnl_instance *inst) | |
0597f268 | 241 | { |
9368a53c | 242 | spin_lock_bh(&log->instances_lock); |
9afdb00c | 243 | __instance_destroy(inst); |
9368a53c | 244 | spin_unlock_bh(&log->instances_lock); |
0597f268 HW |
245 | } |
246 | ||
247 | static int | |
248 | nfulnl_set_mode(struct nfulnl_instance *inst, u_int8_t mode, | |
249 | unsigned int range) | |
250 | { | |
251 | int status = 0; | |
252 | ||
253 | spin_lock_bh(&inst->lock); | |
601e68e1 | 254 | |
0597f268 HW |
255 | switch (mode) { |
256 | case NFULNL_COPY_NONE: | |
257 | case NFULNL_COPY_META: | |
258 | inst->copy_mode = mode; | |
259 | inst->copy_range = 0; | |
260 | break; | |
601e68e1 | 261 | |
0597f268 HW |
262 | case NFULNL_COPY_PACKET: |
263 | inst->copy_mode = mode; | |
c1e7dc91 FW |
264 | if (range == 0) |
265 | range = NFULNL_COPY_RANGE_MAX; | |
6b6ec99a MM |
266 | inst->copy_range = min_t(unsigned int, |
267 | range, NFULNL_COPY_RANGE_MAX); | |
0597f268 | 268 | break; |
601e68e1 | 269 | |
0597f268 HW |
270 | default: |
271 | status = -EINVAL; | |
272 | break; | |
273 | } | |
274 | ||
275 | spin_unlock_bh(&inst->lock); | |
276 | ||
277 | return status; | |
278 | } | |
279 | ||
280 | static int | |
281 | nfulnl_set_nlbufsiz(struct nfulnl_instance *inst, u_int32_t nlbufsiz) | |
282 | { | |
283 | int status; | |
284 | ||
285 | spin_lock_bh(&inst->lock); | |
286 | if (nlbufsiz < NFULNL_NLBUFSIZ_DEFAULT) | |
287 | status = -ERANGE; | |
288 | else if (nlbufsiz > 131072) | |
289 | status = -ERANGE; | |
290 | else { | |
291 | inst->nlbufsiz = nlbufsiz; | |
292 | status = 0; | |
293 | } | |
294 | spin_unlock_bh(&inst->lock); | |
295 | ||
296 | return status; | |
297 | } | |
298 | ||
23509fcd | 299 | static void |
0597f268 HW |
300 | nfulnl_set_timeout(struct nfulnl_instance *inst, u_int32_t timeout) |
301 | { | |
302 | spin_lock_bh(&inst->lock); | |
303 | inst->flushtimeout = timeout; | |
304 | spin_unlock_bh(&inst->lock); | |
0597f268 HW |
305 | } |
306 | ||
23509fcd | 307 | static void |
0597f268 HW |
308 | nfulnl_set_qthresh(struct nfulnl_instance *inst, u_int32_t qthresh) |
309 | { | |
310 | spin_lock_bh(&inst->lock); | |
311 | inst->qthreshold = qthresh; | |
312 | spin_unlock_bh(&inst->lock); | |
0597f268 HW |
313 | } |
314 | ||
0af5f6c1 HW |
315 | static int |
316 | nfulnl_set_flags(struct nfulnl_instance *inst, u_int16_t flags) | |
317 | { | |
318 | spin_lock_bh(&inst->lock); | |
ee433530 | 319 | inst->flags = flags; |
0af5f6c1 HW |
320 | spin_unlock_bh(&inst->lock); |
321 | ||
322 | return 0; | |
323 | } | |
324 | ||
c6a8f648 | 325 | static struct sk_buff * |
afff14f6 G |
326 | nfulnl_alloc_skb(struct net *net, u32 peer_portid, unsigned int inst_size, |
327 | unsigned int pkt_size) | |
0597f268 HW |
328 | { |
329 | struct sk_buff *skb; | |
ad2ad0f9 | 330 | unsigned int n; |
0597f268 | 331 | |
0597f268 HW |
332 | /* alloc skb which should be big enough for a whole multipart |
333 | * message. WARNING: has to be <= 128k due to slab restrictions */ | |
334 | ||
ad2ad0f9 | 335 | n = max(inst_size, pkt_size); |
0813fbc9 | 336 | skb = alloc_skb(n, GFP_ATOMIC | __GFP_NOWARN); |
0597f268 | 337 | if (!skb) { |
ad2ad0f9 PM |
338 | if (n > pkt_size) { |
339 | /* try to allocate only as much as we need for current | |
340 | * packet */ | |
0597f268 | 341 | |
905f0a73 | 342 | skb = alloc_skb(pkt_size, 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 | } |
ee921183 | 363 | nfnetlink_unicast(inst->skb, inst->net, inst->peer_portid); |
b51d3fa3 | 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 | 379 | static void |
e99e88a9 | 380 | nfulnl_timer(struct timer_list *t) |
0597f268 | 381 | { |
e99e88a9 | 382 | struct nfulnl_instance *inst = from_timer(inst, t, timer); |
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 | ||
65af4a10 MB |
391 | static u32 nfulnl_get_bridge_size(const struct sk_buff *skb) |
392 | { | |
393 | u32 size = 0; | |
394 | ||
395 | if (!skb_mac_header_was_set(skb)) | |
396 | return 0; | |
397 | ||
398 | if (skb_vlan_tag_present(skb)) { | |
399 | size += nla_total_size(0); /* nested */ | |
400 | size += nla_total_size(sizeof(u16)); /* id */ | |
401 | size += nla_total_size(sizeof(u16)); /* tag */ | |
402 | } | |
403 | ||
404 | if (skb->network_header > skb->mac_header) | |
405 | size += nla_total_size(skb->network_header - skb->mac_header); | |
406 | ||
407 | return size; | |
408 | } | |
409 | ||
410 | static int nfulnl_put_bridge(struct nfulnl_instance *inst, const struct sk_buff *skb) | |
411 | { | |
412 | if (!skb_mac_header_was_set(skb)) | |
413 | return 0; | |
414 | ||
415 | if (skb_vlan_tag_present(skb)) { | |
416 | struct nlattr *nest; | |
417 | ||
418 | nest = nla_nest_start(inst->skb, NFULA_VLAN); | |
419 | if (!nest) | |
420 | goto nla_put_failure; | |
421 | ||
422 | if (nla_put_be16(inst->skb, NFULA_VLAN_TCI, htons(skb->vlan_tci)) || | |
423 | nla_put_be16(inst->skb, NFULA_VLAN_PROTO, skb->vlan_proto)) | |
424 | goto nla_put_failure; | |
425 | ||
426 | nla_nest_end(inst->skb, nest); | |
427 | } | |
428 | ||
429 | if (skb->mac_header < skb->network_header) { | |
430 | int len = (int)(skb->network_header - skb->mac_header); | |
431 | ||
432 | if (nla_put(inst->skb, NFULA_L2HDR, len, skb_mac_header(skb))) | |
433 | goto nla_put_failure; | |
434 | } | |
435 | ||
436 | return 0; | |
437 | ||
438 | nla_put_failure: | |
439 | return -1; | |
440 | } | |
441 | ||
0af5f6c1 HW |
442 | /* This is an inline function, we don't really care about a long |
443 | * list of arguments */ | |
601e68e1 | 444 | static inline int |
9368a53c G |
445 | __build_packet_message(struct nfnl_log_net *log, |
446 | struct nfulnl_instance *inst, | |
601e68e1 | 447 | const struct sk_buff *skb, |
0597f268 | 448 | unsigned int data_len, |
76108cea | 449 | u_int8_t pf, |
0597f268 HW |
450 | unsigned int hooknum, |
451 | const struct net_device *indev, | |
452 | const struct net_device *outdev, | |
a29a9a58 KM |
453 | const char *prefix, unsigned int plen, |
454 | const struct nfnl_ct_hook *nfnl_ct, | |
455 | struct nf_conn *ct, enum ip_conntrack_info ctinfo) | |
0597f268 | 456 | { |
0597f268 HW |
457 | struct nfulnl_msg_packet_hdr pmsg; |
458 | struct nlmsghdr *nlh; | |
27a884dc | 459 | sk_buff_data_t old_tail = inst->skb->tail; |
0626af31 | 460 | struct sock *sk; |
0c36b48b | 461 | const unsigned char *hwhdrp; |
0597f268 | 462 | |
19c28b13 PNA |
463 | nlh = nfnl_msg_put(inst->skb, 0, 0, |
464 | nfnl_msg_type(NFNL_SUBSYS_ULOG, NFULNL_MSG_PACKET), | |
465 | 0, pf, NFNETLINK_V0, htons(inst->group_num)); | |
d550d095 DM |
466 | if (!nlh) |
467 | return -1; | |
0597f268 | 468 | |
e4d091d7 | 469 | memset(&pmsg, 0, sizeof(pmsg)); |
febf0a43 | 470 | pmsg.hw_protocol = skb->protocol; |
0597f268 HW |
471 | pmsg.hook = hooknum; |
472 | ||
1db20a52 DM |
473 | if (nla_put(inst->skb, NFULA_PACKET_HDR, sizeof(pmsg), &pmsg)) |
474 | goto nla_put_failure; | |
0597f268 | 475 | |
1db20a52 DM |
476 | if (prefix && |
477 | nla_put(inst->skb, NFULA_PREFIX, plen, prefix)) | |
478 | goto nla_put_failure; | |
0597f268 HW |
479 | |
480 | if (indev) { | |
1109a90c | 481 | #if !IS_ENABLED(CONFIG_BRIDGE_NETFILTER) |
1db20a52 DM |
482 | if (nla_put_be32(inst->skb, NFULA_IFINDEX_INDEV, |
483 | htonl(indev->ifindex))) | |
484 | goto nla_put_failure; | |
fbcd923c HW |
485 | #else |
486 | if (pf == PF_BRIDGE) { | |
487 | /* Case 1: outdev is physical input device, we need to | |
488 | * look for bridge group (when called from | |
489 | * netfilter_bridge) */ | |
1db20a52 DM |
490 | if (nla_put_be32(inst->skb, NFULA_IFINDEX_PHYSINDEV, |
491 | htonl(indev->ifindex)) || | |
fbcd923c | 492 | /* this is the bridge group "brX" */ |
e2361cb9 AC |
493 | /* rcu_read_lock()ed by nf_hook_thresh or |
494 | * nf_log_packet. | |
495 | */ | |
1db20a52 DM |
496 | nla_put_be32(inst->skb, NFULA_IFINDEX_INDEV, |
497 | htonl(br_port_get_rcu(indev)->br->dev->ifindex))) | |
498 | goto nla_put_failure; | |
fbcd923c | 499 | } else { |
c737b7c4 FW |
500 | struct net_device *physindev; |
501 | ||
fbcd923c HW |
502 | /* Case 2: indev is bridge group, we need to look for |
503 | * physical device (when called from ipv4) */ | |
1db20a52 DM |
504 | if (nla_put_be32(inst->skb, NFULA_IFINDEX_INDEV, |
505 | htonl(indev->ifindex))) | |
506 | goto nla_put_failure; | |
c737b7c4 FW |
507 | |
508 | physindev = nf_bridge_get_physindev(skb); | |
509 | if (physindev && | |
1db20a52 | 510 | nla_put_be32(inst->skb, NFULA_IFINDEX_PHYSINDEV, |
c737b7c4 | 511 | htonl(physindev->ifindex))) |
1db20a52 | 512 | goto nla_put_failure; |
fbcd923c HW |
513 | } |
514 | #endif | |
0597f268 HW |
515 | } |
516 | ||
517 | if (outdev) { | |
1109a90c | 518 | #if !IS_ENABLED(CONFIG_BRIDGE_NETFILTER) |
1db20a52 DM |
519 | if (nla_put_be32(inst->skb, NFULA_IFINDEX_OUTDEV, |
520 | htonl(outdev->ifindex))) | |
521 | goto nla_put_failure; | |
fbcd923c HW |
522 | #else |
523 | if (pf == PF_BRIDGE) { | |
524 | /* Case 1: outdev is physical output device, we need to | |
525 | * look for bridge group (when called from | |
526 | * netfilter_bridge) */ | |
1db20a52 DM |
527 | if (nla_put_be32(inst->skb, NFULA_IFINDEX_PHYSOUTDEV, |
528 | htonl(outdev->ifindex)) || | |
fbcd923c | 529 | /* this is the bridge group "brX" */ |
e2361cb9 AC |
530 | /* rcu_read_lock()ed by nf_hook_thresh or |
531 | * nf_log_packet. | |
532 | */ | |
1db20a52 DM |
533 | nla_put_be32(inst->skb, NFULA_IFINDEX_OUTDEV, |
534 | htonl(br_port_get_rcu(outdev)->br->dev->ifindex))) | |
535 | goto nla_put_failure; | |
fbcd923c | 536 | } else { |
c737b7c4 FW |
537 | struct net_device *physoutdev; |
538 | ||
fbcd923c HW |
539 | /* Case 2: indev is a bridge group, we need to look |
540 | * for physical device (when called from ipv4) */ | |
1db20a52 DM |
541 | if (nla_put_be32(inst->skb, NFULA_IFINDEX_OUTDEV, |
542 | htonl(outdev->ifindex))) | |
543 | goto nla_put_failure; | |
c737b7c4 FW |
544 | |
545 | physoutdev = nf_bridge_get_physoutdev(skb); | |
546 | if (physoutdev && | |
1db20a52 | 547 | nla_put_be32(inst->skb, NFULA_IFINDEX_PHYSOUTDEV, |
c737b7c4 | 548 | htonl(physoutdev->ifindex))) |
1db20a52 | 549 | goto nla_put_failure; |
fbcd923c HW |
550 | } |
551 | #endif | |
0597f268 HW |
552 | } |
553 | ||
1db20a52 DM |
554 | if (skb->mark && |
555 | nla_put_be32(inst->skb, NFULA_MARK, htonl(skb->mark))) | |
556 | goto nla_put_failure; | |
0597f268 | 557 | |
2c38de4c NC |
558 | if (indev && skb->dev && |
559 | skb->mac_header != skb->network_header) { | |
0597f268 | 560 | struct nfulnl_msg_packet_hw phw; |
e4d091d7 DC |
561 | int len; |
562 | ||
563 | memset(&phw, 0, sizeof(phw)); | |
564 | len = dev_parse_header(skb, phw.hw_addr); | |
b95cce35 SH |
565 | if (len > 0) { |
566 | phw.hw_addrlen = htons(len); | |
1db20a52 DM |
567 | if (nla_put(inst->skb, NFULA_HWADDR, sizeof(phw), &phw)) |
568 | goto nla_put_failure; | |
b95cce35 | 569 | } |
0597f268 HW |
570 | } |
571 | ||
72961ecf | 572 | if (indev && skb_mac_header_was_set(skb)) { |
2dba62c3 | 573 | if (nla_put_be16(inst->skb, NFULA_HWTYPE, htons(skb->dev->type)) || |
1db20a52 | 574 | nla_put_be16(inst->skb, NFULA_HWLEN, |
0c36b48b BH |
575 | htons(skb->dev->hard_header_len))) |
576 | goto nla_put_failure; | |
577 | ||
578 | hwhdrp = skb_mac_header(skb); | |
579 | ||
580 | if (skb->dev->type == ARPHRD_SIT) | |
581 | hwhdrp -= ETH_HLEN; | |
582 | ||
583 | if (hwhdrp >= skb->head && | |
584 | nla_put(inst->skb, NFULA_HWHEADER, | |
585 | skb->dev->hard_header_len, hwhdrp)) | |
1db20a52 | 586 | goto nla_put_failure; |
72961ecf EL |
587 | } |
588 | ||
916f6efa | 589 | if (hooknum <= NF_INET_FORWARD && skb->tstamp) { |
0597f268 | 590 | struct nfulnl_msg_packet_timestamp ts; |
f6389ecb AB |
591 | struct timespec64 kts = ktime_to_timespec64(skb->tstamp); |
592 | ts.sec = cpu_to_be64(kts.tv_sec); | |
593 | ts.usec = cpu_to_be64(kts.tv_nsec / NSEC_PER_USEC); | |
0597f268 | 594 | |
1db20a52 DM |
595 | if (nla_put(inst->skb, NFULA_TIMESTAMP, sizeof(ts), &ts)) |
596 | goto nla_put_failure; | |
0597f268 HW |
597 | } |
598 | ||
599 | /* UID */ | |
0626af31 | 600 | sk = skb->sk; |
a8399231 | 601 | if (sk && sk_fullsock(sk)) { |
0626af31 ED |
602 | read_lock_bh(&sk->sk_callback_lock); |
603 | if (sk->sk_socket && sk->sk_socket->file) { | |
604 | struct file *file = sk->sk_socket->file; | |
437589a7 LT |
605 | const struct cred *cred = file->f_cred; |
606 | struct user_namespace *user_ns = inst->peer_user_ns; | |
607 | __be32 uid = htonl(from_kuid_munged(user_ns, cred->fsuid)); | |
608 | __be32 gid = htonl(from_kgid_munged(user_ns, cred->fsgid)); | |
0626af31 | 609 | read_unlock_bh(&sk->sk_callback_lock); |
1db20a52 DM |
610 | if (nla_put_be32(inst->skb, NFULA_UID, uid) || |
611 | nla_put_be32(inst->skb, NFULA_GID, gid)) | |
612 | goto nla_put_failure; | |
0597f268 | 613 | } else |
0626af31 | 614 | read_unlock_bh(&sk->sk_callback_lock); |
0597f268 HW |
615 | } |
616 | ||
0af5f6c1 | 617 | /* local sequence number */ |
1db20a52 DM |
618 | if ((inst->flags & NFULNL_CFG_F_SEQ) && |
619 | nla_put_be32(inst->skb, NFULA_SEQ, htonl(inst->seq++))) | |
620 | goto nla_put_failure; | |
0dfedd28 | 621 | |
0af5f6c1 | 622 | /* global sequence number */ |
1db20a52 DM |
623 | if ((inst->flags & NFULNL_CFG_F_SEQ_GLOBAL) && |
624 | nla_put_be32(inst->skb, NFULA_SEQ_GLOBAL, | |
9368a53c | 625 | htonl(atomic_inc_return(&log->global_seq)))) |
1db20a52 | 626 | goto nla_put_failure; |
0af5f6c1 | 627 | |
a29a9a58 KM |
628 | if (ct && nfnl_ct->build(inst->skb, ct, ctinfo, |
629 | NFULA_CT, NFULA_CT_INFO) < 0) | |
630 | goto nla_put_failure; | |
631 | ||
65af4a10 MB |
632 | if ((pf == NFPROTO_NETDEV || pf == NFPROTO_BRIDGE) && |
633 | nfulnl_put_bridge(inst, skb) < 0) | |
634 | goto nla_put_failure; | |
635 | ||
0597f268 | 636 | if (data_len) { |
df6fb868 PM |
637 | struct nlattr *nla; |
638 | int size = nla_attr_size(data_len); | |
0597f268 | 639 | |
82251615 PNA |
640 | if (skb_tailroom(inst->skb) < nla_total_size(data_len)) |
641 | goto nla_put_failure; | |
0597f268 | 642 | |
4df864c1 | 643 | nla = skb_put(inst->skb, nla_total_size(data_len)); |
df6fb868 PM |
644 | nla->nla_type = NFULA_PAYLOAD; |
645 | nla->nla_len = size; | |
0597f268 | 646 | |
df6fb868 | 647 | if (skb_copy_bits(skb, 0, nla_data(nla), data_len)) |
0597f268 HW |
648 | BUG(); |
649 | } | |
601e68e1 | 650 | |
0597f268 HW |
651 | nlh->nlmsg_len = inst->skb->tail - old_tail; |
652 | return 0; | |
653 | ||
df6fb868 | 654 | nla_put_failure: |
0597f268 HW |
655 | PRINTR(KERN_ERR "nfnetlink_log: error creating log nlmsg\n"); |
656 | return -1; | |
657 | } | |
658 | ||
549d2d41 | 659 | static const struct nf_loginfo default_loginfo = { |
0597f268 HW |
660 | .type = NF_LOG_TYPE_ULOG, |
661 | .u = { | |
662 | .ulog = { | |
663 | .copy_len = 0xffff, | |
664 | .group = 0, | |
665 | .qthreshold = 1, | |
666 | }, | |
667 | }, | |
668 | }; | |
669 | ||
670 | /* log handler for internal netfilter logging api */ | |
ce20cdf4 | 671 | static void |
8cdb46da HS |
672 | nfulnl_log_packet(struct net *net, |
673 | u_int8_t pf, | |
0597f268 HW |
674 | unsigned int hooknum, |
675 | const struct sk_buff *skb, | |
676 | const struct net_device *in, | |
677 | const struct net_device *out, | |
678 | const struct nf_loginfo *li_user, | |
679 | const char *prefix) | |
680 | { | |
a29a9a58 KM |
681 | size_t size; |
682 | unsigned int data_len; | |
0597f268 HW |
683 | struct nfulnl_instance *inst; |
684 | const struct nf_loginfo *li; | |
685 | unsigned int qthreshold; | |
ce20cdf4 | 686 | unsigned int plen = 0; |
9368a53c | 687 | struct nfnl_log_net *log = nfnl_log_pernet(net); |
a29a9a58 KM |
688 | const struct nfnl_ct_hook *nfnl_ct = NULL; |
689 | struct nf_conn *ct = NULL; | |
3f649ab7 | 690 | enum ip_conntrack_info ctinfo; |
0597f268 | 691 | |
601e68e1 | 692 | if (li_user && li_user->type == NF_LOG_TYPE_ULOG) |
0597f268 HW |
693 | li = li_user; |
694 | else | |
695 | li = &default_loginfo; | |
696 | ||
9368a53c | 697 | inst = instance_lookup_get(log, li->u.ulog.group); |
0597f268 | 698 | if (!inst) |
0597f268 | 699 | return; |
0597f268 | 700 | |
d7a5c324 | 701 | if (prefix) |
881dbfe8 | 702 | plen = strlen(prefix) + 1; |
d7a5c324 | 703 | |
0597f268 HW |
704 | /* FIXME: do we want to make the size calculation conditional based on |
705 | * what is actually present? way more branches and checks, but more | |
706 | * memory efficient... */ | |
7e59b3fe | 707 | size = nlmsg_total_size(sizeof(struct nfgenmsg)) |
df6fb868 PM |
708 | + nla_total_size(sizeof(struct nfulnl_msg_packet_hdr)) |
709 | + nla_total_size(sizeof(u_int32_t)) /* ifindex */ | |
710 | + nla_total_size(sizeof(u_int32_t)) /* ifindex */ | |
1109a90c | 711 | #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER) |
df6fb868 PM |
712 | + nla_total_size(sizeof(u_int32_t)) /* ifindex */ |
713 | + nla_total_size(sizeof(u_int32_t)) /* ifindex */ | |
fbcd923c | 714 | #endif |
df6fb868 PM |
715 | + nla_total_size(sizeof(u_int32_t)) /* mark */ |
716 | + nla_total_size(sizeof(u_int32_t)) /* uid */ | |
76aa1ce1 | 717 | + nla_total_size(sizeof(u_int32_t)) /* gid */ |
df6fb868 PM |
718 | + nla_total_size(plen) /* prefix */ |
719 | + nla_total_size(sizeof(struct nfulnl_msg_packet_hw)) | |
9dfa1dfe FW |
720 | + nla_total_size(sizeof(struct nfulnl_msg_packet_timestamp)) |
721 | + nla_total_size(sizeof(struct nfgenmsg)); /* NLMSG_DONE */ | |
0597f268 | 722 | |
eeff9bee | 723 | if (in && skb_mac_header_was_set(skb)) { |
7e59b3fe | 724 | size += nla_total_size(skb->dev->hard_header_len) |
eeff9bee PNA |
725 | + nla_total_size(sizeof(u_int16_t)) /* hwtype */ |
726 | + nla_total_size(sizeof(u_int16_t)); /* hwlen */ | |
727 | } | |
728 | ||
0597f268 HW |
729 | spin_lock_bh(&inst->lock); |
730 | ||
0af5f6c1 | 731 | if (inst->flags & NFULNL_CFG_F_SEQ) |
df6fb868 | 732 | size += nla_total_size(sizeof(u_int32_t)); |
0af5f6c1 | 733 | if (inst->flags & NFULNL_CFG_F_SEQ_GLOBAL) |
df6fb868 | 734 | size += nla_total_size(sizeof(u_int32_t)); |
83ace77f | 735 | #if IS_ENABLED(CONFIG_NF_CONNTRACK) |
a29a9a58 KM |
736 | if (inst->flags & NFULNL_CFG_F_CONNTRACK) { |
737 | nfnl_ct = rcu_dereference(nfnl_ct_hook); | |
738 | if (nfnl_ct != NULL) { | |
83ace77f | 739 | ct = nf_ct_get(skb, &ctinfo); |
a29a9a58 KM |
740 | if (ct != NULL) |
741 | size += nfnl_ct->build_size(ct); | |
742 | } | |
743 | } | |
83ace77f | 744 | #endif |
65af4a10 MB |
745 | if (pf == NFPROTO_NETDEV || pf == NFPROTO_BRIDGE) |
746 | size += nfulnl_get_bridge_size(skb); | |
0af5f6c1 | 747 | |
0597f268 HW |
748 | qthreshold = inst->qthreshold; |
749 | /* per-rule qthreshold overrides per-instance */ | |
5ca431f9 EL |
750 | if (li->u.ulog.qthreshold) |
751 | if (qthreshold > li->u.ulog.qthreshold) | |
752 | qthreshold = li->u.ulog.qthreshold; | |
753 | ||
601e68e1 | 754 | |
0597f268 HW |
755 | switch (inst->copy_mode) { |
756 | case NFULNL_COPY_META: | |
757 | case NFULNL_COPY_NONE: | |
758 | data_len = 0; | |
759 | break; | |
601e68e1 | 760 | |
0597f268 | 761 | case NFULNL_COPY_PACKET: |
7643507f VP |
762 | data_len = inst->copy_range; |
763 | if ((li->u.ulog.flags & NF_LOG_F_COPY_LEN) && | |
764 | (li->u.ulog.copy_len < data_len)) | |
765 | data_len = li->u.ulog.copy_len; | |
766 | ||
767 | if (data_len > skb->len) | |
0597f268 | 768 | data_len = skb->len; |
601e68e1 | 769 | |
df6fb868 | 770 | size += nla_total_size(data_len); |
0597f268 | 771 | break; |
601e68e1 | 772 | |
f5c5440d | 773 | case NFULNL_COPY_DISABLED: |
0597f268 | 774 | default: |
55b5a91e | 775 | goto unlock_and_release; |
0597f268 HW |
776 | } |
777 | ||
9dfa1dfe | 778 | if (inst->skb && size > skb_tailroom(inst->skb)) { |
0597f268 HW |
779 | /* either the queue len is too high or we don't have |
780 | * enough room in the skb left. flush to userspace. */ | |
e3567061 | 781 | __nfulnl_flush(inst); |
55b5a91e | 782 | } |
0597f268 | 783 | |
55b5a91e | 784 | if (!inst->skb) { |
afff14f6 G |
785 | inst->skb = nfulnl_alloc_skb(net, inst->peer_portid, |
786 | inst->nlbufsiz, size); | |
55b5a91e | 787 | if (!inst->skb) |
0597f268 | 788 | goto alloc_failure; |
0597f268 HW |
789 | } |
790 | ||
0597f268 HW |
791 | inst->qlen++; |
792 | ||
9368a53c | 793 | __build_packet_message(log, inst, skb, data_len, pf, |
a29a9a58 KM |
794 | hooknum, in, out, prefix, plen, |
795 | nfnl_ct, ct, ctinfo); | |
0597f268 | 796 | |
d63b043d MM |
797 | if (inst->qlen >= qthreshold) |
798 | __nfulnl_flush(inst); | |
0597f268 HW |
799 | /* timer_pending always called within inst->lock, so there |
800 | * is no chance of a race here */ | |
d63b043d | 801 | else if (!timer_pending(&inst->timer)) { |
0597f268 HW |
802 | instance_get(inst); |
803 | inst->timer.expires = jiffies + (inst->flushtimeout*HZ/100); | |
804 | add_timer(&inst->timer); | |
805 | } | |
0597f268 | 806 | |
ed32abea MM |
807 | unlock_and_release: |
808 | spin_unlock_bh(&inst->lock); | |
809 | instance_put(inst); | |
0597f268 HW |
810 | return; |
811 | ||
812 | alloc_failure: | |
0597f268 | 813 | /* FIXME: statistics */ |
ed32abea | 814 | goto unlock_and_release; |
0597f268 HW |
815 | } |
816 | ||
817 | static int | |
818 | nfulnl_rcv_nl_event(struct notifier_block *this, | |
819 | unsigned long event, void *ptr) | |
820 | { | |
821 | struct netlink_notify *n = ptr; | |
9368a53c | 822 | struct nfnl_log_net *log = nfnl_log_pernet(n->net); |
0597f268 | 823 | |
dee5817e | 824 | if (event == NETLINK_URELEASE && n->protocol == NETLINK_NETFILTER) { |
0597f268 HW |
825 | int i; |
826 | ||
15e47304 | 827 | /* destroy all instances for this portid */ |
9368a53c | 828 | spin_lock_bh(&log->instances_lock); |
0597f268 | 829 | for (i = 0; i < INSTANCE_BUCKETS; i++) { |
b67bfe0d | 830 | struct hlist_node *t2; |
0597f268 | 831 | struct nfulnl_instance *inst; |
9368a53c | 832 | struct hlist_head *head = &log->instance_table[i]; |
0597f268 | 833 | |
b67bfe0d | 834 | hlist_for_each_entry_safe(inst, t2, head, hlist) { |
9368a53c | 835 | if (n->portid == inst->peer_portid) |
0597f268 HW |
836 | __instance_destroy(inst); |
837 | } | |
838 | } | |
9368a53c | 839 | spin_unlock_bh(&log->instances_lock); |
0597f268 HW |
840 | } |
841 | return NOTIFY_DONE; | |
842 | } | |
843 | ||
844 | static struct notifier_block nfulnl_rtnl_notifier = { | |
845 | .notifier_call = nfulnl_rcv_nl_event, | |
846 | }; | |
847 | ||
7b8002a1 PNA |
848 | static int nfulnl_recv_unsupp(struct net *net, struct sock *ctnl, |
849 | struct sk_buff *skb, const struct nlmsghdr *nlh, | |
04ba724b PNA |
850 | const struct nlattr * const nfqa[], |
851 | struct netlink_ext_ack *extack) | |
0597f268 HW |
852 | { |
853 | return -ENOTSUPP; | |
854 | } | |
855 | ||
ca735b3a | 856 | static struct nf_logger nfulnl_logger __read_mostly = { |
0597f268 | 857 | .name = "nfnetlink_log", |
5962815a | 858 | .type = NF_LOG_TYPE_ULOG, |
d4ef3835 | 859 | .logfn = nfulnl_log_packet, |
0597f268 HW |
860 | .me = THIS_MODULE, |
861 | }; | |
862 | ||
fd8281ad PM |
863 | static const struct nla_policy nfula_cfg_policy[NFULA_CFG_MAX+1] = { |
864 | [NFULA_CFG_CMD] = { .len = sizeof(struct nfulnl_msg_config_cmd) }, | |
865 | [NFULA_CFG_MODE] = { .len = sizeof(struct nfulnl_msg_config_mode) }, | |
866 | [NFULA_CFG_TIMEOUT] = { .type = NLA_U32 }, | |
867 | [NFULA_CFG_QTHRESH] = { .type = NLA_U32 }, | |
868 | [NFULA_CFG_NLBUFSIZ] = { .type = NLA_U32 }, | |
869 | [NFULA_CFG_FLAGS] = { .type = NLA_U16 }, | |
0597f268 HW |
870 | }; |
871 | ||
7b8002a1 PNA |
872 | static int nfulnl_recv_config(struct net *net, struct sock *ctnl, |
873 | struct sk_buff *skb, const struct nlmsghdr *nlh, | |
04ba724b PNA |
874 | const struct nlattr * const nfula[], |
875 | struct netlink_ext_ack *extack) | |
0597f268 | 876 | { |
d550d095 | 877 | struct nfgenmsg *nfmsg = nlmsg_data(nlh); |
0597f268 HW |
878 | u_int16_t group_num = ntohs(nfmsg->res_id); |
879 | struct nfulnl_instance *inst; | |
b7047a1c | 880 | struct nfulnl_msg_config_cmd *cmd = NULL; |
9368a53c | 881 | struct nfnl_log_net *log = nfnl_log_pernet(net); |
0597f268 | 882 | int ret = 0; |
c872a2d9 | 883 | u16 flags = 0; |
0597f268 | 884 | |
b7047a1c PM |
885 | if (nfula[NFULA_CFG_CMD]) { |
886 | u_int8_t pf = nfmsg->nfgen_family; | |
887 | cmd = nla_data(nfula[NFULA_CFG_CMD]); | |
888 | ||
889 | /* Commands without queue context */ | |
890 | switch (cmd->command) { | |
891 | case NFULNL_CFG_CMD_PF_BIND: | |
30e0c6a6 | 892 | return nf_log_bind_pf(net, pf, &nfulnl_logger); |
b7047a1c | 893 | case NFULNL_CFG_CMD_PF_UNBIND: |
30e0c6a6 | 894 | nf_log_unbind_pf(net, pf); |
b7047a1c PM |
895 | return 0; |
896 | } | |
897 | } | |
898 | ||
9368a53c | 899 | inst = instance_lookup_get(log, group_num); |
15e47304 | 900 | if (inst && inst->peer_portid != NETLINK_CB(skb).portid) { |
c0506365 PM |
901 | ret = -EPERM; |
902 | goto out_put; | |
903 | } | |
904 | ||
8cbc8708 PN |
905 | /* Check if we support these flags in first place, dependencies should |
906 | * be there too not to break atomicity. | |
907 | */ | |
908 | if (nfula[NFULA_CFG_FLAGS]) { | |
909 | flags = ntohs(nla_get_be16(nfula[NFULA_CFG_FLAGS])); | |
910 | ||
911 | if ((flags & NFULNL_CFG_F_CONNTRACK) && | |
912 | !rcu_access_pointer(nfnl_ct_hook)) { | |
913 | #ifdef CONFIG_MODULES | |
914 | nfnl_unlock(NFNL_SUBSYS_ULOG); | |
915 | request_module("ip_conntrack_netlink"); | |
916 | nfnl_lock(NFNL_SUBSYS_ULOG); | |
917 | if (rcu_access_pointer(nfnl_ct_hook)) { | |
918 | ret = -EAGAIN; | |
919 | goto out_put; | |
920 | } | |
921 | #endif | |
922 | ret = -EOPNOTSUPP; | |
923 | goto out_put; | |
924 | } | |
925 | } | |
926 | ||
b7047a1c | 927 | if (cmd != NULL) { |
0597f268 HW |
928 | switch (cmd->command) { |
929 | case NFULNL_CFG_CMD_BIND: | |
930 | if (inst) { | |
931 | ret = -EBUSY; | |
932 | goto out_put; | |
933 | } | |
934 | ||
9368a53c | 935 | inst = instance_create(net, group_num, |
15e47304 | 936 | NETLINK_CB(skb).portid, |
e32123e5 | 937 | sk_user_ns(NETLINK_CB(skb).sk)); |
baab2ce7 PM |
938 | if (IS_ERR(inst)) { |
939 | ret = PTR_ERR(inst); | |
f414c16c | 940 | goto out; |
0597f268 HW |
941 | } |
942 | break; | |
943 | case NFULNL_CFG_CMD_UNBIND: | |
944 | if (!inst) { | |
945 | ret = -ENODEV; | |
f414c16c | 946 | goto out; |
0597f268 HW |
947 | } |
948 | ||
9368a53c | 949 | instance_destroy(log, inst); |
a49c6503 | 950 | goto out_put; |
0597f268 | 951 | default: |
cd21f0ac | 952 | ret = -ENOTSUPP; |
eb075954 | 953 | goto out_put; |
0597f268 | 954 | } |
336a3b3e PNA |
955 | } else if (!inst) { |
956 | ret = -ENODEV; | |
957 | goto out; | |
0597f268 HW |
958 | } |
959 | ||
df6fb868 | 960 | if (nfula[NFULA_CFG_MODE]) { |
336a3b3e PNA |
961 | struct nfulnl_msg_config_mode *params = |
962 | nla_data(nfula[NFULA_CFG_MODE]); | |
0597f268 HW |
963 | |
964 | nfulnl_set_mode(inst, params->copy_mode, | |
d1208b99 | 965 | ntohl(params->copy_range)); |
0597f268 HW |
966 | } |
967 | ||
df6fb868 | 968 | if (nfula[NFULA_CFG_TIMEOUT]) { |
0dfedd28 | 969 | __be32 timeout = nla_get_be32(nfula[NFULA_CFG_TIMEOUT]); |
0597f268 HW |
970 | |
971 | nfulnl_set_timeout(inst, ntohl(timeout)); | |
972 | } | |
973 | ||
df6fb868 | 974 | if (nfula[NFULA_CFG_NLBUFSIZ]) { |
0dfedd28 | 975 | __be32 nlbufsiz = nla_get_be32(nfula[NFULA_CFG_NLBUFSIZ]); |
0597f268 HW |
976 | |
977 | nfulnl_set_nlbufsiz(inst, ntohl(nlbufsiz)); | |
978 | } | |
979 | ||
df6fb868 | 980 | if (nfula[NFULA_CFG_QTHRESH]) { |
0dfedd28 | 981 | __be32 qthresh = nla_get_be32(nfula[NFULA_CFG_QTHRESH]); |
0597f268 HW |
982 | |
983 | nfulnl_set_qthresh(inst, ntohl(qthresh)); | |
984 | } | |
985 | ||
8cbc8708 | 986 | if (nfula[NFULA_CFG_FLAGS]) |
a29a9a58 | 987 | nfulnl_set_flags(inst, flags); |
0af5f6c1 | 988 | |
0597f268 HW |
989 | out_put: |
990 | instance_put(inst); | |
dd16704e | 991 | out: |
0597f268 HW |
992 | return ret; |
993 | } | |
994 | ||
7c8d4cb4 | 995 | static const struct nfnl_callback nfulnl_cb[NFULNL_MSG_MAX] = { |
0597f268 | 996 | [NFULNL_MSG_PACKET] = { .call = nfulnl_recv_unsupp, |
37d2e7a2 | 997 | .attr_count = NFULA_MAX, }, |
0597f268 | 998 | [NFULNL_MSG_CONFIG] = { .call = nfulnl_recv_config, |
fd8281ad PM |
999 | .attr_count = NFULA_CFG_MAX, |
1000 | .policy = nfula_cfg_policy }, | |
0597f268 HW |
1001 | }; |
1002 | ||
7c8d4cb4 | 1003 | static const struct nfnetlink_subsystem nfulnl_subsys = { |
0597f268 HW |
1004 | .name = "log", |
1005 | .subsys_id = NFNL_SUBSYS_ULOG, | |
1006 | .cb_count = NFULNL_MSG_MAX, | |
0597f268 HW |
1007 | .cb = nfulnl_cb, |
1008 | }; | |
1009 | ||
1010 | #ifdef CONFIG_PROC_FS | |
1011 | struct iter_state { | |
9368a53c | 1012 | struct seq_net_private p; |
0597f268 HW |
1013 | unsigned int bucket; |
1014 | }; | |
1015 | ||
9368a53c | 1016 | static struct hlist_node *get_first(struct net *net, struct iter_state *st) |
0597f268 | 1017 | { |
9368a53c | 1018 | struct nfnl_log_net *log; |
0597f268 HW |
1019 | if (!st) |
1020 | return NULL; | |
1021 | ||
9368a53c G |
1022 | log = nfnl_log_pernet(net); |
1023 | ||
0597f268 | 1024 | for (st->bucket = 0; st->bucket < INSTANCE_BUCKETS; st->bucket++) { |
9368a53c G |
1025 | struct hlist_head *head = &log->instance_table[st->bucket]; |
1026 | ||
1027 | if (!hlist_empty(head)) | |
1028 | return rcu_dereference_bh(hlist_first_rcu(head)); | |
0597f268 HW |
1029 | } |
1030 | return NULL; | |
1031 | } | |
1032 | ||
9368a53c G |
1033 | static struct hlist_node *get_next(struct net *net, struct iter_state *st, |
1034 | struct hlist_node *h) | |
0597f268 | 1035 | { |
0e60ebe0 | 1036 | h = rcu_dereference_bh(hlist_next_rcu(h)); |
0597f268 | 1037 | while (!h) { |
9368a53c G |
1038 | struct nfnl_log_net *log; |
1039 | struct hlist_head *head; | |
1040 | ||
0597f268 HW |
1041 | if (++st->bucket >= INSTANCE_BUCKETS) |
1042 | return NULL; | |
1043 | ||
9368a53c G |
1044 | log = nfnl_log_pernet(net); |
1045 | head = &log->instance_table[st->bucket]; | |
1046 | h = rcu_dereference_bh(hlist_first_rcu(head)); | |
0597f268 HW |
1047 | } |
1048 | return h; | |
1049 | } | |
1050 | ||
9368a53c G |
1051 | static struct hlist_node *get_idx(struct net *net, struct iter_state *st, |
1052 | loff_t pos) | |
0597f268 HW |
1053 | { |
1054 | struct hlist_node *head; | |
9368a53c | 1055 | head = get_first(net, st); |
0597f268 HW |
1056 | |
1057 | if (head) | |
9368a53c | 1058 | while (pos && (head = get_next(net, st, head))) |
0597f268 HW |
1059 | pos--; |
1060 | return pos ? NULL : head; | |
1061 | } | |
1062 | ||
9368a53c | 1063 | static void *seq_start(struct seq_file *s, loff_t *pos) |
bed1be20 | 1064 | __acquires(rcu_bh) |
0597f268 | 1065 | { |
bed1be20 | 1066 | rcu_read_lock_bh(); |
9368a53c | 1067 | return get_idx(seq_file_net(s), s->private, *pos); |
0597f268 HW |
1068 | } |
1069 | ||
1070 | static void *seq_next(struct seq_file *s, void *v, loff_t *pos) | |
1071 | { | |
1072 | (*pos)++; | |
9368a53c | 1073 | return get_next(seq_file_net(s), s->private, v); |
0597f268 HW |
1074 | } |
1075 | ||
1076 | static void seq_stop(struct seq_file *s, void *v) | |
bed1be20 | 1077 | __releases(rcu_bh) |
0597f268 | 1078 | { |
bed1be20 | 1079 | rcu_read_unlock_bh(); |
0597f268 HW |
1080 | } |
1081 | ||
1082 | static int seq_show(struct seq_file *s, void *v) | |
1083 | { | |
1084 | const struct nfulnl_instance *inst = v; | |
1085 | ||
20a1d165 | 1086 | seq_printf(s, "%5u %6u %5u %1u %5u %6u %2u\n", |
1ca9e417 JP |
1087 | inst->group_num, |
1088 | inst->peer_portid, inst->qlen, | |
1089 | inst->copy_mode, inst->copy_range, | |
b54ab92b | 1090 | inst->flushtimeout, refcount_read(&inst->use)); |
1ca9e417 JP |
1091 | |
1092 | return 0; | |
0597f268 HW |
1093 | } |
1094 | ||
56b3d975 | 1095 | static const struct seq_operations nful_seq_ops = { |
0597f268 HW |
1096 | .start = seq_start, |
1097 | .next = seq_next, | |
1098 | .stop = seq_stop, | |
1099 | .show = seq_show, | |
1100 | }; | |
0597f268 HW |
1101 | #endif /* PROC_FS */ |
1102 | ||
9368a53c | 1103 | static int __net_init nfnl_log_net_init(struct net *net) |
0597f268 | 1104 | { |
9368a53c G |
1105 | unsigned int i; |
1106 | struct nfnl_log_net *log = nfnl_log_pernet(net); | |
f13f2aee PW |
1107 | #ifdef CONFIG_PROC_FS |
1108 | struct proc_dir_entry *proc; | |
1109 | kuid_t root_uid; | |
1110 | kgid_t root_gid; | |
1111 | #endif | |
601e68e1 | 1112 | |
0597f268 | 1113 | for (i = 0; i < INSTANCE_BUCKETS; i++) |
9368a53c G |
1114 | INIT_HLIST_HEAD(&log->instance_table[i]); |
1115 | spin_lock_init(&log->instances_lock); | |
1116 | ||
1117 | #ifdef CONFIG_PROC_FS | |
c3506372 CH |
1118 | proc = proc_create_net("nfnetlink_log", 0440, net->nf.proc_netfilter, |
1119 | &nful_seq_ops, sizeof(struct iter_state)); | |
f13f2aee | 1120 | if (!proc) |
9368a53c | 1121 | return -ENOMEM; |
f13f2aee PW |
1122 | |
1123 | root_uid = make_kuid(net->user_ns, 0); | |
1124 | root_gid = make_kgid(net->user_ns, 0); | |
1125 | if (uid_valid(root_uid) && gid_valid(root_gid)) | |
1126 | proc_set_user(proc, root_uid, root_gid); | |
9368a53c G |
1127 | #endif |
1128 | return 0; | |
1129 | } | |
1130 | ||
1131 | static void __net_exit nfnl_log_net_exit(struct net *net) | |
1132 | { | |
613d0776 VA |
1133 | struct nfnl_log_net *log = nfnl_log_pernet(net); |
1134 | unsigned int i; | |
1135 | ||
e778f56e | 1136 | #ifdef CONFIG_PROC_FS |
9368a53c | 1137 | remove_proc_entry("nfnetlink_log", net->nf.proc_netfilter); |
e778f56e | 1138 | #endif |
45c2aff6 | 1139 | nf_log_unset(net, &nfulnl_logger); |
613d0776 VA |
1140 | for (i = 0; i < INSTANCE_BUCKETS; i++) |
1141 | WARN_ON_ONCE(!hlist_empty(&log->instance_table[i])); | |
9368a53c G |
1142 | } |
1143 | ||
1144 | static struct pernet_operations nfnl_log_net_ops = { | |
1145 | .init = nfnl_log_net_init, | |
1146 | .exit = nfnl_log_net_exit, | |
1147 | .id = &nfnl_log_net_id, | |
1148 | .size = sizeof(struct nfnl_log_net), | |
1149 | }; | |
1150 | ||
1151 | static int __init nfnetlink_log_init(void) | |
1152 | { | |
3bfe0498 FR |
1153 | int status; |
1154 | ||
1155 | status = register_pernet_subsys(&nfnl_log_net_ops); | |
1156 | if (status < 0) { | |
1157 | pr_err("failed to register pernet ops\n"); | |
1158 | goto out; | |
1159 | } | |
601e68e1 | 1160 | |
0597f268 HW |
1161 | netlink_register_notifier(&nfulnl_rtnl_notifier); |
1162 | status = nfnetlink_subsys_register(&nfulnl_subsys); | |
1163 | if (status < 0) { | |
beacd3e8 | 1164 | pr_err("failed to create netlink socket\n"); |
0597f268 HW |
1165 | goto cleanup_netlink_notifier; |
1166 | } | |
1167 | ||
ca735b3a EL |
1168 | status = nf_log_register(NFPROTO_UNSPEC, &nfulnl_logger); |
1169 | if (status < 0) { | |
beacd3e8 | 1170 | pr_err("failed to register logger\n"); |
ca735b3a EL |
1171 | goto cleanup_subsys; |
1172 | } | |
1173 | ||
0597f268 HW |
1174 | return status; |
1175 | ||
0597f268 | 1176 | cleanup_subsys: |
0597f268 HW |
1177 | nfnetlink_subsys_unregister(&nfulnl_subsys); |
1178 | cleanup_netlink_notifier: | |
1179 | netlink_unregister_notifier(&nfulnl_rtnl_notifier); | |
3bfe0498 FR |
1180 | unregister_pernet_subsys(&nfnl_log_net_ops); |
1181 | out: | |
0597f268 HW |
1182 | return status; |
1183 | } | |
1184 | ||
65b4b4e8 | 1185 | static void __exit nfnetlink_log_fini(void) |
0597f268 | 1186 | { |
32292a7f PM |
1187 | nfnetlink_subsys_unregister(&nfulnl_subsys); |
1188 | netlink_unregister_notifier(&nfulnl_rtnl_notifier); | |
3bfe0498 | 1189 | unregister_pernet_subsys(&nfnl_log_net_ops); |
c83fa196 | 1190 | nf_log_unregister(&nfulnl_logger); |
0597f268 HW |
1191 | } |
1192 | ||
1193 | MODULE_DESCRIPTION("netfilter userspace logging"); | |
1194 | MODULE_AUTHOR("Harald Welte <laforge@netfilter.org>"); | |
1195 | MODULE_LICENSE("GPL"); | |
f682faef | 1196 | MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_ULOG); |
fab4085f PNA |
1197 | MODULE_ALIAS_NF_LOGGER(AF_INET, 1); |
1198 | MODULE_ALIAS_NF_LOGGER(AF_INET6, 1); | |
1199 | MODULE_ALIAS_NF_LOGGER(AF_BRIDGE, 1); | |
2497b846 | 1200 | MODULE_ALIAS_NF_LOGGER(3, 1); /* NFPROTO_ARP */ |
a7647080 | 1201 | MODULE_ALIAS_NF_LOGGER(5, 1); /* NFPROTO_NETDEV */ |
0597f268 | 1202 | |
65b4b4e8 AM |
1203 | module_init(nfnetlink_log_init); |
1204 | module_exit(nfnetlink_log_fini); |