Commit | Line | Data |
---|---|---|
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 | ||
ce20cdf4 | 46 | #define NFULNL_COPY_DISABLED 0xff |
c2db2924 | 47 | #define NFULNL_NLBUFSIZ_DEFAULT NLMSG_GOODSIZE |
2c6764b7 | 48 | #define NFULNL_TIMEOUT_DEFAULT 100 /* every second */ |
0597f268 | 49 | #define NFULNL_QTHRESH_DEFAULT 100 /* 100 packets */ |
c1e7dc91 FW |
50 | /* max packet size is limited by 16-bit struct nfattr nfa_len field */ |
51 | #define NFULNL_COPY_RANGE_MAX (0xFFFF - NLA_HDRLEN) | |
0597f268 HW |
52 | |
53 | #define PRINTR(x, args...) do { if (net_ratelimit()) \ | |
54 | printk(x, ## args); } while (0); | |
55 | ||
0597f268 HW |
56 | struct nfulnl_instance { |
57 | struct hlist_node hlist; /* global list of instances */ | |
58 | spinlock_t lock; | |
b54ab92b | 59 | refcount_t use; /* use count */ |
0597f268 HW |
60 | |
61 | unsigned int qlen; /* number of nlmsgs in skb */ | |
62 | struct sk_buff *skb; /* pre-allocatd skb */ | |
0597f268 | 63 | struct timer_list timer; |
9368a53c | 64 | struct net *net; |
9eea9515 | 65 | struct user_namespace *peer_user_ns; /* User namespace of the peer process */ |
cc6bc448 | 66 | u32 peer_portid; /* PORTID of the peer process */ |
0597f268 HW |
67 | |
68 | /* configurable parameters */ | |
69 | unsigned int flushtimeout; /* timeout until queue flush */ | |
70 | unsigned int nlbufsiz; /* netlink buffer allocation size */ | |
71 | unsigned int qthreshold; /* threshold of the queue */ | |
72 | u_int32_t copy_range; | |
0af5f6c1 | 73 | u_int32_t seq; /* instance-local sequential counter */ |
0597f268 | 74 | u_int16_t group_num; /* number of this queue */ |
0af5f6c1 | 75 | u_int16_t flags; |
601e68e1 | 76 | u_int8_t copy_mode; |
bed1be20 | 77 | struct rcu_head rcu; |
0597f268 HW |
78 | }; |
79 | ||
0597f268 | 80 | #define INSTANCE_BUCKETS 16 |
0597f268 | 81 | |
c7d03a00 | 82 | static unsigned int nfnl_log_net_id __read_mostly; |
9368a53c G |
83 | |
84 | struct nfnl_log_net { | |
85 | spinlock_t instances_lock; | |
86 | struct hlist_head instance_table[INSTANCE_BUCKETS]; | |
87 | atomic_t global_seq; | |
88 | }; | |
89 | ||
90 | static struct nfnl_log_net *nfnl_log_pernet(struct net *net) | |
91 | { | |
92 | return net_generic(net, nfnl_log_net_id); | |
93 | } | |
94 | ||
0597f268 HW |
95 | static inline u_int8_t instance_hashfn(u_int16_t group_num) |
96 | { | |
97 | return ((group_num & 0xff) % INSTANCE_BUCKETS); | |
98 | } | |
99 | ||
100 | static struct nfulnl_instance * | |
9368a53c | 101 | __instance_lookup(struct nfnl_log_net *log, u_int16_t group_num) |
0597f268 HW |
102 | { |
103 | struct hlist_head *head; | |
0597f268 HW |
104 | struct nfulnl_instance *inst; |
105 | ||
9368a53c | 106 | head = &log->instance_table[instance_hashfn(group_num)]; |
b67bfe0d | 107 | hlist_for_each_entry_rcu(inst, head, hlist) { |
0597f268 HW |
108 | if (inst->group_num == group_num) |
109 | return inst; | |
110 | } | |
111 | return NULL; | |
112 | } | |
113 | ||
114 | static inline void | |
115 | instance_get(struct nfulnl_instance *inst) | |
116 | { | |
b54ab92b | 117 | refcount_inc(&inst->use); |
0597f268 HW |
118 | } |
119 | ||
120 | static struct nfulnl_instance * | |
9368a53c | 121 | instance_lookup_get(struct nfnl_log_net *log, u_int16_t group_num) |
0597f268 HW |
122 | { |
123 | struct nfulnl_instance *inst; | |
124 | ||
bed1be20 | 125 | rcu_read_lock_bh(); |
9368a53c | 126 | inst = __instance_lookup(log, group_num); |
b54ab92b | 127 | if (inst && !refcount_inc_not_zero(&inst->use)) |
f5c5440d | 128 | inst = NULL; |
bed1be20 | 129 | rcu_read_unlock_bh(); |
0597f268 HW |
130 | |
131 | return inst; | |
132 | } | |
133 | ||
bed1be20 ED |
134 | static void nfulnl_instance_free_rcu(struct rcu_head *head) |
135 | { | |
9368a53c G |
136 | struct nfulnl_instance *inst = |
137 | container_of(head, struct nfulnl_instance, rcu); | |
138 | ||
139 | put_net(inst->net); | |
140 | kfree(inst); | |
bed1be20 ED |
141 | module_put(THIS_MODULE); |
142 | } | |
143 | ||
0597f268 HW |
144 | static void |
145 | instance_put(struct nfulnl_instance *inst) | |
146 | { | |
b54ab92b | 147 | if (inst && refcount_dec_and_test(&inst->use)) |
c8d1da40 | 148 | call_rcu(&inst->rcu, nfulnl_instance_free_rcu); |
0597f268 HW |
149 | } |
150 | ||
e99e88a9 | 151 | static void nfulnl_timer(struct timer_list *t); |
0597f268 HW |
152 | |
153 | static struct nfulnl_instance * | |
9368a53c | 154 | instance_create(struct net *net, u_int16_t group_num, |
cc6bc448 | 155 | u32 portid, struct user_namespace *user_ns) |
0597f268 HW |
156 | { |
157 | struct nfulnl_instance *inst; | |
9368a53c | 158 | struct nfnl_log_net *log = nfnl_log_pernet(net); |
baab2ce7 | 159 | int err; |
0597f268 | 160 | |
9368a53c G |
161 | spin_lock_bh(&log->instances_lock); |
162 | if (__instance_lookup(log, group_num)) { | |
baab2ce7 | 163 | err = -EEXIST; |
0597f268 HW |
164 | goto out_unlock; |
165 | } | |
166 | ||
10dfdc69 | 167 | inst = kzalloc(sizeof(*inst), GFP_ATOMIC); |
baab2ce7 PM |
168 | if (!inst) { |
169 | err = -ENOMEM; | |
0597f268 | 170 | goto out_unlock; |
baab2ce7 | 171 | } |
0597f268 | 172 | |
aace57e0 MM |
173 | if (!try_module_get(THIS_MODULE)) { |
174 | kfree(inst); | |
baab2ce7 | 175 | err = -EAGAIN; |
aace57e0 MM |
176 | goto out_unlock; |
177 | } | |
178 | ||
0597f268 | 179 | INIT_HLIST_NODE(&inst->hlist); |
181a46a5 | 180 | spin_lock_init(&inst->lock); |
0597f268 | 181 | /* needs to be two, since we _put() after creation */ |
b54ab92b | 182 | refcount_set(&inst->use, 2); |
0597f268 | 183 | |
e99e88a9 | 184 | timer_setup(&inst->timer, nfulnl_timer, 0); |
0597f268 | 185 | |
9368a53c | 186 | inst->net = get_net(net); |
9eea9515 | 187 | inst->peer_user_ns = user_ns; |
15e47304 | 188 | inst->peer_portid = portid; |
0597f268 HW |
189 | inst->group_num = group_num; |
190 | ||
191 | inst->qthreshold = NFULNL_QTHRESH_DEFAULT; | |
192 | inst->flushtimeout = NFULNL_TIMEOUT_DEFAULT; | |
193 | inst->nlbufsiz = NFULNL_NLBUFSIZ_DEFAULT; | |
194 | inst->copy_mode = NFULNL_COPY_PACKET; | |
6b6ec99a | 195 | inst->copy_range = NFULNL_COPY_RANGE_MAX; |
0597f268 | 196 | |
f5c5440d | 197 | hlist_add_head_rcu(&inst->hlist, |
9368a53c G |
198 | &log->instance_table[instance_hashfn(group_num)]); |
199 | ||
0597f268 | 200 | |
9368a53c | 201 | spin_unlock_bh(&log->instances_lock); |
0597f268 HW |
202 | |
203 | return inst; | |
204 | ||
0597f268 | 205 | out_unlock: |
9368a53c | 206 | spin_unlock_bh(&log->instances_lock); |
baab2ce7 | 207 | return ERR_PTR(err); |
0597f268 HW |
208 | } |
209 | ||
e3567061 | 210 | static void __nfulnl_flush(struct nfulnl_instance *inst); |
0597f268 | 211 | |
f5c5440d | 212 | /* called with BH disabled */ |
0597f268 | 213 | static void |
9afdb00c | 214 | __instance_destroy(struct nfulnl_instance *inst) |
0597f268 HW |
215 | { |
216 | /* first pull it out of the global list */ | |
f5c5440d | 217 | hlist_del_rcu(&inst->hlist); |
0597f268 | 218 | |
0597f268 HW |
219 | /* then flush all pending packets from skb */ |
220 | ||
f5c5440d ED |
221 | spin_lock(&inst->lock); |
222 | ||
223 | /* lockless readers wont be able to use us */ | |
224 | inst->copy_mode = NFULNL_COPY_DISABLED; | |
225 | ||
e3567061 MM |
226 | if (inst->skb) |
227 | __nfulnl_flush(inst); | |
f5c5440d | 228 | spin_unlock(&inst->lock); |
0597f268 HW |
229 | |
230 | /* and finally put the refcount */ | |
231 | instance_put(inst); | |
0597f268 HW |
232 | } |
233 | ||
0597f268 | 234 | static inline void |
9368a53c G |
235 | instance_destroy(struct nfnl_log_net *log, |
236 | struct nfulnl_instance *inst) | |
0597f268 | 237 | { |
9368a53c | 238 | spin_lock_bh(&log->instances_lock); |
9afdb00c | 239 | __instance_destroy(inst); |
9368a53c | 240 | spin_unlock_bh(&log->instances_lock); |
0597f268 HW |
241 | } |
242 | ||
243 | static int | |
244 | nfulnl_set_mode(struct nfulnl_instance *inst, u_int8_t mode, | |
245 | unsigned int range) | |
246 | { | |
247 | int status = 0; | |
248 | ||
249 | spin_lock_bh(&inst->lock); | |
601e68e1 | 250 | |
0597f268 HW |
251 | switch (mode) { |
252 | case NFULNL_COPY_NONE: | |
253 | case NFULNL_COPY_META: | |
254 | inst->copy_mode = mode; | |
255 | inst->copy_range = 0; | |
256 | break; | |
601e68e1 | 257 | |
0597f268 HW |
258 | case NFULNL_COPY_PACKET: |
259 | inst->copy_mode = mode; | |
c1e7dc91 FW |
260 | if (range == 0) |
261 | range = NFULNL_COPY_RANGE_MAX; | |
6b6ec99a MM |
262 | inst->copy_range = min_t(unsigned int, |
263 | range, NFULNL_COPY_RANGE_MAX); | |
0597f268 | 264 | break; |
601e68e1 | 265 | |
0597f268 HW |
266 | default: |
267 | status = -EINVAL; | |
268 | break; | |
269 | } | |
270 | ||
271 | spin_unlock_bh(&inst->lock); | |
272 | ||
273 | return status; | |
274 | } | |
275 | ||
276 | static int | |
277 | nfulnl_set_nlbufsiz(struct nfulnl_instance *inst, u_int32_t nlbufsiz) | |
278 | { | |
279 | int status; | |
280 | ||
281 | spin_lock_bh(&inst->lock); | |
282 | if (nlbufsiz < NFULNL_NLBUFSIZ_DEFAULT) | |
283 | status = -ERANGE; | |
284 | else if (nlbufsiz > 131072) | |
285 | status = -ERANGE; | |
286 | else { | |
287 | inst->nlbufsiz = nlbufsiz; | |
288 | status = 0; | |
289 | } | |
290 | spin_unlock_bh(&inst->lock); | |
291 | ||
292 | return status; | |
293 | } | |
294 | ||
23509fcd | 295 | static void |
0597f268 HW |
296 | nfulnl_set_timeout(struct nfulnl_instance *inst, u_int32_t timeout) |
297 | { | |
298 | spin_lock_bh(&inst->lock); | |
299 | inst->flushtimeout = timeout; | |
300 | spin_unlock_bh(&inst->lock); | |
0597f268 HW |
301 | } |
302 | ||
23509fcd | 303 | static void |
0597f268 HW |
304 | nfulnl_set_qthresh(struct nfulnl_instance *inst, u_int32_t qthresh) |
305 | { | |
306 | spin_lock_bh(&inst->lock); | |
307 | inst->qthreshold = qthresh; | |
308 | spin_unlock_bh(&inst->lock); | |
0597f268 HW |
309 | } |
310 | ||
0af5f6c1 HW |
311 | static int |
312 | nfulnl_set_flags(struct nfulnl_instance *inst, u_int16_t flags) | |
313 | { | |
314 | spin_lock_bh(&inst->lock); | |
ee433530 | 315 | inst->flags = flags; |
0af5f6c1 HW |
316 | spin_unlock_bh(&inst->lock); |
317 | ||
318 | return 0; | |
319 | } | |
320 | ||
c6a8f648 | 321 | static struct sk_buff * |
afff14f6 G |
322 | nfulnl_alloc_skb(struct net *net, u32 peer_portid, unsigned int inst_size, |
323 | unsigned int pkt_size) | |
0597f268 HW |
324 | { |
325 | struct sk_buff *skb; | |
ad2ad0f9 | 326 | unsigned int n; |
0597f268 | 327 | |
0597f268 HW |
328 | /* alloc skb which should be big enough for a whole multipart |
329 | * message. WARNING: has to be <= 128k due to slab restrictions */ | |
330 | ||
ad2ad0f9 | 331 | n = max(inst_size, pkt_size); |
0813fbc9 | 332 | skb = alloc_skb(n, GFP_ATOMIC | __GFP_NOWARN); |
0597f268 | 333 | if (!skb) { |
ad2ad0f9 PM |
334 | if (n > pkt_size) { |
335 | /* try to allocate only as much as we need for current | |
336 | * packet */ | |
0597f268 | 337 | |
905f0a73 | 338 | skb = alloc_skb(pkt_size, GFP_ATOMIC); |
ad2ad0f9 | 339 | } |
0597f268 HW |
340 | } |
341 | ||
342 | return skb; | |
343 | } | |
344 | ||
b51d3fa3 | 345 | static void |
0597f268 HW |
346 | __nfulnl_send(struct nfulnl_instance *inst) |
347 | { | |
d550d095 DM |
348 | if (inst->qlen > 1) { |
349 | struct nlmsghdr *nlh = nlmsg_put(inst->skb, 0, 0, | |
350 | NLMSG_DONE, | |
351 | sizeof(struct nfgenmsg), | |
352 | 0); | |
b51d3fa3 HL |
353 | if (WARN_ONCE(!nlh, "bad nlskb size: %u, tailroom %d\n", |
354 | inst->skb->len, skb_tailroom(inst->skb))) { | |
355 | kfree_skb(inst->skb); | |
d550d095 | 356 | goto out; |
b51d3fa3 | 357 | } |
d550d095 | 358 | } |
ee921183 | 359 | nfnetlink_unicast(inst->skb, inst->net, inst->peer_portid); |
b51d3fa3 | 360 | out: |
0597f268 HW |
361 | inst->qlen = 0; |
362 | inst->skb = NULL; | |
0597f268 HW |
363 | } |
364 | ||
e3567061 MM |
365 | static void |
366 | __nfulnl_flush(struct nfulnl_instance *inst) | |
367 | { | |
368 | /* timer holds a reference */ | |
369 | if (del_timer(&inst->timer)) | |
370 | instance_put(inst); | |
371 | if (inst->skb) | |
372 | __nfulnl_send(inst); | |
373 | } | |
374 | ||
c6a8f648 | 375 | static void |
e99e88a9 | 376 | nfulnl_timer(struct timer_list *t) |
0597f268 | 377 | { |
e99e88a9 | 378 | struct nfulnl_instance *inst = from_timer(inst, t, timer); |
0597f268 | 379 | |
0597f268 | 380 | spin_lock_bh(&inst->lock); |
370e6a87 MM |
381 | if (inst->skb) |
382 | __nfulnl_send(inst); | |
0597f268 | 383 | spin_unlock_bh(&inst->lock); |
05f7b7b3 | 384 | instance_put(inst); |
0597f268 HW |
385 | } |
386 | ||
65af4a10 MB |
387 | static u32 nfulnl_get_bridge_size(const struct sk_buff *skb) |
388 | { | |
389 | u32 size = 0; | |
390 | ||
391 | if (!skb_mac_header_was_set(skb)) | |
392 | return 0; | |
393 | ||
394 | if (skb_vlan_tag_present(skb)) { | |
395 | size += nla_total_size(0); /* nested */ | |
396 | size += nla_total_size(sizeof(u16)); /* id */ | |
397 | size += nla_total_size(sizeof(u16)); /* tag */ | |
398 | } | |
399 | ||
400 | if (skb->network_header > skb->mac_header) | |
401 | size += nla_total_size(skb->network_header - skb->mac_header); | |
402 | ||
403 | return size; | |
404 | } | |
405 | ||
406 | static int nfulnl_put_bridge(struct nfulnl_instance *inst, const struct sk_buff *skb) | |
407 | { | |
408 | if (!skb_mac_header_was_set(skb)) | |
409 | return 0; | |
410 | ||
411 | if (skb_vlan_tag_present(skb)) { | |
412 | struct nlattr *nest; | |
413 | ||
414 | nest = nla_nest_start(inst->skb, NFULA_VLAN); | |
415 | if (!nest) | |
416 | goto nla_put_failure; | |
417 | ||
418 | if (nla_put_be16(inst->skb, NFULA_VLAN_TCI, htons(skb->vlan_tci)) || | |
419 | nla_put_be16(inst->skb, NFULA_VLAN_PROTO, skb->vlan_proto)) | |
420 | goto nla_put_failure; | |
421 | ||
422 | nla_nest_end(inst->skb, nest); | |
423 | } | |
424 | ||
425 | if (skb->mac_header < skb->network_header) { | |
426 | int len = (int)(skb->network_header - skb->mac_header); | |
427 | ||
428 | if (nla_put(inst->skb, NFULA_L2HDR, len, skb_mac_header(skb))) | |
429 | goto nla_put_failure; | |
430 | } | |
431 | ||
432 | return 0; | |
433 | ||
434 | nla_put_failure: | |
435 | return -1; | |
436 | } | |
437 | ||
0af5f6c1 HW |
438 | /* This is an inline function, we don't really care about a long |
439 | * list of arguments */ | |
601e68e1 | 440 | static inline int |
9368a53c G |
441 | __build_packet_message(struct nfnl_log_net *log, |
442 | struct nfulnl_instance *inst, | |
601e68e1 | 443 | const struct sk_buff *skb, |
0597f268 | 444 | unsigned int data_len, |
76108cea | 445 | u_int8_t pf, |
0597f268 HW |
446 | unsigned int hooknum, |
447 | const struct net_device *indev, | |
448 | const struct net_device *outdev, | |
a29a9a58 KM |
449 | const char *prefix, unsigned int plen, |
450 | const struct nfnl_ct_hook *nfnl_ct, | |
451 | struct nf_conn *ct, enum ip_conntrack_info ctinfo) | |
0597f268 | 452 | { |
0597f268 HW |
453 | struct nfulnl_msg_packet_hdr pmsg; |
454 | struct nlmsghdr *nlh; | |
455 | struct nfgenmsg *nfmsg; | |
27a884dc | 456 | sk_buff_data_t old_tail = inst->skb->tail; |
0626af31 | 457 | struct sock *sk; |
0c36b48b | 458 | const unsigned char *hwhdrp; |
0597f268 | 459 | |
d550d095 | 460 | nlh = nlmsg_put(inst->skb, 0, 0, |
dedb67c4 | 461 | nfnl_msg_type(NFNL_SUBSYS_ULOG, NFULNL_MSG_PACKET), |
d550d095 DM |
462 | sizeof(struct nfgenmsg), 0); |
463 | if (!nlh) | |
464 | return -1; | |
465 | nfmsg = nlmsg_data(nlh); | |
0597f268 HW |
466 | nfmsg->nfgen_family = pf; |
467 | nfmsg->version = NFNETLINK_V0; | |
468 | nfmsg->res_id = htons(inst->group_num); | |
469 | ||
e4d091d7 | 470 | memset(&pmsg, 0, sizeof(pmsg)); |
febf0a43 | 471 | pmsg.hw_protocol = skb->protocol; |
0597f268 HW |
472 | pmsg.hook = hooknum; |
473 | ||
1db20a52 DM |
474 | if (nla_put(inst->skb, NFULA_PACKET_HDR, sizeof(pmsg), &pmsg)) |
475 | goto nla_put_failure; | |
0597f268 | 476 | |
1db20a52 DM |
477 | if (prefix && |
478 | nla_put(inst->skb, NFULA_PREFIX, plen, prefix)) | |
479 | goto nla_put_failure; | |
0597f268 HW |
480 | |
481 | if (indev) { | |
1109a90c | 482 | #if !IS_ENABLED(CONFIG_BRIDGE_NETFILTER) |
1db20a52 DM |
483 | if (nla_put_be32(inst->skb, NFULA_IFINDEX_INDEV, |
484 | htonl(indev->ifindex))) | |
485 | goto nla_put_failure; | |
fbcd923c HW |
486 | #else |
487 | if (pf == PF_BRIDGE) { | |
488 | /* Case 1: outdev is physical input device, we need to | |
489 | * look for bridge group (when called from | |
490 | * netfilter_bridge) */ | |
1db20a52 DM |
491 | if (nla_put_be32(inst->skb, NFULA_IFINDEX_PHYSINDEV, |
492 | htonl(indev->ifindex)) || | |
fbcd923c | 493 | /* this is the bridge group "brX" */ |
e2361cb9 AC |
494 | /* rcu_read_lock()ed by nf_hook_thresh or |
495 | * nf_log_packet. | |
496 | */ | |
1db20a52 DM |
497 | nla_put_be32(inst->skb, NFULA_IFINDEX_INDEV, |
498 | htonl(br_port_get_rcu(indev)->br->dev->ifindex))) | |
499 | goto nla_put_failure; | |
fbcd923c | 500 | } else { |
c737b7c4 FW |
501 | struct net_device *physindev; |
502 | ||
fbcd923c HW |
503 | /* Case 2: indev is bridge group, we need to look for |
504 | * physical device (when called from ipv4) */ | |
1db20a52 DM |
505 | if (nla_put_be32(inst->skb, NFULA_IFINDEX_INDEV, |
506 | htonl(indev->ifindex))) | |
507 | goto nla_put_failure; | |
c737b7c4 FW |
508 | |
509 | physindev = nf_bridge_get_physindev(skb); | |
510 | if (physindev && | |
1db20a52 | 511 | nla_put_be32(inst->skb, NFULA_IFINDEX_PHYSINDEV, |
c737b7c4 | 512 | htonl(physindev->ifindex))) |
1db20a52 | 513 | goto nla_put_failure; |
fbcd923c HW |
514 | } |
515 | #endif | |
0597f268 HW |
516 | } |
517 | ||
518 | if (outdev) { | |
1109a90c | 519 | #if !IS_ENABLED(CONFIG_BRIDGE_NETFILTER) |
1db20a52 DM |
520 | if (nla_put_be32(inst->skb, NFULA_IFINDEX_OUTDEV, |
521 | htonl(outdev->ifindex))) | |
522 | goto nla_put_failure; | |
fbcd923c HW |
523 | #else |
524 | if (pf == PF_BRIDGE) { | |
525 | /* Case 1: outdev is physical output device, we need to | |
526 | * look for bridge group (when called from | |
527 | * netfilter_bridge) */ | |
1db20a52 DM |
528 | if (nla_put_be32(inst->skb, NFULA_IFINDEX_PHYSOUTDEV, |
529 | htonl(outdev->ifindex)) || | |
fbcd923c | 530 | /* this is the bridge group "brX" */ |
e2361cb9 AC |
531 | /* rcu_read_lock()ed by nf_hook_thresh or |
532 | * nf_log_packet. | |
533 | */ | |
1db20a52 DM |
534 | nla_put_be32(inst->skb, NFULA_IFINDEX_OUTDEV, |
535 | htonl(br_port_get_rcu(outdev)->br->dev->ifindex))) | |
536 | goto nla_put_failure; | |
fbcd923c | 537 | } else { |
c737b7c4 FW |
538 | struct net_device *physoutdev; |
539 | ||
fbcd923c HW |
540 | /* Case 2: indev is a bridge group, we need to look |
541 | * for physical device (when called from ipv4) */ | |
1db20a52 DM |
542 | if (nla_put_be32(inst->skb, NFULA_IFINDEX_OUTDEV, |
543 | htonl(outdev->ifindex))) | |
544 | goto nla_put_failure; | |
c737b7c4 FW |
545 | |
546 | physoutdev = nf_bridge_get_physoutdev(skb); | |
547 | if (physoutdev && | |
1db20a52 | 548 | nla_put_be32(inst->skb, NFULA_IFINDEX_PHYSOUTDEV, |
c737b7c4 | 549 | htonl(physoutdev->ifindex))) |
1db20a52 | 550 | goto nla_put_failure; |
fbcd923c HW |
551 | } |
552 | #endif | |
0597f268 HW |
553 | } |
554 | ||
1db20a52 DM |
555 | if (skb->mark && |
556 | nla_put_be32(inst->skb, NFULA_MARK, htonl(skb->mark))) | |
557 | goto nla_put_failure; | |
0597f268 | 558 | |
2c38de4c NC |
559 | if (indev && skb->dev && |
560 | skb->mac_header != skb->network_header) { | |
0597f268 | 561 | struct nfulnl_msg_packet_hw phw; |
e4d091d7 DC |
562 | int len; |
563 | ||
564 | memset(&phw, 0, sizeof(phw)); | |
565 | len = dev_parse_header(skb, phw.hw_addr); | |
b95cce35 SH |
566 | if (len > 0) { |
567 | phw.hw_addrlen = htons(len); | |
1db20a52 DM |
568 | if (nla_put(inst->skb, NFULA_HWADDR, sizeof(phw), &phw)) |
569 | goto nla_put_failure; | |
b95cce35 | 570 | } |
0597f268 HW |
571 | } |
572 | ||
72961ecf | 573 | if (indev && skb_mac_header_was_set(skb)) { |
2dba62c3 | 574 | if (nla_put_be16(inst->skb, NFULA_HWTYPE, htons(skb->dev->type)) || |
1db20a52 | 575 | nla_put_be16(inst->skb, NFULA_HWLEN, |
0c36b48b BH |
576 | htons(skb->dev->hard_header_len))) |
577 | goto nla_put_failure; | |
578 | ||
579 | hwhdrp = skb_mac_header(skb); | |
580 | ||
581 | if (skb->dev->type == ARPHRD_SIT) | |
582 | hwhdrp -= ETH_HLEN; | |
583 | ||
584 | if (hwhdrp >= skb->head && | |
585 | nla_put(inst->skb, NFULA_HWHEADER, | |
586 | skb->dev->hard_header_len, hwhdrp)) | |
1db20a52 | 587 | goto nla_put_failure; |
72961ecf EL |
588 | } |
589 | ||
916f6efa | 590 | if (hooknum <= NF_INET_FORWARD && skb->tstamp) { |
0597f268 | 591 | struct nfulnl_msg_packet_timestamp ts; |
f6389ecb AB |
592 | struct timespec64 kts = ktime_to_timespec64(skb->tstamp); |
593 | ts.sec = cpu_to_be64(kts.tv_sec); | |
594 | ts.usec = cpu_to_be64(kts.tv_nsec / NSEC_PER_USEC); | |
0597f268 | 595 | |
1db20a52 DM |
596 | if (nla_put(inst->skb, NFULA_TIMESTAMP, sizeof(ts), &ts)) |
597 | goto nla_put_failure; | |
0597f268 HW |
598 | } |
599 | ||
600 | /* UID */ | |
0626af31 | 601 | sk = skb->sk; |
a8399231 | 602 | if (sk && sk_fullsock(sk)) { |
0626af31 ED |
603 | read_lock_bh(&sk->sk_callback_lock); |
604 | if (sk->sk_socket && sk->sk_socket->file) { | |
605 | struct file *file = sk->sk_socket->file; | |
437589a7 LT |
606 | const struct cred *cred = file->f_cred; |
607 | struct user_namespace *user_ns = inst->peer_user_ns; | |
608 | __be32 uid = htonl(from_kuid_munged(user_ns, cred->fsuid)); | |
609 | __be32 gid = htonl(from_kgid_munged(user_ns, cred->fsgid)); | |
0626af31 | 610 | read_unlock_bh(&sk->sk_callback_lock); |
1db20a52 DM |
611 | if (nla_put_be32(inst->skb, NFULA_UID, uid) || |
612 | nla_put_be32(inst->skb, NFULA_GID, gid)) | |
613 | goto nla_put_failure; | |
0597f268 | 614 | } else |
0626af31 | 615 | read_unlock_bh(&sk->sk_callback_lock); |
0597f268 HW |
616 | } |
617 | ||
0af5f6c1 | 618 | /* local sequence number */ |
1db20a52 DM |
619 | if ((inst->flags & NFULNL_CFG_F_SEQ) && |
620 | nla_put_be32(inst->skb, NFULA_SEQ, htonl(inst->seq++))) | |
621 | goto nla_put_failure; | |
0dfedd28 | 622 | |
0af5f6c1 | 623 | /* global sequence number */ |
1db20a52 DM |
624 | if ((inst->flags & NFULNL_CFG_F_SEQ_GLOBAL) && |
625 | nla_put_be32(inst->skb, NFULA_SEQ_GLOBAL, | |
9368a53c | 626 | htonl(atomic_inc_return(&log->global_seq)))) |
1db20a52 | 627 | goto nla_put_failure; |
0af5f6c1 | 628 | |
a29a9a58 KM |
629 | if (ct && nfnl_ct->build(inst->skb, ct, ctinfo, |
630 | NFULA_CT, NFULA_CT_INFO) < 0) | |
631 | goto nla_put_failure; | |
632 | ||
65af4a10 MB |
633 | if ((pf == NFPROTO_NETDEV || pf == NFPROTO_BRIDGE) && |
634 | nfulnl_put_bridge(inst, skb) < 0) | |
635 | goto nla_put_failure; | |
636 | ||
0597f268 | 637 | if (data_len) { |
df6fb868 PM |
638 | struct nlattr *nla; |
639 | int size = nla_attr_size(data_len); | |
0597f268 | 640 | |
82251615 PNA |
641 | if (skb_tailroom(inst->skb) < nla_total_size(data_len)) |
642 | goto nla_put_failure; | |
0597f268 | 643 | |
4df864c1 | 644 | nla = skb_put(inst->skb, nla_total_size(data_len)); |
df6fb868 PM |
645 | nla->nla_type = NFULA_PAYLOAD; |
646 | nla->nla_len = size; | |
0597f268 | 647 | |
df6fb868 | 648 | if (skb_copy_bits(skb, 0, nla_data(nla), data_len)) |
0597f268 HW |
649 | BUG(); |
650 | } | |
601e68e1 | 651 | |
0597f268 HW |
652 | nlh->nlmsg_len = inst->skb->tail - old_tail; |
653 | return 0; | |
654 | ||
df6fb868 | 655 | nla_put_failure: |
0597f268 HW |
656 | PRINTR(KERN_ERR "nfnetlink_log: error creating log nlmsg\n"); |
657 | return -1; | |
658 | } | |
659 | ||
549d2d41 | 660 | static const struct nf_loginfo default_loginfo = { |
0597f268 HW |
661 | .type = NF_LOG_TYPE_ULOG, |
662 | .u = { | |
663 | .ulog = { | |
664 | .copy_len = 0xffff, | |
665 | .group = 0, | |
666 | .qthreshold = 1, | |
667 | }, | |
668 | }, | |
669 | }; | |
670 | ||
671 | /* log handler for internal netfilter logging api */ | |
ce20cdf4 | 672 | static void |
8cdb46da HS |
673 | nfulnl_log_packet(struct net *net, |
674 | u_int8_t pf, | |
0597f268 HW |
675 | unsigned int hooknum, |
676 | const struct sk_buff *skb, | |
677 | const struct net_device *in, | |
678 | const struct net_device *out, | |
679 | const struct nf_loginfo *li_user, | |
680 | const char *prefix) | |
681 | { | |
a29a9a58 KM |
682 | size_t size; |
683 | unsigned int data_len; | |
0597f268 HW |
684 | struct nfulnl_instance *inst; |
685 | const struct nf_loginfo *li; | |
686 | unsigned int qthreshold; | |
ce20cdf4 | 687 | unsigned int plen = 0; |
9368a53c | 688 | struct nfnl_log_net *log = nfnl_log_pernet(net); |
a29a9a58 KM |
689 | const struct nfnl_ct_hook *nfnl_ct = NULL; |
690 | struct nf_conn *ct = NULL; | |
3f649ab7 | 691 | enum ip_conntrack_info ctinfo; |
0597f268 | 692 | |
601e68e1 | 693 | if (li_user && li_user->type == NF_LOG_TYPE_ULOG) |
0597f268 HW |
694 | li = li_user; |
695 | else | |
696 | li = &default_loginfo; | |
697 | ||
9368a53c | 698 | inst = instance_lookup_get(log, li->u.ulog.group); |
0597f268 | 699 | if (!inst) |
0597f268 | 700 | return; |
0597f268 | 701 | |
d7a5c324 | 702 | if (prefix) |
881dbfe8 | 703 | plen = strlen(prefix) + 1; |
d7a5c324 | 704 | |
0597f268 HW |
705 | /* FIXME: do we want to make the size calculation conditional based on |
706 | * what is actually present? way more branches and checks, but more | |
707 | * memory efficient... */ | |
7e59b3fe | 708 | size = nlmsg_total_size(sizeof(struct nfgenmsg)) |
df6fb868 PM |
709 | + nla_total_size(sizeof(struct nfulnl_msg_packet_hdr)) |
710 | + nla_total_size(sizeof(u_int32_t)) /* ifindex */ | |
711 | + nla_total_size(sizeof(u_int32_t)) /* ifindex */ | |
1109a90c | 712 | #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER) |
df6fb868 PM |
713 | + nla_total_size(sizeof(u_int32_t)) /* ifindex */ |
714 | + nla_total_size(sizeof(u_int32_t)) /* ifindex */ | |
fbcd923c | 715 | #endif |
df6fb868 PM |
716 | + nla_total_size(sizeof(u_int32_t)) /* mark */ |
717 | + nla_total_size(sizeof(u_int32_t)) /* uid */ | |
76aa1ce1 | 718 | + nla_total_size(sizeof(u_int32_t)) /* gid */ |
df6fb868 PM |
719 | + nla_total_size(plen) /* prefix */ |
720 | + nla_total_size(sizeof(struct nfulnl_msg_packet_hw)) | |
9dfa1dfe FW |
721 | + nla_total_size(sizeof(struct nfulnl_msg_packet_timestamp)) |
722 | + nla_total_size(sizeof(struct nfgenmsg)); /* NLMSG_DONE */ | |
0597f268 | 723 | |
eeff9bee | 724 | if (in && skb_mac_header_was_set(skb)) { |
7e59b3fe | 725 | size += nla_total_size(skb->dev->hard_header_len) |
eeff9bee PNA |
726 | + nla_total_size(sizeof(u_int16_t)) /* hwtype */ |
727 | + nla_total_size(sizeof(u_int16_t)); /* hwlen */ | |
728 | } | |
729 | ||
0597f268 HW |
730 | spin_lock_bh(&inst->lock); |
731 | ||
0af5f6c1 | 732 | if (inst->flags & NFULNL_CFG_F_SEQ) |
df6fb868 | 733 | size += nla_total_size(sizeof(u_int32_t)); |
0af5f6c1 | 734 | if (inst->flags & NFULNL_CFG_F_SEQ_GLOBAL) |
df6fb868 | 735 | size += nla_total_size(sizeof(u_int32_t)); |
a29a9a58 KM |
736 | if (inst->flags & NFULNL_CFG_F_CONNTRACK) { |
737 | nfnl_ct = rcu_dereference(nfnl_ct_hook); | |
738 | if (nfnl_ct != NULL) { | |
739 | ct = nfnl_ct->get_ct(skb, &ctinfo); | |
740 | if (ct != NULL) | |
741 | size += nfnl_ct->build_size(ct); | |
742 | } | |
743 | } | |
65af4a10 MB |
744 | if (pf == NFPROTO_NETDEV || pf == NFPROTO_BRIDGE) |
745 | size += nfulnl_get_bridge_size(skb); | |
0af5f6c1 | 746 | |
0597f268 HW |
747 | qthreshold = inst->qthreshold; |
748 | /* per-rule qthreshold overrides per-instance */ | |
5ca431f9 EL |
749 | if (li->u.ulog.qthreshold) |
750 | if (qthreshold > li->u.ulog.qthreshold) | |
751 | qthreshold = li->u.ulog.qthreshold; | |
752 | ||
601e68e1 | 753 | |
0597f268 HW |
754 | switch (inst->copy_mode) { |
755 | case NFULNL_COPY_META: | |
756 | case NFULNL_COPY_NONE: | |
757 | data_len = 0; | |
758 | break; | |
601e68e1 | 759 | |
0597f268 | 760 | case NFULNL_COPY_PACKET: |
7643507f VP |
761 | data_len = inst->copy_range; |
762 | if ((li->u.ulog.flags & NF_LOG_F_COPY_LEN) && | |
763 | (li->u.ulog.copy_len < data_len)) | |
764 | data_len = li->u.ulog.copy_len; | |
765 | ||
766 | if (data_len > skb->len) | |
0597f268 | 767 | data_len = skb->len; |
601e68e1 | 768 | |
df6fb868 | 769 | size += nla_total_size(data_len); |
0597f268 | 770 | break; |
601e68e1 | 771 | |
f5c5440d | 772 | case NFULNL_COPY_DISABLED: |
0597f268 | 773 | default: |
55b5a91e | 774 | goto unlock_and_release; |
0597f268 HW |
775 | } |
776 | ||
9dfa1dfe | 777 | if (inst->skb && size > skb_tailroom(inst->skb)) { |
0597f268 HW |
778 | /* either the queue len is too high or we don't have |
779 | * enough room in the skb left. flush to userspace. */ | |
e3567061 | 780 | __nfulnl_flush(inst); |
55b5a91e | 781 | } |
0597f268 | 782 | |
55b5a91e | 783 | if (!inst->skb) { |
afff14f6 G |
784 | inst->skb = nfulnl_alloc_skb(net, inst->peer_portid, |
785 | inst->nlbufsiz, size); | |
55b5a91e | 786 | if (!inst->skb) |
0597f268 | 787 | goto alloc_failure; |
0597f268 HW |
788 | } |
789 | ||
0597f268 HW |
790 | inst->qlen++; |
791 | ||
9368a53c | 792 | __build_packet_message(log, inst, skb, data_len, pf, |
a29a9a58 KM |
793 | hooknum, in, out, prefix, plen, |
794 | nfnl_ct, ct, ctinfo); | |
0597f268 | 795 | |
d63b043d MM |
796 | if (inst->qlen >= qthreshold) |
797 | __nfulnl_flush(inst); | |
0597f268 HW |
798 | /* timer_pending always called within inst->lock, so there |
799 | * is no chance of a race here */ | |
d63b043d | 800 | else if (!timer_pending(&inst->timer)) { |
0597f268 HW |
801 | instance_get(inst); |
802 | inst->timer.expires = jiffies + (inst->flushtimeout*HZ/100); | |
803 | add_timer(&inst->timer); | |
804 | } | |
0597f268 | 805 | |
ed32abea MM |
806 | unlock_and_release: |
807 | spin_unlock_bh(&inst->lock); | |
808 | instance_put(inst); | |
0597f268 HW |
809 | return; |
810 | ||
811 | alloc_failure: | |
0597f268 | 812 | /* FIXME: statistics */ |
ed32abea | 813 | goto unlock_and_release; |
0597f268 HW |
814 | } |
815 | ||
816 | static int | |
817 | nfulnl_rcv_nl_event(struct notifier_block *this, | |
818 | unsigned long event, void *ptr) | |
819 | { | |
820 | struct netlink_notify *n = ptr; | |
9368a53c | 821 | struct nfnl_log_net *log = nfnl_log_pernet(n->net); |
0597f268 | 822 | |
dee5817e | 823 | if (event == NETLINK_URELEASE && n->protocol == NETLINK_NETFILTER) { |
0597f268 HW |
824 | int i; |
825 | ||
15e47304 | 826 | /* destroy all instances for this portid */ |
9368a53c | 827 | spin_lock_bh(&log->instances_lock); |
0597f268 | 828 | for (i = 0; i < INSTANCE_BUCKETS; i++) { |
b67bfe0d | 829 | struct hlist_node *t2; |
0597f268 | 830 | struct nfulnl_instance *inst; |
9368a53c | 831 | struct hlist_head *head = &log->instance_table[i]; |
0597f268 | 832 | |
b67bfe0d | 833 | hlist_for_each_entry_safe(inst, t2, head, hlist) { |
9368a53c | 834 | if (n->portid == inst->peer_portid) |
0597f268 HW |
835 | __instance_destroy(inst); |
836 | } | |
837 | } | |
9368a53c | 838 | spin_unlock_bh(&log->instances_lock); |
0597f268 HW |
839 | } |
840 | return NOTIFY_DONE; | |
841 | } | |
842 | ||
843 | static struct notifier_block nfulnl_rtnl_notifier = { | |
844 | .notifier_call = nfulnl_rcv_nl_event, | |
845 | }; | |
846 | ||
7b8002a1 PNA |
847 | static int nfulnl_recv_unsupp(struct net *net, struct sock *ctnl, |
848 | struct sk_buff *skb, const struct nlmsghdr *nlh, | |
04ba724b PNA |
849 | const struct nlattr * const nfqa[], |
850 | struct netlink_ext_ack *extack) | |
0597f268 HW |
851 | { |
852 | return -ENOTSUPP; | |
853 | } | |
854 | ||
ca735b3a | 855 | static struct nf_logger nfulnl_logger __read_mostly = { |
0597f268 | 856 | .name = "nfnetlink_log", |
5962815a | 857 | .type = NF_LOG_TYPE_ULOG, |
d4ef3835 | 858 | .logfn = nfulnl_log_packet, |
0597f268 HW |
859 | .me = THIS_MODULE, |
860 | }; | |
861 | ||
fd8281ad PM |
862 | static const struct nla_policy nfula_cfg_policy[NFULA_CFG_MAX+1] = { |
863 | [NFULA_CFG_CMD] = { .len = sizeof(struct nfulnl_msg_config_cmd) }, | |
864 | [NFULA_CFG_MODE] = { .len = sizeof(struct nfulnl_msg_config_mode) }, | |
865 | [NFULA_CFG_TIMEOUT] = { .type = NLA_U32 }, | |
866 | [NFULA_CFG_QTHRESH] = { .type = NLA_U32 }, | |
867 | [NFULA_CFG_NLBUFSIZ] = { .type = NLA_U32 }, | |
868 | [NFULA_CFG_FLAGS] = { .type = NLA_U16 }, | |
0597f268 HW |
869 | }; |
870 | ||
7b8002a1 PNA |
871 | static int nfulnl_recv_config(struct net *net, struct sock *ctnl, |
872 | struct sk_buff *skb, const struct nlmsghdr *nlh, | |
04ba724b PNA |
873 | const struct nlattr * const nfula[], |
874 | struct netlink_ext_ack *extack) | |
0597f268 | 875 | { |
d550d095 | 876 | struct nfgenmsg *nfmsg = nlmsg_data(nlh); |
0597f268 HW |
877 | u_int16_t group_num = ntohs(nfmsg->res_id); |
878 | struct nfulnl_instance *inst; | |
b7047a1c | 879 | struct nfulnl_msg_config_cmd *cmd = NULL; |
9368a53c | 880 | struct nfnl_log_net *log = nfnl_log_pernet(net); |
0597f268 | 881 | int ret = 0; |
c872a2d9 | 882 | u16 flags = 0; |
0597f268 | 883 | |
b7047a1c PM |
884 | if (nfula[NFULA_CFG_CMD]) { |
885 | u_int8_t pf = nfmsg->nfgen_family; | |
886 | cmd = nla_data(nfula[NFULA_CFG_CMD]); | |
887 | ||
888 | /* Commands without queue context */ | |
889 | switch (cmd->command) { | |
890 | case NFULNL_CFG_CMD_PF_BIND: | |
30e0c6a6 | 891 | return nf_log_bind_pf(net, pf, &nfulnl_logger); |
b7047a1c | 892 | case NFULNL_CFG_CMD_PF_UNBIND: |
30e0c6a6 | 893 | nf_log_unbind_pf(net, pf); |
b7047a1c PM |
894 | return 0; |
895 | } | |
896 | } | |
897 | ||
9368a53c | 898 | inst = instance_lookup_get(log, group_num); |
15e47304 | 899 | if (inst && inst->peer_portid != NETLINK_CB(skb).portid) { |
c0506365 PM |
900 | ret = -EPERM; |
901 | goto out_put; | |
902 | } | |
903 | ||
8cbc8708 PN |
904 | /* Check if we support these flags in first place, dependencies should |
905 | * be there too not to break atomicity. | |
906 | */ | |
907 | if (nfula[NFULA_CFG_FLAGS]) { | |
908 | flags = ntohs(nla_get_be16(nfula[NFULA_CFG_FLAGS])); | |
909 | ||
910 | if ((flags & NFULNL_CFG_F_CONNTRACK) && | |
911 | !rcu_access_pointer(nfnl_ct_hook)) { | |
912 | #ifdef CONFIG_MODULES | |
913 | nfnl_unlock(NFNL_SUBSYS_ULOG); | |
914 | request_module("ip_conntrack_netlink"); | |
915 | nfnl_lock(NFNL_SUBSYS_ULOG); | |
916 | if (rcu_access_pointer(nfnl_ct_hook)) { | |
917 | ret = -EAGAIN; | |
918 | goto out_put; | |
919 | } | |
920 | #endif | |
921 | ret = -EOPNOTSUPP; | |
922 | goto out_put; | |
923 | } | |
924 | } | |
925 | ||
b7047a1c | 926 | if (cmd != NULL) { |
0597f268 HW |
927 | switch (cmd->command) { |
928 | case NFULNL_CFG_CMD_BIND: | |
929 | if (inst) { | |
930 | ret = -EBUSY; | |
931 | goto out_put; | |
932 | } | |
933 | ||
9368a53c | 934 | inst = instance_create(net, group_num, |
15e47304 | 935 | NETLINK_CB(skb).portid, |
e32123e5 | 936 | sk_user_ns(NETLINK_CB(skb).sk)); |
baab2ce7 PM |
937 | if (IS_ERR(inst)) { |
938 | ret = PTR_ERR(inst); | |
f414c16c | 939 | goto out; |
0597f268 HW |
940 | } |
941 | break; | |
942 | case NFULNL_CFG_CMD_UNBIND: | |
943 | if (!inst) { | |
944 | ret = -ENODEV; | |
f414c16c | 945 | goto out; |
0597f268 HW |
946 | } |
947 | ||
9368a53c | 948 | instance_destroy(log, inst); |
a49c6503 | 949 | goto out_put; |
0597f268 | 950 | default: |
cd21f0ac | 951 | ret = -ENOTSUPP; |
eb075954 | 952 | goto out_put; |
0597f268 | 953 | } |
336a3b3e PNA |
954 | } else if (!inst) { |
955 | ret = -ENODEV; | |
956 | goto out; | |
0597f268 HW |
957 | } |
958 | ||
df6fb868 | 959 | if (nfula[NFULA_CFG_MODE]) { |
336a3b3e PNA |
960 | struct nfulnl_msg_config_mode *params = |
961 | nla_data(nfula[NFULA_CFG_MODE]); | |
0597f268 HW |
962 | |
963 | nfulnl_set_mode(inst, params->copy_mode, | |
d1208b99 | 964 | ntohl(params->copy_range)); |
0597f268 HW |
965 | } |
966 | ||
df6fb868 | 967 | if (nfula[NFULA_CFG_TIMEOUT]) { |
0dfedd28 | 968 | __be32 timeout = nla_get_be32(nfula[NFULA_CFG_TIMEOUT]); |
0597f268 HW |
969 | |
970 | nfulnl_set_timeout(inst, ntohl(timeout)); | |
971 | } | |
972 | ||
df6fb868 | 973 | if (nfula[NFULA_CFG_NLBUFSIZ]) { |
0dfedd28 | 974 | __be32 nlbufsiz = nla_get_be32(nfula[NFULA_CFG_NLBUFSIZ]); |
0597f268 HW |
975 | |
976 | nfulnl_set_nlbufsiz(inst, ntohl(nlbufsiz)); | |
977 | } | |
978 | ||
df6fb868 | 979 | if (nfula[NFULA_CFG_QTHRESH]) { |
0dfedd28 | 980 | __be32 qthresh = nla_get_be32(nfula[NFULA_CFG_QTHRESH]); |
0597f268 HW |
981 | |
982 | nfulnl_set_qthresh(inst, ntohl(qthresh)); | |
983 | } | |
984 | ||
8cbc8708 | 985 | if (nfula[NFULA_CFG_FLAGS]) |
a29a9a58 | 986 | nfulnl_set_flags(inst, flags); |
0af5f6c1 | 987 | |
0597f268 HW |
988 | out_put: |
989 | instance_put(inst); | |
dd16704e | 990 | out: |
0597f268 HW |
991 | return ret; |
992 | } | |
993 | ||
7c8d4cb4 | 994 | static const struct nfnl_callback nfulnl_cb[NFULNL_MSG_MAX] = { |
0597f268 | 995 | [NFULNL_MSG_PACKET] = { .call = nfulnl_recv_unsupp, |
37d2e7a2 | 996 | .attr_count = NFULA_MAX, }, |
0597f268 | 997 | [NFULNL_MSG_CONFIG] = { .call = nfulnl_recv_config, |
fd8281ad PM |
998 | .attr_count = NFULA_CFG_MAX, |
999 | .policy = nfula_cfg_policy }, | |
0597f268 HW |
1000 | }; |
1001 | ||
7c8d4cb4 | 1002 | static const struct nfnetlink_subsystem nfulnl_subsys = { |
0597f268 HW |
1003 | .name = "log", |
1004 | .subsys_id = NFNL_SUBSYS_ULOG, | |
1005 | .cb_count = NFULNL_MSG_MAX, | |
0597f268 HW |
1006 | .cb = nfulnl_cb, |
1007 | }; | |
1008 | ||
1009 | #ifdef CONFIG_PROC_FS | |
1010 | struct iter_state { | |
9368a53c | 1011 | struct seq_net_private p; |
0597f268 HW |
1012 | unsigned int bucket; |
1013 | }; | |
1014 | ||
9368a53c | 1015 | static struct hlist_node *get_first(struct net *net, struct iter_state *st) |
0597f268 | 1016 | { |
9368a53c | 1017 | struct nfnl_log_net *log; |
0597f268 HW |
1018 | if (!st) |
1019 | return NULL; | |
1020 | ||
9368a53c G |
1021 | log = nfnl_log_pernet(net); |
1022 | ||
0597f268 | 1023 | for (st->bucket = 0; st->bucket < INSTANCE_BUCKETS; st->bucket++) { |
9368a53c G |
1024 | struct hlist_head *head = &log->instance_table[st->bucket]; |
1025 | ||
1026 | if (!hlist_empty(head)) | |
1027 | return rcu_dereference_bh(hlist_first_rcu(head)); | |
0597f268 HW |
1028 | } |
1029 | return NULL; | |
1030 | } | |
1031 | ||
9368a53c G |
1032 | static struct hlist_node *get_next(struct net *net, struct iter_state *st, |
1033 | struct hlist_node *h) | |
0597f268 | 1034 | { |
0e60ebe0 | 1035 | h = rcu_dereference_bh(hlist_next_rcu(h)); |
0597f268 | 1036 | while (!h) { |
9368a53c G |
1037 | struct nfnl_log_net *log; |
1038 | struct hlist_head *head; | |
1039 | ||
0597f268 HW |
1040 | if (++st->bucket >= INSTANCE_BUCKETS) |
1041 | return NULL; | |
1042 | ||
9368a53c G |
1043 | log = nfnl_log_pernet(net); |
1044 | head = &log->instance_table[st->bucket]; | |
1045 | h = rcu_dereference_bh(hlist_first_rcu(head)); | |
0597f268 HW |
1046 | } |
1047 | return h; | |
1048 | } | |
1049 | ||
9368a53c G |
1050 | static struct hlist_node *get_idx(struct net *net, struct iter_state *st, |
1051 | loff_t pos) | |
0597f268 HW |
1052 | { |
1053 | struct hlist_node *head; | |
9368a53c | 1054 | head = get_first(net, st); |
0597f268 HW |
1055 | |
1056 | if (head) | |
9368a53c | 1057 | while (pos && (head = get_next(net, st, head))) |
0597f268 HW |
1058 | pos--; |
1059 | return pos ? NULL : head; | |
1060 | } | |
1061 | ||
9368a53c | 1062 | static void *seq_start(struct seq_file *s, loff_t *pos) |
bed1be20 | 1063 | __acquires(rcu_bh) |
0597f268 | 1064 | { |
bed1be20 | 1065 | rcu_read_lock_bh(); |
9368a53c | 1066 | return get_idx(seq_file_net(s), s->private, *pos); |
0597f268 HW |
1067 | } |
1068 | ||
1069 | static void *seq_next(struct seq_file *s, void *v, loff_t *pos) | |
1070 | { | |
1071 | (*pos)++; | |
9368a53c | 1072 | return get_next(seq_file_net(s), s->private, v); |
0597f268 HW |
1073 | } |
1074 | ||
1075 | static void seq_stop(struct seq_file *s, void *v) | |
bed1be20 | 1076 | __releases(rcu_bh) |
0597f268 | 1077 | { |
bed1be20 | 1078 | rcu_read_unlock_bh(); |
0597f268 HW |
1079 | } |
1080 | ||
1081 | static int seq_show(struct seq_file *s, void *v) | |
1082 | { | |
1083 | const struct nfulnl_instance *inst = v; | |
1084 | ||
20a1d165 | 1085 | seq_printf(s, "%5u %6u %5u %1u %5u %6u %2u\n", |
1ca9e417 JP |
1086 | inst->group_num, |
1087 | inst->peer_portid, inst->qlen, | |
1088 | inst->copy_mode, inst->copy_range, | |
b54ab92b | 1089 | inst->flushtimeout, refcount_read(&inst->use)); |
1ca9e417 JP |
1090 | |
1091 | return 0; | |
0597f268 HW |
1092 | } |
1093 | ||
56b3d975 | 1094 | static const struct seq_operations nful_seq_ops = { |
0597f268 HW |
1095 | .start = seq_start, |
1096 | .next = seq_next, | |
1097 | .stop = seq_stop, | |
1098 | .show = seq_show, | |
1099 | }; | |
0597f268 HW |
1100 | #endif /* PROC_FS */ |
1101 | ||
9368a53c | 1102 | static int __net_init nfnl_log_net_init(struct net *net) |
0597f268 | 1103 | { |
9368a53c G |
1104 | unsigned int i; |
1105 | struct nfnl_log_net *log = nfnl_log_pernet(net); | |
f13f2aee PW |
1106 | #ifdef CONFIG_PROC_FS |
1107 | struct proc_dir_entry *proc; | |
1108 | kuid_t root_uid; | |
1109 | kgid_t root_gid; | |
1110 | #endif | |
601e68e1 | 1111 | |
0597f268 | 1112 | for (i = 0; i < INSTANCE_BUCKETS; i++) |
9368a53c G |
1113 | INIT_HLIST_HEAD(&log->instance_table[i]); |
1114 | spin_lock_init(&log->instances_lock); | |
1115 | ||
1116 | #ifdef CONFIG_PROC_FS | |
c3506372 CH |
1117 | proc = proc_create_net("nfnetlink_log", 0440, net->nf.proc_netfilter, |
1118 | &nful_seq_ops, sizeof(struct iter_state)); | |
f13f2aee | 1119 | if (!proc) |
9368a53c | 1120 | return -ENOMEM; |
f13f2aee PW |
1121 | |
1122 | root_uid = make_kuid(net->user_ns, 0); | |
1123 | root_gid = make_kgid(net->user_ns, 0); | |
1124 | if (uid_valid(root_uid) && gid_valid(root_gid)) | |
1125 | proc_set_user(proc, root_uid, root_gid); | |
9368a53c G |
1126 | #endif |
1127 | return 0; | |
1128 | } | |
1129 | ||
1130 | static void __net_exit nfnl_log_net_exit(struct net *net) | |
1131 | { | |
613d0776 VA |
1132 | struct nfnl_log_net *log = nfnl_log_pernet(net); |
1133 | unsigned int i; | |
1134 | ||
e778f56e | 1135 | #ifdef CONFIG_PROC_FS |
9368a53c | 1136 | remove_proc_entry("nfnetlink_log", net->nf.proc_netfilter); |
e778f56e | 1137 | #endif |
45c2aff6 | 1138 | nf_log_unset(net, &nfulnl_logger); |
613d0776 VA |
1139 | for (i = 0; i < INSTANCE_BUCKETS; i++) |
1140 | WARN_ON_ONCE(!hlist_empty(&log->instance_table[i])); | |
9368a53c G |
1141 | } |
1142 | ||
1143 | static struct pernet_operations nfnl_log_net_ops = { | |
1144 | .init = nfnl_log_net_init, | |
1145 | .exit = nfnl_log_net_exit, | |
1146 | .id = &nfnl_log_net_id, | |
1147 | .size = sizeof(struct nfnl_log_net), | |
1148 | }; | |
1149 | ||
1150 | static int __init nfnetlink_log_init(void) | |
1151 | { | |
3bfe0498 FR |
1152 | int status; |
1153 | ||
1154 | status = register_pernet_subsys(&nfnl_log_net_ops); | |
1155 | if (status < 0) { | |
1156 | pr_err("failed to register pernet ops\n"); | |
1157 | goto out; | |
1158 | } | |
601e68e1 | 1159 | |
0597f268 HW |
1160 | netlink_register_notifier(&nfulnl_rtnl_notifier); |
1161 | status = nfnetlink_subsys_register(&nfulnl_subsys); | |
1162 | if (status < 0) { | |
beacd3e8 | 1163 | pr_err("failed to create netlink socket\n"); |
0597f268 HW |
1164 | goto cleanup_netlink_notifier; |
1165 | } | |
1166 | ||
ca735b3a EL |
1167 | status = nf_log_register(NFPROTO_UNSPEC, &nfulnl_logger); |
1168 | if (status < 0) { | |
beacd3e8 | 1169 | pr_err("failed to register logger\n"); |
ca735b3a EL |
1170 | goto cleanup_subsys; |
1171 | } | |
1172 | ||
0597f268 HW |
1173 | return status; |
1174 | ||
0597f268 | 1175 | cleanup_subsys: |
0597f268 HW |
1176 | nfnetlink_subsys_unregister(&nfulnl_subsys); |
1177 | cleanup_netlink_notifier: | |
1178 | netlink_unregister_notifier(&nfulnl_rtnl_notifier); | |
3bfe0498 FR |
1179 | unregister_pernet_subsys(&nfnl_log_net_ops); |
1180 | out: | |
0597f268 HW |
1181 | return status; |
1182 | } | |
1183 | ||
65b4b4e8 | 1184 | static void __exit nfnetlink_log_fini(void) |
0597f268 | 1185 | { |
32292a7f PM |
1186 | nfnetlink_subsys_unregister(&nfulnl_subsys); |
1187 | netlink_unregister_notifier(&nfulnl_rtnl_notifier); | |
3bfe0498 | 1188 | unregister_pernet_subsys(&nfnl_log_net_ops); |
c83fa196 | 1189 | nf_log_unregister(&nfulnl_logger); |
0597f268 HW |
1190 | } |
1191 | ||
1192 | MODULE_DESCRIPTION("netfilter userspace logging"); | |
1193 | MODULE_AUTHOR("Harald Welte <laforge@netfilter.org>"); | |
1194 | MODULE_LICENSE("GPL"); | |
f682faef | 1195 | MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_ULOG); |
fab4085f PNA |
1196 | MODULE_ALIAS_NF_LOGGER(AF_INET, 1); |
1197 | MODULE_ALIAS_NF_LOGGER(AF_INET6, 1); | |
1198 | MODULE_ALIAS_NF_LOGGER(AF_BRIDGE, 1); | |
2497b846 | 1199 | MODULE_ALIAS_NF_LOGGER(3, 1); /* NFPROTO_ARP */ |
a7647080 | 1200 | MODULE_ALIAS_NF_LOGGER(5, 1); /* NFPROTO_NETDEV */ |
0597f268 | 1201 | |
65b4b4e8 AM |
1202 | module_init(nfnetlink_log_init); |
1203 | module_exit(nfnetlink_log_fini); |