1 | /* Connection tracking via netlink socket. Allows for user space |
2 | * protocol helpers and general trouble making from userspace. |
3 | * |
4 | * (C) 2001 by Jay Schulist <jschlst@samba.org> |
5 | * (C) 2002-2006 by Harald Welte <laforge@gnumonks.org> |
6 | * (C) 2003 by Patrick Mchardy <kaber@trash.net> |
7 | * (C) 2005-2012 by Pablo Neira Ayuso <pablo@netfilter.org> |
8 | * |
9 | * Initial connection tracking via netlink development funded and |
10 | * generally made possible by Network Robots, Inc. (www.networkrobots.com) |
11 | * |
12 | * Further development of this code funded by Astaro AG (http://www.astaro.com) |
13 | * |
14 | * This software may be used and distributed according to the terms |
15 | * of the GNU General Public License, incorporated herein by reference. |
16 | */ |
17 | |
18 | #include <linux/init.h> |
19 | #include <linux/module.h> |
20 | #include <linux/kernel.h> |
21 | #include <linux/rculist.h> |
22 | #include <linux/rculist_nulls.h> |
23 | #include <linux/types.h> |
24 | #include <linux/timer.h> |
25 | #include <linux/security.h> |
26 | #include <linux/skbuff.h> |
27 | #include <linux/errno.h> |
28 | #include <linux/netlink.h> |
29 | #include <linux/spinlock.h> |
30 | #include <linux/interrupt.h> |
31 | #include <linux/slab.h> |
32 | #include <linux/siphash.h> |
33 | |
34 | #include <linux/netfilter.h> |
35 | #include <net/netlink.h> |
36 | #include <net/sock.h> |
37 | #include <net/netfilter/nf_conntrack.h> |
38 | #include <net/netfilter/nf_conntrack_core.h> |
39 | #include <net/netfilter/nf_conntrack_expect.h> |
40 | #include <net/netfilter/nf_conntrack_helper.h> |
41 | #include <net/netfilter/nf_conntrack_seqadj.h> |
42 | #include <net/netfilter/nf_conntrack_l4proto.h> |
43 | #include <net/netfilter/nf_conntrack_tuple.h> |
44 | #include <net/netfilter/nf_conntrack_acct.h> |
45 | #include <net/netfilter/nf_conntrack_zones.h> |
46 | #include <net/netfilter/nf_conntrack_timestamp.h> |
47 | #include <net/netfilter/nf_conntrack_labels.h> |
48 | #include <net/netfilter/nf_conntrack_synproxy.h> |
49 | #if IS_ENABLED(CONFIG_NF_NAT) |
50 | #include <net/netfilter/nf_nat.h> |
51 | #include <net/netfilter/nf_nat_helper.h> |
52 | #endif |
53 | |
54 | #include <linux/netfilter/nfnetlink.h> |
55 | #include <linux/netfilter/nfnetlink_conntrack.h> |
56 | |
57 | #include "nf_internals.h" |
58 | |
59 | MODULE_LICENSE("GPL" ); |
60 | |
61 | struct ctnetlink_list_dump_ctx { |
62 | struct nf_conn *last; |
63 | unsigned int cpu; |
64 | bool done; |
65 | }; |
66 | |
67 | static int ctnetlink_dump_tuples_proto(struct sk_buff *skb, |
68 | const struct nf_conntrack_tuple *tuple, |
69 | const struct nf_conntrack_l4proto *l4proto) |
70 | { |
71 | int ret = 0; |
72 | struct nlattr *nest_parms; |
73 | |
74 | nest_parms = nla_nest_start(skb, attrtype: CTA_TUPLE_PROTO); |
75 | if (!nest_parms) |
76 | goto nla_put_failure; |
77 | if (nla_put_u8(skb, attrtype: CTA_PROTO_NUM, value: tuple->dst.protonum)) |
78 | goto nla_put_failure; |
79 | |
80 | if (likely(l4proto->tuple_to_nlattr)) |
81 | ret = l4proto->tuple_to_nlattr(skb, tuple); |
82 | |
83 | nla_nest_end(skb, start: nest_parms); |
84 | |
85 | return ret; |
86 | |
87 | nla_put_failure: |
88 | return -1; |
89 | } |
90 | |
91 | static int ipv4_tuple_to_nlattr(struct sk_buff *skb, |
92 | const struct nf_conntrack_tuple *tuple) |
93 | { |
94 | if (nla_put_in_addr(skb, attrtype: CTA_IP_V4_SRC, addr: tuple->src.u3.ip) || |
95 | nla_put_in_addr(skb, attrtype: CTA_IP_V4_DST, addr: tuple->dst.u3.ip)) |
96 | return -EMSGSIZE; |
97 | return 0; |
98 | } |
99 | |
100 | static int ipv6_tuple_to_nlattr(struct sk_buff *skb, |
101 | const struct nf_conntrack_tuple *tuple) |
102 | { |
103 | if (nla_put_in6_addr(skb, attrtype: CTA_IP_V6_SRC, addr: &tuple->src.u3.in6) || |
104 | nla_put_in6_addr(skb, attrtype: CTA_IP_V6_DST, addr: &tuple->dst.u3.in6)) |
105 | return -EMSGSIZE; |
106 | return 0; |
107 | } |
108 | |
109 | static int ctnetlink_dump_tuples_ip(struct sk_buff *skb, |
110 | const struct nf_conntrack_tuple *tuple) |
111 | { |
112 | int ret = 0; |
113 | struct nlattr *nest_parms; |
114 | |
115 | nest_parms = nla_nest_start(skb, attrtype: CTA_TUPLE_IP); |
116 | if (!nest_parms) |
117 | goto nla_put_failure; |
118 | |
119 | switch (tuple->src.l3num) { |
120 | case NFPROTO_IPV4: |
121 | ret = ipv4_tuple_to_nlattr(skb, tuple); |
122 | break; |
123 | case NFPROTO_IPV6: |
124 | ret = ipv6_tuple_to_nlattr(skb, tuple); |
125 | break; |
126 | } |
127 | |
128 | nla_nest_end(skb, start: nest_parms); |
129 | |
130 | return ret; |
131 | |
132 | nla_put_failure: |
133 | return -1; |
134 | } |
135 | |
136 | static int ctnetlink_dump_tuples(struct sk_buff *skb, |
137 | const struct nf_conntrack_tuple *tuple) |
138 | { |
139 | const struct nf_conntrack_l4proto *l4proto; |
140 | int ret; |
141 | |
142 | rcu_read_lock(); |
143 | ret = ctnetlink_dump_tuples_ip(skb, tuple); |
144 | |
145 | if (ret >= 0) { |
146 | l4proto = nf_ct_l4proto_find(l4proto: tuple->dst.protonum); |
147 | ret = ctnetlink_dump_tuples_proto(skb, tuple, l4proto); |
148 | } |
149 | rcu_read_unlock(); |
150 | return ret; |
151 | } |
152 | |
153 | static int ctnetlink_dump_zone_id(struct sk_buff *skb, int attrtype, |
154 | const struct nf_conntrack_zone *zone, int dir) |
155 | { |
156 | if (zone->id == NF_CT_DEFAULT_ZONE_ID || zone->dir != dir) |
157 | return 0; |
158 | if (nla_put_be16(skb, attrtype, htons(zone->id))) |
159 | goto nla_put_failure; |
160 | return 0; |
161 | |
162 | nla_put_failure: |
163 | return -1; |
164 | } |
165 | |
166 | static int ctnetlink_dump_status(struct sk_buff *skb, const struct nf_conn *ct) |
167 | { |
168 | if (nla_put_be32(skb, attrtype: CTA_STATUS, htonl(ct->status))) |
169 | goto nla_put_failure; |
170 | return 0; |
171 | |
172 | nla_put_failure: |
173 | return -1; |
174 | } |
175 | |
176 | static int ctnetlink_dump_timeout(struct sk_buff *skb, const struct nf_conn *ct, |
177 | bool skip_zero) |
178 | { |
179 | long timeout; |
180 | |
181 | if (nf_ct_is_confirmed(ct)) |
182 | timeout = nf_ct_expires(ct) / HZ; |
183 | else |
184 | timeout = ct->timeout / HZ; |
185 | |
186 | if (skip_zero && timeout == 0) |
187 | return 0; |
188 | |
189 | if (nla_put_be32(skb, attrtype: CTA_TIMEOUT, htonl(timeout))) |
190 | goto nla_put_failure; |
191 | return 0; |
192 | |
193 | nla_put_failure: |
194 | return -1; |
195 | } |
196 | |
197 | static int ctnetlink_dump_protoinfo(struct sk_buff *skb, struct nf_conn *ct, |
198 | bool destroy) |
199 | { |
200 | const struct nf_conntrack_l4proto *l4proto; |
201 | struct nlattr *nest_proto; |
202 | int ret; |
203 | |
204 | l4proto = nf_ct_l4proto_find(l4proto: nf_ct_protonum(ct)); |
205 | if (!l4proto->to_nlattr) |
206 | return 0; |
207 | |
208 | nest_proto = nla_nest_start(skb, attrtype: CTA_PROTOINFO); |
209 | if (!nest_proto) |
210 | goto nla_put_failure; |
211 | |
212 | ret = l4proto->to_nlattr(skb, nest_proto, ct, destroy); |
213 | |
214 | nla_nest_end(skb, start: nest_proto); |
215 | |
216 | return ret; |
217 | |
218 | nla_put_failure: |
219 | return -1; |
220 | } |
221 | |
222 | static int ctnetlink_dump_helpinfo(struct sk_buff *skb, |
223 | const struct nf_conn *ct) |
224 | { |
225 | struct nlattr *nest_helper; |
226 | const struct nf_conn_help *help = nfct_help(ct); |
227 | struct nf_conntrack_helper *helper; |
228 | |
229 | if (!help) |
230 | return 0; |
231 | |
232 | rcu_read_lock(); |
233 | helper = rcu_dereference(help->helper); |
234 | if (!helper) |
235 | goto out; |
236 | |
237 | nest_helper = nla_nest_start(skb, attrtype: CTA_HELP); |
238 | if (!nest_helper) |
239 | goto nla_put_failure; |
240 | if (nla_put_string(skb, attrtype: CTA_HELP_NAME, str: helper->name)) |
241 | goto nla_put_failure; |
242 | |
243 | if (helper->to_nlattr) |
244 | helper->to_nlattr(skb, ct); |
245 | |
246 | nla_nest_end(skb, start: nest_helper); |
247 | out: |
248 | rcu_read_unlock(); |
249 | return 0; |
250 | |
251 | nla_put_failure: |
252 | rcu_read_unlock(); |
253 | return -1; |
254 | } |
255 | |
256 | static int |
257 | dump_counters(struct sk_buff *skb, struct nf_conn_acct *acct, |
258 | enum ip_conntrack_dir dir, int type) |
259 | { |
260 | enum ctattr_type attr = dir ? CTA_COUNTERS_REPLY: CTA_COUNTERS_ORIG; |
261 | struct nf_conn_counter *counter = acct->counter; |
262 | struct nlattr *nest_count; |
263 | u64 pkts, bytes; |
264 | |
265 | if (type == IPCTNL_MSG_CT_GET_CTRZERO) { |
266 | pkts = atomic64_xchg(v: &counter[dir].packets, new: 0); |
267 | bytes = atomic64_xchg(v: &counter[dir].bytes, new: 0); |
268 | } else { |
269 | pkts = atomic64_read(v: &counter[dir].packets); |
270 | bytes = atomic64_read(v: &counter[dir].bytes); |
271 | } |
272 | |
273 | nest_count = nla_nest_start(skb, attrtype: attr); |
274 | if (!nest_count) |
275 | goto nla_put_failure; |
276 | |
277 | if (nla_put_be64(skb, attrtype: CTA_COUNTERS_PACKETS, cpu_to_be64(pkts), |
278 | padattr: CTA_COUNTERS_PAD) || |
279 | nla_put_be64(skb, attrtype: CTA_COUNTERS_BYTES, cpu_to_be64(bytes), |
280 | padattr: CTA_COUNTERS_PAD)) |
281 | goto nla_put_failure; |
282 | |
283 | nla_nest_end(skb, start: nest_count); |
284 | |
285 | return 0; |
286 | |
287 | nla_put_failure: |
288 | return -1; |
289 | } |
290 | |
291 | static int |
292 | ctnetlink_dump_acct(struct sk_buff *skb, const struct nf_conn *ct, int type) |
293 | { |
294 | struct nf_conn_acct *acct = nf_conn_acct_find(ct); |
295 | |
296 | if (!acct) |
297 | return 0; |
298 | |
299 | if (dump_counters(skb, acct, dir: IP_CT_DIR_ORIGINAL, type) < 0) |
300 | return -1; |
301 | if (dump_counters(skb, acct, dir: IP_CT_DIR_REPLY, type) < 0) |
302 | return -1; |
303 | |
304 | return 0; |
305 | } |
306 | |
307 | static int |
308 | ctnetlink_dump_timestamp(struct sk_buff *skb, const struct nf_conn *ct) |
309 | { |
310 | struct nlattr *nest_count; |
311 | const struct nf_conn_tstamp *tstamp; |
312 | |
313 | tstamp = nf_conn_tstamp_find(ct); |
314 | if (!tstamp) |
315 | return 0; |
316 | |
317 | nest_count = nla_nest_start(skb, attrtype: CTA_TIMESTAMP); |
318 | if (!nest_count) |
319 | goto nla_put_failure; |
320 | |
321 | if (nla_put_be64(skb, attrtype: CTA_TIMESTAMP_START, cpu_to_be64(tstamp->start), |
322 | padattr: CTA_TIMESTAMP_PAD) || |
323 | (tstamp->stop != 0 && nla_put_be64(skb, attrtype: CTA_TIMESTAMP_STOP, |
324 | cpu_to_be64(tstamp->stop), |
325 | padattr: CTA_TIMESTAMP_PAD))) |
326 | goto nla_put_failure; |
327 | nla_nest_end(skb, start: nest_count); |
328 | |
329 | return 0; |
330 | |
331 | nla_put_failure: |
332 | return -1; |
333 | } |
334 | |
335 | #ifdef CONFIG_NF_CONNTRACK_MARK |
336 | static int ctnetlink_dump_mark(struct sk_buff *skb, const struct nf_conn *ct, |
337 | bool dump) |
338 | { |
339 | u32 mark = READ_ONCE(ct->mark); |
340 | |
341 | if (!mark && !dump) |
342 | return 0; |
343 | |
344 | if (nla_put_be32(skb, attrtype: CTA_MARK, htonl(mark))) |
345 | goto nla_put_failure; |
346 | return 0; |
347 | |
348 | nla_put_failure: |
349 | return -1; |
350 | } |
351 | #else |
352 | #define ctnetlink_dump_mark(a, b, c) (0) |
353 | #endif |
354 | |
355 | #ifdef CONFIG_NF_CONNTRACK_SECMARK |
356 | static int ctnetlink_dump_secctx(struct sk_buff *skb, const struct nf_conn *ct) |
357 | { |
358 | struct nlattr *nest_secctx; |
359 | int len, ret; |
360 | char *secctx; |
361 | |
362 | ret = security_secid_to_secctx(secid: ct->secmark, secdata: &secctx, seclen: &len); |
363 | if (ret) |
364 | return 0; |
365 | |
366 | ret = -1; |
367 | nest_secctx = nla_nest_start(skb, attrtype: CTA_SECCTX); |
368 | if (!nest_secctx) |
369 | goto nla_put_failure; |
370 | |
371 | if (nla_put_string(skb, attrtype: CTA_SECCTX_NAME, str: secctx)) |
372 | goto nla_put_failure; |
373 | nla_nest_end(skb, start: nest_secctx); |
374 | |
375 | ret = 0; |
376 | nla_put_failure: |
377 | security_release_secctx(secdata: secctx, seclen: len); |
378 | return ret; |
379 | } |
380 | #else |
381 | #define ctnetlink_dump_secctx(a, b) (0) |
382 | #endif |
383 | |
384 | #ifdef CONFIG_NF_CONNTRACK_LABELS |
385 | static inline int ctnetlink_label_size(const struct nf_conn *ct) |
386 | { |
387 | struct nf_conn_labels *labels = nf_ct_labels_find(ct); |
388 | |
389 | if (!labels) |
390 | return 0; |
391 | return nla_total_size(payload: sizeof(labels->bits)); |
392 | } |
393 | |
394 | static int |
395 | ctnetlink_dump_labels(struct sk_buff *skb, const struct nf_conn *ct) |
396 | { |
397 | struct nf_conn_labels *labels = nf_ct_labels_find(ct); |
398 | unsigned int i; |
399 | |
400 | if (!labels) |
401 | return 0; |
402 | |
403 | i = 0; |
404 | do { |
405 | if (labels->bits[i] != 0) |
406 | return nla_put(skb, attrtype: CTA_LABELS, attrlen: sizeof(labels->bits), |
407 | data: labels->bits); |
408 | i++; |
409 | } while (i < ARRAY_SIZE(labels->bits)); |
410 | |
411 | return 0; |
412 | } |
413 | #else |
414 | #define ctnetlink_dump_labels(a, b) (0) |
415 | #define ctnetlink_label_size(a) (0) |
416 | #endif |
417 | |
418 | #define master_tuple(ct) &(ct->master->tuplehash[IP_CT_DIR_ORIGINAL].tuple) |
419 | |
420 | static int ctnetlink_dump_master(struct sk_buff *skb, const struct nf_conn *ct) |
421 | { |
422 | struct nlattr *nest_parms; |
423 | |
424 | if (!(ct->status & IPS_EXPECTED)) |
425 | return 0; |
426 | |
427 | nest_parms = nla_nest_start(skb, attrtype: CTA_TUPLE_MASTER); |
428 | if (!nest_parms) |
429 | goto nla_put_failure; |
430 | if (ctnetlink_dump_tuples(skb, master_tuple(ct)) < 0) |
431 | goto nla_put_failure; |
432 | nla_nest_end(skb, start: nest_parms); |
433 | |
434 | return 0; |
435 | |
436 | nla_put_failure: |
437 | return -1; |
438 | } |
439 | |
440 | static int |
441 | dump_ct_seq_adj(struct sk_buff *skb, const struct nf_ct_seqadj *seq, int type) |
442 | { |
443 | struct nlattr *nest_parms; |
444 | |
445 | nest_parms = nla_nest_start(skb, attrtype: type); |
446 | if (!nest_parms) |
447 | goto nla_put_failure; |
448 | |
449 | if (nla_put_be32(skb, attrtype: CTA_SEQADJ_CORRECTION_POS, |
450 | htonl(seq->correction_pos)) || |
451 | nla_put_be32(skb, attrtype: CTA_SEQADJ_OFFSET_BEFORE, |
452 | htonl(seq->offset_before)) || |
453 | nla_put_be32(skb, attrtype: CTA_SEQADJ_OFFSET_AFTER, |
454 | htonl(seq->offset_after))) |
455 | goto nla_put_failure; |
456 | |
457 | nla_nest_end(skb, start: nest_parms); |
458 | |
459 | return 0; |
460 | |
461 | nla_put_failure: |
462 | return -1; |
463 | } |
464 | |
465 | static int ctnetlink_dump_ct_seq_adj(struct sk_buff *skb, struct nf_conn *ct) |
466 | { |
467 | struct nf_conn_seqadj *seqadj = nfct_seqadj(ct); |
468 | struct nf_ct_seqadj *seq; |
469 | |
470 | if (!(ct->status & IPS_SEQ_ADJUST) || !seqadj) |
471 | return 0; |
472 | |
473 | spin_lock_bh(lock: &ct->lock); |
474 | seq = &seqadj->seq[IP_CT_DIR_ORIGINAL]; |
475 | if (dump_ct_seq_adj(skb, seq, type: CTA_SEQ_ADJ_ORIG) == -1) |
476 | goto err; |
477 | |
478 | seq = &seqadj->seq[IP_CT_DIR_REPLY]; |
479 | if (dump_ct_seq_adj(skb, seq, type: CTA_SEQ_ADJ_REPLY) == -1) |
480 | goto err; |
481 | |
482 | spin_unlock_bh(lock: &ct->lock); |
483 | return 0; |
484 | err: |
485 | spin_unlock_bh(lock: &ct->lock); |
486 | return -1; |
487 | } |
488 | |
489 | static int ctnetlink_dump_ct_synproxy(struct sk_buff *skb, struct nf_conn *ct) |
490 | { |
491 | struct nf_conn_synproxy *synproxy = nfct_synproxy(ct); |
492 | struct nlattr *nest_parms; |
493 | |
494 | if (!synproxy) |
495 | return 0; |
496 | |
497 | nest_parms = nla_nest_start(skb, attrtype: CTA_SYNPROXY); |
498 | if (!nest_parms) |
499 | goto nla_put_failure; |
500 | |
501 | if (nla_put_be32(skb, attrtype: CTA_SYNPROXY_ISN, htonl(synproxy->isn)) || |
502 | nla_put_be32(skb, attrtype: CTA_SYNPROXY_ITS, htonl(synproxy->its)) || |
503 | nla_put_be32(skb, attrtype: CTA_SYNPROXY_TSOFF, htonl(synproxy->tsoff))) |
504 | goto nla_put_failure; |
505 | |
506 | nla_nest_end(skb, start: nest_parms); |
507 | |
508 | return 0; |
509 | |
510 | nla_put_failure: |
511 | return -1; |
512 | } |
513 | |
514 | static int ctnetlink_dump_id(struct sk_buff *skb, const struct nf_conn *ct) |
515 | { |
516 | __be32 id = (__force __be32)nf_ct_get_id(ct); |
517 | |
518 | if (nla_put_be32(skb, attrtype: CTA_ID, value: id)) |
519 | goto nla_put_failure; |
520 | return 0; |
521 | |
522 | nla_put_failure: |
523 | return -1; |
524 | } |
525 | |
526 | static int ctnetlink_dump_use(struct sk_buff *skb, const struct nf_conn *ct) |
527 | { |
528 | if (nla_put_be32(skb, attrtype: CTA_USE, htonl(refcount_read(&ct->ct_general.use)))) |
529 | goto nla_put_failure; |
530 | return 0; |
531 | |
532 | nla_put_failure: |
533 | return -1; |
534 | } |
535 | |
536 | /* all these functions access ct->ext. Caller must either hold a reference |
537 | * on ct or prevent its deletion by holding either the bucket spinlock or |
538 | * pcpu dying list lock. |
539 | */ |
540 | static int ctnetlink_dump_extinfo(struct sk_buff *skb, |
541 | struct nf_conn *ct, u32 type) |
542 | { |
543 | if (ctnetlink_dump_acct(skb, ct, type) < 0 || |
544 | ctnetlink_dump_timestamp(skb, ct) < 0 || |
545 | ctnetlink_dump_helpinfo(skb, ct) < 0 || |
546 | ctnetlink_dump_labels(skb, ct) < 0 || |
547 | ctnetlink_dump_ct_seq_adj(skb, ct) < 0 || |
548 | ctnetlink_dump_ct_synproxy(skb, ct) < 0) |
549 | return -1; |
550 | |
551 | return 0; |
552 | } |
553 | |
554 | static int ctnetlink_dump_info(struct sk_buff *skb, struct nf_conn *ct) |
555 | { |
556 | if (ctnetlink_dump_status(skb, ct) < 0 || |
557 | ctnetlink_dump_mark(skb, ct, dump: true) < 0 || |
558 | ctnetlink_dump_secctx(skb, ct) < 0 || |
559 | ctnetlink_dump_id(skb, ct) < 0 || |
560 | ctnetlink_dump_use(skb, ct) < 0 || |
561 | ctnetlink_dump_master(skb, ct) < 0) |
562 | return -1; |
563 | |
564 | if (!test_bit(IPS_OFFLOAD_BIT, &ct->status) && |
565 | (ctnetlink_dump_timeout(skb, ct, skip_zero: false) < 0 || |
566 | ctnetlink_dump_protoinfo(skb, ct, destroy: false) < 0)) |
567 | return -1; |
568 | |
569 | return 0; |
570 | } |
571 | |
572 | static int |
573 | ctnetlink_fill_info(struct sk_buff *skb, u32 portid, u32 seq, u32 type, |
574 | struct nf_conn *ct, bool extinfo, unsigned int flags) |
575 | { |
576 | const struct nf_conntrack_zone *zone; |
577 | struct nlmsghdr *nlh; |
578 | struct nlattr *nest_parms; |
579 | unsigned int event; |
580 | |
581 | if (portid) |
582 | flags |= NLM_F_MULTI; |
583 | event = nfnl_msg_type(NFNL_SUBSYS_CTNETLINK, msg_type: IPCTNL_MSG_CT_NEW); |
584 | nlh = nfnl_msg_put(skb, portid, seq, type: event, flags, family: nf_ct_l3num(ct), |
585 | NFNETLINK_V0, res_id: 0); |
586 | if (!nlh) |
587 | goto nlmsg_failure; |
588 | |
589 | zone = nf_ct_zone(ct); |
590 | |
591 | nest_parms = nla_nest_start(skb, attrtype: CTA_TUPLE_ORIG); |
592 | if (!nest_parms) |
593 | goto nla_put_failure; |
594 | if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_ORIGINAL)) < 0) |
595 | goto nla_put_failure; |
596 | if (ctnetlink_dump_zone_id(skb, attrtype: CTA_TUPLE_ZONE, zone, |
597 | NF_CT_ZONE_DIR_ORIG) < 0) |
598 | goto nla_put_failure; |
599 | nla_nest_end(skb, start: nest_parms); |
600 | |
601 | nest_parms = nla_nest_start(skb, attrtype: CTA_TUPLE_REPLY); |
602 | if (!nest_parms) |
603 | goto nla_put_failure; |
604 | if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_REPLY)) < 0) |
605 | goto nla_put_failure; |
606 | if (ctnetlink_dump_zone_id(skb, attrtype: CTA_TUPLE_ZONE, zone, |
607 | NF_CT_ZONE_DIR_REPL) < 0) |
608 | goto nla_put_failure; |
609 | nla_nest_end(skb, start: nest_parms); |
610 | |
611 | if (ctnetlink_dump_zone_id(skb, attrtype: CTA_ZONE, zone, |
612 | NF_CT_DEFAULT_ZONE_DIR) < 0) |
613 | goto nla_put_failure; |
614 | |
615 | if (ctnetlink_dump_info(skb, ct) < 0) |
616 | goto nla_put_failure; |
617 | if (extinfo && ctnetlink_dump_extinfo(skb, ct, type) < 0) |
618 | goto nla_put_failure; |
619 | |
620 | nlmsg_end(skb, nlh); |
621 | return skb->len; |
622 | |
623 | nlmsg_failure: |
624 | nla_put_failure: |
625 | nlmsg_cancel(skb, nlh); |
626 | return -1; |
627 | } |
628 | |
629 | static const struct nla_policy cta_ip_nla_policy[CTA_IP_MAX + 1] = { |
630 | [CTA_IP_V4_SRC] = { .type = NLA_U32 }, |
631 | [CTA_IP_V4_DST] = { .type = NLA_U32 }, |
632 | [CTA_IP_V6_SRC] = { .len = sizeof(__be32) * 4 }, |
633 | [CTA_IP_V6_DST] = { .len = sizeof(__be32) * 4 }, |
634 | }; |
635 | |
636 | #if defined(CONFIG_NETFILTER_NETLINK_GLUE_CT) || defined(CONFIG_NF_CONNTRACK_EVENTS) |
637 | static size_t ctnetlink_proto_size(const struct nf_conn *ct) |
638 | { |
639 | const struct nf_conntrack_l4proto *l4proto; |
640 | size_t len, len4 = 0; |
641 | |
642 | len = nla_policy_len(cta_ip_nla_policy, CTA_IP_MAX + 1); |
643 | len *= 3u; /* ORIG, REPLY, MASTER */ |
644 | |
645 | l4proto = nf_ct_l4proto_find(l4proto: nf_ct_protonum(ct)); |
646 | len += l4proto->nlattr_size; |
647 | if (l4proto->nlattr_tuple_size) { |
648 | len4 = l4proto->nlattr_tuple_size(); |
649 | len4 *= 3u; /* ORIG, REPLY, MASTER */ |
650 | } |
651 | |
652 | return len + len4; |
653 | } |
654 | #endif |
655 | |
656 | static inline size_t ctnetlink_acct_size(const struct nf_conn *ct) |
657 | { |
658 | if (!nf_ct_ext_exist(ct, id: NF_CT_EXT_ACCT)) |
659 | return 0; |
660 | return 2 * nla_total_size(payload: 0) /* CTA_COUNTERS_ORIG|REPL */ |
661 | + 2 * nla_total_size_64bit(payload: sizeof(uint64_t)) /* CTA_COUNTERS_PACKETS */ |
662 | + 2 * nla_total_size_64bit(payload: sizeof(uint64_t)) /* CTA_COUNTERS_BYTES */ |
663 | ; |
664 | } |
665 | |
666 | static inline int ctnetlink_secctx_size(const struct nf_conn *ct) |
667 | { |
668 | #ifdef CONFIG_NF_CONNTRACK_SECMARK |
669 | int len, ret; |
670 | |
671 | ret = security_secid_to_secctx(secid: ct->secmark, NULL, seclen: &len); |
672 | if (ret) |
673 | return 0; |
674 | |
675 | return nla_total_size(payload: 0) /* CTA_SECCTX */ |
676 | + nla_total_size(payload: sizeof(char) * len); /* CTA_SECCTX_NAME */ |
677 | #else |
678 | return 0; |
679 | #endif |
680 | } |
681 | |
682 | static inline size_t ctnetlink_timestamp_size(const struct nf_conn *ct) |
683 | { |
684 | #ifdef CONFIG_NF_CONNTRACK_TIMESTAMP |
685 | if (!nf_ct_ext_exist(ct, id: NF_CT_EXT_TSTAMP)) |
686 | return 0; |
687 | return nla_total_size(payload: 0) + 2 * nla_total_size_64bit(payload: sizeof(uint64_t)); |
688 | #else |
689 | return 0; |
690 | #endif |
691 | } |
692 | |
693 | #ifdef CONFIG_NF_CONNTRACK_EVENTS |
694 | static size_t ctnetlink_nlmsg_size(const struct nf_conn *ct) |
695 | { |
696 | return NLMSG_ALIGN(sizeof(struct nfgenmsg)) |
697 | + 3 * nla_total_size(payload: 0) /* CTA_TUPLE_ORIG|REPL|MASTER */ |
698 | + 3 * nla_total_size(payload: 0) /* CTA_TUPLE_IP */ |
699 | + 3 * nla_total_size(payload: 0) /* CTA_TUPLE_PROTO */ |
700 | + 3 * nla_total_size(payload: sizeof(u_int8_t)) /* CTA_PROTO_NUM */ |
701 | + nla_total_size(payload: sizeof(u_int32_t)) /* CTA_ID */ |
702 | + nla_total_size(payload: sizeof(u_int32_t)) /* CTA_STATUS */ |
703 | + ctnetlink_acct_size(ct) |
704 | + ctnetlink_timestamp_size(ct) |
705 | + nla_total_size(payload: sizeof(u_int32_t)) /* CTA_TIMEOUT */ |
706 | + nla_total_size(payload: 0) /* CTA_PROTOINFO */ |
707 | + nla_total_size(payload: 0) /* CTA_HELP */ |
708 | + nla_total_size(NF_CT_HELPER_NAME_LEN) /* CTA_HELP_NAME */ |
709 | + ctnetlink_secctx_size(ct) |
710 | #if IS_ENABLED(CONFIG_NF_NAT) |
711 | + 2 * nla_total_size(payload: 0) /* CTA_NAT_SEQ_ADJ_ORIG|REPL */ |
712 | + 6 * nla_total_size(payload: sizeof(u_int32_t)) /* CTA_NAT_SEQ_OFFSET */ |
713 | #endif |
714 | #ifdef CONFIG_NF_CONNTRACK_MARK |
715 | + nla_total_size(payload: sizeof(u_int32_t)) /* CTA_MARK */ |
716 | #endif |
717 | #ifdef CONFIG_NF_CONNTRACK_ZONES |
718 | + nla_total_size(payload: sizeof(u_int16_t)) /* CTA_ZONE|CTA_TUPLE_ZONE */ |
719 | #endif |
720 | + ctnetlink_proto_size(ct) |
721 | + ctnetlink_label_size(ct) |
722 | ; |
723 | } |
724 | |
725 | static int |
726 | ctnetlink_conntrack_event(unsigned int events, const struct nf_ct_event *item) |
727 | { |
728 | const struct nf_conntrack_zone *zone; |
729 | struct net *net; |
730 | struct nlmsghdr *nlh; |
731 | struct nlattr *nest_parms; |
732 | struct nf_conn *ct = item->ct; |
733 | struct sk_buff *skb; |
734 | unsigned int type; |
735 | unsigned int flags = 0, group; |
736 | int err; |
737 | |
738 | if (events & (1 << IPCT_DESTROY)) { |
739 | type = IPCTNL_MSG_CT_DELETE; |
740 | group = NFNLGRP_CONNTRACK_DESTROY; |
741 | } else if (events & ((1 << IPCT_NEW) | (1 << IPCT_RELATED))) { |
742 | type = IPCTNL_MSG_CT_NEW; |
743 | flags = NLM_F_CREATE|NLM_F_EXCL; |
744 | group = NFNLGRP_CONNTRACK_NEW; |
745 | } else if (events) { |
746 | type = IPCTNL_MSG_CT_NEW; |
747 | group = NFNLGRP_CONNTRACK_UPDATE; |
748 | } else |
749 | return 0; |
750 | |
751 | net = nf_ct_net(ct); |
752 | if (!item->report && !nfnetlink_has_listeners(net, group)) |
753 | return 0; |
754 | |
755 | skb = nlmsg_new(payload: ctnetlink_nlmsg_size(ct), GFP_ATOMIC); |
756 | if (skb == NULL) |
757 | goto errout; |
758 | |
759 | type = nfnl_msg_type(NFNL_SUBSYS_CTNETLINK, msg_type: type); |
760 | nlh = nfnl_msg_put(skb, portid: item->portid, seq: 0, type, flags, family: nf_ct_l3num(ct), |
761 | NFNETLINK_V0, res_id: 0); |
762 | if (!nlh) |
763 | goto nlmsg_failure; |
764 | |
765 | zone = nf_ct_zone(ct); |
766 | |
767 | nest_parms = nla_nest_start(skb, attrtype: CTA_TUPLE_ORIG); |
768 | if (!nest_parms) |
769 | goto nla_put_failure; |
770 | if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_ORIGINAL)) < 0) |
771 | goto nla_put_failure; |
772 | if (ctnetlink_dump_zone_id(skb, attrtype: CTA_TUPLE_ZONE, zone, |
773 | NF_CT_ZONE_DIR_ORIG) < 0) |
774 | goto nla_put_failure; |
775 | nla_nest_end(skb, start: nest_parms); |
776 | |
777 | nest_parms = nla_nest_start(skb, attrtype: CTA_TUPLE_REPLY); |
778 | if (!nest_parms) |
779 | goto nla_put_failure; |
780 | if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_REPLY)) < 0) |
781 | goto nla_put_failure; |
782 | if (ctnetlink_dump_zone_id(skb, attrtype: CTA_TUPLE_ZONE, zone, |
783 | NF_CT_ZONE_DIR_REPL) < 0) |
784 | goto nla_put_failure; |
785 | nla_nest_end(skb, start: nest_parms); |
786 | |
787 | if (ctnetlink_dump_zone_id(skb, attrtype: CTA_ZONE, zone, |
788 | NF_CT_DEFAULT_ZONE_DIR) < 0) |
789 | goto nla_put_failure; |
790 | |
791 | if (ctnetlink_dump_id(skb, ct) < 0) |
792 | goto nla_put_failure; |
793 | |
794 | if (ctnetlink_dump_status(skb, ct) < 0) |
795 | goto nla_put_failure; |
796 | |
797 | if (events & (1 << IPCT_DESTROY)) { |
798 | if (ctnetlink_dump_timeout(skb, ct, skip_zero: true) < 0) |
799 | goto nla_put_failure; |
800 | |
801 | if (ctnetlink_dump_acct(skb, ct, type) < 0 || |
802 | ctnetlink_dump_timestamp(skb, ct) < 0 || |
803 | ctnetlink_dump_protoinfo(skb, ct, destroy: true) < 0) |
804 | goto nla_put_failure; |
805 | } else { |
806 | if (ctnetlink_dump_timeout(skb, ct, skip_zero: false) < 0) |
807 | goto nla_put_failure; |
808 | |
809 | if (events & (1 << IPCT_PROTOINFO) && |
810 | ctnetlink_dump_protoinfo(skb, ct, destroy: false) < 0) |
811 | goto nla_put_failure; |
812 | |
813 | if ((events & (1 << IPCT_HELPER) || nfct_help(ct)) |
814 | && ctnetlink_dump_helpinfo(skb, ct) < 0) |
815 | goto nla_put_failure; |
816 | |
817 | #ifdef CONFIG_NF_CONNTRACK_SECMARK |
818 | if ((events & (1 << IPCT_SECMARK) || ct->secmark) |
819 | && ctnetlink_dump_secctx(skb, ct) < 0) |
820 | goto nla_put_failure; |
821 | #endif |
822 | if (events & (1 << IPCT_LABEL) && |
823 | ctnetlink_dump_labels(skb, ct) < 0) |
824 | goto nla_put_failure; |
825 | |
826 | if (events & (1 << IPCT_RELATED) && |
827 | ctnetlink_dump_master(skb, ct) < 0) |
828 | goto nla_put_failure; |
829 | |
830 | if (events & (1 << IPCT_SEQADJ) && |
831 | ctnetlink_dump_ct_seq_adj(skb, ct) < 0) |
832 | goto nla_put_failure; |
833 | |
834 | if (events & (1 << IPCT_SYNPROXY) && |
835 | ctnetlink_dump_ct_synproxy(skb, ct) < 0) |
836 | goto nla_put_failure; |
837 | } |
838 | |
839 | #ifdef CONFIG_NF_CONNTRACK_MARK |
840 | if (ctnetlink_dump_mark(skb, ct, dump: events & (1 << IPCT_MARK))) |
841 | goto nla_put_failure; |
842 | #endif |
843 | nlmsg_end(skb, nlh); |
844 | err = nfnetlink_send(skb, net, portid: item->portid, group, echo: item->report, |
845 | GFP_ATOMIC); |
846 | if (err == -ENOBUFS || err == -EAGAIN) |
847 | return -ENOBUFS; |
848 | |
849 | return 0; |
850 | |
851 | nla_put_failure: |
852 | nlmsg_cancel(skb, nlh); |
853 | nlmsg_failure: |
854 | kfree_skb(skb); |
855 | errout: |
856 | if (nfnetlink_set_err(net, portid: 0, group, error: -ENOBUFS) > 0) |
857 | return -ENOBUFS; |
858 | |
859 | return 0; |
860 | } |
861 | #endif /* CONFIG_NF_CONNTRACK_EVENTS */ |
862 | |
863 | static int ctnetlink_done(struct netlink_callback *cb) |
864 | { |
865 | if (cb->args[1]) |
866 | nf_ct_put(ct: (struct nf_conn *)cb->args[1]); |
867 | kfree(objp: cb->data); |
868 | return 0; |
869 | } |
870 | |
871 | struct ctnetlink_filter_u32 { |
872 | u32 val; |
873 | u32 mask; |
874 | }; |
875 | |
876 | struct ctnetlink_filter { |
877 | u8 family; |
878 | |
879 | u_int32_t orig_flags; |
880 | u_int32_t reply_flags; |
881 | |
882 | struct nf_conntrack_tuple orig; |
883 | struct nf_conntrack_tuple reply; |
884 | struct nf_conntrack_zone zone; |
885 | |
886 | struct ctnetlink_filter_u32 mark; |
887 | struct ctnetlink_filter_u32 status; |
888 | }; |
889 | |
890 | static const struct nla_policy cta_filter_nla_policy[CTA_FILTER_MAX + 1] = { |
891 | [CTA_FILTER_ORIG_FLAGS] = { .type = NLA_U32 }, |
892 | [CTA_FILTER_REPLY_FLAGS] = { .type = NLA_U32 }, |
893 | }; |
894 | |
895 | static int ctnetlink_parse_filter(const struct nlattr *attr, |
896 | struct ctnetlink_filter *filter) |
897 | { |
898 | struct nlattr *tb[CTA_FILTER_MAX + 1]; |
899 | int ret = 0; |
900 | |
901 | ret = nla_parse_nested(tb, CTA_FILTER_MAX, nla: attr, policy: cta_filter_nla_policy, |
902 | NULL); |
903 | if (ret) |
904 | return ret; |
905 | |
906 | if (tb[CTA_FILTER_ORIG_FLAGS]) { |
907 | filter->orig_flags = nla_get_u32(nla: tb[CTA_FILTER_ORIG_FLAGS]); |
908 | if (filter->orig_flags & ~CTA_FILTER_F_ALL) |
909 | return -EOPNOTSUPP; |
910 | } |
911 | |
912 | if (tb[CTA_FILTER_REPLY_FLAGS]) { |
913 | filter->reply_flags = nla_get_u32(nla: tb[CTA_FILTER_REPLY_FLAGS]); |
914 | if (filter->reply_flags & ~CTA_FILTER_F_ALL) |
915 | return -EOPNOTSUPP; |
916 | } |
917 | |
918 | return 0; |
919 | } |
920 | |
921 | static int ctnetlink_parse_zone(const struct nlattr *attr, |
922 | struct nf_conntrack_zone *zone); |
923 | static int ctnetlink_parse_tuple_filter(const struct nlattr * const cda[], |
924 | struct nf_conntrack_tuple *tuple, |
925 | u32 type, u_int8_t l3num, |
926 | struct nf_conntrack_zone *zone, |
927 | u_int32_t flags); |
928 | |
929 | static int ctnetlink_filter_parse_mark(struct ctnetlink_filter_u32 *mark, |
930 | const struct nlattr * const cda[]) |
931 | { |
932 | #ifdef CONFIG_NF_CONNTRACK_MARK |
933 | if (cda[CTA_MARK]) { |
934 | mark->val = ntohl(nla_get_be32(cda[CTA_MARK])); |
935 | |
936 | if (cda[CTA_MARK_MASK]) |
937 | mark->mask = ntohl(nla_get_be32(cda[CTA_MARK_MASK])); |
938 | else |
939 | mark->mask = 0xffffffff; |
940 | } else if (cda[CTA_MARK_MASK]) { |
941 | return -EINVAL; |
942 | } |
943 | #endif |
944 | return 0; |
945 | } |
946 | |
947 | static int ctnetlink_filter_parse_status(struct ctnetlink_filter_u32 *status, |
948 | const struct nlattr * const cda[]) |
949 | { |
950 | if (cda[CTA_STATUS]) { |
951 | status->val = ntohl(nla_get_be32(cda[CTA_STATUS])); |
952 | if (cda[CTA_STATUS_MASK]) |
953 | status->mask = ntohl(nla_get_be32(cda[CTA_STATUS_MASK])); |
954 | else |
955 | status->mask = status->val; |
956 | |
957 | /* status->val == 0? always true, else always false. */ |
958 | if (status->mask == 0) |
959 | return -EINVAL; |
960 | } else if (cda[CTA_STATUS_MASK]) { |
961 | return -EINVAL; |
962 | } |
963 | |
964 | /* CTA_STATUS is NLA_U32, if this fires UAPI needs to be extended */ |
965 | BUILD_BUG_ON(__IPS_MAX_BIT >= 32); |
966 | return 0; |
967 | } |
968 | |
969 | static struct ctnetlink_filter * |
970 | ctnetlink_alloc_filter(const struct nlattr * const cda[], u8 family) |
971 | { |
972 | struct ctnetlink_filter *filter; |
973 | int err; |
974 | |
975 | #ifndef CONFIG_NF_CONNTRACK_MARK |
976 | if (cda[CTA_MARK] || cda[CTA_MARK_MASK]) |
977 | return ERR_PTR(-EOPNOTSUPP); |
978 | #endif |
979 | |
980 | filter = kzalloc(size: sizeof(*filter), GFP_KERNEL); |
981 | if (filter == NULL) |
982 | return ERR_PTR(error: -ENOMEM); |
983 | |
984 | filter->family = family; |
985 | |
986 | err = ctnetlink_filter_parse_mark(mark: &filter->mark, cda); |
987 | if (err) |
988 | goto err_filter; |
989 | |
990 | err = ctnetlink_filter_parse_status(status: &filter->status, cda); |
991 | if (err) |
992 | goto err_filter; |
993 | |
994 | if (!cda[CTA_FILTER]) |
995 | return filter; |
996 | |
997 | err = ctnetlink_parse_zone(attr: cda[CTA_ZONE], zone: &filter->zone); |
998 | if (err < 0) |
999 | goto err_filter; |
1000 | |
1001 | err = ctnetlink_parse_filter(attr: cda[CTA_FILTER], filter); |
1002 | if (err < 0) |
1003 | goto err_filter; |
1004 | |
1005 | if (filter->orig_flags) { |
1006 | if (!cda[CTA_TUPLE_ORIG]) { |
1007 | err = -EINVAL; |
1008 | goto err_filter; |
1009 | } |
1010 | |
1011 | err = ctnetlink_parse_tuple_filter(cda, tuple: &filter->orig, |
1012 | type: CTA_TUPLE_ORIG, |
1013 | l3num: filter->family, |
1014 | zone: &filter->zone, |
1015 | flags: filter->orig_flags); |
1016 | if (err < 0) |
1017 | goto err_filter; |
1018 | } |
1019 | |
1020 | if (filter->reply_flags) { |
1021 | if (!cda[CTA_TUPLE_REPLY]) { |
1022 | err = -EINVAL; |
1023 | goto err_filter; |
1024 | } |
1025 | |
1026 | err = ctnetlink_parse_tuple_filter(cda, tuple: &filter->reply, |
1027 | type: CTA_TUPLE_REPLY, |
1028 | l3num: filter->family, |
1029 | zone: &filter->zone, |
1030 | flags: filter->reply_flags); |
1031 | if (err < 0) |
1032 | goto err_filter; |
1033 | } |
1034 | |
1035 | return filter; |
1036 | |
1037 | err_filter: |
1038 | kfree(objp: filter); |
1039 | |
1040 | return ERR_PTR(error: err); |
1041 | } |
1042 | |
1043 | static bool ctnetlink_needs_filter(u8 family, const struct nlattr * const *cda) |
1044 | { |
1045 | return family || cda[CTA_MARK] || cda[CTA_FILTER] || cda[CTA_STATUS]; |
1046 | } |
1047 | |
1048 | static int ctnetlink_start(struct netlink_callback *cb) |
1049 | { |
1050 | const struct nlattr * const *cda = cb->data; |
1051 | struct ctnetlink_filter *filter = NULL; |
1052 | struct nfgenmsg *nfmsg = nlmsg_data(nlh: cb->nlh); |
1053 | u8 family = nfmsg->nfgen_family; |
1054 | |
1055 | if (ctnetlink_needs_filter(family, cda)) { |
1056 | filter = ctnetlink_alloc_filter(cda, family); |
1057 | if (IS_ERR(ptr: filter)) |
1058 | return PTR_ERR(ptr: filter); |
1059 | } |
1060 | |
1061 | cb->data = filter; |
1062 | return 0; |
1063 | } |
1064 | |
1065 | static int ctnetlink_filter_match_tuple(struct nf_conntrack_tuple *filter_tuple, |
1066 | struct nf_conntrack_tuple *ct_tuple, |
1067 | u_int32_t flags, int family) |
1068 | { |
1069 | switch (family) { |
1070 | case NFPROTO_IPV4: |
1071 | if ((flags & CTA_FILTER_FLAG(CTA_IP_SRC)) && |
1072 | filter_tuple->src.u3.ip != ct_tuple->src.u3.ip) |
1073 | return 0; |
1074 | |
1075 | if ((flags & CTA_FILTER_FLAG(CTA_IP_DST)) && |
1076 | filter_tuple->dst.u3.ip != ct_tuple->dst.u3.ip) |
1077 | return 0; |
1078 | break; |
1079 | case NFPROTO_IPV6: |
1080 | if ((flags & CTA_FILTER_FLAG(CTA_IP_SRC)) && |
1081 | !ipv6_addr_cmp(a1: &filter_tuple->src.u3.in6, |
1082 | a2: &ct_tuple->src.u3.in6)) |
1083 | return 0; |
1084 | |
1085 | if ((flags & CTA_FILTER_FLAG(CTA_IP_DST)) && |
1086 | !ipv6_addr_cmp(a1: &filter_tuple->dst.u3.in6, |
1087 | a2: &ct_tuple->dst.u3.in6)) |
1088 | return 0; |
1089 | break; |
1090 | } |
1091 | |
1092 | if ((flags & CTA_FILTER_FLAG(CTA_PROTO_NUM)) && |
1093 | filter_tuple->dst.protonum != ct_tuple->dst.protonum) |
1094 | return 0; |
1095 | |
1096 | switch (ct_tuple->dst.protonum) { |
1097 | case IPPROTO_TCP: |
1098 | case IPPROTO_UDP: |
1099 | if ((flags & CTA_FILTER_FLAG(CTA_PROTO_SRC_PORT)) && |
1100 | filter_tuple->src.u.tcp.port != ct_tuple->src.u.tcp.port) |
1101 | return 0; |
1102 | |
1103 | if ((flags & CTA_FILTER_FLAG(CTA_PROTO_DST_PORT)) && |
1104 | filter_tuple->dst.u.tcp.port != ct_tuple->dst.u.tcp.port) |
1105 | return 0; |
1106 | break; |
1107 | case IPPROTO_ICMP: |
1108 | if ((flags & CTA_FILTER_FLAG(CTA_PROTO_ICMP_TYPE)) && |
1109 | filter_tuple->dst.u.icmp.type != ct_tuple->dst.u.icmp.type) |
1110 | return 0; |
1111 | if ((flags & CTA_FILTER_FLAG(CTA_PROTO_ICMP_CODE)) && |
1112 | filter_tuple->dst.u.icmp.code != ct_tuple->dst.u.icmp.code) |
1113 | return 0; |
1114 | if ((flags & CTA_FILTER_FLAG(CTA_PROTO_ICMP_ID)) && |
1115 | filter_tuple->src.u.icmp.id != ct_tuple->src.u.icmp.id) |
1116 | return 0; |
1117 | break; |
1118 | case IPPROTO_ICMPV6: |
1119 | if ((flags & CTA_FILTER_FLAG(CTA_PROTO_ICMPV6_TYPE)) && |
1120 | filter_tuple->dst.u.icmp.type != ct_tuple->dst.u.icmp.type) |
1121 | return 0; |
1122 | if ((flags & CTA_FILTER_FLAG(CTA_PROTO_ICMPV6_CODE)) && |
1123 | filter_tuple->dst.u.icmp.code != ct_tuple->dst.u.icmp.code) |
1124 | return 0; |
1125 | if ((flags & CTA_FILTER_FLAG(CTA_PROTO_ICMPV6_ID)) && |
1126 | filter_tuple->src.u.icmp.id != ct_tuple->src.u.icmp.id) |
1127 | return 0; |
1128 | break; |
1129 | } |
1130 | |
1131 | return 1; |
1132 | } |
1133 | |
1134 | static int ctnetlink_filter_match(struct nf_conn *ct, void *data) |
1135 | { |
1136 | struct ctnetlink_filter *filter = data; |
1137 | struct nf_conntrack_tuple *tuple; |
1138 | u32 status; |
1139 | |
1140 | if (filter == NULL) |
1141 | goto out; |
1142 | |
1143 | /* Match entries of a given L3 protocol number. |
1144 | * If it is not specified, ie. l3proto == 0, |
1145 | * then match everything. |
1146 | */ |
1147 | if (filter->family && nf_ct_l3num(ct) != filter->family) |
1148 | goto ignore_entry; |
1149 | |
1150 | if (filter->orig_flags) { |
1151 | tuple = nf_ct_tuple(ct, IP_CT_DIR_ORIGINAL); |
1152 | if (!ctnetlink_filter_match_tuple(filter_tuple: &filter->orig, ct_tuple: tuple, |
1153 | flags: filter->orig_flags, |
1154 | family: filter->family)) |
1155 | goto ignore_entry; |
1156 | } |
1157 | |
1158 | if (filter->reply_flags) { |
1159 | tuple = nf_ct_tuple(ct, IP_CT_DIR_REPLY); |
1160 | if (!ctnetlink_filter_match_tuple(filter_tuple: &filter->reply, ct_tuple: tuple, |
1161 | flags: filter->reply_flags, |
1162 | family: filter->family)) |
1163 | goto ignore_entry; |
1164 | } |
1165 | |
1166 | #ifdef CONFIG_NF_CONNTRACK_MARK |
1167 | if ((READ_ONCE(ct->mark) & filter->mark.mask) != filter->mark.val) |
1168 | goto ignore_entry; |
1169 | #endif |
1170 | status = (u32)READ_ONCE(ct->status); |
1171 | if ((status & filter->status.mask) != filter->status.val) |
1172 | goto ignore_entry; |
1173 | |
1174 | out: |
1175 | return 1; |
1176 | |
1177 | ignore_entry: |
1178 | return 0; |
1179 | } |
1180 | |
1181 | static int |
1182 | ctnetlink_dump_table(struct sk_buff *skb, struct netlink_callback *cb) |
1183 | { |
1184 | unsigned int flags = cb->data ? NLM_F_DUMP_FILTERED : 0; |
1185 | struct net *net = sock_net(sk: skb->sk); |
1186 | struct nf_conn *ct, *last; |
1187 | struct nf_conntrack_tuple_hash *h; |
1188 | struct hlist_nulls_node *n; |
1189 | struct nf_conn *nf_ct_evict[8]; |
1190 | int res, i; |
1191 | spinlock_t *lockp; |
1192 | |
1193 | last = (struct nf_conn *)cb->args[1]; |
1194 | i = 0; |
1195 | |
1196 | local_bh_disable(); |
1197 | for (; cb->args[0] < nf_conntrack_htable_size; cb->args[0]++) { |
1198 | restart: |
1199 | while (i) { |
1200 | i--; |
1201 | if (nf_ct_should_gc(ct: nf_ct_evict[i])) |
1202 | nf_ct_kill(ct: nf_ct_evict[i]); |
1203 | nf_ct_put(ct: nf_ct_evict[i]); |
1204 | } |
1205 | |
1206 | lockp = &nf_conntrack_locks[cb->args[0] % CONNTRACK_LOCKS]; |
1207 | nf_conntrack_lock(lock: lockp); |
1208 | if (cb->args[0] >= nf_conntrack_htable_size) { |
1209 | spin_unlock(lock: lockp); |
1210 | goto out; |
1211 | } |
1212 | hlist_nulls_for_each_entry(h, n, &nf_conntrack_hash[cb->args[0]], |
1213 | hnnode) { |
1214 | ct = nf_ct_tuplehash_to_ctrack(hash: h); |
1215 | if (nf_ct_is_expired(ct)) { |
1216 | /* need to defer nf_ct_kill() until lock is released */ |
1217 | if (i < ARRAY_SIZE(nf_ct_evict) && |
1218 | refcount_inc_not_zero(r: &ct->ct_general.use)) |
1219 | nf_ct_evict[i++] = ct; |
1220 | continue; |
1221 | } |
1222 | |
1223 | if (!net_eq(net1: net, net2: nf_ct_net(ct))) |
1224 | continue; |
1225 | |
1226 | if (NF_CT_DIRECTION(h) != IP_CT_DIR_ORIGINAL) |
1227 | continue; |
1228 | |
1229 | if (cb->args[1]) { |
1230 | if (ct != last) |
1231 | continue; |
1232 | cb->args[1] = 0; |
1233 | } |
1234 | if (!ctnetlink_filter_match(ct, data: cb->data)) |
1235 | continue; |
1236 | |
1237 | res = |
1238 | ctnetlink_fill_info(skb, NETLINK_CB(cb->skb).portid, |
1239 | seq: cb->nlh->nlmsg_seq, |
1240 | NFNL_MSG_TYPE(cb->nlh->nlmsg_type), |
1241 | ct, extinfo: true, flags); |
1242 | if (res < 0) { |
1243 | nf_conntrack_get(nfct: &ct->ct_general); |
1244 | cb->args[1] = (unsigned long)ct; |
1245 | spin_unlock(lock: lockp); |
1246 | goto out; |
1247 | } |
1248 | } |
1249 | spin_unlock(lock: lockp); |
1250 | if (cb->args[1]) { |
1251 | cb->args[1] = 0; |
1252 | goto restart; |
1253 | } |
1254 | } |
1255 | out: |
1256 | local_bh_enable(); |
1257 | if (last) { |
1258 | /* nf ct hash resize happened, now clear the leftover. */ |
1259 | if ((struct nf_conn *)cb->args[1] == last) |
1260 | cb->args[1] = 0; |
1261 | |
1262 | nf_ct_put(ct: last); |
1263 | } |
1264 | |
1265 | while (i) { |
1266 | i--; |
1267 | if (nf_ct_should_gc(ct: nf_ct_evict[i])) |
1268 | nf_ct_kill(ct: nf_ct_evict[i]); |
1269 | nf_ct_put(ct: nf_ct_evict[i]); |
1270 | } |
1271 | |
1272 | return skb->len; |
1273 | } |
1274 | |
1275 | static int ipv4_nlattr_to_tuple(struct nlattr *tb[], |
1276 | struct nf_conntrack_tuple *t, |
1277 | u_int32_t flags) |
1278 | { |
1279 | if (flags & CTA_FILTER_FLAG(CTA_IP_SRC)) { |
1280 | if (!tb[CTA_IP_V4_SRC]) |
1281 | return -EINVAL; |
1282 | |
1283 | t->src.u3.ip = nla_get_in_addr(nla: tb[CTA_IP_V4_SRC]); |
1284 | } |
1285 | |
1286 | if (flags & CTA_FILTER_FLAG(CTA_IP_DST)) { |
1287 | if (!tb[CTA_IP_V4_DST]) |
1288 | return -EINVAL; |
1289 | |
1290 | t->dst.u3.ip = nla_get_in_addr(nla: tb[CTA_IP_V4_DST]); |
1291 | } |
1292 | |
1293 | return 0; |
1294 | } |
1295 | |
1296 | static int ipv6_nlattr_to_tuple(struct nlattr *tb[], |
1297 | struct nf_conntrack_tuple *t, |
1298 | u_int32_t flags) |
1299 | { |
1300 | if (flags & CTA_FILTER_FLAG(CTA_IP_SRC)) { |
1301 | if (!tb[CTA_IP_V6_SRC]) |
1302 | return -EINVAL; |
1303 | |
1304 | t->src.u3.in6 = nla_get_in6_addr(nla: tb[CTA_IP_V6_SRC]); |
1305 | } |
1306 | |
1307 | if (flags & CTA_FILTER_FLAG(CTA_IP_DST)) { |
1308 | if (!tb[CTA_IP_V6_DST]) |
1309 | return -EINVAL; |
1310 | |
1311 | t->dst.u3.in6 = nla_get_in6_addr(nla: tb[CTA_IP_V6_DST]); |
1312 | } |
1313 | |
1314 | return 0; |
1315 | } |
1316 | |
1317 | static int ctnetlink_parse_tuple_ip(struct nlattr *attr, |
1318 | struct nf_conntrack_tuple *tuple, |
1319 | u_int32_t flags) |
1320 | { |
1321 | struct nlattr *tb[CTA_IP_MAX+1]; |
1322 | int ret = 0; |
1323 | |
1324 | ret = nla_parse_nested_deprecated(tb, CTA_IP_MAX, nla: attr, |
1325 | policy: cta_ip_nla_policy, NULL); |
1326 | if (ret < 0) |
1327 | return ret; |
1328 | |
1329 | switch (tuple->src.l3num) { |
1330 | case NFPROTO_IPV4: |
1331 | ret = ipv4_nlattr_to_tuple(tb, t: tuple, flags); |
1332 | break; |
1333 | case NFPROTO_IPV6: |
1334 | ret = ipv6_nlattr_to_tuple(tb, t: tuple, flags); |
1335 | break; |
1336 | } |
1337 | |
1338 | return ret; |
1339 | } |
1340 | |
1341 | static const struct nla_policy proto_nla_policy[CTA_PROTO_MAX+1] = { |
1342 | [CTA_PROTO_NUM] = { .type = NLA_U8 }, |
1343 | }; |
1344 | |
1345 | static int ctnetlink_parse_tuple_proto(struct nlattr *attr, |
1346 | struct nf_conntrack_tuple *tuple, |
1347 | u_int32_t flags) |
1348 | { |
1349 | const struct nf_conntrack_l4proto *l4proto; |
1350 | struct nlattr *tb[CTA_PROTO_MAX+1]; |
1351 | int ret = 0; |
1352 | |
1353 | ret = nla_parse_nested_deprecated(tb, CTA_PROTO_MAX, nla: attr, |
1354 | policy: proto_nla_policy, NULL); |
1355 | if (ret < 0) |
1356 | return ret; |
1357 | |
1358 | if (!(flags & CTA_FILTER_FLAG(CTA_PROTO_NUM))) |
1359 | return 0; |
1360 | |
1361 | if (!tb[CTA_PROTO_NUM]) |
1362 | return -EINVAL; |
1363 | |
1364 | tuple->dst.protonum = nla_get_u8(nla: tb[CTA_PROTO_NUM]); |
1365 | |
1366 | rcu_read_lock(); |
1367 | l4proto = nf_ct_l4proto_find(l4proto: tuple->dst.protonum); |
1368 | |
1369 | if (likely(l4proto->nlattr_to_tuple)) { |
1370 | ret = nla_validate_nested_deprecated(start: attr, CTA_PROTO_MAX, |
1371 | policy: l4proto->nla_policy, |
1372 | NULL); |
1373 | if (ret == 0) |
1374 | ret = l4proto->nlattr_to_tuple(tb, tuple, flags); |
1375 | } |
1376 | |
1377 | rcu_read_unlock(); |
1378 | |
1379 | return ret; |
1380 | } |
1381 | |
1382 | static int |
1383 | ctnetlink_parse_zone(const struct nlattr *attr, |
1384 | struct nf_conntrack_zone *zone) |
1385 | { |
1386 | nf_ct_zone_init(zone, NF_CT_DEFAULT_ZONE_ID, |
1387 | NF_CT_DEFAULT_ZONE_DIR, flags: 0); |
1388 | #ifdef CONFIG_NF_CONNTRACK_ZONES |
1389 | if (attr) |
1390 | zone->id = ntohs(nla_get_be16(attr)); |
1391 | #else |
1392 | if (attr) |
1393 | return -EOPNOTSUPP; |
1394 | #endif |
1395 | return 0; |
1396 | } |
1397 | |
1398 | static int |
1399 | ctnetlink_parse_tuple_zone(struct nlattr *attr, enum ctattr_type type, |
1400 | struct nf_conntrack_zone *zone) |
1401 | { |
1402 | int ret; |
1403 | |
1404 | if (zone->id != NF_CT_DEFAULT_ZONE_ID) |
1405 | return -EINVAL; |
1406 | |
1407 | ret = ctnetlink_parse_zone(attr, zone); |
1408 | if (ret < 0) |
1409 | return ret; |
1410 | |
1411 | if (type == CTA_TUPLE_REPLY) |
1412 | zone->dir = NF_CT_ZONE_DIR_REPL; |
1413 | else |
1414 | zone->dir = NF_CT_ZONE_DIR_ORIG; |
1415 | |
1416 | return 0; |
1417 | } |
1418 | |
1419 | static const struct nla_policy tuple_nla_policy[CTA_TUPLE_MAX+1] = { |
1420 | [CTA_TUPLE_IP] = { .type = NLA_NESTED }, |
1421 | [CTA_TUPLE_PROTO] = { .type = NLA_NESTED }, |
1422 | [CTA_TUPLE_ZONE] = { .type = NLA_U16 }, |
1423 | }; |
1424 | |
1425 | #define CTA_FILTER_F_ALL_CTA_PROTO \ |
1426 | (CTA_FILTER_F_CTA_PROTO_SRC_PORT | \ |
1427 | CTA_FILTER_F_CTA_PROTO_DST_PORT | \ |
1428 | CTA_FILTER_F_CTA_PROTO_ICMP_TYPE | \ |
1429 | CTA_FILTER_F_CTA_PROTO_ICMP_CODE | \ |
1430 | CTA_FILTER_F_CTA_PROTO_ICMP_ID | \ |
1431 | CTA_FILTER_F_CTA_PROTO_ICMPV6_TYPE | \ |
1432 | CTA_FILTER_F_CTA_PROTO_ICMPV6_CODE | \ |
1433 | CTA_FILTER_F_CTA_PROTO_ICMPV6_ID) |
1434 | |
1435 | static int |
1436 | ctnetlink_parse_tuple_filter(const struct nlattr * const cda[], |
1437 | struct nf_conntrack_tuple *tuple, u32 type, |
1438 | u_int8_t l3num, struct nf_conntrack_zone *zone, |
1439 | u_int32_t flags) |
1440 | { |
1441 | struct nlattr *tb[CTA_TUPLE_MAX+1]; |
1442 | int err; |
1443 | |
1444 | memset(tuple, 0, sizeof(*tuple)); |
1445 | |
1446 | err = nla_parse_nested_deprecated(tb, CTA_TUPLE_MAX, nla: cda[type], |
1447 | policy: tuple_nla_policy, NULL); |
1448 | if (err < 0) |
1449 | return err; |
1450 | |
1451 | if (l3num != NFPROTO_IPV4 && l3num != NFPROTO_IPV6) |
1452 | return -EOPNOTSUPP; |
1453 | tuple->src.l3num = l3num; |
1454 | |
1455 | if (flags & CTA_FILTER_FLAG(CTA_IP_DST) || |
1456 | flags & CTA_FILTER_FLAG(CTA_IP_SRC)) { |
1457 | if (!tb[CTA_TUPLE_IP]) |
1458 | return -EINVAL; |
1459 | |
1460 | err = ctnetlink_parse_tuple_ip(attr: tb[CTA_TUPLE_IP], tuple, flags); |
1461 | if (err < 0) |
1462 | return err; |
1463 | } |
1464 | |
1465 | if (flags & CTA_FILTER_FLAG(CTA_PROTO_NUM)) { |
1466 | if (!tb[CTA_TUPLE_PROTO]) |
1467 | return -EINVAL; |
1468 | |
1469 | err = ctnetlink_parse_tuple_proto(attr: tb[CTA_TUPLE_PROTO], tuple, flags); |
1470 | if (err < 0) |
1471 | return err; |
1472 | } else if (flags & CTA_FILTER_FLAG(ALL_CTA_PROTO)) { |
1473 | /* Can't manage proto flags without a protonum */ |
1474 | return -EINVAL; |
1475 | } |
1476 | |
1477 | if ((flags & CTA_FILTER_FLAG(CTA_TUPLE_ZONE)) && tb[CTA_TUPLE_ZONE]) { |
1478 | if (!zone) |
1479 | return -EINVAL; |
1480 | |
1481 | err = ctnetlink_parse_tuple_zone(attr: tb[CTA_TUPLE_ZONE], |
1482 | type, zone); |
1483 | if (err < 0) |
1484 | return err; |
1485 | } |
1486 | |
1487 | /* orig and expect tuples get DIR_ORIGINAL */ |
1488 | if (type == CTA_TUPLE_REPLY) |
1489 | tuple->dst.dir = IP_CT_DIR_REPLY; |
1490 | else |
1491 | tuple->dst.dir = IP_CT_DIR_ORIGINAL; |
1492 | |
1493 | return 0; |
1494 | } |
1495 | |
1496 | static int |
1497 | ctnetlink_parse_tuple(const struct nlattr * const cda[], |
1498 | struct nf_conntrack_tuple *tuple, u32 type, |
1499 | u_int8_t l3num, struct nf_conntrack_zone *zone) |
1500 | { |
1501 | return ctnetlink_parse_tuple_filter(cda, tuple, type, l3num, zone, |
1502 | CTA_FILTER_FLAG(ALL)); |
1503 | } |
1504 | |
1505 | static const struct nla_policy help_nla_policy[CTA_HELP_MAX+1] = { |
1506 | [CTA_HELP_NAME] = { .type = NLA_NUL_STRING, |
1507 | .len = NF_CT_HELPER_NAME_LEN - 1 }, |
1508 | }; |
1509 | |
1510 | static int ctnetlink_parse_help(const struct nlattr *attr, char **helper_name, |
1511 | struct nlattr **helpinfo) |
1512 | { |
1513 | int err; |
1514 | struct nlattr *tb[CTA_HELP_MAX+1]; |
1515 | |
1516 | err = nla_parse_nested_deprecated(tb, CTA_HELP_MAX, nla: attr, |
1517 | policy: help_nla_policy, NULL); |
1518 | if (err < 0) |
1519 | return err; |
1520 | |
1521 | if (!tb[CTA_HELP_NAME]) |
1522 | return -EINVAL; |
1523 | |
1524 | *helper_name = nla_data(nla: tb[CTA_HELP_NAME]); |
1525 | |
1526 | if (tb[CTA_HELP_INFO]) |
1527 | *helpinfo = tb[CTA_HELP_INFO]; |
1528 | |
1529 | return 0; |
1530 | } |
1531 | |
1532 | static const struct nla_policy ct_nla_policy[CTA_MAX+1] = { |
1533 | [CTA_TUPLE_ORIG] = { .type = NLA_NESTED }, |
1534 | [CTA_TUPLE_REPLY] = { .type = NLA_NESTED }, |
1535 | [CTA_STATUS] = { .type = NLA_U32 }, |
1536 | [CTA_PROTOINFO] = { .type = NLA_NESTED }, |
1537 | [CTA_HELP] = { .type = NLA_NESTED }, |
1538 | [CTA_NAT_SRC] = { .type = NLA_NESTED }, |
1539 | [CTA_TIMEOUT] = { .type = NLA_U32 }, |
1540 | [CTA_MARK] = { .type = NLA_U32 }, |
1541 | [CTA_ID] = { .type = NLA_U32 }, |
1542 | [CTA_NAT_DST] = { .type = NLA_NESTED }, |
1543 | [CTA_TUPLE_MASTER] = { .type = NLA_NESTED }, |
1544 | [CTA_NAT_SEQ_ADJ_ORIG] = { .type = NLA_NESTED }, |
1545 | [CTA_NAT_SEQ_ADJ_REPLY] = { .type = NLA_NESTED }, |
1546 | [CTA_ZONE] = { .type = NLA_U16 }, |
1547 | [CTA_MARK_MASK] = { .type = NLA_U32 }, |
1548 | [CTA_LABELS] = { .type = NLA_BINARY, |
1549 | .len = NF_CT_LABELS_MAX_SIZE }, |
1550 | [CTA_LABELS_MASK] = { .type = NLA_BINARY, |
1551 | .len = NF_CT_LABELS_MAX_SIZE }, |
1552 | [CTA_FILTER] = { .type = NLA_NESTED }, |
1553 | [CTA_STATUS_MASK] = { .type = NLA_U32 }, |
1554 | }; |
1555 | |
1556 | static int ctnetlink_flush_iterate(struct nf_conn *ct, void *data) |
1557 | { |
1558 | return ctnetlink_filter_match(ct, data); |
1559 | } |
1560 | |
1561 | static int ctnetlink_flush_conntrack(struct net *net, |
1562 | const struct nlattr * const cda[], |
1563 | u32 portid, int report, u8 family) |
1564 | { |
1565 | struct ctnetlink_filter *filter = NULL; |
1566 | struct nf_ct_iter_data iter = { |
1567 | .net = net, |
1568 | .portid = portid, |
1569 | .report = report, |
1570 | }; |
1571 | |
1572 | if (ctnetlink_needs_filter(family, cda)) { |
1573 | if (cda[CTA_FILTER]) |
1574 | return -EOPNOTSUPP; |
1575 | |
1576 | filter = ctnetlink_alloc_filter(cda, family); |
1577 | if (IS_ERR(ptr: filter)) |
1578 | return PTR_ERR(ptr: filter); |
1579 | |
1580 | iter.data = filter; |
1581 | } |
1582 | |
1583 | nf_ct_iterate_cleanup_net(iter: ctnetlink_flush_iterate, iter_data: &iter); |
1584 | kfree(objp: filter); |
1585 | |
1586 | return 0; |
1587 | } |
1588 | |
1589 | static int ctnetlink_del_conntrack(struct sk_buff *skb, |
1590 | const struct nfnl_info *info, |
1591 | const struct nlattr * const cda[]) |
1592 | { |
1593 | u8 family = info->nfmsg->nfgen_family; |
1594 | struct nf_conntrack_tuple_hash *h; |
1595 | struct nf_conntrack_tuple tuple; |
1596 | struct nf_conntrack_zone zone; |
1597 | struct nf_conn *ct; |
1598 | int err; |
1599 | |
1600 | err = ctnetlink_parse_zone(attr: cda[CTA_ZONE], zone: &zone); |
1601 | if (err < 0) |
1602 | return err; |
1603 | |
1604 | if (cda[CTA_TUPLE_ORIG]) |
1605 | err = ctnetlink_parse_tuple(cda, tuple: &tuple, type: CTA_TUPLE_ORIG, |
1606 | l3num: family, zone: &zone); |
1607 | else if (cda[CTA_TUPLE_REPLY]) |
1608 | err = ctnetlink_parse_tuple(cda, tuple: &tuple, type: CTA_TUPLE_REPLY, |
1609 | l3num: family, zone: &zone); |
1610 | else { |
1611 | u_int8_t u3 = info->nfmsg->version ? family : AF_UNSPEC; |
1612 | |
1613 | return ctnetlink_flush_conntrack(net: info->net, cda, |
1614 | NETLINK_CB(skb).portid, |
1615 | report: nlmsg_report(nlh: info->nlh), family: u3); |
1616 | } |
1617 | |
1618 | if (err < 0) |
1619 | return err; |
1620 | |
1621 | h = nf_conntrack_find_get(net: info->net, zone: &zone, tuple: &tuple); |
1622 | if (!h) |
1623 | return -ENOENT; |
1624 | |
1625 | ct = nf_ct_tuplehash_to_ctrack(hash: h); |
1626 | |
1627 | if (cda[CTA_ID]) { |
1628 | __be32 id = nla_get_be32(nla: cda[CTA_ID]); |
1629 | |
1630 | if (id != (__force __be32)nf_ct_get_id(ct)) { |
1631 | nf_ct_put(ct); |
1632 | return -ENOENT; |
1633 | } |
1634 | } |
1635 | |
1636 | nf_ct_delete(ct, NETLINK_CB(skb).portid, report: nlmsg_report(nlh: info->nlh)); |
1637 | nf_ct_put(ct); |
1638 | |
1639 | return 0; |
1640 | } |
1641 | |
1642 | static int ctnetlink_get_conntrack(struct sk_buff *skb, |
1643 | const struct nfnl_info *info, |
1644 | const struct nlattr * const cda[]) |
1645 | { |
1646 | u_int8_t u3 = info->nfmsg->nfgen_family; |
1647 | struct nf_conntrack_tuple_hash *h; |
1648 | struct nf_conntrack_tuple tuple; |
1649 | struct nf_conntrack_zone zone; |
1650 | struct sk_buff *skb2; |
1651 | struct nf_conn *ct; |
1652 | int err; |
1653 | |
1654 | if (info->nlh->nlmsg_flags & NLM_F_DUMP) { |
1655 | struct netlink_dump_control c = { |
1656 | .start = ctnetlink_start, |
1657 | .dump = ctnetlink_dump_table, |
1658 | .done = ctnetlink_done, |
1659 | .data = (void *)cda, |
1660 | }; |
1661 | |
1662 | return netlink_dump_start(ssk: info->sk, skb, nlh: info->nlh, control: &c); |
1663 | } |
1664 | |
1665 | err = ctnetlink_parse_zone(attr: cda[CTA_ZONE], zone: &zone); |
1666 | if (err < 0) |
1667 | return err; |
1668 | |
1669 | if (cda[CTA_TUPLE_ORIG]) |
1670 | err = ctnetlink_parse_tuple(cda, tuple: &tuple, type: CTA_TUPLE_ORIG, |
1671 | l3num: u3, zone: &zone); |
1672 | else if (cda[CTA_TUPLE_REPLY]) |
1673 | err = ctnetlink_parse_tuple(cda, tuple: &tuple, type: CTA_TUPLE_REPLY, |
1674 | l3num: u3, zone: &zone); |
1675 | else |
1676 | return -EINVAL; |
1677 | |
1678 | if (err < 0) |
1679 | return err; |
1680 | |
1681 | h = nf_conntrack_find_get(net: info->net, zone: &zone, tuple: &tuple); |
1682 | if (!h) |
1683 | return -ENOENT; |
1684 | |
1685 | ct = nf_ct_tuplehash_to_ctrack(hash: h); |
1686 | |
1687 | skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); |
1688 | if (!skb2) { |
1689 | nf_ct_put(ct); |
1690 | return -ENOMEM; |
1691 | } |
1692 | |
1693 | err = ctnetlink_fill_info(skb: skb2, NETLINK_CB(skb).portid, |
1694 | seq: info->nlh->nlmsg_seq, |
1695 | NFNL_MSG_TYPE(info->nlh->nlmsg_type), ct, |
1696 | extinfo: true, flags: 0); |
1697 | nf_ct_put(ct); |
1698 | if (err <= 0) { |
1699 | kfree_skb(skb: skb2); |
1700 | return -ENOMEM; |
1701 | } |
1702 | |
1703 | return nfnetlink_unicast(skb: skb2, net: info->net, NETLINK_CB(skb).portid); |
1704 | } |
1705 | |
1706 | static int ctnetlink_done_list(struct netlink_callback *cb) |
1707 | { |
1708 | struct ctnetlink_list_dump_ctx *ctx = (void *)cb->ctx; |
1709 | |
1710 | if (ctx->last) |
1711 | nf_ct_put(ct: ctx->last); |
1712 | |
1713 | return 0; |
1714 | } |
1715 | |
1716 | #ifdef CONFIG_NF_CONNTRACK_EVENTS |
1717 | static int ctnetlink_dump_one_entry(struct sk_buff *skb, |
1718 | struct netlink_callback *cb, |
1719 | struct nf_conn *ct, |
1720 | bool dying) |
1721 | { |
1722 | struct ctnetlink_list_dump_ctx *ctx = (void *)cb->ctx; |
1723 | struct nfgenmsg *nfmsg = nlmsg_data(nlh: cb->nlh); |
1724 | u8 l3proto = nfmsg->nfgen_family; |
1725 | int res; |
1726 | |
1727 | if (l3proto && nf_ct_l3num(ct) != l3proto) |
1728 | return 0; |
1729 | |
1730 | if (ctx->last) { |
1731 | if (ct != ctx->last) |
1732 | return 0; |
1733 | |
1734 | ctx->last = NULL; |
1735 | } |
1736 | |
1737 | /* We can't dump extension info for the unconfirmed |
1738 | * list because unconfirmed conntracks can have |
1739 | * ct->ext reallocated (and thus freed). |
1740 | * |
1741 | * In the dying list case ct->ext can't be free'd |
1742 | * until after we drop pcpu->lock. |
1743 | */ |
1744 | res = ctnetlink_fill_info(skb, NETLINK_CB(cb->skb).portid, |
1745 | seq: cb->nlh->nlmsg_seq, |
1746 | NFNL_MSG_TYPE(cb->nlh->nlmsg_type), |
1747 | ct, extinfo: dying, flags: 0); |
1748 | if (res < 0) { |
1749 | if (!refcount_inc_not_zero(r: &ct->ct_general.use)) |
1750 | return 0; |
1751 | |
1752 | ctx->last = ct; |
1753 | } |
1754 | |
1755 | return res; |
1756 | } |
1757 | #endif |
1758 | |
1759 | static int |
1760 | ctnetlink_dump_unconfirmed(struct sk_buff *skb, struct netlink_callback *cb) |
1761 | { |
1762 | return 0; |
1763 | } |
1764 | |
1765 | static int |
1766 | ctnetlink_dump_dying(struct sk_buff *skb, struct netlink_callback *cb) |
1767 | { |
1768 | struct ctnetlink_list_dump_ctx *ctx = (void *)cb->ctx; |
1769 | struct nf_conn *last = ctx->last; |
1770 | #ifdef CONFIG_NF_CONNTRACK_EVENTS |
1771 | const struct net *net = sock_net(sk: skb->sk); |
1772 | struct nf_conntrack_net_ecache *ecache_net; |
1773 | struct nf_conntrack_tuple_hash *h; |
1774 | struct hlist_nulls_node *n; |
1775 | #endif |
1776 | |
1777 | if (ctx->done) |
1778 | return 0; |
1779 | |
1780 | ctx->last = NULL; |
1781 | |
1782 | #ifdef CONFIG_NF_CONNTRACK_EVENTS |
1783 | ecache_net = nf_conn_pernet_ecache(net); |
1784 | spin_lock_bh(lock: &ecache_net->dying_lock); |
1785 | |
1786 | hlist_nulls_for_each_entry(h, n, &ecache_net->dying_list, hnnode) { |
1787 | struct nf_conn *ct; |
1788 | int res; |
1789 | |
1790 | ct = nf_ct_tuplehash_to_ctrack(hash: h); |
1791 | if (last && last != ct) |
1792 | continue; |
1793 | |
1794 | res = ctnetlink_dump_one_entry(skb, cb, ct, dying: true); |
1795 | if (res < 0) { |
1796 | spin_unlock_bh(lock: &ecache_net->dying_lock); |
1797 | nf_ct_put(ct: last); |
1798 | return skb->len; |
1799 | } |
1800 | |
1801 | nf_ct_put(ct: last); |
1802 | last = NULL; |
1803 | } |
1804 | |
1805 | spin_unlock_bh(lock: &ecache_net->dying_lock); |
1806 | #endif |
1807 | ctx->done = true; |
1808 | nf_ct_put(ct: last); |
1809 | |
1810 | return skb->len; |
1811 | } |
1812 | |
1813 | static int ctnetlink_get_ct_dying(struct sk_buff *skb, |
1814 | const struct nfnl_info *info, |
1815 | const struct nlattr * const cda[]) |
1816 | { |
1817 | if (info->nlh->nlmsg_flags & NLM_F_DUMP) { |
1818 | struct netlink_dump_control c = { |
1819 | .dump = ctnetlink_dump_dying, |
1820 | .done = ctnetlink_done_list, |
1821 | }; |
1822 | return netlink_dump_start(ssk: info->sk, skb, nlh: info->nlh, control: &c); |
1823 | } |
1824 | |
1825 | return -EOPNOTSUPP; |
1826 | } |
1827 | |
1828 | static int ctnetlink_get_ct_unconfirmed(struct sk_buff *skb, |
1829 | const struct nfnl_info *info, |
1830 | const struct nlattr * const cda[]) |
1831 | { |
1832 | if (info->nlh->nlmsg_flags & NLM_F_DUMP) { |
1833 | struct netlink_dump_control c = { |
1834 | .dump = ctnetlink_dump_unconfirmed, |
1835 | .done = ctnetlink_done_list, |
1836 | }; |
1837 | return netlink_dump_start(ssk: info->sk, skb, nlh: info->nlh, control: &c); |
1838 | } |
1839 | |
1840 | return -EOPNOTSUPP; |
1841 | } |
1842 | |
1843 | #if IS_ENABLED(CONFIG_NF_NAT) |
1844 | static int |
1845 | ctnetlink_parse_nat_setup(struct nf_conn *ct, |
1846 | enum nf_nat_manip_type manip, |
1847 | const struct nlattr *attr) |
1848 | __must_hold(RCU) |
1849 | { |
1850 | const struct nf_nat_hook *nat_hook; |
1851 | int err; |
1852 | |
1853 | nat_hook = rcu_dereference(nf_nat_hook); |
1854 | if (!nat_hook) { |
1855 | #ifdef CONFIG_MODULES |
1856 | rcu_read_unlock(); |
1857 | nfnl_unlock(NFNL_SUBSYS_CTNETLINK); |
1858 | if (request_module("nf-nat" ) < 0) { |
1859 | nfnl_lock(NFNL_SUBSYS_CTNETLINK); |
1860 | rcu_read_lock(); |
1861 | return -EOPNOTSUPP; |
1862 | } |
1863 | nfnl_lock(NFNL_SUBSYS_CTNETLINK); |
1864 | rcu_read_lock(); |
1865 | nat_hook = rcu_dereference(nf_nat_hook); |
1866 | if (nat_hook) |
1867 | return -EAGAIN; |
1868 | #endif |
1869 | return -EOPNOTSUPP; |
1870 | } |
1871 | |
1872 | err = nat_hook->parse_nat_setup(ct, manip, attr); |
1873 | if (err == -EAGAIN) { |
1874 | #ifdef CONFIG_MODULES |
1875 | rcu_read_unlock(); |
1876 | nfnl_unlock(NFNL_SUBSYS_CTNETLINK); |
1877 | if (request_module("nf-nat-%u" , nf_ct_l3num(ct)) < 0) { |
1878 | nfnl_lock(NFNL_SUBSYS_CTNETLINK); |
1879 | rcu_read_lock(); |
1880 | return -EOPNOTSUPP; |
1881 | } |
1882 | nfnl_lock(NFNL_SUBSYS_CTNETLINK); |
1883 | rcu_read_lock(); |
1884 | #else |
1885 | err = -EOPNOTSUPP; |
1886 | #endif |
1887 | } |
1888 | return err; |
1889 | } |
1890 | #endif |
1891 | |
1892 | static int |
1893 | ctnetlink_change_status(struct nf_conn *ct, const struct nlattr * const cda[]) |
1894 | { |
1895 | return nf_ct_change_status_common(ct, ntohl(nla_get_be32(cda[CTA_STATUS]))); |
1896 | } |
1897 | |
1898 | static int |
1899 | ctnetlink_setup_nat(struct nf_conn *ct, const struct nlattr * const cda[]) |
1900 | { |
1901 | #if IS_ENABLED(CONFIG_NF_NAT) |
1902 | int ret; |
1903 | |
1904 | if (!cda[CTA_NAT_DST] && !cda[CTA_NAT_SRC]) |
1905 | return 0; |
1906 | |
1907 | ret = ctnetlink_parse_nat_setup(ct, manip: NF_NAT_MANIP_DST, |
1908 | attr: cda[CTA_NAT_DST]); |
1909 | if (ret < 0) |
1910 | return ret; |
1911 | |
1912 | return ctnetlink_parse_nat_setup(ct, manip: NF_NAT_MANIP_SRC, |
1913 | attr: cda[CTA_NAT_SRC]); |
1914 | #else |
1915 | if (!cda[CTA_NAT_DST] && !cda[CTA_NAT_SRC]) |
1916 | return 0; |
1917 | return -EOPNOTSUPP; |
1918 | #endif |
1919 | } |
1920 | |
1921 | static int ctnetlink_change_helper(struct nf_conn *ct, |
1922 | const struct nlattr * const cda[]) |
1923 | { |
1924 | struct nf_conntrack_helper *helper; |
1925 | struct nf_conn_help *help = nfct_help(ct); |
1926 | char *helpname = NULL; |
1927 | struct nlattr *helpinfo = NULL; |
1928 | int err; |
1929 | |
1930 | err = ctnetlink_parse_help(attr: cda[CTA_HELP], helper_name: &helpname, helpinfo: &helpinfo); |
1931 | if (err < 0) |
1932 | return err; |
1933 | |
1934 | /* don't change helper of sibling connections */ |
1935 | if (ct->master) { |
1936 | /* If we try to change the helper to the same thing twice, |
1937 | * treat the second attempt as a no-op instead of returning |
1938 | * an error. |
1939 | */ |
1940 | err = -EBUSY; |
1941 | if (help) { |
1942 | rcu_read_lock(); |
1943 | helper = rcu_dereference(help->helper); |
1944 | if (helper && !strcmp(helper->name, helpname)) |
1945 | err = 0; |
1946 | rcu_read_unlock(); |
1947 | } |
1948 | |
1949 | return err; |
1950 | } |
1951 | |
1952 | if (!strcmp(helpname, "" )) { |
1953 | if (help && help->helper) { |
1954 | /* we had a helper before ... */ |
1955 | nf_ct_remove_expectations(ct); |
1956 | RCU_INIT_POINTER(help->helper, NULL); |
1957 | } |
1958 | |
1959 | return 0; |
1960 | } |
1961 | |
1962 | rcu_read_lock(); |
1963 | helper = __nf_conntrack_helper_find(name: helpname, l3num: nf_ct_l3num(ct), |
1964 | protonum: nf_ct_protonum(ct)); |
1965 | if (helper == NULL) { |
1966 | rcu_read_unlock(); |
1967 | return -EOPNOTSUPP; |
1968 | } |
1969 | |
1970 | if (help) { |
1971 | if (rcu_access_pointer(help->helper) == helper) { |
1972 | /* update private helper data if allowed. */ |
1973 | if (helper->from_nlattr) |
1974 | helper->from_nlattr(helpinfo, ct); |
1975 | err = 0; |
1976 | } else |
1977 | err = -EBUSY; |
1978 | } else { |
1979 | /* we cannot set a helper for an existing conntrack */ |
1980 | err = -EOPNOTSUPP; |
1981 | } |
1982 | |
1983 | rcu_read_unlock(); |
1984 | return err; |
1985 | } |
1986 | |
1987 | static int ctnetlink_change_timeout(struct nf_conn *ct, |
1988 | const struct nlattr * const cda[]) |
1989 | { |
1990 | return __nf_ct_change_timeout(ct, cta_timeout: (u64)ntohl(nla_get_be32(cda[CTA_TIMEOUT])) * HZ); |
1991 | } |
1992 | |
1993 | #if defined(CONFIG_NF_CONNTRACK_MARK) |
1994 | static void ctnetlink_change_mark(struct nf_conn *ct, |
1995 | const struct nlattr * const cda[]) |
1996 | { |
1997 | u32 mark, newmark, mask = 0; |
1998 | |
1999 | if (cda[CTA_MARK_MASK]) |
2000 | mask = ~ntohl(nla_get_be32(cda[CTA_MARK_MASK])); |
2001 | |
2002 | mark = ntohl(nla_get_be32(cda[CTA_MARK])); |
2003 | newmark = (READ_ONCE(ct->mark) & mask) ^ mark; |
2004 | if (newmark != READ_ONCE(ct->mark)) |
2005 | WRITE_ONCE(ct->mark, newmark); |
2006 | } |
2007 | #endif |
2008 | |
2009 | static const struct nla_policy protoinfo_policy[CTA_PROTOINFO_MAX+1] = { |
2010 | [CTA_PROTOINFO_TCP] = { .type = NLA_NESTED }, |
2011 | [CTA_PROTOINFO_DCCP] = { .type = NLA_NESTED }, |
2012 | [CTA_PROTOINFO_SCTP] = { .type = NLA_NESTED }, |
2013 | }; |
2014 | |
2015 | static int ctnetlink_change_protoinfo(struct nf_conn *ct, |
2016 | const struct nlattr * const cda[]) |
2017 | { |
2018 | const struct nlattr *attr = cda[CTA_PROTOINFO]; |
2019 | const struct nf_conntrack_l4proto *l4proto; |
2020 | struct nlattr *tb[CTA_PROTOINFO_MAX+1]; |
2021 | int err = 0; |
2022 | |
2023 | err = nla_parse_nested_deprecated(tb, CTA_PROTOINFO_MAX, nla: attr, |
2024 | policy: protoinfo_policy, NULL); |
2025 | if (err < 0) |
2026 | return err; |
2027 | |
2028 | l4proto = nf_ct_l4proto_find(l4proto: nf_ct_protonum(ct)); |
2029 | if (l4proto->from_nlattr) |
2030 | err = l4proto->from_nlattr(tb, ct); |
2031 | |
2032 | return err; |
2033 | } |
2034 | |
2035 | static const struct nla_policy seqadj_policy[CTA_SEQADJ_MAX+1] = { |
2036 | [CTA_SEQADJ_CORRECTION_POS] = { .type = NLA_U32 }, |
2037 | [CTA_SEQADJ_OFFSET_BEFORE] = { .type = NLA_U32 }, |
2038 | [CTA_SEQADJ_OFFSET_AFTER] = { .type = NLA_U32 }, |
2039 | }; |
2040 | |
2041 | static int change_seq_adj(struct nf_ct_seqadj *seq, |
2042 | const struct nlattr * const attr) |
2043 | { |
2044 | int err; |
2045 | struct nlattr *cda[CTA_SEQADJ_MAX+1]; |
2046 | |
2047 | err = nla_parse_nested_deprecated(tb: cda, CTA_SEQADJ_MAX, nla: attr, |
2048 | policy: seqadj_policy, NULL); |
2049 | if (err < 0) |
2050 | return err; |
2051 | |
2052 | if (!cda[CTA_SEQADJ_CORRECTION_POS]) |
2053 | return -EINVAL; |
2054 | |
2055 | seq->correction_pos = |
2056 | ntohl(nla_get_be32(cda[CTA_SEQADJ_CORRECTION_POS])); |
2057 | |
2058 | if (!cda[CTA_SEQADJ_OFFSET_BEFORE]) |
2059 | return -EINVAL; |
2060 | |
2061 | seq->offset_before = |
2062 | ntohl(nla_get_be32(cda[CTA_SEQADJ_OFFSET_BEFORE])); |
2063 | |
2064 | if (!cda[CTA_SEQADJ_OFFSET_AFTER]) |
2065 | return -EINVAL; |
2066 | |
2067 | seq->offset_after = |
2068 | ntohl(nla_get_be32(cda[CTA_SEQADJ_OFFSET_AFTER])); |
2069 | |
2070 | return 0; |
2071 | } |
2072 | |
2073 | static int |
2074 | ctnetlink_change_seq_adj(struct nf_conn *ct, |
2075 | const struct nlattr * const cda[]) |
2076 | { |
2077 | struct nf_conn_seqadj *seqadj = nfct_seqadj(ct); |
2078 | int ret = 0; |
2079 | |
2080 | if (!seqadj) |
2081 | return 0; |
2082 | |
2083 | spin_lock_bh(lock: &ct->lock); |
2084 | if (cda[CTA_SEQ_ADJ_ORIG]) { |
2085 | ret = change_seq_adj(seq: &seqadj->seq[IP_CT_DIR_ORIGINAL], |
2086 | attr: cda[CTA_SEQ_ADJ_ORIG]); |
2087 | if (ret < 0) |
2088 | goto err; |
2089 | |
2090 | set_bit(nr: IPS_SEQ_ADJUST_BIT, addr: &ct->status); |
2091 | } |
2092 | |
2093 | if (cda[CTA_SEQ_ADJ_REPLY]) { |
2094 | ret = change_seq_adj(seq: &seqadj->seq[IP_CT_DIR_REPLY], |
2095 | attr: cda[CTA_SEQ_ADJ_REPLY]); |
2096 | if (ret < 0) |
2097 | goto err; |
2098 | |
2099 | set_bit(nr: IPS_SEQ_ADJUST_BIT, addr: &ct->status); |
2100 | } |
2101 | |
2102 | spin_unlock_bh(lock: &ct->lock); |
2103 | return 0; |
2104 | err: |
2105 | spin_unlock_bh(lock: &ct->lock); |
2106 | return ret; |
2107 | } |
2108 | |
2109 | static const struct nla_policy synproxy_policy[CTA_SYNPROXY_MAX + 1] = { |
2110 | [CTA_SYNPROXY_ISN] = { .type = NLA_U32 }, |
2111 | [CTA_SYNPROXY_ITS] = { .type = NLA_U32 }, |
2112 | [CTA_SYNPROXY_TSOFF] = { .type = NLA_U32 }, |
2113 | }; |
2114 | |
2115 | static int ctnetlink_change_synproxy(struct nf_conn *ct, |
2116 | const struct nlattr * const cda[]) |
2117 | { |
2118 | struct nf_conn_synproxy *synproxy = nfct_synproxy(ct); |
2119 | struct nlattr *tb[CTA_SYNPROXY_MAX + 1]; |
2120 | int err; |
2121 | |
2122 | if (!synproxy) |
2123 | return 0; |
2124 | |
2125 | err = nla_parse_nested_deprecated(tb, CTA_SYNPROXY_MAX, |
2126 | nla: cda[CTA_SYNPROXY], policy: synproxy_policy, |
2127 | NULL); |
2128 | if (err < 0) |
2129 | return err; |
2130 | |
2131 | if (!tb[CTA_SYNPROXY_ISN] || |
2132 | !tb[CTA_SYNPROXY_ITS] || |
2133 | !tb[CTA_SYNPROXY_TSOFF]) |
2134 | return -EINVAL; |
2135 | |
2136 | synproxy->isn = ntohl(nla_get_be32(tb[CTA_SYNPROXY_ISN])); |
2137 | synproxy->its = ntohl(nla_get_be32(tb[CTA_SYNPROXY_ITS])); |
2138 | synproxy->tsoff = ntohl(nla_get_be32(tb[CTA_SYNPROXY_TSOFF])); |
2139 | |
2140 | return 0; |
2141 | } |
2142 | |
2143 | static int |
2144 | ctnetlink_attach_labels(struct nf_conn *ct, const struct nlattr * const cda[]) |
2145 | { |
2146 | #ifdef CONFIG_NF_CONNTRACK_LABELS |
2147 | size_t len = nla_len(nla: cda[CTA_LABELS]); |
2148 | const void *mask = cda[CTA_LABELS_MASK]; |
2149 | |
2150 | if (len & (sizeof(u32)-1)) /* must be multiple of u32 */ |
2151 | return -EINVAL; |
2152 | |
2153 | if (mask) { |
2154 | if (nla_len(nla: cda[CTA_LABELS_MASK]) == 0 || |
2155 | nla_len(nla: cda[CTA_LABELS_MASK]) != len) |
2156 | return -EINVAL; |
2157 | mask = nla_data(nla: cda[CTA_LABELS_MASK]); |
2158 | } |
2159 | |
2160 | len /= sizeof(u32); |
2161 | |
2162 | return nf_connlabels_replace(ct, data: nla_data(nla: cda[CTA_LABELS]), mask, words: len); |
2163 | #else |
2164 | return -EOPNOTSUPP; |
2165 | #endif |
2166 | } |
2167 | |
2168 | static int |
2169 | ctnetlink_change_conntrack(struct nf_conn *ct, |
2170 | const struct nlattr * const cda[]) |
2171 | { |
2172 | int err; |
2173 | |
2174 | /* only allow NAT changes and master assignation for new conntracks */ |
2175 | if (cda[CTA_NAT_SRC] || cda[CTA_NAT_DST] || cda[CTA_TUPLE_MASTER]) |
2176 | return -EOPNOTSUPP; |
2177 | |
2178 | if (cda[CTA_HELP]) { |
2179 | err = ctnetlink_change_helper(ct, cda); |
2180 | if (err < 0) |
2181 | return err; |
2182 | } |
2183 | |
2184 | if (cda[CTA_TIMEOUT]) { |
2185 | err = ctnetlink_change_timeout(ct, cda); |
2186 | if (err < 0) |
2187 | return err; |
2188 | } |
2189 | |
2190 | if (cda[CTA_STATUS]) { |
2191 | err = ctnetlink_change_status(ct, cda); |
2192 | if (err < 0) |
2193 | return err; |
2194 | } |
2195 | |
2196 | if (cda[CTA_PROTOINFO]) { |
2197 | err = ctnetlink_change_protoinfo(ct, cda); |
2198 | if (err < 0) |
2199 | return err; |
2200 | } |
2201 | |
2202 | #if defined(CONFIG_NF_CONNTRACK_MARK) |
2203 | if (cda[CTA_MARK]) |
2204 | ctnetlink_change_mark(ct, cda); |
2205 | #endif |
2206 | |
2207 | if (cda[CTA_SEQ_ADJ_ORIG] || cda[CTA_SEQ_ADJ_REPLY]) { |
2208 | err = ctnetlink_change_seq_adj(ct, cda); |
2209 | if (err < 0) |
2210 | return err; |
2211 | } |
2212 | |
2213 | if (cda[CTA_SYNPROXY]) { |
2214 | err = ctnetlink_change_synproxy(ct, cda); |
2215 | if (err < 0) |
2216 | return err; |
2217 | } |
2218 | |
2219 | if (cda[CTA_LABELS]) { |
2220 | err = ctnetlink_attach_labels(ct, cda); |
2221 | if (err < 0) |
2222 | return err; |
2223 | } |
2224 | |
2225 | return 0; |
2226 | } |
2227 | |
2228 | static struct nf_conn * |
2229 | ctnetlink_create_conntrack(struct net *net, |
2230 | const struct nf_conntrack_zone *zone, |
2231 | const struct nlattr * const cda[], |
2232 | struct nf_conntrack_tuple *otuple, |
2233 | struct nf_conntrack_tuple *rtuple, |
2234 | u8 u3) |
2235 | { |
2236 | struct nf_conn *ct; |
2237 | int err = -EINVAL; |
2238 | struct nf_conntrack_helper *helper; |
2239 | struct nf_conn_tstamp *tstamp; |
2240 | u64 timeout; |
2241 | |
2242 | ct = nf_conntrack_alloc(net, zone, orig: otuple, repl: rtuple, GFP_ATOMIC); |
2243 | if (IS_ERR(ptr: ct)) |
2244 | return ERR_PTR(error: -ENOMEM); |
2245 | |
2246 | if (!cda[CTA_TIMEOUT]) |
2247 | goto err1; |
2248 | |
2249 | rcu_read_lock(); |
2250 | if (cda[CTA_HELP]) { |
2251 | char *helpname = NULL; |
2252 | struct nlattr *helpinfo = NULL; |
2253 | |
2254 | err = ctnetlink_parse_help(attr: cda[CTA_HELP], helper_name: &helpname, helpinfo: &helpinfo); |
2255 | if (err < 0) |
2256 | goto err2; |
2257 | |
2258 | helper = __nf_conntrack_helper_find(name: helpname, l3num: nf_ct_l3num(ct), |
2259 | protonum: nf_ct_protonum(ct)); |
2260 | if (helper == NULL) { |
2261 | rcu_read_unlock(); |
2262 | #ifdef CONFIG_MODULES |
2263 | if (request_module("nfct-helper-%s" , helpname) < 0) { |
2264 | err = -EOPNOTSUPP; |
2265 | goto err1; |
2266 | } |
2267 | |
2268 | rcu_read_lock(); |
2269 | helper = __nf_conntrack_helper_find(name: helpname, |
2270 | l3num: nf_ct_l3num(ct), |
2271 | protonum: nf_ct_protonum(ct)); |
2272 | if (helper) { |
2273 | err = -EAGAIN; |
2274 | goto err2; |
2275 | } |
2276 | rcu_read_unlock(); |
2277 | #endif |
2278 | err = -EOPNOTSUPP; |
2279 | goto err1; |
2280 | } else { |
2281 | struct nf_conn_help *help; |
2282 | |
2283 | help = nf_ct_helper_ext_add(ct, GFP_ATOMIC); |
2284 | if (help == NULL) { |
2285 | err = -ENOMEM; |
2286 | goto err2; |
2287 | } |
2288 | /* set private helper data if allowed. */ |
2289 | if (helper->from_nlattr) |
2290 | helper->from_nlattr(helpinfo, ct); |
2291 | |
2292 | /* disable helper auto-assignment for this entry */ |
2293 | ct->status |= IPS_HELPER; |
2294 | RCU_INIT_POINTER(help->helper, helper); |
2295 | } |
2296 | } |
2297 | |
2298 | err = ctnetlink_setup_nat(ct, cda); |
2299 | if (err < 0) |
2300 | goto err2; |
2301 | |
2302 | nf_ct_acct_ext_add(ct, GFP_ATOMIC); |
2303 | nf_ct_tstamp_ext_add(ct, GFP_ATOMIC); |
2304 | nf_ct_ecache_ext_add(ct, ctmask: 0, expmask: 0, GFP_ATOMIC); |
2305 | nf_ct_labels_ext_add(ct); |
2306 | nfct_seqadj_ext_add(ct); |
2307 | nfct_synproxy_ext_add(ct); |
2308 | |
2309 | /* we must add conntrack extensions before confirmation. */ |
2310 | ct->status |= IPS_CONFIRMED; |
2311 | |
2312 | timeout = (u64)ntohl(nla_get_be32(cda[CTA_TIMEOUT])) * HZ; |
2313 | __nf_ct_set_timeout(ct, timeout); |
2314 | |
2315 | if (cda[CTA_STATUS]) { |
2316 | err = ctnetlink_change_status(ct, cda); |
2317 | if (err < 0) |
2318 | goto err2; |
2319 | } |
2320 | |
2321 | if (cda[CTA_SEQ_ADJ_ORIG] || cda[CTA_SEQ_ADJ_REPLY]) { |
2322 | err = ctnetlink_change_seq_adj(ct, cda); |
2323 | if (err < 0) |
2324 | goto err2; |
2325 | } |
2326 | |
2327 | memset(&ct->proto, 0, sizeof(ct->proto)); |
2328 | if (cda[CTA_PROTOINFO]) { |
2329 | err = ctnetlink_change_protoinfo(ct, cda); |
2330 | if (err < 0) |
2331 | goto err2; |
2332 | } |
2333 | |
2334 | if (cda[CTA_SYNPROXY]) { |
2335 | err = ctnetlink_change_synproxy(ct, cda); |
2336 | if (err < 0) |
2337 | goto err2; |
2338 | } |
2339 | |
2340 | #if defined(CONFIG_NF_CONNTRACK_MARK) |
2341 | if (cda[CTA_MARK]) |
2342 | ctnetlink_change_mark(ct, cda); |
2343 | #endif |
2344 | |
2345 | /* setup master conntrack: this is a confirmed expectation */ |
2346 | if (cda[CTA_TUPLE_MASTER]) { |
2347 | struct nf_conntrack_tuple master; |
2348 | struct nf_conntrack_tuple_hash *master_h; |
2349 | struct nf_conn *master_ct; |
2350 | |
2351 | err = ctnetlink_parse_tuple(cda, tuple: &master, type: CTA_TUPLE_MASTER, |
2352 | l3num: u3, NULL); |
2353 | if (err < 0) |
2354 | goto err2; |
2355 | |
2356 | master_h = nf_conntrack_find_get(net, zone, tuple: &master); |
2357 | if (master_h == NULL) { |
2358 | err = -ENOENT; |
2359 | goto err2; |
2360 | } |
2361 | master_ct = nf_ct_tuplehash_to_ctrack(hash: master_h); |
2362 | __set_bit(IPS_EXPECTED_BIT, &ct->status); |
2363 | ct->master = master_ct; |
2364 | } |
2365 | tstamp = nf_conn_tstamp_find(ct); |
2366 | if (tstamp) |
2367 | tstamp->start = ktime_get_real_ns(); |
2368 | |
2369 | err = nf_conntrack_hash_check_insert(ct); |
2370 | if (err < 0) |
2371 | goto err3; |
2372 | |
2373 | rcu_read_unlock(); |
2374 | |
2375 | return ct; |
2376 | |
2377 | err3: |
2378 | if (ct->master) |
2379 | nf_ct_put(ct: ct->master); |
2380 | err2: |
2381 | rcu_read_unlock(); |
2382 | err1: |
2383 | nf_conntrack_free(ct); |
2384 | return ERR_PTR(error: err); |
2385 | } |
2386 | |
2387 | static int ctnetlink_new_conntrack(struct sk_buff *skb, |
2388 | const struct nfnl_info *info, |
2389 | const struct nlattr * const cda[]) |
2390 | { |
2391 | struct nf_conntrack_tuple otuple, rtuple; |
2392 | struct nf_conntrack_tuple_hash *h = NULL; |
2393 | u_int8_t u3 = info->nfmsg->nfgen_family; |
2394 | struct nf_conntrack_zone zone; |
2395 | struct nf_conn *ct; |
2396 | int err; |
2397 | |
2398 | err = ctnetlink_parse_zone(attr: cda[CTA_ZONE], zone: &zone); |
2399 | if (err < 0) |
2400 | return err; |
2401 | |
2402 | if (cda[CTA_TUPLE_ORIG]) { |
2403 | err = ctnetlink_parse_tuple(cda, tuple: &otuple, type: CTA_TUPLE_ORIG, |
2404 | l3num: u3, zone: &zone); |
2405 | if (err < 0) |
2406 | return err; |
2407 | } |
2408 | |
2409 | if (cda[CTA_TUPLE_REPLY]) { |
2410 | err = ctnetlink_parse_tuple(cda, tuple: &rtuple, type: CTA_TUPLE_REPLY, |
2411 | l3num: u3, zone: &zone); |
2412 | if (err < 0) |
2413 | return err; |
2414 | } |
2415 | |
2416 | if (cda[CTA_TUPLE_ORIG]) |
2417 | h = nf_conntrack_find_get(net: info->net, zone: &zone, tuple: &otuple); |
2418 | else if (cda[CTA_TUPLE_REPLY]) |
2419 | h = nf_conntrack_find_get(net: info->net, zone: &zone, tuple: &rtuple); |
2420 | |
2421 | if (h == NULL) { |
2422 | err = -ENOENT; |
2423 | if (info->nlh->nlmsg_flags & NLM_F_CREATE) { |
2424 | enum ip_conntrack_events events; |
2425 | |
2426 | if (!cda[CTA_TUPLE_ORIG] || !cda[CTA_TUPLE_REPLY]) |
2427 | return -EINVAL; |
2428 | if (otuple.dst.protonum != rtuple.dst.protonum) |
2429 | return -EINVAL; |
2430 | |
2431 | ct = ctnetlink_create_conntrack(net: info->net, zone: &zone, cda, |
2432 | otuple: &otuple, rtuple: &rtuple, u3); |
2433 | if (IS_ERR(ptr: ct)) |
2434 | return PTR_ERR(ptr: ct); |
2435 | |
2436 | err = 0; |
2437 | if (test_bit(IPS_EXPECTED_BIT, &ct->status)) |
2438 | events = 1 << IPCT_RELATED; |
2439 | else |
2440 | events = 1 << IPCT_NEW; |
2441 | |
2442 | if (cda[CTA_LABELS] && |
2443 | ctnetlink_attach_labels(ct, cda) == 0) |
2444 | events |= (1 << IPCT_LABEL); |
2445 | |
2446 | nf_conntrack_eventmask_report(eventmask: (1 << IPCT_REPLY) | |
2447 | (1 << IPCT_ASSURED) | |
2448 | (1 << IPCT_HELPER) | |
2449 | (1 << IPCT_PROTOINFO) | |
2450 | (1 << IPCT_SEQADJ) | |
2451 | (1 << IPCT_MARK) | |
2452 | (1 << IPCT_SYNPROXY) | |
2453 | events, |
2454 | ct, NETLINK_CB(skb).portid, |
2455 | report: nlmsg_report(nlh: info->nlh)); |
2456 | nf_ct_put(ct); |
2457 | } |
2458 | |
2459 | return err; |
2460 | } |
2461 | /* implicit 'else' */ |
2462 | |
2463 | err = -EEXIST; |
2464 | ct = nf_ct_tuplehash_to_ctrack(hash: h); |
2465 | if (!(info->nlh->nlmsg_flags & NLM_F_EXCL)) { |
2466 | err = ctnetlink_change_conntrack(ct, cda); |
2467 | if (err == 0) { |
2468 | nf_conntrack_eventmask_report(eventmask: (1 << IPCT_REPLY) | |
2469 | (1 << IPCT_ASSURED) | |
2470 | (1 << IPCT_HELPER) | |
2471 | (1 << IPCT_LABEL) | |
2472 | (1 << IPCT_PROTOINFO) | |
2473 | (1 << IPCT_SEQADJ) | |
2474 | (1 << IPCT_MARK) | |
2475 | (1 << IPCT_SYNPROXY), |
2476 | ct, NETLINK_CB(skb).portid, |
2477 | report: nlmsg_report(nlh: info->nlh)); |
2478 | } |
2479 | } |
2480 | |
2481 | nf_ct_put(ct); |
2482 | return err; |
2483 | } |
2484 | |
2485 | static int |
2486 | ctnetlink_ct_stat_cpu_fill_info(struct sk_buff *skb, u32 portid, u32 seq, |
2487 | __u16 cpu, const struct ip_conntrack_stat *st) |
2488 | { |
2489 | struct nlmsghdr *nlh; |
2490 | unsigned int flags = portid ? NLM_F_MULTI : 0, event; |
2491 | |
2492 | event = nfnl_msg_type(NFNL_SUBSYS_CTNETLINK, |
2493 | msg_type: IPCTNL_MSG_CT_GET_STATS_CPU); |
2494 | nlh = nfnl_msg_put(skb, portid, seq, type: event, flags, AF_UNSPEC, |
2495 | NFNETLINK_V0, htons(cpu)); |
2496 | if (!nlh) |
2497 | goto nlmsg_failure; |
2498 | |
2499 | if (nla_put_be32(skb, attrtype: CTA_STATS_FOUND, htonl(st->found)) || |
2500 | nla_put_be32(skb, attrtype: CTA_STATS_INVALID, htonl(st->invalid)) || |
2501 | nla_put_be32(skb, attrtype: CTA_STATS_INSERT, htonl(st->insert)) || |
2502 | nla_put_be32(skb, attrtype: CTA_STATS_INSERT_FAILED, |
2503 | htonl(st->insert_failed)) || |
2504 | nla_put_be32(skb, attrtype: CTA_STATS_DROP, htonl(st->drop)) || |
2505 | nla_put_be32(skb, attrtype: CTA_STATS_EARLY_DROP, htonl(st->early_drop)) || |
2506 | nla_put_be32(skb, attrtype: CTA_STATS_ERROR, htonl(st->error)) || |
2507 | nla_put_be32(skb, attrtype: CTA_STATS_SEARCH_RESTART, |
2508 | htonl(st->search_restart)) || |
2509 | nla_put_be32(skb, attrtype: CTA_STATS_CLASH_RESOLVE, |
2510 | htonl(st->clash_resolve)) || |
2511 | nla_put_be32(skb, attrtype: CTA_STATS_CHAIN_TOOLONG, |
2512 | htonl(st->chaintoolong))) |
2513 | goto nla_put_failure; |
2514 | |
2515 | nlmsg_end(skb, nlh); |
2516 | return skb->len; |
2517 | |
2518 | nla_put_failure: |
2519 | nlmsg_failure: |
2520 | nlmsg_cancel(skb, nlh); |
2521 | return -1; |
2522 | } |
2523 | |
2524 | static int |
2525 | ctnetlink_ct_stat_cpu_dump(struct sk_buff *skb, struct netlink_callback *cb) |
2526 | { |
2527 | int cpu; |
2528 | struct net *net = sock_net(sk: skb->sk); |
2529 | |
2530 | if (cb->args[0] == nr_cpu_ids) |
2531 | return 0; |
2532 | |
2533 | for (cpu = cb->args[0]; cpu < nr_cpu_ids; cpu++) { |
2534 | const struct ip_conntrack_stat *st; |
2535 | |
2536 | if (!cpu_possible(cpu)) |
2537 | continue; |
2538 | |
2539 | st = per_cpu_ptr(net->ct.stat, cpu); |
2540 | if (ctnetlink_ct_stat_cpu_fill_info(skb, |
2541 | NETLINK_CB(cb->skb).portid, |
2542 | seq: cb->nlh->nlmsg_seq, |
2543 | cpu, st) < 0) |
2544 | break; |
2545 | } |
2546 | cb->args[0] = cpu; |
2547 | |
2548 | return skb->len; |
2549 | } |
2550 | |
2551 | static int ctnetlink_stat_ct_cpu(struct sk_buff *skb, |
2552 | const struct nfnl_info *info, |
2553 | const struct nlattr * const cda[]) |
2554 | { |
2555 | if (info->nlh->nlmsg_flags & NLM_F_DUMP) { |
2556 | struct netlink_dump_control c = { |
2557 | .dump = ctnetlink_ct_stat_cpu_dump, |
2558 | }; |
2559 | return netlink_dump_start(ssk: info->sk, skb, nlh: info->nlh, control: &c); |
2560 | } |
2561 | |
2562 | return 0; |
2563 | } |
2564 | |
2565 | static int |
2566 | ctnetlink_stat_ct_fill_info(struct sk_buff *skb, u32 portid, u32 seq, u32 type, |
2567 | struct net *net) |
2568 | { |
2569 | unsigned int flags = portid ? NLM_F_MULTI : 0, event; |
2570 | unsigned int nr_conntracks; |
2571 | struct nlmsghdr *nlh; |
2572 | |
2573 | event = nfnl_msg_type(NFNL_SUBSYS_CTNETLINK, msg_type: IPCTNL_MSG_CT_GET_STATS); |
2574 | nlh = nfnl_msg_put(skb, portid, seq, type: event, flags, AF_UNSPEC, |
2575 | NFNETLINK_V0, res_id: 0); |
2576 | if (!nlh) |
2577 | goto nlmsg_failure; |
2578 | |
2579 | nr_conntracks = nf_conntrack_count(net); |
2580 | if (nla_put_be32(skb, attrtype: CTA_STATS_GLOBAL_ENTRIES, htonl(nr_conntracks))) |
2581 | goto nla_put_failure; |
2582 | |
2583 | if (nla_put_be32(skb, attrtype: CTA_STATS_GLOBAL_MAX_ENTRIES, htonl(nf_conntrack_max))) |
2584 | goto nla_put_failure; |
2585 | |
2586 | nlmsg_end(skb, nlh); |
2587 | return skb->len; |
2588 | |
2589 | nla_put_failure: |
2590 | nlmsg_failure: |
2591 | nlmsg_cancel(skb, nlh); |
2592 | return -1; |
2593 | } |
2594 | |
2595 | static int ctnetlink_stat_ct(struct sk_buff *skb, const struct nfnl_info *info, |
2596 | const struct nlattr * const cda[]) |
2597 | { |
2598 | struct sk_buff *skb2; |
2599 | int err; |
2600 | |
2601 | skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); |
2602 | if (skb2 == NULL) |
2603 | return -ENOMEM; |
2604 | |
2605 | err = ctnetlink_stat_ct_fill_info(skb: skb2, NETLINK_CB(skb).portid, |
2606 | seq: info->nlh->nlmsg_seq, |
2607 | NFNL_MSG_TYPE(info->nlh->nlmsg_type), |
2608 | net: sock_net(sk: skb->sk)); |
2609 | if (err <= 0) { |
2610 | kfree_skb(skb: skb2); |
2611 | return -ENOMEM; |
2612 | } |
2613 | |
2614 | return nfnetlink_unicast(skb: skb2, net: info->net, NETLINK_CB(skb).portid); |
2615 | } |
2616 | |
2617 | static const struct nla_policy exp_nla_policy[CTA_EXPECT_MAX+1] = { |
2618 | [CTA_EXPECT_MASTER] = { .type = NLA_NESTED }, |
2619 | [CTA_EXPECT_TUPLE] = { .type = NLA_NESTED }, |
2620 | [CTA_EXPECT_MASK] = { .type = NLA_NESTED }, |
2621 | [CTA_EXPECT_TIMEOUT] = { .type = NLA_U32 }, |
2622 | [CTA_EXPECT_ID] = { .type = NLA_U32 }, |
2623 | [CTA_EXPECT_HELP_NAME] = { .type = NLA_NUL_STRING, |
2624 | .len = NF_CT_HELPER_NAME_LEN - 1 }, |
2625 | [CTA_EXPECT_ZONE] = { .type = NLA_U16 }, |
2626 | [CTA_EXPECT_FLAGS] = { .type = NLA_U32 }, |
2627 | [CTA_EXPECT_CLASS] = { .type = NLA_U32 }, |
2628 | [CTA_EXPECT_NAT] = { .type = NLA_NESTED }, |
2629 | [CTA_EXPECT_FN] = { .type = NLA_NUL_STRING }, |
2630 | }; |
2631 | |
2632 | static struct nf_conntrack_expect * |
2633 | ctnetlink_alloc_expect(const struct nlattr *const cda[], struct nf_conn *ct, |
2634 | struct nf_conntrack_helper *helper, |
2635 | struct nf_conntrack_tuple *tuple, |
2636 | struct nf_conntrack_tuple *mask); |
2637 | |
2638 | #ifdef CONFIG_NETFILTER_NETLINK_GLUE_CT |
2639 | static size_t |
2640 | ctnetlink_glue_build_size(const struct nf_conn *ct) |
2641 | { |
2642 | return 3 * nla_total_size(payload: 0) /* CTA_TUPLE_ORIG|REPL|MASTER */ |
2643 | + 3 * nla_total_size(payload: 0) /* CTA_TUPLE_IP */ |
2644 | + 3 * nla_total_size(payload: 0) /* CTA_TUPLE_PROTO */ |
2645 | + 3 * nla_total_size(payload: sizeof(u_int8_t)) /* CTA_PROTO_NUM */ |
2646 | + nla_total_size(payload: sizeof(u_int32_t)) /* CTA_ID */ |
2647 | + nla_total_size(payload: sizeof(u_int32_t)) /* CTA_STATUS */ |
2648 | + nla_total_size(payload: sizeof(u_int32_t)) /* CTA_TIMEOUT */ |
2649 | + nla_total_size(payload: 0) /* CTA_PROTOINFO */ |
2650 | + nla_total_size(payload: 0) /* CTA_HELP */ |
2651 | + nla_total_size(NF_CT_HELPER_NAME_LEN) /* CTA_HELP_NAME */ |
2652 | + ctnetlink_secctx_size(ct) |
2653 | + ctnetlink_acct_size(ct) |
2654 | + ctnetlink_timestamp_size(ct) |
2655 | #if IS_ENABLED(CONFIG_NF_NAT) |
2656 | + 2 * nla_total_size(payload: 0) /* CTA_NAT_SEQ_ADJ_ORIG|REPL */ |
2657 | + 6 * nla_total_size(payload: sizeof(u_int32_t)) /* CTA_NAT_SEQ_OFFSET */ |
2658 | #endif |
2659 | #ifdef CONFIG_NF_CONNTRACK_MARK |
2660 | + nla_total_size(payload: sizeof(u_int32_t)) /* CTA_MARK */ |
2661 | #endif |
2662 | #ifdef CONFIG_NF_CONNTRACK_ZONES |
2663 | + nla_total_size(payload: sizeof(u_int16_t)) /* CTA_ZONE|CTA_TUPLE_ZONE */ |
2664 | #endif |
2665 | + ctnetlink_proto_size(ct) |
2666 | ; |
2667 | } |
2668 | |
2669 | static int __ctnetlink_glue_build(struct sk_buff *skb, struct nf_conn *ct) |
2670 | { |
2671 | const struct nf_conntrack_zone *zone; |
2672 | struct nlattr *nest_parms; |
2673 | |
2674 | zone = nf_ct_zone(ct); |
2675 | |
2676 | nest_parms = nla_nest_start(skb, attrtype: CTA_TUPLE_ORIG); |
2677 | if (!nest_parms) |
2678 | goto nla_put_failure; |
2679 | if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_ORIGINAL)) < 0) |
2680 | goto nla_put_failure; |
2681 | if (ctnetlink_dump_zone_id(skb, attrtype: CTA_TUPLE_ZONE, zone, |
2682 | NF_CT_ZONE_DIR_ORIG) < 0) |
2683 | goto nla_put_failure; |
2684 | nla_nest_end(skb, start: nest_parms); |
2685 | |
2686 | nest_parms = nla_nest_start(skb, attrtype: CTA_TUPLE_REPLY); |
2687 | if (!nest_parms) |
2688 | goto nla_put_failure; |
2689 | if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_REPLY)) < 0) |
2690 | goto nla_put_failure; |
2691 | if (ctnetlink_dump_zone_id(skb, attrtype: CTA_TUPLE_ZONE, zone, |
2692 | NF_CT_ZONE_DIR_REPL) < 0) |
2693 | goto nla_put_failure; |
2694 | nla_nest_end(skb, start: nest_parms); |
2695 | |
2696 | if (ctnetlink_dump_zone_id(skb, attrtype: CTA_ZONE, zone, |
2697 | NF_CT_DEFAULT_ZONE_DIR) < 0) |
2698 | goto nla_put_failure; |
2699 | |
2700 | if (ctnetlink_dump_id(skb, ct) < 0) |
2701 | goto nla_put_failure; |
2702 | |
2703 | if (ctnetlink_dump_status(skb, ct) < 0) |
2704 | goto nla_put_failure; |
2705 | |
2706 | if (ctnetlink_dump_timeout(skb, ct, skip_zero: false) < 0) |
2707 | goto nla_put_failure; |
2708 | |
2709 | if (ctnetlink_dump_protoinfo(skb, ct, destroy: false) < 0) |
2710 | goto nla_put_failure; |
2711 | |
2712 | if (ctnetlink_dump_acct(skb, ct, type: IPCTNL_MSG_CT_GET) < 0 || |
2713 | ctnetlink_dump_timestamp(skb, ct) < 0) |
2714 | goto nla_put_failure; |
2715 | |
2716 | if (ctnetlink_dump_helpinfo(skb, ct) < 0) |
2717 | goto nla_put_failure; |
2718 | |
2719 | #ifdef CONFIG_NF_CONNTRACK_SECMARK |
2720 | if (ct->secmark && ctnetlink_dump_secctx(skb, ct) < 0) |
2721 | goto nla_put_failure; |
2722 | #endif |
2723 | if (ct->master && ctnetlink_dump_master(skb, ct) < 0) |
2724 | goto nla_put_failure; |
2725 | |
2726 | if ((ct->status & IPS_SEQ_ADJUST) && |
2727 | ctnetlink_dump_ct_seq_adj(skb, ct) < 0) |
2728 | goto nla_put_failure; |
2729 | |
2730 | if (ctnetlink_dump_ct_synproxy(skb, ct) < 0) |
2731 | goto nla_put_failure; |
2732 | |
2733 | #ifdef CONFIG_NF_CONNTRACK_MARK |
2734 | if (ctnetlink_dump_mark(skb, ct, dump: true) < 0) |
2735 | goto nla_put_failure; |
2736 | #endif |
2737 | if (ctnetlink_dump_labels(skb, ct) < 0) |
2738 | goto nla_put_failure; |
2739 | return 0; |
2740 | |
2741 | nla_put_failure: |
2742 | return -ENOSPC; |
2743 | } |
2744 | |
2745 | static int |
2746 | ctnetlink_glue_build(struct sk_buff *skb, struct nf_conn *ct, |
2747 | enum ip_conntrack_info ctinfo, |
2748 | u_int16_t ct_attr, u_int16_t ct_info_attr) |
2749 | { |
2750 | struct nlattr *nest_parms; |
2751 | |
2752 | nest_parms = nla_nest_start(skb, attrtype: ct_attr); |
2753 | if (!nest_parms) |
2754 | goto nla_put_failure; |
2755 | |
2756 | if (__ctnetlink_glue_build(skb, ct) < 0) |
2757 | goto nla_put_failure; |
2758 | |
2759 | nla_nest_end(skb, start: nest_parms); |
2760 | |
2761 | if (nla_put_be32(skb, attrtype: ct_info_attr, htonl(ctinfo))) |
2762 | goto nla_put_failure; |
2763 | |
2764 | return 0; |
2765 | |
2766 | nla_put_failure: |
2767 | return -ENOSPC; |
2768 | } |
2769 | |
2770 | static int |
2771 | ctnetlink_update_status(struct nf_conn *ct, const struct nlattr * const cda[]) |
2772 | { |
2773 | unsigned int status = ntohl(nla_get_be32(cda[CTA_STATUS])); |
2774 | unsigned long d = ct->status ^ status; |
2775 | |
2776 | if (d & IPS_SEEN_REPLY && !(status & IPS_SEEN_REPLY)) |
2777 | /* SEEN_REPLY bit can only be set */ |
2778 | return -EBUSY; |
2779 | |
2780 | if (d & IPS_ASSURED && !(status & IPS_ASSURED)) |
2781 | /* ASSURED bit can only be set */ |
2782 | return -EBUSY; |
2783 | |
2784 | /* This check is less strict than ctnetlink_change_status() |
2785 | * because callers often flip IPS_EXPECTED bits when sending |
2786 | * an NFQA_CT attribute to the kernel. So ignore the |
2787 | * unchangeable bits but do not error out. Also user programs |
2788 | * are allowed to clear the bits that they are allowed to change. |
2789 | */ |
2790 | __nf_ct_change_status(ct, on: status, off: ~status); |
2791 | return 0; |
2792 | } |
2793 | |
2794 | static int |
2795 | ctnetlink_glue_parse_ct(const struct nlattr *cda[], struct nf_conn *ct) |
2796 | { |
2797 | int err; |
2798 | |
2799 | if (cda[CTA_TIMEOUT]) { |
2800 | err = ctnetlink_change_timeout(ct, cda); |
2801 | if (err < 0) |
2802 | return err; |
2803 | } |
2804 | if (cda[CTA_STATUS]) { |
2805 | err = ctnetlink_update_status(ct, cda); |
2806 | if (err < 0) |
2807 | return err; |
2808 | } |
2809 | if (cda[CTA_HELP]) { |
2810 | err = ctnetlink_change_helper(ct, cda); |
2811 | if (err < 0) |
2812 | return err; |
2813 | } |
2814 | if (cda[CTA_LABELS]) { |
2815 | err = ctnetlink_attach_labels(ct, cda); |
2816 | if (err < 0) |
2817 | return err; |
2818 | } |
2819 | #if defined(CONFIG_NF_CONNTRACK_MARK) |
2820 | if (cda[CTA_MARK]) { |
2821 | ctnetlink_change_mark(ct, cda); |
2822 | } |
2823 | #endif |
2824 | return 0; |
2825 | } |
2826 | |
2827 | static int |
2828 | ctnetlink_glue_parse(const struct nlattr *attr, struct nf_conn *ct) |
2829 | { |
2830 | struct nlattr *cda[CTA_MAX+1]; |
2831 | int ret; |
2832 | |
2833 | ret = nla_parse_nested_deprecated(tb: cda, CTA_MAX, nla: attr, policy: ct_nla_policy, |
2834 | NULL); |
2835 | if (ret < 0) |
2836 | return ret; |
2837 | |
2838 | return ctnetlink_glue_parse_ct(cda: (const struct nlattr **)cda, ct); |
2839 | } |
2840 | |
2841 | static int ctnetlink_glue_exp_parse(const struct nlattr * const *cda, |
2842 | const struct nf_conn *ct, |
2843 | struct nf_conntrack_tuple *tuple, |
2844 | struct nf_conntrack_tuple *mask) |
2845 | { |
2846 | int err; |
2847 | |
2848 | err = ctnetlink_parse_tuple(cda, tuple, type: CTA_EXPECT_TUPLE, |
2849 | l3num: nf_ct_l3num(ct), NULL); |
2850 | if (err < 0) |
2851 | return err; |
2852 | |
2853 | return ctnetlink_parse_tuple(cda, tuple: mask, type: CTA_EXPECT_MASK, |
2854 | l3num: nf_ct_l3num(ct), NULL); |
2855 | } |
2856 | |
2857 | static int |
2858 | ctnetlink_glue_attach_expect(const struct nlattr *attr, struct nf_conn *ct, |
2859 | u32 portid, u32 report) |
2860 | { |
2861 | struct nlattr *cda[CTA_EXPECT_MAX+1]; |
2862 | struct nf_conntrack_tuple tuple, mask; |
2863 | struct nf_conntrack_helper *helper = NULL; |
2864 | struct nf_conntrack_expect *exp; |
2865 | int err; |
2866 | |
2867 | err = nla_parse_nested_deprecated(tb: cda, CTA_EXPECT_MAX, nla: attr, |
2868 | policy: exp_nla_policy, NULL); |
2869 | if (err < 0) |
2870 | return err; |
2871 | |
2872 | err = ctnetlink_glue_exp_parse(cda: (const struct nlattr * const *)cda, |
2873 | ct, tuple: &tuple, mask: &mask); |
2874 | if (err < 0) |
2875 | return err; |
2876 | |
2877 | if (cda[CTA_EXPECT_HELP_NAME]) { |
2878 | const char *helpname = nla_data(nla: cda[CTA_EXPECT_HELP_NAME]); |
2879 | |
2880 | helper = __nf_conntrack_helper_find(name: helpname, l3num: nf_ct_l3num(ct), |
2881 | protonum: nf_ct_protonum(ct)); |
2882 | if (helper == NULL) |
2883 | return -EOPNOTSUPP; |
2884 | } |
2885 | |
2886 | exp = ctnetlink_alloc_expect(cda: (const struct nlattr * const *)cda, ct, |
2887 | helper, tuple: &tuple, mask: &mask); |
2888 | if (IS_ERR(ptr: exp)) |
2889 | return PTR_ERR(ptr: exp); |
2890 | |
2891 | err = nf_ct_expect_related_report(expect: exp, portid, report, flags: 0); |
2892 | nf_ct_expect_put(exp); |
2893 | return err; |
2894 | } |
2895 | |
2896 | static void ctnetlink_glue_seqadj(struct sk_buff *skb, struct nf_conn *ct, |
2897 | enum ip_conntrack_info ctinfo, int diff) |
2898 | { |
2899 | if (!(ct->status & IPS_NAT_MASK)) |
2900 | return; |
2901 | |
2902 | nf_ct_tcp_seqadj_set(skb, ct, ctinfo, off: diff); |
2903 | } |
2904 | |
2905 | static const struct nfnl_ct_hook ctnetlink_glue_hook = { |
2906 | .build_size = ctnetlink_glue_build_size, |
2907 | .build = ctnetlink_glue_build, |
2908 | .parse = ctnetlink_glue_parse, |
2909 | .attach_expect = ctnetlink_glue_attach_expect, |
2910 | .seq_adjust = ctnetlink_glue_seqadj, |
2911 | }; |
2912 | #endif /* CONFIG_NETFILTER_NETLINK_GLUE_CT */ |
2913 | |
2914 | /*********************************************************************** |
2915 | * EXPECT |
2916 | ***********************************************************************/ |
2917 | |
2918 | static int ctnetlink_exp_dump_tuple(struct sk_buff *skb, |
2919 | const struct nf_conntrack_tuple *tuple, |
2920 | u32 type) |
2921 | { |
2922 | struct nlattr *nest_parms; |
2923 | |
2924 | nest_parms = nla_nest_start(skb, attrtype: type); |
2925 | if (!nest_parms) |
2926 | goto nla_put_failure; |
2927 | if (ctnetlink_dump_tuples(skb, tuple) < 0) |
2928 | goto nla_put_failure; |
2929 | nla_nest_end(skb, start: nest_parms); |
2930 | |
2931 | return 0; |
2932 | |
2933 | nla_put_failure: |
2934 | return -1; |
2935 | } |
2936 | |
2937 | static int ctnetlink_exp_dump_mask(struct sk_buff *skb, |
2938 | const struct nf_conntrack_tuple *tuple, |
2939 | const struct nf_conntrack_tuple_mask *mask) |
2940 | { |
2941 | const struct nf_conntrack_l4proto *l4proto; |
2942 | struct nf_conntrack_tuple m; |
2943 | struct nlattr *nest_parms; |
2944 | int ret; |
2945 | |
2946 | memset(&m, 0xFF, sizeof(m)); |
2947 | memcpy(&m.src.u3, &mask->src.u3, sizeof(m.src.u3)); |
2948 | m.src.u.all = mask->src.u.all; |
2949 | m.src.l3num = tuple->src.l3num; |
2950 | m.dst.protonum = tuple->dst.protonum; |
2951 | |
2952 | nest_parms = nla_nest_start(skb, attrtype: CTA_EXPECT_MASK); |
2953 | if (!nest_parms) |
2954 | goto nla_put_failure; |
2955 | |
2956 | rcu_read_lock(); |
2957 | ret = ctnetlink_dump_tuples_ip(skb, tuple: &m); |
2958 | if (ret >= 0) { |
2959 | l4proto = nf_ct_l4proto_find(l4proto: tuple->dst.protonum); |
2960 | ret = ctnetlink_dump_tuples_proto(skb, tuple: &m, l4proto); |
2961 | } |
2962 | rcu_read_unlock(); |
2963 | |
2964 | if (unlikely(ret < 0)) |
2965 | goto nla_put_failure; |
2966 | |
2967 | nla_nest_end(skb, start: nest_parms); |
2968 | |
2969 | return 0; |
2970 | |
2971 | nla_put_failure: |
2972 | return -1; |
2973 | } |
2974 | |
2975 | #if IS_ENABLED(CONFIG_NF_NAT) |
2976 | static const union nf_inet_addr any_addr; |
2977 | #endif |
2978 | |
2979 | static __be32 nf_expect_get_id(const struct nf_conntrack_expect *exp) |
2980 | { |
2981 | static siphash_aligned_key_t exp_id_seed; |
2982 | unsigned long a, b, c, d; |
2983 | |
2984 | net_get_random_once(&exp_id_seed, sizeof(exp_id_seed)); |
2985 | |
2986 | a = (unsigned long)exp; |
2987 | b = (unsigned long)exp->helper; |
2988 | c = (unsigned long)exp->master; |
2989 | d = (unsigned long)siphash(data: &exp->tuple, len: sizeof(exp->tuple), key: &exp_id_seed); |
2990 | |
2991 | #ifdef CONFIG_64BIT |
2992 | return (__force __be32)siphash_4u64(a: (u64)a, b: (u64)b, c: (u64)c, d: (u64)d, key: &exp_id_seed); |
2993 | #else |
2994 | return (__force __be32)siphash_4u32((u32)a, (u32)b, (u32)c, (u32)d, &exp_id_seed); |
2995 | #endif |
2996 | } |
2997 | |
2998 | static int |
2999 | ctnetlink_exp_dump_expect(struct sk_buff *skb, |
3000 | const struct nf_conntrack_expect *exp) |
3001 | { |
3002 | struct nf_conn *master = exp->master; |
3003 | long timeout = ((long)exp->timeout.expires - (long)jiffies) / HZ; |
3004 | struct nf_conn_help *help; |
3005 | #if IS_ENABLED(CONFIG_NF_NAT) |
3006 | struct nlattr *nest_parms; |
3007 | struct nf_conntrack_tuple nat_tuple = {}; |
3008 | #endif |
3009 | struct nf_ct_helper_expectfn *expfn; |
3010 | |
3011 | if (timeout < 0) |
3012 | timeout = 0; |
3013 | |
3014 | if (ctnetlink_exp_dump_tuple(skb, tuple: &exp->tuple, type: CTA_EXPECT_TUPLE) < 0) |
3015 | goto nla_put_failure; |
3016 | if (ctnetlink_exp_dump_mask(skb, tuple: &exp->tuple, mask: &exp->mask) < 0) |
3017 | goto nla_put_failure; |
3018 | if (ctnetlink_exp_dump_tuple(skb, |
3019 | tuple: &master->tuplehash[IP_CT_DIR_ORIGINAL].tuple, |
3020 | type: CTA_EXPECT_MASTER) < 0) |
3021 | goto nla_put_failure; |
3022 | |
3023 | #if IS_ENABLED(CONFIG_NF_NAT) |
3024 | if (!nf_inet_addr_cmp(a1: &exp->saved_addr, a2: &any_addr) || |
3025 | exp->saved_proto.all) { |
3026 | nest_parms = nla_nest_start(skb, attrtype: CTA_EXPECT_NAT); |
3027 | if (!nest_parms) |
3028 | goto nla_put_failure; |
3029 | |
3030 | if (nla_put_be32(skb, attrtype: CTA_EXPECT_NAT_DIR, htonl(exp->dir))) |
3031 | goto nla_put_failure; |
3032 | |
3033 | nat_tuple.src.l3num = nf_ct_l3num(ct: master); |
3034 | nat_tuple.src.u3 = exp->saved_addr; |
3035 | nat_tuple.dst.protonum = nf_ct_protonum(ct: master); |
3036 | nat_tuple.src.u = exp->saved_proto; |
3037 | |
3038 | if (ctnetlink_exp_dump_tuple(skb, tuple: &nat_tuple, |
3039 | type: CTA_EXPECT_NAT_TUPLE) < 0) |
3040 | goto nla_put_failure; |
3041 | nla_nest_end(skb, start: nest_parms); |
3042 | } |
3043 | #endif |
3044 | if (nla_put_be32(skb, attrtype: CTA_EXPECT_TIMEOUT, htonl(timeout)) || |
3045 | nla_put_be32(skb, attrtype: CTA_EXPECT_ID, value: nf_expect_get_id(exp)) || |
3046 | nla_put_be32(skb, attrtype: CTA_EXPECT_FLAGS, htonl(exp->flags)) || |
3047 | nla_put_be32(skb, attrtype: CTA_EXPECT_CLASS, htonl(exp->class))) |
3048 | goto nla_put_failure; |
3049 | help = nfct_help(ct: master); |
3050 | if (help) { |
3051 | struct nf_conntrack_helper *helper; |
3052 | |
3053 | helper = rcu_dereference(help->helper); |
3054 | if (helper && |
3055 | nla_put_string(skb, attrtype: CTA_EXPECT_HELP_NAME, str: helper->name)) |
3056 | goto nla_put_failure; |
3057 | } |
3058 | expfn = nf_ct_helper_expectfn_find_by_symbol(symbol: exp->expectfn); |
3059 | if (expfn != NULL && |
3060 | nla_put_string(skb, attrtype: CTA_EXPECT_FN, str: expfn->name)) |
3061 | goto nla_put_failure; |
3062 | |
3063 | return 0; |
3064 | |
3065 | nla_put_failure: |
3066 | return -1; |
3067 | } |
3068 | |
3069 | static int |
3070 | ctnetlink_exp_fill_info(struct sk_buff *skb, u32 portid, u32 seq, |
3071 | int event, const struct nf_conntrack_expect *exp) |
3072 | { |
3073 | struct nlmsghdr *nlh; |
3074 | unsigned int flags = portid ? NLM_F_MULTI : 0; |
3075 | |
3076 | event = nfnl_msg_type(NFNL_SUBSYS_CTNETLINK_EXP, msg_type: event); |
3077 | nlh = nfnl_msg_put(skb, portid, seq, type: event, flags, |
3078 | family: exp->tuple.src.l3num, NFNETLINK_V0, res_id: 0); |
3079 | if (!nlh) |
3080 | goto nlmsg_failure; |
3081 | |
3082 | if (ctnetlink_exp_dump_expect(skb, exp) < 0) |
3083 | goto nla_put_failure; |
3084 | |
3085 | nlmsg_end(skb, nlh); |
3086 | return skb->len; |
3087 | |
3088 | nlmsg_failure: |
3089 | nla_put_failure: |
3090 | nlmsg_cancel(skb, nlh); |
3091 | return -1; |
3092 | } |
3093 | |
3094 | #ifdef CONFIG_NF_CONNTRACK_EVENTS |
3095 | static int |
3096 | ctnetlink_expect_event(unsigned int events, const struct nf_exp_event *item) |
3097 | { |
3098 | struct nf_conntrack_expect *exp = item->exp; |
3099 | struct net *net = nf_ct_exp_net(exp); |
3100 | struct nlmsghdr *nlh; |
3101 | struct sk_buff *skb; |
3102 | unsigned int type, group; |
3103 | int flags = 0; |
3104 | |
3105 | if (events & (1 << IPEXP_DESTROY)) { |
3106 | type = IPCTNL_MSG_EXP_DELETE; |
3107 | group = NFNLGRP_CONNTRACK_EXP_DESTROY; |
3108 | } else if (events & (1 << IPEXP_NEW)) { |
3109 | type = IPCTNL_MSG_EXP_NEW; |
3110 | flags = NLM_F_CREATE|NLM_F_EXCL; |
3111 | group = NFNLGRP_CONNTRACK_EXP_NEW; |
3112 | } else |
3113 | return 0; |
3114 | |
3115 | if (!item->report && !nfnetlink_has_listeners(net, group)) |
3116 | return 0; |
3117 | |
3118 | skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC); |
3119 | if (skb == NULL) |
3120 | goto errout; |
3121 | |
3122 | type = nfnl_msg_type(NFNL_SUBSYS_CTNETLINK_EXP, msg_type: type); |
3123 | nlh = nfnl_msg_put(skb, portid: item->portid, seq: 0, type, flags, |
3124 | family: exp->tuple.src.l3num, NFNETLINK_V0, res_id: 0); |
3125 | if (!nlh) |
3126 | goto nlmsg_failure; |
3127 | |
3128 | if (ctnetlink_exp_dump_expect(skb, exp) < 0) |
3129 | goto nla_put_failure; |
3130 | |
3131 | nlmsg_end(skb, nlh); |
3132 | nfnetlink_send(skb, net, portid: item->portid, group, echo: item->report, GFP_ATOMIC); |
3133 | return 0; |
3134 | |
3135 | nla_put_failure: |
3136 | nlmsg_cancel(skb, nlh); |
3137 | nlmsg_failure: |
3138 | kfree_skb(skb); |
3139 | errout: |
3140 | nfnetlink_set_err(net, portid: 0, group: 0, error: -ENOBUFS); |
3141 | return 0; |
3142 | } |
3143 | #endif |
3144 | static int ctnetlink_exp_done(struct netlink_callback *cb) |
3145 | { |
3146 | if (cb->args[1]) |
3147 | nf_ct_expect_put(exp: (struct nf_conntrack_expect *)cb->args[1]); |
3148 | return 0; |
3149 | } |
3150 | |
3151 | static int |
3152 | ctnetlink_exp_dump_table(struct sk_buff *skb, struct netlink_callback *cb) |
3153 | { |
3154 | struct net *net = sock_net(sk: skb->sk); |
3155 | struct nf_conntrack_expect *exp, *last; |
3156 | struct nfgenmsg *nfmsg = nlmsg_data(nlh: cb->nlh); |
3157 | u_int8_t l3proto = nfmsg->nfgen_family; |
3158 | |
3159 | rcu_read_lock(); |
3160 | last = (struct nf_conntrack_expect *)cb->args[1]; |
3161 | for (; cb->args[0] < nf_ct_expect_hsize; cb->args[0]++) { |
3162 | restart: |
3163 | hlist_for_each_entry_rcu(exp, &nf_ct_expect_hash[cb->args[0]], |
3164 | hnode) { |
3165 | if (l3proto && exp->tuple.src.l3num != l3proto) |
3166 | continue; |
3167 | |
3168 | if (!net_eq(net1: nf_ct_net(ct: exp->master), net2: net)) |
3169 | continue; |
3170 | |
3171 | if (cb->args[1]) { |
3172 | if (exp != last) |
3173 | continue; |
3174 | cb->args[1] = 0; |
3175 | } |
3176 | if (ctnetlink_exp_fill_info(skb, |
3177 | NETLINK_CB(cb->skb).portid, |
3178 | seq: cb->nlh->nlmsg_seq, |
3179 | event: IPCTNL_MSG_EXP_NEW, |
3180 | exp) < 0) { |
3181 | if (!refcount_inc_not_zero(r: &exp->use)) |
3182 | continue; |
3183 | cb->args[1] = (unsigned long)exp; |
3184 | goto out; |
3185 | } |
3186 | } |
3187 | if (cb->args[1]) { |
3188 | cb->args[1] = 0; |
3189 | goto restart; |
3190 | } |
3191 | } |
3192 | out: |
3193 | rcu_read_unlock(); |
3194 | if (last) |
3195 | nf_ct_expect_put(exp: last); |
3196 | |
3197 | return skb->len; |
3198 | } |
3199 | |
3200 | static int |
3201 | ctnetlink_exp_ct_dump_table(struct sk_buff *skb, struct netlink_callback *cb) |
3202 | { |
3203 | struct nf_conntrack_expect *exp, *last; |
3204 | struct nfgenmsg *nfmsg = nlmsg_data(nlh: cb->nlh); |
3205 | struct nf_conn *ct = cb->data; |
3206 | struct nf_conn_help *help = nfct_help(ct); |
3207 | u_int8_t l3proto = nfmsg->nfgen_family; |
3208 | |
3209 | if (cb->args[0]) |
3210 | return 0; |
3211 | |
3212 | rcu_read_lock(); |
3213 | last = (struct nf_conntrack_expect *)cb->args[1]; |
3214 | restart: |
3215 | hlist_for_each_entry_rcu(exp, &help->expectations, lnode) { |
3216 | if (l3proto && exp->tuple.src.l3num != l3proto) |
3217 | continue; |
3218 | if (cb->args[1]) { |
3219 | if (exp != last) |
3220 | continue; |
3221 | cb->args[1] = 0; |
3222 | } |
3223 | if (ctnetlink_exp_fill_info(skb, NETLINK_CB(cb->skb).portid, |
3224 | seq: cb->nlh->nlmsg_seq, |
3225 | event: IPCTNL_MSG_EXP_NEW, |
3226 | exp) < 0) { |
3227 | if (!refcount_inc_not_zero(r: &exp->use)) |
3228 | continue; |
3229 | cb->args[1] = (unsigned long)exp; |
3230 | goto out; |
3231 | } |
3232 | } |
3233 | if (cb->args[1]) { |
3234 | cb->args[1] = 0; |
3235 | goto restart; |
3236 | } |
3237 | cb->args[0] = 1; |
3238 | out: |
3239 | rcu_read_unlock(); |
3240 | if (last) |
3241 | nf_ct_expect_put(exp: last); |
3242 | |
3243 | return skb->len; |
3244 | } |
3245 | |
3246 | static int ctnetlink_dump_exp_ct(struct net *net, struct sock *ctnl, |
3247 | struct sk_buff *skb, |
3248 | const struct nlmsghdr *nlh, |
3249 | const struct nlattr * const cda[], |
3250 | struct netlink_ext_ack *extack) |
3251 | { |
3252 | int err; |
3253 | struct nfgenmsg *nfmsg = nlmsg_data(nlh); |
3254 | u_int8_t u3 = nfmsg->nfgen_family; |
3255 | struct nf_conntrack_tuple tuple; |
3256 | struct nf_conntrack_tuple_hash *h; |
3257 | struct nf_conn *ct; |
3258 | struct nf_conntrack_zone zone; |
3259 | struct netlink_dump_control c = { |
3260 | .dump = ctnetlink_exp_ct_dump_table, |
3261 | .done = ctnetlink_exp_done, |
3262 | }; |
3263 | |
3264 | err = ctnetlink_parse_tuple(cda, tuple: &tuple, type: CTA_EXPECT_MASTER, |
3265 | l3num: u3, NULL); |
3266 | if (err < 0) |
3267 | return err; |
3268 | |
3269 | err = ctnetlink_parse_zone(attr: cda[CTA_EXPECT_ZONE], zone: &zone); |
3270 | if (err < 0) |
3271 | return err; |
3272 | |
3273 | h = nf_conntrack_find_get(net, zone: &zone, tuple: &tuple); |
3274 | if (!h) |
3275 | return -ENOENT; |
3276 | |
3277 | ct = nf_ct_tuplehash_to_ctrack(hash: h); |
3278 | /* No expectation linked to this connection tracking. */ |
3279 | if (!nfct_help(ct)) { |
3280 | nf_ct_put(ct); |
3281 | return 0; |
3282 | } |
3283 | |
3284 | c.data = ct; |
3285 | |
3286 | err = netlink_dump_start(ssk: ctnl, skb, nlh, control: &c); |
3287 | nf_ct_put(ct); |
3288 | |
3289 | return err; |
3290 | } |
3291 | |
3292 | static int ctnetlink_get_expect(struct sk_buff *skb, |
3293 | const struct nfnl_info *info, |
3294 | const struct nlattr * const cda[]) |
3295 | { |
3296 | u_int8_t u3 = info->nfmsg->nfgen_family; |
3297 | struct nf_conntrack_tuple tuple; |
3298 | struct nf_conntrack_expect *exp; |
3299 | struct nf_conntrack_zone zone; |
3300 | struct sk_buff *skb2; |
3301 | int err; |
3302 | |
3303 | if (info->nlh->nlmsg_flags & NLM_F_DUMP) { |
3304 | if (cda[CTA_EXPECT_MASTER]) |
3305 | return ctnetlink_dump_exp_ct(net: info->net, ctnl: info->sk, skb, |
3306 | nlh: info->nlh, cda, |
3307 | extack: info->extack); |
3308 | else { |
3309 | struct netlink_dump_control c = { |
3310 | .dump = ctnetlink_exp_dump_table, |
3311 | .done = ctnetlink_exp_done, |
3312 | }; |
3313 | return netlink_dump_start(ssk: info->sk, skb, nlh: info->nlh, control: &c); |
3314 | } |
3315 | } |
3316 | |
3317 | err = ctnetlink_parse_zone(attr: cda[CTA_EXPECT_ZONE], zone: &zone); |
3318 | if (err < 0) |
3319 | return err; |
3320 | |
3321 | if (cda[CTA_EXPECT_TUPLE]) |
3322 | err = ctnetlink_parse_tuple(cda, tuple: &tuple, type: CTA_EXPECT_TUPLE, |
3323 | l3num: u3, NULL); |
3324 | else if (cda[CTA_EXPECT_MASTER]) |
3325 | err = ctnetlink_parse_tuple(cda, tuple: &tuple, type: CTA_EXPECT_MASTER, |
3326 | l3num: u3, NULL); |
3327 | else |
3328 | return -EINVAL; |
3329 | |
3330 | if (err < 0) |
3331 | return err; |
3332 | |
3333 | exp = nf_ct_expect_find_get(net: info->net, zone: &zone, tuple: &tuple); |
3334 | if (!exp) |
3335 | return -ENOENT; |
3336 | |
3337 | if (cda[CTA_EXPECT_ID]) { |
3338 | __be32 id = nla_get_be32(nla: cda[CTA_EXPECT_ID]); |
3339 | |
3340 | if (id != nf_expect_get_id(exp)) { |
3341 | nf_ct_expect_put(exp); |
3342 | return -ENOENT; |
3343 | } |
3344 | } |
3345 | |
3346 | skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); |
3347 | if (!skb2) { |
3348 | nf_ct_expect_put(exp); |
3349 | return -ENOMEM; |
3350 | } |
3351 | |
3352 | rcu_read_lock(); |
3353 | err = ctnetlink_exp_fill_info(skb: skb2, NETLINK_CB(skb).portid, |
3354 | seq: info->nlh->nlmsg_seq, event: IPCTNL_MSG_EXP_NEW, |
3355 | exp); |
3356 | rcu_read_unlock(); |
3357 | nf_ct_expect_put(exp); |
3358 | if (err <= 0) { |
3359 | kfree_skb(skb: skb2); |
3360 | return -ENOMEM; |
3361 | } |
3362 | |
3363 | return nfnetlink_unicast(skb: skb2, net: info->net, NETLINK_CB(skb).portid); |
3364 | } |
3365 | |
3366 | static bool expect_iter_name(struct nf_conntrack_expect *exp, void *data) |
3367 | { |
3368 | struct nf_conntrack_helper *helper; |
3369 | const struct nf_conn_help *m_help; |
3370 | const char *name = data; |
3371 | |
3372 | m_help = nfct_help(ct: exp->master); |
3373 | |
3374 | helper = rcu_dereference(m_help->helper); |
3375 | if (!helper) |
3376 | return false; |
3377 | |
3378 | return strcmp(helper->name, name) == 0; |
3379 | } |
3380 | |
3381 | static bool expect_iter_all(struct nf_conntrack_expect *exp, void *data) |
3382 | { |
3383 | return true; |
3384 | } |
3385 | |
3386 | static int ctnetlink_del_expect(struct sk_buff *skb, |
3387 | const struct nfnl_info *info, |
3388 | const struct nlattr * const cda[]) |
3389 | { |
3390 | u_int8_t u3 = info->nfmsg->nfgen_family; |
3391 | struct nf_conntrack_expect *exp; |
3392 | struct nf_conntrack_tuple tuple; |
3393 | struct nf_conntrack_zone zone; |
3394 | int err; |
3395 | |
3396 | if (cda[CTA_EXPECT_TUPLE]) { |
3397 | /* delete a single expect by tuple */ |
3398 | err = ctnetlink_parse_zone(attr: cda[CTA_EXPECT_ZONE], zone: &zone); |
3399 | if (err < 0) |
3400 | return err; |
3401 | |
3402 | err = ctnetlink_parse_tuple(cda, tuple: &tuple, type: CTA_EXPECT_TUPLE, |
3403 | l3num: u3, NULL); |
3404 | if (err < 0) |
3405 | return err; |
3406 | |
3407 | /* bump usage count to 2 */ |
3408 | exp = nf_ct_expect_find_get(net: info->net, zone: &zone, tuple: &tuple); |
3409 | if (!exp) |
3410 | return -ENOENT; |
3411 | |
3412 | if (cda[CTA_EXPECT_ID]) { |
3413 | __be32 id = nla_get_be32(nla: cda[CTA_EXPECT_ID]); |
3414 | if (ntohl(id) != (u32)(unsigned long)exp) { |
3415 | nf_ct_expect_put(exp); |
3416 | return -ENOENT; |
3417 | } |
3418 | } |
3419 | |
3420 | /* after list removal, usage count == 1 */ |
3421 | spin_lock_bh(lock: &nf_conntrack_expect_lock); |
3422 | if (del_timer(timer: &exp->timeout)) { |
3423 | nf_ct_unlink_expect_report(exp, NETLINK_CB(skb).portid, |
3424 | report: nlmsg_report(nlh: info->nlh)); |
3425 | nf_ct_expect_put(exp); |
3426 | } |
3427 | spin_unlock_bh(lock: &nf_conntrack_expect_lock); |
3428 | /* have to put what we 'get' above. |
3429 | * after this line usage count == 0 */ |
3430 | nf_ct_expect_put(exp); |
3431 | } else if (cda[CTA_EXPECT_HELP_NAME]) { |
3432 | char *name = nla_data(nla: cda[CTA_EXPECT_HELP_NAME]); |
3433 | |
3434 | nf_ct_expect_iterate_net(net: info->net, iter: expect_iter_name, data: name, |
3435 | NETLINK_CB(skb).portid, |
3436 | report: nlmsg_report(nlh: info->nlh)); |
3437 | } else { |
3438 | /* This basically means we have to flush everything*/ |
3439 | nf_ct_expect_iterate_net(net: info->net, iter: expect_iter_all, NULL, |
3440 | NETLINK_CB(skb).portid, |
3441 | report: nlmsg_report(nlh: info->nlh)); |
3442 | } |
3443 | |
3444 | return 0; |
3445 | } |
3446 | static int |
3447 | ctnetlink_change_expect(struct nf_conntrack_expect *x, |
3448 | const struct nlattr * const cda[]) |
3449 | { |
3450 | if (cda[CTA_EXPECT_TIMEOUT]) { |
3451 | if (!del_timer(timer: &x->timeout)) |
3452 | return -ETIME; |
3453 | |
3454 | x->timeout.expires = jiffies + |
3455 | ntohl(nla_get_be32(cda[CTA_EXPECT_TIMEOUT])) * HZ; |
3456 | add_timer(timer: &x->timeout); |
3457 | } |
3458 | return 0; |
3459 | } |
3460 | |
3461 | #if IS_ENABLED(CONFIG_NF_NAT) |
3462 | static const struct nla_policy exp_nat_nla_policy[CTA_EXPECT_NAT_MAX+1] = { |
3463 | [CTA_EXPECT_NAT_DIR] = { .type = NLA_U32 }, |
3464 | [CTA_EXPECT_NAT_TUPLE] = { .type = NLA_NESTED }, |
3465 | }; |
3466 | #endif |
3467 | |
3468 | static int |
3469 | ctnetlink_parse_expect_nat(const struct nlattr *attr, |
3470 | struct nf_conntrack_expect *exp, |
3471 | u_int8_t u3) |
3472 | { |
3473 | #if IS_ENABLED(CONFIG_NF_NAT) |
3474 | struct nlattr *tb[CTA_EXPECT_NAT_MAX+1]; |
3475 | struct nf_conntrack_tuple nat_tuple = {}; |
3476 | int err; |
3477 | |
3478 | err = nla_parse_nested_deprecated(tb, CTA_EXPECT_NAT_MAX, nla: attr, |
3479 | policy: exp_nat_nla_policy, NULL); |
3480 | if (err < 0) |
3481 | return err; |
3482 | |
3483 | if (!tb[CTA_EXPECT_NAT_DIR] || !tb[CTA_EXPECT_NAT_TUPLE]) |
3484 | return -EINVAL; |
3485 | |
3486 | err = ctnetlink_parse_tuple(cda: (const struct nlattr * const *)tb, |
3487 | tuple: &nat_tuple, type: CTA_EXPECT_NAT_TUPLE, |
3488 | l3num: u3, NULL); |
3489 | if (err < 0) |
3490 | return err; |
3491 | |
3492 | exp->saved_addr = nat_tuple.src.u3; |
3493 | exp->saved_proto = nat_tuple.src.u; |
3494 | exp->dir = ntohl(nla_get_be32(tb[CTA_EXPECT_NAT_DIR])); |
3495 | |
3496 | return 0; |
3497 | #else |
3498 | return -EOPNOTSUPP; |
3499 | #endif |
3500 | } |
3501 | |
3502 | static struct nf_conntrack_expect * |
3503 | ctnetlink_alloc_expect(const struct nlattr * const cda[], struct nf_conn *ct, |
3504 | struct nf_conntrack_helper *helper, |
3505 | struct nf_conntrack_tuple *tuple, |
3506 | struct nf_conntrack_tuple *mask) |
3507 | { |
3508 | u_int32_t class = 0; |
3509 | struct nf_conntrack_expect *exp; |
3510 | struct nf_conn_help *help; |
3511 | int err; |
3512 | |
3513 | help = nfct_help(ct); |
3514 | if (!help) |
3515 | return ERR_PTR(error: -EOPNOTSUPP); |
3516 | |
3517 | if (cda[CTA_EXPECT_CLASS] && helper) { |
3518 | class = ntohl(nla_get_be32(cda[CTA_EXPECT_CLASS])); |
3519 | if (class > helper->expect_class_max) |
3520 | return ERR_PTR(error: -EINVAL); |
3521 | } |
3522 | exp = nf_ct_expect_alloc(me: ct); |
3523 | if (!exp) |
3524 | return ERR_PTR(error: -ENOMEM); |
3525 | |
3526 | if (cda[CTA_EXPECT_FLAGS]) { |
3527 | exp->flags = ntohl(nla_get_be32(cda[CTA_EXPECT_FLAGS])); |
3528 | exp->flags &= ~NF_CT_EXPECT_USERSPACE; |
3529 | } else { |
3530 | exp->flags = 0; |
3531 | } |
3532 | if (cda[CTA_EXPECT_FN]) { |
3533 | const char *name = nla_data(nla: cda[CTA_EXPECT_FN]); |
3534 | struct nf_ct_helper_expectfn *expfn; |
3535 | |
3536 | expfn = nf_ct_helper_expectfn_find_by_name(name); |
3537 | if (expfn == NULL) { |
3538 | err = -EINVAL; |
3539 | goto err_out; |
3540 | } |
3541 | exp->expectfn = expfn->expectfn; |
3542 | } else |
3543 | exp->expectfn = NULL; |
3544 | |
3545 | exp->class = class; |
3546 | exp->master = ct; |
3547 | exp->helper = helper; |
3548 | exp->tuple = *tuple; |
3549 | exp->mask.src.u3 = mask->src.u3; |
3550 | exp->mask.src.u.all = mask->src.u.all; |
3551 | |
3552 | if (cda[CTA_EXPECT_NAT]) { |
3553 | err = ctnetlink_parse_expect_nat(attr: cda[CTA_EXPECT_NAT], |
3554 | exp, u3: nf_ct_l3num(ct)); |
3555 | if (err < 0) |
3556 | goto err_out; |
3557 | } |
3558 | return exp; |
3559 | err_out: |
3560 | nf_ct_expect_put(exp); |
3561 | return ERR_PTR(error: err); |
3562 | } |
3563 | |
3564 | static int |
3565 | ctnetlink_create_expect(struct net *net, |
3566 | const struct nf_conntrack_zone *zone, |
3567 | const struct nlattr * const cda[], |
3568 | u_int8_t u3, u32 portid, int report) |
3569 | { |
3570 | struct nf_conntrack_tuple tuple, mask, master_tuple; |
3571 | struct nf_conntrack_tuple_hash *h = NULL; |
3572 | struct nf_conntrack_helper *helper = NULL; |
3573 | struct nf_conntrack_expect *exp; |
3574 | struct nf_conn *ct; |
3575 | int err; |
3576 | |
3577 | /* caller guarantees that those three CTA_EXPECT_* exist */ |
3578 | err = ctnetlink_parse_tuple(cda, tuple: &tuple, type: CTA_EXPECT_TUPLE, |
3579 | l3num: u3, NULL); |
3580 | if (err < 0) |
3581 | return err; |
3582 | err = ctnetlink_parse_tuple(cda, tuple: &mask, type: CTA_EXPECT_MASK, |
3583 | l3num: u3, NULL); |
3584 | if (err < 0) |
3585 | return err; |
3586 | err = ctnetlink_parse_tuple(cda, tuple: &master_tuple, type: CTA_EXPECT_MASTER, |
3587 | l3num: u3, NULL); |
3588 | if (err < 0) |
3589 | return err; |
3590 | |
3591 | /* Look for master conntrack of this expectation */ |
3592 | h = nf_conntrack_find_get(net, zone, tuple: &master_tuple); |
3593 | if (!h) |
3594 | return -ENOENT; |
3595 | ct = nf_ct_tuplehash_to_ctrack(hash: h); |
3596 | |
3597 | rcu_read_lock(); |
3598 | if (cda[CTA_EXPECT_HELP_NAME]) { |
3599 | const char *helpname = nla_data(nla: cda[CTA_EXPECT_HELP_NAME]); |
3600 | |
3601 | helper = __nf_conntrack_helper_find(name: helpname, l3num: u3, |
3602 | protonum: nf_ct_protonum(ct)); |
3603 | if (helper == NULL) { |
3604 | rcu_read_unlock(); |
3605 | #ifdef CONFIG_MODULES |
3606 | if (request_module("nfct-helper-%s" , helpname) < 0) { |
3607 | err = -EOPNOTSUPP; |
3608 | goto err_ct; |
3609 | } |
3610 | rcu_read_lock(); |
3611 | helper = __nf_conntrack_helper_find(name: helpname, l3num: u3, |
3612 | protonum: nf_ct_protonum(ct)); |
3613 | if (helper) { |
3614 | err = -EAGAIN; |
3615 | goto err_rcu; |
3616 | } |
3617 | rcu_read_unlock(); |
3618 | #endif |
3619 | err = -EOPNOTSUPP; |
3620 | goto err_ct; |
3621 | } |
3622 | } |
3623 | |
3624 | exp = ctnetlink_alloc_expect(cda, ct, helper, tuple: &tuple, mask: &mask); |
3625 | if (IS_ERR(ptr: exp)) { |
3626 | err = PTR_ERR(ptr: exp); |
3627 | goto err_rcu; |
3628 | } |
3629 | |
3630 | err = nf_ct_expect_related_report(expect: exp, portid, report, flags: 0); |
3631 | nf_ct_expect_put(exp); |
3632 | err_rcu: |
3633 | rcu_read_unlock(); |
3634 | err_ct: |
3635 | nf_ct_put(ct); |
3636 | return err; |
3637 | } |
3638 | |
3639 | static int ctnetlink_new_expect(struct sk_buff *skb, |
3640 | const struct nfnl_info *info, |
3641 | const struct nlattr * const cda[]) |
3642 | { |
3643 | u_int8_t u3 = info->nfmsg->nfgen_family; |
3644 | struct nf_conntrack_tuple tuple; |
3645 | struct nf_conntrack_expect *exp; |
3646 | struct nf_conntrack_zone zone; |
3647 | int err; |
3648 | |
3649 | if (!cda[CTA_EXPECT_TUPLE] |
3650 | || !cda[CTA_EXPECT_MASK] |
3651 | || !cda[CTA_EXPECT_MASTER]) |
3652 | return -EINVAL; |
3653 | |
3654 | err = ctnetlink_parse_zone(attr: cda[CTA_EXPECT_ZONE], zone: &zone); |
3655 | if (err < 0) |
3656 | return err; |
3657 | |
3658 | err = ctnetlink_parse_tuple(cda, tuple: &tuple, type: CTA_EXPECT_TUPLE, |
3659 | l3num: u3, NULL); |
3660 | if (err < 0) |
3661 | return err; |
3662 | |
3663 | spin_lock_bh(lock: &nf_conntrack_expect_lock); |
3664 | exp = __nf_ct_expect_find(net: info->net, zone: &zone, tuple: &tuple); |
3665 | if (!exp) { |
3666 | spin_unlock_bh(lock: &nf_conntrack_expect_lock); |
3667 | err = -ENOENT; |
3668 | if (info->nlh->nlmsg_flags & NLM_F_CREATE) { |
3669 | err = ctnetlink_create_expect(net: info->net, zone: &zone, cda, u3, |
3670 | NETLINK_CB(skb).portid, |
3671 | report: nlmsg_report(nlh: info->nlh)); |
3672 | } |
3673 | return err; |
3674 | } |
3675 | |
3676 | err = -EEXIST; |
3677 | if (!(info->nlh->nlmsg_flags & NLM_F_EXCL)) |
3678 | err = ctnetlink_change_expect(x: exp, cda); |
3679 | spin_unlock_bh(lock: &nf_conntrack_expect_lock); |
3680 | |
3681 | return err; |
3682 | } |
3683 | |
3684 | static int |
3685 | ctnetlink_exp_stat_fill_info(struct sk_buff *skb, u32 portid, u32 seq, int cpu, |
3686 | const struct ip_conntrack_stat *st) |
3687 | { |
3688 | struct nlmsghdr *nlh; |
3689 | unsigned int flags = portid ? NLM_F_MULTI : 0, event; |
3690 | |
3691 | event = nfnl_msg_type(NFNL_SUBSYS_CTNETLINK, |
3692 | msg_type: IPCTNL_MSG_EXP_GET_STATS_CPU); |
3693 | nlh = nfnl_msg_put(skb, portid, seq, type: event, flags, AF_UNSPEC, |
3694 | NFNETLINK_V0, htons(cpu)); |
3695 | if (!nlh) |
3696 | goto nlmsg_failure; |
3697 | |
3698 | if (nla_put_be32(skb, attrtype: CTA_STATS_EXP_NEW, htonl(st->expect_new)) || |
3699 | nla_put_be32(skb, attrtype: CTA_STATS_EXP_CREATE, htonl(st->expect_create)) || |
3700 | nla_put_be32(skb, attrtype: CTA_STATS_EXP_DELETE, htonl(st->expect_delete))) |
3701 | goto nla_put_failure; |
3702 | |
3703 | nlmsg_end(skb, nlh); |
3704 | return skb->len; |
3705 | |
3706 | nla_put_failure: |
3707 | nlmsg_failure: |
3708 | nlmsg_cancel(skb, nlh); |
3709 | return -1; |
3710 | } |
3711 | |
3712 | static int |
3713 | ctnetlink_exp_stat_cpu_dump(struct sk_buff *skb, struct netlink_callback *cb) |
3714 | { |
3715 | int cpu; |
3716 | struct net *net = sock_net(sk: skb->sk); |
3717 | |
3718 | if (cb->args[0] == nr_cpu_ids) |
3719 | return 0; |
3720 | |
3721 | for (cpu = cb->args[0]; cpu < nr_cpu_ids; cpu++) { |
3722 | const struct ip_conntrack_stat *st; |
3723 | |
3724 | if (!cpu_possible(cpu)) |
3725 | continue; |
3726 | |
3727 | st = per_cpu_ptr(net->ct.stat, cpu); |
3728 | if (ctnetlink_exp_stat_fill_info(skb, NETLINK_CB(cb->skb).portid, |
3729 | seq: cb->nlh->nlmsg_seq, |
3730 | cpu, st) < 0) |
3731 | break; |
3732 | } |
3733 | cb->args[0] = cpu; |
3734 | |
3735 | return skb->len; |
3736 | } |
3737 | |
3738 | static int ctnetlink_stat_exp_cpu(struct sk_buff *skb, |
3739 | const struct nfnl_info *info, |
3740 | const struct nlattr * const cda[]) |
3741 | { |
3742 | if (info->nlh->nlmsg_flags & NLM_F_DUMP) { |
3743 | struct netlink_dump_control c = { |
3744 | .dump = ctnetlink_exp_stat_cpu_dump, |
3745 | }; |
3746 | return netlink_dump_start(ssk: info->sk, skb, nlh: info->nlh, control: &c); |
3747 | } |
3748 | |
3749 | return 0; |
3750 | } |
3751 | |
3752 | #ifdef CONFIG_NF_CONNTRACK_EVENTS |
3753 | static struct nf_ct_event_notifier ctnl_notifier = { |
3754 | .ct_event = ctnetlink_conntrack_event, |
3755 | .exp_event = ctnetlink_expect_event, |
3756 | }; |
3757 | #endif |
3758 | |
3759 | static const struct nfnl_callback ctnl_cb[IPCTNL_MSG_MAX] = { |
3760 | [IPCTNL_MSG_CT_NEW] = { |
3761 | .call = ctnetlink_new_conntrack, |
3762 | .type = NFNL_CB_MUTEX, |
3763 | .attr_count = CTA_MAX, |
3764 | .policy = ct_nla_policy |
3765 | }, |
3766 | [IPCTNL_MSG_CT_GET] = { |
3767 | .call = ctnetlink_get_conntrack, |
3768 | .type = NFNL_CB_MUTEX, |
3769 | .attr_count = CTA_MAX, |
3770 | .policy = ct_nla_policy |
3771 | }, |
3772 | [IPCTNL_MSG_CT_DELETE] = { |
3773 | .call = ctnetlink_del_conntrack, |
3774 | .type = NFNL_CB_MUTEX, |
3775 | .attr_count = CTA_MAX, |
3776 | .policy = ct_nla_policy |
3777 | }, |
3778 | [IPCTNL_MSG_CT_GET_CTRZERO] = { |
3779 | .call = ctnetlink_get_conntrack, |
3780 | .type = NFNL_CB_MUTEX, |
3781 | .attr_count = CTA_MAX, |
3782 | .policy = ct_nla_policy |
3783 | }, |
3784 | [IPCTNL_MSG_CT_GET_STATS_CPU] = { |
3785 | .call = ctnetlink_stat_ct_cpu, |
3786 | .type = NFNL_CB_MUTEX, |
3787 | }, |
3788 | [IPCTNL_MSG_CT_GET_STATS] = { |
3789 | .call = ctnetlink_stat_ct, |
3790 | .type = NFNL_CB_MUTEX, |
3791 | }, |
3792 | [IPCTNL_MSG_CT_GET_DYING] = { |
3793 | .call = ctnetlink_get_ct_dying, |
3794 | .type = NFNL_CB_MUTEX, |
3795 | }, |
3796 | [IPCTNL_MSG_CT_GET_UNCONFIRMED] = { |
3797 | .call = ctnetlink_get_ct_unconfirmed, |
3798 | .type = NFNL_CB_MUTEX, |
3799 | }, |
3800 | }; |
3801 | |
3802 | static const struct nfnl_callback ctnl_exp_cb[IPCTNL_MSG_EXP_MAX] = { |
3803 | [IPCTNL_MSG_EXP_GET] = { |
3804 | .call = ctnetlink_get_expect, |
3805 | .type = NFNL_CB_MUTEX, |
3806 | .attr_count = CTA_EXPECT_MAX, |
3807 | .policy = exp_nla_policy |
3808 | }, |
3809 | [IPCTNL_MSG_EXP_NEW] = { |
3810 | .call = ctnetlink_new_expect, |
3811 | .type = NFNL_CB_MUTEX, |
3812 | .attr_count = CTA_EXPECT_MAX, |
3813 | .policy = exp_nla_policy |
3814 | }, |
3815 | [IPCTNL_MSG_EXP_DELETE] = { |
3816 | .call = ctnetlink_del_expect, |
3817 | .type = NFNL_CB_MUTEX, |
3818 | .attr_count = CTA_EXPECT_MAX, |
3819 | .policy = exp_nla_policy |
3820 | }, |
3821 | [IPCTNL_MSG_EXP_GET_STATS_CPU] = { |
3822 | .call = ctnetlink_stat_exp_cpu, |
3823 | .type = NFNL_CB_MUTEX, |
3824 | }, |
3825 | }; |
3826 | |
3827 | static const struct nfnetlink_subsystem ctnl_subsys = { |
3828 | .name = "conntrack" , |
3829 | .subsys_id = NFNL_SUBSYS_CTNETLINK, |
3830 | .cb_count = IPCTNL_MSG_MAX, |
3831 | .cb = ctnl_cb, |
3832 | }; |
3833 | |
3834 | static const struct nfnetlink_subsystem ctnl_exp_subsys = { |
3835 | .name = "conntrack_expect" , |
3836 | .subsys_id = NFNL_SUBSYS_CTNETLINK_EXP, |
3837 | .cb_count = IPCTNL_MSG_EXP_MAX, |
3838 | .cb = ctnl_exp_cb, |
3839 | }; |
3840 | |
3841 | MODULE_ALIAS("ip_conntrack_netlink" ); |
3842 | MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK); |
3843 | MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK_EXP); |
3844 | |
3845 | static int __net_init ctnetlink_net_init(struct net *net) |
3846 | { |
3847 | #ifdef CONFIG_NF_CONNTRACK_EVENTS |
3848 | nf_conntrack_register_notifier(net, nb: &ctnl_notifier); |
3849 | #endif |
3850 | return 0; |
3851 | } |
3852 | |
3853 | static void ctnetlink_net_pre_exit(struct net *net) |
3854 | { |
3855 | #ifdef CONFIG_NF_CONNTRACK_EVENTS |
3856 | nf_conntrack_unregister_notifier(net); |
3857 | #endif |
3858 | } |
3859 | |
3860 | static struct pernet_operations ctnetlink_net_ops = { |
3861 | .init = ctnetlink_net_init, |
3862 | .pre_exit = ctnetlink_net_pre_exit, |
3863 | }; |
3864 | |
3865 | static int __init ctnetlink_init(void) |
3866 | { |
3867 | int ret; |
3868 | |
3869 | NL_ASSERT_DUMP_CTX_FITS(struct ctnetlink_list_dump_ctx); |
3870 | |
3871 | ret = nfnetlink_subsys_register(n: &ctnl_subsys); |
3872 | if (ret < 0) { |
3873 | pr_err("ctnetlink_init: cannot register with nfnetlink.\n" ); |
3874 | goto err_out; |
3875 | } |
3876 | |
3877 | ret = nfnetlink_subsys_register(n: &ctnl_exp_subsys); |
3878 | if (ret < 0) { |
3879 | pr_err("ctnetlink_init: cannot register exp with nfnetlink.\n" ); |
3880 | goto err_unreg_subsys; |
3881 | } |
3882 | |
3883 | ret = register_pernet_subsys(&ctnetlink_net_ops); |
3884 | if (ret < 0) { |
3885 | pr_err("ctnetlink_init: cannot register pernet operations\n" ); |
3886 | goto err_unreg_exp_subsys; |
3887 | } |
3888 | #ifdef CONFIG_NETFILTER_NETLINK_GLUE_CT |
3889 | /* setup interaction between nf_queue and nf_conntrack_netlink. */ |
3890 | RCU_INIT_POINTER(nfnl_ct_hook, &ctnetlink_glue_hook); |
3891 | #endif |
3892 | return 0; |
3893 | |
3894 | err_unreg_exp_subsys: |
3895 | nfnetlink_subsys_unregister(n: &ctnl_exp_subsys); |
3896 | err_unreg_subsys: |
3897 | nfnetlink_subsys_unregister(n: &ctnl_subsys); |
3898 | err_out: |
3899 | return ret; |
3900 | } |
3901 | |
3902 | static void __exit ctnetlink_exit(void) |
3903 | { |
3904 | unregister_pernet_subsys(&ctnetlink_net_ops); |
3905 | nfnetlink_subsys_unregister(n: &ctnl_exp_subsys); |
3906 | nfnetlink_subsys_unregister(n: &ctnl_subsys); |
3907 | #ifdef CONFIG_NETFILTER_NETLINK_GLUE_CT |
3908 | RCU_INIT_POINTER(nfnl_ct_hook, NULL); |
3909 | #endif |
3910 | synchronize_rcu(); |
3911 | } |
3912 | |
3913 | module_init(ctnetlink_init); |
3914 | module_exit(ctnetlink_exit); |
3915 | |