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Merge tag 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost
[mirror_ubuntu-jammy-kernel.git] / net / ipv4 / inet_diag.c
1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * inet_diag.c Module for monitoring INET transport protocols sockets.
4 *
5 * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
6 */
7
8 #include <linux/kernel.h>
9 #include <linux/module.h>
10 #include <linux/types.h>
11 #include <linux/fcntl.h>
12 #include <linux/random.h>
13 #include <linux/slab.h>
14 #include <linux/cache.h>
15 #include <linux/init.h>
16 #include <linux/time.h>
17
18 #include <net/icmp.h>
19 #include <net/tcp.h>
20 #include <net/ipv6.h>
21 #include <net/inet_common.h>
22 #include <net/inet_connection_sock.h>
23 #include <net/inet_hashtables.h>
24 #include <net/inet_timewait_sock.h>
25 #include <net/inet6_hashtables.h>
26 #include <net/bpf_sk_storage.h>
27 #include <net/netlink.h>
28
29 #include <linux/inet.h>
30 #include <linux/stddef.h>
31
32 #include <linux/inet_diag.h>
33 #include <linux/sock_diag.h>
34
35 static const struct inet_diag_handler **inet_diag_table;
36
37 struct inet_diag_entry {
38 const __be32 *saddr;
39 const __be32 *daddr;
40 u16 sport;
41 u16 dport;
42 u16 family;
43 u16 userlocks;
44 u32 ifindex;
45 u32 mark;
46 #ifdef CONFIG_SOCK_CGROUP_DATA
47 u64 cgroup_id;
48 #endif
49 };
50
51 static DEFINE_MUTEX(inet_diag_table_mutex);
52
53 static const struct inet_diag_handler *inet_diag_lock_handler(int proto)
54 {
55 if (proto < 0 || proto >= IPPROTO_MAX) {
56 mutex_lock(&inet_diag_table_mutex);
57 return ERR_PTR(-ENOENT);
58 }
59
60 if (!inet_diag_table[proto])
61 sock_load_diag_module(AF_INET, proto);
62
63 mutex_lock(&inet_diag_table_mutex);
64 if (!inet_diag_table[proto])
65 return ERR_PTR(-ENOENT);
66
67 return inet_diag_table[proto];
68 }
69
70 static void inet_diag_unlock_handler(const struct inet_diag_handler *handler)
71 {
72 mutex_unlock(&inet_diag_table_mutex);
73 }
74
75 void inet_diag_msg_common_fill(struct inet_diag_msg *r, struct sock *sk)
76 {
77 r->idiag_family = sk->sk_family;
78
79 r->id.idiag_sport = htons(sk->sk_num);
80 r->id.idiag_dport = sk->sk_dport;
81 r->id.idiag_if = sk->sk_bound_dev_if;
82 sock_diag_save_cookie(sk, r->id.idiag_cookie);
83
84 #if IS_ENABLED(CONFIG_IPV6)
85 if (sk->sk_family == AF_INET6) {
86 *(struct in6_addr *)r->id.idiag_src = sk->sk_v6_rcv_saddr;
87 *(struct in6_addr *)r->id.idiag_dst = sk->sk_v6_daddr;
88 } else
89 #endif
90 {
91 memset(&r->id.idiag_src, 0, sizeof(r->id.idiag_src));
92 memset(&r->id.idiag_dst, 0, sizeof(r->id.idiag_dst));
93
94 r->id.idiag_src[0] = sk->sk_rcv_saddr;
95 r->id.idiag_dst[0] = sk->sk_daddr;
96 }
97 }
98 EXPORT_SYMBOL_GPL(inet_diag_msg_common_fill);
99
100 static size_t inet_sk_attr_size(struct sock *sk,
101 const struct inet_diag_req_v2 *req,
102 bool net_admin)
103 {
104 const struct inet_diag_handler *handler;
105 size_t aux = 0;
106
107 handler = inet_diag_table[req->sdiag_protocol];
108 if (handler && handler->idiag_get_aux_size)
109 aux = handler->idiag_get_aux_size(sk, net_admin);
110
111 return nla_total_size(sizeof(struct tcp_info))
112 + nla_total_size(sizeof(struct inet_diag_msg))
113 + inet_diag_msg_attrs_size()
114 + nla_total_size(sizeof(struct inet_diag_meminfo))
115 + nla_total_size(SK_MEMINFO_VARS * sizeof(u32))
116 + nla_total_size(TCP_CA_NAME_MAX)
117 + nla_total_size(sizeof(struct tcpvegas_info))
118 + aux
119 + 64;
120 }
121
122 int inet_diag_msg_attrs_fill(struct sock *sk, struct sk_buff *skb,
123 struct inet_diag_msg *r, int ext,
124 struct user_namespace *user_ns,
125 bool net_admin)
126 {
127 const struct inet_sock *inet = inet_sk(sk);
128 struct inet_diag_sockopt inet_sockopt;
129
130 if (nla_put_u8(skb, INET_DIAG_SHUTDOWN, sk->sk_shutdown))
131 goto errout;
132
133 /* IPv6 dual-stack sockets use inet->tos for IPv4 connections,
134 * hence this needs to be included regardless of socket family.
135 */
136 if (ext & (1 << (INET_DIAG_TOS - 1)))
137 if (nla_put_u8(skb, INET_DIAG_TOS, inet->tos) < 0)
138 goto errout;
139
140 #if IS_ENABLED(CONFIG_IPV6)
141 if (r->idiag_family == AF_INET6) {
142 if (ext & (1 << (INET_DIAG_TCLASS - 1)))
143 if (nla_put_u8(skb, INET_DIAG_TCLASS,
144 inet6_sk(sk)->tclass) < 0)
145 goto errout;
146
147 if (((1 << sk->sk_state) & (TCPF_LISTEN | TCPF_CLOSE)) &&
148 nla_put_u8(skb, INET_DIAG_SKV6ONLY, ipv6_only_sock(sk)))
149 goto errout;
150 }
151 #endif
152
153 if (net_admin && nla_put_u32(skb, INET_DIAG_MARK, sk->sk_mark))
154 goto errout;
155
156 if (ext & (1 << (INET_DIAG_CLASS_ID - 1)) ||
157 ext & (1 << (INET_DIAG_TCLASS - 1))) {
158 u32 classid = 0;
159
160 #ifdef CONFIG_SOCK_CGROUP_DATA
161 classid = sock_cgroup_classid(&sk->sk_cgrp_data);
162 #endif
163 /* Fallback to socket priority if class id isn't set.
164 * Classful qdiscs use it as direct reference to class.
165 * For cgroup2 classid is always zero.
166 */
167 if (!classid)
168 classid = sk->sk_priority;
169
170 if (nla_put_u32(skb, INET_DIAG_CLASS_ID, classid))
171 goto errout;
172 }
173
174 #ifdef CONFIG_SOCK_CGROUP_DATA
175 if (nla_put_u64_64bit(skb, INET_DIAG_CGROUP_ID,
176 cgroup_id(sock_cgroup_ptr(&sk->sk_cgrp_data)),
177 INET_DIAG_PAD))
178 goto errout;
179 #endif
180
181 r->idiag_uid = from_kuid_munged(user_ns, sock_i_uid(sk));
182 r->idiag_inode = sock_i_ino(sk);
183
184 memset(&inet_sockopt, 0, sizeof(inet_sockopt));
185 inet_sockopt.recverr = inet->recverr;
186 inet_sockopt.is_icsk = inet->is_icsk;
187 inet_sockopt.freebind = inet->freebind;
188 inet_sockopt.hdrincl = inet->hdrincl;
189 inet_sockopt.mc_loop = inet->mc_loop;
190 inet_sockopt.transparent = inet->transparent;
191 inet_sockopt.mc_all = inet->mc_all;
192 inet_sockopt.nodefrag = inet->nodefrag;
193 inet_sockopt.bind_address_no_port = inet->bind_address_no_port;
194 inet_sockopt.recverr_rfc4884 = inet->recverr_rfc4884;
195 inet_sockopt.defer_connect = inet->defer_connect;
196 if (nla_put(skb, INET_DIAG_SOCKOPT, sizeof(inet_sockopt),
197 &inet_sockopt))
198 goto errout;
199
200 return 0;
201 errout:
202 return 1;
203 }
204 EXPORT_SYMBOL_GPL(inet_diag_msg_attrs_fill);
205
206 static int inet_diag_parse_attrs(const struct nlmsghdr *nlh, int hdrlen,
207 struct nlattr **req_nlas)
208 {
209 struct nlattr *nla;
210 int remaining;
211
212 nlmsg_for_each_attr(nla, nlh, hdrlen, remaining) {
213 int type = nla_type(nla);
214
215 if (type == INET_DIAG_REQ_PROTOCOL && nla_len(nla) != sizeof(u32))
216 return -EINVAL;
217
218 if (type < __INET_DIAG_REQ_MAX)
219 req_nlas[type] = nla;
220 }
221 return 0;
222 }
223
224 static int inet_diag_get_protocol(const struct inet_diag_req_v2 *req,
225 const struct inet_diag_dump_data *data)
226 {
227 if (data->req_nlas[INET_DIAG_REQ_PROTOCOL])
228 return nla_get_u32(data->req_nlas[INET_DIAG_REQ_PROTOCOL]);
229 return req->sdiag_protocol;
230 }
231
232 #define MAX_DUMP_ALLOC_SIZE (KMALLOC_MAX_SIZE - SKB_DATA_ALIGN(sizeof(struct skb_shared_info)))
233
234 int inet_sk_diag_fill(struct sock *sk, struct inet_connection_sock *icsk,
235 struct sk_buff *skb, struct netlink_callback *cb,
236 const struct inet_diag_req_v2 *req,
237 u16 nlmsg_flags, bool net_admin)
238 {
239 const struct tcp_congestion_ops *ca_ops;
240 const struct inet_diag_handler *handler;
241 struct inet_diag_dump_data *cb_data;
242 int ext = req->idiag_ext;
243 struct inet_diag_msg *r;
244 struct nlmsghdr *nlh;
245 struct nlattr *attr;
246 void *info = NULL;
247
248 cb_data = cb->data;
249 handler = inet_diag_table[inet_diag_get_protocol(req, cb_data)];
250 BUG_ON(!handler);
251
252 nlh = nlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
253 cb->nlh->nlmsg_type, sizeof(*r), nlmsg_flags);
254 if (!nlh)
255 return -EMSGSIZE;
256
257 r = nlmsg_data(nlh);
258 BUG_ON(!sk_fullsock(sk));
259
260 inet_diag_msg_common_fill(r, sk);
261 r->idiag_state = sk->sk_state;
262 r->idiag_timer = 0;
263 r->idiag_retrans = 0;
264
265 if (inet_diag_msg_attrs_fill(sk, skb, r, ext,
266 sk_user_ns(NETLINK_CB(cb->skb).sk),
267 net_admin))
268 goto errout;
269
270 if (ext & (1 << (INET_DIAG_MEMINFO - 1))) {
271 struct inet_diag_meminfo minfo = {
272 .idiag_rmem = sk_rmem_alloc_get(sk),
273 .idiag_wmem = READ_ONCE(sk->sk_wmem_queued),
274 .idiag_fmem = sk->sk_forward_alloc,
275 .idiag_tmem = sk_wmem_alloc_get(sk),
276 };
277
278 if (nla_put(skb, INET_DIAG_MEMINFO, sizeof(minfo), &minfo) < 0)
279 goto errout;
280 }
281
282 if (ext & (1 << (INET_DIAG_SKMEMINFO - 1)))
283 if (sock_diag_put_meminfo(sk, skb, INET_DIAG_SKMEMINFO))
284 goto errout;
285
286 /*
287 * RAW sockets might have user-defined protocols assigned,
288 * so report the one supplied on socket creation.
289 */
290 if (sk->sk_type == SOCK_RAW) {
291 if (nla_put_u8(skb, INET_DIAG_PROTOCOL, sk->sk_protocol))
292 goto errout;
293 }
294
295 if (!icsk) {
296 handler->idiag_get_info(sk, r, NULL);
297 goto out;
298 }
299
300 if (icsk->icsk_pending == ICSK_TIME_RETRANS ||
301 icsk->icsk_pending == ICSK_TIME_REO_TIMEOUT ||
302 icsk->icsk_pending == ICSK_TIME_LOSS_PROBE) {
303 r->idiag_timer = 1;
304 r->idiag_retrans = icsk->icsk_retransmits;
305 r->idiag_expires =
306 jiffies_delta_to_msecs(icsk->icsk_timeout - jiffies);
307 } else if (icsk->icsk_pending == ICSK_TIME_PROBE0) {
308 r->idiag_timer = 4;
309 r->idiag_retrans = icsk->icsk_probes_out;
310 r->idiag_expires =
311 jiffies_delta_to_msecs(icsk->icsk_timeout - jiffies);
312 } else if (timer_pending(&sk->sk_timer)) {
313 r->idiag_timer = 2;
314 r->idiag_retrans = icsk->icsk_probes_out;
315 r->idiag_expires =
316 jiffies_delta_to_msecs(sk->sk_timer.expires - jiffies);
317 } else {
318 r->idiag_timer = 0;
319 r->idiag_expires = 0;
320 }
321
322 if ((ext & (1 << (INET_DIAG_INFO - 1))) && handler->idiag_info_size) {
323 attr = nla_reserve_64bit(skb, INET_DIAG_INFO,
324 handler->idiag_info_size,
325 INET_DIAG_PAD);
326 if (!attr)
327 goto errout;
328
329 info = nla_data(attr);
330 }
331
332 if (ext & (1 << (INET_DIAG_CONG - 1))) {
333 int err = 0;
334
335 rcu_read_lock();
336 ca_ops = READ_ONCE(icsk->icsk_ca_ops);
337 if (ca_ops)
338 err = nla_put_string(skb, INET_DIAG_CONG, ca_ops->name);
339 rcu_read_unlock();
340 if (err < 0)
341 goto errout;
342 }
343
344 handler->idiag_get_info(sk, r, info);
345
346 if (ext & (1 << (INET_DIAG_INFO - 1)) && handler->idiag_get_aux)
347 if (handler->idiag_get_aux(sk, net_admin, skb) < 0)
348 goto errout;
349
350 if (sk->sk_state < TCP_TIME_WAIT) {
351 union tcp_cc_info info;
352 size_t sz = 0;
353 int attr;
354
355 rcu_read_lock();
356 ca_ops = READ_ONCE(icsk->icsk_ca_ops);
357 if (ca_ops && ca_ops->get_info)
358 sz = ca_ops->get_info(sk, ext, &attr, &info);
359 rcu_read_unlock();
360 if (sz && nla_put(skb, attr, sz, &info) < 0)
361 goto errout;
362 }
363
364 /* Keep it at the end for potential retry with a larger skb,
365 * or else do best-effort fitting, which is only done for the
366 * first_nlmsg.
367 */
368 if (cb_data->bpf_stg_diag) {
369 bool first_nlmsg = ((unsigned char *)nlh == skb->data);
370 unsigned int prev_min_dump_alloc;
371 unsigned int total_nla_size = 0;
372 unsigned int msg_len;
373 int err;
374
375 msg_len = skb_tail_pointer(skb) - (unsigned char *)nlh;
376 err = bpf_sk_storage_diag_put(cb_data->bpf_stg_diag, sk, skb,
377 INET_DIAG_SK_BPF_STORAGES,
378 &total_nla_size);
379
380 if (!err)
381 goto out;
382
383 total_nla_size += msg_len;
384 prev_min_dump_alloc = cb->min_dump_alloc;
385 if (total_nla_size > prev_min_dump_alloc)
386 cb->min_dump_alloc = min_t(u32, total_nla_size,
387 MAX_DUMP_ALLOC_SIZE);
388
389 if (!first_nlmsg)
390 goto errout;
391
392 if (cb->min_dump_alloc > prev_min_dump_alloc)
393 /* Retry with pskb_expand_head() with
394 * __GFP_DIRECT_RECLAIM
395 */
396 goto errout;
397
398 WARN_ON_ONCE(total_nla_size <= prev_min_dump_alloc);
399
400 /* Send what we have for this sk
401 * and move on to the next sk in the following
402 * dump()
403 */
404 }
405
406 out:
407 nlmsg_end(skb, nlh);
408 return 0;
409
410 errout:
411 nlmsg_cancel(skb, nlh);
412 return -EMSGSIZE;
413 }
414 EXPORT_SYMBOL_GPL(inet_sk_diag_fill);
415
416 static int inet_twsk_diag_fill(struct sock *sk,
417 struct sk_buff *skb,
418 struct netlink_callback *cb,
419 u16 nlmsg_flags)
420 {
421 struct inet_timewait_sock *tw = inet_twsk(sk);
422 struct inet_diag_msg *r;
423 struct nlmsghdr *nlh;
424 long tmo;
425
426 nlh = nlmsg_put(skb, NETLINK_CB(cb->skb).portid,
427 cb->nlh->nlmsg_seq, cb->nlh->nlmsg_type,
428 sizeof(*r), nlmsg_flags);
429 if (!nlh)
430 return -EMSGSIZE;
431
432 r = nlmsg_data(nlh);
433 BUG_ON(tw->tw_state != TCP_TIME_WAIT);
434
435 inet_diag_msg_common_fill(r, sk);
436 r->idiag_retrans = 0;
437
438 r->idiag_state = tw->tw_substate;
439 r->idiag_timer = 3;
440 tmo = tw->tw_timer.expires - jiffies;
441 r->idiag_expires = jiffies_delta_to_msecs(tmo);
442 r->idiag_rqueue = 0;
443 r->idiag_wqueue = 0;
444 r->idiag_uid = 0;
445 r->idiag_inode = 0;
446
447 nlmsg_end(skb, nlh);
448 return 0;
449 }
450
451 static int inet_req_diag_fill(struct sock *sk, struct sk_buff *skb,
452 struct netlink_callback *cb,
453 u16 nlmsg_flags, bool net_admin)
454 {
455 struct request_sock *reqsk = inet_reqsk(sk);
456 struct inet_diag_msg *r;
457 struct nlmsghdr *nlh;
458 long tmo;
459
460 nlh = nlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
461 cb->nlh->nlmsg_type, sizeof(*r), nlmsg_flags);
462 if (!nlh)
463 return -EMSGSIZE;
464
465 r = nlmsg_data(nlh);
466 inet_diag_msg_common_fill(r, sk);
467 r->idiag_state = TCP_SYN_RECV;
468 r->idiag_timer = 1;
469 r->idiag_retrans = reqsk->num_retrans;
470
471 BUILD_BUG_ON(offsetof(struct inet_request_sock, ir_cookie) !=
472 offsetof(struct sock, sk_cookie));
473
474 tmo = inet_reqsk(sk)->rsk_timer.expires - jiffies;
475 r->idiag_expires = jiffies_delta_to_msecs(tmo);
476 r->idiag_rqueue = 0;
477 r->idiag_wqueue = 0;
478 r->idiag_uid = 0;
479 r->idiag_inode = 0;
480
481 if (net_admin && nla_put_u32(skb, INET_DIAG_MARK,
482 inet_rsk(reqsk)->ir_mark))
483 return -EMSGSIZE;
484
485 nlmsg_end(skb, nlh);
486 return 0;
487 }
488
489 static int sk_diag_fill(struct sock *sk, struct sk_buff *skb,
490 struct netlink_callback *cb,
491 const struct inet_diag_req_v2 *r,
492 u16 nlmsg_flags, bool net_admin)
493 {
494 if (sk->sk_state == TCP_TIME_WAIT)
495 return inet_twsk_diag_fill(sk, skb, cb, nlmsg_flags);
496
497 if (sk->sk_state == TCP_NEW_SYN_RECV)
498 return inet_req_diag_fill(sk, skb, cb, nlmsg_flags, net_admin);
499
500 return inet_sk_diag_fill(sk, inet_csk(sk), skb, cb, r, nlmsg_flags,
501 net_admin);
502 }
503
504 struct sock *inet_diag_find_one_icsk(struct net *net,
505 struct inet_hashinfo *hashinfo,
506 const struct inet_diag_req_v2 *req)
507 {
508 struct sock *sk;
509
510 rcu_read_lock();
511 if (req->sdiag_family == AF_INET)
512 sk = inet_lookup(net, hashinfo, NULL, 0, req->id.idiag_dst[0],
513 req->id.idiag_dport, req->id.idiag_src[0],
514 req->id.idiag_sport, req->id.idiag_if);
515 #if IS_ENABLED(CONFIG_IPV6)
516 else if (req->sdiag_family == AF_INET6) {
517 if (ipv6_addr_v4mapped((struct in6_addr *)req->id.idiag_dst) &&
518 ipv6_addr_v4mapped((struct in6_addr *)req->id.idiag_src))
519 sk = inet_lookup(net, hashinfo, NULL, 0, req->id.idiag_dst[3],
520 req->id.idiag_dport, req->id.idiag_src[3],
521 req->id.idiag_sport, req->id.idiag_if);
522 else
523 sk = inet6_lookup(net, hashinfo, NULL, 0,
524 (struct in6_addr *)req->id.idiag_dst,
525 req->id.idiag_dport,
526 (struct in6_addr *)req->id.idiag_src,
527 req->id.idiag_sport,
528 req->id.idiag_if);
529 }
530 #endif
531 else {
532 rcu_read_unlock();
533 return ERR_PTR(-EINVAL);
534 }
535 rcu_read_unlock();
536 if (!sk)
537 return ERR_PTR(-ENOENT);
538
539 if (sock_diag_check_cookie(sk, req->id.idiag_cookie)) {
540 sock_gen_put(sk);
541 return ERR_PTR(-ENOENT);
542 }
543
544 return sk;
545 }
546 EXPORT_SYMBOL_GPL(inet_diag_find_one_icsk);
547
548 int inet_diag_dump_one_icsk(struct inet_hashinfo *hashinfo,
549 struct netlink_callback *cb,
550 const struct inet_diag_req_v2 *req)
551 {
552 struct sk_buff *in_skb = cb->skb;
553 bool net_admin = netlink_net_capable(in_skb, CAP_NET_ADMIN);
554 struct net *net = sock_net(in_skb->sk);
555 struct sk_buff *rep;
556 struct sock *sk;
557 int err;
558
559 sk = inet_diag_find_one_icsk(net, hashinfo, req);
560 if (IS_ERR(sk))
561 return PTR_ERR(sk);
562
563 rep = nlmsg_new(inet_sk_attr_size(sk, req, net_admin), GFP_KERNEL);
564 if (!rep) {
565 err = -ENOMEM;
566 goto out;
567 }
568
569 err = sk_diag_fill(sk, rep, cb, req, 0, net_admin);
570 if (err < 0) {
571 WARN_ON(err == -EMSGSIZE);
572 nlmsg_free(rep);
573 goto out;
574 }
575 err = netlink_unicast(net->diag_nlsk, rep, NETLINK_CB(in_skb).portid,
576 MSG_DONTWAIT);
577 if (err > 0)
578 err = 0;
579
580 out:
581 if (sk)
582 sock_gen_put(sk);
583
584 return err;
585 }
586 EXPORT_SYMBOL_GPL(inet_diag_dump_one_icsk);
587
588 static int inet_diag_cmd_exact(int cmd, struct sk_buff *in_skb,
589 const struct nlmsghdr *nlh,
590 int hdrlen,
591 const struct inet_diag_req_v2 *req)
592 {
593 const struct inet_diag_handler *handler;
594 struct inet_diag_dump_data dump_data;
595 int err, protocol;
596
597 memset(&dump_data, 0, sizeof(dump_data));
598 err = inet_diag_parse_attrs(nlh, hdrlen, dump_data.req_nlas);
599 if (err)
600 return err;
601
602 protocol = inet_diag_get_protocol(req, &dump_data);
603
604 handler = inet_diag_lock_handler(protocol);
605 if (IS_ERR(handler)) {
606 err = PTR_ERR(handler);
607 } else if (cmd == SOCK_DIAG_BY_FAMILY) {
608 struct netlink_callback cb = {
609 .nlh = nlh,
610 .skb = in_skb,
611 .data = &dump_data,
612 };
613 err = handler->dump_one(&cb, req);
614 } else if (cmd == SOCK_DESTROY && handler->destroy) {
615 err = handler->destroy(in_skb, req);
616 } else {
617 err = -EOPNOTSUPP;
618 }
619 inet_diag_unlock_handler(handler);
620
621 return err;
622 }
623
624 static int bitstring_match(const __be32 *a1, const __be32 *a2, int bits)
625 {
626 int words = bits >> 5;
627
628 bits &= 0x1f;
629
630 if (words) {
631 if (memcmp(a1, a2, words << 2))
632 return 0;
633 }
634 if (bits) {
635 __be32 w1, w2;
636 __be32 mask;
637
638 w1 = a1[words];
639 w2 = a2[words];
640
641 mask = htonl((0xffffffff) << (32 - bits));
642
643 if ((w1 ^ w2) & mask)
644 return 0;
645 }
646
647 return 1;
648 }
649
650 static int inet_diag_bc_run(const struct nlattr *_bc,
651 const struct inet_diag_entry *entry)
652 {
653 const void *bc = nla_data(_bc);
654 int len = nla_len(_bc);
655
656 while (len > 0) {
657 int yes = 1;
658 const struct inet_diag_bc_op *op = bc;
659
660 switch (op->code) {
661 case INET_DIAG_BC_NOP:
662 break;
663 case INET_DIAG_BC_JMP:
664 yes = 0;
665 break;
666 case INET_DIAG_BC_S_EQ:
667 yes = entry->sport == op[1].no;
668 break;
669 case INET_DIAG_BC_S_GE:
670 yes = entry->sport >= op[1].no;
671 break;
672 case INET_DIAG_BC_S_LE:
673 yes = entry->sport <= op[1].no;
674 break;
675 case INET_DIAG_BC_D_EQ:
676 yes = entry->dport == op[1].no;
677 break;
678 case INET_DIAG_BC_D_GE:
679 yes = entry->dport >= op[1].no;
680 break;
681 case INET_DIAG_BC_D_LE:
682 yes = entry->dport <= op[1].no;
683 break;
684 case INET_DIAG_BC_AUTO:
685 yes = !(entry->userlocks & SOCK_BINDPORT_LOCK);
686 break;
687 case INET_DIAG_BC_S_COND:
688 case INET_DIAG_BC_D_COND: {
689 const struct inet_diag_hostcond *cond;
690 const __be32 *addr;
691
692 cond = (const struct inet_diag_hostcond *)(op + 1);
693 if (cond->port != -1 &&
694 cond->port != (op->code == INET_DIAG_BC_S_COND ?
695 entry->sport : entry->dport)) {
696 yes = 0;
697 break;
698 }
699
700 if (op->code == INET_DIAG_BC_S_COND)
701 addr = entry->saddr;
702 else
703 addr = entry->daddr;
704
705 if (cond->family != AF_UNSPEC &&
706 cond->family != entry->family) {
707 if (entry->family == AF_INET6 &&
708 cond->family == AF_INET) {
709 if (addr[0] == 0 && addr[1] == 0 &&
710 addr[2] == htonl(0xffff) &&
711 bitstring_match(addr + 3,
712 cond->addr,
713 cond->prefix_len))
714 break;
715 }
716 yes = 0;
717 break;
718 }
719
720 if (cond->prefix_len == 0)
721 break;
722 if (bitstring_match(addr, cond->addr,
723 cond->prefix_len))
724 break;
725 yes = 0;
726 break;
727 }
728 case INET_DIAG_BC_DEV_COND: {
729 u32 ifindex;
730
731 ifindex = *((const u32 *)(op + 1));
732 if (ifindex != entry->ifindex)
733 yes = 0;
734 break;
735 }
736 case INET_DIAG_BC_MARK_COND: {
737 struct inet_diag_markcond *cond;
738
739 cond = (struct inet_diag_markcond *)(op + 1);
740 if ((entry->mark & cond->mask) != cond->mark)
741 yes = 0;
742 break;
743 }
744 #ifdef CONFIG_SOCK_CGROUP_DATA
745 case INET_DIAG_BC_CGROUP_COND: {
746 u64 cgroup_id;
747
748 cgroup_id = get_unaligned((const u64 *)(op + 1));
749 if (cgroup_id != entry->cgroup_id)
750 yes = 0;
751 break;
752 }
753 #endif
754 }
755
756 if (yes) {
757 len -= op->yes;
758 bc += op->yes;
759 } else {
760 len -= op->no;
761 bc += op->no;
762 }
763 }
764 return len == 0;
765 }
766
767 /* This helper is available for all sockets (ESTABLISH, TIMEWAIT, SYN_RECV)
768 */
769 static void entry_fill_addrs(struct inet_diag_entry *entry,
770 const struct sock *sk)
771 {
772 #if IS_ENABLED(CONFIG_IPV6)
773 if (sk->sk_family == AF_INET6) {
774 entry->saddr = sk->sk_v6_rcv_saddr.s6_addr32;
775 entry->daddr = sk->sk_v6_daddr.s6_addr32;
776 } else
777 #endif
778 {
779 entry->saddr = &sk->sk_rcv_saddr;
780 entry->daddr = &sk->sk_daddr;
781 }
782 }
783
784 int inet_diag_bc_sk(const struct nlattr *bc, struct sock *sk)
785 {
786 struct inet_sock *inet = inet_sk(sk);
787 struct inet_diag_entry entry;
788
789 if (!bc)
790 return 1;
791
792 entry.family = sk->sk_family;
793 entry_fill_addrs(&entry, sk);
794 entry.sport = inet->inet_num;
795 entry.dport = ntohs(inet->inet_dport);
796 entry.ifindex = sk->sk_bound_dev_if;
797 entry.userlocks = sk_fullsock(sk) ? sk->sk_userlocks : 0;
798 if (sk_fullsock(sk))
799 entry.mark = sk->sk_mark;
800 else if (sk->sk_state == TCP_NEW_SYN_RECV)
801 entry.mark = inet_rsk(inet_reqsk(sk))->ir_mark;
802 else
803 entry.mark = 0;
804 #ifdef CONFIG_SOCK_CGROUP_DATA
805 entry.cgroup_id = sk_fullsock(sk) ?
806 cgroup_id(sock_cgroup_ptr(&sk->sk_cgrp_data)) : 0;
807 #endif
808
809 return inet_diag_bc_run(bc, &entry);
810 }
811 EXPORT_SYMBOL_GPL(inet_diag_bc_sk);
812
813 static int valid_cc(const void *bc, int len, int cc)
814 {
815 while (len >= 0) {
816 const struct inet_diag_bc_op *op = bc;
817
818 if (cc > len)
819 return 0;
820 if (cc == len)
821 return 1;
822 if (op->yes < 4 || op->yes & 3)
823 return 0;
824 len -= op->yes;
825 bc += op->yes;
826 }
827 return 0;
828 }
829
830 /* data is u32 ifindex */
831 static bool valid_devcond(const struct inet_diag_bc_op *op, int len,
832 int *min_len)
833 {
834 /* Check ifindex space. */
835 *min_len += sizeof(u32);
836 if (len < *min_len)
837 return false;
838
839 return true;
840 }
841 /* Validate an inet_diag_hostcond. */
842 static bool valid_hostcond(const struct inet_diag_bc_op *op, int len,
843 int *min_len)
844 {
845 struct inet_diag_hostcond *cond;
846 int addr_len;
847
848 /* Check hostcond space. */
849 *min_len += sizeof(struct inet_diag_hostcond);
850 if (len < *min_len)
851 return false;
852 cond = (struct inet_diag_hostcond *)(op + 1);
853
854 /* Check address family and address length. */
855 switch (cond->family) {
856 case AF_UNSPEC:
857 addr_len = 0;
858 break;
859 case AF_INET:
860 addr_len = sizeof(struct in_addr);
861 break;
862 case AF_INET6:
863 addr_len = sizeof(struct in6_addr);
864 break;
865 default:
866 return false;
867 }
868 *min_len += addr_len;
869 if (len < *min_len)
870 return false;
871
872 /* Check prefix length (in bits) vs address length (in bytes). */
873 if (cond->prefix_len > 8 * addr_len)
874 return false;
875
876 return true;
877 }
878
879 /* Validate a port comparison operator. */
880 static bool valid_port_comparison(const struct inet_diag_bc_op *op,
881 int len, int *min_len)
882 {
883 /* Port comparisons put the port in a follow-on inet_diag_bc_op. */
884 *min_len += sizeof(struct inet_diag_bc_op);
885 if (len < *min_len)
886 return false;
887 return true;
888 }
889
890 static bool valid_markcond(const struct inet_diag_bc_op *op, int len,
891 int *min_len)
892 {
893 *min_len += sizeof(struct inet_diag_markcond);
894 return len >= *min_len;
895 }
896
897 #ifdef CONFIG_SOCK_CGROUP_DATA
898 static bool valid_cgroupcond(const struct inet_diag_bc_op *op, int len,
899 int *min_len)
900 {
901 *min_len += sizeof(u64);
902 return len >= *min_len;
903 }
904 #endif
905
906 static int inet_diag_bc_audit(const struct nlattr *attr,
907 const struct sk_buff *skb)
908 {
909 bool net_admin = netlink_net_capable(skb, CAP_NET_ADMIN);
910 const void *bytecode, *bc;
911 int bytecode_len, len;
912
913 if (!attr || nla_len(attr) < sizeof(struct inet_diag_bc_op))
914 return -EINVAL;
915
916 bytecode = bc = nla_data(attr);
917 len = bytecode_len = nla_len(attr);
918
919 while (len > 0) {
920 int min_len = sizeof(struct inet_diag_bc_op);
921 const struct inet_diag_bc_op *op = bc;
922
923 switch (op->code) {
924 case INET_DIAG_BC_S_COND:
925 case INET_DIAG_BC_D_COND:
926 if (!valid_hostcond(bc, len, &min_len))
927 return -EINVAL;
928 break;
929 case INET_DIAG_BC_DEV_COND:
930 if (!valid_devcond(bc, len, &min_len))
931 return -EINVAL;
932 break;
933 case INET_DIAG_BC_S_EQ:
934 case INET_DIAG_BC_S_GE:
935 case INET_DIAG_BC_S_LE:
936 case INET_DIAG_BC_D_EQ:
937 case INET_DIAG_BC_D_GE:
938 case INET_DIAG_BC_D_LE:
939 if (!valid_port_comparison(bc, len, &min_len))
940 return -EINVAL;
941 break;
942 case INET_DIAG_BC_MARK_COND:
943 if (!net_admin)
944 return -EPERM;
945 if (!valid_markcond(bc, len, &min_len))
946 return -EINVAL;
947 break;
948 #ifdef CONFIG_SOCK_CGROUP_DATA
949 case INET_DIAG_BC_CGROUP_COND:
950 if (!valid_cgroupcond(bc, len, &min_len))
951 return -EINVAL;
952 break;
953 #endif
954 case INET_DIAG_BC_AUTO:
955 case INET_DIAG_BC_JMP:
956 case INET_DIAG_BC_NOP:
957 break;
958 default:
959 return -EINVAL;
960 }
961
962 if (op->code != INET_DIAG_BC_NOP) {
963 if (op->no < min_len || op->no > len + 4 || op->no & 3)
964 return -EINVAL;
965 if (op->no < len &&
966 !valid_cc(bytecode, bytecode_len, len - op->no))
967 return -EINVAL;
968 }
969
970 if (op->yes < min_len || op->yes > len + 4 || op->yes & 3)
971 return -EINVAL;
972 bc += op->yes;
973 len -= op->yes;
974 }
975 return len == 0 ? 0 : -EINVAL;
976 }
977
978 static void twsk_build_assert(void)
979 {
980 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_family) !=
981 offsetof(struct sock, sk_family));
982
983 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_num) !=
984 offsetof(struct inet_sock, inet_num));
985
986 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_dport) !=
987 offsetof(struct inet_sock, inet_dport));
988
989 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_rcv_saddr) !=
990 offsetof(struct inet_sock, inet_rcv_saddr));
991
992 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_daddr) !=
993 offsetof(struct inet_sock, inet_daddr));
994
995 #if IS_ENABLED(CONFIG_IPV6)
996 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_v6_rcv_saddr) !=
997 offsetof(struct sock, sk_v6_rcv_saddr));
998
999 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_v6_daddr) !=
1000 offsetof(struct sock, sk_v6_daddr));
1001 #endif
1002 }
1003
1004 void inet_diag_dump_icsk(struct inet_hashinfo *hashinfo, struct sk_buff *skb,
1005 struct netlink_callback *cb,
1006 const struct inet_diag_req_v2 *r)
1007 {
1008 bool net_admin = netlink_net_capable(cb->skb, CAP_NET_ADMIN);
1009 struct inet_diag_dump_data *cb_data = cb->data;
1010 struct net *net = sock_net(skb->sk);
1011 u32 idiag_states = r->idiag_states;
1012 int i, num, s_i, s_num;
1013 struct nlattr *bc;
1014 struct sock *sk;
1015
1016 bc = cb_data->inet_diag_nla_bc;
1017 if (idiag_states & TCPF_SYN_RECV)
1018 idiag_states |= TCPF_NEW_SYN_RECV;
1019 s_i = cb->args[1];
1020 s_num = num = cb->args[2];
1021
1022 if (cb->args[0] == 0) {
1023 if (!(idiag_states & TCPF_LISTEN) || r->id.idiag_dport)
1024 goto skip_listen_ht;
1025
1026 for (i = s_i; i < INET_LHTABLE_SIZE; i++) {
1027 struct inet_listen_hashbucket *ilb;
1028 struct hlist_nulls_node *node;
1029
1030 num = 0;
1031 ilb = &hashinfo->listening_hash[i];
1032 spin_lock(&ilb->lock);
1033 sk_nulls_for_each(sk, node, &ilb->nulls_head) {
1034 struct inet_sock *inet = inet_sk(sk);
1035
1036 if (!net_eq(sock_net(sk), net))
1037 continue;
1038
1039 if (num < s_num) {
1040 num++;
1041 continue;
1042 }
1043
1044 if (r->sdiag_family != AF_UNSPEC &&
1045 sk->sk_family != r->sdiag_family)
1046 goto next_listen;
1047
1048 if (r->id.idiag_sport != inet->inet_sport &&
1049 r->id.idiag_sport)
1050 goto next_listen;
1051
1052 if (!inet_diag_bc_sk(bc, sk))
1053 goto next_listen;
1054
1055 if (inet_sk_diag_fill(sk, inet_csk(sk), skb,
1056 cb, r, NLM_F_MULTI,
1057 net_admin) < 0) {
1058 spin_unlock(&ilb->lock);
1059 goto done;
1060 }
1061
1062 next_listen:
1063 ++num;
1064 }
1065 spin_unlock(&ilb->lock);
1066
1067 s_num = 0;
1068 }
1069 skip_listen_ht:
1070 cb->args[0] = 1;
1071 s_i = num = s_num = 0;
1072 }
1073
1074 if (!(idiag_states & ~TCPF_LISTEN))
1075 goto out;
1076
1077 #define SKARR_SZ 16
1078 for (i = s_i; i <= hashinfo->ehash_mask; i++) {
1079 struct inet_ehash_bucket *head = &hashinfo->ehash[i];
1080 spinlock_t *lock = inet_ehash_lockp(hashinfo, i);
1081 struct hlist_nulls_node *node;
1082 struct sock *sk_arr[SKARR_SZ];
1083 int num_arr[SKARR_SZ];
1084 int idx, accum, res;
1085
1086 if (hlist_nulls_empty(&head->chain))
1087 continue;
1088
1089 if (i > s_i)
1090 s_num = 0;
1091
1092 next_chunk:
1093 num = 0;
1094 accum = 0;
1095 spin_lock_bh(lock);
1096 sk_nulls_for_each(sk, node, &head->chain) {
1097 int state;
1098
1099 if (!net_eq(sock_net(sk), net))
1100 continue;
1101 if (num < s_num)
1102 goto next_normal;
1103 state = (sk->sk_state == TCP_TIME_WAIT) ?
1104 inet_twsk(sk)->tw_substate : sk->sk_state;
1105 if (!(idiag_states & (1 << state)))
1106 goto next_normal;
1107 if (r->sdiag_family != AF_UNSPEC &&
1108 sk->sk_family != r->sdiag_family)
1109 goto next_normal;
1110 if (r->id.idiag_sport != htons(sk->sk_num) &&
1111 r->id.idiag_sport)
1112 goto next_normal;
1113 if (r->id.idiag_dport != sk->sk_dport &&
1114 r->id.idiag_dport)
1115 goto next_normal;
1116 twsk_build_assert();
1117
1118 if (!inet_diag_bc_sk(bc, sk))
1119 goto next_normal;
1120
1121 if (!refcount_inc_not_zero(&sk->sk_refcnt))
1122 goto next_normal;
1123
1124 num_arr[accum] = num;
1125 sk_arr[accum] = sk;
1126 if (++accum == SKARR_SZ)
1127 break;
1128 next_normal:
1129 ++num;
1130 }
1131 spin_unlock_bh(lock);
1132 res = 0;
1133 for (idx = 0; idx < accum; idx++) {
1134 if (res >= 0) {
1135 res = sk_diag_fill(sk_arr[idx], skb, cb, r,
1136 NLM_F_MULTI, net_admin);
1137 if (res < 0)
1138 num = num_arr[idx];
1139 }
1140 sock_gen_put(sk_arr[idx]);
1141 }
1142 if (res < 0)
1143 break;
1144 cond_resched();
1145 if (accum == SKARR_SZ) {
1146 s_num = num + 1;
1147 goto next_chunk;
1148 }
1149 }
1150
1151 done:
1152 cb->args[1] = i;
1153 cb->args[2] = num;
1154 out:
1155 ;
1156 }
1157 EXPORT_SYMBOL_GPL(inet_diag_dump_icsk);
1158
1159 static int __inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb,
1160 const struct inet_diag_req_v2 *r)
1161 {
1162 struct inet_diag_dump_data *cb_data = cb->data;
1163 const struct inet_diag_handler *handler;
1164 u32 prev_min_dump_alloc;
1165 int protocol, err = 0;
1166
1167 protocol = inet_diag_get_protocol(r, cb_data);
1168
1169 again:
1170 prev_min_dump_alloc = cb->min_dump_alloc;
1171 handler = inet_diag_lock_handler(protocol);
1172 if (!IS_ERR(handler))
1173 handler->dump(skb, cb, r);
1174 else
1175 err = PTR_ERR(handler);
1176 inet_diag_unlock_handler(handler);
1177
1178 /* The skb is not large enough to fit one sk info and
1179 * inet_sk_diag_fill() has requested for a larger skb.
1180 */
1181 if (!skb->len && cb->min_dump_alloc > prev_min_dump_alloc) {
1182 err = pskb_expand_head(skb, 0, cb->min_dump_alloc, GFP_KERNEL);
1183 if (!err)
1184 goto again;
1185 }
1186
1187 return err ? : skb->len;
1188 }
1189
1190 static int inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb)
1191 {
1192 return __inet_diag_dump(skb, cb, nlmsg_data(cb->nlh));
1193 }
1194
1195 static int __inet_diag_dump_start(struct netlink_callback *cb, int hdrlen)
1196 {
1197 const struct nlmsghdr *nlh = cb->nlh;
1198 struct inet_diag_dump_data *cb_data;
1199 struct sk_buff *skb = cb->skb;
1200 struct nlattr *nla;
1201 int err;
1202
1203 cb_data = kzalloc(sizeof(*cb_data), GFP_KERNEL);
1204 if (!cb_data)
1205 return -ENOMEM;
1206
1207 err = inet_diag_parse_attrs(nlh, hdrlen, cb_data->req_nlas);
1208 if (err) {
1209 kfree(cb_data);
1210 return err;
1211 }
1212 nla = cb_data->inet_diag_nla_bc;
1213 if (nla) {
1214 err = inet_diag_bc_audit(nla, skb);
1215 if (err) {
1216 kfree(cb_data);
1217 return err;
1218 }
1219 }
1220
1221 nla = cb_data->inet_diag_nla_bpf_stgs;
1222 if (nla) {
1223 struct bpf_sk_storage_diag *bpf_stg_diag;
1224
1225 bpf_stg_diag = bpf_sk_storage_diag_alloc(nla);
1226 if (IS_ERR(bpf_stg_diag)) {
1227 kfree(cb_data);
1228 return PTR_ERR(bpf_stg_diag);
1229 }
1230 cb_data->bpf_stg_diag = bpf_stg_diag;
1231 }
1232
1233 cb->data = cb_data;
1234 return 0;
1235 }
1236
1237 static int inet_diag_dump_start(struct netlink_callback *cb)
1238 {
1239 return __inet_diag_dump_start(cb, sizeof(struct inet_diag_req_v2));
1240 }
1241
1242 static int inet_diag_dump_start_compat(struct netlink_callback *cb)
1243 {
1244 return __inet_diag_dump_start(cb, sizeof(struct inet_diag_req));
1245 }
1246
1247 static int inet_diag_dump_done(struct netlink_callback *cb)
1248 {
1249 struct inet_diag_dump_data *cb_data = cb->data;
1250
1251 bpf_sk_storage_diag_free(cb_data->bpf_stg_diag);
1252 kfree(cb->data);
1253
1254 return 0;
1255 }
1256
1257 static int inet_diag_type2proto(int type)
1258 {
1259 switch (type) {
1260 case TCPDIAG_GETSOCK:
1261 return IPPROTO_TCP;
1262 case DCCPDIAG_GETSOCK:
1263 return IPPROTO_DCCP;
1264 default:
1265 return 0;
1266 }
1267 }
1268
1269 static int inet_diag_dump_compat(struct sk_buff *skb,
1270 struct netlink_callback *cb)
1271 {
1272 struct inet_diag_req *rc = nlmsg_data(cb->nlh);
1273 struct inet_diag_req_v2 req;
1274
1275 req.sdiag_family = AF_UNSPEC; /* compatibility */
1276 req.sdiag_protocol = inet_diag_type2proto(cb->nlh->nlmsg_type);
1277 req.idiag_ext = rc->idiag_ext;
1278 req.idiag_states = rc->idiag_states;
1279 req.id = rc->id;
1280
1281 return __inet_diag_dump(skb, cb, &req);
1282 }
1283
1284 static int inet_diag_get_exact_compat(struct sk_buff *in_skb,
1285 const struct nlmsghdr *nlh)
1286 {
1287 struct inet_diag_req *rc = nlmsg_data(nlh);
1288 struct inet_diag_req_v2 req;
1289
1290 req.sdiag_family = rc->idiag_family;
1291 req.sdiag_protocol = inet_diag_type2proto(nlh->nlmsg_type);
1292 req.idiag_ext = rc->idiag_ext;
1293 req.idiag_states = rc->idiag_states;
1294 req.id = rc->id;
1295
1296 return inet_diag_cmd_exact(SOCK_DIAG_BY_FAMILY, in_skb, nlh,
1297 sizeof(struct inet_diag_req), &req);
1298 }
1299
1300 static int inet_diag_rcv_msg_compat(struct sk_buff *skb, struct nlmsghdr *nlh)
1301 {
1302 int hdrlen = sizeof(struct inet_diag_req);
1303 struct net *net = sock_net(skb->sk);
1304
1305 if (nlh->nlmsg_type >= INET_DIAG_GETSOCK_MAX ||
1306 nlmsg_len(nlh) < hdrlen)
1307 return -EINVAL;
1308
1309 if (nlh->nlmsg_flags & NLM_F_DUMP) {
1310 struct netlink_dump_control c = {
1311 .start = inet_diag_dump_start_compat,
1312 .done = inet_diag_dump_done,
1313 .dump = inet_diag_dump_compat,
1314 };
1315 return netlink_dump_start(net->diag_nlsk, skb, nlh, &c);
1316 }
1317
1318 return inet_diag_get_exact_compat(skb, nlh);
1319 }
1320
1321 static int inet_diag_handler_cmd(struct sk_buff *skb, struct nlmsghdr *h)
1322 {
1323 int hdrlen = sizeof(struct inet_diag_req_v2);
1324 struct net *net = sock_net(skb->sk);
1325
1326 if (nlmsg_len(h) < hdrlen)
1327 return -EINVAL;
1328
1329 if (h->nlmsg_type == SOCK_DIAG_BY_FAMILY &&
1330 h->nlmsg_flags & NLM_F_DUMP) {
1331 struct netlink_dump_control c = {
1332 .start = inet_diag_dump_start,
1333 .done = inet_diag_dump_done,
1334 .dump = inet_diag_dump,
1335 };
1336 return netlink_dump_start(net->diag_nlsk, skb, h, &c);
1337 }
1338
1339 return inet_diag_cmd_exact(h->nlmsg_type, skb, h, hdrlen,
1340 nlmsg_data(h));
1341 }
1342
1343 static
1344 int inet_diag_handler_get_info(struct sk_buff *skb, struct sock *sk)
1345 {
1346 const struct inet_diag_handler *handler;
1347 struct nlmsghdr *nlh;
1348 struct nlattr *attr;
1349 struct inet_diag_msg *r;
1350 void *info = NULL;
1351 int err = 0;
1352
1353 nlh = nlmsg_put(skb, 0, 0, SOCK_DIAG_BY_FAMILY, sizeof(*r), 0);
1354 if (!nlh)
1355 return -ENOMEM;
1356
1357 r = nlmsg_data(nlh);
1358 memset(r, 0, sizeof(*r));
1359 inet_diag_msg_common_fill(r, sk);
1360 if (sk->sk_type == SOCK_DGRAM || sk->sk_type == SOCK_STREAM)
1361 r->id.idiag_sport = inet_sk(sk)->inet_sport;
1362 r->idiag_state = sk->sk_state;
1363
1364 if ((err = nla_put_u8(skb, INET_DIAG_PROTOCOL, sk->sk_protocol))) {
1365 nlmsg_cancel(skb, nlh);
1366 return err;
1367 }
1368
1369 handler = inet_diag_lock_handler(sk->sk_protocol);
1370 if (IS_ERR(handler)) {
1371 inet_diag_unlock_handler(handler);
1372 nlmsg_cancel(skb, nlh);
1373 return PTR_ERR(handler);
1374 }
1375
1376 attr = handler->idiag_info_size
1377 ? nla_reserve_64bit(skb, INET_DIAG_INFO,
1378 handler->idiag_info_size,
1379 INET_DIAG_PAD)
1380 : NULL;
1381 if (attr)
1382 info = nla_data(attr);
1383
1384 handler->idiag_get_info(sk, r, info);
1385 inet_diag_unlock_handler(handler);
1386
1387 nlmsg_end(skb, nlh);
1388 return 0;
1389 }
1390
1391 static const struct sock_diag_handler inet_diag_handler = {
1392 .family = AF_INET,
1393 .dump = inet_diag_handler_cmd,
1394 .get_info = inet_diag_handler_get_info,
1395 .destroy = inet_diag_handler_cmd,
1396 };
1397
1398 static const struct sock_diag_handler inet6_diag_handler = {
1399 .family = AF_INET6,
1400 .dump = inet_diag_handler_cmd,
1401 .get_info = inet_diag_handler_get_info,
1402 .destroy = inet_diag_handler_cmd,
1403 };
1404
1405 int inet_diag_register(const struct inet_diag_handler *h)
1406 {
1407 const __u16 type = h->idiag_type;
1408 int err = -EINVAL;
1409
1410 if (type >= IPPROTO_MAX)
1411 goto out;
1412
1413 mutex_lock(&inet_diag_table_mutex);
1414 err = -EEXIST;
1415 if (!inet_diag_table[type]) {
1416 inet_diag_table[type] = h;
1417 err = 0;
1418 }
1419 mutex_unlock(&inet_diag_table_mutex);
1420 out:
1421 return err;
1422 }
1423 EXPORT_SYMBOL_GPL(inet_diag_register);
1424
1425 void inet_diag_unregister(const struct inet_diag_handler *h)
1426 {
1427 const __u16 type = h->idiag_type;
1428
1429 if (type >= IPPROTO_MAX)
1430 return;
1431
1432 mutex_lock(&inet_diag_table_mutex);
1433 inet_diag_table[type] = NULL;
1434 mutex_unlock(&inet_diag_table_mutex);
1435 }
1436 EXPORT_SYMBOL_GPL(inet_diag_unregister);
1437
1438 static int __init inet_diag_init(void)
1439 {
1440 const int inet_diag_table_size = (IPPROTO_MAX *
1441 sizeof(struct inet_diag_handler *));
1442 int err = -ENOMEM;
1443
1444 inet_diag_table = kzalloc(inet_diag_table_size, GFP_KERNEL);
1445 if (!inet_diag_table)
1446 goto out;
1447
1448 err = sock_diag_register(&inet_diag_handler);
1449 if (err)
1450 goto out_free_nl;
1451
1452 err = sock_diag_register(&inet6_diag_handler);
1453 if (err)
1454 goto out_free_inet;
1455
1456 sock_diag_register_inet_compat(inet_diag_rcv_msg_compat);
1457 out:
1458 return err;
1459
1460 out_free_inet:
1461 sock_diag_unregister(&inet_diag_handler);
1462 out_free_nl:
1463 kfree(inet_diag_table);
1464 goto out;
1465 }
1466
1467 static void __exit inet_diag_exit(void)
1468 {
1469 sock_diag_unregister(&inet6_diag_handler);
1470 sock_diag_unregister(&inet_diag_handler);
1471 sock_diag_unregister_inet_compat(inet_diag_rcv_msg_compat);
1472 kfree(inet_diag_table);
1473 }
1474
1475 module_init(inet_diag_init);
1476 module_exit(inet_diag_exit);
1477 MODULE_LICENSE("GPL");
1478 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 2 /* AF_INET */);
1479 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 10 /* AF_INET6 */);
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