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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
35static const struct inet_diag_handler **inet_diag_table;
36
37struct 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
51static DEFINE_MUTEX(inet_diag_table_mutex);
52
53static 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
70static void inet_diag_unlock_handler(const struct inet_diag_handler *handler)
71{
72 mutex_unlock(&inet_diag_table_mutex);
73}
74
75void 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}
98EXPORT_SYMBOL_GPL(inet_diag_msg_common_fill);
99
100static 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
122int 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;
201errout:
202 return 1;
203}
204EXPORT_SYMBOL_GPL(inet_diag_msg_attrs_fill);
205
206static 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
224static 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
234int 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
406out:
407 nlmsg_end(skb, nlh);
408 return 0;
409
410errout:
411 nlmsg_cancel(skb, nlh);
412 return -EMSGSIZE;
413}
414EXPORT_SYMBOL_GPL(inet_sk_diag_fill);
415
416static int inet_twsk_diag_fill(struct sock *sk,
417 struct sk_buff *skb,
418 struct netlink_callback *cb,
419 u16 nlmsg_flags, bool net_admin)
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 if (net_admin && nla_put_u32(skb, INET_DIAG_MARK,
448 tw->tw_mark)) {
449 nlmsg_cancel(skb, nlh);
450 return -EMSGSIZE;
451 }
452
453 nlmsg_end(skb, nlh);
454 return 0;
455}
456
457static int inet_req_diag_fill(struct sock *sk, struct sk_buff *skb,
458 struct netlink_callback *cb,
459 u16 nlmsg_flags, bool net_admin)
460{
461 struct request_sock *reqsk = inet_reqsk(sk);
462 struct inet_diag_msg *r;
463 struct nlmsghdr *nlh;
464 long tmo;
465
466 nlh = nlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
467 cb->nlh->nlmsg_type, sizeof(*r), nlmsg_flags);
468 if (!nlh)
469 return -EMSGSIZE;
470
471 r = nlmsg_data(nlh);
472 inet_diag_msg_common_fill(r, sk);
473 r->idiag_state = TCP_SYN_RECV;
474 r->idiag_timer = 1;
475 r->idiag_retrans = reqsk->num_retrans;
476
477 BUILD_BUG_ON(offsetof(struct inet_request_sock, ir_cookie) !=
478 offsetof(struct sock, sk_cookie));
479
480 tmo = inet_reqsk(sk)->rsk_timer.expires - jiffies;
481 r->idiag_expires = jiffies_delta_to_msecs(tmo);
482 r->idiag_rqueue = 0;
483 r->idiag_wqueue = 0;
484 r->idiag_uid = 0;
485 r->idiag_inode = 0;
486
487 if (net_admin && nla_put_u32(skb, INET_DIAG_MARK,
488 inet_rsk(reqsk)->ir_mark)) {
489 nlmsg_cancel(skb, nlh);
490 return -EMSGSIZE;
491 }
492
493 nlmsg_end(skb, nlh);
494 return 0;
495}
496
497static int sk_diag_fill(struct sock *sk, struct sk_buff *skb,
498 struct netlink_callback *cb,
499 const struct inet_diag_req_v2 *r,
500 u16 nlmsg_flags, bool net_admin)
501{
502 if (sk->sk_state == TCP_TIME_WAIT)
503 return inet_twsk_diag_fill(sk, skb, cb, nlmsg_flags, net_admin);
504
505 if (sk->sk_state == TCP_NEW_SYN_RECV)
506 return inet_req_diag_fill(sk, skb, cb, nlmsg_flags, net_admin);
507
508 return inet_sk_diag_fill(sk, inet_csk(sk), skb, cb, r, nlmsg_flags,
509 net_admin);
510}
511
512struct sock *inet_diag_find_one_icsk(struct net *net,
513 struct inet_hashinfo *hashinfo,
514 const struct inet_diag_req_v2 *req)
515{
516 struct sock *sk;
517
518 rcu_read_lock();
519 if (req->sdiag_family == AF_INET)
520 sk = inet_lookup(net, hashinfo, NULL, 0, req->id.idiag_dst[0],
521 req->id.idiag_dport, req->id.idiag_src[0],
522 req->id.idiag_sport, req->id.idiag_if);
523#if IS_ENABLED(CONFIG_IPV6)
524 else if (req->sdiag_family == AF_INET6) {
525 if (ipv6_addr_v4mapped((struct in6_addr *)req->id.idiag_dst) &&
526 ipv6_addr_v4mapped((struct in6_addr *)req->id.idiag_src))
527 sk = inet_lookup(net, hashinfo, NULL, 0, req->id.idiag_dst[3],
528 req->id.idiag_dport, req->id.idiag_src[3],
529 req->id.idiag_sport, req->id.idiag_if);
530 else
531 sk = inet6_lookup(net, hashinfo, NULL, 0,
532 (struct in6_addr *)req->id.idiag_dst,
533 req->id.idiag_dport,
534 (struct in6_addr *)req->id.idiag_src,
535 req->id.idiag_sport,
536 req->id.idiag_if);
537 }
538#endif
539 else {
540 rcu_read_unlock();
541 return ERR_PTR(-EINVAL);
542 }
543 rcu_read_unlock();
544 if (!sk)
545 return ERR_PTR(-ENOENT);
546
547 if (sock_diag_check_cookie(sk, req->id.idiag_cookie)) {
548 sock_gen_put(sk);
549 return ERR_PTR(-ENOENT);
550 }
551
552 return sk;
553}
554EXPORT_SYMBOL_GPL(inet_diag_find_one_icsk);
555
556int inet_diag_dump_one_icsk(struct inet_hashinfo *hashinfo,
557 struct netlink_callback *cb,
558 const struct inet_diag_req_v2 *req)
559{
560 struct sk_buff *in_skb = cb->skb;
561 bool net_admin = netlink_net_capable(in_skb, CAP_NET_ADMIN);
562 struct net *net = sock_net(in_skb->sk);
563 struct sk_buff *rep;
564 struct sock *sk;
565 int err;
566
567 sk = inet_diag_find_one_icsk(net, hashinfo, req);
568 if (IS_ERR(sk))
569 return PTR_ERR(sk);
570
571 rep = nlmsg_new(inet_sk_attr_size(sk, req, net_admin), GFP_KERNEL);
572 if (!rep) {
573 err = -ENOMEM;
574 goto out;
575 }
576
577 err = sk_diag_fill(sk, rep, cb, req, 0, net_admin);
578 if (err < 0) {
579 WARN_ON(err == -EMSGSIZE);
580 nlmsg_free(rep);
581 goto out;
582 }
583 err = nlmsg_unicast(net->diag_nlsk, rep, NETLINK_CB(in_skb).portid);
584
585out:
586 if (sk)
587 sock_gen_put(sk);
588
589 return err;
590}
591EXPORT_SYMBOL_GPL(inet_diag_dump_one_icsk);
592
593static int inet_diag_cmd_exact(int cmd, struct sk_buff *in_skb,
594 const struct nlmsghdr *nlh,
595 int hdrlen,
596 const struct inet_diag_req_v2 *req)
597{
598 const struct inet_diag_handler *handler;
599 struct inet_diag_dump_data dump_data;
600 int err, protocol;
601
602 memset(&dump_data, 0, sizeof(dump_data));
603 err = inet_diag_parse_attrs(nlh, hdrlen, dump_data.req_nlas);
604 if (err)
605 return err;
606
607 protocol = inet_diag_get_protocol(req, &dump_data);
608
609 handler = inet_diag_lock_handler(protocol);
610 if (IS_ERR(handler)) {
611 err = PTR_ERR(handler);
612 } else if (cmd == SOCK_DIAG_BY_FAMILY) {
613 struct netlink_callback cb = {
614 .nlh = nlh,
615 .skb = in_skb,
616 .data = &dump_data,
617 };
618 err = handler->dump_one(&cb, req);
619 } else if (cmd == SOCK_DESTROY && handler->destroy) {
620 err = handler->destroy(in_skb, req);
621 } else {
622 err = -EOPNOTSUPP;
623 }
624 inet_diag_unlock_handler(handler);
625
626 return err;
627}
628
629static int bitstring_match(const __be32 *a1, const __be32 *a2, int bits)
630{
631 int words = bits >> 5;
632
633 bits &= 0x1f;
634
635 if (words) {
636 if (memcmp(a1, a2, words << 2))
637 return 0;
638 }
639 if (bits) {
640 __be32 w1, w2;
641 __be32 mask;
642
643 w1 = a1[words];
644 w2 = a2[words];
645
646 mask = htonl((0xffffffff) << (32 - bits));
647
648 if ((w1 ^ w2) & mask)
649 return 0;
650 }
651
652 return 1;
653}
654
655static int inet_diag_bc_run(const struct nlattr *_bc,
656 const struct inet_diag_entry *entry)
657{
658 const void *bc = nla_data(_bc);
659 int len = nla_len(_bc);
660
661 while (len > 0) {
662 int yes = 1;
663 const struct inet_diag_bc_op *op = bc;
664
665 switch (op->code) {
666 case INET_DIAG_BC_NOP:
667 break;
668 case INET_DIAG_BC_JMP:
669 yes = 0;
670 break;
671 case INET_DIAG_BC_S_EQ:
672 yes = entry->sport == op[1].no;
673 break;
674 case INET_DIAG_BC_S_GE:
675 yes = entry->sport >= op[1].no;
676 break;
677 case INET_DIAG_BC_S_LE:
678 yes = entry->sport <= op[1].no;
679 break;
680 case INET_DIAG_BC_D_EQ:
681 yes = entry->dport == op[1].no;
682 break;
683 case INET_DIAG_BC_D_GE:
684 yes = entry->dport >= op[1].no;
685 break;
686 case INET_DIAG_BC_D_LE:
687 yes = entry->dport <= op[1].no;
688 break;
689 case INET_DIAG_BC_AUTO:
690 yes = !(entry->userlocks & SOCK_BINDPORT_LOCK);
691 break;
692 case INET_DIAG_BC_S_COND:
693 case INET_DIAG_BC_D_COND: {
694 const struct inet_diag_hostcond *cond;
695 const __be32 *addr;
696
697 cond = (const struct inet_diag_hostcond *)(op + 1);
698 if (cond->port != -1 &&
699 cond->port != (op->code == INET_DIAG_BC_S_COND ?
700 entry->sport : entry->dport)) {
701 yes = 0;
702 break;
703 }
704
705 if (op->code == INET_DIAG_BC_S_COND)
706 addr = entry->saddr;
707 else
708 addr = entry->daddr;
709
710 if (cond->family != AF_UNSPEC &&
711 cond->family != entry->family) {
712 if (entry->family == AF_INET6 &&
713 cond->family == AF_INET) {
714 if (addr[0] == 0 && addr[1] == 0 &&
715 addr[2] == htonl(0xffff) &&
716 bitstring_match(addr + 3,
717 cond->addr,
718 cond->prefix_len))
719 break;
720 }
721 yes = 0;
722 break;
723 }
724
725 if (cond->prefix_len == 0)
726 break;
727 if (bitstring_match(addr, cond->addr,
728 cond->prefix_len))
729 break;
730 yes = 0;
731 break;
732 }
733 case INET_DIAG_BC_DEV_COND: {
734 u32 ifindex;
735
736 ifindex = *((const u32 *)(op + 1));
737 if (ifindex != entry->ifindex)
738 yes = 0;
739 break;
740 }
741 case INET_DIAG_BC_MARK_COND: {
742 struct inet_diag_markcond *cond;
743
744 cond = (struct inet_diag_markcond *)(op + 1);
745 if ((entry->mark & cond->mask) != cond->mark)
746 yes = 0;
747 break;
748 }
749#ifdef CONFIG_SOCK_CGROUP_DATA
750 case INET_DIAG_BC_CGROUP_COND: {
751 u64 cgroup_id;
752
753 cgroup_id = get_unaligned((const u64 *)(op + 1));
754 if (cgroup_id != entry->cgroup_id)
755 yes = 0;
756 break;
757 }
758#endif
759 }
760
761 if (yes) {
762 len -= op->yes;
763 bc += op->yes;
764 } else {
765 len -= op->no;
766 bc += op->no;
767 }
768 }
769 return len == 0;
770}
771
772/* This helper is available for all sockets (ESTABLISH, TIMEWAIT, SYN_RECV)
773 */
774static void entry_fill_addrs(struct inet_diag_entry *entry,
775 const struct sock *sk)
776{
777#if IS_ENABLED(CONFIG_IPV6)
778 if (sk->sk_family == AF_INET6) {
779 entry->saddr = sk->sk_v6_rcv_saddr.s6_addr32;
780 entry->daddr = sk->sk_v6_daddr.s6_addr32;
781 } else
782#endif
783 {
784 entry->saddr = &sk->sk_rcv_saddr;
785 entry->daddr = &sk->sk_daddr;
786 }
787}
788
789int inet_diag_bc_sk(const struct nlattr *bc, struct sock *sk)
790{
791 struct inet_sock *inet = inet_sk(sk);
792 struct inet_diag_entry entry;
793
794 if (!bc)
795 return 1;
796
797 entry.family = sk->sk_family;
798 entry_fill_addrs(&entry, sk);
799 entry.sport = inet->inet_num;
800 entry.dport = ntohs(inet->inet_dport);
801 entry.ifindex = sk->sk_bound_dev_if;
802 entry.userlocks = sk_fullsock(sk) ? sk->sk_userlocks : 0;
803 if (sk_fullsock(sk))
804 entry.mark = sk->sk_mark;
805 else if (sk->sk_state == TCP_NEW_SYN_RECV)
806 entry.mark = inet_rsk(inet_reqsk(sk))->ir_mark;
807 else if (sk->sk_state == TCP_TIME_WAIT)
808 entry.mark = inet_twsk(sk)->tw_mark;
809 else
810 entry.mark = 0;
811#ifdef CONFIG_SOCK_CGROUP_DATA
812 entry.cgroup_id = sk_fullsock(sk) ?
813 cgroup_id(sock_cgroup_ptr(&sk->sk_cgrp_data)) : 0;
814#endif
815
816 return inet_diag_bc_run(bc, &entry);
817}
818EXPORT_SYMBOL_GPL(inet_diag_bc_sk);
819
820static int valid_cc(const void *bc, int len, int cc)
821{
822 while (len >= 0) {
823 const struct inet_diag_bc_op *op = bc;
824
825 if (cc > len)
826 return 0;
827 if (cc == len)
828 return 1;
829 if (op->yes < 4 || op->yes & 3)
830 return 0;
831 len -= op->yes;
832 bc += op->yes;
833 }
834 return 0;
835}
836
837/* data is u32 ifindex */
838static bool valid_devcond(const struct inet_diag_bc_op *op, int len,
839 int *min_len)
840{
841 /* Check ifindex space. */
842 *min_len += sizeof(u32);
843 if (len < *min_len)
844 return false;
845
846 return true;
847}
848/* Validate an inet_diag_hostcond. */
849static bool valid_hostcond(const struct inet_diag_bc_op *op, int len,
850 int *min_len)
851{
852 struct inet_diag_hostcond *cond;
853 int addr_len;
854
855 /* Check hostcond space. */
856 *min_len += sizeof(struct inet_diag_hostcond);
857 if (len < *min_len)
858 return false;
859 cond = (struct inet_diag_hostcond *)(op + 1);
860
861 /* Check address family and address length. */
862 switch (cond->family) {
863 case AF_UNSPEC:
864 addr_len = 0;
865 break;
866 case AF_INET:
867 addr_len = sizeof(struct in_addr);
868 break;
869 case AF_INET6:
870 addr_len = sizeof(struct in6_addr);
871 break;
872 default:
873 return false;
874 }
875 *min_len += addr_len;
876 if (len < *min_len)
877 return false;
878
879 /* Check prefix length (in bits) vs address length (in bytes). */
880 if (cond->prefix_len > 8 * addr_len)
881 return false;
882
883 return true;
884}
885
886/* Validate a port comparison operator. */
887static bool valid_port_comparison(const struct inet_diag_bc_op *op,
888 int len, int *min_len)
889{
890 /* Port comparisons put the port in a follow-on inet_diag_bc_op. */
891 *min_len += sizeof(struct inet_diag_bc_op);
892 if (len < *min_len)
893 return false;
894 return true;
895}
896
897static bool valid_markcond(const struct inet_diag_bc_op *op, int len,
898 int *min_len)
899{
900 *min_len += sizeof(struct inet_diag_markcond);
901 return len >= *min_len;
902}
903
904#ifdef CONFIG_SOCK_CGROUP_DATA
905static bool valid_cgroupcond(const struct inet_diag_bc_op *op, int len,
906 int *min_len)
907{
908 *min_len += sizeof(u64);
909 return len >= *min_len;
910}
911#endif
912
913static int inet_diag_bc_audit(const struct nlattr *attr,
914 const struct sk_buff *skb)
915{
916 bool net_admin = netlink_net_capable(skb, CAP_NET_ADMIN);
917 const void *bytecode, *bc;
918 int bytecode_len, len;
919
920 if (!attr || nla_len(attr) < sizeof(struct inet_diag_bc_op))
921 return -EINVAL;
922
923 bytecode = bc = nla_data(attr);
924 len = bytecode_len = nla_len(attr);
925
926 while (len > 0) {
927 int min_len = sizeof(struct inet_diag_bc_op);
928 const struct inet_diag_bc_op *op = bc;
929
930 switch (op->code) {
931 case INET_DIAG_BC_S_COND:
932 case INET_DIAG_BC_D_COND:
933 if (!valid_hostcond(bc, len, &min_len))
934 return -EINVAL;
935 break;
936 case INET_DIAG_BC_DEV_COND:
937 if (!valid_devcond(bc, len, &min_len))
938 return -EINVAL;
939 break;
940 case INET_DIAG_BC_S_EQ:
941 case INET_DIAG_BC_S_GE:
942 case INET_DIAG_BC_S_LE:
943 case INET_DIAG_BC_D_EQ:
944 case INET_DIAG_BC_D_GE:
945 case INET_DIAG_BC_D_LE:
946 if (!valid_port_comparison(bc, len, &min_len))
947 return -EINVAL;
948 break;
949 case INET_DIAG_BC_MARK_COND:
950 if (!net_admin)
951 return -EPERM;
952 if (!valid_markcond(bc, len, &min_len))
953 return -EINVAL;
954 break;
955#ifdef CONFIG_SOCK_CGROUP_DATA
956 case INET_DIAG_BC_CGROUP_COND:
957 if (!valid_cgroupcond(bc, len, &min_len))
958 return -EINVAL;
959 break;
960#endif
961 case INET_DIAG_BC_AUTO:
962 case INET_DIAG_BC_JMP:
963 case INET_DIAG_BC_NOP:
964 break;
965 default:
966 return -EINVAL;
967 }
968
969 if (op->code != INET_DIAG_BC_NOP) {
970 if (op->no < min_len || op->no > len + 4 || op->no & 3)
971 return -EINVAL;
972 if (op->no < len &&
973 !valid_cc(bytecode, bytecode_len, len - op->no))
974 return -EINVAL;
975 }
976
977 if (op->yes < min_len || op->yes > len + 4 || op->yes & 3)
978 return -EINVAL;
979 bc += op->yes;
980 len -= op->yes;
981 }
982 return len == 0 ? 0 : -EINVAL;
983}
984
985static void twsk_build_assert(void)
986{
987 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_family) !=
988 offsetof(struct sock, sk_family));
989
990 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_num) !=
991 offsetof(struct inet_sock, inet_num));
992
993 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_dport) !=
994 offsetof(struct inet_sock, inet_dport));
995
996 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_rcv_saddr) !=
997 offsetof(struct inet_sock, inet_rcv_saddr));
998
999 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_daddr) !=
1000 offsetof(struct inet_sock, inet_daddr));
1001
1002#if IS_ENABLED(CONFIG_IPV6)
1003 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_v6_rcv_saddr) !=
1004 offsetof(struct sock, sk_v6_rcv_saddr));
1005
1006 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_v6_daddr) !=
1007 offsetof(struct sock, sk_v6_daddr));
1008#endif
1009}
1010
1011void inet_diag_dump_icsk(struct inet_hashinfo *hashinfo, struct sk_buff *skb,
1012 struct netlink_callback *cb,
1013 const struct inet_diag_req_v2 *r)
1014{
1015 bool net_admin = netlink_net_capable(cb->skb, CAP_NET_ADMIN);
1016 struct inet_diag_dump_data *cb_data = cb->data;
1017 struct net *net = sock_net(skb->sk);
1018 u32 idiag_states = r->idiag_states;
1019 int i, num, s_i, s_num;
1020 struct nlattr *bc;
1021 struct sock *sk;
1022
1023 bc = cb_data->inet_diag_nla_bc;
1024 if (idiag_states & TCPF_SYN_RECV)
1025 idiag_states |= TCPF_NEW_SYN_RECV;
1026 s_i = cb->args[1];
1027 s_num = num = cb->args[2];
1028
1029 if (cb->args[0] == 0) {
1030 if (!(idiag_states & TCPF_LISTEN) || r->id.idiag_dport)
1031 goto skip_listen_ht;
1032
1033 for (i = s_i; i < INET_LHTABLE_SIZE; i++) {
1034 struct inet_listen_hashbucket *ilb;
1035 struct hlist_nulls_node *node;
1036
1037 num = 0;
1038 ilb = &hashinfo->listening_hash[i];
1039 spin_lock(&ilb->lock);
1040 sk_nulls_for_each(sk, node, &ilb->nulls_head) {
1041 struct inet_sock *inet = inet_sk(sk);
1042
1043 if (!net_eq(sock_net(sk), net))
1044 continue;
1045
1046 if (num < s_num) {
1047 num++;
1048 continue;
1049 }
1050
1051 if (r->sdiag_family != AF_UNSPEC &&
1052 sk->sk_family != r->sdiag_family)
1053 goto next_listen;
1054
1055 if (r->id.idiag_sport != inet->inet_sport &&
1056 r->id.idiag_sport)
1057 goto next_listen;
1058
1059 if (!inet_diag_bc_sk(bc, sk))
1060 goto next_listen;
1061
1062 if (inet_sk_diag_fill(sk, inet_csk(sk), skb,
1063 cb, r, NLM_F_MULTI,
1064 net_admin) < 0) {
1065 spin_unlock(&ilb->lock);
1066 goto done;
1067 }
1068
1069next_listen:
1070 ++num;
1071 }
1072 spin_unlock(&ilb->lock);
1073
1074 s_num = 0;
1075 }
1076skip_listen_ht:
1077 cb->args[0] = 1;
1078 s_i = num = s_num = 0;
1079 }
1080
1081 if (!(idiag_states & ~TCPF_LISTEN))
1082 goto out;
1083
1084#define SKARR_SZ 16
1085 for (i = s_i; i <= hashinfo->ehash_mask; i++) {
1086 struct inet_ehash_bucket *head = &hashinfo->ehash[i];
1087 spinlock_t *lock = inet_ehash_lockp(hashinfo, i);
1088 struct hlist_nulls_node *node;
1089 struct sock *sk_arr[SKARR_SZ];
1090 int num_arr[SKARR_SZ];
1091 int idx, accum, res;
1092
1093 if (hlist_nulls_empty(&head->chain))
1094 continue;
1095
1096 if (i > s_i)
1097 s_num = 0;
1098
1099next_chunk:
1100 num = 0;
1101 accum = 0;
1102 spin_lock_bh(lock);
1103 sk_nulls_for_each(sk, node, &head->chain) {
1104 int state;
1105
1106 if (!net_eq(sock_net(sk), net))
1107 continue;
1108 if (num < s_num)
1109 goto next_normal;
1110 state = (sk->sk_state == TCP_TIME_WAIT) ?
1111 inet_twsk(sk)->tw_substate : sk->sk_state;
1112 if (!(idiag_states & (1 << state)))
1113 goto next_normal;
1114 if (r->sdiag_family != AF_UNSPEC &&
1115 sk->sk_family != r->sdiag_family)
1116 goto next_normal;
1117 if (r->id.idiag_sport != htons(sk->sk_num) &&
1118 r->id.idiag_sport)
1119 goto next_normal;
1120 if (r->id.idiag_dport != sk->sk_dport &&
1121 r->id.idiag_dport)
1122 goto next_normal;
1123 twsk_build_assert();
1124
1125 if (!inet_diag_bc_sk(bc, sk))
1126 goto next_normal;
1127
1128 if (!refcount_inc_not_zero(&sk->sk_refcnt))
1129 goto next_normal;
1130
1131 num_arr[accum] = num;
1132 sk_arr[accum] = sk;
1133 if (++accum == SKARR_SZ)
1134 break;
1135next_normal:
1136 ++num;
1137 }
1138 spin_unlock_bh(lock);
1139 res = 0;
1140 for (idx = 0; idx < accum; idx++) {
1141 if (res >= 0) {
1142 res = sk_diag_fill(sk_arr[idx], skb, cb, r,
1143 NLM_F_MULTI, net_admin);
1144 if (res < 0)
1145 num = num_arr[idx];
1146 }
1147 sock_gen_put(sk_arr[idx]);
1148 }
1149 if (res < 0)
1150 break;
1151 cond_resched();
1152 if (accum == SKARR_SZ) {
1153 s_num = num + 1;
1154 goto next_chunk;
1155 }
1156 }
1157
1158done:
1159 cb->args[1] = i;
1160 cb->args[2] = num;
1161out:
1162 ;
1163}
1164EXPORT_SYMBOL_GPL(inet_diag_dump_icsk);
1165
1166static int __inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb,
1167 const struct inet_diag_req_v2 *r)
1168{
1169 struct inet_diag_dump_data *cb_data = cb->data;
1170 const struct inet_diag_handler *handler;
1171 u32 prev_min_dump_alloc;
1172 int protocol, err = 0;
1173
1174 protocol = inet_diag_get_protocol(r, cb_data);
1175
1176again:
1177 prev_min_dump_alloc = cb->min_dump_alloc;
1178 handler = inet_diag_lock_handler(protocol);
1179 if (!IS_ERR(handler))
1180 handler->dump(skb, cb, r);
1181 else
1182 err = PTR_ERR(handler);
1183 inet_diag_unlock_handler(handler);
1184
1185 /* The skb is not large enough to fit one sk info and
1186 * inet_sk_diag_fill() has requested for a larger skb.
1187 */
1188 if (!skb->len && cb->min_dump_alloc > prev_min_dump_alloc) {
1189 err = pskb_expand_head(skb, 0, cb->min_dump_alloc, GFP_KERNEL);
1190 if (!err)
1191 goto again;
1192 }
1193
1194 return err ? : skb->len;
1195}
1196
1197static int inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb)
1198{
1199 return __inet_diag_dump(skb, cb, nlmsg_data(cb->nlh));
1200}
1201
1202static int __inet_diag_dump_start(struct netlink_callback *cb, int hdrlen)
1203{
1204 const struct nlmsghdr *nlh = cb->nlh;
1205 struct inet_diag_dump_data *cb_data;
1206 struct sk_buff *skb = cb->skb;
1207 struct nlattr *nla;
1208 int err;
1209
1210 cb_data = kzalloc(sizeof(*cb_data), GFP_KERNEL);
1211 if (!cb_data)
1212 return -ENOMEM;
1213
1214 err = inet_diag_parse_attrs(nlh, hdrlen, cb_data->req_nlas);
1215 if (err) {
1216 kfree(cb_data);
1217 return err;
1218 }
1219 nla = cb_data->inet_diag_nla_bc;
1220 if (nla) {
1221 err = inet_diag_bc_audit(nla, skb);
1222 if (err) {
1223 kfree(cb_data);
1224 return err;
1225 }
1226 }
1227
1228 nla = cb_data->inet_diag_nla_bpf_stgs;
1229 if (nla) {
1230 struct bpf_sk_storage_diag *bpf_stg_diag;
1231
1232 bpf_stg_diag = bpf_sk_storage_diag_alloc(nla);
1233 if (IS_ERR(bpf_stg_diag)) {
1234 kfree(cb_data);
1235 return PTR_ERR(bpf_stg_diag);
1236 }
1237 cb_data->bpf_stg_diag = bpf_stg_diag;
1238 }
1239
1240 cb->data = cb_data;
1241 return 0;
1242}
1243
1244static int inet_diag_dump_start(struct netlink_callback *cb)
1245{
1246 return __inet_diag_dump_start(cb, sizeof(struct inet_diag_req_v2));
1247}
1248
1249static int inet_diag_dump_start_compat(struct netlink_callback *cb)
1250{
1251 return __inet_diag_dump_start(cb, sizeof(struct inet_diag_req));
1252}
1253
1254static int inet_diag_dump_done(struct netlink_callback *cb)
1255{
1256 struct inet_diag_dump_data *cb_data = cb->data;
1257
1258 bpf_sk_storage_diag_free(cb_data->bpf_stg_diag);
1259 kfree(cb->data);
1260
1261 return 0;
1262}
1263
1264static int inet_diag_type2proto(int type)
1265{
1266 switch (type) {
1267 case TCPDIAG_GETSOCK:
1268 return IPPROTO_TCP;
1269 case DCCPDIAG_GETSOCK:
1270 return IPPROTO_DCCP;
1271 default:
1272 return 0;
1273 }
1274}
1275
1276static int inet_diag_dump_compat(struct sk_buff *skb,
1277 struct netlink_callback *cb)
1278{
1279 struct inet_diag_req *rc = nlmsg_data(cb->nlh);
1280 struct inet_diag_req_v2 req;
1281
1282 req.sdiag_family = AF_UNSPEC; /* compatibility */
1283 req.sdiag_protocol = inet_diag_type2proto(cb->nlh->nlmsg_type);
1284 req.idiag_ext = rc->idiag_ext;
1285 req.idiag_states = rc->idiag_states;
1286 req.id = rc->id;
1287
1288 return __inet_diag_dump(skb, cb, &req);
1289}
1290
1291static int inet_diag_get_exact_compat(struct sk_buff *in_skb,
1292 const struct nlmsghdr *nlh)
1293{
1294 struct inet_diag_req *rc = nlmsg_data(nlh);
1295 struct inet_diag_req_v2 req;
1296
1297 req.sdiag_family = rc->idiag_family;
1298 req.sdiag_protocol = inet_diag_type2proto(nlh->nlmsg_type);
1299 req.idiag_ext = rc->idiag_ext;
1300 req.idiag_states = rc->idiag_states;
1301 req.id = rc->id;
1302
1303 return inet_diag_cmd_exact(SOCK_DIAG_BY_FAMILY, in_skb, nlh,
1304 sizeof(struct inet_diag_req), &req);
1305}
1306
1307static int inet_diag_rcv_msg_compat(struct sk_buff *skb, struct nlmsghdr *nlh)
1308{
1309 int hdrlen = sizeof(struct inet_diag_req);
1310 struct net *net = sock_net(skb->sk);
1311
1312 if (nlh->nlmsg_type >= INET_DIAG_GETSOCK_MAX ||
1313 nlmsg_len(nlh) < hdrlen)
1314 return -EINVAL;
1315
1316 if (nlh->nlmsg_flags & NLM_F_DUMP) {
1317 struct netlink_dump_control c = {
1318 .start = inet_diag_dump_start_compat,
1319 .done = inet_diag_dump_done,
1320 .dump = inet_diag_dump_compat,
1321 };
1322 return netlink_dump_start(net->diag_nlsk, skb, nlh, &c);
1323 }
1324
1325 return inet_diag_get_exact_compat(skb, nlh);
1326}
1327
1328static int inet_diag_handler_cmd(struct sk_buff *skb, struct nlmsghdr *h)
1329{
1330 int hdrlen = sizeof(struct inet_diag_req_v2);
1331 struct net *net = sock_net(skb->sk);
1332
1333 if (nlmsg_len(h) < hdrlen)
1334 return -EINVAL;
1335
1336 if (h->nlmsg_type == SOCK_DIAG_BY_FAMILY &&
1337 h->nlmsg_flags & NLM_F_DUMP) {
1338 struct netlink_dump_control c = {
1339 .start = inet_diag_dump_start,
1340 .done = inet_diag_dump_done,
1341 .dump = inet_diag_dump,
1342 };
1343 return netlink_dump_start(net->diag_nlsk, skb, h, &c);
1344 }
1345
1346 return inet_diag_cmd_exact(h->nlmsg_type, skb, h, hdrlen,
1347 nlmsg_data(h));
1348}
1349
1350static
1351int inet_diag_handler_get_info(struct sk_buff *skb, struct sock *sk)
1352{
1353 const struct inet_diag_handler *handler;
1354 struct nlmsghdr *nlh;
1355 struct nlattr *attr;
1356 struct inet_diag_msg *r;
1357 void *info = NULL;
1358 int err = 0;
1359
1360 nlh = nlmsg_put(skb, 0, 0, SOCK_DIAG_BY_FAMILY, sizeof(*r), 0);
1361 if (!nlh)
1362 return -ENOMEM;
1363
1364 r = nlmsg_data(nlh);
1365 memset(r, 0, sizeof(*r));
1366 inet_diag_msg_common_fill(r, sk);
1367 if (sk->sk_type == SOCK_DGRAM || sk->sk_type == SOCK_STREAM)
1368 r->id.idiag_sport = inet_sk(sk)->inet_sport;
1369 r->idiag_state = sk->sk_state;
1370
1371 if ((err = nla_put_u8(skb, INET_DIAG_PROTOCOL, sk->sk_protocol))) {
1372 nlmsg_cancel(skb, nlh);
1373 return err;
1374 }
1375
1376 handler = inet_diag_lock_handler(sk->sk_protocol);
1377 if (IS_ERR(handler)) {
1378 inet_diag_unlock_handler(handler);
1379 nlmsg_cancel(skb, nlh);
1380 return PTR_ERR(handler);
1381 }
1382
1383 attr = handler->idiag_info_size
1384 ? nla_reserve_64bit(skb, INET_DIAG_INFO,
1385 handler->idiag_info_size,
1386 INET_DIAG_PAD)
1387 : NULL;
1388 if (attr)
1389 info = nla_data(attr);
1390
1391 handler->idiag_get_info(sk, r, info);
1392 inet_diag_unlock_handler(handler);
1393
1394 nlmsg_end(skb, nlh);
1395 return 0;
1396}
1397
1398static const struct sock_diag_handler inet_diag_handler = {
1399 .family = AF_INET,
1400 .dump = inet_diag_handler_cmd,
1401 .get_info = inet_diag_handler_get_info,
1402 .destroy = inet_diag_handler_cmd,
1403};
1404
1405static const struct sock_diag_handler inet6_diag_handler = {
1406 .family = AF_INET6,
1407 .dump = inet_diag_handler_cmd,
1408 .get_info = inet_diag_handler_get_info,
1409 .destroy = inet_diag_handler_cmd,
1410};
1411
1412int inet_diag_register(const struct inet_diag_handler *h)
1413{
1414 const __u16 type = h->idiag_type;
1415 int err = -EINVAL;
1416
1417 if (type >= IPPROTO_MAX)
1418 goto out;
1419
1420 mutex_lock(&inet_diag_table_mutex);
1421 err = -EEXIST;
1422 if (!inet_diag_table[type]) {
1423 inet_diag_table[type] = h;
1424 err = 0;
1425 }
1426 mutex_unlock(&inet_diag_table_mutex);
1427out:
1428 return err;
1429}
1430EXPORT_SYMBOL_GPL(inet_diag_register);
1431
1432void inet_diag_unregister(const struct inet_diag_handler *h)
1433{
1434 const __u16 type = h->idiag_type;
1435
1436 if (type >= IPPROTO_MAX)
1437 return;
1438
1439 mutex_lock(&inet_diag_table_mutex);
1440 inet_diag_table[type] = NULL;
1441 mutex_unlock(&inet_diag_table_mutex);
1442}
1443EXPORT_SYMBOL_GPL(inet_diag_unregister);
1444
1445static int __init inet_diag_init(void)
1446{
1447 const int inet_diag_table_size = (IPPROTO_MAX *
1448 sizeof(struct inet_diag_handler *));
1449 int err = -ENOMEM;
1450
1451 inet_diag_table = kzalloc(inet_diag_table_size, GFP_KERNEL);
1452 if (!inet_diag_table)
1453 goto out;
1454
1455 err = sock_diag_register(&inet_diag_handler);
1456 if (err)
1457 goto out_free_nl;
1458
1459 err = sock_diag_register(&inet6_diag_handler);
1460 if (err)
1461 goto out_free_inet;
1462
1463 sock_diag_register_inet_compat(inet_diag_rcv_msg_compat);
1464out:
1465 return err;
1466
1467out_free_inet:
1468 sock_diag_unregister(&inet_diag_handler);
1469out_free_nl:
1470 kfree(inet_diag_table);
1471 goto out;
1472}
1473
1474static void __exit inet_diag_exit(void)
1475{
1476 sock_diag_unregister(&inet6_diag_handler);
1477 sock_diag_unregister(&inet_diag_handler);
1478 sock_diag_unregister_inet_compat(inet_diag_rcv_msg_compat);
1479 kfree(inet_diag_table);
1480}
1481
1482module_init(inet_diag_init);
1483module_exit(inet_diag_exit);
1484MODULE_LICENSE("GPL");
1485MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 2 /* AF_INET */);
1486MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 10 /* AF_INET6 */);
1/*
2 * inet_diag.c Module for monitoring INET transport protocols sockets.
3 *
4 * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * as published by the Free Software Foundation; either version
9 * 2 of the License, or (at your option) any later version.
10 */
11
12#include <linux/kernel.h>
13#include <linux/module.h>
14#include <linux/types.h>
15#include <linux/fcntl.h>
16#include <linux/random.h>
17#include <linux/slab.h>
18#include <linux/cache.h>
19#include <linux/init.h>
20#include <linux/time.h>
21
22#include <net/icmp.h>
23#include <net/tcp.h>
24#include <net/ipv6.h>
25#include <net/inet_common.h>
26#include <net/inet_connection_sock.h>
27#include <net/inet_hashtables.h>
28#include <net/inet_timewait_sock.h>
29#include <net/inet6_hashtables.h>
30#include <net/netlink.h>
31
32#include <linux/inet.h>
33#include <linux/stddef.h>
34
35#include <linux/inet_diag.h>
36#include <linux/sock_diag.h>
37
38static const struct inet_diag_handler **inet_diag_table;
39
40struct inet_diag_entry {
41 const __be32 *saddr;
42 const __be32 *daddr;
43 u16 sport;
44 u16 dport;
45 u16 family;
46 u16 userlocks;
47 u32 ifindex;
48 u32 mark;
49};
50
51static DEFINE_MUTEX(inet_diag_table_mutex);
52
53static const struct inet_diag_handler *inet_diag_lock_handler(int proto)
54{
55 if (!inet_diag_table[proto])
56 sock_load_diag_module(AF_INET, proto);
57
58 mutex_lock(&inet_diag_table_mutex);
59 if (!inet_diag_table[proto])
60 return ERR_PTR(-ENOENT);
61
62 return inet_diag_table[proto];
63}
64
65static void inet_diag_unlock_handler(const struct inet_diag_handler *handler)
66{
67 mutex_unlock(&inet_diag_table_mutex);
68}
69
70void inet_diag_msg_common_fill(struct inet_diag_msg *r, struct sock *sk)
71{
72 r->idiag_family = sk->sk_family;
73
74 r->id.idiag_sport = htons(sk->sk_num);
75 r->id.idiag_dport = sk->sk_dport;
76 r->id.idiag_if = sk->sk_bound_dev_if;
77 sock_diag_save_cookie(sk, r->id.idiag_cookie);
78
79#if IS_ENABLED(CONFIG_IPV6)
80 if (sk->sk_family == AF_INET6) {
81 *(struct in6_addr *)r->id.idiag_src = sk->sk_v6_rcv_saddr;
82 *(struct in6_addr *)r->id.idiag_dst = sk->sk_v6_daddr;
83 } else
84#endif
85 {
86 memset(&r->id.idiag_src, 0, sizeof(r->id.idiag_src));
87 memset(&r->id.idiag_dst, 0, sizeof(r->id.idiag_dst));
88
89 r->id.idiag_src[0] = sk->sk_rcv_saddr;
90 r->id.idiag_dst[0] = sk->sk_daddr;
91 }
92}
93EXPORT_SYMBOL_GPL(inet_diag_msg_common_fill);
94
95static size_t inet_sk_attr_size(struct sock *sk,
96 const struct inet_diag_req_v2 *req,
97 bool net_admin)
98{
99 const struct inet_diag_handler *handler;
100 size_t aux = 0;
101
102 handler = inet_diag_table[req->sdiag_protocol];
103 if (handler && handler->idiag_get_aux_size)
104 aux = handler->idiag_get_aux_size(sk, net_admin);
105
106 return nla_total_size(sizeof(struct tcp_info))
107 + nla_total_size(1) /* INET_DIAG_SHUTDOWN */
108 + nla_total_size(1) /* INET_DIAG_TOS */
109 + nla_total_size(1) /* INET_DIAG_TCLASS */
110 + nla_total_size(4) /* INET_DIAG_MARK */
111 + nla_total_size(sizeof(struct inet_diag_meminfo))
112 + nla_total_size(sizeof(struct inet_diag_msg))
113 + nla_total_size(SK_MEMINFO_VARS * sizeof(u32))
114 + nla_total_size(TCP_CA_NAME_MAX)
115 + nla_total_size(sizeof(struct tcpvegas_info))
116 + aux
117 + 64;
118}
119
120int inet_diag_msg_attrs_fill(struct sock *sk, struct sk_buff *skb,
121 struct inet_diag_msg *r, int ext,
122 struct user_namespace *user_ns,
123 bool net_admin)
124{
125 const struct inet_sock *inet = inet_sk(sk);
126
127 if (nla_put_u8(skb, INET_DIAG_SHUTDOWN, sk->sk_shutdown))
128 goto errout;
129
130 /* IPv6 dual-stack sockets use inet->tos for IPv4 connections,
131 * hence this needs to be included regardless of socket family.
132 */
133 if (ext & (1 << (INET_DIAG_TOS - 1)))
134 if (nla_put_u8(skb, INET_DIAG_TOS, inet->tos) < 0)
135 goto errout;
136
137#if IS_ENABLED(CONFIG_IPV6)
138 if (r->idiag_family == AF_INET6) {
139 if (ext & (1 << (INET_DIAG_TCLASS - 1)))
140 if (nla_put_u8(skb, INET_DIAG_TCLASS,
141 inet6_sk(sk)->tclass) < 0)
142 goto errout;
143
144 if (((1 << sk->sk_state) & (TCPF_LISTEN | TCPF_CLOSE)) &&
145 nla_put_u8(skb, INET_DIAG_SKV6ONLY, ipv6_only_sock(sk)))
146 goto errout;
147 }
148#endif
149
150 if (net_admin && nla_put_u32(skb, INET_DIAG_MARK, sk->sk_mark))
151 goto errout;
152
153 r->idiag_uid = from_kuid_munged(user_ns, sock_i_uid(sk));
154 r->idiag_inode = sock_i_ino(sk);
155
156 return 0;
157errout:
158 return 1;
159}
160EXPORT_SYMBOL_GPL(inet_diag_msg_attrs_fill);
161
162int inet_sk_diag_fill(struct sock *sk, struct inet_connection_sock *icsk,
163 struct sk_buff *skb, const struct inet_diag_req_v2 *req,
164 struct user_namespace *user_ns,
165 u32 portid, u32 seq, u16 nlmsg_flags,
166 const struct nlmsghdr *unlh,
167 bool net_admin)
168{
169 const struct tcp_congestion_ops *ca_ops;
170 const struct inet_diag_handler *handler;
171 int ext = req->idiag_ext;
172 struct inet_diag_msg *r;
173 struct nlmsghdr *nlh;
174 struct nlattr *attr;
175 void *info = NULL;
176
177 handler = inet_diag_table[req->sdiag_protocol];
178 BUG_ON(!handler);
179
180 nlh = nlmsg_put(skb, portid, seq, unlh->nlmsg_type, sizeof(*r),
181 nlmsg_flags);
182 if (!nlh)
183 return -EMSGSIZE;
184
185 r = nlmsg_data(nlh);
186 BUG_ON(!sk_fullsock(sk));
187
188 inet_diag_msg_common_fill(r, sk);
189 r->idiag_state = sk->sk_state;
190 r->idiag_timer = 0;
191 r->idiag_retrans = 0;
192
193 if (inet_diag_msg_attrs_fill(sk, skb, r, ext, user_ns, net_admin))
194 goto errout;
195
196 if (ext & (1 << (INET_DIAG_MEMINFO - 1))) {
197 struct inet_diag_meminfo minfo = {
198 .idiag_rmem = sk_rmem_alloc_get(sk),
199 .idiag_wmem = sk->sk_wmem_queued,
200 .idiag_fmem = sk->sk_forward_alloc,
201 .idiag_tmem = sk_wmem_alloc_get(sk),
202 };
203
204 if (nla_put(skb, INET_DIAG_MEMINFO, sizeof(minfo), &minfo) < 0)
205 goto errout;
206 }
207
208 if (ext & (1 << (INET_DIAG_SKMEMINFO - 1)))
209 if (sock_diag_put_meminfo(sk, skb, INET_DIAG_SKMEMINFO))
210 goto errout;
211
212 /*
213 * RAW sockets might have user-defined protocols assigned,
214 * so report the one supplied on socket creation.
215 */
216 if (sk->sk_type == SOCK_RAW) {
217 if (nla_put_u8(skb, INET_DIAG_PROTOCOL, sk->sk_protocol))
218 goto errout;
219 }
220
221 if (!icsk) {
222 handler->idiag_get_info(sk, r, NULL);
223 goto out;
224 }
225
226 if (icsk->icsk_pending == ICSK_TIME_RETRANS ||
227 icsk->icsk_pending == ICSK_TIME_REO_TIMEOUT ||
228 icsk->icsk_pending == ICSK_TIME_LOSS_PROBE) {
229 r->idiag_timer = 1;
230 r->idiag_retrans = icsk->icsk_retransmits;
231 r->idiag_expires =
232 jiffies_to_msecs(icsk->icsk_timeout - jiffies);
233 } else if (icsk->icsk_pending == ICSK_TIME_PROBE0) {
234 r->idiag_timer = 4;
235 r->idiag_retrans = icsk->icsk_probes_out;
236 r->idiag_expires =
237 jiffies_to_msecs(icsk->icsk_timeout - jiffies);
238 } else if (timer_pending(&sk->sk_timer)) {
239 r->idiag_timer = 2;
240 r->idiag_retrans = icsk->icsk_probes_out;
241 r->idiag_expires =
242 jiffies_to_msecs(sk->sk_timer.expires - jiffies);
243 } else {
244 r->idiag_timer = 0;
245 r->idiag_expires = 0;
246 }
247
248 if ((ext & (1 << (INET_DIAG_INFO - 1))) && handler->idiag_info_size) {
249 attr = nla_reserve_64bit(skb, INET_DIAG_INFO,
250 handler->idiag_info_size,
251 INET_DIAG_PAD);
252 if (!attr)
253 goto errout;
254
255 info = nla_data(attr);
256 }
257
258 if (ext & (1 << (INET_DIAG_CONG - 1))) {
259 int err = 0;
260
261 rcu_read_lock();
262 ca_ops = READ_ONCE(icsk->icsk_ca_ops);
263 if (ca_ops)
264 err = nla_put_string(skb, INET_DIAG_CONG, ca_ops->name);
265 rcu_read_unlock();
266 if (err < 0)
267 goto errout;
268 }
269
270 handler->idiag_get_info(sk, r, info);
271
272 if (ext & (1 << (INET_DIAG_INFO - 1)) && handler->idiag_get_aux)
273 if (handler->idiag_get_aux(sk, net_admin, skb) < 0)
274 goto errout;
275
276 if (sk->sk_state < TCP_TIME_WAIT) {
277 union tcp_cc_info info;
278 size_t sz = 0;
279 int attr;
280
281 rcu_read_lock();
282 ca_ops = READ_ONCE(icsk->icsk_ca_ops);
283 if (ca_ops && ca_ops->get_info)
284 sz = ca_ops->get_info(sk, ext, &attr, &info);
285 rcu_read_unlock();
286 if (sz && nla_put(skb, attr, sz, &info) < 0)
287 goto errout;
288 }
289
290 if (ext & (1 << (INET_DIAG_CLASS_ID - 1))) {
291 u32 classid = 0;
292
293#ifdef CONFIG_SOCK_CGROUP_DATA
294 classid = sock_cgroup_classid(&sk->sk_cgrp_data);
295#endif
296
297 if (nla_put_u32(skb, INET_DIAG_CLASS_ID, classid))
298 goto errout;
299 }
300
301out:
302 nlmsg_end(skb, nlh);
303 return 0;
304
305errout:
306 nlmsg_cancel(skb, nlh);
307 return -EMSGSIZE;
308}
309EXPORT_SYMBOL_GPL(inet_sk_diag_fill);
310
311static int inet_csk_diag_fill(struct sock *sk,
312 struct sk_buff *skb,
313 const struct inet_diag_req_v2 *req,
314 struct user_namespace *user_ns,
315 u32 portid, u32 seq, u16 nlmsg_flags,
316 const struct nlmsghdr *unlh,
317 bool net_admin)
318{
319 return inet_sk_diag_fill(sk, inet_csk(sk), skb, req, user_ns,
320 portid, seq, nlmsg_flags, unlh, net_admin);
321}
322
323static int inet_twsk_diag_fill(struct sock *sk,
324 struct sk_buff *skb,
325 u32 portid, u32 seq, u16 nlmsg_flags,
326 const struct nlmsghdr *unlh)
327{
328 struct inet_timewait_sock *tw = inet_twsk(sk);
329 struct inet_diag_msg *r;
330 struct nlmsghdr *nlh;
331 long tmo;
332
333 nlh = nlmsg_put(skb, portid, seq, unlh->nlmsg_type, sizeof(*r),
334 nlmsg_flags);
335 if (!nlh)
336 return -EMSGSIZE;
337
338 r = nlmsg_data(nlh);
339 BUG_ON(tw->tw_state != TCP_TIME_WAIT);
340
341 tmo = tw->tw_timer.expires - jiffies;
342 if (tmo < 0)
343 tmo = 0;
344
345 inet_diag_msg_common_fill(r, sk);
346 r->idiag_retrans = 0;
347
348 r->idiag_state = tw->tw_substate;
349 r->idiag_timer = 3;
350 r->idiag_expires = jiffies_to_msecs(tmo);
351 r->idiag_rqueue = 0;
352 r->idiag_wqueue = 0;
353 r->idiag_uid = 0;
354 r->idiag_inode = 0;
355
356 nlmsg_end(skb, nlh);
357 return 0;
358}
359
360static int inet_req_diag_fill(struct sock *sk, struct sk_buff *skb,
361 u32 portid, u32 seq, u16 nlmsg_flags,
362 const struct nlmsghdr *unlh, bool net_admin)
363{
364 struct request_sock *reqsk = inet_reqsk(sk);
365 struct inet_diag_msg *r;
366 struct nlmsghdr *nlh;
367 long tmo;
368
369 nlh = nlmsg_put(skb, portid, seq, unlh->nlmsg_type, sizeof(*r),
370 nlmsg_flags);
371 if (!nlh)
372 return -EMSGSIZE;
373
374 r = nlmsg_data(nlh);
375 inet_diag_msg_common_fill(r, sk);
376 r->idiag_state = TCP_SYN_RECV;
377 r->idiag_timer = 1;
378 r->idiag_retrans = reqsk->num_retrans;
379
380 BUILD_BUG_ON(offsetof(struct inet_request_sock, ir_cookie) !=
381 offsetof(struct sock, sk_cookie));
382
383 tmo = inet_reqsk(sk)->rsk_timer.expires - jiffies;
384 r->idiag_expires = (tmo >= 0) ? jiffies_to_msecs(tmo) : 0;
385 r->idiag_rqueue = 0;
386 r->idiag_wqueue = 0;
387 r->idiag_uid = 0;
388 r->idiag_inode = 0;
389
390 if (net_admin && nla_put_u32(skb, INET_DIAG_MARK,
391 inet_rsk(reqsk)->ir_mark))
392 return -EMSGSIZE;
393
394 nlmsg_end(skb, nlh);
395 return 0;
396}
397
398static int sk_diag_fill(struct sock *sk, struct sk_buff *skb,
399 const struct inet_diag_req_v2 *r,
400 struct user_namespace *user_ns,
401 u32 portid, u32 seq, u16 nlmsg_flags,
402 const struct nlmsghdr *unlh, bool net_admin)
403{
404 if (sk->sk_state == TCP_TIME_WAIT)
405 return inet_twsk_diag_fill(sk, skb, portid, seq,
406 nlmsg_flags, unlh);
407
408 if (sk->sk_state == TCP_NEW_SYN_RECV)
409 return inet_req_diag_fill(sk, skb, portid, seq,
410 nlmsg_flags, unlh, net_admin);
411
412 return inet_csk_diag_fill(sk, skb, r, user_ns, portid, seq,
413 nlmsg_flags, unlh, net_admin);
414}
415
416struct sock *inet_diag_find_one_icsk(struct net *net,
417 struct inet_hashinfo *hashinfo,
418 const struct inet_diag_req_v2 *req)
419{
420 struct sock *sk;
421
422 rcu_read_lock();
423 if (req->sdiag_family == AF_INET)
424 sk = inet_lookup(net, hashinfo, NULL, 0, req->id.idiag_dst[0],
425 req->id.idiag_dport, req->id.idiag_src[0],
426 req->id.idiag_sport, req->id.idiag_if);
427#if IS_ENABLED(CONFIG_IPV6)
428 else if (req->sdiag_family == AF_INET6) {
429 if (ipv6_addr_v4mapped((struct in6_addr *)req->id.idiag_dst) &&
430 ipv6_addr_v4mapped((struct in6_addr *)req->id.idiag_src))
431 sk = inet_lookup(net, hashinfo, NULL, 0, req->id.idiag_dst[3],
432 req->id.idiag_dport, req->id.idiag_src[3],
433 req->id.idiag_sport, req->id.idiag_if);
434 else
435 sk = inet6_lookup(net, hashinfo, NULL, 0,
436 (struct in6_addr *)req->id.idiag_dst,
437 req->id.idiag_dport,
438 (struct in6_addr *)req->id.idiag_src,
439 req->id.idiag_sport,
440 req->id.idiag_if);
441 }
442#endif
443 else {
444 rcu_read_unlock();
445 return ERR_PTR(-EINVAL);
446 }
447 rcu_read_unlock();
448 if (!sk)
449 return ERR_PTR(-ENOENT);
450
451 if (sock_diag_check_cookie(sk, req->id.idiag_cookie)) {
452 sock_gen_put(sk);
453 return ERR_PTR(-ENOENT);
454 }
455
456 return sk;
457}
458EXPORT_SYMBOL_GPL(inet_diag_find_one_icsk);
459
460int inet_diag_dump_one_icsk(struct inet_hashinfo *hashinfo,
461 struct sk_buff *in_skb,
462 const struct nlmsghdr *nlh,
463 const struct inet_diag_req_v2 *req)
464{
465 bool net_admin = netlink_net_capable(in_skb, CAP_NET_ADMIN);
466 struct net *net = sock_net(in_skb->sk);
467 struct sk_buff *rep;
468 struct sock *sk;
469 int err;
470
471 sk = inet_diag_find_one_icsk(net, hashinfo, req);
472 if (IS_ERR(sk))
473 return PTR_ERR(sk);
474
475 rep = nlmsg_new(inet_sk_attr_size(sk, req, net_admin), GFP_KERNEL);
476 if (!rep) {
477 err = -ENOMEM;
478 goto out;
479 }
480
481 err = sk_diag_fill(sk, rep, req,
482 sk_user_ns(NETLINK_CB(in_skb).sk),
483 NETLINK_CB(in_skb).portid,
484 nlh->nlmsg_seq, 0, nlh, net_admin);
485 if (err < 0) {
486 WARN_ON(err == -EMSGSIZE);
487 nlmsg_free(rep);
488 goto out;
489 }
490 err = netlink_unicast(net->diag_nlsk, rep, NETLINK_CB(in_skb).portid,
491 MSG_DONTWAIT);
492 if (err > 0)
493 err = 0;
494
495out:
496 if (sk)
497 sock_gen_put(sk);
498
499 return err;
500}
501EXPORT_SYMBOL_GPL(inet_diag_dump_one_icsk);
502
503static int inet_diag_cmd_exact(int cmd, struct sk_buff *in_skb,
504 const struct nlmsghdr *nlh,
505 const struct inet_diag_req_v2 *req)
506{
507 const struct inet_diag_handler *handler;
508 int err;
509
510 handler = inet_diag_lock_handler(req->sdiag_protocol);
511 if (IS_ERR(handler))
512 err = PTR_ERR(handler);
513 else if (cmd == SOCK_DIAG_BY_FAMILY)
514 err = handler->dump_one(in_skb, nlh, req);
515 else if (cmd == SOCK_DESTROY && handler->destroy)
516 err = handler->destroy(in_skb, req);
517 else
518 err = -EOPNOTSUPP;
519 inet_diag_unlock_handler(handler);
520
521 return err;
522}
523
524static int bitstring_match(const __be32 *a1, const __be32 *a2, int bits)
525{
526 int words = bits >> 5;
527
528 bits &= 0x1f;
529
530 if (words) {
531 if (memcmp(a1, a2, words << 2))
532 return 0;
533 }
534 if (bits) {
535 __be32 w1, w2;
536 __be32 mask;
537
538 w1 = a1[words];
539 w2 = a2[words];
540
541 mask = htonl((0xffffffff) << (32 - bits));
542
543 if ((w1 ^ w2) & mask)
544 return 0;
545 }
546
547 return 1;
548}
549
550static int inet_diag_bc_run(const struct nlattr *_bc,
551 const struct inet_diag_entry *entry)
552{
553 const void *bc = nla_data(_bc);
554 int len = nla_len(_bc);
555
556 while (len > 0) {
557 int yes = 1;
558 const struct inet_diag_bc_op *op = bc;
559
560 switch (op->code) {
561 case INET_DIAG_BC_NOP:
562 break;
563 case INET_DIAG_BC_JMP:
564 yes = 0;
565 break;
566 case INET_DIAG_BC_S_EQ:
567 yes = entry->sport == op[1].no;
568 break;
569 case INET_DIAG_BC_S_GE:
570 yes = entry->sport >= op[1].no;
571 break;
572 case INET_DIAG_BC_S_LE:
573 yes = entry->sport <= op[1].no;
574 break;
575 case INET_DIAG_BC_D_EQ:
576 yes = entry->dport == op[1].no;
577 break;
578 case INET_DIAG_BC_D_GE:
579 yes = entry->dport >= op[1].no;
580 break;
581 case INET_DIAG_BC_D_LE:
582 yes = entry->dport <= op[1].no;
583 break;
584 case INET_DIAG_BC_AUTO:
585 yes = !(entry->userlocks & SOCK_BINDPORT_LOCK);
586 break;
587 case INET_DIAG_BC_S_COND:
588 case INET_DIAG_BC_D_COND: {
589 const struct inet_diag_hostcond *cond;
590 const __be32 *addr;
591
592 cond = (const struct inet_diag_hostcond *)(op + 1);
593 if (cond->port != -1 &&
594 cond->port != (op->code == INET_DIAG_BC_S_COND ?
595 entry->sport : entry->dport)) {
596 yes = 0;
597 break;
598 }
599
600 if (op->code == INET_DIAG_BC_S_COND)
601 addr = entry->saddr;
602 else
603 addr = entry->daddr;
604
605 if (cond->family != AF_UNSPEC &&
606 cond->family != entry->family) {
607 if (entry->family == AF_INET6 &&
608 cond->family == AF_INET) {
609 if (addr[0] == 0 && addr[1] == 0 &&
610 addr[2] == htonl(0xffff) &&
611 bitstring_match(addr + 3,
612 cond->addr,
613 cond->prefix_len))
614 break;
615 }
616 yes = 0;
617 break;
618 }
619
620 if (cond->prefix_len == 0)
621 break;
622 if (bitstring_match(addr, cond->addr,
623 cond->prefix_len))
624 break;
625 yes = 0;
626 break;
627 }
628 case INET_DIAG_BC_DEV_COND: {
629 u32 ifindex;
630
631 ifindex = *((const u32 *)(op + 1));
632 if (ifindex != entry->ifindex)
633 yes = 0;
634 break;
635 }
636 case INET_DIAG_BC_MARK_COND: {
637 struct inet_diag_markcond *cond;
638
639 cond = (struct inet_diag_markcond *)(op + 1);
640 if ((entry->mark & cond->mask) != cond->mark)
641 yes = 0;
642 break;
643 }
644 }
645
646 if (yes) {
647 len -= op->yes;
648 bc += op->yes;
649 } else {
650 len -= op->no;
651 bc += op->no;
652 }
653 }
654 return len == 0;
655}
656
657/* This helper is available for all sockets (ESTABLISH, TIMEWAIT, SYN_RECV)
658 */
659static void entry_fill_addrs(struct inet_diag_entry *entry,
660 const struct sock *sk)
661{
662#if IS_ENABLED(CONFIG_IPV6)
663 if (sk->sk_family == AF_INET6) {
664 entry->saddr = sk->sk_v6_rcv_saddr.s6_addr32;
665 entry->daddr = sk->sk_v6_daddr.s6_addr32;
666 } else
667#endif
668 {
669 entry->saddr = &sk->sk_rcv_saddr;
670 entry->daddr = &sk->sk_daddr;
671 }
672}
673
674int inet_diag_bc_sk(const struct nlattr *bc, struct sock *sk)
675{
676 struct inet_sock *inet = inet_sk(sk);
677 struct inet_diag_entry entry;
678
679 if (!bc)
680 return 1;
681
682 entry.family = sk->sk_family;
683 entry_fill_addrs(&entry, sk);
684 entry.sport = inet->inet_num;
685 entry.dport = ntohs(inet->inet_dport);
686 entry.ifindex = sk->sk_bound_dev_if;
687 entry.userlocks = sk_fullsock(sk) ? sk->sk_userlocks : 0;
688 if (sk_fullsock(sk))
689 entry.mark = sk->sk_mark;
690 else if (sk->sk_state == TCP_NEW_SYN_RECV)
691 entry.mark = inet_rsk(inet_reqsk(sk))->ir_mark;
692 else
693 entry.mark = 0;
694
695 return inet_diag_bc_run(bc, &entry);
696}
697EXPORT_SYMBOL_GPL(inet_diag_bc_sk);
698
699static int valid_cc(const void *bc, int len, int cc)
700{
701 while (len >= 0) {
702 const struct inet_diag_bc_op *op = bc;
703
704 if (cc > len)
705 return 0;
706 if (cc == len)
707 return 1;
708 if (op->yes < 4 || op->yes & 3)
709 return 0;
710 len -= op->yes;
711 bc += op->yes;
712 }
713 return 0;
714}
715
716/* data is u32 ifindex */
717static bool valid_devcond(const struct inet_diag_bc_op *op, int len,
718 int *min_len)
719{
720 /* Check ifindex space. */
721 *min_len += sizeof(u32);
722 if (len < *min_len)
723 return false;
724
725 return true;
726}
727/* Validate an inet_diag_hostcond. */
728static bool valid_hostcond(const struct inet_diag_bc_op *op, int len,
729 int *min_len)
730{
731 struct inet_diag_hostcond *cond;
732 int addr_len;
733
734 /* Check hostcond space. */
735 *min_len += sizeof(struct inet_diag_hostcond);
736 if (len < *min_len)
737 return false;
738 cond = (struct inet_diag_hostcond *)(op + 1);
739
740 /* Check address family and address length. */
741 switch (cond->family) {
742 case AF_UNSPEC:
743 addr_len = 0;
744 break;
745 case AF_INET:
746 addr_len = sizeof(struct in_addr);
747 break;
748 case AF_INET6:
749 addr_len = sizeof(struct in6_addr);
750 break;
751 default:
752 return false;
753 }
754 *min_len += addr_len;
755 if (len < *min_len)
756 return false;
757
758 /* Check prefix length (in bits) vs address length (in bytes). */
759 if (cond->prefix_len > 8 * addr_len)
760 return false;
761
762 return true;
763}
764
765/* Validate a port comparison operator. */
766static bool valid_port_comparison(const struct inet_diag_bc_op *op,
767 int len, int *min_len)
768{
769 /* Port comparisons put the port in a follow-on inet_diag_bc_op. */
770 *min_len += sizeof(struct inet_diag_bc_op);
771 if (len < *min_len)
772 return false;
773 return true;
774}
775
776static bool valid_markcond(const struct inet_diag_bc_op *op, int len,
777 int *min_len)
778{
779 *min_len += sizeof(struct inet_diag_markcond);
780 return len >= *min_len;
781}
782
783static int inet_diag_bc_audit(const struct nlattr *attr,
784 const struct sk_buff *skb)
785{
786 bool net_admin = netlink_net_capable(skb, CAP_NET_ADMIN);
787 const void *bytecode, *bc;
788 int bytecode_len, len;
789
790 if (!attr || nla_len(attr) < sizeof(struct inet_diag_bc_op))
791 return -EINVAL;
792
793 bytecode = bc = nla_data(attr);
794 len = bytecode_len = nla_len(attr);
795
796 while (len > 0) {
797 int min_len = sizeof(struct inet_diag_bc_op);
798 const struct inet_diag_bc_op *op = bc;
799
800 switch (op->code) {
801 case INET_DIAG_BC_S_COND:
802 case INET_DIAG_BC_D_COND:
803 if (!valid_hostcond(bc, len, &min_len))
804 return -EINVAL;
805 break;
806 case INET_DIAG_BC_DEV_COND:
807 if (!valid_devcond(bc, len, &min_len))
808 return -EINVAL;
809 break;
810 case INET_DIAG_BC_S_EQ:
811 case INET_DIAG_BC_S_GE:
812 case INET_DIAG_BC_S_LE:
813 case INET_DIAG_BC_D_EQ:
814 case INET_DIAG_BC_D_GE:
815 case INET_DIAG_BC_D_LE:
816 if (!valid_port_comparison(bc, len, &min_len))
817 return -EINVAL;
818 break;
819 case INET_DIAG_BC_MARK_COND:
820 if (!net_admin)
821 return -EPERM;
822 if (!valid_markcond(bc, len, &min_len))
823 return -EINVAL;
824 break;
825 case INET_DIAG_BC_AUTO:
826 case INET_DIAG_BC_JMP:
827 case INET_DIAG_BC_NOP:
828 break;
829 default:
830 return -EINVAL;
831 }
832
833 if (op->code != INET_DIAG_BC_NOP) {
834 if (op->no < min_len || op->no > len + 4 || op->no & 3)
835 return -EINVAL;
836 if (op->no < len &&
837 !valid_cc(bytecode, bytecode_len, len - op->no))
838 return -EINVAL;
839 }
840
841 if (op->yes < min_len || op->yes > len + 4 || op->yes & 3)
842 return -EINVAL;
843 bc += op->yes;
844 len -= op->yes;
845 }
846 return len == 0 ? 0 : -EINVAL;
847}
848
849static int inet_csk_diag_dump(struct sock *sk,
850 struct sk_buff *skb,
851 struct netlink_callback *cb,
852 const struct inet_diag_req_v2 *r,
853 const struct nlattr *bc,
854 bool net_admin)
855{
856 if (!inet_diag_bc_sk(bc, sk))
857 return 0;
858
859 return inet_csk_diag_fill(sk, skb, r,
860 sk_user_ns(NETLINK_CB(cb->skb).sk),
861 NETLINK_CB(cb->skb).portid,
862 cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh,
863 net_admin);
864}
865
866static void twsk_build_assert(void)
867{
868 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_family) !=
869 offsetof(struct sock, sk_family));
870
871 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_num) !=
872 offsetof(struct inet_sock, inet_num));
873
874 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_dport) !=
875 offsetof(struct inet_sock, inet_dport));
876
877 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_rcv_saddr) !=
878 offsetof(struct inet_sock, inet_rcv_saddr));
879
880 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_daddr) !=
881 offsetof(struct inet_sock, inet_daddr));
882
883#if IS_ENABLED(CONFIG_IPV6)
884 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_v6_rcv_saddr) !=
885 offsetof(struct sock, sk_v6_rcv_saddr));
886
887 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_v6_daddr) !=
888 offsetof(struct sock, sk_v6_daddr));
889#endif
890}
891
892void inet_diag_dump_icsk(struct inet_hashinfo *hashinfo, struct sk_buff *skb,
893 struct netlink_callback *cb,
894 const struct inet_diag_req_v2 *r, struct nlattr *bc)
895{
896 bool net_admin = netlink_net_capable(cb->skb, CAP_NET_ADMIN);
897 struct net *net = sock_net(skb->sk);
898 u32 idiag_states = r->idiag_states;
899 int i, num, s_i, s_num;
900 struct sock *sk;
901
902 if (idiag_states & TCPF_SYN_RECV)
903 idiag_states |= TCPF_NEW_SYN_RECV;
904 s_i = cb->args[1];
905 s_num = num = cb->args[2];
906
907 if (cb->args[0] == 0) {
908 if (!(idiag_states & TCPF_LISTEN) || r->id.idiag_dport)
909 goto skip_listen_ht;
910
911 for (i = s_i; i < INET_LHTABLE_SIZE; i++) {
912 struct inet_listen_hashbucket *ilb;
913
914 num = 0;
915 ilb = &hashinfo->listening_hash[i];
916 spin_lock(&ilb->lock);
917 sk_for_each(sk, &ilb->head) {
918 struct inet_sock *inet = inet_sk(sk);
919
920 if (!net_eq(sock_net(sk), net))
921 continue;
922
923 if (num < s_num) {
924 num++;
925 continue;
926 }
927
928 if (r->sdiag_family != AF_UNSPEC &&
929 sk->sk_family != r->sdiag_family)
930 goto next_listen;
931
932 if (r->id.idiag_sport != inet->inet_sport &&
933 r->id.idiag_sport)
934 goto next_listen;
935
936 if (inet_csk_diag_dump(sk, skb, cb, r,
937 bc, net_admin) < 0) {
938 spin_unlock(&ilb->lock);
939 goto done;
940 }
941
942next_listen:
943 ++num;
944 }
945 spin_unlock(&ilb->lock);
946
947 s_num = 0;
948 }
949skip_listen_ht:
950 cb->args[0] = 1;
951 s_i = num = s_num = 0;
952 }
953
954 if (!(idiag_states & ~TCPF_LISTEN))
955 goto out;
956
957#define SKARR_SZ 16
958 for (i = s_i; i <= hashinfo->ehash_mask; i++) {
959 struct inet_ehash_bucket *head = &hashinfo->ehash[i];
960 spinlock_t *lock = inet_ehash_lockp(hashinfo, i);
961 struct hlist_nulls_node *node;
962 struct sock *sk_arr[SKARR_SZ];
963 int num_arr[SKARR_SZ];
964 int idx, accum, res;
965
966 if (hlist_nulls_empty(&head->chain))
967 continue;
968
969 if (i > s_i)
970 s_num = 0;
971
972next_chunk:
973 num = 0;
974 accum = 0;
975 spin_lock_bh(lock);
976 sk_nulls_for_each(sk, node, &head->chain) {
977 int state;
978
979 if (!net_eq(sock_net(sk), net))
980 continue;
981 if (num < s_num)
982 goto next_normal;
983 state = (sk->sk_state == TCP_TIME_WAIT) ?
984 inet_twsk(sk)->tw_substate : sk->sk_state;
985 if (!(idiag_states & (1 << state)))
986 goto next_normal;
987 if (r->sdiag_family != AF_UNSPEC &&
988 sk->sk_family != r->sdiag_family)
989 goto next_normal;
990 if (r->id.idiag_sport != htons(sk->sk_num) &&
991 r->id.idiag_sport)
992 goto next_normal;
993 if (r->id.idiag_dport != sk->sk_dport &&
994 r->id.idiag_dport)
995 goto next_normal;
996 twsk_build_assert();
997
998 if (!inet_diag_bc_sk(bc, sk))
999 goto next_normal;
1000
1001 sock_hold(sk);
1002 num_arr[accum] = num;
1003 sk_arr[accum] = sk;
1004 if (++accum == SKARR_SZ)
1005 break;
1006next_normal:
1007 ++num;
1008 }
1009 spin_unlock_bh(lock);
1010 res = 0;
1011 for (idx = 0; idx < accum; idx++) {
1012 if (res >= 0) {
1013 res = sk_diag_fill(sk_arr[idx], skb, r,
1014 sk_user_ns(NETLINK_CB(cb->skb).sk),
1015 NETLINK_CB(cb->skb).portid,
1016 cb->nlh->nlmsg_seq, NLM_F_MULTI,
1017 cb->nlh, net_admin);
1018 if (res < 0)
1019 num = num_arr[idx];
1020 }
1021 sock_gen_put(sk_arr[idx]);
1022 }
1023 if (res < 0)
1024 break;
1025 cond_resched();
1026 if (accum == SKARR_SZ) {
1027 s_num = num + 1;
1028 goto next_chunk;
1029 }
1030 }
1031
1032done:
1033 cb->args[1] = i;
1034 cb->args[2] = num;
1035out:
1036 ;
1037}
1038EXPORT_SYMBOL_GPL(inet_diag_dump_icsk);
1039
1040static int __inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb,
1041 const struct inet_diag_req_v2 *r,
1042 struct nlattr *bc)
1043{
1044 const struct inet_diag_handler *handler;
1045 int err = 0;
1046
1047 handler = inet_diag_lock_handler(r->sdiag_protocol);
1048 if (!IS_ERR(handler))
1049 handler->dump(skb, cb, r, bc);
1050 else
1051 err = PTR_ERR(handler);
1052 inet_diag_unlock_handler(handler);
1053
1054 return err ? : skb->len;
1055}
1056
1057static int inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb)
1058{
1059 int hdrlen = sizeof(struct inet_diag_req_v2);
1060 struct nlattr *bc = NULL;
1061
1062 if (nlmsg_attrlen(cb->nlh, hdrlen))
1063 bc = nlmsg_find_attr(cb->nlh, hdrlen, INET_DIAG_REQ_BYTECODE);
1064
1065 return __inet_diag_dump(skb, cb, nlmsg_data(cb->nlh), bc);
1066}
1067
1068static int inet_diag_type2proto(int type)
1069{
1070 switch (type) {
1071 case TCPDIAG_GETSOCK:
1072 return IPPROTO_TCP;
1073 case DCCPDIAG_GETSOCK:
1074 return IPPROTO_DCCP;
1075 default:
1076 return 0;
1077 }
1078}
1079
1080static int inet_diag_dump_compat(struct sk_buff *skb,
1081 struct netlink_callback *cb)
1082{
1083 struct inet_diag_req *rc = nlmsg_data(cb->nlh);
1084 int hdrlen = sizeof(struct inet_diag_req);
1085 struct inet_diag_req_v2 req;
1086 struct nlattr *bc = NULL;
1087
1088 req.sdiag_family = AF_UNSPEC; /* compatibility */
1089 req.sdiag_protocol = inet_diag_type2proto(cb->nlh->nlmsg_type);
1090 req.idiag_ext = rc->idiag_ext;
1091 req.idiag_states = rc->idiag_states;
1092 req.id = rc->id;
1093
1094 if (nlmsg_attrlen(cb->nlh, hdrlen))
1095 bc = nlmsg_find_attr(cb->nlh, hdrlen, INET_DIAG_REQ_BYTECODE);
1096
1097 return __inet_diag_dump(skb, cb, &req, bc);
1098}
1099
1100static int inet_diag_get_exact_compat(struct sk_buff *in_skb,
1101 const struct nlmsghdr *nlh)
1102{
1103 struct inet_diag_req *rc = nlmsg_data(nlh);
1104 struct inet_diag_req_v2 req;
1105
1106 req.sdiag_family = rc->idiag_family;
1107 req.sdiag_protocol = inet_diag_type2proto(nlh->nlmsg_type);
1108 req.idiag_ext = rc->idiag_ext;
1109 req.idiag_states = rc->idiag_states;
1110 req.id = rc->id;
1111
1112 return inet_diag_cmd_exact(SOCK_DIAG_BY_FAMILY, in_skb, nlh, &req);
1113}
1114
1115static int inet_diag_rcv_msg_compat(struct sk_buff *skb, struct nlmsghdr *nlh)
1116{
1117 int hdrlen = sizeof(struct inet_diag_req);
1118 struct net *net = sock_net(skb->sk);
1119
1120 if (nlh->nlmsg_type >= INET_DIAG_GETSOCK_MAX ||
1121 nlmsg_len(nlh) < hdrlen)
1122 return -EINVAL;
1123
1124 if (nlh->nlmsg_flags & NLM_F_DUMP) {
1125 if (nlmsg_attrlen(nlh, hdrlen)) {
1126 struct nlattr *attr;
1127 int err;
1128
1129 attr = nlmsg_find_attr(nlh, hdrlen,
1130 INET_DIAG_REQ_BYTECODE);
1131 err = inet_diag_bc_audit(attr, skb);
1132 if (err)
1133 return err;
1134 }
1135 {
1136 struct netlink_dump_control c = {
1137 .dump = inet_diag_dump_compat,
1138 };
1139 return netlink_dump_start(net->diag_nlsk, skb, nlh, &c);
1140 }
1141 }
1142
1143 return inet_diag_get_exact_compat(skb, nlh);
1144}
1145
1146static int inet_diag_handler_cmd(struct sk_buff *skb, struct nlmsghdr *h)
1147{
1148 int hdrlen = sizeof(struct inet_diag_req_v2);
1149 struct net *net = sock_net(skb->sk);
1150
1151 if (nlmsg_len(h) < hdrlen)
1152 return -EINVAL;
1153
1154 if (h->nlmsg_type == SOCK_DIAG_BY_FAMILY &&
1155 h->nlmsg_flags & NLM_F_DUMP) {
1156 if (nlmsg_attrlen(h, hdrlen)) {
1157 struct nlattr *attr;
1158 int err;
1159
1160 attr = nlmsg_find_attr(h, hdrlen,
1161 INET_DIAG_REQ_BYTECODE);
1162 err = inet_diag_bc_audit(attr, skb);
1163 if (err)
1164 return err;
1165 }
1166 {
1167 struct netlink_dump_control c = {
1168 .dump = inet_diag_dump,
1169 };
1170 return netlink_dump_start(net->diag_nlsk, skb, h, &c);
1171 }
1172 }
1173
1174 return inet_diag_cmd_exact(h->nlmsg_type, skb, h, nlmsg_data(h));
1175}
1176
1177static
1178int inet_diag_handler_get_info(struct sk_buff *skb, struct sock *sk)
1179{
1180 const struct inet_diag_handler *handler;
1181 struct nlmsghdr *nlh;
1182 struct nlattr *attr;
1183 struct inet_diag_msg *r;
1184 void *info = NULL;
1185 int err = 0;
1186
1187 nlh = nlmsg_put(skb, 0, 0, SOCK_DIAG_BY_FAMILY, sizeof(*r), 0);
1188 if (!nlh)
1189 return -ENOMEM;
1190
1191 r = nlmsg_data(nlh);
1192 memset(r, 0, sizeof(*r));
1193 inet_diag_msg_common_fill(r, sk);
1194 if (sk->sk_type == SOCK_DGRAM || sk->sk_type == SOCK_STREAM)
1195 r->id.idiag_sport = inet_sk(sk)->inet_sport;
1196 r->idiag_state = sk->sk_state;
1197
1198 if ((err = nla_put_u8(skb, INET_DIAG_PROTOCOL, sk->sk_protocol))) {
1199 nlmsg_cancel(skb, nlh);
1200 return err;
1201 }
1202
1203 handler = inet_diag_lock_handler(sk->sk_protocol);
1204 if (IS_ERR(handler)) {
1205 inet_diag_unlock_handler(handler);
1206 nlmsg_cancel(skb, nlh);
1207 return PTR_ERR(handler);
1208 }
1209
1210 attr = handler->idiag_info_size
1211 ? nla_reserve_64bit(skb, INET_DIAG_INFO,
1212 handler->idiag_info_size,
1213 INET_DIAG_PAD)
1214 : NULL;
1215 if (attr)
1216 info = nla_data(attr);
1217
1218 handler->idiag_get_info(sk, r, info);
1219 inet_diag_unlock_handler(handler);
1220
1221 nlmsg_end(skb, nlh);
1222 return 0;
1223}
1224
1225static const struct sock_diag_handler inet_diag_handler = {
1226 .family = AF_INET,
1227 .dump = inet_diag_handler_cmd,
1228 .get_info = inet_diag_handler_get_info,
1229 .destroy = inet_diag_handler_cmd,
1230};
1231
1232static const struct sock_diag_handler inet6_diag_handler = {
1233 .family = AF_INET6,
1234 .dump = inet_diag_handler_cmd,
1235 .get_info = inet_diag_handler_get_info,
1236 .destroy = inet_diag_handler_cmd,
1237};
1238
1239int inet_diag_register(const struct inet_diag_handler *h)
1240{
1241 const __u16 type = h->idiag_type;
1242 int err = -EINVAL;
1243
1244 if (type >= IPPROTO_MAX)
1245 goto out;
1246
1247 mutex_lock(&inet_diag_table_mutex);
1248 err = -EEXIST;
1249 if (!inet_diag_table[type]) {
1250 inet_diag_table[type] = h;
1251 err = 0;
1252 }
1253 mutex_unlock(&inet_diag_table_mutex);
1254out:
1255 return err;
1256}
1257EXPORT_SYMBOL_GPL(inet_diag_register);
1258
1259void inet_diag_unregister(const struct inet_diag_handler *h)
1260{
1261 const __u16 type = h->idiag_type;
1262
1263 if (type >= IPPROTO_MAX)
1264 return;
1265
1266 mutex_lock(&inet_diag_table_mutex);
1267 inet_diag_table[type] = NULL;
1268 mutex_unlock(&inet_diag_table_mutex);
1269}
1270EXPORT_SYMBOL_GPL(inet_diag_unregister);
1271
1272static int __init inet_diag_init(void)
1273{
1274 const int inet_diag_table_size = (IPPROTO_MAX *
1275 sizeof(struct inet_diag_handler *));
1276 int err = -ENOMEM;
1277
1278 inet_diag_table = kzalloc(inet_diag_table_size, GFP_KERNEL);
1279 if (!inet_diag_table)
1280 goto out;
1281
1282 err = sock_diag_register(&inet_diag_handler);
1283 if (err)
1284 goto out_free_nl;
1285
1286 err = sock_diag_register(&inet6_diag_handler);
1287 if (err)
1288 goto out_free_inet;
1289
1290 sock_diag_register_inet_compat(inet_diag_rcv_msg_compat);
1291out:
1292 return err;
1293
1294out_free_inet:
1295 sock_diag_unregister(&inet_diag_handler);
1296out_free_nl:
1297 kfree(inet_diag_table);
1298 goto out;
1299}
1300
1301static void __exit inet_diag_exit(void)
1302{
1303 sock_diag_unregister(&inet6_diag_handler);
1304 sock_diag_unregister(&inet_diag_handler);
1305 sock_diag_unregister_inet_compat(inet_diag_rcv_msg_compat);
1306 kfree(inet_diag_table);
1307}
1308
1309module_init(inet_diag_init);
1310module_exit(inet_diag_exit);
1311MODULE_LICENSE("GPL");
1312MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 2 /* AF_INET */);
1313MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 10 /* AF_INET6 */);