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io_uring: ensure finish_wait() is always called in __io_uring_task_cancel()
[linux/fpc-iii.git] / net / ipv4 / inet_diag.c
blob93474b1bea4e002e4fc2aefc3d311b0445961cf7
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 nlmsg_cancel(skb, nlh);
484 return -EMSGSIZE;
485 }
486
487 nlmsg_end(skb, nlh);
488 return 0;
489 }
490
491 static int sk_diag_fill(struct sock *sk, struct sk_buff *skb,
492 struct netlink_callback *cb,
493 const struct inet_diag_req_v2 *r,
494 u16 nlmsg_flags, bool net_admin)
495 {
496 if (sk->sk_state == TCP_TIME_WAIT)
497 return inet_twsk_diag_fill(sk, skb, cb, nlmsg_flags);
498
499 if (sk->sk_state == TCP_NEW_SYN_RECV)
500 return inet_req_diag_fill(sk, skb, cb, nlmsg_flags, net_admin);
501
502 return inet_sk_diag_fill(sk, inet_csk(sk), skb, cb, r, nlmsg_flags,
503 net_admin);
504 }
505
506 struct sock *inet_diag_find_one_icsk(struct net *net,
507 struct inet_hashinfo *hashinfo,
508 const struct inet_diag_req_v2 *req)
509 {
510 struct sock *sk;
511
512 rcu_read_lock();
513 if (req->sdiag_family == AF_INET)
514 sk = inet_lookup(net, hashinfo, NULL, 0, req->id.idiag_dst[0],
515 req->id.idiag_dport, req->id.idiag_src[0],
516 req->id.idiag_sport, req->id.idiag_if);
517 #if IS_ENABLED(CONFIG_IPV6)
518 else if (req->sdiag_family == AF_INET6) {
519 if (ipv6_addr_v4mapped((struct in6_addr *)req->id.idiag_dst) &&
520 ipv6_addr_v4mapped((struct in6_addr *)req->id.idiag_src))
521 sk = inet_lookup(net, hashinfo, NULL, 0, req->id.idiag_dst[3],
522 req->id.idiag_dport, req->id.idiag_src[3],
523 req->id.idiag_sport, req->id.idiag_if);
524 else
525 sk = inet6_lookup(net, hashinfo, NULL, 0,
526 (struct in6_addr *)req->id.idiag_dst,
527 req->id.idiag_dport,
528 (struct in6_addr *)req->id.idiag_src,
529 req->id.idiag_sport,
530 req->id.idiag_if);
531 }
532 #endif
533 else {
534 rcu_read_unlock();
535 return ERR_PTR(-EINVAL);
536 }
537 rcu_read_unlock();
538 if (!sk)
539 return ERR_PTR(-ENOENT);
540
541 if (sock_diag_check_cookie(sk, req->id.idiag_cookie)) {
542 sock_gen_put(sk);
543 return ERR_PTR(-ENOENT);
544 }
545
546 return sk;
547 }
548 EXPORT_SYMBOL_GPL(inet_diag_find_one_icsk);
549
550 int inet_diag_dump_one_icsk(struct inet_hashinfo *hashinfo,
551 struct netlink_callback *cb,
552 const struct inet_diag_req_v2 *req)
553 {
554 struct sk_buff *in_skb = cb->skb;
555 bool net_admin = netlink_net_capable(in_skb, CAP_NET_ADMIN);
556 struct net *net = sock_net(in_skb->sk);
557 struct sk_buff *rep;
558 struct sock *sk;
559 int err;
560
561 sk = inet_diag_find_one_icsk(net, hashinfo, req);
562 if (IS_ERR(sk))
563 return PTR_ERR(sk);
564
565 rep = nlmsg_new(inet_sk_attr_size(sk, req, net_admin), GFP_KERNEL);
566 if (!rep) {
567 err = -ENOMEM;
568 goto out;
569 }
570
571 err = sk_diag_fill(sk, rep, cb, req, 0, net_admin);
572 if (err < 0) {
573 WARN_ON(err == -EMSGSIZE);
574 nlmsg_free(rep);
575 goto out;
576 }
577 err = netlink_unicast(net->diag_nlsk, rep, NETLINK_CB(in_skb).portid,
578 MSG_DONTWAIT);
579 if (err > 0)
580 err = 0;
581
582 out:
583 if (sk)
584 sock_gen_put(sk);
585
586 return err;
587 }
588 EXPORT_SYMBOL_GPL(inet_diag_dump_one_icsk);
589
590 static int inet_diag_cmd_exact(int cmd, struct sk_buff *in_skb,
591 const struct nlmsghdr *nlh,
592 int hdrlen,
593 const struct inet_diag_req_v2 *req)
594 {
595 const struct inet_diag_handler *handler;
596 struct inet_diag_dump_data dump_data;
597 int err, protocol;
598
599 memset(&dump_data, 0, sizeof(dump_data));
600 err = inet_diag_parse_attrs(nlh, hdrlen, dump_data.req_nlas);
601 if (err)
602 return err;
603
604 protocol = inet_diag_get_protocol(req, &dump_data);
605
606 handler = inet_diag_lock_handler(protocol);
607 if (IS_ERR(handler)) {
608 err = PTR_ERR(handler);
609 } else if (cmd == SOCK_DIAG_BY_FAMILY) {
610 struct netlink_callback cb = {
611 .nlh = nlh,
612 .skb = in_skb,
613 .data = &dump_data,
614 };
615 err = handler->dump_one(&cb, req);
616 } else if (cmd == SOCK_DESTROY && handler->destroy) {
617 err = handler->destroy(in_skb, req);
618 } else {
619 err = -EOPNOTSUPP;
620 }
621 inet_diag_unlock_handler(handler);
622
623 return err;
624 }
625
626 static int bitstring_match(const __be32 *a1, const __be32 *a2, int bits)
627 {
628 int words = bits >> 5;
629
630 bits &= 0x1f;
631
632 if (words) {
633 if (memcmp(a1, a2, words << 2))
634 return 0;
635 }
636 if (bits) {
637 __be32 w1, w2;
638 __be32 mask;
639
640 w1 = a1[words];
641 w2 = a2[words];
642
643 mask = htonl((0xffffffff) << (32 - bits));
644
645 if ((w1 ^ w2) & mask)
646 return 0;
647 }
648
649 return 1;
650 }
651
652 static int inet_diag_bc_run(const struct nlattr *_bc,
653 const struct inet_diag_entry *entry)
654 {
655 const void *bc = nla_data(_bc);
656 int len = nla_len(_bc);
657
658 while (len > 0) {
659 int yes = 1;
660 const struct inet_diag_bc_op *op = bc;
661
662 switch (op->code) {
663 case INET_DIAG_BC_NOP:
664 break;
665 case INET_DIAG_BC_JMP:
666 yes = 0;
667 break;
668 case INET_DIAG_BC_S_EQ:
669 yes = entry->sport == op[1].no;
670 break;
671 case INET_DIAG_BC_S_GE:
672 yes = entry->sport >= op[1].no;
673 break;
674 case INET_DIAG_BC_S_LE:
675 yes = entry->sport <= op[1].no;
676 break;
677 case INET_DIAG_BC_D_EQ:
678 yes = entry->dport == op[1].no;
679 break;
680 case INET_DIAG_BC_D_GE:
681 yes = entry->dport >= op[1].no;
682 break;
683 case INET_DIAG_BC_D_LE:
684 yes = entry->dport <= op[1].no;
685 break;
686 case INET_DIAG_BC_AUTO:
687 yes = !(entry->userlocks & SOCK_BINDPORT_LOCK);
688 break;
689 case INET_DIAG_BC_S_COND:
690 case INET_DIAG_BC_D_COND: {
691 const struct inet_diag_hostcond *cond;
692 const __be32 *addr;
693
694 cond = (const struct inet_diag_hostcond *)(op + 1);
695 if (cond->port != -1 &&
696 cond->port != (op->code == INET_DIAG_BC_S_COND ?
697 entry->sport : entry->dport)) {
698 yes = 0;
699 break;
700 }
701
702 if (op->code == INET_DIAG_BC_S_COND)
703 addr = entry->saddr;
704 else
705 addr = entry->daddr;
706
707 if (cond->family != AF_UNSPEC &&
708 cond->family != entry->family) {
709 if (entry->family == AF_INET6 &&
710 cond->family == AF_INET) {
711 if (addr[0] == 0 && addr[1] == 0 &&
712 addr[2] == htonl(0xffff) &&
713 bitstring_match(addr + 3,
714 cond->addr,
715 cond->prefix_len))
716 break;
717 }
718 yes = 0;
719 break;
720 }
721
722 if (cond->prefix_len == 0)
723 break;
724 if (bitstring_match(addr, cond->addr,
725 cond->prefix_len))
726 break;
727 yes = 0;
728 break;
729 }
730 case INET_DIAG_BC_DEV_COND: {
731 u32 ifindex;
732
733 ifindex = *((const u32 *)(op + 1));
734 if (ifindex != entry->ifindex)
735 yes = 0;
736 break;
737 }
738 case INET_DIAG_BC_MARK_COND: {
739 struct inet_diag_markcond *cond;
740
741 cond = (struct inet_diag_markcond *)(op + 1);
742 if ((entry->mark & cond->mask) != cond->mark)
743 yes = 0;
744 break;
745 }
746 #ifdef CONFIG_SOCK_CGROUP_DATA
747 case INET_DIAG_BC_CGROUP_COND: {
748 u64 cgroup_id;
749
750 cgroup_id = get_unaligned((const u64 *)(op + 1));
751 if (cgroup_id != entry->cgroup_id)
752 yes = 0;
753 break;
754 }
755 #endif
756 }
757
758 if (yes) {
759 len -= op->yes;
760 bc += op->yes;
761 } else {
762 len -= op->no;
763 bc += op->no;
764 }
765 }
766 return len == 0;
767 }
768
769 /* This helper is available for all sockets (ESTABLISH, TIMEWAIT, SYN_RECV)
770 */
771 static void entry_fill_addrs(struct inet_diag_entry *entry,
772 const struct sock *sk)
773 {
774 #if IS_ENABLED(CONFIG_IPV6)
775 if (sk->sk_family == AF_INET6) {
776 entry->saddr = sk->sk_v6_rcv_saddr.s6_addr32;
777 entry->daddr = sk->sk_v6_daddr.s6_addr32;
778 } else
779 #endif
780 {
781 entry->saddr = &sk->sk_rcv_saddr;
782 entry->daddr = &sk->sk_daddr;
783 }
784 }
785
786 int inet_diag_bc_sk(const struct nlattr *bc, struct sock *sk)
787 {
788 struct inet_sock *inet = inet_sk(sk);
789 struct inet_diag_entry entry;
790
791 if (!bc)
792 return 1;
793
794 entry.family = sk->sk_family;
795 entry_fill_addrs(&entry, sk);
796 entry.sport = inet->inet_num;
797 entry.dport = ntohs(inet->inet_dport);
798 entry.ifindex = sk->sk_bound_dev_if;
799 entry.userlocks = sk_fullsock(sk) ? sk->sk_userlocks : 0;
800 if (sk_fullsock(sk))
801 entry.mark = sk->sk_mark;
802 else if (sk->sk_state == TCP_NEW_SYN_RECV)
803 entry.mark = inet_rsk(inet_reqsk(sk))->ir_mark;
804 else
805 entry.mark = 0;
806 #ifdef CONFIG_SOCK_CGROUP_DATA
807 entry.cgroup_id = sk_fullsock(sk) ?
808 cgroup_id(sock_cgroup_ptr(&sk->sk_cgrp_data)) : 0;
809 #endif
810
811 return inet_diag_bc_run(bc, &entry);
812 }
813 EXPORT_SYMBOL_GPL(inet_diag_bc_sk);
814
815 static int valid_cc(const void *bc, int len, int cc)
816 {
817 while (len >= 0) {
818 const struct inet_diag_bc_op *op = bc;
819
820 if (cc > len)
821 return 0;
822 if (cc == len)
823 return 1;
824 if (op->yes < 4 || op->yes & 3)
825 return 0;
826 len -= op->yes;
827 bc += op->yes;
828 }
829 return 0;
830 }
831
832 /* data is u32 ifindex */
833 static bool valid_devcond(const struct inet_diag_bc_op *op, int len,
834 int *min_len)
835 {
836 /* Check ifindex space. */
837 *min_len += sizeof(u32);
838 if (len < *min_len)
839 return false;
840
841 return true;
842 }
843 /* Validate an inet_diag_hostcond. */
844 static bool valid_hostcond(const struct inet_diag_bc_op *op, int len,
845 int *min_len)
846 {
847 struct inet_diag_hostcond *cond;
848 int addr_len;
849
850 /* Check hostcond space. */
851 *min_len += sizeof(struct inet_diag_hostcond);
852 if (len < *min_len)
853 return false;
854 cond = (struct inet_diag_hostcond *)(op + 1);
855
856 /* Check address family and address length. */
857 switch (cond->family) {
858 case AF_UNSPEC:
859 addr_len = 0;
860 break;
861 case AF_INET:
862 addr_len = sizeof(struct in_addr);
863 break;
864 case AF_INET6:
865 addr_len = sizeof(struct in6_addr);
866 break;
867 default:
868 return false;
869 }
870 *min_len += addr_len;
871 if (len < *min_len)
872 return false;
873
874 /* Check prefix length (in bits) vs address length (in bytes). */
875 if (cond->prefix_len > 8 * addr_len)
876 return false;
877
878 return true;
879 }
880
881 /* Validate a port comparison operator. */
882 static bool valid_port_comparison(const struct inet_diag_bc_op *op,
883 int len, int *min_len)
884 {
885 /* Port comparisons put the port in a follow-on inet_diag_bc_op. */
886 *min_len += sizeof(struct inet_diag_bc_op);
887 if (len < *min_len)
888 return false;
889 return true;
890 }
891
892 static bool valid_markcond(const struct inet_diag_bc_op *op, int len,
893 int *min_len)
894 {
895 *min_len += sizeof(struct inet_diag_markcond);
896 return len >= *min_len;
897 }
898
899 #ifdef CONFIG_SOCK_CGROUP_DATA
900 static bool valid_cgroupcond(const struct inet_diag_bc_op *op, int len,
901 int *min_len)
902 {
903 *min_len += sizeof(u64);
904 return len >= *min_len;
905 }
906 #endif
907
908 static int inet_diag_bc_audit(const struct nlattr *attr,
909 const struct sk_buff *skb)
910 {
911 bool net_admin = netlink_net_capable(skb, CAP_NET_ADMIN);
912 const void *bytecode, *bc;
913 int bytecode_len, len;
914
915 if (!attr || nla_len(attr) < sizeof(struct inet_diag_bc_op))
916 return -EINVAL;
917
918 bytecode = bc = nla_data(attr);
919 len = bytecode_len = nla_len(attr);
920
921 while (len > 0) {
922 int min_len = sizeof(struct inet_diag_bc_op);
923 const struct inet_diag_bc_op *op = bc;
924
925 switch (op->code) {
926 case INET_DIAG_BC_S_COND:
927 case INET_DIAG_BC_D_COND:
928 if (!valid_hostcond(bc, len, &min_len))
929 return -EINVAL;
930 break;
931 case INET_DIAG_BC_DEV_COND:
932 if (!valid_devcond(bc, len, &min_len))
933 return -EINVAL;
934 break;
935 case INET_DIAG_BC_S_EQ:
936 case INET_DIAG_BC_S_GE:
937 case INET_DIAG_BC_S_LE:
938 case INET_DIAG_BC_D_EQ:
939 case INET_DIAG_BC_D_GE:
940 case INET_DIAG_BC_D_LE:
941 if (!valid_port_comparison(bc, len, &min_len))
942 return -EINVAL;
943 break;
944 case INET_DIAG_BC_MARK_COND:
945 if (!net_admin)
946 return -EPERM;
947 if (!valid_markcond(bc, len, &min_len))
948 return -EINVAL;
949 break;
950 #ifdef CONFIG_SOCK_CGROUP_DATA
951 case INET_DIAG_BC_CGROUP_COND:
952 if (!valid_cgroupcond(bc, len, &min_len))
953 return -EINVAL;
954 break;
955 #endif
956 case INET_DIAG_BC_AUTO:
957 case INET_DIAG_BC_JMP:
958 case INET_DIAG_BC_NOP:
959 break;
960 default:
961 return -EINVAL;
962 }
963
964 if (op->code != INET_DIAG_BC_NOP) {
965 if (op->no < min_len || op->no > len + 4 || op->no & 3)
966 return -EINVAL;
967 if (op->no < len &&
968 !valid_cc(bytecode, bytecode_len, len - op->no))
969 return -EINVAL;
970 }
971
972 if (op->yes < min_len || op->yes > len + 4 || op->yes & 3)
973 return -EINVAL;
974 bc += op->yes;
975 len -= op->yes;
976 }
977 return len == 0 ? 0 : -EINVAL;
978 }
979
980 static void twsk_build_assert(void)
981 {
982 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_family) !=
983 offsetof(struct sock, sk_family));
984
985 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_num) !=
986 offsetof(struct inet_sock, inet_num));
987
988 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_dport) !=
989 offsetof(struct inet_sock, inet_dport));
990
991 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_rcv_saddr) !=
992 offsetof(struct inet_sock, inet_rcv_saddr));
993
994 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_daddr) !=
995 offsetof(struct inet_sock, inet_daddr));
996
997 #if IS_ENABLED(CONFIG_IPV6)
998 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_v6_rcv_saddr) !=
999 offsetof(struct sock, sk_v6_rcv_saddr));
1000
1001 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_v6_daddr) !=
1002 offsetof(struct sock, sk_v6_daddr));
1003 #endif
1004 }
1005
1006 void inet_diag_dump_icsk(struct inet_hashinfo *hashinfo, struct sk_buff *skb,
1007 struct netlink_callback *cb,
1008 const struct inet_diag_req_v2 *r)
1009 {
1010 bool net_admin = netlink_net_capable(cb->skb, CAP_NET_ADMIN);
1011 struct inet_diag_dump_data *cb_data = cb->data;
1012 struct net *net = sock_net(skb->sk);
1013 u32 idiag_states = r->idiag_states;
1014 int i, num, s_i, s_num;
1015 struct nlattr *bc;
1016 struct sock *sk;
1017
1018 bc = cb_data->inet_diag_nla_bc;
1019 if (idiag_states & TCPF_SYN_RECV)
1020 idiag_states |= TCPF_NEW_SYN_RECV;
1021 s_i = cb->args[1];
1022 s_num = num = cb->args[2];
1023
1024 if (cb->args[0] == 0) {
1025 if (!(idiag_states & TCPF_LISTEN) || r->id.idiag_dport)
1026 goto skip_listen_ht;
1027
1028 for (i = s_i; i < INET_LHTABLE_SIZE; i++) {
1029 struct inet_listen_hashbucket *ilb;
1030 struct hlist_nulls_node *node;
1031
1032 num = 0;
1033 ilb = &hashinfo->listening_hash[i];
1034 spin_lock(&ilb->lock);
1035 sk_nulls_for_each(sk, node, &ilb->nulls_head) {
1036 struct inet_sock *inet = inet_sk(sk);
1037
1038 if (!net_eq(sock_net(sk), net))
1039 continue;
1040
1041 if (num < s_num) {
1042 num++;
1043 continue;
1044 }
1045
1046 if (r->sdiag_family != AF_UNSPEC &&
1047 sk->sk_family != r->sdiag_family)
1048 goto next_listen;
1049
1050 if (r->id.idiag_sport != inet->inet_sport &&
1051 r->id.idiag_sport)
1052 goto next_listen;
1053
1054 if (!inet_diag_bc_sk(bc, sk))
1055 goto next_listen;
1056
1057 if (inet_sk_diag_fill(sk, inet_csk(sk), skb,
1058 cb, r, NLM_F_MULTI,
1059 net_admin) < 0) {
1060 spin_unlock(&ilb->lock);
1061 goto done;
1062 }
1063
1064 next_listen:
1065 ++num;
1066 }
1067 spin_unlock(&ilb->lock);
1068
1069 s_num = 0;
1070 }
1071 skip_listen_ht:
1072 cb->args[0] = 1;
1073 s_i = num = s_num = 0;
1074 }
1075
1076 if (!(idiag_states & ~TCPF_LISTEN))
1077 goto out;
1078
1079 #define SKARR_SZ 16
1080 for (i = s_i; i <= hashinfo->ehash_mask; i++) {
1081 struct inet_ehash_bucket *head = &hashinfo->ehash[i];
1082 spinlock_t *lock = inet_ehash_lockp(hashinfo, i);
1083 struct hlist_nulls_node *node;
1084 struct sock *sk_arr[SKARR_SZ];
1085 int num_arr[SKARR_SZ];
1086 int idx, accum, res;
1087
1088 if (hlist_nulls_empty(&head->chain))
1089 continue;
1090
1091 if (i > s_i)
1092 s_num = 0;
1093
1094 next_chunk:
1095 num = 0;
1096 accum = 0;
1097 spin_lock_bh(lock);
1098 sk_nulls_for_each(sk, node, &head->chain) {
1099 int state;
1100
1101 if (!net_eq(sock_net(sk), net))
1102 continue;
1103 if (num < s_num)
1104 goto next_normal;
1105 state = (sk->sk_state == TCP_TIME_WAIT) ?
1106 inet_twsk(sk)->tw_substate : sk->sk_state;
1107 if (!(idiag_states & (1 << state)))
1108 goto next_normal;
1109 if (r->sdiag_family != AF_UNSPEC &&
1110 sk->sk_family != r->sdiag_family)
1111 goto next_normal;
1112 if (r->id.idiag_sport != htons(sk->sk_num) &&
1113 r->id.idiag_sport)
1114 goto next_normal;
1115 if (r->id.idiag_dport != sk->sk_dport &&
1116 r->id.idiag_dport)
1117 goto next_normal;
1118 twsk_build_assert();
1119
1120 if (!inet_diag_bc_sk(bc, sk))
1121 goto next_normal;
1122
1123 if (!refcount_inc_not_zero(&sk->sk_refcnt))
1124 goto next_normal;
1125
1126 num_arr[accum] = num;
1127 sk_arr[accum] = sk;
1128 if (++accum == SKARR_SZ)
1129 break;
1130 next_normal:
1131 ++num;
1132 }
1133 spin_unlock_bh(lock);
1134 res = 0;
1135 for (idx = 0; idx < accum; idx++) {
1136 if (res >= 0) {
1137 res = sk_diag_fill(sk_arr[idx], skb, cb, r,
1138 NLM_F_MULTI, net_admin);
1139 if (res < 0)
1140 num = num_arr[idx];
1141 }
1142 sock_gen_put(sk_arr[idx]);
1143 }
1144 if (res < 0)
1145 break;
1146 cond_resched();
1147 if (accum == SKARR_SZ) {
1148 s_num = num + 1;
1149 goto next_chunk;
1150 }
1151 }
1152
1153 done:
1154 cb->args[1] = i;
1155 cb->args[2] = num;
1156 out:
1157 ;
1158 }
1159 EXPORT_SYMBOL_GPL(inet_diag_dump_icsk);
1160
1161 static int __inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb,
1162 const struct inet_diag_req_v2 *r)
1163 {
1164 struct inet_diag_dump_data *cb_data = cb->data;
1165 const struct inet_diag_handler *handler;
1166 u32 prev_min_dump_alloc;
1167 int protocol, err = 0;
1168
1169 protocol = inet_diag_get_protocol(r, cb_data);
1170
1171 again:
1172 prev_min_dump_alloc = cb->min_dump_alloc;
1173 handler = inet_diag_lock_handler(protocol);
1174 if (!IS_ERR(handler))
1175 handler->dump(skb, cb, r);
1176 else
1177 err = PTR_ERR(handler);
1178 inet_diag_unlock_handler(handler);
1179
1180 /* The skb is not large enough to fit one sk info and
1181 * inet_sk_diag_fill() has requested for a larger skb.
1182 */
1183 if (!skb->len && cb->min_dump_alloc > prev_min_dump_alloc) {
1184 err = pskb_expand_head(skb, 0, cb->min_dump_alloc, GFP_KERNEL);
1185 if (!err)
1186 goto again;
1187 }
1188
1189 return err ? : skb->len;
1190 }
1191
1192 static int inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb)
1193 {
1194 return __inet_diag_dump(skb, cb, nlmsg_data(cb->nlh));
1195 }
1196
1197 static int __inet_diag_dump_start(struct netlink_callback *cb, int hdrlen)
1198 {
1199 const struct nlmsghdr *nlh = cb->nlh;
1200 struct inet_diag_dump_data *cb_data;
1201 struct sk_buff *skb = cb->skb;
1202 struct nlattr *nla;
1203 int err;
1204
1205 cb_data = kzalloc(sizeof(*cb_data), GFP_KERNEL);
1206 if (!cb_data)
1207 return -ENOMEM;
1208
1209 err = inet_diag_parse_attrs(nlh, hdrlen, cb_data->req_nlas);
1210 if (err) {
1211 kfree(cb_data);
1212 return err;
1213 }
1214 nla = cb_data->inet_diag_nla_bc;
1215 if (nla) {
1216 err = inet_diag_bc_audit(nla, skb);
1217 if (err) {
1218 kfree(cb_data);
1219 return err;
1220 }
1221 }
1222
1223 nla = cb_data->inet_diag_nla_bpf_stgs;
1224 if (nla) {
1225 struct bpf_sk_storage_diag *bpf_stg_diag;
1226
1227 bpf_stg_diag = bpf_sk_storage_diag_alloc(nla);
1228 if (IS_ERR(bpf_stg_diag)) {
1229 kfree(cb_data);
1230 return PTR_ERR(bpf_stg_diag);
1231 }
1232 cb_data->bpf_stg_diag = bpf_stg_diag;
1233 }
1234
1235 cb->data = cb_data;
1236 return 0;
1237 }
1238
1239 static int inet_diag_dump_start(struct netlink_callback *cb)
1240 {
1241 return __inet_diag_dump_start(cb, sizeof(struct inet_diag_req_v2));
1242 }
1243
1244 static int inet_diag_dump_start_compat(struct netlink_callback *cb)
1245 {
1246 return __inet_diag_dump_start(cb, sizeof(struct inet_diag_req));
1247 }
1248
1249 static int inet_diag_dump_done(struct netlink_callback *cb)
1250 {
1251 struct inet_diag_dump_data *cb_data = cb->data;
1252
1253 bpf_sk_storage_diag_free(cb_data->bpf_stg_diag);
1254 kfree(cb->data);
1255
1256 return 0;
1257 }
1258
1259 static int inet_diag_type2proto(int type)
1260 {
1261 switch (type) {
1262 case TCPDIAG_GETSOCK:
1263 return IPPROTO_TCP;
1264 case DCCPDIAG_GETSOCK:
1265 return IPPROTO_DCCP;
1266 default:
1267 return 0;
1268 }
1269 }
1270
1271 static int inet_diag_dump_compat(struct sk_buff *skb,
1272 struct netlink_callback *cb)
1273 {
1274 struct inet_diag_req *rc = nlmsg_data(cb->nlh);
1275 struct inet_diag_req_v2 req;
1276
1277 req.sdiag_family = AF_UNSPEC; /* compatibility */
1278 req.sdiag_protocol = inet_diag_type2proto(cb->nlh->nlmsg_type);
1279 req.idiag_ext = rc->idiag_ext;
1280 req.idiag_states = rc->idiag_states;
1281 req.id = rc->id;
1282
1283 return __inet_diag_dump(skb, cb, &req);
1284 }
1285
1286 static int inet_diag_get_exact_compat(struct sk_buff *in_skb,
1287 const struct nlmsghdr *nlh)
1288 {
1289 struct inet_diag_req *rc = nlmsg_data(nlh);
1290 struct inet_diag_req_v2 req;
1291
1292 req.sdiag_family = rc->idiag_family;
1293 req.sdiag_protocol = inet_diag_type2proto(nlh->nlmsg_type);
1294 req.idiag_ext = rc->idiag_ext;
1295 req.idiag_states = rc->idiag_states;
1296 req.id = rc->id;
1297
1298 return inet_diag_cmd_exact(SOCK_DIAG_BY_FAMILY, in_skb, nlh,
1299 sizeof(struct inet_diag_req), &req);
1300 }
1301
1302 static int inet_diag_rcv_msg_compat(struct sk_buff *skb, struct nlmsghdr *nlh)
1303 {
1304 int hdrlen = sizeof(struct inet_diag_req);
1305 struct net *net = sock_net(skb->sk);
1306
1307 if (nlh->nlmsg_type >= INET_DIAG_GETSOCK_MAX ||
1308 nlmsg_len(nlh) < hdrlen)
1309 return -EINVAL;
1310
1311 if (nlh->nlmsg_flags & NLM_F_DUMP) {
1312 struct netlink_dump_control c = {
1313 .start = inet_diag_dump_start_compat,
1314 .done = inet_diag_dump_done,
1315 .dump = inet_diag_dump_compat,
1316 };
1317 return netlink_dump_start(net->diag_nlsk, skb, nlh, &c);
1318 }
1319
1320 return inet_diag_get_exact_compat(skb, nlh);
1321 }
1322
1323 static int inet_diag_handler_cmd(struct sk_buff *skb, struct nlmsghdr *h)
1324 {
1325 int hdrlen = sizeof(struct inet_diag_req_v2);
1326 struct net *net = sock_net(skb->sk);
1327
1328 if (nlmsg_len(h) < hdrlen)
1329 return -EINVAL;
1330
1331 if (h->nlmsg_type == SOCK_DIAG_BY_FAMILY &&
1332 h->nlmsg_flags & NLM_F_DUMP) {
1333 struct netlink_dump_control c = {
1334 .start = inet_diag_dump_start,
1335 .done = inet_diag_dump_done,
1336 .dump = inet_diag_dump,
1337 };
1338 return netlink_dump_start(net->diag_nlsk, skb, h, &c);
1339 }
1340
1341 return inet_diag_cmd_exact(h->nlmsg_type, skb, h, hdrlen,
1342 nlmsg_data(h));
1343 }
1344
1345 static
1346 int inet_diag_handler_get_info(struct sk_buff *skb, struct sock *sk)
1347 {
1348 const struct inet_diag_handler *handler;
1349 struct nlmsghdr *nlh;
1350 struct nlattr *attr;
1351 struct inet_diag_msg *r;
1352 void *info = NULL;
1353 int err = 0;
1354
1355 nlh = nlmsg_put(skb, 0, 0, SOCK_DIAG_BY_FAMILY, sizeof(*r), 0);
1356 if (!nlh)
1357 return -ENOMEM;
1358
1359 r = nlmsg_data(nlh);
1360 memset(r, 0, sizeof(*r));
1361 inet_diag_msg_common_fill(r, sk);
1362 if (sk->sk_type == SOCK_DGRAM || sk->sk_type == SOCK_STREAM)
1363 r->id.idiag_sport = inet_sk(sk)->inet_sport;
1364 r->idiag_state = sk->sk_state;
1365
1366 if ((err = nla_put_u8(skb, INET_DIAG_PROTOCOL, sk->sk_protocol))) {
1367 nlmsg_cancel(skb, nlh);
1368 return err;
1369 }
1370
1371 handler = inet_diag_lock_handler(sk->sk_protocol);
1372 if (IS_ERR(handler)) {
1373 inet_diag_unlock_handler(handler);
1374 nlmsg_cancel(skb, nlh);
1375 return PTR_ERR(handler);
1376 }
1377
1378 attr = handler->idiag_info_size
1379 ? nla_reserve_64bit(skb, INET_DIAG_INFO,
1380 handler->idiag_info_size,
1381 INET_DIAG_PAD)
1382 : NULL;
1383 if (attr)
1384 info = nla_data(attr);
1385
1386 handler->idiag_get_info(sk, r, info);
1387 inet_diag_unlock_handler(handler);
1388
1389 nlmsg_end(skb, nlh);
1390 return 0;
1391 }
1392
1393 static const struct sock_diag_handler inet_diag_handler = {
1394 .family = AF_INET,
1395 .dump = inet_diag_handler_cmd,
1396 .get_info = inet_diag_handler_get_info,
1397 .destroy = inet_diag_handler_cmd,
1398 };
1399
1400 static const struct sock_diag_handler inet6_diag_handler = {
1401 .family = AF_INET6,
1402 .dump = inet_diag_handler_cmd,
1403 .get_info = inet_diag_handler_get_info,
1404 .destroy = inet_diag_handler_cmd,
1405 };
1406
1407 int inet_diag_register(const struct inet_diag_handler *h)
1408 {
1409 const __u16 type = h->idiag_type;
1410 int err = -EINVAL;
1411
1412 if (type >= IPPROTO_MAX)
1413 goto out;
1414
1415 mutex_lock(&inet_diag_table_mutex);
1416 err = -EEXIST;
1417 if (!inet_diag_table[type]) {
1418 inet_diag_table[type] = h;
1419 err = 0;
1420 }
1421 mutex_unlock(&inet_diag_table_mutex);
1422 out:
1423 return err;
1424 }
1425 EXPORT_SYMBOL_GPL(inet_diag_register);
1426
1427 void inet_diag_unregister(const struct inet_diag_handler *h)
1428 {
1429 const __u16 type = h->idiag_type;
1430
1431 if (type >= IPPROTO_MAX)
1432 return;
1433
1434 mutex_lock(&inet_diag_table_mutex);
1435 inet_diag_table[type] = NULL;
1436 mutex_unlock(&inet_diag_table_mutex);
1437 }
1438 EXPORT_SYMBOL_GPL(inet_diag_unregister);
1439
1440 static int __init inet_diag_init(void)
1441 {
1442 const int inet_diag_table_size = (IPPROTO_MAX *
1443 sizeof(struct inet_diag_handler *));
1444 int err = -ENOMEM;
1445
1446 inet_diag_table = kzalloc(inet_diag_table_size, GFP_KERNEL);
1447 if (!inet_diag_table)
1448 goto out;
1449
1450 err = sock_diag_register(&inet_diag_handler);
1451 if (err)
1452 goto out_free_nl;
1453
1454 err = sock_diag_register(&inet6_diag_handler);
1455 if (err)
1456 goto out_free_inet;
1457
1458 sock_diag_register_inet_compat(inet_diag_rcv_msg_compat);
1459 out:
1460 return err;
1461
1462 out_free_inet:
1463 sock_diag_unregister(&inet_diag_handler);
1464 out_free_nl:
1465 kfree(inet_diag_table);
1466 goto out;
1467 }
1468
1469 static void __exit inet_diag_exit(void)
1470 {
1471 sock_diag_unregister(&inet6_diag_handler);
1472 sock_diag_unregister(&inet_diag_handler);
1473 sock_diag_unregister_inet_compat(inet_diag_rcv_msg_compat);
1474 kfree(inet_diag_table);
1475 }
1476
1477 module_init(inet_diag_init);
1478 module_exit(inet_diag_exit);
1479 MODULE_LICENSE("GPL");
1480 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 2 /* AF_INET */);
1481 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 10 /* AF_INET6 */);
Linux with added FPC-III support