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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
134
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
164
165
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
288
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
365
366
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
394
395
396 goto errout;
397
398 WARN_ON_ONCE(total_nla_size <= prev_min_dump_alloc);
399
400
401
402
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
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
838static bool valid_devcond(const struct inet_diag_bc_op *op, int len,
839 int *min_len)
840{
841
842 *min_len += sizeof(u32);
843 if (len < *min_len)
844 return false;
845
846 return true;
847}
848
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
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
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
880 if (cond->prefix_len > 8 * addr_len)
881 return false;
882
883 return true;
884}
885
886
887static bool valid_port_comparison(const struct inet_diag_bc_op *op,
888 int len, int *min_len)
889{
890
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
1186
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;
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 );
1486MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 10
1487
