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[media] omap3isp: Replace cpu_is_omap3630() with ISP revision check
[deliverable/linux.git] / net / ipv4 / inet_diag.c
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
38 static const struct inet_diag_handler **inet_diag_table;
39
40 struct inet_diag_entry {
41 __be32 *saddr;
42 __be32 *daddr;
43 u16 sport;
44 u16 dport;
45 u16 family;
46 u16 userlocks;
47 };
48
49 static DEFINE_MUTEX(inet_diag_table_mutex);
50
51 static const struct inet_diag_handler *inet_diag_lock_handler(int proto)
52 {
53 if (!inet_diag_table[proto])
54 request_module("net-pf-%d-proto-%d-type-%d-%d", PF_NETLINK,
55 NETLINK_SOCK_DIAG, AF_INET, proto);
56
57 mutex_lock(&inet_diag_table_mutex);
58 if (!inet_diag_table[proto])
59 return ERR_PTR(-ENOENT);
60
61 return inet_diag_table[proto];
62 }
63
64 static inline void inet_diag_unlock_handler(
65 const struct inet_diag_handler *handler)
66 {
67 mutex_unlock(&inet_diag_table_mutex);
68 }
69
70 int inet_sk_diag_fill(struct sock *sk, struct inet_connection_sock *icsk,
71 struct sk_buff *skb, struct inet_diag_req_v2 *req,
72 struct user_namespace *user_ns,
73 u32 portid, u32 seq, u16 nlmsg_flags,
74 const struct nlmsghdr *unlh)
75 {
76 const struct inet_sock *inet = inet_sk(sk);
77 struct inet_diag_msg *r;
78 struct nlmsghdr *nlh;
79 struct nlattr *attr;
80 void *info = NULL;
81 const struct inet_diag_handler *handler;
82 int ext = req->idiag_ext;
83
84 handler = inet_diag_table[req->sdiag_protocol];
85 BUG_ON(handler == NULL);
86
87 nlh = nlmsg_put(skb, portid, seq, unlh->nlmsg_type, sizeof(*r),
88 nlmsg_flags);
89 if (!nlh)
90 return -EMSGSIZE;
91
92 r = nlmsg_data(nlh);
93 BUG_ON(sk->sk_state == TCP_TIME_WAIT);
94
95 r->idiag_family = sk->sk_family;
96 r->idiag_state = sk->sk_state;
97 r->idiag_timer = 0;
98 r->idiag_retrans = 0;
99
100 r->id.idiag_if = sk->sk_bound_dev_if;
101 sock_diag_save_cookie(sk, r->id.idiag_cookie);
102
103 r->id.idiag_sport = inet->inet_sport;
104 r->id.idiag_dport = inet->inet_dport;
105 r->id.idiag_src[0] = inet->inet_rcv_saddr;
106 r->id.idiag_dst[0] = inet->inet_daddr;
107
108 /* IPv6 dual-stack sockets use inet->tos for IPv4 connections,
109 * hence this needs to be included regardless of socket family.
110 */
111 if (ext & (1 << (INET_DIAG_TOS - 1)))
112 if (nla_put_u8(skb, INET_DIAG_TOS, inet->tos) < 0)
113 goto errout;
114
115 #if IS_ENABLED(CONFIG_IPV6)
116 if (r->idiag_family == AF_INET6) {
117 const struct ipv6_pinfo *np = inet6_sk(sk);
118
119 *(struct in6_addr *)r->id.idiag_src = np->rcv_saddr;
120 *(struct in6_addr *)r->id.idiag_dst = np->daddr;
121
122 if (ext & (1 << (INET_DIAG_TCLASS - 1)))
123 if (nla_put_u8(skb, INET_DIAG_TCLASS, np->tclass) < 0)
124 goto errout;
125 }
126 #endif
127
128 r->idiag_uid = from_kuid_munged(user_ns, sock_i_uid(sk));
129 r->idiag_inode = sock_i_ino(sk);
130
131 if (ext & (1 << (INET_DIAG_MEMINFO - 1))) {
132 struct inet_diag_meminfo minfo = {
133 .idiag_rmem = sk_rmem_alloc_get(sk),
134 .idiag_wmem = sk->sk_wmem_queued,
135 .idiag_fmem = sk->sk_forward_alloc,
136 .idiag_tmem = sk_wmem_alloc_get(sk),
137 };
138
139 if (nla_put(skb, INET_DIAG_MEMINFO, sizeof(minfo), &minfo) < 0)
140 goto errout;
141 }
142
143 if (ext & (1 << (INET_DIAG_SKMEMINFO - 1)))
144 if (sock_diag_put_meminfo(sk, skb, INET_DIAG_SKMEMINFO))
145 goto errout;
146
147 if (icsk == NULL) {
148 handler->idiag_get_info(sk, r, NULL);
149 goto out;
150 }
151
152 #define EXPIRES_IN_MS(tmo) DIV_ROUND_UP((tmo - jiffies) * 1000, HZ)
153
154 if (icsk->icsk_pending == ICSK_TIME_RETRANS) {
155 r->idiag_timer = 1;
156 r->idiag_retrans = icsk->icsk_retransmits;
157 r->idiag_expires = EXPIRES_IN_MS(icsk->icsk_timeout);
158 } else if (icsk->icsk_pending == ICSK_TIME_PROBE0) {
159 r->idiag_timer = 4;
160 r->idiag_retrans = icsk->icsk_probes_out;
161 r->idiag_expires = EXPIRES_IN_MS(icsk->icsk_timeout);
162 } else if (timer_pending(&sk->sk_timer)) {
163 r->idiag_timer = 2;
164 r->idiag_retrans = icsk->icsk_probes_out;
165 r->idiag_expires = EXPIRES_IN_MS(sk->sk_timer.expires);
166 } else {
167 r->idiag_timer = 0;
168 r->idiag_expires = 0;
169 }
170 #undef EXPIRES_IN_MS
171
172 if (ext & (1 << (INET_DIAG_INFO - 1))) {
173 attr = nla_reserve(skb, INET_DIAG_INFO,
174 sizeof(struct tcp_info));
175 if (!attr)
176 goto errout;
177
178 info = nla_data(attr);
179 }
180
181 if ((ext & (1 << (INET_DIAG_CONG - 1))) && icsk->icsk_ca_ops)
182 if (nla_put_string(skb, INET_DIAG_CONG,
183 icsk->icsk_ca_ops->name) < 0)
184 goto errout;
185
186 handler->idiag_get_info(sk, r, info);
187
188 if (sk->sk_state < TCP_TIME_WAIT &&
189 icsk->icsk_ca_ops && icsk->icsk_ca_ops->get_info)
190 icsk->icsk_ca_ops->get_info(sk, ext, skb);
191
192 out:
193 return nlmsg_end(skb, nlh);
194
195 errout:
196 nlmsg_cancel(skb, nlh);
197 return -EMSGSIZE;
198 }
199 EXPORT_SYMBOL_GPL(inet_sk_diag_fill);
200
201 static int inet_csk_diag_fill(struct sock *sk,
202 struct sk_buff *skb, struct inet_diag_req_v2 *req,
203 struct user_namespace *user_ns,
204 u32 portid, u32 seq, u16 nlmsg_flags,
205 const struct nlmsghdr *unlh)
206 {
207 return inet_sk_diag_fill(sk, inet_csk(sk),
208 skb, req, user_ns, portid, seq, nlmsg_flags, unlh);
209 }
210
211 static int inet_twsk_diag_fill(struct inet_timewait_sock *tw,
212 struct sk_buff *skb, struct inet_diag_req_v2 *req,
213 u32 portid, u32 seq, u16 nlmsg_flags,
214 const struct nlmsghdr *unlh)
215 {
216 long tmo;
217 struct inet_diag_msg *r;
218 struct nlmsghdr *nlh;
219
220 nlh = nlmsg_put(skb, portid, seq, unlh->nlmsg_type, sizeof(*r),
221 nlmsg_flags);
222 if (!nlh)
223 return -EMSGSIZE;
224
225 r = nlmsg_data(nlh);
226 BUG_ON(tw->tw_state != TCP_TIME_WAIT);
227
228 tmo = tw->tw_ttd - jiffies;
229 if (tmo < 0)
230 tmo = 0;
231
232 r->idiag_family = tw->tw_family;
233 r->idiag_retrans = 0;
234 r->id.idiag_if = tw->tw_bound_dev_if;
235 sock_diag_save_cookie(tw, r->id.idiag_cookie);
236 r->id.idiag_sport = tw->tw_sport;
237 r->id.idiag_dport = tw->tw_dport;
238 r->id.idiag_src[0] = tw->tw_rcv_saddr;
239 r->id.idiag_dst[0] = tw->tw_daddr;
240 r->idiag_state = tw->tw_substate;
241 r->idiag_timer = 3;
242 r->idiag_expires = DIV_ROUND_UP(tmo * 1000, HZ);
243 r->idiag_rqueue = 0;
244 r->idiag_wqueue = 0;
245 r->idiag_uid = 0;
246 r->idiag_inode = 0;
247 #if IS_ENABLED(CONFIG_IPV6)
248 if (tw->tw_family == AF_INET6) {
249 const struct inet6_timewait_sock *tw6 =
250 inet6_twsk((struct sock *)tw);
251
252 *(struct in6_addr *)r->id.idiag_src = tw6->tw_v6_rcv_saddr;
253 *(struct in6_addr *)r->id.idiag_dst = tw6->tw_v6_daddr;
254 }
255 #endif
256
257 return nlmsg_end(skb, nlh);
258 }
259
260 static int sk_diag_fill(struct sock *sk, struct sk_buff *skb,
261 struct inet_diag_req_v2 *r,
262 struct user_namespace *user_ns,
263 u32 portid, u32 seq, u16 nlmsg_flags,
264 const struct nlmsghdr *unlh)
265 {
266 if (sk->sk_state == TCP_TIME_WAIT)
267 return inet_twsk_diag_fill((struct inet_timewait_sock *)sk,
268 skb, r, portid, seq, nlmsg_flags,
269 unlh);
270 return inet_csk_diag_fill(sk, skb, r, user_ns, portid, seq, nlmsg_flags, unlh);
271 }
272
273 int inet_diag_dump_one_icsk(struct inet_hashinfo *hashinfo, struct sk_buff *in_skb,
274 const struct nlmsghdr *nlh, struct inet_diag_req_v2 *req)
275 {
276 int err;
277 struct sock *sk;
278 struct sk_buff *rep;
279 struct net *net = sock_net(in_skb->sk);
280
281 err = -EINVAL;
282 if (req->sdiag_family == AF_INET) {
283 sk = inet_lookup(net, hashinfo, req->id.idiag_dst[0],
284 req->id.idiag_dport, req->id.idiag_src[0],
285 req->id.idiag_sport, req->id.idiag_if);
286 }
287 #if IS_ENABLED(CONFIG_IPV6)
288 else if (req->sdiag_family == AF_INET6) {
289 sk = inet6_lookup(net, hashinfo,
290 (struct in6_addr *)req->id.idiag_dst,
291 req->id.idiag_dport,
292 (struct in6_addr *)req->id.idiag_src,
293 req->id.idiag_sport,
294 req->id.idiag_if);
295 }
296 #endif
297 else {
298 goto out_nosk;
299 }
300
301 err = -ENOENT;
302 if (sk == NULL)
303 goto out_nosk;
304
305 err = sock_diag_check_cookie(sk, req->id.idiag_cookie);
306 if (err)
307 goto out;
308
309 rep = nlmsg_new(sizeof(struct inet_diag_msg) +
310 sizeof(struct inet_diag_meminfo) +
311 sizeof(struct tcp_info) + 64, GFP_KERNEL);
312 if (!rep) {
313 err = -ENOMEM;
314 goto out;
315 }
316
317 err = sk_diag_fill(sk, rep, req,
318 sk_user_ns(NETLINK_CB(in_skb).ssk),
319 NETLINK_CB(in_skb).portid,
320 nlh->nlmsg_seq, 0, nlh);
321 if (err < 0) {
322 WARN_ON(err == -EMSGSIZE);
323 nlmsg_free(rep);
324 goto out;
325 }
326 err = netlink_unicast(net->diag_nlsk, rep, NETLINK_CB(in_skb).portid,
327 MSG_DONTWAIT);
328 if (err > 0)
329 err = 0;
330
331 out:
332 if (sk) {
333 if (sk->sk_state == TCP_TIME_WAIT)
334 inet_twsk_put((struct inet_timewait_sock *)sk);
335 else
336 sock_put(sk);
337 }
338 out_nosk:
339 return err;
340 }
341 EXPORT_SYMBOL_GPL(inet_diag_dump_one_icsk);
342
343 static int inet_diag_get_exact(struct sk_buff *in_skb,
344 const struct nlmsghdr *nlh,
345 struct inet_diag_req_v2 *req)
346 {
347 const struct inet_diag_handler *handler;
348 int err;
349
350 handler = inet_diag_lock_handler(req->sdiag_protocol);
351 if (IS_ERR(handler))
352 err = PTR_ERR(handler);
353 else
354 err = handler->dump_one(in_skb, nlh, req);
355 inet_diag_unlock_handler(handler);
356
357 return err;
358 }
359
360 static int bitstring_match(const __be32 *a1, const __be32 *a2, int bits)
361 {
362 int words = bits >> 5;
363
364 bits &= 0x1f;
365
366 if (words) {
367 if (memcmp(a1, a2, words << 2))
368 return 0;
369 }
370 if (bits) {
371 __be32 w1, w2;
372 __be32 mask;
373
374 w1 = a1[words];
375 w2 = a2[words];
376
377 mask = htonl((0xffffffff) << (32 - bits));
378
379 if ((w1 ^ w2) & mask)
380 return 0;
381 }
382
383 return 1;
384 }
385
386
387 static int inet_diag_bc_run(const struct nlattr *_bc,
388 const struct inet_diag_entry *entry)
389 {
390 const void *bc = nla_data(_bc);
391 int len = nla_len(_bc);
392
393 while (len > 0) {
394 int yes = 1;
395 const struct inet_diag_bc_op *op = bc;
396
397 switch (op->code) {
398 case INET_DIAG_BC_NOP:
399 break;
400 case INET_DIAG_BC_JMP:
401 yes = 0;
402 break;
403 case INET_DIAG_BC_S_GE:
404 yes = entry->sport >= op[1].no;
405 break;
406 case INET_DIAG_BC_S_LE:
407 yes = entry->sport <= op[1].no;
408 break;
409 case INET_DIAG_BC_D_GE:
410 yes = entry->dport >= op[1].no;
411 break;
412 case INET_DIAG_BC_D_LE:
413 yes = entry->dport <= op[1].no;
414 break;
415 case INET_DIAG_BC_AUTO:
416 yes = !(entry->userlocks & SOCK_BINDPORT_LOCK);
417 break;
418 case INET_DIAG_BC_S_COND:
419 case INET_DIAG_BC_D_COND: {
420 struct inet_diag_hostcond *cond;
421 __be32 *addr;
422
423 cond = (struct inet_diag_hostcond *)(op + 1);
424 if (cond->port != -1 &&
425 cond->port != (op->code == INET_DIAG_BC_S_COND ?
426 entry->sport : entry->dport)) {
427 yes = 0;
428 break;
429 }
430
431 if (cond->prefix_len == 0)
432 break;
433
434 if (op->code == INET_DIAG_BC_S_COND)
435 addr = entry->saddr;
436 else
437 addr = entry->daddr;
438
439 if (bitstring_match(addr, cond->addr,
440 cond->prefix_len))
441 break;
442 if (entry->family == AF_INET6 &&
443 cond->family == AF_INET) {
444 if (addr[0] == 0 && addr[1] == 0 &&
445 addr[2] == htonl(0xffff) &&
446 bitstring_match(addr + 3, cond->addr,
447 cond->prefix_len))
448 break;
449 }
450 yes = 0;
451 break;
452 }
453 }
454
455 if (yes) {
456 len -= op->yes;
457 bc += op->yes;
458 } else {
459 len -= op->no;
460 bc += op->no;
461 }
462 }
463 return len == 0;
464 }
465
466 int inet_diag_bc_sk(const struct nlattr *bc, struct sock *sk)
467 {
468 struct inet_diag_entry entry;
469 struct inet_sock *inet = inet_sk(sk);
470
471 if (bc == NULL)
472 return 1;
473
474 entry.family = sk->sk_family;
475 #if IS_ENABLED(CONFIG_IPV6)
476 if (entry.family == AF_INET6) {
477 struct ipv6_pinfo *np = inet6_sk(sk);
478
479 entry.saddr = np->rcv_saddr.s6_addr32;
480 entry.daddr = np->daddr.s6_addr32;
481 } else
482 #endif
483 {
484 entry.saddr = &inet->inet_rcv_saddr;
485 entry.daddr = &inet->inet_daddr;
486 }
487 entry.sport = inet->inet_num;
488 entry.dport = ntohs(inet->inet_dport);
489 entry.userlocks = sk->sk_userlocks;
490
491 return inet_diag_bc_run(bc, &entry);
492 }
493 EXPORT_SYMBOL_GPL(inet_diag_bc_sk);
494
495 static int valid_cc(const void *bc, int len, int cc)
496 {
497 while (len >= 0) {
498 const struct inet_diag_bc_op *op = bc;
499
500 if (cc > len)
501 return 0;
502 if (cc == len)
503 return 1;
504 if (op->yes < 4 || op->yes & 3)
505 return 0;
506 len -= op->yes;
507 bc += op->yes;
508 }
509 return 0;
510 }
511
512 static int inet_diag_bc_audit(const void *bytecode, int bytecode_len)
513 {
514 const void *bc = bytecode;
515 int len = bytecode_len;
516
517 while (len > 0) {
518 const struct inet_diag_bc_op *op = bc;
519
520 //printk("BC: %d %d %d {%d} / %d\n", op->code, op->yes, op->no, op[1].no, len);
521 switch (op->code) {
522 case INET_DIAG_BC_AUTO:
523 case INET_DIAG_BC_S_COND:
524 case INET_DIAG_BC_D_COND:
525 case INET_DIAG_BC_S_GE:
526 case INET_DIAG_BC_S_LE:
527 case INET_DIAG_BC_D_GE:
528 case INET_DIAG_BC_D_LE:
529 case INET_DIAG_BC_JMP:
530 if (op->no < 4 || op->no > len + 4 || op->no & 3)
531 return -EINVAL;
532 if (op->no < len &&
533 !valid_cc(bytecode, bytecode_len, len - op->no))
534 return -EINVAL;
535 break;
536 case INET_DIAG_BC_NOP:
537 break;
538 default:
539 return -EINVAL;
540 }
541 if (op->yes < 4 || op->yes > len + 4 || op->yes & 3)
542 return -EINVAL;
543 bc += op->yes;
544 len -= op->yes;
545 }
546 return len == 0 ? 0 : -EINVAL;
547 }
548
549 static int inet_csk_diag_dump(struct sock *sk,
550 struct sk_buff *skb,
551 struct netlink_callback *cb,
552 struct inet_diag_req_v2 *r,
553 const struct nlattr *bc)
554 {
555 if (!inet_diag_bc_sk(bc, sk))
556 return 0;
557
558 return inet_csk_diag_fill(sk, skb, r,
559 sk_user_ns(NETLINK_CB(cb->skb).ssk),
560 NETLINK_CB(cb->skb).portid,
561 cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh);
562 }
563
564 static int inet_twsk_diag_dump(struct inet_timewait_sock *tw,
565 struct sk_buff *skb,
566 struct netlink_callback *cb,
567 struct inet_diag_req_v2 *r,
568 const struct nlattr *bc)
569 {
570 if (bc != NULL) {
571 struct inet_diag_entry entry;
572
573 entry.family = tw->tw_family;
574 #if IS_ENABLED(CONFIG_IPV6)
575 if (tw->tw_family == AF_INET6) {
576 struct inet6_timewait_sock *tw6 =
577 inet6_twsk((struct sock *)tw);
578 entry.saddr = tw6->tw_v6_rcv_saddr.s6_addr32;
579 entry.daddr = tw6->tw_v6_daddr.s6_addr32;
580 } else
581 #endif
582 {
583 entry.saddr = &tw->tw_rcv_saddr;
584 entry.daddr = &tw->tw_daddr;
585 }
586 entry.sport = tw->tw_num;
587 entry.dport = ntohs(tw->tw_dport);
588 entry.userlocks = 0;
589
590 if (!inet_diag_bc_run(bc, &entry))
591 return 0;
592 }
593
594 return inet_twsk_diag_fill(tw, skb, r,
595 NETLINK_CB(cb->skb).portid,
596 cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh);
597 }
598
599 static int inet_diag_fill_req(struct sk_buff *skb, struct sock *sk,
600 struct request_sock *req,
601 struct user_namespace *user_ns,
602 u32 portid, u32 seq,
603 const struct nlmsghdr *unlh)
604 {
605 const struct inet_request_sock *ireq = inet_rsk(req);
606 struct inet_sock *inet = inet_sk(sk);
607 struct inet_diag_msg *r;
608 struct nlmsghdr *nlh;
609 long tmo;
610
611 nlh = nlmsg_put(skb, portid, seq, unlh->nlmsg_type, sizeof(*r),
612 NLM_F_MULTI);
613 if (!nlh)
614 return -EMSGSIZE;
615
616 r = nlmsg_data(nlh);
617 r->idiag_family = sk->sk_family;
618 r->idiag_state = TCP_SYN_RECV;
619 r->idiag_timer = 1;
620 r->idiag_retrans = req->retrans;
621
622 r->id.idiag_if = sk->sk_bound_dev_if;
623 sock_diag_save_cookie(req, r->id.idiag_cookie);
624
625 tmo = req->expires - jiffies;
626 if (tmo < 0)
627 tmo = 0;
628
629 r->id.idiag_sport = inet->inet_sport;
630 r->id.idiag_dport = ireq->rmt_port;
631 r->id.idiag_src[0] = ireq->loc_addr;
632 r->id.idiag_dst[0] = ireq->rmt_addr;
633 r->idiag_expires = jiffies_to_msecs(tmo);
634 r->idiag_rqueue = 0;
635 r->idiag_wqueue = 0;
636 r->idiag_uid = from_kuid_munged(user_ns, sock_i_uid(sk));
637 r->idiag_inode = 0;
638 #if IS_ENABLED(CONFIG_IPV6)
639 if (r->idiag_family == AF_INET6) {
640 *(struct in6_addr *)r->id.idiag_src = inet6_rsk(req)->loc_addr;
641 *(struct in6_addr *)r->id.idiag_dst = inet6_rsk(req)->rmt_addr;
642 }
643 #endif
644
645 return nlmsg_end(skb, nlh);
646 }
647
648 static int inet_diag_dump_reqs(struct sk_buff *skb, struct sock *sk,
649 struct netlink_callback *cb,
650 struct inet_diag_req_v2 *r,
651 const struct nlattr *bc)
652 {
653 struct inet_diag_entry entry;
654 struct inet_connection_sock *icsk = inet_csk(sk);
655 struct listen_sock *lopt;
656 struct inet_sock *inet = inet_sk(sk);
657 int j, s_j;
658 int reqnum, s_reqnum;
659 int err = 0;
660
661 s_j = cb->args[3];
662 s_reqnum = cb->args[4];
663
664 if (s_j > 0)
665 s_j--;
666
667 entry.family = sk->sk_family;
668
669 read_lock_bh(&icsk->icsk_accept_queue.syn_wait_lock);
670
671 lopt = icsk->icsk_accept_queue.listen_opt;
672 if (!lopt || !lopt->qlen)
673 goto out;
674
675 if (bc != NULL) {
676 entry.sport = inet->inet_num;
677 entry.userlocks = sk->sk_userlocks;
678 }
679
680 for (j = s_j; j < lopt->nr_table_entries; j++) {
681 struct request_sock *req, *head = lopt->syn_table[j];
682
683 reqnum = 0;
684 for (req = head; req; reqnum++, req = req->dl_next) {
685 struct inet_request_sock *ireq = inet_rsk(req);
686
687 if (reqnum < s_reqnum)
688 continue;
689 if (r->id.idiag_dport != ireq->rmt_port &&
690 r->id.idiag_dport)
691 continue;
692
693 if (bc) {
694 entry.saddr =
695 #if IS_ENABLED(CONFIG_IPV6)
696 (entry.family == AF_INET6) ?
697 inet6_rsk(req)->loc_addr.s6_addr32 :
698 #endif
699 &ireq->loc_addr;
700 entry.daddr =
701 #if IS_ENABLED(CONFIG_IPV6)
702 (entry.family == AF_INET6) ?
703 inet6_rsk(req)->rmt_addr.s6_addr32 :
704 #endif
705 &ireq->rmt_addr;
706 entry.dport = ntohs(ireq->rmt_port);
707
708 if (!inet_diag_bc_run(bc, &entry))
709 continue;
710 }
711
712 err = inet_diag_fill_req(skb, sk, req,
713 sk_user_ns(NETLINK_CB(cb->skb).ssk),
714 NETLINK_CB(cb->skb).portid,
715 cb->nlh->nlmsg_seq, cb->nlh);
716 if (err < 0) {
717 cb->args[3] = j + 1;
718 cb->args[4] = reqnum;
719 goto out;
720 }
721 }
722
723 s_reqnum = 0;
724 }
725
726 out:
727 read_unlock_bh(&icsk->icsk_accept_queue.syn_wait_lock);
728
729 return err;
730 }
731
732 void inet_diag_dump_icsk(struct inet_hashinfo *hashinfo, struct sk_buff *skb,
733 struct netlink_callback *cb, struct inet_diag_req_v2 *r, struct nlattr *bc)
734 {
735 int i, num;
736 int s_i, s_num;
737 struct net *net = sock_net(skb->sk);
738
739 s_i = cb->args[1];
740 s_num = num = cb->args[2];
741
742 if (cb->args[0] == 0) {
743 if (!(r->idiag_states & (TCPF_LISTEN | TCPF_SYN_RECV)))
744 goto skip_listen_ht;
745
746 for (i = s_i; i < INET_LHTABLE_SIZE; i++) {
747 struct sock *sk;
748 struct hlist_nulls_node *node;
749 struct inet_listen_hashbucket *ilb;
750
751 num = 0;
752 ilb = &hashinfo->listening_hash[i];
753 spin_lock_bh(&ilb->lock);
754 sk_nulls_for_each(sk, node, &ilb->head) {
755 struct inet_sock *inet = inet_sk(sk);
756
757 if (!net_eq(sock_net(sk), net))
758 continue;
759
760 if (num < s_num) {
761 num++;
762 continue;
763 }
764
765 if (r->sdiag_family != AF_UNSPEC &&
766 sk->sk_family != r->sdiag_family)
767 goto next_listen;
768
769 if (r->id.idiag_sport != inet->inet_sport &&
770 r->id.idiag_sport)
771 goto next_listen;
772
773 if (!(r->idiag_states & TCPF_LISTEN) ||
774 r->id.idiag_dport ||
775 cb->args[3] > 0)
776 goto syn_recv;
777
778 if (inet_csk_diag_dump(sk, skb, cb, r, bc) < 0) {
779 spin_unlock_bh(&ilb->lock);
780 goto done;
781 }
782
783 syn_recv:
784 if (!(r->idiag_states & TCPF_SYN_RECV))
785 goto next_listen;
786
787 if (inet_diag_dump_reqs(skb, sk, cb, r, bc) < 0) {
788 spin_unlock_bh(&ilb->lock);
789 goto done;
790 }
791
792 next_listen:
793 cb->args[3] = 0;
794 cb->args[4] = 0;
795 ++num;
796 }
797 spin_unlock_bh(&ilb->lock);
798
799 s_num = 0;
800 cb->args[3] = 0;
801 cb->args[4] = 0;
802 }
803 skip_listen_ht:
804 cb->args[0] = 1;
805 s_i = num = s_num = 0;
806 }
807
808 if (!(r->idiag_states & ~(TCPF_LISTEN | TCPF_SYN_RECV)))
809 goto out;
810
811 for (i = s_i; i <= hashinfo->ehash_mask; i++) {
812 struct inet_ehash_bucket *head = &hashinfo->ehash[i];
813 spinlock_t *lock = inet_ehash_lockp(hashinfo, i);
814 struct sock *sk;
815 struct hlist_nulls_node *node;
816
817 num = 0;
818
819 if (hlist_nulls_empty(&head->chain) &&
820 hlist_nulls_empty(&head->twchain))
821 continue;
822
823 if (i > s_i)
824 s_num = 0;
825
826 spin_lock_bh(lock);
827 sk_nulls_for_each(sk, node, &head->chain) {
828 struct inet_sock *inet = inet_sk(sk);
829
830 if (!net_eq(sock_net(sk), net))
831 continue;
832 if (num < s_num)
833 goto next_normal;
834 if (!(r->idiag_states & (1 << sk->sk_state)))
835 goto next_normal;
836 if (r->sdiag_family != AF_UNSPEC &&
837 sk->sk_family != r->sdiag_family)
838 goto next_normal;
839 if (r->id.idiag_sport != inet->inet_sport &&
840 r->id.idiag_sport)
841 goto next_normal;
842 if (r->id.idiag_dport != inet->inet_dport &&
843 r->id.idiag_dport)
844 goto next_normal;
845 if (inet_csk_diag_dump(sk, skb, cb, r, bc) < 0) {
846 spin_unlock_bh(lock);
847 goto done;
848 }
849 next_normal:
850 ++num;
851 }
852
853 if (r->idiag_states & TCPF_TIME_WAIT) {
854 struct inet_timewait_sock *tw;
855
856 inet_twsk_for_each(tw, node,
857 &head->twchain) {
858 if (!net_eq(twsk_net(tw), net))
859 continue;
860
861 if (num < s_num)
862 goto next_dying;
863 if (r->sdiag_family != AF_UNSPEC &&
864 tw->tw_family != r->sdiag_family)
865 goto next_dying;
866 if (r->id.idiag_sport != tw->tw_sport &&
867 r->id.idiag_sport)
868 goto next_dying;
869 if (r->id.idiag_dport != tw->tw_dport &&
870 r->id.idiag_dport)
871 goto next_dying;
872 if (inet_twsk_diag_dump(tw, skb, cb, r, bc) < 0) {
873 spin_unlock_bh(lock);
874 goto done;
875 }
876 next_dying:
877 ++num;
878 }
879 }
880 spin_unlock_bh(lock);
881 }
882
883 done:
884 cb->args[1] = i;
885 cb->args[2] = num;
886 out:
887 ;
888 }
889 EXPORT_SYMBOL_GPL(inet_diag_dump_icsk);
890
891 static int __inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb,
892 struct inet_diag_req_v2 *r, struct nlattr *bc)
893 {
894 const struct inet_diag_handler *handler;
895 int err = 0;
896
897 handler = inet_diag_lock_handler(r->sdiag_protocol);
898 if (!IS_ERR(handler))
899 handler->dump(skb, cb, r, bc);
900 else
901 err = PTR_ERR(handler);
902 inet_diag_unlock_handler(handler);
903
904 return err ? : skb->len;
905 }
906
907 static int inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb)
908 {
909 struct nlattr *bc = NULL;
910 int hdrlen = sizeof(struct inet_diag_req_v2);
911
912 if (nlmsg_attrlen(cb->nlh, hdrlen))
913 bc = nlmsg_find_attr(cb->nlh, hdrlen, INET_DIAG_REQ_BYTECODE);
914
915 return __inet_diag_dump(skb, cb, nlmsg_data(cb->nlh), bc);
916 }
917
918 static inline int inet_diag_type2proto(int type)
919 {
920 switch (type) {
921 case TCPDIAG_GETSOCK:
922 return IPPROTO_TCP;
923 case DCCPDIAG_GETSOCK:
924 return IPPROTO_DCCP;
925 default:
926 return 0;
927 }
928 }
929
930 static int inet_diag_dump_compat(struct sk_buff *skb, struct netlink_callback *cb)
931 {
932 struct inet_diag_req *rc = nlmsg_data(cb->nlh);
933 struct inet_diag_req_v2 req;
934 struct nlattr *bc = NULL;
935 int hdrlen = sizeof(struct inet_diag_req);
936
937 req.sdiag_family = AF_UNSPEC; /* compatibility */
938 req.sdiag_protocol = inet_diag_type2proto(cb->nlh->nlmsg_type);
939 req.idiag_ext = rc->idiag_ext;
940 req.idiag_states = rc->idiag_states;
941 req.id = rc->id;
942
943 if (nlmsg_attrlen(cb->nlh, hdrlen))
944 bc = nlmsg_find_attr(cb->nlh, hdrlen, INET_DIAG_REQ_BYTECODE);
945
946 return __inet_diag_dump(skb, cb, &req, bc);
947 }
948
949 static int inet_diag_get_exact_compat(struct sk_buff *in_skb,
950 const struct nlmsghdr *nlh)
951 {
952 struct inet_diag_req *rc = nlmsg_data(nlh);
953 struct inet_diag_req_v2 req;
954
955 req.sdiag_family = rc->idiag_family;
956 req.sdiag_protocol = inet_diag_type2proto(nlh->nlmsg_type);
957 req.idiag_ext = rc->idiag_ext;
958 req.idiag_states = rc->idiag_states;
959 req.id = rc->id;
960
961 return inet_diag_get_exact(in_skb, nlh, &req);
962 }
963
964 static int inet_diag_rcv_msg_compat(struct sk_buff *skb, struct nlmsghdr *nlh)
965 {
966 int hdrlen = sizeof(struct inet_diag_req);
967 struct net *net = sock_net(skb->sk);
968
969 if (nlh->nlmsg_type >= INET_DIAG_GETSOCK_MAX ||
970 nlmsg_len(nlh) < hdrlen)
971 return -EINVAL;
972
973 if (nlh->nlmsg_flags & NLM_F_DUMP) {
974 if (nlmsg_attrlen(nlh, hdrlen)) {
975 struct nlattr *attr;
976
977 attr = nlmsg_find_attr(nlh, hdrlen,
978 INET_DIAG_REQ_BYTECODE);
979 if (attr == NULL ||
980 nla_len(attr) < sizeof(struct inet_diag_bc_op) ||
981 inet_diag_bc_audit(nla_data(attr), nla_len(attr)))
982 return -EINVAL;
983 }
984 {
985 struct netlink_dump_control c = {
986 .dump = inet_diag_dump_compat,
987 };
988 return netlink_dump_start(net->diag_nlsk, skb, nlh, &c);
989 }
990 }
991
992 return inet_diag_get_exact_compat(skb, nlh);
993 }
994
995 static int inet_diag_handler_dump(struct sk_buff *skb, struct nlmsghdr *h)
996 {
997 int hdrlen = sizeof(struct inet_diag_req_v2);
998 struct net *net = sock_net(skb->sk);
999
1000 if (nlmsg_len(h) < hdrlen)
1001 return -EINVAL;
1002
1003 if (h->nlmsg_flags & NLM_F_DUMP) {
1004 if (nlmsg_attrlen(h, hdrlen)) {
1005 struct nlattr *attr;
1006 attr = nlmsg_find_attr(h, hdrlen,
1007 INET_DIAG_REQ_BYTECODE);
1008 if (attr == NULL ||
1009 nla_len(attr) < sizeof(struct inet_diag_bc_op) ||
1010 inet_diag_bc_audit(nla_data(attr), nla_len(attr)))
1011 return -EINVAL;
1012 }
1013 {
1014 struct netlink_dump_control c = {
1015 .dump = inet_diag_dump,
1016 };
1017 return netlink_dump_start(net->diag_nlsk, skb, h, &c);
1018 }
1019 }
1020
1021 return inet_diag_get_exact(skb, h, nlmsg_data(h));
1022 }
1023
1024 static const struct sock_diag_handler inet_diag_handler = {
1025 .family = AF_INET,
1026 .dump = inet_diag_handler_dump,
1027 };
1028
1029 static const struct sock_diag_handler inet6_diag_handler = {
1030 .family = AF_INET6,
1031 .dump = inet_diag_handler_dump,
1032 };
1033
1034 int inet_diag_register(const struct inet_diag_handler *h)
1035 {
1036 const __u16 type = h->idiag_type;
1037 int err = -EINVAL;
1038
1039 if (type >= IPPROTO_MAX)
1040 goto out;
1041
1042 mutex_lock(&inet_diag_table_mutex);
1043 err = -EEXIST;
1044 if (inet_diag_table[type] == NULL) {
1045 inet_diag_table[type] = h;
1046 err = 0;
1047 }
1048 mutex_unlock(&inet_diag_table_mutex);
1049 out:
1050 return err;
1051 }
1052 EXPORT_SYMBOL_GPL(inet_diag_register);
1053
1054 void inet_diag_unregister(const struct inet_diag_handler *h)
1055 {
1056 const __u16 type = h->idiag_type;
1057
1058 if (type >= IPPROTO_MAX)
1059 return;
1060
1061 mutex_lock(&inet_diag_table_mutex);
1062 inet_diag_table[type] = NULL;
1063 mutex_unlock(&inet_diag_table_mutex);
1064 }
1065 EXPORT_SYMBOL_GPL(inet_diag_unregister);
1066
1067 static int __init inet_diag_init(void)
1068 {
1069 const int inet_diag_table_size = (IPPROTO_MAX *
1070 sizeof(struct inet_diag_handler *));
1071 int err = -ENOMEM;
1072
1073 inet_diag_table = kzalloc(inet_diag_table_size, GFP_KERNEL);
1074 if (!inet_diag_table)
1075 goto out;
1076
1077 err = sock_diag_register(&inet_diag_handler);
1078 if (err)
1079 goto out_free_nl;
1080
1081 err = sock_diag_register(&inet6_diag_handler);
1082 if (err)
1083 goto out_free_inet;
1084
1085 sock_diag_register_inet_compat(inet_diag_rcv_msg_compat);
1086 out:
1087 return err;
1088
1089 out_free_inet:
1090 sock_diag_unregister(&inet_diag_handler);
1091 out_free_nl:
1092 kfree(inet_diag_table);
1093 goto out;
1094 }
1095
1096 static void __exit inet_diag_exit(void)
1097 {
1098 sock_diag_unregister(&inet6_diag_handler);
1099 sock_diag_unregister(&inet_diag_handler);
1100 sock_diag_unregister_inet_compat(inet_diag_rcv_msg_compat);
1101 kfree(inet_diag_table);
1102 }
1103
1104 module_init(inet_diag_init);
1105 module_exit(inet_diag_exit);
1106 MODULE_LICENSE("GPL");
1107 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 2 /* AF_INET */);
1108 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 10 /* AF_INET6 */);
Linux kernel - Deliverables
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