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Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net
[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 #define INET_DIAG_PUT(skb, attrtype, attrlen) \
50 RTA_DATA(__RTA_PUT(skb, attrtype, attrlen))
51
52 static DEFINE_MUTEX(inet_diag_table_mutex);
53
54 static const struct inet_diag_handler *inet_diag_lock_handler(int proto)
55 {
56 if (!inet_diag_table[proto])
57 request_module("net-pf-%d-proto-%d-type-%d-%d", PF_NETLINK,
58 NETLINK_SOCK_DIAG, AF_INET, proto);
59
60 mutex_lock(&inet_diag_table_mutex);
61 if (!inet_diag_table[proto])
62 return ERR_PTR(-ENOENT);
63
64 return inet_diag_table[proto];
65 }
66
67 static inline void inet_diag_unlock_handler(
68 const struct inet_diag_handler *handler)
69 {
70 mutex_unlock(&inet_diag_table_mutex);
71 }
72
73 int inet_sk_diag_fill(struct sock *sk, struct inet_connection_sock *icsk,
74 struct sk_buff *skb, struct inet_diag_req_v2 *req,
75 u32 pid, u32 seq, u16 nlmsg_flags,
76 const struct nlmsghdr *unlh)
77 {
78 const struct inet_sock *inet = inet_sk(sk);
79 struct inet_diag_msg *r;
80 struct nlmsghdr *nlh;
81 void *info = NULL;
82 struct inet_diag_meminfo *minfo = NULL;
83 unsigned char *b = skb_tail_pointer(skb);
84 const struct inet_diag_handler *handler;
85 int ext = req->idiag_ext;
86
87 handler = inet_diag_table[req->sdiag_protocol];
88 BUG_ON(handler == NULL);
89
90 nlh = NLMSG_PUT(skb, pid, seq, unlh->nlmsg_type, sizeof(*r));
91 nlh->nlmsg_flags = nlmsg_flags;
92
93 r = NLMSG_DATA(nlh);
94 BUG_ON(sk->sk_state == TCP_TIME_WAIT);
95
96 if (ext & (1 << (INET_DIAG_MEMINFO - 1)))
97 minfo = INET_DIAG_PUT(skb, INET_DIAG_MEMINFO, sizeof(*minfo));
98
99 r->idiag_family = sk->sk_family;
100 r->idiag_state = sk->sk_state;
101 r->idiag_timer = 0;
102 r->idiag_retrans = 0;
103
104 r->id.idiag_if = sk->sk_bound_dev_if;
105 sock_diag_save_cookie(sk, r->id.idiag_cookie);
106
107 r->id.idiag_sport = inet->inet_sport;
108 r->id.idiag_dport = inet->inet_dport;
109 r->id.idiag_src[0] = inet->inet_rcv_saddr;
110 r->id.idiag_dst[0] = inet->inet_daddr;
111
112 /* IPv6 dual-stack sockets use inet->tos for IPv4 connections,
113 * hence this needs to be included regardless of socket family.
114 */
115 if (ext & (1 << (INET_DIAG_TOS - 1)))
116 RTA_PUT_U8(skb, INET_DIAG_TOS, inet->tos);
117
118 #if IS_ENABLED(CONFIG_IPV6)
119 if (r->idiag_family == AF_INET6) {
120 const struct ipv6_pinfo *np = inet6_sk(sk);
121
122 *(struct in6_addr *)r->id.idiag_src = np->rcv_saddr;
123 *(struct in6_addr *)r->id.idiag_dst = np->daddr;
124 if (ext & (1 << (INET_DIAG_TCLASS - 1)))
125 RTA_PUT_U8(skb, INET_DIAG_TCLASS, np->tclass);
126 }
127 #endif
128
129 r->idiag_uid = sock_i_uid(sk);
130 r->idiag_inode = sock_i_ino(sk);
131
132 if (minfo) {
133 minfo->idiag_rmem = sk_rmem_alloc_get(sk);
134 minfo->idiag_wmem = sk->sk_wmem_queued;
135 minfo->idiag_fmem = sk->sk_forward_alloc;
136 minfo->idiag_tmem = sk_wmem_alloc_get(sk);
137 }
138
139 if (ext & (1 << (INET_DIAG_SKMEMINFO - 1)))
140 if (sock_diag_put_meminfo(sk, skb, INET_DIAG_SKMEMINFO))
141 goto rtattr_failure;
142
143 if (icsk == NULL) {
144 handler->idiag_get_info(sk, r, NULL);
145 goto out;
146 }
147
148 #define EXPIRES_IN_MS(tmo) DIV_ROUND_UP((tmo - jiffies) * 1000, HZ)
149
150 if (icsk->icsk_pending == ICSK_TIME_RETRANS) {
151 r->idiag_timer = 1;
152 r->idiag_retrans = icsk->icsk_retransmits;
153 r->idiag_expires = EXPIRES_IN_MS(icsk->icsk_timeout);
154 } else if (icsk->icsk_pending == ICSK_TIME_PROBE0) {
155 r->idiag_timer = 4;
156 r->idiag_retrans = icsk->icsk_probes_out;
157 r->idiag_expires = EXPIRES_IN_MS(icsk->icsk_timeout);
158 } else if (timer_pending(&sk->sk_timer)) {
159 r->idiag_timer = 2;
160 r->idiag_retrans = icsk->icsk_probes_out;
161 r->idiag_expires = EXPIRES_IN_MS(sk->sk_timer.expires);
162 } else {
163 r->idiag_timer = 0;
164 r->idiag_expires = 0;
165 }
166 #undef EXPIRES_IN_MS
167
168 if (ext & (1 << (INET_DIAG_INFO - 1)))
169 info = INET_DIAG_PUT(skb, INET_DIAG_INFO, sizeof(struct tcp_info));
170
171 if ((ext & (1 << (INET_DIAG_CONG - 1))) && icsk->icsk_ca_ops) {
172 const size_t len = strlen(icsk->icsk_ca_ops->name);
173
174 strcpy(INET_DIAG_PUT(skb, INET_DIAG_CONG, len + 1),
175 icsk->icsk_ca_ops->name);
176 }
177
178 handler->idiag_get_info(sk, r, info);
179
180 if (sk->sk_state < TCP_TIME_WAIT &&
181 icsk->icsk_ca_ops && icsk->icsk_ca_ops->get_info)
182 icsk->icsk_ca_ops->get_info(sk, ext, skb);
183
184 out:
185 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
186 return skb->len;
187
188 rtattr_failure:
189 nlmsg_failure:
190 nlmsg_trim(skb, b);
191 return -EMSGSIZE;
192 }
193 EXPORT_SYMBOL_GPL(inet_sk_diag_fill);
194
195 static int inet_csk_diag_fill(struct sock *sk,
196 struct sk_buff *skb, struct inet_diag_req_v2 *req,
197 u32 pid, u32 seq, u16 nlmsg_flags,
198 const struct nlmsghdr *unlh)
199 {
200 return inet_sk_diag_fill(sk, inet_csk(sk),
201 skb, req, pid, seq, nlmsg_flags, unlh);
202 }
203
204 static int inet_twsk_diag_fill(struct inet_timewait_sock *tw,
205 struct sk_buff *skb, struct inet_diag_req_v2 *req,
206 u32 pid, u32 seq, u16 nlmsg_flags,
207 const struct nlmsghdr *unlh)
208 {
209 long tmo;
210 struct inet_diag_msg *r;
211 const unsigned char *previous_tail = skb_tail_pointer(skb);
212 struct nlmsghdr *nlh = NLMSG_PUT(skb, pid, seq,
213 unlh->nlmsg_type, sizeof(*r));
214
215 r = NLMSG_DATA(nlh);
216 BUG_ON(tw->tw_state != TCP_TIME_WAIT);
217
218 nlh->nlmsg_flags = nlmsg_flags;
219
220 tmo = tw->tw_ttd - jiffies;
221 if (tmo < 0)
222 tmo = 0;
223
224 r->idiag_family = tw->tw_family;
225 r->idiag_retrans = 0;
226 r->id.idiag_if = tw->tw_bound_dev_if;
227 sock_diag_save_cookie(tw, r->id.idiag_cookie);
228 r->id.idiag_sport = tw->tw_sport;
229 r->id.idiag_dport = tw->tw_dport;
230 r->id.idiag_src[0] = tw->tw_rcv_saddr;
231 r->id.idiag_dst[0] = tw->tw_daddr;
232 r->idiag_state = tw->tw_substate;
233 r->idiag_timer = 3;
234 r->idiag_expires = DIV_ROUND_UP(tmo * 1000, HZ);
235 r->idiag_rqueue = 0;
236 r->idiag_wqueue = 0;
237 r->idiag_uid = 0;
238 r->idiag_inode = 0;
239 #if IS_ENABLED(CONFIG_IPV6)
240 if (tw->tw_family == AF_INET6) {
241 const struct inet6_timewait_sock *tw6 =
242 inet6_twsk((struct sock *)tw);
243
244 *(struct in6_addr *)r->id.idiag_src = tw6->tw_v6_rcv_saddr;
245 *(struct in6_addr *)r->id.idiag_dst = tw6->tw_v6_daddr;
246 }
247 #endif
248 nlh->nlmsg_len = skb_tail_pointer(skb) - previous_tail;
249 return skb->len;
250 nlmsg_failure:
251 nlmsg_trim(skb, previous_tail);
252 return -EMSGSIZE;
253 }
254
255 static int sk_diag_fill(struct sock *sk, struct sk_buff *skb,
256 struct inet_diag_req_v2 *r, u32 pid, u32 seq, u16 nlmsg_flags,
257 const struct nlmsghdr *unlh)
258 {
259 if (sk->sk_state == TCP_TIME_WAIT)
260 return inet_twsk_diag_fill((struct inet_timewait_sock *)sk,
261 skb, r, pid, seq, nlmsg_flags,
262 unlh);
263 return inet_csk_diag_fill(sk, skb, r, pid, seq, nlmsg_flags, unlh);
264 }
265
266 int inet_diag_dump_one_icsk(struct inet_hashinfo *hashinfo, struct sk_buff *in_skb,
267 const struct nlmsghdr *nlh, struct inet_diag_req_v2 *req)
268 {
269 int err;
270 struct sock *sk;
271 struct sk_buff *rep;
272
273 err = -EINVAL;
274 if (req->sdiag_family == AF_INET) {
275 sk = inet_lookup(&init_net, hashinfo, req->id.idiag_dst[0],
276 req->id.idiag_dport, req->id.idiag_src[0],
277 req->id.idiag_sport, req->id.idiag_if);
278 }
279 #if IS_ENABLED(CONFIG_IPV6)
280 else if (req->sdiag_family == AF_INET6) {
281 sk = inet6_lookup(&init_net, hashinfo,
282 (struct in6_addr *)req->id.idiag_dst,
283 req->id.idiag_dport,
284 (struct in6_addr *)req->id.idiag_src,
285 req->id.idiag_sport,
286 req->id.idiag_if);
287 }
288 #endif
289 else {
290 goto out_nosk;
291 }
292
293 err = -ENOENT;
294 if (sk == NULL)
295 goto out_nosk;
296
297 err = sock_diag_check_cookie(sk, req->id.idiag_cookie);
298 if (err)
299 goto out;
300
301 err = -ENOMEM;
302 rep = alloc_skb(NLMSG_SPACE((sizeof(struct inet_diag_msg) +
303 sizeof(struct inet_diag_meminfo) +
304 sizeof(struct tcp_info) + 64)),
305 GFP_KERNEL);
306 if (!rep)
307 goto out;
308
309 err = sk_diag_fill(sk, rep, req,
310 NETLINK_CB(in_skb).pid,
311 nlh->nlmsg_seq, 0, nlh);
312 if (err < 0) {
313 WARN_ON(err == -EMSGSIZE);
314 kfree_skb(rep);
315 goto out;
316 }
317 err = netlink_unicast(sock_diag_nlsk, rep, NETLINK_CB(in_skb).pid,
318 MSG_DONTWAIT);
319 if (err > 0)
320 err = 0;
321
322 out:
323 if (sk) {
324 if (sk->sk_state == TCP_TIME_WAIT)
325 inet_twsk_put((struct inet_timewait_sock *)sk);
326 else
327 sock_put(sk);
328 }
329 out_nosk:
330 return err;
331 }
332 EXPORT_SYMBOL_GPL(inet_diag_dump_one_icsk);
333
334 static int inet_diag_get_exact(struct sk_buff *in_skb,
335 const struct nlmsghdr *nlh,
336 struct inet_diag_req_v2 *req)
337 {
338 const struct inet_diag_handler *handler;
339 int err;
340
341 handler = inet_diag_lock_handler(req->sdiag_protocol);
342 if (IS_ERR(handler))
343 err = PTR_ERR(handler);
344 else
345 err = handler->dump_one(in_skb, nlh, req);
346 inet_diag_unlock_handler(handler);
347
348 return err;
349 }
350
351 static int bitstring_match(const __be32 *a1, const __be32 *a2, int bits)
352 {
353 int words = bits >> 5;
354
355 bits &= 0x1f;
356
357 if (words) {
358 if (memcmp(a1, a2, words << 2))
359 return 0;
360 }
361 if (bits) {
362 __be32 w1, w2;
363 __be32 mask;
364
365 w1 = a1[words];
366 w2 = a2[words];
367
368 mask = htonl((0xffffffff) << (32 - bits));
369
370 if ((w1 ^ w2) & mask)
371 return 0;
372 }
373
374 return 1;
375 }
376
377
378 static int inet_diag_bc_run(const struct nlattr *_bc,
379 const struct inet_diag_entry *entry)
380 {
381 const void *bc = nla_data(_bc);
382 int len = nla_len(_bc);
383
384 while (len > 0) {
385 int yes = 1;
386 const struct inet_diag_bc_op *op = bc;
387
388 switch (op->code) {
389 case INET_DIAG_BC_NOP:
390 break;
391 case INET_DIAG_BC_JMP:
392 yes = 0;
393 break;
394 case INET_DIAG_BC_S_GE:
395 yes = entry->sport >= op[1].no;
396 break;
397 case INET_DIAG_BC_S_LE:
398 yes = entry->sport <= op[1].no;
399 break;
400 case INET_DIAG_BC_D_GE:
401 yes = entry->dport >= op[1].no;
402 break;
403 case INET_DIAG_BC_D_LE:
404 yes = entry->dport <= op[1].no;
405 break;
406 case INET_DIAG_BC_AUTO:
407 yes = !(entry->userlocks & SOCK_BINDPORT_LOCK);
408 break;
409 case INET_DIAG_BC_S_COND:
410 case INET_DIAG_BC_D_COND: {
411 struct inet_diag_hostcond *cond;
412 __be32 *addr;
413
414 cond = (struct inet_diag_hostcond *)(op + 1);
415 if (cond->port != -1 &&
416 cond->port != (op->code == INET_DIAG_BC_S_COND ?
417 entry->sport : entry->dport)) {
418 yes = 0;
419 break;
420 }
421
422 if (cond->prefix_len == 0)
423 break;
424
425 if (op->code == INET_DIAG_BC_S_COND)
426 addr = entry->saddr;
427 else
428 addr = entry->daddr;
429
430 if (bitstring_match(addr, cond->addr,
431 cond->prefix_len))
432 break;
433 if (entry->family == AF_INET6 &&
434 cond->family == AF_INET) {
435 if (addr[0] == 0 && addr[1] == 0 &&
436 addr[2] == htonl(0xffff) &&
437 bitstring_match(addr + 3, cond->addr,
438 cond->prefix_len))
439 break;
440 }
441 yes = 0;
442 break;
443 }
444 }
445
446 if (yes) {
447 len -= op->yes;
448 bc += op->yes;
449 } else {
450 len -= op->no;
451 bc += op->no;
452 }
453 }
454 return len == 0;
455 }
456
457 int inet_diag_bc_sk(const struct nlattr *bc, struct sock *sk)
458 {
459 struct inet_diag_entry entry;
460 struct inet_sock *inet = inet_sk(sk);
461
462 if (bc == NULL)
463 return 1;
464
465 entry.family = sk->sk_family;
466 #if IS_ENABLED(CONFIG_IPV6)
467 if (entry.family == AF_INET6) {
468 struct ipv6_pinfo *np = inet6_sk(sk);
469
470 entry.saddr = np->rcv_saddr.s6_addr32;
471 entry.daddr = np->daddr.s6_addr32;
472 } else
473 #endif
474 {
475 entry.saddr = &inet->inet_rcv_saddr;
476 entry.daddr = &inet->inet_daddr;
477 }
478 entry.sport = inet->inet_num;
479 entry.dport = ntohs(inet->inet_dport);
480 entry.userlocks = sk->sk_userlocks;
481
482 return inet_diag_bc_run(bc, &entry);
483 }
484 EXPORT_SYMBOL_GPL(inet_diag_bc_sk);
485
486 static int valid_cc(const void *bc, int len, int cc)
487 {
488 while (len >= 0) {
489 const struct inet_diag_bc_op *op = bc;
490
491 if (cc > len)
492 return 0;
493 if (cc == len)
494 return 1;
495 if (op->yes < 4 || op->yes & 3)
496 return 0;
497 len -= op->yes;
498 bc += op->yes;
499 }
500 return 0;
501 }
502
503 static int inet_diag_bc_audit(const void *bytecode, int bytecode_len)
504 {
505 const void *bc = bytecode;
506 int len = bytecode_len;
507
508 while (len > 0) {
509 const struct inet_diag_bc_op *op = bc;
510
511 //printk("BC: %d %d %d {%d} / %d\n", op->code, op->yes, op->no, op[1].no, len);
512 switch (op->code) {
513 case INET_DIAG_BC_AUTO:
514 case INET_DIAG_BC_S_COND:
515 case INET_DIAG_BC_D_COND:
516 case INET_DIAG_BC_S_GE:
517 case INET_DIAG_BC_S_LE:
518 case INET_DIAG_BC_D_GE:
519 case INET_DIAG_BC_D_LE:
520 case INET_DIAG_BC_JMP:
521 if (op->no < 4 || op->no > len + 4 || op->no & 3)
522 return -EINVAL;
523 if (op->no < len &&
524 !valid_cc(bytecode, bytecode_len, len - op->no))
525 return -EINVAL;
526 break;
527 case INET_DIAG_BC_NOP:
528 break;
529 default:
530 return -EINVAL;
531 }
532 if (op->yes < 4 || op->yes > len + 4 || op->yes & 3)
533 return -EINVAL;
534 bc += op->yes;
535 len -= op->yes;
536 }
537 return len == 0 ? 0 : -EINVAL;
538 }
539
540 static int inet_csk_diag_dump(struct sock *sk,
541 struct sk_buff *skb,
542 struct netlink_callback *cb,
543 struct inet_diag_req_v2 *r,
544 const struct nlattr *bc)
545 {
546 if (!inet_diag_bc_sk(bc, sk))
547 return 0;
548
549 return inet_csk_diag_fill(sk, skb, r,
550 NETLINK_CB(cb->skb).pid,
551 cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh);
552 }
553
554 static int inet_twsk_diag_dump(struct inet_timewait_sock *tw,
555 struct sk_buff *skb,
556 struct netlink_callback *cb,
557 struct inet_diag_req_v2 *r,
558 const struct nlattr *bc)
559 {
560 if (bc != NULL) {
561 struct inet_diag_entry entry;
562
563 entry.family = tw->tw_family;
564 #if IS_ENABLED(CONFIG_IPV6)
565 if (tw->tw_family == AF_INET6) {
566 struct inet6_timewait_sock *tw6 =
567 inet6_twsk((struct sock *)tw);
568 entry.saddr = tw6->tw_v6_rcv_saddr.s6_addr32;
569 entry.daddr = tw6->tw_v6_daddr.s6_addr32;
570 } else
571 #endif
572 {
573 entry.saddr = &tw->tw_rcv_saddr;
574 entry.daddr = &tw->tw_daddr;
575 }
576 entry.sport = tw->tw_num;
577 entry.dport = ntohs(tw->tw_dport);
578 entry.userlocks = 0;
579
580 if (!inet_diag_bc_run(bc, &entry))
581 return 0;
582 }
583
584 return inet_twsk_diag_fill(tw, skb, r,
585 NETLINK_CB(cb->skb).pid,
586 cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh);
587 }
588
589 static int inet_diag_fill_req(struct sk_buff *skb, struct sock *sk,
590 struct request_sock *req, u32 pid, u32 seq,
591 const struct nlmsghdr *unlh)
592 {
593 const struct inet_request_sock *ireq = inet_rsk(req);
594 struct inet_sock *inet = inet_sk(sk);
595 unsigned char *b = skb_tail_pointer(skb);
596 struct inet_diag_msg *r;
597 struct nlmsghdr *nlh;
598 long tmo;
599
600 nlh = NLMSG_PUT(skb, pid, seq, unlh->nlmsg_type, sizeof(*r));
601 nlh->nlmsg_flags = NLM_F_MULTI;
602 r = NLMSG_DATA(nlh);
603
604 r->idiag_family = sk->sk_family;
605 r->idiag_state = TCP_SYN_RECV;
606 r->idiag_timer = 1;
607 r->idiag_retrans = req->retrans;
608
609 r->id.idiag_if = sk->sk_bound_dev_if;
610 sock_diag_save_cookie(req, r->id.idiag_cookie);
611
612 tmo = req->expires - jiffies;
613 if (tmo < 0)
614 tmo = 0;
615
616 r->id.idiag_sport = inet->inet_sport;
617 r->id.idiag_dport = ireq->rmt_port;
618 r->id.idiag_src[0] = ireq->loc_addr;
619 r->id.idiag_dst[0] = ireq->rmt_addr;
620 r->idiag_expires = jiffies_to_msecs(tmo);
621 r->idiag_rqueue = 0;
622 r->idiag_wqueue = 0;
623 r->idiag_uid = sock_i_uid(sk);
624 r->idiag_inode = 0;
625 #if IS_ENABLED(CONFIG_IPV6)
626 if (r->idiag_family == AF_INET6) {
627 *(struct in6_addr *)r->id.idiag_src = inet6_rsk(req)->loc_addr;
628 *(struct in6_addr *)r->id.idiag_dst = inet6_rsk(req)->rmt_addr;
629 }
630 #endif
631 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
632
633 return skb->len;
634
635 nlmsg_failure:
636 nlmsg_trim(skb, b);
637 return -1;
638 }
639
640 static int inet_diag_dump_reqs(struct sk_buff *skb, struct sock *sk,
641 struct netlink_callback *cb,
642 struct inet_diag_req_v2 *r,
643 const struct nlattr *bc)
644 {
645 struct inet_diag_entry entry;
646 struct inet_connection_sock *icsk = inet_csk(sk);
647 struct listen_sock *lopt;
648 struct inet_sock *inet = inet_sk(sk);
649 int j, s_j;
650 int reqnum, s_reqnum;
651 int err = 0;
652
653 s_j = cb->args[3];
654 s_reqnum = cb->args[4];
655
656 if (s_j > 0)
657 s_j--;
658
659 entry.family = sk->sk_family;
660
661 read_lock_bh(&icsk->icsk_accept_queue.syn_wait_lock);
662
663 lopt = icsk->icsk_accept_queue.listen_opt;
664 if (!lopt || !lopt->qlen)
665 goto out;
666
667 if (bc != NULL) {
668 entry.sport = inet->inet_num;
669 entry.userlocks = sk->sk_userlocks;
670 }
671
672 for (j = s_j; j < lopt->nr_table_entries; j++) {
673 struct request_sock *req, *head = lopt->syn_table[j];
674
675 reqnum = 0;
676 for (req = head; req; reqnum++, req = req->dl_next) {
677 struct inet_request_sock *ireq = inet_rsk(req);
678
679 if (reqnum < s_reqnum)
680 continue;
681 if (r->id.idiag_dport != ireq->rmt_port &&
682 r->id.idiag_dport)
683 continue;
684
685 if (bc) {
686 entry.saddr =
687 #if IS_ENABLED(CONFIG_IPV6)
688 (entry.family == AF_INET6) ?
689 inet6_rsk(req)->loc_addr.s6_addr32 :
690 #endif
691 &ireq->loc_addr;
692 entry.daddr =
693 #if IS_ENABLED(CONFIG_IPV6)
694 (entry.family == AF_INET6) ?
695 inet6_rsk(req)->rmt_addr.s6_addr32 :
696 #endif
697 &ireq->rmt_addr;
698 entry.dport = ntohs(ireq->rmt_port);
699
700 if (!inet_diag_bc_run(bc, &entry))
701 continue;
702 }
703
704 err = inet_diag_fill_req(skb, sk, req,
705 NETLINK_CB(cb->skb).pid,
706 cb->nlh->nlmsg_seq, cb->nlh);
707 if (err < 0) {
708 cb->args[3] = j + 1;
709 cb->args[4] = reqnum;
710 goto out;
711 }
712 }
713
714 s_reqnum = 0;
715 }
716
717 out:
718 read_unlock_bh(&icsk->icsk_accept_queue.syn_wait_lock);
719
720 return err;
721 }
722
723 void inet_diag_dump_icsk(struct inet_hashinfo *hashinfo, struct sk_buff *skb,
724 struct netlink_callback *cb, struct inet_diag_req_v2 *r, struct nlattr *bc)
725 {
726 int i, num;
727 int s_i, s_num;
728
729 s_i = cb->args[1];
730 s_num = num = cb->args[2];
731
732 if (cb->args[0] == 0) {
733 if (!(r->idiag_states & (TCPF_LISTEN | TCPF_SYN_RECV)))
734 goto skip_listen_ht;
735
736 for (i = s_i; i < INET_LHTABLE_SIZE; i++) {
737 struct sock *sk;
738 struct hlist_nulls_node *node;
739 struct inet_listen_hashbucket *ilb;
740
741 num = 0;
742 ilb = &hashinfo->listening_hash[i];
743 spin_lock_bh(&ilb->lock);
744 sk_nulls_for_each(sk, node, &ilb->head) {
745 struct inet_sock *inet = inet_sk(sk);
746
747 if (num < s_num) {
748 num++;
749 continue;
750 }
751
752 if (r->sdiag_family != AF_UNSPEC &&
753 sk->sk_family != r->sdiag_family)
754 goto next_listen;
755
756 if (r->id.idiag_sport != inet->inet_sport &&
757 r->id.idiag_sport)
758 goto next_listen;
759
760 if (!(r->idiag_states & TCPF_LISTEN) ||
761 r->id.idiag_dport ||
762 cb->args[3] > 0)
763 goto syn_recv;
764
765 if (inet_csk_diag_dump(sk, skb, cb, r, bc) < 0) {
766 spin_unlock_bh(&ilb->lock);
767 goto done;
768 }
769
770 syn_recv:
771 if (!(r->idiag_states & TCPF_SYN_RECV))
772 goto next_listen;
773
774 if (inet_diag_dump_reqs(skb, sk, cb, r, bc) < 0) {
775 spin_unlock_bh(&ilb->lock);
776 goto done;
777 }
778
779 next_listen:
780 cb->args[3] = 0;
781 cb->args[4] = 0;
782 ++num;
783 }
784 spin_unlock_bh(&ilb->lock);
785
786 s_num = 0;
787 cb->args[3] = 0;
788 cb->args[4] = 0;
789 }
790 skip_listen_ht:
791 cb->args[0] = 1;
792 s_i = num = s_num = 0;
793 }
794
795 if (!(r->idiag_states & ~(TCPF_LISTEN | TCPF_SYN_RECV)))
796 goto out;
797
798 for (i = s_i; i <= hashinfo->ehash_mask; i++) {
799 struct inet_ehash_bucket *head = &hashinfo->ehash[i];
800 spinlock_t *lock = inet_ehash_lockp(hashinfo, i);
801 struct sock *sk;
802 struct hlist_nulls_node *node;
803
804 num = 0;
805
806 if (hlist_nulls_empty(&head->chain) &&
807 hlist_nulls_empty(&head->twchain))
808 continue;
809
810 if (i > s_i)
811 s_num = 0;
812
813 spin_lock_bh(lock);
814 sk_nulls_for_each(sk, node, &head->chain) {
815 struct inet_sock *inet = inet_sk(sk);
816
817 if (num < s_num)
818 goto next_normal;
819 if (!(r->idiag_states & (1 << sk->sk_state)))
820 goto next_normal;
821 if (r->sdiag_family != AF_UNSPEC &&
822 sk->sk_family != r->sdiag_family)
823 goto next_normal;
824 if (r->id.idiag_sport != inet->inet_sport &&
825 r->id.idiag_sport)
826 goto next_normal;
827 if (r->id.idiag_dport != inet->inet_dport &&
828 r->id.idiag_dport)
829 goto next_normal;
830 if (inet_csk_diag_dump(sk, skb, cb, r, bc) < 0) {
831 spin_unlock_bh(lock);
832 goto done;
833 }
834 next_normal:
835 ++num;
836 }
837
838 if (r->idiag_states & TCPF_TIME_WAIT) {
839 struct inet_timewait_sock *tw;
840
841 inet_twsk_for_each(tw, node,
842 &head->twchain) {
843
844 if (num < s_num)
845 goto next_dying;
846 if (r->sdiag_family != AF_UNSPEC &&
847 tw->tw_family != r->sdiag_family)
848 goto next_dying;
849 if (r->id.idiag_sport != tw->tw_sport &&
850 r->id.idiag_sport)
851 goto next_dying;
852 if (r->id.idiag_dport != tw->tw_dport &&
853 r->id.idiag_dport)
854 goto next_dying;
855 if (inet_twsk_diag_dump(tw, skb, cb, r, bc) < 0) {
856 spin_unlock_bh(lock);
857 goto done;
858 }
859 next_dying:
860 ++num;
861 }
862 }
863 spin_unlock_bh(lock);
864 }
865
866 done:
867 cb->args[1] = i;
868 cb->args[2] = num;
869 out:
870 ;
871 }
872 EXPORT_SYMBOL_GPL(inet_diag_dump_icsk);
873
874 static int __inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb,
875 struct inet_diag_req_v2 *r, struct nlattr *bc)
876 {
877 const struct inet_diag_handler *handler;
878
879 handler = inet_diag_lock_handler(r->sdiag_protocol);
880 if (!IS_ERR(handler))
881 handler->dump(skb, cb, r, bc);
882 inet_diag_unlock_handler(handler);
883
884 return skb->len;
885 }
886
887 static int inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb)
888 {
889 struct nlattr *bc = NULL;
890 int hdrlen = sizeof(struct inet_diag_req_v2);
891
892 if (nlmsg_attrlen(cb->nlh, hdrlen))
893 bc = nlmsg_find_attr(cb->nlh, hdrlen, INET_DIAG_REQ_BYTECODE);
894
895 return __inet_diag_dump(skb, cb, (struct inet_diag_req_v2 *)NLMSG_DATA(cb->nlh), bc);
896 }
897
898 static inline int inet_diag_type2proto(int type)
899 {
900 switch (type) {
901 case TCPDIAG_GETSOCK:
902 return IPPROTO_TCP;
903 case DCCPDIAG_GETSOCK:
904 return IPPROTO_DCCP;
905 default:
906 return 0;
907 }
908 }
909
910 static int inet_diag_dump_compat(struct sk_buff *skb, struct netlink_callback *cb)
911 {
912 struct inet_diag_req *rc = NLMSG_DATA(cb->nlh);
913 struct inet_diag_req_v2 req;
914 struct nlattr *bc = NULL;
915 int hdrlen = sizeof(struct inet_diag_req);
916
917 req.sdiag_family = AF_UNSPEC; /* compatibility */
918 req.sdiag_protocol = inet_diag_type2proto(cb->nlh->nlmsg_type);
919 req.idiag_ext = rc->idiag_ext;
920 req.idiag_states = rc->idiag_states;
921 req.id = rc->id;
922
923 if (nlmsg_attrlen(cb->nlh, hdrlen))
924 bc = nlmsg_find_attr(cb->nlh, hdrlen, INET_DIAG_REQ_BYTECODE);
925
926 return __inet_diag_dump(skb, cb, &req, bc);
927 }
928
929 static int inet_diag_get_exact_compat(struct sk_buff *in_skb,
930 const struct nlmsghdr *nlh)
931 {
932 struct inet_diag_req *rc = NLMSG_DATA(nlh);
933 struct inet_diag_req_v2 req;
934
935 req.sdiag_family = rc->idiag_family;
936 req.sdiag_protocol = inet_diag_type2proto(nlh->nlmsg_type);
937 req.idiag_ext = rc->idiag_ext;
938 req.idiag_states = rc->idiag_states;
939 req.id = rc->id;
940
941 return inet_diag_get_exact(in_skb, nlh, &req);
942 }
943
944 static int inet_diag_rcv_msg_compat(struct sk_buff *skb, struct nlmsghdr *nlh)
945 {
946 int hdrlen = sizeof(struct inet_diag_req);
947
948 if (nlh->nlmsg_type >= INET_DIAG_GETSOCK_MAX ||
949 nlmsg_len(nlh) < hdrlen)
950 return -EINVAL;
951
952 if (nlh->nlmsg_flags & NLM_F_DUMP) {
953 if (nlmsg_attrlen(nlh, hdrlen)) {
954 struct nlattr *attr;
955
956 attr = nlmsg_find_attr(nlh, hdrlen,
957 INET_DIAG_REQ_BYTECODE);
958 if (attr == NULL ||
959 nla_len(attr) < sizeof(struct inet_diag_bc_op) ||
960 inet_diag_bc_audit(nla_data(attr), nla_len(attr)))
961 return -EINVAL;
962 }
963 {
964 struct netlink_dump_control c = {
965 .dump = inet_diag_dump_compat,
966 };
967 return netlink_dump_start(sock_diag_nlsk, skb, nlh, &c);
968 }
969 }
970
971 return inet_diag_get_exact_compat(skb, nlh);
972 }
973
974 static int inet_diag_handler_dump(struct sk_buff *skb, struct nlmsghdr *h)
975 {
976 int hdrlen = sizeof(struct inet_diag_req_v2);
977
978 if (nlmsg_len(h) < hdrlen)
979 return -EINVAL;
980
981 if (h->nlmsg_flags & NLM_F_DUMP) {
982 if (nlmsg_attrlen(h, hdrlen)) {
983 struct nlattr *attr;
984 attr = nlmsg_find_attr(h, hdrlen,
985 INET_DIAG_REQ_BYTECODE);
986 if (attr == NULL ||
987 nla_len(attr) < sizeof(struct inet_diag_bc_op) ||
988 inet_diag_bc_audit(nla_data(attr), nla_len(attr)))
989 return -EINVAL;
990 }
991 {
992 struct netlink_dump_control c = {
993 .dump = inet_diag_dump,
994 };
995 return netlink_dump_start(sock_diag_nlsk, skb, h, &c);
996 }
997 }
998
999 return inet_diag_get_exact(skb, h, (struct inet_diag_req_v2 *)NLMSG_DATA(h));
1000 }
1001
1002 static const struct sock_diag_handler inet_diag_handler = {
1003 .family = AF_INET,
1004 .dump = inet_diag_handler_dump,
1005 };
1006
1007 static const struct sock_diag_handler inet6_diag_handler = {
1008 .family = AF_INET6,
1009 .dump = inet_diag_handler_dump,
1010 };
1011
1012 int inet_diag_register(const struct inet_diag_handler *h)
1013 {
1014 const __u16 type = h->idiag_type;
1015 int err = -EINVAL;
1016
1017 if (type >= IPPROTO_MAX)
1018 goto out;
1019
1020 mutex_lock(&inet_diag_table_mutex);
1021 err = -EEXIST;
1022 if (inet_diag_table[type] == NULL) {
1023 inet_diag_table[type] = h;
1024 err = 0;
1025 }
1026 mutex_unlock(&inet_diag_table_mutex);
1027 out:
1028 return err;
1029 }
1030 EXPORT_SYMBOL_GPL(inet_diag_register);
1031
1032 void inet_diag_unregister(const struct inet_diag_handler *h)
1033 {
1034 const __u16 type = h->idiag_type;
1035
1036 if (type >= IPPROTO_MAX)
1037 return;
1038
1039 mutex_lock(&inet_diag_table_mutex);
1040 inet_diag_table[type] = NULL;
1041 mutex_unlock(&inet_diag_table_mutex);
1042 }
1043 EXPORT_SYMBOL_GPL(inet_diag_unregister);
1044
1045 static int __init inet_diag_init(void)
1046 {
1047 const int inet_diag_table_size = (IPPROTO_MAX *
1048 sizeof(struct inet_diag_handler *));
1049 int err = -ENOMEM;
1050
1051 inet_diag_table = kzalloc(inet_diag_table_size, GFP_KERNEL);
1052 if (!inet_diag_table)
1053 goto out;
1054
1055 err = sock_diag_register(&inet_diag_handler);
1056 if (err)
1057 goto out_free_nl;
1058
1059 err = sock_diag_register(&inet6_diag_handler);
1060 if (err)
1061 goto out_free_inet;
1062
1063 sock_diag_register_inet_compat(inet_diag_rcv_msg_compat);
1064 out:
1065 return err;
1066
1067 out_free_inet:
1068 sock_diag_unregister(&inet_diag_handler);
1069 out_free_nl:
1070 kfree(inet_diag_table);
1071 goto out;
1072 }
1073
1074 static void __exit inet_diag_exit(void)
1075 {
1076 sock_diag_unregister(&inet6_diag_handler);
1077 sock_diag_unregister(&inet_diag_handler);
1078 sock_diag_unregister_inet_compat(inet_diag_rcv_msg_compat);
1079 kfree(inet_diag_table);
1080 }
1081
1082 module_init(inet_diag_init);
1083 module_exit(inet_diag_exit);
1084 MODULE_LICENSE("GPL");
1085 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 2 /* AF_INET */);
1086 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 10 /* AF_INET6 */);
Linux kernel - Deliverables
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