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mfd: wm8350-i2c: Make sure the i2c regmap functions are compiled
[linux/fpc-iii.git] / net / ipv4 / inet_diag.c
blob14a1ed611b059f00cfd9ebd0f66c816f8ebf38ea
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 #if IS_ENABLED(CONFIG_IPV6)
48 struct in6_addr saddr_storage; /* for IPv4-mapped-IPv6 addresses */
49 struct in6_addr daddr_storage; /* for IPv4-mapped-IPv6 addresses */
50 #endif
51 };
52
53 static DEFINE_MUTEX(inet_diag_table_mutex);
54
55 static const struct inet_diag_handler *inet_diag_lock_handler(int proto)
56 {
57 if (!inet_diag_table[proto])
58 request_module("net-pf-%d-proto-%d-type-%d-%d", PF_NETLINK,
59 NETLINK_SOCK_DIAG, AF_INET, proto);
60
61 mutex_lock(&inet_diag_table_mutex);
62 if (!inet_diag_table[proto])
63 return ERR_PTR(-ENOENT);
64
65 return inet_diag_table[proto];
66 }
67
68 static inline void inet_diag_unlock_handler(
69 const struct inet_diag_handler *handler)
70 {
71 mutex_unlock(&inet_diag_table_mutex);
72 }
73
74 static size_t inet_sk_attr_size(void)
75 {
76 return nla_total_size(sizeof(struct tcp_info))
77 + nla_total_size(1) /* INET_DIAG_SHUTDOWN */
78 + nla_total_size(1) /* INET_DIAG_TOS */
79 + nla_total_size(1) /* INET_DIAG_TCLASS */
80 + nla_total_size(sizeof(struct inet_diag_meminfo))
81 + nla_total_size(sizeof(struct inet_diag_msg))
82 + nla_total_size(SK_MEMINFO_VARS * sizeof(u32))
83 + nla_total_size(TCP_CA_NAME_MAX)
84 + nla_total_size(sizeof(struct tcpvegas_info))
85 + 64;
86 }
87
88 int inet_sk_diag_fill(struct sock *sk, struct inet_connection_sock *icsk,
89 struct sk_buff *skb, struct inet_diag_req_v2 *req,
90 struct user_namespace *user_ns,
91 u32 portid, u32 seq, u16 nlmsg_flags,
92 const struct nlmsghdr *unlh)
93 {
94 const struct inet_sock *inet = inet_sk(sk);
95 struct inet_diag_msg *r;
96 struct nlmsghdr *nlh;
97 struct nlattr *attr;
98 void *info = NULL;
99 const struct inet_diag_handler *handler;
100 int ext = req->idiag_ext;
101
102 handler = inet_diag_table[req->sdiag_protocol];
103 BUG_ON(handler == NULL);
104
105 nlh = nlmsg_put(skb, portid, seq, unlh->nlmsg_type, sizeof(*r),
106 nlmsg_flags);
107 if (!nlh)
108 return -EMSGSIZE;
109
110 r = nlmsg_data(nlh);
111 BUG_ON(sk->sk_state == TCP_TIME_WAIT);
112
113 r->idiag_family = sk->sk_family;
114 r->idiag_state = sk->sk_state;
115 r->idiag_timer = 0;
116 r->idiag_retrans = 0;
117
118 r->id.idiag_if = sk->sk_bound_dev_if;
119 sock_diag_save_cookie(sk, r->id.idiag_cookie);
120
121 r->id.idiag_sport = inet->inet_sport;
122 r->id.idiag_dport = inet->inet_dport;
123
124 memset(&r->id.idiag_src, 0, sizeof(r->id.idiag_src));
125 memset(&r->id.idiag_dst, 0, sizeof(r->id.idiag_dst));
126
127 r->id.idiag_src[0] = inet->inet_rcv_saddr;
128 r->id.idiag_dst[0] = inet->inet_daddr;
129
130 if (nla_put_u8(skb, INET_DIAG_SHUTDOWN, sk->sk_shutdown))
131 goto errout;
132
133 /* IPv6 dual-stack sockets use inet->tos for IPv4 connections,
134 * hence this needs to be included regardless of socket family.
135 */
136 if (ext & (1 << (INET_DIAG_TOS - 1)))
137 if (nla_put_u8(skb, INET_DIAG_TOS, inet->tos) < 0)
138 goto errout;
139
140 #if IS_ENABLED(CONFIG_IPV6)
141 if (r->idiag_family == AF_INET6) {
142 const struct ipv6_pinfo *np = inet6_sk(sk);
143
144 *(struct in6_addr *)r->id.idiag_src = np->rcv_saddr;
145 *(struct in6_addr *)r->id.idiag_dst = np->daddr;
146
147 if (ext & (1 << (INET_DIAG_TCLASS - 1)))
148 if (nla_put_u8(skb, INET_DIAG_TCLASS, np->tclass) < 0)
149 goto errout;
150 }
151 #endif
152
153 r->idiag_uid = from_kuid_munged(user_ns, sock_i_uid(sk));
154 r->idiag_inode = sock_i_ino(sk);
155
156 if (ext & (1 << (INET_DIAG_MEMINFO - 1))) {
157 struct inet_diag_meminfo minfo = {
158 .idiag_rmem = sk_rmem_alloc_get(sk),
159 .idiag_wmem = sk->sk_wmem_queued,
160 .idiag_fmem = sk->sk_forward_alloc,
161 .idiag_tmem = sk_wmem_alloc_get(sk),
162 };
163
164 if (nla_put(skb, INET_DIAG_MEMINFO, sizeof(minfo), &minfo) < 0)
165 goto errout;
166 }
167
168 if (ext & (1 << (INET_DIAG_SKMEMINFO - 1)))
169 if (sock_diag_put_meminfo(sk, skb, INET_DIAG_SKMEMINFO))
170 goto errout;
171
172 if (icsk == NULL) {
173 handler->idiag_get_info(sk, r, NULL);
174 goto out;
175 }
176
177 #define EXPIRES_IN_MS(tmo) DIV_ROUND_UP((tmo - jiffies) * 1000, HZ)
178
179 if (icsk->icsk_pending == ICSK_TIME_RETRANS ||
180 icsk->icsk_pending == ICSK_TIME_EARLY_RETRANS ||
181 icsk->icsk_pending == ICSK_TIME_LOSS_PROBE) {
182 r->idiag_timer = 1;
183 r->idiag_retrans = icsk->icsk_retransmits;
184 r->idiag_expires = EXPIRES_IN_MS(icsk->icsk_timeout);
185 } else if (icsk->icsk_pending == ICSK_TIME_PROBE0) {
186 r->idiag_timer = 4;
187 r->idiag_retrans = icsk->icsk_probes_out;
188 r->idiag_expires = EXPIRES_IN_MS(icsk->icsk_timeout);
189 } else if (timer_pending(&sk->sk_timer)) {
190 r->idiag_timer = 2;
191 r->idiag_retrans = icsk->icsk_probes_out;
192 r->idiag_expires = EXPIRES_IN_MS(sk->sk_timer.expires);
193 } else {
194 r->idiag_timer = 0;
195 r->idiag_expires = 0;
196 }
197 #undef EXPIRES_IN_MS
198
199 if (ext & (1 << (INET_DIAG_INFO - 1))) {
200 attr = nla_reserve(skb, INET_DIAG_INFO,
201 sizeof(struct tcp_info));
202 if (!attr)
203 goto errout;
204
205 info = nla_data(attr);
206 }
207
208 if ((ext & (1 << (INET_DIAG_CONG - 1))) && icsk->icsk_ca_ops)
209 if (nla_put_string(skb, INET_DIAG_CONG,
210 icsk->icsk_ca_ops->name) < 0)
211 goto errout;
212
213 handler->idiag_get_info(sk, r, info);
214
215 if (sk->sk_state < TCP_TIME_WAIT &&
216 icsk->icsk_ca_ops && icsk->icsk_ca_ops->get_info)
217 icsk->icsk_ca_ops->get_info(sk, ext, skb);
218
219 out:
220 return nlmsg_end(skb, nlh);
221
222 errout:
223 nlmsg_cancel(skb, nlh);
224 return -EMSGSIZE;
225 }
226 EXPORT_SYMBOL_GPL(inet_sk_diag_fill);
227
228 static int inet_csk_diag_fill(struct sock *sk,
229 struct sk_buff *skb, struct inet_diag_req_v2 *req,
230 struct user_namespace *user_ns,
231 u32 portid, u32 seq, u16 nlmsg_flags,
232 const struct nlmsghdr *unlh)
233 {
234 return inet_sk_diag_fill(sk, inet_csk(sk),
235 skb, req, user_ns, portid, seq, nlmsg_flags, unlh);
236 }
237
238 static int inet_twsk_diag_fill(struct inet_timewait_sock *tw,
239 struct sk_buff *skb, struct inet_diag_req_v2 *req,
240 u32 portid, u32 seq, u16 nlmsg_flags,
241 const struct nlmsghdr *unlh)
242 {
243 long tmo;
244 struct inet_diag_msg *r;
245 struct nlmsghdr *nlh;
246
247 nlh = nlmsg_put(skb, portid, seq, unlh->nlmsg_type, sizeof(*r),
248 nlmsg_flags);
249 if (!nlh)
250 return -EMSGSIZE;
251
252 r = nlmsg_data(nlh);
253 BUG_ON(tw->tw_state != TCP_TIME_WAIT);
254
255 tmo = tw->tw_ttd - jiffies;
256 if (tmo < 0)
257 tmo = 0;
258
259 r->idiag_family = tw->tw_family;
260 r->idiag_retrans = 0;
261
262 r->id.idiag_if = tw->tw_bound_dev_if;
263 sock_diag_save_cookie(tw, r->id.idiag_cookie);
264
265 r->id.idiag_sport = tw->tw_sport;
266 r->id.idiag_dport = tw->tw_dport;
267
268 memset(&r->id.idiag_src, 0, sizeof(r->id.idiag_src));
269 memset(&r->id.idiag_dst, 0, sizeof(r->id.idiag_dst));
270
271 r->id.idiag_src[0] = tw->tw_rcv_saddr;
272 r->id.idiag_dst[0] = tw->tw_daddr;
273
274 r->idiag_state = tw->tw_substate;
275 r->idiag_timer = 3;
276 r->idiag_expires = DIV_ROUND_UP(tmo * 1000, HZ);
277 r->idiag_rqueue = 0;
278 r->idiag_wqueue = 0;
279 r->idiag_uid = 0;
280 r->idiag_inode = 0;
281 #if IS_ENABLED(CONFIG_IPV6)
282 if (tw->tw_family == AF_INET6) {
283 const struct inet6_timewait_sock *tw6 =
284 inet6_twsk((struct sock *)tw);
285
286 *(struct in6_addr *)r->id.idiag_src = tw6->tw_v6_rcv_saddr;
287 *(struct in6_addr *)r->id.idiag_dst = tw6->tw_v6_daddr;
288 }
289 #endif
290
291 return nlmsg_end(skb, nlh);
292 }
293
294 static int sk_diag_fill(struct sock *sk, struct sk_buff *skb,
295 struct inet_diag_req_v2 *r,
296 struct user_namespace *user_ns,
297 u32 portid, u32 seq, u16 nlmsg_flags,
298 const struct nlmsghdr *unlh)
299 {
300 if (sk->sk_state == TCP_TIME_WAIT)
301 return inet_twsk_diag_fill((struct inet_timewait_sock *)sk,
302 skb, r, portid, seq, nlmsg_flags,
303 unlh);
304 return inet_csk_diag_fill(sk, skb, r, user_ns, portid, seq, nlmsg_flags, unlh);
305 }
306
307 int inet_diag_dump_one_icsk(struct inet_hashinfo *hashinfo, struct sk_buff *in_skb,
308 const struct nlmsghdr *nlh, struct inet_diag_req_v2 *req)
309 {
310 int err;
311 struct sock *sk;
312 struct sk_buff *rep;
313 struct net *net = sock_net(in_skb->sk);
314
315 err = -EINVAL;
316 if (req->sdiag_family == AF_INET) {
317 sk = inet_lookup(net, hashinfo, req->id.idiag_dst[0],
318 req->id.idiag_dport, req->id.idiag_src[0],
319 req->id.idiag_sport, req->id.idiag_if);
320 }
321 #if IS_ENABLED(CONFIG_IPV6)
322 else if (req->sdiag_family == AF_INET6) {
323 sk = inet6_lookup(net, hashinfo,
324 (struct in6_addr *)req->id.idiag_dst,
325 req->id.idiag_dport,
326 (struct in6_addr *)req->id.idiag_src,
327 req->id.idiag_sport,
328 req->id.idiag_if);
329 }
330 #endif
331 else {
332 goto out_nosk;
333 }
334
335 err = -ENOENT;
336 if (sk == NULL)
337 goto out_nosk;
338
339 err = sock_diag_check_cookie(sk, req->id.idiag_cookie);
340 if (err)
341 goto out;
342
343 rep = nlmsg_new(inet_sk_attr_size(), GFP_KERNEL);
344 if (!rep) {
345 err = -ENOMEM;
346 goto out;
347 }
348
349 err = sk_diag_fill(sk, rep, req,
350 sk_user_ns(NETLINK_CB(in_skb).sk),
351 NETLINK_CB(in_skb).portid,
352 nlh->nlmsg_seq, 0, nlh);
353 if (err < 0) {
354 WARN_ON(err == -EMSGSIZE);
355 nlmsg_free(rep);
356 goto out;
357 }
358 err = netlink_unicast(net->diag_nlsk, rep, NETLINK_CB(in_skb).portid,
359 MSG_DONTWAIT);
360 if (err > 0)
361 err = 0;
362
363 out:
364 if (sk) {
365 if (sk->sk_state == TCP_TIME_WAIT)
366 inet_twsk_put((struct inet_timewait_sock *)sk);
367 else
368 sock_put(sk);
369 }
370 out_nosk:
371 return err;
372 }
373 EXPORT_SYMBOL_GPL(inet_diag_dump_one_icsk);
374
375 static int inet_diag_get_exact(struct sk_buff *in_skb,
376 const struct nlmsghdr *nlh,
377 struct inet_diag_req_v2 *req)
378 {
379 const struct inet_diag_handler *handler;
380 int err;
381
382 handler = inet_diag_lock_handler(req->sdiag_protocol);
383 if (IS_ERR(handler))
384 err = PTR_ERR(handler);
385 else
386 err = handler->dump_one(in_skb, nlh, req);
387 inet_diag_unlock_handler(handler);
388
389 return err;
390 }
391
392 static int bitstring_match(const __be32 *a1, const __be32 *a2, int bits)
393 {
394 int words = bits >> 5;
395
396 bits &= 0x1f;
397
398 if (words) {
399 if (memcmp(a1, a2, words << 2))
400 return 0;
401 }
402 if (bits) {
403 __be32 w1, w2;
404 __be32 mask;
405
406 w1 = a1[words];
407 w2 = a2[words];
408
409 mask = htonl((0xffffffff) << (32 - bits));
410
411 if ((w1 ^ w2) & mask)
412 return 0;
413 }
414
415 return 1;
416 }
417
418
419 static int inet_diag_bc_run(const struct nlattr *_bc,
420 const struct inet_diag_entry *entry)
421 {
422 const void *bc = nla_data(_bc);
423 int len = nla_len(_bc);
424
425 while (len > 0) {
426 int yes = 1;
427 const struct inet_diag_bc_op *op = bc;
428
429 switch (op->code) {
430 case INET_DIAG_BC_NOP:
431 break;
432 case INET_DIAG_BC_JMP:
433 yes = 0;
434 break;
435 case INET_DIAG_BC_S_GE:
436 yes = entry->sport >= op[1].no;
437 break;
438 case INET_DIAG_BC_S_LE:
439 yes = entry->sport <= op[1].no;
440 break;
441 case INET_DIAG_BC_D_GE:
442 yes = entry->dport >= op[1].no;
443 break;
444 case INET_DIAG_BC_D_LE:
445 yes = entry->dport <= op[1].no;
446 break;
447 case INET_DIAG_BC_AUTO:
448 yes = !(entry->userlocks & SOCK_BINDPORT_LOCK);
449 break;
450 case INET_DIAG_BC_S_COND:
451 case INET_DIAG_BC_D_COND: {
452 struct inet_diag_hostcond *cond;
453 __be32 *addr;
454
455 cond = (struct inet_diag_hostcond *)(op + 1);
456 if (cond->port != -1 &&
457 cond->port != (op->code == INET_DIAG_BC_S_COND ?
458 entry->sport : entry->dport)) {
459 yes = 0;
460 break;
461 }
462
463 if (op->code == INET_DIAG_BC_S_COND)
464 addr = entry->saddr;
465 else
466 addr = entry->daddr;
467
468 if (cond->family != AF_UNSPEC &&
469 cond->family != entry->family) {
470 if (entry->family == AF_INET6 &&
471 cond->family == AF_INET) {
472 if (addr[0] == 0 && addr[1] == 0 &&
473 addr[2] == htonl(0xffff) &&
474 bitstring_match(addr + 3,
475 cond->addr,
476 cond->prefix_len))
477 break;
478 }
479 yes = 0;
480 break;
481 }
482
483 if (cond->prefix_len == 0)
484 break;
485 if (bitstring_match(addr, cond->addr,
486 cond->prefix_len))
487 break;
488 yes = 0;
489 break;
490 }
491 }
492
493 if (yes) {
494 len -= op->yes;
495 bc += op->yes;
496 } else {
497 len -= op->no;
498 bc += op->no;
499 }
500 }
501 return len == 0;
502 }
503
504 int inet_diag_bc_sk(const struct nlattr *bc, struct sock *sk)
505 {
506 struct inet_diag_entry entry;
507 struct inet_sock *inet = inet_sk(sk);
508
509 if (bc == NULL)
510 return 1;
511
512 entry.family = sk->sk_family;
513 #if IS_ENABLED(CONFIG_IPV6)
514 if (entry.family == AF_INET6) {
515 struct ipv6_pinfo *np = inet6_sk(sk);
516
517 entry.saddr = np->rcv_saddr.s6_addr32;
518 entry.daddr = np->daddr.s6_addr32;
519 } else
520 #endif
521 {
522 entry.saddr = &inet->inet_rcv_saddr;
523 entry.daddr = &inet->inet_daddr;
524 }
525 entry.sport = inet->inet_num;
526 entry.dport = ntohs(inet->inet_dport);
527 entry.userlocks = sk->sk_userlocks;
528
529 return inet_diag_bc_run(bc, &entry);
530 }
531 EXPORT_SYMBOL_GPL(inet_diag_bc_sk);
532
533 static int valid_cc(const void *bc, int len, int cc)
534 {
535 while (len >= 0) {
536 const struct inet_diag_bc_op *op = bc;
537
538 if (cc > len)
539 return 0;
540 if (cc == len)
541 return 1;
542 if (op->yes < 4 || op->yes & 3)
543 return 0;
544 len -= op->yes;
545 bc += op->yes;
546 }
547 return 0;
548 }
549
550 /* Validate an inet_diag_hostcond. */
551 static bool valid_hostcond(const struct inet_diag_bc_op *op, int len,
552 int *min_len)
553 {
554 int addr_len;
555 struct inet_diag_hostcond *cond;
556
557 /* Check hostcond space. */
558 *min_len += sizeof(struct inet_diag_hostcond);
559 if (len < *min_len)
560 return false;
561 cond = (struct inet_diag_hostcond *)(op + 1);
562
563 /* Check address family and address length. */
564 switch (cond->family) {
565 case AF_UNSPEC:
566 addr_len = 0;
567 break;
568 case AF_INET:
569 addr_len = sizeof(struct in_addr);
570 break;
571 case AF_INET6:
572 addr_len = sizeof(struct in6_addr);
573 break;
574 default:
575 return false;
576 }
577 *min_len += addr_len;
578 if (len < *min_len)
579 return false;
580
581 /* Check prefix length (in bits) vs address length (in bytes). */
582 if (cond->prefix_len > 8 * addr_len)
583 return false;
584
585 return true;
586 }
587
588 /* Validate a port comparison operator. */
589 static inline bool valid_port_comparison(const struct inet_diag_bc_op *op,
590 int len, int *min_len)
591 {
592 /* Port comparisons put the port in a follow-on inet_diag_bc_op. */
593 *min_len += sizeof(struct inet_diag_bc_op);
594 if (len < *min_len)
595 return false;
596 return true;
597 }
598
599 static int inet_diag_bc_audit(const void *bytecode, int bytecode_len)
600 {
601 const void *bc = bytecode;
602 int len = bytecode_len;
603
604 while (len > 0) {
605 const struct inet_diag_bc_op *op = bc;
606 int min_len = sizeof(struct inet_diag_bc_op);
607
608 //printk("BC: %d %d %d {%d} / %d\n", op->code, op->yes, op->no, op[1].no, len);
609 switch (op->code) {
610 case INET_DIAG_BC_S_COND:
611 case INET_DIAG_BC_D_COND:
612 if (!valid_hostcond(bc, len, &min_len))
613 return -EINVAL;
614 break;
615 case INET_DIAG_BC_S_GE:
616 case INET_DIAG_BC_S_LE:
617 case INET_DIAG_BC_D_GE:
618 case INET_DIAG_BC_D_LE:
619 if (!valid_port_comparison(bc, len, &min_len))
620 return -EINVAL;
621 break;
622 case INET_DIAG_BC_AUTO:
623 case INET_DIAG_BC_JMP:
624 case INET_DIAG_BC_NOP:
625 break;
626 default:
627 return -EINVAL;
628 }
629
630 if (op->code != INET_DIAG_BC_NOP) {
631 if (op->no < min_len || op->no > len + 4 || op->no & 3)
632 return -EINVAL;
633 if (op->no < len &&
634 !valid_cc(bytecode, bytecode_len, len - op->no))
635 return -EINVAL;
636 }
637
638 if (op->yes < min_len || op->yes > len + 4 || op->yes & 3)
639 return -EINVAL;
640 bc += op->yes;
641 len -= op->yes;
642 }
643 return len == 0 ? 0 : -EINVAL;
644 }
645
646 static int inet_csk_diag_dump(struct sock *sk,
647 struct sk_buff *skb,
648 struct netlink_callback *cb,
649 struct inet_diag_req_v2 *r,
650 const struct nlattr *bc)
651 {
652 if (!inet_diag_bc_sk(bc, sk))
653 return 0;
654
655 return inet_csk_diag_fill(sk, skb, r,
656 sk_user_ns(NETLINK_CB(cb->skb).sk),
657 NETLINK_CB(cb->skb).portid,
658 cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh);
659 }
660
661 static int inet_twsk_diag_dump(struct inet_timewait_sock *tw,
662 struct sk_buff *skb,
663 struct netlink_callback *cb,
664 struct inet_diag_req_v2 *r,
665 const struct nlattr *bc)
666 {
667 if (bc != NULL) {
668 struct inet_diag_entry entry;
669
670 entry.family = tw->tw_family;
671 #if IS_ENABLED(CONFIG_IPV6)
672 if (tw->tw_family == AF_INET6) {
673 struct inet6_timewait_sock *tw6 =
674 inet6_twsk((struct sock *)tw);
675 entry.saddr = tw6->tw_v6_rcv_saddr.s6_addr32;
676 entry.daddr = tw6->tw_v6_daddr.s6_addr32;
677 } else
678 #endif
679 {
680 entry.saddr = &tw->tw_rcv_saddr;
681 entry.daddr = &tw->tw_daddr;
682 }
683 entry.sport = tw->tw_num;
684 entry.dport = ntohs(tw->tw_dport);
685 entry.userlocks = 0;
686
687 if (!inet_diag_bc_run(bc, &entry))
688 return 0;
689 }
690
691 return inet_twsk_diag_fill(tw, skb, r,
692 NETLINK_CB(cb->skb).portid,
693 cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh);
694 }
695
696 /* Get the IPv4, IPv6, or IPv4-mapped-IPv6 local and remote addresses
697 * from a request_sock. For IPv4-mapped-IPv6 we must map IPv4 to IPv6.
698 */
699 static inline void inet_diag_req_addrs(const struct sock *sk,
700 const struct request_sock *req,
701 struct inet_diag_entry *entry)
702 {
703 struct inet_request_sock *ireq = inet_rsk(req);
704
705 #if IS_ENABLED(CONFIG_IPV6)
706 if (sk->sk_family == AF_INET6) {
707 if (req->rsk_ops->family == AF_INET6) {
708 entry->saddr = inet6_rsk(req)->loc_addr.s6_addr32;
709 entry->daddr = inet6_rsk(req)->rmt_addr.s6_addr32;
710 } else if (req->rsk_ops->family == AF_INET) {
711 ipv6_addr_set_v4mapped(ireq->loc_addr,
712 &entry->saddr_storage);
713 ipv6_addr_set_v4mapped(ireq->rmt_addr,
714 &entry->daddr_storage);
715 entry->saddr = entry->saddr_storage.s6_addr32;
716 entry->daddr = entry->daddr_storage.s6_addr32;
717 }
718 } else
719 #endif
720 {
721 entry->saddr = &ireq->loc_addr;
722 entry->daddr = &ireq->rmt_addr;
723 }
724 }
725
726 static int inet_diag_fill_req(struct sk_buff *skb, struct sock *sk,
727 struct request_sock *req,
728 struct user_namespace *user_ns,
729 u32 portid, u32 seq,
730 const struct nlmsghdr *unlh)
731 {
732 const struct inet_request_sock *ireq = inet_rsk(req);
733 struct inet_sock *inet = inet_sk(sk);
734 struct inet_diag_msg *r;
735 struct nlmsghdr *nlh;
736 long tmo;
737
738 nlh = nlmsg_put(skb, portid, seq, unlh->nlmsg_type, sizeof(*r),
739 NLM_F_MULTI);
740 if (!nlh)
741 return -EMSGSIZE;
742
743 r = nlmsg_data(nlh);
744 r->idiag_family = sk->sk_family;
745 r->idiag_state = TCP_SYN_RECV;
746 r->idiag_timer = 1;
747 r->idiag_retrans = req->num_retrans;
748
749 r->id.idiag_if = sk->sk_bound_dev_if;
750 sock_diag_save_cookie(req, r->id.idiag_cookie);
751
752 tmo = req->expires - jiffies;
753 if (tmo < 0)
754 tmo = 0;
755
756 r->id.idiag_sport = inet->inet_sport;
757 r->id.idiag_dport = ireq->rmt_port;
758
759 memset(&r->id.idiag_src, 0, sizeof(r->id.idiag_src));
760 memset(&r->id.idiag_dst, 0, sizeof(r->id.idiag_dst));
761
762 r->id.idiag_src[0] = ireq->loc_addr;
763 r->id.idiag_dst[0] = ireq->rmt_addr;
764
765 r->idiag_expires = jiffies_to_msecs(tmo);
766 r->idiag_rqueue = 0;
767 r->idiag_wqueue = 0;
768 r->idiag_uid = from_kuid_munged(user_ns, sock_i_uid(sk));
769 r->idiag_inode = 0;
770 #if IS_ENABLED(CONFIG_IPV6)
771 if (r->idiag_family == AF_INET6) {
772 struct inet_diag_entry entry;
773 inet_diag_req_addrs(sk, req, &entry);
774 memcpy(r->id.idiag_src, entry.saddr, sizeof(struct in6_addr));
775 memcpy(r->id.idiag_dst, entry.daddr, sizeof(struct in6_addr));
776 }
777 #endif
778
779 return nlmsg_end(skb, nlh);
780 }
781
782 static int inet_diag_dump_reqs(struct sk_buff *skb, struct sock *sk,
783 struct netlink_callback *cb,
784 struct inet_diag_req_v2 *r,
785 const struct nlattr *bc)
786 {
787 struct inet_diag_entry entry;
788 struct inet_connection_sock *icsk = inet_csk(sk);
789 struct listen_sock *lopt;
790 struct inet_sock *inet = inet_sk(sk);
791 int j, s_j;
792 int reqnum, s_reqnum;
793 int err = 0;
794
795 s_j = cb->args[3];
796 s_reqnum = cb->args[4];
797
798 if (s_j > 0)
799 s_j--;
800
801 entry.family = sk->sk_family;
802
803 read_lock_bh(&icsk->icsk_accept_queue.syn_wait_lock);
804
805 lopt = icsk->icsk_accept_queue.listen_opt;
806 if (!lopt || !lopt->qlen)
807 goto out;
808
809 if (bc != NULL) {
810 entry.sport = inet->inet_num;
811 entry.userlocks = sk->sk_userlocks;
812 }
813
814 for (j = s_j; j < lopt->nr_table_entries; j++) {
815 struct request_sock *req, *head = lopt->syn_table[j];
816
817 reqnum = 0;
818 for (req = head; req; reqnum++, req = req->dl_next) {
819 struct inet_request_sock *ireq = inet_rsk(req);
820
821 if (reqnum < s_reqnum)
822 continue;
823 if (r->id.idiag_dport != ireq->rmt_port &&
824 r->id.idiag_dport)
825 continue;
826
827 if (bc) {
828 inet_diag_req_addrs(sk, req, &entry);
829 entry.dport = ntohs(ireq->rmt_port);
830
831 if (!inet_diag_bc_run(bc, &entry))
832 continue;
833 }
834
835 err = inet_diag_fill_req(skb, sk, req,
836 sk_user_ns(NETLINK_CB(cb->skb).sk),
837 NETLINK_CB(cb->skb).portid,
838 cb->nlh->nlmsg_seq, cb->nlh);
839 if (err < 0) {
840 cb->args[3] = j + 1;
841 cb->args[4] = reqnum;
842 goto out;
843 }
844 }
845
846 s_reqnum = 0;
847 }
848
849 out:
850 read_unlock_bh(&icsk->icsk_accept_queue.syn_wait_lock);
851
852 return err;
853 }
854
855 void inet_diag_dump_icsk(struct inet_hashinfo *hashinfo, struct sk_buff *skb,
856 struct netlink_callback *cb, struct inet_diag_req_v2 *r, struct nlattr *bc)
857 {
858 int i, num;
859 int s_i, s_num;
860 struct net *net = sock_net(skb->sk);
861
862 s_i = cb->args[1];
863 s_num = num = cb->args[2];
864
865 if (cb->args[0] == 0) {
866 if (!(r->idiag_states & (TCPF_LISTEN | TCPF_SYN_RECV)))
867 goto skip_listen_ht;
868
869 for (i = s_i; i < INET_LHTABLE_SIZE; i++) {
870 struct sock *sk;
871 struct hlist_nulls_node *node;
872 struct inet_listen_hashbucket *ilb;
873
874 num = 0;
875 ilb = &hashinfo->listening_hash[i];
876 spin_lock_bh(&ilb->lock);
877 sk_nulls_for_each(sk, node, &ilb->head) {
878 struct inet_sock *inet = inet_sk(sk);
879
880 if (!net_eq(sock_net(sk), net))
881 continue;
882
883 if (num < s_num) {
884 num++;
885 continue;
886 }
887
888 if (r->sdiag_family != AF_UNSPEC &&
889 sk->sk_family != r->sdiag_family)
890 goto next_listen;
891
892 if (r->id.idiag_sport != inet->inet_sport &&
893 r->id.idiag_sport)
894 goto next_listen;
895
896 if (!(r->idiag_states & TCPF_LISTEN) ||
897 r->id.idiag_dport ||
898 cb->args[3] > 0)
899 goto syn_recv;
900
901 if (inet_csk_diag_dump(sk, skb, cb, r, bc) < 0) {
902 spin_unlock_bh(&ilb->lock);
903 goto done;
904 }
905
906 syn_recv:
907 if (!(r->idiag_states & TCPF_SYN_RECV))
908 goto next_listen;
909
910 if (inet_diag_dump_reqs(skb, sk, cb, r, bc) < 0) {
911 spin_unlock_bh(&ilb->lock);
912 goto done;
913 }
914
915 next_listen:
916 cb->args[3] = 0;
917 cb->args[4] = 0;
918 ++num;
919 }
920 spin_unlock_bh(&ilb->lock);
921
922 s_num = 0;
923 cb->args[3] = 0;
924 cb->args[4] = 0;
925 }
926 skip_listen_ht:
927 cb->args[0] = 1;
928 s_i = num = s_num = 0;
929 }
930
931 if (!(r->idiag_states & ~(TCPF_LISTEN | TCPF_SYN_RECV)))
932 goto out;
933
934 for (i = s_i; i <= hashinfo->ehash_mask; i++) {
935 struct inet_ehash_bucket *head = &hashinfo->ehash[i];
936 spinlock_t *lock = inet_ehash_lockp(hashinfo, i);
937 struct sock *sk;
938 struct hlist_nulls_node *node;
939
940 num = 0;
941
942 if (hlist_nulls_empty(&head->chain) &&
943 hlist_nulls_empty(&head->twchain))
944 continue;
945
946 if (i > s_i)
947 s_num = 0;
948
949 spin_lock_bh(lock);
950 sk_nulls_for_each(sk, node, &head->chain) {
951 struct inet_sock *inet = inet_sk(sk);
952
953 if (!net_eq(sock_net(sk), net))
954 continue;
955 if (num < s_num)
956 goto next_normal;
957 if (!(r->idiag_states & (1 << sk->sk_state)))
958 goto next_normal;
959 if (r->sdiag_family != AF_UNSPEC &&
960 sk->sk_family != r->sdiag_family)
961 goto next_normal;
962 if (r->id.idiag_sport != inet->inet_sport &&
963 r->id.idiag_sport)
964 goto next_normal;
965 if (r->id.idiag_dport != inet->inet_dport &&
966 r->id.idiag_dport)
967 goto next_normal;
968 if (inet_csk_diag_dump(sk, skb, cb, r, bc) < 0) {
969 spin_unlock_bh(lock);
970 goto done;
971 }
972 next_normal:
973 ++num;
974 }
975
976 if (r->idiag_states & (TCPF_TIME_WAIT | TCPF_FIN_WAIT2)) {
977 struct inet_timewait_sock *tw;
978
979 inet_twsk_for_each(tw, node,
980 &head->twchain) {
981 if (!net_eq(twsk_net(tw), net))
982 continue;
983
984 if (num < s_num)
985 goto next_dying;
986 if (!(r->idiag_states & (1 << tw->tw_substate)))
987 goto next_dying;
988 if (r->sdiag_family != AF_UNSPEC &&
989 tw->tw_family != r->sdiag_family)
990 goto next_dying;
991 if (r->id.idiag_sport != tw->tw_sport &&
992 r->id.idiag_sport)
993 goto next_dying;
994 if (r->id.idiag_dport != tw->tw_dport &&
995 r->id.idiag_dport)
996 goto next_dying;
997 if (inet_twsk_diag_dump(tw, skb, cb, r, bc) < 0) {
998 spin_unlock_bh(lock);
999 goto done;
1000 }
1001 next_dying:
1002 ++num;
1003 }
1004 }
1005 spin_unlock_bh(lock);
1006 }
1007
1008 done:
1009 cb->args[1] = i;
1010 cb->args[2] = num;
1011 out:
1012 ;
1013 }
1014 EXPORT_SYMBOL_GPL(inet_diag_dump_icsk);
1015
1016 static int __inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb,
1017 struct inet_diag_req_v2 *r, struct nlattr *bc)
1018 {
1019 const struct inet_diag_handler *handler;
1020 int err = 0;
1021
1022 handler = inet_diag_lock_handler(r->sdiag_protocol);
1023 if (!IS_ERR(handler))
1024 handler->dump(skb, cb, r, bc);
1025 else
1026 err = PTR_ERR(handler);
1027 inet_diag_unlock_handler(handler);
1028
1029 return err ? : skb->len;
1030 }
1031
1032 static int inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb)
1033 {
1034 struct nlattr *bc = NULL;
1035 int hdrlen = sizeof(struct inet_diag_req_v2);
1036
1037 if (nlmsg_attrlen(cb->nlh, hdrlen))
1038 bc = nlmsg_find_attr(cb->nlh, hdrlen, INET_DIAG_REQ_BYTECODE);
1039
1040 return __inet_diag_dump(skb, cb, nlmsg_data(cb->nlh), bc);
1041 }
1042
1043 static inline int inet_diag_type2proto(int type)
1044 {
1045 switch (type) {
1046 case TCPDIAG_GETSOCK:
1047 return IPPROTO_TCP;
1048 case DCCPDIAG_GETSOCK:
1049 return IPPROTO_DCCP;
1050 default:
1051 return 0;
1052 }
1053 }
1054
1055 static int inet_diag_dump_compat(struct sk_buff *skb, struct netlink_callback *cb)
1056 {
1057 struct inet_diag_req *rc = nlmsg_data(cb->nlh);
1058 struct inet_diag_req_v2 req;
1059 struct nlattr *bc = NULL;
1060 int hdrlen = sizeof(struct inet_diag_req);
1061
1062 req.sdiag_family = AF_UNSPEC; /* compatibility */
1063 req.sdiag_protocol = inet_diag_type2proto(cb->nlh->nlmsg_type);
1064 req.idiag_ext = rc->idiag_ext;
1065 req.idiag_states = rc->idiag_states;
1066 req.id = rc->id;
1067
1068 if (nlmsg_attrlen(cb->nlh, hdrlen))
1069 bc = nlmsg_find_attr(cb->nlh, hdrlen, INET_DIAG_REQ_BYTECODE);
1070
1071 return __inet_diag_dump(skb, cb, &req, bc);
1072 }
1073
1074 static int inet_diag_get_exact_compat(struct sk_buff *in_skb,
1075 const struct nlmsghdr *nlh)
1076 {
1077 struct inet_diag_req *rc = nlmsg_data(nlh);
1078 struct inet_diag_req_v2 req;
1079
1080 req.sdiag_family = rc->idiag_family;
1081 req.sdiag_protocol = inet_diag_type2proto(nlh->nlmsg_type);
1082 req.idiag_ext = rc->idiag_ext;
1083 req.idiag_states = rc->idiag_states;
1084 req.id = rc->id;
1085
1086 return inet_diag_get_exact(in_skb, nlh, &req);
1087 }
1088
1089 static int inet_diag_rcv_msg_compat(struct sk_buff *skb, struct nlmsghdr *nlh)
1090 {
1091 int hdrlen = sizeof(struct inet_diag_req);
1092 struct net *net = sock_net(skb->sk);
1093
1094 if (nlh->nlmsg_type >= INET_DIAG_GETSOCK_MAX ||
1095 nlmsg_len(nlh) < hdrlen)
1096 return -EINVAL;
1097
1098 if (nlh->nlmsg_flags & NLM_F_DUMP) {
1099 if (nlmsg_attrlen(nlh, hdrlen)) {
1100 struct nlattr *attr;
1101
1102 attr = nlmsg_find_attr(nlh, hdrlen,
1103 INET_DIAG_REQ_BYTECODE);
1104 if (attr == NULL ||
1105 nla_len(attr) < sizeof(struct inet_diag_bc_op) ||
1106 inet_diag_bc_audit(nla_data(attr), nla_len(attr)))
1107 return -EINVAL;
1108 }
1109 {
1110 struct netlink_dump_control c = {
1111 .dump = inet_diag_dump_compat,
1112 };
1113 return netlink_dump_start(net->diag_nlsk, skb, nlh, &c);
1114 }
1115 }
1116
1117 return inet_diag_get_exact_compat(skb, nlh);
1118 }
1119
1120 static int inet_diag_handler_dump(struct sk_buff *skb, struct nlmsghdr *h)
1121 {
1122 int hdrlen = sizeof(struct inet_diag_req_v2);
1123 struct net *net = sock_net(skb->sk);
1124
1125 if (nlmsg_len(h) < hdrlen)
1126 return -EINVAL;
1127
1128 if (h->nlmsg_flags & NLM_F_DUMP) {
1129 if (nlmsg_attrlen(h, hdrlen)) {
1130 struct nlattr *attr;
1131 attr = nlmsg_find_attr(h, hdrlen,
1132 INET_DIAG_REQ_BYTECODE);
1133 if (attr == NULL ||
1134 nla_len(attr) < sizeof(struct inet_diag_bc_op) ||
1135 inet_diag_bc_audit(nla_data(attr), nla_len(attr)))
1136 return -EINVAL;
1137 }
1138 {
1139 struct netlink_dump_control c = {
1140 .dump = inet_diag_dump,
1141 };
1142 return netlink_dump_start(net->diag_nlsk, skb, h, &c);
1143 }
1144 }
1145
1146 return inet_diag_get_exact(skb, h, nlmsg_data(h));
1147 }
1148
1149 static const struct sock_diag_handler inet_diag_handler = {
1150 .family = AF_INET,
1151 .dump = inet_diag_handler_dump,
1152 };
1153
1154 static const struct sock_diag_handler inet6_diag_handler = {
1155 .family = AF_INET6,
1156 .dump = inet_diag_handler_dump,
1157 };
1158
1159 int inet_diag_register(const struct inet_diag_handler *h)
1160 {
1161 const __u16 type = h->idiag_type;
1162 int err = -EINVAL;
1163
1164 if (type >= IPPROTO_MAX)
1165 goto out;
1166
1167 mutex_lock(&inet_diag_table_mutex);
1168 err = -EEXIST;
1169 if (inet_diag_table[type] == NULL) {
1170 inet_diag_table[type] = h;
1171 err = 0;
1172 }
1173 mutex_unlock(&inet_diag_table_mutex);
1174 out:
1175 return err;
1176 }
1177 EXPORT_SYMBOL_GPL(inet_diag_register);
1178
1179 void inet_diag_unregister(const struct inet_diag_handler *h)
1180 {
1181 const __u16 type = h->idiag_type;
1182
1183 if (type >= IPPROTO_MAX)
1184 return;
1185
1186 mutex_lock(&inet_diag_table_mutex);
1187 inet_diag_table[type] = NULL;
1188 mutex_unlock(&inet_diag_table_mutex);
1189 }
1190 EXPORT_SYMBOL_GPL(inet_diag_unregister);
1191
1192 static int __init inet_diag_init(void)
1193 {
1194 const int inet_diag_table_size = (IPPROTO_MAX *
1195 sizeof(struct inet_diag_handler *));
1196 int err = -ENOMEM;
1197
1198 inet_diag_table = kzalloc(inet_diag_table_size, GFP_KERNEL);
1199 if (!inet_diag_table)
1200 goto out;
1201
1202 err = sock_diag_register(&inet_diag_handler);
1203 if (err)
1204 goto out_free_nl;
1205
1206 err = sock_diag_register(&inet6_diag_handler);
1207 if (err)
1208 goto out_free_inet;
1209
1210 sock_diag_register_inet_compat(inet_diag_rcv_msg_compat);
1211 out:
1212 return err;
1213
1214 out_free_inet:
1215 sock_diag_unregister(&inet_diag_handler);
1216 out_free_nl:
1217 kfree(inet_diag_table);
1218 goto out;
1219 }
1220
1221 static void __exit inet_diag_exit(void)
1222 {
1223 sock_diag_unregister(&inet6_diag_handler);
1224 sock_diag_unregister(&inet_diag_handler);
1225 sock_diag_unregister_inet_compat(inet_diag_rcv_msg_compat);
1226 kfree(inet_diag_table);
1227 }
1228
1229 module_init(inet_diag_init);
1230 module_exit(inet_diag_exit);
1231 MODULE_LICENSE("GPL");
1232 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 2 /* AF_INET */);
1233 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 10 /* AF_INET6 */);
Linux with added FPC-III support