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net: use IS_ENABLED(CONFIG_IPV6)
[GitHub/mt8127/android_kernel_alcatel_ttab.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", PF_NETLINK,
58 NETLINK_SOCK_DIAG, 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 *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 r->id.idiag_cookie[0] = (u32)(unsigned long)sk;
106 r->id.idiag_cookie[1] = (u32)(((unsigned long)sk >> 31) >> 1);
107
108 r->id.idiag_sport = inet->inet_sport;
109 r->id.idiag_dport = inet->inet_dport;
110 r->id.idiag_src[0] = inet->inet_rcv_saddr;
111 r->id.idiag_dst[0] = inet->inet_daddr;
112
113 /* IPv6 dual-stack sockets use inet->tos for IPv4 connections,
114 * hence this needs to be included regardless of socket family.
115 */
116 if (ext & (1 << (INET_DIAG_TOS - 1)))
117 RTA_PUT_U8(skb, INET_DIAG_TOS, inet->tos);
118
119 #if IS_ENABLED(CONFIG_IPV6)
120 if (r->idiag_family == AF_INET6) {
121 const struct ipv6_pinfo *np = inet6_sk(sk);
122
123 *(struct in6_addr *)r->id.idiag_src = np->rcv_saddr;
124 *(struct in6_addr *)r->id.idiag_dst = np->daddr;
125 if (ext & (1 << (INET_DIAG_TCLASS - 1)))
126 RTA_PUT_U8(skb, INET_DIAG_TCLASS, np->tclass);
127 }
128 #endif
129
130 r->idiag_uid = sock_i_uid(sk);
131 r->idiag_inode = sock_i_ino(sk);
132
133 if (minfo) {
134 minfo->idiag_rmem = sk_rmem_alloc_get(sk);
135 minfo->idiag_wmem = sk->sk_wmem_queued;
136 minfo->idiag_fmem = sk->sk_forward_alloc;
137 minfo->idiag_tmem = sk_wmem_alloc_get(sk);
138 }
139
140 if (icsk == NULL) {
141 r->idiag_rqueue = r->idiag_wqueue = 0;
142 goto out;
143 }
144
145 #define EXPIRES_IN_MS(tmo) DIV_ROUND_UP((tmo - jiffies) * 1000, HZ)
146
147 if (icsk->icsk_pending == ICSK_TIME_RETRANS) {
148 r->idiag_timer = 1;
149 r->idiag_retrans = icsk->icsk_retransmits;
150 r->idiag_expires = EXPIRES_IN_MS(icsk->icsk_timeout);
151 } else if (icsk->icsk_pending == ICSK_TIME_PROBE0) {
152 r->idiag_timer = 4;
153 r->idiag_retrans = icsk->icsk_probes_out;
154 r->idiag_expires = EXPIRES_IN_MS(icsk->icsk_timeout);
155 } else if (timer_pending(&sk->sk_timer)) {
156 r->idiag_timer = 2;
157 r->idiag_retrans = icsk->icsk_probes_out;
158 r->idiag_expires = EXPIRES_IN_MS(sk->sk_timer.expires);
159 } else {
160 r->idiag_timer = 0;
161 r->idiag_expires = 0;
162 }
163 #undef EXPIRES_IN_MS
164
165 if (ext & (1 << (INET_DIAG_INFO - 1)))
166 info = INET_DIAG_PUT(skb, INET_DIAG_INFO, sizeof(struct tcp_info));
167
168 if ((ext & (1 << (INET_DIAG_CONG - 1))) && icsk->icsk_ca_ops) {
169 const size_t len = strlen(icsk->icsk_ca_ops->name);
170
171 strcpy(INET_DIAG_PUT(skb, INET_DIAG_CONG, len + 1),
172 icsk->icsk_ca_ops->name);
173 }
174
175 handler->idiag_get_info(sk, r, info);
176
177 if (sk->sk_state < TCP_TIME_WAIT &&
178 icsk->icsk_ca_ops && icsk->icsk_ca_ops->get_info)
179 icsk->icsk_ca_ops->get_info(sk, ext, skb);
180
181 out:
182 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
183 return skb->len;
184
185 rtattr_failure:
186 nlmsg_failure:
187 nlmsg_trim(skb, b);
188 return -EMSGSIZE;
189 }
190 EXPORT_SYMBOL_GPL(inet_sk_diag_fill);
191
192 static int inet_csk_diag_fill(struct sock *sk,
193 struct sk_buff *skb, struct inet_diag_req *req,
194 u32 pid, u32 seq, u16 nlmsg_flags,
195 const struct nlmsghdr *unlh)
196 {
197 return inet_sk_diag_fill(sk, inet_csk(sk),
198 skb, req, pid, seq, nlmsg_flags, unlh);
199 }
200
201 static int inet_twsk_diag_fill(struct inet_timewait_sock *tw,
202 struct sk_buff *skb, struct inet_diag_req *req,
203 u32 pid, u32 seq, u16 nlmsg_flags,
204 const struct nlmsghdr *unlh)
205 {
206 long tmo;
207 struct inet_diag_msg *r;
208 const unsigned char *previous_tail = skb_tail_pointer(skb);
209 struct nlmsghdr *nlh = NLMSG_PUT(skb, pid, seq,
210 unlh->nlmsg_type, sizeof(*r));
211
212 r = NLMSG_DATA(nlh);
213 BUG_ON(tw->tw_state != TCP_TIME_WAIT);
214
215 nlh->nlmsg_flags = nlmsg_flags;
216
217 tmo = tw->tw_ttd - jiffies;
218 if (tmo < 0)
219 tmo = 0;
220
221 r->idiag_family = tw->tw_family;
222 r->idiag_retrans = 0;
223 r->id.idiag_if = tw->tw_bound_dev_if;
224 r->id.idiag_cookie[0] = (u32)(unsigned long)tw;
225 r->id.idiag_cookie[1] = (u32)(((unsigned long)tw >> 31) >> 1);
226 r->id.idiag_sport = tw->tw_sport;
227 r->id.idiag_dport = tw->tw_dport;
228 r->id.idiag_src[0] = tw->tw_rcv_saddr;
229 r->id.idiag_dst[0] = tw->tw_daddr;
230 r->idiag_state = tw->tw_substate;
231 r->idiag_timer = 3;
232 r->idiag_expires = DIV_ROUND_UP(tmo * 1000, HZ);
233 r->idiag_rqueue = 0;
234 r->idiag_wqueue = 0;
235 r->idiag_uid = 0;
236 r->idiag_inode = 0;
237 #if IS_ENABLED(CONFIG_IPV6)
238 if (tw->tw_family == AF_INET6) {
239 const struct inet6_timewait_sock *tw6 =
240 inet6_twsk((struct sock *)tw);
241
242 *(struct in6_addr *)r->id.idiag_src = tw6->tw_v6_rcv_saddr;
243 *(struct in6_addr *)r->id.idiag_dst = tw6->tw_v6_daddr;
244 }
245 #endif
246 nlh->nlmsg_len = skb_tail_pointer(skb) - previous_tail;
247 return skb->len;
248 nlmsg_failure:
249 nlmsg_trim(skb, previous_tail);
250 return -EMSGSIZE;
251 }
252
253 static int sk_diag_fill(struct sock *sk, struct sk_buff *skb,
254 struct inet_diag_req *r, u32 pid, u32 seq, u16 nlmsg_flags,
255 const struct nlmsghdr *unlh)
256 {
257 if (sk->sk_state == TCP_TIME_WAIT)
258 return inet_twsk_diag_fill((struct inet_timewait_sock *)sk,
259 skb, r, pid, seq, nlmsg_flags,
260 unlh);
261 return inet_csk_diag_fill(sk, skb, r, pid, seq, nlmsg_flags, unlh);
262 }
263
264 int inet_diag_check_cookie(struct sock *sk, struct inet_diag_req *req)
265 {
266 if ((req->id.idiag_cookie[0] != INET_DIAG_NOCOOKIE ||
267 req->id.idiag_cookie[1] != INET_DIAG_NOCOOKIE) &&
268 ((u32)(unsigned long)sk != req->id.idiag_cookie[0] ||
269 (u32)((((unsigned long)sk) >> 31) >> 1) != req->id.idiag_cookie[1]))
270 return -ESTALE;
271 else
272 return 0;
273 }
274 EXPORT_SYMBOL_GPL(inet_diag_check_cookie);
275
276 int inet_diag_dump_one_icsk(struct inet_hashinfo *hashinfo, struct sk_buff *in_skb,
277 const struct nlmsghdr *nlh, struct inet_diag_req *req)
278 {
279 int err;
280 struct sock *sk;
281 struct sk_buff *rep;
282
283 err = -EINVAL;
284 if (req->sdiag_family == AF_INET) {
285 sk = inet_lookup(&init_net, hashinfo, req->id.idiag_dst[0],
286 req->id.idiag_dport, req->id.idiag_src[0],
287 req->id.idiag_sport, req->id.idiag_if);
288 }
289 #if IS_ENABLED(CONFIG_IPV6)
290 else if (req->sdiag_family == AF_INET6) {
291 sk = inet6_lookup(&init_net, hashinfo,
292 (struct in6_addr *)req->id.idiag_dst,
293 req->id.idiag_dport,
294 (struct in6_addr *)req->id.idiag_src,
295 req->id.idiag_sport,
296 req->id.idiag_if);
297 }
298 #endif
299 else {
300 goto out_nosk;
301 }
302
303 err = -ENOENT;
304 if (sk == NULL)
305 goto out_nosk;
306
307 err = inet_diag_check_cookie(sk, req);
308 if (err)
309 goto out;
310
311 err = -ENOMEM;
312 rep = alloc_skb(NLMSG_SPACE((sizeof(struct inet_diag_msg) +
313 sizeof(struct inet_diag_meminfo) +
314 sizeof(struct tcp_info) + 64)),
315 GFP_KERNEL);
316 if (!rep)
317 goto out;
318
319 err = sk_diag_fill(sk, rep, req,
320 NETLINK_CB(in_skb).pid,
321 nlh->nlmsg_seq, 0, nlh);
322 if (err < 0) {
323 WARN_ON(err == -EMSGSIZE);
324 kfree_skb(rep);
325 goto out;
326 }
327 err = netlink_unicast(sock_diag_nlsk, rep, NETLINK_CB(in_skb).pid,
328 MSG_DONTWAIT);
329 if (err > 0)
330 err = 0;
331
332 out:
333 if (sk) {
334 if (sk->sk_state == TCP_TIME_WAIT)
335 inet_twsk_put((struct inet_timewait_sock *)sk);
336 else
337 sock_put(sk);
338 }
339 out_nosk:
340 return err;
341 }
342 EXPORT_SYMBOL_GPL(inet_diag_dump_one_icsk);
343
344 static int inet_diag_get_exact(struct sk_buff *in_skb,
345 const struct nlmsghdr *nlh,
346 struct inet_diag_req *req)
347 {
348 const struct inet_diag_handler *handler;
349 int err;
350
351 handler = inet_diag_lock_handler(req->sdiag_protocol);
352 if (IS_ERR(handler))
353 err = PTR_ERR(handler);
354 else
355 err = handler->dump_one(in_skb, nlh, req);
356 inet_diag_unlock_handler(handler);
357
358 return err;
359 }
360
361 static int bitstring_match(const __be32 *a1, const __be32 *a2, int bits)
362 {
363 int words = bits >> 5;
364
365 bits &= 0x1f;
366
367 if (words) {
368 if (memcmp(a1, a2, words << 2))
369 return 0;
370 }
371 if (bits) {
372 __be32 w1, w2;
373 __be32 mask;
374
375 w1 = a1[words];
376 w2 = a2[words];
377
378 mask = htonl((0xffffffff) << (32 - bits));
379
380 if ((w1 ^ w2) & mask)
381 return 0;
382 }
383
384 return 1;
385 }
386
387
388 static int inet_diag_bc_run(const struct nlattr *_bc,
389 const struct inet_diag_entry *entry)
390 {
391 const void *bc = nla_data(_bc);
392 int len = nla_len(_bc);
393
394 while (len > 0) {
395 int yes = 1;
396 const struct inet_diag_bc_op *op = bc;
397
398 switch (op->code) {
399 case INET_DIAG_BC_NOP:
400 break;
401 case INET_DIAG_BC_JMP:
402 yes = 0;
403 break;
404 case INET_DIAG_BC_S_GE:
405 yes = entry->sport >= op[1].no;
406 break;
407 case INET_DIAG_BC_S_LE:
408 yes = entry->sport <= op[1].no;
409 break;
410 case INET_DIAG_BC_D_GE:
411 yes = entry->dport >= op[1].no;
412 break;
413 case INET_DIAG_BC_D_LE:
414 yes = entry->dport <= op[1].no;
415 break;
416 case INET_DIAG_BC_AUTO:
417 yes = !(entry->userlocks & SOCK_BINDPORT_LOCK);
418 break;
419 case INET_DIAG_BC_S_COND:
420 case INET_DIAG_BC_D_COND: {
421 struct inet_diag_hostcond *cond;
422 __be32 *addr;
423
424 cond = (struct inet_diag_hostcond *)(op + 1);
425 if (cond->port != -1 &&
426 cond->port != (op->code == INET_DIAG_BC_S_COND ?
427 entry->sport : entry->dport)) {
428 yes = 0;
429 break;
430 }
431
432 if (cond->prefix_len == 0)
433 break;
434
435 if (op->code == INET_DIAG_BC_S_COND)
436 addr = entry->saddr;
437 else
438 addr = entry->daddr;
439
440 if (bitstring_match(addr, cond->addr,
441 cond->prefix_len))
442 break;
443 if (entry->family == AF_INET6 &&
444 cond->family == AF_INET) {
445 if (addr[0] == 0 && addr[1] == 0 &&
446 addr[2] == htonl(0xffff) &&
447 bitstring_match(addr + 3, cond->addr,
448 cond->prefix_len))
449 break;
450 }
451 yes = 0;
452 break;
453 }
454 }
455
456 if (yes) {
457 len -= op->yes;
458 bc += op->yes;
459 } else {
460 len -= op->no;
461 bc += op->no;
462 }
463 }
464 return len == 0;
465 }
466
467 int inet_diag_bc_sk(const struct nlattr *bc, struct sock *sk)
468 {
469 struct inet_diag_entry entry;
470 struct inet_sock *inet = inet_sk(sk);
471
472 if (bc == NULL)
473 return 1;
474
475 entry.family = sk->sk_family;
476 #if IS_ENABLED(CONFIG_IPV6)
477 if (entry.family == AF_INET6) {
478 struct ipv6_pinfo *np = inet6_sk(sk);
479
480 entry.saddr = np->rcv_saddr.s6_addr32;
481 entry.daddr = np->daddr.s6_addr32;
482 } else
483 #endif
484 {
485 entry.saddr = &inet->inet_rcv_saddr;
486 entry.daddr = &inet->inet_daddr;
487 }
488 entry.sport = inet->inet_num;
489 entry.dport = ntohs(inet->inet_dport);
490 entry.userlocks = sk->sk_userlocks;
491
492 return inet_diag_bc_run(bc, &entry);
493 }
494 EXPORT_SYMBOL_GPL(inet_diag_bc_sk);
495
496 static int valid_cc(const void *bc, int len, int cc)
497 {
498 while (len >= 0) {
499 const struct inet_diag_bc_op *op = bc;
500
501 if (cc > len)
502 return 0;
503 if (cc == len)
504 return 1;
505 if (op->yes < 4 || op->yes & 3)
506 return 0;
507 len -= op->yes;
508 bc += op->yes;
509 }
510 return 0;
511 }
512
513 static int inet_diag_bc_audit(const void *bytecode, int bytecode_len)
514 {
515 const void *bc = bytecode;
516 int len = bytecode_len;
517
518 while (len > 0) {
519 const struct inet_diag_bc_op *op = bc;
520
521 //printk("BC: %d %d %d {%d} / %d\n", op->code, op->yes, op->no, op[1].no, len);
522 switch (op->code) {
523 case INET_DIAG_BC_AUTO:
524 case INET_DIAG_BC_S_COND:
525 case INET_DIAG_BC_D_COND:
526 case INET_DIAG_BC_S_GE:
527 case INET_DIAG_BC_S_LE:
528 case INET_DIAG_BC_D_GE:
529 case INET_DIAG_BC_D_LE:
530 case INET_DIAG_BC_JMP:
531 if (op->no < 4 || op->no > len + 4 || op->no & 3)
532 return -EINVAL;
533 if (op->no < len &&
534 !valid_cc(bytecode, bytecode_len, len - op->no))
535 return -EINVAL;
536 break;
537 case INET_DIAG_BC_NOP:
538 break;
539 default:
540 return -EINVAL;
541 }
542 if (op->yes < 4 || op->yes > len + 4 || op->yes & 3)
543 return -EINVAL;
544 bc += op->yes;
545 len -= op->yes;
546 }
547 return len == 0 ? 0 : -EINVAL;
548 }
549
550 static int inet_csk_diag_dump(struct sock *sk,
551 struct sk_buff *skb,
552 struct netlink_callback *cb,
553 struct inet_diag_req *r,
554 const struct nlattr *bc)
555 {
556 if (!inet_diag_bc_sk(bc, sk))
557 return 0;
558
559 return inet_csk_diag_fill(sk, skb, r,
560 NETLINK_CB(cb->skb).pid,
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 *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).pid,
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, u32 pid, u32 seq,
601 const struct nlmsghdr *unlh)
602 {
603 const struct inet_request_sock *ireq = inet_rsk(req);
604 struct inet_sock *inet = inet_sk(sk);
605 unsigned char *b = skb_tail_pointer(skb);
606 struct inet_diag_msg *r;
607 struct nlmsghdr *nlh;
608 long tmo;
609
610 nlh = NLMSG_PUT(skb, pid, seq, unlh->nlmsg_type, sizeof(*r));
611 nlh->nlmsg_flags = NLM_F_MULTI;
612 r = NLMSG_DATA(nlh);
613
614 r->idiag_family = sk->sk_family;
615 r->idiag_state = TCP_SYN_RECV;
616 r->idiag_timer = 1;
617 r->idiag_retrans = req->retrans;
618
619 r->id.idiag_if = sk->sk_bound_dev_if;
620 r->id.idiag_cookie[0] = (u32)(unsigned long)req;
621 r->id.idiag_cookie[1] = (u32)(((unsigned long)req >> 31) >> 1);
622
623 tmo = req->expires - jiffies;
624 if (tmo < 0)
625 tmo = 0;
626
627 r->id.idiag_sport = inet->inet_sport;
628 r->id.idiag_dport = ireq->rmt_port;
629 r->id.idiag_src[0] = ireq->loc_addr;
630 r->id.idiag_dst[0] = ireq->rmt_addr;
631 r->idiag_expires = jiffies_to_msecs(tmo);
632 r->idiag_rqueue = 0;
633 r->idiag_wqueue = 0;
634 r->idiag_uid = sock_i_uid(sk);
635 r->idiag_inode = 0;
636 #if IS_ENABLED(CONFIG_IPV6)
637 if (r->idiag_family == AF_INET6) {
638 *(struct in6_addr *)r->id.idiag_src = inet6_rsk(req)->loc_addr;
639 *(struct in6_addr *)r->id.idiag_dst = inet6_rsk(req)->rmt_addr;
640 }
641 #endif
642 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
643
644 return skb->len;
645
646 nlmsg_failure:
647 nlmsg_trim(skb, b);
648 return -1;
649 }
650
651 static int inet_diag_dump_reqs(struct sk_buff *skb, struct sock *sk,
652 struct netlink_callback *cb,
653 struct inet_diag_req *r,
654 const struct nlattr *bc)
655 {
656 struct inet_diag_entry entry;
657 struct inet_connection_sock *icsk = inet_csk(sk);
658 struct listen_sock *lopt;
659 struct inet_sock *inet = inet_sk(sk);
660 int j, s_j;
661 int reqnum, s_reqnum;
662 int err = 0;
663
664 s_j = cb->args[3];
665 s_reqnum = cb->args[4];
666
667 if (s_j > 0)
668 s_j--;
669
670 entry.family = sk->sk_family;
671
672 read_lock_bh(&icsk->icsk_accept_queue.syn_wait_lock);
673
674 lopt = icsk->icsk_accept_queue.listen_opt;
675 if (!lopt || !lopt->qlen)
676 goto out;
677
678 if (bc != NULL) {
679 entry.sport = inet->inet_num;
680 entry.userlocks = sk->sk_userlocks;
681 }
682
683 for (j = s_j; j < lopt->nr_table_entries; j++) {
684 struct request_sock *req, *head = lopt->syn_table[j];
685
686 reqnum = 0;
687 for (req = head; req; reqnum++, req = req->dl_next) {
688 struct inet_request_sock *ireq = inet_rsk(req);
689
690 if (reqnum < s_reqnum)
691 continue;
692 if (r->id.idiag_dport != ireq->rmt_port &&
693 r->id.idiag_dport)
694 continue;
695
696 if (bc) {
697 entry.saddr =
698 #if IS_ENABLED(CONFIG_IPV6)
699 (entry.family == AF_INET6) ?
700 inet6_rsk(req)->loc_addr.s6_addr32 :
701 #endif
702 &ireq->loc_addr;
703 entry.daddr =
704 #if IS_ENABLED(CONFIG_IPV6)
705 (entry.family == AF_INET6) ?
706 inet6_rsk(req)->rmt_addr.s6_addr32 :
707 #endif
708 &ireq->rmt_addr;
709 entry.dport = ntohs(ireq->rmt_port);
710
711 if (!inet_diag_bc_run(bc, &entry))
712 continue;
713 }
714
715 err = inet_diag_fill_req(skb, sk, req,
716 NETLINK_CB(cb->skb).pid,
717 cb->nlh->nlmsg_seq, cb->nlh);
718 if (err < 0) {
719 cb->args[3] = j + 1;
720 cb->args[4] = reqnum;
721 goto out;
722 }
723 }
724
725 s_reqnum = 0;
726 }
727
728 out:
729 read_unlock_bh(&icsk->icsk_accept_queue.syn_wait_lock);
730
731 return err;
732 }
733
734 void inet_diag_dump_icsk(struct inet_hashinfo *hashinfo, struct sk_buff *skb,
735 struct netlink_callback *cb, struct inet_diag_req *r, struct nlattr *bc)
736 {
737 int i, num;
738 int s_i, s_num;
739
740 s_i = cb->args[1];
741 s_num = num = cb->args[2];
742
743 if (cb->args[0] == 0) {
744 if (!(r->idiag_states & (TCPF_LISTEN | TCPF_SYN_RECV)))
745 goto skip_listen_ht;
746
747 for (i = s_i; i < INET_LHTABLE_SIZE; i++) {
748 struct sock *sk;
749 struct hlist_nulls_node *node;
750 struct inet_listen_hashbucket *ilb;
751
752 num = 0;
753 ilb = &hashinfo->listening_hash[i];
754 spin_lock_bh(&ilb->lock);
755 sk_nulls_for_each(sk, node, &ilb->head) {
756 struct inet_sock *inet = inet_sk(sk);
757
758 if (num < s_num) {
759 num++;
760 continue;
761 }
762
763 if (r->sdiag_family != AF_UNSPEC &&
764 sk->sk_family != r->sdiag_family)
765 goto next_listen;
766
767 if (r->id.idiag_sport != inet->inet_sport &&
768 r->id.idiag_sport)
769 goto next_listen;
770
771 if (!(r->idiag_states & TCPF_LISTEN) ||
772 r->id.idiag_dport ||
773 cb->args[3] > 0)
774 goto syn_recv;
775
776 if (inet_csk_diag_dump(sk, skb, cb, r, bc) < 0) {
777 spin_unlock_bh(&ilb->lock);
778 goto done;
779 }
780
781 syn_recv:
782 if (!(r->idiag_states & TCPF_SYN_RECV))
783 goto next_listen;
784
785 if (inet_diag_dump_reqs(skb, sk, cb, r, bc) < 0) {
786 spin_unlock_bh(&ilb->lock);
787 goto done;
788 }
789
790 next_listen:
791 cb->args[3] = 0;
792 cb->args[4] = 0;
793 ++num;
794 }
795 spin_unlock_bh(&ilb->lock);
796
797 s_num = 0;
798 cb->args[3] = 0;
799 cb->args[4] = 0;
800 }
801 skip_listen_ht:
802 cb->args[0] = 1;
803 s_i = num = s_num = 0;
804 }
805
806 if (!(r->idiag_states & ~(TCPF_LISTEN | TCPF_SYN_RECV)))
807 goto out;
808
809 for (i = s_i; i <= hashinfo->ehash_mask; i++) {
810 struct inet_ehash_bucket *head = &hashinfo->ehash[i];
811 spinlock_t *lock = inet_ehash_lockp(hashinfo, i);
812 struct sock *sk;
813 struct hlist_nulls_node *node;
814
815 num = 0;
816
817 if (hlist_nulls_empty(&head->chain) &&
818 hlist_nulls_empty(&head->twchain))
819 continue;
820
821 if (i > s_i)
822 s_num = 0;
823
824 spin_lock_bh(lock);
825 sk_nulls_for_each(sk, node, &head->chain) {
826 struct inet_sock *inet = inet_sk(sk);
827
828 if (num < s_num)
829 goto next_normal;
830 if (!(r->idiag_states & (1 << sk->sk_state)))
831 goto next_normal;
832 if (r->sdiag_family != AF_UNSPEC &&
833 sk->sk_family != r->sdiag_family)
834 goto next_normal;
835 if (r->id.idiag_sport != inet->inet_sport &&
836 r->id.idiag_sport)
837 goto next_normal;
838 if (r->id.idiag_dport != inet->inet_dport &&
839 r->id.idiag_dport)
840 goto next_normal;
841 if (inet_csk_diag_dump(sk, skb, cb, r, bc) < 0) {
842 spin_unlock_bh(lock);
843 goto done;
844 }
845 next_normal:
846 ++num;
847 }
848
849 if (r->idiag_states & TCPF_TIME_WAIT) {
850 struct inet_timewait_sock *tw;
851
852 inet_twsk_for_each(tw, node,
853 &head->twchain) {
854
855 if (num < s_num)
856 goto next_dying;
857 if (r->sdiag_family != AF_UNSPEC &&
858 tw->tw_family != r->sdiag_family)
859 goto next_dying;
860 if (r->id.idiag_sport != tw->tw_sport &&
861 r->id.idiag_sport)
862 goto next_dying;
863 if (r->id.idiag_dport != tw->tw_dport &&
864 r->id.idiag_dport)
865 goto next_dying;
866 if (inet_twsk_diag_dump(tw, skb, cb, r, bc) < 0) {
867 spin_unlock_bh(lock);
868 goto done;
869 }
870 next_dying:
871 ++num;
872 }
873 }
874 spin_unlock_bh(lock);
875 }
876
877 done:
878 cb->args[1] = i;
879 cb->args[2] = num;
880 out:
881 ;
882 }
883 EXPORT_SYMBOL_GPL(inet_diag_dump_icsk);
884
885 static int __inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb,
886 struct inet_diag_req *r, struct nlattr *bc)
887 {
888 const struct inet_diag_handler *handler;
889
890 handler = inet_diag_lock_handler(r->sdiag_protocol);
891 if (!IS_ERR(handler))
892 handler->dump(skb, cb, r, bc);
893 inet_diag_unlock_handler(handler);
894
895 return skb->len;
896 }
897
898 static int inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb)
899 {
900 struct nlattr *bc = NULL;
901 int hdrlen = sizeof(struct inet_diag_req);
902
903 if (nlmsg_attrlen(cb->nlh, hdrlen))
904 bc = nlmsg_find_attr(cb->nlh, hdrlen, INET_DIAG_REQ_BYTECODE);
905
906 return __inet_diag_dump(skb, cb, (struct inet_diag_req *)NLMSG_DATA(cb->nlh), bc);
907 }
908
909 static inline int inet_diag_type2proto(int type)
910 {
911 switch (type) {
912 case TCPDIAG_GETSOCK:
913 return IPPROTO_TCP;
914 case DCCPDIAG_GETSOCK:
915 return IPPROTO_DCCP;
916 default:
917 return 0;
918 }
919 }
920
921 static int inet_diag_dump_compat(struct sk_buff *skb, struct netlink_callback *cb)
922 {
923 struct inet_diag_req_compat *rc = NLMSG_DATA(cb->nlh);
924 struct inet_diag_req req;
925 struct nlattr *bc = NULL;
926 int hdrlen = sizeof(struct inet_diag_req_compat);
927
928 req.sdiag_family = AF_UNSPEC; /* compatibility */
929 req.sdiag_protocol = inet_diag_type2proto(cb->nlh->nlmsg_type);
930 req.idiag_ext = rc->idiag_ext;
931 req.idiag_states = rc->idiag_states;
932 req.id = rc->id;
933
934 if (nlmsg_attrlen(cb->nlh, hdrlen))
935 bc = nlmsg_find_attr(cb->nlh, hdrlen, INET_DIAG_REQ_BYTECODE);
936
937 return __inet_diag_dump(skb, cb, &req, bc);
938 }
939
940 static int inet_diag_get_exact_compat(struct sk_buff *in_skb,
941 const struct nlmsghdr *nlh)
942 {
943 struct inet_diag_req_compat *rc = NLMSG_DATA(nlh);
944 struct inet_diag_req req;
945
946 req.sdiag_family = rc->idiag_family;
947 req.sdiag_protocol = inet_diag_type2proto(nlh->nlmsg_type);
948 req.idiag_ext = rc->idiag_ext;
949 req.idiag_states = rc->idiag_states;
950 req.id = rc->id;
951
952 return inet_diag_get_exact(in_skb, nlh, &req);
953 }
954
955 static int inet_diag_rcv_msg_compat(struct sk_buff *skb, struct nlmsghdr *nlh)
956 {
957 int hdrlen = sizeof(struct inet_diag_req_compat);
958
959 if (nlh->nlmsg_type >= INET_DIAG_GETSOCK_MAX ||
960 nlmsg_len(nlh) < hdrlen)
961 return -EINVAL;
962
963 if (nlh->nlmsg_flags & NLM_F_DUMP) {
964 if (nlmsg_attrlen(nlh, hdrlen)) {
965 struct nlattr *attr;
966
967 attr = nlmsg_find_attr(nlh, hdrlen,
968 INET_DIAG_REQ_BYTECODE);
969 if (attr == NULL ||
970 nla_len(attr) < sizeof(struct inet_diag_bc_op) ||
971 inet_diag_bc_audit(nla_data(attr), nla_len(attr)))
972 return -EINVAL;
973 }
974
975 return netlink_dump_start(sock_diag_nlsk, skb, nlh,
976 inet_diag_dump_compat, NULL, 0);
977 }
978
979 return inet_diag_get_exact_compat(skb, nlh);
980 }
981
982 static int inet_diag_handler_dump(struct sk_buff *skb, struct nlmsghdr *h)
983 {
984 int hdrlen = sizeof(struct inet_diag_req);
985
986 if (nlmsg_len(h) < hdrlen)
987 return -EINVAL;
988
989 if (h->nlmsg_flags & NLM_F_DUMP) {
990 if (nlmsg_attrlen(h, hdrlen)) {
991 struct nlattr *attr;
992 attr = nlmsg_find_attr(h, hdrlen,
993 INET_DIAG_REQ_BYTECODE);
994 if (attr == NULL ||
995 nla_len(attr) < sizeof(struct inet_diag_bc_op) ||
996 inet_diag_bc_audit(nla_data(attr), nla_len(attr)))
997 return -EINVAL;
998 }
999
1000 return netlink_dump_start(sock_diag_nlsk, skb, h,
1001 inet_diag_dump, NULL, 0);
1002 }
1003
1004 return inet_diag_get_exact(skb, h, (struct inet_diag_req *)NLMSG_DATA(h));
1005 }
1006
1007 static struct sock_diag_handler inet_diag_handler = {
1008 .family = AF_INET,
1009 .dump = inet_diag_handler_dump,
1010 };
1011
1012 static struct sock_diag_handler inet6_diag_handler = {
1013 .family = AF_INET6,
1014 .dump = inet_diag_handler_dump,
1015 };
1016
1017 int inet_diag_register(const struct inet_diag_handler *h)
1018 {
1019 const __u16 type = h->idiag_type;
1020 int err = -EINVAL;
1021
1022 if (type >= IPPROTO_MAX)
1023 goto out;
1024
1025 mutex_lock(&inet_diag_table_mutex);
1026 err = -EEXIST;
1027 if (inet_diag_table[type] == NULL) {
1028 inet_diag_table[type] = h;
1029 err = 0;
1030 }
1031 mutex_unlock(&inet_diag_table_mutex);
1032 out:
1033 return err;
1034 }
1035 EXPORT_SYMBOL_GPL(inet_diag_register);
1036
1037 void inet_diag_unregister(const struct inet_diag_handler *h)
1038 {
1039 const __u16 type = h->idiag_type;
1040
1041 if (type >= IPPROTO_MAX)
1042 return;
1043
1044 mutex_lock(&inet_diag_table_mutex);
1045 inet_diag_table[type] = NULL;
1046 mutex_unlock(&inet_diag_table_mutex);
1047 }
1048 EXPORT_SYMBOL_GPL(inet_diag_unregister);
1049
1050 static int __init inet_diag_init(void)
1051 {
1052 const int inet_diag_table_size = (IPPROTO_MAX *
1053 sizeof(struct inet_diag_handler *));
1054 int err = -ENOMEM;
1055
1056 inet_diag_table = kzalloc(inet_diag_table_size, GFP_KERNEL);
1057 if (!inet_diag_table)
1058 goto out;
1059
1060 err = sock_diag_register(&inet_diag_handler);
1061 if (err)
1062 goto out_free_nl;
1063
1064 err = sock_diag_register(&inet6_diag_handler);
1065 if (err)
1066 goto out_free_inet;
1067
1068 sock_diag_register_inet_compat(inet_diag_rcv_msg_compat);
1069 out:
1070 return err;
1071
1072 out_free_inet:
1073 sock_diag_unregister(&inet_diag_handler);
1074 out_free_nl:
1075 kfree(inet_diag_table);
1076 goto out;
1077 }
1078
1079 static void __exit inet_diag_exit(void)
1080 {
1081 sock_diag_unregister(&inet6_diag_handler);
1082 sock_diag_unregister(&inet_diag_handler);
1083 sock_diag_unregister_inet_compat(inet_diag_rcv_msg_compat);
1084 kfree(inet_diag_table);
1085 }
1086
1087 module_init(inet_diag_init);
1088 module_exit(inet_diag_exit);
1089 MODULE_LICENSE("GPL");
1090 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 0);
kernel source for telekom puls (alcatel/mediatek)