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