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Linux/net/ipv4/inet_diag.c

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  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         const __be32 *saddr;
 42         const __be32 *daddr;
 43         u16 sport;
 44         u16 dport;
 45         u16 family;
 46         u16 userlocks;
 47 };
 48 
 49 static DEFINE_MUTEX(inet_diag_table_mutex);
 50 
 51 static const struct inet_diag_handler *inet_diag_lock_handler(int proto)
 52 {
 53         if (!inet_diag_table[proto])
 54                 request_module("net-pf-%d-proto-%d-type-%d-%d", PF_NETLINK,
 55                                NETLINK_SOCK_DIAG, AF_INET, proto);
 56 
 57         mutex_lock(&inet_diag_table_mutex);
 58         if (!inet_diag_table[proto])
 59                 return ERR_PTR(-ENOENT);
 60 
 61         return inet_diag_table[proto];
 62 }
 63 
 64 static void inet_diag_unlock_handler(const struct inet_diag_handler *handler)
 65 {
 66         mutex_unlock(&inet_diag_table_mutex);
 67 }
 68 
 69 static void inet_diag_msg_common_fill(struct inet_diag_msg *r, struct sock *sk)
 70 {
 71         r->idiag_family = sk->sk_family;
 72 
 73         r->id.idiag_sport = htons(sk->sk_num);
 74         r->id.idiag_dport = sk->sk_dport;
 75         r->id.idiag_if = sk->sk_bound_dev_if;
 76         sock_diag_save_cookie(sk, r->id.idiag_cookie);
 77 
 78 #if IS_ENABLED(CONFIG_IPV6)
 79         if (sk->sk_family == AF_INET6) {
 80                 *(struct in6_addr *)r->id.idiag_src = sk->sk_v6_rcv_saddr;
 81                 *(struct in6_addr *)r->id.idiag_dst = sk->sk_v6_daddr;
 82         } else
 83 #endif
 84         {
 85         memset(&r->id.idiag_src, 0, sizeof(r->id.idiag_src));
 86         memset(&r->id.idiag_dst, 0, sizeof(r->id.idiag_dst));
 87 
 88         r->id.idiag_src[0] = sk->sk_rcv_saddr;
 89         r->id.idiag_dst[0] = sk->sk_daddr;
 90         }
 91 }
 92 
 93 static size_t inet_sk_attr_size(void)
 94 {
 95         return    nla_total_size(sizeof(struct tcp_info))
 96                 + nla_total_size(1) /* INET_DIAG_SHUTDOWN */
 97                 + nla_total_size(1) /* INET_DIAG_TOS */
 98                 + nla_total_size(1) /* INET_DIAG_TCLASS */
 99                 + nla_total_size(sizeof(struct inet_diag_meminfo))
100                 + nla_total_size(sizeof(struct inet_diag_msg))
101                 + nla_total_size(SK_MEMINFO_VARS * sizeof(u32))
102                 + nla_total_size(TCP_CA_NAME_MAX)
103                 + nla_total_size(sizeof(struct tcpvegas_info))
104                 + 64;
105 }
106 
107 int inet_sk_diag_fill(struct sock *sk, struct inet_connection_sock *icsk,
108                       struct sk_buff *skb, const struct inet_diag_req_v2 *req,
109                       struct user_namespace *user_ns,
110                       u32 portid, u32 seq, u16 nlmsg_flags,
111                       const struct nlmsghdr *unlh)
112 {
113         const struct inet_sock *inet = inet_sk(sk);
114         const struct tcp_congestion_ops *ca_ops;
115         const struct inet_diag_handler *handler;
116         int ext = req->idiag_ext;
117         struct inet_diag_msg *r;
118         struct nlmsghdr  *nlh;
119         struct nlattr *attr;
120         void *info = NULL;
121 
122         handler = inet_diag_table[req->sdiag_protocol];
123         BUG_ON(!handler);
124 
125         nlh = nlmsg_put(skb, portid, seq, unlh->nlmsg_type, sizeof(*r),
126                         nlmsg_flags);
127         if (!nlh)
128                 return -EMSGSIZE;
129 
130         r = nlmsg_data(nlh);
131         BUG_ON(!sk_fullsock(sk));
132 
133         inet_diag_msg_common_fill(r, sk);
134         r->idiag_state = sk->sk_state;
135         r->idiag_timer = 0;
136         r->idiag_retrans = 0;
137 
138         if (nla_put_u8(skb, INET_DIAG_SHUTDOWN, sk->sk_shutdown))
139                 goto errout;
140 
141         /* IPv6 dual-stack sockets use inet->tos for IPv4 connections,
142          * hence this needs to be included regardless of socket family.
143          */
144         if (ext & (1 << (INET_DIAG_TOS - 1)))
145                 if (nla_put_u8(skb, INET_DIAG_TOS, inet->tos) < 0)
146                         goto errout;
147 
148 #if IS_ENABLED(CONFIG_IPV6)
149         if (r->idiag_family == AF_INET6) {
150                 if (ext & (1 << (INET_DIAG_TCLASS - 1)))
151                         if (nla_put_u8(skb, INET_DIAG_TCLASS,
152                                        inet6_sk(sk)->tclass) < 0)
153                                 goto errout;
154 
155                 if (((1 << sk->sk_state) & (TCPF_LISTEN | TCPF_CLOSE)) &&
156                     nla_put_u8(skb, INET_DIAG_SKV6ONLY, ipv6_only_sock(sk)))
157                         goto errout;
158         }
159 #endif
160 
161         r->idiag_uid = from_kuid_munged(user_ns, sock_i_uid(sk));
162         r->idiag_inode = sock_i_ino(sk);
163 
164         if (ext & (1 << (INET_DIAG_MEMINFO - 1))) {
165                 struct inet_diag_meminfo minfo = {
166                         .idiag_rmem = sk_rmem_alloc_get(sk),
167                         .idiag_wmem = sk->sk_wmem_queued,
168                         .idiag_fmem = sk->sk_forward_alloc,
169                         .idiag_tmem = sk_wmem_alloc_get(sk),
170                 };
171 
172                 if (nla_put(skb, INET_DIAG_MEMINFO, sizeof(minfo), &minfo) < 0)
173                         goto errout;
174         }
175 
176         if (ext & (1 << (INET_DIAG_SKMEMINFO - 1)))
177                 if (sock_diag_put_meminfo(sk, skb, INET_DIAG_SKMEMINFO))
178                         goto errout;
179 
180         if (!icsk) {
181                 handler->idiag_get_info(sk, r, NULL);
182                 goto out;
183         }
184 
185 #define EXPIRES_IN_MS(tmo)  DIV_ROUND_UP((tmo - jiffies) * 1000, HZ)
186 
187         if (icsk->icsk_pending == ICSK_TIME_RETRANS ||
188             icsk->icsk_pending == ICSK_TIME_EARLY_RETRANS ||
189             icsk->icsk_pending == ICSK_TIME_LOSS_PROBE) {
190                 r->idiag_timer = 1;
191                 r->idiag_retrans = icsk->icsk_retransmits;
192                 r->idiag_expires = EXPIRES_IN_MS(icsk->icsk_timeout);
193         } else if (icsk->icsk_pending == ICSK_TIME_PROBE0) {
194                 r->idiag_timer = 4;
195                 r->idiag_retrans = icsk->icsk_probes_out;
196                 r->idiag_expires = EXPIRES_IN_MS(icsk->icsk_timeout);
197         } else if (timer_pending(&sk->sk_timer)) {
198                 r->idiag_timer = 2;
199                 r->idiag_retrans = icsk->icsk_probes_out;
200                 r->idiag_expires = EXPIRES_IN_MS(sk->sk_timer.expires);
201         } else {
202                 r->idiag_timer = 0;
203                 r->idiag_expires = 0;
204         }
205 #undef EXPIRES_IN_MS
206 
207         if ((ext & (1 << (INET_DIAG_INFO - 1))) && handler->idiag_info_size) {
208                 attr = nla_reserve(skb, INET_DIAG_INFO,
209                                    handler->idiag_info_size);
210                 if (!attr)
211                         goto errout;
212 
213                 info = nla_data(attr);
214         }
215 
216         if (ext & (1 << (INET_DIAG_CONG - 1))) {
217                 int err = 0;
218 
219                 rcu_read_lock();
220                 ca_ops = READ_ONCE(icsk->icsk_ca_ops);
221                 if (ca_ops)
222                         err = nla_put_string(skb, INET_DIAG_CONG, ca_ops->name);
223                 rcu_read_unlock();
224                 if (err < 0)
225                         goto errout;
226         }
227 
228         handler->idiag_get_info(sk, r, info);
229 
230         if (sk->sk_state < TCP_TIME_WAIT) {
231                 union tcp_cc_info info;
232                 size_t sz = 0;
233                 int attr;
234 
235                 rcu_read_lock();
236                 ca_ops = READ_ONCE(icsk->icsk_ca_ops);
237                 if (ca_ops && ca_ops->get_info)
238                         sz = ca_ops->get_info(sk, ext, &attr, &info);
239                 rcu_read_unlock();
240                 if (sz && nla_put(skb, attr, sz, &info) < 0)
241                         goto errout;
242         }
243 
244 out:
245         nlmsg_end(skb, nlh);
246         return 0;
247 
248 errout:
249         nlmsg_cancel(skb, nlh);
250         return -EMSGSIZE;
251 }
252 EXPORT_SYMBOL_GPL(inet_sk_diag_fill);
253 
254 static int inet_csk_diag_fill(struct sock *sk,
255                               struct sk_buff *skb,
256                               const struct inet_diag_req_v2 *req,
257                               struct user_namespace *user_ns,
258                               u32 portid, u32 seq, u16 nlmsg_flags,
259                               const struct nlmsghdr *unlh)
260 {
261         return inet_sk_diag_fill(sk, inet_csk(sk), skb, req,
262                                  user_ns, portid, seq, nlmsg_flags, unlh);
263 }
264 
265 static int inet_twsk_diag_fill(struct sock *sk,
266                                struct sk_buff *skb,
267                                u32 portid, u32 seq, u16 nlmsg_flags,
268                                const struct nlmsghdr *unlh)
269 {
270         struct inet_timewait_sock *tw = inet_twsk(sk);
271         struct inet_diag_msg *r;
272         struct nlmsghdr *nlh;
273         long tmo;
274 
275         nlh = nlmsg_put(skb, portid, seq, unlh->nlmsg_type, sizeof(*r),
276                         nlmsg_flags);
277         if (!nlh)
278                 return -EMSGSIZE;
279 
280         r = nlmsg_data(nlh);
281         BUG_ON(tw->tw_state != TCP_TIME_WAIT);
282 
283         tmo = tw->tw_timer.expires - jiffies;
284         if (tmo < 0)
285                 tmo = 0;
286 
287         inet_diag_msg_common_fill(r, sk);
288         r->idiag_retrans      = 0;
289 
290         r->idiag_state        = tw->tw_substate;
291         r->idiag_timer        = 3;
292         r->idiag_expires      = jiffies_to_msecs(tmo);
293         r->idiag_rqueue       = 0;
294         r->idiag_wqueue       = 0;
295         r->idiag_uid          = 0;
296         r->idiag_inode        = 0;
297 
298         nlmsg_end(skb, nlh);
299         return 0;
300 }
301 
302 static int inet_req_diag_fill(struct sock *sk, struct sk_buff *skb,
303                               u32 portid, u32 seq, u16 nlmsg_flags,
304                               const struct nlmsghdr *unlh)
305 {
306         struct inet_diag_msg *r;
307         struct nlmsghdr *nlh;
308         long tmo;
309 
310         nlh = nlmsg_put(skb, portid, seq, unlh->nlmsg_type, sizeof(*r),
311                         nlmsg_flags);
312         if (!nlh)
313                 return -EMSGSIZE;
314 
315         r = nlmsg_data(nlh);
316         inet_diag_msg_common_fill(r, sk);
317         r->idiag_state = TCP_SYN_RECV;
318         r->idiag_timer = 1;
319         r->idiag_retrans = inet_reqsk(sk)->num_retrans;
320 
321         BUILD_BUG_ON(offsetof(struct inet_request_sock, ir_cookie) !=
322                      offsetof(struct sock, sk_cookie));
323 
324         tmo = inet_reqsk(sk)->rsk_timer.expires - jiffies;
325         r->idiag_expires = (tmo >= 0) ? jiffies_to_msecs(tmo) : 0;
326         r->idiag_rqueue = 0;
327         r->idiag_wqueue = 0;
328         r->idiag_uid    = 0;
329         r->idiag_inode  = 0;
330 
331         nlmsg_end(skb, nlh);
332         return 0;
333 }
334 
335 static int sk_diag_fill(struct sock *sk, struct sk_buff *skb,
336                         const struct inet_diag_req_v2 *r,
337                         struct user_namespace *user_ns,
338                         u32 portid, u32 seq, u16 nlmsg_flags,
339                         const struct nlmsghdr *unlh)
340 {
341         if (sk->sk_state == TCP_TIME_WAIT)
342                 return inet_twsk_diag_fill(sk, skb, portid, seq,
343                                            nlmsg_flags, unlh);
344 
345         if (sk->sk_state == TCP_NEW_SYN_RECV)
346                 return inet_req_diag_fill(sk, skb, portid, seq,
347                                           nlmsg_flags, unlh);
348 
349         return inet_csk_diag_fill(sk, skb, r, user_ns, portid, seq,
350                                   nlmsg_flags, unlh);
351 }
352 
353 struct sock *inet_diag_find_one_icsk(struct net *net,
354                                      struct inet_hashinfo *hashinfo,
355                                      const struct inet_diag_req_v2 *req)
356 {
357         struct sock *sk;
358 
359         if (req->sdiag_family == AF_INET)
360                 sk = inet_lookup(net, hashinfo, NULL, 0, req->id.idiag_dst[0],
361                                  req->id.idiag_dport, req->id.idiag_src[0],
362                                  req->id.idiag_sport, req->id.idiag_if);
363 #if IS_ENABLED(CONFIG_IPV6)
364         else if (req->sdiag_family == AF_INET6) {
365                 if (ipv6_addr_v4mapped((struct in6_addr *)req->id.idiag_dst) &&
366                     ipv6_addr_v4mapped((struct in6_addr *)req->id.idiag_src))
367                         sk = inet_lookup(net, hashinfo, NULL, 0, req->id.idiag_dst[3],
368                                          req->id.idiag_dport, req->id.idiag_src[3],
369                                          req->id.idiag_sport, req->id.idiag_if);
370                 else
371                         sk = inet6_lookup(net, hashinfo, NULL, 0,
372                                           (struct in6_addr *)req->id.idiag_dst,
373                                           req->id.idiag_dport,
374                                           (struct in6_addr *)req->id.idiag_src,
375                                           req->id.idiag_sport,
376                                           req->id.idiag_if);
377         }
378 #endif
379         else
380                 return ERR_PTR(-EINVAL);
381 
382         if (!sk)
383                 return ERR_PTR(-ENOENT);
384 
385         if (sock_diag_check_cookie(sk, req->id.idiag_cookie)) {
386                 sock_gen_put(sk);
387                 return ERR_PTR(-ENOENT);
388         }
389 
390         return sk;
391 }
392 EXPORT_SYMBOL_GPL(inet_diag_find_one_icsk);
393 
394 int inet_diag_dump_one_icsk(struct inet_hashinfo *hashinfo,
395                             struct sk_buff *in_skb,
396                             const struct nlmsghdr *nlh,
397                             const struct inet_diag_req_v2 *req)
398 {
399         struct net *net = sock_net(in_skb->sk);
400         struct sk_buff *rep;
401         struct sock *sk;
402         int err;
403 
404         sk = inet_diag_find_one_icsk(net, hashinfo, req);
405         if (IS_ERR(sk))
406                 return PTR_ERR(sk);
407 
408         rep = nlmsg_new(inet_sk_attr_size(), GFP_KERNEL);
409         if (!rep) {
410                 err = -ENOMEM;
411                 goto out;
412         }
413 
414         err = sk_diag_fill(sk, rep, req,
415                            sk_user_ns(NETLINK_CB(in_skb).sk),
416                            NETLINK_CB(in_skb).portid,
417                            nlh->nlmsg_seq, 0, nlh);
418         if (err < 0) {
419                 WARN_ON(err == -EMSGSIZE);
420                 nlmsg_free(rep);
421                 goto out;
422         }
423         err = netlink_unicast(net->diag_nlsk, rep, NETLINK_CB(in_skb).portid,
424                               MSG_DONTWAIT);
425         if (err > 0)
426                 err = 0;
427 
428 out:
429         if (sk)
430                 sock_gen_put(sk);
431 
432         return err;
433 }
434 EXPORT_SYMBOL_GPL(inet_diag_dump_one_icsk);
435 
436 static int inet_diag_cmd_exact(int cmd, struct sk_buff *in_skb,
437                                const struct nlmsghdr *nlh,
438                                const struct inet_diag_req_v2 *req)
439 {
440         const struct inet_diag_handler *handler;
441         int err;
442 
443         handler = inet_diag_lock_handler(req->sdiag_protocol);
444         if (IS_ERR(handler))
445                 err = PTR_ERR(handler);
446         else if (cmd == SOCK_DIAG_BY_FAMILY)
447                 err = handler->dump_one(in_skb, nlh, req);
448         else if (cmd == SOCK_DESTROY && handler->destroy)
449                 err = handler->destroy(in_skb, req);
450         else
451                 err = -EOPNOTSUPP;
452         inet_diag_unlock_handler(handler);
453 
454         return err;
455 }
456 
457 static int bitstring_match(const __be32 *a1, const __be32 *a2, int bits)
458 {
459         int words = bits >> 5;
460 
461         bits &= 0x1f;
462 
463         if (words) {
464                 if (memcmp(a1, a2, words << 2))
465                         return 0;
466         }
467         if (bits) {
468                 __be32 w1, w2;
469                 __be32 mask;
470 
471                 w1 = a1[words];
472                 w2 = a2[words];
473 
474                 mask = htonl((0xffffffff) << (32 - bits));
475 
476                 if ((w1 ^ w2) & mask)
477                         return 0;
478         }
479 
480         return 1;
481 }
482 
483 static int inet_diag_bc_run(const struct nlattr *_bc,
484                             const struct inet_diag_entry *entry)
485 {
486         const void *bc = nla_data(_bc);
487         int len = nla_len(_bc);
488 
489         while (len > 0) {
490                 int yes = 1;
491                 const struct inet_diag_bc_op *op = bc;
492 
493                 switch (op->code) {
494                 case INET_DIAG_BC_NOP:
495                         break;
496                 case INET_DIAG_BC_JMP:
497                         yes = 0;
498                         break;
499                 case INET_DIAG_BC_S_GE:
500                         yes = entry->sport >= op[1].no;
501                         break;
502                 case INET_DIAG_BC_S_LE:
503                         yes = entry->sport <= op[1].no;
504                         break;
505                 case INET_DIAG_BC_D_GE:
506                         yes = entry->dport >= op[1].no;
507                         break;
508                 case INET_DIAG_BC_D_LE:
509                         yes = entry->dport <= op[1].no;
510                         break;
511                 case INET_DIAG_BC_AUTO:
512                         yes = !(entry->userlocks & SOCK_BINDPORT_LOCK);
513                         break;
514                 case INET_DIAG_BC_S_COND:
515                 case INET_DIAG_BC_D_COND: {
516                         const struct inet_diag_hostcond *cond;
517                         const __be32 *addr;
518 
519                         cond = (const struct inet_diag_hostcond *)(op + 1);
520                         if (cond->port != -1 &&
521                             cond->port != (op->code == INET_DIAG_BC_S_COND ?
522                                              entry->sport : entry->dport)) {
523                                 yes = 0;
524                                 break;
525                         }
526 
527                         if (op->code == INET_DIAG_BC_S_COND)
528                                 addr = entry->saddr;
529                         else
530                                 addr = entry->daddr;
531 
532                         if (cond->family != AF_UNSPEC &&
533                             cond->family != entry->family) {
534                                 if (entry->family == AF_INET6 &&
535                                     cond->family == AF_INET) {
536                                         if (addr[0] == 0 && addr[1] == 0 &&
537                                             addr[2] == htonl(0xffff) &&
538                                             bitstring_match(addr + 3,
539                                                             cond->addr,
540                                                             cond->prefix_len))
541                                                 break;
542                                 }
543                                 yes = 0;
544                                 break;
545                         }
546 
547                         if (cond->prefix_len == 0)
548                                 break;
549                         if (bitstring_match(addr, cond->addr,
550                                             cond->prefix_len))
551                                 break;
552                         yes = 0;
553                         break;
554                 }
555                 }
556 
557                 if (yes) {
558                         len -= op->yes;
559                         bc += op->yes;
560                 } else {
561                         len -= op->no;
562                         bc += op->no;
563                 }
564         }
565         return len == 0;
566 }
567 
568 /* This helper is available for all sockets (ESTABLISH, TIMEWAIT, SYN_RECV)
569  */
570 static void entry_fill_addrs(struct inet_diag_entry *entry,
571                              const struct sock *sk)
572 {
573 #if IS_ENABLED(CONFIG_IPV6)
574         if (sk->sk_family == AF_INET6) {
575                 entry->saddr = sk->sk_v6_rcv_saddr.s6_addr32;
576                 entry->daddr = sk->sk_v6_daddr.s6_addr32;
577         } else
578 #endif
579         {
580                 entry->saddr = &sk->sk_rcv_saddr;
581                 entry->daddr = &sk->sk_daddr;
582         }
583 }
584 
585 int inet_diag_bc_sk(const struct nlattr *bc, struct sock *sk)
586 {
587         struct inet_sock *inet = inet_sk(sk);
588         struct inet_diag_entry entry;
589 
590         if (!bc)
591                 return 1;
592 
593         entry.family = sk->sk_family;
594         entry_fill_addrs(&entry, sk);
595         entry.sport = inet->inet_num;
596         entry.dport = ntohs(inet->inet_dport);
597         entry.userlocks = sk_fullsock(sk) ? sk->sk_userlocks : 0;
598 
599         return inet_diag_bc_run(bc, &entry);
600 }
601 EXPORT_SYMBOL_GPL(inet_diag_bc_sk);
602 
603 static int valid_cc(const void *bc, int len, int cc)
604 {
605         while (len >= 0) {
606                 const struct inet_diag_bc_op *op = bc;
607 
608                 if (cc > len)
609                         return 0;
610                 if (cc == len)
611                         return 1;
612                 if (op->yes < 4 || op->yes & 3)
613                         return 0;
614                 len -= op->yes;
615                 bc  += op->yes;
616         }
617         return 0;
618 }
619 
620 /* Validate an inet_diag_hostcond. */
621 static bool valid_hostcond(const struct inet_diag_bc_op *op, int len,
622                            int *min_len)
623 {
624         struct inet_diag_hostcond *cond;
625         int addr_len;
626 
627         /* Check hostcond space. */
628         *min_len += sizeof(struct inet_diag_hostcond);
629         if (len < *min_len)
630                 return false;
631         cond = (struct inet_diag_hostcond *)(op + 1);
632 
633         /* Check address family and address length. */
634         switch (cond->family) {
635         case AF_UNSPEC:
636                 addr_len = 0;
637                 break;
638         case AF_INET:
639                 addr_len = sizeof(struct in_addr);
640                 break;
641         case AF_INET6:
642                 addr_len = sizeof(struct in6_addr);
643                 break;
644         default:
645                 return false;
646         }
647         *min_len += addr_len;
648         if (len < *min_len)
649                 return false;
650 
651         /* Check prefix length (in bits) vs address length (in bytes). */
652         if (cond->prefix_len > 8 * addr_len)
653                 return false;
654 
655         return true;
656 }
657 
658 /* Validate a port comparison operator. */
659 static bool valid_port_comparison(const struct inet_diag_bc_op *op,
660                                   int len, int *min_len)
661 {
662         /* Port comparisons put the port in a follow-on inet_diag_bc_op. */
663         *min_len += sizeof(struct inet_diag_bc_op);
664         if (len < *min_len)
665                 return false;
666         return true;
667 }
668 
669 static int inet_diag_bc_audit(const void *bytecode, int bytecode_len)
670 {
671         const void *bc = bytecode;
672         int  len = bytecode_len;
673 
674         while (len > 0) {
675                 int min_len = sizeof(struct inet_diag_bc_op);
676                 const struct inet_diag_bc_op *op = bc;
677 
678                 switch (op->code) {
679                 case INET_DIAG_BC_S_COND:
680                 case INET_DIAG_BC_D_COND:
681                         if (!valid_hostcond(bc, len, &min_len))
682                                 return -EINVAL;
683                         break;
684                 case INET_DIAG_BC_S_GE:
685                 case INET_DIAG_BC_S_LE:
686                 case INET_DIAG_BC_D_GE:
687                 case INET_DIAG_BC_D_LE:
688                         if (!valid_port_comparison(bc, len, &min_len))
689                                 return -EINVAL;
690                         break;
691                 case INET_DIAG_BC_AUTO:
692                 case INET_DIAG_BC_JMP:
693                 case INET_DIAG_BC_NOP:
694                         break;
695                 default:
696                         return -EINVAL;
697                 }
698 
699                 if (op->code != INET_DIAG_BC_NOP) {
700                         if (op->no < min_len || op->no > len + 4 || op->no & 3)
701                                 return -EINVAL;
702                         if (op->no < len &&
703                             !valid_cc(bytecode, bytecode_len, len - op->no))
704                                 return -EINVAL;
705                 }
706 
707                 if (op->yes < min_len || op->yes > len + 4 || op->yes & 3)
708                         return -EINVAL;
709                 bc  += op->yes;
710                 len -= op->yes;
711         }
712         return len == 0 ? 0 : -EINVAL;
713 }
714 
715 static int inet_csk_diag_dump(struct sock *sk,
716                               struct sk_buff *skb,
717                               struct netlink_callback *cb,
718                               const struct inet_diag_req_v2 *r,
719                               const struct nlattr *bc)
720 {
721         if (!inet_diag_bc_sk(bc, sk))
722                 return 0;
723 
724         return inet_csk_diag_fill(sk, skb, r,
725                                   sk_user_ns(NETLINK_CB(cb->skb).sk),
726                                   NETLINK_CB(cb->skb).portid,
727                                   cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh);
728 }
729 
730 static void twsk_build_assert(void)
731 {
732         BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_family) !=
733                      offsetof(struct sock, sk_family));
734 
735         BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_num) !=
736                      offsetof(struct inet_sock, inet_num));
737 
738         BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_dport) !=
739                      offsetof(struct inet_sock, inet_dport));
740 
741         BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_rcv_saddr) !=
742                      offsetof(struct inet_sock, inet_rcv_saddr));
743 
744         BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_daddr) !=
745                      offsetof(struct inet_sock, inet_daddr));
746 
747 #if IS_ENABLED(CONFIG_IPV6)
748         BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_v6_rcv_saddr) !=
749                      offsetof(struct sock, sk_v6_rcv_saddr));
750 
751         BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_v6_daddr) !=
752                      offsetof(struct sock, sk_v6_daddr));
753 #endif
754 }
755 
756 void inet_diag_dump_icsk(struct inet_hashinfo *hashinfo, struct sk_buff *skb,
757                          struct netlink_callback *cb,
758                          const struct inet_diag_req_v2 *r, struct nlattr *bc)
759 {
760         struct net *net = sock_net(skb->sk);
761         int i, num, s_i, s_num;
762         u32 idiag_states = r->idiag_states;
763 
764         if (idiag_states & TCPF_SYN_RECV)
765                 idiag_states |= TCPF_NEW_SYN_RECV;
766         s_i = cb->args[1];
767         s_num = num = cb->args[2];
768 
769         if (cb->args[0] == 0) {
770                 if (!(idiag_states & TCPF_LISTEN))
771                         goto skip_listen_ht;
772 
773                 for (i = s_i; i < INET_LHTABLE_SIZE; i++) {
774                         struct inet_listen_hashbucket *ilb;
775                         struct hlist_nulls_node *node;
776                         struct sock *sk;
777 
778                         num = 0;
779                         ilb = &hashinfo->listening_hash[i];
780                         spin_lock_bh(&ilb->lock);
781                         sk_nulls_for_each(sk, node, &ilb->head) {
782                                 struct inet_sock *inet = inet_sk(sk);
783 
784                                 if (!net_eq(sock_net(sk), net))
785                                         continue;
786 
787                                 if (num < s_num) {
788                                         num++;
789                                         continue;
790                                 }
791 
792                                 if (r->sdiag_family != AF_UNSPEC &&
793                                     sk->sk_family != r->sdiag_family)
794                                         goto next_listen;
795 
796                                 if (r->id.idiag_sport != inet->inet_sport &&
797                                     r->id.idiag_sport)
798                                         goto next_listen;
799 
800                                 if (r->id.idiag_dport ||
801                                     cb->args[3] > 0)
802                                         goto next_listen;
803 
804                                 if (inet_csk_diag_dump(sk, skb, cb, r, bc) < 0) {
805                                         spin_unlock_bh(&ilb->lock);
806                                         goto done;
807                                 }
808 
809 next_listen:
810                                 cb->args[3] = 0;
811                                 cb->args[4] = 0;
812                                 ++num;
813                         }
814                         spin_unlock_bh(&ilb->lock);
815 
816                         s_num = 0;
817                         cb->args[3] = 0;
818                         cb->args[4] = 0;
819                 }
820 skip_listen_ht:
821                 cb->args[0] = 1;
822                 s_i = num = s_num = 0;
823         }
824 
825         if (!(idiag_states & ~TCPF_LISTEN))
826                 goto out;
827 
828         for (i = s_i; i <= hashinfo->ehash_mask; i++) {
829                 struct inet_ehash_bucket *head = &hashinfo->ehash[i];
830                 spinlock_t *lock = inet_ehash_lockp(hashinfo, i);
831                 struct hlist_nulls_node *node;
832                 struct sock *sk;
833 
834                 num = 0;
835 
836                 if (hlist_nulls_empty(&head->chain))
837                         continue;
838 
839                 if (i > s_i)
840                         s_num = 0;
841 
842                 spin_lock_bh(lock);
843                 sk_nulls_for_each(sk, node, &head->chain) {
844                         int state, res;
845 
846                         if (!net_eq(sock_net(sk), net))
847                                 continue;
848                         if (num < s_num)
849                                 goto next_normal;
850                         state = (sk->sk_state == TCP_TIME_WAIT) ?
851                                 inet_twsk(sk)->tw_substate : sk->sk_state;
852                         if (!(idiag_states & (1 << state)))
853                                 goto next_normal;
854                         if (r->sdiag_family != AF_UNSPEC &&
855                             sk->sk_family != r->sdiag_family)
856                                 goto next_normal;
857                         if (r->id.idiag_sport != htons(sk->sk_num) &&
858                             r->id.idiag_sport)
859                                 goto next_normal;
860                         if (r->id.idiag_dport != sk->sk_dport &&
861                             r->id.idiag_dport)
862                                 goto next_normal;
863                         twsk_build_assert();
864 
865                         if (!inet_diag_bc_sk(bc, sk))
866                                 goto next_normal;
867 
868                         res = sk_diag_fill(sk, skb, r,
869                                            sk_user_ns(NETLINK_CB(cb->skb).sk),
870                                            NETLINK_CB(cb->skb).portid,
871                                            cb->nlh->nlmsg_seq, NLM_F_MULTI,
872                                            cb->nlh);
873                         if (res < 0) {
874                                 spin_unlock_bh(lock);
875                                 goto done;
876                         }
877 next_normal:
878                         ++num;
879                 }
880 
881                 spin_unlock_bh(lock);
882                 cond_resched();
883         }
884 
885 done:
886         cb->args[1] = i;
887         cb->args[2] = num;
888 out:
889         ;
890 }
891 EXPORT_SYMBOL_GPL(inet_diag_dump_icsk);
892 
893 static int __inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb,
894                             const struct inet_diag_req_v2 *r,
895                             struct nlattr *bc)
896 {
897         const struct inet_diag_handler *handler;
898         int err = 0;
899 
900         handler = inet_diag_lock_handler(r->sdiag_protocol);
901         if (!IS_ERR(handler))
902                 handler->dump(skb, cb, r, bc);
903         else
904                 err = PTR_ERR(handler);
905         inet_diag_unlock_handler(handler);
906 
907         return err ? : skb->len;
908 }
909 
910 static int inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb)
911 {
912         int hdrlen = sizeof(struct inet_diag_req_v2);
913         struct nlattr *bc = NULL;
914 
915         if (nlmsg_attrlen(cb->nlh, hdrlen))
916                 bc = nlmsg_find_attr(cb->nlh, hdrlen, INET_DIAG_REQ_BYTECODE);
917 
918         return __inet_diag_dump(skb, cb, nlmsg_data(cb->nlh), bc);
919 }
920 
921 static int inet_diag_type2proto(int type)
922 {
923         switch (type) {
924         case TCPDIAG_GETSOCK:
925                 return IPPROTO_TCP;
926         case DCCPDIAG_GETSOCK:
927                 return IPPROTO_DCCP;
928         default:
929                 return 0;
930         }
931 }
932 
933 static int inet_diag_dump_compat(struct sk_buff *skb,
934                                  struct netlink_callback *cb)
935 {
936         struct inet_diag_req *rc = nlmsg_data(cb->nlh);
937         int hdrlen = sizeof(struct inet_diag_req);
938         struct inet_diag_req_v2 req;
939         struct nlattr *bc = NULL;
940 
941         req.sdiag_family = AF_UNSPEC; /* compatibility */
942         req.sdiag_protocol = inet_diag_type2proto(cb->nlh->nlmsg_type);
943         req.idiag_ext = rc->idiag_ext;
944         req.idiag_states = rc->idiag_states;
945         req.id = rc->id;
946 
947         if (nlmsg_attrlen(cb->nlh, hdrlen))
948                 bc = nlmsg_find_attr(cb->nlh, hdrlen, INET_DIAG_REQ_BYTECODE);
949 
950         return __inet_diag_dump(skb, cb, &req, bc);
951 }
952 
953 static int inet_diag_get_exact_compat(struct sk_buff *in_skb,
954                                       const struct nlmsghdr *nlh)
955 {
956         struct inet_diag_req *rc = nlmsg_data(nlh);
957         struct inet_diag_req_v2 req;
958 
959         req.sdiag_family = rc->idiag_family;
960         req.sdiag_protocol = inet_diag_type2proto(nlh->nlmsg_type);
961         req.idiag_ext = rc->idiag_ext;
962         req.idiag_states = rc->idiag_states;
963         req.id = rc->id;
964 
965         return inet_diag_cmd_exact(SOCK_DIAG_BY_FAMILY, in_skb, nlh, &req);
966 }
967 
968 static int inet_diag_rcv_msg_compat(struct sk_buff *skb, struct nlmsghdr *nlh)
969 {
970         int hdrlen = sizeof(struct inet_diag_req);
971         struct net *net = sock_net(skb->sk);
972 
973         if (nlh->nlmsg_type >= INET_DIAG_GETSOCK_MAX ||
974             nlmsg_len(nlh) < hdrlen)
975                 return -EINVAL;
976 
977         if (nlh->nlmsg_flags & NLM_F_DUMP) {
978                 if (nlmsg_attrlen(nlh, hdrlen)) {
979                         struct nlattr *attr;
980 
981                         attr = nlmsg_find_attr(nlh, hdrlen,
982                                                INET_DIAG_REQ_BYTECODE);
983                         if (!attr ||
984                             nla_len(attr) < sizeof(struct inet_diag_bc_op) ||
985                             inet_diag_bc_audit(nla_data(attr), nla_len(attr)))
986                                 return -EINVAL;
987                 }
988                 {
989                         struct netlink_dump_control c = {
990                                 .dump = inet_diag_dump_compat,
991                         };
992                         return netlink_dump_start(net->diag_nlsk, skb, nlh, &c);
993                 }
994         }
995 
996         return inet_diag_get_exact_compat(skb, nlh);
997 }
998 
999 static int inet_diag_handler_cmd(struct sk_buff *skb, struct nlmsghdr *h)
1000 {
1001         int hdrlen = sizeof(struct inet_diag_req_v2);
1002         struct net *net = sock_net(skb->sk);
1003 
1004         if (nlmsg_len(h) < hdrlen)
1005                 return -EINVAL;
1006 
1007         if (h->nlmsg_type == SOCK_DIAG_BY_FAMILY &&
1008             h->nlmsg_flags & NLM_F_DUMP) {
1009                 if (nlmsg_attrlen(h, hdrlen)) {
1010                         struct nlattr *attr;
1011 
1012                         attr = nlmsg_find_attr(h, hdrlen,
1013                                                INET_DIAG_REQ_BYTECODE);
1014                         if (!attr ||
1015                             nla_len(attr) < sizeof(struct inet_diag_bc_op) ||
1016                             inet_diag_bc_audit(nla_data(attr), nla_len(attr)))
1017                                 return -EINVAL;
1018                 }
1019                 {
1020                         struct netlink_dump_control c = {
1021                                 .dump = inet_diag_dump,
1022                         };
1023                         return netlink_dump_start(net->diag_nlsk, skb, h, &c);
1024                 }
1025         }
1026 
1027         return inet_diag_cmd_exact(h->nlmsg_type, skb, h, nlmsg_data(h));
1028 }
1029 
1030 static
1031 int inet_diag_handler_get_info(struct sk_buff *skb, struct sock *sk)
1032 {
1033         const struct inet_diag_handler *handler;
1034         struct nlmsghdr *nlh;
1035         struct nlattr *attr;
1036         struct inet_diag_msg *r;
1037         void *info = NULL;
1038         int err = 0;
1039 
1040         nlh = nlmsg_put(skb, 0, 0, SOCK_DIAG_BY_FAMILY, sizeof(*r), 0);
1041         if (!nlh)
1042                 return -ENOMEM;
1043 
1044         r = nlmsg_data(nlh);
1045         memset(r, 0, sizeof(*r));
1046         inet_diag_msg_common_fill(r, sk);
1047         if (sk->sk_type == SOCK_DGRAM || sk->sk_type == SOCK_STREAM)
1048                 r->id.idiag_sport = inet_sk(sk)->inet_sport;
1049         r->idiag_state = sk->sk_state;
1050 
1051         if ((err = nla_put_u8(skb, INET_DIAG_PROTOCOL, sk->sk_protocol))) {
1052                 nlmsg_cancel(skb, nlh);
1053                 return err;
1054         }
1055 
1056         handler = inet_diag_lock_handler(sk->sk_protocol);
1057         if (IS_ERR(handler)) {
1058                 inet_diag_unlock_handler(handler);
1059                 nlmsg_cancel(skb, nlh);
1060                 return PTR_ERR(handler);
1061         }
1062 
1063         attr = handler->idiag_info_size
1064                 ? nla_reserve(skb, INET_DIAG_INFO, handler->idiag_info_size)
1065                 : NULL;
1066         if (attr)
1067                 info = nla_data(attr);
1068 
1069         handler->idiag_get_info(sk, r, info);
1070         inet_diag_unlock_handler(handler);
1071 
1072         nlmsg_end(skb, nlh);
1073         return 0;
1074 }
1075 
1076 static const struct sock_diag_handler inet_diag_handler = {
1077         .family = AF_INET,
1078         .dump = inet_diag_handler_cmd,
1079         .get_info = inet_diag_handler_get_info,
1080         .destroy = inet_diag_handler_cmd,
1081 };
1082 
1083 static const struct sock_diag_handler inet6_diag_handler = {
1084         .family = AF_INET6,
1085         .dump = inet_diag_handler_cmd,
1086         .get_info = inet_diag_handler_get_info,
1087         .destroy = inet_diag_handler_cmd,
1088 };
1089 
1090 int inet_diag_register(const struct inet_diag_handler *h)
1091 {
1092         const __u16 type = h->idiag_type;
1093         int err = -EINVAL;
1094 
1095         if (type >= IPPROTO_MAX)
1096                 goto out;
1097 
1098         mutex_lock(&inet_diag_table_mutex);
1099         err = -EEXIST;
1100         if (!inet_diag_table[type]) {
1101                 inet_diag_table[type] = h;
1102                 err = 0;
1103         }
1104         mutex_unlock(&inet_diag_table_mutex);
1105 out:
1106         return err;
1107 }
1108 EXPORT_SYMBOL_GPL(inet_diag_register);
1109 
1110 void inet_diag_unregister(const struct inet_diag_handler *h)
1111 {
1112         const __u16 type = h->idiag_type;
1113 
1114         if (type >= IPPROTO_MAX)
1115                 return;
1116 
1117         mutex_lock(&inet_diag_table_mutex);
1118         inet_diag_table[type] = NULL;
1119         mutex_unlock(&inet_diag_table_mutex);
1120 }
1121 EXPORT_SYMBOL_GPL(inet_diag_unregister);
1122 
1123 static int __init inet_diag_init(void)
1124 {
1125         const int inet_diag_table_size = (IPPROTO_MAX *
1126                                           sizeof(struct inet_diag_handler *));
1127         int err = -ENOMEM;
1128 
1129         inet_diag_table = kzalloc(inet_diag_table_size, GFP_KERNEL);
1130         if (!inet_diag_table)
1131                 goto out;
1132 
1133         err = sock_diag_register(&inet_diag_handler);
1134         if (err)
1135                 goto out_free_nl;
1136 
1137         err = sock_diag_register(&inet6_diag_handler);
1138         if (err)
1139                 goto out_free_inet;
1140 
1141         sock_diag_register_inet_compat(inet_diag_rcv_msg_compat);
1142 out:
1143         return err;
1144 
1145 out_free_inet:
1146         sock_diag_unregister(&inet_diag_handler);
1147 out_free_nl:
1148         kfree(inet_diag_table);
1149         goto out;
1150 }
1151 
1152 static void __exit inet_diag_exit(void)
1153 {
1154         sock_diag_unregister(&inet6_diag_handler);
1155         sock_diag_unregister(&inet_diag_handler);
1156         sock_diag_unregister_inet_compat(inet_diag_rcv_msg_compat);
1157         kfree(inet_diag_table);
1158 }
1159 
1160 module_init(inet_diag_init);
1161 module_exit(inet_diag_exit);
1162 MODULE_LICENSE("GPL");
1163 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 2 /* AF_INET */);
1164 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 10 /* AF_INET6 */);
1165 

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