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TOMOYO Linux Cross Reference
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         u32 ifindex;
 48         u32 mark;
 49 };
 50 
 51 static DEFINE_MUTEX(inet_diag_table_mutex);
 52 
 53 static const struct inet_diag_handler *inet_diag_lock_handler(int proto)
 54 {
 55         if (!inet_diag_table[proto])
 56                 request_module("net-pf-%d-proto-%d-type-%d-%d", PF_NETLINK,
 57                                NETLINK_SOCK_DIAG, AF_INET, proto);
 58 
 59         mutex_lock(&inet_diag_table_mutex);
 60         if (!inet_diag_table[proto])
 61                 return ERR_PTR(-ENOENT);
 62 
 63         return inet_diag_table[proto];
 64 }
 65 
 66 static void inet_diag_unlock_handler(const struct inet_diag_handler *handler)
 67 {
 68         mutex_unlock(&inet_diag_table_mutex);
 69 }
 70 
 71 void inet_diag_msg_common_fill(struct inet_diag_msg *r, struct sock *sk)
 72 {
 73         r->idiag_family = sk->sk_family;
 74 
 75         r->id.idiag_sport = htons(sk->sk_num);
 76         r->id.idiag_dport = sk->sk_dport;
 77         r->id.idiag_if = sk->sk_bound_dev_if;
 78         sock_diag_save_cookie(sk, r->id.idiag_cookie);
 79 
 80 #if IS_ENABLED(CONFIG_IPV6)
 81         if (sk->sk_family == AF_INET6) {
 82                 *(struct in6_addr *)r->id.idiag_src = sk->sk_v6_rcv_saddr;
 83                 *(struct in6_addr *)r->id.idiag_dst = sk->sk_v6_daddr;
 84         } else
 85 #endif
 86         {
 87         memset(&r->id.idiag_src, 0, sizeof(r->id.idiag_src));
 88         memset(&r->id.idiag_dst, 0, sizeof(r->id.idiag_dst));
 89 
 90         r->id.idiag_src[0] = sk->sk_rcv_saddr;
 91         r->id.idiag_dst[0] = sk->sk_daddr;
 92         }
 93 }
 94 EXPORT_SYMBOL_GPL(inet_diag_msg_common_fill);
 95 
 96 static size_t inet_sk_attr_size(void)
 97 {
 98         return    nla_total_size(sizeof(struct tcp_info))
 99                 + nla_total_size(1) /* INET_DIAG_SHUTDOWN */
100                 + nla_total_size(1) /* INET_DIAG_TOS */
101                 + nla_total_size(1) /* INET_DIAG_TCLASS */
102                 + nla_total_size(4) /* INET_DIAG_MARK */
103                 + nla_total_size(sizeof(struct inet_diag_meminfo))
104                 + nla_total_size(sizeof(struct inet_diag_msg))
105                 + nla_total_size(SK_MEMINFO_VARS * sizeof(u32))
106                 + nla_total_size(TCP_CA_NAME_MAX)
107                 + nla_total_size(sizeof(struct tcpvegas_info))
108                 + 64;
109 }
110 
111 int inet_diag_msg_attrs_fill(struct sock *sk, struct sk_buff *skb,
112                              struct inet_diag_msg *r, int ext,
113                              struct user_namespace *user_ns,
114                              bool net_admin)
115 {
116         const struct inet_sock *inet = inet_sk(sk);
117 
118         if (nla_put_u8(skb, INET_DIAG_SHUTDOWN, sk->sk_shutdown))
119                 goto errout;
120 
121         /* IPv6 dual-stack sockets use inet->tos for IPv4 connections,
122          * hence this needs to be included regardless of socket family.
123          */
124         if (ext & (1 << (INET_DIAG_TOS - 1)))
125                 if (nla_put_u8(skb, INET_DIAG_TOS, inet->tos) < 0)
126                         goto errout;
127 
128 #if IS_ENABLED(CONFIG_IPV6)
129         if (r->idiag_family == AF_INET6) {
130                 if (ext & (1 << (INET_DIAG_TCLASS - 1)))
131                         if (nla_put_u8(skb, INET_DIAG_TCLASS,
132                                        inet6_sk(sk)->tclass) < 0)
133                                 goto errout;
134 
135                 if (((1 << sk->sk_state) & (TCPF_LISTEN | TCPF_CLOSE)) &&
136                     nla_put_u8(skb, INET_DIAG_SKV6ONLY, ipv6_only_sock(sk)))
137                         goto errout;
138         }
139 #endif
140 
141         if (net_admin && nla_put_u32(skb, INET_DIAG_MARK, sk->sk_mark))
142                 goto errout;
143 
144         r->idiag_uid = from_kuid_munged(user_ns, sock_i_uid(sk));
145         r->idiag_inode = sock_i_ino(sk);
146 
147         return 0;
148 errout:
149         return 1;
150 }
151 EXPORT_SYMBOL_GPL(inet_diag_msg_attrs_fill);
152 
153 int inet_sk_diag_fill(struct sock *sk, struct inet_connection_sock *icsk,
154                       struct sk_buff *skb, const struct inet_diag_req_v2 *req,
155                       struct user_namespace *user_ns,
156                       u32 portid, u32 seq, u16 nlmsg_flags,
157                       const struct nlmsghdr *unlh,
158                       bool net_admin)
159 {
160         const struct tcp_congestion_ops *ca_ops;
161         const struct inet_diag_handler *handler;
162         int ext = req->idiag_ext;
163         struct inet_diag_msg *r;
164         struct nlmsghdr  *nlh;
165         struct nlattr *attr;
166         void *info = NULL;
167 
168         handler = inet_diag_table[req->sdiag_protocol];
169         BUG_ON(!handler);
170 
171         nlh = nlmsg_put(skb, portid, seq, unlh->nlmsg_type, sizeof(*r),
172                         nlmsg_flags);
173         if (!nlh)
174                 return -EMSGSIZE;
175 
176         r = nlmsg_data(nlh);
177         BUG_ON(!sk_fullsock(sk));
178 
179         inet_diag_msg_common_fill(r, sk);
180         r->idiag_state = sk->sk_state;
181         r->idiag_timer = 0;
182         r->idiag_retrans = 0;
183 
184         if (inet_diag_msg_attrs_fill(sk, skb, r, ext, user_ns, net_admin))
185                 goto errout;
186 
187         if (ext & (1 << (INET_DIAG_MEMINFO - 1))) {
188                 struct inet_diag_meminfo minfo = {
189                         .idiag_rmem = sk_rmem_alloc_get(sk),
190                         .idiag_wmem = sk->sk_wmem_queued,
191                         .idiag_fmem = sk->sk_forward_alloc,
192                         .idiag_tmem = sk_wmem_alloc_get(sk),
193                 };
194 
195                 if (nla_put(skb, INET_DIAG_MEMINFO, sizeof(minfo), &minfo) < 0)
196                         goto errout;
197         }
198 
199         if (ext & (1 << (INET_DIAG_SKMEMINFO - 1)))
200                 if (sock_diag_put_meminfo(sk, skb, INET_DIAG_SKMEMINFO))
201                         goto errout;
202 
203         /*
204          * RAW sockets might have user-defined protocols assigned,
205          * so report the one supplied on socket creation.
206          */
207         if (sk->sk_type == SOCK_RAW) {
208                 if (nla_put_u8(skb, INET_DIAG_PROTOCOL, sk->sk_protocol))
209                         goto errout;
210         }
211 
212         if (!icsk) {
213                 handler->idiag_get_info(sk, r, NULL);
214                 goto out;
215         }
216 
217         if (icsk->icsk_pending == ICSK_TIME_RETRANS ||
218             icsk->icsk_pending == ICSK_TIME_REO_TIMEOUT ||
219             icsk->icsk_pending == ICSK_TIME_LOSS_PROBE) {
220                 r->idiag_timer = 1;
221                 r->idiag_retrans = icsk->icsk_retransmits;
222                 r->idiag_expires =
223                         jiffies_to_msecs(icsk->icsk_timeout - jiffies);
224         } else if (icsk->icsk_pending == ICSK_TIME_PROBE0) {
225                 r->idiag_timer = 4;
226                 r->idiag_retrans = icsk->icsk_probes_out;
227                 r->idiag_expires =
228                         jiffies_to_msecs(icsk->icsk_timeout - jiffies);
229         } else if (timer_pending(&sk->sk_timer)) {
230                 r->idiag_timer = 2;
231                 r->idiag_retrans = icsk->icsk_probes_out;
232                 r->idiag_expires =
233                         jiffies_to_msecs(sk->sk_timer.expires - jiffies);
234         } else {
235                 r->idiag_timer = 0;
236                 r->idiag_expires = 0;
237         }
238 
239         if ((ext & (1 << (INET_DIAG_INFO - 1))) && handler->idiag_info_size) {
240                 attr = nla_reserve_64bit(skb, INET_DIAG_INFO,
241                                          handler->idiag_info_size,
242                                          INET_DIAG_PAD);
243                 if (!attr)
244                         goto errout;
245 
246                 info = nla_data(attr);
247         }
248 
249         if (ext & (1 << (INET_DIAG_CONG - 1))) {
250                 int err = 0;
251 
252                 rcu_read_lock();
253                 ca_ops = READ_ONCE(icsk->icsk_ca_ops);
254                 if (ca_ops)
255                         err = nla_put_string(skb, INET_DIAG_CONG, ca_ops->name);
256                 rcu_read_unlock();
257                 if (err < 0)
258                         goto errout;
259         }
260 
261         handler->idiag_get_info(sk, r, info);
262 
263         if (sk->sk_state < TCP_TIME_WAIT) {
264                 union tcp_cc_info info;
265                 size_t sz = 0;
266                 int attr;
267 
268                 rcu_read_lock();
269                 ca_ops = READ_ONCE(icsk->icsk_ca_ops);
270                 if (ca_ops && ca_ops->get_info)
271                         sz = ca_ops->get_info(sk, ext, &attr, &info);
272                 rcu_read_unlock();
273                 if (sz && nla_put(skb, attr, sz, &info) < 0)
274                         goto errout;
275         }
276 
277 out:
278         nlmsg_end(skb, nlh);
279         return 0;
280 
281 errout:
282         nlmsg_cancel(skb, nlh);
283         return -EMSGSIZE;
284 }
285 EXPORT_SYMBOL_GPL(inet_sk_diag_fill);
286 
287 static int inet_csk_diag_fill(struct sock *sk,
288                               struct sk_buff *skb,
289                               const struct inet_diag_req_v2 *req,
290                               struct user_namespace *user_ns,
291                               u32 portid, u32 seq, u16 nlmsg_flags,
292                               const struct nlmsghdr *unlh,
293                               bool net_admin)
294 {
295         return inet_sk_diag_fill(sk, inet_csk(sk), skb, req, user_ns,
296                                  portid, seq, nlmsg_flags, unlh, net_admin);
297 }
298 
299 static int inet_twsk_diag_fill(struct sock *sk,
300                                struct sk_buff *skb,
301                                u32 portid, u32 seq, u16 nlmsg_flags,
302                                const struct nlmsghdr *unlh)
303 {
304         struct inet_timewait_sock *tw = inet_twsk(sk);
305         struct inet_diag_msg *r;
306         struct nlmsghdr *nlh;
307         long tmo;
308 
309         nlh = nlmsg_put(skb, portid, seq, unlh->nlmsg_type, sizeof(*r),
310                         nlmsg_flags);
311         if (!nlh)
312                 return -EMSGSIZE;
313 
314         r = nlmsg_data(nlh);
315         BUG_ON(tw->tw_state != TCP_TIME_WAIT);
316 
317         tmo = tw->tw_timer.expires - jiffies;
318         if (tmo < 0)
319                 tmo = 0;
320 
321         inet_diag_msg_common_fill(r, sk);
322         r->idiag_retrans      = 0;
323 
324         r->idiag_state        = tw->tw_substate;
325         r->idiag_timer        = 3;
326         r->idiag_expires      = jiffies_to_msecs(tmo);
327         r->idiag_rqueue       = 0;
328         r->idiag_wqueue       = 0;
329         r->idiag_uid          = 0;
330         r->idiag_inode        = 0;
331 
332         nlmsg_end(skb, nlh);
333         return 0;
334 }
335 
336 static int inet_req_diag_fill(struct sock *sk, struct sk_buff *skb,
337                               u32 portid, u32 seq, u16 nlmsg_flags,
338                               const struct nlmsghdr *unlh, bool net_admin)
339 {
340         struct request_sock *reqsk = inet_reqsk(sk);
341         struct inet_diag_msg *r;
342         struct nlmsghdr *nlh;
343         long tmo;
344 
345         nlh = nlmsg_put(skb, portid, seq, unlh->nlmsg_type, sizeof(*r),
346                         nlmsg_flags);
347         if (!nlh)
348                 return -EMSGSIZE;
349 
350         r = nlmsg_data(nlh);
351         inet_diag_msg_common_fill(r, sk);
352         r->idiag_state = TCP_SYN_RECV;
353         r->idiag_timer = 1;
354         r->idiag_retrans = reqsk->num_retrans;
355 
356         BUILD_BUG_ON(offsetof(struct inet_request_sock, ir_cookie) !=
357                      offsetof(struct sock, sk_cookie));
358 
359         tmo = inet_reqsk(sk)->rsk_timer.expires - jiffies;
360         r->idiag_expires = (tmo >= 0) ? jiffies_to_msecs(tmo) : 0;
361         r->idiag_rqueue = 0;
362         r->idiag_wqueue = 0;
363         r->idiag_uid    = 0;
364         r->idiag_inode  = 0;
365 
366         if (net_admin && nla_put_u32(skb, INET_DIAG_MARK,
367                                      inet_rsk(reqsk)->ir_mark))
368                 return -EMSGSIZE;
369 
370         nlmsg_end(skb, nlh);
371         return 0;
372 }
373 
374 static int sk_diag_fill(struct sock *sk, struct sk_buff *skb,
375                         const struct inet_diag_req_v2 *r,
376                         struct user_namespace *user_ns,
377                         u32 portid, u32 seq, u16 nlmsg_flags,
378                         const struct nlmsghdr *unlh, bool net_admin)
379 {
380         if (sk->sk_state == TCP_TIME_WAIT)
381                 return inet_twsk_diag_fill(sk, skb, portid, seq,
382                                            nlmsg_flags, unlh);
383 
384         if (sk->sk_state == TCP_NEW_SYN_RECV)
385                 return inet_req_diag_fill(sk, skb, portid, seq,
386                                           nlmsg_flags, unlh, net_admin);
387 
388         return inet_csk_diag_fill(sk, skb, r, user_ns, portid, seq,
389                                   nlmsg_flags, unlh, net_admin);
390 }
391 
392 struct sock *inet_diag_find_one_icsk(struct net *net,
393                                      struct inet_hashinfo *hashinfo,
394                                      const struct inet_diag_req_v2 *req)
395 {
396         struct sock *sk;
397 
398         rcu_read_lock();
399         if (req->sdiag_family == AF_INET)
400                 sk = inet_lookup(net, hashinfo, NULL, 0, req->id.idiag_dst[0],
401                                  req->id.idiag_dport, req->id.idiag_src[0],
402                                  req->id.idiag_sport, req->id.idiag_if);
403 #if IS_ENABLED(CONFIG_IPV6)
404         else if (req->sdiag_family == AF_INET6) {
405                 if (ipv6_addr_v4mapped((struct in6_addr *)req->id.idiag_dst) &&
406                     ipv6_addr_v4mapped((struct in6_addr *)req->id.idiag_src))
407                         sk = inet_lookup(net, hashinfo, NULL, 0, req->id.idiag_dst[3],
408                                          req->id.idiag_dport, req->id.idiag_src[3],
409                                          req->id.idiag_sport, req->id.idiag_if);
410                 else
411                         sk = inet6_lookup(net, hashinfo, NULL, 0,
412                                           (struct in6_addr *)req->id.idiag_dst,
413                                           req->id.idiag_dport,
414                                           (struct in6_addr *)req->id.idiag_src,
415                                           req->id.idiag_sport,
416                                           req->id.idiag_if);
417         }
418 #endif
419         else {
420                 rcu_read_unlock();
421                 return ERR_PTR(-EINVAL);
422         }
423         rcu_read_unlock();
424         if (!sk)
425                 return ERR_PTR(-ENOENT);
426 
427         if (sock_diag_check_cookie(sk, req->id.idiag_cookie)) {
428                 sock_gen_put(sk);
429                 return ERR_PTR(-ENOENT);
430         }
431 
432         return sk;
433 }
434 EXPORT_SYMBOL_GPL(inet_diag_find_one_icsk);
435 
436 int inet_diag_dump_one_icsk(struct inet_hashinfo *hashinfo,
437                             struct sk_buff *in_skb,
438                             const struct nlmsghdr *nlh,
439                             const struct inet_diag_req_v2 *req)
440 {
441         struct net *net = sock_net(in_skb->sk);
442         struct sk_buff *rep;
443         struct sock *sk;
444         int err;
445 
446         sk = inet_diag_find_one_icsk(net, hashinfo, req);
447         if (IS_ERR(sk))
448                 return PTR_ERR(sk);
449 
450         rep = nlmsg_new(inet_sk_attr_size(), GFP_KERNEL);
451         if (!rep) {
452                 err = -ENOMEM;
453                 goto out;
454         }
455 
456         err = sk_diag_fill(sk, rep, req,
457                            sk_user_ns(NETLINK_CB(in_skb).sk),
458                            NETLINK_CB(in_skb).portid,
459                            nlh->nlmsg_seq, 0, nlh,
460                            netlink_net_capable(in_skb, CAP_NET_ADMIN));
461         if (err < 0) {
462                 WARN_ON(err == -EMSGSIZE);
463                 nlmsg_free(rep);
464                 goto out;
465         }
466         err = netlink_unicast(net->diag_nlsk, rep, NETLINK_CB(in_skb).portid,
467                               MSG_DONTWAIT);
468         if (err > 0)
469                 err = 0;
470 
471 out:
472         if (sk)
473                 sock_gen_put(sk);
474 
475         return err;
476 }
477 EXPORT_SYMBOL_GPL(inet_diag_dump_one_icsk);
478 
479 static int inet_diag_cmd_exact(int cmd, struct sk_buff *in_skb,
480                                const struct nlmsghdr *nlh,
481                                const struct inet_diag_req_v2 *req)
482 {
483         const struct inet_diag_handler *handler;
484         int err;
485 
486         handler = inet_diag_lock_handler(req->sdiag_protocol);
487         if (IS_ERR(handler))
488                 err = PTR_ERR(handler);
489         else if (cmd == SOCK_DIAG_BY_FAMILY)
490                 err = handler->dump_one(in_skb, nlh, req);
491         else if (cmd == SOCK_DESTROY && handler->destroy)
492                 err = handler->destroy(in_skb, req);
493         else
494                 err = -EOPNOTSUPP;
495         inet_diag_unlock_handler(handler);
496 
497         return err;
498 }
499 
500 static int bitstring_match(const __be32 *a1, const __be32 *a2, int bits)
501 {
502         int words = bits >> 5;
503 
504         bits &= 0x1f;
505 
506         if (words) {
507                 if (memcmp(a1, a2, words << 2))
508                         return 0;
509         }
510         if (bits) {
511                 __be32 w1, w2;
512                 __be32 mask;
513 
514                 w1 = a1[words];
515                 w2 = a2[words];
516 
517                 mask = htonl((0xffffffff) << (32 - bits));
518 
519                 if ((w1 ^ w2) & mask)
520                         return 0;
521         }
522 
523         return 1;
524 }
525 
526 static int inet_diag_bc_run(const struct nlattr *_bc,
527                             const struct inet_diag_entry *entry)
528 {
529         const void *bc = nla_data(_bc);
530         int len = nla_len(_bc);
531 
532         while (len > 0) {
533                 int yes = 1;
534                 const struct inet_diag_bc_op *op = bc;
535 
536                 switch (op->code) {
537                 case INET_DIAG_BC_NOP:
538                         break;
539                 case INET_DIAG_BC_JMP:
540                         yes = 0;
541                         break;
542                 case INET_DIAG_BC_S_GE:
543                         yes = entry->sport >= op[1].no;
544                         break;
545                 case INET_DIAG_BC_S_LE:
546                         yes = entry->sport <= op[1].no;
547                         break;
548                 case INET_DIAG_BC_D_GE:
549                         yes = entry->dport >= op[1].no;
550                         break;
551                 case INET_DIAG_BC_D_LE:
552                         yes = entry->dport <= op[1].no;
553                         break;
554                 case INET_DIAG_BC_AUTO:
555                         yes = !(entry->userlocks & SOCK_BINDPORT_LOCK);
556                         break;
557                 case INET_DIAG_BC_S_COND:
558                 case INET_DIAG_BC_D_COND: {
559                         const struct inet_diag_hostcond *cond;
560                         const __be32 *addr;
561 
562                         cond = (const struct inet_diag_hostcond *)(op + 1);
563                         if (cond->port != -1 &&
564                             cond->port != (op->code == INET_DIAG_BC_S_COND ?
565                                              entry->sport : entry->dport)) {
566                                 yes = 0;
567                                 break;
568                         }
569 
570                         if (op->code == INET_DIAG_BC_S_COND)
571                                 addr = entry->saddr;
572                         else
573                                 addr = entry->daddr;
574 
575                         if (cond->family != AF_UNSPEC &&
576                             cond->family != entry->family) {
577                                 if (entry->family == AF_INET6 &&
578                                     cond->family == AF_INET) {
579                                         if (addr[0] == 0 && addr[1] == 0 &&
580                                             addr[2] == htonl(0xffff) &&
581                                             bitstring_match(addr + 3,
582                                                             cond->addr,
583                                                             cond->prefix_len))
584                                                 break;
585                                 }
586                                 yes = 0;
587                                 break;
588                         }
589 
590                         if (cond->prefix_len == 0)
591                                 break;
592                         if (bitstring_match(addr, cond->addr,
593                                             cond->prefix_len))
594                                 break;
595                         yes = 0;
596                         break;
597                 }
598                 case INET_DIAG_BC_DEV_COND: {
599                         u32 ifindex;
600 
601                         ifindex = *((const u32 *)(op + 1));
602                         if (ifindex != entry->ifindex)
603                                 yes = 0;
604                         break;
605                 }
606                 case INET_DIAG_BC_MARK_COND: {
607                         struct inet_diag_markcond *cond;
608 
609                         cond = (struct inet_diag_markcond *)(op + 1);
610                         if ((entry->mark & cond->mask) != cond->mark)
611                                 yes = 0;
612                         break;
613                 }
614                 }
615 
616                 if (yes) {
617                         len -= op->yes;
618                         bc += op->yes;
619                 } else {
620                         len -= op->no;
621                         bc += op->no;
622                 }
623         }
624         return len == 0;
625 }
626 
627 /* This helper is available for all sockets (ESTABLISH, TIMEWAIT, SYN_RECV)
628  */
629 static void entry_fill_addrs(struct inet_diag_entry *entry,
630                              const struct sock *sk)
631 {
632 #if IS_ENABLED(CONFIG_IPV6)
633         if (sk->sk_family == AF_INET6) {
634                 entry->saddr = sk->sk_v6_rcv_saddr.s6_addr32;
635                 entry->daddr = sk->sk_v6_daddr.s6_addr32;
636         } else
637 #endif
638         {
639                 entry->saddr = &sk->sk_rcv_saddr;
640                 entry->daddr = &sk->sk_daddr;
641         }
642 }
643 
644 int inet_diag_bc_sk(const struct nlattr *bc, struct sock *sk)
645 {
646         struct inet_sock *inet = inet_sk(sk);
647         struct inet_diag_entry entry;
648 
649         if (!bc)
650                 return 1;
651 
652         entry.family = sk->sk_family;
653         entry_fill_addrs(&entry, sk);
654         entry.sport = inet->inet_num;
655         entry.dport = ntohs(inet->inet_dport);
656         entry.ifindex = sk->sk_bound_dev_if;
657         entry.userlocks = sk_fullsock(sk) ? sk->sk_userlocks : 0;
658         if (sk_fullsock(sk))
659                 entry.mark = sk->sk_mark;
660         else if (sk->sk_state == TCP_NEW_SYN_RECV)
661                 entry.mark = inet_rsk(inet_reqsk(sk))->ir_mark;
662         else
663                 entry.mark = 0;
664 
665         return inet_diag_bc_run(bc, &entry);
666 }
667 EXPORT_SYMBOL_GPL(inet_diag_bc_sk);
668 
669 static int valid_cc(const void *bc, int len, int cc)
670 {
671         while (len >= 0) {
672                 const struct inet_diag_bc_op *op = bc;
673 
674                 if (cc > len)
675                         return 0;
676                 if (cc == len)
677                         return 1;
678                 if (op->yes < 4 || op->yes & 3)
679                         return 0;
680                 len -= op->yes;
681                 bc  += op->yes;
682         }
683         return 0;
684 }
685 
686 /* data is u32 ifindex */
687 static bool valid_devcond(const struct inet_diag_bc_op *op, int len,
688                           int *min_len)
689 {
690         /* Check ifindex space. */
691         *min_len += sizeof(u32);
692         if (len < *min_len)
693                 return false;
694 
695         return true;
696 }
697 /* Validate an inet_diag_hostcond. */
698 static bool valid_hostcond(const struct inet_diag_bc_op *op, int len,
699                            int *min_len)
700 {
701         struct inet_diag_hostcond *cond;
702         int addr_len;
703 
704         /* Check hostcond space. */
705         *min_len += sizeof(struct inet_diag_hostcond);
706         if (len < *min_len)
707                 return false;
708         cond = (struct inet_diag_hostcond *)(op + 1);
709 
710         /* Check address family and address length. */
711         switch (cond->family) {
712         case AF_UNSPEC:
713                 addr_len = 0;
714                 break;
715         case AF_INET:
716                 addr_len = sizeof(struct in_addr);
717                 break;
718         case AF_INET6:
719                 addr_len = sizeof(struct in6_addr);
720                 break;
721         default:
722                 return false;
723         }
724         *min_len += addr_len;
725         if (len < *min_len)
726                 return false;
727 
728         /* Check prefix length (in bits) vs address length (in bytes). */
729         if (cond->prefix_len > 8 * addr_len)
730                 return false;
731 
732         return true;
733 }
734 
735 /* Validate a port comparison operator. */
736 static bool valid_port_comparison(const struct inet_diag_bc_op *op,
737                                   int len, int *min_len)
738 {
739         /* Port comparisons put the port in a follow-on inet_diag_bc_op. */
740         *min_len += sizeof(struct inet_diag_bc_op);
741         if (len < *min_len)
742                 return false;
743         return true;
744 }
745 
746 static bool valid_markcond(const struct inet_diag_bc_op *op, int len,
747                            int *min_len)
748 {
749         *min_len += sizeof(struct inet_diag_markcond);
750         return len >= *min_len;
751 }
752 
753 static int inet_diag_bc_audit(const struct nlattr *attr,
754                               const struct sk_buff *skb)
755 {
756         bool net_admin = netlink_net_capable(skb, CAP_NET_ADMIN);
757         const void *bytecode, *bc;
758         int bytecode_len, len;
759 
760         if (!attr || nla_len(attr) < sizeof(struct inet_diag_bc_op))
761                 return -EINVAL;
762 
763         bytecode = bc = nla_data(attr);
764         len = bytecode_len = nla_len(attr);
765 
766         while (len > 0) {
767                 int min_len = sizeof(struct inet_diag_bc_op);
768                 const struct inet_diag_bc_op *op = bc;
769 
770                 switch (op->code) {
771                 case INET_DIAG_BC_S_COND:
772                 case INET_DIAG_BC_D_COND:
773                         if (!valid_hostcond(bc, len, &min_len))
774                                 return -EINVAL;
775                         break;
776                 case INET_DIAG_BC_DEV_COND:
777                         if (!valid_devcond(bc, len, &min_len))
778                                 return -EINVAL;
779                         break;
780                 case INET_DIAG_BC_S_GE:
781                 case INET_DIAG_BC_S_LE:
782                 case INET_DIAG_BC_D_GE:
783                 case INET_DIAG_BC_D_LE:
784                         if (!valid_port_comparison(bc, len, &min_len))
785                                 return -EINVAL;
786                         break;
787                 case INET_DIAG_BC_MARK_COND:
788                         if (!net_admin)
789                                 return -EPERM;
790                         if (!valid_markcond(bc, len, &min_len))
791                                 return -EINVAL;
792                         break;
793                 case INET_DIAG_BC_AUTO:
794                 case INET_DIAG_BC_JMP:
795                 case INET_DIAG_BC_NOP:
796                         break;
797                 default:
798                         return -EINVAL;
799                 }
800 
801                 if (op->code != INET_DIAG_BC_NOP) {
802                         if (op->no < min_len || op->no > len + 4 || op->no & 3)
803                                 return -EINVAL;
804                         if (op->no < len &&
805                             !valid_cc(bytecode, bytecode_len, len - op->no))
806                                 return -EINVAL;
807                 }
808 
809                 if (op->yes < min_len || op->yes > len + 4 || op->yes & 3)
810                         return -EINVAL;
811                 bc  += op->yes;
812                 len -= op->yes;
813         }
814         return len == 0 ? 0 : -EINVAL;
815 }
816 
817 static int inet_csk_diag_dump(struct sock *sk,
818                               struct sk_buff *skb,
819                               struct netlink_callback *cb,
820                               const struct inet_diag_req_v2 *r,
821                               const struct nlattr *bc,
822                               bool net_admin)
823 {
824         if (!inet_diag_bc_sk(bc, sk))
825                 return 0;
826 
827         return inet_csk_diag_fill(sk, skb, r,
828                                   sk_user_ns(NETLINK_CB(cb->skb).sk),
829                                   NETLINK_CB(cb->skb).portid,
830                                   cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh,
831                                   net_admin);
832 }
833 
834 static void twsk_build_assert(void)
835 {
836         BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_family) !=
837                      offsetof(struct sock, sk_family));
838 
839         BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_num) !=
840                      offsetof(struct inet_sock, inet_num));
841 
842         BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_dport) !=
843                      offsetof(struct inet_sock, inet_dport));
844 
845         BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_rcv_saddr) !=
846                      offsetof(struct inet_sock, inet_rcv_saddr));
847 
848         BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_daddr) !=
849                      offsetof(struct inet_sock, inet_daddr));
850 
851 #if IS_ENABLED(CONFIG_IPV6)
852         BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_v6_rcv_saddr) !=
853                      offsetof(struct sock, sk_v6_rcv_saddr));
854 
855         BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_v6_daddr) !=
856                      offsetof(struct sock, sk_v6_daddr));
857 #endif
858 }
859 
860 void inet_diag_dump_icsk(struct inet_hashinfo *hashinfo, struct sk_buff *skb,
861                          struct netlink_callback *cb,
862                          const struct inet_diag_req_v2 *r, struct nlattr *bc)
863 {
864         bool net_admin = netlink_net_capable(cb->skb, CAP_NET_ADMIN);
865         struct net *net = sock_net(skb->sk);
866         u32 idiag_states = r->idiag_states;
867         int i, num, s_i, s_num;
868         struct sock *sk;
869 
870         if (idiag_states & TCPF_SYN_RECV)
871                 idiag_states |= TCPF_NEW_SYN_RECV;
872         s_i = cb->args[1];
873         s_num = num = cb->args[2];
874 
875         if (cb->args[0] == 0) {
876                 if (!(idiag_states & TCPF_LISTEN) || r->id.idiag_dport)
877                         goto skip_listen_ht;
878 
879                 for (i = s_i; i < INET_LHTABLE_SIZE; i++) {
880                         struct inet_listen_hashbucket *ilb;
881 
882                         num = 0;
883                         ilb = &hashinfo->listening_hash[i];
884                         spin_lock(&ilb->lock);
885                         sk_for_each(sk, &ilb->head) {
886                                 struct inet_sock *inet = inet_sk(sk);
887 
888                                 if (!net_eq(sock_net(sk), net))
889                                         continue;
890 
891                                 if (num < s_num) {
892                                         num++;
893                                         continue;
894                                 }
895 
896                                 if (r->sdiag_family != AF_UNSPEC &&
897                                     sk->sk_family != r->sdiag_family)
898                                         goto next_listen;
899 
900                                 if (r->id.idiag_sport != inet->inet_sport &&
901                                     r->id.idiag_sport)
902                                         goto next_listen;
903 
904                                 if (inet_csk_diag_dump(sk, skb, cb, r,
905                                                        bc, net_admin) < 0) {
906                                         spin_unlock(&ilb->lock);
907                                         goto done;
908                                 }
909 
910 next_listen:
911                                 ++num;
912                         }
913                         spin_unlock(&ilb->lock);
914 
915                         s_num = 0;
916                 }
917 skip_listen_ht:
918                 cb->args[0] = 1;
919                 s_i = num = s_num = 0;
920         }
921 
922         if (!(idiag_states & ~TCPF_LISTEN))
923                 goto out;
924 
925 #define SKARR_SZ 16
926         for (i = s_i; i <= hashinfo->ehash_mask; i++) {
927                 struct inet_ehash_bucket *head = &hashinfo->ehash[i];
928                 spinlock_t *lock = inet_ehash_lockp(hashinfo, i);
929                 struct hlist_nulls_node *node;
930                 struct sock *sk_arr[SKARR_SZ];
931                 int num_arr[SKARR_SZ];
932                 int idx, accum, res;
933 
934                 if (hlist_nulls_empty(&head->chain))
935                         continue;
936 
937                 if (i > s_i)
938                         s_num = 0;
939 
940 next_chunk:
941                 num = 0;
942                 accum = 0;
943                 spin_lock_bh(lock);
944                 sk_nulls_for_each(sk, node, &head->chain) {
945                         int state;
946 
947                         if (!net_eq(sock_net(sk), net))
948                                 continue;
949                         if (num < s_num)
950                                 goto next_normal;
951                         state = (sk->sk_state == TCP_TIME_WAIT) ?
952                                 inet_twsk(sk)->tw_substate : sk->sk_state;
953                         if (!(idiag_states & (1 << state)))
954                                 goto next_normal;
955                         if (r->sdiag_family != AF_UNSPEC &&
956                             sk->sk_family != r->sdiag_family)
957                                 goto next_normal;
958                         if (r->id.idiag_sport != htons(sk->sk_num) &&
959                             r->id.idiag_sport)
960                                 goto next_normal;
961                         if (r->id.idiag_dport != sk->sk_dport &&
962                             r->id.idiag_dport)
963                                 goto next_normal;
964                         twsk_build_assert();
965 
966                         if (!inet_diag_bc_sk(bc, sk))
967                                 goto next_normal;
968 
969                         sock_hold(sk);
970                         num_arr[accum] = num;
971                         sk_arr[accum] = sk;
972                         if (++accum == SKARR_SZ)
973                                 break;
974 next_normal:
975                         ++num;
976                 }
977                 spin_unlock_bh(lock);
978                 res = 0;
979                 for (idx = 0; idx < accum; idx++) {
980                         if (res >= 0) {
981                                 res = sk_diag_fill(sk_arr[idx], skb, r,
982                                            sk_user_ns(NETLINK_CB(cb->skb).sk),
983                                            NETLINK_CB(cb->skb).portid,
984                                            cb->nlh->nlmsg_seq, NLM_F_MULTI,
985                                            cb->nlh, net_admin);
986                                 if (res < 0)
987                                         num = num_arr[idx];
988                         }
989                         sock_gen_put(sk_arr[idx]);
990                 }
991                 if (res < 0)
992                         break;
993                 cond_resched();
994                 if (accum == SKARR_SZ) {
995                         s_num = num + 1;
996                         goto next_chunk;
997                 }
998         }
999 
1000 done:
1001         cb->args[1] = i;
1002         cb->args[2] = num;
1003 out:
1004         ;
1005 }
1006 EXPORT_SYMBOL_GPL(inet_diag_dump_icsk);
1007 
1008 static int __inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb,
1009                             const struct inet_diag_req_v2 *r,
1010                             struct nlattr *bc)
1011 {
1012         const struct inet_diag_handler *handler;
1013         int err = 0;
1014 
1015         handler = inet_diag_lock_handler(r->sdiag_protocol);
1016         if (!IS_ERR(handler))
1017                 handler->dump(skb, cb, r, bc);
1018         else
1019                 err = PTR_ERR(handler);
1020         inet_diag_unlock_handler(handler);
1021 
1022         return err ? : skb->len;
1023 }
1024 
1025 static int inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb)
1026 {
1027         int hdrlen = sizeof(struct inet_diag_req_v2);
1028         struct nlattr *bc = NULL;
1029 
1030         if (nlmsg_attrlen(cb->nlh, hdrlen))
1031                 bc = nlmsg_find_attr(cb->nlh, hdrlen, INET_DIAG_REQ_BYTECODE);
1032 
1033         return __inet_diag_dump(skb, cb, nlmsg_data(cb->nlh), bc);
1034 }
1035 
1036 static int inet_diag_type2proto(int type)
1037 {
1038         switch (type) {
1039         case TCPDIAG_GETSOCK:
1040                 return IPPROTO_TCP;
1041         case DCCPDIAG_GETSOCK:
1042                 return IPPROTO_DCCP;
1043         default:
1044                 return 0;
1045         }
1046 }
1047 
1048 static int inet_diag_dump_compat(struct sk_buff *skb,
1049                                  struct netlink_callback *cb)
1050 {
1051         struct inet_diag_req *rc = nlmsg_data(cb->nlh);
1052         int hdrlen = sizeof(struct inet_diag_req);
1053         struct inet_diag_req_v2 req;
1054         struct nlattr *bc = NULL;
1055 
1056         req.sdiag_family = AF_UNSPEC; /* compatibility */
1057         req.sdiag_protocol = inet_diag_type2proto(cb->nlh->nlmsg_type);
1058         req.idiag_ext = rc->idiag_ext;
1059         req.idiag_states = rc->idiag_states;
1060         req.id = rc->id;
1061 
1062         if (nlmsg_attrlen(cb->nlh, hdrlen))
1063                 bc = nlmsg_find_attr(cb->nlh, hdrlen, INET_DIAG_REQ_BYTECODE);
1064 
1065         return __inet_diag_dump(skb, cb, &req, bc);
1066 }
1067 
1068 static int inet_diag_get_exact_compat(struct sk_buff *in_skb,
1069                                       const struct nlmsghdr *nlh)
1070 {
1071         struct inet_diag_req *rc = nlmsg_data(nlh);
1072         struct inet_diag_req_v2 req;
1073 
1074         req.sdiag_family = rc->idiag_family;
1075         req.sdiag_protocol = inet_diag_type2proto(nlh->nlmsg_type);
1076         req.idiag_ext = rc->idiag_ext;
1077         req.idiag_states = rc->idiag_states;
1078         req.id = rc->id;
1079 
1080         return inet_diag_cmd_exact(SOCK_DIAG_BY_FAMILY, in_skb, nlh, &req);
1081 }
1082 
1083 static int inet_diag_rcv_msg_compat(struct sk_buff *skb, struct nlmsghdr *nlh)
1084 {
1085         int hdrlen = sizeof(struct inet_diag_req);
1086         struct net *net = sock_net(skb->sk);
1087 
1088         if (nlh->nlmsg_type >= INET_DIAG_GETSOCK_MAX ||
1089             nlmsg_len(nlh) < hdrlen)
1090                 return -EINVAL;
1091 
1092         if (nlh->nlmsg_flags & NLM_F_DUMP) {
1093                 if (nlmsg_attrlen(nlh, hdrlen)) {
1094                         struct nlattr *attr;
1095                         int err;
1096 
1097                         attr = nlmsg_find_attr(nlh, hdrlen,
1098                                                INET_DIAG_REQ_BYTECODE);
1099                         err = inet_diag_bc_audit(attr, skb);
1100                         if (err)
1101                                 return err;
1102                 }
1103                 {
1104                         struct netlink_dump_control c = {
1105                                 .dump = inet_diag_dump_compat,
1106                         };
1107                         return netlink_dump_start(net->diag_nlsk, skb, nlh, &c);
1108                 }
1109         }
1110 
1111         return inet_diag_get_exact_compat(skb, nlh);
1112 }
1113 
1114 static int inet_diag_handler_cmd(struct sk_buff *skb, struct nlmsghdr *h)
1115 {
1116         int hdrlen = sizeof(struct inet_diag_req_v2);
1117         struct net *net = sock_net(skb->sk);
1118 
1119         if (nlmsg_len(h) < hdrlen)
1120                 return -EINVAL;
1121 
1122         if (h->nlmsg_type == SOCK_DIAG_BY_FAMILY &&
1123             h->nlmsg_flags & NLM_F_DUMP) {
1124                 if (nlmsg_attrlen(h, hdrlen)) {
1125                         struct nlattr *attr;
1126                         int err;
1127 
1128                         attr = nlmsg_find_attr(h, hdrlen,
1129                                                INET_DIAG_REQ_BYTECODE);
1130                         err = inet_diag_bc_audit(attr, skb);
1131                         if (err)
1132                                 return err;
1133                 }
1134                 {
1135                         struct netlink_dump_control c = {
1136                                 .dump = inet_diag_dump,
1137                         };
1138                         return netlink_dump_start(net->diag_nlsk, skb, h, &c);
1139                 }
1140         }
1141 
1142         return inet_diag_cmd_exact(h->nlmsg_type, skb, h, nlmsg_data(h));
1143 }
1144 
1145 static
1146 int inet_diag_handler_get_info(struct sk_buff *skb, struct sock *sk)
1147 {
1148         const struct inet_diag_handler *handler;
1149         struct nlmsghdr *nlh;
1150         struct nlattr *attr;
1151         struct inet_diag_msg *r;
1152         void *info = NULL;
1153         int err = 0;
1154 
1155         nlh = nlmsg_put(skb, 0, 0, SOCK_DIAG_BY_FAMILY, sizeof(*r), 0);
1156         if (!nlh)
1157                 return -ENOMEM;
1158 
1159         r = nlmsg_data(nlh);
1160         memset(r, 0, sizeof(*r));
1161         inet_diag_msg_common_fill(r, sk);
1162         if (sk->sk_type == SOCK_DGRAM || sk->sk_type == SOCK_STREAM)
1163                 r->id.idiag_sport = inet_sk(sk)->inet_sport;
1164         r->idiag_state = sk->sk_state;
1165 
1166         if ((err = nla_put_u8(skb, INET_DIAG_PROTOCOL, sk->sk_protocol))) {
1167                 nlmsg_cancel(skb, nlh);
1168                 return err;
1169         }
1170 
1171         handler = inet_diag_lock_handler(sk->sk_protocol);
1172         if (IS_ERR(handler)) {
1173                 inet_diag_unlock_handler(handler);
1174                 nlmsg_cancel(skb, nlh);
1175                 return PTR_ERR(handler);
1176         }
1177 
1178         attr = handler->idiag_info_size
1179                 ? nla_reserve_64bit(skb, INET_DIAG_INFO,
1180                                     handler->idiag_info_size,
1181                                     INET_DIAG_PAD)
1182                 : NULL;
1183         if (attr)
1184                 info = nla_data(attr);
1185 
1186         handler->idiag_get_info(sk, r, info);
1187         inet_diag_unlock_handler(handler);
1188 
1189         nlmsg_end(skb, nlh);
1190         return 0;
1191 }
1192 
1193 static const struct sock_diag_handler inet_diag_handler = {
1194         .family = AF_INET,
1195         .dump = inet_diag_handler_cmd,
1196         .get_info = inet_diag_handler_get_info,
1197         .destroy = inet_diag_handler_cmd,
1198 };
1199 
1200 static const struct sock_diag_handler inet6_diag_handler = {
1201         .family = AF_INET6,
1202         .dump = inet_diag_handler_cmd,
1203         .get_info = inet_diag_handler_get_info,
1204         .destroy = inet_diag_handler_cmd,
1205 };
1206 
1207 int inet_diag_register(const struct inet_diag_handler *h)
1208 {
1209         const __u16 type = h->idiag_type;
1210         int err = -EINVAL;
1211 
1212         if (type >= IPPROTO_MAX)
1213                 goto out;
1214 
1215         mutex_lock(&inet_diag_table_mutex);
1216         err = -EEXIST;
1217         if (!inet_diag_table[type]) {
1218                 inet_diag_table[type] = h;
1219                 err = 0;
1220         }
1221         mutex_unlock(&inet_diag_table_mutex);
1222 out:
1223         return err;
1224 }
1225 EXPORT_SYMBOL_GPL(inet_diag_register);
1226 
1227 void inet_diag_unregister(const struct inet_diag_handler *h)
1228 {
1229         const __u16 type = h->idiag_type;
1230 
1231         if (type >= IPPROTO_MAX)
1232                 return;
1233 
1234         mutex_lock(&inet_diag_table_mutex);
1235         inet_diag_table[type] = NULL;
1236         mutex_unlock(&inet_diag_table_mutex);
1237 }
1238 EXPORT_SYMBOL_GPL(inet_diag_unregister);
1239 
1240 static int __init inet_diag_init(void)
1241 {
1242         const int inet_diag_table_size = (IPPROTO_MAX *
1243                                           sizeof(struct inet_diag_handler *));
1244         int err = -ENOMEM;
1245 
1246         inet_diag_table = kzalloc(inet_diag_table_size, GFP_KERNEL);
1247         if (!inet_diag_table)
1248                 goto out;
1249 
1250         err = sock_diag_register(&inet_diag_handler);
1251         if (err)
1252                 goto out_free_nl;
1253 
1254         err = sock_diag_register(&inet6_diag_handler);
1255         if (err)
1256                 goto out_free_inet;
1257 
1258         sock_diag_register_inet_compat(inet_diag_rcv_msg_compat);
1259 out:
1260         return err;
1261 
1262 out_free_inet:
1263         sock_diag_unregister(&inet_diag_handler);
1264 out_free_nl:
1265         kfree(inet_diag_table);
1266         goto out;
1267 }
1268 
1269 static void __exit inet_diag_exit(void)
1270 {
1271         sock_diag_unregister(&inet6_diag_handler);
1272         sock_diag_unregister(&inet_diag_handler);
1273         sock_diag_unregister_inet_compat(inet_diag_rcv_msg_compat);
1274         kfree(inet_diag_table);
1275 }
1276 
1277 module_init(inet_diag_init);
1278 module_exit(inet_diag_exit);
1279 MODULE_LICENSE("GPL");
1280 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 2 /* AF_INET */);
1281 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 10 /* AF_INET6 */);
1282 

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