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Linux/net/ipv4/af_inet.c

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  1 /*
  2  * INET         An implementation of the TCP/IP protocol suite for the LINUX
  3  *              operating system.  INET is implemented using the  BSD Socket
  4  *              interface as the means of communication with the user level.
  5  *
  6  *              PF_INET protocol family socket handler.
  7  *
  8  * Authors:     Ross Biro
  9  *              Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
 10  *              Florian La Roche, <flla@stud.uni-sb.de>
 11  *              Alan Cox, <A.Cox@swansea.ac.uk>
 12  *
 13  * Changes (see also sock.c)
 14  *
 15  *              piggy,
 16  *              Karl Knutson    :       Socket protocol table
 17  *              A.N.Kuznetsov   :       Socket death error in accept().
 18  *              John Richardson :       Fix non blocking error in connect()
 19  *                                      so sockets that fail to connect
 20  *                                      don't return -EINPROGRESS.
 21  *              Alan Cox        :       Asynchronous I/O support
 22  *              Alan Cox        :       Keep correct socket pointer on sock
 23  *                                      structures
 24  *                                      when accept() ed
 25  *              Alan Cox        :       Semantics of SO_LINGER aren't state
 26  *                                      moved to close when you look carefully.
 27  *                                      With this fixed and the accept bug fixed
 28  *                                      some RPC stuff seems happier.
 29  *              Niibe Yutaka    :       4.4BSD style write async I/O
 30  *              Alan Cox,
 31  *              Tony Gale       :       Fixed reuse semantics.
 32  *              Alan Cox        :       bind() shouldn't abort existing but dead
 33  *                                      sockets. Stops FTP netin:.. I hope.
 34  *              Alan Cox        :       bind() works correctly for RAW sockets.
 35  *                                      Note that FreeBSD at least was broken
 36  *                                      in this respect so be careful with
 37  *                                      compatibility tests...
 38  *              Alan Cox        :       routing cache support
 39  *              Alan Cox        :       memzero the socket structure for
 40  *                                      compactness.
 41  *              Matt Day        :       nonblock connect error handler
 42  *              Alan Cox        :       Allow large numbers of pending sockets
 43  *                                      (eg for big web sites), but only if
 44  *                                      specifically application requested.
 45  *              Alan Cox        :       New buffering throughout IP. Used
 46  *                                      dumbly.
 47  *              Alan Cox        :       New buffering now used smartly.
 48  *              Alan Cox        :       BSD rather than common sense
 49  *                                      interpretation of listen.
 50  *              Germano Caronni :       Assorted small races.
 51  *              Alan Cox        :       sendmsg/recvmsg basic support.
 52  *              Alan Cox        :       Only sendmsg/recvmsg now supported.
 53  *              Alan Cox        :       Locked down bind (see security list).
 54  *              Alan Cox        :       Loosened bind a little.
 55  *              Mike McLagan    :       ADD/DEL DLCI Ioctls
 56  *      Willy Konynenberg       :       Transparent proxying support.
 57  *              David S. Miller :       New socket lookup architecture.
 58  *                                      Some other random speedups.
 59  *              Cyrus Durgin    :       Cleaned up file for kmod hacks.
 60  *              Andi Kleen      :       Fix inet_stream_connect TCP race.
 61  *
 62  *              This program is free software; you can redistribute it and/or
 63  *              modify it under the terms of the GNU General Public License
 64  *              as published by the Free Software Foundation; either version
 65  *              2 of the License, or (at your option) any later version.
 66  */
 67 
 68 #define pr_fmt(fmt) "IPv4: " fmt
 69 
 70 #include <linux/err.h>
 71 #include <linux/errno.h>
 72 #include <linux/types.h>
 73 #include <linux/socket.h>
 74 #include <linux/in.h>
 75 #include <linux/kernel.h>
 76 #include <linux/kmod.h>
 77 #include <linux/sched.h>
 78 #include <linux/timer.h>
 79 #include <linux/string.h>
 80 #include <linux/sockios.h>
 81 #include <linux/net.h>
 82 #include <linux/capability.h>
 83 #include <linux/fcntl.h>
 84 #include <linux/mm.h>
 85 #include <linux/interrupt.h>
 86 #include <linux/stat.h>
 87 #include <linux/init.h>
 88 #include <linux/poll.h>
 89 #include <linux/netfilter_ipv4.h>
 90 #include <linux/random.h>
 91 #include <linux/slab.h>
 92 
 93 #include <linux/uaccess.h>
 94 
 95 #include <linux/inet.h>
 96 #include <linux/igmp.h>
 97 #include <linux/inetdevice.h>
 98 #include <linux/netdevice.h>
 99 #include <net/checksum.h>
100 #include <net/ip.h>
101 #include <net/protocol.h>
102 #include <net/arp.h>
103 #include <net/route.h>
104 #include <net/ip_fib.h>
105 #include <net/inet_connection_sock.h>
106 #include <net/tcp.h>
107 #include <net/udp.h>
108 #include <net/udplite.h>
109 #include <net/ping.h>
110 #include <linux/skbuff.h>
111 #include <net/sock.h>
112 #include <net/raw.h>
113 #include <net/icmp.h>
114 #include <net/inet_common.h>
115 #include <net/ip_tunnels.h>
116 #include <net/xfrm.h>
117 #include <net/net_namespace.h>
118 #include <net/secure_seq.h>
119 #ifdef CONFIG_IP_MROUTE
120 #include <linux/mroute.h>
121 #endif
122 #include <net/l3mdev.h>
123 
124 
125 /* The inetsw table contains everything that inet_create needs to
126  * build a new socket.
127  */
128 static struct list_head inetsw[SOCK_MAX];
129 static DEFINE_SPINLOCK(inetsw_lock);
130 
131 /* New destruction routine */
132 
133 void inet_sock_destruct(struct sock *sk)
134 {
135         struct inet_sock *inet = inet_sk(sk);
136 
137         __skb_queue_purge(&sk->sk_receive_queue);
138         __skb_queue_purge(&sk->sk_error_queue);
139 
140         sk_mem_reclaim(sk);
141 
142         if (sk->sk_type == SOCK_STREAM && sk->sk_state != TCP_CLOSE) {
143                 pr_err("Attempt to release TCP socket in state %d %p\n",
144                        sk->sk_state, sk);
145                 return;
146         }
147         if (!sock_flag(sk, SOCK_DEAD)) {
148                 pr_err("Attempt to release alive inet socket %p\n", sk);
149                 return;
150         }
151 
152         WARN_ON(atomic_read(&sk->sk_rmem_alloc));
153         WARN_ON(refcount_read(&sk->sk_wmem_alloc));
154         WARN_ON(sk->sk_wmem_queued);
155         WARN_ON(sk->sk_forward_alloc);
156 
157         kfree(rcu_dereference_protected(inet->inet_opt, 1));
158         dst_release(rcu_dereference_check(sk->sk_dst_cache, 1));
159         dst_release(sk->sk_rx_dst);
160         sk_refcnt_debug_dec(sk);
161 }
162 EXPORT_SYMBOL(inet_sock_destruct);
163 
164 /*
165  *      The routines beyond this point handle the behaviour of an AF_INET
166  *      socket object. Mostly it punts to the subprotocols of IP to do
167  *      the work.
168  */
169 
170 /*
171  *      Automatically bind an unbound socket.
172  */
173 
174 static int inet_autobind(struct sock *sk)
175 {
176         struct inet_sock *inet;
177         /* We may need to bind the socket. */
178         lock_sock(sk);
179         inet = inet_sk(sk);
180         if (!inet->inet_num) {
181                 if (sk->sk_prot->get_port(sk, 0)) {
182                         release_sock(sk);
183                         return -EAGAIN;
184                 }
185                 inet->inet_sport = htons(inet->inet_num);
186         }
187         release_sock(sk);
188         return 0;
189 }
190 
191 /*
192  *      Move a socket into listening state.
193  */
194 int inet_listen(struct socket *sock, int backlog)
195 {
196         struct sock *sk = sock->sk;
197         unsigned char old_state;
198         int err;
199 
200         lock_sock(sk);
201 
202         err = -EINVAL;
203         if (sock->state != SS_UNCONNECTED || sock->type != SOCK_STREAM)
204                 goto out;
205 
206         old_state = sk->sk_state;
207         if (!((1 << old_state) & (TCPF_CLOSE | TCPF_LISTEN)))
208                 goto out;
209 
210         /* Really, if the socket is already in listen state
211          * we can only allow the backlog to be adjusted.
212          */
213         if (old_state != TCP_LISTEN) {
214                 /* Enable TFO w/o requiring TCP_FASTOPEN socket option.
215                  * Note that only TCP sockets (SOCK_STREAM) will reach here.
216                  * Also fastopen backlog may already been set via the option
217                  * because the socket was in TCP_LISTEN state previously but
218                  * was shutdown() rather than close().
219                  */
220                 if ((sysctl_tcp_fastopen & TFO_SERVER_WO_SOCKOPT1) &&
221                     (sysctl_tcp_fastopen & TFO_SERVER_ENABLE) &&
222                     !inet_csk(sk)->icsk_accept_queue.fastopenq.max_qlen) {
223                         fastopen_queue_tune(sk, backlog);
224                         tcp_fastopen_init_key_once(true);
225                 }
226 
227                 err = inet_csk_listen_start(sk, backlog);
228                 if (err)
229                         goto out;
230         }
231         sk->sk_max_ack_backlog = backlog;
232         err = 0;
233 
234 out:
235         release_sock(sk);
236         return err;
237 }
238 EXPORT_SYMBOL(inet_listen);
239 
240 /*
241  *      Create an inet socket.
242  */
243 
244 static int inet_create(struct net *net, struct socket *sock, int protocol,
245                        int kern)
246 {
247         struct sock *sk;
248         struct inet_protosw *answer;
249         struct inet_sock *inet;
250         struct proto *answer_prot;
251         unsigned char answer_flags;
252         int try_loading_module = 0;
253         int err;
254 
255         if (protocol < 0 || protocol >= IPPROTO_MAX)
256                 return -EINVAL;
257 
258         sock->state = SS_UNCONNECTED;
259 
260         /* Look for the requested type/protocol pair. */
261 lookup_protocol:
262         err = -ESOCKTNOSUPPORT;
263         rcu_read_lock();
264         list_for_each_entry_rcu(answer, &inetsw[sock->type], list) {
265 
266                 err = 0;
267                 /* Check the non-wild match. */
268                 if (protocol == answer->protocol) {
269                         if (protocol != IPPROTO_IP)
270                                 break;
271                 } else {
272                         /* Check for the two wild cases. */
273                         if (IPPROTO_IP == protocol) {
274                                 protocol = answer->protocol;
275                                 break;
276                         }
277                         if (IPPROTO_IP == answer->protocol)
278                                 break;
279                 }
280                 err = -EPROTONOSUPPORT;
281         }
282 
283         if (unlikely(err)) {
284                 if (try_loading_module < 2) {
285                         rcu_read_unlock();
286                         /*
287                          * Be more specific, e.g. net-pf-2-proto-132-type-1
288                          * (net-pf-PF_INET-proto-IPPROTO_SCTP-type-SOCK_STREAM)
289                          */
290                         if (++try_loading_module == 1)
291                                 request_module("net-pf-%d-proto-%d-type-%d",
292                                                PF_INET, protocol, sock->type);
293                         /*
294                          * Fall back to generic, e.g. net-pf-2-proto-132
295                          * (net-pf-PF_INET-proto-IPPROTO_SCTP)
296                          */
297                         else
298                                 request_module("net-pf-%d-proto-%d",
299                                                PF_INET, protocol);
300                         goto lookup_protocol;
301                 } else
302                         goto out_rcu_unlock;
303         }
304 
305         err = -EPERM;
306         if (sock->type == SOCK_RAW && !kern &&
307             !ns_capable(net->user_ns, CAP_NET_RAW))
308                 goto out_rcu_unlock;
309 
310         sock->ops = answer->ops;
311         answer_prot = answer->prot;
312         answer_flags = answer->flags;
313         rcu_read_unlock();
314 
315         WARN_ON(!answer_prot->slab);
316 
317         err = -ENOBUFS;
318         sk = sk_alloc(net, PF_INET, GFP_KERNEL, answer_prot, kern);
319         if (!sk)
320                 goto out;
321 
322         err = 0;
323         if (INET_PROTOSW_REUSE & answer_flags)
324                 sk->sk_reuse = SK_CAN_REUSE;
325 
326         inet = inet_sk(sk);
327         inet->is_icsk = (INET_PROTOSW_ICSK & answer_flags) != 0;
328 
329         inet->nodefrag = 0;
330 
331         if (SOCK_RAW == sock->type) {
332                 inet->inet_num = protocol;
333                 if (IPPROTO_RAW == protocol)
334                         inet->hdrincl = 1;
335         }
336 
337         if (net->ipv4.sysctl_ip_no_pmtu_disc)
338                 inet->pmtudisc = IP_PMTUDISC_DONT;
339         else
340                 inet->pmtudisc = IP_PMTUDISC_WANT;
341 
342         inet->inet_id = 0;
343 
344         sock_init_data(sock, sk);
345 
346         sk->sk_destruct    = inet_sock_destruct;
347         sk->sk_protocol    = protocol;
348         sk->sk_backlog_rcv = sk->sk_prot->backlog_rcv;
349 
350         inet->uc_ttl    = -1;
351         inet->mc_loop   = 1;
352         inet->mc_ttl    = 1;
353         inet->mc_all    = 1;
354         inet->mc_index  = 0;
355         inet->mc_list   = NULL;
356         inet->rcv_tos   = 0;
357 
358         sk_refcnt_debug_inc(sk);
359 
360         if (inet->inet_num) {
361                 /* It assumes that any protocol which allows
362                  * the user to assign a number at socket
363                  * creation time automatically
364                  * shares.
365                  */
366                 inet->inet_sport = htons(inet->inet_num);
367                 /* Add to protocol hash chains. */
368                 err = sk->sk_prot->hash(sk);
369                 if (err) {
370                         sk_common_release(sk);
371                         goto out;
372                 }
373         }
374 
375         if (sk->sk_prot->init) {
376                 err = sk->sk_prot->init(sk);
377                 if (err) {
378                         sk_common_release(sk);
379                         goto out;
380                 }
381         }
382 
383         if (!kern) {
384                 err = BPF_CGROUP_RUN_PROG_INET_SOCK(sk);
385                 if (err) {
386                         sk_common_release(sk);
387                         goto out;
388                 }
389         }
390 out:
391         return err;
392 out_rcu_unlock:
393         rcu_read_unlock();
394         goto out;
395 }
396 
397 
398 /*
399  *      The peer socket should always be NULL (or else). When we call this
400  *      function we are destroying the object and from then on nobody
401  *      should refer to it.
402  */
403 int inet_release(struct socket *sock)
404 {
405         struct sock *sk = sock->sk;
406 
407         if (sk) {
408                 long timeout;
409 
410                 /* Applications forget to leave groups before exiting */
411                 ip_mc_drop_socket(sk);
412 
413                 /* If linger is set, we don't return until the close
414                  * is complete.  Otherwise we return immediately. The
415                  * actually closing is done the same either way.
416                  *
417                  * If the close is due to the process exiting, we never
418                  * linger..
419                  */
420                 timeout = 0;
421                 if (sock_flag(sk, SOCK_LINGER) &&
422                     !(current->flags & PF_EXITING))
423                         timeout = sk->sk_lingertime;
424                 sock->sk = NULL;
425                 sk->sk_prot->close(sk, timeout);
426         }
427         return 0;
428 }
429 EXPORT_SYMBOL(inet_release);
430 
431 int inet_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
432 {
433         struct sockaddr_in *addr = (struct sockaddr_in *)uaddr;
434         struct sock *sk = sock->sk;
435         struct inet_sock *inet = inet_sk(sk);
436         struct net *net = sock_net(sk);
437         unsigned short snum;
438         int chk_addr_ret;
439         u32 tb_id = RT_TABLE_LOCAL;
440         int err;
441 
442         /* If the socket has its own bind function then use it. (RAW) */
443         if (sk->sk_prot->bind) {
444                 err = sk->sk_prot->bind(sk, uaddr, addr_len);
445                 goto out;
446         }
447         err = -EINVAL;
448         if (addr_len < sizeof(struct sockaddr_in))
449                 goto out;
450 
451         if (addr->sin_family != AF_INET) {
452                 /* Compatibility games : accept AF_UNSPEC (mapped to AF_INET)
453                  * only if s_addr is INADDR_ANY.
454                  */
455                 err = -EAFNOSUPPORT;
456                 if (addr->sin_family != AF_UNSPEC ||
457                     addr->sin_addr.s_addr != htonl(INADDR_ANY))
458                         goto out;
459         }
460 
461         tb_id = l3mdev_fib_table_by_index(net, sk->sk_bound_dev_if) ? : tb_id;
462         chk_addr_ret = inet_addr_type_table(net, addr->sin_addr.s_addr, tb_id);
463 
464         /* Not specified by any standard per-se, however it breaks too
465          * many applications when removed.  It is unfortunate since
466          * allowing applications to make a non-local bind solves
467          * several problems with systems using dynamic addressing.
468          * (ie. your servers still start up even if your ISDN link
469          *  is temporarily down)
470          */
471         err = -EADDRNOTAVAIL;
472         if (!net->ipv4.sysctl_ip_nonlocal_bind &&
473             !(inet->freebind || inet->transparent) &&
474             addr->sin_addr.s_addr != htonl(INADDR_ANY) &&
475             chk_addr_ret != RTN_LOCAL &&
476             chk_addr_ret != RTN_MULTICAST &&
477             chk_addr_ret != RTN_BROADCAST)
478                 goto out;
479 
480         snum = ntohs(addr->sin_port);
481         err = -EACCES;
482         if (snum && snum < inet_prot_sock(net) &&
483             !ns_capable(net->user_ns, CAP_NET_BIND_SERVICE))
484                 goto out;
485 
486         /*      We keep a pair of addresses. rcv_saddr is the one
487          *      used by hash lookups, and saddr is used for transmit.
488          *
489          *      In the BSD API these are the same except where it
490          *      would be illegal to use them (multicast/broadcast) in
491          *      which case the sending device address is used.
492          */
493         lock_sock(sk);
494 
495         /* Check these errors (active socket, double bind). */
496         err = -EINVAL;
497         if (sk->sk_state != TCP_CLOSE || inet->inet_num)
498                 goto out_release_sock;
499 
500         inet->inet_rcv_saddr = inet->inet_saddr = addr->sin_addr.s_addr;
501         if (chk_addr_ret == RTN_MULTICAST || chk_addr_ret == RTN_BROADCAST)
502                 inet->inet_saddr = 0;  /* Use device */
503 
504         /* Make sure we are allowed to bind here. */
505         if ((snum || !inet->bind_address_no_port) &&
506             sk->sk_prot->get_port(sk, snum)) {
507                 inet->inet_saddr = inet->inet_rcv_saddr = 0;
508                 err = -EADDRINUSE;
509                 goto out_release_sock;
510         }
511 
512         if (inet->inet_rcv_saddr)
513                 sk->sk_userlocks |= SOCK_BINDADDR_LOCK;
514         if (snum)
515                 sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
516         inet->inet_sport = htons(inet->inet_num);
517         inet->inet_daddr = 0;
518         inet->inet_dport = 0;
519         sk_dst_reset(sk);
520         err = 0;
521 out_release_sock:
522         release_sock(sk);
523 out:
524         return err;
525 }
526 EXPORT_SYMBOL(inet_bind);
527 
528 int inet_dgram_connect(struct socket *sock, struct sockaddr *uaddr,
529                        int addr_len, int flags)
530 {
531         struct sock *sk = sock->sk;
532 
533         if (addr_len < sizeof(uaddr->sa_family))
534                 return -EINVAL;
535         if (uaddr->sa_family == AF_UNSPEC)
536                 return sk->sk_prot->disconnect(sk, flags);
537 
538         if (!inet_sk(sk)->inet_num && inet_autobind(sk))
539                 return -EAGAIN;
540         return sk->sk_prot->connect(sk, uaddr, addr_len);
541 }
542 EXPORT_SYMBOL(inet_dgram_connect);
543 
544 static long inet_wait_for_connect(struct sock *sk, long timeo, int writebias)
545 {
546         DEFINE_WAIT_FUNC(wait, woken_wake_function);
547 
548         add_wait_queue(sk_sleep(sk), &wait);
549         sk->sk_write_pending += writebias;
550 
551         /* Basic assumption: if someone sets sk->sk_err, he _must_
552          * change state of the socket from TCP_SYN_*.
553          * Connect() does not allow to get error notifications
554          * without closing the socket.
555          */
556         while ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV)) {
557                 release_sock(sk);
558                 timeo = wait_woken(&wait, TASK_INTERRUPTIBLE, timeo);
559                 lock_sock(sk);
560                 if (signal_pending(current) || !timeo)
561                         break;
562         }
563         remove_wait_queue(sk_sleep(sk), &wait);
564         sk->sk_write_pending -= writebias;
565         return timeo;
566 }
567 
568 /*
569  *      Connect to a remote host. There is regrettably still a little
570  *      TCP 'magic' in here.
571  */
572 int __inet_stream_connect(struct socket *sock, struct sockaddr *uaddr,
573                           int addr_len, int flags, int is_sendmsg)
574 {
575         struct sock *sk = sock->sk;
576         int err;
577         long timeo;
578 
579         /*
580          * uaddr can be NULL and addr_len can be 0 if:
581          * sk is a TCP fastopen active socket and
582          * TCP_FASTOPEN_CONNECT sockopt is set and
583          * we already have a valid cookie for this socket.
584          * In this case, user can call write() after connect().
585          * write() will invoke tcp_sendmsg_fastopen() which calls
586          * __inet_stream_connect().
587          */
588         if (uaddr) {
589                 if (addr_len < sizeof(uaddr->sa_family))
590                         return -EINVAL;
591 
592                 if (uaddr->sa_family == AF_UNSPEC) {
593                         err = sk->sk_prot->disconnect(sk, flags);
594                         sock->state = err ? SS_DISCONNECTING : SS_UNCONNECTED;
595                         goto out;
596                 }
597         }
598 
599         switch (sock->state) {
600         default:
601                 err = -EINVAL;
602                 goto out;
603         case SS_CONNECTED:
604                 err = -EISCONN;
605                 goto out;
606         case SS_CONNECTING:
607                 if (inet_sk(sk)->defer_connect)
608                         err = is_sendmsg ? -EINPROGRESS : -EISCONN;
609                 else
610                         err = -EALREADY;
611                 /* Fall out of switch with err, set for this state */
612                 break;
613         case SS_UNCONNECTED:
614                 err = -EISCONN;
615                 if (sk->sk_state != TCP_CLOSE)
616                         goto out;
617 
618                 err = sk->sk_prot->connect(sk, uaddr, addr_len);
619                 if (err < 0)
620                         goto out;
621 
622                 sock->state = SS_CONNECTING;
623 
624                 if (!err && inet_sk(sk)->defer_connect)
625                         goto out;
626 
627                 /* Just entered SS_CONNECTING state; the only
628                  * difference is that return value in non-blocking
629                  * case is EINPROGRESS, rather than EALREADY.
630                  */
631                 err = -EINPROGRESS;
632                 break;
633         }
634 
635         timeo = sock_sndtimeo(sk, flags & O_NONBLOCK);
636 
637         if ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV)) {
638                 int writebias = (sk->sk_protocol == IPPROTO_TCP) &&
639                                 tcp_sk(sk)->fastopen_req &&
640                                 tcp_sk(sk)->fastopen_req->data ? 1 : 0;
641 
642                 /* Error code is set above */
643                 if (!timeo || !inet_wait_for_connect(sk, timeo, writebias))
644                         goto out;
645 
646                 err = sock_intr_errno(timeo);
647                 if (signal_pending(current))
648                         goto out;
649         }
650 
651         /* Connection was closed by RST, timeout, ICMP error
652          * or another process disconnected us.
653          */
654         if (sk->sk_state == TCP_CLOSE)
655                 goto sock_error;
656 
657         /* sk->sk_err may be not zero now, if RECVERR was ordered by user
658          * and error was received after socket entered established state.
659          * Hence, it is handled normally after connect() return successfully.
660          */
661 
662         sock->state = SS_CONNECTED;
663         err = 0;
664 out:
665         return err;
666 
667 sock_error:
668         err = sock_error(sk) ? : -ECONNABORTED;
669         sock->state = SS_UNCONNECTED;
670         if (sk->sk_prot->disconnect(sk, flags))
671                 sock->state = SS_DISCONNECTING;
672         goto out;
673 }
674 EXPORT_SYMBOL(__inet_stream_connect);
675 
676 int inet_stream_connect(struct socket *sock, struct sockaddr *uaddr,
677                         int addr_len, int flags)
678 {
679         int err;
680 
681         lock_sock(sock->sk);
682         err = __inet_stream_connect(sock, uaddr, addr_len, flags, 0);
683         release_sock(sock->sk);
684         return err;
685 }
686 EXPORT_SYMBOL(inet_stream_connect);
687 
688 /*
689  *      Accept a pending connection. The TCP layer now gives BSD semantics.
690  */
691 
692 int inet_accept(struct socket *sock, struct socket *newsock, int flags,
693                 bool kern)
694 {
695         struct sock *sk1 = sock->sk;
696         int err = -EINVAL;
697         struct sock *sk2 = sk1->sk_prot->accept(sk1, flags, &err, kern);
698 
699         if (!sk2)
700                 goto do_err;
701 
702         lock_sock(sk2);
703 
704         sock_rps_record_flow(sk2);
705         WARN_ON(!((1 << sk2->sk_state) &
706                   (TCPF_ESTABLISHED | TCPF_SYN_RECV |
707                   TCPF_CLOSE_WAIT | TCPF_CLOSE)));
708 
709         sock_graft(sk2, newsock);
710 
711         newsock->state = SS_CONNECTED;
712         err = 0;
713         release_sock(sk2);
714 do_err:
715         return err;
716 }
717 EXPORT_SYMBOL(inet_accept);
718 
719 
720 /*
721  *      This does both peername and sockname.
722  */
723 int inet_getname(struct socket *sock, struct sockaddr *uaddr,
724                         int *uaddr_len, int peer)
725 {
726         struct sock *sk         = sock->sk;
727         struct inet_sock *inet  = inet_sk(sk);
728         DECLARE_SOCKADDR(struct sockaddr_in *, sin, uaddr);
729 
730         sin->sin_family = AF_INET;
731         if (peer) {
732                 if (!inet->inet_dport ||
733                     (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) &&
734                      peer == 1))
735                         return -ENOTCONN;
736                 sin->sin_port = inet->inet_dport;
737                 sin->sin_addr.s_addr = inet->inet_daddr;
738         } else {
739                 __be32 addr = inet->inet_rcv_saddr;
740                 if (!addr)
741                         addr = inet->inet_saddr;
742                 sin->sin_port = inet->inet_sport;
743                 sin->sin_addr.s_addr = addr;
744         }
745         memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
746         *uaddr_len = sizeof(*sin);
747         return 0;
748 }
749 EXPORT_SYMBOL(inet_getname);
750 
751 int inet_sendmsg(struct socket *sock, struct msghdr *msg, size_t size)
752 {
753         struct sock *sk = sock->sk;
754 
755         sock_rps_record_flow(sk);
756 
757         /* We may need to bind the socket. */
758         if (!inet_sk(sk)->inet_num && !sk->sk_prot->no_autobind &&
759             inet_autobind(sk))
760                 return -EAGAIN;
761 
762         return sk->sk_prot->sendmsg(sk, msg, size);
763 }
764 EXPORT_SYMBOL(inet_sendmsg);
765 
766 ssize_t inet_sendpage(struct socket *sock, struct page *page, int offset,
767                       size_t size, int flags)
768 {
769         struct sock *sk = sock->sk;
770 
771         sock_rps_record_flow(sk);
772 
773         /* We may need to bind the socket. */
774         if (!inet_sk(sk)->inet_num && !sk->sk_prot->no_autobind &&
775             inet_autobind(sk))
776                 return -EAGAIN;
777 
778         if (sk->sk_prot->sendpage)
779                 return sk->sk_prot->sendpage(sk, page, offset, size, flags);
780         return sock_no_sendpage(sock, page, offset, size, flags);
781 }
782 EXPORT_SYMBOL(inet_sendpage);
783 
784 int inet_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
785                  int flags)
786 {
787         struct sock *sk = sock->sk;
788         int addr_len = 0;
789         int err;
790 
791         sock_rps_record_flow(sk);
792 
793         err = sk->sk_prot->recvmsg(sk, msg, size, flags & MSG_DONTWAIT,
794                                    flags & ~MSG_DONTWAIT, &addr_len);
795         if (err >= 0)
796                 msg->msg_namelen = addr_len;
797         return err;
798 }
799 EXPORT_SYMBOL(inet_recvmsg);
800 
801 int inet_shutdown(struct socket *sock, int how)
802 {
803         struct sock *sk = sock->sk;
804         int err = 0;
805 
806         /* This should really check to make sure
807          * the socket is a TCP socket. (WHY AC...)
808          */
809         how++; /* maps 0->1 has the advantage of making bit 1 rcvs and
810                        1->2 bit 2 snds.
811                        2->3 */
812         if ((how & ~SHUTDOWN_MASK) || !how)     /* MAXINT->0 */
813                 return -EINVAL;
814 
815         lock_sock(sk);
816         if (sock->state == SS_CONNECTING) {
817                 if ((1 << sk->sk_state) &
818                     (TCPF_SYN_SENT | TCPF_SYN_RECV | TCPF_CLOSE))
819                         sock->state = SS_DISCONNECTING;
820                 else
821                         sock->state = SS_CONNECTED;
822         }
823 
824         switch (sk->sk_state) {
825         case TCP_CLOSE:
826                 err = -ENOTCONN;
827                 /* Hack to wake up other listeners, who can poll for
828                    POLLHUP, even on eg. unconnected UDP sockets -- RR */
829         default:
830                 sk->sk_shutdown |= how;
831                 if (sk->sk_prot->shutdown)
832                         sk->sk_prot->shutdown(sk, how);
833                 break;
834 
835         /* Remaining two branches are temporary solution for missing
836          * close() in multithreaded environment. It is _not_ a good idea,
837          * but we have no choice until close() is repaired at VFS level.
838          */
839         case TCP_LISTEN:
840                 if (!(how & RCV_SHUTDOWN))
841                         break;
842                 /* Fall through */
843         case TCP_SYN_SENT:
844                 err = sk->sk_prot->disconnect(sk, O_NONBLOCK);
845                 sock->state = err ? SS_DISCONNECTING : SS_UNCONNECTED;
846                 break;
847         }
848 
849         /* Wake up anyone sleeping in poll. */
850         sk->sk_state_change(sk);
851         release_sock(sk);
852         return err;
853 }
854 EXPORT_SYMBOL(inet_shutdown);
855 
856 /*
857  *      ioctl() calls you can issue on an INET socket. Most of these are
858  *      device configuration and stuff and very rarely used. Some ioctls
859  *      pass on to the socket itself.
860  *
861  *      NOTE: I like the idea of a module for the config stuff. ie ifconfig
862  *      loads the devconfigure module does its configuring and unloads it.
863  *      There's a good 20K of config code hanging around the kernel.
864  */
865 
866 int inet_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
867 {
868         struct sock *sk = sock->sk;
869         int err = 0;
870         struct net *net = sock_net(sk);
871 
872         switch (cmd) {
873         case SIOCGSTAMP:
874                 err = sock_get_timestamp(sk, (struct timeval __user *)arg);
875                 break;
876         case SIOCGSTAMPNS:
877                 err = sock_get_timestampns(sk, (struct timespec __user *)arg);
878                 break;
879         case SIOCADDRT:
880         case SIOCDELRT:
881         case SIOCRTMSG:
882                 err = ip_rt_ioctl(net, cmd, (void __user *)arg);
883                 break;
884         case SIOCDARP:
885         case SIOCGARP:
886         case SIOCSARP:
887                 err = arp_ioctl(net, cmd, (void __user *)arg);
888                 break;
889         case SIOCGIFADDR:
890         case SIOCSIFADDR:
891         case SIOCGIFBRDADDR:
892         case SIOCSIFBRDADDR:
893         case SIOCGIFNETMASK:
894         case SIOCSIFNETMASK:
895         case SIOCGIFDSTADDR:
896         case SIOCSIFDSTADDR:
897         case SIOCSIFPFLAGS:
898         case SIOCGIFPFLAGS:
899         case SIOCSIFFLAGS:
900                 err = devinet_ioctl(net, cmd, (void __user *)arg);
901                 break;
902         default:
903                 if (sk->sk_prot->ioctl)
904                         err = sk->sk_prot->ioctl(sk, cmd, arg);
905                 else
906                         err = -ENOIOCTLCMD;
907                 break;
908         }
909         return err;
910 }
911 EXPORT_SYMBOL(inet_ioctl);
912 
913 #ifdef CONFIG_COMPAT
914 static int inet_compat_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
915 {
916         struct sock *sk = sock->sk;
917         int err = -ENOIOCTLCMD;
918 
919         if (sk->sk_prot->compat_ioctl)
920                 err = sk->sk_prot->compat_ioctl(sk, cmd, arg);
921 
922         return err;
923 }
924 #endif
925 
926 const struct proto_ops inet_stream_ops = {
927         .family            = PF_INET,
928         .owner             = THIS_MODULE,
929         .release           = inet_release,
930         .bind              = inet_bind,
931         .connect           = inet_stream_connect,
932         .socketpair        = sock_no_socketpair,
933         .accept            = inet_accept,
934         .getname           = inet_getname,
935         .poll              = tcp_poll,
936         .ioctl             = inet_ioctl,
937         .listen            = inet_listen,
938         .shutdown          = inet_shutdown,
939         .setsockopt        = sock_common_setsockopt,
940         .getsockopt        = sock_common_getsockopt,
941         .sendmsg           = inet_sendmsg,
942         .recvmsg           = inet_recvmsg,
943         .mmap              = sock_no_mmap,
944         .sendpage          = inet_sendpage,
945         .splice_read       = tcp_splice_read,
946         .read_sock         = tcp_read_sock,
947         .peek_len          = tcp_peek_len,
948 #ifdef CONFIG_COMPAT
949         .compat_setsockopt = compat_sock_common_setsockopt,
950         .compat_getsockopt = compat_sock_common_getsockopt,
951         .compat_ioctl      = inet_compat_ioctl,
952 #endif
953 };
954 EXPORT_SYMBOL(inet_stream_ops);
955 
956 const struct proto_ops inet_dgram_ops = {
957         .family            = PF_INET,
958         .owner             = THIS_MODULE,
959         .release           = inet_release,
960         .bind              = inet_bind,
961         .connect           = inet_dgram_connect,
962         .socketpair        = sock_no_socketpair,
963         .accept            = sock_no_accept,
964         .getname           = inet_getname,
965         .poll              = udp_poll,
966         .ioctl             = inet_ioctl,
967         .listen            = sock_no_listen,
968         .shutdown          = inet_shutdown,
969         .setsockopt        = sock_common_setsockopt,
970         .getsockopt        = sock_common_getsockopt,
971         .sendmsg           = inet_sendmsg,
972         .recvmsg           = inet_recvmsg,
973         .mmap              = sock_no_mmap,
974         .sendpage          = inet_sendpage,
975         .set_peek_off      = sk_set_peek_off,
976 #ifdef CONFIG_COMPAT
977         .compat_setsockopt = compat_sock_common_setsockopt,
978         .compat_getsockopt = compat_sock_common_getsockopt,
979         .compat_ioctl      = inet_compat_ioctl,
980 #endif
981 };
982 EXPORT_SYMBOL(inet_dgram_ops);
983 
984 /*
985  * For SOCK_RAW sockets; should be the same as inet_dgram_ops but without
986  * udp_poll
987  */
988 static const struct proto_ops inet_sockraw_ops = {
989         .family            = PF_INET,
990         .owner             = THIS_MODULE,
991         .release           = inet_release,
992         .bind              = inet_bind,
993         .connect           = inet_dgram_connect,
994         .socketpair        = sock_no_socketpair,
995         .accept            = sock_no_accept,
996         .getname           = inet_getname,
997         .poll              = datagram_poll,
998         .ioctl             = inet_ioctl,
999         .listen            = sock_no_listen,
1000         .shutdown          = inet_shutdown,
1001         .setsockopt        = sock_common_setsockopt,
1002         .getsockopt        = sock_common_getsockopt,
1003         .sendmsg           = inet_sendmsg,
1004         .recvmsg           = inet_recvmsg,
1005         .mmap              = sock_no_mmap,
1006         .sendpage          = inet_sendpage,
1007 #ifdef CONFIG_COMPAT
1008         .compat_setsockopt = compat_sock_common_setsockopt,
1009         .compat_getsockopt = compat_sock_common_getsockopt,
1010         .compat_ioctl      = inet_compat_ioctl,
1011 #endif
1012 };
1013 
1014 static const struct net_proto_family inet_family_ops = {
1015         .family = PF_INET,
1016         .create = inet_create,
1017         .owner  = THIS_MODULE,
1018 };
1019 
1020 /* Upon startup we insert all the elements in inetsw_array[] into
1021  * the linked list inetsw.
1022  */
1023 static struct inet_protosw inetsw_array[] =
1024 {
1025         {
1026                 .type =       SOCK_STREAM,
1027                 .protocol =   IPPROTO_TCP,
1028                 .prot =       &tcp_prot,
1029                 .ops =        &inet_stream_ops,
1030                 .flags =      INET_PROTOSW_PERMANENT |
1031                               INET_PROTOSW_ICSK,
1032         },
1033 
1034         {
1035                 .type =       SOCK_DGRAM,
1036                 .protocol =   IPPROTO_UDP,
1037                 .prot =       &udp_prot,
1038                 .ops =        &inet_dgram_ops,
1039                 .flags =      INET_PROTOSW_PERMANENT,
1040        },
1041 
1042        {
1043                 .type =       SOCK_DGRAM,
1044                 .protocol =   IPPROTO_ICMP,
1045                 .prot =       &ping_prot,
1046                 .ops =        &inet_sockraw_ops,
1047                 .flags =      INET_PROTOSW_REUSE,
1048        },
1049 
1050        {
1051                .type =       SOCK_RAW,
1052                .protocol =   IPPROTO_IP,        /* wild card */
1053                .prot =       &raw_prot,
1054                .ops =        &inet_sockraw_ops,
1055                .flags =      INET_PROTOSW_REUSE,
1056        }
1057 };
1058 
1059 #define INETSW_ARRAY_LEN ARRAY_SIZE(inetsw_array)
1060 
1061 void inet_register_protosw(struct inet_protosw *p)
1062 {
1063         struct list_head *lh;
1064         struct inet_protosw *answer;
1065         int protocol = p->protocol;
1066         struct list_head *last_perm;
1067 
1068         spin_lock_bh(&inetsw_lock);
1069 
1070         if (p->type >= SOCK_MAX)
1071                 goto out_illegal;
1072 
1073         /* If we are trying to override a permanent protocol, bail. */
1074         last_perm = &inetsw[p->type];
1075         list_for_each(lh, &inetsw[p->type]) {
1076                 answer = list_entry(lh, struct inet_protosw, list);
1077                 /* Check only the non-wild match. */
1078                 if ((INET_PROTOSW_PERMANENT & answer->flags) == 0)
1079                         break;
1080                 if (protocol == answer->protocol)
1081                         goto out_permanent;
1082                 last_perm = lh;
1083         }
1084 
1085         /* Add the new entry after the last permanent entry if any, so that
1086          * the new entry does not override a permanent entry when matched with
1087          * a wild-card protocol. But it is allowed to override any existing
1088          * non-permanent entry.  This means that when we remove this entry, the
1089          * system automatically returns to the old behavior.
1090          */
1091         list_add_rcu(&p->list, last_perm);
1092 out:
1093         spin_unlock_bh(&inetsw_lock);
1094 
1095         return;
1096 
1097 out_permanent:
1098         pr_err("Attempt to override permanent protocol %d\n", protocol);
1099         goto out;
1100 
1101 out_illegal:
1102         pr_err("Ignoring attempt to register invalid socket type %d\n",
1103                p->type);
1104         goto out;
1105 }
1106 EXPORT_SYMBOL(inet_register_protosw);
1107 
1108 void inet_unregister_protosw(struct inet_protosw *p)
1109 {
1110         if (INET_PROTOSW_PERMANENT & p->flags) {
1111                 pr_err("Attempt to unregister permanent protocol %d\n",
1112                        p->protocol);
1113         } else {
1114                 spin_lock_bh(&inetsw_lock);
1115                 list_del_rcu(&p->list);
1116                 spin_unlock_bh(&inetsw_lock);
1117 
1118                 synchronize_net();
1119         }
1120 }
1121 EXPORT_SYMBOL(inet_unregister_protosw);
1122 
1123 static int inet_sk_reselect_saddr(struct sock *sk)
1124 {
1125         struct inet_sock *inet = inet_sk(sk);
1126         __be32 old_saddr = inet->inet_saddr;
1127         __be32 daddr = inet->inet_daddr;
1128         struct flowi4 *fl4;
1129         struct rtable *rt;
1130         __be32 new_saddr;
1131         struct ip_options_rcu *inet_opt;
1132 
1133         inet_opt = rcu_dereference_protected(inet->inet_opt,
1134                                              lockdep_sock_is_held(sk));
1135         if (inet_opt && inet_opt->opt.srr)
1136                 daddr = inet_opt->opt.faddr;
1137 
1138         /* Query new route. */
1139         fl4 = &inet->cork.fl.u.ip4;
1140         rt = ip_route_connect(fl4, daddr, 0, RT_CONN_FLAGS(sk),
1141                               sk->sk_bound_dev_if, sk->sk_protocol,
1142                               inet->inet_sport, inet->inet_dport, sk);
1143         if (IS_ERR(rt))
1144                 return PTR_ERR(rt);
1145 
1146         sk_setup_caps(sk, &rt->dst);
1147 
1148         new_saddr = fl4->saddr;
1149 
1150         if (new_saddr == old_saddr)
1151                 return 0;
1152 
1153         if (sock_net(sk)->ipv4.sysctl_ip_dynaddr > 1) {
1154                 pr_info("%s(): shifting inet->saddr from %pI4 to %pI4\n",
1155                         __func__, &old_saddr, &new_saddr);
1156         }
1157 
1158         inet->inet_saddr = inet->inet_rcv_saddr = new_saddr;
1159 
1160         /*
1161          * XXX The only one ugly spot where we need to
1162          * XXX really change the sockets identity after
1163          * XXX it has entered the hashes. -DaveM
1164          *
1165          * Besides that, it does not check for connection
1166          * uniqueness. Wait for troubles.
1167          */
1168         return __sk_prot_rehash(sk);
1169 }
1170 
1171 int inet_sk_rebuild_header(struct sock *sk)
1172 {
1173         struct inet_sock *inet = inet_sk(sk);
1174         struct rtable *rt = (struct rtable *)__sk_dst_check(sk, 0);
1175         __be32 daddr;
1176         struct ip_options_rcu *inet_opt;
1177         struct flowi4 *fl4;
1178         int err;
1179 
1180         /* Route is OK, nothing to do. */
1181         if (rt)
1182                 return 0;
1183 
1184         /* Reroute. */
1185         rcu_read_lock();
1186         inet_opt = rcu_dereference(inet->inet_opt);
1187         daddr = inet->inet_daddr;
1188         if (inet_opt && inet_opt->opt.srr)
1189                 daddr = inet_opt->opt.faddr;
1190         rcu_read_unlock();
1191         fl4 = &inet->cork.fl.u.ip4;
1192         rt = ip_route_output_ports(sock_net(sk), fl4, sk, daddr, inet->inet_saddr,
1193                                    inet->inet_dport, inet->inet_sport,
1194                                    sk->sk_protocol, RT_CONN_FLAGS(sk),
1195                                    sk->sk_bound_dev_if);
1196         if (!IS_ERR(rt)) {
1197                 err = 0;
1198                 sk_setup_caps(sk, &rt->dst);
1199         } else {
1200                 err = PTR_ERR(rt);
1201 
1202                 /* Routing failed... */
1203                 sk->sk_route_caps = 0;
1204                 /*
1205                  * Other protocols have to map its equivalent state to TCP_SYN_SENT.
1206                  * DCCP maps its DCCP_REQUESTING state to TCP_SYN_SENT. -acme
1207                  */
1208                 if (!sock_net(sk)->ipv4.sysctl_ip_dynaddr ||
1209                     sk->sk_state != TCP_SYN_SENT ||
1210                     (sk->sk_userlocks & SOCK_BINDADDR_LOCK) ||
1211                     (err = inet_sk_reselect_saddr(sk)) != 0)
1212                         sk->sk_err_soft = -err;
1213         }
1214 
1215         return err;
1216 }
1217 EXPORT_SYMBOL(inet_sk_rebuild_header);
1218 
1219 struct sk_buff *inet_gso_segment(struct sk_buff *skb,
1220                                  netdev_features_t features)
1221 {
1222         bool udpfrag = false, fixedid = false, gso_partial, encap;
1223         struct sk_buff *segs = ERR_PTR(-EINVAL);
1224         const struct net_offload *ops;
1225         unsigned int offset = 0;
1226         struct iphdr *iph;
1227         int proto, tot_len;
1228         int nhoff;
1229         int ihl;
1230         int id;
1231 
1232         skb_reset_network_header(skb);
1233         nhoff = skb_network_header(skb) - skb_mac_header(skb);
1234         if (unlikely(!pskb_may_pull(skb, sizeof(*iph))))
1235                 goto out;
1236 
1237         iph = ip_hdr(skb);
1238         ihl = iph->ihl * 4;
1239         if (ihl < sizeof(*iph))
1240                 goto out;
1241 
1242         id = ntohs(iph->id);
1243         proto = iph->protocol;
1244 
1245         /* Warning: after this point, iph might be no longer valid */
1246         if (unlikely(!pskb_may_pull(skb, ihl)))
1247                 goto out;
1248         __skb_pull(skb, ihl);
1249 
1250         encap = SKB_GSO_CB(skb)->encap_level > 0;
1251         if (encap)
1252                 features &= skb->dev->hw_enc_features;
1253         SKB_GSO_CB(skb)->encap_level += ihl;
1254 
1255         skb_reset_transport_header(skb);
1256 
1257         segs = ERR_PTR(-EPROTONOSUPPORT);
1258 
1259         if (!skb->encapsulation || encap) {
1260                 udpfrag = !!(skb_shinfo(skb)->gso_type & SKB_GSO_UDP);
1261                 fixedid = !!(skb_shinfo(skb)->gso_type & SKB_GSO_TCP_FIXEDID);
1262 
1263                 /* fixed ID is invalid if DF bit is not set */
1264                 if (fixedid && !(ip_hdr(skb)->frag_off & htons(IP_DF)))
1265                         goto out;
1266         }
1267 
1268         ops = rcu_dereference(inet_offloads[proto]);
1269         if (likely(ops && ops->callbacks.gso_segment))
1270                 segs = ops->callbacks.gso_segment(skb, features);
1271 
1272         if (IS_ERR_OR_NULL(segs))
1273                 goto out;
1274 
1275         gso_partial = !!(skb_shinfo(segs)->gso_type & SKB_GSO_PARTIAL);
1276 
1277         skb = segs;
1278         do {
1279                 iph = (struct iphdr *)(skb_mac_header(skb) + nhoff);
1280                 if (udpfrag) {
1281                         iph->frag_off = htons(offset >> 3);
1282                         if (skb->next)
1283                                 iph->frag_off |= htons(IP_MF);
1284                         offset += skb->len - nhoff - ihl;
1285                         tot_len = skb->len - nhoff;
1286                 } else if (skb_is_gso(skb)) {
1287                         if (!fixedid) {
1288                                 iph->id = htons(id);
1289                                 id += skb_shinfo(skb)->gso_segs;
1290                         }
1291 
1292                         if (gso_partial)
1293                                 tot_len = skb_shinfo(skb)->gso_size +
1294                                           SKB_GSO_CB(skb)->data_offset +
1295                                           skb->head - (unsigned char *)iph;
1296                         else
1297                                 tot_len = skb->len - nhoff;
1298                 } else {
1299                         if (!fixedid)
1300                                 iph->id = htons(id++);
1301                         tot_len = skb->len - nhoff;
1302                 }
1303                 iph->tot_len = htons(tot_len);
1304                 ip_send_check(iph);
1305                 if (encap)
1306                         skb_reset_inner_headers(skb);
1307                 skb->network_header = (u8 *)iph - skb->head;
1308         } while ((skb = skb->next));
1309 
1310 out:
1311         return segs;
1312 }
1313 EXPORT_SYMBOL(inet_gso_segment);
1314 
1315 struct sk_buff **inet_gro_receive(struct sk_buff **head, struct sk_buff *skb)
1316 {
1317         const struct net_offload *ops;
1318         struct sk_buff **pp = NULL;
1319         struct sk_buff *p;
1320         const struct iphdr *iph;
1321         unsigned int hlen;
1322         unsigned int off;
1323         unsigned int id;
1324         int flush = 1;
1325         int proto;
1326 
1327         off = skb_gro_offset(skb);
1328         hlen = off + sizeof(*iph);
1329         iph = skb_gro_header_fast(skb, off);
1330         if (skb_gro_header_hard(skb, hlen)) {
1331                 iph = skb_gro_header_slow(skb, hlen, off);
1332                 if (unlikely(!iph))
1333                         goto out;
1334         }
1335 
1336         proto = iph->protocol;
1337 
1338         rcu_read_lock();
1339         ops = rcu_dereference(inet_offloads[proto]);
1340         if (!ops || !ops->callbacks.gro_receive)
1341                 goto out_unlock;
1342 
1343         if (*(u8 *)iph != 0x45)
1344                 goto out_unlock;
1345 
1346         if (ip_is_fragment(iph))
1347                 goto out_unlock;
1348 
1349         if (unlikely(ip_fast_csum((u8 *)iph, 5)))
1350                 goto out_unlock;
1351 
1352         id = ntohl(*(__be32 *)&iph->id);
1353         flush = (u16)((ntohl(*(__be32 *)iph) ^ skb_gro_len(skb)) | (id & ~IP_DF));
1354         id >>= 16;
1355 
1356         for (p = *head; p; p = p->next) {
1357                 struct iphdr *iph2;
1358                 u16 flush_id;
1359 
1360                 if (!NAPI_GRO_CB(p)->same_flow)
1361                         continue;
1362 
1363                 iph2 = (struct iphdr *)(p->data + off);
1364                 /* The above works because, with the exception of the top
1365                  * (inner most) layer, we only aggregate pkts with the same
1366                  * hdr length so all the hdrs we'll need to verify will start
1367                  * at the same offset.
1368                  */
1369                 if ((iph->protocol ^ iph2->protocol) |
1370                     ((__force u32)iph->saddr ^ (__force u32)iph2->saddr) |
1371                     ((__force u32)iph->daddr ^ (__force u32)iph2->daddr)) {
1372                         NAPI_GRO_CB(p)->same_flow = 0;
1373                         continue;
1374                 }
1375 
1376                 /* All fields must match except length and checksum. */
1377                 NAPI_GRO_CB(p)->flush |=
1378                         (iph->ttl ^ iph2->ttl) |
1379                         (iph->tos ^ iph2->tos) |
1380                         ((iph->frag_off ^ iph2->frag_off) & htons(IP_DF));
1381 
1382                 NAPI_GRO_CB(p)->flush |= flush;
1383 
1384                 /* We need to store of the IP ID check to be included later
1385                  * when we can verify that this packet does in fact belong
1386                  * to a given flow.
1387                  */
1388                 flush_id = (u16)(id - ntohs(iph2->id));
1389 
1390                 /* This bit of code makes it much easier for us to identify
1391                  * the cases where we are doing atomic vs non-atomic IP ID
1392                  * checks.  Specifically an atomic check can return IP ID
1393                  * values 0 - 0xFFFF, while a non-atomic check can only
1394                  * return 0 or 0xFFFF.
1395                  */
1396                 if (!NAPI_GRO_CB(p)->is_atomic ||
1397                     !(iph->frag_off & htons(IP_DF))) {
1398                         flush_id ^= NAPI_GRO_CB(p)->count;
1399                         flush_id = flush_id ? 0xFFFF : 0;
1400                 }
1401 
1402                 /* If the previous IP ID value was based on an atomic
1403                  * datagram we can overwrite the value and ignore it.
1404                  */
1405                 if (NAPI_GRO_CB(skb)->is_atomic)
1406                         NAPI_GRO_CB(p)->flush_id = flush_id;
1407                 else
1408                         NAPI_GRO_CB(p)->flush_id |= flush_id;
1409         }
1410 
1411         NAPI_GRO_CB(skb)->is_atomic = !!(iph->frag_off & htons(IP_DF));
1412         NAPI_GRO_CB(skb)->flush |= flush;
1413         skb_set_network_header(skb, off);
1414         /* The above will be needed by the transport layer if there is one
1415          * immediately following this IP hdr.
1416          */
1417 
1418         /* Note : No need to call skb_gro_postpull_rcsum() here,
1419          * as we already checked checksum over ipv4 header was 0
1420          */
1421         skb_gro_pull(skb, sizeof(*iph));
1422         skb_set_transport_header(skb, skb_gro_offset(skb));
1423 
1424         pp = call_gro_receive(ops->callbacks.gro_receive, head, skb);
1425 
1426 out_unlock:
1427         rcu_read_unlock();
1428 
1429 out:
1430         skb_gro_flush_final(skb, pp, flush);
1431 
1432         return pp;
1433 }
1434 EXPORT_SYMBOL(inet_gro_receive);
1435 
1436 static struct sk_buff **ipip_gro_receive(struct sk_buff **head,
1437                                          struct sk_buff *skb)
1438 {
1439         if (NAPI_GRO_CB(skb)->encap_mark) {
1440                 NAPI_GRO_CB(skb)->flush = 1;
1441                 return NULL;
1442         }
1443 
1444         NAPI_GRO_CB(skb)->encap_mark = 1;
1445 
1446         return inet_gro_receive(head, skb);
1447 }
1448 
1449 #define SECONDS_PER_DAY 86400
1450 
1451 /* inet_current_timestamp - Return IP network timestamp
1452  *
1453  * Return milliseconds since midnight in network byte order.
1454  */
1455 __be32 inet_current_timestamp(void)
1456 {
1457         u32 secs;
1458         u32 msecs;
1459         struct timespec64 ts;
1460 
1461         ktime_get_real_ts64(&ts);
1462 
1463         /* Get secs since midnight. */
1464         (void)div_u64_rem(ts.tv_sec, SECONDS_PER_DAY, &secs);
1465         /* Convert to msecs. */
1466         msecs = secs * MSEC_PER_SEC;
1467         /* Convert nsec to msec. */
1468         msecs += (u32)ts.tv_nsec / NSEC_PER_MSEC;
1469 
1470         /* Convert to network byte order. */
1471         return htonl(msecs);
1472 }
1473 EXPORT_SYMBOL(inet_current_timestamp);
1474 
1475 int inet_recv_error(struct sock *sk, struct msghdr *msg, int len, int *addr_len)
1476 {
1477         if (sk->sk_family == AF_INET)
1478                 return ip_recv_error(sk, msg, len, addr_len);
1479 #if IS_ENABLED(CONFIG_IPV6)
1480         if (sk->sk_family == AF_INET6)
1481                 return pingv6_ops.ipv6_recv_error(sk, msg, len, addr_len);
1482 #endif
1483         return -EINVAL;
1484 }
1485 
1486 int inet_gro_complete(struct sk_buff *skb, int nhoff)
1487 {
1488         __be16 newlen = htons(skb->len - nhoff);
1489         struct iphdr *iph = (struct iphdr *)(skb->data + nhoff);
1490         const struct net_offload *ops;
1491         int proto = iph->protocol;
1492         int err = -ENOSYS;
1493 
1494         if (skb->encapsulation) {
1495                 skb_set_inner_protocol(skb, cpu_to_be16(ETH_P_IP));
1496                 skb_set_inner_network_header(skb, nhoff);
1497         }
1498 
1499         csum_replace2(&iph->check, iph->tot_len, newlen);
1500         iph->tot_len = newlen;
1501 
1502         rcu_read_lock();
1503         ops = rcu_dereference(inet_offloads[proto]);
1504         if (WARN_ON(!ops || !ops->callbacks.gro_complete))
1505                 goto out_unlock;
1506 
1507         /* Only need to add sizeof(*iph) to get to the next hdr below
1508          * because any hdr with option will have been flushed in
1509          * inet_gro_receive().
1510          */
1511         err = ops->callbacks.gro_complete(skb, nhoff + sizeof(*iph));
1512 
1513 out_unlock:
1514         rcu_read_unlock();
1515 
1516         return err;
1517 }
1518 EXPORT_SYMBOL(inet_gro_complete);
1519 
1520 static int ipip_gro_complete(struct sk_buff *skb, int nhoff)
1521 {
1522         skb->encapsulation = 1;
1523         skb_shinfo(skb)->gso_type |= SKB_GSO_IPXIP4;
1524         return inet_gro_complete(skb, nhoff);
1525 }
1526 
1527 int inet_ctl_sock_create(struct sock **sk, unsigned short family,
1528                          unsigned short type, unsigned char protocol,
1529                          struct net *net)
1530 {
1531         struct socket *sock;
1532         int rc = sock_create_kern(net, family, type, protocol, &sock);
1533 
1534         if (rc == 0) {
1535                 *sk = sock->sk;
1536                 (*sk)->sk_allocation = GFP_ATOMIC;
1537                 /*
1538                  * Unhash it so that IP input processing does not even see it,
1539                  * we do not wish this socket to see incoming packets.
1540                  */
1541                 (*sk)->sk_prot->unhash(*sk);
1542         }
1543         return rc;
1544 }
1545 EXPORT_SYMBOL_GPL(inet_ctl_sock_create);
1546 
1547 u64 snmp_get_cpu_field(void __percpu *mib, int cpu, int offt)
1548 {
1549         return  *(((unsigned long *)per_cpu_ptr(mib, cpu)) + offt);
1550 }
1551 EXPORT_SYMBOL_GPL(snmp_get_cpu_field);
1552 
1553 unsigned long snmp_fold_field(void __percpu *mib, int offt)
1554 {
1555         unsigned long res = 0;
1556         int i;
1557 
1558         for_each_possible_cpu(i)
1559                 res += snmp_get_cpu_field(mib, i, offt);
1560         return res;
1561 }
1562 EXPORT_SYMBOL_GPL(snmp_fold_field);
1563 
1564 #if BITS_PER_LONG==32
1565 
1566 u64 snmp_get_cpu_field64(void __percpu *mib, int cpu, int offt,
1567                          size_t syncp_offset)
1568 {
1569         void *bhptr;
1570         struct u64_stats_sync *syncp;
1571         u64 v;
1572         unsigned int start;
1573 
1574         bhptr = per_cpu_ptr(mib, cpu);
1575         syncp = (struct u64_stats_sync *)(bhptr + syncp_offset);
1576         do {
1577                 start = u64_stats_fetch_begin_irq(syncp);
1578                 v = *(((u64 *)bhptr) + offt);
1579         } while (u64_stats_fetch_retry_irq(syncp, start));
1580 
1581         return v;
1582 }
1583 EXPORT_SYMBOL_GPL(snmp_get_cpu_field64);
1584 
1585 u64 snmp_fold_field64(void __percpu *mib, int offt, size_t syncp_offset)
1586 {
1587         u64 res = 0;
1588         int cpu;
1589 
1590         for_each_possible_cpu(cpu) {
1591                 res += snmp_get_cpu_field64(mib, cpu, offt, syncp_offset);
1592         }
1593         return res;
1594 }
1595 EXPORT_SYMBOL_GPL(snmp_fold_field64);
1596 #endif
1597 
1598 #ifdef CONFIG_IP_MULTICAST
1599 static const struct net_protocol igmp_protocol = {
1600         .handler =      igmp_rcv,
1601         .netns_ok =     1,
1602 };
1603 #endif
1604 
1605 static struct net_protocol tcp_protocol = {
1606         .early_demux    =       tcp_v4_early_demux,
1607         .early_demux_handler =  tcp_v4_early_demux,
1608         .handler        =       tcp_v4_rcv,
1609         .err_handler    =       tcp_v4_err,
1610         .no_policy      =       1,
1611         .netns_ok       =       1,
1612         .icmp_strict_tag_validation = 1,
1613 };
1614 
1615 static struct net_protocol udp_protocol = {
1616         .early_demux =  udp_v4_early_demux,
1617         .early_demux_handler =  udp_v4_early_demux,
1618         .handler =      udp_rcv,
1619         .err_handler =  udp_err,
1620         .no_policy =    1,
1621         .netns_ok =     1,
1622 };
1623 
1624 static const struct net_protocol icmp_protocol = {
1625         .handler =      icmp_rcv,
1626         .err_handler =  icmp_err,
1627         .no_policy =    1,
1628         .netns_ok =     1,
1629 };
1630 
1631 static __net_init int ipv4_mib_init_net(struct net *net)
1632 {
1633         int i;
1634 
1635         net->mib.tcp_statistics = alloc_percpu(struct tcp_mib);
1636         if (!net->mib.tcp_statistics)
1637                 goto err_tcp_mib;
1638         net->mib.ip_statistics = alloc_percpu(struct ipstats_mib);
1639         if (!net->mib.ip_statistics)
1640                 goto err_ip_mib;
1641 
1642         for_each_possible_cpu(i) {
1643                 struct ipstats_mib *af_inet_stats;
1644                 af_inet_stats = per_cpu_ptr(net->mib.ip_statistics, i);
1645                 u64_stats_init(&af_inet_stats->syncp);
1646         }
1647 
1648         net->mib.net_statistics = alloc_percpu(struct linux_mib);
1649         if (!net->mib.net_statistics)
1650                 goto err_net_mib;
1651         net->mib.udp_statistics = alloc_percpu(struct udp_mib);
1652         if (!net->mib.udp_statistics)
1653                 goto err_udp_mib;
1654         net->mib.udplite_statistics = alloc_percpu(struct udp_mib);
1655         if (!net->mib.udplite_statistics)
1656                 goto err_udplite_mib;
1657         net->mib.icmp_statistics = alloc_percpu(struct icmp_mib);
1658         if (!net->mib.icmp_statistics)
1659                 goto err_icmp_mib;
1660         net->mib.icmpmsg_statistics = kzalloc(sizeof(struct icmpmsg_mib),
1661                                               GFP_KERNEL);
1662         if (!net->mib.icmpmsg_statistics)
1663                 goto err_icmpmsg_mib;
1664 
1665         tcp_mib_init(net);
1666         return 0;
1667 
1668 err_icmpmsg_mib:
1669         free_percpu(net->mib.icmp_statistics);
1670 err_icmp_mib:
1671         free_percpu(net->mib.udplite_statistics);
1672 err_udplite_mib:
1673         free_percpu(net->mib.udp_statistics);
1674 err_udp_mib:
1675         free_percpu(net->mib.net_statistics);
1676 err_net_mib:
1677         free_percpu(net->mib.ip_statistics);
1678 err_ip_mib:
1679         free_percpu(net->mib.tcp_statistics);
1680 err_tcp_mib:
1681         return -ENOMEM;
1682 }
1683 
1684 static __net_exit void ipv4_mib_exit_net(struct net *net)
1685 {
1686         kfree(net->mib.icmpmsg_statistics);
1687         free_percpu(net->mib.icmp_statistics);
1688         free_percpu(net->mib.udplite_statistics);
1689         free_percpu(net->mib.udp_statistics);
1690         free_percpu(net->mib.net_statistics);
1691         free_percpu(net->mib.ip_statistics);
1692         free_percpu(net->mib.tcp_statistics);
1693 }
1694 
1695 static __net_initdata struct pernet_operations ipv4_mib_ops = {
1696         .init = ipv4_mib_init_net,
1697         .exit = ipv4_mib_exit_net,
1698 };
1699 
1700 static int __init init_ipv4_mibs(void)
1701 {
1702         return register_pernet_subsys(&ipv4_mib_ops);
1703 }
1704 
1705 static __net_init int inet_init_net(struct net *net)
1706 {
1707         /*
1708          * Set defaults for local port range
1709          */
1710         seqlock_init(&net->ipv4.ip_local_ports.lock);
1711         net->ipv4.ip_local_ports.range[0] =  32768;
1712         net->ipv4.ip_local_ports.range[1] =  60999;
1713 
1714         seqlock_init(&net->ipv4.ping_group_range.lock);
1715         /*
1716          * Sane defaults - nobody may create ping sockets.
1717          * Boot scripts should set this to distro-specific group.
1718          */
1719         net->ipv4.ping_group_range.range[0] = make_kgid(&init_user_ns, 1);
1720         net->ipv4.ping_group_range.range[1] = make_kgid(&init_user_ns, 0);
1721 
1722         /* Default values for sysctl-controlled parameters.
1723          * We set them here, in case sysctl is not compiled.
1724          */
1725         net->ipv4.sysctl_ip_default_ttl = IPDEFTTL;
1726         net->ipv4.sysctl_ip_dynaddr = 0;
1727         net->ipv4.sysctl_ip_early_demux = 1;
1728         net->ipv4.sysctl_udp_early_demux = 1;
1729         net->ipv4.sysctl_tcp_early_demux = 1;
1730 #ifdef CONFIG_SYSCTL
1731         net->ipv4.sysctl_ip_prot_sock = PROT_SOCK;
1732 #endif
1733 
1734         /* Some igmp sysctl, whose values are always used */
1735         net->ipv4.sysctl_igmp_max_memberships = 20;
1736         net->ipv4.sysctl_igmp_max_msf = 10;
1737         /* IGMP reports for link-local multicast groups are enabled by default */
1738         net->ipv4.sysctl_igmp_llm_reports = 1;
1739         net->ipv4.sysctl_igmp_qrv = 2;
1740 
1741         return 0;
1742 }
1743 
1744 static __net_exit void inet_exit_net(struct net *net)
1745 {
1746 }
1747 
1748 static __net_initdata struct pernet_operations af_inet_ops = {
1749         .init = inet_init_net,
1750         .exit = inet_exit_net,
1751 };
1752 
1753 static int __init init_inet_pernet_ops(void)
1754 {
1755         return register_pernet_subsys(&af_inet_ops);
1756 }
1757 
1758 static int ipv4_proc_init(void);
1759 
1760 /*
1761  *      IP protocol layer initialiser
1762  */
1763 
1764 static struct packet_offload ip_packet_offload __read_mostly = {
1765         .type = cpu_to_be16(ETH_P_IP),
1766         .callbacks = {
1767                 .gso_segment = inet_gso_segment,
1768                 .gro_receive = inet_gro_receive,
1769                 .gro_complete = inet_gro_complete,
1770         },
1771 };
1772 
1773 static const struct net_offload ipip_offload = {
1774         .callbacks = {
1775                 .gso_segment    = inet_gso_segment,
1776                 .gro_receive    = ipip_gro_receive,
1777                 .gro_complete   = ipip_gro_complete,
1778         },
1779 };
1780 
1781 static int __init ipv4_offload_init(void)
1782 {
1783         /*
1784          * Add offloads
1785          */
1786         if (udpv4_offload_init() < 0)
1787                 pr_crit("%s: Cannot add UDP protocol offload\n", __func__);
1788         if (tcpv4_offload_init() < 0)
1789                 pr_crit("%s: Cannot add TCP protocol offload\n", __func__);
1790 
1791         dev_add_offload(&ip_packet_offload);
1792         inet_add_offload(&ipip_offload, IPPROTO_IPIP);
1793         return 0;
1794 }
1795 
1796 fs_initcall(ipv4_offload_init);
1797 
1798 static struct packet_type ip_packet_type __read_mostly = {
1799         .type = cpu_to_be16(ETH_P_IP),
1800         .func = ip_rcv,
1801 };
1802 
1803 static int __init inet_init(void)
1804 {
1805         struct inet_protosw *q;
1806         struct list_head *r;
1807         int rc = -EINVAL;
1808 
1809         sock_skb_cb_check_size(sizeof(struct inet_skb_parm));
1810 
1811         rc = proto_register(&tcp_prot, 1);
1812         if (rc)
1813                 goto out;
1814 
1815         rc = proto_register(&udp_prot, 1);
1816         if (rc)
1817                 goto out_unregister_tcp_proto;
1818 
1819         rc = proto_register(&raw_prot, 1);
1820         if (rc)
1821                 goto out_unregister_udp_proto;
1822 
1823         rc = proto_register(&ping_prot, 1);
1824         if (rc)
1825                 goto out_unregister_raw_proto;
1826 
1827         /*
1828          *      Tell SOCKET that we are alive...
1829          */
1830 
1831         (void)sock_register(&inet_family_ops);
1832 
1833 #ifdef CONFIG_SYSCTL
1834         ip_static_sysctl_init();
1835 #endif
1836 
1837         /*
1838          *      Add all the base protocols.
1839          */
1840 
1841         if (inet_add_protocol(&icmp_protocol, IPPROTO_ICMP) < 0)
1842                 pr_crit("%s: Cannot add ICMP protocol\n", __func__);
1843         if (inet_add_protocol(&udp_protocol, IPPROTO_UDP) < 0)
1844                 pr_crit("%s: Cannot add UDP protocol\n", __func__);
1845         if (inet_add_protocol(&tcp_protocol, IPPROTO_TCP) < 0)
1846                 pr_crit("%s: Cannot add TCP protocol\n", __func__);
1847 #ifdef CONFIG_IP_MULTICAST
1848         if (inet_add_protocol(&igmp_protocol, IPPROTO_IGMP) < 0)
1849                 pr_crit("%s: Cannot add IGMP protocol\n", __func__);
1850 #endif
1851 
1852         /* Register the socket-side information for inet_create. */
1853         for (r = &inetsw[0]; r < &inetsw[SOCK_MAX]; ++r)
1854                 INIT_LIST_HEAD(r);
1855 
1856         for (q = inetsw_array; q < &inetsw_array[INETSW_ARRAY_LEN]; ++q)
1857                 inet_register_protosw(q);
1858 
1859         /*
1860          *      Set the ARP module up
1861          */
1862 
1863         arp_init();
1864 
1865         /*
1866          *      Set the IP module up
1867          */
1868 
1869         ip_init();
1870 
1871         /* Setup TCP slab cache for open requests. */
1872         tcp_init();
1873 
1874         /* Setup UDP memory threshold */
1875         udp_init();
1876 
1877         /* Add UDP-Lite (RFC 3828) */
1878         udplite4_register();
1879 
1880         ping_init();
1881 
1882         /*
1883          *      Set the ICMP layer up
1884          */
1885 
1886         if (icmp_init() < 0)
1887                 panic("Failed to create the ICMP control socket.\n");
1888 
1889         /*
1890          *      Initialise the multicast router
1891          */
1892 #if defined(CONFIG_IP_MROUTE)
1893         if (ip_mr_init())
1894                 pr_crit("%s: Cannot init ipv4 mroute\n", __func__);
1895 #endif
1896 
1897         if (init_inet_pernet_ops())
1898                 pr_crit("%s: Cannot init ipv4 inet pernet ops\n", __func__);
1899         /*
1900          *      Initialise per-cpu ipv4 mibs
1901          */
1902 
1903         if (init_ipv4_mibs())
1904                 pr_crit("%s: Cannot init ipv4 mibs\n", __func__);
1905 
1906         ipv4_proc_init();
1907 
1908         ipfrag_init();
1909 
1910         dev_add_pack(&ip_packet_type);
1911 
1912         ip_tunnel_core_init();
1913 
1914         rc = 0;
1915 out:
1916         return rc;
1917 out_unregister_raw_proto:
1918         proto_unregister(&raw_prot);
1919 out_unregister_udp_proto:
1920         proto_unregister(&udp_prot);
1921 out_unregister_tcp_proto:
1922         proto_unregister(&tcp_prot);
1923         goto out;
1924 }
1925 
1926 fs_initcall(inet_init);
1927 
1928 /* ------------------------------------------------------------------------ */
1929 
1930 #ifdef CONFIG_PROC_FS
1931 static int __init ipv4_proc_init(void)
1932 {
1933         int rc = 0;
1934 
1935         if (raw_proc_init())
1936                 goto out_raw;
1937         if (tcp4_proc_init())
1938                 goto out_tcp;
1939         if (udp4_proc_init())
1940                 goto out_udp;
1941         if (ping_proc_init())
1942                 goto out_ping;
1943         if (ip_misc_proc_init())
1944                 goto out_misc;
1945 out:
1946         return rc;
1947 out_misc:
1948         ping_proc_exit();
1949 out_ping:
1950         udp4_proc_exit();
1951 out_udp:
1952         tcp4_proc_exit();
1953 out_tcp:
1954         raw_proc_exit();
1955 out_raw:
1956         rc = -ENOMEM;
1957         goto out;
1958 }
1959 
1960 #else /* CONFIG_PROC_FS */
1961 static int __init ipv4_proc_init(void)
1962 {
1963         return 0;
1964 }
1965 #endif /* CONFIG_PROC_FS */
1966 

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