~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

TOMOYO Linux Cross Reference
Linux/net/ipv4/af_inet.c

Version: ~ [ linux-4.19-rc7 ] ~ [ linux-4.18.12 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.74 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.131 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.159 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.19.8 ] ~ [ linux-3.18.123 ] ~ [ linux-3.17.8 ] ~ [ linux-3.16.59 ] ~ [ linux-3.15.10 ] ~ [ linux-3.14.79 ] ~ [ linux-3.13.11 ] ~ [ linux-3.12.74 ] ~ [ linux-3.11.10 ] ~ [ linux-3.10.108 ] ~ [ linux-3.9.11 ] ~ [ linux-3.8.13 ] ~ [ linux-3.7.10 ] ~ [ linux-3.6.11 ] ~ [ linux-3.5.7 ] ~ [ linux-3.4.113 ] ~ [ linux-3.3.8 ] ~ [ linux-3.2.102 ] ~ [ linux-3.1.10 ] ~ [ linux-3.0.101 ] ~ [ linux-2.6.39.4 ] ~ [ linux-2.6.38.8 ] ~ [ linux-2.6.37.6 ] ~ [ linux-2.6.36.4 ] ~ [ linux-2.6.35.14 ] ~ [ linux-2.6.34.15 ] ~ [ linux-2.6.33.20 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.31.14 ] ~ [ linux-2.6.30.10 ] ~ [ linux-2.6.29.6 ] ~ [ linux-2.6.28.10 ] ~ [ linux-2.6.27.62 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

  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 #include <trace/events/sock.h>
125 
126 /* The inetsw table contains everything that inet_create needs to
127  * build a new socket.
128  */
129 static struct list_head inetsw[SOCK_MAX];
130 static DEFINE_SPINLOCK(inetsw_lock);
131 
132 /* New destruction routine */
133 
134 void inet_sock_destruct(struct sock *sk)
135 {
136         struct inet_sock *inet = inet_sk(sk);
137 
138         __skb_queue_purge(&sk->sk_receive_queue);
139         __skb_queue_purge(&sk->sk_error_queue);
140 
141         sk_mem_reclaim(sk);
142 
143         if (sk->sk_type == SOCK_STREAM && sk->sk_state != TCP_CLOSE) {
144                 pr_err("Attempt to release TCP socket in state %d %p\n",
145                        sk->sk_state, sk);
146                 return;
147         }
148         if (!sock_flag(sk, SOCK_DEAD)) {
149                 pr_err("Attempt to release alive inet socket %p\n", sk);
150                 return;
151         }
152 
153         WARN_ON(atomic_read(&sk->sk_rmem_alloc));
154         WARN_ON(refcount_read(&sk->sk_wmem_alloc));
155         WARN_ON(sk->sk_wmem_queued);
156         WARN_ON(sk->sk_forward_alloc);
157 
158         kfree(rcu_dereference_protected(inet->inet_opt, 1));
159         dst_release(rcu_dereference_check(sk->sk_dst_cache, 1));
160         dst_release(sk->sk_rx_dst);
161         sk_refcnt_debug_dec(sk);
162 }
163 EXPORT_SYMBOL(inet_sock_destruct);
164 
165 /*
166  *      The routines beyond this point handle the behaviour of an AF_INET
167  *      socket object. Mostly it punts to the subprotocols of IP to do
168  *      the work.
169  */
170 
171 /*
172  *      Automatically bind an unbound socket.
173  */
174 
175 static int inet_autobind(struct sock *sk)
176 {
177         struct inet_sock *inet;
178         /* We may need to bind the socket. */
179         lock_sock(sk);
180         inet = inet_sk(sk);
181         if (!inet->inet_num) {
182                 if (sk->sk_prot->get_port(sk, 0)) {
183                         release_sock(sk);
184                         return -EAGAIN;
185                 }
186                 inet->inet_sport = htons(inet->inet_num);
187         }
188         release_sock(sk);
189         return 0;
190 }
191 
192 /*
193  *      Move a socket into listening state.
194  */
195 int inet_listen(struct socket *sock, int backlog)
196 {
197         struct sock *sk = sock->sk;
198         unsigned char old_state;
199         int err, tcp_fastopen;
200 
201         lock_sock(sk);
202 
203         err = -EINVAL;
204         if (sock->state != SS_UNCONNECTED || sock->type != SOCK_STREAM)
205                 goto out;
206 
207         old_state = sk->sk_state;
208         if (!((1 << old_state) & (TCPF_CLOSE | TCPF_LISTEN)))
209                 goto out;
210 
211         /* Really, if the socket is already in listen state
212          * we can only allow the backlog to be adjusted.
213          */
214         if (old_state != TCP_LISTEN) {
215                 /* Enable TFO w/o requiring TCP_FASTOPEN socket option.
216                  * Note that only TCP sockets (SOCK_STREAM) will reach here.
217                  * Also fastopen backlog may already been set via the option
218                  * because the socket was in TCP_LISTEN state previously but
219                  * was shutdown() rather than close().
220                  */
221                 tcp_fastopen = sock_net(sk)->ipv4.sysctl_tcp_fastopen;
222                 if ((tcp_fastopen & TFO_SERVER_WO_SOCKOPT1) &&
223                     (tcp_fastopen & TFO_SERVER_ENABLE) &&
224                     !inet_csk(sk)->icsk_accept_queue.fastopenq.max_qlen) {
225                         fastopen_queue_tune(sk, backlog);
226                         tcp_fastopen_init_key_once(sock_net(sk));
227                 }
228 
229                 err = inet_csk_listen_start(sk, backlog);
230                 if (err)
231                         goto out;
232                 tcp_call_bpf(sk, BPF_SOCK_OPS_TCP_LISTEN_CB, 0, NULL);
233         }
234         sk->sk_max_ack_backlog = backlog;
235         err = 0;
236 
237 out:
238         release_sock(sk);
239         return err;
240 }
241 EXPORT_SYMBOL(inet_listen);
242 
243 /*
244  *      Create an inet socket.
245  */
246 
247 static int inet_create(struct net *net, struct socket *sock, int protocol,
248                        int kern)
249 {
250         struct sock *sk;
251         struct inet_protosw *answer;
252         struct inet_sock *inet;
253         struct proto *answer_prot;
254         unsigned char answer_flags;
255         int try_loading_module = 0;
256         int err;
257 
258         if (protocol < 0 || protocol >= IPPROTO_MAX)
259                 return -EINVAL;
260 
261         sock->state = SS_UNCONNECTED;
262 
263         /* Look for the requested type/protocol pair. */
264 lookup_protocol:
265         err = -ESOCKTNOSUPPORT;
266         rcu_read_lock();
267         list_for_each_entry_rcu(answer, &inetsw[sock->type], list) {
268 
269                 err = 0;
270                 /* Check the non-wild match. */
271                 if (protocol == answer->protocol) {
272                         if (protocol != IPPROTO_IP)
273                                 break;
274                 } else {
275                         /* Check for the two wild cases. */
276                         if (IPPROTO_IP == protocol) {
277                                 protocol = answer->protocol;
278                                 break;
279                         }
280                         if (IPPROTO_IP == answer->protocol)
281                                 break;
282                 }
283                 err = -EPROTONOSUPPORT;
284         }
285 
286         if (unlikely(err)) {
287                 if (try_loading_module < 2) {
288                         rcu_read_unlock();
289                         /*
290                          * Be more specific, e.g. net-pf-2-proto-132-type-1
291                          * (net-pf-PF_INET-proto-IPPROTO_SCTP-type-SOCK_STREAM)
292                          */
293                         if (++try_loading_module == 1)
294                                 request_module("net-pf-%d-proto-%d-type-%d",
295                                                PF_INET, protocol, sock->type);
296                         /*
297                          * Fall back to generic, e.g. net-pf-2-proto-132
298                          * (net-pf-PF_INET-proto-IPPROTO_SCTP)
299                          */
300                         else
301                                 request_module("net-pf-%d-proto-%d",
302                                                PF_INET, protocol);
303                         goto lookup_protocol;
304                 } else
305                         goto out_rcu_unlock;
306         }
307 
308         err = -EPERM;
309         if (sock->type == SOCK_RAW && !kern &&
310             !ns_capable(net->user_ns, CAP_NET_RAW))
311                 goto out_rcu_unlock;
312 
313         sock->ops = answer->ops;
314         answer_prot = answer->prot;
315         answer_flags = answer->flags;
316         rcu_read_unlock();
317 
318         WARN_ON(!answer_prot->slab);
319 
320         err = -ENOBUFS;
321         sk = sk_alloc(net, PF_INET, GFP_KERNEL, answer_prot, kern);
322         if (!sk)
323                 goto out;
324 
325         err = 0;
326         if (INET_PROTOSW_REUSE & answer_flags)
327                 sk->sk_reuse = SK_CAN_REUSE;
328 
329         inet = inet_sk(sk);
330         inet->is_icsk = (INET_PROTOSW_ICSK & answer_flags) != 0;
331 
332         inet->nodefrag = 0;
333 
334         if (SOCK_RAW == sock->type) {
335                 inet->inet_num = protocol;
336                 if (IPPROTO_RAW == protocol)
337                         inet->hdrincl = 1;
338         }
339 
340         if (net->ipv4.sysctl_ip_no_pmtu_disc)
341                 inet->pmtudisc = IP_PMTUDISC_DONT;
342         else
343                 inet->pmtudisc = IP_PMTUDISC_WANT;
344 
345         inet->inet_id = 0;
346 
347         sock_init_data(sock, sk);
348 
349         sk->sk_destruct    = inet_sock_destruct;
350         sk->sk_protocol    = protocol;
351         sk->sk_backlog_rcv = sk->sk_prot->backlog_rcv;
352 
353         inet->uc_ttl    = -1;
354         inet->mc_loop   = 1;
355         inet->mc_ttl    = 1;
356         inet->mc_all    = 1;
357         inet->mc_index  = 0;
358         inet->mc_list   = NULL;
359         inet->rcv_tos   = 0;
360 
361         sk_refcnt_debug_inc(sk);
362 
363         if (inet->inet_num) {
364                 /* It assumes that any protocol which allows
365                  * the user to assign a number at socket
366                  * creation time automatically
367                  * shares.
368                  */
369                 inet->inet_sport = htons(inet->inet_num);
370                 /* Add to protocol hash chains. */
371                 err = sk->sk_prot->hash(sk);
372                 if (err) {
373                         sk_common_release(sk);
374                         goto out;
375                 }
376         }
377 
378         if (sk->sk_prot->init) {
379                 err = sk->sk_prot->init(sk);
380                 if (err) {
381                         sk_common_release(sk);
382                         goto out;
383                 }
384         }
385 
386         if (!kern) {
387                 err = BPF_CGROUP_RUN_PROG_INET_SOCK(sk);
388                 if (err) {
389                         sk_common_release(sk);
390                         goto out;
391                 }
392         }
393 out:
394         return err;
395 out_rcu_unlock:
396         rcu_read_unlock();
397         goto out;
398 }
399 
400 
401 /*
402  *      The peer socket should always be NULL (or else). When we call this
403  *      function we are destroying the object and from then on nobody
404  *      should refer to it.
405  */
406 int inet_release(struct socket *sock)
407 {
408         struct sock *sk = sock->sk;
409 
410         if (sk) {
411                 long timeout;
412 
413                 /* Applications forget to leave groups before exiting */
414                 ip_mc_drop_socket(sk);
415 
416                 /* If linger is set, we don't return until the close
417                  * is complete.  Otherwise we return immediately. The
418                  * actually closing is done the same either way.
419                  *
420                  * If the close is due to the process exiting, we never
421                  * linger..
422                  */
423                 timeout = 0;
424                 if (sock_flag(sk, SOCK_LINGER) &&
425                     !(current->flags & PF_EXITING))
426                         timeout = sk->sk_lingertime;
427                 sock->sk = NULL;
428                 sk->sk_prot->close(sk, timeout);
429         }
430         return 0;
431 }
432 EXPORT_SYMBOL(inet_release);
433 
434 int inet_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
435 {
436         struct sock *sk = sock->sk;
437         int err;
438 
439         /* If the socket has its own bind function then use it. (RAW) */
440         if (sk->sk_prot->bind) {
441                 return sk->sk_prot->bind(sk, uaddr, addr_len);
442         }
443         if (addr_len < sizeof(struct sockaddr_in))
444                 return -EINVAL;
445 
446         /* BPF prog is run before any checks are done so that if the prog
447          * changes context in a wrong way it will be caught.
448          */
449         err = BPF_CGROUP_RUN_PROG_INET4_BIND(sk, uaddr);
450         if (err)
451                 return err;
452 
453         return __inet_bind(sk, uaddr, addr_len, false, true);
454 }
455 EXPORT_SYMBOL(inet_bind);
456 
457 int __inet_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len,
458                 bool force_bind_address_no_port, bool with_lock)
459 {
460         struct sockaddr_in *addr = (struct sockaddr_in *)uaddr;
461         struct inet_sock *inet = inet_sk(sk);
462         struct net *net = sock_net(sk);
463         unsigned short snum;
464         int chk_addr_ret;
465         u32 tb_id = RT_TABLE_LOCAL;
466         int err;
467 
468         if (addr->sin_family != AF_INET) {
469                 /* Compatibility games : accept AF_UNSPEC (mapped to AF_INET)
470                  * only if s_addr is INADDR_ANY.
471                  */
472                 err = -EAFNOSUPPORT;
473                 if (addr->sin_family != AF_UNSPEC ||
474                     addr->sin_addr.s_addr != htonl(INADDR_ANY))
475                         goto out;
476         }
477 
478         tb_id = l3mdev_fib_table_by_index(net, sk->sk_bound_dev_if) ? : tb_id;
479         chk_addr_ret = inet_addr_type_table(net, addr->sin_addr.s_addr, tb_id);
480 
481         /* Not specified by any standard per-se, however it breaks too
482          * many applications when removed.  It is unfortunate since
483          * allowing applications to make a non-local bind solves
484          * several problems with systems using dynamic addressing.
485          * (ie. your servers still start up even if your ISDN link
486          *  is temporarily down)
487          */
488         err = -EADDRNOTAVAIL;
489         if (!inet_can_nonlocal_bind(net, inet) &&
490             addr->sin_addr.s_addr != htonl(INADDR_ANY) &&
491             chk_addr_ret != RTN_LOCAL &&
492             chk_addr_ret != RTN_MULTICAST &&
493             chk_addr_ret != RTN_BROADCAST)
494                 goto out;
495 
496         snum = ntohs(addr->sin_port);
497         err = -EACCES;
498         if (snum && snum < inet_prot_sock(net) &&
499             !ns_capable(net->user_ns, CAP_NET_BIND_SERVICE))
500                 goto out;
501 
502         /*      We keep a pair of addresses. rcv_saddr is the one
503          *      used by hash lookups, and saddr is used for transmit.
504          *
505          *      In the BSD API these are the same except where it
506          *      would be illegal to use them (multicast/broadcast) in
507          *      which case the sending device address is used.
508          */
509         if (with_lock)
510                 lock_sock(sk);
511 
512         /* Check these errors (active socket, double bind). */
513         err = -EINVAL;
514         if (sk->sk_state != TCP_CLOSE || inet->inet_num)
515                 goto out_release_sock;
516 
517         inet->inet_rcv_saddr = inet->inet_saddr = addr->sin_addr.s_addr;
518         if (chk_addr_ret == RTN_MULTICAST || chk_addr_ret == RTN_BROADCAST)
519                 inet->inet_saddr = 0;  /* Use device */
520 
521         /* Make sure we are allowed to bind here. */
522         if (snum || !(inet->bind_address_no_port ||
523                       force_bind_address_no_port)) {
524                 if (sk->sk_prot->get_port(sk, snum)) {
525                         inet->inet_saddr = inet->inet_rcv_saddr = 0;
526                         err = -EADDRINUSE;
527                         goto out_release_sock;
528                 }
529                 err = BPF_CGROUP_RUN_PROG_INET4_POST_BIND(sk);
530                 if (err) {
531                         inet->inet_saddr = inet->inet_rcv_saddr = 0;
532                         goto out_release_sock;
533                 }
534         }
535 
536         if (inet->inet_rcv_saddr)
537                 sk->sk_userlocks |= SOCK_BINDADDR_LOCK;
538         if (snum)
539                 sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
540         inet->inet_sport = htons(inet->inet_num);
541         inet->inet_daddr = 0;
542         inet->inet_dport = 0;
543         sk_dst_reset(sk);
544         err = 0;
545 out_release_sock:
546         if (with_lock)
547                 release_sock(sk);
548 out:
549         return err;
550 }
551 
552 int inet_dgram_connect(struct socket *sock, struct sockaddr *uaddr,
553                        int addr_len, int flags)
554 {
555         struct sock *sk = sock->sk;
556         int err;
557 
558         if (addr_len < sizeof(uaddr->sa_family))
559                 return -EINVAL;
560         if (uaddr->sa_family == AF_UNSPEC)
561                 return sk->sk_prot->disconnect(sk, flags);
562 
563         if (BPF_CGROUP_PRE_CONNECT_ENABLED(sk)) {
564                 err = sk->sk_prot->pre_connect(sk, uaddr, addr_len);
565                 if (err)
566                         return err;
567         }
568 
569         if (!inet_sk(sk)->inet_num && inet_autobind(sk))
570                 return -EAGAIN;
571         return sk->sk_prot->connect(sk, uaddr, addr_len);
572 }
573 EXPORT_SYMBOL(inet_dgram_connect);
574 
575 static long inet_wait_for_connect(struct sock *sk, long timeo, int writebias)
576 {
577         DEFINE_WAIT_FUNC(wait, woken_wake_function);
578 
579         add_wait_queue(sk_sleep(sk), &wait);
580         sk->sk_write_pending += writebias;
581 
582         /* Basic assumption: if someone sets sk->sk_err, he _must_
583          * change state of the socket from TCP_SYN_*.
584          * Connect() does not allow to get error notifications
585          * without closing the socket.
586          */
587         while ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV)) {
588                 release_sock(sk);
589                 timeo = wait_woken(&wait, TASK_INTERRUPTIBLE, timeo);
590                 lock_sock(sk);
591                 if (signal_pending(current) || !timeo)
592                         break;
593         }
594         remove_wait_queue(sk_sleep(sk), &wait);
595         sk->sk_write_pending -= writebias;
596         return timeo;
597 }
598 
599 /*
600  *      Connect to a remote host. There is regrettably still a little
601  *      TCP 'magic' in here.
602  */
603 int __inet_stream_connect(struct socket *sock, struct sockaddr *uaddr,
604                           int addr_len, int flags, int is_sendmsg)
605 {
606         struct sock *sk = sock->sk;
607         int err;
608         long timeo;
609 
610         /*
611          * uaddr can be NULL and addr_len can be 0 if:
612          * sk is a TCP fastopen active socket and
613          * TCP_FASTOPEN_CONNECT sockopt is set and
614          * we already have a valid cookie for this socket.
615          * In this case, user can call write() after connect().
616          * write() will invoke tcp_sendmsg_fastopen() which calls
617          * __inet_stream_connect().
618          */
619         if (uaddr) {
620                 if (addr_len < sizeof(uaddr->sa_family))
621                         return -EINVAL;
622 
623                 if (uaddr->sa_family == AF_UNSPEC) {
624                         err = sk->sk_prot->disconnect(sk, flags);
625                         sock->state = err ? SS_DISCONNECTING : SS_UNCONNECTED;
626                         goto out;
627                 }
628         }
629 
630         switch (sock->state) {
631         default:
632                 err = -EINVAL;
633                 goto out;
634         case SS_CONNECTED:
635                 err = -EISCONN;
636                 goto out;
637         case SS_CONNECTING:
638                 if (inet_sk(sk)->defer_connect)
639                         err = is_sendmsg ? -EINPROGRESS : -EISCONN;
640                 else
641                         err = -EALREADY;
642                 /* Fall out of switch with err, set for this state */
643                 break;
644         case SS_UNCONNECTED:
645                 err = -EISCONN;
646                 if (sk->sk_state != TCP_CLOSE)
647                         goto out;
648 
649                 if (BPF_CGROUP_PRE_CONNECT_ENABLED(sk)) {
650                         err = sk->sk_prot->pre_connect(sk, uaddr, addr_len);
651                         if (err)
652                                 goto out;
653                 }
654 
655                 err = sk->sk_prot->connect(sk, uaddr, addr_len);
656                 if (err < 0)
657                         goto out;
658 
659                 sock->state = SS_CONNECTING;
660 
661                 if (!err && inet_sk(sk)->defer_connect)
662                         goto out;
663 
664                 /* Just entered SS_CONNECTING state; the only
665                  * difference is that return value in non-blocking
666                  * case is EINPROGRESS, rather than EALREADY.
667                  */
668                 err = -EINPROGRESS;
669                 break;
670         }
671 
672         timeo = sock_sndtimeo(sk, flags & O_NONBLOCK);
673 
674         if ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV)) {
675                 int writebias = (sk->sk_protocol == IPPROTO_TCP) &&
676                                 tcp_sk(sk)->fastopen_req &&
677                                 tcp_sk(sk)->fastopen_req->data ? 1 : 0;
678 
679                 /* Error code is set above */
680                 if (!timeo || !inet_wait_for_connect(sk, timeo, writebias))
681                         goto out;
682 
683                 err = sock_intr_errno(timeo);
684                 if (signal_pending(current))
685                         goto out;
686         }
687 
688         /* Connection was closed by RST, timeout, ICMP error
689          * or another process disconnected us.
690          */
691         if (sk->sk_state == TCP_CLOSE)
692                 goto sock_error;
693 
694         /* sk->sk_err may be not zero now, if RECVERR was ordered by user
695          * and error was received after socket entered established state.
696          * Hence, it is handled normally after connect() return successfully.
697          */
698 
699         sock->state = SS_CONNECTED;
700         err = 0;
701 out:
702         return err;
703 
704 sock_error:
705         err = sock_error(sk) ? : -ECONNABORTED;
706         sock->state = SS_UNCONNECTED;
707         if (sk->sk_prot->disconnect(sk, flags))
708                 sock->state = SS_DISCONNECTING;
709         goto out;
710 }
711 EXPORT_SYMBOL(__inet_stream_connect);
712 
713 int inet_stream_connect(struct socket *sock, struct sockaddr *uaddr,
714                         int addr_len, int flags)
715 {
716         int err;
717 
718         lock_sock(sock->sk);
719         err = __inet_stream_connect(sock, uaddr, addr_len, flags, 0);
720         release_sock(sock->sk);
721         return err;
722 }
723 EXPORT_SYMBOL(inet_stream_connect);
724 
725 /*
726  *      Accept a pending connection. The TCP layer now gives BSD semantics.
727  */
728 
729 int inet_accept(struct socket *sock, struct socket *newsock, int flags,
730                 bool kern)
731 {
732         struct sock *sk1 = sock->sk;
733         int err = -EINVAL;
734         struct sock *sk2 = sk1->sk_prot->accept(sk1, flags, &err, kern);
735 
736         if (!sk2)
737                 goto do_err;
738 
739         lock_sock(sk2);
740 
741         sock_rps_record_flow(sk2);
742         WARN_ON(!((1 << sk2->sk_state) &
743                   (TCPF_ESTABLISHED | TCPF_SYN_RECV |
744                   TCPF_CLOSE_WAIT | TCPF_CLOSE)));
745 
746         sock_graft(sk2, newsock);
747 
748         newsock->state = SS_CONNECTED;
749         err = 0;
750         release_sock(sk2);
751 do_err:
752         return err;
753 }
754 EXPORT_SYMBOL(inet_accept);
755 
756 
757 /*
758  *      This does both peername and sockname.
759  */
760 int inet_getname(struct socket *sock, struct sockaddr *uaddr,
761                         int peer)
762 {
763         struct sock *sk         = sock->sk;
764         struct inet_sock *inet  = inet_sk(sk);
765         DECLARE_SOCKADDR(struct sockaddr_in *, sin, uaddr);
766 
767         sin->sin_family = AF_INET;
768         if (peer) {
769                 if (!inet->inet_dport ||
770                     (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) &&
771                      peer == 1))
772                         return -ENOTCONN;
773                 sin->sin_port = inet->inet_dport;
774                 sin->sin_addr.s_addr = inet->inet_daddr;
775         } else {
776                 __be32 addr = inet->inet_rcv_saddr;
777                 if (!addr)
778                         addr = inet->inet_saddr;
779                 sin->sin_port = inet->inet_sport;
780                 sin->sin_addr.s_addr = addr;
781         }
782         memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
783         return sizeof(*sin);
784 }
785 EXPORT_SYMBOL(inet_getname);
786 
787 int inet_sendmsg(struct socket *sock, struct msghdr *msg, size_t size)
788 {
789         struct sock *sk = sock->sk;
790 
791         sock_rps_record_flow(sk);
792 
793         /* We may need to bind the socket. */
794         if (!inet_sk(sk)->inet_num && !sk->sk_prot->no_autobind &&
795             inet_autobind(sk))
796                 return -EAGAIN;
797 
798         return sk->sk_prot->sendmsg(sk, msg, size);
799 }
800 EXPORT_SYMBOL(inet_sendmsg);
801 
802 ssize_t inet_sendpage(struct socket *sock, struct page *page, int offset,
803                       size_t size, int flags)
804 {
805         struct sock *sk = sock->sk;
806 
807         sock_rps_record_flow(sk);
808 
809         /* We may need to bind the socket. */
810         if (!inet_sk(sk)->inet_num && !sk->sk_prot->no_autobind &&
811             inet_autobind(sk))
812                 return -EAGAIN;
813 
814         if (sk->sk_prot->sendpage)
815                 return sk->sk_prot->sendpage(sk, page, offset, size, flags);
816         return sock_no_sendpage(sock, page, offset, size, flags);
817 }
818 EXPORT_SYMBOL(inet_sendpage);
819 
820 int inet_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
821                  int flags)
822 {
823         struct sock *sk = sock->sk;
824         int addr_len = 0;
825         int err;
826 
827         if (likely(!(flags & MSG_ERRQUEUE)))
828                 sock_rps_record_flow(sk);
829 
830         err = sk->sk_prot->recvmsg(sk, msg, size, flags & MSG_DONTWAIT,
831                                    flags & ~MSG_DONTWAIT, &addr_len);
832         if (err >= 0)
833                 msg->msg_namelen = addr_len;
834         return err;
835 }
836 EXPORT_SYMBOL(inet_recvmsg);
837 
838 int inet_shutdown(struct socket *sock, int how)
839 {
840         struct sock *sk = sock->sk;
841         int err = 0;
842 
843         /* This should really check to make sure
844          * the socket is a TCP socket. (WHY AC...)
845          */
846         how++; /* maps 0->1 has the advantage of making bit 1 rcvs and
847                        1->2 bit 2 snds.
848                        2->3 */
849         if ((how & ~SHUTDOWN_MASK) || !how)     /* MAXINT->0 */
850                 return -EINVAL;
851 
852         lock_sock(sk);
853         if (sock->state == SS_CONNECTING) {
854                 if ((1 << sk->sk_state) &
855                     (TCPF_SYN_SENT | TCPF_SYN_RECV | TCPF_CLOSE))
856                         sock->state = SS_DISCONNECTING;
857                 else
858                         sock->state = SS_CONNECTED;
859         }
860 
861         switch (sk->sk_state) {
862         case TCP_CLOSE:
863                 err = -ENOTCONN;
864                 /* Hack to wake up other listeners, who can poll for
865                    EPOLLHUP, even on eg. unconnected UDP sockets -- RR */
866                 /* fall through */
867         default:
868                 sk->sk_shutdown |= how;
869                 if (sk->sk_prot->shutdown)
870                         sk->sk_prot->shutdown(sk, how);
871                 break;
872 
873         /* Remaining two branches are temporary solution for missing
874          * close() in multithreaded environment. It is _not_ a good idea,
875          * but we have no choice until close() is repaired at VFS level.
876          */
877         case TCP_LISTEN:
878                 if (!(how & RCV_SHUTDOWN))
879                         break;
880                 /* fall through */
881         case TCP_SYN_SENT:
882                 err = sk->sk_prot->disconnect(sk, O_NONBLOCK);
883                 sock->state = err ? SS_DISCONNECTING : SS_UNCONNECTED;
884                 break;
885         }
886 
887         /* Wake up anyone sleeping in poll. */
888         sk->sk_state_change(sk);
889         release_sock(sk);
890         return err;
891 }
892 EXPORT_SYMBOL(inet_shutdown);
893 
894 /*
895  *      ioctl() calls you can issue on an INET socket. Most of these are
896  *      device configuration and stuff and very rarely used. Some ioctls
897  *      pass on to the socket itself.
898  *
899  *      NOTE: I like the idea of a module for the config stuff. ie ifconfig
900  *      loads the devconfigure module does its configuring and unloads it.
901  *      There's a good 20K of config code hanging around the kernel.
902  */
903 
904 int inet_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
905 {
906         struct sock *sk = sock->sk;
907         int err = 0;
908         struct net *net = sock_net(sk);
909         void __user *p = (void __user *)arg;
910         struct ifreq ifr;
911         struct rtentry rt;
912 
913         switch (cmd) {
914         case SIOCGSTAMP:
915                 err = sock_get_timestamp(sk, (struct timeval __user *)arg);
916                 break;
917         case SIOCGSTAMPNS:
918                 err = sock_get_timestampns(sk, (struct timespec __user *)arg);
919                 break;
920         case SIOCADDRT:
921         case SIOCDELRT:
922                 if (copy_from_user(&rt, p, sizeof(struct rtentry)))
923                         return -EFAULT;
924                 err = ip_rt_ioctl(net, cmd, &rt);
925                 break;
926         case SIOCRTMSG:
927                 err = -EINVAL;
928                 break;
929         case SIOCDARP:
930         case SIOCGARP:
931         case SIOCSARP:
932                 err = arp_ioctl(net, cmd, (void __user *)arg);
933                 break;
934         case SIOCGIFADDR:
935         case SIOCGIFBRDADDR:
936         case SIOCGIFNETMASK:
937         case SIOCGIFDSTADDR:
938         case SIOCGIFPFLAGS:
939                 if (copy_from_user(&ifr, p, sizeof(struct ifreq)))
940                         return -EFAULT;
941                 err = devinet_ioctl(net, cmd, &ifr);
942                 if (!err && copy_to_user(p, &ifr, sizeof(struct ifreq)))
943                         err = -EFAULT;
944                 break;
945 
946         case SIOCSIFADDR:
947         case SIOCSIFBRDADDR:
948         case SIOCSIFNETMASK:
949         case SIOCSIFDSTADDR:
950         case SIOCSIFPFLAGS:
951         case SIOCSIFFLAGS:
952                 if (copy_from_user(&ifr, p, sizeof(struct ifreq)))
953                         return -EFAULT;
954                 err = devinet_ioctl(net, cmd, &ifr);
955                 break;
956         default:
957                 if (sk->sk_prot->ioctl)
958                         err = sk->sk_prot->ioctl(sk, cmd, arg);
959                 else
960                         err = -ENOIOCTLCMD;
961                 break;
962         }
963         return err;
964 }
965 EXPORT_SYMBOL(inet_ioctl);
966 
967 #ifdef CONFIG_COMPAT
968 static int inet_compat_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
969 {
970         struct sock *sk = sock->sk;
971         int err = -ENOIOCTLCMD;
972 
973         if (sk->sk_prot->compat_ioctl)
974                 err = sk->sk_prot->compat_ioctl(sk, cmd, arg);
975 
976         return err;
977 }
978 #endif
979 
980 const struct proto_ops inet_stream_ops = {
981         .family            = PF_INET,
982         .owner             = THIS_MODULE,
983         .release           = inet_release,
984         .bind              = inet_bind,
985         .connect           = inet_stream_connect,
986         .socketpair        = sock_no_socketpair,
987         .accept            = inet_accept,
988         .getname           = inet_getname,
989         .poll              = tcp_poll,
990         .ioctl             = inet_ioctl,
991         .listen            = inet_listen,
992         .shutdown          = inet_shutdown,
993         .setsockopt        = sock_common_setsockopt,
994         .getsockopt        = sock_common_getsockopt,
995         .sendmsg           = inet_sendmsg,
996         .recvmsg           = inet_recvmsg,
997 #ifdef CONFIG_MMU
998         .mmap              = tcp_mmap,
999 #endif
1000         .sendpage          = inet_sendpage,
1001         .splice_read       = tcp_splice_read,
1002         .read_sock         = tcp_read_sock,
1003         .sendmsg_locked    = tcp_sendmsg_locked,
1004         .sendpage_locked   = tcp_sendpage_locked,
1005         .peek_len          = tcp_peek_len,
1006 #ifdef CONFIG_COMPAT
1007         .compat_setsockopt = compat_sock_common_setsockopt,
1008         .compat_getsockopt = compat_sock_common_getsockopt,
1009         .compat_ioctl      = inet_compat_ioctl,
1010 #endif
1011         .set_rcvlowat      = tcp_set_rcvlowat,
1012 };
1013 EXPORT_SYMBOL(inet_stream_ops);
1014 
1015 const struct proto_ops inet_dgram_ops = {
1016         .family            = PF_INET,
1017         .owner             = THIS_MODULE,
1018         .release           = inet_release,
1019         .bind              = inet_bind,
1020         .connect           = inet_dgram_connect,
1021         .socketpair        = sock_no_socketpair,
1022         .accept            = sock_no_accept,
1023         .getname           = inet_getname,
1024         .poll              = udp_poll,
1025         .ioctl             = inet_ioctl,
1026         .listen            = sock_no_listen,
1027         .shutdown          = inet_shutdown,
1028         .setsockopt        = sock_common_setsockopt,
1029         .getsockopt        = sock_common_getsockopt,
1030         .sendmsg           = inet_sendmsg,
1031         .recvmsg           = inet_recvmsg,
1032         .mmap              = sock_no_mmap,
1033         .sendpage          = inet_sendpage,
1034         .set_peek_off      = sk_set_peek_off,
1035 #ifdef CONFIG_COMPAT
1036         .compat_setsockopt = compat_sock_common_setsockopt,
1037         .compat_getsockopt = compat_sock_common_getsockopt,
1038         .compat_ioctl      = inet_compat_ioctl,
1039 #endif
1040 };
1041 EXPORT_SYMBOL(inet_dgram_ops);
1042 
1043 /*
1044  * For SOCK_RAW sockets; should be the same as inet_dgram_ops but without
1045  * udp_poll
1046  */
1047 static const struct proto_ops inet_sockraw_ops = {
1048         .family            = PF_INET,
1049         .owner             = THIS_MODULE,
1050         .release           = inet_release,
1051         .bind              = inet_bind,
1052         .connect           = inet_dgram_connect,
1053         .socketpair        = sock_no_socketpair,
1054         .accept            = sock_no_accept,
1055         .getname           = inet_getname,
1056         .poll              = datagram_poll,
1057         .ioctl             = inet_ioctl,
1058         .listen            = sock_no_listen,
1059         .shutdown          = inet_shutdown,
1060         .setsockopt        = sock_common_setsockopt,
1061         .getsockopt        = sock_common_getsockopt,
1062         .sendmsg           = inet_sendmsg,
1063         .recvmsg           = inet_recvmsg,
1064         .mmap              = sock_no_mmap,
1065         .sendpage          = inet_sendpage,
1066 #ifdef CONFIG_COMPAT
1067         .compat_setsockopt = compat_sock_common_setsockopt,
1068         .compat_getsockopt = compat_sock_common_getsockopt,
1069         .compat_ioctl      = inet_compat_ioctl,
1070 #endif
1071 };
1072 
1073 static const struct net_proto_family inet_family_ops = {
1074         .family = PF_INET,
1075         .create = inet_create,
1076         .owner  = THIS_MODULE,
1077 };
1078 
1079 /* Upon startup we insert all the elements in inetsw_array[] into
1080  * the linked list inetsw.
1081  */
1082 static struct inet_protosw inetsw_array[] =
1083 {
1084         {
1085                 .type =       SOCK_STREAM,
1086                 .protocol =   IPPROTO_TCP,
1087                 .prot =       &tcp_prot,
1088                 .ops =        &inet_stream_ops,
1089                 .flags =      INET_PROTOSW_PERMANENT |
1090                               INET_PROTOSW_ICSK,
1091         },
1092 
1093         {
1094                 .type =       SOCK_DGRAM,
1095                 .protocol =   IPPROTO_UDP,
1096                 .prot =       &udp_prot,
1097                 .ops =        &inet_dgram_ops,
1098                 .flags =      INET_PROTOSW_PERMANENT,
1099        },
1100 
1101        {
1102                 .type =       SOCK_DGRAM,
1103                 .protocol =   IPPROTO_ICMP,
1104                 .prot =       &ping_prot,
1105                 .ops =        &inet_sockraw_ops,
1106                 .flags =      INET_PROTOSW_REUSE,
1107        },
1108 
1109        {
1110                .type =       SOCK_RAW,
1111                .protocol =   IPPROTO_IP,        /* wild card */
1112                .prot =       &raw_prot,
1113                .ops =        &inet_sockraw_ops,
1114                .flags =      INET_PROTOSW_REUSE,
1115        }
1116 };
1117 
1118 #define INETSW_ARRAY_LEN ARRAY_SIZE(inetsw_array)
1119 
1120 void inet_register_protosw(struct inet_protosw *p)
1121 {
1122         struct list_head *lh;
1123         struct inet_protosw *answer;
1124         int protocol = p->protocol;
1125         struct list_head *last_perm;
1126 
1127         spin_lock_bh(&inetsw_lock);
1128 
1129         if (p->type >= SOCK_MAX)
1130                 goto out_illegal;
1131 
1132         /* If we are trying to override a permanent protocol, bail. */
1133         last_perm = &inetsw[p->type];
1134         list_for_each(lh, &inetsw[p->type]) {
1135                 answer = list_entry(lh, struct inet_protosw, list);
1136                 /* Check only the non-wild match. */
1137                 if ((INET_PROTOSW_PERMANENT & answer->flags) == 0)
1138                         break;
1139                 if (protocol == answer->protocol)
1140                         goto out_permanent;
1141                 last_perm = lh;
1142         }
1143 
1144         /* Add the new entry after the last permanent entry if any, so that
1145          * the new entry does not override a permanent entry when matched with
1146          * a wild-card protocol. But it is allowed to override any existing
1147          * non-permanent entry.  This means that when we remove this entry, the
1148          * system automatically returns to the old behavior.
1149          */
1150         list_add_rcu(&p->list, last_perm);
1151 out:
1152         spin_unlock_bh(&inetsw_lock);
1153 
1154         return;
1155 
1156 out_permanent:
1157         pr_err("Attempt to override permanent protocol %d\n", protocol);
1158         goto out;
1159 
1160 out_illegal:
1161         pr_err("Ignoring attempt to register invalid socket type %d\n",
1162                p->type);
1163         goto out;
1164 }
1165 EXPORT_SYMBOL(inet_register_protosw);
1166 
1167 void inet_unregister_protosw(struct inet_protosw *p)
1168 {
1169         if (INET_PROTOSW_PERMANENT & p->flags) {
1170                 pr_err("Attempt to unregister permanent protocol %d\n",
1171                        p->protocol);
1172         } else {
1173                 spin_lock_bh(&inetsw_lock);
1174                 list_del_rcu(&p->list);
1175                 spin_unlock_bh(&inetsw_lock);
1176 
1177                 synchronize_net();
1178         }
1179 }
1180 EXPORT_SYMBOL(inet_unregister_protosw);
1181 
1182 static int inet_sk_reselect_saddr(struct sock *sk)
1183 {
1184         struct inet_sock *inet = inet_sk(sk);
1185         __be32 old_saddr = inet->inet_saddr;
1186         __be32 daddr = inet->inet_daddr;
1187         struct flowi4 *fl4;
1188         struct rtable *rt;
1189         __be32 new_saddr;
1190         struct ip_options_rcu *inet_opt;
1191 
1192         inet_opt = rcu_dereference_protected(inet->inet_opt,
1193                                              lockdep_sock_is_held(sk));
1194         if (inet_opt && inet_opt->opt.srr)
1195                 daddr = inet_opt->opt.faddr;
1196 
1197         /* Query new route. */
1198         fl4 = &inet->cork.fl.u.ip4;
1199         rt = ip_route_connect(fl4, daddr, 0, RT_CONN_FLAGS(sk),
1200                               sk->sk_bound_dev_if, sk->sk_protocol,
1201                               inet->inet_sport, inet->inet_dport, sk);
1202         if (IS_ERR(rt))
1203                 return PTR_ERR(rt);
1204 
1205         sk_setup_caps(sk, &rt->dst);
1206 
1207         new_saddr = fl4->saddr;
1208 
1209         if (new_saddr == old_saddr)
1210                 return 0;
1211 
1212         if (sock_net(sk)->ipv4.sysctl_ip_dynaddr > 1) {
1213                 pr_info("%s(): shifting inet->saddr from %pI4 to %pI4\n",
1214                         __func__, &old_saddr, &new_saddr);
1215         }
1216 
1217         inet->inet_saddr = inet->inet_rcv_saddr = new_saddr;
1218 
1219         /*
1220          * XXX The only one ugly spot where we need to
1221          * XXX really change the sockets identity after
1222          * XXX it has entered the hashes. -DaveM
1223          *
1224          * Besides that, it does not check for connection
1225          * uniqueness. Wait for troubles.
1226          */
1227         return __sk_prot_rehash(sk);
1228 }
1229 
1230 int inet_sk_rebuild_header(struct sock *sk)
1231 {
1232         struct inet_sock *inet = inet_sk(sk);
1233         struct rtable *rt = (struct rtable *)__sk_dst_check(sk, 0);
1234         __be32 daddr;
1235         struct ip_options_rcu *inet_opt;
1236         struct flowi4 *fl4;
1237         int err;
1238 
1239         /* Route is OK, nothing to do. */
1240         if (rt)
1241                 return 0;
1242 
1243         /* Reroute. */
1244         rcu_read_lock();
1245         inet_opt = rcu_dereference(inet->inet_opt);
1246         daddr = inet->inet_daddr;
1247         if (inet_opt && inet_opt->opt.srr)
1248                 daddr = inet_opt->opt.faddr;
1249         rcu_read_unlock();
1250         fl4 = &inet->cork.fl.u.ip4;
1251         rt = ip_route_output_ports(sock_net(sk), fl4, sk, daddr, inet->inet_saddr,
1252                                    inet->inet_dport, inet->inet_sport,
1253                                    sk->sk_protocol, RT_CONN_FLAGS(sk),
1254                                    sk->sk_bound_dev_if);
1255         if (!IS_ERR(rt)) {
1256                 err = 0;
1257                 sk_setup_caps(sk, &rt->dst);
1258         } else {
1259                 err = PTR_ERR(rt);
1260 
1261                 /* Routing failed... */
1262                 sk->sk_route_caps = 0;
1263                 /*
1264                  * Other protocols have to map its equivalent state to TCP_SYN_SENT.
1265                  * DCCP maps its DCCP_REQUESTING state to TCP_SYN_SENT. -acme
1266                  */
1267                 if (!sock_net(sk)->ipv4.sysctl_ip_dynaddr ||
1268                     sk->sk_state != TCP_SYN_SENT ||
1269                     (sk->sk_userlocks & SOCK_BINDADDR_LOCK) ||
1270                     (err = inet_sk_reselect_saddr(sk)) != 0)
1271                         sk->sk_err_soft = -err;
1272         }
1273 
1274         return err;
1275 }
1276 EXPORT_SYMBOL(inet_sk_rebuild_header);
1277 
1278 void inet_sk_set_state(struct sock *sk, int state)
1279 {
1280         trace_inet_sock_set_state(sk, sk->sk_state, state);
1281         sk->sk_state = state;
1282 }
1283 EXPORT_SYMBOL(inet_sk_set_state);
1284 
1285 void inet_sk_state_store(struct sock *sk, int newstate)
1286 {
1287         trace_inet_sock_set_state(sk, sk->sk_state, newstate);
1288         smp_store_release(&sk->sk_state, newstate);
1289 }
1290 
1291 struct sk_buff *inet_gso_segment(struct sk_buff *skb,
1292                                  netdev_features_t features)
1293 {
1294         bool udpfrag = false, fixedid = false, gso_partial, encap;
1295         struct sk_buff *segs = ERR_PTR(-EINVAL);
1296         const struct net_offload *ops;
1297         unsigned int offset = 0;
1298         struct iphdr *iph;
1299         int proto, tot_len;
1300         int nhoff;
1301         int ihl;
1302         int id;
1303 
1304         skb_reset_network_header(skb);
1305         nhoff = skb_network_header(skb) - skb_mac_header(skb);
1306         if (unlikely(!pskb_may_pull(skb, sizeof(*iph))))
1307                 goto out;
1308 
1309         iph = ip_hdr(skb);
1310         ihl = iph->ihl * 4;
1311         if (ihl < sizeof(*iph))
1312                 goto out;
1313 
1314         id = ntohs(iph->id);
1315         proto = iph->protocol;
1316 
1317         /* Warning: after this point, iph might be no longer valid */
1318         if (unlikely(!pskb_may_pull(skb, ihl)))
1319                 goto out;
1320         __skb_pull(skb, ihl);
1321 
1322         encap = SKB_GSO_CB(skb)->encap_level > 0;
1323         if (encap)
1324                 features &= skb->dev->hw_enc_features;
1325         SKB_GSO_CB(skb)->encap_level += ihl;
1326 
1327         skb_reset_transport_header(skb);
1328 
1329         segs = ERR_PTR(-EPROTONOSUPPORT);
1330 
1331         if (!skb->encapsulation || encap) {
1332                 udpfrag = !!(skb_shinfo(skb)->gso_type & SKB_GSO_UDP);
1333                 fixedid = !!(skb_shinfo(skb)->gso_type & SKB_GSO_TCP_FIXEDID);
1334 
1335                 /* fixed ID is invalid if DF bit is not set */
1336                 if (fixedid && !(ip_hdr(skb)->frag_off & htons(IP_DF)))
1337                         goto out;
1338         }
1339 
1340         ops = rcu_dereference(inet_offloads[proto]);
1341         if (likely(ops && ops->callbacks.gso_segment))
1342                 segs = ops->callbacks.gso_segment(skb, features);
1343 
1344         if (IS_ERR_OR_NULL(segs))
1345                 goto out;
1346 
1347         gso_partial = !!(skb_shinfo(segs)->gso_type & SKB_GSO_PARTIAL);
1348 
1349         skb = segs;
1350         do {
1351                 iph = (struct iphdr *)(skb_mac_header(skb) + nhoff);
1352                 if (udpfrag) {
1353                         iph->frag_off = htons(offset >> 3);
1354                         if (skb->next)
1355                                 iph->frag_off |= htons(IP_MF);
1356                         offset += skb->len - nhoff - ihl;
1357                         tot_len = skb->len - nhoff;
1358                 } else if (skb_is_gso(skb)) {
1359                         if (!fixedid) {
1360                                 iph->id = htons(id);
1361                                 id += skb_shinfo(skb)->gso_segs;
1362                         }
1363 
1364                         if (gso_partial)
1365                                 tot_len = skb_shinfo(skb)->gso_size +
1366                                           SKB_GSO_CB(skb)->data_offset +
1367                                           skb->head - (unsigned char *)iph;
1368                         else
1369                                 tot_len = skb->len - nhoff;
1370                 } else {
1371                         if (!fixedid)
1372                                 iph->id = htons(id++);
1373                         tot_len = skb->len - nhoff;
1374                 }
1375                 iph->tot_len = htons(tot_len);
1376                 ip_send_check(iph);
1377                 if (encap)
1378                         skb_reset_inner_headers(skb);
1379                 skb->network_header = (u8 *)iph - skb->head;
1380                 skb_reset_mac_len(skb);
1381         } while ((skb = skb->next));
1382 
1383 out:
1384         return segs;
1385 }
1386 EXPORT_SYMBOL(inet_gso_segment);
1387 
1388 struct sk_buff *inet_gro_receive(struct list_head *head, struct sk_buff *skb)
1389 {
1390         const struct net_offload *ops;
1391         struct sk_buff *pp = NULL;
1392         const struct iphdr *iph;
1393         struct sk_buff *p;
1394         unsigned int hlen;
1395         unsigned int off;
1396         unsigned int id;
1397         int flush = 1;
1398         int proto;
1399 
1400         off = skb_gro_offset(skb);
1401         hlen = off + sizeof(*iph);
1402         iph = skb_gro_header_fast(skb, off);
1403         if (skb_gro_header_hard(skb, hlen)) {
1404                 iph = skb_gro_header_slow(skb, hlen, off);
1405                 if (unlikely(!iph))
1406                         goto out;
1407         }
1408 
1409         proto = iph->protocol;
1410 
1411         rcu_read_lock();
1412         ops = rcu_dereference(inet_offloads[proto]);
1413         if (!ops || !ops->callbacks.gro_receive)
1414                 goto out_unlock;
1415 
1416         if (*(u8 *)iph != 0x45)
1417                 goto out_unlock;
1418 
1419         if (ip_is_fragment(iph))
1420                 goto out_unlock;
1421 
1422         if (unlikely(ip_fast_csum((u8 *)iph, 5)))
1423                 goto out_unlock;
1424 
1425         id = ntohl(*(__be32 *)&iph->id);
1426         flush = (u16)((ntohl(*(__be32 *)iph) ^ skb_gro_len(skb)) | (id & ~IP_DF));
1427         id >>= 16;
1428 
1429         list_for_each_entry(p, head, list) {
1430                 struct iphdr *iph2;
1431                 u16 flush_id;
1432 
1433                 if (!NAPI_GRO_CB(p)->same_flow)
1434                         continue;
1435 
1436                 iph2 = (struct iphdr *)(p->data + off);
1437                 /* The above works because, with the exception of the top
1438                  * (inner most) layer, we only aggregate pkts with the same
1439                  * hdr length so all the hdrs we'll need to verify will start
1440                  * at the same offset.
1441                  */
1442                 if ((iph->protocol ^ iph2->protocol) |
1443                     ((__force u32)iph->saddr ^ (__force u32)iph2->saddr) |
1444                     ((__force u32)iph->daddr ^ (__force u32)iph2->daddr)) {
1445                         NAPI_GRO_CB(p)->same_flow = 0;
1446                         continue;
1447                 }
1448 
1449                 /* All fields must match except length and checksum. */
1450                 NAPI_GRO_CB(p)->flush |=
1451                         (iph->ttl ^ iph2->ttl) |
1452                         (iph->tos ^ iph2->tos) |
1453                         ((iph->frag_off ^ iph2->frag_off) & htons(IP_DF));
1454 
1455                 NAPI_GRO_CB(p)->flush |= flush;
1456 
1457                 /* We need to store of the IP ID check to be included later
1458                  * when we can verify that this packet does in fact belong
1459                  * to a given flow.
1460                  */
1461                 flush_id = (u16)(id - ntohs(iph2->id));
1462 
1463                 /* This bit of code makes it much easier for us to identify
1464                  * the cases where we are doing atomic vs non-atomic IP ID
1465                  * checks.  Specifically an atomic check can return IP ID
1466                  * values 0 - 0xFFFF, while a non-atomic check can only
1467                  * return 0 or 0xFFFF.
1468                  */
1469                 if (!NAPI_GRO_CB(p)->is_atomic ||
1470                     !(iph->frag_off & htons(IP_DF))) {
1471                         flush_id ^= NAPI_GRO_CB(p)->count;
1472                         flush_id = flush_id ? 0xFFFF : 0;
1473                 }
1474 
1475                 /* If the previous IP ID value was based on an atomic
1476                  * datagram we can overwrite the value and ignore it.
1477                  */
1478                 if (NAPI_GRO_CB(skb)->is_atomic)
1479                         NAPI_GRO_CB(p)->flush_id = flush_id;
1480                 else
1481                         NAPI_GRO_CB(p)->flush_id |= flush_id;
1482         }
1483 
1484         NAPI_GRO_CB(skb)->is_atomic = !!(iph->frag_off & htons(IP_DF));
1485         NAPI_GRO_CB(skb)->flush |= flush;
1486         skb_set_network_header(skb, off);
1487         /* The above will be needed by the transport layer if there is one
1488          * immediately following this IP hdr.
1489          */
1490 
1491         /* Note : No need to call skb_gro_postpull_rcsum() here,
1492          * as we already checked checksum over ipv4 header was 0
1493          */
1494         skb_gro_pull(skb, sizeof(*iph));
1495         skb_set_transport_header(skb, skb_gro_offset(skb));
1496 
1497         pp = call_gro_receive(ops->callbacks.gro_receive, head, skb);
1498 
1499 out_unlock:
1500         rcu_read_unlock();
1501 
1502 out:
1503         skb_gro_flush_final(skb, pp, flush);
1504 
1505         return pp;
1506 }
1507 EXPORT_SYMBOL(inet_gro_receive);
1508 
1509 static struct sk_buff *ipip_gro_receive(struct list_head *head,
1510                                         struct sk_buff *skb)
1511 {
1512         if (NAPI_GRO_CB(skb)->encap_mark) {
1513                 NAPI_GRO_CB(skb)->flush = 1;
1514                 return NULL;
1515         }
1516 
1517         NAPI_GRO_CB(skb)->encap_mark = 1;
1518 
1519         return inet_gro_receive(head, skb);
1520 }
1521 
1522 #define SECONDS_PER_DAY 86400
1523 
1524 /* inet_current_timestamp - Return IP network timestamp
1525  *
1526  * Return milliseconds since midnight in network byte order.
1527  */
1528 __be32 inet_current_timestamp(void)
1529 {
1530         u32 secs;
1531         u32 msecs;
1532         struct timespec64 ts;
1533 
1534         ktime_get_real_ts64(&ts);
1535 
1536         /* Get secs since midnight. */
1537         (void)div_u64_rem(ts.tv_sec, SECONDS_PER_DAY, &secs);
1538         /* Convert to msecs. */
1539         msecs = secs * MSEC_PER_SEC;
1540         /* Convert nsec to msec. */
1541         msecs += (u32)ts.tv_nsec / NSEC_PER_MSEC;
1542 
1543         /* Convert to network byte order. */
1544         return htonl(msecs);
1545 }
1546 EXPORT_SYMBOL(inet_current_timestamp);
1547 
1548 int inet_recv_error(struct sock *sk, struct msghdr *msg, int len, int *addr_len)
1549 {
1550         if (sk->sk_family == AF_INET)
1551                 return ip_recv_error(sk, msg, len, addr_len);
1552 #if IS_ENABLED(CONFIG_IPV6)
1553         if (sk->sk_family == AF_INET6)
1554                 return pingv6_ops.ipv6_recv_error(sk, msg, len, addr_len);
1555 #endif
1556         return -EINVAL;
1557 }
1558 
1559 int inet_gro_complete(struct sk_buff *skb, int nhoff)
1560 {
1561         __be16 newlen = htons(skb->len - nhoff);
1562         struct iphdr *iph = (struct iphdr *)(skb->data + nhoff);
1563         const struct net_offload *ops;
1564         int proto = iph->protocol;
1565         int err = -ENOSYS;
1566 
1567         if (skb->encapsulation) {
1568                 skb_set_inner_protocol(skb, cpu_to_be16(ETH_P_IP));
1569                 skb_set_inner_network_header(skb, nhoff);
1570         }
1571 
1572         csum_replace2(&iph->check, iph->tot_len, newlen);
1573         iph->tot_len = newlen;
1574 
1575         rcu_read_lock();
1576         ops = rcu_dereference(inet_offloads[proto]);
1577         if (WARN_ON(!ops || !ops->callbacks.gro_complete))
1578                 goto out_unlock;
1579 
1580         /* Only need to add sizeof(*iph) to get to the next hdr below
1581          * because any hdr with option will have been flushed in
1582          * inet_gro_receive().
1583          */
1584         err = ops->callbacks.gro_complete(skb, nhoff + sizeof(*iph));
1585 
1586 out_unlock:
1587         rcu_read_unlock();
1588 
1589         return err;
1590 }
1591 EXPORT_SYMBOL(inet_gro_complete);
1592 
1593 static int ipip_gro_complete(struct sk_buff *skb, int nhoff)
1594 {
1595         skb->encapsulation = 1;
1596         skb_shinfo(skb)->gso_type |= SKB_GSO_IPXIP4;
1597         return inet_gro_complete(skb, nhoff);
1598 }
1599 
1600 int inet_ctl_sock_create(struct sock **sk, unsigned short family,
1601                          unsigned short type, unsigned char protocol,
1602                          struct net *net)
1603 {
1604         struct socket *sock;
1605         int rc = sock_create_kern(net, family, type, protocol, &sock);
1606 
1607         if (rc == 0) {
1608                 *sk = sock->sk;
1609                 (*sk)->sk_allocation = GFP_ATOMIC;
1610                 /*
1611                  * Unhash it so that IP input processing does not even see it,
1612                  * we do not wish this socket to see incoming packets.
1613                  */
1614                 (*sk)->sk_prot->unhash(*sk);
1615         }
1616         return rc;
1617 }
1618 EXPORT_SYMBOL_GPL(inet_ctl_sock_create);
1619 
1620 u64 snmp_get_cpu_field(void __percpu *mib, int cpu, int offt)
1621 {
1622         return  *(((unsigned long *)per_cpu_ptr(mib, cpu)) + offt);
1623 }
1624 EXPORT_SYMBOL_GPL(snmp_get_cpu_field);
1625 
1626 unsigned long snmp_fold_field(void __percpu *mib, int offt)
1627 {
1628         unsigned long res = 0;
1629         int i;
1630 
1631         for_each_possible_cpu(i)
1632                 res += snmp_get_cpu_field(mib, i, offt);
1633         return res;
1634 }
1635 EXPORT_SYMBOL_GPL(snmp_fold_field);
1636 
1637 #if BITS_PER_LONG==32
1638 
1639 u64 snmp_get_cpu_field64(void __percpu *mib, int cpu, int offt,
1640                          size_t syncp_offset)
1641 {
1642         void *bhptr;
1643         struct u64_stats_sync *syncp;
1644         u64 v;
1645         unsigned int start;
1646 
1647         bhptr = per_cpu_ptr(mib, cpu);
1648         syncp = (struct u64_stats_sync *)(bhptr + syncp_offset);
1649         do {
1650                 start = u64_stats_fetch_begin_irq(syncp);
1651                 v = *(((u64 *)bhptr) + offt);
1652         } while (u64_stats_fetch_retry_irq(syncp, start));
1653 
1654         return v;
1655 }
1656 EXPORT_SYMBOL_GPL(snmp_get_cpu_field64);
1657 
1658 u64 snmp_fold_field64(void __percpu *mib, int offt, size_t syncp_offset)
1659 {
1660         u64 res = 0;
1661         int cpu;
1662 
1663         for_each_possible_cpu(cpu) {
1664                 res += snmp_get_cpu_field64(mib, cpu, offt, syncp_offset);
1665         }
1666         return res;
1667 }
1668 EXPORT_SYMBOL_GPL(snmp_fold_field64);
1669 #endif
1670 
1671 #ifdef CONFIG_IP_MULTICAST
1672 static const struct net_protocol igmp_protocol = {
1673         .handler =      igmp_rcv,
1674         .netns_ok =     1,
1675 };
1676 #endif
1677 
1678 /* thinking of making this const? Don't.
1679  * early_demux can change based on sysctl.
1680  */
1681 static struct net_protocol tcp_protocol = {
1682         .early_demux    =       tcp_v4_early_demux,
1683         .early_demux_handler =  tcp_v4_early_demux,
1684         .handler        =       tcp_v4_rcv,
1685         .err_handler    =       tcp_v4_err,
1686         .no_policy      =       1,
1687         .netns_ok       =       1,
1688         .icmp_strict_tag_validation = 1,
1689 };
1690 
1691 /* thinking of making this const? Don't.
1692  * early_demux can change based on sysctl.
1693  */
1694 static struct net_protocol udp_protocol = {
1695         .early_demux =  udp_v4_early_demux,
1696         .early_demux_handler =  udp_v4_early_demux,
1697         .handler =      udp_rcv,
1698         .err_handler =  udp_err,
1699         .no_policy =    1,
1700         .netns_ok =     1,
1701 };
1702 
1703 static const struct net_protocol icmp_protocol = {
1704         .handler =      icmp_rcv,
1705         .err_handler =  icmp_err,
1706         .no_policy =    1,
1707         .netns_ok =     1,
1708 };
1709 
1710 static __net_init int ipv4_mib_init_net(struct net *net)
1711 {
1712         int i;
1713 
1714         net->mib.tcp_statistics = alloc_percpu(struct tcp_mib);
1715         if (!net->mib.tcp_statistics)
1716                 goto err_tcp_mib;
1717         net->mib.ip_statistics = alloc_percpu(struct ipstats_mib);
1718         if (!net->mib.ip_statistics)
1719                 goto err_ip_mib;
1720 
1721         for_each_possible_cpu(i) {
1722                 struct ipstats_mib *af_inet_stats;
1723                 af_inet_stats = per_cpu_ptr(net->mib.ip_statistics, i);
1724                 u64_stats_init(&af_inet_stats->syncp);
1725         }
1726 
1727         net->mib.net_statistics = alloc_percpu(struct linux_mib);
1728         if (!net->mib.net_statistics)
1729                 goto err_net_mib;
1730         net->mib.udp_statistics = alloc_percpu(struct udp_mib);
1731         if (!net->mib.udp_statistics)
1732                 goto err_udp_mib;
1733         net->mib.udplite_statistics = alloc_percpu(struct udp_mib);
1734         if (!net->mib.udplite_statistics)
1735                 goto err_udplite_mib;
1736         net->mib.icmp_statistics = alloc_percpu(struct icmp_mib);
1737         if (!net->mib.icmp_statistics)
1738                 goto err_icmp_mib;
1739         net->mib.icmpmsg_statistics = kzalloc(sizeof(struct icmpmsg_mib),
1740                                               GFP_KERNEL);
1741         if (!net->mib.icmpmsg_statistics)
1742                 goto err_icmpmsg_mib;
1743 
1744         tcp_mib_init(net);
1745         return 0;
1746 
1747 err_icmpmsg_mib:
1748         free_percpu(net->mib.icmp_statistics);
1749 err_icmp_mib:
1750         free_percpu(net->mib.udplite_statistics);
1751 err_udplite_mib:
1752         free_percpu(net->mib.udp_statistics);
1753 err_udp_mib:
1754         free_percpu(net->mib.net_statistics);
1755 err_net_mib:
1756         free_percpu(net->mib.ip_statistics);
1757 err_ip_mib:
1758         free_percpu(net->mib.tcp_statistics);
1759 err_tcp_mib:
1760         return -ENOMEM;
1761 }
1762 
1763 static __net_exit void ipv4_mib_exit_net(struct net *net)
1764 {
1765         kfree(net->mib.icmpmsg_statistics);
1766         free_percpu(net->mib.icmp_statistics);
1767         free_percpu(net->mib.udplite_statistics);
1768         free_percpu(net->mib.udp_statistics);
1769         free_percpu(net->mib.net_statistics);
1770         free_percpu(net->mib.ip_statistics);
1771         free_percpu(net->mib.tcp_statistics);
1772 }
1773 
1774 static __net_initdata struct pernet_operations ipv4_mib_ops = {
1775         .init = ipv4_mib_init_net,
1776         .exit = ipv4_mib_exit_net,
1777 };
1778 
1779 static int __init init_ipv4_mibs(void)
1780 {
1781         return register_pernet_subsys(&ipv4_mib_ops);
1782 }
1783 
1784 static __net_init int inet_init_net(struct net *net)
1785 {
1786         /*
1787          * Set defaults for local port range
1788          */
1789         seqlock_init(&net->ipv4.ip_local_ports.lock);
1790         net->ipv4.ip_local_ports.range[0] =  32768;
1791         net->ipv4.ip_local_ports.range[1] =  60999;
1792 
1793         seqlock_init(&net->ipv4.ping_group_range.lock);
1794         /*
1795          * Sane defaults - nobody may create ping sockets.
1796          * Boot scripts should set this to distro-specific group.
1797          */
1798         net->ipv4.ping_group_range.range[0] = make_kgid(&init_user_ns, 1);
1799         net->ipv4.ping_group_range.range[1] = make_kgid(&init_user_ns, 0);
1800 
1801         /* Default values for sysctl-controlled parameters.
1802          * We set them here, in case sysctl is not compiled.
1803          */
1804         net->ipv4.sysctl_ip_default_ttl = IPDEFTTL;
1805         net->ipv4.sysctl_ip_fwd_update_priority = 1;
1806         net->ipv4.sysctl_ip_dynaddr = 0;
1807         net->ipv4.sysctl_ip_early_demux = 1;
1808         net->ipv4.sysctl_udp_early_demux = 1;
1809         net->ipv4.sysctl_tcp_early_demux = 1;
1810 #ifdef CONFIG_SYSCTL
1811         net->ipv4.sysctl_ip_prot_sock = PROT_SOCK;
1812 #endif
1813 
1814         /* Some igmp sysctl, whose values are always used */
1815         net->ipv4.sysctl_igmp_max_memberships = 20;
1816         net->ipv4.sysctl_igmp_max_msf = 10;
1817         /* IGMP reports for link-local multicast groups are enabled by default */
1818         net->ipv4.sysctl_igmp_llm_reports = 1;
1819         net->ipv4.sysctl_igmp_qrv = 2;
1820 
1821         return 0;
1822 }
1823 
1824 static __net_exit void inet_exit_net(struct net *net)
1825 {
1826 }
1827 
1828 static __net_initdata struct pernet_operations af_inet_ops = {
1829         .init = inet_init_net,
1830         .exit = inet_exit_net,
1831 };
1832 
1833 static int __init init_inet_pernet_ops(void)
1834 {
1835         return register_pernet_subsys(&af_inet_ops);
1836 }
1837 
1838 static int ipv4_proc_init(void);
1839 
1840 /*
1841  *      IP protocol layer initialiser
1842  */
1843 
1844 static struct packet_offload ip_packet_offload __read_mostly = {
1845         .type = cpu_to_be16(ETH_P_IP),
1846         .callbacks = {
1847                 .gso_segment = inet_gso_segment,
1848                 .gro_receive = inet_gro_receive,
1849                 .gro_complete = inet_gro_complete,
1850         },
1851 };
1852 
1853 static const struct net_offload ipip_offload = {
1854         .callbacks = {
1855                 .gso_segment    = inet_gso_segment,
1856                 .gro_receive    = ipip_gro_receive,
1857                 .gro_complete   = ipip_gro_complete,
1858         },
1859 };
1860 
1861 static int __init ipip_offload_init(void)
1862 {
1863         return inet_add_offload(&ipip_offload, IPPROTO_IPIP);
1864 }
1865 
1866 static int __init ipv4_offload_init(void)
1867 {
1868         /*
1869          * Add offloads
1870          */
1871         if (udpv4_offload_init() < 0)
1872                 pr_crit("%s: Cannot add UDP protocol offload\n", __func__);
1873         if (tcpv4_offload_init() < 0)
1874                 pr_crit("%s: Cannot add TCP protocol offload\n", __func__);
1875         if (ipip_offload_init() < 0)
1876                 pr_crit("%s: Cannot add IPIP protocol offload\n", __func__);
1877 
1878         dev_add_offload(&ip_packet_offload);
1879         return 0;
1880 }
1881 
1882 fs_initcall(ipv4_offload_init);
1883 
1884 static struct packet_type ip_packet_type __read_mostly = {
1885         .type = cpu_to_be16(ETH_P_IP),
1886         .func = ip_rcv,
1887         .list_func = ip_list_rcv,
1888 };
1889 
1890 static int __init inet_init(void)
1891 {
1892         struct inet_protosw *q;
1893         struct list_head *r;
1894         int rc = -EINVAL;
1895 
1896         sock_skb_cb_check_size(sizeof(struct inet_skb_parm));
1897 
1898         rc = proto_register(&tcp_prot, 1);
1899         if (rc)
1900                 goto out;
1901 
1902         rc = proto_register(&udp_prot, 1);
1903         if (rc)
1904                 goto out_unregister_tcp_proto;
1905 
1906         rc = proto_register(&raw_prot, 1);
1907         if (rc)
1908                 goto out_unregister_udp_proto;
1909 
1910         rc = proto_register(&ping_prot, 1);
1911         if (rc)
1912                 goto out_unregister_raw_proto;
1913 
1914         /*
1915          *      Tell SOCKET that we are alive...
1916          */
1917 
1918         (void)sock_register(&inet_family_ops);
1919 
1920 #ifdef CONFIG_SYSCTL
1921         ip_static_sysctl_init();
1922 #endif
1923 
1924         /*
1925          *      Add all the base protocols.
1926          */
1927 
1928         if (inet_add_protocol(&icmp_protocol, IPPROTO_ICMP) < 0)
1929                 pr_crit("%s: Cannot add ICMP protocol\n", __func__);
1930         if (inet_add_protocol(&udp_protocol, IPPROTO_UDP) < 0)
1931                 pr_crit("%s: Cannot add UDP protocol\n", __func__);
1932         if (inet_add_protocol(&tcp_protocol, IPPROTO_TCP) < 0)
1933                 pr_crit("%s: Cannot add TCP protocol\n", __func__);
1934 #ifdef CONFIG_IP_MULTICAST
1935         if (inet_add_protocol(&igmp_protocol, IPPROTO_IGMP) < 0)
1936                 pr_crit("%s: Cannot add IGMP protocol\n", __func__);
1937 #endif
1938 
1939         /* Register the socket-side information for inet_create. */
1940         for (r = &inetsw[0]; r < &inetsw[SOCK_MAX]; ++r)
1941                 INIT_LIST_HEAD(r);
1942 
1943         for (q = inetsw_array; q < &inetsw_array[INETSW_ARRAY_LEN]; ++q)
1944                 inet_register_protosw(q);
1945 
1946         /*
1947          *      Set the ARP module up
1948          */
1949 
1950         arp_init();
1951 
1952         /*
1953          *      Set the IP module up
1954          */
1955 
1956         ip_init();
1957 
1958         /* Setup TCP slab cache for open requests. */
1959         tcp_init();
1960 
1961         /* Setup UDP memory threshold */
1962         udp_init();
1963 
1964         /* Add UDP-Lite (RFC 3828) */
1965         udplite4_register();
1966 
1967         ping_init();
1968 
1969         /*
1970          *      Set the ICMP layer up
1971          */
1972 
1973         if (icmp_init() < 0)
1974                 panic("Failed to create the ICMP control socket.\n");
1975 
1976         /*
1977          *      Initialise the multicast router
1978          */
1979 #if defined(CONFIG_IP_MROUTE)
1980         if (ip_mr_init())
1981                 pr_crit("%s: Cannot init ipv4 mroute\n", __func__);
1982 #endif
1983 
1984         if (init_inet_pernet_ops())
1985                 pr_crit("%s: Cannot init ipv4 inet pernet ops\n", __func__);
1986         /*
1987          *      Initialise per-cpu ipv4 mibs
1988          */
1989 
1990         if (init_ipv4_mibs())
1991                 pr_crit("%s: Cannot init ipv4 mibs\n", __func__);
1992 
1993         ipv4_proc_init();
1994 
1995         ipfrag_init();
1996 
1997         dev_add_pack(&ip_packet_type);
1998 
1999         ip_tunnel_core_init();
2000 
2001         rc = 0;
2002 out:
2003         return rc;
2004 out_unregister_raw_proto:
2005         proto_unregister(&raw_prot);
2006 out_unregister_udp_proto:
2007         proto_unregister(&udp_prot);
2008 out_unregister_tcp_proto:
2009         proto_unregister(&tcp_prot);
2010         goto out;
2011 }
2012 
2013 fs_initcall(inet_init);
2014 
2015 /* ------------------------------------------------------------------------ */
2016 
2017 #ifdef CONFIG_PROC_FS
2018 static int __init ipv4_proc_init(void)
2019 {
2020         int rc = 0;
2021 
2022         if (raw_proc_init())
2023                 goto out_raw;
2024         if (tcp4_proc_init())
2025                 goto out_tcp;
2026         if (udp4_proc_init())
2027                 goto out_udp;
2028         if (ping_proc_init())
2029                 goto out_ping;
2030         if (ip_misc_proc_init())
2031                 goto out_misc;
2032 out:
2033         return rc;
2034 out_misc:
2035         ping_proc_exit();
2036 out_ping:
2037         udp4_proc_exit();
2038 out_udp:
2039         tcp4_proc_exit();
2040 out_tcp:
2041         raw_proc_exit();
2042 out_raw:
2043         rc = -ENOMEM;
2044         goto out;
2045 }
2046 
2047 #else /* CONFIG_PROC_FS */
2048 static int __init ipv4_proc_init(void)
2049 {
2050         return 0;
2051 }
2052 #endif /* CONFIG_PROC_FS */
2053 

~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

kernel.org | git.kernel.org | LWN.net | Project Home | Wiki (Japanese) | Wiki (English) | SVN repository | Mail admin

Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.

osdn.jp