The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/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/module.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 <asm/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/ipip.h>
  115 #include <net/inet_common.h>
  116 #include <net/xfrm.h>
  117 #include <net/net_namespace.h>
  118 #ifdef CONFIG_IP_MROUTE
  119 #include <linux/mroute.h>
  120 #endif
  121 
  122 
  123 /* The inetsw table contains everything that inet_create needs to
  124  * build a new socket.
  125  */
  126 static struct list_head inetsw[SOCK_MAX];
  127 static DEFINE_SPINLOCK(inetsw_lock);
  128 
  129 struct ipv4_config ipv4_config;
  130 EXPORT_SYMBOL(ipv4_config);
  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(atomic_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;
  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                 /* Check special setups for testing purpose to enable TFO w/o
  216                  * requiring TCP_FASTOPEN sockopt.
  217                  * Note that only TCP sockets (SOCK_STREAM) will reach here.
  218                  * Also fastopenq may already been allocated because this
  219                  * socket was in TCP_LISTEN state previously but was
  220                  * shutdown() (rather than close()).
  221                  */
  222                 if ((sysctl_tcp_fastopen & TFO_SERVER_ENABLE) != 0 &&
  223                     inet_csk(sk)->icsk_accept_queue.fastopenq == NULL) {
  224                         if ((sysctl_tcp_fastopen & TFO_SERVER_WO_SOCKOPT1) != 0)
  225                                 err = fastopen_init_queue(sk, backlog);
  226                         else if ((sysctl_tcp_fastopen &
  227                                   TFO_SERVER_WO_SOCKOPT2) != 0)
  228                                 err = fastopen_init_queue(sk,
  229                                     ((uint)sysctl_tcp_fastopen) >> 16);
  230                         else
  231                                 err = 0;
  232                         if (err)
  233                                 goto out;
  234                 }
  235                 err = inet_csk_listen_start(sk, backlog);
  236                 if (err)
  237                         goto out;
  238         }
  239         sk->sk_max_ack_backlog = backlog;
  240         err = 0;
  241 
  242 out:
  243         release_sock(sk);
  244         return err;
  245 }
  246 EXPORT_SYMBOL(inet_listen);
  247 
  248 u32 inet_ehash_secret __read_mostly;
  249 EXPORT_SYMBOL(inet_ehash_secret);
  250 
  251 /*
  252  * inet_ehash_secret must be set exactly once
  253  */
  254 void build_ehash_secret(void)
  255 {
  256         u32 rnd;
  257 
  258         do {
  259                 get_random_bytes(&rnd, sizeof(rnd));
  260         } while (rnd == 0);
  261 
  262         cmpxchg(&inet_ehash_secret, 0, rnd);
  263 }
  264 EXPORT_SYMBOL(build_ehash_secret);
  265 
  266 static inline int inet_netns_ok(struct net *net, __u8 protocol)
  267 {
  268         const struct net_protocol *ipprot;
  269 
  270         if (net_eq(net, &init_net))
  271                 return 1;
  272 
  273         ipprot = rcu_dereference(inet_protos[protocol]);
  274         if (ipprot == NULL) {
  275                 /* raw IP is OK */
  276                 return 1;
  277         }
  278         return ipprot->netns_ok;
  279 }
  280 
  281 /*
  282  *      Create an inet socket.
  283  */
  284 
  285 static int inet_create(struct net *net, struct socket *sock, int protocol,
  286                        int kern)
  287 {
  288         struct sock *sk;
  289         struct inet_protosw *answer;
  290         struct inet_sock *inet;
  291         struct proto *answer_prot;
  292         unsigned char answer_flags;
  293         char answer_no_check;
  294         int try_loading_module = 0;
  295         int err;
  296 
  297         if (unlikely(!inet_ehash_secret))
  298                 if (sock->type != SOCK_RAW && sock->type != SOCK_DGRAM)
  299                         build_ehash_secret();
  300 
  301         sock->state = SS_UNCONNECTED;
  302 
  303         /* Look for the requested type/protocol pair. */
  304 lookup_protocol:
  305         err = -ESOCKTNOSUPPORT;
  306         rcu_read_lock();
  307         list_for_each_entry_rcu(answer, &inetsw[sock->type], list) {
  308 
  309                 err = 0;
  310                 /* Check the non-wild match. */
  311                 if (protocol == answer->protocol) {
  312                         if (protocol != IPPROTO_IP)
  313                                 break;
  314                 } else {
  315                         /* Check for the two wild cases. */
  316                         if (IPPROTO_IP == protocol) {
  317                                 protocol = answer->protocol;
  318                                 break;
  319                         }
  320                         if (IPPROTO_IP == answer->protocol)
  321                                 break;
  322                 }
  323                 err = -EPROTONOSUPPORT;
  324         }
  325 
  326         if (unlikely(err)) {
  327                 if (try_loading_module < 2) {
  328                         rcu_read_unlock();
  329                         /*
  330                          * Be more specific, e.g. net-pf-2-proto-132-type-1
  331                          * (net-pf-PF_INET-proto-IPPROTO_SCTP-type-SOCK_STREAM)
  332                          */
  333                         if (++try_loading_module == 1)
  334                                 request_module("net-pf-%d-proto-%d-type-%d",
  335                                                PF_INET, protocol, sock->type);
  336                         /*
  337                          * Fall back to generic, e.g. net-pf-2-proto-132
  338                          * (net-pf-PF_INET-proto-IPPROTO_SCTP)
  339                          */
  340                         else
  341                                 request_module("net-pf-%d-proto-%d",
  342                                                PF_INET, protocol);
  343                         goto lookup_protocol;
  344                 } else
  345                         goto out_rcu_unlock;
  346         }
  347 
  348         err = -EPERM;
  349         if (sock->type == SOCK_RAW && !kern &&
  350             !ns_capable(net->user_ns, CAP_NET_RAW))
  351                 goto out_rcu_unlock;
  352 
  353         err = -EAFNOSUPPORT;
  354         if (!inet_netns_ok(net, protocol))
  355                 goto out_rcu_unlock;
  356 
  357         sock->ops = answer->ops;
  358         answer_prot = answer->prot;
  359         answer_no_check = answer->no_check;
  360         answer_flags = answer->flags;
  361         rcu_read_unlock();
  362 
  363         WARN_ON(answer_prot->slab == NULL);
  364 
  365         err = -ENOBUFS;
  366         sk = sk_alloc(net, PF_INET, GFP_KERNEL, answer_prot);
  367         if (sk == NULL)
  368                 goto out;
  369 
  370         err = 0;
  371         sk->sk_no_check = answer_no_check;
  372         if (INET_PROTOSW_REUSE & answer_flags)
  373                 sk->sk_reuse = SK_CAN_REUSE;
  374 
  375         inet = inet_sk(sk);
  376         inet->is_icsk = (INET_PROTOSW_ICSK & answer_flags) != 0;
  377 
  378         inet->nodefrag = 0;
  379 
  380         if (SOCK_RAW == sock->type) {
  381                 inet->inet_num = protocol;
  382                 if (IPPROTO_RAW == protocol)
  383                         inet->hdrincl = 1;
  384         }
  385 
  386         if (ipv4_config.no_pmtu_disc)
  387                 inet->pmtudisc = IP_PMTUDISC_DONT;
  388         else
  389                 inet->pmtudisc = IP_PMTUDISC_WANT;
  390 
  391         inet->inet_id = 0;
  392 
  393         sock_init_data(sock, sk);
  394 
  395         sk->sk_destruct    = inet_sock_destruct;
  396         sk->sk_protocol    = protocol;
  397         sk->sk_backlog_rcv = sk->sk_prot->backlog_rcv;
  398 
  399         inet->uc_ttl    = -1;
  400         inet->mc_loop   = 1;
  401         inet->mc_ttl    = 1;
  402         inet->mc_all    = 1;
  403         inet->mc_index  = 0;
  404         inet->mc_list   = NULL;
  405         inet->rcv_tos   = 0;
  406 
  407         sk_refcnt_debug_inc(sk);
  408 
  409         if (inet->inet_num) {
  410                 /* It assumes that any protocol which allows
  411                  * the user to assign a number at socket
  412                  * creation time automatically
  413                  * shares.
  414                  */
  415                 inet->inet_sport = htons(inet->inet_num);
  416                 /* Add to protocol hash chains. */
  417                 sk->sk_prot->hash(sk);
  418         }
  419 
  420         if (sk->sk_prot->init) {
  421                 err = sk->sk_prot->init(sk);
  422                 if (err)
  423                         sk_common_release(sk);
  424         }
  425 out:
  426         return err;
  427 out_rcu_unlock:
  428         rcu_read_unlock();
  429         goto out;
  430 }
  431 
  432 
  433 /*
  434  *      The peer socket should always be NULL (or else). When we call this
  435  *      function we are destroying the object and from then on nobody
  436  *      should refer to it.
  437  */
  438 int inet_release(struct socket *sock)
  439 {
  440         struct sock *sk = sock->sk;
  441 
  442         if (sk) {
  443                 long timeout;
  444 
  445                 sock_rps_reset_flow(sk);
  446 
  447                 /* Applications forget to leave groups before exiting */
  448                 ip_mc_drop_socket(sk);
  449 
  450                 /* If linger is set, we don't return until the close
  451                  * is complete.  Otherwise we return immediately. The
  452                  * actually closing is done the same either way.
  453                  *
  454                  * If the close is due to the process exiting, we never
  455                  * linger..
  456                  */
  457                 timeout = 0;
  458                 if (sock_flag(sk, SOCK_LINGER) &&
  459                     !(current->flags & PF_EXITING))
  460                         timeout = sk->sk_lingertime;
  461                 sock->sk = NULL;
  462                 sk->sk_prot->close(sk, timeout);
  463         }
  464         return 0;
  465 }
  466 EXPORT_SYMBOL(inet_release);
  467 
  468 /* It is off by default, see below. */
  469 int sysctl_ip_nonlocal_bind __read_mostly;
  470 EXPORT_SYMBOL(sysctl_ip_nonlocal_bind);
  471 
  472 int inet_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
  473 {
  474         struct sockaddr_in *addr = (struct sockaddr_in *)uaddr;
  475         struct sock *sk = sock->sk;
  476         struct inet_sock *inet = inet_sk(sk);
  477         struct net *net = sock_net(sk);
  478         unsigned short snum;
  479         int chk_addr_ret;
  480         int err;
  481 
  482         /* If the socket has its own bind function then use it. (RAW) */
  483         if (sk->sk_prot->bind) {
  484                 err = sk->sk_prot->bind(sk, uaddr, addr_len);
  485                 goto out;
  486         }
  487         err = -EINVAL;
  488         if (addr_len < sizeof(struct sockaddr_in))
  489                 goto out;
  490 
  491         if (addr->sin_family != AF_INET) {
  492                 /* Compatibility games : accept AF_UNSPEC (mapped to AF_INET)
  493                  * only if s_addr is INADDR_ANY.
  494                  */
  495                 err = -EAFNOSUPPORT;
  496                 if (addr->sin_family != AF_UNSPEC ||
  497                     addr->sin_addr.s_addr != htonl(INADDR_ANY))
  498                         goto out;
  499         }
  500 
  501         chk_addr_ret = inet_addr_type(net, addr->sin_addr.s_addr);
  502 
  503         /* Not specified by any standard per-se, however it breaks too
  504          * many applications when removed.  It is unfortunate since
  505          * allowing applications to make a non-local bind solves
  506          * several problems with systems using dynamic addressing.
  507          * (ie. your servers still start up even if your ISDN link
  508          *  is temporarily down)
  509          */
  510         err = -EADDRNOTAVAIL;
  511         if (!sysctl_ip_nonlocal_bind &&
  512             !(inet->freebind || inet->transparent) &&
  513             addr->sin_addr.s_addr != htonl(INADDR_ANY) &&
  514             chk_addr_ret != RTN_LOCAL &&
  515             chk_addr_ret != RTN_MULTICAST &&
  516             chk_addr_ret != RTN_BROADCAST)
  517                 goto out;
  518 
  519         snum = ntohs(addr->sin_port);
  520         err = -EACCES;
  521         if (snum && snum < PROT_SOCK &&
  522             !ns_capable(net->user_ns, CAP_NET_BIND_SERVICE))
  523                 goto out;
  524 
  525         /*      We keep a pair of addresses. rcv_saddr is the one
  526          *      used by hash lookups, and saddr is used for transmit.
  527          *
  528          *      In the BSD API these are the same except where it
  529          *      would be illegal to use them (multicast/broadcast) in
  530          *      which case the sending device address is used.
  531          */
  532         lock_sock(sk);
  533 
  534         /* Check these errors (active socket, double bind). */
  535         err = -EINVAL;
  536         if (sk->sk_state != TCP_CLOSE || inet->inet_num)
  537                 goto out_release_sock;
  538 
  539         inet->inet_rcv_saddr = inet->inet_saddr = addr->sin_addr.s_addr;
  540         if (chk_addr_ret == RTN_MULTICAST || chk_addr_ret == RTN_BROADCAST)
  541                 inet->inet_saddr = 0;  /* Use device */
  542 
  543         /* Make sure we are allowed to bind here. */
  544         if (sk->sk_prot->get_port(sk, snum)) {
  545                 inet->inet_saddr = inet->inet_rcv_saddr = 0;
  546                 err = -EADDRINUSE;
  547                 goto out_release_sock;
  548         }
  549 
  550         if (inet->inet_rcv_saddr)
  551                 sk->sk_userlocks |= SOCK_BINDADDR_LOCK;
  552         if (snum)
  553                 sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
  554         inet->inet_sport = htons(inet->inet_num);
  555         inet->inet_daddr = 0;
  556         inet->inet_dport = 0;
  557         sk_dst_reset(sk);
  558         err = 0;
  559 out_release_sock:
  560         release_sock(sk);
  561 out:
  562         return err;
  563 }
  564 EXPORT_SYMBOL(inet_bind);
  565 
  566 int inet_dgram_connect(struct socket *sock, struct sockaddr *uaddr,
  567                        int addr_len, int flags)
  568 {
  569         struct sock *sk = sock->sk;
  570 
  571         if (addr_len < sizeof(uaddr->sa_family))
  572                 return -EINVAL;
  573         if (uaddr->sa_family == AF_UNSPEC)
  574                 return sk->sk_prot->disconnect(sk, flags);
  575 
  576         if (!inet_sk(sk)->inet_num && inet_autobind(sk))
  577                 return -EAGAIN;
  578         return sk->sk_prot->connect(sk, uaddr, addr_len);
  579 }
  580 EXPORT_SYMBOL(inet_dgram_connect);
  581 
  582 static long inet_wait_for_connect(struct sock *sk, long timeo, int writebias)
  583 {
  584         DEFINE_WAIT(wait);
  585 
  586         prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
  587         sk->sk_write_pending += writebias;
  588 
  589         /* Basic assumption: if someone sets sk->sk_err, he _must_
  590          * change state of the socket from TCP_SYN_*.
  591          * Connect() does not allow to get error notifications
  592          * without closing the socket.
  593          */
  594         while ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV)) {
  595                 release_sock(sk);
  596                 timeo = schedule_timeout(timeo);
  597                 lock_sock(sk);
  598                 if (signal_pending(current) || !timeo)
  599                         break;
  600                 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
  601         }
  602         finish_wait(sk_sleep(sk), &wait);
  603         sk->sk_write_pending -= writebias;
  604         return timeo;
  605 }
  606 
  607 /*
  608  *      Connect to a remote host. There is regrettably still a little
  609  *      TCP 'magic' in here.
  610  */
  611 int __inet_stream_connect(struct socket *sock, struct sockaddr *uaddr,
  612                           int addr_len, int flags)
  613 {
  614         struct sock *sk = sock->sk;
  615         int err;
  616         long timeo;
  617 
  618         if (addr_len < sizeof(uaddr->sa_family))
  619                 return -EINVAL;
  620 
  621         if (uaddr->sa_family == AF_UNSPEC) {
  622                 err = sk->sk_prot->disconnect(sk, flags);
  623                 sock->state = err ? SS_DISCONNECTING : SS_UNCONNECTED;
  624                 goto out;
  625         }
  626 
  627         switch (sock->state) {
  628         default:
  629                 err = -EINVAL;
  630                 goto out;
  631         case SS_CONNECTED:
  632                 err = -EISCONN;
  633                 goto out;
  634         case SS_CONNECTING:
  635                 err = -EALREADY;
  636                 /* Fall out of switch with err, set for this state */
  637                 break;
  638         case SS_UNCONNECTED:
  639                 err = -EISCONN;
  640                 if (sk->sk_state != TCP_CLOSE)
  641                         goto out;
  642 
  643                 err = sk->sk_prot->connect(sk, uaddr, addr_len);
  644                 if (err < 0)
  645                         goto out;
  646 
  647                 sock->state = SS_CONNECTING;
  648 
  649                 /* Just entered SS_CONNECTING state; the only
  650                  * difference is that return value in non-blocking
  651                  * case is EINPROGRESS, rather than EALREADY.
  652                  */
  653                 err = -EINPROGRESS;
  654                 break;
  655         }
  656 
  657         timeo = sock_sndtimeo(sk, flags & O_NONBLOCK);
  658 
  659         if ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV)) {
  660                 int writebias = (sk->sk_protocol == IPPROTO_TCP) &&
  661                                 tcp_sk(sk)->fastopen_req &&
  662                                 tcp_sk(sk)->fastopen_req->data ? 1 : 0;
  663 
  664                 /* Error code is set above */
  665                 if (!timeo || !inet_wait_for_connect(sk, timeo, writebias))
  666                         goto out;
  667 
  668                 err = sock_intr_errno(timeo);
  669                 if (signal_pending(current))
  670                         goto out;
  671         }
  672 
  673         /* Connection was closed by RST, timeout, ICMP error
  674          * or another process disconnected us.
  675          */
  676         if (sk->sk_state == TCP_CLOSE)
  677                 goto sock_error;
  678 
  679         /* sk->sk_err may be not zero now, if RECVERR was ordered by user
  680          * and error was received after socket entered established state.
  681          * Hence, it is handled normally after connect() return successfully.
  682          */
  683 
  684         sock->state = SS_CONNECTED;
  685         err = 0;
  686 out:
  687         return err;
  688 
  689 sock_error:
  690         err = sock_error(sk) ? : -ECONNABORTED;
  691         sock->state = SS_UNCONNECTED;
  692         if (sk->sk_prot->disconnect(sk, flags))
  693                 sock->state = SS_DISCONNECTING;
  694         goto out;
  695 }
  696 EXPORT_SYMBOL(__inet_stream_connect);
  697 
  698 int inet_stream_connect(struct socket *sock, struct sockaddr *uaddr,
  699                         int addr_len, int flags)
  700 {
  701         int err;
  702 
  703         lock_sock(sock->sk);
  704         err = __inet_stream_connect(sock, uaddr, addr_len, flags);
  705         release_sock(sock->sk);
  706         return err;
  707 }
  708 EXPORT_SYMBOL(inet_stream_connect);
  709 
  710 /*
  711  *      Accept a pending connection. The TCP layer now gives BSD semantics.
  712  */
  713 
  714 int inet_accept(struct socket *sock, struct socket *newsock, int flags)
  715 {
  716         struct sock *sk1 = sock->sk;
  717         int err = -EINVAL;
  718         struct sock *sk2 = sk1->sk_prot->accept(sk1, flags, &err);
  719 
  720         if (!sk2)
  721                 goto do_err;
  722 
  723         lock_sock(sk2);
  724 
  725         sock_rps_record_flow(sk2);
  726         WARN_ON(!((1 << sk2->sk_state) &
  727                   (TCPF_ESTABLISHED | TCPF_SYN_RECV |
  728                   TCPF_CLOSE_WAIT | TCPF_CLOSE)));
  729 
  730         sock_graft(sk2, newsock);
  731 
  732         newsock->state = SS_CONNECTED;
  733         err = 0;
  734         release_sock(sk2);
  735 do_err:
  736         return err;
  737 }
  738 EXPORT_SYMBOL(inet_accept);
  739 
  740 
  741 /*
  742  *      This does both peername and sockname.
  743  */
  744 int inet_getname(struct socket *sock, struct sockaddr *uaddr,
  745                         int *uaddr_len, int peer)
  746 {
  747         struct sock *sk         = sock->sk;
  748         struct inet_sock *inet  = inet_sk(sk);
  749         DECLARE_SOCKADDR(struct sockaddr_in *, sin, uaddr);
  750 
  751         sin->sin_family = AF_INET;
  752         if (peer) {
  753                 if (!inet->inet_dport ||
  754                     (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) &&
  755                      peer == 1))
  756                         return -ENOTCONN;
  757                 sin->sin_port = inet->inet_dport;
  758                 sin->sin_addr.s_addr = inet->inet_daddr;
  759         } else {
  760                 __be32 addr = inet->inet_rcv_saddr;
  761                 if (!addr)
  762                         addr = inet->inet_saddr;
  763                 sin->sin_port = inet->inet_sport;
  764                 sin->sin_addr.s_addr = addr;
  765         }
  766         memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
  767         *uaddr_len = sizeof(*sin);
  768         return 0;
  769 }
  770 EXPORT_SYMBOL(inet_getname);
  771 
  772 int inet_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg,
  773                  size_t size)
  774 {
  775         struct sock *sk = sock->sk;
  776 
  777         sock_rps_record_flow(sk);
  778 
  779         /* We may need to bind the socket. */
  780         if (!inet_sk(sk)->inet_num && !sk->sk_prot->no_autobind &&
  781             inet_autobind(sk))
  782                 return -EAGAIN;
  783 
  784         return sk->sk_prot->sendmsg(iocb, sk, msg, size);
  785 }
  786 EXPORT_SYMBOL(inet_sendmsg);
  787 
  788 ssize_t inet_sendpage(struct socket *sock, struct page *page, int offset,
  789                       size_t size, int flags)
  790 {
  791         struct sock *sk = sock->sk;
  792 
  793         sock_rps_record_flow(sk);
  794 
  795         /* We may need to bind the socket. */
  796         if (!inet_sk(sk)->inet_num && !sk->sk_prot->no_autobind &&
  797             inet_autobind(sk))
  798                 return -EAGAIN;
  799 
  800         if (sk->sk_prot->sendpage)
  801                 return sk->sk_prot->sendpage(sk, page, offset, size, flags);
  802         return sock_no_sendpage(sock, page, offset, size, flags);
  803 }
  804 EXPORT_SYMBOL(inet_sendpage);
  805 
  806 int inet_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg,
  807                  size_t size, int flags)
  808 {
  809         struct sock *sk = sock->sk;
  810         int addr_len = 0;
  811         int err;
  812 
  813         sock_rps_record_flow(sk);
  814 
  815         err = sk->sk_prot->recvmsg(iocb, sk, msg, size, flags & MSG_DONTWAIT,
  816                                    flags & ~MSG_DONTWAIT, &addr_len);
  817         if (err >= 0)
  818                 msg->msg_namelen = addr_len;
  819         return err;
  820 }
  821 EXPORT_SYMBOL(inet_recvmsg);
  822 
  823 int inet_shutdown(struct socket *sock, int how)
  824 {
  825         struct sock *sk = sock->sk;
  826         int err = 0;
  827 
  828         /* This should really check to make sure
  829          * the socket is a TCP socket. (WHY AC...)
  830          */
  831         how++; /* maps 0->1 has the advantage of making bit 1 rcvs and
  832                        1->2 bit 2 snds.
  833                        2->3 */
  834         if ((how & ~SHUTDOWN_MASK) || !how)     /* MAXINT->0 */
  835                 return -EINVAL;
  836 
  837         lock_sock(sk);
  838         if (sock->state == SS_CONNECTING) {
  839                 if ((1 << sk->sk_state) &
  840                     (TCPF_SYN_SENT | TCPF_SYN_RECV | TCPF_CLOSE))
  841                         sock->state = SS_DISCONNECTING;
  842                 else
  843                         sock->state = SS_CONNECTED;
  844         }
  845 
  846         switch (sk->sk_state) {
  847         case TCP_CLOSE:
  848                 err = -ENOTCONN;
  849                 /* Hack to wake up other listeners, who can poll for
  850                    POLLHUP, even on eg. unconnected UDP sockets -- RR */
  851         default:
  852                 sk->sk_shutdown |= how;
  853                 if (sk->sk_prot->shutdown)
  854                         sk->sk_prot->shutdown(sk, how);
  855                 break;
  856 
  857         /* Remaining two branches are temporary solution for missing
  858          * close() in multithreaded environment. It is _not_ a good idea,
  859          * but we have no choice until close() is repaired at VFS level.
  860          */
  861         case TCP_LISTEN:
  862                 if (!(how & RCV_SHUTDOWN))
  863                         break;
  864                 /* Fall through */
  865         case TCP_SYN_SENT:
  866                 err = sk->sk_prot->disconnect(sk, O_NONBLOCK);
  867                 sock->state = err ? SS_DISCONNECTING : SS_UNCONNECTED;
  868                 break;
  869         }
  870 
  871         /* Wake up anyone sleeping in poll. */
  872         sk->sk_state_change(sk);
  873         release_sock(sk);
  874         return err;
  875 }
  876 EXPORT_SYMBOL(inet_shutdown);
  877 
  878 /*
  879  *      ioctl() calls you can issue on an INET socket. Most of these are
  880  *      device configuration and stuff and very rarely used. Some ioctls
  881  *      pass on to the socket itself.
  882  *
  883  *      NOTE: I like the idea of a module for the config stuff. ie ifconfig
  884  *      loads the devconfigure module does its configuring and unloads it.
  885  *      There's a good 20K of config code hanging around the kernel.
  886  */
  887 
  888 int inet_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
  889 {
  890         struct sock *sk = sock->sk;
  891         int err = 0;
  892         struct net *net = sock_net(sk);
  893 
  894         switch (cmd) {
  895         case SIOCGSTAMP:
  896                 err = sock_get_timestamp(sk, (struct timeval __user *)arg);
  897                 break;
  898         case SIOCGSTAMPNS:
  899                 err = sock_get_timestampns(sk, (struct timespec __user *)arg);
  900                 break;
  901         case SIOCADDRT:
  902         case SIOCDELRT:
  903         case SIOCRTMSG:
  904                 err = ip_rt_ioctl(net, cmd, (void __user *)arg);
  905                 break;
  906         case SIOCDARP:
  907         case SIOCGARP:
  908         case SIOCSARP:
  909                 err = arp_ioctl(net, cmd, (void __user *)arg);
  910                 break;
  911         case SIOCGIFADDR:
  912         case SIOCSIFADDR:
  913         case SIOCGIFBRDADDR:
  914         case SIOCSIFBRDADDR:
  915         case SIOCGIFNETMASK:
  916         case SIOCSIFNETMASK:
  917         case SIOCGIFDSTADDR:
  918         case SIOCSIFDSTADDR:
  919         case SIOCSIFPFLAGS:
  920         case SIOCGIFPFLAGS:
  921         case SIOCSIFFLAGS:
  922                 err = devinet_ioctl(net, cmd, (void __user *)arg);
  923                 break;
  924         default:
  925                 if (sk->sk_prot->ioctl)
  926                         err = sk->sk_prot->ioctl(sk, cmd, arg);
  927                 else
  928                         err = -ENOIOCTLCMD;
  929                 break;
  930         }
  931         return err;
  932 }
  933 EXPORT_SYMBOL(inet_ioctl);
  934 
  935 #ifdef CONFIG_COMPAT
  936 static int inet_compat_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
  937 {
  938         struct sock *sk = sock->sk;
  939         int err = -ENOIOCTLCMD;
  940 
  941         if (sk->sk_prot->compat_ioctl)
  942                 err = sk->sk_prot->compat_ioctl(sk, cmd, arg);
  943 
  944         return err;
  945 }
  946 #endif
  947 
  948 const struct proto_ops inet_stream_ops = {
  949         .family            = PF_INET,
  950         .owner             = THIS_MODULE,
  951         .release           = inet_release,
  952         .bind              = inet_bind,
  953         .connect           = inet_stream_connect,
  954         .socketpair        = sock_no_socketpair,
  955         .accept            = inet_accept,
  956         .getname           = inet_getname,
  957         .poll              = tcp_poll,
  958         .ioctl             = inet_ioctl,
  959         .listen            = inet_listen,
  960         .shutdown          = inet_shutdown,
  961         .setsockopt        = sock_common_setsockopt,
  962         .getsockopt        = sock_common_getsockopt,
  963         .sendmsg           = inet_sendmsg,
  964         .recvmsg           = inet_recvmsg,
  965         .mmap              = sock_no_mmap,
  966         .sendpage          = inet_sendpage,
  967         .splice_read       = tcp_splice_read,
  968 #ifdef CONFIG_COMPAT
  969         .compat_setsockopt = compat_sock_common_setsockopt,
  970         .compat_getsockopt = compat_sock_common_getsockopt,
  971         .compat_ioctl      = inet_compat_ioctl,
  972 #endif
  973 };
  974 EXPORT_SYMBOL(inet_stream_ops);
  975 
  976 const struct proto_ops inet_dgram_ops = {
  977         .family            = PF_INET,
  978         .owner             = THIS_MODULE,
  979         .release           = inet_release,
  980         .bind              = inet_bind,
  981         .connect           = inet_dgram_connect,
  982         .socketpair        = sock_no_socketpair,
  983         .accept            = sock_no_accept,
  984         .getname           = inet_getname,
  985         .poll              = udp_poll,
  986         .ioctl             = inet_ioctl,
  987         .listen            = sock_no_listen,
  988         .shutdown          = inet_shutdown,
  989         .setsockopt        = sock_common_setsockopt,
  990         .getsockopt        = sock_common_getsockopt,
  991         .sendmsg           = inet_sendmsg,
  992         .recvmsg           = inet_recvmsg,
  993         .mmap              = sock_no_mmap,
  994         .sendpage          = inet_sendpage,
  995 #ifdef CONFIG_COMPAT
  996         .compat_setsockopt = compat_sock_common_setsockopt,
  997         .compat_getsockopt = compat_sock_common_getsockopt,
  998         .compat_ioctl      = inet_compat_ioctl,
  999 #endif
 1000 };
 1001 EXPORT_SYMBOL(inet_dgram_ops);
 1002 
 1003 /*
 1004  * For SOCK_RAW sockets; should be the same as inet_dgram_ops but without
 1005  * udp_poll
 1006  */
 1007 static const struct proto_ops inet_sockraw_ops = {
 1008         .family            = PF_INET,
 1009         .owner             = THIS_MODULE,
 1010         .release           = inet_release,
 1011         .bind              = inet_bind,
 1012         .connect           = inet_dgram_connect,
 1013         .socketpair        = sock_no_socketpair,
 1014         .accept            = sock_no_accept,
 1015         .getname           = inet_getname,
 1016         .poll              = datagram_poll,
 1017         .ioctl             = inet_ioctl,
 1018         .listen            = sock_no_listen,
 1019         .shutdown          = inet_shutdown,
 1020         .setsockopt        = sock_common_setsockopt,
 1021         .getsockopt        = sock_common_getsockopt,
 1022         .sendmsg           = inet_sendmsg,
 1023         .recvmsg           = inet_recvmsg,
 1024         .mmap              = sock_no_mmap,
 1025         .sendpage          = inet_sendpage,
 1026 #ifdef CONFIG_COMPAT
 1027         .compat_setsockopt = compat_sock_common_setsockopt,
 1028         .compat_getsockopt = compat_sock_common_getsockopt,
 1029         .compat_ioctl      = inet_compat_ioctl,
 1030 #endif
 1031 };
 1032 
 1033 static const struct net_proto_family inet_family_ops = {
 1034         .family = PF_INET,
 1035         .create = inet_create,
 1036         .owner  = THIS_MODULE,
 1037 };
 1038 
 1039 /* Upon startup we insert all the elements in inetsw_array[] into
 1040  * the linked list inetsw.
 1041  */
 1042 static struct inet_protosw inetsw_array[] =
 1043 {
 1044         {
 1045                 .type =       SOCK_STREAM,
 1046                 .protocol =   IPPROTO_TCP,
 1047                 .prot =       &tcp_prot,
 1048                 .ops =        &inet_stream_ops,
 1049                 .no_check =   0,
 1050                 .flags =      INET_PROTOSW_PERMANENT |
 1051                               INET_PROTOSW_ICSK,
 1052         },
 1053 
 1054         {
 1055                 .type =       SOCK_DGRAM,
 1056                 .protocol =   IPPROTO_UDP,
 1057                 .prot =       &udp_prot,
 1058                 .ops =        &inet_dgram_ops,
 1059                 .no_check =   UDP_CSUM_DEFAULT,
 1060                 .flags =      INET_PROTOSW_PERMANENT,
 1061        },
 1062 
 1063        {
 1064                 .type =       SOCK_DGRAM,
 1065                 .protocol =   IPPROTO_ICMP,
 1066                 .prot =       &ping_prot,
 1067                 .ops =        &inet_dgram_ops,
 1068                 .no_check =   UDP_CSUM_DEFAULT,
 1069                 .flags =      INET_PROTOSW_REUSE,
 1070        },
 1071 
 1072        {
 1073                .type =       SOCK_RAW,
 1074                .protocol =   IPPROTO_IP,        /* wild card */
 1075                .prot =       &raw_prot,
 1076                .ops =        &inet_sockraw_ops,
 1077                .no_check =   UDP_CSUM_DEFAULT,
 1078                .flags =      INET_PROTOSW_REUSE,
 1079        }
 1080 };
 1081 
 1082 #define INETSW_ARRAY_LEN ARRAY_SIZE(inetsw_array)
 1083 
 1084 void inet_register_protosw(struct inet_protosw *p)
 1085 {
 1086         struct list_head *lh;
 1087         struct inet_protosw *answer;
 1088         int protocol = p->protocol;
 1089         struct list_head *last_perm;
 1090 
 1091         spin_lock_bh(&inetsw_lock);
 1092 
 1093         if (p->type >= SOCK_MAX)
 1094                 goto out_illegal;
 1095 
 1096         /* If we are trying to override a permanent protocol, bail. */
 1097         answer = NULL;
 1098         last_perm = &inetsw[p->type];
 1099         list_for_each(lh, &inetsw[p->type]) {
 1100                 answer = list_entry(lh, struct inet_protosw, list);
 1101 
 1102                 /* Check only the non-wild match. */
 1103                 if (INET_PROTOSW_PERMANENT & answer->flags) {
 1104                         if (protocol == answer->protocol)
 1105                                 break;
 1106                         last_perm = lh;
 1107                 }
 1108 
 1109                 answer = NULL;
 1110         }
 1111         if (answer)
 1112                 goto out_permanent;
 1113 
 1114         /* Add the new entry after the last permanent entry if any, so that
 1115          * the new entry does not override a permanent entry when matched with
 1116          * a wild-card protocol. But it is allowed to override any existing
 1117          * non-permanent entry.  This means that when we remove this entry, the
 1118          * system automatically returns to the old behavior.
 1119          */
 1120         list_add_rcu(&p->list, last_perm);
 1121 out:
 1122         spin_unlock_bh(&inetsw_lock);
 1123 
 1124         return;
 1125 
 1126 out_permanent:
 1127         pr_err("Attempt to override permanent protocol %d\n", protocol);
 1128         goto out;
 1129 
 1130 out_illegal:
 1131         pr_err("Ignoring attempt to register invalid socket type %d\n",
 1132                p->type);
 1133         goto out;
 1134 }
 1135 EXPORT_SYMBOL(inet_register_protosw);
 1136 
 1137 void inet_unregister_protosw(struct inet_protosw *p)
 1138 {
 1139         if (INET_PROTOSW_PERMANENT & p->flags) {
 1140                 pr_err("Attempt to unregister permanent protocol %d\n",
 1141                        p->protocol);
 1142         } else {
 1143                 spin_lock_bh(&inetsw_lock);
 1144                 list_del_rcu(&p->list);
 1145                 spin_unlock_bh(&inetsw_lock);
 1146 
 1147                 synchronize_net();
 1148         }
 1149 }
 1150 EXPORT_SYMBOL(inet_unregister_protosw);
 1151 
 1152 /*
 1153  *      Shall we try to damage output packets if routing dev changes?
 1154  */
 1155 
 1156 int sysctl_ip_dynaddr __read_mostly;
 1157 
 1158 static int inet_sk_reselect_saddr(struct sock *sk)
 1159 {
 1160         struct inet_sock *inet = inet_sk(sk);
 1161         __be32 old_saddr = inet->inet_saddr;
 1162         __be32 daddr = inet->inet_daddr;
 1163         struct flowi4 *fl4;
 1164         struct rtable *rt;
 1165         __be32 new_saddr;
 1166         struct ip_options_rcu *inet_opt;
 1167 
 1168         inet_opt = rcu_dereference_protected(inet->inet_opt,
 1169                                              sock_owned_by_user(sk));
 1170         if (inet_opt && inet_opt->opt.srr)
 1171                 daddr = inet_opt->opt.faddr;
 1172 
 1173         /* Query new route. */
 1174         fl4 = &inet->cork.fl.u.ip4;
 1175         rt = ip_route_connect(fl4, daddr, 0, RT_CONN_FLAGS(sk),
 1176                               sk->sk_bound_dev_if, sk->sk_protocol,
 1177                               inet->inet_sport, inet->inet_dport, sk, false);
 1178         if (IS_ERR(rt))
 1179                 return PTR_ERR(rt);
 1180 
 1181         sk_setup_caps(sk, &rt->dst);
 1182 
 1183         new_saddr = fl4->saddr;
 1184 
 1185         if (new_saddr == old_saddr)
 1186                 return 0;
 1187 
 1188         if (sysctl_ip_dynaddr > 1) {
 1189                 pr_info("%s(): shifting inet->saddr from %pI4 to %pI4\n",
 1190                         __func__, &old_saddr, &new_saddr);
 1191         }
 1192 
 1193         inet->inet_saddr = inet->inet_rcv_saddr = new_saddr;
 1194 
 1195         /*
 1196          * XXX The only one ugly spot where we need to
 1197          * XXX really change the sockets identity after
 1198          * XXX it has entered the hashes. -DaveM
 1199          *
 1200          * Besides that, it does not check for connection
 1201          * uniqueness. Wait for troubles.
 1202          */
 1203         __sk_prot_rehash(sk);
 1204         return 0;
 1205 }
 1206 
 1207 int inet_sk_rebuild_header(struct sock *sk)
 1208 {
 1209         struct inet_sock *inet = inet_sk(sk);
 1210         struct rtable *rt = (struct rtable *)__sk_dst_check(sk, 0);
 1211         __be32 daddr;
 1212         struct ip_options_rcu *inet_opt;
 1213         struct flowi4 *fl4;
 1214         int err;
 1215 
 1216         /* Route is OK, nothing to do. */
 1217         if (rt)
 1218                 return 0;
 1219 
 1220         /* Reroute. */
 1221         rcu_read_lock();
 1222         inet_opt = rcu_dereference(inet->inet_opt);
 1223         daddr = inet->inet_daddr;
 1224         if (inet_opt && inet_opt->opt.srr)
 1225                 daddr = inet_opt->opt.faddr;
 1226         rcu_read_unlock();
 1227         fl4 = &inet->cork.fl.u.ip4;
 1228         rt = ip_route_output_ports(sock_net(sk), fl4, sk, daddr, inet->inet_saddr,
 1229                                    inet->inet_dport, inet->inet_sport,
 1230                                    sk->sk_protocol, RT_CONN_FLAGS(sk),
 1231                                    sk->sk_bound_dev_if);
 1232         if (!IS_ERR(rt)) {
 1233                 err = 0;
 1234                 sk_setup_caps(sk, &rt->dst);
 1235         } else {
 1236                 err = PTR_ERR(rt);
 1237 
 1238                 /* Routing failed... */
 1239                 sk->sk_route_caps = 0;
 1240                 /*
 1241                  * Other protocols have to map its equivalent state to TCP_SYN_SENT.
 1242                  * DCCP maps its DCCP_REQUESTING state to TCP_SYN_SENT. -acme
 1243                  */
 1244                 if (!sysctl_ip_dynaddr ||
 1245                     sk->sk_state != TCP_SYN_SENT ||
 1246                     (sk->sk_userlocks & SOCK_BINDADDR_LOCK) ||
 1247                     (err = inet_sk_reselect_saddr(sk)) != 0)
 1248                         sk->sk_err_soft = -err;
 1249         }
 1250 
 1251         return err;
 1252 }
 1253 EXPORT_SYMBOL(inet_sk_rebuild_header);
 1254 
 1255 static int inet_gso_send_check(struct sk_buff *skb)
 1256 {
 1257         const struct net_offload *ops;
 1258         const struct iphdr *iph;
 1259         int proto;
 1260         int ihl;
 1261         int err = -EINVAL;
 1262 
 1263         if (unlikely(!pskb_may_pull(skb, sizeof(*iph))))
 1264                 goto out;
 1265 
 1266         iph = ip_hdr(skb);
 1267         ihl = iph->ihl * 4;
 1268         if (ihl < sizeof(*iph))
 1269                 goto out;
 1270 
 1271         if (unlikely(!pskb_may_pull(skb, ihl)))
 1272                 goto out;
 1273 
 1274         __skb_pull(skb, ihl);
 1275         skb_reset_transport_header(skb);
 1276         iph = ip_hdr(skb);
 1277         proto = iph->protocol;
 1278         err = -EPROTONOSUPPORT;
 1279 
 1280         rcu_read_lock();
 1281         ops = rcu_dereference(inet_offloads[proto]);
 1282         if (likely(ops && ops->callbacks.gso_send_check))
 1283                 err = ops->callbacks.gso_send_check(skb);
 1284         rcu_read_unlock();
 1285 
 1286 out:
 1287         return err;
 1288 }
 1289 
 1290 static struct sk_buff *inet_gso_segment(struct sk_buff *skb,
 1291         netdev_features_t features)
 1292 {
 1293         struct sk_buff *segs = ERR_PTR(-EINVAL);
 1294         const struct net_offload *ops;
 1295         struct iphdr *iph;
 1296         int proto;
 1297         int ihl;
 1298         int id;
 1299         unsigned int offset = 0;
 1300 
 1301         if (!(features & NETIF_F_V4_CSUM))
 1302                 features &= ~NETIF_F_SG;
 1303 
 1304         if (unlikely(skb_shinfo(skb)->gso_type &
 1305                      ~(SKB_GSO_TCPV4 |
 1306                        SKB_GSO_UDP |
 1307                        SKB_GSO_DODGY |
 1308                        SKB_GSO_TCP_ECN |
 1309                        0)))
 1310                 goto out;
 1311 
 1312         if (unlikely(!pskb_may_pull(skb, sizeof(*iph))))
 1313                 goto out;
 1314 
 1315         iph = ip_hdr(skb);
 1316         ihl = iph->ihl * 4;
 1317         if (ihl < sizeof(*iph))
 1318                 goto out;
 1319 
 1320         if (unlikely(!pskb_may_pull(skb, ihl)))
 1321                 goto out;
 1322 
 1323         __skb_pull(skb, ihl);
 1324         skb_reset_transport_header(skb);
 1325         iph = ip_hdr(skb);
 1326         id = ntohs(iph->id);
 1327         proto = iph->protocol;
 1328         segs = ERR_PTR(-EPROTONOSUPPORT);
 1329 
 1330         rcu_read_lock();
 1331         ops = rcu_dereference(inet_offloads[proto]);
 1332         if (likely(ops && ops->callbacks.gso_segment))
 1333                 segs = ops->callbacks.gso_segment(skb, features);
 1334         rcu_read_unlock();
 1335 
 1336         if (!segs || IS_ERR(segs))
 1337                 goto out;
 1338 
 1339         skb = segs;
 1340         do {
 1341                 iph = ip_hdr(skb);
 1342                 if (proto == IPPROTO_UDP) {
 1343                         iph->id = htons(id);
 1344                         iph->frag_off = htons(offset >> 3);
 1345                         if (skb->next != NULL)
 1346                                 iph->frag_off |= htons(IP_MF);
 1347                         offset += (skb->len - skb->mac_len - iph->ihl * 4);
 1348                 } else
 1349                         iph->id = htons(id++);
 1350                 iph->tot_len = htons(skb->len - skb->mac_len);
 1351                 iph->check = 0;
 1352                 iph->check = ip_fast_csum(skb_network_header(skb), iph->ihl);
 1353         } while ((skb = skb->next));
 1354 
 1355 out:
 1356         return segs;
 1357 }
 1358 
 1359 static struct sk_buff **inet_gro_receive(struct sk_buff **head,
 1360                                          struct sk_buff *skb)
 1361 {
 1362         const struct net_offload *ops;
 1363         struct sk_buff **pp = NULL;
 1364         struct sk_buff *p;
 1365         const struct iphdr *iph;
 1366         unsigned int hlen;
 1367         unsigned int off;
 1368         unsigned int id;
 1369         int flush = 1;
 1370         int proto;
 1371 
 1372         off = skb_gro_offset(skb);
 1373         hlen = off + sizeof(*iph);
 1374         iph = skb_gro_header_fast(skb, off);
 1375         if (skb_gro_header_hard(skb, hlen)) {
 1376                 iph = skb_gro_header_slow(skb, hlen, off);
 1377                 if (unlikely(!iph))
 1378                         goto out;
 1379         }
 1380 
 1381         proto = iph->protocol;
 1382 
 1383         rcu_read_lock();
 1384         ops = rcu_dereference(inet_offloads[proto]);
 1385         if (!ops || !ops->callbacks.gro_receive)
 1386                 goto out_unlock;
 1387 
 1388         if (*(u8 *)iph != 0x45)
 1389                 goto out_unlock;
 1390 
 1391         if (unlikely(ip_fast_csum((u8 *)iph, 5)))
 1392                 goto out_unlock;
 1393 
 1394         id = ntohl(*(__be32 *)&iph->id);
 1395         flush = (u16)((ntohl(*(__be32 *)iph) ^ skb_gro_len(skb)) | (id ^ IP_DF));
 1396         id >>= 16;
 1397 
 1398         for (p = *head; p; p = p->next) {
 1399                 struct iphdr *iph2;
 1400 
 1401                 if (!NAPI_GRO_CB(p)->same_flow)
 1402                         continue;
 1403 
 1404                 iph2 = ip_hdr(p);
 1405 
 1406                 if ((iph->protocol ^ iph2->protocol) |
 1407                     ((__force u32)iph->saddr ^ (__force u32)iph2->saddr) |
 1408                     ((__force u32)iph->daddr ^ (__force u32)iph2->daddr)) {
 1409                         NAPI_GRO_CB(p)->same_flow = 0;
 1410                         continue;
 1411                 }
 1412 
 1413                 /* All fields must match except length and checksum. */
 1414                 NAPI_GRO_CB(p)->flush |=
 1415                         (iph->ttl ^ iph2->ttl) |
 1416                         (iph->tos ^ iph2->tos) |
 1417                         ((u16)(ntohs(iph2->id) + NAPI_GRO_CB(p)->count) ^ id);
 1418 
 1419                 NAPI_GRO_CB(p)->flush |= flush;
 1420         }
 1421 
 1422         NAPI_GRO_CB(skb)->flush |= flush;
 1423         skb_gro_pull(skb, sizeof(*iph));
 1424         skb_set_transport_header(skb, skb_gro_offset(skb));
 1425 
 1426         pp = ops->callbacks.gro_receive(head, skb);
 1427 
 1428 out_unlock:
 1429         rcu_read_unlock();
 1430 
 1431 out:
 1432         NAPI_GRO_CB(skb)->flush |= flush;
 1433 
 1434         return pp;
 1435 }
 1436 
 1437 static int inet_gro_complete(struct sk_buff *skb)
 1438 {
 1439         __be16 newlen = htons(skb->len - skb_network_offset(skb));
 1440         struct iphdr *iph = ip_hdr(skb);
 1441         const struct net_offload *ops;
 1442         int proto = iph->protocol;
 1443         int err = -ENOSYS;
 1444 
 1445         csum_replace2(&iph->check, iph->tot_len, newlen);
 1446         iph->tot_len = newlen;
 1447 
 1448         rcu_read_lock();
 1449         ops = rcu_dereference(inet_offloads[proto]);
 1450         if (WARN_ON(!ops || !ops->callbacks.gro_complete))
 1451                 goto out_unlock;
 1452 
 1453         err = ops->callbacks.gro_complete(skb);
 1454 
 1455 out_unlock:
 1456         rcu_read_unlock();
 1457 
 1458         return err;
 1459 }
 1460 
 1461 int inet_ctl_sock_create(struct sock **sk, unsigned short family,
 1462                          unsigned short type, unsigned char protocol,
 1463                          struct net *net)
 1464 {
 1465         struct socket *sock;
 1466         int rc = sock_create_kern(family, type, protocol, &sock);
 1467 
 1468         if (rc == 0) {
 1469                 *sk = sock->sk;
 1470                 (*sk)->sk_allocation = GFP_ATOMIC;
 1471                 /*
 1472                  * Unhash it so that IP input processing does not even see it,
 1473                  * we do not wish this socket to see incoming packets.
 1474                  */
 1475                 (*sk)->sk_prot->unhash(*sk);
 1476 
 1477                 sk_change_net(*sk, net);
 1478         }
 1479         return rc;
 1480 }
 1481 EXPORT_SYMBOL_GPL(inet_ctl_sock_create);
 1482 
 1483 unsigned long snmp_fold_field(void __percpu *mib[], int offt)
 1484 {
 1485         unsigned long res = 0;
 1486         int i, j;
 1487 
 1488         for_each_possible_cpu(i) {
 1489                 for (j = 0; j < SNMP_ARRAY_SZ; j++)
 1490                         res += *(((unsigned long *) per_cpu_ptr(mib[j], i)) + offt);
 1491         }
 1492         return res;
 1493 }
 1494 EXPORT_SYMBOL_GPL(snmp_fold_field);
 1495 
 1496 #if BITS_PER_LONG==32
 1497 
 1498 u64 snmp_fold_field64(void __percpu *mib[], int offt, size_t syncp_offset)
 1499 {
 1500         u64 res = 0;
 1501         int cpu;
 1502 
 1503         for_each_possible_cpu(cpu) {
 1504                 void *bhptr;
 1505                 struct u64_stats_sync *syncp;
 1506                 u64 v;
 1507                 unsigned int start;
 1508 
 1509                 bhptr = per_cpu_ptr(mib[0], cpu);
 1510                 syncp = (struct u64_stats_sync *)(bhptr + syncp_offset);
 1511                 do {
 1512                         start = u64_stats_fetch_begin_bh(syncp);
 1513                         v = *(((u64 *) bhptr) + offt);
 1514                 } while (u64_stats_fetch_retry_bh(syncp, start));
 1515 
 1516                 res += v;
 1517         }
 1518         return res;
 1519 }
 1520 EXPORT_SYMBOL_GPL(snmp_fold_field64);
 1521 #endif
 1522 
 1523 int snmp_mib_init(void __percpu *ptr[2], size_t mibsize, size_t align)
 1524 {
 1525         BUG_ON(ptr == NULL);
 1526         ptr[0] = __alloc_percpu(mibsize, align);
 1527         if (!ptr[0])
 1528                 return -ENOMEM;
 1529 #if SNMP_ARRAY_SZ == 2
 1530         ptr[1] = __alloc_percpu(mibsize, align);
 1531         if (!ptr[1]) {
 1532                 free_percpu(ptr[0]);
 1533                 ptr[0] = NULL;
 1534                 return -ENOMEM;
 1535         }
 1536 #endif
 1537         return 0;
 1538 }
 1539 EXPORT_SYMBOL_GPL(snmp_mib_init);
 1540 
 1541 void snmp_mib_free(void __percpu *ptr[SNMP_ARRAY_SZ])
 1542 {
 1543         int i;
 1544 
 1545         BUG_ON(ptr == NULL);
 1546         for (i = 0; i < SNMP_ARRAY_SZ; i++) {
 1547                 free_percpu(ptr[i]);
 1548                 ptr[i] = NULL;
 1549         }
 1550 }
 1551 EXPORT_SYMBOL_GPL(snmp_mib_free);
 1552 
 1553 #ifdef CONFIG_IP_MULTICAST
 1554 static const struct net_protocol igmp_protocol = {
 1555         .handler =      igmp_rcv,
 1556         .netns_ok =     1,
 1557 };
 1558 #endif
 1559 
 1560 static const struct net_protocol tcp_protocol = {
 1561         .early_demux    =       tcp_v4_early_demux,
 1562         .handler        =       tcp_v4_rcv,
 1563         .err_handler    =       tcp_v4_err,
 1564         .no_policy      =       1,
 1565         .netns_ok       =       1,
 1566 };
 1567 
 1568 static const struct net_offload tcp_offload = {
 1569         .callbacks = {
 1570                 .gso_send_check =       tcp_v4_gso_send_check,
 1571                 .gso_segment    =       tcp_tso_segment,
 1572                 .gro_receive    =       tcp4_gro_receive,
 1573                 .gro_complete   =       tcp4_gro_complete,
 1574         },
 1575 };
 1576 
 1577 static const struct net_protocol udp_protocol = {
 1578         .handler =      udp_rcv,
 1579         .err_handler =  udp_err,
 1580         .no_policy =    1,
 1581         .netns_ok =     1,
 1582 };
 1583 
 1584 static const struct net_offload udp_offload = {
 1585         .callbacks = {
 1586                 .gso_send_check = udp4_ufo_send_check,
 1587                 .gso_segment = udp4_ufo_fragment,
 1588         },
 1589 };
 1590 
 1591 static const struct net_protocol icmp_protocol = {
 1592         .handler =      icmp_rcv,
 1593         .err_handler =  ping_err,
 1594         .no_policy =    1,
 1595         .netns_ok =     1,
 1596 };
 1597 
 1598 static __net_init int ipv4_mib_init_net(struct net *net)
 1599 {
 1600         if (snmp_mib_init((void __percpu **)net->mib.tcp_statistics,
 1601                           sizeof(struct tcp_mib),
 1602                           __alignof__(struct tcp_mib)) < 0)
 1603                 goto err_tcp_mib;
 1604         if (snmp_mib_init((void __percpu **)net->mib.ip_statistics,
 1605                           sizeof(struct ipstats_mib),
 1606                           __alignof__(struct ipstats_mib)) < 0)
 1607                 goto err_ip_mib;
 1608         if (snmp_mib_init((void __percpu **)net->mib.net_statistics,
 1609                           sizeof(struct linux_mib),
 1610                           __alignof__(struct linux_mib)) < 0)
 1611                 goto err_net_mib;
 1612         if (snmp_mib_init((void __percpu **)net->mib.udp_statistics,
 1613                           sizeof(struct udp_mib),
 1614                           __alignof__(struct udp_mib)) < 0)
 1615                 goto err_udp_mib;
 1616         if (snmp_mib_init((void __percpu **)net->mib.udplite_statistics,
 1617                           sizeof(struct udp_mib),
 1618                           __alignof__(struct udp_mib)) < 0)
 1619                 goto err_udplite_mib;
 1620         if (snmp_mib_init((void __percpu **)net->mib.icmp_statistics,
 1621                           sizeof(struct icmp_mib),
 1622                           __alignof__(struct icmp_mib)) < 0)
 1623                 goto err_icmp_mib;
 1624         net->mib.icmpmsg_statistics = kzalloc(sizeof(struct icmpmsg_mib),
 1625                                               GFP_KERNEL);
 1626         if (!net->mib.icmpmsg_statistics)
 1627                 goto err_icmpmsg_mib;
 1628 
 1629         tcp_mib_init(net);
 1630         return 0;
 1631 
 1632 err_icmpmsg_mib:
 1633         snmp_mib_free((void __percpu **)net->mib.icmp_statistics);
 1634 err_icmp_mib:
 1635         snmp_mib_free((void __percpu **)net->mib.udplite_statistics);
 1636 err_udplite_mib:
 1637         snmp_mib_free((void __percpu **)net->mib.udp_statistics);
 1638 err_udp_mib:
 1639         snmp_mib_free((void __percpu **)net->mib.net_statistics);
 1640 err_net_mib:
 1641         snmp_mib_free((void __percpu **)net->mib.ip_statistics);
 1642 err_ip_mib:
 1643         snmp_mib_free((void __percpu **)net->mib.tcp_statistics);
 1644 err_tcp_mib:
 1645         return -ENOMEM;
 1646 }
 1647 
 1648 static __net_exit void ipv4_mib_exit_net(struct net *net)
 1649 {
 1650         kfree(net->mib.icmpmsg_statistics);
 1651         snmp_mib_free((void __percpu **)net->mib.icmp_statistics);
 1652         snmp_mib_free((void __percpu **)net->mib.udplite_statistics);
 1653         snmp_mib_free((void __percpu **)net->mib.udp_statistics);
 1654         snmp_mib_free((void __percpu **)net->mib.net_statistics);
 1655         snmp_mib_free((void __percpu **)net->mib.ip_statistics);
 1656         snmp_mib_free((void __percpu **)net->mib.tcp_statistics);
 1657 }
 1658 
 1659 static __net_initdata struct pernet_operations ipv4_mib_ops = {
 1660         .init = ipv4_mib_init_net,
 1661         .exit = ipv4_mib_exit_net,
 1662 };
 1663 
 1664 static int __init init_ipv4_mibs(void)
 1665 {
 1666         return register_pernet_subsys(&ipv4_mib_ops);
 1667 }
 1668 
 1669 static int ipv4_proc_init(void);
 1670 
 1671 /*
 1672  *      IP protocol layer initialiser
 1673  */
 1674 
 1675 static struct packet_offload ip_packet_offload __read_mostly = {
 1676         .type = cpu_to_be16(ETH_P_IP),
 1677         .callbacks = {
 1678                 .gso_send_check = inet_gso_send_check,
 1679                 .gso_segment = inet_gso_segment,
 1680                 .gro_receive = inet_gro_receive,
 1681                 .gro_complete = inet_gro_complete,
 1682         },
 1683 };
 1684 
 1685 static int __init ipv4_offload_init(void)
 1686 {
 1687         /*
 1688          * Add offloads
 1689          */
 1690         if (inet_add_offload(&udp_offload, IPPROTO_UDP) < 0)
 1691                 pr_crit("%s: Cannot add UDP protocol offload\n", __func__);
 1692         if (inet_add_offload(&tcp_offload, IPPROTO_TCP) < 0)
 1693                 pr_crit("%s: Cannot add TCP protocol offlaod\n", __func__);
 1694 
 1695         dev_add_offload(&ip_packet_offload);
 1696         return 0;
 1697 }
 1698 
 1699 fs_initcall(ipv4_offload_init);
 1700 
 1701 static struct packet_type ip_packet_type __read_mostly = {
 1702         .type = cpu_to_be16(ETH_P_IP),
 1703         .func = ip_rcv,
 1704 };
 1705 
 1706 static int __init inet_init(void)
 1707 {
 1708         struct sk_buff *dummy_skb;
 1709         struct inet_protosw *q;
 1710         struct list_head *r;
 1711         int rc = -EINVAL;
 1712 
 1713         BUILD_BUG_ON(sizeof(struct inet_skb_parm) > sizeof(dummy_skb->cb));
 1714 
 1715         sysctl_local_reserved_ports = kzalloc(65536 / 8, GFP_KERNEL);
 1716         if (!sysctl_local_reserved_ports)
 1717                 goto out;
 1718 
 1719         rc = proto_register(&tcp_prot, 1);
 1720         if (rc)
 1721                 goto out_free_reserved_ports;
 1722 
 1723         rc = proto_register(&udp_prot, 1);
 1724         if (rc)
 1725                 goto out_unregister_tcp_proto;
 1726 
 1727         rc = proto_register(&raw_prot, 1);
 1728         if (rc)
 1729                 goto out_unregister_udp_proto;
 1730 
 1731         rc = proto_register(&ping_prot, 1);
 1732         if (rc)
 1733                 goto out_unregister_raw_proto;
 1734 
 1735         /*
 1736          *      Tell SOCKET that we are alive...
 1737          */
 1738 
 1739         (void)sock_register(&inet_family_ops);
 1740 
 1741 #ifdef CONFIG_SYSCTL
 1742         ip_static_sysctl_init();
 1743 #endif
 1744 
 1745         tcp_prot.sysctl_mem = init_net.ipv4.sysctl_tcp_mem;
 1746 
 1747         /*
 1748          *      Add all the base protocols.
 1749          */
 1750 
 1751         if (inet_add_protocol(&icmp_protocol, IPPROTO_ICMP) < 0)
 1752                 pr_crit("%s: Cannot add ICMP protocol\n", __func__);
 1753         if (inet_add_protocol(&udp_protocol, IPPROTO_UDP) < 0)
 1754                 pr_crit("%s: Cannot add UDP protocol\n", __func__);
 1755         if (inet_add_protocol(&tcp_protocol, IPPROTO_TCP) < 0)
 1756                 pr_crit("%s: Cannot add TCP protocol\n", __func__);
 1757 #ifdef CONFIG_IP_MULTICAST
 1758         if (inet_add_protocol(&igmp_protocol, IPPROTO_IGMP) < 0)
 1759                 pr_crit("%s: Cannot add IGMP protocol\n", __func__);
 1760 #endif
 1761 
 1762         /* Register the socket-side information for inet_create. */
 1763         for (r = &inetsw[0]; r < &inetsw[SOCK_MAX]; ++r)
 1764                 INIT_LIST_HEAD(r);
 1765 
 1766         for (q = inetsw_array; q < &inetsw_array[INETSW_ARRAY_LEN]; ++q)
 1767                 inet_register_protosw(q);
 1768 
 1769         /*
 1770          *      Set the ARP module up
 1771          */
 1772 
 1773         arp_init();
 1774 
 1775         /*
 1776          *      Set the IP module up
 1777          */
 1778 
 1779         ip_init();
 1780 
 1781         tcp_v4_init();
 1782 
 1783         /* Setup TCP slab cache for open requests. */
 1784         tcp_init();
 1785 
 1786         /* Setup UDP memory threshold */
 1787         udp_init();
 1788 
 1789         /* Add UDP-Lite (RFC 3828) */
 1790         udplite4_register();
 1791 
 1792         ping_init();
 1793 
 1794         /*
 1795          *      Set the ICMP layer up
 1796          */
 1797 
 1798         if (icmp_init() < 0)
 1799                 panic("Failed to create the ICMP control socket.\n");
 1800 
 1801         /*
 1802          *      Initialise the multicast router
 1803          */
 1804 #if defined(CONFIG_IP_MROUTE)
 1805         if (ip_mr_init())
 1806                 pr_crit("%s: Cannot init ipv4 mroute\n", __func__);
 1807 #endif
 1808         /*
 1809          *      Initialise per-cpu ipv4 mibs
 1810          */
 1811 
 1812         if (init_ipv4_mibs())
 1813                 pr_crit("%s: Cannot init ipv4 mibs\n", __func__);
 1814 
 1815         ipv4_proc_init();
 1816 
 1817         ipfrag_init();
 1818 
 1819         dev_add_pack(&ip_packet_type);
 1820 
 1821         rc = 0;
 1822 out:
 1823         return rc;
 1824 out_unregister_raw_proto:
 1825         proto_unregister(&raw_prot);
 1826 out_unregister_udp_proto:
 1827         proto_unregister(&udp_prot);
 1828 out_unregister_tcp_proto:
 1829         proto_unregister(&tcp_prot);
 1830 out_free_reserved_ports:
 1831         kfree(sysctl_local_reserved_ports);
 1832         goto out;
 1833 }
 1834 
 1835 fs_initcall(inet_init);
 1836 
 1837 /* ------------------------------------------------------------------------ */
 1838 
 1839 #ifdef CONFIG_PROC_FS
 1840 static int __init ipv4_proc_init(void)
 1841 {
 1842         int rc = 0;
 1843 
 1844         if (raw_proc_init())
 1845                 goto out_raw;
 1846         if (tcp4_proc_init())
 1847                 goto out_tcp;
 1848         if (udp4_proc_init())
 1849                 goto out_udp;
 1850         if (ping_proc_init())
 1851                 goto out_ping;
 1852         if (ip_misc_proc_init())
 1853                 goto out_misc;
 1854 out:
 1855         return rc;
 1856 out_misc:
 1857         ping_proc_exit();
 1858 out_ping:
 1859         udp4_proc_exit();
 1860 out_udp:
 1861         tcp4_proc_exit();
 1862 out_tcp:
 1863         raw_proc_exit();
 1864 out_raw:
 1865         rc = -ENOMEM;
 1866         goto out;
 1867 }
 1868 
 1869 #else /* CONFIG_PROC_FS */
 1870 static int __init ipv4_proc_init(void)
 1871 {
 1872         return 0;
 1873 }
 1874 #endif /* CONFIG_PROC_FS */
 1875 
 1876 MODULE_ALIAS_NETPROTO(PF_INET);
 1877 

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