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0001 // SPDX-License-Identifier: GPL-2.0-or-later
0002 /*
0003  * INET     An implementation of the TCP/IP protocol suite for the LINUX
0004  *      operating system.  INET is implemented using the  BSD Socket
0005  *      interface as the means of communication with the user level.
0006  *
0007  *      PF_INET protocol family socket handler.
0008  *
0009  * Authors: Ross Biro
0010  *      Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
0011  *      Florian La Roche, <flla@stud.uni-sb.de>
0012  *      Alan Cox, <A.Cox@swansea.ac.uk>
0013  *
0014  * Changes (see also sock.c)
0015  *
0016  *      piggy,
0017  *      Karl Knutson    :   Socket protocol table
0018  *      A.N.Kuznetsov   :   Socket death error in accept().
0019  *      John Richardson :   Fix non blocking error in connect()
0020  *                  so sockets that fail to connect
0021  *                  don't return -EINPROGRESS.
0022  *      Alan Cox    :   Asynchronous I/O support
0023  *      Alan Cox    :   Keep correct socket pointer on sock
0024  *                  structures
0025  *                  when accept() ed
0026  *      Alan Cox    :   Semantics of SO_LINGER aren't state
0027  *                  moved to close when you look carefully.
0028  *                  With this fixed and the accept bug fixed
0029  *                  some RPC stuff seems happier.
0030  *      Niibe Yutaka    :   4.4BSD style write async I/O
0031  *      Alan Cox,
0032  *      Tony Gale   :   Fixed reuse semantics.
0033  *      Alan Cox    :   bind() shouldn't abort existing but dead
0034  *                  sockets. Stops FTP netin:.. I hope.
0035  *      Alan Cox    :   bind() works correctly for RAW sockets.
0036  *                  Note that FreeBSD at least was broken
0037  *                  in this respect so be careful with
0038  *                  compatibility tests...
0039  *      Alan Cox    :   routing cache support
0040  *      Alan Cox    :   memzero the socket structure for
0041  *                  compactness.
0042  *      Matt Day    :   nonblock connect error handler
0043  *      Alan Cox    :   Allow large numbers of pending sockets
0044  *                  (eg for big web sites), but only if
0045  *                  specifically application requested.
0046  *      Alan Cox    :   New buffering throughout IP. Used
0047  *                  dumbly.
0048  *      Alan Cox    :   New buffering now used smartly.
0049  *      Alan Cox    :   BSD rather than common sense
0050  *                  interpretation of listen.
0051  *      Germano Caronni :   Assorted small races.
0052  *      Alan Cox    :   sendmsg/recvmsg basic support.
0053  *      Alan Cox    :   Only sendmsg/recvmsg now supported.
0054  *      Alan Cox    :   Locked down bind (see security list).
0055  *      Alan Cox    :   Loosened bind a little.
0056  *      Mike McLagan    :   ADD/DEL DLCI Ioctls
0057  *  Willy Konynenberg   :   Transparent proxying support.
0058  *      David S. Miller :   New socket lookup architecture.
0059  *                  Some other random speedups.
0060  *      Cyrus Durgin    :   Cleaned up file for kmod hacks.
0061  *      Andi Kleen  :   Fix inet_stream_connect TCP race.
0062  */
0063 
0064 #define pr_fmt(fmt) "IPv4: " fmt
0065 
0066 #include <linux/err.h>
0067 #include <linux/errno.h>
0068 #include <linux/types.h>
0069 #include <linux/socket.h>
0070 #include <linux/in.h>
0071 #include <linux/kernel.h>
0072 #include <linux/kmod.h>
0073 #include <linux/sched.h>
0074 #include <linux/timer.h>
0075 #include <linux/string.h>
0076 #include <linux/sockios.h>
0077 #include <linux/net.h>
0078 #include <linux/capability.h>
0079 #include <linux/fcntl.h>
0080 #include <linux/mm.h>
0081 #include <linux/interrupt.h>
0082 #include <linux/stat.h>
0083 #include <linux/init.h>
0084 #include <linux/poll.h>
0085 #include <linux/netfilter_ipv4.h>
0086 #include <linux/random.h>
0087 #include <linux/slab.h>
0088 
0089 #include <linux/uaccess.h>
0090 
0091 #include <linux/inet.h>
0092 #include <linux/igmp.h>
0093 #include <linux/inetdevice.h>
0094 #include <linux/netdevice.h>
0095 #include <net/checksum.h>
0096 #include <net/ip.h>
0097 #include <net/protocol.h>
0098 #include <net/arp.h>
0099 #include <net/route.h>
0100 #include <net/ip_fib.h>
0101 #include <net/inet_connection_sock.h>
0102 #include <net/gro.h>
0103 #include <net/tcp.h>
0104 #include <net/udp.h>
0105 #include <net/udplite.h>
0106 #include <net/ping.h>
0107 #include <linux/skbuff.h>
0108 #include <net/sock.h>
0109 #include <net/raw.h>
0110 #include <net/icmp.h>
0111 #include <net/inet_common.h>
0112 #include <net/ip_tunnels.h>
0113 #include <net/xfrm.h>
0114 #include <net/net_namespace.h>
0115 #include <net/secure_seq.h>
0116 #ifdef CONFIG_IP_MROUTE
0117 #include <linux/mroute.h>
0118 #endif
0119 #include <net/l3mdev.h>
0120 #include <net/compat.h>
0121 
0122 #include <trace/events/sock.h>
0123 
0124 /* The inetsw table contains everything that inet_create needs to
0125  * build a new socket.
0126  */
0127 static struct list_head inetsw[SOCK_MAX];
0128 static DEFINE_SPINLOCK(inetsw_lock);
0129 
0130 /* New destruction routine */
0131 
0132 void inet_sock_destruct(struct sock *sk)
0133 {
0134     struct inet_sock *inet = inet_sk(sk);
0135 
0136     __skb_queue_purge(&sk->sk_receive_queue);
0137     __skb_queue_purge(&sk->sk_error_queue);
0138 
0139     sk_mem_reclaim_final(sk);
0140 
0141     if (sk->sk_type == SOCK_STREAM && sk->sk_state != TCP_CLOSE) {
0142         pr_err("Attempt to release TCP socket in state %d %p\n",
0143                sk->sk_state, sk);
0144         return;
0145     }
0146     if (!sock_flag(sk, SOCK_DEAD)) {
0147         pr_err("Attempt to release alive inet socket %p\n", sk);
0148         return;
0149     }
0150 
0151     WARN_ON_ONCE(atomic_read(&sk->sk_rmem_alloc));
0152     WARN_ON_ONCE(refcount_read(&sk->sk_wmem_alloc));
0153     WARN_ON_ONCE(sk->sk_wmem_queued);
0154     WARN_ON_ONCE(sk_forward_alloc_get(sk));
0155 
0156     kfree(rcu_dereference_protected(inet->inet_opt, 1));
0157     dst_release(rcu_dereference_protected(sk->sk_dst_cache, 1));
0158     dst_release(rcu_dereference_protected(sk->sk_rx_dst, 1));
0159     sk_refcnt_debug_dec(sk);
0160 }
0161 EXPORT_SYMBOL(inet_sock_destruct);
0162 
0163 /*
0164  *  The routines beyond this point handle the behaviour of an AF_INET
0165  *  socket object. Mostly it punts to the subprotocols of IP to do
0166  *  the work.
0167  */
0168 
0169 /*
0170  *  Automatically bind an unbound socket.
0171  */
0172 
0173 static int inet_autobind(struct sock *sk)
0174 {
0175     struct inet_sock *inet;
0176     /* We may need to bind the socket. */
0177     lock_sock(sk);
0178     inet = inet_sk(sk);
0179     if (!inet->inet_num) {
0180         if (sk->sk_prot->get_port(sk, 0)) {
0181             release_sock(sk);
0182             return -EAGAIN;
0183         }
0184         inet->inet_sport = htons(inet->inet_num);
0185     }
0186     release_sock(sk);
0187     return 0;
0188 }
0189 
0190 /*
0191  *  Move a socket into listening state.
0192  */
0193 int inet_listen(struct socket *sock, int backlog)
0194 {
0195     struct sock *sk = sock->sk;
0196     unsigned char old_state;
0197     int err, tcp_fastopen;
0198 
0199     lock_sock(sk);
0200 
0201     err = -EINVAL;
0202     if (sock->state != SS_UNCONNECTED || sock->type != SOCK_STREAM)
0203         goto out;
0204 
0205     old_state = sk->sk_state;
0206     if (!((1 << old_state) & (TCPF_CLOSE | TCPF_LISTEN)))
0207         goto out;
0208 
0209     WRITE_ONCE(sk->sk_max_ack_backlog, backlog);
0210     /* Really, if the socket is already in listen state
0211      * we can only allow the backlog to be adjusted.
0212      */
0213     if (old_state != TCP_LISTEN) {
0214         /* Enable TFO w/o requiring TCP_FASTOPEN socket option.
0215          * Note that only TCP sockets (SOCK_STREAM) will reach here.
0216          * Also fastopen backlog may already been set via the option
0217          * because the socket was in TCP_LISTEN state previously but
0218          * was shutdown() rather than close().
0219          */
0220         tcp_fastopen = READ_ONCE(sock_net(sk)->ipv4.sysctl_tcp_fastopen);
0221         if ((tcp_fastopen & TFO_SERVER_WO_SOCKOPT1) &&
0222             (tcp_fastopen & TFO_SERVER_ENABLE) &&
0223             !inet_csk(sk)->icsk_accept_queue.fastopenq.max_qlen) {
0224             fastopen_queue_tune(sk, backlog);
0225             tcp_fastopen_init_key_once(sock_net(sk));
0226         }
0227 
0228         err = inet_csk_listen_start(sk);
0229         if (err)
0230             goto out;
0231         tcp_call_bpf(sk, BPF_SOCK_OPS_TCP_LISTEN_CB, 0, NULL);
0232     }
0233     err = 0;
0234 
0235 out:
0236     release_sock(sk);
0237     return err;
0238 }
0239 EXPORT_SYMBOL(inet_listen);
0240 
0241 /*
0242  *  Create an inet socket.
0243  */
0244 
0245 static int inet_create(struct net *net, struct socket *sock, int protocol,
0246                int kern)
0247 {
0248     struct sock *sk;
0249     struct inet_protosw *answer;
0250     struct inet_sock *inet;
0251     struct proto *answer_prot;
0252     unsigned char answer_flags;
0253     int try_loading_module = 0;
0254     int err;
0255 
0256     if (protocol < 0 || protocol >= IPPROTO_MAX)
0257         return -EINVAL;
0258 
0259     sock->state = SS_UNCONNECTED;
0260 
0261     /* Look for the requested type/protocol pair. */
0262 lookup_protocol:
0263     err = -ESOCKTNOSUPPORT;
0264     rcu_read_lock();
0265     list_for_each_entry_rcu(answer, &inetsw[sock->type], list) {
0266 
0267         err = 0;
0268         /* Check the non-wild match. */
0269         if (protocol == answer->protocol) {
0270             if (protocol != IPPROTO_IP)
0271                 break;
0272         } else {
0273             /* Check for the two wild cases. */
0274             if (IPPROTO_IP == protocol) {
0275                 protocol = answer->protocol;
0276                 break;
0277             }
0278             if (IPPROTO_IP == answer->protocol)
0279                 break;
0280         }
0281         err = -EPROTONOSUPPORT;
0282     }
0283 
0284     if (unlikely(err)) {
0285         if (try_loading_module < 2) {
0286             rcu_read_unlock();
0287             /*
0288              * Be more specific, e.g. net-pf-2-proto-132-type-1
0289              * (net-pf-PF_INET-proto-IPPROTO_SCTP-type-SOCK_STREAM)
0290              */
0291             if (++try_loading_module == 1)
0292                 request_module("net-pf-%d-proto-%d-type-%d",
0293                            PF_INET, protocol, sock->type);
0294             /*
0295              * Fall back to generic, e.g. net-pf-2-proto-132
0296              * (net-pf-PF_INET-proto-IPPROTO_SCTP)
0297              */
0298             else
0299                 request_module("net-pf-%d-proto-%d",
0300                            PF_INET, protocol);
0301             goto lookup_protocol;
0302         } else
0303             goto out_rcu_unlock;
0304     }
0305 
0306     err = -EPERM;
0307     if (sock->type == SOCK_RAW && !kern &&
0308         !ns_capable(net->user_ns, CAP_NET_RAW))
0309         goto out_rcu_unlock;
0310 
0311     sock->ops = answer->ops;
0312     answer_prot = answer->prot;
0313     answer_flags = answer->flags;
0314     rcu_read_unlock();
0315 
0316     WARN_ON(!answer_prot->slab);
0317 
0318     err = -ENOMEM;
0319     sk = sk_alloc(net, PF_INET, GFP_KERNEL, answer_prot, kern);
0320     if (!sk)
0321         goto out;
0322 
0323     err = 0;
0324     if (INET_PROTOSW_REUSE & answer_flags)
0325         sk->sk_reuse = SK_CAN_REUSE;
0326 
0327     inet = inet_sk(sk);
0328     inet->is_icsk = (INET_PROTOSW_ICSK & answer_flags) != 0;
0329 
0330     inet->nodefrag = 0;
0331 
0332     if (SOCK_RAW == sock->type) {
0333         inet->inet_num = protocol;
0334         if (IPPROTO_RAW == protocol)
0335             inet->hdrincl = 1;
0336     }
0337 
0338     if (READ_ONCE(net->ipv4.sysctl_ip_no_pmtu_disc))
0339         inet->pmtudisc = IP_PMTUDISC_DONT;
0340     else
0341         inet->pmtudisc = IP_PMTUDISC_WANT;
0342 
0343     inet->inet_id = 0;
0344 
0345     sock_init_data(sock, sk);
0346 
0347     sk->sk_destruct    = inet_sock_destruct;
0348     sk->sk_protocol    = protocol;
0349     sk->sk_backlog_rcv = sk->sk_prot->backlog_rcv;
0350 
0351     inet->uc_ttl    = -1;
0352     inet->mc_loop   = 1;
0353     inet->mc_ttl    = 1;
0354     inet->mc_all    = 1;
0355     inet->mc_index  = 0;
0356     inet->mc_list   = NULL;
0357     inet->rcv_tos   = 0;
0358 
0359     sk_refcnt_debug_inc(sk);
0360 
0361     if (inet->inet_num) {
0362         /* It assumes that any protocol which allows
0363          * the user to assign a number at socket
0364          * creation time automatically
0365          * shares.
0366          */
0367         inet->inet_sport = htons(inet->inet_num);
0368         /* Add to protocol hash chains. */
0369         err = sk->sk_prot->hash(sk);
0370         if (err) {
0371             sk_common_release(sk);
0372             goto out;
0373         }
0374     }
0375 
0376     if (sk->sk_prot->init) {
0377         err = sk->sk_prot->init(sk);
0378         if (err) {
0379             sk_common_release(sk);
0380             goto out;
0381         }
0382     }
0383 
0384     if (!kern) {
0385         err = BPF_CGROUP_RUN_PROG_INET_SOCK(sk);
0386         if (err) {
0387             sk_common_release(sk);
0388             goto out;
0389         }
0390     }
0391 out:
0392     return err;
0393 out_rcu_unlock:
0394     rcu_read_unlock();
0395     goto out;
0396 }
0397 
0398 
0399 /*
0400  *  The peer socket should always be NULL (or else). When we call this
0401  *  function we are destroying the object and from then on nobody
0402  *  should refer to it.
0403  */
0404 int inet_release(struct socket *sock)
0405 {
0406     struct sock *sk = sock->sk;
0407 
0408     if (sk) {
0409         long timeout;
0410 
0411         if (!sk->sk_kern_sock)
0412             BPF_CGROUP_RUN_PROG_INET_SOCK_RELEASE(sk);
0413 
0414         /* Applications forget to leave groups before exiting */
0415         ip_mc_drop_socket(sk);
0416 
0417         /* If linger is set, we don't return until the close
0418          * is complete.  Otherwise we return immediately. The
0419          * actually closing is done the same either way.
0420          *
0421          * If the close is due to the process exiting, we never
0422          * linger..
0423          */
0424         timeout = 0;
0425         if (sock_flag(sk, SOCK_LINGER) &&
0426             !(current->flags & PF_EXITING))
0427             timeout = sk->sk_lingertime;
0428         sk->sk_prot->close(sk, timeout);
0429         sock->sk = NULL;
0430     }
0431     return 0;
0432 }
0433 EXPORT_SYMBOL(inet_release);
0434 
0435 int inet_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
0436 {
0437     struct sock *sk = sock->sk;
0438     u32 flags = BIND_WITH_LOCK;
0439     int err;
0440 
0441     /* If the socket has its own bind function then use it. (RAW) */
0442     if (sk->sk_prot->bind) {
0443         return sk->sk_prot->bind(sk, uaddr, addr_len);
0444     }
0445     if (addr_len < sizeof(struct sockaddr_in))
0446         return -EINVAL;
0447 
0448     /* BPF prog is run before any checks are done so that if the prog
0449      * changes context in a wrong way it will be caught.
0450      */
0451     err = BPF_CGROUP_RUN_PROG_INET_BIND_LOCK(sk, uaddr,
0452                          CGROUP_INET4_BIND, &flags);
0453     if (err)
0454         return err;
0455 
0456     return __inet_bind(sk, uaddr, addr_len, flags);
0457 }
0458 EXPORT_SYMBOL(inet_bind);
0459 
0460 int __inet_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len,
0461         u32 flags)
0462 {
0463     struct sockaddr_in *addr = (struct sockaddr_in *)uaddr;
0464     struct inet_sock *inet = inet_sk(sk);
0465     struct net *net = sock_net(sk);
0466     unsigned short snum;
0467     int chk_addr_ret;
0468     u32 tb_id = RT_TABLE_LOCAL;
0469     int err;
0470 
0471     if (addr->sin_family != AF_INET) {
0472         /* Compatibility games : accept AF_UNSPEC (mapped to AF_INET)
0473          * only if s_addr is INADDR_ANY.
0474          */
0475         err = -EAFNOSUPPORT;
0476         if (addr->sin_family != AF_UNSPEC ||
0477             addr->sin_addr.s_addr != htonl(INADDR_ANY))
0478             goto out;
0479     }
0480 
0481     tb_id = l3mdev_fib_table_by_index(net, sk->sk_bound_dev_if) ? : tb_id;
0482     chk_addr_ret = inet_addr_type_table(net, addr->sin_addr.s_addr, tb_id);
0483 
0484     /* Not specified by any standard per-se, however it breaks too
0485      * many applications when removed.  It is unfortunate since
0486      * allowing applications to make a non-local bind solves
0487      * several problems with systems using dynamic addressing.
0488      * (ie. your servers still start up even if your ISDN link
0489      *  is temporarily down)
0490      */
0491     err = -EADDRNOTAVAIL;
0492     if (!inet_addr_valid_or_nonlocal(net, inet, addr->sin_addr.s_addr,
0493                                      chk_addr_ret))
0494         goto out;
0495 
0496     snum = ntohs(addr->sin_port);
0497     err = -EACCES;
0498     if (!(flags & BIND_NO_CAP_NET_BIND_SERVICE) &&
0499         snum && inet_port_requires_bind_service(net, snum) &&
0500         !ns_capable(net->user_ns, CAP_NET_BIND_SERVICE))
0501         goto out;
0502 
0503     /*      We keep a pair of addresses. rcv_saddr is the one
0504      *      used by hash lookups, and saddr is used for transmit.
0505      *
0506      *      In the BSD API these are the same except where it
0507      *      would be illegal to use them (multicast/broadcast) in
0508      *      which case the sending device address is used.
0509      */
0510     if (flags & BIND_WITH_LOCK)
0511         lock_sock(sk);
0512 
0513     /* Check these errors (active socket, double bind). */
0514     err = -EINVAL;
0515     if (sk->sk_state != TCP_CLOSE || inet->inet_num)
0516         goto out_release_sock;
0517 
0518     inet->inet_rcv_saddr = inet->inet_saddr = addr->sin_addr.s_addr;
0519     if (chk_addr_ret == RTN_MULTICAST || chk_addr_ret == RTN_BROADCAST)
0520         inet->inet_saddr = 0;  /* Use device */
0521 
0522     /* Make sure we are allowed to bind here. */
0523     if (snum || !(inet->bind_address_no_port ||
0524               (flags & BIND_FORCE_ADDRESS_NO_PORT))) {
0525         if (sk->sk_prot->get_port(sk, snum)) {
0526             inet->inet_saddr = inet->inet_rcv_saddr = 0;
0527             err = -EADDRINUSE;
0528             goto out_release_sock;
0529         }
0530         if (!(flags & BIND_FROM_BPF)) {
0531             err = BPF_CGROUP_RUN_PROG_INET4_POST_BIND(sk);
0532             if (err) {
0533                 inet->inet_saddr = inet->inet_rcv_saddr = 0;
0534                 if (sk->sk_prot->put_port)
0535                     sk->sk_prot->put_port(sk);
0536                 goto out_release_sock;
0537             }
0538         }
0539     }
0540 
0541     if (inet->inet_rcv_saddr)
0542         sk->sk_userlocks |= SOCK_BINDADDR_LOCK;
0543     if (snum)
0544         sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
0545     inet->inet_sport = htons(inet->inet_num);
0546     inet->inet_daddr = 0;
0547     inet->inet_dport = 0;
0548     sk_dst_reset(sk);
0549     err = 0;
0550 out_release_sock:
0551     if (flags & BIND_WITH_LOCK)
0552         release_sock(sk);
0553 out:
0554     return err;
0555 }
0556 
0557 int inet_dgram_connect(struct socket *sock, struct sockaddr *uaddr,
0558                int addr_len, int flags)
0559 {
0560     struct sock *sk = sock->sk;
0561     int err;
0562 
0563     if (addr_len < sizeof(uaddr->sa_family))
0564         return -EINVAL;
0565     if (uaddr->sa_family == AF_UNSPEC)
0566         return sk->sk_prot->disconnect(sk, flags);
0567 
0568     if (BPF_CGROUP_PRE_CONNECT_ENABLED(sk)) {
0569         err = sk->sk_prot->pre_connect(sk, uaddr, addr_len);
0570         if (err)
0571             return err;
0572     }
0573 
0574     if (data_race(!inet_sk(sk)->inet_num) && inet_autobind(sk))
0575         return -EAGAIN;
0576     return sk->sk_prot->connect(sk, uaddr, addr_len);
0577 }
0578 EXPORT_SYMBOL(inet_dgram_connect);
0579 
0580 static long inet_wait_for_connect(struct sock *sk, long timeo, int writebias)
0581 {
0582     DEFINE_WAIT_FUNC(wait, woken_wake_function);
0583 
0584     add_wait_queue(sk_sleep(sk), &wait);
0585     sk->sk_write_pending += writebias;
0586 
0587     /* Basic assumption: if someone sets sk->sk_err, he _must_
0588      * change state of the socket from TCP_SYN_*.
0589      * Connect() does not allow to get error notifications
0590      * without closing the socket.
0591      */
0592     while ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV)) {
0593         release_sock(sk);
0594         timeo = wait_woken(&wait, TASK_INTERRUPTIBLE, timeo);
0595         lock_sock(sk);
0596         if (signal_pending(current) || !timeo)
0597             break;
0598     }
0599     remove_wait_queue(sk_sleep(sk), &wait);
0600     sk->sk_write_pending -= writebias;
0601     return timeo;
0602 }
0603 
0604 /*
0605  *  Connect to a remote host. There is regrettably still a little
0606  *  TCP 'magic' in here.
0607  */
0608 int __inet_stream_connect(struct socket *sock, struct sockaddr *uaddr,
0609               int addr_len, int flags, int is_sendmsg)
0610 {
0611     struct sock *sk = sock->sk;
0612     int err;
0613     long timeo;
0614 
0615     /*
0616      * uaddr can be NULL and addr_len can be 0 if:
0617      * sk is a TCP fastopen active socket and
0618      * TCP_FASTOPEN_CONNECT sockopt is set and
0619      * we already have a valid cookie for this socket.
0620      * In this case, user can call write() after connect().
0621      * write() will invoke tcp_sendmsg_fastopen() which calls
0622      * __inet_stream_connect().
0623      */
0624     if (uaddr) {
0625         if (addr_len < sizeof(uaddr->sa_family))
0626             return -EINVAL;
0627 
0628         if (uaddr->sa_family == AF_UNSPEC) {
0629             err = sk->sk_prot->disconnect(sk, flags);
0630             sock->state = err ? SS_DISCONNECTING : SS_UNCONNECTED;
0631             goto out;
0632         }
0633     }
0634 
0635     switch (sock->state) {
0636     default:
0637         err = -EINVAL;
0638         goto out;
0639     case SS_CONNECTED:
0640         err = -EISCONN;
0641         goto out;
0642     case SS_CONNECTING:
0643         if (inet_sk(sk)->defer_connect)
0644             err = is_sendmsg ? -EINPROGRESS : -EISCONN;
0645         else
0646             err = -EALREADY;
0647         /* Fall out of switch with err, set for this state */
0648         break;
0649     case SS_UNCONNECTED:
0650         err = -EISCONN;
0651         if (sk->sk_state != TCP_CLOSE)
0652             goto out;
0653 
0654         if (BPF_CGROUP_PRE_CONNECT_ENABLED(sk)) {
0655             err = sk->sk_prot->pre_connect(sk, uaddr, addr_len);
0656             if (err)
0657                 goto out;
0658         }
0659 
0660         err = sk->sk_prot->connect(sk, uaddr, addr_len);
0661         if (err < 0)
0662             goto out;
0663 
0664         sock->state = SS_CONNECTING;
0665 
0666         if (!err && inet_sk(sk)->defer_connect)
0667             goto out;
0668 
0669         /* Just entered SS_CONNECTING state; the only
0670          * difference is that return value in non-blocking
0671          * case is EINPROGRESS, rather than EALREADY.
0672          */
0673         err = -EINPROGRESS;
0674         break;
0675     }
0676 
0677     timeo = sock_sndtimeo(sk, flags & O_NONBLOCK);
0678 
0679     if ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV)) {
0680         int writebias = (sk->sk_protocol == IPPROTO_TCP) &&
0681                 tcp_sk(sk)->fastopen_req &&
0682                 tcp_sk(sk)->fastopen_req->data ? 1 : 0;
0683 
0684         /* Error code is set above */
0685         if (!timeo || !inet_wait_for_connect(sk, timeo, writebias))
0686             goto out;
0687 
0688         err = sock_intr_errno(timeo);
0689         if (signal_pending(current))
0690             goto out;
0691     }
0692 
0693     /* Connection was closed by RST, timeout, ICMP error
0694      * or another process disconnected us.
0695      */
0696     if (sk->sk_state == TCP_CLOSE)
0697         goto sock_error;
0698 
0699     /* sk->sk_err may be not zero now, if RECVERR was ordered by user
0700      * and error was received after socket entered established state.
0701      * Hence, it is handled normally after connect() return successfully.
0702      */
0703 
0704     sock->state = SS_CONNECTED;
0705     err = 0;
0706 out:
0707     return err;
0708 
0709 sock_error:
0710     err = sock_error(sk) ? : -ECONNABORTED;
0711     sock->state = SS_UNCONNECTED;
0712     if (sk->sk_prot->disconnect(sk, flags))
0713         sock->state = SS_DISCONNECTING;
0714     goto out;
0715 }
0716 EXPORT_SYMBOL(__inet_stream_connect);
0717 
0718 int inet_stream_connect(struct socket *sock, struct sockaddr *uaddr,
0719             int addr_len, int flags)
0720 {
0721     int err;
0722 
0723     lock_sock(sock->sk);
0724     err = __inet_stream_connect(sock, uaddr, addr_len, flags, 0);
0725     release_sock(sock->sk);
0726     return err;
0727 }
0728 EXPORT_SYMBOL(inet_stream_connect);
0729 
0730 /*
0731  *  Accept a pending connection. The TCP layer now gives BSD semantics.
0732  */
0733 
0734 int inet_accept(struct socket *sock, struct socket *newsock, int flags,
0735         bool kern)
0736 {
0737     struct sock *sk1 = sock->sk;
0738     int err = -EINVAL;
0739     struct sock *sk2 = sk1->sk_prot->accept(sk1, flags, &err, kern);
0740 
0741     if (!sk2)
0742         goto do_err;
0743 
0744     lock_sock(sk2);
0745 
0746     sock_rps_record_flow(sk2);
0747     WARN_ON(!((1 << sk2->sk_state) &
0748           (TCPF_ESTABLISHED | TCPF_SYN_RECV |
0749           TCPF_CLOSE_WAIT | TCPF_CLOSE)));
0750 
0751     sock_graft(sk2, newsock);
0752 
0753     newsock->state = SS_CONNECTED;
0754     err = 0;
0755     release_sock(sk2);
0756 do_err:
0757     return err;
0758 }
0759 EXPORT_SYMBOL(inet_accept);
0760 
0761 /*
0762  *  This does both peername and sockname.
0763  */
0764 int inet_getname(struct socket *sock, struct sockaddr *uaddr,
0765          int peer)
0766 {
0767     struct sock *sk     = sock->sk;
0768     struct inet_sock *inet  = inet_sk(sk);
0769     DECLARE_SOCKADDR(struct sockaddr_in *, sin, uaddr);
0770 
0771     sin->sin_family = AF_INET;
0772     lock_sock(sk);
0773     if (peer) {
0774         if (!inet->inet_dport ||
0775             (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) &&
0776              peer == 1)) {
0777             release_sock(sk);
0778             return -ENOTCONN;
0779         }
0780         sin->sin_port = inet->inet_dport;
0781         sin->sin_addr.s_addr = inet->inet_daddr;
0782         BPF_CGROUP_RUN_SA_PROG(sk, (struct sockaddr *)sin,
0783                        CGROUP_INET4_GETPEERNAME);
0784     } else {
0785         __be32 addr = inet->inet_rcv_saddr;
0786         if (!addr)
0787             addr = inet->inet_saddr;
0788         sin->sin_port = inet->inet_sport;
0789         sin->sin_addr.s_addr = addr;
0790         BPF_CGROUP_RUN_SA_PROG(sk, (struct sockaddr *)sin,
0791                        CGROUP_INET4_GETSOCKNAME);
0792     }
0793     release_sock(sk);
0794     memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
0795     return sizeof(*sin);
0796 }
0797 EXPORT_SYMBOL(inet_getname);
0798 
0799 int inet_send_prepare(struct sock *sk)
0800 {
0801     sock_rps_record_flow(sk);
0802 
0803     /* We may need to bind the socket. */
0804     if (data_race(!inet_sk(sk)->inet_num) && !sk->sk_prot->no_autobind &&
0805         inet_autobind(sk))
0806         return -EAGAIN;
0807 
0808     return 0;
0809 }
0810 EXPORT_SYMBOL_GPL(inet_send_prepare);
0811 
0812 int inet_sendmsg(struct socket *sock, struct msghdr *msg, size_t size)
0813 {
0814     struct sock *sk = sock->sk;
0815 
0816     if (unlikely(inet_send_prepare(sk)))
0817         return -EAGAIN;
0818 
0819     return INDIRECT_CALL_2(sk->sk_prot->sendmsg, tcp_sendmsg, udp_sendmsg,
0820                    sk, msg, size);
0821 }
0822 EXPORT_SYMBOL(inet_sendmsg);
0823 
0824 ssize_t inet_sendpage(struct socket *sock, struct page *page, int offset,
0825               size_t size, int flags)
0826 {
0827     struct sock *sk = sock->sk;
0828 
0829     if (unlikely(inet_send_prepare(sk)))
0830         return -EAGAIN;
0831 
0832     if (sk->sk_prot->sendpage)
0833         return sk->sk_prot->sendpage(sk, page, offset, size, flags);
0834     return sock_no_sendpage(sock, page, offset, size, flags);
0835 }
0836 EXPORT_SYMBOL(inet_sendpage);
0837 
0838 INDIRECT_CALLABLE_DECLARE(int udp_recvmsg(struct sock *, struct msghdr *,
0839                       size_t, int, int *));
0840 int inet_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
0841          int flags)
0842 {
0843     struct sock *sk = sock->sk;
0844     int addr_len = 0;
0845     int err;
0846 
0847     if (likely(!(flags & MSG_ERRQUEUE)))
0848         sock_rps_record_flow(sk);
0849 
0850     err = INDIRECT_CALL_2(sk->sk_prot->recvmsg, tcp_recvmsg, udp_recvmsg,
0851                   sk, msg, size, flags, &addr_len);
0852     if (err >= 0)
0853         msg->msg_namelen = addr_len;
0854     return err;
0855 }
0856 EXPORT_SYMBOL(inet_recvmsg);
0857 
0858 int inet_shutdown(struct socket *sock, int how)
0859 {
0860     struct sock *sk = sock->sk;
0861     int err = 0;
0862 
0863     /* This should really check to make sure
0864      * the socket is a TCP socket. (WHY AC...)
0865      */
0866     how++; /* maps 0->1 has the advantage of making bit 1 rcvs and
0867                1->2 bit 2 snds.
0868                2->3 */
0869     if ((how & ~SHUTDOWN_MASK) || !how) /* MAXINT->0 */
0870         return -EINVAL;
0871 
0872     lock_sock(sk);
0873     if (sock->state == SS_CONNECTING) {
0874         if ((1 << sk->sk_state) &
0875             (TCPF_SYN_SENT | TCPF_SYN_RECV | TCPF_CLOSE))
0876             sock->state = SS_DISCONNECTING;
0877         else
0878             sock->state = SS_CONNECTED;
0879     }
0880 
0881     switch (sk->sk_state) {
0882     case TCP_CLOSE:
0883         err = -ENOTCONN;
0884         /* Hack to wake up other listeners, who can poll for
0885            EPOLLHUP, even on eg. unconnected UDP sockets -- RR */
0886         fallthrough;
0887     default:
0888         sk->sk_shutdown |= how;
0889         if (sk->sk_prot->shutdown)
0890             sk->sk_prot->shutdown(sk, how);
0891         break;
0892 
0893     /* Remaining two branches are temporary solution for missing
0894      * close() in multithreaded environment. It is _not_ a good idea,
0895      * but we have no choice until close() is repaired at VFS level.
0896      */
0897     case TCP_LISTEN:
0898         if (!(how & RCV_SHUTDOWN))
0899             break;
0900         fallthrough;
0901     case TCP_SYN_SENT:
0902         err = sk->sk_prot->disconnect(sk, O_NONBLOCK);
0903         sock->state = err ? SS_DISCONNECTING : SS_UNCONNECTED;
0904         break;
0905     }
0906 
0907     /* Wake up anyone sleeping in poll. */
0908     sk->sk_state_change(sk);
0909     release_sock(sk);
0910     return err;
0911 }
0912 EXPORT_SYMBOL(inet_shutdown);
0913 
0914 /*
0915  *  ioctl() calls you can issue on an INET socket. Most of these are
0916  *  device configuration and stuff and very rarely used. Some ioctls
0917  *  pass on to the socket itself.
0918  *
0919  *  NOTE: I like the idea of a module for the config stuff. ie ifconfig
0920  *  loads the devconfigure module does its configuring and unloads it.
0921  *  There's a good 20K of config code hanging around the kernel.
0922  */
0923 
0924 int inet_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
0925 {
0926     struct sock *sk = sock->sk;
0927     int err = 0;
0928     struct net *net = sock_net(sk);
0929     void __user *p = (void __user *)arg;
0930     struct ifreq ifr;
0931     struct rtentry rt;
0932 
0933     switch (cmd) {
0934     case SIOCADDRT:
0935     case SIOCDELRT:
0936         if (copy_from_user(&rt, p, sizeof(struct rtentry)))
0937             return -EFAULT;
0938         err = ip_rt_ioctl(net, cmd, &rt);
0939         break;
0940     case SIOCRTMSG:
0941         err = -EINVAL;
0942         break;
0943     case SIOCDARP:
0944     case SIOCGARP:
0945     case SIOCSARP:
0946         err = arp_ioctl(net, cmd, (void __user *)arg);
0947         break;
0948     case SIOCGIFADDR:
0949     case SIOCGIFBRDADDR:
0950     case SIOCGIFNETMASK:
0951     case SIOCGIFDSTADDR:
0952     case SIOCGIFPFLAGS:
0953         if (get_user_ifreq(&ifr, NULL, p))
0954             return -EFAULT;
0955         err = devinet_ioctl(net, cmd, &ifr);
0956         if (!err && put_user_ifreq(&ifr, p))
0957             err = -EFAULT;
0958         break;
0959 
0960     case SIOCSIFADDR:
0961     case SIOCSIFBRDADDR:
0962     case SIOCSIFNETMASK:
0963     case SIOCSIFDSTADDR:
0964     case SIOCSIFPFLAGS:
0965     case SIOCSIFFLAGS:
0966         if (get_user_ifreq(&ifr, NULL, p))
0967             return -EFAULT;
0968         err = devinet_ioctl(net, cmd, &ifr);
0969         break;
0970     default:
0971         if (sk->sk_prot->ioctl)
0972             err = sk->sk_prot->ioctl(sk, cmd, arg);
0973         else
0974             err = -ENOIOCTLCMD;
0975         break;
0976     }
0977     return err;
0978 }
0979 EXPORT_SYMBOL(inet_ioctl);
0980 
0981 #ifdef CONFIG_COMPAT
0982 static int inet_compat_routing_ioctl(struct sock *sk, unsigned int cmd,
0983         struct compat_rtentry __user *ur)
0984 {
0985     compat_uptr_t rtdev;
0986     struct rtentry rt;
0987 
0988     if (copy_from_user(&rt.rt_dst, &ur->rt_dst,
0989             3 * sizeof(struct sockaddr)) ||
0990         get_user(rt.rt_flags, &ur->rt_flags) ||
0991         get_user(rt.rt_metric, &ur->rt_metric) ||
0992         get_user(rt.rt_mtu, &ur->rt_mtu) ||
0993         get_user(rt.rt_window, &ur->rt_window) ||
0994         get_user(rt.rt_irtt, &ur->rt_irtt) ||
0995         get_user(rtdev, &ur->rt_dev))
0996         return -EFAULT;
0997 
0998     rt.rt_dev = compat_ptr(rtdev);
0999     return ip_rt_ioctl(sock_net(sk), cmd, &rt);
1000 }
1001 
1002 static int inet_compat_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1003 {
1004     void __user *argp = compat_ptr(arg);
1005     struct sock *sk = sock->sk;
1006 
1007     switch (cmd) {
1008     case SIOCADDRT:
1009     case SIOCDELRT:
1010         return inet_compat_routing_ioctl(sk, cmd, argp);
1011     default:
1012         if (!sk->sk_prot->compat_ioctl)
1013             return -ENOIOCTLCMD;
1014         return sk->sk_prot->compat_ioctl(sk, cmd, arg);
1015     }
1016 }
1017 #endif /* CONFIG_COMPAT */
1018 
1019 const struct proto_ops inet_stream_ops = {
1020     .family        = PF_INET,
1021     .owner         = THIS_MODULE,
1022     .release       = inet_release,
1023     .bind          = inet_bind,
1024     .connect       = inet_stream_connect,
1025     .socketpair    = sock_no_socketpair,
1026     .accept        = inet_accept,
1027     .getname       = inet_getname,
1028     .poll          = tcp_poll,
1029     .ioctl         = inet_ioctl,
1030     .gettstamp     = sock_gettstamp,
1031     .listen        = inet_listen,
1032     .shutdown      = inet_shutdown,
1033     .setsockopt    = sock_common_setsockopt,
1034     .getsockopt    = sock_common_getsockopt,
1035     .sendmsg       = inet_sendmsg,
1036     .recvmsg       = inet_recvmsg,
1037 #ifdef CONFIG_MMU
1038     .mmap          = tcp_mmap,
1039 #endif
1040     .sendpage      = inet_sendpage,
1041     .splice_read       = tcp_splice_read,
1042     .read_sock     = tcp_read_sock,
1043     .read_skb      = tcp_read_skb,
1044     .sendmsg_locked    = tcp_sendmsg_locked,
1045     .sendpage_locked   = tcp_sendpage_locked,
1046     .peek_len      = tcp_peek_len,
1047 #ifdef CONFIG_COMPAT
1048     .compat_ioctl      = inet_compat_ioctl,
1049 #endif
1050     .set_rcvlowat      = tcp_set_rcvlowat,
1051 };
1052 EXPORT_SYMBOL(inet_stream_ops);
1053 
1054 const struct proto_ops inet_dgram_ops = {
1055     .family        = PF_INET,
1056     .owner         = THIS_MODULE,
1057     .release       = inet_release,
1058     .bind          = inet_bind,
1059     .connect       = inet_dgram_connect,
1060     .socketpair    = sock_no_socketpair,
1061     .accept        = sock_no_accept,
1062     .getname       = inet_getname,
1063     .poll          = udp_poll,
1064     .ioctl         = inet_ioctl,
1065     .gettstamp     = sock_gettstamp,
1066     .listen        = sock_no_listen,
1067     .shutdown      = inet_shutdown,
1068     .setsockopt    = sock_common_setsockopt,
1069     .getsockopt    = sock_common_getsockopt,
1070     .sendmsg       = inet_sendmsg,
1071     .read_skb      = udp_read_skb,
1072     .recvmsg       = inet_recvmsg,
1073     .mmap          = sock_no_mmap,
1074     .sendpage      = inet_sendpage,
1075     .set_peek_off      = sk_set_peek_off,
1076 #ifdef CONFIG_COMPAT
1077     .compat_ioctl      = inet_compat_ioctl,
1078 #endif
1079 };
1080 EXPORT_SYMBOL(inet_dgram_ops);
1081 
1082 /*
1083  * For SOCK_RAW sockets; should be the same as inet_dgram_ops but without
1084  * udp_poll
1085  */
1086 static const struct proto_ops inet_sockraw_ops = {
1087     .family        = PF_INET,
1088     .owner         = THIS_MODULE,
1089     .release       = inet_release,
1090     .bind          = inet_bind,
1091     .connect       = inet_dgram_connect,
1092     .socketpair    = sock_no_socketpair,
1093     .accept        = sock_no_accept,
1094     .getname       = inet_getname,
1095     .poll          = datagram_poll,
1096     .ioctl         = inet_ioctl,
1097     .gettstamp     = sock_gettstamp,
1098     .listen        = sock_no_listen,
1099     .shutdown      = inet_shutdown,
1100     .setsockopt    = sock_common_setsockopt,
1101     .getsockopt    = sock_common_getsockopt,
1102     .sendmsg       = inet_sendmsg,
1103     .recvmsg       = inet_recvmsg,
1104     .mmap          = sock_no_mmap,
1105     .sendpage      = inet_sendpage,
1106 #ifdef CONFIG_COMPAT
1107     .compat_ioctl      = inet_compat_ioctl,
1108 #endif
1109 };
1110 
1111 static const struct net_proto_family inet_family_ops = {
1112     .family = PF_INET,
1113     .create = inet_create,
1114     .owner  = THIS_MODULE,
1115 };
1116 
1117 /* Upon startup we insert all the elements in inetsw_array[] into
1118  * the linked list inetsw.
1119  */
1120 static struct inet_protosw inetsw_array[] =
1121 {
1122     {
1123         .type =       SOCK_STREAM,
1124         .protocol =   IPPROTO_TCP,
1125         .prot =       &tcp_prot,
1126         .ops =        &inet_stream_ops,
1127         .flags =      INET_PROTOSW_PERMANENT |
1128                   INET_PROTOSW_ICSK,
1129     },
1130 
1131     {
1132         .type =       SOCK_DGRAM,
1133         .protocol =   IPPROTO_UDP,
1134         .prot =       &udp_prot,
1135         .ops =        &inet_dgram_ops,
1136         .flags =      INET_PROTOSW_PERMANENT,
1137        },
1138 
1139        {
1140         .type =       SOCK_DGRAM,
1141         .protocol =   IPPROTO_ICMP,
1142         .prot =       &ping_prot,
1143         .ops =        &inet_sockraw_ops,
1144         .flags =      INET_PROTOSW_REUSE,
1145        },
1146 
1147        {
1148            .type =       SOCK_RAW,
1149            .protocol =   IPPROTO_IP,    /* wild card */
1150            .prot =       &raw_prot,
1151            .ops =        &inet_sockraw_ops,
1152            .flags =      INET_PROTOSW_REUSE,
1153        }
1154 };
1155 
1156 #define INETSW_ARRAY_LEN ARRAY_SIZE(inetsw_array)
1157 
1158 void inet_register_protosw(struct inet_protosw *p)
1159 {
1160     struct list_head *lh;
1161     struct inet_protosw *answer;
1162     int protocol = p->protocol;
1163     struct list_head *last_perm;
1164 
1165     spin_lock_bh(&inetsw_lock);
1166 
1167     if (p->type >= SOCK_MAX)
1168         goto out_illegal;
1169 
1170     /* If we are trying to override a permanent protocol, bail. */
1171     last_perm = &inetsw[p->type];
1172     list_for_each(lh, &inetsw[p->type]) {
1173         answer = list_entry(lh, struct inet_protosw, list);
1174         /* Check only the non-wild match. */
1175         if ((INET_PROTOSW_PERMANENT & answer->flags) == 0)
1176             break;
1177         if (protocol == answer->protocol)
1178             goto out_permanent;
1179         last_perm = lh;
1180     }
1181 
1182     /* Add the new entry after the last permanent entry if any, so that
1183      * the new entry does not override a permanent entry when matched with
1184      * a wild-card protocol. But it is allowed to override any existing
1185      * non-permanent entry.  This means that when we remove this entry, the
1186      * system automatically returns to the old behavior.
1187      */
1188     list_add_rcu(&p->list, last_perm);
1189 out:
1190     spin_unlock_bh(&inetsw_lock);
1191 
1192     return;
1193 
1194 out_permanent:
1195     pr_err("Attempt to override permanent protocol %d\n", protocol);
1196     goto out;
1197 
1198 out_illegal:
1199     pr_err("Ignoring attempt to register invalid socket type %d\n",
1200            p->type);
1201     goto out;
1202 }
1203 EXPORT_SYMBOL(inet_register_protosw);
1204 
1205 void inet_unregister_protosw(struct inet_protosw *p)
1206 {
1207     if (INET_PROTOSW_PERMANENT & p->flags) {
1208         pr_err("Attempt to unregister permanent protocol %d\n",
1209                p->protocol);
1210     } else {
1211         spin_lock_bh(&inetsw_lock);
1212         list_del_rcu(&p->list);
1213         spin_unlock_bh(&inetsw_lock);
1214 
1215         synchronize_net();
1216     }
1217 }
1218 EXPORT_SYMBOL(inet_unregister_protosw);
1219 
1220 static int inet_sk_reselect_saddr(struct sock *sk)
1221 {
1222     struct inet_sock *inet = inet_sk(sk);
1223     __be32 old_saddr = inet->inet_saddr;
1224     __be32 daddr = inet->inet_daddr;
1225     struct flowi4 *fl4;
1226     struct rtable *rt;
1227     __be32 new_saddr;
1228     struct ip_options_rcu *inet_opt;
1229 
1230     inet_opt = rcu_dereference_protected(inet->inet_opt,
1231                          lockdep_sock_is_held(sk));
1232     if (inet_opt && inet_opt->opt.srr)
1233         daddr = inet_opt->opt.faddr;
1234 
1235     /* Query new route. */
1236     fl4 = &inet->cork.fl.u.ip4;
1237     rt = ip_route_connect(fl4, daddr, 0, sk->sk_bound_dev_if,
1238                   sk->sk_protocol, inet->inet_sport,
1239                   inet->inet_dport, sk);
1240     if (IS_ERR(rt))
1241         return PTR_ERR(rt);
1242 
1243     sk_setup_caps(sk, &rt->dst);
1244 
1245     new_saddr = fl4->saddr;
1246 
1247     if (new_saddr == old_saddr)
1248         return 0;
1249 
1250     if (READ_ONCE(sock_net(sk)->ipv4.sysctl_ip_dynaddr) > 1) {
1251         pr_info("%s(): shifting inet->saddr from %pI4 to %pI4\n",
1252             __func__, &old_saddr, &new_saddr);
1253     }
1254 
1255     inet->inet_saddr = inet->inet_rcv_saddr = new_saddr;
1256 
1257     /*
1258      * XXX The only one ugly spot where we need to
1259      * XXX really change the sockets identity after
1260      * XXX it has entered the hashes. -DaveM
1261      *
1262      * Besides that, it does not check for connection
1263      * uniqueness. Wait for troubles.
1264      */
1265     return __sk_prot_rehash(sk);
1266 }
1267 
1268 int inet_sk_rebuild_header(struct sock *sk)
1269 {
1270     struct inet_sock *inet = inet_sk(sk);
1271     struct rtable *rt = (struct rtable *)__sk_dst_check(sk, 0);
1272     __be32 daddr;
1273     struct ip_options_rcu *inet_opt;
1274     struct flowi4 *fl4;
1275     int err;
1276 
1277     /* Route is OK, nothing to do. */
1278     if (rt)
1279         return 0;
1280 
1281     /* Reroute. */
1282     rcu_read_lock();
1283     inet_opt = rcu_dereference(inet->inet_opt);
1284     daddr = inet->inet_daddr;
1285     if (inet_opt && inet_opt->opt.srr)
1286         daddr = inet_opt->opt.faddr;
1287     rcu_read_unlock();
1288     fl4 = &inet->cork.fl.u.ip4;
1289     rt = ip_route_output_ports(sock_net(sk), fl4, sk, daddr, inet->inet_saddr,
1290                    inet->inet_dport, inet->inet_sport,
1291                    sk->sk_protocol, RT_CONN_FLAGS(sk),
1292                    sk->sk_bound_dev_if);
1293     if (!IS_ERR(rt)) {
1294         err = 0;
1295         sk_setup_caps(sk, &rt->dst);
1296     } else {
1297         err = PTR_ERR(rt);
1298 
1299         /* Routing failed... */
1300         sk->sk_route_caps = 0;
1301         /*
1302          * Other protocols have to map its equivalent state to TCP_SYN_SENT.
1303          * DCCP maps its DCCP_REQUESTING state to TCP_SYN_SENT. -acme
1304          */
1305         if (!READ_ONCE(sock_net(sk)->ipv4.sysctl_ip_dynaddr) ||
1306             sk->sk_state != TCP_SYN_SENT ||
1307             (sk->sk_userlocks & SOCK_BINDADDR_LOCK) ||
1308             (err = inet_sk_reselect_saddr(sk)) != 0)
1309             sk->sk_err_soft = -err;
1310     }
1311 
1312     return err;
1313 }
1314 EXPORT_SYMBOL(inet_sk_rebuild_header);
1315 
1316 void inet_sk_set_state(struct sock *sk, int state)
1317 {
1318     trace_inet_sock_set_state(sk, sk->sk_state, state);
1319     sk->sk_state = state;
1320 }
1321 EXPORT_SYMBOL(inet_sk_set_state);
1322 
1323 void inet_sk_state_store(struct sock *sk, int newstate)
1324 {
1325     trace_inet_sock_set_state(sk, sk->sk_state, newstate);
1326     smp_store_release(&sk->sk_state, newstate);
1327 }
1328 
1329 struct sk_buff *inet_gso_segment(struct sk_buff *skb,
1330                  netdev_features_t features)
1331 {
1332     bool udpfrag = false, fixedid = false, gso_partial, encap;
1333     struct sk_buff *segs = ERR_PTR(-EINVAL);
1334     const struct net_offload *ops;
1335     unsigned int offset = 0;
1336     struct iphdr *iph;
1337     int proto, tot_len;
1338     int nhoff;
1339     int ihl;
1340     int id;
1341 
1342     skb_reset_network_header(skb);
1343     nhoff = skb_network_header(skb) - skb_mac_header(skb);
1344     if (unlikely(!pskb_may_pull(skb, sizeof(*iph))))
1345         goto out;
1346 
1347     iph = ip_hdr(skb);
1348     ihl = iph->ihl * 4;
1349     if (ihl < sizeof(*iph))
1350         goto out;
1351 
1352     id = ntohs(iph->id);
1353     proto = iph->protocol;
1354 
1355     /* Warning: after this point, iph might be no longer valid */
1356     if (unlikely(!pskb_may_pull(skb, ihl)))
1357         goto out;
1358     __skb_pull(skb, ihl);
1359 
1360     encap = SKB_GSO_CB(skb)->encap_level > 0;
1361     if (encap)
1362         features &= skb->dev->hw_enc_features;
1363     SKB_GSO_CB(skb)->encap_level += ihl;
1364 
1365     skb_reset_transport_header(skb);
1366 
1367     segs = ERR_PTR(-EPROTONOSUPPORT);
1368 
1369     if (!skb->encapsulation || encap) {
1370         udpfrag = !!(skb_shinfo(skb)->gso_type & SKB_GSO_UDP);
1371         fixedid = !!(skb_shinfo(skb)->gso_type & SKB_GSO_TCP_FIXEDID);
1372 
1373         /* fixed ID is invalid if DF bit is not set */
1374         if (fixedid && !(ip_hdr(skb)->frag_off & htons(IP_DF)))
1375             goto out;
1376     }
1377 
1378     ops = rcu_dereference(inet_offloads[proto]);
1379     if (likely(ops && ops->callbacks.gso_segment)) {
1380         segs = ops->callbacks.gso_segment(skb, features);
1381         if (!segs)
1382             skb->network_header = skb_mac_header(skb) + nhoff - skb->head;
1383     }
1384 
1385     if (IS_ERR_OR_NULL(segs))
1386         goto out;
1387 
1388     gso_partial = !!(skb_shinfo(segs)->gso_type & SKB_GSO_PARTIAL);
1389 
1390     skb = segs;
1391     do {
1392         iph = (struct iphdr *)(skb_mac_header(skb) + nhoff);
1393         if (udpfrag) {
1394             iph->frag_off = htons(offset >> 3);
1395             if (skb->next)
1396                 iph->frag_off |= htons(IP_MF);
1397             offset += skb->len - nhoff - ihl;
1398             tot_len = skb->len - nhoff;
1399         } else if (skb_is_gso(skb)) {
1400             if (!fixedid) {
1401                 iph->id = htons(id);
1402                 id += skb_shinfo(skb)->gso_segs;
1403             }
1404 
1405             if (gso_partial)
1406                 tot_len = skb_shinfo(skb)->gso_size +
1407                       SKB_GSO_CB(skb)->data_offset +
1408                       skb->head - (unsigned char *)iph;
1409             else
1410                 tot_len = skb->len - nhoff;
1411         } else {
1412             if (!fixedid)
1413                 iph->id = htons(id++);
1414             tot_len = skb->len - nhoff;
1415         }
1416         iph->tot_len = htons(tot_len);
1417         ip_send_check(iph);
1418         if (encap)
1419             skb_reset_inner_headers(skb);
1420         skb->network_header = (u8 *)iph - skb->head;
1421         skb_reset_mac_len(skb);
1422     } while ((skb = skb->next));
1423 
1424 out:
1425     return segs;
1426 }
1427 
1428 static struct sk_buff *ipip_gso_segment(struct sk_buff *skb,
1429                     netdev_features_t features)
1430 {
1431     if (!(skb_shinfo(skb)->gso_type & SKB_GSO_IPXIP4))
1432         return ERR_PTR(-EINVAL);
1433 
1434     return inet_gso_segment(skb, features);
1435 }
1436 
1437 struct sk_buff *inet_gro_receive(struct list_head *head, struct sk_buff *skb)
1438 {
1439     const struct net_offload *ops;
1440     struct sk_buff *pp = NULL;
1441     const struct iphdr *iph;
1442     struct sk_buff *p;
1443     unsigned int hlen;
1444     unsigned int off;
1445     unsigned int id;
1446     int flush = 1;
1447     int proto;
1448 
1449     off = skb_gro_offset(skb);
1450     hlen = off + sizeof(*iph);
1451     iph = skb_gro_header_fast(skb, off);
1452     if (skb_gro_header_hard(skb, hlen)) {
1453         iph = skb_gro_header_slow(skb, hlen, off);
1454         if (unlikely(!iph))
1455             goto out;
1456     }
1457 
1458     proto = iph->protocol;
1459 
1460     ops = rcu_dereference(inet_offloads[proto]);
1461     if (!ops || !ops->callbacks.gro_receive)
1462         goto out;
1463 
1464     if (*(u8 *)iph != 0x45)
1465         goto out;
1466 
1467     if (ip_is_fragment(iph))
1468         goto out;
1469 
1470     if (unlikely(ip_fast_csum((u8 *)iph, 5)))
1471         goto out;
1472 
1473     id = ntohl(*(__be32 *)&iph->id);
1474     flush = (u16)((ntohl(*(__be32 *)iph) ^ skb_gro_len(skb)) | (id & ~IP_DF));
1475     id >>= 16;
1476 
1477     list_for_each_entry(p, head, list) {
1478         struct iphdr *iph2;
1479         u16 flush_id;
1480 
1481         if (!NAPI_GRO_CB(p)->same_flow)
1482             continue;
1483 
1484         iph2 = (struct iphdr *)(p->data + off);
1485         /* The above works because, with the exception of the top
1486          * (inner most) layer, we only aggregate pkts with the same
1487          * hdr length so all the hdrs we'll need to verify will start
1488          * at the same offset.
1489          */
1490         if ((iph->protocol ^ iph2->protocol) |
1491             ((__force u32)iph->saddr ^ (__force u32)iph2->saddr) |
1492             ((__force u32)iph->daddr ^ (__force u32)iph2->daddr)) {
1493             NAPI_GRO_CB(p)->same_flow = 0;
1494             continue;
1495         }
1496 
1497         /* All fields must match except length and checksum. */
1498         NAPI_GRO_CB(p)->flush |=
1499             (iph->ttl ^ iph2->ttl) |
1500             (iph->tos ^ iph2->tos) |
1501             ((iph->frag_off ^ iph2->frag_off) & htons(IP_DF));
1502 
1503         NAPI_GRO_CB(p)->flush |= flush;
1504 
1505         /* We need to store of the IP ID check to be included later
1506          * when we can verify that this packet does in fact belong
1507          * to a given flow.
1508          */
1509         flush_id = (u16)(id - ntohs(iph2->id));
1510 
1511         /* This bit of code makes it much easier for us to identify
1512          * the cases where we are doing atomic vs non-atomic IP ID
1513          * checks.  Specifically an atomic check can return IP ID
1514          * values 0 - 0xFFFF, while a non-atomic check can only
1515          * return 0 or 0xFFFF.
1516          */
1517         if (!NAPI_GRO_CB(p)->is_atomic ||
1518             !(iph->frag_off & htons(IP_DF))) {
1519             flush_id ^= NAPI_GRO_CB(p)->count;
1520             flush_id = flush_id ? 0xFFFF : 0;
1521         }
1522 
1523         /* If the previous IP ID value was based on an atomic
1524          * datagram we can overwrite the value and ignore it.
1525          */
1526         if (NAPI_GRO_CB(skb)->is_atomic)
1527             NAPI_GRO_CB(p)->flush_id = flush_id;
1528         else
1529             NAPI_GRO_CB(p)->flush_id |= flush_id;
1530     }
1531 
1532     NAPI_GRO_CB(skb)->is_atomic = !!(iph->frag_off & htons(IP_DF));
1533     NAPI_GRO_CB(skb)->flush |= flush;
1534     skb_set_network_header(skb, off);
1535     /* The above will be needed by the transport layer if there is one
1536      * immediately following this IP hdr.
1537      */
1538 
1539     /* Note : No need to call skb_gro_postpull_rcsum() here,
1540      * as we already checked checksum over ipv4 header was 0
1541      */
1542     skb_gro_pull(skb, sizeof(*iph));
1543     skb_set_transport_header(skb, skb_gro_offset(skb));
1544 
1545     pp = indirect_call_gro_receive(tcp4_gro_receive, udp4_gro_receive,
1546                        ops->callbacks.gro_receive, head, skb);
1547 
1548 out:
1549     skb_gro_flush_final(skb, pp, flush);
1550 
1551     return pp;
1552 }
1553 
1554 static struct sk_buff *ipip_gro_receive(struct list_head *head,
1555                     struct sk_buff *skb)
1556 {
1557     if (NAPI_GRO_CB(skb)->encap_mark) {
1558         NAPI_GRO_CB(skb)->flush = 1;
1559         return NULL;
1560     }
1561 
1562     NAPI_GRO_CB(skb)->encap_mark = 1;
1563 
1564     return inet_gro_receive(head, skb);
1565 }
1566 
1567 #define SECONDS_PER_DAY 86400
1568 
1569 /* inet_current_timestamp - Return IP network timestamp
1570  *
1571  * Return milliseconds since midnight in network byte order.
1572  */
1573 __be32 inet_current_timestamp(void)
1574 {
1575     u32 secs;
1576     u32 msecs;
1577     struct timespec64 ts;
1578 
1579     ktime_get_real_ts64(&ts);
1580 
1581     /* Get secs since midnight. */
1582     (void)div_u64_rem(ts.tv_sec, SECONDS_PER_DAY, &secs);
1583     /* Convert to msecs. */
1584     msecs = secs * MSEC_PER_SEC;
1585     /* Convert nsec to msec. */
1586     msecs += (u32)ts.tv_nsec / NSEC_PER_MSEC;
1587 
1588     /* Convert to network byte order. */
1589     return htonl(msecs);
1590 }
1591 EXPORT_SYMBOL(inet_current_timestamp);
1592 
1593 int inet_recv_error(struct sock *sk, struct msghdr *msg, int len, int *addr_len)
1594 {
1595     if (sk->sk_family == AF_INET)
1596         return ip_recv_error(sk, msg, len, addr_len);
1597 #if IS_ENABLED(CONFIG_IPV6)
1598     if (sk->sk_family == AF_INET6)
1599         return pingv6_ops.ipv6_recv_error(sk, msg, len, addr_len);
1600 #endif
1601     return -EINVAL;
1602 }
1603 
1604 int inet_gro_complete(struct sk_buff *skb, int nhoff)
1605 {
1606     __be16 newlen = htons(skb->len - nhoff);
1607     struct iphdr *iph = (struct iphdr *)(skb->data + nhoff);
1608     const struct net_offload *ops;
1609     int proto = iph->protocol;
1610     int err = -ENOSYS;
1611 
1612     if (skb->encapsulation) {
1613         skb_set_inner_protocol(skb, cpu_to_be16(ETH_P_IP));
1614         skb_set_inner_network_header(skb, nhoff);
1615     }
1616 
1617     csum_replace2(&iph->check, iph->tot_len, newlen);
1618     iph->tot_len = newlen;
1619 
1620     ops = rcu_dereference(inet_offloads[proto]);
1621     if (WARN_ON(!ops || !ops->callbacks.gro_complete))
1622         goto out;
1623 
1624     /* Only need to add sizeof(*iph) to get to the next hdr below
1625      * because any hdr with option will have been flushed in
1626      * inet_gro_receive().
1627      */
1628     err = INDIRECT_CALL_2(ops->callbacks.gro_complete,
1629                   tcp4_gro_complete, udp4_gro_complete,
1630                   skb, nhoff + sizeof(*iph));
1631 
1632 out:
1633     return err;
1634 }
1635 
1636 static int ipip_gro_complete(struct sk_buff *skb, int nhoff)
1637 {
1638     skb->encapsulation = 1;
1639     skb_shinfo(skb)->gso_type |= SKB_GSO_IPXIP4;
1640     return inet_gro_complete(skb, nhoff);
1641 }
1642 
1643 int inet_ctl_sock_create(struct sock **sk, unsigned short family,
1644              unsigned short type, unsigned char protocol,
1645              struct net *net)
1646 {
1647     struct socket *sock;
1648     int rc = sock_create_kern(net, family, type, protocol, &sock);
1649 
1650     if (rc == 0) {
1651         *sk = sock->sk;
1652         (*sk)->sk_allocation = GFP_ATOMIC;
1653         /*
1654          * Unhash it so that IP input processing does not even see it,
1655          * we do not wish this socket to see incoming packets.
1656          */
1657         (*sk)->sk_prot->unhash(*sk);
1658     }
1659     return rc;
1660 }
1661 EXPORT_SYMBOL_GPL(inet_ctl_sock_create);
1662 
1663 unsigned long snmp_fold_field(void __percpu *mib, int offt)
1664 {
1665     unsigned long res = 0;
1666     int i;
1667 
1668     for_each_possible_cpu(i)
1669         res += snmp_get_cpu_field(mib, i, offt);
1670     return res;
1671 }
1672 EXPORT_SYMBOL_GPL(snmp_fold_field);
1673 
1674 #if BITS_PER_LONG==32
1675 
1676 u64 snmp_get_cpu_field64(void __percpu *mib, int cpu, int offt,
1677              size_t syncp_offset)
1678 {
1679     void *bhptr;
1680     struct u64_stats_sync *syncp;
1681     u64 v;
1682     unsigned int start;
1683 
1684     bhptr = per_cpu_ptr(mib, cpu);
1685     syncp = (struct u64_stats_sync *)(bhptr + syncp_offset);
1686     do {
1687         start = u64_stats_fetch_begin_irq(syncp);
1688         v = *(((u64 *)bhptr) + offt);
1689     } while (u64_stats_fetch_retry_irq(syncp, start));
1690 
1691     return v;
1692 }
1693 EXPORT_SYMBOL_GPL(snmp_get_cpu_field64);
1694 
1695 u64 snmp_fold_field64(void __percpu *mib, int offt, size_t syncp_offset)
1696 {
1697     u64 res = 0;
1698     int cpu;
1699 
1700     for_each_possible_cpu(cpu) {
1701         res += snmp_get_cpu_field64(mib, cpu, offt, syncp_offset);
1702     }
1703     return res;
1704 }
1705 EXPORT_SYMBOL_GPL(snmp_fold_field64);
1706 #endif
1707 
1708 #ifdef CONFIG_IP_MULTICAST
1709 static const struct net_protocol igmp_protocol = {
1710     .handler =  igmp_rcv,
1711 };
1712 #endif
1713 
1714 static const struct net_protocol tcp_protocol = {
1715     .handler    =   tcp_v4_rcv,
1716     .err_handler    =   tcp_v4_err,
1717     .no_policy  =   1,
1718     .icmp_strict_tag_validation = 1,
1719 };
1720 
1721 static const struct net_protocol udp_protocol = {
1722     .handler =  udp_rcv,
1723     .err_handler =  udp_err,
1724     .no_policy =    1,
1725 };
1726 
1727 static const struct net_protocol icmp_protocol = {
1728     .handler =  icmp_rcv,
1729     .err_handler =  icmp_err,
1730     .no_policy =    1,
1731 };
1732 
1733 static __net_init int ipv4_mib_init_net(struct net *net)
1734 {
1735     int i;
1736 
1737     net->mib.tcp_statistics = alloc_percpu(struct tcp_mib);
1738     if (!net->mib.tcp_statistics)
1739         goto err_tcp_mib;
1740     net->mib.ip_statistics = alloc_percpu(struct ipstats_mib);
1741     if (!net->mib.ip_statistics)
1742         goto err_ip_mib;
1743 
1744     for_each_possible_cpu(i) {
1745         struct ipstats_mib *af_inet_stats;
1746         af_inet_stats = per_cpu_ptr(net->mib.ip_statistics, i);
1747         u64_stats_init(&af_inet_stats->syncp);
1748     }
1749 
1750     net->mib.net_statistics = alloc_percpu(struct linux_mib);
1751     if (!net->mib.net_statistics)
1752         goto err_net_mib;
1753     net->mib.udp_statistics = alloc_percpu(struct udp_mib);
1754     if (!net->mib.udp_statistics)
1755         goto err_udp_mib;
1756     net->mib.udplite_statistics = alloc_percpu(struct udp_mib);
1757     if (!net->mib.udplite_statistics)
1758         goto err_udplite_mib;
1759     net->mib.icmp_statistics = alloc_percpu(struct icmp_mib);
1760     if (!net->mib.icmp_statistics)
1761         goto err_icmp_mib;
1762     net->mib.icmpmsg_statistics = kzalloc(sizeof(struct icmpmsg_mib),
1763                           GFP_KERNEL);
1764     if (!net->mib.icmpmsg_statistics)
1765         goto err_icmpmsg_mib;
1766 
1767     tcp_mib_init(net);
1768     return 0;
1769 
1770 err_icmpmsg_mib:
1771     free_percpu(net->mib.icmp_statistics);
1772 err_icmp_mib:
1773     free_percpu(net->mib.udplite_statistics);
1774 err_udplite_mib:
1775     free_percpu(net->mib.udp_statistics);
1776 err_udp_mib:
1777     free_percpu(net->mib.net_statistics);
1778 err_net_mib:
1779     free_percpu(net->mib.ip_statistics);
1780 err_ip_mib:
1781     free_percpu(net->mib.tcp_statistics);
1782 err_tcp_mib:
1783     return -ENOMEM;
1784 }
1785 
1786 static __net_exit void ipv4_mib_exit_net(struct net *net)
1787 {
1788     kfree(net->mib.icmpmsg_statistics);
1789     free_percpu(net->mib.icmp_statistics);
1790     free_percpu(net->mib.udplite_statistics);
1791     free_percpu(net->mib.udp_statistics);
1792     free_percpu(net->mib.net_statistics);
1793     free_percpu(net->mib.ip_statistics);
1794     free_percpu(net->mib.tcp_statistics);
1795 #ifdef CONFIG_MPTCP
1796     /* allocated on demand, see mptcp_init_sock() */
1797     free_percpu(net->mib.mptcp_statistics);
1798 #endif
1799 }
1800 
1801 static __net_initdata struct pernet_operations ipv4_mib_ops = {
1802     .init = ipv4_mib_init_net,
1803     .exit = ipv4_mib_exit_net,
1804 };
1805 
1806 static int __init init_ipv4_mibs(void)
1807 {
1808     return register_pernet_subsys(&ipv4_mib_ops);
1809 }
1810 
1811 static __net_init int inet_init_net(struct net *net)
1812 {
1813     /*
1814      * Set defaults for local port range
1815      */
1816     seqlock_init(&net->ipv4.ip_local_ports.lock);
1817     net->ipv4.ip_local_ports.range[0] =  32768;
1818     net->ipv4.ip_local_ports.range[1] =  60999;
1819 
1820     seqlock_init(&net->ipv4.ping_group_range.lock);
1821     /*
1822      * Sane defaults - nobody may create ping sockets.
1823      * Boot scripts should set this to distro-specific group.
1824      */
1825     net->ipv4.ping_group_range.range[0] = make_kgid(&init_user_ns, 1);
1826     net->ipv4.ping_group_range.range[1] = make_kgid(&init_user_ns, 0);
1827 
1828     /* Default values for sysctl-controlled parameters.
1829      * We set them here, in case sysctl is not compiled.
1830      */
1831     net->ipv4.sysctl_ip_default_ttl = IPDEFTTL;
1832     net->ipv4.sysctl_ip_fwd_update_priority = 1;
1833     net->ipv4.sysctl_ip_dynaddr = 0;
1834     net->ipv4.sysctl_ip_early_demux = 1;
1835     net->ipv4.sysctl_udp_early_demux = 1;
1836     net->ipv4.sysctl_tcp_early_demux = 1;
1837     net->ipv4.sysctl_nexthop_compat_mode = 1;
1838 #ifdef CONFIG_SYSCTL
1839     net->ipv4.sysctl_ip_prot_sock = PROT_SOCK;
1840 #endif
1841 
1842     /* Some igmp sysctl, whose values are always used */
1843     net->ipv4.sysctl_igmp_max_memberships = 20;
1844     net->ipv4.sysctl_igmp_max_msf = 10;
1845     /* IGMP reports for link-local multicast groups are enabled by default */
1846     net->ipv4.sysctl_igmp_llm_reports = 1;
1847     net->ipv4.sysctl_igmp_qrv = 2;
1848 
1849     net->ipv4.sysctl_fib_notify_on_flag_change = 0;
1850 
1851     return 0;
1852 }
1853 
1854 static __net_initdata struct pernet_operations af_inet_ops = {
1855     .init = inet_init_net,
1856 };
1857 
1858 static int __init init_inet_pernet_ops(void)
1859 {
1860     return register_pernet_subsys(&af_inet_ops);
1861 }
1862 
1863 static int ipv4_proc_init(void);
1864 
1865 /*
1866  *  IP protocol layer initialiser
1867  */
1868 
1869 static struct packet_offload ip_packet_offload __read_mostly = {
1870     .type = cpu_to_be16(ETH_P_IP),
1871     .callbacks = {
1872         .gso_segment = inet_gso_segment,
1873         .gro_receive = inet_gro_receive,
1874         .gro_complete = inet_gro_complete,
1875     },
1876 };
1877 
1878 static const struct net_offload ipip_offload = {
1879     .callbacks = {
1880         .gso_segment    = ipip_gso_segment,
1881         .gro_receive    = ipip_gro_receive,
1882         .gro_complete   = ipip_gro_complete,
1883     },
1884 };
1885 
1886 static int __init ipip_offload_init(void)
1887 {
1888     return inet_add_offload(&ipip_offload, IPPROTO_IPIP);
1889 }
1890 
1891 static int __init ipv4_offload_init(void)
1892 {
1893     /*
1894      * Add offloads
1895      */
1896     if (udpv4_offload_init() < 0)
1897         pr_crit("%s: Cannot add UDP protocol offload\n", __func__);
1898     if (tcpv4_offload_init() < 0)
1899         pr_crit("%s: Cannot add TCP protocol offload\n", __func__);
1900     if (ipip_offload_init() < 0)
1901         pr_crit("%s: Cannot add IPIP protocol offload\n", __func__);
1902 
1903     dev_add_offload(&ip_packet_offload);
1904     return 0;
1905 }
1906 
1907 fs_initcall(ipv4_offload_init);
1908 
1909 static struct packet_type ip_packet_type __read_mostly = {
1910     .type = cpu_to_be16(ETH_P_IP),
1911     .func = ip_rcv,
1912     .list_func = ip_list_rcv,
1913 };
1914 
1915 static int __init inet_init(void)
1916 {
1917     struct inet_protosw *q;
1918     struct list_head *r;
1919     int rc;
1920 
1921     sock_skb_cb_check_size(sizeof(struct inet_skb_parm));
1922 
1923     raw_hashinfo_init(&raw_v4_hashinfo);
1924 
1925     rc = proto_register(&tcp_prot, 1);
1926     if (rc)
1927         goto out;
1928 
1929     rc = proto_register(&udp_prot, 1);
1930     if (rc)
1931         goto out_unregister_tcp_proto;
1932 
1933     rc = proto_register(&raw_prot, 1);
1934     if (rc)
1935         goto out_unregister_udp_proto;
1936 
1937     rc = proto_register(&ping_prot, 1);
1938     if (rc)
1939         goto out_unregister_raw_proto;
1940 
1941     /*
1942      *  Tell SOCKET that we are alive...
1943      */
1944 
1945     (void)sock_register(&inet_family_ops);
1946 
1947 #ifdef CONFIG_SYSCTL
1948     ip_static_sysctl_init();
1949 #endif
1950 
1951     /*
1952      *  Add all the base protocols.
1953      */
1954 
1955     if (inet_add_protocol(&icmp_protocol, IPPROTO_ICMP) < 0)
1956         pr_crit("%s: Cannot add ICMP protocol\n", __func__);
1957     if (inet_add_protocol(&udp_protocol, IPPROTO_UDP) < 0)
1958         pr_crit("%s: Cannot add UDP protocol\n", __func__);
1959     if (inet_add_protocol(&tcp_protocol, IPPROTO_TCP) < 0)
1960         pr_crit("%s: Cannot add TCP protocol\n", __func__);
1961 #ifdef CONFIG_IP_MULTICAST
1962     if (inet_add_protocol(&igmp_protocol, IPPROTO_IGMP) < 0)
1963         pr_crit("%s: Cannot add IGMP protocol\n", __func__);
1964 #endif
1965 
1966     /* Register the socket-side information for inet_create. */
1967     for (r = &inetsw[0]; r < &inetsw[SOCK_MAX]; ++r)
1968         INIT_LIST_HEAD(r);
1969 
1970     for (q = inetsw_array; q < &inetsw_array[INETSW_ARRAY_LEN]; ++q)
1971         inet_register_protosw(q);
1972 
1973     /*
1974      *  Set the ARP module up
1975      */
1976 
1977     arp_init();
1978 
1979     /*
1980      *  Set the IP module up
1981      */
1982 
1983     ip_init();
1984 
1985     /* Initialise per-cpu ipv4 mibs */
1986     if (init_ipv4_mibs())
1987         panic("%s: Cannot init ipv4 mibs\n", __func__);
1988 
1989     /* Setup TCP slab cache for open requests. */
1990     tcp_init();
1991 
1992     /* Setup UDP memory threshold */
1993     udp_init();
1994 
1995     /* Add UDP-Lite (RFC 3828) */
1996     udplite4_register();
1997 
1998     raw_init();
1999 
2000     ping_init();
2001 
2002     /*
2003      *  Set the ICMP layer up
2004      */
2005 
2006     if (icmp_init() < 0)
2007         panic("Failed to create the ICMP control socket.\n");
2008 
2009     /*
2010      *  Initialise the multicast router
2011      */
2012 #if defined(CONFIG_IP_MROUTE)
2013     if (ip_mr_init())
2014         pr_crit("%s: Cannot init ipv4 mroute\n", __func__);
2015 #endif
2016 
2017     if (init_inet_pernet_ops())
2018         pr_crit("%s: Cannot init ipv4 inet pernet ops\n", __func__);
2019 
2020     ipv4_proc_init();
2021 
2022     ipfrag_init();
2023 
2024     dev_add_pack(&ip_packet_type);
2025 
2026     ip_tunnel_core_init();
2027 
2028     rc = 0;
2029 out:
2030     return rc;
2031 out_unregister_raw_proto:
2032     proto_unregister(&raw_prot);
2033 out_unregister_udp_proto:
2034     proto_unregister(&udp_prot);
2035 out_unregister_tcp_proto:
2036     proto_unregister(&tcp_prot);
2037     goto out;
2038 }
2039 
2040 fs_initcall(inet_init);
2041 
2042 /* ------------------------------------------------------------------------ */
2043 
2044 #ifdef CONFIG_PROC_FS
2045 static int __init ipv4_proc_init(void)
2046 {
2047     int rc = 0;
2048 
2049     if (raw_proc_init())
2050         goto out_raw;
2051     if (tcp4_proc_init())
2052         goto out_tcp;
2053     if (udp4_proc_init())
2054         goto out_udp;
2055     if (ping_proc_init())
2056         goto out_ping;
2057     if (ip_misc_proc_init())
2058         goto out_misc;
2059 out:
2060     return rc;
2061 out_misc:
2062     ping_proc_exit();
2063 out_ping:
2064     udp4_proc_exit();
2065 out_udp:
2066     tcp4_proc_exit();
2067 out_tcp:
2068     raw_proc_exit();
2069 out_raw:
2070     rc = -ENOMEM;
2071     goto out;
2072 }
2073 
2074 #else /* CONFIG_PROC_FS */
2075 static int __init ipv4_proc_init(void)
2076 {
2077     return 0;
2078 }
2079 #endif /* CONFIG_PROC_FS */
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