11da177e4SLinus Torvalds /* 21da177e4SLinus Torvalds * INET An implementation of the TCP/IP protocol suite for the LINUX 31da177e4SLinus Torvalds * operating system. INET is implemented using the BSD Socket 41da177e4SLinus Torvalds * interface as the means of communication with the user level. 51da177e4SLinus Torvalds * 61da177e4SLinus Torvalds * PF_INET protocol family socket handler. 71da177e4SLinus Torvalds * 802c30a84SJesper Juhl * Authors: Ross Biro 91da177e4SLinus Torvalds * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG> 101da177e4SLinus Torvalds * Florian La Roche, <flla@stud.uni-sb.de> 111da177e4SLinus Torvalds * Alan Cox, <A.Cox@swansea.ac.uk> 121da177e4SLinus Torvalds * 131da177e4SLinus Torvalds * Changes (see also sock.c) 141da177e4SLinus Torvalds * 151da177e4SLinus Torvalds * piggy, 161da177e4SLinus Torvalds * Karl Knutson : Socket protocol table 171da177e4SLinus Torvalds * A.N.Kuznetsov : Socket death error in accept(). 181da177e4SLinus Torvalds * John Richardson : Fix non blocking error in connect() 191da177e4SLinus Torvalds * so sockets that fail to connect 201da177e4SLinus Torvalds * don't return -EINPROGRESS. 211da177e4SLinus Torvalds * Alan Cox : Asynchronous I/O support 221da177e4SLinus Torvalds * Alan Cox : Keep correct socket pointer on sock 231da177e4SLinus Torvalds * structures 241da177e4SLinus Torvalds * when accept() ed 251da177e4SLinus Torvalds * Alan Cox : Semantics of SO_LINGER aren't state 261da177e4SLinus Torvalds * moved to close when you look carefully. 271da177e4SLinus Torvalds * With this fixed and the accept bug fixed 281da177e4SLinus Torvalds * some RPC stuff seems happier. 291da177e4SLinus Torvalds * Niibe Yutaka : 4.4BSD style write async I/O 301da177e4SLinus Torvalds * Alan Cox, 311da177e4SLinus Torvalds * Tony Gale : Fixed reuse semantics. 321da177e4SLinus Torvalds * Alan Cox : bind() shouldn't abort existing but dead 331da177e4SLinus Torvalds * sockets. Stops FTP netin:.. I hope. 341da177e4SLinus Torvalds * Alan Cox : bind() works correctly for RAW sockets. 351da177e4SLinus Torvalds * Note that FreeBSD at least was broken 361da177e4SLinus Torvalds * in this respect so be careful with 371da177e4SLinus Torvalds * compatibility tests... 381da177e4SLinus Torvalds * Alan Cox : routing cache support 391da177e4SLinus Torvalds * Alan Cox : memzero the socket structure for 401da177e4SLinus Torvalds * compactness. 411da177e4SLinus Torvalds * Matt Day : nonblock connect error handler 421da177e4SLinus Torvalds * Alan Cox : Allow large numbers of pending sockets 431da177e4SLinus Torvalds * (eg for big web sites), but only if 441da177e4SLinus Torvalds * specifically application requested. 451da177e4SLinus Torvalds * Alan Cox : New buffering throughout IP. Used 461da177e4SLinus Torvalds * dumbly. 471da177e4SLinus Torvalds * Alan Cox : New buffering now used smartly. 481da177e4SLinus Torvalds * Alan Cox : BSD rather than common sense 491da177e4SLinus Torvalds * interpretation of listen. 501da177e4SLinus Torvalds * Germano Caronni : Assorted small races. 511da177e4SLinus Torvalds * Alan Cox : sendmsg/recvmsg basic support. 521da177e4SLinus Torvalds * Alan Cox : Only sendmsg/recvmsg now supported. 531da177e4SLinus Torvalds * Alan Cox : Locked down bind (see security list). 541da177e4SLinus Torvalds * Alan Cox : Loosened bind a little. 551da177e4SLinus Torvalds * Mike McLagan : ADD/DEL DLCI Ioctls 561da177e4SLinus Torvalds * Willy Konynenberg : Transparent proxying support. 571da177e4SLinus Torvalds * David S. Miller : New socket lookup architecture. 581da177e4SLinus Torvalds * Some other random speedups. 591da177e4SLinus Torvalds * Cyrus Durgin : Cleaned up file for kmod hacks. 601da177e4SLinus Torvalds * Andi Kleen : Fix inet_stream_connect TCP race. 611da177e4SLinus Torvalds * 621da177e4SLinus Torvalds * This program is free software; you can redistribute it and/or 631da177e4SLinus Torvalds * modify it under the terms of the GNU General Public License 641da177e4SLinus Torvalds * as published by the Free Software Foundation; either version 651da177e4SLinus Torvalds * 2 of the License, or (at your option) any later version. 661da177e4SLinus Torvalds */ 671da177e4SLinus Torvalds 68afd46503SJoe Perches #define pr_fmt(fmt) "IPv4: " fmt 69afd46503SJoe Perches 70f4c50d99SHerbert Xu #include <linux/err.h> 711da177e4SLinus Torvalds #include <linux/errno.h> 721da177e4SLinus Torvalds #include <linux/types.h> 731da177e4SLinus Torvalds #include <linux/socket.h> 741da177e4SLinus Torvalds #include <linux/in.h> 751da177e4SLinus Torvalds #include <linux/kernel.h> 761da177e4SLinus Torvalds #include <linux/module.h> 771da177e4SLinus Torvalds #include <linux/sched.h> 781da177e4SLinus Torvalds #include <linux/timer.h> 791da177e4SLinus Torvalds #include <linux/string.h> 801da177e4SLinus Torvalds #include <linux/sockios.h> 811da177e4SLinus Torvalds #include <linux/net.h> 824fc268d2SRandy Dunlap #include <linux/capability.h> 831da177e4SLinus Torvalds #include <linux/fcntl.h> 841da177e4SLinus Torvalds #include <linux/mm.h> 851da177e4SLinus Torvalds #include <linux/interrupt.h> 861da177e4SLinus Torvalds #include <linux/stat.h> 871da177e4SLinus Torvalds #include <linux/init.h> 881da177e4SLinus Torvalds #include <linux/poll.h> 891da177e4SLinus Torvalds #include <linux/netfilter_ipv4.h> 90b3da2cf3SDavid S. Miller #include <linux/random.h> 915a0e3ad6STejun Heo #include <linux/slab.h> 921da177e4SLinus Torvalds 931da177e4SLinus Torvalds #include <asm/uaccess.h> 941da177e4SLinus Torvalds 951da177e4SLinus Torvalds #include <linux/inet.h> 961da177e4SLinus Torvalds #include <linux/igmp.h> 9714c85021SArnaldo Carvalho de Melo #include <linux/inetdevice.h> 981da177e4SLinus Torvalds #include <linux/netdevice.h> 9973cc19f1SHerbert Xu #include <net/checksum.h> 1001da177e4SLinus Torvalds #include <net/ip.h> 1011da177e4SLinus Torvalds #include <net/protocol.h> 1021da177e4SLinus Torvalds #include <net/arp.h> 1031da177e4SLinus Torvalds #include <net/route.h> 1041da177e4SLinus Torvalds #include <net/ip_fib.h> 105295f7324SArnaldo Carvalho de Melo #include <net/inet_connection_sock.h> 1061da177e4SLinus Torvalds #include <net/tcp.h> 1071da177e4SLinus Torvalds #include <net/udp.h> 108ba4e58ecSGerrit Renker #include <net/udplite.h> 109c319b4d7SVasiliy Kulikov #include <net/ping.h> 1101da177e4SLinus Torvalds #include <linux/skbuff.h> 1111da177e4SLinus Torvalds #include <net/sock.h> 1121da177e4SLinus Torvalds #include <net/raw.h> 1131da177e4SLinus Torvalds #include <net/icmp.h> 1141da177e4SLinus Torvalds #include <net/inet_common.h> 1151da177e4SLinus Torvalds #include <net/xfrm.h> 1169b4661bdSPavel Emelyanov #include <net/net_namespace.h> 117aebda156SEric Dumazet #include <net/secure_seq.h> 1181da177e4SLinus Torvalds #ifdef CONFIG_IP_MROUTE 1191da177e4SLinus Torvalds #include <linux/mroute.h> 1201da177e4SLinus Torvalds #endif 1211da177e4SLinus Torvalds 1221da177e4SLinus Torvalds 1231da177e4SLinus Torvalds /* The inetsw table contains everything that inet_create needs to 1241da177e4SLinus Torvalds * build a new socket. 1251da177e4SLinus Torvalds */ 1261da177e4SLinus Torvalds static struct list_head inetsw[SOCK_MAX]; 1271da177e4SLinus Torvalds static DEFINE_SPINLOCK(inetsw_lock); 1281da177e4SLinus Torvalds 1291da177e4SLinus Torvalds /* New destruction routine */ 1301da177e4SLinus Torvalds 1311da177e4SLinus Torvalds void inet_sock_destruct(struct sock *sk) 1321da177e4SLinus Torvalds { 1331da177e4SLinus Torvalds struct inet_sock *inet = inet_sk(sk); 1341da177e4SLinus Torvalds 1351da177e4SLinus Torvalds __skb_queue_purge(&sk->sk_receive_queue); 1361da177e4SLinus Torvalds __skb_queue_purge(&sk->sk_error_queue); 1371da177e4SLinus Torvalds 13895766fffSHideo Aoki sk_mem_reclaim(sk); 13995766fffSHideo Aoki 1401da177e4SLinus Torvalds if (sk->sk_type == SOCK_STREAM && sk->sk_state != TCP_CLOSE) { 1413d1427f8SEric Dumazet pr_err("Attempt to release TCP socket in state %d %p\n", 1421da177e4SLinus Torvalds sk->sk_state, sk); 1431da177e4SLinus Torvalds return; 1441da177e4SLinus Torvalds } 1451da177e4SLinus Torvalds if (!sock_flag(sk, SOCK_DEAD)) { 1463d1427f8SEric Dumazet pr_err("Attempt to release alive inet socket %p\n", sk); 1471da177e4SLinus Torvalds return; 1481da177e4SLinus Torvalds } 1491da177e4SLinus Torvalds 150547b792cSIlpo Järvinen WARN_ON(atomic_read(&sk->sk_rmem_alloc)); 151547b792cSIlpo Järvinen WARN_ON(atomic_read(&sk->sk_wmem_alloc)); 152547b792cSIlpo Järvinen WARN_ON(sk->sk_wmem_queued); 153547b792cSIlpo Järvinen WARN_ON(sk->sk_forward_alloc); 1541da177e4SLinus Torvalds 155f6d8bd05SEric Dumazet kfree(rcu_dereference_protected(inet->inet_opt, 1)); 156b6c6712aSEric Dumazet dst_release(rcu_dereference_check(sk->sk_dst_cache, 1)); 15741063e9dSDavid S. Miller dst_release(sk->sk_rx_dst); 158e6848976SArnaldo Carvalho de Melo sk_refcnt_debug_dec(sk); 1591da177e4SLinus Torvalds } 1603d1427f8SEric Dumazet EXPORT_SYMBOL(inet_sock_destruct); 1611da177e4SLinus Torvalds 1621da177e4SLinus Torvalds /* 1631da177e4SLinus Torvalds * The routines beyond this point handle the behaviour of an AF_INET 1641da177e4SLinus Torvalds * socket object. Mostly it punts to the subprotocols of IP to do 1651da177e4SLinus Torvalds * the work. 1661da177e4SLinus Torvalds */ 1671da177e4SLinus Torvalds 1681da177e4SLinus Torvalds /* 1691da177e4SLinus Torvalds * Automatically bind an unbound socket. 1701da177e4SLinus Torvalds */ 1711da177e4SLinus Torvalds 1721da177e4SLinus Torvalds static int inet_autobind(struct sock *sk) 1731da177e4SLinus Torvalds { 1741da177e4SLinus Torvalds struct inet_sock *inet; 1751da177e4SLinus Torvalds /* We may need to bind the socket. */ 1761da177e4SLinus Torvalds lock_sock(sk); 1771da177e4SLinus Torvalds inet = inet_sk(sk); 178c720c7e8SEric Dumazet if (!inet->inet_num) { 1791da177e4SLinus Torvalds if (sk->sk_prot->get_port(sk, 0)) { 1801da177e4SLinus Torvalds release_sock(sk); 1811da177e4SLinus Torvalds return -EAGAIN; 1821da177e4SLinus Torvalds } 183c720c7e8SEric Dumazet inet->inet_sport = htons(inet->inet_num); 1841da177e4SLinus Torvalds } 1851da177e4SLinus Torvalds release_sock(sk); 1861da177e4SLinus Torvalds return 0; 1871da177e4SLinus Torvalds } 1881da177e4SLinus Torvalds 1891da177e4SLinus Torvalds /* 1901da177e4SLinus Torvalds * Move a socket into listening state. 1911da177e4SLinus Torvalds */ 1921da177e4SLinus Torvalds int inet_listen(struct socket *sock, int backlog) 1931da177e4SLinus Torvalds { 1941da177e4SLinus Torvalds struct sock *sk = sock->sk; 1951da177e4SLinus Torvalds unsigned char old_state; 1961da177e4SLinus Torvalds int err; 1971da177e4SLinus Torvalds 1981da177e4SLinus Torvalds lock_sock(sk); 1991da177e4SLinus Torvalds 2001da177e4SLinus Torvalds err = -EINVAL; 2011da177e4SLinus Torvalds if (sock->state != SS_UNCONNECTED || sock->type != SOCK_STREAM) 2021da177e4SLinus Torvalds goto out; 2031da177e4SLinus Torvalds 2041da177e4SLinus Torvalds old_state = sk->sk_state; 2051da177e4SLinus Torvalds if (!((1 << old_state) & (TCPF_CLOSE | TCPF_LISTEN))) 2061da177e4SLinus Torvalds goto out; 2071da177e4SLinus Torvalds 2081da177e4SLinus Torvalds /* Really, if the socket is already in listen state 2091da177e4SLinus Torvalds * we can only allow the backlog to be adjusted. 2101da177e4SLinus Torvalds */ 2111da177e4SLinus Torvalds if (old_state != TCP_LISTEN) { 2128336886fSJerry Chu /* Check special setups for testing purpose to enable TFO w/o 2138336886fSJerry Chu * requiring TCP_FASTOPEN sockopt. 2148336886fSJerry Chu * Note that only TCP sockets (SOCK_STREAM) will reach here. 2158336886fSJerry Chu * Also fastopenq may already been allocated because this 2168336886fSJerry Chu * socket was in TCP_LISTEN state previously but was 2178336886fSJerry Chu * shutdown() (rather than close()). 2188336886fSJerry Chu */ 2198336886fSJerry Chu if ((sysctl_tcp_fastopen & TFO_SERVER_ENABLE) != 0 && 22051456b29SIan Morris !inet_csk(sk)->icsk_accept_queue.fastopenq) { 2218336886fSJerry Chu if ((sysctl_tcp_fastopen & TFO_SERVER_WO_SOCKOPT1) != 0) 2228336886fSJerry Chu err = fastopen_init_queue(sk, backlog); 2238336886fSJerry Chu else if ((sysctl_tcp_fastopen & 2248336886fSJerry Chu TFO_SERVER_WO_SOCKOPT2) != 0) 2258336886fSJerry Chu err = fastopen_init_queue(sk, 2268336886fSJerry Chu ((uint)sysctl_tcp_fastopen) >> 16); 2278336886fSJerry Chu else 2288336886fSJerry Chu err = 0; 2298336886fSJerry Chu if (err) 2308336886fSJerry Chu goto out; 2318336886fSJerry Chu } 23272a3effaSEric Dumazet err = inet_csk_listen_start(sk, backlog); 2331da177e4SLinus Torvalds if (err) 2341da177e4SLinus Torvalds goto out; 2351da177e4SLinus Torvalds } 2361da177e4SLinus Torvalds sk->sk_max_ack_backlog = backlog; 2371da177e4SLinus Torvalds err = 0; 2381da177e4SLinus Torvalds 2391da177e4SLinus Torvalds out: 2401da177e4SLinus Torvalds release_sock(sk); 2411da177e4SLinus Torvalds return err; 2421da177e4SLinus Torvalds } 2433d1427f8SEric Dumazet EXPORT_SYMBOL(inet_listen); 2441da177e4SLinus Torvalds 2451da177e4SLinus Torvalds /* 2461da177e4SLinus Torvalds * Create an inet socket. 2471da177e4SLinus Torvalds */ 2481da177e4SLinus Torvalds 2493f378b68SEric Paris static int inet_create(struct net *net, struct socket *sock, int protocol, 2503f378b68SEric Paris int kern) 2511da177e4SLinus Torvalds { 2521da177e4SLinus Torvalds struct sock *sk; 2531da177e4SLinus Torvalds struct inet_protosw *answer; 2541da177e4SLinus Torvalds struct inet_sock *inet; 2551da177e4SLinus Torvalds struct proto *answer_prot; 2561da177e4SLinus Torvalds unsigned char answer_flags; 257bb97d31fSArnaldo Carvalho de Melo int try_loading_module = 0; 25886c8f9d1SHerbert Xu int err; 2591da177e4SLinus Torvalds 2601da177e4SLinus Torvalds sock->state = SS_UNCONNECTED; 2611da177e4SLinus Torvalds 2621da177e4SLinus Torvalds /* Look for the requested type/protocol pair. */ 263bb97d31fSArnaldo Carvalho de Melo lookup_protocol: 26486c8f9d1SHerbert Xu err = -ESOCKTNOSUPPORT; 2651da177e4SLinus Torvalds rcu_read_lock(); 266696adfe8SPaul E. McKenney list_for_each_entry_rcu(answer, &inetsw[sock->type], list) { 2671da177e4SLinus Torvalds 268696adfe8SPaul E. McKenney err = 0; 2691da177e4SLinus Torvalds /* Check the non-wild match. */ 2701da177e4SLinus Torvalds if (protocol == answer->protocol) { 2711da177e4SLinus Torvalds if (protocol != IPPROTO_IP) 2721da177e4SLinus Torvalds break; 2731da177e4SLinus Torvalds } else { 2741da177e4SLinus Torvalds /* Check for the two wild cases. */ 2751da177e4SLinus Torvalds if (IPPROTO_IP == protocol) { 2761da177e4SLinus Torvalds protocol = answer->protocol; 2771da177e4SLinus Torvalds break; 2781da177e4SLinus Torvalds } 2791da177e4SLinus Torvalds if (IPPROTO_IP == answer->protocol) 2801da177e4SLinus Torvalds break; 2811da177e4SLinus Torvalds } 28286c8f9d1SHerbert Xu err = -EPROTONOSUPPORT; 2831da177e4SLinus Torvalds } 2841da177e4SLinus Torvalds 285696adfe8SPaul E. McKenney if (unlikely(err)) { 286bb97d31fSArnaldo Carvalho de Melo if (try_loading_module < 2) { 287bb97d31fSArnaldo Carvalho de Melo rcu_read_unlock(); 288bb97d31fSArnaldo Carvalho de Melo /* 289bb97d31fSArnaldo Carvalho de Melo * Be more specific, e.g. net-pf-2-proto-132-type-1 290bb97d31fSArnaldo Carvalho de Melo * (net-pf-PF_INET-proto-IPPROTO_SCTP-type-SOCK_STREAM) 291bb97d31fSArnaldo Carvalho de Melo */ 292bb97d31fSArnaldo Carvalho de Melo if (++try_loading_module == 1) 293bb97d31fSArnaldo Carvalho de Melo request_module("net-pf-%d-proto-%d-type-%d", 294bb97d31fSArnaldo Carvalho de Melo PF_INET, protocol, sock->type); 295bb97d31fSArnaldo Carvalho de Melo /* 296bb97d31fSArnaldo Carvalho de Melo * Fall back to generic, e.g. net-pf-2-proto-132 297bb97d31fSArnaldo Carvalho de Melo * (net-pf-PF_INET-proto-IPPROTO_SCTP) 298bb97d31fSArnaldo Carvalho de Melo */ 299bb97d31fSArnaldo Carvalho de Melo else 300bb97d31fSArnaldo Carvalho de Melo request_module("net-pf-%d-proto-%d", 301bb97d31fSArnaldo Carvalho de Melo PF_INET, protocol); 302bb97d31fSArnaldo Carvalho de Melo goto lookup_protocol; 303bb97d31fSArnaldo Carvalho de Melo } else 3041da177e4SLinus Torvalds goto out_rcu_unlock; 305bb97d31fSArnaldo Carvalho de Melo } 306bb97d31fSArnaldo Carvalho de Melo 3071da177e4SLinus Torvalds err = -EPERM; 30852e804c6SEric W. Biederman if (sock->type == SOCK_RAW && !kern && 30952e804c6SEric W. Biederman !ns_capable(net->user_ns, CAP_NET_RAW)) 3101da177e4SLinus Torvalds goto out_rcu_unlock; 3111da177e4SLinus Torvalds 3121da177e4SLinus Torvalds sock->ops = answer->ops; 3131da177e4SLinus Torvalds answer_prot = answer->prot; 3141da177e4SLinus Torvalds answer_flags = answer->flags; 3151da177e4SLinus Torvalds rcu_read_unlock(); 3161da177e4SLinus Torvalds 31751456b29SIan Morris WARN_ON(!answer_prot->slab); 3181da177e4SLinus Torvalds 3191da177e4SLinus Torvalds err = -ENOBUFS; 32011aa9c28SEric W. Biederman sk = sk_alloc(net, PF_INET, GFP_KERNEL, answer_prot, kern); 32151456b29SIan Morris if (!sk) 3221da177e4SLinus Torvalds goto out; 3231da177e4SLinus Torvalds 3241da177e4SLinus Torvalds err = 0; 3251da177e4SLinus Torvalds if (INET_PROTOSW_REUSE & answer_flags) 3264a17fd52SPavel Emelyanov sk->sk_reuse = SK_CAN_REUSE; 3271da177e4SLinus Torvalds 3281da177e4SLinus Torvalds inet = inet_sk(sk); 329469de9b9SPaul Moore inet->is_icsk = (INET_PROTOSW_ICSK & answer_flags) != 0; 3301da177e4SLinus Torvalds 3317b2ff18eSJiri Olsa inet->nodefrag = 0; 3327b2ff18eSJiri Olsa 3331da177e4SLinus Torvalds if (SOCK_RAW == sock->type) { 334c720c7e8SEric Dumazet inet->inet_num = protocol; 3351da177e4SLinus Torvalds if (IPPROTO_RAW == protocol) 3361da177e4SLinus Torvalds inet->hdrincl = 1; 3371da177e4SLinus Torvalds } 3381da177e4SLinus Torvalds 339974eda11SHannes Frederic Sowa if (net->ipv4.sysctl_ip_no_pmtu_disc) 3401da177e4SLinus Torvalds inet->pmtudisc = IP_PMTUDISC_DONT; 3411da177e4SLinus Torvalds else 3421da177e4SLinus Torvalds inet->pmtudisc = IP_PMTUDISC_WANT; 3431da177e4SLinus Torvalds 344c720c7e8SEric Dumazet inet->inet_id = 0; 3451da177e4SLinus Torvalds 3461da177e4SLinus Torvalds sock_init_data(sock, sk); 3471da177e4SLinus Torvalds 3481da177e4SLinus Torvalds sk->sk_destruct = inet_sock_destruct; 3491da177e4SLinus Torvalds sk->sk_protocol = protocol; 3501da177e4SLinus Torvalds sk->sk_backlog_rcv = sk->sk_prot->backlog_rcv; 3511da177e4SLinus Torvalds 3521da177e4SLinus Torvalds inet->uc_ttl = -1; 3531da177e4SLinus Torvalds inet->mc_loop = 1; 3541da177e4SLinus Torvalds inet->mc_ttl = 1; 355f771bef9SNivedita Singhvi inet->mc_all = 1; 3561da177e4SLinus Torvalds inet->mc_index = 0; 3571da177e4SLinus Torvalds inet->mc_list = NULL; 3584c507d28SJiri Benc inet->rcv_tos = 0; 3591da177e4SLinus Torvalds 360e6848976SArnaldo Carvalho de Melo sk_refcnt_debug_inc(sk); 3611da177e4SLinus Torvalds 362c720c7e8SEric Dumazet if (inet->inet_num) { 3631da177e4SLinus Torvalds /* It assumes that any protocol which allows 3641da177e4SLinus Torvalds * the user to assign a number at socket 3651da177e4SLinus Torvalds * creation time automatically 3661da177e4SLinus Torvalds * shares. 3671da177e4SLinus Torvalds */ 368c720c7e8SEric Dumazet inet->inet_sport = htons(inet->inet_num); 3691da177e4SLinus Torvalds /* Add to protocol hash chains. */ 3701da177e4SLinus Torvalds sk->sk_prot->hash(sk); 3711da177e4SLinus Torvalds } 3721da177e4SLinus Torvalds 3731da177e4SLinus Torvalds if (sk->sk_prot->init) { 3741da177e4SLinus Torvalds err = sk->sk_prot->init(sk); 3751da177e4SLinus Torvalds if (err) 3761da177e4SLinus Torvalds sk_common_release(sk); 3771da177e4SLinus Torvalds } 3781da177e4SLinus Torvalds out: 3791da177e4SLinus Torvalds return err; 3801da177e4SLinus Torvalds out_rcu_unlock: 3811da177e4SLinus Torvalds rcu_read_unlock(); 3821da177e4SLinus Torvalds goto out; 3831da177e4SLinus Torvalds } 3841da177e4SLinus Torvalds 3851da177e4SLinus Torvalds 3861da177e4SLinus Torvalds /* 3871da177e4SLinus Torvalds * The peer socket should always be NULL (or else). When we call this 3881da177e4SLinus Torvalds * function we are destroying the object and from then on nobody 3891da177e4SLinus Torvalds * should refer to it. 3901da177e4SLinus Torvalds */ 3911da177e4SLinus Torvalds int inet_release(struct socket *sock) 3921da177e4SLinus Torvalds { 3931da177e4SLinus Torvalds struct sock *sk = sock->sk; 3941da177e4SLinus Torvalds 3951da177e4SLinus Torvalds if (sk) { 3961da177e4SLinus Torvalds long timeout; 3971da177e4SLinus Torvalds 3981da177e4SLinus Torvalds /* Applications forget to leave groups before exiting */ 3991da177e4SLinus Torvalds ip_mc_drop_socket(sk); 4001da177e4SLinus Torvalds 4011da177e4SLinus Torvalds /* If linger is set, we don't return until the close 4021da177e4SLinus Torvalds * is complete. Otherwise we return immediately. The 4031da177e4SLinus Torvalds * actually closing is done the same either way. 4041da177e4SLinus Torvalds * 4051da177e4SLinus Torvalds * If the close is due to the process exiting, we never 4061da177e4SLinus Torvalds * linger.. 4071da177e4SLinus Torvalds */ 4081da177e4SLinus Torvalds timeout = 0; 4091da177e4SLinus Torvalds if (sock_flag(sk, SOCK_LINGER) && 4101da177e4SLinus Torvalds !(current->flags & PF_EXITING)) 4111da177e4SLinus Torvalds timeout = sk->sk_lingertime; 4121da177e4SLinus Torvalds sock->sk = NULL; 4131da177e4SLinus Torvalds sk->sk_prot->close(sk, timeout); 4141da177e4SLinus Torvalds } 4151da177e4SLinus Torvalds return 0; 4161da177e4SLinus Torvalds } 4173d1427f8SEric Dumazet EXPORT_SYMBOL(inet_release); 4181da177e4SLinus Torvalds 4191da177e4SLinus Torvalds int inet_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len) 4201da177e4SLinus Torvalds { 4211da177e4SLinus Torvalds struct sockaddr_in *addr = (struct sockaddr_in *)uaddr; 4221da177e4SLinus Torvalds struct sock *sk = sock->sk; 4231da177e4SLinus Torvalds struct inet_sock *inet = inet_sk(sk); 4243594698aSEric W. Biederman struct net *net = sock_net(sk); 4251da177e4SLinus Torvalds unsigned short snum; 4261da177e4SLinus Torvalds int chk_addr_ret; 4271da177e4SLinus Torvalds int err; 4281da177e4SLinus Torvalds 4291da177e4SLinus Torvalds /* If the socket has its own bind function then use it. (RAW) */ 4301da177e4SLinus Torvalds if (sk->sk_prot->bind) { 4311da177e4SLinus Torvalds err = sk->sk_prot->bind(sk, uaddr, addr_len); 4321da177e4SLinus Torvalds goto out; 4331da177e4SLinus Torvalds } 4341da177e4SLinus Torvalds err = -EINVAL; 4351da177e4SLinus Torvalds if (addr_len < sizeof(struct sockaddr_in)) 4361da177e4SLinus Torvalds goto out; 4371da177e4SLinus Torvalds 438c349a528SMarcus Meissner if (addr->sin_family != AF_INET) { 43929c486dfSEric Dumazet /* Compatibility games : accept AF_UNSPEC (mapped to AF_INET) 44029c486dfSEric Dumazet * only if s_addr is INADDR_ANY. 44129c486dfSEric Dumazet */ 442c349a528SMarcus Meissner err = -EAFNOSUPPORT; 44329c486dfSEric Dumazet if (addr->sin_family != AF_UNSPEC || 44429c486dfSEric Dumazet addr->sin_addr.s_addr != htonl(INADDR_ANY)) 445d0733d2eSMarcus Meissner goto out; 446c349a528SMarcus Meissner } 447d0733d2eSMarcus Meissner 4483594698aSEric W. Biederman chk_addr_ret = inet_addr_type(net, addr->sin_addr.s_addr); 4491da177e4SLinus Torvalds 4501da177e4SLinus Torvalds /* Not specified by any standard per-se, however it breaks too 4511da177e4SLinus Torvalds * many applications when removed. It is unfortunate since 4521da177e4SLinus Torvalds * allowing applications to make a non-local bind solves 4531da177e4SLinus Torvalds * several problems with systems using dynamic addressing. 4541da177e4SLinus Torvalds * (ie. your servers still start up even if your ISDN link 4551da177e4SLinus Torvalds * is temporarily down) 4561da177e4SLinus Torvalds */ 4571da177e4SLinus Torvalds err = -EADDRNOTAVAIL; 45849a60158SVincent Bernat if (!net->ipv4.sysctl_ip_nonlocal_bind && 459b9fb1506STóth László Attila !(inet->freebind || inet->transparent) && 460e6f1cebfSAl Viro addr->sin_addr.s_addr != htonl(INADDR_ANY) && 4611da177e4SLinus Torvalds chk_addr_ret != RTN_LOCAL && 4621da177e4SLinus Torvalds chk_addr_ret != RTN_MULTICAST && 4631da177e4SLinus Torvalds chk_addr_ret != RTN_BROADCAST) 4641da177e4SLinus Torvalds goto out; 4651da177e4SLinus Torvalds 4661da177e4SLinus Torvalds snum = ntohs(addr->sin_port); 4671da177e4SLinus Torvalds err = -EACCES; 4683594698aSEric W. Biederman if (snum && snum < PROT_SOCK && 4693594698aSEric W. Biederman !ns_capable(net->user_ns, CAP_NET_BIND_SERVICE)) 4701da177e4SLinus Torvalds goto out; 4711da177e4SLinus Torvalds 4721da177e4SLinus Torvalds /* We keep a pair of addresses. rcv_saddr is the one 4731da177e4SLinus Torvalds * used by hash lookups, and saddr is used for transmit. 4741da177e4SLinus Torvalds * 4751da177e4SLinus Torvalds * In the BSD API these are the same except where it 4761da177e4SLinus Torvalds * would be illegal to use them (multicast/broadcast) in 4771da177e4SLinus Torvalds * which case the sending device address is used. 4781da177e4SLinus Torvalds */ 4791da177e4SLinus Torvalds lock_sock(sk); 4801da177e4SLinus Torvalds 4811da177e4SLinus Torvalds /* Check these errors (active socket, double bind). */ 4821da177e4SLinus Torvalds err = -EINVAL; 483c720c7e8SEric Dumazet if (sk->sk_state != TCP_CLOSE || inet->inet_num) 4841da177e4SLinus Torvalds goto out_release_sock; 4851da177e4SLinus Torvalds 486c720c7e8SEric Dumazet inet->inet_rcv_saddr = inet->inet_saddr = addr->sin_addr.s_addr; 4871da177e4SLinus Torvalds if (chk_addr_ret == RTN_MULTICAST || chk_addr_ret == RTN_BROADCAST) 488c720c7e8SEric Dumazet inet->inet_saddr = 0; /* Use device */ 4891da177e4SLinus Torvalds 4901da177e4SLinus Torvalds /* Make sure we are allowed to bind here. */ 49190c337daSEric Dumazet if ((snum || !inet->bind_address_no_port) && 49290c337daSEric Dumazet sk->sk_prot->get_port(sk, snum)) { 493c720c7e8SEric Dumazet inet->inet_saddr = inet->inet_rcv_saddr = 0; 4941da177e4SLinus Torvalds err = -EADDRINUSE; 4951da177e4SLinus Torvalds goto out_release_sock; 4961da177e4SLinus Torvalds } 4971da177e4SLinus Torvalds 498c720c7e8SEric Dumazet if (inet->inet_rcv_saddr) 4991da177e4SLinus Torvalds sk->sk_userlocks |= SOCK_BINDADDR_LOCK; 5001da177e4SLinus Torvalds if (snum) 5011da177e4SLinus Torvalds sk->sk_userlocks |= SOCK_BINDPORT_LOCK; 502c720c7e8SEric Dumazet inet->inet_sport = htons(inet->inet_num); 503c720c7e8SEric Dumazet inet->inet_daddr = 0; 504c720c7e8SEric Dumazet inet->inet_dport = 0; 5051da177e4SLinus Torvalds sk_dst_reset(sk); 5061da177e4SLinus Torvalds err = 0; 5071da177e4SLinus Torvalds out_release_sock: 5081da177e4SLinus Torvalds release_sock(sk); 5091da177e4SLinus Torvalds out: 5101da177e4SLinus Torvalds return err; 5111da177e4SLinus Torvalds } 5123d1427f8SEric Dumazet EXPORT_SYMBOL(inet_bind); 5131da177e4SLinus Torvalds 5141da177e4SLinus Torvalds int inet_dgram_connect(struct socket *sock, struct sockaddr *uaddr, 5151da177e4SLinus Torvalds int addr_len, int flags) 5161da177e4SLinus Torvalds { 5171da177e4SLinus Torvalds struct sock *sk = sock->sk; 5181da177e4SLinus Torvalds 5196503d961SChangli Gao if (addr_len < sizeof(uaddr->sa_family)) 5206503d961SChangli Gao return -EINVAL; 5211da177e4SLinus Torvalds if (uaddr->sa_family == AF_UNSPEC) 5221da177e4SLinus Torvalds return sk->sk_prot->disconnect(sk, flags); 5231da177e4SLinus Torvalds 524c720c7e8SEric Dumazet if (!inet_sk(sk)->inet_num && inet_autobind(sk)) 5251da177e4SLinus Torvalds return -EAGAIN; 526e3192690SJoe Perches return sk->sk_prot->connect(sk, uaddr, addr_len); 5271da177e4SLinus Torvalds } 5283d1427f8SEric Dumazet EXPORT_SYMBOL(inet_dgram_connect); 5291da177e4SLinus Torvalds 530783237e8SYuchung Cheng static long inet_wait_for_connect(struct sock *sk, long timeo, int writebias) 5311da177e4SLinus Torvalds { 5321da177e4SLinus Torvalds DEFINE_WAIT(wait); 5331da177e4SLinus Torvalds 534aa395145SEric Dumazet prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); 535783237e8SYuchung Cheng sk->sk_write_pending += writebias; 5361da177e4SLinus Torvalds 5371da177e4SLinus Torvalds /* Basic assumption: if someone sets sk->sk_err, he _must_ 5381da177e4SLinus Torvalds * change state of the socket from TCP_SYN_*. 5391da177e4SLinus Torvalds * Connect() does not allow to get error notifications 5401da177e4SLinus Torvalds * without closing the socket. 5411da177e4SLinus Torvalds */ 5421da177e4SLinus Torvalds while ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV)) { 5431da177e4SLinus Torvalds release_sock(sk); 5441da177e4SLinus Torvalds timeo = schedule_timeout(timeo); 5451da177e4SLinus Torvalds lock_sock(sk); 5461da177e4SLinus Torvalds if (signal_pending(current) || !timeo) 5471da177e4SLinus Torvalds break; 548aa395145SEric Dumazet prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); 5491da177e4SLinus Torvalds } 550aa395145SEric Dumazet finish_wait(sk_sleep(sk), &wait); 551783237e8SYuchung Cheng sk->sk_write_pending -= writebias; 5521da177e4SLinus Torvalds return timeo; 5531da177e4SLinus Torvalds } 5541da177e4SLinus Torvalds 5551da177e4SLinus Torvalds /* 5561da177e4SLinus Torvalds * Connect to a remote host. There is regrettably still a little 5571da177e4SLinus Torvalds * TCP 'magic' in here. 5581da177e4SLinus Torvalds */ 559cf60af03SYuchung Cheng int __inet_stream_connect(struct socket *sock, struct sockaddr *uaddr, 5601da177e4SLinus Torvalds int addr_len, int flags) 5611da177e4SLinus Torvalds { 5621da177e4SLinus Torvalds struct sock *sk = sock->sk; 5631da177e4SLinus Torvalds int err; 5641da177e4SLinus Torvalds long timeo; 5651da177e4SLinus Torvalds 5666503d961SChangli Gao if (addr_len < sizeof(uaddr->sa_family)) 5676503d961SChangli Gao return -EINVAL; 5686503d961SChangli Gao 5691da177e4SLinus Torvalds if (uaddr->sa_family == AF_UNSPEC) { 5701da177e4SLinus Torvalds err = sk->sk_prot->disconnect(sk, flags); 5711da177e4SLinus Torvalds sock->state = err ? SS_DISCONNECTING : SS_UNCONNECTED; 5721da177e4SLinus Torvalds goto out; 5731da177e4SLinus Torvalds } 5741da177e4SLinus Torvalds 5751da177e4SLinus Torvalds switch (sock->state) { 5761da177e4SLinus Torvalds default: 5771da177e4SLinus Torvalds err = -EINVAL; 5781da177e4SLinus Torvalds goto out; 5791da177e4SLinus Torvalds case SS_CONNECTED: 5801da177e4SLinus Torvalds err = -EISCONN; 5811da177e4SLinus Torvalds goto out; 5821da177e4SLinus Torvalds case SS_CONNECTING: 5831da177e4SLinus Torvalds err = -EALREADY; 5841da177e4SLinus Torvalds /* Fall out of switch with err, set for this state */ 5851da177e4SLinus Torvalds break; 5861da177e4SLinus Torvalds case SS_UNCONNECTED: 5871da177e4SLinus Torvalds err = -EISCONN; 5881da177e4SLinus Torvalds if (sk->sk_state != TCP_CLOSE) 5891da177e4SLinus Torvalds goto out; 5901da177e4SLinus Torvalds 5911da177e4SLinus Torvalds err = sk->sk_prot->connect(sk, uaddr, addr_len); 5921da177e4SLinus Torvalds if (err < 0) 5931da177e4SLinus Torvalds goto out; 5941da177e4SLinus Torvalds 5951da177e4SLinus Torvalds sock->state = SS_CONNECTING; 5961da177e4SLinus Torvalds 5971da177e4SLinus Torvalds /* Just entered SS_CONNECTING state; the only 5981da177e4SLinus Torvalds * difference is that return value in non-blocking 5991da177e4SLinus Torvalds * case is EINPROGRESS, rather than EALREADY. 6001da177e4SLinus Torvalds */ 6011da177e4SLinus Torvalds err = -EINPROGRESS; 6021da177e4SLinus Torvalds break; 6031da177e4SLinus Torvalds } 6041da177e4SLinus Torvalds 6051da177e4SLinus Torvalds timeo = sock_sndtimeo(sk, flags & O_NONBLOCK); 6061da177e4SLinus Torvalds 6071da177e4SLinus Torvalds if ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV)) { 608783237e8SYuchung Cheng int writebias = (sk->sk_protocol == IPPROTO_TCP) && 609783237e8SYuchung Cheng tcp_sk(sk)->fastopen_req && 610783237e8SYuchung Cheng tcp_sk(sk)->fastopen_req->data ? 1 : 0; 611783237e8SYuchung Cheng 6121da177e4SLinus Torvalds /* Error code is set above */ 613783237e8SYuchung Cheng if (!timeo || !inet_wait_for_connect(sk, timeo, writebias)) 6141da177e4SLinus Torvalds goto out; 6151da177e4SLinus Torvalds 6161da177e4SLinus Torvalds err = sock_intr_errno(timeo); 6171da177e4SLinus Torvalds if (signal_pending(current)) 6181da177e4SLinus Torvalds goto out; 6191da177e4SLinus Torvalds } 6201da177e4SLinus Torvalds 6211da177e4SLinus Torvalds /* Connection was closed by RST, timeout, ICMP error 6221da177e4SLinus Torvalds * or another process disconnected us. 6231da177e4SLinus Torvalds */ 6241da177e4SLinus Torvalds if (sk->sk_state == TCP_CLOSE) 6251da177e4SLinus Torvalds goto sock_error; 6261da177e4SLinus Torvalds 6271da177e4SLinus Torvalds /* sk->sk_err may be not zero now, if RECVERR was ordered by user 6281da177e4SLinus Torvalds * and error was received after socket entered established state. 6291da177e4SLinus Torvalds * Hence, it is handled normally after connect() return successfully. 6301da177e4SLinus Torvalds */ 6311da177e4SLinus Torvalds 6321da177e4SLinus Torvalds sock->state = SS_CONNECTED; 6331da177e4SLinus Torvalds err = 0; 6341da177e4SLinus Torvalds out: 6351da177e4SLinus Torvalds return err; 6361da177e4SLinus Torvalds 6371da177e4SLinus Torvalds sock_error: 6381da177e4SLinus Torvalds err = sock_error(sk) ? : -ECONNABORTED; 6391da177e4SLinus Torvalds sock->state = SS_UNCONNECTED; 6401da177e4SLinus Torvalds if (sk->sk_prot->disconnect(sk, flags)) 6411da177e4SLinus Torvalds sock->state = SS_DISCONNECTING; 6421da177e4SLinus Torvalds goto out; 6431da177e4SLinus Torvalds } 644cf60af03SYuchung Cheng EXPORT_SYMBOL(__inet_stream_connect); 645cf60af03SYuchung Cheng 646cf60af03SYuchung Cheng int inet_stream_connect(struct socket *sock, struct sockaddr *uaddr, 647cf60af03SYuchung Cheng int addr_len, int flags) 648cf60af03SYuchung Cheng { 649cf60af03SYuchung Cheng int err; 650cf60af03SYuchung Cheng 651cf60af03SYuchung Cheng lock_sock(sock->sk); 652cf60af03SYuchung Cheng err = __inet_stream_connect(sock, uaddr, addr_len, flags); 653cf60af03SYuchung Cheng release_sock(sock->sk); 654cf60af03SYuchung Cheng return err; 655cf60af03SYuchung Cheng } 6563d1427f8SEric Dumazet EXPORT_SYMBOL(inet_stream_connect); 6571da177e4SLinus Torvalds 6581da177e4SLinus Torvalds /* 6591da177e4SLinus Torvalds * Accept a pending connection. The TCP layer now gives BSD semantics. 6601da177e4SLinus Torvalds */ 6611da177e4SLinus Torvalds 6621da177e4SLinus Torvalds int inet_accept(struct socket *sock, struct socket *newsock, int flags) 6631da177e4SLinus Torvalds { 6641da177e4SLinus Torvalds struct sock *sk1 = sock->sk; 6651da177e4SLinus Torvalds int err = -EINVAL; 6661da177e4SLinus Torvalds struct sock *sk2 = sk1->sk_prot->accept(sk1, flags, &err); 6671da177e4SLinus Torvalds 6681da177e4SLinus Torvalds if (!sk2) 6691da177e4SLinus Torvalds goto do_err; 6701da177e4SLinus Torvalds 6711da177e4SLinus Torvalds lock_sock(sk2); 6721da177e4SLinus Torvalds 6731eddceadSEric Dumazet sock_rps_record_flow(sk2); 674547b792cSIlpo Järvinen WARN_ON(!((1 << sk2->sk_state) & 6758336886fSJerry Chu (TCPF_ESTABLISHED | TCPF_SYN_RECV | 6768336886fSJerry Chu TCPF_CLOSE_WAIT | TCPF_CLOSE))); 6771da177e4SLinus Torvalds 6781da177e4SLinus Torvalds sock_graft(sk2, newsock); 6791da177e4SLinus Torvalds 6801da177e4SLinus Torvalds newsock->state = SS_CONNECTED; 6811da177e4SLinus Torvalds err = 0; 6821da177e4SLinus Torvalds release_sock(sk2); 6831da177e4SLinus Torvalds do_err: 6841da177e4SLinus Torvalds return err; 6851da177e4SLinus Torvalds } 6863d1427f8SEric Dumazet EXPORT_SYMBOL(inet_accept); 6871da177e4SLinus Torvalds 6881da177e4SLinus Torvalds 6891da177e4SLinus Torvalds /* 6901da177e4SLinus Torvalds * This does both peername and sockname. 6911da177e4SLinus Torvalds */ 6921da177e4SLinus Torvalds int inet_getname(struct socket *sock, struct sockaddr *uaddr, 6931da177e4SLinus Torvalds int *uaddr_len, int peer) 6941da177e4SLinus Torvalds { 6951da177e4SLinus Torvalds struct sock *sk = sock->sk; 6961da177e4SLinus Torvalds struct inet_sock *inet = inet_sk(sk); 69738bfd8f5SCyrill Gorcunov DECLARE_SOCKADDR(struct sockaddr_in *, sin, uaddr); 6981da177e4SLinus Torvalds 6991da177e4SLinus Torvalds sin->sin_family = AF_INET; 7001da177e4SLinus Torvalds if (peer) { 701c720c7e8SEric Dumazet if (!inet->inet_dport || 7021da177e4SLinus Torvalds (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) && 7031da177e4SLinus Torvalds peer == 1)) 7041da177e4SLinus Torvalds return -ENOTCONN; 705c720c7e8SEric Dumazet sin->sin_port = inet->inet_dport; 706c720c7e8SEric Dumazet sin->sin_addr.s_addr = inet->inet_daddr; 7071da177e4SLinus Torvalds } else { 708c720c7e8SEric Dumazet __be32 addr = inet->inet_rcv_saddr; 7091da177e4SLinus Torvalds if (!addr) 710c720c7e8SEric Dumazet addr = inet->inet_saddr; 711c720c7e8SEric Dumazet sin->sin_port = inet->inet_sport; 7121da177e4SLinus Torvalds sin->sin_addr.s_addr = addr; 7131da177e4SLinus Torvalds } 7141da177e4SLinus Torvalds memset(sin->sin_zero, 0, sizeof(sin->sin_zero)); 7151da177e4SLinus Torvalds *uaddr_len = sizeof(*sin); 7161da177e4SLinus Torvalds return 0; 7171da177e4SLinus Torvalds } 7183d1427f8SEric Dumazet EXPORT_SYMBOL(inet_getname); 7191da177e4SLinus Torvalds 7201b784140SYing Xue int inet_sendmsg(struct socket *sock, struct msghdr *msg, size_t size) 7211da177e4SLinus Torvalds { 7221da177e4SLinus Torvalds struct sock *sk = sock->sk; 7231da177e4SLinus Torvalds 724c58dc01bSDavid S. Miller sock_rps_record_flow(sk); 725fec5e652STom Herbert 7261da177e4SLinus Torvalds /* We may need to bind the socket. */ 7277ba42910SChangli Gao if (!inet_sk(sk)->inet_num && !sk->sk_prot->no_autobind && 7287ba42910SChangli Gao inet_autobind(sk)) 7291da177e4SLinus Torvalds return -EAGAIN; 7301da177e4SLinus Torvalds 7311b784140SYing Xue return sk->sk_prot->sendmsg(sk, msg, size); 7321da177e4SLinus Torvalds } 7333d1427f8SEric Dumazet EXPORT_SYMBOL(inet_sendmsg); 7341da177e4SLinus Torvalds 7357ba42910SChangli Gao ssize_t inet_sendpage(struct socket *sock, struct page *page, int offset, 7363d1427f8SEric Dumazet size_t size, int flags) 7371da177e4SLinus Torvalds { 7381da177e4SLinus Torvalds struct sock *sk = sock->sk; 7391da177e4SLinus Torvalds 740c58dc01bSDavid S. Miller sock_rps_record_flow(sk); 741fec5e652STom Herbert 7421da177e4SLinus Torvalds /* We may need to bind the socket. */ 7437ba42910SChangli Gao if (!inet_sk(sk)->inet_num && !sk->sk_prot->no_autobind && 7447ba42910SChangli Gao inet_autobind(sk)) 7451da177e4SLinus Torvalds return -EAGAIN; 7461da177e4SLinus Torvalds 7471da177e4SLinus Torvalds if (sk->sk_prot->sendpage) 7481da177e4SLinus Torvalds return sk->sk_prot->sendpage(sk, page, offset, size, flags); 7491da177e4SLinus Torvalds return sock_no_sendpage(sock, page, offset, size, flags); 7501da177e4SLinus Torvalds } 7517ba42910SChangli Gao EXPORT_SYMBOL(inet_sendpage); 7521da177e4SLinus Torvalds 7531b784140SYing Xue int inet_recvmsg(struct socket *sock, struct msghdr *msg, size_t size, 7541b784140SYing Xue int flags) 755fec5e652STom Herbert { 756fec5e652STom Herbert struct sock *sk = sock->sk; 757fec5e652STom Herbert int addr_len = 0; 758fec5e652STom Herbert int err; 759fec5e652STom Herbert 760c58dc01bSDavid S. Miller sock_rps_record_flow(sk); 761fec5e652STom Herbert 7621b784140SYing Xue err = sk->sk_prot->recvmsg(sk, msg, size, flags & MSG_DONTWAIT, 763fec5e652STom Herbert flags & ~MSG_DONTWAIT, &addr_len); 764fec5e652STom Herbert if (err >= 0) 765fec5e652STom Herbert msg->msg_namelen = addr_len; 766fec5e652STom Herbert return err; 767fec5e652STom Herbert } 768fec5e652STom Herbert EXPORT_SYMBOL(inet_recvmsg); 7691da177e4SLinus Torvalds 7701da177e4SLinus Torvalds int inet_shutdown(struct socket *sock, int how) 7711da177e4SLinus Torvalds { 7721da177e4SLinus Torvalds struct sock *sk = sock->sk; 7731da177e4SLinus Torvalds int err = 0; 7741da177e4SLinus Torvalds 7751da177e4SLinus Torvalds /* This should really check to make sure 7761da177e4SLinus Torvalds * the socket is a TCP socket. (WHY AC...) 7771da177e4SLinus Torvalds */ 7781da177e4SLinus Torvalds how++; /* maps 0->1 has the advantage of making bit 1 rcvs and 7791da177e4SLinus Torvalds 1->2 bit 2 snds. 7801da177e4SLinus Torvalds 2->3 */ 7811da177e4SLinus Torvalds if ((how & ~SHUTDOWN_MASK) || !how) /* MAXINT->0 */ 7821da177e4SLinus Torvalds return -EINVAL; 7831da177e4SLinus Torvalds 7841da177e4SLinus Torvalds lock_sock(sk); 7851da177e4SLinus Torvalds if (sock->state == SS_CONNECTING) { 7861da177e4SLinus Torvalds if ((1 << sk->sk_state) & 7871da177e4SLinus Torvalds (TCPF_SYN_SENT | TCPF_SYN_RECV | TCPF_CLOSE)) 7881da177e4SLinus Torvalds sock->state = SS_DISCONNECTING; 7891da177e4SLinus Torvalds else 7901da177e4SLinus Torvalds sock->state = SS_CONNECTED; 7911da177e4SLinus Torvalds } 7921da177e4SLinus Torvalds 7931da177e4SLinus Torvalds switch (sk->sk_state) { 7941da177e4SLinus Torvalds case TCP_CLOSE: 7951da177e4SLinus Torvalds err = -ENOTCONN; 7961da177e4SLinus Torvalds /* Hack to wake up other listeners, who can poll for 7971da177e4SLinus Torvalds POLLHUP, even on eg. unconnected UDP sockets -- RR */ 7981da177e4SLinus Torvalds default: 7991da177e4SLinus Torvalds sk->sk_shutdown |= how; 8001da177e4SLinus Torvalds if (sk->sk_prot->shutdown) 8011da177e4SLinus Torvalds sk->sk_prot->shutdown(sk, how); 8021da177e4SLinus Torvalds break; 8031da177e4SLinus Torvalds 8041da177e4SLinus Torvalds /* Remaining two branches are temporary solution for missing 8051da177e4SLinus Torvalds * close() in multithreaded environment. It is _not_ a good idea, 8061da177e4SLinus Torvalds * but we have no choice until close() is repaired at VFS level. 8071da177e4SLinus Torvalds */ 8081da177e4SLinus Torvalds case TCP_LISTEN: 8091da177e4SLinus Torvalds if (!(how & RCV_SHUTDOWN)) 8101da177e4SLinus Torvalds break; 8111da177e4SLinus Torvalds /* Fall through */ 8121da177e4SLinus Torvalds case TCP_SYN_SENT: 8131da177e4SLinus Torvalds err = sk->sk_prot->disconnect(sk, O_NONBLOCK); 8141da177e4SLinus Torvalds sock->state = err ? SS_DISCONNECTING : SS_UNCONNECTED; 8151da177e4SLinus Torvalds break; 8161da177e4SLinus Torvalds } 8171da177e4SLinus Torvalds 8181da177e4SLinus Torvalds /* Wake up anyone sleeping in poll. */ 8191da177e4SLinus Torvalds sk->sk_state_change(sk); 8201da177e4SLinus Torvalds release_sock(sk); 8211da177e4SLinus Torvalds return err; 8221da177e4SLinus Torvalds } 8233d1427f8SEric Dumazet EXPORT_SYMBOL(inet_shutdown); 8241da177e4SLinus Torvalds 8251da177e4SLinus Torvalds /* 8261da177e4SLinus Torvalds * ioctl() calls you can issue on an INET socket. Most of these are 8271da177e4SLinus Torvalds * device configuration and stuff and very rarely used. Some ioctls 8281da177e4SLinus Torvalds * pass on to the socket itself. 8291da177e4SLinus Torvalds * 8301da177e4SLinus Torvalds * NOTE: I like the idea of a module for the config stuff. ie ifconfig 8311da177e4SLinus Torvalds * loads the devconfigure module does its configuring and unloads it. 8321da177e4SLinus Torvalds * There's a good 20K of config code hanging around the kernel. 8331da177e4SLinus Torvalds */ 8341da177e4SLinus Torvalds 8351da177e4SLinus Torvalds int inet_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 8361da177e4SLinus Torvalds { 8371da177e4SLinus Torvalds struct sock *sk = sock->sk; 8381da177e4SLinus Torvalds int err = 0; 8393b1e0a65SYOSHIFUJI Hideaki struct net *net = sock_net(sk); 8401da177e4SLinus Torvalds 8411da177e4SLinus Torvalds switch (cmd) { 8421da177e4SLinus Torvalds case SIOCGSTAMP: 8431da177e4SLinus Torvalds err = sock_get_timestamp(sk, (struct timeval __user *)arg); 8441da177e4SLinus Torvalds break; 845ae40eb1eSEric Dumazet case SIOCGSTAMPNS: 846ae40eb1eSEric Dumazet err = sock_get_timestampns(sk, (struct timespec __user *)arg); 847ae40eb1eSEric Dumazet break; 8481da177e4SLinus Torvalds case SIOCADDRT: 8491da177e4SLinus Torvalds case SIOCDELRT: 8501da177e4SLinus Torvalds case SIOCRTMSG: 851e5b13cb1SDenis V. Lunev err = ip_rt_ioctl(net, cmd, (void __user *)arg); 8521da177e4SLinus Torvalds break; 8531da177e4SLinus Torvalds case SIOCDARP: 8541da177e4SLinus Torvalds case SIOCGARP: 8551da177e4SLinus Torvalds case SIOCSARP: 856e5b13cb1SDenis V. Lunev err = arp_ioctl(net, cmd, (void __user *)arg); 8571da177e4SLinus Torvalds break; 8581da177e4SLinus Torvalds case SIOCGIFADDR: 8591da177e4SLinus Torvalds case SIOCSIFADDR: 8601da177e4SLinus Torvalds case SIOCGIFBRDADDR: 8611da177e4SLinus Torvalds case SIOCSIFBRDADDR: 8621da177e4SLinus Torvalds case SIOCGIFNETMASK: 8631da177e4SLinus Torvalds case SIOCSIFNETMASK: 8641da177e4SLinus Torvalds case SIOCGIFDSTADDR: 8651da177e4SLinus Torvalds case SIOCSIFDSTADDR: 8661da177e4SLinus Torvalds case SIOCSIFPFLAGS: 8671da177e4SLinus Torvalds case SIOCGIFPFLAGS: 8681da177e4SLinus Torvalds case SIOCSIFFLAGS: 869e5b13cb1SDenis V. Lunev err = devinet_ioctl(net, cmd, (void __user *)arg); 8701da177e4SLinus Torvalds break; 8711da177e4SLinus Torvalds default: 872b5e5fa5eSChristoph Hellwig if (sk->sk_prot->ioctl) 873b5e5fa5eSChristoph Hellwig err = sk->sk_prot->ioctl(sk, cmd, arg); 874b5e5fa5eSChristoph Hellwig else 875b5e5fa5eSChristoph Hellwig err = -ENOIOCTLCMD; 8761da177e4SLinus Torvalds break; 8771da177e4SLinus Torvalds } 8781da177e4SLinus Torvalds return err; 8791da177e4SLinus Torvalds } 8803d1427f8SEric Dumazet EXPORT_SYMBOL(inet_ioctl); 8811da177e4SLinus Torvalds 882709b46e8SEric W. Biederman #ifdef CONFIG_COMPAT 883686dc6b6SGerrit Renker static int inet_compat_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 884709b46e8SEric W. Biederman { 885709b46e8SEric W. Biederman struct sock *sk = sock->sk; 886709b46e8SEric W. Biederman int err = -ENOIOCTLCMD; 887709b46e8SEric W. Biederman 888709b46e8SEric W. Biederman if (sk->sk_prot->compat_ioctl) 889709b46e8SEric W. Biederman err = sk->sk_prot->compat_ioctl(sk, cmd, arg); 890709b46e8SEric W. Biederman 891709b46e8SEric W. Biederman return err; 892709b46e8SEric W. Biederman } 893709b46e8SEric W. Biederman #endif 894709b46e8SEric W. Biederman 89590ddc4f0SEric Dumazet const struct proto_ops inet_stream_ops = { 8961da177e4SLinus Torvalds .family = PF_INET, 8971da177e4SLinus Torvalds .owner = THIS_MODULE, 8981da177e4SLinus Torvalds .release = inet_release, 8991da177e4SLinus Torvalds .bind = inet_bind, 9001da177e4SLinus Torvalds .connect = inet_stream_connect, 9011da177e4SLinus Torvalds .socketpair = sock_no_socketpair, 9021da177e4SLinus Torvalds .accept = inet_accept, 9031da177e4SLinus Torvalds .getname = inet_getname, 9041da177e4SLinus Torvalds .poll = tcp_poll, 9051da177e4SLinus Torvalds .ioctl = inet_ioctl, 9061da177e4SLinus Torvalds .listen = inet_listen, 9071da177e4SLinus Torvalds .shutdown = inet_shutdown, 9081da177e4SLinus Torvalds .setsockopt = sock_common_setsockopt, 9091da177e4SLinus Torvalds .getsockopt = sock_common_getsockopt, 9107ba42910SChangli Gao .sendmsg = inet_sendmsg, 911fec5e652STom Herbert .recvmsg = inet_recvmsg, 912543d9cfeSArnaldo Carvalho de Melo .mmap = sock_no_mmap, 9137ba42910SChangli Gao .sendpage = inet_sendpage, 9149c55e01cSJens Axboe .splice_read = tcp_splice_read, 9153fdadf7dSDmitry Mishin #ifdef CONFIG_COMPAT 9163fdadf7dSDmitry Mishin .compat_setsockopt = compat_sock_common_setsockopt, 9173fdadf7dSDmitry Mishin .compat_getsockopt = compat_sock_common_getsockopt, 918709b46e8SEric W. Biederman .compat_ioctl = inet_compat_ioctl, 9193fdadf7dSDmitry Mishin #endif 9201da177e4SLinus Torvalds }; 9213d1427f8SEric Dumazet EXPORT_SYMBOL(inet_stream_ops); 9221da177e4SLinus Torvalds 92390ddc4f0SEric Dumazet const struct proto_ops inet_dgram_ops = { 9241da177e4SLinus Torvalds .family = PF_INET, 9251da177e4SLinus Torvalds .owner = THIS_MODULE, 9261da177e4SLinus Torvalds .release = inet_release, 9271da177e4SLinus Torvalds .bind = inet_bind, 9281da177e4SLinus Torvalds .connect = inet_dgram_connect, 9291da177e4SLinus Torvalds .socketpair = sock_no_socketpair, 9301da177e4SLinus Torvalds .accept = sock_no_accept, 9311da177e4SLinus Torvalds .getname = inet_getname, 9321da177e4SLinus Torvalds .poll = udp_poll, 9331da177e4SLinus Torvalds .ioctl = inet_ioctl, 9341da177e4SLinus Torvalds .listen = sock_no_listen, 9351da177e4SLinus Torvalds .shutdown = inet_shutdown, 9361da177e4SLinus Torvalds .setsockopt = sock_common_setsockopt, 9371da177e4SLinus Torvalds .getsockopt = sock_common_getsockopt, 9381da177e4SLinus Torvalds .sendmsg = inet_sendmsg, 939fec5e652STom Herbert .recvmsg = inet_recvmsg, 9401da177e4SLinus Torvalds .mmap = sock_no_mmap, 9411da177e4SLinus Torvalds .sendpage = inet_sendpage, 942543d9cfeSArnaldo Carvalho de Melo #ifdef CONFIG_COMPAT 943543d9cfeSArnaldo Carvalho de Melo .compat_setsockopt = compat_sock_common_setsockopt, 944543d9cfeSArnaldo Carvalho de Melo .compat_getsockopt = compat_sock_common_getsockopt, 945709b46e8SEric W. Biederman .compat_ioctl = inet_compat_ioctl, 946543d9cfeSArnaldo Carvalho de Melo #endif 9471da177e4SLinus Torvalds }; 9483d1427f8SEric Dumazet EXPORT_SYMBOL(inet_dgram_ops); 9491da177e4SLinus Torvalds 9501da177e4SLinus Torvalds /* 9511da177e4SLinus Torvalds * For SOCK_RAW sockets; should be the same as inet_dgram_ops but without 9521da177e4SLinus Torvalds * udp_poll 9531da177e4SLinus Torvalds */ 95490ddc4f0SEric Dumazet static const struct proto_ops inet_sockraw_ops = { 9551da177e4SLinus Torvalds .family = PF_INET, 9561da177e4SLinus Torvalds .owner = THIS_MODULE, 9571da177e4SLinus Torvalds .release = inet_release, 9581da177e4SLinus Torvalds .bind = inet_bind, 9591da177e4SLinus Torvalds .connect = inet_dgram_connect, 9601da177e4SLinus Torvalds .socketpair = sock_no_socketpair, 9611da177e4SLinus Torvalds .accept = sock_no_accept, 9621da177e4SLinus Torvalds .getname = inet_getname, 9631da177e4SLinus Torvalds .poll = datagram_poll, 9641da177e4SLinus Torvalds .ioctl = inet_ioctl, 9651da177e4SLinus Torvalds .listen = sock_no_listen, 9661da177e4SLinus Torvalds .shutdown = inet_shutdown, 9671da177e4SLinus Torvalds .setsockopt = sock_common_setsockopt, 9681da177e4SLinus Torvalds .getsockopt = sock_common_getsockopt, 9691da177e4SLinus Torvalds .sendmsg = inet_sendmsg, 970fec5e652STom Herbert .recvmsg = inet_recvmsg, 9711da177e4SLinus Torvalds .mmap = sock_no_mmap, 9721da177e4SLinus Torvalds .sendpage = inet_sendpage, 973543d9cfeSArnaldo Carvalho de Melo #ifdef CONFIG_COMPAT 974543d9cfeSArnaldo Carvalho de Melo .compat_setsockopt = compat_sock_common_setsockopt, 975543d9cfeSArnaldo Carvalho de Melo .compat_getsockopt = compat_sock_common_getsockopt, 976709b46e8SEric W. Biederman .compat_ioctl = inet_compat_ioctl, 977543d9cfeSArnaldo Carvalho de Melo #endif 9781da177e4SLinus Torvalds }; 9791da177e4SLinus Torvalds 980ec1b4cf7SStephen Hemminger static const struct net_proto_family inet_family_ops = { 9811da177e4SLinus Torvalds .family = PF_INET, 9821da177e4SLinus Torvalds .create = inet_create, 9831da177e4SLinus Torvalds .owner = THIS_MODULE, 9841da177e4SLinus Torvalds }; 9851da177e4SLinus Torvalds 9861da177e4SLinus Torvalds /* Upon startup we insert all the elements in inetsw_array[] into 9871da177e4SLinus Torvalds * the linked list inetsw. 9881da177e4SLinus Torvalds */ 9891da177e4SLinus Torvalds static struct inet_protosw inetsw_array[] = 9901da177e4SLinus Torvalds { 9911da177e4SLinus Torvalds { 9921da177e4SLinus Torvalds .type = SOCK_STREAM, 9931da177e4SLinus Torvalds .protocol = IPPROTO_TCP, 9941da177e4SLinus Torvalds .prot = &tcp_prot, 9951da177e4SLinus Torvalds .ops = &inet_stream_ops, 996d83d8461SArnaldo Carvalho de Melo .flags = INET_PROTOSW_PERMANENT | 997d83d8461SArnaldo Carvalho de Melo INET_PROTOSW_ICSK, 9981da177e4SLinus Torvalds }, 9991da177e4SLinus Torvalds 10001da177e4SLinus Torvalds { 10011da177e4SLinus Torvalds .type = SOCK_DGRAM, 10021da177e4SLinus Torvalds .protocol = IPPROTO_UDP, 10031da177e4SLinus Torvalds .prot = &udp_prot, 10041da177e4SLinus Torvalds .ops = &inet_dgram_ops, 10051da177e4SLinus Torvalds .flags = INET_PROTOSW_PERMANENT, 10061da177e4SLinus Torvalds }, 10071da177e4SLinus Torvalds 1008c319b4d7SVasiliy Kulikov { 1009c319b4d7SVasiliy Kulikov .type = SOCK_DGRAM, 1010c319b4d7SVasiliy Kulikov .protocol = IPPROTO_ICMP, 1011c319b4d7SVasiliy Kulikov .prot = &ping_prot, 1012c319b4d7SVasiliy Kulikov .ops = &inet_dgram_ops, 1013c319b4d7SVasiliy Kulikov .flags = INET_PROTOSW_REUSE, 1014c319b4d7SVasiliy Kulikov }, 10151da177e4SLinus Torvalds 10161da177e4SLinus Torvalds { 10171da177e4SLinus Torvalds .type = SOCK_RAW, 10181da177e4SLinus Torvalds .protocol = IPPROTO_IP, /* wild card */ 10191da177e4SLinus Torvalds .prot = &raw_prot, 10201da177e4SLinus Torvalds .ops = &inet_sockraw_ops, 10211da177e4SLinus Torvalds .flags = INET_PROTOSW_REUSE, 10221da177e4SLinus Torvalds } 10231da177e4SLinus Torvalds }; 10241da177e4SLinus Torvalds 1025c40f6fffSDenis Cheng #define INETSW_ARRAY_LEN ARRAY_SIZE(inetsw_array) 10261da177e4SLinus Torvalds 10271da177e4SLinus Torvalds void inet_register_protosw(struct inet_protosw *p) 10281da177e4SLinus Torvalds { 10291da177e4SLinus Torvalds struct list_head *lh; 10301da177e4SLinus Torvalds struct inet_protosw *answer; 10311da177e4SLinus Torvalds int protocol = p->protocol; 10321da177e4SLinus Torvalds struct list_head *last_perm; 10331da177e4SLinus Torvalds 10341da177e4SLinus Torvalds spin_lock_bh(&inetsw_lock); 10351da177e4SLinus Torvalds 10361da177e4SLinus Torvalds if (p->type >= SOCK_MAX) 10371da177e4SLinus Torvalds goto out_illegal; 10381da177e4SLinus Torvalds 10391da177e4SLinus Torvalds /* If we are trying to override a permanent protocol, bail. */ 10401da177e4SLinus Torvalds answer = NULL; 10411da177e4SLinus Torvalds last_perm = &inetsw[p->type]; 10421da177e4SLinus Torvalds list_for_each(lh, &inetsw[p->type]) { 10431da177e4SLinus Torvalds answer = list_entry(lh, struct inet_protosw, list); 10441da177e4SLinus Torvalds 10451da177e4SLinus Torvalds /* Check only the non-wild match. */ 10461da177e4SLinus Torvalds if (INET_PROTOSW_PERMANENT & answer->flags) { 10471da177e4SLinus Torvalds if (protocol == answer->protocol) 10481da177e4SLinus Torvalds break; 10491da177e4SLinus Torvalds last_perm = lh; 10501da177e4SLinus Torvalds } 10511da177e4SLinus Torvalds 10521da177e4SLinus Torvalds answer = NULL; 10531da177e4SLinus Torvalds } 10541da177e4SLinus Torvalds if (answer) 10551da177e4SLinus Torvalds goto out_permanent; 10561da177e4SLinus Torvalds 10571da177e4SLinus Torvalds /* Add the new entry after the last permanent entry if any, so that 10581da177e4SLinus Torvalds * the new entry does not override a permanent entry when matched with 10591da177e4SLinus Torvalds * a wild-card protocol. But it is allowed to override any existing 10601da177e4SLinus Torvalds * non-permanent entry. This means that when we remove this entry, the 10611da177e4SLinus Torvalds * system automatically returns to the old behavior. 10621da177e4SLinus Torvalds */ 10631da177e4SLinus Torvalds list_add_rcu(&p->list, last_perm); 10641da177e4SLinus Torvalds out: 10651da177e4SLinus Torvalds spin_unlock_bh(&inetsw_lock); 10661da177e4SLinus Torvalds 10671da177e4SLinus Torvalds return; 10681da177e4SLinus Torvalds 10691da177e4SLinus Torvalds out_permanent: 1070058bd4d2SJoe Perches pr_err("Attempt to override permanent protocol %d\n", protocol); 10711da177e4SLinus Torvalds goto out; 10721da177e4SLinus Torvalds 10731da177e4SLinus Torvalds out_illegal: 1074058bd4d2SJoe Perches pr_err("Ignoring attempt to register invalid socket type %d\n", 10751da177e4SLinus Torvalds p->type); 10761da177e4SLinus Torvalds goto out; 10771da177e4SLinus Torvalds } 10783d1427f8SEric Dumazet EXPORT_SYMBOL(inet_register_protosw); 10791da177e4SLinus Torvalds 10801da177e4SLinus Torvalds void inet_unregister_protosw(struct inet_protosw *p) 10811da177e4SLinus Torvalds { 10821da177e4SLinus Torvalds if (INET_PROTOSW_PERMANENT & p->flags) { 1083058bd4d2SJoe Perches pr_err("Attempt to unregister permanent protocol %d\n", 10841da177e4SLinus Torvalds p->protocol); 10851da177e4SLinus Torvalds } else { 10861da177e4SLinus Torvalds spin_lock_bh(&inetsw_lock); 10871da177e4SLinus Torvalds list_del_rcu(&p->list); 10881da177e4SLinus Torvalds spin_unlock_bh(&inetsw_lock); 10891da177e4SLinus Torvalds 10901da177e4SLinus Torvalds synchronize_net(); 10911da177e4SLinus Torvalds } 10921da177e4SLinus Torvalds } 10933d1427f8SEric Dumazet EXPORT_SYMBOL(inet_unregister_protosw); 10941da177e4SLinus Torvalds 109532519f11SArnaldo Carvalho de Melo /* 109632519f11SArnaldo Carvalho de Melo * Shall we try to damage output packets if routing dev changes? 109732519f11SArnaldo Carvalho de Melo */ 109832519f11SArnaldo Carvalho de Melo 1099ab32ea5dSBrian Haley int sysctl_ip_dynaddr __read_mostly; 110032519f11SArnaldo Carvalho de Melo 110132519f11SArnaldo Carvalho de Melo static int inet_sk_reselect_saddr(struct sock *sk) 110232519f11SArnaldo Carvalho de Melo { 110332519f11SArnaldo Carvalho de Melo struct inet_sock *inet = inet_sk(sk); 1104c720c7e8SEric Dumazet __be32 old_saddr = inet->inet_saddr; 1105c720c7e8SEric Dumazet __be32 daddr = inet->inet_daddr; 11066e869138SDavid S. Miller struct flowi4 *fl4; 1107b23dd4feSDavid S. Miller struct rtable *rt; 1108b23dd4feSDavid S. Miller __be32 new_saddr; 1109f6d8bd05SEric Dumazet struct ip_options_rcu *inet_opt; 111032519f11SArnaldo Carvalho de Melo 1111f6d8bd05SEric Dumazet inet_opt = rcu_dereference_protected(inet->inet_opt, 1112f6d8bd05SEric Dumazet sock_owned_by_user(sk)); 1113f6d8bd05SEric Dumazet if (inet_opt && inet_opt->opt.srr) 1114f6d8bd05SEric Dumazet daddr = inet_opt->opt.faddr; 111532519f11SArnaldo Carvalho de Melo 111632519f11SArnaldo Carvalho de Melo /* Query new route. */ 11176e869138SDavid S. Miller fl4 = &inet->cork.fl.u.ip4; 11186e869138SDavid S. Miller rt = ip_route_connect(fl4, daddr, 0, RT_CONN_FLAGS(sk), 1119b23dd4feSDavid S. Miller sk->sk_bound_dev_if, sk->sk_protocol, 11200e0d44abSSteffen Klassert inet->inet_sport, inet->inet_dport, sk); 1121b23dd4feSDavid S. Miller if (IS_ERR(rt)) 1122b23dd4feSDavid S. Miller return PTR_ERR(rt); 112332519f11SArnaldo Carvalho de Melo 1124d8d1f30bSChangli Gao sk_setup_caps(sk, &rt->dst); 112532519f11SArnaldo Carvalho de Melo 11266e869138SDavid S. Miller new_saddr = fl4->saddr; 112732519f11SArnaldo Carvalho de Melo 112832519f11SArnaldo Carvalho de Melo if (new_saddr == old_saddr) 112932519f11SArnaldo Carvalho de Melo return 0; 113032519f11SArnaldo Carvalho de Melo 113132519f11SArnaldo Carvalho de Melo if (sysctl_ip_dynaddr > 1) { 1132058bd4d2SJoe Perches pr_info("%s(): shifting inet->saddr from %pI4 to %pI4\n", 1133673d57e7SHarvey Harrison __func__, &old_saddr, &new_saddr); 113432519f11SArnaldo Carvalho de Melo } 113532519f11SArnaldo Carvalho de Melo 1136c720c7e8SEric Dumazet inet->inet_saddr = inet->inet_rcv_saddr = new_saddr; 113732519f11SArnaldo Carvalho de Melo 113832519f11SArnaldo Carvalho de Melo /* 113932519f11SArnaldo Carvalho de Melo * XXX The only one ugly spot where we need to 114032519f11SArnaldo Carvalho de Melo * XXX really change the sockets identity after 114132519f11SArnaldo Carvalho de Melo * XXX it has entered the hashes. -DaveM 114232519f11SArnaldo Carvalho de Melo * 114332519f11SArnaldo Carvalho de Melo * Besides that, it does not check for connection 114432519f11SArnaldo Carvalho de Melo * uniqueness. Wait for troubles. 114532519f11SArnaldo Carvalho de Melo */ 114632519f11SArnaldo Carvalho de Melo __sk_prot_rehash(sk); 114732519f11SArnaldo Carvalho de Melo return 0; 114832519f11SArnaldo Carvalho de Melo } 114932519f11SArnaldo Carvalho de Melo 115032519f11SArnaldo Carvalho de Melo int inet_sk_rebuild_header(struct sock *sk) 115132519f11SArnaldo Carvalho de Melo { 115232519f11SArnaldo Carvalho de Melo struct inet_sock *inet = inet_sk(sk); 115332519f11SArnaldo Carvalho de Melo struct rtable *rt = (struct rtable *)__sk_dst_check(sk, 0); 11543ca3c68eSAl Viro __be32 daddr; 1155f6d8bd05SEric Dumazet struct ip_options_rcu *inet_opt; 11566e869138SDavid S. Miller struct flowi4 *fl4; 115732519f11SArnaldo Carvalho de Melo int err; 115832519f11SArnaldo Carvalho de Melo 115932519f11SArnaldo Carvalho de Melo /* Route is OK, nothing to do. */ 116032519f11SArnaldo Carvalho de Melo if (rt) 116132519f11SArnaldo Carvalho de Melo return 0; 116232519f11SArnaldo Carvalho de Melo 116332519f11SArnaldo Carvalho de Melo /* Reroute. */ 1164f6d8bd05SEric Dumazet rcu_read_lock(); 1165f6d8bd05SEric Dumazet inet_opt = rcu_dereference(inet->inet_opt); 1166c720c7e8SEric Dumazet daddr = inet->inet_daddr; 1167f6d8bd05SEric Dumazet if (inet_opt && inet_opt->opt.srr) 1168f6d8bd05SEric Dumazet daddr = inet_opt->opt.faddr; 1169f6d8bd05SEric Dumazet rcu_read_unlock(); 11706e869138SDavid S. Miller fl4 = &inet->cork.fl.u.ip4; 11716e869138SDavid S. Miller rt = ip_route_output_ports(sock_net(sk), fl4, sk, daddr, inet->inet_saddr, 117278fbfd8aSDavid S. Miller inet->inet_dport, inet->inet_sport, 117378fbfd8aSDavid S. Miller sk->sk_protocol, RT_CONN_FLAGS(sk), 117478fbfd8aSDavid S. Miller sk->sk_bound_dev_if); 1175b23dd4feSDavid S. Miller if (!IS_ERR(rt)) { 1176b23dd4feSDavid S. Miller err = 0; 1177d8d1f30bSChangli Gao sk_setup_caps(sk, &rt->dst); 1178b23dd4feSDavid S. Miller } else { 1179b23dd4feSDavid S. Miller err = PTR_ERR(rt); 1180b23dd4feSDavid S. Miller 118132519f11SArnaldo Carvalho de Melo /* Routing failed... */ 118232519f11SArnaldo Carvalho de Melo sk->sk_route_caps = 0; 118332519f11SArnaldo Carvalho de Melo /* 118432519f11SArnaldo Carvalho de Melo * Other protocols have to map its equivalent state to TCP_SYN_SENT. 118532519f11SArnaldo Carvalho de Melo * DCCP maps its DCCP_REQUESTING state to TCP_SYN_SENT. -acme 118632519f11SArnaldo Carvalho de Melo */ 118732519f11SArnaldo Carvalho de Melo if (!sysctl_ip_dynaddr || 118832519f11SArnaldo Carvalho de Melo sk->sk_state != TCP_SYN_SENT || 118932519f11SArnaldo Carvalho de Melo (sk->sk_userlocks & SOCK_BINDADDR_LOCK) || 119032519f11SArnaldo Carvalho de Melo (err = inet_sk_reselect_saddr(sk)) != 0) 119132519f11SArnaldo Carvalho de Melo sk->sk_err_soft = -err; 119232519f11SArnaldo Carvalho de Melo } 119332519f11SArnaldo Carvalho de Melo 119432519f11SArnaldo Carvalho de Melo return err; 119532519f11SArnaldo Carvalho de Melo } 119632519f11SArnaldo Carvalho de Melo EXPORT_SYMBOL(inet_sk_rebuild_header); 119732519f11SArnaldo Carvalho de Melo 1198c8f44affSMichał Mirosław static struct sk_buff *inet_gso_segment(struct sk_buff *skb, 1199c8f44affSMichał Mirosław netdev_features_t features) 1200f4c50d99SHerbert Xu { 1201f4c50d99SHerbert Xu struct sk_buff *segs = ERR_PTR(-EINVAL); 1202bca49f84SVlad Yasevich const struct net_offload *ops; 12033347c960SEric Dumazet unsigned int offset = 0; 12048c3a897bSEric Dumazet bool udpfrag, encap; 1205f9242b6bSDavid S. Miller struct iphdr *iph; 1206f4c50d99SHerbert Xu int proto; 12073347c960SEric Dumazet int nhoff; 1208f4c50d99SHerbert Xu int ihl; 1209f4c50d99SHerbert Xu int id; 1210f4c50d99SHerbert Xu 1211bbcf467dSHerbert Xu if (unlikely(skb_shinfo(skb)->gso_type & 1212bbcf467dSHerbert Xu ~(SKB_GSO_TCPV4 | 1213bbcf467dSHerbert Xu SKB_GSO_UDP | 1214bbcf467dSHerbert Xu SKB_GSO_DODGY | 1215bbcf467dSHerbert Xu SKB_GSO_TCP_ECN | 121668c33163SPravin B Shelar SKB_GSO_GRE | 12174749c09cSTom Herbert SKB_GSO_GRE_CSUM | 1218cb32f511SEric Dumazet SKB_GSO_IPIP | 121961c1db7fSEric Dumazet SKB_GSO_SIT | 12209b3eb5edSPravin B Shelar SKB_GSO_TCPV6 | 122173136267SPravin B Shelar SKB_GSO_UDP_TUNNEL | 12220f4f4ffaSTom Herbert SKB_GSO_UDP_TUNNEL_CSUM | 1223e585f236STom Herbert SKB_GSO_TUNNEL_REMCSUM | 1224bbcf467dSHerbert Xu 0))) 1225bbcf467dSHerbert Xu goto out; 1226bbcf467dSHerbert Xu 12273347c960SEric Dumazet skb_reset_network_header(skb); 12283347c960SEric Dumazet nhoff = skb_network_header(skb) - skb_mac_header(skb); 1229bbcf467dSHerbert Xu if (unlikely(!pskb_may_pull(skb, sizeof(*iph)))) 1230f4c50d99SHerbert Xu goto out; 1231f4c50d99SHerbert Xu 1232eddc9ec5SArnaldo Carvalho de Melo iph = ip_hdr(skb); 1233f4c50d99SHerbert Xu ihl = iph->ihl * 4; 1234f4c50d99SHerbert Xu if (ihl < sizeof(*iph)) 1235f4c50d99SHerbert Xu goto out; 1236f4c50d99SHerbert Xu 123747d27aadSEric Dumazet id = ntohs(iph->id); 123847d27aadSEric Dumazet proto = iph->protocol; 123947d27aadSEric Dumazet 124047d27aadSEric Dumazet /* Warning: after this point, iph might be no longer valid */ 1241bbcf467dSHerbert Xu if (unlikely(!pskb_may_pull(skb, ihl))) 1242f4c50d99SHerbert Xu goto out; 124347d27aadSEric Dumazet __skb_pull(skb, ihl); 1244f4c50d99SHerbert Xu 12458c3a897bSEric Dumazet encap = SKB_GSO_CB(skb)->encap_level > 0; 12468c3a897bSEric Dumazet if (encap) 12471e16aa3dSFlorian Westphal features &= skb->dev->hw_enc_features; 12483347c960SEric Dumazet SKB_GSO_CB(skb)->encap_level += ihl; 124973136267SPravin B Shelar 1250badff6d0SArnaldo Carvalho de Melo skb_reset_transport_header(skb); 125147d27aadSEric Dumazet 1252f4c50d99SHerbert Xu segs = ERR_PTR(-EPROTONOSUPPORT); 1253f4c50d99SHerbert Xu 125491a48a2eSHannes Frederic Sowa if (skb->encapsulation && 125591a48a2eSHannes Frederic Sowa skb_shinfo(skb)->gso_type & (SKB_GSO_SIT|SKB_GSO_IPIP)) 125691a48a2eSHannes Frederic Sowa udpfrag = proto == IPPROTO_UDP && encap; 125791a48a2eSHannes Frederic Sowa else 125891a48a2eSHannes Frederic Sowa udpfrag = proto == IPPROTO_UDP && !skb->encapsulation; 1259dcd60771SEric Dumazet 1260bca49f84SVlad Yasevich ops = rcu_dereference(inet_offloads[proto]); 1261f191a1d1SVlad Yasevich if (likely(ops && ops->callbacks.gso_segment)) 1262f191a1d1SVlad Yasevich segs = ops->callbacks.gso_segment(skb, features); 1263f4c50d99SHerbert Xu 126450c3a487SYOSHIFUJI Hideaki / 吉藤英明 if (IS_ERR_OR_NULL(segs)) 1265f4c50d99SHerbert Xu goto out; 1266f4c50d99SHerbert Xu 1267f4c50d99SHerbert Xu skb = segs; 1268f4c50d99SHerbert Xu do { 12693347c960SEric Dumazet iph = (struct iphdr *)(skb_mac_header(skb) + nhoff); 12708c3a897bSEric Dumazet if (udpfrag) { 1271d7ca4cc0SSridhar Samudrala iph->id = htons(id); 1272d7ca4cc0SSridhar Samudrala iph->frag_off = htons(offset >> 3); 127300db4124SIan Morris if (skb->next) 1274d7ca4cc0SSridhar Samudrala iph->frag_off |= htons(IP_MF); 12753347c960SEric Dumazet offset += skb->len - nhoff - ihl; 1276490ab081SPravin B Shelar } else { 1277f4c50d99SHerbert Xu iph->id = htons(id++); 1278490ab081SPravin B Shelar } 12793347c960SEric Dumazet iph->tot_len = htons(skb->len - nhoff); 128047d27aadSEric Dumazet ip_send_check(iph); 12818c3a897bSEric Dumazet if (encap) 12823347c960SEric Dumazet skb_reset_inner_headers(skb); 12833347c960SEric Dumazet skb->network_header = (u8 *)iph - skb->head; 1284f4c50d99SHerbert Xu } while ((skb = skb->next)); 1285f4c50d99SHerbert Xu 1286f4c50d99SHerbert Xu out: 1287f4c50d99SHerbert Xu return segs; 1288f4c50d99SHerbert Xu } 1289f4c50d99SHerbert Xu 129073cc19f1SHerbert Xu static struct sk_buff **inet_gro_receive(struct sk_buff **head, 129173cc19f1SHerbert Xu struct sk_buff *skb) 129273cc19f1SHerbert Xu { 1293bca49f84SVlad Yasevich const struct net_offload *ops; 129473cc19f1SHerbert Xu struct sk_buff **pp = NULL; 129573cc19f1SHerbert Xu struct sk_buff *p; 1296b71d1d42SEric Dumazet const struct iphdr *iph; 1297a5b1cf28SHerbert Xu unsigned int hlen; 1298a5b1cf28SHerbert Xu unsigned int off; 12991075f3f6SHerbert Xu unsigned int id; 130073cc19f1SHerbert Xu int flush = 1; 130173cc19f1SHerbert Xu int proto; 130273cc19f1SHerbert Xu 1303a5b1cf28SHerbert Xu off = skb_gro_offset(skb); 1304a5b1cf28SHerbert Xu hlen = off + sizeof(*iph); 1305a5b1cf28SHerbert Xu iph = skb_gro_header_fast(skb, off); 1306a5b1cf28SHerbert Xu if (skb_gro_header_hard(skb, hlen)) { 1307a5b1cf28SHerbert Xu iph = skb_gro_header_slow(skb, hlen, off); 130886911732SHerbert Xu if (unlikely(!iph)) 130973cc19f1SHerbert Xu goto out; 1310a5b1cf28SHerbert Xu } 131173cc19f1SHerbert Xu 1312f9242b6bSDavid S. Miller proto = iph->protocol; 131373cc19f1SHerbert Xu 131473cc19f1SHerbert Xu rcu_read_lock(); 1315bca49f84SVlad Yasevich ops = rcu_dereference(inet_offloads[proto]); 1316f191a1d1SVlad Yasevich if (!ops || !ops->callbacks.gro_receive) 131773cc19f1SHerbert Xu goto out_unlock; 131873cc19f1SHerbert Xu 1319a5ad24beSHerbert Xu if (*(u8 *)iph != 0x45) 132073cc19f1SHerbert Xu goto out_unlock; 132173cc19f1SHerbert Xu 1322a9e050f4SEric Dumazet if (unlikely(ip_fast_csum((u8 *)iph, 5))) 132373cc19f1SHerbert Xu goto out_unlock; 132473cc19f1SHerbert Xu 13250eae88f3SEric Dumazet id = ntohl(*(__be32 *)&iph->id); 1326db8caf3dSEric Dumazet flush = (u16)((ntohl(*(__be32 *)iph) ^ skb_gro_len(skb)) | (id & ~IP_DF)); 13271075f3f6SHerbert Xu id >>= 16; 132873cc19f1SHerbert Xu 132973cc19f1SHerbert Xu for (p = *head; p; p = p->next) { 133073cc19f1SHerbert Xu struct iphdr *iph2; 133173cc19f1SHerbert Xu 133273cc19f1SHerbert Xu if (!NAPI_GRO_CB(p)->same_flow) 133373cc19f1SHerbert Xu continue; 133473cc19f1SHerbert Xu 1335299603e8SJerry Chu iph2 = (struct iphdr *)(p->data + off); 1336299603e8SJerry Chu /* The above works because, with the exception of the top 1337299603e8SJerry Chu * (inner most) layer, we only aggregate pkts with the same 1338299603e8SJerry Chu * hdr length so all the hdrs we'll need to verify will start 1339299603e8SJerry Chu * at the same offset. 1340299603e8SJerry Chu */ 1341a5ad24beSHerbert Xu if ((iph->protocol ^ iph2->protocol) | 13420eae88f3SEric Dumazet ((__force u32)iph->saddr ^ (__force u32)iph2->saddr) | 13430eae88f3SEric Dumazet ((__force u32)iph->daddr ^ (__force u32)iph2->daddr)) { 134473cc19f1SHerbert Xu NAPI_GRO_CB(p)->same_flow = 0; 134573cc19f1SHerbert Xu continue; 134673cc19f1SHerbert Xu } 134773cc19f1SHerbert Xu 134873cc19f1SHerbert Xu /* All fields must match except length and checksum. */ 134973cc19f1SHerbert Xu NAPI_GRO_CB(p)->flush |= 1350a5ad24beSHerbert Xu (iph->ttl ^ iph2->ttl) | 1351a9e050f4SEric Dumazet (iph->tos ^ iph2->tos) | 1352bf5a755fSJerry Chu ((iph->frag_off ^ iph2->frag_off) & htons(IP_DF)); 135373cc19f1SHerbert Xu 1354bf5a755fSJerry Chu /* Save the IP ID check to be included later when we get to 1355bf5a755fSJerry Chu * the transport layer so only the inner most IP ID is checked. 1356bf5a755fSJerry Chu * This is because some GSO/TSO implementations do not 1357bf5a755fSJerry Chu * correctly increment the IP ID for the outer hdrs. 1358bf5a755fSJerry Chu */ 1359bf5a755fSJerry Chu NAPI_GRO_CB(p)->flush_id = 1360bf5a755fSJerry Chu ((u16)(ntohs(iph2->id) + NAPI_GRO_CB(p)->count) ^ id); 136173cc19f1SHerbert Xu NAPI_GRO_CB(p)->flush |= flush; 136273cc19f1SHerbert Xu } 136373cc19f1SHerbert Xu 136473cc19f1SHerbert Xu NAPI_GRO_CB(skb)->flush |= flush; 1365299603e8SJerry Chu skb_set_network_header(skb, off); 1366299603e8SJerry Chu /* The above will be needed by the transport layer if there is one 1367299603e8SJerry Chu * immediately following this IP hdr. 1368299603e8SJerry Chu */ 1369299603e8SJerry Chu 13702c804d0fSEric Dumazet /* Note : No need to call skb_gro_postpull_rcsum() here, 13712c804d0fSEric Dumazet * as we already checked checksum over ipv4 header was 0 13722c804d0fSEric Dumazet */ 137386911732SHerbert Xu skb_gro_pull(skb, sizeof(*iph)); 137486911732SHerbert Xu skb_set_transport_header(skb, skb_gro_offset(skb)); 137573cc19f1SHerbert Xu 1376f191a1d1SVlad Yasevich pp = ops->callbacks.gro_receive(head, skb); 137773cc19f1SHerbert Xu 137873cc19f1SHerbert Xu out_unlock: 137973cc19f1SHerbert Xu rcu_read_unlock(); 138073cc19f1SHerbert Xu 138173cc19f1SHerbert Xu out: 138273cc19f1SHerbert Xu NAPI_GRO_CB(skb)->flush |= flush; 138373cc19f1SHerbert Xu 138473cc19f1SHerbert Xu return pp; 138573cc19f1SHerbert Xu } 138673cc19f1SHerbert Xu 1387f4713a3dSWillem de Bruijn int inet_recv_error(struct sock *sk, struct msghdr *msg, int len, int *addr_len) 1388f4713a3dSWillem de Bruijn { 1389f4713a3dSWillem de Bruijn if (sk->sk_family == AF_INET) 1390f4713a3dSWillem de Bruijn return ip_recv_error(sk, msg, len, addr_len); 1391f4713a3dSWillem de Bruijn #if IS_ENABLED(CONFIG_IPV6) 1392f4713a3dSWillem de Bruijn if (sk->sk_family == AF_INET6) 1393f4713a3dSWillem de Bruijn return pingv6_ops.ipv6_recv_error(sk, msg, len, addr_len); 1394f4713a3dSWillem de Bruijn #endif 1395f4713a3dSWillem de Bruijn return -EINVAL; 1396f4713a3dSWillem de Bruijn } 1397f4713a3dSWillem de Bruijn 1398299603e8SJerry Chu static int inet_gro_complete(struct sk_buff *skb, int nhoff) 139973cc19f1SHerbert Xu { 1400299603e8SJerry Chu __be16 newlen = htons(skb->len - nhoff); 1401299603e8SJerry Chu struct iphdr *iph = (struct iphdr *)(skb->data + nhoff); 1402bca49f84SVlad Yasevich const struct net_offload *ops; 1403f9242b6bSDavid S. Miller int proto = iph->protocol; 1404f9242b6bSDavid S. Miller int err = -ENOSYS; 140573cc19f1SHerbert Xu 1406c3caf119SJerry Chu if (skb->encapsulation) 1407c3caf119SJerry Chu skb_set_inner_network_header(skb, nhoff); 1408c3caf119SJerry Chu 140973cc19f1SHerbert Xu csum_replace2(&iph->check, iph->tot_len, newlen); 141073cc19f1SHerbert Xu iph->tot_len = newlen; 141173cc19f1SHerbert Xu 141273cc19f1SHerbert Xu rcu_read_lock(); 1413bca49f84SVlad Yasevich ops = rcu_dereference(inet_offloads[proto]); 1414f191a1d1SVlad Yasevich if (WARN_ON(!ops || !ops->callbacks.gro_complete)) 141573cc19f1SHerbert Xu goto out_unlock; 141673cc19f1SHerbert Xu 1417299603e8SJerry Chu /* Only need to add sizeof(*iph) to get to the next hdr below 1418299603e8SJerry Chu * because any hdr with option will have been flushed in 1419299603e8SJerry Chu * inet_gro_receive(). 1420299603e8SJerry Chu */ 1421299603e8SJerry Chu err = ops->callbacks.gro_complete(skb, nhoff + sizeof(*iph)); 142273cc19f1SHerbert Xu 142373cc19f1SHerbert Xu out_unlock: 142473cc19f1SHerbert Xu rcu_read_unlock(); 142573cc19f1SHerbert Xu 142673cc19f1SHerbert Xu return err; 142773cc19f1SHerbert Xu } 142873cc19f1SHerbert Xu 1429eee4fe4dSDenis V. Lunev int inet_ctl_sock_create(struct sock **sk, unsigned short family, 14305677242fSDenis V. Lunev unsigned short type, unsigned char protocol, 14315677242fSDenis V. Lunev struct net *net) 14323d58b5faSDenis V. Lunev { 1433eee4fe4dSDenis V. Lunev struct socket *sock; 143426abe143SEric W. Biederman int rc = sock_create_kern(net, family, type, protocol, &sock); 14353d58b5faSDenis V. Lunev 14363d58b5faSDenis V. Lunev if (rc == 0) { 1437eee4fe4dSDenis V. Lunev *sk = sock->sk; 1438eee4fe4dSDenis V. Lunev (*sk)->sk_allocation = GFP_ATOMIC; 14393d58b5faSDenis V. Lunev /* 14403d58b5faSDenis V. Lunev * Unhash it so that IP input processing does not even see it, 14413d58b5faSDenis V. Lunev * we do not wish this socket to see incoming packets. 14423d58b5faSDenis V. Lunev */ 1443eee4fe4dSDenis V. Lunev (*sk)->sk_prot->unhash(*sk); 14443d58b5faSDenis V. Lunev } 14453d58b5faSDenis V. Lunev return rc; 14463d58b5faSDenis V. Lunev } 14473d58b5faSDenis V. Lunev EXPORT_SYMBOL_GPL(inet_ctl_sock_create); 14483d58b5faSDenis V. Lunev 1449698365faSWANG Cong unsigned long snmp_fold_field(void __percpu *mib, int offt) 14505e0f0435SHerbert Xu { 14515e0f0435SHerbert Xu unsigned long res = 0; 1452698365faSWANG Cong int i; 14535e0f0435SHerbert Xu 1454698365faSWANG Cong for_each_possible_cpu(i) 1455698365faSWANG Cong res += *(((unsigned long *) per_cpu_ptr(mib, i)) + offt); 14565e0f0435SHerbert Xu return res; 14575e0f0435SHerbert Xu } 14585e0f0435SHerbert Xu EXPORT_SYMBOL_GPL(snmp_fold_field); 14595e0f0435SHerbert Xu 14604ce3c183SEric Dumazet #if BITS_PER_LONG==32 14614ce3c183SEric Dumazet 1462698365faSWANG Cong u64 snmp_fold_field64(void __percpu *mib, int offt, size_t syncp_offset) 14634ce3c183SEric Dumazet { 14644ce3c183SEric Dumazet u64 res = 0; 14654ce3c183SEric Dumazet int cpu; 14664ce3c183SEric Dumazet 14674ce3c183SEric Dumazet for_each_possible_cpu(cpu) { 14688f0ea0feSEric Dumazet void *bhptr; 14694ce3c183SEric Dumazet struct u64_stats_sync *syncp; 14708f0ea0feSEric Dumazet u64 v; 14714ce3c183SEric Dumazet unsigned int start; 14724ce3c183SEric Dumazet 1473698365faSWANG Cong bhptr = per_cpu_ptr(mib, cpu); 14744ce3c183SEric Dumazet syncp = (struct u64_stats_sync *)(bhptr + syncp_offset); 14754ce3c183SEric Dumazet do { 147657a7744eSEric W. Biederman start = u64_stats_fetch_begin_irq(syncp); 14778f0ea0feSEric Dumazet v = *(((u64 *) bhptr) + offt); 147857a7744eSEric W. Biederman } while (u64_stats_fetch_retry_irq(syncp, start)); 14794ce3c183SEric Dumazet 14808f0ea0feSEric Dumazet res += v; 14814ce3c183SEric Dumazet } 14824ce3c183SEric Dumazet return res; 14834ce3c183SEric Dumazet } 14844ce3c183SEric Dumazet EXPORT_SYMBOL_GPL(snmp_fold_field64); 14854ce3c183SEric Dumazet #endif 14864ce3c183SEric Dumazet 14871da177e4SLinus Torvalds #ifdef CONFIG_IP_MULTICAST 148832613090SAlexey Dobriyan static const struct net_protocol igmp_protocol = { 14891da177e4SLinus Torvalds .handler = igmp_rcv, 1490b4ee07dfSAlexey Dobriyan .netns_ok = 1, 14911da177e4SLinus Torvalds }; 14921da177e4SLinus Torvalds #endif 14931da177e4SLinus Torvalds 149432613090SAlexey Dobriyan static const struct net_protocol tcp_protocol = { 149541063e9dSDavid S. Miller .early_demux = tcp_v4_early_demux, 14961da177e4SLinus Torvalds .handler = tcp_v4_rcv, 14971da177e4SLinus Torvalds .err_handler = tcp_v4_err, 14981da177e4SLinus Torvalds .no_policy = 1, 149992f1fecbSDenis V. Lunev .netns_ok = 1, 15008ed1dc44SHannes Frederic Sowa .icmp_strict_tag_validation = 1, 15011da177e4SLinus Torvalds }; 15021da177e4SLinus Torvalds 150332613090SAlexey Dobriyan static const struct net_protocol udp_protocol = { 1504421b3885SShawn Bohrer .early_demux = udp_v4_early_demux, 15051da177e4SLinus Torvalds .handler = udp_rcv, 15061da177e4SLinus Torvalds .err_handler = udp_err, 15071da177e4SLinus Torvalds .no_policy = 1, 150892f1fecbSDenis V. Lunev .netns_ok = 1, 15091da177e4SLinus Torvalds }; 15101da177e4SLinus Torvalds 151132613090SAlexey Dobriyan static const struct net_protocol icmp_protocol = { 15121da177e4SLinus Torvalds .handler = icmp_rcv, 15135b052042SLi Wei .err_handler = icmp_err, 15148b7817f3SHerbert Xu .no_policy = 1, 151592f1fecbSDenis V. Lunev .netns_ok = 1, 15161da177e4SLinus Torvalds }; 15171da177e4SLinus Torvalds 15189b4661bdSPavel Emelyanov static __net_init int ipv4_mib_init_net(struct net *net) 15199b4661bdSPavel Emelyanov { 1520827da44cSJohn Stultz int i; 1521827da44cSJohn Stultz 1522698365faSWANG Cong net->mib.tcp_statistics = alloc_percpu(struct tcp_mib); 1523698365faSWANG Cong if (!net->mib.tcp_statistics) 152457ef42d5SPavel Emelyanov goto err_tcp_mib; 1525698365faSWANG Cong net->mib.ip_statistics = alloc_percpu(struct ipstats_mib); 1526698365faSWANG Cong if (!net->mib.ip_statistics) 1527a20f5799SPavel Emelyanov goto err_ip_mib; 1528827da44cSJohn Stultz 1529827da44cSJohn Stultz for_each_possible_cpu(i) { 1530827da44cSJohn Stultz struct ipstats_mib *af_inet_stats; 1531698365faSWANG Cong af_inet_stats = per_cpu_ptr(net->mib.ip_statistics, i); 1532827da44cSJohn Stultz u64_stats_init(&af_inet_stats->syncp); 1533827da44cSJohn Stultz } 1534827da44cSJohn Stultz 1535698365faSWANG Cong net->mib.net_statistics = alloc_percpu(struct linux_mib); 1536698365faSWANG Cong if (!net->mib.net_statistics) 153761a7e260SPavel Emelyanov goto err_net_mib; 1538698365faSWANG Cong net->mib.udp_statistics = alloc_percpu(struct udp_mib); 1539698365faSWANG Cong if (!net->mib.udp_statistics) 15402f275f91SPavel Emelyanov goto err_udp_mib; 1541698365faSWANG Cong net->mib.udplite_statistics = alloc_percpu(struct udp_mib); 1542698365faSWANG Cong if (!net->mib.udplite_statistics) 1543386019d3SPavel Emelyanov goto err_udplite_mib; 1544698365faSWANG Cong net->mib.icmp_statistics = alloc_percpu(struct icmp_mib); 1545698365faSWANG Cong if (!net->mib.icmp_statistics) 1546b60538a0SPavel Emelyanov goto err_icmp_mib; 1547acb32ba3SEric Dumazet net->mib.icmpmsg_statistics = kzalloc(sizeof(struct icmpmsg_mib), 1548acb32ba3SEric Dumazet GFP_KERNEL); 1549acb32ba3SEric Dumazet if (!net->mib.icmpmsg_statistics) 1550923c6586SPavel Emelyanov goto err_icmpmsg_mib; 155157ef42d5SPavel Emelyanov 155257ef42d5SPavel Emelyanov tcp_mib_init(net); 15539b4661bdSPavel Emelyanov return 0; 155457ef42d5SPavel Emelyanov 1555923c6586SPavel Emelyanov err_icmpmsg_mib: 1556698365faSWANG Cong free_percpu(net->mib.icmp_statistics); 1557b60538a0SPavel Emelyanov err_icmp_mib: 1558698365faSWANG Cong free_percpu(net->mib.udplite_statistics); 1559386019d3SPavel Emelyanov err_udplite_mib: 1560698365faSWANG Cong free_percpu(net->mib.udp_statistics); 15612f275f91SPavel Emelyanov err_udp_mib: 1562698365faSWANG Cong free_percpu(net->mib.net_statistics); 156361a7e260SPavel Emelyanov err_net_mib: 1564698365faSWANG Cong free_percpu(net->mib.ip_statistics); 1565a20f5799SPavel Emelyanov err_ip_mib: 1566698365faSWANG Cong free_percpu(net->mib.tcp_statistics); 156757ef42d5SPavel Emelyanov err_tcp_mib: 156857ef42d5SPavel Emelyanov return -ENOMEM; 15699b4661bdSPavel Emelyanov } 15709b4661bdSPavel Emelyanov 15719b4661bdSPavel Emelyanov static __net_exit void ipv4_mib_exit_net(struct net *net) 15729b4661bdSPavel Emelyanov { 1573acb32ba3SEric Dumazet kfree(net->mib.icmpmsg_statistics); 1574698365faSWANG Cong free_percpu(net->mib.icmp_statistics); 1575698365faSWANG Cong free_percpu(net->mib.udplite_statistics); 1576698365faSWANG Cong free_percpu(net->mib.udp_statistics); 1577698365faSWANG Cong free_percpu(net->mib.net_statistics); 1578698365faSWANG Cong free_percpu(net->mib.ip_statistics); 1579698365faSWANG Cong free_percpu(net->mib.tcp_statistics); 15809b4661bdSPavel Emelyanov } 15819b4661bdSPavel Emelyanov 15829b4661bdSPavel Emelyanov static __net_initdata struct pernet_operations ipv4_mib_ops = { 15839b4661bdSPavel Emelyanov .init = ipv4_mib_init_net, 15849b4661bdSPavel Emelyanov .exit = ipv4_mib_exit_net, 15859b4661bdSPavel Emelyanov }; 15869b4661bdSPavel Emelyanov 15871da177e4SLinus Torvalds static int __init init_ipv4_mibs(void) 15881da177e4SLinus Torvalds { 1589d89cbbb1SPavel Emelyanov return register_pernet_subsys(&ipv4_mib_ops); 15901da177e4SLinus Torvalds } 15911da177e4SLinus Torvalds 1592c9d8f1a6SCong Wang static __net_init int inet_init_net(struct net *net) 1593c9d8f1a6SCong Wang { 1594c9d8f1a6SCong Wang /* 1595c9d8f1a6SCong Wang * Set defaults for local port range 1596c9d8f1a6SCong Wang */ 1597c9d8f1a6SCong Wang seqlock_init(&net->ipv4.ip_local_ports.lock); 1598c9d8f1a6SCong Wang net->ipv4.ip_local_ports.range[0] = 32768; 159907f4c900SEric Dumazet net->ipv4.ip_local_ports.range[1] = 60999; 1600ba6b918aSCong Wang 1601ba6b918aSCong Wang seqlock_init(&net->ipv4.ping_group_range.lock); 1602ba6b918aSCong Wang /* 1603ba6b918aSCong Wang * Sane defaults - nobody may create ping sockets. 1604ba6b918aSCong Wang * Boot scripts should set this to distro-specific group. 1605ba6b918aSCong Wang */ 1606ba6b918aSCong Wang net->ipv4.ping_group_range.range[0] = make_kgid(&init_user_ns, 1); 1607ba6b918aSCong Wang net->ipv4.ping_group_range.range[1] = make_kgid(&init_user_ns, 0); 1608c9d8f1a6SCong Wang return 0; 1609c9d8f1a6SCong Wang } 1610c9d8f1a6SCong Wang 1611c9d8f1a6SCong Wang static __net_exit void inet_exit_net(struct net *net) 1612c9d8f1a6SCong Wang { 1613c9d8f1a6SCong Wang } 1614c9d8f1a6SCong Wang 1615c9d8f1a6SCong Wang static __net_initdata struct pernet_operations af_inet_ops = { 1616c9d8f1a6SCong Wang .init = inet_init_net, 1617c9d8f1a6SCong Wang .exit = inet_exit_net, 1618c9d8f1a6SCong Wang }; 1619c9d8f1a6SCong Wang 1620c9d8f1a6SCong Wang static int __init init_inet_pernet_ops(void) 1621c9d8f1a6SCong Wang { 1622c9d8f1a6SCong Wang return register_pernet_subsys(&af_inet_ops); 1623c9d8f1a6SCong Wang } 1624c9d8f1a6SCong Wang 16251da177e4SLinus Torvalds static int ipv4_proc_init(void); 16261da177e4SLinus Torvalds 162730e224d7SHerbert Xu /* 162830e224d7SHerbert Xu * IP protocol layer initialiser 162930e224d7SHerbert Xu */ 163030e224d7SHerbert Xu 163122061d80SVlad Yasevich static struct packet_offload ip_packet_offload __read_mostly = { 163222061d80SVlad Yasevich .type = cpu_to_be16(ETH_P_IP), 1633f191a1d1SVlad Yasevich .callbacks = { 1634f4c50d99SHerbert Xu .gso_segment = inet_gso_segment, 163573cc19f1SHerbert Xu .gro_receive = inet_gro_receive, 163673cc19f1SHerbert Xu .gro_complete = inet_gro_complete, 1637f191a1d1SVlad Yasevich }, 163830e224d7SHerbert Xu }; 163930e224d7SHerbert Xu 1640cb32f511SEric Dumazet static const struct net_offload ipip_offload = { 1641cb32f511SEric Dumazet .callbacks = { 1642cb32f511SEric Dumazet .gso_segment = inet_gso_segment, 16439667e9bbSTom Herbert .gro_receive = inet_gro_receive, 16449667e9bbSTom Herbert .gro_complete = inet_gro_complete, 1645cb32f511SEric Dumazet }, 1646cb32f511SEric Dumazet }; 1647cb32f511SEric Dumazet 1648808a8f88SVlad Yasevich static int __init ipv4_offload_init(void) 1649808a8f88SVlad Yasevich { 1650808a8f88SVlad Yasevich /* 1651808a8f88SVlad Yasevich * Add offloads 1652808a8f88SVlad Yasevich */ 1653da5bab07SDaniel Borkmann if (udpv4_offload_init() < 0) 1654808a8f88SVlad Yasevich pr_crit("%s: Cannot add UDP protocol offload\n", __func__); 165528850dc7SDaniel Borkmann if (tcpv4_offload_init() < 0) 165628850dc7SDaniel Borkmann pr_crit("%s: Cannot add TCP protocol offload\n", __func__); 1657808a8f88SVlad Yasevich 1658808a8f88SVlad Yasevich dev_add_offload(&ip_packet_offload); 1659cb32f511SEric Dumazet inet_add_offload(&ipip_offload, IPPROTO_IPIP); 1660808a8f88SVlad Yasevich return 0; 1661808a8f88SVlad Yasevich } 1662808a8f88SVlad Yasevich 1663808a8f88SVlad Yasevich fs_initcall(ipv4_offload_init); 1664808a8f88SVlad Yasevich 1665808a8f88SVlad Yasevich static struct packet_type ip_packet_type __read_mostly = { 1666808a8f88SVlad Yasevich .type = cpu_to_be16(ETH_P_IP), 1667808a8f88SVlad Yasevich .func = ip_rcv, 1668808a8f88SVlad Yasevich }; 1669808a8f88SVlad Yasevich 16701da177e4SLinus Torvalds static int __init inet_init(void) 16711da177e4SLinus Torvalds { 16721da177e4SLinus Torvalds struct inet_protosw *q; 16731da177e4SLinus Torvalds struct list_head *r; 16741da177e4SLinus Torvalds int rc = -EINVAL; 16751da177e4SLinus Torvalds 1676b4772ef8SEyal Birger sock_skb_cb_check_size(sizeof(struct inet_skb_parm)); 16771da177e4SLinus Torvalds 16781da177e4SLinus Torvalds rc = proto_register(&tcp_prot, 1); 16791da177e4SLinus Torvalds if (rc) 1680122ff243SWANG Cong goto out; 16811da177e4SLinus Torvalds 16821da177e4SLinus Torvalds rc = proto_register(&udp_prot, 1); 16831da177e4SLinus Torvalds if (rc) 16841da177e4SLinus Torvalds goto out_unregister_tcp_proto; 16851da177e4SLinus Torvalds 16861da177e4SLinus Torvalds rc = proto_register(&raw_prot, 1); 16871da177e4SLinus Torvalds if (rc) 16881da177e4SLinus Torvalds goto out_unregister_udp_proto; 16891da177e4SLinus Torvalds 1690c319b4d7SVasiliy Kulikov rc = proto_register(&ping_prot, 1); 1691c319b4d7SVasiliy Kulikov if (rc) 1692c319b4d7SVasiliy Kulikov goto out_unregister_raw_proto; 1693c319b4d7SVasiliy Kulikov 16941da177e4SLinus Torvalds /* 16951da177e4SLinus Torvalds * Tell SOCKET that we are alive... 16961da177e4SLinus Torvalds */ 16971da177e4SLinus Torvalds 16981da177e4SLinus Torvalds (void)sock_register(&inet_family_ops); 16991da177e4SLinus Torvalds 1700bd7b1533SAl Viro #ifdef CONFIG_SYSCTL 1701bd7b1533SAl Viro ip_static_sysctl_init(); 1702bd7b1533SAl Viro #endif 1703bd7b1533SAl Viro 17041da177e4SLinus Torvalds /* 17051da177e4SLinus Torvalds * Add all the base protocols. 17061da177e4SLinus Torvalds */ 17071da177e4SLinus Torvalds 17081da177e4SLinus Torvalds if (inet_add_protocol(&icmp_protocol, IPPROTO_ICMP) < 0) 1709058bd4d2SJoe Perches pr_crit("%s: Cannot add ICMP protocol\n", __func__); 17101da177e4SLinus Torvalds if (inet_add_protocol(&udp_protocol, IPPROTO_UDP) < 0) 1711058bd4d2SJoe Perches pr_crit("%s: Cannot add UDP protocol\n", __func__); 17121da177e4SLinus Torvalds if (inet_add_protocol(&tcp_protocol, IPPROTO_TCP) < 0) 1713058bd4d2SJoe Perches pr_crit("%s: Cannot add TCP protocol\n", __func__); 17141da177e4SLinus Torvalds #ifdef CONFIG_IP_MULTICAST 17151da177e4SLinus Torvalds if (inet_add_protocol(&igmp_protocol, IPPROTO_IGMP) < 0) 1716058bd4d2SJoe Perches pr_crit("%s: Cannot add IGMP protocol\n", __func__); 17171da177e4SLinus Torvalds #endif 17181da177e4SLinus Torvalds 17191da177e4SLinus Torvalds /* Register the socket-side information for inet_create. */ 17201da177e4SLinus Torvalds for (r = &inetsw[0]; r < &inetsw[SOCK_MAX]; ++r) 17211da177e4SLinus Torvalds INIT_LIST_HEAD(r); 17221da177e4SLinus Torvalds 17231da177e4SLinus Torvalds for (q = inetsw_array; q < &inetsw_array[INETSW_ARRAY_LEN]; ++q) 17241da177e4SLinus Torvalds inet_register_protosw(q); 17251da177e4SLinus Torvalds 17261da177e4SLinus Torvalds /* 17271da177e4SLinus Torvalds * Set the ARP module up 17281da177e4SLinus Torvalds */ 17291da177e4SLinus Torvalds 17301da177e4SLinus Torvalds arp_init(); 17311da177e4SLinus Torvalds 17321da177e4SLinus Torvalds /* 17331da177e4SLinus Torvalds * Set the IP module up 17341da177e4SLinus Torvalds */ 17351da177e4SLinus Torvalds 17361da177e4SLinus Torvalds ip_init(); 17371da177e4SLinus Torvalds 17389b0f976fSDenis V. Lunev tcp_v4_init(); 17391da177e4SLinus Torvalds 17401da177e4SLinus Torvalds /* Setup TCP slab cache for open requests. */ 17411da177e4SLinus Torvalds tcp_init(); 17421da177e4SLinus Torvalds 174395766fffSHideo Aoki /* Setup UDP memory threshold */ 174495766fffSHideo Aoki udp_init(); 174595766fffSHideo Aoki 1746ba4e58ecSGerrit Renker /* Add UDP-Lite (RFC 3828) */ 1747ba4e58ecSGerrit Renker udplite4_register(); 17481da177e4SLinus Torvalds 1749c319b4d7SVasiliy Kulikov ping_init(); 1750c319b4d7SVasiliy Kulikov 17511da177e4SLinus Torvalds /* 17521da177e4SLinus Torvalds * Set the ICMP layer up 17531da177e4SLinus Torvalds */ 17541da177e4SLinus Torvalds 1755a5710d65SDenis V. Lunev if (icmp_init() < 0) 1756a5710d65SDenis V. Lunev panic("Failed to create the ICMP control socket.\n"); 17571da177e4SLinus Torvalds 17581da177e4SLinus Torvalds /* 17591da177e4SLinus Torvalds * Initialise the multicast router 17601da177e4SLinus Torvalds */ 17611da177e4SLinus Torvalds #if defined(CONFIG_IP_MROUTE) 176203d2f897SWang Chen if (ip_mr_init()) 1763058bd4d2SJoe Perches pr_crit("%s: Cannot init ipv4 mroute\n", __func__); 17641da177e4SLinus Torvalds #endif 1765c9d8f1a6SCong Wang 1766c9d8f1a6SCong Wang if (init_inet_pernet_ops()) 1767c9d8f1a6SCong Wang pr_crit("%s: Cannot init ipv4 inet pernet ops\n", __func__); 17681da177e4SLinus Torvalds /* 17691da177e4SLinus Torvalds * Initialise per-cpu ipv4 mibs 17701da177e4SLinus Torvalds */ 17711da177e4SLinus Torvalds 17721da177e4SLinus Torvalds if (init_ipv4_mibs()) 1773058bd4d2SJoe Perches pr_crit("%s: Cannot init ipv4 mibs\n", __func__); 17741da177e4SLinus Torvalds 17751da177e4SLinus Torvalds ipv4_proc_init(); 17761da177e4SLinus Torvalds 17771da177e4SLinus Torvalds ipfrag_init(); 17781da177e4SLinus Torvalds 177930e224d7SHerbert Xu dev_add_pack(&ip_packet_type); 178030e224d7SHerbert Xu 17811da177e4SLinus Torvalds rc = 0; 17821da177e4SLinus Torvalds out: 17831da177e4SLinus Torvalds return rc; 1784c319b4d7SVasiliy Kulikov out_unregister_raw_proto: 1785c319b4d7SVasiliy Kulikov proto_unregister(&raw_prot); 17861da177e4SLinus Torvalds out_unregister_udp_proto: 17871da177e4SLinus Torvalds proto_unregister(&udp_prot); 1788321efff7SOlaf Kirch out_unregister_tcp_proto: 1789321efff7SOlaf Kirch proto_unregister(&tcp_prot); 17901da177e4SLinus Torvalds goto out; 17911da177e4SLinus Torvalds } 17921da177e4SLinus Torvalds 1793a536e077SHeiko Carstens fs_initcall(inet_init); 17941da177e4SLinus Torvalds 17951da177e4SLinus Torvalds /* ------------------------------------------------------------------------ */ 17961da177e4SLinus Torvalds 17971da177e4SLinus Torvalds #ifdef CONFIG_PROC_FS 17981da177e4SLinus Torvalds static int __init ipv4_proc_init(void) 17991da177e4SLinus Torvalds { 18001da177e4SLinus Torvalds int rc = 0; 18011da177e4SLinus Torvalds 18021da177e4SLinus Torvalds if (raw_proc_init()) 18031da177e4SLinus Torvalds goto out_raw; 18041da177e4SLinus Torvalds if (tcp4_proc_init()) 18051da177e4SLinus Torvalds goto out_tcp; 18061da177e4SLinus Torvalds if (udp4_proc_init()) 18071da177e4SLinus Torvalds goto out_udp; 1808c319b4d7SVasiliy Kulikov if (ping_proc_init()) 1809c319b4d7SVasiliy Kulikov goto out_ping; 18101da177e4SLinus Torvalds if (ip_misc_proc_init()) 18111da177e4SLinus Torvalds goto out_misc; 18121da177e4SLinus Torvalds out: 18131da177e4SLinus Torvalds return rc; 18141da177e4SLinus Torvalds out_misc: 1815c319b4d7SVasiliy Kulikov ping_proc_exit(); 1816c319b4d7SVasiliy Kulikov out_ping: 18171da177e4SLinus Torvalds udp4_proc_exit(); 18181da177e4SLinus Torvalds out_udp: 18191da177e4SLinus Torvalds tcp4_proc_exit(); 18201da177e4SLinus Torvalds out_tcp: 18211da177e4SLinus Torvalds raw_proc_exit(); 18221da177e4SLinus Torvalds out_raw: 18231da177e4SLinus Torvalds rc = -ENOMEM; 18241da177e4SLinus Torvalds goto out; 18251da177e4SLinus Torvalds } 18261da177e4SLinus Torvalds 18271da177e4SLinus Torvalds #else /* CONFIG_PROC_FS */ 18281da177e4SLinus Torvalds static int __init ipv4_proc_init(void) 18291da177e4SLinus Torvalds { 18301da177e4SLinus Torvalds return 0; 18311da177e4SLinus Torvalds } 18321da177e4SLinus Torvalds #endif /* CONFIG_PROC_FS */ 18331da177e4SLinus Torvalds 18341da177e4SLinus Torvalds MODULE_ALIAS_NETPROTO(PF_INET); 18351da177e4SLinus Torvalds 1836