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 * 81da177e4SLinus Torvalds * Version: $Id: af_inet.c,v 1.137 2002/02/01 22:01:03 davem Exp $ 91da177e4SLinus Torvalds * 1002c30a84SJesper Juhl * Authors: Ross Biro 111da177e4SLinus Torvalds * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG> 121da177e4SLinus Torvalds * Florian La Roche, <flla@stud.uni-sb.de> 131da177e4SLinus Torvalds * Alan Cox, <A.Cox@swansea.ac.uk> 141da177e4SLinus Torvalds * 151da177e4SLinus Torvalds * Changes (see also sock.c) 161da177e4SLinus Torvalds * 171da177e4SLinus Torvalds * piggy, 181da177e4SLinus Torvalds * Karl Knutson : Socket protocol table 191da177e4SLinus Torvalds * A.N.Kuznetsov : Socket death error in accept(). 201da177e4SLinus Torvalds * John Richardson : Fix non blocking error in connect() 211da177e4SLinus Torvalds * so sockets that fail to connect 221da177e4SLinus Torvalds * don't return -EINPROGRESS. 231da177e4SLinus Torvalds * Alan Cox : Asynchronous I/O support 241da177e4SLinus Torvalds * Alan Cox : Keep correct socket pointer on sock 251da177e4SLinus Torvalds * structures 261da177e4SLinus Torvalds * when accept() ed 271da177e4SLinus Torvalds * Alan Cox : Semantics of SO_LINGER aren't state 281da177e4SLinus Torvalds * moved to close when you look carefully. 291da177e4SLinus Torvalds * With this fixed and the accept bug fixed 301da177e4SLinus Torvalds * some RPC stuff seems happier. 311da177e4SLinus Torvalds * Niibe Yutaka : 4.4BSD style write async I/O 321da177e4SLinus Torvalds * Alan Cox, 331da177e4SLinus Torvalds * Tony Gale : Fixed reuse semantics. 341da177e4SLinus Torvalds * Alan Cox : bind() shouldn't abort existing but dead 351da177e4SLinus Torvalds * sockets. Stops FTP netin:.. I hope. 361da177e4SLinus Torvalds * Alan Cox : bind() works correctly for RAW sockets. 371da177e4SLinus Torvalds * Note that FreeBSD at least was broken 381da177e4SLinus Torvalds * in this respect so be careful with 391da177e4SLinus Torvalds * compatibility tests... 401da177e4SLinus Torvalds * Alan Cox : routing cache support 411da177e4SLinus Torvalds * Alan Cox : memzero the socket structure for 421da177e4SLinus Torvalds * compactness. 431da177e4SLinus Torvalds * Matt Day : nonblock connect error handler 441da177e4SLinus Torvalds * Alan Cox : Allow large numbers of pending sockets 451da177e4SLinus Torvalds * (eg for big web sites), but only if 461da177e4SLinus Torvalds * specifically application requested. 471da177e4SLinus Torvalds * Alan Cox : New buffering throughout IP. Used 481da177e4SLinus Torvalds * dumbly. 491da177e4SLinus Torvalds * Alan Cox : New buffering now used smartly. 501da177e4SLinus Torvalds * Alan Cox : BSD rather than common sense 511da177e4SLinus Torvalds * interpretation of listen. 521da177e4SLinus Torvalds * Germano Caronni : Assorted small races. 531da177e4SLinus Torvalds * Alan Cox : sendmsg/recvmsg basic support. 541da177e4SLinus Torvalds * Alan Cox : Only sendmsg/recvmsg now supported. 551da177e4SLinus Torvalds * Alan Cox : Locked down bind (see security list). 561da177e4SLinus Torvalds * Alan Cox : Loosened bind a little. 571da177e4SLinus Torvalds * Mike McLagan : ADD/DEL DLCI Ioctls 581da177e4SLinus Torvalds * Willy Konynenberg : Transparent proxying support. 591da177e4SLinus Torvalds * David S. Miller : New socket lookup architecture. 601da177e4SLinus Torvalds * Some other random speedups. 611da177e4SLinus Torvalds * Cyrus Durgin : Cleaned up file for kmod hacks. 621da177e4SLinus Torvalds * Andi Kleen : Fix inet_stream_connect TCP race. 631da177e4SLinus Torvalds * 641da177e4SLinus Torvalds * This program is free software; you can redistribute it and/or 651da177e4SLinus Torvalds * modify it under the terms of the GNU General Public License 661da177e4SLinus Torvalds * as published by the Free Software Foundation; either version 671da177e4SLinus Torvalds * 2 of the License, or (at your option) any later version. 681da177e4SLinus Torvalds */ 691da177e4SLinus Torvalds 701da177e4SLinus Torvalds #include <linux/config.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> 901da177e4SLinus Torvalds 911da177e4SLinus Torvalds #include <asm/uaccess.h> 921da177e4SLinus Torvalds #include <asm/system.h> 931da177e4SLinus Torvalds 941da177e4SLinus Torvalds #include <linux/smp_lock.h> 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> 991da177e4SLinus Torvalds #include <net/ip.h> 1001da177e4SLinus Torvalds #include <net/protocol.h> 1011da177e4SLinus Torvalds #include <net/arp.h> 1021da177e4SLinus Torvalds #include <net/route.h> 1031da177e4SLinus Torvalds #include <net/ip_fib.h> 104295f7324SArnaldo Carvalho de Melo #include <net/inet_connection_sock.h> 1051da177e4SLinus Torvalds #include <net/tcp.h> 1061da177e4SLinus Torvalds #include <net/udp.h> 1071da177e4SLinus Torvalds #include <linux/skbuff.h> 1081da177e4SLinus Torvalds #include <net/sock.h> 1091da177e4SLinus Torvalds #include <net/raw.h> 1101da177e4SLinus Torvalds #include <net/icmp.h> 1111da177e4SLinus Torvalds #include <net/ipip.h> 1121da177e4SLinus Torvalds #include <net/inet_common.h> 1131da177e4SLinus Torvalds #include <net/xfrm.h> 1141da177e4SLinus Torvalds #ifdef CONFIG_IP_MROUTE 1151da177e4SLinus Torvalds #include <linux/mroute.h> 1161da177e4SLinus Torvalds #endif 1171da177e4SLinus Torvalds 118ba89966cSEric Dumazet DEFINE_SNMP_STAT(struct linux_mib, net_statistics) __read_mostly; 1191da177e4SLinus Torvalds 1201da177e4SLinus Torvalds extern void ip_mc_drop_socket(struct sock *sk); 1211da177e4SLinus Torvalds 1221da177e4SLinus Torvalds /* The inetsw table contains everything that inet_create needs to 1231da177e4SLinus Torvalds * build a new socket. 1241da177e4SLinus Torvalds */ 1251da177e4SLinus Torvalds static struct list_head inetsw[SOCK_MAX]; 1261da177e4SLinus Torvalds static DEFINE_SPINLOCK(inetsw_lock); 1271da177e4SLinus Torvalds 1281da177e4SLinus Torvalds /* New destruction routine */ 1291da177e4SLinus Torvalds 1301da177e4SLinus Torvalds void inet_sock_destruct(struct sock *sk) 1311da177e4SLinus Torvalds { 1321da177e4SLinus Torvalds struct inet_sock *inet = inet_sk(sk); 1331da177e4SLinus Torvalds 1341da177e4SLinus Torvalds __skb_queue_purge(&sk->sk_receive_queue); 1351da177e4SLinus Torvalds __skb_queue_purge(&sk->sk_error_queue); 1361da177e4SLinus Torvalds 1371da177e4SLinus Torvalds if (sk->sk_type == SOCK_STREAM && sk->sk_state != TCP_CLOSE) { 1381da177e4SLinus Torvalds printk("Attempt to release TCP socket in state %d %p\n", 1391da177e4SLinus Torvalds sk->sk_state, sk); 1401da177e4SLinus Torvalds return; 1411da177e4SLinus Torvalds } 1421da177e4SLinus Torvalds if (!sock_flag(sk, SOCK_DEAD)) { 1431da177e4SLinus Torvalds printk("Attempt to release alive inet socket %p\n", sk); 1441da177e4SLinus Torvalds return; 1451da177e4SLinus Torvalds } 1461da177e4SLinus Torvalds 1471da177e4SLinus Torvalds BUG_TRAP(!atomic_read(&sk->sk_rmem_alloc)); 1481da177e4SLinus Torvalds BUG_TRAP(!atomic_read(&sk->sk_wmem_alloc)); 1491da177e4SLinus Torvalds BUG_TRAP(!sk->sk_wmem_queued); 1501da177e4SLinus Torvalds BUG_TRAP(!sk->sk_forward_alloc); 1511da177e4SLinus Torvalds 1521da177e4SLinus Torvalds kfree(inet->opt); 1531da177e4SLinus Torvalds dst_release(sk->sk_dst_cache); 154e6848976SArnaldo Carvalho de Melo sk_refcnt_debug_dec(sk); 1551da177e4SLinus Torvalds } 1561da177e4SLinus Torvalds 1571da177e4SLinus Torvalds /* 1581da177e4SLinus Torvalds * The routines beyond this point handle the behaviour of an AF_INET 1591da177e4SLinus Torvalds * socket object. Mostly it punts to the subprotocols of IP to do 1601da177e4SLinus Torvalds * the work. 1611da177e4SLinus Torvalds */ 1621da177e4SLinus Torvalds 1631da177e4SLinus Torvalds /* 1641da177e4SLinus Torvalds * Automatically bind an unbound socket. 1651da177e4SLinus Torvalds */ 1661da177e4SLinus Torvalds 1671da177e4SLinus Torvalds static int inet_autobind(struct sock *sk) 1681da177e4SLinus Torvalds { 1691da177e4SLinus Torvalds struct inet_sock *inet; 1701da177e4SLinus Torvalds /* We may need to bind the socket. */ 1711da177e4SLinus Torvalds lock_sock(sk); 1721da177e4SLinus Torvalds inet = inet_sk(sk); 1731da177e4SLinus Torvalds if (!inet->num) { 1741da177e4SLinus Torvalds if (sk->sk_prot->get_port(sk, 0)) { 1751da177e4SLinus Torvalds release_sock(sk); 1761da177e4SLinus Torvalds return -EAGAIN; 1771da177e4SLinus Torvalds } 1781da177e4SLinus Torvalds inet->sport = htons(inet->num); 1791da177e4SLinus Torvalds } 1801da177e4SLinus Torvalds release_sock(sk); 1811da177e4SLinus Torvalds return 0; 1821da177e4SLinus Torvalds } 1831da177e4SLinus Torvalds 1841da177e4SLinus Torvalds /* 1851da177e4SLinus Torvalds * Move a socket into listening state. 1861da177e4SLinus Torvalds */ 1871da177e4SLinus Torvalds int inet_listen(struct socket *sock, int backlog) 1881da177e4SLinus Torvalds { 1891da177e4SLinus Torvalds struct sock *sk = sock->sk; 1901da177e4SLinus Torvalds unsigned char old_state; 1911da177e4SLinus Torvalds int err; 1921da177e4SLinus Torvalds 1931da177e4SLinus Torvalds lock_sock(sk); 1941da177e4SLinus Torvalds 1951da177e4SLinus Torvalds err = -EINVAL; 1961da177e4SLinus Torvalds if (sock->state != SS_UNCONNECTED || sock->type != SOCK_STREAM) 1971da177e4SLinus Torvalds goto out; 1981da177e4SLinus Torvalds 1991da177e4SLinus Torvalds old_state = sk->sk_state; 2001da177e4SLinus Torvalds if (!((1 << old_state) & (TCPF_CLOSE | TCPF_LISTEN))) 2011da177e4SLinus Torvalds goto out; 2021da177e4SLinus Torvalds 2031da177e4SLinus Torvalds /* Really, if the socket is already in listen state 2041da177e4SLinus Torvalds * we can only allow the backlog to be adjusted. 2051da177e4SLinus Torvalds */ 2061da177e4SLinus Torvalds if (old_state != TCP_LISTEN) { 2070a5578cfSArnaldo Carvalho de Melo err = inet_csk_listen_start(sk, TCP_SYNQ_HSIZE); 2081da177e4SLinus Torvalds if (err) 2091da177e4SLinus Torvalds goto out; 2101da177e4SLinus Torvalds } 2111da177e4SLinus Torvalds sk->sk_max_ack_backlog = backlog; 2121da177e4SLinus Torvalds err = 0; 2131da177e4SLinus Torvalds 2141da177e4SLinus Torvalds out: 2151da177e4SLinus Torvalds release_sock(sk); 2161da177e4SLinus Torvalds return err; 2171da177e4SLinus Torvalds } 2181da177e4SLinus Torvalds 2191da177e4SLinus Torvalds /* 2201da177e4SLinus Torvalds * Create an inet socket. 2211da177e4SLinus Torvalds */ 2221da177e4SLinus Torvalds 2231da177e4SLinus Torvalds static int inet_create(struct socket *sock, int protocol) 2241da177e4SLinus Torvalds { 2251da177e4SLinus Torvalds struct sock *sk; 2261da177e4SLinus Torvalds struct list_head *p; 2271da177e4SLinus Torvalds struct inet_protosw *answer; 2281da177e4SLinus Torvalds struct inet_sock *inet; 2291da177e4SLinus Torvalds struct proto *answer_prot; 2301da177e4SLinus Torvalds unsigned char answer_flags; 2311da177e4SLinus Torvalds char answer_no_check; 232bb97d31fSArnaldo Carvalho de Melo int try_loading_module = 0; 23386c8f9d1SHerbert Xu int err; 2341da177e4SLinus Torvalds 2351da177e4SLinus Torvalds sock->state = SS_UNCONNECTED; 2361da177e4SLinus Torvalds 2371da177e4SLinus Torvalds /* Look for the requested type/protocol pair. */ 2381da177e4SLinus Torvalds answer = NULL; 239bb97d31fSArnaldo Carvalho de Melo lookup_protocol: 24086c8f9d1SHerbert Xu err = -ESOCKTNOSUPPORT; 2411da177e4SLinus Torvalds rcu_read_lock(); 2421da177e4SLinus Torvalds list_for_each_rcu(p, &inetsw[sock->type]) { 2431da177e4SLinus Torvalds answer = list_entry(p, struct inet_protosw, list); 2441da177e4SLinus Torvalds 2451da177e4SLinus Torvalds /* Check the non-wild match. */ 2461da177e4SLinus Torvalds if (protocol == answer->protocol) { 2471da177e4SLinus Torvalds if (protocol != IPPROTO_IP) 2481da177e4SLinus Torvalds break; 2491da177e4SLinus Torvalds } else { 2501da177e4SLinus Torvalds /* Check for the two wild cases. */ 2511da177e4SLinus Torvalds if (IPPROTO_IP == protocol) { 2521da177e4SLinus Torvalds protocol = answer->protocol; 2531da177e4SLinus Torvalds break; 2541da177e4SLinus Torvalds } 2551da177e4SLinus Torvalds if (IPPROTO_IP == answer->protocol) 2561da177e4SLinus Torvalds break; 2571da177e4SLinus Torvalds } 25886c8f9d1SHerbert Xu err = -EPROTONOSUPPORT; 2591da177e4SLinus Torvalds answer = NULL; 2601da177e4SLinus Torvalds } 2611da177e4SLinus Torvalds 262bb97d31fSArnaldo Carvalho de Melo if (unlikely(answer == NULL)) { 263bb97d31fSArnaldo Carvalho de Melo if (try_loading_module < 2) { 264bb97d31fSArnaldo Carvalho de Melo rcu_read_unlock(); 265bb97d31fSArnaldo Carvalho de Melo /* 266bb97d31fSArnaldo Carvalho de Melo * Be more specific, e.g. net-pf-2-proto-132-type-1 267bb97d31fSArnaldo Carvalho de Melo * (net-pf-PF_INET-proto-IPPROTO_SCTP-type-SOCK_STREAM) 268bb97d31fSArnaldo Carvalho de Melo */ 269bb97d31fSArnaldo Carvalho de Melo if (++try_loading_module == 1) 270bb97d31fSArnaldo Carvalho de Melo request_module("net-pf-%d-proto-%d-type-%d", 271bb97d31fSArnaldo Carvalho de Melo PF_INET, protocol, sock->type); 272bb97d31fSArnaldo Carvalho de Melo /* 273bb97d31fSArnaldo Carvalho de Melo * Fall back to generic, e.g. net-pf-2-proto-132 274bb97d31fSArnaldo Carvalho de Melo * (net-pf-PF_INET-proto-IPPROTO_SCTP) 275bb97d31fSArnaldo Carvalho de Melo */ 276bb97d31fSArnaldo Carvalho de Melo else 277bb97d31fSArnaldo Carvalho de Melo request_module("net-pf-%d-proto-%d", 278bb97d31fSArnaldo Carvalho de Melo PF_INET, protocol); 279bb97d31fSArnaldo Carvalho de Melo goto lookup_protocol; 280bb97d31fSArnaldo Carvalho de Melo } else 2811da177e4SLinus Torvalds goto out_rcu_unlock; 282bb97d31fSArnaldo Carvalho de Melo } 283bb97d31fSArnaldo Carvalho de Melo 2841da177e4SLinus Torvalds err = -EPERM; 2851da177e4SLinus Torvalds if (answer->capability > 0 && !capable(answer->capability)) 2861da177e4SLinus Torvalds goto out_rcu_unlock; 2871da177e4SLinus Torvalds 2881da177e4SLinus Torvalds sock->ops = answer->ops; 2891da177e4SLinus Torvalds answer_prot = answer->prot; 2901da177e4SLinus Torvalds answer_no_check = answer->no_check; 2911da177e4SLinus Torvalds answer_flags = answer->flags; 2921da177e4SLinus Torvalds rcu_read_unlock(); 2931da177e4SLinus Torvalds 2941da177e4SLinus Torvalds BUG_TRAP(answer_prot->slab != NULL); 2951da177e4SLinus Torvalds 2961da177e4SLinus Torvalds err = -ENOBUFS; 2971da177e4SLinus Torvalds sk = sk_alloc(PF_INET, GFP_KERNEL, answer_prot, 1); 2981da177e4SLinus Torvalds if (sk == NULL) 2991da177e4SLinus Torvalds goto out; 3001da177e4SLinus Torvalds 3011da177e4SLinus Torvalds err = 0; 3021da177e4SLinus Torvalds sk->sk_no_check = answer_no_check; 3031da177e4SLinus Torvalds if (INET_PROTOSW_REUSE & answer_flags) 3041da177e4SLinus Torvalds sk->sk_reuse = 1; 3051da177e4SLinus Torvalds 3061da177e4SLinus Torvalds inet = inet_sk(sk); 307d83d8461SArnaldo Carvalho de Melo inet->is_icsk = INET_PROTOSW_ICSK & answer_flags; 3081da177e4SLinus Torvalds 3091da177e4SLinus Torvalds if (SOCK_RAW == sock->type) { 3101da177e4SLinus Torvalds inet->num = protocol; 3111da177e4SLinus Torvalds if (IPPROTO_RAW == protocol) 3121da177e4SLinus Torvalds inet->hdrincl = 1; 3131da177e4SLinus Torvalds } 3141da177e4SLinus Torvalds 3151da177e4SLinus Torvalds if (ipv4_config.no_pmtu_disc) 3161da177e4SLinus Torvalds inet->pmtudisc = IP_PMTUDISC_DONT; 3171da177e4SLinus Torvalds else 3181da177e4SLinus Torvalds inet->pmtudisc = IP_PMTUDISC_WANT; 3191da177e4SLinus Torvalds 3201da177e4SLinus Torvalds inet->id = 0; 3211da177e4SLinus Torvalds 3221da177e4SLinus Torvalds sock_init_data(sock, sk); 3231da177e4SLinus Torvalds 3241da177e4SLinus Torvalds sk->sk_destruct = inet_sock_destruct; 3251da177e4SLinus Torvalds sk->sk_family = PF_INET; 3261da177e4SLinus Torvalds sk->sk_protocol = protocol; 3271da177e4SLinus Torvalds sk->sk_backlog_rcv = sk->sk_prot->backlog_rcv; 3281da177e4SLinus Torvalds 3291da177e4SLinus Torvalds inet->uc_ttl = -1; 3301da177e4SLinus Torvalds inet->mc_loop = 1; 3311da177e4SLinus Torvalds inet->mc_ttl = 1; 3321da177e4SLinus Torvalds inet->mc_index = 0; 3331da177e4SLinus Torvalds inet->mc_list = NULL; 3341da177e4SLinus Torvalds 335e6848976SArnaldo Carvalho de Melo sk_refcnt_debug_inc(sk); 3361da177e4SLinus Torvalds 3371da177e4SLinus Torvalds if (inet->num) { 3381da177e4SLinus Torvalds /* It assumes that any protocol which allows 3391da177e4SLinus Torvalds * the user to assign a number at socket 3401da177e4SLinus Torvalds * creation time automatically 3411da177e4SLinus Torvalds * shares. 3421da177e4SLinus Torvalds */ 3431da177e4SLinus Torvalds inet->sport = htons(inet->num); 3441da177e4SLinus Torvalds /* Add to protocol hash chains. */ 3451da177e4SLinus Torvalds sk->sk_prot->hash(sk); 3461da177e4SLinus Torvalds } 3471da177e4SLinus Torvalds 3481da177e4SLinus Torvalds if (sk->sk_prot->init) { 3491da177e4SLinus Torvalds err = sk->sk_prot->init(sk); 3501da177e4SLinus Torvalds if (err) 3511da177e4SLinus Torvalds sk_common_release(sk); 3521da177e4SLinus Torvalds } 3531da177e4SLinus Torvalds out: 3541da177e4SLinus Torvalds return err; 3551da177e4SLinus Torvalds out_rcu_unlock: 3561da177e4SLinus Torvalds rcu_read_unlock(); 3571da177e4SLinus Torvalds goto out; 3581da177e4SLinus Torvalds } 3591da177e4SLinus Torvalds 3601da177e4SLinus Torvalds 3611da177e4SLinus Torvalds /* 3621da177e4SLinus Torvalds * The peer socket should always be NULL (or else). When we call this 3631da177e4SLinus Torvalds * function we are destroying the object and from then on nobody 3641da177e4SLinus Torvalds * should refer to it. 3651da177e4SLinus Torvalds */ 3661da177e4SLinus Torvalds int inet_release(struct socket *sock) 3671da177e4SLinus Torvalds { 3681da177e4SLinus Torvalds struct sock *sk = sock->sk; 3691da177e4SLinus Torvalds 3701da177e4SLinus Torvalds if (sk) { 3711da177e4SLinus Torvalds long timeout; 3721da177e4SLinus Torvalds 3731da177e4SLinus Torvalds /* Applications forget to leave groups before exiting */ 3741da177e4SLinus Torvalds ip_mc_drop_socket(sk); 3751da177e4SLinus Torvalds 3761da177e4SLinus Torvalds /* If linger is set, we don't return until the close 3771da177e4SLinus Torvalds * is complete. Otherwise we return immediately. The 3781da177e4SLinus Torvalds * actually closing is done the same either way. 3791da177e4SLinus Torvalds * 3801da177e4SLinus Torvalds * If the close is due to the process exiting, we never 3811da177e4SLinus Torvalds * linger.. 3821da177e4SLinus Torvalds */ 3831da177e4SLinus Torvalds timeout = 0; 3841da177e4SLinus Torvalds if (sock_flag(sk, SOCK_LINGER) && 3851da177e4SLinus Torvalds !(current->flags & PF_EXITING)) 3861da177e4SLinus Torvalds timeout = sk->sk_lingertime; 3871da177e4SLinus Torvalds sock->sk = NULL; 3881da177e4SLinus Torvalds sk->sk_prot->close(sk, timeout); 3891da177e4SLinus Torvalds } 3901da177e4SLinus Torvalds return 0; 3911da177e4SLinus Torvalds } 3921da177e4SLinus Torvalds 3931da177e4SLinus Torvalds /* It is off by default, see below. */ 3941da177e4SLinus Torvalds int sysctl_ip_nonlocal_bind; 3951da177e4SLinus Torvalds 3961da177e4SLinus Torvalds int inet_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len) 3971da177e4SLinus Torvalds { 3981da177e4SLinus Torvalds struct sockaddr_in *addr = (struct sockaddr_in *)uaddr; 3991da177e4SLinus Torvalds struct sock *sk = sock->sk; 4001da177e4SLinus Torvalds struct inet_sock *inet = inet_sk(sk); 4011da177e4SLinus Torvalds unsigned short snum; 4021da177e4SLinus Torvalds int chk_addr_ret; 4031da177e4SLinus Torvalds int err; 4041da177e4SLinus Torvalds 4051da177e4SLinus Torvalds /* If the socket has its own bind function then use it. (RAW) */ 4061da177e4SLinus Torvalds if (sk->sk_prot->bind) { 4071da177e4SLinus Torvalds err = sk->sk_prot->bind(sk, uaddr, addr_len); 4081da177e4SLinus Torvalds goto out; 4091da177e4SLinus Torvalds } 4101da177e4SLinus Torvalds err = -EINVAL; 4111da177e4SLinus Torvalds if (addr_len < sizeof(struct sockaddr_in)) 4121da177e4SLinus Torvalds goto out; 4131da177e4SLinus Torvalds 4141da177e4SLinus Torvalds chk_addr_ret = inet_addr_type(addr->sin_addr.s_addr); 4151da177e4SLinus Torvalds 4161da177e4SLinus Torvalds /* Not specified by any standard per-se, however it breaks too 4171da177e4SLinus Torvalds * many applications when removed. It is unfortunate since 4181da177e4SLinus Torvalds * allowing applications to make a non-local bind solves 4191da177e4SLinus Torvalds * several problems with systems using dynamic addressing. 4201da177e4SLinus Torvalds * (ie. your servers still start up even if your ISDN link 4211da177e4SLinus Torvalds * is temporarily down) 4221da177e4SLinus Torvalds */ 4231da177e4SLinus Torvalds err = -EADDRNOTAVAIL; 4241da177e4SLinus Torvalds if (!sysctl_ip_nonlocal_bind && 4251da177e4SLinus Torvalds !inet->freebind && 4261da177e4SLinus Torvalds addr->sin_addr.s_addr != INADDR_ANY && 4271da177e4SLinus Torvalds chk_addr_ret != RTN_LOCAL && 4281da177e4SLinus Torvalds chk_addr_ret != RTN_MULTICAST && 4291da177e4SLinus Torvalds chk_addr_ret != RTN_BROADCAST) 4301da177e4SLinus Torvalds goto out; 4311da177e4SLinus Torvalds 4321da177e4SLinus Torvalds snum = ntohs(addr->sin_port); 4331da177e4SLinus Torvalds err = -EACCES; 4341da177e4SLinus Torvalds if (snum && snum < PROT_SOCK && !capable(CAP_NET_BIND_SERVICE)) 4351da177e4SLinus Torvalds goto out; 4361da177e4SLinus Torvalds 4371da177e4SLinus Torvalds /* We keep a pair of addresses. rcv_saddr is the one 4381da177e4SLinus Torvalds * used by hash lookups, and saddr is used for transmit. 4391da177e4SLinus Torvalds * 4401da177e4SLinus Torvalds * In the BSD API these are the same except where it 4411da177e4SLinus Torvalds * would be illegal to use them (multicast/broadcast) in 4421da177e4SLinus Torvalds * which case the sending device address is used. 4431da177e4SLinus Torvalds */ 4441da177e4SLinus Torvalds lock_sock(sk); 4451da177e4SLinus Torvalds 4461da177e4SLinus Torvalds /* Check these errors (active socket, double bind). */ 4471da177e4SLinus Torvalds err = -EINVAL; 4481da177e4SLinus Torvalds if (sk->sk_state != TCP_CLOSE || inet->num) 4491da177e4SLinus Torvalds goto out_release_sock; 4501da177e4SLinus Torvalds 4511da177e4SLinus Torvalds inet->rcv_saddr = inet->saddr = addr->sin_addr.s_addr; 4521da177e4SLinus Torvalds if (chk_addr_ret == RTN_MULTICAST || chk_addr_ret == RTN_BROADCAST) 4531da177e4SLinus Torvalds inet->saddr = 0; /* Use device */ 4541da177e4SLinus Torvalds 4551da177e4SLinus Torvalds /* Make sure we are allowed to bind here. */ 4561da177e4SLinus Torvalds if (sk->sk_prot->get_port(sk, snum)) { 4571da177e4SLinus Torvalds inet->saddr = inet->rcv_saddr = 0; 4581da177e4SLinus Torvalds err = -EADDRINUSE; 4591da177e4SLinus Torvalds goto out_release_sock; 4601da177e4SLinus Torvalds } 4611da177e4SLinus Torvalds 4621da177e4SLinus Torvalds if (inet->rcv_saddr) 4631da177e4SLinus Torvalds sk->sk_userlocks |= SOCK_BINDADDR_LOCK; 4641da177e4SLinus Torvalds if (snum) 4651da177e4SLinus Torvalds sk->sk_userlocks |= SOCK_BINDPORT_LOCK; 4661da177e4SLinus Torvalds inet->sport = htons(inet->num); 4671da177e4SLinus Torvalds inet->daddr = 0; 4681da177e4SLinus Torvalds inet->dport = 0; 4691da177e4SLinus Torvalds sk_dst_reset(sk); 4701da177e4SLinus Torvalds err = 0; 4711da177e4SLinus Torvalds out_release_sock: 4721da177e4SLinus Torvalds release_sock(sk); 4731da177e4SLinus Torvalds out: 4741da177e4SLinus Torvalds return err; 4751da177e4SLinus Torvalds } 4761da177e4SLinus Torvalds 4771da177e4SLinus Torvalds int inet_dgram_connect(struct socket *sock, struct sockaddr * uaddr, 4781da177e4SLinus Torvalds int addr_len, int flags) 4791da177e4SLinus Torvalds { 4801da177e4SLinus Torvalds struct sock *sk = sock->sk; 4811da177e4SLinus Torvalds 4821da177e4SLinus Torvalds if (uaddr->sa_family == AF_UNSPEC) 4831da177e4SLinus Torvalds return sk->sk_prot->disconnect(sk, flags); 4841da177e4SLinus Torvalds 4851da177e4SLinus Torvalds if (!inet_sk(sk)->num && inet_autobind(sk)) 4861da177e4SLinus Torvalds return -EAGAIN; 4871da177e4SLinus Torvalds return sk->sk_prot->connect(sk, (struct sockaddr *)uaddr, addr_len); 4881da177e4SLinus Torvalds } 4891da177e4SLinus Torvalds 4901da177e4SLinus Torvalds static long inet_wait_for_connect(struct sock *sk, long timeo) 4911da177e4SLinus Torvalds { 4921da177e4SLinus Torvalds DEFINE_WAIT(wait); 4931da177e4SLinus Torvalds 4941da177e4SLinus Torvalds prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE); 4951da177e4SLinus Torvalds 4961da177e4SLinus Torvalds /* Basic assumption: if someone sets sk->sk_err, he _must_ 4971da177e4SLinus Torvalds * change state of the socket from TCP_SYN_*. 4981da177e4SLinus Torvalds * Connect() does not allow to get error notifications 4991da177e4SLinus Torvalds * without closing the socket. 5001da177e4SLinus Torvalds */ 5011da177e4SLinus Torvalds while ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV)) { 5021da177e4SLinus Torvalds release_sock(sk); 5031da177e4SLinus Torvalds timeo = schedule_timeout(timeo); 5041da177e4SLinus Torvalds lock_sock(sk); 5051da177e4SLinus Torvalds if (signal_pending(current) || !timeo) 5061da177e4SLinus Torvalds break; 5071da177e4SLinus Torvalds prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE); 5081da177e4SLinus Torvalds } 5091da177e4SLinus Torvalds finish_wait(sk->sk_sleep, &wait); 5101da177e4SLinus Torvalds return timeo; 5111da177e4SLinus Torvalds } 5121da177e4SLinus Torvalds 5131da177e4SLinus Torvalds /* 5141da177e4SLinus Torvalds * Connect to a remote host. There is regrettably still a little 5151da177e4SLinus Torvalds * TCP 'magic' in here. 5161da177e4SLinus Torvalds */ 5171da177e4SLinus Torvalds int inet_stream_connect(struct socket *sock, struct sockaddr *uaddr, 5181da177e4SLinus Torvalds int addr_len, int flags) 5191da177e4SLinus Torvalds { 5201da177e4SLinus Torvalds struct sock *sk = sock->sk; 5211da177e4SLinus Torvalds int err; 5221da177e4SLinus Torvalds long timeo; 5231da177e4SLinus Torvalds 5241da177e4SLinus Torvalds lock_sock(sk); 5251da177e4SLinus Torvalds 5261da177e4SLinus Torvalds if (uaddr->sa_family == AF_UNSPEC) { 5271da177e4SLinus Torvalds err = sk->sk_prot->disconnect(sk, flags); 5281da177e4SLinus Torvalds sock->state = err ? SS_DISCONNECTING : SS_UNCONNECTED; 5291da177e4SLinus Torvalds goto out; 5301da177e4SLinus Torvalds } 5311da177e4SLinus Torvalds 5321da177e4SLinus Torvalds switch (sock->state) { 5331da177e4SLinus Torvalds default: 5341da177e4SLinus Torvalds err = -EINVAL; 5351da177e4SLinus Torvalds goto out; 5361da177e4SLinus Torvalds case SS_CONNECTED: 5371da177e4SLinus Torvalds err = -EISCONN; 5381da177e4SLinus Torvalds goto out; 5391da177e4SLinus Torvalds case SS_CONNECTING: 5401da177e4SLinus Torvalds err = -EALREADY; 5411da177e4SLinus Torvalds /* Fall out of switch with err, set for this state */ 5421da177e4SLinus Torvalds break; 5431da177e4SLinus Torvalds case SS_UNCONNECTED: 5441da177e4SLinus Torvalds err = -EISCONN; 5451da177e4SLinus Torvalds if (sk->sk_state != TCP_CLOSE) 5461da177e4SLinus Torvalds goto out; 5471da177e4SLinus Torvalds 5481da177e4SLinus Torvalds err = sk->sk_prot->connect(sk, uaddr, addr_len); 5491da177e4SLinus Torvalds if (err < 0) 5501da177e4SLinus Torvalds goto out; 5511da177e4SLinus Torvalds 5521da177e4SLinus Torvalds sock->state = SS_CONNECTING; 5531da177e4SLinus Torvalds 5541da177e4SLinus Torvalds /* Just entered SS_CONNECTING state; the only 5551da177e4SLinus Torvalds * difference is that return value in non-blocking 5561da177e4SLinus Torvalds * case is EINPROGRESS, rather than EALREADY. 5571da177e4SLinus Torvalds */ 5581da177e4SLinus Torvalds err = -EINPROGRESS; 5591da177e4SLinus Torvalds break; 5601da177e4SLinus Torvalds } 5611da177e4SLinus Torvalds 5621da177e4SLinus Torvalds timeo = sock_sndtimeo(sk, flags & O_NONBLOCK); 5631da177e4SLinus Torvalds 5641da177e4SLinus Torvalds if ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV)) { 5651da177e4SLinus Torvalds /* Error code is set above */ 5661da177e4SLinus Torvalds if (!timeo || !inet_wait_for_connect(sk, timeo)) 5671da177e4SLinus Torvalds goto out; 5681da177e4SLinus Torvalds 5691da177e4SLinus Torvalds err = sock_intr_errno(timeo); 5701da177e4SLinus Torvalds if (signal_pending(current)) 5711da177e4SLinus Torvalds goto out; 5721da177e4SLinus Torvalds } 5731da177e4SLinus Torvalds 5741da177e4SLinus Torvalds /* Connection was closed by RST, timeout, ICMP error 5751da177e4SLinus Torvalds * or another process disconnected us. 5761da177e4SLinus Torvalds */ 5771da177e4SLinus Torvalds if (sk->sk_state == TCP_CLOSE) 5781da177e4SLinus Torvalds goto sock_error; 5791da177e4SLinus Torvalds 5801da177e4SLinus Torvalds /* sk->sk_err may be not zero now, if RECVERR was ordered by user 5811da177e4SLinus Torvalds * and error was received after socket entered established state. 5821da177e4SLinus Torvalds * Hence, it is handled normally after connect() return successfully. 5831da177e4SLinus Torvalds */ 5841da177e4SLinus Torvalds 5851da177e4SLinus Torvalds sock->state = SS_CONNECTED; 5861da177e4SLinus Torvalds err = 0; 5871da177e4SLinus Torvalds out: 5881da177e4SLinus Torvalds release_sock(sk); 5891da177e4SLinus Torvalds return err; 5901da177e4SLinus Torvalds 5911da177e4SLinus Torvalds sock_error: 5921da177e4SLinus Torvalds err = sock_error(sk) ? : -ECONNABORTED; 5931da177e4SLinus Torvalds sock->state = SS_UNCONNECTED; 5941da177e4SLinus Torvalds if (sk->sk_prot->disconnect(sk, flags)) 5951da177e4SLinus Torvalds sock->state = SS_DISCONNECTING; 5961da177e4SLinus Torvalds goto out; 5971da177e4SLinus Torvalds } 5981da177e4SLinus Torvalds 5991da177e4SLinus Torvalds /* 6001da177e4SLinus Torvalds * Accept a pending connection. The TCP layer now gives BSD semantics. 6011da177e4SLinus Torvalds */ 6021da177e4SLinus Torvalds 6031da177e4SLinus Torvalds int inet_accept(struct socket *sock, struct socket *newsock, int flags) 6041da177e4SLinus Torvalds { 6051da177e4SLinus Torvalds struct sock *sk1 = sock->sk; 6061da177e4SLinus Torvalds int err = -EINVAL; 6071da177e4SLinus Torvalds struct sock *sk2 = sk1->sk_prot->accept(sk1, flags, &err); 6081da177e4SLinus Torvalds 6091da177e4SLinus Torvalds if (!sk2) 6101da177e4SLinus Torvalds goto do_err; 6111da177e4SLinus Torvalds 6121da177e4SLinus Torvalds lock_sock(sk2); 6131da177e4SLinus Torvalds 6141da177e4SLinus Torvalds BUG_TRAP((1 << sk2->sk_state) & 6151da177e4SLinus Torvalds (TCPF_ESTABLISHED | TCPF_CLOSE_WAIT | TCPF_CLOSE)); 6161da177e4SLinus Torvalds 6171da177e4SLinus Torvalds sock_graft(sk2, newsock); 6181da177e4SLinus Torvalds 6191da177e4SLinus Torvalds newsock->state = SS_CONNECTED; 6201da177e4SLinus Torvalds err = 0; 6211da177e4SLinus Torvalds release_sock(sk2); 6221da177e4SLinus Torvalds do_err: 6231da177e4SLinus Torvalds return err; 6241da177e4SLinus Torvalds } 6251da177e4SLinus Torvalds 6261da177e4SLinus Torvalds 6271da177e4SLinus Torvalds /* 6281da177e4SLinus Torvalds * This does both peername and sockname. 6291da177e4SLinus Torvalds */ 6301da177e4SLinus Torvalds int inet_getname(struct socket *sock, struct sockaddr *uaddr, 6311da177e4SLinus Torvalds int *uaddr_len, int peer) 6321da177e4SLinus Torvalds { 6331da177e4SLinus Torvalds struct sock *sk = sock->sk; 6341da177e4SLinus Torvalds struct inet_sock *inet = inet_sk(sk); 6351da177e4SLinus Torvalds struct sockaddr_in *sin = (struct sockaddr_in *)uaddr; 6361da177e4SLinus Torvalds 6371da177e4SLinus Torvalds sin->sin_family = AF_INET; 6381da177e4SLinus Torvalds if (peer) { 6391da177e4SLinus Torvalds if (!inet->dport || 6401da177e4SLinus Torvalds (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) && 6411da177e4SLinus Torvalds peer == 1)) 6421da177e4SLinus Torvalds return -ENOTCONN; 6431da177e4SLinus Torvalds sin->sin_port = inet->dport; 6441da177e4SLinus Torvalds sin->sin_addr.s_addr = inet->daddr; 6451da177e4SLinus Torvalds } else { 6461da177e4SLinus Torvalds __u32 addr = inet->rcv_saddr; 6471da177e4SLinus Torvalds if (!addr) 6481da177e4SLinus Torvalds addr = inet->saddr; 6491da177e4SLinus Torvalds sin->sin_port = inet->sport; 6501da177e4SLinus Torvalds sin->sin_addr.s_addr = addr; 6511da177e4SLinus Torvalds } 6521da177e4SLinus Torvalds memset(sin->sin_zero, 0, sizeof(sin->sin_zero)); 6531da177e4SLinus Torvalds *uaddr_len = sizeof(*sin); 6541da177e4SLinus Torvalds return 0; 6551da177e4SLinus Torvalds } 6561da177e4SLinus Torvalds 6571da177e4SLinus Torvalds int inet_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg, 6581da177e4SLinus Torvalds size_t size) 6591da177e4SLinus Torvalds { 6601da177e4SLinus Torvalds struct sock *sk = sock->sk; 6611da177e4SLinus Torvalds 6621da177e4SLinus Torvalds /* We may need to bind the socket. */ 6631da177e4SLinus Torvalds if (!inet_sk(sk)->num && inet_autobind(sk)) 6641da177e4SLinus Torvalds return -EAGAIN; 6651da177e4SLinus Torvalds 6661da177e4SLinus Torvalds return sk->sk_prot->sendmsg(iocb, sk, msg, size); 6671da177e4SLinus Torvalds } 6681da177e4SLinus Torvalds 6691da177e4SLinus Torvalds 6701da177e4SLinus Torvalds static ssize_t inet_sendpage(struct socket *sock, struct page *page, int offset, size_t size, int flags) 6711da177e4SLinus Torvalds { 6721da177e4SLinus Torvalds struct sock *sk = sock->sk; 6731da177e4SLinus Torvalds 6741da177e4SLinus Torvalds /* We may need to bind the socket. */ 6751da177e4SLinus Torvalds if (!inet_sk(sk)->num && inet_autobind(sk)) 6761da177e4SLinus Torvalds return -EAGAIN; 6771da177e4SLinus Torvalds 6781da177e4SLinus Torvalds if (sk->sk_prot->sendpage) 6791da177e4SLinus Torvalds return sk->sk_prot->sendpage(sk, page, offset, size, flags); 6801da177e4SLinus Torvalds return sock_no_sendpage(sock, page, offset, size, flags); 6811da177e4SLinus Torvalds } 6821da177e4SLinus Torvalds 6831da177e4SLinus Torvalds 6841da177e4SLinus Torvalds int inet_shutdown(struct socket *sock, int how) 6851da177e4SLinus Torvalds { 6861da177e4SLinus Torvalds struct sock *sk = sock->sk; 6871da177e4SLinus Torvalds int err = 0; 6881da177e4SLinus Torvalds 6891da177e4SLinus Torvalds /* This should really check to make sure 6901da177e4SLinus Torvalds * the socket is a TCP socket. (WHY AC...) 6911da177e4SLinus Torvalds */ 6921da177e4SLinus Torvalds how++; /* maps 0->1 has the advantage of making bit 1 rcvs and 6931da177e4SLinus Torvalds 1->2 bit 2 snds. 6941da177e4SLinus Torvalds 2->3 */ 6951da177e4SLinus Torvalds if ((how & ~SHUTDOWN_MASK) || !how) /* MAXINT->0 */ 6961da177e4SLinus Torvalds return -EINVAL; 6971da177e4SLinus Torvalds 6981da177e4SLinus Torvalds lock_sock(sk); 6991da177e4SLinus Torvalds if (sock->state == SS_CONNECTING) { 7001da177e4SLinus Torvalds if ((1 << sk->sk_state) & 7011da177e4SLinus Torvalds (TCPF_SYN_SENT | TCPF_SYN_RECV | TCPF_CLOSE)) 7021da177e4SLinus Torvalds sock->state = SS_DISCONNECTING; 7031da177e4SLinus Torvalds else 7041da177e4SLinus Torvalds sock->state = SS_CONNECTED; 7051da177e4SLinus Torvalds } 7061da177e4SLinus Torvalds 7071da177e4SLinus Torvalds switch (sk->sk_state) { 7081da177e4SLinus Torvalds case TCP_CLOSE: 7091da177e4SLinus Torvalds err = -ENOTCONN; 7101da177e4SLinus Torvalds /* Hack to wake up other listeners, who can poll for 7111da177e4SLinus Torvalds POLLHUP, even on eg. unconnected UDP sockets -- RR */ 7121da177e4SLinus Torvalds default: 7131da177e4SLinus Torvalds sk->sk_shutdown |= how; 7141da177e4SLinus Torvalds if (sk->sk_prot->shutdown) 7151da177e4SLinus Torvalds sk->sk_prot->shutdown(sk, how); 7161da177e4SLinus Torvalds break; 7171da177e4SLinus Torvalds 7181da177e4SLinus Torvalds /* Remaining two branches are temporary solution for missing 7191da177e4SLinus Torvalds * close() in multithreaded environment. It is _not_ a good idea, 7201da177e4SLinus Torvalds * but we have no choice until close() is repaired at VFS level. 7211da177e4SLinus Torvalds */ 7221da177e4SLinus Torvalds case TCP_LISTEN: 7231da177e4SLinus Torvalds if (!(how & RCV_SHUTDOWN)) 7241da177e4SLinus Torvalds break; 7251da177e4SLinus Torvalds /* Fall through */ 7261da177e4SLinus Torvalds case TCP_SYN_SENT: 7271da177e4SLinus Torvalds err = sk->sk_prot->disconnect(sk, O_NONBLOCK); 7281da177e4SLinus Torvalds sock->state = err ? SS_DISCONNECTING : SS_UNCONNECTED; 7291da177e4SLinus Torvalds break; 7301da177e4SLinus Torvalds } 7311da177e4SLinus Torvalds 7321da177e4SLinus Torvalds /* Wake up anyone sleeping in poll. */ 7331da177e4SLinus Torvalds sk->sk_state_change(sk); 7341da177e4SLinus Torvalds release_sock(sk); 7351da177e4SLinus Torvalds return err; 7361da177e4SLinus Torvalds } 7371da177e4SLinus Torvalds 7381da177e4SLinus Torvalds /* 7391da177e4SLinus Torvalds * ioctl() calls you can issue on an INET socket. Most of these are 7401da177e4SLinus Torvalds * device configuration and stuff and very rarely used. Some ioctls 7411da177e4SLinus Torvalds * pass on to the socket itself. 7421da177e4SLinus Torvalds * 7431da177e4SLinus Torvalds * NOTE: I like the idea of a module for the config stuff. ie ifconfig 7441da177e4SLinus Torvalds * loads the devconfigure module does its configuring and unloads it. 7451da177e4SLinus Torvalds * There's a good 20K of config code hanging around the kernel. 7461da177e4SLinus Torvalds */ 7471da177e4SLinus Torvalds 7481da177e4SLinus Torvalds int inet_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 7491da177e4SLinus Torvalds { 7501da177e4SLinus Torvalds struct sock *sk = sock->sk; 7511da177e4SLinus Torvalds int err = 0; 7521da177e4SLinus Torvalds 7531da177e4SLinus Torvalds switch (cmd) { 7541da177e4SLinus Torvalds case SIOCGSTAMP: 7551da177e4SLinus Torvalds err = sock_get_timestamp(sk, (struct timeval __user *)arg); 7561da177e4SLinus Torvalds break; 7571da177e4SLinus Torvalds case SIOCADDRT: 7581da177e4SLinus Torvalds case SIOCDELRT: 7591da177e4SLinus Torvalds case SIOCRTMSG: 7601da177e4SLinus Torvalds err = ip_rt_ioctl(cmd, (void __user *)arg); 7611da177e4SLinus Torvalds break; 7621da177e4SLinus Torvalds case SIOCDARP: 7631da177e4SLinus Torvalds case SIOCGARP: 7641da177e4SLinus Torvalds case SIOCSARP: 7651da177e4SLinus Torvalds err = arp_ioctl(cmd, (void __user *)arg); 7661da177e4SLinus Torvalds break; 7671da177e4SLinus Torvalds case SIOCGIFADDR: 7681da177e4SLinus Torvalds case SIOCSIFADDR: 7691da177e4SLinus Torvalds case SIOCGIFBRDADDR: 7701da177e4SLinus Torvalds case SIOCSIFBRDADDR: 7711da177e4SLinus Torvalds case SIOCGIFNETMASK: 7721da177e4SLinus Torvalds case SIOCSIFNETMASK: 7731da177e4SLinus Torvalds case SIOCGIFDSTADDR: 7741da177e4SLinus Torvalds case SIOCSIFDSTADDR: 7751da177e4SLinus Torvalds case SIOCSIFPFLAGS: 7761da177e4SLinus Torvalds case SIOCGIFPFLAGS: 7771da177e4SLinus Torvalds case SIOCSIFFLAGS: 7781da177e4SLinus Torvalds err = devinet_ioctl(cmd, (void __user *)arg); 7791da177e4SLinus Torvalds break; 7801da177e4SLinus Torvalds default: 781b5e5fa5eSChristoph Hellwig if (sk->sk_prot->ioctl) 782b5e5fa5eSChristoph Hellwig err = sk->sk_prot->ioctl(sk, cmd, arg); 783b5e5fa5eSChristoph Hellwig else 784b5e5fa5eSChristoph Hellwig err = -ENOIOCTLCMD; 7851da177e4SLinus Torvalds break; 7861da177e4SLinus Torvalds } 7871da177e4SLinus Torvalds return err; 7881da177e4SLinus Torvalds } 7891da177e4SLinus Torvalds 79090ddc4f0SEric Dumazet const struct proto_ops inet_stream_ops = { 7911da177e4SLinus Torvalds .family = PF_INET, 7921da177e4SLinus Torvalds .owner = THIS_MODULE, 7931da177e4SLinus Torvalds .release = inet_release, 7941da177e4SLinus Torvalds .bind = inet_bind, 7951da177e4SLinus Torvalds .connect = inet_stream_connect, 7961da177e4SLinus Torvalds .socketpair = sock_no_socketpair, 7971da177e4SLinus Torvalds .accept = inet_accept, 7981da177e4SLinus Torvalds .getname = inet_getname, 7991da177e4SLinus Torvalds .poll = tcp_poll, 8001da177e4SLinus Torvalds .ioctl = inet_ioctl, 8011da177e4SLinus Torvalds .listen = inet_listen, 8021da177e4SLinus Torvalds .shutdown = inet_shutdown, 8031da177e4SLinus Torvalds .setsockopt = sock_common_setsockopt, 8041da177e4SLinus Torvalds .getsockopt = sock_common_getsockopt, 8051da177e4SLinus Torvalds .sendmsg = inet_sendmsg, 8061da177e4SLinus Torvalds .recvmsg = sock_common_recvmsg, 8071da177e4SLinus Torvalds .mmap = sock_no_mmap, 8081da177e4SLinus Torvalds .sendpage = tcp_sendpage 8091da177e4SLinus Torvalds }; 8101da177e4SLinus Torvalds 81190ddc4f0SEric Dumazet const struct proto_ops inet_dgram_ops = { 8121da177e4SLinus Torvalds .family = PF_INET, 8131da177e4SLinus Torvalds .owner = THIS_MODULE, 8141da177e4SLinus Torvalds .release = inet_release, 8151da177e4SLinus Torvalds .bind = inet_bind, 8161da177e4SLinus Torvalds .connect = inet_dgram_connect, 8171da177e4SLinus Torvalds .socketpair = sock_no_socketpair, 8181da177e4SLinus Torvalds .accept = sock_no_accept, 8191da177e4SLinus Torvalds .getname = inet_getname, 8201da177e4SLinus Torvalds .poll = udp_poll, 8211da177e4SLinus Torvalds .ioctl = inet_ioctl, 8221da177e4SLinus Torvalds .listen = sock_no_listen, 8231da177e4SLinus Torvalds .shutdown = inet_shutdown, 8241da177e4SLinus Torvalds .setsockopt = sock_common_setsockopt, 8251da177e4SLinus Torvalds .getsockopt = sock_common_getsockopt, 8261da177e4SLinus Torvalds .sendmsg = inet_sendmsg, 8271da177e4SLinus Torvalds .recvmsg = sock_common_recvmsg, 8281da177e4SLinus Torvalds .mmap = sock_no_mmap, 8291da177e4SLinus Torvalds .sendpage = inet_sendpage, 8301da177e4SLinus Torvalds }; 8311da177e4SLinus Torvalds 8321da177e4SLinus Torvalds /* 8331da177e4SLinus Torvalds * For SOCK_RAW sockets; should be the same as inet_dgram_ops but without 8341da177e4SLinus Torvalds * udp_poll 8351da177e4SLinus Torvalds */ 83690ddc4f0SEric Dumazet static const struct proto_ops inet_sockraw_ops = { 8371da177e4SLinus Torvalds .family = PF_INET, 8381da177e4SLinus Torvalds .owner = THIS_MODULE, 8391da177e4SLinus Torvalds .release = inet_release, 8401da177e4SLinus Torvalds .bind = inet_bind, 8411da177e4SLinus Torvalds .connect = inet_dgram_connect, 8421da177e4SLinus Torvalds .socketpair = sock_no_socketpair, 8431da177e4SLinus Torvalds .accept = sock_no_accept, 8441da177e4SLinus Torvalds .getname = inet_getname, 8451da177e4SLinus Torvalds .poll = datagram_poll, 8461da177e4SLinus Torvalds .ioctl = inet_ioctl, 8471da177e4SLinus Torvalds .listen = sock_no_listen, 8481da177e4SLinus Torvalds .shutdown = inet_shutdown, 8491da177e4SLinus Torvalds .setsockopt = sock_common_setsockopt, 8501da177e4SLinus Torvalds .getsockopt = sock_common_getsockopt, 8511da177e4SLinus Torvalds .sendmsg = inet_sendmsg, 8521da177e4SLinus Torvalds .recvmsg = sock_common_recvmsg, 8531da177e4SLinus Torvalds .mmap = sock_no_mmap, 8541da177e4SLinus Torvalds .sendpage = inet_sendpage, 8551da177e4SLinus Torvalds }; 8561da177e4SLinus Torvalds 8571da177e4SLinus Torvalds static struct net_proto_family inet_family_ops = { 8581da177e4SLinus Torvalds .family = PF_INET, 8591da177e4SLinus Torvalds .create = inet_create, 8601da177e4SLinus Torvalds .owner = THIS_MODULE, 8611da177e4SLinus Torvalds }; 8621da177e4SLinus Torvalds 8631da177e4SLinus Torvalds /* Upon startup we insert all the elements in inetsw_array[] into 8641da177e4SLinus Torvalds * the linked list inetsw. 8651da177e4SLinus Torvalds */ 8661da177e4SLinus Torvalds static struct inet_protosw inetsw_array[] = 8671da177e4SLinus Torvalds { 8681da177e4SLinus Torvalds { 8691da177e4SLinus Torvalds .type = SOCK_STREAM, 8701da177e4SLinus Torvalds .protocol = IPPROTO_TCP, 8711da177e4SLinus Torvalds .prot = &tcp_prot, 8721da177e4SLinus Torvalds .ops = &inet_stream_ops, 8731da177e4SLinus Torvalds .capability = -1, 8741da177e4SLinus Torvalds .no_check = 0, 875d83d8461SArnaldo Carvalho de Melo .flags = INET_PROTOSW_PERMANENT | 876d83d8461SArnaldo Carvalho de Melo INET_PROTOSW_ICSK, 8771da177e4SLinus Torvalds }, 8781da177e4SLinus Torvalds 8791da177e4SLinus Torvalds { 8801da177e4SLinus Torvalds .type = SOCK_DGRAM, 8811da177e4SLinus Torvalds .protocol = IPPROTO_UDP, 8821da177e4SLinus Torvalds .prot = &udp_prot, 8831da177e4SLinus Torvalds .ops = &inet_dgram_ops, 8841da177e4SLinus Torvalds .capability = -1, 8851da177e4SLinus Torvalds .no_check = UDP_CSUM_DEFAULT, 8861da177e4SLinus Torvalds .flags = INET_PROTOSW_PERMANENT, 8871da177e4SLinus Torvalds }, 8881da177e4SLinus Torvalds 8891da177e4SLinus Torvalds 8901da177e4SLinus Torvalds { 8911da177e4SLinus Torvalds .type = SOCK_RAW, 8921da177e4SLinus Torvalds .protocol = IPPROTO_IP, /* wild card */ 8931da177e4SLinus Torvalds .prot = &raw_prot, 8941da177e4SLinus Torvalds .ops = &inet_sockraw_ops, 8951da177e4SLinus Torvalds .capability = CAP_NET_RAW, 8961da177e4SLinus Torvalds .no_check = UDP_CSUM_DEFAULT, 8971da177e4SLinus Torvalds .flags = INET_PROTOSW_REUSE, 8981da177e4SLinus Torvalds } 8991da177e4SLinus Torvalds }; 9001da177e4SLinus Torvalds 9011da177e4SLinus Torvalds #define INETSW_ARRAY_LEN (sizeof(inetsw_array) / sizeof(struct inet_protosw)) 9021da177e4SLinus Torvalds 9031da177e4SLinus Torvalds void inet_register_protosw(struct inet_protosw *p) 9041da177e4SLinus Torvalds { 9051da177e4SLinus Torvalds struct list_head *lh; 9061da177e4SLinus Torvalds struct inet_protosw *answer; 9071da177e4SLinus Torvalds int protocol = p->protocol; 9081da177e4SLinus Torvalds struct list_head *last_perm; 9091da177e4SLinus Torvalds 9101da177e4SLinus Torvalds spin_lock_bh(&inetsw_lock); 9111da177e4SLinus Torvalds 9121da177e4SLinus Torvalds if (p->type >= SOCK_MAX) 9131da177e4SLinus Torvalds goto out_illegal; 9141da177e4SLinus Torvalds 9151da177e4SLinus Torvalds /* If we are trying to override a permanent protocol, bail. */ 9161da177e4SLinus Torvalds answer = NULL; 9171da177e4SLinus Torvalds last_perm = &inetsw[p->type]; 9181da177e4SLinus Torvalds list_for_each(lh, &inetsw[p->type]) { 9191da177e4SLinus Torvalds answer = list_entry(lh, struct inet_protosw, list); 9201da177e4SLinus Torvalds 9211da177e4SLinus Torvalds /* Check only the non-wild match. */ 9221da177e4SLinus Torvalds if (INET_PROTOSW_PERMANENT & answer->flags) { 9231da177e4SLinus Torvalds if (protocol == answer->protocol) 9241da177e4SLinus Torvalds break; 9251da177e4SLinus Torvalds last_perm = lh; 9261da177e4SLinus Torvalds } 9271da177e4SLinus Torvalds 9281da177e4SLinus Torvalds answer = NULL; 9291da177e4SLinus Torvalds } 9301da177e4SLinus Torvalds if (answer) 9311da177e4SLinus Torvalds goto out_permanent; 9321da177e4SLinus Torvalds 9331da177e4SLinus Torvalds /* Add the new entry after the last permanent entry if any, so that 9341da177e4SLinus Torvalds * the new entry does not override a permanent entry when matched with 9351da177e4SLinus Torvalds * a wild-card protocol. But it is allowed to override any existing 9361da177e4SLinus Torvalds * non-permanent entry. This means that when we remove this entry, the 9371da177e4SLinus Torvalds * system automatically returns to the old behavior. 9381da177e4SLinus Torvalds */ 9391da177e4SLinus Torvalds list_add_rcu(&p->list, last_perm); 9401da177e4SLinus Torvalds out: 9411da177e4SLinus Torvalds spin_unlock_bh(&inetsw_lock); 9421da177e4SLinus Torvalds 9431da177e4SLinus Torvalds synchronize_net(); 9441da177e4SLinus Torvalds 9451da177e4SLinus Torvalds return; 9461da177e4SLinus Torvalds 9471da177e4SLinus Torvalds out_permanent: 9481da177e4SLinus Torvalds printk(KERN_ERR "Attempt to override permanent protocol %d.\n", 9491da177e4SLinus Torvalds protocol); 9501da177e4SLinus Torvalds goto out; 9511da177e4SLinus Torvalds 9521da177e4SLinus Torvalds out_illegal: 9531da177e4SLinus Torvalds printk(KERN_ERR 9541da177e4SLinus Torvalds "Ignoring attempt to register invalid socket type %d.\n", 9551da177e4SLinus Torvalds p->type); 9561da177e4SLinus Torvalds goto out; 9571da177e4SLinus Torvalds } 9581da177e4SLinus Torvalds 9591da177e4SLinus Torvalds void inet_unregister_protosw(struct inet_protosw *p) 9601da177e4SLinus Torvalds { 9611da177e4SLinus Torvalds if (INET_PROTOSW_PERMANENT & p->flags) { 9621da177e4SLinus Torvalds printk(KERN_ERR 9631da177e4SLinus Torvalds "Attempt to unregister permanent protocol %d.\n", 9641da177e4SLinus Torvalds p->protocol); 9651da177e4SLinus Torvalds } else { 9661da177e4SLinus Torvalds spin_lock_bh(&inetsw_lock); 9671da177e4SLinus Torvalds list_del_rcu(&p->list); 9681da177e4SLinus Torvalds spin_unlock_bh(&inetsw_lock); 9691da177e4SLinus Torvalds 9701da177e4SLinus Torvalds synchronize_net(); 9711da177e4SLinus Torvalds } 9721da177e4SLinus Torvalds } 9731da177e4SLinus Torvalds 97432519f11SArnaldo Carvalho de Melo /* 97532519f11SArnaldo Carvalho de Melo * Shall we try to damage output packets if routing dev changes? 97632519f11SArnaldo Carvalho de Melo */ 97732519f11SArnaldo Carvalho de Melo 97832519f11SArnaldo Carvalho de Melo int sysctl_ip_dynaddr; 97932519f11SArnaldo Carvalho de Melo 98032519f11SArnaldo Carvalho de Melo static int inet_sk_reselect_saddr(struct sock *sk) 98132519f11SArnaldo Carvalho de Melo { 98232519f11SArnaldo Carvalho de Melo struct inet_sock *inet = inet_sk(sk); 98332519f11SArnaldo Carvalho de Melo int err; 98432519f11SArnaldo Carvalho de Melo struct rtable *rt; 98532519f11SArnaldo Carvalho de Melo __u32 old_saddr = inet->saddr; 98632519f11SArnaldo Carvalho de Melo __u32 new_saddr; 98732519f11SArnaldo Carvalho de Melo __u32 daddr = inet->daddr; 98832519f11SArnaldo Carvalho de Melo 98932519f11SArnaldo Carvalho de Melo if (inet->opt && inet->opt->srr) 99032519f11SArnaldo Carvalho de Melo daddr = inet->opt->faddr; 99132519f11SArnaldo Carvalho de Melo 99232519f11SArnaldo Carvalho de Melo /* Query new route. */ 99332519f11SArnaldo Carvalho de Melo err = ip_route_connect(&rt, daddr, 0, 99432519f11SArnaldo Carvalho de Melo RT_CONN_FLAGS(sk), 99532519f11SArnaldo Carvalho de Melo sk->sk_bound_dev_if, 99632519f11SArnaldo Carvalho de Melo sk->sk_protocol, 99732519f11SArnaldo Carvalho de Melo inet->sport, inet->dport, sk); 99832519f11SArnaldo Carvalho de Melo if (err) 99932519f11SArnaldo Carvalho de Melo return err; 100032519f11SArnaldo Carvalho de Melo 100132519f11SArnaldo Carvalho de Melo sk_setup_caps(sk, &rt->u.dst); 100232519f11SArnaldo Carvalho de Melo 100332519f11SArnaldo Carvalho de Melo new_saddr = rt->rt_src; 100432519f11SArnaldo Carvalho de Melo 100532519f11SArnaldo Carvalho de Melo if (new_saddr == old_saddr) 100632519f11SArnaldo Carvalho de Melo return 0; 100732519f11SArnaldo Carvalho de Melo 100832519f11SArnaldo Carvalho de Melo if (sysctl_ip_dynaddr > 1) { 100932519f11SArnaldo Carvalho de Melo printk(KERN_INFO "%s(): shifting inet->" 101032519f11SArnaldo Carvalho de Melo "saddr from %d.%d.%d.%d to %d.%d.%d.%d\n", 101132519f11SArnaldo Carvalho de Melo __FUNCTION__, 101232519f11SArnaldo Carvalho de Melo NIPQUAD(old_saddr), 101332519f11SArnaldo Carvalho de Melo NIPQUAD(new_saddr)); 101432519f11SArnaldo Carvalho de Melo } 101532519f11SArnaldo Carvalho de Melo 101632519f11SArnaldo Carvalho de Melo inet->saddr = inet->rcv_saddr = new_saddr; 101732519f11SArnaldo Carvalho de Melo 101832519f11SArnaldo Carvalho de Melo /* 101932519f11SArnaldo Carvalho de Melo * XXX The only one ugly spot where we need to 102032519f11SArnaldo Carvalho de Melo * XXX really change the sockets identity after 102132519f11SArnaldo Carvalho de Melo * XXX it has entered the hashes. -DaveM 102232519f11SArnaldo Carvalho de Melo * 102332519f11SArnaldo Carvalho de Melo * Besides that, it does not check for connection 102432519f11SArnaldo Carvalho de Melo * uniqueness. Wait for troubles. 102532519f11SArnaldo Carvalho de Melo */ 102632519f11SArnaldo Carvalho de Melo __sk_prot_rehash(sk); 102732519f11SArnaldo Carvalho de Melo return 0; 102832519f11SArnaldo Carvalho de Melo } 102932519f11SArnaldo Carvalho de Melo 103032519f11SArnaldo Carvalho de Melo int inet_sk_rebuild_header(struct sock *sk) 103132519f11SArnaldo Carvalho de Melo { 103232519f11SArnaldo Carvalho de Melo struct inet_sock *inet = inet_sk(sk); 103332519f11SArnaldo Carvalho de Melo struct rtable *rt = (struct rtable *)__sk_dst_check(sk, 0); 103432519f11SArnaldo Carvalho de Melo u32 daddr; 103532519f11SArnaldo Carvalho de Melo int err; 103632519f11SArnaldo Carvalho de Melo 103732519f11SArnaldo Carvalho de Melo /* Route is OK, nothing to do. */ 103832519f11SArnaldo Carvalho de Melo if (rt) 103932519f11SArnaldo Carvalho de Melo return 0; 104032519f11SArnaldo Carvalho de Melo 104132519f11SArnaldo Carvalho de Melo /* Reroute. */ 104232519f11SArnaldo Carvalho de Melo daddr = inet->daddr; 104332519f11SArnaldo Carvalho de Melo if (inet->opt && inet->opt->srr) 104432519f11SArnaldo Carvalho de Melo daddr = inet->opt->faddr; 104532519f11SArnaldo Carvalho de Melo { 104632519f11SArnaldo Carvalho de Melo struct flowi fl = { 104732519f11SArnaldo Carvalho de Melo .oif = sk->sk_bound_dev_if, 104832519f11SArnaldo Carvalho de Melo .nl_u = { 104932519f11SArnaldo Carvalho de Melo .ip4_u = { 105032519f11SArnaldo Carvalho de Melo .daddr = daddr, 105132519f11SArnaldo Carvalho de Melo .saddr = inet->saddr, 105232519f11SArnaldo Carvalho de Melo .tos = RT_CONN_FLAGS(sk), 105332519f11SArnaldo Carvalho de Melo }, 105432519f11SArnaldo Carvalho de Melo }, 105532519f11SArnaldo Carvalho de Melo .proto = sk->sk_protocol, 105632519f11SArnaldo Carvalho de Melo .uli_u = { 105732519f11SArnaldo Carvalho de Melo .ports = { 105832519f11SArnaldo Carvalho de Melo .sport = inet->sport, 105932519f11SArnaldo Carvalho de Melo .dport = inet->dport, 106032519f11SArnaldo Carvalho de Melo }, 106132519f11SArnaldo Carvalho de Melo }, 106232519f11SArnaldo Carvalho de Melo }; 106332519f11SArnaldo Carvalho de Melo 106432519f11SArnaldo Carvalho de Melo err = ip_route_output_flow(&rt, &fl, sk, 0); 106532519f11SArnaldo Carvalho de Melo } 106632519f11SArnaldo Carvalho de Melo if (!err) 106732519f11SArnaldo Carvalho de Melo sk_setup_caps(sk, &rt->u.dst); 106832519f11SArnaldo Carvalho de Melo else { 106932519f11SArnaldo Carvalho de Melo /* Routing failed... */ 107032519f11SArnaldo Carvalho de Melo sk->sk_route_caps = 0; 107132519f11SArnaldo Carvalho de Melo /* 107232519f11SArnaldo Carvalho de Melo * Other protocols have to map its equivalent state to TCP_SYN_SENT. 107332519f11SArnaldo Carvalho de Melo * DCCP maps its DCCP_REQUESTING state to TCP_SYN_SENT. -acme 107432519f11SArnaldo Carvalho de Melo */ 107532519f11SArnaldo Carvalho de Melo if (!sysctl_ip_dynaddr || 107632519f11SArnaldo Carvalho de Melo sk->sk_state != TCP_SYN_SENT || 107732519f11SArnaldo Carvalho de Melo (sk->sk_userlocks & SOCK_BINDADDR_LOCK) || 107832519f11SArnaldo Carvalho de Melo (err = inet_sk_reselect_saddr(sk)) != 0) 107932519f11SArnaldo Carvalho de Melo sk->sk_err_soft = -err; 108032519f11SArnaldo Carvalho de Melo } 108132519f11SArnaldo Carvalho de Melo 108232519f11SArnaldo Carvalho de Melo return err; 108332519f11SArnaldo Carvalho de Melo } 108432519f11SArnaldo Carvalho de Melo 108532519f11SArnaldo Carvalho de Melo EXPORT_SYMBOL(inet_sk_rebuild_header); 108632519f11SArnaldo Carvalho de Melo 10871da177e4SLinus Torvalds #ifdef CONFIG_IP_MULTICAST 10881da177e4SLinus Torvalds static struct net_protocol igmp_protocol = { 10891da177e4SLinus Torvalds .handler = igmp_rcv, 10901da177e4SLinus Torvalds }; 10911da177e4SLinus Torvalds #endif 10921da177e4SLinus Torvalds 10931da177e4SLinus Torvalds static struct net_protocol tcp_protocol = { 10941da177e4SLinus Torvalds .handler = tcp_v4_rcv, 10951da177e4SLinus Torvalds .err_handler = tcp_v4_err, 10961da177e4SLinus Torvalds .no_policy = 1, 10971da177e4SLinus Torvalds }; 10981da177e4SLinus Torvalds 10991da177e4SLinus Torvalds static struct net_protocol udp_protocol = { 11001da177e4SLinus Torvalds .handler = udp_rcv, 11011da177e4SLinus Torvalds .err_handler = udp_err, 11021da177e4SLinus Torvalds .no_policy = 1, 11031da177e4SLinus Torvalds }; 11041da177e4SLinus Torvalds 11051da177e4SLinus Torvalds static struct net_protocol icmp_protocol = { 11061da177e4SLinus Torvalds .handler = icmp_rcv, 11071da177e4SLinus Torvalds }; 11081da177e4SLinus Torvalds 11091da177e4SLinus Torvalds static int __init init_ipv4_mibs(void) 11101da177e4SLinus Torvalds { 11111da177e4SLinus Torvalds net_statistics[0] = alloc_percpu(struct linux_mib); 11121da177e4SLinus Torvalds net_statistics[1] = alloc_percpu(struct linux_mib); 11131da177e4SLinus Torvalds ip_statistics[0] = alloc_percpu(struct ipstats_mib); 11141da177e4SLinus Torvalds ip_statistics[1] = alloc_percpu(struct ipstats_mib); 11151da177e4SLinus Torvalds icmp_statistics[0] = alloc_percpu(struct icmp_mib); 11161da177e4SLinus Torvalds icmp_statistics[1] = alloc_percpu(struct icmp_mib); 11171da177e4SLinus Torvalds tcp_statistics[0] = alloc_percpu(struct tcp_mib); 11181da177e4SLinus Torvalds tcp_statistics[1] = alloc_percpu(struct tcp_mib); 11191da177e4SLinus Torvalds udp_statistics[0] = alloc_percpu(struct udp_mib); 11201da177e4SLinus Torvalds udp_statistics[1] = alloc_percpu(struct udp_mib); 11211da177e4SLinus Torvalds if (! 11221da177e4SLinus Torvalds (net_statistics[0] && net_statistics[1] && ip_statistics[0] 11231da177e4SLinus Torvalds && ip_statistics[1] && tcp_statistics[0] && tcp_statistics[1] 11241da177e4SLinus Torvalds && udp_statistics[0] && udp_statistics[1])) 11251da177e4SLinus Torvalds return -ENOMEM; 11261da177e4SLinus Torvalds 11271da177e4SLinus Torvalds (void) tcp_mib_init(); 11281da177e4SLinus Torvalds 11291da177e4SLinus Torvalds return 0; 11301da177e4SLinus Torvalds } 11311da177e4SLinus Torvalds 11321da177e4SLinus Torvalds static int ipv4_proc_init(void); 11331da177e4SLinus Torvalds 113430e224d7SHerbert Xu /* 113530e224d7SHerbert Xu * IP protocol layer initialiser 113630e224d7SHerbert Xu */ 113730e224d7SHerbert Xu 113830e224d7SHerbert Xu static struct packet_type ip_packet_type = { 113930e224d7SHerbert Xu .type = __constant_htons(ETH_P_IP), 114030e224d7SHerbert Xu .func = ip_rcv, 114130e224d7SHerbert Xu }; 114230e224d7SHerbert Xu 11431da177e4SLinus Torvalds static int __init inet_init(void) 11441da177e4SLinus Torvalds { 11451da177e4SLinus Torvalds struct sk_buff *dummy_skb; 11461da177e4SLinus Torvalds struct inet_protosw *q; 11471da177e4SLinus Torvalds struct list_head *r; 11481da177e4SLinus Torvalds int rc = -EINVAL; 11491da177e4SLinus Torvalds 11501da177e4SLinus Torvalds if (sizeof(struct inet_skb_parm) > sizeof(dummy_skb->cb)) { 11511da177e4SLinus Torvalds printk(KERN_CRIT "%s: panic\n", __FUNCTION__); 11521da177e4SLinus Torvalds goto out; 11531da177e4SLinus Torvalds } 11541da177e4SLinus Torvalds 11551da177e4SLinus Torvalds rc = proto_register(&tcp_prot, 1); 11561da177e4SLinus Torvalds if (rc) 11571da177e4SLinus Torvalds goto out; 11581da177e4SLinus Torvalds 11591da177e4SLinus Torvalds rc = proto_register(&udp_prot, 1); 11601da177e4SLinus Torvalds if (rc) 11611da177e4SLinus Torvalds goto out_unregister_tcp_proto; 11621da177e4SLinus Torvalds 11631da177e4SLinus Torvalds rc = proto_register(&raw_prot, 1); 11641da177e4SLinus Torvalds if (rc) 11651da177e4SLinus Torvalds goto out_unregister_udp_proto; 11661da177e4SLinus Torvalds 11671da177e4SLinus Torvalds /* 11681da177e4SLinus Torvalds * Tell SOCKET that we are alive... 11691da177e4SLinus Torvalds */ 11701da177e4SLinus Torvalds 11711da177e4SLinus Torvalds (void)sock_register(&inet_family_ops); 11721da177e4SLinus Torvalds 11731da177e4SLinus Torvalds /* 11741da177e4SLinus Torvalds * Add all the base protocols. 11751da177e4SLinus Torvalds */ 11761da177e4SLinus Torvalds 11771da177e4SLinus Torvalds if (inet_add_protocol(&icmp_protocol, IPPROTO_ICMP) < 0) 11781da177e4SLinus Torvalds printk(KERN_CRIT "inet_init: Cannot add ICMP protocol\n"); 11791da177e4SLinus Torvalds if (inet_add_protocol(&udp_protocol, IPPROTO_UDP) < 0) 11801da177e4SLinus Torvalds printk(KERN_CRIT "inet_init: Cannot add UDP protocol\n"); 11811da177e4SLinus Torvalds if (inet_add_protocol(&tcp_protocol, IPPROTO_TCP) < 0) 11821da177e4SLinus Torvalds printk(KERN_CRIT "inet_init: Cannot add TCP protocol\n"); 11831da177e4SLinus Torvalds #ifdef CONFIG_IP_MULTICAST 11841da177e4SLinus Torvalds if (inet_add_protocol(&igmp_protocol, IPPROTO_IGMP) < 0) 11851da177e4SLinus Torvalds printk(KERN_CRIT "inet_init: Cannot add IGMP protocol\n"); 11861da177e4SLinus Torvalds #endif 11871da177e4SLinus Torvalds 11881da177e4SLinus Torvalds /* Register the socket-side information for inet_create. */ 11891da177e4SLinus Torvalds for (r = &inetsw[0]; r < &inetsw[SOCK_MAX]; ++r) 11901da177e4SLinus Torvalds INIT_LIST_HEAD(r); 11911da177e4SLinus Torvalds 11921da177e4SLinus Torvalds for (q = inetsw_array; q < &inetsw_array[INETSW_ARRAY_LEN]; ++q) 11931da177e4SLinus Torvalds inet_register_protosw(q); 11941da177e4SLinus Torvalds 11951da177e4SLinus Torvalds /* 11961da177e4SLinus Torvalds * Set the ARP module up 11971da177e4SLinus Torvalds */ 11981da177e4SLinus Torvalds 11991da177e4SLinus Torvalds arp_init(); 12001da177e4SLinus Torvalds 12011da177e4SLinus Torvalds /* 12021da177e4SLinus Torvalds * Set the IP module up 12031da177e4SLinus Torvalds */ 12041da177e4SLinus Torvalds 12051da177e4SLinus Torvalds ip_init(); 12061da177e4SLinus Torvalds 12071da177e4SLinus Torvalds tcp_v4_init(&inet_family_ops); 12081da177e4SLinus Torvalds 12091da177e4SLinus Torvalds /* Setup TCP slab cache for open requests. */ 12101da177e4SLinus Torvalds tcp_init(); 12111da177e4SLinus Torvalds 12121da177e4SLinus Torvalds 12131da177e4SLinus Torvalds /* 12141da177e4SLinus Torvalds * Set the ICMP layer up 12151da177e4SLinus Torvalds */ 12161da177e4SLinus Torvalds 12171da177e4SLinus Torvalds icmp_init(&inet_family_ops); 12181da177e4SLinus Torvalds 12191da177e4SLinus Torvalds /* 12201da177e4SLinus Torvalds * Initialise the multicast router 12211da177e4SLinus Torvalds */ 12221da177e4SLinus Torvalds #if defined(CONFIG_IP_MROUTE) 12231da177e4SLinus Torvalds ip_mr_init(); 12241da177e4SLinus Torvalds #endif 12251da177e4SLinus Torvalds /* 12261da177e4SLinus Torvalds * Initialise per-cpu ipv4 mibs 12271da177e4SLinus Torvalds */ 12281da177e4SLinus Torvalds 12291da177e4SLinus Torvalds if(init_ipv4_mibs()) 12301da177e4SLinus Torvalds printk(KERN_CRIT "inet_init: Cannot init ipv4 mibs\n"); ; 12311da177e4SLinus Torvalds 12321da177e4SLinus Torvalds ipv4_proc_init(); 12331da177e4SLinus Torvalds 12341da177e4SLinus Torvalds ipfrag_init(); 12351da177e4SLinus Torvalds 123630e224d7SHerbert Xu dev_add_pack(&ip_packet_type); 123730e224d7SHerbert Xu 12381da177e4SLinus Torvalds rc = 0; 12391da177e4SLinus Torvalds out: 12401da177e4SLinus Torvalds return rc; 12411da177e4SLinus Torvalds out_unregister_tcp_proto: 12421da177e4SLinus Torvalds proto_unregister(&tcp_prot); 12431da177e4SLinus Torvalds out_unregister_udp_proto: 12441da177e4SLinus Torvalds proto_unregister(&udp_prot); 12451da177e4SLinus Torvalds goto out; 12461da177e4SLinus Torvalds } 12471da177e4SLinus Torvalds 12481da177e4SLinus Torvalds module_init(inet_init); 12491da177e4SLinus Torvalds 12501da177e4SLinus Torvalds /* ------------------------------------------------------------------------ */ 12511da177e4SLinus Torvalds 12521da177e4SLinus Torvalds #ifdef CONFIG_PROC_FS 12531da177e4SLinus Torvalds static int __init ipv4_proc_init(void) 12541da177e4SLinus Torvalds { 12551da177e4SLinus Torvalds int rc = 0; 12561da177e4SLinus Torvalds 12571da177e4SLinus Torvalds if (raw_proc_init()) 12581da177e4SLinus Torvalds goto out_raw; 12591da177e4SLinus Torvalds if (tcp4_proc_init()) 12601da177e4SLinus Torvalds goto out_tcp; 12611da177e4SLinus Torvalds if (udp4_proc_init()) 12621da177e4SLinus Torvalds goto out_udp; 12631da177e4SLinus Torvalds if (fib_proc_init()) 12641da177e4SLinus Torvalds goto out_fib; 12651da177e4SLinus Torvalds if (ip_misc_proc_init()) 12661da177e4SLinus Torvalds goto out_misc; 12671da177e4SLinus Torvalds out: 12681da177e4SLinus Torvalds return rc; 12691da177e4SLinus Torvalds out_misc: 12701da177e4SLinus Torvalds fib_proc_exit(); 12711da177e4SLinus Torvalds out_fib: 12721da177e4SLinus Torvalds udp4_proc_exit(); 12731da177e4SLinus Torvalds out_udp: 12741da177e4SLinus Torvalds tcp4_proc_exit(); 12751da177e4SLinus Torvalds out_tcp: 12761da177e4SLinus Torvalds raw_proc_exit(); 12771da177e4SLinus Torvalds out_raw: 12781da177e4SLinus Torvalds rc = -ENOMEM; 12791da177e4SLinus Torvalds goto out; 12801da177e4SLinus Torvalds } 12811da177e4SLinus Torvalds 12821da177e4SLinus Torvalds #else /* CONFIG_PROC_FS */ 12831da177e4SLinus Torvalds static int __init ipv4_proc_init(void) 12841da177e4SLinus Torvalds { 12851da177e4SLinus Torvalds return 0; 12861da177e4SLinus Torvalds } 12871da177e4SLinus Torvalds #endif /* CONFIG_PROC_FS */ 12881da177e4SLinus Torvalds 12891da177e4SLinus Torvalds MODULE_ALIAS_NETPROTO(PF_INET); 12901da177e4SLinus Torvalds 12911da177e4SLinus Torvalds EXPORT_SYMBOL(inet_accept); 12921da177e4SLinus Torvalds EXPORT_SYMBOL(inet_bind); 12931da177e4SLinus Torvalds EXPORT_SYMBOL(inet_dgram_connect); 12941da177e4SLinus Torvalds EXPORT_SYMBOL(inet_dgram_ops); 12951da177e4SLinus Torvalds EXPORT_SYMBOL(inet_getname); 12961da177e4SLinus Torvalds EXPORT_SYMBOL(inet_ioctl); 12971da177e4SLinus Torvalds EXPORT_SYMBOL(inet_listen); 12981da177e4SLinus Torvalds EXPORT_SYMBOL(inet_register_protosw); 12991da177e4SLinus Torvalds EXPORT_SYMBOL(inet_release); 13001da177e4SLinus Torvalds EXPORT_SYMBOL(inet_sendmsg); 13011da177e4SLinus Torvalds EXPORT_SYMBOL(inet_shutdown); 13021da177e4SLinus Torvalds EXPORT_SYMBOL(inet_sock_destruct); 13031da177e4SLinus Torvalds EXPORT_SYMBOL(inet_stream_connect); 13041da177e4SLinus Torvalds EXPORT_SYMBOL(inet_stream_ops); 13051da177e4SLinus Torvalds EXPORT_SYMBOL(inet_unregister_protosw); 13061da177e4SLinus Torvalds EXPORT_SYMBOL(net_statistics); 1307cdac4e07SNeil Horman EXPORT_SYMBOL(sysctl_ip_nonlocal_bind); 1308