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 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> 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> 107ba4e58ecSGerrit Renker #include <net/udplite.h> 1081da177e4SLinus Torvalds #include <linux/skbuff.h> 1091da177e4SLinus Torvalds #include <net/sock.h> 1101da177e4SLinus Torvalds #include <net/raw.h> 1111da177e4SLinus Torvalds #include <net/icmp.h> 1121da177e4SLinus Torvalds #include <net/ipip.h> 1131da177e4SLinus Torvalds #include <net/inet_common.h> 1141da177e4SLinus Torvalds #include <net/xfrm.h> 1151da177e4SLinus Torvalds #ifdef CONFIG_IP_MROUTE 1161da177e4SLinus Torvalds #include <linux/mroute.h> 1171da177e4SLinus Torvalds #endif 1181da177e4SLinus Torvalds 119ba89966cSEric Dumazet DEFINE_SNMP_STAT(struct linux_mib, net_statistics) __read_mostly; 1201da177e4SLinus Torvalds 1211da177e4SLinus Torvalds extern void ip_mc_drop_socket(struct sock *sk); 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 1381da177e4SLinus Torvalds if (sk->sk_type == SOCK_STREAM && sk->sk_state != TCP_CLOSE) { 1391da177e4SLinus Torvalds printk("Attempt to release TCP socket in state %d %p\n", 1401da177e4SLinus Torvalds sk->sk_state, sk); 1411da177e4SLinus Torvalds return; 1421da177e4SLinus Torvalds } 1431da177e4SLinus Torvalds if (!sock_flag(sk, SOCK_DEAD)) { 1441da177e4SLinus Torvalds printk("Attempt to release alive inet socket %p\n", sk); 1451da177e4SLinus Torvalds return; 1461da177e4SLinus Torvalds } 1471da177e4SLinus Torvalds 1481da177e4SLinus Torvalds BUG_TRAP(!atomic_read(&sk->sk_rmem_alloc)); 1491da177e4SLinus Torvalds BUG_TRAP(!atomic_read(&sk->sk_wmem_alloc)); 1501da177e4SLinus Torvalds BUG_TRAP(!sk->sk_wmem_queued); 1511da177e4SLinus Torvalds BUG_TRAP(!sk->sk_forward_alloc); 1521da177e4SLinus Torvalds 1531da177e4SLinus Torvalds kfree(inet->opt); 1541da177e4SLinus Torvalds dst_release(sk->sk_dst_cache); 155e6848976SArnaldo Carvalho de Melo sk_refcnt_debug_dec(sk); 1561da177e4SLinus Torvalds } 1571da177e4SLinus Torvalds 1581da177e4SLinus Torvalds /* 1591da177e4SLinus Torvalds * The routines beyond this point handle the behaviour of an AF_INET 1601da177e4SLinus Torvalds * socket object. Mostly it punts to the subprotocols of IP to do 1611da177e4SLinus Torvalds * the work. 1621da177e4SLinus Torvalds */ 1631da177e4SLinus Torvalds 1641da177e4SLinus Torvalds /* 1651da177e4SLinus Torvalds * Automatically bind an unbound socket. 1661da177e4SLinus Torvalds */ 1671da177e4SLinus Torvalds 1681da177e4SLinus Torvalds static int inet_autobind(struct sock *sk) 1691da177e4SLinus Torvalds { 1701da177e4SLinus Torvalds struct inet_sock *inet; 1711da177e4SLinus Torvalds /* We may need to bind the socket. */ 1721da177e4SLinus Torvalds lock_sock(sk); 1731da177e4SLinus Torvalds inet = inet_sk(sk); 1741da177e4SLinus Torvalds if (!inet->num) { 1751da177e4SLinus Torvalds if (sk->sk_prot->get_port(sk, 0)) { 1761da177e4SLinus Torvalds release_sock(sk); 1771da177e4SLinus Torvalds return -EAGAIN; 1781da177e4SLinus Torvalds } 1791da177e4SLinus Torvalds inet->sport = htons(inet->num); 1801da177e4SLinus Torvalds } 1811da177e4SLinus Torvalds release_sock(sk); 1821da177e4SLinus Torvalds return 0; 1831da177e4SLinus Torvalds } 1841da177e4SLinus Torvalds 1851da177e4SLinus Torvalds /* 1861da177e4SLinus Torvalds * Move a socket into listening state. 1871da177e4SLinus Torvalds */ 1881da177e4SLinus Torvalds int inet_listen(struct socket *sock, int backlog) 1891da177e4SLinus Torvalds { 1901da177e4SLinus Torvalds struct sock *sk = sock->sk; 1911da177e4SLinus Torvalds unsigned char old_state; 1921da177e4SLinus Torvalds int err; 1931da177e4SLinus Torvalds 1941da177e4SLinus Torvalds lock_sock(sk); 1951da177e4SLinus Torvalds 1961da177e4SLinus Torvalds err = -EINVAL; 1971da177e4SLinus Torvalds if (sock->state != SS_UNCONNECTED || sock->type != SOCK_STREAM) 1981da177e4SLinus Torvalds goto out; 1991da177e4SLinus Torvalds 2001da177e4SLinus Torvalds old_state = sk->sk_state; 2011da177e4SLinus Torvalds if (!((1 << old_state) & (TCPF_CLOSE | TCPF_LISTEN))) 2021da177e4SLinus Torvalds goto out; 2031da177e4SLinus Torvalds 2041da177e4SLinus Torvalds /* Really, if the socket is already in listen state 2051da177e4SLinus Torvalds * we can only allow the backlog to be adjusted. 2061da177e4SLinus Torvalds */ 2071da177e4SLinus Torvalds if (old_state != TCP_LISTEN) { 20872a3effaSEric Dumazet err = inet_csk_listen_start(sk, backlog); 2091da177e4SLinus Torvalds if (err) 2101da177e4SLinus Torvalds goto out; 2111da177e4SLinus Torvalds } 2121da177e4SLinus Torvalds sk->sk_max_ack_backlog = backlog; 2131da177e4SLinus Torvalds err = 0; 2141da177e4SLinus Torvalds 2151da177e4SLinus Torvalds out: 2161da177e4SLinus Torvalds release_sock(sk); 2171da177e4SLinus Torvalds return err; 2181da177e4SLinus Torvalds } 2191da177e4SLinus Torvalds 2201da177e4SLinus Torvalds /* 2211da177e4SLinus Torvalds * Create an inet socket. 2221da177e4SLinus Torvalds */ 2231da177e4SLinus Torvalds 2241da177e4SLinus Torvalds static int inet_create(struct socket *sock, int protocol) 2251da177e4SLinus Torvalds { 2261da177e4SLinus Torvalds struct sock *sk; 2271da177e4SLinus Torvalds struct list_head *p; 2281da177e4SLinus Torvalds struct inet_protosw *answer; 2291da177e4SLinus Torvalds struct inet_sock *inet; 2301da177e4SLinus Torvalds struct proto *answer_prot; 2311da177e4SLinus Torvalds unsigned char answer_flags; 2321da177e4SLinus Torvalds char answer_no_check; 233bb97d31fSArnaldo Carvalho de Melo int try_loading_module = 0; 23486c8f9d1SHerbert Xu int err; 2351da177e4SLinus Torvalds 2361da177e4SLinus Torvalds sock->state = SS_UNCONNECTED; 2371da177e4SLinus Torvalds 2381da177e4SLinus Torvalds /* Look for the requested type/protocol pair. */ 2391da177e4SLinus Torvalds answer = NULL; 240bb97d31fSArnaldo Carvalho de Melo lookup_protocol: 24186c8f9d1SHerbert Xu err = -ESOCKTNOSUPPORT; 2421da177e4SLinus Torvalds rcu_read_lock(); 2431da177e4SLinus Torvalds list_for_each_rcu(p, &inetsw[sock->type]) { 2441da177e4SLinus Torvalds answer = list_entry(p, struct inet_protosw, list); 2451da177e4SLinus Torvalds 2461da177e4SLinus Torvalds /* Check the non-wild match. */ 2471da177e4SLinus Torvalds if (protocol == answer->protocol) { 2481da177e4SLinus Torvalds if (protocol != IPPROTO_IP) 2491da177e4SLinus Torvalds break; 2501da177e4SLinus Torvalds } else { 2511da177e4SLinus Torvalds /* Check for the two wild cases. */ 2521da177e4SLinus Torvalds if (IPPROTO_IP == protocol) { 2531da177e4SLinus Torvalds protocol = answer->protocol; 2541da177e4SLinus Torvalds break; 2551da177e4SLinus Torvalds } 2561da177e4SLinus Torvalds if (IPPROTO_IP == answer->protocol) 2571da177e4SLinus Torvalds break; 2581da177e4SLinus Torvalds } 25986c8f9d1SHerbert Xu err = -EPROTONOSUPPORT; 2601da177e4SLinus Torvalds answer = NULL; 2611da177e4SLinus Torvalds } 2621da177e4SLinus Torvalds 263bb97d31fSArnaldo Carvalho de Melo if (unlikely(answer == NULL)) { 264bb97d31fSArnaldo Carvalho de Melo if (try_loading_module < 2) { 265bb97d31fSArnaldo Carvalho de Melo rcu_read_unlock(); 266bb97d31fSArnaldo Carvalho de Melo /* 267bb97d31fSArnaldo Carvalho de Melo * Be more specific, e.g. net-pf-2-proto-132-type-1 268bb97d31fSArnaldo Carvalho de Melo * (net-pf-PF_INET-proto-IPPROTO_SCTP-type-SOCK_STREAM) 269bb97d31fSArnaldo Carvalho de Melo */ 270bb97d31fSArnaldo Carvalho de Melo if (++try_loading_module == 1) 271bb97d31fSArnaldo Carvalho de Melo request_module("net-pf-%d-proto-%d-type-%d", 272bb97d31fSArnaldo Carvalho de Melo PF_INET, protocol, sock->type); 273bb97d31fSArnaldo Carvalho de Melo /* 274bb97d31fSArnaldo Carvalho de Melo * Fall back to generic, e.g. net-pf-2-proto-132 275bb97d31fSArnaldo Carvalho de Melo * (net-pf-PF_INET-proto-IPPROTO_SCTP) 276bb97d31fSArnaldo Carvalho de Melo */ 277bb97d31fSArnaldo Carvalho de Melo else 278bb97d31fSArnaldo Carvalho de Melo request_module("net-pf-%d-proto-%d", 279bb97d31fSArnaldo Carvalho de Melo PF_INET, protocol); 280bb97d31fSArnaldo Carvalho de Melo goto lookup_protocol; 281bb97d31fSArnaldo Carvalho de Melo } else 2821da177e4SLinus Torvalds goto out_rcu_unlock; 283bb97d31fSArnaldo Carvalho de Melo } 284bb97d31fSArnaldo Carvalho de Melo 2851da177e4SLinus Torvalds err = -EPERM; 2861da177e4SLinus Torvalds if (answer->capability > 0 && !capable(answer->capability)) 2871da177e4SLinus Torvalds goto out_rcu_unlock; 2881da177e4SLinus Torvalds 2891da177e4SLinus Torvalds sock->ops = answer->ops; 2901da177e4SLinus Torvalds answer_prot = answer->prot; 2911da177e4SLinus Torvalds answer_no_check = answer->no_check; 2921da177e4SLinus Torvalds answer_flags = answer->flags; 2931da177e4SLinus Torvalds rcu_read_unlock(); 2941da177e4SLinus Torvalds 2951da177e4SLinus Torvalds BUG_TRAP(answer_prot->slab != NULL); 2961da177e4SLinus Torvalds 2971da177e4SLinus Torvalds err = -ENOBUFS; 2981da177e4SLinus Torvalds sk = sk_alloc(PF_INET, GFP_KERNEL, answer_prot, 1); 2991da177e4SLinus Torvalds if (sk == NULL) 3001da177e4SLinus Torvalds goto out; 3011da177e4SLinus Torvalds 3021da177e4SLinus Torvalds err = 0; 3031da177e4SLinus Torvalds sk->sk_no_check = answer_no_check; 3041da177e4SLinus Torvalds if (INET_PROTOSW_REUSE & answer_flags) 3051da177e4SLinus Torvalds sk->sk_reuse = 1; 3061da177e4SLinus Torvalds 3071da177e4SLinus Torvalds inet = inet_sk(sk); 308469de9b9SPaul Moore inet->is_icsk = (INET_PROTOSW_ICSK & answer_flags) != 0; 3091da177e4SLinus Torvalds 3101da177e4SLinus Torvalds if (SOCK_RAW == sock->type) { 3111da177e4SLinus Torvalds inet->num = protocol; 3121da177e4SLinus Torvalds if (IPPROTO_RAW == protocol) 3131da177e4SLinus Torvalds inet->hdrincl = 1; 3141da177e4SLinus Torvalds } 3151da177e4SLinus Torvalds 3161da177e4SLinus Torvalds if (ipv4_config.no_pmtu_disc) 3171da177e4SLinus Torvalds inet->pmtudisc = IP_PMTUDISC_DONT; 3181da177e4SLinus Torvalds else 3191da177e4SLinus Torvalds inet->pmtudisc = IP_PMTUDISC_WANT; 3201da177e4SLinus Torvalds 3211da177e4SLinus Torvalds inet->id = 0; 3221da177e4SLinus Torvalds 3231da177e4SLinus Torvalds sock_init_data(sock, sk); 3241da177e4SLinus Torvalds 3251da177e4SLinus Torvalds sk->sk_destruct = inet_sock_destruct; 3261da177e4SLinus Torvalds sk->sk_family = PF_INET; 3271da177e4SLinus Torvalds sk->sk_protocol = protocol; 3281da177e4SLinus Torvalds sk->sk_backlog_rcv = sk->sk_prot->backlog_rcv; 3291da177e4SLinus Torvalds 3301da177e4SLinus Torvalds inet->uc_ttl = -1; 3311da177e4SLinus Torvalds inet->mc_loop = 1; 3321da177e4SLinus Torvalds inet->mc_ttl = 1; 3331da177e4SLinus Torvalds inet->mc_index = 0; 3341da177e4SLinus Torvalds inet->mc_list = NULL; 3351da177e4SLinus Torvalds 336e6848976SArnaldo Carvalho de Melo sk_refcnt_debug_inc(sk); 3371da177e4SLinus Torvalds 3381da177e4SLinus Torvalds if (inet->num) { 3391da177e4SLinus Torvalds /* It assumes that any protocol which allows 3401da177e4SLinus Torvalds * the user to assign a number at socket 3411da177e4SLinus Torvalds * creation time automatically 3421da177e4SLinus Torvalds * shares. 3431da177e4SLinus Torvalds */ 3441da177e4SLinus Torvalds inet->sport = htons(inet->num); 3451da177e4SLinus Torvalds /* Add to protocol hash chains. */ 3461da177e4SLinus Torvalds sk->sk_prot->hash(sk); 3471da177e4SLinus Torvalds } 3481da177e4SLinus Torvalds 3491da177e4SLinus Torvalds if (sk->sk_prot->init) { 3501da177e4SLinus Torvalds err = sk->sk_prot->init(sk); 3511da177e4SLinus Torvalds if (err) 3521da177e4SLinus Torvalds sk_common_release(sk); 3531da177e4SLinus Torvalds } 3541da177e4SLinus Torvalds out: 3551da177e4SLinus Torvalds return err; 3561da177e4SLinus Torvalds out_rcu_unlock: 3571da177e4SLinus Torvalds rcu_read_unlock(); 3581da177e4SLinus Torvalds goto out; 3591da177e4SLinus Torvalds } 3601da177e4SLinus Torvalds 3611da177e4SLinus Torvalds 3621da177e4SLinus Torvalds /* 3631da177e4SLinus Torvalds * The peer socket should always be NULL (or else). When we call this 3641da177e4SLinus Torvalds * function we are destroying the object and from then on nobody 3651da177e4SLinus Torvalds * should refer to it. 3661da177e4SLinus Torvalds */ 3671da177e4SLinus Torvalds int inet_release(struct socket *sock) 3681da177e4SLinus Torvalds { 3691da177e4SLinus Torvalds struct sock *sk = sock->sk; 3701da177e4SLinus Torvalds 3711da177e4SLinus Torvalds if (sk) { 3721da177e4SLinus Torvalds long timeout; 3731da177e4SLinus Torvalds 3741da177e4SLinus Torvalds /* Applications forget to leave groups before exiting */ 3751da177e4SLinus Torvalds ip_mc_drop_socket(sk); 3761da177e4SLinus Torvalds 3771da177e4SLinus Torvalds /* If linger is set, we don't return until the close 3781da177e4SLinus Torvalds * is complete. Otherwise we return immediately. The 3791da177e4SLinus Torvalds * actually closing is done the same either way. 3801da177e4SLinus Torvalds * 3811da177e4SLinus Torvalds * If the close is due to the process exiting, we never 3821da177e4SLinus Torvalds * linger.. 3831da177e4SLinus Torvalds */ 3841da177e4SLinus Torvalds timeout = 0; 3851da177e4SLinus Torvalds if (sock_flag(sk, SOCK_LINGER) && 3861da177e4SLinus Torvalds !(current->flags & PF_EXITING)) 3871da177e4SLinus Torvalds timeout = sk->sk_lingertime; 3881da177e4SLinus Torvalds sock->sk = NULL; 3891da177e4SLinus Torvalds sk->sk_prot->close(sk, timeout); 3901da177e4SLinus Torvalds } 3911da177e4SLinus Torvalds return 0; 3921da177e4SLinus Torvalds } 3931da177e4SLinus Torvalds 3941da177e4SLinus Torvalds /* It is off by default, see below. */ 395ab32ea5dSBrian Haley int sysctl_ip_nonlocal_bind __read_mostly; 3961da177e4SLinus Torvalds 3971da177e4SLinus Torvalds int inet_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len) 3981da177e4SLinus Torvalds { 3991da177e4SLinus Torvalds struct sockaddr_in *addr = (struct sockaddr_in *)uaddr; 4001da177e4SLinus Torvalds struct sock *sk = sock->sk; 4011da177e4SLinus Torvalds struct inet_sock *inet = inet_sk(sk); 4021da177e4SLinus Torvalds unsigned short snum; 4031da177e4SLinus Torvalds int chk_addr_ret; 4041da177e4SLinus Torvalds int err; 4051da177e4SLinus Torvalds 4061da177e4SLinus Torvalds /* If the socket has its own bind function then use it. (RAW) */ 4071da177e4SLinus Torvalds if (sk->sk_prot->bind) { 4081da177e4SLinus Torvalds err = sk->sk_prot->bind(sk, uaddr, addr_len); 4091da177e4SLinus Torvalds goto out; 4101da177e4SLinus Torvalds } 4111da177e4SLinus Torvalds err = -EINVAL; 4121da177e4SLinus Torvalds if (addr_len < sizeof(struct sockaddr_in)) 4131da177e4SLinus Torvalds goto out; 4141da177e4SLinus Torvalds 4151da177e4SLinus Torvalds chk_addr_ret = inet_addr_type(addr->sin_addr.s_addr); 4161da177e4SLinus Torvalds 4171da177e4SLinus Torvalds /* Not specified by any standard per-se, however it breaks too 4181da177e4SLinus Torvalds * many applications when removed. It is unfortunate since 4191da177e4SLinus Torvalds * allowing applications to make a non-local bind solves 4201da177e4SLinus Torvalds * several problems with systems using dynamic addressing. 4211da177e4SLinus Torvalds * (ie. your servers still start up even if your ISDN link 4221da177e4SLinus Torvalds * is temporarily down) 4231da177e4SLinus Torvalds */ 4241da177e4SLinus Torvalds err = -EADDRNOTAVAIL; 4251da177e4SLinus Torvalds if (!sysctl_ip_nonlocal_bind && 4261da177e4SLinus Torvalds !inet->freebind && 4271da177e4SLinus Torvalds addr->sin_addr.s_addr != INADDR_ANY && 4281da177e4SLinus Torvalds chk_addr_ret != RTN_LOCAL && 4291da177e4SLinus Torvalds chk_addr_ret != RTN_MULTICAST && 4301da177e4SLinus Torvalds chk_addr_ret != RTN_BROADCAST) 4311da177e4SLinus Torvalds goto out; 4321da177e4SLinus Torvalds 4331da177e4SLinus Torvalds snum = ntohs(addr->sin_port); 4341da177e4SLinus Torvalds err = -EACCES; 4351da177e4SLinus Torvalds if (snum && snum < PROT_SOCK && !capable(CAP_NET_BIND_SERVICE)) 4361da177e4SLinus Torvalds goto out; 4371da177e4SLinus Torvalds 4381da177e4SLinus Torvalds /* We keep a pair of addresses. rcv_saddr is the one 4391da177e4SLinus Torvalds * used by hash lookups, and saddr is used for transmit. 4401da177e4SLinus Torvalds * 4411da177e4SLinus Torvalds * In the BSD API these are the same except where it 4421da177e4SLinus Torvalds * would be illegal to use them (multicast/broadcast) in 4431da177e4SLinus Torvalds * which case the sending device address is used. 4441da177e4SLinus Torvalds */ 4451da177e4SLinus Torvalds lock_sock(sk); 4461da177e4SLinus Torvalds 4471da177e4SLinus Torvalds /* Check these errors (active socket, double bind). */ 4481da177e4SLinus Torvalds err = -EINVAL; 4491da177e4SLinus Torvalds if (sk->sk_state != TCP_CLOSE || inet->num) 4501da177e4SLinus Torvalds goto out_release_sock; 4511da177e4SLinus Torvalds 4521da177e4SLinus Torvalds inet->rcv_saddr = inet->saddr = addr->sin_addr.s_addr; 4531da177e4SLinus Torvalds if (chk_addr_ret == RTN_MULTICAST || chk_addr_ret == RTN_BROADCAST) 4541da177e4SLinus Torvalds inet->saddr = 0; /* Use device */ 4551da177e4SLinus Torvalds 4561da177e4SLinus Torvalds /* Make sure we are allowed to bind here. */ 4571da177e4SLinus Torvalds if (sk->sk_prot->get_port(sk, snum)) { 4581da177e4SLinus Torvalds inet->saddr = inet->rcv_saddr = 0; 4591da177e4SLinus Torvalds err = -EADDRINUSE; 4601da177e4SLinus Torvalds goto out_release_sock; 4611da177e4SLinus Torvalds } 4621da177e4SLinus Torvalds 4631da177e4SLinus Torvalds if (inet->rcv_saddr) 4641da177e4SLinus Torvalds sk->sk_userlocks |= SOCK_BINDADDR_LOCK; 4651da177e4SLinus Torvalds if (snum) 4661da177e4SLinus Torvalds sk->sk_userlocks |= SOCK_BINDPORT_LOCK; 4671da177e4SLinus Torvalds inet->sport = htons(inet->num); 4681da177e4SLinus Torvalds inet->daddr = 0; 4691da177e4SLinus Torvalds inet->dport = 0; 4701da177e4SLinus Torvalds sk_dst_reset(sk); 4711da177e4SLinus Torvalds err = 0; 4721da177e4SLinus Torvalds out_release_sock: 4731da177e4SLinus Torvalds release_sock(sk); 4741da177e4SLinus Torvalds out: 4751da177e4SLinus Torvalds return err; 4761da177e4SLinus Torvalds } 4771da177e4SLinus Torvalds 4781da177e4SLinus Torvalds int inet_dgram_connect(struct socket *sock, struct sockaddr * uaddr, 4791da177e4SLinus Torvalds int addr_len, int flags) 4801da177e4SLinus Torvalds { 4811da177e4SLinus Torvalds struct sock *sk = sock->sk; 4821da177e4SLinus Torvalds 4831da177e4SLinus Torvalds if (uaddr->sa_family == AF_UNSPEC) 4841da177e4SLinus Torvalds return sk->sk_prot->disconnect(sk, flags); 4851da177e4SLinus Torvalds 4861da177e4SLinus Torvalds if (!inet_sk(sk)->num && inet_autobind(sk)) 4871da177e4SLinus Torvalds return -EAGAIN; 4881da177e4SLinus Torvalds return sk->sk_prot->connect(sk, (struct sockaddr *)uaddr, addr_len); 4891da177e4SLinus Torvalds } 4901da177e4SLinus Torvalds 4911da177e4SLinus Torvalds static long inet_wait_for_connect(struct sock *sk, long timeo) 4921da177e4SLinus Torvalds { 4931da177e4SLinus Torvalds DEFINE_WAIT(wait); 4941da177e4SLinus Torvalds 4951da177e4SLinus Torvalds prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE); 4961da177e4SLinus Torvalds 4971da177e4SLinus Torvalds /* Basic assumption: if someone sets sk->sk_err, he _must_ 4981da177e4SLinus Torvalds * change state of the socket from TCP_SYN_*. 4991da177e4SLinus Torvalds * Connect() does not allow to get error notifications 5001da177e4SLinus Torvalds * without closing the socket. 5011da177e4SLinus Torvalds */ 5021da177e4SLinus Torvalds while ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV)) { 5031da177e4SLinus Torvalds release_sock(sk); 5041da177e4SLinus Torvalds timeo = schedule_timeout(timeo); 5051da177e4SLinus Torvalds lock_sock(sk); 5061da177e4SLinus Torvalds if (signal_pending(current) || !timeo) 5071da177e4SLinus Torvalds break; 5081da177e4SLinus Torvalds prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE); 5091da177e4SLinus Torvalds } 5101da177e4SLinus Torvalds finish_wait(sk->sk_sleep, &wait); 5111da177e4SLinus Torvalds return timeo; 5121da177e4SLinus Torvalds } 5131da177e4SLinus Torvalds 5141da177e4SLinus Torvalds /* 5151da177e4SLinus Torvalds * Connect to a remote host. There is regrettably still a little 5161da177e4SLinus Torvalds * TCP 'magic' in here. 5171da177e4SLinus Torvalds */ 5181da177e4SLinus Torvalds int inet_stream_connect(struct socket *sock, struct sockaddr *uaddr, 5191da177e4SLinus Torvalds int addr_len, int flags) 5201da177e4SLinus Torvalds { 5211da177e4SLinus Torvalds struct sock *sk = sock->sk; 5221da177e4SLinus Torvalds int err; 5231da177e4SLinus Torvalds long timeo; 5241da177e4SLinus Torvalds 5251da177e4SLinus Torvalds lock_sock(sk); 5261da177e4SLinus Torvalds 5271da177e4SLinus Torvalds if (uaddr->sa_family == AF_UNSPEC) { 5281da177e4SLinus Torvalds err = sk->sk_prot->disconnect(sk, flags); 5291da177e4SLinus Torvalds sock->state = err ? SS_DISCONNECTING : SS_UNCONNECTED; 5301da177e4SLinus Torvalds goto out; 5311da177e4SLinus Torvalds } 5321da177e4SLinus Torvalds 5331da177e4SLinus Torvalds switch (sock->state) { 5341da177e4SLinus Torvalds default: 5351da177e4SLinus Torvalds err = -EINVAL; 5361da177e4SLinus Torvalds goto out; 5371da177e4SLinus Torvalds case SS_CONNECTED: 5381da177e4SLinus Torvalds err = -EISCONN; 5391da177e4SLinus Torvalds goto out; 5401da177e4SLinus Torvalds case SS_CONNECTING: 5411da177e4SLinus Torvalds err = -EALREADY; 5421da177e4SLinus Torvalds /* Fall out of switch with err, set for this state */ 5431da177e4SLinus Torvalds break; 5441da177e4SLinus Torvalds case SS_UNCONNECTED: 5451da177e4SLinus Torvalds err = -EISCONN; 5461da177e4SLinus Torvalds if (sk->sk_state != TCP_CLOSE) 5471da177e4SLinus Torvalds goto out; 5481da177e4SLinus Torvalds 5491da177e4SLinus Torvalds err = sk->sk_prot->connect(sk, uaddr, addr_len); 5501da177e4SLinus Torvalds if (err < 0) 5511da177e4SLinus Torvalds goto out; 5521da177e4SLinus Torvalds 5531da177e4SLinus Torvalds sock->state = SS_CONNECTING; 5541da177e4SLinus Torvalds 5551da177e4SLinus Torvalds /* Just entered SS_CONNECTING state; the only 5561da177e4SLinus Torvalds * difference is that return value in non-blocking 5571da177e4SLinus Torvalds * case is EINPROGRESS, rather than EALREADY. 5581da177e4SLinus Torvalds */ 5591da177e4SLinus Torvalds err = -EINPROGRESS; 5601da177e4SLinus Torvalds break; 5611da177e4SLinus Torvalds } 5621da177e4SLinus Torvalds 5631da177e4SLinus Torvalds timeo = sock_sndtimeo(sk, flags & O_NONBLOCK); 5641da177e4SLinus Torvalds 5651da177e4SLinus Torvalds if ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV)) { 5661da177e4SLinus Torvalds /* Error code is set above */ 5671da177e4SLinus Torvalds if (!timeo || !inet_wait_for_connect(sk, timeo)) 5681da177e4SLinus Torvalds goto out; 5691da177e4SLinus Torvalds 5701da177e4SLinus Torvalds err = sock_intr_errno(timeo); 5711da177e4SLinus Torvalds if (signal_pending(current)) 5721da177e4SLinus Torvalds goto out; 5731da177e4SLinus Torvalds } 5741da177e4SLinus Torvalds 5751da177e4SLinus Torvalds /* Connection was closed by RST, timeout, ICMP error 5761da177e4SLinus Torvalds * or another process disconnected us. 5771da177e4SLinus Torvalds */ 5781da177e4SLinus Torvalds if (sk->sk_state == TCP_CLOSE) 5791da177e4SLinus Torvalds goto sock_error; 5801da177e4SLinus Torvalds 5811da177e4SLinus Torvalds /* sk->sk_err may be not zero now, if RECVERR was ordered by user 5821da177e4SLinus Torvalds * and error was received after socket entered established state. 5831da177e4SLinus Torvalds * Hence, it is handled normally after connect() return successfully. 5841da177e4SLinus Torvalds */ 5851da177e4SLinus Torvalds 5861da177e4SLinus Torvalds sock->state = SS_CONNECTED; 5871da177e4SLinus Torvalds err = 0; 5881da177e4SLinus Torvalds out: 5891da177e4SLinus Torvalds release_sock(sk); 5901da177e4SLinus Torvalds return err; 5911da177e4SLinus Torvalds 5921da177e4SLinus Torvalds sock_error: 5931da177e4SLinus Torvalds err = sock_error(sk) ? : -ECONNABORTED; 5941da177e4SLinus Torvalds sock->state = SS_UNCONNECTED; 5951da177e4SLinus Torvalds if (sk->sk_prot->disconnect(sk, flags)) 5961da177e4SLinus Torvalds sock->state = SS_DISCONNECTING; 5971da177e4SLinus Torvalds goto out; 5981da177e4SLinus Torvalds } 5991da177e4SLinus Torvalds 6001da177e4SLinus Torvalds /* 6011da177e4SLinus Torvalds * Accept a pending connection. The TCP layer now gives BSD semantics. 6021da177e4SLinus Torvalds */ 6031da177e4SLinus Torvalds 6041da177e4SLinus Torvalds int inet_accept(struct socket *sock, struct socket *newsock, int flags) 6051da177e4SLinus Torvalds { 6061da177e4SLinus Torvalds struct sock *sk1 = sock->sk; 6071da177e4SLinus Torvalds int err = -EINVAL; 6081da177e4SLinus Torvalds struct sock *sk2 = sk1->sk_prot->accept(sk1, flags, &err); 6091da177e4SLinus Torvalds 6101da177e4SLinus Torvalds if (!sk2) 6111da177e4SLinus Torvalds goto do_err; 6121da177e4SLinus Torvalds 6131da177e4SLinus Torvalds lock_sock(sk2); 6141da177e4SLinus Torvalds 6151da177e4SLinus Torvalds BUG_TRAP((1 << sk2->sk_state) & 6161da177e4SLinus Torvalds (TCPF_ESTABLISHED | TCPF_CLOSE_WAIT | TCPF_CLOSE)); 6171da177e4SLinus Torvalds 6181da177e4SLinus Torvalds sock_graft(sk2, newsock); 6191da177e4SLinus Torvalds 6201da177e4SLinus Torvalds newsock->state = SS_CONNECTED; 6211da177e4SLinus Torvalds err = 0; 6221da177e4SLinus Torvalds release_sock(sk2); 6231da177e4SLinus Torvalds do_err: 6241da177e4SLinus Torvalds return err; 6251da177e4SLinus Torvalds } 6261da177e4SLinus Torvalds 6271da177e4SLinus Torvalds 6281da177e4SLinus Torvalds /* 6291da177e4SLinus Torvalds * This does both peername and sockname. 6301da177e4SLinus Torvalds */ 6311da177e4SLinus Torvalds int inet_getname(struct socket *sock, struct sockaddr *uaddr, 6321da177e4SLinus Torvalds int *uaddr_len, int peer) 6331da177e4SLinus Torvalds { 6341da177e4SLinus Torvalds struct sock *sk = sock->sk; 6351da177e4SLinus Torvalds struct inet_sock *inet = inet_sk(sk); 6361da177e4SLinus Torvalds struct sockaddr_in *sin = (struct sockaddr_in *)uaddr; 6371da177e4SLinus Torvalds 6381da177e4SLinus Torvalds sin->sin_family = AF_INET; 6391da177e4SLinus Torvalds if (peer) { 6401da177e4SLinus Torvalds if (!inet->dport || 6411da177e4SLinus Torvalds (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) && 6421da177e4SLinus Torvalds peer == 1)) 6431da177e4SLinus Torvalds return -ENOTCONN; 6441da177e4SLinus Torvalds sin->sin_port = inet->dport; 6451da177e4SLinus Torvalds sin->sin_addr.s_addr = inet->daddr; 6461da177e4SLinus Torvalds } else { 647714e85beSAl Viro __be32 addr = inet->rcv_saddr; 6481da177e4SLinus Torvalds if (!addr) 6491da177e4SLinus Torvalds addr = inet->saddr; 6501da177e4SLinus Torvalds sin->sin_port = inet->sport; 6511da177e4SLinus Torvalds sin->sin_addr.s_addr = addr; 6521da177e4SLinus Torvalds } 6531da177e4SLinus Torvalds memset(sin->sin_zero, 0, sizeof(sin->sin_zero)); 6541da177e4SLinus Torvalds *uaddr_len = sizeof(*sin); 6551da177e4SLinus Torvalds return 0; 6561da177e4SLinus Torvalds } 6571da177e4SLinus Torvalds 6581da177e4SLinus Torvalds int inet_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg, 6591da177e4SLinus Torvalds size_t size) 6601da177e4SLinus Torvalds { 6611da177e4SLinus Torvalds struct sock *sk = sock->sk; 6621da177e4SLinus Torvalds 6631da177e4SLinus Torvalds /* We may need to bind the socket. */ 6641da177e4SLinus Torvalds if (!inet_sk(sk)->num && inet_autobind(sk)) 6651da177e4SLinus Torvalds return -EAGAIN; 6661da177e4SLinus Torvalds 6671da177e4SLinus Torvalds return sk->sk_prot->sendmsg(iocb, sk, msg, size); 6681da177e4SLinus Torvalds } 6691da177e4SLinus Torvalds 6701da177e4SLinus Torvalds 6711da177e4SLinus Torvalds static ssize_t inet_sendpage(struct socket *sock, struct page *page, int offset, size_t size, int flags) 6721da177e4SLinus Torvalds { 6731da177e4SLinus Torvalds struct sock *sk = sock->sk; 6741da177e4SLinus Torvalds 6751da177e4SLinus Torvalds /* We may need to bind the socket. */ 6761da177e4SLinus Torvalds if (!inet_sk(sk)->num && inet_autobind(sk)) 6771da177e4SLinus Torvalds return -EAGAIN; 6781da177e4SLinus Torvalds 6791da177e4SLinus Torvalds if (sk->sk_prot->sendpage) 6801da177e4SLinus Torvalds return sk->sk_prot->sendpage(sk, page, offset, size, flags); 6811da177e4SLinus Torvalds return sock_no_sendpage(sock, page, offset, size, flags); 6821da177e4SLinus Torvalds } 6831da177e4SLinus Torvalds 6841da177e4SLinus Torvalds 6851da177e4SLinus Torvalds int inet_shutdown(struct socket *sock, int how) 6861da177e4SLinus Torvalds { 6871da177e4SLinus Torvalds struct sock *sk = sock->sk; 6881da177e4SLinus Torvalds int err = 0; 6891da177e4SLinus Torvalds 6901da177e4SLinus Torvalds /* This should really check to make sure 6911da177e4SLinus Torvalds * the socket is a TCP socket. (WHY AC...) 6921da177e4SLinus Torvalds */ 6931da177e4SLinus Torvalds how++; /* maps 0->1 has the advantage of making bit 1 rcvs and 6941da177e4SLinus Torvalds 1->2 bit 2 snds. 6951da177e4SLinus Torvalds 2->3 */ 6961da177e4SLinus Torvalds if ((how & ~SHUTDOWN_MASK) || !how) /* MAXINT->0 */ 6971da177e4SLinus Torvalds return -EINVAL; 6981da177e4SLinus Torvalds 6991da177e4SLinus Torvalds lock_sock(sk); 7001da177e4SLinus Torvalds if (sock->state == SS_CONNECTING) { 7011da177e4SLinus Torvalds if ((1 << sk->sk_state) & 7021da177e4SLinus Torvalds (TCPF_SYN_SENT | TCPF_SYN_RECV | TCPF_CLOSE)) 7031da177e4SLinus Torvalds sock->state = SS_DISCONNECTING; 7041da177e4SLinus Torvalds else 7051da177e4SLinus Torvalds sock->state = SS_CONNECTED; 7061da177e4SLinus Torvalds } 7071da177e4SLinus Torvalds 7081da177e4SLinus Torvalds switch (sk->sk_state) { 7091da177e4SLinus Torvalds case TCP_CLOSE: 7101da177e4SLinus Torvalds err = -ENOTCONN; 7111da177e4SLinus Torvalds /* Hack to wake up other listeners, who can poll for 7121da177e4SLinus Torvalds POLLHUP, even on eg. unconnected UDP sockets -- RR */ 7131da177e4SLinus Torvalds default: 7141da177e4SLinus Torvalds sk->sk_shutdown |= how; 7151da177e4SLinus Torvalds if (sk->sk_prot->shutdown) 7161da177e4SLinus Torvalds sk->sk_prot->shutdown(sk, how); 7171da177e4SLinus Torvalds break; 7181da177e4SLinus Torvalds 7191da177e4SLinus Torvalds /* Remaining two branches are temporary solution for missing 7201da177e4SLinus Torvalds * close() in multithreaded environment. It is _not_ a good idea, 7211da177e4SLinus Torvalds * but we have no choice until close() is repaired at VFS level. 7221da177e4SLinus Torvalds */ 7231da177e4SLinus Torvalds case TCP_LISTEN: 7241da177e4SLinus Torvalds if (!(how & RCV_SHUTDOWN)) 7251da177e4SLinus Torvalds break; 7261da177e4SLinus Torvalds /* Fall through */ 7271da177e4SLinus Torvalds case TCP_SYN_SENT: 7281da177e4SLinus Torvalds err = sk->sk_prot->disconnect(sk, O_NONBLOCK); 7291da177e4SLinus Torvalds sock->state = err ? SS_DISCONNECTING : SS_UNCONNECTED; 7301da177e4SLinus Torvalds break; 7311da177e4SLinus Torvalds } 7321da177e4SLinus Torvalds 7331da177e4SLinus Torvalds /* Wake up anyone sleeping in poll. */ 7341da177e4SLinus Torvalds sk->sk_state_change(sk); 7351da177e4SLinus Torvalds release_sock(sk); 7361da177e4SLinus Torvalds return err; 7371da177e4SLinus Torvalds } 7381da177e4SLinus Torvalds 7391da177e4SLinus Torvalds /* 7401da177e4SLinus Torvalds * ioctl() calls you can issue on an INET socket. Most of these are 7411da177e4SLinus Torvalds * device configuration and stuff and very rarely used. Some ioctls 7421da177e4SLinus Torvalds * pass on to the socket itself. 7431da177e4SLinus Torvalds * 7441da177e4SLinus Torvalds * NOTE: I like the idea of a module for the config stuff. ie ifconfig 7451da177e4SLinus Torvalds * loads the devconfigure module does its configuring and unloads it. 7461da177e4SLinus Torvalds * There's a good 20K of config code hanging around the kernel. 7471da177e4SLinus Torvalds */ 7481da177e4SLinus Torvalds 7491da177e4SLinus Torvalds int inet_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 7501da177e4SLinus Torvalds { 7511da177e4SLinus Torvalds struct sock *sk = sock->sk; 7521da177e4SLinus Torvalds int err = 0; 7531da177e4SLinus Torvalds 7541da177e4SLinus Torvalds switch (cmd) { 7551da177e4SLinus Torvalds case SIOCGSTAMP: 7561da177e4SLinus Torvalds err = sock_get_timestamp(sk, (struct timeval __user *)arg); 7571da177e4SLinus Torvalds break; 7581da177e4SLinus Torvalds case SIOCADDRT: 7591da177e4SLinus Torvalds case SIOCDELRT: 7601da177e4SLinus Torvalds case SIOCRTMSG: 7611da177e4SLinus Torvalds err = ip_rt_ioctl(cmd, (void __user *)arg); 7621da177e4SLinus Torvalds break; 7631da177e4SLinus Torvalds case SIOCDARP: 7641da177e4SLinus Torvalds case SIOCGARP: 7651da177e4SLinus Torvalds case SIOCSARP: 7661da177e4SLinus Torvalds err = arp_ioctl(cmd, (void __user *)arg); 7671da177e4SLinus Torvalds break; 7681da177e4SLinus Torvalds case SIOCGIFADDR: 7691da177e4SLinus Torvalds case SIOCSIFADDR: 7701da177e4SLinus Torvalds case SIOCGIFBRDADDR: 7711da177e4SLinus Torvalds case SIOCSIFBRDADDR: 7721da177e4SLinus Torvalds case SIOCGIFNETMASK: 7731da177e4SLinus Torvalds case SIOCSIFNETMASK: 7741da177e4SLinus Torvalds case SIOCGIFDSTADDR: 7751da177e4SLinus Torvalds case SIOCSIFDSTADDR: 7761da177e4SLinus Torvalds case SIOCSIFPFLAGS: 7771da177e4SLinus Torvalds case SIOCGIFPFLAGS: 7781da177e4SLinus Torvalds case SIOCSIFFLAGS: 7791da177e4SLinus Torvalds err = devinet_ioctl(cmd, (void __user *)arg); 7801da177e4SLinus Torvalds break; 7811da177e4SLinus Torvalds default: 782b5e5fa5eSChristoph Hellwig if (sk->sk_prot->ioctl) 783b5e5fa5eSChristoph Hellwig err = sk->sk_prot->ioctl(sk, cmd, arg); 784b5e5fa5eSChristoph Hellwig else 785b5e5fa5eSChristoph Hellwig err = -ENOIOCTLCMD; 7861da177e4SLinus Torvalds break; 7871da177e4SLinus Torvalds } 7881da177e4SLinus Torvalds return err; 7891da177e4SLinus Torvalds } 7901da177e4SLinus Torvalds 79190ddc4f0SEric Dumazet const struct proto_ops inet_stream_ops = { 7921da177e4SLinus Torvalds .family = PF_INET, 7931da177e4SLinus Torvalds .owner = THIS_MODULE, 7941da177e4SLinus Torvalds .release = inet_release, 7951da177e4SLinus Torvalds .bind = inet_bind, 7961da177e4SLinus Torvalds .connect = inet_stream_connect, 7971da177e4SLinus Torvalds .socketpair = sock_no_socketpair, 7981da177e4SLinus Torvalds .accept = inet_accept, 7991da177e4SLinus Torvalds .getname = inet_getname, 8001da177e4SLinus Torvalds .poll = tcp_poll, 8011da177e4SLinus Torvalds .ioctl = inet_ioctl, 8021da177e4SLinus Torvalds .listen = inet_listen, 8031da177e4SLinus Torvalds .shutdown = inet_shutdown, 8041da177e4SLinus Torvalds .setsockopt = sock_common_setsockopt, 8051da177e4SLinus Torvalds .getsockopt = sock_common_getsockopt, 806543d9cfeSArnaldo Carvalho de Melo .sendmsg = inet_sendmsg, 807543d9cfeSArnaldo Carvalho de Melo .recvmsg = sock_common_recvmsg, 808543d9cfeSArnaldo Carvalho de Melo .mmap = sock_no_mmap, 809543d9cfeSArnaldo Carvalho de Melo .sendpage = tcp_sendpage, 8103fdadf7dSDmitry Mishin #ifdef CONFIG_COMPAT 8113fdadf7dSDmitry Mishin .compat_setsockopt = compat_sock_common_setsockopt, 8123fdadf7dSDmitry Mishin .compat_getsockopt = compat_sock_common_getsockopt, 8133fdadf7dSDmitry Mishin #endif 8141da177e4SLinus Torvalds }; 8151da177e4SLinus Torvalds 81690ddc4f0SEric Dumazet const struct proto_ops inet_dgram_ops = { 8171da177e4SLinus Torvalds .family = PF_INET, 8181da177e4SLinus Torvalds .owner = THIS_MODULE, 8191da177e4SLinus Torvalds .release = inet_release, 8201da177e4SLinus Torvalds .bind = inet_bind, 8211da177e4SLinus Torvalds .connect = inet_dgram_connect, 8221da177e4SLinus Torvalds .socketpair = sock_no_socketpair, 8231da177e4SLinus Torvalds .accept = sock_no_accept, 8241da177e4SLinus Torvalds .getname = inet_getname, 8251da177e4SLinus Torvalds .poll = udp_poll, 8261da177e4SLinus Torvalds .ioctl = inet_ioctl, 8271da177e4SLinus Torvalds .listen = sock_no_listen, 8281da177e4SLinus Torvalds .shutdown = inet_shutdown, 8291da177e4SLinus Torvalds .setsockopt = sock_common_setsockopt, 8301da177e4SLinus Torvalds .getsockopt = sock_common_getsockopt, 8311da177e4SLinus Torvalds .sendmsg = inet_sendmsg, 8321da177e4SLinus Torvalds .recvmsg = sock_common_recvmsg, 8331da177e4SLinus Torvalds .mmap = sock_no_mmap, 8341da177e4SLinus Torvalds .sendpage = inet_sendpage, 835543d9cfeSArnaldo Carvalho de Melo #ifdef CONFIG_COMPAT 836543d9cfeSArnaldo Carvalho de Melo .compat_setsockopt = compat_sock_common_setsockopt, 837543d9cfeSArnaldo Carvalho de Melo .compat_getsockopt = compat_sock_common_getsockopt, 838543d9cfeSArnaldo Carvalho de Melo #endif 8391da177e4SLinus Torvalds }; 8401da177e4SLinus Torvalds 8411da177e4SLinus Torvalds /* 8421da177e4SLinus Torvalds * For SOCK_RAW sockets; should be the same as inet_dgram_ops but without 8431da177e4SLinus Torvalds * udp_poll 8441da177e4SLinus Torvalds */ 84590ddc4f0SEric Dumazet static const struct proto_ops inet_sockraw_ops = { 8461da177e4SLinus Torvalds .family = PF_INET, 8471da177e4SLinus Torvalds .owner = THIS_MODULE, 8481da177e4SLinus Torvalds .release = inet_release, 8491da177e4SLinus Torvalds .bind = inet_bind, 8501da177e4SLinus Torvalds .connect = inet_dgram_connect, 8511da177e4SLinus Torvalds .socketpair = sock_no_socketpair, 8521da177e4SLinus Torvalds .accept = sock_no_accept, 8531da177e4SLinus Torvalds .getname = inet_getname, 8541da177e4SLinus Torvalds .poll = datagram_poll, 8551da177e4SLinus Torvalds .ioctl = inet_ioctl, 8561da177e4SLinus Torvalds .listen = sock_no_listen, 8571da177e4SLinus Torvalds .shutdown = inet_shutdown, 8581da177e4SLinus Torvalds .setsockopt = sock_common_setsockopt, 8591da177e4SLinus Torvalds .getsockopt = sock_common_getsockopt, 8601da177e4SLinus Torvalds .sendmsg = inet_sendmsg, 8611da177e4SLinus Torvalds .recvmsg = sock_common_recvmsg, 8621da177e4SLinus Torvalds .mmap = sock_no_mmap, 8631da177e4SLinus Torvalds .sendpage = inet_sendpage, 864543d9cfeSArnaldo Carvalho de Melo #ifdef CONFIG_COMPAT 865543d9cfeSArnaldo Carvalho de Melo .compat_setsockopt = compat_sock_common_setsockopt, 866543d9cfeSArnaldo Carvalho de Melo .compat_getsockopt = compat_sock_common_getsockopt, 867543d9cfeSArnaldo Carvalho de Melo #endif 8681da177e4SLinus Torvalds }; 8691da177e4SLinus Torvalds 8701da177e4SLinus Torvalds static struct net_proto_family inet_family_ops = { 8711da177e4SLinus Torvalds .family = PF_INET, 8721da177e4SLinus Torvalds .create = inet_create, 8731da177e4SLinus Torvalds .owner = THIS_MODULE, 8741da177e4SLinus Torvalds }; 8751da177e4SLinus Torvalds 8761da177e4SLinus Torvalds /* Upon startup we insert all the elements in inetsw_array[] into 8771da177e4SLinus Torvalds * the linked list inetsw. 8781da177e4SLinus Torvalds */ 8791da177e4SLinus Torvalds static struct inet_protosw inetsw_array[] = 8801da177e4SLinus Torvalds { 8811da177e4SLinus Torvalds { 8821da177e4SLinus Torvalds .type = SOCK_STREAM, 8831da177e4SLinus Torvalds .protocol = IPPROTO_TCP, 8841da177e4SLinus Torvalds .prot = &tcp_prot, 8851da177e4SLinus Torvalds .ops = &inet_stream_ops, 8861da177e4SLinus Torvalds .capability = -1, 8871da177e4SLinus Torvalds .no_check = 0, 888d83d8461SArnaldo Carvalho de Melo .flags = INET_PROTOSW_PERMANENT | 889d83d8461SArnaldo Carvalho de Melo INET_PROTOSW_ICSK, 8901da177e4SLinus Torvalds }, 8911da177e4SLinus Torvalds 8921da177e4SLinus Torvalds { 8931da177e4SLinus Torvalds .type = SOCK_DGRAM, 8941da177e4SLinus Torvalds .protocol = IPPROTO_UDP, 8951da177e4SLinus Torvalds .prot = &udp_prot, 8961da177e4SLinus Torvalds .ops = &inet_dgram_ops, 8971da177e4SLinus Torvalds .capability = -1, 8981da177e4SLinus Torvalds .no_check = UDP_CSUM_DEFAULT, 8991da177e4SLinus Torvalds .flags = INET_PROTOSW_PERMANENT, 9001da177e4SLinus Torvalds }, 9011da177e4SLinus Torvalds 9021da177e4SLinus Torvalds 9031da177e4SLinus Torvalds { 9041da177e4SLinus Torvalds .type = SOCK_RAW, 9051da177e4SLinus Torvalds .protocol = IPPROTO_IP, /* wild card */ 9061da177e4SLinus Torvalds .prot = &raw_prot, 9071da177e4SLinus Torvalds .ops = &inet_sockraw_ops, 9081da177e4SLinus Torvalds .capability = CAP_NET_RAW, 9091da177e4SLinus Torvalds .no_check = UDP_CSUM_DEFAULT, 9101da177e4SLinus Torvalds .flags = INET_PROTOSW_REUSE, 9111da177e4SLinus Torvalds } 9121da177e4SLinus Torvalds }; 9131da177e4SLinus Torvalds 9141da177e4SLinus Torvalds #define INETSW_ARRAY_LEN (sizeof(inetsw_array) / sizeof(struct inet_protosw)) 9151da177e4SLinus Torvalds 9161da177e4SLinus Torvalds void inet_register_protosw(struct inet_protosw *p) 9171da177e4SLinus Torvalds { 9181da177e4SLinus Torvalds struct list_head *lh; 9191da177e4SLinus Torvalds struct inet_protosw *answer; 9201da177e4SLinus Torvalds int protocol = p->protocol; 9211da177e4SLinus Torvalds struct list_head *last_perm; 9221da177e4SLinus Torvalds 9231da177e4SLinus Torvalds spin_lock_bh(&inetsw_lock); 9241da177e4SLinus Torvalds 9251da177e4SLinus Torvalds if (p->type >= SOCK_MAX) 9261da177e4SLinus Torvalds goto out_illegal; 9271da177e4SLinus Torvalds 9281da177e4SLinus Torvalds /* If we are trying to override a permanent protocol, bail. */ 9291da177e4SLinus Torvalds answer = NULL; 9301da177e4SLinus Torvalds last_perm = &inetsw[p->type]; 9311da177e4SLinus Torvalds list_for_each(lh, &inetsw[p->type]) { 9321da177e4SLinus Torvalds answer = list_entry(lh, struct inet_protosw, list); 9331da177e4SLinus Torvalds 9341da177e4SLinus Torvalds /* Check only the non-wild match. */ 9351da177e4SLinus Torvalds if (INET_PROTOSW_PERMANENT & answer->flags) { 9361da177e4SLinus Torvalds if (protocol == answer->protocol) 9371da177e4SLinus Torvalds break; 9381da177e4SLinus Torvalds last_perm = lh; 9391da177e4SLinus Torvalds } 9401da177e4SLinus Torvalds 9411da177e4SLinus Torvalds answer = NULL; 9421da177e4SLinus Torvalds } 9431da177e4SLinus Torvalds if (answer) 9441da177e4SLinus Torvalds goto out_permanent; 9451da177e4SLinus Torvalds 9461da177e4SLinus Torvalds /* Add the new entry after the last permanent entry if any, so that 9471da177e4SLinus Torvalds * the new entry does not override a permanent entry when matched with 9481da177e4SLinus Torvalds * a wild-card protocol. But it is allowed to override any existing 9491da177e4SLinus Torvalds * non-permanent entry. This means that when we remove this entry, the 9501da177e4SLinus Torvalds * system automatically returns to the old behavior. 9511da177e4SLinus Torvalds */ 9521da177e4SLinus Torvalds list_add_rcu(&p->list, last_perm); 9531da177e4SLinus Torvalds out: 9541da177e4SLinus Torvalds spin_unlock_bh(&inetsw_lock); 9551da177e4SLinus Torvalds 9561da177e4SLinus Torvalds synchronize_net(); 9571da177e4SLinus Torvalds 9581da177e4SLinus Torvalds return; 9591da177e4SLinus Torvalds 9601da177e4SLinus Torvalds out_permanent: 9611da177e4SLinus Torvalds printk(KERN_ERR "Attempt to override permanent protocol %d.\n", 9621da177e4SLinus Torvalds protocol); 9631da177e4SLinus Torvalds goto out; 9641da177e4SLinus Torvalds 9651da177e4SLinus Torvalds out_illegal: 9661da177e4SLinus Torvalds printk(KERN_ERR 9671da177e4SLinus Torvalds "Ignoring attempt to register invalid socket type %d.\n", 9681da177e4SLinus Torvalds p->type); 9691da177e4SLinus Torvalds goto out; 9701da177e4SLinus Torvalds } 9711da177e4SLinus Torvalds 9721da177e4SLinus Torvalds void inet_unregister_protosw(struct inet_protosw *p) 9731da177e4SLinus Torvalds { 9741da177e4SLinus Torvalds if (INET_PROTOSW_PERMANENT & p->flags) { 9751da177e4SLinus Torvalds printk(KERN_ERR 9761da177e4SLinus Torvalds "Attempt to unregister permanent protocol %d.\n", 9771da177e4SLinus Torvalds p->protocol); 9781da177e4SLinus Torvalds } else { 9791da177e4SLinus Torvalds spin_lock_bh(&inetsw_lock); 9801da177e4SLinus Torvalds list_del_rcu(&p->list); 9811da177e4SLinus Torvalds spin_unlock_bh(&inetsw_lock); 9821da177e4SLinus Torvalds 9831da177e4SLinus Torvalds synchronize_net(); 9841da177e4SLinus Torvalds } 9851da177e4SLinus Torvalds } 9861da177e4SLinus Torvalds 98732519f11SArnaldo Carvalho de Melo /* 98832519f11SArnaldo Carvalho de Melo * Shall we try to damage output packets if routing dev changes? 98932519f11SArnaldo Carvalho de Melo */ 99032519f11SArnaldo Carvalho de Melo 991ab32ea5dSBrian Haley int sysctl_ip_dynaddr __read_mostly; 99232519f11SArnaldo Carvalho de Melo 99332519f11SArnaldo Carvalho de Melo static int inet_sk_reselect_saddr(struct sock *sk) 99432519f11SArnaldo Carvalho de Melo { 99532519f11SArnaldo Carvalho de Melo struct inet_sock *inet = inet_sk(sk); 99632519f11SArnaldo Carvalho de Melo int err; 99732519f11SArnaldo Carvalho de Melo struct rtable *rt; 998714e85beSAl Viro __be32 old_saddr = inet->saddr; 999714e85beSAl Viro __be32 new_saddr; 1000bada8adcSAl Viro __be32 daddr = inet->daddr; 100132519f11SArnaldo Carvalho de Melo 100232519f11SArnaldo Carvalho de Melo if (inet->opt && inet->opt->srr) 100332519f11SArnaldo Carvalho de Melo daddr = inet->opt->faddr; 100432519f11SArnaldo Carvalho de Melo 100532519f11SArnaldo Carvalho de Melo /* Query new route. */ 100632519f11SArnaldo Carvalho de Melo err = ip_route_connect(&rt, daddr, 0, 100732519f11SArnaldo Carvalho de Melo RT_CONN_FLAGS(sk), 100832519f11SArnaldo Carvalho de Melo sk->sk_bound_dev_if, 100932519f11SArnaldo Carvalho de Melo sk->sk_protocol, 10108eb9086fSDavid S. Miller inet->sport, inet->dport, sk, 0); 101132519f11SArnaldo Carvalho de Melo if (err) 101232519f11SArnaldo Carvalho de Melo return err; 101332519f11SArnaldo Carvalho de Melo 101432519f11SArnaldo Carvalho de Melo sk_setup_caps(sk, &rt->u.dst); 101532519f11SArnaldo Carvalho de Melo 101632519f11SArnaldo Carvalho de Melo new_saddr = rt->rt_src; 101732519f11SArnaldo Carvalho de Melo 101832519f11SArnaldo Carvalho de Melo if (new_saddr == old_saddr) 101932519f11SArnaldo Carvalho de Melo return 0; 102032519f11SArnaldo Carvalho de Melo 102132519f11SArnaldo Carvalho de Melo if (sysctl_ip_dynaddr > 1) { 102232519f11SArnaldo Carvalho de Melo printk(KERN_INFO "%s(): shifting inet->" 102332519f11SArnaldo Carvalho de Melo "saddr from %d.%d.%d.%d to %d.%d.%d.%d\n", 102432519f11SArnaldo Carvalho de Melo __FUNCTION__, 102532519f11SArnaldo Carvalho de Melo NIPQUAD(old_saddr), 102632519f11SArnaldo Carvalho de Melo NIPQUAD(new_saddr)); 102732519f11SArnaldo Carvalho de Melo } 102832519f11SArnaldo Carvalho de Melo 102932519f11SArnaldo Carvalho de Melo inet->saddr = inet->rcv_saddr = new_saddr; 103032519f11SArnaldo Carvalho de Melo 103132519f11SArnaldo Carvalho de Melo /* 103232519f11SArnaldo Carvalho de Melo * XXX The only one ugly spot where we need to 103332519f11SArnaldo Carvalho de Melo * XXX really change the sockets identity after 103432519f11SArnaldo Carvalho de Melo * XXX it has entered the hashes. -DaveM 103532519f11SArnaldo Carvalho de Melo * 103632519f11SArnaldo Carvalho de Melo * Besides that, it does not check for connection 103732519f11SArnaldo Carvalho de Melo * uniqueness. Wait for troubles. 103832519f11SArnaldo Carvalho de Melo */ 103932519f11SArnaldo Carvalho de Melo __sk_prot_rehash(sk); 104032519f11SArnaldo Carvalho de Melo return 0; 104132519f11SArnaldo Carvalho de Melo } 104232519f11SArnaldo Carvalho de Melo 104332519f11SArnaldo Carvalho de Melo int inet_sk_rebuild_header(struct sock *sk) 104432519f11SArnaldo Carvalho de Melo { 104532519f11SArnaldo Carvalho de Melo struct inet_sock *inet = inet_sk(sk); 104632519f11SArnaldo Carvalho de Melo struct rtable *rt = (struct rtable *)__sk_dst_check(sk, 0); 10473ca3c68eSAl Viro __be32 daddr; 104832519f11SArnaldo Carvalho de Melo int err; 104932519f11SArnaldo Carvalho de Melo 105032519f11SArnaldo Carvalho de Melo /* Route is OK, nothing to do. */ 105132519f11SArnaldo Carvalho de Melo if (rt) 105232519f11SArnaldo Carvalho de Melo return 0; 105332519f11SArnaldo Carvalho de Melo 105432519f11SArnaldo Carvalho de Melo /* Reroute. */ 105532519f11SArnaldo Carvalho de Melo daddr = inet->daddr; 105632519f11SArnaldo Carvalho de Melo if (inet->opt && inet->opt->srr) 105732519f11SArnaldo Carvalho de Melo daddr = inet->opt->faddr; 105832519f11SArnaldo Carvalho de Melo { 105932519f11SArnaldo Carvalho de Melo struct flowi fl = { 106032519f11SArnaldo Carvalho de Melo .oif = sk->sk_bound_dev_if, 106132519f11SArnaldo Carvalho de Melo .nl_u = { 106232519f11SArnaldo Carvalho de Melo .ip4_u = { 106332519f11SArnaldo Carvalho de Melo .daddr = daddr, 106432519f11SArnaldo Carvalho de Melo .saddr = inet->saddr, 106532519f11SArnaldo Carvalho de Melo .tos = RT_CONN_FLAGS(sk), 106632519f11SArnaldo Carvalho de Melo }, 106732519f11SArnaldo Carvalho de Melo }, 106832519f11SArnaldo Carvalho de Melo .proto = sk->sk_protocol, 106932519f11SArnaldo Carvalho de Melo .uli_u = { 107032519f11SArnaldo Carvalho de Melo .ports = { 107132519f11SArnaldo Carvalho de Melo .sport = inet->sport, 107232519f11SArnaldo Carvalho de Melo .dport = inet->dport, 107332519f11SArnaldo Carvalho de Melo }, 107432519f11SArnaldo Carvalho de Melo }, 107532519f11SArnaldo Carvalho de Melo }; 107632519f11SArnaldo Carvalho de Melo 1077beb8d13bSVenkat Yekkirala security_sk_classify_flow(sk, &fl); 107832519f11SArnaldo Carvalho de Melo err = ip_route_output_flow(&rt, &fl, sk, 0); 107932519f11SArnaldo Carvalho de Melo } 108032519f11SArnaldo Carvalho de Melo if (!err) 108132519f11SArnaldo Carvalho de Melo sk_setup_caps(sk, &rt->u.dst); 108232519f11SArnaldo Carvalho de Melo else { 108332519f11SArnaldo Carvalho de Melo /* Routing failed... */ 108432519f11SArnaldo Carvalho de Melo sk->sk_route_caps = 0; 108532519f11SArnaldo Carvalho de Melo /* 108632519f11SArnaldo Carvalho de Melo * Other protocols have to map its equivalent state to TCP_SYN_SENT. 108732519f11SArnaldo Carvalho de Melo * DCCP maps its DCCP_REQUESTING state to TCP_SYN_SENT. -acme 108832519f11SArnaldo Carvalho de Melo */ 108932519f11SArnaldo Carvalho de Melo if (!sysctl_ip_dynaddr || 109032519f11SArnaldo Carvalho de Melo sk->sk_state != TCP_SYN_SENT || 109132519f11SArnaldo Carvalho de Melo (sk->sk_userlocks & SOCK_BINDADDR_LOCK) || 109232519f11SArnaldo Carvalho de Melo (err = inet_sk_reselect_saddr(sk)) != 0) 109332519f11SArnaldo Carvalho de Melo sk->sk_err_soft = -err; 109432519f11SArnaldo Carvalho de Melo } 109532519f11SArnaldo Carvalho de Melo 109632519f11SArnaldo Carvalho de Melo return err; 109732519f11SArnaldo Carvalho de Melo } 109832519f11SArnaldo Carvalho de Melo 109932519f11SArnaldo Carvalho de Melo EXPORT_SYMBOL(inet_sk_rebuild_header); 110032519f11SArnaldo Carvalho de Melo 1101a430a43dSHerbert Xu static int inet_gso_send_check(struct sk_buff *skb) 1102a430a43dSHerbert Xu { 1103a430a43dSHerbert Xu struct iphdr *iph; 1104a430a43dSHerbert Xu struct net_protocol *ops; 1105a430a43dSHerbert Xu int proto; 1106a430a43dSHerbert Xu int ihl; 1107a430a43dSHerbert Xu int err = -EINVAL; 1108a430a43dSHerbert Xu 1109a430a43dSHerbert Xu if (unlikely(!pskb_may_pull(skb, sizeof(*iph)))) 1110a430a43dSHerbert Xu goto out; 1111a430a43dSHerbert Xu 1112a430a43dSHerbert Xu iph = skb->nh.iph; 1113a430a43dSHerbert Xu ihl = iph->ihl * 4; 1114a430a43dSHerbert Xu if (ihl < sizeof(*iph)) 1115a430a43dSHerbert Xu goto out; 1116a430a43dSHerbert Xu 1117a430a43dSHerbert Xu if (unlikely(!pskb_may_pull(skb, ihl))) 1118a430a43dSHerbert Xu goto out; 1119a430a43dSHerbert Xu 1120a430a43dSHerbert Xu skb->h.raw = __skb_pull(skb, ihl); 1121a430a43dSHerbert Xu iph = skb->nh.iph; 1122a430a43dSHerbert Xu proto = iph->protocol & (MAX_INET_PROTOS - 1); 1123a430a43dSHerbert Xu err = -EPROTONOSUPPORT; 1124a430a43dSHerbert Xu 1125a430a43dSHerbert Xu rcu_read_lock(); 1126a430a43dSHerbert Xu ops = rcu_dereference(inet_protos[proto]); 1127a430a43dSHerbert Xu if (likely(ops && ops->gso_send_check)) 1128a430a43dSHerbert Xu err = ops->gso_send_check(skb); 1129a430a43dSHerbert Xu rcu_read_unlock(); 1130a430a43dSHerbert Xu 1131a430a43dSHerbert Xu out: 1132a430a43dSHerbert Xu return err; 1133a430a43dSHerbert Xu } 1134a430a43dSHerbert Xu 1135576a30ebSHerbert Xu static struct sk_buff *inet_gso_segment(struct sk_buff *skb, int features) 1136f4c50d99SHerbert Xu { 1137f4c50d99SHerbert Xu struct sk_buff *segs = ERR_PTR(-EINVAL); 1138f4c50d99SHerbert Xu struct iphdr *iph; 1139f4c50d99SHerbert Xu struct net_protocol *ops; 1140f4c50d99SHerbert Xu int proto; 1141f4c50d99SHerbert Xu int ihl; 1142f4c50d99SHerbert Xu int id; 1143f4c50d99SHerbert Xu 1144bbcf467dSHerbert Xu if (unlikely(skb_shinfo(skb)->gso_type & 1145bbcf467dSHerbert Xu ~(SKB_GSO_TCPV4 | 1146bbcf467dSHerbert Xu SKB_GSO_UDP | 1147bbcf467dSHerbert Xu SKB_GSO_DODGY | 1148bbcf467dSHerbert Xu SKB_GSO_TCP_ECN | 1149bbcf467dSHerbert Xu 0))) 1150bbcf467dSHerbert Xu goto out; 1151bbcf467dSHerbert Xu 1152bbcf467dSHerbert Xu if (unlikely(!pskb_may_pull(skb, sizeof(*iph)))) 1153f4c50d99SHerbert Xu goto out; 1154f4c50d99SHerbert Xu 1155f4c50d99SHerbert Xu iph = skb->nh.iph; 1156f4c50d99SHerbert Xu ihl = iph->ihl * 4; 1157f4c50d99SHerbert Xu if (ihl < sizeof(*iph)) 1158f4c50d99SHerbert Xu goto out; 1159f4c50d99SHerbert Xu 1160bbcf467dSHerbert Xu if (unlikely(!pskb_may_pull(skb, ihl))) 1161f4c50d99SHerbert Xu goto out; 1162f4c50d99SHerbert Xu 1163f4c50d99SHerbert Xu skb->h.raw = __skb_pull(skb, ihl); 1164f4c50d99SHerbert Xu iph = skb->nh.iph; 1165f4c50d99SHerbert Xu id = ntohs(iph->id); 1166f4c50d99SHerbert Xu proto = iph->protocol & (MAX_INET_PROTOS - 1); 1167f4c50d99SHerbert Xu segs = ERR_PTR(-EPROTONOSUPPORT); 1168f4c50d99SHerbert Xu 1169f4c50d99SHerbert Xu rcu_read_lock(); 1170f4c50d99SHerbert Xu ops = rcu_dereference(inet_protos[proto]); 1171bbcf467dSHerbert Xu if (likely(ops && ops->gso_segment)) 1172576a30ebSHerbert Xu segs = ops->gso_segment(skb, features); 1173f4c50d99SHerbert Xu rcu_read_unlock(); 1174f4c50d99SHerbert Xu 1175576a30ebSHerbert Xu if (!segs || unlikely(IS_ERR(segs))) 1176f4c50d99SHerbert Xu goto out; 1177f4c50d99SHerbert Xu 1178f4c50d99SHerbert Xu skb = segs; 1179f4c50d99SHerbert Xu do { 1180f4c50d99SHerbert Xu iph = skb->nh.iph; 1181f4c50d99SHerbert Xu iph->id = htons(id++); 1182f4c50d99SHerbert Xu iph->tot_len = htons(skb->len - skb->mac_len); 1183f4c50d99SHerbert Xu iph->check = 0; 1184f4c50d99SHerbert Xu iph->check = ip_fast_csum(skb->nh.raw, iph->ihl); 1185f4c50d99SHerbert Xu } while ((skb = skb->next)); 1186f4c50d99SHerbert Xu 1187f4c50d99SHerbert Xu out: 1188f4c50d99SHerbert Xu return segs; 1189f4c50d99SHerbert Xu } 1190f4c50d99SHerbert Xu 11911da177e4SLinus Torvalds #ifdef CONFIG_IP_MULTICAST 11921da177e4SLinus Torvalds static struct net_protocol igmp_protocol = { 11931da177e4SLinus Torvalds .handler = igmp_rcv, 11941da177e4SLinus Torvalds }; 11951da177e4SLinus Torvalds #endif 11961da177e4SLinus Torvalds 11971da177e4SLinus Torvalds static struct net_protocol tcp_protocol = { 11981da177e4SLinus Torvalds .handler = tcp_v4_rcv, 11991da177e4SLinus Torvalds .err_handler = tcp_v4_err, 1200a430a43dSHerbert Xu .gso_send_check = tcp_v4_gso_send_check, 1201f4c50d99SHerbert Xu .gso_segment = tcp_tso_segment, 12021da177e4SLinus Torvalds .no_policy = 1, 12031da177e4SLinus Torvalds }; 12041da177e4SLinus Torvalds 12051da177e4SLinus Torvalds static struct net_protocol udp_protocol = { 12061da177e4SLinus Torvalds .handler = udp_rcv, 12071da177e4SLinus Torvalds .err_handler = udp_err, 12081da177e4SLinus Torvalds .no_policy = 1, 12091da177e4SLinus Torvalds }; 12101da177e4SLinus Torvalds 12111da177e4SLinus Torvalds static struct net_protocol icmp_protocol = { 12121da177e4SLinus Torvalds .handler = icmp_rcv, 12131da177e4SLinus Torvalds }; 12141da177e4SLinus Torvalds 12151da177e4SLinus Torvalds static int __init init_ipv4_mibs(void) 12161da177e4SLinus Torvalds { 12171da177e4SLinus Torvalds net_statistics[0] = alloc_percpu(struct linux_mib); 12181da177e4SLinus Torvalds net_statistics[1] = alloc_percpu(struct linux_mib); 12191da177e4SLinus Torvalds ip_statistics[0] = alloc_percpu(struct ipstats_mib); 12201da177e4SLinus Torvalds ip_statistics[1] = alloc_percpu(struct ipstats_mib); 12211da177e4SLinus Torvalds icmp_statistics[0] = alloc_percpu(struct icmp_mib); 12221da177e4SLinus Torvalds icmp_statistics[1] = alloc_percpu(struct icmp_mib); 12231da177e4SLinus Torvalds tcp_statistics[0] = alloc_percpu(struct tcp_mib); 12241da177e4SLinus Torvalds tcp_statistics[1] = alloc_percpu(struct tcp_mib); 12251da177e4SLinus Torvalds udp_statistics[0] = alloc_percpu(struct udp_mib); 12261da177e4SLinus Torvalds udp_statistics[1] = alloc_percpu(struct udp_mib); 1227ba4e58ecSGerrit Renker udplite_statistics[0] = alloc_percpu(struct udp_mib); 1228ba4e58ecSGerrit Renker udplite_statistics[1] = alloc_percpu(struct udp_mib); 12291da177e4SLinus Torvalds if (! 12301da177e4SLinus Torvalds (net_statistics[0] && net_statistics[1] && ip_statistics[0] 12311da177e4SLinus Torvalds && ip_statistics[1] && tcp_statistics[0] && tcp_statistics[1] 1232ba4e58ecSGerrit Renker && udp_statistics[0] && udp_statistics[1] 1233ba4e58ecSGerrit Renker && udplite_statistics[0] && udplite_statistics[1] ) ) 12341da177e4SLinus Torvalds return -ENOMEM; 12351da177e4SLinus Torvalds 12361da177e4SLinus Torvalds (void) tcp_mib_init(); 12371da177e4SLinus Torvalds 12381da177e4SLinus Torvalds return 0; 12391da177e4SLinus Torvalds } 12401da177e4SLinus Torvalds 12411da177e4SLinus Torvalds static int ipv4_proc_init(void); 12421da177e4SLinus Torvalds 124330e224d7SHerbert Xu /* 124430e224d7SHerbert Xu * IP protocol layer initialiser 124530e224d7SHerbert Xu */ 124630e224d7SHerbert Xu 124730e224d7SHerbert Xu static struct packet_type ip_packet_type = { 124830e224d7SHerbert Xu .type = __constant_htons(ETH_P_IP), 124930e224d7SHerbert Xu .func = ip_rcv, 1250a430a43dSHerbert Xu .gso_send_check = inet_gso_send_check, 1251f4c50d99SHerbert Xu .gso_segment = inet_gso_segment, 125230e224d7SHerbert Xu }; 125330e224d7SHerbert Xu 12541da177e4SLinus Torvalds static int __init inet_init(void) 12551da177e4SLinus Torvalds { 12561da177e4SLinus Torvalds struct sk_buff *dummy_skb; 12571da177e4SLinus Torvalds struct inet_protosw *q; 12581da177e4SLinus Torvalds struct list_head *r; 12591da177e4SLinus Torvalds int rc = -EINVAL; 12601da177e4SLinus Torvalds 1261ef047f5eSYOSHIFUJI Hideaki BUILD_BUG_ON(sizeof(struct inet_skb_parm) > sizeof(dummy_skb->cb)); 12621da177e4SLinus Torvalds 12631da177e4SLinus Torvalds rc = proto_register(&tcp_prot, 1); 12641da177e4SLinus Torvalds if (rc) 12651da177e4SLinus Torvalds goto out; 12661da177e4SLinus Torvalds 12671da177e4SLinus Torvalds rc = proto_register(&udp_prot, 1); 12681da177e4SLinus Torvalds if (rc) 12691da177e4SLinus Torvalds goto out_unregister_tcp_proto; 12701da177e4SLinus Torvalds 12711da177e4SLinus Torvalds rc = proto_register(&raw_prot, 1); 12721da177e4SLinus Torvalds if (rc) 12731da177e4SLinus Torvalds goto out_unregister_udp_proto; 12741da177e4SLinus Torvalds 12751da177e4SLinus Torvalds /* 12761da177e4SLinus Torvalds * Tell SOCKET that we are alive... 12771da177e4SLinus Torvalds */ 12781da177e4SLinus Torvalds 12791da177e4SLinus Torvalds (void)sock_register(&inet_family_ops); 12801da177e4SLinus Torvalds 12811da177e4SLinus Torvalds /* 12821da177e4SLinus Torvalds * Add all the base protocols. 12831da177e4SLinus Torvalds */ 12841da177e4SLinus Torvalds 12851da177e4SLinus Torvalds if (inet_add_protocol(&icmp_protocol, IPPROTO_ICMP) < 0) 12861da177e4SLinus Torvalds printk(KERN_CRIT "inet_init: Cannot add ICMP protocol\n"); 12871da177e4SLinus Torvalds if (inet_add_protocol(&udp_protocol, IPPROTO_UDP) < 0) 12881da177e4SLinus Torvalds printk(KERN_CRIT "inet_init: Cannot add UDP protocol\n"); 12891da177e4SLinus Torvalds if (inet_add_protocol(&tcp_protocol, IPPROTO_TCP) < 0) 12901da177e4SLinus Torvalds printk(KERN_CRIT "inet_init: Cannot add TCP protocol\n"); 12911da177e4SLinus Torvalds #ifdef CONFIG_IP_MULTICAST 12921da177e4SLinus Torvalds if (inet_add_protocol(&igmp_protocol, IPPROTO_IGMP) < 0) 12931da177e4SLinus Torvalds printk(KERN_CRIT "inet_init: Cannot add IGMP protocol\n"); 12941da177e4SLinus Torvalds #endif 12951da177e4SLinus Torvalds 12961da177e4SLinus Torvalds /* Register the socket-side information for inet_create. */ 12971da177e4SLinus Torvalds for (r = &inetsw[0]; r < &inetsw[SOCK_MAX]; ++r) 12981da177e4SLinus Torvalds INIT_LIST_HEAD(r); 12991da177e4SLinus Torvalds 13001da177e4SLinus Torvalds for (q = inetsw_array; q < &inetsw_array[INETSW_ARRAY_LEN]; ++q) 13011da177e4SLinus Torvalds inet_register_protosw(q); 13021da177e4SLinus Torvalds 13031da177e4SLinus Torvalds /* 13041da177e4SLinus Torvalds * Set the ARP module up 13051da177e4SLinus Torvalds */ 13061da177e4SLinus Torvalds 13071da177e4SLinus Torvalds arp_init(); 13081da177e4SLinus Torvalds 13091da177e4SLinus Torvalds /* 13101da177e4SLinus Torvalds * Set the IP module up 13111da177e4SLinus Torvalds */ 13121da177e4SLinus Torvalds 13131da177e4SLinus Torvalds ip_init(); 13141da177e4SLinus Torvalds 13151da177e4SLinus Torvalds tcp_v4_init(&inet_family_ops); 13161da177e4SLinus Torvalds 13171da177e4SLinus Torvalds /* Setup TCP slab cache for open requests. */ 13181da177e4SLinus Torvalds tcp_init(); 13191da177e4SLinus Torvalds 1320ba4e58ecSGerrit Renker /* Add UDP-Lite (RFC 3828) */ 1321ba4e58ecSGerrit Renker udplite4_register(); 13221da177e4SLinus Torvalds 13231da177e4SLinus Torvalds /* 13241da177e4SLinus Torvalds * Set the ICMP layer up 13251da177e4SLinus Torvalds */ 13261da177e4SLinus Torvalds 13271da177e4SLinus Torvalds icmp_init(&inet_family_ops); 13281da177e4SLinus Torvalds 13291da177e4SLinus Torvalds /* 13301da177e4SLinus Torvalds * Initialise the multicast router 13311da177e4SLinus Torvalds */ 13321da177e4SLinus Torvalds #if defined(CONFIG_IP_MROUTE) 13331da177e4SLinus Torvalds ip_mr_init(); 13341da177e4SLinus Torvalds #endif 13351da177e4SLinus Torvalds /* 13361da177e4SLinus Torvalds * Initialise per-cpu ipv4 mibs 13371da177e4SLinus Torvalds */ 13381da177e4SLinus Torvalds 13391da177e4SLinus Torvalds if(init_ipv4_mibs()) 13401da177e4SLinus Torvalds printk(KERN_CRIT "inet_init: Cannot init ipv4 mibs\n"); ; 13411da177e4SLinus Torvalds 13421da177e4SLinus Torvalds ipv4_proc_init(); 13431da177e4SLinus Torvalds 13441da177e4SLinus Torvalds ipfrag_init(); 13451da177e4SLinus Torvalds 134630e224d7SHerbert Xu dev_add_pack(&ip_packet_type); 134730e224d7SHerbert Xu 13481da177e4SLinus Torvalds rc = 0; 13491da177e4SLinus Torvalds out: 13501da177e4SLinus Torvalds return rc; 13511da177e4SLinus Torvalds out_unregister_udp_proto: 13521da177e4SLinus Torvalds proto_unregister(&udp_prot); 1353321efff7SOlaf Kirch out_unregister_tcp_proto: 1354321efff7SOlaf Kirch proto_unregister(&tcp_prot); 13551da177e4SLinus Torvalds goto out; 13561da177e4SLinus Torvalds } 13571da177e4SLinus Torvalds 1358a536e077SHeiko Carstens fs_initcall(inet_init); 13591da177e4SLinus Torvalds 13601da177e4SLinus Torvalds /* ------------------------------------------------------------------------ */ 13611da177e4SLinus Torvalds 13621da177e4SLinus Torvalds #ifdef CONFIG_PROC_FS 13631da177e4SLinus Torvalds static int __init ipv4_proc_init(void) 13641da177e4SLinus Torvalds { 13651da177e4SLinus Torvalds int rc = 0; 13661da177e4SLinus Torvalds 13671da177e4SLinus Torvalds if (raw_proc_init()) 13681da177e4SLinus Torvalds goto out_raw; 13691da177e4SLinus Torvalds if (tcp4_proc_init()) 13701da177e4SLinus Torvalds goto out_tcp; 13711da177e4SLinus Torvalds if (udp4_proc_init()) 13721da177e4SLinus Torvalds goto out_udp; 13731da177e4SLinus Torvalds if (fib_proc_init()) 13741da177e4SLinus Torvalds goto out_fib; 13751da177e4SLinus Torvalds if (ip_misc_proc_init()) 13761da177e4SLinus Torvalds goto out_misc; 13771da177e4SLinus Torvalds out: 13781da177e4SLinus Torvalds return rc; 13791da177e4SLinus Torvalds out_misc: 13801da177e4SLinus Torvalds fib_proc_exit(); 13811da177e4SLinus Torvalds out_fib: 13821da177e4SLinus Torvalds udp4_proc_exit(); 13831da177e4SLinus Torvalds out_udp: 13841da177e4SLinus Torvalds tcp4_proc_exit(); 13851da177e4SLinus Torvalds out_tcp: 13861da177e4SLinus Torvalds raw_proc_exit(); 13871da177e4SLinus Torvalds out_raw: 13881da177e4SLinus Torvalds rc = -ENOMEM; 13891da177e4SLinus Torvalds goto out; 13901da177e4SLinus Torvalds } 13911da177e4SLinus Torvalds 13921da177e4SLinus Torvalds #else /* CONFIG_PROC_FS */ 13931da177e4SLinus Torvalds static int __init ipv4_proc_init(void) 13941da177e4SLinus Torvalds { 13951da177e4SLinus Torvalds return 0; 13961da177e4SLinus Torvalds } 13971da177e4SLinus Torvalds #endif /* CONFIG_PROC_FS */ 13981da177e4SLinus Torvalds 13991da177e4SLinus Torvalds MODULE_ALIAS_NETPROTO(PF_INET); 14001da177e4SLinus Torvalds 14011da177e4SLinus Torvalds EXPORT_SYMBOL(inet_accept); 14021da177e4SLinus Torvalds EXPORT_SYMBOL(inet_bind); 14031da177e4SLinus Torvalds EXPORT_SYMBOL(inet_dgram_connect); 14041da177e4SLinus Torvalds EXPORT_SYMBOL(inet_dgram_ops); 14051da177e4SLinus Torvalds EXPORT_SYMBOL(inet_getname); 14061da177e4SLinus Torvalds EXPORT_SYMBOL(inet_ioctl); 14071da177e4SLinus Torvalds EXPORT_SYMBOL(inet_listen); 14081da177e4SLinus Torvalds EXPORT_SYMBOL(inet_register_protosw); 14091da177e4SLinus Torvalds EXPORT_SYMBOL(inet_release); 14101da177e4SLinus Torvalds EXPORT_SYMBOL(inet_sendmsg); 14111da177e4SLinus Torvalds EXPORT_SYMBOL(inet_shutdown); 14121da177e4SLinus Torvalds EXPORT_SYMBOL(inet_sock_destruct); 14131da177e4SLinus Torvalds EXPORT_SYMBOL(inet_stream_connect); 14141da177e4SLinus Torvalds EXPORT_SYMBOL(inet_stream_ops); 14151da177e4SLinus Torvalds EXPORT_SYMBOL(inet_unregister_protosw); 14161da177e4SLinus Torvalds EXPORT_SYMBOL(net_statistics); 1417cdac4e07SNeil Horman EXPORT_SYMBOL(sysctl_ip_nonlocal_bind); 1418