12874c5fdSThomas Gleixner // SPDX-License-Identifier: GPL-2.0-or-later 21da177e4SLinus Torvalds /* 31da177e4SLinus Torvalds * INET An implementation of the TCP/IP protocol suite for the LINUX 41da177e4SLinus Torvalds * operating system. INET is implemented using the BSD Socket 51da177e4SLinus Torvalds * interface as the means of communication with the user level. 61da177e4SLinus Torvalds * 71da177e4SLinus Torvalds * PF_INET protocol family socket handler. 81da177e4SLinus Torvalds * 902c30a84SJesper Juhl * Authors: Ross Biro 101da177e4SLinus Torvalds * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG> 111da177e4SLinus Torvalds * Florian La Roche, <flla@stud.uni-sb.de> 121da177e4SLinus Torvalds * Alan Cox, <A.Cox@swansea.ac.uk> 131da177e4SLinus Torvalds * 141da177e4SLinus Torvalds * Changes (see also sock.c) 151da177e4SLinus Torvalds * 161da177e4SLinus Torvalds * piggy, 171da177e4SLinus Torvalds * Karl Knutson : Socket protocol table 181da177e4SLinus Torvalds * A.N.Kuznetsov : Socket death error in accept(). 191da177e4SLinus Torvalds * John Richardson : Fix non blocking error in connect() 201da177e4SLinus Torvalds * so sockets that fail to connect 211da177e4SLinus Torvalds * don't return -EINPROGRESS. 221da177e4SLinus Torvalds * Alan Cox : Asynchronous I/O support 231da177e4SLinus Torvalds * Alan Cox : Keep correct socket pointer on sock 241da177e4SLinus Torvalds * structures 251da177e4SLinus Torvalds * when accept() ed 261da177e4SLinus Torvalds * Alan Cox : Semantics of SO_LINGER aren't state 271da177e4SLinus Torvalds * moved to close when you look carefully. 281da177e4SLinus Torvalds * With this fixed and the accept bug fixed 291da177e4SLinus Torvalds * some RPC stuff seems happier. 301da177e4SLinus Torvalds * Niibe Yutaka : 4.4BSD style write async I/O 311da177e4SLinus Torvalds * Alan Cox, 321da177e4SLinus Torvalds * Tony Gale : Fixed reuse semantics. 331da177e4SLinus Torvalds * Alan Cox : bind() shouldn't abort existing but dead 341da177e4SLinus Torvalds * sockets. Stops FTP netin:.. I hope. 351da177e4SLinus Torvalds * Alan Cox : bind() works correctly for RAW sockets. 361da177e4SLinus Torvalds * Note that FreeBSD at least was broken 371da177e4SLinus Torvalds * in this respect so be careful with 381da177e4SLinus Torvalds * compatibility tests... 391da177e4SLinus Torvalds * Alan Cox : routing cache support 401da177e4SLinus Torvalds * Alan Cox : memzero the socket structure for 411da177e4SLinus Torvalds * compactness. 421da177e4SLinus Torvalds * Matt Day : nonblock connect error handler 431da177e4SLinus Torvalds * Alan Cox : Allow large numbers of pending sockets 441da177e4SLinus Torvalds * (eg for big web sites), but only if 451da177e4SLinus Torvalds * specifically application requested. 461da177e4SLinus Torvalds * Alan Cox : New buffering throughout IP. Used 471da177e4SLinus Torvalds * dumbly. 481da177e4SLinus Torvalds * Alan Cox : New buffering now used smartly. 491da177e4SLinus Torvalds * Alan Cox : BSD rather than common sense 501da177e4SLinus Torvalds * interpretation of listen. 511da177e4SLinus Torvalds * Germano Caronni : Assorted small races. 521da177e4SLinus Torvalds * Alan Cox : sendmsg/recvmsg basic support. 531da177e4SLinus Torvalds * Alan Cox : Only sendmsg/recvmsg now supported. 541da177e4SLinus Torvalds * Alan Cox : Locked down bind (see security list). 551da177e4SLinus Torvalds * Alan Cox : Loosened bind a little. 561da177e4SLinus Torvalds * Mike McLagan : ADD/DEL DLCI Ioctls 571da177e4SLinus Torvalds * Willy Konynenberg : Transparent proxying support. 581da177e4SLinus Torvalds * David S. Miller : New socket lookup architecture. 591da177e4SLinus Torvalds * Some other random speedups. 601da177e4SLinus Torvalds * Cyrus Durgin : Cleaned up file for kmod hacks. 611da177e4SLinus Torvalds * Andi Kleen : Fix inet_stream_connect TCP race. 621da177e4SLinus Torvalds */ 631da177e4SLinus Torvalds 64afd46503SJoe Perches #define pr_fmt(fmt) "IPv4: " fmt 65afd46503SJoe Perches 66f4c50d99SHerbert Xu #include <linux/err.h> 671da177e4SLinus Torvalds #include <linux/errno.h> 681da177e4SLinus Torvalds #include <linux/types.h> 691da177e4SLinus Torvalds #include <linux/socket.h> 701da177e4SLinus Torvalds #include <linux/in.h> 711da177e4SLinus Torvalds #include <linux/kernel.h> 72d3fc0353SPaul Gortmaker #include <linux/kmod.h> 731da177e4SLinus Torvalds #include <linux/sched.h> 741da177e4SLinus Torvalds #include <linux/timer.h> 751da177e4SLinus Torvalds #include <linux/string.h> 761da177e4SLinus Torvalds #include <linux/sockios.h> 771da177e4SLinus Torvalds #include <linux/net.h> 784fc268d2SRandy Dunlap #include <linux/capability.h> 791da177e4SLinus Torvalds #include <linux/fcntl.h> 801da177e4SLinus Torvalds #include <linux/mm.h> 811da177e4SLinus Torvalds #include <linux/interrupt.h> 821da177e4SLinus Torvalds #include <linux/stat.h> 831da177e4SLinus Torvalds #include <linux/init.h> 841da177e4SLinus Torvalds #include <linux/poll.h> 851da177e4SLinus Torvalds #include <linux/netfilter_ipv4.h> 86b3da2cf3SDavid S. Miller #include <linux/random.h> 875a0e3ad6STejun Heo #include <linux/slab.h> 881da177e4SLinus Torvalds 897c0f6ba6SLinus Torvalds #include <linux/uaccess.h> 901da177e4SLinus Torvalds 911da177e4SLinus Torvalds #include <linux/inet.h> 921da177e4SLinus Torvalds #include <linux/igmp.h> 9314c85021SArnaldo Carvalho de Melo #include <linux/inetdevice.h> 941da177e4SLinus Torvalds #include <linux/netdevice.h> 9573cc19f1SHerbert Xu #include <net/checksum.h> 961da177e4SLinus Torvalds #include <net/ip.h> 971da177e4SLinus Torvalds #include <net/protocol.h> 981da177e4SLinus Torvalds #include <net/arp.h> 991da177e4SLinus Torvalds #include <net/route.h> 1001da177e4SLinus Torvalds #include <net/ip_fib.h> 101295f7324SArnaldo Carvalho de Melo #include <net/inet_connection_sock.h> 1021da177e4SLinus Torvalds #include <net/tcp.h> 1031da177e4SLinus Torvalds #include <net/udp.h> 104ba4e58ecSGerrit Renker #include <net/udplite.h> 105c319b4d7SVasiliy Kulikov #include <net/ping.h> 1061da177e4SLinus Torvalds #include <linux/skbuff.h> 1071da177e4SLinus Torvalds #include <net/sock.h> 1081da177e4SLinus Torvalds #include <net/raw.h> 1091da177e4SLinus Torvalds #include <net/icmp.h> 1101da177e4SLinus Torvalds #include <net/inet_common.h> 111045a0fa0SThomas Graf #include <net/ip_tunnels.h> 1121da177e4SLinus Torvalds #include <net/xfrm.h> 1139b4661bdSPavel Emelyanov #include <net/net_namespace.h> 114aebda156SEric Dumazet #include <net/secure_seq.h> 1151da177e4SLinus Torvalds #ifdef CONFIG_IP_MROUTE 1161da177e4SLinus Torvalds #include <linux/mroute.h> 1171da177e4SLinus Torvalds #endif 1183236b004SDavid Ahern #include <net/l3mdev.h> 1191da177e4SLinus Torvalds 120563e0bb0SYafang Shao #include <trace/events/sock.h> 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); 1358b27dae5SEric Dumazet if (sk->sk_rx_skb_cache) { 1368b27dae5SEric Dumazet __kfree_skb(sk->sk_rx_skb_cache); 1378b27dae5SEric Dumazet sk->sk_rx_skb_cache = NULL; 1388b27dae5SEric Dumazet } 1391da177e4SLinus Torvalds __skb_queue_purge(&sk->sk_error_queue); 1401da177e4SLinus Torvalds 14195766fffSHideo Aoki sk_mem_reclaim(sk); 14295766fffSHideo Aoki 1431da177e4SLinus Torvalds if (sk->sk_type == SOCK_STREAM && sk->sk_state != TCP_CLOSE) { 1443d1427f8SEric Dumazet pr_err("Attempt to release TCP socket in state %d %p\n", 1451da177e4SLinus Torvalds sk->sk_state, sk); 1461da177e4SLinus Torvalds return; 1471da177e4SLinus Torvalds } 1481da177e4SLinus Torvalds if (!sock_flag(sk, SOCK_DEAD)) { 1493d1427f8SEric Dumazet pr_err("Attempt to release alive inet socket %p\n", sk); 1501da177e4SLinus Torvalds return; 1511da177e4SLinus Torvalds } 1521da177e4SLinus Torvalds 153547b792cSIlpo Järvinen WARN_ON(atomic_read(&sk->sk_rmem_alloc)); 15414afee4bSReshetova, Elena WARN_ON(refcount_read(&sk->sk_wmem_alloc)); 155547b792cSIlpo Järvinen WARN_ON(sk->sk_wmem_queued); 156547b792cSIlpo Järvinen WARN_ON(sk->sk_forward_alloc); 1571da177e4SLinus Torvalds 158f6d8bd05SEric Dumazet kfree(rcu_dereference_protected(inet->inet_opt, 1)); 1595869b8faSXin Long dst_release(rcu_dereference_protected(sk->sk_dst_cache, 1)); 16041063e9dSDavid S. Miller dst_release(sk->sk_rx_dst); 161e6848976SArnaldo Carvalho de Melo sk_refcnt_debug_dec(sk); 1621da177e4SLinus Torvalds } 1633d1427f8SEric Dumazet EXPORT_SYMBOL(inet_sock_destruct); 1641da177e4SLinus Torvalds 1651da177e4SLinus Torvalds /* 1661da177e4SLinus Torvalds * The routines beyond this point handle the behaviour of an AF_INET 1671da177e4SLinus Torvalds * socket object. Mostly it punts to the subprotocols of IP to do 1681da177e4SLinus Torvalds * the work. 1691da177e4SLinus Torvalds */ 1701da177e4SLinus Torvalds 1711da177e4SLinus Torvalds /* 1721da177e4SLinus Torvalds * Automatically bind an unbound socket. 1731da177e4SLinus Torvalds */ 1741da177e4SLinus Torvalds 1751da177e4SLinus Torvalds static int inet_autobind(struct sock *sk) 1761da177e4SLinus Torvalds { 1771da177e4SLinus Torvalds struct inet_sock *inet; 1781da177e4SLinus Torvalds /* We may need to bind the socket. */ 1791da177e4SLinus Torvalds lock_sock(sk); 1801da177e4SLinus Torvalds inet = inet_sk(sk); 181c720c7e8SEric Dumazet if (!inet->inet_num) { 1821da177e4SLinus Torvalds if (sk->sk_prot->get_port(sk, 0)) { 1831da177e4SLinus Torvalds release_sock(sk); 1841da177e4SLinus Torvalds return -EAGAIN; 1851da177e4SLinus Torvalds } 186c720c7e8SEric Dumazet inet->inet_sport = htons(inet->inet_num); 1871da177e4SLinus Torvalds } 1881da177e4SLinus Torvalds release_sock(sk); 1891da177e4SLinus Torvalds return 0; 1901da177e4SLinus Torvalds } 1911da177e4SLinus Torvalds 1921da177e4SLinus Torvalds /* 1931da177e4SLinus Torvalds * Move a socket into listening state. 1941da177e4SLinus Torvalds */ 1951da177e4SLinus Torvalds int inet_listen(struct socket *sock, int backlog) 1961da177e4SLinus Torvalds { 1971da177e4SLinus Torvalds struct sock *sk = sock->sk; 1981da177e4SLinus Torvalds unsigned char old_state; 199e1cfcbe8SHaishuang Yan int err, tcp_fastopen; 2001da177e4SLinus Torvalds 2011da177e4SLinus Torvalds lock_sock(sk); 2021da177e4SLinus Torvalds 2031da177e4SLinus Torvalds err = -EINVAL; 2041da177e4SLinus Torvalds if (sock->state != SS_UNCONNECTED || sock->type != SOCK_STREAM) 2051da177e4SLinus Torvalds goto out; 2061da177e4SLinus Torvalds 2071da177e4SLinus Torvalds old_state = sk->sk_state; 2081da177e4SLinus Torvalds if (!((1 << old_state) & (TCPF_CLOSE | TCPF_LISTEN))) 2091da177e4SLinus Torvalds goto out; 2101da177e4SLinus Torvalds 211099ecf59SEric Dumazet WRITE_ONCE(sk->sk_max_ack_backlog, backlog); 2121da177e4SLinus Torvalds /* Really, if the socket is already in listen state 2131da177e4SLinus Torvalds * we can only allow the backlog to be adjusted. 2141da177e4SLinus Torvalds */ 2151da177e4SLinus Torvalds if (old_state != TCP_LISTEN) { 216cebc5cbaSYuchung Cheng /* Enable TFO w/o requiring TCP_FASTOPEN socket option. 2178336886fSJerry Chu * Note that only TCP sockets (SOCK_STREAM) will reach here. 218cebc5cbaSYuchung Cheng * Also fastopen backlog may already been set via the option 219cebc5cbaSYuchung Cheng * because the socket was in TCP_LISTEN state previously but 220cebc5cbaSYuchung Cheng * was shutdown() rather than close(). 2218336886fSJerry Chu */ 222e1cfcbe8SHaishuang Yan tcp_fastopen = sock_net(sk)->ipv4.sysctl_tcp_fastopen; 223e1cfcbe8SHaishuang Yan if ((tcp_fastopen & TFO_SERVER_WO_SOCKOPT1) && 224e1cfcbe8SHaishuang Yan (tcp_fastopen & TFO_SERVER_ENABLE) && 2250536fcc0SEric Dumazet !inet_csk(sk)->icsk_accept_queue.fastopenq.max_qlen) { 2260536fcc0SEric Dumazet fastopen_queue_tune(sk, backlog); 22743713848SHaishuang Yan tcp_fastopen_init_key_once(sock_net(sk)); 2288336886fSJerry Chu } 229cebc5cbaSYuchung Cheng 23072a3effaSEric Dumazet err = inet_csk_listen_start(sk, backlog); 2311da177e4SLinus Torvalds if (err) 2321da177e4SLinus Torvalds goto out; 233f333ee0cSAndrey Ignatov tcp_call_bpf(sk, BPF_SOCK_OPS_TCP_LISTEN_CB, 0, NULL); 2341da177e4SLinus Torvalds } 2351da177e4SLinus Torvalds err = 0; 2361da177e4SLinus Torvalds 2371da177e4SLinus Torvalds out: 2381da177e4SLinus Torvalds release_sock(sk); 2391da177e4SLinus Torvalds return err; 2401da177e4SLinus Torvalds } 2413d1427f8SEric Dumazet EXPORT_SYMBOL(inet_listen); 2421da177e4SLinus Torvalds 2431da177e4SLinus Torvalds /* 2441da177e4SLinus Torvalds * Create an inet socket. 2451da177e4SLinus Torvalds */ 2461da177e4SLinus Torvalds 2473f378b68SEric Paris static int inet_create(struct net *net, struct socket *sock, int protocol, 2483f378b68SEric Paris int kern) 2491da177e4SLinus Torvalds { 2501da177e4SLinus Torvalds struct sock *sk; 2511da177e4SLinus Torvalds struct inet_protosw *answer; 2521da177e4SLinus Torvalds struct inet_sock *inet; 2531da177e4SLinus Torvalds struct proto *answer_prot; 2541da177e4SLinus Torvalds unsigned char answer_flags; 255bb97d31fSArnaldo Carvalho de Melo int try_loading_module = 0; 25686c8f9d1SHerbert Xu int err; 2571da177e4SLinus Torvalds 25879462ad0SHannes Frederic Sowa if (protocol < 0 || protocol >= IPPROTO_MAX) 25979462ad0SHannes Frederic Sowa return -EINVAL; 26079462ad0SHannes Frederic Sowa 2611da177e4SLinus Torvalds sock->state = SS_UNCONNECTED; 2621da177e4SLinus Torvalds 2631da177e4SLinus Torvalds /* Look for the requested type/protocol pair. */ 264bb97d31fSArnaldo Carvalho de Melo lookup_protocol: 26586c8f9d1SHerbert Xu err = -ESOCKTNOSUPPORT; 2661da177e4SLinus Torvalds rcu_read_lock(); 267696adfe8SPaul E. McKenney list_for_each_entry_rcu(answer, &inetsw[sock->type], list) { 2681da177e4SLinus Torvalds 269696adfe8SPaul E. McKenney err = 0; 2701da177e4SLinus Torvalds /* Check the non-wild match. */ 2711da177e4SLinus Torvalds if (protocol == answer->protocol) { 2721da177e4SLinus Torvalds if (protocol != IPPROTO_IP) 2731da177e4SLinus Torvalds break; 2741da177e4SLinus Torvalds } else { 2751da177e4SLinus Torvalds /* Check for the two wild cases. */ 2761da177e4SLinus Torvalds if (IPPROTO_IP == protocol) { 2771da177e4SLinus Torvalds protocol = answer->protocol; 2781da177e4SLinus Torvalds break; 2791da177e4SLinus Torvalds } 2801da177e4SLinus Torvalds if (IPPROTO_IP == answer->protocol) 2811da177e4SLinus Torvalds break; 2821da177e4SLinus Torvalds } 28386c8f9d1SHerbert Xu err = -EPROTONOSUPPORT; 2841da177e4SLinus Torvalds } 2851da177e4SLinus Torvalds 286696adfe8SPaul E. McKenney if (unlikely(err)) { 287bb97d31fSArnaldo Carvalho de Melo if (try_loading_module < 2) { 288bb97d31fSArnaldo Carvalho de Melo rcu_read_unlock(); 289bb97d31fSArnaldo Carvalho de Melo /* 290bb97d31fSArnaldo Carvalho de Melo * Be more specific, e.g. net-pf-2-proto-132-type-1 291bb97d31fSArnaldo Carvalho de Melo * (net-pf-PF_INET-proto-IPPROTO_SCTP-type-SOCK_STREAM) 292bb97d31fSArnaldo Carvalho de Melo */ 293bb97d31fSArnaldo Carvalho de Melo if (++try_loading_module == 1) 294bb97d31fSArnaldo Carvalho de Melo request_module("net-pf-%d-proto-%d-type-%d", 295bb97d31fSArnaldo Carvalho de Melo PF_INET, protocol, sock->type); 296bb97d31fSArnaldo Carvalho de Melo /* 297bb97d31fSArnaldo Carvalho de Melo * Fall back to generic, e.g. net-pf-2-proto-132 298bb97d31fSArnaldo Carvalho de Melo * (net-pf-PF_INET-proto-IPPROTO_SCTP) 299bb97d31fSArnaldo Carvalho de Melo */ 300bb97d31fSArnaldo Carvalho de Melo else 301bb97d31fSArnaldo Carvalho de Melo request_module("net-pf-%d-proto-%d", 302bb97d31fSArnaldo Carvalho de Melo PF_INET, protocol); 303bb97d31fSArnaldo Carvalho de Melo goto lookup_protocol; 304bb97d31fSArnaldo Carvalho de Melo } else 3051da177e4SLinus Torvalds goto out_rcu_unlock; 306bb97d31fSArnaldo Carvalho de Melo } 307bb97d31fSArnaldo Carvalho de Melo 3081da177e4SLinus Torvalds err = -EPERM; 30952e804c6SEric W. Biederman if (sock->type == SOCK_RAW && !kern && 31052e804c6SEric W. Biederman !ns_capable(net->user_ns, CAP_NET_RAW)) 3111da177e4SLinus Torvalds goto out_rcu_unlock; 3121da177e4SLinus Torvalds 3131da177e4SLinus Torvalds sock->ops = answer->ops; 3141da177e4SLinus Torvalds answer_prot = answer->prot; 3151da177e4SLinus Torvalds answer_flags = answer->flags; 3161da177e4SLinus Torvalds rcu_read_unlock(); 3171da177e4SLinus Torvalds 31851456b29SIan Morris WARN_ON(!answer_prot->slab); 3191da177e4SLinus Torvalds 3201da177e4SLinus Torvalds err = -ENOBUFS; 32111aa9c28SEric W. Biederman sk = sk_alloc(net, PF_INET, GFP_KERNEL, answer_prot, kern); 32251456b29SIan Morris if (!sk) 3231da177e4SLinus Torvalds goto out; 3241da177e4SLinus Torvalds 3251da177e4SLinus Torvalds err = 0; 3261da177e4SLinus Torvalds if (INET_PROTOSW_REUSE & answer_flags) 3274a17fd52SPavel Emelyanov sk->sk_reuse = SK_CAN_REUSE; 3281da177e4SLinus Torvalds 3291da177e4SLinus Torvalds inet = inet_sk(sk); 330469de9b9SPaul Moore inet->is_icsk = (INET_PROTOSW_ICSK & answer_flags) != 0; 3311da177e4SLinus Torvalds 3327b2ff18eSJiri Olsa inet->nodefrag = 0; 3337b2ff18eSJiri Olsa 3341da177e4SLinus Torvalds if (SOCK_RAW == sock->type) { 335c720c7e8SEric Dumazet inet->inet_num = protocol; 3361da177e4SLinus Torvalds if (IPPROTO_RAW == protocol) 3371da177e4SLinus Torvalds inet->hdrincl = 1; 3381da177e4SLinus Torvalds } 3391da177e4SLinus Torvalds 340974eda11SHannes Frederic Sowa if (net->ipv4.sysctl_ip_no_pmtu_disc) 3411da177e4SLinus Torvalds inet->pmtudisc = IP_PMTUDISC_DONT; 3421da177e4SLinus Torvalds else 3431da177e4SLinus Torvalds inet->pmtudisc = IP_PMTUDISC_WANT; 3441da177e4SLinus Torvalds 345c720c7e8SEric Dumazet inet->inet_id = 0; 3461da177e4SLinus Torvalds 3471da177e4SLinus Torvalds sock_init_data(sock, sk); 3481da177e4SLinus Torvalds 3491da177e4SLinus Torvalds sk->sk_destruct = inet_sock_destruct; 3501da177e4SLinus Torvalds sk->sk_protocol = protocol; 3511da177e4SLinus Torvalds sk->sk_backlog_rcv = sk->sk_prot->backlog_rcv; 3521da177e4SLinus Torvalds 3531da177e4SLinus Torvalds inet->uc_ttl = -1; 3541da177e4SLinus Torvalds inet->mc_loop = 1; 3551da177e4SLinus Torvalds inet->mc_ttl = 1; 356f771bef9SNivedita Singhvi inet->mc_all = 1; 3571da177e4SLinus Torvalds inet->mc_index = 0; 3581da177e4SLinus Torvalds inet->mc_list = NULL; 3594c507d28SJiri Benc inet->rcv_tos = 0; 3601da177e4SLinus Torvalds 361e6848976SArnaldo Carvalho de Melo sk_refcnt_debug_inc(sk); 3621da177e4SLinus Torvalds 363c720c7e8SEric Dumazet if (inet->inet_num) { 3641da177e4SLinus Torvalds /* It assumes that any protocol which allows 3651da177e4SLinus Torvalds * the user to assign a number at socket 3661da177e4SLinus Torvalds * creation time automatically 3671da177e4SLinus Torvalds * shares. 3681da177e4SLinus Torvalds */ 369c720c7e8SEric Dumazet inet->inet_sport = htons(inet->inet_num); 3701da177e4SLinus Torvalds /* Add to protocol hash chains. */ 371086c653fSCraig Gallek err = sk->sk_prot->hash(sk); 372086c653fSCraig Gallek if (err) { 373086c653fSCraig Gallek sk_common_release(sk); 374086c653fSCraig Gallek goto out; 375086c653fSCraig Gallek } 3761da177e4SLinus Torvalds } 3771da177e4SLinus Torvalds 3781da177e4SLinus Torvalds if (sk->sk_prot->init) { 3791da177e4SLinus Torvalds err = sk->sk_prot->init(sk); 38061023658SDavid Ahern if (err) { 3811da177e4SLinus Torvalds sk_common_release(sk); 38261023658SDavid Ahern goto out; 38361023658SDavid Ahern } 38461023658SDavid Ahern } 38561023658SDavid Ahern 38661023658SDavid Ahern if (!kern) { 38761023658SDavid Ahern err = BPF_CGROUP_RUN_PROG_INET_SOCK(sk); 38861023658SDavid Ahern if (err) { 38961023658SDavid Ahern sk_common_release(sk); 39061023658SDavid Ahern goto out; 39161023658SDavid Ahern } 3921da177e4SLinus Torvalds } 3931da177e4SLinus Torvalds out: 3941da177e4SLinus Torvalds return err; 3951da177e4SLinus Torvalds out_rcu_unlock: 3961da177e4SLinus Torvalds rcu_read_unlock(); 3971da177e4SLinus Torvalds goto out; 3981da177e4SLinus Torvalds } 3991da177e4SLinus Torvalds 4001da177e4SLinus Torvalds 4011da177e4SLinus Torvalds /* 4021da177e4SLinus Torvalds * The peer socket should always be NULL (or else). When we call this 4031da177e4SLinus Torvalds * function we are destroying the object and from then on nobody 4041da177e4SLinus Torvalds * should refer to it. 4051da177e4SLinus Torvalds */ 4061da177e4SLinus Torvalds int inet_release(struct socket *sock) 4071da177e4SLinus Torvalds { 4081da177e4SLinus Torvalds struct sock *sk = sock->sk; 4091da177e4SLinus Torvalds 4101da177e4SLinus Torvalds if (sk) { 4111da177e4SLinus Torvalds long timeout; 4121da177e4SLinus Torvalds 4131da177e4SLinus Torvalds /* Applications forget to leave groups before exiting */ 4141da177e4SLinus Torvalds ip_mc_drop_socket(sk); 4151da177e4SLinus Torvalds 4161da177e4SLinus Torvalds /* If linger is set, we don't return until the close 4171da177e4SLinus Torvalds * is complete. Otherwise we return immediately. The 4181da177e4SLinus Torvalds * actually closing is done the same either way. 4191da177e4SLinus Torvalds * 4201da177e4SLinus Torvalds * If the close is due to the process exiting, we never 4211da177e4SLinus Torvalds * linger.. 4221da177e4SLinus Torvalds */ 4231da177e4SLinus Torvalds timeout = 0; 4241da177e4SLinus Torvalds if (sock_flag(sk, SOCK_LINGER) && 4251da177e4SLinus Torvalds !(current->flags & PF_EXITING)) 4261da177e4SLinus Torvalds timeout = sk->sk_lingertime; 4271da177e4SLinus Torvalds sk->sk_prot->close(sk, timeout); 4282b81f816SJakub Kicinski sock->sk = NULL; 4291da177e4SLinus Torvalds } 4301da177e4SLinus Torvalds return 0; 4311da177e4SLinus Torvalds } 4323d1427f8SEric Dumazet EXPORT_SYMBOL(inet_release); 4331da177e4SLinus Torvalds 4341da177e4SLinus Torvalds int inet_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len) 4351da177e4SLinus Torvalds { 4361da177e4SLinus Torvalds struct sock *sk = sock->sk; 4371da177e4SLinus Torvalds int err; 4381da177e4SLinus Torvalds 4391da177e4SLinus Torvalds /* If the socket has its own bind function then use it. (RAW) */ 4401da177e4SLinus Torvalds if (sk->sk_prot->bind) { 4413679d585SAndrey Ignatov return sk->sk_prot->bind(sk, uaddr, addr_len); 4421da177e4SLinus Torvalds } 4431da177e4SLinus Torvalds if (addr_len < sizeof(struct sockaddr_in)) 4443679d585SAndrey Ignatov return -EINVAL; 4451da177e4SLinus Torvalds 4464fbac77dSAndrey Ignatov /* BPF prog is run before any checks are done so that if the prog 4474fbac77dSAndrey Ignatov * changes context in a wrong way it will be caught. 4484fbac77dSAndrey Ignatov */ 4494fbac77dSAndrey Ignatov err = BPF_CGROUP_RUN_PROG_INET4_BIND(sk, uaddr); 4504fbac77dSAndrey Ignatov if (err) 4513679d585SAndrey Ignatov return err; 4523679d585SAndrey Ignatov 4533679d585SAndrey Ignatov return __inet_bind(sk, uaddr, addr_len, false, true); 4543679d585SAndrey Ignatov } 4553679d585SAndrey Ignatov EXPORT_SYMBOL(inet_bind); 4563679d585SAndrey Ignatov 4573679d585SAndrey Ignatov int __inet_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len, 4583679d585SAndrey Ignatov bool force_bind_address_no_port, bool with_lock) 4593679d585SAndrey Ignatov { 4603679d585SAndrey Ignatov struct sockaddr_in *addr = (struct sockaddr_in *)uaddr; 4611da177e4SLinus Torvalds struct inet_sock *inet = inet_sk(sk); 4621da177e4SLinus Torvalds struct net *net = sock_net(sk); 4631da177e4SLinus Torvalds unsigned short snum; 4641da177e4SLinus Torvalds int chk_addr_ret; 4651da177e4SLinus Torvalds u32 tb_id = RT_TABLE_LOCAL; 4661da177e4SLinus Torvalds int err; 4671da177e4SLinus Torvalds 468c349a528SMarcus Meissner if (addr->sin_family != AF_INET) { 46929c486dfSEric Dumazet /* Compatibility games : accept AF_UNSPEC (mapped to AF_INET) 47029c486dfSEric Dumazet * only if s_addr is INADDR_ANY. 47129c486dfSEric Dumazet */ 472c349a528SMarcus Meissner err = -EAFNOSUPPORT; 47329c486dfSEric Dumazet if (addr->sin_family != AF_UNSPEC || 47429c486dfSEric Dumazet addr->sin_addr.s_addr != htonl(INADDR_ANY)) 475d0733d2eSMarcus Meissner goto out; 476c349a528SMarcus Meissner } 477d0733d2eSMarcus Meissner 4783236b004SDavid Ahern tb_id = l3mdev_fib_table_by_index(net, sk->sk_bound_dev_if) ? : tb_id; 47930bbaa19SDavid Ahern chk_addr_ret = inet_addr_type_table(net, addr->sin_addr.s_addr, tb_id); 4801da177e4SLinus Torvalds 4811da177e4SLinus Torvalds /* Not specified by any standard per-se, however it breaks too 4821da177e4SLinus Torvalds * many applications when removed. It is unfortunate since 4831da177e4SLinus Torvalds * allowing applications to make a non-local bind solves 4841da177e4SLinus Torvalds * several problems with systems using dynamic addressing. 4851da177e4SLinus Torvalds * (ie. your servers still start up even if your ISDN link 4861da177e4SLinus Torvalds * is temporarily down) 4871da177e4SLinus Torvalds */ 4881da177e4SLinus Torvalds err = -EADDRNOTAVAIL; 48983ba4645SVincent Bernat if (!inet_can_nonlocal_bind(net, inet) && 490e6f1cebfSAl Viro addr->sin_addr.s_addr != htonl(INADDR_ANY) && 4911da177e4SLinus Torvalds chk_addr_ret != RTN_LOCAL && 4921da177e4SLinus Torvalds chk_addr_ret != RTN_MULTICAST && 4931da177e4SLinus Torvalds chk_addr_ret != RTN_BROADCAST) 4941da177e4SLinus Torvalds goto out; 4951da177e4SLinus Torvalds 4961da177e4SLinus Torvalds snum = ntohs(addr->sin_port); 4971da177e4SLinus Torvalds err = -EACCES; 49882f31ebfSMaciej Żenczykowski if (snum && inet_port_requires_bind_service(net, snum) && 4993594698aSEric W. Biederman !ns_capable(net->user_ns, CAP_NET_BIND_SERVICE)) 5001da177e4SLinus Torvalds goto out; 5011da177e4SLinus Torvalds 5021da177e4SLinus Torvalds /* We keep a pair of addresses. rcv_saddr is the one 5031da177e4SLinus Torvalds * used by hash lookups, and saddr is used for transmit. 5041da177e4SLinus Torvalds * 5051da177e4SLinus Torvalds * In the BSD API these are the same except where it 5061da177e4SLinus Torvalds * would be illegal to use them (multicast/broadcast) in 5071da177e4SLinus Torvalds * which case the sending device address is used. 5081da177e4SLinus Torvalds */ 5093679d585SAndrey Ignatov if (with_lock) 5101da177e4SLinus Torvalds lock_sock(sk); 5111da177e4SLinus Torvalds 5121da177e4SLinus Torvalds /* Check these errors (active socket, double bind). */ 5131da177e4SLinus Torvalds err = -EINVAL; 514c720c7e8SEric Dumazet if (sk->sk_state != TCP_CLOSE || inet->inet_num) 5151da177e4SLinus Torvalds goto out_release_sock; 5161da177e4SLinus Torvalds 517c720c7e8SEric Dumazet inet->inet_rcv_saddr = inet->inet_saddr = addr->sin_addr.s_addr; 5181da177e4SLinus Torvalds if (chk_addr_ret == RTN_MULTICAST || chk_addr_ret == RTN_BROADCAST) 519c720c7e8SEric Dumazet inet->inet_saddr = 0; /* Use device */ 5201da177e4SLinus Torvalds 5211da177e4SLinus Torvalds /* Make sure we are allowed to bind here. */ 522aac3fc32SAndrey Ignatov if (snum || !(inet->bind_address_no_port || 523aac3fc32SAndrey Ignatov force_bind_address_no_port)) { 524aac3fc32SAndrey Ignatov if (sk->sk_prot->get_port(sk, snum)) { 525c720c7e8SEric Dumazet inet->inet_saddr = inet->inet_rcv_saddr = 0; 5261da177e4SLinus Torvalds err = -EADDRINUSE; 5271da177e4SLinus Torvalds goto out_release_sock; 5281da177e4SLinus Torvalds } 529aac3fc32SAndrey Ignatov err = BPF_CGROUP_RUN_PROG_INET4_POST_BIND(sk); 530aac3fc32SAndrey Ignatov if (err) { 531aac3fc32SAndrey Ignatov inet->inet_saddr = inet->inet_rcv_saddr = 0; 532aac3fc32SAndrey Ignatov goto out_release_sock; 533aac3fc32SAndrey Ignatov } 534aac3fc32SAndrey Ignatov } 5351da177e4SLinus Torvalds 536c720c7e8SEric Dumazet if (inet->inet_rcv_saddr) 5371da177e4SLinus Torvalds sk->sk_userlocks |= SOCK_BINDADDR_LOCK; 5381da177e4SLinus Torvalds if (snum) 5391da177e4SLinus Torvalds sk->sk_userlocks |= SOCK_BINDPORT_LOCK; 540c720c7e8SEric Dumazet inet->inet_sport = htons(inet->inet_num); 541c720c7e8SEric Dumazet inet->inet_daddr = 0; 542c720c7e8SEric Dumazet inet->inet_dport = 0; 5431da177e4SLinus Torvalds sk_dst_reset(sk); 5441da177e4SLinus Torvalds err = 0; 5451da177e4SLinus Torvalds out_release_sock: 5463679d585SAndrey Ignatov if (with_lock) 5471da177e4SLinus Torvalds release_sock(sk); 5481da177e4SLinus Torvalds out: 5491da177e4SLinus Torvalds return err; 5501da177e4SLinus Torvalds } 5511da177e4SLinus Torvalds 5521da177e4SLinus Torvalds int inet_dgram_connect(struct socket *sock, struct sockaddr *uaddr, 5531da177e4SLinus Torvalds int addr_len, int flags) 5541da177e4SLinus Torvalds { 5551da177e4SLinus Torvalds struct sock *sk = sock->sk; 556d74bad4eSAndrey Ignatov int err; 5571da177e4SLinus Torvalds 5586503d961SChangli Gao if (addr_len < sizeof(uaddr->sa_family)) 5596503d961SChangli Gao return -EINVAL; 5601da177e4SLinus Torvalds if (uaddr->sa_family == AF_UNSPEC) 5611da177e4SLinus Torvalds return sk->sk_prot->disconnect(sk, flags); 5621da177e4SLinus Torvalds 563d74bad4eSAndrey Ignatov if (BPF_CGROUP_PRE_CONNECT_ENABLED(sk)) { 564d74bad4eSAndrey Ignatov err = sk->sk_prot->pre_connect(sk, uaddr, addr_len); 565d74bad4eSAndrey Ignatov if (err) 566d74bad4eSAndrey Ignatov return err; 567d74bad4eSAndrey Ignatov } 568d74bad4eSAndrey Ignatov 569c720c7e8SEric Dumazet if (!inet_sk(sk)->inet_num && inet_autobind(sk)) 5701da177e4SLinus Torvalds return -EAGAIN; 571e3192690SJoe Perches return sk->sk_prot->connect(sk, uaddr, addr_len); 5721da177e4SLinus Torvalds } 5733d1427f8SEric Dumazet EXPORT_SYMBOL(inet_dgram_connect); 5741da177e4SLinus Torvalds 575783237e8SYuchung Cheng static long inet_wait_for_connect(struct sock *sk, long timeo, int writebias) 5761da177e4SLinus Torvalds { 57714135f30SWANG Cong DEFINE_WAIT_FUNC(wait, woken_wake_function); 5781da177e4SLinus Torvalds 57914135f30SWANG Cong add_wait_queue(sk_sleep(sk), &wait); 580783237e8SYuchung Cheng sk->sk_write_pending += writebias; 5811da177e4SLinus Torvalds 5821da177e4SLinus Torvalds /* Basic assumption: if someone sets sk->sk_err, he _must_ 5831da177e4SLinus Torvalds * change state of the socket from TCP_SYN_*. 5841da177e4SLinus Torvalds * Connect() does not allow to get error notifications 5851da177e4SLinus Torvalds * without closing the socket. 5861da177e4SLinus Torvalds */ 5871da177e4SLinus Torvalds while ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV)) { 5881da177e4SLinus Torvalds release_sock(sk); 58914135f30SWANG Cong timeo = wait_woken(&wait, TASK_INTERRUPTIBLE, timeo); 5901da177e4SLinus Torvalds lock_sock(sk); 5911da177e4SLinus Torvalds if (signal_pending(current) || !timeo) 5921da177e4SLinus Torvalds break; 5931da177e4SLinus Torvalds } 59414135f30SWANG Cong remove_wait_queue(sk_sleep(sk), &wait); 595783237e8SYuchung Cheng sk->sk_write_pending -= writebias; 5961da177e4SLinus Torvalds return timeo; 5971da177e4SLinus Torvalds } 5981da177e4SLinus Torvalds 5991da177e4SLinus Torvalds /* 6001da177e4SLinus Torvalds * Connect to a remote host. There is regrettably still a little 6011da177e4SLinus Torvalds * TCP 'magic' in here. 6021da177e4SLinus Torvalds */ 603cf60af03SYuchung Cheng int __inet_stream_connect(struct socket *sock, struct sockaddr *uaddr, 6043979ad7eSWilly Tarreau int addr_len, int flags, int is_sendmsg) 6051da177e4SLinus Torvalds { 6061da177e4SLinus Torvalds struct sock *sk = sock->sk; 6071da177e4SLinus Torvalds int err; 6081da177e4SLinus Torvalds long timeo; 6091da177e4SLinus Torvalds 61019f6d3f3SWei Wang /* 61119f6d3f3SWei Wang * uaddr can be NULL and addr_len can be 0 if: 61219f6d3f3SWei Wang * sk is a TCP fastopen active socket and 61319f6d3f3SWei Wang * TCP_FASTOPEN_CONNECT sockopt is set and 61419f6d3f3SWei Wang * we already have a valid cookie for this socket. 61519f6d3f3SWei Wang * In this case, user can call write() after connect(). 61619f6d3f3SWei Wang * write() will invoke tcp_sendmsg_fastopen() which calls 61719f6d3f3SWei Wang * __inet_stream_connect(). 61819f6d3f3SWei Wang */ 61919f6d3f3SWei Wang if (uaddr) { 6206503d961SChangli Gao if (addr_len < sizeof(uaddr->sa_family)) 6216503d961SChangli Gao return -EINVAL; 6226503d961SChangli Gao 6231da177e4SLinus Torvalds if (uaddr->sa_family == AF_UNSPEC) { 6241da177e4SLinus Torvalds err = sk->sk_prot->disconnect(sk, flags); 6251da177e4SLinus Torvalds sock->state = err ? SS_DISCONNECTING : SS_UNCONNECTED; 6261da177e4SLinus Torvalds goto out; 6271da177e4SLinus Torvalds } 62819f6d3f3SWei Wang } 6291da177e4SLinus Torvalds 6301da177e4SLinus Torvalds switch (sock->state) { 6311da177e4SLinus Torvalds default: 6321da177e4SLinus Torvalds err = -EINVAL; 6331da177e4SLinus Torvalds goto out; 6341da177e4SLinus Torvalds case SS_CONNECTED: 6351da177e4SLinus Torvalds err = -EISCONN; 6361da177e4SLinus Torvalds goto out; 6371da177e4SLinus Torvalds case SS_CONNECTING: 63819f6d3f3SWei Wang if (inet_sk(sk)->defer_connect) 6393979ad7eSWilly Tarreau err = is_sendmsg ? -EINPROGRESS : -EISCONN; 64019f6d3f3SWei Wang else 6411da177e4SLinus Torvalds err = -EALREADY; 6421da177e4SLinus Torvalds /* Fall out of switch with err, set for this state */ 6431da177e4SLinus Torvalds break; 6441da177e4SLinus Torvalds case SS_UNCONNECTED: 6451da177e4SLinus Torvalds err = -EISCONN; 6461da177e4SLinus Torvalds if (sk->sk_state != TCP_CLOSE) 6471da177e4SLinus Torvalds goto out; 6481da177e4SLinus Torvalds 649d74bad4eSAndrey Ignatov if (BPF_CGROUP_PRE_CONNECT_ENABLED(sk)) { 650d74bad4eSAndrey Ignatov err = sk->sk_prot->pre_connect(sk, uaddr, addr_len); 651d74bad4eSAndrey Ignatov if (err) 652d74bad4eSAndrey Ignatov goto out; 653d74bad4eSAndrey Ignatov } 654d74bad4eSAndrey Ignatov 6551da177e4SLinus Torvalds err = sk->sk_prot->connect(sk, uaddr, addr_len); 6561da177e4SLinus Torvalds if (err < 0) 6571da177e4SLinus Torvalds goto out; 6581da177e4SLinus Torvalds 6591da177e4SLinus Torvalds sock->state = SS_CONNECTING; 6601da177e4SLinus Torvalds 66119f6d3f3SWei Wang if (!err && inet_sk(sk)->defer_connect) 66219f6d3f3SWei Wang goto out; 66319f6d3f3SWei Wang 6641da177e4SLinus Torvalds /* Just entered SS_CONNECTING state; the only 6651da177e4SLinus Torvalds * difference is that return value in non-blocking 6661da177e4SLinus Torvalds * case is EINPROGRESS, rather than EALREADY. 6671da177e4SLinus Torvalds */ 6681da177e4SLinus Torvalds err = -EINPROGRESS; 6691da177e4SLinus Torvalds break; 6701da177e4SLinus Torvalds } 6711da177e4SLinus Torvalds 6721da177e4SLinus Torvalds timeo = sock_sndtimeo(sk, flags & O_NONBLOCK); 6731da177e4SLinus Torvalds 6741da177e4SLinus Torvalds if ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV)) { 675783237e8SYuchung Cheng int writebias = (sk->sk_protocol == IPPROTO_TCP) && 676783237e8SYuchung Cheng tcp_sk(sk)->fastopen_req && 677783237e8SYuchung Cheng tcp_sk(sk)->fastopen_req->data ? 1 : 0; 678783237e8SYuchung Cheng 6791da177e4SLinus Torvalds /* Error code is set above */ 680783237e8SYuchung Cheng if (!timeo || !inet_wait_for_connect(sk, timeo, writebias)) 6811da177e4SLinus Torvalds goto out; 6821da177e4SLinus Torvalds 6831da177e4SLinus Torvalds err = sock_intr_errno(timeo); 6841da177e4SLinus Torvalds if (signal_pending(current)) 6851da177e4SLinus Torvalds goto out; 6861da177e4SLinus Torvalds } 6871da177e4SLinus Torvalds 6881da177e4SLinus Torvalds /* Connection was closed by RST, timeout, ICMP error 6891da177e4SLinus Torvalds * or another process disconnected us. 6901da177e4SLinus Torvalds */ 6911da177e4SLinus Torvalds if (sk->sk_state == TCP_CLOSE) 6921da177e4SLinus Torvalds goto sock_error; 6931da177e4SLinus Torvalds 6941da177e4SLinus Torvalds /* sk->sk_err may be not zero now, if RECVERR was ordered by user 6951da177e4SLinus Torvalds * and error was received after socket entered established state. 6961da177e4SLinus Torvalds * Hence, it is handled normally after connect() return successfully. 6971da177e4SLinus Torvalds */ 6981da177e4SLinus Torvalds 6991da177e4SLinus Torvalds sock->state = SS_CONNECTED; 7001da177e4SLinus Torvalds err = 0; 7011da177e4SLinus Torvalds out: 7021da177e4SLinus Torvalds return err; 7031da177e4SLinus Torvalds 7041da177e4SLinus Torvalds sock_error: 7051da177e4SLinus Torvalds err = sock_error(sk) ? : -ECONNABORTED; 7061da177e4SLinus Torvalds sock->state = SS_UNCONNECTED; 7071da177e4SLinus Torvalds if (sk->sk_prot->disconnect(sk, flags)) 7081da177e4SLinus Torvalds sock->state = SS_DISCONNECTING; 7091da177e4SLinus Torvalds goto out; 7101da177e4SLinus Torvalds } 711cf60af03SYuchung Cheng EXPORT_SYMBOL(__inet_stream_connect); 712cf60af03SYuchung Cheng 713cf60af03SYuchung Cheng int inet_stream_connect(struct socket *sock, struct sockaddr *uaddr, 714cf60af03SYuchung Cheng int addr_len, int flags) 715cf60af03SYuchung Cheng { 716cf60af03SYuchung Cheng int err; 717cf60af03SYuchung Cheng 718cf60af03SYuchung Cheng lock_sock(sock->sk); 7193979ad7eSWilly Tarreau err = __inet_stream_connect(sock, uaddr, addr_len, flags, 0); 720cf60af03SYuchung Cheng release_sock(sock->sk); 721cf60af03SYuchung Cheng return err; 722cf60af03SYuchung Cheng } 7233d1427f8SEric Dumazet EXPORT_SYMBOL(inet_stream_connect); 7241da177e4SLinus Torvalds 7251da177e4SLinus Torvalds /* 7261da177e4SLinus Torvalds * Accept a pending connection. The TCP layer now gives BSD semantics. 7271da177e4SLinus Torvalds */ 7281da177e4SLinus Torvalds 729cdfbabfbSDavid Howells int inet_accept(struct socket *sock, struct socket *newsock, int flags, 730cdfbabfbSDavid Howells bool kern) 7311da177e4SLinus Torvalds { 7321da177e4SLinus Torvalds struct sock *sk1 = sock->sk; 7331da177e4SLinus Torvalds int err = -EINVAL; 734cdfbabfbSDavid Howells struct sock *sk2 = sk1->sk_prot->accept(sk1, flags, &err, kern); 7351da177e4SLinus Torvalds 7361da177e4SLinus Torvalds if (!sk2) 7371da177e4SLinus Torvalds goto do_err; 7381da177e4SLinus Torvalds 7391da177e4SLinus Torvalds lock_sock(sk2); 7401da177e4SLinus Torvalds 7411eddceadSEric Dumazet sock_rps_record_flow(sk2); 742547b792cSIlpo Järvinen WARN_ON(!((1 << sk2->sk_state) & 7438336886fSJerry Chu (TCPF_ESTABLISHED | TCPF_SYN_RECV | 7448336886fSJerry Chu TCPF_CLOSE_WAIT | TCPF_CLOSE))); 7451da177e4SLinus Torvalds 7461da177e4SLinus Torvalds sock_graft(sk2, newsock); 7471da177e4SLinus Torvalds 7481da177e4SLinus Torvalds newsock->state = SS_CONNECTED; 7491da177e4SLinus Torvalds err = 0; 7501da177e4SLinus Torvalds release_sock(sk2); 7511da177e4SLinus Torvalds do_err: 7521da177e4SLinus Torvalds return err; 7531da177e4SLinus Torvalds } 7543d1427f8SEric Dumazet EXPORT_SYMBOL(inet_accept); 7551da177e4SLinus Torvalds 7561da177e4SLinus Torvalds 7571da177e4SLinus Torvalds /* 7581da177e4SLinus Torvalds * This does both peername and sockname. 7591da177e4SLinus Torvalds */ 7601da177e4SLinus Torvalds int inet_getname(struct socket *sock, struct sockaddr *uaddr, 7619b2c45d4SDenys Vlasenko int peer) 7621da177e4SLinus Torvalds { 7631da177e4SLinus Torvalds struct sock *sk = sock->sk; 7641da177e4SLinus Torvalds struct inet_sock *inet = inet_sk(sk); 76538bfd8f5SCyrill Gorcunov DECLARE_SOCKADDR(struct sockaddr_in *, sin, uaddr); 7661da177e4SLinus Torvalds 7671da177e4SLinus Torvalds sin->sin_family = AF_INET; 7681da177e4SLinus Torvalds if (peer) { 769c720c7e8SEric Dumazet if (!inet->inet_dport || 7701da177e4SLinus Torvalds (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) && 7711da177e4SLinus Torvalds peer == 1)) 7721da177e4SLinus Torvalds return -ENOTCONN; 773c720c7e8SEric Dumazet sin->sin_port = inet->inet_dport; 774c720c7e8SEric Dumazet sin->sin_addr.s_addr = inet->inet_daddr; 7751da177e4SLinus Torvalds } else { 776c720c7e8SEric Dumazet __be32 addr = inet->inet_rcv_saddr; 7771da177e4SLinus Torvalds if (!addr) 778c720c7e8SEric Dumazet addr = inet->inet_saddr; 779c720c7e8SEric Dumazet sin->sin_port = inet->inet_sport; 7801da177e4SLinus Torvalds sin->sin_addr.s_addr = addr; 7811da177e4SLinus Torvalds } 7821da177e4SLinus Torvalds memset(sin->sin_zero, 0, sizeof(sin->sin_zero)); 7839b2c45d4SDenys Vlasenko return sizeof(*sin); 7841da177e4SLinus Torvalds } 7853d1427f8SEric Dumazet EXPORT_SYMBOL(inet_getname); 7861da177e4SLinus Torvalds 787e4730936SPaolo Abeni int inet_send_prepare(struct sock *sk) 7881da177e4SLinus Torvalds { 789c58dc01bSDavid S. Miller sock_rps_record_flow(sk); 790fec5e652STom Herbert 7911da177e4SLinus Torvalds /* We may need to bind the socket. */ 7927ba42910SChangli Gao if (!inet_sk(sk)->inet_num && !sk->sk_prot->no_autobind && 7937ba42910SChangli Gao inet_autobind(sk)) 7941da177e4SLinus Torvalds return -EAGAIN; 7951da177e4SLinus Torvalds 796e4730936SPaolo Abeni return 0; 797e4730936SPaolo Abeni } 798e4730936SPaolo Abeni EXPORT_SYMBOL_GPL(inet_send_prepare); 799e4730936SPaolo Abeni 800e4730936SPaolo Abeni int inet_sendmsg(struct socket *sock, struct msghdr *msg, size_t size) 801e4730936SPaolo Abeni { 802e4730936SPaolo Abeni struct sock *sk = sock->sk; 803e4730936SPaolo Abeni 804e4730936SPaolo Abeni if (unlikely(inet_send_prepare(sk))) 805e4730936SPaolo Abeni return -EAGAIN; 806e4730936SPaolo Abeni 8076f24080eSPaolo Abeni return INDIRECT_CALL_2(sk->sk_prot->sendmsg, tcp_sendmsg, udp_sendmsg, 8086f24080eSPaolo Abeni sk, msg, size); 8091da177e4SLinus Torvalds } 8103d1427f8SEric Dumazet EXPORT_SYMBOL(inet_sendmsg); 8111da177e4SLinus Torvalds 8127ba42910SChangli Gao ssize_t inet_sendpage(struct socket *sock, struct page *page, int offset, 8133d1427f8SEric Dumazet size_t size, int flags) 8141da177e4SLinus Torvalds { 8151da177e4SLinus Torvalds struct sock *sk = sock->sk; 8161da177e4SLinus Torvalds 817e4730936SPaolo Abeni if (unlikely(inet_send_prepare(sk))) 8181da177e4SLinus Torvalds return -EAGAIN; 8191da177e4SLinus Torvalds 8201da177e4SLinus Torvalds if (sk->sk_prot->sendpage) 8211da177e4SLinus Torvalds return sk->sk_prot->sendpage(sk, page, offset, size, flags); 8221da177e4SLinus Torvalds return sock_no_sendpage(sock, page, offset, size, flags); 8231da177e4SLinus Torvalds } 8247ba42910SChangli Gao EXPORT_SYMBOL(inet_sendpage); 8251da177e4SLinus Torvalds 8266f24080eSPaolo Abeni INDIRECT_CALLABLE_DECLARE(int udp_recvmsg(struct sock *, struct msghdr *, 8276f24080eSPaolo Abeni size_t, int, int, int *)); 8281b784140SYing Xue int inet_recvmsg(struct socket *sock, struct msghdr *msg, size_t size, 8291b784140SYing Xue int flags) 830fec5e652STom Herbert { 831fec5e652STom Herbert struct sock *sk = sock->sk; 832fec5e652STom Herbert int addr_len = 0; 833fec5e652STom Herbert int err; 834fec5e652STom Herbert 835e3f2c4a3SSoheil Hassas Yeganeh if (likely(!(flags & MSG_ERRQUEUE))) 836c58dc01bSDavid S. Miller sock_rps_record_flow(sk); 837fec5e652STom Herbert 8386f24080eSPaolo Abeni err = INDIRECT_CALL_2(sk->sk_prot->recvmsg, tcp_recvmsg, udp_recvmsg, 8396f24080eSPaolo Abeni sk, msg, size, flags & MSG_DONTWAIT, 840fec5e652STom Herbert flags & ~MSG_DONTWAIT, &addr_len); 841fec5e652STom Herbert if (err >= 0) 842fec5e652STom Herbert msg->msg_namelen = addr_len; 843fec5e652STom Herbert return err; 844fec5e652STom Herbert } 845fec5e652STom Herbert EXPORT_SYMBOL(inet_recvmsg); 8461da177e4SLinus Torvalds 8471da177e4SLinus Torvalds int inet_shutdown(struct socket *sock, int how) 8481da177e4SLinus Torvalds { 8491da177e4SLinus Torvalds struct sock *sk = sock->sk; 8501da177e4SLinus Torvalds int err = 0; 8511da177e4SLinus Torvalds 8521da177e4SLinus Torvalds /* This should really check to make sure 8531da177e4SLinus Torvalds * the socket is a TCP socket. (WHY AC...) 8541da177e4SLinus Torvalds */ 8551da177e4SLinus Torvalds how++; /* maps 0->1 has the advantage of making bit 1 rcvs and 8561da177e4SLinus Torvalds 1->2 bit 2 snds. 8571da177e4SLinus Torvalds 2->3 */ 8581da177e4SLinus Torvalds if ((how & ~SHUTDOWN_MASK) || !how) /* MAXINT->0 */ 8591da177e4SLinus Torvalds return -EINVAL; 8601da177e4SLinus Torvalds 8611da177e4SLinus Torvalds lock_sock(sk); 8621da177e4SLinus Torvalds if (sock->state == SS_CONNECTING) { 8631da177e4SLinus Torvalds if ((1 << sk->sk_state) & 8641da177e4SLinus Torvalds (TCPF_SYN_SENT | TCPF_SYN_RECV | TCPF_CLOSE)) 8651da177e4SLinus Torvalds sock->state = SS_DISCONNECTING; 8661da177e4SLinus Torvalds else 8671da177e4SLinus Torvalds sock->state = SS_CONNECTED; 8681da177e4SLinus Torvalds } 8691da177e4SLinus Torvalds 8701da177e4SLinus Torvalds switch (sk->sk_state) { 8711da177e4SLinus Torvalds case TCP_CLOSE: 8721da177e4SLinus Torvalds err = -ENOTCONN; 8731da177e4SLinus Torvalds /* Hack to wake up other listeners, who can poll for 874a9a08845SLinus Torvalds EPOLLHUP, even on eg. unconnected UDP sockets -- RR */ 875a8eceea8SJoe Perches fallthrough; 8761da177e4SLinus Torvalds default: 8771da177e4SLinus Torvalds sk->sk_shutdown |= how; 8781da177e4SLinus Torvalds if (sk->sk_prot->shutdown) 8791da177e4SLinus Torvalds sk->sk_prot->shutdown(sk, how); 8801da177e4SLinus Torvalds break; 8811da177e4SLinus Torvalds 8821da177e4SLinus Torvalds /* Remaining two branches are temporary solution for missing 8831da177e4SLinus Torvalds * close() in multithreaded environment. It is _not_ a good idea, 8841da177e4SLinus Torvalds * but we have no choice until close() is repaired at VFS level. 8851da177e4SLinus Torvalds */ 8861da177e4SLinus Torvalds case TCP_LISTEN: 8871da177e4SLinus Torvalds if (!(how & RCV_SHUTDOWN)) 8881da177e4SLinus Torvalds break; 889a8eceea8SJoe Perches fallthrough; 8901da177e4SLinus Torvalds case TCP_SYN_SENT: 8911da177e4SLinus Torvalds err = sk->sk_prot->disconnect(sk, O_NONBLOCK); 8921da177e4SLinus Torvalds sock->state = err ? SS_DISCONNECTING : SS_UNCONNECTED; 8931da177e4SLinus Torvalds break; 8941da177e4SLinus Torvalds } 8951da177e4SLinus Torvalds 8961da177e4SLinus Torvalds /* Wake up anyone sleeping in poll. */ 8971da177e4SLinus Torvalds sk->sk_state_change(sk); 8981da177e4SLinus Torvalds release_sock(sk); 8991da177e4SLinus Torvalds return err; 9001da177e4SLinus Torvalds } 9013d1427f8SEric Dumazet EXPORT_SYMBOL(inet_shutdown); 9021da177e4SLinus Torvalds 9031da177e4SLinus Torvalds /* 9041da177e4SLinus Torvalds * ioctl() calls you can issue on an INET socket. Most of these are 9051da177e4SLinus Torvalds * device configuration and stuff and very rarely used. Some ioctls 9061da177e4SLinus Torvalds * pass on to the socket itself. 9071da177e4SLinus Torvalds * 9081da177e4SLinus Torvalds * NOTE: I like the idea of a module for the config stuff. ie ifconfig 9091da177e4SLinus Torvalds * loads the devconfigure module does its configuring and unloads it. 9101da177e4SLinus Torvalds * There's a good 20K of config code hanging around the kernel. 9111da177e4SLinus Torvalds */ 9121da177e4SLinus Torvalds 9131da177e4SLinus Torvalds int inet_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 9141da177e4SLinus Torvalds { 9151da177e4SLinus Torvalds struct sock *sk = sock->sk; 9161da177e4SLinus Torvalds int err = 0; 9173b1e0a65SYOSHIFUJI Hideaki struct net *net = sock_net(sk); 91803aef17bSAl Viro void __user *p = (void __user *)arg; 91903aef17bSAl Viro struct ifreq ifr; 920ca25c300SAl Viro struct rtentry rt; 9211da177e4SLinus Torvalds 9221da177e4SLinus Torvalds switch (cmd) { 9231da177e4SLinus Torvalds case SIOCADDRT: 9241da177e4SLinus Torvalds case SIOCDELRT: 925ca25c300SAl Viro if (copy_from_user(&rt, p, sizeof(struct rtentry))) 926ca25c300SAl Viro return -EFAULT; 927ca25c300SAl Viro err = ip_rt_ioctl(net, cmd, &rt); 928ca25c300SAl Viro break; 9291da177e4SLinus Torvalds case SIOCRTMSG: 930ca25c300SAl Viro err = -EINVAL; 9311da177e4SLinus Torvalds break; 9321da177e4SLinus Torvalds case SIOCDARP: 9331da177e4SLinus Torvalds case SIOCGARP: 9341da177e4SLinus Torvalds case SIOCSARP: 935e5b13cb1SDenis V. Lunev err = arp_ioctl(net, cmd, (void __user *)arg); 9361da177e4SLinus Torvalds break; 9371da177e4SLinus Torvalds case SIOCGIFADDR: 9381da177e4SLinus Torvalds case SIOCGIFBRDADDR: 9391da177e4SLinus Torvalds case SIOCGIFNETMASK: 9401da177e4SLinus Torvalds case SIOCGIFDSTADDR: 94103aef17bSAl Viro case SIOCGIFPFLAGS: 94203aef17bSAl Viro if (copy_from_user(&ifr, p, sizeof(struct ifreq))) 94303aef17bSAl Viro return -EFAULT; 94403aef17bSAl Viro err = devinet_ioctl(net, cmd, &ifr); 94503aef17bSAl Viro if (!err && copy_to_user(p, &ifr, sizeof(struct ifreq))) 94603aef17bSAl Viro err = -EFAULT; 94703aef17bSAl Viro break; 94803aef17bSAl Viro 94903aef17bSAl Viro case SIOCSIFADDR: 95003aef17bSAl Viro case SIOCSIFBRDADDR: 95103aef17bSAl Viro case SIOCSIFNETMASK: 9521da177e4SLinus Torvalds case SIOCSIFDSTADDR: 9531da177e4SLinus Torvalds case SIOCSIFPFLAGS: 9541da177e4SLinus Torvalds case SIOCSIFFLAGS: 95503aef17bSAl Viro if (copy_from_user(&ifr, p, sizeof(struct ifreq))) 95603aef17bSAl Viro return -EFAULT; 95703aef17bSAl Viro err = devinet_ioctl(net, cmd, &ifr); 9581da177e4SLinus Torvalds break; 9591da177e4SLinus Torvalds default: 960b5e5fa5eSChristoph Hellwig if (sk->sk_prot->ioctl) 961b5e5fa5eSChristoph Hellwig err = sk->sk_prot->ioctl(sk, cmd, arg); 962b5e5fa5eSChristoph Hellwig else 963b5e5fa5eSChristoph Hellwig err = -ENOIOCTLCMD; 9641da177e4SLinus Torvalds break; 9651da177e4SLinus Torvalds } 9661da177e4SLinus Torvalds return err; 9671da177e4SLinus Torvalds } 9683d1427f8SEric Dumazet EXPORT_SYMBOL(inet_ioctl); 9691da177e4SLinus Torvalds 970709b46e8SEric W. Biederman #ifdef CONFIG_COMPAT 971686dc6b6SGerrit Renker static int inet_compat_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 972709b46e8SEric W. Biederman { 973709b46e8SEric W. Biederman struct sock *sk = sock->sk; 974709b46e8SEric W. Biederman int err = -ENOIOCTLCMD; 975709b46e8SEric W. Biederman 976709b46e8SEric W. Biederman if (sk->sk_prot->compat_ioctl) 977709b46e8SEric W. Biederman err = sk->sk_prot->compat_ioctl(sk, cmd, arg); 978709b46e8SEric W. Biederman 979709b46e8SEric W. Biederman return err; 980709b46e8SEric W. Biederman } 981709b46e8SEric W. Biederman #endif 982709b46e8SEric W. Biederman 98390ddc4f0SEric Dumazet const struct proto_ops inet_stream_ops = { 9841da177e4SLinus Torvalds .family = PF_INET, 9851da177e4SLinus Torvalds .owner = THIS_MODULE, 9861da177e4SLinus Torvalds .release = inet_release, 9871da177e4SLinus Torvalds .bind = inet_bind, 9881da177e4SLinus Torvalds .connect = inet_stream_connect, 9891da177e4SLinus Torvalds .socketpair = sock_no_socketpair, 9901da177e4SLinus Torvalds .accept = inet_accept, 9911da177e4SLinus Torvalds .getname = inet_getname, 992a11e1d43SLinus Torvalds .poll = tcp_poll, 9931da177e4SLinus Torvalds .ioctl = inet_ioctl, 994c7cbdbf2SArnd Bergmann .gettstamp = sock_gettstamp, 9951da177e4SLinus Torvalds .listen = inet_listen, 9961da177e4SLinus Torvalds .shutdown = inet_shutdown, 9971da177e4SLinus Torvalds .setsockopt = sock_common_setsockopt, 9981da177e4SLinus Torvalds .getsockopt = sock_common_getsockopt, 9997ba42910SChangli Gao .sendmsg = inet_sendmsg, 1000fec5e652STom Herbert .recvmsg = inet_recvmsg, 100105255b82SEric Dumazet #ifdef CONFIG_MMU 100293ab6cc6SEric Dumazet .mmap = tcp_mmap, 100305255b82SEric Dumazet #endif 10047ba42910SChangli Gao .sendpage = inet_sendpage, 10059c55e01cSJens Axboe .splice_read = tcp_splice_read, 100632035585STom Herbert .read_sock = tcp_read_sock, 1007306b13ebSTom Herbert .sendmsg_locked = tcp_sendmsg_locked, 1008306b13ebSTom Herbert .sendpage_locked = tcp_sendpage_locked, 100932035585STom Herbert .peek_len = tcp_peek_len, 10103fdadf7dSDmitry Mishin #ifdef CONFIG_COMPAT 10113fdadf7dSDmitry Mishin .compat_setsockopt = compat_sock_common_setsockopt, 10123fdadf7dSDmitry Mishin .compat_getsockopt = compat_sock_common_getsockopt, 1013709b46e8SEric W. Biederman .compat_ioctl = inet_compat_ioctl, 10143fdadf7dSDmitry Mishin #endif 1015d1361840SEric Dumazet .set_rcvlowat = tcp_set_rcvlowat, 10161da177e4SLinus Torvalds }; 10173d1427f8SEric Dumazet EXPORT_SYMBOL(inet_stream_ops); 10181da177e4SLinus Torvalds 101990ddc4f0SEric Dumazet const struct proto_ops inet_dgram_ops = { 10201da177e4SLinus Torvalds .family = PF_INET, 10211da177e4SLinus Torvalds .owner = THIS_MODULE, 10221da177e4SLinus Torvalds .release = inet_release, 10231da177e4SLinus Torvalds .bind = inet_bind, 10241da177e4SLinus Torvalds .connect = inet_dgram_connect, 10251da177e4SLinus Torvalds .socketpair = sock_no_socketpair, 10261da177e4SLinus Torvalds .accept = sock_no_accept, 10271da177e4SLinus Torvalds .getname = inet_getname, 1028a11e1d43SLinus Torvalds .poll = udp_poll, 10291da177e4SLinus Torvalds .ioctl = inet_ioctl, 1030c7cbdbf2SArnd Bergmann .gettstamp = sock_gettstamp, 10311da177e4SLinus Torvalds .listen = sock_no_listen, 10321da177e4SLinus Torvalds .shutdown = inet_shutdown, 10331da177e4SLinus Torvalds .setsockopt = sock_common_setsockopt, 10341da177e4SLinus Torvalds .getsockopt = sock_common_getsockopt, 10351da177e4SLinus Torvalds .sendmsg = inet_sendmsg, 1036fec5e652STom Herbert .recvmsg = inet_recvmsg, 10371da177e4SLinus Torvalds .mmap = sock_no_mmap, 10381da177e4SLinus Torvalds .sendpage = inet_sendpage, 1039627d2d6bSsamanthakumar .set_peek_off = sk_set_peek_off, 1040543d9cfeSArnaldo Carvalho de Melo #ifdef CONFIG_COMPAT 1041543d9cfeSArnaldo Carvalho de Melo .compat_setsockopt = compat_sock_common_setsockopt, 1042543d9cfeSArnaldo Carvalho de Melo .compat_getsockopt = compat_sock_common_getsockopt, 1043709b46e8SEric W. Biederman .compat_ioctl = inet_compat_ioctl, 1044543d9cfeSArnaldo Carvalho de Melo #endif 10451da177e4SLinus Torvalds }; 10463d1427f8SEric Dumazet EXPORT_SYMBOL(inet_dgram_ops); 10471da177e4SLinus Torvalds 10481da177e4SLinus Torvalds /* 10491da177e4SLinus Torvalds * For SOCK_RAW sockets; should be the same as inet_dgram_ops but without 1050a11e1d43SLinus Torvalds * udp_poll 10511da177e4SLinus Torvalds */ 105290ddc4f0SEric Dumazet static const struct proto_ops inet_sockraw_ops = { 10531da177e4SLinus Torvalds .family = PF_INET, 10541da177e4SLinus Torvalds .owner = THIS_MODULE, 10551da177e4SLinus Torvalds .release = inet_release, 10561da177e4SLinus Torvalds .bind = inet_bind, 10571da177e4SLinus Torvalds .connect = inet_dgram_connect, 10581da177e4SLinus Torvalds .socketpair = sock_no_socketpair, 10591da177e4SLinus Torvalds .accept = sock_no_accept, 10601da177e4SLinus Torvalds .getname = inet_getname, 1061a11e1d43SLinus Torvalds .poll = datagram_poll, 10621da177e4SLinus Torvalds .ioctl = inet_ioctl, 1063c7cbdbf2SArnd Bergmann .gettstamp = sock_gettstamp, 10641da177e4SLinus Torvalds .listen = sock_no_listen, 10651da177e4SLinus Torvalds .shutdown = inet_shutdown, 10661da177e4SLinus Torvalds .setsockopt = sock_common_setsockopt, 10671da177e4SLinus Torvalds .getsockopt = sock_common_getsockopt, 10681da177e4SLinus Torvalds .sendmsg = inet_sendmsg, 1069fec5e652STom Herbert .recvmsg = inet_recvmsg, 10701da177e4SLinus Torvalds .mmap = sock_no_mmap, 10711da177e4SLinus Torvalds .sendpage = inet_sendpage, 1072543d9cfeSArnaldo Carvalho de Melo #ifdef CONFIG_COMPAT 1073543d9cfeSArnaldo Carvalho de Melo .compat_setsockopt = compat_sock_common_setsockopt, 1074543d9cfeSArnaldo Carvalho de Melo .compat_getsockopt = compat_sock_common_getsockopt, 1075709b46e8SEric W. Biederman .compat_ioctl = inet_compat_ioctl, 1076543d9cfeSArnaldo Carvalho de Melo #endif 10771da177e4SLinus Torvalds }; 10781da177e4SLinus Torvalds 1079ec1b4cf7SStephen Hemminger static const struct net_proto_family inet_family_ops = { 10801da177e4SLinus Torvalds .family = PF_INET, 10811da177e4SLinus Torvalds .create = inet_create, 10821da177e4SLinus Torvalds .owner = THIS_MODULE, 10831da177e4SLinus Torvalds }; 10841da177e4SLinus Torvalds 10851da177e4SLinus Torvalds /* Upon startup we insert all the elements in inetsw_array[] into 10861da177e4SLinus Torvalds * the linked list inetsw. 10871da177e4SLinus Torvalds */ 10881da177e4SLinus Torvalds static struct inet_protosw inetsw_array[] = 10891da177e4SLinus Torvalds { 10901da177e4SLinus Torvalds { 10911da177e4SLinus Torvalds .type = SOCK_STREAM, 10921da177e4SLinus Torvalds .protocol = IPPROTO_TCP, 10931da177e4SLinus Torvalds .prot = &tcp_prot, 10941da177e4SLinus Torvalds .ops = &inet_stream_ops, 1095d83d8461SArnaldo Carvalho de Melo .flags = INET_PROTOSW_PERMANENT | 1096d83d8461SArnaldo Carvalho de Melo INET_PROTOSW_ICSK, 10971da177e4SLinus Torvalds }, 10981da177e4SLinus Torvalds 10991da177e4SLinus Torvalds { 11001da177e4SLinus Torvalds .type = SOCK_DGRAM, 11011da177e4SLinus Torvalds .protocol = IPPROTO_UDP, 11021da177e4SLinus Torvalds .prot = &udp_prot, 11031da177e4SLinus Torvalds .ops = &inet_dgram_ops, 11041da177e4SLinus Torvalds .flags = INET_PROTOSW_PERMANENT, 11051da177e4SLinus Torvalds }, 11061da177e4SLinus Torvalds 1107c319b4d7SVasiliy Kulikov { 1108c319b4d7SVasiliy Kulikov .type = SOCK_DGRAM, 1109c319b4d7SVasiliy Kulikov .protocol = IPPROTO_ICMP, 1110c319b4d7SVasiliy Kulikov .prot = &ping_prot, 111177d4b1d3SEric Dumazet .ops = &inet_sockraw_ops, 1112c319b4d7SVasiliy Kulikov .flags = INET_PROTOSW_REUSE, 1113c319b4d7SVasiliy Kulikov }, 11141da177e4SLinus Torvalds 11151da177e4SLinus Torvalds { 11161da177e4SLinus Torvalds .type = SOCK_RAW, 11171da177e4SLinus Torvalds .protocol = IPPROTO_IP, /* wild card */ 11181da177e4SLinus Torvalds .prot = &raw_prot, 11191da177e4SLinus Torvalds .ops = &inet_sockraw_ops, 11201da177e4SLinus Torvalds .flags = INET_PROTOSW_REUSE, 11211da177e4SLinus Torvalds } 11221da177e4SLinus Torvalds }; 11231da177e4SLinus Torvalds 1124c40f6fffSDenis Cheng #define INETSW_ARRAY_LEN ARRAY_SIZE(inetsw_array) 11251da177e4SLinus Torvalds 11261da177e4SLinus Torvalds void inet_register_protosw(struct inet_protosw *p) 11271da177e4SLinus Torvalds { 11281da177e4SLinus Torvalds struct list_head *lh; 11291da177e4SLinus Torvalds struct inet_protosw *answer; 11301da177e4SLinus Torvalds int protocol = p->protocol; 11311da177e4SLinus Torvalds struct list_head *last_perm; 11321da177e4SLinus Torvalds 11331da177e4SLinus Torvalds spin_lock_bh(&inetsw_lock); 11341da177e4SLinus Torvalds 11351da177e4SLinus Torvalds if (p->type >= SOCK_MAX) 11361da177e4SLinus Torvalds goto out_illegal; 11371da177e4SLinus Torvalds 11381da177e4SLinus Torvalds /* If we are trying to override a permanent protocol, bail. */ 11391da177e4SLinus Torvalds last_perm = &inetsw[p->type]; 11401da177e4SLinus Torvalds list_for_each(lh, &inetsw[p->type]) { 11411da177e4SLinus Torvalds answer = list_entry(lh, struct inet_protosw, list); 11421da177e4SLinus Torvalds /* Check only the non-wild match. */ 1143f6c53334SJunwei Zhang if ((INET_PROTOSW_PERMANENT & answer->flags) == 0) 11441da177e4SLinus Torvalds break; 1145f6c53334SJunwei Zhang if (protocol == answer->protocol) 1146f6c53334SJunwei Zhang goto out_permanent; 11471da177e4SLinus Torvalds last_perm = lh; 11481da177e4SLinus Torvalds } 11491da177e4SLinus Torvalds 11501da177e4SLinus Torvalds /* Add the new entry after the last permanent entry if any, so that 11511da177e4SLinus Torvalds * the new entry does not override a permanent entry when matched with 11521da177e4SLinus Torvalds * a wild-card protocol. But it is allowed to override any existing 11531da177e4SLinus Torvalds * non-permanent entry. This means that when we remove this entry, the 11541da177e4SLinus Torvalds * system automatically returns to the old behavior. 11551da177e4SLinus Torvalds */ 11561da177e4SLinus Torvalds list_add_rcu(&p->list, last_perm); 11571da177e4SLinus Torvalds out: 11581da177e4SLinus Torvalds spin_unlock_bh(&inetsw_lock); 11591da177e4SLinus Torvalds 11601da177e4SLinus Torvalds return; 11611da177e4SLinus Torvalds 11621da177e4SLinus Torvalds out_permanent: 1163058bd4d2SJoe Perches pr_err("Attempt to override permanent protocol %d\n", protocol); 11641da177e4SLinus Torvalds goto out; 11651da177e4SLinus Torvalds 11661da177e4SLinus Torvalds out_illegal: 1167058bd4d2SJoe Perches pr_err("Ignoring attempt to register invalid socket type %d\n", 11681da177e4SLinus Torvalds p->type); 11691da177e4SLinus Torvalds goto out; 11701da177e4SLinus Torvalds } 11713d1427f8SEric Dumazet EXPORT_SYMBOL(inet_register_protosw); 11721da177e4SLinus Torvalds 11731da177e4SLinus Torvalds void inet_unregister_protosw(struct inet_protosw *p) 11741da177e4SLinus Torvalds { 11751da177e4SLinus Torvalds if (INET_PROTOSW_PERMANENT & p->flags) { 1176058bd4d2SJoe Perches pr_err("Attempt to unregister permanent protocol %d\n", 11771da177e4SLinus Torvalds p->protocol); 11781da177e4SLinus Torvalds } else { 11791da177e4SLinus Torvalds spin_lock_bh(&inetsw_lock); 11801da177e4SLinus Torvalds list_del_rcu(&p->list); 11811da177e4SLinus Torvalds spin_unlock_bh(&inetsw_lock); 11821da177e4SLinus Torvalds 11831da177e4SLinus Torvalds synchronize_net(); 11841da177e4SLinus Torvalds } 11851da177e4SLinus Torvalds } 11863d1427f8SEric Dumazet EXPORT_SYMBOL(inet_unregister_protosw); 11871da177e4SLinus Torvalds 118832519f11SArnaldo Carvalho de Melo static int inet_sk_reselect_saddr(struct sock *sk) 118932519f11SArnaldo Carvalho de Melo { 119032519f11SArnaldo Carvalho de Melo struct inet_sock *inet = inet_sk(sk); 1191c720c7e8SEric Dumazet __be32 old_saddr = inet->inet_saddr; 1192c720c7e8SEric Dumazet __be32 daddr = inet->inet_daddr; 11936e869138SDavid S. Miller struct flowi4 *fl4; 1194b23dd4feSDavid S. Miller struct rtable *rt; 1195b23dd4feSDavid S. Miller __be32 new_saddr; 1196f6d8bd05SEric Dumazet struct ip_options_rcu *inet_opt; 119732519f11SArnaldo Carvalho de Melo 1198f6d8bd05SEric Dumazet inet_opt = rcu_dereference_protected(inet->inet_opt, 11991e1d04e6SHannes Frederic Sowa lockdep_sock_is_held(sk)); 1200f6d8bd05SEric Dumazet if (inet_opt && inet_opt->opt.srr) 1201f6d8bd05SEric Dumazet daddr = inet_opt->opt.faddr; 120232519f11SArnaldo Carvalho de Melo 120332519f11SArnaldo Carvalho de Melo /* Query new route. */ 12046e869138SDavid S. Miller fl4 = &inet->cork.fl.u.ip4; 12056e869138SDavid S. Miller rt = ip_route_connect(fl4, daddr, 0, RT_CONN_FLAGS(sk), 1206b23dd4feSDavid S. Miller sk->sk_bound_dev_if, sk->sk_protocol, 12070e0d44abSSteffen Klassert inet->inet_sport, inet->inet_dport, sk); 1208b23dd4feSDavid S. Miller if (IS_ERR(rt)) 1209b23dd4feSDavid S. Miller return PTR_ERR(rt); 121032519f11SArnaldo Carvalho de Melo 1211d8d1f30bSChangli Gao sk_setup_caps(sk, &rt->dst); 121232519f11SArnaldo Carvalho de Melo 12136e869138SDavid S. Miller new_saddr = fl4->saddr; 121432519f11SArnaldo Carvalho de Melo 121532519f11SArnaldo Carvalho de Melo if (new_saddr == old_saddr) 121632519f11SArnaldo Carvalho de Melo return 0; 121732519f11SArnaldo Carvalho de Melo 1218287b7f38SNikolay Borisov if (sock_net(sk)->ipv4.sysctl_ip_dynaddr > 1) { 1219058bd4d2SJoe Perches pr_info("%s(): shifting inet->saddr from %pI4 to %pI4\n", 1220673d57e7SHarvey Harrison __func__, &old_saddr, &new_saddr); 122132519f11SArnaldo Carvalho de Melo } 122232519f11SArnaldo Carvalho de Melo 1223c720c7e8SEric Dumazet inet->inet_saddr = inet->inet_rcv_saddr = new_saddr; 122432519f11SArnaldo Carvalho de Melo 122532519f11SArnaldo Carvalho de Melo /* 122632519f11SArnaldo Carvalho de Melo * XXX The only one ugly spot where we need to 122732519f11SArnaldo Carvalho de Melo * XXX really change the sockets identity after 122832519f11SArnaldo Carvalho de Melo * XXX it has entered the hashes. -DaveM 122932519f11SArnaldo Carvalho de Melo * 123032519f11SArnaldo Carvalho de Melo * Besides that, it does not check for connection 123132519f11SArnaldo Carvalho de Melo * uniqueness. Wait for troubles. 123232519f11SArnaldo Carvalho de Melo */ 1233086c653fSCraig Gallek return __sk_prot_rehash(sk); 123432519f11SArnaldo Carvalho de Melo } 123532519f11SArnaldo Carvalho de Melo 123632519f11SArnaldo Carvalho de Melo int inet_sk_rebuild_header(struct sock *sk) 123732519f11SArnaldo Carvalho de Melo { 123832519f11SArnaldo Carvalho de Melo struct inet_sock *inet = inet_sk(sk); 123932519f11SArnaldo Carvalho de Melo struct rtable *rt = (struct rtable *)__sk_dst_check(sk, 0); 12403ca3c68eSAl Viro __be32 daddr; 1241f6d8bd05SEric Dumazet struct ip_options_rcu *inet_opt; 12426e869138SDavid S. Miller struct flowi4 *fl4; 124332519f11SArnaldo Carvalho de Melo int err; 124432519f11SArnaldo Carvalho de Melo 124532519f11SArnaldo Carvalho de Melo /* Route is OK, nothing to do. */ 124632519f11SArnaldo Carvalho de Melo if (rt) 124732519f11SArnaldo Carvalho de Melo return 0; 124832519f11SArnaldo Carvalho de Melo 124932519f11SArnaldo Carvalho de Melo /* Reroute. */ 1250f6d8bd05SEric Dumazet rcu_read_lock(); 1251f6d8bd05SEric Dumazet inet_opt = rcu_dereference(inet->inet_opt); 1252c720c7e8SEric Dumazet daddr = inet->inet_daddr; 1253f6d8bd05SEric Dumazet if (inet_opt && inet_opt->opt.srr) 1254f6d8bd05SEric Dumazet daddr = inet_opt->opt.faddr; 1255f6d8bd05SEric Dumazet rcu_read_unlock(); 12566e869138SDavid S. Miller fl4 = &inet->cork.fl.u.ip4; 12576e869138SDavid S. Miller rt = ip_route_output_ports(sock_net(sk), fl4, sk, daddr, inet->inet_saddr, 125878fbfd8aSDavid S. Miller inet->inet_dport, inet->inet_sport, 125978fbfd8aSDavid S. Miller sk->sk_protocol, RT_CONN_FLAGS(sk), 126078fbfd8aSDavid S. Miller sk->sk_bound_dev_if); 1261b23dd4feSDavid S. Miller if (!IS_ERR(rt)) { 1262b23dd4feSDavid S. Miller err = 0; 1263d8d1f30bSChangli Gao sk_setup_caps(sk, &rt->dst); 1264b23dd4feSDavid S. Miller } else { 1265b23dd4feSDavid S. Miller err = PTR_ERR(rt); 1266b23dd4feSDavid S. Miller 126732519f11SArnaldo Carvalho de Melo /* Routing failed... */ 126832519f11SArnaldo Carvalho de Melo sk->sk_route_caps = 0; 126932519f11SArnaldo Carvalho de Melo /* 127032519f11SArnaldo Carvalho de Melo * Other protocols have to map its equivalent state to TCP_SYN_SENT. 127132519f11SArnaldo Carvalho de Melo * DCCP maps its DCCP_REQUESTING state to TCP_SYN_SENT. -acme 127232519f11SArnaldo Carvalho de Melo */ 1273287b7f38SNikolay Borisov if (!sock_net(sk)->ipv4.sysctl_ip_dynaddr || 127432519f11SArnaldo Carvalho de Melo sk->sk_state != TCP_SYN_SENT || 127532519f11SArnaldo Carvalho de Melo (sk->sk_userlocks & SOCK_BINDADDR_LOCK) || 127632519f11SArnaldo Carvalho de Melo (err = inet_sk_reselect_saddr(sk)) != 0) 127732519f11SArnaldo Carvalho de Melo sk->sk_err_soft = -err; 127832519f11SArnaldo Carvalho de Melo } 127932519f11SArnaldo Carvalho de Melo 128032519f11SArnaldo Carvalho de Melo return err; 128132519f11SArnaldo Carvalho de Melo } 128232519f11SArnaldo Carvalho de Melo EXPORT_SYMBOL(inet_sk_rebuild_header); 128332519f11SArnaldo Carvalho de Melo 1284563e0bb0SYafang Shao void inet_sk_set_state(struct sock *sk, int state) 1285563e0bb0SYafang Shao { 1286563e0bb0SYafang Shao trace_inet_sock_set_state(sk, sk->sk_state, state); 1287563e0bb0SYafang Shao sk->sk_state = state; 1288563e0bb0SYafang Shao } 1289563e0bb0SYafang Shao EXPORT_SYMBOL(inet_sk_set_state); 1290563e0bb0SYafang Shao 1291563e0bb0SYafang Shao void inet_sk_state_store(struct sock *sk, int newstate) 1292563e0bb0SYafang Shao { 1293563e0bb0SYafang Shao trace_inet_sock_set_state(sk, sk->sk_state, newstate); 1294563e0bb0SYafang Shao smp_store_release(&sk->sk_state, newstate); 1295563e0bb0SYafang Shao } 1296563e0bb0SYafang Shao 1297b8921ca8STom Herbert struct sk_buff *inet_gso_segment(struct sk_buff *skb, 1298c8f44affSMichał Mirosław netdev_features_t features) 1299f4c50d99SHerbert Xu { 13000c19f846SWillem de Bruijn bool udpfrag = false, fixedid = false, gso_partial, encap; 1301f4c50d99SHerbert Xu struct sk_buff *segs = ERR_PTR(-EINVAL); 1302bca49f84SVlad Yasevich const struct net_offload *ops; 13030c19f846SWillem de Bruijn unsigned int offset = 0; 1304f9242b6bSDavid S. Miller struct iphdr *iph; 1305802ab55aSAlexander Duyck int proto, tot_len; 13063347c960SEric Dumazet int nhoff; 1307f4c50d99SHerbert Xu int ihl; 1308f4c50d99SHerbert Xu int id; 1309f4c50d99SHerbert Xu 13103347c960SEric Dumazet skb_reset_network_header(skb); 13113347c960SEric Dumazet nhoff = skb_network_header(skb) - skb_mac_header(skb); 1312bbcf467dSHerbert Xu if (unlikely(!pskb_may_pull(skb, sizeof(*iph)))) 1313f4c50d99SHerbert Xu goto out; 1314f4c50d99SHerbert Xu 1315eddc9ec5SArnaldo Carvalho de Melo iph = ip_hdr(skb); 1316f4c50d99SHerbert Xu ihl = iph->ihl * 4; 1317f4c50d99SHerbert Xu if (ihl < sizeof(*iph)) 1318f4c50d99SHerbert Xu goto out; 1319f4c50d99SHerbert Xu 132047d27aadSEric Dumazet id = ntohs(iph->id); 132147d27aadSEric Dumazet proto = iph->protocol; 132247d27aadSEric Dumazet 132347d27aadSEric Dumazet /* Warning: after this point, iph might be no longer valid */ 1324bbcf467dSHerbert Xu if (unlikely(!pskb_may_pull(skb, ihl))) 1325f4c50d99SHerbert Xu goto out; 132647d27aadSEric Dumazet __skb_pull(skb, ihl); 1327f4c50d99SHerbert Xu 13288c3a897bSEric Dumazet encap = SKB_GSO_CB(skb)->encap_level > 0; 13298c3a897bSEric Dumazet if (encap) 13301e16aa3dSFlorian Westphal features &= skb->dev->hw_enc_features; 13313347c960SEric Dumazet SKB_GSO_CB(skb)->encap_level += ihl; 133273136267SPravin B Shelar 1333badff6d0SArnaldo Carvalho de Melo skb_reset_transport_header(skb); 133447d27aadSEric Dumazet 1335f4c50d99SHerbert Xu segs = ERR_PTR(-EPROTONOSUPPORT); 1336f4c50d99SHerbert Xu 1337cbc53e08SAlexander Duyck if (!skb->encapsulation || encap) { 13380c19f846SWillem de Bruijn udpfrag = !!(skb_shinfo(skb)->gso_type & SKB_GSO_UDP); 1339cbc53e08SAlexander Duyck fixedid = !!(skb_shinfo(skb)->gso_type & SKB_GSO_TCP_FIXEDID); 1340cbc53e08SAlexander Duyck 1341cbc53e08SAlexander Duyck /* fixed ID is invalid if DF bit is not set */ 1342a5108878SArnaldo Carvalho de Melo if (fixedid && !(ip_hdr(skb)->frag_off & htons(IP_DF))) 1343cbc53e08SAlexander Duyck goto out; 1344cbc53e08SAlexander Duyck } 1345dcd60771SEric Dumazet 1346bca49f84SVlad Yasevich ops = rcu_dereference(inet_offloads[proto]); 1347f191a1d1SVlad Yasevich if (likely(ops && ops->callbacks.gso_segment)) 1348f191a1d1SVlad Yasevich segs = ops->callbacks.gso_segment(skb, features); 1349f4c50d99SHerbert Xu 135050c3a487SYOSHIFUJI Hideaki / 吉藤英明 if (IS_ERR_OR_NULL(segs)) 1351f4c50d99SHerbert Xu goto out; 1352f4c50d99SHerbert Xu 135307b26c94SSteffen Klassert gso_partial = !!(skb_shinfo(segs)->gso_type & SKB_GSO_PARTIAL); 135407b26c94SSteffen Klassert 1355f4c50d99SHerbert Xu skb = segs; 1356f4c50d99SHerbert Xu do { 13573347c960SEric Dumazet iph = (struct iphdr *)(skb_mac_header(skb) + nhoff); 13580c19f846SWillem de Bruijn if (udpfrag) { 13590c19f846SWillem de Bruijn iph->frag_off = htons(offset >> 3); 13600c19f846SWillem de Bruijn if (skb->next) 13610c19f846SWillem de Bruijn iph->frag_off |= htons(IP_MF); 13620c19f846SWillem de Bruijn offset += skb->len - nhoff - ihl; 13630c19f846SWillem de Bruijn tot_len = skb->len - nhoff; 13640c19f846SWillem de Bruijn } else if (skb_is_gso(skb)) { 1365802ab55aSAlexander Duyck if (!fixedid) { 1366802ab55aSAlexander Duyck iph->id = htons(id); 1367802ab55aSAlexander Duyck id += skb_shinfo(skb)->gso_segs; 1368490ab081SPravin B Shelar } 136907b26c94SSteffen Klassert 137007b26c94SSteffen Klassert if (gso_partial) 1371802ab55aSAlexander Duyck tot_len = skb_shinfo(skb)->gso_size + 1372802ab55aSAlexander Duyck SKB_GSO_CB(skb)->data_offset + 1373802ab55aSAlexander Duyck skb->head - (unsigned char *)iph; 137407b26c94SSteffen Klassert else 137507b26c94SSteffen Klassert tot_len = skb->len - nhoff; 1376802ab55aSAlexander Duyck } else { 1377802ab55aSAlexander Duyck if (!fixedid) 1378802ab55aSAlexander Duyck iph->id = htons(id++); 1379802ab55aSAlexander Duyck tot_len = skb->len - nhoff; 1380802ab55aSAlexander Duyck } 1381802ab55aSAlexander Duyck iph->tot_len = htons(tot_len); 138247d27aadSEric Dumazet ip_send_check(iph); 13838c3a897bSEric Dumazet if (encap) 13843347c960SEric Dumazet skb_reset_inner_headers(skb); 13853347c960SEric Dumazet skb->network_header = (u8 *)iph - skb->head; 1386c56cae23SToke Høiland-Jørgensen skb_reset_mac_len(skb); 1387f4c50d99SHerbert Xu } while ((skb = skb->next)); 1388f4c50d99SHerbert Xu 1389f4c50d99SHerbert Xu out: 1390f4c50d99SHerbert Xu return segs; 1391f4c50d99SHerbert Xu } 1392b8921ca8STom Herbert EXPORT_SYMBOL(inet_gso_segment); 1393f4c50d99SHerbert Xu 1394418e897eSWillem de Bruijn static struct sk_buff *ipip_gso_segment(struct sk_buff *skb, 1395418e897eSWillem de Bruijn netdev_features_t features) 1396418e897eSWillem de Bruijn { 1397418e897eSWillem de Bruijn if (!(skb_shinfo(skb)->gso_type & SKB_GSO_IPXIP4)) 1398418e897eSWillem de Bruijn return ERR_PTR(-EINVAL); 1399418e897eSWillem de Bruijn 1400418e897eSWillem de Bruijn return inet_gso_segment(skb, features); 1401418e897eSWillem de Bruijn } 1402418e897eSWillem de Bruijn 1403028e0a47SPaolo Abeni INDIRECT_CALLABLE_DECLARE(struct sk_buff *tcp4_gro_receive(struct list_head *, 1404028e0a47SPaolo Abeni struct sk_buff *)); 1405028e0a47SPaolo Abeni INDIRECT_CALLABLE_DECLARE(struct sk_buff *udp4_gro_receive(struct list_head *, 1406028e0a47SPaolo Abeni struct sk_buff *)); 1407d4546c25SDavid Miller struct sk_buff *inet_gro_receive(struct list_head *head, struct sk_buff *skb) 140873cc19f1SHerbert Xu { 1409bca49f84SVlad Yasevich const struct net_offload *ops; 1410d4546c25SDavid Miller struct sk_buff *pp = NULL; 1411b71d1d42SEric Dumazet const struct iphdr *iph; 1412d4546c25SDavid Miller struct sk_buff *p; 1413a5b1cf28SHerbert Xu unsigned int hlen; 1414a5b1cf28SHerbert Xu unsigned int off; 14151075f3f6SHerbert Xu unsigned int id; 141673cc19f1SHerbert Xu int flush = 1; 141773cc19f1SHerbert Xu int proto; 141873cc19f1SHerbert Xu 1419a5b1cf28SHerbert Xu off = skb_gro_offset(skb); 1420a5b1cf28SHerbert Xu hlen = off + sizeof(*iph); 1421a5b1cf28SHerbert Xu iph = skb_gro_header_fast(skb, off); 1422a5b1cf28SHerbert Xu if (skb_gro_header_hard(skb, hlen)) { 1423a5b1cf28SHerbert Xu iph = skb_gro_header_slow(skb, hlen, off); 142486911732SHerbert Xu if (unlikely(!iph)) 142573cc19f1SHerbert Xu goto out; 1426a5b1cf28SHerbert Xu } 142773cc19f1SHerbert Xu 1428f9242b6bSDavid S. Miller proto = iph->protocol; 142973cc19f1SHerbert Xu 143073cc19f1SHerbert Xu rcu_read_lock(); 1431bca49f84SVlad Yasevich ops = rcu_dereference(inet_offloads[proto]); 1432f191a1d1SVlad Yasevich if (!ops || !ops->callbacks.gro_receive) 143373cc19f1SHerbert Xu goto out_unlock; 143473cc19f1SHerbert Xu 1435a5ad24beSHerbert Xu if (*(u8 *)iph != 0x45) 143673cc19f1SHerbert Xu goto out_unlock; 143773cc19f1SHerbert Xu 14389b83e031SSteffen Klassert if (ip_is_fragment(iph)) 14399b83e031SSteffen Klassert goto out_unlock; 14409b83e031SSteffen Klassert 1441a9e050f4SEric Dumazet if (unlikely(ip_fast_csum((u8 *)iph, 5))) 144273cc19f1SHerbert Xu goto out_unlock; 144373cc19f1SHerbert Xu 14440eae88f3SEric Dumazet id = ntohl(*(__be32 *)&iph->id); 1445db8caf3dSEric Dumazet flush = (u16)((ntohl(*(__be32 *)iph) ^ skb_gro_len(skb)) | (id & ~IP_DF)); 14461075f3f6SHerbert Xu id >>= 16; 144773cc19f1SHerbert Xu 1448d4546c25SDavid Miller list_for_each_entry(p, head, list) { 144973cc19f1SHerbert Xu struct iphdr *iph2; 14501530545eSAlexander Duyck u16 flush_id; 145173cc19f1SHerbert Xu 145273cc19f1SHerbert Xu if (!NAPI_GRO_CB(p)->same_flow) 145373cc19f1SHerbert Xu continue; 145473cc19f1SHerbert Xu 1455299603e8SJerry Chu iph2 = (struct iphdr *)(p->data + off); 1456299603e8SJerry Chu /* The above works because, with the exception of the top 1457299603e8SJerry Chu * (inner most) layer, we only aggregate pkts with the same 1458299603e8SJerry Chu * hdr length so all the hdrs we'll need to verify will start 1459299603e8SJerry Chu * at the same offset. 1460299603e8SJerry Chu */ 1461a5ad24beSHerbert Xu if ((iph->protocol ^ iph2->protocol) | 14620eae88f3SEric Dumazet ((__force u32)iph->saddr ^ (__force u32)iph2->saddr) | 14630eae88f3SEric Dumazet ((__force u32)iph->daddr ^ (__force u32)iph2->daddr)) { 146473cc19f1SHerbert Xu NAPI_GRO_CB(p)->same_flow = 0; 146573cc19f1SHerbert Xu continue; 146673cc19f1SHerbert Xu } 146773cc19f1SHerbert Xu 146873cc19f1SHerbert Xu /* All fields must match except length and checksum. */ 146973cc19f1SHerbert Xu NAPI_GRO_CB(p)->flush |= 1470a5ad24beSHerbert Xu (iph->ttl ^ iph2->ttl) | 1471a9e050f4SEric Dumazet (iph->tos ^ iph2->tos) | 1472bf5a755fSJerry Chu ((iph->frag_off ^ iph2->frag_off) & htons(IP_DF)); 147373cc19f1SHerbert Xu 147473cc19f1SHerbert Xu NAPI_GRO_CB(p)->flush |= flush; 14751530545eSAlexander Duyck 14761530545eSAlexander Duyck /* We need to store of the IP ID check to be included later 14771530545eSAlexander Duyck * when we can verify that this packet does in fact belong 14781530545eSAlexander Duyck * to a given flow. 14791530545eSAlexander Duyck */ 14801530545eSAlexander Duyck flush_id = (u16)(id - ntohs(iph2->id)); 14811530545eSAlexander Duyck 14821530545eSAlexander Duyck /* This bit of code makes it much easier for us to identify 14831530545eSAlexander Duyck * the cases where we are doing atomic vs non-atomic IP ID 14841530545eSAlexander Duyck * checks. Specifically an atomic check can return IP ID 14851530545eSAlexander Duyck * values 0 - 0xFFFF, while a non-atomic check can only 14861530545eSAlexander Duyck * return 0 or 0xFFFF. 14871530545eSAlexander Duyck */ 14881530545eSAlexander Duyck if (!NAPI_GRO_CB(p)->is_atomic || 14891530545eSAlexander Duyck !(iph->frag_off & htons(IP_DF))) { 14901530545eSAlexander Duyck flush_id ^= NAPI_GRO_CB(p)->count; 14911530545eSAlexander Duyck flush_id = flush_id ? 0xFFFF : 0; 149273cc19f1SHerbert Xu } 149373cc19f1SHerbert Xu 14941530545eSAlexander Duyck /* If the previous IP ID value was based on an atomic 14951530545eSAlexander Duyck * datagram we can overwrite the value and ignore it. 14961530545eSAlexander Duyck */ 14971530545eSAlexander Duyck if (NAPI_GRO_CB(skb)->is_atomic) 14981530545eSAlexander Duyck NAPI_GRO_CB(p)->flush_id = flush_id; 14991530545eSAlexander Duyck else 15001530545eSAlexander Duyck NAPI_GRO_CB(p)->flush_id |= flush_id; 15011530545eSAlexander Duyck } 15021530545eSAlexander Duyck 15031530545eSAlexander Duyck NAPI_GRO_CB(skb)->is_atomic = !!(iph->frag_off & htons(IP_DF)); 150473cc19f1SHerbert Xu NAPI_GRO_CB(skb)->flush |= flush; 1505299603e8SJerry Chu skb_set_network_header(skb, off); 1506299603e8SJerry Chu /* The above will be needed by the transport layer if there is one 1507299603e8SJerry Chu * immediately following this IP hdr. 1508299603e8SJerry Chu */ 1509299603e8SJerry Chu 15102c804d0fSEric Dumazet /* Note : No need to call skb_gro_postpull_rcsum() here, 15112c804d0fSEric Dumazet * as we already checked checksum over ipv4 header was 0 15122c804d0fSEric Dumazet */ 151386911732SHerbert Xu skb_gro_pull(skb, sizeof(*iph)); 151486911732SHerbert Xu skb_set_transport_header(skb, skb_gro_offset(skb)); 151573cc19f1SHerbert Xu 1516028e0a47SPaolo Abeni pp = indirect_call_gro_receive(tcp4_gro_receive, udp4_gro_receive, 1517028e0a47SPaolo Abeni ops->callbacks.gro_receive, head, skb); 151873cc19f1SHerbert Xu 151973cc19f1SHerbert Xu out_unlock: 152073cc19f1SHerbert Xu rcu_read_unlock(); 152173cc19f1SHerbert Xu 152273cc19f1SHerbert Xu out: 15235f114163SSteffen Klassert skb_gro_flush_final(skb, pp, flush); 152473cc19f1SHerbert Xu 152573cc19f1SHerbert Xu return pp; 152673cc19f1SHerbert Xu } 1527b8921ca8STom Herbert EXPORT_SYMBOL(inet_gro_receive); 152873cc19f1SHerbert Xu 1529d4546c25SDavid Miller static struct sk_buff *ipip_gro_receive(struct list_head *head, 1530fac8e0f5SJesse Gross struct sk_buff *skb) 1531fac8e0f5SJesse Gross { 1532fac8e0f5SJesse Gross if (NAPI_GRO_CB(skb)->encap_mark) { 1533fac8e0f5SJesse Gross NAPI_GRO_CB(skb)->flush = 1; 1534fac8e0f5SJesse Gross return NULL; 1535fac8e0f5SJesse Gross } 1536fac8e0f5SJesse Gross 1537fac8e0f5SJesse Gross NAPI_GRO_CB(skb)->encap_mark = 1; 1538fac8e0f5SJesse Gross 1539fac8e0f5SJesse Gross return inet_gro_receive(head, skb); 1540fac8e0f5SJesse Gross } 1541fac8e0f5SJesse Gross 1542822c8685SDeepa Dinamani #define SECONDS_PER_DAY 86400 1543822c8685SDeepa Dinamani 1544822c8685SDeepa Dinamani /* inet_current_timestamp - Return IP network timestamp 1545822c8685SDeepa Dinamani * 1546822c8685SDeepa Dinamani * Return milliseconds since midnight in network byte order. 1547822c8685SDeepa Dinamani */ 1548822c8685SDeepa Dinamani __be32 inet_current_timestamp(void) 1549822c8685SDeepa Dinamani { 1550822c8685SDeepa Dinamani u32 secs; 1551822c8685SDeepa Dinamani u32 msecs; 1552822c8685SDeepa Dinamani struct timespec64 ts; 1553822c8685SDeepa Dinamani 1554822c8685SDeepa Dinamani ktime_get_real_ts64(&ts); 1555822c8685SDeepa Dinamani 1556822c8685SDeepa Dinamani /* Get secs since midnight. */ 1557822c8685SDeepa Dinamani (void)div_u64_rem(ts.tv_sec, SECONDS_PER_DAY, &secs); 1558822c8685SDeepa Dinamani /* Convert to msecs. */ 1559822c8685SDeepa Dinamani msecs = secs * MSEC_PER_SEC; 1560822c8685SDeepa Dinamani /* Convert nsec to msec. */ 1561822c8685SDeepa Dinamani msecs += (u32)ts.tv_nsec / NSEC_PER_MSEC; 1562822c8685SDeepa Dinamani 1563822c8685SDeepa Dinamani /* Convert to network byte order. */ 15643ba9d300SDeepa Dinamani return htonl(msecs); 1565822c8685SDeepa Dinamani } 1566822c8685SDeepa Dinamani EXPORT_SYMBOL(inet_current_timestamp); 1567822c8685SDeepa Dinamani 1568f4713a3dSWillem de Bruijn int inet_recv_error(struct sock *sk, struct msghdr *msg, int len, int *addr_len) 1569f4713a3dSWillem de Bruijn { 1570f4713a3dSWillem de Bruijn if (sk->sk_family == AF_INET) 1571f4713a3dSWillem de Bruijn return ip_recv_error(sk, msg, len, addr_len); 1572f4713a3dSWillem de Bruijn #if IS_ENABLED(CONFIG_IPV6) 1573f4713a3dSWillem de Bruijn if (sk->sk_family == AF_INET6) 1574f4713a3dSWillem de Bruijn return pingv6_ops.ipv6_recv_error(sk, msg, len, addr_len); 1575f4713a3dSWillem de Bruijn #endif 1576f4713a3dSWillem de Bruijn return -EINVAL; 1577f4713a3dSWillem de Bruijn } 1578f4713a3dSWillem de Bruijn 1579028e0a47SPaolo Abeni INDIRECT_CALLABLE_DECLARE(int tcp4_gro_complete(struct sk_buff *, int)); 1580028e0a47SPaolo Abeni INDIRECT_CALLABLE_DECLARE(int udp4_gro_complete(struct sk_buff *, int)); 1581b8921ca8STom Herbert int inet_gro_complete(struct sk_buff *skb, int nhoff) 158273cc19f1SHerbert Xu { 1583299603e8SJerry Chu __be16 newlen = htons(skb->len - nhoff); 1584299603e8SJerry Chu struct iphdr *iph = (struct iphdr *)(skb->data + nhoff); 1585bca49f84SVlad Yasevich const struct net_offload *ops; 1586f9242b6bSDavid S. Miller int proto = iph->protocol; 1587f9242b6bSDavid S. Miller int err = -ENOSYS; 158873cc19f1SHerbert Xu 1589294acf1cSPaolo Abeni if (skb->encapsulation) { 1590294acf1cSPaolo Abeni skb_set_inner_protocol(skb, cpu_to_be16(ETH_P_IP)); 1591c3caf119SJerry Chu skb_set_inner_network_header(skb, nhoff); 1592294acf1cSPaolo Abeni } 1593c3caf119SJerry Chu 159473cc19f1SHerbert Xu csum_replace2(&iph->check, iph->tot_len, newlen); 159573cc19f1SHerbert Xu iph->tot_len = newlen; 159673cc19f1SHerbert Xu 159773cc19f1SHerbert Xu rcu_read_lock(); 1598bca49f84SVlad Yasevich ops = rcu_dereference(inet_offloads[proto]); 1599f191a1d1SVlad Yasevich if (WARN_ON(!ops || !ops->callbacks.gro_complete)) 160073cc19f1SHerbert Xu goto out_unlock; 160173cc19f1SHerbert Xu 1602299603e8SJerry Chu /* Only need to add sizeof(*iph) to get to the next hdr below 1603299603e8SJerry Chu * because any hdr with option will have been flushed in 1604299603e8SJerry Chu * inet_gro_receive(). 1605299603e8SJerry Chu */ 1606028e0a47SPaolo Abeni err = INDIRECT_CALL_2(ops->callbacks.gro_complete, 1607028e0a47SPaolo Abeni tcp4_gro_complete, udp4_gro_complete, 1608028e0a47SPaolo Abeni skb, nhoff + sizeof(*iph)); 160973cc19f1SHerbert Xu 161073cc19f1SHerbert Xu out_unlock: 161173cc19f1SHerbert Xu rcu_read_unlock(); 161273cc19f1SHerbert Xu 161373cc19f1SHerbert Xu return err; 161473cc19f1SHerbert Xu } 1615b8921ca8STom Herbert EXPORT_SYMBOL(inet_gro_complete); 161673cc19f1SHerbert Xu 1617b8cba75bSJesse Gross static int ipip_gro_complete(struct sk_buff *skb, int nhoff) 1618b8cba75bSJesse Gross { 1619b8cba75bSJesse Gross skb->encapsulation = 1; 16207e13318dSTom Herbert skb_shinfo(skb)->gso_type |= SKB_GSO_IPXIP4; 1621b8cba75bSJesse Gross return inet_gro_complete(skb, nhoff); 1622b8cba75bSJesse Gross } 1623b8cba75bSJesse Gross 1624eee4fe4dSDenis V. Lunev int inet_ctl_sock_create(struct sock **sk, unsigned short family, 16255677242fSDenis V. Lunev unsigned short type, unsigned char protocol, 16265677242fSDenis V. Lunev struct net *net) 16273d58b5faSDenis V. Lunev { 1628eee4fe4dSDenis V. Lunev struct socket *sock; 162926abe143SEric W. Biederman int rc = sock_create_kern(net, family, type, protocol, &sock); 16303d58b5faSDenis V. Lunev 16313d58b5faSDenis V. Lunev if (rc == 0) { 1632eee4fe4dSDenis V. Lunev *sk = sock->sk; 1633eee4fe4dSDenis V. Lunev (*sk)->sk_allocation = GFP_ATOMIC; 16343d58b5faSDenis V. Lunev /* 16353d58b5faSDenis V. Lunev * Unhash it so that IP input processing does not even see it, 16363d58b5faSDenis V. Lunev * we do not wish this socket to see incoming packets. 16373d58b5faSDenis V. Lunev */ 1638eee4fe4dSDenis V. Lunev (*sk)->sk_prot->unhash(*sk); 16393d58b5faSDenis V. Lunev } 16403d58b5faSDenis V. Lunev return rc; 16413d58b5faSDenis V. Lunev } 16423d58b5faSDenis V. Lunev EXPORT_SYMBOL_GPL(inet_ctl_sock_create); 16433d58b5faSDenis V. Lunev 1644c4c6bc31SRaghavendra K T u64 snmp_get_cpu_field(void __percpu *mib, int cpu, int offt) 1645c4c6bc31SRaghavendra K T { 1646c4c6bc31SRaghavendra K T return *(((unsigned long *)per_cpu_ptr(mib, cpu)) + offt); 1647c4c6bc31SRaghavendra K T } 1648c4c6bc31SRaghavendra K T EXPORT_SYMBOL_GPL(snmp_get_cpu_field); 1649c4c6bc31SRaghavendra K T 1650698365faSWANG Cong unsigned long snmp_fold_field(void __percpu *mib, int offt) 16515e0f0435SHerbert Xu { 16525e0f0435SHerbert Xu unsigned long res = 0; 1653698365faSWANG Cong int i; 16545e0f0435SHerbert Xu 1655698365faSWANG Cong for_each_possible_cpu(i) 1656c4c6bc31SRaghavendra K T res += snmp_get_cpu_field(mib, i, offt); 16575e0f0435SHerbert Xu return res; 16585e0f0435SHerbert Xu } 16595e0f0435SHerbert Xu EXPORT_SYMBOL_GPL(snmp_fold_field); 16605e0f0435SHerbert Xu 16614ce3c183SEric Dumazet #if BITS_PER_LONG==32 16624ce3c183SEric Dumazet 166380ec1927SDavid S. Miller u64 snmp_get_cpu_field64(void __percpu *mib, int cpu, int offt, 1664c4c6bc31SRaghavendra K T size_t syncp_offset) 16654ce3c183SEric Dumazet { 16668f0ea0feSEric Dumazet void *bhptr; 16674ce3c183SEric Dumazet struct u64_stats_sync *syncp; 16688f0ea0feSEric Dumazet u64 v; 16694ce3c183SEric Dumazet unsigned int start; 16704ce3c183SEric Dumazet 1671698365faSWANG Cong bhptr = per_cpu_ptr(mib, cpu); 16724ce3c183SEric Dumazet syncp = (struct u64_stats_sync *)(bhptr + syncp_offset); 16734ce3c183SEric Dumazet do { 167457a7744eSEric W. Biederman start = u64_stats_fetch_begin_irq(syncp); 16758f0ea0feSEric Dumazet v = *(((u64 *)bhptr) + offt); 167657a7744eSEric W. Biederman } while (u64_stats_fetch_retry_irq(syncp, start)); 16774ce3c183SEric Dumazet 1678c4c6bc31SRaghavendra K T return v; 1679c4c6bc31SRaghavendra K T } 1680c4c6bc31SRaghavendra K T EXPORT_SYMBOL_GPL(snmp_get_cpu_field64); 1681c4c6bc31SRaghavendra K T 1682c4c6bc31SRaghavendra K T u64 snmp_fold_field64(void __percpu *mib, int offt, size_t syncp_offset) 1683c4c6bc31SRaghavendra K T { 1684c4c6bc31SRaghavendra K T u64 res = 0; 1685c4c6bc31SRaghavendra K T int cpu; 1686c4c6bc31SRaghavendra K T 1687c4c6bc31SRaghavendra K T for_each_possible_cpu(cpu) { 1688d1bfc625SMadalin Bucur res += snmp_get_cpu_field64(mib, cpu, offt, syncp_offset); 16894ce3c183SEric Dumazet } 16904ce3c183SEric Dumazet return res; 16914ce3c183SEric Dumazet } 16924ce3c183SEric Dumazet EXPORT_SYMBOL_GPL(snmp_fold_field64); 16934ce3c183SEric Dumazet #endif 16944ce3c183SEric Dumazet 16951da177e4SLinus Torvalds #ifdef CONFIG_IP_MULTICAST 169632613090SAlexey Dobriyan static const struct net_protocol igmp_protocol = { 16971da177e4SLinus Torvalds .handler = igmp_rcv, 1698b4ee07dfSAlexey Dobriyan .netns_ok = 1, 16991da177e4SLinus Torvalds }; 17001da177e4SLinus Torvalds #endif 17011da177e4SLinus Torvalds 1702a8e3bb34SDavid Ahern /* thinking of making this const? Don't. 1703a8e3bb34SDavid Ahern * early_demux can change based on sysctl. 1704a8e3bb34SDavid Ahern */ 170503157937SDavid Ahern static struct net_protocol tcp_protocol = { 170641063e9dSDavid S. Miller .early_demux = tcp_v4_early_demux, 1707dddb64bcSsubashab@codeaurora.org .early_demux_handler = tcp_v4_early_demux, 17081da177e4SLinus Torvalds .handler = tcp_v4_rcv, 17091da177e4SLinus Torvalds .err_handler = tcp_v4_err, 17101da177e4SLinus Torvalds .no_policy = 1, 171192f1fecbSDenis V. Lunev .netns_ok = 1, 17128ed1dc44SHannes Frederic Sowa .icmp_strict_tag_validation = 1, 17131da177e4SLinus Torvalds }; 17141da177e4SLinus Torvalds 1715a8e3bb34SDavid Ahern /* thinking of making this const? Don't. 1716a8e3bb34SDavid Ahern * early_demux can change based on sysctl. 1717a8e3bb34SDavid Ahern */ 171803157937SDavid Ahern static struct net_protocol udp_protocol = { 1719421b3885SShawn Bohrer .early_demux = udp_v4_early_demux, 1720dddb64bcSsubashab@codeaurora.org .early_demux_handler = udp_v4_early_demux, 17211da177e4SLinus Torvalds .handler = udp_rcv, 17221da177e4SLinus Torvalds .err_handler = udp_err, 17231da177e4SLinus Torvalds .no_policy = 1, 172492f1fecbSDenis V. Lunev .netns_ok = 1, 17251da177e4SLinus Torvalds }; 17261da177e4SLinus Torvalds 172732613090SAlexey Dobriyan static const struct net_protocol icmp_protocol = { 17281da177e4SLinus Torvalds .handler = icmp_rcv, 17295b052042SLi Wei .err_handler = icmp_err, 17308b7817f3SHerbert Xu .no_policy = 1, 173192f1fecbSDenis V. Lunev .netns_ok = 1, 17321da177e4SLinus Torvalds }; 17331da177e4SLinus Torvalds 17349b4661bdSPavel Emelyanov static __net_init int ipv4_mib_init_net(struct net *net) 17359b4661bdSPavel Emelyanov { 1736827da44cSJohn Stultz int i; 1737827da44cSJohn Stultz 1738698365faSWANG Cong net->mib.tcp_statistics = alloc_percpu(struct tcp_mib); 1739698365faSWANG Cong if (!net->mib.tcp_statistics) 174057ef42d5SPavel Emelyanov goto err_tcp_mib; 1741698365faSWANG Cong net->mib.ip_statistics = alloc_percpu(struct ipstats_mib); 1742698365faSWANG Cong if (!net->mib.ip_statistics) 1743a20f5799SPavel Emelyanov goto err_ip_mib; 1744827da44cSJohn Stultz 1745827da44cSJohn Stultz for_each_possible_cpu(i) { 1746827da44cSJohn Stultz struct ipstats_mib *af_inet_stats; 1747698365faSWANG Cong af_inet_stats = per_cpu_ptr(net->mib.ip_statistics, i); 1748827da44cSJohn Stultz u64_stats_init(&af_inet_stats->syncp); 1749827da44cSJohn Stultz } 1750827da44cSJohn Stultz 1751698365faSWANG Cong net->mib.net_statistics = alloc_percpu(struct linux_mib); 1752698365faSWANG Cong if (!net->mib.net_statistics) 175361a7e260SPavel Emelyanov goto err_net_mib; 1754698365faSWANG Cong net->mib.udp_statistics = alloc_percpu(struct udp_mib); 1755698365faSWANG Cong if (!net->mib.udp_statistics) 17562f275f91SPavel Emelyanov goto err_udp_mib; 1757698365faSWANG Cong net->mib.udplite_statistics = alloc_percpu(struct udp_mib); 1758698365faSWANG Cong if (!net->mib.udplite_statistics) 1759386019d3SPavel Emelyanov goto err_udplite_mib; 1760698365faSWANG Cong net->mib.icmp_statistics = alloc_percpu(struct icmp_mib); 1761698365faSWANG Cong if (!net->mib.icmp_statistics) 1762b60538a0SPavel Emelyanov goto err_icmp_mib; 1763acb32ba3SEric Dumazet net->mib.icmpmsg_statistics = kzalloc(sizeof(struct icmpmsg_mib), 1764acb32ba3SEric Dumazet GFP_KERNEL); 1765acb32ba3SEric Dumazet if (!net->mib.icmpmsg_statistics) 1766923c6586SPavel Emelyanov goto err_icmpmsg_mib; 176757ef42d5SPavel Emelyanov 176857ef42d5SPavel Emelyanov tcp_mib_init(net); 17699b4661bdSPavel Emelyanov return 0; 177057ef42d5SPavel Emelyanov 1771923c6586SPavel Emelyanov err_icmpmsg_mib: 1772698365faSWANG Cong free_percpu(net->mib.icmp_statistics); 1773b60538a0SPavel Emelyanov err_icmp_mib: 1774698365faSWANG Cong free_percpu(net->mib.udplite_statistics); 1775386019d3SPavel Emelyanov err_udplite_mib: 1776698365faSWANG Cong free_percpu(net->mib.udp_statistics); 17772f275f91SPavel Emelyanov err_udp_mib: 1778698365faSWANG Cong free_percpu(net->mib.net_statistics); 177961a7e260SPavel Emelyanov err_net_mib: 1780698365faSWANG Cong free_percpu(net->mib.ip_statistics); 1781a20f5799SPavel Emelyanov err_ip_mib: 1782698365faSWANG Cong free_percpu(net->mib.tcp_statistics); 178357ef42d5SPavel Emelyanov err_tcp_mib: 178457ef42d5SPavel Emelyanov return -ENOMEM; 17859b4661bdSPavel Emelyanov } 17869b4661bdSPavel Emelyanov 17879b4661bdSPavel Emelyanov static __net_exit void ipv4_mib_exit_net(struct net *net) 17889b4661bdSPavel Emelyanov { 1789acb32ba3SEric Dumazet kfree(net->mib.icmpmsg_statistics); 1790698365faSWANG Cong free_percpu(net->mib.icmp_statistics); 1791698365faSWANG Cong free_percpu(net->mib.udplite_statistics); 1792698365faSWANG Cong free_percpu(net->mib.udp_statistics); 1793698365faSWANG Cong free_percpu(net->mib.net_statistics); 1794698365faSWANG Cong free_percpu(net->mib.ip_statistics); 1795698365faSWANG Cong free_percpu(net->mib.tcp_statistics); 1796fc518953SFlorian Westphal #ifdef CONFIG_MPTCP 1797fc518953SFlorian Westphal /* allocated on demand, see mptcp_init_sock() */ 1798fc518953SFlorian Westphal free_percpu(net->mib.mptcp_statistics); 1799fc518953SFlorian Westphal #endif 18009b4661bdSPavel Emelyanov } 18019b4661bdSPavel Emelyanov 18029b4661bdSPavel Emelyanov static __net_initdata struct pernet_operations ipv4_mib_ops = { 18039b4661bdSPavel Emelyanov .init = ipv4_mib_init_net, 18049b4661bdSPavel Emelyanov .exit = ipv4_mib_exit_net, 18059b4661bdSPavel Emelyanov }; 18069b4661bdSPavel Emelyanov 18071da177e4SLinus Torvalds static int __init init_ipv4_mibs(void) 18081da177e4SLinus Torvalds { 1809d89cbbb1SPavel Emelyanov return register_pernet_subsys(&ipv4_mib_ops); 18101da177e4SLinus Torvalds } 18111da177e4SLinus Torvalds 1812c9d8f1a6SCong Wang static __net_init int inet_init_net(struct net *net) 1813c9d8f1a6SCong Wang { 1814c9d8f1a6SCong Wang /* 1815c9d8f1a6SCong Wang * Set defaults for local port range 1816c9d8f1a6SCong Wang */ 1817c9d8f1a6SCong Wang seqlock_init(&net->ipv4.ip_local_ports.lock); 1818c9d8f1a6SCong Wang net->ipv4.ip_local_ports.range[0] = 32768; 181907f4c900SEric Dumazet net->ipv4.ip_local_ports.range[1] = 60999; 1820ba6b918aSCong Wang 1821ba6b918aSCong Wang seqlock_init(&net->ipv4.ping_group_range.lock); 1822ba6b918aSCong Wang /* 1823ba6b918aSCong Wang * Sane defaults - nobody may create ping sockets. 1824ba6b918aSCong Wang * Boot scripts should set this to distro-specific group. 1825ba6b918aSCong Wang */ 1826ba6b918aSCong Wang net->ipv4.ping_group_range.range[0] = make_kgid(&init_user_ns, 1); 1827ba6b918aSCong Wang net->ipv4.ping_group_range.range[1] = make_kgid(&init_user_ns, 0); 1828049bbf58SEzequiel Garcia 1829049bbf58SEzequiel Garcia /* Default values for sysctl-controlled parameters. 1830049bbf58SEzequiel Garcia * We set them here, in case sysctl is not compiled. 1831049bbf58SEzequiel Garcia */ 1832049bbf58SEzequiel Garcia net->ipv4.sysctl_ip_default_ttl = IPDEFTTL; 1833432e05d3SPetr Machata net->ipv4.sysctl_ip_fwd_update_priority = 1; 1834049bbf58SEzequiel Garcia net->ipv4.sysctl_ip_dynaddr = 0; 1835049bbf58SEzequiel Garcia net->ipv4.sysctl_ip_early_demux = 1; 1836dddb64bcSsubashab@codeaurora.org net->ipv4.sysctl_udp_early_demux = 1; 1837dddb64bcSsubashab@codeaurora.org net->ipv4.sysctl_tcp_early_demux = 1; 18384548b683SKrister Johansen #ifdef CONFIG_SYSCTL 18394548b683SKrister Johansen net->ipv4.sysctl_ip_prot_sock = PROT_SOCK; 18404548b683SKrister Johansen #endif 1841049bbf58SEzequiel Garcia 18421714020eSNikolay Borisov /* Some igmp sysctl, whose values are always used */ 18431714020eSNikolay Borisov net->ipv4.sysctl_igmp_max_memberships = 20; 18441714020eSNikolay Borisov net->ipv4.sysctl_igmp_max_msf = 10; 18451714020eSNikolay Borisov /* IGMP reports for link-local multicast groups are enabled by default */ 18461714020eSNikolay Borisov net->ipv4.sysctl_igmp_llm_reports = 1; 18471714020eSNikolay Borisov net->ipv4.sysctl_igmp_qrv = 2; 18481714020eSNikolay Borisov 1849c9d8f1a6SCong Wang return 0; 1850c9d8f1a6SCong Wang } 1851c9d8f1a6SCong Wang 1852c9d8f1a6SCong Wang static __net_initdata struct pernet_operations af_inet_ops = { 1853c9d8f1a6SCong Wang .init = inet_init_net, 1854c9d8f1a6SCong Wang }; 1855c9d8f1a6SCong Wang 1856c9d8f1a6SCong Wang static int __init init_inet_pernet_ops(void) 1857c9d8f1a6SCong Wang { 1858c9d8f1a6SCong Wang return register_pernet_subsys(&af_inet_ops); 1859c9d8f1a6SCong Wang } 1860c9d8f1a6SCong Wang 18611da177e4SLinus Torvalds static int ipv4_proc_init(void); 18621da177e4SLinus Torvalds 186330e224d7SHerbert Xu /* 186430e224d7SHerbert Xu * IP protocol layer initialiser 186530e224d7SHerbert Xu */ 186630e224d7SHerbert Xu 186722061d80SVlad Yasevich static struct packet_offload ip_packet_offload __read_mostly = { 186822061d80SVlad Yasevich .type = cpu_to_be16(ETH_P_IP), 1869f191a1d1SVlad Yasevich .callbacks = { 1870f4c50d99SHerbert Xu .gso_segment = inet_gso_segment, 187173cc19f1SHerbert Xu .gro_receive = inet_gro_receive, 187273cc19f1SHerbert Xu .gro_complete = inet_gro_complete, 1873f191a1d1SVlad Yasevich }, 187430e224d7SHerbert Xu }; 187530e224d7SHerbert Xu 1876cb32f511SEric Dumazet static const struct net_offload ipip_offload = { 1877cb32f511SEric Dumazet .callbacks = { 1878418e897eSWillem de Bruijn .gso_segment = ipip_gso_segment, 1879fac8e0f5SJesse Gross .gro_receive = ipip_gro_receive, 1880b8cba75bSJesse Gross .gro_complete = ipip_gro_complete, 1881cb32f511SEric Dumazet }, 1882cb32f511SEric Dumazet }; 1883cb32f511SEric Dumazet 188493b1b31fSTonghao Zhang static int __init ipip_offload_init(void) 188593b1b31fSTonghao Zhang { 188693b1b31fSTonghao Zhang return inet_add_offload(&ipip_offload, IPPROTO_IPIP); 188793b1b31fSTonghao Zhang } 188893b1b31fSTonghao Zhang 1889808a8f88SVlad Yasevich static int __init ipv4_offload_init(void) 1890808a8f88SVlad Yasevich { 1891808a8f88SVlad Yasevich /* 1892808a8f88SVlad Yasevich * Add offloads 1893808a8f88SVlad Yasevich */ 1894da5bab07SDaniel Borkmann if (udpv4_offload_init() < 0) 1895808a8f88SVlad Yasevich pr_crit("%s: Cannot add UDP protocol offload\n", __func__); 189628850dc7SDaniel Borkmann if (tcpv4_offload_init() < 0) 189728850dc7SDaniel Borkmann pr_crit("%s: Cannot add TCP protocol offload\n", __func__); 189893b1b31fSTonghao Zhang if (ipip_offload_init() < 0) 189993b1b31fSTonghao Zhang pr_crit("%s: Cannot add IPIP protocol offload\n", __func__); 1900808a8f88SVlad Yasevich 1901808a8f88SVlad Yasevich dev_add_offload(&ip_packet_offload); 1902808a8f88SVlad Yasevich return 0; 1903808a8f88SVlad Yasevich } 1904808a8f88SVlad Yasevich 1905808a8f88SVlad Yasevich fs_initcall(ipv4_offload_init); 1906808a8f88SVlad Yasevich 1907808a8f88SVlad Yasevich static struct packet_type ip_packet_type __read_mostly = { 1908808a8f88SVlad Yasevich .type = cpu_to_be16(ETH_P_IP), 1909808a8f88SVlad Yasevich .func = ip_rcv, 191017266ee9SEdward Cree .list_func = ip_list_rcv, 1911808a8f88SVlad Yasevich }; 1912808a8f88SVlad Yasevich 19131da177e4SLinus Torvalds static int __init inet_init(void) 19141da177e4SLinus Torvalds { 19151da177e4SLinus Torvalds struct inet_protosw *q; 19161da177e4SLinus Torvalds struct list_head *r; 19171da177e4SLinus Torvalds int rc = -EINVAL; 19181da177e4SLinus Torvalds 1919b4772ef8SEyal Birger sock_skb_cb_check_size(sizeof(struct inet_skb_parm)); 19201da177e4SLinus Torvalds 19211da177e4SLinus Torvalds rc = proto_register(&tcp_prot, 1); 19221da177e4SLinus Torvalds if (rc) 1923122ff243SWANG Cong goto out; 19241da177e4SLinus Torvalds 19251da177e4SLinus Torvalds rc = proto_register(&udp_prot, 1); 19261da177e4SLinus Torvalds if (rc) 19271da177e4SLinus Torvalds goto out_unregister_tcp_proto; 19281da177e4SLinus Torvalds 19291da177e4SLinus Torvalds rc = proto_register(&raw_prot, 1); 19301da177e4SLinus Torvalds if (rc) 19311da177e4SLinus Torvalds goto out_unregister_udp_proto; 19321da177e4SLinus Torvalds 1933c319b4d7SVasiliy Kulikov rc = proto_register(&ping_prot, 1); 1934c319b4d7SVasiliy Kulikov if (rc) 1935c319b4d7SVasiliy Kulikov goto out_unregister_raw_proto; 1936c319b4d7SVasiliy Kulikov 19371da177e4SLinus Torvalds /* 19381da177e4SLinus Torvalds * Tell SOCKET that we are alive... 19391da177e4SLinus Torvalds */ 19401da177e4SLinus Torvalds 19411da177e4SLinus Torvalds (void)sock_register(&inet_family_ops); 19421da177e4SLinus Torvalds 1943bd7b1533SAl Viro #ifdef CONFIG_SYSCTL 1944bd7b1533SAl Viro ip_static_sysctl_init(); 1945bd7b1533SAl Viro #endif 1946bd7b1533SAl Viro 19471da177e4SLinus Torvalds /* 19481da177e4SLinus Torvalds * Add all the base protocols. 19491da177e4SLinus Torvalds */ 19501da177e4SLinus Torvalds 19511da177e4SLinus Torvalds if (inet_add_protocol(&icmp_protocol, IPPROTO_ICMP) < 0) 1952058bd4d2SJoe Perches pr_crit("%s: Cannot add ICMP protocol\n", __func__); 19531da177e4SLinus Torvalds if (inet_add_protocol(&udp_protocol, IPPROTO_UDP) < 0) 1954058bd4d2SJoe Perches pr_crit("%s: Cannot add UDP protocol\n", __func__); 19551da177e4SLinus Torvalds if (inet_add_protocol(&tcp_protocol, IPPROTO_TCP) < 0) 1956058bd4d2SJoe Perches pr_crit("%s: Cannot add TCP protocol\n", __func__); 19571da177e4SLinus Torvalds #ifdef CONFIG_IP_MULTICAST 19581da177e4SLinus Torvalds if (inet_add_protocol(&igmp_protocol, IPPROTO_IGMP) < 0) 1959058bd4d2SJoe Perches pr_crit("%s: Cannot add IGMP protocol\n", __func__); 19601da177e4SLinus Torvalds #endif 19611da177e4SLinus Torvalds 19621da177e4SLinus Torvalds /* Register the socket-side information for inet_create. */ 19631da177e4SLinus Torvalds for (r = &inetsw[0]; r < &inetsw[SOCK_MAX]; ++r) 19641da177e4SLinus Torvalds INIT_LIST_HEAD(r); 19651da177e4SLinus Torvalds 19661da177e4SLinus Torvalds for (q = inetsw_array; q < &inetsw_array[INETSW_ARRAY_LEN]; ++q) 19671da177e4SLinus Torvalds inet_register_protosw(q); 19681da177e4SLinus Torvalds 19691da177e4SLinus Torvalds /* 19701da177e4SLinus Torvalds * Set the ARP module up 19711da177e4SLinus Torvalds */ 19721da177e4SLinus Torvalds 19731da177e4SLinus Torvalds arp_init(); 19741da177e4SLinus Torvalds 19751da177e4SLinus Torvalds /* 19761da177e4SLinus Torvalds * Set the IP module up 19771da177e4SLinus Torvalds */ 19781da177e4SLinus Torvalds 19791da177e4SLinus Torvalds ip_init(); 19801da177e4SLinus Torvalds 19811da177e4SLinus Torvalds /* Setup TCP slab cache for open requests. */ 19821da177e4SLinus Torvalds tcp_init(); 19831da177e4SLinus Torvalds 198495766fffSHideo Aoki /* Setup UDP memory threshold */ 198595766fffSHideo Aoki udp_init(); 198695766fffSHideo Aoki 1987ba4e58ecSGerrit Renker /* Add UDP-Lite (RFC 3828) */ 1988ba4e58ecSGerrit Renker udplite4_register(); 19891da177e4SLinus Torvalds 19906897445fSMike Manning raw_init(); 19916897445fSMike Manning 1992c319b4d7SVasiliy Kulikov ping_init(); 1993c319b4d7SVasiliy Kulikov 19941da177e4SLinus Torvalds /* 19951da177e4SLinus Torvalds * Set the ICMP layer up 19961da177e4SLinus Torvalds */ 19971da177e4SLinus Torvalds 1998a5710d65SDenis V. Lunev if (icmp_init() < 0) 1999a5710d65SDenis V. Lunev panic("Failed to create the ICMP control socket.\n"); 20001da177e4SLinus Torvalds 20011da177e4SLinus Torvalds /* 20021da177e4SLinus Torvalds * Initialise the multicast router 20031da177e4SLinus Torvalds */ 20041da177e4SLinus Torvalds #if defined(CONFIG_IP_MROUTE) 200503d2f897SWang Chen if (ip_mr_init()) 2006058bd4d2SJoe Perches pr_crit("%s: Cannot init ipv4 mroute\n", __func__); 20071da177e4SLinus Torvalds #endif 2008c9d8f1a6SCong Wang 2009c9d8f1a6SCong Wang if (init_inet_pernet_ops()) 2010c9d8f1a6SCong Wang pr_crit("%s: Cannot init ipv4 inet pernet ops\n", __func__); 20111da177e4SLinus Torvalds /* 20121da177e4SLinus Torvalds * Initialise per-cpu ipv4 mibs 20131da177e4SLinus Torvalds */ 20141da177e4SLinus Torvalds 20151da177e4SLinus Torvalds if (init_ipv4_mibs()) 2016058bd4d2SJoe Perches pr_crit("%s: Cannot init ipv4 mibs\n", __func__); 20171da177e4SLinus Torvalds 20181da177e4SLinus Torvalds ipv4_proc_init(); 20191da177e4SLinus Torvalds 20201da177e4SLinus Torvalds ipfrag_init(); 20211da177e4SLinus Torvalds 202230e224d7SHerbert Xu dev_add_pack(&ip_packet_type); 202330e224d7SHerbert Xu 2024045a0fa0SThomas Graf ip_tunnel_core_init(); 2025045a0fa0SThomas Graf 20261da177e4SLinus Torvalds rc = 0; 20271da177e4SLinus Torvalds out: 20281da177e4SLinus Torvalds return rc; 2029c319b4d7SVasiliy Kulikov out_unregister_raw_proto: 2030c319b4d7SVasiliy Kulikov proto_unregister(&raw_prot); 20311da177e4SLinus Torvalds out_unregister_udp_proto: 20321da177e4SLinus Torvalds proto_unregister(&udp_prot); 2033321efff7SOlaf Kirch out_unregister_tcp_proto: 2034321efff7SOlaf Kirch proto_unregister(&tcp_prot); 20351da177e4SLinus Torvalds goto out; 20361da177e4SLinus Torvalds } 20371da177e4SLinus Torvalds 2038a536e077SHeiko Carstens fs_initcall(inet_init); 20391da177e4SLinus Torvalds 20401da177e4SLinus Torvalds /* ------------------------------------------------------------------------ */ 20411da177e4SLinus Torvalds 20421da177e4SLinus Torvalds #ifdef CONFIG_PROC_FS 20431da177e4SLinus Torvalds static int __init ipv4_proc_init(void) 20441da177e4SLinus Torvalds { 20451da177e4SLinus Torvalds int rc = 0; 20461da177e4SLinus Torvalds 20471da177e4SLinus Torvalds if (raw_proc_init()) 20481da177e4SLinus Torvalds goto out_raw; 20491da177e4SLinus Torvalds if (tcp4_proc_init()) 20501da177e4SLinus Torvalds goto out_tcp; 20511da177e4SLinus Torvalds if (udp4_proc_init()) 20521da177e4SLinus Torvalds goto out_udp; 2053c319b4d7SVasiliy Kulikov if (ping_proc_init()) 2054c319b4d7SVasiliy Kulikov goto out_ping; 20551da177e4SLinus Torvalds if (ip_misc_proc_init()) 20561da177e4SLinus Torvalds goto out_misc; 20571da177e4SLinus Torvalds out: 20581da177e4SLinus Torvalds return rc; 20591da177e4SLinus Torvalds out_misc: 2060c319b4d7SVasiliy Kulikov ping_proc_exit(); 2061c319b4d7SVasiliy Kulikov out_ping: 20621da177e4SLinus Torvalds udp4_proc_exit(); 20631da177e4SLinus Torvalds out_udp: 20641da177e4SLinus Torvalds tcp4_proc_exit(); 20651da177e4SLinus Torvalds out_tcp: 20661da177e4SLinus Torvalds raw_proc_exit(); 20671da177e4SLinus Torvalds out_raw: 20681da177e4SLinus Torvalds rc = -ENOMEM; 20691da177e4SLinus Torvalds goto out; 20701da177e4SLinus Torvalds } 20711da177e4SLinus Torvalds 20721da177e4SLinus Torvalds #else /* CONFIG_PROC_FS */ 20731da177e4SLinus Torvalds static int __init ipv4_proc_init(void) 20741da177e4SLinus Torvalds { 20751da177e4SLinus Torvalds return 0; 20761da177e4SLinus Torvalds } 20771da177e4SLinus Torvalds #endif /* CONFIG_PROC_FS */ 2078