11da177e4SLinus Torvalds /* 21da177e4SLinus Torvalds * INET An implementation of the TCP/IP protocol suite for the LINUX 31da177e4SLinus Torvalds * operating system. INET is implemented using the BSD Socket 41da177e4SLinus Torvalds * interface as the means of communication with the user level. 51da177e4SLinus Torvalds * 61da177e4SLinus Torvalds * The User Datagram Protocol (UDP). 71da177e4SLinus Torvalds * 81da177e4SLinus Torvalds * Version: $Id: udp.c,v 1.102 2002/02/01 22:01:04 davem Exp $ 91da177e4SLinus Torvalds * 1002c30a84SJesper Juhl * Authors: Ross Biro 111da177e4SLinus Torvalds * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG> 121da177e4SLinus Torvalds * Arnt Gulbrandsen, <agulbra@nvg.unit.no> 131da177e4SLinus Torvalds * Alan Cox, <Alan.Cox@linux.org> 141da177e4SLinus Torvalds * Hirokazu Takahashi, <taka@valinux.co.jp> 151da177e4SLinus Torvalds * 161da177e4SLinus Torvalds * Fixes: 171da177e4SLinus Torvalds * Alan Cox : verify_area() calls 181da177e4SLinus Torvalds * Alan Cox : stopped close while in use off icmp 191da177e4SLinus Torvalds * messages. Not a fix but a botch that 201da177e4SLinus Torvalds * for udp at least is 'valid'. 211da177e4SLinus Torvalds * Alan Cox : Fixed icmp handling properly 221da177e4SLinus Torvalds * Alan Cox : Correct error for oversized datagrams 231da177e4SLinus Torvalds * Alan Cox : Tidied select() semantics. 241da177e4SLinus Torvalds * Alan Cox : udp_err() fixed properly, also now 251da177e4SLinus Torvalds * select and read wake correctly on errors 261da177e4SLinus Torvalds * Alan Cox : udp_send verify_area moved to avoid mem leak 271da177e4SLinus Torvalds * Alan Cox : UDP can count its memory 281da177e4SLinus Torvalds * Alan Cox : send to an unknown connection causes 291da177e4SLinus Torvalds * an ECONNREFUSED off the icmp, but 301da177e4SLinus Torvalds * does NOT close. 311da177e4SLinus Torvalds * Alan Cox : Switched to new sk_buff handlers. No more backlog! 321da177e4SLinus Torvalds * Alan Cox : Using generic datagram code. Even smaller and the PEEK 331da177e4SLinus Torvalds * bug no longer crashes it. 341da177e4SLinus Torvalds * Fred Van Kempen : Net2e support for sk->broadcast. 351da177e4SLinus Torvalds * Alan Cox : Uses skb_free_datagram 361da177e4SLinus Torvalds * Alan Cox : Added get/set sockopt support. 371da177e4SLinus Torvalds * Alan Cox : Broadcasting without option set returns EACCES. 381da177e4SLinus Torvalds * Alan Cox : No wakeup calls. Instead we now use the callbacks. 391da177e4SLinus Torvalds * Alan Cox : Use ip_tos and ip_ttl 401da177e4SLinus Torvalds * Alan Cox : SNMP Mibs 411da177e4SLinus Torvalds * Alan Cox : MSG_DONTROUTE, and 0.0.0.0 support. 421da177e4SLinus Torvalds * Matt Dillon : UDP length checks. 431da177e4SLinus Torvalds * Alan Cox : Smarter af_inet used properly. 441da177e4SLinus Torvalds * Alan Cox : Use new kernel side addressing. 451da177e4SLinus Torvalds * Alan Cox : Incorrect return on truncated datagram receive. 461da177e4SLinus Torvalds * Arnt Gulbrandsen : New udp_send and stuff 471da177e4SLinus Torvalds * Alan Cox : Cache last socket 481da177e4SLinus Torvalds * Alan Cox : Route cache 491da177e4SLinus Torvalds * Jon Peatfield : Minor efficiency fix to sendto(). 501da177e4SLinus Torvalds * Mike Shaver : RFC1122 checks. 511da177e4SLinus Torvalds * Alan Cox : Nonblocking error fix. 521da177e4SLinus Torvalds * Willy Konynenberg : Transparent proxying support. 531da177e4SLinus Torvalds * Mike McLagan : Routing by source 541da177e4SLinus Torvalds * David S. Miller : New socket lookup architecture. 551da177e4SLinus Torvalds * Last socket cache retained as it 561da177e4SLinus Torvalds * does have a high hit rate. 571da177e4SLinus Torvalds * Olaf Kirch : Don't linearise iovec on sendmsg. 581da177e4SLinus Torvalds * Andi Kleen : Some cleanups, cache destination entry 591da177e4SLinus Torvalds * for connect. 601da177e4SLinus Torvalds * Vitaly E. Lavrov : Transparent proxy revived after year coma. 611da177e4SLinus Torvalds * Melvin Smith : Check msg_name not msg_namelen in sendto(), 621da177e4SLinus Torvalds * return ENOTCONN for unconnected sockets (POSIX) 631da177e4SLinus Torvalds * Janos Farkas : don't deliver multi/broadcasts to a different 641da177e4SLinus Torvalds * bound-to-device socket 651da177e4SLinus Torvalds * Hirokazu Takahashi : HW checksumming for outgoing UDP 661da177e4SLinus Torvalds * datagrams. 671da177e4SLinus Torvalds * Hirokazu Takahashi : sendfile() on UDP works now. 681da177e4SLinus Torvalds * Arnaldo C. Melo : convert /proc/net/udp to seq_file 691da177e4SLinus Torvalds * YOSHIFUJI Hideaki @USAGI and: Support IPV6_V6ONLY socket option, which 701da177e4SLinus Torvalds * Alexey Kuznetsov: allow both IPv4 and IPv6 sockets to bind 711da177e4SLinus Torvalds * a single port at the same time. 721da177e4SLinus Torvalds * Derek Atkins <derek@ihtfp.com>: Add Encapulation Support 731da177e4SLinus Torvalds * 741da177e4SLinus Torvalds * 751da177e4SLinus Torvalds * This program is free software; you can redistribute it and/or 761da177e4SLinus Torvalds * modify it under the terms of the GNU General Public License 771da177e4SLinus Torvalds * as published by the Free Software Foundation; either version 781da177e4SLinus Torvalds * 2 of the License, or (at your option) any later version. 791da177e4SLinus Torvalds */ 801da177e4SLinus Torvalds 811da177e4SLinus Torvalds #include <asm/system.h> 821da177e4SLinus Torvalds #include <asm/uaccess.h> 831da177e4SLinus Torvalds #include <asm/ioctls.h> 841da177e4SLinus Torvalds #include <linux/types.h> 851da177e4SLinus Torvalds #include <linux/fcntl.h> 861da177e4SLinus Torvalds #include <linux/module.h> 871da177e4SLinus Torvalds #include <linux/socket.h> 881da177e4SLinus Torvalds #include <linux/sockios.h> 891da177e4SLinus Torvalds #include <linux/in.h> 901da177e4SLinus Torvalds #include <linux/errno.h> 911da177e4SLinus Torvalds #include <linux/timer.h> 921da177e4SLinus Torvalds #include <linux/mm.h> 931da177e4SLinus Torvalds #include <linux/config.h> 941da177e4SLinus Torvalds #include <linux/inet.h> 951da177e4SLinus Torvalds #include <linux/ipv6.h> 961da177e4SLinus Torvalds #include <linux/netdevice.h> 971da177e4SLinus Torvalds #include <net/snmp.h> 98c752f073SArnaldo Carvalho de Melo #include <net/ip.h> 99c752f073SArnaldo Carvalho de Melo #include <net/tcp_states.h> 1001da177e4SLinus Torvalds #include <net/protocol.h> 1011da177e4SLinus Torvalds #include <linux/skbuff.h> 1021da177e4SLinus Torvalds #include <linux/proc_fs.h> 1031da177e4SLinus Torvalds #include <linux/seq_file.h> 1041da177e4SLinus Torvalds #include <net/sock.h> 1051da177e4SLinus Torvalds #include <net/udp.h> 1061da177e4SLinus Torvalds #include <net/icmp.h> 1071da177e4SLinus Torvalds #include <net/route.h> 1081da177e4SLinus Torvalds #include <net/inet_common.h> 1091da177e4SLinus Torvalds #include <net/checksum.h> 1101da177e4SLinus Torvalds #include <net/xfrm.h> 1111da177e4SLinus Torvalds 1121da177e4SLinus Torvalds /* 1131da177e4SLinus Torvalds * Snmp MIB for the UDP layer 1141da177e4SLinus Torvalds */ 1151da177e4SLinus Torvalds 116ba89966cSEric Dumazet DEFINE_SNMP_STAT(struct udp_mib, udp_statistics) __read_mostly; 1171da177e4SLinus Torvalds 1181da177e4SLinus Torvalds struct hlist_head udp_hash[UDP_HTABLE_SIZE]; 1191da177e4SLinus Torvalds DEFINE_RWLOCK(udp_hash_lock); 1201da177e4SLinus Torvalds 1211da177e4SLinus Torvalds /* Shared by v4/v6 udp. */ 1221da177e4SLinus Torvalds int udp_port_rover; 1231da177e4SLinus Torvalds 1241da177e4SLinus Torvalds static int udp_v4_get_port(struct sock *sk, unsigned short snum) 1251da177e4SLinus Torvalds { 1261da177e4SLinus Torvalds struct hlist_node *node; 1271da177e4SLinus Torvalds struct sock *sk2; 1281da177e4SLinus Torvalds struct inet_sock *inet = inet_sk(sk); 1291da177e4SLinus Torvalds 1301da177e4SLinus Torvalds write_lock_bh(&udp_hash_lock); 1311da177e4SLinus Torvalds if (snum == 0) { 1321da177e4SLinus Torvalds int best_size_so_far, best, result, i; 1331da177e4SLinus Torvalds 1341da177e4SLinus Torvalds if (udp_port_rover > sysctl_local_port_range[1] || 1351da177e4SLinus Torvalds udp_port_rover < sysctl_local_port_range[0]) 1361da177e4SLinus Torvalds udp_port_rover = sysctl_local_port_range[0]; 1371da177e4SLinus Torvalds best_size_so_far = 32767; 1381da177e4SLinus Torvalds best = result = udp_port_rover; 1391da177e4SLinus Torvalds for (i = 0; i < UDP_HTABLE_SIZE; i++, result++) { 1401da177e4SLinus Torvalds struct hlist_head *list; 1411da177e4SLinus Torvalds int size; 1421da177e4SLinus Torvalds 1431da177e4SLinus Torvalds list = &udp_hash[result & (UDP_HTABLE_SIZE - 1)]; 1441da177e4SLinus Torvalds if (hlist_empty(list)) { 1451da177e4SLinus Torvalds if (result > sysctl_local_port_range[1]) 1461da177e4SLinus Torvalds result = sysctl_local_port_range[0] + 1471da177e4SLinus Torvalds ((result - sysctl_local_port_range[0]) & 1481da177e4SLinus Torvalds (UDP_HTABLE_SIZE - 1)); 1491da177e4SLinus Torvalds goto gotit; 1501da177e4SLinus Torvalds } 1511da177e4SLinus Torvalds size = 0; 1521da177e4SLinus Torvalds sk_for_each(sk2, node, list) 1531da177e4SLinus Torvalds if (++size >= best_size_so_far) 1541da177e4SLinus Torvalds goto next; 1551da177e4SLinus Torvalds best_size_so_far = size; 1561da177e4SLinus Torvalds best = result; 1571da177e4SLinus Torvalds next:; 1581da177e4SLinus Torvalds } 1591da177e4SLinus Torvalds result = best; 1601da177e4SLinus Torvalds for(i = 0; i < (1 << 16) / UDP_HTABLE_SIZE; i++, result += UDP_HTABLE_SIZE) { 1611da177e4SLinus Torvalds if (result > sysctl_local_port_range[1]) 1621da177e4SLinus Torvalds result = sysctl_local_port_range[0] 1631da177e4SLinus Torvalds + ((result - sysctl_local_port_range[0]) & 1641da177e4SLinus Torvalds (UDP_HTABLE_SIZE - 1)); 1651da177e4SLinus Torvalds if (!udp_lport_inuse(result)) 1661da177e4SLinus Torvalds break; 1671da177e4SLinus Torvalds } 1681da177e4SLinus Torvalds if (i >= (1 << 16) / UDP_HTABLE_SIZE) 1691da177e4SLinus Torvalds goto fail; 1701da177e4SLinus Torvalds gotit: 1711da177e4SLinus Torvalds udp_port_rover = snum = result; 1721da177e4SLinus Torvalds } else { 1731da177e4SLinus Torvalds sk_for_each(sk2, node, 1741da177e4SLinus Torvalds &udp_hash[snum & (UDP_HTABLE_SIZE - 1)]) { 1751da177e4SLinus Torvalds struct inet_sock *inet2 = inet_sk(sk2); 1761da177e4SLinus Torvalds 1771da177e4SLinus Torvalds if (inet2->num == snum && 1781da177e4SLinus Torvalds sk2 != sk && 1791da177e4SLinus Torvalds !ipv6_only_sock(sk2) && 1801da177e4SLinus Torvalds (!sk2->sk_bound_dev_if || 1811da177e4SLinus Torvalds !sk->sk_bound_dev_if || 1821da177e4SLinus Torvalds sk2->sk_bound_dev_if == sk->sk_bound_dev_if) && 1831da177e4SLinus Torvalds (!inet2->rcv_saddr || 1841da177e4SLinus Torvalds !inet->rcv_saddr || 1851da177e4SLinus Torvalds inet2->rcv_saddr == inet->rcv_saddr) && 1861da177e4SLinus Torvalds (!sk2->sk_reuse || !sk->sk_reuse)) 1871da177e4SLinus Torvalds goto fail; 1881da177e4SLinus Torvalds } 1891da177e4SLinus Torvalds } 1901da177e4SLinus Torvalds inet->num = snum; 1911da177e4SLinus Torvalds if (sk_unhashed(sk)) { 1921da177e4SLinus Torvalds struct hlist_head *h = &udp_hash[snum & (UDP_HTABLE_SIZE - 1)]; 1931da177e4SLinus Torvalds 1941da177e4SLinus Torvalds sk_add_node(sk, h); 1951da177e4SLinus Torvalds sock_prot_inc_use(sk->sk_prot); 1961da177e4SLinus Torvalds } 1971da177e4SLinus Torvalds write_unlock_bh(&udp_hash_lock); 1981da177e4SLinus Torvalds return 0; 1991da177e4SLinus Torvalds 2001da177e4SLinus Torvalds fail: 2011da177e4SLinus Torvalds write_unlock_bh(&udp_hash_lock); 2021da177e4SLinus Torvalds return 1; 2031da177e4SLinus Torvalds } 2041da177e4SLinus Torvalds 2051da177e4SLinus Torvalds static void udp_v4_hash(struct sock *sk) 2061da177e4SLinus Torvalds { 2071da177e4SLinus Torvalds BUG(); 2081da177e4SLinus Torvalds } 2091da177e4SLinus Torvalds 2101da177e4SLinus Torvalds static void udp_v4_unhash(struct sock *sk) 2111da177e4SLinus Torvalds { 2121da177e4SLinus Torvalds write_lock_bh(&udp_hash_lock); 2131da177e4SLinus Torvalds if (sk_del_node_init(sk)) { 2141da177e4SLinus Torvalds inet_sk(sk)->num = 0; 2151da177e4SLinus Torvalds sock_prot_dec_use(sk->sk_prot); 2161da177e4SLinus Torvalds } 2171da177e4SLinus Torvalds write_unlock_bh(&udp_hash_lock); 2181da177e4SLinus Torvalds } 2191da177e4SLinus Torvalds 2201da177e4SLinus Torvalds /* UDP is nearly always wildcards out the wazoo, it makes no sense to try 2211da177e4SLinus Torvalds * harder than this. -DaveM 2221da177e4SLinus Torvalds */ 2231da177e4SLinus Torvalds static struct sock *udp_v4_lookup_longway(u32 saddr, u16 sport, 2241da177e4SLinus Torvalds u32 daddr, u16 dport, int dif) 2251da177e4SLinus Torvalds { 2261da177e4SLinus Torvalds struct sock *sk, *result = NULL; 2271da177e4SLinus Torvalds struct hlist_node *node; 2281da177e4SLinus Torvalds unsigned short hnum = ntohs(dport); 2291da177e4SLinus Torvalds int badness = -1; 2301da177e4SLinus Torvalds 2311da177e4SLinus Torvalds sk_for_each(sk, node, &udp_hash[hnum & (UDP_HTABLE_SIZE - 1)]) { 2321da177e4SLinus Torvalds struct inet_sock *inet = inet_sk(sk); 2331da177e4SLinus Torvalds 2341da177e4SLinus Torvalds if (inet->num == hnum && !ipv6_only_sock(sk)) { 2351da177e4SLinus Torvalds int score = (sk->sk_family == PF_INET ? 1 : 0); 2361da177e4SLinus Torvalds if (inet->rcv_saddr) { 2371da177e4SLinus Torvalds if (inet->rcv_saddr != daddr) 2381da177e4SLinus Torvalds continue; 2391da177e4SLinus Torvalds score+=2; 2401da177e4SLinus Torvalds } 2411da177e4SLinus Torvalds if (inet->daddr) { 2421da177e4SLinus Torvalds if (inet->daddr != saddr) 2431da177e4SLinus Torvalds continue; 2441da177e4SLinus Torvalds score+=2; 2451da177e4SLinus Torvalds } 2461da177e4SLinus Torvalds if (inet->dport) { 2471da177e4SLinus Torvalds if (inet->dport != sport) 2481da177e4SLinus Torvalds continue; 2491da177e4SLinus Torvalds score+=2; 2501da177e4SLinus Torvalds } 2511da177e4SLinus Torvalds if (sk->sk_bound_dev_if) { 2521da177e4SLinus Torvalds if (sk->sk_bound_dev_if != dif) 2531da177e4SLinus Torvalds continue; 2541da177e4SLinus Torvalds score+=2; 2551da177e4SLinus Torvalds } 2561da177e4SLinus Torvalds if(score == 9) { 2571da177e4SLinus Torvalds result = sk; 2581da177e4SLinus Torvalds break; 2591da177e4SLinus Torvalds } else if(score > badness) { 2601da177e4SLinus Torvalds result = sk; 2611da177e4SLinus Torvalds badness = score; 2621da177e4SLinus Torvalds } 2631da177e4SLinus Torvalds } 2641da177e4SLinus Torvalds } 2651da177e4SLinus Torvalds return result; 2661da177e4SLinus Torvalds } 2671da177e4SLinus Torvalds 2681da177e4SLinus Torvalds static __inline__ struct sock *udp_v4_lookup(u32 saddr, u16 sport, 2691da177e4SLinus Torvalds u32 daddr, u16 dport, int dif) 2701da177e4SLinus Torvalds { 2711da177e4SLinus Torvalds struct sock *sk; 2721da177e4SLinus Torvalds 2731da177e4SLinus Torvalds read_lock(&udp_hash_lock); 2741da177e4SLinus Torvalds sk = udp_v4_lookup_longway(saddr, sport, daddr, dport, dif); 2751da177e4SLinus Torvalds if (sk) 2761da177e4SLinus Torvalds sock_hold(sk); 2771da177e4SLinus Torvalds read_unlock(&udp_hash_lock); 2781da177e4SLinus Torvalds return sk; 2791da177e4SLinus Torvalds } 2801da177e4SLinus Torvalds 2811da177e4SLinus Torvalds static inline struct sock *udp_v4_mcast_next(struct sock *sk, 2821da177e4SLinus Torvalds u16 loc_port, u32 loc_addr, 2831da177e4SLinus Torvalds u16 rmt_port, u32 rmt_addr, 2841da177e4SLinus Torvalds int dif) 2851da177e4SLinus Torvalds { 2861da177e4SLinus Torvalds struct hlist_node *node; 2871da177e4SLinus Torvalds struct sock *s = sk; 2881da177e4SLinus Torvalds unsigned short hnum = ntohs(loc_port); 2891da177e4SLinus Torvalds 2901da177e4SLinus Torvalds sk_for_each_from(s, node) { 2911da177e4SLinus Torvalds struct inet_sock *inet = inet_sk(s); 2921da177e4SLinus Torvalds 2931da177e4SLinus Torvalds if (inet->num != hnum || 2941da177e4SLinus Torvalds (inet->daddr && inet->daddr != rmt_addr) || 2951da177e4SLinus Torvalds (inet->dport != rmt_port && inet->dport) || 2961da177e4SLinus Torvalds (inet->rcv_saddr && inet->rcv_saddr != loc_addr) || 2971da177e4SLinus Torvalds ipv6_only_sock(s) || 2981da177e4SLinus Torvalds (s->sk_bound_dev_if && s->sk_bound_dev_if != dif)) 2991da177e4SLinus Torvalds continue; 3001da177e4SLinus Torvalds if (!ip_mc_sf_allow(s, loc_addr, rmt_addr, dif)) 3011da177e4SLinus Torvalds continue; 3021da177e4SLinus Torvalds goto found; 3031da177e4SLinus Torvalds } 3041da177e4SLinus Torvalds s = NULL; 3051da177e4SLinus Torvalds found: 3061da177e4SLinus Torvalds return s; 3071da177e4SLinus Torvalds } 3081da177e4SLinus Torvalds 3091da177e4SLinus Torvalds /* 3101da177e4SLinus Torvalds * This routine is called by the ICMP module when it gets some 3111da177e4SLinus Torvalds * sort of error condition. If err < 0 then the socket should 3121da177e4SLinus Torvalds * be closed and the error returned to the user. If err > 0 3131da177e4SLinus Torvalds * it's just the icmp type << 8 | icmp code. 3141da177e4SLinus Torvalds * Header points to the ip header of the error packet. We move 3151da177e4SLinus Torvalds * on past this. Then (as it used to claim before adjustment) 3161da177e4SLinus Torvalds * header points to the first 8 bytes of the udp header. We need 3171da177e4SLinus Torvalds * to find the appropriate port. 3181da177e4SLinus Torvalds */ 3191da177e4SLinus Torvalds 3201da177e4SLinus Torvalds void udp_err(struct sk_buff *skb, u32 info) 3211da177e4SLinus Torvalds { 3221da177e4SLinus Torvalds struct inet_sock *inet; 3231da177e4SLinus Torvalds struct iphdr *iph = (struct iphdr*)skb->data; 3241da177e4SLinus Torvalds struct udphdr *uh = (struct udphdr*)(skb->data+(iph->ihl<<2)); 3251da177e4SLinus Torvalds int type = skb->h.icmph->type; 3261da177e4SLinus Torvalds int code = skb->h.icmph->code; 3271da177e4SLinus Torvalds struct sock *sk; 3281da177e4SLinus Torvalds int harderr; 3291da177e4SLinus Torvalds int err; 3301da177e4SLinus Torvalds 3311da177e4SLinus Torvalds sk = udp_v4_lookup(iph->daddr, uh->dest, iph->saddr, uh->source, skb->dev->ifindex); 3321da177e4SLinus Torvalds if (sk == NULL) { 3331da177e4SLinus Torvalds ICMP_INC_STATS_BH(ICMP_MIB_INERRORS); 3341da177e4SLinus Torvalds return; /* No socket for error */ 3351da177e4SLinus Torvalds } 3361da177e4SLinus Torvalds 3371da177e4SLinus Torvalds err = 0; 3381da177e4SLinus Torvalds harderr = 0; 3391da177e4SLinus Torvalds inet = inet_sk(sk); 3401da177e4SLinus Torvalds 3411da177e4SLinus Torvalds switch (type) { 3421da177e4SLinus Torvalds default: 3431da177e4SLinus Torvalds case ICMP_TIME_EXCEEDED: 3441da177e4SLinus Torvalds err = EHOSTUNREACH; 3451da177e4SLinus Torvalds break; 3461da177e4SLinus Torvalds case ICMP_SOURCE_QUENCH: 3471da177e4SLinus Torvalds goto out; 3481da177e4SLinus Torvalds case ICMP_PARAMETERPROB: 3491da177e4SLinus Torvalds err = EPROTO; 3501da177e4SLinus Torvalds harderr = 1; 3511da177e4SLinus Torvalds break; 3521da177e4SLinus Torvalds case ICMP_DEST_UNREACH: 3531da177e4SLinus Torvalds if (code == ICMP_FRAG_NEEDED) { /* Path MTU discovery */ 3541da177e4SLinus Torvalds if (inet->pmtudisc != IP_PMTUDISC_DONT) { 3551da177e4SLinus Torvalds err = EMSGSIZE; 3561da177e4SLinus Torvalds harderr = 1; 3571da177e4SLinus Torvalds break; 3581da177e4SLinus Torvalds } 3591da177e4SLinus Torvalds goto out; 3601da177e4SLinus Torvalds } 3611da177e4SLinus Torvalds err = EHOSTUNREACH; 3621da177e4SLinus Torvalds if (code <= NR_ICMP_UNREACH) { 3631da177e4SLinus Torvalds harderr = icmp_err_convert[code].fatal; 3641da177e4SLinus Torvalds err = icmp_err_convert[code].errno; 3651da177e4SLinus Torvalds } 3661da177e4SLinus Torvalds break; 3671da177e4SLinus Torvalds } 3681da177e4SLinus Torvalds 3691da177e4SLinus Torvalds /* 3701da177e4SLinus Torvalds * RFC1122: OK. Passes ICMP errors back to application, as per 3711da177e4SLinus Torvalds * 4.1.3.3. 3721da177e4SLinus Torvalds */ 3731da177e4SLinus Torvalds if (!inet->recverr) { 3741da177e4SLinus Torvalds if (!harderr || sk->sk_state != TCP_ESTABLISHED) 3751da177e4SLinus Torvalds goto out; 3761da177e4SLinus Torvalds } else { 3771da177e4SLinus Torvalds ip_icmp_error(sk, skb, err, uh->dest, info, (u8*)(uh+1)); 3781da177e4SLinus Torvalds } 3791da177e4SLinus Torvalds sk->sk_err = err; 3801da177e4SLinus Torvalds sk->sk_error_report(sk); 3811da177e4SLinus Torvalds out: 3821da177e4SLinus Torvalds sock_put(sk); 3831da177e4SLinus Torvalds } 3841da177e4SLinus Torvalds 3851da177e4SLinus Torvalds /* 3861da177e4SLinus Torvalds * Throw away all pending data and cancel the corking. Socket is locked. 3871da177e4SLinus Torvalds */ 3881da177e4SLinus Torvalds static void udp_flush_pending_frames(struct sock *sk) 3891da177e4SLinus Torvalds { 3901da177e4SLinus Torvalds struct udp_sock *up = udp_sk(sk); 3911da177e4SLinus Torvalds 3921da177e4SLinus Torvalds if (up->pending) { 3931da177e4SLinus Torvalds up->len = 0; 3941da177e4SLinus Torvalds up->pending = 0; 3951da177e4SLinus Torvalds ip_flush_pending_frames(sk); 3961da177e4SLinus Torvalds } 3971da177e4SLinus Torvalds } 3981da177e4SLinus Torvalds 3991da177e4SLinus Torvalds /* 4001da177e4SLinus Torvalds * Push out all pending data as one UDP datagram. Socket is locked. 4011da177e4SLinus Torvalds */ 4021da177e4SLinus Torvalds static int udp_push_pending_frames(struct sock *sk, struct udp_sock *up) 4031da177e4SLinus Torvalds { 4041da177e4SLinus Torvalds struct inet_sock *inet = inet_sk(sk); 4051da177e4SLinus Torvalds struct flowi *fl = &inet->cork.fl; 4061da177e4SLinus Torvalds struct sk_buff *skb; 4071da177e4SLinus Torvalds struct udphdr *uh; 4081da177e4SLinus Torvalds int err = 0; 4091da177e4SLinus Torvalds 4101da177e4SLinus Torvalds /* Grab the skbuff where UDP header space exists. */ 4111da177e4SLinus Torvalds if ((skb = skb_peek(&sk->sk_write_queue)) == NULL) 4121da177e4SLinus Torvalds goto out; 4131da177e4SLinus Torvalds 4141da177e4SLinus Torvalds /* 4151da177e4SLinus Torvalds * Create a UDP header 4161da177e4SLinus Torvalds */ 4171da177e4SLinus Torvalds uh = skb->h.uh; 4181da177e4SLinus Torvalds uh->source = fl->fl_ip_sport; 4191da177e4SLinus Torvalds uh->dest = fl->fl_ip_dport; 4201da177e4SLinus Torvalds uh->len = htons(up->len); 4211da177e4SLinus Torvalds uh->check = 0; 4221da177e4SLinus Torvalds 4231da177e4SLinus Torvalds if (sk->sk_no_check == UDP_CSUM_NOXMIT) { 4241da177e4SLinus Torvalds skb->ip_summed = CHECKSUM_NONE; 4251da177e4SLinus Torvalds goto send; 4261da177e4SLinus Torvalds } 4271da177e4SLinus Torvalds 4281da177e4SLinus Torvalds if (skb_queue_len(&sk->sk_write_queue) == 1) { 4291da177e4SLinus Torvalds /* 4301da177e4SLinus Torvalds * Only one fragment on the socket. 4311da177e4SLinus Torvalds */ 4321da177e4SLinus Torvalds if (skb->ip_summed == CHECKSUM_HW) { 4331da177e4SLinus Torvalds skb->csum = offsetof(struct udphdr, check); 4341da177e4SLinus Torvalds uh->check = ~csum_tcpudp_magic(fl->fl4_src, fl->fl4_dst, 4351da177e4SLinus Torvalds up->len, IPPROTO_UDP, 0); 4361da177e4SLinus Torvalds } else { 4371da177e4SLinus Torvalds skb->csum = csum_partial((char *)uh, 4381da177e4SLinus Torvalds sizeof(struct udphdr), skb->csum); 4391da177e4SLinus Torvalds uh->check = csum_tcpudp_magic(fl->fl4_src, fl->fl4_dst, 4401da177e4SLinus Torvalds up->len, IPPROTO_UDP, skb->csum); 4411da177e4SLinus Torvalds if (uh->check == 0) 4421da177e4SLinus Torvalds uh->check = -1; 4431da177e4SLinus Torvalds } 4441da177e4SLinus Torvalds } else { 4451da177e4SLinus Torvalds unsigned int csum = 0; 4461da177e4SLinus Torvalds /* 4471da177e4SLinus Torvalds * HW-checksum won't work as there are two or more 4481da177e4SLinus Torvalds * fragments on the socket so that all csums of sk_buffs 4491da177e4SLinus Torvalds * should be together. 4501da177e4SLinus Torvalds */ 4511da177e4SLinus Torvalds if (skb->ip_summed == CHECKSUM_HW) { 4521da177e4SLinus Torvalds int offset = (unsigned char *)uh - skb->data; 4531da177e4SLinus Torvalds skb->csum = skb_checksum(skb, offset, skb->len - offset, 0); 4541da177e4SLinus Torvalds 4551da177e4SLinus Torvalds skb->ip_summed = CHECKSUM_NONE; 4561da177e4SLinus Torvalds } else { 4571da177e4SLinus Torvalds skb->csum = csum_partial((char *)uh, 4581da177e4SLinus Torvalds sizeof(struct udphdr), skb->csum); 4591da177e4SLinus Torvalds } 4601da177e4SLinus Torvalds 4611da177e4SLinus Torvalds skb_queue_walk(&sk->sk_write_queue, skb) { 4621da177e4SLinus Torvalds csum = csum_add(csum, skb->csum); 4631da177e4SLinus Torvalds } 4641da177e4SLinus Torvalds uh->check = csum_tcpudp_magic(fl->fl4_src, fl->fl4_dst, 4651da177e4SLinus Torvalds up->len, IPPROTO_UDP, csum); 4661da177e4SLinus Torvalds if (uh->check == 0) 4671da177e4SLinus Torvalds uh->check = -1; 4681da177e4SLinus Torvalds } 4691da177e4SLinus Torvalds send: 4701da177e4SLinus Torvalds err = ip_push_pending_frames(sk); 4711da177e4SLinus Torvalds out: 4721da177e4SLinus Torvalds up->len = 0; 4731da177e4SLinus Torvalds up->pending = 0; 4741da177e4SLinus Torvalds return err; 4751da177e4SLinus Torvalds } 4761da177e4SLinus Torvalds 4771da177e4SLinus Torvalds 4781da177e4SLinus Torvalds static unsigned short udp_check(struct udphdr *uh, int len, unsigned long saddr, unsigned long daddr, unsigned long base) 4791da177e4SLinus Torvalds { 4801da177e4SLinus Torvalds return(csum_tcpudp_magic(saddr, daddr, len, IPPROTO_UDP, base)); 4811da177e4SLinus Torvalds } 4821da177e4SLinus Torvalds 4831da177e4SLinus Torvalds int udp_sendmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg, 4841da177e4SLinus Torvalds size_t len) 4851da177e4SLinus Torvalds { 4861da177e4SLinus Torvalds struct inet_sock *inet = inet_sk(sk); 4871da177e4SLinus Torvalds struct udp_sock *up = udp_sk(sk); 4881da177e4SLinus Torvalds int ulen = len; 4891da177e4SLinus Torvalds struct ipcm_cookie ipc; 4901da177e4SLinus Torvalds struct rtable *rt = NULL; 4911da177e4SLinus Torvalds int free = 0; 4921da177e4SLinus Torvalds int connected = 0; 4931da177e4SLinus Torvalds u32 daddr, faddr, saddr; 4941da177e4SLinus Torvalds u16 dport; 4951da177e4SLinus Torvalds u8 tos; 4961da177e4SLinus Torvalds int err; 4971da177e4SLinus Torvalds int corkreq = up->corkflag || msg->msg_flags&MSG_MORE; 4981da177e4SLinus Torvalds 4991da177e4SLinus Torvalds if (len > 0xFFFF) 5001da177e4SLinus Torvalds return -EMSGSIZE; 5011da177e4SLinus Torvalds 5021da177e4SLinus Torvalds /* 5031da177e4SLinus Torvalds * Check the flags. 5041da177e4SLinus Torvalds */ 5051da177e4SLinus Torvalds 5061da177e4SLinus Torvalds if (msg->msg_flags&MSG_OOB) /* Mirror BSD error message compatibility */ 5071da177e4SLinus Torvalds return -EOPNOTSUPP; 5081da177e4SLinus Torvalds 5091da177e4SLinus Torvalds ipc.opt = NULL; 5101da177e4SLinus Torvalds 5111da177e4SLinus Torvalds if (up->pending) { 5121da177e4SLinus Torvalds /* 5131da177e4SLinus Torvalds * There are pending frames. 5141da177e4SLinus Torvalds * The socket lock must be held while it's corked. 5151da177e4SLinus Torvalds */ 5161da177e4SLinus Torvalds lock_sock(sk); 5171da177e4SLinus Torvalds if (likely(up->pending)) { 5181da177e4SLinus Torvalds if (unlikely(up->pending != AF_INET)) { 5191da177e4SLinus Torvalds release_sock(sk); 5201da177e4SLinus Torvalds return -EINVAL; 5211da177e4SLinus Torvalds } 5221da177e4SLinus Torvalds goto do_append_data; 5231da177e4SLinus Torvalds } 5241da177e4SLinus Torvalds release_sock(sk); 5251da177e4SLinus Torvalds } 5261da177e4SLinus Torvalds ulen += sizeof(struct udphdr); 5271da177e4SLinus Torvalds 5281da177e4SLinus Torvalds /* 5291da177e4SLinus Torvalds * Get and verify the address. 5301da177e4SLinus Torvalds */ 5311da177e4SLinus Torvalds if (msg->msg_name) { 5321da177e4SLinus Torvalds struct sockaddr_in * usin = (struct sockaddr_in*)msg->msg_name; 5331da177e4SLinus Torvalds if (msg->msg_namelen < sizeof(*usin)) 5341da177e4SLinus Torvalds return -EINVAL; 5351da177e4SLinus Torvalds if (usin->sin_family != AF_INET) { 5361da177e4SLinus Torvalds if (usin->sin_family != AF_UNSPEC) 5371da177e4SLinus Torvalds return -EAFNOSUPPORT; 5381da177e4SLinus Torvalds } 5391da177e4SLinus Torvalds 5401da177e4SLinus Torvalds daddr = usin->sin_addr.s_addr; 5411da177e4SLinus Torvalds dport = usin->sin_port; 5421da177e4SLinus Torvalds if (dport == 0) 5431da177e4SLinus Torvalds return -EINVAL; 5441da177e4SLinus Torvalds } else { 5451da177e4SLinus Torvalds if (sk->sk_state != TCP_ESTABLISHED) 5461da177e4SLinus Torvalds return -EDESTADDRREQ; 5471da177e4SLinus Torvalds daddr = inet->daddr; 5481da177e4SLinus Torvalds dport = inet->dport; 5491da177e4SLinus Torvalds /* Open fast path for connected socket. 5501da177e4SLinus Torvalds Route will not be used, if at least one option is set. 5511da177e4SLinus Torvalds */ 5521da177e4SLinus Torvalds connected = 1; 5531da177e4SLinus Torvalds } 5541da177e4SLinus Torvalds ipc.addr = inet->saddr; 5551da177e4SLinus Torvalds 5561da177e4SLinus Torvalds ipc.oif = sk->sk_bound_dev_if; 5571da177e4SLinus Torvalds if (msg->msg_controllen) { 5581da177e4SLinus Torvalds err = ip_cmsg_send(msg, &ipc); 5591da177e4SLinus Torvalds if (err) 5601da177e4SLinus Torvalds return err; 5611da177e4SLinus Torvalds if (ipc.opt) 5621da177e4SLinus Torvalds free = 1; 5631da177e4SLinus Torvalds connected = 0; 5641da177e4SLinus Torvalds } 5651da177e4SLinus Torvalds if (!ipc.opt) 5661da177e4SLinus Torvalds ipc.opt = inet->opt; 5671da177e4SLinus Torvalds 5681da177e4SLinus Torvalds saddr = ipc.addr; 5691da177e4SLinus Torvalds ipc.addr = faddr = daddr; 5701da177e4SLinus Torvalds 5711da177e4SLinus Torvalds if (ipc.opt && ipc.opt->srr) { 5721da177e4SLinus Torvalds if (!daddr) 5731da177e4SLinus Torvalds return -EINVAL; 5741da177e4SLinus Torvalds faddr = ipc.opt->faddr; 5751da177e4SLinus Torvalds connected = 0; 5761da177e4SLinus Torvalds } 5771da177e4SLinus Torvalds tos = RT_TOS(inet->tos); 5781da177e4SLinus Torvalds if (sock_flag(sk, SOCK_LOCALROUTE) || 5791da177e4SLinus Torvalds (msg->msg_flags & MSG_DONTROUTE) || 5801da177e4SLinus Torvalds (ipc.opt && ipc.opt->is_strictroute)) { 5811da177e4SLinus Torvalds tos |= RTO_ONLINK; 5821da177e4SLinus Torvalds connected = 0; 5831da177e4SLinus Torvalds } 5841da177e4SLinus Torvalds 5851da177e4SLinus Torvalds if (MULTICAST(daddr)) { 5861da177e4SLinus Torvalds if (!ipc.oif) 5871da177e4SLinus Torvalds ipc.oif = inet->mc_index; 5881da177e4SLinus Torvalds if (!saddr) 5891da177e4SLinus Torvalds saddr = inet->mc_addr; 5901da177e4SLinus Torvalds connected = 0; 5911da177e4SLinus Torvalds } 5921da177e4SLinus Torvalds 5931da177e4SLinus Torvalds if (connected) 5941da177e4SLinus Torvalds rt = (struct rtable*)sk_dst_check(sk, 0); 5951da177e4SLinus Torvalds 5961da177e4SLinus Torvalds if (rt == NULL) { 5971da177e4SLinus Torvalds struct flowi fl = { .oif = ipc.oif, 5981da177e4SLinus Torvalds .nl_u = { .ip4_u = 5991da177e4SLinus Torvalds { .daddr = faddr, 6001da177e4SLinus Torvalds .saddr = saddr, 6011da177e4SLinus Torvalds .tos = tos } }, 6021da177e4SLinus Torvalds .proto = IPPROTO_UDP, 6031da177e4SLinus Torvalds .uli_u = { .ports = 6041da177e4SLinus Torvalds { .sport = inet->sport, 6051da177e4SLinus Torvalds .dport = dport } } }; 6061da177e4SLinus Torvalds err = ip_route_output_flow(&rt, &fl, sk, !(msg->msg_flags&MSG_DONTWAIT)); 6071da177e4SLinus Torvalds if (err) 6081da177e4SLinus Torvalds goto out; 6091da177e4SLinus Torvalds 6101da177e4SLinus Torvalds err = -EACCES; 6111da177e4SLinus Torvalds if ((rt->rt_flags & RTCF_BROADCAST) && 6121da177e4SLinus Torvalds !sock_flag(sk, SOCK_BROADCAST)) 6131da177e4SLinus Torvalds goto out; 6141da177e4SLinus Torvalds if (connected) 6151da177e4SLinus Torvalds sk_dst_set(sk, dst_clone(&rt->u.dst)); 6161da177e4SLinus Torvalds } 6171da177e4SLinus Torvalds 6181da177e4SLinus Torvalds if (msg->msg_flags&MSG_CONFIRM) 6191da177e4SLinus Torvalds goto do_confirm; 6201da177e4SLinus Torvalds back_from_confirm: 6211da177e4SLinus Torvalds 6221da177e4SLinus Torvalds saddr = rt->rt_src; 6231da177e4SLinus Torvalds if (!ipc.addr) 6241da177e4SLinus Torvalds daddr = ipc.addr = rt->rt_dst; 6251da177e4SLinus Torvalds 6261da177e4SLinus Torvalds lock_sock(sk); 6271da177e4SLinus Torvalds if (unlikely(up->pending)) { 6281da177e4SLinus Torvalds /* The socket is already corked while preparing it. */ 6291da177e4SLinus Torvalds /* ... which is an evident application bug. --ANK */ 6301da177e4SLinus Torvalds release_sock(sk); 6311da177e4SLinus Torvalds 63264ce2073SPatrick McHardy LIMIT_NETDEBUG(KERN_DEBUG "udp cork app bug 2\n"); 6331da177e4SLinus Torvalds err = -EINVAL; 6341da177e4SLinus Torvalds goto out; 6351da177e4SLinus Torvalds } 6361da177e4SLinus Torvalds /* 6371da177e4SLinus Torvalds * Now cork the socket to pend data. 6381da177e4SLinus Torvalds */ 6391da177e4SLinus Torvalds inet->cork.fl.fl4_dst = daddr; 6401da177e4SLinus Torvalds inet->cork.fl.fl_ip_dport = dport; 6411da177e4SLinus Torvalds inet->cork.fl.fl4_src = saddr; 6421da177e4SLinus Torvalds inet->cork.fl.fl_ip_sport = inet->sport; 6431da177e4SLinus Torvalds up->pending = AF_INET; 6441da177e4SLinus Torvalds 6451da177e4SLinus Torvalds do_append_data: 6461da177e4SLinus Torvalds up->len += ulen; 6471da177e4SLinus Torvalds err = ip_append_data(sk, ip_generic_getfrag, msg->msg_iov, ulen, 6481da177e4SLinus Torvalds sizeof(struct udphdr), &ipc, rt, 6491da177e4SLinus Torvalds corkreq ? msg->msg_flags|MSG_MORE : msg->msg_flags); 6501da177e4SLinus Torvalds if (err) 6511da177e4SLinus Torvalds udp_flush_pending_frames(sk); 6521da177e4SLinus Torvalds else if (!corkreq) 6531da177e4SLinus Torvalds err = udp_push_pending_frames(sk, up); 6541da177e4SLinus Torvalds release_sock(sk); 6551da177e4SLinus Torvalds 6561da177e4SLinus Torvalds out: 6571da177e4SLinus Torvalds ip_rt_put(rt); 6581da177e4SLinus Torvalds if (free) 6591da177e4SLinus Torvalds kfree(ipc.opt); 6601da177e4SLinus Torvalds if (!err) { 6611da177e4SLinus Torvalds UDP_INC_STATS_USER(UDP_MIB_OUTDATAGRAMS); 6621da177e4SLinus Torvalds return len; 6631da177e4SLinus Torvalds } 6641da177e4SLinus Torvalds return err; 6651da177e4SLinus Torvalds 6661da177e4SLinus Torvalds do_confirm: 6671da177e4SLinus Torvalds dst_confirm(&rt->u.dst); 6681da177e4SLinus Torvalds if (!(msg->msg_flags&MSG_PROBE) || len) 6691da177e4SLinus Torvalds goto back_from_confirm; 6701da177e4SLinus Torvalds err = 0; 6711da177e4SLinus Torvalds goto out; 6721da177e4SLinus Torvalds } 6731da177e4SLinus Torvalds 6741da177e4SLinus Torvalds static int udp_sendpage(struct sock *sk, struct page *page, int offset, 6751da177e4SLinus Torvalds size_t size, int flags) 6761da177e4SLinus Torvalds { 6771da177e4SLinus Torvalds struct udp_sock *up = udp_sk(sk); 6781da177e4SLinus Torvalds int ret; 6791da177e4SLinus Torvalds 6801da177e4SLinus Torvalds if (!up->pending) { 6811da177e4SLinus Torvalds struct msghdr msg = { .msg_flags = flags|MSG_MORE }; 6821da177e4SLinus Torvalds 6831da177e4SLinus Torvalds /* Call udp_sendmsg to specify destination address which 6841da177e4SLinus Torvalds * sendpage interface can't pass. 6851da177e4SLinus Torvalds * This will succeed only when the socket is connected. 6861da177e4SLinus Torvalds */ 6871da177e4SLinus Torvalds ret = udp_sendmsg(NULL, sk, &msg, 0); 6881da177e4SLinus Torvalds if (ret < 0) 6891da177e4SLinus Torvalds return ret; 6901da177e4SLinus Torvalds } 6911da177e4SLinus Torvalds 6921da177e4SLinus Torvalds lock_sock(sk); 6931da177e4SLinus Torvalds 6941da177e4SLinus Torvalds if (unlikely(!up->pending)) { 6951da177e4SLinus Torvalds release_sock(sk); 6961da177e4SLinus Torvalds 69764ce2073SPatrick McHardy LIMIT_NETDEBUG(KERN_DEBUG "udp cork app bug 3\n"); 6981da177e4SLinus Torvalds return -EINVAL; 6991da177e4SLinus Torvalds } 7001da177e4SLinus Torvalds 7011da177e4SLinus Torvalds ret = ip_append_page(sk, page, offset, size, flags); 7021da177e4SLinus Torvalds if (ret == -EOPNOTSUPP) { 7031da177e4SLinus Torvalds release_sock(sk); 7041da177e4SLinus Torvalds return sock_no_sendpage(sk->sk_socket, page, offset, 7051da177e4SLinus Torvalds size, flags); 7061da177e4SLinus Torvalds } 7071da177e4SLinus Torvalds if (ret < 0) { 7081da177e4SLinus Torvalds udp_flush_pending_frames(sk); 7091da177e4SLinus Torvalds goto out; 7101da177e4SLinus Torvalds } 7111da177e4SLinus Torvalds 7121da177e4SLinus Torvalds up->len += size; 7131da177e4SLinus Torvalds if (!(up->corkflag || (flags&MSG_MORE))) 7141da177e4SLinus Torvalds ret = udp_push_pending_frames(sk, up); 7151da177e4SLinus Torvalds if (!ret) 7161da177e4SLinus Torvalds ret = size; 7171da177e4SLinus Torvalds out: 7181da177e4SLinus Torvalds release_sock(sk); 7191da177e4SLinus Torvalds return ret; 7201da177e4SLinus Torvalds } 7211da177e4SLinus Torvalds 7221da177e4SLinus Torvalds /* 7231da177e4SLinus Torvalds * IOCTL requests applicable to the UDP protocol 7241da177e4SLinus Torvalds */ 7251da177e4SLinus Torvalds 7261da177e4SLinus Torvalds int udp_ioctl(struct sock *sk, int cmd, unsigned long arg) 7271da177e4SLinus Torvalds { 7281da177e4SLinus Torvalds switch(cmd) 7291da177e4SLinus Torvalds { 7301da177e4SLinus Torvalds case SIOCOUTQ: 7311da177e4SLinus Torvalds { 7321da177e4SLinus Torvalds int amount = atomic_read(&sk->sk_wmem_alloc); 7331da177e4SLinus Torvalds return put_user(amount, (int __user *)arg); 7341da177e4SLinus Torvalds } 7351da177e4SLinus Torvalds 7361da177e4SLinus Torvalds case SIOCINQ: 7371da177e4SLinus Torvalds { 7381da177e4SLinus Torvalds struct sk_buff *skb; 7391da177e4SLinus Torvalds unsigned long amount; 7401da177e4SLinus Torvalds 7411da177e4SLinus Torvalds amount = 0; 742208d8984SHerbert Xu spin_lock_bh(&sk->sk_receive_queue.lock); 7431da177e4SLinus Torvalds skb = skb_peek(&sk->sk_receive_queue); 7441da177e4SLinus Torvalds if (skb != NULL) { 7451da177e4SLinus Torvalds /* 7461da177e4SLinus Torvalds * We will only return the amount 7471da177e4SLinus Torvalds * of this packet since that is all 7481da177e4SLinus Torvalds * that will be read. 7491da177e4SLinus Torvalds */ 7501da177e4SLinus Torvalds amount = skb->len - sizeof(struct udphdr); 7511da177e4SLinus Torvalds } 752208d8984SHerbert Xu spin_unlock_bh(&sk->sk_receive_queue.lock); 7531da177e4SLinus Torvalds return put_user(amount, (int __user *)arg); 7541da177e4SLinus Torvalds } 7551da177e4SLinus Torvalds 7561da177e4SLinus Torvalds default: 7571da177e4SLinus Torvalds return -ENOIOCTLCMD; 7581da177e4SLinus Torvalds } 7591da177e4SLinus Torvalds return(0); 7601da177e4SLinus Torvalds } 7611da177e4SLinus Torvalds 7621da177e4SLinus Torvalds static __inline__ int __udp_checksum_complete(struct sk_buff *skb) 7631da177e4SLinus Torvalds { 764fb286bb2SHerbert Xu return __skb_checksum_complete(skb); 7651da177e4SLinus Torvalds } 7661da177e4SLinus Torvalds 7671da177e4SLinus Torvalds static __inline__ int udp_checksum_complete(struct sk_buff *skb) 7681da177e4SLinus Torvalds { 7691da177e4SLinus Torvalds return skb->ip_summed != CHECKSUM_UNNECESSARY && 7701da177e4SLinus Torvalds __udp_checksum_complete(skb); 7711da177e4SLinus Torvalds } 7721da177e4SLinus Torvalds 7731da177e4SLinus Torvalds /* 7741da177e4SLinus Torvalds * This should be easy, if there is something there we 7751da177e4SLinus Torvalds * return it, otherwise we block. 7761da177e4SLinus Torvalds */ 7771da177e4SLinus Torvalds 7781da177e4SLinus Torvalds static int udp_recvmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg, 7791da177e4SLinus Torvalds size_t len, int noblock, int flags, int *addr_len) 7801da177e4SLinus Torvalds { 7811da177e4SLinus Torvalds struct inet_sock *inet = inet_sk(sk); 7821da177e4SLinus Torvalds struct sockaddr_in *sin = (struct sockaddr_in *)msg->msg_name; 7831da177e4SLinus Torvalds struct sk_buff *skb; 7841da177e4SLinus Torvalds int copied, err; 7851da177e4SLinus Torvalds 7861da177e4SLinus Torvalds /* 7871da177e4SLinus Torvalds * Check any passed addresses 7881da177e4SLinus Torvalds */ 7891da177e4SLinus Torvalds if (addr_len) 7901da177e4SLinus Torvalds *addr_len=sizeof(*sin); 7911da177e4SLinus Torvalds 7921da177e4SLinus Torvalds if (flags & MSG_ERRQUEUE) 7931da177e4SLinus Torvalds return ip_recv_error(sk, msg, len); 7941da177e4SLinus Torvalds 7951da177e4SLinus Torvalds try_again: 7961da177e4SLinus Torvalds skb = skb_recv_datagram(sk, flags, noblock, &err); 7971da177e4SLinus Torvalds if (!skb) 7981da177e4SLinus Torvalds goto out; 7991da177e4SLinus Torvalds 8001da177e4SLinus Torvalds copied = skb->len - sizeof(struct udphdr); 8011da177e4SLinus Torvalds if (copied > len) { 8021da177e4SLinus Torvalds copied = len; 8031da177e4SLinus Torvalds msg->msg_flags |= MSG_TRUNC; 8041da177e4SLinus Torvalds } 8051da177e4SLinus Torvalds 8061da177e4SLinus Torvalds if (skb->ip_summed==CHECKSUM_UNNECESSARY) { 8071da177e4SLinus Torvalds err = skb_copy_datagram_iovec(skb, sizeof(struct udphdr), msg->msg_iov, 8081da177e4SLinus Torvalds copied); 8091da177e4SLinus Torvalds } else if (msg->msg_flags&MSG_TRUNC) { 8101da177e4SLinus Torvalds if (__udp_checksum_complete(skb)) 8111da177e4SLinus Torvalds goto csum_copy_err; 8121da177e4SLinus Torvalds err = skb_copy_datagram_iovec(skb, sizeof(struct udphdr), msg->msg_iov, 8131da177e4SLinus Torvalds copied); 8141da177e4SLinus Torvalds } else { 8151da177e4SLinus Torvalds err = skb_copy_and_csum_datagram_iovec(skb, sizeof(struct udphdr), msg->msg_iov); 8161da177e4SLinus Torvalds 8171da177e4SLinus Torvalds if (err == -EINVAL) 8181da177e4SLinus Torvalds goto csum_copy_err; 8191da177e4SLinus Torvalds } 8201da177e4SLinus Torvalds 8211da177e4SLinus Torvalds if (err) 8221da177e4SLinus Torvalds goto out_free; 8231da177e4SLinus Torvalds 8241da177e4SLinus Torvalds sock_recv_timestamp(msg, sk, skb); 8251da177e4SLinus Torvalds 8261da177e4SLinus Torvalds /* Copy the address. */ 8271da177e4SLinus Torvalds if (sin) 8281da177e4SLinus Torvalds { 8291da177e4SLinus Torvalds sin->sin_family = AF_INET; 8301da177e4SLinus Torvalds sin->sin_port = skb->h.uh->source; 8311da177e4SLinus Torvalds sin->sin_addr.s_addr = skb->nh.iph->saddr; 8321da177e4SLinus Torvalds memset(sin->sin_zero, 0, sizeof(sin->sin_zero)); 8331da177e4SLinus Torvalds } 8341da177e4SLinus Torvalds if (inet->cmsg_flags) 8351da177e4SLinus Torvalds ip_cmsg_recv(msg, skb); 8361da177e4SLinus Torvalds 8371da177e4SLinus Torvalds err = copied; 8381da177e4SLinus Torvalds if (flags & MSG_TRUNC) 8391da177e4SLinus Torvalds err = skb->len - sizeof(struct udphdr); 8401da177e4SLinus Torvalds 8411da177e4SLinus Torvalds out_free: 8421da177e4SLinus Torvalds skb_free_datagram(sk, skb); 8431da177e4SLinus Torvalds out: 8441da177e4SLinus Torvalds return err; 8451da177e4SLinus Torvalds 8461da177e4SLinus Torvalds csum_copy_err: 8471da177e4SLinus Torvalds UDP_INC_STATS_BH(UDP_MIB_INERRORS); 8481da177e4SLinus Torvalds 849*3305b80cSHerbert Xu skb_kill_datagram(sk, skb, flags); 8501da177e4SLinus Torvalds 8511da177e4SLinus Torvalds if (noblock) 8521da177e4SLinus Torvalds return -EAGAIN; 8531da177e4SLinus Torvalds goto try_again; 8541da177e4SLinus Torvalds } 8551da177e4SLinus Torvalds 8561da177e4SLinus Torvalds 8571da177e4SLinus Torvalds int udp_disconnect(struct sock *sk, int flags) 8581da177e4SLinus Torvalds { 8591da177e4SLinus Torvalds struct inet_sock *inet = inet_sk(sk); 8601da177e4SLinus Torvalds /* 8611da177e4SLinus Torvalds * 1003.1g - break association. 8621da177e4SLinus Torvalds */ 8631da177e4SLinus Torvalds 8641da177e4SLinus Torvalds sk->sk_state = TCP_CLOSE; 8651da177e4SLinus Torvalds inet->daddr = 0; 8661da177e4SLinus Torvalds inet->dport = 0; 8671da177e4SLinus Torvalds sk->sk_bound_dev_if = 0; 8681da177e4SLinus Torvalds if (!(sk->sk_userlocks & SOCK_BINDADDR_LOCK)) 8691da177e4SLinus Torvalds inet_reset_saddr(sk); 8701da177e4SLinus Torvalds 8711da177e4SLinus Torvalds if (!(sk->sk_userlocks & SOCK_BINDPORT_LOCK)) { 8721da177e4SLinus Torvalds sk->sk_prot->unhash(sk); 8731da177e4SLinus Torvalds inet->sport = 0; 8741da177e4SLinus Torvalds } 8751da177e4SLinus Torvalds sk_dst_reset(sk); 8761da177e4SLinus Torvalds return 0; 8771da177e4SLinus Torvalds } 8781da177e4SLinus Torvalds 8791da177e4SLinus Torvalds static void udp_close(struct sock *sk, long timeout) 8801da177e4SLinus Torvalds { 8811da177e4SLinus Torvalds sk_common_release(sk); 8821da177e4SLinus Torvalds } 8831da177e4SLinus Torvalds 8841da177e4SLinus Torvalds /* return: 8851da177e4SLinus Torvalds * 1 if the the UDP system should process it 8861da177e4SLinus Torvalds * 0 if we should drop this packet 8871da177e4SLinus Torvalds * -1 if it should get processed by xfrm4_rcv_encap 8881da177e4SLinus Torvalds */ 8891da177e4SLinus Torvalds static int udp_encap_rcv(struct sock * sk, struct sk_buff *skb) 8901da177e4SLinus Torvalds { 8911da177e4SLinus Torvalds #ifndef CONFIG_XFRM 8921da177e4SLinus Torvalds return 1; 8931da177e4SLinus Torvalds #else 8941da177e4SLinus Torvalds struct udp_sock *up = udp_sk(sk); 8951da177e4SLinus Torvalds struct udphdr *uh = skb->h.uh; 8961da177e4SLinus Torvalds struct iphdr *iph; 8971da177e4SLinus Torvalds int iphlen, len; 8981da177e4SLinus Torvalds 8991da177e4SLinus Torvalds __u8 *udpdata = (__u8 *)uh + sizeof(struct udphdr); 9001da177e4SLinus Torvalds __u32 *udpdata32 = (__u32 *)udpdata; 9011da177e4SLinus Torvalds __u16 encap_type = up->encap_type; 9021da177e4SLinus Torvalds 9031da177e4SLinus Torvalds /* if we're overly short, let UDP handle it */ 9041da177e4SLinus Torvalds if (udpdata > skb->tail) 9051da177e4SLinus Torvalds return 1; 9061da177e4SLinus Torvalds 9071da177e4SLinus Torvalds /* if this is not encapsulated socket, then just return now */ 9081da177e4SLinus Torvalds if (!encap_type) 9091da177e4SLinus Torvalds return 1; 9101da177e4SLinus Torvalds 9111da177e4SLinus Torvalds len = skb->tail - udpdata; 9121da177e4SLinus Torvalds 9131da177e4SLinus Torvalds switch (encap_type) { 9141da177e4SLinus Torvalds default: 9151da177e4SLinus Torvalds case UDP_ENCAP_ESPINUDP: 9161da177e4SLinus Torvalds /* Check if this is a keepalive packet. If so, eat it. */ 9171da177e4SLinus Torvalds if (len == 1 && udpdata[0] == 0xff) { 9181da177e4SLinus Torvalds return 0; 9191da177e4SLinus Torvalds } else if (len > sizeof(struct ip_esp_hdr) && udpdata32[0] != 0 ) { 9201da177e4SLinus Torvalds /* ESP Packet without Non-ESP header */ 9211da177e4SLinus Torvalds len = sizeof(struct udphdr); 9221da177e4SLinus Torvalds } else 9231da177e4SLinus Torvalds /* Must be an IKE packet.. pass it through */ 9241da177e4SLinus Torvalds return 1; 9251da177e4SLinus Torvalds break; 9261da177e4SLinus Torvalds case UDP_ENCAP_ESPINUDP_NON_IKE: 9271da177e4SLinus Torvalds /* Check if this is a keepalive packet. If so, eat it. */ 9281da177e4SLinus Torvalds if (len == 1 && udpdata[0] == 0xff) { 9291da177e4SLinus Torvalds return 0; 9301da177e4SLinus Torvalds } else if (len > 2 * sizeof(u32) + sizeof(struct ip_esp_hdr) && 9311da177e4SLinus Torvalds udpdata32[0] == 0 && udpdata32[1] == 0) { 9321da177e4SLinus Torvalds 9331da177e4SLinus Torvalds /* ESP Packet with Non-IKE marker */ 9341da177e4SLinus Torvalds len = sizeof(struct udphdr) + 2 * sizeof(u32); 9351da177e4SLinus Torvalds } else 9361da177e4SLinus Torvalds /* Must be an IKE packet.. pass it through */ 9371da177e4SLinus Torvalds return 1; 9381da177e4SLinus Torvalds break; 9391da177e4SLinus Torvalds } 9401da177e4SLinus Torvalds 9411da177e4SLinus Torvalds /* At this point we are sure that this is an ESPinUDP packet, 9421da177e4SLinus Torvalds * so we need to remove 'len' bytes from the packet (the UDP 9431da177e4SLinus Torvalds * header and optional ESP marker bytes) and then modify the 9441da177e4SLinus Torvalds * protocol to ESP, and then call into the transform receiver. 9451da177e4SLinus Torvalds */ 9464d78b6c7SHerbert Xu if (skb_cloned(skb) && pskb_expand_head(skb, 0, 0, GFP_ATOMIC)) 9474d78b6c7SHerbert Xu return 0; 9481da177e4SLinus Torvalds 9491da177e4SLinus Torvalds /* Now we can update and verify the packet length... */ 9501da177e4SLinus Torvalds iph = skb->nh.iph; 9511da177e4SLinus Torvalds iphlen = iph->ihl << 2; 9521da177e4SLinus Torvalds iph->tot_len = htons(ntohs(iph->tot_len) - len); 9531da177e4SLinus Torvalds if (skb->len < iphlen + len) { 9541da177e4SLinus Torvalds /* packet is too small!?! */ 9551da177e4SLinus Torvalds return 0; 9561da177e4SLinus Torvalds } 9571da177e4SLinus Torvalds 9581da177e4SLinus Torvalds /* pull the data buffer up to the ESP header and set the 9591da177e4SLinus Torvalds * transport header to point to ESP. Keep UDP on the stack 9601da177e4SLinus Torvalds * for later. 9611da177e4SLinus Torvalds */ 9621da177e4SLinus Torvalds skb->h.raw = skb_pull(skb, len); 9631da177e4SLinus Torvalds 9641da177e4SLinus Torvalds /* modify the protocol (it's ESP!) */ 9651da177e4SLinus Torvalds iph->protocol = IPPROTO_ESP; 9661da177e4SLinus Torvalds 9671da177e4SLinus Torvalds /* and let the caller know to send this into the ESP processor... */ 9681da177e4SLinus Torvalds return -1; 9691da177e4SLinus Torvalds #endif 9701da177e4SLinus Torvalds } 9711da177e4SLinus Torvalds 9721da177e4SLinus Torvalds /* returns: 9731da177e4SLinus Torvalds * -1: error 9741da177e4SLinus Torvalds * 0: success 9751da177e4SLinus Torvalds * >0: "udp encap" protocol resubmission 9761da177e4SLinus Torvalds * 9771da177e4SLinus Torvalds * Note that in the success and error cases, the skb is assumed to 9781da177e4SLinus Torvalds * have either been requeued or freed. 9791da177e4SLinus Torvalds */ 9801da177e4SLinus Torvalds static int udp_queue_rcv_skb(struct sock * sk, struct sk_buff *skb) 9811da177e4SLinus Torvalds { 9821da177e4SLinus Torvalds struct udp_sock *up = udp_sk(sk); 9831da177e4SLinus Torvalds 9841da177e4SLinus Torvalds /* 9851da177e4SLinus Torvalds * Charge it to the socket, dropping if the queue is full. 9861da177e4SLinus Torvalds */ 9871da177e4SLinus Torvalds if (!xfrm4_policy_check(sk, XFRM_POLICY_IN, skb)) { 9881da177e4SLinus Torvalds kfree_skb(skb); 9891da177e4SLinus Torvalds return -1; 9901da177e4SLinus Torvalds } 9911da177e4SLinus Torvalds 9921da177e4SLinus Torvalds if (up->encap_type) { 9931da177e4SLinus Torvalds /* 9941da177e4SLinus Torvalds * This is an encapsulation socket, so let's see if this is 9951da177e4SLinus Torvalds * an encapsulated packet. 9961da177e4SLinus Torvalds * If it's a keepalive packet, then just eat it. 9971da177e4SLinus Torvalds * If it's an encapsulateed packet, then pass it to the 9981da177e4SLinus Torvalds * IPsec xfrm input and return the response 9991da177e4SLinus Torvalds * appropriately. Otherwise, just fall through and 10001da177e4SLinus Torvalds * pass this up the UDP socket. 10011da177e4SLinus Torvalds */ 10021da177e4SLinus Torvalds int ret; 10031da177e4SLinus Torvalds 10041da177e4SLinus Torvalds ret = udp_encap_rcv(sk, skb); 10051da177e4SLinus Torvalds if (ret == 0) { 10061da177e4SLinus Torvalds /* Eat the packet .. */ 10071da177e4SLinus Torvalds kfree_skb(skb); 10081da177e4SLinus Torvalds return 0; 10091da177e4SLinus Torvalds } 10101da177e4SLinus Torvalds if (ret < 0) { 10111da177e4SLinus Torvalds /* process the ESP packet */ 10121da177e4SLinus Torvalds ret = xfrm4_rcv_encap(skb, up->encap_type); 10131da177e4SLinus Torvalds UDP_INC_STATS_BH(UDP_MIB_INDATAGRAMS); 10141da177e4SLinus Torvalds return -ret; 10151da177e4SLinus Torvalds } 10161da177e4SLinus Torvalds /* FALLTHROUGH -- it's a UDP Packet */ 10171da177e4SLinus Torvalds } 10181da177e4SLinus Torvalds 10191da177e4SLinus Torvalds if (sk->sk_filter && skb->ip_summed != CHECKSUM_UNNECESSARY) { 10201da177e4SLinus Torvalds if (__udp_checksum_complete(skb)) { 10211da177e4SLinus Torvalds UDP_INC_STATS_BH(UDP_MIB_INERRORS); 10221da177e4SLinus Torvalds kfree_skb(skb); 10231da177e4SLinus Torvalds return -1; 10241da177e4SLinus Torvalds } 10251da177e4SLinus Torvalds skb->ip_summed = CHECKSUM_UNNECESSARY; 10261da177e4SLinus Torvalds } 10271da177e4SLinus Torvalds 10281da177e4SLinus Torvalds if (sock_queue_rcv_skb(sk,skb)<0) { 10291da177e4SLinus Torvalds UDP_INC_STATS_BH(UDP_MIB_INERRORS); 10301da177e4SLinus Torvalds kfree_skb(skb); 10311da177e4SLinus Torvalds return -1; 10321da177e4SLinus Torvalds } 10331da177e4SLinus Torvalds UDP_INC_STATS_BH(UDP_MIB_INDATAGRAMS); 10341da177e4SLinus Torvalds return 0; 10351da177e4SLinus Torvalds } 10361da177e4SLinus Torvalds 10371da177e4SLinus Torvalds /* 10381da177e4SLinus Torvalds * Multicasts and broadcasts go to each listener. 10391da177e4SLinus Torvalds * 10401da177e4SLinus Torvalds * Note: called only from the BH handler context, 10411da177e4SLinus Torvalds * so we don't need to lock the hashes. 10421da177e4SLinus Torvalds */ 10431da177e4SLinus Torvalds static int udp_v4_mcast_deliver(struct sk_buff *skb, struct udphdr *uh, 10441da177e4SLinus Torvalds u32 saddr, u32 daddr) 10451da177e4SLinus Torvalds { 10461da177e4SLinus Torvalds struct sock *sk; 10471da177e4SLinus Torvalds int dif; 10481da177e4SLinus Torvalds 10491da177e4SLinus Torvalds read_lock(&udp_hash_lock); 10501da177e4SLinus Torvalds sk = sk_head(&udp_hash[ntohs(uh->dest) & (UDP_HTABLE_SIZE - 1)]); 10511da177e4SLinus Torvalds dif = skb->dev->ifindex; 10521da177e4SLinus Torvalds sk = udp_v4_mcast_next(sk, uh->dest, daddr, uh->source, saddr, dif); 10531da177e4SLinus Torvalds if (sk) { 10541da177e4SLinus Torvalds struct sock *sknext = NULL; 10551da177e4SLinus Torvalds 10561da177e4SLinus Torvalds do { 10571da177e4SLinus Torvalds struct sk_buff *skb1 = skb; 10581da177e4SLinus Torvalds 10591da177e4SLinus Torvalds sknext = udp_v4_mcast_next(sk_next(sk), uh->dest, daddr, 10601da177e4SLinus Torvalds uh->source, saddr, dif); 10611da177e4SLinus Torvalds if(sknext) 10621da177e4SLinus Torvalds skb1 = skb_clone(skb, GFP_ATOMIC); 10631da177e4SLinus Torvalds 10641da177e4SLinus Torvalds if(skb1) { 10651da177e4SLinus Torvalds int ret = udp_queue_rcv_skb(sk, skb1); 10661da177e4SLinus Torvalds if (ret > 0) 10671da177e4SLinus Torvalds /* we should probably re-process instead 10681da177e4SLinus Torvalds * of dropping packets here. */ 10691da177e4SLinus Torvalds kfree_skb(skb1); 10701da177e4SLinus Torvalds } 10711da177e4SLinus Torvalds sk = sknext; 10721da177e4SLinus Torvalds } while(sknext); 10731da177e4SLinus Torvalds } else 10741da177e4SLinus Torvalds kfree_skb(skb); 10751da177e4SLinus Torvalds read_unlock(&udp_hash_lock); 10761da177e4SLinus Torvalds return 0; 10771da177e4SLinus Torvalds } 10781da177e4SLinus Torvalds 10791da177e4SLinus Torvalds /* Initialize UDP checksum. If exited with zero value (success), 10801da177e4SLinus Torvalds * CHECKSUM_UNNECESSARY means, that no more checks are required. 10811da177e4SLinus Torvalds * Otherwise, csum completion requires chacksumming packet body, 10821da177e4SLinus Torvalds * including udp header and folding it to skb->csum. 10831da177e4SLinus Torvalds */ 10841da177e4SLinus Torvalds static int udp_checksum_init(struct sk_buff *skb, struct udphdr *uh, 10851da177e4SLinus Torvalds unsigned short ulen, u32 saddr, u32 daddr) 10861da177e4SLinus Torvalds { 10871da177e4SLinus Torvalds if (uh->check == 0) { 10881da177e4SLinus Torvalds skb->ip_summed = CHECKSUM_UNNECESSARY; 10891da177e4SLinus Torvalds } else if (skb->ip_summed == CHECKSUM_HW) { 10901da177e4SLinus Torvalds if (!udp_check(uh, ulen, saddr, daddr, skb->csum)) 1091fb286bb2SHerbert Xu skb->ip_summed = CHECKSUM_UNNECESSARY; 10921da177e4SLinus Torvalds } 10931da177e4SLinus Torvalds if (skb->ip_summed != CHECKSUM_UNNECESSARY) 10941da177e4SLinus Torvalds skb->csum = csum_tcpudp_nofold(saddr, daddr, ulen, IPPROTO_UDP, 0); 10951da177e4SLinus Torvalds /* Probably, we should checksum udp header (it should be in cache 10961da177e4SLinus Torvalds * in any case) and data in tiny packets (< rx copybreak). 10971da177e4SLinus Torvalds */ 10981da177e4SLinus Torvalds return 0; 10991da177e4SLinus Torvalds } 11001da177e4SLinus Torvalds 11011da177e4SLinus Torvalds /* 11021da177e4SLinus Torvalds * All we need to do is get the socket, and then do a checksum. 11031da177e4SLinus Torvalds */ 11041da177e4SLinus Torvalds 11051da177e4SLinus Torvalds int udp_rcv(struct sk_buff *skb) 11061da177e4SLinus Torvalds { 11071da177e4SLinus Torvalds struct sock *sk; 11081da177e4SLinus Torvalds struct udphdr *uh; 11091da177e4SLinus Torvalds unsigned short ulen; 11101da177e4SLinus Torvalds struct rtable *rt = (struct rtable*)skb->dst; 11111da177e4SLinus Torvalds u32 saddr = skb->nh.iph->saddr; 11121da177e4SLinus Torvalds u32 daddr = skb->nh.iph->daddr; 11131da177e4SLinus Torvalds int len = skb->len; 11141da177e4SLinus Torvalds 11151da177e4SLinus Torvalds /* 11161da177e4SLinus Torvalds * Validate the packet and the UDP length. 11171da177e4SLinus Torvalds */ 11181da177e4SLinus Torvalds if (!pskb_may_pull(skb, sizeof(struct udphdr))) 11191da177e4SLinus Torvalds goto no_header; 11201da177e4SLinus Torvalds 11211da177e4SLinus Torvalds uh = skb->h.uh; 11221da177e4SLinus Torvalds 11231da177e4SLinus Torvalds ulen = ntohs(uh->len); 11241da177e4SLinus Torvalds 11251da177e4SLinus Torvalds if (ulen > len || ulen < sizeof(*uh)) 11261da177e4SLinus Torvalds goto short_packet; 11271da177e4SLinus Torvalds 1128e308e25cSStephen Hemminger if (pskb_trim_rcsum(skb, ulen)) 11291da177e4SLinus Torvalds goto short_packet; 11301da177e4SLinus Torvalds 11311da177e4SLinus Torvalds if (udp_checksum_init(skb, uh, ulen, saddr, daddr) < 0) 11321da177e4SLinus Torvalds goto csum_error; 11331da177e4SLinus Torvalds 11341da177e4SLinus Torvalds if(rt->rt_flags & (RTCF_BROADCAST|RTCF_MULTICAST)) 11351da177e4SLinus Torvalds return udp_v4_mcast_deliver(skb, uh, saddr, daddr); 11361da177e4SLinus Torvalds 11371da177e4SLinus Torvalds sk = udp_v4_lookup(saddr, uh->source, daddr, uh->dest, skb->dev->ifindex); 11381da177e4SLinus Torvalds 11391da177e4SLinus Torvalds if (sk != NULL) { 11401da177e4SLinus Torvalds int ret = udp_queue_rcv_skb(sk, skb); 11411da177e4SLinus Torvalds sock_put(sk); 11421da177e4SLinus Torvalds 11431da177e4SLinus Torvalds /* a return value > 0 means to resubmit the input, but 11441da177e4SLinus Torvalds * it it wants the return to be -protocol, or 0 11451da177e4SLinus Torvalds */ 11461da177e4SLinus Torvalds if (ret > 0) 11471da177e4SLinus Torvalds return -ret; 11481da177e4SLinus Torvalds return 0; 11491da177e4SLinus Torvalds } 11501da177e4SLinus Torvalds 11511da177e4SLinus Torvalds if (!xfrm4_policy_check(NULL, XFRM_POLICY_IN, skb)) 11521da177e4SLinus Torvalds goto drop; 11531da177e4SLinus Torvalds 11541da177e4SLinus Torvalds /* No socket. Drop packet silently, if checksum is wrong */ 11551da177e4SLinus Torvalds if (udp_checksum_complete(skb)) 11561da177e4SLinus Torvalds goto csum_error; 11571da177e4SLinus Torvalds 11581da177e4SLinus Torvalds UDP_INC_STATS_BH(UDP_MIB_NOPORTS); 11591da177e4SLinus Torvalds icmp_send(skb, ICMP_DEST_UNREACH, ICMP_PORT_UNREACH, 0); 11601da177e4SLinus Torvalds 11611da177e4SLinus Torvalds /* 11621da177e4SLinus Torvalds * Hmm. We got an UDP packet to a port to which we 11631da177e4SLinus Torvalds * don't wanna listen. Ignore it. 11641da177e4SLinus Torvalds */ 11651da177e4SLinus Torvalds kfree_skb(skb); 11661da177e4SLinus Torvalds return(0); 11671da177e4SLinus Torvalds 11681da177e4SLinus Torvalds short_packet: 116964ce2073SPatrick McHardy LIMIT_NETDEBUG(KERN_DEBUG "UDP: short packet: From %u.%u.%u.%u:%u %d/%d to %u.%u.%u.%u:%u\n", 11701da177e4SLinus Torvalds NIPQUAD(saddr), 11711da177e4SLinus Torvalds ntohs(uh->source), 11721da177e4SLinus Torvalds ulen, 11731da177e4SLinus Torvalds len, 11741da177e4SLinus Torvalds NIPQUAD(daddr), 117564ce2073SPatrick McHardy ntohs(uh->dest)); 11761da177e4SLinus Torvalds no_header: 11771da177e4SLinus Torvalds UDP_INC_STATS_BH(UDP_MIB_INERRORS); 11781da177e4SLinus Torvalds kfree_skb(skb); 11791da177e4SLinus Torvalds return(0); 11801da177e4SLinus Torvalds 11811da177e4SLinus Torvalds csum_error: 11821da177e4SLinus Torvalds /* 11831da177e4SLinus Torvalds * RFC1122: OK. Discards the bad packet silently (as far as 11841da177e4SLinus Torvalds * the network is concerned, anyway) as per 4.1.3.4 (MUST). 11851da177e4SLinus Torvalds */ 118664ce2073SPatrick McHardy LIMIT_NETDEBUG(KERN_DEBUG "UDP: bad checksum. From %d.%d.%d.%d:%d to %d.%d.%d.%d:%d ulen %d\n", 11871da177e4SLinus Torvalds NIPQUAD(saddr), 11881da177e4SLinus Torvalds ntohs(uh->source), 11891da177e4SLinus Torvalds NIPQUAD(daddr), 11901da177e4SLinus Torvalds ntohs(uh->dest), 119164ce2073SPatrick McHardy ulen); 11921da177e4SLinus Torvalds drop: 11931da177e4SLinus Torvalds UDP_INC_STATS_BH(UDP_MIB_INERRORS); 11941da177e4SLinus Torvalds kfree_skb(skb); 11951da177e4SLinus Torvalds return(0); 11961da177e4SLinus Torvalds } 11971da177e4SLinus Torvalds 11981da177e4SLinus Torvalds static int udp_destroy_sock(struct sock *sk) 11991da177e4SLinus Torvalds { 12001da177e4SLinus Torvalds lock_sock(sk); 12011da177e4SLinus Torvalds udp_flush_pending_frames(sk); 12021da177e4SLinus Torvalds release_sock(sk); 12031da177e4SLinus Torvalds return 0; 12041da177e4SLinus Torvalds } 12051da177e4SLinus Torvalds 12061da177e4SLinus Torvalds /* 12071da177e4SLinus Torvalds * Socket option code for UDP 12081da177e4SLinus Torvalds */ 12091da177e4SLinus Torvalds static int udp_setsockopt(struct sock *sk, int level, int optname, 12101da177e4SLinus Torvalds char __user *optval, int optlen) 12111da177e4SLinus Torvalds { 12121da177e4SLinus Torvalds struct udp_sock *up = udp_sk(sk); 12131da177e4SLinus Torvalds int val; 12141da177e4SLinus Torvalds int err = 0; 12151da177e4SLinus Torvalds 12161da177e4SLinus Torvalds if (level != SOL_UDP) 12171da177e4SLinus Torvalds return ip_setsockopt(sk, level, optname, optval, optlen); 12181da177e4SLinus Torvalds 12191da177e4SLinus Torvalds if(optlen<sizeof(int)) 12201da177e4SLinus Torvalds return -EINVAL; 12211da177e4SLinus Torvalds 12221da177e4SLinus Torvalds if (get_user(val, (int __user *)optval)) 12231da177e4SLinus Torvalds return -EFAULT; 12241da177e4SLinus Torvalds 12251da177e4SLinus Torvalds switch(optname) { 12261da177e4SLinus Torvalds case UDP_CORK: 12271da177e4SLinus Torvalds if (val != 0) { 12281da177e4SLinus Torvalds up->corkflag = 1; 12291da177e4SLinus Torvalds } else { 12301da177e4SLinus Torvalds up->corkflag = 0; 12311da177e4SLinus Torvalds lock_sock(sk); 12321da177e4SLinus Torvalds udp_push_pending_frames(sk, up); 12331da177e4SLinus Torvalds release_sock(sk); 12341da177e4SLinus Torvalds } 12351da177e4SLinus Torvalds break; 12361da177e4SLinus Torvalds 12371da177e4SLinus Torvalds case UDP_ENCAP: 12381da177e4SLinus Torvalds switch (val) { 12391da177e4SLinus Torvalds case 0: 12401da177e4SLinus Torvalds case UDP_ENCAP_ESPINUDP: 12411da177e4SLinus Torvalds case UDP_ENCAP_ESPINUDP_NON_IKE: 12421da177e4SLinus Torvalds up->encap_type = val; 12431da177e4SLinus Torvalds break; 12441da177e4SLinus Torvalds default: 12451da177e4SLinus Torvalds err = -ENOPROTOOPT; 12461da177e4SLinus Torvalds break; 12471da177e4SLinus Torvalds } 12481da177e4SLinus Torvalds break; 12491da177e4SLinus Torvalds 12501da177e4SLinus Torvalds default: 12511da177e4SLinus Torvalds err = -ENOPROTOOPT; 12521da177e4SLinus Torvalds break; 12531da177e4SLinus Torvalds }; 12541da177e4SLinus Torvalds 12551da177e4SLinus Torvalds return err; 12561da177e4SLinus Torvalds } 12571da177e4SLinus Torvalds 12581da177e4SLinus Torvalds static int udp_getsockopt(struct sock *sk, int level, int optname, 12591da177e4SLinus Torvalds char __user *optval, int __user *optlen) 12601da177e4SLinus Torvalds { 12611da177e4SLinus Torvalds struct udp_sock *up = udp_sk(sk); 12621da177e4SLinus Torvalds int val, len; 12631da177e4SLinus Torvalds 12641da177e4SLinus Torvalds if (level != SOL_UDP) 12651da177e4SLinus Torvalds return ip_getsockopt(sk, level, optname, optval, optlen); 12661da177e4SLinus Torvalds 12671da177e4SLinus Torvalds if(get_user(len,optlen)) 12681da177e4SLinus Torvalds return -EFAULT; 12691da177e4SLinus Torvalds 12701da177e4SLinus Torvalds len = min_t(unsigned int, len, sizeof(int)); 12711da177e4SLinus Torvalds 12721da177e4SLinus Torvalds if(len < 0) 12731da177e4SLinus Torvalds return -EINVAL; 12741da177e4SLinus Torvalds 12751da177e4SLinus Torvalds switch(optname) { 12761da177e4SLinus Torvalds case UDP_CORK: 12771da177e4SLinus Torvalds val = up->corkflag; 12781da177e4SLinus Torvalds break; 12791da177e4SLinus Torvalds 12801da177e4SLinus Torvalds case UDP_ENCAP: 12811da177e4SLinus Torvalds val = up->encap_type; 12821da177e4SLinus Torvalds break; 12831da177e4SLinus Torvalds 12841da177e4SLinus Torvalds default: 12851da177e4SLinus Torvalds return -ENOPROTOOPT; 12861da177e4SLinus Torvalds }; 12871da177e4SLinus Torvalds 12881da177e4SLinus Torvalds if(put_user(len, optlen)) 12891da177e4SLinus Torvalds return -EFAULT; 12901da177e4SLinus Torvalds if(copy_to_user(optval, &val,len)) 12911da177e4SLinus Torvalds return -EFAULT; 12921da177e4SLinus Torvalds return 0; 12931da177e4SLinus Torvalds } 12941da177e4SLinus Torvalds 12951da177e4SLinus Torvalds /** 12961da177e4SLinus Torvalds * udp_poll - wait for a UDP event. 12971da177e4SLinus Torvalds * @file - file struct 12981da177e4SLinus Torvalds * @sock - socket 12991da177e4SLinus Torvalds * @wait - poll table 13001da177e4SLinus Torvalds * 13011da177e4SLinus Torvalds * This is same as datagram poll, except for the special case of 13021da177e4SLinus Torvalds * blocking sockets. If application is using a blocking fd 13031da177e4SLinus Torvalds * and a packet with checksum error is in the queue; 13041da177e4SLinus Torvalds * then it could get return from select indicating data available 13051da177e4SLinus Torvalds * but then block when reading it. Add special case code 13061da177e4SLinus Torvalds * to work around these arguably broken applications. 13071da177e4SLinus Torvalds */ 13081da177e4SLinus Torvalds unsigned int udp_poll(struct file *file, struct socket *sock, poll_table *wait) 13091da177e4SLinus Torvalds { 13101da177e4SLinus Torvalds unsigned int mask = datagram_poll(file, sock, wait); 13111da177e4SLinus Torvalds struct sock *sk = sock->sk; 13121da177e4SLinus Torvalds 13131da177e4SLinus Torvalds /* Check for false positives due to checksum errors */ 13141da177e4SLinus Torvalds if ( (mask & POLLRDNORM) && 13151da177e4SLinus Torvalds !(file->f_flags & O_NONBLOCK) && 13161da177e4SLinus Torvalds !(sk->sk_shutdown & RCV_SHUTDOWN)){ 13171da177e4SLinus Torvalds struct sk_buff_head *rcvq = &sk->sk_receive_queue; 13181da177e4SLinus Torvalds struct sk_buff *skb; 13191da177e4SLinus Torvalds 1320208d8984SHerbert Xu spin_lock_bh(&rcvq->lock); 13211da177e4SLinus Torvalds while ((skb = skb_peek(rcvq)) != NULL) { 13221da177e4SLinus Torvalds if (udp_checksum_complete(skb)) { 13231da177e4SLinus Torvalds UDP_INC_STATS_BH(UDP_MIB_INERRORS); 13241da177e4SLinus Torvalds __skb_unlink(skb, rcvq); 13251da177e4SLinus Torvalds kfree_skb(skb); 13261da177e4SLinus Torvalds } else { 13271da177e4SLinus Torvalds skb->ip_summed = CHECKSUM_UNNECESSARY; 13281da177e4SLinus Torvalds break; 13291da177e4SLinus Torvalds } 13301da177e4SLinus Torvalds } 1331208d8984SHerbert Xu spin_unlock_bh(&rcvq->lock); 13321da177e4SLinus Torvalds 13331da177e4SLinus Torvalds /* nothing to see, move along */ 13341da177e4SLinus Torvalds if (skb == NULL) 13351da177e4SLinus Torvalds mask &= ~(POLLIN | POLLRDNORM); 13361da177e4SLinus Torvalds } 13371da177e4SLinus Torvalds 13381da177e4SLinus Torvalds return mask; 13391da177e4SLinus Torvalds 13401da177e4SLinus Torvalds } 13411da177e4SLinus Torvalds 13421da177e4SLinus Torvalds struct proto udp_prot = { 13431da177e4SLinus Torvalds .name = "UDP", 13441da177e4SLinus Torvalds .owner = THIS_MODULE, 13451da177e4SLinus Torvalds .close = udp_close, 13461da177e4SLinus Torvalds .connect = ip4_datagram_connect, 13471da177e4SLinus Torvalds .disconnect = udp_disconnect, 13481da177e4SLinus Torvalds .ioctl = udp_ioctl, 13491da177e4SLinus Torvalds .destroy = udp_destroy_sock, 13501da177e4SLinus Torvalds .setsockopt = udp_setsockopt, 13511da177e4SLinus Torvalds .getsockopt = udp_getsockopt, 13521da177e4SLinus Torvalds .sendmsg = udp_sendmsg, 13531da177e4SLinus Torvalds .recvmsg = udp_recvmsg, 13541da177e4SLinus Torvalds .sendpage = udp_sendpage, 13551da177e4SLinus Torvalds .backlog_rcv = udp_queue_rcv_skb, 13561da177e4SLinus Torvalds .hash = udp_v4_hash, 13571da177e4SLinus Torvalds .unhash = udp_v4_unhash, 13581da177e4SLinus Torvalds .get_port = udp_v4_get_port, 13591da177e4SLinus Torvalds .obj_size = sizeof(struct udp_sock), 13601da177e4SLinus Torvalds }; 13611da177e4SLinus Torvalds 13621da177e4SLinus Torvalds /* ------------------------------------------------------------------------ */ 13631da177e4SLinus Torvalds #ifdef CONFIG_PROC_FS 13641da177e4SLinus Torvalds 13651da177e4SLinus Torvalds static struct sock *udp_get_first(struct seq_file *seq) 13661da177e4SLinus Torvalds { 13671da177e4SLinus Torvalds struct sock *sk; 13681da177e4SLinus Torvalds struct udp_iter_state *state = seq->private; 13691da177e4SLinus Torvalds 13701da177e4SLinus Torvalds for (state->bucket = 0; state->bucket < UDP_HTABLE_SIZE; ++state->bucket) { 13711da177e4SLinus Torvalds struct hlist_node *node; 13721da177e4SLinus Torvalds sk_for_each(sk, node, &udp_hash[state->bucket]) { 13731da177e4SLinus Torvalds if (sk->sk_family == state->family) 13741da177e4SLinus Torvalds goto found; 13751da177e4SLinus Torvalds } 13761da177e4SLinus Torvalds } 13771da177e4SLinus Torvalds sk = NULL; 13781da177e4SLinus Torvalds found: 13791da177e4SLinus Torvalds return sk; 13801da177e4SLinus Torvalds } 13811da177e4SLinus Torvalds 13821da177e4SLinus Torvalds static struct sock *udp_get_next(struct seq_file *seq, struct sock *sk) 13831da177e4SLinus Torvalds { 13841da177e4SLinus Torvalds struct udp_iter_state *state = seq->private; 13851da177e4SLinus Torvalds 13861da177e4SLinus Torvalds do { 13871da177e4SLinus Torvalds sk = sk_next(sk); 13881da177e4SLinus Torvalds try_again: 13891da177e4SLinus Torvalds ; 13901da177e4SLinus Torvalds } while (sk && sk->sk_family != state->family); 13911da177e4SLinus Torvalds 13921da177e4SLinus Torvalds if (!sk && ++state->bucket < UDP_HTABLE_SIZE) { 13931da177e4SLinus Torvalds sk = sk_head(&udp_hash[state->bucket]); 13941da177e4SLinus Torvalds goto try_again; 13951da177e4SLinus Torvalds } 13961da177e4SLinus Torvalds return sk; 13971da177e4SLinus Torvalds } 13981da177e4SLinus Torvalds 13991da177e4SLinus Torvalds static struct sock *udp_get_idx(struct seq_file *seq, loff_t pos) 14001da177e4SLinus Torvalds { 14011da177e4SLinus Torvalds struct sock *sk = udp_get_first(seq); 14021da177e4SLinus Torvalds 14031da177e4SLinus Torvalds if (sk) 14041da177e4SLinus Torvalds while(pos && (sk = udp_get_next(seq, sk)) != NULL) 14051da177e4SLinus Torvalds --pos; 14061da177e4SLinus Torvalds return pos ? NULL : sk; 14071da177e4SLinus Torvalds } 14081da177e4SLinus Torvalds 14091da177e4SLinus Torvalds static void *udp_seq_start(struct seq_file *seq, loff_t *pos) 14101da177e4SLinus Torvalds { 14111da177e4SLinus Torvalds read_lock(&udp_hash_lock); 14121da177e4SLinus Torvalds return *pos ? udp_get_idx(seq, *pos-1) : (void *)1; 14131da177e4SLinus Torvalds } 14141da177e4SLinus Torvalds 14151da177e4SLinus Torvalds static void *udp_seq_next(struct seq_file *seq, void *v, loff_t *pos) 14161da177e4SLinus Torvalds { 14171da177e4SLinus Torvalds struct sock *sk; 14181da177e4SLinus Torvalds 14191da177e4SLinus Torvalds if (v == (void *)1) 14201da177e4SLinus Torvalds sk = udp_get_idx(seq, 0); 14211da177e4SLinus Torvalds else 14221da177e4SLinus Torvalds sk = udp_get_next(seq, v); 14231da177e4SLinus Torvalds 14241da177e4SLinus Torvalds ++*pos; 14251da177e4SLinus Torvalds return sk; 14261da177e4SLinus Torvalds } 14271da177e4SLinus Torvalds 14281da177e4SLinus Torvalds static void udp_seq_stop(struct seq_file *seq, void *v) 14291da177e4SLinus Torvalds { 14301da177e4SLinus Torvalds read_unlock(&udp_hash_lock); 14311da177e4SLinus Torvalds } 14321da177e4SLinus Torvalds 14331da177e4SLinus Torvalds static int udp_seq_open(struct inode *inode, struct file *file) 14341da177e4SLinus Torvalds { 14351da177e4SLinus Torvalds struct udp_seq_afinfo *afinfo = PDE(inode)->data; 14361da177e4SLinus Torvalds struct seq_file *seq; 14371da177e4SLinus Torvalds int rc = -ENOMEM; 14381da177e4SLinus Torvalds struct udp_iter_state *s = kmalloc(sizeof(*s), GFP_KERNEL); 14391da177e4SLinus Torvalds 14401da177e4SLinus Torvalds if (!s) 14411da177e4SLinus Torvalds goto out; 14421da177e4SLinus Torvalds memset(s, 0, sizeof(*s)); 14431da177e4SLinus Torvalds s->family = afinfo->family; 14441da177e4SLinus Torvalds s->seq_ops.start = udp_seq_start; 14451da177e4SLinus Torvalds s->seq_ops.next = udp_seq_next; 14461da177e4SLinus Torvalds s->seq_ops.show = afinfo->seq_show; 14471da177e4SLinus Torvalds s->seq_ops.stop = udp_seq_stop; 14481da177e4SLinus Torvalds 14491da177e4SLinus Torvalds rc = seq_open(file, &s->seq_ops); 14501da177e4SLinus Torvalds if (rc) 14511da177e4SLinus Torvalds goto out_kfree; 14521da177e4SLinus Torvalds 14531da177e4SLinus Torvalds seq = file->private_data; 14541da177e4SLinus Torvalds seq->private = s; 14551da177e4SLinus Torvalds out: 14561da177e4SLinus Torvalds return rc; 14571da177e4SLinus Torvalds out_kfree: 14581da177e4SLinus Torvalds kfree(s); 14591da177e4SLinus Torvalds goto out; 14601da177e4SLinus Torvalds } 14611da177e4SLinus Torvalds 14621da177e4SLinus Torvalds /* ------------------------------------------------------------------------ */ 14631da177e4SLinus Torvalds int udp_proc_register(struct udp_seq_afinfo *afinfo) 14641da177e4SLinus Torvalds { 14651da177e4SLinus Torvalds struct proc_dir_entry *p; 14661da177e4SLinus Torvalds int rc = 0; 14671da177e4SLinus Torvalds 14681da177e4SLinus Torvalds if (!afinfo) 14691da177e4SLinus Torvalds return -EINVAL; 14701da177e4SLinus Torvalds afinfo->seq_fops->owner = afinfo->owner; 14711da177e4SLinus Torvalds afinfo->seq_fops->open = udp_seq_open; 14721da177e4SLinus Torvalds afinfo->seq_fops->read = seq_read; 14731da177e4SLinus Torvalds afinfo->seq_fops->llseek = seq_lseek; 14741da177e4SLinus Torvalds afinfo->seq_fops->release = seq_release_private; 14751da177e4SLinus Torvalds 14761da177e4SLinus Torvalds p = proc_net_fops_create(afinfo->name, S_IRUGO, afinfo->seq_fops); 14771da177e4SLinus Torvalds if (p) 14781da177e4SLinus Torvalds p->data = afinfo; 14791da177e4SLinus Torvalds else 14801da177e4SLinus Torvalds rc = -ENOMEM; 14811da177e4SLinus Torvalds return rc; 14821da177e4SLinus Torvalds } 14831da177e4SLinus Torvalds 14841da177e4SLinus Torvalds void udp_proc_unregister(struct udp_seq_afinfo *afinfo) 14851da177e4SLinus Torvalds { 14861da177e4SLinus Torvalds if (!afinfo) 14871da177e4SLinus Torvalds return; 14881da177e4SLinus Torvalds proc_net_remove(afinfo->name); 14891da177e4SLinus Torvalds memset(afinfo->seq_fops, 0, sizeof(*afinfo->seq_fops)); 14901da177e4SLinus Torvalds } 14911da177e4SLinus Torvalds 14921da177e4SLinus Torvalds /* ------------------------------------------------------------------------ */ 14931da177e4SLinus Torvalds static void udp4_format_sock(struct sock *sp, char *tmpbuf, int bucket) 14941da177e4SLinus Torvalds { 14951da177e4SLinus Torvalds struct inet_sock *inet = inet_sk(sp); 14961da177e4SLinus Torvalds unsigned int dest = inet->daddr; 14971da177e4SLinus Torvalds unsigned int src = inet->rcv_saddr; 14981da177e4SLinus Torvalds __u16 destp = ntohs(inet->dport); 14991da177e4SLinus Torvalds __u16 srcp = ntohs(inet->sport); 15001da177e4SLinus Torvalds 15011da177e4SLinus Torvalds sprintf(tmpbuf, "%4d: %08X:%04X %08X:%04X" 15021da177e4SLinus Torvalds " %02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %p", 15031da177e4SLinus Torvalds bucket, src, srcp, dest, destp, sp->sk_state, 15041da177e4SLinus Torvalds atomic_read(&sp->sk_wmem_alloc), 15051da177e4SLinus Torvalds atomic_read(&sp->sk_rmem_alloc), 15061da177e4SLinus Torvalds 0, 0L, 0, sock_i_uid(sp), 0, sock_i_ino(sp), 15071da177e4SLinus Torvalds atomic_read(&sp->sk_refcnt), sp); 15081da177e4SLinus Torvalds } 15091da177e4SLinus Torvalds 15101da177e4SLinus Torvalds static int udp4_seq_show(struct seq_file *seq, void *v) 15111da177e4SLinus Torvalds { 15121da177e4SLinus Torvalds if (v == SEQ_START_TOKEN) 15131da177e4SLinus Torvalds seq_printf(seq, "%-127s\n", 15141da177e4SLinus Torvalds " sl local_address rem_address st tx_queue " 15151da177e4SLinus Torvalds "rx_queue tr tm->when retrnsmt uid timeout " 15161da177e4SLinus Torvalds "inode"); 15171da177e4SLinus Torvalds else { 15181da177e4SLinus Torvalds char tmpbuf[129]; 15191da177e4SLinus Torvalds struct udp_iter_state *state = seq->private; 15201da177e4SLinus Torvalds 15211da177e4SLinus Torvalds udp4_format_sock(v, tmpbuf, state->bucket); 15221da177e4SLinus Torvalds seq_printf(seq, "%-127s\n", tmpbuf); 15231da177e4SLinus Torvalds } 15241da177e4SLinus Torvalds return 0; 15251da177e4SLinus Torvalds } 15261da177e4SLinus Torvalds 15271da177e4SLinus Torvalds /* ------------------------------------------------------------------------ */ 15281da177e4SLinus Torvalds static struct file_operations udp4_seq_fops; 15291da177e4SLinus Torvalds static struct udp_seq_afinfo udp4_seq_afinfo = { 15301da177e4SLinus Torvalds .owner = THIS_MODULE, 15311da177e4SLinus Torvalds .name = "udp", 15321da177e4SLinus Torvalds .family = AF_INET, 15331da177e4SLinus Torvalds .seq_show = udp4_seq_show, 15341da177e4SLinus Torvalds .seq_fops = &udp4_seq_fops, 15351da177e4SLinus Torvalds }; 15361da177e4SLinus Torvalds 15371da177e4SLinus Torvalds int __init udp4_proc_init(void) 15381da177e4SLinus Torvalds { 15391da177e4SLinus Torvalds return udp_proc_register(&udp4_seq_afinfo); 15401da177e4SLinus Torvalds } 15411da177e4SLinus Torvalds 15421da177e4SLinus Torvalds void udp4_proc_exit(void) 15431da177e4SLinus Torvalds { 15441da177e4SLinus Torvalds udp_proc_unregister(&udp4_seq_afinfo); 15451da177e4SLinus Torvalds } 15461da177e4SLinus Torvalds #endif /* CONFIG_PROC_FS */ 15471da177e4SLinus Torvalds 15481da177e4SLinus Torvalds EXPORT_SYMBOL(udp_disconnect); 15491da177e4SLinus Torvalds EXPORT_SYMBOL(udp_hash); 15501da177e4SLinus Torvalds EXPORT_SYMBOL(udp_hash_lock); 15511da177e4SLinus Torvalds EXPORT_SYMBOL(udp_ioctl); 15521da177e4SLinus Torvalds EXPORT_SYMBOL(udp_port_rover); 15531da177e4SLinus Torvalds EXPORT_SYMBOL(udp_prot); 15541da177e4SLinus Torvalds EXPORT_SYMBOL(udp_sendmsg); 15551da177e4SLinus Torvalds EXPORT_SYMBOL(udp_poll); 15561da177e4SLinus Torvalds 15571da177e4SLinus Torvalds #ifdef CONFIG_PROC_FS 15581da177e4SLinus Torvalds EXPORT_SYMBOL(udp_proc_register); 15591da177e4SLinus Torvalds EXPORT_SYMBOL(udp_proc_unregister); 15601da177e4SLinus Torvalds #endif 1561