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> 8914c85021SArnaldo Carvalho de Melo #include <linux/igmp.h> 901da177e4SLinus Torvalds #include <linux/in.h> 911da177e4SLinus Torvalds #include <linux/errno.h> 921da177e4SLinus Torvalds #include <linux/timer.h> 931da177e4SLinus Torvalds #include <linux/mm.h> 941da177e4SLinus Torvalds #include <linux/inet.h> 951da177e4SLinus Torvalds #include <linux/netdevice.h> 96c752f073SArnaldo Carvalho de Melo #include <net/tcp_states.h> 971da177e4SLinus Torvalds #include <linux/skbuff.h> 981da177e4SLinus Torvalds #include <linux/proc_fs.h> 991da177e4SLinus Torvalds #include <linux/seq_file.h> 1001da177e4SLinus Torvalds #include <net/icmp.h> 1011da177e4SLinus Torvalds #include <net/route.h> 1021da177e4SLinus Torvalds #include <net/checksum.h> 1031da177e4SLinus Torvalds #include <net/xfrm.h> 104ba4e58ecSGerrit Renker #include "udp_impl.h" 1051da177e4SLinus Torvalds 1061da177e4SLinus Torvalds /* 1071da177e4SLinus Torvalds * Snmp MIB for the UDP layer 1081da177e4SLinus Torvalds */ 1091da177e4SLinus Torvalds 110ba89966cSEric Dumazet DEFINE_SNMP_STAT(struct udp_mib, udp_statistics) __read_mostly; 1111da177e4SLinus Torvalds 1121da177e4SLinus Torvalds struct hlist_head udp_hash[UDP_HTABLE_SIZE]; 1131da177e4SLinus Torvalds DEFINE_RWLOCK(udp_hash_lock); 1141da177e4SLinus Torvalds 115bed53ea7SDavid S. Miller static int udp_port_rover; 1161da177e4SLinus Torvalds 1178e5200f5SAl Viro static inline int __udp_lib_lport_inuse(__u16 num, struct hlist_head udptable[]) 11825030a7fSGerrit Renker { 11925030a7fSGerrit Renker struct sock *sk; 12025030a7fSGerrit Renker struct hlist_node *node; 12125030a7fSGerrit Renker 122ba4e58ecSGerrit Renker sk_for_each(sk, node, &udptable[num & (UDP_HTABLE_SIZE - 1)]) 12395f30b33SEric Dumazet if (sk->sk_hash == num) 12425030a7fSGerrit Renker return 1; 12525030a7fSGerrit Renker return 0; 12625030a7fSGerrit Renker } 12725030a7fSGerrit Renker 12825030a7fSGerrit Renker /** 129ba4e58ecSGerrit Renker * __udp_lib_get_port - UDP/-Lite port lookup for IPv4 and IPv6 13025030a7fSGerrit Renker * 13125030a7fSGerrit Renker * @sk: socket struct in question 13225030a7fSGerrit Renker * @snum: port number to look up 133ba4e58ecSGerrit Renker * @udptable: hash list table, must be of UDP_HTABLE_SIZE 134ba4e58ecSGerrit Renker * @port_rover: pointer to record of last unallocated port 13525030a7fSGerrit Renker * @saddr_comp: AF-dependent comparison of bound local IP addresses 13625030a7fSGerrit Renker */ 137ba4e58ecSGerrit Renker int __udp_lib_get_port(struct sock *sk, unsigned short snum, 138ba4e58ecSGerrit Renker struct hlist_head udptable[], int *port_rover, 139ba4e58ecSGerrit Renker int (*saddr_comp)(const struct sock *sk1, 140ba4e58ecSGerrit Renker const struct sock *sk2 ) ) 1411da177e4SLinus Torvalds { 1421da177e4SLinus Torvalds struct hlist_node *node; 14325030a7fSGerrit Renker struct hlist_head *head; 1441da177e4SLinus Torvalds struct sock *sk2; 14525030a7fSGerrit Renker int error = 1; 1461da177e4SLinus Torvalds 1471da177e4SLinus Torvalds write_lock_bh(&udp_hash_lock); 1481da177e4SLinus Torvalds if (snum == 0) { 1491da177e4SLinus Torvalds int best_size_so_far, best, result, i; 1501da177e4SLinus Torvalds 151ba4e58ecSGerrit Renker if (*port_rover > sysctl_local_port_range[1] || 152ba4e58ecSGerrit Renker *port_rover < sysctl_local_port_range[0]) 153ba4e58ecSGerrit Renker *port_rover = sysctl_local_port_range[0]; 1541da177e4SLinus Torvalds best_size_so_far = 32767; 155ba4e58ecSGerrit Renker best = result = *port_rover; 1561da177e4SLinus Torvalds for (i = 0; i < UDP_HTABLE_SIZE; i++, result++) { 1571da177e4SLinus Torvalds int size; 1581da177e4SLinus Torvalds 159ba4e58ecSGerrit Renker head = &udptable[result & (UDP_HTABLE_SIZE - 1)]; 16025030a7fSGerrit Renker if (hlist_empty(head)) { 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 goto gotit; 1661da177e4SLinus Torvalds } 1671da177e4SLinus Torvalds size = 0; 1685c668704SDavid S. Miller sk_for_each(sk2, node, head) { 1695c668704SDavid S. Miller if (++size >= best_size_so_far) 1705c668704SDavid S. Miller goto next; 1715c668704SDavid S. Miller } 1721da177e4SLinus Torvalds best_size_so_far = size; 1731da177e4SLinus Torvalds best = result; 1745c668704SDavid S. Miller next: 1755c668704SDavid S. Miller ; 1761da177e4SLinus Torvalds } 1771da177e4SLinus Torvalds result = best; 1786516c655SStephen Hemminger for (i = 0; i < (1 << 16) / UDP_HTABLE_SIZE; 1796516c655SStephen Hemminger i++, result += UDP_HTABLE_SIZE) { 1801da177e4SLinus Torvalds if (result > sysctl_local_port_range[1]) 1811da177e4SLinus Torvalds result = sysctl_local_port_range[0] 1821da177e4SLinus Torvalds + ((result - sysctl_local_port_range[0]) & 1831da177e4SLinus Torvalds (UDP_HTABLE_SIZE - 1)); 184ba4e58ecSGerrit Renker if (! __udp_lib_lport_inuse(result, udptable)) 1851da177e4SLinus Torvalds break; 1861da177e4SLinus Torvalds } 1871da177e4SLinus Torvalds if (i >= (1 << 16) / UDP_HTABLE_SIZE) 1881da177e4SLinus Torvalds goto fail; 1891da177e4SLinus Torvalds gotit: 190ba4e58ecSGerrit Renker *port_rover = snum = result; 1911da177e4SLinus Torvalds } else { 192ba4e58ecSGerrit Renker head = &udptable[snum & (UDP_HTABLE_SIZE - 1)]; 1931da177e4SLinus Torvalds 19425030a7fSGerrit Renker sk_for_each(sk2, node, head) 19595f30b33SEric Dumazet if (sk2->sk_hash == snum && 1961da177e4SLinus Torvalds sk2 != sk && 19725030a7fSGerrit Renker (!sk2->sk_reuse || !sk->sk_reuse) && 19825030a7fSGerrit Renker (!sk2->sk_bound_dev_if || !sk->sk_bound_dev_if 19925030a7fSGerrit Renker || sk2->sk_bound_dev_if == sk->sk_bound_dev_if) && 200ba4e58ecSGerrit Renker (*saddr_comp)(sk, sk2) ) 2011da177e4SLinus Torvalds goto fail; 2021da177e4SLinus Torvalds } 20325030a7fSGerrit Renker inet_sk(sk)->num = snum; 20495f30b33SEric Dumazet sk->sk_hash = snum; 2051da177e4SLinus Torvalds if (sk_unhashed(sk)) { 206ba4e58ecSGerrit Renker head = &udptable[snum & (UDP_HTABLE_SIZE - 1)]; 20725030a7fSGerrit Renker sk_add_node(sk, head); 2081da177e4SLinus Torvalds sock_prot_inc_use(sk->sk_prot); 2091da177e4SLinus Torvalds } 21025030a7fSGerrit Renker error = 0; 2111da177e4SLinus Torvalds fail: 2121da177e4SLinus Torvalds write_unlock_bh(&udp_hash_lock); 21325030a7fSGerrit Renker return error; 2141da177e4SLinus Torvalds } 2151da177e4SLinus Torvalds 2163fbe070aSStephen Hemminger int udp_get_port(struct sock *sk, unsigned short snum, 217ba4e58ecSGerrit Renker int (*scmp)(const struct sock *, const struct sock *)) 218ba4e58ecSGerrit Renker { 219ba4e58ecSGerrit Renker return __udp_lib_get_port(sk, snum, udp_hash, &udp_port_rover, scmp); 220ba4e58ecSGerrit Renker } 221ba4e58ecSGerrit Renker 2223fbe070aSStephen Hemminger int ipv4_rcv_saddr_equal(const struct sock *sk1, const struct sock *sk2) 22325030a7fSGerrit Renker { 22425030a7fSGerrit Renker struct inet_sock *inet1 = inet_sk(sk1), *inet2 = inet_sk(sk2); 22525030a7fSGerrit Renker 22625030a7fSGerrit Renker return ( !ipv6_only_sock(sk2) && 22725030a7fSGerrit Renker (!inet1->rcv_saddr || !inet2->rcv_saddr || 22825030a7fSGerrit Renker inet1->rcv_saddr == inet2->rcv_saddr )); 22925030a7fSGerrit Renker } 23025030a7fSGerrit Renker 23125030a7fSGerrit Renker static inline int udp_v4_get_port(struct sock *sk, unsigned short snum) 23225030a7fSGerrit Renker { 23325030a7fSGerrit Renker return udp_get_port(sk, snum, ipv4_rcv_saddr_equal); 23425030a7fSGerrit Renker } 23525030a7fSGerrit Renker 2361da177e4SLinus Torvalds /* UDP is nearly always wildcards out the wazoo, it makes no sense to try 2371da177e4SLinus Torvalds * harder than this. -DaveM 2381da177e4SLinus Torvalds */ 239ba4e58ecSGerrit Renker static struct sock *__udp4_lib_lookup(__be32 saddr, __be16 sport, 240ba4e58ecSGerrit Renker __be32 daddr, __be16 dport, 241ba4e58ecSGerrit Renker int dif, struct hlist_head udptable[]) 2421da177e4SLinus Torvalds { 2431da177e4SLinus Torvalds struct sock *sk, *result = NULL; 2441da177e4SLinus Torvalds struct hlist_node *node; 2451da177e4SLinus Torvalds unsigned short hnum = ntohs(dport); 2461da177e4SLinus Torvalds int badness = -1; 2471da177e4SLinus Torvalds 248ba4e58ecSGerrit Renker read_lock(&udp_hash_lock); 249ba4e58ecSGerrit Renker sk_for_each(sk, node, &udptable[hnum & (UDP_HTABLE_SIZE - 1)]) { 2501da177e4SLinus Torvalds struct inet_sock *inet = inet_sk(sk); 2511da177e4SLinus Torvalds 25295f30b33SEric Dumazet if (sk->sk_hash == hnum && !ipv6_only_sock(sk)) { 2531da177e4SLinus Torvalds int score = (sk->sk_family == PF_INET ? 1 : 0); 2541da177e4SLinus Torvalds if (inet->rcv_saddr) { 2551da177e4SLinus Torvalds if (inet->rcv_saddr != daddr) 2561da177e4SLinus Torvalds continue; 2571da177e4SLinus Torvalds score+=2; 2581da177e4SLinus Torvalds } 2591da177e4SLinus Torvalds if (inet->daddr) { 2601da177e4SLinus Torvalds if (inet->daddr != saddr) 2611da177e4SLinus Torvalds continue; 2621da177e4SLinus Torvalds score+=2; 2631da177e4SLinus Torvalds } 2641da177e4SLinus Torvalds if (inet->dport) { 2651da177e4SLinus Torvalds if (inet->dport != sport) 2661da177e4SLinus Torvalds continue; 2671da177e4SLinus Torvalds score+=2; 2681da177e4SLinus Torvalds } 2691da177e4SLinus Torvalds if (sk->sk_bound_dev_if) { 2701da177e4SLinus Torvalds if (sk->sk_bound_dev_if != dif) 2711da177e4SLinus Torvalds continue; 2721da177e4SLinus Torvalds score+=2; 2731da177e4SLinus Torvalds } 2741da177e4SLinus Torvalds if (score == 9) { 2751da177e4SLinus Torvalds result = sk; 2761da177e4SLinus Torvalds break; 2771da177e4SLinus Torvalds } else if (score > badness) { 2781da177e4SLinus Torvalds result = sk; 2791da177e4SLinus Torvalds badness = score; 2801da177e4SLinus Torvalds } 2811da177e4SLinus Torvalds } 2821da177e4SLinus Torvalds } 283ba4e58ecSGerrit Renker if (result) 284ba4e58ecSGerrit Renker sock_hold(result); 2851da177e4SLinus Torvalds read_unlock(&udp_hash_lock); 286ba4e58ecSGerrit Renker return result; 2871da177e4SLinus Torvalds } 2881da177e4SLinus Torvalds 2891da177e4SLinus Torvalds static inline struct sock *udp_v4_mcast_next(struct sock *sk, 290734ab87fSAl Viro __be16 loc_port, __be32 loc_addr, 291734ab87fSAl Viro __be16 rmt_port, __be32 rmt_addr, 2921da177e4SLinus Torvalds int dif) 2931da177e4SLinus Torvalds { 2941da177e4SLinus Torvalds struct hlist_node *node; 2951da177e4SLinus Torvalds struct sock *s = sk; 2961da177e4SLinus Torvalds unsigned short hnum = ntohs(loc_port); 2971da177e4SLinus Torvalds 2981da177e4SLinus Torvalds sk_for_each_from(s, node) { 2991da177e4SLinus Torvalds struct inet_sock *inet = inet_sk(s); 3001da177e4SLinus Torvalds 30195f30b33SEric Dumazet if (s->sk_hash != hnum || 3021da177e4SLinus Torvalds (inet->daddr && inet->daddr != rmt_addr) || 3031da177e4SLinus Torvalds (inet->dport != rmt_port && inet->dport) || 3041da177e4SLinus Torvalds (inet->rcv_saddr && inet->rcv_saddr != loc_addr) || 3051da177e4SLinus Torvalds ipv6_only_sock(s) || 3061da177e4SLinus Torvalds (s->sk_bound_dev_if && s->sk_bound_dev_if != dif)) 3071da177e4SLinus Torvalds continue; 3081da177e4SLinus Torvalds if (!ip_mc_sf_allow(s, loc_addr, rmt_addr, dif)) 3091da177e4SLinus Torvalds continue; 3101da177e4SLinus Torvalds goto found; 3111da177e4SLinus Torvalds } 3121da177e4SLinus Torvalds s = NULL; 3131da177e4SLinus Torvalds found: 3141da177e4SLinus Torvalds return s; 3151da177e4SLinus Torvalds } 3161da177e4SLinus Torvalds 3171da177e4SLinus Torvalds /* 3181da177e4SLinus Torvalds * This routine is called by the ICMP module when it gets some 3191da177e4SLinus Torvalds * sort of error condition. If err < 0 then the socket should 3201da177e4SLinus Torvalds * be closed and the error returned to the user. If err > 0 3211da177e4SLinus Torvalds * it's just the icmp type << 8 | icmp code. 3221da177e4SLinus Torvalds * Header points to the ip header of the error packet. We move 3231da177e4SLinus Torvalds * on past this. Then (as it used to claim before adjustment) 3241da177e4SLinus Torvalds * header points to the first 8 bytes of the udp header. We need 3251da177e4SLinus Torvalds * to find the appropriate port. 3261da177e4SLinus Torvalds */ 3271da177e4SLinus Torvalds 328ba4e58ecSGerrit Renker void __udp4_lib_err(struct sk_buff *skb, u32 info, struct hlist_head udptable[]) 3291da177e4SLinus Torvalds { 3301da177e4SLinus Torvalds struct inet_sock *inet; 3311da177e4SLinus Torvalds struct iphdr *iph = (struct iphdr*)skb->data; 3321da177e4SLinus Torvalds struct udphdr *uh = (struct udphdr*)(skb->data+(iph->ihl<<2)); 3331da177e4SLinus Torvalds int type = skb->h.icmph->type; 3341da177e4SLinus Torvalds int code = skb->h.icmph->code; 3351da177e4SLinus Torvalds struct sock *sk; 3361da177e4SLinus Torvalds int harderr; 3371da177e4SLinus Torvalds int err; 3381da177e4SLinus Torvalds 339ba4e58ecSGerrit Renker sk = __udp4_lib_lookup(iph->daddr, uh->dest, iph->saddr, uh->source, 340ba4e58ecSGerrit Renker skb->dev->ifindex, udptable ); 3411da177e4SLinus Torvalds if (sk == NULL) { 3421da177e4SLinus Torvalds ICMP_INC_STATS_BH(ICMP_MIB_INERRORS); 3431da177e4SLinus Torvalds return; /* No socket for error */ 3441da177e4SLinus Torvalds } 3451da177e4SLinus Torvalds 3461da177e4SLinus Torvalds err = 0; 3471da177e4SLinus Torvalds harderr = 0; 3481da177e4SLinus Torvalds inet = inet_sk(sk); 3491da177e4SLinus Torvalds 3501da177e4SLinus Torvalds switch (type) { 3511da177e4SLinus Torvalds default: 3521da177e4SLinus Torvalds case ICMP_TIME_EXCEEDED: 3531da177e4SLinus Torvalds err = EHOSTUNREACH; 3541da177e4SLinus Torvalds break; 3551da177e4SLinus Torvalds case ICMP_SOURCE_QUENCH: 3561da177e4SLinus Torvalds goto out; 3571da177e4SLinus Torvalds case ICMP_PARAMETERPROB: 3581da177e4SLinus Torvalds err = EPROTO; 3591da177e4SLinus Torvalds harderr = 1; 3601da177e4SLinus Torvalds break; 3611da177e4SLinus Torvalds case ICMP_DEST_UNREACH: 3621da177e4SLinus Torvalds if (code == ICMP_FRAG_NEEDED) { /* Path MTU discovery */ 3631da177e4SLinus Torvalds if (inet->pmtudisc != IP_PMTUDISC_DONT) { 3641da177e4SLinus Torvalds err = EMSGSIZE; 3651da177e4SLinus Torvalds harderr = 1; 3661da177e4SLinus Torvalds break; 3671da177e4SLinus Torvalds } 3681da177e4SLinus Torvalds goto out; 3691da177e4SLinus Torvalds } 3701da177e4SLinus Torvalds err = EHOSTUNREACH; 3711da177e4SLinus Torvalds if (code <= NR_ICMP_UNREACH) { 3721da177e4SLinus Torvalds harderr = icmp_err_convert[code].fatal; 3731da177e4SLinus Torvalds err = icmp_err_convert[code].errno; 3741da177e4SLinus Torvalds } 3751da177e4SLinus Torvalds break; 3761da177e4SLinus Torvalds } 3771da177e4SLinus Torvalds 3781da177e4SLinus Torvalds /* 3791da177e4SLinus Torvalds * RFC1122: OK. Passes ICMP errors back to application, as per 3801da177e4SLinus Torvalds * 4.1.3.3. 3811da177e4SLinus Torvalds */ 3821da177e4SLinus Torvalds if (!inet->recverr) { 3831da177e4SLinus Torvalds if (!harderr || sk->sk_state != TCP_ESTABLISHED) 3841da177e4SLinus Torvalds goto out; 3851da177e4SLinus Torvalds } else { 3861da177e4SLinus Torvalds ip_icmp_error(sk, skb, err, uh->dest, info, (u8*)(uh+1)); 3871da177e4SLinus Torvalds } 3881da177e4SLinus Torvalds sk->sk_err = err; 3891da177e4SLinus Torvalds sk->sk_error_report(sk); 3901da177e4SLinus Torvalds out: 3911da177e4SLinus Torvalds sock_put(sk); 3921da177e4SLinus Torvalds } 3931da177e4SLinus Torvalds 3943fbe070aSStephen Hemminger void udp_err(struct sk_buff *skb, u32 info) 395ba4e58ecSGerrit Renker { 396ba4e58ecSGerrit Renker return __udp4_lib_err(skb, info, udp_hash); 397ba4e58ecSGerrit Renker } 398ba4e58ecSGerrit Renker 3991da177e4SLinus Torvalds /* 4001da177e4SLinus Torvalds * Throw away all pending data and cancel the corking. Socket is locked. 4011da177e4SLinus Torvalds */ 4021da177e4SLinus Torvalds static void udp_flush_pending_frames(struct sock *sk) 4031da177e4SLinus Torvalds { 4041da177e4SLinus Torvalds struct udp_sock *up = udp_sk(sk); 4051da177e4SLinus Torvalds 4061da177e4SLinus Torvalds if (up->pending) { 4071da177e4SLinus Torvalds up->len = 0; 4081da177e4SLinus Torvalds up->pending = 0; 4091da177e4SLinus Torvalds ip_flush_pending_frames(sk); 4101da177e4SLinus Torvalds } 4111da177e4SLinus Torvalds } 4121da177e4SLinus Torvalds 413ba4e58ecSGerrit Renker /** 414ba4e58ecSGerrit Renker * udp4_hwcsum_outgoing - handle outgoing HW checksumming 415ba4e58ecSGerrit Renker * @sk: socket we are sending on 416ba4e58ecSGerrit Renker * @skb: sk_buff containing the filled-in UDP header 417ba4e58ecSGerrit Renker * (checksum field must be zeroed out) 418ba4e58ecSGerrit Renker */ 419ba4e58ecSGerrit Renker static void udp4_hwcsum_outgoing(struct sock *sk, struct sk_buff *skb, 420ba4e58ecSGerrit Renker __be32 src, __be32 dst, int len ) 421ba4e58ecSGerrit Renker { 4226b11687eSAl Viro unsigned int offset; 423*4bedb452SArnaldo Carvalho de Melo struct udphdr *uh = udp_hdr(skb); 4246b11687eSAl Viro __wsum csum = 0; 425ba4e58ecSGerrit Renker 426ba4e58ecSGerrit Renker if (skb_queue_len(&sk->sk_write_queue) == 1) { 427ba4e58ecSGerrit Renker /* 428ba4e58ecSGerrit Renker * Only one fragment on the socket. 429ba4e58ecSGerrit Renker */ 430ff1dcadbSAl Viro skb->csum_offset = offsetof(struct udphdr, check); 431ba4e58ecSGerrit Renker uh->check = ~csum_tcpudp_magic(src, dst, len, IPPROTO_UDP, 0); 432ba4e58ecSGerrit Renker } else { 433ba4e58ecSGerrit Renker /* 434ba4e58ecSGerrit Renker * HW-checksum won't work as there are two or more 435ba4e58ecSGerrit Renker * fragments on the socket so that all csums of sk_buffs 436ba4e58ecSGerrit Renker * should be together 437ba4e58ecSGerrit Renker */ 438ea2ae17dSArnaldo Carvalho de Melo offset = skb_transport_offset(skb); 439ba4e58ecSGerrit Renker skb->csum = skb_checksum(skb, offset, skb->len - offset, 0); 440ba4e58ecSGerrit Renker 441ba4e58ecSGerrit Renker skb->ip_summed = CHECKSUM_NONE; 442ba4e58ecSGerrit Renker 443ba4e58ecSGerrit Renker skb_queue_walk(&sk->sk_write_queue, skb) { 444ba4e58ecSGerrit Renker csum = csum_add(csum, skb->csum); 445ba4e58ecSGerrit Renker } 446ba4e58ecSGerrit Renker 447ba4e58ecSGerrit Renker uh->check = csum_tcpudp_magic(src, dst, len, IPPROTO_UDP, csum); 448ba4e58ecSGerrit Renker if (uh->check == 0) 449f6ab0288SAl Viro uh->check = CSUM_MANGLED_0; 450ba4e58ecSGerrit Renker } 451ba4e58ecSGerrit Renker } 452ba4e58ecSGerrit Renker 4531da177e4SLinus Torvalds /* 4541da177e4SLinus Torvalds * Push out all pending data as one UDP datagram. Socket is locked. 4551da177e4SLinus Torvalds */ 4564c0a6cb0SGerrit Renker static int udp_push_pending_frames(struct sock *sk) 4571da177e4SLinus Torvalds { 4584c0a6cb0SGerrit Renker struct udp_sock *up = udp_sk(sk); 4591da177e4SLinus Torvalds struct inet_sock *inet = inet_sk(sk); 4601da177e4SLinus Torvalds struct flowi *fl = &inet->cork.fl; 4611da177e4SLinus Torvalds struct sk_buff *skb; 4621da177e4SLinus Torvalds struct udphdr *uh; 4631da177e4SLinus Torvalds int err = 0; 4648e5200f5SAl Viro __wsum csum = 0; 4651da177e4SLinus Torvalds 4661da177e4SLinus Torvalds /* Grab the skbuff where UDP header space exists. */ 4671da177e4SLinus Torvalds if ((skb = skb_peek(&sk->sk_write_queue)) == NULL) 4681da177e4SLinus Torvalds goto out; 4691da177e4SLinus Torvalds 4701da177e4SLinus Torvalds /* 4711da177e4SLinus Torvalds * Create a UDP header 4721da177e4SLinus Torvalds */ 473*4bedb452SArnaldo Carvalho de Melo uh = udp_hdr(skb); 4741da177e4SLinus Torvalds uh->source = fl->fl_ip_sport; 4751da177e4SLinus Torvalds uh->dest = fl->fl_ip_dport; 4761da177e4SLinus Torvalds uh->len = htons(up->len); 4771da177e4SLinus Torvalds uh->check = 0; 4781da177e4SLinus Torvalds 479ba4e58ecSGerrit Renker if (up->pcflag) /* UDP-Lite */ 480ba4e58ecSGerrit Renker csum = udplite_csum_outgoing(sk, skb); 481ba4e58ecSGerrit Renker 482ba4e58ecSGerrit Renker else if (sk->sk_no_check == UDP_CSUM_NOXMIT) { /* UDP csum disabled */ 483ba4e58ecSGerrit Renker 4841da177e4SLinus Torvalds skb->ip_summed = CHECKSUM_NONE; 4851da177e4SLinus Torvalds goto send; 4861da177e4SLinus Torvalds 487ba4e58ecSGerrit Renker } else if (skb->ip_summed == CHECKSUM_PARTIAL) { /* UDP hardware csum */ 488ba4e58ecSGerrit Renker 489ba4e58ecSGerrit Renker udp4_hwcsum_outgoing(sk, skb, fl->fl4_src,fl->fl4_dst, up->len); 490ba4e58ecSGerrit Renker goto send; 491ba4e58ecSGerrit Renker 492ba4e58ecSGerrit Renker } else /* `normal' UDP */ 493ba4e58ecSGerrit Renker csum = udp_csum_outgoing(sk, skb); 494ba4e58ecSGerrit Renker 495ba4e58ecSGerrit Renker /* add protocol-dependent pseudo-header */ 496ba4e58ecSGerrit Renker uh->check = csum_tcpudp_magic(fl->fl4_src, fl->fl4_dst, up->len, 497ba4e58ecSGerrit Renker sk->sk_protocol, csum ); 4981da177e4SLinus Torvalds if (uh->check == 0) 499f6ab0288SAl Viro uh->check = CSUM_MANGLED_0; 5001da177e4SLinus Torvalds 5011da177e4SLinus Torvalds send: 5021da177e4SLinus Torvalds err = ip_push_pending_frames(sk); 5031da177e4SLinus Torvalds out: 5041da177e4SLinus Torvalds up->len = 0; 5051da177e4SLinus Torvalds up->pending = 0; 5061da177e4SLinus Torvalds return err; 5071da177e4SLinus Torvalds } 5081da177e4SLinus Torvalds 5091da177e4SLinus Torvalds int udp_sendmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg, 5101da177e4SLinus Torvalds size_t len) 5111da177e4SLinus Torvalds { 5121da177e4SLinus Torvalds struct inet_sock *inet = inet_sk(sk); 5131da177e4SLinus Torvalds struct udp_sock *up = udp_sk(sk); 5141da177e4SLinus Torvalds int ulen = len; 5151da177e4SLinus Torvalds struct ipcm_cookie ipc; 5161da177e4SLinus Torvalds struct rtable *rt = NULL; 5171da177e4SLinus Torvalds int free = 0; 5181da177e4SLinus Torvalds int connected = 0; 5193ca3c68eSAl Viro __be32 daddr, faddr, saddr; 520734ab87fSAl Viro __be16 dport; 5211da177e4SLinus Torvalds u8 tos; 522ba4e58ecSGerrit Renker int err, is_udplite = up->pcflag; 5231da177e4SLinus Torvalds int corkreq = up->corkflag || msg->msg_flags&MSG_MORE; 524ba4e58ecSGerrit Renker int (*getfrag)(void *, char *, int, int, int, struct sk_buff *); 5251da177e4SLinus Torvalds 5261da177e4SLinus Torvalds if (len > 0xFFFF) 5271da177e4SLinus Torvalds return -EMSGSIZE; 5281da177e4SLinus Torvalds 5291da177e4SLinus Torvalds /* 5301da177e4SLinus Torvalds * Check the flags. 5311da177e4SLinus Torvalds */ 5321da177e4SLinus Torvalds 5331da177e4SLinus Torvalds if (msg->msg_flags&MSG_OOB) /* Mirror BSD error message compatibility */ 5341da177e4SLinus Torvalds return -EOPNOTSUPP; 5351da177e4SLinus Torvalds 5361da177e4SLinus Torvalds ipc.opt = NULL; 5371da177e4SLinus Torvalds 5381da177e4SLinus Torvalds if (up->pending) { 5391da177e4SLinus Torvalds /* 5401da177e4SLinus Torvalds * There are pending frames. 5411da177e4SLinus Torvalds * The socket lock must be held while it's corked. 5421da177e4SLinus Torvalds */ 5431da177e4SLinus Torvalds lock_sock(sk); 5441da177e4SLinus Torvalds if (likely(up->pending)) { 5451da177e4SLinus Torvalds if (unlikely(up->pending != AF_INET)) { 5461da177e4SLinus Torvalds release_sock(sk); 5471da177e4SLinus Torvalds return -EINVAL; 5481da177e4SLinus Torvalds } 5491da177e4SLinus Torvalds goto do_append_data; 5501da177e4SLinus Torvalds } 5511da177e4SLinus Torvalds release_sock(sk); 5521da177e4SLinus Torvalds } 5531da177e4SLinus Torvalds ulen += sizeof(struct udphdr); 5541da177e4SLinus Torvalds 5551da177e4SLinus Torvalds /* 5561da177e4SLinus Torvalds * Get and verify the address. 5571da177e4SLinus Torvalds */ 5581da177e4SLinus Torvalds if (msg->msg_name) { 5591da177e4SLinus Torvalds struct sockaddr_in * usin = (struct sockaddr_in*)msg->msg_name; 5601da177e4SLinus Torvalds if (msg->msg_namelen < sizeof(*usin)) 5611da177e4SLinus Torvalds return -EINVAL; 5621da177e4SLinus Torvalds if (usin->sin_family != AF_INET) { 5631da177e4SLinus Torvalds if (usin->sin_family != AF_UNSPEC) 5641da177e4SLinus Torvalds return -EAFNOSUPPORT; 5651da177e4SLinus Torvalds } 5661da177e4SLinus Torvalds 5671da177e4SLinus Torvalds daddr = usin->sin_addr.s_addr; 5681da177e4SLinus Torvalds dport = usin->sin_port; 5691da177e4SLinus Torvalds if (dport == 0) 5701da177e4SLinus Torvalds return -EINVAL; 5711da177e4SLinus Torvalds } else { 5721da177e4SLinus Torvalds if (sk->sk_state != TCP_ESTABLISHED) 5731da177e4SLinus Torvalds return -EDESTADDRREQ; 5741da177e4SLinus Torvalds daddr = inet->daddr; 5751da177e4SLinus Torvalds dport = inet->dport; 5761da177e4SLinus Torvalds /* Open fast path for connected socket. 5771da177e4SLinus Torvalds Route will not be used, if at least one option is set. 5781da177e4SLinus Torvalds */ 5791da177e4SLinus Torvalds connected = 1; 5801da177e4SLinus Torvalds } 5811da177e4SLinus Torvalds ipc.addr = inet->saddr; 5821da177e4SLinus Torvalds 5831da177e4SLinus Torvalds ipc.oif = sk->sk_bound_dev_if; 5841da177e4SLinus Torvalds if (msg->msg_controllen) { 5851da177e4SLinus Torvalds err = ip_cmsg_send(msg, &ipc); 5861da177e4SLinus Torvalds if (err) 5871da177e4SLinus Torvalds return err; 5881da177e4SLinus Torvalds if (ipc.opt) 5891da177e4SLinus Torvalds free = 1; 5901da177e4SLinus Torvalds connected = 0; 5911da177e4SLinus Torvalds } 5921da177e4SLinus Torvalds if (!ipc.opt) 5931da177e4SLinus Torvalds ipc.opt = inet->opt; 5941da177e4SLinus Torvalds 5951da177e4SLinus Torvalds saddr = ipc.addr; 5961da177e4SLinus Torvalds ipc.addr = faddr = daddr; 5971da177e4SLinus Torvalds 5981da177e4SLinus Torvalds if (ipc.opt && ipc.opt->srr) { 5991da177e4SLinus Torvalds if (!daddr) 6001da177e4SLinus Torvalds return -EINVAL; 6011da177e4SLinus Torvalds faddr = ipc.opt->faddr; 6021da177e4SLinus Torvalds connected = 0; 6031da177e4SLinus Torvalds } 6041da177e4SLinus Torvalds tos = RT_TOS(inet->tos); 6051da177e4SLinus Torvalds if (sock_flag(sk, SOCK_LOCALROUTE) || 6061da177e4SLinus Torvalds (msg->msg_flags & MSG_DONTROUTE) || 6071da177e4SLinus Torvalds (ipc.opt && ipc.opt->is_strictroute)) { 6081da177e4SLinus Torvalds tos |= RTO_ONLINK; 6091da177e4SLinus Torvalds connected = 0; 6101da177e4SLinus Torvalds } 6111da177e4SLinus Torvalds 6121da177e4SLinus Torvalds if (MULTICAST(daddr)) { 6131da177e4SLinus Torvalds if (!ipc.oif) 6141da177e4SLinus Torvalds ipc.oif = inet->mc_index; 6151da177e4SLinus Torvalds if (!saddr) 6161da177e4SLinus Torvalds saddr = inet->mc_addr; 6171da177e4SLinus Torvalds connected = 0; 6181da177e4SLinus Torvalds } 6191da177e4SLinus Torvalds 6201da177e4SLinus Torvalds if (connected) 6211da177e4SLinus Torvalds rt = (struct rtable*)sk_dst_check(sk, 0); 6221da177e4SLinus Torvalds 6231da177e4SLinus Torvalds if (rt == NULL) { 6241da177e4SLinus Torvalds struct flowi fl = { .oif = ipc.oif, 6251da177e4SLinus Torvalds .nl_u = { .ip4_u = 6261da177e4SLinus Torvalds { .daddr = faddr, 6271da177e4SLinus Torvalds .saddr = saddr, 6281da177e4SLinus Torvalds .tos = tos } }, 629ba4e58ecSGerrit Renker .proto = sk->sk_protocol, 6301da177e4SLinus Torvalds .uli_u = { .ports = 6311da177e4SLinus Torvalds { .sport = inet->sport, 6321da177e4SLinus Torvalds .dport = dport } } }; 633beb8d13bSVenkat Yekkirala security_sk_classify_flow(sk, &fl); 6348eb9086fSDavid S. Miller err = ip_route_output_flow(&rt, &fl, sk, 1); 6351da177e4SLinus Torvalds if (err) 6361da177e4SLinus Torvalds goto out; 6371da177e4SLinus Torvalds 6381da177e4SLinus Torvalds err = -EACCES; 6391da177e4SLinus Torvalds if ((rt->rt_flags & RTCF_BROADCAST) && 6401da177e4SLinus Torvalds !sock_flag(sk, SOCK_BROADCAST)) 6411da177e4SLinus Torvalds goto out; 6421da177e4SLinus Torvalds if (connected) 6431da177e4SLinus Torvalds sk_dst_set(sk, dst_clone(&rt->u.dst)); 6441da177e4SLinus Torvalds } 6451da177e4SLinus Torvalds 6461da177e4SLinus Torvalds if (msg->msg_flags&MSG_CONFIRM) 6471da177e4SLinus Torvalds goto do_confirm; 6481da177e4SLinus Torvalds back_from_confirm: 6491da177e4SLinus Torvalds 6501da177e4SLinus Torvalds saddr = rt->rt_src; 6511da177e4SLinus Torvalds if (!ipc.addr) 6521da177e4SLinus Torvalds daddr = ipc.addr = rt->rt_dst; 6531da177e4SLinus Torvalds 6541da177e4SLinus Torvalds lock_sock(sk); 6551da177e4SLinus Torvalds if (unlikely(up->pending)) { 6561da177e4SLinus Torvalds /* The socket is already corked while preparing it. */ 6571da177e4SLinus Torvalds /* ... which is an evident application bug. --ANK */ 6581da177e4SLinus Torvalds release_sock(sk); 6591da177e4SLinus Torvalds 66064ce2073SPatrick McHardy LIMIT_NETDEBUG(KERN_DEBUG "udp cork app bug 2\n"); 6611da177e4SLinus Torvalds err = -EINVAL; 6621da177e4SLinus Torvalds goto out; 6631da177e4SLinus Torvalds } 6641da177e4SLinus Torvalds /* 6651da177e4SLinus Torvalds * Now cork the socket to pend data. 6661da177e4SLinus Torvalds */ 6671da177e4SLinus Torvalds inet->cork.fl.fl4_dst = daddr; 6681da177e4SLinus Torvalds inet->cork.fl.fl_ip_dport = dport; 6691da177e4SLinus Torvalds inet->cork.fl.fl4_src = saddr; 6701da177e4SLinus Torvalds inet->cork.fl.fl_ip_sport = inet->sport; 6711da177e4SLinus Torvalds up->pending = AF_INET; 6721da177e4SLinus Torvalds 6731da177e4SLinus Torvalds do_append_data: 6741da177e4SLinus Torvalds up->len += ulen; 675ba4e58ecSGerrit Renker getfrag = is_udplite ? udplite_getfrag : ip_generic_getfrag; 676ba4e58ecSGerrit Renker err = ip_append_data(sk, getfrag, msg->msg_iov, ulen, 6771da177e4SLinus Torvalds sizeof(struct udphdr), &ipc, rt, 6781da177e4SLinus Torvalds corkreq ? msg->msg_flags|MSG_MORE : msg->msg_flags); 6791da177e4SLinus Torvalds if (err) 6801da177e4SLinus Torvalds udp_flush_pending_frames(sk); 6811da177e4SLinus Torvalds else if (!corkreq) 6824c0a6cb0SGerrit Renker err = udp_push_pending_frames(sk); 6831e0c14f4SHerbert Xu else if (unlikely(skb_queue_empty(&sk->sk_write_queue))) 6841e0c14f4SHerbert Xu up->pending = 0; 6851da177e4SLinus Torvalds release_sock(sk); 6861da177e4SLinus Torvalds 6871da177e4SLinus Torvalds out: 6881da177e4SLinus Torvalds ip_rt_put(rt); 6891da177e4SLinus Torvalds if (free) 6901da177e4SLinus Torvalds kfree(ipc.opt); 6911da177e4SLinus Torvalds if (!err) { 692ba4e58ecSGerrit Renker UDP_INC_STATS_USER(UDP_MIB_OUTDATAGRAMS, is_udplite); 6931da177e4SLinus Torvalds return len; 6941da177e4SLinus Torvalds } 69581aa646cSMartin Bligh /* 69681aa646cSMartin Bligh * ENOBUFS = no kernel mem, SOCK_NOSPACE = no sndbuf space. Reporting 69781aa646cSMartin Bligh * ENOBUFS might not be good (it's not tunable per se), but otherwise 69881aa646cSMartin Bligh * we don't have a good statistic (IpOutDiscards but it can be too many 69981aa646cSMartin Bligh * things). We could add another new stat but at least for now that 70081aa646cSMartin Bligh * seems like overkill. 70181aa646cSMartin Bligh */ 70281aa646cSMartin Bligh if (err == -ENOBUFS || test_bit(SOCK_NOSPACE, &sk->sk_socket->flags)) { 703ba4e58ecSGerrit Renker UDP_INC_STATS_USER(UDP_MIB_SNDBUFERRORS, is_udplite); 70481aa646cSMartin Bligh } 7051da177e4SLinus Torvalds return err; 7061da177e4SLinus Torvalds 7071da177e4SLinus Torvalds do_confirm: 7081da177e4SLinus Torvalds dst_confirm(&rt->u.dst); 7091da177e4SLinus Torvalds if (!(msg->msg_flags&MSG_PROBE) || len) 7101da177e4SLinus Torvalds goto back_from_confirm; 7111da177e4SLinus Torvalds err = 0; 7121da177e4SLinus Torvalds goto out; 7131da177e4SLinus Torvalds } 7141da177e4SLinus Torvalds 715ba4e58ecSGerrit Renker int udp_sendpage(struct sock *sk, struct page *page, int offset, 7161da177e4SLinus Torvalds size_t size, int flags) 7171da177e4SLinus Torvalds { 7181da177e4SLinus Torvalds struct udp_sock *up = udp_sk(sk); 7191da177e4SLinus Torvalds int ret; 7201da177e4SLinus Torvalds 7211da177e4SLinus Torvalds if (!up->pending) { 7221da177e4SLinus Torvalds struct msghdr msg = { .msg_flags = flags|MSG_MORE }; 7231da177e4SLinus Torvalds 7241da177e4SLinus Torvalds /* Call udp_sendmsg to specify destination address which 7251da177e4SLinus Torvalds * sendpage interface can't pass. 7261da177e4SLinus Torvalds * This will succeed only when the socket is connected. 7271da177e4SLinus Torvalds */ 7281da177e4SLinus Torvalds ret = udp_sendmsg(NULL, sk, &msg, 0); 7291da177e4SLinus Torvalds if (ret < 0) 7301da177e4SLinus Torvalds return ret; 7311da177e4SLinus Torvalds } 7321da177e4SLinus Torvalds 7331da177e4SLinus Torvalds lock_sock(sk); 7341da177e4SLinus Torvalds 7351da177e4SLinus Torvalds if (unlikely(!up->pending)) { 7361da177e4SLinus Torvalds release_sock(sk); 7371da177e4SLinus Torvalds 73864ce2073SPatrick McHardy LIMIT_NETDEBUG(KERN_DEBUG "udp cork app bug 3\n"); 7391da177e4SLinus Torvalds return -EINVAL; 7401da177e4SLinus Torvalds } 7411da177e4SLinus Torvalds 7421da177e4SLinus Torvalds ret = ip_append_page(sk, page, offset, size, flags); 7431da177e4SLinus Torvalds if (ret == -EOPNOTSUPP) { 7441da177e4SLinus Torvalds release_sock(sk); 7451da177e4SLinus Torvalds return sock_no_sendpage(sk->sk_socket, page, offset, 7461da177e4SLinus Torvalds size, flags); 7471da177e4SLinus Torvalds } 7481da177e4SLinus Torvalds if (ret < 0) { 7491da177e4SLinus Torvalds udp_flush_pending_frames(sk); 7501da177e4SLinus Torvalds goto out; 7511da177e4SLinus Torvalds } 7521da177e4SLinus Torvalds 7531da177e4SLinus Torvalds up->len += size; 7541da177e4SLinus Torvalds if (!(up->corkflag || (flags&MSG_MORE))) 7554c0a6cb0SGerrit Renker ret = udp_push_pending_frames(sk); 7561da177e4SLinus Torvalds if (!ret) 7571da177e4SLinus Torvalds ret = size; 7581da177e4SLinus Torvalds out: 7591da177e4SLinus Torvalds release_sock(sk); 7601da177e4SLinus Torvalds return ret; 7611da177e4SLinus Torvalds } 7621da177e4SLinus Torvalds 7631da177e4SLinus Torvalds /* 7641da177e4SLinus Torvalds * IOCTL requests applicable to the UDP protocol 7651da177e4SLinus Torvalds */ 7661da177e4SLinus Torvalds 7671da177e4SLinus Torvalds int udp_ioctl(struct sock *sk, int cmd, unsigned long arg) 7681da177e4SLinus Torvalds { 7696516c655SStephen Hemminger switch (cmd) { 7701da177e4SLinus Torvalds case SIOCOUTQ: 7711da177e4SLinus Torvalds { 7721da177e4SLinus Torvalds int amount = atomic_read(&sk->sk_wmem_alloc); 7731da177e4SLinus Torvalds return put_user(amount, (int __user *)arg); 7741da177e4SLinus Torvalds } 7751da177e4SLinus Torvalds 7761da177e4SLinus Torvalds case SIOCINQ: 7771da177e4SLinus Torvalds { 7781da177e4SLinus Torvalds struct sk_buff *skb; 7791da177e4SLinus Torvalds unsigned long amount; 7801da177e4SLinus Torvalds 7811da177e4SLinus Torvalds amount = 0; 782208d8984SHerbert Xu spin_lock_bh(&sk->sk_receive_queue.lock); 7831da177e4SLinus Torvalds skb = skb_peek(&sk->sk_receive_queue); 7841da177e4SLinus Torvalds if (skb != NULL) { 7851da177e4SLinus Torvalds /* 7861da177e4SLinus Torvalds * We will only return the amount 7871da177e4SLinus Torvalds * of this packet since that is all 7881da177e4SLinus Torvalds * that will be read. 7891da177e4SLinus Torvalds */ 7901da177e4SLinus Torvalds amount = skb->len - sizeof(struct udphdr); 7911da177e4SLinus Torvalds } 792208d8984SHerbert Xu spin_unlock_bh(&sk->sk_receive_queue.lock); 7931da177e4SLinus Torvalds return put_user(amount, (int __user *)arg); 7941da177e4SLinus Torvalds } 7951da177e4SLinus Torvalds 7961da177e4SLinus Torvalds default: 7971da177e4SLinus Torvalds return -ENOIOCTLCMD; 7981da177e4SLinus Torvalds } 7996516c655SStephen Hemminger 8006516c655SStephen Hemminger return 0; 8011da177e4SLinus Torvalds } 8021da177e4SLinus Torvalds 8031da177e4SLinus Torvalds /* 8041da177e4SLinus Torvalds * This should be easy, if there is something there we 8051da177e4SLinus Torvalds * return it, otherwise we block. 8061da177e4SLinus Torvalds */ 8071da177e4SLinus Torvalds 808ba4e58ecSGerrit Renker int udp_recvmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg, 8091da177e4SLinus Torvalds size_t len, int noblock, int flags, int *addr_len) 8101da177e4SLinus Torvalds { 8111da177e4SLinus Torvalds struct inet_sock *inet = inet_sk(sk); 8121da177e4SLinus Torvalds struct sockaddr_in *sin = (struct sockaddr_in *)msg->msg_name; 8131da177e4SLinus Torvalds struct sk_buff *skb; 814759e5d00SHerbert Xu unsigned int ulen, copied; 815759e5d00SHerbert Xu int err; 816759e5d00SHerbert Xu int is_udplite = IS_UDPLITE(sk); 8171da177e4SLinus Torvalds 8181da177e4SLinus Torvalds /* 8191da177e4SLinus Torvalds * Check any passed addresses 8201da177e4SLinus Torvalds */ 8211da177e4SLinus Torvalds if (addr_len) 8221da177e4SLinus Torvalds *addr_len=sizeof(*sin); 8231da177e4SLinus Torvalds 8241da177e4SLinus Torvalds if (flags & MSG_ERRQUEUE) 8251da177e4SLinus Torvalds return ip_recv_error(sk, msg, len); 8261da177e4SLinus Torvalds 8271da177e4SLinus Torvalds try_again: 8281da177e4SLinus Torvalds skb = skb_recv_datagram(sk, flags, noblock, &err); 8291da177e4SLinus Torvalds if (!skb) 8301da177e4SLinus Torvalds goto out; 8311da177e4SLinus Torvalds 832759e5d00SHerbert Xu ulen = skb->len - sizeof(struct udphdr); 8331da177e4SLinus Torvalds copied = len; 834759e5d00SHerbert Xu if (copied > ulen) 835759e5d00SHerbert Xu copied = ulen; 836759e5d00SHerbert Xu else if (copied < ulen) 8371da177e4SLinus Torvalds msg->msg_flags |= MSG_TRUNC; 8381da177e4SLinus Torvalds 839ba4e58ecSGerrit Renker /* 840759e5d00SHerbert Xu * If checksum is needed at all, try to do it while copying the 841759e5d00SHerbert Xu * data. If the data is truncated, or if we only want a partial 842759e5d00SHerbert Xu * coverage checksum (UDP-Lite), do it before the copy. 843ba4e58ecSGerrit Renker */ 844ba4e58ecSGerrit Renker 845759e5d00SHerbert Xu if (copied < ulen || UDP_SKB_CB(skb)->partial_cov) { 846759e5d00SHerbert Xu if (udp_lib_checksum_complete(skb)) 8471da177e4SLinus Torvalds goto csum_copy_err; 848ba4e58ecSGerrit Renker } 849ba4e58ecSGerrit Renker 850759e5d00SHerbert Xu if (skb->ip_summed == CHECKSUM_UNNECESSARY) 851ba4e58ecSGerrit Renker err = skb_copy_datagram_iovec(skb, sizeof(struct udphdr), 852ba4e58ecSGerrit Renker msg->msg_iov, copied ); 853ba4e58ecSGerrit Renker else { 8541da177e4SLinus Torvalds err = skb_copy_and_csum_datagram_iovec(skb, sizeof(struct udphdr), msg->msg_iov); 8551da177e4SLinus Torvalds 8561da177e4SLinus Torvalds if (err == -EINVAL) 8571da177e4SLinus Torvalds goto csum_copy_err; 8581da177e4SLinus Torvalds } 8591da177e4SLinus Torvalds 8601da177e4SLinus Torvalds if (err) 8611da177e4SLinus Torvalds goto out_free; 8621da177e4SLinus Torvalds 8631da177e4SLinus Torvalds sock_recv_timestamp(msg, sk, skb); 8641da177e4SLinus Torvalds 8651da177e4SLinus Torvalds /* Copy the address. */ 8661da177e4SLinus Torvalds if (sin) 8671da177e4SLinus Torvalds { 8681da177e4SLinus Torvalds sin->sin_family = AF_INET; 869*4bedb452SArnaldo Carvalho de Melo sin->sin_port = udp_hdr(skb)->source; 870eddc9ec5SArnaldo Carvalho de Melo sin->sin_addr.s_addr = ip_hdr(skb)->saddr; 8711da177e4SLinus Torvalds memset(sin->sin_zero, 0, sizeof(sin->sin_zero)); 8721da177e4SLinus Torvalds } 8731da177e4SLinus Torvalds if (inet->cmsg_flags) 8741da177e4SLinus Torvalds ip_cmsg_recv(msg, skb); 8751da177e4SLinus Torvalds 8761da177e4SLinus Torvalds err = copied; 8771da177e4SLinus Torvalds if (flags & MSG_TRUNC) 878759e5d00SHerbert Xu err = ulen; 8791da177e4SLinus Torvalds 8801da177e4SLinus Torvalds out_free: 8811da177e4SLinus Torvalds skb_free_datagram(sk, skb); 8821da177e4SLinus Torvalds out: 8831da177e4SLinus Torvalds return err; 8841da177e4SLinus Torvalds 8851da177e4SLinus Torvalds csum_copy_err: 886ba4e58ecSGerrit Renker UDP_INC_STATS_BH(UDP_MIB_INERRORS, is_udplite); 8871da177e4SLinus Torvalds 8883305b80cSHerbert Xu skb_kill_datagram(sk, skb, flags); 8891da177e4SLinus Torvalds 8901da177e4SLinus Torvalds if (noblock) 8911da177e4SLinus Torvalds return -EAGAIN; 8921da177e4SLinus Torvalds goto try_again; 8931da177e4SLinus Torvalds } 8941da177e4SLinus Torvalds 8951da177e4SLinus Torvalds 8961da177e4SLinus Torvalds int udp_disconnect(struct sock *sk, int flags) 8971da177e4SLinus Torvalds { 8981da177e4SLinus Torvalds struct inet_sock *inet = inet_sk(sk); 8991da177e4SLinus Torvalds /* 9001da177e4SLinus Torvalds * 1003.1g - break association. 9011da177e4SLinus Torvalds */ 9021da177e4SLinus Torvalds 9031da177e4SLinus Torvalds sk->sk_state = TCP_CLOSE; 9041da177e4SLinus Torvalds inet->daddr = 0; 9051da177e4SLinus Torvalds inet->dport = 0; 9061da177e4SLinus Torvalds sk->sk_bound_dev_if = 0; 9071da177e4SLinus Torvalds if (!(sk->sk_userlocks & SOCK_BINDADDR_LOCK)) 9081da177e4SLinus Torvalds inet_reset_saddr(sk); 9091da177e4SLinus Torvalds 9101da177e4SLinus Torvalds if (!(sk->sk_userlocks & SOCK_BINDPORT_LOCK)) { 9111da177e4SLinus Torvalds sk->sk_prot->unhash(sk); 9121da177e4SLinus Torvalds inet->sport = 0; 9131da177e4SLinus Torvalds } 9141da177e4SLinus Torvalds sk_dst_reset(sk); 9151da177e4SLinus Torvalds return 0; 9161da177e4SLinus Torvalds } 9171da177e4SLinus Torvalds 9181da177e4SLinus Torvalds /* return: 9191da177e4SLinus Torvalds * 1 if the the UDP system should process it 9201da177e4SLinus Torvalds * 0 if we should drop this packet 9211da177e4SLinus Torvalds * -1 if it should get processed by xfrm4_rcv_encap 9221da177e4SLinus Torvalds */ 9231da177e4SLinus Torvalds static int udp_encap_rcv(struct sock * sk, struct sk_buff *skb) 9241da177e4SLinus Torvalds { 9251da177e4SLinus Torvalds #ifndef CONFIG_XFRM 9261da177e4SLinus Torvalds return 1; 9271da177e4SLinus Torvalds #else 9281da177e4SLinus Torvalds struct udp_sock *up = udp_sk(sk); 929753eab76SOlaf Kirch struct udphdr *uh; 9301da177e4SLinus Torvalds struct iphdr *iph; 9311da177e4SLinus Torvalds int iphlen, len; 9321da177e4SLinus Torvalds 933753eab76SOlaf Kirch __u8 *udpdata; 934753eab76SOlaf Kirch __be32 *udpdata32; 9351da177e4SLinus Torvalds __u16 encap_type = up->encap_type; 9361da177e4SLinus Torvalds 9371da177e4SLinus Torvalds /* if we're overly short, let UDP handle it */ 938753eab76SOlaf Kirch len = skb->len - sizeof(struct udphdr); 939753eab76SOlaf Kirch if (len <= 0) 9401da177e4SLinus Torvalds return 1; 9411da177e4SLinus Torvalds 9421da177e4SLinus Torvalds /* if this is not encapsulated socket, then just return now */ 9431da177e4SLinus Torvalds if (!encap_type) 9441da177e4SLinus Torvalds return 1; 9451da177e4SLinus Torvalds 946753eab76SOlaf Kirch /* If this is a paged skb, make sure we pull up 947753eab76SOlaf Kirch * whatever data we need to look at. */ 948753eab76SOlaf Kirch if (!pskb_may_pull(skb, sizeof(struct udphdr) + min(len, 8))) 949753eab76SOlaf Kirch return 1; 950753eab76SOlaf Kirch 951753eab76SOlaf Kirch /* Now we can get the pointers */ 952*4bedb452SArnaldo Carvalho de Melo uh = udp_hdr(skb); 953753eab76SOlaf Kirch udpdata = (__u8 *)uh + sizeof(struct udphdr); 954753eab76SOlaf Kirch udpdata32 = (__be32 *)udpdata; 9551da177e4SLinus Torvalds 9561da177e4SLinus Torvalds switch (encap_type) { 9571da177e4SLinus Torvalds default: 9581da177e4SLinus Torvalds case UDP_ENCAP_ESPINUDP: 9591da177e4SLinus Torvalds /* Check if this is a keepalive packet. If so, eat it. */ 9601da177e4SLinus Torvalds if (len == 1 && udpdata[0] == 0xff) { 9611da177e4SLinus Torvalds return 0; 9621da177e4SLinus Torvalds } else if (len > sizeof(struct ip_esp_hdr) && udpdata32[0] != 0) { 9631da177e4SLinus Torvalds /* ESP Packet without Non-ESP header */ 9641da177e4SLinus Torvalds len = sizeof(struct udphdr); 9651da177e4SLinus Torvalds } else 9661da177e4SLinus Torvalds /* Must be an IKE packet.. pass it through */ 9671da177e4SLinus Torvalds return 1; 9681da177e4SLinus Torvalds break; 9691da177e4SLinus Torvalds case UDP_ENCAP_ESPINUDP_NON_IKE: 9701da177e4SLinus Torvalds /* Check if this is a keepalive packet. If so, eat it. */ 9711da177e4SLinus Torvalds if (len == 1 && udpdata[0] == 0xff) { 9721da177e4SLinus Torvalds return 0; 9731da177e4SLinus Torvalds } else if (len > 2 * sizeof(u32) + sizeof(struct ip_esp_hdr) && 9741da177e4SLinus Torvalds udpdata32[0] == 0 && udpdata32[1] == 0) { 9751da177e4SLinus Torvalds 9761da177e4SLinus Torvalds /* ESP Packet with Non-IKE marker */ 9771da177e4SLinus Torvalds len = sizeof(struct udphdr) + 2 * sizeof(u32); 9781da177e4SLinus Torvalds } else 9791da177e4SLinus Torvalds /* Must be an IKE packet.. pass it through */ 9801da177e4SLinus Torvalds return 1; 9811da177e4SLinus Torvalds break; 9821da177e4SLinus Torvalds } 9831da177e4SLinus Torvalds 9841da177e4SLinus Torvalds /* At this point we are sure that this is an ESPinUDP packet, 9851da177e4SLinus Torvalds * so we need to remove 'len' bytes from the packet (the UDP 9861da177e4SLinus Torvalds * header and optional ESP marker bytes) and then modify the 9871da177e4SLinus Torvalds * protocol to ESP, and then call into the transform receiver. 9881da177e4SLinus Torvalds */ 9894d78b6c7SHerbert Xu if (skb_cloned(skb) && pskb_expand_head(skb, 0, 0, GFP_ATOMIC)) 9904d78b6c7SHerbert Xu return 0; 9911da177e4SLinus Torvalds 9921da177e4SLinus Torvalds /* Now we can update and verify the packet length... */ 993eddc9ec5SArnaldo Carvalho de Melo iph = ip_hdr(skb); 9941da177e4SLinus Torvalds iphlen = iph->ihl << 2; 9951da177e4SLinus Torvalds iph->tot_len = htons(ntohs(iph->tot_len) - len); 9961da177e4SLinus Torvalds if (skb->len < iphlen + len) { 9971da177e4SLinus Torvalds /* packet is too small!?! */ 9981da177e4SLinus Torvalds return 0; 9991da177e4SLinus Torvalds } 10001da177e4SLinus Torvalds 10011da177e4SLinus Torvalds /* pull the data buffer up to the ESP header and set the 10021da177e4SLinus Torvalds * transport header to point to ESP. Keep UDP on the stack 10031da177e4SLinus Torvalds * for later. 10041da177e4SLinus Torvalds */ 1005badff6d0SArnaldo Carvalho de Melo __skb_pull(skb, len); 1006badff6d0SArnaldo Carvalho de Melo skb_reset_transport_header(skb); 10071da177e4SLinus Torvalds 10081da177e4SLinus Torvalds /* modify the protocol (it's ESP!) */ 10091da177e4SLinus Torvalds iph->protocol = IPPROTO_ESP; 10101da177e4SLinus Torvalds 10111da177e4SLinus Torvalds /* and let the caller know to send this into the ESP processor... */ 10121da177e4SLinus Torvalds return -1; 10131da177e4SLinus Torvalds #endif 10141da177e4SLinus Torvalds } 10151da177e4SLinus Torvalds 10161da177e4SLinus Torvalds /* returns: 10171da177e4SLinus Torvalds * -1: error 10181da177e4SLinus Torvalds * 0: success 10191da177e4SLinus Torvalds * >0: "udp encap" protocol resubmission 10201da177e4SLinus Torvalds * 10211da177e4SLinus Torvalds * Note that in the success and error cases, the skb is assumed to 10221da177e4SLinus Torvalds * have either been requeued or freed. 10231da177e4SLinus Torvalds */ 1024ba4e58ecSGerrit Renker int udp_queue_rcv_skb(struct sock * sk, struct sk_buff *skb) 10251da177e4SLinus Torvalds { 10261da177e4SLinus Torvalds struct udp_sock *up = udp_sk(sk); 102781aa646cSMartin Bligh int rc; 10281da177e4SLinus Torvalds 10291da177e4SLinus Torvalds /* 10301da177e4SLinus Torvalds * Charge it to the socket, dropping if the queue is full. 10311da177e4SLinus Torvalds */ 1032ba4e58ecSGerrit Renker if (!xfrm4_policy_check(sk, XFRM_POLICY_IN, skb)) 1033ba4e58ecSGerrit Renker goto drop; 1034b59c2701SPatrick McHardy nf_reset(skb); 10351da177e4SLinus Torvalds 10361da177e4SLinus Torvalds if (up->encap_type) { 10371da177e4SLinus Torvalds /* 10381da177e4SLinus Torvalds * This is an encapsulation socket, so let's see if this is 10391da177e4SLinus Torvalds * an encapsulated packet. 10401da177e4SLinus Torvalds * If it's a keepalive packet, then just eat it. 10411da177e4SLinus Torvalds * If it's an encapsulateed packet, then pass it to the 10421da177e4SLinus Torvalds * IPsec xfrm input and return the response 10431da177e4SLinus Torvalds * appropriately. Otherwise, just fall through and 10441da177e4SLinus Torvalds * pass this up the UDP socket. 10451da177e4SLinus Torvalds */ 10461da177e4SLinus Torvalds int ret; 10471da177e4SLinus Torvalds 10481da177e4SLinus Torvalds ret = udp_encap_rcv(sk, skb); 10491da177e4SLinus Torvalds if (ret == 0) { 10501da177e4SLinus Torvalds /* Eat the packet .. */ 10511da177e4SLinus Torvalds kfree_skb(skb); 10521da177e4SLinus Torvalds return 0; 10531da177e4SLinus Torvalds } 10541da177e4SLinus Torvalds if (ret < 0) { 10551da177e4SLinus Torvalds /* process the ESP packet */ 10561da177e4SLinus Torvalds ret = xfrm4_rcv_encap(skb, up->encap_type); 1057ba4e58ecSGerrit Renker UDP_INC_STATS_BH(UDP_MIB_INDATAGRAMS, up->pcflag); 10581da177e4SLinus Torvalds return -ret; 10591da177e4SLinus Torvalds } 10601da177e4SLinus Torvalds /* FALLTHROUGH -- it's a UDP Packet */ 10611da177e4SLinus Torvalds } 10621da177e4SLinus Torvalds 1063ba4e58ecSGerrit Renker /* 1064ba4e58ecSGerrit Renker * UDP-Lite specific tests, ignored on UDP sockets 1065ba4e58ecSGerrit Renker */ 1066ba4e58ecSGerrit Renker if ((up->pcflag & UDPLITE_RECV_CC) && UDP_SKB_CB(skb)->partial_cov) { 1067ba4e58ecSGerrit Renker 1068ba4e58ecSGerrit Renker /* 1069ba4e58ecSGerrit Renker * MIB statistics other than incrementing the error count are 1070ba4e58ecSGerrit Renker * disabled for the following two types of errors: these depend 1071ba4e58ecSGerrit Renker * on the application settings, not on the functioning of the 1072ba4e58ecSGerrit Renker * protocol stack as such. 1073ba4e58ecSGerrit Renker * 1074ba4e58ecSGerrit Renker * RFC 3828 here recommends (sec 3.3): "There should also be a 1075ba4e58ecSGerrit Renker * way ... to ... at least let the receiving application block 1076ba4e58ecSGerrit Renker * delivery of packets with coverage values less than a value 1077ba4e58ecSGerrit Renker * provided by the application." 1078ba4e58ecSGerrit Renker */ 1079ba4e58ecSGerrit Renker if (up->pcrlen == 0) { /* full coverage was set */ 1080ba4e58ecSGerrit Renker LIMIT_NETDEBUG(KERN_WARNING "UDPLITE: partial coverage " 1081ba4e58ecSGerrit Renker "%d while full coverage %d requested\n", 1082ba4e58ecSGerrit Renker UDP_SKB_CB(skb)->cscov, skb->len); 1083ba4e58ecSGerrit Renker goto drop; 10841da177e4SLinus Torvalds } 1085ba4e58ecSGerrit Renker /* The next case involves violating the min. coverage requested 1086ba4e58ecSGerrit Renker * by the receiver. This is subtle: if receiver wants x and x is 1087ba4e58ecSGerrit Renker * greater than the buffersize/MTU then receiver will complain 1088ba4e58ecSGerrit Renker * that it wants x while sender emits packets of smaller size y. 1089ba4e58ecSGerrit Renker * Therefore the above ...()->partial_cov statement is essential. 1090ba4e58ecSGerrit Renker */ 1091ba4e58ecSGerrit Renker if (UDP_SKB_CB(skb)->cscov < up->pcrlen) { 1092ba4e58ecSGerrit Renker LIMIT_NETDEBUG(KERN_WARNING 1093ba4e58ecSGerrit Renker "UDPLITE: coverage %d too small, need min %d\n", 1094ba4e58ecSGerrit Renker UDP_SKB_CB(skb)->cscov, up->pcrlen); 1095ba4e58ecSGerrit Renker goto drop; 1096ba4e58ecSGerrit Renker } 1097ba4e58ecSGerrit Renker } 1098ba4e58ecSGerrit Renker 1099759e5d00SHerbert Xu if (sk->sk_filter) { 1100759e5d00SHerbert Xu if (udp_lib_checksum_complete(skb)) 1101ba4e58ecSGerrit Renker goto drop; 11021da177e4SLinus Torvalds } 11031da177e4SLinus Torvalds 110481aa646cSMartin Bligh if ((rc = sock_queue_rcv_skb(sk,skb)) < 0) { 110581aa646cSMartin Bligh /* Note that an ENOMEM error is charged twice */ 110681aa646cSMartin Bligh if (rc == -ENOMEM) 1107ba4e58ecSGerrit Renker UDP_INC_STATS_BH(UDP_MIB_RCVBUFERRORS, up->pcflag); 1108ba4e58ecSGerrit Renker goto drop; 1109ba4e58ecSGerrit Renker } 1110ba4e58ecSGerrit Renker 1111ba4e58ecSGerrit Renker UDP_INC_STATS_BH(UDP_MIB_INDATAGRAMS, up->pcflag); 1112ba4e58ecSGerrit Renker return 0; 1113ba4e58ecSGerrit Renker 1114ba4e58ecSGerrit Renker drop: 1115ba4e58ecSGerrit Renker UDP_INC_STATS_BH(UDP_MIB_INERRORS, up->pcflag); 11161da177e4SLinus Torvalds kfree_skb(skb); 11171da177e4SLinus Torvalds return -1; 11181da177e4SLinus Torvalds } 11191da177e4SLinus Torvalds 11201da177e4SLinus Torvalds /* 11211da177e4SLinus Torvalds * Multicasts and broadcasts go to each listener. 11221da177e4SLinus Torvalds * 11231da177e4SLinus Torvalds * Note: called only from the BH handler context, 11241da177e4SLinus Torvalds * so we don't need to lock the hashes. 11251da177e4SLinus Torvalds */ 1126ba4e58ecSGerrit Renker static int __udp4_lib_mcast_deliver(struct sk_buff *skb, 1127ba4e58ecSGerrit Renker struct udphdr *uh, 1128ba4e58ecSGerrit Renker __be32 saddr, __be32 daddr, 1129ba4e58ecSGerrit Renker struct hlist_head udptable[]) 11301da177e4SLinus Torvalds { 11311da177e4SLinus Torvalds struct sock *sk; 11321da177e4SLinus Torvalds int dif; 11331da177e4SLinus Torvalds 11341da177e4SLinus Torvalds read_lock(&udp_hash_lock); 1135ba4e58ecSGerrit Renker sk = sk_head(&udptable[ntohs(uh->dest) & (UDP_HTABLE_SIZE - 1)]); 11361da177e4SLinus Torvalds dif = skb->dev->ifindex; 11371da177e4SLinus Torvalds sk = udp_v4_mcast_next(sk, uh->dest, daddr, uh->source, saddr, dif); 11381da177e4SLinus Torvalds if (sk) { 11391da177e4SLinus Torvalds struct sock *sknext = NULL; 11401da177e4SLinus Torvalds 11411da177e4SLinus Torvalds do { 11421da177e4SLinus Torvalds struct sk_buff *skb1 = skb; 11431da177e4SLinus Torvalds 11441da177e4SLinus Torvalds sknext = udp_v4_mcast_next(sk_next(sk), uh->dest, daddr, 11451da177e4SLinus Torvalds uh->source, saddr, dif); 11461da177e4SLinus Torvalds if (sknext) 11471da177e4SLinus Torvalds skb1 = skb_clone(skb, GFP_ATOMIC); 11481da177e4SLinus Torvalds 11491da177e4SLinus Torvalds if (skb1) { 11501da177e4SLinus Torvalds int ret = udp_queue_rcv_skb(sk, skb1); 11511da177e4SLinus Torvalds if (ret > 0) 11521da177e4SLinus Torvalds /* we should probably re-process instead 11531da177e4SLinus Torvalds * of dropping packets here. */ 11541da177e4SLinus Torvalds kfree_skb(skb1); 11551da177e4SLinus Torvalds } 11561da177e4SLinus Torvalds sk = sknext; 11571da177e4SLinus Torvalds } while (sknext); 11581da177e4SLinus Torvalds } else 11591da177e4SLinus Torvalds kfree_skb(skb); 11601da177e4SLinus Torvalds read_unlock(&udp_hash_lock); 11611da177e4SLinus Torvalds return 0; 11621da177e4SLinus Torvalds } 11631da177e4SLinus Torvalds 11641da177e4SLinus Torvalds /* Initialize UDP checksum. If exited with zero value (success), 11651da177e4SLinus Torvalds * CHECKSUM_UNNECESSARY means, that no more checks are required. 11661da177e4SLinus Torvalds * Otherwise, csum completion requires chacksumming packet body, 11671da177e4SLinus Torvalds * including udp header and folding it to skb->csum. 11681da177e4SLinus Torvalds */ 1169759e5d00SHerbert Xu static inline int udp4_csum_init(struct sk_buff *skb, struct udphdr *uh, 1170759e5d00SHerbert Xu int proto) 11711da177e4SLinus Torvalds { 1172eddc9ec5SArnaldo Carvalho de Melo const struct iphdr *iph; 1173759e5d00SHerbert Xu int err; 1174759e5d00SHerbert Xu 1175759e5d00SHerbert Xu UDP_SKB_CB(skb)->partial_cov = 0; 1176759e5d00SHerbert Xu UDP_SKB_CB(skb)->cscov = skb->len; 1177759e5d00SHerbert Xu 1178759e5d00SHerbert Xu if (proto == IPPROTO_UDPLITE) { 1179759e5d00SHerbert Xu err = udplite_checksum_init(skb, uh); 1180759e5d00SHerbert Xu if (err) 1181759e5d00SHerbert Xu return err; 1182759e5d00SHerbert Xu } 1183759e5d00SHerbert Xu 1184eddc9ec5SArnaldo Carvalho de Melo iph = ip_hdr(skb); 11851da177e4SLinus Torvalds if (uh->check == 0) { 11861da177e4SLinus Torvalds skb->ip_summed = CHECKSUM_UNNECESSARY; 118784fa7933SPatrick McHardy } else if (skb->ip_summed == CHECKSUM_COMPLETE) { 1188eddc9ec5SArnaldo Carvalho de Melo if (!csum_tcpudp_magic(iph->saddr, iph->daddr, skb->len, 1189eddc9ec5SArnaldo Carvalho de Melo proto, skb->csum)) 1190fb286bb2SHerbert Xu skb->ip_summed = CHECKSUM_UNNECESSARY; 11911da177e4SLinus Torvalds } 11921da177e4SLinus Torvalds if (skb->ip_summed != CHECKSUM_UNNECESSARY) 1193eddc9ec5SArnaldo Carvalho de Melo skb->csum = csum_tcpudp_nofold(iph->saddr, iph->daddr, 1194759e5d00SHerbert Xu skb->len, proto, 0); 11951da177e4SLinus Torvalds /* Probably, we should checksum udp header (it should be in cache 11961da177e4SLinus Torvalds * in any case) and data in tiny packets (< rx copybreak). 11971da177e4SLinus Torvalds */ 1198ba4e58ecSGerrit Renker 1199759e5d00SHerbert Xu return 0; 12001da177e4SLinus Torvalds } 12011da177e4SLinus Torvalds 12021da177e4SLinus Torvalds /* 12031da177e4SLinus Torvalds * All we need to do is get the socket, and then do a checksum. 12041da177e4SLinus Torvalds */ 12051da177e4SLinus Torvalds 1206ba4e58ecSGerrit Renker int __udp4_lib_rcv(struct sk_buff *skb, struct hlist_head udptable[], 1207759e5d00SHerbert Xu int proto) 12081da177e4SLinus Torvalds { 12091da177e4SLinus Torvalds struct sock *sk; 1210*4bedb452SArnaldo Carvalho de Melo struct udphdr *uh = udp_hdr(skb); 12111da177e4SLinus Torvalds unsigned short ulen; 12121da177e4SLinus Torvalds struct rtable *rt = (struct rtable*)skb->dst; 1213eddc9ec5SArnaldo Carvalho de Melo __be32 saddr = ip_hdr(skb)->saddr; 1214eddc9ec5SArnaldo Carvalho de Melo __be32 daddr = ip_hdr(skb)->daddr; 12151da177e4SLinus Torvalds 12161da177e4SLinus Torvalds /* 1217ba4e58ecSGerrit Renker * Validate the packet. 12181da177e4SLinus Torvalds */ 12191da177e4SLinus Torvalds if (!pskb_may_pull(skb, sizeof(struct udphdr))) 1220ba4e58ecSGerrit Renker goto drop; /* No space for header. */ 12211da177e4SLinus Torvalds 12221da177e4SLinus Torvalds ulen = ntohs(uh->len); 1223ba4e58ecSGerrit Renker if (ulen > skb->len) 12241da177e4SLinus Torvalds goto short_packet; 12251da177e4SLinus Torvalds 1226759e5d00SHerbert Xu if (proto == IPPROTO_UDP) { 1227759e5d00SHerbert Xu /* UDP validates ulen. */ 1228ba4e58ecSGerrit Renker if (ulen < sizeof(*uh) || pskb_trim_rcsum(skb, ulen)) 12291da177e4SLinus Torvalds goto short_packet; 1230*4bedb452SArnaldo Carvalho de Melo uh = udp_hdr(skb); 1231ba4e58ecSGerrit Renker } 12321da177e4SLinus Torvalds 1233759e5d00SHerbert Xu if (udp4_csum_init(skb, uh, proto)) 1234759e5d00SHerbert Xu goto csum_error; 1235759e5d00SHerbert Xu 12361da177e4SLinus Torvalds if (rt->rt_flags & (RTCF_BROADCAST|RTCF_MULTICAST)) 1237ba4e58ecSGerrit Renker return __udp4_lib_mcast_deliver(skb, uh, saddr, daddr, udptable); 12381da177e4SLinus Torvalds 1239ba4e58ecSGerrit Renker sk = __udp4_lib_lookup(saddr, uh->source, daddr, uh->dest, 1240ba4e58ecSGerrit Renker skb->dev->ifindex, udptable ); 12411da177e4SLinus Torvalds 12421da177e4SLinus Torvalds if (sk != NULL) { 12431da177e4SLinus Torvalds int ret = udp_queue_rcv_skb(sk, skb); 12441da177e4SLinus Torvalds sock_put(sk); 12451da177e4SLinus Torvalds 12461da177e4SLinus Torvalds /* a return value > 0 means to resubmit the input, but 1247ba4e58ecSGerrit Renker * it wants the return to be -protocol, or 0 12481da177e4SLinus Torvalds */ 12491da177e4SLinus Torvalds if (ret > 0) 12501da177e4SLinus Torvalds return -ret; 12511da177e4SLinus Torvalds return 0; 12521da177e4SLinus Torvalds } 12531da177e4SLinus Torvalds 12541da177e4SLinus Torvalds if (!xfrm4_policy_check(NULL, XFRM_POLICY_IN, skb)) 12551da177e4SLinus Torvalds goto drop; 1256b59c2701SPatrick McHardy nf_reset(skb); 12571da177e4SLinus Torvalds 12581da177e4SLinus Torvalds /* No socket. Drop packet silently, if checksum is wrong */ 1259ba4e58ecSGerrit Renker if (udp_lib_checksum_complete(skb)) 12601da177e4SLinus Torvalds goto csum_error; 12611da177e4SLinus Torvalds 1262759e5d00SHerbert Xu UDP_INC_STATS_BH(UDP_MIB_NOPORTS, proto == IPPROTO_UDPLITE); 12631da177e4SLinus Torvalds icmp_send(skb, ICMP_DEST_UNREACH, ICMP_PORT_UNREACH, 0); 12641da177e4SLinus Torvalds 12651da177e4SLinus Torvalds /* 12661da177e4SLinus Torvalds * Hmm. We got an UDP packet to a port to which we 12671da177e4SLinus Torvalds * don't wanna listen. Ignore it. 12681da177e4SLinus Torvalds */ 12691da177e4SLinus Torvalds kfree_skb(skb); 12706516c655SStephen Hemminger return 0; 12711da177e4SLinus Torvalds 12721da177e4SLinus Torvalds short_packet: 1273ba4e58ecSGerrit Renker LIMIT_NETDEBUG(KERN_DEBUG "UDP%s: short packet: From %u.%u.%u.%u:%u %d/%d to %u.%u.%u.%u:%u\n", 1274759e5d00SHerbert Xu proto == IPPROTO_UDPLITE ? "-Lite" : "", 12751da177e4SLinus Torvalds NIPQUAD(saddr), 12761da177e4SLinus Torvalds ntohs(uh->source), 12771da177e4SLinus Torvalds ulen, 1278ba4e58ecSGerrit Renker skb->len, 12791da177e4SLinus Torvalds NIPQUAD(daddr), 128064ce2073SPatrick McHardy ntohs(uh->dest)); 1281ba4e58ecSGerrit Renker goto drop; 12821da177e4SLinus Torvalds 12831da177e4SLinus Torvalds csum_error: 12841da177e4SLinus Torvalds /* 12851da177e4SLinus Torvalds * RFC1122: OK. Discards the bad packet silently (as far as 12861da177e4SLinus Torvalds * the network is concerned, anyway) as per 4.1.3.4 (MUST). 12871da177e4SLinus Torvalds */ 1288ba4e58ecSGerrit Renker LIMIT_NETDEBUG(KERN_DEBUG "UDP%s: bad checksum. From %d.%d.%d.%d:%d to %d.%d.%d.%d:%d ulen %d\n", 1289759e5d00SHerbert Xu proto == IPPROTO_UDPLITE ? "-Lite" : "", 12901da177e4SLinus Torvalds NIPQUAD(saddr), 12911da177e4SLinus Torvalds ntohs(uh->source), 12921da177e4SLinus Torvalds NIPQUAD(daddr), 12931da177e4SLinus Torvalds ntohs(uh->dest), 129464ce2073SPatrick McHardy ulen); 12951da177e4SLinus Torvalds drop: 1296759e5d00SHerbert Xu UDP_INC_STATS_BH(UDP_MIB_INERRORS, proto == IPPROTO_UDPLITE); 12971da177e4SLinus Torvalds kfree_skb(skb); 12986516c655SStephen Hemminger return 0; 12991da177e4SLinus Torvalds } 13001da177e4SLinus Torvalds 13013fbe070aSStephen Hemminger int udp_rcv(struct sk_buff *skb) 1302ba4e58ecSGerrit Renker { 1303759e5d00SHerbert Xu return __udp4_lib_rcv(skb, udp_hash, IPPROTO_UDP); 1304ba4e58ecSGerrit Renker } 1305ba4e58ecSGerrit Renker 1306ba4e58ecSGerrit Renker int udp_destroy_sock(struct sock *sk) 13071da177e4SLinus Torvalds { 13081da177e4SLinus Torvalds lock_sock(sk); 13091da177e4SLinus Torvalds udp_flush_pending_frames(sk); 13101da177e4SLinus Torvalds release_sock(sk); 13111da177e4SLinus Torvalds return 0; 13121da177e4SLinus Torvalds } 13131da177e4SLinus Torvalds 13141da177e4SLinus Torvalds /* 13151da177e4SLinus Torvalds * Socket option code for UDP 13161da177e4SLinus Torvalds */ 13174c0a6cb0SGerrit Renker int udp_lib_setsockopt(struct sock *sk, int level, int optname, 13184c0a6cb0SGerrit Renker char __user *optval, int optlen, 13194c0a6cb0SGerrit Renker int (*push_pending_frames)(struct sock *)) 13201da177e4SLinus Torvalds { 13211da177e4SLinus Torvalds struct udp_sock *up = udp_sk(sk); 13221da177e4SLinus Torvalds int val; 13231da177e4SLinus Torvalds int err = 0; 13241da177e4SLinus Torvalds 13251da177e4SLinus Torvalds if (optlen<sizeof(int)) 13261da177e4SLinus Torvalds return -EINVAL; 13271da177e4SLinus Torvalds 13281da177e4SLinus Torvalds if (get_user(val, (int __user *)optval)) 13291da177e4SLinus Torvalds return -EFAULT; 13301da177e4SLinus Torvalds 13311da177e4SLinus Torvalds switch (optname) { 13321da177e4SLinus Torvalds case UDP_CORK: 13331da177e4SLinus Torvalds if (val != 0) { 13341da177e4SLinus Torvalds up->corkflag = 1; 13351da177e4SLinus Torvalds } else { 13361da177e4SLinus Torvalds up->corkflag = 0; 13371da177e4SLinus Torvalds lock_sock(sk); 13384c0a6cb0SGerrit Renker (*push_pending_frames)(sk); 13391da177e4SLinus Torvalds release_sock(sk); 13401da177e4SLinus Torvalds } 13411da177e4SLinus Torvalds break; 13421da177e4SLinus Torvalds 13431da177e4SLinus Torvalds case UDP_ENCAP: 13441da177e4SLinus Torvalds switch (val) { 13451da177e4SLinus Torvalds case 0: 13461da177e4SLinus Torvalds case UDP_ENCAP_ESPINUDP: 13471da177e4SLinus Torvalds case UDP_ENCAP_ESPINUDP_NON_IKE: 13481da177e4SLinus Torvalds up->encap_type = val; 13491da177e4SLinus Torvalds break; 13501da177e4SLinus Torvalds default: 13511da177e4SLinus Torvalds err = -ENOPROTOOPT; 13521da177e4SLinus Torvalds break; 13531da177e4SLinus Torvalds } 13541da177e4SLinus Torvalds break; 13551da177e4SLinus Torvalds 1356ba4e58ecSGerrit Renker /* 1357ba4e58ecSGerrit Renker * UDP-Lite's partial checksum coverage (RFC 3828). 1358ba4e58ecSGerrit Renker */ 1359ba4e58ecSGerrit Renker /* The sender sets actual checksum coverage length via this option. 1360ba4e58ecSGerrit Renker * The case coverage > packet length is handled by send module. */ 1361ba4e58ecSGerrit Renker case UDPLITE_SEND_CSCOV: 1362ba4e58ecSGerrit Renker if (!up->pcflag) /* Disable the option on UDP sockets */ 1363ba4e58ecSGerrit Renker return -ENOPROTOOPT; 1364ba4e58ecSGerrit Renker if (val != 0 && val < 8) /* Illegal coverage: use default (8) */ 1365ba4e58ecSGerrit Renker val = 8; 1366ba4e58ecSGerrit Renker up->pcslen = val; 1367ba4e58ecSGerrit Renker up->pcflag |= UDPLITE_SEND_CC; 1368ba4e58ecSGerrit Renker break; 1369ba4e58ecSGerrit Renker 1370ba4e58ecSGerrit Renker /* The receiver specifies a minimum checksum coverage value. To make 1371ba4e58ecSGerrit Renker * sense, this should be set to at least 8 (as done below). If zero is 1372ba4e58ecSGerrit Renker * used, this again means full checksum coverage. */ 1373ba4e58ecSGerrit Renker case UDPLITE_RECV_CSCOV: 1374ba4e58ecSGerrit Renker if (!up->pcflag) /* Disable the option on UDP sockets */ 1375ba4e58ecSGerrit Renker return -ENOPROTOOPT; 1376ba4e58ecSGerrit Renker if (val != 0 && val < 8) /* Avoid silly minimal values. */ 1377ba4e58ecSGerrit Renker val = 8; 1378ba4e58ecSGerrit Renker up->pcrlen = val; 1379ba4e58ecSGerrit Renker up->pcflag |= UDPLITE_RECV_CC; 1380ba4e58ecSGerrit Renker break; 1381ba4e58ecSGerrit Renker 13821da177e4SLinus Torvalds default: 13831da177e4SLinus Torvalds err = -ENOPROTOOPT; 13841da177e4SLinus Torvalds break; 13856516c655SStephen Hemminger } 13861da177e4SLinus Torvalds 13871da177e4SLinus Torvalds return err; 13881da177e4SLinus Torvalds } 13891da177e4SLinus Torvalds 1390ba4e58ecSGerrit Renker int udp_setsockopt(struct sock *sk, int level, int optname, 13913fdadf7dSDmitry Mishin char __user *optval, int optlen) 13923fdadf7dSDmitry Mishin { 1393ba4e58ecSGerrit Renker if (level == SOL_UDP || level == SOL_UDPLITE) 13944c0a6cb0SGerrit Renker return udp_lib_setsockopt(sk, level, optname, optval, optlen, 13954c0a6cb0SGerrit Renker udp_push_pending_frames); 1396ba4e58ecSGerrit Renker return ip_setsockopt(sk, level, optname, optval, optlen); 13973fdadf7dSDmitry Mishin } 13983fdadf7dSDmitry Mishin 13993fdadf7dSDmitry Mishin #ifdef CONFIG_COMPAT 1400ba4e58ecSGerrit Renker int compat_udp_setsockopt(struct sock *sk, int level, int optname, 14013fdadf7dSDmitry Mishin char __user *optval, int optlen) 14023fdadf7dSDmitry Mishin { 1403ba4e58ecSGerrit Renker if (level == SOL_UDP || level == SOL_UDPLITE) 14044c0a6cb0SGerrit Renker return udp_lib_setsockopt(sk, level, optname, optval, optlen, 14054c0a6cb0SGerrit Renker udp_push_pending_frames); 1406ba4e58ecSGerrit Renker return compat_ip_setsockopt(sk, level, optname, optval, optlen); 14073fdadf7dSDmitry Mishin } 14083fdadf7dSDmitry Mishin #endif 14093fdadf7dSDmitry Mishin 14104c0a6cb0SGerrit Renker int udp_lib_getsockopt(struct sock *sk, int level, int optname, 14111da177e4SLinus Torvalds char __user *optval, int __user *optlen) 14121da177e4SLinus Torvalds { 14131da177e4SLinus Torvalds struct udp_sock *up = udp_sk(sk); 14141da177e4SLinus Torvalds int val, len; 14151da177e4SLinus Torvalds 14161da177e4SLinus Torvalds if (get_user(len,optlen)) 14171da177e4SLinus Torvalds return -EFAULT; 14181da177e4SLinus Torvalds 14191da177e4SLinus Torvalds len = min_t(unsigned int, len, sizeof(int)); 14201da177e4SLinus Torvalds 14211da177e4SLinus Torvalds if (len < 0) 14221da177e4SLinus Torvalds return -EINVAL; 14231da177e4SLinus Torvalds 14241da177e4SLinus Torvalds switch (optname) { 14251da177e4SLinus Torvalds case UDP_CORK: 14261da177e4SLinus Torvalds val = up->corkflag; 14271da177e4SLinus Torvalds break; 14281da177e4SLinus Torvalds 14291da177e4SLinus Torvalds case UDP_ENCAP: 14301da177e4SLinus Torvalds val = up->encap_type; 14311da177e4SLinus Torvalds break; 14321da177e4SLinus Torvalds 1433ba4e58ecSGerrit Renker /* The following two cannot be changed on UDP sockets, the return is 1434ba4e58ecSGerrit Renker * always 0 (which corresponds to the full checksum coverage of UDP). */ 1435ba4e58ecSGerrit Renker case UDPLITE_SEND_CSCOV: 1436ba4e58ecSGerrit Renker val = up->pcslen; 1437ba4e58ecSGerrit Renker break; 1438ba4e58ecSGerrit Renker 1439ba4e58ecSGerrit Renker case UDPLITE_RECV_CSCOV: 1440ba4e58ecSGerrit Renker val = up->pcrlen; 1441ba4e58ecSGerrit Renker break; 1442ba4e58ecSGerrit Renker 14431da177e4SLinus Torvalds default: 14441da177e4SLinus Torvalds return -ENOPROTOOPT; 14456516c655SStephen Hemminger } 14461da177e4SLinus Torvalds 14471da177e4SLinus Torvalds if (put_user(len, optlen)) 14481da177e4SLinus Torvalds return -EFAULT; 14491da177e4SLinus Torvalds if (copy_to_user(optval, &val,len)) 14501da177e4SLinus Torvalds return -EFAULT; 14511da177e4SLinus Torvalds return 0; 14521da177e4SLinus Torvalds } 14531da177e4SLinus Torvalds 1454ba4e58ecSGerrit Renker int udp_getsockopt(struct sock *sk, int level, int optname, 14553fdadf7dSDmitry Mishin char __user *optval, int __user *optlen) 14563fdadf7dSDmitry Mishin { 1457ba4e58ecSGerrit Renker if (level == SOL_UDP || level == SOL_UDPLITE) 14584c0a6cb0SGerrit Renker return udp_lib_getsockopt(sk, level, optname, optval, optlen); 1459ba4e58ecSGerrit Renker return ip_getsockopt(sk, level, optname, optval, optlen); 14603fdadf7dSDmitry Mishin } 14613fdadf7dSDmitry Mishin 14623fdadf7dSDmitry Mishin #ifdef CONFIG_COMPAT 1463ba4e58ecSGerrit Renker int compat_udp_getsockopt(struct sock *sk, int level, int optname, 14643fdadf7dSDmitry Mishin char __user *optval, int __user *optlen) 14653fdadf7dSDmitry Mishin { 1466ba4e58ecSGerrit Renker if (level == SOL_UDP || level == SOL_UDPLITE) 14674c0a6cb0SGerrit Renker return udp_lib_getsockopt(sk, level, optname, optval, optlen); 1468ba4e58ecSGerrit Renker return compat_ip_getsockopt(sk, level, optname, optval, optlen); 14693fdadf7dSDmitry Mishin } 14703fdadf7dSDmitry Mishin #endif 14711da177e4SLinus Torvalds /** 14721da177e4SLinus Torvalds * udp_poll - wait for a UDP event. 14731da177e4SLinus Torvalds * @file - file struct 14741da177e4SLinus Torvalds * @sock - socket 14751da177e4SLinus Torvalds * @wait - poll table 14761da177e4SLinus Torvalds * 14771da177e4SLinus Torvalds * This is same as datagram poll, except for the special case of 14781da177e4SLinus Torvalds * blocking sockets. If application is using a blocking fd 14791da177e4SLinus Torvalds * and a packet with checksum error is in the queue; 14801da177e4SLinus Torvalds * then it could get return from select indicating data available 14811da177e4SLinus Torvalds * but then block when reading it. Add special case code 14821da177e4SLinus Torvalds * to work around these arguably broken applications. 14831da177e4SLinus Torvalds */ 14841da177e4SLinus Torvalds unsigned int udp_poll(struct file *file, struct socket *sock, poll_table *wait) 14851da177e4SLinus Torvalds { 14861da177e4SLinus Torvalds unsigned int mask = datagram_poll(file, sock, wait); 14871da177e4SLinus Torvalds struct sock *sk = sock->sk; 1488ba4e58ecSGerrit Renker int is_lite = IS_UDPLITE(sk); 14891da177e4SLinus Torvalds 14901da177e4SLinus Torvalds /* Check for false positives due to checksum errors */ 14911da177e4SLinus Torvalds if ( (mask & POLLRDNORM) && 14921da177e4SLinus Torvalds !(file->f_flags & O_NONBLOCK) && 14931da177e4SLinus Torvalds !(sk->sk_shutdown & RCV_SHUTDOWN)){ 14941da177e4SLinus Torvalds struct sk_buff_head *rcvq = &sk->sk_receive_queue; 14951da177e4SLinus Torvalds struct sk_buff *skb; 14961da177e4SLinus Torvalds 1497208d8984SHerbert Xu spin_lock_bh(&rcvq->lock); 1498759e5d00SHerbert Xu while ((skb = skb_peek(rcvq)) != NULL && 1499759e5d00SHerbert Xu udp_lib_checksum_complete(skb)) { 1500ba4e58ecSGerrit Renker UDP_INC_STATS_BH(UDP_MIB_INERRORS, is_lite); 15011da177e4SLinus Torvalds __skb_unlink(skb, rcvq); 15021da177e4SLinus Torvalds kfree_skb(skb); 15031da177e4SLinus Torvalds } 1504208d8984SHerbert Xu spin_unlock_bh(&rcvq->lock); 15051da177e4SLinus Torvalds 15061da177e4SLinus Torvalds /* nothing to see, move along */ 15071da177e4SLinus Torvalds if (skb == NULL) 15081da177e4SLinus Torvalds mask &= ~(POLLIN | POLLRDNORM); 15091da177e4SLinus Torvalds } 15101da177e4SLinus Torvalds 15111da177e4SLinus Torvalds return mask; 15121da177e4SLinus Torvalds 15131da177e4SLinus Torvalds } 15141da177e4SLinus Torvalds 15151da177e4SLinus Torvalds struct proto udp_prot = { 15161da177e4SLinus Torvalds .name = "UDP", 15171da177e4SLinus Torvalds .owner = THIS_MODULE, 1518ba4e58ecSGerrit Renker .close = udp_lib_close, 15191da177e4SLinus Torvalds .connect = ip4_datagram_connect, 15201da177e4SLinus Torvalds .disconnect = udp_disconnect, 15211da177e4SLinus Torvalds .ioctl = udp_ioctl, 15221da177e4SLinus Torvalds .destroy = udp_destroy_sock, 15231da177e4SLinus Torvalds .setsockopt = udp_setsockopt, 15241da177e4SLinus Torvalds .getsockopt = udp_getsockopt, 15251da177e4SLinus Torvalds .sendmsg = udp_sendmsg, 15261da177e4SLinus Torvalds .recvmsg = udp_recvmsg, 15271da177e4SLinus Torvalds .sendpage = udp_sendpage, 15281da177e4SLinus Torvalds .backlog_rcv = udp_queue_rcv_skb, 1529ba4e58ecSGerrit Renker .hash = udp_lib_hash, 1530ba4e58ecSGerrit Renker .unhash = udp_lib_unhash, 15311da177e4SLinus Torvalds .get_port = udp_v4_get_port, 15321da177e4SLinus Torvalds .obj_size = sizeof(struct udp_sock), 1533543d9cfeSArnaldo Carvalho de Melo #ifdef CONFIG_COMPAT 1534543d9cfeSArnaldo Carvalho de Melo .compat_setsockopt = compat_udp_setsockopt, 1535543d9cfeSArnaldo Carvalho de Melo .compat_getsockopt = compat_udp_getsockopt, 1536543d9cfeSArnaldo Carvalho de Melo #endif 15371da177e4SLinus Torvalds }; 15381da177e4SLinus Torvalds 15391da177e4SLinus Torvalds /* ------------------------------------------------------------------------ */ 15401da177e4SLinus Torvalds #ifdef CONFIG_PROC_FS 15411da177e4SLinus Torvalds 15421da177e4SLinus Torvalds static struct sock *udp_get_first(struct seq_file *seq) 15431da177e4SLinus Torvalds { 15441da177e4SLinus Torvalds struct sock *sk; 15451da177e4SLinus Torvalds struct udp_iter_state *state = seq->private; 15461da177e4SLinus Torvalds 15471da177e4SLinus Torvalds for (state->bucket = 0; state->bucket < UDP_HTABLE_SIZE; ++state->bucket) { 15481da177e4SLinus Torvalds struct hlist_node *node; 1549ba4e58ecSGerrit Renker sk_for_each(sk, node, state->hashtable + state->bucket) { 15501da177e4SLinus Torvalds if (sk->sk_family == state->family) 15511da177e4SLinus Torvalds goto found; 15521da177e4SLinus Torvalds } 15531da177e4SLinus Torvalds } 15541da177e4SLinus Torvalds sk = NULL; 15551da177e4SLinus Torvalds found: 15561da177e4SLinus Torvalds return sk; 15571da177e4SLinus Torvalds } 15581da177e4SLinus Torvalds 15591da177e4SLinus Torvalds static struct sock *udp_get_next(struct seq_file *seq, struct sock *sk) 15601da177e4SLinus Torvalds { 15611da177e4SLinus Torvalds struct udp_iter_state *state = seq->private; 15621da177e4SLinus Torvalds 15631da177e4SLinus Torvalds do { 15641da177e4SLinus Torvalds sk = sk_next(sk); 15651da177e4SLinus Torvalds try_again: 15661da177e4SLinus Torvalds ; 15671da177e4SLinus Torvalds } while (sk && sk->sk_family != state->family); 15681da177e4SLinus Torvalds 15691da177e4SLinus Torvalds if (!sk && ++state->bucket < UDP_HTABLE_SIZE) { 1570ba4e58ecSGerrit Renker sk = sk_head(state->hashtable + state->bucket); 15711da177e4SLinus Torvalds goto try_again; 15721da177e4SLinus Torvalds } 15731da177e4SLinus Torvalds return sk; 15741da177e4SLinus Torvalds } 15751da177e4SLinus Torvalds 15761da177e4SLinus Torvalds static struct sock *udp_get_idx(struct seq_file *seq, loff_t pos) 15771da177e4SLinus Torvalds { 15781da177e4SLinus Torvalds struct sock *sk = udp_get_first(seq); 15791da177e4SLinus Torvalds 15801da177e4SLinus Torvalds if (sk) 15811da177e4SLinus Torvalds while (pos && (sk = udp_get_next(seq, sk)) != NULL) 15821da177e4SLinus Torvalds --pos; 15831da177e4SLinus Torvalds return pos ? NULL : sk; 15841da177e4SLinus Torvalds } 15851da177e4SLinus Torvalds 15861da177e4SLinus Torvalds static void *udp_seq_start(struct seq_file *seq, loff_t *pos) 15871da177e4SLinus Torvalds { 15881da177e4SLinus Torvalds read_lock(&udp_hash_lock); 15891da177e4SLinus Torvalds return *pos ? udp_get_idx(seq, *pos-1) : (void *)1; 15901da177e4SLinus Torvalds } 15911da177e4SLinus Torvalds 15921da177e4SLinus Torvalds static void *udp_seq_next(struct seq_file *seq, void *v, loff_t *pos) 15931da177e4SLinus Torvalds { 15941da177e4SLinus Torvalds struct sock *sk; 15951da177e4SLinus Torvalds 15961da177e4SLinus Torvalds if (v == (void *)1) 15971da177e4SLinus Torvalds sk = udp_get_idx(seq, 0); 15981da177e4SLinus Torvalds else 15991da177e4SLinus Torvalds sk = udp_get_next(seq, v); 16001da177e4SLinus Torvalds 16011da177e4SLinus Torvalds ++*pos; 16021da177e4SLinus Torvalds return sk; 16031da177e4SLinus Torvalds } 16041da177e4SLinus Torvalds 16051da177e4SLinus Torvalds static void udp_seq_stop(struct seq_file *seq, void *v) 16061da177e4SLinus Torvalds { 16071da177e4SLinus Torvalds read_unlock(&udp_hash_lock); 16081da177e4SLinus Torvalds } 16091da177e4SLinus Torvalds 16101da177e4SLinus Torvalds static int udp_seq_open(struct inode *inode, struct file *file) 16111da177e4SLinus Torvalds { 16121da177e4SLinus Torvalds struct udp_seq_afinfo *afinfo = PDE(inode)->data; 16131da177e4SLinus Torvalds struct seq_file *seq; 16141da177e4SLinus Torvalds int rc = -ENOMEM; 16150da974f4SPanagiotis Issaris struct udp_iter_state *s = kzalloc(sizeof(*s), GFP_KERNEL); 16161da177e4SLinus Torvalds 16171da177e4SLinus Torvalds if (!s) 16181da177e4SLinus Torvalds goto out; 16191da177e4SLinus Torvalds s->family = afinfo->family; 1620ba4e58ecSGerrit Renker s->hashtable = afinfo->hashtable; 16211da177e4SLinus Torvalds s->seq_ops.start = udp_seq_start; 16221da177e4SLinus Torvalds s->seq_ops.next = udp_seq_next; 16231da177e4SLinus Torvalds s->seq_ops.show = afinfo->seq_show; 16241da177e4SLinus Torvalds s->seq_ops.stop = udp_seq_stop; 16251da177e4SLinus Torvalds 16261da177e4SLinus Torvalds rc = seq_open(file, &s->seq_ops); 16271da177e4SLinus Torvalds if (rc) 16281da177e4SLinus Torvalds goto out_kfree; 16291da177e4SLinus Torvalds 16301da177e4SLinus Torvalds seq = file->private_data; 16311da177e4SLinus Torvalds seq->private = s; 16321da177e4SLinus Torvalds out: 16331da177e4SLinus Torvalds return rc; 16341da177e4SLinus Torvalds out_kfree: 16351da177e4SLinus Torvalds kfree(s); 16361da177e4SLinus Torvalds goto out; 16371da177e4SLinus Torvalds } 16381da177e4SLinus Torvalds 16391da177e4SLinus Torvalds /* ------------------------------------------------------------------------ */ 16401da177e4SLinus Torvalds int udp_proc_register(struct udp_seq_afinfo *afinfo) 16411da177e4SLinus Torvalds { 16421da177e4SLinus Torvalds struct proc_dir_entry *p; 16431da177e4SLinus Torvalds int rc = 0; 16441da177e4SLinus Torvalds 16451da177e4SLinus Torvalds if (!afinfo) 16461da177e4SLinus Torvalds return -EINVAL; 16471da177e4SLinus Torvalds afinfo->seq_fops->owner = afinfo->owner; 16481da177e4SLinus Torvalds afinfo->seq_fops->open = udp_seq_open; 16491da177e4SLinus Torvalds afinfo->seq_fops->read = seq_read; 16501da177e4SLinus Torvalds afinfo->seq_fops->llseek = seq_lseek; 16511da177e4SLinus Torvalds afinfo->seq_fops->release = seq_release_private; 16521da177e4SLinus Torvalds 16531da177e4SLinus Torvalds p = proc_net_fops_create(afinfo->name, S_IRUGO, afinfo->seq_fops); 16541da177e4SLinus Torvalds if (p) 16551da177e4SLinus Torvalds p->data = afinfo; 16561da177e4SLinus Torvalds else 16571da177e4SLinus Torvalds rc = -ENOMEM; 16581da177e4SLinus Torvalds return rc; 16591da177e4SLinus Torvalds } 16601da177e4SLinus Torvalds 16611da177e4SLinus Torvalds void udp_proc_unregister(struct udp_seq_afinfo *afinfo) 16621da177e4SLinus Torvalds { 16631da177e4SLinus Torvalds if (!afinfo) 16641da177e4SLinus Torvalds return; 16651da177e4SLinus Torvalds proc_net_remove(afinfo->name); 16661da177e4SLinus Torvalds memset(afinfo->seq_fops, 0, sizeof(*afinfo->seq_fops)); 16671da177e4SLinus Torvalds } 16681da177e4SLinus Torvalds 16691da177e4SLinus Torvalds /* ------------------------------------------------------------------------ */ 16701da177e4SLinus Torvalds static void udp4_format_sock(struct sock *sp, char *tmpbuf, int bucket) 16711da177e4SLinus Torvalds { 16721da177e4SLinus Torvalds struct inet_sock *inet = inet_sk(sp); 1673734ab87fSAl Viro __be32 dest = inet->daddr; 1674734ab87fSAl Viro __be32 src = inet->rcv_saddr; 16751da177e4SLinus Torvalds __u16 destp = ntohs(inet->dport); 16761da177e4SLinus Torvalds __u16 srcp = ntohs(inet->sport); 16771da177e4SLinus Torvalds 16781da177e4SLinus Torvalds sprintf(tmpbuf, "%4d: %08X:%04X %08X:%04X" 16791da177e4SLinus Torvalds " %02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %p", 16801da177e4SLinus Torvalds bucket, src, srcp, dest, destp, sp->sk_state, 16811da177e4SLinus Torvalds atomic_read(&sp->sk_wmem_alloc), 16821da177e4SLinus Torvalds atomic_read(&sp->sk_rmem_alloc), 16831da177e4SLinus Torvalds 0, 0L, 0, sock_i_uid(sp), 0, sock_i_ino(sp), 16841da177e4SLinus Torvalds atomic_read(&sp->sk_refcnt), sp); 16851da177e4SLinus Torvalds } 16861da177e4SLinus Torvalds 1687ba4e58ecSGerrit Renker int udp4_seq_show(struct seq_file *seq, void *v) 16881da177e4SLinus Torvalds { 16891da177e4SLinus Torvalds if (v == SEQ_START_TOKEN) 16901da177e4SLinus Torvalds seq_printf(seq, "%-127s\n", 16911da177e4SLinus Torvalds " sl local_address rem_address st tx_queue " 16921da177e4SLinus Torvalds "rx_queue tr tm->when retrnsmt uid timeout " 16931da177e4SLinus Torvalds "inode"); 16941da177e4SLinus Torvalds else { 16951da177e4SLinus Torvalds char tmpbuf[129]; 16961da177e4SLinus Torvalds struct udp_iter_state *state = seq->private; 16971da177e4SLinus Torvalds 16981da177e4SLinus Torvalds udp4_format_sock(v, tmpbuf, state->bucket); 16991da177e4SLinus Torvalds seq_printf(seq, "%-127s\n", tmpbuf); 17001da177e4SLinus Torvalds } 17011da177e4SLinus Torvalds return 0; 17021da177e4SLinus Torvalds } 17031da177e4SLinus Torvalds 17041da177e4SLinus Torvalds /* ------------------------------------------------------------------------ */ 17051da177e4SLinus Torvalds static struct file_operations udp4_seq_fops; 17061da177e4SLinus Torvalds static struct udp_seq_afinfo udp4_seq_afinfo = { 17071da177e4SLinus Torvalds .owner = THIS_MODULE, 17081da177e4SLinus Torvalds .name = "udp", 17091da177e4SLinus Torvalds .family = AF_INET, 1710ba4e58ecSGerrit Renker .hashtable = udp_hash, 17111da177e4SLinus Torvalds .seq_show = udp4_seq_show, 17121da177e4SLinus Torvalds .seq_fops = &udp4_seq_fops, 17131da177e4SLinus Torvalds }; 17141da177e4SLinus Torvalds 17151da177e4SLinus Torvalds int __init udp4_proc_init(void) 17161da177e4SLinus Torvalds { 17171da177e4SLinus Torvalds return udp_proc_register(&udp4_seq_afinfo); 17181da177e4SLinus Torvalds } 17191da177e4SLinus Torvalds 17201da177e4SLinus Torvalds void udp4_proc_exit(void) 17211da177e4SLinus Torvalds { 17221da177e4SLinus Torvalds udp_proc_unregister(&udp4_seq_afinfo); 17231da177e4SLinus Torvalds } 17241da177e4SLinus Torvalds #endif /* CONFIG_PROC_FS */ 17251da177e4SLinus Torvalds 17261da177e4SLinus Torvalds EXPORT_SYMBOL(udp_disconnect); 17271da177e4SLinus Torvalds EXPORT_SYMBOL(udp_hash); 17281da177e4SLinus Torvalds EXPORT_SYMBOL(udp_hash_lock); 17291da177e4SLinus Torvalds EXPORT_SYMBOL(udp_ioctl); 173025030a7fSGerrit Renker EXPORT_SYMBOL(udp_get_port); 17311da177e4SLinus Torvalds EXPORT_SYMBOL(udp_prot); 17321da177e4SLinus Torvalds EXPORT_SYMBOL(udp_sendmsg); 17334c0a6cb0SGerrit Renker EXPORT_SYMBOL(udp_lib_getsockopt); 17344c0a6cb0SGerrit Renker EXPORT_SYMBOL(udp_lib_setsockopt); 17351da177e4SLinus Torvalds EXPORT_SYMBOL(udp_poll); 17361da177e4SLinus Torvalds 17371da177e4SLinus Torvalds #ifdef CONFIG_PROC_FS 17381da177e4SLinus Torvalds EXPORT_SYMBOL(udp_proc_register); 17391da177e4SLinus Torvalds EXPORT_SYMBOL(udp_proc_unregister); 17401da177e4SLinus Torvalds #endif 1741