1db8dac20SDavid S. Miller /* 2db8dac20SDavid S. Miller * UDP over IPv6 3db8dac20SDavid S. Miller * Linux INET6 implementation 4db8dac20SDavid S. Miller * 5db8dac20SDavid S. Miller * Authors: 6db8dac20SDavid S. Miller * Pedro Roque <roque@di.fc.ul.pt> 7db8dac20SDavid S. Miller * 8db8dac20SDavid S. Miller * Based on linux/ipv4/udp.c 9db8dac20SDavid S. Miller * 10db8dac20SDavid S. Miller * Fixes: 11db8dac20SDavid S. Miller * Hideaki YOSHIFUJI : sin6_scope_id support 12db8dac20SDavid S. Miller * YOSHIFUJI Hideaki @USAGI and: Support IPV6_V6ONLY socket option, which 13db8dac20SDavid S. Miller * Alexey Kuznetsov allow both IPv4 and IPv6 sockets to bind 14db8dac20SDavid S. Miller * a single port at the same time. 15db8dac20SDavid S. Miller * Kazunori MIYAZAWA @USAGI: change process style to use ip6_append_data 16db8dac20SDavid S. Miller * YOSHIFUJI Hideaki @USAGI: convert /proc/net/udp6 to seq_file. 17db8dac20SDavid S. Miller * 18db8dac20SDavid S. Miller * This program is free software; you can redistribute it and/or 19db8dac20SDavid S. Miller * modify it under the terms of the GNU General Public License 20db8dac20SDavid S. Miller * as published by the Free Software Foundation; either version 21db8dac20SDavid S. Miller * 2 of the License, or (at your option) any later version. 22db8dac20SDavid S. Miller */ 23db8dac20SDavid S. Miller 24db8dac20SDavid S. Miller #include <linux/errno.h> 25db8dac20SDavid S. Miller #include <linux/types.h> 26db8dac20SDavid S. Miller #include <linux/socket.h> 27db8dac20SDavid S. Miller #include <linux/sockios.h> 28db8dac20SDavid S. Miller #include <linux/net.h> 29db8dac20SDavid S. Miller #include <linux/in6.h> 30db8dac20SDavid S. Miller #include <linux/netdevice.h> 31db8dac20SDavid S. Miller #include <linux/if_arp.h> 32db8dac20SDavid S. Miller #include <linux/ipv6.h> 33db8dac20SDavid S. Miller #include <linux/icmpv6.h> 34db8dac20SDavid S. Miller #include <linux/init.h> 35db8dac20SDavid S. Miller #include <linux/module.h> 36db8dac20SDavid S. Miller #include <linux/skbuff.h> 375a0e3ad6STejun Heo #include <linux/slab.h> 38db8dac20SDavid S. Miller #include <asm/uaccess.h> 39db8dac20SDavid S. Miller 40db8dac20SDavid S. Miller #include <net/ndisc.h> 41db8dac20SDavid S. Miller #include <net/protocol.h> 42db8dac20SDavid S. Miller #include <net/transp_v6.h> 43db8dac20SDavid S. Miller #include <net/ip6_route.h> 44db8dac20SDavid S. Miller #include <net/raw.h> 45db8dac20SDavid S. Miller #include <net/tcp_states.h> 46db8dac20SDavid S. Miller #include <net/ip6_checksum.h> 47db8dac20SDavid S. Miller #include <net/xfrm.h> 4872289b96STom Herbert #include <net/inet6_hashtables.h> 49076bb0c8SEliezer Tamir #include <net/busy_poll.h> 50e32ea7e7SCraig Gallek #include <net/sock_reuseport.h> 51db8dac20SDavid S. Miller 52db8dac20SDavid S. Miller #include <linux/proc_fs.h> 53db8dac20SDavid S. Miller #include <linux/seq_file.h> 5422911fc5SEric Dumazet #include <trace/events/skb.h> 55db8dac20SDavid S. Miller #include "udp_impl.h" 56db8dac20SDavid S. Miller 576eada011SEric Dumazet static u32 udp6_ehashfn(const struct net *net, 58b50026b5SHannes Frederic Sowa const struct in6_addr *laddr, 59b50026b5SHannes Frederic Sowa const u16 lport, 60b50026b5SHannes Frederic Sowa const struct in6_addr *faddr, 61b50026b5SHannes Frederic Sowa const __be16 fport) 62b50026b5SHannes Frederic Sowa { 631bbdceefSHannes Frederic Sowa static u32 udp6_ehash_secret __read_mostly; 641bbdceefSHannes Frederic Sowa static u32 udp_ipv6_hash_secret __read_mostly; 651bbdceefSHannes Frederic Sowa 661bbdceefSHannes Frederic Sowa u32 lhash, fhash; 671bbdceefSHannes Frederic Sowa 681bbdceefSHannes Frederic Sowa net_get_random_once(&udp6_ehash_secret, 691bbdceefSHannes Frederic Sowa sizeof(udp6_ehash_secret)); 701bbdceefSHannes Frederic Sowa net_get_random_once(&udp_ipv6_hash_secret, 711bbdceefSHannes Frederic Sowa sizeof(udp_ipv6_hash_secret)); 721bbdceefSHannes Frederic Sowa 731bbdceefSHannes Frederic Sowa lhash = (__force u32)laddr->s6_addr32[3]; 741bbdceefSHannes Frederic Sowa fhash = __ipv6_addr_jhash(faddr, udp_ipv6_hash_secret); 751bbdceefSHannes Frederic Sowa 76b50026b5SHannes Frederic Sowa return __inet6_ehashfn(lhash, lport, fhash, fport, 771bbdceefSHannes Frederic Sowa udp_ipv6_hash_secret + net_hash_mix(net)); 78b50026b5SHannes Frederic Sowa } 79b50026b5SHannes Frederic Sowa 80e32ea7e7SCraig Gallek /* match_wildcard == true: IPV6_ADDR_ANY equals to any IPv6 addresses if IPv6 81e32ea7e7SCraig Gallek * only, and any IPv4 addresses if not IPv6 only 82e32ea7e7SCraig Gallek * match_wildcard == false: addresses must be exactly the same, i.e. 83e32ea7e7SCraig Gallek * IPV6_ADDR_ANY only equals to IPV6_ADDR_ANY, 84e32ea7e7SCraig Gallek * and 0.0.0.0 equals to 0.0.0.0 only 85e32ea7e7SCraig Gallek */ 86e32ea7e7SCraig Gallek int ipv6_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2, 87e32ea7e7SCraig Gallek bool match_wildcard) 88b2f5e7cdSVlad Yasevich { 89b2f5e7cdSVlad Yasevich const struct in6_addr *sk2_rcv_saddr6 = inet6_rcv_saddr(sk2); 90b2f5e7cdSVlad Yasevich int sk2_ipv6only = inet_v6_ipv6only(sk2); 91efe4208fSEric Dumazet int addr_type = ipv6_addr_type(&sk->sk_v6_rcv_saddr); 92b2f5e7cdSVlad Yasevich int addr_type2 = sk2_rcv_saddr6 ? ipv6_addr_type(sk2_rcv_saddr6) : IPV6_ADDR_MAPPED; 93b2f5e7cdSVlad Yasevich 94b2f5e7cdSVlad Yasevich /* if both are mapped, treat as IPv4 */ 95e32ea7e7SCraig Gallek if (addr_type == IPV6_ADDR_MAPPED && addr_type2 == IPV6_ADDR_MAPPED) { 96e32ea7e7SCraig Gallek if (!sk2_ipv6only) { 97e32ea7e7SCraig Gallek if (sk->sk_rcv_saddr == sk2->sk_rcv_saddr) 98e32ea7e7SCraig Gallek return 1; 99e32ea7e7SCraig Gallek if (!sk->sk_rcv_saddr || !sk2->sk_rcv_saddr) 100e32ea7e7SCraig Gallek return match_wildcard; 101e32ea7e7SCraig Gallek } 102e32ea7e7SCraig Gallek return 0; 103e32ea7e7SCraig Gallek } 104b2f5e7cdSVlad Yasevich 105e32ea7e7SCraig Gallek if (addr_type == IPV6_ADDR_ANY && addr_type2 == IPV6_ADDR_ANY) 106e32ea7e7SCraig Gallek return 1; 107e32ea7e7SCraig Gallek 108e32ea7e7SCraig Gallek if (addr_type2 == IPV6_ADDR_ANY && match_wildcard && 109b2f5e7cdSVlad Yasevich !(sk2_ipv6only && addr_type == IPV6_ADDR_MAPPED)) 110b2f5e7cdSVlad Yasevich return 1; 111b2f5e7cdSVlad Yasevich 112e32ea7e7SCraig Gallek if (addr_type == IPV6_ADDR_ANY && match_wildcard && 1139fe516baSEric Dumazet !(ipv6_only_sock(sk) && addr_type2 == IPV6_ADDR_MAPPED)) 114b2f5e7cdSVlad Yasevich return 1; 115b2f5e7cdSVlad Yasevich 116b2f5e7cdSVlad Yasevich if (sk2_rcv_saddr6 && 117efe4208fSEric Dumazet ipv6_addr_equal(&sk->sk_v6_rcv_saddr, sk2_rcv_saddr6)) 118b2f5e7cdSVlad Yasevich return 1; 119b2f5e7cdSVlad Yasevich 120b2f5e7cdSVlad Yasevich return 0; 121b2f5e7cdSVlad Yasevich } 122b2f5e7cdSVlad Yasevich 1236eada011SEric Dumazet static u32 udp6_portaddr_hash(const struct net *net, 124d4cada4aSEric Dumazet const struct in6_addr *addr6, 125d4cada4aSEric Dumazet unsigned int port) 126d4cada4aSEric Dumazet { 127d4cada4aSEric Dumazet unsigned int hash, mix = net_hash_mix(net); 128d4cada4aSEric Dumazet 129d4cada4aSEric Dumazet if (ipv6_addr_any(addr6)) 130d4cada4aSEric Dumazet hash = jhash_1word(0, mix); 131856540eeSBrian Haley else if (ipv6_addr_v4mapped(addr6)) 1320eae88f3SEric Dumazet hash = jhash_1word((__force u32)addr6->s6_addr32[3], mix); 133d4cada4aSEric Dumazet else 1340eae88f3SEric Dumazet hash = jhash2((__force u32 *)addr6->s6_addr32, 4, mix); 135d4cada4aSEric Dumazet 136d4cada4aSEric Dumazet return hash ^ port; 137d4cada4aSEric Dumazet } 138d4cada4aSEric Dumazet 1396ba5a3c5SPavel Emelyanov int udp_v6_get_port(struct sock *sk, unsigned short snum) 140db8dac20SDavid S. Miller { 14130fff923SEric Dumazet unsigned int hash2_nulladdr = 14230fff923SEric Dumazet udp6_portaddr_hash(sock_net(sk), &in6addr_any, snum); 14330fff923SEric Dumazet unsigned int hash2_partial = 144efe4208fSEric Dumazet udp6_portaddr_hash(sock_net(sk), &sk->sk_v6_rcv_saddr, 0); 14530fff923SEric Dumazet 146d4cada4aSEric Dumazet /* precompute partial secondary hash */ 14730fff923SEric Dumazet udp_sk(sk)->udp_portaddr_hash = hash2_partial; 14830fff923SEric Dumazet return udp_lib_get_port(sk, snum, ipv6_rcv_saddr_equal, hash2_nulladdr); 149db8dac20SDavid S. Miller } 150db8dac20SDavid S. Miller 151719f8358SEric Dumazet static void udp_v6_rehash(struct sock *sk) 152719f8358SEric Dumazet { 153719f8358SEric Dumazet u16 new_hash = udp6_portaddr_hash(sock_net(sk), 154efe4208fSEric Dumazet &sk->sk_v6_rcv_saddr, 155719f8358SEric Dumazet inet_sk(sk)->inet_num); 156719f8358SEric Dumazet 157719f8358SEric Dumazet udp_lib_rehash(sk, new_hash); 158719f8358SEric Dumazet } 159719f8358SEric Dumazet 160645ca708SEric Dumazet static inline int compute_score(struct sock *sk, struct net *net, 161645ca708SEric Dumazet unsigned short hnum, 16288440ae7SBalazs Scheidler const struct in6_addr *saddr, __be16 sport, 16388440ae7SBalazs Scheidler const struct in6_addr *daddr, __be16 dport, 164645ca708SEric Dumazet int dif) 165db8dac20SDavid S. Miller { 16660c04aecSJoe Perches int score; 16760c04aecSJoe Perches struct inet_sock *inet; 168db8dac20SDavid S. Miller 16960c04aecSJoe Perches if (!net_eq(sock_net(sk), net) || 17060c04aecSJoe Perches udp_sk(sk)->udp_port_hash != hnum || 17160c04aecSJoe Perches sk->sk_family != PF_INET6) 17260c04aecSJoe Perches return -1; 173645ca708SEric Dumazet 174645ca708SEric Dumazet score = 0; 17560c04aecSJoe Perches inet = inet_sk(sk); 17660c04aecSJoe Perches 177c720c7e8SEric Dumazet if (inet->inet_dport) { 178c720c7e8SEric Dumazet if (inet->inet_dport != sport) 179645ca708SEric Dumazet return -1; 180db8dac20SDavid S. Miller score++; 181db8dac20SDavid S. Miller } 18260c04aecSJoe Perches 183efe4208fSEric Dumazet if (!ipv6_addr_any(&sk->sk_v6_rcv_saddr)) { 184efe4208fSEric Dumazet if (!ipv6_addr_equal(&sk->sk_v6_rcv_saddr, daddr)) 185645ca708SEric Dumazet return -1; 186db8dac20SDavid S. Miller score++; 187db8dac20SDavid S. Miller } 18860c04aecSJoe Perches 189efe4208fSEric Dumazet if (!ipv6_addr_any(&sk->sk_v6_daddr)) { 190efe4208fSEric Dumazet if (!ipv6_addr_equal(&sk->sk_v6_daddr, saddr)) 191645ca708SEric Dumazet return -1; 192db8dac20SDavid S. Miller score++; 193db8dac20SDavid S. Miller } 19460c04aecSJoe Perches 195db8dac20SDavid S. Miller if (sk->sk_bound_dev_if) { 196db8dac20SDavid S. Miller if (sk->sk_bound_dev_if != dif) 197645ca708SEric Dumazet return -1; 198db8dac20SDavid S. Miller score++; 199db8dac20SDavid S. Miller } 20060c04aecSJoe Perches 20170da268bSEric Dumazet if (sk->sk_incoming_cpu == raw_smp_processor_id()) 20270da268bSEric Dumazet score++; 20370da268bSEric Dumazet 204645ca708SEric Dumazet return score; 205645ca708SEric Dumazet } 206645ca708SEric Dumazet 207fddc17deSEric Dumazet static inline int compute_score2(struct sock *sk, struct net *net, 208fddc17deSEric Dumazet const struct in6_addr *saddr, __be16 sport, 20960c04aecSJoe Perches const struct in6_addr *daddr, 21060c04aecSJoe Perches unsigned short hnum, int dif) 211fddc17deSEric Dumazet { 21260c04aecSJoe Perches int score; 21360c04aecSJoe Perches struct inet_sock *inet; 214fddc17deSEric Dumazet 21560c04aecSJoe Perches if (!net_eq(sock_net(sk), net) || 21660c04aecSJoe Perches udp_sk(sk)->udp_port_hash != hnum || 21760c04aecSJoe Perches sk->sk_family != PF_INET6) 21860c04aecSJoe Perches return -1; 219fddc17deSEric Dumazet 220efe4208fSEric Dumazet if (!ipv6_addr_equal(&sk->sk_v6_rcv_saddr, daddr)) 221fddc17deSEric Dumazet return -1; 22260c04aecSJoe Perches 223fddc17deSEric Dumazet score = 0; 22460c04aecSJoe Perches inet = inet_sk(sk); 22560c04aecSJoe Perches 226fddc17deSEric Dumazet if (inet->inet_dport) { 227fddc17deSEric Dumazet if (inet->inet_dport != sport) 228fddc17deSEric Dumazet return -1; 229fddc17deSEric Dumazet score++; 230fddc17deSEric Dumazet } 23160c04aecSJoe Perches 232efe4208fSEric Dumazet if (!ipv6_addr_any(&sk->sk_v6_daddr)) { 233efe4208fSEric Dumazet if (!ipv6_addr_equal(&sk->sk_v6_daddr, saddr)) 234fddc17deSEric Dumazet return -1; 235fddc17deSEric Dumazet score++; 236fddc17deSEric Dumazet } 23760c04aecSJoe Perches 238fddc17deSEric Dumazet if (sk->sk_bound_dev_if) { 239fddc17deSEric Dumazet if (sk->sk_bound_dev_if != dif) 240fddc17deSEric Dumazet return -1; 241fddc17deSEric Dumazet score++; 242fddc17deSEric Dumazet } 24360c04aecSJoe Perches 24470da268bSEric Dumazet if (sk->sk_incoming_cpu == raw_smp_processor_id()) 24570da268bSEric Dumazet score++; 24670da268bSEric Dumazet 247fddc17deSEric Dumazet return score; 248fddc17deSEric Dumazet } 249fddc17deSEric Dumazet 250fddc17deSEric Dumazet /* called with read_rcu_lock() */ 251fddc17deSEric Dumazet static struct sock *udp6_lib_lookup2(struct net *net, 252fddc17deSEric Dumazet const struct in6_addr *saddr, __be16 sport, 253fddc17deSEric Dumazet const struct in6_addr *daddr, unsigned int hnum, int dif, 2541134158bSCraig Gallek struct udp_hslot *hslot2, unsigned int slot2, 2551134158bSCraig Gallek struct sk_buff *skb) 256fddc17deSEric Dumazet { 257fddc17deSEric Dumazet struct sock *sk, *result; 258fddc17deSEric Dumazet struct hlist_nulls_node *node; 25972289b96STom Herbert int score, badness, matches = 0, reuseport = 0; 260ed0dfffdSEric Dumazet bool select_ok = true; 26172289b96STom Herbert u32 hash = 0; 262fddc17deSEric Dumazet 263fddc17deSEric Dumazet begin: 264fddc17deSEric Dumazet result = NULL; 265fddc17deSEric Dumazet badness = -1; 266fddc17deSEric Dumazet udp_portaddr_for_each_entry_rcu(sk, node, &hslot2->head) { 267fddc17deSEric Dumazet score = compute_score2(sk, net, saddr, sport, 268fddc17deSEric Dumazet daddr, hnum, dif); 269fddc17deSEric Dumazet if (score > badness) { 270fddc17deSEric Dumazet result = sk; 271fddc17deSEric Dumazet badness = score; 27272289b96STom Herbert reuseport = sk->sk_reuseport; 27372289b96STom Herbert if (reuseport) { 274b50026b5SHannes Frederic Sowa hash = udp6_ehashfn(net, daddr, hnum, 27572289b96STom Herbert saddr, sport); 276ed0dfffdSEric Dumazet if (select_ok) { 277ed0dfffdSEric Dumazet struct sock *sk2; 278ed0dfffdSEric Dumazet 2791134158bSCraig Gallek sk2 = reuseport_select_sock(sk, hash, skb, 2801134158bSCraig Gallek sizeof(struct udphdr)); 281e32ea7e7SCraig Gallek if (sk2) { 282e32ea7e7SCraig Gallek result = sk2; 283ed0dfffdSEric Dumazet select_ok = false; 284e32ea7e7SCraig Gallek goto found; 285e32ea7e7SCraig Gallek } 286ed0dfffdSEric Dumazet } 28772289b96STom Herbert matches = 1; 28870da268bSEric Dumazet } 28972289b96STom Herbert } else if (score == badness && reuseport) { 29072289b96STom Herbert matches++; 2918fc54f68SDaniel Borkmann if (reciprocal_scale(hash, matches) == 0) 29272289b96STom Herbert result = sk; 29372289b96STom Herbert hash = next_pseudo_random32(hash); 294fddc17deSEric Dumazet } 295fddc17deSEric Dumazet } 296fddc17deSEric Dumazet /* 297fddc17deSEric Dumazet * if the nulls value we got at the end of this lookup is 298fddc17deSEric Dumazet * not the expected one, we must restart lookup. 299fddc17deSEric Dumazet * We probably met an item that was moved to another chain. 300fddc17deSEric Dumazet */ 301fddc17deSEric Dumazet if (get_nulls_value(node) != slot2) 302fddc17deSEric Dumazet goto begin; 303fddc17deSEric Dumazet 304fddc17deSEric Dumazet if (result) { 305e32ea7e7SCraig Gallek found: 306c31504dcSEric Dumazet if (unlikely(!atomic_inc_not_zero_hint(&result->sk_refcnt, 2))) 307fddc17deSEric Dumazet result = NULL; 308fddc17deSEric Dumazet else if (unlikely(compute_score2(result, net, saddr, sport, 309fddc17deSEric Dumazet daddr, hnum, dif) < badness)) { 310fddc17deSEric Dumazet sock_put(result); 311fddc17deSEric Dumazet goto begin; 312fddc17deSEric Dumazet } 313fddc17deSEric Dumazet } 314fddc17deSEric Dumazet return result; 315fddc17deSEric Dumazet } 316fddc17deSEric Dumazet 317fce82338SPavel Emelyanov struct sock *__udp6_lib_lookup(struct net *net, 31888440ae7SBalazs Scheidler const struct in6_addr *saddr, __be16 sport, 31988440ae7SBalazs Scheidler const struct in6_addr *daddr, __be16 dport, 320538950a1SCraig Gallek int dif, struct udp_table *udptable, 321538950a1SCraig Gallek struct sk_buff *skb) 322645ca708SEric Dumazet { 323271b72c7SEric Dumazet struct sock *sk, *result; 32488ab1932SEric Dumazet struct hlist_nulls_node *node; 325645ca708SEric Dumazet unsigned short hnum = ntohs(dport); 326fddc17deSEric Dumazet unsigned int hash2, slot2, slot = udp_hashfn(net, hnum, udptable->mask); 327fddc17deSEric Dumazet struct udp_hslot *hslot2, *hslot = &udptable->hash[slot]; 32872289b96STom Herbert int score, badness, matches = 0, reuseport = 0; 329ed0dfffdSEric Dumazet bool select_ok = true; 33072289b96STom Herbert u32 hash = 0; 331645ca708SEric Dumazet 332271b72c7SEric Dumazet rcu_read_lock(); 333fddc17deSEric Dumazet if (hslot->count > 10) { 334fddc17deSEric Dumazet hash2 = udp6_portaddr_hash(net, daddr, hnum); 335fddc17deSEric Dumazet slot2 = hash2 & udptable->mask; 336fddc17deSEric Dumazet hslot2 = &udptable->hash2[slot2]; 337fddc17deSEric Dumazet if (hslot->count < hslot2->count) 338fddc17deSEric Dumazet goto begin; 339fddc17deSEric Dumazet 340fddc17deSEric Dumazet result = udp6_lib_lookup2(net, saddr, sport, 341fddc17deSEric Dumazet daddr, hnum, dif, 3421134158bSCraig Gallek hslot2, slot2, skb); 343fddc17deSEric Dumazet if (!result) { 344fddc17deSEric Dumazet hash2 = udp6_portaddr_hash(net, &in6addr_any, hnum); 345fddc17deSEric Dumazet slot2 = hash2 & udptable->mask; 346fddc17deSEric Dumazet hslot2 = &udptable->hash2[slot2]; 347fddc17deSEric Dumazet if (hslot->count < hslot2->count) 348fddc17deSEric Dumazet goto begin; 349fddc17deSEric Dumazet 3501223c67cSJorge Boncompte [DTI2] result = udp6_lib_lookup2(net, saddr, sport, 3511223c67cSJorge Boncompte [DTI2] &in6addr_any, hnum, dif, 3521134158bSCraig Gallek hslot2, slot2, skb); 353fddc17deSEric Dumazet } 354fddc17deSEric Dumazet rcu_read_unlock(); 355fddc17deSEric Dumazet return result; 356fddc17deSEric Dumazet } 357271b72c7SEric Dumazet begin: 358271b72c7SEric Dumazet result = NULL; 359271b72c7SEric Dumazet badness = -1; 36088ab1932SEric Dumazet sk_nulls_for_each_rcu(sk, node, &hslot->head) { 361645ca708SEric Dumazet score = compute_score(sk, net, hnum, saddr, sport, daddr, dport, dif); 362645ca708SEric Dumazet if (score > badness) { 363db8dac20SDavid S. Miller result = sk; 364db8dac20SDavid S. Miller badness = score; 36572289b96STom Herbert reuseport = sk->sk_reuseport; 36672289b96STom Herbert if (reuseport) { 367b50026b5SHannes Frederic Sowa hash = udp6_ehashfn(net, daddr, hnum, 36872289b96STom Herbert saddr, sport); 369ed0dfffdSEric Dumazet if (select_ok) { 370ed0dfffdSEric Dumazet struct sock *sk2; 371ed0dfffdSEric Dumazet 372538950a1SCraig Gallek sk2 = reuseport_select_sock(sk, hash, skb, 373538950a1SCraig Gallek sizeof(struct udphdr)); 374e32ea7e7SCraig Gallek if (sk2) { 375e32ea7e7SCraig Gallek result = sk2; 376ed0dfffdSEric Dumazet select_ok = false; 377e32ea7e7SCraig Gallek goto found; 378e32ea7e7SCraig Gallek } 379ed0dfffdSEric Dumazet } 38072289b96STom Herbert matches = 1; 38172289b96STom Herbert } 38272289b96STom Herbert } else if (score == badness && reuseport) { 38372289b96STom Herbert matches++; 3848fc54f68SDaniel Borkmann if (reciprocal_scale(hash, matches) == 0) 38572289b96STom Herbert result = sk; 38672289b96STom Herbert hash = next_pseudo_random32(hash); 387db8dac20SDavid S. Miller } 388db8dac20SDavid S. Miller } 38988ab1932SEric Dumazet /* 39088ab1932SEric Dumazet * if the nulls value we got at the end of this lookup is 39188ab1932SEric Dumazet * not the expected one, we must restart lookup. 39288ab1932SEric Dumazet * We probably met an item that was moved to another chain. 39388ab1932SEric Dumazet */ 394fddc17deSEric Dumazet if (get_nulls_value(node) != slot) 39588ab1932SEric Dumazet goto begin; 39688ab1932SEric Dumazet 397271b72c7SEric Dumazet if (result) { 398e32ea7e7SCraig Gallek found: 399c31504dcSEric Dumazet if (unlikely(!atomic_inc_not_zero_hint(&result->sk_refcnt, 2))) 400271b72c7SEric Dumazet result = NULL; 401271b72c7SEric Dumazet else if (unlikely(compute_score(result, net, hnum, saddr, sport, 402271b72c7SEric Dumazet daddr, dport, dif) < badness)) { 403271b72c7SEric Dumazet sock_put(result); 404271b72c7SEric Dumazet goto begin; 405271b72c7SEric Dumazet } 406271b72c7SEric Dumazet } 407271b72c7SEric Dumazet rcu_read_unlock(); 408db8dac20SDavid S. Miller return result; 409db8dac20SDavid S. Miller } 410fce82338SPavel Emelyanov EXPORT_SYMBOL_GPL(__udp6_lib_lookup); 411db8dac20SDavid S. Miller 412607c4aafSKOVACS Krisztian static struct sock *__udp6_lib_lookup_skb(struct sk_buff *skb, 413607c4aafSKOVACS Krisztian __be16 sport, __be16 dport, 414645ca708SEric Dumazet struct udp_table *udptable) 415607c4aafSKOVACS Krisztian { 41623542618SKOVACS Krisztian struct sock *sk; 417b71d1d42SEric Dumazet const struct ipv6hdr *iph = ipv6_hdr(skb); 418607c4aafSKOVACS Krisztian 419e5d08d71SIan Morris sk = skb_steal_sock(skb); 420e5d08d71SIan Morris if (unlikely(sk)) 42123542618SKOVACS Krisztian return sk; 422adf30907SEric Dumazet return __udp6_lib_lookup(dev_net(skb_dst(skb)->dev), &iph->saddr, sport, 423607c4aafSKOVACS Krisztian &iph->daddr, dport, inet6_iif(skb), 424538950a1SCraig Gallek udptable, skb); 425607c4aafSKOVACS Krisztian } 426607c4aafSKOVACS Krisztian 427aa976fc0SBalazs Scheidler struct sock *udp6_lib_lookup(struct net *net, const struct in6_addr *saddr, __be16 sport, 428aa976fc0SBalazs Scheidler const struct in6_addr *daddr, __be16 dport, int dif) 429aa976fc0SBalazs Scheidler { 430538950a1SCraig Gallek return __udp6_lib_lookup(net, saddr, sport, daddr, dport, dif, &udp_table, NULL); 431aa976fc0SBalazs Scheidler } 432aa976fc0SBalazs Scheidler EXPORT_SYMBOL_GPL(udp6_lib_lookup); 433aa976fc0SBalazs Scheidler 434db8dac20SDavid S. Miller /* 435db8dac20SDavid S. Miller * This should be easy, if there is something there we 436db8dac20SDavid S. Miller * return it, otherwise we block. 437db8dac20SDavid S. Miller */ 438db8dac20SDavid S. Miller 4391b784140SYing Xue int udpv6_recvmsg(struct sock *sk, struct msghdr *msg, size_t len, 440db8dac20SDavid S. Miller int noblock, int flags, int *addr_len) 441db8dac20SDavid S. Miller { 442db8dac20SDavid S. Miller struct ipv6_pinfo *np = inet6_sk(sk); 443db8dac20SDavid S. Miller struct inet_sock *inet = inet_sk(sk); 444db8dac20SDavid S. Miller struct sk_buff *skb; 44559c2cdaeSDavid S. Miller unsigned int ulen, copied; 4463f518bf7SPavel Emelyanov int peeked, off = 0; 447db8dac20SDavid S. Miller int err; 448db8dac20SDavid S. Miller int is_udplite = IS_UDPLITE(sk); 449197c949eSEric Dumazet bool checksum_valid = false; 450f26ba175SWei Yongjun int is_udp4; 4518a74ad60SEric Dumazet bool slow; 452db8dac20SDavid S. Miller 453db8dac20SDavid S. Miller if (flags & MSG_ERRQUEUE) 45485fbaa75SHannes Frederic Sowa return ipv6_recv_error(sk, msg, len, addr_len); 455db8dac20SDavid S. Miller 4564b340ae2SBrian Haley if (np->rxpmtu && np->rxopt.bits.rxpmtu) 45785fbaa75SHannes Frederic Sowa return ipv6_recv_rxpmtu(sk, msg, len, addr_len); 4584b340ae2SBrian Haley 459db8dac20SDavid S. Miller try_again: 460db8dac20SDavid S. Miller skb = __skb_recv_datagram(sk, flags | (noblock ? MSG_DONTWAIT : 0), 4613f518bf7SPavel Emelyanov &peeked, &off, &err); 462db8dac20SDavid S. Miller if (!skb) 463db8dac20SDavid S. Miller goto out; 464db8dac20SDavid S. Miller 465db8dac20SDavid S. Miller ulen = skb->len - sizeof(struct udphdr); 46659c2cdaeSDavid S. Miller copied = len; 46759c2cdaeSDavid S. Miller if (copied > ulen) 46859c2cdaeSDavid S. Miller copied = ulen; 46959c2cdaeSDavid S. Miller else if (copied < ulen) 470db8dac20SDavid S. Miller msg->msg_flags |= MSG_TRUNC; 471db8dac20SDavid S. Miller 472f26ba175SWei Yongjun is_udp4 = (skb->protocol == htons(ETH_P_IP)); 473f26ba175SWei Yongjun 474db8dac20SDavid S. Miller /* 475db8dac20SDavid S. Miller * If checksum is needed at all, try to do it while copying the 476db8dac20SDavid S. Miller * data. If the data is truncated, or if we only want a partial 477db8dac20SDavid S. Miller * coverage checksum (UDP-Lite), do it before the copy. 478db8dac20SDavid S. Miller */ 479db8dac20SDavid S. Miller 48059c2cdaeSDavid S. Miller if (copied < ulen || UDP_SKB_CB(skb)->partial_cov) { 481197c949eSEric Dumazet checksum_valid = !udp_lib_checksum_complete(skb); 482197c949eSEric Dumazet if (!checksum_valid) 483db8dac20SDavid S. Miller goto csum_copy_err; 484db8dac20SDavid S. Miller } 485db8dac20SDavid S. Miller 486197c949eSEric Dumazet if (checksum_valid || skb_csum_unnecessary(skb)) 48751f3d02bSDavid S. Miller err = skb_copy_datagram_msg(skb, sizeof(struct udphdr), 48851f3d02bSDavid S. Miller msg, copied); 489db8dac20SDavid S. Miller else { 490227158dbSAl Viro err = skb_copy_and_csum_datagram_msg(skb, sizeof(struct udphdr), msg); 491db8dac20SDavid S. Miller if (err == -EINVAL) 492db8dac20SDavid S. Miller goto csum_copy_err; 493db8dac20SDavid S. Miller } 49422911fc5SEric Dumazet if (unlikely(err)) { 49522911fc5SEric Dumazet trace_kfree_skb(skb, udpv6_recvmsg); 496979402b1SEric Dumazet if (!peeked) { 497979402b1SEric Dumazet atomic_inc(&sk->sk_drops); 498979402b1SEric Dumazet if (is_udp4) 499979402b1SEric Dumazet UDP_INC_STATS_USER(sock_net(sk), 500979402b1SEric Dumazet UDP_MIB_INERRORS, 501979402b1SEric Dumazet is_udplite); 502979402b1SEric Dumazet else 503979402b1SEric Dumazet UDP6_INC_STATS_USER(sock_net(sk), 504979402b1SEric Dumazet UDP_MIB_INERRORS, 505979402b1SEric Dumazet is_udplite); 506979402b1SEric Dumazet } 507db8dac20SDavid S. Miller goto out_free; 50822911fc5SEric Dumazet } 509f26ba175SWei Yongjun if (!peeked) { 510f26ba175SWei Yongjun if (is_udp4) 511f26ba175SWei Yongjun UDP_INC_STATS_USER(sock_net(sk), 512f26ba175SWei Yongjun UDP_MIB_INDATAGRAMS, is_udplite); 513f26ba175SWei Yongjun else 514235b9f7aSPavel Emelyanov UDP6_INC_STATS_USER(sock_net(sk), 515235b9f7aSPavel Emelyanov UDP_MIB_INDATAGRAMS, is_udplite); 516f26ba175SWei Yongjun } 517db8dac20SDavid S. Miller 5183b885787SNeil Horman sock_recv_ts_and_drops(msg, sk, skb); 519db8dac20SDavid S. Miller 520db8dac20SDavid S. Miller /* Copy the address. */ 521db8dac20SDavid S. Miller if (msg->msg_name) { 522342dfc30SSteffen Hurrle DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, msg->msg_name); 523db8dac20SDavid S. Miller sin6->sin6_family = AF_INET6; 524db8dac20SDavid S. Miller sin6->sin6_port = udp_hdr(skb)->source; 525db8dac20SDavid S. Miller sin6->sin6_flowinfo = 0; 526db8dac20SDavid S. Miller 527842df073SHannes Frederic Sowa if (is_udp4) { 528b301e82cSBrian Haley ipv6_addr_set_v4mapped(ip_hdr(skb)->saddr, 529b301e82cSBrian Haley &sin6->sin6_addr); 530842df073SHannes Frederic Sowa sin6->sin6_scope_id = 0; 531842df073SHannes Frederic Sowa } else { 5324e3fd7a0SAlexey Dobriyan sin6->sin6_addr = ipv6_hdr(skb)->saddr; 533842df073SHannes Frederic Sowa sin6->sin6_scope_id = 534842df073SHannes Frederic Sowa ipv6_iface_scope_id(&sin6->sin6_addr, 5354330487aSDuan Jiong inet6_iif(skb)); 536db8dac20SDavid S. Miller } 537bceaa902SHannes Frederic Sowa *addr_len = sizeof(*sin6); 538db8dac20SDavid S. Miller } 5394b261c75SHannes Frederic Sowa 5404b261c75SHannes Frederic Sowa if (np->rxopt.all) 5414b261c75SHannes Frederic Sowa ip6_datagram_recv_common_ctl(sk, msg, skb); 5424b261c75SHannes Frederic Sowa 543f26ba175SWei Yongjun if (is_udp4) { 544db8dac20SDavid S. Miller if (inet->cmsg_flags) 545db8dac20SDavid S. Miller ip_cmsg_recv(msg, skb); 546db8dac20SDavid S. Miller } else { 547db8dac20SDavid S. Miller if (np->rxopt.all) 5484b261c75SHannes Frederic Sowa ip6_datagram_recv_specific_ctl(sk, msg, skb); 549db8dac20SDavid S. Miller } 550db8dac20SDavid S. Miller 55159c2cdaeSDavid S. Miller err = copied; 552db8dac20SDavid S. Miller if (flags & MSG_TRUNC) 553db8dac20SDavid S. Miller err = ulen; 554db8dac20SDavid S. Miller 555db8dac20SDavid S. Miller out_free: 5569d410c79SEric Dumazet skb_free_datagram_locked(sk, skb); 557db8dac20SDavid S. Miller out: 558db8dac20SDavid S. Miller return err; 559db8dac20SDavid S. Miller 560db8dac20SDavid S. Miller csum_copy_err: 5618a74ad60SEric Dumazet slow = lock_sock_fast(sk); 5620856f939SWei Yongjun if (!skb_kill_datagram(sk, skb, flags)) { 5636a5dc9e5SEric Dumazet if (is_udp4) { 5646a5dc9e5SEric Dumazet UDP_INC_STATS_USER(sock_net(sk), 5656a5dc9e5SEric Dumazet UDP_MIB_CSUMERRORS, is_udplite); 5660856f939SWei Yongjun UDP_INC_STATS_USER(sock_net(sk), 5670856f939SWei Yongjun UDP_MIB_INERRORS, is_udplite); 5686a5dc9e5SEric Dumazet } else { 5696a5dc9e5SEric Dumazet UDP6_INC_STATS_USER(sock_net(sk), 5706a5dc9e5SEric Dumazet UDP_MIB_CSUMERRORS, is_udplite); 5710856f939SWei Yongjun UDP6_INC_STATS_USER(sock_net(sk), 5720856f939SWei Yongjun UDP_MIB_INERRORS, is_udplite); 5730856f939SWei Yongjun } 5746a5dc9e5SEric Dumazet } 5758a74ad60SEric Dumazet unlock_sock_fast(sk, slow); 576db8dac20SDavid S. Miller 577beb39db5SEric Dumazet /* starting over for a new packet, but check if we need to yield */ 578beb39db5SEric Dumazet cond_resched(); 5799cfaa8deSXufeng Zhang msg->msg_flags &= ~MSG_TRUNC; 580db8dac20SDavid S. Miller goto try_again; 581db8dac20SDavid S. Miller } 582db8dac20SDavid S. Miller 583db8dac20SDavid S. Miller void __udp6_lib_err(struct sk_buff *skb, struct inet6_skb_parm *opt, 584d5fdd6baSBrian Haley u8 type, u8 code, int offset, __be32 info, 585645ca708SEric Dumazet struct udp_table *udptable) 586db8dac20SDavid S. Miller { 587db8dac20SDavid S. Miller struct ipv6_pinfo *np; 588b71d1d42SEric Dumazet const struct ipv6hdr *hdr = (const struct ipv6hdr *)skb->data; 589b71d1d42SEric Dumazet const struct in6_addr *saddr = &hdr->saddr; 590b71d1d42SEric Dumazet const struct in6_addr *daddr = &hdr->daddr; 591db8dac20SDavid S. Miller struct udphdr *uh = (struct udphdr *)(skb->data+offset); 592db8dac20SDavid S. Miller struct sock *sk; 593db8dac20SDavid S. Miller int err; 5947304fe46SDuan Jiong struct net *net = dev_net(skb->dev); 595db8dac20SDavid S. Miller 596e32ea7e7SCraig Gallek sk = __udp6_lib_lookup(net, daddr, uh->dest, saddr, uh->source, 597538950a1SCraig Gallek inet6_iif(skb), udptable, skb); 59863159f29SIan Morris if (!sk) { 5997304fe46SDuan Jiong ICMP6_INC_STATS_BH(net, __in6_dev_get(skb->dev), 6007304fe46SDuan Jiong ICMP6_MIB_INERRORS); 601db8dac20SDavid S. Miller return; 6027304fe46SDuan Jiong } 603db8dac20SDavid S. Miller 60493b36cf3SHannes Frederic Sowa if (type == ICMPV6_PKT_TOOBIG) { 60593b36cf3SHannes Frederic Sowa if (!ip6_sk_accept_pmtu(sk)) 60693b36cf3SHannes Frederic Sowa goto out; 60781aded24SDavid S. Miller ip6_sk_update_pmtu(skb, sk, info); 60893b36cf3SHannes Frederic Sowa } 6091a462d18SDuan Jiong if (type == NDISC_REDIRECT) { 610ec18d9a2SDavid S. Miller ip6_sk_redirect(skb, sk); 6111a462d18SDuan Jiong goto out; 6121a462d18SDuan Jiong } 61381aded24SDavid S. Miller 614db8dac20SDavid S. Miller np = inet6_sk(sk); 615db8dac20SDavid S. Miller 616db8dac20SDavid S. Miller if (!icmpv6_err_convert(type, code, &err) && !np->recverr) 617db8dac20SDavid S. Miller goto out; 618db8dac20SDavid S. Miller 619db8dac20SDavid S. Miller if (sk->sk_state != TCP_ESTABLISHED && !np->recverr) 620db8dac20SDavid S. Miller goto out; 621db8dac20SDavid S. Miller 622b1faf566SEric Dumazet if (np->recverr) 623db8dac20SDavid S. Miller ipv6_icmp_error(sk, skb, err, uh->dest, ntohl(info), (u8 *)(uh+1)); 624b1faf566SEric Dumazet 625db8dac20SDavid S. Miller sk->sk_err = err; 626db8dac20SDavid S. Miller sk->sk_error_report(sk); 627db8dac20SDavid S. Miller out: 628db8dac20SDavid S. Miller sock_put(sk); 629db8dac20SDavid S. Miller } 630db8dac20SDavid S. Miller 631f7ad74feSBenjamin LaHaise static int __udpv6_queue_rcv_skb(struct sock *sk, struct sk_buff *skb) 632f7ad74feSBenjamin LaHaise { 633f7ad74feSBenjamin LaHaise int rc; 634f7ad74feSBenjamin LaHaise 635efe4208fSEric Dumazet if (!ipv6_addr_any(&sk->sk_v6_daddr)) { 636f7ad74feSBenjamin LaHaise sock_rps_save_rxhash(sk, skb); 637005ec974SShawn Bohrer sk_mark_napi_id(sk, skb); 6382c8c56e1SEric Dumazet sk_incoming_cpu_update(sk); 639005ec974SShawn Bohrer } 640f7ad74feSBenjamin LaHaise 641f7ad74feSBenjamin LaHaise rc = sock_queue_rcv_skb(sk, skb); 642f7ad74feSBenjamin LaHaise if (rc < 0) { 643f7ad74feSBenjamin LaHaise int is_udplite = IS_UDPLITE(sk); 644f7ad74feSBenjamin LaHaise 645f7ad74feSBenjamin LaHaise /* Note that an ENOMEM error is charged twice */ 646f7ad74feSBenjamin LaHaise if (rc == -ENOMEM) 647f7ad74feSBenjamin LaHaise UDP6_INC_STATS_BH(sock_net(sk), 648f7ad74feSBenjamin LaHaise UDP_MIB_RCVBUFERRORS, is_udplite); 649f7ad74feSBenjamin LaHaise UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_INERRORS, is_udplite); 650f7ad74feSBenjamin LaHaise kfree_skb(skb); 651f7ad74feSBenjamin LaHaise return -1; 652f7ad74feSBenjamin LaHaise } 653f7ad74feSBenjamin LaHaise return 0; 654f7ad74feSBenjamin LaHaise } 655f7ad74feSBenjamin LaHaise 656db8dac20SDavid S. Miller static __inline__ void udpv6_err(struct sk_buff *skb, 657d5fdd6baSBrian Haley struct inet6_skb_parm *opt, u8 type, 658d5fdd6baSBrian Haley u8 code, int offset, __be32 info) 659db8dac20SDavid S. Miller { 660645ca708SEric Dumazet __udp6_lib_err(skb, opt, type, code, offset, info, &udp_table); 661db8dac20SDavid S. Miller } 662db8dac20SDavid S. Miller 663d7f3f621SBenjamin LaHaise static struct static_key udpv6_encap_needed __read_mostly; 664d7f3f621SBenjamin LaHaise void udpv6_encap_enable(void) 665d7f3f621SBenjamin LaHaise { 666d7f3f621SBenjamin LaHaise if (!static_key_enabled(&udpv6_encap_needed)) 667d7f3f621SBenjamin LaHaise static_key_slow_inc(&udpv6_encap_needed); 668d7f3f621SBenjamin LaHaise } 669d7f3f621SBenjamin LaHaise EXPORT_SYMBOL(udpv6_encap_enable); 670d7f3f621SBenjamin LaHaise 671db8dac20SDavid S. Miller int udpv6_queue_rcv_skb(struct sock *sk, struct sk_buff *skb) 672db8dac20SDavid S. Miller { 673db8dac20SDavid S. Miller struct udp_sock *up = udp_sk(sk); 674db8dac20SDavid S. Miller int rc; 675db8dac20SDavid S. Miller int is_udplite = IS_UDPLITE(sk); 676db8dac20SDavid S. Miller 677db8dac20SDavid S. Miller if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb)) 678db8dac20SDavid S. Miller goto drop; 679db8dac20SDavid S. Miller 680d7f3f621SBenjamin LaHaise if (static_key_false(&udpv6_encap_needed) && up->encap_type) { 681d7f3f621SBenjamin LaHaise int (*encap_rcv)(struct sock *sk, struct sk_buff *skb); 682d7f3f621SBenjamin LaHaise 683d7f3f621SBenjamin LaHaise /* 684d7f3f621SBenjamin LaHaise * This is an encapsulation socket so pass the skb to 685d7f3f621SBenjamin LaHaise * the socket's udp_encap_rcv() hook. Otherwise, just 686d7f3f621SBenjamin LaHaise * fall through and pass this up the UDP socket. 687d7f3f621SBenjamin LaHaise * up->encap_rcv() returns the following value: 688d7f3f621SBenjamin LaHaise * =0 if skb was successfully passed to the encap 689d7f3f621SBenjamin LaHaise * handler or was discarded by it. 690d7f3f621SBenjamin LaHaise * >0 if skb should be passed on to UDP. 691d7f3f621SBenjamin LaHaise * <0 if skb should be resubmitted as proto -N 692d7f3f621SBenjamin LaHaise */ 693d7f3f621SBenjamin LaHaise 694d7f3f621SBenjamin LaHaise /* if we're overly short, let UDP handle it */ 695d7f3f621SBenjamin LaHaise encap_rcv = ACCESS_ONCE(up->encap_rcv); 69653b24b8fSIan Morris if (skb->len > sizeof(struct udphdr) && encap_rcv) { 697d7f3f621SBenjamin LaHaise int ret; 698d7f3f621SBenjamin LaHaise 6990a80966bSTom Herbert /* Verify checksum before giving to encap */ 7000a80966bSTom Herbert if (udp_lib_checksum_complete(skb)) 7010a80966bSTom Herbert goto csum_error; 7020a80966bSTom Herbert 703d7f3f621SBenjamin LaHaise ret = encap_rcv(sk, skb); 704d7f3f621SBenjamin LaHaise if (ret <= 0) { 705d7f3f621SBenjamin LaHaise UDP_INC_STATS_BH(sock_net(sk), 706d7f3f621SBenjamin LaHaise UDP_MIB_INDATAGRAMS, 707d7f3f621SBenjamin LaHaise is_udplite); 708d7f3f621SBenjamin LaHaise return -ret; 709d7f3f621SBenjamin LaHaise } 710d7f3f621SBenjamin LaHaise } 711d7f3f621SBenjamin LaHaise 712d7f3f621SBenjamin LaHaise /* FALLTHROUGH -- it's a UDP Packet */ 713d7f3f621SBenjamin LaHaise } 714d7f3f621SBenjamin LaHaise 715db8dac20SDavid S. Miller /* 716db8dac20SDavid S. Miller * UDP-Lite specific tests, ignored on UDP sockets (see net/ipv4/udp.c). 717db8dac20SDavid S. Miller */ 718db8dac20SDavid S. Miller if ((is_udplite & UDPLITE_RECV_CC) && UDP_SKB_CB(skb)->partial_cov) { 719db8dac20SDavid S. Miller 720db8dac20SDavid S. Miller if (up->pcrlen == 0) { /* full coverage was set */ 721ba7a46f1SJoe Perches net_dbg_ratelimited("UDPLITE6: partial coverage %d while full coverage %d requested\n", 722db8dac20SDavid S. Miller UDP_SKB_CB(skb)->cscov, skb->len); 723db8dac20SDavid S. Miller goto drop; 724db8dac20SDavid S. Miller } 725db8dac20SDavid S. Miller if (UDP_SKB_CB(skb)->cscov < up->pcrlen) { 726ba7a46f1SJoe Perches net_dbg_ratelimited("UDPLITE6: coverage %d too small, need min %d\n", 727db8dac20SDavid S. Miller UDP_SKB_CB(skb)->cscov, up->pcrlen); 728db8dac20SDavid S. Miller goto drop; 729db8dac20SDavid S. Miller } 730db8dac20SDavid S. Miller } 731db8dac20SDavid S. Miller 73233d480ceSEric Dumazet if (rcu_access_pointer(sk->sk_filter)) { 733db8dac20SDavid S. Miller if (udp_lib_checksum_complete(skb)) 7346a5dc9e5SEric Dumazet goto csum_error; 735db8dac20SDavid S. Miller } 736db8dac20SDavid S. Miller 737274f482dSSorin Dumitru if (sk_rcvqueues_full(sk, sk->sk_rcvbuf)) { 7383e215c8dSJames M Leddy UDP6_INC_STATS_BH(sock_net(sk), 7393e215c8dSJames M Leddy UDP_MIB_RCVBUFERRORS, is_udplite); 740cb80ef46SBenjamin LaHaise goto drop; 7413e215c8dSJames M Leddy } 742cb80ef46SBenjamin LaHaise 743d826eb14SEric Dumazet skb_dst_drop(skb); 744db8dac20SDavid S. Miller 745cb80ef46SBenjamin LaHaise bh_lock_sock(sk); 746cb80ef46SBenjamin LaHaise rc = 0; 747cb80ef46SBenjamin LaHaise if (!sock_owned_by_user(sk)) 748f7ad74feSBenjamin LaHaise rc = __udpv6_queue_rcv_skb(sk, skb); 749cb80ef46SBenjamin LaHaise else if (sk_add_backlog(sk, skb, sk->sk_rcvbuf)) { 750cb80ef46SBenjamin LaHaise bh_unlock_sock(sk); 751cb80ef46SBenjamin LaHaise goto drop; 752cb80ef46SBenjamin LaHaise } 753cb80ef46SBenjamin LaHaise bh_unlock_sock(sk); 754f7ad74feSBenjamin LaHaise 755f7ad74feSBenjamin LaHaise return rc; 7563e215c8dSJames M Leddy 7576a5dc9e5SEric Dumazet csum_error: 7586a5dc9e5SEric Dumazet UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_CSUMERRORS, is_udplite); 759db8dac20SDavid S. Miller drop: 760ef28d1a2SPavel Emelyanov UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_INERRORS, is_udplite); 761cb80ef46SBenjamin LaHaise atomic_inc(&sk->sk_drops); 762db8dac20SDavid S. Miller kfree_skb(skb); 763db8dac20SDavid S. Miller return -1; 764db8dac20SDavid S. Miller } 765db8dac20SDavid S. Miller 7665cf3d461SDavid Held static bool __udp_v6_is_mcast_sock(struct net *net, struct sock *sk, 767b71d1d42SEric Dumazet __be16 loc_port, const struct in6_addr *loc_addr, 768b71d1d42SEric Dumazet __be16 rmt_port, const struct in6_addr *rmt_addr, 7695cf3d461SDavid Held int dif, unsigned short hnum) 770db8dac20SDavid S. Miller { 7719e89fd8bSSven Wegener struct inet_sock *inet = inet_sk(sk); 772db8dac20SDavid S. Miller 7739e89fd8bSSven Wegener if (!net_eq(sock_net(sk), net)) 7745cf3d461SDavid Held return false; 775b8ad0cbcSDaniel Lezcano 7765cf3d461SDavid Held if (udp_sk(sk)->udp_port_hash != hnum || 7775cf3d461SDavid Held sk->sk_family != PF_INET6 || 7785cf3d461SDavid Held (inet->inet_dport && inet->inet_dport != rmt_port) || 7795cf3d461SDavid Held (!ipv6_addr_any(&sk->sk_v6_daddr) && 7805cf3d461SDavid Held !ipv6_addr_equal(&sk->sk_v6_daddr, rmt_addr)) || 78133b4b015SHenning Rogge (sk->sk_bound_dev_if && sk->sk_bound_dev_if != dif) || 78233b4b015SHenning Rogge (!ipv6_addr_any(&sk->sk_v6_rcv_saddr) && 78333b4b015SHenning Rogge !ipv6_addr_equal(&sk->sk_v6_rcv_saddr, loc_addr))) 7845cf3d461SDavid Held return false; 7859e89fd8bSSven Wegener if (!inet6_mc_check(sk, loc_addr, rmt_addr)) 7865cf3d461SDavid Held return false; 7875cf3d461SDavid Held return true; 788db8dac20SDavid S. Miller } 789db8dac20SDavid S. Miller 790a1ab77f9SEric Dumazet static void flush_stack(struct sock **stack, unsigned int count, 791a1ab77f9SEric Dumazet struct sk_buff *skb, unsigned int final) 792a1ab77f9SEric Dumazet { 793cb80ef46SBenjamin LaHaise struct sk_buff *skb1 = NULL; 794a1ab77f9SEric Dumazet struct sock *sk; 795cb80ef46SBenjamin LaHaise unsigned int i; 796a1ab77f9SEric Dumazet 797a1ab77f9SEric Dumazet for (i = 0; i < count; i++) { 798a1ab77f9SEric Dumazet sk = stack[i]; 79963159f29SIan Morris if (likely(!skb1)) 800cb80ef46SBenjamin LaHaise skb1 = (i == final) ? skb : skb_clone(skb, GFP_ATOMIC); 801cb80ef46SBenjamin LaHaise if (!skb1) { 802f6b8f32cSEric Dumazet atomic_inc(&sk->sk_drops); 803cb80ef46SBenjamin LaHaise UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_RCVBUFERRORS, 804cb80ef46SBenjamin LaHaise IS_UDPLITE(sk)); 805cb80ef46SBenjamin LaHaise UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_INERRORS, 806cb80ef46SBenjamin LaHaise IS_UDPLITE(sk)); 807a1ab77f9SEric Dumazet } 808cb80ef46SBenjamin LaHaise 809cb80ef46SBenjamin LaHaise if (skb1 && udpv6_queue_rcv_skb(sk, skb1) <= 0) 810cb80ef46SBenjamin LaHaise skb1 = NULL; 8112dc41cffSDavid Held sock_put(sk); 812cb80ef46SBenjamin LaHaise } 813cb80ef46SBenjamin LaHaise if (unlikely(skb1)) 814cb80ef46SBenjamin LaHaise kfree_skb(skb1); 815a1ab77f9SEric Dumazet } 8164068579eSTom Herbert 8174068579eSTom Herbert static void udp6_csum_zero_error(struct sk_buff *skb) 8184068579eSTom Herbert { 8194068579eSTom Herbert /* RFC 2460 section 8.1 says that we SHOULD log 8204068579eSTom Herbert * this error. Well, it is reasonable. 8214068579eSTom Herbert */ 822ba7a46f1SJoe Perches net_dbg_ratelimited("IPv6: udp checksum is 0 for [%pI6c]:%u->[%pI6c]:%u\n", 8234068579eSTom Herbert &ipv6_hdr(skb)->saddr, ntohs(udp_hdr(skb)->source), 8244068579eSTom Herbert &ipv6_hdr(skb)->daddr, ntohs(udp_hdr(skb)->dest)); 8254068579eSTom Herbert } 8264068579eSTom Herbert 827db8dac20SDavid S. Miller /* 828db8dac20SDavid S. Miller * Note: called only from the BH handler context, 829db8dac20SDavid S. Miller * so we don't need to lock the hashes. 830db8dac20SDavid S. Miller */ 831e3163493SPavel Emelyanov static int __udp6_lib_mcast_deliver(struct net *net, struct sk_buff *skb, 832b71d1d42SEric Dumazet const struct in6_addr *saddr, const struct in6_addr *daddr, 83336cbb245SRick Jones struct udp_table *udptable, int proto) 834db8dac20SDavid S. Miller { 835a1ab77f9SEric Dumazet struct sock *sk, *stack[256 / sizeof(struct sock *)]; 836db8dac20SDavid S. Miller const struct udphdr *uh = udp_hdr(skb); 8375cf3d461SDavid Held struct hlist_nulls_node *node; 8385cf3d461SDavid Held unsigned short hnum = ntohs(uh->dest); 8395cf3d461SDavid Held struct udp_hslot *hslot = udp_hashslot(udptable, net, hnum); 8405cf3d461SDavid Held int dif = inet6_iif(skb); 8412dc41cffSDavid Held unsigned int count = 0, offset = offsetof(typeof(*sk), sk_nulls_node); 8422dc41cffSDavid Held unsigned int hash2 = 0, hash2_any = 0, use_hash2 = (hslot->count > 10); 84336cbb245SRick Jones bool inner_flushed = false; 8442dc41cffSDavid Held 8452dc41cffSDavid Held if (use_hash2) { 8462dc41cffSDavid Held hash2_any = udp6_portaddr_hash(net, &in6addr_any, hnum) & 8472dc41cffSDavid Held udp_table.mask; 8482dc41cffSDavid Held hash2 = udp6_portaddr_hash(net, daddr, hnum) & udp_table.mask; 8492dc41cffSDavid Held start_lookup: 8502dc41cffSDavid Held hslot = &udp_table.hash2[hash2]; 8512dc41cffSDavid Held offset = offsetof(typeof(*sk), __sk_common.skc_portaddr_node); 8522dc41cffSDavid Held } 853db8dac20SDavid S. Miller 854645ca708SEric Dumazet spin_lock(&hslot->lock); 8552dc41cffSDavid Held sk_nulls_for_each_entry_offset(sk, node, &hslot->head, offset) { 8565cf3d461SDavid Held if (__udp_v6_is_mcast_sock(net, sk, 8575cf3d461SDavid Held uh->dest, daddr, 8585cf3d461SDavid Held uh->source, saddr, 8595cf3d461SDavid Held dif, hnum) && 8601c19448cSTom Herbert /* If zero checksum and no_check is not on for 8614068579eSTom Herbert * the socket then skip it. 8624068579eSTom Herbert */ 8635cf3d461SDavid Held (uh->check || udp_sk(sk)->no_check6_rx)) { 864a1ab77f9SEric Dumazet if (unlikely(count == ARRAY_SIZE(stack))) { 865a1ab77f9SEric Dumazet flush_stack(stack, count, skb, ~0); 86636cbb245SRick Jones inner_flushed = true; 867a1ab77f9SEric Dumazet count = 0; 868db8dac20SDavid S. Miller } 8695cf3d461SDavid Held stack[count++] = sk; 8702dc41cffSDavid Held sock_hold(sk); 8715cf3d461SDavid Held } 872a1ab77f9SEric Dumazet } 873db8dac20SDavid S. Miller 874645ca708SEric Dumazet spin_unlock(&hslot->lock); 875a1ab77f9SEric Dumazet 8762dc41cffSDavid Held /* Also lookup *:port if we are using hash2 and haven't done so yet. */ 8772dc41cffSDavid Held if (use_hash2 && hash2 != hash2_any) { 8782dc41cffSDavid Held hash2 = hash2_any; 8792dc41cffSDavid Held goto start_lookup; 8802dc41cffSDavid Held } 8812dc41cffSDavid Held 882a1ab77f9SEric Dumazet if (count) { 883a1ab77f9SEric Dumazet flush_stack(stack, count, skb, count - 1); 884a1ab77f9SEric Dumazet } else { 88536cbb245SRick Jones if (!inner_flushed) 88636cbb245SRick Jones UDP_INC_STATS_BH(net, UDP_MIB_IGNOREDMULTI, 88736cbb245SRick Jones proto == IPPROTO_UDPLITE); 88836cbb245SRick Jones consume_skb(skb); 889a1ab77f9SEric Dumazet } 890db8dac20SDavid S. Miller return 0; 891db8dac20SDavid S. Miller } 892db8dac20SDavid S. Miller 893645ca708SEric Dumazet int __udp6_lib_rcv(struct sk_buff *skb, struct udp_table *udptable, 894db8dac20SDavid S. Miller int proto) 895db8dac20SDavid S. Miller { 8963ffe533cSAlexey Dobriyan struct net *net = dev_net(skb->dev); 897db8dac20SDavid S. Miller struct sock *sk; 898db8dac20SDavid S. Miller struct udphdr *uh; 899b71d1d42SEric Dumazet const struct in6_addr *saddr, *daddr; 900db8dac20SDavid S. Miller u32 ulen = 0; 901db8dac20SDavid S. Miller 902db8dac20SDavid S. Miller if (!pskb_may_pull(skb, sizeof(struct udphdr))) 903d6bc0149SBjørn Mork goto discard; 904db8dac20SDavid S. Miller 905db8dac20SDavid S. Miller saddr = &ipv6_hdr(skb)->saddr; 906db8dac20SDavid S. Miller daddr = &ipv6_hdr(skb)->daddr; 907db8dac20SDavid S. Miller uh = udp_hdr(skb); 908db8dac20SDavid S. Miller 909db8dac20SDavid S. Miller ulen = ntohs(uh->len); 910db8dac20SDavid S. Miller if (ulen > skb->len) 911db8dac20SDavid S. Miller goto short_packet; 912db8dac20SDavid S. Miller 913db8dac20SDavid S. Miller if (proto == IPPROTO_UDP) { 914db8dac20SDavid S. Miller /* UDP validates ulen. */ 915db8dac20SDavid S. Miller 916db8dac20SDavid S. Miller /* Check for jumbo payload */ 917db8dac20SDavid S. Miller if (ulen == 0) 918db8dac20SDavid S. Miller ulen = skb->len; 919db8dac20SDavid S. Miller 920db8dac20SDavid S. Miller if (ulen < sizeof(*uh)) 921db8dac20SDavid S. Miller goto short_packet; 922db8dac20SDavid S. Miller 923db8dac20SDavid S. Miller if (ulen < skb->len) { 924db8dac20SDavid S. Miller if (pskb_trim_rcsum(skb, ulen)) 925db8dac20SDavid S. Miller goto short_packet; 926db8dac20SDavid S. Miller saddr = &ipv6_hdr(skb)->saddr; 927db8dac20SDavid S. Miller daddr = &ipv6_hdr(skb)->daddr; 928db8dac20SDavid S. Miller uh = udp_hdr(skb); 929db8dac20SDavid S. Miller } 930db8dac20SDavid S. Miller } 931db8dac20SDavid S. Miller 932db8dac20SDavid S. Miller if (udp6_csum_init(skb, uh, proto)) 9336a5dc9e5SEric Dumazet goto csum_error; 934db8dac20SDavid S. Miller 935db8dac20SDavid S. Miller /* 936db8dac20SDavid S. Miller * Multicast receive code 937db8dac20SDavid S. Miller */ 938db8dac20SDavid S. Miller if (ipv6_addr_is_multicast(daddr)) 939e3163493SPavel Emelyanov return __udp6_lib_mcast_deliver(net, skb, 94036cbb245SRick Jones saddr, daddr, udptable, proto); 941db8dac20SDavid S. Miller 942db8dac20SDavid S. Miller /* Unicast */ 943db8dac20SDavid S. Miller 944db8dac20SDavid S. Miller /* 945db8dac20SDavid S. Miller * check socket cache ... must talk to Alan about his plans 946db8dac20SDavid S. Miller * for sock caches... i'll skip this for now. 947db8dac20SDavid S. Miller */ 948607c4aafSKOVACS Krisztian sk = __udp6_lib_lookup_skb(skb, uh->source, uh->dest, udptable); 94953b24b8fSIan Morris if (sk) { 950a5b50476SEliezer Tamir int ret; 951a5b50476SEliezer Tamir 9521c19448cSTom Herbert if (!uh->check && !udp_sk(sk)->no_check6_rx) { 95379e0f1c9STom Herbert sock_put(sk); 9544068579eSTom Herbert udp6_csum_zero_error(skb); 9554068579eSTom Herbert goto csum_error; 9564068579eSTom Herbert } 9574068579eSTom Herbert 958224d019cSTom Herbert if (inet_get_convert_csum(sk) && uh->check && !IS_UDPLITE(sk)) 9592abb7cdcSTom Herbert skb_checksum_try_convert(skb, IPPROTO_UDP, uh->check, 9602abb7cdcSTom Herbert ip6_compute_pseudo); 9612abb7cdcSTom Herbert 962a5b50476SEliezer Tamir ret = udpv6_queue_rcv_skb(sk, skb); 963cb80ef46SBenjamin LaHaise sock_put(sk); 964db8dac20SDavid S. Miller 965cb80ef46SBenjamin LaHaise /* a return value > 0 means to resubmit the input, but 966cb80ef46SBenjamin LaHaise * it wants the return to be -protocol, or 0 967cb80ef46SBenjamin LaHaise */ 968cb80ef46SBenjamin LaHaise if (ret > 0) 969cb80ef46SBenjamin LaHaise return -ret; 970cb80ef46SBenjamin LaHaise 971cb80ef46SBenjamin LaHaise return 0; 972cb80ef46SBenjamin LaHaise } 973cb80ef46SBenjamin LaHaise 9744068579eSTom Herbert if (!uh->check) { 9754068579eSTom Herbert udp6_csum_zero_error(skb); 9764068579eSTom Herbert goto csum_error; 9774068579eSTom Herbert } 9784068579eSTom Herbert 979db8dac20SDavid S. Miller if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) 980db8dac20SDavid S. Miller goto discard; 981db8dac20SDavid S. Miller 982db8dac20SDavid S. Miller if (udp_lib_checksum_complete(skb)) 9836a5dc9e5SEric Dumazet goto csum_error; 984db8dac20SDavid S. Miller 985cb80ef46SBenjamin LaHaise UDP6_INC_STATS_BH(net, UDP_MIB_NOPORTS, proto == IPPROTO_UDPLITE); 9863ffe533cSAlexey Dobriyan icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0); 987db8dac20SDavid S. Miller 988db8dac20SDavid S. Miller kfree_skb(skb); 989db8dac20SDavid S. Miller return 0; 990db8dac20SDavid S. Miller 991db8dac20SDavid S. Miller short_packet: 992ba7a46f1SJoe Perches net_dbg_ratelimited("UDP%sv6: short packet: From [%pI6c]:%u %d/%d to [%pI6c]:%u\n", 993db8dac20SDavid S. Miller proto == IPPROTO_UDPLITE ? "-Lite" : "", 994ba7a46f1SJoe Perches saddr, ntohs(uh->source), 995ba7a46f1SJoe Perches ulen, skb->len, 996ba7a46f1SJoe Perches daddr, ntohs(uh->dest)); 9976a5dc9e5SEric Dumazet goto discard; 9986a5dc9e5SEric Dumazet csum_error: 9996a5dc9e5SEric Dumazet UDP6_INC_STATS_BH(net, UDP_MIB_CSUMERRORS, proto == IPPROTO_UDPLITE); 1000db8dac20SDavid S. Miller discard: 1001ef28d1a2SPavel Emelyanov UDP6_INC_STATS_BH(net, UDP_MIB_INERRORS, proto == IPPROTO_UDPLITE); 1002db8dac20SDavid S. Miller kfree_skb(skb); 1003db8dac20SDavid S. Miller return 0; 1004db8dac20SDavid S. Miller } 1005db8dac20SDavid S. Miller 1006db8dac20SDavid S. Miller static __inline__ int udpv6_rcv(struct sk_buff *skb) 1007db8dac20SDavid S. Miller { 1008645ca708SEric Dumazet return __udp6_lib_rcv(skb, &udp_table, IPPROTO_UDP); 1009db8dac20SDavid S. Miller } 1010db8dac20SDavid S. Miller 1011db8dac20SDavid S. Miller /* 1012db8dac20SDavid S. Miller * Throw away all pending data and cancel the corking. Socket is locked. 1013db8dac20SDavid S. Miller */ 1014db8dac20SDavid S. Miller static void udp_v6_flush_pending_frames(struct sock *sk) 1015db8dac20SDavid S. Miller { 1016db8dac20SDavid S. Miller struct udp_sock *up = udp_sk(sk); 1017db8dac20SDavid S. Miller 101836d926b9SDenis V. Lunev if (up->pending == AF_INET) 101936d926b9SDenis V. Lunev udp_flush_pending_frames(sk); 102036d926b9SDenis V. Lunev else if (up->pending) { 1021db8dac20SDavid S. Miller up->len = 0; 1022db8dac20SDavid S. Miller up->pending = 0; 1023db8dac20SDavid S. Miller ip6_flush_pending_frames(sk); 1024db8dac20SDavid S. Miller } 1025db8dac20SDavid S. Miller } 1026db8dac20SDavid S. Miller 1027493c6be3SSridhar Samudrala /** 1028493c6be3SSridhar Samudrala * udp6_hwcsum_outgoing - handle outgoing HW checksumming 1029493c6be3SSridhar Samudrala * @sk: socket we are sending on 1030493c6be3SSridhar Samudrala * @skb: sk_buff containing the filled-in UDP header 1031493c6be3SSridhar Samudrala * (checksum field must be zeroed out) 1032493c6be3SSridhar Samudrala */ 1033493c6be3SSridhar Samudrala static void udp6_hwcsum_outgoing(struct sock *sk, struct sk_buff *skb, 1034493c6be3SSridhar Samudrala const struct in6_addr *saddr, 1035493c6be3SSridhar Samudrala const struct in6_addr *daddr, int len) 1036493c6be3SSridhar Samudrala { 1037493c6be3SSridhar Samudrala unsigned int offset; 1038493c6be3SSridhar Samudrala struct udphdr *uh = udp_hdr(skb); 1039d39d938cSVlad Yasevich struct sk_buff *frags = skb_shinfo(skb)->frag_list; 1040493c6be3SSridhar Samudrala __wsum csum = 0; 1041493c6be3SSridhar Samudrala 1042d39d938cSVlad Yasevich if (!frags) { 1043493c6be3SSridhar Samudrala /* Only one fragment on the socket. */ 1044493c6be3SSridhar Samudrala skb->csum_start = skb_transport_header(skb) - skb->head; 1045493c6be3SSridhar Samudrala skb->csum_offset = offsetof(struct udphdr, check); 1046493c6be3SSridhar Samudrala uh->check = ~csum_ipv6_magic(saddr, daddr, len, IPPROTO_UDP, 0); 1047493c6be3SSridhar Samudrala } else { 1048493c6be3SSridhar Samudrala /* 1049493c6be3SSridhar Samudrala * HW-checksum won't work as there are two or more 1050493c6be3SSridhar Samudrala * fragments on the socket so that all csums of sk_buffs 1051493c6be3SSridhar Samudrala * should be together 1052493c6be3SSridhar Samudrala */ 1053493c6be3SSridhar Samudrala offset = skb_transport_offset(skb); 1054493c6be3SSridhar Samudrala skb->csum = skb_checksum(skb, offset, skb->len - offset, 0); 1055493c6be3SSridhar Samudrala 1056493c6be3SSridhar Samudrala skb->ip_summed = CHECKSUM_NONE; 1057493c6be3SSridhar Samudrala 1058d39d938cSVlad Yasevich do { 1059d39d938cSVlad Yasevich csum = csum_add(csum, frags->csum); 1060d39d938cSVlad Yasevich } while ((frags = frags->next)); 1061493c6be3SSridhar Samudrala 1062493c6be3SSridhar Samudrala uh->check = csum_ipv6_magic(saddr, daddr, len, IPPROTO_UDP, 1063493c6be3SSridhar Samudrala csum); 1064493c6be3SSridhar Samudrala if (uh->check == 0) 1065493c6be3SSridhar Samudrala uh->check = CSUM_MANGLED_0; 1066493c6be3SSridhar Samudrala } 1067493c6be3SSridhar Samudrala } 1068493c6be3SSridhar Samudrala 1069db8dac20SDavid S. Miller /* 1070db8dac20SDavid S. Miller * Sending 1071db8dac20SDavid S. Miller */ 1072db8dac20SDavid S. Miller 1073d39d938cSVlad Yasevich static int udp_v6_send_skb(struct sk_buff *skb, struct flowi6 *fl6) 1074db8dac20SDavid S. Miller { 1075d39d938cSVlad Yasevich struct sock *sk = skb->sk; 1076db8dac20SDavid S. Miller struct udphdr *uh; 1077db8dac20SDavid S. Miller int err = 0; 1078db8dac20SDavid S. Miller int is_udplite = IS_UDPLITE(sk); 1079db8dac20SDavid S. Miller __wsum csum = 0; 1080d39d938cSVlad Yasevich int offset = skb_transport_offset(skb); 1081d39d938cSVlad Yasevich int len = skb->len - offset; 1082db8dac20SDavid S. Miller 1083db8dac20SDavid S. Miller /* 1084db8dac20SDavid S. Miller * Create a UDP header 1085db8dac20SDavid S. Miller */ 1086db8dac20SDavid S. Miller uh = udp_hdr(skb); 10871958b856SDavid S. Miller uh->source = fl6->fl6_sport; 10881958b856SDavid S. Miller uh->dest = fl6->fl6_dport; 1089d39d938cSVlad Yasevich uh->len = htons(len); 1090db8dac20SDavid S. Miller uh->check = 0; 1091db8dac20SDavid S. Miller 1092db8dac20SDavid S. Miller if (is_udplite) 1093d39d938cSVlad Yasevich csum = udplite_csum(skb); 1094d39d938cSVlad Yasevich else if (udp_sk(sk)->no_check6_tx) { /* UDP csum disabled */ 10954068579eSTom Herbert skb->ip_summed = CHECKSUM_NONE; 10964068579eSTom Herbert goto send; 10974068579eSTom Herbert } else if (skb->ip_summed == CHECKSUM_PARTIAL) { /* UDP hardware csum */ 1098d39d938cSVlad Yasevich udp6_hwcsum_outgoing(sk, skb, &fl6->saddr, &fl6->daddr, len); 1099493c6be3SSridhar Samudrala goto send; 1100493c6be3SSridhar Samudrala } else 1101d39d938cSVlad Yasevich csum = udp_csum(skb); 1102db8dac20SDavid S. Miller 1103db8dac20SDavid S. Miller /* add protocol-dependent pseudo-header */ 11044c9483b2SDavid S. Miller uh->check = csum_ipv6_magic(&fl6->saddr, &fl6->daddr, 1105d39d938cSVlad Yasevich len, fl6->flowi6_proto, csum); 1106db8dac20SDavid S. Miller if (uh->check == 0) 1107db8dac20SDavid S. Miller uh->check = CSUM_MANGLED_0; 1108db8dac20SDavid S. Miller 1109493c6be3SSridhar Samudrala send: 1110d39d938cSVlad Yasevich err = ip6_send_skb(skb); 11116ce9e7b5SEric Dumazet if (err) { 11126ce9e7b5SEric Dumazet if (err == -ENOBUFS && !inet6_sk(sk)->recverr) { 11136ce9e7b5SEric Dumazet UDP6_INC_STATS_USER(sock_net(sk), 11146ce9e7b5SEric Dumazet UDP_MIB_SNDBUFERRORS, is_udplite); 11156ce9e7b5SEric Dumazet err = 0; 11166ce9e7b5SEric Dumazet } 11176ce9e7b5SEric Dumazet } else 11186ce9e7b5SEric Dumazet UDP6_INC_STATS_USER(sock_net(sk), 11196ce9e7b5SEric Dumazet UDP_MIB_OUTDATAGRAMS, is_udplite); 1120d39d938cSVlad Yasevich return err; 1121d39d938cSVlad Yasevich } 1122d39d938cSVlad Yasevich 1123d39d938cSVlad Yasevich static int udp_v6_push_pending_frames(struct sock *sk) 1124d39d938cSVlad Yasevich { 1125d39d938cSVlad Yasevich struct sk_buff *skb; 1126d39d938cSVlad Yasevich struct udp_sock *up = udp_sk(sk); 1127d39d938cSVlad Yasevich struct flowi6 fl6; 1128d39d938cSVlad Yasevich int err = 0; 1129d39d938cSVlad Yasevich 1130d39d938cSVlad Yasevich if (up->pending == AF_INET) 1131d39d938cSVlad Yasevich return udp_push_pending_frames(sk); 1132d39d938cSVlad Yasevich 1133d39d938cSVlad Yasevich /* ip6_finish_skb will release the cork, so make a copy of 1134d39d938cSVlad Yasevich * fl6 here. 1135d39d938cSVlad Yasevich */ 1136d39d938cSVlad Yasevich fl6 = inet_sk(sk)->cork.fl.u.ip6; 1137d39d938cSVlad Yasevich 1138d39d938cSVlad Yasevich skb = ip6_finish_skb(sk); 1139d39d938cSVlad Yasevich if (!skb) 1140d39d938cSVlad Yasevich goto out; 1141d39d938cSVlad Yasevich 1142d39d938cSVlad Yasevich err = udp_v6_send_skb(skb, &fl6); 1143d39d938cSVlad Yasevich 1144db8dac20SDavid S. Miller out: 1145db8dac20SDavid S. Miller up->len = 0; 1146db8dac20SDavid S. Miller up->pending = 0; 1147db8dac20SDavid S. Miller return err; 1148db8dac20SDavid S. Miller } 1149db8dac20SDavid S. Miller 11501b784140SYing Xue int udpv6_sendmsg(struct sock *sk, struct msghdr *msg, size_t len) 1151db8dac20SDavid S. Miller { 1152db8dac20SDavid S. Miller struct ipv6_txoptions opt_space; 1153db8dac20SDavid S. Miller struct udp_sock *up = udp_sk(sk); 1154db8dac20SDavid S. Miller struct inet_sock *inet = inet_sk(sk); 1155db8dac20SDavid S. Miller struct ipv6_pinfo *np = inet6_sk(sk); 1156342dfc30SSteffen Hurrle DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, msg->msg_name); 115720c59de2SArnaud Ebalard struct in6_addr *daddr, *final_p, final; 1158db8dac20SDavid S. Miller struct ipv6_txoptions *opt = NULL; 115945f6fad8SEric Dumazet struct ipv6_txoptions *opt_to_free = NULL; 1160db8dac20SDavid S. Miller struct ip6_flowlabel *flowlabel = NULL; 11614c9483b2SDavid S. Miller struct flowi6 fl6; 1162db8dac20SDavid S. Miller struct dst_entry *dst; 1163db8dac20SDavid S. Miller int addr_len = msg->msg_namelen; 1164db8dac20SDavid S. Miller int ulen = len; 1165db8dac20SDavid S. Miller int hlimit = -1; 1166db8dac20SDavid S. Miller int tclass = -1; 116713b52cd4SBrian Haley int dontfrag = -1; 1168db8dac20SDavid S. Miller int corkreq = up->corkflag || msg->msg_flags&MSG_MORE; 1169db8dac20SDavid S. Miller int err; 1170db8dac20SDavid S. Miller int connected = 0; 1171db8dac20SDavid S. Miller int is_udplite = IS_UDPLITE(sk); 1172db8dac20SDavid S. Miller int (*getfrag)(void *, char *, int, int, int, struct sk_buff *); 1173db8dac20SDavid S. Miller 1174db8dac20SDavid S. Miller /* destination address check */ 1175db8dac20SDavid S. Miller if (sin6) { 1176db8dac20SDavid S. Miller if (addr_len < offsetof(struct sockaddr, sa_data)) 1177db8dac20SDavid S. Miller return -EINVAL; 1178db8dac20SDavid S. Miller 1179db8dac20SDavid S. Miller switch (sin6->sin6_family) { 1180db8dac20SDavid S. Miller case AF_INET6: 1181db8dac20SDavid S. Miller if (addr_len < SIN6_LEN_RFC2133) 1182db8dac20SDavid S. Miller return -EINVAL; 1183db8dac20SDavid S. Miller daddr = &sin6->sin6_addr; 1184db8dac20SDavid S. Miller break; 1185db8dac20SDavid S. Miller case AF_INET: 1186db8dac20SDavid S. Miller goto do_udp_sendmsg; 1187db8dac20SDavid S. Miller case AF_UNSPEC: 1188db8dac20SDavid S. Miller msg->msg_name = sin6 = NULL; 1189db8dac20SDavid S. Miller msg->msg_namelen = addr_len = 0; 1190db8dac20SDavid S. Miller daddr = NULL; 1191db8dac20SDavid S. Miller break; 1192db8dac20SDavid S. Miller default: 1193db8dac20SDavid S. Miller return -EINVAL; 1194db8dac20SDavid S. Miller } 1195db8dac20SDavid S. Miller } else if (!up->pending) { 1196db8dac20SDavid S. Miller if (sk->sk_state != TCP_ESTABLISHED) 1197db8dac20SDavid S. Miller return -EDESTADDRREQ; 1198efe4208fSEric Dumazet daddr = &sk->sk_v6_daddr; 1199db8dac20SDavid S. Miller } else 1200db8dac20SDavid S. Miller daddr = NULL; 1201db8dac20SDavid S. Miller 1202db8dac20SDavid S. Miller if (daddr) { 1203db8dac20SDavid S. Miller if (ipv6_addr_v4mapped(daddr)) { 1204db8dac20SDavid S. Miller struct sockaddr_in sin; 1205db8dac20SDavid S. Miller sin.sin_family = AF_INET; 1206c720c7e8SEric Dumazet sin.sin_port = sin6 ? sin6->sin6_port : inet->inet_dport; 1207db8dac20SDavid S. Miller sin.sin_addr.s_addr = daddr->s6_addr32[3]; 1208db8dac20SDavid S. Miller msg->msg_name = &sin; 1209db8dac20SDavid S. Miller msg->msg_namelen = sizeof(sin); 1210db8dac20SDavid S. Miller do_udp_sendmsg: 1211db8dac20SDavid S. Miller if (__ipv6_only_sock(sk)) 1212db8dac20SDavid S. Miller return -ENETUNREACH; 12131b784140SYing Xue return udp_sendmsg(sk, msg, len); 1214db8dac20SDavid S. Miller } 1215db8dac20SDavid S. Miller } 1216db8dac20SDavid S. Miller 1217db8dac20SDavid S. Miller if (up->pending == AF_INET) 12181b784140SYing Xue return udp_sendmsg(sk, msg, len); 1219db8dac20SDavid S. Miller 1220db8dac20SDavid S. Miller /* Rough check on arithmetic overflow, 1221db8dac20SDavid S. Miller better check is made in ip6_append_data(). 1222db8dac20SDavid S. Miller */ 1223db8dac20SDavid S. Miller if (len > INT_MAX - sizeof(struct udphdr)) 1224db8dac20SDavid S. Miller return -EMSGSIZE; 1225db8dac20SDavid S. Miller 122603485f2aSVlad Yasevich getfrag = is_udplite ? udplite_getfrag : ip_generic_getfrag; 1227db8dac20SDavid S. Miller if (up->pending) { 1228db8dac20SDavid S. Miller /* 1229db8dac20SDavid S. Miller * There are pending frames. 1230db8dac20SDavid S. Miller * The socket lock must be held while it's corked. 1231db8dac20SDavid S. Miller */ 1232db8dac20SDavid S. Miller lock_sock(sk); 1233db8dac20SDavid S. Miller if (likely(up->pending)) { 1234db8dac20SDavid S. Miller if (unlikely(up->pending != AF_INET6)) { 1235db8dac20SDavid S. Miller release_sock(sk); 1236db8dac20SDavid S. Miller return -EAFNOSUPPORT; 1237db8dac20SDavid S. Miller } 1238db8dac20SDavid S. Miller dst = NULL; 1239db8dac20SDavid S. Miller goto do_append_data; 1240db8dac20SDavid S. Miller } 1241db8dac20SDavid S. Miller release_sock(sk); 1242db8dac20SDavid S. Miller } 1243db8dac20SDavid S. Miller ulen += sizeof(struct udphdr); 1244db8dac20SDavid S. Miller 12454c9483b2SDavid S. Miller memset(&fl6, 0, sizeof(fl6)); 1246db8dac20SDavid S. Miller 1247db8dac20SDavid S. Miller if (sin6) { 1248db8dac20SDavid S. Miller if (sin6->sin6_port == 0) 1249db8dac20SDavid S. Miller return -EINVAL; 1250db8dac20SDavid S. Miller 12511958b856SDavid S. Miller fl6.fl6_dport = sin6->sin6_port; 1252db8dac20SDavid S. Miller daddr = &sin6->sin6_addr; 1253db8dac20SDavid S. Miller 1254db8dac20SDavid S. Miller if (np->sndflow) { 12554c9483b2SDavid S. Miller fl6.flowlabel = sin6->sin6_flowinfo&IPV6_FLOWINFO_MASK; 12564c9483b2SDavid S. Miller if (fl6.flowlabel&IPV6_FLOWLABEL_MASK) { 12574c9483b2SDavid S. Miller flowlabel = fl6_sock_lookup(sk, fl6.flowlabel); 125863159f29SIan Morris if (!flowlabel) 1259db8dac20SDavid S. Miller return -EINVAL; 1260db8dac20SDavid S. Miller } 1261db8dac20SDavid S. Miller } 1262db8dac20SDavid S. Miller 1263db8dac20SDavid S. Miller /* 1264db8dac20SDavid S. Miller * Otherwise it will be difficult to maintain 1265db8dac20SDavid S. Miller * sk->sk_dst_cache. 1266db8dac20SDavid S. Miller */ 1267db8dac20SDavid S. Miller if (sk->sk_state == TCP_ESTABLISHED && 1268efe4208fSEric Dumazet ipv6_addr_equal(daddr, &sk->sk_v6_daddr)) 1269efe4208fSEric Dumazet daddr = &sk->sk_v6_daddr; 1270db8dac20SDavid S. Miller 1271db8dac20SDavid S. Miller if (addr_len >= sizeof(struct sockaddr_in6) && 1272db8dac20SDavid S. Miller sin6->sin6_scope_id && 1273842df073SHannes Frederic Sowa __ipv6_addr_needs_scope_id(__ipv6_addr_type(daddr))) 12744c9483b2SDavid S. Miller fl6.flowi6_oif = sin6->sin6_scope_id; 1275db8dac20SDavid S. Miller } else { 1276db8dac20SDavid S. Miller if (sk->sk_state != TCP_ESTABLISHED) 1277db8dac20SDavid S. Miller return -EDESTADDRREQ; 1278db8dac20SDavid S. Miller 12791958b856SDavid S. Miller fl6.fl6_dport = inet->inet_dport; 1280efe4208fSEric Dumazet daddr = &sk->sk_v6_daddr; 12814c9483b2SDavid S. Miller fl6.flowlabel = np->flow_label; 1282db8dac20SDavid S. Miller connected = 1; 1283db8dac20SDavid S. Miller } 1284db8dac20SDavid S. Miller 12854c9483b2SDavid S. Miller if (!fl6.flowi6_oif) 12864c9483b2SDavid S. Miller fl6.flowi6_oif = sk->sk_bound_dev_if; 1287db8dac20SDavid S. Miller 12884c9483b2SDavid S. Miller if (!fl6.flowi6_oif) 12894c9483b2SDavid S. Miller fl6.flowi6_oif = np->sticky_pktinfo.ipi6_ifindex; 12909f690db7SYang Hongyang 12914c9483b2SDavid S. Miller fl6.flowi6_mark = sk->sk_mark; 129251953d5bSBrian Haley 1293db8dac20SDavid S. Miller if (msg->msg_controllen) { 1294db8dac20SDavid S. Miller opt = &opt_space; 1295db8dac20SDavid S. Miller memset(opt, 0, sizeof(struct ipv6_txoptions)); 1296db8dac20SDavid S. Miller opt->tot_len = sizeof(*opt); 1297db8dac20SDavid S. Miller 129873df66f8STom Parkin err = ip6_datagram_send_ctl(sock_net(sk), sk, msg, &fl6, opt, 1299ec0506dbSMaciej Żenczykowski &hlimit, &tclass, &dontfrag); 1300db8dac20SDavid S. Miller if (err < 0) { 1301db8dac20SDavid S. Miller fl6_sock_release(flowlabel); 1302db8dac20SDavid S. Miller return err; 1303db8dac20SDavid S. Miller } 13044c9483b2SDavid S. Miller if ((fl6.flowlabel&IPV6_FLOWLABEL_MASK) && !flowlabel) { 13054c9483b2SDavid S. Miller flowlabel = fl6_sock_lookup(sk, fl6.flowlabel); 130663159f29SIan Morris if (!flowlabel) 1307db8dac20SDavid S. Miller return -EINVAL; 1308db8dac20SDavid S. Miller } 1309db8dac20SDavid S. Miller if (!(opt->opt_nflen|opt->opt_flen)) 1310db8dac20SDavid S. Miller opt = NULL; 1311db8dac20SDavid S. Miller connected = 0; 1312db8dac20SDavid S. Miller } 131345f6fad8SEric Dumazet if (!opt) { 131445f6fad8SEric Dumazet opt = txopt_get(np); 131545f6fad8SEric Dumazet opt_to_free = opt; 131645f6fad8SEric Dumazet } 1317db8dac20SDavid S. Miller if (flowlabel) 1318db8dac20SDavid S. Miller opt = fl6_merge_options(&opt_space, flowlabel, opt); 1319db8dac20SDavid S. Miller opt = ipv6_fixup_options(&opt_space, opt); 1320db8dac20SDavid S. Miller 13214c9483b2SDavid S. Miller fl6.flowi6_proto = sk->sk_protocol; 1322876c7f41SBrian Haley if (!ipv6_addr_any(daddr)) 13234e3fd7a0SAlexey Dobriyan fl6.daddr = *daddr; 1324876c7f41SBrian Haley else 13254c9483b2SDavid S. Miller fl6.daddr.s6_addr[15] = 0x1; /* :: means loopback (BSD'ism) */ 13264c9483b2SDavid S. Miller if (ipv6_addr_any(&fl6.saddr) && !ipv6_addr_any(&np->saddr)) 13274e3fd7a0SAlexey Dobriyan fl6.saddr = np->saddr; 13281958b856SDavid S. Miller fl6.fl6_sport = inet->inet_sport; 1329db8dac20SDavid S. Miller 13304c9483b2SDavid S. Miller final_p = fl6_update_dst(&fl6, opt, &final); 133120c59de2SArnaud Ebalard if (final_p) 1332db8dac20SDavid S. Miller connected = 0; 1333db8dac20SDavid S. Miller 13344c9483b2SDavid S. Miller if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr)) { 13354c9483b2SDavid S. Miller fl6.flowi6_oif = np->mcast_oif; 1336db8dac20SDavid S. Miller connected = 0; 1337c4062dfcSErich E. Hoover } else if (!fl6.flowi6_oif) 1338c4062dfcSErich E. Hoover fl6.flowi6_oif = np->ucast_oif; 1339db8dac20SDavid S. Miller 13404c9483b2SDavid S. Miller security_sk_classify_flow(sk, flowi6_to_flowi(&fl6)); 1341db8dac20SDavid S. Miller 13420e0d44abSSteffen Klassert dst = ip6_sk_dst_lookup_flow(sk, &fl6, final_p); 134368d0c6d3SDavid S. Miller if (IS_ERR(dst)) { 134468d0c6d3SDavid S. Miller err = PTR_ERR(dst); 134568d0c6d3SDavid S. Miller dst = NULL; 1346db8dac20SDavid S. Miller goto out; 1347db8dac20SDavid S. Miller } 1348db8dac20SDavid S. Miller 1349db8dac20SDavid S. Miller if (hlimit < 0) 13505c98631cSLorenzo Colitti hlimit = ip6_sk_dst_hoplimit(np, &fl6, dst); 1351db8dac20SDavid S. Miller 1352db8dac20SDavid S. Miller if (tclass < 0) 1353e651f03aSGerrit Renker tclass = np->tclass; 1354db8dac20SDavid S. Miller 1355db8dac20SDavid S. Miller if (msg->msg_flags&MSG_CONFIRM) 1356db8dac20SDavid S. Miller goto do_confirm; 1357db8dac20SDavid S. Miller back_from_confirm: 1358db8dac20SDavid S. Miller 135903485f2aSVlad Yasevich /* Lockless fast path for the non-corking case */ 136003485f2aSVlad Yasevich if (!corkreq) { 136103485f2aSVlad Yasevich struct sk_buff *skb; 136203485f2aSVlad Yasevich 136303485f2aSVlad Yasevich skb = ip6_make_skb(sk, getfrag, msg, ulen, 136403485f2aSVlad Yasevich sizeof(struct udphdr), hlimit, tclass, opt, 136503485f2aSVlad Yasevich &fl6, (struct rt6_info *)dst, 136603485f2aSVlad Yasevich msg->msg_flags, dontfrag); 136703485f2aSVlad Yasevich err = PTR_ERR(skb); 136803485f2aSVlad Yasevich if (!IS_ERR_OR_NULL(skb)) 136903485f2aSVlad Yasevich err = udp_v6_send_skb(skb, &fl6); 137003485f2aSVlad Yasevich goto release_dst; 137103485f2aSVlad Yasevich } 137203485f2aSVlad Yasevich 1373db8dac20SDavid S. Miller lock_sock(sk); 1374db8dac20SDavid S. Miller if (unlikely(up->pending)) { 1375db8dac20SDavid S. Miller /* The socket is already corked while preparing it. */ 1376db8dac20SDavid S. Miller /* ... which is an evident application bug. --ANK */ 1377db8dac20SDavid S. Miller release_sock(sk); 1378db8dac20SDavid S. Miller 1379ba7a46f1SJoe Perches net_dbg_ratelimited("udp cork app bug 2\n"); 1380db8dac20SDavid S. Miller err = -EINVAL; 1381db8dac20SDavid S. Miller goto out; 1382db8dac20SDavid S. Miller } 1383db8dac20SDavid S. Miller 1384db8dac20SDavid S. Miller up->pending = AF_INET6; 1385db8dac20SDavid S. Miller 1386db8dac20SDavid S. Miller do_append_data: 1387e36d3ff9SJiri Pirko if (dontfrag < 0) 1388e36d3ff9SJiri Pirko dontfrag = np->dontfrag; 1389db8dac20SDavid S. Miller up->len += ulen; 1390f69e6d13SAl Viro err = ip6_append_data(sk, getfrag, msg, ulen, 13914c9483b2SDavid S. Miller sizeof(struct udphdr), hlimit, tclass, opt, &fl6, 1392db8dac20SDavid S. Miller (struct rt6_info *)dst, 139313b52cd4SBrian Haley corkreq ? msg->msg_flags|MSG_MORE : msg->msg_flags, dontfrag); 1394db8dac20SDavid S. Miller if (err) 1395db8dac20SDavid S. Miller udp_v6_flush_pending_frames(sk); 1396db8dac20SDavid S. Miller else if (!corkreq) 1397db8dac20SDavid S. Miller err = udp_v6_push_pending_frames(sk); 1398db8dac20SDavid S. Miller else if (unlikely(skb_queue_empty(&sk->sk_write_queue))) 1399db8dac20SDavid S. Miller up->pending = 0; 1400db8dac20SDavid S. Miller 140103485f2aSVlad Yasevich if (err > 0) 140203485f2aSVlad Yasevich err = np->recverr ? net_xmit_errno(err) : 0; 140303485f2aSVlad Yasevich release_sock(sk); 140403485f2aSVlad Yasevich 140503485f2aSVlad Yasevich release_dst: 1406db8dac20SDavid S. Miller if (dst) { 1407db8dac20SDavid S. Miller if (connected) { 1408db8dac20SDavid S. Miller ip6_dst_store(sk, dst, 1409efe4208fSEric Dumazet ipv6_addr_equal(&fl6.daddr, &sk->sk_v6_daddr) ? 1410efe4208fSEric Dumazet &sk->sk_v6_daddr : NULL, 1411db8dac20SDavid S. Miller #ifdef CONFIG_IPV6_SUBTREES 14124c9483b2SDavid S. Miller ipv6_addr_equal(&fl6.saddr, &np->saddr) ? 1413db8dac20SDavid S. Miller &np->saddr : 1414db8dac20SDavid S. Miller #endif 1415db8dac20SDavid S. Miller NULL); 1416db8dac20SDavid S. Miller } else { 1417db8dac20SDavid S. Miller dst_release(dst); 1418db8dac20SDavid S. Miller } 1419a3c96089SYOSHIFUJI Hideaki dst = NULL; 1420db8dac20SDavid S. Miller } 1421db8dac20SDavid S. Miller 1422db8dac20SDavid S. Miller out: 1423a3c96089SYOSHIFUJI Hideaki dst_release(dst); 1424db8dac20SDavid S. Miller fl6_sock_release(flowlabel); 142545f6fad8SEric Dumazet txopt_put(opt_to_free); 1426db8dac20SDavid S. Miller if (!err) 1427db8dac20SDavid S. Miller return len; 1428db8dac20SDavid S. Miller /* 1429db8dac20SDavid S. Miller * ENOBUFS = no kernel mem, SOCK_NOSPACE = no sndbuf space. Reporting 1430db8dac20SDavid S. Miller * ENOBUFS might not be good (it's not tunable per se), but otherwise 1431db8dac20SDavid S. Miller * we don't have a good statistic (IpOutDiscards but it can be too many 1432db8dac20SDavid S. Miller * things). We could add another new stat but at least for now that 1433db8dac20SDavid S. Miller * seems like overkill. 1434db8dac20SDavid S. Miller */ 1435db8dac20SDavid S. Miller if (err == -ENOBUFS || test_bit(SOCK_NOSPACE, &sk->sk_socket->flags)) { 1436235b9f7aSPavel Emelyanov UDP6_INC_STATS_USER(sock_net(sk), 1437235b9f7aSPavel Emelyanov UDP_MIB_SNDBUFERRORS, is_udplite); 1438db8dac20SDavid S. Miller } 1439db8dac20SDavid S. Miller return err; 1440db8dac20SDavid S. Miller 1441db8dac20SDavid S. Miller do_confirm: 1442db8dac20SDavid S. Miller dst_confirm(dst); 1443db8dac20SDavid S. Miller if (!(msg->msg_flags&MSG_PROBE) || len) 1444db8dac20SDavid S. Miller goto back_from_confirm; 1445db8dac20SDavid S. Miller err = 0; 1446db8dac20SDavid S. Miller goto out; 1447db8dac20SDavid S. Miller } 1448db8dac20SDavid S. Miller 14497d06b2e0SBrian Haley void udpv6_destroy_sock(struct sock *sk) 1450db8dac20SDavid S. Miller { 145144046a59STom Parkin struct udp_sock *up = udp_sk(sk); 1452db8dac20SDavid S. Miller lock_sock(sk); 1453db8dac20SDavid S. Miller udp_v6_flush_pending_frames(sk); 1454db8dac20SDavid S. Miller release_sock(sk); 1455db8dac20SDavid S. Miller 145644046a59STom Parkin if (static_key_false(&udpv6_encap_needed) && up->encap_type) { 145744046a59STom Parkin void (*encap_destroy)(struct sock *sk); 145844046a59STom Parkin encap_destroy = ACCESS_ONCE(up->encap_destroy); 145944046a59STom Parkin if (encap_destroy) 146044046a59STom Parkin encap_destroy(sk); 146144046a59STom Parkin } 146244046a59STom Parkin 1463db8dac20SDavid S. Miller inet6_destroy_sock(sk); 1464db8dac20SDavid S. Miller } 1465db8dac20SDavid S. Miller 1466db8dac20SDavid S. Miller /* 1467db8dac20SDavid S. Miller * Socket option code for UDP 1468db8dac20SDavid S. Miller */ 1469db8dac20SDavid S. Miller int udpv6_setsockopt(struct sock *sk, int level, int optname, 1470b7058842SDavid S. Miller char __user *optval, unsigned int optlen) 1471db8dac20SDavid S. Miller { 1472db8dac20SDavid S. Miller if (level == SOL_UDP || level == SOL_UDPLITE) 1473db8dac20SDavid S. Miller return udp_lib_setsockopt(sk, level, optname, optval, optlen, 1474db8dac20SDavid S. Miller udp_v6_push_pending_frames); 1475db8dac20SDavid S. Miller return ipv6_setsockopt(sk, level, optname, optval, optlen); 1476db8dac20SDavid S. Miller } 1477db8dac20SDavid S. Miller 1478db8dac20SDavid S. Miller #ifdef CONFIG_COMPAT 1479db8dac20SDavid S. Miller int compat_udpv6_setsockopt(struct sock *sk, int level, int optname, 1480b7058842SDavid S. Miller char __user *optval, unsigned int optlen) 1481db8dac20SDavid S. Miller { 1482db8dac20SDavid S. Miller if (level == SOL_UDP || level == SOL_UDPLITE) 1483db8dac20SDavid S. Miller return udp_lib_setsockopt(sk, level, optname, optval, optlen, 1484db8dac20SDavid S. Miller udp_v6_push_pending_frames); 1485db8dac20SDavid S. Miller return compat_ipv6_setsockopt(sk, level, optname, optval, optlen); 1486db8dac20SDavid S. Miller } 1487db8dac20SDavid S. Miller #endif 1488db8dac20SDavid S. Miller 1489db8dac20SDavid S. Miller int udpv6_getsockopt(struct sock *sk, int level, int optname, 1490db8dac20SDavid S. Miller char __user *optval, int __user *optlen) 1491db8dac20SDavid S. Miller { 1492db8dac20SDavid S. Miller if (level == SOL_UDP || level == SOL_UDPLITE) 1493db8dac20SDavid S. Miller return udp_lib_getsockopt(sk, level, optname, optval, optlen); 1494db8dac20SDavid S. Miller return ipv6_getsockopt(sk, level, optname, optval, optlen); 1495db8dac20SDavid S. Miller } 1496db8dac20SDavid S. Miller 1497db8dac20SDavid S. Miller #ifdef CONFIG_COMPAT 1498db8dac20SDavid S. Miller int compat_udpv6_getsockopt(struct sock *sk, int level, int optname, 1499db8dac20SDavid S. Miller char __user *optval, int __user *optlen) 1500db8dac20SDavid S. Miller { 1501db8dac20SDavid S. Miller if (level == SOL_UDP || level == SOL_UDPLITE) 1502db8dac20SDavid S. Miller return udp_lib_getsockopt(sk, level, optname, optval, optlen); 1503db8dac20SDavid S. Miller return compat_ipv6_getsockopt(sk, level, optname, optval, optlen); 1504db8dac20SDavid S. Miller } 1505db8dac20SDavid S. Miller #endif 1506db8dac20SDavid S. Miller 150741135cc8SAlexey Dobriyan static const struct inet6_protocol udpv6_protocol = { 1508db8dac20SDavid S. Miller .handler = udpv6_rcv, 1509db8dac20SDavid S. Miller .err_handler = udpv6_err, 1510db8dac20SDavid S. Miller .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL, 1511db8dac20SDavid S. Miller }; 1512db8dac20SDavid S. Miller 1513db8dac20SDavid S. Miller /* ------------------------------------------------------------------------ */ 1514db8dac20SDavid S. Miller #ifdef CONFIG_PROC_FS 1515db8dac20SDavid S. Miller int udp6_seq_show(struct seq_file *seq, void *v) 1516db8dac20SDavid S. Miller { 151717ef66afSLorenzo Colitti if (v == SEQ_START_TOKEN) { 151817ef66afSLorenzo Colitti seq_puts(seq, IPV6_SEQ_DGRAM_HEADER); 151917ef66afSLorenzo Colitti } else { 152017ef66afSLorenzo Colitti int bucket = ((struct udp_iter_state *)seq->private)->bucket; 152117ef66afSLorenzo Colitti struct inet_sock *inet = inet_sk(v); 152217ef66afSLorenzo Colitti __u16 srcp = ntohs(inet->inet_sport); 152317ef66afSLorenzo Colitti __u16 destp = ntohs(inet->inet_dport); 152417ef66afSLorenzo Colitti ip6_dgram_sock_seq_show(seq, v, srcp, destp, bucket); 152517ef66afSLorenzo Colitti } 1526db8dac20SDavid S. Miller return 0; 1527db8dac20SDavid S. Miller } 1528db8dac20SDavid S. Miller 152973cb88ecSArjan van de Ven static const struct file_operations udp6_afinfo_seq_fops = { 153073cb88ecSArjan van de Ven .owner = THIS_MODULE, 153173cb88ecSArjan van de Ven .open = udp_seq_open, 153273cb88ecSArjan van de Ven .read = seq_read, 153373cb88ecSArjan van de Ven .llseek = seq_lseek, 153473cb88ecSArjan van de Ven .release = seq_release_net 153573cb88ecSArjan van de Ven }; 153673cb88ecSArjan van de Ven 1537db8dac20SDavid S. Miller static struct udp_seq_afinfo udp6_seq_afinfo = { 1538db8dac20SDavid S. Miller .name = "udp6", 1539db8dac20SDavid S. Miller .family = AF_INET6, 1540645ca708SEric Dumazet .udp_table = &udp_table, 154173cb88ecSArjan van de Ven .seq_fops = &udp6_afinfo_seq_fops, 1542dda61925SDenis V. Lunev .seq_ops = { 1543dda61925SDenis V. Lunev .show = udp6_seq_show, 1544dda61925SDenis V. Lunev }, 1545db8dac20SDavid S. Miller }; 1546db8dac20SDavid S. Miller 15472c8c1e72SAlexey Dobriyan int __net_init udp6_proc_init(struct net *net) 1548db8dac20SDavid S. Miller { 15490c96d8c5SDaniel Lezcano return udp_proc_register(net, &udp6_seq_afinfo); 1550db8dac20SDavid S. Miller } 1551db8dac20SDavid S. Miller 1552ec120da6SIan Morris void udp6_proc_exit(struct net *net) 1553ec120da6SIan Morris { 15540c96d8c5SDaniel Lezcano udp_proc_unregister(net, &udp6_seq_afinfo); 1555db8dac20SDavid S. Miller } 1556db8dac20SDavid S. Miller #endif /* CONFIG_PROC_FS */ 1557db8dac20SDavid S. Miller 1558f77d6021SEric Dumazet void udp_v6_clear_sk(struct sock *sk, int size) 1559f77d6021SEric Dumazet { 1560f77d6021SEric Dumazet struct inet_sock *inet = inet_sk(sk); 1561f77d6021SEric Dumazet 1562f77d6021SEric Dumazet /* we do not want to clear pinet6 field, because of RCU lookups */ 1563f77d6021SEric Dumazet sk_prot_clear_portaddr_nulls(sk, offsetof(struct inet_sock, pinet6)); 1564f77d6021SEric Dumazet 1565f77d6021SEric Dumazet size -= offsetof(struct inet_sock, pinet6) + sizeof(inet->pinet6); 1566f77d6021SEric Dumazet memset(&inet->pinet6 + 1, 0, size); 1567f77d6021SEric Dumazet } 1568f77d6021SEric Dumazet 1569db8dac20SDavid S. Miller /* ------------------------------------------------------------------------ */ 1570db8dac20SDavid S. Miller 1571db8dac20SDavid S. Miller struct proto udpv6_prot = { 1572db8dac20SDavid S. Miller .name = "UDPv6", 1573db8dac20SDavid S. Miller .owner = THIS_MODULE, 1574db8dac20SDavid S. Miller .close = udp_lib_close, 1575db8dac20SDavid S. Miller .connect = ip6_datagram_connect, 1576db8dac20SDavid S. Miller .disconnect = udp_disconnect, 1577db8dac20SDavid S. Miller .ioctl = udp_ioctl, 1578db8dac20SDavid S. Miller .destroy = udpv6_destroy_sock, 1579db8dac20SDavid S. Miller .setsockopt = udpv6_setsockopt, 1580db8dac20SDavid S. Miller .getsockopt = udpv6_getsockopt, 1581db8dac20SDavid S. Miller .sendmsg = udpv6_sendmsg, 1582db8dac20SDavid S. Miller .recvmsg = udpv6_recvmsg, 1583f7ad74feSBenjamin LaHaise .backlog_rcv = __udpv6_queue_rcv_skb, 1584db8dac20SDavid S. Miller .hash = udp_lib_hash, 1585db8dac20SDavid S. Miller .unhash = udp_lib_unhash, 1586719f8358SEric Dumazet .rehash = udp_v6_rehash, 1587db8dac20SDavid S. Miller .get_port = udp_v6_get_port, 1588db8dac20SDavid S. Miller .memory_allocated = &udp_memory_allocated, 1589db8dac20SDavid S. Miller .sysctl_mem = sysctl_udp_mem, 1590db8dac20SDavid S. Miller .sysctl_wmem = &sysctl_udp_wmem_min, 1591db8dac20SDavid S. Miller .sysctl_rmem = &sysctl_udp_rmem_min, 1592db8dac20SDavid S. Miller .obj_size = sizeof(struct udp6_sock), 1593271b72c7SEric Dumazet .slab_flags = SLAB_DESTROY_BY_RCU, 1594645ca708SEric Dumazet .h.udp_table = &udp_table, 1595db8dac20SDavid S. Miller #ifdef CONFIG_COMPAT 1596db8dac20SDavid S. Miller .compat_setsockopt = compat_udpv6_setsockopt, 1597db8dac20SDavid S. Miller .compat_getsockopt = compat_udpv6_getsockopt, 1598db8dac20SDavid S. Miller #endif 1599f77d6021SEric Dumazet .clear_sk = udp_v6_clear_sk, 1600db8dac20SDavid S. Miller }; 1601db8dac20SDavid S. Miller 1602db8dac20SDavid S. Miller static struct inet_protosw udpv6_protosw = { 1603db8dac20SDavid S. Miller .type = SOCK_DGRAM, 1604db8dac20SDavid S. Miller .protocol = IPPROTO_UDP, 1605db8dac20SDavid S. Miller .prot = &udpv6_prot, 1606db8dac20SDavid S. Miller .ops = &inet6_dgram_ops, 1607db8dac20SDavid S. Miller .flags = INET_PROTOSW_PERMANENT, 1608db8dac20SDavid S. Miller }; 1609db8dac20SDavid S. Miller 1610db8dac20SDavid S. Miller int __init udpv6_init(void) 1611db8dac20SDavid S. Miller { 1612db8dac20SDavid S. Miller int ret; 1613db8dac20SDavid S. Miller 16143336288aSVlad Yasevich ret = inet6_add_protocol(&udpv6_protocol, IPPROTO_UDP); 16153336288aSVlad Yasevich if (ret) 1616c6b641a4SVlad Yasevich goto out; 16173336288aSVlad Yasevich 1618db8dac20SDavid S. Miller ret = inet6_register_protosw(&udpv6_protosw); 1619db8dac20SDavid S. Miller if (ret) 1620db8dac20SDavid S. Miller goto out_udpv6_protocol; 1621db8dac20SDavid S. Miller out: 1622db8dac20SDavid S. Miller return ret; 1623db8dac20SDavid S. Miller 1624db8dac20SDavid S. Miller out_udpv6_protocol: 1625db8dac20SDavid S. Miller inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP); 1626db8dac20SDavid S. Miller goto out; 1627db8dac20SDavid S. Miller } 1628db8dac20SDavid S. Miller 1629db8dac20SDavid S. Miller void udpv6_exit(void) 1630db8dac20SDavid S. Miller { 1631db8dac20SDavid S. Miller inet6_unregister_protosw(&udpv6_protosw); 1632db8dac20SDavid S. Miller inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP); 1633db8dac20SDavid S. Miller } 1634