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> 50db8dac20SDavid S. Miller 51db8dac20SDavid S. Miller #include <linux/proc_fs.h> 52db8dac20SDavid S. Miller #include <linux/seq_file.h> 5322911fc5SEric Dumazet #include <trace/events/skb.h> 54db8dac20SDavid S. Miller #include "udp_impl.h" 55db8dac20SDavid S. Miller 566eada011SEric Dumazet static u32 udp6_ehashfn(const struct net *net, 57b50026b5SHannes Frederic Sowa const struct in6_addr *laddr, 58b50026b5SHannes Frederic Sowa const u16 lport, 59b50026b5SHannes Frederic Sowa const struct in6_addr *faddr, 60b50026b5SHannes Frederic Sowa const __be16 fport) 61b50026b5SHannes Frederic Sowa { 621bbdceefSHannes Frederic Sowa static u32 udp6_ehash_secret __read_mostly; 631bbdceefSHannes Frederic Sowa static u32 udp_ipv6_hash_secret __read_mostly; 641bbdceefSHannes Frederic Sowa 651bbdceefSHannes Frederic Sowa u32 lhash, fhash; 661bbdceefSHannes Frederic Sowa 671bbdceefSHannes Frederic Sowa net_get_random_once(&udp6_ehash_secret, 681bbdceefSHannes Frederic Sowa sizeof(udp6_ehash_secret)); 691bbdceefSHannes Frederic Sowa net_get_random_once(&udp_ipv6_hash_secret, 701bbdceefSHannes Frederic Sowa sizeof(udp_ipv6_hash_secret)); 711bbdceefSHannes Frederic Sowa 721bbdceefSHannes Frederic Sowa lhash = (__force u32)laddr->s6_addr32[3]; 731bbdceefSHannes Frederic Sowa fhash = __ipv6_addr_jhash(faddr, udp_ipv6_hash_secret); 741bbdceefSHannes Frederic Sowa 75b50026b5SHannes Frederic Sowa return __inet6_ehashfn(lhash, lport, fhash, fport, 761bbdceefSHannes Frederic Sowa udp_ipv6_hash_secret + net_hash_mix(net)); 77b50026b5SHannes Frederic Sowa } 78b50026b5SHannes Frederic Sowa 79b2f5e7cdSVlad Yasevich int ipv6_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2) 80b2f5e7cdSVlad Yasevich { 81b2f5e7cdSVlad Yasevich const struct in6_addr *sk2_rcv_saddr6 = inet6_rcv_saddr(sk2); 82b2f5e7cdSVlad Yasevich int sk2_ipv6only = inet_v6_ipv6only(sk2); 83efe4208fSEric Dumazet int addr_type = ipv6_addr_type(&sk->sk_v6_rcv_saddr); 84b2f5e7cdSVlad Yasevich int addr_type2 = sk2_rcv_saddr6 ? ipv6_addr_type(sk2_rcv_saddr6) : IPV6_ADDR_MAPPED; 85b2f5e7cdSVlad Yasevich 86b2f5e7cdSVlad Yasevich /* if both are mapped, treat as IPv4 */ 87b2f5e7cdSVlad Yasevich if (addr_type == IPV6_ADDR_MAPPED && addr_type2 == IPV6_ADDR_MAPPED) 88499923c7SVlad Yasevich return (!sk2_ipv6only && 8950805466SEric Dumazet (!sk->sk_rcv_saddr || !sk2->sk_rcv_saddr || 9050805466SEric Dumazet sk->sk_rcv_saddr == sk2->sk_rcv_saddr)); 91b2f5e7cdSVlad Yasevich 92b2f5e7cdSVlad Yasevich if (addr_type2 == IPV6_ADDR_ANY && 93b2f5e7cdSVlad Yasevich !(sk2_ipv6only && addr_type == IPV6_ADDR_MAPPED)) 94b2f5e7cdSVlad Yasevich return 1; 95b2f5e7cdSVlad Yasevich 96b2f5e7cdSVlad Yasevich if (addr_type == IPV6_ADDR_ANY && 979fe516baSEric Dumazet !(ipv6_only_sock(sk) && addr_type2 == IPV6_ADDR_MAPPED)) 98b2f5e7cdSVlad Yasevich return 1; 99b2f5e7cdSVlad Yasevich 100b2f5e7cdSVlad Yasevich if (sk2_rcv_saddr6 && 101efe4208fSEric Dumazet ipv6_addr_equal(&sk->sk_v6_rcv_saddr, sk2_rcv_saddr6)) 102b2f5e7cdSVlad Yasevich return 1; 103b2f5e7cdSVlad Yasevich 104b2f5e7cdSVlad Yasevich return 0; 105b2f5e7cdSVlad Yasevich } 106b2f5e7cdSVlad Yasevich 1076eada011SEric Dumazet static u32 udp6_portaddr_hash(const struct net *net, 108d4cada4aSEric Dumazet const struct in6_addr *addr6, 109d4cada4aSEric Dumazet unsigned int port) 110d4cada4aSEric Dumazet { 111d4cada4aSEric Dumazet unsigned int hash, mix = net_hash_mix(net); 112d4cada4aSEric Dumazet 113d4cada4aSEric Dumazet if (ipv6_addr_any(addr6)) 114d4cada4aSEric Dumazet hash = jhash_1word(0, mix); 115856540eeSBrian Haley else if (ipv6_addr_v4mapped(addr6)) 1160eae88f3SEric Dumazet hash = jhash_1word((__force u32)addr6->s6_addr32[3], mix); 117d4cada4aSEric Dumazet else 1180eae88f3SEric Dumazet hash = jhash2((__force u32 *)addr6->s6_addr32, 4, mix); 119d4cada4aSEric Dumazet 120d4cada4aSEric Dumazet return hash ^ port; 121d4cada4aSEric Dumazet } 122d4cada4aSEric Dumazet 123d4cada4aSEric Dumazet 1246ba5a3c5SPavel Emelyanov int udp_v6_get_port(struct sock *sk, unsigned short snum) 125db8dac20SDavid S. Miller { 12630fff923SEric Dumazet unsigned int hash2_nulladdr = 12730fff923SEric Dumazet udp6_portaddr_hash(sock_net(sk), &in6addr_any, snum); 12830fff923SEric Dumazet unsigned int hash2_partial = 129efe4208fSEric Dumazet udp6_portaddr_hash(sock_net(sk), &sk->sk_v6_rcv_saddr, 0); 13030fff923SEric Dumazet 131d4cada4aSEric Dumazet /* precompute partial secondary hash */ 13230fff923SEric Dumazet udp_sk(sk)->udp_portaddr_hash = hash2_partial; 13330fff923SEric Dumazet return udp_lib_get_port(sk, snum, ipv6_rcv_saddr_equal, hash2_nulladdr); 134db8dac20SDavid S. Miller } 135db8dac20SDavid S. Miller 136719f8358SEric Dumazet static void udp_v6_rehash(struct sock *sk) 137719f8358SEric Dumazet { 138719f8358SEric Dumazet u16 new_hash = udp6_portaddr_hash(sock_net(sk), 139efe4208fSEric Dumazet &sk->sk_v6_rcv_saddr, 140719f8358SEric Dumazet inet_sk(sk)->inet_num); 141719f8358SEric Dumazet 142719f8358SEric Dumazet udp_lib_rehash(sk, new_hash); 143719f8358SEric Dumazet } 144719f8358SEric Dumazet 145645ca708SEric Dumazet static inline int compute_score(struct sock *sk, struct net *net, 146645ca708SEric Dumazet unsigned short hnum, 14788440ae7SBalazs Scheidler const struct in6_addr *saddr, __be16 sport, 14888440ae7SBalazs Scheidler const struct in6_addr *daddr, __be16 dport, 149645ca708SEric Dumazet int dif) 150db8dac20SDavid S. Miller { 15160c04aecSJoe Perches int score; 15260c04aecSJoe Perches struct inet_sock *inet; 153db8dac20SDavid S. Miller 15460c04aecSJoe Perches if (!net_eq(sock_net(sk), net) || 15560c04aecSJoe Perches udp_sk(sk)->udp_port_hash != hnum || 15660c04aecSJoe Perches sk->sk_family != PF_INET6) 15760c04aecSJoe Perches return -1; 158645ca708SEric Dumazet 159645ca708SEric Dumazet score = 0; 16060c04aecSJoe Perches inet = inet_sk(sk); 16160c04aecSJoe Perches 162c720c7e8SEric Dumazet if (inet->inet_dport) { 163c720c7e8SEric Dumazet if (inet->inet_dport != sport) 164645ca708SEric Dumazet return -1; 165db8dac20SDavid S. Miller score++; 166db8dac20SDavid S. Miller } 16760c04aecSJoe Perches 168efe4208fSEric Dumazet if (!ipv6_addr_any(&sk->sk_v6_rcv_saddr)) { 169efe4208fSEric Dumazet if (!ipv6_addr_equal(&sk->sk_v6_rcv_saddr, daddr)) 170645ca708SEric Dumazet return -1; 171db8dac20SDavid S. Miller score++; 172db8dac20SDavid S. Miller } 17360c04aecSJoe Perches 174efe4208fSEric Dumazet if (!ipv6_addr_any(&sk->sk_v6_daddr)) { 175efe4208fSEric Dumazet if (!ipv6_addr_equal(&sk->sk_v6_daddr, saddr)) 176645ca708SEric Dumazet return -1; 177db8dac20SDavid S. Miller score++; 178db8dac20SDavid S. Miller } 17960c04aecSJoe Perches 180db8dac20SDavid S. Miller if (sk->sk_bound_dev_if) { 181db8dac20SDavid S. Miller if (sk->sk_bound_dev_if != dif) 182645ca708SEric Dumazet return -1; 183db8dac20SDavid S. Miller score++; 184db8dac20SDavid S. Miller } 18560c04aecSJoe Perches 186645ca708SEric Dumazet return score; 187645ca708SEric Dumazet } 188645ca708SEric Dumazet 189fddc17deSEric Dumazet #define SCORE2_MAX (1 + 1 + 1) 190fddc17deSEric Dumazet static inline int compute_score2(struct sock *sk, struct net *net, 191fddc17deSEric Dumazet const struct in6_addr *saddr, __be16 sport, 19260c04aecSJoe Perches const struct in6_addr *daddr, 19360c04aecSJoe Perches unsigned short hnum, int dif) 194fddc17deSEric Dumazet { 19560c04aecSJoe Perches int score; 19660c04aecSJoe Perches struct inet_sock *inet; 197fddc17deSEric Dumazet 19860c04aecSJoe Perches if (!net_eq(sock_net(sk), net) || 19960c04aecSJoe Perches udp_sk(sk)->udp_port_hash != hnum || 20060c04aecSJoe Perches sk->sk_family != PF_INET6) 20160c04aecSJoe Perches return -1; 202fddc17deSEric Dumazet 203efe4208fSEric Dumazet if (!ipv6_addr_equal(&sk->sk_v6_rcv_saddr, daddr)) 204fddc17deSEric Dumazet return -1; 20560c04aecSJoe Perches 206fddc17deSEric Dumazet score = 0; 20760c04aecSJoe Perches inet = inet_sk(sk); 20860c04aecSJoe Perches 209fddc17deSEric Dumazet if (inet->inet_dport) { 210fddc17deSEric Dumazet if (inet->inet_dport != sport) 211fddc17deSEric Dumazet return -1; 212fddc17deSEric Dumazet score++; 213fddc17deSEric Dumazet } 21460c04aecSJoe Perches 215efe4208fSEric Dumazet if (!ipv6_addr_any(&sk->sk_v6_daddr)) { 216efe4208fSEric Dumazet if (!ipv6_addr_equal(&sk->sk_v6_daddr, saddr)) 217fddc17deSEric Dumazet return -1; 218fddc17deSEric Dumazet score++; 219fddc17deSEric Dumazet } 22060c04aecSJoe Perches 221fddc17deSEric Dumazet if (sk->sk_bound_dev_if) { 222fddc17deSEric Dumazet if (sk->sk_bound_dev_if != dif) 223fddc17deSEric Dumazet return -1; 224fddc17deSEric Dumazet score++; 225fddc17deSEric Dumazet } 22660c04aecSJoe Perches 227fddc17deSEric Dumazet return score; 228fddc17deSEric Dumazet } 229fddc17deSEric Dumazet 230fddc17deSEric Dumazet /* called with read_rcu_lock() */ 231fddc17deSEric Dumazet static struct sock *udp6_lib_lookup2(struct net *net, 232fddc17deSEric Dumazet const struct in6_addr *saddr, __be16 sport, 233fddc17deSEric Dumazet const struct in6_addr *daddr, unsigned int hnum, int dif, 234fddc17deSEric Dumazet struct udp_hslot *hslot2, unsigned int slot2) 235fddc17deSEric Dumazet { 236fddc17deSEric Dumazet struct sock *sk, *result; 237fddc17deSEric Dumazet struct hlist_nulls_node *node; 23872289b96STom Herbert int score, badness, matches = 0, reuseport = 0; 23972289b96STom Herbert u32 hash = 0; 240fddc17deSEric Dumazet 241fddc17deSEric Dumazet begin: 242fddc17deSEric Dumazet result = NULL; 243fddc17deSEric Dumazet badness = -1; 244fddc17deSEric Dumazet udp_portaddr_for_each_entry_rcu(sk, node, &hslot2->head) { 245fddc17deSEric Dumazet score = compute_score2(sk, net, saddr, sport, 246fddc17deSEric Dumazet daddr, hnum, dif); 247fddc17deSEric Dumazet if (score > badness) { 248fddc17deSEric Dumazet result = sk; 249fddc17deSEric Dumazet badness = score; 25072289b96STom Herbert reuseport = sk->sk_reuseport; 25172289b96STom Herbert if (reuseport) { 252b50026b5SHannes Frederic Sowa hash = udp6_ehashfn(net, daddr, hnum, 25372289b96STom Herbert saddr, sport); 25472289b96STom Herbert matches = 1; 25572289b96STom Herbert } else if (score == SCORE2_MAX) 256fddc17deSEric Dumazet goto exact_match; 25772289b96STom Herbert } else if (score == badness && reuseport) { 25872289b96STom Herbert matches++; 2598fc54f68SDaniel Borkmann if (reciprocal_scale(hash, matches) == 0) 26072289b96STom Herbert result = sk; 26172289b96STom Herbert hash = next_pseudo_random32(hash); 262fddc17deSEric Dumazet } 263fddc17deSEric Dumazet } 264fddc17deSEric Dumazet /* 265fddc17deSEric Dumazet * if the nulls value we got at the end of this lookup is 266fddc17deSEric Dumazet * not the expected one, we must restart lookup. 267fddc17deSEric Dumazet * We probably met an item that was moved to another chain. 268fddc17deSEric Dumazet */ 269fddc17deSEric Dumazet if (get_nulls_value(node) != slot2) 270fddc17deSEric Dumazet goto begin; 271fddc17deSEric Dumazet 272fddc17deSEric Dumazet if (result) { 273fddc17deSEric Dumazet exact_match: 274c31504dcSEric Dumazet if (unlikely(!atomic_inc_not_zero_hint(&result->sk_refcnt, 2))) 275fddc17deSEric Dumazet result = NULL; 276fddc17deSEric Dumazet else if (unlikely(compute_score2(result, net, saddr, sport, 277fddc17deSEric Dumazet daddr, hnum, dif) < badness)) { 278fddc17deSEric Dumazet sock_put(result); 279fddc17deSEric Dumazet goto begin; 280fddc17deSEric Dumazet } 281fddc17deSEric Dumazet } 282fddc17deSEric Dumazet return result; 283fddc17deSEric Dumazet } 284fddc17deSEric Dumazet 285fce82338SPavel Emelyanov struct sock *__udp6_lib_lookup(struct net *net, 28688440ae7SBalazs Scheidler const struct in6_addr *saddr, __be16 sport, 28788440ae7SBalazs Scheidler const struct in6_addr *daddr, __be16 dport, 288645ca708SEric Dumazet int dif, struct udp_table *udptable) 289645ca708SEric Dumazet { 290271b72c7SEric Dumazet struct sock *sk, *result; 29188ab1932SEric Dumazet struct hlist_nulls_node *node; 292645ca708SEric Dumazet unsigned short hnum = ntohs(dport); 293fddc17deSEric Dumazet unsigned int hash2, slot2, slot = udp_hashfn(net, hnum, udptable->mask); 294fddc17deSEric Dumazet struct udp_hslot *hslot2, *hslot = &udptable->hash[slot]; 29572289b96STom Herbert int score, badness, matches = 0, reuseport = 0; 29672289b96STom Herbert u32 hash = 0; 297645ca708SEric Dumazet 298271b72c7SEric Dumazet rcu_read_lock(); 299fddc17deSEric Dumazet if (hslot->count > 10) { 300fddc17deSEric Dumazet hash2 = udp6_portaddr_hash(net, daddr, hnum); 301fddc17deSEric Dumazet slot2 = hash2 & udptable->mask; 302fddc17deSEric Dumazet hslot2 = &udptable->hash2[slot2]; 303fddc17deSEric Dumazet if (hslot->count < hslot2->count) 304fddc17deSEric Dumazet goto begin; 305fddc17deSEric Dumazet 306fddc17deSEric Dumazet result = udp6_lib_lookup2(net, saddr, sport, 307fddc17deSEric Dumazet daddr, hnum, dif, 308fddc17deSEric Dumazet hslot2, slot2); 309fddc17deSEric Dumazet if (!result) { 310fddc17deSEric Dumazet hash2 = udp6_portaddr_hash(net, &in6addr_any, hnum); 311fddc17deSEric Dumazet slot2 = hash2 & udptable->mask; 312fddc17deSEric Dumazet hslot2 = &udptable->hash2[slot2]; 313fddc17deSEric Dumazet if (hslot->count < hslot2->count) 314fddc17deSEric Dumazet goto begin; 315fddc17deSEric Dumazet 3161223c67cSJorge Boncompte [DTI2] result = udp6_lib_lookup2(net, saddr, sport, 3171223c67cSJorge Boncompte [DTI2] &in6addr_any, hnum, dif, 318fddc17deSEric Dumazet hslot2, slot2); 319fddc17deSEric Dumazet } 320fddc17deSEric Dumazet rcu_read_unlock(); 321fddc17deSEric Dumazet return result; 322fddc17deSEric Dumazet } 323271b72c7SEric Dumazet begin: 324271b72c7SEric Dumazet result = NULL; 325271b72c7SEric Dumazet badness = -1; 32688ab1932SEric Dumazet sk_nulls_for_each_rcu(sk, node, &hslot->head) { 327645ca708SEric Dumazet score = compute_score(sk, net, hnum, saddr, sport, daddr, dport, dif); 328645ca708SEric Dumazet if (score > badness) { 329db8dac20SDavid S. Miller result = sk; 330db8dac20SDavid S. Miller badness = score; 33172289b96STom Herbert reuseport = sk->sk_reuseport; 33272289b96STom Herbert if (reuseport) { 333b50026b5SHannes Frederic Sowa hash = udp6_ehashfn(net, daddr, hnum, 33472289b96STom Herbert saddr, sport); 33572289b96STom Herbert matches = 1; 33672289b96STom Herbert } 33772289b96STom Herbert } else if (score == badness && reuseport) { 33872289b96STom Herbert matches++; 3398fc54f68SDaniel Borkmann if (reciprocal_scale(hash, matches) == 0) 34072289b96STom Herbert result = sk; 34172289b96STom Herbert hash = next_pseudo_random32(hash); 342db8dac20SDavid S. Miller } 343db8dac20SDavid S. Miller } 34488ab1932SEric Dumazet /* 34588ab1932SEric Dumazet * if the nulls value we got at the end of this lookup is 34688ab1932SEric Dumazet * not the expected one, we must restart lookup. 34788ab1932SEric Dumazet * We probably met an item that was moved to another chain. 34888ab1932SEric Dumazet */ 349fddc17deSEric Dumazet if (get_nulls_value(node) != slot) 35088ab1932SEric Dumazet goto begin; 35188ab1932SEric Dumazet 352271b72c7SEric Dumazet if (result) { 353c31504dcSEric Dumazet if (unlikely(!atomic_inc_not_zero_hint(&result->sk_refcnt, 2))) 354271b72c7SEric Dumazet result = NULL; 355271b72c7SEric Dumazet else if (unlikely(compute_score(result, net, hnum, saddr, sport, 356271b72c7SEric Dumazet daddr, dport, dif) < badness)) { 357271b72c7SEric Dumazet sock_put(result); 358271b72c7SEric Dumazet goto begin; 359271b72c7SEric Dumazet } 360271b72c7SEric Dumazet } 361271b72c7SEric Dumazet rcu_read_unlock(); 362db8dac20SDavid S. Miller return result; 363db8dac20SDavid S. Miller } 364fce82338SPavel Emelyanov EXPORT_SYMBOL_GPL(__udp6_lib_lookup); 365db8dac20SDavid S. Miller 366607c4aafSKOVACS Krisztian static struct sock *__udp6_lib_lookup_skb(struct sk_buff *skb, 367607c4aafSKOVACS Krisztian __be16 sport, __be16 dport, 368645ca708SEric Dumazet struct udp_table *udptable) 369607c4aafSKOVACS Krisztian { 37023542618SKOVACS Krisztian struct sock *sk; 371b71d1d42SEric Dumazet const struct ipv6hdr *iph = ipv6_hdr(skb); 372607c4aafSKOVACS Krisztian 373e5d08d71SIan Morris sk = skb_steal_sock(skb); 374e5d08d71SIan Morris if (unlikely(sk)) 37523542618SKOVACS Krisztian return sk; 376adf30907SEric Dumazet return __udp6_lib_lookup(dev_net(skb_dst(skb)->dev), &iph->saddr, sport, 377607c4aafSKOVACS Krisztian &iph->daddr, dport, inet6_iif(skb), 378607c4aafSKOVACS Krisztian udptable); 379607c4aafSKOVACS Krisztian } 380607c4aafSKOVACS Krisztian 381aa976fc0SBalazs Scheidler struct sock *udp6_lib_lookup(struct net *net, const struct in6_addr *saddr, __be16 sport, 382aa976fc0SBalazs Scheidler const struct in6_addr *daddr, __be16 dport, int dif) 383aa976fc0SBalazs Scheidler { 384aa976fc0SBalazs Scheidler return __udp6_lib_lookup(net, saddr, sport, daddr, dport, dif, &udp_table); 385aa976fc0SBalazs Scheidler } 386aa976fc0SBalazs Scheidler EXPORT_SYMBOL_GPL(udp6_lib_lookup); 387aa976fc0SBalazs Scheidler 388aa976fc0SBalazs Scheidler 389db8dac20SDavid S. Miller /* 390db8dac20SDavid S. Miller * This should be easy, if there is something there we 391db8dac20SDavid S. Miller * return it, otherwise we block. 392db8dac20SDavid S. Miller */ 393db8dac20SDavid S. Miller 3941b784140SYing Xue int udpv6_recvmsg(struct sock *sk, struct msghdr *msg, size_t len, 395db8dac20SDavid S. Miller int noblock, int flags, int *addr_len) 396db8dac20SDavid S. Miller { 397db8dac20SDavid S. Miller struct ipv6_pinfo *np = inet6_sk(sk); 398db8dac20SDavid S. Miller struct inet_sock *inet = inet_sk(sk); 399db8dac20SDavid S. Miller struct sk_buff *skb; 40059c2cdaeSDavid S. Miller unsigned int ulen, copied; 4013f518bf7SPavel Emelyanov int peeked, off = 0; 402db8dac20SDavid S. Miller int err; 403db8dac20SDavid S. Miller int is_udplite = IS_UDPLITE(sk); 404f26ba175SWei Yongjun int is_udp4; 4058a74ad60SEric Dumazet bool slow; 406db8dac20SDavid S. Miller 407db8dac20SDavid S. Miller if (flags & MSG_ERRQUEUE) 40885fbaa75SHannes Frederic Sowa return ipv6_recv_error(sk, msg, len, addr_len); 409db8dac20SDavid S. Miller 4104b340ae2SBrian Haley if (np->rxpmtu && np->rxopt.bits.rxpmtu) 41185fbaa75SHannes Frederic Sowa return ipv6_recv_rxpmtu(sk, msg, len, addr_len); 4124b340ae2SBrian Haley 413db8dac20SDavid S. Miller try_again: 414db8dac20SDavid S. Miller skb = __skb_recv_datagram(sk, flags | (noblock ? MSG_DONTWAIT : 0), 4153f518bf7SPavel Emelyanov &peeked, &off, &err); 416db8dac20SDavid S. Miller if (!skb) 417db8dac20SDavid S. Miller goto out; 418db8dac20SDavid S. Miller 419db8dac20SDavid S. Miller ulen = skb->len - sizeof(struct udphdr); 42059c2cdaeSDavid S. Miller copied = len; 42159c2cdaeSDavid S. Miller if (copied > ulen) 42259c2cdaeSDavid S. Miller copied = ulen; 42359c2cdaeSDavid S. Miller else if (copied < ulen) 424db8dac20SDavid S. Miller msg->msg_flags |= MSG_TRUNC; 425db8dac20SDavid S. Miller 426f26ba175SWei Yongjun is_udp4 = (skb->protocol == htons(ETH_P_IP)); 427f26ba175SWei Yongjun 428db8dac20SDavid S. Miller /* 429db8dac20SDavid S. Miller * If checksum is needed at all, try to do it while copying the 430db8dac20SDavid S. Miller * data. If the data is truncated, or if we only want a partial 431db8dac20SDavid S. Miller * coverage checksum (UDP-Lite), do it before the copy. 432db8dac20SDavid S. Miller */ 433db8dac20SDavid S. Miller 43459c2cdaeSDavid S. Miller if (copied < ulen || UDP_SKB_CB(skb)->partial_cov) { 435db8dac20SDavid S. Miller if (udp_lib_checksum_complete(skb)) 436db8dac20SDavid S. Miller goto csum_copy_err; 437db8dac20SDavid S. Miller } 438db8dac20SDavid S. Miller 439db8dac20SDavid S. Miller if (skb_csum_unnecessary(skb)) 44051f3d02bSDavid S. Miller err = skb_copy_datagram_msg(skb, sizeof(struct udphdr), 44151f3d02bSDavid S. Miller msg, copied); 442db8dac20SDavid S. Miller else { 443227158dbSAl Viro err = skb_copy_and_csum_datagram_msg(skb, sizeof(struct udphdr), msg); 444db8dac20SDavid S. Miller if (err == -EINVAL) 445db8dac20SDavid S. Miller goto csum_copy_err; 446db8dac20SDavid S. Miller } 44722911fc5SEric Dumazet if (unlikely(err)) { 44822911fc5SEric Dumazet trace_kfree_skb(skb, udpv6_recvmsg); 449979402b1SEric Dumazet if (!peeked) { 450979402b1SEric Dumazet atomic_inc(&sk->sk_drops); 451979402b1SEric Dumazet if (is_udp4) 452979402b1SEric Dumazet UDP_INC_STATS_USER(sock_net(sk), 453979402b1SEric Dumazet UDP_MIB_INERRORS, 454979402b1SEric Dumazet is_udplite); 455979402b1SEric Dumazet else 456979402b1SEric Dumazet UDP6_INC_STATS_USER(sock_net(sk), 457979402b1SEric Dumazet UDP_MIB_INERRORS, 458979402b1SEric Dumazet is_udplite); 459979402b1SEric Dumazet } 460db8dac20SDavid S. Miller goto out_free; 46122911fc5SEric Dumazet } 462f26ba175SWei Yongjun if (!peeked) { 463f26ba175SWei Yongjun if (is_udp4) 464f26ba175SWei Yongjun UDP_INC_STATS_USER(sock_net(sk), 465f26ba175SWei Yongjun UDP_MIB_INDATAGRAMS, is_udplite); 466f26ba175SWei Yongjun else 467235b9f7aSPavel Emelyanov UDP6_INC_STATS_USER(sock_net(sk), 468235b9f7aSPavel Emelyanov UDP_MIB_INDATAGRAMS, is_udplite); 469f26ba175SWei Yongjun } 470db8dac20SDavid S. Miller 4713b885787SNeil Horman sock_recv_ts_and_drops(msg, sk, skb); 472db8dac20SDavid S. Miller 473db8dac20SDavid S. Miller /* Copy the address. */ 474db8dac20SDavid S. Miller if (msg->msg_name) { 475342dfc30SSteffen Hurrle DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, msg->msg_name); 476db8dac20SDavid S. Miller sin6->sin6_family = AF_INET6; 477db8dac20SDavid S. Miller sin6->sin6_port = udp_hdr(skb)->source; 478db8dac20SDavid S. Miller sin6->sin6_flowinfo = 0; 479db8dac20SDavid S. Miller 480842df073SHannes Frederic Sowa if (is_udp4) { 481b301e82cSBrian Haley ipv6_addr_set_v4mapped(ip_hdr(skb)->saddr, 482b301e82cSBrian Haley &sin6->sin6_addr); 483842df073SHannes Frederic Sowa sin6->sin6_scope_id = 0; 484842df073SHannes Frederic Sowa } else { 4854e3fd7a0SAlexey Dobriyan sin6->sin6_addr = ipv6_hdr(skb)->saddr; 486842df073SHannes Frederic Sowa sin6->sin6_scope_id = 487842df073SHannes Frederic Sowa ipv6_iface_scope_id(&sin6->sin6_addr, 4884330487aSDuan Jiong inet6_iif(skb)); 489db8dac20SDavid S. Miller } 490bceaa902SHannes Frederic Sowa *addr_len = sizeof(*sin6); 491db8dac20SDavid S. Miller } 4924b261c75SHannes Frederic Sowa 4934b261c75SHannes Frederic Sowa if (np->rxopt.all) 4944b261c75SHannes Frederic Sowa ip6_datagram_recv_common_ctl(sk, msg, skb); 4954b261c75SHannes Frederic Sowa 496f26ba175SWei Yongjun if (is_udp4) { 497db8dac20SDavid S. Miller if (inet->cmsg_flags) 498db8dac20SDavid S. Miller ip_cmsg_recv(msg, skb); 499db8dac20SDavid S. Miller } else { 500db8dac20SDavid S. Miller if (np->rxopt.all) 5014b261c75SHannes Frederic Sowa ip6_datagram_recv_specific_ctl(sk, msg, skb); 502db8dac20SDavid S. Miller } 503db8dac20SDavid S. Miller 50459c2cdaeSDavid S. Miller err = copied; 505db8dac20SDavid S. Miller if (flags & MSG_TRUNC) 506db8dac20SDavid S. Miller err = ulen; 507db8dac20SDavid S. Miller 508db8dac20SDavid S. Miller out_free: 5099d410c79SEric Dumazet skb_free_datagram_locked(sk, skb); 510db8dac20SDavid S. Miller out: 511db8dac20SDavid S. Miller return err; 512db8dac20SDavid S. Miller 513db8dac20SDavid S. Miller csum_copy_err: 5148a74ad60SEric Dumazet slow = lock_sock_fast(sk); 5150856f939SWei Yongjun if (!skb_kill_datagram(sk, skb, flags)) { 5166a5dc9e5SEric Dumazet if (is_udp4) { 5176a5dc9e5SEric Dumazet UDP_INC_STATS_USER(sock_net(sk), 5186a5dc9e5SEric Dumazet UDP_MIB_CSUMERRORS, is_udplite); 5190856f939SWei Yongjun UDP_INC_STATS_USER(sock_net(sk), 5200856f939SWei Yongjun UDP_MIB_INERRORS, is_udplite); 5216a5dc9e5SEric Dumazet } else { 5226a5dc9e5SEric Dumazet UDP6_INC_STATS_USER(sock_net(sk), 5236a5dc9e5SEric Dumazet UDP_MIB_CSUMERRORS, is_udplite); 5240856f939SWei Yongjun UDP6_INC_STATS_USER(sock_net(sk), 5250856f939SWei Yongjun UDP_MIB_INERRORS, is_udplite); 5260856f939SWei Yongjun } 5276a5dc9e5SEric Dumazet } 5288a74ad60SEric Dumazet unlock_sock_fast(sk, slow); 529db8dac20SDavid S. Miller 53032c90254SXufeng Zhang if (noblock) 531db8dac20SDavid S. Miller return -EAGAIN; 5329cfaa8deSXufeng Zhang 5339cfaa8deSXufeng Zhang /* starting over for a new packet */ 5349cfaa8deSXufeng Zhang msg->msg_flags &= ~MSG_TRUNC; 535db8dac20SDavid S. Miller goto try_again; 536db8dac20SDavid S. Miller } 537db8dac20SDavid S. Miller 538db8dac20SDavid S. Miller void __udp6_lib_err(struct sk_buff *skb, struct inet6_skb_parm *opt, 539d5fdd6baSBrian Haley u8 type, u8 code, int offset, __be32 info, 540645ca708SEric Dumazet struct udp_table *udptable) 541db8dac20SDavid S. Miller { 542db8dac20SDavid S. Miller struct ipv6_pinfo *np; 543b71d1d42SEric Dumazet const struct ipv6hdr *hdr = (const struct ipv6hdr *)skb->data; 544b71d1d42SEric Dumazet const struct in6_addr *saddr = &hdr->saddr; 545b71d1d42SEric Dumazet const struct in6_addr *daddr = &hdr->daddr; 546db8dac20SDavid S. Miller struct udphdr *uh = (struct udphdr *)(skb->data+offset); 547db8dac20SDavid S. Miller struct sock *sk; 548db8dac20SDavid S. Miller int err; 5497304fe46SDuan Jiong struct net *net = dev_net(skb->dev); 550db8dac20SDavid S. Miller 5517304fe46SDuan Jiong sk = __udp6_lib_lookup(net, daddr, uh->dest, 552db8dac20SDavid S. Miller saddr, uh->source, inet6_iif(skb), udptable); 55363159f29SIan Morris if (!sk) { 5547304fe46SDuan Jiong ICMP6_INC_STATS_BH(net, __in6_dev_get(skb->dev), 5557304fe46SDuan Jiong ICMP6_MIB_INERRORS); 556db8dac20SDavid S. Miller return; 5577304fe46SDuan Jiong } 558db8dac20SDavid S. Miller 55993b36cf3SHannes Frederic Sowa if (type == ICMPV6_PKT_TOOBIG) { 56093b36cf3SHannes Frederic Sowa if (!ip6_sk_accept_pmtu(sk)) 56193b36cf3SHannes Frederic Sowa goto out; 56281aded24SDavid S. Miller ip6_sk_update_pmtu(skb, sk, info); 56393b36cf3SHannes Frederic Sowa } 5641a462d18SDuan Jiong if (type == NDISC_REDIRECT) { 565ec18d9a2SDavid S. Miller ip6_sk_redirect(skb, sk); 5661a462d18SDuan Jiong goto out; 5671a462d18SDuan Jiong } 56881aded24SDavid S. Miller 569db8dac20SDavid S. Miller np = inet6_sk(sk); 570db8dac20SDavid S. Miller 571db8dac20SDavid S. Miller if (!icmpv6_err_convert(type, code, &err) && !np->recverr) 572db8dac20SDavid S. Miller goto out; 573db8dac20SDavid S. Miller 574db8dac20SDavid S. Miller if (sk->sk_state != TCP_ESTABLISHED && !np->recverr) 575db8dac20SDavid S. Miller goto out; 576db8dac20SDavid S. Miller 577b1faf566SEric Dumazet if (np->recverr) 578db8dac20SDavid S. Miller ipv6_icmp_error(sk, skb, err, uh->dest, ntohl(info), (u8 *)(uh+1)); 579b1faf566SEric Dumazet 580db8dac20SDavid S. Miller sk->sk_err = err; 581db8dac20SDavid S. Miller sk->sk_error_report(sk); 582db8dac20SDavid S. Miller out: 583db8dac20SDavid S. Miller sock_put(sk); 584db8dac20SDavid S. Miller } 585db8dac20SDavid S. Miller 586f7ad74feSBenjamin LaHaise static int __udpv6_queue_rcv_skb(struct sock *sk, struct sk_buff *skb) 587f7ad74feSBenjamin LaHaise { 588f7ad74feSBenjamin LaHaise int rc; 589f7ad74feSBenjamin LaHaise 590efe4208fSEric Dumazet if (!ipv6_addr_any(&sk->sk_v6_daddr)) { 591f7ad74feSBenjamin LaHaise sock_rps_save_rxhash(sk, skb); 592005ec974SShawn Bohrer sk_mark_napi_id(sk, skb); 5932c8c56e1SEric Dumazet sk_incoming_cpu_update(sk); 594005ec974SShawn Bohrer } 595f7ad74feSBenjamin LaHaise 596f7ad74feSBenjamin LaHaise rc = sock_queue_rcv_skb(sk, skb); 597f7ad74feSBenjamin LaHaise if (rc < 0) { 598f7ad74feSBenjamin LaHaise int is_udplite = IS_UDPLITE(sk); 599f7ad74feSBenjamin LaHaise 600f7ad74feSBenjamin LaHaise /* Note that an ENOMEM error is charged twice */ 601f7ad74feSBenjamin LaHaise if (rc == -ENOMEM) 602f7ad74feSBenjamin LaHaise UDP6_INC_STATS_BH(sock_net(sk), 603f7ad74feSBenjamin LaHaise UDP_MIB_RCVBUFERRORS, is_udplite); 604f7ad74feSBenjamin LaHaise UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_INERRORS, is_udplite); 605f7ad74feSBenjamin LaHaise kfree_skb(skb); 606f7ad74feSBenjamin LaHaise return -1; 607f7ad74feSBenjamin LaHaise } 608f7ad74feSBenjamin LaHaise return 0; 609f7ad74feSBenjamin LaHaise } 610f7ad74feSBenjamin LaHaise 611db8dac20SDavid S. Miller static __inline__ void udpv6_err(struct sk_buff *skb, 612d5fdd6baSBrian Haley struct inet6_skb_parm *opt, u8 type, 613d5fdd6baSBrian Haley u8 code, int offset, __be32 info) 614db8dac20SDavid S. Miller { 615645ca708SEric Dumazet __udp6_lib_err(skb, opt, type, code, offset, info, &udp_table); 616db8dac20SDavid S. Miller } 617db8dac20SDavid S. Miller 618d7f3f621SBenjamin LaHaise static struct static_key udpv6_encap_needed __read_mostly; 619d7f3f621SBenjamin LaHaise void udpv6_encap_enable(void) 620d7f3f621SBenjamin LaHaise { 621d7f3f621SBenjamin LaHaise if (!static_key_enabled(&udpv6_encap_needed)) 622d7f3f621SBenjamin LaHaise static_key_slow_inc(&udpv6_encap_needed); 623d7f3f621SBenjamin LaHaise } 624d7f3f621SBenjamin LaHaise EXPORT_SYMBOL(udpv6_encap_enable); 625d7f3f621SBenjamin LaHaise 626db8dac20SDavid S. Miller int udpv6_queue_rcv_skb(struct sock *sk, struct sk_buff *skb) 627db8dac20SDavid S. Miller { 628db8dac20SDavid S. Miller struct udp_sock *up = udp_sk(sk); 629db8dac20SDavid S. Miller int rc; 630db8dac20SDavid S. Miller int is_udplite = IS_UDPLITE(sk); 631db8dac20SDavid S. Miller 632db8dac20SDavid S. Miller if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb)) 633db8dac20SDavid S. Miller goto drop; 634db8dac20SDavid S. Miller 635d7f3f621SBenjamin LaHaise if (static_key_false(&udpv6_encap_needed) && up->encap_type) { 636d7f3f621SBenjamin LaHaise int (*encap_rcv)(struct sock *sk, struct sk_buff *skb); 637d7f3f621SBenjamin LaHaise 638d7f3f621SBenjamin LaHaise /* 639d7f3f621SBenjamin LaHaise * This is an encapsulation socket so pass the skb to 640d7f3f621SBenjamin LaHaise * the socket's udp_encap_rcv() hook. Otherwise, just 641d7f3f621SBenjamin LaHaise * fall through and pass this up the UDP socket. 642d7f3f621SBenjamin LaHaise * up->encap_rcv() returns the following value: 643d7f3f621SBenjamin LaHaise * =0 if skb was successfully passed to the encap 644d7f3f621SBenjamin LaHaise * handler or was discarded by it. 645d7f3f621SBenjamin LaHaise * >0 if skb should be passed on to UDP. 646d7f3f621SBenjamin LaHaise * <0 if skb should be resubmitted as proto -N 647d7f3f621SBenjamin LaHaise */ 648d7f3f621SBenjamin LaHaise 649d7f3f621SBenjamin LaHaise /* if we're overly short, let UDP handle it */ 650d7f3f621SBenjamin LaHaise encap_rcv = ACCESS_ONCE(up->encap_rcv); 651d7f3f621SBenjamin LaHaise if (skb->len > sizeof(struct udphdr) && encap_rcv != NULL) { 652d7f3f621SBenjamin LaHaise int ret; 653d7f3f621SBenjamin LaHaise 6540a80966bSTom Herbert /* Verify checksum before giving to encap */ 6550a80966bSTom Herbert if (udp_lib_checksum_complete(skb)) 6560a80966bSTom Herbert goto csum_error; 6570a80966bSTom Herbert 658d7f3f621SBenjamin LaHaise ret = encap_rcv(sk, skb); 659d7f3f621SBenjamin LaHaise if (ret <= 0) { 660d7f3f621SBenjamin LaHaise UDP_INC_STATS_BH(sock_net(sk), 661d7f3f621SBenjamin LaHaise UDP_MIB_INDATAGRAMS, 662d7f3f621SBenjamin LaHaise is_udplite); 663d7f3f621SBenjamin LaHaise return -ret; 664d7f3f621SBenjamin LaHaise } 665d7f3f621SBenjamin LaHaise } 666d7f3f621SBenjamin LaHaise 667d7f3f621SBenjamin LaHaise /* FALLTHROUGH -- it's a UDP Packet */ 668d7f3f621SBenjamin LaHaise } 669d7f3f621SBenjamin LaHaise 670db8dac20SDavid S. Miller /* 671db8dac20SDavid S. Miller * UDP-Lite specific tests, ignored on UDP sockets (see net/ipv4/udp.c). 672db8dac20SDavid S. Miller */ 673db8dac20SDavid S. Miller if ((is_udplite & UDPLITE_RECV_CC) && UDP_SKB_CB(skb)->partial_cov) { 674db8dac20SDavid S. Miller 675db8dac20SDavid S. Miller if (up->pcrlen == 0) { /* full coverage was set */ 676ba7a46f1SJoe Perches net_dbg_ratelimited("UDPLITE6: partial coverage %d while full coverage %d requested\n", 677db8dac20SDavid S. Miller UDP_SKB_CB(skb)->cscov, skb->len); 678db8dac20SDavid S. Miller goto drop; 679db8dac20SDavid S. Miller } 680db8dac20SDavid S. Miller if (UDP_SKB_CB(skb)->cscov < up->pcrlen) { 681ba7a46f1SJoe Perches net_dbg_ratelimited("UDPLITE6: coverage %d too small, need min %d\n", 682db8dac20SDavid S. Miller UDP_SKB_CB(skb)->cscov, up->pcrlen); 683db8dac20SDavid S. Miller goto drop; 684db8dac20SDavid S. Miller } 685db8dac20SDavid S. Miller } 686db8dac20SDavid S. Miller 68733d480ceSEric Dumazet if (rcu_access_pointer(sk->sk_filter)) { 688db8dac20SDavid S. Miller if (udp_lib_checksum_complete(skb)) 6896a5dc9e5SEric Dumazet goto csum_error; 690db8dac20SDavid S. Miller } 691db8dac20SDavid S. Miller 692274f482dSSorin Dumitru if (sk_rcvqueues_full(sk, sk->sk_rcvbuf)) { 6933e215c8dSJames M Leddy UDP6_INC_STATS_BH(sock_net(sk), 6943e215c8dSJames M Leddy UDP_MIB_RCVBUFERRORS, is_udplite); 695cb80ef46SBenjamin LaHaise goto drop; 6963e215c8dSJames M Leddy } 697cb80ef46SBenjamin LaHaise 698d826eb14SEric Dumazet skb_dst_drop(skb); 699db8dac20SDavid S. Miller 700cb80ef46SBenjamin LaHaise bh_lock_sock(sk); 701cb80ef46SBenjamin LaHaise rc = 0; 702cb80ef46SBenjamin LaHaise if (!sock_owned_by_user(sk)) 703f7ad74feSBenjamin LaHaise rc = __udpv6_queue_rcv_skb(sk, skb); 704cb80ef46SBenjamin LaHaise else if (sk_add_backlog(sk, skb, sk->sk_rcvbuf)) { 705cb80ef46SBenjamin LaHaise bh_unlock_sock(sk); 706cb80ef46SBenjamin LaHaise goto drop; 707cb80ef46SBenjamin LaHaise } 708cb80ef46SBenjamin LaHaise bh_unlock_sock(sk); 709f7ad74feSBenjamin LaHaise 710f7ad74feSBenjamin LaHaise return rc; 7113e215c8dSJames M Leddy 7126a5dc9e5SEric Dumazet csum_error: 7136a5dc9e5SEric Dumazet UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_CSUMERRORS, is_udplite); 714db8dac20SDavid S. Miller drop: 715ef28d1a2SPavel Emelyanov UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_INERRORS, is_udplite); 716cb80ef46SBenjamin LaHaise atomic_inc(&sk->sk_drops); 717db8dac20SDavid S. Miller kfree_skb(skb); 718db8dac20SDavid S. Miller return -1; 719db8dac20SDavid S. Miller } 720db8dac20SDavid S. Miller 7215cf3d461SDavid Held static bool __udp_v6_is_mcast_sock(struct net *net, struct sock *sk, 722b71d1d42SEric Dumazet __be16 loc_port, const struct in6_addr *loc_addr, 723b71d1d42SEric Dumazet __be16 rmt_port, const struct in6_addr *rmt_addr, 7245cf3d461SDavid Held int dif, unsigned short hnum) 725db8dac20SDavid S. Miller { 7269e89fd8bSSven Wegener struct inet_sock *inet = inet_sk(sk); 727db8dac20SDavid S. Miller 7289e89fd8bSSven Wegener if (!net_eq(sock_net(sk), net)) 7295cf3d461SDavid Held return false; 730b8ad0cbcSDaniel Lezcano 7315cf3d461SDavid Held if (udp_sk(sk)->udp_port_hash != hnum || 7325cf3d461SDavid Held sk->sk_family != PF_INET6 || 7335cf3d461SDavid Held (inet->inet_dport && inet->inet_dport != rmt_port) || 7345cf3d461SDavid Held (!ipv6_addr_any(&sk->sk_v6_daddr) && 7355cf3d461SDavid Held !ipv6_addr_equal(&sk->sk_v6_daddr, rmt_addr)) || 7365cf3d461SDavid Held (sk->sk_bound_dev_if && sk->sk_bound_dev_if != dif)) 7375cf3d461SDavid Held return false; 7389e89fd8bSSven Wegener if (!inet6_mc_check(sk, loc_addr, rmt_addr)) 7395cf3d461SDavid Held return false; 7405cf3d461SDavid Held return true; 741db8dac20SDavid S. Miller } 742db8dac20SDavid S. Miller 743a1ab77f9SEric Dumazet static void flush_stack(struct sock **stack, unsigned int count, 744a1ab77f9SEric Dumazet struct sk_buff *skb, unsigned int final) 745a1ab77f9SEric Dumazet { 746cb80ef46SBenjamin LaHaise struct sk_buff *skb1 = NULL; 747a1ab77f9SEric Dumazet struct sock *sk; 748cb80ef46SBenjamin LaHaise unsigned int i; 749a1ab77f9SEric Dumazet 750a1ab77f9SEric Dumazet for (i = 0; i < count; i++) { 751a1ab77f9SEric Dumazet sk = stack[i]; 75263159f29SIan Morris if (likely(!skb1)) 753cb80ef46SBenjamin LaHaise skb1 = (i == final) ? skb : skb_clone(skb, GFP_ATOMIC); 754cb80ef46SBenjamin LaHaise if (!skb1) { 755f6b8f32cSEric Dumazet atomic_inc(&sk->sk_drops); 756cb80ef46SBenjamin LaHaise UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_RCVBUFERRORS, 757cb80ef46SBenjamin LaHaise IS_UDPLITE(sk)); 758cb80ef46SBenjamin LaHaise UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_INERRORS, 759cb80ef46SBenjamin LaHaise IS_UDPLITE(sk)); 760a1ab77f9SEric Dumazet } 761cb80ef46SBenjamin LaHaise 762cb80ef46SBenjamin LaHaise if (skb1 && udpv6_queue_rcv_skb(sk, skb1) <= 0) 763cb80ef46SBenjamin LaHaise skb1 = NULL; 7642dc41cffSDavid Held sock_put(sk); 765cb80ef46SBenjamin LaHaise } 766cb80ef46SBenjamin LaHaise if (unlikely(skb1)) 767cb80ef46SBenjamin LaHaise kfree_skb(skb1); 768a1ab77f9SEric Dumazet } 7694068579eSTom Herbert 7704068579eSTom Herbert static void udp6_csum_zero_error(struct sk_buff *skb) 7714068579eSTom Herbert { 7724068579eSTom Herbert /* RFC 2460 section 8.1 says that we SHOULD log 7734068579eSTom Herbert * this error. Well, it is reasonable. 7744068579eSTom Herbert */ 775ba7a46f1SJoe Perches net_dbg_ratelimited("IPv6: udp checksum is 0 for [%pI6c]:%u->[%pI6c]:%u\n", 7764068579eSTom Herbert &ipv6_hdr(skb)->saddr, ntohs(udp_hdr(skb)->source), 7774068579eSTom Herbert &ipv6_hdr(skb)->daddr, ntohs(udp_hdr(skb)->dest)); 7784068579eSTom Herbert } 7794068579eSTom Herbert 780db8dac20SDavid S. Miller /* 781db8dac20SDavid S. Miller * Note: called only from the BH handler context, 782db8dac20SDavid S. Miller * so we don't need to lock the hashes. 783db8dac20SDavid S. Miller */ 784e3163493SPavel Emelyanov static int __udp6_lib_mcast_deliver(struct net *net, struct sk_buff *skb, 785b71d1d42SEric Dumazet const struct in6_addr *saddr, const struct in6_addr *daddr, 78636cbb245SRick Jones struct udp_table *udptable, int proto) 787db8dac20SDavid S. Miller { 788a1ab77f9SEric Dumazet struct sock *sk, *stack[256 / sizeof(struct sock *)]; 789db8dac20SDavid S. Miller const struct udphdr *uh = udp_hdr(skb); 7905cf3d461SDavid Held struct hlist_nulls_node *node; 7915cf3d461SDavid Held unsigned short hnum = ntohs(uh->dest); 7925cf3d461SDavid Held struct udp_hslot *hslot = udp_hashslot(udptable, net, hnum); 7935cf3d461SDavid Held int dif = inet6_iif(skb); 7942dc41cffSDavid Held unsigned int count = 0, offset = offsetof(typeof(*sk), sk_nulls_node); 7952dc41cffSDavid Held unsigned int hash2 = 0, hash2_any = 0, use_hash2 = (hslot->count > 10); 79636cbb245SRick Jones bool inner_flushed = false; 7972dc41cffSDavid Held 7982dc41cffSDavid Held if (use_hash2) { 7992dc41cffSDavid Held hash2_any = udp6_portaddr_hash(net, &in6addr_any, hnum) & 8002dc41cffSDavid Held udp_table.mask; 8012dc41cffSDavid Held hash2 = udp6_portaddr_hash(net, daddr, hnum) & udp_table.mask; 8022dc41cffSDavid Held start_lookup: 8032dc41cffSDavid Held hslot = &udp_table.hash2[hash2]; 8042dc41cffSDavid Held offset = offsetof(typeof(*sk), __sk_common.skc_portaddr_node); 8052dc41cffSDavid Held } 806db8dac20SDavid S. Miller 807645ca708SEric Dumazet spin_lock(&hslot->lock); 8082dc41cffSDavid Held sk_nulls_for_each_entry_offset(sk, node, &hslot->head, offset) { 8095cf3d461SDavid Held if (__udp_v6_is_mcast_sock(net, sk, 8105cf3d461SDavid Held uh->dest, daddr, 8115cf3d461SDavid Held uh->source, saddr, 8125cf3d461SDavid Held dif, hnum) && 8131c19448cSTom Herbert /* If zero checksum and no_check is not on for 8144068579eSTom Herbert * the socket then skip it. 8154068579eSTom Herbert */ 8165cf3d461SDavid Held (uh->check || udp_sk(sk)->no_check6_rx)) { 817a1ab77f9SEric Dumazet if (unlikely(count == ARRAY_SIZE(stack))) { 818a1ab77f9SEric Dumazet flush_stack(stack, count, skb, ~0); 81936cbb245SRick Jones inner_flushed = true; 820a1ab77f9SEric Dumazet count = 0; 821db8dac20SDavid S. Miller } 8225cf3d461SDavid Held stack[count++] = sk; 8232dc41cffSDavid Held sock_hold(sk); 8245cf3d461SDavid Held } 825a1ab77f9SEric Dumazet } 826db8dac20SDavid S. Miller 827645ca708SEric Dumazet spin_unlock(&hslot->lock); 828a1ab77f9SEric Dumazet 8292dc41cffSDavid Held /* Also lookup *:port if we are using hash2 and haven't done so yet. */ 8302dc41cffSDavid Held if (use_hash2 && hash2 != hash2_any) { 8312dc41cffSDavid Held hash2 = hash2_any; 8322dc41cffSDavid Held goto start_lookup; 8332dc41cffSDavid Held } 8342dc41cffSDavid Held 835a1ab77f9SEric Dumazet if (count) { 836a1ab77f9SEric Dumazet flush_stack(stack, count, skb, count - 1); 837a1ab77f9SEric Dumazet } else { 83836cbb245SRick Jones if (!inner_flushed) 83936cbb245SRick Jones UDP_INC_STATS_BH(net, UDP_MIB_IGNOREDMULTI, 84036cbb245SRick Jones proto == IPPROTO_UDPLITE); 84136cbb245SRick Jones consume_skb(skb); 842a1ab77f9SEric Dumazet } 843db8dac20SDavid S. Miller return 0; 844db8dac20SDavid S. Miller } 845db8dac20SDavid S. Miller 846645ca708SEric Dumazet int __udp6_lib_rcv(struct sk_buff *skb, struct udp_table *udptable, 847db8dac20SDavid S. Miller int proto) 848db8dac20SDavid S. Miller { 8493ffe533cSAlexey Dobriyan struct net *net = dev_net(skb->dev); 850db8dac20SDavid S. Miller struct sock *sk; 851db8dac20SDavid S. Miller struct udphdr *uh; 852b71d1d42SEric Dumazet const struct in6_addr *saddr, *daddr; 853db8dac20SDavid S. Miller u32 ulen = 0; 854db8dac20SDavid S. Miller 855db8dac20SDavid S. Miller if (!pskb_may_pull(skb, sizeof(struct udphdr))) 856d6bc0149SBjørn Mork goto discard; 857db8dac20SDavid S. Miller 858db8dac20SDavid S. Miller saddr = &ipv6_hdr(skb)->saddr; 859db8dac20SDavid S. Miller daddr = &ipv6_hdr(skb)->daddr; 860db8dac20SDavid S. Miller uh = udp_hdr(skb); 861db8dac20SDavid S. Miller 862db8dac20SDavid S. Miller ulen = ntohs(uh->len); 863db8dac20SDavid S. Miller if (ulen > skb->len) 864db8dac20SDavid S. Miller goto short_packet; 865db8dac20SDavid S. Miller 866db8dac20SDavid S. Miller if (proto == IPPROTO_UDP) { 867db8dac20SDavid S. Miller /* UDP validates ulen. */ 868db8dac20SDavid S. Miller 869db8dac20SDavid S. Miller /* Check for jumbo payload */ 870db8dac20SDavid S. Miller if (ulen == 0) 871db8dac20SDavid S. Miller ulen = skb->len; 872db8dac20SDavid S. Miller 873db8dac20SDavid S. Miller if (ulen < sizeof(*uh)) 874db8dac20SDavid S. Miller goto short_packet; 875db8dac20SDavid S. Miller 876db8dac20SDavid S. Miller if (ulen < skb->len) { 877db8dac20SDavid S. Miller if (pskb_trim_rcsum(skb, ulen)) 878db8dac20SDavid S. Miller goto short_packet; 879db8dac20SDavid S. Miller saddr = &ipv6_hdr(skb)->saddr; 880db8dac20SDavid S. Miller daddr = &ipv6_hdr(skb)->daddr; 881db8dac20SDavid S. Miller uh = udp_hdr(skb); 882db8dac20SDavid S. Miller } 883db8dac20SDavid S. Miller } 884db8dac20SDavid S. Miller 885db8dac20SDavid S. Miller if (udp6_csum_init(skb, uh, proto)) 8866a5dc9e5SEric Dumazet goto csum_error; 887db8dac20SDavid S. Miller 888db8dac20SDavid S. Miller /* 889db8dac20SDavid S. Miller * Multicast receive code 890db8dac20SDavid S. Miller */ 891db8dac20SDavid S. Miller if (ipv6_addr_is_multicast(daddr)) 892e3163493SPavel Emelyanov return __udp6_lib_mcast_deliver(net, skb, 89336cbb245SRick Jones saddr, daddr, udptable, proto); 894db8dac20SDavid S. Miller 895db8dac20SDavid S. Miller /* Unicast */ 896db8dac20SDavid S. Miller 897db8dac20SDavid S. Miller /* 898db8dac20SDavid S. Miller * check socket cache ... must talk to Alan about his plans 899db8dac20SDavid S. Miller * for sock caches... i'll skip this for now. 900db8dac20SDavid S. Miller */ 901607c4aafSKOVACS Krisztian sk = __udp6_lib_lookup_skb(skb, uh->source, uh->dest, udptable); 902cb80ef46SBenjamin LaHaise if (sk != NULL) { 903a5b50476SEliezer Tamir int ret; 904a5b50476SEliezer Tamir 9051c19448cSTom Herbert if (!uh->check && !udp_sk(sk)->no_check6_rx) { 90679e0f1c9STom Herbert sock_put(sk); 9074068579eSTom Herbert udp6_csum_zero_error(skb); 9084068579eSTom Herbert goto csum_error; 9094068579eSTom Herbert } 9104068579eSTom Herbert 911224d019cSTom Herbert if (inet_get_convert_csum(sk) && uh->check && !IS_UDPLITE(sk)) 9122abb7cdcSTom Herbert skb_checksum_try_convert(skb, IPPROTO_UDP, uh->check, 9132abb7cdcSTom Herbert ip6_compute_pseudo); 9142abb7cdcSTom Herbert 915a5b50476SEliezer Tamir ret = udpv6_queue_rcv_skb(sk, skb); 916cb80ef46SBenjamin LaHaise sock_put(sk); 917db8dac20SDavid S. Miller 918cb80ef46SBenjamin LaHaise /* a return value > 0 means to resubmit the input, but 919cb80ef46SBenjamin LaHaise * it wants the return to be -protocol, or 0 920cb80ef46SBenjamin LaHaise */ 921cb80ef46SBenjamin LaHaise if (ret > 0) 922cb80ef46SBenjamin LaHaise return -ret; 923cb80ef46SBenjamin LaHaise 924cb80ef46SBenjamin LaHaise return 0; 925cb80ef46SBenjamin LaHaise } 926cb80ef46SBenjamin LaHaise 9274068579eSTom Herbert if (!uh->check) { 9284068579eSTom Herbert udp6_csum_zero_error(skb); 9294068579eSTom Herbert goto csum_error; 9304068579eSTom Herbert } 9314068579eSTom Herbert 932db8dac20SDavid S. Miller if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) 933db8dac20SDavid S. Miller goto discard; 934db8dac20SDavid S. Miller 935db8dac20SDavid S. Miller if (udp_lib_checksum_complete(skb)) 9366a5dc9e5SEric Dumazet goto csum_error; 937db8dac20SDavid S. Miller 938cb80ef46SBenjamin LaHaise UDP6_INC_STATS_BH(net, UDP_MIB_NOPORTS, proto == IPPROTO_UDPLITE); 9393ffe533cSAlexey Dobriyan icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0); 940db8dac20SDavid S. Miller 941db8dac20SDavid S. Miller kfree_skb(skb); 942db8dac20SDavid S. Miller return 0; 943db8dac20SDavid S. Miller 944db8dac20SDavid S. Miller short_packet: 945ba7a46f1SJoe Perches net_dbg_ratelimited("UDP%sv6: short packet: From [%pI6c]:%u %d/%d to [%pI6c]:%u\n", 946db8dac20SDavid S. Miller proto == IPPROTO_UDPLITE ? "-Lite" : "", 947ba7a46f1SJoe Perches saddr, ntohs(uh->source), 948ba7a46f1SJoe Perches ulen, skb->len, 949ba7a46f1SJoe Perches daddr, ntohs(uh->dest)); 9506a5dc9e5SEric Dumazet goto discard; 9516a5dc9e5SEric Dumazet csum_error: 9526a5dc9e5SEric Dumazet UDP6_INC_STATS_BH(net, UDP_MIB_CSUMERRORS, proto == IPPROTO_UDPLITE); 953db8dac20SDavid S. Miller discard: 954ef28d1a2SPavel Emelyanov UDP6_INC_STATS_BH(net, UDP_MIB_INERRORS, proto == IPPROTO_UDPLITE); 955db8dac20SDavid S. Miller kfree_skb(skb); 956db8dac20SDavid S. Miller return 0; 957db8dac20SDavid S. Miller } 958db8dac20SDavid S. Miller 959db8dac20SDavid S. Miller static __inline__ int udpv6_rcv(struct sk_buff *skb) 960db8dac20SDavid S. Miller { 961645ca708SEric Dumazet return __udp6_lib_rcv(skb, &udp_table, IPPROTO_UDP); 962db8dac20SDavid S. Miller } 963db8dac20SDavid S. Miller 964db8dac20SDavid S. Miller /* 965db8dac20SDavid S. Miller * Throw away all pending data and cancel the corking. Socket is locked. 966db8dac20SDavid S. Miller */ 967db8dac20SDavid S. Miller static void udp_v6_flush_pending_frames(struct sock *sk) 968db8dac20SDavid S. Miller { 969db8dac20SDavid S. Miller struct udp_sock *up = udp_sk(sk); 970db8dac20SDavid S. Miller 97136d926b9SDenis V. Lunev if (up->pending == AF_INET) 97236d926b9SDenis V. Lunev udp_flush_pending_frames(sk); 97336d926b9SDenis V. Lunev else if (up->pending) { 974db8dac20SDavid S. Miller up->len = 0; 975db8dac20SDavid S. Miller up->pending = 0; 976db8dac20SDavid S. Miller ip6_flush_pending_frames(sk); 977db8dac20SDavid S. Miller } 978db8dac20SDavid S. Miller } 979db8dac20SDavid S. Miller 980493c6be3SSridhar Samudrala /** 981493c6be3SSridhar Samudrala * udp6_hwcsum_outgoing - handle outgoing HW checksumming 982493c6be3SSridhar Samudrala * @sk: socket we are sending on 983493c6be3SSridhar Samudrala * @skb: sk_buff containing the filled-in UDP header 984493c6be3SSridhar Samudrala * (checksum field must be zeroed out) 985493c6be3SSridhar Samudrala */ 986493c6be3SSridhar Samudrala static void udp6_hwcsum_outgoing(struct sock *sk, struct sk_buff *skb, 987493c6be3SSridhar Samudrala const struct in6_addr *saddr, 988493c6be3SSridhar Samudrala const struct in6_addr *daddr, int len) 989493c6be3SSridhar Samudrala { 990493c6be3SSridhar Samudrala unsigned int offset; 991493c6be3SSridhar Samudrala struct udphdr *uh = udp_hdr(skb); 992d39d938cSVlad Yasevich struct sk_buff *frags = skb_shinfo(skb)->frag_list; 993493c6be3SSridhar Samudrala __wsum csum = 0; 994493c6be3SSridhar Samudrala 995d39d938cSVlad Yasevich if (!frags) { 996493c6be3SSridhar Samudrala /* Only one fragment on the socket. */ 997493c6be3SSridhar Samudrala skb->csum_start = skb_transport_header(skb) - skb->head; 998493c6be3SSridhar Samudrala skb->csum_offset = offsetof(struct udphdr, check); 999493c6be3SSridhar Samudrala uh->check = ~csum_ipv6_magic(saddr, daddr, len, IPPROTO_UDP, 0); 1000493c6be3SSridhar Samudrala } else { 1001493c6be3SSridhar Samudrala /* 1002493c6be3SSridhar Samudrala * HW-checksum won't work as there are two or more 1003493c6be3SSridhar Samudrala * fragments on the socket so that all csums of sk_buffs 1004493c6be3SSridhar Samudrala * should be together 1005493c6be3SSridhar Samudrala */ 1006493c6be3SSridhar Samudrala offset = skb_transport_offset(skb); 1007493c6be3SSridhar Samudrala skb->csum = skb_checksum(skb, offset, skb->len - offset, 0); 1008493c6be3SSridhar Samudrala 1009493c6be3SSridhar Samudrala skb->ip_summed = CHECKSUM_NONE; 1010493c6be3SSridhar Samudrala 1011d39d938cSVlad Yasevich do { 1012d39d938cSVlad Yasevich csum = csum_add(csum, frags->csum); 1013d39d938cSVlad Yasevich } while ((frags = frags->next)); 1014493c6be3SSridhar Samudrala 1015493c6be3SSridhar Samudrala uh->check = csum_ipv6_magic(saddr, daddr, len, IPPROTO_UDP, 1016493c6be3SSridhar Samudrala csum); 1017493c6be3SSridhar Samudrala if (uh->check == 0) 1018493c6be3SSridhar Samudrala uh->check = CSUM_MANGLED_0; 1019493c6be3SSridhar Samudrala } 1020493c6be3SSridhar Samudrala } 1021493c6be3SSridhar Samudrala 1022db8dac20SDavid S. Miller /* 1023db8dac20SDavid S. Miller * Sending 1024db8dac20SDavid S. Miller */ 1025db8dac20SDavid S. Miller 1026d39d938cSVlad Yasevich static int udp_v6_send_skb(struct sk_buff *skb, struct flowi6 *fl6) 1027db8dac20SDavid S. Miller { 1028d39d938cSVlad Yasevich struct sock *sk = skb->sk; 1029db8dac20SDavid S. Miller struct udphdr *uh; 1030db8dac20SDavid S. Miller int err = 0; 1031db8dac20SDavid S. Miller int is_udplite = IS_UDPLITE(sk); 1032db8dac20SDavid S. Miller __wsum csum = 0; 1033d39d938cSVlad Yasevich int offset = skb_transport_offset(skb); 1034d39d938cSVlad Yasevich int len = skb->len - offset; 1035db8dac20SDavid S. Miller 1036db8dac20SDavid S. Miller /* 1037db8dac20SDavid S. Miller * Create a UDP header 1038db8dac20SDavid S. Miller */ 1039db8dac20SDavid S. Miller uh = udp_hdr(skb); 10401958b856SDavid S. Miller uh->source = fl6->fl6_sport; 10411958b856SDavid S. Miller uh->dest = fl6->fl6_dport; 1042d39d938cSVlad Yasevich uh->len = htons(len); 1043db8dac20SDavid S. Miller uh->check = 0; 1044db8dac20SDavid S. Miller 1045db8dac20SDavid S. Miller if (is_udplite) 1046d39d938cSVlad Yasevich csum = udplite_csum(skb); 1047d39d938cSVlad Yasevich else if (udp_sk(sk)->no_check6_tx) { /* UDP csum disabled */ 10484068579eSTom Herbert skb->ip_summed = CHECKSUM_NONE; 10494068579eSTom Herbert goto send; 10504068579eSTom Herbert } else if (skb->ip_summed == CHECKSUM_PARTIAL) { /* UDP hardware csum */ 1051d39d938cSVlad Yasevich udp6_hwcsum_outgoing(sk, skb, &fl6->saddr, &fl6->daddr, len); 1052493c6be3SSridhar Samudrala goto send; 1053493c6be3SSridhar Samudrala } else 1054d39d938cSVlad Yasevich csum = udp_csum(skb); 1055db8dac20SDavid S. Miller 1056db8dac20SDavid S. Miller /* add protocol-dependent pseudo-header */ 10574c9483b2SDavid S. Miller uh->check = csum_ipv6_magic(&fl6->saddr, &fl6->daddr, 1058d39d938cSVlad Yasevich len, fl6->flowi6_proto, csum); 1059db8dac20SDavid S. Miller if (uh->check == 0) 1060db8dac20SDavid S. Miller uh->check = CSUM_MANGLED_0; 1061db8dac20SDavid S. Miller 1062493c6be3SSridhar Samudrala send: 1063d39d938cSVlad Yasevich err = ip6_send_skb(skb); 10646ce9e7b5SEric Dumazet if (err) { 10656ce9e7b5SEric Dumazet if (err == -ENOBUFS && !inet6_sk(sk)->recverr) { 10666ce9e7b5SEric Dumazet UDP6_INC_STATS_USER(sock_net(sk), 10676ce9e7b5SEric Dumazet UDP_MIB_SNDBUFERRORS, is_udplite); 10686ce9e7b5SEric Dumazet err = 0; 10696ce9e7b5SEric Dumazet } 10706ce9e7b5SEric Dumazet } else 10716ce9e7b5SEric Dumazet UDP6_INC_STATS_USER(sock_net(sk), 10726ce9e7b5SEric Dumazet UDP_MIB_OUTDATAGRAMS, is_udplite); 1073d39d938cSVlad Yasevich return err; 1074d39d938cSVlad Yasevich } 1075d39d938cSVlad Yasevich 1076d39d938cSVlad Yasevich static int udp_v6_push_pending_frames(struct sock *sk) 1077d39d938cSVlad Yasevich { 1078d39d938cSVlad Yasevich struct sk_buff *skb; 1079d39d938cSVlad Yasevich struct udp_sock *up = udp_sk(sk); 1080d39d938cSVlad Yasevich struct flowi6 fl6; 1081d39d938cSVlad Yasevich int err = 0; 1082d39d938cSVlad Yasevich 1083d39d938cSVlad Yasevich if (up->pending == AF_INET) 1084d39d938cSVlad Yasevich return udp_push_pending_frames(sk); 1085d39d938cSVlad Yasevich 1086d39d938cSVlad Yasevich /* ip6_finish_skb will release the cork, so make a copy of 1087d39d938cSVlad Yasevich * fl6 here. 1088d39d938cSVlad Yasevich */ 1089d39d938cSVlad Yasevich fl6 = inet_sk(sk)->cork.fl.u.ip6; 1090d39d938cSVlad Yasevich 1091d39d938cSVlad Yasevich skb = ip6_finish_skb(sk); 1092d39d938cSVlad Yasevich if (!skb) 1093d39d938cSVlad Yasevich goto out; 1094d39d938cSVlad Yasevich 1095d39d938cSVlad Yasevich err = udp_v6_send_skb(skb, &fl6); 1096d39d938cSVlad Yasevich 1097db8dac20SDavid S. Miller out: 1098db8dac20SDavid S. Miller up->len = 0; 1099db8dac20SDavid S. Miller up->pending = 0; 1100db8dac20SDavid S. Miller return err; 1101db8dac20SDavid S. Miller } 1102db8dac20SDavid S. Miller 11031b784140SYing Xue int udpv6_sendmsg(struct sock *sk, struct msghdr *msg, size_t len) 1104db8dac20SDavid S. Miller { 1105db8dac20SDavid S. Miller struct ipv6_txoptions opt_space; 1106db8dac20SDavid S. Miller struct udp_sock *up = udp_sk(sk); 1107db8dac20SDavid S. Miller struct inet_sock *inet = inet_sk(sk); 1108db8dac20SDavid S. Miller struct ipv6_pinfo *np = inet6_sk(sk); 1109342dfc30SSteffen Hurrle DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, msg->msg_name); 111020c59de2SArnaud Ebalard struct in6_addr *daddr, *final_p, final; 1111db8dac20SDavid S. Miller struct ipv6_txoptions *opt = NULL; 1112db8dac20SDavid S. Miller struct ip6_flowlabel *flowlabel = NULL; 11134c9483b2SDavid S. Miller struct flowi6 fl6; 1114db8dac20SDavid S. Miller struct dst_entry *dst; 1115db8dac20SDavid S. Miller int addr_len = msg->msg_namelen; 1116db8dac20SDavid S. Miller int ulen = len; 1117db8dac20SDavid S. Miller int hlimit = -1; 1118db8dac20SDavid S. Miller int tclass = -1; 111913b52cd4SBrian Haley int dontfrag = -1; 1120db8dac20SDavid S. Miller int corkreq = up->corkflag || msg->msg_flags&MSG_MORE; 1121db8dac20SDavid S. Miller int err; 1122db8dac20SDavid S. Miller int connected = 0; 1123db8dac20SDavid S. Miller int is_udplite = IS_UDPLITE(sk); 1124db8dac20SDavid S. Miller int (*getfrag)(void *, char *, int, int, int, struct sk_buff *); 1125db8dac20SDavid S. Miller 1126db8dac20SDavid S. Miller /* destination address check */ 1127db8dac20SDavid S. Miller if (sin6) { 1128db8dac20SDavid S. Miller if (addr_len < offsetof(struct sockaddr, sa_data)) 1129db8dac20SDavid S. Miller return -EINVAL; 1130db8dac20SDavid S. Miller 1131db8dac20SDavid S. Miller switch (sin6->sin6_family) { 1132db8dac20SDavid S. Miller case AF_INET6: 1133db8dac20SDavid S. Miller if (addr_len < SIN6_LEN_RFC2133) 1134db8dac20SDavid S. Miller return -EINVAL; 1135db8dac20SDavid S. Miller daddr = &sin6->sin6_addr; 1136db8dac20SDavid S. Miller break; 1137db8dac20SDavid S. Miller case AF_INET: 1138db8dac20SDavid S. Miller goto do_udp_sendmsg; 1139db8dac20SDavid S. Miller case AF_UNSPEC: 1140db8dac20SDavid S. Miller msg->msg_name = sin6 = NULL; 1141db8dac20SDavid S. Miller msg->msg_namelen = addr_len = 0; 1142db8dac20SDavid S. Miller daddr = NULL; 1143db8dac20SDavid S. Miller break; 1144db8dac20SDavid S. Miller default: 1145db8dac20SDavid S. Miller return -EINVAL; 1146db8dac20SDavid S. Miller } 1147db8dac20SDavid S. Miller } else if (!up->pending) { 1148db8dac20SDavid S. Miller if (sk->sk_state != TCP_ESTABLISHED) 1149db8dac20SDavid S. Miller return -EDESTADDRREQ; 1150efe4208fSEric Dumazet daddr = &sk->sk_v6_daddr; 1151db8dac20SDavid S. Miller } else 1152db8dac20SDavid S. Miller daddr = NULL; 1153db8dac20SDavid S. Miller 1154db8dac20SDavid S. Miller if (daddr) { 1155db8dac20SDavid S. Miller if (ipv6_addr_v4mapped(daddr)) { 1156db8dac20SDavid S. Miller struct sockaddr_in sin; 1157db8dac20SDavid S. Miller sin.sin_family = AF_INET; 1158c720c7e8SEric Dumazet sin.sin_port = sin6 ? sin6->sin6_port : inet->inet_dport; 1159db8dac20SDavid S. Miller sin.sin_addr.s_addr = daddr->s6_addr32[3]; 1160db8dac20SDavid S. Miller msg->msg_name = &sin; 1161db8dac20SDavid S. Miller msg->msg_namelen = sizeof(sin); 1162db8dac20SDavid S. Miller do_udp_sendmsg: 1163db8dac20SDavid S. Miller if (__ipv6_only_sock(sk)) 1164db8dac20SDavid S. Miller return -ENETUNREACH; 11651b784140SYing Xue return udp_sendmsg(sk, msg, len); 1166db8dac20SDavid S. Miller } 1167db8dac20SDavid S. Miller } 1168db8dac20SDavid S. Miller 1169db8dac20SDavid S. Miller if (up->pending == AF_INET) 11701b784140SYing Xue return udp_sendmsg(sk, msg, len); 1171db8dac20SDavid S. Miller 1172db8dac20SDavid S. Miller /* Rough check on arithmetic overflow, 1173db8dac20SDavid S. Miller better check is made in ip6_append_data(). 1174db8dac20SDavid S. Miller */ 1175db8dac20SDavid S. Miller if (len > INT_MAX - sizeof(struct udphdr)) 1176db8dac20SDavid S. Miller return -EMSGSIZE; 1177db8dac20SDavid S. Miller 117803485f2aSVlad Yasevich getfrag = is_udplite ? udplite_getfrag : ip_generic_getfrag; 1179db8dac20SDavid S. Miller if (up->pending) { 1180db8dac20SDavid S. Miller /* 1181db8dac20SDavid S. Miller * There are pending frames. 1182db8dac20SDavid S. Miller * The socket lock must be held while it's corked. 1183db8dac20SDavid S. Miller */ 1184db8dac20SDavid S. Miller lock_sock(sk); 1185db8dac20SDavid S. Miller if (likely(up->pending)) { 1186db8dac20SDavid S. Miller if (unlikely(up->pending != AF_INET6)) { 1187db8dac20SDavid S. Miller release_sock(sk); 1188db8dac20SDavid S. Miller return -EAFNOSUPPORT; 1189db8dac20SDavid S. Miller } 1190db8dac20SDavid S. Miller dst = NULL; 1191db8dac20SDavid S. Miller goto do_append_data; 1192db8dac20SDavid S. Miller } 1193db8dac20SDavid S. Miller release_sock(sk); 1194db8dac20SDavid S. Miller } 1195db8dac20SDavid S. Miller ulen += sizeof(struct udphdr); 1196db8dac20SDavid S. Miller 11974c9483b2SDavid S. Miller memset(&fl6, 0, sizeof(fl6)); 1198db8dac20SDavid S. Miller 1199db8dac20SDavid S. Miller if (sin6) { 1200db8dac20SDavid S. Miller if (sin6->sin6_port == 0) 1201db8dac20SDavid S. Miller return -EINVAL; 1202db8dac20SDavid S. Miller 12031958b856SDavid S. Miller fl6.fl6_dport = sin6->sin6_port; 1204db8dac20SDavid S. Miller daddr = &sin6->sin6_addr; 1205db8dac20SDavid S. Miller 1206db8dac20SDavid S. Miller if (np->sndflow) { 12074c9483b2SDavid S. Miller fl6.flowlabel = sin6->sin6_flowinfo&IPV6_FLOWINFO_MASK; 12084c9483b2SDavid S. Miller if (fl6.flowlabel&IPV6_FLOWLABEL_MASK) { 12094c9483b2SDavid S. Miller flowlabel = fl6_sock_lookup(sk, fl6.flowlabel); 121063159f29SIan Morris if (!flowlabel) 1211db8dac20SDavid S. Miller return -EINVAL; 1212db8dac20SDavid S. Miller } 1213db8dac20SDavid S. Miller } 1214db8dac20SDavid S. Miller 1215db8dac20SDavid S. Miller /* 1216db8dac20SDavid S. Miller * Otherwise it will be difficult to maintain 1217db8dac20SDavid S. Miller * sk->sk_dst_cache. 1218db8dac20SDavid S. Miller */ 1219db8dac20SDavid S. Miller if (sk->sk_state == TCP_ESTABLISHED && 1220efe4208fSEric Dumazet ipv6_addr_equal(daddr, &sk->sk_v6_daddr)) 1221efe4208fSEric Dumazet daddr = &sk->sk_v6_daddr; 1222db8dac20SDavid S. Miller 1223db8dac20SDavid S. Miller if (addr_len >= sizeof(struct sockaddr_in6) && 1224db8dac20SDavid S. Miller sin6->sin6_scope_id && 1225842df073SHannes Frederic Sowa __ipv6_addr_needs_scope_id(__ipv6_addr_type(daddr))) 12264c9483b2SDavid S. Miller fl6.flowi6_oif = sin6->sin6_scope_id; 1227db8dac20SDavid S. Miller } else { 1228db8dac20SDavid S. Miller if (sk->sk_state != TCP_ESTABLISHED) 1229db8dac20SDavid S. Miller return -EDESTADDRREQ; 1230db8dac20SDavid S. Miller 12311958b856SDavid S. Miller fl6.fl6_dport = inet->inet_dport; 1232efe4208fSEric Dumazet daddr = &sk->sk_v6_daddr; 12334c9483b2SDavid S. Miller fl6.flowlabel = np->flow_label; 1234db8dac20SDavid S. Miller connected = 1; 1235db8dac20SDavid S. Miller } 1236db8dac20SDavid S. Miller 12374c9483b2SDavid S. Miller if (!fl6.flowi6_oif) 12384c9483b2SDavid S. Miller fl6.flowi6_oif = sk->sk_bound_dev_if; 1239db8dac20SDavid S. Miller 12404c9483b2SDavid S. Miller if (!fl6.flowi6_oif) 12414c9483b2SDavid S. Miller fl6.flowi6_oif = np->sticky_pktinfo.ipi6_ifindex; 12429f690db7SYang Hongyang 12434c9483b2SDavid S. Miller fl6.flowi6_mark = sk->sk_mark; 124451953d5bSBrian Haley 1245db8dac20SDavid S. Miller if (msg->msg_controllen) { 1246db8dac20SDavid S. Miller opt = &opt_space; 1247db8dac20SDavid S. Miller memset(opt, 0, sizeof(struct ipv6_txoptions)); 1248db8dac20SDavid S. Miller opt->tot_len = sizeof(*opt); 1249db8dac20SDavid S. Miller 125073df66f8STom Parkin err = ip6_datagram_send_ctl(sock_net(sk), sk, msg, &fl6, opt, 1251ec0506dbSMaciej Żenczykowski &hlimit, &tclass, &dontfrag); 1252db8dac20SDavid S. Miller if (err < 0) { 1253db8dac20SDavid S. Miller fl6_sock_release(flowlabel); 1254db8dac20SDavid S. Miller return err; 1255db8dac20SDavid S. Miller } 12564c9483b2SDavid S. Miller if ((fl6.flowlabel&IPV6_FLOWLABEL_MASK) && !flowlabel) { 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 if (!(opt->opt_nflen|opt->opt_flen)) 1262db8dac20SDavid S. Miller opt = NULL; 1263db8dac20SDavid S. Miller connected = 0; 1264db8dac20SDavid S. Miller } 126563159f29SIan Morris if (!opt) 1266db8dac20SDavid S. Miller opt = np->opt; 1267db8dac20SDavid S. Miller if (flowlabel) 1268db8dac20SDavid S. Miller opt = fl6_merge_options(&opt_space, flowlabel, opt); 1269db8dac20SDavid S. Miller opt = ipv6_fixup_options(&opt_space, opt); 1270db8dac20SDavid S. Miller 12714c9483b2SDavid S. Miller fl6.flowi6_proto = sk->sk_protocol; 1272876c7f41SBrian Haley if (!ipv6_addr_any(daddr)) 12734e3fd7a0SAlexey Dobriyan fl6.daddr = *daddr; 1274876c7f41SBrian Haley else 12754c9483b2SDavid S. Miller fl6.daddr.s6_addr[15] = 0x1; /* :: means loopback (BSD'ism) */ 12764c9483b2SDavid S. Miller if (ipv6_addr_any(&fl6.saddr) && !ipv6_addr_any(&np->saddr)) 12774e3fd7a0SAlexey Dobriyan fl6.saddr = np->saddr; 12781958b856SDavid S. Miller fl6.fl6_sport = inet->inet_sport; 1279db8dac20SDavid S. Miller 12804c9483b2SDavid S. Miller final_p = fl6_update_dst(&fl6, opt, &final); 128120c59de2SArnaud Ebalard if (final_p) 1282db8dac20SDavid S. Miller connected = 0; 1283db8dac20SDavid S. Miller 12844c9483b2SDavid S. Miller if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr)) { 12854c9483b2SDavid S. Miller fl6.flowi6_oif = np->mcast_oif; 1286db8dac20SDavid S. Miller connected = 0; 1287c4062dfcSErich E. Hoover } else if (!fl6.flowi6_oif) 1288c4062dfcSErich E. Hoover fl6.flowi6_oif = np->ucast_oif; 1289db8dac20SDavid S. Miller 12904c9483b2SDavid S. Miller security_sk_classify_flow(sk, flowi6_to_flowi(&fl6)); 1291db8dac20SDavid S. Miller 12920e0d44abSSteffen Klassert dst = ip6_sk_dst_lookup_flow(sk, &fl6, final_p); 129368d0c6d3SDavid S. Miller if (IS_ERR(dst)) { 129468d0c6d3SDavid S. Miller err = PTR_ERR(dst); 129568d0c6d3SDavid S. Miller dst = NULL; 1296db8dac20SDavid S. Miller goto out; 1297db8dac20SDavid S. Miller } 1298db8dac20SDavid S. Miller 1299db8dac20SDavid S. Miller if (hlimit < 0) 13005c98631cSLorenzo Colitti hlimit = ip6_sk_dst_hoplimit(np, &fl6, dst); 1301db8dac20SDavid S. Miller 1302db8dac20SDavid S. Miller if (tclass < 0) 1303e651f03aSGerrit Renker tclass = np->tclass; 1304db8dac20SDavid S. Miller 1305db8dac20SDavid S. Miller if (msg->msg_flags&MSG_CONFIRM) 1306db8dac20SDavid S. Miller goto do_confirm; 1307db8dac20SDavid S. Miller back_from_confirm: 1308db8dac20SDavid S. Miller 130903485f2aSVlad Yasevich /* Lockless fast path for the non-corking case */ 131003485f2aSVlad Yasevich if (!corkreq) { 131103485f2aSVlad Yasevich struct sk_buff *skb; 131203485f2aSVlad Yasevich 131303485f2aSVlad Yasevich skb = ip6_make_skb(sk, getfrag, msg, ulen, 131403485f2aSVlad Yasevich sizeof(struct udphdr), hlimit, tclass, opt, 131503485f2aSVlad Yasevich &fl6, (struct rt6_info *)dst, 131603485f2aSVlad Yasevich msg->msg_flags, dontfrag); 131703485f2aSVlad Yasevich err = PTR_ERR(skb); 131803485f2aSVlad Yasevich if (!IS_ERR_OR_NULL(skb)) 131903485f2aSVlad Yasevich err = udp_v6_send_skb(skb, &fl6); 132003485f2aSVlad Yasevich goto release_dst; 132103485f2aSVlad Yasevich } 132203485f2aSVlad Yasevich 1323db8dac20SDavid S. Miller lock_sock(sk); 1324db8dac20SDavid S. Miller if (unlikely(up->pending)) { 1325db8dac20SDavid S. Miller /* The socket is already corked while preparing it. */ 1326db8dac20SDavid S. Miller /* ... which is an evident application bug. --ANK */ 1327db8dac20SDavid S. Miller release_sock(sk); 1328db8dac20SDavid S. Miller 1329ba7a46f1SJoe Perches net_dbg_ratelimited("udp cork app bug 2\n"); 1330db8dac20SDavid S. Miller err = -EINVAL; 1331db8dac20SDavid S. Miller goto out; 1332db8dac20SDavid S. Miller } 1333db8dac20SDavid S. Miller 1334db8dac20SDavid S. Miller up->pending = AF_INET6; 1335db8dac20SDavid S. Miller 1336db8dac20SDavid S. Miller do_append_data: 1337e36d3ff9SJiri Pirko if (dontfrag < 0) 1338e36d3ff9SJiri Pirko dontfrag = np->dontfrag; 1339db8dac20SDavid S. Miller up->len += ulen; 1340f69e6d13SAl Viro err = ip6_append_data(sk, getfrag, msg, ulen, 13414c9483b2SDavid S. Miller sizeof(struct udphdr), hlimit, tclass, opt, &fl6, 1342db8dac20SDavid S. Miller (struct rt6_info *)dst, 134313b52cd4SBrian Haley corkreq ? msg->msg_flags|MSG_MORE : msg->msg_flags, dontfrag); 1344db8dac20SDavid S. Miller if (err) 1345db8dac20SDavid S. Miller udp_v6_flush_pending_frames(sk); 1346db8dac20SDavid S. Miller else if (!corkreq) 1347db8dac20SDavid S. Miller err = udp_v6_push_pending_frames(sk); 1348db8dac20SDavid S. Miller else if (unlikely(skb_queue_empty(&sk->sk_write_queue))) 1349db8dac20SDavid S. Miller up->pending = 0; 1350db8dac20SDavid S. Miller 135103485f2aSVlad Yasevich if (err > 0) 135203485f2aSVlad Yasevich err = np->recverr ? net_xmit_errno(err) : 0; 135303485f2aSVlad Yasevich release_sock(sk); 135403485f2aSVlad Yasevich 135503485f2aSVlad Yasevich release_dst: 1356db8dac20SDavid S. Miller if (dst) { 1357db8dac20SDavid S. Miller if (connected) { 1358db8dac20SDavid S. Miller ip6_dst_store(sk, dst, 1359efe4208fSEric Dumazet ipv6_addr_equal(&fl6.daddr, &sk->sk_v6_daddr) ? 1360efe4208fSEric Dumazet &sk->sk_v6_daddr : NULL, 1361db8dac20SDavid S. Miller #ifdef CONFIG_IPV6_SUBTREES 13624c9483b2SDavid S. Miller ipv6_addr_equal(&fl6.saddr, &np->saddr) ? 1363db8dac20SDavid S. Miller &np->saddr : 1364db8dac20SDavid S. Miller #endif 1365db8dac20SDavid S. Miller NULL); 1366db8dac20SDavid S. Miller } else { 1367db8dac20SDavid S. Miller dst_release(dst); 1368db8dac20SDavid S. Miller } 1369a3c96089SYOSHIFUJI Hideaki dst = NULL; 1370db8dac20SDavid S. Miller } 1371db8dac20SDavid S. Miller 1372db8dac20SDavid S. Miller out: 1373a3c96089SYOSHIFUJI Hideaki dst_release(dst); 1374db8dac20SDavid S. Miller fl6_sock_release(flowlabel); 1375db8dac20SDavid S. Miller if (!err) 1376db8dac20SDavid S. Miller return len; 1377db8dac20SDavid S. Miller /* 1378db8dac20SDavid S. Miller * ENOBUFS = no kernel mem, SOCK_NOSPACE = no sndbuf space. Reporting 1379db8dac20SDavid S. Miller * ENOBUFS might not be good (it's not tunable per se), but otherwise 1380db8dac20SDavid S. Miller * we don't have a good statistic (IpOutDiscards but it can be too many 1381db8dac20SDavid S. Miller * things). We could add another new stat but at least for now that 1382db8dac20SDavid S. Miller * seems like overkill. 1383db8dac20SDavid S. Miller */ 1384db8dac20SDavid S. Miller if (err == -ENOBUFS || test_bit(SOCK_NOSPACE, &sk->sk_socket->flags)) { 1385235b9f7aSPavel Emelyanov UDP6_INC_STATS_USER(sock_net(sk), 1386235b9f7aSPavel Emelyanov UDP_MIB_SNDBUFERRORS, is_udplite); 1387db8dac20SDavid S. Miller } 1388db8dac20SDavid S. Miller return err; 1389db8dac20SDavid S. Miller 1390db8dac20SDavid S. Miller do_confirm: 1391db8dac20SDavid S. Miller dst_confirm(dst); 1392db8dac20SDavid S. Miller if (!(msg->msg_flags&MSG_PROBE) || len) 1393db8dac20SDavid S. Miller goto back_from_confirm; 1394db8dac20SDavid S. Miller err = 0; 1395db8dac20SDavid S. Miller goto out; 1396db8dac20SDavid S. Miller } 1397db8dac20SDavid S. Miller 13987d06b2e0SBrian Haley void udpv6_destroy_sock(struct sock *sk) 1399db8dac20SDavid S. Miller { 140044046a59STom Parkin struct udp_sock *up = udp_sk(sk); 1401db8dac20SDavid S. Miller lock_sock(sk); 1402db8dac20SDavid S. Miller udp_v6_flush_pending_frames(sk); 1403db8dac20SDavid S. Miller release_sock(sk); 1404db8dac20SDavid S. Miller 140544046a59STom Parkin if (static_key_false(&udpv6_encap_needed) && up->encap_type) { 140644046a59STom Parkin void (*encap_destroy)(struct sock *sk); 140744046a59STom Parkin encap_destroy = ACCESS_ONCE(up->encap_destroy); 140844046a59STom Parkin if (encap_destroy) 140944046a59STom Parkin encap_destroy(sk); 141044046a59STom Parkin } 141144046a59STom Parkin 1412db8dac20SDavid S. Miller inet6_destroy_sock(sk); 1413db8dac20SDavid S. Miller } 1414db8dac20SDavid S. Miller 1415db8dac20SDavid S. Miller /* 1416db8dac20SDavid S. Miller * Socket option code for UDP 1417db8dac20SDavid S. Miller */ 1418db8dac20SDavid S. Miller int udpv6_setsockopt(struct sock *sk, int level, int optname, 1419b7058842SDavid S. Miller char __user *optval, unsigned int optlen) 1420db8dac20SDavid S. Miller { 1421db8dac20SDavid S. Miller if (level == SOL_UDP || level == SOL_UDPLITE) 1422db8dac20SDavid S. Miller return udp_lib_setsockopt(sk, level, optname, optval, optlen, 1423db8dac20SDavid S. Miller udp_v6_push_pending_frames); 1424db8dac20SDavid S. Miller return ipv6_setsockopt(sk, level, optname, optval, optlen); 1425db8dac20SDavid S. Miller } 1426db8dac20SDavid S. Miller 1427db8dac20SDavid S. Miller #ifdef CONFIG_COMPAT 1428db8dac20SDavid S. Miller int compat_udpv6_setsockopt(struct sock *sk, int level, int optname, 1429b7058842SDavid S. Miller char __user *optval, unsigned int optlen) 1430db8dac20SDavid S. Miller { 1431db8dac20SDavid S. Miller if (level == SOL_UDP || level == SOL_UDPLITE) 1432db8dac20SDavid S. Miller return udp_lib_setsockopt(sk, level, optname, optval, optlen, 1433db8dac20SDavid S. Miller udp_v6_push_pending_frames); 1434db8dac20SDavid S. Miller return compat_ipv6_setsockopt(sk, level, optname, optval, optlen); 1435db8dac20SDavid S. Miller } 1436db8dac20SDavid S. Miller #endif 1437db8dac20SDavid S. Miller 1438db8dac20SDavid S. Miller int udpv6_getsockopt(struct sock *sk, int level, int optname, 1439db8dac20SDavid S. Miller char __user *optval, int __user *optlen) 1440db8dac20SDavid S. Miller { 1441db8dac20SDavid S. Miller if (level == SOL_UDP || level == SOL_UDPLITE) 1442db8dac20SDavid S. Miller return udp_lib_getsockopt(sk, level, optname, optval, optlen); 1443db8dac20SDavid S. Miller return ipv6_getsockopt(sk, level, optname, optval, optlen); 1444db8dac20SDavid S. Miller } 1445db8dac20SDavid S. Miller 1446db8dac20SDavid S. Miller #ifdef CONFIG_COMPAT 1447db8dac20SDavid S. Miller int compat_udpv6_getsockopt(struct sock *sk, int level, int optname, 1448db8dac20SDavid S. Miller char __user *optval, int __user *optlen) 1449db8dac20SDavid S. Miller { 1450db8dac20SDavid S. Miller if (level == SOL_UDP || level == SOL_UDPLITE) 1451db8dac20SDavid S. Miller return udp_lib_getsockopt(sk, level, optname, optval, optlen); 1452db8dac20SDavid S. Miller return compat_ipv6_getsockopt(sk, level, optname, optval, optlen); 1453db8dac20SDavid S. Miller } 1454db8dac20SDavid S. Miller #endif 1455db8dac20SDavid S. Miller 145641135cc8SAlexey Dobriyan static const struct inet6_protocol udpv6_protocol = { 1457db8dac20SDavid S. Miller .handler = udpv6_rcv, 1458db8dac20SDavid S. Miller .err_handler = udpv6_err, 1459db8dac20SDavid S. Miller .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL, 1460db8dac20SDavid S. Miller }; 1461db8dac20SDavid S. Miller 1462db8dac20SDavid S. Miller /* ------------------------------------------------------------------------ */ 1463db8dac20SDavid S. Miller #ifdef CONFIG_PROC_FS 1464db8dac20SDavid S. Miller int udp6_seq_show(struct seq_file *seq, void *v) 1465db8dac20SDavid S. Miller { 146617ef66afSLorenzo Colitti if (v == SEQ_START_TOKEN) { 146717ef66afSLorenzo Colitti seq_puts(seq, IPV6_SEQ_DGRAM_HEADER); 146817ef66afSLorenzo Colitti } else { 146917ef66afSLorenzo Colitti int bucket = ((struct udp_iter_state *)seq->private)->bucket; 147017ef66afSLorenzo Colitti struct inet_sock *inet = inet_sk(v); 147117ef66afSLorenzo Colitti __u16 srcp = ntohs(inet->inet_sport); 147217ef66afSLorenzo Colitti __u16 destp = ntohs(inet->inet_dport); 147317ef66afSLorenzo Colitti ip6_dgram_sock_seq_show(seq, v, srcp, destp, bucket); 147417ef66afSLorenzo Colitti } 1475db8dac20SDavid S. Miller return 0; 1476db8dac20SDavid S. Miller } 1477db8dac20SDavid S. Miller 147873cb88ecSArjan van de Ven static const struct file_operations udp6_afinfo_seq_fops = { 147973cb88ecSArjan van de Ven .owner = THIS_MODULE, 148073cb88ecSArjan van de Ven .open = udp_seq_open, 148173cb88ecSArjan van de Ven .read = seq_read, 148273cb88ecSArjan van de Ven .llseek = seq_lseek, 148373cb88ecSArjan van de Ven .release = seq_release_net 148473cb88ecSArjan van de Ven }; 148573cb88ecSArjan van de Ven 1486db8dac20SDavid S. Miller static struct udp_seq_afinfo udp6_seq_afinfo = { 1487db8dac20SDavid S. Miller .name = "udp6", 1488db8dac20SDavid S. Miller .family = AF_INET6, 1489645ca708SEric Dumazet .udp_table = &udp_table, 149073cb88ecSArjan van de Ven .seq_fops = &udp6_afinfo_seq_fops, 1491dda61925SDenis V. Lunev .seq_ops = { 1492dda61925SDenis V. Lunev .show = udp6_seq_show, 1493dda61925SDenis V. Lunev }, 1494db8dac20SDavid S. Miller }; 1495db8dac20SDavid S. Miller 14962c8c1e72SAlexey Dobriyan int __net_init udp6_proc_init(struct net *net) 1497db8dac20SDavid S. Miller { 14980c96d8c5SDaniel Lezcano return udp_proc_register(net, &udp6_seq_afinfo); 1499db8dac20SDavid S. Miller } 1500db8dac20SDavid S. Miller 15010c96d8c5SDaniel Lezcano void udp6_proc_exit(struct net *net) { 15020c96d8c5SDaniel Lezcano udp_proc_unregister(net, &udp6_seq_afinfo); 1503db8dac20SDavid S. Miller } 1504db8dac20SDavid S. Miller #endif /* CONFIG_PROC_FS */ 1505db8dac20SDavid S. Miller 1506f77d6021SEric Dumazet void udp_v6_clear_sk(struct sock *sk, int size) 1507f77d6021SEric Dumazet { 1508f77d6021SEric Dumazet struct inet_sock *inet = inet_sk(sk); 1509f77d6021SEric Dumazet 1510f77d6021SEric Dumazet /* we do not want to clear pinet6 field, because of RCU lookups */ 1511f77d6021SEric Dumazet sk_prot_clear_portaddr_nulls(sk, offsetof(struct inet_sock, pinet6)); 1512f77d6021SEric Dumazet 1513f77d6021SEric Dumazet size -= offsetof(struct inet_sock, pinet6) + sizeof(inet->pinet6); 1514f77d6021SEric Dumazet memset(&inet->pinet6 + 1, 0, size); 1515f77d6021SEric Dumazet } 1516f77d6021SEric Dumazet 1517db8dac20SDavid S. Miller /* ------------------------------------------------------------------------ */ 1518db8dac20SDavid S. Miller 1519db8dac20SDavid S. Miller struct proto udpv6_prot = { 1520db8dac20SDavid S. Miller .name = "UDPv6", 1521db8dac20SDavid S. Miller .owner = THIS_MODULE, 1522db8dac20SDavid S. Miller .close = udp_lib_close, 1523db8dac20SDavid S. Miller .connect = ip6_datagram_connect, 1524db8dac20SDavid S. Miller .disconnect = udp_disconnect, 1525db8dac20SDavid S. Miller .ioctl = udp_ioctl, 1526db8dac20SDavid S. Miller .destroy = udpv6_destroy_sock, 1527db8dac20SDavid S. Miller .setsockopt = udpv6_setsockopt, 1528db8dac20SDavid S. Miller .getsockopt = udpv6_getsockopt, 1529db8dac20SDavid S. Miller .sendmsg = udpv6_sendmsg, 1530db8dac20SDavid S. Miller .recvmsg = udpv6_recvmsg, 1531f7ad74feSBenjamin LaHaise .backlog_rcv = __udpv6_queue_rcv_skb, 1532db8dac20SDavid S. Miller .hash = udp_lib_hash, 1533db8dac20SDavid S. Miller .unhash = udp_lib_unhash, 1534719f8358SEric Dumazet .rehash = udp_v6_rehash, 1535db8dac20SDavid S. Miller .get_port = udp_v6_get_port, 1536db8dac20SDavid S. Miller .memory_allocated = &udp_memory_allocated, 1537db8dac20SDavid S. Miller .sysctl_mem = sysctl_udp_mem, 1538db8dac20SDavid S. Miller .sysctl_wmem = &sysctl_udp_wmem_min, 1539db8dac20SDavid S. Miller .sysctl_rmem = &sysctl_udp_rmem_min, 1540db8dac20SDavid S. Miller .obj_size = sizeof(struct udp6_sock), 1541271b72c7SEric Dumazet .slab_flags = SLAB_DESTROY_BY_RCU, 1542645ca708SEric Dumazet .h.udp_table = &udp_table, 1543db8dac20SDavid S. Miller #ifdef CONFIG_COMPAT 1544db8dac20SDavid S. Miller .compat_setsockopt = compat_udpv6_setsockopt, 1545db8dac20SDavid S. Miller .compat_getsockopt = compat_udpv6_getsockopt, 1546db8dac20SDavid S. Miller #endif 1547f77d6021SEric Dumazet .clear_sk = udp_v6_clear_sk, 1548db8dac20SDavid S. Miller }; 1549db8dac20SDavid S. Miller 1550db8dac20SDavid S. Miller static struct inet_protosw udpv6_protosw = { 1551db8dac20SDavid S. Miller .type = SOCK_DGRAM, 1552db8dac20SDavid S. Miller .protocol = IPPROTO_UDP, 1553db8dac20SDavid S. Miller .prot = &udpv6_prot, 1554db8dac20SDavid S. Miller .ops = &inet6_dgram_ops, 1555db8dac20SDavid S. Miller .flags = INET_PROTOSW_PERMANENT, 1556db8dac20SDavid S. Miller }; 1557db8dac20SDavid S. Miller 1558db8dac20SDavid S. Miller 1559db8dac20SDavid S. Miller int __init udpv6_init(void) 1560db8dac20SDavid S. Miller { 1561db8dac20SDavid S. Miller int ret; 1562db8dac20SDavid S. Miller 15633336288aSVlad Yasevich ret = inet6_add_protocol(&udpv6_protocol, IPPROTO_UDP); 15643336288aSVlad Yasevich if (ret) 1565c6b641a4SVlad Yasevich goto out; 15663336288aSVlad Yasevich 1567db8dac20SDavid S. Miller ret = inet6_register_protosw(&udpv6_protosw); 1568db8dac20SDavid S. Miller if (ret) 1569db8dac20SDavid S. Miller goto out_udpv6_protocol; 1570db8dac20SDavid S. Miller out: 1571db8dac20SDavid S. Miller return ret; 1572db8dac20SDavid S. Miller 1573db8dac20SDavid S. Miller out_udpv6_protocol: 1574db8dac20SDavid S. Miller inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP); 1575db8dac20SDavid S. Miller goto out; 1576db8dac20SDavid S. Miller } 1577db8dac20SDavid S. Miller 1578db8dac20SDavid S. Miller void udpv6_exit(void) 1579db8dac20SDavid S. Miller { 1580db8dac20SDavid S. Miller inet6_unregister_protosw(&udpv6_protosw); 1581db8dac20SDavid S. Miller inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP); 1582db8dac20SDavid S. Miller } 1583