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 40496611d7SCraig Gallek #include <net/addrconf.h> 41db8dac20SDavid S. Miller #include <net/ndisc.h> 42db8dac20SDavid S. Miller #include <net/protocol.h> 43db8dac20SDavid S. Miller #include <net/transp_v6.h> 44db8dac20SDavid S. Miller #include <net/ip6_route.h> 45db8dac20SDavid S. Miller #include <net/raw.h> 46db8dac20SDavid S. Miller #include <net/tcp_states.h> 47db8dac20SDavid S. Miller #include <net/ip6_checksum.h> 48db8dac20SDavid S. Miller #include <net/xfrm.h> 4972289b96STom Herbert #include <net/inet6_hashtables.h> 50076bb0c8SEliezer Tamir #include <net/busy_poll.h> 51e32ea7e7SCraig Gallek #include <net/sock_reuseport.h> 52db8dac20SDavid S. Miller 53db8dac20SDavid S. Miller #include <linux/proc_fs.h> 54db8dac20SDavid S. Miller #include <linux/seq_file.h> 5522911fc5SEric Dumazet #include <trace/events/skb.h> 56db8dac20SDavid S. Miller #include "udp_impl.h" 57db8dac20SDavid S. Miller 586eada011SEric Dumazet static u32 udp6_ehashfn(const struct net *net, 59b50026b5SHannes Frederic Sowa const struct in6_addr *laddr, 60b50026b5SHannes Frederic Sowa const u16 lport, 61b50026b5SHannes Frederic Sowa const struct in6_addr *faddr, 62b50026b5SHannes Frederic Sowa const __be16 fport) 63b50026b5SHannes Frederic Sowa { 641bbdceefSHannes Frederic Sowa static u32 udp6_ehash_secret __read_mostly; 651bbdceefSHannes Frederic Sowa static u32 udp_ipv6_hash_secret __read_mostly; 661bbdceefSHannes Frederic Sowa 671bbdceefSHannes Frederic Sowa u32 lhash, fhash; 681bbdceefSHannes Frederic Sowa 691bbdceefSHannes Frederic Sowa net_get_random_once(&udp6_ehash_secret, 701bbdceefSHannes Frederic Sowa sizeof(udp6_ehash_secret)); 711bbdceefSHannes Frederic Sowa net_get_random_once(&udp_ipv6_hash_secret, 721bbdceefSHannes Frederic Sowa sizeof(udp_ipv6_hash_secret)); 731bbdceefSHannes Frederic Sowa 741bbdceefSHannes Frederic Sowa lhash = (__force u32)laddr->s6_addr32[3]; 751bbdceefSHannes Frederic Sowa fhash = __ipv6_addr_jhash(faddr, udp_ipv6_hash_secret); 761bbdceefSHannes Frederic Sowa 77b50026b5SHannes Frederic Sowa return __inet6_ehashfn(lhash, lport, fhash, fport, 781bbdceefSHannes Frederic Sowa udp_ipv6_hash_secret + net_hash_mix(net)); 79b50026b5SHannes Frederic Sowa } 80b50026b5SHannes Frederic Sowa 816eada011SEric Dumazet static u32 udp6_portaddr_hash(const struct net *net, 82d4cada4aSEric Dumazet const struct in6_addr *addr6, 83d4cada4aSEric Dumazet unsigned int port) 84d4cada4aSEric Dumazet { 85d4cada4aSEric Dumazet unsigned int hash, mix = net_hash_mix(net); 86d4cada4aSEric Dumazet 87d4cada4aSEric Dumazet if (ipv6_addr_any(addr6)) 88d4cada4aSEric Dumazet hash = jhash_1word(0, mix); 89856540eeSBrian Haley else if (ipv6_addr_v4mapped(addr6)) 900eae88f3SEric Dumazet hash = jhash_1word((__force u32)addr6->s6_addr32[3], mix); 91d4cada4aSEric Dumazet else 920eae88f3SEric Dumazet hash = jhash2((__force u32 *)addr6->s6_addr32, 4, mix); 93d4cada4aSEric Dumazet 94d4cada4aSEric Dumazet return hash ^ port; 95d4cada4aSEric Dumazet } 96d4cada4aSEric Dumazet 976ba5a3c5SPavel Emelyanov int udp_v6_get_port(struct sock *sk, unsigned short snum) 98db8dac20SDavid S. Miller { 9930fff923SEric Dumazet unsigned int hash2_nulladdr = 10030fff923SEric Dumazet udp6_portaddr_hash(sock_net(sk), &in6addr_any, snum); 10130fff923SEric Dumazet unsigned int hash2_partial = 102efe4208fSEric Dumazet udp6_portaddr_hash(sock_net(sk), &sk->sk_v6_rcv_saddr, 0); 10330fff923SEric Dumazet 104d4cada4aSEric Dumazet /* precompute partial secondary hash */ 10530fff923SEric Dumazet udp_sk(sk)->udp_portaddr_hash = hash2_partial; 10630fff923SEric Dumazet return udp_lib_get_port(sk, snum, ipv6_rcv_saddr_equal, hash2_nulladdr); 107db8dac20SDavid S. Miller } 108db8dac20SDavid S. Miller 109719f8358SEric Dumazet static void udp_v6_rehash(struct sock *sk) 110719f8358SEric Dumazet { 111719f8358SEric Dumazet u16 new_hash = udp6_portaddr_hash(sock_net(sk), 112efe4208fSEric Dumazet &sk->sk_v6_rcv_saddr, 113719f8358SEric Dumazet inet_sk(sk)->inet_num); 114719f8358SEric Dumazet 115719f8358SEric Dumazet udp_lib_rehash(sk, new_hash); 116719f8358SEric Dumazet } 117719f8358SEric Dumazet 118645ca708SEric Dumazet static inline int compute_score(struct sock *sk, struct net *net, 119645ca708SEric Dumazet unsigned short hnum, 12088440ae7SBalazs Scheidler const struct in6_addr *saddr, __be16 sport, 12188440ae7SBalazs Scheidler const struct in6_addr *daddr, __be16 dport, 122645ca708SEric Dumazet int dif) 123db8dac20SDavid S. Miller { 12460c04aecSJoe Perches int score; 12560c04aecSJoe Perches struct inet_sock *inet; 126db8dac20SDavid S. Miller 12760c04aecSJoe Perches if (!net_eq(sock_net(sk), net) || 12860c04aecSJoe Perches udp_sk(sk)->udp_port_hash != hnum || 12960c04aecSJoe Perches sk->sk_family != PF_INET6) 13060c04aecSJoe Perches return -1; 131645ca708SEric Dumazet 132645ca708SEric Dumazet score = 0; 13360c04aecSJoe Perches inet = inet_sk(sk); 13460c04aecSJoe Perches 135c720c7e8SEric Dumazet if (inet->inet_dport) { 136c720c7e8SEric Dumazet if (inet->inet_dport != sport) 137645ca708SEric Dumazet return -1; 138db8dac20SDavid S. Miller score++; 139db8dac20SDavid S. Miller } 14060c04aecSJoe Perches 141efe4208fSEric Dumazet if (!ipv6_addr_any(&sk->sk_v6_rcv_saddr)) { 142efe4208fSEric Dumazet if (!ipv6_addr_equal(&sk->sk_v6_rcv_saddr, daddr)) 143645ca708SEric Dumazet return -1; 144db8dac20SDavid S. Miller score++; 145db8dac20SDavid S. Miller } 14660c04aecSJoe Perches 147efe4208fSEric Dumazet if (!ipv6_addr_any(&sk->sk_v6_daddr)) { 148efe4208fSEric Dumazet if (!ipv6_addr_equal(&sk->sk_v6_daddr, saddr)) 149645ca708SEric Dumazet return -1; 150db8dac20SDavid S. Miller score++; 151db8dac20SDavid S. Miller } 15260c04aecSJoe Perches 153db8dac20SDavid S. Miller if (sk->sk_bound_dev_if) { 154db8dac20SDavid S. Miller if (sk->sk_bound_dev_if != dif) 155645ca708SEric Dumazet return -1; 156db8dac20SDavid S. Miller score++; 157db8dac20SDavid S. Miller } 15860c04aecSJoe Perches 15970da268bSEric Dumazet if (sk->sk_incoming_cpu == raw_smp_processor_id()) 16070da268bSEric Dumazet score++; 16170da268bSEric Dumazet 162645ca708SEric Dumazet return score; 163645ca708SEric Dumazet } 164645ca708SEric Dumazet 165fddc17deSEric Dumazet static inline int compute_score2(struct sock *sk, struct net *net, 166fddc17deSEric Dumazet const struct in6_addr *saddr, __be16 sport, 16760c04aecSJoe Perches const struct in6_addr *daddr, 16860c04aecSJoe Perches unsigned short hnum, int dif) 169fddc17deSEric Dumazet { 17060c04aecSJoe Perches int score; 17160c04aecSJoe Perches struct inet_sock *inet; 172fddc17deSEric Dumazet 17360c04aecSJoe Perches if (!net_eq(sock_net(sk), net) || 17460c04aecSJoe Perches udp_sk(sk)->udp_port_hash != hnum || 17560c04aecSJoe Perches sk->sk_family != PF_INET6) 17660c04aecSJoe Perches return -1; 177fddc17deSEric Dumazet 178efe4208fSEric Dumazet if (!ipv6_addr_equal(&sk->sk_v6_rcv_saddr, daddr)) 179fddc17deSEric Dumazet return -1; 18060c04aecSJoe Perches 181fddc17deSEric Dumazet score = 0; 18260c04aecSJoe Perches inet = inet_sk(sk); 18360c04aecSJoe Perches 184fddc17deSEric Dumazet if (inet->inet_dport) { 185fddc17deSEric Dumazet if (inet->inet_dport != sport) 186fddc17deSEric Dumazet return -1; 187fddc17deSEric Dumazet score++; 188fddc17deSEric Dumazet } 18960c04aecSJoe Perches 190efe4208fSEric Dumazet if (!ipv6_addr_any(&sk->sk_v6_daddr)) { 191efe4208fSEric Dumazet if (!ipv6_addr_equal(&sk->sk_v6_daddr, saddr)) 192fddc17deSEric Dumazet return -1; 193fddc17deSEric Dumazet score++; 194fddc17deSEric Dumazet } 19560c04aecSJoe Perches 196fddc17deSEric Dumazet if (sk->sk_bound_dev_if) { 197fddc17deSEric Dumazet if (sk->sk_bound_dev_if != dif) 198fddc17deSEric Dumazet return -1; 199fddc17deSEric Dumazet score++; 200fddc17deSEric Dumazet } 20160c04aecSJoe Perches 20270da268bSEric Dumazet if (sk->sk_incoming_cpu == raw_smp_processor_id()) 20370da268bSEric Dumazet score++; 20470da268bSEric Dumazet 205fddc17deSEric Dumazet return score; 206fddc17deSEric Dumazet } 207fddc17deSEric Dumazet 208fddc17deSEric Dumazet /* called with read_rcu_lock() */ 209fddc17deSEric Dumazet static struct sock *udp6_lib_lookup2(struct net *net, 210fddc17deSEric Dumazet const struct in6_addr *saddr, __be16 sport, 211fddc17deSEric Dumazet const struct in6_addr *daddr, unsigned int hnum, int dif, 2121134158bSCraig Gallek struct udp_hslot *hslot2, unsigned int slot2, 2131134158bSCraig Gallek struct sk_buff *skb) 214fddc17deSEric Dumazet { 215fddc17deSEric Dumazet struct sock *sk, *result; 216fddc17deSEric Dumazet struct hlist_nulls_node *node; 21772289b96STom Herbert int score, badness, matches = 0, reuseport = 0; 218ed0dfffdSEric Dumazet bool select_ok = true; 21972289b96STom Herbert u32 hash = 0; 220fddc17deSEric Dumazet 221fddc17deSEric Dumazet begin: 222fddc17deSEric Dumazet result = NULL; 223fddc17deSEric Dumazet badness = -1; 224fddc17deSEric Dumazet udp_portaddr_for_each_entry_rcu(sk, node, &hslot2->head) { 225fddc17deSEric Dumazet score = compute_score2(sk, net, saddr, sport, 226fddc17deSEric Dumazet daddr, hnum, dif); 227fddc17deSEric Dumazet if (score > badness) { 228fddc17deSEric Dumazet result = sk; 229fddc17deSEric Dumazet badness = score; 23072289b96STom Herbert reuseport = sk->sk_reuseport; 23172289b96STom Herbert if (reuseport) { 232b50026b5SHannes Frederic Sowa hash = udp6_ehashfn(net, daddr, hnum, 23372289b96STom Herbert saddr, sport); 234ed0dfffdSEric Dumazet if (select_ok) { 235ed0dfffdSEric Dumazet struct sock *sk2; 236ed0dfffdSEric Dumazet 2371134158bSCraig Gallek sk2 = reuseport_select_sock(sk, hash, skb, 2381134158bSCraig Gallek sizeof(struct udphdr)); 239e32ea7e7SCraig Gallek if (sk2) { 240e32ea7e7SCraig Gallek result = sk2; 241ed0dfffdSEric Dumazet select_ok = false; 242e32ea7e7SCraig Gallek goto found; 243e32ea7e7SCraig Gallek } 244ed0dfffdSEric Dumazet } 24572289b96STom Herbert matches = 1; 24670da268bSEric Dumazet } 24772289b96STom Herbert } else if (score == badness && reuseport) { 24872289b96STom Herbert matches++; 2498fc54f68SDaniel Borkmann if (reciprocal_scale(hash, matches) == 0) 25072289b96STom Herbert result = sk; 25172289b96STom Herbert hash = next_pseudo_random32(hash); 252fddc17deSEric Dumazet } 253fddc17deSEric Dumazet } 254fddc17deSEric Dumazet /* 255fddc17deSEric Dumazet * if the nulls value we got at the end of this lookup is 256fddc17deSEric Dumazet * not the expected one, we must restart lookup. 257fddc17deSEric Dumazet * We probably met an item that was moved to another chain. 258fddc17deSEric Dumazet */ 259fddc17deSEric Dumazet if (get_nulls_value(node) != slot2) 260fddc17deSEric Dumazet goto begin; 261fddc17deSEric Dumazet 262fddc17deSEric Dumazet if (result) { 263e32ea7e7SCraig Gallek found: 264c31504dcSEric Dumazet if (unlikely(!atomic_inc_not_zero_hint(&result->sk_refcnt, 2))) 265fddc17deSEric Dumazet result = NULL; 266fddc17deSEric Dumazet else if (unlikely(compute_score2(result, net, saddr, sport, 267fddc17deSEric Dumazet daddr, hnum, dif) < badness)) { 268fddc17deSEric Dumazet sock_put(result); 269fddc17deSEric Dumazet goto begin; 270fddc17deSEric Dumazet } 271fddc17deSEric Dumazet } 272fddc17deSEric Dumazet return result; 273fddc17deSEric Dumazet } 274fddc17deSEric Dumazet 275fce82338SPavel Emelyanov struct sock *__udp6_lib_lookup(struct net *net, 27688440ae7SBalazs Scheidler const struct in6_addr *saddr, __be16 sport, 27788440ae7SBalazs Scheidler const struct in6_addr *daddr, __be16 dport, 278538950a1SCraig Gallek int dif, struct udp_table *udptable, 279538950a1SCraig Gallek struct sk_buff *skb) 280645ca708SEric Dumazet { 281271b72c7SEric Dumazet struct sock *sk, *result; 28288ab1932SEric Dumazet struct hlist_nulls_node *node; 283645ca708SEric Dumazet unsigned short hnum = ntohs(dport); 284fddc17deSEric Dumazet unsigned int hash2, slot2, slot = udp_hashfn(net, hnum, udptable->mask); 285fddc17deSEric Dumazet struct udp_hslot *hslot2, *hslot = &udptable->hash[slot]; 28672289b96STom Herbert int score, badness, matches = 0, reuseport = 0; 287ed0dfffdSEric Dumazet bool select_ok = true; 28872289b96STom Herbert u32 hash = 0; 289645ca708SEric Dumazet 290271b72c7SEric Dumazet rcu_read_lock(); 291fddc17deSEric Dumazet if (hslot->count > 10) { 292fddc17deSEric Dumazet hash2 = udp6_portaddr_hash(net, daddr, hnum); 293fddc17deSEric Dumazet slot2 = hash2 & udptable->mask; 294fddc17deSEric Dumazet hslot2 = &udptable->hash2[slot2]; 295fddc17deSEric Dumazet if (hslot->count < hslot2->count) 296fddc17deSEric Dumazet goto begin; 297fddc17deSEric Dumazet 298fddc17deSEric Dumazet result = udp6_lib_lookup2(net, saddr, sport, 299fddc17deSEric Dumazet daddr, hnum, dif, 3001134158bSCraig Gallek hslot2, slot2, skb); 301fddc17deSEric Dumazet if (!result) { 302fddc17deSEric Dumazet hash2 = udp6_portaddr_hash(net, &in6addr_any, hnum); 303fddc17deSEric Dumazet slot2 = hash2 & udptable->mask; 304fddc17deSEric Dumazet hslot2 = &udptable->hash2[slot2]; 305fddc17deSEric Dumazet if (hslot->count < hslot2->count) 306fddc17deSEric Dumazet goto begin; 307fddc17deSEric Dumazet 3081223c67cSJorge Boncompte [DTI2] result = udp6_lib_lookup2(net, saddr, sport, 3091223c67cSJorge Boncompte [DTI2] &in6addr_any, hnum, dif, 3101134158bSCraig Gallek hslot2, slot2, skb); 311fddc17deSEric Dumazet } 312fddc17deSEric Dumazet rcu_read_unlock(); 313fddc17deSEric Dumazet return result; 314fddc17deSEric Dumazet } 315271b72c7SEric Dumazet begin: 316271b72c7SEric Dumazet result = NULL; 317271b72c7SEric Dumazet badness = -1; 31888ab1932SEric Dumazet sk_nulls_for_each_rcu(sk, node, &hslot->head) { 319645ca708SEric Dumazet score = compute_score(sk, net, hnum, saddr, sport, daddr, dport, dif); 320645ca708SEric Dumazet if (score > badness) { 321db8dac20SDavid S. Miller result = sk; 322db8dac20SDavid S. Miller badness = score; 32372289b96STom Herbert reuseport = sk->sk_reuseport; 32472289b96STom Herbert if (reuseport) { 325b50026b5SHannes Frederic Sowa hash = udp6_ehashfn(net, daddr, hnum, 32672289b96STom Herbert saddr, sport); 327ed0dfffdSEric Dumazet if (select_ok) { 328ed0dfffdSEric Dumazet struct sock *sk2; 329ed0dfffdSEric Dumazet 330538950a1SCraig Gallek sk2 = reuseport_select_sock(sk, hash, skb, 331538950a1SCraig Gallek sizeof(struct udphdr)); 332e32ea7e7SCraig Gallek if (sk2) { 333e32ea7e7SCraig Gallek result = sk2; 334ed0dfffdSEric Dumazet select_ok = false; 335e32ea7e7SCraig Gallek goto found; 336e32ea7e7SCraig Gallek } 337ed0dfffdSEric Dumazet } 33872289b96STom Herbert matches = 1; 33972289b96STom Herbert } 34072289b96STom Herbert } else if (score == badness && reuseport) { 34172289b96STom Herbert matches++; 3428fc54f68SDaniel Borkmann if (reciprocal_scale(hash, matches) == 0) 34372289b96STom Herbert result = sk; 34472289b96STom Herbert hash = next_pseudo_random32(hash); 345db8dac20SDavid S. Miller } 346db8dac20SDavid S. Miller } 34788ab1932SEric Dumazet /* 34888ab1932SEric Dumazet * if the nulls value we got at the end of this lookup is 34988ab1932SEric Dumazet * not the expected one, we must restart lookup. 35088ab1932SEric Dumazet * We probably met an item that was moved to another chain. 35188ab1932SEric Dumazet */ 352fddc17deSEric Dumazet if (get_nulls_value(node) != slot) 35388ab1932SEric Dumazet goto begin; 35488ab1932SEric Dumazet 355271b72c7SEric Dumazet if (result) { 356e32ea7e7SCraig Gallek found: 357c31504dcSEric Dumazet if (unlikely(!atomic_inc_not_zero_hint(&result->sk_refcnt, 2))) 358271b72c7SEric Dumazet result = NULL; 359271b72c7SEric Dumazet else if (unlikely(compute_score(result, net, hnum, saddr, sport, 360271b72c7SEric Dumazet daddr, dport, dif) < badness)) { 361271b72c7SEric Dumazet sock_put(result); 362271b72c7SEric Dumazet goto begin; 363271b72c7SEric Dumazet } 364271b72c7SEric Dumazet } 365271b72c7SEric Dumazet rcu_read_unlock(); 366db8dac20SDavid S. Miller return result; 367db8dac20SDavid S. Miller } 368fce82338SPavel Emelyanov EXPORT_SYMBOL_GPL(__udp6_lib_lookup); 369db8dac20SDavid S. Miller 370607c4aafSKOVACS Krisztian static struct sock *__udp6_lib_lookup_skb(struct sk_buff *skb, 371607c4aafSKOVACS Krisztian __be16 sport, __be16 dport, 372645ca708SEric Dumazet struct udp_table *udptable) 373607c4aafSKOVACS Krisztian { 37423542618SKOVACS Krisztian struct sock *sk; 375b71d1d42SEric Dumazet const struct ipv6hdr *iph = ipv6_hdr(skb); 376607c4aafSKOVACS Krisztian 377e5d08d71SIan Morris sk = skb_steal_sock(skb); 378e5d08d71SIan Morris if (unlikely(sk)) 37923542618SKOVACS Krisztian return sk; 380adf30907SEric Dumazet return __udp6_lib_lookup(dev_net(skb_dst(skb)->dev), &iph->saddr, sport, 381607c4aafSKOVACS Krisztian &iph->daddr, dport, inet6_iif(skb), 382538950a1SCraig Gallek udptable, skb); 383607c4aafSKOVACS Krisztian } 384607c4aafSKOVACS Krisztian 385aa976fc0SBalazs Scheidler struct sock *udp6_lib_lookup(struct net *net, const struct in6_addr *saddr, __be16 sport, 386aa976fc0SBalazs Scheidler const struct in6_addr *daddr, __be16 dport, int dif) 387aa976fc0SBalazs Scheidler { 388538950a1SCraig Gallek return __udp6_lib_lookup(net, saddr, sport, daddr, dport, dif, &udp_table, NULL); 389aa976fc0SBalazs Scheidler } 390aa976fc0SBalazs Scheidler EXPORT_SYMBOL_GPL(udp6_lib_lookup); 391aa976fc0SBalazs Scheidler 392db8dac20SDavid S. Miller /* 393db8dac20SDavid S. Miller * This should be easy, if there is something there we 394db8dac20SDavid S. Miller * return it, otherwise we block. 395db8dac20SDavid S. Miller */ 396db8dac20SDavid S. Miller 3971b784140SYing Xue int udpv6_recvmsg(struct sock *sk, struct msghdr *msg, size_t len, 398db8dac20SDavid S. Miller int noblock, int flags, int *addr_len) 399db8dac20SDavid S. Miller { 400db8dac20SDavid S. Miller struct ipv6_pinfo *np = inet6_sk(sk); 401db8dac20SDavid S. Miller struct inet_sock *inet = inet_sk(sk); 402db8dac20SDavid S. Miller struct sk_buff *skb; 40359c2cdaeSDavid S. Miller unsigned int ulen, copied; 4043f518bf7SPavel Emelyanov int peeked, off = 0; 405db8dac20SDavid S. Miller int err; 406db8dac20SDavid S. Miller int is_udplite = IS_UDPLITE(sk); 407197c949eSEric Dumazet bool checksum_valid = false; 408f26ba175SWei Yongjun int is_udp4; 4098a74ad60SEric Dumazet bool slow; 410db8dac20SDavid S. Miller 411db8dac20SDavid S. Miller if (flags & MSG_ERRQUEUE) 41285fbaa75SHannes Frederic Sowa return ipv6_recv_error(sk, msg, len, addr_len); 413db8dac20SDavid S. Miller 4144b340ae2SBrian Haley if (np->rxpmtu && np->rxopt.bits.rxpmtu) 41585fbaa75SHannes Frederic Sowa return ipv6_recv_rxpmtu(sk, msg, len, addr_len); 4164b340ae2SBrian Haley 417db8dac20SDavid S. Miller try_again: 418db8dac20SDavid S. Miller skb = __skb_recv_datagram(sk, flags | (noblock ? MSG_DONTWAIT : 0), 4193f518bf7SPavel Emelyanov &peeked, &off, &err); 420db8dac20SDavid S. Miller if (!skb) 421db8dac20SDavid S. Miller goto out; 422db8dac20SDavid S. Miller 423db8dac20SDavid S. Miller ulen = skb->len - sizeof(struct udphdr); 42459c2cdaeSDavid S. Miller copied = len; 42559c2cdaeSDavid S. Miller if (copied > ulen) 42659c2cdaeSDavid S. Miller copied = ulen; 42759c2cdaeSDavid S. Miller else if (copied < ulen) 428db8dac20SDavid S. Miller msg->msg_flags |= MSG_TRUNC; 429db8dac20SDavid S. Miller 430f26ba175SWei Yongjun is_udp4 = (skb->protocol == htons(ETH_P_IP)); 431f26ba175SWei Yongjun 432db8dac20SDavid S. Miller /* 433db8dac20SDavid S. Miller * If checksum is needed at all, try to do it while copying the 434db8dac20SDavid S. Miller * data. If the data is truncated, or if we only want a partial 435db8dac20SDavid S. Miller * coverage checksum (UDP-Lite), do it before the copy. 436db8dac20SDavid S. Miller */ 437db8dac20SDavid S. Miller 43859c2cdaeSDavid S. Miller if (copied < ulen || UDP_SKB_CB(skb)->partial_cov) { 439197c949eSEric Dumazet checksum_valid = !udp_lib_checksum_complete(skb); 440197c949eSEric Dumazet if (!checksum_valid) 441db8dac20SDavid S. Miller goto csum_copy_err; 442db8dac20SDavid S. Miller } 443db8dac20SDavid S. Miller 444197c949eSEric Dumazet if (checksum_valid || skb_csum_unnecessary(skb)) 44551f3d02bSDavid S. Miller err = skb_copy_datagram_msg(skb, sizeof(struct udphdr), 44651f3d02bSDavid S. Miller msg, copied); 447db8dac20SDavid S. Miller else { 448227158dbSAl Viro err = skb_copy_and_csum_datagram_msg(skb, sizeof(struct udphdr), msg); 449db8dac20SDavid S. Miller if (err == -EINVAL) 450db8dac20SDavid S. Miller goto csum_copy_err; 451db8dac20SDavid S. Miller } 45222911fc5SEric Dumazet if (unlikely(err)) { 45322911fc5SEric Dumazet trace_kfree_skb(skb, udpv6_recvmsg); 454979402b1SEric Dumazet if (!peeked) { 455979402b1SEric Dumazet atomic_inc(&sk->sk_drops); 456979402b1SEric Dumazet if (is_udp4) 457979402b1SEric Dumazet UDP_INC_STATS_USER(sock_net(sk), 458979402b1SEric Dumazet UDP_MIB_INERRORS, 459979402b1SEric Dumazet is_udplite); 460979402b1SEric Dumazet else 461979402b1SEric Dumazet UDP6_INC_STATS_USER(sock_net(sk), 462979402b1SEric Dumazet UDP_MIB_INERRORS, 463979402b1SEric Dumazet is_udplite); 464979402b1SEric Dumazet } 465db8dac20SDavid S. Miller goto out_free; 46622911fc5SEric Dumazet } 467f26ba175SWei Yongjun if (!peeked) { 468f26ba175SWei Yongjun if (is_udp4) 469f26ba175SWei Yongjun UDP_INC_STATS_USER(sock_net(sk), 470f26ba175SWei Yongjun UDP_MIB_INDATAGRAMS, is_udplite); 471f26ba175SWei Yongjun else 472235b9f7aSPavel Emelyanov UDP6_INC_STATS_USER(sock_net(sk), 473235b9f7aSPavel Emelyanov UDP_MIB_INDATAGRAMS, is_udplite); 474f26ba175SWei Yongjun } 475db8dac20SDavid S. Miller 4763b885787SNeil Horman sock_recv_ts_and_drops(msg, sk, skb); 477db8dac20SDavid S. Miller 478db8dac20SDavid S. Miller /* Copy the address. */ 479db8dac20SDavid S. Miller if (msg->msg_name) { 480342dfc30SSteffen Hurrle DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, msg->msg_name); 481db8dac20SDavid S. Miller sin6->sin6_family = AF_INET6; 482db8dac20SDavid S. Miller sin6->sin6_port = udp_hdr(skb)->source; 483db8dac20SDavid S. Miller sin6->sin6_flowinfo = 0; 484db8dac20SDavid S. Miller 485842df073SHannes Frederic Sowa if (is_udp4) { 486b301e82cSBrian Haley ipv6_addr_set_v4mapped(ip_hdr(skb)->saddr, 487b301e82cSBrian Haley &sin6->sin6_addr); 488842df073SHannes Frederic Sowa sin6->sin6_scope_id = 0; 489842df073SHannes Frederic Sowa } else { 4904e3fd7a0SAlexey Dobriyan sin6->sin6_addr = ipv6_hdr(skb)->saddr; 491842df073SHannes Frederic Sowa sin6->sin6_scope_id = 492842df073SHannes Frederic Sowa ipv6_iface_scope_id(&sin6->sin6_addr, 4934330487aSDuan Jiong inet6_iif(skb)); 494db8dac20SDavid S. Miller } 495bceaa902SHannes Frederic Sowa *addr_len = sizeof(*sin6); 496db8dac20SDavid S. Miller } 4974b261c75SHannes Frederic Sowa 4984b261c75SHannes Frederic Sowa if (np->rxopt.all) 4994b261c75SHannes Frederic Sowa ip6_datagram_recv_common_ctl(sk, msg, skb); 5004b261c75SHannes Frederic Sowa 501f26ba175SWei Yongjun if (is_udp4) { 502db8dac20SDavid S. Miller if (inet->cmsg_flags) 503db8dac20SDavid S. Miller ip_cmsg_recv(msg, skb); 504db8dac20SDavid S. Miller } else { 505db8dac20SDavid S. Miller if (np->rxopt.all) 5064b261c75SHannes Frederic Sowa ip6_datagram_recv_specific_ctl(sk, msg, skb); 507db8dac20SDavid S. Miller } 508db8dac20SDavid S. Miller 50959c2cdaeSDavid S. Miller err = copied; 510db8dac20SDavid S. Miller if (flags & MSG_TRUNC) 511db8dac20SDavid S. Miller err = ulen; 512db8dac20SDavid S. Miller 513db8dac20SDavid S. Miller out_free: 5149d410c79SEric Dumazet skb_free_datagram_locked(sk, skb); 515db8dac20SDavid S. Miller out: 516db8dac20SDavid S. Miller return err; 517db8dac20SDavid S. Miller 518db8dac20SDavid S. Miller csum_copy_err: 5198a74ad60SEric Dumazet slow = lock_sock_fast(sk); 5200856f939SWei Yongjun if (!skb_kill_datagram(sk, skb, flags)) { 5216a5dc9e5SEric Dumazet if (is_udp4) { 5226a5dc9e5SEric Dumazet UDP_INC_STATS_USER(sock_net(sk), 5236a5dc9e5SEric Dumazet UDP_MIB_CSUMERRORS, is_udplite); 5240856f939SWei Yongjun UDP_INC_STATS_USER(sock_net(sk), 5250856f939SWei Yongjun UDP_MIB_INERRORS, is_udplite); 5266a5dc9e5SEric Dumazet } else { 5276a5dc9e5SEric Dumazet UDP6_INC_STATS_USER(sock_net(sk), 5286a5dc9e5SEric Dumazet UDP_MIB_CSUMERRORS, is_udplite); 5290856f939SWei Yongjun UDP6_INC_STATS_USER(sock_net(sk), 5300856f939SWei Yongjun UDP_MIB_INERRORS, is_udplite); 5310856f939SWei Yongjun } 5326a5dc9e5SEric Dumazet } 5338a74ad60SEric Dumazet unlock_sock_fast(sk, slow); 534db8dac20SDavid S. Miller 535beb39db5SEric Dumazet /* starting over for a new packet, but check if we need to yield */ 536beb39db5SEric Dumazet cond_resched(); 5379cfaa8deSXufeng Zhang msg->msg_flags &= ~MSG_TRUNC; 538db8dac20SDavid S. Miller goto try_again; 539db8dac20SDavid S. Miller } 540db8dac20SDavid S. Miller 541db8dac20SDavid S. Miller void __udp6_lib_err(struct sk_buff *skb, struct inet6_skb_parm *opt, 542d5fdd6baSBrian Haley u8 type, u8 code, int offset, __be32 info, 543645ca708SEric Dumazet struct udp_table *udptable) 544db8dac20SDavid S. Miller { 545db8dac20SDavid S. Miller struct ipv6_pinfo *np; 546b71d1d42SEric Dumazet const struct ipv6hdr *hdr = (const struct ipv6hdr *)skb->data; 547b71d1d42SEric Dumazet const struct in6_addr *saddr = &hdr->saddr; 548b71d1d42SEric Dumazet const struct in6_addr *daddr = &hdr->daddr; 549db8dac20SDavid S. Miller struct udphdr *uh = (struct udphdr *)(skb->data+offset); 550db8dac20SDavid S. Miller struct sock *sk; 551e0d8c1b7SWei Wang int harderr; 552db8dac20SDavid S. Miller int err; 5537304fe46SDuan Jiong struct net *net = dev_net(skb->dev); 554db8dac20SDavid S. Miller 555e32ea7e7SCraig Gallek sk = __udp6_lib_lookup(net, daddr, uh->dest, saddr, uh->source, 556538950a1SCraig Gallek inet6_iif(skb), udptable, skb); 55763159f29SIan Morris if (!sk) { 5587304fe46SDuan Jiong ICMP6_INC_STATS_BH(net, __in6_dev_get(skb->dev), 5597304fe46SDuan Jiong ICMP6_MIB_INERRORS); 560db8dac20SDavid S. Miller return; 5617304fe46SDuan Jiong } 562db8dac20SDavid S. Miller 563e0d8c1b7SWei Wang harderr = icmpv6_err_convert(type, code, &err); 564e0d8c1b7SWei Wang np = inet6_sk(sk); 565e0d8c1b7SWei Wang 56693b36cf3SHannes Frederic Sowa if (type == ICMPV6_PKT_TOOBIG) { 56793b36cf3SHannes Frederic Sowa if (!ip6_sk_accept_pmtu(sk)) 56893b36cf3SHannes Frederic Sowa goto out; 56981aded24SDavid S. Miller ip6_sk_update_pmtu(skb, sk, info); 570e0d8c1b7SWei Wang if (np->pmtudisc != IPV6_PMTUDISC_DONT) 571e0d8c1b7SWei Wang harderr = 1; 57293b36cf3SHannes Frederic Sowa } 5731a462d18SDuan Jiong if (type == NDISC_REDIRECT) { 574ec18d9a2SDavid S. Miller ip6_sk_redirect(skb, sk); 5751a462d18SDuan Jiong goto out; 5761a462d18SDuan Jiong } 57781aded24SDavid S. Miller 578e0d8c1b7SWei Wang if (!np->recverr) { 579e0d8c1b7SWei Wang if (!harderr || sk->sk_state != TCP_ESTABLISHED) 580db8dac20SDavid S. Miller goto out; 581e0d8c1b7SWei Wang } else { 582db8dac20SDavid S. Miller ipv6_icmp_error(sk, skb, err, uh->dest, ntohl(info), (u8 *)(uh+1)); 583e0d8c1b7SWei Wang } 584b1faf566SEric Dumazet 585db8dac20SDavid S. Miller sk->sk_err = err; 586db8dac20SDavid S. Miller sk->sk_error_report(sk); 587db8dac20SDavid S. Miller out: 588db8dac20SDavid S. Miller sock_put(sk); 589db8dac20SDavid S. Miller } 590db8dac20SDavid S. Miller 591f7ad74feSBenjamin LaHaise static int __udpv6_queue_rcv_skb(struct sock *sk, struct sk_buff *skb) 592f7ad74feSBenjamin LaHaise { 593f7ad74feSBenjamin LaHaise int rc; 594f7ad74feSBenjamin LaHaise 595efe4208fSEric Dumazet if (!ipv6_addr_any(&sk->sk_v6_daddr)) { 596f7ad74feSBenjamin LaHaise sock_rps_save_rxhash(sk, skb); 597005ec974SShawn Bohrer sk_mark_napi_id(sk, skb); 5982c8c56e1SEric Dumazet sk_incoming_cpu_update(sk); 599005ec974SShawn Bohrer } 600f7ad74feSBenjamin LaHaise 601f7ad74feSBenjamin LaHaise rc = sock_queue_rcv_skb(sk, skb); 602f7ad74feSBenjamin LaHaise if (rc < 0) { 603f7ad74feSBenjamin LaHaise int is_udplite = IS_UDPLITE(sk); 604f7ad74feSBenjamin LaHaise 605f7ad74feSBenjamin LaHaise /* Note that an ENOMEM error is charged twice */ 606f7ad74feSBenjamin LaHaise if (rc == -ENOMEM) 607f7ad74feSBenjamin LaHaise UDP6_INC_STATS_BH(sock_net(sk), 608f7ad74feSBenjamin LaHaise UDP_MIB_RCVBUFERRORS, is_udplite); 609f7ad74feSBenjamin LaHaise UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_INERRORS, is_udplite); 610f7ad74feSBenjamin LaHaise kfree_skb(skb); 611f7ad74feSBenjamin LaHaise return -1; 612f7ad74feSBenjamin LaHaise } 613f7ad74feSBenjamin LaHaise return 0; 614f7ad74feSBenjamin LaHaise } 615f7ad74feSBenjamin LaHaise 616db8dac20SDavid S. Miller static __inline__ void udpv6_err(struct sk_buff *skb, 617d5fdd6baSBrian Haley struct inet6_skb_parm *opt, u8 type, 618d5fdd6baSBrian Haley u8 code, int offset, __be32 info) 619db8dac20SDavid S. Miller { 620645ca708SEric Dumazet __udp6_lib_err(skb, opt, type, code, offset, info, &udp_table); 621db8dac20SDavid S. Miller } 622db8dac20SDavid S. Miller 623d7f3f621SBenjamin LaHaise static struct static_key udpv6_encap_needed __read_mostly; 624d7f3f621SBenjamin LaHaise void udpv6_encap_enable(void) 625d7f3f621SBenjamin LaHaise { 626d7f3f621SBenjamin LaHaise if (!static_key_enabled(&udpv6_encap_needed)) 627d7f3f621SBenjamin LaHaise static_key_slow_inc(&udpv6_encap_needed); 628d7f3f621SBenjamin LaHaise } 629d7f3f621SBenjamin LaHaise EXPORT_SYMBOL(udpv6_encap_enable); 630d7f3f621SBenjamin LaHaise 631db8dac20SDavid S. Miller int udpv6_queue_rcv_skb(struct sock *sk, struct sk_buff *skb) 632db8dac20SDavid S. Miller { 633db8dac20SDavid S. Miller struct udp_sock *up = udp_sk(sk); 634db8dac20SDavid S. Miller int rc; 635db8dac20SDavid S. Miller int is_udplite = IS_UDPLITE(sk); 636db8dac20SDavid S. Miller 637db8dac20SDavid S. Miller if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb)) 638db8dac20SDavid S. Miller goto drop; 639db8dac20SDavid S. Miller 640d7f3f621SBenjamin LaHaise if (static_key_false(&udpv6_encap_needed) && up->encap_type) { 641d7f3f621SBenjamin LaHaise int (*encap_rcv)(struct sock *sk, struct sk_buff *skb); 642d7f3f621SBenjamin LaHaise 643d7f3f621SBenjamin LaHaise /* 644d7f3f621SBenjamin LaHaise * This is an encapsulation socket so pass the skb to 645d7f3f621SBenjamin LaHaise * the socket's udp_encap_rcv() hook. Otherwise, just 646d7f3f621SBenjamin LaHaise * fall through and pass this up the UDP socket. 647d7f3f621SBenjamin LaHaise * up->encap_rcv() returns the following value: 648d7f3f621SBenjamin LaHaise * =0 if skb was successfully passed to the encap 649d7f3f621SBenjamin LaHaise * handler or was discarded by it. 650d7f3f621SBenjamin LaHaise * >0 if skb should be passed on to UDP. 651d7f3f621SBenjamin LaHaise * <0 if skb should be resubmitted as proto -N 652d7f3f621SBenjamin LaHaise */ 653d7f3f621SBenjamin LaHaise 654d7f3f621SBenjamin LaHaise /* if we're overly short, let UDP handle it */ 655d7f3f621SBenjamin LaHaise encap_rcv = ACCESS_ONCE(up->encap_rcv); 65653b24b8fSIan Morris if (skb->len > sizeof(struct udphdr) && encap_rcv) { 657d7f3f621SBenjamin LaHaise int ret; 658d7f3f621SBenjamin LaHaise 6590a80966bSTom Herbert /* Verify checksum before giving to encap */ 6600a80966bSTom Herbert if (udp_lib_checksum_complete(skb)) 6610a80966bSTom Herbert goto csum_error; 6620a80966bSTom Herbert 663d7f3f621SBenjamin LaHaise ret = encap_rcv(sk, skb); 664d7f3f621SBenjamin LaHaise if (ret <= 0) { 665d7f3f621SBenjamin LaHaise UDP_INC_STATS_BH(sock_net(sk), 666d7f3f621SBenjamin LaHaise UDP_MIB_INDATAGRAMS, 667d7f3f621SBenjamin LaHaise is_udplite); 668d7f3f621SBenjamin LaHaise return -ret; 669d7f3f621SBenjamin LaHaise } 670d7f3f621SBenjamin LaHaise } 671d7f3f621SBenjamin LaHaise 672d7f3f621SBenjamin LaHaise /* FALLTHROUGH -- it's a UDP Packet */ 673d7f3f621SBenjamin LaHaise } 674d7f3f621SBenjamin LaHaise 675db8dac20SDavid S. Miller /* 676db8dac20SDavid S. Miller * UDP-Lite specific tests, ignored on UDP sockets (see net/ipv4/udp.c). 677db8dac20SDavid S. Miller */ 678db8dac20SDavid S. Miller if ((is_udplite & UDPLITE_RECV_CC) && UDP_SKB_CB(skb)->partial_cov) { 679db8dac20SDavid S. Miller 680db8dac20SDavid S. Miller if (up->pcrlen == 0) { /* full coverage was set */ 681ba7a46f1SJoe Perches net_dbg_ratelimited("UDPLITE6: partial coverage %d while full coverage %d requested\n", 682db8dac20SDavid S. Miller UDP_SKB_CB(skb)->cscov, skb->len); 683db8dac20SDavid S. Miller goto drop; 684db8dac20SDavid S. Miller } 685db8dac20SDavid S. Miller if (UDP_SKB_CB(skb)->cscov < up->pcrlen) { 686ba7a46f1SJoe Perches net_dbg_ratelimited("UDPLITE6: coverage %d too small, need min %d\n", 687db8dac20SDavid S. Miller UDP_SKB_CB(skb)->cscov, up->pcrlen); 688db8dac20SDavid S. Miller goto drop; 689db8dac20SDavid S. Miller } 690db8dac20SDavid S. Miller } 691db8dac20SDavid S. Miller 69233d480ceSEric Dumazet if (rcu_access_pointer(sk->sk_filter)) { 693db8dac20SDavid S. Miller if (udp_lib_checksum_complete(skb)) 6946a5dc9e5SEric Dumazet goto csum_error; 695db8dac20SDavid S. Miller } 696db8dac20SDavid S. Miller 697274f482dSSorin Dumitru if (sk_rcvqueues_full(sk, sk->sk_rcvbuf)) { 6983e215c8dSJames M Leddy UDP6_INC_STATS_BH(sock_net(sk), 6993e215c8dSJames M Leddy UDP_MIB_RCVBUFERRORS, is_udplite); 700cb80ef46SBenjamin LaHaise goto drop; 7013e215c8dSJames M Leddy } 702cb80ef46SBenjamin LaHaise 703d826eb14SEric Dumazet skb_dst_drop(skb); 704db8dac20SDavid S. Miller 705cb80ef46SBenjamin LaHaise bh_lock_sock(sk); 706cb80ef46SBenjamin LaHaise rc = 0; 707cb80ef46SBenjamin LaHaise if (!sock_owned_by_user(sk)) 708f7ad74feSBenjamin LaHaise rc = __udpv6_queue_rcv_skb(sk, skb); 709cb80ef46SBenjamin LaHaise else if (sk_add_backlog(sk, skb, sk->sk_rcvbuf)) { 710cb80ef46SBenjamin LaHaise bh_unlock_sock(sk); 711cb80ef46SBenjamin LaHaise goto drop; 712cb80ef46SBenjamin LaHaise } 713cb80ef46SBenjamin LaHaise bh_unlock_sock(sk); 714f7ad74feSBenjamin LaHaise 715f7ad74feSBenjamin LaHaise return rc; 7163e215c8dSJames M Leddy 7176a5dc9e5SEric Dumazet csum_error: 7186a5dc9e5SEric Dumazet UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_CSUMERRORS, is_udplite); 719db8dac20SDavid S. Miller drop: 720ef28d1a2SPavel Emelyanov UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_INERRORS, is_udplite); 721cb80ef46SBenjamin LaHaise atomic_inc(&sk->sk_drops); 722db8dac20SDavid S. Miller kfree_skb(skb); 723db8dac20SDavid S. Miller return -1; 724db8dac20SDavid S. Miller } 725db8dac20SDavid S. Miller 7265cf3d461SDavid Held static bool __udp_v6_is_mcast_sock(struct net *net, struct sock *sk, 727b71d1d42SEric Dumazet __be16 loc_port, const struct in6_addr *loc_addr, 728b71d1d42SEric Dumazet __be16 rmt_port, const struct in6_addr *rmt_addr, 7295cf3d461SDavid Held int dif, unsigned short hnum) 730db8dac20SDavid S. Miller { 7319e89fd8bSSven Wegener struct inet_sock *inet = inet_sk(sk); 732db8dac20SDavid S. Miller 7339e89fd8bSSven Wegener if (!net_eq(sock_net(sk), net)) 7345cf3d461SDavid Held return false; 735b8ad0cbcSDaniel Lezcano 7365cf3d461SDavid Held if (udp_sk(sk)->udp_port_hash != hnum || 7375cf3d461SDavid Held sk->sk_family != PF_INET6 || 7385cf3d461SDavid Held (inet->inet_dport && inet->inet_dport != rmt_port) || 7395cf3d461SDavid Held (!ipv6_addr_any(&sk->sk_v6_daddr) && 7405cf3d461SDavid Held !ipv6_addr_equal(&sk->sk_v6_daddr, rmt_addr)) || 74133b4b015SHenning Rogge (sk->sk_bound_dev_if && sk->sk_bound_dev_if != dif) || 74233b4b015SHenning Rogge (!ipv6_addr_any(&sk->sk_v6_rcv_saddr) && 74333b4b015SHenning Rogge !ipv6_addr_equal(&sk->sk_v6_rcv_saddr, loc_addr))) 7445cf3d461SDavid Held return false; 7459e89fd8bSSven Wegener if (!inet6_mc_check(sk, loc_addr, rmt_addr)) 7465cf3d461SDavid Held return false; 7475cf3d461SDavid Held return true; 748db8dac20SDavid S. Miller } 749db8dac20SDavid S. Miller 750a1ab77f9SEric Dumazet static void flush_stack(struct sock **stack, unsigned int count, 751a1ab77f9SEric Dumazet struct sk_buff *skb, unsigned int final) 752a1ab77f9SEric Dumazet { 753cb80ef46SBenjamin LaHaise struct sk_buff *skb1 = NULL; 754a1ab77f9SEric Dumazet struct sock *sk; 755cb80ef46SBenjamin LaHaise unsigned int i; 756a1ab77f9SEric Dumazet 757a1ab77f9SEric Dumazet for (i = 0; i < count; i++) { 758a1ab77f9SEric Dumazet sk = stack[i]; 75963159f29SIan Morris if (likely(!skb1)) 760cb80ef46SBenjamin LaHaise skb1 = (i == final) ? skb : skb_clone(skb, GFP_ATOMIC); 761cb80ef46SBenjamin LaHaise if (!skb1) { 762f6b8f32cSEric Dumazet atomic_inc(&sk->sk_drops); 763cb80ef46SBenjamin LaHaise UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_RCVBUFERRORS, 764cb80ef46SBenjamin LaHaise IS_UDPLITE(sk)); 765cb80ef46SBenjamin LaHaise UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_INERRORS, 766cb80ef46SBenjamin LaHaise IS_UDPLITE(sk)); 767a1ab77f9SEric Dumazet } 768cb80ef46SBenjamin LaHaise 769cb80ef46SBenjamin LaHaise if (skb1 && udpv6_queue_rcv_skb(sk, skb1) <= 0) 770cb80ef46SBenjamin LaHaise skb1 = NULL; 7712dc41cffSDavid Held sock_put(sk); 772cb80ef46SBenjamin LaHaise } 773cb80ef46SBenjamin LaHaise if (unlikely(skb1)) 774cb80ef46SBenjamin LaHaise kfree_skb(skb1); 775a1ab77f9SEric Dumazet } 7764068579eSTom Herbert 7774068579eSTom Herbert static void udp6_csum_zero_error(struct sk_buff *skb) 7784068579eSTom Herbert { 7794068579eSTom Herbert /* RFC 2460 section 8.1 says that we SHOULD log 7804068579eSTom Herbert * this error. Well, it is reasonable. 7814068579eSTom Herbert */ 782ba7a46f1SJoe Perches net_dbg_ratelimited("IPv6: udp checksum is 0 for [%pI6c]:%u->[%pI6c]:%u\n", 7834068579eSTom Herbert &ipv6_hdr(skb)->saddr, ntohs(udp_hdr(skb)->source), 7844068579eSTom Herbert &ipv6_hdr(skb)->daddr, ntohs(udp_hdr(skb)->dest)); 7854068579eSTom Herbert } 7864068579eSTom Herbert 787db8dac20SDavid S. Miller /* 788db8dac20SDavid S. Miller * Note: called only from the BH handler context, 789db8dac20SDavid S. Miller * so we don't need to lock the hashes. 790db8dac20SDavid S. Miller */ 791e3163493SPavel Emelyanov static int __udp6_lib_mcast_deliver(struct net *net, struct sk_buff *skb, 792b71d1d42SEric Dumazet const struct in6_addr *saddr, const struct in6_addr *daddr, 79336cbb245SRick Jones struct udp_table *udptable, int proto) 794db8dac20SDavid S. Miller { 795a1ab77f9SEric Dumazet struct sock *sk, *stack[256 / sizeof(struct sock *)]; 796db8dac20SDavid S. Miller const struct udphdr *uh = udp_hdr(skb); 7975cf3d461SDavid Held struct hlist_nulls_node *node; 7985cf3d461SDavid Held unsigned short hnum = ntohs(uh->dest); 7995cf3d461SDavid Held struct udp_hslot *hslot = udp_hashslot(udptable, net, hnum); 8005cf3d461SDavid Held int dif = inet6_iif(skb); 8012dc41cffSDavid Held unsigned int count = 0, offset = offsetof(typeof(*sk), sk_nulls_node); 8022dc41cffSDavid Held unsigned int hash2 = 0, hash2_any = 0, use_hash2 = (hslot->count > 10); 80336cbb245SRick Jones bool inner_flushed = false; 8042dc41cffSDavid Held 8052dc41cffSDavid Held if (use_hash2) { 8062dc41cffSDavid Held hash2_any = udp6_portaddr_hash(net, &in6addr_any, hnum) & 8072dc41cffSDavid Held udp_table.mask; 8082dc41cffSDavid Held hash2 = udp6_portaddr_hash(net, daddr, hnum) & udp_table.mask; 8092dc41cffSDavid Held start_lookup: 8102dc41cffSDavid Held hslot = &udp_table.hash2[hash2]; 8112dc41cffSDavid Held offset = offsetof(typeof(*sk), __sk_common.skc_portaddr_node); 8122dc41cffSDavid Held } 813db8dac20SDavid S. Miller 814645ca708SEric Dumazet spin_lock(&hslot->lock); 8152dc41cffSDavid Held sk_nulls_for_each_entry_offset(sk, node, &hslot->head, offset) { 8165cf3d461SDavid Held if (__udp_v6_is_mcast_sock(net, sk, 8175cf3d461SDavid Held uh->dest, daddr, 8185cf3d461SDavid Held uh->source, saddr, 8195cf3d461SDavid Held dif, hnum) && 8201c19448cSTom Herbert /* If zero checksum and no_check is not on for 8214068579eSTom Herbert * the socket then skip it. 8224068579eSTom Herbert */ 8235cf3d461SDavid Held (uh->check || udp_sk(sk)->no_check6_rx)) { 824a1ab77f9SEric Dumazet if (unlikely(count == ARRAY_SIZE(stack))) { 825a1ab77f9SEric Dumazet flush_stack(stack, count, skb, ~0); 82636cbb245SRick Jones inner_flushed = true; 827a1ab77f9SEric Dumazet count = 0; 828db8dac20SDavid S. Miller } 8295cf3d461SDavid Held stack[count++] = sk; 8302dc41cffSDavid Held sock_hold(sk); 8315cf3d461SDavid Held } 832a1ab77f9SEric Dumazet } 833db8dac20SDavid S. Miller 834645ca708SEric Dumazet spin_unlock(&hslot->lock); 835a1ab77f9SEric Dumazet 8362dc41cffSDavid Held /* Also lookup *:port if we are using hash2 and haven't done so yet. */ 8372dc41cffSDavid Held if (use_hash2 && hash2 != hash2_any) { 8382dc41cffSDavid Held hash2 = hash2_any; 8392dc41cffSDavid Held goto start_lookup; 8402dc41cffSDavid Held } 8412dc41cffSDavid Held 842a1ab77f9SEric Dumazet if (count) { 843a1ab77f9SEric Dumazet flush_stack(stack, count, skb, count - 1); 844a1ab77f9SEric Dumazet } else { 84536cbb245SRick Jones if (!inner_flushed) 84636cbb245SRick Jones UDP_INC_STATS_BH(net, UDP_MIB_IGNOREDMULTI, 84736cbb245SRick Jones proto == IPPROTO_UDPLITE); 84836cbb245SRick Jones consume_skb(skb); 849a1ab77f9SEric Dumazet } 850db8dac20SDavid S. Miller return 0; 851db8dac20SDavid S. Miller } 852db8dac20SDavid S. Miller 853645ca708SEric Dumazet int __udp6_lib_rcv(struct sk_buff *skb, struct udp_table *udptable, 854db8dac20SDavid S. Miller int proto) 855db8dac20SDavid S. Miller { 8563ffe533cSAlexey Dobriyan struct net *net = dev_net(skb->dev); 857db8dac20SDavid S. Miller struct sock *sk; 858db8dac20SDavid S. Miller struct udphdr *uh; 859b71d1d42SEric Dumazet const struct in6_addr *saddr, *daddr; 860db8dac20SDavid S. Miller u32 ulen = 0; 861db8dac20SDavid S. Miller 862db8dac20SDavid S. Miller if (!pskb_may_pull(skb, sizeof(struct udphdr))) 863d6bc0149SBjørn Mork goto discard; 864db8dac20SDavid S. Miller 865db8dac20SDavid S. Miller saddr = &ipv6_hdr(skb)->saddr; 866db8dac20SDavid S. Miller daddr = &ipv6_hdr(skb)->daddr; 867db8dac20SDavid S. Miller uh = udp_hdr(skb); 868db8dac20SDavid S. Miller 869db8dac20SDavid S. Miller ulen = ntohs(uh->len); 870db8dac20SDavid S. Miller if (ulen > skb->len) 871db8dac20SDavid S. Miller goto short_packet; 872db8dac20SDavid S. Miller 873db8dac20SDavid S. Miller if (proto == IPPROTO_UDP) { 874db8dac20SDavid S. Miller /* UDP validates ulen. */ 875db8dac20SDavid S. Miller 876db8dac20SDavid S. Miller /* Check for jumbo payload */ 877db8dac20SDavid S. Miller if (ulen == 0) 878db8dac20SDavid S. Miller ulen = skb->len; 879db8dac20SDavid S. Miller 880db8dac20SDavid S. Miller if (ulen < sizeof(*uh)) 881db8dac20SDavid S. Miller goto short_packet; 882db8dac20SDavid S. Miller 883db8dac20SDavid S. Miller if (ulen < skb->len) { 884db8dac20SDavid S. Miller if (pskb_trim_rcsum(skb, ulen)) 885db8dac20SDavid S. Miller goto short_packet; 886db8dac20SDavid S. Miller saddr = &ipv6_hdr(skb)->saddr; 887db8dac20SDavid S. Miller daddr = &ipv6_hdr(skb)->daddr; 888db8dac20SDavid S. Miller uh = udp_hdr(skb); 889db8dac20SDavid S. Miller } 890db8dac20SDavid S. Miller } 891db8dac20SDavid S. Miller 892db8dac20SDavid S. Miller if (udp6_csum_init(skb, uh, proto)) 8936a5dc9e5SEric Dumazet goto csum_error; 894db8dac20SDavid S. Miller 895db8dac20SDavid S. Miller /* 896db8dac20SDavid S. Miller * Multicast receive code 897db8dac20SDavid S. Miller */ 898db8dac20SDavid S. Miller if (ipv6_addr_is_multicast(daddr)) 899e3163493SPavel Emelyanov return __udp6_lib_mcast_deliver(net, skb, 90036cbb245SRick Jones saddr, daddr, udptable, proto); 901db8dac20SDavid S. Miller 902db8dac20SDavid S. Miller /* Unicast */ 903db8dac20SDavid S. Miller 904db8dac20SDavid S. Miller /* 905db8dac20SDavid S. Miller * check socket cache ... must talk to Alan about his plans 906db8dac20SDavid S. Miller * for sock caches... i'll skip this for now. 907db8dac20SDavid S. Miller */ 908607c4aafSKOVACS Krisztian sk = __udp6_lib_lookup_skb(skb, uh->source, uh->dest, udptable); 90953b24b8fSIan Morris if (sk) { 910a5b50476SEliezer Tamir int ret; 911a5b50476SEliezer Tamir 9121c19448cSTom Herbert if (!uh->check && !udp_sk(sk)->no_check6_rx) { 91379e0f1c9STom Herbert sock_put(sk); 9144068579eSTom Herbert udp6_csum_zero_error(skb); 9154068579eSTom Herbert goto csum_error; 9164068579eSTom Herbert } 9174068579eSTom Herbert 918224d019cSTom Herbert if (inet_get_convert_csum(sk) && uh->check && !IS_UDPLITE(sk)) 9192abb7cdcSTom Herbert skb_checksum_try_convert(skb, IPPROTO_UDP, uh->check, 9202abb7cdcSTom Herbert ip6_compute_pseudo); 9212abb7cdcSTom Herbert 922a5b50476SEliezer Tamir ret = udpv6_queue_rcv_skb(sk, skb); 923cb80ef46SBenjamin LaHaise sock_put(sk); 924db8dac20SDavid S. Miller 925cb80ef46SBenjamin LaHaise /* a return value > 0 means to resubmit the input, but 926cb80ef46SBenjamin LaHaise * it wants the return to be -protocol, or 0 927cb80ef46SBenjamin LaHaise */ 928cb80ef46SBenjamin LaHaise if (ret > 0) 929cb80ef46SBenjamin LaHaise return -ret; 930cb80ef46SBenjamin LaHaise 931cb80ef46SBenjamin LaHaise return 0; 932cb80ef46SBenjamin LaHaise } 933cb80ef46SBenjamin LaHaise 9344068579eSTom Herbert if (!uh->check) { 9354068579eSTom Herbert udp6_csum_zero_error(skb); 9364068579eSTom Herbert goto csum_error; 9374068579eSTom Herbert } 9384068579eSTom Herbert 939db8dac20SDavid S. Miller if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) 940db8dac20SDavid S. Miller goto discard; 941db8dac20SDavid S. Miller 942db8dac20SDavid S. Miller if (udp_lib_checksum_complete(skb)) 9436a5dc9e5SEric Dumazet goto csum_error; 944db8dac20SDavid S. Miller 945cb80ef46SBenjamin LaHaise UDP6_INC_STATS_BH(net, UDP_MIB_NOPORTS, proto == IPPROTO_UDPLITE); 9463ffe533cSAlexey Dobriyan icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0); 947db8dac20SDavid S. Miller 948db8dac20SDavid S. Miller kfree_skb(skb); 949db8dac20SDavid S. Miller return 0; 950db8dac20SDavid S. Miller 951db8dac20SDavid S. Miller short_packet: 952ba7a46f1SJoe Perches net_dbg_ratelimited("UDP%sv6: short packet: From [%pI6c]:%u %d/%d to [%pI6c]:%u\n", 953db8dac20SDavid S. Miller proto == IPPROTO_UDPLITE ? "-Lite" : "", 954ba7a46f1SJoe Perches saddr, ntohs(uh->source), 955ba7a46f1SJoe Perches ulen, skb->len, 956ba7a46f1SJoe Perches daddr, ntohs(uh->dest)); 9576a5dc9e5SEric Dumazet goto discard; 9586a5dc9e5SEric Dumazet csum_error: 9596a5dc9e5SEric Dumazet UDP6_INC_STATS_BH(net, UDP_MIB_CSUMERRORS, proto == IPPROTO_UDPLITE); 960db8dac20SDavid S. Miller discard: 961ef28d1a2SPavel Emelyanov UDP6_INC_STATS_BH(net, UDP_MIB_INERRORS, proto == IPPROTO_UDPLITE); 962db8dac20SDavid S. Miller kfree_skb(skb); 963db8dac20SDavid S. Miller return 0; 964db8dac20SDavid S. Miller } 965db8dac20SDavid S. Miller 966db8dac20SDavid S. Miller static __inline__ int udpv6_rcv(struct sk_buff *skb) 967db8dac20SDavid S. Miller { 968645ca708SEric Dumazet return __udp6_lib_rcv(skb, &udp_table, IPPROTO_UDP); 969db8dac20SDavid S. Miller } 970db8dac20SDavid S. Miller 971db8dac20SDavid S. Miller /* 972db8dac20SDavid S. Miller * Throw away all pending data and cancel the corking. Socket is locked. 973db8dac20SDavid S. Miller */ 974db8dac20SDavid S. Miller static void udp_v6_flush_pending_frames(struct sock *sk) 975db8dac20SDavid S. Miller { 976db8dac20SDavid S. Miller struct udp_sock *up = udp_sk(sk); 977db8dac20SDavid S. Miller 97836d926b9SDenis V. Lunev if (up->pending == AF_INET) 97936d926b9SDenis V. Lunev udp_flush_pending_frames(sk); 98036d926b9SDenis V. Lunev else if (up->pending) { 981db8dac20SDavid S. Miller up->len = 0; 982db8dac20SDavid S. Miller up->pending = 0; 983db8dac20SDavid S. Miller ip6_flush_pending_frames(sk); 984db8dac20SDavid S. Miller } 985db8dac20SDavid S. Miller } 986db8dac20SDavid S. Miller 987493c6be3SSridhar Samudrala /** 988493c6be3SSridhar Samudrala * udp6_hwcsum_outgoing - handle outgoing HW checksumming 989493c6be3SSridhar Samudrala * @sk: socket we are sending on 990493c6be3SSridhar Samudrala * @skb: sk_buff containing the filled-in UDP header 991493c6be3SSridhar Samudrala * (checksum field must be zeroed out) 992493c6be3SSridhar Samudrala */ 993493c6be3SSridhar Samudrala static void udp6_hwcsum_outgoing(struct sock *sk, struct sk_buff *skb, 994493c6be3SSridhar Samudrala const struct in6_addr *saddr, 995493c6be3SSridhar Samudrala const struct in6_addr *daddr, int len) 996493c6be3SSridhar Samudrala { 997493c6be3SSridhar Samudrala unsigned int offset; 998493c6be3SSridhar Samudrala struct udphdr *uh = udp_hdr(skb); 999d39d938cSVlad Yasevich struct sk_buff *frags = skb_shinfo(skb)->frag_list; 1000493c6be3SSridhar Samudrala __wsum csum = 0; 1001493c6be3SSridhar Samudrala 1002d39d938cSVlad Yasevich if (!frags) { 1003493c6be3SSridhar Samudrala /* Only one fragment on the socket. */ 1004493c6be3SSridhar Samudrala skb->csum_start = skb_transport_header(skb) - skb->head; 1005493c6be3SSridhar Samudrala skb->csum_offset = offsetof(struct udphdr, check); 1006493c6be3SSridhar Samudrala uh->check = ~csum_ipv6_magic(saddr, daddr, len, IPPROTO_UDP, 0); 1007493c6be3SSridhar Samudrala } else { 1008493c6be3SSridhar Samudrala /* 1009493c6be3SSridhar Samudrala * HW-checksum won't work as there are two or more 1010493c6be3SSridhar Samudrala * fragments on the socket so that all csums of sk_buffs 1011493c6be3SSridhar Samudrala * should be together 1012493c6be3SSridhar Samudrala */ 1013493c6be3SSridhar Samudrala offset = skb_transport_offset(skb); 1014493c6be3SSridhar Samudrala skb->csum = skb_checksum(skb, offset, skb->len - offset, 0); 1015493c6be3SSridhar Samudrala 1016493c6be3SSridhar Samudrala skb->ip_summed = CHECKSUM_NONE; 1017493c6be3SSridhar Samudrala 1018d39d938cSVlad Yasevich do { 1019d39d938cSVlad Yasevich csum = csum_add(csum, frags->csum); 1020d39d938cSVlad Yasevich } while ((frags = frags->next)); 1021493c6be3SSridhar Samudrala 1022493c6be3SSridhar Samudrala uh->check = csum_ipv6_magic(saddr, daddr, len, IPPROTO_UDP, 1023493c6be3SSridhar Samudrala csum); 1024493c6be3SSridhar Samudrala if (uh->check == 0) 1025493c6be3SSridhar Samudrala uh->check = CSUM_MANGLED_0; 1026493c6be3SSridhar Samudrala } 1027493c6be3SSridhar Samudrala } 1028493c6be3SSridhar Samudrala 1029db8dac20SDavid S. Miller /* 1030db8dac20SDavid S. Miller * Sending 1031db8dac20SDavid S. Miller */ 1032db8dac20SDavid S. Miller 1033d39d938cSVlad Yasevich static int udp_v6_send_skb(struct sk_buff *skb, struct flowi6 *fl6) 1034db8dac20SDavid S. Miller { 1035d39d938cSVlad Yasevich struct sock *sk = skb->sk; 1036db8dac20SDavid S. Miller struct udphdr *uh; 1037db8dac20SDavid S. Miller int err = 0; 1038db8dac20SDavid S. Miller int is_udplite = IS_UDPLITE(sk); 1039db8dac20SDavid S. Miller __wsum csum = 0; 1040d39d938cSVlad Yasevich int offset = skb_transport_offset(skb); 1041d39d938cSVlad Yasevich int len = skb->len - offset; 1042db8dac20SDavid S. Miller 1043db8dac20SDavid S. Miller /* 1044db8dac20SDavid S. Miller * Create a UDP header 1045db8dac20SDavid S. Miller */ 1046db8dac20SDavid S. Miller uh = udp_hdr(skb); 10471958b856SDavid S. Miller uh->source = fl6->fl6_sport; 10481958b856SDavid S. Miller uh->dest = fl6->fl6_dport; 1049d39d938cSVlad Yasevich uh->len = htons(len); 1050db8dac20SDavid S. Miller uh->check = 0; 1051db8dac20SDavid S. Miller 1052db8dac20SDavid S. Miller if (is_udplite) 1053d39d938cSVlad Yasevich csum = udplite_csum(skb); 1054d39d938cSVlad Yasevich else if (udp_sk(sk)->no_check6_tx) { /* UDP csum disabled */ 10554068579eSTom Herbert skb->ip_summed = CHECKSUM_NONE; 10564068579eSTom Herbert goto send; 10574068579eSTom Herbert } else if (skb->ip_summed == CHECKSUM_PARTIAL) { /* UDP hardware csum */ 1058d39d938cSVlad Yasevich udp6_hwcsum_outgoing(sk, skb, &fl6->saddr, &fl6->daddr, len); 1059493c6be3SSridhar Samudrala goto send; 1060493c6be3SSridhar Samudrala } else 1061d39d938cSVlad Yasevich csum = udp_csum(skb); 1062db8dac20SDavid S. Miller 1063db8dac20SDavid S. Miller /* add protocol-dependent pseudo-header */ 10644c9483b2SDavid S. Miller uh->check = csum_ipv6_magic(&fl6->saddr, &fl6->daddr, 1065d39d938cSVlad Yasevich len, fl6->flowi6_proto, csum); 1066db8dac20SDavid S. Miller if (uh->check == 0) 1067db8dac20SDavid S. Miller uh->check = CSUM_MANGLED_0; 1068db8dac20SDavid S. Miller 1069493c6be3SSridhar Samudrala send: 1070d39d938cSVlad Yasevich err = ip6_send_skb(skb); 10716ce9e7b5SEric Dumazet if (err) { 10726ce9e7b5SEric Dumazet if (err == -ENOBUFS && !inet6_sk(sk)->recverr) { 10736ce9e7b5SEric Dumazet UDP6_INC_STATS_USER(sock_net(sk), 10746ce9e7b5SEric Dumazet UDP_MIB_SNDBUFERRORS, is_udplite); 10756ce9e7b5SEric Dumazet err = 0; 10766ce9e7b5SEric Dumazet } 10776ce9e7b5SEric Dumazet } else 10786ce9e7b5SEric Dumazet UDP6_INC_STATS_USER(sock_net(sk), 10796ce9e7b5SEric Dumazet UDP_MIB_OUTDATAGRAMS, is_udplite); 1080d39d938cSVlad Yasevich return err; 1081d39d938cSVlad Yasevich } 1082d39d938cSVlad Yasevich 1083d39d938cSVlad Yasevich static int udp_v6_push_pending_frames(struct sock *sk) 1084d39d938cSVlad Yasevich { 1085d39d938cSVlad Yasevich struct sk_buff *skb; 1086d39d938cSVlad Yasevich struct udp_sock *up = udp_sk(sk); 1087d39d938cSVlad Yasevich struct flowi6 fl6; 1088d39d938cSVlad Yasevich int err = 0; 1089d39d938cSVlad Yasevich 1090d39d938cSVlad Yasevich if (up->pending == AF_INET) 1091d39d938cSVlad Yasevich return udp_push_pending_frames(sk); 1092d39d938cSVlad Yasevich 1093d39d938cSVlad Yasevich /* ip6_finish_skb will release the cork, so make a copy of 1094d39d938cSVlad Yasevich * fl6 here. 1095d39d938cSVlad Yasevich */ 1096d39d938cSVlad Yasevich fl6 = inet_sk(sk)->cork.fl.u.ip6; 1097d39d938cSVlad Yasevich 1098d39d938cSVlad Yasevich skb = ip6_finish_skb(sk); 1099d39d938cSVlad Yasevich if (!skb) 1100d39d938cSVlad Yasevich goto out; 1101d39d938cSVlad Yasevich 1102d39d938cSVlad Yasevich err = udp_v6_send_skb(skb, &fl6); 1103d39d938cSVlad Yasevich 1104db8dac20SDavid S. Miller out: 1105db8dac20SDavid S. Miller up->len = 0; 1106db8dac20SDavid S. Miller up->pending = 0; 1107db8dac20SDavid S. Miller return err; 1108db8dac20SDavid S. Miller } 1109db8dac20SDavid S. Miller 11101b784140SYing Xue int udpv6_sendmsg(struct sock *sk, struct msghdr *msg, size_t len) 1111db8dac20SDavid S. Miller { 1112db8dac20SDavid S. Miller struct ipv6_txoptions opt_space; 1113db8dac20SDavid S. Miller struct udp_sock *up = udp_sk(sk); 1114db8dac20SDavid S. Miller struct inet_sock *inet = inet_sk(sk); 1115db8dac20SDavid S. Miller struct ipv6_pinfo *np = inet6_sk(sk); 1116342dfc30SSteffen Hurrle DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, msg->msg_name); 111720c59de2SArnaud Ebalard struct in6_addr *daddr, *final_p, final; 1118db8dac20SDavid S. Miller struct ipv6_txoptions *opt = NULL; 111945f6fad8SEric Dumazet struct ipv6_txoptions *opt_to_free = NULL; 1120db8dac20SDavid S. Miller struct ip6_flowlabel *flowlabel = NULL; 11214c9483b2SDavid S. Miller struct flowi6 fl6; 1122db8dac20SDavid S. Miller struct dst_entry *dst; 1123db8dac20SDavid S. Miller int addr_len = msg->msg_namelen; 1124db8dac20SDavid S. Miller int ulen = len; 1125db8dac20SDavid S. Miller int hlimit = -1; 1126db8dac20SDavid S. Miller int tclass = -1; 112713b52cd4SBrian Haley int dontfrag = -1; 1128db8dac20SDavid S. Miller int corkreq = up->corkflag || msg->msg_flags&MSG_MORE; 1129db8dac20SDavid S. Miller int err; 1130db8dac20SDavid S. Miller int connected = 0; 1131db8dac20SDavid S. Miller int is_udplite = IS_UDPLITE(sk); 1132db8dac20SDavid S. Miller int (*getfrag)(void *, char *, int, int, int, struct sk_buff *); 1133db8dac20SDavid S. Miller 1134db8dac20SDavid S. Miller /* destination address check */ 1135db8dac20SDavid S. Miller if (sin6) { 1136db8dac20SDavid S. Miller if (addr_len < offsetof(struct sockaddr, sa_data)) 1137db8dac20SDavid S. Miller return -EINVAL; 1138db8dac20SDavid S. Miller 1139db8dac20SDavid S. Miller switch (sin6->sin6_family) { 1140db8dac20SDavid S. Miller case AF_INET6: 1141db8dac20SDavid S. Miller if (addr_len < SIN6_LEN_RFC2133) 1142db8dac20SDavid S. Miller return -EINVAL; 1143db8dac20SDavid S. Miller daddr = &sin6->sin6_addr; 1144db8dac20SDavid S. Miller break; 1145db8dac20SDavid S. Miller case AF_INET: 1146db8dac20SDavid S. Miller goto do_udp_sendmsg; 1147db8dac20SDavid S. Miller case AF_UNSPEC: 1148db8dac20SDavid S. Miller msg->msg_name = sin6 = NULL; 1149db8dac20SDavid S. Miller msg->msg_namelen = addr_len = 0; 1150db8dac20SDavid S. Miller daddr = NULL; 1151db8dac20SDavid S. Miller break; 1152db8dac20SDavid S. Miller default: 1153db8dac20SDavid S. Miller return -EINVAL; 1154db8dac20SDavid S. Miller } 1155db8dac20SDavid S. Miller } else if (!up->pending) { 1156db8dac20SDavid S. Miller if (sk->sk_state != TCP_ESTABLISHED) 1157db8dac20SDavid S. Miller return -EDESTADDRREQ; 1158efe4208fSEric Dumazet daddr = &sk->sk_v6_daddr; 1159db8dac20SDavid S. Miller } else 1160db8dac20SDavid S. Miller daddr = NULL; 1161db8dac20SDavid S. Miller 1162db8dac20SDavid S. Miller if (daddr) { 1163db8dac20SDavid S. Miller if (ipv6_addr_v4mapped(daddr)) { 1164db8dac20SDavid S. Miller struct sockaddr_in sin; 1165db8dac20SDavid S. Miller sin.sin_family = AF_INET; 1166c720c7e8SEric Dumazet sin.sin_port = sin6 ? sin6->sin6_port : inet->inet_dport; 1167db8dac20SDavid S. Miller sin.sin_addr.s_addr = daddr->s6_addr32[3]; 1168db8dac20SDavid S. Miller msg->msg_name = &sin; 1169db8dac20SDavid S. Miller msg->msg_namelen = sizeof(sin); 1170db8dac20SDavid S. Miller do_udp_sendmsg: 1171db8dac20SDavid S. Miller if (__ipv6_only_sock(sk)) 1172db8dac20SDavid S. Miller return -ENETUNREACH; 11731b784140SYing Xue return udp_sendmsg(sk, msg, len); 1174db8dac20SDavid S. Miller } 1175db8dac20SDavid S. Miller } 1176db8dac20SDavid S. Miller 1177db8dac20SDavid S. Miller if (up->pending == AF_INET) 11781b784140SYing Xue return udp_sendmsg(sk, msg, len); 1179db8dac20SDavid S. Miller 1180db8dac20SDavid S. Miller /* Rough check on arithmetic overflow, 1181db8dac20SDavid S. Miller better check is made in ip6_append_data(). 1182db8dac20SDavid S. Miller */ 1183db8dac20SDavid S. Miller if (len > INT_MAX - sizeof(struct udphdr)) 1184db8dac20SDavid S. Miller return -EMSGSIZE; 1185db8dac20SDavid S. Miller 118603485f2aSVlad Yasevich getfrag = is_udplite ? udplite_getfrag : ip_generic_getfrag; 1187db8dac20SDavid S. Miller if (up->pending) { 1188db8dac20SDavid S. Miller /* 1189db8dac20SDavid S. Miller * There are pending frames. 1190db8dac20SDavid S. Miller * The socket lock must be held while it's corked. 1191db8dac20SDavid S. Miller */ 1192db8dac20SDavid S. Miller lock_sock(sk); 1193db8dac20SDavid S. Miller if (likely(up->pending)) { 1194db8dac20SDavid S. Miller if (unlikely(up->pending != AF_INET6)) { 1195db8dac20SDavid S. Miller release_sock(sk); 1196db8dac20SDavid S. Miller return -EAFNOSUPPORT; 1197db8dac20SDavid S. Miller } 1198db8dac20SDavid S. Miller dst = NULL; 1199db8dac20SDavid S. Miller goto do_append_data; 1200db8dac20SDavid S. Miller } 1201db8dac20SDavid S. Miller release_sock(sk); 1202db8dac20SDavid S. Miller } 1203db8dac20SDavid S. Miller ulen += sizeof(struct udphdr); 1204db8dac20SDavid S. Miller 12054c9483b2SDavid S. Miller memset(&fl6, 0, sizeof(fl6)); 1206db8dac20SDavid S. Miller 1207db8dac20SDavid S. Miller if (sin6) { 1208db8dac20SDavid S. Miller if (sin6->sin6_port == 0) 1209db8dac20SDavid S. Miller return -EINVAL; 1210db8dac20SDavid S. Miller 12111958b856SDavid S. Miller fl6.fl6_dport = sin6->sin6_port; 1212db8dac20SDavid S. Miller daddr = &sin6->sin6_addr; 1213db8dac20SDavid S. Miller 1214db8dac20SDavid S. Miller if (np->sndflow) { 12154c9483b2SDavid S. Miller fl6.flowlabel = sin6->sin6_flowinfo&IPV6_FLOWINFO_MASK; 12164c9483b2SDavid S. Miller if (fl6.flowlabel&IPV6_FLOWLABEL_MASK) { 12174c9483b2SDavid S. Miller flowlabel = fl6_sock_lookup(sk, fl6.flowlabel); 121863159f29SIan Morris if (!flowlabel) 1219db8dac20SDavid S. Miller return -EINVAL; 1220db8dac20SDavid S. Miller } 1221db8dac20SDavid S. Miller } 1222db8dac20SDavid S. Miller 1223db8dac20SDavid S. Miller /* 1224db8dac20SDavid S. Miller * Otherwise it will be difficult to maintain 1225db8dac20SDavid S. Miller * sk->sk_dst_cache. 1226db8dac20SDavid S. Miller */ 1227db8dac20SDavid S. Miller if (sk->sk_state == TCP_ESTABLISHED && 1228efe4208fSEric Dumazet ipv6_addr_equal(daddr, &sk->sk_v6_daddr)) 1229efe4208fSEric Dumazet daddr = &sk->sk_v6_daddr; 1230db8dac20SDavid S. Miller 1231db8dac20SDavid S. Miller if (addr_len >= sizeof(struct sockaddr_in6) && 1232db8dac20SDavid S. Miller sin6->sin6_scope_id && 1233842df073SHannes Frederic Sowa __ipv6_addr_needs_scope_id(__ipv6_addr_type(daddr))) 12344c9483b2SDavid S. Miller fl6.flowi6_oif = sin6->sin6_scope_id; 1235db8dac20SDavid S. Miller } else { 1236db8dac20SDavid S. Miller if (sk->sk_state != TCP_ESTABLISHED) 1237db8dac20SDavid S. Miller return -EDESTADDRREQ; 1238db8dac20SDavid S. Miller 12391958b856SDavid S. Miller fl6.fl6_dport = inet->inet_dport; 1240efe4208fSEric Dumazet daddr = &sk->sk_v6_daddr; 12414c9483b2SDavid S. Miller fl6.flowlabel = np->flow_label; 1242db8dac20SDavid S. Miller connected = 1; 1243db8dac20SDavid S. Miller } 1244db8dac20SDavid S. Miller 12454c9483b2SDavid S. Miller if (!fl6.flowi6_oif) 12464c9483b2SDavid S. Miller fl6.flowi6_oif = sk->sk_bound_dev_if; 1247db8dac20SDavid S. Miller 12484c9483b2SDavid S. Miller if (!fl6.flowi6_oif) 12494c9483b2SDavid S. Miller fl6.flowi6_oif = np->sticky_pktinfo.ipi6_ifindex; 12509f690db7SYang Hongyang 12514c9483b2SDavid S. Miller fl6.flowi6_mark = sk->sk_mark; 125251953d5bSBrian Haley 1253db8dac20SDavid S. Miller if (msg->msg_controllen) { 1254db8dac20SDavid S. Miller opt = &opt_space; 1255db8dac20SDavid S. Miller memset(opt, 0, sizeof(struct ipv6_txoptions)); 1256db8dac20SDavid S. Miller opt->tot_len = sizeof(*opt); 1257db8dac20SDavid S. Miller 125873df66f8STom Parkin err = ip6_datagram_send_ctl(sock_net(sk), sk, msg, &fl6, opt, 1259ec0506dbSMaciej Żenczykowski &hlimit, &tclass, &dontfrag); 1260db8dac20SDavid S. Miller if (err < 0) { 1261db8dac20SDavid S. Miller fl6_sock_release(flowlabel); 1262db8dac20SDavid S. Miller return err; 1263db8dac20SDavid S. Miller } 12644c9483b2SDavid S. Miller if ((fl6.flowlabel&IPV6_FLOWLABEL_MASK) && !flowlabel) { 12654c9483b2SDavid S. Miller flowlabel = fl6_sock_lookup(sk, fl6.flowlabel); 126663159f29SIan Morris if (!flowlabel) 1267db8dac20SDavid S. Miller return -EINVAL; 1268db8dac20SDavid S. Miller } 1269db8dac20SDavid S. Miller if (!(opt->opt_nflen|opt->opt_flen)) 1270db8dac20SDavid S. Miller opt = NULL; 1271db8dac20SDavid S. Miller connected = 0; 1272db8dac20SDavid S. Miller } 127345f6fad8SEric Dumazet if (!opt) { 127445f6fad8SEric Dumazet opt = txopt_get(np); 127545f6fad8SEric Dumazet opt_to_free = opt; 127645f6fad8SEric Dumazet } 1277db8dac20SDavid S. Miller if (flowlabel) 1278db8dac20SDavid S. Miller opt = fl6_merge_options(&opt_space, flowlabel, opt); 1279db8dac20SDavid S. Miller opt = ipv6_fixup_options(&opt_space, opt); 1280db8dac20SDavid S. Miller 12814c9483b2SDavid S. Miller fl6.flowi6_proto = sk->sk_protocol; 1282876c7f41SBrian Haley if (!ipv6_addr_any(daddr)) 12834e3fd7a0SAlexey Dobriyan fl6.daddr = *daddr; 1284876c7f41SBrian Haley else 12854c9483b2SDavid S. Miller fl6.daddr.s6_addr[15] = 0x1; /* :: means loopback (BSD'ism) */ 12864c9483b2SDavid S. Miller if (ipv6_addr_any(&fl6.saddr) && !ipv6_addr_any(&np->saddr)) 12874e3fd7a0SAlexey Dobriyan fl6.saddr = np->saddr; 12881958b856SDavid S. Miller fl6.fl6_sport = inet->inet_sport; 1289db8dac20SDavid S. Miller 12904c9483b2SDavid S. Miller final_p = fl6_update_dst(&fl6, opt, &final); 129120c59de2SArnaud Ebalard if (final_p) 1292db8dac20SDavid S. Miller connected = 0; 1293db8dac20SDavid S. Miller 12944c9483b2SDavid S. Miller if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr)) { 12954c9483b2SDavid S. Miller fl6.flowi6_oif = np->mcast_oif; 1296db8dac20SDavid S. Miller connected = 0; 1297c4062dfcSErich E. Hoover } else if (!fl6.flowi6_oif) 1298c4062dfcSErich E. Hoover fl6.flowi6_oif = np->ucast_oif; 1299db8dac20SDavid S. Miller 13004c9483b2SDavid S. Miller security_sk_classify_flow(sk, flowi6_to_flowi(&fl6)); 1301db8dac20SDavid S. Miller 13020e0d44abSSteffen Klassert dst = ip6_sk_dst_lookup_flow(sk, &fl6, final_p); 130368d0c6d3SDavid S. Miller if (IS_ERR(dst)) { 130468d0c6d3SDavid S. Miller err = PTR_ERR(dst); 130568d0c6d3SDavid S. Miller dst = NULL; 1306db8dac20SDavid S. Miller goto out; 1307db8dac20SDavid S. Miller } 1308db8dac20SDavid S. Miller 1309db8dac20SDavid S. Miller if (hlimit < 0) 13105c98631cSLorenzo Colitti hlimit = ip6_sk_dst_hoplimit(np, &fl6, dst); 1311db8dac20SDavid S. Miller 1312db8dac20SDavid S. Miller if (tclass < 0) 1313e651f03aSGerrit Renker tclass = np->tclass; 1314db8dac20SDavid S. Miller 1315db8dac20SDavid S. Miller if (msg->msg_flags&MSG_CONFIRM) 1316db8dac20SDavid S. Miller goto do_confirm; 1317db8dac20SDavid S. Miller back_from_confirm: 1318db8dac20SDavid S. Miller 131903485f2aSVlad Yasevich /* Lockless fast path for the non-corking case */ 132003485f2aSVlad Yasevich if (!corkreq) { 132103485f2aSVlad Yasevich struct sk_buff *skb; 132203485f2aSVlad Yasevich 132303485f2aSVlad Yasevich skb = ip6_make_skb(sk, getfrag, msg, ulen, 132403485f2aSVlad Yasevich sizeof(struct udphdr), hlimit, tclass, opt, 132503485f2aSVlad Yasevich &fl6, (struct rt6_info *)dst, 132603485f2aSVlad Yasevich msg->msg_flags, dontfrag); 132703485f2aSVlad Yasevich err = PTR_ERR(skb); 132803485f2aSVlad Yasevich if (!IS_ERR_OR_NULL(skb)) 132903485f2aSVlad Yasevich err = udp_v6_send_skb(skb, &fl6); 133003485f2aSVlad Yasevich goto release_dst; 133103485f2aSVlad Yasevich } 133203485f2aSVlad Yasevich 1333db8dac20SDavid S. Miller lock_sock(sk); 1334db8dac20SDavid S. Miller if (unlikely(up->pending)) { 1335db8dac20SDavid S. Miller /* The socket is already corked while preparing it. */ 1336db8dac20SDavid S. Miller /* ... which is an evident application bug. --ANK */ 1337db8dac20SDavid S. Miller release_sock(sk); 1338db8dac20SDavid S. Miller 1339ba7a46f1SJoe Perches net_dbg_ratelimited("udp cork app bug 2\n"); 1340db8dac20SDavid S. Miller err = -EINVAL; 1341db8dac20SDavid S. Miller goto out; 1342db8dac20SDavid S. Miller } 1343db8dac20SDavid S. Miller 1344db8dac20SDavid S. Miller up->pending = AF_INET6; 1345db8dac20SDavid S. Miller 1346db8dac20SDavid S. Miller do_append_data: 1347e36d3ff9SJiri Pirko if (dontfrag < 0) 1348e36d3ff9SJiri Pirko dontfrag = np->dontfrag; 1349db8dac20SDavid S. Miller up->len += ulen; 1350f69e6d13SAl Viro err = ip6_append_data(sk, getfrag, msg, ulen, 13514c9483b2SDavid S. Miller sizeof(struct udphdr), hlimit, tclass, opt, &fl6, 1352db8dac20SDavid S. Miller (struct rt6_info *)dst, 135313b52cd4SBrian Haley corkreq ? msg->msg_flags|MSG_MORE : msg->msg_flags, dontfrag); 1354db8dac20SDavid S. Miller if (err) 1355db8dac20SDavid S. Miller udp_v6_flush_pending_frames(sk); 1356db8dac20SDavid S. Miller else if (!corkreq) 1357db8dac20SDavid S. Miller err = udp_v6_push_pending_frames(sk); 1358db8dac20SDavid S. Miller else if (unlikely(skb_queue_empty(&sk->sk_write_queue))) 1359db8dac20SDavid S. Miller up->pending = 0; 1360db8dac20SDavid S. Miller 136103485f2aSVlad Yasevich if (err > 0) 136203485f2aSVlad Yasevich err = np->recverr ? net_xmit_errno(err) : 0; 136303485f2aSVlad Yasevich release_sock(sk); 136403485f2aSVlad Yasevich 136503485f2aSVlad Yasevich release_dst: 1366db8dac20SDavid S. Miller if (dst) { 1367db8dac20SDavid S. Miller if (connected) { 1368db8dac20SDavid S. Miller ip6_dst_store(sk, dst, 1369efe4208fSEric Dumazet ipv6_addr_equal(&fl6.daddr, &sk->sk_v6_daddr) ? 1370efe4208fSEric Dumazet &sk->sk_v6_daddr : NULL, 1371db8dac20SDavid S. Miller #ifdef CONFIG_IPV6_SUBTREES 13724c9483b2SDavid S. Miller ipv6_addr_equal(&fl6.saddr, &np->saddr) ? 1373db8dac20SDavid S. Miller &np->saddr : 1374db8dac20SDavid S. Miller #endif 1375db8dac20SDavid S. Miller NULL); 1376db8dac20SDavid S. Miller } else { 1377db8dac20SDavid S. Miller dst_release(dst); 1378db8dac20SDavid S. Miller } 1379a3c96089SYOSHIFUJI Hideaki dst = NULL; 1380db8dac20SDavid S. Miller } 1381db8dac20SDavid S. Miller 1382db8dac20SDavid S. Miller out: 1383a3c96089SYOSHIFUJI Hideaki dst_release(dst); 1384db8dac20SDavid S. Miller fl6_sock_release(flowlabel); 138545f6fad8SEric Dumazet txopt_put(opt_to_free); 1386db8dac20SDavid S. Miller if (!err) 1387db8dac20SDavid S. Miller return len; 1388db8dac20SDavid S. Miller /* 1389db8dac20SDavid S. Miller * ENOBUFS = no kernel mem, SOCK_NOSPACE = no sndbuf space. Reporting 1390db8dac20SDavid S. Miller * ENOBUFS might not be good (it's not tunable per se), but otherwise 1391db8dac20SDavid S. Miller * we don't have a good statistic (IpOutDiscards but it can be too many 1392db8dac20SDavid S. Miller * things). We could add another new stat but at least for now that 1393db8dac20SDavid S. Miller * seems like overkill. 1394db8dac20SDavid S. Miller */ 1395db8dac20SDavid S. Miller if (err == -ENOBUFS || test_bit(SOCK_NOSPACE, &sk->sk_socket->flags)) { 1396235b9f7aSPavel Emelyanov UDP6_INC_STATS_USER(sock_net(sk), 1397235b9f7aSPavel Emelyanov UDP_MIB_SNDBUFERRORS, is_udplite); 1398db8dac20SDavid S. Miller } 1399db8dac20SDavid S. Miller return err; 1400db8dac20SDavid S. Miller 1401db8dac20SDavid S. Miller do_confirm: 1402db8dac20SDavid S. Miller dst_confirm(dst); 1403db8dac20SDavid S. Miller if (!(msg->msg_flags&MSG_PROBE) || len) 1404db8dac20SDavid S. Miller goto back_from_confirm; 1405db8dac20SDavid S. Miller err = 0; 1406db8dac20SDavid S. Miller goto out; 1407db8dac20SDavid S. Miller } 1408db8dac20SDavid S. Miller 14097d06b2e0SBrian Haley void udpv6_destroy_sock(struct sock *sk) 1410db8dac20SDavid S. Miller { 141144046a59STom Parkin struct udp_sock *up = udp_sk(sk); 1412db8dac20SDavid S. Miller lock_sock(sk); 1413db8dac20SDavid S. Miller udp_v6_flush_pending_frames(sk); 1414db8dac20SDavid S. Miller release_sock(sk); 1415db8dac20SDavid S. Miller 141644046a59STom Parkin if (static_key_false(&udpv6_encap_needed) && up->encap_type) { 141744046a59STom Parkin void (*encap_destroy)(struct sock *sk); 141844046a59STom Parkin encap_destroy = ACCESS_ONCE(up->encap_destroy); 141944046a59STom Parkin if (encap_destroy) 142044046a59STom Parkin encap_destroy(sk); 142144046a59STom Parkin } 142244046a59STom Parkin 1423db8dac20SDavid S. Miller inet6_destroy_sock(sk); 1424db8dac20SDavid S. Miller } 1425db8dac20SDavid S. Miller 1426db8dac20SDavid S. Miller /* 1427db8dac20SDavid S. Miller * Socket option code for UDP 1428db8dac20SDavid S. Miller */ 1429db8dac20SDavid S. Miller int udpv6_setsockopt(struct sock *sk, int level, int optname, 1430b7058842SDavid S. Miller char __user *optval, unsigned int optlen) 1431db8dac20SDavid S. Miller { 1432db8dac20SDavid S. Miller if (level == SOL_UDP || level == SOL_UDPLITE) 1433db8dac20SDavid S. Miller return udp_lib_setsockopt(sk, level, optname, optval, optlen, 1434db8dac20SDavid S. Miller udp_v6_push_pending_frames); 1435db8dac20SDavid S. Miller return ipv6_setsockopt(sk, level, optname, optval, optlen); 1436db8dac20SDavid S. Miller } 1437db8dac20SDavid S. Miller 1438db8dac20SDavid S. Miller #ifdef CONFIG_COMPAT 1439db8dac20SDavid S. Miller int compat_udpv6_setsockopt(struct sock *sk, int level, int optname, 1440b7058842SDavid S. Miller char __user *optval, unsigned int optlen) 1441db8dac20SDavid S. Miller { 1442db8dac20SDavid S. Miller if (level == SOL_UDP || level == SOL_UDPLITE) 1443db8dac20SDavid S. Miller return udp_lib_setsockopt(sk, level, optname, optval, optlen, 1444db8dac20SDavid S. Miller udp_v6_push_pending_frames); 1445db8dac20SDavid S. Miller return compat_ipv6_setsockopt(sk, level, optname, optval, optlen); 1446db8dac20SDavid S. Miller } 1447db8dac20SDavid S. Miller #endif 1448db8dac20SDavid S. Miller 1449db8dac20SDavid S. Miller int udpv6_getsockopt(struct sock *sk, int level, int optname, 1450db8dac20SDavid S. Miller char __user *optval, int __user *optlen) 1451db8dac20SDavid S. Miller { 1452db8dac20SDavid S. Miller if (level == SOL_UDP || level == SOL_UDPLITE) 1453db8dac20SDavid S. Miller return udp_lib_getsockopt(sk, level, optname, optval, optlen); 1454db8dac20SDavid S. Miller return ipv6_getsockopt(sk, level, optname, optval, optlen); 1455db8dac20SDavid S. Miller } 1456db8dac20SDavid S. Miller 1457db8dac20SDavid S. Miller #ifdef CONFIG_COMPAT 1458db8dac20SDavid S. Miller int compat_udpv6_getsockopt(struct sock *sk, int level, int optname, 1459db8dac20SDavid S. Miller char __user *optval, int __user *optlen) 1460db8dac20SDavid S. Miller { 1461db8dac20SDavid S. Miller if (level == SOL_UDP || level == SOL_UDPLITE) 1462db8dac20SDavid S. Miller return udp_lib_getsockopt(sk, level, optname, optval, optlen); 1463db8dac20SDavid S. Miller return compat_ipv6_getsockopt(sk, level, optname, optval, optlen); 1464db8dac20SDavid S. Miller } 1465db8dac20SDavid S. Miller #endif 1466db8dac20SDavid S. Miller 146741135cc8SAlexey Dobriyan static const struct inet6_protocol udpv6_protocol = { 1468db8dac20SDavid S. Miller .handler = udpv6_rcv, 1469db8dac20SDavid S. Miller .err_handler = udpv6_err, 1470db8dac20SDavid S. Miller .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL, 1471db8dac20SDavid S. Miller }; 1472db8dac20SDavid S. Miller 1473db8dac20SDavid S. Miller /* ------------------------------------------------------------------------ */ 1474db8dac20SDavid S. Miller #ifdef CONFIG_PROC_FS 1475db8dac20SDavid S. Miller int udp6_seq_show(struct seq_file *seq, void *v) 1476db8dac20SDavid S. Miller { 147717ef66afSLorenzo Colitti if (v == SEQ_START_TOKEN) { 147817ef66afSLorenzo Colitti seq_puts(seq, IPV6_SEQ_DGRAM_HEADER); 147917ef66afSLorenzo Colitti } else { 148017ef66afSLorenzo Colitti int bucket = ((struct udp_iter_state *)seq->private)->bucket; 148117ef66afSLorenzo Colitti struct inet_sock *inet = inet_sk(v); 148217ef66afSLorenzo Colitti __u16 srcp = ntohs(inet->inet_sport); 148317ef66afSLorenzo Colitti __u16 destp = ntohs(inet->inet_dport); 148417ef66afSLorenzo Colitti ip6_dgram_sock_seq_show(seq, v, srcp, destp, bucket); 148517ef66afSLorenzo Colitti } 1486db8dac20SDavid S. Miller return 0; 1487db8dac20SDavid S. Miller } 1488db8dac20SDavid S. Miller 148973cb88ecSArjan van de Ven static const struct file_operations udp6_afinfo_seq_fops = { 149073cb88ecSArjan van de Ven .owner = THIS_MODULE, 149173cb88ecSArjan van de Ven .open = udp_seq_open, 149273cb88ecSArjan van de Ven .read = seq_read, 149373cb88ecSArjan van de Ven .llseek = seq_lseek, 149473cb88ecSArjan van de Ven .release = seq_release_net 149573cb88ecSArjan van de Ven }; 149673cb88ecSArjan van de Ven 1497db8dac20SDavid S. Miller static struct udp_seq_afinfo udp6_seq_afinfo = { 1498db8dac20SDavid S. Miller .name = "udp6", 1499db8dac20SDavid S. Miller .family = AF_INET6, 1500645ca708SEric Dumazet .udp_table = &udp_table, 150173cb88ecSArjan van de Ven .seq_fops = &udp6_afinfo_seq_fops, 1502dda61925SDenis V. Lunev .seq_ops = { 1503dda61925SDenis V. Lunev .show = udp6_seq_show, 1504dda61925SDenis V. Lunev }, 1505db8dac20SDavid S. Miller }; 1506db8dac20SDavid S. Miller 15072c8c1e72SAlexey Dobriyan int __net_init udp6_proc_init(struct net *net) 1508db8dac20SDavid S. Miller { 15090c96d8c5SDaniel Lezcano return udp_proc_register(net, &udp6_seq_afinfo); 1510db8dac20SDavid S. Miller } 1511db8dac20SDavid S. Miller 1512ec120da6SIan Morris void udp6_proc_exit(struct net *net) 1513ec120da6SIan Morris { 15140c96d8c5SDaniel Lezcano udp_proc_unregister(net, &udp6_seq_afinfo); 1515db8dac20SDavid S. Miller } 1516db8dac20SDavid S. Miller #endif /* CONFIG_PROC_FS */ 1517db8dac20SDavid S. Miller 1518f77d6021SEric Dumazet void udp_v6_clear_sk(struct sock *sk, int size) 1519f77d6021SEric Dumazet { 1520f77d6021SEric Dumazet struct inet_sock *inet = inet_sk(sk); 1521f77d6021SEric Dumazet 1522f77d6021SEric Dumazet /* we do not want to clear pinet6 field, because of RCU lookups */ 1523f77d6021SEric Dumazet sk_prot_clear_portaddr_nulls(sk, offsetof(struct inet_sock, pinet6)); 1524f77d6021SEric Dumazet 1525f77d6021SEric Dumazet size -= offsetof(struct inet_sock, pinet6) + sizeof(inet->pinet6); 1526f77d6021SEric Dumazet memset(&inet->pinet6 + 1, 0, size); 1527f77d6021SEric Dumazet } 1528f77d6021SEric Dumazet 1529db8dac20SDavid S. Miller /* ------------------------------------------------------------------------ */ 1530db8dac20SDavid S. Miller 1531db8dac20SDavid S. Miller struct proto udpv6_prot = { 1532db8dac20SDavid S. Miller .name = "UDPv6", 1533db8dac20SDavid S. Miller .owner = THIS_MODULE, 1534db8dac20SDavid S. Miller .close = udp_lib_close, 1535db8dac20SDavid S. Miller .connect = ip6_datagram_connect, 1536db8dac20SDavid S. Miller .disconnect = udp_disconnect, 1537db8dac20SDavid S. Miller .ioctl = udp_ioctl, 1538db8dac20SDavid S. Miller .destroy = udpv6_destroy_sock, 1539db8dac20SDavid S. Miller .setsockopt = udpv6_setsockopt, 1540db8dac20SDavid S. Miller .getsockopt = udpv6_getsockopt, 1541db8dac20SDavid S. Miller .sendmsg = udpv6_sendmsg, 1542db8dac20SDavid S. Miller .recvmsg = udpv6_recvmsg, 1543f7ad74feSBenjamin LaHaise .backlog_rcv = __udpv6_queue_rcv_skb, 1544db8dac20SDavid S. Miller .hash = udp_lib_hash, 1545db8dac20SDavid S. Miller .unhash = udp_lib_unhash, 1546719f8358SEric Dumazet .rehash = udp_v6_rehash, 1547db8dac20SDavid S. Miller .get_port = udp_v6_get_port, 1548db8dac20SDavid S. Miller .memory_allocated = &udp_memory_allocated, 1549db8dac20SDavid S. Miller .sysctl_mem = sysctl_udp_mem, 1550db8dac20SDavid S. Miller .sysctl_wmem = &sysctl_udp_wmem_min, 1551db8dac20SDavid S. Miller .sysctl_rmem = &sysctl_udp_rmem_min, 1552db8dac20SDavid S. Miller .obj_size = sizeof(struct udp6_sock), 1553271b72c7SEric Dumazet .slab_flags = SLAB_DESTROY_BY_RCU, 1554645ca708SEric Dumazet .h.udp_table = &udp_table, 1555db8dac20SDavid S. Miller #ifdef CONFIG_COMPAT 1556db8dac20SDavid S. Miller .compat_setsockopt = compat_udpv6_setsockopt, 1557db8dac20SDavid S. Miller .compat_getsockopt = compat_udpv6_getsockopt, 1558db8dac20SDavid S. Miller #endif 1559f77d6021SEric Dumazet .clear_sk = udp_v6_clear_sk, 1560db8dac20SDavid S. Miller }; 1561db8dac20SDavid S. Miller 1562db8dac20SDavid S. Miller static struct inet_protosw udpv6_protosw = { 1563db8dac20SDavid S. Miller .type = SOCK_DGRAM, 1564db8dac20SDavid S. Miller .protocol = IPPROTO_UDP, 1565db8dac20SDavid S. Miller .prot = &udpv6_prot, 1566db8dac20SDavid S. Miller .ops = &inet6_dgram_ops, 1567db8dac20SDavid S. Miller .flags = INET_PROTOSW_PERMANENT, 1568db8dac20SDavid S. Miller }; 1569db8dac20SDavid S. Miller 1570db8dac20SDavid S. Miller int __init udpv6_init(void) 1571db8dac20SDavid S. Miller { 1572db8dac20SDavid S. Miller int ret; 1573db8dac20SDavid S. Miller 15743336288aSVlad Yasevich ret = inet6_add_protocol(&udpv6_protocol, IPPROTO_UDP); 15753336288aSVlad Yasevich if (ret) 1576c6b641a4SVlad Yasevich goto out; 15773336288aSVlad Yasevich 1578db8dac20SDavid S. Miller ret = inet6_register_protosw(&udpv6_protosw); 1579db8dac20SDavid S. Miller if (ret) 1580db8dac20SDavid S. Miller goto out_udpv6_protocol; 1581db8dac20SDavid S. Miller out: 1582db8dac20SDavid S. Miller return ret; 1583db8dac20SDavid S. Miller 1584db8dac20SDavid S. Miller out_udpv6_protocol: 1585db8dac20SDavid S. Miller inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP); 1586db8dac20SDavid S. Miller goto out; 1587db8dac20SDavid S. Miller } 1588db8dac20SDavid S. Miller 1589db8dac20SDavid S. Miller void udpv6_exit(void) 1590db8dac20SDavid S. Miller { 1591db8dac20SDavid S. Miller inet6_unregister_protosw(&udpv6_protosw); 1592db8dac20SDavid S. Miller inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP); 1593db8dac20SDavid S. Miller } 1594