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> 49db8dac20SDavid S. Miller 50db8dac20SDavid S. Miller #include <linux/proc_fs.h> 51db8dac20SDavid S. Miller #include <linux/seq_file.h> 5222911fc5SEric Dumazet #include <trace/events/skb.h> 53db8dac20SDavid S. Miller #include "udp_impl.h" 54db8dac20SDavid S. Miller 55b2f5e7cdSVlad Yasevich int ipv6_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2) 56b2f5e7cdSVlad Yasevich { 57b2f5e7cdSVlad Yasevich const struct in6_addr *sk_rcv_saddr6 = &inet6_sk(sk)->rcv_saddr; 58b2f5e7cdSVlad Yasevich const struct in6_addr *sk2_rcv_saddr6 = inet6_rcv_saddr(sk2); 5968835abaSEric Dumazet __be32 sk1_rcv_saddr = sk_rcv_saddr(sk); 6068835abaSEric Dumazet __be32 sk2_rcv_saddr = sk_rcv_saddr(sk2); 61b2f5e7cdSVlad Yasevich int sk_ipv6only = ipv6_only_sock(sk); 62b2f5e7cdSVlad Yasevich int sk2_ipv6only = inet_v6_ipv6only(sk2); 63b2f5e7cdSVlad Yasevich int addr_type = ipv6_addr_type(sk_rcv_saddr6); 64b2f5e7cdSVlad Yasevich int addr_type2 = sk2_rcv_saddr6 ? ipv6_addr_type(sk2_rcv_saddr6) : IPV6_ADDR_MAPPED; 65b2f5e7cdSVlad Yasevich 66b2f5e7cdSVlad Yasevich /* if both are mapped, treat as IPv4 */ 67b2f5e7cdSVlad Yasevich if (addr_type == IPV6_ADDR_MAPPED && addr_type2 == IPV6_ADDR_MAPPED) 68499923c7SVlad Yasevich return (!sk2_ipv6only && 69c720c7e8SEric Dumazet (!sk1_rcv_saddr || !sk2_rcv_saddr || 70c720c7e8SEric Dumazet sk1_rcv_saddr == sk2_rcv_saddr)); 71b2f5e7cdSVlad Yasevich 72b2f5e7cdSVlad Yasevich if (addr_type2 == IPV6_ADDR_ANY && 73b2f5e7cdSVlad Yasevich !(sk2_ipv6only && addr_type == IPV6_ADDR_MAPPED)) 74b2f5e7cdSVlad Yasevich return 1; 75b2f5e7cdSVlad Yasevich 76b2f5e7cdSVlad Yasevich if (addr_type == IPV6_ADDR_ANY && 77b2f5e7cdSVlad Yasevich !(sk_ipv6only && addr_type2 == IPV6_ADDR_MAPPED)) 78b2f5e7cdSVlad Yasevich return 1; 79b2f5e7cdSVlad Yasevich 80b2f5e7cdSVlad Yasevich if (sk2_rcv_saddr6 && 81b2f5e7cdSVlad Yasevich ipv6_addr_equal(sk_rcv_saddr6, sk2_rcv_saddr6)) 82b2f5e7cdSVlad Yasevich return 1; 83b2f5e7cdSVlad Yasevich 84b2f5e7cdSVlad Yasevich return 0; 85b2f5e7cdSVlad Yasevich } 86b2f5e7cdSVlad Yasevich 87d4cada4aSEric Dumazet static unsigned int udp6_portaddr_hash(struct net *net, 88d4cada4aSEric Dumazet const struct in6_addr *addr6, 89d4cada4aSEric Dumazet unsigned int port) 90d4cada4aSEric Dumazet { 91d4cada4aSEric Dumazet unsigned int hash, mix = net_hash_mix(net); 92d4cada4aSEric Dumazet 93d4cada4aSEric Dumazet if (ipv6_addr_any(addr6)) 94d4cada4aSEric Dumazet hash = jhash_1word(0, mix); 95856540eeSBrian Haley else if (ipv6_addr_v4mapped(addr6)) 960eae88f3SEric Dumazet hash = jhash_1word((__force u32)addr6->s6_addr32[3], mix); 97d4cada4aSEric Dumazet else 980eae88f3SEric Dumazet hash = jhash2((__force u32 *)addr6->s6_addr32, 4, mix); 99d4cada4aSEric Dumazet 100d4cada4aSEric Dumazet return hash ^ port; 101d4cada4aSEric Dumazet } 102d4cada4aSEric Dumazet 103d4cada4aSEric Dumazet 1046ba5a3c5SPavel Emelyanov int udp_v6_get_port(struct sock *sk, unsigned short snum) 105db8dac20SDavid S. Miller { 10630fff923SEric Dumazet unsigned int hash2_nulladdr = 10730fff923SEric Dumazet udp6_portaddr_hash(sock_net(sk), &in6addr_any, snum); 10830fff923SEric Dumazet unsigned int hash2_partial = 10930fff923SEric Dumazet udp6_portaddr_hash(sock_net(sk), &inet6_sk(sk)->rcv_saddr, 0); 11030fff923SEric Dumazet 111d4cada4aSEric Dumazet /* precompute partial secondary hash */ 11230fff923SEric Dumazet udp_sk(sk)->udp_portaddr_hash = hash2_partial; 11330fff923SEric Dumazet return udp_lib_get_port(sk, snum, ipv6_rcv_saddr_equal, hash2_nulladdr); 114db8dac20SDavid S. Miller } 115db8dac20SDavid S. Miller 116719f8358SEric Dumazet static void udp_v6_rehash(struct sock *sk) 117719f8358SEric Dumazet { 118719f8358SEric Dumazet u16 new_hash = udp6_portaddr_hash(sock_net(sk), 119719f8358SEric Dumazet &inet6_sk(sk)->rcv_saddr, 120719f8358SEric Dumazet inet_sk(sk)->inet_num); 121719f8358SEric Dumazet 122719f8358SEric Dumazet udp_lib_rehash(sk, new_hash); 123719f8358SEric Dumazet } 124719f8358SEric Dumazet 125645ca708SEric Dumazet static inline int compute_score(struct sock *sk, struct net *net, 126645ca708SEric Dumazet unsigned short hnum, 12788440ae7SBalazs Scheidler const struct in6_addr *saddr, __be16 sport, 12888440ae7SBalazs Scheidler const struct in6_addr *daddr, __be16 dport, 129645ca708SEric Dumazet int dif) 130db8dac20SDavid S. Miller { 131645ca708SEric Dumazet int score = -1; 132db8dac20SDavid S. Miller 133d4cada4aSEric Dumazet if (net_eq(sock_net(sk), net) && udp_sk(sk)->udp_port_hash == hnum && 134db8dac20SDavid S. Miller sk->sk_family == PF_INET6) { 135db8dac20SDavid S. Miller struct ipv6_pinfo *np = inet6_sk(sk); 136645ca708SEric Dumazet struct inet_sock *inet = inet_sk(sk); 137645ca708SEric Dumazet 138645ca708SEric Dumazet score = 0; 139c720c7e8SEric Dumazet if (inet->inet_dport) { 140c720c7e8SEric Dumazet if (inet->inet_dport != sport) 141645ca708SEric Dumazet return -1; 142db8dac20SDavid S. Miller score++; 143db8dac20SDavid S. Miller } 144db8dac20SDavid S. Miller if (!ipv6_addr_any(&np->rcv_saddr)) { 145db8dac20SDavid S. Miller if (!ipv6_addr_equal(&np->rcv_saddr, daddr)) 146645ca708SEric Dumazet return -1; 147db8dac20SDavid S. Miller score++; 148db8dac20SDavid S. Miller } 149db8dac20SDavid S. Miller if (!ipv6_addr_any(&np->daddr)) { 150db8dac20SDavid S. Miller if (!ipv6_addr_equal(&np->daddr, saddr)) 151645ca708SEric Dumazet return -1; 152db8dac20SDavid S. Miller score++; 153db8dac20SDavid S. Miller } 154db8dac20SDavid S. Miller if (sk->sk_bound_dev_if) { 155db8dac20SDavid S. Miller if (sk->sk_bound_dev_if != dif) 156645ca708SEric Dumazet return -1; 157db8dac20SDavid S. Miller score++; 158db8dac20SDavid S. Miller } 159645ca708SEric Dumazet } 160645ca708SEric Dumazet return score; 161645ca708SEric Dumazet } 162645ca708SEric Dumazet 163fddc17deSEric Dumazet #define SCORE2_MAX (1 + 1 + 1) 164fddc17deSEric Dumazet static inline int compute_score2(struct sock *sk, struct net *net, 165fddc17deSEric Dumazet const struct in6_addr *saddr, __be16 sport, 166fddc17deSEric Dumazet const struct in6_addr *daddr, unsigned short hnum, 167fddc17deSEric Dumazet int dif) 168fddc17deSEric Dumazet { 169fddc17deSEric Dumazet int score = -1; 170fddc17deSEric Dumazet 171fddc17deSEric Dumazet if (net_eq(sock_net(sk), net) && udp_sk(sk)->udp_port_hash == hnum && 172fddc17deSEric Dumazet sk->sk_family == PF_INET6) { 173fddc17deSEric Dumazet struct ipv6_pinfo *np = inet6_sk(sk); 174fddc17deSEric Dumazet struct inet_sock *inet = inet_sk(sk); 175fddc17deSEric Dumazet 176fddc17deSEric Dumazet if (!ipv6_addr_equal(&np->rcv_saddr, daddr)) 177fddc17deSEric Dumazet return -1; 178fddc17deSEric Dumazet score = 0; 179fddc17deSEric Dumazet if (inet->inet_dport) { 180fddc17deSEric Dumazet if (inet->inet_dport != sport) 181fddc17deSEric Dumazet return -1; 182fddc17deSEric Dumazet score++; 183fddc17deSEric Dumazet } 184fddc17deSEric Dumazet if (!ipv6_addr_any(&np->daddr)) { 185fddc17deSEric Dumazet if (!ipv6_addr_equal(&np->daddr, saddr)) 186fddc17deSEric Dumazet return -1; 187fddc17deSEric Dumazet score++; 188fddc17deSEric Dumazet } 189fddc17deSEric Dumazet if (sk->sk_bound_dev_if) { 190fddc17deSEric Dumazet if (sk->sk_bound_dev_if != dif) 191fddc17deSEric Dumazet return -1; 192fddc17deSEric Dumazet score++; 193fddc17deSEric Dumazet } 194fddc17deSEric Dumazet } 195fddc17deSEric Dumazet return score; 196fddc17deSEric Dumazet } 197fddc17deSEric Dumazet 198fddc17deSEric Dumazet 199fddc17deSEric Dumazet /* called with read_rcu_lock() */ 200fddc17deSEric Dumazet static struct sock *udp6_lib_lookup2(struct net *net, 201fddc17deSEric Dumazet const struct in6_addr *saddr, __be16 sport, 202fddc17deSEric Dumazet const struct in6_addr *daddr, unsigned int hnum, int dif, 203fddc17deSEric Dumazet struct udp_hslot *hslot2, unsigned int slot2) 204fddc17deSEric Dumazet { 205fddc17deSEric Dumazet struct sock *sk, *result; 206fddc17deSEric Dumazet struct hlist_nulls_node *node; 20772289b96STom Herbert int score, badness, matches = 0, reuseport = 0; 20872289b96STom Herbert u32 hash = 0; 209fddc17deSEric Dumazet 210fddc17deSEric Dumazet begin: 211fddc17deSEric Dumazet result = NULL; 212fddc17deSEric Dumazet badness = -1; 213fddc17deSEric Dumazet udp_portaddr_for_each_entry_rcu(sk, node, &hslot2->head) { 214fddc17deSEric Dumazet score = compute_score2(sk, net, saddr, sport, 215fddc17deSEric Dumazet daddr, hnum, dif); 216fddc17deSEric Dumazet if (score > badness) { 217fddc17deSEric Dumazet result = sk; 218fddc17deSEric Dumazet badness = score; 21972289b96STom Herbert reuseport = sk->sk_reuseport; 22072289b96STom Herbert if (reuseport) { 22172289b96STom Herbert hash = inet6_ehashfn(net, daddr, hnum, 22272289b96STom Herbert saddr, sport); 22372289b96STom Herbert matches = 1; 22472289b96STom Herbert } else if (score == SCORE2_MAX) 225fddc17deSEric Dumazet goto exact_match; 22672289b96STom Herbert } else if (score == badness && reuseport) { 22772289b96STom Herbert matches++; 22872289b96STom Herbert if (((u64)hash * matches) >> 32 == 0) 22972289b96STom Herbert result = sk; 23072289b96STom Herbert hash = next_pseudo_random32(hash); 231fddc17deSEric Dumazet } 232fddc17deSEric Dumazet } 233fddc17deSEric Dumazet /* 234fddc17deSEric Dumazet * if the nulls value we got at the end of this lookup is 235fddc17deSEric Dumazet * not the expected one, we must restart lookup. 236fddc17deSEric Dumazet * We probably met an item that was moved to another chain. 237fddc17deSEric Dumazet */ 238fddc17deSEric Dumazet if (get_nulls_value(node) != slot2) 239fddc17deSEric Dumazet goto begin; 240fddc17deSEric Dumazet 241fddc17deSEric Dumazet if (result) { 242fddc17deSEric Dumazet exact_match: 243c31504dcSEric Dumazet if (unlikely(!atomic_inc_not_zero_hint(&result->sk_refcnt, 2))) 244fddc17deSEric Dumazet result = NULL; 245fddc17deSEric Dumazet else if (unlikely(compute_score2(result, net, saddr, sport, 246fddc17deSEric Dumazet daddr, hnum, dif) < badness)) { 247fddc17deSEric Dumazet sock_put(result); 248fddc17deSEric Dumazet goto begin; 249fddc17deSEric Dumazet } 250fddc17deSEric Dumazet } 251fddc17deSEric Dumazet return result; 252fddc17deSEric Dumazet } 253fddc17deSEric Dumazet 254fce82338SPavel Emelyanov struct sock *__udp6_lib_lookup(struct net *net, 25588440ae7SBalazs Scheidler const struct in6_addr *saddr, __be16 sport, 25688440ae7SBalazs Scheidler const struct in6_addr *daddr, __be16 dport, 257645ca708SEric Dumazet int dif, struct udp_table *udptable) 258645ca708SEric Dumazet { 259271b72c7SEric Dumazet struct sock *sk, *result; 26088ab1932SEric Dumazet struct hlist_nulls_node *node; 261645ca708SEric Dumazet unsigned short hnum = ntohs(dport); 262fddc17deSEric Dumazet unsigned int hash2, slot2, slot = udp_hashfn(net, hnum, udptable->mask); 263fddc17deSEric Dumazet struct udp_hslot *hslot2, *hslot = &udptable->hash[slot]; 26472289b96STom Herbert int score, badness, matches = 0, reuseport = 0; 26572289b96STom Herbert u32 hash = 0; 266645ca708SEric Dumazet 267271b72c7SEric Dumazet rcu_read_lock(); 268fddc17deSEric Dumazet if (hslot->count > 10) { 269fddc17deSEric Dumazet hash2 = udp6_portaddr_hash(net, daddr, hnum); 270fddc17deSEric Dumazet slot2 = hash2 & udptable->mask; 271fddc17deSEric Dumazet hslot2 = &udptable->hash2[slot2]; 272fddc17deSEric Dumazet if (hslot->count < hslot2->count) 273fddc17deSEric Dumazet goto begin; 274fddc17deSEric Dumazet 275fddc17deSEric Dumazet result = udp6_lib_lookup2(net, saddr, sport, 276fddc17deSEric Dumazet daddr, hnum, dif, 277fddc17deSEric Dumazet hslot2, slot2); 278fddc17deSEric Dumazet if (!result) { 279fddc17deSEric Dumazet hash2 = udp6_portaddr_hash(net, &in6addr_any, hnum); 280fddc17deSEric Dumazet slot2 = hash2 & udptable->mask; 281fddc17deSEric Dumazet hslot2 = &udptable->hash2[slot2]; 282fddc17deSEric Dumazet if (hslot->count < hslot2->count) 283fddc17deSEric Dumazet goto begin; 284fddc17deSEric Dumazet 2851223c67cSJorge Boncompte [DTI2] result = udp6_lib_lookup2(net, saddr, sport, 2861223c67cSJorge Boncompte [DTI2] &in6addr_any, hnum, dif, 287fddc17deSEric Dumazet hslot2, slot2); 288fddc17deSEric Dumazet } 289fddc17deSEric Dumazet rcu_read_unlock(); 290fddc17deSEric Dumazet return result; 291fddc17deSEric Dumazet } 292271b72c7SEric Dumazet begin: 293271b72c7SEric Dumazet result = NULL; 294271b72c7SEric Dumazet badness = -1; 29588ab1932SEric Dumazet sk_nulls_for_each_rcu(sk, node, &hslot->head) { 296645ca708SEric Dumazet score = compute_score(sk, net, hnum, saddr, sport, daddr, dport, dif); 297645ca708SEric Dumazet if (score > badness) { 298db8dac20SDavid S. Miller result = sk; 299db8dac20SDavid S. Miller badness = score; 30072289b96STom Herbert reuseport = sk->sk_reuseport; 30172289b96STom Herbert if (reuseport) { 30272289b96STom Herbert hash = inet6_ehashfn(net, daddr, hnum, 30372289b96STom Herbert saddr, sport); 30472289b96STom Herbert matches = 1; 30572289b96STom Herbert } 30672289b96STom Herbert } else if (score == badness && reuseport) { 30772289b96STom Herbert matches++; 30872289b96STom Herbert if (((u64)hash * matches) >> 32 == 0) 30972289b96STom Herbert result = sk; 31072289b96STom Herbert hash = next_pseudo_random32(hash); 311db8dac20SDavid S. Miller } 312db8dac20SDavid S. Miller } 31388ab1932SEric Dumazet /* 31488ab1932SEric Dumazet * if the nulls value we got at the end of this lookup is 31588ab1932SEric Dumazet * not the expected one, we must restart lookup. 31688ab1932SEric Dumazet * We probably met an item that was moved to another chain. 31788ab1932SEric Dumazet */ 318fddc17deSEric Dumazet if (get_nulls_value(node) != slot) 31988ab1932SEric Dumazet goto begin; 32088ab1932SEric Dumazet 321271b72c7SEric Dumazet if (result) { 322c31504dcSEric Dumazet if (unlikely(!atomic_inc_not_zero_hint(&result->sk_refcnt, 2))) 323271b72c7SEric Dumazet result = NULL; 324271b72c7SEric Dumazet else if (unlikely(compute_score(result, net, hnum, saddr, sport, 325271b72c7SEric Dumazet daddr, dport, dif) < badness)) { 326271b72c7SEric Dumazet sock_put(result); 327271b72c7SEric Dumazet goto begin; 328271b72c7SEric Dumazet } 329271b72c7SEric Dumazet } 330271b72c7SEric Dumazet rcu_read_unlock(); 331db8dac20SDavid S. Miller return result; 332db8dac20SDavid S. Miller } 333fce82338SPavel Emelyanov EXPORT_SYMBOL_GPL(__udp6_lib_lookup); 334db8dac20SDavid S. Miller 335607c4aafSKOVACS Krisztian static struct sock *__udp6_lib_lookup_skb(struct sk_buff *skb, 336607c4aafSKOVACS Krisztian __be16 sport, __be16 dport, 337645ca708SEric Dumazet struct udp_table *udptable) 338607c4aafSKOVACS Krisztian { 33923542618SKOVACS Krisztian struct sock *sk; 340b71d1d42SEric Dumazet const struct ipv6hdr *iph = ipv6_hdr(skb); 341607c4aafSKOVACS Krisztian 34223542618SKOVACS Krisztian if (unlikely(sk = skb_steal_sock(skb))) 34323542618SKOVACS Krisztian return sk; 344adf30907SEric Dumazet return __udp6_lib_lookup(dev_net(skb_dst(skb)->dev), &iph->saddr, sport, 345607c4aafSKOVACS Krisztian &iph->daddr, dport, inet6_iif(skb), 346607c4aafSKOVACS Krisztian udptable); 347607c4aafSKOVACS Krisztian } 348607c4aafSKOVACS Krisztian 349aa976fc0SBalazs Scheidler struct sock *udp6_lib_lookup(struct net *net, const struct in6_addr *saddr, __be16 sport, 350aa976fc0SBalazs Scheidler const struct in6_addr *daddr, __be16 dport, int dif) 351aa976fc0SBalazs Scheidler { 352aa976fc0SBalazs Scheidler return __udp6_lib_lookup(net, saddr, sport, daddr, dport, dif, &udp_table); 353aa976fc0SBalazs Scheidler } 354aa976fc0SBalazs Scheidler EXPORT_SYMBOL_GPL(udp6_lib_lookup); 355aa976fc0SBalazs Scheidler 356aa976fc0SBalazs Scheidler 357db8dac20SDavid S. Miller /* 358db8dac20SDavid S. Miller * This should be easy, if there is something there we 359db8dac20SDavid S. Miller * return it, otherwise we block. 360db8dac20SDavid S. Miller */ 361db8dac20SDavid S. Miller 362db8dac20SDavid S. Miller int udpv6_recvmsg(struct kiocb *iocb, struct sock *sk, 363db8dac20SDavid S. Miller struct msghdr *msg, size_t len, 364db8dac20SDavid S. Miller int noblock, int flags, int *addr_len) 365db8dac20SDavid S. Miller { 366db8dac20SDavid S. Miller struct ipv6_pinfo *np = inet6_sk(sk); 367db8dac20SDavid S. Miller struct inet_sock *inet = inet_sk(sk); 368db8dac20SDavid S. Miller struct sk_buff *skb; 36959c2cdaeSDavid S. Miller unsigned int ulen, copied; 3703f518bf7SPavel Emelyanov int peeked, off = 0; 371db8dac20SDavid S. Miller int err; 372db8dac20SDavid S. Miller int is_udplite = IS_UDPLITE(sk); 373f26ba175SWei Yongjun int is_udp4; 3748a74ad60SEric Dumazet bool slow; 375db8dac20SDavid S. Miller 376db8dac20SDavid S. Miller if (addr_len) 377db8dac20SDavid S. Miller *addr_len = sizeof(struct sockaddr_in6); 378db8dac20SDavid S. Miller 379db8dac20SDavid S. Miller if (flags & MSG_ERRQUEUE) 380db8dac20SDavid S. Miller return ipv6_recv_error(sk, msg, len); 381db8dac20SDavid S. Miller 3824b340ae2SBrian Haley if (np->rxpmtu && np->rxopt.bits.rxpmtu) 3834b340ae2SBrian Haley return ipv6_recv_rxpmtu(sk, msg, len); 3844b340ae2SBrian Haley 385db8dac20SDavid S. Miller try_again: 386db8dac20SDavid S. Miller skb = __skb_recv_datagram(sk, flags | (noblock ? MSG_DONTWAIT : 0), 3873f518bf7SPavel Emelyanov &peeked, &off, &err); 388db8dac20SDavid S. Miller if (!skb) 389db8dac20SDavid S. Miller goto out; 390db8dac20SDavid S. Miller 391db8dac20SDavid S. Miller ulen = skb->len - sizeof(struct udphdr); 39259c2cdaeSDavid S. Miller copied = len; 39359c2cdaeSDavid S. Miller if (copied > ulen) 39459c2cdaeSDavid S. Miller copied = ulen; 39559c2cdaeSDavid S. Miller else if (copied < ulen) 396db8dac20SDavid S. Miller msg->msg_flags |= MSG_TRUNC; 397db8dac20SDavid S. Miller 398f26ba175SWei Yongjun is_udp4 = (skb->protocol == htons(ETH_P_IP)); 399f26ba175SWei Yongjun 400db8dac20SDavid S. Miller /* 401db8dac20SDavid S. Miller * If checksum is needed at all, try to do it while copying the 402db8dac20SDavid S. Miller * data. If the data is truncated, or if we only want a partial 403db8dac20SDavid S. Miller * coverage checksum (UDP-Lite), do it before the copy. 404db8dac20SDavid S. Miller */ 405db8dac20SDavid S. Miller 40659c2cdaeSDavid S. Miller if (copied < ulen || UDP_SKB_CB(skb)->partial_cov) { 407db8dac20SDavid S. Miller if (udp_lib_checksum_complete(skb)) 408db8dac20SDavid S. Miller goto csum_copy_err; 409db8dac20SDavid S. Miller } 410db8dac20SDavid S. Miller 411db8dac20SDavid S. Miller if (skb_csum_unnecessary(skb)) 412db8dac20SDavid S. Miller err = skb_copy_datagram_iovec(skb, sizeof(struct udphdr), 41359c2cdaeSDavid S. Miller msg->msg_iov, copied); 414db8dac20SDavid S. Miller else { 415db8dac20SDavid S. Miller err = skb_copy_and_csum_datagram_iovec(skb, sizeof(struct udphdr), msg->msg_iov); 416db8dac20SDavid S. Miller if (err == -EINVAL) 417db8dac20SDavid S. Miller goto csum_copy_err; 418db8dac20SDavid S. Miller } 41922911fc5SEric Dumazet if (unlikely(err)) { 42022911fc5SEric Dumazet trace_kfree_skb(skb, udpv6_recvmsg); 421979402b1SEric Dumazet if (!peeked) { 422979402b1SEric Dumazet atomic_inc(&sk->sk_drops); 423979402b1SEric Dumazet if (is_udp4) 424979402b1SEric Dumazet UDP_INC_STATS_USER(sock_net(sk), 425979402b1SEric Dumazet UDP_MIB_INERRORS, 426979402b1SEric Dumazet is_udplite); 427979402b1SEric Dumazet else 428979402b1SEric Dumazet UDP6_INC_STATS_USER(sock_net(sk), 429979402b1SEric Dumazet UDP_MIB_INERRORS, 430979402b1SEric Dumazet is_udplite); 431979402b1SEric Dumazet } 432db8dac20SDavid S. Miller goto out_free; 43322911fc5SEric Dumazet } 434f26ba175SWei Yongjun if (!peeked) { 435f26ba175SWei Yongjun if (is_udp4) 436f26ba175SWei Yongjun UDP_INC_STATS_USER(sock_net(sk), 437f26ba175SWei Yongjun UDP_MIB_INDATAGRAMS, is_udplite); 438f26ba175SWei Yongjun else 439235b9f7aSPavel Emelyanov UDP6_INC_STATS_USER(sock_net(sk), 440235b9f7aSPavel Emelyanov UDP_MIB_INDATAGRAMS, is_udplite); 441f26ba175SWei Yongjun } 442db8dac20SDavid S. Miller 4433b885787SNeil Horman sock_recv_ts_and_drops(msg, sk, skb); 444db8dac20SDavid S. Miller 445db8dac20SDavid S. Miller /* Copy the address. */ 446db8dac20SDavid S. Miller if (msg->msg_name) { 447db8dac20SDavid S. Miller struct sockaddr_in6 *sin6; 448db8dac20SDavid S. Miller 449db8dac20SDavid S. Miller sin6 = (struct sockaddr_in6 *) msg->msg_name; 450db8dac20SDavid S. Miller sin6->sin6_family = AF_INET6; 451db8dac20SDavid S. Miller sin6->sin6_port = udp_hdr(skb)->source; 452db8dac20SDavid S. Miller sin6->sin6_flowinfo = 0; 453db8dac20SDavid S. Miller 454842df073SHannes Frederic Sowa if (is_udp4) { 455b301e82cSBrian Haley ipv6_addr_set_v4mapped(ip_hdr(skb)->saddr, 456b301e82cSBrian Haley &sin6->sin6_addr); 457842df073SHannes Frederic Sowa sin6->sin6_scope_id = 0; 458842df073SHannes Frederic Sowa } else { 4594e3fd7a0SAlexey Dobriyan sin6->sin6_addr = ipv6_hdr(skb)->saddr; 460842df073SHannes Frederic Sowa sin6->sin6_scope_id = 461842df073SHannes Frederic Sowa ipv6_iface_scope_id(&sin6->sin6_addr, 462842df073SHannes Frederic Sowa IP6CB(skb)->iif); 463db8dac20SDavid S. Miller } 464db8dac20SDavid S. Miller 465db8dac20SDavid S. Miller } 466f26ba175SWei Yongjun if (is_udp4) { 467db8dac20SDavid S. Miller if (inet->cmsg_flags) 468db8dac20SDavid S. Miller ip_cmsg_recv(msg, skb); 469db8dac20SDavid S. Miller } else { 470db8dac20SDavid S. Miller if (np->rxopt.all) 47173df66f8STom Parkin ip6_datagram_recv_ctl(sk, msg, skb); 472db8dac20SDavid S. Miller } 473db8dac20SDavid S. Miller 47459c2cdaeSDavid S. Miller err = copied; 475db8dac20SDavid S. Miller if (flags & MSG_TRUNC) 476db8dac20SDavid S. Miller err = ulen; 477db8dac20SDavid S. Miller 478db8dac20SDavid S. Miller out_free: 4799d410c79SEric Dumazet skb_free_datagram_locked(sk, skb); 480db8dac20SDavid S. Miller out: 481db8dac20SDavid S. Miller return err; 482db8dac20SDavid S. Miller 483db8dac20SDavid S. Miller csum_copy_err: 4848a74ad60SEric Dumazet slow = lock_sock_fast(sk); 4850856f939SWei Yongjun if (!skb_kill_datagram(sk, skb, flags)) { 4866a5dc9e5SEric Dumazet if (is_udp4) { 4876a5dc9e5SEric Dumazet UDP_INC_STATS_USER(sock_net(sk), 4886a5dc9e5SEric Dumazet UDP_MIB_CSUMERRORS, is_udplite); 4890856f939SWei Yongjun UDP_INC_STATS_USER(sock_net(sk), 4900856f939SWei Yongjun UDP_MIB_INERRORS, is_udplite); 4916a5dc9e5SEric Dumazet } else { 4926a5dc9e5SEric Dumazet UDP6_INC_STATS_USER(sock_net(sk), 4936a5dc9e5SEric Dumazet UDP_MIB_CSUMERRORS, is_udplite); 4940856f939SWei Yongjun UDP6_INC_STATS_USER(sock_net(sk), 4950856f939SWei Yongjun UDP_MIB_INERRORS, is_udplite); 4960856f939SWei Yongjun } 4976a5dc9e5SEric Dumazet } 4988a74ad60SEric Dumazet unlock_sock_fast(sk, slow); 499db8dac20SDavid S. Miller 50032c90254SXufeng Zhang if (noblock) 501db8dac20SDavid S. Miller return -EAGAIN; 5029cfaa8deSXufeng Zhang 5039cfaa8deSXufeng Zhang /* starting over for a new packet */ 5049cfaa8deSXufeng Zhang msg->msg_flags &= ~MSG_TRUNC; 505db8dac20SDavid S. Miller goto try_again; 506db8dac20SDavid S. Miller } 507db8dac20SDavid S. Miller 508db8dac20SDavid S. Miller void __udp6_lib_err(struct sk_buff *skb, struct inet6_skb_parm *opt, 509d5fdd6baSBrian Haley u8 type, u8 code, int offset, __be32 info, 510645ca708SEric Dumazet struct udp_table *udptable) 511db8dac20SDavid S. Miller { 512db8dac20SDavid S. Miller struct ipv6_pinfo *np; 513b71d1d42SEric Dumazet const struct ipv6hdr *hdr = (const struct ipv6hdr *)skb->data; 514b71d1d42SEric Dumazet const struct in6_addr *saddr = &hdr->saddr; 515b71d1d42SEric Dumazet const struct in6_addr *daddr = &hdr->daddr; 516db8dac20SDavid S. Miller struct udphdr *uh = (struct udphdr*)(skb->data+offset); 517db8dac20SDavid S. Miller struct sock *sk; 518db8dac20SDavid S. Miller int err; 519db8dac20SDavid S. Miller 520c346dca1SYOSHIFUJI Hideaki sk = __udp6_lib_lookup(dev_net(skb->dev), daddr, uh->dest, 521db8dac20SDavid S. Miller saddr, uh->source, inet6_iif(skb), udptable); 522db8dac20SDavid S. Miller if (sk == NULL) 523db8dac20SDavid S. Miller return; 524db8dac20SDavid S. Miller 52581aded24SDavid S. Miller if (type == ICMPV6_PKT_TOOBIG) 52681aded24SDavid S. Miller ip6_sk_update_pmtu(skb, sk, info); 527ec18d9a2SDavid S. Miller if (type == NDISC_REDIRECT) 528ec18d9a2SDavid S. Miller ip6_sk_redirect(skb, sk); 52981aded24SDavid S. Miller 530db8dac20SDavid S. Miller np = inet6_sk(sk); 531db8dac20SDavid S. Miller 532db8dac20SDavid S. Miller if (!icmpv6_err_convert(type, code, &err) && !np->recverr) 533db8dac20SDavid S. Miller goto out; 534db8dac20SDavid S. Miller 535db8dac20SDavid S. Miller if (sk->sk_state != TCP_ESTABLISHED && !np->recverr) 536db8dac20SDavid S. Miller goto out; 537db8dac20SDavid S. Miller 538b1faf566SEric Dumazet if (np->recverr) 539db8dac20SDavid S. Miller ipv6_icmp_error(sk, skb, err, uh->dest, ntohl(info), (u8 *)(uh+1)); 540b1faf566SEric Dumazet 541db8dac20SDavid S. Miller sk->sk_err = err; 542db8dac20SDavid S. Miller sk->sk_error_report(sk); 543db8dac20SDavid S. Miller out: 544db8dac20SDavid S. Miller sock_put(sk); 545db8dac20SDavid S. Miller } 546db8dac20SDavid S. Miller 547f7ad74feSBenjamin LaHaise static int __udpv6_queue_rcv_skb(struct sock *sk, struct sk_buff *skb) 548f7ad74feSBenjamin LaHaise { 549f7ad74feSBenjamin LaHaise int rc; 550f7ad74feSBenjamin LaHaise 551f7ad74feSBenjamin LaHaise if (!ipv6_addr_any(&inet6_sk(sk)->daddr)) 552f7ad74feSBenjamin LaHaise sock_rps_save_rxhash(sk, skb); 553f7ad74feSBenjamin LaHaise 554f7ad74feSBenjamin LaHaise rc = sock_queue_rcv_skb(sk, skb); 555f7ad74feSBenjamin LaHaise if (rc < 0) { 556f7ad74feSBenjamin LaHaise int is_udplite = IS_UDPLITE(sk); 557f7ad74feSBenjamin LaHaise 558f7ad74feSBenjamin LaHaise /* Note that an ENOMEM error is charged twice */ 559f7ad74feSBenjamin LaHaise if (rc == -ENOMEM) 560f7ad74feSBenjamin LaHaise UDP6_INC_STATS_BH(sock_net(sk), 561f7ad74feSBenjamin LaHaise UDP_MIB_RCVBUFERRORS, is_udplite); 562f7ad74feSBenjamin LaHaise UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_INERRORS, is_udplite); 563f7ad74feSBenjamin LaHaise kfree_skb(skb); 564f7ad74feSBenjamin LaHaise return -1; 565f7ad74feSBenjamin LaHaise } 566f7ad74feSBenjamin LaHaise return 0; 567f7ad74feSBenjamin LaHaise } 568f7ad74feSBenjamin LaHaise 569db8dac20SDavid S. Miller static __inline__ void udpv6_err(struct sk_buff *skb, 570d5fdd6baSBrian Haley struct inet6_skb_parm *opt, u8 type, 571d5fdd6baSBrian Haley u8 code, int offset, __be32 info ) 572db8dac20SDavid S. Miller { 573645ca708SEric Dumazet __udp6_lib_err(skb, opt, type, code, offset, info, &udp_table); 574db8dac20SDavid S. Miller } 575db8dac20SDavid S. Miller 576d7f3f621SBenjamin LaHaise static struct static_key udpv6_encap_needed __read_mostly; 577d7f3f621SBenjamin LaHaise void udpv6_encap_enable(void) 578d7f3f621SBenjamin LaHaise { 579d7f3f621SBenjamin LaHaise if (!static_key_enabled(&udpv6_encap_needed)) 580d7f3f621SBenjamin LaHaise static_key_slow_inc(&udpv6_encap_needed); 581d7f3f621SBenjamin LaHaise } 582d7f3f621SBenjamin LaHaise EXPORT_SYMBOL(udpv6_encap_enable); 583d7f3f621SBenjamin LaHaise 584db8dac20SDavid S. Miller int udpv6_queue_rcv_skb(struct sock *sk, struct sk_buff *skb) 585db8dac20SDavid S. Miller { 586db8dac20SDavid S. Miller struct udp_sock *up = udp_sk(sk); 587db8dac20SDavid S. Miller int rc; 588db8dac20SDavid S. Miller int is_udplite = IS_UDPLITE(sk); 589db8dac20SDavid S. Miller 590db8dac20SDavid S. Miller if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb)) 591db8dac20SDavid S. Miller goto drop; 592db8dac20SDavid S. Miller 593d7f3f621SBenjamin LaHaise if (static_key_false(&udpv6_encap_needed) && up->encap_type) { 594d7f3f621SBenjamin LaHaise int (*encap_rcv)(struct sock *sk, struct sk_buff *skb); 595d7f3f621SBenjamin LaHaise 596d7f3f621SBenjamin LaHaise /* 597d7f3f621SBenjamin LaHaise * This is an encapsulation socket so pass the skb to 598d7f3f621SBenjamin LaHaise * the socket's udp_encap_rcv() hook. Otherwise, just 599d7f3f621SBenjamin LaHaise * fall through and pass this up the UDP socket. 600d7f3f621SBenjamin LaHaise * up->encap_rcv() returns the following value: 601d7f3f621SBenjamin LaHaise * =0 if skb was successfully passed to the encap 602d7f3f621SBenjamin LaHaise * handler or was discarded by it. 603d7f3f621SBenjamin LaHaise * >0 if skb should be passed on to UDP. 604d7f3f621SBenjamin LaHaise * <0 if skb should be resubmitted as proto -N 605d7f3f621SBenjamin LaHaise */ 606d7f3f621SBenjamin LaHaise 607d7f3f621SBenjamin LaHaise /* if we're overly short, let UDP handle it */ 608d7f3f621SBenjamin LaHaise encap_rcv = ACCESS_ONCE(up->encap_rcv); 609d7f3f621SBenjamin LaHaise if (skb->len > sizeof(struct udphdr) && encap_rcv != NULL) { 610d7f3f621SBenjamin LaHaise int ret; 611d7f3f621SBenjamin LaHaise 612d7f3f621SBenjamin LaHaise ret = encap_rcv(sk, skb); 613d7f3f621SBenjamin LaHaise if (ret <= 0) { 614d7f3f621SBenjamin LaHaise UDP_INC_STATS_BH(sock_net(sk), 615d7f3f621SBenjamin LaHaise UDP_MIB_INDATAGRAMS, 616d7f3f621SBenjamin LaHaise is_udplite); 617d7f3f621SBenjamin LaHaise return -ret; 618d7f3f621SBenjamin LaHaise } 619d7f3f621SBenjamin LaHaise } 620d7f3f621SBenjamin LaHaise 621d7f3f621SBenjamin LaHaise /* FALLTHROUGH -- it's a UDP Packet */ 622d7f3f621SBenjamin LaHaise } 623d7f3f621SBenjamin LaHaise 624db8dac20SDavid S. Miller /* 625db8dac20SDavid S. Miller * UDP-Lite specific tests, ignored on UDP sockets (see net/ipv4/udp.c). 626db8dac20SDavid S. Miller */ 627db8dac20SDavid S. Miller if ((is_udplite & UDPLITE_RECV_CC) && UDP_SKB_CB(skb)->partial_cov) { 628db8dac20SDavid S. Miller 629db8dac20SDavid S. Miller if (up->pcrlen == 0) { /* full coverage was set */ 630db8dac20SDavid S. Miller LIMIT_NETDEBUG(KERN_WARNING "UDPLITE6: partial coverage" 631db8dac20SDavid S. Miller " %d while full coverage %d requested\n", 632db8dac20SDavid S. Miller UDP_SKB_CB(skb)->cscov, skb->len); 633db8dac20SDavid S. Miller goto drop; 634db8dac20SDavid S. Miller } 635db8dac20SDavid S. Miller if (UDP_SKB_CB(skb)->cscov < up->pcrlen) { 636db8dac20SDavid S. Miller LIMIT_NETDEBUG(KERN_WARNING "UDPLITE6: coverage %d " 637db8dac20SDavid S. Miller "too small, need min %d\n", 638db8dac20SDavid S. Miller UDP_SKB_CB(skb)->cscov, up->pcrlen); 639db8dac20SDavid S. Miller goto drop; 640db8dac20SDavid S. Miller } 641db8dac20SDavid S. Miller } 642db8dac20SDavid S. Miller 64333d480ceSEric Dumazet if (rcu_access_pointer(sk->sk_filter)) { 644db8dac20SDavid S. Miller if (udp_lib_checksum_complete(skb)) 6456a5dc9e5SEric Dumazet goto csum_error; 646db8dac20SDavid S. Miller } 647db8dac20SDavid S. Miller 648cb80ef46SBenjamin LaHaise if (sk_rcvqueues_full(sk, skb, sk->sk_rcvbuf)) 649cb80ef46SBenjamin LaHaise goto drop; 650cb80ef46SBenjamin LaHaise 651d826eb14SEric Dumazet skb_dst_drop(skb); 652db8dac20SDavid S. Miller 653cb80ef46SBenjamin LaHaise bh_lock_sock(sk); 654cb80ef46SBenjamin LaHaise rc = 0; 655cb80ef46SBenjamin LaHaise if (!sock_owned_by_user(sk)) 656f7ad74feSBenjamin LaHaise rc = __udpv6_queue_rcv_skb(sk, skb); 657cb80ef46SBenjamin LaHaise else if (sk_add_backlog(sk, skb, sk->sk_rcvbuf)) { 658cb80ef46SBenjamin LaHaise bh_unlock_sock(sk); 659cb80ef46SBenjamin LaHaise goto drop; 660cb80ef46SBenjamin LaHaise } 661cb80ef46SBenjamin LaHaise bh_unlock_sock(sk); 662f7ad74feSBenjamin LaHaise 663f7ad74feSBenjamin LaHaise return rc; 6646a5dc9e5SEric Dumazet csum_error: 6656a5dc9e5SEric Dumazet UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_CSUMERRORS, is_udplite); 666db8dac20SDavid S. Miller drop: 667ef28d1a2SPavel Emelyanov UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_INERRORS, is_udplite); 668cb80ef46SBenjamin LaHaise atomic_inc(&sk->sk_drops); 669db8dac20SDavid S. Miller kfree_skb(skb); 670db8dac20SDavid S. Miller return -1; 671db8dac20SDavid S. Miller } 672db8dac20SDavid S. Miller 673920a4611SEric Dumazet static struct sock *udp_v6_mcast_next(struct net *net, struct sock *sk, 674b71d1d42SEric Dumazet __be16 loc_port, const struct in6_addr *loc_addr, 675b71d1d42SEric Dumazet __be16 rmt_port, const struct in6_addr *rmt_addr, 676db8dac20SDavid S. Miller int dif) 677db8dac20SDavid S. Miller { 67888ab1932SEric Dumazet struct hlist_nulls_node *node; 679db8dac20SDavid S. Miller struct sock *s = sk; 680db8dac20SDavid S. Miller unsigned short num = ntohs(loc_port); 681db8dac20SDavid S. Miller 68288ab1932SEric Dumazet sk_nulls_for_each_from(s, node) { 683db8dac20SDavid S. Miller struct inet_sock *inet = inet_sk(s); 684db8dac20SDavid S. Miller 685920a4611SEric Dumazet if (!net_eq(sock_net(s), net)) 686b8ad0cbcSDaniel Lezcano continue; 687b8ad0cbcSDaniel Lezcano 688d4cada4aSEric Dumazet if (udp_sk(s)->udp_port_hash == num && 689d4cada4aSEric Dumazet s->sk_family == PF_INET6) { 690db8dac20SDavid S. Miller struct ipv6_pinfo *np = inet6_sk(s); 691c720c7e8SEric Dumazet if (inet->inet_dport) { 692c720c7e8SEric Dumazet if (inet->inet_dport != rmt_port) 693db8dac20SDavid S. Miller continue; 694db8dac20SDavid S. Miller } 695db8dac20SDavid S. Miller if (!ipv6_addr_any(&np->daddr) && 696db8dac20SDavid S. Miller !ipv6_addr_equal(&np->daddr, rmt_addr)) 697db8dac20SDavid S. Miller continue; 698db8dac20SDavid S. Miller 699db8dac20SDavid S. Miller if (s->sk_bound_dev_if && s->sk_bound_dev_if != dif) 700db8dac20SDavid S. Miller continue; 701db8dac20SDavid S. Miller 702db8dac20SDavid S. Miller if (!ipv6_addr_any(&np->rcv_saddr)) { 703db8dac20SDavid S. Miller if (!ipv6_addr_equal(&np->rcv_saddr, loc_addr)) 704db8dac20SDavid S. Miller continue; 705db8dac20SDavid S. Miller } 706db8dac20SDavid S. Miller if (!inet6_mc_check(s, loc_addr, rmt_addr)) 707db8dac20SDavid S. Miller continue; 708db8dac20SDavid S. Miller return s; 709db8dac20SDavid S. Miller } 710db8dac20SDavid S. Miller } 711db8dac20SDavid S. Miller return NULL; 712db8dac20SDavid S. Miller } 713db8dac20SDavid S. Miller 714a1ab77f9SEric Dumazet static void flush_stack(struct sock **stack, unsigned int count, 715a1ab77f9SEric Dumazet struct sk_buff *skb, unsigned int final) 716a1ab77f9SEric Dumazet { 717cb80ef46SBenjamin LaHaise struct sk_buff *skb1 = NULL; 718a1ab77f9SEric Dumazet struct sock *sk; 719cb80ef46SBenjamin LaHaise unsigned int i; 720a1ab77f9SEric Dumazet 721a1ab77f9SEric Dumazet for (i = 0; i < count; i++) { 722a1ab77f9SEric Dumazet sk = stack[i]; 723cb80ef46SBenjamin LaHaise if (likely(skb1 == NULL)) 724cb80ef46SBenjamin LaHaise skb1 = (i == final) ? skb : skb_clone(skb, GFP_ATOMIC); 725cb80ef46SBenjamin LaHaise if (!skb1) { 726f6b8f32cSEric Dumazet atomic_inc(&sk->sk_drops); 727cb80ef46SBenjamin LaHaise UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_RCVBUFERRORS, 728cb80ef46SBenjamin LaHaise IS_UDPLITE(sk)); 729cb80ef46SBenjamin LaHaise UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_INERRORS, 730cb80ef46SBenjamin LaHaise IS_UDPLITE(sk)); 731a1ab77f9SEric Dumazet } 732cb80ef46SBenjamin LaHaise 733cb80ef46SBenjamin LaHaise if (skb1 && udpv6_queue_rcv_skb(sk, skb1) <= 0) 734cb80ef46SBenjamin LaHaise skb1 = NULL; 735cb80ef46SBenjamin LaHaise } 736cb80ef46SBenjamin LaHaise if (unlikely(skb1)) 737cb80ef46SBenjamin LaHaise kfree_skb(skb1); 738a1ab77f9SEric Dumazet } 739db8dac20SDavid S. Miller /* 740db8dac20SDavid S. Miller * Note: called only from the BH handler context, 741db8dac20SDavid S. Miller * so we don't need to lock the hashes. 742db8dac20SDavid S. Miller */ 743e3163493SPavel Emelyanov static int __udp6_lib_mcast_deliver(struct net *net, struct sk_buff *skb, 744b71d1d42SEric Dumazet const struct in6_addr *saddr, const struct in6_addr *daddr, 745645ca708SEric Dumazet struct udp_table *udptable) 746db8dac20SDavid S. Miller { 747a1ab77f9SEric Dumazet struct sock *sk, *stack[256 / sizeof(struct sock *)]; 748db8dac20SDavid S. Miller const struct udphdr *uh = udp_hdr(skb); 749f86dcc5aSEric Dumazet struct udp_hslot *hslot = udp_hashslot(udptable, net, ntohs(uh->dest)); 750db8dac20SDavid S. Miller int dif; 751a1ab77f9SEric Dumazet unsigned int i, count = 0; 752db8dac20SDavid S. Miller 753645ca708SEric Dumazet spin_lock(&hslot->lock); 75488ab1932SEric Dumazet sk = sk_nulls_head(&hslot->head); 755db8dac20SDavid S. Miller dif = inet6_iif(skb); 756920a4611SEric Dumazet sk = udp_v6_mcast_next(net, sk, uh->dest, daddr, uh->source, saddr, dif); 757a1ab77f9SEric Dumazet while (sk) { 758a1ab77f9SEric Dumazet stack[count++] = sk; 759a1ab77f9SEric Dumazet sk = udp_v6_mcast_next(net, sk_nulls_next(sk), uh->dest, daddr, 760a1ab77f9SEric Dumazet uh->source, saddr, dif); 761a1ab77f9SEric Dumazet if (unlikely(count == ARRAY_SIZE(stack))) { 762a1ab77f9SEric Dumazet if (!sk) 763a1ab77f9SEric Dumazet break; 764a1ab77f9SEric Dumazet flush_stack(stack, count, skb, ~0); 765a1ab77f9SEric Dumazet count = 0; 766db8dac20SDavid S. Miller } 767a1ab77f9SEric Dumazet } 768a1ab77f9SEric Dumazet /* 769a1ab77f9SEric Dumazet * before releasing the lock, we must take reference on sockets 770a1ab77f9SEric Dumazet */ 771a1ab77f9SEric Dumazet for (i = 0; i < count; i++) 772a1ab77f9SEric Dumazet sock_hold(stack[i]); 773db8dac20SDavid S. Miller 774645ca708SEric Dumazet spin_unlock(&hslot->lock); 775a1ab77f9SEric Dumazet 776a1ab77f9SEric Dumazet if (count) { 777a1ab77f9SEric Dumazet flush_stack(stack, count, skb, count - 1); 778a1ab77f9SEric Dumazet 779a1ab77f9SEric Dumazet for (i = 0; i < count; i++) 780a1ab77f9SEric Dumazet sock_put(stack[i]); 781a1ab77f9SEric Dumazet } else { 782a1ab77f9SEric Dumazet kfree_skb(skb); 783a1ab77f9SEric Dumazet } 784db8dac20SDavid S. Miller return 0; 785db8dac20SDavid S. Miller } 786db8dac20SDavid S. Miller 787645ca708SEric Dumazet int __udp6_lib_rcv(struct sk_buff *skb, struct udp_table *udptable, 788db8dac20SDavid S. Miller int proto) 789db8dac20SDavid S. Miller { 7903ffe533cSAlexey Dobriyan struct net *net = dev_net(skb->dev); 791db8dac20SDavid S. Miller struct sock *sk; 792db8dac20SDavid S. Miller struct udphdr *uh; 793b71d1d42SEric Dumazet const struct in6_addr *saddr, *daddr; 794db8dac20SDavid S. Miller u32 ulen = 0; 795db8dac20SDavid S. Miller 796db8dac20SDavid S. Miller if (!pskb_may_pull(skb, sizeof(struct udphdr))) 797d6bc0149SBjørn Mork goto discard; 798db8dac20SDavid S. Miller 799db8dac20SDavid S. Miller saddr = &ipv6_hdr(skb)->saddr; 800db8dac20SDavid S. Miller daddr = &ipv6_hdr(skb)->daddr; 801db8dac20SDavid S. Miller uh = udp_hdr(skb); 802db8dac20SDavid S. Miller 803db8dac20SDavid S. Miller ulen = ntohs(uh->len); 804db8dac20SDavid S. Miller if (ulen > skb->len) 805db8dac20SDavid S. Miller goto short_packet; 806db8dac20SDavid S. Miller 807db8dac20SDavid S. Miller if (proto == IPPROTO_UDP) { 808db8dac20SDavid S. Miller /* UDP validates ulen. */ 809db8dac20SDavid S. Miller 810db8dac20SDavid S. Miller /* Check for jumbo payload */ 811db8dac20SDavid S. Miller if (ulen == 0) 812db8dac20SDavid S. Miller ulen = skb->len; 813db8dac20SDavid S. Miller 814db8dac20SDavid S. Miller if (ulen < sizeof(*uh)) 815db8dac20SDavid S. Miller goto short_packet; 816db8dac20SDavid S. Miller 817db8dac20SDavid S. Miller if (ulen < skb->len) { 818db8dac20SDavid S. Miller if (pskb_trim_rcsum(skb, ulen)) 819db8dac20SDavid S. Miller goto short_packet; 820db8dac20SDavid S. Miller saddr = &ipv6_hdr(skb)->saddr; 821db8dac20SDavid S. Miller daddr = &ipv6_hdr(skb)->daddr; 822db8dac20SDavid S. Miller uh = udp_hdr(skb); 823db8dac20SDavid S. Miller } 824db8dac20SDavid S. Miller } 825db8dac20SDavid S. Miller 826db8dac20SDavid S. Miller if (udp6_csum_init(skb, uh, proto)) 8276a5dc9e5SEric Dumazet goto csum_error; 828db8dac20SDavid S. Miller 829db8dac20SDavid S. Miller /* 830db8dac20SDavid S. Miller * Multicast receive code 831db8dac20SDavid S. Miller */ 832db8dac20SDavid S. Miller if (ipv6_addr_is_multicast(daddr)) 833e3163493SPavel Emelyanov return __udp6_lib_mcast_deliver(net, skb, 834e3163493SPavel Emelyanov saddr, daddr, udptable); 835db8dac20SDavid S. Miller 836db8dac20SDavid S. Miller /* Unicast */ 837db8dac20SDavid S. Miller 838db8dac20SDavid S. Miller /* 839db8dac20SDavid S. Miller * check socket cache ... must talk to Alan about his plans 840db8dac20SDavid S. Miller * for sock caches... i'll skip this for now. 841db8dac20SDavid S. Miller */ 842607c4aafSKOVACS Krisztian sk = __udp6_lib_lookup_skb(skb, uh->source, uh->dest, udptable); 843cb80ef46SBenjamin LaHaise if (sk != NULL) { 844cb80ef46SBenjamin LaHaise int ret = udpv6_queue_rcv_skb(sk, skb); 845cb80ef46SBenjamin LaHaise sock_put(sk); 846db8dac20SDavid S. Miller 847cb80ef46SBenjamin LaHaise /* a return value > 0 means to resubmit the input, but 848cb80ef46SBenjamin LaHaise * it wants the return to be -protocol, or 0 849cb80ef46SBenjamin LaHaise */ 850cb80ef46SBenjamin LaHaise if (ret > 0) 851cb80ef46SBenjamin LaHaise return -ret; 852cb80ef46SBenjamin LaHaise 853cb80ef46SBenjamin LaHaise return 0; 854cb80ef46SBenjamin LaHaise } 855cb80ef46SBenjamin LaHaise 856db8dac20SDavid S. Miller if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) 857db8dac20SDavid S. Miller goto discard; 858db8dac20SDavid S. Miller 859db8dac20SDavid S. Miller if (udp_lib_checksum_complete(skb)) 8606a5dc9e5SEric Dumazet goto csum_error; 861db8dac20SDavid S. Miller 862cb80ef46SBenjamin LaHaise UDP6_INC_STATS_BH(net, UDP_MIB_NOPORTS, proto == IPPROTO_UDPLITE); 8633ffe533cSAlexey Dobriyan icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0); 864db8dac20SDavid S. Miller 865db8dac20SDavid S. Miller kfree_skb(skb); 866db8dac20SDavid S. Miller return 0; 867db8dac20SDavid S. Miller 868db8dac20SDavid S. Miller short_packet: 869d6bc0149SBjørn Mork LIMIT_NETDEBUG(KERN_DEBUG "UDP%sv6: short packet: From [%pI6c]:%u %d/%d to [%pI6c]:%u\n", 870db8dac20SDavid S. Miller proto == IPPROTO_UDPLITE ? "-Lite" : "", 871d6bc0149SBjørn Mork saddr, 872d6bc0149SBjørn Mork ntohs(uh->source), 873d6bc0149SBjørn Mork ulen, 874d6bc0149SBjørn Mork skb->len, 875d6bc0149SBjørn Mork daddr, 876d6bc0149SBjørn Mork ntohs(uh->dest)); 8776a5dc9e5SEric Dumazet goto discard; 8786a5dc9e5SEric Dumazet csum_error: 8796a5dc9e5SEric Dumazet UDP6_INC_STATS_BH(net, UDP_MIB_CSUMERRORS, proto == IPPROTO_UDPLITE); 880db8dac20SDavid S. Miller discard: 881ef28d1a2SPavel Emelyanov UDP6_INC_STATS_BH(net, UDP_MIB_INERRORS, proto == IPPROTO_UDPLITE); 882db8dac20SDavid S. Miller kfree_skb(skb); 883db8dac20SDavid S. Miller return 0; 884db8dac20SDavid S. Miller } 885db8dac20SDavid S. Miller 886db8dac20SDavid S. Miller static __inline__ int udpv6_rcv(struct sk_buff *skb) 887db8dac20SDavid S. Miller { 888645ca708SEric Dumazet return __udp6_lib_rcv(skb, &udp_table, IPPROTO_UDP); 889db8dac20SDavid S. Miller } 890db8dac20SDavid S. Miller 891db8dac20SDavid S. Miller /* 892db8dac20SDavid S. Miller * Throw away all pending data and cancel the corking. Socket is locked. 893db8dac20SDavid S. Miller */ 894db8dac20SDavid S. Miller static void udp_v6_flush_pending_frames(struct sock *sk) 895db8dac20SDavid S. Miller { 896db8dac20SDavid S. Miller struct udp_sock *up = udp_sk(sk); 897db8dac20SDavid S. Miller 89836d926b9SDenis V. Lunev if (up->pending == AF_INET) 89936d926b9SDenis V. Lunev udp_flush_pending_frames(sk); 90036d926b9SDenis V. Lunev else if (up->pending) { 901db8dac20SDavid S. Miller up->len = 0; 902db8dac20SDavid S. Miller up->pending = 0; 903db8dac20SDavid S. Miller ip6_flush_pending_frames(sk); 904db8dac20SDavid S. Miller } 905db8dac20SDavid S. Miller } 906db8dac20SDavid S. Miller 907493c6be3SSridhar Samudrala /** 908493c6be3SSridhar Samudrala * udp6_hwcsum_outgoing - handle outgoing HW checksumming 909493c6be3SSridhar Samudrala * @sk: socket we are sending on 910493c6be3SSridhar Samudrala * @skb: sk_buff containing the filled-in UDP header 911493c6be3SSridhar Samudrala * (checksum field must be zeroed out) 912493c6be3SSridhar Samudrala */ 913493c6be3SSridhar Samudrala static void udp6_hwcsum_outgoing(struct sock *sk, struct sk_buff *skb, 914493c6be3SSridhar Samudrala const struct in6_addr *saddr, 915493c6be3SSridhar Samudrala const struct in6_addr *daddr, int len) 916493c6be3SSridhar Samudrala { 917493c6be3SSridhar Samudrala unsigned int offset; 918493c6be3SSridhar Samudrala struct udphdr *uh = udp_hdr(skb); 919493c6be3SSridhar Samudrala __wsum csum = 0; 920493c6be3SSridhar Samudrala 921493c6be3SSridhar Samudrala if (skb_queue_len(&sk->sk_write_queue) == 1) { 922493c6be3SSridhar Samudrala /* Only one fragment on the socket. */ 923493c6be3SSridhar Samudrala skb->csum_start = skb_transport_header(skb) - skb->head; 924493c6be3SSridhar Samudrala skb->csum_offset = offsetof(struct udphdr, check); 925493c6be3SSridhar Samudrala uh->check = ~csum_ipv6_magic(saddr, daddr, len, IPPROTO_UDP, 0); 926493c6be3SSridhar Samudrala } else { 927493c6be3SSridhar Samudrala /* 928493c6be3SSridhar Samudrala * HW-checksum won't work as there are two or more 929493c6be3SSridhar Samudrala * fragments on the socket so that all csums of sk_buffs 930493c6be3SSridhar Samudrala * should be together 931493c6be3SSridhar Samudrala */ 932493c6be3SSridhar Samudrala offset = skb_transport_offset(skb); 933493c6be3SSridhar Samudrala skb->csum = skb_checksum(skb, offset, skb->len - offset, 0); 934493c6be3SSridhar Samudrala 935493c6be3SSridhar Samudrala skb->ip_summed = CHECKSUM_NONE; 936493c6be3SSridhar Samudrala 937493c6be3SSridhar Samudrala skb_queue_walk(&sk->sk_write_queue, skb) { 938493c6be3SSridhar Samudrala csum = csum_add(csum, skb->csum); 939493c6be3SSridhar Samudrala } 940493c6be3SSridhar Samudrala 941493c6be3SSridhar Samudrala uh->check = csum_ipv6_magic(saddr, daddr, len, IPPROTO_UDP, 942493c6be3SSridhar Samudrala csum); 943493c6be3SSridhar Samudrala if (uh->check == 0) 944493c6be3SSridhar Samudrala uh->check = CSUM_MANGLED_0; 945493c6be3SSridhar Samudrala } 946493c6be3SSridhar Samudrala } 947493c6be3SSridhar Samudrala 948db8dac20SDavid S. Miller /* 949db8dac20SDavid S. Miller * Sending 950db8dac20SDavid S. Miller */ 951db8dac20SDavid S. Miller 952db8dac20SDavid S. Miller static int udp_v6_push_pending_frames(struct sock *sk) 953db8dac20SDavid S. Miller { 954db8dac20SDavid S. Miller struct sk_buff *skb; 955db8dac20SDavid S. Miller struct udphdr *uh; 956db8dac20SDavid S. Miller struct udp_sock *up = udp_sk(sk); 957db8dac20SDavid S. Miller struct inet_sock *inet = inet_sk(sk); 9584c9483b2SDavid S. Miller struct flowi6 *fl6 = &inet->cork.fl.u.ip6; 959db8dac20SDavid S. Miller int err = 0; 960db8dac20SDavid S. Miller int is_udplite = IS_UDPLITE(sk); 961db8dac20SDavid S. Miller __wsum csum = 0; 962db8dac20SDavid S. Miller 963db8dac20SDavid S. Miller /* Grab the skbuff where UDP header space exists. */ 964db8dac20SDavid S. Miller if ((skb = skb_peek(&sk->sk_write_queue)) == NULL) 965db8dac20SDavid S. Miller goto out; 966db8dac20SDavid S. Miller 967db8dac20SDavid S. Miller /* 968db8dac20SDavid S. Miller * Create a UDP header 969db8dac20SDavid S. Miller */ 970db8dac20SDavid S. Miller uh = udp_hdr(skb); 9711958b856SDavid S. Miller uh->source = fl6->fl6_sport; 9721958b856SDavid S. Miller uh->dest = fl6->fl6_dport; 973db8dac20SDavid S. Miller uh->len = htons(up->len); 974db8dac20SDavid S. Miller uh->check = 0; 975db8dac20SDavid S. Miller 976db8dac20SDavid S. Miller if (is_udplite) 977db8dac20SDavid S. Miller csum = udplite_csum_outgoing(sk, skb); 978493c6be3SSridhar Samudrala else if (skb->ip_summed == CHECKSUM_PARTIAL) { /* UDP hardware csum */ 9794c9483b2SDavid S. Miller udp6_hwcsum_outgoing(sk, skb, &fl6->saddr, &fl6->daddr, 980493c6be3SSridhar Samudrala up->len); 981493c6be3SSridhar Samudrala goto send; 982493c6be3SSridhar Samudrala } else 983db8dac20SDavid S. Miller csum = udp_csum_outgoing(sk, skb); 984db8dac20SDavid S. Miller 985db8dac20SDavid S. Miller /* add protocol-dependent pseudo-header */ 9864c9483b2SDavid S. Miller uh->check = csum_ipv6_magic(&fl6->saddr, &fl6->daddr, 9874c9483b2SDavid S. Miller up->len, fl6->flowi6_proto, csum); 988db8dac20SDavid S. Miller if (uh->check == 0) 989db8dac20SDavid S. Miller uh->check = CSUM_MANGLED_0; 990db8dac20SDavid S. Miller 991493c6be3SSridhar Samudrala send: 992db8dac20SDavid S. Miller err = ip6_push_pending_frames(sk); 9936ce9e7b5SEric Dumazet if (err) { 9946ce9e7b5SEric Dumazet if (err == -ENOBUFS && !inet6_sk(sk)->recverr) { 9956ce9e7b5SEric Dumazet UDP6_INC_STATS_USER(sock_net(sk), 9966ce9e7b5SEric Dumazet UDP_MIB_SNDBUFERRORS, is_udplite); 9976ce9e7b5SEric Dumazet err = 0; 9986ce9e7b5SEric Dumazet } 9996ce9e7b5SEric Dumazet } else 10006ce9e7b5SEric Dumazet UDP6_INC_STATS_USER(sock_net(sk), 10016ce9e7b5SEric Dumazet UDP_MIB_OUTDATAGRAMS, is_udplite); 1002db8dac20SDavid S. Miller out: 1003db8dac20SDavid S. Miller up->len = 0; 1004db8dac20SDavid S. Miller up->pending = 0; 1005db8dac20SDavid S. Miller return err; 1006db8dac20SDavid S. Miller } 1007db8dac20SDavid S. Miller 1008db8dac20SDavid S. Miller int udpv6_sendmsg(struct kiocb *iocb, struct sock *sk, 1009db8dac20SDavid S. Miller struct msghdr *msg, size_t len) 1010db8dac20SDavid S. Miller { 1011db8dac20SDavid S. Miller struct ipv6_txoptions opt_space; 1012db8dac20SDavid S. Miller struct udp_sock *up = udp_sk(sk); 1013db8dac20SDavid S. Miller struct inet_sock *inet = inet_sk(sk); 1014db8dac20SDavid S. Miller struct ipv6_pinfo *np = inet6_sk(sk); 1015db8dac20SDavid S. Miller struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *) msg->msg_name; 101620c59de2SArnaud Ebalard struct in6_addr *daddr, *final_p, final; 1017db8dac20SDavid S. Miller struct ipv6_txoptions *opt = NULL; 1018db8dac20SDavid S. Miller struct ip6_flowlabel *flowlabel = NULL; 10194c9483b2SDavid S. Miller struct flowi6 fl6; 1020db8dac20SDavid S. Miller struct dst_entry *dst; 1021db8dac20SDavid S. Miller int addr_len = msg->msg_namelen; 1022db8dac20SDavid S. Miller int ulen = len; 1023db8dac20SDavid S. Miller int hlimit = -1; 1024db8dac20SDavid S. Miller int tclass = -1; 102513b52cd4SBrian Haley int dontfrag = -1; 1026db8dac20SDavid S. Miller int corkreq = up->corkflag || msg->msg_flags&MSG_MORE; 1027db8dac20SDavid S. Miller int err; 1028db8dac20SDavid S. Miller int connected = 0; 1029db8dac20SDavid S. Miller int is_udplite = IS_UDPLITE(sk); 1030db8dac20SDavid S. Miller int (*getfrag)(void *, char *, int, int, int, struct sk_buff *); 1031db8dac20SDavid S. Miller 1032db8dac20SDavid S. Miller /* destination address check */ 1033db8dac20SDavid S. Miller if (sin6) { 1034db8dac20SDavid S. Miller if (addr_len < offsetof(struct sockaddr, sa_data)) 1035db8dac20SDavid S. Miller return -EINVAL; 1036db8dac20SDavid S. Miller 1037db8dac20SDavid S. Miller switch (sin6->sin6_family) { 1038db8dac20SDavid S. Miller case AF_INET6: 1039db8dac20SDavid S. Miller if (addr_len < SIN6_LEN_RFC2133) 1040db8dac20SDavid S. Miller return -EINVAL; 1041db8dac20SDavid S. Miller daddr = &sin6->sin6_addr; 1042db8dac20SDavid S. Miller break; 1043db8dac20SDavid S. Miller case AF_INET: 1044db8dac20SDavid S. Miller goto do_udp_sendmsg; 1045db8dac20SDavid S. Miller case AF_UNSPEC: 1046db8dac20SDavid S. Miller msg->msg_name = sin6 = NULL; 1047db8dac20SDavid S. Miller msg->msg_namelen = addr_len = 0; 1048db8dac20SDavid S. Miller daddr = NULL; 1049db8dac20SDavid S. Miller break; 1050db8dac20SDavid S. Miller default: 1051db8dac20SDavid S. Miller return -EINVAL; 1052db8dac20SDavid S. Miller } 1053db8dac20SDavid S. Miller } else if (!up->pending) { 1054db8dac20SDavid S. Miller if (sk->sk_state != TCP_ESTABLISHED) 1055db8dac20SDavid S. Miller return -EDESTADDRREQ; 1056db8dac20SDavid S. Miller daddr = &np->daddr; 1057db8dac20SDavid S. Miller } else 1058db8dac20SDavid S. Miller daddr = NULL; 1059db8dac20SDavid S. Miller 1060db8dac20SDavid S. Miller if (daddr) { 1061db8dac20SDavid S. Miller if (ipv6_addr_v4mapped(daddr)) { 1062db8dac20SDavid S. Miller struct sockaddr_in sin; 1063db8dac20SDavid S. Miller sin.sin_family = AF_INET; 1064c720c7e8SEric Dumazet sin.sin_port = sin6 ? sin6->sin6_port : inet->inet_dport; 1065db8dac20SDavid S. Miller sin.sin_addr.s_addr = daddr->s6_addr32[3]; 1066db8dac20SDavid S. Miller msg->msg_name = &sin; 1067db8dac20SDavid S. Miller msg->msg_namelen = sizeof(sin); 1068db8dac20SDavid S. Miller do_udp_sendmsg: 1069db8dac20SDavid S. Miller if (__ipv6_only_sock(sk)) 1070db8dac20SDavid S. Miller return -ENETUNREACH; 1071db8dac20SDavid S. Miller return udp_sendmsg(iocb, sk, msg, len); 1072db8dac20SDavid S. Miller } 1073db8dac20SDavid S. Miller } 1074db8dac20SDavid S. Miller 1075db8dac20SDavid S. Miller if (up->pending == AF_INET) 1076db8dac20SDavid S. Miller return udp_sendmsg(iocb, sk, msg, len); 1077db8dac20SDavid S. Miller 1078db8dac20SDavid S. Miller /* Rough check on arithmetic overflow, 1079db8dac20SDavid S. Miller better check is made in ip6_append_data(). 1080db8dac20SDavid S. Miller */ 1081db8dac20SDavid S. Miller if (len > INT_MAX - sizeof(struct udphdr)) 1082db8dac20SDavid S. Miller return -EMSGSIZE; 1083db8dac20SDavid S. Miller 1084db8dac20SDavid S. Miller if (up->pending) { 1085db8dac20SDavid S. Miller /* 1086db8dac20SDavid S. Miller * There are pending frames. 1087db8dac20SDavid S. Miller * The socket lock must be held while it's corked. 1088db8dac20SDavid S. Miller */ 1089db8dac20SDavid S. Miller lock_sock(sk); 1090db8dac20SDavid S. Miller if (likely(up->pending)) { 1091db8dac20SDavid S. Miller if (unlikely(up->pending != AF_INET6)) { 1092db8dac20SDavid S. Miller release_sock(sk); 1093db8dac20SDavid S. Miller return -EAFNOSUPPORT; 1094db8dac20SDavid S. Miller } 1095db8dac20SDavid S. Miller dst = NULL; 1096db8dac20SDavid S. Miller goto do_append_data; 1097db8dac20SDavid S. Miller } 1098db8dac20SDavid S. Miller release_sock(sk); 1099db8dac20SDavid S. Miller } 1100db8dac20SDavid S. Miller ulen += sizeof(struct udphdr); 1101db8dac20SDavid S. Miller 11024c9483b2SDavid S. Miller memset(&fl6, 0, sizeof(fl6)); 1103db8dac20SDavid S. Miller 1104db8dac20SDavid S. Miller if (sin6) { 1105db8dac20SDavid S. Miller if (sin6->sin6_port == 0) 1106db8dac20SDavid S. Miller return -EINVAL; 1107db8dac20SDavid S. Miller 11081958b856SDavid S. Miller fl6.fl6_dport = sin6->sin6_port; 1109db8dac20SDavid S. Miller daddr = &sin6->sin6_addr; 1110db8dac20SDavid S. Miller 1111db8dac20SDavid S. Miller if (np->sndflow) { 11124c9483b2SDavid S. Miller fl6.flowlabel = sin6->sin6_flowinfo&IPV6_FLOWINFO_MASK; 11134c9483b2SDavid S. Miller if (fl6.flowlabel&IPV6_FLOWLABEL_MASK) { 11144c9483b2SDavid S. Miller flowlabel = fl6_sock_lookup(sk, fl6.flowlabel); 1115db8dac20SDavid S. Miller if (flowlabel == NULL) 1116db8dac20SDavid S. Miller return -EINVAL; 1117db8dac20SDavid S. Miller daddr = &flowlabel->dst; 1118db8dac20SDavid S. Miller } 1119db8dac20SDavid S. Miller } 1120db8dac20SDavid S. Miller 1121db8dac20SDavid S. Miller /* 1122db8dac20SDavid S. Miller * Otherwise it will be difficult to maintain 1123db8dac20SDavid S. Miller * sk->sk_dst_cache. 1124db8dac20SDavid S. Miller */ 1125db8dac20SDavid S. Miller if (sk->sk_state == TCP_ESTABLISHED && 1126db8dac20SDavid S. Miller ipv6_addr_equal(daddr, &np->daddr)) 1127db8dac20SDavid S. Miller daddr = &np->daddr; 1128db8dac20SDavid S. Miller 1129db8dac20SDavid S. Miller if (addr_len >= sizeof(struct sockaddr_in6) && 1130db8dac20SDavid S. Miller sin6->sin6_scope_id && 1131842df073SHannes Frederic Sowa __ipv6_addr_needs_scope_id(__ipv6_addr_type(daddr))) 11324c9483b2SDavid S. Miller fl6.flowi6_oif = sin6->sin6_scope_id; 1133db8dac20SDavid S. Miller } else { 1134db8dac20SDavid S. Miller if (sk->sk_state != TCP_ESTABLISHED) 1135db8dac20SDavid S. Miller return -EDESTADDRREQ; 1136db8dac20SDavid S. Miller 11371958b856SDavid S. Miller fl6.fl6_dport = inet->inet_dport; 1138db8dac20SDavid S. Miller daddr = &np->daddr; 11394c9483b2SDavid S. Miller fl6.flowlabel = np->flow_label; 1140db8dac20SDavid S. Miller connected = 1; 1141db8dac20SDavid S. Miller } 1142db8dac20SDavid S. Miller 11434c9483b2SDavid S. Miller if (!fl6.flowi6_oif) 11444c9483b2SDavid S. Miller fl6.flowi6_oif = sk->sk_bound_dev_if; 1145db8dac20SDavid S. Miller 11464c9483b2SDavid S. Miller if (!fl6.flowi6_oif) 11474c9483b2SDavid S. Miller fl6.flowi6_oif = np->sticky_pktinfo.ipi6_ifindex; 11489f690db7SYang Hongyang 11494c9483b2SDavid S. Miller fl6.flowi6_mark = sk->sk_mark; 115051953d5bSBrian Haley 1151db8dac20SDavid S. Miller if (msg->msg_controllen) { 1152db8dac20SDavid S. Miller opt = &opt_space; 1153db8dac20SDavid S. Miller memset(opt, 0, sizeof(struct ipv6_txoptions)); 1154db8dac20SDavid S. Miller opt->tot_len = sizeof(*opt); 1155db8dac20SDavid S. Miller 115673df66f8STom Parkin err = ip6_datagram_send_ctl(sock_net(sk), sk, msg, &fl6, opt, 1157ec0506dbSMaciej Żenczykowski &hlimit, &tclass, &dontfrag); 1158db8dac20SDavid S. Miller if (err < 0) { 1159db8dac20SDavid S. Miller fl6_sock_release(flowlabel); 1160db8dac20SDavid S. Miller return err; 1161db8dac20SDavid S. Miller } 11624c9483b2SDavid S. Miller if ((fl6.flowlabel&IPV6_FLOWLABEL_MASK) && !flowlabel) { 11634c9483b2SDavid S. Miller flowlabel = fl6_sock_lookup(sk, fl6.flowlabel); 1164db8dac20SDavid S. Miller if (flowlabel == NULL) 1165db8dac20SDavid S. Miller return -EINVAL; 1166db8dac20SDavid S. Miller } 1167db8dac20SDavid S. Miller if (!(opt->opt_nflen|opt->opt_flen)) 1168db8dac20SDavid S. Miller opt = NULL; 1169db8dac20SDavid S. Miller connected = 0; 1170db8dac20SDavid S. Miller } 1171db8dac20SDavid S. Miller if (opt == NULL) 1172db8dac20SDavid S. Miller opt = np->opt; 1173db8dac20SDavid S. Miller if (flowlabel) 1174db8dac20SDavid S. Miller opt = fl6_merge_options(&opt_space, flowlabel, opt); 1175db8dac20SDavid S. Miller opt = ipv6_fixup_options(&opt_space, opt); 1176db8dac20SDavid S. Miller 11774c9483b2SDavid S. Miller fl6.flowi6_proto = sk->sk_protocol; 1178876c7f41SBrian Haley if (!ipv6_addr_any(daddr)) 11794e3fd7a0SAlexey Dobriyan fl6.daddr = *daddr; 1180876c7f41SBrian Haley else 11814c9483b2SDavid S. Miller fl6.daddr.s6_addr[15] = 0x1; /* :: means loopback (BSD'ism) */ 11824c9483b2SDavid S. Miller if (ipv6_addr_any(&fl6.saddr) && !ipv6_addr_any(&np->saddr)) 11834e3fd7a0SAlexey Dobriyan fl6.saddr = np->saddr; 11841958b856SDavid S. Miller fl6.fl6_sport = inet->inet_sport; 1185db8dac20SDavid S. Miller 11864c9483b2SDavid S. Miller final_p = fl6_update_dst(&fl6, opt, &final); 118720c59de2SArnaud Ebalard if (final_p) 1188db8dac20SDavid S. Miller connected = 0; 1189db8dac20SDavid S. Miller 11904c9483b2SDavid S. Miller if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr)) { 11914c9483b2SDavid S. Miller fl6.flowi6_oif = np->mcast_oif; 1192db8dac20SDavid S. Miller connected = 0; 1193c4062dfcSErich E. Hoover } else if (!fl6.flowi6_oif) 1194c4062dfcSErich E. Hoover fl6.flowi6_oif = np->ucast_oif; 1195db8dac20SDavid S. Miller 11964c9483b2SDavid S. Miller security_sk_classify_flow(sk, flowi6_to_flowi(&fl6)); 1197db8dac20SDavid S. Miller 11984c9483b2SDavid S. Miller dst = ip6_sk_dst_lookup_flow(sk, &fl6, final_p, true); 119968d0c6d3SDavid S. Miller if (IS_ERR(dst)) { 120068d0c6d3SDavid S. Miller err = PTR_ERR(dst); 120168d0c6d3SDavid S. Miller dst = NULL; 1202db8dac20SDavid S. Miller goto out; 1203db8dac20SDavid S. Miller } 1204db8dac20SDavid S. Miller 1205db8dac20SDavid S. Miller if (hlimit < 0) { 12064c9483b2SDavid S. Miller if (ipv6_addr_is_multicast(&fl6.daddr)) 1207db8dac20SDavid S. Miller hlimit = np->mcast_hops; 1208db8dac20SDavid S. Miller else 1209db8dac20SDavid S. Miller hlimit = np->hop_limit; 1210db8dac20SDavid S. Miller if (hlimit < 0) 12116b75d090SYOSHIFUJI Hideaki hlimit = ip6_dst_hoplimit(dst); 1212db8dac20SDavid S. Miller } 1213db8dac20SDavid S. Miller 1214db8dac20SDavid S. Miller if (tclass < 0) 1215e651f03aSGerrit Renker tclass = np->tclass; 1216db8dac20SDavid S. Miller 121713b52cd4SBrian Haley if (dontfrag < 0) 121813b52cd4SBrian Haley dontfrag = np->dontfrag; 121913b52cd4SBrian Haley 1220db8dac20SDavid S. Miller if (msg->msg_flags&MSG_CONFIRM) 1221db8dac20SDavid S. Miller goto do_confirm; 1222db8dac20SDavid S. Miller back_from_confirm: 1223db8dac20SDavid S. Miller 1224db8dac20SDavid S. Miller lock_sock(sk); 1225db8dac20SDavid S. Miller if (unlikely(up->pending)) { 1226db8dac20SDavid S. Miller /* The socket is already corked while preparing it. */ 1227db8dac20SDavid S. Miller /* ... which is an evident application bug. --ANK */ 1228db8dac20SDavid S. Miller release_sock(sk); 1229db8dac20SDavid S. Miller 1230db8dac20SDavid S. Miller LIMIT_NETDEBUG(KERN_DEBUG "udp cork app bug 2\n"); 1231db8dac20SDavid S. Miller err = -EINVAL; 1232db8dac20SDavid S. Miller goto out; 1233db8dac20SDavid S. Miller } 1234db8dac20SDavid S. Miller 1235db8dac20SDavid S. Miller up->pending = AF_INET6; 1236db8dac20SDavid S. Miller 1237db8dac20SDavid S. Miller do_append_data: 1238db8dac20SDavid S. Miller up->len += ulen; 1239db8dac20SDavid S. Miller getfrag = is_udplite ? udplite_getfrag : ip_generic_getfrag; 1240db8dac20SDavid S. Miller err = ip6_append_data(sk, getfrag, msg->msg_iov, ulen, 12414c9483b2SDavid S. Miller sizeof(struct udphdr), hlimit, tclass, opt, &fl6, 1242db8dac20SDavid S. Miller (struct rt6_info*)dst, 124313b52cd4SBrian Haley corkreq ? msg->msg_flags|MSG_MORE : msg->msg_flags, dontfrag); 1244db8dac20SDavid S. Miller if (err) 1245db8dac20SDavid S. Miller udp_v6_flush_pending_frames(sk); 1246db8dac20SDavid S. Miller else if (!corkreq) 1247db8dac20SDavid S. Miller err = udp_v6_push_pending_frames(sk); 1248db8dac20SDavid S. Miller else if (unlikely(skb_queue_empty(&sk->sk_write_queue))) 1249db8dac20SDavid S. Miller up->pending = 0; 1250db8dac20SDavid S. Miller 1251db8dac20SDavid S. Miller if (dst) { 1252db8dac20SDavid S. Miller if (connected) { 1253db8dac20SDavid S. Miller ip6_dst_store(sk, dst, 12544c9483b2SDavid S. Miller ipv6_addr_equal(&fl6.daddr, &np->daddr) ? 1255db8dac20SDavid S. Miller &np->daddr : NULL, 1256db8dac20SDavid S. Miller #ifdef CONFIG_IPV6_SUBTREES 12574c9483b2SDavid S. Miller ipv6_addr_equal(&fl6.saddr, &np->saddr) ? 1258db8dac20SDavid S. Miller &np->saddr : 1259db8dac20SDavid S. Miller #endif 1260db8dac20SDavid S. Miller NULL); 1261db8dac20SDavid S. Miller } else { 1262db8dac20SDavid S. Miller dst_release(dst); 1263db8dac20SDavid S. Miller } 1264a3c96089SYOSHIFUJI Hideaki dst = NULL; 1265db8dac20SDavid S. Miller } 1266db8dac20SDavid S. Miller 1267db8dac20SDavid S. Miller if (err > 0) 1268db8dac20SDavid S. Miller err = np->recverr ? net_xmit_errno(err) : 0; 1269db8dac20SDavid S. Miller release_sock(sk); 1270db8dac20SDavid S. Miller out: 1271a3c96089SYOSHIFUJI Hideaki dst_release(dst); 1272db8dac20SDavid S. Miller fl6_sock_release(flowlabel); 1273db8dac20SDavid S. Miller if (!err) 1274db8dac20SDavid S. Miller return len; 1275db8dac20SDavid S. Miller /* 1276db8dac20SDavid S. Miller * ENOBUFS = no kernel mem, SOCK_NOSPACE = no sndbuf space. Reporting 1277db8dac20SDavid S. Miller * ENOBUFS might not be good (it's not tunable per se), but otherwise 1278db8dac20SDavid S. Miller * we don't have a good statistic (IpOutDiscards but it can be too many 1279db8dac20SDavid S. Miller * things). We could add another new stat but at least for now that 1280db8dac20SDavid S. Miller * seems like overkill. 1281db8dac20SDavid S. Miller */ 1282db8dac20SDavid S. Miller if (err == -ENOBUFS || test_bit(SOCK_NOSPACE, &sk->sk_socket->flags)) { 1283235b9f7aSPavel Emelyanov UDP6_INC_STATS_USER(sock_net(sk), 1284235b9f7aSPavel Emelyanov UDP_MIB_SNDBUFERRORS, is_udplite); 1285db8dac20SDavid S. Miller } 1286db8dac20SDavid S. Miller return err; 1287db8dac20SDavid S. Miller 1288db8dac20SDavid S. Miller do_confirm: 1289db8dac20SDavid S. Miller dst_confirm(dst); 1290db8dac20SDavid S. Miller if (!(msg->msg_flags&MSG_PROBE) || len) 1291db8dac20SDavid S. Miller goto back_from_confirm; 1292db8dac20SDavid S. Miller err = 0; 1293db8dac20SDavid S. Miller goto out; 1294db8dac20SDavid S. Miller } 1295db8dac20SDavid S. Miller 12967d06b2e0SBrian Haley void udpv6_destroy_sock(struct sock *sk) 1297db8dac20SDavid S. Miller { 129844046a59STom Parkin struct udp_sock *up = udp_sk(sk); 1299db8dac20SDavid S. Miller lock_sock(sk); 1300db8dac20SDavid S. Miller udp_v6_flush_pending_frames(sk); 1301db8dac20SDavid S. Miller release_sock(sk); 1302db8dac20SDavid S. Miller 130344046a59STom Parkin if (static_key_false(&udpv6_encap_needed) && up->encap_type) { 130444046a59STom Parkin void (*encap_destroy)(struct sock *sk); 130544046a59STom Parkin encap_destroy = ACCESS_ONCE(up->encap_destroy); 130644046a59STom Parkin if (encap_destroy) 130744046a59STom Parkin encap_destroy(sk); 130844046a59STom Parkin } 130944046a59STom Parkin 1310db8dac20SDavid S. Miller inet6_destroy_sock(sk); 1311db8dac20SDavid S. Miller } 1312db8dac20SDavid S. Miller 1313db8dac20SDavid S. Miller /* 1314db8dac20SDavid S. Miller * Socket option code for UDP 1315db8dac20SDavid S. Miller */ 1316db8dac20SDavid S. Miller int udpv6_setsockopt(struct sock *sk, int level, int optname, 1317b7058842SDavid S. Miller char __user *optval, unsigned int optlen) 1318db8dac20SDavid S. Miller { 1319db8dac20SDavid S. Miller if (level == SOL_UDP || level == SOL_UDPLITE) 1320db8dac20SDavid S. Miller return udp_lib_setsockopt(sk, level, optname, optval, optlen, 1321db8dac20SDavid S. Miller udp_v6_push_pending_frames); 1322db8dac20SDavid S. Miller return ipv6_setsockopt(sk, level, optname, optval, optlen); 1323db8dac20SDavid S. Miller } 1324db8dac20SDavid S. Miller 1325db8dac20SDavid S. Miller #ifdef CONFIG_COMPAT 1326db8dac20SDavid S. Miller int compat_udpv6_setsockopt(struct sock *sk, int level, int optname, 1327b7058842SDavid S. Miller char __user *optval, unsigned int optlen) 1328db8dac20SDavid S. Miller { 1329db8dac20SDavid S. Miller if (level == SOL_UDP || level == SOL_UDPLITE) 1330db8dac20SDavid S. Miller return udp_lib_setsockopt(sk, level, optname, optval, optlen, 1331db8dac20SDavid S. Miller udp_v6_push_pending_frames); 1332db8dac20SDavid S. Miller return compat_ipv6_setsockopt(sk, level, optname, optval, optlen); 1333db8dac20SDavid S. Miller } 1334db8dac20SDavid S. Miller #endif 1335db8dac20SDavid S. Miller 1336db8dac20SDavid S. Miller int udpv6_getsockopt(struct sock *sk, int level, int optname, 1337db8dac20SDavid S. Miller char __user *optval, int __user *optlen) 1338db8dac20SDavid S. Miller { 1339db8dac20SDavid S. Miller if (level == SOL_UDP || level == SOL_UDPLITE) 1340db8dac20SDavid S. Miller return udp_lib_getsockopt(sk, level, optname, optval, optlen); 1341db8dac20SDavid S. Miller return ipv6_getsockopt(sk, level, optname, optval, optlen); 1342db8dac20SDavid S. Miller } 1343db8dac20SDavid S. Miller 1344db8dac20SDavid S. Miller #ifdef CONFIG_COMPAT 1345db8dac20SDavid S. Miller int compat_udpv6_getsockopt(struct sock *sk, int level, int optname, 1346db8dac20SDavid S. Miller char __user *optval, int __user *optlen) 1347db8dac20SDavid S. Miller { 1348db8dac20SDavid S. Miller if (level == SOL_UDP || level == SOL_UDPLITE) 1349db8dac20SDavid S. Miller return udp_lib_getsockopt(sk, level, optname, optval, optlen); 1350db8dac20SDavid S. Miller return compat_ipv6_getsockopt(sk, level, optname, optval, optlen); 1351db8dac20SDavid S. Miller } 1352db8dac20SDavid S. Miller #endif 1353db8dac20SDavid S. Miller 135441135cc8SAlexey Dobriyan static const struct inet6_protocol udpv6_protocol = { 1355db8dac20SDavid S. Miller .handler = udpv6_rcv, 1356db8dac20SDavid S. Miller .err_handler = udpv6_err, 1357db8dac20SDavid S. Miller .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL, 1358db8dac20SDavid S. Miller }; 1359db8dac20SDavid S. Miller 1360db8dac20SDavid S. Miller /* ------------------------------------------------------------------------ */ 1361db8dac20SDavid S. Miller #ifdef CONFIG_PROC_FS 1362db8dac20SDavid S. Miller 1363db8dac20SDavid S. Miller static void udp6_sock_seq_show(struct seq_file *seq, struct sock *sp, int bucket) 1364db8dac20SDavid S. Miller { 1365db8dac20SDavid S. Miller struct inet_sock *inet = inet_sk(sp); 1366db8dac20SDavid S. Miller struct ipv6_pinfo *np = inet6_sk(sp); 1367b71d1d42SEric Dumazet const struct in6_addr *dest, *src; 1368db8dac20SDavid S. Miller __u16 destp, srcp; 1369db8dac20SDavid S. Miller 1370db8dac20SDavid S. Miller dest = &np->daddr; 1371db8dac20SDavid S. Miller src = &np->rcv_saddr; 1372c720c7e8SEric Dumazet destp = ntohs(inet->inet_dport); 1373c720c7e8SEric Dumazet srcp = ntohs(inet->inet_sport); 1374db8dac20SDavid S. Miller seq_printf(seq, 1375f86dcc5aSEric Dumazet "%5d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X " 137671338aa7SDan Rosenberg "%02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %pK %d\n", 1377db8dac20SDavid S. Miller bucket, 1378db8dac20SDavid S. Miller src->s6_addr32[0], src->s6_addr32[1], 1379db8dac20SDavid S. Miller src->s6_addr32[2], src->s6_addr32[3], srcp, 1380db8dac20SDavid S. Miller dest->s6_addr32[0], dest->s6_addr32[1], 1381db8dac20SDavid S. Miller dest->s6_addr32[2], dest->s6_addr32[3], destp, 1382db8dac20SDavid S. Miller sp->sk_state, 138331e6d363SEric Dumazet sk_wmem_alloc_get(sp), 138431e6d363SEric Dumazet sk_rmem_alloc_get(sp), 1385db8dac20SDavid S. Miller 0, 0L, 0, 1386a7cb5a49SEric W. Biederman from_kuid_munged(seq_user_ns(seq), sock_i_uid(sp)), 1387a7cb5a49SEric W. Biederman 0, 1388db8dac20SDavid S. Miller sock_i_ino(sp), 1389cb61cb9bSEric Dumazet atomic_read(&sp->sk_refcnt), sp, 1390cb61cb9bSEric Dumazet atomic_read(&sp->sk_drops)); 1391db8dac20SDavid S. Miller } 1392db8dac20SDavid S. Miller 1393db8dac20SDavid S. Miller int udp6_seq_show(struct seq_file *seq, void *v) 1394db8dac20SDavid S. Miller { 1395db8dac20SDavid S. Miller if (v == SEQ_START_TOKEN) 1396db8dac20SDavid S. Miller seq_printf(seq, 1397db8dac20SDavid S. Miller " sl " 1398db8dac20SDavid S. Miller "local_address " 1399db8dac20SDavid S. Miller "remote_address " 1400db8dac20SDavid S. Miller "st tx_queue rx_queue tr tm->when retrnsmt" 1401cb61cb9bSEric Dumazet " uid timeout inode ref pointer drops\n"); 1402db8dac20SDavid S. Miller else 1403db8dac20SDavid S. Miller udp6_sock_seq_show(seq, v, ((struct udp_iter_state *)seq->private)->bucket); 1404db8dac20SDavid S. Miller return 0; 1405db8dac20SDavid S. Miller } 1406db8dac20SDavid S. Miller 140773cb88ecSArjan van de Ven static const struct file_operations udp6_afinfo_seq_fops = { 140873cb88ecSArjan van de Ven .owner = THIS_MODULE, 140973cb88ecSArjan van de Ven .open = udp_seq_open, 141073cb88ecSArjan van de Ven .read = seq_read, 141173cb88ecSArjan van de Ven .llseek = seq_lseek, 141273cb88ecSArjan van de Ven .release = seq_release_net 141373cb88ecSArjan van de Ven }; 141473cb88ecSArjan van de Ven 1415db8dac20SDavid S. Miller static struct udp_seq_afinfo udp6_seq_afinfo = { 1416db8dac20SDavid S. Miller .name = "udp6", 1417db8dac20SDavid S. Miller .family = AF_INET6, 1418645ca708SEric Dumazet .udp_table = &udp_table, 141973cb88ecSArjan van de Ven .seq_fops = &udp6_afinfo_seq_fops, 1420dda61925SDenis V. Lunev .seq_ops = { 1421dda61925SDenis V. Lunev .show = udp6_seq_show, 1422dda61925SDenis V. Lunev }, 1423db8dac20SDavid S. Miller }; 1424db8dac20SDavid S. Miller 14252c8c1e72SAlexey Dobriyan int __net_init udp6_proc_init(struct net *net) 1426db8dac20SDavid S. Miller { 14270c96d8c5SDaniel Lezcano return udp_proc_register(net, &udp6_seq_afinfo); 1428db8dac20SDavid S. Miller } 1429db8dac20SDavid S. Miller 14300c96d8c5SDaniel Lezcano void udp6_proc_exit(struct net *net) { 14310c96d8c5SDaniel Lezcano udp_proc_unregister(net, &udp6_seq_afinfo); 1432db8dac20SDavid S. Miller } 1433db8dac20SDavid S. Miller #endif /* CONFIG_PROC_FS */ 1434db8dac20SDavid S. Miller 1435f77d6021SEric Dumazet void udp_v6_clear_sk(struct sock *sk, int size) 1436f77d6021SEric Dumazet { 1437f77d6021SEric Dumazet struct inet_sock *inet = inet_sk(sk); 1438f77d6021SEric Dumazet 1439f77d6021SEric Dumazet /* we do not want to clear pinet6 field, because of RCU lookups */ 1440f77d6021SEric Dumazet sk_prot_clear_portaddr_nulls(sk, offsetof(struct inet_sock, pinet6)); 1441f77d6021SEric Dumazet 1442f77d6021SEric Dumazet size -= offsetof(struct inet_sock, pinet6) + sizeof(inet->pinet6); 1443f77d6021SEric Dumazet memset(&inet->pinet6 + 1, 0, size); 1444f77d6021SEric Dumazet } 1445f77d6021SEric Dumazet 1446db8dac20SDavid S. Miller /* ------------------------------------------------------------------------ */ 1447db8dac20SDavid S. Miller 1448db8dac20SDavid S. Miller struct proto udpv6_prot = { 1449db8dac20SDavid S. Miller .name = "UDPv6", 1450db8dac20SDavid S. Miller .owner = THIS_MODULE, 1451db8dac20SDavid S. Miller .close = udp_lib_close, 1452db8dac20SDavid S. Miller .connect = ip6_datagram_connect, 1453db8dac20SDavid S. Miller .disconnect = udp_disconnect, 1454db8dac20SDavid S. Miller .ioctl = udp_ioctl, 1455db8dac20SDavid S. Miller .destroy = udpv6_destroy_sock, 1456db8dac20SDavid S. Miller .setsockopt = udpv6_setsockopt, 1457db8dac20SDavid S. Miller .getsockopt = udpv6_getsockopt, 1458db8dac20SDavid S. Miller .sendmsg = udpv6_sendmsg, 1459db8dac20SDavid S. Miller .recvmsg = udpv6_recvmsg, 1460f7ad74feSBenjamin LaHaise .backlog_rcv = __udpv6_queue_rcv_skb, 1461db8dac20SDavid S. Miller .hash = udp_lib_hash, 1462db8dac20SDavid S. Miller .unhash = udp_lib_unhash, 1463719f8358SEric Dumazet .rehash = udp_v6_rehash, 1464db8dac20SDavid S. Miller .get_port = udp_v6_get_port, 1465db8dac20SDavid S. Miller .memory_allocated = &udp_memory_allocated, 1466db8dac20SDavid S. Miller .sysctl_mem = sysctl_udp_mem, 1467db8dac20SDavid S. Miller .sysctl_wmem = &sysctl_udp_wmem_min, 1468db8dac20SDavid S. Miller .sysctl_rmem = &sysctl_udp_rmem_min, 1469db8dac20SDavid S. Miller .obj_size = sizeof(struct udp6_sock), 1470271b72c7SEric Dumazet .slab_flags = SLAB_DESTROY_BY_RCU, 1471645ca708SEric Dumazet .h.udp_table = &udp_table, 1472db8dac20SDavid S. Miller #ifdef CONFIG_COMPAT 1473db8dac20SDavid S. Miller .compat_setsockopt = compat_udpv6_setsockopt, 1474db8dac20SDavid S. Miller .compat_getsockopt = compat_udpv6_getsockopt, 1475db8dac20SDavid S. Miller #endif 1476f77d6021SEric Dumazet .clear_sk = udp_v6_clear_sk, 1477db8dac20SDavid S. Miller }; 1478db8dac20SDavid S. Miller 1479db8dac20SDavid S. Miller static struct inet_protosw udpv6_protosw = { 1480db8dac20SDavid S. Miller .type = SOCK_DGRAM, 1481db8dac20SDavid S. Miller .protocol = IPPROTO_UDP, 1482db8dac20SDavid S. Miller .prot = &udpv6_prot, 1483db8dac20SDavid S. Miller .ops = &inet6_dgram_ops, 1484db8dac20SDavid S. Miller .no_check = UDP_CSUM_DEFAULT, 1485db8dac20SDavid S. Miller .flags = INET_PROTOSW_PERMANENT, 1486db8dac20SDavid S. Miller }; 1487db8dac20SDavid S. Miller 1488db8dac20SDavid S. Miller 1489db8dac20SDavid S. Miller int __init udpv6_init(void) 1490db8dac20SDavid S. Miller { 1491db8dac20SDavid S. Miller int ret; 1492db8dac20SDavid S. Miller 14933336288aSVlad Yasevich ret = inet6_add_protocol(&udpv6_protocol, IPPROTO_UDP); 14943336288aSVlad Yasevich if (ret) 1495c6b641a4SVlad Yasevich goto out; 14963336288aSVlad Yasevich 1497db8dac20SDavid S. Miller ret = inet6_register_protosw(&udpv6_protosw); 1498db8dac20SDavid S. Miller if (ret) 1499db8dac20SDavid S. Miller goto out_udpv6_protocol; 1500db8dac20SDavid S. Miller out: 1501db8dac20SDavid S. Miller return ret; 1502db8dac20SDavid S. Miller 1503db8dac20SDavid S. Miller out_udpv6_protocol: 1504db8dac20SDavid S. Miller inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP); 1505db8dac20SDavid S. Miller goto out; 1506db8dac20SDavid S. Miller } 1507db8dac20SDavid S. Miller 1508db8dac20SDavid S. Miller void udpv6_exit(void) 1509db8dac20SDavid S. Miller { 1510db8dac20SDavid S. Miller inet6_unregister_protosw(&udpv6_protosw); 1511db8dac20SDavid S. Miller inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP); 1512db8dac20SDavid S. Miller } 1513