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> 387c0f6ba6SLinus Torvalds #include <linux/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> 490bd84065Ssubashab@codeaurora.org #include <net/inet_hashtables.h> 5072289b96STom Herbert #include <net/inet6_hashtables.h> 51076bb0c8SEliezer Tamir #include <net/busy_poll.h> 52e32ea7e7SCraig Gallek #include <net/sock_reuseport.h> 53db8dac20SDavid S. Miller 54db8dac20SDavid S. Miller #include <linux/proc_fs.h> 55db8dac20SDavid S. Miller #include <linux/seq_file.h> 5622911fc5SEric Dumazet #include <trace/events/skb.h> 57db8dac20SDavid S. Miller #include "udp_impl.h" 58db8dac20SDavid S. Miller 5963a6fff3SRobert Shearman static bool udp6_lib_exact_dif_match(struct net *net, struct sk_buff *skb) 6063a6fff3SRobert Shearman { 6163a6fff3SRobert Shearman #if defined(CONFIG_NET_L3_MASTER_DEV) 6263a6fff3SRobert Shearman if (!net->ipv4.sysctl_udp_l3mdev_accept && 6363a6fff3SRobert Shearman skb && ipv6_l3mdev_skb(IP6CB(skb)->flags)) 6463a6fff3SRobert Shearman return true; 6563a6fff3SRobert Shearman #endif 6663a6fff3SRobert Shearman return false; 6763a6fff3SRobert Shearman } 6863a6fff3SRobert Shearman 696eada011SEric Dumazet static u32 udp6_ehashfn(const struct net *net, 70b50026b5SHannes Frederic Sowa const struct in6_addr *laddr, 71b50026b5SHannes Frederic Sowa const u16 lport, 72b50026b5SHannes Frederic Sowa const struct in6_addr *faddr, 73b50026b5SHannes Frederic Sowa const __be16 fport) 74b50026b5SHannes Frederic Sowa { 751bbdceefSHannes Frederic Sowa static u32 udp6_ehash_secret __read_mostly; 761bbdceefSHannes Frederic Sowa static u32 udp_ipv6_hash_secret __read_mostly; 771bbdceefSHannes Frederic Sowa 781bbdceefSHannes Frederic Sowa u32 lhash, fhash; 791bbdceefSHannes Frederic Sowa 801bbdceefSHannes Frederic Sowa net_get_random_once(&udp6_ehash_secret, 811bbdceefSHannes Frederic Sowa sizeof(udp6_ehash_secret)); 821bbdceefSHannes Frederic Sowa net_get_random_once(&udp_ipv6_hash_secret, 831bbdceefSHannes Frederic Sowa sizeof(udp_ipv6_hash_secret)); 841bbdceefSHannes Frederic Sowa 851bbdceefSHannes Frederic Sowa lhash = (__force u32)laddr->s6_addr32[3]; 861bbdceefSHannes Frederic Sowa fhash = __ipv6_addr_jhash(faddr, udp_ipv6_hash_secret); 871bbdceefSHannes Frederic Sowa 88b50026b5SHannes Frederic Sowa return __inet6_ehashfn(lhash, lport, fhash, fport, 891bbdceefSHannes Frederic Sowa udp_ipv6_hash_secret + net_hash_mix(net)); 90b50026b5SHannes Frederic Sowa } 91b50026b5SHannes Frederic Sowa 926eada011SEric Dumazet static u32 udp6_portaddr_hash(const struct net *net, 93d4cada4aSEric Dumazet const struct in6_addr *addr6, 94d4cada4aSEric Dumazet unsigned int port) 95d4cada4aSEric Dumazet { 96d4cada4aSEric Dumazet unsigned int hash, mix = net_hash_mix(net); 97d4cada4aSEric Dumazet 98d4cada4aSEric Dumazet if (ipv6_addr_any(addr6)) 99d4cada4aSEric Dumazet hash = jhash_1word(0, mix); 100856540eeSBrian Haley else if (ipv6_addr_v4mapped(addr6)) 1010eae88f3SEric Dumazet hash = jhash_1word((__force u32)addr6->s6_addr32[3], mix); 102d4cada4aSEric Dumazet else 1030eae88f3SEric Dumazet hash = jhash2((__force u32 *)addr6->s6_addr32, 4, mix); 104d4cada4aSEric Dumazet 105d4cada4aSEric Dumazet return hash ^ port; 106d4cada4aSEric Dumazet } 107d4cada4aSEric Dumazet 1086ba5a3c5SPavel Emelyanov int udp_v6_get_port(struct sock *sk, unsigned short snum) 109db8dac20SDavid S. Miller { 11030fff923SEric Dumazet unsigned int hash2_nulladdr = 11130fff923SEric Dumazet udp6_portaddr_hash(sock_net(sk), &in6addr_any, snum); 11230fff923SEric Dumazet unsigned int hash2_partial = 113efe4208fSEric Dumazet udp6_portaddr_hash(sock_net(sk), &sk->sk_v6_rcv_saddr, 0); 11430fff923SEric Dumazet 115d4cada4aSEric Dumazet /* precompute partial secondary hash */ 11630fff923SEric Dumazet udp_sk(sk)->udp_portaddr_hash = hash2_partial; 117fe38d2a1SJosef Bacik return udp_lib_get_port(sk, snum, hash2_nulladdr); 118db8dac20SDavid S. Miller } 119db8dac20SDavid S. Miller 120719f8358SEric Dumazet static void udp_v6_rehash(struct sock *sk) 121719f8358SEric Dumazet { 122719f8358SEric Dumazet u16 new_hash = udp6_portaddr_hash(sock_net(sk), 123efe4208fSEric Dumazet &sk->sk_v6_rcv_saddr, 124719f8358SEric Dumazet inet_sk(sk)->inet_num); 125719f8358SEric Dumazet 126719f8358SEric Dumazet udp_lib_rehash(sk, new_hash); 127719f8358SEric Dumazet } 128719f8358SEric Dumazet 129d1e37288SSu, Xuemin static int compute_score(struct sock *sk, struct net *net, 13088440ae7SBalazs Scheidler const struct in6_addr *saddr, __be16 sport, 131d1e37288SSu, Xuemin const struct in6_addr *daddr, unsigned short hnum, 13263a6fff3SRobert Shearman int dif, bool exact_dif) 133db8dac20SDavid S. Miller { 13460c04aecSJoe Perches int score; 13560c04aecSJoe Perches struct inet_sock *inet; 136db8dac20SDavid S. Miller 13760c04aecSJoe Perches if (!net_eq(sock_net(sk), net) || 13860c04aecSJoe Perches udp_sk(sk)->udp_port_hash != hnum || 13960c04aecSJoe Perches sk->sk_family != PF_INET6) 14060c04aecSJoe Perches return -1; 141645ca708SEric Dumazet 142645ca708SEric Dumazet score = 0; 14360c04aecSJoe Perches inet = inet_sk(sk); 14460c04aecSJoe Perches 145c720c7e8SEric Dumazet if (inet->inet_dport) { 146c720c7e8SEric Dumazet if (inet->inet_dport != sport) 147645ca708SEric Dumazet return -1; 148db8dac20SDavid S. Miller score++; 149db8dac20SDavid S. Miller } 15060c04aecSJoe Perches 151efe4208fSEric Dumazet if (!ipv6_addr_any(&sk->sk_v6_rcv_saddr)) { 152efe4208fSEric Dumazet if (!ipv6_addr_equal(&sk->sk_v6_rcv_saddr, daddr)) 153645ca708SEric Dumazet return -1; 154db8dac20SDavid S. Miller score++; 155db8dac20SDavid S. Miller } 15660c04aecSJoe Perches 157efe4208fSEric Dumazet if (!ipv6_addr_any(&sk->sk_v6_daddr)) { 158efe4208fSEric Dumazet if (!ipv6_addr_equal(&sk->sk_v6_daddr, saddr)) 159645ca708SEric Dumazet return -1; 160db8dac20SDavid S. Miller score++; 161db8dac20SDavid S. Miller } 16260c04aecSJoe Perches 16363a6fff3SRobert Shearman if (sk->sk_bound_dev_if || exact_dif) { 164db8dac20SDavid S. Miller if (sk->sk_bound_dev_if != dif) 165645ca708SEric Dumazet return -1; 166db8dac20SDavid S. Miller score++; 167db8dac20SDavid S. Miller } 16860c04aecSJoe Perches 16970da268bSEric Dumazet if (sk->sk_incoming_cpu == raw_smp_processor_id()) 17070da268bSEric Dumazet score++; 17170da268bSEric Dumazet 172645ca708SEric Dumazet return score; 173645ca708SEric Dumazet } 174645ca708SEric Dumazet 175d1e37288SSu, Xuemin /* called with rcu_read_lock() */ 176fddc17deSEric Dumazet static struct sock *udp6_lib_lookup2(struct net *net, 177fddc17deSEric Dumazet const struct in6_addr *saddr, __be16 sport, 178fddc17deSEric Dumazet const struct in6_addr *daddr, unsigned int hnum, int dif, 17963a6fff3SRobert Shearman bool exact_dif, struct udp_hslot *hslot2, 1801134158bSCraig Gallek struct sk_buff *skb) 181fddc17deSEric Dumazet { 182fddc17deSEric Dumazet struct sock *sk, *result; 18372289b96STom Herbert int score, badness, matches = 0, reuseport = 0; 18472289b96STom Herbert u32 hash = 0; 185fddc17deSEric Dumazet 186fddc17deSEric Dumazet result = NULL; 187fddc17deSEric Dumazet badness = -1; 188ca065d0cSEric Dumazet udp_portaddr_for_each_entry_rcu(sk, &hslot2->head) { 189d1e37288SSu, Xuemin score = compute_score(sk, net, saddr, sport, 19063a6fff3SRobert Shearman daddr, hnum, dif, exact_dif); 191fddc17deSEric Dumazet if (score > badness) { 19272289b96STom Herbert reuseport = sk->sk_reuseport; 19372289b96STom Herbert if (reuseport) { 194b50026b5SHannes Frederic Sowa hash = udp6_ehashfn(net, daddr, hnum, 19572289b96STom Herbert saddr, sport); 196ed0dfffdSEric Dumazet 197ca065d0cSEric Dumazet result = reuseport_select_sock(sk, hash, skb, 1981134158bSCraig Gallek sizeof(struct udphdr)); 199ca065d0cSEric Dumazet if (result) 200ca065d0cSEric Dumazet return result; 20172289b96STom Herbert matches = 1; 20270da268bSEric Dumazet } 203ca065d0cSEric Dumazet result = sk; 204ca065d0cSEric Dumazet badness = score; 20572289b96STom Herbert } else if (score == badness && reuseport) { 20672289b96STom Herbert matches++; 2078fc54f68SDaniel Borkmann if (reciprocal_scale(hash, matches) == 0) 20872289b96STom Herbert result = sk; 20972289b96STom Herbert hash = next_pseudo_random32(hash); 210fddc17deSEric Dumazet } 211fddc17deSEric Dumazet } 212fddc17deSEric Dumazet return result; 213fddc17deSEric Dumazet } 214fddc17deSEric Dumazet 215ca065d0cSEric Dumazet /* rcu_read_lock() must be held */ 216fce82338SPavel Emelyanov struct sock *__udp6_lib_lookup(struct net *net, 21788440ae7SBalazs Scheidler const struct in6_addr *saddr, __be16 sport, 21888440ae7SBalazs Scheidler const struct in6_addr *daddr, __be16 dport, 219538950a1SCraig Gallek int dif, struct udp_table *udptable, 220538950a1SCraig Gallek struct sk_buff *skb) 221645ca708SEric Dumazet { 222271b72c7SEric Dumazet struct sock *sk, *result; 223645ca708SEric Dumazet unsigned short hnum = ntohs(dport); 224fddc17deSEric Dumazet unsigned int hash2, slot2, slot = udp_hashfn(net, hnum, udptable->mask); 225fddc17deSEric Dumazet struct udp_hslot *hslot2, *hslot = &udptable->hash[slot]; 22663a6fff3SRobert Shearman bool exact_dif = udp6_lib_exact_dif_match(net, skb); 22772289b96STom Herbert int score, badness, matches = 0, reuseport = 0; 22872289b96STom Herbert u32 hash = 0; 229645ca708SEric Dumazet 230fddc17deSEric Dumazet if (hslot->count > 10) { 231fddc17deSEric Dumazet hash2 = udp6_portaddr_hash(net, daddr, hnum); 232fddc17deSEric Dumazet slot2 = hash2 & udptable->mask; 233fddc17deSEric Dumazet hslot2 = &udptable->hash2[slot2]; 234fddc17deSEric Dumazet if (hslot->count < hslot2->count) 235fddc17deSEric Dumazet goto begin; 236fddc17deSEric Dumazet 237fddc17deSEric Dumazet result = udp6_lib_lookup2(net, saddr, sport, 23863a6fff3SRobert Shearman daddr, hnum, dif, exact_dif, 239d1e37288SSu, Xuemin hslot2, skb); 240fddc17deSEric Dumazet if (!result) { 241d1e37288SSu, Xuemin unsigned int old_slot2 = slot2; 242fddc17deSEric Dumazet hash2 = udp6_portaddr_hash(net, &in6addr_any, hnum); 243fddc17deSEric Dumazet slot2 = hash2 & udptable->mask; 244d1e37288SSu, Xuemin /* avoid searching the same slot again. */ 245d1e37288SSu, Xuemin if (unlikely(slot2 == old_slot2)) 246d1e37288SSu, Xuemin return result; 247d1e37288SSu, Xuemin 248fddc17deSEric Dumazet hslot2 = &udptable->hash2[slot2]; 249fddc17deSEric Dumazet if (hslot->count < hslot2->count) 250fddc17deSEric Dumazet goto begin; 251fddc17deSEric Dumazet 2521223c67cSJorge Boncompte [DTI2] result = udp6_lib_lookup2(net, saddr, sport, 253d1e37288SSu, Xuemin daddr, hnum, dif, 25463a6fff3SRobert Shearman exact_dif, hslot2, 25563a6fff3SRobert Shearman skb); 256fddc17deSEric Dumazet } 257fddc17deSEric Dumazet return result; 258fddc17deSEric Dumazet } 259271b72c7SEric Dumazet begin: 260271b72c7SEric Dumazet result = NULL; 261271b72c7SEric Dumazet badness = -1; 262ca065d0cSEric Dumazet sk_for_each_rcu(sk, &hslot->head) { 26363a6fff3SRobert Shearman score = compute_score(sk, net, saddr, sport, daddr, hnum, dif, 26463a6fff3SRobert Shearman exact_dif); 265645ca708SEric Dumazet if (score > badness) { 26672289b96STom Herbert reuseport = sk->sk_reuseport; 26772289b96STom Herbert if (reuseport) { 268b50026b5SHannes Frederic Sowa hash = udp6_ehashfn(net, daddr, hnum, 26972289b96STom Herbert saddr, sport); 270ca065d0cSEric Dumazet result = reuseport_select_sock(sk, hash, skb, 271538950a1SCraig Gallek sizeof(struct udphdr)); 272ca065d0cSEric Dumazet if (result) 273ca065d0cSEric Dumazet return result; 27472289b96STom Herbert matches = 1; 27572289b96STom Herbert } 276ca065d0cSEric Dumazet result = sk; 277ca065d0cSEric Dumazet badness = score; 27872289b96STom Herbert } else if (score == badness && reuseport) { 27972289b96STom Herbert matches++; 2808fc54f68SDaniel Borkmann if (reciprocal_scale(hash, matches) == 0) 28172289b96STom Herbert result = sk; 28272289b96STom Herbert hash = next_pseudo_random32(hash); 283db8dac20SDavid S. Miller } 284db8dac20SDavid S. Miller } 285db8dac20SDavid S. Miller return result; 286db8dac20SDavid S. Miller } 287fce82338SPavel Emelyanov EXPORT_SYMBOL_GPL(__udp6_lib_lookup); 288db8dac20SDavid S. Miller 289607c4aafSKOVACS Krisztian static struct sock *__udp6_lib_lookup_skb(struct sk_buff *skb, 290607c4aafSKOVACS Krisztian __be16 sport, __be16 dport, 291645ca708SEric Dumazet struct udp_table *udptable) 292607c4aafSKOVACS Krisztian { 293b71d1d42SEric Dumazet const struct ipv6hdr *iph = ipv6_hdr(skb); 294ed7cbbceSAlexander Duyck struct sock *sk; 295607c4aafSKOVACS Krisztian 296e5d08d71SIan Morris sk = skb_steal_sock(skb); 297e5d08d71SIan Morris if (unlikely(sk)) 29823542618SKOVACS Krisztian return sk; 299ed7cbbceSAlexander Duyck return __udp6_lib_lookup(dev_net(skb->dev), &iph->saddr, sport, 300607c4aafSKOVACS Krisztian &iph->daddr, dport, inet6_iif(skb), 301538950a1SCraig Gallek udptable, skb); 302607c4aafSKOVACS Krisztian } 303607c4aafSKOVACS Krisztian 30463058308STom Herbert struct sock *udp6_lib_lookup_skb(struct sk_buff *skb, 30563058308STom Herbert __be16 sport, __be16 dport) 30663058308STom Herbert { 30763058308STom Herbert const struct ipv6hdr *iph = ipv6_hdr(skb); 30863058308STom Herbert 309ed7cbbceSAlexander Duyck return __udp6_lib_lookup(dev_net(skb->dev), &iph->saddr, sport, 31063058308STom Herbert &iph->daddr, dport, inet6_iif(skb), 31163058308STom Herbert &udp_table, skb); 31263058308STom Herbert } 31363058308STom Herbert EXPORT_SYMBOL_GPL(udp6_lib_lookup_skb); 31463058308STom Herbert 315ca065d0cSEric Dumazet /* Must be called under rcu_read_lock(). 316ca065d0cSEric Dumazet * Does increment socket refcount. 317ca065d0cSEric Dumazet */ 318ca065d0cSEric Dumazet #if IS_ENABLED(CONFIG_NETFILTER_XT_MATCH_SOCKET) || \ 31930f58158SArnd Bergmann IS_ENABLED(CONFIG_NETFILTER_XT_TARGET_TPROXY) || \ 32030f58158SArnd Bergmann IS_ENABLED(CONFIG_NF_SOCKET_IPV6) 321aa976fc0SBalazs Scheidler struct sock *udp6_lib_lookup(struct net *net, const struct in6_addr *saddr, __be16 sport, 322aa976fc0SBalazs Scheidler const struct in6_addr *daddr, __be16 dport, int dif) 323aa976fc0SBalazs Scheidler { 324ca065d0cSEric Dumazet struct sock *sk; 325ca065d0cSEric Dumazet 326ca065d0cSEric Dumazet sk = __udp6_lib_lookup(net, saddr, sport, daddr, dport, 327ca065d0cSEric Dumazet dif, &udp_table, NULL); 328ca065d0cSEric Dumazet if (sk && !atomic_inc_not_zero(&sk->sk_refcnt)) 329ca065d0cSEric Dumazet sk = NULL; 330ca065d0cSEric Dumazet return sk; 331aa976fc0SBalazs Scheidler } 332aa976fc0SBalazs Scheidler EXPORT_SYMBOL_GPL(udp6_lib_lookup); 333ca065d0cSEric Dumazet #endif 334aa976fc0SBalazs Scheidler 335db8dac20SDavid S. Miller /* 336db8dac20SDavid S. Miller * This should be easy, if there is something there we 337db8dac20SDavid S. Miller * return it, otherwise we block. 338db8dac20SDavid S. Miller */ 339db8dac20SDavid S. Miller 3401b784140SYing Xue int udpv6_recvmsg(struct sock *sk, struct msghdr *msg, size_t len, 341db8dac20SDavid S. Miller int noblock, int flags, int *addr_len) 342db8dac20SDavid S. Miller { 343db8dac20SDavid S. Miller struct ipv6_pinfo *np = inet6_sk(sk); 344db8dac20SDavid S. Miller struct inet_sock *inet = inet_sk(sk); 345db8dac20SDavid S. Miller struct sk_buff *skb; 34659c2cdaeSDavid S. Miller unsigned int ulen, copied; 347627d2d6bSsamanthakumar int peeked, peeking, off; 348db8dac20SDavid S. Miller int err; 349db8dac20SDavid S. Miller int is_udplite = IS_UDPLITE(sk); 350197c949eSEric Dumazet bool checksum_valid = false; 351f26ba175SWei Yongjun int is_udp4; 352db8dac20SDavid S. Miller 353db8dac20SDavid S. Miller if (flags & MSG_ERRQUEUE) 35485fbaa75SHannes Frederic Sowa return ipv6_recv_error(sk, msg, len, addr_len); 355db8dac20SDavid S. Miller 3564b340ae2SBrian Haley if (np->rxpmtu && np->rxopt.bits.rxpmtu) 35785fbaa75SHannes Frederic Sowa return ipv6_recv_rxpmtu(sk, msg, len, addr_len); 3584b340ae2SBrian Haley 359db8dac20SDavid S. Miller try_again: 360627d2d6bSsamanthakumar peeking = off = sk_peek_offset(sk, flags); 3617c13f97fSPaolo Abeni skb = __skb_recv_udp(sk, flags, noblock, &peeked, &off, &err); 362db8dac20SDavid S. Miller if (!skb) 363627d2d6bSsamanthakumar return err; 364db8dac20SDavid S. Miller 365e6afc8acSsamanthakumar ulen = skb->len; 36659c2cdaeSDavid S. Miller copied = len; 367627d2d6bSsamanthakumar if (copied > ulen - off) 368627d2d6bSsamanthakumar copied = ulen - off; 36959c2cdaeSDavid S. Miller else if (copied < ulen) 370db8dac20SDavid S. Miller msg->msg_flags |= MSG_TRUNC; 371db8dac20SDavid S. Miller 372f26ba175SWei Yongjun is_udp4 = (skb->protocol == htons(ETH_P_IP)); 373f26ba175SWei Yongjun 374db8dac20SDavid S. Miller /* 375db8dac20SDavid S. Miller * If checksum is needed at all, try to do it while copying the 376db8dac20SDavid S. Miller * data. If the data is truncated, or if we only want a partial 377db8dac20SDavid S. Miller * coverage checksum (UDP-Lite), do it before the copy. 378db8dac20SDavid S. Miller */ 379db8dac20SDavid S. Miller 380d21dbdfeSEric Dumazet if (copied < ulen || peeking || 381d21dbdfeSEric Dumazet (is_udplite && UDP_SKB_CB(skb)->partial_cov)) { 382197c949eSEric Dumazet checksum_valid = !udp_lib_checksum_complete(skb); 383197c949eSEric Dumazet if (!checksum_valid) 384db8dac20SDavid S. Miller goto csum_copy_err; 385db8dac20SDavid S. Miller } 386db8dac20SDavid S. Miller 387197c949eSEric Dumazet if (checksum_valid || skb_csum_unnecessary(skb)) 388627d2d6bSsamanthakumar err = skb_copy_datagram_msg(skb, off, msg, copied); 389db8dac20SDavid S. Miller else { 390627d2d6bSsamanthakumar err = skb_copy_and_csum_datagram_msg(skb, off, msg); 391db8dac20SDavid S. Miller if (err == -EINVAL) 392db8dac20SDavid S. Miller goto csum_copy_err; 393db8dac20SDavid S. Miller } 39422911fc5SEric Dumazet if (unlikely(err)) { 395979402b1SEric Dumazet if (!peeked) { 396979402b1SEric Dumazet atomic_inc(&sk->sk_drops); 397979402b1SEric Dumazet if (is_udp4) 3986aef70a8SEric Dumazet UDP_INC_STATS(sock_net(sk), UDP_MIB_INERRORS, 399979402b1SEric Dumazet is_udplite); 400979402b1SEric Dumazet else 4016aef70a8SEric Dumazet UDP6_INC_STATS(sock_net(sk), UDP_MIB_INERRORS, 402979402b1SEric Dumazet is_udplite); 403979402b1SEric Dumazet } 404850cbaddSPaolo Abeni kfree_skb(skb); 405627d2d6bSsamanthakumar return err; 40622911fc5SEric Dumazet } 407f26ba175SWei Yongjun if (!peeked) { 408f26ba175SWei Yongjun if (is_udp4) 4096aef70a8SEric Dumazet UDP_INC_STATS(sock_net(sk), UDP_MIB_INDATAGRAMS, 4106aef70a8SEric Dumazet is_udplite); 411f26ba175SWei Yongjun else 4126aef70a8SEric Dumazet UDP6_INC_STATS(sock_net(sk), UDP_MIB_INDATAGRAMS, 4136aef70a8SEric Dumazet is_udplite); 414f26ba175SWei Yongjun } 415db8dac20SDavid S. Miller 4163b885787SNeil Horman sock_recv_ts_and_drops(msg, sk, skb); 417db8dac20SDavid S. Miller 418db8dac20SDavid S. Miller /* Copy the address. */ 419db8dac20SDavid S. Miller if (msg->msg_name) { 420342dfc30SSteffen Hurrle DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, msg->msg_name); 421db8dac20SDavid S. Miller sin6->sin6_family = AF_INET6; 422db8dac20SDavid S. Miller sin6->sin6_port = udp_hdr(skb)->source; 423db8dac20SDavid S. Miller sin6->sin6_flowinfo = 0; 424db8dac20SDavid S. Miller 425842df073SHannes Frederic Sowa if (is_udp4) { 426b301e82cSBrian Haley ipv6_addr_set_v4mapped(ip_hdr(skb)->saddr, 427b301e82cSBrian Haley &sin6->sin6_addr); 428842df073SHannes Frederic Sowa sin6->sin6_scope_id = 0; 429842df073SHannes Frederic Sowa } else { 4304e3fd7a0SAlexey Dobriyan sin6->sin6_addr = ipv6_hdr(skb)->saddr; 431842df073SHannes Frederic Sowa sin6->sin6_scope_id = 432842df073SHannes Frederic Sowa ipv6_iface_scope_id(&sin6->sin6_addr, 4334330487aSDuan Jiong inet6_iif(skb)); 434db8dac20SDavid S. Miller } 435bceaa902SHannes Frederic Sowa *addr_len = sizeof(*sin6); 436db8dac20SDavid S. Miller } 4374b261c75SHannes Frederic Sowa 4384b261c75SHannes Frederic Sowa if (np->rxopt.all) 4394b261c75SHannes Frederic Sowa ip6_datagram_recv_common_ctl(sk, msg, skb); 4404b261c75SHannes Frederic Sowa 441f26ba175SWei Yongjun if (is_udp4) { 442db8dac20SDavid S. Miller if (inet->cmsg_flags) 443ad959036SPaolo Abeni ip_cmsg_recv_offset(msg, sk, skb, 44410df8e61SEric Dumazet sizeof(struct udphdr), off); 445db8dac20SDavid S. Miller } else { 446db8dac20SDavid S. Miller if (np->rxopt.all) 4474b261c75SHannes Frederic Sowa ip6_datagram_recv_specific_ctl(sk, msg, skb); 448db8dac20SDavid S. Miller } 449db8dac20SDavid S. Miller 45059c2cdaeSDavid S. Miller err = copied; 451db8dac20SDavid S. Miller if (flags & MSG_TRUNC) 452db8dac20SDavid S. Miller err = ulen; 453db8dac20SDavid S. Miller 454850cbaddSPaolo Abeni skb_consume_udp(sk, skb, peeking ? -err : err); 455db8dac20SDavid S. Miller return err; 456db8dac20SDavid S. Miller 457db8dac20SDavid S. Miller csum_copy_err: 45869629464SEric Dumazet if (!__sk_queue_drop_skb(sk, skb, flags, udp_skb_destructor)) { 4596a5dc9e5SEric Dumazet if (is_udp4) { 4606aef70a8SEric Dumazet UDP_INC_STATS(sock_net(sk), 4616a5dc9e5SEric Dumazet UDP_MIB_CSUMERRORS, is_udplite); 4626aef70a8SEric Dumazet UDP_INC_STATS(sock_net(sk), 4630856f939SWei Yongjun UDP_MIB_INERRORS, is_udplite); 4646a5dc9e5SEric Dumazet } else { 4656aef70a8SEric Dumazet UDP6_INC_STATS(sock_net(sk), 4666a5dc9e5SEric Dumazet UDP_MIB_CSUMERRORS, is_udplite); 4676aef70a8SEric Dumazet UDP6_INC_STATS(sock_net(sk), 4680856f939SWei Yongjun UDP_MIB_INERRORS, is_udplite); 4690856f939SWei Yongjun } 4706a5dc9e5SEric Dumazet } 471850cbaddSPaolo Abeni kfree_skb(skb); 472db8dac20SDavid S. Miller 473beb39db5SEric Dumazet /* starting over for a new packet, but check if we need to yield */ 474beb39db5SEric Dumazet cond_resched(); 4759cfaa8deSXufeng Zhang msg->msg_flags &= ~MSG_TRUNC; 476db8dac20SDavid S. Miller goto try_again; 477db8dac20SDavid S. Miller } 478db8dac20SDavid S. Miller 479db8dac20SDavid S. Miller void __udp6_lib_err(struct sk_buff *skb, struct inet6_skb_parm *opt, 480d5fdd6baSBrian Haley u8 type, u8 code, int offset, __be32 info, 481645ca708SEric Dumazet struct udp_table *udptable) 482db8dac20SDavid S. Miller { 483db8dac20SDavid S. Miller struct ipv6_pinfo *np; 484b71d1d42SEric Dumazet const struct ipv6hdr *hdr = (const struct ipv6hdr *)skb->data; 485b71d1d42SEric Dumazet const struct in6_addr *saddr = &hdr->saddr; 486b71d1d42SEric Dumazet const struct in6_addr *daddr = &hdr->daddr; 487db8dac20SDavid S. Miller struct udphdr *uh = (struct udphdr *)(skb->data+offset); 488db8dac20SDavid S. Miller struct sock *sk; 489e0d8c1b7SWei Wang int harderr; 490db8dac20SDavid S. Miller int err; 4917304fe46SDuan Jiong struct net *net = dev_net(skb->dev); 492db8dac20SDavid S. Miller 493e32ea7e7SCraig Gallek sk = __udp6_lib_lookup(net, daddr, uh->dest, saddr, uh->source, 494538950a1SCraig Gallek inet6_iif(skb), udptable, skb); 49563159f29SIan Morris if (!sk) { 496a16292a0SEric Dumazet __ICMP6_INC_STATS(net, __in6_dev_get(skb->dev), 4977304fe46SDuan Jiong ICMP6_MIB_INERRORS); 498db8dac20SDavid S. Miller return; 4997304fe46SDuan Jiong } 500db8dac20SDavid S. Miller 501e0d8c1b7SWei Wang harderr = icmpv6_err_convert(type, code, &err); 502e0d8c1b7SWei Wang np = inet6_sk(sk); 503e0d8c1b7SWei Wang 50493b36cf3SHannes Frederic Sowa if (type == ICMPV6_PKT_TOOBIG) { 50593b36cf3SHannes Frederic Sowa if (!ip6_sk_accept_pmtu(sk)) 50693b36cf3SHannes Frederic Sowa goto out; 50781aded24SDavid S. Miller ip6_sk_update_pmtu(skb, sk, info); 508e0d8c1b7SWei Wang if (np->pmtudisc != IPV6_PMTUDISC_DONT) 509e0d8c1b7SWei Wang harderr = 1; 51093b36cf3SHannes Frederic Sowa } 5111a462d18SDuan Jiong if (type == NDISC_REDIRECT) { 512ec18d9a2SDavid S. Miller ip6_sk_redirect(skb, sk); 5131a462d18SDuan Jiong goto out; 5141a462d18SDuan Jiong } 51581aded24SDavid S. Miller 516e0d8c1b7SWei Wang if (!np->recverr) { 517e0d8c1b7SWei Wang if (!harderr || sk->sk_state != TCP_ESTABLISHED) 518db8dac20SDavid S. Miller goto out; 519e0d8c1b7SWei Wang } else { 520db8dac20SDavid S. Miller ipv6_icmp_error(sk, skb, err, uh->dest, ntohl(info), (u8 *)(uh+1)); 521e0d8c1b7SWei Wang } 522b1faf566SEric Dumazet 523db8dac20SDavid S. Miller sk->sk_err = err; 524db8dac20SDavid S. Miller sk->sk_error_report(sk); 525db8dac20SDavid S. Miller out: 526ca065d0cSEric Dumazet return; 527db8dac20SDavid S. Miller } 528db8dac20SDavid S. Miller 529a3f96c47SPaolo Abeni static int __udpv6_queue_rcv_skb(struct sock *sk, struct sk_buff *skb) 530f7ad74feSBenjamin LaHaise { 531f7ad74feSBenjamin LaHaise int rc; 532f7ad74feSBenjamin LaHaise 533efe4208fSEric Dumazet if (!ipv6_addr_any(&sk->sk_v6_daddr)) { 534f7ad74feSBenjamin LaHaise sock_rps_save_rxhash(sk, skb); 535005ec974SShawn Bohrer sk_mark_napi_id(sk, skb); 5362c8c56e1SEric Dumazet sk_incoming_cpu_update(sk); 537e68b6e50SEric Dumazet } else { 538e68b6e50SEric Dumazet sk_mark_napi_id_once(sk, skb); 539005ec974SShawn Bohrer } 540f7ad74feSBenjamin LaHaise 541850cbaddSPaolo Abeni rc = __udp_enqueue_schedule_skb(sk, skb); 542f7ad74feSBenjamin LaHaise if (rc < 0) { 543f7ad74feSBenjamin LaHaise int is_udplite = IS_UDPLITE(sk); 544f7ad74feSBenjamin LaHaise 545f7ad74feSBenjamin LaHaise /* Note that an ENOMEM error is charged twice */ 546f7ad74feSBenjamin LaHaise if (rc == -ENOMEM) 547e61da9e2SEric Dumazet UDP6_INC_STATS(sock_net(sk), 548f7ad74feSBenjamin LaHaise UDP_MIB_RCVBUFERRORS, is_udplite); 549e61da9e2SEric Dumazet UDP6_INC_STATS(sock_net(sk), UDP_MIB_INERRORS, is_udplite); 550f7ad74feSBenjamin LaHaise kfree_skb(skb); 551f7ad74feSBenjamin LaHaise return -1; 552f7ad74feSBenjamin LaHaise } 553850cbaddSPaolo Abeni 554f7ad74feSBenjamin LaHaise return 0; 555f7ad74feSBenjamin LaHaise } 556f7ad74feSBenjamin LaHaise 557db8dac20SDavid S. Miller static __inline__ void udpv6_err(struct sk_buff *skb, 558d5fdd6baSBrian Haley struct inet6_skb_parm *opt, u8 type, 559d5fdd6baSBrian Haley u8 code, int offset, __be32 info) 560db8dac20SDavid S. Miller { 561645ca708SEric Dumazet __udp6_lib_err(skb, opt, type, code, offset, info, &udp_table); 562db8dac20SDavid S. Miller } 563db8dac20SDavid S. Miller 564d7f3f621SBenjamin LaHaise static struct static_key udpv6_encap_needed __read_mostly; 565d7f3f621SBenjamin LaHaise void udpv6_encap_enable(void) 566d7f3f621SBenjamin LaHaise { 567d7f3f621SBenjamin LaHaise if (!static_key_enabled(&udpv6_encap_needed)) 568d7f3f621SBenjamin LaHaise static_key_slow_inc(&udpv6_encap_needed); 569d7f3f621SBenjamin LaHaise } 570d7f3f621SBenjamin LaHaise EXPORT_SYMBOL(udpv6_encap_enable); 571d7f3f621SBenjamin LaHaise 572a3f96c47SPaolo Abeni static int udpv6_queue_rcv_skb(struct sock *sk, struct sk_buff *skb) 573db8dac20SDavid S. Miller { 574db8dac20SDavid S. Miller struct udp_sock *up = udp_sk(sk); 575db8dac20SDavid S. Miller int is_udplite = IS_UDPLITE(sk); 576db8dac20SDavid S. Miller 577db8dac20SDavid S. Miller if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb)) 578db8dac20SDavid S. Miller goto drop; 579db8dac20SDavid S. Miller 580d7f3f621SBenjamin LaHaise if (static_key_false(&udpv6_encap_needed) && up->encap_type) { 581d7f3f621SBenjamin LaHaise int (*encap_rcv)(struct sock *sk, struct sk_buff *skb); 582d7f3f621SBenjamin LaHaise 583d7f3f621SBenjamin LaHaise /* 584d7f3f621SBenjamin LaHaise * This is an encapsulation socket so pass the skb to 585d7f3f621SBenjamin LaHaise * the socket's udp_encap_rcv() hook. Otherwise, just 586d7f3f621SBenjamin LaHaise * fall through and pass this up the UDP socket. 587d7f3f621SBenjamin LaHaise * up->encap_rcv() returns the following value: 588d7f3f621SBenjamin LaHaise * =0 if skb was successfully passed to the encap 589d7f3f621SBenjamin LaHaise * handler or was discarded by it. 590d7f3f621SBenjamin LaHaise * >0 if skb should be passed on to UDP. 591d7f3f621SBenjamin LaHaise * <0 if skb should be resubmitted as proto -N 592d7f3f621SBenjamin LaHaise */ 593d7f3f621SBenjamin LaHaise 594d7f3f621SBenjamin LaHaise /* if we're overly short, let UDP handle it */ 595d7f3f621SBenjamin LaHaise encap_rcv = ACCESS_ONCE(up->encap_rcv); 596e5aed006SHannes Frederic Sowa if (encap_rcv) { 597d7f3f621SBenjamin LaHaise int ret; 598d7f3f621SBenjamin LaHaise 5990a80966bSTom Herbert /* Verify checksum before giving to encap */ 6000a80966bSTom Herbert if (udp_lib_checksum_complete(skb)) 6010a80966bSTom Herbert goto csum_error; 6020a80966bSTom Herbert 603d7f3f621SBenjamin LaHaise ret = encap_rcv(sk, skb); 604d7f3f621SBenjamin LaHaise if (ret <= 0) { 60502c22347SEric Dumazet __UDP_INC_STATS(sock_net(sk), 606d7f3f621SBenjamin LaHaise UDP_MIB_INDATAGRAMS, 607d7f3f621SBenjamin LaHaise is_udplite); 608d7f3f621SBenjamin LaHaise return -ret; 609d7f3f621SBenjamin LaHaise } 610d7f3f621SBenjamin LaHaise } 611d7f3f621SBenjamin LaHaise 612d7f3f621SBenjamin LaHaise /* FALLTHROUGH -- it's a UDP Packet */ 613d7f3f621SBenjamin LaHaise } 614d7f3f621SBenjamin LaHaise 615db8dac20SDavid S. Miller /* 616db8dac20SDavid S. Miller * UDP-Lite specific tests, ignored on UDP sockets (see net/ipv4/udp.c). 617db8dac20SDavid S. Miller */ 618db8dac20SDavid S. Miller if ((is_udplite & UDPLITE_RECV_CC) && UDP_SKB_CB(skb)->partial_cov) { 619db8dac20SDavid S. Miller 620db8dac20SDavid S. Miller if (up->pcrlen == 0) { /* full coverage was set */ 621ba7a46f1SJoe Perches net_dbg_ratelimited("UDPLITE6: partial coverage %d while full coverage %d requested\n", 622db8dac20SDavid S. Miller UDP_SKB_CB(skb)->cscov, skb->len); 623db8dac20SDavid S. Miller goto drop; 624db8dac20SDavid S. Miller } 625db8dac20SDavid S. Miller if (UDP_SKB_CB(skb)->cscov < up->pcrlen) { 626ba7a46f1SJoe Perches net_dbg_ratelimited("UDPLITE6: coverage %d too small, need min %d\n", 627db8dac20SDavid S. Miller UDP_SKB_CB(skb)->cscov, up->pcrlen); 628db8dac20SDavid S. Miller goto drop; 629db8dac20SDavid S. Miller } 630db8dac20SDavid S. Miller } 631db8dac20SDavid S. Miller 632ce25d66aSEric Dumazet if (rcu_access_pointer(sk->sk_filter) && 633ce25d66aSEric Dumazet udp_lib_checksum_complete(skb)) 6346a5dc9e5SEric Dumazet goto csum_error; 635ce25d66aSEric Dumazet 636ba66bbe5SDaniel Borkmann if (sk_filter_trim_cap(sk, skb, sizeof(struct udphdr))) 637a6127697SMichal Kubeček goto drop; 638db8dac20SDavid S. Miller 639e6afc8acSsamanthakumar udp_csum_pull_header(skb); 640cb80ef46SBenjamin LaHaise 641d826eb14SEric Dumazet skb_dst_drop(skb); 642db8dac20SDavid S. Miller 643850cbaddSPaolo Abeni return __udpv6_queue_rcv_skb(sk, skb); 6443e215c8dSJames M Leddy 6456a5dc9e5SEric Dumazet csum_error: 64602c22347SEric Dumazet __UDP6_INC_STATS(sock_net(sk), UDP_MIB_CSUMERRORS, is_udplite); 647db8dac20SDavid S. Miller drop: 64802c22347SEric Dumazet __UDP6_INC_STATS(sock_net(sk), UDP_MIB_INERRORS, is_udplite); 649cb80ef46SBenjamin LaHaise atomic_inc(&sk->sk_drops); 650db8dac20SDavid S. Miller kfree_skb(skb); 651db8dac20SDavid S. Miller return -1; 652db8dac20SDavid S. Miller } 653db8dac20SDavid S. Miller 6545cf3d461SDavid Held static bool __udp_v6_is_mcast_sock(struct net *net, struct sock *sk, 655b71d1d42SEric Dumazet __be16 loc_port, const struct in6_addr *loc_addr, 656b71d1d42SEric Dumazet __be16 rmt_port, const struct in6_addr *rmt_addr, 6575cf3d461SDavid Held int dif, unsigned short hnum) 658db8dac20SDavid S. Miller { 6599e89fd8bSSven Wegener struct inet_sock *inet = inet_sk(sk); 660db8dac20SDavid S. Miller 6619e89fd8bSSven Wegener if (!net_eq(sock_net(sk), net)) 6625cf3d461SDavid Held return false; 663b8ad0cbcSDaniel Lezcano 6645cf3d461SDavid Held if (udp_sk(sk)->udp_port_hash != hnum || 6655cf3d461SDavid Held sk->sk_family != PF_INET6 || 6665cf3d461SDavid Held (inet->inet_dport && inet->inet_dport != rmt_port) || 6675cf3d461SDavid Held (!ipv6_addr_any(&sk->sk_v6_daddr) && 6685cf3d461SDavid Held !ipv6_addr_equal(&sk->sk_v6_daddr, rmt_addr)) || 66933b4b015SHenning Rogge (sk->sk_bound_dev_if && sk->sk_bound_dev_if != dif) || 67033b4b015SHenning Rogge (!ipv6_addr_any(&sk->sk_v6_rcv_saddr) && 67133b4b015SHenning Rogge !ipv6_addr_equal(&sk->sk_v6_rcv_saddr, loc_addr))) 6725cf3d461SDavid Held return false; 6739e89fd8bSSven Wegener if (!inet6_mc_check(sk, loc_addr, rmt_addr)) 6745cf3d461SDavid Held return false; 6755cf3d461SDavid Held return true; 676db8dac20SDavid S. Miller } 677db8dac20SDavid S. Miller 6784068579eSTom Herbert static void udp6_csum_zero_error(struct sk_buff *skb) 6794068579eSTom Herbert { 6804068579eSTom Herbert /* RFC 2460 section 8.1 says that we SHOULD log 6814068579eSTom Herbert * this error. Well, it is reasonable. 6824068579eSTom Herbert */ 683ba7a46f1SJoe Perches net_dbg_ratelimited("IPv6: udp checksum is 0 for [%pI6c]:%u->[%pI6c]:%u\n", 6844068579eSTom Herbert &ipv6_hdr(skb)->saddr, ntohs(udp_hdr(skb)->source), 6854068579eSTom Herbert &ipv6_hdr(skb)->daddr, ntohs(udp_hdr(skb)->dest)); 6864068579eSTom Herbert } 6874068579eSTom Herbert 688db8dac20SDavid S. Miller /* 689db8dac20SDavid S. Miller * Note: called only from the BH handler context, 690db8dac20SDavid S. Miller * so we don't need to lock the hashes. 691db8dac20SDavid S. Miller */ 692e3163493SPavel Emelyanov static int __udp6_lib_mcast_deliver(struct net *net, struct sk_buff *skb, 693b71d1d42SEric Dumazet const struct in6_addr *saddr, const struct in6_addr *daddr, 69436cbb245SRick Jones struct udp_table *udptable, int proto) 695db8dac20SDavid S. Miller { 696ca065d0cSEric Dumazet struct sock *sk, *first = NULL; 697db8dac20SDavid S. Miller const struct udphdr *uh = udp_hdr(skb); 6985cf3d461SDavid Held unsigned short hnum = ntohs(uh->dest); 6995cf3d461SDavid Held struct udp_hslot *hslot = udp_hashslot(udptable, net, hnum); 700ca065d0cSEric Dumazet unsigned int offset = offsetof(typeof(*sk), sk_node); 7012dc41cffSDavid Held unsigned int hash2 = 0, hash2_any = 0, use_hash2 = (hslot->count > 10); 702ca065d0cSEric Dumazet int dif = inet6_iif(skb); 703ca065d0cSEric Dumazet struct hlist_node *node; 704ca065d0cSEric Dumazet struct sk_buff *nskb; 7052dc41cffSDavid Held 7062dc41cffSDavid Held if (use_hash2) { 7072dc41cffSDavid Held hash2_any = udp6_portaddr_hash(net, &in6addr_any, hnum) & 70873e2d5e3SPablo Neira udptable->mask; 70973e2d5e3SPablo Neira hash2 = udp6_portaddr_hash(net, daddr, hnum) & udptable->mask; 7102dc41cffSDavid Held start_lookup: 71173e2d5e3SPablo Neira hslot = &udptable->hash2[hash2]; 7122dc41cffSDavid Held offset = offsetof(typeof(*sk), __sk_common.skc_portaddr_node); 7132dc41cffSDavid Held } 714db8dac20SDavid S. Miller 715ca065d0cSEric Dumazet sk_for_each_entry_offset_rcu(sk, node, &hslot->head, offset) { 716ca065d0cSEric Dumazet if (!__udp_v6_is_mcast_sock(net, sk, uh->dest, daddr, 717ca065d0cSEric Dumazet uh->source, saddr, dif, hnum)) 718ca065d0cSEric Dumazet continue; 7191c19448cSTom Herbert /* If zero checksum and no_check is not on for 7204068579eSTom Herbert * the socket then skip it. 7214068579eSTom Herbert */ 722ca065d0cSEric Dumazet if (!uh->check && !udp_sk(sk)->no_check6_rx) 723ca065d0cSEric Dumazet continue; 724ca065d0cSEric Dumazet if (!first) { 725ca065d0cSEric Dumazet first = sk; 726ca065d0cSEric Dumazet continue; 727db8dac20SDavid S. Miller } 728ca065d0cSEric Dumazet nskb = skb_clone(skb, GFP_ATOMIC); 729ca065d0cSEric Dumazet if (unlikely(!nskb)) { 730ca065d0cSEric Dumazet atomic_inc(&sk->sk_drops); 73102c22347SEric Dumazet __UDP6_INC_STATS(net, UDP_MIB_RCVBUFERRORS, 732ca065d0cSEric Dumazet IS_UDPLITE(sk)); 73302c22347SEric Dumazet __UDP6_INC_STATS(net, UDP_MIB_INERRORS, 734ca065d0cSEric Dumazet IS_UDPLITE(sk)); 735ca065d0cSEric Dumazet continue; 736a1ab77f9SEric Dumazet } 737db8dac20SDavid S. Miller 738ca065d0cSEric Dumazet if (udpv6_queue_rcv_skb(sk, nskb) > 0) 739ca065d0cSEric Dumazet consume_skb(nskb); 740ca065d0cSEric Dumazet } 741a1ab77f9SEric Dumazet 7422dc41cffSDavid Held /* Also lookup *:port if we are using hash2 and haven't done so yet. */ 7432dc41cffSDavid Held if (use_hash2 && hash2 != hash2_any) { 7442dc41cffSDavid Held hash2 = hash2_any; 7452dc41cffSDavid Held goto start_lookup; 7462dc41cffSDavid Held } 7472dc41cffSDavid Held 748ca065d0cSEric Dumazet if (first) { 749ca065d0cSEric Dumazet if (udpv6_queue_rcv_skb(first, skb) > 0) 750ca065d0cSEric Dumazet consume_skb(skb); 751a1ab77f9SEric Dumazet } else { 752ca065d0cSEric Dumazet kfree_skb(skb); 75302c22347SEric Dumazet __UDP6_INC_STATS(net, UDP_MIB_IGNOREDMULTI, 75436cbb245SRick Jones proto == IPPROTO_UDPLITE); 755a1ab77f9SEric Dumazet } 756db8dac20SDavid S. Miller return 0; 757db8dac20SDavid S. Miller } 758db8dac20SDavid S. Miller 759645ca708SEric Dumazet int __udp6_lib_rcv(struct sk_buff *skb, struct udp_table *udptable, 760db8dac20SDavid S. Miller int proto) 761db8dac20SDavid S. Miller { 762b71d1d42SEric Dumazet const struct in6_addr *saddr, *daddr; 763ca065d0cSEric Dumazet struct net *net = dev_net(skb->dev); 764ca065d0cSEric Dumazet struct udphdr *uh; 765ca065d0cSEric Dumazet struct sock *sk; 766db8dac20SDavid S. Miller u32 ulen = 0; 767db8dac20SDavid S. Miller 768db8dac20SDavid S. Miller if (!pskb_may_pull(skb, sizeof(struct udphdr))) 769d6bc0149SBjørn Mork goto discard; 770db8dac20SDavid S. Miller 771db8dac20SDavid S. Miller saddr = &ipv6_hdr(skb)->saddr; 772db8dac20SDavid S. Miller daddr = &ipv6_hdr(skb)->daddr; 773db8dac20SDavid S. Miller uh = udp_hdr(skb); 774db8dac20SDavid S. Miller 775db8dac20SDavid S. Miller ulen = ntohs(uh->len); 776db8dac20SDavid S. Miller if (ulen > skb->len) 777db8dac20SDavid S. Miller goto short_packet; 778db8dac20SDavid S. Miller 779db8dac20SDavid S. Miller if (proto == IPPROTO_UDP) { 780db8dac20SDavid S. Miller /* UDP validates ulen. */ 781db8dac20SDavid S. Miller 782db8dac20SDavid S. Miller /* Check for jumbo payload */ 783db8dac20SDavid S. Miller if (ulen == 0) 784db8dac20SDavid S. Miller ulen = skb->len; 785db8dac20SDavid S. Miller 786db8dac20SDavid S. Miller if (ulen < sizeof(*uh)) 787db8dac20SDavid S. Miller goto short_packet; 788db8dac20SDavid S. Miller 789db8dac20SDavid S. Miller if (ulen < skb->len) { 790db8dac20SDavid S. Miller if (pskb_trim_rcsum(skb, ulen)) 791db8dac20SDavid S. Miller goto short_packet; 792db8dac20SDavid S. Miller saddr = &ipv6_hdr(skb)->saddr; 793db8dac20SDavid S. Miller daddr = &ipv6_hdr(skb)->daddr; 794db8dac20SDavid S. Miller uh = udp_hdr(skb); 795db8dac20SDavid S. Miller } 796db8dac20SDavid S. Miller } 797db8dac20SDavid S. Miller 798db8dac20SDavid S. Miller if (udp6_csum_init(skb, uh, proto)) 7996a5dc9e5SEric Dumazet goto csum_error; 800db8dac20SDavid S. Miller 801db8dac20SDavid S. Miller /* 802db8dac20SDavid S. Miller * Multicast receive code 803db8dac20SDavid S. Miller */ 804db8dac20SDavid S. Miller if (ipv6_addr_is_multicast(daddr)) 805e3163493SPavel Emelyanov return __udp6_lib_mcast_deliver(net, skb, 80636cbb245SRick Jones saddr, daddr, udptable, proto); 807db8dac20SDavid S. Miller 808db8dac20SDavid S. Miller /* Unicast */ 809db8dac20SDavid S. Miller 810db8dac20SDavid S. Miller /* 811db8dac20SDavid S. Miller * check socket cache ... must talk to Alan about his plans 812db8dac20SDavid S. Miller * for sock caches... i'll skip this for now. 813db8dac20SDavid S. Miller */ 814607c4aafSKOVACS Krisztian sk = __udp6_lib_lookup_skb(skb, uh->source, uh->dest, udptable); 81553b24b8fSIan Morris if (sk) { 816a5b50476SEliezer Tamir int ret; 817a5b50476SEliezer Tamir 8181c19448cSTom Herbert if (!uh->check && !udp_sk(sk)->no_check6_rx) { 8194068579eSTom Herbert udp6_csum_zero_error(skb); 8204068579eSTom Herbert goto csum_error; 8214068579eSTom Herbert } 8224068579eSTom Herbert 823224d019cSTom Herbert if (inet_get_convert_csum(sk) && uh->check && !IS_UDPLITE(sk)) 8242abb7cdcSTom Herbert skb_checksum_try_convert(skb, IPPROTO_UDP, uh->check, 8252abb7cdcSTom Herbert ip6_compute_pseudo); 8262abb7cdcSTom Herbert 827a5b50476SEliezer Tamir ret = udpv6_queue_rcv_skb(sk, skb); 828db8dac20SDavid S. Miller 82959dca1d8SBill Sommerfeld /* a return value > 0 means to resubmit the input */ 830cb80ef46SBenjamin LaHaise if (ret > 0) 83159dca1d8SBill Sommerfeld return ret; 832cb80ef46SBenjamin LaHaise 833cb80ef46SBenjamin LaHaise return 0; 834cb80ef46SBenjamin LaHaise } 835cb80ef46SBenjamin LaHaise 8364068579eSTom Herbert if (!uh->check) { 8374068579eSTom Herbert udp6_csum_zero_error(skb); 8384068579eSTom Herbert goto csum_error; 8394068579eSTom Herbert } 8404068579eSTom Herbert 841db8dac20SDavid S. Miller if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) 842db8dac20SDavid S. Miller goto discard; 843db8dac20SDavid S. Miller 844db8dac20SDavid S. Miller if (udp_lib_checksum_complete(skb)) 8456a5dc9e5SEric Dumazet goto csum_error; 846db8dac20SDavid S. Miller 84702c22347SEric Dumazet __UDP6_INC_STATS(net, UDP_MIB_NOPORTS, proto == IPPROTO_UDPLITE); 8483ffe533cSAlexey Dobriyan icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0); 849db8dac20SDavid S. Miller 850db8dac20SDavid S. Miller kfree_skb(skb); 851db8dac20SDavid S. Miller return 0; 852db8dac20SDavid S. Miller 853db8dac20SDavid S. Miller short_packet: 854ba7a46f1SJoe Perches net_dbg_ratelimited("UDP%sv6: short packet: From [%pI6c]:%u %d/%d to [%pI6c]:%u\n", 855db8dac20SDavid S. Miller proto == IPPROTO_UDPLITE ? "-Lite" : "", 856ba7a46f1SJoe Perches saddr, ntohs(uh->source), 857ba7a46f1SJoe Perches ulen, skb->len, 858ba7a46f1SJoe Perches daddr, ntohs(uh->dest)); 8596a5dc9e5SEric Dumazet goto discard; 8606a5dc9e5SEric Dumazet csum_error: 86102c22347SEric Dumazet __UDP6_INC_STATS(net, UDP_MIB_CSUMERRORS, proto == IPPROTO_UDPLITE); 862db8dac20SDavid S. Miller discard: 86302c22347SEric Dumazet __UDP6_INC_STATS(net, UDP_MIB_INERRORS, proto == IPPROTO_UDPLITE); 864db8dac20SDavid S. Miller kfree_skb(skb); 865db8dac20SDavid S. Miller return 0; 866db8dac20SDavid S. Miller } 867db8dac20SDavid S. Miller 8680bd84065Ssubashab@codeaurora.org 8695425077dSsubashab@codeaurora.org static struct sock *__udp6_lib_demux_lookup(struct net *net, 8705425077dSsubashab@codeaurora.org __be16 loc_port, const struct in6_addr *loc_addr, 8715425077dSsubashab@codeaurora.org __be16 rmt_port, const struct in6_addr *rmt_addr, 8725425077dSsubashab@codeaurora.org int dif) 8735425077dSsubashab@codeaurora.org { 8740bd84065Ssubashab@codeaurora.org unsigned short hnum = ntohs(loc_port); 8750bd84065Ssubashab@codeaurora.org unsigned int hash2 = udp6_portaddr_hash(net, loc_addr, hnum); 8760bd84065Ssubashab@codeaurora.org unsigned int slot2 = hash2 & udp_table.mask; 8770bd84065Ssubashab@codeaurora.org struct udp_hslot *hslot2 = &udp_table.hash2[slot2]; 8780bd84065Ssubashab@codeaurora.org const __portpair ports = INET_COMBINED_PORTS(rmt_port, hnum); 8795425077dSsubashab@codeaurora.org struct sock *sk; 8805425077dSsubashab@codeaurora.org 8810bd84065Ssubashab@codeaurora.org udp_portaddr_for_each_entry_rcu(sk, &hslot2->head) { 8820bd84065Ssubashab@codeaurora.org if (INET6_MATCH(sk, net, rmt_addr, loc_addr, ports, dif)) 8835425077dSsubashab@codeaurora.org return sk; 8840bd84065Ssubashab@codeaurora.org /* Only check first socket in chain */ 8850bd84065Ssubashab@codeaurora.org break; 8860bd84065Ssubashab@codeaurora.org } 8870bd84065Ssubashab@codeaurora.org return NULL; 8885425077dSsubashab@codeaurora.org } 8895425077dSsubashab@codeaurora.org 8905425077dSsubashab@codeaurora.org static void udp_v6_early_demux(struct sk_buff *skb) 8915425077dSsubashab@codeaurora.org { 8925425077dSsubashab@codeaurora.org struct net *net = dev_net(skb->dev); 8935425077dSsubashab@codeaurora.org const struct udphdr *uh; 8945425077dSsubashab@codeaurora.org struct sock *sk; 8955425077dSsubashab@codeaurora.org struct dst_entry *dst; 8965425077dSsubashab@codeaurora.org int dif = skb->dev->ifindex; 8975425077dSsubashab@codeaurora.org 8985425077dSsubashab@codeaurora.org if (!pskb_may_pull(skb, skb_transport_offset(skb) + 8995425077dSsubashab@codeaurora.org sizeof(struct udphdr))) 9005425077dSsubashab@codeaurora.org return; 9015425077dSsubashab@codeaurora.org 9025425077dSsubashab@codeaurora.org uh = udp_hdr(skb); 9035425077dSsubashab@codeaurora.org 9045425077dSsubashab@codeaurora.org if (skb->pkt_type == PACKET_HOST) 9055425077dSsubashab@codeaurora.org sk = __udp6_lib_demux_lookup(net, uh->dest, 9065425077dSsubashab@codeaurora.org &ipv6_hdr(skb)->daddr, 9075425077dSsubashab@codeaurora.org uh->source, &ipv6_hdr(skb)->saddr, 9085425077dSsubashab@codeaurora.org dif); 9095425077dSsubashab@codeaurora.org else 9105425077dSsubashab@codeaurora.org return; 9115425077dSsubashab@codeaurora.org 9120bd84065Ssubashab@codeaurora.org if (!sk || !atomic_inc_not_zero_hint(&sk->sk_refcnt, 2)) 9135425077dSsubashab@codeaurora.org return; 9145425077dSsubashab@codeaurora.org 9155425077dSsubashab@codeaurora.org skb->sk = sk; 9165425077dSsubashab@codeaurora.org skb->destructor = sock_efree; 9175425077dSsubashab@codeaurora.org dst = READ_ONCE(sk->sk_rx_dst); 9185425077dSsubashab@codeaurora.org 9195425077dSsubashab@codeaurora.org if (dst) 9205425077dSsubashab@codeaurora.org dst = dst_check(dst, inet6_sk(sk)->rx_dst_cookie); 9215425077dSsubashab@codeaurora.org if (dst) { 9225425077dSsubashab@codeaurora.org if (dst->flags & DST_NOCACHE) { 9235425077dSsubashab@codeaurora.org if (likely(atomic_inc_not_zero(&dst->__refcnt))) 9245425077dSsubashab@codeaurora.org skb_dst_set(skb, dst); 9255425077dSsubashab@codeaurora.org } else { 9265425077dSsubashab@codeaurora.org skb_dst_set_noref(skb, dst); 9275425077dSsubashab@codeaurora.org } 9285425077dSsubashab@codeaurora.org } 9295425077dSsubashab@codeaurora.org } 9305425077dSsubashab@codeaurora.org 931db8dac20SDavid S. Miller static __inline__ int udpv6_rcv(struct sk_buff *skb) 932db8dac20SDavid S. Miller { 933645ca708SEric Dumazet return __udp6_lib_rcv(skb, &udp_table, IPPROTO_UDP); 934db8dac20SDavid S. Miller } 935db8dac20SDavid S. Miller 936db8dac20SDavid S. Miller /* 937db8dac20SDavid S. Miller * Throw away all pending data and cancel the corking. Socket is locked. 938db8dac20SDavid S. Miller */ 939db8dac20SDavid S. Miller static void udp_v6_flush_pending_frames(struct sock *sk) 940db8dac20SDavid S. Miller { 941db8dac20SDavid S. Miller struct udp_sock *up = udp_sk(sk); 942db8dac20SDavid S. Miller 94336d926b9SDenis V. Lunev if (up->pending == AF_INET) 94436d926b9SDenis V. Lunev udp_flush_pending_frames(sk); 94536d926b9SDenis V. Lunev else if (up->pending) { 946db8dac20SDavid S. Miller up->len = 0; 947db8dac20SDavid S. Miller up->pending = 0; 948db8dac20SDavid S. Miller ip6_flush_pending_frames(sk); 949db8dac20SDavid S. Miller } 950db8dac20SDavid S. Miller } 951db8dac20SDavid S. Miller 952493c6be3SSridhar Samudrala /** 953493c6be3SSridhar Samudrala * udp6_hwcsum_outgoing - handle outgoing HW checksumming 954493c6be3SSridhar Samudrala * @sk: socket we are sending on 955493c6be3SSridhar Samudrala * @skb: sk_buff containing the filled-in UDP header 956493c6be3SSridhar Samudrala * (checksum field must be zeroed out) 957493c6be3SSridhar Samudrala */ 958493c6be3SSridhar Samudrala static void udp6_hwcsum_outgoing(struct sock *sk, struct sk_buff *skb, 959493c6be3SSridhar Samudrala const struct in6_addr *saddr, 960493c6be3SSridhar Samudrala const struct in6_addr *daddr, int len) 961493c6be3SSridhar Samudrala { 962493c6be3SSridhar Samudrala unsigned int offset; 963493c6be3SSridhar Samudrala struct udphdr *uh = udp_hdr(skb); 964d39d938cSVlad Yasevich struct sk_buff *frags = skb_shinfo(skb)->frag_list; 965493c6be3SSridhar Samudrala __wsum csum = 0; 966493c6be3SSridhar Samudrala 967d39d938cSVlad Yasevich if (!frags) { 968493c6be3SSridhar Samudrala /* Only one fragment on the socket. */ 969493c6be3SSridhar Samudrala skb->csum_start = skb_transport_header(skb) - skb->head; 970493c6be3SSridhar Samudrala skb->csum_offset = offsetof(struct udphdr, check); 971493c6be3SSridhar Samudrala uh->check = ~csum_ipv6_magic(saddr, daddr, len, IPPROTO_UDP, 0); 972493c6be3SSridhar Samudrala } else { 973493c6be3SSridhar Samudrala /* 974493c6be3SSridhar Samudrala * HW-checksum won't work as there are two or more 975493c6be3SSridhar Samudrala * fragments on the socket so that all csums of sk_buffs 976493c6be3SSridhar Samudrala * should be together 977493c6be3SSridhar Samudrala */ 978493c6be3SSridhar Samudrala offset = skb_transport_offset(skb); 979493c6be3SSridhar Samudrala skb->csum = skb_checksum(skb, offset, skb->len - offset, 0); 980493c6be3SSridhar Samudrala 981493c6be3SSridhar Samudrala skb->ip_summed = CHECKSUM_NONE; 982493c6be3SSridhar Samudrala 983d39d938cSVlad Yasevich do { 984d39d938cSVlad Yasevich csum = csum_add(csum, frags->csum); 985d39d938cSVlad Yasevich } while ((frags = frags->next)); 986493c6be3SSridhar Samudrala 987493c6be3SSridhar Samudrala uh->check = csum_ipv6_magic(saddr, daddr, len, IPPROTO_UDP, 988493c6be3SSridhar Samudrala csum); 989493c6be3SSridhar Samudrala if (uh->check == 0) 990493c6be3SSridhar Samudrala uh->check = CSUM_MANGLED_0; 991493c6be3SSridhar Samudrala } 992493c6be3SSridhar Samudrala } 993493c6be3SSridhar Samudrala 994db8dac20SDavid S. Miller /* 995db8dac20SDavid S. Miller * Sending 996db8dac20SDavid S. Miller */ 997db8dac20SDavid S. Miller 998d39d938cSVlad Yasevich static int udp_v6_send_skb(struct sk_buff *skb, struct flowi6 *fl6) 999db8dac20SDavid S. Miller { 1000d39d938cSVlad Yasevich struct sock *sk = skb->sk; 1001db8dac20SDavid S. Miller struct udphdr *uh; 1002db8dac20SDavid S. Miller int err = 0; 1003db8dac20SDavid S. Miller int is_udplite = IS_UDPLITE(sk); 1004db8dac20SDavid S. Miller __wsum csum = 0; 1005d39d938cSVlad Yasevich int offset = skb_transport_offset(skb); 1006d39d938cSVlad Yasevich int len = skb->len - offset; 1007db8dac20SDavid S. Miller 1008db8dac20SDavid S. Miller /* 1009db8dac20SDavid S. Miller * Create a UDP header 1010db8dac20SDavid S. Miller */ 1011db8dac20SDavid S. Miller uh = udp_hdr(skb); 10121958b856SDavid S. Miller uh->source = fl6->fl6_sport; 10131958b856SDavid S. Miller uh->dest = fl6->fl6_dport; 1014d39d938cSVlad Yasevich uh->len = htons(len); 1015db8dac20SDavid S. Miller uh->check = 0; 1016db8dac20SDavid S. Miller 1017db8dac20SDavid S. Miller if (is_udplite) 1018d39d938cSVlad Yasevich csum = udplite_csum(skb); 1019d39d938cSVlad Yasevich else if (udp_sk(sk)->no_check6_tx) { /* UDP csum disabled */ 10204068579eSTom Herbert skb->ip_summed = CHECKSUM_NONE; 10214068579eSTom Herbert goto send; 10224068579eSTom Herbert } else if (skb->ip_summed == CHECKSUM_PARTIAL) { /* UDP hardware csum */ 1023d39d938cSVlad Yasevich udp6_hwcsum_outgoing(sk, skb, &fl6->saddr, &fl6->daddr, len); 1024493c6be3SSridhar Samudrala goto send; 1025493c6be3SSridhar Samudrala } else 1026d39d938cSVlad Yasevich csum = udp_csum(skb); 1027db8dac20SDavid S. Miller 1028db8dac20SDavid S. Miller /* add protocol-dependent pseudo-header */ 10294c9483b2SDavid S. Miller uh->check = csum_ipv6_magic(&fl6->saddr, &fl6->daddr, 1030d39d938cSVlad Yasevich len, fl6->flowi6_proto, csum); 1031db8dac20SDavid S. Miller if (uh->check == 0) 1032db8dac20SDavid S. Miller uh->check = CSUM_MANGLED_0; 1033db8dac20SDavid S. Miller 1034493c6be3SSridhar Samudrala send: 1035d39d938cSVlad Yasevich err = ip6_send_skb(skb); 10366ce9e7b5SEric Dumazet if (err) { 10376ce9e7b5SEric Dumazet if (err == -ENOBUFS && !inet6_sk(sk)->recverr) { 10386aef70a8SEric Dumazet UDP6_INC_STATS(sock_net(sk), 10396ce9e7b5SEric Dumazet UDP_MIB_SNDBUFERRORS, is_udplite); 10406ce9e7b5SEric Dumazet err = 0; 10416ce9e7b5SEric Dumazet } 10426aef70a8SEric Dumazet } else { 10436aef70a8SEric Dumazet UDP6_INC_STATS(sock_net(sk), 10446ce9e7b5SEric Dumazet UDP_MIB_OUTDATAGRAMS, is_udplite); 10456aef70a8SEric Dumazet } 1046d39d938cSVlad Yasevich return err; 1047d39d938cSVlad Yasevich } 1048d39d938cSVlad Yasevich 1049d39d938cSVlad Yasevich static int udp_v6_push_pending_frames(struct sock *sk) 1050d39d938cSVlad Yasevich { 1051d39d938cSVlad Yasevich struct sk_buff *skb; 1052d39d938cSVlad Yasevich struct udp_sock *up = udp_sk(sk); 1053d39d938cSVlad Yasevich struct flowi6 fl6; 1054d39d938cSVlad Yasevich int err = 0; 1055d39d938cSVlad Yasevich 1056d39d938cSVlad Yasevich if (up->pending == AF_INET) 1057d39d938cSVlad Yasevich return udp_push_pending_frames(sk); 1058d39d938cSVlad Yasevich 1059d39d938cSVlad Yasevich /* ip6_finish_skb will release the cork, so make a copy of 1060d39d938cSVlad Yasevich * fl6 here. 1061d39d938cSVlad Yasevich */ 1062d39d938cSVlad Yasevich fl6 = inet_sk(sk)->cork.fl.u.ip6; 1063d39d938cSVlad Yasevich 1064d39d938cSVlad Yasevich skb = ip6_finish_skb(sk); 1065d39d938cSVlad Yasevich if (!skb) 1066d39d938cSVlad Yasevich goto out; 1067d39d938cSVlad Yasevich 1068d39d938cSVlad Yasevich err = udp_v6_send_skb(skb, &fl6); 1069d39d938cSVlad Yasevich 1070db8dac20SDavid S. Miller out: 1071db8dac20SDavid S. Miller up->len = 0; 1072db8dac20SDavid S. Miller up->pending = 0; 1073db8dac20SDavid S. Miller return err; 1074db8dac20SDavid S. Miller } 1075db8dac20SDavid S. Miller 10761b784140SYing Xue int udpv6_sendmsg(struct sock *sk, struct msghdr *msg, size_t len) 1077db8dac20SDavid S. Miller { 1078db8dac20SDavid S. Miller struct ipv6_txoptions opt_space; 1079db8dac20SDavid S. Miller struct udp_sock *up = udp_sk(sk); 1080db8dac20SDavid S. Miller struct inet_sock *inet = inet_sk(sk); 1081db8dac20SDavid S. Miller struct ipv6_pinfo *np = inet6_sk(sk); 1082342dfc30SSteffen Hurrle DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, msg->msg_name); 108320c59de2SArnaud Ebalard struct in6_addr *daddr, *final_p, final; 1084db8dac20SDavid S. Miller struct ipv6_txoptions *opt = NULL; 108545f6fad8SEric Dumazet struct ipv6_txoptions *opt_to_free = NULL; 1086db8dac20SDavid S. Miller struct ip6_flowlabel *flowlabel = NULL; 10874c9483b2SDavid S. Miller struct flowi6 fl6; 1088db8dac20SDavid S. Miller struct dst_entry *dst; 108926879da5SWei Wang struct ipcm6_cookie ipc6; 1090db8dac20SDavid S. Miller int addr_len = msg->msg_namelen; 1091db8dac20SDavid S. Miller int ulen = len; 1092db8dac20SDavid S. Miller int corkreq = up->corkflag || msg->msg_flags&MSG_MORE; 1093db8dac20SDavid S. Miller int err; 1094db8dac20SDavid S. Miller int connected = 0; 1095db8dac20SDavid S. Miller int is_udplite = IS_UDPLITE(sk); 1096db8dac20SDavid S. Miller int (*getfrag)(void *, char *, int, int, int, struct sk_buff *); 1097ad1e46a8SSoheil Hassas Yeganeh struct sockcm_cookie sockc; 1098db8dac20SDavid S. Miller 109926879da5SWei Wang ipc6.hlimit = -1; 110026879da5SWei Wang ipc6.tclass = -1; 110126879da5SWei Wang ipc6.dontfrag = -1; 1102d515684dSAlexander Potapenko sockc.tsflags = sk->sk_tsflags; 110326879da5SWei Wang 1104db8dac20SDavid S. Miller /* destination address check */ 1105db8dac20SDavid S. Miller if (sin6) { 1106db8dac20SDavid S. Miller if (addr_len < offsetof(struct sockaddr, sa_data)) 1107db8dac20SDavid S. Miller return -EINVAL; 1108db8dac20SDavid S. Miller 1109db8dac20SDavid S. Miller switch (sin6->sin6_family) { 1110db8dac20SDavid S. Miller case AF_INET6: 1111db8dac20SDavid S. Miller if (addr_len < SIN6_LEN_RFC2133) 1112db8dac20SDavid S. Miller return -EINVAL; 1113db8dac20SDavid S. Miller daddr = &sin6->sin6_addr; 1114052d2369SJonathan T. Leighton if (ipv6_addr_any(daddr) && 1115052d2369SJonathan T. Leighton ipv6_addr_v4mapped(&np->saddr)) 1116052d2369SJonathan T. Leighton ipv6_addr_set_v4mapped(htonl(INADDR_LOOPBACK), 1117052d2369SJonathan T. Leighton daddr); 1118db8dac20SDavid S. Miller break; 1119db8dac20SDavid S. Miller case AF_INET: 1120db8dac20SDavid S. Miller goto do_udp_sendmsg; 1121db8dac20SDavid S. Miller case AF_UNSPEC: 1122db8dac20SDavid S. Miller msg->msg_name = sin6 = NULL; 1123db8dac20SDavid S. Miller msg->msg_namelen = addr_len = 0; 1124db8dac20SDavid S. Miller daddr = NULL; 1125db8dac20SDavid S. Miller break; 1126db8dac20SDavid S. Miller default: 1127db8dac20SDavid S. Miller return -EINVAL; 1128db8dac20SDavid S. Miller } 1129db8dac20SDavid S. Miller } else if (!up->pending) { 1130db8dac20SDavid S. Miller if (sk->sk_state != TCP_ESTABLISHED) 1131db8dac20SDavid S. Miller return -EDESTADDRREQ; 1132efe4208fSEric Dumazet daddr = &sk->sk_v6_daddr; 1133db8dac20SDavid S. Miller } else 1134db8dac20SDavid S. Miller daddr = NULL; 1135db8dac20SDavid S. Miller 1136db8dac20SDavid S. Miller if (daddr) { 1137db8dac20SDavid S. Miller if (ipv6_addr_v4mapped(daddr)) { 1138db8dac20SDavid S. Miller struct sockaddr_in sin; 1139db8dac20SDavid S. Miller sin.sin_family = AF_INET; 1140c720c7e8SEric Dumazet sin.sin_port = sin6 ? sin6->sin6_port : inet->inet_dport; 1141db8dac20SDavid S. Miller sin.sin_addr.s_addr = daddr->s6_addr32[3]; 1142db8dac20SDavid S. Miller msg->msg_name = &sin; 1143db8dac20SDavid S. Miller msg->msg_namelen = sizeof(sin); 1144db8dac20SDavid S. Miller do_udp_sendmsg: 1145db8dac20SDavid S. Miller if (__ipv6_only_sock(sk)) 1146db8dac20SDavid S. Miller return -ENETUNREACH; 11471b784140SYing Xue return udp_sendmsg(sk, msg, len); 1148db8dac20SDavid S. Miller } 1149db8dac20SDavid S. Miller } 1150db8dac20SDavid S. Miller 1151db8dac20SDavid S. Miller if (up->pending == AF_INET) 11521b784140SYing Xue return udp_sendmsg(sk, msg, len); 1153db8dac20SDavid S. Miller 1154db8dac20SDavid S. Miller /* Rough check on arithmetic overflow, 1155db8dac20SDavid S. Miller better check is made in ip6_append_data(). 1156db8dac20SDavid S. Miller */ 1157db8dac20SDavid S. Miller if (len > INT_MAX - sizeof(struct udphdr)) 1158db8dac20SDavid S. Miller return -EMSGSIZE; 1159db8dac20SDavid S. Miller 116003485f2aSVlad Yasevich getfrag = is_udplite ? udplite_getfrag : ip_generic_getfrag; 1161db8dac20SDavid S. Miller if (up->pending) { 1162db8dac20SDavid S. Miller /* 1163db8dac20SDavid S. Miller * There are pending frames. 1164db8dac20SDavid S. Miller * The socket lock must be held while it's corked. 1165db8dac20SDavid S. Miller */ 1166db8dac20SDavid S. Miller lock_sock(sk); 1167db8dac20SDavid S. Miller if (likely(up->pending)) { 1168db8dac20SDavid S. Miller if (unlikely(up->pending != AF_INET6)) { 1169db8dac20SDavid S. Miller release_sock(sk); 1170db8dac20SDavid S. Miller return -EAFNOSUPPORT; 1171db8dac20SDavid S. Miller } 1172db8dac20SDavid S. Miller dst = NULL; 1173db8dac20SDavid S. Miller goto do_append_data; 1174db8dac20SDavid S. Miller } 1175db8dac20SDavid S. Miller release_sock(sk); 1176db8dac20SDavid S. Miller } 1177db8dac20SDavid S. Miller ulen += sizeof(struct udphdr); 1178db8dac20SDavid S. Miller 11794c9483b2SDavid S. Miller memset(&fl6, 0, sizeof(fl6)); 1180db8dac20SDavid S. Miller 1181db8dac20SDavid S. Miller if (sin6) { 1182db8dac20SDavid S. Miller if (sin6->sin6_port == 0) 1183db8dac20SDavid S. Miller return -EINVAL; 1184db8dac20SDavid S. Miller 11851958b856SDavid S. Miller fl6.fl6_dport = sin6->sin6_port; 1186db8dac20SDavid S. Miller daddr = &sin6->sin6_addr; 1187db8dac20SDavid S. Miller 1188db8dac20SDavid S. Miller if (np->sndflow) { 11894c9483b2SDavid S. Miller fl6.flowlabel = sin6->sin6_flowinfo&IPV6_FLOWINFO_MASK; 11904c9483b2SDavid S. Miller if (fl6.flowlabel&IPV6_FLOWLABEL_MASK) { 11914c9483b2SDavid S. Miller flowlabel = fl6_sock_lookup(sk, fl6.flowlabel); 119263159f29SIan Morris if (!flowlabel) 1193db8dac20SDavid S. Miller return -EINVAL; 1194db8dac20SDavid S. Miller } 1195db8dac20SDavid S. Miller } 1196db8dac20SDavid S. Miller 1197db8dac20SDavid S. Miller /* 1198db8dac20SDavid S. Miller * Otherwise it will be difficult to maintain 1199db8dac20SDavid S. Miller * sk->sk_dst_cache. 1200db8dac20SDavid S. Miller */ 1201db8dac20SDavid S. Miller if (sk->sk_state == TCP_ESTABLISHED && 1202efe4208fSEric Dumazet ipv6_addr_equal(daddr, &sk->sk_v6_daddr)) 1203efe4208fSEric Dumazet daddr = &sk->sk_v6_daddr; 1204db8dac20SDavid S. Miller 1205db8dac20SDavid S. Miller if (addr_len >= sizeof(struct sockaddr_in6) && 1206db8dac20SDavid S. Miller sin6->sin6_scope_id && 1207842df073SHannes Frederic Sowa __ipv6_addr_needs_scope_id(__ipv6_addr_type(daddr))) 12084c9483b2SDavid S. Miller fl6.flowi6_oif = sin6->sin6_scope_id; 1209db8dac20SDavid S. Miller } else { 1210db8dac20SDavid S. Miller if (sk->sk_state != TCP_ESTABLISHED) 1211db8dac20SDavid S. Miller return -EDESTADDRREQ; 1212db8dac20SDavid S. Miller 12131958b856SDavid S. Miller fl6.fl6_dport = inet->inet_dport; 1214efe4208fSEric Dumazet daddr = &sk->sk_v6_daddr; 12154c9483b2SDavid S. Miller fl6.flowlabel = np->flow_label; 1216db8dac20SDavid S. Miller connected = 1; 1217db8dac20SDavid S. Miller } 1218db8dac20SDavid S. Miller 12194c9483b2SDavid S. Miller if (!fl6.flowi6_oif) 12204c9483b2SDavid S. Miller fl6.flowi6_oif = sk->sk_bound_dev_if; 1221db8dac20SDavid S. Miller 12224c9483b2SDavid S. Miller if (!fl6.flowi6_oif) 12234c9483b2SDavid S. Miller fl6.flowi6_oif = np->sticky_pktinfo.ipi6_ifindex; 12249f690db7SYang Hongyang 12254c9483b2SDavid S. Miller fl6.flowi6_mark = sk->sk_mark; 1226e2d118a1SLorenzo Colitti fl6.flowi6_uid = sk->sk_uid; 122751953d5bSBrian Haley 1228db8dac20SDavid S. Miller if (msg->msg_controllen) { 1229db8dac20SDavid S. Miller opt = &opt_space; 1230db8dac20SDavid S. Miller memset(opt, 0, sizeof(struct ipv6_txoptions)); 1231db8dac20SDavid S. Miller opt->tot_len = sizeof(*opt); 123226879da5SWei Wang ipc6.opt = opt; 1233db8dac20SDavid S. Miller 123426879da5SWei Wang err = ip6_datagram_send_ctl(sock_net(sk), sk, msg, &fl6, &ipc6, &sockc); 1235db8dac20SDavid S. Miller if (err < 0) { 1236db8dac20SDavid S. Miller fl6_sock_release(flowlabel); 1237db8dac20SDavid S. Miller return err; 1238db8dac20SDavid S. Miller } 12394c9483b2SDavid S. Miller if ((fl6.flowlabel&IPV6_FLOWLABEL_MASK) && !flowlabel) { 12404c9483b2SDavid S. Miller flowlabel = fl6_sock_lookup(sk, fl6.flowlabel); 124163159f29SIan Morris if (!flowlabel) 1242db8dac20SDavid S. Miller return -EINVAL; 1243db8dac20SDavid S. Miller } 1244db8dac20SDavid S. Miller if (!(opt->opt_nflen|opt->opt_flen)) 1245db8dac20SDavid S. Miller opt = NULL; 1246db8dac20SDavid S. Miller connected = 0; 1247db8dac20SDavid S. Miller } 124845f6fad8SEric Dumazet if (!opt) { 124945f6fad8SEric Dumazet opt = txopt_get(np); 125045f6fad8SEric Dumazet opt_to_free = opt; 125145f6fad8SEric Dumazet } 1252db8dac20SDavid S. Miller if (flowlabel) 1253db8dac20SDavid S. Miller opt = fl6_merge_options(&opt_space, flowlabel, opt); 1254db8dac20SDavid S. Miller opt = ipv6_fixup_options(&opt_space, opt); 125526879da5SWei Wang ipc6.opt = opt; 1256db8dac20SDavid S. Miller 12574c9483b2SDavid S. Miller fl6.flowi6_proto = sk->sk_protocol; 1258876c7f41SBrian Haley if (!ipv6_addr_any(daddr)) 12594e3fd7a0SAlexey Dobriyan fl6.daddr = *daddr; 1260876c7f41SBrian Haley else 12614c9483b2SDavid S. Miller fl6.daddr.s6_addr[15] = 0x1; /* :: means loopback (BSD'ism) */ 12624c9483b2SDavid S. Miller if (ipv6_addr_any(&fl6.saddr) && !ipv6_addr_any(&np->saddr)) 12634e3fd7a0SAlexey Dobriyan fl6.saddr = np->saddr; 12641958b856SDavid S. Miller fl6.fl6_sport = inet->inet_sport; 1265db8dac20SDavid S. Miller 12664c9483b2SDavid S. Miller final_p = fl6_update_dst(&fl6, opt, &final); 126720c59de2SArnaud Ebalard if (final_p) 1268db8dac20SDavid S. Miller connected = 0; 1269db8dac20SDavid S. Miller 12704c9483b2SDavid S. Miller if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr)) { 12714c9483b2SDavid S. Miller fl6.flowi6_oif = np->mcast_oif; 1272db8dac20SDavid S. Miller connected = 0; 1273c4062dfcSErich E. Hoover } else if (!fl6.flowi6_oif) 1274c4062dfcSErich E. Hoover fl6.flowi6_oif = np->ucast_oif; 1275db8dac20SDavid S. Miller 12764c9483b2SDavid S. Miller security_sk_classify_flow(sk, flowi6_to_flowi(&fl6)); 1277db8dac20SDavid S. Miller 127838b7097bSHannes Frederic Sowa if (ipc6.tclass < 0) 127938b7097bSHannes Frederic Sowa ipc6.tclass = np->tclass; 128038b7097bSHannes Frederic Sowa 128138b7097bSHannes Frederic Sowa fl6.flowlabel = ip6_make_flowinfo(ipc6.tclass, fl6.flowlabel); 128238b7097bSHannes Frederic Sowa 12830e0d44abSSteffen Klassert dst = ip6_sk_dst_lookup_flow(sk, &fl6, final_p); 128468d0c6d3SDavid S. Miller if (IS_ERR(dst)) { 128568d0c6d3SDavid S. Miller err = PTR_ERR(dst); 128668d0c6d3SDavid S. Miller dst = NULL; 1287db8dac20SDavid S. Miller goto out; 1288db8dac20SDavid S. Miller } 1289db8dac20SDavid S. Miller 129026879da5SWei Wang if (ipc6.hlimit < 0) 129126879da5SWei Wang ipc6.hlimit = ip6_sk_dst_hoplimit(np, &fl6, dst); 1292db8dac20SDavid S. Miller 1293db8dac20SDavid S. Miller if (msg->msg_flags&MSG_CONFIRM) 1294db8dac20SDavid S. Miller goto do_confirm; 1295db8dac20SDavid S. Miller back_from_confirm: 1296db8dac20SDavid S. Miller 129703485f2aSVlad Yasevich /* Lockless fast path for the non-corking case */ 129803485f2aSVlad Yasevich if (!corkreq) { 129903485f2aSVlad Yasevich struct sk_buff *skb; 130003485f2aSVlad Yasevich 130103485f2aSVlad Yasevich skb = ip6_make_skb(sk, getfrag, msg, ulen, 130226879da5SWei Wang sizeof(struct udphdr), &ipc6, 130303485f2aSVlad Yasevich &fl6, (struct rt6_info *)dst, 130426879da5SWei Wang msg->msg_flags, &sockc); 130503485f2aSVlad Yasevich err = PTR_ERR(skb); 130603485f2aSVlad Yasevich if (!IS_ERR_OR_NULL(skb)) 130703485f2aSVlad Yasevich err = udp_v6_send_skb(skb, &fl6); 130803485f2aSVlad Yasevich goto release_dst; 130903485f2aSVlad Yasevich } 131003485f2aSVlad Yasevich 1311db8dac20SDavid S. Miller lock_sock(sk); 1312db8dac20SDavid S. Miller if (unlikely(up->pending)) { 1313db8dac20SDavid S. Miller /* The socket is already corked while preparing it. */ 1314db8dac20SDavid S. Miller /* ... which is an evident application bug. --ANK */ 1315db8dac20SDavid S. Miller release_sock(sk); 1316db8dac20SDavid S. Miller 1317ba7a46f1SJoe Perches net_dbg_ratelimited("udp cork app bug 2\n"); 1318db8dac20SDavid S. Miller err = -EINVAL; 1319db8dac20SDavid S. Miller goto out; 1320db8dac20SDavid S. Miller } 1321db8dac20SDavid S. Miller 1322db8dac20SDavid S. Miller up->pending = AF_INET6; 1323db8dac20SDavid S. Miller 1324db8dac20SDavid S. Miller do_append_data: 132526879da5SWei Wang if (ipc6.dontfrag < 0) 132626879da5SWei Wang ipc6.dontfrag = np->dontfrag; 1327db8dac20SDavid S. Miller up->len += ulen; 132826879da5SWei Wang err = ip6_append_data(sk, getfrag, msg, ulen, sizeof(struct udphdr), 132926879da5SWei Wang &ipc6, &fl6, (struct rt6_info *)dst, 133026879da5SWei Wang corkreq ? msg->msg_flags|MSG_MORE : msg->msg_flags, &sockc); 1331db8dac20SDavid S. Miller if (err) 1332db8dac20SDavid S. Miller udp_v6_flush_pending_frames(sk); 1333db8dac20SDavid S. Miller else if (!corkreq) 1334db8dac20SDavid S. Miller err = udp_v6_push_pending_frames(sk); 1335db8dac20SDavid S. Miller else if (unlikely(skb_queue_empty(&sk->sk_write_queue))) 1336db8dac20SDavid S. Miller up->pending = 0; 1337db8dac20SDavid S. Miller 133803485f2aSVlad Yasevich if (err > 0) 133903485f2aSVlad Yasevich err = np->recverr ? net_xmit_errno(err) : 0; 134003485f2aSVlad Yasevich release_sock(sk); 134103485f2aSVlad Yasevich 134203485f2aSVlad Yasevich release_dst: 1343db8dac20SDavid S. Miller if (dst) { 1344db8dac20SDavid S. Miller if (connected) { 1345db8dac20SDavid S. Miller ip6_dst_store(sk, dst, 1346efe4208fSEric Dumazet ipv6_addr_equal(&fl6.daddr, &sk->sk_v6_daddr) ? 1347efe4208fSEric Dumazet &sk->sk_v6_daddr : NULL, 1348db8dac20SDavid S. Miller #ifdef CONFIG_IPV6_SUBTREES 13494c9483b2SDavid S. Miller ipv6_addr_equal(&fl6.saddr, &np->saddr) ? 1350db8dac20SDavid S. Miller &np->saddr : 1351db8dac20SDavid S. Miller #endif 1352db8dac20SDavid S. Miller NULL); 1353db8dac20SDavid S. Miller } else { 1354db8dac20SDavid S. Miller dst_release(dst); 1355db8dac20SDavid S. Miller } 1356a3c96089SYOSHIFUJI Hideaki dst = NULL; 1357db8dac20SDavid S. Miller } 1358db8dac20SDavid S. Miller 1359db8dac20SDavid S. Miller out: 1360a3c96089SYOSHIFUJI Hideaki dst_release(dst); 1361db8dac20SDavid S. Miller fl6_sock_release(flowlabel); 136245f6fad8SEric Dumazet txopt_put(opt_to_free); 1363db8dac20SDavid S. Miller if (!err) 1364db8dac20SDavid S. Miller return len; 1365db8dac20SDavid S. Miller /* 1366db8dac20SDavid S. Miller * ENOBUFS = no kernel mem, SOCK_NOSPACE = no sndbuf space. Reporting 1367db8dac20SDavid S. Miller * ENOBUFS might not be good (it's not tunable per se), but otherwise 1368db8dac20SDavid S. Miller * we don't have a good statistic (IpOutDiscards but it can be too many 1369db8dac20SDavid S. Miller * things). We could add another new stat but at least for now that 1370db8dac20SDavid S. Miller * seems like overkill. 1371db8dac20SDavid S. Miller */ 1372db8dac20SDavid S. Miller if (err == -ENOBUFS || test_bit(SOCK_NOSPACE, &sk->sk_socket->flags)) { 13736aef70a8SEric Dumazet UDP6_INC_STATS(sock_net(sk), 1374235b9f7aSPavel Emelyanov UDP_MIB_SNDBUFERRORS, is_udplite); 1375db8dac20SDavid S. Miller } 1376db8dac20SDavid S. Miller return err; 1377db8dac20SDavid S. Miller 1378db8dac20SDavid S. Miller do_confirm: 13790dec879fSJulian Anastasov if (msg->msg_flags & MSG_PROBE) 13800dec879fSJulian Anastasov dst_confirm_neigh(dst, &fl6.daddr); 1381db8dac20SDavid S. Miller if (!(msg->msg_flags&MSG_PROBE) || len) 1382db8dac20SDavid S. Miller goto back_from_confirm; 1383db8dac20SDavid S. Miller err = 0; 1384db8dac20SDavid S. Miller goto out; 1385db8dac20SDavid S. Miller } 1386db8dac20SDavid S. Miller 13877d06b2e0SBrian Haley void udpv6_destroy_sock(struct sock *sk) 1388db8dac20SDavid S. Miller { 138944046a59STom Parkin struct udp_sock *up = udp_sk(sk); 1390db8dac20SDavid S. Miller lock_sock(sk); 1391db8dac20SDavid S. Miller udp_v6_flush_pending_frames(sk); 1392db8dac20SDavid S. Miller release_sock(sk); 1393db8dac20SDavid S. Miller 139444046a59STom Parkin if (static_key_false(&udpv6_encap_needed) && up->encap_type) { 139544046a59STom Parkin void (*encap_destroy)(struct sock *sk); 139644046a59STom Parkin encap_destroy = ACCESS_ONCE(up->encap_destroy); 139744046a59STom Parkin if (encap_destroy) 139844046a59STom Parkin encap_destroy(sk); 139944046a59STom Parkin } 140044046a59STom Parkin 1401db8dac20SDavid S. Miller inet6_destroy_sock(sk); 1402db8dac20SDavid S. Miller } 1403db8dac20SDavid S. Miller 1404db8dac20SDavid S. Miller /* 1405db8dac20SDavid S. Miller * Socket option code for UDP 1406db8dac20SDavid S. Miller */ 1407db8dac20SDavid S. Miller int udpv6_setsockopt(struct sock *sk, int level, int optname, 1408b7058842SDavid S. Miller char __user *optval, unsigned int optlen) 1409db8dac20SDavid S. Miller { 1410db8dac20SDavid S. Miller if (level == SOL_UDP || level == SOL_UDPLITE) 1411db8dac20SDavid S. Miller return udp_lib_setsockopt(sk, level, optname, optval, optlen, 1412db8dac20SDavid S. Miller udp_v6_push_pending_frames); 1413db8dac20SDavid S. Miller return ipv6_setsockopt(sk, level, optname, optval, optlen); 1414db8dac20SDavid S. Miller } 1415db8dac20SDavid S. Miller 1416db8dac20SDavid S. Miller #ifdef CONFIG_COMPAT 1417db8dac20SDavid S. Miller int compat_udpv6_setsockopt(struct sock *sk, int level, int optname, 1418b7058842SDavid S. Miller char __user *optval, unsigned int optlen) 1419db8dac20SDavid S. Miller { 1420db8dac20SDavid S. Miller if (level == SOL_UDP || level == SOL_UDPLITE) 1421db8dac20SDavid S. Miller return udp_lib_setsockopt(sk, level, optname, optval, optlen, 1422db8dac20SDavid S. Miller udp_v6_push_pending_frames); 1423db8dac20SDavid S. Miller return compat_ipv6_setsockopt(sk, level, optname, optval, optlen); 1424db8dac20SDavid S. Miller } 1425db8dac20SDavid S. Miller #endif 1426db8dac20SDavid S. Miller 1427db8dac20SDavid S. Miller int udpv6_getsockopt(struct sock *sk, int level, int optname, 1428db8dac20SDavid S. Miller char __user *optval, int __user *optlen) 1429db8dac20SDavid S. Miller { 1430db8dac20SDavid S. Miller if (level == SOL_UDP || level == SOL_UDPLITE) 1431db8dac20SDavid S. Miller return udp_lib_getsockopt(sk, level, optname, optval, optlen); 1432db8dac20SDavid S. Miller return ipv6_getsockopt(sk, level, optname, optval, optlen); 1433db8dac20SDavid S. Miller } 1434db8dac20SDavid S. Miller 1435db8dac20SDavid S. Miller #ifdef CONFIG_COMPAT 1436db8dac20SDavid S. Miller int compat_udpv6_getsockopt(struct sock *sk, int level, int optname, 1437db8dac20SDavid S. Miller char __user *optval, int __user *optlen) 1438db8dac20SDavid S. Miller { 1439db8dac20SDavid S. Miller if (level == SOL_UDP || level == SOL_UDPLITE) 1440db8dac20SDavid S. Miller return udp_lib_getsockopt(sk, level, optname, optval, optlen); 1441db8dac20SDavid S. Miller return compat_ipv6_getsockopt(sk, level, optname, optval, optlen); 1442db8dac20SDavid S. Miller } 1443db8dac20SDavid S. Miller #endif 1444db8dac20SDavid S. Miller 1445dddb64bcSsubashab@codeaurora.org static struct inet6_protocol udpv6_protocol = { 14465425077dSsubashab@codeaurora.org .early_demux = udp_v6_early_demux, 1447dddb64bcSsubashab@codeaurora.org .early_demux_handler = udp_v6_early_demux, 1448db8dac20SDavid S. Miller .handler = udpv6_rcv, 1449db8dac20SDavid S. Miller .err_handler = udpv6_err, 1450db8dac20SDavid S. Miller .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL, 1451db8dac20SDavid S. Miller }; 1452db8dac20SDavid S. Miller 1453db8dac20SDavid S. Miller /* ------------------------------------------------------------------------ */ 1454db8dac20SDavid S. Miller #ifdef CONFIG_PROC_FS 1455db8dac20SDavid S. Miller int udp6_seq_show(struct seq_file *seq, void *v) 1456db8dac20SDavid S. Miller { 145717ef66afSLorenzo Colitti if (v == SEQ_START_TOKEN) { 145817ef66afSLorenzo Colitti seq_puts(seq, IPV6_SEQ_DGRAM_HEADER); 145917ef66afSLorenzo Colitti } else { 146017ef66afSLorenzo Colitti int bucket = ((struct udp_iter_state *)seq->private)->bucket; 146117ef66afSLorenzo Colitti struct inet_sock *inet = inet_sk(v); 146217ef66afSLorenzo Colitti __u16 srcp = ntohs(inet->inet_sport); 146317ef66afSLorenzo Colitti __u16 destp = ntohs(inet->inet_dport); 146417ef66afSLorenzo Colitti ip6_dgram_sock_seq_show(seq, v, srcp, destp, bucket); 146517ef66afSLorenzo Colitti } 1466db8dac20SDavid S. Miller return 0; 1467db8dac20SDavid S. Miller } 1468db8dac20SDavid S. Miller 146973cb88ecSArjan van de Ven static const struct file_operations udp6_afinfo_seq_fops = { 147073cb88ecSArjan van de Ven .owner = THIS_MODULE, 147173cb88ecSArjan van de Ven .open = udp_seq_open, 147273cb88ecSArjan van de Ven .read = seq_read, 147373cb88ecSArjan van de Ven .llseek = seq_lseek, 147473cb88ecSArjan van de Ven .release = seq_release_net 147573cb88ecSArjan van de Ven }; 147673cb88ecSArjan van de Ven 1477db8dac20SDavid S. Miller static struct udp_seq_afinfo udp6_seq_afinfo = { 1478db8dac20SDavid S. Miller .name = "udp6", 1479db8dac20SDavid S. Miller .family = AF_INET6, 1480645ca708SEric Dumazet .udp_table = &udp_table, 148173cb88ecSArjan van de Ven .seq_fops = &udp6_afinfo_seq_fops, 1482dda61925SDenis V. Lunev .seq_ops = { 1483dda61925SDenis V. Lunev .show = udp6_seq_show, 1484dda61925SDenis V. Lunev }, 1485db8dac20SDavid S. Miller }; 1486db8dac20SDavid S. Miller 14872c8c1e72SAlexey Dobriyan int __net_init udp6_proc_init(struct net *net) 1488db8dac20SDavid S. Miller { 14890c96d8c5SDaniel Lezcano return udp_proc_register(net, &udp6_seq_afinfo); 1490db8dac20SDavid S. Miller } 1491db8dac20SDavid S. Miller 1492ec120da6SIan Morris void udp6_proc_exit(struct net *net) 1493ec120da6SIan Morris { 14940c96d8c5SDaniel Lezcano udp_proc_unregister(net, &udp6_seq_afinfo); 1495db8dac20SDavid S. Miller } 1496db8dac20SDavid S. Miller #endif /* CONFIG_PROC_FS */ 1497db8dac20SDavid S. Miller 1498db8dac20SDavid S. Miller /* ------------------------------------------------------------------------ */ 1499db8dac20SDavid S. Miller 1500db8dac20SDavid S. Miller struct proto udpv6_prot = { 1501db8dac20SDavid S. Miller .name = "UDPv6", 1502db8dac20SDavid S. Miller .owner = THIS_MODULE, 1503db8dac20SDavid S. Miller .close = udp_lib_close, 1504db8dac20SDavid S. Miller .connect = ip6_datagram_connect, 1505db8dac20SDavid S. Miller .disconnect = udp_disconnect, 1506db8dac20SDavid S. Miller .ioctl = udp_ioctl, 1507850cbaddSPaolo Abeni .init = udp_init_sock, 1508db8dac20SDavid S. Miller .destroy = udpv6_destroy_sock, 1509db8dac20SDavid S. Miller .setsockopt = udpv6_setsockopt, 1510db8dac20SDavid S. Miller .getsockopt = udpv6_getsockopt, 1511db8dac20SDavid S. Miller .sendmsg = udpv6_sendmsg, 1512db8dac20SDavid S. Miller .recvmsg = udpv6_recvmsg, 1513e646b657SMartin KaFai Lau .release_cb = ip6_datagram_release_cb, 1514db8dac20SDavid S. Miller .hash = udp_lib_hash, 1515db8dac20SDavid S. Miller .unhash = udp_lib_unhash, 1516719f8358SEric Dumazet .rehash = udp_v6_rehash, 1517db8dac20SDavid S. Miller .get_port = udp_v6_get_port, 1518db8dac20SDavid S. Miller .memory_allocated = &udp_memory_allocated, 1519db8dac20SDavid S. Miller .sysctl_mem = sysctl_udp_mem, 1520db8dac20SDavid S. Miller .sysctl_wmem = &sysctl_udp_wmem_min, 1521db8dac20SDavid S. Miller .sysctl_rmem = &sysctl_udp_rmem_min, 1522db8dac20SDavid S. Miller .obj_size = sizeof(struct udp6_sock), 1523645ca708SEric Dumazet .h.udp_table = &udp_table, 1524db8dac20SDavid S. Miller #ifdef CONFIG_COMPAT 1525db8dac20SDavid S. Miller .compat_setsockopt = compat_udpv6_setsockopt, 1526db8dac20SDavid S. Miller .compat_getsockopt = compat_udpv6_getsockopt, 1527db8dac20SDavid S. Miller #endif 15285d77dca8SDavid Ahern .diag_destroy = udp_abort, 1529db8dac20SDavid S. Miller }; 1530db8dac20SDavid S. Miller 1531db8dac20SDavid S. Miller static struct inet_protosw udpv6_protosw = { 1532db8dac20SDavid S. Miller .type = SOCK_DGRAM, 1533db8dac20SDavid S. Miller .protocol = IPPROTO_UDP, 1534db8dac20SDavid S. Miller .prot = &udpv6_prot, 1535db8dac20SDavid S. Miller .ops = &inet6_dgram_ops, 1536db8dac20SDavid S. Miller .flags = INET_PROTOSW_PERMANENT, 1537db8dac20SDavid S. Miller }; 1538db8dac20SDavid S. Miller 1539db8dac20SDavid S. Miller int __init udpv6_init(void) 1540db8dac20SDavid S. Miller { 1541db8dac20SDavid S. Miller int ret; 1542db8dac20SDavid S. Miller 15433336288aSVlad Yasevich ret = inet6_add_protocol(&udpv6_protocol, IPPROTO_UDP); 15443336288aSVlad Yasevich if (ret) 1545c6b641a4SVlad Yasevich goto out; 15463336288aSVlad Yasevich 1547db8dac20SDavid S. Miller ret = inet6_register_protosw(&udpv6_protosw); 1548db8dac20SDavid S. Miller if (ret) 1549db8dac20SDavid S. Miller goto out_udpv6_protocol; 1550db8dac20SDavid S. Miller out: 1551db8dac20SDavid S. Miller return ret; 1552db8dac20SDavid S. Miller 1553db8dac20SDavid S. Miller out_udpv6_protocol: 1554db8dac20SDavid S. Miller inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP); 1555db8dac20SDavid S. Miller goto out; 1556db8dac20SDavid S. Miller } 1557db8dac20SDavid S. Miller 1558db8dac20SDavid S. Miller void udpv6_exit(void) 1559db8dac20SDavid S. Miller { 1560db8dac20SDavid S. Miller inet6_unregister_protosw(&udpv6_protosw); 1561db8dac20SDavid S. Miller inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP); 1562db8dac20SDavid S. Miller } 1563