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> 48e7cc0824SStefano Brivio #include <net/ip6_tunnel.h> 49db8dac20SDavid S. Miller #include <net/xfrm.h> 500bd84065Ssubashab@codeaurora.org #include <net/inet_hashtables.h> 5172289b96STom Herbert #include <net/inet6_hashtables.h> 52076bb0c8SEliezer Tamir #include <net/busy_poll.h> 53e32ea7e7SCraig Gallek #include <net/sock_reuseport.h> 54db8dac20SDavid S. Miller 55db8dac20SDavid S. Miller #include <linux/proc_fs.h> 56db8dac20SDavid S. Miller #include <linux/seq_file.h> 5722911fc5SEric Dumazet #include <trace/events/skb.h> 58db8dac20SDavid S. Miller #include "udp_impl.h" 59db8dac20SDavid S. Miller 6063a6fff3SRobert Shearman static bool udp6_lib_exact_dif_match(struct net *net, struct sk_buff *skb) 6163a6fff3SRobert Shearman { 6263a6fff3SRobert Shearman #if defined(CONFIG_NET_L3_MASTER_DEV) 6363a6fff3SRobert Shearman if (!net->ipv4.sysctl_udp_l3mdev_accept && 6463a6fff3SRobert Shearman skb && ipv6_l3mdev_skb(IP6CB(skb)->flags)) 6563a6fff3SRobert Shearman return true; 6663a6fff3SRobert Shearman #endif 6763a6fff3SRobert Shearman return false; 6863a6fff3SRobert Shearman } 6963a6fff3SRobert Shearman 706eada011SEric Dumazet static u32 udp6_ehashfn(const struct net *net, 71b50026b5SHannes Frederic Sowa const struct in6_addr *laddr, 72b50026b5SHannes Frederic Sowa const u16 lport, 73b50026b5SHannes Frederic Sowa const struct in6_addr *faddr, 74b50026b5SHannes Frederic Sowa const __be16 fport) 75b50026b5SHannes Frederic Sowa { 761bbdceefSHannes Frederic Sowa static u32 udp6_ehash_secret __read_mostly; 771bbdceefSHannes Frederic Sowa static u32 udp_ipv6_hash_secret __read_mostly; 781bbdceefSHannes Frederic Sowa 791bbdceefSHannes Frederic Sowa u32 lhash, fhash; 801bbdceefSHannes Frederic Sowa 811bbdceefSHannes Frederic Sowa net_get_random_once(&udp6_ehash_secret, 821bbdceefSHannes Frederic Sowa sizeof(udp6_ehash_secret)); 831bbdceefSHannes Frederic Sowa net_get_random_once(&udp_ipv6_hash_secret, 841bbdceefSHannes Frederic Sowa sizeof(udp_ipv6_hash_secret)); 851bbdceefSHannes Frederic Sowa 861bbdceefSHannes Frederic Sowa lhash = (__force u32)laddr->s6_addr32[3]; 871bbdceefSHannes Frederic Sowa fhash = __ipv6_addr_jhash(faddr, udp_ipv6_hash_secret); 881bbdceefSHannes Frederic Sowa 89b50026b5SHannes Frederic Sowa return __inet6_ehashfn(lhash, lport, fhash, fport, 901bbdceefSHannes Frederic Sowa udp_ipv6_hash_secret + net_hash_mix(net)); 91b50026b5SHannes Frederic Sowa } 92b50026b5SHannes Frederic Sowa 936ba5a3c5SPavel Emelyanov int udp_v6_get_port(struct sock *sk, unsigned short snum) 94db8dac20SDavid S. Miller { 9530fff923SEric Dumazet unsigned int hash2_nulladdr = 96f0b1e64cSMartin KaFai Lau ipv6_portaddr_hash(sock_net(sk), &in6addr_any, snum); 9730fff923SEric Dumazet unsigned int hash2_partial = 98f0b1e64cSMartin KaFai Lau ipv6_portaddr_hash(sock_net(sk), &sk->sk_v6_rcv_saddr, 0); 9930fff923SEric Dumazet 100d4cada4aSEric Dumazet /* precompute partial secondary hash */ 10130fff923SEric Dumazet udp_sk(sk)->udp_portaddr_hash = hash2_partial; 102fe38d2a1SJosef Bacik return udp_lib_get_port(sk, snum, hash2_nulladdr); 103db8dac20SDavid S. Miller } 104db8dac20SDavid S. Miller 105719f8358SEric Dumazet static void udp_v6_rehash(struct sock *sk) 106719f8358SEric Dumazet { 107f0b1e64cSMartin KaFai Lau u16 new_hash = ipv6_portaddr_hash(sock_net(sk), 108efe4208fSEric Dumazet &sk->sk_v6_rcv_saddr, 109719f8358SEric Dumazet inet_sk(sk)->inet_num); 110719f8358SEric Dumazet 111719f8358SEric Dumazet udp_lib_rehash(sk, new_hash); 112719f8358SEric Dumazet } 113719f8358SEric Dumazet 114d1e37288SSu, Xuemin static int compute_score(struct sock *sk, struct net *net, 11588440ae7SBalazs Scheidler const struct in6_addr *saddr, __be16 sport, 116d1e37288SSu, Xuemin const struct in6_addr *daddr, unsigned short hnum, 1171801b570SDavid Ahern int dif, int sdif, bool exact_dif) 118db8dac20SDavid S. Miller { 11960c04aecSJoe Perches int score; 12060c04aecSJoe Perches struct inet_sock *inet; 1216da5b0f0SMike Manning bool dev_match; 122db8dac20SDavid S. Miller 12360c04aecSJoe Perches if (!net_eq(sock_net(sk), net) || 12460c04aecSJoe Perches udp_sk(sk)->udp_port_hash != hnum || 12560c04aecSJoe Perches sk->sk_family != PF_INET6) 12660c04aecSJoe Perches return -1; 127645ca708SEric Dumazet 12823b0269eSPeter Oskolkov if (!ipv6_addr_equal(&sk->sk_v6_rcv_saddr, daddr)) 12923b0269eSPeter Oskolkov return -1; 13023b0269eSPeter Oskolkov 131645ca708SEric Dumazet score = 0; 13260c04aecSJoe Perches inet = inet_sk(sk); 13360c04aecSJoe Perches 134c720c7e8SEric Dumazet if (inet->inet_dport) { 135c720c7e8SEric Dumazet if (inet->inet_dport != sport) 136645ca708SEric Dumazet return -1; 137db8dac20SDavid S. Miller score++; 138db8dac20SDavid S. Miller } 13960c04aecSJoe Perches 140efe4208fSEric Dumazet if (!ipv6_addr_any(&sk->sk_v6_daddr)) { 141efe4208fSEric Dumazet if (!ipv6_addr_equal(&sk->sk_v6_daddr, saddr)) 142645ca708SEric Dumazet return -1; 143db8dac20SDavid S. Miller score++; 144db8dac20SDavid S. Miller } 14560c04aecSJoe Perches 1466da5b0f0SMike Manning dev_match = udp_sk_bound_dev_eq(net, sk->sk_bound_dev_if, dif, sdif); 14769678bcdSPaolo Abeni if (!dev_match) 148645ca708SEric Dumazet return -1; 149db8dac20SDavid S. Miller score++; 15060c04aecSJoe Perches 15170da268bSEric Dumazet if (sk->sk_incoming_cpu == raw_smp_processor_id()) 15270da268bSEric Dumazet score++; 15370da268bSEric Dumazet 154645ca708SEric Dumazet return score; 155645ca708SEric Dumazet } 156645ca708SEric Dumazet 157d1e37288SSu, Xuemin /* called with rcu_read_lock() */ 158fddc17deSEric Dumazet static struct sock *udp6_lib_lookup2(struct net *net, 159fddc17deSEric Dumazet const struct in6_addr *saddr, __be16 sport, 1601801b570SDavid Ahern const struct in6_addr *daddr, unsigned int hnum, 1611801b570SDavid Ahern int dif, int sdif, bool exact_dif, 1621801b570SDavid Ahern struct udp_hslot *hslot2, struct sk_buff *skb) 163fddc17deSEric Dumazet { 164fddc17deSEric Dumazet struct sock *sk, *result; 165e94a62f5SPaolo Abeni int score, badness; 16672289b96STom Herbert u32 hash = 0; 167fddc17deSEric Dumazet 168fddc17deSEric Dumazet result = NULL; 169fddc17deSEric Dumazet badness = -1; 170ca065d0cSEric Dumazet udp_portaddr_for_each_entry_rcu(sk, &hslot2->head) { 171d1e37288SSu, Xuemin score = compute_score(sk, net, saddr, sport, 1721801b570SDavid Ahern daddr, hnum, dif, sdif, exact_dif); 173fddc17deSEric Dumazet if (score > badness) { 174e94a62f5SPaolo Abeni if (sk->sk_reuseport) { 175b50026b5SHannes Frederic Sowa hash = udp6_ehashfn(net, daddr, hnum, 17672289b96STom Herbert saddr, sport); 177ed0dfffdSEric Dumazet 178ca065d0cSEric Dumazet result = reuseport_select_sock(sk, hash, skb, 1791134158bSCraig Gallek sizeof(struct udphdr)); 180ca065d0cSEric Dumazet if (result) 181ca065d0cSEric Dumazet return result; 18270da268bSEric Dumazet } 183ca065d0cSEric Dumazet result = sk; 184ca065d0cSEric Dumazet badness = score; 185fddc17deSEric Dumazet } 186fddc17deSEric Dumazet } 187fddc17deSEric Dumazet return result; 188fddc17deSEric Dumazet } 189fddc17deSEric Dumazet 190ca065d0cSEric Dumazet /* rcu_read_lock() must be held */ 191fce82338SPavel Emelyanov struct sock *__udp6_lib_lookup(struct net *net, 19288440ae7SBalazs Scheidler const struct in6_addr *saddr, __be16 sport, 19388440ae7SBalazs Scheidler const struct in6_addr *daddr, __be16 dport, 1941801b570SDavid Ahern int dif, int sdif, struct udp_table *udptable, 195538950a1SCraig Gallek struct sk_buff *skb) 196645ca708SEric Dumazet { 197645ca708SEric Dumazet unsigned short hnum = ntohs(dport); 19823b0269eSPeter Oskolkov unsigned int hash2, slot2; 19923b0269eSPeter Oskolkov struct udp_hslot *hslot2; 20023b0269eSPeter Oskolkov struct sock *result; 20163a6fff3SRobert Shearman bool exact_dif = udp6_lib_exact_dif_match(net, skb); 202645ca708SEric Dumazet 203f0b1e64cSMartin KaFai Lau hash2 = ipv6_portaddr_hash(net, daddr, hnum); 204fddc17deSEric Dumazet slot2 = hash2 & udptable->mask; 205fddc17deSEric Dumazet hslot2 = &udptable->hash2[slot2]; 206fddc17deSEric Dumazet 207fddc17deSEric Dumazet result = udp6_lib_lookup2(net, saddr, sport, 2081801b570SDavid Ahern daddr, hnum, dif, sdif, exact_dif, 209d1e37288SSu, Xuemin hslot2, skb); 210fddc17deSEric Dumazet if (!result) { 211f0b1e64cSMartin KaFai Lau hash2 = ipv6_portaddr_hash(net, &in6addr_any, hnum); 212fddc17deSEric Dumazet slot2 = hash2 & udptable->mask; 213d1e37288SSu, Xuemin 214fddc17deSEric Dumazet hslot2 = &udptable->hash2[slot2]; 215fddc17deSEric Dumazet 2161223c67cSJorge Boncompte [DTI2] result = udp6_lib_lookup2(net, saddr, sport, 21723b0269eSPeter Oskolkov &in6addr_any, hnum, dif, sdif, 21863a6fff3SRobert Shearman exact_dif, hslot2, 21963a6fff3SRobert Shearman skb); 220fddc17deSEric Dumazet } 2218217ca65SMartin KaFai Lau if (unlikely(IS_ERR(result))) 2228217ca65SMartin KaFai Lau return NULL; 223fddc17deSEric Dumazet return result; 224fddc17deSEric Dumazet } 225fce82338SPavel Emelyanov EXPORT_SYMBOL_GPL(__udp6_lib_lookup); 226db8dac20SDavid S. Miller 227607c4aafSKOVACS Krisztian static struct sock *__udp6_lib_lookup_skb(struct sk_buff *skb, 228607c4aafSKOVACS Krisztian __be16 sport, __be16 dport, 229645ca708SEric Dumazet struct udp_table *udptable) 230607c4aafSKOVACS Krisztian { 231b71d1d42SEric Dumazet const struct ipv6hdr *iph = ipv6_hdr(skb); 232607c4aafSKOVACS Krisztian 233ed7cbbceSAlexander Duyck return __udp6_lib_lookup(dev_net(skb->dev), &iph->saddr, sport, 234607c4aafSKOVACS Krisztian &iph->daddr, dport, inet6_iif(skb), 2351801b570SDavid Ahern inet6_sdif(skb), udptable, skb); 236607c4aafSKOVACS Krisztian } 237607c4aafSKOVACS Krisztian 23863058308STom Herbert struct sock *udp6_lib_lookup_skb(struct sk_buff *skb, 23963058308STom Herbert __be16 sport, __be16 dport) 24063058308STom Herbert { 24163058308STom Herbert const struct ipv6hdr *iph = ipv6_hdr(skb); 24263058308STom Herbert 243ed7cbbceSAlexander Duyck return __udp6_lib_lookup(dev_net(skb->dev), &iph->saddr, sport, 24463058308STom Herbert &iph->daddr, dport, inet6_iif(skb), 2451801b570SDavid Ahern inet6_sdif(skb), &udp_table, skb); 24663058308STom Herbert } 24763058308STom Herbert EXPORT_SYMBOL_GPL(udp6_lib_lookup_skb); 24863058308STom Herbert 249ca065d0cSEric Dumazet /* Must be called under rcu_read_lock(). 250ca065d0cSEric Dumazet * Does increment socket refcount. 251ca065d0cSEric Dumazet */ 2526e86000cSArnd Bergmann #if IS_ENABLED(CONFIG_NF_TPROXY_IPV6) || IS_ENABLED(CONFIG_NF_SOCKET_IPV6) 253aa976fc0SBalazs Scheidler struct sock *udp6_lib_lookup(struct net *net, const struct in6_addr *saddr, __be16 sport, 254aa976fc0SBalazs Scheidler const struct in6_addr *daddr, __be16 dport, int dif) 255aa976fc0SBalazs Scheidler { 256ca065d0cSEric Dumazet struct sock *sk; 257ca065d0cSEric Dumazet 258ca065d0cSEric Dumazet sk = __udp6_lib_lookup(net, saddr, sport, daddr, dport, 2591801b570SDavid Ahern dif, 0, &udp_table, NULL); 26041c6d650SReshetova, Elena if (sk && !refcount_inc_not_zero(&sk->sk_refcnt)) 261ca065d0cSEric Dumazet sk = NULL; 262ca065d0cSEric Dumazet return sk; 263aa976fc0SBalazs Scheidler } 264aa976fc0SBalazs Scheidler EXPORT_SYMBOL_GPL(udp6_lib_lookup); 265ca065d0cSEric Dumazet #endif 266aa976fc0SBalazs Scheidler 267cb891fa6SPaolo Abeni /* do not use the scratch area len for jumbogram: their length execeeds the 268cb891fa6SPaolo Abeni * scratch area space; note that the IP6CB flags is still in the first 269cb891fa6SPaolo Abeni * cacheline, so checking for jumbograms is cheap 270cb891fa6SPaolo Abeni */ 271cb891fa6SPaolo Abeni static int udp6_skb_len(struct sk_buff *skb) 272cb891fa6SPaolo Abeni { 273cb891fa6SPaolo Abeni return unlikely(inet6_is_jumbogram(skb)) ? skb->len : udp_skb_len(skb); 274cb891fa6SPaolo Abeni } 275cb891fa6SPaolo Abeni 276db8dac20SDavid S. Miller /* 277db8dac20SDavid S. Miller * This should be easy, if there is something there we 278db8dac20SDavid S. Miller * return it, otherwise we block. 279db8dac20SDavid S. Miller */ 280db8dac20SDavid S. Miller 2811b784140SYing Xue int udpv6_recvmsg(struct sock *sk, struct msghdr *msg, size_t len, 282db8dac20SDavid S. Miller int noblock, int flags, int *addr_len) 283db8dac20SDavid S. Miller { 284db8dac20SDavid S. Miller struct ipv6_pinfo *np = inet6_sk(sk); 285db8dac20SDavid S. Miller struct inet_sock *inet = inet_sk(sk); 286db8dac20SDavid S. Miller struct sk_buff *skb; 28759c2cdaeSDavid S. Miller unsigned int ulen, copied; 288627d2d6bSsamanthakumar int peeked, peeking, off; 289db8dac20SDavid S. Miller int err; 290db8dac20SDavid S. Miller int is_udplite = IS_UDPLITE(sk); 291197c949eSEric Dumazet bool checksum_valid = false; 292029a3743SPaolo Abeni struct udp_mib *mib; 293f26ba175SWei Yongjun int is_udp4; 294db8dac20SDavid S. Miller 295db8dac20SDavid S. Miller if (flags & MSG_ERRQUEUE) 29685fbaa75SHannes Frederic Sowa return ipv6_recv_error(sk, msg, len, addr_len); 297db8dac20SDavid S. Miller 2984b340ae2SBrian Haley if (np->rxpmtu && np->rxopt.bits.rxpmtu) 29985fbaa75SHannes Frederic Sowa return ipv6_recv_rxpmtu(sk, msg, len, addr_len); 3004b340ae2SBrian Haley 301db8dac20SDavid S. Miller try_again: 302a0917e0bSMatthew Dawson peeking = flags & MSG_PEEK; 303a0917e0bSMatthew Dawson off = sk_peek_offset(sk, flags); 3047c13f97fSPaolo Abeni skb = __skb_recv_udp(sk, flags, noblock, &peeked, &off, &err); 305db8dac20SDavid S. Miller if (!skb) 306627d2d6bSsamanthakumar return err; 307db8dac20SDavid S. Miller 308cb891fa6SPaolo Abeni ulen = udp6_skb_len(skb); 30959c2cdaeSDavid S. Miller copied = len; 310627d2d6bSsamanthakumar if (copied > ulen - off) 311627d2d6bSsamanthakumar copied = ulen - off; 31259c2cdaeSDavid S. Miller else if (copied < ulen) 313db8dac20SDavid S. Miller msg->msg_flags |= MSG_TRUNC; 314db8dac20SDavid S. Miller 315f26ba175SWei Yongjun is_udp4 = (skb->protocol == htons(ETH_P_IP)); 316029a3743SPaolo Abeni mib = __UDPX_MIB(sk, is_udp4); 317f26ba175SWei Yongjun 318db8dac20SDavid S. Miller /* 319db8dac20SDavid S. Miller * If checksum is needed at all, try to do it while copying the 320db8dac20SDavid S. Miller * data. If the data is truncated, or if we only want a partial 321db8dac20SDavid S. Miller * coverage checksum (UDP-Lite), do it before the copy. 322db8dac20SDavid S. Miller */ 323db8dac20SDavid S. Miller 324d21dbdfeSEric Dumazet if (copied < ulen || peeking || 325d21dbdfeSEric Dumazet (is_udplite && UDP_SKB_CB(skb)->partial_cov)) { 32667a51780SPaolo Abeni checksum_valid = udp_skb_csum_unnecessary(skb) || 32767a51780SPaolo Abeni !__udp_lib_checksum_complete(skb); 328197c949eSEric Dumazet if (!checksum_valid) 329db8dac20SDavid S. Miller goto csum_copy_err; 330db8dac20SDavid S. Miller } 331db8dac20SDavid S. Miller 33267a51780SPaolo Abeni if (checksum_valid || udp_skb_csum_unnecessary(skb)) { 33367a51780SPaolo Abeni if (udp_skb_is_linear(skb)) 33467a51780SPaolo Abeni err = copy_linear_skb(skb, copied, off, &msg->msg_iter); 33567a51780SPaolo Abeni else 336627d2d6bSsamanthakumar err = skb_copy_datagram_msg(skb, off, msg, copied); 33767a51780SPaolo Abeni } else { 338627d2d6bSsamanthakumar err = skb_copy_and_csum_datagram_msg(skb, off, msg); 339db8dac20SDavid S. Miller if (err == -EINVAL) 340db8dac20SDavid S. Miller goto csum_copy_err; 341db8dac20SDavid S. Miller } 34222911fc5SEric Dumazet if (unlikely(err)) { 343979402b1SEric Dumazet if (!peeked) { 344979402b1SEric Dumazet atomic_inc(&sk->sk_drops); 345029a3743SPaolo Abeni SNMP_INC_STATS(mib, UDP_MIB_INERRORS); 346979402b1SEric Dumazet } 347850cbaddSPaolo Abeni kfree_skb(skb); 348627d2d6bSsamanthakumar return err; 34922911fc5SEric Dumazet } 350029a3743SPaolo Abeni if (!peeked) 351029a3743SPaolo Abeni SNMP_INC_STATS(mib, UDP_MIB_INDATAGRAMS); 352db8dac20SDavid S. Miller 3533b885787SNeil Horman sock_recv_ts_and_drops(msg, sk, skb); 354db8dac20SDavid S. Miller 355db8dac20SDavid S. Miller /* Copy the address. */ 356db8dac20SDavid S. Miller if (msg->msg_name) { 357342dfc30SSteffen Hurrle DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, msg->msg_name); 358db8dac20SDavid S. Miller sin6->sin6_family = AF_INET6; 359db8dac20SDavid S. Miller sin6->sin6_port = udp_hdr(skb)->source; 360db8dac20SDavid S. Miller sin6->sin6_flowinfo = 0; 361db8dac20SDavid S. Miller 362842df073SHannes Frederic Sowa if (is_udp4) { 363b301e82cSBrian Haley ipv6_addr_set_v4mapped(ip_hdr(skb)->saddr, 364b301e82cSBrian Haley &sin6->sin6_addr); 365842df073SHannes Frederic Sowa sin6->sin6_scope_id = 0; 366842df073SHannes Frederic Sowa } else { 3674e3fd7a0SAlexey Dobriyan sin6->sin6_addr = ipv6_hdr(skb)->saddr; 368842df073SHannes Frederic Sowa sin6->sin6_scope_id = 369842df073SHannes Frederic Sowa ipv6_iface_scope_id(&sin6->sin6_addr, 3704330487aSDuan Jiong inet6_iif(skb)); 371db8dac20SDavid S. Miller } 372bceaa902SHannes Frederic Sowa *addr_len = sizeof(*sin6); 373db8dac20SDavid S. Miller } 3744b261c75SHannes Frederic Sowa 375bcd1665eSPaolo Abeni if (udp_sk(sk)->gro_enabled) 376bcd1665eSPaolo Abeni udp_cmsg_recv(msg, sk, skb); 377bcd1665eSPaolo Abeni 3784b261c75SHannes Frederic Sowa if (np->rxopt.all) 3794b261c75SHannes Frederic Sowa ip6_datagram_recv_common_ctl(sk, msg, skb); 3804b261c75SHannes Frederic Sowa 381f26ba175SWei Yongjun if (is_udp4) { 382db8dac20SDavid S. Miller if (inet->cmsg_flags) 383ad959036SPaolo Abeni ip_cmsg_recv_offset(msg, sk, skb, 38410df8e61SEric Dumazet sizeof(struct udphdr), off); 385db8dac20SDavid S. Miller } else { 386db8dac20SDavid S. Miller if (np->rxopt.all) 3874b261c75SHannes Frederic Sowa ip6_datagram_recv_specific_ctl(sk, msg, skb); 388db8dac20SDavid S. Miller } 389db8dac20SDavid S. Miller 39059c2cdaeSDavid S. Miller err = copied; 391db8dac20SDavid S. Miller if (flags & MSG_TRUNC) 392db8dac20SDavid S. Miller err = ulen; 393db8dac20SDavid S. Miller 394850cbaddSPaolo Abeni skb_consume_udp(sk, skb, peeking ? -err : err); 395db8dac20SDavid S. Miller return err; 396db8dac20SDavid S. Miller 397db8dac20SDavid S. Miller csum_copy_err: 3982276f58aSPaolo Abeni if (!__sk_queue_drop_skb(sk, &udp_sk(sk)->reader_queue, skb, flags, 3992276f58aSPaolo Abeni udp_skb_destructor)) { 400029a3743SPaolo Abeni SNMP_INC_STATS(mib, UDP_MIB_CSUMERRORS); 401029a3743SPaolo Abeni SNMP_INC_STATS(mib, UDP_MIB_INERRORS); 4026a5dc9e5SEric Dumazet } 403850cbaddSPaolo Abeni kfree_skb(skb); 404db8dac20SDavid S. Miller 405beb39db5SEric Dumazet /* starting over for a new packet, but check if we need to yield */ 406beb39db5SEric Dumazet cond_resched(); 4079cfaa8deSXufeng Zhang msg->msg_flags &= ~MSG_TRUNC; 408db8dac20SDavid S. Miller goto try_again; 409db8dac20SDavid S. Miller } 410db8dac20SDavid S. Miller 411a36e185eSStefano Brivio DEFINE_STATIC_KEY_FALSE(udpv6_encap_needed_key); 412a36e185eSStefano Brivio void udpv6_encap_enable(void) 413a36e185eSStefano Brivio { 4149c480601SPaolo Abeni static_branch_inc(&udpv6_encap_needed_key); 415a36e185eSStefano Brivio } 416a36e185eSStefano Brivio EXPORT_SYMBOL(udpv6_encap_enable); 417a36e185eSStefano Brivio 418e7cc0824SStefano Brivio /* Handler for tunnels with arbitrary destination ports: no socket lookup, go 419e7cc0824SStefano Brivio * through error handlers in encapsulations looking for a match. 420e7cc0824SStefano Brivio */ 421e7cc0824SStefano Brivio static int __udp6_lib_err_encap_no_sk(struct sk_buff *skb, 422e7cc0824SStefano Brivio struct inet6_skb_parm *opt, 423e7cc0824SStefano Brivio u8 type, u8 code, int offset, u32 info) 424e7cc0824SStefano Brivio { 425e7cc0824SStefano Brivio int i; 426e7cc0824SStefano Brivio 427e7cc0824SStefano Brivio for (i = 0; i < MAX_IPTUN_ENCAP_OPS; i++) { 428e7cc0824SStefano Brivio int (*handler)(struct sk_buff *skb, struct inet6_skb_parm *opt, 429e7cc0824SStefano Brivio u8 type, u8 code, int offset, u32 info); 430e7cc0824SStefano Brivio 431e7cc0824SStefano Brivio if (!ip6tun_encaps[i]) 432e7cc0824SStefano Brivio continue; 433e7cc0824SStefano Brivio handler = rcu_dereference(ip6tun_encaps[i]->err_handler); 434e7cc0824SStefano Brivio if (handler && !handler(skb, opt, type, code, offset, info)) 435e7cc0824SStefano Brivio return 0; 436e7cc0824SStefano Brivio } 437e7cc0824SStefano Brivio 438e7cc0824SStefano Brivio return -ENOENT; 439e7cc0824SStefano Brivio } 440e7cc0824SStefano Brivio 441a36e185eSStefano Brivio /* Try to match ICMP errors to UDP tunnels by looking up a socket without 442a36e185eSStefano Brivio * reversing source and destination port: this will match tunnels that force the 443a36e185eSStefano Brivio * same destination port on both endpoints (e.g. VXLAN, GENEVE). Note that 444a36e185eSStefano Brivio * lwtunnels might actually break this assumption by being configured with 445a36e185eSStefano Brivio * different destination ports on endpoints, in this case we won't be able to 446a36e185eSStefano Brivio * trace ICMP messages back to them. 447a36e185eSStefano Brivio * 448e7cc0824SStefano Brivio * If this doesn't match any socket, probe tunnels with arbitrary destination 449e7cc0824SStefano Brivio * ports (e.g. FoU, GUE): there, the receiving socket is useless, as the port 450e7cc0824SStefano Brivio * we've sent packets to won't necessarily match the local destination port. 451e7cc0824SStefano Brivio * 452a36e185eSStefano Brivio * Then ask the tunnel implementation to match the error against a valid 453a36e185eSStefano Brivio * association. 454a36e185eSStefano Brivio * 455e7cc0824SStefano Brivio * Return an error if we can't find a match, the socket if we need further 456e7cc0824SStefano Brivio * processing, zero otherwise. 457a36e185eSStefano Brivio */ 458a36e185eSStefano Brivio static struct sock *__udp6_lib_err_encap(struct net *net, 459a36e185eSStefano Brivio const struct ipv6hdr *hdr, int offset, 460a36e185eSStefano Brivio struct udphdr *uh, 461a36e185eSStefano Brivio struct udp_table *udptable, 462e7cc0824SStefano Brivio struct sk_buff *skb, 463e7cc0824SStefano Brivio struct inet6_skb_parm *opt, 464e7cc0824SStefano Brivio u8 type, u8 code, __be32 info) 465a36e185eSStefano Brivio { 466a36e185eSStefano Brivio int network_offset, transport_offset; 467a36e185eSStefano Brivio struct sock *sk; 468a36e185eSStefano Brivio 469a36e185eSStefano Brivio network_offset = skb_network_offset(skb); 470a36e185eSStefano Brivio transport_offset = skb_transport_offset(skb); 471a36e185eSStefano Brivio 472a36e185eSStefano Brivio /* Network header needs to point to the outer IPv6 header inside ICMP */ 473a36e185eSStefano Brivio skb_reset_network_header(skb); 474a36e185eSStefano Brivio 475a36e185eSStefano Brivio /* Transport header needs to point to the UDP header */ 476a36e185eSStefano Brivio skb_set_transport_header(skb, offset); 477a36e185eSStefano Brivio 478e7cc0824SStefano Brivio sk = __udp6_lib_lookup(net, &hdr->daddr, uh->source, 479e7cc0824SStefano Brivio &hdr->saddr, uh->dest, 480e7cc0824SStefano Brivio inet6_iif(skb), 0, udptable, skb); 481e7cc0824SStefano Brivio if (sk) { 482e7cc0824SStefano Brivio int (*lookup)(struct sock *sk, struct sk_buff *skb); 483e7cc0824SStefano Brivio struct udp_sock *up = udp_sk(sk); 484e7cc0824SStefano Brivio 485a36e185eSStefano Brivio lookup = READ_ONCE(up->encap_err_lookup); 486a36e185eSStefano Brivio if (!lookup || lookup(sk, skb)) 487a36e185eSStefano Brivio sk = NULL; 488e7cc0824SStefano Brivio } 489e7cc0824SStefano Brivio 490e7cc0824SStefano Brivio if (!sk) { 491e7cc0824SStefano Brivio sk = ERR_PTR(__udp6_lib_err_encap_no_sk(skb, opt, type, code, 492e7cc0824SStefano Brivio offset, info)); 493e7cc0824SStefano Brivio } 494a36e185eSStefano Brivio 495a36e185eSStefano Brivio skb_set_transport_header(skb, transport_offset); 496a36e185eSStefano Brivio skb_set_network_header(skb, network_offset); 497e7cc0824SStefano Brivio 498a36e185eSStefano Brivio return sk; 499a36e185eSStefano Brivio } 500a36e185eSStefano Brivio 50132bbd879SStefano Brivio int __udp6_lib_err(struct sk_buff *skb, struct inet6_skb_parm *opt, 502d5fdd6baSBrian Haley u8 type, u8 code, int offset, __be32 info, 503645ca708SEric Dumazet struct udp_table *udptable) 504db8dac20SDavid S. Miller { 505db8dac20SDavid S. Miller struct ipv6_pinfo *np; 506b71d1d42SEric Dumazet const struct ipv6hdr *hdr = (const struct ipv6hdr *)skb->data; 507b71d1d42SEric Dumazet const struct in6_addr *saddr = &hdr->saddr; 508b71d1d42SEric Dumazet const struct in6_addr *daddr = &hdr->daddr; 509db8dac20SDavid S. Miller struct udphdr *uh = (struct udphdr *)(skb->data+offset); 510a36e185eSStefano Brivio bool tunnel = false; 511db8dac20SDavid S. Miller struct sock *sk; 512e0d8c1b7SWei Wang int harderr; 513db8dac20SDavid S. Miller int err; 5147304fe46SDuan Jiong struct net *net = dev_net(skb->dev); 515db8dac20SDavid S. Miller 516e32ea7e7SCraig Gallek sk = __udp6_lib_lookup(net, daddr, uh->dest, saddr, uh->source, 517f64bf6b8SMike Manning inet6_iif(skb), inet6_sdif(skb), udptable, skb); 51863159f29SIan Morris if (!sk) { 519a36e185eSStefano Brivio /* No socket for error: try tunnels before discarding */ 520e7cc0824SStefano Brivio sk = ERR_PTR(-ENOENT); 521a36e185eSStefano Brivio if (static_branch_unlikely(&udpv6_encap_needed_key)) { 522a36e185eSStefano Brivio sk = __udp6_lib_err_encap(net, hdr, offset, uh, 523e7cc0824SStefano Brivio udptable, skb, 524e7cc0824SStefano Brivio opt, type, code, info); 525e7cc0824SStefano Brivio if (!sk) 526e7cc0824SStefano Brivio return 0; 527a36e185eSStefano Brivio } 528a36e185eSStefano Brivio 529e7cc0824SStefano Brivio if (IS_ERR(sk)) { 530a16292a0SEric Dumazet __ICMP6_INC_STATS(net, __in6_dev_get(skb->dev), 5317304fe46SDuan Jiong ICMP6_MIB_INERRORS); 532e7cc0824SStefano Brivio return PTR_ERR(sk); 5337304fe46SDuan Jiong } 534e7cc0824SStefano Brivio 535a36e185eSStefano Brivio tunnel = true; 536a36e185eSStefano Brivio } 537db8dac20SDavid S. Miller 538e0d8c1b7SWei Wang harderr = icmpv6_err_convert(type, code, &err); 539e0d8c1b7SWei Wang np = inet6_sk(sk); 540e0d8c1b7SWei Wang 54193b36cf3SHannes Frederic Sowa if (type == ICMPV6_PKT_TOOBIG) { 54293b36cf3SHannes Frederic Sowa if (!ip6_sk_accept_pmtu(sk)) 54393b36cf3SHannes Frederic Sowa goto out; 54481aded24SDavid S. Miller ip6_sk_update_pmtu(skb, sk, info); 545e0d8c1b7SWei Wang if (np->pmtudisc != IPV6_PMTUDISC_DONT) 546e0d8c1b7SWei Wang harderr = 1; 54793b36cf3SHannes Frederic Sowa } 5481a462d18SDuan Jiong if (type == NDISC_REDIRECT) { 549a36e185eSStefano Brivio if (tunnel) { 550a36e185eSStefano Brivio ip6_redirect(skb, sock_net(sk), inet6_iif(skb), 551a36e185eSStefano Brivio sk->sk_mark, sk->sk_uid); 552a36e185eSStefano Brivio } else { 553ec18d9a2SDavid S. Miller ip6_sk_redirect(skb, sk); 554a36e185eSStefano Brivio } 5551a462d18SDuan Jiong goto out; 5561a462d18SDuan Jiong } 55781aded24SDavid S. Miller 558a36e185eSStefano Brivio /* Tunnels don't have an application socket: don't pass errors back */ 559a36e185eSStefano Brivio if (tunnel) 560a36e185eSStefano Brivio goto out; 561a36e185eSStefano Brivio 562e0d8c1b7SWei Wang if (!np->recverr) { 563e0d8c1b7SWei Wang if (!harderr || sk->sk_state != TCP_ESTABLISHED) 564db8dac20SDavid S. Miller goto out; 565e0d8c1b7SWei Wang } else { 566db8dac20SDavid S. Miller ipv6_icmp_error(sk, skb, err, uh->dest, ntohl(info), (u8 *)(uh+1)); 567e0d8c1b7SWei Wang } 568b1faf566SEric Dumazet 569db8dac20SDavid S. Miller sk->sk_err = err; 570db8dac20SDavid S. Miller sk->sk_error_report(sk); 571db8dac20SDavid S. Miller out: 57232bbd879SStefano Brivio return 0; 573db8dac20SDavid S. Miller } 574db8dac20SDavid S. Miller 575a3f96c47SPaolo Abeni static int __udpv6_queue_rcv_skb(struct sock *sk, struct sk_buff *skb) 576f7ad74feSBenjamin LaHaise { 577f7ad74feSBenjamin LaHaise int rc; 578f7ad74feSBenjamin LaHaise 579efe4208fSEric Dumazet if (!ipv6_addr_any(&sk->sk_v6_daddr)) { 580f7ad74feSBenjamin LaHaise sock_rps_save_rxhash(sk, skb); 581005ec974SShawn Bohrer sk_mark_napi_id(sk, skb); 5822c8c56e1SEric Dumazet sk_incoming_cpu_update(sk); 583e68b6e50SEric Dumazet } else { 584e68b6e50SEric Dumazet sk_mark_napi_id_once(sk, skb); 585005ec974SShawn Bohrer } 586f7ad74feSBenjamin LaHaise 587850cbaddSPaolo Abeni rc = __udp_enqueue_schedule_skb(sk, skb); 588f7ad74feSBenjamin LaHaise if (rc < 0) { 589f7ad74feSBenjamin LaHaise int is_udplite = IS_UDPLITE(sk); 590f7ad74feSBenjamin LaHaise 591f7ad74feSBenjamin LaHaise /* Note that an ENOMEM error is charged twice */ 592f7ad74feSBenjamin LaHaise if (rc == -ENOMEM) 593e61da9e2SEric Dumazet UDP6_INC_STATS(sock_net(sk), 594f7ad74feSBenjamin LaHaise UDP_MIB_RCVBUFERRORS, is_udplite); 595e61da9e2SEric Dumazet UDP6_INC_STATS(sock_net(sk), UDP_MIB_INERRORS, is_udplite); 596f7ad74feSBenjamin LaHaise kfree_skb(skb); 597f7ad74feSBenjamin LaHaise return -1; 598f7ad74feSBenjamin LaHaise } 599850cbaddSPaolo Abeni 600f7ad74feSBenjamin LaHaise return 0; 601f7ad74feSBenjamin LaHaise } 602f7ad74feSBenjamin LaHaise 60332bbd879SStefano Brivio static __inline__ int udpv6_err(struct sk_buff *skb, 604d5fdd6baSBrian Haley struct inet6_skb_parm *opt, u8 type, 605d5fdd6baSBrian Haley u8 code, int offset, __be32 info) 606db8dac20SDavid S. Miller { 60732bbd879SStefano Brivio return __udp6_lib_err(skb, opt, type, code, offset, info, &udp_table); 608db8dac20SDavid S. Miller } 609db8dac20SDavid S. Miller 610cf329aa4SPaolo Abeni static int udpv6_queue_rcv_one_skb(struct sock *sk, struct sk_buff *skb) 611db8dac20SDavid S. Miller { 612db8dac20SDavid S. Miller struct udp_sock *up = udp_sk(sk); 613db8dac20SDavid S. Miller int is_udplite = IS_UDPLITE(sk); 614db8dac20SDavid S. Miller 615db8dac20SDavid S. Miller if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb)) 616db8dac20SDavid S. Miller goto drop; 617db8dac20SDavid S. Miller 61888ab3108SDavidlohr Bueso if (static_branch_unlikely(&udpv6_encap_needed_key) && up->encap_type) { 619d7f3f621SBenjamin LaHaise int (*encap_rcv)(struct sock *sk, struct sk_buff *skb); 620d7f3f621SBenjamin LaHaise 621d7f3f621SBenjamin LaHaise /* 622d7f3f621SBenjamin LaHaise * This is an encapsulation socket so pass the skb to 623d7f3f621SBenjamin LaHaise * the socket's udp_encap_rcv() hook. Otherwise, just 624d7f3f621SBenjamin LaHaise * fall through and pass this up the UDP socket. 625d7f3f621SBenjamin LaHaise * up->encap_rcv() returns the following value: 626d7f3f621SBenjamin LaHaise * =0 if skb was successfully passed to the encap 627d7f3f621SBenjamin LaHaise * handler or was discarded by it. 628d7f3f621SBenjamin LaHaise * >0 if skb should be passed on to UDP. 629d7f3f621SBenjamin LaHaise * <0 if skb should be resubmitted as proto -N 630d7f3f621SBenjamin LaHaise */ 631d7f3f621SBenjamin LaHaise 632d7f3f621SBenjamin LaHaise /* if we're overly short, let UDP handle it */ 6336aa7de05SMark Rutland encap_rcv = READ_ONCE(up->encap_rcv); 634e5aed006SHannes Frederic Sowa if (encap_rcv) { 635d7f3f621SBenjamin LaHaise int ret; 636d7f3f621SBenjamin LaHaise 6370a80966bSTom Herbert /* Verify checksum before giving to encap */ 6380a80966bSTom Herbert if (udp_lib_checksum_complete(skb)) 6390a80966bSTom Herbert goto csum_error; 6400a80966bSTom Herbert 641d7f3f621SBenjamin LaHaise ret = encap_rcv(sk, skb); 642d7f3f621SBenjamin LaHaise if (ret <= 0) { 64302c22347SEric Dumazet __UDP_INC_STATS(sock_net(sk), 644d7f3f621SBenjamin LaHaise UDP_MIB_INDATAGRAMS, 645d7f3f621SBenjamin LaHaise is_udplite); 646d7f3f621SBenjamin LaHaise return -ret; 647d7f3f621SBenjamin LaHaise } 648d7f3f621SBenjamin LaHaise } 649d7f3f621SBenjamin LaHaise 650d7f3f621SBenjamin LaHaise /* FALLTHROUGH -- it's a UDP Packet */ 651d7f3f621SBenjamin LaHaise } 652d7f3f621SBenjamin LaHaise 653db8dac20SDavid S. Miller /* 654db8dac20SDavid S. Miller * UDP-Lite specific tests, ignored on UDP sockets (see net/ipv4/udp.c). 655db8dac20SDavid S. Miller */ 656db8dac20SDavid S. Miller if ((is_udplite & UDPLITE_RECV_CC) && UDP_SKB_CB(skb)->partial_cov) { 657db8dac20SDavid S. Miller 658db8dac20SDavid S. Miller if (up->pcrlen == 0) { /* full coverage was set */ 659ba7a46f1SJoe Perches net_dbg_ratelimited("UDPLITE6: partial coverage %d while full coverage %d requested\n", 660db8dac20SDavid S. Miller UDP_SKB_CB(skb)->cscov, skb->len); 661db8dac20SDavid S. Miller goto drop; 662db8dac20SDavid S. Miller } 663db8dac20SDavid S. Miller if (UDP_SKB_CB(skb)->cscov < up->pcrlen) { 664ba7a46f1SJoe Perches net_dbg_ratelimited("UDPLITE6: coverage %d too small, need min %d\n", 665db8dac20SDavid S. Miller UDP_SKB_CB(skb)->cscov, up->pcrlen); 666db8dac20SDavid S. Miller goto drop; 667db8dac20SDavid S. Miller } 668db8dac20SDavid S. Miller } 669db8dac20SDavid S. Miller 6704b943faeSPaolo Abeni prefetch(&sk->sk_rmem_alloc); 671ce25d66aSEric Dumazet if (rcu_access_pointer(sk->sk_filter) && 672ce25d66aSEric Dumazet udp_lib_checksum_complete(skb)) 6736a5dc9e5SEric Dumazet goto csum_error; 674ce25d66aSEric Dumazet 675ba66bbe5SDaniel Borkmann if (sk_filter_trim_cap(sk, skb, sizeof(struct udphdr))) 676a6127697SMichal Kubeček goto drop; 677db8dac20SDavid S. Miller 678e6afc8acSsamanthakumar udp_csum_pull_header(skb); 679cb80ef46SBenjamin LaHaise 680d826eb14SEric Dumazet skb_dst_drop(skb); 681db8dac20SDavid S. Miller 682850cbaddSPaolo Abeni return __udpv6_queue_rcv_skb(sk, skb); 6833e215c8dSJames M Leddy 6846a5dc9e5SEric Dumazet csum_error: 68502c22347SEric Dumazet __UDP6_INC_STATS(sock_net(sk), UDP_MIB_CSUMERRORS, is_udplite); 686db8dac20SDavid S. Miller drop: 68702c22347SEric Dumazet __UDP6_INC_STATS(sock_net(sk), UDP_MIB_INERRORS, is_udplite); 688cb80ef46SBenjamin LaHaise atomic_inc(&sk->sk_drops); 689db8dac20SDavid S. Miller kfree_skb(skb); 690db8dac20SDavid S. Miller return -1; 691db8dac20SDavid S. Miller } 692db8dac20SDavid S. Miller 693cf329aa4SPaolo Abeni static int udpv6_queue_rcv_skb(struct sock *sk, struct sk_buff *skb) 694cf329aa4SPaolo Abeni { 695cf329aa4SPaolo Abeni struct sk_buff *next, *segs; 696cf329aa4SPaolo Abeni int ret; 697cf329aa4SPaolo Abeni 698cf329aa4SPaolo Abeni if (likely(!udp_unexpected_gso(sk, skb))) 699cf329aa4SPaolo Abeni return udpv6_queue_rcv_one_skb(sk, skb); 700cf329aa4SPaolo Abeni 701cf329aa4SPaolo Abeni __skb_push(skb, -skb_mac_offset(skb)); 702cf329aa4SPaolo Abeni segs = udp_rcv_segment(sk, skb, false); 703cf329aa4SPaolo Abeni for (skb = segs; skb; skb = next) { 704cf329aa4SPaolo Abeni next = skb->next; 705cf329aa4SPaolo Abeni __skb_pull(skb, skb_transport_offset(skb)); 706cf329aa4SPaolo Abeni 707cf329aa4SPaolo Abeni ret = udpv6_queue_rcv_one_skb(sk, skb); 708cf329aa4SPaolo Abeni if (ret > 0) 709cf329aa4SPaolo Abeni ip6_protocol_deliver_rcu(dev_net(skb->dev), skb, ret, 710cf329aa4SPaolo Abeni true); 711cf329aa4SPaolo Abeni } 712cf329aa4SPaolo Abeni return 0; 713cf329aa4SPaolo Abeni } 714cf329aa4SPaolo Abeni 7155cf3d461SDavid Held static bool __udp_v6_is_mcast_sock(struct net *net, struct sock *sk, 716b71d1d42SEric Dumazet __be16 loc_port, const struct in6_addr *loc_addr, 717b71d1d42SEric Dumazet __be16 rmt_port, const struct in6_addr *rmt_addr, 7187bd2db40SDewi Morgan int dif, int sdif, unsigned short hnum) 719db8dac20SDavid S. Miller { 7209e89fd8bSSven Wegener struct inet_sock *inet = inet_sk(sk); 721db8dac20SDavid S. Miller 7229e89fd8bSSven Wegener if (!net_eq(sock_net(sk), net)) 7235cf3d461SDavid Held return false; 724b8ad0cbcSDaniel Lezcano 7255cf3d461SDavid Held if (udp_sk(sk)->udp_port_hash != hnum || 7265cf3d461SDavid Held sk->sk_family != PF_INET6 || 7275cf3d461SDavid Held (inet->inet_dport && inet->inet_dport != rmt_port) || 7285cf3d461SDavid Held (!ipv6_addr_any(&sk->sk_v6_daddr) && 7295cf3d461SDavid Held !ipv6_addr_equal(&sk->sk_v6_daddr, rmt_addr)) || 7307bd2db40SDewi Morgan !udp_sk_bound_dev_eq(net, sk->sk_bound_dev_if, dif, sdif) || 73133b4b015SHenning Rogge (!ipv6_addr_any(&sk->sk_v6_rcv_saddr) && 73233b4b015SHenning Rogge !ipv6_addr_equal(&sk->sk_v6_rcv_saddr, loc_addr))) 7335cf3d461SDavid Held return false; 7349e89fd8bSSven Wegener if (!inet6_mc_check(sk, loc_addr, rmt_addr)) 7355cf3d461SDavid Held return false; 7365cf3d461SDavid Held return true; 737db8dac20SDavid S. Miller } 738db8dac20SDavid S. Miller 7394068579eSTom Herbert static void udp6_csum_zero_error(struct sk_buff *skb) 7404068579eSTom Herbert { 7414068579eSTom Herbert /* RFC 2460 section 8.1 says that we SHOULD log 7424068579eSTom Herbert * this error. Well, it is reasonable. 7434068579eSTom Herbert */ 744ba7a46f1SJoe Perches net_dbg_ratelimited("IPv6: udp checksum is 0 for [%pI6c]:%u->[%pI6c]:%u\n", 7454068579eSTom Herbert &ipv6_hdr(skb)->saddr, ntohs(udp_hdr(skb)->source), 7464068579eSTom Herbert &ipv6_hdr(skb)->daddr, ntohs(udp_hdr(skb)->dest)); 7474068579eSTom Herbert } 7484068579eSTom Herbert 749db8dac20SDavid S. Miller /* 750db8dac20SDavid S. Miller * Note: called only from the BH handler context, 751db8dac20SDavid S. Miller * so we don't need to lock the hashes. 752db8dac20SDavid S. Miller */ 753e3163493SPavel Emelyanov static int __udp6_lib_mcast_deliver(struct net *net, struct sk_buff *skb, 754b71d1d42SEric Dumazet const struct in6_addr *saddr, const struct in6_addr *daddr, 75536cbb245SRick Jones struct udp_table *udptable, int proto) 756db8dac20SDavid S. Miller { 757ca065d0cSEric Dumazet struct sock *sk, *first = NULL; 758db8dac20SDavid S. Miller const struct udphdr *uh = udp_hdr(skb); 7595cf3d461SDavid Held unsigned short hnum = ntohs(uh->dest); 7605cf3d461SDavid Held struct udp_hslot *hslot = udp_hashslot(udptable, net, hnum); 761ca065d0cSEric Dumazet unsigned int offset = offsetof(typeof(*sk), sk_node); 7622dc41cffSDavid Held unsigned int hash2 = 0, hash2_any = 0, use_hash2 = (hslot->count > 10); 763ca065d0cSEric Dumazet int dif = inet6_iif(skb); 7647bd2db40SDewi Morgan int sdif = inet6_sdif(skb); 765ca065d0cSEric Dumazet struct hlist_node *node; 766ca065d0cSEric Dumazet struct sk_buff *nskb; 7672dc41cffSDavid Held 7682dc41cffSDavid Held if (use_hash2) { 769f0b1e64cSMartin KaFai Lau hash2_any = ipv6_portaddr_hash(net, &in6addr_any, hnum) & 77073e2d5e3SPablo Neira udptable->mask; 771f0b1e64cSMartin KaFai Lau hash2 = ipv6_portaddr_hash(net, daddr, hnum) & udptable->mask; 7722dc41cffSDavid Held start_lookup: 77373e2d5e3SPablo Neira hslot = &udptable->hash2[hash2]; 7742dc41cffSDavid Held offset = offsetof(typeof(*sk), __sk_common.skc_portaddr_node); 7752dc41cffSDavid Held } 776db8dac20SDavid S. Miller 777ca065d0cSEric Dumazet sk_for_each_entry_offset_rcu(sk, node, &hslot->head, offset) { 778ca065d0cSEric Dumazet if (!__udp_v6_is_mcast_sock(net, sk, uh->dest, daddr, 7797bd2db40SDewi Morgan uh->source, saddr, dif, sdif, 7807bd2db40SDewi Morgan hnum)) 781ca065d0cSEric Dumazet continue; 7821c19448cSTom Herbert /* If zero checksum and no_check is not on for 7834068579eSTom Herbert * the socket then skip it. 7844068579eSTom Herbert */ 785ca065d0cSEric Dumazet if (!uh->check && !udp_sk(sk)->no_check6_rx) 786ca065d0cSEric Dumazet continue; 787ca065d0cSEric Dumazet if (!first) { 788ca065d0cSEric Dumazet first = sk; 789ca065d0cSEric Dumazet continue; 790db8dac20SDavid S. Miller } 791ca065d0cSEric Dumazet nskb = skb_clone(skb, GFP_ATOMIC); 792ca065d0cSEric Dumazet if (unlikely(!nskb)) { 793ca065d0cSEric Dumazet atomic_inc(&sk->sk_drops); 79402c22347SEric Dumazet __UDP6_INC_STATS(net, UDP_MIB_RCVBUFERRORS, 795ca065d0cSEric Dumazet IS_UDPLITE(sk)); 79602c22347SEric Dumazet __UDP6_INC_STATS(net, UDP_MIB_INERRORS, 797ca065d0cSEric Dumazet IS_UDPLITE(sk)); 798ca065d0cSEric Dumazet continue; 799a1ab77f9SEric Dumazet } 800db8dac20SDavid S. Miller 801ca065d0cSEric Dumazet if (udpv6_queue_rcv_skb(sk, nskb) > 0) 802ca065d0cSEric Dumazet consume_skb(nskb); 803ca065d0cSEric Dumazet } 804a1ab77f9SEric Dumazet 8052dc41cffSDavid Held /* Also lookup *:port if we are using hash2 and haven't done so yet. */ 8062dc41cffSDavid Held if (use_hash2 && hash2 != hash2_any) { 8072dc41cffSDavid Held hash2 = hash2_any; 8082dc41cffSDavid Held goto start_lookup; 8092dc41cffSDavid Held } 8102dc41cffSDavid Held 811ca065d0cSEric Dumazet if (first) { 812ca065d0cSEric Dumazet if (udpv6_queue_rcv_skb(first, skb) > 0) 813ca065d0cSEric Dumazet consume_skb(skb); 814a1ab77f9SEric Dumazet } else { 815ca065d0cSEric Dumazet kfree_skb(skb); 81602c22347SEric Dumazet __UDP6_INC_STATS(net, UDP_MIB_IGNOREDMULTI, 81736cbb245SRick Jones proto == IPPROTO_UDPLITE); 818a1ab77f9SEric Dumazet } 819db8dac20SDavid S. Miller return 0; 820db8dac20SDavid S. Miller } 821db8dac20SDavid S. Miller 82264f0f5d1SPaolo Abeni static void udp6_sk_rx_dst_set(struct sock *sk, struct dst_entry *dst) 82364f0f5d1SPaolo Abeni { 82464f0f5d1SPaolo Abeni if (udp_sk_rx_dst_set(sk, dst)) { 82564f0f5d1SPaolo Abeni const struct rt6_info *rt = (const struct rt6_info *)dst; 82664f0f5d1SPaolo Abeni 82764f0f5d1SPaolo Abeni inet6_sk(sk)->rx_dst_cookie = rt6_get_cookie(rt); 82864f0f5d1SPaolo Abeni } 82964f0f5d1SPaolo Abeni } 83064f0f5d1SPaolo Abeni 831eb63f296SPaolo Abeni /* wrapper for udp_queue_rcv_skb tacking care of csum conversion and 832eb63f296SPaolo Abeni * return code conversion for ip layer consumption 833eb63f296SPaolo Abeni */ 834eb63f296SPaolo Abeni static int udp6_unicast_rcv_skb(struct sock *sk, struct sk_buff *skb, 835eb63f296SPaolo Abeni struct udphdr *uh) 836eb63f296SPaolo Abeni { 837eb63f296SPaolo Abeni int ret; 838eb63f296SPaolo Abeni 839eb63f296SPaolo Abeni if (inet_get_convert_csum(sk) && uh->check && !IS_UDPLITE(sk)) 840eb63f296SPaolo Abeni skb_checksum_try_convert(skb, IPPROTO_UDP, uh->check, 841eb63f296SPaolo Abeni ip6_compute_pseudo); 842eb63f296SPaolo Abeni 843eb63f296SPaolo Abeni ret = udpv6_queue_rcv_skb(sk, skb); 844eb63f296SPaolo Abeni 84584dad559SPaolo Abeni /* a return value > 0 means to resubmit the input */ 846eb63f296SPaolo Abeni if (ret > 0) 84784dad559SPaolo Abeni return ret; 848eb63f296SPaolo Abeni return 0; 849eb63f296SPaolo Abeni } 850eb63f296SPaolo Abeni 851645ca708SEric Dumazet int __udp6_lib_rcv(struct sk_buff *skb, struct udp_table *udptable, 852db8dac20SDavid S. Miller int proto) 853db8dac20SDavid S. Miller { 854b71d1d42SEric Dumazet const struct in6_addr *saddr, *daddr; 855ca065d0cSEric Dumazet struct net *net = dev_net(skb->dev); 856ca065d0cSEric Dumazet struct udphdr *uh; 857ca065d0cSEric Dumazet struct sock *sk; 858db8dac20SDavid S. Miller u32 ulen = 0; 859db8dac20SDavid S. Miller 860db8dac20SDavid S. Miller if (!pskb_may_pull(skb, sizeof(struct udphdr))) 861d6bc0149SBjørn Mork goto discard; 862db8dac20SDavid S. Miller 863db8dac20SDavid S. Miller saddr = &ipv6_hdr(skb)->saddr; 864db8dac20SDavid S. Miller daddr = &ipv6_hdr(skb)->daddr; 865db8dac20SDavid S. Miller uh = udp_hdr(skb); 866db8dac20SDavid S. Miller 867db8dac20SDavid S. Miller ulen = ntohs(uh->len); 868db8dac20SDavid S. Miller if (ulen > skb->len) 869db8dac20SDavid S. Miller goto short_packet; 870db8dac20SDavid S. Miller 871db8dac20SDavid S. Miller if (proto == IPPROTO_UDP) { 872db8dac20SDavid S. Miller /* UDP validates ulen. */ 873db8dac20SDavid S. Miller 874db8dac20SDavid S. Miller /* Check for jumbo payload */ 875db8dac20SDavid S. Miller if (ulen == 0) 876db8dac20SDavid S. Miller ulen = skb->len; 877db8dac20SDavid S. Miller 878db8dac20SDavid S. Miller if (ulen < sizeof(*uh)) 879db8dac20SDavid S. Miller goto short_packet; 880db8dac20SDavid S. Miller 881db8dac20SDavid S. Miller if (ulen < skb->len) { 882db8dac20SDavid S. Miller if (pskb_trim_rcsum(skb, ulen)) 883db8dac20SDavid S. Miller goto short_packet; 884db8dac20SDavid S. Miller saddr = &ipv6_hdr(skb)->saddr; 885db8dac20SDavid S. Miller daddr = &ipv6_hdr(skb)->daddr; 886db8dac20SDavid S. Miller uh = udp_hdr(skb); 887db8dac20SDavid S. Miller } 888db8dac20SDavid S. Miller } 889db8dac20SDavid S. Miller 890db8dac20SDavid S. Miller if (udp6_csum_init(skb, uh, proto)) 8916a5dc9e5SEric Dumazet goto csum_error; 892db8dac20SDavid S. Miller 893c9f2c1aeSPaolo Abeni /* Check if the socket is already available, e.g. due to early demux */ 894c9f2c1aeSPaolo Abeni sk = skb_steal_sock(skb); 895c9f2c1aeSPaolo Abeni if (sk) { 896c9f2c1aeSPaolo Abeni struct dst_entry *dst = skb_dst(skb); 897c9f2c1aeSPaolo Abeni int ret; 898c9f2c1aeSPaolo Abeni 899c9f2c1aeSPaolo Abeni if (unlikely(sk->sk_rx_dst != dst)) 90064f0f5d1SPaolo Abeni udp6_sk_rx_dst_set(sk, dst); 901c9f2c1aeSPaolo Abeni 902eb63f296SPaolo Abeni if (!uh->check && !udp_sk(sk)->no_check6_rx) { 903c9f2c1aeSPaolo Abeni sock_put(sk); 904eb63f296SPaolo Abeni goto report_csum_error; 905eb63f296SPaolo Abeni } 906c9f2c1aeSPaolo Abeni 907eb63f296SPaolo Abeni ret = udp6_unicast_rcv_skb(sk, skb, uh); 908eb63f296SPaolo Abeni sock_put(sk); 909c9f2c1aeSPaolo Abeni return ret; 910c9f2c1aeSPaolo Abeni } 911c9f2c1aeSPaolo Abeni 912db8dac20SDavid S. Miller /* 913db8dac20SDavid S. Miller * Multicast receive code 914db8dac20SDavid S. Miller */ 915db8dac20SDavid S. Miller if (ipv6_addr_is_multicast(daddr)) 916e3163493SPavel Emelyanov return __udp6_lib_mcast_deliver(net, skb, 91736cbb245SRick Jones saddr, daddr, udptable, proto); 918db8dac20SDavid S. Miller 919db8dac20SDavid S. Miller /* Unicast */ 920607c4aafSKOVACS Krisztian sk = __udp6_lib_lookup_skb(skb, uh->source, uh->dest, udptable); 92153b24b8fSIan Morris if (sk) { 922eb63f296SPaolo Abeni if (!uh->check && !udp_sk(sk)->no_check6_rx) 923eb63f296SPaolo Abeni goto report_csum_error; 924eb63f296SPaolo Abeni return udp6_unicast_rcv_skb(sk, skb, uh); 9254068579eSTom Herbert } 9264068579eSTom Herbert 927eb63f296SPaolo Abeni if (!uh->check) 928eb63f296SPaolo Abeni goto report_csum_error; 9294068579eSTom Herbert 930db8dac20SDavid S. Miller if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) 931db8dac20SDavid S. Miller goto discard; 932db8dac20SDavid S. Miller 933db8dac20SDavid S. Miller if (udp_lib_checksum_complete(skb)) 9346a5dc9e5SEric Dumazet goto csum_error; 935db8dac20SDavid S. Miller 93602c22347SEric Dumazet __UDP6_INC_STATS(net, UDP_MIB_NOPORTS, proto == IPPROTO_UDPLITE); 9373ffe533cSAlexey Dobriyan icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0); 938db8dac20SDavid S. Miller 939db8dac20SDavid S. Miller kfree_skb(skb); 940db8dac20SDavid S. Miller return 0; 941db8dac20SDavid S. Miller 942db8dac20SDavid S. Miller short_packet: 943ba7a46f1SJoe Perches net_dbg_ratelimited("UDP%sv6: short packet: From [%pI6c]:%u %d/%d to [%pI6c]:%u\n", 944db8dac20SDavid S. Miller proto == IPPROTO_UDPLITE ? "-Lite" : "", 945ba7a46f1SJoe Perches saddr, ntohs(uh->source), 946ba7a46f1SJoe Perches ulen, skb->len, 947ba7a46f1SJoe Perches daddr, ntohs(uh->dest)); 9486a5dc9e5SEric Dumazet goto discard; 949eb63f296SPaolo Abeni 950eb63f296SPaolo Abeni report_csum_error: 951eb63f296SPaolo Abeni udp6_csum_zero_error(skb); 9526a5dc9e5SEric Dumazet csum_error: 95302c22347SEric Dumazet __UDP6_INC_STATS(net, UDP_MIB_CSUMERRORS, proto == IPPROTO_UDPLITE); 954db8dac20SDavid S. Miller discard: 95502c22347SEric Dumazet __UDP6_INC_STATS(net, UDP_MIB_INERRORS, proto == IPPROTO_UDPLITE); 956db8dac20SDavid S. Miller kfree_skb(skb); 957db8dac20SDavid S. Miller return 0; 958db8dac20SDavid S. Miller } 959db8dac20SDavid S. Miller 9600bd84065Ssubashab@codeaurora.org 9615425077dSsubashab@codeaurora.org static struct sock *__udp6_lib_demux_lookup(struct net *net, 9625425077dSsubashab@codeaurora.org __be16 loc_port, const struct in6_addr *loc_addr, 9635425077dSsubashab@codeaurora.org __be16 rmt_port, const struct in6_addr *rmt_addr, 9644297a0efSDavid Ahern int dif, int sdif) 9655425077dSsubashab@codeaurora.org { 9660bd84065Ssubashab@codeaurora.org unsigned short hnum = ntohs(loc_port); 967f0b1e64cSMartin KaFai Lau unsigned int hash2 = ipv6_portaddr_hash(net, loc_addr, hnum); 9680bd84065Ssubashab@codeaurora.org unsigned int slot2 = hash2 & udp_table.mask; 9690bd84065Ssubashab@codeaurora.org struct udp_hslot *hslot2 = &udp_table.hash2[slot2]; 9700bd84065Ssubashab@codeaurora.org const __portpair ports = INET_COMBINED_PORTS(rmt_port, hnum); 9715425077dSsubashab@codeaurora.org struct sock *sk; 9725425077dSsubashab@codeaurora.org 9730bd84065Ssubashab@codeaurora.org udp_portaddr_for_each_entry_rcu(sk, &hslot2->head) { 97485cb73ffSWei Wang if (sk->sk_state == TCP_ESTABLISHED && 9754297a0efSDavid Ahern INET6_MATCH(sk, net, rmt_addr, loc_addr, ports, dif, sdif)) 9765425077dSsubashab@codeaurora.org return sk; 9770bd84065Ssubashab@codeaurora.org /* Only check first socket in chain */ 9780bd84065Ssubashab@codeaurora.org break; 9790bd84065Ssubashab@codeaurora.org } 9800bd84065Ssubashab@codeaurora.org return NULL; 9815425077dSsubashab@codeaurora.org } 9825425077dSsubashab@codeaurora.org 9835425077dSsubashab@codeaurora.org static void udp_v6_early_demux(struct sk_buff *skb) 9845425077dSsubashab@codeaurora.org { 9855425077dSsubashab@codeaurora.org struct net *net = dev_net(skb->dev); 9865425077dSsubashab@codeaurora.org const struct udphdr *uh; 9875425077dSsubashab@codeaurora.org struct sock *sk; 9885425077dSsubashab@codeaurora.org struct dst_entry *dst; 9895425077dSsubashab@codeaurora.org int dif = skb->dev->ifindex; 9904297a0efSDavid Ahern int sdif = inet6_sdif(skb); 9915425077dSsubashab@codeaurora.org 9925425077dSsubashab@codeaurora.org if (!pskb_may_pull(skb, skb_transport_offset(skb) + 9935425077dSsubashab@codeaurora.org sizeof(struct udphdr))) 9945425077dSsubashab@codeaurora.org return; 9955425077dSsubashab@codeaurora.org 9965425077dSsubashab@codeaurora.org uh = udp_hdr(skb); 9975425077dSsubashab@codeaurora.org 9985425077dSsubashab@codeaurora.org if (skb->pkt_type == PACKET_HOST) 9995425077dSsubashab@codeaurora.org sk = __udp6_lib_demux_lookup(net, uh->dest, 10005425077dSsubashab@codeaurora.org &ipv6_hdr(skb)->daddr, 10015425077dSsubashab@codeaurora.org uh->source, &ipv6_hdr(skb)->saddr, 10024297a0efSDavid Ahern dif, sdif); 10035425077dSsubashab@codeaurora.org else 10045425077dSsubashab@codeaurora.org return; 10055425077dSsubashab@codeaurora.org 100641c6d650SReshetova, Elena if (!sk || !refcount_inc_not_zero(&sk->sk_refcnt)) 10075425077dSsubashab@codeaurora.org return; 10085425077dSsubashab@codeaurora.org 10095425077dSsubashab@codeaurora.org skb->sk = sk; 10105425077dSsubashab@codeaurora.org skb->destructor = sock_efree; 10115425077dSsubashab@codeaurora.org dst = READ_ONCE(sk->sk_rx_dst); 10125425077dSsubashab@codeaurora.org 10135425077dSsubashab@codeaurora.org if (dst) 10145425077dSsubashab@codeaurora.org dst = dst_check(dst, inet6_sk(sk)->rx_dst_cookie); 10155425077dSsubashab@codeaurora.org if (dst) { 1016d24406c8SWei Wang /* set noref for now. 1017d24406c8SWei Wang * any place which wants to hold dst has to call 1018d24406c8SWei Wang * dst_hold_safe() 1019d24406c8SWei Wang */ 10205425077dSsubashab@codeaurora.org skb_dst_set_noref(skb, dst); 10215425077dSsubashab@codeaurora.org } 10225425077dSsubashab@codeaurora.org } 10235425077dSsubashab@codeaurora.org 1024db8dac20SDavid S. Miller static __inline__ int udpv6_rcv(struct sk_buff *skb) 1025db8dac20SDavid S. Miller { 1026645ca708SEric Dumazet return __udp6_lib_rcv(skb, &udp_table, IPPROTO_UDP); 1027db8dac20SDavid S. Miller } 1028db8dac20SDavid S. Miller 1029db8dac20SDavid S. Miller /* 1030db8dac20SDavid S. Miller * Throw away all pending data and cancel the corking. Socket is locked. 1031db8dac20SDavid S. Miller */ 1032db8dac20SDavid S. Miller static void udp_v6_flush_pending_frames(struct sock *sk) 1033db8dac20SDavid S. Miller { 1034db8dac20SDavid S. Miller struct udp_sock *up = udp_sk(sk); 1035db8dac20SDavid S. Miller 103636d926b9SDenis V. Lunev if (up->pending == AF_INET) 103736d926b9SDenis V. Lunev udp_flush_pending_frames(sk); 103836d926b9SDenis V. Lunev else if (up->pending) { 1039db8dac20SDavid S. Miller up->len = 0; 1040db8dac20SDavid S. Miller up->pending = 0; 1041db8dac20SDavid S. Miller ip6_flush_pending_frames(sk); 1042db8dac20SDavid S. Miller } 1043db8dac20SDavid S. Miller } 1044db8dac20SDavid S. Miller 1045d74bad4eSAndrey Ignatov static int udpv6_pre_connect(struct sock *sk, struct sockaddr *uaddr, 1046d74bad4eSAndrey Ignatov int addr_len) 1047d74bad4eSAndrey Ignatov { 1048d74bad4eSAndrey Ignatov /* The following checks are replicated from __ip6_datagram_connect() 1049d74bad4eSAndrey Ignatov * and intended to prevent BPF program called below from accessing 1050d74bad4eSAndrey Ignatov * bytes that are out of the bound specified by user in addr_len. 1051d74bad4eSAndrey Ignatov */ 1052d74bad4eSAndrey Ignatov if (uaddr->sa_family == AF_INET) { 1053d74bad4eSAndrey Ignatov if (__ipv6_only_sock(sk)) 1054d74bad4eSAndrey Ignatov return -EAFNOSUPPORT; 1055d74bad4eSAndrey Ignatov return udp_pre_connect(sk, uaddr, addr_len); 1056d74bad4eSAndrey Ignatov } 1057d74bad4eSAndrey Ignatov 1058d74bad4eSAndrey Ignatov if (addr_len < SIN6_LEN_RFC2133) 1059d74bad4eSAndrey Ignatov return -EINVAL; 1060d74bad4eSAndrey Ignatov 1061d74bad4eSAndrey Ignatov return BPF_CGROUP_RUN_PROG_INET6_CONNECT_LOCK(sk, uaddr); 1062d74bad4eSAndrey Ignatov } 1063d74bad4eSAndrey Ignatov 1064493c6be3SSridhar Samudrala /** 1065493c6be3SSridhar Samudrala * udp6_hwcsum_outgoing - handle outgoing HW checksumming 1066493c6be3SSridhar Samudrala * @sk: socket we are sending on 1067493c6be3SSridhar Samudrala * @skb: sk_buff containing the filled-in UDP header 1068493c6be3SSridhar Samudrala * (checksum field must be zeroed out) 1069493c6be3SSridhar Samudrala */ 1070493c6be3SSridhar Samudrala static void udp6_hwcsum_outgoing(struct sock *sk, struct sk_buff *skb, 1071493c6be3SSridhar Samudrala const struct in6_addr *saddr, 1072493c6be3SSridhar Samudrala const struct in6_addr *daddr, int len) 1073493c6be3SSridhar Samudrala { 1074493c6be3SSridhar Samudrala unsigned int offset; 1075493c6be3SSridhar Samudrala struct udphdr *uh = udp_hdr(skb); 1076d39d938cSVlad Yasevich struct sk_buff *frags = skb_shinfo(skb)->frag_list; 1077493c6be3SSridhar Samudrala __wsum csum = 0; 1078493c6be3SSridhar Samudrala 1079d39d938cSVlad Yasevich if (!frags) { 1080493c6be3SSridhar Samudrala /* Only one fragment on the socket. */ 1081493c6be3SSridhar Samudrala skb->csum_start = skb_transport_header(skb) - skb->head; 1082493c6be3SSridhar Samudrala skb->csum_offset = offsetof(struct udphdr, check); 1083493c6be3SSridhar Samudrala uh->check = ~csum_ipv6_magic(saddr, daddr, len, IPPROTO_UDP, 0); 1084493c6be3SSridhar Samudrala } else { 1085493c6be3SSridhar Samudrala /* 1086493c6be3SSridhar Samudrala * HW-checksum won't work as there are two or more 1087493c6be3SSridhar Samudrala * fragments on the socket so that all csums of sk_buffs 1088493c6be3SSridhar Samudrala * should be together 1089493c6be3SSridhar Samudrala */ 1090493c6be3SSridhar Samudrala offset = skb_transport_offset(skb); 1091493c6be3SSridhar Samudrala skb->csum = skb_checksum(skb, offset, skb->len - offset, 0); 109263ecc3d9SSubash Abhinov Kasiviswanathan csum = skb->csum; 1093493c6be3SSridhar Samudrala 1094493c6be3SSridhar Samudrala skb->ip_summed = CHECKSUM_NONE; 1095493c6be3SSridhar Samudrala 1096d39d938cSVlad Yasevich do { 1097d39d938cSVlad Yasevich csum = csum_add(csum, frags->csum); 1098d39d938cSVlad Yasevich } while ((frags = frags->next)); 1099493c6be3SSridhar Samudrala 1100493c6be3SSridhar Samudrala uh->check = csum_ipv6_magic(saddr, daddr, len, IPPROTO_UDP, 1101493c6be3SSridhar Samudrala csum); 1102493c6be3SSridhar Samudrala if (uh->check == 0) 1103493c6be3SSridhar Samudrala uh->check = CSUM_MANGLED_0; 1104493c6be3SSridhar Samudrala } 1105493c6be3SSridhar Samudrala } 1106493c6be3SSridhar Samudrala 1107db8dac20SDavid S. Miller /* 1108db8dac20SDavid S. Miller * Sending 1109db8dac20SDavid S. Miller */ 1110db8dac20SDavid S. Miller 1111bec1f6f6SWillem de Bruijn static int udp_v6_send_skb(struct sk_buff *skb, struct flowi6 *fl6, 1112bec1f6f6SWillem de Bruijn struct inet_cork *cork) 1113db8dac20SDavid S. Miller { 1114d39d938cSVlad Yasevich struct sock *sk = skb->sk; 1115db8dac20SDavid S. Miller struct udphdr *uh; 1116db8dac20SDavid S. Miller int err = 0; 1117db8dac20SDavid S. Miller int is_udplite = IS_UDPLITE(sk); 1118db8dac20SDavid S. Miller __wsum csum = 0; 1119d39d938cSVlad Yasevich int offset = skb_transport_offset(skb); 1120d39d938cSVlad Yasevich int len = skb->len - offset; 1121db8dac20SDavid S. Miller 1122db8dac20SDavid S. Miller /* 1123db8dac20SDavid S. Miller * Create a UDP header 1124db8dac20SDavid S. Miller */ 1125db8dac20SDavid S. Miller uh = udp_hdr(skb); 11261958b856SDavid S. Miller uh->source = fl6->fl6_sport; 11271958b856SDavid S. Miller uh->dest = fl6->fl6_dport; 1128d39d938cSVlad Yasevich uh->len = htons(len); 1129db8dac20SDavid S. Miller uh->check = 0; 1130db8dac20SDavid S. Miller 1131bec1f6f6SWillem de Bruijn if (cork->gso_size) { 1132bec1f6f6SWillem de Bruijn const int hlen = skb_network_header_len(skb) + 1133bec1f6f6SWillem de Bruijn sizeof(struct udphdr); 1134bec1f6f6SWillem de Bruijn 1135bec1f6f6SWillem de Bruijn if (hlen + cork->gso_size > cork->fragsize) 1136bec1f6f6SWillem de Bruijn return -EINVAL; 1137bec1f6f6SWillem de Bruijn if (skb->len > cork->gso_size * UDP_MAX_SEGMENTS) 1138bec1f6f6SWillem de Bruijn return -EINVAL; 1139a8c744a8SWillem de Bruijn if (udp_sk(sk)->no_check6_tx) 1140a8c744a8SWillem de Bruijn return -EINVAL; 1141ff06342cSWillem de Bruijn if (skb->ip_summed != CHECKSUM_PARTIAL || is_udplite || 1142ff06342cSWillem de Bruijn dst_xfrm(skb_dst(skb))) 1143bec1f6f6SWillem de Bruijn return -EIO; 1144bec1f6f6SWillem de Bruijn 1145bec1f6f6SWillem de Bruijn skb_shinfo(skb)->gso_size = cork->gso_size; 1146bec1f6f6SWillem de Bruijn skb_shinfo(skb)->gso_type = SKB_GSO_UDP_L4; 1147a8c744a8SWillem de Bruijn goto csum_partial; 1148bec1f6f6SWillem de Bruijn } 1149bec1f6f6SWillem de Bruijn 1150db8dac20SDavid S. Miller if (is_udplite) 1151d39d938cSVlad Yasevich csum = udplite_csum(skb); 1152d39d938cSVlad Yasevich else if (udp_sk(sk)->no_check6_tx) { /* UDP csum disabled */ 11534068579eSTom Herbert skb->ip_summed = CHECKSUM_NONE; 11544068579eSTom Herbert goto send; 11554068579eSTom Herbert } else if (skb->ip_summed == CHECKSUM_PARTIAL) { /* UDP hardware csum */ 1156a8c744a8SWillem de Bruijn csum_partial: 1157d39d938cSVlad Yasevich udp6_hwcsum_outgoing(sk, skb, &fl6->saddr, &fl6->daddr, len); 1158493c6be3SSridhar Samudrala goto send; 1159493c6be3SSridhar Samudrala } else 1160d39d938cSVlad Yasevich csum = udp_csum(skb); 1161db8dac20SDavid S. Miller 1162db8dac20SDavid S. Miller /* add protocol-dependent pseudo-header */ 11634c9483b2SDavid S. Miller uh->check = csum_ipv6_magic(&fl6->saddr, &fl6->daddr, 1164d39d938cSVlad Yasevich len, fl6->flowi6_proto, csum); 1165db8dac20SDavid S. Miller if (uh->check == 0) 1166db8dac20SDavid S. Miller uh->check = CSUM_MANGLED_0; 1167db8dac20SDavid S. Miller 1168493c6be3SSridhar Samudrala send: 1169d39d938cSVlad Yasevich err = ip6_send_skb(skb); 11706ce9e7b5SEric Dumazet if (err) { 11716ce9e7b5SEric Dumazet if (err == -ENOBUFS && !inet6_sk(sk)->recverr) { 11726aef70a8SEric Dumazet UDP6_INC_STATS(sock_net(sk), 11736ce9e7b5SEric Dumazet UDP_MIB_SNDBUFERRORS, is_udplite); 11746ce9e7b5SEric Dumazet err = 0; 11756ce9e7b5SEric Dumazet } 11766aef70a8SEric Dumazet } else { 11776aef70a8SEric Dumazet UDP6_INC_STATS(sock_net(sk), 11786ce9e7b5SEric Dumazet UDP_MIB_OUTDATAGRAMS, is_udplite); 11796aef70a8SEric Dumazet } 1180d39d938cSVlad Yasevich return err; 1181d39d938cSVlad Yasevich } 1182d39d938cSVlad Yasevich 1183d39d938cSVlad Yasevich static int udp_v6_push_pending_frames(struct sock *sk) 1184d39d938cSVlad Yasevich { 1185d39d938cSVlad Yasevich struct sk_buff *skb; 1186d39d938cSVlad Yasevich struct udp_sock *up = udp_sk(sk); 1187d39d938cSVlad Yasevich struct flowi6 fl6; 1188d39d938cSVlad Yasevich int err = 0; 1189d39d938cSVlad Yasevich 1190d39d938cSVlad Yasevich if (up->pending == AF_INET) 1191d39d938cSVlad Yasevich return udp_push_pending_frames(sk); 1192d39d938cSVlad Yasevich 1193d39d938cSVlad Yasevich /* ip6_finish_skb will release the cork, so make a copy of 1194d39d938cSVlad Yasevich * fl6 here. 1195d39d938cSVlad Yasevich */ 1196d39d938cSVlad Yasevich fl6 = inet_sk(sk)->cork.fl.u.ip6; 1197d39d938cSVlad Yasevich 1198d39d938cSVlad Yasevich skb = ip6_finish_skb(sk); 1199d39d938cSVlad Yasevich if (!skb) 1200d39d938cSVlad Yasevich goto out; 1201d39d938cSVlad Yasevich 1202bec1f6f6SWillem de Bruijn err = udp_v6_send_skb(skb, &fl6, &inet_sk(sk)->cork.base); 1203d39d938cSVlad Yasevich 1204db8dac20SDavid S. Miller out: 1205db8dac20SDavid S. Miller up->len = 0; 1206db8dac20SDavid S. Miller up->pending = 0; 1207db8dac20SDavid S. Miller return err; 1208db8dac20SDavid S. Miller } 1209db8dac20SDavid S. Miller 12101b784140SYing Xue int udpv6_sendmsg(struct sock *sk, struct msghdr *msg, size_t len) 1211db8dac20SDavid S. Miller { 1212db8dac20SDavid S. Miller struct ipv6_txoptions opt_space; 1213db8dac20SDavid S. Miller struct udp_sock *up = udp_sk(sk); 1214db8dac20SDavid S. Miller struct inet_sock *inet = inet_sk(sk); 1215db8dac20SDavid S. Miller struct ipv6_pinfo *np = inet6_sk(sk); 1216342dfc30SSteffen Hurrle DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, msg->msg_name); 121720c59de2SArnaud Ebalard struct in6_addr *daddr, *final_p, final; 1218db8dac20SDavid S. Miller struct ipv6_txoptions *opt = NULL; 121945f6fad8SEric Dumazet struct ipv6_txoptions *opt_to_free = NULL; 1220db8dac20SDavid S. Miller struct ip6_flowlabel *flowlabel = NULL; 12214c9483b2SDavid S. Miller struct flowi6 fl6; 1222db8dac20SDavid S. Miller struct dst_entry *dst; 122326879da5SWei Wang struct ipcm6_cookie ipc6; 1224db8dac20SDavid S. Miller int addr_len = msg->msg_namelen; 12259f542f61SAlexey Kodanev bool connected = false; 1226db8dac20SDavid S. Miller int ulen = len; 1227db8dac20SDavid S. Miller int corkreq = up->corkflag || msg->msg_flags&MSG_MORE; 1228db8dac20SDavid S. Miller int err; 1229db8dac20SDavid S. Miller int is_udplite = IS_UDPLITE(sk); 1230db8dac20SDavid S. Miller int (*getfrag)(void *, char *, int, int, int, struct sk_buff *); 1231db8dac20SDavid S. Miller 1232b515430aSWillem de Bruijn ipcm6_init(&ipc6); 1233bec1f6f6SWillem de Bruijn ipc6.gso_size = up->gso_size; 12345fdaa88dSWillem de Bruijn ipc6.sockc.tsflags = sk->sk_tsflags; 123526879da5SWei Wang 1236db8dac20SDavid S. Miller /* destination address check */ 1237db8dac20SDavid S. Miller if (sin6) { 1238db8dac20SDavid S. Miller if (addr_len < offsetof(struct sockaddr, sa_data)) 1239db8dac20SDavid S. Miller return -EINVAL; 1240db8dac20SDavid S. Miller 1241db8dac20SDavid S. Miller switch (sin6->sin6_family) { 1242db8dac20SDavid S. Miller case AF_INET6: 1243db8dac20SDavid S. Miller if (addr_len < SIN6_LEN_RFC2133) 1244db8dac20SDavid S. Miller return -EINVAL; 1245db8dac20SDavid S. Miller daddr = &sin6->sin6_addr; 1246052d2369SJonathan T. Leighton if (ipv6_addr_any(daddr) && 1247052d2369SJonathan T. Leighton ipv6_addr_v4mapped(&np->saddr)) 1248052d2369SJonathan T. Leighton ipv6_addr_set_v4mapped(htonl(INADDR_LOOPBACK), 1249052d2369SJonathan T. Leighton daddr); 1250db8dac20SDavid S. Miller break; 1251db8dac20SDavid S. Miller case AF_INET: 1252db8dac20SDavid S. Miller goto do_udp_sendmsg; 1253db8dac20SDavid S. Miller case AF_UNSPEC: 1254db8dac20SDavid S. Miller msg->msg_name = sin6 = NULL; 1255db8dac20SDavid S. Miller msg->msg_namelen = addr_len = 0; 1256db8dac20SDavid S. Miller daddr = NULL; 1257db8dac20SDavid S. Miller break; 1258db8dac20SDavid S. Miller default: 1259db8dac20SDavid S. Miller return -EINVAL; 1260db8dac20SDavid S. Miller } 1261db8dac20SDavid S. Miller } else if (!up->pending) { 1262db8dac20SDavid S. Miller if (sk->sk_state != TCP_ESTABLISHED) 1263db8dac20SDavid S. Miller return -EDESTADDRREQ; 1264efe4208fSEric Dumazet daddr = &sk->sk_v6_daddr; 1265db8dac20SDavid S. Miller } else 1266db8dac20SDavid S. Miller daddr = NULL; 1267db8dac20SDavid S. Miller 1268db8dac20SDavid S. Miller if (daddr) { 1269db8dac20SDavid S. Miller if (ipv6_addr_v4mapped(daddr)) { 1270db8dac20SDavid S. Miller struct sockaddr_in sin; 1271db8dac20SDavid S. Miller sin.sin_family = AF_INET; 1272c720c7e8SEric Dumazet sin.sin_port = sin6 ? sin6->sin6_port : inet->inet_dport; 1273db8dac20SDavid S. Miller sin.sin_addr.s_addr = daddr->s6_addr32[3]; 1274db8dac20SDavid S. Miller msg->msg_name = &sin; 1275db8dac20SDavid S. Miller msg->msg_namelen = sizeof(sin); 1276db8dac20SDavid S. Miller do_udp_sendmsg: 1277db8dac20SDavid S. Miller if (__ipv6_only_sock(sk)) 1278db8dac20SDavid S. Miller return -ENETUNREACH; 12791b784140SYing Xue return udp_sendmsg(sk, msg, len); 1280db8dac20SDavid S. Miller } 1281db8dac20SDavid S. Miller } 1282db8dac20SDavid S. Miller 1283db8dac20SDavid S. Miller if (up->pending == AF_INET) 12841b784140SYing Xue return udp_sendmsg(sk, msg, len); 1285db8dac20SDavid S. Miller 1286db8dac20SDavid S. Miller /* Rough check on arithmetic overflow, 1287db8dac20SDavid S. Miller better check is made in ip6_append_data(). 1288db8dac20SDavid S. Miller */ 1289db8dac20SDavid S. Miller if (len > INT_MAX - sizeof(struct udphdr)) 1290db8dac20SDavid S. Miller return -EMSGSIZE; 1291db8dac20SDavid S. Miller 129203485f2aSVlad Yasevich getfrag = is_udplite ? udplite_getfrag : ip_generic_getfrag; 1293db8dac20SDavid S. Miller if (up->pending) { 1294db8dac20SDavid S. Miller /* 1295db8dac20SDavid S. Miller * There are pending frames. 1296db8dac20SDavid S. Miller * The socket lock must be held while it's corked. 1297db8dac20SDavid S. Miller */ 1298db8dac20SDavid S. Miller lock_sock(sk); 1299db8dac20SDavid S. Miller if (likely(up->pending)) { 1300db8dac20SDavid S. Miller if (unlikely(up->pending != AF_INET6)) { 1301db8dac20SDavid S. Miller release_sock(sk); 1302db8dac20SDavid S. Miller return -EAFNOSUPPORT; 1303db8dac20SDavid S. Miller } 1304db8dac20SDavid S. Miller dst = NULL; 1305db8dac20SDavid S. Miller goto do_append_data; 1306db8dac20SDavid S. Miller } 1307db8dac20SDavid S. Miller release_sock(sk); 1308db8dac20SDavid S. Miller } 1309db8dac20SDavid S. Miller ulen += sizeof(struct udphdr); 1310db8dac20SDavid S. Miller 13114c9483b2SDavid S. Miller memset(&fl6, 0, sizeof(fl6)); 1312db8dac20SDavid S. Miller 1313db8dac20SDavid S. Miller if (sin6) { 1314db8dac20SDavid S. Miller if (sin6->sin6_port == 0) 1315db8dac20SDavid S. Miller return -EINVAL; 1316db8dac20SDavid S. Miller 13171958b856SDavid S. Miller fl6.fl6_dport = sin6->sin6_port; 1318db8dac20SDavid S. Miller daddr = &sin6->sin6_addr; 1319db8dac20SDavid S. Miller 1320db8dac20SDavid S. Miller if (np->sndflow) { 13214c9483b2SDavid S. Miller fl6.flowlabel = sin6->sin6_flowinfo&IPV6_FLOWINFO_MASK; 13224c9483b2SDavid S. Miller if (fl6.flowlabel&IPV6_FLOWLABEL_MASK) { 13234c9483b2SDavid S. Miller flowlabel = fl6_sock_lookup(sk, fl6.flowlabel); 132463159f29SIan Morris if (!flowlabel) 1325db8dac20SDavid S. Miller return -EINVAL; 1326db8dac20SDavid S. Miller } 1327db8dac20SDavid S. Miller } 1328db8dac20SDavid S. Miller 1329db8dac20SDavid S. Miller /* 1330db8dac20SDavid S. Miller * Otherwise it will be difficult to maintain 1331db8dac20SDavid S. Miller * sk->sk_dst_cache. 1332db8dac20SDavid S. Miller */ 1333db8dac20SDavid S. Miller if (sk->sk_state == TCP_ESTABLISHED && 1334efe4208fSEric Dumazet ipv6_addr_equal(daddr, &sk->sk_v6_daddr)) 1335efe4208fSEric Dumazet daddr = &sk->sk_v6_daddr; 1336db8dac20SDavid S. Miller 1337db8dac20SDavid S. Miller if (addr_len >= sizeof(struct sockaddr_in6) && 1338db8dac20SDavid S. Miller sin6->sin6_scope_id && 1339842df073SHannes Frederic Sowa __ipv6_addr_needs_scope_id(__ipv6_addr_type(daddr))) 13404c9483b2SDavid S. Miller fl6.flowi6_oif = sin6->sin6_scope_id; 1341db8dac20SDavid S. Miller } else { 1342db8dac20SDavid S. Miller if (sk->sk_state != TCP_ESTABLISHED) 1343db8dac20SDavid S. Miller return -EDESTADDRREQ; 1344db8dac20SDavid S. Miller 13451958b856SDavid S. Miller fl6.fl6_dport = inet->inet_dport; 1346efe4208fSEric Dumazet daddr = &sk->sk_v6_daddr; 13474c9483b2SDavid S. Miller fl6.flowlabel = np->flow_label; 13489f542f61SAlexey Kodanev connected = true; 1349db8dac20SDavid S. Miller } 1350db8dac20SDavid S. Miller 13514c9483b2SDavid S. Miller if (!fl6.flowi6_oif) 13524c9483b2SDavid S. Miller fl6.flowi6_oif = sk->sk_bound_dev_if; 1353db8dac20SDavid S. Miller 13544c9483b2SDavid S. Miller if (!fl6.flowi6_oif) 13554c9483b2SDavid S. Miller fl6.flowi6_oif = np->sticky_pktinfo.ipi6_ifindex; 13569f690db7SYang Hongyang 13574c9483b2SDavid S. Miller fl6.flowi6_mark = sk->sk_mark; 1358e2d118a1SLorenzo Colitti fl6.flowi6_uid = sk->sk_uid; 135951953d5bSBrian Haley 1360db8dac20SDavid S. Miller if (msg->msg_controllen) { 1361db8dac20SDavid S. Miller opt = &opt_space; 1362db8dac20SDavid S. Miller memset(opt, 0, sizeof(struct ipv6_txoptions)); 1363db8dac20SDavid S. Miller opt->tot_len = sizeof(*opt); 136426879da5SWei Wang ipc6.opt = opt; 1365db8dac20SDavid S. Miller 13662e8de857SWillem de Bruijn err = udp_cmsg_send(sk, msg, &ipc6.gso_size); 13672e8de857SWillem de Bruijn if (err > 0) 13682e8de857SWillem de Bruijn err = ip6_datagram_send_ctl(sock_net(sk), sk, msg, &fl6, 13695fdaa88dSWillem de Bruijn &ipc6); 1370db8dac20SDavid S. Miller if (err < 0) { 1371db8dac20SDavid S. Miller fl6_sock_release(flowlabel); 1372db8dac20SDavid S. Miller return err; 1373db8dac20SDavid S. Miller } 13744c9483b2SDavid S. Miller if ((fl6.flowlabel&IPV6_FLOWLABEL_MASK) && !flowlabel) { 13754c9483b2SDavid S. Miller flowlabel = fl6_sock_lookup(sk, fl6.flowlabel); 137663159f29SIan Morris if (!flowlabel) 1377db8dac20SDavid S. Miller return -EINVAL; 1378db8dac20SDavid S. Miller } 1379db8dac20SDavid S. Miller if (!(opt->opt_nflen|opt->opt_flen)) 1380db8dac20SDavid S. Miller opt = NULL; 13819f542f61SAlexey Kodanev connected = false; 1382db8dac20SDavid S. Miller } 138345f6fad8SEric Dumazet if (!opt) { 138445f6fad8SEric Dumazet opt = txopt_get(np); 138545f6fad8SEric Dumazet opt_to_free = opt; 138645f6fad8SEric Dumazet } 1387db8dac20SDavid S. Miller if (flowlabel) 1388db8dac20SDavid S. Miller opt = fl6_merge_options(&opt_space, flowlabel, opt); 1389db8dac20SDavid S. Miller opt = ipv6_fixup_options(&opt_space, opt); 139026879da5SWei Wang ipc6.opt = opt; 1391db8dac20SDavid S. Miller 13924c9483b2SDavid S. Miller fl6.flowi6_proto = sk->sk_protocol; 13934e3fd7a0SAlexey Dobriyan fl6.daddr = *daddr; 13944c9483b2SDavid S. Miller if (ipv6_addr_any(&fl6.saddr) && !ipv6_addr_any(&np->saddr)) 13954e3fd7a0SAlexey Dobriyan fl6.saddr = np->saddr; 13961958b856SDavid S. Miller fl6.fl6_sport = inet->inet_sport; 1397db8dac20SDavid S. Miller 13981cedee13SAndrey Ignatov if (cgroup_bpf_enabled && !connected) { 13991cedee13SAndrey Ignatov err = BPF_CGROUP_RUN_PROG_UDP6_SENDMSG_LOCK(sk, 14001cedee13SAndrey Ignatov (struct sockaddr *)sin6, &fl6.saddr); 14011cedee13SAndrey Ignatov if (err) 14021cedee13SAndrey Ignatov goto out_no_dst; 14031cedee13SAndrey Ignatov if (sin6) { 14041cedee13SAndrey Ignatov if (ipv6_addr_v4mapped(&sin6->sin6_addr)) { 14051cedee13SAndrey Ignatov /* BPF program rewrote IPv6-only by IPv4-mapped 14061cedee13SAndrey Ignatov * IPv6. It's currently unsupported. 14071cedee13SAndrey Ignatov */ 14081cedee13SAndrey Ignatov err = -ENOTSUPP; 14091cedee13SAndrey Ignatov goto out_no_dst; 14101cedee13SAndrey Ignatov } 14111cedee13SAndrey Ignatov if (sin6->sin6_port == 0) { 14121cedee13SAndrey Ignatov /* BPF program set invalid port. Reject it. */ 14131cedee13SAndrey Ignatov err = -EINVAL; 14141cedee13SAndrey Ignatov goto out_no_dst; 14151cedee13SAndrey Ignatov } 14161cedee13SAndrey Ignatov fl6.fl6_dport = sin6->sin6_port; 14171cedee13SAndrey Ignatov fl6.daddr = sin6->sin6_addr; 14181cedee13SAndrey Ignatov } 14191cedee13SAndrey Ignatov } 14201cedee13SAndrey Ignatov 1421e8e36984SAndrey Ignatov if (ipv6_addr_any(&fl6.daddr)) 1422e8e36984SAndrey Ignatov fl6.daddr.s6_addr[15] = 0x1; /* :: means loopback (BSD'ism) */ 1423e8e36984SAndrey Ignatov 14244c9483b2SDavid S. Miller final_p = fl6_update_dst(&fl6, opt, &final); 142520c59de2SArnaud Ebalard if (final_p) 14269f542f61SAlexey Kodanev connected = false; 1427db8dac20SDavid S. Miller 14284c9483b2SDavid S. Miller if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr)) { 14294c9483b2SDavid S. Miller fl6.flowi6_oif = np->mcast_oif; 14309f542f61SAlexey Kodanev connected = false; 1431c4062dfcSErich E. Hoover } else if (!fl6.flowi6_oif) 1432c4062dfcSErich E. Hoover fl6.flowi6_oif = np->ucast_oif; 1433db8dac20SDavid S. Miller 14344c9483b2SDavid S. Miller security_sk_classify_flow(sk, flowi6_to_flowi(&fl6)); 1435db8dac20SDavid S. Miller 143638b7097bSHannes Frederic Sowa if (ipc6.tclass < 0) 143738b7097bSHannes Frederic Sowa ipc6.tclass = np->tclass; 143838b7097bSHannes Frederic Sowa 143938b7097bSHannes Frederic Sowa fl6.flowlabel = ip6_make_flowinfo(ipc6.tclass, fl6.flowlabel); 144038b7097bSHannes Frederic Sowa 14414f858c56SAlexey Kodanev dst = ip6_sk_dst_lookup_flow(sk, &fl6, final_p, connected); 144268d0c6d3SDavid S. Miller if (IS_ERR(dst)) { 144368d0c6d3SDavid S. Miller err = PTR_ERR(dst); 144468d0c6d3SDavid S. Miller dst = NULL; 1445db8dac20SDavid S. Miller goto out; 1446db8dac20SDavid S. Miller } 1447db8dac20SDavid S. Miller 144826879da5SWei Wang if (ipc6.hlimit < 0) 144926879da5SWei Wang ipc6.hlimit = ip6_sk_dst_hoplimit(np, &fl6, dst); 1450db8dac20SDavid S. Miller 1451db8dac20SDavid S. Miller if (msg->msg_flags&MSG_CONFIRM) 1452db8dac20SDavid S. Miller goto do_confirm; 1453db8dac20SDavid S. Miller back_from_confirm: 1454db8dac20SDavid S. Miller 145503485f2aSVlad Yasevich /* Lockless fast path for the non-corking case */ 145603485f2aSVlad Yasevich if (!corkreq) { 14571cd7884dSWillem de Bruijn struct inet_cork_full cork; 145803485f2aSVlad Yasevich struct sk_buff *skb; 145903485f2aSVlad Yasevich 146003485f2aSVlad Yasevich skb = ip6_make_skb(sk, getfrag, msg, ulen, 146126879da5SWei Wang sizeof(struct udphdr), &ipc6, 146203485f2aSVlad Yasevich &fl6, (struct rt6_info *)dst, 14635fdaa88dSWillem de Bruijn msg->msg_flags, &cork); 146403485f2aSVlad Yasevich err = PTR_ERR(skb); 146503485f2aSVlad Yasevich if (!IS_ERR_OR_NULL(skb)) 1466bec1f6f6SWillem de Bruijn err = udp_v6_send_skb(skb, &fl6, &cork.base); 14674f858c56SAlexey Kodanev goto out; 146803485f2aSVlad Yasevich } 146903485f2aSVlad Yasevich 1470db8dac20SDavid S. Miller lock_sock(sk); 1471db8dac20SDavid S. Miller if (unlikely(up->pending)) { 1472db8dac20SDavid S. Miller /* The socket is already corked while preparing it. */ 1473db8dac20SDavid S. Miller /* ... which is an evident application bug. --ANK */ 1474db8dac20SDavid S. Miller release_sock(sk); 1475db8dac20SDavid S. Miller 1476ba7a46f1SJoe Perches net_dbg_ratelimited("udp cork app bug 2\n"); 1477db8dac20SDavid S. Miller err = -EINVAL; 1478db8dac20SDavid S. Miller goto out; 1479db8dac20SDavid S. Miller } 1480db8dac20SDavid S. Miller 1481db8dac20SDavid S. Miller up->pending = AF_INET6; 1482db8dac20SDavid S. Miller 1483db8dac20SDavid S. Miller do_append_data: 148426879da5SWei Wang if (ipc6.dontfrag < 0) 148526879da5SWei Wang ipc6.dontfrag = np->dontfrag; 1486db8dac20SDavid S. Miller up->len += ulen; 148726879da5SWei Wang err = ip6_append_data(sk, getfrag, msg, ulen, sizeof(struct udphdr), 148826879da5SWei Wang &ipc6, &fl6, (struct rt6_info *)dst, 14895fdaa88dSWillem de Bruijn corkreq ? msg->msg_flags|MSG_MORE : msg->msg_flags); 1490db8dac20SDavid S. Miller if (err) 1491db8dac20SDavid S. Miller udp_v6_flush_pending_frames(sk); 1492db8dac20SDavid S. Miller else if (!corkreq) 1493db8dac20SDavid S. Miller err = udp_v6_push_pending_frames(sk); 1494db8dac20SDavid S. Miller else if (unlikely(skb_queue_empty(&sk->sk_write_queue))) 1495db8dac20SDavid S. Miller up->pending = 0; 1496db8dac20SDavid S. Miller 149703485f2aSVlad Yasevich if (err > 0) 149803485f2aSVlad Yasevich err = np->recverr ? net_xmit_errno(err) : 0; 149903485f2aSVlad Yasevich release_sock(sk); 150003485f2aSVlad Yasevich 1501db8dac20SDavid S. Miller out: 1502a3c96089SYOSHIFUJI Hideaki dst_release(dst); 15031cedee13SAndrey Ignatov out_no_dst: 1504db8dac20SDavid S. Miller fl6_sock_release(flowlabel); 150545f6fad8SEric Dumazet txopt_put(opt_to_free); 1506db8dac20SDavid S. Miller if (!err) 1507db8dac20SDavid S. Miller return len; 1508db8dac20SDavid S. Miller /* 1509db8dac20SDavid S. Miller * ENOBUFS = no kernel mem, SOCK_NOSPACE = no sndbuf space. Reporting 1510db8dac20SDavid S. Miller * ENOBUFS might not be good (it's not tunable per se), but otherwise 1511db8dac20SDavid S. Miller * we don't have a good statistic (IpOutDiscards but it can be too many 1512db8dac20SDavid S. Miller * things). We could add another new stat but at least for now that 1513db8dac20SDavid S. Miller * seems like overkill. 1514db8dac20SDavid S. Miller */ 1515db8dac20SDavid S. Miller if (err == -ENOBUFS || test_bit(SOCK_NOSPACE, &sk->sk_socket->flags)) { 15166aef70a8SEric Dumazet UDP6_INC_STATS(sock_net(sk), 1517235b9f7aSPavel Emelyanov UDP_MIB_SNDBUFERRORS, is_udplite); 1518db8dac20SDavid S. Miller } 1519db8dac20SDavid S. Miller return err; 1520db8dac20SDavid S. Miller 1521db8dac20SDavid S. Miller do_confirm: 15220dec879fSJulian Anastasov if (msg->msg_flags & MSG_PROBE) 15230dec879fSJulian Anastasov dst_confirm_neigh(dst, &fl6.daddr); 1524db8dac20SDavid S. Miller if (!(msg->msg_flags&MSG_PROBE) || len) 1525db8dac20SDavid S. Miller goto back_from_confirm; 1526db8dac20SDavid S. Miller err = 0; 1527db8dac20SDavid S. Miller goto out; 1528db8dac20SDavid S. Miller } 1529db8dac20SDavid S. Miller 15307d06b2e0SBrian Haley void udpv6_destroy_sock(struct sock *sk) 1531db8dac20SDavid S. Miller { 153244046a59STom Parkin struct udp_sock *up = udp_sk(sk); 1533db8dac20SDavid S. Miller lock_sock(sk); 1534db8dac20SDavid S. Miller udp_v6_flush_pending_frames(sk); 1535db8dac20SDavid S. Miller release_sock(sk); 1536db8dac20SDavid S. Miller 153760fb9567SPaolo Abeni if (static_branch_unlikely(&udpv6_encap_needed_key)) { 153860fb9567SPaolo Abeni if (up->encap_type) { 153944046a59STom Parkin void (*encap_destroy)(struct sock *sk); 15406aa7de05SMark Rutland encap_destroy = READ_ONCE(up->encap_destroy); 154144046a59STom Parkin if (encap_destroy) 154244046a59STom Parkin encap_destroy(sk); 154344046a59STom Parkin } 154460fb9567SPaolo Abeni if (up->encap_enabled) 15459c480601SPaolo Abeni static_branch_dec(&udpv6_encap_needed_key); 154660fb9567SPaolo Abeni } 154744046a59STom Parkin 1548db8dac20SDavid S. Miller inet6_destroy_sock(sk); 1549db8dac20SDavid S. Miller } 1550db8dac20SDavid S. Miller 1551db8dac20SDavid S. Miller /* 1552db8dac20SDavid S. Miller * Socket option code for UDP 1553db8dac20SDavid S. Miller */ 1554db8dac20SDavid S. Miller int udpv6_setsockopt(struct sock *sk, int level, int optname, 1555b7058842SDavid S. Miller char __user *optval, unsigned int optlen) 1556db8dac20SDavid S. Miller { 1557db8dac20SDavid S. Miller if (level == SOL_UDP || level == SOL_UDPLITE) 1558db8dac20SDavid S. Miller return udp_lib_setsockopt(sk, level, optname, optval, optlen, 1559db8dac20SDavid S. Miller udp_v6_push_pending_frames); 1560db8dac20SDavid S. Miller return ipv6_setsockopt(sk, level, optname, optval, optlen); 1561db8dac20SDavid S. Miller } 1562db8dac20SDavid S. Miller 1563db8dac20SDavid S. Miller #ifdef CONFIG_COMPAT 1564db8dac20SDavid S. Miller int compat_udpv6_setsockopt(struct sock *sk, int level, int optname, 1565b7058842SDavid S. Miller char __user *optval, unsigned int optlen) 1566db8dac20SDavid S. Miller { 1567db8dac20SDavid S. Miller if (level == SOL_UDP || level == SOL_UDPLITE) 1568db8dac20SDavid S. Miller return udp_lib_setsockopt(sk, level, optname, optval, optlen, 1569db8dac20SDavid S. Miller udp_v6_push_pending_frames); 1570db8dac20SDavid S. Miller return compat_ipv6_setsockopt(sk, level, optname, optval, optlen); 1571db8dac20SDavid S. Miller } 1572db8dac20SDavid S. Miller #endif 1573db8dac20SDavid S. Miller 1574db8dac20SDavid S. Miller int udpv6_getsockopt(struct sock *sk, int level, int optname, 1575db8dac20SDavid S. Miller char __user *optval, int __user *optlen) 1576db8dac20SDavid S. Miller { 1577db8dac20SDavid S. Miller if (level == SOL_UDP || level == SOL_UDPLITE) 1578db8dac20SDavid S. Miller return udp_lib_getsockopt(sk, level, optname, optval, optlen); 1579db8dac20SDavid S. Miller return ipv6_getsockopt(sk, level, optname, optval, optlen); 1580db8dac20SDavid S. Miller } 1581db8dac20SDavid S. Miller 1582db8dac20SDavid S. Miller #ifdef CONFIG_COMPAT 1583db8dac20SDavid S. Miller int compat_udpv6_getsockopt(struct sock *sk, int level, int optname, 1584db8dac20SDavid S. Miller char __user *optval, int __user *optlen) 1585db8dac20SDavid S. Miller { 1586db8dac20SDavid S. Miller if (level == SOL_UDP || level == SOL_UDPLITE) 1587db8dac20SDavid S. Miller return udp_lib_getsockopt(sk, level, optname, optval, optlen); 1588db8dac20SDavid S. Miller return compat_ipv6_getsockopt(sk, level, optname, optval, optlen); 1589db8dac20SDavid S. Miller } 1590db8dac20SDavid S. Miller #endif 1591db8dac20SDavid S. Miller 1592a8e3bb34SDavid Ahern /* thinking of making this const? Don't. 1593a8e3bb34SDavid Ahern * early_demux can change based on sysctl. 1594a8e3bb34SDavid Ahern */ 1595dddb64bcSsubashab@codeaurora.org static struct inet6_protocol udpv6_protocol = { 15965425077dSsubashab@codeaurora.org .early_demux = udp_v6_early_demux, 1597dddb64bcSsubashab@codeaurora.org .early_demux_handler = udp_v6_early_demux, 1598db8dac20SDavid S. Miller .handler = udpv6_rcv, 1599db8dac20SDavid S. Miller .err_handler = udpv6_err, 1600db8dac20SDavid S. Miller .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL, 1601db8dac20SDavid S. Miller }; 1602db8dac20SDavid S. Miller 1603db8dac20SDavid S. Miller /* ------------------------------------------------------------------------ */ 1604db8dac20SDavid S. Miller #ifdef CONFIG_PROC_FS 1605db8dac20SDavid S. Miller int udp6_seq_show(struct seq_file *seq, void *v) 1606db8dac20SDavid S. Miller { 160717ef66afSLorenzo Colitti if (v == SEQ_START_TOKEN) { 160817ef66afSLorenzo Colitti seq_puts(seq, IPV6_SEQ_DGRAM_HEADER); 160917ef66afSLorenzo Colitti } else { 161017ef66afSLorenzo Colitti int bucket = ((struct udp_iter_state *)seq->private)->bucket; 161117ef66afSLorenzo Colitti struct inet_sock *inet = inet_sk(v); 161217ef66afSLorenzo Colitti __u16 srcp = ntohs(inet->inet_sport); 161317ef66afSLorenzo Colitti __u16 destp = ntohs(inet->inet_dport); 16146c206b20SPaolo Abeni __ip6_dgram_sock_seq_show(seq, v, srcp, destp, 16156c206b20SPaolo Abeni udp_rqueue_get(v), bucket); 161617ef66afSLorenzo Colitti } 1617db8dac20SDavid S. Miller return 0; 1618db8dac20SDavid S. Miller } 1619db8dac20SDavid S. Miller 1620c3506372SChristoph Hellwig const struct seq_operations udp6_seq_ops = { 1621a3d2599bSChristoph Hellwig .start = udp_seq_start, 1622a3d2599bSChristoph Hellwig .next = udp_seq_next, 1623a3d2599bSChristoph Hellwig .stop = udp_seq_stop, 1624a3d2599bSChristoph Hellwig .show = udp6_seq_show, 1625a3d2599bSChristoph Hellwig }; 1626c3506372SChristoph Hellwig EXPORT_SYMBOL(udp6_seq_ops); 162773cb88ecSArjan van de Ven 1628db8dac20SDavid S. Miller static struct udp_seq_afinfo udp6_seq_afinfo = { 1629db8dac20SDavid S. Miller .family = AF_INET6, 1630645ca708SEric Dumazet .udp_table = &udp_table, 1631db8dac20SDavid S. Miller }; 1632db8dac20SDavid S. Miller 16332c8c1e72SAlexey Dobriyan int __net_init udp6_proc_init(struct net *net) 1634db8dac20SDavid S. Miller { 1635c3506372SChristoph Hellwig if (!proc_create_net_data("udp6", 0444, net->proc_net, &udp6_seq_ops, 1636c3506372SChristoph Hellwig sizeof(struct udp_iter_state), &udp6_seq_afinfo)) 1637a3d2599bSChristoph Hellwig return -ENOMEM; 1638a3d2599bSChristoph Hellwig return 0; 1639db8dac20SDavid S. Miller } 1640db8dac20SDavid S. Miller 1641ec120da6SIan Morris void udp6_proc_exit(struct net *net) 1642ec120da6SIan Morris { 1643a3d2599bSChristoph Hellwig remove_proc_entry("udp6", net->proc_net); 1644db8dac20SDavid S. Miller } 1645db8dac20SDavid S. Miller #endif /* CONFIG_PROC_FS */ 1646db8dac20SDavid S. Miller 1647db8dac20SDavid S. Miller /* ------------------------------------------------------------------------ */ 1648db8dac20SDavid S. Miller 1649db8dac20SDavid S. Miller struct proto udpv6_prot = { 1650db8dac20SDavid S. Miller .name = "UDPv6", 1651db8dac20SDavid S. Miller .owner = THIS_MODULE, 1652db8dac20SDavid S. Miller .close = udp_lib_close, 1653d74bad4eSAndrey Ignatov .pre_connect = udpv6_pre_connect, 1654db8dac20SDavid S. Miller .connect = ip6_datagram_connect, 1655db8dac20SDavid S. Miller .disconnect = udp_disconnect, 1656db8dac20SDavid S. Miller .ioctl = udp_ioctl, 1657850cbaddSPaolo Abeni .init = udp_init_sock, 1658db8dac20SDavid S. Miller .destroy = udpv6_destroy_sock, 1659db8dac20SDavid S. Miller .setsockopt = udpv6_setsockopt, 1660db8dac20SDavid S. Miller .getsockopt = udpv6_getsockopt, 1661db8dac20SDavid S. Miller .sendmsg = udpv6_sendmsg, 1662db8dac20SDavid S. Miller .recvmsg = udpv6_recvmsg, 1663e646b657SMartin KaFai Lau .release_cb = ip6_datagram_release_cb, 1664db8dac20SDavid S. Miller .hash = udp_lib_hash, 1665db8dac20SDavid S. Miller .unhash = udp_lib_unhash, 1666719f8358SEric Dumazet .rehash = udp_v6_rehash, 1667db8dac20SDavid S. Miller .get_port = udp_v6_get_port, 1668db8dac20SDavid S. Miller .memory_allocated = &udp_memory_allocated, 1669db8dac20SDavid S. Miller .sysctl_mem = sysctl_udp_mem, 16701e802951STonghao Zhang .sysctl_wmem_offset = offsetof(struct net, ipv4.sysctl_udp_wmem_min), 16711e802951STonghao Zhang .sysctl_rmem_offset = offsetof(struct net, ipv4.sysctl_udp_rmem_min), 1672db8dac20SDavid S. Miller .obj_size = sizeof(struct udp6_sock), 1673645ca708SEric Dumazet .h.udp_table = &udp_table, 1674db8dac20SDavid S. Miller #ifdef CONFIG_COMPAT 1675db8dac20SDavid S. Miller .compat_setsockopt = compat_udpv6_setsockopt, 1676db8dac20SDavid S. Miller .compat_getsockopt = compat_udpv6_getsockopt, 1677db8dac20SDavid S. Miller #endif 16785d77dca8SDavid Ahern .diag_destroy = udp_abort, 1679db8dac20SDavid S. Miller }; 1680db8dac20SDavid S. Miller 1681db8dac20SDavid S. Miller static struct inet_protosw udpv6_protosw = { 1682db8dac20SDavid S. Miller .type = SOCK_DGRAM, 1683db8dac20SDavid S. Miller .protocol = IPPROTO_UDP, 1684db8dac20SDavid S. Miller .prot = &udpv6_prot, 1685db8dac20SDavid S. Miller .ops = &inet6_dgram_ops, 1686db8dac20SDavid S. Miller .flags = INET_PROTOSW_PERMANENT, 1687db8dac20SDavid S. Miller }; 1688db8dac20SDavid S. Miller 1689db8dac20SDavid S. Miller int __init udpv6_init(void) 1690db8dac20SDavid S. Miller { 1691db8dac20SDavid S. Miller int ret; 1692db8dac20SDavid S. Miller 16933336288aSVlad Yasevich ret = inet6_add_protocol(&udpv6_protocol, IPPROTO_UDP); 16943336288aSVlad Yasevich if (ret) 1695c6b641a4SVlad Yasevich goto out; 16963336288aSVlad Yasevich 1697db8dac20SDavid S. Miller ret = inet6_register_protosw(&udpv6_protosw); 1698db8dac20SDavid S. Miller if (ret) 1699db8dac20SDavid S. Miller goto out_udpv6_protocol; 1700db8dac20SDavid S. Miller out: 1701db8dac20SDavid S. Miller return ret; 1702db8dac20SDavid S. Miller 1703db8dac20SDavid S. Miller out_udpv6_protocol: 1704db8dac20SDavid S. Miller inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP); 1705db8dac20SDavid S. Miller goto out; 1706db8dac20SDavid S. Miller } 1707db8dac20SDavid S. Miller 1708db8dac20SDavid S. Miller void udpv6_exit(void) 1709db8dac20SDavid S. Miller { 1710db8dac20SDavid S. Miller inet6_unregister_protosw(&udpv6_protosw); 1711db8dac20SDavid S. Miller inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP); 1712db8dac20SDavid S. Miller } 1713