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> 390e219ae4SPaolo Abeni #include <linux/indirect_call_wrapper.h> 40db8dac20SDavid S. Miller 41496611d7SCraig Gallek #include <net/addrconf.h> 42db8dac20SDavid S. Miller #include <net/ndisc.h> 43db8dac20SDavid S. Miller #include <net/protocol.h> 44db8dac20SDavid S. Miller #include <net/transp_v6.h> 45db8dac20SDavid S. Miller #include <net/ip6_route.h> 46db8dac20SDavid S. Miller #include <net/raw.h> 47db8dac20SDavid S. Miller #include <net/tcp_states.h> 48db8dac20SDavid S. Miller #include <net/ip6_checksum.h> 49e7cc0824SStefano Brivio #include <net/ip6_tunnel.h> 50db8dac20SDavid S. Miller #include <net/xfrm.h> 510bd84065Ssubashab@codeaurora.org #include <net/inet_hashtables.h> 5272289b96STom Herbert #include <net/inet6_hashtables.h> 53076bb0c8SEliezer Tamir #include <net/busy_poll.h> 54e32ea7e7SCraig Gallek #include <net/sock_reuseport.h> 55db8dac20SDavid S. Miller 56db8dac20SDavid S. Miller #include <linux/proc_fs.h> 57db8dac20SDavid S. Miller #include <linux/seq_file.h> 5822911fc5SEric Dumazet #include <trace/events/skb.h> 59db8dac20SDavid S. Miller #include "udp_impl.h" 60db8dac20SDavid S. Miller 6163a6fff3SRobert Shearman static bool udp6_lib_exact_dif_match(struct net *net, struct sk_buff *skb) 6263a6fff3SRobert Shearman { 6363a6fff3SRobert Shearman #if defined(CONFIG_NET_L3_MASTER_DEV) 6463a6fff3SRobert Shearman if (!net->ipv4.sysctl_udp_l3mdev_accept && 6563a6fff3SRobert Shearman skb && ipv6_l3mdev_skb(IP6CB(skb)->flags)) 6663a6fff3SRobert Shearman return true; 6763a6fff3SRobert Shearman #endif 6863a6fff3SRobert Shearman return false; 6963a6fff3SRobert Shearman } 7063a6fff3SRobert Shearman 716eada011SEric Dumazet static u32 udp6_ehashfn(const struct net *net, 72b50026b5SHannes Frederic Sowa const struct in6_addr *laddr, 73b50026b5SHannes Frederic Sowa const u16 lport, 74b50026b5SHannes Frederic Sowa const struct in6_addr *faddr, 75b50026b5SHannes Frederic Sowa const __be16 fport) 76b50026b5SHannes Frederic Sowa { 771bbdceefSHannes Frederic Sowa static u32 udp6_ehash_secret __read_mostly; 781bbdceefSHannes Frederic Sowa static u32 udp_ipv6_hash_secret __read_mostly; 791bbdceefSHannes Frederic Sowa 801bbdceefSHannes Frederic Sowa u32 lhash, fhash; 811bbdceefSHannes Frederic Sowa 821bbdceefSHannes Frederic Sowa net_get_random_once(&udp6_ehash_secret, 831bbdceefSHannes Frederic Sowa sizeof(udp6_ehash_secret)); 841bbdceefSHannes Frederic Sowa net_get_random_once(&udp_ipv6_hash_secret, 851bbdceefSHannes Frederic Sowa sizeof(udp_ipv6_hash_secret)); 861bbdceefSHannes Frederic Sowa 871bbdceefSHannes Frederic Sowa lhash = (__force u32)laddr->s6_addr32[3]; 881bbdceefSHannes Frederic Sowa fhash = __ipv6_addr_jhash(faddr, udp_ipv6_hash_secret); 891bbdceefSHannes Frederic Sowa 90b50026b5SHannes Frederic Sowa return __inet6_ehashfn(lhash, lport, fhash, fport, 911bbdceefSHannes Frederic Sowa udp_ipv6_hash_secret + net_hash_mix(net)); 92b50026b5SHannes Frederic Sowa } 93b50026b5SHannes Frederic Sowa 946ba5a3c5SPavel Emelyanov int udp_v6_get_port(struct sock *sk, unsigned short snum) 95db8dac20SDavid S. Miller { 9630fff923SEric Dumazet unsigned int hash2_nulladdr = 97f0b1e64cSMartin KaFai Lau ipv6_portaddr_hash(sock_net(sk), &in6addr_any, snum); 9830fff923SEric Dumazet unsigned int hash2_partial = 99f0b1e64cSMartin KaFai Lau ipv6_portaddr_hash(sock_net(sk), &sk->sk_v6_rcv_saddr, 0); 10030fff923SEric Dumazet 101d4cada4aSEric Dumazet /* precompute partial secondary hash */ 10230fff923SEric Dumazet udp_sk(sk)->udp_portaddr_hash = hash2_partial; 103fe38d2a1SJosef Bacik return udp_lib_get_port(sk, snum, hash2_nulladdr); 104db8dac20SDavid S. Miller } 105db8dac20SDavid S. Miller 106f7c46156SAlexey Kodanev void udp_v6_rehash(struct sock *sk) 107719f8358SEric Dumazet { 108f0b1e64cSMartin KaFai Lau u16 new_hash = ipv6_portaddr_hash(sock_net(sk), 109efe4208fSEric Dumazet &sk->sk_v6_rcv_saddr, 110719f8358SEric Dumazet inet_sk(sk)->inet_num); 111719f8358SEric Dumazet 112719f8358SEric Dumazet udp_lib_rehash(sk, new_hash); 113719f8358SEric Dumazet } 114719f8358SEric Dumazet 115d1e37288SSu, Xuemin static int compute_score(struct sock *sk, struct net *net, 11688440ae7SBalazs Scheidler const struct in6_addr *saddr, __be16 sport, 117d1e37288SSu, Xuemin const struct in6_addr *daddr, unsigned short hnum, 1181801b570SDavid Ahern int dif, int sdif, bool exact_dif) 119db8dac20SDavid S. Miller { 12060c04aecSJoe Perches int score; 12160c04aecSJoe Perches struct inet_sock *inet; 1226da5b0f0SMike Manning bool dev_match; 123db8dac20SDavid S. Miller 12460c04aecSJoe Perches if (!net_eq(sock_net(sk), net) || 12560c04aecSJoe Perches udp_sk(sk)->udp_port_hash != hnum || 12660c04aecSJoe Perches sk->sk_family != PF_INET6) 12760c04aecSJoe Perches return -1; 128645ca708SEric Dumazet 12923b0269eSPeter Oskolkov if (!ipv6_addr_equal(&sk->sk_v6_rcv_saddr, daddr)) 13023b0269eSPeter Oskolkov return -1; 13123b0269eSPeter Oskolkov 132645ca708SEric Dumazet score = 0; 13360c04aecSJoe Perches inet = inet_sk(sk); 13460c04aecSJoe Perches 135c720c7e8SEric Dumazet if (inet->inet_dport) { 136c720c7e8SEric Dumazet if (inet->inet_dport != sport) 137645ca708SEric Dumazet return -1; 138db8dac20SDavid S. Miller score++; 139db8dac20SDavid S. Miller } 14060c04aecSJoe Perches 141efe4208fSEric Dumazet if (!ipv6_addr_any(&sk->sk_v6_daddr)) { 142efe4208fSEric Dumazet if (!ipv6_addr_equal(&sk->sk_v6_daddr, saddr)) 143645ca708SEric Dumazet return -1; 144db8dac20SDavid S. Miller score++; 145db8dac20SDavid S. Miller } 14660c04aecSJoe Perches 1476da5b0f0SMike Manning dev_match = udp_sk_bound_dev_eq(net, sk->sk_bound_dev_if, dif, sdif); 14869678bcdSPaolo Abeni if (!dev_match) 149645ca708SEric Dumazet return -1; 150db8dac20SDavid S. Miller score++; 15160c04aecSJoe Perches 15270da268bSEric Dumazet if (sk->sk_incoming_cpu == raw_smp_processor_id()) 15370da268bSEric Dumazet score++; 15470da268bSEric Dumazet 155645ca708SEric Dumazet return score; 156645ca708SEric Dumazet } 157645ca708SEric Dumazet 158d1e37288SSu, Xuemin /* called with rcu_read_lock() */ 159fddc17deSEric Dumazet static struct sock *udp6_lib_lookup2(struct net *net, 160fddc17deSEric Dumazet const struct in6_addr *saddr, __be16 sport, 1611801b570SDavid Ahern const struct in6_addr *daddr, unsigned int hnum, 1621801b570SDavid Ahern int dif, int sdif, bool exact_dif, 1631801b570SDavid Ahern struct udp_hslot *hslot2, struct sk_buff *skb) 164fddc17deSEric Dumazet { 165fddc17deSEric Dumazet struct sock *sk, *result; 166e94a62f5SPaolo Abeni int score, badness; 16772289b96STom Herbert u32 hash = 0; 168fddc17deSEric Dumazet 169fddc17deSEric Dumazet result = NULL; 170fddc17deSEric Dumazet badness = -1; 171ca065d0cSEric Dumazet udp_portaddr_for_each_entry_rcu(sk, &hslot2->head) { 172d1e37288SSu, Xuemin score = compute_score(sk, net, saddr, sport, 1731801b570SDavid Ahern daddr, hnum, dif, sdif, exact_dif); 174fddc17deSEric Dumazet if (score > badness) { 175e94a62f5SPaolo Abeni if (sk->sk_reuseport) { 176b50026b5SHannes Frederic Sowa hash = udp6_ehashfn(net, daddr, hnum, 17772289b96STom Herbert saddr, sport); 178ed0dfffdSEric Dumazet 179ca065d0cSEric Dumazet result = reuseport_select_sock(sk, hash, skb, 1801134158bSCraig Gallek sizeof(struct udphdr)); 181ca065d0cSEric Dumazet if (result) 182ca065d0cSEric Dumazet return result; 18370da268bSEric Dumazet } 184ca065d0cSEric Dumazet result = sk; 185ca065d0cSEric Dumazet badness = score; 186fddc17deSEric Dumazet } 187fddc17deSEric Dumazet } 188fddc17deSEric Dumazet return result; 189fddc17deSEric Dumazet } 190fddc17deSEric Dumazet 191ca065d0cSEric Dumazet /* rcu_read_lock() must be held */ 192fce82338SPavel Emelyanov struct sock *__udp6_lib_lookup(struct net *net, 19388440ae7SBalazs Scheidler const struct in6_addr *saddr, __be16 sport, 19488440ae7SBalazs Scheidler const struct in6_addr *daddr, __be16 dport, 1951801b570SDavid Ahern int dif, int sdif, struct udp_table *udptable, 196538950a1SCraig Gallek struct sk_buff *skb) 197645ca708SEric Dumazet { 198645ca708SEric Dumazet unsigned short hnum = ntohs(dport); 19923b0269eSPeter Oskolkov unsigned int hash2, slot2; 20023b0269eSPeter Oskolkov struct udp_hslot *hslot2; 20123b0269eSPeter Oskolkov struct sock *result; 20263a6fff3SRobert Shearman bool exact_dif = udp6_lib_exact_dif_match(net, skb); 203645ca708SEric Dumazet 204f0b1e64cSMartin KaFai Lau hash2 = ipv6_portaddr_hash(net, daddr, hnum); 205fddc17deSEric Dumazet slot2 = hash2 & udptable->mask; 206fddc17deSEric Dumazet hslot2 = &udptable->hash2[slot2]; 207fddc17deSEric Dumazet 208fddc17deSEric Dumazet result = udp6_lib_lookup2(net, saddr, sport, 2091801b570SDavid Ahern daddr, hnum, dif, sdif, exact_dif, 210d1e37288SSu, Xuemin hslot2, skb); 211fddc17deSEric Dumazet if (!result) { 212f0b1e64cSMartin KaFai Lau hash2 = ipv6_portaddr_hash(net, &in6addr_any, hnum); 213fddc17deSEric Dumazet slot2 = hash2 & udptable->mask; 214d1e37288SSu, Xuemin 215fddc17deSEric Dumazet hslot2 = &udptable->hash2[slot2]; 216fddc17deSEric Dumazet 2171223c67cSJorge Boncompte [DTI2] result = udp6_lib_lookup2(net, saddr, sport, 21823b0269eSPeter Oskolkov &in6addr_any, hnum, dif, sdif, 21963a6fff3SRobert Shearman exact_dif, hslot2, 22063a6fff3SRobert Shearman skb); 221fddc17deSEric Dumazet } 2228217ca65SMartin KaFai Lau if (unlikely(IS_ERR(result))) 2238217ca65SMartin KaFai Lau return NULL; 224fddc17deSEric Dumazet return result; 225fddc17deSEric Dumazet } 226fce82338SPavel Emelyanov EXPORT_SYMBOL_GPL(__udp6_lib_lookup); 227db8dac20SDavid S. Miller 228607c4aafSKOVACS Krisztian static struct sock *__udp6_lib_lookup_skb(struct sk_buff *skb, 229607c4aafSKOVACS Krisztian __be16 sport, __be16 dport, 230645ca708SEric Dumazet struct udp_table *udptable) 231607c4aafSKOVACS Krisztian { 232b71d1d42SEric Dumazet const struct ipv6hdr *iph = ipv6_hdr(skb); 233607c4aafSKOVACS Krisztian 234ed7cbbceSAlexander Duyck return __udp6_lib_lookup(dev_net(skb->dev), &iph->saddr, sport, 235607c4aafSKOVACS Krisztian &iph->daddr, dport, inet6_iif(skb), 2361801b570SDavid Ahern inet6_sdif(skb), udptable, skb); 237607c4aafSKOVACS Krisztian } 238607c4aafSKOVACS Krisztian 23963058308STom Herbert struct sock *udp6_lib_lookup_skb(struct sk_buff *skb, 24063058308STom Herbert __be16 sport, __be16 dport) 24163058308STom Herbert { 24263058308STom Herbert const struct ipv6hdr *iph = ipv6_hdr(skb); 24363058308STom Herbert 244ed7cbbceSAlexander Duyck return __udp6_lib_lookup(dev_net(skb->dev), &iph->saddr, sport, 24563058308STom Herbert &iph->daddr, dport, inet6_iif(skb), 2461801b570SDavid Ahern inet6_sdif(skb), &udp_table, skb); 24763058308STom Herbert } 24863058308STom Herbert EXPORT_SYMBOL_GPL(udp6_lib_lookup_skb); 24963058308STom Herbert 250ca065d0cSEric Dumazet /* Must be called under rcu_read_lock(). 251ca065d0cSEric Dumazet * Does increment socket refcount. 252ca065d0cSEric Dumazet */ 2536e86000cSArnd Bergmann #if IS_ENABLED(CONFIG_NF_TPROXY_IPV6) || IS_ENABLED(CONFIG_NF_SOCKET_IPV6) 254aa976fc0SBalazs Scheidler struct sock *udp6_lib_lookup(struct net *net, const struct in6_addr *saddr, __be16 sport, 255aa976fc0SBalazs Scheidler const struct in6_addr *daddr, __be16 dport, int dif) 256aa976fc0SBalazs Scheidler { 257ca065d0cSEric Dumazet struct sock *sk; 258ca065d0cSEric Dumazet 259ca065d0cSEric Dumazet sk = __udp6_lib_lookup(net, saddr, sport, daddr, dport, 2601801b570SDavid Ahern dif, 0, &udp_table, NULL); 26141c6d650SReshetova, Elena if (sk && !refcount_inc_not_zero(&sk->sk_refcnt)) 262ca065d0cSEric Dumazet sk = NULL; 263ca065d0cSEric Dumazet return sk; 264aa976fc0SBalazs Scheidler } 265aa976fc0SBalazs Scheidler EXPORT_SYMBOL_GPL(udp6_lib_lookup); 266ca065d0cSEric Dumazet #endif 267aa976fc0SBalazs Scheidler 268cb891fa6SPaolo Abeni /* do not use the scratch area len for jumbogram: their length execeeds the 269cb891fa6SPaolo Abeni * scratch area space; note that the IP6CB flags is still in the first 270cb891fa6SPaolo Abeni * cacheline, so checking for jumbograms is cheap 271cb891fa6SPaolo Abeni */ 272cb891fa6SPaolo Abeni static int udp6_skb_len(struct sk_buff *skb) 273cb891fa6SPaolo Abeni { 274cb891fa6SPaolo Abeni return unlikely(inet6_is_jumbogram(skb)) ? skb->len : udp_skb_len(skb); 275cb891fa6SPaolo Abeni } 276cb891fa6SPaolo Abeni 277db8dac20SDavid S. Miller /* 278db8dac20SDavid S. Miller * This should be easy, if there is something there we 279db8dac20SDavid S. Miller * return it, otherwise we block. 280db8dac20SDavid S. Miller */ 281db8dac20SDavid S. Miller 2821b784140SYing Xue int udpv6_recvmsg(struct sock *sk, struct msghdr *msg, size_t len, 283db8dac20SDavid S. Miller int noblock, int flags, int *addr_len) 284db8dac20SDavid S. Miller { 285db8dac20SDavid S. Miller struct ipv6_pinfo *np = inet6_sk(sk); 286db8dac20SDavid S. Miller struct inet_sock *inet = inet_sk(sk); 287db8dac20SDavid S. Miller struct sk_buff *skb; 28859c2cdaeSDavid S. Miller unsigned int ulen, copied; 289fd69c399SPaolo Abeni int off, err, peeking = flags & MSG_PEEK; 290db8dac20SDavid S. Miller int is_udplite = IS_UDPLITE(sk); 291543fc3fbSPaolo Abeni struct udp_mib __percpu *mib; 292197c949eSEric Dumazet bool checksum_valid = false; 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 off = sk_peek_offset(sk, flags); 303fd69c399SPaolo Abeni skb = __skb_recv_udp(sk, flags, noblock, &off, &err); 304db8dac20SDavid S. Miller if (!skb) 305627d2d6bSsamanthakumar return err; 306db8dac20SDavid S. Miller 307cb891fa6SPaolo Abeni ulen = udp6_skb_len(skb); 30859c2cdaeSDavid S. Miller copied = len; 309627d2d6bSsamanthakumar if (copied > ulen - off) 310627d2d6bSsamanthakumar copied = ulen - off; 31159c2cdaeSDavid S. Miller else if (copied < ulen) 312db8dac20SDavid S. Miller msg->msg_flags |= MSG_TRUNC; 313db8dac20SDavid S. Miller 314f26ba175SWei Yongjun is_udp4 = (skb->protocol == htons(ETH_P_IP)); 315029a3743SPaolo Abeni mib = __UDPX_MIB(sk, is_udp4); 316f26ba175SWei Yongjun 317db8dac20SDavid S. Miller /* 318db8dac20SDavid S. Miller * If checksum is needed at all, try to do it while copying the 319db8dac20SDavid S. Miller * data. If the data is truncated, or if we only want a partial 320db8dac20SDavid S. Miller * coverage checksum (UDP-Lite), do it before the copy. 321db8dac20SDavid S. Miller */ 322db8dac20SDavid S. Miller 323d21dbdfeSEric Dumazet if (copied < ulen || peeking || 324d21dbdfeSEric Dumazet (is_udplite && UDP_SKB_CB(skb)->partial_cov)) { 32567a51780SPaolo Abeni checksum_valid = udp_skb_csum_unnecessary(skb) || 32667a51780SPaolo Abeni !__udp_lib_checksum_complete(skb); 327197c949eSEric Dumazet if (!checksum_valid) 328db8dac20SDavid S. Miller goto csum_copy_err; 329db8dac20SDavid S. Miller } 330db8dac20SDavid S. Miller 33167a51780SPaolo Abeni if (checksum_valid || udp_skb_csum_unnecessary(skb)) { 33267a51780SPaolo Abeni if (udp_skb_is_linear(skb)) 33367a51780SPaolo Abeni err = copy_linear_skb(skb, copied, off, &msg->msg_iter); 33467a51780SPaolo Abeni else 335627d2d6bSsamanthakumar err = skb_copy_datagram_msg(skb, off, msg, copied); 33667a51780SPaolo Abeni } else { 337627d2d6bSsamanthakumar err = skb_copy_and_csum_datagram_msg(skb, off, msg); 338db8dac20SDavid S. Miller if (err == -EINVAL) 339db8dac20SDavid S. Miller goto csum_copy_err; 340db8dac20SDavid S. Miller } 34122911fc5SEric Dumazet if (unlikely(err)) { 342fd69c399SPaolo Abeni if (!peeking) { 343979402b1SEric Dumazet atomic_inc(&sk->sk_drops); 344029a3743SPaolo Abeni SNMP_INC_STATS(mib, UDP_MIB_INERRORS); 345979402b1SEric Dumazet } 346850cbaddSPaolo Abeni kfree_skb(skb); 347627d2d6bSsamanthakumar return err; 34822911fc5SEric Dumazet } 349fd69c399SPaolo Abeni if (!peeking) 350029a3743SPaolo Abeni SNMP_INC_STATS(mib, UDP_MIB_INDATAGRAMS); 351db8dac20SDavid S. Miller 3523b885787SNeil Horman sock_recv_ts_and_drops(msg, sk, skb); 353db8dac20SDavid S. Miller 354db8dac20SDavid S. Miller /* Copy the address. */ 355db8dac20SDavid S. Miller if (msg->msg_name) { 356342dfc30SSteffen Hurrle DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, msg->msg_name); 357db8dac20SDavid S. Miller sin6->sin6_family = AF_INET6; 358db8dac20SDavid S. Miller sin6->sin6_port = udp_hdr(skb)->source; 359db8dac20SDavid S. Miller sin6->sin6_flowinfo = 0; 360db8dac20SDavid S. Miller 361842df073SHannes Frederic Sowa if (is_udp4) { 362b301e82cSBrian Haley ipv6_addr_set_v4mapped(ip_hdr(skb)->saddr, 363b301e82cSBrian Haley &sin6->sin6_addr); 364842df073SHannes Frederic Sowa sin6->sin6_scope_id = 0; 365842df073SHannes Frederic Sowa } else { 3664e3fd7a0SAlexey Dobriyan sin6->sin6_addr = ipv6_hdr(skb)->saddr; 367842df073SHannes Frederic Sowa sin6->sin6_scope_id = 368842df073SHannes Frederic Sowa ipv6_iface_scope_id(&sin6->sin6_addr, 3694330487aSDuan Jiong inet6_iif(skb)); 370db8dac20SDavid S. Miller } 371bceaa902SHannes Frederic Sowa *addr_len = sizeof(*sin6); 372db8dac20SDavid S. Miller } 3734b261c75SHannes Frederic Sowa 374bcd1665eSPaolo Abeni if (udp_sk(sk)->gro_enabled) 375bcd1665eSPaolo Abeni udp_cmsg_recv(msg, sk, skb); 376bcd1665eSPaolo Abeni 3774b261c75SHannes Frederic Sowa if (np->rxopt.all) 3784b261c75SHannes Frederic Sowa ip6_datagram_recv_common_ctl(sk, msg, skb); 3794b261c75SHannes Frederic Sowa 380f26ba175SWei Yongjun if (is_udp4) { 381db8dac20SDavid S. Miller if (inet->cmsg_flags) 382ad959036SPaolo Abeni ip_cmsg_recv_offset(msg, sk, skb, 38310df8e61SEric Dumazet sizeof(struct udphdr), off); 384db8dac20SDavid S. Miller } else { 385db8dac20SDavid S. Miller if (np->rxopt.all) 3864b261c75SHannes Frederic Sowa ip6_datagram_recv_specific_ctl(sk, msg, skb); 387db8dac20SDavid S. Miller } 388db8dac20SDavid S. Miller 38959c2cdaeSDavid S. Miller err = copied; 390db8dac20SDavid S. Miller if (flags & MSG_TRUNC) 391db8dac20SDavid S. Miller err = ulen; 392db8dac20SDavid S. Miller 393850cbaddSPaolo Abeni skb_consume_udp(sk, skb, peeking ? -err : err); 394db8dac20SDavid S. Miller return err; 395db8dac20SDavid S. Miller 396db8dac20SDavid S. Miller csum_copy_err: 3972276f58aSPaolo Abeni if (!__sk_queue_drop_skb(sk, &udp_sk(sk)->reader_queue, skb, flags, 3982276f58aSPaolo Abeni udp_skb_destructor)) { 399029a3743SPaolo Abeni SNMP_INC_STATS(mib, UDP_MIB_CSUMERRORS); 400029a3743SPaolo Abeni SNMP_INC_STATS(mib, UDP_MIB_INERRORS); 4016a5dc9e5SEric Dumazet } 402850cbaddSPaolo Abeni kfree_skb(skb); 403db8dac20SDavid S. Miller 404beb39db5SEric Dumazet /* starting over for a new packet, but check if we need to yield */ 405beb39db5SEric Dumazet cond_resched(); 4069cfaa8deSXufeng Zhang msg->msg_flags &= ~MSG_TRUNC; 407db8dac20SDavid S. Miller goto try_again; 408db8dac20SDavid S. Miller } 409db8dac20SDavid S. Miller 410a36e185eSStefano Brivio DEFINE_STATIC_KEY_FALSE(udpv6_encap_needed_key); 411a36e185eSStefano Brivio void udpv6_encap_enable(void) 412a36e185eSStefano Brivio { 4139c480601SPaolo Abeni static_branch_inc(&udpv6_encap_needed_key); 414a36e185eSStefano Brivio } 415a36e185eSStefano Brivio EXPORT_SYMBOL(udpv6_encap_enable); 416a36e185eSStefano Brivio 417e7cc0824SStefano Brivio /* Handler for tunnels with arbitrary destination ports: no socket lookup, go 418e7cc0824SStefano Brivio * through error handlers in encapsulations looking for a match. 419e7cc0824SStefano Brivio */ 420e7cc0824SStefano Brivio static int __udp6_lib_err_encap_no_sk(struct sk_buff *skb, 421e7cc0824SStefano Brivio struct inet6_skb_parm *opt, 422424a7cd0SPaolo Abeni u8 type, u8 code, int offset, __be32 info) 423e7cc0824SStefano Brivio { 424e7cc0824SStefano Brivio int i; 425e7cc0824SStefano Brivio 426e7cc0824SStefano Brivio for (i = 0; i < MAX_IPTUN_ENCAP_OPS; i++) { 427e7cc0824SStefano Brivio int (*handler)(struct sk_buff *skb, struct inet6_skb_parm *opt, 428424a7cd0SPaolo Abeni u8 type, u8 code, int offset, __be32 info); 429424a7cd0SPaolo Abeni const struct ip6_tnl_encap_ops *encap; 430e7cc0824SStefano Brivio 431424a7cd0SPaolo Abeni encap = rcu_dereference(ip6tun_encaps[i]); 432424a7cd0SPaolo Abeni if (!encap) 433e7cc0824SStefano Brivio continue; 434424a7cd0SPaolo Abeni handler = encap->err_handler; 435e7cc0824SStefano Brivio if (handler && !handler(skb, opt, type, code, offset, info)) 436e7cc0824SStefano Brivio return 0; 437e7cc0824SStefano Brivio } 438e7cc0824SStefano Brivio 439e7cc0824SStefano Brivio return -ENOENT; 440e7cc0824SStefano Brivio } 441e7cc0824SStefano Brivio 442a36e185eSStefano Brivio /* Try to match ICMP errors to UDP tunnels by looking up a socket without 443a36e185eSStefano Brivio * reversing source and destination port: this will match tunnels that force the 444a36e185eSStefano Brivio * same destination port on both endpoints (e.g. VXLAN, GENEVE). Note that 445a36e185eSStefano Brivio * lwtunnels might actually break this assumption by being configured with 446a36e185eSStefano Brivio * different destination ports on endpoints, in this case we won't be able to 447a36e185eSStefano Brivio * trace ICMP messages back to them. 448a36e185eSStefano Brivio * 449e7cc0824SStefano Brivio * If this doesn't match any socket, probe tunnels with arbitrary destination 450e7cc0824SStefano Brivio * ports (e.g. FoU, GUE): there, the receiving socket is useless, as the port 451e7cc0824SStefano Brivio * we've sent packets to won't necessarily match the local destination port. 452e7cc0824SStefano Brivio * 453a36e185eSStefano Brivio * Then ask the tunnel implementation to match the error against a valid 454a36e185eSStefano Brivio * association. 455a36e185eSStefano Brivio * 456e7cc0824SStefano Brivio * Return an error if we can't find a match, the socket if we need further 457e7cc0824SStefano Brivio * processing, zero otherwise. 458a36e185eSStefano Brivio */ 459a36e185eSStefano Brivio static struct sock *__udp6_lib_err_encap(struct net *net, 460a36e185eSStefano Brivio const struct ipv6hdr *hdr, int offset, 461a36e185eSStefano Brivio struct udphdr *uh, 462a36e185eSStefano Brivio struct udp_table *udptable, 463e7cc0824SStefano Brivio struct sk_buff *skb, 464e7cc0824SStefano Brivio struct inet6_skb_parm *opt, 465e7cc0824SStefano Brivio u8 type, u8 code, __be32 info) 466a36e185eSStefano Brivio { 467a36e185eSStefano Brivio int network_offset, transport_offset; 468a36e185eSStefano Brivio struct sock *sk; 469a36e185eSStefano Brivio 470a36e185eSStefano Brivio network_offset = skb_network_offset(skb); 471a36e185eSStefano Brivio transport_offset = skb_transport_offset(skb); 472a36e185eSStefano Brivio 473a36e185eSStefano Brivio /* Network header needs to point to the outer IPv6 header inside ICMP */ 474a36e185eSStefano Brivio skb_reset_network_header(skb); 475a36e185eSStefano Brivio 476a36e185eSStefano Brivio /* Transport header needs to point to the UDP header */ 477a36e185eSStefano Brivio skb_set_transport_header(skb, offset); 478a36e185eSStefano Brivio 479e7cc0824SStefano Brivio sk = __udp6_lib_lookup(net, &hdr->daddr, uh->source, 480e7cc0824SStefano Brivio &hdr->saddr, uh->dest, 481e7cc0824SStefano Brivio inet6_iif(skb), 0, udptable, skb); 482e7cc0824SStefano Brivio if (sk) { 483e7cc0824SStefano Brivio int (*lookup)(struct sock *sk, struct sk_buff *skb); 484e7cc0824SStefano Brivio struct udp_sock *up = udp_sk(sk); 485e7cc0824SStefano Brivio 486a36e185eSStefano Brivio lookup = READ_ONCE(up->encap_err_lookup); 487a36e185eSStefano Brivio if (!lookup || lookup(sk, skb)) 488a36e185eSStefano Brivio sk = NULL; 489e7cc0824SStefano Brivio } 490e7cc0824SStefano Brivio 491e7cc0824SStefano Brivio if (!sk) { 492e7cc0824SStefano Brivio sk = ERR_PTR(__udp6_lib_err_encap_no_sk(skb, opt, type, code, 493e7cc0824SStefano Brivio offset, info)); 494e7cc0824SStefano Brivio } 495a36e185eSStefano Brivio 496a36e185eSStefano Brivio skb_set_transport_header(skb, transport_offset); 497a36e185eSStefano Brivio skb_set_network_header(skb, network_offset); 498e7cc0824SStefano Brivio 499a36e185eSStefano Brivio return sk; 500a36e185eSStefano Brivio } 501a36e185eSStefano Brivio 50232bbd879SStefano Brivio int __udp6_lib_err(struct sk_buff *skb, struct inet6_skb_parm *opt, 503d5fdd6baSBrian Haley u8 type, u8 code, int offset, __be32 info, 504645ca708SEric Dumazet struct udp_table *udptable) 505db8dac20SDavid S. Miller { 506db8dac20SDavid S. Miller struct ipv6_pinfo *np; 507b71d1d42SEric Dumazet const struct ipv6hdr *hdr = (const struct ipv6hdr *)skb->data; 508b71d1d42SEric Dumazet const struct in6_addr *saddr = &hdr->saddr; 509b71d1d42SEric Dumazet const struct in6_addr *daddr = &hdr->daddr; 510db8dac20SDavid S. Miller struct udphdr *uh = (struct udphdr *)(skb->data+offset); 511a36e185eSStefano Brivio bool tunnel = false; 512db8dac20SDavid S. Miller struct sock *sk; 513e0d8c1b7SWei Wang int harderr; 514db8dac20SDavid S. Miller int err; 5157304fe46SDuan Jiong struct net *net = dev_net(skb->dev); 516db8dac20SDavid S. Miller 517e32ea7e7SCraig Gallek sk = __udp6_lib_lookup(net, daddr, uh->dest, saddr, uh->source, 518f64bf6b8SMike Manning inet6_iif(skb), inet6_sdif(skb), udptable, skb); 51963159f29SIan Morris if (!sk) { 520a36e185eSStefano Brivio /* No socket for error: try tunnels before discarding */ 521e7cc0824SStefano Brivio sk = ERR_PTR(-ENOENT); 522a36e185eSStefano Brivio if (static_branch_unlikely(&udpv6_encap_needed_key)) { 523a36e185eSStefano Brivio sk = __udp6_lib_err_encap(net, hdr, offset, uh, 524e7cc0824SStefano Brivio udptable, skb, 525e7cc0824SStefano Brivio opt, type, code, info); 526e7cc0824SStefano Brivio if (!sk) 527e7cc0824SStefano Brivio return 0; 528a36e185eSStefano Brivio } 529a36e185eSStefano Brivio 530e7cc0824SStefano Brivio if (IS_ERR(sk)) { 531a16292a0SEric Dumazet __ICMP6_INC_STATS(net, __in6_dev_get(skb->dev), 5327304fe46SDuan Jiong ICMP6_MIB_INERRORS); 533e7cc0824SStefano Brivio return PTR_ERR(sk); 5347304fe46SDuan Jiong } 535e7cc0824SStefano Brivio 536a36e185eSStefano Brivio tunnel = true; 537a36e185eSStefano Brivio } 538db8dac20SDavid S. Miller 539e0d8c1b7SWei Wang harderr = icmpv6_err_convert(type, code, &err); 540e0d8c1b7SWei Wang np = inet6_sk(sk); 541e0d8c1b7SWei Wang 54293b36cf3SHannes Frederic Sowa if (type == ICMPV6_PKT_TOOBIG) { 54393b36cf3SHannes Frederic Sowa if (!ip6_sk_accept_pmtu(sk)) 54493b36cf3SHannes Frederic Sowa goto out; 54581aded24SDavid S. Miller ip6_sk_update_pmtu(skb, sk, info); 546e0d8c1b7SWei Wang if (np->pmtudisc != IPV6_PMTUDISC_DONT) 547e0d8c1b7SWei Wang harderr = 1; 54893b36cf3SHannes Frederic Sowa } 5491a462d18SDuan Jiong if (type == NDISC_REDIRECT) { 550a36e185eSStefano Brivio if (tunnel) { 551a36e185eSStefano Brivio ip6_redirect(skb, sock_net(sk), inet6_iif(skb), 552a36e185eSStefano Brivio sk->sk_mark, sk->sk_uid); 553a36e185eSStefano Brivio } else { 554ec18d9a2SDavid S. Miller ip6_sk_redirect(skb, sk); 555a36e185eSStefano Brivio } 5561a462d18SDuan Jiong goto out; 5571a462d18SDuan Jiong } 55881aded24SDavid S. Miller 559a36e185eSStefano Brivio /* Tunnels don't have an application socket: don't pass errors back */ 560a36e185eSStefano Brivio if (tunnel) 561a36e185eSStefano Brivio goto out; 562a36e185eSStefano Brivio 563e0d8c1b7SWei Wang if (!np->recverr) { 564e0d8c1b7SWei Wang if (!harderr || sk->sk_state != TCP_ESTABLISHED) 565db8dac20SDavid S. Miller goto out; 566e0d8c1b7SWei Wang } else { 567db8dac20SDavid S. Miller ipv6_icmp_error(sk, skb, err, uh->dest, ntohl(info), (u8 *)(uh+1)); 568e0d8c1b7SWei Wang } 569b1faf566SEric Dumazet 570db8dac20SDavid S. Miller sk->sk_err = err; 571db8dac20SDavid S. Miller sk->sk_error_report(sk); 572db8dac20SDavid S. Miller out: 57332bbd879SStefano Brivio return 0; 574db8dac20SDavid S. Miller } 575db8dac20SDavid S. Miller 576a3f96c47SPaolo Abeni static int __udpv6_queue_rcv_skb(struct sock *sk, struct sk_buff *skb) 577f7ad74feSBenjamin LaHaise { 578f7ad74feSBenjamin LaHaise int rc; 579f7ad74feSBenjamin LaHaise 580efe4208fSEric Dumazet if (!ipv6_addr_any(&sk->sk_v6_daddr)) { 581f7ad74feSBenjamin LaHaise sock_rps_save_rxhash(sk, skb); 582005ec974SShawn Bohrer sk_mark_napi_id(sk, skb); 5832c8c56e1SEric Dumazet sk_incoming_cpu_update(sk); 584e68b6e50SEric Dumazet } else { 585e68b6e50SEric Dumazet sk_mark_napi_id_once(sk, skb); 586005ec974SShawn Bohrer } 587f7ad74feSBenjamin LaHaise 588850cbaddSPaolo Abeni rc = __udp_enqueue_schedule_skb(sk, skb); 589f7ad74feSBenjamin LaHaise if (rc < 0) { 590f7ad74feSBenjamin LaHaise int is_udplite = IS_UDPLITE(sk); 591f7ad74feSBenjamin LaHaise 592f7ad74feSBenjamin LaHaise /* Note that an ENOMEM error is charged twice */ 593f7ad74feSBenjamin LaHaise if (rc == -ENOMEM) 594e61da9e2SEric Dumazet UDP6_INC_STATS(sock_net(sk), 595f7ad74feSBenjamin LaHaise UDP_MIB_RCVBUFERRORS, is_udplite); 596e61da9e2SEric Dumazet UDP6_INC_STATS(sock_net(sk), UDP_MIB_INERRORS, is_udplite); 597f7ad74feSBenjamin LaHaise kfree_skb(skb); 598f7ad74feSBenjamin LaHaise return -1; 599f7ad74feSBenjamin LaHaise } 600850cbaddSPaolo Abeni 601f7ad74feSBenjamin LaHaise return 0; 602f7ad74feSBenjamin LaHaise } 603f7ad74feSBenjamin LaHaise 60432bbd879SStefano Brivio static __inline__ int udpv6_err(struct sk_buff *skb, 605d5fdd6baSBrian Haley struct inet6_skb_parm *opt, u8 type, 606d5fdd6baSBrian Haley u8 code, int offset, __be32 info) 607db8dac20SDavid S. Miller { 60832bbd879SStefano Brivio return __udp6_lib_err(skb, opt, type, code, offset, info, &udp_table); 609db8dac20SDavid S. Miller } 610db8dac20SDavid S. Miller 611cf329aa4SPaolo Abeni static int udpv6_queue_rcv_one_skb(struct sock *sk, struct sk_buff *skb) 612db8dac20SDavid S. Miller { 613db8dac20SDavid S. Miller struct udp_sock *up = udp_sk(sk); 614db8dac20SDavid S. Miller int is_udplite = IS_UDPLITE(sk); 615db8dac20SDavid S. Miller 616db8dac20SDavid S. Miller if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb)) 617db8dac20SDavid S. Miller goto drop; 618db8dac20SDavid S. Miller 61988ab3108SDavidlohr Bueso if (static_branch_unlikely(&udpv6_encap_needed_key) && up->encap_type) { 620d7f3f621SBenjamin LaHaise int (*encap_rcv)(struct sock *sk, struct sk_buff *skb); 621d7f3f621SBenjamin LaHaise 622d7f3f621SBenjamin LaHaise /* 623d7f3f621SBenjamin LaHaise * This is an encapsulation socket so pass the skb to 624d7f3f621SBenjamin LaHaise * the socket's udp_encap_rcv() hook. Otherwise, just 625d7f3f621SBenjamin LaHaise * fall through and pass this up the UDP socket. 626d7f3f621SBenjamin LaHaise * up->encap_rcv() returns the following value: 627d7f3f621SBenjamin LaHaise * =0 if skb was successfully passed to the encap 628d7f3f621SBenjamin LaHaise * handler or was discarded by it. 629d7f3f621SBenjamin LaHaise * >0 if skb should be passed on to UDP. 630d7f3f621SBenjamin LaHaise * <0 if skb should be resubmitted as proto -N 631d7f3f621SBenjamin LaHaise */ 632d7f3f621SBenjamin LaHaise 633d7f3f621SBenjamin LaHaise /* if we're overly short, let UDP handle it */ 6346aa7de05SMark Rutland encap_rcv = READ_ONCE(up->encap_rcv); 635e5aed006SHannes Frederic Sowa if (encap_rcv) { 636d7f3f621SBenjamin LaHaise int ret; 637d7f3f621SBenjamin LaHaise 6380a80966bSTom Herbert /* Verify checksum before giving to encap */ 6390a80966bSTom Herbert if (udp_lib_checksum_complete(skb)) 6400a80966bSTom Herbert goto csum_error; 6410a80966bSTom Herbert 642d7f3f621SBenjamin LaHaise ret = encap_rcv(sk, skb); 643d7f3f621SBenjamin LaHaise if (ret <= 0) { 64402c22347SEric Dumazet __UDP_INC_STATS(sock_net(sk), 645d7f3f621SBenjamin LaHaise UDP_MIB_INDATAGRAMS, 646d7f3f621SBenjamin LaHaise is_udplite); 647d7f3f621SBenjamin LaHaise return -ret; 648d7f3f621SBenjamin LaHaise } 649d7f3f621SBenjamin LaHaise } 650d7f3f621SBenjamin LaHaise 651d7f3f621SBenjamin LaHaise /* FALLTHROUGH -- it's a UDP Packet */ 652d7f3f621SBenjamin LaHaise } 653d7f3f621SBenjamin LaHaise 654db8dac20SDavid S. Miller /* 655db8dac20SDavid S. Miller * UDP-Lite specific tests, ignored on UDP sockets (see net/ipv4/udp.c). 656db8dac20SDavid S. Miller */ 657db8dac20SDavid S. Miller if ((is_udplite & UDPLITE_RECV_CC) && UDP_SKB_CB(skb)->partial_cov) { 658db8dac20SDavid S. Miller 659db8dac20SDavid S. Miller if (up->pcrlen == 0) { /* full coverage was set */ 660ba7a46f1SJoe Perches net_dbg_ratelimited("UDPLITE6: partial coverage %d while full coverage %d requested\n", 661db8dac20SDavid S. Miller UDP_SKB_CB(skb)->cscov, skb->len); 662db8dac20SDavid S. Miller goto drop; 663db8dac20SDavid S. Miller } 664db8dac20SDavid S. Miller if (UDP_SKB_CB(skb)->cscov < up->pcrlen) { 665ba7a46f1SJoe Perches net_dbg_ratelimited("UDPLITE6: coverage %d too small, need min %d\n", 666db8dac20SDavid S. Miller UDP_SKB_CB(skb)->cscov, up->pcrlen); 667db8dac20SDavid S. Miller goto drop; 668db8dac20SDavid S. Miller } 669db8dac20SDavid S. Miller } 670db8dac20SDavid S. Miller 6714b943faeSPaolo Abeni prefetch(&sk->sk_rmem_alloc); 672ce25d66aSEric Dumazet if (rcu_access_pointer(sk->sk_filter) && 673ce25d66aSEric Dumazet udp_lib_checksum_complete(skb)) 6746a5dc9e5SEric Dumazet goto csum_error; 675ce25d66aSEric Dumazet 676ba66bbe5SDaniel Borkmann if (sk_filter_trim_cap(sk, skb, sizeof(struct udphdr))) 677a6127697SMichal Kubeček goto drop; 678db8dac20SDavid S. Miller 679e6afc8acSsamanthakumar udp_csum_pull_header(skb); 680cb80ef46SBenjamin LaHaise 681d826eb14SEric Dumazet skb_dst_drop(skb); 682db8dac20SDavid S. Miller 683850cbaddSPaolo Abeni return __udpv6_queue_rcv_skb(sk, skb); 6843e215c8dSJames M Leddy 6856a5dc9e5SEric Dumazet csum_error: 68602c22347SEric Dumazet __UDP6_INC_STATS(sock_net(sk), UDP_MIB_CSUMERRORS, is_udplite); 687db8dac20SDavid S. Miller drop: 68802c22347SEric Dumazet __UDP6_INC_STATS(sock_net(sk), UDP_MIB_INERRORS, is_udplite); 689cb80ef46SBenjamin LaHaise atomic_inc(&sk->sk_drops); 690db8dac20SDavid S. Miller kfree_skb(skb); 691db8dac20SDavid S. Miller return -1; 692db8dac20SDavid S. Miller } 693db8dac20SDavid S. Miller 694cf329aa4SPaolo Abeni static int udpv6_queue_rcv_skb(struct sock *sk, struct sk_buff *skb) 695cf329aa4SPaolo Abeni { 696cf329aa4SPaolo Abeni struct sk_buff *next, *segs; 697cf329aa4SPaolo Abeni int ret; 698cf329aa4SPaolo Abeni 699cf329aa4SPaolo Abeni if (likely(!udp_unexpected_gso(sk, skb))) 700cf329aa4SPaolo Abeni return udpv6_queue_rcv_one_skb(sk, skb); 701cf329aa4SPaolo Abeni 702cf329aa4SPaolo Abeni __skb_push(skb, -skb_mac_offset(skb)); 703cf329aa4SPaolo Abeni segs = udp_rcv_segment(sk, skb, false); 704cf329aa4SPaolo Abeni for (skb = segs; skb; skb = next) { 705cf329aa4SPaolo Abeni next = skb->next; 706cf329aa4SPaolo Abeni __skb_pull(skb, skb_transport_offset(skb)); 707cf329aa4SPaolo Abeni 708cf329aa4SPaolo Abeni ret = udpv6_queue_rcv_one_skb(sk, skb); 709cf329aa4SPaolo Abeni if (ret > 0) 710cf329aa4SPaolo Abeni ip6_protocol_deliver_rcu(dev_net(skb->dev), skb, ret, 711cf329aa4SPaolo Abeni true); 712cf329aa4SPaolo Abeni } 713cf329aa4SPaolo Abeni return 0; 714cf329aa4SPaolo Abeni } 715cf329aa4SPaolo Abeni 7165cf3d461SDavid Held static bool __udp_v6_is_mcast_sock(struct net *net, struct sock *sk, 717b71d1d42SEric Dumazet __be16 loc_port, const struct in6_addr *loc_addr, 718b71d1d42SEric Dumazet __be16 rmt_port, const struct in6_addr *rmt_addr, 7197bd2db40SDewi Morgan int dif, int sdif, unsigned short hnum) 720db8dac20SDavid S. Miller { 7219e89fd8bSSven Wegener struct inet_sock *inet = inet_sk(sk); 722db8dac20SDavid S. Miller 7239e89fd8bSSven Wegener if (!net_eq(sock_net(sk), net)) 7245cf3d461SDavid Held return false; 725b8ad0cbcSDaniel Lezcano 7265cf3d461SDavid Held if (udp_sk(sk)->udp_port_hash != hnum || 7275cf3d461SDavid Held sk->sk_family != PF_INET6 || 7285cf3d461SDavid Held (inet->inet_dport && inet->inet_dport != rmt_port) || 7295cf3d461SDavid Held (!ipv6_addr_any(&sk->sk_v6_daddr) && 7305cf3d461SDavid Held !ipv6_addr_equal(&sk->sk_v6_daddr, rmt_addr)) || 7317bd2db40SDewi Morgan !udp_sk_bound_dev_eq(net, sk->sk_bound_dev_if, dif, sdif) || 73233b4b015SHenning Rogge (!ipv6_addr_any(&sk->sk_v6_rcv_saddr) && 73333b4b015SHenning Rogge !ipv6_addr_equal(&sk->sk_v6_rcv_saddr, loc_addr))) 7345cf3d461SDavid Held return false; 7359e89fd8bSSven Wegener if (!inet6_mc_check(sk, loc_addr, rmt_addr)) 7365cf3d461SDavid Held return false; 7375cf3d461SDavid Held return true; 738db8dac20SDavid S. Miller } 739db8dac20SDavid S. Miller 7404068579eSTom Herbert static void udp6_csum_zero_error(struct sk_buff *skb) 7414068579eSTom Herbert { 7424068579eSTom Herbert /* RFC 2460 section 8.1 says that we SHOULD log 7434068579eSTom Herbert * this error. Well, it is reasonable. 7444068579eSTom Herbert */ 745ba7a46f1SJoe Perches net_dbg_ratelimited("IPv6: udp checksum is 0 for [%pI6c]:%u->[%pI6c]:%u\n", 7464068579eSTom Herbert &ipv6_hdr(skb)->saddr, ntohs(udp_hdr(skb)->source), 7474068579eSTom Herbert &ipv6_hdr(skb)->daddr, ntohs(udp_hdr(skb)->dest)); 7484068579eSTom Herbert } 7494068579eSTom Herbert 750db8dac20SDavid S. Miller /* 751db8dac20SDavid S. Miller * Note: called only from the BH handler context, 752db8dac20SDavid S. Miller * so we don't need to lock the hashes. 753db8dac20SDavid S. Miller */ 754e3163493SPavel Emelyanov static int __udp6_lib_mcast_deliver(struct net *net, struct sk_buff *skb, 755b71d1d42SEric Dumazet const struct in6_addr *saddr, const struct in6_addr *daddr, 75636cbb245SRick Jones struct udp_table *udptable, int proto) 757db8dac20SDavid S. Miller { 758ca065d0cSEric Dumazet struct sock *sk, *first = NULL; 759db8dac20SDavid S. Miller const struct udphdr *uh = udp_hdr(skb); 7605cf3d461SDavid Held unsigned short hnum = ntohs(uh->dest); 7615cf3d461SDavid Held struct udp_hslot *hslot = udp_hashslot(udptable, net, hnum); 762ca065d0cSEric Dumazet unsigned int offset = offsetof(typeof(*sk), sk_node); 7632dc41cffSDavid Held unsigned int hash2 = 0, hash2_any = 0, use_hash2 = (hslot->count > 10); 764ca065d0cSEric Dumazet int dif = inet6_iif(skb); 7657bd2db40SDewi Morgan int sdif = inet6_sdif(skb); 766ca065d0cSEric Dumazet struct hlist_node *node; 767ca065d0cSEric Dumazet struct sk_buff *nskb; 7682dc41cffSDavid Held 7692dc41cffSDavid Held if (use_hash2) { 770f0b1e64cSMartin KaFai Lau hash2_any = ipv6_portaddr_hash(net, &in6addr_any, hnum) & 77173e2d5e3SPablo Neira udptable->mask; 772f0b1e64cSMartin KaFai Lau hash2 = ipv6_portaddr_hash(net, daddr, hnum) & udptable->mask; 7732dc41cffSDavid Held start_lookup: 77473e2d5e3SPablo Neira hslot = &udptable->hash2[hash2]; 7752dc41cffSDavid Held offset = offsetof(typeof(*sk), __sk_common.skc_portaddr_node); 7762dc41cffSDavid Held } 777db8dac20SDavid S. Miller 778ca065d0cSEric Dumazet sk_for_each_entry_offset_rcu(sk, node, &hslot->head, offset) { 779ca065d0cSEric Dumazet if (!__udp_v6_is_mcast_sock(net, sk, uh->dest, daddr, 7807bd2db40SDewi Morgan uh->source, saddr, dif, sdif, 7817bd2db40SDewi Morgan hnum)) 782ca065d0cSEric Dumazet continue; 7831c19448cSTom Herbert /* If zero checksum and no_check is not on for 7844068579eSTom Herbert * the socket then skip it. 7854068579eSTom Herbert */ 786ca065d0cSEric Dumazet if (!uh->check && !udp_sk(sk)->no_check6_rx) 787ca065d0cSEric Dumazet continue; 788ca065d0cSEric Dumazet if (!first) { 789ca065d0cSEric Dumazet first = sk; 790ca065d0cSEric Dumazet continue; 791db8dac20SDavid S. Miller } 792ca065d0cSEric Dumazet nskb = skb_clone(skb, GFP_ATOMIC); 793ca065d0cSEric Dumazet if (unlikely(!nskb)) { 794ca065d0cSEric Dumazet atomic_inc(&sk->sk_drops); 79502c22347SEric Dumazet __UDP6_INC_STATS(net, UDP_MIB_RCVBUFERRORS, 796ca065d0cSEric Dumazet IS_UDPLITE(sk)); 79702c22347SEric Dumazet __UDP6_INC_STATS(net, UDP_MIB_INERRORS, 798ca065d0cSEric Dumazet IS_UDPLITE(sk)); 799ca065d0cSEric Dumazet continue; 800a1ab77f9SEric Dumazet } 801db8dac20SDavid S. Miller 802ca065d0cSEric Dumazet if (udpv6_queue_rcv_skb(sk, nskb) > 0) 803ca065d0cSEric Dumazet consume_skb(nskb); 804ca065d0cSEric Dumazet } 805a1ab77f9SEric Dumazet 8062dc41cffSDavid Held /* Also lookup *:port if we are using hash2 and haven't done so yet. */ 8072dc41cffSDavid Held if (use_hash2 && hash2 != hash2_any) { 8082dc41cffSDavid Held hash2 = hash2_any; 8092dc41cffSDavid Held goto start_lookup; 8102dc41cffSDavid Held } 8112dc41cffSDavid Held 812ca065d0cSEric Dumazet if (first) { 813ca065d0cSEric Dumazet if (udpv6_queue_rcv_skb(first, skb) > 0) 814ca065d0cSEric Dumazet consume_skb(skb); 815a1ab77f9SEric Dumazet } else { 816ca065d0cSEric Dumazet kfree_skb(skb); 81702c22347SEric Dumazet __UDP6_INC_STATS(net, UDP_MIB_IGNOREDMULTI, 81836cbb245SRick Jones proto == IPPROTO_UDPLITE); 819a1ab77f9SEric Dumazet } 820db8dac20SDavid S. Miller return 0; 821db8dac20SDavid S. Miller } 822db8dac20SDavid S. Miller 82364f0f5d1SPaolo Abeni static void udp6_sk_rx_dst_set(struct sock *sk, struct dst_entry *dst) 82464f0f5d1SPaolo Abeni { 82564f0f5d1SPaolo Abeni if (udp_sk_rx_dst_set(sk, dst)) { 82664f0f5d1SPaolo Abeni const struct rt6_info *rt = (const struct rt6_info *)dst; 82764f0f5d1SPaolo Abeni 82864f0f5d1SPaolo Abeni inet6_sk(sk)->rx_dst_cookie = rt6_get_cookie(rt); 82964f0f5d1SPaolo Abeni } 83064f0f5d1SPaolo Abeni } 83164f0f5d1SPaolo Abeni 832eb63f296SPaolo Abeni /* wrapper for udp_queue_rcv_skb tacking care of csum conversion and 833eb63f296SPaolo Abeni * return code conversion for ip layer consumption 834eb63f296SPaolo Abeni */ 835eb63f296SPaolo Abeni static int udp6_unicast_rcv_skb(struct sock *sk, struct sk_buff *skb, 836eb63f296SPaolo Abeni struct udphdr *uh) 837eb63f296SPaolo Abeni { 838eb63f296SPaolo Abeni int ret; 839eb63f296SPaolo Abeni 840eb63f296SPaolo Abeni if (inet_get_convert_csum(sk) && uh->check && !IS_UDPLITE(sk)) 841eb63f296SPaolo Abeni skb_checksum_try_convert(skb, IPPROTO_UDP, uh->check, 842eb63f296SPaolo Abeni ip6_compute_pseudo); 843eb63f296SPaolo Abeni 844eb63f296SPaolo Abeni ret = udpv6_queue_rcv_skb(sk, skb); 845eb63f296SPaolo Abeni 84684dad559SPaolo Abeni /* a return value > 0 means to resubmit the input */ 847eb63f296SPaolo Abeni if (ret > 0) 84884dad559SPaolo Abeni return ret; 849eb63f296SPaolo Abeni return 0; 850eb63f296SPaolo Abeni } 851eb63f296SPaolo Abeni 852645ca708SEric Dumazet int __udp6_lib_rcv(struct sk_buff *skb, struct udp_table *udptable, 853db8dac20SDavid S. Miller int proto) 854db8dac20SDavid S. Miller { 855b71d1d42SEric Dumazet const struct in6_addr *saddr, *daddr; 856ca065d0cSEric Dumazet struct net *net = dev_net(skb->dev); 857ca065d0cSEric Dumazet struct udphdr *uh; 858ca065d0cSEric Dumazet struct sock *sk; 859db8dac20SDavid S. Miller u32 ulen = 0; 860db8dac20SDavid S. Miller 861db8dac20SDavid S. Miller if (!pskb_may_pull(skb, sizeof(struct udphdr))) 862d6bc0149SBjørn Mork goto discard; 863db8dac20SDavid S. Miller 864db8dac20SDavid S. Miller saddr = &ipv6_hdr(skb)->saddr; 865db8dac20SDavid S. Miller daddr = &ipv6_hdr(skb)->daddr; 866db8dac20SDavid S. Miller uh = udp_hdr(skb); 867db8dac20SDavid S. Miller 868db8dac20SDavid S. Miller ulen = ntohs(uh->len); 869db8dac20SDavid S. Miller if (ulen > skb->len) 870db8dac20SDavid S. Miller goto short_packet; 871db8dac20SDavid S. Miller 872db8dac20SDavid S. Miller if (proto == IPPROTO_UDP) { 873db8dac20SDavid S. Miller /* UDP validates ulen. */ 874db8dac20SDavid S. Miller 875db8dac20SDavid S. Miller /* Check for jumbo payload */ 876db8dac20SDavid S. Miller if (ulen == 0) 877db8dac20SDavid S. Miller ulen = skb->len; 878db8dac20SDavid S. Miller 879db8dac20SDavid S. Miller if (ulen < sizeof(*uh)) 880db8dac20SDavid S. Miller goto short_packet; 881db8dac20SDavid S. Miller 882db8dac20SDavid S. Miller if (ulen < skb->len) { 883db8dac20SDavid S. Miller if (pskb_trim_rcsum(skb, ulen)) 884db8dac20SDavid S. Miller goto short_packet; 885db8dac20SDavid S. Miller saddr = &ipv6_hdr(skb)->saddr; 886db8dac20SDavid S. Miller daddr = &ipv6_hdr(skb)->daddr; 887db8dac20SDavid S. Miller uh = udp_hdr(skb); 888db8dac20SDavid S. Miller } 889db8dac20SDavid S. Miller } 890db8dac20SDavid S. Miller 891db8dac20SDavid S. Miller if (udp6_csum_init(skb, uh, proto)) 8926a5dc9e5SEric Dumazet goto csum_error; 893db8dac20SDavid S. Miller 894c9f2c1aeSPaolo Abeni /* Check if the socket is already available, e.g. due to early demux */ 895c9f2c1aeSPaolo Abeni sk = skb_steal_sock(skb); 896c9f2c1aeSPaolo Abeni if (sk) { 897c9f2c1aeSPaolo Abeni struct dst_entry *dst = skb_dst(skb); 898c9f2c1aeSPaolo Abeni int ret; 899c9f2c1aeSPaolo Abeni 900c9f2c1aeSPaolo Abeni if (unlikely(sk->sk_rx_dst != dst)) 90164f0f5d1SPaolo Abeni udp6_sk_rx_dst_set(sk, dst); 902c9f2c1aeSPaolo Abeni 903eb63f296SPaolo Abeni if (!uh->check && !udp_sk(sk)->no_check6_rx) { 904c9f2c1aeSPaolo Abeni sock_put(sk); 905eb63f296SPaolo Abeni goto report_csum_error; 906eb63f296SPaolo Abeni } 907c9f2c1aeSPaolo Abeni 908eb63f296SPaolo Abeni ret = udp6_unicast_rcv_skb(sk, skb, uh); 909eb63f296SPaolo Abeni sock_put(sk); 910c9f2c1aeSPaolo Abeni return ret; 911c9f2c1aeSPaolo Abeni } 912c9f2c1aeSPaolo Abeni 913db8dac20SDavid S. Miller /* 914db8dac20SDavid S. Miller * Multicast receive code 915db8dac20SDavid S. Miller */ 916db8dac20SDavid S. Miller if (ipv6_addr_is_multicast(daddr)) 917e3163493SPavel Emelyanov return __udp6_lib_mcast_deliver(net, skb, 91836cbb245SRick Jones saddr, daddr, udptable, proto); 919db8dac20SDavid S. Miller 920db8dac20SDavid S. Miller /* Unicast */ 921607c4aafSKOVACS Krisztian sk = __udp6_lib_lookup_skb(skb, uh->source, uh->dest, udptable); 92253b24b8fSIan Morris if (sk) { 923eb63f296SPaolo Abeni if (!uh->check && !udp_sk(sk)->no_check6_rx) 924eb63f296SPaolo Abeni goto report_csum_error; 925eb63f296SPaolo Abeni return udp6_unicast_rcv_skb(sk, skb, uh); 9264068579eSTom Herbert } 9274068579eSTom Herbert 928eb63f296SPaolo Abeni if (!uh->check) 929eb63f296SPaolo Abeni goto report_csum_error; 9304068579eSTom Herbert 931db8dac20SDavid S. Miller if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) 932db8dac20SDavid S. Miller goto discard; 933db8dac20SDavid S. Miller 934db8dac20SDavid S. Miller if (udp_lib_checksum_complete(skb)) 9356a5dc9e5SEric Dumazet goto csum_error; 936db8dac20SDavid S. Miller 93702c22347SEric Dumazet __UDP6_INC_STATS(net, UDP_MIB_NOPORTS, proto == IPPROTO_UDPLITE); 9383ffe533cSAlexey Dobriyan icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0); 939db8dac20SDavid S. Miller 940db8dac20SDavid S. Miller kfree_skb(skb); 941db8dac20SDavid S. Miller return 0; 942db8dac20SDavid S. Miller 943db8dac20SDavid S. Miller short_packet: 944ba7a46f1SJoe Perches net_dbg_ratelimited("UDP%sv6: short packet: From [%pI6c]:%u %d/%d to [%pI6c]:%u\n", 945db8dac20SDavid S. Miller proto == IPPROTO_UDPLITE ? "-Lite" : "", 946ba7a46f1SJoe Perches saddr, ntohs(uh->source), 947ba7a46f1SJoe Perches ulen, skb->len, 948ba7a46f1SJoe Perches daddr, ntohs(uh->dest)); 9496a5dc9e5SEric Dumazet goto discard; 950eb63f296SPaolo Abeni 951eb63f296SPaolo Abeni report_csum_error: 952eb63f296SPaolo Abeni udp6_csum_zero_error(skb); 9536a5dc9e5SEric Dumazet csum_error: 95402c22347SEric Dumazet __UDP6_INC_STATS(net, UDP_MIB_CSUMERRORS, proto == IPPROTO_UDPLITE); 955db8dac20SDavid S. Miller discard: 95602c22347SEric Dumazet __UDP6_INC_STATS(net, UDP_MIB_INERRORS, proto == IPPROTO_UDPLITE); 957db8dac20SDavid S. Miller kfree_skb(skb); 958db8dac20SDavid S. Miller return 0; 959db8dac20SDavid S. Miller } 960db8dac20SDavid S. Miller 9610bd84065Ssubashab@codeaurora.org 9625425077dSsubashab@codeaurora.org static struct sock *__udp6_lib_demux_lookup(struct net *net, 9635425077dSsubashab@codeaurora.org __be16 loc_port, const struct in6_addr *loc_addr, 9645425077dSsubashab@codeaurora.org __be16 rmt_port, const struct in6_addr *rmt_addr, 9654297a0efSDavid Ahern int dif, int sdif) 9665425077dSsubashab@codeaurora.org { 9670bd84065Ssubashab@codeaurora.org unsigned short hnum = ntohs(loc_port); 968f0b1e64cSMartin KaFai Lau unsigned int hash2 = ipv6_portaddr_hash(net, loc_addr, hnum); 9690bd84065Ssubashab@codeaurora.org unsigned int slot2 = hash2 & udp_table.mask; 9700bd84065Ssubashab@codeaurora.org struct udp_hslot *hslot2 = &udp_table.hash2[slot2]; 9710bd84065Ssubashab@codeaurora.org const __portpair ports = INET_COMBINED_PORTS(rmt_port, hnum); 9725425077dSsubashab@codeaurora.org struct sock *sk; 9735425077dSsubashab@codeaurora.org 9740bd84065Ssubashab@codeaurora.org udp_portaddr_for_each_entry_rcu(sk, &hslot2->head) { 97585cb73ffSWei Wang if (sk->sk_state == TCP_ESTABLISHED && 9764297a0efSDavid Ahern INET6_MATCH(sk, net, rmt_addr, loc_addr, ports, dif, sdif)) 9775425077dSsubashab@codeaurora.org return sk; 9780bd84065Ssubashab@codeaurora.org /* Only check first socket in chain */ 9790bd84065Ssubashab@codeaurora.org break; 9800bd84065Ssubashab@codeaurora.org } 9810bd84065Ssubashab@codeaurora.org return NULL; 9825425077dSsubashab@codeaurora.org } 9835425077dSsubashab@codeaurora.org 9845425077dSsubashab@codeaurora.org static void udp_v6_early_demux(struct sk_buff *skb) 9855425077dSsubashab@codeaurora.org { 9865425077dSsubashab@codeaurora.org struct net *net = dev_net(skb->dev); 9875425077dSsubashab@codeaurora.org const struct udphdr *uh; 9885425077dSsubashab@codeaurora.org struct sock *sk; 9895425077dSsubashab@codeaurora.org struct dst_entry *dst; 9905425077dSsubashab@codeaurora.org int dif = skb->dev->ifindex; 9914297a0efSDavid Ahern int sdif = inet6_sdif(skb); 9925425077dSsubashab@codeaurora.org 9935425077dSsubashab@codeaurora.org if (!pskb_may_pull(skb, skb_transport_offset(skb) + 9945425077dSsubashab@codeaurora.org sizeof(struct udphdr))) 9955425077dSsubashab@codeaurora.org return; 9965425077dSsubashab@codeaurora.org 9975425077dSsubashab@codeaurora.org uh = udp_hdr(skb); 9985425077dSsubashab@codeaurora.org 9995425077dSsubashab@codeaurora.org if (skb->pkt_type == PACKET_HOST) 10005425077dSsubashab@codeaurora.org sk = __udp6_lib_demux_lookup(net, uh->dest, 10015425077dSsubashab@codeaurora.org &ipv6_hdr(skb)->daddr, 10025425077dSsubashab@codeaurora.org uh->source, &ipv6_hdr(skb)->saddr, 10034297a0efSDavid Ahern dif, sdif); 10045425077dSsubashab@codeaurora.org else 10055425077dSsubashab@codeaurora.org return; 10065425077dSsubashab@codeaurora.org 100741c6d650SReshetova, Elena if (!sk || !refcount_inc_not_zero(&sk->sk_refcnt)) 10085425077dSsubashab@codeaurora.org return; 10095425077dSsubashab@codeaurora.org 10105425077dSsubashab@codeaurora.org skb->sk = sk; 10115425077dSsubashab@codeaurora.org skb->destructor = sock_efree; 10125425077dSsubashab@codeaurora.org dst = READ_ONCE(sk->sk_rx_dst); 10135425077dSsubashab@codeaurora.org 10145425077dSsubashab@codeaurora.org if (dst) 10155425077dSsubashab@codeaurora.org dst = dst_check(dst, inet6_sk(sk)->rx_dst_cookie); 10165425077dSsubashab@codeaurora.org if (dst) { 1017d24406c8SWei Wang /* set noref for now. 1018d24406c8SWei Wang * any place which wants to hold dst has to call 1019d24406c8SWei Wang * dst_hold_safe() 1020d24406c8SWei Wang */ 10215425077dSsubashab@codeaurora.org skb_dst_set_noref(skb, dst); 10225425077dSsubashab@codeaurora.org } 10235425077dSsubashab@codeaurora.org } 10245425077dSsubashab@codeaurora.org 10250e219ae4SPaolo Abeni INDIRECT_CALLABLE_SCOPE int udpv6_rcv(struct sk_buff *skb) 1026db8dac20SDavid S. Miller { 1027645ca708SEric Dumazet return __udp6_lib_rcv(skb, &udp_table, IPPROTO_UDP); 1028db8dac20SDavid S. Miller } 1029db8dac20SDavid S. Miller 1030db8dac20SDavid S. Miller /* 1031db8dac20SDavid S. Miller * Throw away all pending data and cancel the corking. Socket is locked. 1032db8dac20SDavid S. Miller */ 1033db8dac20SDavid S. Miller static void udp_v6_flush_pending_frames(struct sock *sk) 1034db8dac20SDavid S. Miller { 1035db8dac20SDavid S. Miller struct udp_sock *up = udp_sk(sk); 1036db8dac20SDavid S. Miller 103736d926b9SDenis V. Lunev if (up->pending == AF_INET) 103836d926b9SDenis V. Lunev udp_flush_pending_frames(sk); 103936d926b9SDenis V. Lunev else if (up->pending) { 1040db8dac20SDavid S. Miller up->len = 0; 1041db8dac20SDavid S. Miller up->pending = 0; 1042db8dac20SDavid S. Miller ip6_flush_pending_frames(sk); 1043db8dac20SDavid S. Miller } 1044db8dac20SDavid S. Miller } 1045db8dac20SDavid S. Miller 1046d74bad4eSAndrey Ignatov static int udpv6_pre_connect(struct sock *sk, struct sockaddr *uaddr, 1047d74bad4eSAndrey Ignatov int addr_len) 1048d74bad4eSAndrey Ignatov { 1049bddc028aSTetsuo Handa if (addr_len < offsetofend(struct sockaddr, sa_family)) 1050bddc028aSTetsuo Handa return -EINVAL; 1051d74bad4eSAndrey Ignatov /* The following checks are replicated from __ip6_datagram_connect() 1052d74bad4eSAndrey Ignatov * and intended to prevent BPF program called below from accessing 1053d74bad4eSAndrey Ignatov * bytes that are out of the bound specified by user in addr_len. 1054d74bad4eSAndrey Ignatov */ 1055d74bad4eSAndrey Ignatov if (uaddr->sa_family == AF_INET) { 1056d74bad4eSAndrey Ignatov if (__ipv6_only_sock(sk)) 1057d74bad4eSAndrey Ignatov return -EAFNOSUPPORT; 1058d74bad4eSAndrey Ignatov return udp_pre_connect(sk, uaddr, addr_len); 1059d74bad4eSAndrey Ignatov } 1060d74bad4eSAndrey Ignatov 1061d74bad4eSAndrey Ignatov if (addr_len < SIN6_LEN_RFC2133) 1062d74bad4eSAndrey Ignatov return -EINVAL; 1063d74bad4eSAndrey Ignatov 1064d74bad4eSAndrey Ignatov return BPF_CGROUP_RUN_PROG_INET6_CONNECT_LOCK(sk, uaddr); 1065d74bad4eSAndrey Ignatov } 1066d74bad4eSAndrey Ignatov 1067493c6be3SSridhar Samudrala /** 1068493c6be3SSridhar Samudrala * udp6_hwcsum_outgoing - handle outgoing HW checksumming 1069493c6be3SSridhar Samudrala * @sk: socket we are sending on 1070493c6be3SSridhar Samudrala * @skb: sk_buff containing the filled-in UDP header 1071493c6be3SSridhar Samudrala * (checksum field must be zeroed out) 1072493c6be3SSridhar Samudrala */ 1073493c6be3SSridhar Samudrala static void udp6_hwcsum_outgoing(struct sock *sk, struct sk_buff *skb, 1074493c6be3SSridhar Samudrala const struct in6_addr *saddr, 1075493c6be3SSridhar Samudrala const struct in6_addr *daddr, int len) 1076493c6be3SSridhar Samudrala { 1077493c6be3SSridhar Samudrala unsigned int offset; 1078493c6be3SSridhar Samudrala struct udphdr *uh = udp_hdr(skb); 1079d39d938cSVlad Yasevich struct sk_buff *frags = skb_shinfo(skb)->frag_list; 1080493c6be3SSridhar Samudrala __wsum csum = 0; 1081493c6be3SSridhar Samudrala 1082d39d938cSVlad Yasevich if (!frags) { 1083493c6be3SSridhar Samudrala /* Only one fragment on the socket. */ 1084493c6be3SSridhar Samudrala skb->csum_start = skb_transport_header(skb) - skb->head; 1085493c6be3SSridhar Samudrala skb->csum_offset = offsetof(struct udphdr, check); 1086493c6be3SSridhar Samudrala uh->check = ~csum_ipv6_magic(saddr, daddr, len, IPPROTO_UDP, 0); 1087493c6be3SSridhar Samudrala } else { 1088493c6be3SSridhar Samudrala /* 1089493c6be3SSridhar Samudrala * HW-checksum won't work as there are two or more 1090493c6be3SSridhar Samudrala * fragments on the socket so that all csums of sk_buffs 1091493c6be3SSridhar Samudrala * should be together 1092493c6be3SSridhar Samudrala */ 1093493c6be3SSridhar Samudrala offset = skb_transport_offset(skb); 1094493c6be3SSridhar Samudrala skb->csum = skb_checksum(skb, offset, skb->len - offset, 0); 109563ecc3d9SSubash Abhinov Kasiviswanathan csum = skb->csum; 1096493c6be3SSridhar Samudrala 1097493c6be3SSridhar Samudrala skb->ip_summed = CHECKSUM_NONE; 1098493c6be3SSridhar Samudrala 1099d39d938cSVlad Yasevich do { 1100d39d938cSVlad Yasevich csum = csum_add(csum, frags->csum); 1101d39d938cSVlad Yasevich } while ((frags = frags->next)); 1102493c6be3SSridhar Samudrala 1103493c6be3SSridhar Samudrala uh->check = csum_ipv6_magic(saddr, daddr, len, IPPROTO_UDP, 1104493c6be3SSridhar Samudrala csum); 1105493c6be3SSridhar Samudrala if (uh->check == 0) 1106493c6be3SSridhar Samudrala uh->check = CSUM_MANGLED_0; 1107493c6be3SSridhar Samudrala } 1108493c6be3SSridhar Samudrala } 1109493c6be3SSridhar Samudrala 1110db8dac20SDavid S. Miller /* 1111db8dac20SDavid S. Miller * Sending 1112db8dac20SDavid S. Miller */ 1113db8dac20SDavid S. Miller 1114bec1f6f6SWillem de Bruijn static int udp_v6_send_skb(struct sk_buff *skb, struct flowi6 *fl6, 1115bec1f6f6SWillem de Bruijn struct inet_cork *cork) 1116db8dac20SDavid S. Miller { 1117d39d938cSVlad Yasevich struct sock *sk = skb->sk; 1118db8dac20SDavid S. Miller struct udphdr *uh; 1119db8dac20SDavid S. Miller int err = 0; 1120db8dac20SDavid S. Miller int is_udplite = IS_UDPLITE(sk); 1121db8dac20SDavid S. Miller __wsum csum = 0; 1122d39d938cSVlad Yasevich int offset = skb_transport_offset(skb); 1123d39d938cSVlad Yasevich int len = skb->len - offset; 1124db8dac20SDavid S. Miller 1125db8dac20SDavid S. Miller /* 1126db8dac20SDavid S. Miller * Create a UDP header 1127db8dac20SDavid S. Miller */ 1128db8dac20SDavid S. Miller uh = udp_hdr(skb); 11291958b856SDavid S. Miller uh->source = fl6->fl6_sport; 11301958b856SDavid S. Miller uh->dest = fl6->fl6_dport; 1131d39d938cSVlad Yasevich uh->len = htons(len); 1132db8dac20SDavid S. Miller uh->check = 0; 1133db8dac20SDavid S. Miller 1134bec1f6f6SWillem de Bruijn if (cork->gso_size) { 1135bec1f6f6SWillem de Bruijn const int hlen = skb_network_header_len(skb) + 1136bec1f6f6SWillem de Bruijn sizeof(struct udphdr); 1137bec1f6f6SWillem de Bruijn 11380f149c9fSWillem de Bruijn if (hlen + cork->gso_size > cork->fragsize) { 11390f149c9fSWillem de Bruijn kfree_skb(skb); 1140bec1f6f6SWillem de Bruijn return -EINVAL; 11410f149c9fSWillem de Bruijn } 11420f149c9fSWillem de Bruijn if (skb->len > cork->gso_size * UDP_MAX_SEGMENTS) { 11430f149c9fSWillem de Bruijn kfree_skb(skb); 1144bec1f6f6SWillem de Bruijn return -EINVAL; 11450f149c9fSWillem de Bruijn } 11460f149c9fSWillem de Bruijn if (udp_sk(sk)->no_check6_tx) { 11470f149c9fSWillem de Bruijn kfree_skb(skb); 1148a8c744a8SWillem de Bruijn return -EINVAL; 11490f149c9fSWillem de Bruijn } 1150ff06342cSWillem de Bruijn if (skb->ip_summed != CHECKSUM_PARTIAL || is_udplite || 11510f149c9fSWillem de Bruijn dst_xfrm(skb_dst(skb))) { 11520f149c9fSWillem de Bruijn kfree_skb(skb); 1153bec1f6f6SWillem de Bruijn return -EIO; 11540f149c9fSWillem de Bruijn } 1155bec1f6f6SWillem de Bruijn 1156bec1f6f6SWillem de Bruijn skb_shinfo(skb)->gso_size = cork->gso_size; 1157bec1f6f6SWillem de Bruijn skb_shinfo(skb)->gso_type = SKB_GSO_UDP_L4; 1158a8c744a8SWillem de Bruijn goto csum_partial; 1159bec1f6f6SWillem de Bruijn } 1160bec1f6f6SWillem de Bruijn 1161db8dac20SDavid S. Miller if (is_udplite) 1162d39d938cSVlad Yasevich csum = udplite_csum(skb); 1163d39d938cSVlad Yasevich else if (udp_sk(sk)->no_check6_tx) { /* UDP csum disabled */ 11644068579eSTom Herbert skb->ip_summed = CHECKSUM_NONE; 11654068579eSTom Herbert goto send; 11664068579eSTom Herbert } else if (skb->ip_summed == CHECKSUM_PARTIAL) { /* UDP hardware csum */ 1167a8c744a8SWillem de Bruijn csum_partial: 1168d39d938cSVlad Yasevich udp6_hwcsum_outgoing(sk, skb, &fl6->saddr, &fl6->daddr, len); 1169493c6be3SSridhar Samudrala goto send; 1170493c6be3SSridhar Samudrala } else 1171d39d938cSVlad Yasevich csum = udp_csum(skb); 1172db8dac20SDavid S. Miller 1173db8dac20SDavid S. Miller /* add protocol-dependent pseudo-header */ 11744c9483b2SDavid S. Miller uh->check = csum_ipv6_magic(&fl6->saddr, &fl6->daddr, 1175d39d938cSVlad Yasevich len, fl6->flowi6_proto, csum); 1176db8dac20SDavid S. Miller if (uh->check == 0) 1177db8dac20SDavid S. Miller uh->check = CSUM_MANGLED_0; 1178db8dac20SDavid S. Miller 1179493c6be3SSridhar Samudrala send: 1180d39d938cSVlad Yasevich err = ip6_send_skb(skb); 11816ce9e7b5SEric Dumazet if (err) { 11826ce9e7b5SEric Dumazet if (err == -ENOBUFS && !inet6_sk(sk)->recverr) { 11836aef70a8SEric Dumazet UDP6_INC_STATS(sock_net(sk), 11846ce9e7b5SEric Dumazet UDP_MIB_SNDBUFERRORS, is_udplite); 11856ce9e7b5SEric Dumazet err = 0; 11866ce9e7b5SEric Dumazet } 11876aef70a8SEric Dumazet } else { 11886aef70a8SEric Dumazet UDP6_INC_STATS(sock_net(sk), 11896ce9e7b5SEric Dumazet UDP_MIB_OUTDATAGRAMS, is_udplite); 11906aef70a8SEric Dumazet } 1191d39d938cSVlad Yasevich return err; 1192d39d938cSVlad Yasevich } 1193d39d938cSVlad Yasevich 1194d39d938cSVlad Yasevich static int udp_v6_push_pending_frames(struct sock *sk) 1195d39d938cSVlad Yasevich { 1196d39d938cSVlad Yasevich struct sk_buff *skb; 1197d39d938cSVlad Yasevich struct udp_sock *up = udp_sk(sk); 1198d39d938cSVlad Yasevich struct flowi6 fl6; 1199d39d938cSVlad Yasevich int err = 0; 1200d39d938cSVlad Yasevich 1201d39d938cSVlad Yasevich if (up->pending == AF_INET) 1202d39d938cSVlad Yasevich return udp_push_pending_frames(sk); 1203d39d938cSVlad Yasevich 1204d39d938cSVlad Yasevich /* ip6_finish_skb will release the cork, so make a copy of 1205d39d938cSVlad Yasevich * fl6 here. 1206d39d938cSVlad Yasevich */ 1207d39d938cSVlad Yasevich fl6 = inet_sk(sk)->cork.fl.u.ip6; 1208d39d938cSVlad Yasevich 1209d39d938cSVlad Yasevich skb = ip6_finish_skb(sk); 1210d39d938cSVlad Yasevich if (!skb) 1211d39d938cSVlad Yasevich goto out; 1212d39d938cSVlad Yasevich 1213bec1f6f6SWillem de Bruijn err = udp_v6_send_skb(skb, &fl6, &inet_sk(sk)->cork.base); 1214d39d938cSVlad Yasevich 1215db8dac20SDavid S. Miller out: 1216db8dac20SDavid S. Miller up->len = 0; 1217db8dac20SDavid S. Miller up->pending = 0; 1218db8dac20SDavid S. Miller return err; 1219db8dac20SDavid S. Miller } 1220db8dac20SDavid S. Miller 12211b784140SYing Xue int udpv6_sendmsg(struct sock *sk, struct msghdr *msg, size_t len) 1222db8dac20SDavid S. Miller { 1223db8dac20SDavid S. Miller struct ipv6_txoptions opt_space; 1224db8dac20SDavid S. Miller struct udp_sock *up = udp_sk(sk); 1225db8dac20SDavid S. Miller struct inet_sock *inet = inet_sk(sk); 1226db8dac20SDavid S. Miller struct ipv6_pinfo *np = inet6_sk(sk); 1227342dfc30SSteffen Hurrle DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, msg->msg_name); 122820c59de2SArnaud Ebalard struct in6_addr *daddr, *final_p, final; 1229db8dac20SDavid S. Miller struct ipv6_txoptions *opt = NULL; 123045f6fad8SEric Dumazet struct ipv6_txoptions *opt_to_free = NULL; 1231db8dac20SDavid S. Miller struct ip6_flowlabel *flowlabel = NULL; 12324c9483b2SDavid S. Miller struct flowi6 fl6; 1233db8dac20SDavid S. Miller struct dst_entry *dst; 123426879da5SWei Wang struct ipcm6_cookie ipc6; 1235db8dac20SDavid S. Miller int addr_len = msg->msg_namelen; 12369f542f61SAlexey Kodanev bool connected = false; 1237db8dac20SDavid S. Miller int ulen = len; 1238db8dac20SDavid S. Miller int corkreq = up->corkflag || msg->msg_flags&MSG_MORE; 1239db8dac20SDavid S. Miller int err; 1240db8dac20SDavid S. Miller int is_udplite = IS_UDPLITE(sk); 1241db8dac20SDavid S. Miller int (*getfrag)(void *, char *, int, int, int, struct sk_buff *); 1242db8dac20SDavid S. Miller 1243b515430aSWillem de Bruijn ipcm6_init(&ipc6); 1244bec1f6f6SWillem de Bruijn ipc6.gso_size = up->gso_size; 12455fdaa88dSWillem de Bruijn ipc6.sockc.tsflags = sk->sk_tsflags; 124626879da5SWei Wang 1247db8dac20SDavid S. Miller /* destination address check */ 1248db8dac20SDavid S. Miller if (sin6) { 1249db8dac20SDavid S. Miller if (addr_len < offsetof(struct sockaddr, sa_data)) 1250db8dac20SDavid S. Miller return -EINVAL; 1251db8dac20SDavid S. Miller 1252db8dac20SDavid S. Miller switch (sin6->sin6_family) { 1253db8dac20SDavid S. Miller case AF_INET6: 1254db8dac20SDavid S. Miller if (addr_len < SIN6_LEN_RFC2133) 1255db8dac20SDavid S. Miller return -EINVAL; 1256db8dac20SDavid S. Miller daddr = &sin6->sin6_addr; 1257052d2369SJonathan T. Leighton if (ipv6_addr_any(daddr) && 1258052d2369SJonathan T. Leighton ipv6_addr_v4mapped(&np->saddr)) 1259052d2369SJonathan T. Leighton ipv6_addr_set_v4mapped(htonl(INADDR_LOOPBACK), 1260052d2369SJonathan T. Leighton daddr); 1261db8dac20SDavid S. Miller break; 1262db8dac20SDavid S. Miller case AF_INET: 1263db8dac20SDavid S. Miller goto do_udp_sendmsg; 1264db8dac20SDavid S. Miller case AF_UNSPEC: 1265db8dac20SDavid S. Miller msg->msg_name = sin6 = NULL; 1266db8dac20SDavid S. Miller msg->msg_namelen = addr_len = 0; 1267db8dac20SDavid S. Miller daddr = NULL; 1268db8dac20SDavid S. Miller break; 1269db8dac20SDavid S. Miller default: 1270db8dac20SDavid S. Miller return -EINVAL; 1271db8dac20SDavid S. Miller } 1272db8dac20SDavid S. Miller } else if (!up->pending) { 1273db8dac20SDavid S. Miller if (sk->sk_state != TCP_ESTABLISHED) 1274db8dac20SDavid S. Miller return -EDESTADDRREQ; 1275efe4208fSEric Dumazet daddr = &sk->sk_v6_daddr; 1276db8dac20SDavid S. Miller } else 1277db8dac20SDavid S. Miller daddr = NULL; 1278db8dac20SDavid S. Miller 1279db8dac20SDavid S. Miller if (daddr) { 1280db8dac20SDavid S. Miller if (ipv6_addr_v4mapped(daddr)) { 1281db8dac20SDavid S. Miller struct sockaddr_in sin; 1282db8dac20SDavid S. Miller sin.sin_family = AF_INET; 1283c720c7e8SEric Dumazet sin.sin_port = sin6 ? sin6->sin6_port : inet->inet_dport; 1284db8dac20SDavid S. Miller sin.sin_addr.s_addr = daddr->s6_addr32[3]; 1285db8dac20SDavid S. Miller msg->msg_name = &sin; 1286db8dac20SDavid S. Miller msg->msg_namelen = sizeof(sin); 1287db8dac20SDavid S. Miller do_udp_sendmsg: 1288db8dac20SDavid S. Miller if (__ipv6_only_sock(sk)) 1289db8dac20SDavid S. Miller return -ENETUNREACH; 12901b784140SYing Xue return udp_sendmsg(sk, msg, len); 1291db8dac20SDavid S. Miller } 1292db8dac20SDavid S. Miller } 1293db8dac20SDavid S. Miller 1294db8dac20SDavid S. Miller if (up->pending == AF_INET) 12951b784140SYing Xue return udp_sendmsg(sk, msg, len); 1296db8dac20SDavid S. Miller 1297db8dac20SDavid S. Miller /* Rough check on arithmetic overflow, 1298db8dac20SDavid S. Miller better check is made in ip6_append_data(). 1299db8dac20SDavid S. Miller */ 1300db8dac20SDavid S. Miller if (len > INT_MAX - sizeof(struct udphdr)) 1301db8dac20SDavid S. Miller return -EMSGSIZE; 1302db8dac20SDavid S. Miller 130303485f2aSVlad Yasevich getfrag = is_udplite ? udplite_getfrag : ip_generic_getfrag; 1304db8dac20SDavid S. Miller if (up->pending) { 1305db8dac20SDavid S. Miller /* 1306db8dac20SDavid S. Miller * There are pending frames. 1307db8dac20SDavid S. Miller * The socket lock must be held while it's corked. 1308db8dac20SDavid S. Miller */ 1309db8dac20SDavid S. Miller lock_sock(sk); 1310db8dac20SDavid S. Miller if (likely(up->pending)) { 1311db8dac20SDavid S. Miller if (unlikely(up->pending != AF_INET6)) { 1312db8dac20SDavid S. Miller release_sock(sk); 1313db8dac20SDavid S. Miller return -EAFNOSUPPORT; 1314db8dac20SDavid S. Miller } 1315db8dac20SDavid S. Miller dst = NULL; 1316db8dac20SDavid S. Miller goto do_append_data; 1317db8dac20SDavid S. Miller } 1318db8dac20SDavid S. Miller release_sock(sk); 1319db8dac20SDavid S. Miller } 1320db8dac20SDavid S. Miller ulen += sizeof(struct udphdr); 1321db8dac20SDavid S. Miller 13224c9483b2SDavid S. Miller memset(&fl6, 0, sizeof(fl6)); 1323db8dac20SDavid S. Miller 1324db8dac20SDavid S. Miller if (sin6) { 1325db8dac20SDavid S. Miller if (sin6->sin6_port == 0) 1326db8dac20SDavid S. Miller return -EINVAL; 1327db8dac20SDavid S. Miller 13281958b856SDavid S. Miller fl6.fl6_dport = sin6->sin6_port; 1329db8dac20SDavid S. Miller daddr = &sin6->sin6_addr; 1330db8dac20SDavid S. Miller 1331db8dac20SDavid S. Miller if (np->sndflow) { 13324c9483b2SDavid S. Miller fl6.flowlabel = sin6->sin6_flowinfo&IPV6_FLOWINFO_MASK; 13334c9483b2SDavid S. Miller if (fl6.flowlabel&IPV6_FLOWLABEL_MASK) { 13344c9483b2SDavid S. Miller flowlabel = fl6_sock_lookup(sk, fl6.flowlabel); 133563159f29SIan Morris if (!flowlabel) 1336db8dac20SDavid S. Miller return -EINVAL; 1337db8dac20SDavid S. Miller } 1338db8dac20SDavid S. Miller } 1339db8dac20SDavid S. Miller 1340db8dac20SDavid S. Miller /* 1341db8dac20SDavid S. Miller * Otherwise it will be difficult to maintain 1342db8dac20SDavid S. Miller * sk->sk_dst_cache. 1343db8dac20SDavid S. Miller */ 1344db8dac20SDavid S. Miller if (sk->sk_state == TCP_ESTABLISHED && 1345efe4208fSEric Dumazet ipv6_addr_equal(daddr, &sk->sk_v6_daddr)) 1346efe4208fSEric Dumazet daddr = &sk->sk_v6_daddr; 1347db8dac20SDavid S. Miller 1348db8dac20SDavid S. Miller if (addr_len >= sizeof(struct sockaddr_in6) && 1349db8dac20SDavid S. Miller sin6->sin6_scope_id && 1350842df073SHannes Frederic Sowa __ipv6_addr_needs_scope_id(__ipv6_addr_type(daddr))) 13514c9483b2SDavid S. Miller fl6.flowi6_oif = sin6->sin6_scope_id; 1352db8dac20SDavid S. Miller } else { 1353db8dac20SDavid S. Miller if (sk->sk_state != TCP_ESTABLISHED) 1354db8dac20SDavid S. Miller return -EDESTADDRREQ; 1355db8dac20SDavid S. Miller 13561958b856SDavid S. Miller fl6.fl6_dport = inet->inet_dport; 1357efe4208fSEric Dumazet daddr = &sk->sk_v6_daddr; 13584c9483b2SDavid S. Miller fl6.flowlabel = np->flow_label; 13599f542f61SAlexey Kodanev connected = true; 1360db8dac20SDavid S. Miller } 1361db8dac20SDavid S. Miller 13624c9483b2SDavid S. Miller if (!fl6.flowi6_oif) 13634c9483b2SDavid S. Miller fl6.flowi6_oif = sk->sk_bound_dev_if; 1364db8dac20SDavid S. Miller 13654c9483b2SDavid S. Miller if (!fl6.flowi6_oif) 13664c9483b2SDavid S. Miller fl6.flowi6_oif = np->sticky_pktinfo.ipi6_ifindex; 13679f690db7SYang Hongyang 13684c9483b2SDavid S. Miller fl6.flowi6_mark = sk->sk_mark; 1369e2d118a1SLorenzo Colitti fl6.flowi6_uid = sk->sk_uid; 137051953d5bSBrian Haley 1371db8dac20SDavid S. Miller if (msg->msg_controllen) { 1372db8dac20SDavid S. Miller opt = &opt_space; 1373db8dac20SDavid S. Miller memset(opt, 0, sizeof(struct ipv6_txoptions)); 1374db8dac20SDavid S. Miller opt->tot_len = sizeof(*opt); 137526879da5SWei Wang ipc6.opt = opt; 1376db8dac20SDavid S. Miller 13772e8de857SWillem de Bruijn err = udp_cmsg_send(sk, msg, &ipc6.gso_size); 13782e8de857SWillem de Bruijn if (err > 0) 13792e8de857SWillem de Bruijn err = ip6_datagram_send_ctl(sock_net(sk), sk, msg, &fl6, 13805fdaa88dSWillem de Bruijn &ipc6); 1381db8dac20SDavid S. Miller if (err < 0) { 1382db8dac20SDavid S. Miller fl6_sock_release(flowlabel); 1383db8dac20SDavid S. Miller return err; 1384db8dac20SDavid S. Miller } 13854c9483b2SDavid S. Miller if ((fl6.flowlabel&IPV6_FLOWLABEL_MASK) && !flowlabel) { 13864c9483b2SDavid S. Miller flowlabel = fl6_sock_lookup(sk, fl6.flowlabel); 138763159f29SIan Morris if (!flowlabel) 1388db8dac20SDavid S. Miller return -EINVAL; 1389db8dac20SDavid S. Miller } 1390db8dac20SDavid S. Miller if (!(opt->opt_nflen|opt->opt_flen)) 1391db8dac20SDavid S. Miller opt = NULL; 13929f542f61SAlexey Kodanev connected = false; 1393db8dac20SDavid S. Miller } 139445f6fad8SEric Dumazet if (!opt) { 139545f6fad8SEric Dumazet opt = txopt_get(np); 139645f6fad8SEric Dumazet opt_to_free = opt; 139745f6fad8SEric Dumazet } 1398db8dac20SDavid S. Miller if (flowlabel) 1399db8dac20SDavid S. Miller opt = fl6_merge_options(&opt_space, flowlabel, opt); 1400db8dac20SDavid S. Miller opt = ipv6_fixup_options(&opt_space, opt); 140126879da5SWei Wang ipc6.opt = opt; 1402db8dac20SDavid S. Miller 14034c9483b2SDavid S. Miller fl6.flowi6_proto = sk->sk_protocol; 14044e3fd7a0SAlexey Dobriyan fl6.daddr = *daddr; 14054c9483b2SDavid S. Miller if (ipv6_addr_any(&fl6.saddr) && !ipv6_addr_any(&np->saddr)) 14064e3fd7a0SAlexey Dobriyan fl6.saddr = np->saddr; 14071958b856SDavid S. Miller fl6.fl6_sport = inet->inet_sport; 1408db8dac20SDavid S. Miller 14091cedee13SAndrey Ignatov if (cgroup_bpf_enabled && !connected) { 14101cedee13SAndrey Ignatov err = BPF_CGROUP_RUN_PROG_UDP6_SENDMSG_LOCK(sk, 14111cedee13SAndrey Ignatov (struct sockaddr *)sin6, &fl6.saddr); 14121cedee13SAndrey Ignatov if (err) 14131cedee13SAndrey Ignatov goto out_no_dst; 14141cedee13SAndrey Ignatov if (sin6) { 14151cedee13SAndrey Ignatov if (ipv6_addr_v4mapped(&sin6->sin6_addr)) { 14161cedee13SAndrey Ignatov /* BPF program rewrote IPv6-only by IPv4-mapped 14171cedee13SAndrey Ignatov * IPv6. It's currently unsupported. 14181cedee13SAndrey Ignatov */ 14191cedee13SAndrey Ignatov err = -ENOTSUPP; 14201cedee13SAndrey Ignatov goto out_no_dst; 14211cedee13SAndrey Ignatov } 14221cedee13SAndrey Ignatov if (sin6->sin6_port == 0) { 14231cedee13SAndrey Ignatov /* BPF program set invalid port. Reject it. */ 14241cedee13SAndrey Ignatov err = -EINVAL; 14251cedee13SAndrey Ignatov goto out_no_dst; 14261cedee13SAndrey Ignatov } 14271cedee13SAndrey Ignatov fl6.fl6_dport = sin6->sin6_port; 14281cedee13SAndrey Ignatov fl6.daddr = sin6->sin6_addr; 14291cedee13SAndrey Ignatov } 14301cedee13SAndrey Ignatov } 14311cedee13SAndrey Ignatov 1432e8e36984SAndrey Ignatov if (ipv6_addr_any(&fl6.daddr)) 1433e8e36984SAndrey Ignatov fl6.daddr.s6_addr[15] = 0x1; /* :: means loopback (BSD'ism) */ 1434e8e36984SAndrey Ignatov 14354c9483b2SDavid S. Miller final_p = fl6_update_dst(&fl6, opt, &final); 143620c59de2SArnaud Ebalard if (final_p) 14379f542f61SAlexey Kodanev connected = false; 1438db8dac20SDavid S. Miller 14394c9483b2SDavid S. Miller if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr)) { 14404c9483b2SDavid S. Miller fl6.flowi6_oif = np->mcast_oif; 14419f542f61SAlexey Kodanev connected = false; 1442c4062dfcSErich E. Hoover } else if (!fl6.flowi6_oif) 1443c4062dfcSErich E. Hoover fl6.flowi6_oif = np->ucast_oif; 1444db8dac20SDavid S. Miller 14454c9483b2SDavid S. Miller security_sk_classify_flow(sk, flowi6_to_flowi(&fl6)); 1446db8dac20SDavid S. Miller 144738b7097bSHannes Frederic Sowa if (ipc6.tclass < 0) 144838b7097bSHannes Frederic Sowa ipc6.tclass = np->tclass; 144938b7097bSHannes Frederic Sowa 145038b7097bSHannes Frederic Sowa fl6.flowlabel = ip6_make_flowinfo(ipc6.tclass, fl6.flowlabel); 145138b7097bSHannes Frederic Sowa 14524f858c56SAlexey Kodanev dst = ip6_sk_dst_lookup_flow(sk, &fl6, final_p, connected); 145368d0c6d3SDavid S. Miller if (IS_ERR(dst)) { 145468d0c6d3SDavid S. Miller err = PTR_ERR(dst); 145568d0c6d3SDavid S. Miller dst = NULL; 1456db8dac20SDavid S. Miller goto out; 1457db8dac20SDavid S. Miller } 1458db8dac20SDavid S. Miller 145926879da5SWei Wang if (ipc6.hlimit < 0) 146026879da5SWei Wang ipc6.hlimit = ip6_sk_dst_hoplimit(np, &fl6, dst); 1461db8dac20SDavid S. Miller 1462db8dac20SDavid S. Miller if (msg->msg_flags&MSG_CONFIRM) 1463db8dac20SDavid S. Miller goto do_confirm; 1464db8dac20SDavid S. Miller back_from_confirm: 1465db8dac20SDavid S. Miller 146603485f2aSVlad Yasevich /* Lockless fast path for the non-corking case */ 146703485f2aSVlad Yasevich if (!corkreq) { 14681cd7884dSWillem de Bruijn struct inet_cork_full cork; 146903485f2aSVlad Yasevich struct sk_buff *skb; 147003485f2aSVlad Yasevich 147103485f2aSVlad Yasevich skb = ip6_make_skb(sk, getfrag, msg, ulen, 147226879da5SWei Wang sizeof(struct udphdr), &ipc6, 147303485f2aSVlad Yasevich &fl6, (struct rt6_info *)dst, 14745fdaa88dSWillem de Bruijn msg->msg_flags, &cork); 147503485f2aSVlad Yasevich err = PTR_ERR(skb); 147603485f2aSVlad Yasevich if (!IS_ERR_OR_NULL(skb)) 1477bec1f6f6SWillem de Bruijn err = udp_v6_send_skb(skb, &fl6, &cork.base); 14784f858c56SAlexey Kodanev goto out; 147903485f2aSVlad Yasevich } 148003485f2aSVlad Yasevich 1481db8dac20SDavid S. Miller lock_sock(sk); 1482db8dac20SDavid S. Miller if (unlikely(up->pending)) { 1483db8dac20SDavid S. Miller /* The socket is already corked while preparing it. */ 1484db8dac20SDavid S. Miller /* ... which is an evident application bug. --ANK */ 1485db8dac20SDavid S. Miller release_sock(sk); 1486db8dac20SDavid S. Miller 1487ba7a46f1SJoe Perches net_dbg_ratelimited("udp cork app bug 2\n"); 1488db8dac20SDavid S. Miller err = -EINVAL; 1489db8dac20SDavid S. Miller goto out; 1490db8dac20SDavid S. Miller } 1491db8dac20SDavid S. Miller 1492db8dac20SDavid S. Miller up->pending = AF_INET6; 1493db8dac20SDavid S. Miller 1494db8dac20SDavid S. Miller do_append_data: 149526879da5SWei Wang if (ipc6.dontfrag < 0) 149626879da5SWei Wang ipc6.dontfrag = np->dontfrag; 1497db8dac20SDavid S. Miller up->len += ulen; 149826879da5SWei Wang err = ip6_append_data(sk, getfrag, msg, ulen, sizeof(struct udphdr), 149926879da5SWei Wang &ipc6, &fl6, (struct rt6_info *)dst, 15005fdaa88dSWillem de Bruijn corkreq ? msg->msg_flags|MSG_MORE : msg->msg_flags); 1501db8dac20SDavid S. Miller if (err) 1502db8dac20SDavid S. Miller udp_v6_flush_pending_frames(sk); 1503db8dac20SDavid S. Miller else if (!corkreq) 1504db8dac20SDavid S. Miller err = udp_v6_push_pending_frames(sk); 1505db8dac20SDavid S. Miller else if (unlikely(skb_queue_empty(&sk->sk_write_queue))) 1506db8dac20SDavid S. Miller up->pending = 0; 1507db8dac20SDavid S. Miller 150803485f2aSVlad Yasevich if (err > 0) 150903485f2aSVlad Yasevich err = np->recverr ? net_xmit_errno(err) : 0; 151003485f2aSVlad Yasevich release_sock(sk); 151103485f2aSVlad Yasevich 1512db8dac20SDavid S. Miller out: 1513a3c96089SYOSHIFUJI Hideaki dst_release(dst); 15141cedee13SAndrey Ignatov out_no_dst: 1515db8dac20SDavid S. Miller fl6_sock_release(flowlabel); 151645f6fad8SEric Dumazet txopt_put(opt_to_free); 1517db8dac20SDavid S. Miller if (!err) 1518db8dac20SDavid S. Miller return len; 1519db8dac20SDavid S. Miller /* 1520db8dac20SDavid S. Miller * ENOBUFS = no kernel mem, SOCK_NOSPACE = no sndbuf space. Reporting 1521db8dac20SDavid S. Miller * ENOBUFS might not be good (it's not tunable per se), but otherwise 1522db8dac20SDavid S. Miller * we don't have a good statistic (IpOutDiscards but it can be too many 1523db8dac20SDavid S. Miller * things). We could add another new stat but at least for now that 1524db8dac20SDavid S. Miller * seems like overkill. 1525db8dac20SDavid S. Miller */ 1526db8dac20SDavid S. Miller if (err == -ENOBUFS || test_bit(SOCK_NOSPACE, &sk->sk_socket->flags)) { 15276aef70a8SEric Dumazet UDP6_INC_STATS(sock_net(sk), 1528235b9f7aSPavel Emelyanov UDP_MIB_SNDBUFERRORS, is_udplite); 1529db8dac20SDavid S. Miller } 1530db8dac20SDavid S. Miller return err; 1531db8dac20SDavid S. Miller 1532db8dac20SDavid S. Miller do_confirm: 15330dec879fSJulian Anastasov if (msg->msg_flags & MSG_PROBE) 15340dec879fSJulian Anastasov dst_confirm_neigh(dst, &fl6.daddr); 1535db8dac20SDavid S. Miller if (!(msg->msg_flags&MSG_PROBE) || len) 1536db8dac20SDavid S. Miller goto back_from_confirm; 1537db8dac20SDavid S. Miller err = 0; 1538db8dac20SDavid S. Miller goto out; 1539db8dac20SDavid S. Miller } 1540db8dac20SDavid S. Miller 15417d06b2e0SBrian Haley void udpv6_destroy_sock(struct sock *sk) 1542db8dac20SDavid S. Miller { 154344046a59STom Parkin struct udp_sock *up = udp_sk(sk); 1544db8dac20SDavid S. Miller lock_sock(sk); 1545db8dac20SDavid S. Miller udp_v6_flush_pending_frames(sk); 1546db8dac20SDavid S. Miller release_sock(sk); 1547db8dac20SDavid S. Miller 154860fb9567SPaolo Abeni if (static_branch_unlikely(&udpv6_encap_needed_key)) { 154960fb9567SPaolo Abeni if (up->encap_type) { 155044046a59STom Parkin void (*encap_destroy)(struct sock *sk); 15516aa7de05SMark Rutland encap_destroy = READ_ONCE(up->encap_destroy); 155244046a59STom Parkin if (encap_destroy) 155344046a59STom Parkin encap_destroy(sk); 155444046a59STom Parkin } 155560fb9567SPaolo Abeni if (up->encap_enabled) 15569c480601SPaolo Abeni static_branch_dec(&udpv6_encap_needed_key); 155760fb9567SPaolo Abeni } 155844046a59STom Parkin 1559db8dac20SDavid S. Miller inet6_destroy_sock(sk); 1560db8dac20SDavid S. Miller } 1561db8dac20SDavid S. Miller 1562db8dac20SDavid S. Miller /* 1563db8dac20SDavid S. Miller * Socket option code for UDP 1564db8dac20SDavid S. Miller */ 1565db8dac20SDavid S. Miller int udpv6_setsockopt(struct sock *sk, int level, int optname, 1566b7058842SDavid S. Miller char __user *optval, unsigned int optlen) 1567db8dac20SDavid S. Miller { 1568db8dac20SDavid S. Miller if (level == SOL_UDP || level == SOL_UDPLITE) 1569db8dac20SDavid S. Miller return udp_lib_setsockopt(sk, level, optname, optval, optlen, 1570db8dac20SDavid S. Miller udp_v6_push_pending_frames); 1571db8dac20SDavid S. Miller return ipv6_setsockopt(sk, level, optname, optval, optlen); 1572db8dac20SDavid S. Miller } 1573db8dac20SDavid S. Miller 1574db8dac20SDavid S. Miller #ifdef CONFIG_COMPAT 1575db8dac20SDavid S. Miller int compat_udpv6_setsockopt(struct sock *sk, int level, int optname, 1576b7058842SDavid S. Miller char __user *optval, unsigned int optlen) 1577db8dac20SDavid S. Miller { 1578db8dac20SDavid S. Miller if (level == SOL_UDP || level == SOL_UDPLITE) 1579db8dac20SDavid S. Miller return udp_lib_setsockopt(sk, level, optname, optval, optlen, 1580db8dac20SDavid S. Miller udp_v6_push_pending_frames); 1581db8dac20SDavid S. Miller return compat_ipv6_setsockopt(sk, level, optname, optval, optlen); 1582db8dac20SDavid S. Miller } 1583db8dac20SDavid S. Miller #endif 1584db8dac20SDavid S. Miller 1585db8dac20SDavid S. Miller int udpv6_getsockopt(struct sock *sk, int level, int optname, 1586db8dac20SDavid S. Miller char __user *optval, int __user *optlen) 1587db8dac20SDavid S. Miller { 1588db8dac20SDavid S. Miller if (level == SOL_UDP || level == SOL_UDPLITE) 1589db8dac20SDavid S. Miller return udp_lib_getsockopt(sk, level, optname, optval, optlen); 1590db8dac20SDavid S. Miller return ipv6_getsockopt(sk, level, optname, optval, optlen); 1591db8dac20SDavid S. Miller } 1592db8dac20SDavid S. Miller 1593db8dac20SDavid S. Miller #ifdef CONFIG_COMPAT 1594db8dac20SDavid S. Miller int compat_udpv6_getsockopt(struct sock *sk, int level, int optname, 1595db8dac20SDavid S. Miller char __user *optval, int __user *optlen) 1596db8dac20SDavid S. Miller { 1597db8dac20SDavid S. Miller if (level == SOL_UDP || level == SOL_UDPLITE) 1598db8dac20SDavid S. Miller return udp_lib_getsockopt(sk, level, optname, optval, optlen); 1599db8dac20SDavid S. Miller return compat_ipv6_getsockopt(sk, level, optname, optval, optlen); 1600db8dac20SDavid S. Miller } 1601db8dac20SDavid S. Miller #endif 1602db8dac20SDavid S. Miller 1603a8e3bb34SDavid Ahern /* thinking of making this const? Don't. 1604a8e3bb34SDavid Ahern * early_demux can change based on sysctl. 1605a8e3bb34SDavid Ahern */ 1606dddb64bcSsubashab@codeaurora.org static struct inet6_protocol udpv6_protocol = { 16075425077dSsubashab@codeaurora.org .early_demux = udp_v6_early_demux, 1608dddb64bcSsubashab@codeaurora.org .early_demux_handler = udp_v6_early_demux, 1609db8dac20SDavid S. Miller .handler = udpv6_rcv, 1610db8dac20SDavid S. Miller .err_handler = udpv6_err, 1611db8dac20SDavid S. Miller .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL, 1612db8dac20SDavid S. Miller }; 1613db8dac20SDavid S. Miller 1614db8dac20SDavid S. Miller /* ------------------------------------------------------------------------ */ 1615db8dac20SDavid S. Miller #ifdef CONFIG_PROC_FS 1616db8dac20SDavid S. Miller int udp6_seq_show(struct seq_file *seq, void *v) 1617db8dac20SDavid S. Miller { 161817ef66afSLorenzo Colitti if (v == SEQ_START_TOKEN) { 161917ef66afSLorenzo Colitti seq_puts(seq, IPV6_SEQ_DGRAM_HEADER); 162017ef66afSLorenzo Colitti } else { 162117ef66afSLorenzo Colitti int bucket = ((struct udp_iter_state *)seq->private)->bucket; 162217ef66afSLorenzo Colitti struct inet_sock *inet = inet_sk(v); 162317ef66afSLorenzo Colitti __u16 srcp = ntohs(inet->inet_sport); 162417ef66afSLorenzo Colitti __u16 destp = ntohs(inet->inet_dport); 16256c206b20SPaolo Abeni __ip6_dgram_sock_seq_show(seq, v, srcp, destp, 16266c206b20SPaolo Abeni udp_rqueue_get(v), bucket); 162717ef66afSLorenzo Colitti } 1628db8dac20SDavid S. Miller return 0; 1629db8dac20SDavid S. Miller } 1630db8dac20SDavid S. Miller 1631c3506372SChristoph Hellwig const struct seq_operations udp6_seq_ops = { 1632a3d2599bSChristoph Hellwig .start = udp_seq_start, 1633a3d2599bSChristoph Hellwig .next = udp_seq_next, 1634a3d2599bSChristoph Hellwig .stop = udp_seq_stop, 1635a3d2599bSChristoph Hellwig .show = udp6_seq_show, 1636a3d2599bSChristoph Hellwig }; 1637c3506372SChristoph Hellwig EXPORT_SYMBOL(udp6_seq_ops); 163873cb88ecSArjan van de Ven 1639db8dac20SDavid S. Miller static struct udp_seq_afinfo udp6_seq_afinfo = { 1640db8dac20SDavid S. Miller .family = AF_INET6, 1641645ca708SEric Dumazet .udp_table = &udp_table, 1642db8dac20SDavid S. Miller }; 1643db8dac20SDavid S. Miller 16442c8c1e72SAlexey Dobriyan int __net_init udp6_proc_init(struct net *net) 1645db8dac20SDavid S. Miller { 1646c3506372SChristoph Hellwig if (!proc_create_net_data("udp6", 0444, net->proc_net, &udp6_seq_ops, 1647c3506372SChristoph Hellwig sizeof(struct udp_iter_state), &udp6_seq_afinfo)) 1648a3d2599bSChristoph Hellwig return -ENOMEM; 1649a3d2599bSChristoph Hellwig return 0; 1650db8dac20SDavid S. Miller } 1651db8dac20SDavid S. Miller 1652ec120da6SIan Morris void udp6_proc_exit(struct net *net) 1653ec120da6SIan Morris { 1654a3d2599bSChristoph Hellwig remove_proc_entry("udp6", net->proc_net); 1655db8dac20SDavid S. Miller } 1656db8dac20SDavid S. Miller #endif /* CONFIG_PROC_FS */ 1657db8dac20SDavid S. Miller 1658db8dac20SDavid S. Miller /* ------------------------------------------------------------------------ */ 1659db8dac20SDavid S. Miller 1660db8dac20SDavid S. Miller struct proto udpv6_prot = { 1661db8dac20SDavid S. Miller .name = "UDPv6", 1662db8dac20SDavid S. Miller .owner = THIS_MODULE, 1663db8dac20SDavid S. Miller .close = udp_lib_close, 1664d74bad4eSAndrey Ignatov .pre_connect = udpv6_pre_connect, 1665db8dac20SDavid S. Miller .connect = ip6_datagram_connect, 1666db8dac20SDavid S. Miller .disconnect = udp_disconnect, 1667db8dac20SDavid S. Miller .ioctl = udp_ioctl, 1668850cbaddSPaolo Abeni .init = udp_init_sock, 1669db8dac20SDavid S. Miller .destroy = udpv6_destroy_sock, 1670db8dac20SDavid S. Miller .setsockopt = udpv6_setsockopt, 1671db8dac20SDavid S. Miller .getsockopt = udpv6_getsockopt, 1672db8dac20SDavid S. Miller .sendmsg = udpv6_sendmsg, 1673db8dac20SDavid S. Miller .recvmsg = udpv6_recvmsg, 1674e646b657SMartin KaFai Lau .release_cb = ip6_datagram_release_cb, 1675db8dac20SDavid S. Miller .hash = udp_lib_hash, 1676db8dac20SDavid S. Miller .unhash = udp_lib_unhash, 1677719f8358SEric Dumazet .rehash = udp_v6_rehash, 1678db8dac20SDavid S. Miller .get_port = udp_v6_get_port, 1679db8dac20SDavid S. Miller .memory_allocated = &udp_memory_allocated, 1680db8dac20SDavid S. Miller .sysctl_mem = sysctl_udp_mem, 16811e802951STonghao Zhang .sysctl_wmem_offset = offsetof(struct net, ipv4.sysctl_udp_wmem_min), 16821e802951STonghao Zhang .sysctl_rmem_offset = offsetof(struct net, ipv4.sysctl_udp_rmem_min), 1683db8dac20SDavid S. Miller .obj_size = sizeof(struct udp6_sock), 1684645ca708SEric Dumazet .h.udp_table = &udp_table, 1685db8dac20SDavid S. Miller #ifdef CONFIG_COMPAT 1686db8dac20SDavid S. Miller .compat_setsockopt = compat_udpv6_setsockopt, 1687db8dac20SDavid S. Miller .compat_getsockopt = compat_udpv6_getsockopt, 1688db8dac20SDavid S. Miller #endif 16895d77dca8SDavid Ahern .diag_destroy = udp_abort, 1690db8dac20SDavid S. Miller }; 1691db8dac20SDavid S. Miller 1692db8dac20SDavid S. Miller static struct inet_protosw udpv6_protosw = { 1693db8dac20SDavid S. Miller .type = SOCK_DGRAM, 1694db8dac20SDavid S. Miller .protocol = IPPROTO_UDP, 1695db8dac20SDavid S. Miller .prot = &udpv6_prot, 1696db8dac20SDavid S. Miller .ops = &inet6_dgram_ops, 1697db8dac20SDavid S. Miller .flags = INET_PROTOSW_PERMANENT, 1698db8dac20SDavid S. Miller }; 1699db8dac20SDavid S. Miller 1700db8dac20SDavid S. Miller int __init udpv6_init(void) 1701db8dac20SDavid S. Miller { 1702db8dac20SDavid S. Miller int ret; 1703db8dac20SDavid S. Miller 17043336288aSVlad Yasevich ret = inet6_add_protocol(&udpv6_protocol, IPPROTO_UDP); 17053336288aSVlad Yasevich if (ret) 1706c6b641a4SVlad Yasevich goto out; 17073336288aSVlad Yasevich 1708db8dac20SDavid S. Miller ret = inet6_register_protosw(&udpv6_protosw); 1709db8dac20SDavid S. Miller if (ret) 1710db8dac20SDavid S. Miller goto out_udpv6_protocol; 1711db8dac20SDavid S. Miller out: 1712db8dac20SDavid S. Miller return ret; 1713db8dac20SDavid S. Miller 1714db8dac20SDavid S. Miller out_udpv6_protocol: 1715db8dac20SDavid S. Miller inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP); 1716db8dac20SDavid S. Miller goto out; 1717db8dac20SDavid S. Miller } 1718db8dac20SDavid S. Miller 1719db8dac20SDavid S. Miller void udpv6_exit(void) 1720db8dac20SDavid S. Miller { 1721db8dac20SDavid S. Miller inet6_unregister_protosw(&udpv6_protosw); 1722db8dac20SDavid S. Miller inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP); 1723db8dac20SDavid S. Miller } 1724