1db8dac20SDavid S. Miller /* 2db8dac20SDavid S. Miller * UDP over IPv6 3db8dac20SDavid S. Miller * Linux INET6 implementation 4db8dac20SDavid S. Miller * 5db8dac20SDavid S. Miller * Authors: 6db8dac20SDavid S. Miller * Pedro Roque <roque@di.fc.ul.pt> 7db8dac20SDavid S. Miller * 8db8dac20SDavid S. Miller * Based on linux/ipv4/udp.c 9db8dac20SDavid S. Miller * 10db8dac20SDavid S. Miller * Fixes: 11db8dac20SDavid S. Miller * Hideaki YOSHIFUJI : sin6_scope_id support 12db8dac20SDavid S. Miller * YOSHIFUJI Hideaki @USAGI and: Support IPV6_V6ONLY socket option, which 13db8dac20SDavid S. Miller * Alexey Kuznetsov allow both IPv4 and IPv6 sockets to bind 14db8dac20SDavid S. Miller * a single port at the same time. 15db8dac20SDavid S. Miller * Kazunori MIYAZAWA @USAGI: change process style to use ip6_append_data 16db8dac20SDavid S. Miller * YOSHIFUJI Hideaki @USAGI: convert /proc/net/udp6 to seq_file. 17db8dac20SDavid S. Miller * 18db8dac20SDavid S. Miller * This program is free software; you can redistribute it and/or 19db8dac20SDavid S. Miller * modify it under the terms of the GNU General Public License 20db8dac20SDavid S. Miller * as published by the Free Software Foundation; either version 21db8dac20SDavid S. Miller * 2 of the License, or (at your option) any later version. 22db8dac20SDavid S. Miller */ 23db8dac20SDavid S. Miller 24db8dac20SDavid S. Miller #include <linux/errno.h> 25db8dac20SDavid S. Miller #include <linux/types.h> 26db8dac20SDavid S. Miller #include <linux/socket.h> 27db8dac20SDavid S. Miller #include <linux/sockios.h> 28db8dac20SDavid S. Miller #include <linux/net.h> 29db8dac20SDavid S. Miller #include <linux/in6.h> 30db8dac20SDavid S. Miller #include <linux/netdevice.h> 31db8dac20SDavid S. Miller #include <linux/if_arp.h> 32db8dac20SDavid S. Miller #include <linux/ipv6.h> 33db8dac20SDavid S. Miller #include <linux/icmpv6.h> 34db8dac20SDavid S. Miller #include <linux/init.h> 35db8dac20SDavid S. Miller #include <linux/module.h> 36db8dac20SDavid S. Miller #include <linux/skbuff.h> 375a0e3ad6STejun Heo #include <linux/slab.h> 387c0f6ba6SLinus Torvalds #include <linux/uaccess.h> 39db8dac20SDavid S. Miller 40496611d7SCraig Gallek #include <net/addrconf.h> 41db8dac20SDavid S. Miller #include <net/ndisc.h> 42db8dac20SDavid S. Miller #include <net/protocol.h> 43db8dac20SDavid S. Miller #include <net/transp_v6.h> 44db8dac20SDavid S. Miller #include <net/ip6_route.h> 45db8dac20SDavid S. Miller #include <net/raw.h> 46db8dac20SDavid S. Miller #include <net/tcp_states.h> 47db8dac20SDavid S. Miller #include <net/ip6_checksum.h> 48db8dac20SDavid S. Miller #include <net/xfrm.h> 490bd84065Ssubashab@codeaurora.org #include <net/inet_hashtables.h> 5072289b96STom Herbert #include <net/inet6_hashtables.h> 51076bb0c8SEliezer Tamir #include <net/busy_poll.h> 52e32ea7e7SCraig Gallek #include <net/sock_reuseport.h> 53db8dac20SDavid S. Miller 54db8dac20SDavid S. Miller #include <linux/proc_fs.h> 55db8dac20SDavid S. Miller #include <linux/seq_file.h> 5622911fc5SEric Dumazet #include <trace/events/skb.h> 57db8dac20SDavid S. Miller #include "udp_impl.h" 58db8dac20SDavid S. Miller 5963a6fff3SRobert Shearman static bool udp6_lib_exact_dif_match(struct net *net, struct sk_buff *skb) 6063a6fff3SRobert Shearman { 6163a6fff3SRobert Shearman #if defined(CONFIG_NET_L3_MASTER_DEV) 6263a6fff3SRobert Shearman if (!net->ipv4.sysctl_udp_l3mdev_accept && 6363a6fff3SRobert Shearman skb && ipv6_l3mdev_skb(IP6CB(skb)->flags)) 6463a6fff3SRobert Shearman return true; 6563a6fff3SRobert Shearman #endif 6663a6fff3SRobert Shearman return false; 6763a6fff3SRobert Shearman } 6863a6fff3SRobert Shearman 696eada011SEric Dumazet static u32 udp6_ehashfn(const struct net *net, 70b50026b5SHannes Frederic Sowa const struct in6_addr *laddr, 71b50026b5SHannes Frederic Sowa const u16 lport, 72b50026b5SHannes Frederic Sowa const struct in6_addr *faddr, 73b50026b5SHannes Frederic Sowa const __be16 fport) 74b50026b5SHannes Frederic Sowa { 751bbdceefSHannes Frederic Sowa static u32 udp6_ehash_secret __read_mostly; 761bbdceefSHannes Frederic Sowa static u32 udp_ipv6_hash_secret __read_mostly; 771bbdceefSHannes Frederic Sowa 781bbdceefSHannes Frederic Sowa u32 lhash, fhash; 791bbdceefSHannes Frederic Sowa 801bbdceefSHannes Frederic Sowa net_get_random_once(&udp6_ehash_secret, 811bbdceefSHannes Frederic Sowa sizeof(udp6_ehash_secret)); 821bbdceefSHannes Frederic Sowa net_get_random_once(&udp_ipv6_hash_secret, 831bbdceefSHannes Frederic Sowa sizeof(udp_ipv6_hash_secret)); 841bbdceefSHannes Frederic Sowa 851bbdceefSHannes Frederic Sowa lhash = (__force u32)laddr->s6_addr32[3]; 861bbdceefSHannes Frederic Sowa fhash = __ipv6_addr_jhash(faddr, udp_ipv6_hash_secret); 871bbdceefSHannes Frederic Sowa 88b50026b5SHannes Frederic Sowa return __inet6_ehashfn(lhash, lport, fhash, fport, 891bbdceefSHannes Frederic Sowa udp_ipv6_hash_secret + net_hash_mix(net)); 90b50026b5SHannes Frederic Sowa } 91b50026b5SHannes Frederic Sowa 926ba5a3c5SPavel Emelyanov int udp_v6_get_port(struct sock *sk, unsigned short snum) 93db8dac20SDavid S. Miller { 9430fff923SEric Dumazet unsigned int hash2_nulladdr = 95f0b1e64cSMartin KaFai Lau ipv6_portaddr_hash(sock_net(sk), &in6addr_any, snum); 9630fff923SEric Dumazet unsigned int hash2_partial = 97f0b1e64cSMartin KaFai Lau ipv6_portaddr_hash(sock_net(sk), &sk->sk_v6_rcv_saddr, 0); 9830fff923SEric Dumazet 99d4cada4aSEric Dumazet /* precompute partial secondary hash */ 10030fff923SEric Dumazet udp_sk(sk)->udp_portaddr_hash = hash2_partial; 101fe38d2a1SJosef Bacik return udp_lib_get_port(sk, snum, hash2_nulladdr); 102db8dac20SDavid S. Miller } 103db8dac20SDavid S. Miller 104719f8358SEric Dumazet static void udp_v6_rehash(struct sock *sk) 105719f8358SEric Dumazet { 106f0b1e64cSMartin KaFai Lau u16 new_hash = ipv6_portaddr_hash(sock_net(sk), 107efe4208fSEric Dumazet &sk->sk_v6_rcv_saddr, 108719f8358SEric Dumazet inet_sk(sk)->inet_num); 109719f8358SEric Dumazet 110719f8358SEric Dumazet udp_lib_rehash(sk, new_hash); 111719f8358SEric Dumazet } 112719f8358SEric Dumazet 113d1e37288SSu, Xuemin static int compute_score(struct sock *sk, struct net *net, 11488440ae7SBalazs Scheidler const struct in6_addr *saddr, __be16 sport, 115d1e37288SSu, Xuemin const struct in6_addr *daddr, unsigned short hnum, 1161801b570SDavid Ahern int dif, int sdif, bool exact_dif) 117db8dac20SDavid S. Miller { 11860c04aecSJoe Perches int score; 11960c04aecSJoe Perches struct inet_sock *inet; 1206da5b0f0SMike Manning bool dev_match; 121db8dac20SDavid S. Miller 12260c04aecSJoe Perches if (!net_eq(sock_net(sk), net) || 12360c04aecSJoe Perches udp_sk(sk)->udp_port_hash != hnum || 12460c04aecSJoe Perches sk->sk_family != PF_INET6) 12560c04aecSJoe Perches return -1; 126645ca708SEric Dumazet 127645ca708SEric Dumazet score = 0; 12860c04aecSJoe Perches inet = inet_sk(sk); 12960c04aecSJoe Perches 130c720c7e8SEric Dumazet if (inet->inet_dport) { 131c720c7e8SEric Dumazet if (inet->inet_dport != sport) 132645ca708SEric Dumazet return -1; 133db8dac20SDavid S. Miller score++; 134db8dac20SDavid S. Miller } 13560c04aecSJoe Perches 136efe4208fSEric Dumazet if (!ipv6_addr_any(&sk->sk_v6_rcv_saddr)) { 137efe4208fSEric Dumazet if (!ipv6_addr_equal(&sk->sk_v6_rcv_saddr, daddr)) 138645ca708SEric Dumazet return -1; 139db8dac20SDavid S. Miller score++; 140db8dac20SDavid S. Miller } 14160c04aecSJoe Perches 142efe4208fSEric Dumazet if (!ipv6_addr_any(&sk->sk_v6_daddr)) { 143efe4208fSEric Dumazet if (!ipv6_addr_equal(&sk->sk_v6_daddr, saddr)) 144645ca708SEric Dumazet return -1; 145db8dac20SDavid S. Miller score++; 146db8dac20SDavid S. Miller } 14760c04aecSJoe Perches 1486da5b0f0SMike Manning dev_match = udp_sk_bound_dev_eq(net, sk->sk_bound_dev_if, dif, sdif); 14969678bcdSPaolo Abeni if (!dev_match) 150645ca708SEric Dumazet return -1; 151db8dac20SDavid S. Miller score++; 15260c04aecSJoe Perches 15370da268bSEric Dumazet if (sk->sk_incoming_cpu == raw_smp_processor_id()) 15470da268bSEric Dumazet score++; 15570da268bSEric Dumazet 156645ca708SEric Dumazet return score; 157645ca708SEric Dumazet } 158645ca708SEric Dumazet 159d1e37288SSu, Xuemin /* called with rcu_read_lock() */ 160fddc17deSEric Dumazet static struct sock *udp6_lib_lookup2(struct net *net, 161fddc17deSEric Dumazet const struct in6_addr *saddr, __be16 sport, 1621801b570SDavid Ahern const struct in6_addr *daddr, unsigned int hnum, 1631801b570SDavid Ahern int dif, int sdif, bool exact_dif, 1641801b570SDavid Ahern struct udp_hslot *hslot2, struct sk_buff *skb) 165fddc17deSEric Dumazet { 166fddc17deSEric Dumazet struct sock *sk, *result; 167e94a62f5SPaolo Abeni int score, badness; 16872289b96STom Herbert u32 hash = 0; 169fddc17deSEric Dumazet 170fddc17deSEric Dumazet result = NULL; 171fddc17deSEric Dumazet badness = -1; 172ca065d0cSEric Dumazet udp_portaddr_for_each_entry_rcu(sk, &hslot2->head) { 173d1e37288SSu, Xuemin score = compute_score(sk, net, saddr, sport, 1741801b570SDavid Ahern daddr, hnum, dif, sdif, exact_dif); 175fddc17deSEric Dumazet if (score > badness) { 176e94a62f5SPaolo Abeni if (sk->sk_reuseport) { 177b50026b5SHannes Frederic Sowa hash = udp6_ehashfn(net, daddr, hnum, 17872289b96STom Herbert saddr, sport); 179ed0dfffdSEric Dumazet 180ca065d0cSEric Dumazet result = reuseport_select_sock(sk, hash, skb, 1811134158bSCraig Gallek sizeof(struct udphdr)); 182ca065d0cSEric Dumazet if (result) 183ca065d0cSEric Dumazet return result; 18470da268bSEric Dumazet } 185ca065d0cSEric Dumazet result = sk; 186ca065d0cSEric Dumazet badness = score; 187fddc17deSEric Dumazet } 188fddc17deSEric Dumazet } 189fddc17deSEric Dumazet return result; 190fddc17deSEric Dumazet } 191fddc17deSEric Dumazet 192ca065d0cSEric Dumazet /* rcu_read_lock() must be held */ 193fce82338SPavel Emelyanov struct sock *__udp6_lib_lookup(struct net *net, 19488440ae7SBalazs Scheidler const struct in6_addr *saddr, __be16 sport, 19588440ae7SBalazs Scheidler const struct in6_addr *daddr, __be16 dport, 1961801b570SDavid Ahern int dif, int sdif, struct udp_table *udptable, 197538950a1SCraig Gallek struct sk_buff *skb) 198645ca708SEric Dumazet { 199271b72c7SEric Dumazet struct sock *sk, *result; 200645ca708SEric Dumazet unsigned short hnum = ntohs(dport); 201fddc17deSEric Dumazet unsigned int hash2, slot2, slot = udp_hashfn(net, hnum, udptable->mask); 202fddc17deSEric Dumazet struct udp_hslot *hslot2, *hslot = &udptable->hash[slot]; 20363a6fff3SRobert Shearman bool exact_dif = udp6_lib_exact_dif_match(net, skb); 204e94a62f5SPaolo Abeni int score, badness; 20572289b96STom Herbert u32 hash = 0; 206645ca708SEric Dumazet 207fddc17deSEric Dumazet if (hslot->count > 10) { 208f0b1e64cSMartin KaFai Lau hash2 = ipv6_portaddr_hash(net, daddr, hnum); 209fddc17deSEric Dumazet slot2 = hash2 & udptable->mask; 210fddc17deSEric Dumazet hslot2 = &udptable->hash2[slot2]; 211fddc17deSEric Dumazet if (hslot->count < hslot2->count) 212fddc17deSEric Dumazet goto begin; 213fddc17deSEric Dumazet 214fddc17deSEric Dumazet result = udp6_lib_lookup2(net, saddr, sport, 2151801b570SDavid Ahern daddr, hnum, dif, sdif, exact_dif, 216d1e37288SSu, Xuemin hslot2, skb); 217fddc17deSEric Dumazet if (!result) { 218d1e37288SSu, Xuemin unsigned int old_slot2 = slot2; 219f0b1e64cSMartin KaFai Lau hash2 = ipv6_portaddr_hash(net, &in6addr_any, hnum); 220fddc17deSEric Dumazet slot2 = hash2 & udptable->mask; 221d1e37288SSu, Xuemin /* avoid searching the same slot again. */ 222d1e37288SSu, Xuemin if (unlikely(slot2 == old_slot2)) 223d1e37288SSu, Xuemin return result; 224d1e37288SSu, Xuemin 225fddc17deSEric Dumazet hslot2 = &udptable->hash2[slot2]; 226fddc17deSEric Dumazet if (hslot->count < hslot2->count) 227fddc17deSEric Dumazet goto begin; 228fddc17deSEric Dumazet 2291223c67cSJorge Boncompte [DTI2] result = udp6_lib_lookup2(net, saddr, sport, 2301801b570SDavid Ahern daddr, hnum, dif, sdif, 23163a6fff3SRobert Shearman exact_dif, hslot2, 23263a6fff3SRobert Shearman skb); 233fddc17deSEric Dumazet } 2348217ca65SMartin KaFai Lau if (unlikely(IS_ERR(result))) 2358217ca65SMartin KaFai Lau return NULL; 236fddc17deSEric Dumazet return result; 237fddc17deSEric Dumazet } 238271b72c7SEric Dumazet begin: 239271b72c7SEric Dumazet result = NULL; 240271b72c7SEric Dumazet badness = -1; 241ca065d0cSEric Dumazet sk_for_each_rcu(sk, &hslot->head) { 24263a6fff3SRobert Shearman score = compute_score(sk, net, saddr, sport, daddr, hnum, dif, 2431801b570SDavid Ahern sdif, exact_dif); 244645ca708SEric Dumazet if (score > badness) { 245e94a62f5SPaolo Abeni if (sk->sk_reuseport) { 246b50026b5SHannes Frederic Sowa hash = udp6_ehashfn(net, daddr, hnum, 24772289b96STom Herbert saddr, sport); 248ca065d0cSEric Dumazet result = reuseport_select_sock(sk, hash, skb, 249538950a1SCraig Gallek sizeof(struct udphdr)); 2508217ca65SMartin KaFai Lau if (unlikely(IS_ERR(result))) 2518217ca65SMartin KaFai Lau return NULL; 252ca065d0cSEric Dumazet if (result) 253ca065d0cSEric Dumazet return result; 25472289b96STom Herbert } 255ca065d0cSEric Dumazet result = sk; 256ca065d0cSEric Dumazet badness = score; 257db8dac20SDavid S. Miller } 258db8dac20SDavid S. Miller } 259db8dac20SDavid S. Miller return result; 260db8dac20SDavid S. Miller } 261fce82338SPavel Emelyanov EXPORT_SYMBOL_GPL(__udp6_lib_lookup); 262db8dac20SDavid S. Miller 263607c4aafSKOVACS Krisztian static struct sock *__udp6_lib_lookup_skb(struct sk_buff *skb, 264607c4aafSKOVACS Krisztian __be16 sport, __be16 dport, 265645ca708SEric Dumazet struct udp_table *udptable) 266607c4aafSKOVACS Krisztian { 267b71d1d42SEric Dumazet const struct ipv6hdr *iph = ipv6_hdr(skb); 268607c4aafSKOVACS Krisztian 269ed7cbbceSAlexander Duyck return __udp6_lib_lookup(dev_net(skb->dev), &iph->saddr, sport, 270607c4aafSKOVACS Krisztian &iph->daddr, dport, inet6_iif(skb), 2711801b570SDavid Ahern inet6_sdif(skb), udptable, skb); 272607c4aafSKOVACS Krisztian } 273607c4aafSKOVACS Krisztian 27463058308STom Herbert struct sock *udp6_lib_lookup_skb(struct sk_buff *skb, 27563058308STom Herbert __be16 sport, __be16 dport) 27663058308STom Herbert { 27763058308STom Herbert const struct ipv6hdr *iph = ipv6_hdr(skb); 27863058308STom Herbert 279ed7cbbceSAlexander Duyck return __udp6_lib_lookup(dev_net(skb->dev), &iph->saddr, sport, 28063058308STom Herbert &iph->daddr, dport, inet6_iif(skb), 2811801b570SDavid Ahern inet6_sdif(skb), &udp_table, skb); 28263058308STom Herbert } 28363058308STom Herbert EXPORT_SYMBOL_GPL(udp6_lib_lookup_skb); 28463058308STom Herbert 285ca065d0cSEric Dumazet /* Must be called under rcu_read_lock(). 286ca065d0cSEric Dumazet * Does increment socket refcount. 287ca065d0cSEric Dumazet */ 2886e86000cSArnd Bergmann #if IS_ENABLED(CONFIG_NF_TPROXY_IPV6) || IS_ENABLED(CONFIG_NF_SOCKET_IPV6) 289aa976fc0SBalazs Scheidler struct sock *udp6_lib_lookup(struct net *net, const struct in6_addr *saddr, __be16 sport, 290aa976fc0SBalazs Scheidler const struct in6_addr *daddr, __be16 dport, int dif) 291aa976fc0SBalazs Scheidler { 292ca065d0cSEric Dumazet struct sock *sk; 293ca065d0cSEric Dumazet 294ca065d0cSEric Dumazet sk = __udp6_lib_lookup(net, saddr, sport, daddr, dport, 2951801b570SDavid Ahern dif, 0, &udp_table, NULL); 29641c6d650SReshetova, Elena if (sk && !refcount_inc_not_zero(&sk->sk_refcnt)) 297ca065d0cSEric Dumazet sk = NULL; 298ca065d0cSEric Dumazet return sk; 299aa976fc0SBalazs Scheidler } 300aa976fc0SBalazs Scheidler EXPORT_SYMBOL_GPL(udp6_lib_lookup); 301ca065d0cSEric Dumazet #endif 302aa976fc0SBalazs Scheidler 303cb891fa6SPaolo Abeni /* do not use the scratch area len for jumbogram: their length execeeds the 304cb891fa6SPaolo Abeni * scratch area space; note that the IP6CB flags is still in the first 305cb891fa6SPaolo Abeni * cacheline, so checking for jumbograms is cheap 306cb891fa6SPaolo Abeni */ 307cb891fa6SPaolo Abeni static int udp6_skb_len(struct sk_buff *skb) 308cb891fa6SPaolo Abeni { 309cb891fa6SPaolo Abeni return unlikely(inet6_is_jumbogram(skb)) ? skb->len : udp_skb_len(skb); 310cb891fa6SPaolo Abeni } 311cb891fa6SPaolo Abeni 312db8dac20SDavid S. Miller /* 313db8dac20SDavid S. Miller * This should be easy, if there is something there we 314db8dac20SDavid S. Miller * return it, otherwise we block. 315db8dac20SDavid S. Miller */ 316db8dac20SDavid S. Miller 3171b784140SYing Xue int udpv6_recvmsg(struct sock *sk, struct msghdr *msg, size_t len, 318db8dac20SDavid S. Miller int noblock, int flags, int *addr_len) 319db8dac20SDavid S. Miller { 320db8dac20SDavid S. Miller struct ipv6_pinfo *np = inet6_sk(sk); 321db8dac20SDavid S. Miller struct inet_sock *inet = inet_sk(sk); 322db8dac20SDavid S. Miller struct sk_buff *skb; 32359c2cdaeSDavid S. Miller unsigned int ulen, copied; 324627d2d6bSsamanthakumar int peeked, peeking, off; 325db8dac20SDavid S. Miller int err; 326db8dac20SDavid S. Miller int is_udplite = IS_UDPLITE(sk); 327197c949eSEric Dumazet bool checksum_valid = false; 328f26ba175SWei Yongjun int is_udp4; 329db8dac20SDavid S. Miller 330db8dac20SDavid S. Miller if (flags & MSG_ERRQUEUE) 33185fbaa75SHannes Frederic Sowa return ipv6_recv_error(sk, msg, len, addr_len); 332db8dac20SDavid S. Miller 3334b340ae2SBrian Haley if (np->rxpmtu && np->rxopt.bits.rxpmtu) 33485fbaa75SHannes Frederic Sowa return ipv6_recv_rxpmtu(sk, msg, len, addr_len); 3354b340ae2SBrian Haley 336db8dac20SDavid S. Miller try_again: 337a0917e0bSMatthew Dawson peeking = flags & MSG_PEEK; 338a0917e0bSMatthew Dawson off = sk_peek_offset(sk, flags); 3397c13f97fSPaolo Abeni skb = __skb_recv_udp(sk, flags, noblock, &peeked, &off, &err); 340db8dac20SDavid S. Miller if (!skb) 341627d2d6bSsamanthakumar return err; 342db8dac20SDavid S. Miller 343cb891fa6SPaolo Abeni ulen = udp6_skb_len(skb); 34459c2cdaeSDavid S. Miller copied = len; 345627d2d6bSsamanthakumar if (copied > ulen - off) 346627d2d6bSsamanthakumar copied = ulen - off; 34759c2cdaeSDavid S. Miller else if (copied < ulen) 348db8dac20SDavid S. Miller msg->msg_flags |= MSG_TRUNC; 349db8dac20SDavid S. Miller 350f26ba175SWei Yongjun is_udp4 = (skb->protocol == htons(ETH_P_IP)); 351f26ba175SWei Yongjun 352db8dac20SDavid S. Miller /* 353db8dac20SDavid S. Miller * If checksum is needed at all, try to do it while copying the 354db8dac20SDavid S. Miller * data. If the data is truncated, or if we only want a partial 355db8dac20SDavid S. Miller * coverage checksum (UDP-Lite), do it before the copy. 356db8dac20SDavid S. Miller */ 357db8dac20SDavid S. Miller 358d21dbdfeSEric Dumazet if (copied < ulen || peeking || 359d21dbdfeSEric Dumazet (is_udplite && UDP_SKB_CB(skb)->partial_cov)) { 36067a51780SPaolo Abeni checksum_valid = udp_skb_csum_unnecessary(skb) || 36167a51780SPaolo Abeni !__udp_lib_checksum_complete(skb); 362197c949eSEric Dumazet if (!checksum_valid) 363db8dac20SDavid S. Miller goto csum_copy_err; 364db8dac20SDavid S. Miller } 365db8dac20SDavid S. Miller 36667a51780SPaolo Abeni if (checksum_valid || udp_skb_csum_unnecessary(skb)) { 36767a51780SPaolo Abeni if (udp_skb_is_linear(skb)) 36867a51780SPaolo Abeni err = copy_linear_skb(skb, copied, off, &msg->msg_iter); 36967a51780SPaolo Abeni else 370627d2d6bSsamanthakumar err = skb_copy_datagram_msg(skb, off, msg, copied); 37167a51780SPaolo Abeni } else { 372627d2d6bSsamanthakumar err = skb_copy_and_csum_datagram_msg(skb, off, msg); 373db8dac20SDavid S. Miller if (err == -EINVAL) 374db8dac20SDavid S. Miller goto csum_copy_err; 375db8dac20SDavid S. Miller } 37622911fc5SEric Dumazet if (unlikely(err)) { 377979402b1SEric Dumazet if (!peeked) { 378979402b1SEric Dumazet atomic_inc(&sk->sk_drops); 379979402b1SEric Dumazet if (is_udp4) 3806aef70a8SEric Dumazet UDP_INC_STATS(sock_net(sk), UDP_MIB_INERRORS, 381979402b1SEric Dumazet is_udplite); 382979402b1SEric Dumazet else 3836aef70a8SEric Dumazet UDP6_INC_STATS(sock_net(sk), UDP_MIB_INERRORS, 384979402b1SEric Dumazet is_udplite); 385979402b1SEric Dumazet } 386850cbaddSPaolo Abeni kfree_skb(skb); 387627d2d6bSsamanthakumar return err; 38822911fc5SEric Dumazet } 389f26ba175SWei Yongjun if (!peeked) { 390f26ba175SWei Yongjun if (is_udp4) 3916aef70a8SEric Dumazet UDP_INC_STATS(sock_net(sk), UDP_MIB_INDATAGRAMS, 3926aef70a8SEric Dumazet is_udplite); 393f26ba175SWei Yongjun else 3946aef70a8SEric Dumazet UDP6_INC_STATS(sock_net(sk), UDP_MIB_INDATAGRAMS, 3956aef70a8SEric Dumazet is_udplite); 396f26ba175SWei Yongjun } 397db8dac20SDavid S. Miller 3983b885787SNeil Horman sock_recv_ts_and_drops(msg, sk, skb); 399db8dac20SDavid S. Miller 400db8dac20SDavid S. Miller /* Copy the address. */ 401db8dac20SDavid S. Miller if (msg->msg_name) { 402342dfc30SSteffen Hurrle DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, msg->msg_name); 403db8dac20SDavid S. Miller sin6->sin6_family = AF_INET6; 404db8dac20SDavid S. Miller sin6->sin6_port = udp_hdr(skb)->source; 405db8dac20SDavid S. Miller sin6->sin6_flowinfo = 0; 406db8dac20SDavid S. Miller 407842df073SHannes Frederic Sowa if (is_udp4) { 408b301e82cSBrian Haley ipv6_addr_set_v4mapped(ip_hdr(skb)->saddr, 409b301e82cSBrian Haley &sin6->sin6_addr); 410842df073SHannes Frederic Sowa sin6->sin6_scope_id = 0; 411842df073SHannes Frederic Sowa } else { 4124e3fd7a0SAlexey Dobriyan sin6->sin6_addr = ipv6_hdr(skb)->saddr; 413842df073SHannes Frederic Sowa sin6->sin6_scope_id = 414842df073SHannes Frederic Sowa ipv6_iface_scope_id(&sin6->sin6_addr, 4154330487aSDuan Jiong inet6_iif(skb)); 416db8dac20SDavid S. Miller } 417bceaa902SHannes Frederic Sowa *addr_len = sizeof(*sin6); 418db8dac20SDavid S. Miller } 4194b261c75SHannes Frederic Sowa 420bcd1665eSPaolo Abeni if (udp_sk(sk)->gro_enabled) 421bcd1665eSPaolo Abeni udp_cmsg_recv(msg, sk, skb); 422bcd1665eSPaolo Abeni 4234b261c75SHannes Frederic Sowa if (np->rxopt.all) 4244b261c75SHannes Frederic Sowa ip6_datagram_recv_common_ctl(sk, msg, skb); 4254b261c75SHannes Frederic Sowa 426f26ba175SWei Yongjun if (is_udp4) { 427db8dac20SDavid S. Miller if (inet->cmsg_flags) 428ad959036SPaolo Abeni ip_cmsg_recv_offset(msg, sk, skb, 42910df8e61SEric Dumazet sizeof(struct udphdr), off); 430db8dac20SDavid S. Miller } else { 431db8dac20SDavid S. Miller if (np->rxopt.all) 4324b261c75SHannes Frederic Sowa ip6_datagram_recv_specific_ctl(sk, msg, skb); 433db8dac20SDavid S. Miller } 434db8dac20SDavid S. Miller 43559c2cdaeSDavid S. Miller err = copied; 436db8dac20SDavid S. Miller if (flags & MSG_TRUNC) 437db8dac20SDavid S. Miller err = ulen; 438db8dac20SDavid S. Miller 439850cbaddSPaolo Abeni skb_consume_udp(sk, skb, peeking ? -err : err); 440db8dac20SDavid S. Miller return err; 441db8dac20SDavid S. Miller 442db8dac20SDavid S. Miller csum_copy_err: 4432276f58aSPaolo Abeni if (!__sk_queue_drop_skb(sk, &udp_sk(sk)->reader_queue, skb, flags, 4442276f58aSPaolo Abeni udp_skb_destructor)) { 4456a5dc9e5SEric Dumazet if (is_udp4) { 4466aef70a8SEric Dumazet UDP_INC_STATS(sock_net(sk), 4476a5dc9e5SEric Dumazet UDP_MIB_CSUMERRORS, is_udplite); 4486aef70a8SEric Dumazet UDP_INC_STATS(sock_net(sk), 4490856f939SWei Yongjun UDP_MIB_INERRORS, is_udplite); 4506a5dc9e5SEric Dumazet } else { 4516aef70a8SEric Dumazet UDP6_INC_STATS(sock_net(sk), 4526a5dc9e5SEric Dumazet UDP_MIB_CSUMERRORS, is_udplite); 4536aef70a8SEric Dumazet UDP6_INC_STATS(sock_net(sk), 4540856f939SWei Yongjun UDP_MIB_INERRORS, is_udplite); 4550856f939SWei Yongjun } 4566a5dc9e5SEric Dumazet } 457850cbaddSPaolo Abeni kfree_skb(skb); 458db8dac20SDavid S. Miller 459beb39db5SEric Dumazet /* starting over for a new packet, but check if we need to yield */ 460beb39db5SEric Dumazet cond_resched(); 4619cfaa8deSXufeng Zhang msg->msg_flags &= ~MSG_TRUNC; 462db8dac20SDavid S. Miller goto try_again; 463db8dac20SDavid S. Miller } 464db8dac20SDavid S. Miller 465a36e185eSStefano Brivio DEFINE_STATIC_KEY_FALSE(udpv6_encap_needed_key); 466a36e185eSStefano Brivio void udpv6_encap_enable(void) 467a36e185eSStefano Brivio { 468a36e185eSStefano Brivio static_branch_enable(&udpv6_encap_needed_key); 469a36e185eSStefano Brivio } 470a36e185eSStefano Brivio EXPORT_SYMBOL(udpv6_encap_enable); 471a36e185eSStefano Brivio 472a36e185eSStefano Brivio /* Try to match ICMP errors to UDP tunnels by looking up a socket without 473a36e185eSStefano Brivio * reversing source and destination port: this will match tunnels that force the 474a36e185eSStefano Brivio * same destination port on both endpoints (e.g. VXLAN, GENEVE). Note that 475a36e185eSStefano Brivio * lwtunnels might actually break this assumption by being configured with 476a36e185eSStefano Brivio * different destination ports on endpoints, in this case we won't be able to 477a36e185eSStefano Brivio * trace ICMP messages back to them. 478a36e185eSStefano Brivio * 479a36e185eSStefano Brivio * Then ask the tunnel implementation to match the error against a valid 480a36e185eSStefano Brivio * association. 481a36e185eSStefano Brivio * 482a36e185eSStefano Brivio * Return the socket if we have a match. 483a36e185eSStefano Brivio */ 484a36e185eSStefano Brivio static struct sock *__udp6_lib_err_encap(struct net *net, 485a36e185eSStefano Brivio const struct ipv6hdr *hdr, int offset, 486a36e185eSStefano Brivio struct udphdr *uh, 487a36e185eSStefano Brivio struct udp_table *udptable, 488a36e185eSStefano Brivio struct sk_buff *skb) 489a36e185eSStefano Brivio { 490a36e185eSStefano Brivio int (*lookup)(struct sock *sk, struct sk_buff *skb); 491a36e185eSStefano Brivio int network_offset, transport_offset; 492a36e185eSStefano Brivio struct udp_sock *up; 493a36e185eSStefano Brivio struct sock *sk; 494a36e185eSStefano Brivio 495a36e185eSStefano Brivio sk = __udp6_lib_lookup(net, &hdr->daddr, uh->source, 496a36e185eSStefano Brivio &hdr->saddr, uh->dest, 497a36e185eSStefano Brivio inet6_iif(skb), 0, udptable, skb); 498a36e185eSStefano Brivio if (!sk) 499a36e185eSStefano Brivio return NULL; 500a36e185eSStefano Brivio 501a36e185eSStefano Brivio network_offset = skb_network_offset(skb); 502a36e185eSStefano Brivio transport_offset = skb_transport_offset(skb); 503a36e185eSStefano Brivio 504a36e185eSStefano Brivio /* Network header needs to point to the outer IPv6 header inside ICMP */ 505a36e185eSStefano Brivio skb_reset_network_header(skb); 506a36e185eSStefano Brivio 507a36e185eSStefano Brivio /* Transport header needs to point to the UDP header */ 508a36e185eSStefano Brivio skb_set_transport_header(skb, offset); 509a36e185eSStefano Brivio 510a36e185eSStefano Brivio up = udp_sk(sk); 511a36e185eSStefano Brivio lookup = READ_ONCE(up->encap_err_lookup); 512a36e185eSStefano Brivio if (!lookup || lookup(sk, skb)) 513a36e185eSStefano Brivio sk = NULL; 514a36e185eSStefano Brivio 515a36e185eSStefano Brivio skb_set_transport_header(skb, transport_offset); 516a36e185eSStefano Brivio skb_set_network_header(skb, network_offset); 517a36e185eSStefano Brivio return sk; 518a36e185eSStefano Brivio } 519a36e185eSStefano Brivio 52032bbd879SStefano Brivio int __udp6_lib_err(struct sk_buff *skb, struct inet6_skb_parm *opt, 521d5fdd6baSBrian Haley u8 type, u8 code, int offset, __be32 info, 522645ca708SEric Dumazet struct udp_table *udptable) 523db8dac20SDavid S. Miller { 524db8dac20SDavid S. Miller struct ipv6_pinfo *np; 525b71d1d42SEric Dumazet const struct ipv6hdr *hdr = (const struct ipv6hdr *)skb->data; 526b71d1d42SEric Dumazet const struct in6_addr *saddr = &hdr->saddr; 527b71d1d42SEric Dumazet const struct in6_addr *daddr = &hdr->daddr; 528db8dac20SDavid S. Miller struct udphdr *uh = (struct udphdr *)(skb->data+offset); 529a36e185eSStefano Brivio bool tunnel = false; 530db8dac20SDavid S. Miller struct sock *sk; 531e0d8c1b7SWei Wang int harderr; 532db8dac20SDavid S. Miller int err; 5337304fe46SDuan Jiong struct net *net = dev_net(skb->dev); 534db8dac20SDavid S. Miller 535e32ea7e7SCraig Gallek sk = __udp6_lib_lookup(net, daddr, uh->dest, saddr, uh->source, 536f64bf6b8SMike Manning inet6_iif(skb), inet6_sdif(skb), udptable, skb); 53763159f29SIan Morris if (!sk) { 538a36e185eSStefano Brivio /* No socket for error: try tunnels before discarding */ 539a36e185eSStefano Brivio if (static_branch_unlikely(&udpv6_encap_needed_key)) { 540a36e185eSStefano Brivio sk = __udp6_lib_err_encap(net, hdr, offset, uh, 541a36e185eSStefano Brivio udptable, skb); 542a36e185eSStefano Brivio } 543a36e185eSStefano Brivio 544a36e185eSStefano Brivio if (!sk) { 545a16292a0SEric Dumazet __ICMP6_INC_STATS(net, __in6_dev_get(skb->dev), 5467304fe46SDuan Jiong ICMP6_MIB_INERRORS); 54732bbd879SStefano Brivio return -ENOENT; 5487304fe46SDuan Jiong } 549a36e185eSStefano Brivio tunnel = true; 550a36e185eSStefano Brivio } 551db8dac20SDavid S. Miller 552e0d8c1b7SWei Wang harderr = icmpv6_err_convert(type, code, &err); 553e0d8c1b7SWei Wang np = inet6_sk(sk); 554e0d8c1b7SWei Wang 55593b36cf3SHannes Frederic Sowa if (type == ICMPV6_PKT_TOOBIG) { 55693b36cf3SHannes Frederic Sowa if (!ip6_sk_accept_pmtu(sk)) 55793b36cf3SHannes Frederic Sowa goto out; 55881aded24SDavid S. Miller ip6_sk_update_pmtu(skb, sk, info); 559e0d8c1b7SWei Wang if (np->pmtudisc != IPV6_PMTUDISC_DONT) 560e0d8c1b7SWei Wang harderr = 1; 56193b36cf3SHannes Frederic Sowa } 5621a462d18SDuan Jiong if (type == NDISC_REDIRECT) { 563a36e185eSStefano Brivio if (tunnel) { 564a36e185eSStefano Brivio ip6_redirect(skb, sock_net(sk), inet6_iif(skb), 565a36e185eSStefano Brivio sk->sk_mark, sk->sk_uid); 566a36e185eSStefano Brivio } else { 567ec18d9a2SDavid S. Miller ip6_sk_redirect(skb, sk); 568a36e185eSStefano Brivio } 5691a462d18SDuan Jiong goto out; 5701a462d18SDuan Jiong } 57181aded24SDavid S. Miller 572a36e185eSStefano Brivio /* Tunnels don't have an application socket: don't pass errors back */ 573a36e185eSStefano Brivio if (tunnel) 574a36e185eSStefano Brivio goto out; 575a36e185eSStefano Brivio 576e0d8c1b7SWei Wang if (!np->recverr) { 577e0d8c1b7SWei Wang if (!harderr || sk->sk_state != TCP_ESTABLISHED) 578db8dac20SDavid S. Miller goto out; 579e0d8c1b7SWei Wang } else { 580db8dac20SDavid S. Miller ipv6_icmp_error(sk, skb, err, uh->dest, ntohl(info), (u8 *)(uh+1)); 581e0d8c1b7SWei Wang } 582b1faf566SEric Dumazet 583db8dac20SDavid S. Miller sk->sk_err = err; 584db8dac20SDavid S. Miller sk->sk_error_report(sk); 585db8dac20SDavid S. Miller out: 58632bbd879SStefano Brivio return 0; 587db8dac20SDavid S. Miller } 588db8dac20SDavid S. Miller 589a3f96c47SPaolo Abeni static int __udpv6_queue_rcv_skb(struct sock *sk, struct sk_buff *skb) 590f7ad74feSBenjamin LaHaise { 591f7ad74feSBenjamin LaHaise int rc; 592f7ad74feSBenjamin LaHaise 593efe4208fSEric Dumazet if (!ipv6_addr_any(&sk->sk_v6_daddr)) { 594f7ad74feSBenjamin LaHaise sock_rps_save_rxhash(sk, skb); 595005ec974SShawn Bohrer sk_mark_napi_id(sk, skb); 5962c8c56e1SEric Dumazet sk_incoming_cpu_update(sk); 597e68b6e50SEric Dumazet } else { 598e68b6e50SEric Dumazet sk_mark_napi_id_once(sk, skb); 599005ec974SShawn Bohrer } 600f7ad74feSBenjamin LaHaise 601850cbaddSPaolo Abeni rc = __udp_enqueue_schedule_skb(sk, skb); 602f7ad74feSBenjamin LaHaise if (rc < 0) { 603f7ad74feSBenjamin LaHaise int is_udplite = IS_UDPLITE(sk); 604f7ad74feSBenjamin LaHaise 605f7ad74feSBenjamin LaHaise /* Note that an ENOMEM error is charged twice */ 606f7ad74feSBenjamin LaHaise if (rc == -ENOMEM) 607e61da9e2SEric Dumazet UDP6_INC_STATS(sock_net(sk), 608f7ad74feSBenjamin LaHaise UDP_MIB_RCVBUFERRORS, is_udplite); 609e61da9e2SEric Dumazet UDP6_INC_STATS(sock_net(sk), UDP_MIB_INERRORS, is_udplite); 610f7ad74feSBenjamin LaHaise kfree_skb(skb); 611f7ad74feSBenjamin LaHaise return -1; 612f7ad74feSBenjamin LaHaise } 613850cbaddSPaolo Abeni 614f7ad74feSBenjamin LaHaise return 0; 615f7ad74feSBenjamin LaHaise } 616f7ad74feSBenjamin LaHaise 61732bbd879SStefano Brivio static __inline__ int udpv6_err(struct sk_buff *skb, 618d5fdd6baSBrian Haley struct inet6_skb_parm *opt, u8 type, 619d5fdd6baSBrian Haley u8 code, int offset, __be32 info) 620db8dac20SDavid S. Miller { 62132bbd879SStefano Brivio return __udp6_lib_err(skb, opt, type, code, offset, info, &udp_table); 622db8dac20SDavid S. Miller } 623db8dac20SDavid S. Miller 624cf329aa4SPaolo Abeni static int udpv6_queue_rcv_one_skb(struct sock *sk, struct sk_buff *skb) 625db8dac20SDavid S. Miller { 626db8dac20SDavid S. Miller struct udp_sock *up = udp_sk(sk); 627db8dac20SDavid S. Miller int is_udplite = IS_UDPLITE(sk); 628db8dac20SDavid S. Miller 629db8dac20SDavid S. Miller if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb)) 630db8dac20SDavid S. Miller goto drop; 631db8dac20SDavid S. Miller 63288ab3108SDavidlohr Bueso if (static_branch_unlikely(&udpv6_encap_needed_key) && up->encap_type) { 633d7f3f621SBenjamin LaHaise int (*encap_rcv)(struct sock *sk, struct sk_buff *skb); 634d7f3f621SBenjamin LaHaise 635d7f3f621SBenjamin LaHaise /* 636d7f3f621SBenjamin LaHaise * This is an encapsulation socket so pass the skb to 637d7f3f621SBenjamin LaHaise * the socket's udp_encap_rcv() hook. Otherwise, just 638d7f3f621SBenjamin LaHaise * fall through and pass this up the UDP socket. 639d7f3f621SBenjamin LaHaise * up->encap_rcv() returns the following value: 640d7f3f621SBenjamin LaHaise * =0 if skb was successfully passed to the encap 641d7f3f621SBenjamin LaHaise * handler or was discarded by it. 642d7f3f621SBenjamin LaHaise * >0 if skb should be passed on to UDP. 643d7f3f621SBenjamin LaHaise * <0 if skb should be resubmitted as proto -N 644d7f3f621SBenjamin LaHaise */ 645d7f3f621SBenjamin LaHaise 646d7f3f621SBenjamin LaHaise /* if we're overly short, let UDP handle it */ 6476aa7de05SMark Rutland encap_rcv = READ_ONCE(up->encap_rcv); 648e5aed006SHannes Frederic Sowa if (encap_rcv) { 649d7f3f621SBenjamin LaHaise int ret; 650d7f3f621SBenjamin LaHaise 6510a80966bSTom Herbert /* Verify checksum before giving to encap */ 6520a80966bSTom Herbert if (udp_lib_checksum_complete(skb)) 6530a80966bSTom Herbert goto csum_error; 6540a80966bSTom Herbert 655d7f3f621SBenjamin LaHaise ret = encap_rcv(sk, skb); 656d7f3f621SBenjamin LaHaise if (ret <= 0) { 65702c22347SEric Dumazet __UDP_INC_STATS(sock_net(sk), 658d7f3f621SBenjamin LaHaise UDP_MIB_INDATAGRAMS, 659d7f3f621SBenjamin LaHaise is_udplite); 660d7f3f621SBenjamin LaHaise return -ret; 661d7f3f621SBenjamin LaHaise } 662d7f3f621SBenjamin LaHaise } 663d7f3f621SBenjamin LaHaise 664d7f3f621SBenjamin LaHaise /* FALLTHROUGH -- it's a UDP Packet */ 665d7f3f621SBenjamin LaHaise } 666d7f3f621SBenjamin LaHaise 667db8dac20SDavid S. Miller /* 668db8dac20SDavid S. Miller * UDP-Lite specific tests, ignored on UDP sockets (see net/ipv4/udp.c). 669db8dac20SDavid S. Miller */ 670db8dac20SDavid S. Miller if ((is_udplite & UDPLITE_RECV_CC) && UDP_SKB_CB(skb)->partial_cov) { 671db8dac20SDavid S. Miller 672db8dac20SDavid S. Miller if (up->pcrlen == 0) { /* full coverage was set */ 673ba7a46f1SJoe Perches net_dbg_ratelimited("UDPLITE6: partial coverage %d while full coverage %d requested\n", 674db8dac20SDavid S. Miller UDP_SKB_CB(skb)->cscov, skb->len); 675db8dac20SDavid S. Miller goto drop; 676db8dac20SDavid S. Miller } 677db8dac20SDavid S. Miller if (UDP_SKB_CB(skb)->cscov < up->pcrlen) { 678ba7a46f1SJoe Perches net_dbg_ratelimited("UDPLITE6: coverage %d too small, need min %d\n", 679db8dac20SDavid S. Miller UDP_SKB_CB(skb)->cscov, up->pcrlen); 680db8dac20SDavid S. Miller goto drop; 681db8dac20SDavid S. Miller } 682db8dac20SDavid S. Miller } 683db8dac20SDavid S. Miller 6844b943faeSPaolo Abeni prefetch(&sk->sk_rmem_alloc); 685ce25d66aSEric Dumazet if (rcu_access_pointer(sk->sk_filter) && 686ce25d66aSEric Dumazet udp_lib_checksum_complete(skb)) 6876a5dc9e5SEric Dumazet goto csum_error; 688ce25d66aSEric Dumazet 689ba66bbe5SDaniel Borkmann if (sk_filter_trim_cap(sk, skb, sizeof(struct udphdr))) 690a6127697SMichal Kubeček goto drop; 691db8dac20SDavid S. Miller 692e6afc8acSsamanthakumar udp_csum_pull_header(skb); 693cb80ef46SBenjamin LaHaise 694d826eb14SEric Dumazet skb_dst_drop(skb); 695db8dac20SDavid S. Miller 696850cbaddSPaolo Abeni return __udpv6_queue_rcv_skb(sk, skb); 6973e215c8dSJames M Leddy 6986a5dc9e5SEric Dumazet csum_error: 69902c22347SEric Dumazet __UDP6_INC_STATS(sock_net(sk), UDP_MIB_CSUMERRORS, is_udplite); 700db8dac20SDavid S. Miller drop: 70102c22347SEric Dumazet __UDP6_INC_STATS(sock_net(sk), UDP_MIB_INERRORS, is_udplite); 702cb80ef46SBenjamin LaHaise atomic_inc(&sk->sk_drops); 703db8dac20SDavid S. Miller kfree_skb(skb); 704db8dac20SDavid S. Miller return -1; 705db8dac20SDavid S. Miller } 706db8dac20SDavid S. Miller 707cf329aa4SPaolo Abeni static int udpv6_queue_rcv_skb(struct sock *sk, struct sk_buff *skb) 708cf329aa4SPaolo Abeni { 709cf329aa4SPaolo Abeni struct sk_buff *next, *segs; 710cf329aa4SPaolo Abeni int ret; 711cf329aa4SPaolo Abeni 712cf329aa4SPaolo Abeni if (likely(!udp_unexpected_gso(sk, skb))) 713cf329aa4SPaolo Abeni return udpv6_queue_rcv_one_skb(sk, skb); 714cf329aa4SPaolo Abeni 715cf329aa4SPaolo Abeni __skb_push(skb, -skb_mac_offset(skb)); 716cf329aa4SPaolo Abeni segs = udp_rcv_segment(sk, skb, false); 717cf329aa4SPaolo Abeni for (skb = segs; skb; skb = next) { 718cf329aa4SPaolo Abeni next = skb->next; 719cf329aa4SPaolo Abeni __skb_pull(skb, skb_transport_offset(skb)); 720cf329aa4SPaolo Abeni 721cf329aa4SPaolo Abeni ret = udpv6_queue_rcv_one_skb(sk, skb); 722cf329aa4SPaolo Abeni if (ret > 0) 723cf329aa4SPaolo Abeni ip6_protocol_deliver_rcu(dev_net(skb->dev), skb, ret, 724cf329aa4SPaolo Abeni true); 725cf329aa4SPaolo Abeni } 726cf329aa4SPaolo Abeni return 0; 727cf329aa4SPaolo Abeni } 728cf329aa4SPaolo Abeni 7295cf3d461SDavid Held static bool __udp_v6_is_mcast_sock(struct net *net, struct sock *sk, 730b71d1d42SEric Dumazet __be16 loc_port, const struct in6_addr *loc_addr, 731b71d1d42SEric Dumazet __be16 rmt_port, const struct in6_addr *rmt_addr, 7327bd2db40SDewi Morgan int dif, int sdif, unsigned short hnum) 733db8dac20SDavid S. Miller { 7349e89fd8bSSven Wegener struct inet_sock *inet = inet_sk(sk); 735db8dac20SDavid S. Miller 7369e89fd8bSSven Wegener if (!net_eq(sock_net(sk), net)) 7375cf3d461SDavid Held return false; 738b8ad0cbcSDaniel Lezcano 7395cf3d461SDavid Held if (udp_sk(sk)->udp_port_hash != hnum || 7405cf3d461SDavid Held sk->sk_family != PF_INET6 || 7415cf3d461SDavid Held (inet->inet_dport && inet->inet_dport != rmt_port) || 7425cf3d461SDavid Held (!ipv6_addr_any(&sk->sk_v6_daddr) && 7435cf3d461SDavid Held !ipv6_addr_equal(&sk->sk_v6_daddr, rmt_addr)) || 7447bd2db40SDewi Morgan !udp_sk_bound_dev_eq(net, sk->sk_bound_dev_if, dif, sdif) || 74533b4b015SHenning Rogge (!ipv6_addr_any(&sk->sk_v6_rcv_saddr) && 74633b4b015SHenning Rogge !ipv6_addr_equal(&sk->sk_v6_rcv_saddr, loc_addr))) 7475cf3d461SDavid Held return false; 7489e89fd8bSSven Wegener if (!inet6_mc_check(sk, loc_addr, rmt_addr)) 7495cf3d461SDavid Held return false; 7505cf3d461SDavid Held return true; 751db8dac20SDavid S. Miller } 752db8dac20SDavid S. Miller 7534068579eSTom Herbert static void udp6_csum_zero_error(struct sk_buff *skb) 7544068579eSTom Herbert { 7554068579eSTom Herbert /* RFC 2460 section 8.1 says that we SHOULD log 7564068579eSTom Herbert * this error. Well, it is reasonable. 7574068579eSTom Herbert */ 758ba7a46f1SJoe Perches net_dbg_ratelimited("IPv6: udp checksum is 0 for [%pI6c]:%u->[%pI6c]:%u\n", 7594068579eSTom Herbert &ipv6_hdr(skb)->saddr, ntohs(udp_hdr(skb)->source), 7604068579eSTom Herbert &ipv6_hdr(skb)->daddr, ntohs(udp_hdr(skb)->dest)); 7614068579eSTom Herbert } 7624068579eSTom Herbert 763db8dac20SDavid S. Miller /* 764db8dac20SDavid S. Miller * Note: called only from the BH handler context, 765db8dac20SDavid S. Miller * so we don't need to lock the hashes. 766db8dac20SDavid S. Miller */ 767e3163493SPavel Emelyanov static int __udp6_lib_mcast_deliver(struct net *net, struct sk_buff *skb, 768b71d1d42SEric Dumazet const struct in6_addr *saddr, const struct in6_addr *daddr, 76936cbb245SRick Jones struct udp_table *udptable, int proto) 770db8dac20SDavid S. Miller { 771ca065d0cSEric Dumazet struct sock *sk, *first = NULL; 772db8dac20SDavid S. Miller const struct udphdr *uh = udp_hdr(skb); 7735cf3d461SDavid Held unsigned short hnum = ntohs(uh->dest); 7745cf3d461SDavid Held struct udp_hslot *hslot = udp_hashslot(udptable, net, hnum); 775ca065d0cSEric Dumazet unsigned int offset = offsetof(typeof(*sk), sk_node); 7762dc41cffSDavid Held unsigned int hash2 = 0, hash2_any = 0, use_hash2 = (hslot->count > 10); 777ca065d0cSEric Dumazet int dif = inet6_iif(skb); 7787bd2db40SDewi Morgan int sdif = inet6_sdif(skb); 779ca065d0cSEric Dumazet struct hlist_node *node; 780ca065d0cSEric Dumazet struct sk_buff *nskb; 7812dc41cffSDavid Held 7822dc41cffSDavid Held if (use_hash2) { 783f0b1e64cSMartin KaFai Lau hash2_any = ipv6_portaddr_hash(net, &in6addr_any, hnum) & 78473e2d5e3SPablo Neira udptable->mask; 785f0b1e64cSMartin KaFai Lau hash2 = ipv6_portaddr_hash(net, daddr, hnum) & udptable->mask; 7862dc41cffSDavid Held start_lookup: 78773e2d5e3SPablo Neira hslot = &udptable->hash2[hash2]; 7882dc41cffSDavid Held offset = offsetof(typeof(*sk), __sk_common.skc_portaddr_node); 7892dc41cffSDavid Held } 790db8dac20SDavid S. Miller 791ca065d0cSEric Dumazet sk_for_each_entry_offset_rcu(sk, node, &hslot->head, offset) { 792ca065d0cSEric Dumazet if (!__udp_v6_is_mcast_sock(net, sk, uh->dest, daddr, 7937bd2db40SDewi Morgan uh->source, saddr, dif, sdif, 7947bd2db40SDewi Morgan hnum)) 795ca065d0cSEric Dumazet continue; 7961c19448cSTom Herbert /* If zero checksum and no_check is not on for 7974068579eSTom Herbert * the socket then skip it. 7984068579eSTom Herbert */ 799ca065d0cSEric Dumazet if (!uh->check && !udp_sk(sk)->no_check6_rx) 800ca065d0cSEric Dumazet continue; 801ca065d0cSEric Dumazet if (!first) { 802ca065d0cSEric Dumazet first = sk; 803ca065d0cSEric Dumazet continue; 804db8dac20SDavid S. Miller } 805ca065d0cSEric Dumazet nskb = skb_clone(skb, GFP_ATOMIC); 806ca065d0cSEric Dumazet if (unlikely(!nskb)) { 807ca065d0cSEric Dumazet atomic_inc(&sk->sk_drops); 80802c22347SEric Dumazet __UDP6_INC_STATS(net, UDP_MIB_RCVBUFERRORS, 809ca065d0cSEric Dumazet IS_UDPLITE(sk)); 81002c22347SEric Dumazet __UDP6_INC_STATS(net, UDP_MIB_INERRORS, 811ca065d0cSEric Dumazet IS_UDPLITE(sk)); 812ca065d0cSEric Dumazet continue; 813a1ab77f9SEric Dumazet } 814db8dac20SDavid S. Miller 815ca065d0cSEric Dumazet if (udpv6_queue_rcv_skb(sk, nskb) > 0) 816ca065d0cSEric Dumazet consume_skb(nskb); 817ca065d0cSEric Dumazet } 818a1ab77f9SEric Dumazet 8192dc41cffSDavid Held /* Also lookup *:port if we are using hash2 and haven't done so yet. */ 8202dc41cffSDavid Held if (use_hash2 && hash2 != hash2_any) { 8212dc41cffSDavid Held hash2 = hash2_any; 8222dc41cffSDavid Held goto start_lookup; 8232dc41cffSDavid Held } 8242dc41cffSDavid Held 825ca065d0cSEric Dumazet if (first) { 826ca065d0cSEric Dumazet if (udpv6_queue_rcv_skb(first, skb) > 0) 827ca065d0cSEric Dumazet consume_skb(skb); 828a1ab77f9SEric Dumazet } else { 829ca065d0cSEric Dumazet kfree_skb(skb); 83002c22347SEric Dumazet __UDP6_INC_STATS(net, UDP_MIB_IGNOREDMULTI, 83136cbb245SRick Jones proto == IPPROTO_UDPLITE); 832a1ab77f9SEric Dumazet } 833db8dac20SDavid S. Miller return 0; 834db8dac20SDavid S. Miller } 835db8dac20SDavid S. Miller 83664f0f5d1SPaolo Abeni static void udp6_sk_rx_dst_set(struct sock *sk, struct dst_entry *dst) 83764f0f5d1SPaolo Abeni { 83864f0f5d1SPaolo Abeni if (udp_sk_rx_dst_set(sk, dst)) { 83964f0f5d1SPaolo Abeni const struct rt6_info *rt = (const struct rt6_info *)dst; 84064f0f5d1SPaolo Abeni 84164f0f5d1SPaolo Abeni inet6_sk(sk)->rx_dst_cookie = rt6_get_cookie(rt); 84264f0f5d1SPaolo Abeni } 84364f0f5d1SPaolo Abeni } 84464f0f5d1SPaolo Abeni 845eb63f296SPaolo Abeni /* wrapper for udp_queue_rcv_skb tacking care of csum conversion and 846eb63f296SPaolo Abeni * return code conversion for ip layer consumption 847eb63f296SPaolo Abeni */ 848eb63f296SPaolo Abeni static int udp6_unicast_rcv_skb(struct sock *sk, struct sk_buff *skb, 849eb63f296SPaolo Abeni struct udphdr *uh) 850eb63f296SPaolo Abeni { 851eb63f296SPaolo Abeni int ret; 852eb63f296SPaolo Abeni 853eb63f296SPaolo Abeni if (inet_get_convert_csum(sk) && uh->check && !IS_UDPLITE(sk)) 854eb63f296SPaolo Abeni skb_checksum_try_convert(skb, IPPROTO_UDP, uh->check, 855eb63f296SPaolo Abeni ip6_compute_pseudo); 856eb63f296SPaolo Abeni 857eb63f296SPaolo Abeni ret = udpv6_queue_rcv_skb(sk, skb); 858eb63f296SPaolo Abeni 85984dad559SPaolo Abeni /* a return value > 0 means to resubmit the input */ 860eb63f296SPaolo Abeni if (ret > 0) 86184dad559SPaolo Abeni return ret; 862eb63f296SPaolo Abeni return 0; 863eb63f296SPaolo Abeni } 864eb63f296SPaolo Abeni 865645ca708SEric Dumazet int __udp6_lib_rcv(struct sk_buff *skb, struct udp_table *udptable, 866db8dac20SDavid S. Miller int proto) 867db8dac20SDavid S. Miller { 868b71d1d42SEric Dumazet const struct in6_addr *saddr, *daddr; 869ca065d0cSEric Dumazet struct net *net = dev_net(skb->dev); 870ca065d0cSEric Dumazet struct udphdr *uh; 871ca065d0cSEric Dumazet struct sock *sk; 872db8dac20SDavid S. Miller u32 ulen = 0; 873db8dac20SDavid S. Miller 874db8dac20SDavid S. Miller if (!pskb_may_pull(skb, sizeof(struct udphdr))) 875d6bc0149SBjørn Mork goto discard; 876db8dac20SDavid S. Miller 877db8dac20SDavid S. Miller saddr = &ipv6_hdr(skb)->saddr; 878db8dac20SDavid S. Miller daddr = &ipv6_hdr(skb)->daddr; 879db8dac20SDavid S. Miller uh = udp_hdr(skb); 880db8dac20SDavid S. Miller 881db8dac20SDavid S. Miller ulen = ntohs(uh->len); 882db8dac20SDavid S. Miller if (ulen > skb->len) 883db8dac20SDavid S. Miller goto short_packet; 884db8dac20SDavid S. Miller 885db8dac20SDavid S. Miller if (proto == IPPROTO_UDP) { 886db8dac20SDavid S. Miller /* UDP validates ulen. */ 887db8dac20SDavid S. Miller 888db8dac20SDavid S. Miller /* Check for jumbo payload */ 889db8dac20SDavid S. Miller if (ulen == 0) 890db8dac20SDavid S. Miller ulen = skb->len; 891db8dac20SDavid S. Miller 892db8dac20SDavid S. Miller if (ulen < sizeof(*uh)) 893db8dac20SDavid S. Miller goto short_packet; 894db8dac20SDavid S. Miller 895db8dac20SDavid S. Miller if (ulen < skb->len) { 896db8dac20SDavid S. Miller if (pskb_trim_rcsum(skb, ulen)) 897db8dac20SDavid S. Miller goto short_packet; 898db8dac20SDavid S. Miller saddr = &ipv6_hdr(skb)->saddr; 899db8dac20SDavid S. Miller daddr = &ipv6_hdr(skb)->daddr; 900db8dac20SDavid S. Miller uh = udp_hdr(skb); 901db8dac20SDavid S. Miller } 902db8dac20SDavid S. Miller } 903db8dac20SDavid S. Miller 904db8dac20SDavid S. Miller if (udp6_csum_init(skb, uh, proto)) 9056a5dc9e5SEric Dumazet goto csum_error; 906db8dac20SDavid S. Miller 907c9f2c1aeSPaolo Abeni /* Check if the socket is already available, e.g. due to early demux */ 908c9f2c1aeSPaolo Abeni sk = skb_steal_sock(skb); 909c9f2c1aeSPaolo Abeni if (sk) { 910c9f2c1aeSPaolo Abeni struct dst_entry *dst = skb_dst(skb); 911c9f2c1aeSPaolo Abeni int ret; 912c9f2c1aeSPaolo Abeni 913c9f2c1aeSPaolo Abeni if (unlikely(sk->sk_rx_dst != dst)) 91464f0f5d1SPaolo Abeni udp6_sk_rx_dst_set(sk, dst); 915c9f2c1aeSPaolo Abeni 916eb63f296SPaolo Abeni if (!uh->check && !udp_sk(sk)->no_check6_rx) { 917c9f2c1aeSPaolo Abeni sock_put(sk); 918eb63f296SPaolo Abeni goto report_csum_error; 919eb63f296SPaolo Abeni } 920c9f2c1aeSPaolo Abeni 921eb63f296SPaolo Abeni ret = udp6_unicast_rcv_skb(sk, skb, uh); 922eb63f296SPaolo Abeni sock_put(sk); 923c9f2c1aeSPaolo Abeni return ret; 924c9f2c1aeSPaolo Abeni } 925c9f2c1aeSPaolo Abeni 926db8dac20SDavid S. Miller /* 927db8dac20SDavid S. Miller * Multicast receive code 928db8dac20SDavid S. Miller */ 929db8dac20SDavid S. Miller if (ipv6_addr_is_multicast(daddr)) 930e3163493SPavel Emelyanov return __udp6_lib_mcast_deliver(net, skb, 93136cbb245SRick Jones saddr, daddr, udptable, proto); 932db8dac20SDavid S. Miller 933db8dac20SDavid S. Miller /* Unicast */ 934607c4aafSKOVACS Krisztian sk = __udp6_lib_lookup_skb(skb, uh->source, uh->dest, udptable); 93553b24b8fSIan Morris if (sk) { 936eb63f296SPaolo Abeni if (!uh->check && !udp_sk(sk)->no_check6_rx) 937eb63f296SPaolo Abeni goto report_csum_error; 938eb63f296SPaolo Abeni return udp6_unicast_rcv_skb(sk, skb, uh); 9394068579eSTom Herbert } 9404068579eSTom Herbert 941eb63f296SPaolo Abeni if (!uh->check) 942eb63f296SPaolo Abeni goto report_csum_error; 9434068579eSTom Herbert 944db8dac20SDavid S. Miller if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) 945db8dac20SDavid S. Miller goto discard; 946db8dac20SDavid S. Miller 947db8dac20SDavid S. Miller if (udp_lib_checksum_complete(skb)) 9486a5dc9e5SEric Dumazet goto csum_error; 949db8dac20SDavid S. Miller 95002c22347SEric Dumazet __UDP6_INC_STATS(net, UDP_MIB_NOPORTS, proto == IPPROTO_UDPLITE); 9513ffe533cSAlexey Dobriyan icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0); 952db8dac20SDavid S. Miller 953db8dac20SDavid S. Miller kfree_skb(skb); 954db8dac20SDavid S. Miller return 0; 955db8dac20SDavid S. Miller 956db8dac20SDavid S. Miller short_packet: 957ba7a46f1SJoe Perches net_dbg_ratelimited("UDP%sv6: short packet: From [%pI6c]:%u %d/%d to [%pI6c]:%u\n", 958db8dac20SDavid S. Miller proto == IPPROTO_UDPLITE ? "-Lite" : "", 959ba7a46f1SJoe Perches saddr, ntohs(uh->source), 960ba7a46f1SJoe Perches ulen, skb->len, 961ba7a46f1SJoe Perches daddr, ntohs(uh->dest)); 9626a5dc9e5SEric Dumazet goto discard; 963eb63f296SPaolo Abeni 964eb63f296SPaolo Abeni report_csum_error: 965eb63f296SPaolo Abeni udp6_csum_zero_error(skb); 9666a5dc9e5SEric Dumazet csum_error: 96702c22347SEric Dumazet __UDP6_INC_STATS(net, UDP_MIB_CSUMERRORS, proto == IPPROTO_UDPLITE); 968db8dac20SDavid S. Miller discard: 96902c22347SEric Dumazet __UDP6_INC_STATS(net, UDP_MIB_INERRORS, proto == IPPROTO_UDPLITE); 970db8dac20SDavid S. Miller kfree_skb(skb); 971db8dac20SDavid S. Miller return 0; 972db8dac20SDavid S. Miller } 973db8dac20SDavid S. Miller 9740bd84065Ssubashab@codeaurora.org 9755425077dSsubashab@codeaurora.org static struct sock *__udp6_lib_demux_lookup(struct net *net, 9765425077dSsubashab@codeaurora.org __be16 loc_port, const struct in6_addr *loc_addr, 9775425077dSsubashab@codeaurora.org __be16 rmt_port, const struct in6_addr *rmt_addr, 9784297a0efSDavid Ahern int dif, int sdif) 9795425077dSsubashab@codeaurora.org { 9800bd84065Ssubashab@codeaurora.org unsigned short hnum = ntohs(loc_port); 981f0b1e64cSMartin KaFai Lau unsigned int hash2 = ipv6_portaddr_hash(net, loc_addr, hnum); 9820bd84065Ssubashab@codeaurora.org unsigned int slot2 = hash2 & udp_table.mask; 9830bd84065Ssubashab@codeaurora.org struct udp_hslot *hslot2 = &udp_table.hash2[slot2]; 9840bd84065Ssubashab@codeaurora.org const __portpair ports = INET_COMBINED_PORTS(rmt_port, hnum); 9855425077dSsubashab@codeaurora.org struct sock *sk; 9865425077dSsubashab@codeaurora.org 9870bd84065Ssubashab@codeaurora.org udp_portaddr_for_each_entry_rcu(sk, &hslot2->head) { 98885cb73ffSWei Wang if (sk->sk_state == TCP_ESTABLISHED && 9894297a0efSDavid Ahern INET6_MATCH(sk, net, rmt_addr, loc_addr, ports, dif, sdif)) 9905425077dSsubashab@codeaurora.org return sk; 9910bd84065Ssubashab@codeaurora.org /* Only check first socket in chain */ 9920bd84065Ssubashab@codeaurora.org break; 9930bd84065Ssubashab@codeaurora.org } 9940bd84065Ssubashab@codeaurora.org return NULL; 9955425077dSsubashab@codeaurora.org } 9965425077dSsubashab@codeaurora.org 9975425077dSsubashab@codeaurora.org static void udp_v6_early_demux(struct sk_buff *skb) 9985425077dSsubashab@codeaurora.org { 9995425077dSsubashab@codeaurora.org struct net *net = dev_net(skb->dev); 10005425077dSsubashab@codeaurora.org const struct udphdr *uh; 10015425077dSsubashab@codeaurora.org struct sock *sk; 10025425077dSsubashab@codeaurora.org struct dst_entry *dst; 10035425077dSsubashab@codeaurora.org int dif = skb->dev->ifindex; 10044297a0efSDavid Ahern int sdif = inet6_sdif(skb); 10055425077dSsubashab@codeaurora.org 10065425077dSsubashab@codeaurora.org if (!pskb_may_pull(skb, skb_transport_offset(skb) + 10075425077dSsubashab@codeaurora.org sizeof(struct udphdr))) 10085425077dSsubashab@codeaurora.org return; 10095425077dSsubashab@codeaurora.org 10105425077dSsubashab@codeaurora.org uh = udp_hdr(skb); 10115425077dSsubashab@codeaurora.org 10125425077dSsubashab@codeaurora.org if (skb->pkt_type == PACKET_HOST) 10135425077dSsubashab@codeaurora.org sk = __udp6_lib_demux_lookup(net, uh->dest, 10145425077dSsubashab@codeaurora.org &ipv6_hdr(skb)->daddr, 10155425077dSsubashab@codeaurora.org uh->source, &ipv6_hdr(skb)->saddr, 10164297a0efSDavid Ahern dif, sdif); 10175425077dSsubashab@codeaurora.org else 10185425077dSsubashab@codeaurora.org return; 10195425077dSsubashab@codeaurora.org 102041c6d650SReshetova, Elena if (!sk || !refcount_inc_not_zero(&sk->sk_refcnt)) 10215425077dSsubashab@codeaurora.org return; 10225425077dSsubashab@codeaurora.org 10235425077dSsubashab@codeaurora.org skb->sk = sk; 10245425077dSsubashab@codeaurora.org skb->destructor = sock_efree; 10255425077dSsubashab@codeaurora.org dst = READ_ONCE(sk->sk_rx_dst); 10265425077dSsubashab@codeaurora.org 10275425077dSsubashab@codeaurora.org if (dst) 10285425077dSsubashab@codeaurora.org dst = dst_check(dst, inet6_sk(sk)->rx_dst_cookie); 10295425077dSsubashab@codeaurora.org if (dst) { 1030d24406c8SWei Wang /* set noref for now. 1031d24406c8SWei Wang * any place which wants to hold dst has to call 1032d24406c8SWei Wang * dst_hold_safe() 1033d24406c8SWei Wang */ 10345425077dSsubashab@codeaurora.org skb_dst_set_noref(skb, dst); 10355425077dSsubashab@codeaurora.org } 10365425077dSsubashab@codeaurora.org } 10375425077dSsubashab@codeaurora.org 1038db8dac20SDavid S. Miller static __inline__ int udpv6_rcv(struct sk_buff *skb) 1039db8dac20SDavid S. Miller { 1040645ca708SEric Dumazet return __udp6_lib_rcv(skb, &udp_table, IPPROTO_UDP); 1041db8dac20SDavid S. Miller } 1042db8dac20SDavid S. Miller 1043db8dac20SDavid S. Miller /* 1044db8dac20SDavid S. Miller * Throw away all pending data and cancel the corking. Socket is locked. 1045db8dac20SDavid S. Miller */ 1046db8dac20SDavid S. Miller static void udp_v6_flush_pending_frames(struct sock *sk) 1047db8dac20SDavid S. Miller { 1048db8dac20SDavid S. Miller struct udp_sock *up = udp_sk(sk); 1049db8dac20SDavid S. Miller 105036d926b9SDenis V. Lunev if (up->pending == AF_INET) 105136d926b9SDenis V. Lunev udp_flush_pending_frames(sk); 105236d926b9SDenis V. Lunev else if (up->pending) { 1053db8dac20SDavid S. Miller up->len = 0; 1054db8dac20SDavid S. Miller up->pending = 0; 1055db8dac20SDavid S. Miller ip6_flush_pending_frames(sk); 1056db8dac20SDavid S. Miller } 1057db8dac20SDavid S. Miller } 1058db8dac20SDavid S. Miller 1059d74bad4eSAndrey Ignatov static int udpv6_pre_connect(struct sock *sk, struct sockaddr *uaddr, 1060d74bad4eSAndrey Ignatov int addr_len) 1061d74bad4eSAndrey Ignatov { 1062d74bad4eSAndrey Ignatov /* The following checks are replicated from __ip6_datagram_connect() 1063d74bad4eSAndrey Ignatov * and intended to prevent BPF program called below from accessing 1064d74bad4eSAndrey Ignatov * bytes that are out of the bound specified by user in addr_len. 1065d74bad4eSAndrey Ignatov */ 1066d74bad4eSAndrey Ignatov if (uaddr->sa_family == AF_INET) { 1067d74bad4eSAndrey Ignatov if (__ipv6_only_sock(sk)) 1068d74bad4eSAndrey Ignatov return -EAFNOSUPPORT; 1069d74bad4eSAndrey Ignatov return udp_pre_connect(sk, uaddr, addr_len); 1070d74bad4eSAndrey Ignatov } 1071d74bad4eSAndrey Ignatov 1072d74bad4eSAndrey Ignatov if (addr_len < SIN6_LEN_RFC2133) 1073d74bad4eSAndrey Ignatov return -EINVAL; 1074d74bad4eSAndrey Ignatov 1075d74bad4eSAndrey Ignatov return BPF_CGROUP_RUN_PROG_INET6_CONNECT_LOCK(sk, uaddr); 1076d74bad4eSAndrey Ignatov } 1077d74bad4eSAndrey Ignatov 1078493c6be3SSridhar Samudrala /** 1079493c6be3SSridhar Samudrala * udp6_hwcsum_outgoing - handle outgoing HW checksumming 1080493c6be3SSridhar Samudrala * @sk: socket we are sending on 1081493c6be3SSridhar Samudrala * @skb: sk_buff containing the filled-in UDP header 1082493c6be3SSridhar Samudrala * (checksum field must be zeroed out) 1083493c6be3SSridhar Samudrala */ 1084493c6be3SSridhar Samudrala static void udp6_hwcsum_outgoing(struct sock *sk, struct sk_buff *skb, 1085493c6be3SSridhar Samudrala const struct in6_addr *saddr, 1086493c6be3SSridhar Samudrala const struct in6_addr *daddr, int len) 1087493c6be3SSridhar Samudrala { 1088493c6be3SSridhar Samudrala unsigned int offset; 1089493c6be3SSridhar Samudrala struct udphdr *uh = udp_hdr(skb); 1090d39d938cSVlad Yasevich struct sk_buff *frags = skb_shinfo(skb)->frag_list; 1091493c6be3SSridhar Samudrala __wsum csum = 0; 1092493c6be3SSridhar Samudrala 1093d39d938cSVlad Yasevich if (!frags) { 1094493c6be3SSridhar Samudrala /* Only one fragment on the socket. */ 1095493c6be3SSridhar Samudrala skb->csum_start = skb_transport_header(skb) - skb->head; 1096493c6be3SSridhar Samudrala skb->csum_offset = offsetof(struct udphdr, check); 1097493c6be3SSridhar Samudrala uh->check = ~csum_ipv6_magic(saddr, daddr, len, IPPROTO_UDP, 0); 1098493c6be3SSridhar Samudrala } else { 1099493c6be3SSridhar Samudrala /* 1100493c6be3SSridhar Samudrala * HW-checksum won't work as there are two or more 1101493c6be3SSridhar Samudrala * fragments on the socket so that all csums of sk_buffs 1102493c6be3SSridhar Samudrala * should be together 1103493c6be3SSridhar Samudrala */ 1104493c6be3SSridhar Samudrala offset = skb_transport_offset(skb); 1105493c6be3SSridhar Samudrala skb->csum = skb_checksum(skb, offset, skb->len - offset, 0); 110663ecc3d9SSubash Abhinov Kasiviswanathan csum = skb->csum; 1107493c6be3SSridhar Samudrala 1108493c6be3SSridhar Samudrala skb->ip_summed = CHECKSUM_NONE; 1109493c6be3SSridhar Samudrala 1110d39d938cSVlad Yasevich do { 1111d39d938cSVlad Yasevich csum = csum_add(csum, frags->csum); 1112d39d938cSVlad Yasevich } while ((frags = frags->next)); 1113493c6be3SSridhar Samudrala 1114493c6be3SSridhar Samudrala uh->check = csum_ipv6_magic(saddr, daddr, len, IPPROTO_UDP, 1115493c6be3SSridhar Samudrala csum); 1116493c6be3SSridhar Samudrala if (uh->check == 0) 1117493c6be3SSridhar Samudrala uh->check = CSUM_MANGLED_0; 1118493c6be3SSridhar Samudrala } 1119493c6be3SSridhar Samudrala } 1120493c6be3SSridhar Samudrala 1121db8dac20SDavid S. Miller /* 1122db8dac20SDavid S. Miller * Sending 1123db8dac20SDavid S. Miller */ 1124db8dac20SDavid S. Miller 1125bec1f6f6SWillem de Bruijn static int udp_v6_send_skb(struct sk_buff *skb, struct flowi6 *fl6, 1126bec1f6f6SWillem de Bruijn struct inet_cork *cork) 1127db8dac20SDavid S. Miller { 1128d39d938cSVlad Yasevich struct sock *sk = skb->sk; 1129db8dac20SDavid S. Miller struct udphdr *uh; 1130db8dac20SDavid S. Miller int err = 0; 1131db8dac20SDavid S. Miller int is_udplite = IS_UDPLITE(sk); 1132db8dac20SDavid S. Miller __wsum csum = 0; 1133d39d938cSVlad Yasevich int offset = skb_transport_offset(skb); 1134d39d938cSVlad Yasevich int len = skb->len - offset; 1135db8dac20SDavid S. Miller 1136db8dac20SDavid S. Miller /* 1137db8dac20SDavid S. Miller * Create a UDP header 1138db8dac20SDavid S. Miller */ 1139db8dac20SDavid S. Miller uh = udp_hdr(skb); 11401958b856SDavid S. Miller uh->source = fl6->fl6_sport; 11411958b856SDavid S. Miller uh->dest = fl6->fl6_dport; 1142d39d938cSVlad Yasevich uh->len = htons(len); 1143db8dac20SDavid S. Miller uh->check = 0; 1144db8dac20SDavid S. Miller 1145bec1f6f6SWillem de Bruijn if (cork->gso_size) { 1146bec1f6f6SWillem de Bruijn const int hlen = skb_network_header_len(skb) + 1147bec1f6f6SWillem de Bruijn sizeof(struct udphdr); 1148bec1f6f6SWillem de Bruijn 1149bec1f6f6SWillem de Bruijn if (hlen + cork->gso_size > cork->fragsize) 1150bec1f6f6SWillem de Bruijn return -EINVAL; 1151bec1f6f6SWillem de Bruijn if (skb->len > cork->gso_size * UDP_MAX_SEGMENTS) 1152bec1f6f6SWillem de Bruijn return -EINVAL; 1153a8c744a8SWillem de Bruijn if (udp_sk(sk)->no_check6_tx) 1154a8c744a8SWillem de Bruijn return -EINVAL; 1155ff06342cSWillem de Bruijn if (skb->ip_summed != CHECKSUM_PARTIAL || is_udplite || 1156ff06342cSWillem de Bruijn dst_xfrm(skb_dst(skb))) 1157bec1f6f6SWillem de Bruijn return -EIO; 1158bec1f6f6SWillem de Bruijn 1159bec1f6f6SWillem de Bruijn skb_shinfo(skb)->gso_size = cork->gso_size; 1160bec1f6f6SWillem de Bruijn skb_shinfo(skb)->gso_type = SKB_GSO_UDP_L4; 1161a8c744a8SWillem de Bruijn goto csum_partial; 1162bec1f6f6SWillem de Bruijn } 1163bec1f6f6SWillem de Bruijn 1164db8dac20SDavid S. Miller if (is_udplite) 1165d39d938cSVlad Yasevich csum = udplite_csum(skb); 1166d39d938cSVlad Yasevich else if (udp_sk(sk)->no_check6_tx) { /* UDP csum disabled */ 11674068579eSTom Herbert skb->ip_summed = CHECKSUM_NONE; 11684068579eSTom Herbert goto send; 11694068579eSTom Herbert } else if (skb->ip_summed == CHECKSUM_PARTIAL) { /* UDP hardware csum */ 1170a8c744a8SWillem de Bruijn csum_partial: 1171d39d938cSVlad Yasevich udp6_hwcsum_outgoing(sk, skb, &fl6->saddr, &fl6->daddr, len); 1172493c6be3SSridhar Samudrala goto send; 1173493c6be3SSridhar Samudrala } else 1174d39d938cSVlad Yasevich csum = udp_csum(skb); 1175db8dac20SDavid S. Miller 1176db8dac20SDavid S. Miller /* add protocol-dependent pseudo-header */ 11774c9483b2SDavid S. Miller uh->check = csum_ipv6_magic(&fl6->saddr, &fl6->daddr, 1178d39d938cSVlad Yasevich len, fl6->flowi6_proto, csum); 1179db8dac20SDavid S. Miller if (uh->check == 0) 1180db8dac20SDavid S. Miller uh->check = CSUM_MANGLED_0; 1181db8dac20SDavid S. Miller 1182493c6be3SSridhar Samudrala send: 1183d39d938cSVlad Yasevich err = ip6_send_skb(skb); 11846ce9e7b5SEric Dumazet if (err) { 11856ce9e7b5SEric Dumazet if (err == -ENOBUFS && !inet6_sk(sk)->recverr) { 11866aef70a8SEric Dumazet UDP6_INC_STATS(sock_net(sk), 11876ce9e7b5SEric Dumazet UDP_MIB_SNDBUFERRORS, is_udplite); 11886ce9e7b5SEric Dumazet err = 0; 11896ce9e7b5SEric Dumazet } 11906aef70a8SEric Dumazet } else { 11916aef70a8SEric Dumazet UDP6_INC_STATS(sock_net(sk), 11926ce9e7b5SEric Dumazet UDP_MIB_OUTDATAGRAMS, is_udplite); 11936aef70a8SEric Dumazet } 1194d39d938cSVlad Yasevich return err; 1195d39d938cSVlad Yasevich } 1196d39d938cSVlad Yasevich 1197d39d938cSVlad Yasevich static int udp_v6_push_pending_frames(struct sock *sk) 1198d39d938cSVlad Yasevich { 1199d39d938cSVlad Yasevich struct sk_buff *skb; 1200d39d938cSVlad Yasevich struct udp_sock *up = udp_sk(sk); 1201d39d938cSVlad Yasevich struct flowi6 fl6; 1202d39d938cSVlad Yasevich int err = 0; 1203d39d938cSVlad Yasevich 1204d39d938cSVlad Yasevich if (up->pending == AF_INET) 1205d39d938cSVlad Yasevich return udp_push_pending_frames(sk); 1206d39d938cSVlad Yasevich 1207d39d938cSVlad Yasevich /* ip6_finish_skb will release the cork, so make a copy of 1208d39d938cSVlad Yasevich * fl6 here. 1209d39d938cSVlad Yasevich */ 1210d39d938cSVlad Yasevich fl6 = inet_sk(sk)->cork.fl.u.ip6; 1211d39d938cSVlad Yasevich 1212d39d938cSVlad Yasevich skb = ip6_finish_skb(sk); 1213d39d938cSVlad Yasevich if (!skb) 1214d39d938cSVlad Yasevich goto out; 1215d39d938cSVlad Yasevich 1216bec1f6f6SWillem de Bruijn err = udp_v6_send_skb(skb, &fl6, &inet_sk(sk)->cork.base); 1217d39d938cSVlad Yasevich 1218db8dac20SDavid S. Miller out: 1219db8dac20SDavid S. Miller up->len = 0; 1220db8dac20SDavid S. Miller up->pending = 0; 1221db8dac20SDavid S. Miller return err; 1222db8dac20SDavid S. Miller } 1223db8dac20SDavid S. Miller 12241b784140SYing Xue int udpv6_sendmsg(struct sock *sk, struct msghdr *msg, size_t len) 1225db8dac20SDavid S. Miller { 1226db8dac20SDavid S. Miller struct ipv6_txoptions opt_space; 1227db8dac20SDavid S. Miller struct udp_sock *up = udp_sk(sk); 1228db8dac20SDavid S. Miller struct inet_sock *inet = inet_sk(sk); 1229db8dac20SDavid S. Miller struct ipv6_pinfo *np = inet6_sk(sk); 1230342dfc30SSteffen Hurrle DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, msg->msg_name); 123120c59de2SArnaud Ebalard struct in6_addr *daddr, *final_p, final; 1232db8dac20SDavid S. Miller struct ipv6_txoptions *opt = NULL; 123345f6fad8SEric Dumazet struct ipv6_txoptions *opt_to_free = NULL; 1234db8dac20SDavid S. Miller struct ip6_flowlabel *flowlabel = NULL; 12354c9483b2SDavid S. Miller struct flowi6 fl6; 1236db8dac20SDavid S. Miller struct dst_entry *dst; 123726879da5SWei Wang struct ipcm6_cookie ipc6; 1238db8dac20SDavid S. Miller int addr_len = msg->msg_namelen; 12399f542f61SAlexey Kodanev bool connected = false; 1240db8dac20SDavid S. Miller int ulen = len; 1241db8dac20SDavid S. Miller int corkreq = up->corkflag || msg->msg_flags&MSG_MORE; 1242db8dac20SDavid S. Miller int err; 1243db8dac20SDavid S. Miller int is_udplite = IS_UDPLITE(sk); 1244db8dac20SDavid S. Miller int (*getfrag)(void *, char *, int, int, int, struct sk_buff *); 1245db8dac20SDavid S. Miller 1246b515430aSWillem de Bruijn ipcm6_init(&ipc6); 1247bec1f6f6SWillem de Bruijn ipc6.gso_size = up->gso_size; 12485fdaa88dSWillem de Bruijn ipc6.sockc.tsflags = sk->sk_tsflags; 124926879da5SWei Wang 1250db8dac20SDavid S. Miller /* destination address check */ 1251db8dac20SDavid S. Miller if (sin6) { 1252db8dac20SDavid S. Miller if (addr_len < offsetof(struct sockaddr, sa_data)) 1253db8dac20SDavid S. Miller return -EINVAL; 1254db8dac20SDavid S. Miller 1255db8dac20SDavid S. Miller switch (sin6->sin6_family) { 1256db8dac20SDavid S. Miller case AF_INET6: 1257db8dac20SDavid S. Miller if (addr_len < SIN6_LEN_RFC2133) 1258db8dac20SDavid S. Miller return -EINVAL; 1259db8dac20SDavid S. Miller daddr = &sin6->sin6_addr; 1260052d2369SJonathan T. Leighton if (ipv6_addr_any(daddr) && 1261052d2369SJonathan T. Leighton ipv6_addr_v4mapped(&np->saddr)) 1262052d2369SJonathan T. Leighton ipv6_addr_set_v4mapped(htonl(INADDR_LOOPBACK), 1263052d2369SJonathan T. Leighton daddr); 1264db8dac20SDavid S. Miller break; 1265db8dac20SDavid S. Miller case AF_INET: 1266db8dac20SDavid S. Miller goto do_udp_sendmsg; 1267db8dac20SDavid S. Miller case AF_UNSPEC: 1268db8dac20SDavid S. Miller msg->msg_name = sin6 = NULL; 1269db8dac20SDavid S. Miller msg->msg_namelen = addr_len = 0; 1270db8dac20SDavid S. Miller daddr = NULL; 1271db8dac20SDavid S. Miller break; 1272db8dac20SDavid S. Miller default: 1273db8dac20SDavid S. Miller return -EINVAL; 1274db8dac20SDavid S. Miller } 1275db8dac20SDavid S. Miller } else if (!up->pending) { 1276db8dac20SDavid S. Miller if (sk->sk_state != TCP_ESTABLISHED) 1277db8dac20SDavid S. Miller return -EDESTADDRREQ; 1278efe4208fSEric Dumazet daddr = &sk->sk_v6_daddr; 1279db8dac20SDavid S. Miller } else 1280db8dac20SDavid S. Miller daddr = NULL; 1281db8dac20SDavid S. Miller 1282db8dac20SDavid S. Miller if (daddr) { 1283db8dac20SDavid S. Miller if (ipv6_addr_v4mapped(daddr)) { 1284db8dac20SDavid S. Miller struct sockaddr_in sin; 1285db8dac20SDavid S. Miller sin.sin_family = AF_INET; 1286c720c7e8SEric Dumazet sin.sin_port = sin6 ? sin6->sin6_port : inet->inet_dport; 1287db8dac20SDavid S. Miller sin.sin_addr.s_addr = daddr->s6_addr32[3]; 1288db8dac20SDavid S. Miller msg->msg_name = &sin; 1289db8dac20SDavid S. Miller msg->msg_namelen = sizeof(sin); 1290db8dac20SDavid S. Miller do_udp_sendmsg: 1291db8dac20SDavid S. Miller if (__ipv6_only_sock(sk)) 1292db8dac20SDavid S. Miller return -ENETUNREACH; 12931b784140SYing Xue return udp_sendmsg(sk, msg, len); 1294db8dac20SDavid S. Miller } 1295db8dac20SDavid S. Miller } 1296db8dac20SDavid S. Miller 1297db8dac20SDavid S. Miller if (up->pending == AF_INET) 12981b784140SYing Xue return udp_sendmsg(sk, msg, len); 1299db8dac20SDavid S. Miller 1300db8dac20SDavid S. Miller /* Rough check on arithmetic overflow, 1301db8dac20SDavid S. Miller better check is made in ip6_append_data(). 1302db8dac20SDavid S. Miller */ 1303db8dac20SDavid S. Miller if (len > INT_MAX - sizeof(struct udphdr)) 1304db8dac20SDavid S. Miller return -EMSGSIZE; 1305db8dac20SDavid S. Miller 130603485f2aSVlad Yasevich getfrag = is_udplite ? udplite_getfrag : ip_generic_getfrag; 1307db8dac20SDavid S. Miller if (up->pending) { 1308db8dac20SDavid S. Miller /* 1309db8dac20SDavid S. Miller * There are pending frames. 1310db8dac20SDavid S. Miller * The socket lock must be held while it's corked. 1311db8dac20SDavid S. Miller */ 1312db8dac20SDavid S. Miller lock_sock(sk); 1313db8dac20SDavid S. Miller if (likely(up->pending)) { 1314db8dac20SDavid S. Miller if (unlikely(up->pending != AF_INET6)) { 1315db8dac20SDavid S. Miller release_sock(sk); 1316db8dac20SDavid S. Miller return -EAFNOSUPPORT; 1317db8dac20SDavid S. Miller } 1318db8dac20SDavid S. Miller dst = NULL; 1319db8dac20SDavid S. Miller goto do_append_data; 1320db8dac20SDavid S. Miller } 1321db8dac20SDavid S. Miller release_sock(sk); 1322db8dac20SDavid S. Miller } 1323db8dac20SDavid S. Miller ulen += sizeof(struct udphdr); 1324db8dac20SDavid S. Miller 13254c9483b2SDavid S. Miller memset(&fl6, 0, sizeof(fl6)); 1326db8dac20SDavid S. Miller 1327db8dac20SDavid S. Miller if (sin6) { 1328db8dac20SDavid S. Miller if (sin6->sin6_port == 0) 1329db8dac20SDavid S. Miller return -EINVAL; 1330db8dac20SDavid S. Miller 13311958b856SDavid S. Miller fl6.fl6_dport = sin6->sin6_port; 1332db8dac20SDavid S. Miller daddr = &sin6->sin6_addr; 1333db8dac20SDavid S. Miller 1334db8dac20SDavid S. Miller if (np->sndflow) { 13354c9483b2SDavid S. Miller fl6.flowlabel = sin6->sin6_flowinfo&IPV6_FLOWINFO_MASK; 13364c9483b2SDavid S. Miller if (fl6.flowlabel&IPV6_FLOWLABEL_MASK) { 13374c9483b2SDavid S. Miller flowlabel = fl6_sock_lookup(sk, fl6.flowlabel); 133863159f29SIan Morris if (!flowlabel) 1339db8dac20SDavid S. Miller return -EINVAL; 1340db8dac20SDavid S. Miller } 1341db8dac20SDavid S. Miller } 1342db8dac20SDavid S. Miller 1343db8dac20SDavid S. Miller /* 1344db8dac20SDavid S. Miller * Otherwise it will be difficult to maintain 1345db8dac20SDavid S. Miller * sk->sk_dst_cache. 1346db8dac20SDavid S. Miller */ 1347db8dac20SDavid S. Miller if (sk->sk_state == TCP_ESTABLISHED && 1348efe4208fSEric Dumazet ipv6_addr_equal(daddr, &sk->sk_v6_daddr)) 1349efe4208fSEric Dumazet daddr = &sk->sk_v6_daddr; 1350db8dac20SDavid S. Miller 1351db8dac20SDavid S. Miller if (addr_len >= sizeof(struct sockaddr_in6) && 1352db8dac20SDavid S. Miller sin6->sin6_scope_id && 1353842df073SHannes Frederic Sowa __ipv6_addr_needs_scope_id(__ipv6_addr_type(daddr))) 13544c9483b2SDavid S. Miller fl6.flowi6_oif = sin6->sin6_scope_id; 1355db8dac20SDavid S. Miller } else { 1356db8dac20SDavid S. Miller if (sk->sk_state != TCP_ESTABLISHED) 1357db8dac20SDavid S. Miller return -EDESTADDRREQ; 1358db8dac20SDavid S. Miller 13591958b856SDavid S. Miller fl6.fl6_dport = inet->inet_dport; 1360efe4208fSEric Dumazet daddr = &sk->sk_v6_daddr; 13614c9483b2SDavid S. Miller fl6.flowlabel = np->flow_label; 13629f542f61SAlexey Kodanev connected = true; 1363db8dac20SDavid S. Miller } 1364db8dac20SDavid S. Miller 13654c9483b2SDavid S. Miller if (!fl6.flowi6_oif) 13664c9483b2SDavid S. Miller fl6.flowi6_oif = sk->sk_bound_dev_if; 1367db8dac20SDavid S. Miller 13684c9483b2SDavid S. Miller if (!fl6.flowi6_oif) 13694c9483b2SDavid S. Miller fl6.flowi6_oif = np->sticky_pktinfo.ipi6_ifindex; 13709f690db7SYang Hongyang 13714c9483b2SDavid S. Miller fl6.flowi6_mark = sk->sk_mark; 1372e2d118a1SLorenzo Colitti fl6.flowi6_uid = sk->sk_uid; 137351953d5bSBrian Haley 1374db8dac20SDavid S. Miller if (msg->msg_controllen) { 1375db8dac20SDavid S. Miller opt = &opt_space; 1376db8dac20SDavid S. Miller memset(opt, 0, sizeof(struct ipv6_txoptions)); 1377db8dac20SDavid S. Miller opt->tot_len = sizeof(*opt); 137826879da5SWei Wang ipc6.opt = opt; 1379db8dac20SDavid S. Miller 13802e8de857SWillem de Bruijn err = udp_cmsg_send(sk, msg, &ipc6.gso_size); 13812e8de857SWillem de Bruijn if (err > 0) 13822e8de857SWillem de Bruijn err = ip6_datagram_send_ctl(sock_net(sk), sk, msg, &fl6, 13835fdaa88dSWillem de Bruijn &ipc6); 1384db8dac20SDavid S. Miller if (err < 0) { 1385db8dac20SDavid S. Miller fl6_sock_release(flowlabel); 1386db8dac20SDavid S. Miller return err; 1387db8dac20SDavid S. Miller } 13884c9483b2SDavid S. Miller if ((fl6.flowlabel&IPV6_FLOWLABEL_MASK) && !flowlabel) { 13894c9483b2SDavid S. Miller flowlabel = fl6_sock_lookup(sk, fl6.flowlabel); 139063159f29SIan Morris if (!flowlabel) 1391db8dac20SDavid S. Miller return -EINVAL; 1392db8dac20SDavid S. Miller } 1393db8dac20SDavid S. Miller if (!(opt->opt_nflen|opt->opt_flen)) 1394db8dac20SDavid S. Miller opt = NULL; 13959f542f61SAlexey Kodanev connected = false; 1396db8dac20SDavid S. Miller } 139745f6fad8SEric Dumazet if (!opt) { 139845f6fad8SEric Dumazet opt = txopt_get(np); 139945f6fad8SEric Dumazet opt_to_free = opt; 140045f6fad8SEric Dumazet } 1401db8dac20SDavid S. Miller if (flowlabel) 1402db8dac20SDavid S. Miller opt = fl6_merge_options(&opt_space, flowlabel, opt); 1403db8dac20SDavid S. Miller opt = ipv6_fixup_options(&opt_space, opt); 140426879da5SWei Wang ipc6.opt = opt; 1405db8dac20SDavid S. Miller 14064c9483b2SDavid S. Miller fl6.flowi6_proto = sk->sk_protocol; 1407876c7f41SBrian Haley if (!ipv6_addr_any(daddr)) 14084e3fd7a0SAlexey Dobriyan fl6.daddr = *daddr; 1409876c7f41SBrian Haley else 14104c9483b2SDavid S. Miller fl6.daddr.s6_addr[15] = 0x1; /* :: means loopback (BSD'ism) */ 14114c9483b2SDavid S. Miller if (ipv6_addr_any(&fl6.saddr) && !ipv6_addr_any(&np->saddr)) 14124e3fd7a0SAlexey Dobriyan fl6.saddr = np->saddr; 14131958b856SDavid S. Miller fl6.fl6_sport = inet->inet_sport; 1414db8dac20SDavid S. Miller 14151cedee13SAndrey Ignatov if (cgroup_bpf_enabled && !connected) { 14161cedee13SAndrey Ignatov err = BPF_CGROUP_RUN_PROG_UDP6_SENDMSG_LOCK(sk, 14171cedee13SAndrey Ignatov (struct sockaddr *)sin6, &fl6.saddr); 14181cedee13SAndrey Ignatov if (err) 14191cedee13SAndrey Ignatov goto out_no_dst; 14201cedee13SAndrey Ignatov if (sin6) { 14211cedee13SAndrey Ignatov if (ipv6_addr_v4mapped(&sin6->sin6_addr)) { 14221cedee13SAndrey Ignatov /* BPF program rewrote IPv6-only by IPv4-mapped 14231cedee13SAndrey Ignatov * IPv6. It's currently unsupported. 14241cedee13SAndrey Ignatov */ 14251cedee13SAndrey Ignatov err = -ENOTSUPP; 14261cedee13SAndrey Ignatov goto out_no_dst; 14271cedee13SAndrey Ignatov } 14281cedee13SAndrey Ignatov if (sin6->sin6_port == 0) { 14291cedee13SAndrey Ignatov /* BPF program set invalid port. Reject it. */ 14301cedee13SAndrey Ignatov err = -EINVAL; 14311cedee13SAndrey Ignatov goto out_no_dst; 14321cedee13SAndrey Ignatov } 14331cedee13SAndrey Ignatov fl6.fl6_dport = sin6->sin6_port; 14341cedee13SAndrey Ignatov fl6.daddr = sin6->sin6_addr; 14351cedee13SAndrey Ignatov } 14361cedee13SAndrey Ignatov } 14371cedee13SAndrey Ignatov 14384c9483b2SDavid S. Miller final_p = fl6_update_dst(&fl6, opt, &final); 143920c59de2SArnaud Ebalard if (final_p) 14409f542f61SAlexey Kodanev connected = false; 1441db8dac20SDavid S. Miller 14424c9483b2SDavid S. Miller if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr)) { 14434c9483b2SDavid S. Miller fl6.flowi6_oif = np->mcast_oif; 14449f542f61SAlexey Kodanev connected = false; 1445c4062dfcSErich E. Hoover } else if (!fl6.flowi6_oif) 1446c4062dfcSErich E. Hoover fl6.flowi6_oif = np->ucast_oif; 1447db8dac20SDavid S. Miller 14484c9483b2SDavid S. Miller security_sk_classify_flow(sk, flowi6_to_flowi(&fl6)); 1449db8dac20SDavid S. Miller 145038b7097bSHannes Frederic Sowa if (ipc6.tclass < 0) 145138b7097bSHannes Frederic Sowa ipc6.tclass = np->tclass; 145238b7097bSHannes Frederic Sowa 145338b7097bSHannes Frederic Sowa fl6.flowlabel = ip6_make_flowinfo(ipc6.tclass, fl6.flowlabel); 145438b7097bSHannes Frederic Sowa 14554f858c56SAlexey Kodanev dst = ip6_sk_dst_lookup_flow(sk, &fl6, final_p, connected); 145668d0c6d3SDavid S. Miller if (IS_ERR(dst)) { 145768d0c6d3SDavid S. Miller err = PTR_ERR(dst); 145868d0c6d3SDavid S. Miller dst = NULL; 1459db8dac20SDavid S. Miller goto out; 1460db8dac20SDavid S. Miller } 1461db8dac20SDavid S. Miller 146226879da5SWei Wang if (ipc6.hlimit < 0) 146326879da5SWei Wang ipc6.hlimit = ip6_sk_dst_hoplimit(np, &fl6, dst); 1464db8dac20SDavid S. Miller 1465db8dac20SDavid S. Miller if (msg->msg_flags&MSG_CONFIRM) 1466db8dac20SDavid S. Miller goto do_confirm; 1467db8dac20SDavid S. Miller back_from_confirm: 1468db8dac20SDavid S. Miller 146903485f2aSVlad Yasevich /* Lockless fast path for the non-corking case */ 147003485f2aSVlad Yasevich if (!corkreq) { 14711cd7884dSWillem de Bruijn struct inet_cork_full cork; 147203485f2aSVlad Yasevich struct sk_buff *skb; 147303485f2aSVlad Yasevich 147403485f2aSVlad Yasevich skb = ip6_make_skb(sk, getfrag, msg, ulen, 147526879da5SWei Wang sizeof(struct udphdr), &ipc6, 147603485f2aSVlad Yasevich &fl6, (struct rt6_info *)dst, 14775fdaa88dSWillem de Bruijn msg->msg_flags, &cork); 147803485f2aSVlad Yasevich err = PTR_ERR(skb); 147903485f2aSVlad Yasevich if (!IS_ERR_OR_NULL(skb)) 1480bec1f6f6SWillem de Bruijn err = udp_v6_send_skb(skb, &fl6, &cork.base); 14814f858c56SAlexey Kodanev goto out; 148203485f2aSVlad Yasevich } 148303485f2aSVlad Yasevich 1484db8dac20SDavid S. Miller lock_sock(sk); 1485db8dac20SDavid S. Miller if (unlikely(up->pending)) { 1486db8dac20SDavid S. Miller /* The socket is already corked while preparing it. */ 1487db8dac20SDavid S. Miller /* ... which is an evident application bug. --ANK */ 1488db8dac20SDavid S. Miller release_sock(sk); 1489db8dac20SDavid S. Miller 1490ba7a46f1SJoe Perches net_dbg_ratelimited("udp cork app bug 2\n"); 1491db8dac20SDavid S. Miller err = -EINVAL; 1492db8dac20SDavid S. Miller goto out; 1493db8dac20SDavid S. Miller } 1494db8dac20SDavid S. Miller 1495db8dac20SDavid S. Miller up->pending = AF_INET6; 1496db8dac20SDavid S. Miller 1497db8dac20SDavid S. Miller do_append_data: 149826879da5SWei Wang if (ipc6.dontfrag < 0) 149926879da5SWei Wang ipc6.dontfrag = np->dontfrag; 1500db8dac20SDavid S. Miller up->len += ulen; 150126879da5SWei Wang err = ip6_append_data(sk, getfrag, msg, ulen, sizeof(struct udphdr), 150226879da5SWei Wang &ipc6, &fl6, (struct rt6_info *)dst, 15035fdaa88dSWillem de Bruijn corkreq ? msg->msg_flags|MSG_MORE : msg->msg_flags); 1504db8dac20SDavid S. Miller if (err) 1505db8dac20SDavid S. Miller udp_v6_flush_pending_frames(sk); 1506db8dac20SDavid S. Miller else if (!corkreq) 1507db8dac20SDavid S. Miller err = udp_v6_push_pending_frames(sk); 1508db8dac20SDavid S. Miller else if (unlikely(skb_queue_empty(&sk->sk_write_queue))) 1509db8dac20SDavid S. Miller up->pending = 0; 1510db8dac20SDavid S. Miller 151103485f2aSVlad Yasevich if (err > 0) 151203485f2aSVlad Yasevich err = np->recverr ? net_xmit_errno(err) : 0; 151303485f2aSVlad Yasevich release_sock(sk); 151403485f2aSVlad Yasevich 1515db8dac20SDavid S. Miller out: 1516a3c96089SYOSHIFUJI Hideaki dst_release(dst); 15171cedee13SAndrey Ignatov out_no_dst: 1518db8dac20SDavid S. Miller fl6_sock_release(flowlabel); 151945f6fad8SEric Dumazet txopt_put(opt_to_free); 1520db8dac20SDavid S. Miller if (!err) 1521db8dac20SDavid S. Miller return len; 1522db8dac20SDavid S. Miller /* 1523db8dac20SDavid S. Miller * ENOBUFS = no kernel mem, SOCK_NOSPACE = no sndbuf space. Reporting 1524db8dac20SDavid S. Miller * ENOBUFS might not be good (it's not tunable per se), but otherwise 1525db8dac20SDavid S. Miller * we don't have a good statistic (IpOutDiscards but it can be too many 1526db8dac20SDavid S. Miller * things). We could add another new stat but at least for now that 1527db8dac20SDavid S. Miller * seems like overkill. 1528db8dac20SDavid S. Miller */ 1529db8dac20SDavid S. Miller if (err == -ENOBUFS || test_bit(SOCK_NOSPACE, &sk->sk_socket->flags)) { 15306aef70a8SEric Dumazet UDP6_INC_STATS(sock_net(sk), 1531235b9f7aSPavel Emelyanov UDP_MIB_SNDBUFERRORS, is_udplite); 1532db8dac20SDavid S. Miller } 1533db8dac20SDavid S. Miller return err; 1534db8dac20SDavid S. Miller 1535db8dac20SDavid S. Miller do_confirm: 15360dec879fSJulian Anastasov if (msg->msg_flags & MSG_PROBE) 15370dec879fSJulian Anastasov dst_confirm_neigh(dst, &fl6.daddr); 1538db8dac20SDavid S. Miller if (!(msg->msg_flags&MSG_PROBE) || len) 1539db8dac20SDavid S. Miller goto back_from_confirm; 1540db8dac20SDavid S. Miller err = 0; 1541db8dac20SDavid S. Miller goto out; 1542db8dac20SDavid S. Miller } 1543db8dac20SDavid S. Miller 15447d06b2e0SBrian Haley void udpv6_destroy_sock(struct sock *sk) 1545db8dac20SDavid S. Miller { 154644046a59STom Parkin struct udp_sock *up = udp_sk(sk); 1547db8dac20SDavid S. Miller lock_sock(sk); 1548db8dac20SDavid S. Miller udp_v6_flush_pending_frames(sk); 1549db8dac20SDavid S. Miller release_sock(sk); 1550db8dac20SDavid S. Miller 155160fb9567SPaolo Abeni if (static_branch_unlikely(&udpv6_encap_needed_key)) { 155260fb9567SPaolo Abeni if (up->encap_type) { 155344046a59STom Parkin void (*encap_destroy)(struct sock *sk); 15546aa7de05SMark Rutland encap_destroy = READ_ONCE(up->encap_destroy); 155544046a59STom Parkin if (encap_destroy) 155644046a59STom Parkin encap_destroy(sk); 155744046a59STom Parkin } 155860fb9567SPaolo Abeni if (up->encap_enabled) 155960fb9567SPaolo Abeni static_branch_disable(&udpv6_encap_needed_key); 156060fb9567SPaolo Abeni } 156144046a59STom Parkin 1562db8dac20SDavid S. Miller inet6_destroy_sock(sk); 1563db8dac20SDavid S. Miller } 1564db8dac20SDavid S. Miller 1565db8dac20SDavid S. Miller /* 1566db8dac20SDavid S. Miller * Socket option code for UDP 1567db8dac20SDavid S. Miller */ 1568db8dac20SDavid S. Miller int udpv6_setsockopt(struct sock *sk, int level, int optname, 1569b7058842SDavid S. Miller char __user *optval, unsigned int optlen) 1570db8dac20SDavid S. Miller { 1571db8dac20SDavid S. Miller if (level == SOL_UDP || level == SOL_UDPLITE) 1572db8dac20SDavid S. Miller return udp_lib_setsockopt(sk, level, optname, optval, optlen, 1573db8dac20SDavid S. Miller udp_v6_push_pending_frames); 1574db8dac20SDavid S. Miller return ipv6_setsockopt(sk, level, optname, optval, optlen); 1575db8dac20SDavid S. Miller } 1576db8dac20SDavid S. Miller 1577db8dac20SDavid S. Miller #ifdef CONFIG_COMPAT 1578db8dac20SDavid S. Miller int compat_udpv6_setsockopt(struct sock *sk, int level, int optname, 1579b7058842SDavid S. Miller char __user *optval, unsigned int optlen) 1580db8dac20SDavid S. Miller { 1581db8dac20SDavid S. Miller if (level == SOL_UDP || level == SOL_UDPLITE) 1582db8dac20SDavid S. Miller return udp_lib_setsockopt(sk, level, optname, optval, optlen, 1583db8dac20SDavid S. Miller udp_v6_push_pending_frames); 1584db8dac20SDavid S. Miller return compat_ipv6_setsockopt(sk, level, optname, optval, optlen); 1585db8dac20SDavid S. Miller } 1586db8dac20SDavid S. Miller #endif 1587db8dac20SDavid S. Miller 1588db8dac20SDavid S. Miller int udpv6_getsockopt(struct sock *sk, int level, int optname, 1589db8dac20SDavid S. Miller char __user *optval, int __user *optlen) 1590db8dac20SDavid S. Miller { 1591db8dac20SDavid S. Miller if (level == SOL_UDP || level == SOL_UDPLITE) 1592db8dac20SDavid S. Miller return udp_lib_getsockopt(sk, level, optname, optval, optlen); 1593db8dac20SDavid S. Miller return ipv6_getsockopt(sk, level, optname, optval, optlen); 1594db8dac20SDavid S. Miller } 1595db8dac20SDavid S. Miller 1596db8dac20SDavid S. Miller #ifdef CONFIG_COMPAT 1597db8dac20SDavid S. Miller int compat_udpv6_getsockopt(struct sock *sk, int level, int optname, 1598db8dac20SDavid S. Miller char __user *optval, int __user *optlen) 1599db8dac20SDavid S. Miller { 1600db8dac20SDavid S. Miller if (level == SOL_UDP || level == SOL_UDPLITE) 1601db8dac20SDavid S. Miller return udp_lib_getsockopt(sk, level, optname, optval, optlen); 1602db8dac20SDavid S. Miller return compat_ipv6_getsockopt(sk, level, optname, optval, optlen); 1603db8dac20SDavid S. Miller } 1604db8dac20SDavid S. Miller #endif 1605db8dac20SDavid S. Miller 1606a8e3bb34SDavid Ahern /* thinking of making this const? Don't. 1607a8e3bb34SDavid Ahern * early_demux can change based on sysctl. 1608a8e3bb34SDavid Ahern */ 1609dddb64bcSsubashab@codeaurora.org static struct inet6_protocol udpv6_protocol = { 16105425077dSsubashab@codeaurora.org .early_demux = udp_v6_early_demux, 1611dddb64bcSsubashab@codeaurora.org .early_demux_handler = udp_v6_early_demux, 1612db8dac20SDavid S. Miller .handler = udpv6_rcv, 1613db8dac20SDavid S. Miller .err_handler = udpv6_err, 1614db8dac20SDavid S. Miller .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL, 1615db8dac20SDavid S. Miller }; 1616db8dac20SDavid S. Miller 1617db8dac20SDavid S. Miller /* ------------------------------------------------------------------------ */ 1618db8dac20SDavid S. Miller #ifdef CONFIG_PROC_FS 1619db8dac20SDavid S. Miller int udp6_seq_show(struct seq_file *seq, void *v) 1620db8dac20SDavid S. Miller { 162117ef66afSLorenzo Colitti if (v == SEQ_START_TOKEN) { 162217ef66afSLorenzo Colitti seq_puts(seq, IPV6_SEQ_DGRAM_HEADER); 162317ef66afSLorenzo Colitti } else { 162417ef66afSLorenzo Colitti int bucket = ((struct udp_iter_state *)seq->private)->bucket; 162517ef66afSLorenzo Colitti struct inet_sock *inet = inet_sk(v); 162617ef66afSLorenzo Colitti __u16 srcp = ntohs(inet->inet_sport); 162717ef66afSLorenzo Colitti __u16 destp = ntohs(inet->inet_dport); 16286c206b20SPaolo Abeni __ip6_dgram_sock_seq_show(seq, v, srcp, destp, 16296c206b20SPaolo Abeni udp_rqueue_get(v), bucket); 163017ef66afSLorenzo Colitti } 1631db8dac20SDavid S. Miller return 0; 1632db8dac20SDavid S. Miller } 1633db8dac20SDavid S. Miller 1634c3506372SChristoph Hellwig const struct seq_operations udp6_seq_ops = { 1635a3d2599bSChristoph Hellwig .start = udp_seq_start, 1636a3d2599bSChristoph Hellwig .next = udp_seq_next, 1637a3d2599bSChristoph Hellwig .stop = udp_seq_stop, 1638a3d2599bSChristoph Hellwig .show = udp6_seq_show, 1639a3d2599bSChristoph Hellwig }; 1640c3506372SChristoph Hellwig EXPORT_SYMBOL(udp6_seq_ops); 164173cb88ecSArjan van de Ven 1642db8dac20SDavid S. Miller static struct udp_seq_afinfo udp6_seq_afinfo = { 1643db8dac20SDavid S. Miller .family = AF_INET6, 1644645ca708SEric Dumazet .udp_table = &udp_table, 1645db8dac20SDavid S. Miller }; 1646db8dac20SDavid S. Miller 16472c8c1e72SAlexey Dobriyan int __net_init udp6_proc_init(struct net *net) 1648db8dac20SDavid S. Miller { 1649c3506372SChristoph Hellwig if (!proc_create_net_data("udp6", 0444, net->proc_net, &udp6_seq_ops, 1650c3506372SChristoph Hellwig sizeof(struct udp_iter_state), &udp6_seq_afinfo)) 1651a3d2599bSChristoph Hellwig return -ENOMEM; 1652a3d2599bSChristoph Hellwig return 0; 1653db8dac20SDavid S. Miller } 1654db8dac20SDavid S. Miller 1655ec120da6SIan Morris void udp6_proc_exit(struct net *net) 1656ec120da6SIan Morris { 1657a3d2599bSChristoph Hellwig remove_proc_entry("udp6", net->proc_net); 1658db8dac20SDavid S. Miller } 1659db8dac20SDavid S. Miller #endif /* CONFIG_PROC_FS */ 1660db8dac20SDavid S. Miller 1661db8dac20SDavid S. Miller /* ------------------------------------------------------------------------ */ 1662db8dac20SDavid S. Miller 1663db8dac20SDavid S. Miller struct proto udpv6_prot = { 1664db8dac20SDavid S. Miller .name = "UDPv6", 1665db8dac20SDavid S. Miller .owner = THIS_MODULE, 1666db8dac20SDavid S. Miller .close = udp_lib_close, 1667d74bad4eSAndrey Ignatov .pre_connect = udpv6_pre_connect, 1668db8dac20SDavid S. Miller .connect = ip6_datagram_connect, 1669db8dac20SDavid S. Miller .disconnect = udp_disconnect, 1670db8dac20SDavid S. Miller .ioctl = udp_ioctl, 1671850cbaddSPaolo Abeni .init = udp_init_sock, 1672db8dac20SDavid S. Miller .destroy = udpv6_destroy_sock, 1673db8dac20SDavid S. Miller .setsockopt = udpv6_setsockopt, 1674db8dac20SDavid S. Miller .getsockopt = udpv6_getsockopt, 1675db8dac20SDavid S. Miller .sendmsg = udpv6_sendmsg, 1676db8dac20SDavid S. Miller .recvmsg = udpv6_recvmsg, 1677e646b657SMartin KaFai Lau .release_cb = ip6_datagram_release_cb, 1678db8dac20SDavid S. Miller .hash = udp_lib_hash, 1679db8dac20SDavid S. Miller .unhash = udp_lib_unhash, 1680719f8358SEric Dumazet .rehash = udp_v6_rehash, 1681db8dac20SDavid S. Miller .get_port = udp_v6_get_port, 1682db8dac20SDavid S. Miller .memory_allocated = &udp_memory_allocated, 1683db8dac20SDavid S. Miller .sysctl_mem = sysctl_udp_mem, 16841e802951STonghao Zhang .sysctl_wmem_offset = offsetof(struct net, ipv4.sysctl_udp_wmem_min), 16851e802951STonghao Zhang .sysctl_rmem_offset = offsetof(struct net, ipv4.sysctl_udp_rmem_min), 1686db8dac20SDavid S. Miller .obj_size = sizeof(struct udp6_sock), 1687645ca708SEric Dumazet .h.udp_table = &udp_table, 1688db8dac20SDavid S. Miller #ifdef CONFIG_COMPAT 1689db8dac20SDavid S. Miller .compat_setsockopt = compat_udpv6_setsockopt, 1690db8dac20SDavid S. Miller .compat_getsockopt = compat_udpv6_getsockopt, 1691db8dac20SDavid S. Miller #endif 16925d77dca8SDavid Ahern .diag_destroy = udp_abort, 1693db8dac20SDavid S. Miller }; 1694db8dac20SDavid S. Miller 1695db8dac20SDavid S. Miller static struct inet_protosw udpv6_protosw = { 1696db8dac20SDavid S. Miller .type = SOCK_DGRAM, 1697db8dac20SDavid S. Miller .protocol = IPPROTO_UDP, 1698db8dac20SDavid S. Miller .prot = &udpv6_prot, 1699db8dac20SDavid S. Miller .ops = &inet6_dgram_ops, 1700db8dac20SDavid S. Miller .flags = INET_PROTOSW_PERMANENT, 1701db8dac20SDavid S. Miller }; 1702db8dac20SDavid S. Miller 1703db8dac20SDavid S. Miller int __init udpv6_init(void) 1704db8dac20SDavid S. Miller { 1705db8dac20SDavid S. Miller int ret; 1706db8dac20SDavid S. Miller 17073336288aSVlad Yasevich ret = inet6_add_protocol(&udpv6_protocol, IPPROTO_UDP); 17083336288aSVlad Yasevich if (ret) 1709c6b641a4SVlad Yasevich goto out; 17103336288aSVlad Yasevich 1711db8dac20SDavid S. Miller ret = inet6_register_protosw(&udpv6_protosw); 1712db8dac20SDavid S. Miller if (ret) 1713db8dac20SDavid S. Miller goto out_udpv6_protocol; 1714db8dac20SDavid S. Miller out: 1715db8dac20SDavid S. Miller return ret; 1716db8dac20SDavid S. Miller 1717db8dac20SDavid S. Miller out_udpv6_protocol: 1718db8dac20SDavid S. Miller inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP); 1719db8dac20SDavid S. Miller goto out; 1720db8dac20SDavid S. Miller } 1721db8dac20SDavid S. Miller 1722db8dac20SDavid S. Miller void udpv6_exit(void) 1723db8dac20SDavid S. Miller { 1724db8dac20SDavid S. Miller inet6_unregister_protosw(&udpv6_protosw); 1725db8dac20SDavid S. Miller inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP); 1726db8dac20SDavid S. Miller } 1727