12874c5fdSThomas Gleixner // SPDX-License-Identifier: GPL-2.0-or-later 2db8dac20SDavid S. Miller /* 3db8dac20SDavid S. Miller * UDP over IPv6 4db8dac20SDavid S. Miller * Linux INET6 implementation 5db8dac20SDavid S. Miller * 6db8dac20SDavid S. Miller * Authors: 7db8dac20SDavid S. Miller * Pedro Roque <roque@di.fc.ul.pt> 8db8dac20SDavid S. Miller * 9db8dac20SDavid S. Miller * Based on linux/ipv4/udp.c 10db8dac20SDavid S. Miller * 11db8dac20SDavid S. Miller * Fixes: 12db8dac20SDavid S. Miller * Hideaki YOSHIFUJI : sin6_scope_id support 13db8dac20SDavid S. Miller * YOSHIFUJI Hideaki @USAGI and: Support IPV6_V6ONLY socket option, which 14db8dac20SDavid S. Miller * Alexey Kuznetsov allow both IPv4 and IPv6 sockets to bind 15db8dac20SDavid S. Miller * a single port at the same time. 16db8dac20SDavid S. Miller * Kazunori MIYAZAWA @USAGI: change process style to use ip6_append_data 17db8dac20SDavid S. Miller * YOSHIFUJI Hideaki @USAGI: convert /proc/net/udp6 to seq_file. 18db8dac20SDavid S. Miller */ 19db8dac20SDavid S. Miller 20db8dac20SDavid S. Miller #include <linux/errno.h> 21db8dac20SDavid S. Miller #include <linux/types.h> 22db8dac20SDavid S. Miller #include <linux/socket.h> 23db8dac20SDavid S. Miller #include <linux/sockios.h> 24db8dac20SDavid S. Miller #include <linux/net.h> 25db8dac20SDavid S. Miller #include <linux/in6.h> 26db8dac20SDavid S. Miller #include <linux/netdevice.h> 27db8dac20SDavid S. Miller #include <linux/if_arp.h> 28db8dac20SDavid S. Miller #include <linux/ipv6.h> 29db8dac20SDavid S. Miller #include <linux/icmpv6.h> 30db8dac20SDavid S. Miller #include <linux/init.h> 31db8dac20SDavid S. Miller #include <linux/module.h> 32db8dac20SDavid S. Miller #include <linux/skbuff.h> 335a0e3ad6STejun Heo #include <linux/slab.h> 347c0f6ba6SLinus Torvalds #include <linux/uaccess.h> 350e219ae4SPaolo Abeni #include <linux/indirect_call_wrapper.h> 36db8dac20SDavid S. Miller 37496611d7SCraig Gallek #include <net/addrconf.h> 38db8dac20SDavid S. Miller #include <net/ndisc.h> 39db8dac20SDavid S. Miller #include <net/protocol.h> 40db8dac20SDavid S. Miller #include <net/transp_v6.h> 41db8dac20SDavid S. Miller #include <net/ip6_route.h> 42db8dac20SDavid S. Miller #include <net/raw.h> 43db8dac20SDavid S. Miller #include <net/tcp_states.h> 44db8dac20SDavid S. Miller #include <net/ip6_checksum.h> 45e7cc0824SStefano Brivio #include <net/ip6_tunnel.h> 46db8dac20SDavid S. Miller #include <net/xfrm.h> 470bd84065Ssubashab@codeaurora.org #include <net/inet_hashtables.h> 4872289b96STom Herbert #include <net/inet6_hashtables.h> 49076bb0c8SEliezer Tamir #include <net/busy_poll.h> 50e32ea7e7SCraig Gallek #include <net/sock_reuseport.h> 51db8dac20SDavid S. Miller 52db8dac20SDavid S. Miller #include <linux/proc_fs.h> 53db8dac20SDavid S. Miller #include <linux/seq_file.h> 5422911fc5SEric Dumazet #include <trace/events/skb.h> 55db8dac20SDavid S. Miller #include "udp_impl.h" 56db8dac20SDavid S. Miller 576eada011SEric Dumazet static u32 udp6_ehashfn(const struct net *net, 58b50026b5SHannes Frederic Sowa const struct in6_addr *laddr, 59b50026b5SHannes Frederic Sowa const u16 lport, 60b50026b5SHannes Frederic Sowa const struct in6_addr *faddr, 61b50026b5SHannes Frederic Sowa const __be16 fport) 62b50026b5SHannes Frederic Sowa { 631bbdceefSHannes Frederic Sowa static u32 udp6_ehash_secret __read_mostly; 641bbdceefSHannes Frederic Sowa static u32 udp_ipv6_hash_secret __read_mostly; 651bbdceefSHannes Frederic Sowa 661bbdceefSHannes Frederic Sowa u32 lhash, fhash; 671bbdceefSHannes Frederic Sowa 681bbdceefSHannes Frederic Sowa net_get_random_once(&udp6_ehash_secret, 691bbdceefSHannes Frederic Sowa sizeof(udp6_ehash_secret)); 701bbdceefSHannes Frederic Sowa net_get_random_once(&udp_ipv6_hash_secret, 711bbdceefSHannes Frederic Sowa sizeof(udp_ipv6_hash_secret)); 721bbdceefSHannes Frederic Sowa 731bbdceefSHannes Frederic Sowa lhash = (__force u32)laddr->s6_addr32[3]; 741bbdceefSHannes Frederic Sowa fhash = __ipv6_addr_jhash(faddr, udp_ipv6_hash_secret); 751bbdceefSHannes Frederic Sowa 76b50026b5SHannes Frederic Sowa return __inet6_ehashfn(lhash, lport, fhash, fport, 771bbdceefSHannes Frederic Sowa udp_ipv6_hash_secret + net_hash_mix(net)); 78b50026b5SHannes Frederic Sowa } 79b50026b5SHannes Frederic Sowa 806ba5a3c5SPavel Emelyanov int udp_v6_get_port(struct sock *sk, unsigned short snum) 81db8dac20SDavid S. Miller { 8230fff923SEric Dumazet unsigned int hash2_nulladdr = 83f0b1e64cSMartin KaFai Lau ipv6_portaddr_hash(sock_net(sk), &in6addr_any, snum); 8430fff923SEric Dumazet unsigned int hash2_partial = 85f0b1e64cSMartin KaFai Lau ipv6_portaddr_hash(sock_net(sk), &sk->sk_v6_rcv_saddr, 0); 8630fff923SEric Dumazet 87d4cada4aSEric Dumazet /* precompute partial secondary hash */ 8830fff923SEric Dumazet udp_sk(sk)->udp_portaddr_hash = hash2_partial; 89fe38d2a1SJosef Bacik return udp_lib_get_port(sk, snum, hash2_nulladdr); 90db8dac20SDavid S. Miller } 91db8dac20SDavid S. Miller 92f7c46156SAlexey Kodanev void udp_v6_rehash(struct sock *sk) 93719f8358SEric Dumazet { 94f0b1e64cSMartin KaFai Lau u16 new_hash = ipv6_portaddr_hash(sock_net(sk), 95efe4208fSEric Dumazet &sk->sk_v6_rcv_saddr, 96719f8358SEric Dumazet inet_sk(sk)->inet_num); 97719f8358SEric Dumazet 98719f8358SEric Dumazet udp_lib_rehash(sk, new_hash); 99719f8358SEric Dumazet } 100719f8358SEric Dumazet 101d1e37288SSu, Xuemin static int compute_score(struct sock *sk, struct net *net, 10288440ae7SBalazs Scheidler const struct in6_addr *saddr, __be16 sport, 103d1e37288SSu, Xuemin const struct in6_addr *daddr, unsigned short hnum, 10473545373STim Beale int dif, int sdif) 105db8dac20SDavid S. Miller { 10660c04aecSJoe Perches int score; 10760c04aecSJoe Perches struct inet_sock *inet; 1086da5b0f0SMike Manning bool dev_match; 109db8dac20SDavid S. Miller 11060c04aecSJoe Perches if (!net_eq(sock_net(sk), net) || 11160c04aecSJoe Perches udp_sk(sk)->udp_port_hash != hnum || 11260c04aecSJoe Perches sk->sk_family != PF_INET6) 11360c04aecSJoe Perches return -1; 114645ca708SEric Dumazet 11523b0269eSPeter Oskolkov if (!ipv6_addr_equal(&sk->sk_v6_rcv_saddr, daddr)) 11623b0269eSPeter Oskolkov return -1; 11723b0269eSPeter Oskolkov 118645ca708SEric Dumazet score = 0; 11960c04aecSJoe Perches inet = inet_sk(sk); 12060c04aecSJoe Perches 121c720c7e8SEric Dumazet if (inet->inet_dport) { 122c720c7e8SEric Dumazet if (inet->inet_dport != sport) 123645ca708SEric Dumazet return -1; 124db8dac20SDavid S. Miller score++; 125db8dac20SDavid S. Miller } 12660c04aecSJoe Perches 127efe4208fSEric Dumazet if (!ipv6_addr_any(&sk->sk_v6_daddr)) { 128efe4208fSEric Dumazet if (!ipv6_addr_equal(&sk->sk_v6_daddr, saddr)) 129645ca708SEric Dumazet return -1; 130db8dac20SDavid S. Miller score++; 131db8dac20SDavid S. Miller } 13260c04aecSJoe Perches 1336da5b0f0SMike Manning dev_match = udp_sk_bound_dev_eq(net, sk->sk_bound_dev_if, dif, sdif); 13469678bcdSPaolo Abeni if (!dev_match) 135645ca708SEric Dumazet return -1; 136db8dac20SDavid S. Miller score++; 13760c04aecSJoe Perches 1387170a977SEric Dumazet if (READ_ONCE(sk->sk_incoming_cpu) == raw_smp_processor_id()) 13970da268bSEric Dumazet score++; 14070da268bSEric Dumazet 141645ca708SEric Dumazet return score; 142645ca708SEric Dumazet } 143645ca708SEric Dumazet 144a57066b1SDavid S. Miller static struct sock *lookup_reuseport(struct net *net, struct sock *sk, 1452a08748cSJakub Sitnicki struct sk_buff *skb, 1462a08748cSJakub Sitnicki const struct in6_addr *saddr, 1472a08748cSJakub Sitnicki __be16 sport, 1482a08748cSJakub Sitnicki const struct in6_addr *daddr, 1492a08748cSJakub Sitnicki unsigned int hnum) 1502a08748cSJakub Sitnicki { 1512a08748cSJakub Sitnicki struct sock *reuse_sk = NULL; 1522a08748cSJakub Sitnicki u32 hash; 1532a08748cSJakub Sitnicki 1542a08748cSJakub Sitnicki if (sk->sk_reuseport && sk->sk_state != TCP_ESTABLISHED) { 1552a08748cSJakub Sitnicki hash = udp6_ehashfn(net, daddr, hnum, saddr, sport); 1562a08748cSJakub Sitnicki reuse_sk = reuseport_select_sock(sk, hash, skb, 1572a08748cSJakub Sitnicki sizeof(struct udphdr)); 1582a08748cSJakub Sitnicki } 1592a08748cSJakub Sitnicki return reuse_sk; 1602a08748cSJakub Sitnicki } 1612a08748cSJakub Sitnicki 162d1e37288SSu, Xuemin /* called with rcu_read_lock() */ 163fddc17deSEric Dumazet static struct sock *udp6_lib_lookup2(struct net *net, 164fddc17deSEric Dumazet const struct in6_addr *saddr, __be16 sport, 1651801b570SDavid Ahern const struct in6_addr *daddr, unsigned int hnum, 16673545373STim Beale int dif, int sdif, struct udp_hslot *hslot2, 16773545373STim Beale struct sk_buff *skb) 168fddc17deSEric Dumazet { 169fddc17deSEric Dumazet struct sock *sk, *result; 170e94a62f5SPaolo Abeni int score, badness; 171fddc17deSEric Dumazet 172fddc17deSEric Dumazet result = NULL; 173fddc17deSEric Dumazet badness = -1; 174ca065d0cSEric Dumazet udp_portaddr_for_each_entry_rcu(sk, &hslot2->head) { 175d1e37288SSu, Xuemin score = compute_score(sk, net, saddr, sport, 17673545373STim Beale daddr, hnum, dif, sdif); 177fddc17deSEric Dumazet if (score > badness) { 1782a08748cSJakub Sitnicki result = lookup_reuseport(net, sk, skb, 1792a08748cSJakub Sitnicki saddr, sport, daddr, hnum); 180a57066b1SDavid S. Miller /* Fall back to scoring if group has connections */ 181a57066b1SDavid S. Miller if (result && !reuseport_has_conns(sk, false)) 182ca065d0cSEric Dumazet return result; 1832a08748cSJakub Sitnicki 184a57066b1SDavid S. Miller result = result ? : sk; 185ca065d0cSEric Dumazet badness = score; 186fddc17deSEric Dumazet } 187fddc17deSEric Dumazet } 188fddc17deSEric Dumazet return result; 189fddc17deSEric Dumazet } 190fddc17deSEric Dumazet 1916d4201b1SJakub Sitnicki static inline struct sock *udp6_lookup_run_bpf(struct net *net, 1926d4201b1SJakub Sitnicki struct udp_table *udptable, 1936d4201b1SJakub Sitnicki struct sk_buff *skb, 1946d4201b1SJakub Sitnicki const struct in6_addr *saddr, 1956d4201b1SJakub Sitnicki __be16 sport, 1966d4201b1SJakub Sitnicki const struct in6_addr *daddr, 1976d4201b1SJakub Sitnicki u16 hnum) 1986d4201b1SJakub Sitnicki { 1996d4201b1SJakub Sitnicki struct sock *sk, *reuse_sk; 2006d4201b1SJakub Sitnicki bool no_reuseport; 2016d4201b1SJakub Sitnicki 2026d4201b1SJakub Sitnicki if (udptable != &udp_table) 2036d4201b1SJakub Sitnicki return NULL; /* only UDP is supported */ 2046d4201b1SJakub Sitnicki 2056d4201b1SJakub Sitnicki no_reuseport = bpf_sk_lookup_run_v6(net, IPPROTO_UDP, 2066d4201b1SJakub Sitnicki saddr, sport, daddr, hnum, &sk); 2076d4201b1SJakub Sitnicki if (no_reuseport || IS_ERR_OR_NULL(sk)) 2086d4201b1SJakub Sitnicki return sk; 2096d4201b1SJakub Sitnicki 2106d4201b1SJakub Sitnicki reuse_sk = lookup_reuseport(net, sk, skb, saddr, sport, daddr, hnum); 211c64c9c28SJakub Sitnicki if (reuse_sk) 2126d4201b1SJakub Sitnicki sk = reuse_sk; 2136d4201b1SJakub Sitnicki return sk; 2146d4201b1SJakub Sitnicki } 2156d4201b1SJakub Sitnicki 216ca065d0cSEric Dumazet /* rcu_read_lock() must be held */ 217fce82338SPavel Emelyanov struct sock *__udp6_lib_lookup(struct net *net, 21888440ae7SBalazs Scheidler const struct in6_addr *saddr, __be16 sport, 21988440ae7SBalazs Scheidler const struct in6_addr *daddr, __be16 dport, 2201801b570SDavid Ahern int dif, int sdif, struct udp_table *udptable, 221538950a1SCraig Gallek struct sk_buff *skb) 222645ca708SEric Dumazet { 223645ca708SEric Dumazet unsigned short hnum = ntohs(dport); 22423b0269eSPeter Oskolkov unsigned int hash2, slot2; 22523b0269eSPeter Oskolkov struct udp_hslot *hslot2; 2266d4201b1SJakub Sitnicki struct sock *result, *sk; 227645ca708SEric Dumazet 228f0b1e64cSMartin KaFai Lau hash2 = ipv6_portaddr_hash(net, daddr, hnum); 229fddc17deSEric Dumazet slot2 = hash2 & udptable->mask; 230fddc17deSEric Dumazet hslot2 = &udptable->hash2[slot2]; 231fddc17deSEric Dumazet 2326d4201b1SJakub Sitnicki /* Lookup connected or non-wildcard sockets */ 233fddc17deSEric Dumazet result = udp6_lib_lookup2(net, saddr, sport, 23473545373STim Beale daddr, hnum, dif, sdif, 235d1e37288SSu, Xuemin hslot2, skb); 2366d4201b1SJakub Sitnicki if (!IS_ERR_OR_NULL(result) && result->sk_state == TCP_ESTABLISHED) 2376d4201b1SJakub Sitnicki goto done; 2386d4201b1SJakub Sitnicki 2396d4201b1SJakub Sitnicki /* Lookup redirect from BPF */ 2406d4201b1SJakub Sitnicki if (static_branch_unlikely(&bpf_sk_lookup_enabled)) { 2416d4201b1SJakub Sitnicki sk = udp6_lookup_run_bpf(net, udptable, skb, 2426d4201b1SJakub Sitnicki saddr, sport, daddr, hnum); 2436d4201b1SJakub Sitnicki if (sk) { 2446d4201b1SJakub Sitnicki result = sk; 2456d4201b1SJakub Sitnicki goto done; 2466d4201b1SJakub Sitnicki } 2476d4201b1SJakub Sitnicki } 2486d4201b1SJakub Sitnicki 2496d4201b1SJakub Sitnicki /* Got non-wildcard socket or error on first lookup */ 2506d4201b1SJakub Sitnicki if (result) 2516d4201b1SJakub Sitnicki goto done; 2526d4201b1SJakub Sitnicki 2536d4201b1SJakub Sitnicki /* Lookup wildcard sockets */ 254f0b1e64cSMartin KaFai Lau hash2 = ipv6_portaddr_hash(net, &in6addr_any, hnum); 255fddc17deSEric Dumazet slot2 = hash2 & udptable->mask; 256fddc17deSEric Dumazet hslot2 = &udptable->hash2[slot2]; 257fddc17deSEric Dumazet 2581223c67cSJorge Boncompte [DTI2] result = udp6_lib_lookup2(net, saddr, sport, 25923b0269eSPeter Oskolkov &in6addr_any, hnum, dif, sdif, 26073545373STim Beale hslot2, skb); 2616d4201b1SJakub Sitnicki done: 26226f8113cSEnrico Weigelt if (IS_ERR(result)) 2638217ca65SMartin KaFai Lau return NULL; 264fddc17deSEric Dumazet return result; 265fddc17deSEric Dumazet } 266fce82338SPavel Emelyanov EXPORT_SYMBOL_GPL(__udp6_lib_lookup); 267db8dac20SDavid S. Miller 268607c4aafSKOVACS Krisztian static struct sock *__udp6_lib_lookup_skb(struct sk_buff *skb, 269607c4aafSKOVACS Krisztian __be16 sport, __be16 dport, 270645ca708SEric Dumazet struct udp_table *udptable) 271607c4aafSKOVACS Krisztian { 272b71d1d42SEric Dumazet const struct ipv6hdr *iph = ipv6_hdr(skb); 273607c4aafSKOVACS Krisztian 274ed7cbbceSAlexander Duyck return __udp6_lib_lookup(dev_net(skb->dev), &iph->saddr, sport, 275607c4aafSKOVACS Krisztian &iph->daddr, dport, inet6_iif(skb), 2761801b570SDavid Ahern inet6_sdif(skb), udptable, skb); 277607c4aafSKOVACS Krisztian } 278607c4aafSKOVACS Krisztian 279*7b58e63eSEric Dumazet struct sock *udp6_lib_lookup_skb(const struct sk_buff *skb, 28063058308STom Herbert __be16 sport, __be16 dport) 28163058308STom Herbert { 28263058308STom Herbert const struct ipv6hdr *iph = ipv6_hdr(skb); 28363058308STom Herbert 284ed7cbbceSAlexander Duyck return __udp6_lib_lookup(dev_net(skb->dev), &iph->saddr, sport, 28563058308STom Herbert &iph->daddr, dport, inet6_iif(skb), 286257a525fSMartin KaFai Lau inet6_sdif(skb), &udp_table, NULL); 28763058308STom Herbert } 28863058308STom Herbert EXPORT_SYMBOL_GPL(udp6_lib_lookup_skb); 28963058308STom Herbert 290ca065d0cSEric Dumazet /* Must be called under rcu_read_lock(). 291ca065d0cSEric Dumazet * Does increment socket refcount. 292ca065d0cSEric Dumazet */ 2936e86000cSArnd Bergmann #if IS_ENABLED(CONFIG_NF_TPROXY_IPV6) || IS_ENABLED(CONFIG_NF_SOCKET_IPV6) 294aa976fc0SBalazs Scheidler struct sock *udp6_lib_lookup(struct net *net, const struct in6_addr *saddr, __be16 sport, 295aa976fc0SBalazs Scheidler const struct in6_addr *daddr, __be16 dport, int dif) 296aa976fc0SBalazs Scheidler { 297ca065d0cSEric Dumazet struct sock *sk; 298ca065d0cSEric Dumazet 299ca065d0cSEric Dumazet sk = __udp6_lib_lookup(net, saddr, sport, daddr, dport, 3001801b570SDavid Ahern dif, 0, &udp_table, NULL); 30141c6d650SReshetova, Elena if (sk && !refcount_inc_not_zero(&sk->sk_refcnt)) 302ca065d0cSEric Dumazet sk = NULL; 303ca065d0cSEric Dumazet return sk; 304aa976fc0SBalazs Scheidler } 305aa976fc0SBalazs Scheidler EXPORT_SYMBOL_GPL(udp6_lib_lookup); 306ca065d0cSEric Dumazet #endif 307aa976fc0SBalazs Scheidler 308cb891fa6SPaolo Abeni /* do not use the scratch area len for jumbogram: their length execeeds the 309cb891fa6SPaolo Abeni * scratch area space; note that the IP6CB flags is still in the first 310cb891fa6SPaolo Abeni * cacheline, so checking for jumbograms is cheap 311cb891fa6SPaolo Abeni */ 312cb891fa6SPaolo Abeni static int udp6_skb_len(struct sk_buff *skb) 313cb891fa6SPaolo Abeni { 314cb891fa6SPaolo Abeni return unlikely(inet6_is_jumbogram(skb)) ? skb->len : udp_skb_len(skb); 315cb891fa6SPaolo Abeni } 316cb891fa6SPaolo Abeni 317db8dac20SDavid S. Miller /* 318db8dac20SDavid S. Miller * This should be easy, if there is something there we 319db8dac20SDavid S. Miller * return it, otherwise we block. 320db8dac20SDavid S. Miller */ 321db8dac20SDavid S. Miller 3221b784140SYing Xue int udpv6_recvmsg(struct sock *sk, struct msghdr *msg, size_t len, 323db8dac20SDavid S. Miller int noblock, int flags, int *addr_len) 324db8dac20SDavid S. Miller { 325db8dac20SDavid S. Miller struct ipv6_pinfo *np = inet6_sk(sk); 326db8dac20SDavid S. Miller struct inet_sock *inet = inet_sk(sk); 327db8dac20SDavid S. Miller struct sk_buff *skb; 32859c2cdaeSDavid S. Miller unsigned int ulen, copied; 329fd69c399SPaolo Abeni int off, err, peeking = flags & MSG_PEEK; 330db8dac20SDavid S. Miller int is_udplite = IS_UDPLITE(sk); 331543fc3fbSPaolo Abeni struct udp_mib __percpu *mib; 332197c949eSEric Dumazet bool checksum_valid = false; 333f26ba175SWei Yongjun int is_udp4; 334db8dac20SDavid S. Miller 335db8dac20SDavid S. Miller if (flags & MSG_ERRQUEUE) 33685fbaa75SHannes Frederic Sowa return ipv6_recv_error(sk, msg, len, addr_len); 337db8dac20SDavid S. Miller 3384b340ae2SBrian Haley if (np->rxpmtu && np->rxopt.bits.rxpmtu) 33985fbaa75SHannes Frederic Sowa return ipv6_recv_rxpmtu(sk, msg, len, addr_len); 3404b340ae2SBrian Haley 341db8dac20SDavid S. Miller try_again: 342a0917e0bSMatthew Dawson off = sk_peek_offset(sk, flags); 343fd69c399SPaolo Abeni skb = __skb_recv_udp(sk, flags, noblock, &off, &err); 344db8dac20SDavid S. Miller if (!skb) 345627d2d6bSsamanthakumar return err; 346db8dac20SDavid S. Miller 347cb891fa6SPaolo Abeni ulen = udp6_skb_len(skb); 34859c2cdaeSDavid S. Miller copied = len; 349627d2d6bSsamanthakumar if (copied > ulen - off) 350627d2d6bSsamanthakumar copied = ulen - off; 35159c2cdaeSDavid S. Miller else if (copied < ulen) 352db8dac20SDavid S. Miller msg->msg_flags |= MSG_TRUNC; 353db8dac20SDavid S. Miller 354f26ba175SWei Yongjun is_udp4 = (skb->protocol == htons(ETH_P_IP)); 355029a3743SPaolo Abeni mib = __UDPX_MIB(sk, is_udp4); 356f26ba175SWei Yongjun 357db8dac20SDavid S. Miller /* 358db8dac20SDavid S. Miller * If checksum is needed at all, try to do it while copying the 359db8dac20SDavid S. Miller * data. If the data is truncated, or if we only want a partial 360db8dac20SDavid S. Miller * coverage checksum (UDP-Lite), do it before the copy. 361db8dac20SDavid S. Miller */ 362db8dac20SDavid S. Miller 363d21dbdfeSEric Dumazet if (copied < ulen || peeking || 364d21dbdfeSEric Dumazet (is_udplite && UDP_SKB_CB(skb)->partial_cov)) { 36567a51780SPaolo Abeni checksum_valid = udp_skb_csum_unnecessary(skb) || 36667a51780SPaolo Abeni !__udp_lib_checksum_complete(skb); 367197c949eSEric Dumazet if (!checksum_valid) 368db8dac20SDavid S. Miller goto csum_copy_err; 369db8dac20SDavid S. Miller } 370db8dac20SDavid S. Miller 37167a51780SPaolo Abeni if (checksum_valid || udp_skb_csum_unnecessary(skb)) { 37267a51780SPaolo Abeni if (udp_skb_is_linear(skb)) 37367a51780SPaolo Abeni err = copy_linear_skb(skb, copied, off, &msg->msg_iter); 37467a51780SPaolo Abeni else 375627d2d6bSsamanthakumar err = skb_copy_datagram_msg(skb, off, msg, copied); 37667a51780SPaolo Abeni } else { 377627d2d6bSsamanthakumar err = skb_copy_and_csum_datagram_msg(skb, off, msg); 378db8dac20SDavid S. Miller if (err == -EINVAL) 379db8dac20SDavid S. Miller goto csum_copy_err; 380db8dac20SDavid S. Miller } 38122911fc5SEric Dumazet if (unlikely(err)) { 382fd69c399SPaolo Abeni if (!peeking) { 383979402b1SEric Dumazet atomic_inc(&sk->sk_drops); 384029a3743SPaolo Abeni SNMP_INC_STATS(mib, UDP_MIB_INERRORS); 385979402b1SEric Dumazet } 386850cbaddSPaolo Abeni kfree_skb(skb); 387627d2d6bSsamanthakumar return err; 38822911fc5SEric Dumazet } 389fd69c399SPaolo Abeni if (!peeking) 390029a3743SPaolo Abeni SNMP_INC_STATS(mib, UDP_MIB_INDATAGRAMS); 391db8dac20SDavid S. Miller 3923b885787SNeil Horman sock_recv_ts_and_drops(msg, sk, skb); 393db8dac20SDavid S. Miller 394db8dac20SDavid S. Miller /* Copy the address. */ 395db8dac20SDavid S. Miller if (msg->msg_name) { 396342dfc30SSteffen Hurrle DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, msg->msg_name); 397db8dac20SDavid S. Miller sin6->sin6_family = AF_INET6; 398db8dac20SDavid S. Miller sin6->sin6_port = udp_hdr(skb)->source; 399db8dac20SDavid S. Miller sin6->sin6_flowinfo = 0; 400db8dac20SDavid S. Miller 401842df073SHannes Frederic Sowa if (is_udp4) { 402b301e82cSBrian Haley ipv6_addr_set_v4mapped(ip_hdr(skb)->saddr, 403b301e82cSBrian Haley &sin6->sin6_addr); 404842df073SHannes Frederic Sowa sin6->sin6_scope_id = 0; 405842df073SHannes Frederic Sowa } else { 4064e3fd7a0SAlexey Dobriyan sin6->sin6_addr = ipv6_hdr(skb)->saddr; 407842df073SHannes Frederic Sowa sin6->sin6_scope_id = 408842df073SHannes Frederic Sowa ipv6_iface_scope_id(&sin6->sin6_addr, 4094330487aSDuan Jiong inet6_iif(skb)); 410db8dac20SDavid S. Miller } 411bceaa902SHannes Frederic Sowa *addr_len = sizeof(*sin6); 412983695faSDaniel Borkmann 413983695faSDaniel Borkmann if (cgroup_bpf_enabled) 414983695faSDaniel Borkmann BPF_CGROUP_RUN_PROG_UDP6_RECVMSG_LOCK(sk, 415983695faSDaniel Borkmann (struct sockaddr *)sin6); 416db8dac20SDavid S. Miller } 4174b261c75SHannes Frederic Sowa 418bcd1665eSPaolo Abeni if (udp_sk(sk)->gro_enabled) 419bcd1665eSPaolo Abeni udp_cmsg_recv(msg, sk, skb); 420bcd1665eSPaolo Abeni 4214b261c75SHannes Frederic Sowa if (np->rxopt.all) 4224b261c75SHannes Frederic Sowa ip6_datagram_recv_common_ctl(sk, msg, skb); 4234b261c75SHannes Frederic Sowa 424f26ba175SWei Yongjun if (is_udp4) { 425db8dac20SDavid S. Miller if (inet->cmsg_flags) 426ad959036SPaolo Abeni ip_cmsg_recv_offset(msg, sk, skb, 42710df8e61SEric Dumazet sizeof(struct udphdr), off); 428db8dac20SDavid S. Miller } else { 429db8dac20SDavid S. Miller if (np->rxopt.all) 4304b261c75SHannes Frederic Sowa ip6_datagram_recv_specific_ctl(sk, msg, skb); 431db8dac20SDavid S. Miller } 432db8dac20SDavid S. Miller 43359c2cdaeSDavid S. Miller err = copied; 434db8dac20SDavid S. Miller if (flags & MSG_TRUNC) 435db8dac20SDavid S. Miller err = ulen; 436db8dac20SDavid S. Miller 437850cbaddSPaolo Abeni skb_consume_udp(sk, skb, peeking ? -err : err); 438db8dac20SDavid S. Miller return err; 439db8dac20SDavid S. Miller 440db8dac20SDavid S. Miller csum_copy_err: 4412276f58aSPaolo Abeni if (!__sk_queue_drop_skb(sk, &udp_sk(sk)->reader_queue, skb, flags, 4422276f58aSPaolo Abeni udp_skb_destructor)) { 443029a3743SPaolo Abeni SNMP_INC_STATS(mib, UDP_MIB_CSUMERRORS); 444029a3743SPaolo Abeni SNMP_INC_STATS(mib, UDP_MIB_INERRORS); 4456a5dc9e5SEric Dumazet } 446850cbaddSPaolo Abeni kfree_skb(skb); 447db8dac20SDavid S. Miller 448beb39db5SEric Dumazet /* starting over for a new packet, but check if we need to yield */ 449beb39db5SEric Dumazet cond_resched(); 4509cfaa8deSXufeng Zhang msg->msg_flags &= ~MSG_TRUNC; 451db8dac20SDavid S. Miller goto try_again; 452db8dac20SDavid S. Miller } 453db8dac20SDavid S. Miller 454a36e185eSStefano Brivio DEFINE_STATIC_KEY_FALSE(udpv6_encap_needed_key); 455a36e185eSStefano Brivio void udpv6_encap_enable(void) 456a36e185eSStefano Brivio { 4579c480601SPaolo Abeni static_branch_inc(&udpv6_encap_needed_key); 458a36e185eSStefano Brivio } 459a36e185eSStefano Brivio EXPORT_SYMBOL(udpv6_encap_enable); 460a36e185eSStefano Brivio 461e7cc0824SStefano Brivio /* Handler for tunnels with arbitrary destination ports: no socket lookup, go 462e7cc0824SStefano Brivio * through error handlers in encapsulations looking for a match. 463e7cc0824SStefano Brivio */ 464e7cc0824SStefano Brivio static int __udp6_lib_err_encap_no_sk(struct sk_buff *skb, 465e7cc0824SStefano Brivio struct inet6_skb_parm *opt, 466424a7cd0SPaolo Abeni u8 type, u8 code, int offset, __be32 info) 467e7cc0824SStefano Brivio { 468e7cc0824SStefano Brivio int i; 469e7cc0824SStefano Brivio 470e7cc0824SStefano Brivio for (i = 0; i < MAX_IPTUN_ENCAP_OPS; i++) { 471e7cc0824SStefano Brivio int (*handler)(struct sk_buff *skb, struct inet6_skb_parm *opt, 472424a7cd0SPaolo Abeni u8 type, u8 code, int offset, __be32 info); 473424a7cd0SPaolo Abeni const struct ip6_tnl_encap_ops *encap; 474e7cc0824SStefano Brivio 475424a7cd0SPaolo Abeni encap = rcu_dereference(ip6tun_encaps[i]); 476424a7cd0SPaolo Abeni if (!encap) 477e7cc0824SStefano Brivio continue; 478424a7cd0SPaolo Abeni handler = encap->err_handler; 479e7cc0824SStefano Brivio if (handler && !handler(skb, opt, type, code, offset, info)) 480e7cc0824SStefano Brivio return 0; 481e7cc0824SStefano Brivio } 482e7cc0824SStefano Brivio 483e7cc0824SStefano Brivio return -ENOENT; 484e7cc0824SStefano Brivio } 485e7cc0824SStefano Brivio 486a36e185eSStefano Brivio /* Try to match ICMP errors to UDP tunnels by looking up a socket without 487a36e185eSStefano Brivio * reversing source and destination port: this will match tunnels that force the 488a36e185eSStefano Brivio * same destination port on both endpoints (e.g. VXLAN, GENEVE). Note that 489a36e185eSStefano Brivio * lwtunnels might actually break this assumption by being configured with 490a36e185eSStefano Brivio * different destination ports on endpoints, in this case we won't be able to 491a36e185eSStefano Brivio * trace ICMP messages back to them. 492a36e185eSStefano Brivio * 493e7cc0824SStefano Brivio * If this doesn't match any socket, probe tunnels with arbitrary destination 494e7cc0824SStefano Brivio * ports (e.g. FoU, GUE): there, the receiving socket is useless, as the port 495e7cc0824SStefano Brivio * we've sent packets to won't necessarily match the local destination port. 496e7cc0824SStefano Brivio * 497a36e185eSStefano Brivio * Then ask the tunnel implementation to match the error against a valid 498a36e185eSStefano Brivio * association. 499a36e185eSStefano Brivio * 500e7cc0824SStefano Brivio * Return an error if we can't find a match, the socket if we need further 501e7cc0824SStefano Brivio * processing, zero otherwise. 502a36e185eSStefano Brivio */ 503a36e185eSStefano Brivio static struct sock *__udp6_lib_err_encap(struct net *net, 504a36e185eSStefano Brivio const struct ipv6hdr *hdr, int offset, 505a36e185eSStefano Brivio struct udphdr *uh, 506a36e185eSStefano Brivio struct udp_table *udptable, 507e7cc0824SStefano Brivio struct sk_buff *skb, 508e7cc0824SStefano Brivio struct inet6_skb_parm *opt, 509e7cc0824SStefano Brivio u8 type, u8 code, __be32 info) 510a36e185eSStefano Brivio { 511a36e185eSStefano Brivio int network_offset, transport_offset; 512a36e185eSStefano Brivio struct sock *sk; 513a36e185eSStefano Brivio 514a36e185eSStefano Brivio network_offset = skb_network_offset(skb); 515a36e185eSStefano Brivio transport_offset = skb_transport_offset(skb); 516a36e185eSStefano Brivio 517a36e185eSStefano Brivio /* Network header needs to point to the outer IPv6 header inside ICMP */ 518a36e185eSStefano Brivio skb_reset_network_header(skb); 519a36e185eSStefano Brivio 520a36e185eSStefano Brivio /* Transport header needs to point to the UDP header */ 521a36e185eSStefano Brivio skb_set_transport_header(skb, offset); 522a36e185eSStefano Brivio 523e7cc0824SStefano Brivio sk = __udp6_lib_lookup(net, &hdr->daddr, uh->source, 524e7cc0824SStefano Brivio &hdr->saddr, uh->dest, 525e7cc0824SStefano Brivio inet6_iif(skb), 0, udptable, skb); 526e7cc0824SStefano Brivio if (sk) { 527e7cc0824SStefano Brivio int (*lookup)(struct sock *sk, struct sk_buff *skb); 528e7cc0824SStefano Brivio struct udp_sock *up = udp_sk(sk); 529e7cc0824SStefano Brivio 530a36e185eSStefano Brivio lookup = READ_ONCE(up->encap_err_lookup); 531a36e185eSStefano Brivio if (!lookup || lookup(sk, skb)) 532a36e185eSStefano Brivio sk = NULL; 533e7cc0824SStefano Brivio } 534e7cc0824SStefano Brivio 535e7cc0824SStefano Brivio if (!sk) { 536e7cc0824SStefano Brivio sk = ERR_PTR(__udp6_lib_err_encap_no_sk(skb, opt, type, code, 537e7cc0824SStefano Brivio offset, info)); 538e7cc0824SStefano Brivio } 539a36e185eSStefano Brivio 540a36e185eSStefano Brivio skb_set_transport_header(skb, transport_offset); 541a36e185eSStefano Brivio skb_set_network_header(skb, network_offset); 542e7cc0824SStefano Brivio 543a36e185eSStefano Brivio return sk; 544a36e185eSStefano Brivio } 545a36e185eSStefano Brivio 54632bbd879SStefano Brivio int __udp6_lib_err(struct sk_buff *skb, struct inet6_skb_parm *opt, 547d5fdd6baSBrian Haley u8 type, u8 code, int offset, __be32 info, 548645ca708SEric Dumazet struct udp_table *udptable) 549db8dac20SDavid S. Miller { 550db8dac20SDavid S. Miller struct ipv6_pinfo *np; 551b71d1d42SEric Dumazet const struct ipv6hdr *hdr = (const struct ipv6hdr *)skb->data; 552b71d1d42SEric Dumazet const struct in6_addr *saddr = &hdr->saddr; 553b71d1d42SEric Dumazet const struct in6_addr *daddr = &hdr->daddr; 554db8dac20SDavid S. Miller struct udphdr *uh = (struct udphdr *)(skb->data+offset); 555a36e185eSStefano Brivio bool tunnel = false; 556db8dac20SDavid S. Miller struct sock *sk; 557e0d8c1b7SWei Wang int harderr; 558db8dac20SDavid S. Miller int err; 5597304fe46SDuan Jiong struct net *net = dev_net(skb->dev); 560db8dac20SDavid S. Miller 561e32ea7e7SCraig Gallek sk = __udp6_lib_lookup(net, daddr, uh->dest, saddr, uh->source, 5624ac30c4bSMartin KaFai Lau inet6_iif(skb), inet6_sdif(skb), udptable, NULL); 563d26796aeSXin Long if (!sk || udp_sk(sk)->encap_type) { 564a36e185eSStefano Brivio /* No socket for error: try tunnels before discarding */ 565e7cc0824SStefano Brivio sk = ERR_PTR(-ENOENT); 566a36e185eSStefano Brivio if (static_branch_unlikely(&udpv6_encap_needed_key)) { 567a36e185eSStefano Brivio sk = __udp6_lib_err_encap(net, hdr, offset, uh, 568e7cc0824SStefano Brivio udptable, skb, 569e7cc0824SStefano Brivio opt, type, code, info); 570e7cc0824SStefano Brivio if (!sk) 571e7cc0824SStefano Brivio return 0; 572a36e185eSStefano Brivio } 573a36e185eSStefano Brivio 574e7cc0824SStefano Brivio if (IS_ERR(sk)) { 575a16292a0SEric Dumazet __ICMP6_INC_STATS(net, __in6_dev_get(skb->dev), 5767304fe46SDuan Jiong ICMP6_MIB_INERRORS); 577e7cc0824SStefano Brivio return PTR_ERR(sk); 5787304fe46SDuan Jiong } 579e7cc0824SStefano Brivio 580a36e185eSStefano Brivio tunnel = true; 581a36e185eSStefano Brivio } 582db8dac20SDavid S. Miller 583e0d8c1b7SWei Wang harderr = icmpv6_err_convert(type, code, &err); 584e0d8c1b7SWei Wang np = inet6_sk(sk); 585e0d8c1b7SWei Wang 58693b36cf3SHannes Frederic Sowa if (type == ICMPV6_PKT_TOOBIG) { 58793b36cf3SHannes Frederic Sowa if (!ip6_sk_accept_pmtu(sk)) 58893b36cf3SHannes Frederic Sowa goto out; 58981aded24SDavid S. Miller ip6_sk_update_pmtu(skb, sk, info); 590e0d8c1b7SWei Wang if (np->pmtudisc != IPV6_PMTUDISC_DONT) 591e0d8c1b7SWei Wang harderr = 1; 59293b36cf3SHannes Frederic Sowa } 5931a462d18SDuan Jiong if (type == NDISC_REDIRECT) { 594a36e185eSStefano Brivio if (tunnel) { 595a36e185eSStefano Brivio ip6_redirect(skb, sock_net(sk), inet6_iif(skb), 596a36e185eSStefano Brivio sk->sk_mark, sk->sk_uid); 597a36e185eSStefano Brivio } else { 598ec18d9a2SDavid S. Miller ip6_sk_redirect(skb, sk); 599a36e185eSStefano Brivio } 6001a462d18SDuan Jiong goto out; 6011a462d18SDuan Jiong } 60281aded24SDavid S. Miller 603a36e185eSStefano Brivio /* Tunnels don't have an application socket: don't pass errors back */ 604a36e185eSStefano Brivio if (tunnel) 605a36e185eSStefano Brivio goto out; 606a36e185eSStefano Brivio 607e0d8c1b7SWei Wang if (!np->recverr) { 608e0d8c1b7SWei Wang if (!harderr || sk->sk_state != TCP_ESTABLISHED) 609db8dac20SDavid S. Miller goto out; 610e0d8c1b7SWei Wang } else { 611db8dac20SDavid S. Miller ipv6_icmp_error(sk, skb, err, uh->dest, ntohl(info), (u8 *)(uh+1)); 612e0d8c1b7SWei Wang } 613b1faf566SEric Dumazet 614db8dac20SDavid S. Miller sk->sk_err = err; 615db8dac20SDavid S. Miller sk->sk_error_report(sk); 616db8dac20SDavid S. Miller out: 61732bbd879SStefano Brivio return 0; 618db8dac20SDavid S. Miller } 619db8dac20SDavid S. Miller 620a3f96c47SPaolo Abeni static int __udpv6_queue_rcv_skb(struct sock *sk, struct sk_buff *skb) 621f7ad74feSBenjamin LaHaise { 622f7ad74feSBenjamin LaHaise int rc; 623f7ad74feSBenjamin LaHaise 624efe4208fSEric Dumazet if (!ipv6_addr_any(&sk->sk_v6_daddr)) { 625f7ad74feSBenjamin LaHaise sock_rps_save_rxhash(sk, skb); 626005ec974SShawn Bohrer sk_mark_napi_id(sk, skb); 6272c8c56e1SEric Dumazet sk_incoming_cpu_update(sk); 628e68b6e50SEric Dumazet } else { 629e68b6e50SEric Dumazet sk_mark_napi_id_once(sk, skb); 630005ec974SShawn Bohrer } 631f7ad74feSBenjamin LaHaise 632850cbaddSPaolo Abeni rc = __udp_enqueue_schedule_skb(sk, skb); 633f7ad74feSBenjamin LaHaise if (rc < 0) { 634f7ad74feSBenjamin LaHaise int is_udplite = IS_UDPLITE(sk); 635f7ad74feSBenjamin LaHaise 636f7ad74feSBenjamin LaHaise /* Note that an ENOMEM error is charged twice */ 637f7ad74feSBenjamin LaHaise if (rc == -ENOMEM) 638e61da9e2SEric Dumazet UDP6_INC_STATS(sock_net(sk), 639f7ad74feSBenjamin LaHaise UDP_MIB_RCVBUFERRORS, is_udplite); 640a3ce2b10SMenglong Dong else 641a3ce2b10SMenglong Dong UDP6_INC_STATS(sock_net(sk), 642a3ce2b10SMenglong Dong UDP_MIB_MEMERRORS, is_udplite); 643e61da9e2SEric Dumazet UDP6_INC_STATS(sock_net(sk), UDP_MIB_INERRORS, is_udplite); 644f7ad74feSBenjamin LaHaise kfree_skb(skb); 645f7ad74feSBenjamin LaHaise return -1; 646f7ad74feSBenjamin LaHaise } 647850cbaddSPaolo Abeni 648f7ad74feSBenjamin LaHaise return 0; 649f7ad74feSBenjamin LaHaise } 650f7ad74feSBenjamin LaHaise 65132bbd879SStefano Brivio static __inline__ int udpv6_err(struct sk_buff *skb, 652d5fdd6baSBrian Haley struct inet6_skb_parm *opt, u8 type, 653d5fdd6baSBrian Haley u8 code, int offset, __be32 info) 654db8dac20SDavid S. Miller { 65532bbd879SStefano Brivio return __udp6_lib_err(skb, opt, type, code, offset, info, &udp_table); 656db8dac20SDavid S. Miller } 657db8dac20SDavid S. Miller 658cf329aa4SPaolo Abeni static int udpv6_queue_rcv_one_skb(struct sock *sk, struct sk_buff *skb) 659db8dac20SDavid S. Miller { 660db8dac20SDavid S. Miller struct udp_sock *up = udp_sk(sk); 661db8dac20SDavid S. Miller int is_udplite = IS_UDPLITE(sk); 662db8dac20SDavid S. Miller 663db8dac20SDavid S. Miller if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb)) 664db8dac20SDavid S. Miller goto drop; 665db8dac20SDavid S. Miller 66688ab3108SDavidlohr Bueso if (static_branch_unlikely(&udpv6_encap_needed_key) && up->encap_type) { 667d7f3f621SBenjamin LaHaise int (*encap_rcv)(struct sock *sk, struct sk_buff *skb); 668d7f3f621SBenjamin LaHaise 669d7f3f621SBenjamin LaHaise /* 670d7f3f621SBenjamin LaHaise * This is an encapsulation socket so pass the skb to 671d7f3f621SBenjamin LaHaise * the socket's udp_encap_rcv() hook. Otherwise, just 672d7f3f621SBenjamin LaHaise * fall through and pass this up the UDP socket. 673d7f3f621SBenjamin LaHaise * up->encap_rcv() returns the following value: 674d7f3f621SBenjamin LaHaise * =0 if skb was successfully passed to the encap 675d7f3f621SBenjamin LaHaise * handler or was discarded by it. 676d7f3f621SBenjamin LaHaise * >0 if skb should be passed on to UDP. 677d7f3f621SBenjamin LaHaise * <0 if skb should be resubmitted as proto -N 678d7f3f621SBenjamin LaHaise */ 679d7f3f621SBenjamin LaHaise 680d7f3f621SBenjamin LaHaise /* if we're overly short, let UDP handle it */ 6816aa7de05SMark Rutland encap_rcv = READ_ONCE(up->encap_rcv); 682e5aed006SHannes Frederic Sowa if (encap_rcv) { 683d7f3f621SBenjamin LaHaise int ret; 684d7f3f621SBenjamin LaHaise 6850a80966bSTom Herbert /* Verify checksum before giving to encap */ 6860a80966bSTom Herbert if (udp_lib_checksum_complete(skb)) 6870a80966bSTom Herbert goto csum_error; 6880a80966bSTom Herbert 689d7f3f621SBenjamin LaHaise ret = encap_rcv(sk, skb); 690d7f3f621SBenjamin LaHaise if (ret <= 0) { 69102c22347SEric Dumazet __UDP_INC_STATS(sock_net(sk), 692d7f3f621SBenjamin LaHaise UDP_MIB_INDATAGRAMS, 693d7f3f621SBenjamin LaHaise is_udplite); 694d7f3f621SBenjamin LaHaise return -ret; 695d7f3f621SBenjamin LaHaise } 696d7f3f621SBenjamin LaHaise } 697d7f3f621SBenjamin LaHaise 698d7f3f621SBenjamin LaHaise /* FALLTHROUGH -- it's a UDP Packet */ 699d7f3f621SBenjamin LaHaise } 700d7f3f621SBenjamin LaHaise 701db8dac20SDavid S. Miller /* 702db8dac20SDavid S. Miller * UDP-Lite specific tests, ignored on UDP sockets (see net/ipv4/udp.c). 703db8dac20SDavid S. Miller */ 704b0a42277SMiaohe Lin if ((up->pcflag & UDPLITE_RECV_CC) && UDP_SKB_CB(skb)->partial_cov) { 705db8dac20SDavid S. Miller 706db8dac20SDavid S. Miller if (up->pcrlen == 0) { /* full coverage was set */ 707ba7a46f1SJoe Perches net_dbg_ratelimited("UDPLITE6: partial coverage %d while full coverage %d requested\n", 708db8dac20SDavid S. Miller UDP_SKB_CB(skb)->cscov, skb->len); 709db8dac20SDavid S. Miller goto drop; 710db8dac20SDavid S. Miller } 711db8dac20SDavid S. Miller if (UDP_SKB_CB(skb)->cscov < up->pcrlen) { 712ba7a46f1SJoe Perches net_dbg_ratelimited("UDPLITE6: coverage %d too small, need min %d\n", 713db8dac20SDavid S. Miller UDP_SKB_CB(skb)->cscov, up->pcrlen); 714db8dac20SDavid S. Miller goto drop; 715db8dac20SDavid S. Miller } 716db8dac20SDavid S. Miller } 717db8dac20SDavid S. Miller 7184b943faeSPaolo Abeni prefetch(&sk->sk_rmem_alloc); 719ce25d66aSEric Dumazet if (rcu_access_pointer(sk->sk_filter) && 720ce25d66aSEric Dumazet udp_lib_checksum_complete(skb)) 7216a5dc9e5SEric Dumazet goto csum_error; 722ce25d66aSEric Dumazet 723ba66bbe5SDaniel Borkmann if (sk_filter_trim_cap(sk, skb, sizeof(struct udphdr))) 724a6127697SMichal Kubeček goto drop; 725db8dac20SDavid S. Miller 726e6afc8acSsamanthakumar udp_csum_pull_header(skb); 727cb80ef46SBenjamin LaHaise 728d826eb14SEric Dumazet skb_dst_drop(skb); 729db8dac20SDavid S. Miller 730850cbaddSPaolo Abeni return __udpv6_queue_rcv_skb(sk, skb); 7313e215c8dSJames M Leddy 7326a5dc9e5SEric Dumazet csum_error: 73302c22347SEric Dumazet __UDP6_INC_STATS(sock_net(sk), UDP_MIB_CSUMERRORS, is_udplite); 734db8dac20SDavid S. Miller drop: 73502c22347SEric Dumazet __UDP6_INC_STATS(sock_net(sk), UDP_MIB_INERRORS, is_udplite); 736cb80ef46SBenjamin LaHaise atomic_inc(&sk->sk_drops); 737db8dac20SDavid S. Miller kfree_skb(skb); 738db8dac20SDavid S. Miller return -1; 739db8dac20SDavid S. Miller } 740db8dac20SDavid S. Miller 741cf329aa4SPaolo Abeni static int udpv6_queue_rcv_skb(struct sock *sk, struct sk_buff *skb) 742cf329aa4SPaolo Abeni { 743cf329aa4SPaolo Abeni struct sk_buff *next, *segs; 744cf329aa4SPaolo Abeni int ret; 745cf329aa4SPaolo Abeni 746cf329aa4SPaolo Abeni if (likely(!udp_unexpected_gso(sk, skb))) 747cf329aa4SPaolo Abeni return udpv6_queue_rcv_one_skb(sk, skb); 748cf329aa4SPaolo Abeni 749cf329aa4SPaolo Abeni __skb_push(skb, -skb_mac_offset(skb)); 750cf329aa4SPaolo Abeni segs = udp_rcv_segment(sk, skb, false); 7511a186c14SJason A. Donenfeld skb_list_walk_safe(segs, skb, next) { 752cf329aa4SPaolo Abeni __skb_pull(skb, skb_transport_offset(skb)); 753cf329aa4SPaolo Abeni 754cf329aa4SPaolo Abeni ret = udpv6_queue_rcv_one_skb(sk, skb); 755cf329aa4SPaolo Abeni if (ret > 0) 756cf329aa4SPaolo Abeni ip6_protocol_deliver_rcu(dev_net(skb->dev), skb, ret, 757cf329aa4SPaolo Abeni true); 758cf329aa4SPaolo Abeni } 759cf329aa4SPaolo Abeni return 0; 760cf329aa4SPaolo Abeni } 761cf329aa4SPaolo Abeni 7625cf3d461SDavid Held static bool __udp_v6_is_mcast_sock(struct net *net, struct sock *sk, 763b71d1d42SEric Dumazet __be16 loc_port, const struct in6_addr *loc_addr, 764b71d1d42SEric Dumazet __be16 rmt_port, const struct in6_addr *rmt_addr, 7657bd2db40SDewi Morgan int dif, int sdif, unsigned short hnum) 766db8dac20SDavid S. Miller { 7679e89fd8bSSven Wegener struct inet_sock *inet = inet_sk(sk); 768db8dac20SDavid S. Miller 7699e89fd8bSSven Wegener if (!net_eq(sock_net(sk), net)) 7705cf3d461SDavid Held return false; 771b8ad0cbcSDaniel Lezcano 7725cf3d461SDavid Held if (udp_sk(sk)->udp_port_hash != hnum || 7735cf3d461SDavid Held sk->sk_family != PF_INET6 || 7745cf3d461SDavid Held (inet->inet_dport && inet->inet_dport != rmt_port) || 7755cf3d461SDavid Held (!ipv6_addr_any(&sk->sk_v6_daddr) && 7765cf3d461SDavid Held !ipv6_addr_equal(&sk->sk_v6_daddr, rmt_addr)) || 7777bd2db40SDewi Morgan !udp_sk_bound_dev_eq(net, sk->sk_bound_dev_if, dif, sdif) || 77833b4b015SHenning Rogge (!ipv6_addr_any(&sk->sk_v6_rcv_saddr) && 77933b4b015SHenning Rogge !ipv6_addr_equal(&sk->sk_v6_rcv_saddr, loc_addr))) 7805cf3d461SDavid Held return false; 7819e89fd8bSSven Wegener if (!inet6_mc_check(sk, loc_addr, rmt_addr)) 7825cf3d461SDavid Held return false; 7835cf3d461SDavid Held return true; 784db8dac20SDavid S. Miller } 785db8dac20SDavid S. Miller 7864068579eSTom Herbert static void udp6_csum_zero_error(struct sk_buff *skb) 7874068579eSTom Herbert { 7884068579eSTom Herbert /* RFC 2460 section 8.1 says that we SHOULD log 7894068579eSTom Herbert * this error. Well, it is reasonable. 7904068579eSTom Herbert */ 791ba7a46f1SJoe Perches net_dbg_ratelimited("IPv6: udp checksum is 0 for [%pI6c]:%u->[%pI6c]:%u\n", 7924068579eSTom Herbert &ipv6_hdr(skb)->saddr, ntohs(udp_hdr(skb)->source), 7934068579eSTom Herbert &ipv6_hdr(skb)->daddr, ntohs(udp_hdr(skb)->dest)); 7944068579eSTom Herbert } 7954068579eSTom Herbert 796db8dac20SDavid S. Miller /* 797db8dac20SDavid S. Miller * Note: called only from the BH handler context, 798db8dac20SDavid S. Miller * so we don't need to lock the hashes. 799db8dac20SDavid S. Miller */ 800e3163493SPavel Emelyanov static int __udp6_lib_mcast_deliver(struct net *net, struct sk_buff *skb, 801b71d1d42SEric Dumazet const struct in6_addr *saddr, const struct in6_addr *daddr, 80236cbb245SRick Jones struct udp_table *udptable, int proto) 803db8dac20SDavid S. Miller { 804ca065d0cSEric Dumazet struct sock *sk, *first = NULL; 805db8dac20SDavid S. Miller const struct udphdr *uh = udp_hdr(skb); 8065cf3d461SDavid Held unsigned short hnum = ntohs(uh->dest); 8075cf3d461SDavid Held struct udp_hslot *hslot = udp_hashslot(udptable, net, hnum); 808ca065d0cSEric Dumazet unsigned int offset = offsetof(typeof(*sk), sk_node); 8092dc41cffSDavid Held unsigned int hash2 = 0, hash2_any = 0, use_hash2 = (hslot->count > 10); 810ca065d0cSEric Dumazet int dif = inet6_iif(skb); 8117bd2db40SDewi Morgan int sdif = inet6_sdif(skb); 812ca065d0cSEric Dumazet struct hlist_node *node; 813ca065d0cSEric Dumazet struct sk_buff *nskb; 8142dc41cffSDavid Held 8152dc41cffSDavid Held if (use_hash2) { 816f0b1e64cSMartin KaFai Lau hash2_any = ipv6_portaddr_hash(net, &in6addr_any, hnum) & 81773e2d5e3SPablo Neira udptable->mask; 818f0b1e64cSMartin KaFai Lau hash2 = ipv6_portaddr_hash(net, daddr, hnum) & udptable->mask; 8192dc41cffSDavid Held start_lookup: 82073e2d5e3SPablo Neira hslot = &udptable->hash2[hash2]; 8212dc41cffSDavid Held offset = offsetof(typeof(*sk), __sk_common.skc_portaddr_node); 8222dc41cffSDavid Held } 823db8dac20SDavid S. Miller 824ca065d0cSEric Dumazet sk_for_each_entry_offset_rcu(sk, node, &hslot->head, offset) { 825ca065d0cSEric Dumazet if (!__udp_v6_is_mcast_sock(net, sk, uh->dest, daddr, 8267bd2db40SDewi Morgan uh->source, saddr, dif, sdif, 8277bd2db40SDewi Morgan hnum)) 828ca065d0cSEric Dumazet continue; 8291c19448cSTom Herbert /* If zero checksum and no_check is not on for 8304068579eSTom Herbert * the socket then skip it. 8314068579eSTom Herbert */ 832ca065d0cSEric Dumazet if (!uh->check && !udp_sk(sk)->no_check6_rx) 833ca065d0cSEric Dumazet continue; 834ca065d0cSEric Dumazet if (!first) { 835ca065d0cSEric Dumazet first = sk; 836ca065d0cSEric Dumazet continue; 837db8dac20SDavid S. Miller } 838ca065d0cSEric Dumazet nskb = skb_clone(skb, GFP_ATOMIC); 839ca065d0cSEric Dumazet if (unlikely(!nskb)) { 840ca065d0cSEric Dumazet atomic_inc(&sk->sk_drops); 84102c22347SEric Dumazet __UDP6_INC_STATS(net, UDP_MIB_RCVBUFERRORS, 842ca065d0cSEric Dumazet IS_UDPLITE(sk)); 84302c22347SEric Dumazet __UDP6_INC_STATS(net, UDP_MIB_INERRORS, 844ca065d0cSEric Dumazet IS_UDPLITE(sk)); 845ca065d0cSEric Dumazet continue; 846a1ab77f9SEric Dumazet } 847db8dac20SDavid S. Miller 848ca065d0cSEric Dumazet if (udpv6_queue_rcv_skb(sk, nskb) > 0) 849ca065d0cSEric Dumazet consume_skb(nskb); 850ca065d0cSEric Dumazet } 851a1ab77f9SEric Dumazet 8522dc41cffSDavid Held /* Also lookup *:port if we are using hash2 and haven't done so yet. */ 8532dc41cffSDavid Held if (use_hash2 && hash2 != hash2_any) { 8542dc41cffSDavid Held hash2 = hash2_any; 8552dc41cffSDavid Held goto start_lookup; 8562dc41cffSDavid Held } 8572dc41cffSDavid Held 858ca065d0cSEric Dumazet if (first) { 859ca065d0cSEric Dumazet if (udpv6_queue_rcv_skb(first, skb) > 0) 860ca065d0cSEric Dumazet consume_skb(skb); 861a1ab77f9SEric Dumazet } else { 862ca065d0cSEric Dumazet kfree_skb(skb); 86302c22347SEric Dumazet __UDP6_INC_STATS(net, UDP_MIB_IGNOREDMULTI, 86436cbb245SRick Jones proto == IPPROTO_UDPLITE); 865a1ab77f9SEric Dumazet } 866db8dac20SDavid S. Miller return 0; 867db8dac20SDavid S. Miller } 868db8dac20SDavid S. Miller 86964f0f5d1SPaolo Abeni static void udp6_sk_rx_dst_set(struct sock *sk, struct dst_entry *dst) 87064f0f5d1SPaolo Abeni { 87164f0f5d1SPaolo Abeni if (udp_sk_rx_dst_set(sk, dst)) { 87264f0f5d1SPaolo Abeni const struct rt6_info *rt = (const struct rt6_info *)dst; 87364f0f5d1SPaolo Abeni 87464f0f5d1SPaolo Abeni inet6_sk(sk)->rx_dst_cookie = rt6_get_cookie(rt); 87564f0f5d1SPaolo Abeni } 87664f0f5d1SPaolo Abeni } 87764f0f5d1SPaolo Abeni 878eb63f296SPaolo Abeni /* wrapper for udp_queue_rcv_skb tacking care of csum conversion and 879eb63f296SPaolo Abeni * return code conversion for ip layer consumption 880eb63f296SPaolo Abeni */ 881eb63f296SPaolo Abeni static int udp6_unicast_rcv_skb(struct sock *sk, struct sk_buff *skb, 882eb63f296SPaolo Abeni struct udphdr *uh) 883eb63f296SPaolo Abeni { 884eb63f296SPaolo Abeni int ret; 885eb63f296SPaolo Abeni 886eb63f296SPaolo Abeni if (inet_get_convert_csum(sk) && uh->check && !IS_UDPLITE(sk)) 887e4aa33adSLi RongQing skb_checksum_try_convert(skb, IPPROTO_UDP, ip6_compute_pseudo); 888eb63f296SPaolo Abeni 889eb63f296SPaolo Abeni ret = udpv6_queue_rcv_skb(sk, skb); 890eb63f296SPaolo Abeni 89184dad559SPaolo Abeni /* a return value > 0 means to resubmit the input */ 892eb63f296SPaolo Abeni if (ret > 0) 89384dad559SPaolo Abeni return ret; 894eb63f296SPaolo Abeni return 0; 895eb63f296SPaolo Abeni } 896eb63f296SPaolo Abeni 897645ca708SEric Dumazet int __udp6_lib_rcv(struct sk_buff *skb, struct udp_table *udptable, 898db8dac20SDavid S. Miller int proto) 899db8dac20SDavid S. Miller { 900b71d1d42SEric Dumazet const struct in6_addr *saddr, *daddr; 901ca065d0cSEric Dumazet struct net *net = dev_net(skb->dev); 902ca065d0cSEric Dumazet struct udphdr *uh; 903ca065d0cSEric Dumazet struct sock *sk; 90471489e21SJoe Stringer bool refcounted; 905db8dac20SDavid S. Miller u32 ulen = 0; 906db8dac20SDavid S. Miller 907db8dac20SDavid S. Miller if (!pskb_may_pull(skb, sizeof(struct udphdr))) 908d6bc0149SBjørn Mork goto discard; 909db8dac20SDavid S. Miller 910db8dac20SDavid S. Miller saddr = &ipv6_hdr(skb)->saddr; 911db8dac20SDavid S. Miller daddr = &ipv6_hdr(skb)->daddr; 912db8dac20SDavid S. Miller uh = udp_hdr(skb); 913db8dac20SDavid S. Miller 914db8dac20SDavid S. Miller ulen = ntohs(uh->len); 915db8dac20SDavid S. Miller if (ulen > skb->len) 916db8dac20SDavid S. Miller goto short_packet; 917db8dac20SDavid S. Miller 918db8dac20SDavid S. Miller if (proto == IPPROTO_UDP) { 919db8dac20SDavid S. Miller /* UDP validates ulen. */ 920db8dac20SDavid S. Miller 921db8dac20SDavid S. Miller /* Check for jumbo payload */ 922db8dac20SDavid S. Miller if (ulen == 0) 923db8dac20SDavid S. Miller ulen = skb->len; 924db8dac20SDavid S. Miller 925db8dac20SDavid S. Miller if (ulen < sizeof(*uh)) 926db8dac20SDavid S. Miller goto short_packet; 927db8dac20SDavid S. Miller 928db8dac20SDavid S. Miller if (ulen < skb->len) { 929db8dac20SDavid S. Miller if (pskb_trim_rcsum(skb, ulen)) 930db8dac20SDavid S. Miller goto short_packet; 931db8dac20SDavid S. Miller saddr = &ipv6_hdr(skb)->saddr; 932db8dac20SDavid S. Miller daddr = &ipv6_hdr(skb)->daddr; 933db8dac20SDavid S. Miller uh = udp_hdr(skb); 934db8dac20SDavid S. Miller } 935db8dac20SDavid S. Miller } 936db8dac20SDavid S. Miller 937db8dac20SDavid S. Miller if (udp6_csum_init(skb, uh, proto)) 9386a5dc9e5SEric Dumazet goto csum_error; 939db8dac20SDavid S. Miller 940c9f2c1aeSPaolo Abeni /* Check if the socket is already available, e.g. due to early demux */ 94171489e21SJoe Stringer sk = skb_steal_sock(skb, &refcounted); 942c9f2c1aeSPaolo Abeni if (sk) { 943c9f2c1aeSPaolo Abeni struct dst_entry *dst = skb_dst(skb); 944c9f2c1aeSPaolo Abeni int ret; 945c9f2c1aeSPaolo Abeni 946c9f2c1aeSPaolo Abeni if (unlikely(sk->sk_rx_dst != dst)) 94764f0f5d1SPaolo Abeni udp6_sk_rx_dst_set(sk, dst); 948c9f2c1aeSPaolo Abeni 949eb63f296SPaolo Abeni if (!uh->check && !udp_sk(sk)->no_check6_rx) { 95071489e21SJoe Stringer if (refcounted) 951c9f2c1aeSPaolo Abeni sock_put(sk); 952eb63f296SPaolo Abeni goto report_csum_error; 953eb63f296SPaolo Abeni } 954c9f2c1aeSPaolo Abeni 955eb63f296SPaolo Abeni ret = udp6_unicast_rcv_skb(sk, skb, uh); 95671489e21SJoe Stringer if (refcounted) 957eb63f296SPaolo Abeni sock_put(sk); 958c9f2c1aeSPaolo Abeni return ret; 959c9f2c1aeSPaolo Abeni } 960c9f2c1aeSPaolo Abeni 961db8dac20SDavid S. Miller /* 962db8dac20SDavid S. Miller * Multicast receive code 963db8dac20SDavid S. Miller */ 964db8dac20SDavid S. Miller if (ipv6_addr_is_multicast(daddr)) 965e3163493SPavel Emelyanov return __udp6_lib_mcast_deliver(net, skb, 96636cbb245SRick Jones saddr, daddr, udptable, proto); 967db8dac20SDavid S. Miller 968db8dac20SDavid S. Miller /* Unicast */ 969607c4aafSKOVACS Krisztian sk = __udp6_lib_lookup_skb(skb, uh->source, uh->dest, udptable); 97053b24b8fSIan Morris if (sk) { 971eb63f296SPaolo Abeni if (!uh->check && !udp_sk(sk)->no_check6_rx) 972eb63f296SPaolo Abeni goto report_csum_error; 973eb63f296SPaolo Abeni return udp6_unicast_rcv_skb(sk, skb, uh); 9744068579eSTom Herbert } 9754068579eSTom Herbert 976eb63f296SPaolo Abeni if (!uh->check) 977eb63f296SPaolo Abeni goto report_csum_error; 9784068579eSTom Herbert 979db8dac20SDavid S. Miller if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) 980db8dac20SDavid S. Miller goto discard; 981db8dac20SDavid S. Miller 982db8dac20SDavid S. Miller if (udp_lib_checksum_complete(skb)) 9836a5dc9e5SEric Dumazet goto csum_error; 984db8dac20SDavid S. Miller 98502c22347SEric Dumazet __UDP6_INC_STATS(net, UDP_MIB_NOPORTS, proto == IPPROTO_UDPLITE); 9863ffe533cSAlexey Dobriyan icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0); 987db8dac20SDavid S. Miller 988db8dac20SDavid S. Miller kfree_skb(skb); 989db8dac20SDavid S. Miller return 0; 990db8dac20SDavid S. Miller 991db8dac20SDavid S. Miller short_packet: 992ba7a46f1SJoe Perches net_dbg_ratelimited("UDP%sv6: short packet: From [%pI6c]:%u %d/%d to [%pI6c]:%u\n", 993db8dac20SDavid S. Miller proto == IPPROTO_UDPLITE ? "-Lite" : "", 994ba7a46f1SJoe Perches saddr, ntohs(uh->source), 995ba7a46f1SJoe Perches ulen, skb->len, 996ba7a46f1SJoe Perches daddr, ntohs(uh->dest)); 9976a5dc9e5SEric Dumazet goto discard; 998eb63f296SPaolo Abeni 999eb63f296SPaolo Abeni report_csum_error: 1000eb63f296SPaolo Abeni udp6_csum_zero_error(skb); 10016a5dc9e5SEric Dumazet csum_error: 100202c22347SEric Dumazet __UDP6_INC_STATS(net, UDP_MIB_CSUMERRORS, proto == IPPROTO_UDPLITE); 1003db8dac20SDavid S. Miller discard: 100402c22347SEric Dumazet __UDP6_INC_STATS(net, UDP_MIB_INERRORS, proto == IPPROTO_UDPLITE); 1005db8dac20SDavid S. Miller kfree_skb(skb); 1006db8dac20SDavid S. Miller return 0; 1007db8dac20SDavid S. Miller } 1008db8dac20SDavid S. Miller 10090bd84065Ssubashab@codeaurora.org 10105425077dSsubashab@codeaurora.org static struct sock *__udp6_lib_demux_lookup(struct net *net, 10115425077dSsubashab@codeaurora.org __be16 loc_port, const struct in6_addr *loc_addr, 10125425077dSsubashab@codeaurora.org __be16 rmt_port, const struct in6_addr *rmt_addr, 10134297a0efSDavid Ahern int dif, int sdif) 10145425077dSsubashab@codeaurora.org { 10150bd84065Ssubashab@codeaurora.org unsigned short hnum = ntohs(loc_port); 1016f0b1e64cSMartin KaFai Lau unsigned int hash2 = ipv6_portaddr_hash(net, loc_addr, hnum); 10170bd84065Ssubashab@codeaurora.org unsigned int slot2 = hash2 & udp_table.mask; 10180bd84065Ssubashab@codeaurora.org struct udp_hslot *hslot2 = &udp_table.hash2[slot2]; 10190bd84065Ssubashab@codeaurora.org const __portpair ports = INET_COMBINED_PORTS(rmt_port, hnum); 10205425077dSsubashab@codeaurora.org struct sock *sk; 10215425077dSsubashab@codeaurora.org 10220bd84065Ssubashab@codeaurora.org udp_portaddr_for_each_entry_rcu(sk, &hslot2->head) { 102385cb73ffSWei Wang if (sk->sk_state == TCP_ESTABLISHED && 10244297a0efSDavid Ahern INET6_MATCH(sk, net, rmt_addr, loc_addr, ports, dif, sdif)) 10255425077dSsubashab@codeaurora.org return sk; 10260bd84065Ssubashab@codeaurora.org /* Only check first socket in chain */ 10270bd84065Ssubashab@codeaurora.org break; 10280bd84065Ssubashab@codeaurora.org } 10290bd84065Ssubashab@codeaurora.org return NULL; 10305425077dSsubashab@codeaurora.org } 10315425077dSsubashab@codeaurora.org 103297ff7ffbSPaolo Abeni INDIRECT_CALLABLE_SCOPE void udp_v6_early_demux(struct sk_buff *skb) 10335425077dSsubashab@codeaurora.org { 10345425077dSsubashab@codeaurora.org struct net *net = dev_net(skb->dev); 10355425077dSsubashab@codeaurora.org const struct udphdr *uh; 10365425077dSsubashab@codeaurora.org struct sock *sk; 10375425077dSsubashab@codeaurora.org struct dst_entry *dst; 10385425077dSsubashab@codeaurora.org int dif = skb->dev->ifindex; 10394297a0efSDavid Ahern int sdif = inet6_sdif(skb); 10405425077dSsubashab@codeaurora.org 10415425077dSsubashab@codeaurora.org if (!pskb_may_pull(skb, skb_transport_offset(skb) + 10425425077dSsubashab@codeaurora.org sizeof(struct udphdr))) 10435425077dSsubashab@codeaurora.org return; 10445425077dSsubashab@codeaurora.org 10455425077dSsubashab@codeaurora.org uh = udp_hdr(skb); 10465425077dSsubashab@codeaurora.org 10475425077dSsubashab@codeaurora.org if (skb->pkt_type == PACKET_HOST) 10485425077dSsubashab@codeaurora.org sk = __udp6_lib_demux_lookup(net, uh->dest, 10495425077dSsubashab@codeaurora.org &ipv6_hdr(skb)->daddr, 10505425077dSsubashab@codeaurora.org uh->source, &ipv6_hdr(skb)->saddr, 10514297a0efSDavid Ahern dif, sdif); 10525425077dSsubashab@codeaurora.org else 10535425077dSsubashab@codeaurora.org return; 10545425077dSsubashab@codeaurora.org 105541c6d650SReshetova, Elena if (!sk || !refcount_inc_not_zero(&sk->sk_refcnt)) 10565425077dSsubashab@codeaurora.org return; 10575425077dSsubashab@codeaurora.org 10585425077dSsubashab@codeaurora.org skb->sk = sk; 10595425077dSsubashab@codeaurora.org skb->destructor = sock_efree; 10605425077dSsubashab@codeaurora.org dst = READ_ONCE(sk->sk_rx_dst); 10615425077dSsubashab@codeaurora.org 10625425077dSsubashab@codeaurora.org if (dst) 10635425077dSsubashab@codeaurora.org dst = dst_check(dst, inet6_sk(sk)->rx_dst_cookie); 10645425077dSsubashab@codeaurora.org if (dst) { 1065d24406c8SWei Wang /* set noref for now. 1066d24406c8SWei Wang * any place which wants to hold dst has to call 1067d24406c8SWei Wang * dst_hold_safe() 1068d24406c8SWei Wang */ 10695425077dSsubashab@codeaurora.org skb_dst_set_noref(skb, dst); 10705425077dSsubashab@codeaurora.org } 10715425077dSsubashab@codeaurora.org } 10725425077dSsubashab@codeaurora.org 10730e219ae4SPaolo Abeni INDIRECT_CALLABLE_SCOPE int udpv6_rcv(struct sk_buff *skb) 1074db8dac20SDavid S. Miller { 1075645ca708SEric Dumazet return __udp6_lib_rcv(skb, &udp_table, IPPROTO_UDP); 1076db8dac20SDavid S. Miller } 1077db8dac20SDavid S. Miller 1078db8dac20SDavid S. Miller /* 1079db8dac20SDavid S. Miller * Throw away all pending data and cancel the corking. Socket is locked. 1080db8dac20SDavid S. Miller */ 1081db8dac20SDavid S. Miller static void udp_v6_flush_pending_frames(struct sock *sk) 1082db8dac20SDavid S. Miller { 1083db8dac20SDavid S. Miller struct udp_sock *up = udp_sk(sk); 1084db8dac20SDavid S. Miller 108536d926b9SDenis V. Lunev if (up->pending == AF_INET) 108636d926b9SDenis V. Lunev udp_flush_pending_frames(sk); 108736d926b9SDenis V. Lunev else if (up->pending) { 1088db8dac20SDavid S. Miller up->len = 0; 1089db8dac20SDavid S. Miller up->pending = 0; 1090db8dac20SDavid S. Miller ip6_flush_pending_frames(sk); 1091db8dac20SDavid S. Miller } 1092db8dac20SDavid S. Miller } 1093db8dac20SDavid S. Miller 1094d74bad4eSAndrey Ignatov static int udpv6_pre_connect(struct sock *sk, struct sockaddr *uaddr, 1095d74bad4eSAndrey Ignatov int addr_len) 1096d74bad4eSAndrey Ignatov { 1097bddc028aSTetsuo Handa if (addr_len < offsetofend(struct sockaddr, sa_family)) 1098bddc028aSTetsuo Handa return -EINVAL; 1099d74bad4eSAndrey Ignatov /* The following checks are replicated from __ip6_datagram_connect() 1100d74bad4eSAndrey Ignatov * and intended to prevent BPF program called below from accessing 1101d74bad4eSAndrey Ignatov * bytes that are out of the bound specified by user in addr_len. 1102d74bad4eSAndrey Ignatov */ 1103d74bad4eSAndrey Ignatov if (uaddr->sa_family == AF_INET) { 1104d74bad4eSAndrey Ignatov if (__ipv6_only_sock(sk)) 1105d74bad4eSAndrey Ignatov return -EAFNOSUPPORT; 1106d74bad4eSAndrey Ignatov return udp_pre_connect(sk, uaddr, addr_len); 1107d74bad4eSAndrey Ignatov } 1108d74bad4eSAndrey Ignatov 1109d74bad4eSAndrey Ignatov if (addr_len < SIN6_LEN_RFC2133) 1110d74bad4eSAndrey Ignatov return -EINVAL; 1111d74bad4eSAndrey Ignatov 1112d74bad4eSAndrey Ignatov return BPF_CGROUP_RUN_PROG_INET6_CONNECT_LOCK(sk, uaddr); 1113d74bad4eSAndrey Ignatov } 1114d74bad4eSAndrey Ignatov 1115493c6be3SSridhar Samudrala /** 1116493c6be3SSridhar Samudrala * udp6_hwcsum_outgoing - handle outgoing HW checksumming 1117493c6be3SSridhar Samudrala * @sk: socket we are sending on 1118493c6be3SSridhar Samudrala * @skb: sk_buff containing the filled-in UDP header 1119493c6be3SSridhar Samudrala * (checksum field must be zeroed out) 1120b51cd7c8SAndrew Lunn * @saddr: source address 1121b51cd7c8SAndrew Lunn * @daddr: destination address 1122b51cd7c8SAndrew Lunn * @len: length of packet 1123493c6be3SSridhar Samudrala */ 1124493c6be3SSridhar Samudrala static void udp6_hwcsum_outgoing(struct sock *sk, struct sk_buff *skb, 1125493c6be3SSridhar Samudrala const struct in6_addr *saddr, 1126493c6be3SSridhar Samudrala const struct in6_addr *daddr, int len) 1127493c6be3SSridhar Samudrala { 1128493c6be3SSridhar Samudrala unsigned int offset; 1129493c6be3SSridhar Samudrala struct udphdr *uh = udp_hdr(skb); 1130d39d938cSVlad Yasevich struct sk_buff *frags = skb_shinfo(skb)->frag_list; 1131493c6be3SSridhar Samudrala __wsum csum = 0; 1132493c6be3SSridhar Samudrala 1133d39d938cSVlad Yasevich if (!frags) { 1134493c6be3SSridhar Samudrala /* Only one fragment on the socket. */ 1135493c6be3SSridhar Samudrala skb->csum_start = skb_transport_header(skb) - skb->head; 1136493c6be3SSridhar Samudrala skb->csum_offset = offsetof(struct udphdr, check); 1137493c6be3SSridhar Samudrala uh->check = ~csum_ipv6_magic(saddr, daddr, len, IPPROTO_UDP, 0); 1138493c6be3SSridhar Samudrala } else { 1139493c6be3SSridhar Samudrala /* 1140493c6be3SSridhar Samudrala * HW-checksum won't work as there are two or more 1141493c6be3SSridhar Samudrala * fragments on the socket so that all csums of sk_buffs 1142493c6be3SSridhar Samudrala * should be together 1143493c6be3SSridhar Samudrala */ 1144493c6be3SSridhar Samudrala offset = skb_transport_offset(skb); 1145493c6be3SSridhar Samudrala skb->csum = skb_checksum(skb, offset, skb->len - offset, 0); 114663ecc3d9SSubash Abhinov Kasiviswanathan csum = skb->csum; 1147493c6be3SSridhar Samudrala 1148493c6be3SSridhar Samudrala skb->ip_summed = CHECKSUM_NONE; 1149493c6be3SSridhar Samudrala 1150d39d938cSVlad Yasevich do { 1151d39d938cSVlad Yasevich csum = csum_add(csum, frags->csum); 1152d39d938cSVlad Yasevich } while ((frags = frags->next)); 1153493c6be3SSridhar Samudrala 1154493c6be3SSridhar Samudrala uh->check = csum_ipv6_magic(saddr, daddr, len, IPPROTO_UDP, 1155493c6be3SSridhar Samudrala csum); 1156493c6be3SSridhar Samudrala if (uh->check == 0) 1157493c6be3SSridhar Samudrala uh->check = CSUM_MANGLED_0; 1158493c6be3SSridhar Samudrala } 1159493c6be3SSridhar Samudrala } 1160493c6be3SSridhar Samudrala 1161db8dac20SDavid S. Miller /* 1162db8dac20SDavid S. Miller * Sending 1163db8dac20SDavid S. Miller */ 1164db8dac20SDavid S. Miller 1165bec1f6f6SWillem de Bruijn static int udp_v6_send_skb(struct sk_buff *skb, struct flowi6 *fl6, 1166bec1f6f6SWillem de Bruijn struct inet_cork *cork) 1167db8dac20SDavid S. Miller { 1168d39d938cSVlad Yasevich struct sock *sk = skb->sk; 1169db8dac20SDavid S. Miller struct udphdr *uh; 1170db8dac20SDavid S. Miller int err = 0; 1171db8dac20SDavid S. Miller int is_udplite = IS_UDPLITE(sk); 1172db8dac20SDavid S. Miller __wsum csum = 0; 1173d39d938cSVlad Yasevich int offset = skb_transport_offset(skb); 1174d39d938cSVlad Yasevich int len = skb->len - offset; 11754094871dSJosh Hunt int datalen = len - sizeof(*uh); 1176db8dac20SDavid S. Miller 1177db8dac20SDavid S. Miller /* 1178db8dac20SDavid S. Miller * Create a UDP header 1179db8dac20SDavid S. Miller */ 1180db8dac20SDavid S. Miller uh = udp_hdr(skb); 11811958b856SDavid S. Miller uh->source = fl6->fl6_sport; 11821958b856SDavid S. Miller uh->dest = fl6->fl6_dport; 1183d39d938cSVlad Yasevich uh->len = htons(len); 1184db8dac20SDavid S. Miller uh->check = 0; 1185db8dac20SDavid S. Miller 1186bec1f6f6SWillem de Bruijn if (cork->gso_size) { 1187bec1f6f6SWillem de Bruijn const int hlen = skb_network_header_len(skb) + 1188bec1f6f6SWillem de Bruijn sizeof(struct udphdr); 1189bec1f6f6SWillem de Bruijn 11900f149c9fSWillem de Bruijn if (hlen + cork->gso_size > cork->fragsize) { 11910f149c9fSWillem de Bruijn kfree_skb(skb); 1192bec1f6f6SWillem de Bruijn return -EINVAL; 11930f149c9fSWillem de Bruijn } 11940f149c9fSWillem de Bruijn if (skb->len > cork->gso_size * UDP_MAX_SEGMENTS) { 11950f149c9fSWillem de Bruijn kfree_skb(skb); 1196bec1f6f6SWillem de Bruijn return -EINVAL; 11970f149c9fSWillem de Bruijn } 11980f149c9fSWillem de Bruijn if (udp_sk(sk)->no_check6_tx) { 11990f149c9fSWillem de Bruijn kfree_skb(skb); 1200a8c744a8SWillem de Bruijn return -EINVAL; 12010f149c9fSWillem de Bruijn } 1202ff06342cSWillem de Bruijn if (skb->ip_summed != CHECKSUM_PARTIAL || is_udplite || 12030f149c9fSWillem de Bruijn dst_xfrm(skb_dst(skb))) { 12040f149c9fSWillem de Bruijn kfree_skb(skb); 1205bec1f6f6SWillem de Bruijn return -EIO; 12060f149c9fSWillem de Bruijn } 1207bec1f6f6SWillem de Bruijn 12084094871dSJosh Hunt if (datalen > cork->gso_size) { 1209bec1f6f6SWillem de Bruijn skb_shinfo(skb)->gso_size = cork->gso_size; 1210bec1f6f6SWillem de Bruijn skb_shinfo(skb)->gso_type = SKB_GSO_UDP_L4; 12114094871dSJosh Hunt skb_shinfo(skb)->gso_segs = DIV_ROUND_UP(datalen, 121244b321e5SJosh Hunt cork->gso_size); 12134094871dSJosh Hunt } 1214a8c744a8SWillem de Bruijn goto csum_partial; 1215bec1f6f6SWillem de Bruijn } 1216bec1f6f6SWillem de Bruijn 1217db8dac20SDavid S. Miller if (is_udplite) 1218d39d938cSVlad Yasevich csum = udplite_csum(skb); 1219d39d938cSVlad Yasevich else if (udp_sk(sk)->no_check6_tx) { /* UDP csum disabled */ 12204068579eSTom Herbert skb->ip_summed = CHECKSUM_NONE; 12214068579eSTom Herbert goto send; 12224068579eSTom Herbert } else if (skb->ip_summed == CHECKSUM_PARTIAL) { /* UDP hardware csum */ 1223a8c744a8SWillem de Bruijn csum_partial: 1224d39d938cSVlad Yasevich udp6_hwcsum_outgoing(sk, skb, &fl6->saddr, &fl6->daddr, len); 1225493c6be3SSridhar Samudrala goto send; 1226493c6be3SSridhar Samudrala } else 1227d39d938cSVlad Yasevich csum = udp_csum(skb); 1228db8dac20SDavid S. Miller 1229db8dac20SDavid S. Miller /* add protocol-dependent pseudo-header */ 12304c9483b2SDavid S. Miller uh->check = csum_ipv6_magic(&fl6->saddr, &fl6->daddr, 1231d39d938cSVlad Yasevich len, fl6->flowi6_proto, csum); 1232db8dac20SDavid S. Miller if (uh->check == 0) 1233db8dac20SDavid S. Miller uh->check = CSUM_MANGLED_0; 1234db8dac20SDavid S. Miller 1235493c6be3SSridhar Samudrala send: 1236d39d938cSVlad Yasevich err = ip6_send_skb(skb); 12376ce9e7b5SEric Dumazet if (err) { 12386ce9e7b5SEric Dumazet if (err == -ENOBUFS && !inet6_sk(sk)->recverr) { 12396aef70a8SEric Dumazet UDP6_INC_STATS(sock_net(sk), 12406ce9e7b5SEric Dumazet UDP_MIB_SNDBUFERRORS, is_udplite); 12416ce9e7b5SEric Dumazet err = 0; 12426ce9e7b5SEric Dumazet } 12436aef70a8SEric Dumazet } else { 12446aef70a8SEric Dumazet UDP6_INC_STATS(sock_net(sk), 12456ce9e7b5SEric Dumazet UDP_MIB_OUTDATAGRAMS, is_udplite); 12466aef70a8SEric Dumazet } 1247d39d938cSVlad Yasevich return err; 1248d39d938cSVlad Yasevich } 1249d39d938cSVlad Yasevich 1250d39d938cSVlad Yasevich static int udp_v6_push_pending_frames(struct sock *sk) 1251d39d938cSVlad Yasevich { 1252d39d938cSVlad Yasevich struct sk_buff *skb; 1253d39d938cSVlad Yasevich struct udp_sock *up = udp_sk(sk); 1254d39d938cSVlad Yasevich struct flowi6 fl6; 1255d39d938cSVlad Yasevich int err = 0; 1256d39d938cSVlad Yasevich 1257d39d938cSVlad Yasevich if (up->pending == AF_INET) 1258d39d938cSVlad Yasevich return udp_push_pending_frames(sk); 1259d39d938cSVlad Yasevich 1260d39d938cSVlad Yasevich /* ip6_finish_skb will release the cork, so make a copy of 1261d39d938cSVlad Yasevich * fl6 here. 1262d39d938cSVlad Yasevich */ 1263d39d938cSVlad Yasevich fl6 = inet_sk(sk)->cork.fl.u.ip6; 1264d39d938cSVlad Yasevich 1265d39d938cSVlad Yasevich skb = ip6_finish_skb(sk); 1266d39d938cSVlad Yasevich if (!skb) 1267d39d938cSVlad Yasevich goto out; 1268d39d938cSVlad Yasevich 1269bec1f6f6SWillem de Bruijn err = udp_v6_send_skb(skb, &fl6, &inet_sk(sk)->cork.base); 1270d39d938cSVlad Yasevich 1271db8dac20SDavid S. Miller out: 1272db8dac20SDavid S. Miller up->len = 0; 1273db8dac20SDavid S. Miller up->pending = 0; 1274db8dac20SDavid S. Miller return err; 1275db8dac20SDavid S. Miller } 1276db8dac20SDavid S. Miller 12771b784140SYing Xue int udpv6_sendmsg(struct sock *sk, struct msghdr *msg, size_t len) 1278db8dac20SDavid S. Miller { 1279db8dac20SDavid S. Miller struct ipv6_txoptions opt_space; 1280db8dac20SDavid S. Miller struct udp_sock *up = udp_sk(sk); 1281db8dac20SDavid S. Miller struct inet_sock *inet = inet_sk(sk); 1282db8dac20SDavid S. Miller struct ipv6_pinfo *np = inet6_sk(sk); 1283342dfc30SSteffen Hurrle DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, msg->msg_name); 128420c59de2SArnaud Ebalard struct in6_addr *daddr, *final_p, final; 1285db8dac20SDavid S. Miller struct ipv6_txoptions *opt = NULL; 128645f6fad8SEric Dumazet struct ipv6_txoptions *opt_to_free = NULL; 1287db8dac20SDavid S. Miller struct ip6_flowlabel *flowlabel = NULL; 12884c9483b2SDavid S. Miller struct flowi6 fl6; 1289db8dac20SDavid S. Miller struct dst_entry *dst; 129026879da5SWei Wang struct ipcm6_cookie ipc6; 1291db8dac20SDavid S. Miller int addr_len = msg->msg_namelen; 12929f542f61SAlexey Kodanev bool connected = false; 1293db8dac20SDavid S. Miller int ulen = len; 1294db8dac20SDavid S. Miller int corkreq = up->corkflag || msg->msg_flags&MSG_MORE; 1295db8dac20SDavid S. Miller int err; 1296db8dac20SDavid S. Miller int is_udplite = IS_UDPLITE(sk); 1297db8dac20SDavid S. Miller int (*getfrag)(void *, char *, int, int, int, struct sk_buff *); 1298db8dac20SDavid S. Miller 1299b515430aSWillem de Bruijn ipcm6_init(&ipc6); 1300bec1f6f6SWillem de Bruijn ipc6.gso_size = up->gso_size; 13015fdaa88dSWillem de Bruijn ipc6.sockc.tsflags = sk->sk_tsflags; 1302c6af0c22SWillem de Bruijn ipc6.sockc.mark = sk->sk_mark; 130326879da5SWei Wang 1304db8dac20SDavid S. Miller /* destination address check */ 1305db8dac20SDavid S. Miller if (sin6) { 1306db8dac20SDavid S. Miller if (addr_len < offsetof(struct sockaddr, sa_data)) 1307db8dac20SDavid S. Miller return -EINVAL; 1308db8dac20SDavid S. Miller 1309db8dac20SDavid S. Miller switch (sin6->sin6_family) { 1310db8dac20SDavid S. Miller case AF_INET6: 1311db8dac20SDavid S. Miller if (addr_len < SIN6_LEN_RFC2133) 1312db8dac20SDavid S. Miller return -EINVAL; 1313db8dac20SDavid S. Miller daddr = &sin6->sin6_addr; 1314052d2369SJonathan T. Leighton if (ipv6_addr_any(daddr) && 1315052d2369SJonathan T. Leighton ipv6_addr_v4mapped(&np->saddr)) 1316052d2369SJonathan T. Leighton ipv6_addr_set_v4mapped(htonl(INADDR_LOOPBACK), 1317052d2369SJonathan T. Leighton daddr); 1318db8dac20SDavid S. Miller break; 1319db8dac20SDavid S. Miller case AF_INET: 1320db8dac20SDavid S. Miller goto do_udp_sendmsg; 1321db8dac20SDavid S. Miller case AF_UNSPEC: 1322db8dac20SDavid S. Miller msg->msg_name = sin6 = NULL; 1323db8dac20SDavid S. Miller msg->msg_namelen = addr_len = 0; 1324db8dac20SDavid S. Miller daddr = NULL; 1325db8dac20SDavid S. Miller break; 1326db8dac20SDavid S. Miller default: 1327db8dac20SDavid S. Miller return -EINVAL; 1328db8dac20SDavid S. Miller } 1329db8dac20SDavid S. Miller } else if (!up->pending) { 1330db8dac20SDavid S. Miller if (sk->sk_state != TCP_ESTABLISHED) 1331db8dac20SDavid S. Miller return -EDESTADDRREQ; 1332efe4208fSEric Dumazet daddr = &sk->sk_v6_daddr; 1333db8dac20SDavid S. Miller } else 1334db8dac20SDavid S. Miller daddr = NULL; 1335db8dac20SDavid S. Miller 1336db8dac20SDavid S. Miller if (daddr) { 1337db8dac20SDavid S. Miller if (ipv6_addr_v4mapped(daddr)) { 1338db8dac20SDavid S. Miller struct sockaddr_in sin; 1339db8dac20SDavid S. Miller sin.sin_family = AF_INET; 1340c720c7e8SEric Dumazet sin.sin_port = sin6 ? sin6->sin6_port : inet->inet_dport; 1341db8dac20SDavid S. Miller sin.sin_addr.s_addr = daddr->s6_addr32[3]; 1342db8dac20SDavid S. Miller msg->msg_name = &sin; 1343db8dac20SDavid S. Miller msg->msg_namelen = sizeof(sin); 1344db8dac20SDavid S. Miller do_udp_sendmsg: 1345db8dac20SDavid S. Miller if (__ipv6_only_sock(sk)) 1346db8dac20SDavid S. Miller return -ENETUNREACH; 13471b784140SYing Xue return udp_sendmsg(sk, msg, len); 1348db8dac20SDavid S. Miller } 1349db8dac20SDavid S. Miller } 1350db8dac20SDavid S. Miller 1351db8dac20SDavid S. Miller if (up->pending == AF_INET) 13521b784140SYing Xue return udp_sendmsg(sk, msg, len); 1353db8dac20SDavid S. Miller 1354db8dac20SDavid S. Miller /* Rough check on arithmetic overflow, 1355db8dac20SDavid S. Miller better check is made in ip6_append_data(). 1356db8dac20SDavid S. Miller */ 1357db8dac20SDavid S. Miller if (len > INT_MAX - sizeof(struct udphdr)) 1358db8dac20SDavid S. Miller return -EMSGSIZE; 1359db8dac20SDavid S. Miller 136003485f2aSVlad Yasevich getfrag = is_udplite ? udplite_getfrag : ip_generic_getfrag; 1361db8dac20SDavid S. Miller if (up->pending) { 1362db8dac20SDavid S. Miller /* 1363db8dac20SDavid S. Miller * There are pending frames. 1364db8dac20SDavid S. Miller * The socket lock must be held while it's corked. 1365db8dac20SDavid S. Miller */ 1366db8dac20SDavid S. Miller lock_sock(sk); 1367db8dac20SDavid S. Miller if (likely(up->pending)) { 1368db8dac20SDavid S. Miller if (unlikely(up->pending != AF_INET6)) { 1369db8dac20SDavid S. Miller release_sock(sk); 1370db8dac20SDavid S. Miller return -EAFNOSUPPORT; 1371db8dac20SDavid S. Miller } 1372db8dac20SDavid S. Miller dst = NULL; 1373db8dac20SDavid S. Miller goto do_append_data; 1374db8dac20SDavid S. Miller } 1375db8dac20SDavid S. Miller release_sock(sk); 1376db8dac20SDavid S. Miller } 1377db8dac20SDavid S. Miller ulen += sizeof(struct udphdr); 1378db8dac20SDavid S. Miller 13794c9483b2SDavid S. Miller memset(&fl6, 0, sizeof(fl6)); 1380db8dac20SDavid S. Miller 1381db8dac20SDavid S. Miller if (sin6) { 1382db8dac20SDavid S. Miller if (sin6->sin6_port == 0) 1383db8dac20SDavid S. Miller return -EINVAL; 1384db8dac20SDavid S. Miller 13851958b856SDavid S. Miller fl6.fl6_dport = sin6->sin6_port; 1386db8dac20SDavid S. Miller daddr = &sin6->sin6_addr; 1387db8dac20SDavid S. Miller 1388db8dac20SDavid S. Miller if (np->sndflow) { 13894c9483b2SDavid S. Miller fl6.flowlabel = sin6->sin6_flowinfo&IPV6_FLOWINFO_MASK; 13904c9483b2SDavid S. Miller if (fl6.flowlabel&IPV6_FLOWLABEL_MASK) { 13914c9483b2SDavid S. Miller flowlabel = fl6_sock_lookup(sk, fl6.flowlabel); 139259c820b2SWillem de Bruijn if (IS_ERR(flowlabel)) 1393db8dac20SDavid S. Miller return -EINVAL; 1394db8dac20SDavid S. Miller } 1395db8dac20SDavid S. Miller } 1396db8dac20SDavid S. Miller 1397db8dac20SDavid S. Miller /* 1398db8dac20SDavid S. Miller * Otherwise it will be difficult to maintain 1399db8dac20SDavid S. Miller * sk->sk_dst_cache. 1400db8dac20SDavid S. Miller */ 1401db8dac20SDavid S. Miller if (sk->sk_state == TCP_ESTABLISHED && 1402efe4208fSEric Dumazet ipv6_addr_equal(daddr, &sk->sk_v6_daddr)) 1403efe4208fSEric Dumazet daddr = &sk->sk_v6_daddr; 1404db8dac20SDavid S. Miller 1405db8dac20SDavid S. Miller if (addr_len >= sizeof(struct sockaddr_in6) && 1406db8dac20SDavid S. Miller sin6->sin6_scope_id && 1407842df073SHannes Frederic Sowa __ipv6_addr_needs_scope_id(__ipv6_addr_type(daddr))) 14084c9483b2SDavid S. Miller fl6.flowi6_oif = sin6->sin6_scope_id; 1409db8dac20SDavid S. Miller } else { 1410db8dac20SDavid S. Miller if (sk->sk_state != TCP_ESTABLISHED) 1411db8dac20SDavid S. Miller return -EDESTADDRREQ; 1412db8dac20SDavid S. Miller 14131958b856SDavid S. Miller fl6.fl6_dport = inet->inet_dport; 1414efe4208fSEric Dumazet daddr = &sk->sk_v6_daddr; 14154c9483b2SDavid S. Miller fl6.flowlabel = np->flow_label; 14169f542f61SAlexey Kodanev connected = true; 1417db8dac20SDavid S. Miller } 1418db8dac20SDavid S. Miller 14194c9483b2SDavid S. Miller if (!fl6.flowi6_oif) 14204c9483b2SDavid S. Miller fl6.flowi6_oif = sk->sk_bound_dev_if; 1421db8dac20SDavid S. Miller 14224c9483b2SDavid S. Miller if (!fl6.flowi6_oif) 14234c9483b2SDavid S. Miller fl6.flowi6_oif = np->sticky_pktinfo.ipi6_ifindex; 14249f690db7SYang Hongyang 1425c6af0c22SWillem de Bruijn fl6.flowi6_mark = ipc6.sockc.mark; 1426e2d118a1SLorenzo Colitti fl6.flowi6_uid = sk->sk_uid; 142751953d5bSBrian Haley 1428db8dac20SDavid S. Miller if (msg->msg_controllen) { 1429db8dac20SDavid S. Miller opt = &opt_space; 1430db8dac20SDavid S. Miller memset(opt, 0, sizeof(struct ipv6_txoptions)); 1431db8dac20SDavid S. Miller opt->tot_len = sizeof(*opt); 143226879da5SWei Wang ipc6.opt = opt; 1433db8dac20SDavid S. Miller 14342e8de857SWillem de Bruijn err = udp_cmsg_send(sk, msg, &ipc6.gso_size); 14352e8de857SWillem de Bruijn if (err > 0) 14362e8de857SWillem de Bruijn err = ip6_datagram_send_ctl(sock_net(sk), sk, msg, &fl6, 14375fdaa88dSWillem de Bruijn &ipc6); 1438db8dac20SDavid S. Miller if (err < 0) { 1439db8dac20SDavid S. Miller fl6_sock_release(flowlabel); 1440db8dac20SDavid S. Miller return err; 1441db8dac20SDavid S. Miller } 14424c9483b2SDavid S. Miller if ((fl6.flowlabel&IPV6_FLOWLABEL_MASK) && !flowlabel) { 14434c9483b2SDavid S. Miller flowlabel = fl6_sock_lookup(sk, fl6.flowlabel); 144459c820b2SWillem de Bruijn if (IS_ERR(flowlabel)) 1445db8dac20SDavid S. Miller return -EINVAL; 1446db8dac20SDavid S. Miller } 1447db8dac20SDavid S. Miller if (!(opt->opt_nflen|opt->opt_flen)) 1448db8dac20SDavid S. Miller opt = NULL; 14499f542f61SAlexey Kodanev connected = false; 1450db8dac20SDavid S. Miller } 145145f6fad8SEric Dumazet if (!opt) { 145245f6fad8SEric Dumazet opt = txopt_get(np); 145345f6fad8SEric Dumazet opt_to_free = opt; 145445f6fad8SEric Dumazet } 1455db8dac20SDavid S. Miller if (flowlabel) 1456db8dac20SDavid S. Miller opt = fl6_merge_options(&opt_space, flowlabel, opt); 1457db8dac20SDavid S. Miller opt = ipv6_fixup_options(&opt_space, opt); 145826879da5SWei Wang ipc6.opt = opt; 1459db8dac20SDavid S. Miller 14604c9483b2SDavid S. Miller fl6.flowi6_proto = sk->sk_protocol; 14614e3fd7a0SAlexey Dobriyan fl6.daddr = *daddr; 14624c9483b2SDavid S. Miller if (ipv6_addr_any(&fl6.saddr) && !ipv6_addr_any(&np->saddr)) 14634e3fd7a0SAlexey Dobriyan fl6.saddr = np->saddr; 14641958b856SDavid S. Miller fl6.fl6_sport = inet->inet_sport; 1465db8dac20SDavid S. Miller 14661cedee13SAndrey Ignatov if (cgroup_bpf_enabled && !connected) { 14671cedee13SAndrey Ignatov err = BPF_CGROUP_RUN_PROG_UDP6_SENDMSG_LOCK(sk, 14681cedee13SAndrey Ignatov (struct sockaddr *)sin6, &fl6.saddr); 14691cedee13SAndrey Ignatov if (err) 14701cedee13SAndrey Ignatov goto out_no_dst; 14711cedee13SAndrey Ignatov if (sin6) { 14721cedee13SAndrey Ignatov if (ipv6_addr_v4mapped(&sin6->sin6_addr)) { 14731cedee13SAndrey Ignatov /* BPF program rewrote IPv6-only by IPv4-mapped 14741cedee13SAndrey Ignatov * IPv6. It's currently unsupported. 14751cedee13SAndrey Ignatov */ 14761cedee13SAndrey Ignatov err = -ENOTSUPP; 14771cedee13SAndrey Ignatov goto out_no_dst; 14781cedee13SAndrey Ignatov } 14791cedee13SAndrey Ignatov if (sin6->sin6_port == 0) { 14801cedee13SAndrey Ignatov /* BPF program set invalid port. Reject it. */ 14811cedee13SAndrey Ignatov err = -EINVAL; 14821cedee13SAndrey Ignatov goto out_no_dst; 14831cedee13SAndrey Ignatov } 14841cedee13SAndrey Ignatov fl6.fl6_dport = sin6->sin6_port; 14851cedee13SAndrey Ignatov fl6.daddr = sin6->sin6_addr; 14861cedee13SAndrey Ignatov } 14871cedee13SAndrey Ignatov } 14881cedee13SAndrey Ignatov 1489e8e36984SAndrey Ignatov if (ipv6_addr_any(&fl6.daddr)) 1490e8e36984SAndrey Ignatov fl6.daddr.s6_addr[15] = 0x1; /* :: means loopback (BSD'ism) */ 1491e8e36984SAndrey Ignatov 14924c9483b2SDavid S. Miller final_p = fl6_update_dst(&fl6, opt, &final); 149320c59de2SArnaud Ebalard if (final_p) 14949f542f61SAlexey Kodanev connected = false; 1495db8dac20SDavid S. Miller 14964c9483b2SDavid S. Miller if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr)) { 14974c9483b2SDavid S. Miller fl6.flowi6_oif = np->mcast_oif; 14989f542f61SAlexey Kodanev connected = false; 1499c4062dfcSErich E. Hoover } else if (!fl6.flowi6_oif) 1500c4062dfcSErich E. Hoover fl6.flowi6_oif = np->ucast_oif; 1501db8dac20SDavid S. Miller 15024c9483b2SDavid S. Miller security_sk_classify_flow(sk, flowi6_to_flowi(&fl6)); 1503db8dac20SDavid S. Miller 150438b7097bSHannes Frederic Sowa if (ipc6.tclass < 0) 150538b7097bSHannes Frederic Sowa ipc6.tclass = np->tclass; 150638b7097bSHannes Frederic Sowa 150738b7097bSHannes Frederic Sowa fl6.flowlabel = ip6_make_flowinfo(ipc6.tclass, fl6.flowlabel); 150838b7097bSHannes Frederic Sowa 15094f858c56SAlexey Kodanev dst = ip6_sk_dst_lookup_flow(sk, &fl6, final_p, connected); 151068d0c6d3SDavid S. Miller if (IS_ERR(dst)) { 151168d0c6d3SDavid S. Miller err = PTR_ERR(dst); 151268d0c6d3SDavid S. Miller dst = NULL; 1513db8dac20SDavid S. Miller goto out; 1514db8dac20SDavid S. Miller } 1515db8dac20SDavid S. Miller 151626879da5SWei Wang if (ipc6.hlimit < 0) 151726879da5SWei Wang ipc6.hlimit = ip6_sk_dst_hoplimit(np, &fl6, dst); 1518db8dac20SDavid S. Miller 1519db8dac20SDavid S. Miller if (msg->msg_flags&MSG_CONFIRM) 1520db8dac20SDavid S. Miller goto do_confirm; 1521db8dac20SDavid S. Miller back_from_confirm: 1522db8dac20SDavid S. Miller 152303485f2aSVlad Yasevich /* Lockless fast path for the non-corking case */ 152403485f2aSVlad Yasevich if (!corkreq) { 15251cd7884dSWillem de Bruijn struct inet_cork_full cork; 152603485f2aSVlad Yasevich struct sk_buff *skb; 152703485f2aSVlad Yasevich 152803485f2aSVlad Yasevich skb = ip6_make_skb(sk, getfrag, msg, ulen, 152926879da5SWei Wang sizeof(struct udphdr), &ipc6, 153003485f2aSVlad Yasevich &fl6, (struct rt6_info *)dst, 15315fdaa88dSWillem de Bruijn msg->msg_flags, &cork); 153203485f2aSVlad Yasevich err = PTR_ERR(skb); 153303485f2aSVlad Yasevich if (!IS_ERR_OR_NULL(skb)) 1534bec1f6f6SWillem de Bruijn err = udp_v6_send_skb(skb, &fl6, &cork.base); 15354f858c56SAlexey Kodanev goto out; 153603485f2aSVlad Yasevich } 153703485f2aSVlad Yasevich 1538db8dac20SDavid S. Miller lock_sock(sk); 1539db8dac20SDavid S. Miller if (unlikely(up->pending)) { 1540db8dac20SDavid S. Miller /* The socket is already corked while preparing it. */ 1541db8dac20SDavid S. Miller /* ... which is an evident application bug. --ANK */ 1542db8dac20SDavid S. Miller release_sock(sk); 1543db8dac20SDavid S. Miller 1544ba7a46f1SJoe Perches net_dbg_ratelimited("udp cork app bug 2\n"); 1545db8dac20SDavid S. Miller err = -EINVAL; 1546db8dac20SDavid S. Miller goto out; 1547db8dac20SDavid S. Miller } 1548db8dac20SDavid S. Miller 1549db8dac20SDavid S. Miller up->pending = AF_INET6; 1550db8dac20SDavid S. Miller 1551db8dac20SDavid S. Miller do_append_data: 155226879da5SWei Wang if (ipc6.dontfrag < 0) 155326879da5SWei Wang ipc6.dontfrag = np->dontfrag; 1554db8dac20SDavid S. Miller up->len += ulen; 155526879da5SWei Wang err = ip6_append_data(sk, getfrag, msg, ulen, sizeof(struct udphdr), 155626879da5SWei Wang &ipc6, &fl6, (struct rt6_info *)dst, 15575fdaa88dSWillem de Bruijn corkreq ? msg->msg_flags|MSG_MORE : msg->msg_flags); 1558db8dac20SDavid S. Miller if (err) 1559db8dac20SDavid S. Miller udp_v6_flush_pending_frames(sk); 1560db8dac20SDavid S. Miller else if (!corkreq) 1561db8dac20SDavid S. Miller err = udp_v6_push_pending_frames(sk); 1562db8dac20SDavid S. Miller else if (unlikely(skb_queue_empty(&sk->sk_write_queue))) 1563db8dac20SDavid S. Miller up->pending = 0; 1564db8dac20SDavid S. Miller 156503485f2aSVlad Yasevich if (err > 0) 156603485f2aSVlad Yasevich err = np->recverr ? net_xmit_errno(err) : 0; 156703485f2aSVlad Yasevich release_sock(sk); 156803485f2aSVlad Yasevich 1569db8dac20SDavid S. Miller out: 1570a3c96089SYOSHIFUJI Hideaki dst_release(dst); 15711cedee13SAndrey Ignatov out_no_dst: 1572db8dac20SDavid S. Miller fl6_sock_release(flowlabel); 157345f6fad8SEric Dumazet txopt_put(opt_to_free); 1574db8dac20SDavid S. Miller if (!err) 1575db8dac20SDavid S. Miller return len; 1576db8dac20SDavid S. Miller /* 1577db8dac20SDavid S. Miller * ENOBUFS = no kernel mem, SOCK_NOSPACE = no sndbuf space. Reporting 1578db8dac20SDavid S. Miller * ENOBUFS might not be good (it's not tunable per se), but otherwise 1579db8dac20SDavid S. Miller * we don't have a good statistic (IpOutDiscards but it can be too many 1580db8dac20SDavid S. Miller * things). We could add another new stat but at least for now that 1581db8dac20SDavid S. Miller * seems like overkill. 1582db8dac20SDavid S. Miller */ 1583db8dac20SDavid S. Miller if (err == -ENOBUFS || test_bit(SOCK_NOSPACE, &sk->sk_socket->flags)) { 15846aef70a8SEric Dumazet UDP6_INC_STATS(sock_net(sk), 1585235b9f7aSPavel Emelyanov UDP_MIB_SNDBUFERRORS, is_udplite); 1586db8dac20SDavid S. Miller } 1587db8dac20SDavid S. Miller return err; 1588db8dac20SDavid S. Miller 1589db8dac20SDavid S. Miller do_confirm: 15900dec879fSJulian Anastasov if (msg->msg_flags & MSG_PROBE) 15910dec879fSJulian Anastasov dst_confirm_neigh(dst, &fl6.daddr); 1592db8dac20SDavid S. Miller if (!(msg->msg_flags&MSG_PROBE) || len) 1593db8dac20SDavid S. Miller goto back_from_confirm; 1594db8dac20SDavid S. Miller err = 0; 1595db8dac20SDavid S. Miller goto out; 1596db8dac20SDavid S. Miller } 1597db8dac20SDavid S. Miller 15987d06b2e0SBrian Haley void udpv6_destroy_sock(struct sock *sk) 1599db8dac20SDavid S. Miller { 160044046a59STom Parkin struct udp_sock *up = udp_sk(sk); 1601db8dac20SDavid S. Miller lock_sock(sk); 1602db8dac20SDavid S. Miller udp_v6_flush_pending_frames(sk); 1603db8dac20SDavid S. Miller release_sock(sk); 1604db8dac20SDavid S. Miller 160560fb9567SPaolo Abeni if (static_branch_unlikely(&udpv6_encap_needed_key)) { 160660fb9567SPaolo Abeni if (up->encap_type) { 160744046a59STom Parkin void (*encap_destroy)(struct sock *sk); 16086aa7de05SMark Rutland encap_destroy = READ_ONCE(up->encap_destroy); 160944046a59STom Parkin if (encap_destroy) 161044046a59STom Parkin encap_destroy(sk); 161144046a59STom Parkin } 161260fb9567SPaolo Abeni if (up->encap_enabled) 16139c480601SPaolo Abeni static_branch_dec(&udpv6_encap_needed_key); 161460fb9567SPaolo Abeni } 161544046a59STom Parkin 1616db8dac20SDavid S. Miller inet6_destroy_sock(sk); 1617db8dac20SDavid S. Miller } 1618db8dac20SDavid S. Miller 1619db8dac20SDavid S. Miller /* 1620db8dac20SDavid S. Miller * Socket option code for UDP 1621db8dac20SDavid S. Miller */ 1622a7b75c5aSChristoph Hellwig int udpv6_setsockopt(struct sock *sk, int level, int optname, sockptr_t optval, 1623a7b75c5aSChristoph Hellwig unsigned int optlen) 1624db8dac20SDavid S. Miller { 1625db8dac20SDavid S. Miller if (level == SOL_UDP || level == SOL_UDPLITE) 162691ac1ccaSChristoph Hellwig return udp_lib_setsockopt(sk, level, optname, 1627a7b75c5aSChristoph Hellwig optval, optlen, 1628db8dac20SDavid S. Miller udp_v6_push_pending_frames); 1629db8dac20SDavid S. Miller return ipv6_setsockopt(sk, level, optname, optval, optlen); 1630db8dac20SDavid S. Miller } 1631db8dac20SDavid S. Miller 1632db8dac20SDavid S. Miller int udpv6_getsockopt(struct sock *sk, int level, int optname, 1633db8dac20SDavid S. Miller char __user *optval, int __user *optlen) 1634db8dac20SDavid S. Miller { 1635db8dac20SDavid S. Miller if (level == SOL_UDP || level == SOL_UDPLITE) 1636db8dac20SDavid S. Miller return udp_lib_getsockopt(sk, level, optname, optval, optlen); 1637db8dac20SDavid S. Miller return ipv6_getsockopt(sk, level, optname, optval, optlen); 1638db8dac20SDavid S. Miller } 1639db8dac20SDavid S. Miller 1640a8e3bb34SDavid Ahern /* thinking of making this const? Don't. 1641a8e3bb34SDavid Ahern * early_demux can change based on sysctl. 1642a8e3bb34SDavid Ahern */ 1643dddb64bcSsubashab@codeaurora.org static struct inet6_protocol udpv6_protocol = { 16445425077dSsubashab@codeaurora.org .early_demux = udp_v6_early_demux, 1645dddb64bcSsubashab@codeaurora.org .early_demux_handler = udp_v6_early_demux, 1646db8dac20SDavid S. Miller .handler = udpv6_rcv, 1647db8dac20SDavid S. Miller .err_handler = udpv6_err, 1648db8dac20SDavid S. Miller .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL, 1649db8dac20SDavid S. Miller }; 1650db8dac20SDavid S. Miller 1651db8dac20SDavid S. Miller /* ------------------------------------------------------------------------ */ 1652db8dac20SDavid S. Miller #ifdef CONFIG_PROC_FS 1653db8dac20SDavid S. Miller int udp6_seq_show(struct seq_file *seq, void *v) 1654db8dac20SDavid S. Miller { 165517ef66afSLorenzo Colitti if (v == SEQ_START_TOKEN) { 165617ef66afSLorenzo Colitti seq_puts(seq, IPV6_SEQ_DGRAM_HEADER); 165717ef66afSLorenzo Colitti } else { 165817ef66afSLorenzo Colitti int bucket = ((struct udp_iter_state *)seq->private)->bucket; 165917ef66afSLorenzo Colitti struct inet_sock *inet = inet_sk(v); 166017ef66afSLorenzo Colitti __u16 srcp = ntohs(inet->inet_sport); 166117ef66afSLorenzo Colitti __u16 destp = ntohs(inet->inet_dport); 16626c206b20SPaolo Abeni __ip6_dgram_sock_seq_show(seq, v, srcp, destp, 16636c206b20SPaolo Abeni udp_rqueue_get(v), bucket); 166417ef66afSLorenzo Colitti } 1665db8dac20SDavid S. Miller return 0; 1666db8dac20SDavid S. Miller } 1667db8dac20SDavid S. Miller 1668c3506372SChristoph Hellwig const struct seq_operations udp6_seq_ops = { 1669a3d2599bSChristoph Hellwig .start = udp_seq_start, 1670a3d2599bSChristoph Hellwig .next = udp_seq_next, 1671a3d2599bSChristoph Hellwig .stop = udp_seq_stop, 1672a3d2599bSChristoph Hellwig .show = udp6_seq_show, 1673a3d2599bSChristoph Hellwig }; 1674c3506372SChristoph Hellwig EXPORT_SYMBOL(udp6_seq_ops); 167573cb88ecSArjan van de Ven 1676db8dac20SDavid S. Miller static struct udp_seq_afinfo udp6_seq_afinfo = { 1677db8dac20SDavid S. Miller .family = AF_INET6, 1678645ca708SEric Dumazet .udp_table = &udp_table, 1679db8dac20SDavid S. Miller }; 1680db8dac20SDavid S. Miller 16812c8c1e72SAlexey Dobriyan int __net_init udp6_proc_init(struct net *net) 1682db8dac20SDavid S. Miller { 1683c3506372SChristoph Hellwig if (!proc_create_net_data("udp6", 0444, net->proc_net, &udp6_seq_ops, 1684c3506372SChristoph Hellwig sizeof(struct udp_iter_state), &udp6_seq_afinfo)) 1685a3d2599bSChristoph Hellwig return -ENOMEM; 1686a3d2599bSChristoph Hellwig return 0; 1687db8dac20SDavid S. Miller } 1688db8dac20SDavid S. Miller 1689ec120da6SIan Morris void udp6_proc_exit(struct net *net) 1690ec120da6SIan Morris { 1691a3d2599bSChristoph Hellwig remove_proc_entry("udp6", net->proc_net); 1692db8dac20SDavid S. Miller } 1693db8dac20SDavid S. Miller #endif /* CONFIG_PROC_FS */ 1694db8dac20SDavid S. Miller 1695db8dac20SDavid S. Miller /* ------------------------------------------------------------------------ */ 1696db8dac20SDavid S. Miller 1697db8dac20SDavid S. Miller struct proto udpv6_prot = { 1698db8dac20SDavid S. Miller .name = "UDPv6", 1699db8dac20SDavid S. Miller .owner = THIS_MODULE, 1700db8dac20SDavid S. Miller .close = udp_lib_close, 1701d74bad4eSAndrey Ignatov .pre_connect = udpv6_pre_connect, 1702db8dac20SDavid S. Miller .connect = ip6_datagram_connect, 1703db8dac20SDavid S. Miller .disconnect = udp_disconnect, 1704db8dac20SDavid S. Miller .ioctl = udp_ioctl, 1705850cbaddSPaolo Abeni .init = udp_init_sock, 1706db8dac20SDavid S. Miller .destroy = udpv6_destroy_sock, 1707db8dac20SDavid S. Miller .setsockopt = udpv6_setsockopt, 1708db8dac20SDavid S. Miller .getsockopt = udpv6_getsockopt, 1709db8dac20SDavid S. Miller .sendmsg = udpv6_sendmsg, 1710db8dac20SDavid S. Miller .recvmsg = udpv6_recvmsg, 1711e646b657SMartin KaFai Lau .release_cb = ip6_datagram_release_cb, 1712db8dac20SDavid S. Miller .hash = udp_lib_hash, 1713db8dac20SDavid S. Miller .unhash = udp_lib_unhash, 1714719f8358SEric Dumazet .rehash = udp_v6_rehash, 1715db8dac20SDavid S. Miller .get_port = udp_v6_get_port, 1716db8dac20SDavid S. Miller .memory_allocated = &udp_memory_allocated, 1717db8dac20SDavid S. Miller .sysctl_mem = sysctl_udp_mem, 17181e802951STonghao Zhang .sysctl_wmem_offset = offsetof(struct net, ipv4.sysctl_udp_wmem_min), 17191e802951STonghao Zhang .sysctl_rmem_offset = offsetof(struct net, ipv4.sysctl_udp_rmem_min), 1720db8dac20SDavid S. Miller .obj_size = sizeof(struct udp6_sock), 1721645ca708SEric Dumazet .h.udp_table = &udp_table, 17225d77dca8SDavid Ahern .diag_destroy = udp_abort, 1723db8dac20SDavid S. Miller }; 1724db8dac20SDavid S. Miller 1725db8dac20SDavid S. Miller static struct inet_protosw udpv6_protosw = { 1726db8dac20SDavid S. Miller .type = SOCK_DGRAM, 1727db8dac20SDavid S. Miller .protocol = IPPROTO_UDP, 1728db8dac20SDavid S. Miller .prot = &udpv6_prot, 1729db8dac20SDavid S. Miller .ops = &inet6_dgram_ops, 1730db8dac20SDavid S. Miller .flags = INET_PROTOSW_PERMANENT, 1731db8dac20SDavid S. Miller }; 1732db8dac20SDavid S. Miller 1733db8dac20SDavid S. Miller int __init udpv6_init(void) 1734db8dac20SDavid S. Miller { 1735db8dac20SDavid S. Miller int ret; 1736db8dac20SDavid S. Miller 17373336288aSVlad Yasevich ret = inet6_add_protocol(&udpv6_protocol, IPPROTO_UDP); 17383336288aSVlad Yasevich if (ret) 1739c6b641a4SVlad Yasevich goto out; 17403336288aSVlad Yasevich 1741db8dac20SDavid S. Miller ret = inet6_register_protosw(&udpv6_protosw); 1742db8dac20SDavid S. Miller if (ret) 1743db8dac20SDavid S. Miller goto out_udpv6_protocol; 1744db8dac20SDavid S. Miller out: 1745db8dac20SDavid S. Miller return ret; 1746db8dac20SDavid S. Miller 1747db8dac20SDavid S. Miller out_udpv6_protocol: 1748db8dac20SDavid S. Miller inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP); 1749db8dac20SDavid S. Miller goto out; 1750db8dac20SDavid S. Miller } 1751db8dac20SDavid S. Miller 1752db8dac20SDavid S. Miller void udpv6_exit(void) 1753db8dac20SDavid S. Miller { 1754db8dac20SDavid S. Miller inet6_unregister_protosw(&udpv6_protosw); 1755db8dac20SDavid S. Miller inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP); 1756db8dac20SDavid S. Miller } 1757