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 20aef2fedaSJakub Kicinski #include <linux/bpf-cgroup.h> 21db8dac20SDavid S. Miller #include <linux/errno.h> 22db8dac20SDavid S. Miller #include <linux/types.h> 23db8dac20SDavid S. Miller #include <linux/socket.h> 24db8dac20SDavid S. Miller #include <linux/sockios.h> 25db8dac20SDavid S. Miller #include <linux/net.h> 26db8dac20SDavid S. Miller #include <linux/in6.h> 27db8dac20SDavid S. Miller #include <linux/netdevice.h> 28db8dac20SDavid S. Miller #include <linux/if_arp.h> 29db8dac20SDavid S. Miller #include <linux/ipv6.h> 30db8dac20SDavid S. Miller #include <linux/icmpv6.h> 31db8dac20SDavid S. Miller #include <linux/init.h> 32db8dac20SDavid S. Miller #include <linux/module.h> 33db8dac20SDavid S. Miller #include <linux/skbuff.h> 345a0e3ad6STejun Heo #include <linux/slab.h> 357c0f6ba6SLinus Torvalds #include <linux/uaccess.h> 360e219ae4SPaolo Abeni #include <linux/indirect_call_wrapper.h> 37db8dac20SDavid S. Miller 38496611d7SCraig Gallek #include <net/addrconf.h> 39db8dac20SDavid S. Miller #include <net/ndisc.h> 40db8dac20SDavid S. Miller #include <net/protocol.h> 41db8dac20SDavid S. Miller #include <net/transp_v6.h> 42db8dac20SDavid S. Miller #include <net/ip6_route.h> 43db8dac20SDavid S. Miller #include <net/raw.h> 44222a011eSAndrew Lunn #include <net/seg6.h> 45db8dac20SDavid S. Miller #include <net/tcp_states.h> 46db8dac20SDavid S. Miller #include <net/ip6_checksum.h> 47e7cc0824SStefano Brivio #include <net/ip6_tunnel.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 59*d38afeecSKuniyuki Iwashima static void udpv6_destruct_sock(struct sock *sk) 60*d38afeecSKuniyuki Iwashima { 61*d38afeecSKuniyuki Iwashima udp_destruct_common(sk); 62*d38afeecSKuniyuki Iwashima inet6_sock_destruct(sk); 63*d38afeecSKuniyuki Iwashima } 64*d38afeecSKuniyuki Iwashima 65*d38afeecSKuniyuki Iwashima int udpv6_init_sock(struct sock *sk) 66*d38afeecSKuniyuki Iwashima { 67*d38afeecSKuniyuki Iwashima skb_queue_head_init(&udp_sk(sk)->reader_queue); 68*d38afeecSKuniyuki Iwashima sk->sk_destruct = udpv6_destruct_sock; 69*d38afeecSKuniyuki Iwashima return 0; 70*d38afeecSKuniyuki Iwashima } 71*d38afeecSKuniyuki Iwashima 726eada011SEric Dumazet static u32 udp6_ehashfn(const struct net *net, 73b50026b5SHannes Frederic Sowa const struct in6_addr *laddr, 74b50026b5SHannes Frederic Sowa const u16 lport, 75b50026b5SHannes Frederic Sowa const struct in6_addr *faddr, 76b50026b5SHannes Frederic Sowa const __be16 fport) 77b50026b5SHannes Frederic Sowa { 781bbdceefSHannes Frederic Sowa static u32 udp6_ehash_secret __read_mostly; 791bbdceefSHannes Frederic Sowa static u32 udp_ipv6_hash_secret __read_mostly; 801bbdceefSHannes Frederic Sowa 811bbdceefSHannes Frederic Sowa u32 lhash, fhash; 821bbdceefSHannes Frederic Sowa 831bbdceefSHannes Frederic Sowa net_get_random_once(&udp6_ehash_secret, 841bbdceefSHannes Frederic Sowa sizeof(udp6_ehash_secret)); 851bbdceefSHannes Frederic Sowa net_get_random_once(&udp_ipv6_hash_secret, 861bbdceefSHannes Frederic Sowa sizeof(udp_ipv6_hash_secret)); 871bbdceefSHannes Frederic Sowa 881bbdceefSHannes Frederic Sowa lhash = (__force u32)laddr->s6_addr32[3]; 891bbdceefSHannes Frederic Sowa fhash = __ipv6_addr_jhash(faddr, udp_ipv6_hash_secret); 901bbdceefSHannes Frederic Sowa 91b50026b5SHannes Frederic Sowa return __inet6_ehashfn(lhash, lport, fhash, fport, 921bbdceefSHannes Frederic Sowa udp_ipv6_hash_secret + net_hash_mix(net)); 93b50026b5SHannes Frederic Sowa } 94b50026b5SHannes Frederic Sowa 956ba5a3c5SPavel Emelyanov int udp_v6_get_port(struct sock *sk, unsigned short snum) 96db8dac20SDavid S. Miller { 9730fff923SEric Dumazet unsigned int hash2_nulladdr = 98f0b1e64cSMartin KaFai Lau ipv6_portaddr_hash(sock_net(sk), &in6addr_any, snum); 9930fff923SEric Dumazet unsigned int hash2_partial = 100f0b1e64cSMartin KaFai Lau ipv6_portaddr_hash(sock_net(sk), &sk->sk_v6_rcv_saddr, 0); 10130fff923SEric Dumazet 102d4cada4aSEric Dumazet /* precompute partial secondary hash */ 10330fff923SEric Dumazet udp_sk(sk)->udp_portaddr_hash = hash2_partial; 104fe38d2a1SJosef Bacik return udp_lib_get_port(sk, snum, hash2_nulladdr); 105db8dac20SDavid S. Miller } 106db8dac20SDavid S. Miller 107f7c46156SAlexey Kodanev void udp_v6_rehash(struct sock *sk) 108719f8358SEric Dumazet { 109f0b1e64cSMartin KaFai Lau u16 new_hash = ipv6_portaddr_hash(sock_net(sk), 110efe4208fSEric Dumazet &sk->sk_v6_rcv_saddr, 111719f8358SEric Dumazet inet_sk(sk)->inet_num); 112719f8358SEric Dumazet 113719f8358SEric Dumazet udp_lib_rehash(sk, new_hash); 114719f8358SEric Dumazet } 115719f8358SEric Dumazet 116d1e37288SSu, Xuemin static int compute_score(struct sock *sk, struct net *net, 11788440ae7SBalazs Scheidler const struct in6_addr *saddr, __be16 sport, 118d1e37288SSu, Xuemin const struct in6_addr *daddr, unsigned short hnum, 11973545373STim Beale int dif, int sdif) 120db8dac20SDavid S. Miller { 1214c971d2fSEric Dumazet int bound_dev_if, score; 12260c04aecSJoe Perches struct inet_sock *inet; 1236da5b0f0SMike Manning bool dev_match; 124db8dac20SDavid S. Miller 12560c04aecSJoe Perches if (!net_eq(sock_net(sk), net) || 12660c04aecSJoe Perches udp_sk(sk)->udp_port_hash != hnum || 12760c04aecSJoe Perches sk->sk_family != PF_INET6) 12860c04aecSJoe Perches return -1; 129645ca708SEric Dumazet 13023b0269eSPeter Oskolkov if (!ipv6_addr_equal(&sk->sk_v6_rcv_saddr, daddr)) 13123b0269eSPeter Oskolkov return -1; 13223b0269eSPeter Oskolkov 133645ca708SEric Dumazet score = 0; 13460c04aecSJoe Perches inet = inet_sk(sk); 13560c04aecSJoe Perches 136c720c7e8SEric Dumazet if (inet->inet_dport) { 137c720c7e8SEric Dumazet if (inet->inet_dport != sport) 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 1484c971d2fSEric Dumazet bound_dev_if = READ_ONCE(sk->sk_bound_dev_if); 1494c971d2fSEric Dumazet dev_match = udp_sk_bound_dev_eq(net, bound_dev_if, dif, sdif); 15069678bcdSPaolo Abeni if (!dev_match) 151645ca708SEric Dumazet return -1; 1524c971d2fSEric Dumazet if (bound_dev_if) 153db8dac20SDavid S. Miller score++; 15460c04aecSJoe Perches 1557170a977SEric Dumazet if (READ_ONCE(sk->sk_incoming_cpu) == raw_smp_processor_id()) 15670da268bSEric Dumazet score++; 15770da268bSEric Dumazet 158645ca708SEric Dumazet return score; 159645ca708SEric Dumazet } 160645ca708SEric Dumazet 161a57066b1SDavid S. Miller static struct sock *lookup_reuseport(struct net *net, struct sock *sk, 1622a08748cSJakub Sitnicki struct sk_buff *skb, 1632a08748cSJakub Sitnicki const struct in6_addr *saddr, 1642a08748cSJakub Sitnicki __be16 sport, 1652a08748cSJakub Sitnicki const struct in6_addr *daddr, 1662a08748cSJakub Sitnicki unsigned int hnum) 1672a08748cSJakub Sitnicki { 1682a08748cSJakub Sitnicki struct sock *reuse_sk = NULL; 1692a08748cSJakub Sitnicki u32 hash; 1702a08748cSJakub Sitnicki 1712a08748cSJakub Sitnicki if (sk->sk_reuseport && sk->sk_state != TCP_ESTABLISHED) { 1722a08748cSJakub Sitnicki hash = udp6_ehashfn(net, daddr, hnum, saddr, sport); 1732a08748cSJakub Sitnicki reuse_sk = reuseport_select_sock(sk, hash, skb, 1742a08748cSJakub Sitnicki sizeof(struct udphdr)); 1752a08748cSJakub Sitnicki } 1762a08748cSJakub Sitnicki return reuse_sk; 1772a08748cSJakub Sitnicki } 1782a08748cSJakub Sitnicki 179d1e37288SSu, Xuemin /* called with rcu_read_lock() */ 180fddc17deSEric Dumazet static struct sock *udp6_lib_lookup2(struct net *net, 181fddc17deSEric Dumazet const struct in6_addr *saddr, __be16 sport, 1821801b570SDavid Ahern const struct in6_addr *daddr, unsigned int hnum, 18373545373STim Beale int dif, int sdif, struct udp_hslot *hslot2, 18473545373STim Beale struct sk_buff *skb) 185fddc17deSEric Dumazet { 186fddc17deSEric Dumazet struct sock *sk, *result; 187e94a62f5SPaolo Abeni int score, badness; 188fddc17deSEric Dumazet 189fddc17deSEric Dumazet result = NULL; 190fddc17deSEric Dumazet badness = -1; 191ca065d0cSEric Dumazet udp_portaddr_for_each_entry_rcu(sk, &hslot2->head) { 192d1e37288SSu, Xuemin score = compute_score(sk, net, saddr, sport, 19373545373STim Beale daddr, hnum, dif, sdif); 194fddc17deSEric Dumazet if (score > badness) { 1952a08748cSJakub Sitnicki result = lookup_reuseport(net, sk, skb, 1962a08748cSJakub Sitnicki saddr, sport, daddr, hnum); 197a57066b1SDavid S. Miller /* Fall back to scoring if group has connections */ 198a57066b1SDavid S. Miller if (result && !reuseport_has_conns(sk, false)) 199ca065d0cSEric Dumazet return result; 2002a08748cSJakub Sitnicki 201a57066b1SDavid S. Miller result = result ? : sk; 202ca065d0cSEric Dumazet badness = score; 203fddc17deSEric Dumazet } 204fddc17deSEric Dumazet } 205fddc17deSEric Dumazet return result; 206fddc17deSEric Dumazet } 207fddc17deSEric Dumazet 2086d4201b1SJakub Sitnicki static inline struct sock *udp6_lookup_run_bpf(struct net *net, 2096d4201b1SJakub Sitnicki struct udp_table *udptable, 2106d4201b1SJakub Sitnicki struct sk_buff *skb, 2116d4201b1SJakub Sitnicki const struct in6_addr *saddr, 2126d4201b1SJakub Sitnicki __be16 sport, 2136d4201b1SJakub Sitnicki const struct in6_addr *daddr, 214f8931565SMark Pashmfouroush u16 hnum, const int dif) 2156d4201b1SJakub Sitnicki { 2166d4201b1SJakub Sitnicki struct sock *sk, *reuse_sk; 2176d4201b1SJakub Sitnicki bool no_reuseport; 2186d4201b1SJakub Sitnicki 2196d4201b1SJakub Sitnicki if (udptable != &udp_table) 2206d4201b1SJakub Sitnicki return NULL; /* only UDP is supported */ 2216d4201b1SJakub Sitnicki 222f8931565SMark Pashmfouroush no_reuseport = bpf_sk_lookup_run_v6(net, IPPROTO_UDP, saddr, sport, 223f8931565SMark Pashmfouroush daddr, hnum, dif, &sk); 2246d4201b1SJakub Sitnicki if (no_reuseport || IS_ERR_OR_NULL(sk)) 2256d4201b1SJakub Sitnicki return sk; 2266d4201b1SJakub Sitnicki 2276d4201b1SJakub Sitnicki reuse_sk = lookup_reuseport(net, sk, skb, saddr, sport, daddr, hnum); 228c64c9c28SJakub Sitnicki if (reuse_sk) 2296d4201b1SJakub Sitnicki sk = reuse_sk; 2306d4201b1SJakub Sitnicki return sk; 2316d4201b1SJakub Sitnicki } 2326d4201b1SJakub Sitnicki 233ca065d0cSEric Dumazet /* rcu_read_lock() must be held */ 234fce82338SPavel Emelyanov struct sock *__udp6_lib_lookup(struct net *net, 23588440ae7SBalazs Scheidler const struct in6_addr *saddr, __be16 sport, 23688440ae7SBalazs Scheidler const struct in6_addr *daddr, __be16 dport, 2371801b570SDavid Ahern int dif, int sdif, struct udp_table *udptable, 238538950a1SCraig Gallek struct sk_buff *skb) 239645ca708SEric Dumazet { 240645ca708SEric Dumazet unsigned short hnum = ntohs(dport); 24123b0269eSPeter Oskolkov unsigned int hash2, slot2; 24223b0269eSPeter Oskolkov struct udp_hslot *hslot2; 2436d4201b1SJakub Sitnicki struct sock *result, *sk; 244645ca708SEric Dumazet 245f0b1e64cSMartin KaFai Lau hash2 = ipv6_portaddr_hash(net, daddr, hnum); 246fddc17deSEric Dumazet slot2 = hash2 & udptable->mask; 247fddc17deSEric Dumazet hslot2 = &udptable->hash2[slot2]; 248fddc17deSEric Dumazet 2496d4201b1SJakub Sitnicki /* Lookup connected or non-wildcard sockets */ 250fddc17deSEric Dumazet result = udp6_lib_lookup2(net, saddr, sport, 25173545373STim Beale daddr, hnum, dif, sdif, 252d1e37288SSu, Xuemin hslot2, skb); 2536d4201b1SJakub Sitnicki if (!IS_ERR_OR_NULL(result) && result->sk_state == TCP_ESTABLISHED) 2546d4201b1SJakub Sitnicki goto done; 2556d4201b1SJakub Sitnicki 2566d4201b1SJakub Sitnicki /* Lookup redirect from BPF */ 2576d4201b1SJakub Sitnicki if (static_branch_unlikely(&bpf_sk_lookup_enabled)) { 2586d4201b1SJakub Sitnicki sk = udp6_lookup_run_bpf(net, udptable, skb, 259f8931565SMark Pashmfouroush saddr, sport, daddr, hnum, dif); 2606d4201b1SJakub Sitnicki if (sk) { 2616d4201b1SJakub Sitnicki result = sk; 2626d4201b1SJakub Sitnicki goto done; 2636d4201b1SJakub Sitnicki } 2646d4201b1SJakub Sitnicki } 2656d4201b1SJakub Sitnicki 2666d4201b1SJakub Sitnicki /* Got non-wildcard socket or error on first lookup */ 2676d4201b1SJakub Sitnicki if (result) 2686d4201b1SJakub Sitnicki goto done; 2696d4201b1SJakub Sitnicki 2706d4201b1SJakub Sitnicki /* Lookup wildcard sockets */ 271f0b1e64cSMartin KaFai Lau hash2 = ipv6_portaddr_hash(net, &in6addr_any, hnum); 272fddc17deSEric Dumazet slot2 = hash2 & udptable->mask; 273fddc17deSEric Dumazet hslot2 = &udptable->hash2[slot2]; 274fddc17deSEric Dumazet 2751223c67cSJorge Boncompte [DTI2] result = udp6_lib_lookup2(net, saddr, sport, 27623b0269eSPeter Oskolkov &in6addr_any, hnum, dif, sdif, 27773545373STim Beale hslot2, skb); 2786d4201b1SJakub Sitnicki done: 27926f8113cSEnrico Weigelt if (IS_ERR(result)) 2808217ca65SMartin KaFai Lau return NULL; 281fddc17deSEric Dumazet return result; 282fddc17deSEric Dumazet } 283fce82338SPavel Emelyanov EXPORT_SYMBOL_GPL(__udp6_lib_lookup); 284db8dac20SDavid S. Miller 285607c4aafSKOVACS Krisztian static struct sock *__udp6_lib_lookup_skb(struct sk_buff *skb, 286607c4aafSKOVACS Krisztian __be16 sport, __be16 dport, 287645ca708SEric Dumazet struct udp_table *udptable) 288607c4aafSKOVACS Krisztian { 289b71d1d42SEric Dumazet const struct ipv6hdr *iph = ipv6_hdr(skb); 290607c4aafSKOVACS Krisztian 291ed7cbbceSAlexander Duyck return __udp6_lib_lookup(dev_net(skb->dev), &iph->saddr, sport, 292607c4aafSKOVACS Krisztian &iph->daddr, dport, inet6_iif(skb), 2931801b570SDavid Ahern inet6_sdif(skb), udptable, skb); 294607c4aafSKOVACS Krisztian } 295607c4aafSKOVACS Krisztian 2967b58e63eSEric Dumazet struct sock *udp6_lib_lookup_skb(const struct sk_buff *skb, 29763058308STom Herbert __be16 sport, __be16 dport) 29863058308STom Herbert { 29963058308STom Herbert const struct ipv6hdr *iph = ipv6_hdr(skb); 30063058308STom Herbert 301ed7cbbceSAlexander Duyck return __udp6_lib_lookup(dev_net(skb->dev), &iph->saddr, sport, 30263058308STom Herbert &iph->daddr, dport, inet6_iif(skb), 303257a525fSMartin KaFai Lau inet6_sdif(skb), &udp_table, NULL); 30463058308STom Herbert } 30563058308STom Herbert 306ca065d0cSEric Dumazet /* Must be called under rcu_read_lock(). 307ca065d0cSEric Dumazet * Does increment socket refcount. 308ca065d0cSEric Dumazet */ 3096e86000cSArnd Bergmann #if IS_ENABLED(CONFIG_NF_TPROXY_IPV6) || IS_ENABLED(CONFIG_NF_SOCKET_IPV6) 310aa976fc0SBalazs Scheidler struct sock *udp6_lib_lookup(struct net *net, const struct in6_addr *saddr, __be16 sport, 311aa976fc0SBalazs Scheidler const struct in6_addr *daddr, __be16 dport, int dif) 312aa976fc0SBalazs Scheidler { 313ca065d0cSEric Dumazet struct sock *sk; 314ca065d0cSEric Dumazet 315ca065d0cSEric Dumazet sk = __udp6_lib_lookup(net, saddr, sport, daddr, dport, 3161801b570SDavid Ahern dif, 0, &udp_table, NULL); 31741c6d650SReshetova, Elena if (sk && !refcount_inc_not_zero(&sk->sk_refcnt)) 318ca065d0cSEric Dumazet sk = NULL; 319ca065d0cSEric Dumazet return sk; 320aa976fc0SBalazs Scheidler } 321aa976fc0SBalazs Scheidler EXPORT_SYMBOL_GPL(udp6_lib_lookup); 322ca065d0cSEric Dumazet #endif 323aa976fc0SBalazs Scheidler 324cb891fa6SPaolo Abeni /* do not use the scratch area len for jumbogram: their length execeeds the 325cb891fa6SPaolo Abeni * scratch area space; note that the IP6CB flags is still in the first 326cb891fa6SPaolo Abeni * cacheline, so checking for jumbograms is cheap 327cb891fa6SPaolo Abeni */ 328cb891fa6SPaolo Abeni static int udp6_skb_len(struct sk_buff *skb) 329cb891fa6SPaolo Abeni { 330cb891fa6SPaolo Abeni return unlikely(inet6_is_jumbogram(skb)) ? skb->len : udp_skb_len(skb); 331cb891fa6SPaolo Abeni } 332cb891fa6SPaolo Abeni 333db8dac20SDavid S. Miller /* 334db8dac20SDavid S. Miller * This should be easy, if there is something there we 335db8dac20SDavid S. Miller * return it, otherwise we block. 336db8dac20SDavid S. Miller */ 337db8dac20SDavid S. Miller 3381b784140SYing Xue int udpv6_recvmsg(struct sock *sk, struct msghdr *msg, size_t len, 339ec095263SOliver Hartkopp int flags, int *addr_len) 340db8dac20SDavid S. Miller { 341db8dac20SDavid S. Miller struct ipv6_pinfo *np = inet6_sk(sk); 342db8dac20SDavid S. Miller struct inet_sock *inet = inet_sk(sk); 343db8dac20SDavid S. Miller struct sk_buff *skb; 34459c2cdaeSDavid S. Miller unsigned int ulen, copied; 345fd69c399SPaolo Abeni int off, err, peeking = flags & MSG_PEEK; 346db8dac20SDavid S. Miller int is_udplite = IS_UDPLITE(sk); 347543fc3fbSPaolo Abeni struct udp_mib __percpu *mib; 348197c949eSEric Dumazet bool checksum_valid = false; 349f26ba175SWei Yongjun int is_udp4; 350db8dac20SDavid S. Miller 351db8dac20SDavid S. Miller if (flags & MSG_ERRQUEUE) 35285fbaa75SHannes Frederic Sowa return ipv6_recv_error(sk, msg, len, addr_len); 353db8dac20SDavid S. Miller 3544b340ae2SBrian Haley if (np->rxpmtu && np->rxopt.bits.rxpmtu) 35585fbaa75SHannes Frederic Sowa return ipv6_recv_rxpmtu(sk, msg, len, addr_len); 3564b340ae2SBrian Haley 357db8dac20SDavid S. Miller try_again: 358a0917e0bSMatthew Dawson off = sk_peek_offset(sk, flags); 359ec095263SOliver Hartkopp skb = __skb_recv_udp(sk, flags, &off, &err); 360db8dac20SDavid S. Miller if (!skb) 361627d2d6bSsamanthakumar return err; 362db8dac20SDavid S. Miller 363cb891fa6SPaolo Abeni ulen = udp6_skb_len(skb); 36459c2cdaeSDavid S. Miller copied = len; 365627d2d6bSsamanthakumar if (copied > ulen - off) 366627d2d6bSsamanthakumar copied = ulen - off; 36759c2cdaeSDavid S. Miller else if (copied < ulen) 368db8dac20SDavid S. Miller msg->msg_flags |= MSG_TRUNC; 369db8dac20SDavid S. Miller 370f26ba175SWei Yongjun is_udp4 = (skb->protocol == htons(ETH_P_IP)); 371029a3743SPaolo Abeni mib = __UDPX_MIB(sk, is_udp4); 372f26ba175SWei Yongjun 373db8dac20SDavid S. Miller /* 374db8dac20SDavid S. Miller * If checksum is needed at all, try to do it while copying the 375db8dac20SDavid S. Miller * data. If the data is truncated, or if we only want a partial 376db8dac20SDavid S. Miller * coverage checksum (UDP-Lite), do it before the copy. 377db8dac20SDavid S. Miller */ 378db8dac20SDavid S. Miller 379d21dbdfeSEric Dumazet if (copied < ulen || peeking || 380d21dbdfeSEric Dumazet (is_udplite && UDP_SKB_CB(skb)->partial_cov)) { 38167a51780SPaolo Abeni checksum_valid = udp_skb_csum_unnecessary(skb) || 38267a51780SPaolo Abeni !__udp_lib_checksum_complete(skb); 383197c949eSEric Dumazet if (!checksum_valid) 384db8dac20SDavid S. Miller goto csum_copy_err; 385db8dac20SDavid S. Miller } 386db8dac20SDavid S. Miller 38767a51780SPaolo Abeni if (checksum_valid || udp_skb_csum_unnecessary(skb)) { 38867a51780SPaolo Abeni if (udp_skb_is_linear(skb)) 38967a51780SPaolo Abeni err = copy_linear_skb(skb, copied, off, &msg->msg_iter); 39067a51780SPaolo Abeni else 391627d2d6bSsamanthakumar err = skb_copy_datagram_msg(skb, off, msg, copied); 39267a51780SPaolo Abeni } else { 393627d2d6bSsamanthakumar err = skb_copy_and_csum_datagram_msg(skb, off, msg); 394db8dac20SDavid S. Miller if (err == -EINVAL) 395db8dac20SDavid S. Miller goto csum_copy_err; 396db8dac20SDavid S. Miller } 39722911fc5SEric Dumazet if (unlikely(err)) { 398fd69c399SPaolo Abeni if (!peeking) { 399979402b1SEric Dumazet atomic_inc(&sk->sk_drops); 400029a3743SPaolo Abeni SNMP_INC_STATS(mib, UDP_MIB_INERRORS); 401979402b1SEric Dumazet } 402850cbaddSPaolo Abeni kfree_skb(skb); 403627d2d6bSsamanthakumar return err; 40422911fc5SEric Dumazet } 405fd69c399SPaolo Abeni if (!peeking) 406029a3743SPaolo Abeni SNMP_INC_STATS(mib, UDP_MIB_INDATAGRAMS); 407db8dac20SDavid S. Miller 4086fd1d51cSErin MacNeil sock_recv_cmsgs(msg, sk, skb); 409db8dac20SDavid S. Miller 410db8dac20SDavid S. Miller /* Copy the address. */ 411db8dac20SDavid S. Miller if (msg->msg_name) { 412342dfc30SSteffen Hurrle DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, msg->msg_name); 413db8dac20SDavid S. Miller sin6->sin6_family = AF_INET6; 414db8dac20SDavid S. Miller sin6->sin6_port = udp_hdr(skb)->source; 415db8dac20SDavid S. Miller sin6->sin6_flowinfo = 0; 416db8dac20SDavid S. Miller 417842df073SHannes Frederic Sowa if (is_udp4) { 418b301e82cSBrian Haley ipv6_addr_set_v4mapped(ip_hdr(skb)->saddr, 419b301e82cSBrian Haley &sin6->sin6_addr); 420842df073SHannes Frederic Sowa sin6->sin6_scope_id = 0; 421842df073SHannes Frederic Sowa } else { 4224e3fd7a0SAlexey Dobriyan sin6->sin6_addr = ipv6_hdr(skb)->saddr; 423842df073SHannes Frederic Sowa sin6->sin6_scope_id = 424842df073SHannes Frederic Sowa ipv6_iface_scope_id(&sin6->sin6_addr, 4254330487aSDuan Jiong inet6_iif(skb)); 426db8dac20SDavid S. Miller } 427bceaa902SHannes Frederic Sowa *addr_len = sizeof(*sin6); 428983695faSDaniel Borkmann 429983695faSDaniel Borkmann BPF_CGROUP_RUN_PROG_UDP6_RECVMSG_LOCK(sk, 430983695faSDaniel Borkmann (struct sockaddr *)sin6); 431db8dac20SDavid S. Miller } 4324b261c75SHannes Frederic Sowa 433bcd1665eSPaolo Abeni if (udp_sk(sk)->gro_enabled) 434bcd1665eSPaolo Abeni udp_cmsg_recv(msg, sk, skb); 435bcd1665eSPaolo Abeni 4364b261c75SHannes Frederic Sowa if (np->rxopt.all) 4374b261c75SHannes Frederic Sowa ip6_datagram_recv_common_ctl(sk, msg, skb); 4384b261c75SHannes Frederic Sowa 439f26ba175SWei Yongjun if (is_udp4) { 440db8dac20SDavid S. Miller if (inet->cmsg_flags) 441ad959036SPaolo Abeni ip_cmsg_recv_offset(msg, sk, skb, 44210df8e61SEric Dumazet sizeof(struct udphdr), off); 443db8dac20SDavid S. Miller } else { 444db8dac20SDavid S. Miller if (np->rxopt.all) 4454b261c75SHannes Frederic Sowa ip6_datagram_recv_specific_ctl(sk, msg, skb); 446db8dac20SDavid S. Miller } 447db8dac20SDavid S. Miller 44859c2cdaeSDavid S. Miller err = copied; 449db8dac20SDavid S. Miller if (flags & MSG_TRUNC) 450db8dac20SDavid S. Miller err = ulen; 451db8dac20SDavid S. Miller 452850cbaddSPaolo Abeni skb_consume_udp(sk, skb, peeking ? -err : err); 453db8dac20SDavid S. Miller return err; 454db8dac20SDavid S. Miller 455db8dac20SDavid S. Miller csum_copy_err: 4562276f58aSPaolo Abeni if (!__sk_queue_drop_skb(sk, &udp_sk(sk)->reader_queue, skb, flags, 4572276f58aSPaolo Abeni udp_skb_destructor)) { 458029a3743SPaolo Abeni SNMP_INC_STATS(mib, UDP_MIB_CSUMERRORS); 459029a3743SPaolo Abeni SNMP_INC_STATS(mib, UDP_MIB_INERRORS); 4606a5dc9e5SEric Dumazet } 461850cbaddSPaolo Abeni kfree_skb(skb); 462db8dac20SDavid S. Miller 463beb39db5SEric Dumazet /* starting over for a new packet, but check if we need to yield */ 464beb39db5SEric Dumazet cond_resched(); 4659cfaa8deSXufeng Zhang msg->msg_flags &= ~MSG_TRUNC; 466db8dac20SDavid S. Miller goto try_again; 467db8dac20SDavid S. Miller } 468db8dac20SDavid S. Miller 469a36e185eSStefano Brivio DEFINE_STATIC_KEY_FALSE(udpv6_encap_needed_key); 470a36e185eSStefano Brivio void udpv6_encap_enable(void) 471a36e185eSStefano Brivio { 4729c480601SPaolo Abeni static_branch_inc(&udpv6_encap_needed_key); 473a36e185eSStefano Brivio } 474a36e185eSStefano Brivio EXPORT_SYMBOL(udpv6_encap_enable); 475a36e185eSStefano Brivio 476e7cc0824SStefano Brivio /* Handler for tunnels with arbitrary destination ports: no socket lookup, go 477e7cc0824SStefano Brivio * through error handlers in encapsulations looking for a match. 478e7cc0824SStefano Brivio */ 479e7cc0824SStefano Brivio static int __udp6_lib_err_encap_no_sk(struct sk_buff *skb, 480e7cc0824SStefano Brivio struct inet6_skb_parm *opt, 481424a7cd0SPaolo Abeni u8 type, u8 code, int offset, __be32 info) 482e7cc0824SStefano Brivio { 483e7cc0824SStefano Brivio int i; 484e7cc0824SStefano Brivio 485e7cc0824SStefano Brivio for (i = 0; i < MAX_IPTUN_ENCAP_OPS; i++) { 486e7cc0824SStefano Brivio int (*handler)(struct sk_buff *skb, struct inet6_skb_parm *opt, 487424a7cd0SPaolo Abeni u8 type, u8 code, int offset, __be32 info); 488424a7cd0SPaolo Abeni const struct ip6_tnl_encap_ops *encap; 489e7cc0824SStefano Brivio 490424a7cd0SPaolo Abeni encap = rcu_dereference(ip6tun_encaps[i]); 491424a7cd0SPaolo Abeni if (!encap) 492e7cc0824SStefano Brivio continue; 493424a7cd0SPaolo Abeni handler = encap->err_handler; 494e7cc0824SStefano Brivio if (handler && !handler(skb, opt, type, code, offset, info)) 495e7cc0824SStefano Brivio return 0; 496e7cc0824SStefano Brivio } 497e7cc0824SStefano Brivio 498e7cc0824SStefano Brivio return -ENOENT; 499e7cc0824SStefano Brivio } 500e7cc0824SStefano Brivio 501a36e185eSStefano Brivio /* Try to match ICMP errors to UDP tunnels by looking up a socket without 502a36e185eSStefano Brivio * reversing source and destination port: this will match tunnels that force the 503a36e185eSStefano Brivio * same destination port on both endpoints (e.g. VXLAN, GENEVE). Note that 504a36e185eSStefano Brivio * lwtunnels might actually break this assumption by being configured with 505a36e185eSStefano Brivio * different destination ports on endpoints, in this case we won't be able to 506a36e185eSStefano Brivio * trace ICMP messages back to them. 507a36e185eSStefano Brivio * 508e7cc0824SStefano Brivio * If this doesn't match any socket, probe tunnels with arbitrary destination 509e7cc0824SStefano Brivio * ports (e.g. FoU, GUE): there, the receiving socket is useless, as the port 510e7cc0824SStefano Brivio * we've sent packets to won't necessarily match the local destination port. 511e7cc0824SStefano Brivio * 512a36e185eSStefano Brivio * Then ask the tunnel implementation to match the error against a valid 513a36e185eSStefano Brivio * association. 514a36e185eSStefano Brivio * 515e7cc0824SStefano Brivio * Return an error if we can't find a match, the socket if we need further 516e7cc0824SStefano Brivio * processing, zero otherwise. 517a36e185eSStefano Brivio */ 518a36e185eSStefano Brivio static struct sock *__udp6_lib_err_encap(struct net *net, 519a36e185eSStefano Brivio const struct ipv6hdr *hdr, int offset, 520a36e185eSStefano Brivio struct udphdr *uh, 521a36e185eSStefano Brivio struct udp_table *udptable, 5229bfce73cSVadim Fedorenko struct sock *sk, 523e7cc0824SStefano Brivio struct sk_buff *skb, 524e7cc0824SStefano Brivio struct inet6_skb_parm *opt, 525e7cc0824SStefano Brivio u8 type, u8 code, __be32 info) 526a36e185eSStefano Brivio { 5279bfce73cSVadim Fedorenko int (*lookup)(struct sock *sk, struct sk_buff *skb); 528a36e185eSStefano Brivio int network_offset, transport_offset; 5299bfce73cSVadim Fedorenko struct udp_sock *up; 530a36e185eSStefano Brivio 531a36e185eSStefano Brivio network_offset = skb_network_offset(skb); 532a36e185eSStefano Brivio transport_offset = skb_transport_offset(skb); 533a36e185eSStefano Brivio 534a36e185eSStefano Brivio /* Network header needs to point to the outer IPv6 header inside ICMP */ 535a36e185eSStefano Brivio skb_reset_network_header(skb); 536a36e185eSStefano Brivio 537a36e185eSStefano Brivio /* Transport header needs to point to the UDP header */ 538a36e185eSStefano Brivio skb_set_transport_header(skb, offset); 539a36e185eSStefano Brivio 5409bfce73cSVadim Fedorenko if (sk) { 5419bfce73cSVadim Fedorenko up = udp_sk(sk); 5429bfce73cSVadim Fedorenko 5439bfce73cSVadim Fedorenko lookup = READ_ONCE(up->encap_err_lookup); 5449bfce73cSVadim Fedorenko if (lookup && lookup(sk, skb)) 5459bfce73cSVadim Fedorenko sk = NULL; 5469bfce73cSVadim Fedorenko 5479bfce73cSVadim Fedorenko goto out; 5489bfce73cSVadim Fedorenko } 5499bfce73cSVadim Fedorenko 550e7cc0824SStefano Brivio sk = __udp6_lib_lookup(net, &hdr->daddr, uh->source, 551e7cc0824SStefano Brivio &hdr->saddr, uh->dest, 552e7cc0824SStefano Brivio inet6_iif(skb), 0, udptable, skb); 553e7cc0824SStefano Brivio if (sk) { 5549bfce73cSVadim Fedorenko up = udp_sk(sk); 555e7cc0824SStefano Brivio 556a36e185eSStefano Brivio lookup = READ_ONCE(up->encap_err_lookup); 557a36e185eSStefano Brivio if (!lookup || lookup(sk, skb)) 558a36e185eSStefano Brivio sk = NULL; 559e7cc0824SStefano Brivio } 560e7cc0824SStefano Brivio 5619bfce73cSVadim Fedorenko out: 562e7cc0824SStefano Brivio if (!sk) { 563e7cc0824SStefano Brivio sk = ERR_PTR(__udp6_lib_err_encap_no_sk(skb, opt, type, code, 564e7cc0824SStefano Brivio offset, info)); 565e7cc0824SStefano Brivio } 566a36e185eSStefano Brivio 567a36e185eSStefano Brivio skb_set_transport_header(skb, transport_offset); 568a36e185eSStefano Brivio skb_set_network_header(skb, network_offset); 569e7cc0824SStefano Brivio 570a36e185eSStefano Brivio return sk; 571a36e185eSStefano Brivio } 572a36e185eSStefano Brivio 57332bbd879SStefano Brivio int __udp6_lib_err(struct sk_buff *skb, struct inet6_skb_parm *opt, 574d5fdd6baSBrian Haley u8 type, u8 code, int offset, __be32 info, 575645ca708SEric Dumazet struct udp_table *udptable) 576db8dac20SDavid S. Miller { 577db8dac20SDavid S. Miller struct ipv6_pinfo *np; 578b71d1d42SEric Dumazet const struct ipv6hdr *hdr = (const struct ipv6hdr *)skb->data; 579b71d1d42SEric Dumazet const struct in6_addr *saddr = &hdr->saddr; 580222a011eSAndrew Lunn const struct in6_addr *daddr = seg6_get_daddr(skb, opt) ? : &hdr->daddr; 581db8dac20SDavid S. Miller struct udphdr *uh = (struct udphdr *)(skb->data+offset); 582a36e185eSStefano Brivio bool tunnel = false; 583db8dac20SDavid S. Miller struct sock *sk; 584e0d8c1b7SWei Wang int harderr; 585db8dac20SDavid S. Miller int err; 5867304fe46SDuan Jiong struct net *net = dev_net(skb->dev); 587db8dac20SDavid S. Miller 588e32ea7e7SCraig Gallek sk = __udp6_lib_lookup(net, daddr, uh->dest, saddr, uh->source, 5894ac30c4bSMartin KaFai Lau inet6_iif(skb), inet6_sdif(skb), udptable, NULL); 5909bfce73cSVadim Fedorenko 591d26796aeSXin Long if (!sk || udp_sk(sk)->encap_type) { 592a36e185eSStefano Brivio /* No socket for error: try tunnels before discarding */ 593a36e185eSStefano Brivio if (static_branch_unlikely(&udpv6_encap_needed_key)) { 594a36e185eSStefano Brivio sk = __udp6_lib_err_encap(net, hdr, offset, uh, 5959bfce73cSVadim Fedorenko udptable, sk, skb, 596e7cc0824SStefano Brivio opt, type, code, info); 597e7cc0824SStefano Brivio if (!sk) 598e7cc0824SStefano Brivio return 0; 5999bfce73cSVadim Fedorenko } else 6009bfce73cSVadim Fedorenko sk = ERR_PTR(-ENOENT); 601a36e185eSStefano Brivio 602e7cc0824SStefano Brivio if (IS_ERR(sk)) { 603a16292a0SEric Dumazet __ICMP6_INC_STATS(net, __in6_dev_get(skb->dev), 6047304fe46SDuan Jiong ICMP6_MIB_INERRORS); 605e7cc0824SStefano Brivio return PTR_ERR(sk); 6067304fe46SDuan Jiong } 607e7cc0824SStefano Brivio 608a36e185eSStefano Brivio tunnel = true; 609a36e185eSStefano Brivio } 610db8dac20SDavid S. Miller 611e0d8c1b7SWei Wang harderr = icmpv6_err_convert(type, code, &err); 612e0d8c1b7SWei Wang np = inet6_sk(sk); 613e0d8c1b7SWei Wang 61493b36cf3SHannes Frederic Sowa if (type == ICMPV6_PKT_TOOBIG) { 61593b36cf3SHannes Frederic Sowa if (!ip6_sk_accept_pmtu(sk)) 61693b36cf3SHannes Frederic Sowa goto out; 61781aded24SDavid S. Miller ip6_sk_update_pmtu(skb, sk, info); 618e0d8c1b7SWei Wang if (np->pmtudisc != IPV6_PMTUDISC_DONT) 619e0d8c1b7SWei Wang harderr = 1; 62093b36cf3SHannes Frederic Sowa } 6211a462d18SDuan Jiong if (type == NDISC_REDIRECT) { 622a36e185eSStefano Brivio if (tunnel) { 623a36e185eSStefano Brivio ip6_redirect(skb, sock_net(sk), inet6_iif(skb), 624a36e185eSStefano Brivio sk->sk_mark, sk->sk_uid); 625a36e185eSStefano Brivio } else { 626ec18d9a2SDavid S. Miller ip6_sk_redirect(skb, sk); 627a36e185eSStefano Brivio } 6281a462d18SDuan Jiong goto out; 6291a462d18SDuan Jiong } 63081aded24SDavid S. Miller 631a36e185eSStefano Brivio /* Tunnels don't have an application socket: don't pass errors back */ 632ac56a0b4SDavid Howells if (tunnel) { 633ac56a0b4SDavid Howells if (udp_sk(sk)->encap_err_rcv) 634ac56a0b4SDavid Howells udp_sk(sk)->encap_err_rcv(sk, skb, offset); 635a36e185eSStefano Brivio goto out; 636ac56a0b4SDavid Howells } 637a36e185eSStefano Brivio 638e0d8c1b7SWei Wang if (!np->recverr) { 639e0d8c1b7SWei Wang if (!harderr || sk->sk_state != TCP_ESTABLISHED) 640db8dac20SDavid S. Miller goto out; 641e0d8c1b7SWei Wang } else { 642db8dac20SDavid S. Miller ipv6_icmp_error(sk, skb, err, uh->dest, ntohl(info), (u8 *)(uh+1)); 643e0d8c1b7SWei Wang } 644b1faf566SEric Dumazet 645db8dac20SDavid S. Miller sk->sk_err = err; 646e3ae2365SAlexander Aring sk_error_report(sk); 647db8dac20SDavid S. Miller out: 64832bbd879SStefano Brivio return 0; 649db8dac20SDavid S. Miller } 650db8dac20SDavid S. Miller 651a3f96c47SPaolo Abeni static int __udpv6_queue_rcv_skb(struct sock *sk, struct sk_buff *skb) 652f7ad74feSBenjamin LaHaise { 653f7ad74feSBenjamin LaHaise int rc; 654f7ad74feSBenjamin LaHaise 655efe4208fSEric Dumazet if (!ipv6_addr_any(&sk->sk_v6_daddr)) { 656f7ad74feSBenjamin LaHaise sock_rps_save_rxhash(sk, skb); 657005ec974SShawn Bohrer sk_mark_napi_id(sk, skb); 6582c8c56e1SEric Dumazet sk_incoming_cpu_update(sk); 659e68b6e50SEric Dumazet } else { 660e68b6e50SEric Dumazet sk_mark_napi_id_once(sk, skb); 661005ec974SShawn Bohrer } 662f7ad74feSBenjamin LaHaise 663850cbaddSPaolo Abeni rc = __udp_enqueue_schedule_skb(sk, skb); 664f7ad74feSBenjamin LaHaise if (rc < 0) { 665f7ad74feSBenjamin LaHaise int is_udplite = IS_UDPLITE(sk); 6660d92efdeSDonald Hunter enum skb_drop_reason drop_reason; 667f7ad74feSBenjamin LaHaise 668f7ad74feSBenjamin LaHaise /* Note that an ENOMEM error is charged twice */ 6690d92efdeSDonald Hunter if (rc == -ENOMEM) { 670e61da9e2SEric Dumazet UDP6_INC_STATS(sock_net(sk), 671f7ad74feSBenjamin LaHaise UDP_MIB_RCVBUFERRORS, is_udplite); 6720d92efdeSDonald Hunter drop_reason = SKB_DROP_REASON_SOCKET_RCVBUFF; 6730d92efdeSDonald Hunter } else { 674a3ce2b10SMenglong Dong UDP6_INC_STATS(sock_net(sk), 675a3ce2b10SMenglong Dong UDP_MIB_MEMERRORS, is_udplite); 6760d92efdeSDonald Hunter drop_reason = SKB_DROP_REASON_PROTO_MEM; 6770d92efdeSDonald Hunter } 678e61da9e2SEric Dumazet UDP6_INC_STATS(sock_net(sk), UDP_MIB_INERRORS, is_udplite); 6790d92efdeSDonald Hunter kfree_skb_reason(skb, drop_reason); 680f7ad74feSBenjamin LaHaise return -1; 681f7ad74feSBenjamin LaHaise } 682850cbaddSPaolo Abeni 683f7ad74feSBenjamin LaHaise return 0; 684f7ad74feSBenjamin LaHaise } 685f7ad74feSBenjamin LaHaise 68632bbd879SStefano Brivio static __inline__ int udpv6_err(struct sk_buff *skb, 687d5fdd6baSBrian Haley struct inet6_skb_parm *opt, u8 type, 688d5fdd6baSBrian Haley u8 code, int offset, __be32 info) 689db8dac20SDavid S. Miller { 69032bbd879SStefano Brivio return __udp6_lib_err(skb, opt, type, code, offset, info, &udp_table); 691db8dac20SDavid S. Miller } 692db8dac20SDavid S. Miller 693cf329aa4SPaolo Abeni static int udpv6_queue_rcv_one_skb(struct sock *sk, struct sk_buff *skb) 694db8dac20SDavid S. Miller { 6950d92efdeSDonald Hunter enum skb_drop_reason drop_reason = SKB_DROP_REASON_NOT_SPECIFIED; 696db8dac20SDavid S. Miller struct udp_sock *up = udp_sk(sk); 697db8dac20SDavid S. Miller int is_udplite = IS_UDPLITE(sk); 698db8dac20SDavid S. Miller 6990d92efdeSDonald Hunter if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb)) { 7000d92efdeSDonald Hunter drop_reason = SKB_DROP_REASON_XFRM_POLICY; 701db8dac20SDavid S. Miller goto drop; 7020d92efdeSDonald Hunter } 703db8dac20SDavid S. Miller 70488ab3108SDavidlohr Bueso if (static_branch_unlikely(&udpv6_encap_needed_key) && up->encap_type) { 705d7f3f621SBenjamin LaHaise int (*encap_rcv)(struct sock *sk, struct sk_buff *skb); 706d7f3f621SBenjamin LaHaise 707d7f3f621SBenjamin LaHaise /* 708d7f3f621SBenjamin LaHaise * This is an encapsulation socket so pass the skb to 709d7f3f621SBenjamin LaHaise * the socket's udp_encap_rcv() hook. Otherwise, just 710d7f3f621SBenjamin LaHaise * fall through and pass this up the UDP socket. 711d7f3f621SBenjamin LaHaise * up->encap_rcv() returns the following value: 712d7f3f621SBenjamin LaHaise * =0 if skb was successfully passed to the encap 713d7f3f621SBenjamin LaHaise * handler or was discarded by it. 714d7f3f621SBenjamin LaHaise * >0 if skb should be passed on to UDP. 715d7f3f621SBenjamin LaHaise * <0 if skb should be resubmitted as proto -N 716d7f3f621SBenjamin LaHaise */ 717d7f3f621SBenjamin LaHaise 718d7f3f621SBenjamin LaHaise /* if we're overly short, let UDP handle it */ 7196aa7de05SMark Rutland encap_rcv = READ_ONCE(up->encap_rcv); 720e5aed006SHannes Frederic Sowa if (encap_rcv) { 721d7f3f621SBenjamin LaHaise int ret; 722d7f3f621SBenjamin LaHaise 7230a80966bSTom Herbert /* Verify checksum before giving to encap */ 7240a80966bSTom Herbert if (udp_lib_checksum_complete(skb)) 7250a80966bSTom Herbert goto csum_error; 7260a80966bSTom Herbert 727d7f3f621SBenjamin LaHaise ret = encap_rcv(sk, skb); 728d7f3f621SBenjamin LaHaise if (ret <= 0) { 729250962e4SMenglong Dong __UDP6_INC_STATS(sock_net(sk), 730d7f3f621SBenjamin LaHaise UDP_MIB_INDATAGRAMS, 731d7f3f621SBenjamin LaHaise is_udplite); 732d7f3f621SBenjamin LaHaise return -ret; 733d7f3f621SBenjamin LaHaise } 734d7f3f621SBenjamin LaHaise } 735d7f3f621SBenjamin LaHaise 736d7f3f621SBenjamin LaHaise /* FALLTHROUGH -- it's a UDP Packet */ 737d7f3f621SBenjamin LaHaise } 738d7f3f621SBenjamin LaHaise 739db8dac20SDavid S. Miller /* 740db8dac20SDavid S. Miller * UDP-Lite specific tests, ignored on UDP sockets (see net/ipv4/udp.c). 741db8dac20SDavid S. Miller */ 742b0a42277SMiaohe Lin if ((up->pcflag & UDPLITE_RECV_CC) && UDP_SKB_CB(skb)->partial_cov) { 743db8dac20SDavid S. Miller 744db8dac20SDavid S. Miller if (up->pcrlen == 0) { /* full coverage was set */ 745ba7a46f1SJoe Perches net_dbg_ratelimited("UDPLITE6: partial coverage %d while full coverage %d requested\n", 746db8dac20SDavid S. Miller UDP_SKB_CB(skb)->cscov, skb->len); 747db8dac20SDavid S. Miller goto drop; 748db8dac20SDavid S. Miller } 749db8dac20SDavid S. Miller if (UDP_SKB_CB(skb)->cscov < up->pcrlen) { 750ba7a46f1SJoe Perches net_dbg_ratelimited("UDPLITE6: coverage %d too small, need min %d\n", 751db8dac20SDavid S. Miller UDP_SKB_CB(skb)->cscov, up->pcrlen); 752db8dac20SDavid S. Miller goto drop; 753db8dac20SDavid S. Miller } 754db8dac20SDavid S. Miller } 755db8dac20SDavid S. Miller 7564b943faeSPaolo Abeni prefetch(&sk->sk_rmem_alloc); 757ce25d66aSEric Dumazet if (rcu_access_pointer(sk->sk_filter) && 758ce25d66aSEric Dumazet udp_lib_checksum_complete(skb)) 7596a5dc9e5SEric Dumazet goto csum_error; 760ce25d66aSEric Dumazet 7610d92efdeSDonald Hunter if (sk_filter_trim_cap(sk, skb, sizeof(struct udphdr))) { 7620d92efdeSDonald Hunter drop_reason = SKB_DROP_REASON_SOCKET_FILTER; 763a6127697SMichal Kubeček goto drop; 7640d92efdeSDonald Hunter } 765db8dac20SDavid S. Miller 766e6afc8acSsamanthakumar udp_csum_pull_header(skb); 767cb80ef46SBenjamin LaHaise 768d826eb14SEric Dumazet skb_dst_drop(skb); 769db8dac20SDavid S. Miller 770850cbaddSPaolo Abeni return __udpv6_queue_rcv_skb(sk, skb); 7713e215c8dSJames M Leddy 7726a5dc9e5SEric Dumazet csum_error: 7730d92efdeSDonald Hunter drop_reason = SKB_DROP_REASON_UDP_CSUM; 77402c22347SEric Dumazet __UDP6_INC_STATS(sock_net(sk), UDP_MIB_CSUMERRORS, is_udplite); 775db8dac20SDavid S. Miller drop: 77602c22347SEric Dumazet __UDP6_INC_STATS(sock_net(sk), UDP_MIB_INERRORS, is_udplite); 777cb80ef46SBenjamin LaHaise atomic_inc(&sk->sk_drops); 7780d92efdeSDonald Hunter kfree_skb_reason(skb, drop_reason); 779db8dac20SDavid S. Miller return -1; 780db8dac20SDavid S. Miller } 781db8dac20SDavid S. Miller 782cf329aa4SPaolo Abeni static int udpv6_queue_rcv_skb(struct sock *sk, struct sk_buff *skb) 783cf329aa4SPaolo Abeni { 784cf329aa4SPaolo Abeni struct sk_buff *next, *segs; 785cf329aa4SPaolo Abeni int ret; 786cf329aa4SPaolo Abeni 787cf329aa4SPaolo Abeni if (likely(!udp_unexpected_gso(sk, skb))) 788cf329aa4SPaolo Abeni return udpv6_queue_rcv_one_skb(sk, skb); 789cf329aa4SPaolo Abeni 790cf329aa4SPaolo Abeni __skb_push(skb, -skb_mac_offset(skb)); 791cf329aa4SPaolo Abeni segs = udp_rcv_segment(sk, skb, false); 7921a186c14SJason A. Donenfeld skb_list_walk_safe(segs, skb, next) { 793cf329aa4SPaolo Abeni __skb_pull(skb, skb_transport_offset(skb)); 794cf329aa4SPaolo Abeni 795000ac44dSPaolo Abeni udp_post_segment_fix_csum(skb); 796cf329aa4SPaolo Abeni ret = udpv6_queue_rcv_one_skb(sk, skb); 797cf329aa4SPaolo Abeni if (ret > 0) 798cf329aa4SPaolo Abeni ip6_protocol_deliver_rcu(dev_net(skb->dev), skb, ret, 799cf329aa4SPaolo Abeni true); 800cf329aa4SPaolo Abeni } 801cf329aa4SPaolo Abeni return 0; 802cf329aa4SPaolo Abeni } 803cf329aa4SPaolo Abeni 8045cf3d461SDavid Held static bool __udp_v6_is_mcast_sock(struct net *net, struct sock *sk, 805b71d1d42SEric Dumazet __be16 loc_port, const struct in6_addr *loc_addr, 806b71d1d42SEric Dumazet __be16 rmt_port, const struct in6_addr *rmt_addr, 8077bd2db40SDewi Morgan int dif, int sdif, unsigned short hnum) 808db8dac20SDavid S. Miller { 8099e89fd8bSSven Wegener struct inet_sock *inet = inet_sk(sk); 810db8dac20SDavid S. Miller 8119e89fd8bSSven Wegener if (!net_eq(sock_net(sk), net)) 8125cf3d461SDavid Held return false; 813b8ad0cbcSDaniel Lezcano 8145cf3d461SDavid Held if (udp_sk(sk)->udp_port_hash != hnum || 8155cf3d461SDavid Held sk->sk_family != PF_INET6 || 8165cf3d461SDavid Held (inet->inet_dport && inet->inet_dport != rmt_port) || 8175cf3d461SDavid Held (!ipv6_addr_any(&sk->sk_v6_daddr) && 8185cf3d461SDavid Held !ipv6_addr_equal(&sk->sk_v6_daddr, rmt_addr)) || 8194c971d2fSEric Dumazet !udp_sk_bound_dev_eq(net, READ_ONCE(sk->sk_bound_dev_if), dif, sdif) || 82033b4b015SHenning Rogge (!ipv6_addr_any(&sk->sk_v6_rcv_saddr) && 82133b4b015SHenning Rogge !ipv6_addr_equal(&sk->sk_v6_rcv_saddr, loc_addr))) 8225cf3d461SDavid Held return false; 8239e89fd8bSSven Wegener if (!inet6_mc_check(sk, loc_addr, rmt_addr)) 8245cf3d461SDavid Held return false; 8255cf3d461SDavid Held return true; 826db8dac20SDavid S. Miller } 827db8dac20SDavid S. Miller 8284068579eSTom Herbert static void udp6_csum_zero_error(struct sk_buff *skb) 8294068579eSTom Herbert { 8304068579eSTom Herbert /* RFC 2460 section 8.1 says that we SHOULD log 8314068579eSTom Herbert * this error. Well, it is reasonable. 8324068579eSTom Herbert */ 833ba7a46f1SJoe Perches net_dbg_ratelimited("IPv6: udp checksum is 0 for [%pI6c]:%u->[%pI6c]:%u\n", 8344068579eSTom Herbert &ipv6_hdr(skb)->saddr, ntohs(udp_hdr(skb)->source), 8354068579eSTom Herbert &ipv6_hdr(skb)->daddr, ntohs(udp_hdr(skb)->dest)); 8364068579eSTom Herbert } 8374068579eSTom Herbert 838db8dac20SDavid S. Miller /* 839db8dac20SDavid S. Miller * Note: called only from the BH handler context, 840db8dac20SDavid S. Miller * so we don't need to lock the hashes. 841db8dac20SDavid S. Miller */ 842e3163493SPavel Emelyanov static int __udp6_lib_mcast_deliver(struct net *net, struct sk_buff *skb, 843b71d1d42SEric Dumazet const struct in6_addr *saddr, const struct in6_addr *daddr, 84436cbb245SRick Jones struct udp_table *udptable, int proto) 845db8dac20SDavid S. Miller { 846ca065d0cSEric Dumazet struct sock *sk, *first = NULL; 847db8dac20SDavid S. Miller const struct udphdr *uh = udp_hdr(skb); 8485cf3d461SDavid Held unsigned short hnum = ntohs(uh->dest); 8495cf3d461SDavid Held struct udp_hslot *hslot = udp_hashslot(udptable, net, hnum); 850ca065d0cSEric Dumazet unsigned int offset = offsetof(typeof(*sk), sk_node); 8512dc41cffSDavid Held unsigned int hash2 = 0, hash2_any = 0, use_hash2 = (hslot->count > 10); 852ca065d0cSEric Dumazet int dif = inet6_iif(skb); 8537bd2db40SDewi Morgan int sdif = inet6_sdif(skb); 854ca065d0cSEric Dumazet struct hlist_node *node; 855ca065d0cSEric Dumazet struct sk_buff *nskb; 8562dc41cffSDavid Held 8572dc41cffSDavid Held if (use_hash2) { 858f0b1e64cSMartin KaFai Lau hash2_any = ipv6_portaddr_hash(net, &in6addr_any, hnum) & 85973e2d5e3SPablo Neira udptable->mask; 860f0b1e64cSMartin KaFai Lau hash2 = ipv6_portaddr_hash(net, daddr, hnum) & udptable->mask; 8612dc41cffSDavid Held start_lookup: 86273e2d5e3SPablo Neira hslot = &udptable->hash2[hash2]; 8632dc41cffSDavid Held offset = offsetof(typeof(*sk), __sk_common.skc_portaddr_node); 8642dc41cffSDavid Held } 865db8dac20SDavid S. Miller 866ca065d0cSEric Dumazet sk_for_each_entry_offset_rcu(sk, node, &hslot->head, offset) { 867ca065d0cSEric Dumazet if (!__udp_v6_is_mcast_sock(net, sk, uh->dest, daddr, 8687bd2db40SDewi Morgan uh->source, saddr, dif, sdif, 8697bd2db40SDewi Morgan hnum)) 870ca065d0cSEric Dumazet continue; 8711c19448cSTom Herbert /* If zero checksum and no_check is not on for 8724068579eSTom Herbert * the socket then skip it. 8734068579eSTom Herbert */ 874ca065d0cSEric Dumazet if (!uh->check && !udp_sk(sk)->no_check6_rx) 875ca065d0cSEric Dumazet continue; 876ca065d0cSEric Dumazet if (!first) { 877ca065d0cSEric Dumazet first = sk; 878ca065d0cSEric Dumazet continue; 879db8dac20SDavid S. Miller } 880ca065d0cSEric Dumazet nskb = skb_clone(skb, GFP_ATOMIC); 881ca065d0cSEric Dumazet if (unlikely(!nskb)) { 882ca065d0cSEric Dumazet atomic_inc(&sk->sk_drops); 88302c22347SEric Dumazet __UDP6_INC_STATS(net, UDP_MIB_RCVBUFERRORS, 884ca065d0cSEric Dumazet IS_UDPLITE(sk)); 88502c22347SEric Dumazet __UDP6_INC_STATS(net, UDP_MIB_INERRORS, 886ca065d0cSEric Dumazet IS_UDPLITE(sk)); 887ca065d0cSEric Dumazet continue; 888a1ab77f9SEric Dumazet } 889db8dac20SDavid S. Miller 890ca065d0cSEric Dumazet if (udpv6_queue_rcv_skb(sk, nskb) > 0) 891ca065d0cSEric Dumazet consume_skb(nskb); 892ca065d0cSEric Dumazet } 893a1ab77f9SEric Dumazet 8942dc41cffSDavid Held /* Also lookup *:port if we are using hash2 and haven't done so yet. */ 8952dc41cffSDavid Held if (use_hash2 && hash2 != hash2_any) { 8962dc41cffSDavid Held hash2 = hash2_any; 8972dc41cffSDavid Held goto start_lookup; 8982dc41cffSDavid Held } 8992dc41cffSDavid Held 900ca065d0cSEric Dumazet if (first) { 901ca065d0cSEric Dumazet if (udpv6_queue_rcv_skb(first, skb) > 0) 902ca065d0cSEric Dumazet consume_skb(skb); 903a1ab77f9SEric Dumazet } else { 904ca065d0cSEric Dumazet kfree_skb(skb); 90502c22347SEric Dumazet __UDP6_INC_STATS(net, UDP_MIB_IGNOREDMULTI, 90636cbb245SRick Jones proto == IPPROTO_UDPLITE); 907a1ab77f9SEric Dumazet } 908db8dac20SDavid S. Miller return 0; 909db8dac20SDavid S. Miller } 910db8dac20SDavid S. Miller 91164f0f5d1SPaolo Abeni static void udp6_sk_rx_dst_set(struct sock *sk, struct dst_entry *dst) 91264f0f5d1SPaolo Abeni { 91364f0f5d1SPaolo Abeni if (udp_sk_rx_dst_set(sk, dst)) { 91464f0f5d1SPaolo Abeni const struct rt6_info *rt = (const struct rt6_info *)dst; 91564f0f5d1SPaolo Abeni 916ef57c161SEric Dumazet sk->sk_rx_dst_cookie = rt6_get_cookie(rt); 91764f0f5d1SPaolo Abeni } 91864f0f5d1SPaolo Abeni } 91964f0f5d1SPaolo Abeni 920eb63f296SPaolo Abeni /* wrapper for udp_queue_rcv_skb tacking care of csum conversion and 921eb63f296SPaolo Abeni * return code conversion for ip layer consumption 922eb63f296SPaolo Abeni */ 923eb63f296SPaolo Abeni static int udp6_unicast_rcv_skb(struct sock *sk, struct sk_buff *skb, 924eb63f296SPaolo Abeni struct udphdr *uh) 925eb63f296SPaolo Abeni { 926eb63f296SPaolo Abeni int ret; 927eb63f296SPaolo Abeni 928eb63f296SPaolo Abeni if (inet_get_convert_csum(sk) && uh->check && !IS_UDPLITE(sk)) 929e4aa33adSLi RongQing skb_checksum_try_convert(skb, IPPROTO_UDP, ip6_compute_pseudo); 930eb63f296SPaolo Abeni 931eb63f296SPaolo Abeni ret = udpv6_queue_rcv_skb(sk, skb); 932eb63f296SPaolo Abeni 93384dad559SPaolo Abeni /* a return value > 0 means to resubmit the input */ 934eb63f296SPaolo Abeni if (ret > 0) 93584dad559SPaolo Abeni return ret; 936eb63f296SPaolo Abeni return 0; 937eb63f296SPaolo Abeni } 938eb63f296SPaolo Abeni 939645ca708SEric Dumazet int __udp6_lib_rcv(struct sk_buff *skb, struct udp_table *udptable, 940db8dac20SDavid S. Miller int proto) 941db8dac20SDavid S. Miller { 9424cf91f82SDavid Ahern enum skb_drop_reason reason = SKB_DROP_REASON_NOT_SPECIFIED; 943b71d1d42SEric Dumazet const struct in6_addr *saddr, *daddr; 944ca065d0cSEric Dumazet struct net *net = dev_net(skb->dev); 945ca065d0cSEric Dumazet struct udphdr *uh; 946ca065d0cSEric Dumazet struct sock *sk; 94771489e21SJoe Stringer bool refcounted; 948db8dac20SDavid S. Miller u32 ulen = 0; 949db8dac20SDavid S. Miller 950db8dac20SDavid S. Miller if (!pskb_may_pull(skb, sizeof(struct udphdr))) 951d6bc0149SBjørn Mork goto discard; 952db8dac20SDavid S. Miller 953db8dac20SDavid S. Miller saddr = &ipv6_hdr(skb)->saddr; 954db8dac20SDavid S. Miller daddr = &ipv6_hdr(skb)->daddr; 955db8dac20SDavid S. Miller uh = udp_hdr(skb); 956db8dac20SDavid S. Miller 957db8dac20SDavid S. Miller ulen = ntohs(uh->len); 958db8dac20SDavid S. Miller if (ulen > skb->len) 959db8dac20SDavid S. Miller goto short_packet; 960db8dac20SDavid S. Miller 961db8dac20SDavid S. Miller if (proto == IPPROTO_UDP) { 962db8dac20SDavid S. Miller /* UDP validates ulen. */ 963db8dac20SDavid S. Miller 964db8dac20SDavid S. Miller /* Check for jumbo payload */ 965db8dac20SDavid S. Miller if (ulen == 0) 966db8dac20SDavid S. Miller ulen = skb->len; 967db8dac20SDavid S. Miller 968db8dac20SDavid S. Miller if (ulen < sizeof(*uh)) 969db8dac20SDavid S. Miller goto short_packet; 970db8dac20SDavid S. Miller 971db8dac20SDavid S. Miller if (ulen < skb->len) { 972db8dac20SDavid S. Miller if (pskb_trim_rcsum(skb, ulen)) 973db8dac20SDavid S. Miller goto short_packet; 974db8dac20SDavid S. Miller saddr = &ipv6_hdr(skb)->saddr; 975db8dac20SDavid S. Miller daddr = &ipv6_hdr(skb)->daddr; 976db8dac20SDavid S. Miller uh = udp_hdr(skb); 977db8dac20SDavid S. Miller } 978db8dac20SDavid S. Miller } 979db8dac20SDavid S. Miller 980db8dac20SDavid S. Miller if (udp6_csum_init(skb, uh, proto)) 9816a5dc9e5SEric Dumazet goto csum_error; 982db8dac20SDavid S. Miller 983c9f2c1aeSPaolo Abeni /* Check if the socket is already available, e.g. due to early demux */ 98471489e21SJoe Stringer sk = skb_steal_sock(skb, &refcounted); 985c9f2c1aeSPaolo Abeni if (sk) { 986c9f2c1aeSPaolo Abeni struct dst_entry *dst = skb_dst(skb); 987c9f2c1aeSPaolo Abeni int ret; 988c9f2c1aeSPaolo Abeni 9898f905c0eSEric Dumazet if (unlikely(rcu_dereference(sk->sk_rx_dst) != dst)) 99064f0f5d1SPaolo Abeni udp6_sk_rx_dst_set(sk, dst); 991c9f2c1aeSPaolo Abeni 992eb63f296SPaolo Abeni if (!uh->check && !udp_sk(sk)->no_check6_rx) { 99371489e21SJoe Stringer if (refcounted) 994c9f2c1aeSPaolo Abeni sock_put(sk); 995eb63f296SPaolo Abeni goto report_csum_error; 996eb63f296SPaolo Abeni } 997c9f2c1aeSPaolo Abeni 998eb63f296SPaolo Abeni ret = udp6_unicast_rcv_skb(sk, skb, uh); 99971489e21SJoe Stringer if (refcounted) 1000eb63f296SPaolo Abeni sock_put(sk); 1001c9f2c1aeSPaolo Abeni return ret; 1002c9f2c1aeSPaolo Abeni } 1003c9f2c1aeSPaolo Abeni 1004db8dac20SDavid S. Miller /* 1005db8dac20SDavid S. Miller * Multicast receive code 1006db8dac20SDavid S. Miller */ 1007db8dac20SDavid S. Miller if (ipv6_addr_is_multicast(daddr)) 1008e3163493SPavel Emelyanov return __udp6_lib_mcast_deliver(net, skb, 100936cbb245SRick Jones saddr, daddr, udptable, proto); 1010db8dac20SDavid S. Miller 1011db8dac20SDavid S. Miller /* Unicast */ 1012607c4aafSKOVACS Krisztian sk = __udp6_lib_lookup_skb(skb, uh->source, uh->dest, udptable); 101353b24b8fSIan Morris if (sk) { 1014eb63f296SPaolo Abeni if (!uh->check && !udp_sk(sk)->no_check6_rx) 1015eb63f296SPaolo Abeni goto report_csum_error; 1016eb63f296SPaolo Abeni return udp6_unicast_rcv_skb(sk, skb, uh); 10174068579eSTom Herbert } 10184068579eSTom Herbert 10194cf91f82SDavid Ahern reason = SKB_DROP_REASON_NO_SOCKET; 10204cf91f82SDavid Ahern 1021eb63f296SPaolo Abeni if (!uh->check) 1022eb63f296SPaolo Abeni goto report_csum_error; 10234068579eSTom Herbert 1024db8dac20SDavid S. Miller if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) 1025db8dac20SDavid S. Miller goto discard; 1026db8dac20SDavid S. Miller 1027db8dac20SDavid S. Miller if (udp_lib_checksum_complete(skb)) 10286a5dc9e5SEric Dumazet goto csum_error; 1029db8dac20SDavid S. Miller 103002c22347SEric Dumazet __UDP6_INC_STATS(net, UDP_MIB_NOPORTS, proto == IPPROTO_UDPLITE); 10313ffe533cSAlexey Dobriyan icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0); 1032db8dac20SDavid S. Miller 10334cf91f82SDavid Ahern kfree_skb_reason(skb, reason); 1034db8dac20SDavid S. Miller return 0; 1035db8dac20SDavid S. Miller 1036db8dac20SDavid S. Miller short_packet: 10374cf91f82SDavid Ahern if (reason == SKB_DROP_REASON_NOT_SPECIFIED) 10384cf91f82SDavid Ahern reason = SKB_DROP_REASON_PKT_TOO_SMALL; 1039ba7a46f1SJoe Perches net_dbg_ratelimited("UDP%sv6: short packet: From [%pI6c]:%u %d/%d to [%pI6c]:%u\n", 1040db8dac20SDavid S. Miller proto == IPPROTO_UDPLITE ? "-Lite" : "", 1041ba7a46f1SJoe Perches saddr, ntohs(uh->source), 1042ba7a46f1SJoe Perches ulen, skb->len, 1043ba7a46f1SJoe Perches daddr, ntohs(uh->dest)); 10446a5dc9e5SEric Dumazet goto discard; 1045eb63f296SPaolo Abeni 1046eb63f296SPaolo Abeni report_csum_error: 1047eb63f296SPaolo Abeni udp6_csum_zero_error(skb); 10486a5dc9e5SEric Dumazet csum_error: 10494cf91f82SDavid Ahern if (reason == SKB_DROP_REASON_NOT_SPECIFIED) 10504cf91f82SDavid Ahern reason = SKB_DROP_REASON_UDP_CSUM; 105102c22347SEric Dumazet __UDP6_INC_STATS(net, UDP_MIB_CSUMERRORS, proto == IPPROTO_UDPLITE); 1052db8dac20SDavid S. Miller discard: 105302c22347SEric Dumazet __UDP6_INC_STATS(net, UDP_MIB_INERRORS, proto == IPPROTO_UDPLITE); 10544cf91f82SDavid Ahern kfree_skb_reason(skb, reason); 1055db8dac20SDavid S. Miller return 0; 1056db8dac20SDavid S. Miller } 1057db8dac20SDavid S. Miller 10580bd84065Ssubashab@codeaurora.org 10595425077dSsubashab@codeaurora.org static struct sock *__udp6_lib_demux_lookup(struct net *net, 10605425077dSsubashab@codeaurora.org __be16 loc_port, const struct in6_addr *loc_addr, 10615425077dSsubashab@codeaurora.org __be16 rmt_port, const struct in6_addr *rmt_addr, 10624297a0efSDavid Ahern int dif, int sdif) 10635425077dSsubashab@codeaurora.org { 10640bd84065Ssubashab@codeaurora.org unsigned short hnum = ntohs(loc_port); 1065f0b1e64cSMartin KaFai Lau unsigned int hash2 = ipv6_portaddr_hash(net, loc_addr, hnum); 10660bd84065Ssubashab@codeaurora.org unsigned int slot2 = hash2 & udp_table.mask; 10670bd84065Ssubashab@codeaurora.org struct udp_hslot *hslot2 = &udp_table.hash2[slot2]; 10680bd84065Ssubashab@codeaurora.org const __portpair ports = INET_COMBINED_PORTS(rmt_port, hnum); 10695425077dSsubashab@codeaurora.org struct sock *sk; 10705425077dSsubashab@codeaurora.org 10710bd84065Ssubashab@codeaurora.org udp_portaddr_for_each_entry_rcu(sk, &hslot2->head) { 107285cb73ffSWei Wang if (sk->sk_state == TCP_ESTABLISHED && 10735d368f03SEric Dumazet inet6_match(net, sk, rmt_addr, loc_addr, ports, dif, sdif)) 10745425077dSsubashab@codeaurora.org return sk; 10750bd84065Ssubashab@codeaurora.org /* Only check first socket in chain */ 10760bd84065Ssubashab@codeaurora.org break; 10770bd84065Ssubashab@codeaurora.org } 10780bd84065Ssubashab@codeaurora.org return NULL; 10795425077dSsubashab@codeaurora.org } 10805425077dSsubashab@codeaurora.org 108111052589SKuniyuki Iwashima void udp_v6_early_demux(struct sk_buff *skb) 10825425077dSsubashab@codeaurora.org { 10835425077dSsubashab@codeaurora.org struct net *net = dev_net(skb->dev); 10845425077dSsubashab@codeaurora.org const struct udphdr *uh; 10855425077dSsubashab@codeaurora.org struct sock *sk; 10865425077dSsubashab@codeaurora.org struct dst_entry *dst; 10875425077dSsubashab@codeaurora.org int dif = skb->dev->ifindex; 10884297a0efSDavid Ahern int sdif = inet6_sdif(skb); 10895425077dSsubashab@codeaurora.org 10905425077dSsubashab@codeaurora.org if (!pskb_may_pull(skb, skb_transport_offset(skb) + 10915425077dSsubashab@codeaurora.org sizeof(struct udphdr))) 10925425077dSsubashab@codeaurora.org return; 10935425077dSsubashab@codeaurora.org 10945425077dSsubashab@codeaurora.org uh = udp_hdr(skb); 10955425077dSsubashab@codeaurora.org 10965425077dSsubashab@codeaurora.org if (skb->pkt_type == PACKET_HOST) 10975425077dSsubashab@codeaurora.org sk = __udp6_lib_demux_lookup(net, uh->dest, 10985425077dSsubashab@codeaurora.org &ipv6_hdr(skb)->daddr, 10995425077dSsubashab@codeaurora.org uh->source, &ipv6_hdr(skb)->saddr, 11004297a0efSDavid Ahern dif, sdif); 11015425077dSsubashab@codeaurora.org else 11025425077dSsubashab@codeaurora.org return; 11035425077dSsubashab@codeaurora.org 110441c6d650SReshetova, Elena if (!sk || !refcount_inc_not_zero(&sk->sk_refcnt)) 11055425077dSsubashab@codeaurora.org return; 11065425077dSsubashab@codeaurora.org 11075425077dSsubashab@codeaurora.org skb->sk = sk; 11085425077dSsubashab@codeaurora.org skb->destructor = sock_efree; 11098f905c0eSEric Dumazet dst = rcu_dereference(sk->sk_rx_dst); 11105425077dSsubashab@codeaurora.org 11115425077dSsubashab@codeaurora.org if (dst) 1112ef57c161SEric Dumazet dst = dst_check(dst, sk->sk_rx_dst_cookie); 11135425077dSsubashab@codeaurora.org if (dst) { 1114d24406c8SWei Wang /* set noref for now. 1115d24406c8SWei Wang * any place which wants to hold dst has to call 1116d24406c8SWei Wang * dst_hold_safe() 1117d24406c8SWei Wang */ 11185425077dSsubashab@codeaurora.org skb_dst_set_noref(skb, dst); 11195425077dSsubashab@codeaurora.org } 11205425077dSsubashab@codeaurora.org } 11215425077dSsubashab@codeaurora.org 11220e219ae4SPaolo Abeni INDIRECT_CALLABLE_SCOPE int udpv6_rcv(struct sk_buff *skb) 1123db8dac20SDavid S. Miller { 1124645ca708SEric Dumazet return __udp6_lib_rcv(skb, &udp_table, IPPROTO_UDP); 1125db8dac20SDavid S. Miller } 1126db8dac20SDavid S. Miller 1127db8dac20SDavid S. Miller /* 1128db8dac20SDavid S. Miller * Throw away all pending data and cancel the corking. Socket is locked. 1129db8dac20SDavid S. Miller */ 1130db8dac20SDavid S. Miller static void udp_v6_flush_pending_frames(struct sock *sk) 1131db8dac20SDavid S. Miller { 1132db8dac20SDavid S. Miller struct udp_sock *up = udp_sk(sk); 1133db8dac20SDavid S. Miller 113436d926b9SDenis V. Lunev if (up->pending == AF_INET) 113536d926b9SDenis V. Lunev udp_flush_pending_frames(sk); 113636d926b9SDenis V. Lunev else if (up->pending) { 1137db8dac20SDavid S. Miller up->len = 0; 1138db8dac20SDavid S. Miller up->pending = 0; 1139db8dac20SDavid S. Miller ip6_flush_pending_frames(sk); 1140db8dac20SDavid S. Miller } 1141db8dac20SDavid S. Miller } 1142db8dac20SDavid S. Miller 1143d74bad4eSAndrey Ignatov static int udpv6_pre_connect(struct sock *sk, struct sockaddr *uaddr, 1144d74bad4eSAndrey Ignatov int addr_len) 1145d74bad4eSAndrey Ignatov { 1146bddc028aSTetsuo Handa if (addr_len < offsetofend(struct sockaddr, sa_family)) 1147bddc028aSTetsuo Handa return -EINVAL; 1148d74bad4eSAndrey Ignatov /* The following checks are replicated from __ip6_datagram_connect() 1149d74bad4eSAndrey Ignatov * and intended to prevent BPF program called below from accessing 1150d74bad4eSAndrey Ignatov * bytes that are out of the bound specified by user in addr_len. 1151d74bad4eSAndrey Ignatov */ 1152d74bad4eSAndrey Ignatov if (uaddr->sa_family == AF_INET) { 115389e9c728SKuniyuki Iwashima if (ipv6_only_sock(sk)) 1154d74bad4eSAndrey Ignatov return -EAFNOSUPPORT; 1155d74bad4eSAndrey Ignatov return udp_pre_connect(sk, uaddr, addr_len); 1156d74bad4eSAndrey Ignatov } 1157d74bad4eSAndrey Ignatov 1158d74bad4eSAndrey Ignatov if (addr_len < SIN6_LEN_RFC2133) 1159d74bad4eSAndrey Ignatov return -EINVAL; 1160d74bad4eSAndrey Ignatov 1161d74bad4eSAndrey Ignatov return BPF_CGROUP_RUN_PROG_INET6_CONNECT_LOCK(sk, uaddr); 1162d74bad4eSAndrey Ignatov } 1163d74bad4eSAndrey Ignatov 1164493c6be3SSridhar Samudrala /** 1165493c6be3SSridhar Samudrala * udp6_hwcsum_outgoing - handle outgoing HW checksumming 1166493c6be3SSridhar Samudrala * @sk: socket we are sending on 1167493c6be3SSridhar Samudrala * @skb: sk_buff containing the filled-in UDP header 1168493c6be3SSridhar Samudrala * (checksum field must be zeroed out) 1169b51cd7c8SAndrew Lunn * @saddr: source address 1170b51cd7c8SAndrew Lunn * @daddr: destination address 1171b51cd7c8SAndrew Lunn * @len: length of packet 1172493c6be3SSridhar Samudrala */ 1173493c6be3SSridhar Samudrala static void udp6_hwcsum_outgoing(struct sock *sk, struct sk_buff *skb, 1174493c6be3SSridhar Samudrala const struct in6_addr *saddr, 1175493c6be3SSridhar Samudrala const struct in6_addr *daddr, int len) 1176493c6be3SSridhar Samudrala { 1177493c6be3SSridhar Samudrala unsigned int offset; 1178493c6be3SSridhar Samudrala struct udphdr *uh = udp_hdr(skb); 1179d39d938cSVlad Yasevich struct sk_buff *frags = skb_shinfo(skb)->frag_list; 1180493c6be3SSridhar Samudrala __wsum csum = 0; 1181493c6be3SSridhar Samudrala 1182d39d938cSVlad Yasevich if (!frags) { 1183493c6be3SSridhar Samudrala /* Only one fragment on the socket. */ 1184493c6be3SSridhar Samudrala skb->csum_start = skb_transport_header(skb) - skb->head; 1185493c6be3SSridhar Samudrala skb->csum_offset = offsetof(struct udphdr, check); 1186493c6be3SSridhar Samudrala uh->check = ~csum_ipv6_magic(saddr, daddr, len, IPPROTO_UDP, 0); 1187493c6be3SSridhar Samudrala } else { 1188493c6be3SSridhar Samudrala /* 1189493c6be3SSridhar Samudrala * HW-checksum won't work as there are two or more 1190493c6be3SSridhar Samudrala * fragments on the socket so that all csums of sk_buffs 1191493c6be3SSridhar Samudrala * should be together 1192493c6be3SSridhar Samudrala */ 1193493c6be3SSridhar Samudrala offset = skb_transport_offset(skb); 1194493c6be3SSridhar Samudrala skb->csum = skb_checksum(skb, offset, skb->len - offset, 0); 119563ecc3d9SSubash Abhinov Kasiviswanathan csum = skb->csum; 1196493c6be3SSridhar Samudrala 1197493c6be3SSridhar Samudrala skb->ip_summed = CHECKSUM_NONE; 1198493c6be3SSridhar Samudrala 1199d39d938cSVlad Yasevich do { 1200d39d938cSVlad Yasevich csum = csum_add(csum, frags->csum); 1201d39d938cSVlad Yasevich } while ((frags = frags->next)); 1202493c6be3SSridhar Samudrala 1203493c6be3SSridhar Samudrala uh->check = csum_ipv6_magic(saddr, daddr, len, IPPROTO_UDP, 1204493c6be3SSridhar Samudrala csum); 1205493c6be3SSridhar Samudrala if (uh->check == 0) 1206493c6be3SSridhar Samudrala uh->check = CSUM_MANGLED_0; 1207493c6be3SSridhar Samudrala } 1208493c6be3SSridhar Samudrala } 1209493c6be3SSridhar Samudrala 1210db8dac20SDavid S. Miller /* 1211db8dac20SDavid S. Miller * Sending 1212db8dac20SDavid S. Miller */ 1213db8dac20SDavid S. Miller 1214bec1f6f6SWillem de Bruijn static int udp_v6_send_skb(struct sk_buff *skb, struct flowi6 *fl6, 1215bec1f6f6SWillem de Bruijn struct inet_cork *cork) 1216db8dac20SDavid S. Miller { 1217d39d938cSVlad Yasevich struct sock *sk = skb->sk; 1218db8dac20SDavid S. Miller struct udphdr *uh; 1219db8dac20SDavid S. Miller int err = 0; 1220db8dac20SDavid S. Miller int is_udplite = IS_UDPLITE(sk); 1221db8dac20SDavid S. Miller __wsum csum = 0; 1222d39d938cSVlad Yasevich int offset = skb_transport_offset(skb); 1223d39d938cSVlad Yasevich int len = skb->len - offset; 12244094871dSJosh Hunt int datalen = len - sizeof(*uh); 1225db8dac20SDavid S. Miller 1226db8dac20SDavid S. Miller /* 1227db8dac20SDavid S. Miller * Create a UDP header 1228db8dac20SDavid S. Miller */ 1229db8dac20SDavid S. Miller uh = udp_hdr(skb); 12301958b856SDavid S. Miller uh->source = fl6->fl6_sport; 12311958b856SDavid S. Miller uh->dest = fl6->fl6_dport; 1232d39d938cSVlad Yasevich uh->len = htons(len); 1233db8dac20SDavid S. Miller uh->check = 0; 1234db8dac20SDavid S. Miller 1235bec1f6f6SWillem de Bruijn if (cork->gso_size) { 1236bec1f6f6SWillem de Bruijn const int hlen = skb_network_header_len(skb) + 1237bec1f6f6SWillem de Bruijn sizeof(struct udphdr); 1238bec1f6f6SWillem de Bruijn 12390f149c9fSWillem de Bruijn if (hlen + cork->gso_size > cork->fragsize) { 12400f149c9fSWillem de Bruijn kfree_skb(skb); 1241bec1f6f6SWillem de Bruijn return -EINVAL; 12420f149c9fSWillem de Bruijn } 1243736ef37fSCoco Li if (datalen > cork->gso_size * UDP_MAX_SEGMENTS) { 12440f149c9fSWillem de Bruijn kfree_skb(skb); 1245bec1f6f6SWillem de Bruijn return -EINVAL; 12460f149c9fSWillem de Bruijn } 12470f149c9fSWillem de Bruijn if (udp_sk(sk)->no_check6_tx) { 12480f149c9fSWillem de Bruijn kfree_skb(skb); 1249a8c744a8SWillem de Bruijn return -EINVAL; 12500f149c9fSWillem de Bruijn } 1251ff06342cSWillem de Bruijn if (skb->ip_summed != CHECKSUM_PARTIAL || is_udplite || 12520f149c9fSWillem de Bruijn dst_xfrm(skb_dst(skb))) { 12530f149c9fSWillem de Bruijn kfree_skb(skb); 1254bec1f6f6SWillem de Bruijn return -EIO; 12550f149c9fSWillem de Bruijn } 1256bec1f6f6SWillem de Bruijn 12574094871dSJosh Hunt if (datalen > cork->gso_size) { 1258bec1f6f6SWillem de Bruijn skb_shinfo(skb)->gso_size = cork->gso_size; 1259bec1f6f6SWillem de Bruijn skb_shinfo(skb)->gso_type = SKB_GSO_UDP_L4; 12604094871dSJosh Hunt skb_shinfo(skb)->gso_segs = DIV_ROUND_UP(datalen, 126144b321e5SJosh Hunt cork->gso_size); 12624094871dSJosh Hunt } 1263a8c744a8SWillem de Bruijn goto csum_partial; 1264bec1f6f6SWillem de Bruijn } 1265bec1f6f6SWillem de Bruijn 1266db8dac20SDavid S. Miller if (is_udplite) 1267d39d938cSVlad Yasevich csum = udplite_csum(skb); 1268d39d938cSVlad Yasevich else if (udp_sk(sk)->no_check6_tx) { /* UDP csum disabled */ 12694068579eSTom Herbert skb->ip_summed = CHECKSUM_NONE; 12704068579eSTom Herbert goto send; 12714068579eSTom Herbert } else if (skb->ip_summed == CHECKSUM_PARTIAL) { /* UDP hardware csum */ 1272a8c744a8SWillem de Bruijn csum_partial: 1273d39d938cSVlad Yasevich udp6_hwcsum_outgoing(sk, skb, &fl6->saddr, &fl6->daddr, len); 1274493c6be3SSridhar Samudrala goto send; 1275493c6be3SSridhar Samudrala } else 1276d39d938cSVlad Yasevich csum = udp_csum(skb); 1277db8dac20SDavid S. Miller 1278db8dac20SDavid S. Miller /* add protocol-dependent pseudo-header */ 12794c9483b2SDavid S. Miller uh->check = csum_ipv6_magic(&fl6->saddr, &fl6->daddr, 1280d39d938cSVlad Yasevich len, fl6->flowi6_proto, csum); 1281db8dac20SDavid S. Miller if (uh->check == 0) 1282db8dac20SDavid S. Miller uh->check = CSUM_MANGLED_0; 1283db8dac20SDavid S. Miller 1284493c6be3SSridhar Samudrala send: 1285d39d938cSVlad Yasevich err = ip6_send_skb(skb); 12866ce9e7b5SEric Dumazet if (err) { 12876ce9e7b5SEric Dumazet if (err == -ENOBUFS && !inet6_sk(sk)->recverr) { 12886aef70a8SEric Dumazet UDP6_INC_STATS(sock_net(sk), 12896ce9e7b5SEric Dumazet UDP_MIB_SNDBUFERRORS, is_udplite); 12906ce9e7b5SEric Dumazet err = 0; 12916ce9e7b5SEric Dumazet } 12926aef70a8SEric Dumazet } else { 12936aef70a8SEric Dumazet UDP6_INC_STATS(sock_net(sk), 12946ce9e7b5SEric Dumazet UDP_MIB_OUTDATAGRAMS, is_udplite); 12956aef70a8SEric Dumazet } 1296d39d938cSVlad Yasevich return err; 1297d39d938cSVlad Yasevich } 1298d39d938cSVlad Yasevich 1299d39d938cSVlad Yasevich static int udp_v6_push_pending_frames(struct sock *sk) 1300d39d938cSVlad Yasevich { 1301d39d938cSVlad Yasevich struct sk_buff *skb; 1302d39d938cSVlad Yasevich struct udp_sock *up = udp_sk(sk); 1303d39d938cSVlad Yasevich int err = 0; 1304d39d938cSVlad Yasevich 1305d39d938cSVlad Yasevich if (up->pending == AF_INET) 1306d39d938cSVlad Yasevich return udp_push_pending_frames(sk); 1307d39d938cSVlad Yasevich 1308d39d938cSVlad Yasevich skb = ip6_finish_skb(sk); 1309d39d938cSVlad Yasevich if (!skb) 1310d39d938cSVlad Yasevich goto out; 1311d39d938cSVlad Yasevich 1312940ea00bSPavel Begunkov err = udp_v6_send_skb(skb, &inet_sk(sk)->cork.fl.u.ip6, 1313940ea00bSPavel Begunkov &inet_sk(sk)->cork.base); 1314db8dac20SDavid S. Miller out: 1315db8dac20SDavid S. Miller up->len = 0; 1316db8dac20SDavid S. Miller up->pending = 0; 1317db8dac20SDavid S. Miller return err; 1318db8dac20SDavid S. Miller } 1319db8dac20SDavid S. Miller 13201b784140SYing Xue int udpv6_sendmsg(struct sock *sk, struct msghdr *msg, size_t len) 1321db8dac20SDavid S. Miller { 1322db8dac20SDavid S. Miller struct ipv6_txoptions opt_space; 1323db8dac20SDavid S. Miller struct udp_sock *up = udp_sk(sk); 1324db8dac20SDavid S. Miller struct inet_sock *inet = inet_sk(sk); 1325db8dac20SDavid S. Miller struct ipv6_pinfo *np = inet6_sk(sk); 1326342dfc30SSteffen Hurrle DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, msg->msg_name); 132720c59de2SArnaud Ebalard struct in6_addr *daddr, *final_p, final; 1328db8dac20SDavid S. Miller struct ipv6_txoptions *opt = NULL; 132945f6fad8SEric Dumazet struct ipv6_txoptions *opt_to_free = NULL; 1330db8dac20SDavid S. Miller struct ip6_flowlabel *flowlabel = NULL; 13315298953eSPavel Begunkov struct inet_cork_full cork; 13325298953eSPavel Begunkov struct flowi6 *fl6 = &cork.fl.u.ip6; 1333db8dac20SDavid S. Miller struct dst_entry *dst; 133426879da5SWei Wang struct ipcm6_cookie ipc6; 1335db8dac20SDavid S. Miller int addr_len = msg->msg_namelen; 13369f542f61SAlexey Kodanev bool connected = false; 1337db8dac20SDavid S. Miller int ulen = len; 1338a9f59707SEric Dumazet int corkreq = READ_ONCE(up->corkflag) || msg->msg_flags&MSG_MORE; 1339db8dac20SDavid S. Miller int err; 1340db8dac20SDavid S. Miller int is_udplite = IS_UDPLITE(sk); 1341db8dac20SDavid S. Miller int (*getfrag)(void *, char *, int, int, int, struct sk_buff *); 1342db8dac20SDavid S. Miller 1343b515430aSWillem de Bruijn ipcm6_init(&ipc6); 134418a419baSEric Dumazet ipc6.gso_size = READ_ONCE(up->gso_size); 13455fdaa88dSWillem de Bruijn ipc6.sockc.tsflags = sk->sk_tsflags; 1346c6af0c22SWillem de Bruijn ipc6.sockc.mark = sk->sk_mark; 134726879da5SWei Wang 1348db8dac20SDavid S. Miller /* destination address check */ 1349db8dac20SDavid S. Miller if (sin6) { 1350db8dac20SDavid S. Miller if (addr_len < offsetof(struct sockaddr, sa_data)) 1351db8dac20SDavid S. Miller return -EINVAL; 1352db8dac20SDavid S. Miller 1353db8dac20SDavid S. Miller switch (sin6->sin6_family) { 1354db8dac20SDavid S. Miller case AF_INET6: 1355db8dac20SDavid S. Miller if (addr_len < SIN6_LEN_RFC2133) 1356db8dac20SDavid S. Miller return -EINVAL; 1357db8dac20SDavid S. Miller daddr = &sin6->sin6_addr; 1358052d2369SJonathan T. Leighton if (ipv6_addr_any(daddr) && 1359052d2369SJonathan T. Leighton ipv6_addr_v4mapped(&np->saddr)) 1360052d2369SJonathan T. Leighton ipv6_addr_set_v4mapped(htonl(INADDR_LOOPBACK), 1361052d2369SJonathan T. Leighton daddr); 1362db8dac20SDavid S. Miller break; 1363db8dac20SDavid S. Miller case AF_INET: 1364db8dac20SDavid S. Miller goto do_udp_sendmsg; 1365db8dac20SDavid S. Miller case AF_UNSPEC: 1366db8dac20SDavid S. Miller msg->msg_name = sin6 = NULL; 1367db8dac20SDavid S. Miller msg->msg_namelen = addr_len = 0; 1368db8dac20SDavid S. Miller daddr = NULL; 1369db8dac20SDavid S. Miller break; 1370db8dac20SDavid S. Miller default: 1371db8dac20SDavid S. Miller return -EINVAL; 1372db8dac20SDavid S. Miller } 1373db8dac20SDavid S. Miller } else if (!up->pending) { 1374db8dac20SDavid S. Miller if (sk->sk_state != TCP_ESTABLISHED) 1375db8dac20SDavid S. Miller return -EDESTADDRREQ; 1376efe4208fSEric Dumazet daddr = &sk->sk_v6_daddr; 1377db8dac20SDavid S. Miller } else 1378db8dac20SDavid S. Miller daddr = NULL; 1379db8dac20SDavid S. Miller 1380db8dac20SDavid S. Miller if (daddr) { 1381db8dac20SDavid S. Miller if (ipv6_addr_v4mapped(daddr)) { 1382db8dac20SDavid S. Miller struct sockaddr_in sin; 1383db8dac20SDavid S. Miller sin.sin_family = AF_INET; 1384c720c7e8SEric Dumazet sin.sin_port = sin6 ? sin6->sin6_port : inet->inet_dport; 1385db8dac20SDavid S. Miller sin.sin_addr.s_addr = daddr->s6_addr32[3]; 1386db8dac20SDavid S. Miller msg->msg_name = &sin; 1387db8dac20SDavid S. Miller msg->msg_namelen = sizeof(sin); 1388db8dac20SDavid S. Miller do_udp_sendmsg: 138989e9c728SKuniyuki Iwashima if (ipv6_only_sock(sk)) 1390db8dac20SDavid S. Miller return -ENETUNREACH; 13911b784140SYing Xue return udp_sendmsg(sk, msg, len); 1392db8dac20SDavid S. Miller } 1393db8dac20SDavid S. Miller } 1394db8dac20SDavid S. Miller 1395db8dac20SDavid S. Miller /* Rough check on arithmetic overflow, 1396db8dac20SDavid S. Miller better check is made in ip6_append_data(). 1397db8dac20SDavid S. Miller */ 1398db8dac20SDavid S. Miller if (len > INT_MAX - sizeof(struct udphdr)) 1399db8dac20SDavid S. Miller return -EMSGSIZE; 1400db8dac20SDavid S. Miller 140103485f2aSVlad Yasevich getfrag = is_udplite ? udplite_getfrag : ip_generic_getfrag; 1402db8dac20SDavid S. Miller if (up->pending) { 1403406c4a0aSPavel Begunkov if (up->pending == AF_INET) 1404406c4a0aSPavel Begunkov return udp_sendmsg(sk, msg, len); 1405db8dac20SDavid S. Miller /* 1406db8dac20SDavid S. Miller * There are pending frames. 1407db8dac20SDavid S. Miller * The socket lock must be held while it's corked. 1408db8dac20SDavid S. Miller */ 1409db8dac20SDavid S. Miller lock_sock(sk); 1410db8dac20SDavid S. Miller if (likely(up->pending)) { 1411db8dac20SDavid S. Miller if (unlikely(up->pending != AF_INET6)) { 1412db8dac20SDavid S. Miller release_sock(sk); 1413db8dac20SDavid S. Miller return -EAFNOSUPPORT; 1414db8dac20SDavid S. Miller } 1415db8dac20SDavid S. Miller dst = NULL; 1416db8dac20SDavid S. Miller goto do_append_data; 1417db8dac20SDavid S. Miller } 1418db8dac20SDavid S. Miller release_sock(sk); 1419db8dac20SDavid S. Miller } 1420db8dac20SDavid S. Miller ulen += sizeof(struct udphdr); 1421db8dac20SDavid S. Miller 14225298953eSPavel Begunkov memset(fl6, 0, sizeof(*fl6)); 1423db8dac20SDavid S. Miller 1424db8dac20SDavid S. Miller if (sin6) { 1425db8dac20SDavid S. Miller if (sin6->sin6_port == 0) 1426db8dac20SDavid S. Miller return -EINVAL; 1427db8dac20SDavid S. Miller 14285298953eSPavel Begunkov fl6->fl6_dport = sin6->sin6_port; 1429db8dac20SDavid S. Miller daddr = &sin6->sin6_addr; 1430db8dac20SDavid S. Miller 1431db8dac20SDavid S. Miller if (np->sndflow) { 14325298953eSPavel Begunkov fl6->flowlabel = sin6->sin6_flowinfo&IPV6_FLOWINFO_MASK; 14335298953eSPavel Begunkov if (fl6->flowlabel & IPV6_FLOWLABEL_MASK) { 14345298953eSPavel Begunkov flowlabel = fl6_sock_lookup(sk, fl6->flowlabel); 143559c820b2SWillem de Bruijn if (IS_ERR(flowlabel)) 1436db8dac20SDavid S. Miller return -EINVAL; 1437db8dac20SDavid S. Miller } 1438db8dac20SDavid S. Miller } 1439db8dac20SDavid S. Miller 1440db8dac20SDavid S. Miller /* 1441db8dac20SDavid S. Miller * Otherwise it will be difficult to maintain 1442db8dac20SDavid S. Miller * sk->sk_dst_cache. 1443db8dac20SDavid S. Miller */ 1444db8dac20SDavid S. Miller if (sk->sk_state == TCP_ESTABLISHED && 1445efe4208fSEric Dumazet ipv6_addr_equal(daddr, &sk->sk_v6_daddr)) 1446efe4208fSEric Dumazet daddr = &sk->sk_v6_daddr; 1447db8dac20SDavid S. Miller 1448db8dac20SDavid S. Miller if (addr_len >= sizeof(struct sockaddr_in6) && 1449db8dac20SDavid S. Miller sin6->sin6_scope_id && 1450842df073SHannes Frederic Sowa __ipv6_addr_needs_scope_id(__ipv6_addr_type(daddr))) 14515298953eSPavel Begunkov fl6->flowi6_oif = sin6->sin6_scope_id; 1452db8dac20SDavid S. Miller } else { 1453db8dac20SDavid S. Miller if (sk->sk_state != TCP_ESTABLISHED) 1454db8dac20SDavid S. Miller return -EDESTADDRREQ; 1455db8dac20SDavid S. Miller 14565298953eSPavel Begunkov fl6->fl6_dport = inet->inet_dport; 1457efe4208fSEric Dumazet daddr = &sk->sk_v6_daddr; 14585298953eSPavel Begunkov fl6->flowlabel = np->flow_label; 14599f542f61SAlexey Kodanev connected = true; 1460db8dac20SDavid S. Miller } 1461db8dac20SDavid S. Miller 14625298953eSPavel Begunkov if (!fl6->flowi6_oif) 14634c971d2fSEric Dumazet fl6->flowi6_oif = READ_ONCE(sk->sk_bound_dev_if); 1464db8dac20SDavid S. Miller 14655298953eSPavel Begunkov if (!fl6->flowi6_oif) 14665298953eSPavel Begunkov fl6->flowi6_oif = np->sticky_pktinfo.ipi6_ifindex; 14679f690db7SYang Hongyang 14685298953eSPavel Begunkov fl6->flowi6_uid = sk->sk_uid; 146951953d5bSBrian Haley 1470db8dac20SDavid S. Miller if (msg->msg_controllen) { 1471db8dac20SDavid S. Miller opt = &opt_space; 1472db8dac20SDavid S. Miller memset(opt, 0, sizeof(struct ipv6_txoptions)); 1473db8dac20SDavid S. Miller opt->tot_len = sizeof(*opt); 147426879da5SWei Wang ipc6.opt = opt; 1475db8dac20SDavid S. Miller 14762e8de857SWillem de Bruijn err = udp_cmsg_send(sk, msg, &ipc6.gso_size); 14772e8de857SWillem de Bruijn if (err > 0) 14785298953eSPavel Begunkov err = ip6_datagram_send_ctl(sock_net(sk), sk, msg, fl6, 14795fdaa88dSWillem de Bruijn &ipc6); 1480db8dac20SDavid S. Miller if (err < 0) { 1481db8dac20SDavid S. Miller fl6_sock_release(flowlabel); 1482db8dac20SDavid S. Miller return err; 1483db8dac20SDavid S. Miller } 14845298953eSPavel Begunkov if ((fl6->flowlabel&IPV6_FLOWLABEL_MASK) && !flowlabel) { 14855298953eSPavel Begunkov flowlabel = fl6_sock_lookup(sk, fl6->flowlabel); 148659c820b2SWillem de Bruijn if (IS_ERR(flowlabel)) 1487db8dac20SDavid S. Miller return -EINVAL; 1488db8dac20SDavid S. Miller } 1489db8dac20SDavid S. Miller if (!(opt->opt_nflen|opt->opt_flen)) 1490db8dac20SDavid S. Miller opt = NULL; 14919f542f61SAlexey Kodanev connected = false; 1492db8dac20SDavid S. Miller } 149345f6fad8SEric Dumazet if (!opt) { 149445f6fad8SEric Dumazet opt = txopt_get(np); 149545f6fad8SEric Dumazet opt_to_free = opt; 149645f6fad8SEric Dumazet } 1497db8dac20SDavid S. Miller if (flowlabel) 1498db8dac20SDavid S. Miller opt = fl6_merge_options(&opt_space, flowlabel, opt); 1499db8dac20SDavid S. Miller opt = ipv6_fixup_options(&opt_space, opt); 150026879da5SWei Wang ipc6.opt = opt; 1501db8dac20SDavid S. Miller 15025298953eSPavel Begunkov fl6->flowi6_proto = sk->sk_protocol; 15035298953eSPavel Begunkov fl6->flowi6_mark = ipc6.sockc.mark; 15045298953eSPavel Begunkov fl6->daddr = *daddr; 15055298953eSPavel Begunkov if (ipv6_addr_any(&fl6->saddr) && !ipv6_addr_any(&np->saddr)) 15065298953eSPavel Begunkov fl6->saddr = np->saddr; 15075298953eSPavel Begunkov fl6->fl6_sport = inet->inet_sport; 1508db8dac20SDavid S. Miller 15096fc88c35SDave Marchevsky if (cgroup_bpf_enabled(CGROUP_UDP6_SENDMSG) && !connected) { 15101cedee13SAndrey Ignatov err = BPF_CGROUP_RUN_PROG_UDP6_SENDMSG_LOCK(sk, 15115298953eSPavel Begunkov (struct sockaddr *)sin6, 15125298953eSPavel Begunkov &fl6->saddr); 15131cedee13SAndrey Ignatov if (err) 15141cedee13SAndrey Ignatov goto out_no_dst; 15151cedee13SAndrey Ignatov if (sin6) { 15161cedee13SAndrey Ignatov if (ipv6_addr_v4mapped(&sin6->sin6_addr)) { 15171cedee13SAndrey Ignatov /* BPF program rewrote IPv6-only by IPv4-mapped 15181cedee13SAndrey Ignatov * IPv6. It's currently unsupported. 15191cedee13SAndrey Ignatov */ 15201cedee13SAndrey Ignatov err = -ENOTSUPP; 15211cedee13SAndrey Ignatov goto out_no_dst; 15221cedee13SAndrey Ignatov } 15231cedee13SAndrey Ignatov if (sin6->sin6_port == 0) { 15241cedee13SAndrey Ignatov /* BPF program set invalid port. Reject it. */ 15251cedee13SAndrey Ignatov err = -EINVAL; 15261cedee13SAndrey Ignatov goto out_no_dst; 15271cedee13SAndrey Ignatov } 15285298953eSPavel Begunkov fl6->fl6_dport = sin6->sin6_port; 15295298953eSPavel Begunkov fl6->daddr = sin6->sin6_addr; 15301cedee13SAndrey Ignatov } 15311cedee13SAndrey Ignatov } 15321cedee13SAndrey Ignatov 15335298953eSPavel Begunkov if (ipv6_addr_any(&fl6->daddr)) 15345298953eSPavel Begunkov fl6->daddr.s6_addr[15] = 0x1; /* :: means loopback (BSD'ism) */ 1535e8e36984SAndrey Ignatov 15365298953eSPavel Begunkov final_p = fl6_update_dst(fl6, opt, &final); 153720c59de2SArnaud Ebalard if (final_p) 15389f542f61SAlexey Kodanev connected = false; 1539db8dac20SDavid S. Miller 15405298953eSPavel Begunkov if (!fl6->flowi6_oif && ipv6_addr_is_multicast(&fl6->daddr)) { 15415298953eSPavel Begunkov fl6->flowi6_oif = np->mcast_oif; 15429f542f61SAlexey Kodanev connected = false; 15435298953eSPavel Begunkov } else if (!fl6->flowi6_oif) 15445298953eSPavel Begunkov fl6->flowi6_oif = np->ucast_oif; 1545db8dac20SDavid S. Miller 15465298953eSPavel Begunkov security_sk_classify_flow(sk, flowi6_to_flowi_common(fl6)); 1547db8dac20SDavid S. Miller 154838b7097bSHannes Frederic Sowa if (ipc6.tclass < 0) 154938b7097bSHannes Frederic Sowa ipc6.tclass = np->tclass; 155038b7097bSHannes Frederic Sowa 15515298953eSPavel Begunkov fl6->flowlabel = ip6_make_flowinfo(ipc6.tclass, fl6->flowlabel); 155238b7097bSHannes Frederic Sowa 15535298953eSPavel Begunkov dst = ip6_sk_dst_lookup_flow(sk, fl6, final_p, connected); 155468d0c6d3SDavid S. Miller if (IS_ERR(dst)) { 155568d0c6d3SDavid S. Miller err = PTR_ERR(dst); 155668d0c6d3SDavid S. Miller dst = NULL; 1557db8dac20SDavid S. Miller goto out; 1558db8dac20SDavid S. Miller } 1559db8dac20SDavid S. Miller 156026879da5SWei Wang if (ipc6.hlimit < 0) 15615298953eSPavel Begunkov ipc6.hlimit = ip6_sk_dst_hoplimit(np, fl6, dst); 1562db8dac20SDavid S. Miller 1563db8dac20SDavid S. Miller if (msg->msg_flags&MSG_CONFIRM) 1564db8dac20SDavid S. Miller goto do_confirm; 1565db8dac20SDavid S. Miller back_from_confirm: 1566db8dac20SDavid S. Miller 156703485f2aSVlad Yasevich /* Lockless fast path for the non-corking case */ 156803485f2aSVlad Yasevich if (!corkreq) { 156903485f2aSVlad Yasevich struct sk_buff *skb; 157003485f2aSVlad Yasevich 157103485f2aSVlad Yasevich skb = ip6_make_skb(sk, getfrag, msg, ulen, 157226879da5SWei Wang sizeof(struct udphdr), &ipc6, 1573f37a4cc6SPavel Begunkov (struct rt6_info *)dst, 15745fdaa88dSWillem de Bruijn msg->msg_flags, &cork); 157503485f2aSVlad Yasevich err = PTR_ERR(skb); 157603485f2aSVlad Yasevich if (!IS_ERR_OR_NULL(skb)) 15775298953eSPavel Begunkov err = udp_v6_send_skb(skb, fl6, &cork.base); 157840ac240cSPavel Begunkov /* ip6_make_skb steals dst reference */ 157940ac240cSPavel Begunkov goto out_no_dst; 158003485f2aSVlad Yasevich } 158103485f2aSVlad Yasevich 1582db8dac20SDavid S. Miller lock_sock(sk); 1583db8dac20SDavid S. Miller if (unlikely(up->pending)) { 1584db8dac20SDavid S. Miller /* The socket is already corked while preparing it. */ 1585db8dac20SDavid S. Miller /* ... which is an evident application bug. --ANK */ 1586db8dac20SDavid S. Miller release_sock(sk); 1587db8dac20SDavid S. Miller 1588ba7a46f1SJoe Perches net_dbg_ratelimited("udp cork app bug 2\n"); 1589db8dac20SDavid S. Miller err = -EINVAL; 1590db8dac20SDavid S. Miller goto out; 1591db8dac20SDavid S. Miller } 1592db8dac20SDavid S. Miller 1593db8dac20SDavid S. Miller up->pending = AF_INET6; 1594db8dac20SDavid S. Miller 1595db8dac20SDavid S. Miller do_append_data: 159626879da5SWei Wang if (ipc6.dontfrag < 0) 159726879da5SWei Wang ipc6.dontfrag = np->dontfrag; 1598db8dac20SDavid S. Miller up->len += ulen; 159926879da5SWei Wang err = ip6_append_data(sk, getfrag, msg, ulen, sizeof(struct udphdr), 16005298953eSPavel Begunkov &ipc6, fl6, (struct rt6_info *)dst, 16015fdaa88dSWillem de Bruijn corkreq ? msg->msg_flags|MSG_MORE : msg->msg_flags); 1602db8dac20SDavid S. Miller if (err) 1603db8dac20SDavid S. Miller udp_v6_flush_pending_frames(sk); 1604db8dac20SDavid S. Miller else if (!corkreq) 1605db8dac20SDavid S. Miller err = udp_v6_push_pending_frames(sk); 1606db8dac20SDavid S. Miller else if (unlikely(skb_queue_empty(&sk->sk_write_queue))) 1607db8dac20SDavid S. Miller up->pending = 0; 1608db8dac20SDavid S. Miller 160903485f2aSVlad Yasevich if (err > 0) 161003485f2aSVlad Yasevich err = np->recverr ? net_xmit_errno(err) : 0; 161103485f2aSVlad Yasevich release_sock(sk); 161203485f2aSVlad Yasevich 1613db8dac20SDavid S. Miller out: 1614a3c96089SYOSHIFUJI Hideaki dst_release(dst); 16151cedee13SAndrey Ignatov out_no_dst: 1616db8dac20SDavid S. Miller fl6_sock_release(flowlabel); 161745f6fad8SEric Dumazet txopt_put(opt_to_free); 1618db8dac20SDavid S. Miller if (!err) 1619db8dac20SDavid S. Miller return len; 1620db8dac20SDavid S. Miller /* 1621db8dac20SDavid S. Miller * ENOBUFS = no kernel mem, SOCK_NOSPACE = no sndbuf space. Reporting 1622db8dac20SDavid S. Miller * ENOBUFS might not be good (it's not tunable per se), but otherwise 1623db8dac20SDavid S. Miller * we don't have a good statistic (IpOutDiscards but it can be too many 1624db8dac20SDavid S. Miller * things). We could add another new stat but at least for now that 1625db8dac20SDavid S. Miller * seems like overkill. 1626db8dac20SDavid S. Miller */ 1627db8dac20SDavid S. Miller if (err == -ENOBUFS || test_bit(SOCK_NOSPACE, &sk->sk_socket->flags)) { 16286aef70a8SEric Dumazet UDP6_INC_STATS(sock_net(sk), 1629235b9f7aSPavel Emelyanov UDP_MIB_SNDBUFERRORS, is_udplite); 1630db8dac20SDavid S. Miller } 1631db8dac20SDavid S. Miller return err; 1632db8dac20SDavid S. Miller 1633db8dac20SDavid S. Miller do_confirm: 16340dec879fSJulian Anastasov if (msg->msg_flags & MSG_PROBE) 16355298953eSPavel Begunkov dst_confirm_neigh(dst, &fl6->daddr); 1636db8dac20SDavid S. Miller if (!(msg->msg_flags&MSG_PROBE) || len) 1637db8dac20SDavid S. Miller goto back_from_confirm; 1638db8dac20SDavid S. Miller err = 0; 1639db8dac20SDavid S. Miller goto out; 1640db8dac20SDavid S. Miller } 1641db8dac20SDavid S. Miller 16427d06b2e0SBrian Haley void udpv6_destroy_sock(struct sock *sk) 1643db8dac20SDavid S. Miller { 164444046a59STom Parkin struct udp_sock *up = udp_sk(sk); 1645db8dac20SDavid S. Miller lock_sock(sk); 1646a8b897c7SPaolo Abeni 1647a8b897c7SPaolo Abeni /* protects from races with udp_abort() */ 1648a8b897c7SPaolo Abeni sock_set_flag(sk, SOCK_DEAD); 1649db8dac20SDavid S. Miller udp_v6_flush_pending_frames(sk); 1650db8dac20SDavid S. Miller release_sock(sk); 1651db8dac20SDavid S. Miller 165260fb9567SPaolo Abeni if (static_branch_unlikely(&udpv6_encap_needed_key)) { 165360fb9567SPaolo Abeni if (up->encap_type) { 165444046a59STom Parkin void (*encap_destroy)(struct sock *sk); 16556aa7de05SMark Rutland encap_destroy = READ_ONCE(up->encap_destroy); 165644046a59STom Parkin if (encap_destroy) 165744046a59STom Parkin encap_destroy(sk); 165844046a59STom Parkin } 1659a4a600ddSXin Long if (up->encap_enabled) { 16609c480601SPaolo Abeni static_branch_dec(&udpv6_encap_needed_key); 1661a4a600ddSXin Long udp_encap_disable(); 1662a4a600ddSXin Long } 166360fb9567SPaolo Abeni } 166444046a59STom Parkin 1665db8dac20SDavid S. Miller inet6_destroy_sock(sk); 1666db8dac20SDavid S. Miller } 1667db8dac20SDavid S. Miller 1668db8dac20SDavid S. Miller /* 1669db8dac20SDavid S. Miller * Socket option code for UDP 1670db8dac20SDavid S. Miller */ 1671a7b75c5aSChristoph Hellwig int udpv6_setsockopt(struct sock *sk, int level, int optname, sockptr_t optval, 1672a7b75c5aSChristoph Hellwig unsigned int optlen) 1673db8dac20SDavid S. Miller { 1674db8dac20SDavid S. Miller if (level == SOL_UDP || level == SOL_UDPLITE) 167591ac1ccaSChristoph Hellwig return udp_lib_setsockopt(sk, level, optname, 1676a7b75c5aSChristoph Hellwig optval, optlen, 1677db8dac20SDavid S. Miller udp_v6_push_pending_frames); 1678db8dac20SDavid S. Miller return ipv6_setsockopt(sk, level, optname, optval, optlen); 1679db8dac20SDavid S. Miller } 1680db8dac20SDavid S. Miller 1681db8dac20SDavid S. Miller int udpv6_getsockopt(struct sock *sk, int level, int optname, 1682db8dac20SDavid S. Miller char __user *optval, int __user *optlen) 1683db8dac20SDavid S. Miller { 1684db8dac20SDavid S. Miller if (level == SOL_UDP || level == SOL_UDPLITE) 1685db8dac20SDavid S. Miller return udp_lib_getsockopt(sk, level, optname, optval, optlen); 1686db8dac20SDavid S. Miller return ipv6_getsockopt(sk, level, optname, optval, optlen); 1687db8dac20SDavid S. Miller } 1688db8dac20SDavid S. Miller 168911052589SKuniyuki Iwashima static const struct inet6_protocol udpv6_protocol = { 1690db8dac20SDavid S. Miller .handler = udpv6_rcv, 1691db8dac20SDavid S. Miller .err_handler = udpv6_err, 1692db8dac20SDavid S. Miller .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL, 1693db8dac20SDavid S. Miller }; 1694db8dac20SDavid S. Miller 1695db8dac20SDavid S. Miller /* ------------------------------------------------------------------------ */ 1696db8dac20SDavid S. Miller #ifdef CONFIG_PROC_FS 1697db8dac20SDavid S. Miller int udp6_seq_show(struct seq_file *seq, void *v) 1698db8dac20SDavid S. Miller { 169917ef66afSLorenzo Colitti if (v == SEQ_START_TOKEN) { 170017ef66afSLorenzo Colitti seq_puts(seq, IPV6_SEQ_DGRAM_HEADER); 170117ef66afSLorenzo Colitti } else { 170217ef66afSLorenzo Colitti int bucket = ((struct udp_iter_state *)seq->private)->bucket; 170317ef66afSLorenzo Colitti struct inet_sock *inet = inet_sk(v); 170417ef66afSLorenzo Colitti __u16 srcp = ntohs(inet->inet_sport); 170517ef66afSLorenzo Colitti __u16 destp = ntohs(inet->inet_dport); 17066c206b20SPaolo Abeni __ip6_dgram_sock_seq_show(seq, v, srcp, destp, 17076c206b20SPaolo Abeni udp_rqueue_get(v), bucket); 170817ef66afSLorenzo Colitti } 1709db8dac20SDavid S. Miller return 0; 1710db8dac20SDavid S. Miller } 1711db8dac20SDavid S. Miller 1712c3506372SChristoph Hellwig const struct seq_operations udp6_seq_ops = { 1713a3d2599bSChristoph Hellwig .start = udp_seq_start, 1714a3d2599bSChristoph Hellwig .next = udp_seq_next, 1715a3d2599bSChristoph Hellwig .stop = udp_seq_stop, 1716a3d2599bSChristoph Hellwig .show = udp6_seq_show, 1717a3d2599bSChristoph Hellwig }; 1718c3506372SChristoph Hellwig EXPORT_SYMBOL(udp6_seq_ops); 171973cb88ecSArjan van de Ven 1720db8dac20SDavid S. Miller static struct udp_seq_afinfo udp6_seq_afinfo = { 1721db8dac20SDavid S. Miller .family = AF_INET6, 1722645ca708SEric Dumazet .udp_table = &udp_table, 1723db8dac20SDavid S. Miller }; 1724db8dac20SDavid S. Miller 17252c8c1e72SAlexey Dobriyan int __net_init udp6_proc_init(struct net *net) 1726db8dac20SDavid S. Miller { 1727c3506372SChristoph Hellwig if (!proc_create_net_data("udp6", 0444, net->proc_net, &udp6_seq_ops, 1728c3506372SChristoph Hellwig sizeof(struct udp_iter_state), &udp6_seq_afinfo)) 1729a3d2599bSChristoph Hellwig return -ENOMEM; 1730a3d2599bSChristoph Hellwig return 0; 1731db8dac20SDavid S. Miller } 1732db8dac20SDavid S. Miller 1733ec120da6SIan Morris void udp6_proc_exit(struct net *net) 1734ec120da6SIan Morris { 1735a3d2599bSChristoph Hellwig remove_proc_entry("udp6", net->proc_net); 1736db8dac20SDavid S. Miller } 1737db8dac20SDavid S. Miller #endif /* CONFIG_PROC_FS */ 1738db8dac20SDavid S. Miller 1739db8dac20SDavid S. Miller /* ------------------------------------------------------------------------ */ 1740db8dac20SDavid S. Miller 1741db8dac20SDavid S. Miller struct proto udpv6_prot = { 1742db8dac20SDavid S. Miller .name = "UDPv6", 1743db8dac20SDavid S. Miller .owner = THIS_MODULE, 1744db8dac20SDavid S. Miller .close = udp_lib_close, 1745d74bad4eSAndrey Ignatov .pre_connect = udpv6_pre_connect, 1746db8dac20SDavid S. Miller .connect = ip6_datagram_connect, 1747db8dac20SDavid S. Miller .disconnect = udp_disconnect, 1748db8dac20SDavid S. Miller .ioctl = udp_ioctl, 1749*d38afeecSKuniyuki Iwashima .init = udpv6_init_sock, 1750db8dac20SDavid S. Miller .destroy = udpv6_destroy_sock, 1751db8dac20SDavid S. Miller .setsockopt = udpv6_setsockopt, 1752db8dac20SDavid S. Miller .getsockopt = udpv6_getsockopt, 1753db8dac20SDavid S. Miller .sendmsg = udpv6_sendmsg, 1754db8dac20SDavid S. Miller .recvmsg = udpv6_recvmsg, 1755e646b657SMartin KaFai Lau .release_cb = ip6_datagram_release_cb, 1756db8dac20SDavid S. Miller .hash = udp_lib_hash, 1757db8dac20SDavid S. Miller .unhash = udp_lib_unhash, 1758719f8358SEric Dumazet .rehash = udp_v6_rehash, 1759db8dac20SDavid S. Miller .get_port = udp_v6_get_port, 176091a760b2SMenglong Dong .put_port = udp_lib_unhash, 17618a59f9d1SCong Wang #ifdef CONFIG_BPF_SYSCALL 17628a59f9d1SCong Wang .psock_update_sk_prot = udp_bpf_update_proto, 17638a59f9d1SCong Wang #endif 17640defbb0aSEric Dumazet 1765db8dac20SDavid S. Miller .memory_allocated = &udp_memory_allocated, 17660defbb0aSEric Dumazet .per_cpu_fw_alloc = &udp_memory_per_cpu_fw_alloc, 17670defbb0aSEric Dumazet 1768db8dac20SDavid S. Miller .sysctl_mem = sysctl_udp_mem, 17691e802951STonghao Zhang .sysctl_wmem_offset = offsetof(struct net, ipv4.sysctl_udp_wmem_min), 17701e802951STonghao Zhang .sysctl_rmem_offset = offsetof(struct net, ipv4.sysctl_udp_rmem_min), 1771db8dac20SDavid S. Miller .obj_size = sizeof(struct udp6_sock), 1772645ca708SEric Dumazet .h.udp_table = &udp_table, 17735d77dca8SDavid Ahern .diag_destroy = udp_abort, 1774db8dac20SDavid S. Miller }; 1775db8dac20SDavid S. Miller 1776db8dac20SDavid S. Miller static struct inet_protosw udpv6_protosw = { 1777db8dac20SDavid S. Miller .type = SOCK_DGRAM, 1778db8dac20SDavid S. Miller .protocol = IPPROTO_UDP, 1779db8dac20SDavid S. Miller .prot = &udpv6_prot, 1780db8dac20SDavid S. Miller .ops = &inet6_dgram_ops, 1781db8dac20SDavid S. Miller .flags = INET_PROTOSW_PERMANENT, 1782db8dac20SDavid S. Miller }; 1783db8dac20SDavid S. Miller 1784db8dac20SDavid S. Miller int __init udpv6_init(void) 1785db8dac20SDavid S. Miller { 1786db8dac20SDavid S. Miller int ret; 1787db8dac20SDavid S. Miller 17883336288aSVlad Yasevich ret = inet6_add_protocol(&udpv6_protocol, IPPROTO_UDP); 17893336288aSVlad Yasevich if (ret) 1790c6b641a4SVlad Yasevich goto out; 17913336288aSVlad Yasevich 1792db8dac20SDavid S. Miller ret = inet6_register_protosw(&udpv6_protosw); 1793db8dac20SDavid S. Miller if (ret) 1794db8dac20SDavid S. Miller goto out_udpv6_protocol; 1795db8dac20SDavid S. Miller out: 1796db8dac20SDavid S. Miller return ret; 1797db8dac20SDavid S. Miller 1798db8dac20SDavid S. Miller out_udpv6_protocol: 1799db8dac20SDavid S. Miller inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP); 1800db8dac20SDavid S. Miller goto out; 1801db8dac20SDavid S. Miller } 1802db8dac20SDavid S. Miller 1803db8dac20SDavid S. Miller void udpv6_exit(void) 1804db8dac20SDavid S. Miller { 1805db8dac20SDavid S. Miller inet6_unregister_protosw(&udpv6_protosw); 1806db8dac20SDavid S. Miller inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP); 1807db8dac20SDavid S. Miller } 1808