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> 48*8139dccdSIvan Babrou #include <trace/events/udp.h> 49db8dac20SDavid S. Miller #include <net/xfrm.h> 500bd84065Ssubashab@codeaurora.org #include <net/inet_hashtables.h> 5172289b96STom Herbert #include <net/inet6_hashtables.h> 52076bb0c8SEliezer Tamir #include <net/busy_poll.h> 53e32ea7e7SCraig Gallek #include <net/sock_reuseport.h> 54db8dac20SDavid S. Miller 55db8dac20SDavid S. Miller #include <linux/proc_fs.h> 56db8dac20SDavid S. Miller #include <linux/seq_file.h> 5722911fc5SEric Dumazet #include <trace/events/skb.h> 58db8dac20SDavid S. Miller #include "udp_impl.h" 59db8dac20SDavid S. Miller 60d38afeecSKuniyuki Iwashima static void udpv6_destruct_sock(struct sock *sk) 61d38afeecSKuniyuki Iwashima { 62d38afeecSKuniyuki Iwashima udp_destruct_common(sk); 63d38afeecSKuniyuki Iwashima inet6_sock_destruct(sk); 64d38afeecSKuniyuki Iwashima } 65d38afeecSKuniyuki Iwashima 66d38afeecSKuniyuki Iwashima int udpv6_init_sock(struct sock *sk) 67d38afeecSKuniyuki Iwashima { 688a3854c7SPaolo Abeni udp_lib_init_sock(sk); 69d38afeecSKuniyuki Iwashima sk->sk_destruct = udpv6_destruct_sock; 708f279fb0SPavel Begunkov set_bit(SOCK_SUPPORT_ZC, &sk->sk_socket->flags); 71d38afeecSKuniyuki Iwashima return 0; 72d38afeecSKuniyuki Iwashima } 73d38afeecSKuniyuki Iwashima 746eada011SEric Dumazet static u32 udp6_ehashfn(const struct net *net, 75b50026b5SHannes Frederic Sowa const struct in6_addr *laddr, 76b50026b5SHannes Frederic Sowa const u16 lport, 77b50026b5SHannes Frederic Sowa const struct in6_addr *faddr, 78b50026b5SHannes Frederic Sowa const __be16 fport) 79b50026b5SHannes Frederic Sowa { 801bbdceefSHannes Frederic Sowa static u32 udp6_ehash_secret __read_mostly; 811bbdceefSHannes Frederic Sowa static u32 udp_ipv6_hash_secret __read_mostly; 821bbdceefSHannes Frederic Sowa 831bbdceefSHannes Frederic Sowa u32 lhash, fhash; 841bbdceefSHannes Frederic Sowa 851bbdceefSHannes Frederic Sowa net_get_random_once(&udp6_ehash_secret, 861bbdceefSHannes Frederic Sowa sizeof(udp6_ehash_secret)); 871bbdceefSHannes Frederic Sowa net_get_random_once(&udp_ipv6_hash_secret, 881bbdceefSHannes Frederic Sowa sizeof(udp_ipv6_hash_secret)); 891bbdceefSHannes Frederic Sowa 901bbdceefSHannes Frederic Sowa lhash = (__force u32)laddr->s6_addr32[3]; 911bbdceefSHannes Frederic Sowa fhash = __ipv6_addr_jhash(faddr, udp_ipv6_hash_secret); 921bbdceefSHannes Frederic Sowa 93b50026b5SHannes Frederic Sowa return __inet6_ehashfn(lhash, lport, fhash, fport, 941bbdceefSHannes Frederic Sowa udp_ipv6_hash_secret + net_hash_mix(net)); 95b50026b5SHannes Frederic Sowa } 96b50026b5SHannes Frederic Sowa 976ba5a3c5SPavel Emelyanov int udp_v6_get_port(struct sock *sk, unsigned short snum) 98db8dac20SDavid S. Miller { 9930fff923SEric Dumazet unsigned int hash2_nulladdr = 100f0b1e64cSMartin KaFai Lau ipv6_portaddr_hash(sock_net(sk), &in6addr_any, snum); 10130fff923SEric Dumazet unsigned int hash2_partial = 102f0b1e64cSMartin KaFai Lau ipv6_portaddr_hash(sock_net(sk), &sk->sk_v6_rcv_saddr, 0); 10330fff923SEric Dumazet 104d4cada4aSEric Dumazet /* precompute partial secondary hash */ 10530fff923SEric Dumazet udp_sk(sk)->udp_portaddr_hash = hash2_partial; 106fe38d2a1SJosef Bacik return udp_lib_get_port(sk, snum, hash2_nulladdr); 107db8dac20SDavid S. Miller } 108db8dac20SDavid S. Miller 109f7c46156SAlexey Kodanev void udp_v6_rehash(struct sock *sk) 110719f8358SEric Dumazet { 111f0b1e64cSMartin KaFai Lau u16 new_hash = ipv6_portaddr_hash(sock_net(sk), 112efe4208fSEric Dumazet &sk->sk_v6_rcv_saddr, 113719f8358SEric Dumazet inet_sk(sk)->inet_num); 114719f8358SEric Dumazet 115719f8358SEric Dumazet udp_lib_rehash(sk, new_hash); 116719f8358SEric Dumazet } 117719f8358SEric Dumazet 118d1e37288SSu, Xuemin static int compute_score(struct sock *sk, struct net *net, 11988440ae7SBalazs Scheidler const struct in6_addr *saddr, __be16 sport, 120d1e37288SSu, Xuemin const struct in6_addr *daddr, unsigned short hnum, 12173545373STim Beale int dif, int sdif) 122db8dac20SDavid S. Miller { 1234c971d2fSEric Dumazet int bound_dev_if, score; 12460c04aecSJoe Perches struct inet_sock *inet; 1256da5b0f0SMike Manning bool dev_match; 126db8dac20SDavid S. Miller 12760c04aecSJoe Perches if (!net_eq(sock_net(sk), net) || 12860c04aecSJoe Perches udp_sk(sk)->udp_port_hash != hnum || 12960c04aecSJoe Perches sk->sk_family != PF_INET6) 13060c04aecSJoe Perches return -1; 131645ca708SEric Dumazet 13223b0269eSPeter Oskolkov if (!ipv6_addr_equal(&sk->sk_v6_rcv_saddr, daddr)) 13323b0269eSPeter Oskolkov return -1; 13423b0269eSPeter Oskolkov 135645ca708SEric Dumazet score = 0; 13660c04aecSJoe Perches inet = inet_sk(sk); 13760c04aecSJoe Perches 138c720c7e8SEric Dumazet if (inet->inet_dport) { 139c720c7e8SEric Dumazet if (inet->inet_dport != sport) 140645ca708SEric Dumazet return -1; 141db8dac20SDavid S. Miller score++; 142db8dac20SDavid S. Miller } 14360c04aecSJoe Perches 144efe4208fSEric Dumazet if (!ipv6_addr_any(&sk->sk_v6_daddr)) { 145efe4208fSEric Dumazet if (!ipv6_addr_equal(&sk->sk_v6_daddr, saddr)) 146645ca708SEric Dumazet return -1; 147db8dac20SDavid S. Miller score++; 148db8dac20SDavid S. Miller } 14960c04aecSJoe Perches 1504c971d2fSEric Dumazet bound_dev_if = READ_ONCE(sk->sk_bound_dev_if); 1514c971d2fSEric Dumazet dev_match = udp_sk_bound_dev_eq(net, bound_dev_if, dif, sdif); 15269678bcdSPaolo Abeni if (!dev_match) 153645ca708SEric Dumazet return -1; 1544c971d2fSEric Dumazet if (bound_dev_if) 155db8dac20SDavid S. Miller score++; 15660c04aecSJoe Perches 1577170a977SEric Dumazet if (READ_ONCE(sk->sk_incoming_cpu) == raw_smp_processor_id()) 15870da268bSEric Dumazet score++; 15970da268bSEric Dumazet 160645ca708SEric Dumazet return score; 161645ca708SEric Dumazet } 162645ca708SEric Dumazet 163a57066b1SDavid S. Miller static struct sock *lookup_reuseport(struct net *net, struct sock *sk, 1642a08748cSJakub Sitnicki struct sk_buff *skb, 1652a08748cSJakub Sitnicki const struct in6_addr *saddr, 1662a08748cSJakub Sitnicki __be16 sport, 1672a08748cSJakub Sitnicki const struct in6_addr *daddr, 1682a08748cSJakub Sitnicki unsigned int hnum) 1692a08748cSJakub Sitnicki { 1702a08748cSJakub Sitnicki struct sock *reuse_sk = NULL; 1712a08748cSJakub Sitnicki u32 hash; 1722a08748cSJakub Sitnicki 1732a08748cSJakub Sitnicki if (sk->sk_reuseport && sk->sk_state != TCP_ESTABLISHED) { 1742a08748cSJakub Sitnicki hash = udp6_ehashfn(net, daddr, hnum, saddr, sport); 1752a08748cSJakub Sitnicki reuse_sk = reuseport_select_sock(sk, hash, skb, 1762a08748cSJakub Sitnicki sizeof(struct udphdr)); 1772a08748cSJakub Sitnicki } 1782a08748cSJakub Sitnicki return reuse_sk; 1792a08748cSJakub Sitnicki } 1802a08748cSJakub Sitnicki 181d1e37288SSu, Xuemin /* called with rcu_read_lock() */ 182fddc17deSEric Dumazet static struct sock *udp6_lib_lookup2(struct net *net, 183fddc17deSEric Dumazet const struct in6_addr *saddr, __be16 sport, 1841801b570SDavid Ahern const struct in6_addr *daddr, unsigned int hnum, 18573545373STim Beale int dif, int sdif, struct udp_hslot *hslot2, 18673545373STim Beale struct sk_buff *skb) 187fddc17deSEric Dumazet { 188fddc17deSEric Dumazet struct sock *sk, *result; 189e94a62f5SPaolo Abeni int score, badness; 190fddc17deSEric Dumazet 191fddc17deSEric Dumazet result = NULL; 192fddc17deSEric Dumazet badness = -1; 193ca065d0cSEric Dumazet udp_portaddr_for_each_entry_rcu(sk, &hslot2->head) { 194d1e37288SSu, Xuemin score = compute_score(sk, net, saddr, sport, 19573545373STim Beale daddr, hnum, dif, sdif); 196fddc17deSEric Dumazet if (score > badness) { 1972a08748cSJakub Sitnicki result = lookup_reuseport(net, sk, skb, 1982a08748cSJakub Sitnicki saddr, sport, daddr, hnum); 199a57066b1SDavid S. Miller /* Fall back to scoring if group has connections */ 20069421bf9SKuniyuki Iwashima if (result && !reuseport_has_conns(sk)) 201ca065d0cSEric Dumazet return result; 2022a08748cSJakub Sitnicki 203a57066b1SDavid S. Miller result = result ? : sk; 204ca065d0cSEric Dumazet badness = score; 205fddc17deSEric Dumazet } 206fddc17deSEric Dumazet } 207fddc17deSEric Dumazet return result; 208fddc17deSEric Dumazet } 209fddc17deSEric Dumazet 2106d4201b1SJakub Sitnicki static inline struct sock *udp6_lookup_run_bpf(struct net *net, 2116d4201b1SJakub Sitnicki struct udp_table *udptable, 2126d4201b1SJakub Sitnicki struct sk_buff *skb, 2136d4201b1SJakub Sitnicki const struct in6_addr *saddr, 2146d4201b1SJakub Sitnicki __be16 sport, 2156d4201b1SJakub Sitnicki const struct in6_addr *daddr, 216f8931565SMark Pashmfouroush u16 hnum, const int dif) 2176d4201b1SJakub Sitnicki { 2186d4201b1SJakub Sitnicki struct sock *sk, *reuse_sk; 2196d4201b1SJakub Sitnicki bool no_reuseport; 2206d4201b1SJakub Sitnicki 221ba6aac15SKuniyuki Iwashima if (udptable != net->ipv4.udp_table) 2226d4201b1SJakub Sitnicki return NULL; /* only UDP is supported */ 2236d4201b1SJakub Sitnicki 224f8931565SMark Pashmfouroush no_reuseport = bpf_sk_lookup_run_v6(net, IPPROTO_UDP, saddr, sport, 225f8931565SMark Pashmfouroush daddr, hnum, dif, &sk); 2266d4201b1SJakub Sitnicki if (no_reuseport || IS_ERR_OR_NULL(sk)) 2276d4201b1SJakub Sitnicki return sk; 2286d4201b1SJakub Sitnicki 2296d4201b1SJakub Sitnicki reuse_sk = lookup_reuseport(net, sk, skb, saddr, sport, daddr, hnum); 230c64c9c28SJakub Sitnicki if (reuse_sk) 2316d4201b1SJakub Sitnicki sk = reuse_sk; 2326d4201b1SJakub Sitnicki return sk; 2336d4201b1SJakub Sitnicki } 2346d4201b1SJakub Sitnicki 235ca065d0cSEric Dumazet /* rcu_read_lock() must be held */ 236fce82338SPavel Emelyanov struct sock *__udp6_lib_lookup(struct net *net, 23788440ae7SBalazs Scheidler const struct in6_addr *saddr, __be16 sport, 23888440ae7SBalazs Scheidler const struct in6_addr *daddr, __be16 dport, 2391801b570SDavid Ahern int dif, int sdif, struct udp_table *udptable, 240538950a1SCraig Gallek struct sk_buff *skb) 241645ca708SEric Dumazet { 242645ca708SEric Dumazet unsigned short hnum = ntohs(dport); 24323b0269eSPeter Oskolkov unsigned int hash2, slot2; 24423b0269eSPeter Oskolkov struct udp_hslot *hslot2; 2456d4201b1SJakub Sitnicki struct sock *result, *sk; 246645ca708SEric Dumazet 247f0b1e64cSMartin KaFai Lau hash2 = ipv6_portaddr_hash(net, daddr, hnum); 248fddc17deSEric Dumazet slot2 = hash2 & udptable->mask; 249fddc17deSEric Dumazet hslot2 = &udptable->hash2[slot2]; 250fddc17deSEric Dumazet 2516d4201b1SJakub Sitnicki /* Lookup connected or non-wildcard sockets */ 252fddc17deSEric Dumazet result = udp6_lib_lookup2(net, saddr, sport, 25373545373STim Beale daddr, hnum, dif, sdif, 254d1e37288SSu, Xuemin hslot2, skb); 2556d4201b1SJakub Sitnicki if (!IS_ERR_OR_NULL(result) && result->sk_state == TCP_ESTABLISHED) 2566d4201b1SJakub Sitnicki goto done; 2576d4201b1SJakub Sitnicki 2586d4201b1SJakub Sitnicki /* Lookup redirect from BPF */ 2596d4201b1SJakub Sitnicki if (static_branch_unlikely(&bpf_sk_lookup_enabled)) { 2606d4201b1SJakub Sitnicki sk = udp6_lookup_run_bpf(net, udptable, skb, 261f8931565SMark Pashmfouroush saddr, sport, daddr, hnum, dif); 2626d4201b1SJakub Sitnicki if (sk) { 2636d4201b1SJakub Sitnicki result = sk; 2646d4201b1SJakub Sitnicki goto done; 2656d4201b1SJakub Sitnicki } 2666d4201b1SJakub Sitnicki } 2676d4201b1SJakub Sitnicki 2686d4201b1SJakub Sitnicki /* Got non-wildcard socket or error on first lookup */ 2696d4201b1SJakub Sitnicki if (result) 2706d4201b1SJakub Sitnicki goto done; 2716d4201b1SJakub Sitnicki 2726d4201b1SJakub Sitnicki /* Lookup wildcard sockets */ 273f0b1e64cSMartin KaFai Lau hash2 = ipv6_portaddr_hash(net, &in6addr_any, hnum); 274fddc17deSEric Dumazet slot2 = hash2 & udptable->mask; 275fddc17deSEric Dumazet hslot2 = &udptable->hash2[slot2]; 276fddc17deSEric Dumazet 2771223c67cSJorge Boncompte [DTI2] result = udp6_lib_lookup2(net, saddr, sport, 27823b0269eSPeter Oskolkov &in6addr_any, hnum, dif, sdif, 27973545373STim Beale hslot2, skb); 2806d4201b1SJakub Sitnicki done: 28126f8113cSEnrico Weigelt if (IS_ERR(result)) 2828217ca65SMartin KaFai Lau return NULL; 283fddc17deSEric Dumazet return result; 284fddc17deSEric Dumazet } 285fce82338SPavel Emelyanov EXPORT_SYMBOL_GPL(__udp6_lib_lookup); 286db8dac20SDavid S. Miller 287607c4aafSKOVACS Krisztian static struct sock *__udp6_lib_lookup_skb(struct sk_buff *skb, 288607c4aafSKOVACS Krisztian __be16 sport, __be16 dport, 289645ca708SEric Dumazet struct udp_table *udptable) 290607c4aafSKOVACS Krisztian { 291b71d1d42SEric Dumazet const struct ipv6hdr *iph = ipv6_hdr(skb); 292607c4aafSKOVACS Krisztian 293ed7cbbceSAlexander Duyck return __udp6_lib_lookup(dev_net(skb->dev), &iph->saddr, sport, 294607c4aafSKOVACS Krisztian &iph->daddr, dport, inet6_iif(skb), 2951801b570SDavid Ahern inet6_sdif(skb), udptable, skb); 296607c4aafSKOVACS Krisztian } 297607c4aafSKOVACS Krisztian 2987b58e63eSEric Dumazet struct sock *udp6_lib_lookup_skb(const struct sk_buff *skb, 29963058308STom Herbert __be16 sport, __be16 dport) 30063058308STom Herbert { 30163058308STom Herbert const struct ipv6hdr *iph = ipv6_hdr(skb); 302ba6aac15SKuniyuki Iwashima struct net *net = dev_net(skb->dev); 30363058308STom Herbert 304ba6aac15SKuniyuki Iwashima return __udp6_lib_lookup(net, &iph->saddr, sport, 30563058308STom Herbert &iph->daddr, dport, inet6_iif(skb), 306ba6aac15SKuniyuki Iwashima inet6_sdif(skb), net->ipv4.udp_table, NULL); 30763058308STom Herbert } 30863058308STom Herbert 309ca065d0cSEric Dumazet /* Must be called under rcu_read_lock(). 310ca065d0cSEric Dumazet * Does increment socket refcount. 311ca065d0cSEric Dumazet */ 3126e86000cSArnd Bergmann #if IS_ENABLED(CONFIG_NF_TPROXY_IPV6) || IS_ENABLED(CONFIG_NF_SOCKET_IPV6) 313aa976fc0SBalazs Scheidler struct sock *udp6_lib_lookup(struct net *net, const struct in6_addr *saddr, __be16 sport, 314aa976fc0SBalazs Scheidler const struct in6_addr *daddr, __be16 dport, int dif) 315aa976fc0SBalazs Scheidler { 316ca065d0cSEric Dumazet struct sock *sk; 317ca065d0cSEric Dumazet 318ca065d0cSEric Dumazet sk = __udp6_lib_lookup(net, saddr, sport, daddr, dport, 319ba6aac15SKuniyuki Iwashima dif, 0, net->ipv4.udp_table, NULL); 32041c6d650SReshetova, Elena if (sk && !refcount_inc_not_zero(&sk->sk_refcnt)) 321ca065d0cSEric Dumazet sk = NULL; 322ca065d0cSEric Dumazet return sk; 323aa976fc0SBalazs Scheidler } 324aa976fc0SBalazs Scheidler EXPORT_SYMBOL_GPL(udp6_lib_lookup); 325ca065d0cSEric Dumazet #endif 326aa976fc0SBalazs Scheidler 327cb891fa6SPaolo Abeni /* do not use the scratch area len for jumbogram: their length execeeds the 328cb891fa6SPaolo Abeni * scratch area space; note that the IP6CB flags is still in the first 329cb891fa6SPaolo Abeni * cacheline, so checking for jumbograms is cheap 330cb891fa6SPaolo Abeni */ 331cb891fa6SPaolo Abeni static int udp6_skb_len(struct sk_buff *skb) 332cb891fa6SPaolo Abeni { 333cb891fa6SPaolo Abeni return unlikely(inet6_is_jumbogram(skb)) ? skb->len : udp_skb_len(skb); 334cb891fa6SPaolo Abeni } 335cb891fa6SPaolo Abeni 336db8dac20SDavid S. Miller /* 337db8dac20SDavid S. Miller * This should be easy, if there is something there we 338db8dac20SDavid S. Miller * return it, otherwise we block. 339db8dac20SDavid S. Miller */ 340db8dac20SDavid S. Miller 3411b784140SYing Xue int udpv6_recvmsg(struct sock *sk, struct msghdr *msg, size_t len, 342ec095263SOliver Hartkopp int flags, int *addr_len) 343db8dac20SDavid S. Miller { 344db8dac20SDavid S. Miller struct ipv6_pinfo *np = inet6_sk(sk); 345db8dac20SDavid S. Miller struct inet_sock *inet = inet_sk(sk); 346db8dac20SDavid S. Miller struct sk_buff *skb; 34759c2cdaeSDavid S. Miller unsigned int ulen, copied; 348fd69c399SPaolo Abeni int off, err, peeking = flags & MSG_PEEK; 349db8dac20SDavid S. Miller int is_udplite = IS_UDPLITE(sk); 350543fc3fbSPaolo Abeni struct udp_mib __percpu *mib; 351197c949eSEric Dumazet bool checksum_valid = false; 352f26ba175SWei Yongjun int is_udp4; 353db8dac20SDavid S. Miller 354db8dac20SDavid S. Miller if (flags & MSG_ERRQUEUE) 35585fbaa75SHannes Frederic Sowa return ipv6_recv_error(sk, msg, len, addr_len); 356db8dac20SDavid S. Miller 3574b340ae2SBrian Haley if (np->rxpmtu && np->rxopt.bits.rxpmtu) 35885fbaa75SHannes Frederic Sowa return ipv6_recv_rxpmtu(sk, msg, len, addr_len); 3594b340ae2SBrian Haley 360db8dac20SDavid S. Miller try_again: 361a0917e0bSMatthew Dawson off = sk_peek_offset(sk, flags); 362ec095263SOliver Hartkopp skb = __skb_recv_udp(sk, flags, &off, &err); 363db8dac20SDavid S. Miller if (!skb) 364627d2d6bSsamanthakumar return err; 365db8dac20SDavid S. Miller 366cb891fa6SPaolo Abeni ulen = udp6_skb_len(skb); 36759c2cdaeSDavid S. Miller copied = len; 368627d2d6bSsamanthakumar if (copied > ulen - off) 369627d2d6bSsamanthakumar copied = ulen - off; 37059c2cdaeSDavid S. Miller else if (copied < ulen) 371db8dac20SDavid S. Miller msg->msg_flags |= MSG_TRUNC; 372db8dac20SDavid S. Miller 373f26ba175SWei Yongjun is_udp4 = (skb->protocol == htons(ETH_P_IP)); 374029a3743SPaolo Abeni mib = __UDPX_MIB(sk, is_udp4); 375f26ba175SWei Yongjun 376db8dac20SDavid S. Miller /* 377db8dac20SDavid S. Miller * If checksum is needed at all, try to do it while copying the 378db8dac20SDavid S. Miller * data. If the data is truncated, or if we only want a partial 379db8dac20SDavid S. Miller * coverage checksum (UDP-Lite), do it before the copy. 380db8dac20SDavid S. Miller */ 381db8dac20SDavid S. Miller 382d21dbdfeSEric Dumazet if (copied < ulen || peeking || 383d21dbdfeSEric Dumazet (is_udplite && UDP_SKB_CB(skb)->partial_cov)) { 38467a51780SPaolo Abeni checksum_valid = udp_skb_csum_unnecessary(skb) || 38567a51780SPaolo Abeni !__udp_lib_checksum_complete(skb); 386197c949eSEric Dumazet if (!checksum_valid) 387db8dac20SDavid S. Miller goto csum_copy_err; 388db8dac20SDavid S. Miller } 389db8dac20SDavid S. Miller 39067a51780SPaolo Abeni if (checksum_valid || udp_skb_csum_unnecessary(skb)) { 39167a51780SPaolo Abeni if (udp_skb_is_linear(skb)) 39267a51780SPaolo Abeni err = copy_linear_skb(skb, copied, off, &msg->msg_iter); 39367a51780SPaolo Abeni else 394627d2d6bSsamanthakumar err = skb_copy_datagram_msg(skb, off, msg, copied); 39567a51780SPaolo Abeni } else { 396627d2d6bSsamanthakumar err = skb_copy_and_csum_datagram_msg(skb, off, msg); 397db8dac20SDavid S. Miller if (err == -EINVAL) 398db8dac20SDavid S. Miller goto csum_copy_err; 399db8dac20SDavid S. Miller } 40022911fc5SEric Dumazet if (unlikely(err)) { 401fd69c399SPaolo Abeni if (!peeking) { 402979402b1SEric Dumazet atomic_inc(&sk->sk_drops); 403029a3743SPaolo Abeni SNMP_INC_STATS(mib, UDP_MIB_INERRORS); 404979402b1SEric Dumazet } 405850cbaddSPaolo Abeni kfree_skb(skb); 406627d2d6bSsamanthakumar return err; 40722911fc5SEric Dumazet } 408fd69c399SPaolo Abeni if (!peeking) 409029a3743SPaolo Abeni SNMP_INC_STATS(mib, UDP_MIB_INDATAGRAMS); 410db8dac20SDavid S. Miller 4116fd1d51cSErin MacNeil sock_recv_cmsgs(msg, sk, skb); 412db8dac20SDavid S. Miller 413db8dac20SDavid S. Miller /* Copy the address. */ 414db8dac20SDavid S. Miller if (msg->msg_name) { 415342dfc30SSteffen Hurrle DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, msg->msg_name); 416db8dac20SDavid S. Miller sin6->sin6_family = AF_INET6; 417db8dac20SDavid S. Miller sin6->sin6_port = udp_hdr(skb)->source; 418db8dac20SDavid S. Miller sin6->sin6_flowinfo = 0; 419db8dac20SDavid S. Miller 420842df073SHannes Frederic Sowa if (is_udp4) { 421b301e82cSBrian Haley ipv6_addr_set_v4mapped(ip_hdr(skb)->saddr, 422b301e82cSBrian Haley &sin6->sin6_addr); 423842df073SHannes Frederic Sowa sin6->sin6_scope_id = 0; 424842df073SHannes Frederic Sowa } else { 4254e3fd7a0SAlexey Dobriyan sin6->sin6_addr = ipv6_hdr(skb)->saddr; 426842df073SHannes Frederic Sowa sin6->sin6_scope_id = 427842df073SHannes Frederic Sowa ipv6_iface_scope_id(&sin6->sin6_addr, 4284330487aSDuan Jiong inet6_iif(skb)); 429db8dac20SDavid S. Miller } 430bceaa902SHannes Frederic Sowa *addr_len = sizeof(*sin6); 431983695faSDaniel Borkmann 432983695faSDaniel Borkmann BPF_CGROUP_RUN_PROG_UDP6_RECVMSG_LOCK(sk, 433983695faSDaniel Borkmann (struct sockaddr *)sin6); 434db8dac20SDavid S. Miller } 4354b261c75SHannes Frederic Sowa 436bcd1665eSPaolo Abeni if (udp_sk(sk)->gro_enabled) 437bcd1665eSPaolo Abeni udp_cmsg_recv(msg, sk, skb); 438bcd1665eSPaolo Abeni 4394b261c75SHannes Frederic Sowa if (np->rxopt.all) 4404b261c75SHannes Frederic Sowa ip6_datagram_recv_common_ctl(sk, msg, skb); 4414b261c75SHannes Frederic Sowa 442f26ba175SWei Yongjun if (is_udp4) { 443db8dac20SDavid S. Miller if (inet->cmsg_flags) 444ad959036SPaolo Abeni ip_cmsg_recv_offset(msg, sk, skb, 44510df8e61SEric Dumazet sizeof(struct udphdr), off); 446db8dac20SDavid S. Miller } else { 447db8dac20SDavid S. Miller if (np->rxopt.all) 4484b261c75SHannes Frederic Sowa ip6_datagram_recv_specific_ctl(sk, msg, skb); 449db8dac20SDavid S. Miller } 450db8dac20SDavid S. Miller 45159c2cdaeSDavid S. Miller err = copied; 452db8dac20SDavid S. Miller if (flags & MSG_TRUNC) 453db8dac20SDavid S. Miller err = ulen; 454db8dac20SDavid S. Miller 455850cbaddSPaolo Abeni skb_consume_udp(sk, skb, peeking ? -err : err); 456db8dac20SDavid S. Miller return err; 457db8dac20SDavid S. Miller 458db8dac20SDavid S. Miller csum_copy_err: 4592276f58aSPaolo Abeni if (!__sk_queue_drop_skb(sk, &udp_sk(sk)->reader_queue, skb, flags, 4602276f58aSPaolo Abeni udp_skb_destructor)) { 461029a3743SPaolo Abeni SNMP_INC_STATS(mib, UDP_MIB_CSUMERRORS); 462029a3743SPaolo Abeni SNMP_INC_STATS(mib, UDP_MIB_INERRORS); 4636a5dc9e5SEric Dumazet } 464850cbaddSPaolo Abeni kfree_skb(skb); 465db8dac20SDavid S. Miller 466beb39db5SEric Dumazet /* starting over for a new packet, but check if we need to yield */ 467beb39db5SEric Dumazet cond_resched(); 4689cfaa8deSXufeng Zhang msg->msg_flags &= ~MSG_TRUNC; 469db8dac20SDavid S. Miller goto try_again; 470db8dac20SDavid S. Miller } 471db8dac20SDavid S. Miller 472a36e185eSStefano Brivio DEFINE_STATIC_KEY_FALSE(udpv6_encap_needed_key); 473a36e185eSStefano Brivio void udpv6_encap_enable(void) 474a36e185eSStefano Brivio { 4759c480601SPaolo Abeni static_branch_inc(&udpv6_encap_needed_key); 476a36e185eSStefano Brivio } 477a36e185eSStefano Brivio EXPORT_SYMBOL(udpv6_encap_enable); 478a36e185eSStefano Brivio 479e7cc0824SStefano Brivio /* Handler for tunnels with arbitrary destination ports: no socket lookup, go 480e7cc0824SStefano Brivio * through error handlers in encapsulations looking for a match. 481e7cc0824SStefano Brivio */ 482e7cc0824SStefano Brivio static int __udp6_lib_err_encap_no_sk(struct sk_buff *skb, 483e7cc0824SStefano Brivio struct inet6_skb_parm *opt, 484424a7cd0SPaolo Abeni u8 type, u8 code, int offset, __be32 info) 485e7cc0824SStefano Brivio { 486e7cc0824SStefano Brivio int i; 487e7cc0824SStefano Brivio 488e7cc0824SStefano Brivio for (i = 0; i < MAX_IPTUN_ENCAP_OPS; i++) { 489e7cc0824SStefano Brivio int (*handler)(struct sk_buff *skb, struct inet6_skb_parm *opt, 490424a7cd0SPaolo Abeni u8 type, u8 code, int offset, __be32 info); 491424a7cd0SPaolo Abeni const struct ip6_tnl_encap_ops *encap; 492e7cc0824SStefano Brivio 493424a7cd0SPaolo Abeni encap = rcu_dereference(ip6tun_encaps[i]); 494424a7cd0SPaolo Abeni if (!encap) 495e7cc0824SStefano Brivio continue; 496424a7cd0SPaolo Abeni handler = encap->err_handler; 497e7cc0824SStefano Brivio if (handler && !handler(skb, opt, type, code, offset, info)) 498e7cc0824SStefano Brivio return 0; 499e7cc0824SStefano Brivio } 500e7cc0824SStefano Brivio 501e7cc0824SStefano Brivio return -ENOENT; 502e7cc0824SStefano Brivio } 503e7cc0824SStefano Brivio 504a36e185eSStefano Brivio /* Try to match ICMP errors to UDP tunnels by looking up a socket without 505a36e185eSStefano Brivio * reversing source and destination port: this will match tunnels that force the 506a36e185eSStefano Brivio * same destination port on both endpoints (e.g. VXLAN, GENEVE). Note that 507a36e185eSStefano Brivio * lwtunnels might actually break this assumption by being configured with 508a36e185eSStefano Brivio * different destination ports on endpoints, in this case we won't be able to 509a36e185eSStefano Brivio * trace ICMP messages back to them. 510a36e185eSStefano Brivio * 511e7cc0824SStefano Brivio * If this doesn't match any socket, probe tunnels with arbitrary destination 512e7cc0824SStefano Brivio * ports (e.g. FoU, GUE): there, the receiving socket is useless, as the port 513e7cc0824SStefano Brivio * we've sent packets to won't necessarily match the local destination port. 514e7cc0824SStefano Brivio * 515a36e185eSStefano Brivio * Then ask the tunnel implementation to match the error against a valid 516a36e185eSStefano Brivio * association. 517a36e185eSStefano Brivio * 518e7cc0824SStefano Brivio * Return an error if we can't find a match, the socket if we need further 519e7cc0824SStefano Brivio * processing, zero otherwise. 520a36e185eSStefano Brivio */ 521a36e185eSStefano Brivio static struct sock *__udp6_lib_err_encap(struct net *net, 522a36e185eSStefano Brivio const struct ipv6hdr *hdr, int offset, 523a36e185eSStefano Brivio struct udphdr *uh, 524a36e185eSStefano Brivio struct udp_table *udptable, 5259bfce73cSVadim Fedorenko struct sock *sk, 526e7cc0824SStefano Brivio struct sk_buff *skb, 527e7cc0824SStefano Brivio struct inet6_skb_parm *opt, 528e7cc0824SStefano Brivio u8 type, u8 code, __be32 info) 529a36e185eSStefano Brivio { 5309bfce73cSVadim Fedorenko int (*lookup)(struct sock *sk, struct sk_buff *skb); 531a36e185eSStefano Brivio int network_offset, transport_offset; 5329bfce73cSVadim Fedorenko struct udp_sock *up; 533a36e185eSStefano Brivio 534a36e185eSStefano Brivio network_offset = skb_network_offset(skb); 535a36e185eSStefano Brivio transport_offset = skb_transport_offset(skb); 536a36e185eSStefano Brivio 537a36e185eSStefano Brivio /* Network header needs to point to the outer IPv6 header inside ICMP */ 538a36e185eSStefano Brivio skb_reset_network_header(skb); 539a36e185eSStefano Brivio 540a36e185eSStefano Brivio /* Transport header needs to point to the UDP header */ 541a36e185eSStefano Brivio skb_set_transport_header(skb, offset); 542a36e185eSStefano Brivio 5439bfce73cSVadim Fedorenko if (sk) { 5449bfce73cSVadim Fedorenko up = udp_sk(sk); 5459bfce73cSVadim Fedorenko 5469bfce73cSVadim Fedorenko lookup = READ_ONCE(up->encap_err_lookup); 5479bfce73cSVadim Fedorenko if (lookup && lookup(sk, skb)) 5489bfce73cSVadim Fedorenko sk = NULL; 5499bfce73cSVadim Fedorenko 5509bfce73cSVadim Fedorenko goto out; 5519bfce73cSVadim Fedorenko } 5529bfce73cSVadim Fedorenko 553e7cc0824SStefano Brivio sk = __udp6_lib_lookup(net, &hdr->daddr, uh->source, 554e7cc0824SStefano Brivio &hdr->saddr, uh->dest, 555e7cc0824SStefano Brivio inet6_iif(skb), 0, udptable, skb); 556e7cc0824SStefano Brivio if (sk) { 5579bfce73cSVadim Fedorenko up = udp_sk(sk); 558e7cc0824SStefano Brivio 559a36e185eSStefano Brivio lookup = READ_ONCE(up->encap_err_lookup); 560a36e185eSStefano Brivio if (!lookup || lookup(sk, skb)) 561a36e185eSStefano Brivio sk = NULL; 562e7cc0824SStefano Brivio } 563e7cc0824SStefano Brivio 5649bfce73cSVadim Fedorenko out: 565e7cc0824SStefano Brivio if (!sk) { 566e7cc0824SStefano Brivio sk = ERR_PTR(__udp6_lib_err_encap_no_sk(skb, opt, type, code, 567e7cc0824SStefano Brivio offset, info)); 568e7cc0824SStefano Brivio } 569a36e185eSStefano Brivio 570a36e185eSStefano Brivio skb_set_transport_header(skb, transport_offset); 571a36e185eSStefano Brivio skb_set_network_header(skb, network_offset); 572e7cc0824SStefano Brivio 573a36e185eSStefano Brivio return sk; 574a36e185eSStefano Brivio } 575a36e185eSStefano Brivio 57632bbd879SStefano Brivio int __udp6_lib_err(struct sk_buff *skb, struct inet6_skb_parm *opt, 577d5fdd6baSBrian Haley u8 type, u8 code, int offset, __be32 info, 578645ca708SEric Dumazet struct udp_table *udptable) 579db8dac20SDavid S. Miller { 580db8dac20SDavid S. Miller struct ipv6_pinfo *np; 581b71d1d42SEric Dumazet const struct ipv6hdr *hdr = (const struct ipv6hdr *)skb->data; 582b71d1d42SEric Dumazet const struct in6_addr *saddr = &hdr->saddr; 583222a011eSAndrew Lunn const struct in6_addr *daddr = seg6_get_daddr(skb, opt) ? : &hdr->daddr; 584db8dac20SDavid S. Miller struct udphdr *uh = (struct udphdr *)(skb->data+offset); 585a36e185eSStefano Brivio bool tunnel = false; 586db8dac20SDavid S. Miller struct sock *sk; 587e0d8c1b7SWei Wang int harderr; 588db8dac20SDavid S. Miller int err; 5897304fe46SDuan Jiong struct net *net = dev_net(skb->dev); 590db8dac20SDavid S. Miller 591e32ea7e7SCraig Gallek sk = __udp6_lib_lookup(net, daddr, uh->dest, saddr, uh->source, 5924ac30c4bSMartin KaFai Lau inet6_iif(skb), inet6_sdif(skb), udptable, NULL); 5939bfce73cSVadim Fedorenko 594d26796aeSXin Long if (!sk || udp_sk(sk)->encap_type) { 595a36e185eSStefano Brivio /* No socket for error: try tunnels before discarding */ 596a36e185eSStefano Brivio if (static_branch_unlikely(&udpv6_encap_needed_key)) { 597a36e185eSStefano Brivio sk = __udp6_lib_err_encap(net, hdr, offset, uh, 5989bfce73cSVadim Fedorenko udptable, sk, skb, 599e7cc0824SStefano Brivio opt, type, code, info); 600e7cc0824SStefano Brivio if (!sk) 601e7cc0824SStefano Brivio return 0; 6029bfce73cSVadim Fedorenko } else 6039bfce73cSVadim Fedorenko sk = ERR_PTR(-ENOENT); 604a36e185eSStefano Brivio 605e7cc0824SStefano Brivio if (IS_ERR(sk)) { 606a16292a0SEric Dumazet __ICMP6_INC_STATS(net, __in6_dev_get(skb->dev), 6077304fe46SDuan Jiong ICMP6_MIB_INERRORS); 608e7cc0824SStefano Brivio return PTR_ERR(sk); 6097304fe46SDuan Jiong } 610e7cc0824SStefano Brivio 611a36e185eSStefano Brivio tunnel = true; 612a36e185eSStefano Brivio } 613db8dac20SDavid S. Miller 614e0d8c1b7SWei Wang harderr = icmpv6_err_convert(type, code, &err); 615e0d8c1b7SWei Wang np = inet6_sk(sk); 616e0d8c1b7SWei Wang 61793b36cf3SHannes Frederic Sowa if (type == ICMPV6_PKT_TOOBIG) { 61893b36cf3SHannes Frederic Sowa if (!ip6_sk_accept_pmtu(sk)) 61993b36cf3SHannes Frederic Sowa goto out; 62081aded24SDavid S. Miller ip6_sk_update_pmtu(skb, sk, info); 621e0d8c1b7SWei Wang if (np->pmtudisc != IPV6_PMTUDISC_DONT) 622e0d8c1b7SWei Wang harderr = 1; 62393b36cf3SHannes Frederic Sowa } 6241a462d18SDuan Jiong if (type == NDISC_REDIRECT) { 625a36e185eSStefano Brivio if (tunnel) { 626a36e185eSStefano Brivio ip6_redirect(skb, sock_net(sk), inet6_iif(skb), 627a36e185eSStefano Brivio sk->sk_mark, sk->sk_uid); 628a36e185eSStefano Brivio } else { 629ec18d9a2SDavid S. Miller ip6_sk_redirect(skb, sk); 630a36e185eSStefano Brivio } 6311a462d18SDuan Jiong goto out; 6321a462d18SDuan Jiong } 63381aded24SDavid S. Miller 634a36e185eSStefano Brivio /* Tunnels don't have an application socket: don't pass errors back */ 635ac56a0b4SDavid Howells if (tunnel) { 636ac56a0b4SDavid Howells if (udp_sk(sk)->encap_err_rcv) 63742fb06b3SDavid Howells udp_sk(sk)->encap_err_rcv(sk, skb, err, uh->dest, 63842fb06b3SDavid Howells ntohl(info), (u8 *)(uh+1)); 639a36e185eSStefano Brivio goto out; 640ac56a0b4SDavid Howells } 641a36e185eSStefano Brivio 642e0d8c1b7SWei Wang if (!np->recverr) { 643e0d8c1b7SWei Wang if (!harderr || sk->sk_state != TCP_ESTABLISHED) 644db8dac20SDavid S. Miller goto out; 645e0d8c1b7SWei Wang } else { 646db8dac20SDavid S. Miller ipv6_icmp_error(sk, skb, err, uh->dest, ntohl(info), (u8 *)(uh+1)); 647e0d8c1b7SWei Wang } 648b1faf566SEric Dumazet 649db8dac20SDavid S. Miller sk->sk_err = err; 650e3ae2365SAlexander Aring sk_error_report(sk); 651db8dac20SDavid S. Miller out: 65232bbd879SStefano Brivio return 0; 653db8dac20SDavid S. Miller } 654db8dac20SDavid S. Miller 655a3f96c47SPaolo Abeni static int __udpv6_queue_rcv_skb(struct sock *sk, struct sk_buff *skb) 656f7ad74feSBenjamin LaHaise { 657f7ad74feSBenjamin LaHaise int rc; 658f7ad74feSBenjamin LaHaise 659efe4208fSEric Dumazet if (!ipv6_addr_any(&sk->sk_v6_daddr)) { 660f7ad74feSBenjamin LaHaise sock_rps_save_rxhash(sk, skb); 661005ec974SShawn Bohrer sk_mark_napi_id(sk, skb); 6622c8c56e1SEric Dumazet sk_incoming_cpu_update(sk); 663e68b6e50SEric Dumazet } else { 664e68b6e50SEric Dumazet sk_mark_napi_id_once(sk, skb); 665005ec974SShawn Bohrer } 666f7ad74feSBenjamin LaHaise 667850cbaddSPaolo Abeni rc = __udp_enqueue_schedule_skb(sk, skb); 668f7ad74feSBenjamin LaHaise if (rc < 0) { 669f7ad74feSBenjamin LaHaise int is_udplite = IS_UDPLITE(sk); 6700d92efdeSDonald Hunter enum skb_drop_reason drop_reason; 671f7ad74feSBenjamin LaHaise 672f7ad74feSBenjamin LaHaise /* Note that an ENOMEM error is charged twice */ 6730d92efdeSDonald Hunter if (rc == -ENOMEM) { 674e61da9e2SEric Dumazet UDP6_INC_STATS(sock_net(sk), 675f7ad74feSBenjamin LaHaise UDP_MIB_RCVBUFERRORS, is_udplite); 6760d92efdeSDonald Hunter drop_reason = SKB_DROP_REASON_SOCKET_RCVBUFF; 6770d92efdeSDonald Hunter } else { 678a3ce2b10SMenglong Dong UDP6_INC_STATS(sock_net(sk), 679a3ce2b10SMenglong Dong UDP_MIB_MEMERRORS, is_udplite); 6800d92efdeSDonald Hunter drop_reason = SKB_DROP_REASON_PROTO_MEM; 6810d92efdeSDonald Hunter } 682e61da9e2SEric Dumazet UDP6_INC_STATS(sock_net(sk), UDP_MIB_INERRORS, is_udplite); 6830d92efdeSDonald Hunter kfree_skb_reason(skb, drop_reason); 684*8139dccdSIvan Babrou trace_udp_fail_queue_rcv_skb(rc, sk); 685f7ad74feSBenjamin LaHaise return -1; 686f7ad74feSBenjamin LaHaise } 687850cbaddSPaolo Abeni 688f7ad74feSBenjamin LaHaise return 0; 689f7ad74feSBenjamin LaHaise } 690f7ad74feSBenjamin LaHaise 69132bbd879SStefano Brivio static __inline__ int udpv6_err(struct sk_buff *skb, 692d5fdd6baSBrian Haley struct inet6_skb_parm *opt, u8 type, 693d5fdd6baSBrian Haley u8 code, int offset, __be32 info) 694db8dac20SDavid S. Miller { 695ba6aac15SKuniyuki Iwashima return __udp6_lib_err(skb, opt, type, code, offset, info, 696ba6aac15SKuniyuki Iwashima dev_net(skb->dev)->ipv4.udp_table); 697db8dac20SDavid S. Miller } 698db8dac20SDavid S. Miller 699cf329aa4SPaolo Abeni static int udpv6_queue_rcv_one_skb(struct sock *sk, struct sk_buff *skb) 700db8dac20SDavid S. Miller { 7010d92efdeSDonald Hunter enum skb_drop_reason drop_reason = SKB_DROP_REASON_NOT_SPECIFIED; 702db8dac20SDavid S. Miller struct udp_sock *up = udp_sk(sk); 703db8dac20SDavid S. Miller int is_udplite = IS_UDPLITE(sk); 704db8dac20SDavid S. Miller 7050d92efdeSDonald Hunter if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb)) { 7060d92efdeSDonald Hunter drop_reason = SKB_DROP_REASON_XFRM_POLICY; 707db8dac20SDavid S. Miller goto drop; 7080d92efdeSDonald Hunter } 709b0e214d2SMadhu Koriginja nf_reset_ct(skb); 710db8dac20SDavid S. Miller 71188ab3108SDavidlohr Bueso if (static_branch_unlikely(&udpv6_encap_needed_key) && up->encap_type) { 712d7f3f621SBenjamin LaHaise int (*encap_rcv)(struct sock *sk, struct sk_buff *skb); 713d7f3f621SBenjamin LaHaise 714d7f3f621SBenjamin LaHaise /* 715d7f3f621SBenjamin LaHaise * This is an encapsulation socket so pass the skb to 716d7f3f621SBenjamin LaHaise * the socket's udp_encap_rcv() hook. Otherwise, just 717d7f3f621SBenjamin LaHaise * fall through and pass this up the UDP socket. 718d7f3f621SBenjamin LaHaise * up->encap_rcv() returns the following value: 719d7f3f621SBenjamin LaHaise * =0 if skb was successfully passed to the encap 720d7f3f621SBenjamin LaHaise * handler or was discarded by it. 721d7f3f621SBenjamin LaHaise * >0 if skb should be passed on to UDP. 722d7f3f621SBenjamin LaHaise * <0 if skb should be resubmitted as proto -N 723d7f3f621SBenjamin LaHaise */ 724d7f3f621SBenjamin LaHaise 725d7f3f621SBenjamin LaHaise /* if we're overly short, let UDP handle it */ 7266aa7de05SMark Rutland encap_rcv = READ_ONCE(up->encap_rcv); 727e5aed006SHannes Frederic Sowa if (encap_rcv) { 728d7f3f621SBenjamin LaHaise int ret; 729d7f3f621SBenjamin LaHaise 7300a80966bSTom Herbert /* Verify checksum before giving to encap */ 7310a80966bSTom Herbert if (udp_lib_checksum_complete(skb)) 7320a80966bSTom Herbert goto csum_error; 7330a80966bSTom Herbert 734d7f3f621SBenjamin LaHaise ret = encap_rcv(sk, skb); 735d7f3f621SBenjamin LaHaise if (ret <= 0) { 736250962e4SMenglong Dong __UDP6_INC_STATS(sock_net(sk), 737d7f3f621SBenjamin LaHaise UDP_MIB_INDATAGRAMS, 738d7f3f621SBenjamin LaHaise is_udplite); 739d7f3f621SBenjamin LaHaise return -ret; 740d7f3f621SBenjamin LaHaise } 741d7f3f621SBenjamin LaHaise } 742d7f3f621SBenjamin LaHaise 743d7f3f621SBenjamin LaHaise /* FALLTHROUGH -- it's a UDP Packet */ 744d7f3f621SBenjamin LaHaise } 745d7f3f621SBenjamin LaHaise 746db8dac20SDavid S. Miller /* 747db8dac20SDavid S. Miller * UDP-Lite specific tests, ignored on UDP sockets (see net/ipv4/udp.c). 748db8dac20SDavid S. Miller */ 749b0a42277SMiaohe Lin if ((up->pcflag & UDPLITE_RECV_CC) && UDP_SKB_CB(skb)->partial_cov) { 750db8dac20SDavid S. Miller 751db8dac20SDavid S. Miller if (up->pcrlen == 0) { /* full coverage was set */ 752ba7a46f1SJoe Perches net_dbg_ratelimited("UDPLITE6: partial coverage %d while full coverage %d requested\n", 753db8dac20SDavid S. Miller UDP_SKB_CB(skb)->cscov, skb->len); 754db8dac20SDavid S. Miller goto drop; 755db8dac20SDavid S. Miller } 756db8dac20SDavid S. Miller if (UDP_SKB_CB(skb)->cscov < up->pcrlen) { 757ba7a46f1SJoe Perches net_dbg_ratelimited("UDPLITE6: coverage %d too small, need min %d\n", 758db8dac20SDavid S. Miller UDP_SKB_CB(skb)->cscov, up->pcrlen); 759db8dac20SDavid S. Miller goto drop; 760db8dac20SDavid S. Miller } 761db8dac20SDavid S. Miller } 762db8dac20SDavid S. Miller 7634b943faeSPaolo Abeni prefetch(&sk->sk_rmem_alloc); 764ce25d66aSEric Dumazet if (rcu_access_pointer(sk->sk_filter) && 765ce25d66aSEric Dumazet udp_lib_checksum_complete(skb)) 7666a5dc9e5SEric Dumazet goto csum_error; 767ce25d66aSEric Dumazet 7680d92efdeSDonald Hunter if (sk_filter_trim_cap(sk, skb, sizeof(struct udphdr))) { 7690d92efdeSDonald Hunter drop_reason = SKB_DROP_REASON_SOCKET_FILTER; 770a6127697SMichal Kubeček goto drop; 7710d92efdeSDonald Hunter } 772db8dac20SDavid S. Miller 773e6afc8acSsamanthakumar udp_csum_pull_header(skb); 774cb80ef46SBenjamin LaHaise 775d826eb14SEric Dumazet skb_dst_drop(skb); 776db8dac20SDavid S. Miller 777850cbaddSPaolo Abeni return __udpv6_queue_rcv_skb(sk, skb); 7783e215c8dSJames M Leddy 7796a5dc9e5SEric Dumazet csum_error: 7800d92efdeSDonald Hunter drop_reason = SKB_DROP_REASON_UDP_CSUM; 78102c22347SEric Dumazet __UDP6_INC_STATS(sock_net(sk), UDP_MIB_CSUMERRORS, is_udplite); 782db8dac20SDavid S. Miller drop: 78302c22347SEric Dumazet __UDP6_INC_STATS(sock_net(sk), UDP_MIB_INERRORS, is_udplite); 784cb80ef46SBenjamin LaHaise atomic_inc(&sk->sk_drops); 7850d92efdeSDonald Hunter kfree_skb_reason(skb, drop_reason); 786db8dac20SDavid S. Miller return -1; 787db8dac20SDavid S. Miller } 788db8dac20SDavid S. Miller 789cf329aa4SPaolo Abeni static int udpv6_queue_rcv_skb(struct sock *sk, struct sk_buff *skb) 790cf329aa4SPaolo Abeni { 791cf329aa4SPaolo Abeni struct sk_buff *next, *segs; 792cf329aa4SPaolo Abeni int ret; 793cf329aa4SPaolo Abeni 794cf329aa4SPaolo Abeni if (likely(!udp_unexpected_gso(sk, skb))) 795cf329aa4SPaolo Abeni return udpv6_queue_rcv_one_skb(sk, skb); 796cf329aa4SPaolo Abeni 797cf329aa4SPaolo Abeni __skb_push(skb, -skb_mac_offset(skb)); 798cf329aa4SPaolo Abeni segs = udp_rcv_segment(sk, skb, false); 7991a186c14SJason A. Donenfeld skb_list_walk_safe(segs, skb, next) { 800cf329aa4SPaolo Abeni __skb_pull(skb, skb_transport_offset(skb)); 801cf329aa4SPaolo Abeni 802000ac44dSPaolo Abeni udp_post_segment_fix_csum(skb); 803cf329aa4SPaolo Abeni ret = udpv6_queue_rcv_one_skb(sk, skb); 804cf329aa4SPaolo Abeni if (ret > 0) 805cf329aa4SPaolo Abeni ip6_protocol_deliver_rcu(dev_net(skb->dev), skb, ret, 806cf329aa4SPaolo Abeni true); 807cf329aa4SPaolo Abeni } 808cf329aa4SPaolo Abeni return 0; 809cf329aa4SPaolo Abeni } 810cf329aa4SPaolo Abeni 811dc3731baSEric Dumazet static bool __udp_v6_is_mcast_sock(struct net *net, const struct sock *sk, 812b71d1d42SEric Dumazet __be16 loc_port, const struct in6_addr *loc_addr, 813b71d1d42SEric Dumazet __be16 rmt_port, const struct in6_addr *rmt_addr, 8147bd2db40SDewi Morgan int dif, int sdif, unsigned short hnum) 815db8dac20SDavid S. Miller { 816dc3731baSEric Dumazet const struct inet_sock *inet = inet_sk(sk); 817db8dac20SDavid S. Miller 8189e89fd8bSSven Wegener if (!net_eq(sock_net(sk), net)) 8195cf3d461SDavid Held return false; 820b8ad0cbcSDaniel Lezcano 8215cf3d461SDavid Held if (udp_sk(sk)->udp_port_hash != hnum || 8225cf3d461SDavid Held sk->sk_family != PF_INET6 || 8235cf3d461SDavid Held (inet->inet_dport && inet->inet_dport != rmt_port) || 8245cf3d461SDavid Held (!ipv6_addr_any(&sk->sk_v6_daddr) && 8255cf3d461SDavid Held !ipv6_addr_equal(&sk->sk_v6_daddr, rmt_addr)) || 8264c971d2fSEric Dumazet !udp_sk_bound_dev_eq(net, READ_ONCE(sk->sk_bound_dev_if), dif, sdif) || 82733b4b015SHenning Rogge (!ipv6_addr_any(&sk->sk_v6_rcv_saddr) && 82833b4b015SHenning Rogge !ipv6_addr_equal(&sk->sk_v6_rcv_saddr, loc_addr))) 8295cf3d461SDavid Held return false; 8309e89fd8bSSven Wegener if (!inet6_mc_check(sk, loc_addr, rmt_addr)) 8315cf3d461SDavid Held return false; 8325cf3d461SDavid Held return true; 833db8dac20SDavid S. Miller } 834db8dac20SDavid S. Miller 8354068579eSTom Herbert static void udp6_csum_zero_error(struct sk_buff *skb) 8364068579eSTom Herbert { 8374068579eSTom Herbert /* RFC 2460 section 8.1 says that we SHOULD log 8384068579eSTom Herbert * this error. Well, it is reasonable. 8394068579eSTom Herbert */ 840ba7a46f1SJoe Perches net_dbg_ratelimited("IPv6: udp checksum is 0 for [%pI6c]:%u->[%pI6c]:%u\n", 8414068579eSTom Herbert &ipv6_hdr(skb)->saddr, ntohs(udp_hdr(skb)->source), 8424068579eSTom Herbert &ipv6_hdr(skb)->daddr, ntohs(udp_hdr(skb)->dest)); 8434068579eSTom Herbert } 8444068579eSTom Herbert 845db8dac20SDavid S. Miller /* 846db8dac20SDavid S. Miller * Note: called only from the BH handler context, 847db8dac20SDavid S. Miller * so we don't need to lock the hashes. 848db8dac20SDavid S. Miller */ 849e3163493SPavel Emelyanov static int __udp6_lib_mcast_deliver(struct net *net, struct sk_buff *skb, 850b71d1d42SEric Dumazet const struct in6_addr *saddr, const struct in6_addr *daddr, 85136cbb245SRick Jones struct udp_table *udptable, int proto) 852db8dac20SDavid S. Miller { 853ca065d0cSEric Dumazet struct sock *sk, *first = NULL; 854db8dac20SDavid S. Miller const struct udphdr *uh = udp_hdr(skb); 8555cf3d461SDavid Held unsigned short hnum = ntohs(uh->dest); 8565cf3d461SDavid Held struct udp_hslot *hslot = udp_hashslot(udptable, net, hnum); 857ca065d0cSEric Dumazet unsigned int offset = offsetof(typeof(*sk), sk_node); 8582dc41cffSDavid Held unsigned int hash2 = 0, hash2_any = 0, use_hash2 = (hslot->count > 10); 859ca065d0cSEric Dumazet int dif = inet6_iif(skb); 8607bd2db40SDewi Morgan int sdif = inet6_sdif(skb); 861ca065d0cSEric Dumazet struct hlist_node *node; 862ca065d0cSEric Dumazet struct sk_buff *nskb; 8632dc41cffSDavid Held 8642dc41cffSDavid Held if (use_hash2) { 865f0b1e64cSMartin KaFai Lau hash2_any = ipv6_portaddr_hash(net, &in6addr_any, hnum) & 86673e2d5e3SPablo Neira udptable->mask; 867f0b1e64cSMartin KaFai Lau hash2 = ipv6_portaddr_hash(net, daddr, hnum) & udptable->mask; 8682dc41cffSDavid Held start_lookup: 86973e2d5e3SPablo Neira hslot = &udptable->hash2[hash2]; 8702dc41cffSDavid Held offset = offsetof(typeof(*sk), __sk_common.skc_portaddr_node); 8712dc41cffSDavid Held } 872db8dac20SDavid S. Miller 873ca065d0cSEric Dumazet sk_for_each_entry_offset_rcu(sk, node, &hslot->head, offset) { 874ca065d0cSEric Dumazet if (!__udp_v6_is_mcast_sock(net, sk, uh->dest, daddr, 8757bd2db40SDewi Morgan uh->source, saddr, dif, sdif, 8767bd2db40SDewi Morgan hnum)) 877ca065d0cSEric Dumazet continue; 8781c19448cSTom Herbert /* If zero checksum and no_check is not on for 8794068579eSTom Herbert * the socket then skip it. 8804068579eSTom Herbert */ 881ca065d0cSEric Dumazet if (!uh->check && !udp_sk(sk)->no_check6_rx) 882ca065d0cSEric Dumazet continue; 883ca065d0cSEric Dumazet if (!first) { 884ca065d0cSEric Dumazet first = sk; 885ca065d0cSEric Dumazet continue; 886db8dac20SDavid S. Miller } 887ca065d0cSEric Dumazet nskb = skb_clone(skb, GFP_ATOMIC); 888ca065d0cSEric Dumazet if (unlikely(!nskb)) { 889ca065d0cSEric Dumazet atomic_inc(&sk->sk_drops); 89002c22347SEric Dumazet __UDP6_INC_STATS(net, UDP_MIB_RCVBUFERRORS, 891ca065d0cSEric Dumazet IS_UDPLITE(sk)); 89202c22347SEric Dumazet __UDP6_INC_STATS(net, UDP_MIB_INERRORS, 893ca065d0cSEric Dumazet IS_UDPLITE(sk)); 894ca065d0cSEric Dumazet continue; 895a1ab77f9SEric Dumazet } 896db8dac20SDavid S. Miller 897ca065d0cSEric Dumazet if (udpv6_queue_rcv_skb(sk, nskb) > 0) 898ca065d0cSEric Dumazet consume_skb(nskb); 899ca065d0cSEric Dumazet } 900a1ab77f9SEric Dumazet 9012dc41cffSDavid Held /* Also lookup *:port if we are using hash2 and haven't done so yet. */ 9022dc41cffSDavid Held if (use_hash2 && hash2 != hash2_any) { 9032dc41cffSDavid Held hash2 = hash2_any; 9042dc41cffSDavid Held goto start_lookup; 9052dc41cffSDavid Held } 9062dc41cffSDavid Held 907ca065d0cSEric Dumazet if (first) { 908ca065d0cSEric Dumazet if (udpv6_queue_rcv_skb(first, skb) > 0) 909ca065d0cSEric Dumazet consume_skb(skb); 910a1ab77f9SEric Dumazet } else { 911ca065d0cSEric Dumazet kfree_skb(skb); 91202c22347SEric Dumazet __UDP6_INC_STATS(net, UDP_MIB_IGNOREDMULTI, 91336cbb245SRick Jones proto == IPPROTO_UDPLITE); 914a1ab77f9SEric Dumazet } 915db8dac20SDavid S. Miller return 0; 916db8dac20SDavid S. Miller } 917db8dac20SDavid S. Miller 91864f0f5d1SPaolo Abeni static void udp6_sk_rx_dst_set(struct sock *sk, struct dst_entry *dst) 91964f0f5d1SPaolo Abeni { 92064f0f5d1SPaolo Abeni if (udp_sk_rx_dst_set(sk, dst)) { 92164f0f5d1SPaolo Abeni const struct rt6_info *rt = (const struct rt6_info *)dst; 92264f0f5d1SPaolo Abeni 923ef57c161SEric Dumazet sk->sk_rx_dst_cookie = rt6_get_cookie(rt); 92464f0f5d1SPaolo Abeni } 92564f0f5d1SPaolo Abeni } 92664f0f5d1SPaolo Abeni 927eb63f296SPaolo Abeni /* wrapper for udp_queue_rcv_skb tacking care of csum conversion and 928eb63f296SPaolo Abeni * return code conversion for ip layer consumption 929eb63f296SPaolo Abeni */ 930eb63f296SPaolo Abeni static int udp6_unicast_rcv_skb(struct sock *sk, struct sk_buff *skb, 931eb63f296SPaolo Abeni struct udphdr *uh) 932eb63f296SPaolo Abeni { 933eb63f296SPaolo Abeni int ret; 934eb63f296SPaolo Abeni 935eb63f296SPaolo Abeni if (inet_get_convert_csum(sk) && uh->check && !IS_UDPLITE(sk)) 936e4aa33adSLi RongQing skb_checksum_try_convert(skb, IPPROTO_UDP, ip6_compute_pseudo); 937eb63f296SPaolo Abeni 938eb63f296SPaolo Abeni ret = udpv6_queue_rcv_skb(sk, skb); 939eb63f296SPaolo Abeni 94084dad559SPaolo Abeni /* a return value > 0 means to resubmit the input */ 941eb63f296SPaolo Abeni if (ret > 0) 94284dad559SPaolo Abeni return ret; 943eb63f296SPaolo Abeni return 0; 944eb63f296SPaolo Abeni } 945eb63f296SPaolo Abeni 946645ca708SEric Dumazet int __udp6_lib_rcv(struct sk_buff *skb, struct udp_table *udptable, 947db8dac20SDavid S. Miller int proto) 948db8dac20SDavid S. Miller { 9494cf91f82SDavid Ahern enum skb_drop_reason reason = SKB_DROP_REASON_NOT_SPECIFIED; 950b71d1d42SEric Dumazet const struct in6_addr *saddr, *daddr; 951ca065d0cSEric Dumazet struct net *net = dev_net(skb->dev); 952ca065d0cSEric Dumazet struct udphdr *uh; 953ca065d0cSEric Dumazet struct sock *sk; 95471489e21SJoe Stringer bool refcounted; 955db8dac20SDavid S. Miller u32 ulen = 0; 956db8dac20SDavid S. Miller 957db8dac20SDavid S. Miller if (!pskb_may_pull(skb, sizeof(struct udphdr))) 958d6bc0149SBjørn Mork goto discard; 959db8dac20SDavid S. Miller 960db8dac20SDavid S. Miller saddr = &ipv6_hdr(skb)->saddr; 961db8dac20SDavid S. Miller daddr = &ipv6_hdr(skb)->daddr; 962db8dac20SDavid S. Miller uh = udp_hdr(skb); 963db8dac20SDavid S. Miller 964db8dac20SDavid S. Miller ulen = ntohs(uh->len); 965db8dac20SDavid S. Miller if (ulen > skb->len) 966db8dac20SDavid S. Miller goto short_packet; 967db8dac20SDavid S. Miller 968db8dac20SDavid S. Miller if (proto == IPPROTO_UDP) { 969db8dac20SDavid S. Miller /* UDP validates ulen. */ 970db8dac20SDavid S. Miller 971db8dac20SDavid S. Miller /* Check for jumbo payload */ 972db8dac20SDavid S. Miller if (ulen == 0) 973db8dac20SDavid S. Miller ulen = skb->len; 974db8dac20SDavid S. Miller 975db8dac20SDavid S. Miller if (ulen < sizeof(*uh)) 976db8dac20SDavid S. Miller goto short_packet; 977db8dac20SDavid S. Miller 978db8dac20SDavid S. Miller if (ulen < skb->len) { 979db8dac20SDavid S. Miller if (pskb_trim_rcsum(skb, ulen)) 980db8dac20SDavid S. Miller goto short_packet; 981db8dac20SDavid S. Miller saddr = &ipv6_hdr(skb)->saddr; 982db8dac20SDavid S. Miller daddr = &ipv6_hdr(skb)->daddr; 983db8dac20SDavid S. Miller uh = udp_hdr(skb); 984db8dac20SDavid S. Miller } 985db8dac20SDavid S. Miller } 986db8dac20SDavid S. Miller 987db8dac20SDavid S. Miller if (udp6_csum_init(skb, uh, proto)) 9886a5dc9e5SEric Dumazet goto csum_error; 989db8dac20SDavid S. Miller 990c9f2c1aeSPaolo Abeni /* Check if the socket is already available, e.g. due to early demux */ 99171489e21SJoe Stringer sk = skb_steal_sock(skb, &refcounted); 992c9f2c1aeSPaolo Abeni if (sk) { 993c9f2c1aeSPaolo Abeni struct dst_entry *dst = skb_dst(skb); 994c9f2c1aeSPaolo Abeni int ret; 995c9f2c1aeSPaolo Abeni 9968f905c0eSEric Dumazet if (unlikely(rcu_dereference(sk->sk_rx_dst) != dst)) 99764f0f5d1SPaolo Abeni udp6_sk_rx_dst_set(sk, dst); 998c9f2c1aeSPaolo Abeni 999eb63f296SPaolo Abeni if (!uh->check && !udp_sk(sk)->no_check6_rx) { 100071489e21SJoe Stringer if (refcounted) 1001c9f2c1aeSPaolo Abeni sock_put(sk); 1002eb63f296SPaolo Abeni goto report_csum_error; 1003eb63f296SPaolo Abeni } 1004c9f2c1aeSPaolo Abeni 1005eb63f296SPaolo Abeni ret = udp6_unicast_rcv_skb(sk, skb, uh); 100671489e21SJoe Stringer if (refcounted) 1007eb63f296SPaolo Abeni sock_put(sk); 1008c9f2c1aeSPaolo Abeni return ret; 1009c9f2c1aeSPaolo Abeni } 1010c9f2c1aeSPaolo Abeni 1011db8dac20SDavid S. Miller /* 1012db8dac20SDavid S. Miller * Multicast receive code 1013db8dac20SDavid S. Miller */ 1014db8dac20SDavid S. Miller if (ipv6_addr_is_multicast(daddr)) 1015e3163493SPavel Emelyanov return __udp6_lib_mcast_deliver(net, skb, 101636cbb245SRick Jones saddr, daddr, udptable, proto); 1017db8dac20SDavid S. Miller 1018db8dac20SDavid S. Miller /* Unicast */ 1019607c4aafSKOVACS Krisztian sk = __udp6_lib_lookup_skb(skb, uh->source, uh->dest, udptable); 102053b24b8fSIan Morris if (sk) { 1021eb63f296SPaolo Abeni if (!uh->check && !udp_sk(sk)->no_check6_rx) 1022eb63f296SPaolo Abeni goto report_csum_error; 1023eb63f296SPaolo Abeni return udp6_unicast_rcv_skb(sk, skb, uh); 10244068579eSTom Herbert } 10254068579eSTom Herbert 10264cf91f82SDavid Ahern reason = SKB_DROP_REASON_NO_SOCKET; 10274cf91f82SDavid Ahern 1028eb63f296SPaolo Abeni if (!uh->check) 1029eb63f296SPaolo Abeni goto report_csum_error; 10304068579eSTom Herbert 1031db8dac20SDavid S. Miller if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) 1032db8dac20SDavid S. Miller goto discard; 1033b0e214d2SMadhu Koriginja nf_reset_ct(skb); 1034db8dac20SDavid S. Miller 1035db8dac20SDavid S. Miller if (udp_lib_checksum_complete(skb)) 10366a5dc9e5SEric Dumazet goto csum_error; 1037db8dac20SDavid S. Miller 103802c22347SEric Dumazet __UDP6_INC_STATS(net, UDP_MIB_NOPORTS, proto == IPPROTO_UDPLITE); 10393ffe533cSAlexey Dobriyan icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0); 1040db8dac20SDavid S. Miller 10414cf91f82SDavid Ahern kfree_skb_reason(skb, reason); 1042db8dac20SDavid S. Miller return 0; 1043db8dac20SDavid S. Miller 1044db8dac20SDavid S. Miller short_packet: 10454cf91f82SDavid Ahern if (reason == SKB_DROP_REASON_NOT_SPECIFIED) 10464cf91f82SDavid Ahern reason = SKB_DROP_REASON_PKT_TOO_SMALL; 1047ba7a46f1SJoe Perches net_dbg_ratelimited("UDP%sv6: short packet: From [%pI6c]:%u %d/%d to [%pI6c]:%u\n", 1048db8dac20SDavid S. Miller proto == IPPROTO_UDPLITE ? "-Lite" : "", 1049ba7a46f1SJoe Perches saddr, ntohs(uh->source), 1050ba7a46f1SJoe Perches ulen, skb->len, 1051ba7a46f1SJoe Perches daddr, ntohs(uh->dest)); 10526a5dc9e5SEric Dumazet goto discard; 1053eb63f296SPaolo Abeni 1054eb63f296SPaolo Abeni report_csum_error: 1055eb63f296SPaolo Abeni udp6_csum_zero_error(skb); 10566a5dc9e5SEric Dumazet csum_error: 10574cf91f82SDavid Ahern if (reason == SKB_DROP_REASON_NOT_SPECIFIED) 10584cf91f82SDavid Ahern reason = SKB_DROP_REASON_UDP_CSUM; 105902c22347SEric Dumazet __UDP6_INC_STATS(net, UDP_MIB_CSUMERRORS, proto == IPPROTO_UDPLITE); 1060db8dac20SDavid S. Miller discard: 106102c22347SEric Dumazet __UDP6_INC_STATS(net, UDP_MIB_INERRORS, proto == IPPROTO_UDPLITE); 10624cf91f82SDavid Ahern kfree_skb_reason(skb, reason); 1063db8dac20SDavid S. Miller return 0; 1064db8dac20SDavid S. Miller } 1065db8dac20SDavid S. Miller 10660bd84065Ssubashab@codeaurora.org 10675425077dSsubashab@codeaurora.org static struct sock *__udp6_lib_demux_lookup(struct net *net, 10685425077dSsubashab@codeaurora.org __be16 loc_port, const struct in6_addr *loc_addr, 10695425077dSsubashab@codeaurora.org __be16 rmt_port, const struct in6_addr *rmt_addr, 10704297a0efSDavid Ahern int dif, int sdif) 10715425077dSsubashab@codeaurora.org { 1072ba6aac15SKuniyuki Iwashima struct udp_table *udptable = net->ipv4.udp_table; 10730bd84065Ssubashab@codeaurora.org unsigned short hnum = ntohs(loc_port); 1074919dfa0bSKuniyuki Iwashima unsigned int hash2, slot2; 1075919dfa0bSKuniyuki Iwashima struct udp_hslot *hslot2; 1076919dfa0bSKuniyuki Iwashima __portpair ports; 10775425077dSsubashab@codeaurora.org struct sock *sk; 10785425077dSsubashab@codeaurora.org 1079919dfa0bSKuniyuki Iwashima hash2 = ipv6_portaddr_hash(net, loc_addr, hnum); 1080ba6aac15SKuniyuki Iwashima slot2 = hash2 & udptable->mask; 1081ba6aac15SKuniyuki Iwashima hslot2 = &udptable->hash2[slot2]; 1082919dfa0bSKuniyuki Iwashima ports = INET_COMBINED_PORTS(rmt_port, hnum); 1083919dfa0bSKuniyuki Iwashima 10840bd84065Ssubashab@codeaurora.org udp_portaddr_for_each_entry_rcu(sk, &hslot2->head) { 108585cb73ffSWei Wang if (sk->sk_state == TCP_ESTABLISHED && 10865d368f03SEric Dumazet inet6_match(net, sk, rmt_addr, loc_addr, ports, dif, sdif)) 10875425077dSsubashab@codeaurora.org return sk; 10880bd84065Ssubashab@codeaurora.org /* Only check first socket in chain */ 10890bd84065Ssubashab@codeaurora.org break; 10900bd84065Ssubashab@codeaurora.org } 10910bd84065Ssubashab@codeaurora.org return NULL; 10925425077dSsubashab@codeaurora.org } 10935425077dSsubashab@codeaurora.org 109411052589SKuniyuki Iwashima void udp_v6_early_demux(struct sk_buff *skb) 10955425077dSsubashab@codeaurora.org { 10965425077dSsubashab@codeaurora.org struct net *net = dev_net(skb->dev); 10975425077dSsubashab@codeaurora.org const struct udphdr *uh; 10985425077dSsubashab@codeaurora.org struct sock *sk; 10995425077dSsubashab@codeaurora.org struct dst_entry *dst; 11005425077dSsubashab@codeaurora.org int dif = skb->dev->ifindex; 11014297a0efSDavid Ahern int sdif = inet6_sdif(skb); 11025425077dSsubashab@codeaurora.org 11035425077dSsubashab@codeaurora.org if (!pskb_may_pull(skb, skb_transport_offset(skb) + 11045425077dSsubashab@codeaurora.org sizeof(struct udphdr))) 11055425077dSsubashab@codeaurora.org return; 11065425077dSsubashab@codeaurora.org 11075425077dSsubashab@codeaurora.org uh = udp_hdr(skb); 11085425077dSsubashab@codeaurora.org 11095425077dSsubashab@codeaurora.org if (skb->pkt_type == PACKET_HOST) 11105425077dSsubashab@codeaurora.org sk = __udp6_lib_demux_lookup(net, uh->dest, 11115425077dSsubashab@codeaurora.org &ipv6_hdr(skb)->daddr, 11125425077dSsubashab@codeaurora.org uh->source, &ipv6_hdr(skb)->saddr, 11134297a0efSDavid Ahern dif, sdif); 11145425077dSsubashab@codeaurora.org else 11155425077dSsubashab@codeaurora.org return; 11165425077dSsubashab@codeaurora.org 111741c6d650SReshetova, Elena if (!sk || !refcount_inc_not_zero(&sk->sk_refcnt)) 11185425077dSsubashab@codeaurora.org return; 11195425077dSsubashab@codeaurora.org 11205425077dSsubashab@codeaurora.org skb->sk = sk; 11215425077dSsubashab@codeaurora.org skb->destructor = sock_efree; 11228f905c0eSEric Dumazet dst = rcu_dereference(sk->sk_rx_dst); 11235425077dSsubashab@codeaurora.org 11245425077dSsubashab@codeaurora.org if (dst) 1125ef57c161SEric Dumazet dst = dst_check(dst, sk->sk_rx_dst_cookie); 11265425077dSsubashab@codeaurora.org if (dst) { 1127d24406c8SWei Wang /* set noref for now. 1128d24406c8SWei Wang * any place which wants to hold dst has to call 1129d24406c8SWei Wang * dst_hold_safe() 1130d24406c8SWei Wang */ 11315425077dSsubashab@codeaurora.org skb_dst_set_noref(skb, dst); 11325425077dSsubashab@codeaurora.org } 11335425077dSsubashab@codeaurora.org } 11345425077dSsubashab@codeaurora.org 11350e219ae4SPaolo Abeni INDIRECT_CALLABLE_SCOPE int udpv6_rcv(struct sk_buff *skb) 1136db8dac20SDavid S. Miller { 1137ba6aac15SKuniyuki Iwashima return __udp6_lib_rcv(skb, dev_net(skb->dev)->ipv4.udp_table, IPPROTO_UDP); 1138db8dac20SDavid S. Miller } 1139db8dac20SDavid S. Miller 1140db8dac20SDavid S. Miller /* 1141db8dac20SDavid S. Miller * Throw away all pending data and cancel the corking. Socket is locked. 1142db8dac20SDavid S. Miller */ 1143db8dac20SDavid S. Miller static void udp_v6_flush_pending_frames(struct sock *sk) 1144db8dac20SDavid S. Miller { 1145db8dac20SDavid S. Miller struct udp_sock *up = udp_sk(sk); 1146db8dac20SDavid S. Miller 114736d926b9SDenis V. Lunev if (up->pending == AF_INET) 114836d926b9SDenis V. Lunev udp_flush_pending_frames(sk); 114936d926b9SDenis V. Lunev else if (up->pending) { 1150db8dac20SDavid S. Miller up->len = 0; 1151db8dac20SDavid S. Miller up->pending = 0; 1152db8dac20SDavid S. Miller ip6_flush_pending_frames(sk); 1153db8dac20SDavid S. Miller } 1154db8dac20SDavid S. Miller } 1155db8dac20SDavid S. Miller 1156d74bad4eSAndrey Ignatov static int udpv6_pre_connect(struct sock *sk, struct sockaddr *uaddr, 1157d74bad4eSAndrey Ignatov int addr_len) 1158d74bad4eSAndrey Ignatov { 1159bddc028aSTetsuo Handa if (addr_len < offsetofend(struct sockaddr, sa_family)) 1160bddc028aSTetsuo Handa return -EINVAL; 1161d74bad4eSAndrey Ignatov /* The following checks are replicated from __ip6_datagram_connect() 1162d74bad4eSAndrey Ignatov * and intended to prevent BPF program called below from accessing 1163d74bad4eSAndrey Ignatov * bytes that are out of the bound specified by user in addr_len. 1164d74bad4eSAndrey Ignatov */ 1165d74bad4eSAndrey Ignatov if (uaddr->sa_family == AF_INET) { 116689e9c728SKuniyuki Iwashima if (ipv6_only_sock(sk)) 1167d74bad4eSAndrey Ignatov return -EAFNOSUPPORT; 1168d74bad4eSAndrey Ignatov return udp_pre_connect(sk, uaddr, addr_len); 1169d74bad4eSAndrey Ignatov } 1170d74bad4eSAndrey Ignatov 1171d74bad4eSAndrey Ignatov if (addr_len < SIN6_LEN_RFC2133) 1172d74bad4eSAndrey Ignatov return -EINVAL; 1173d74bad4eSAndrey Ignatov 1174d74bad4eSAndrey Ignatov return BPF_CGROUP_RUN_PROG_INET6_CONNECT_LOCK(sk, uaddr); 1175d74bad4eSAndrey Ignatov } 1176d74bad4eSAndrey Ignatov 1177493c6be3SSridhar Samudrala /** 1178493c6be3SSridhar Samudrala * udp6_hwcsum_outgoing - handle outgoing HW checksumming 1179493c6be3SSridhar Samudrala * @sk: socket we are sending on 1180493c6be3SSridhar Samudrala * @skb: sk_buff containing the filled-in UDP header 1181493c6be3SSridhar Samudrala * (checksum field must be zeroed out) 1182b51cd7c8SAndrew Lunn * @saddr: source address 1183b51cd7c8SAndrew Lunn * @daddr: destination address 1184b51cd7c8SAndrew Lunn * @len: length of packet 1185493c6be3SSridhar Samudrala */ 1186493c6be3SSridhar Samudrala static void udp6_hwcsum_outgoing(struct sock *sk, struct sk_buff *skb, 1187493c6be3SSridhar Samudrala const struct in6_addr *saddr, 1188493c6be3SSridhar Samudrala const struct in6_addr *daddr, int len) 1189493c6be3SSridhar Samudrala { 1190493c6be3SSridhar Samudrala unsigned int offset; 1191493c6be3SSridhar Samudrala struct udphdr *uh = udp_hdr(skb); 1192d39d938cSVlad Yasevich struct sk_buff *frags = skb_shinfo(skb)->frag_list; 1193493c6be3SSridhar Samudrala __wsum csum = 0; 1194493c6be3SSridhar Samudrala 1195d39d938cSVlad Yasevich if (!frags) { 1196493c6be3SSridhar Samudrala /* Only one fragment on the socket. */ 1197493c6be3SSridhar Samudrala skb->csum_start = skb_transport_header(skb) - skb->head; 1198493c6be3SSridhar Samudrala skb->csum_offset = offsetof(struct udphdr, check); 1199493c6be3SSridhar Samudrala uh->check = ~csum_ipv6_magic(saddr, daddr, len, IPPROTO_UDP, 0); 1200493c6be3SSridhar Samudrala } else { 1201493c6be3SSridhar Samudrala /* 1202493c6be3SSridhar Samudrala * HW-checksum won't work as there are two or more 1203493c6be3SSridhar Samudrala * fragments on the socket so that all csums of sk_buffs 1204493c6be3SSridhar Samudrala * should be together 1205493c6be3SSridhar Samudrala */ 1206493c6be3SSridhar Samudrala offset = skb_transport_offset(skb); 1207493c6be3SSridhar Samudrala skb->csum = skb_checksum(skb, offset, skb->len - offset, 0); 120863ecc3d9SSubash Abhinov Kasiviswanathan csum = skb->csum; 1209493c6be3SSridhar Samudrala 1210493c6be3SSridhar Samudrala skb->ip_summed = CHECKSUM_NONE; 1211493c6be3SSridhar Samudrala 1212d39d938cSVlad Yasevich do { 1213d39d938cSVlad Yasevich csum = csum_add(csum, frags->csum); 1214d39d938cSVlad Yasevich } while ((frags = frags->next)); 1215493c6be3SSridhar Samudrala 1216493c6be3SSridhar Samudrala uh->check = csum_ipv6_magic(saddr, daddr, len, IPPROTO_UDP, 1217493c6be3SSridhar Samudrala csum); 1218493c6be3SSridhar Samudrala if (uh->check == 0) 1219493c6be3SSridhar Samudrala uh->check = CSUM_MANGLED_0; 1220493c6be3SSridhar Samudrala } 1221493c6be3SSridhar Samudrala } 1222493c6be3SSridhar Samudrala 1223db8dac20SDavid S. Miller /* 1224db8dac20SDavid S. Miller * Sending 1225db8dac20SDavid S. Miller */ 1226db8dac20SDavid S. Miller 1227bec1f6f6SWillem de Bruijn static int udp_v6_send_skb(struct sk_buff *skb, struct flowi6 *fl6, 1228bec1f6f6SWillem de Bruijn struct inet_cork *cork) 1229db8dac20SDavid S. Miller { 1230d39d938cSVlad Yasevich struct sock *sk = skb->sk; 1231db8dac20SDavid S. Miller struct udphdr *uh; 1232db8dac20SDavid S. Miller int err = 0; 1233db8dac20SDavid S. Miller int is_udplite = IS_UDPLITE(sk); 1234db8dac20SDavid S. Miller __wsum csum = 0; 1235d39d938cSVlad Yasevich int offset = skb_transport_offset(skb); 1236d39d938cSVlad Yasevich int len = skb->len - offset; 12374094871dSJosh Hunt int datalen = len - sizeof(*uh); 1238db8dac20SDavid S. Miller 1239db8dac20SDavid S. Miller /* 1240db8dac20SDavid S. Miller * Create a UDP header 1241db8dac20SDavid S. Miller */ 1242db8dac20SDavid S. Miller uh = udp_hdr(skb); 12431958b856SDavid S. Miller uh->source = fl6->fl6_sport; 12441958b856SDavid S. Miller uh->dest = fl6->fl6_dport; 1245d39d938cSVlad Yasevich uh->len = htons(len); 1246db8dac20SDavid S. Miller uh->check = 0; 1247db8dac20SDavid S. Miller 1248bec1f6f6SWillem de Bruijn if (cork->gso_size) { 1249bec1f6f6SWillem de Bruijn const int hlen = skb_network_header_len(skb) + 1250bec1f6f6SWillem de Bruijn sizeof(struct udphdr); 1251bec1f6f6SWillem de Bruijn 12520f149c9fSWillem de Bruijn if (hlen + cork->gso_size > cork->fragsize) { 12530f149c9fSWillem de Bruijn kfree_skb(skb); 1254bec1f6f6SWillem de Bruijn return -EINVAL; 12550f149c9fSWillem de Bruijn } 1256736ef37fSCoco Li if (datalen > cork->gso_size * UDP_MAX_SEGMENTS) { 12570f149c9fSWillem de Bruijn kfree_skb(skb); 1258bec1f6f6SWillem de Bruijn return -EINVAL; 12590f149c9fSWillem de Bruijn } 12600f149c9fSWillem de Bruijn if (udp_sk(sk)->no_check6_tx) { 12610f149c9fSWillem de Bruijn kfree_skb(skb); 1262a8c744a8SWillem de Bruijn return -EINVAL; 12630f149c9fSWillem de Bruijn } 1264ff06342cSWillem de Bruijn if (skb->ip_summed != CHECKSUM_PARTIAL || is_udplite || 12650f149c9fSWillem de Bruijn dst_xfrm(skb_dst(skb))) { 12660f149c9fSWillem de Bruijn kfree_skb(skb); 1267bec1f6f6SWillem de Bruijn return -EIO; 12680f149c9fSWillem de Bruijn } 1269bec1f6f6SWillem de Bruijn 12704094871dSJosh Hunt if (datalen > cork->gso_size) { 1271bec1f6f6SWillem de Bruijn skb_shinfo(skb)->gso_size = cork->gso_size; 1272bec1f6f6SWillem de Bruijn skb_shinfo(skb)->gso_type = SKB_GSO_UDP_L4; 12734094871dSJosh Hunt skb_shinfo(skb)->gso_segs = DIV_ROUND_UP(datalen, 127444b321e5SJosh Hunt cork->gso_size); 12754094871dSJosh Hunt } 1276a8c744a8SWillem de Bruijn goto csum_partial; 1277bec1f6f6SWillem de Bruijn } 1278bec1f6f6SWillem de Bruijn 1279db8dac20SDavid S. Miller if (is_udplite) 1280d39d938cSVlad Yasevich csum = udplite_csum(skb); 1281d39d938cSVlad Yasevich else if (udp_sk(sk)->no_check6_tx) { /* UDP csum disabled */ 12824068579eSTom Herbert skb->ip_summed = CHECKSUM_NONE; 12834068579eSTom Herbert goto send; 12844068579eSTom Herbert } else if (skb->ip_summed == CHECKSUM_PARTIAL) { /* UDP hardware csum */ 1285a8c744a8SWillem de Bruijn csum_partial: 1286d39d938cSVlad Yasevich udp6_hwcsum_outgoing(sk, skb, &fl6->saddr, &fl6->daddr, len); 1287493c6be3SSridhar Samudrala goto send; 1288493c6be3SSridhar Samudrala } else 1289d39d938cSVlad Yasevich csum = udp_csum(skb); 1290db8dac20SDavid S. Miller 1291db8dac20SDavid S. Miller /* add protocol-dependent pseudo-header */ 12924c9483b2SDavid S. Miller uh->check = csum_ipv6_magic(&fl6->saddr, &fl6->daddr, 1293d39d938cSVlad Yasevich len, fl6->flowi6_proto, csum); 1294db8dac20SDavid S. Miller if (uh->check == 0) 1295db8dac20SDavid S. Miller uh->check = CSUM_MANGLED_0; 1296db8dac20SDavid S. Miller 1297493c6be3SSridhar Samudrala send: 1298d39d938cSVlad Yasevich err = ip6_send_skb(skb); 12996ce9e7b5SEric Dumazet if (err) { 13006ce9e7b5SEric Dumazet if (err == -ENOBUFS && !inet6_sk(sk)->recverr) { 13016aef70a8SEric Dumazet UDP6_INC_STATS(sock_net(sk), 13026ce9e7b5SEric Dumazet UDP_MIB_SNDBUFERRORS, is_udplite); 13036ce9e7b5SEric Dumazet err = 0; 13046ce9e7b5SEric Dumazet } 13056aef70a8SEric Dumazet } else { 13066aef70a8SEric Dumazet UDP6_INC_STATS(sock_net(sk), 13076ce9e7b5SEric Dumazet UDP_MIB_OUTDATAGRAMS, is_udplite); 13086aef70a8SEric Dumazet } 1309d39d938cSVlad Yasevich return err; 1310d39d938cSVlad Yasevich } 1311d39d938cSVlad Yasevich 1312d39d938cSVlad Yasevich static int udp_v6_push_pending_frames(struct sock *sk) 1313d39d938cSVlad Yasevich { 1314d39d938cSVlad Yasevich struct sk_buff *skb; 1315d39d938cSVlad Yasevich struct udp_sock *up = udp_sk(sk); 1316d39d938cSVlad Yasevich int err = 0; 1317d39d938cSVlad Yasevich 1318d39d938cSVlad Yasevich if (up->pending == AF_INET) 1319d39d938cSVlad Yasevich return udp_push_pending_frames(sk); 1320d39d938cSVlad Yasevich 1321d39d938cSVlad Yasevich skb = ip6_finish_skb(sk); 1322d39d938cSVlad Yasevich if (!skb) 1323d39d938cSVlad Yasevich goto out; 1324d39d938cSVlad Yasevich 1325940ea00bSPavel Begunkov err = udp_v6_send_skb(skb, &inet_sk(sk)->cork.fl.u.ip6, 1326940ea00bSPavel Begunkov &inet_sk(sk)->cork.base); 1327db8dac20SDavid S. Miller out: 1328db8dac20SDavid S. Miller up->len = 0; 1329db8dac20SDavid S. Miller up->pending = 0; 1330db8dac20SDavid S. Miller return err; 1331db8dac20SDavid S. Miller } 1332db8dac20SDavid S. Miller 13331b784140SYing Xue int udpv6_sendmsg(struct sock *sk, struct msghdr *msg, size_t len) 1334db8dac20SDavid S. Miller { 1335db8dac20SDavid S. Miller struct ipv6_txoptions opt_space; 1336db8dac20SDavid S. Miller struct udp_sock *up = udp_sk(sk); 1337db8dac20SDavid S. Miller struct inet_sock *inet = inet_sk(sk); 1338db8dac20SDavid S. Miller struct ipv6_pinfo *np = inet6_sk(sk); 1339342dfc30SSteffen Hurrle DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, msg->msg_name); 134020c59de2SArnaud Ebalard struct in6_addr *daddr, *final_p, final; 1341db8dac20SDavid S. Miller struct ipv6_txoptions *opt = NULL; 134245f6fad8SEric Dumazet struct ipv6_txoptions *opt_to_free = NULL; 1343db8dac20SDavid S. Miller struct ip6_flowlabel *flowlabel = NULL; 13445298953eSPavel Begunkov struct inet_cork_full cork; 13455298953eSPavel Begunkov struct flowi6 *fl6 = &cork.fl.u.ip6; 1346db8dac20SDavid S. Miller struct dst_entry *dst; 134726879da5SWei Wang struct ipcm6_cookie ipc6; 1348db8dac20SDavid S. Miller int addr_len = msg->msg_namelen; 13499f542f61SAlexey Kodanev bool connected = false; 1350db8dac20SDavid S. Miller int ulen = len; 1351a9f59707SEric Dumazet int corkreq = READ_ONCE(up->corkflag) || msg->msg_flags&MSG_MORE; 1352db8dac20SDavid S. Miller int err; 1353db8dac20SDavid S. Miller int is_udplite = IS_UDPLITE(sk); 1354db8dac20SDavid S. Miller int (*getfrag)(void *, char *, int, int, int, struct sk_buff *); 1355db8dac20SDavid S. Miller 1356b515430aSWillem de Bruijn ipcm6_init(&ipc6); 135718a419baSEric Dumazet ipc6.gso_size = READ_ONCE(up->gso_size); 13585fdaa88dSWillem de Bruijn ipc6.sockc.tsflags = sk->sk_tsflags; 1359c6af0c22SWillem de Bruijn ipc6.sockc.mark = sk->sk_mark; 136026879da5SWei Wang 1361db8dac20SDavid S. Miller /* destination address check */ 1362db8dac20SDavid S. Miller if (sin6) { 1363db8dac20SDavid S. Miller if (addr_len < offsetof(struct sockaddr, sa_data)) 1364db8dac20SDavid S. Miller return -EINVAL; 1365db8dac20SDavid S. Miller 1366db8dac20SDavid S. Miller switch (sin6->sin6_family) { 1367db8dac20SDavid S. Miller case AF_INET6: 1368db8dac20SDavid S. Miller if (addr_len < SIN6_LEN_RFC2133) 1369db8dac20SDavid S. Miller return -EINVAL; 1370db8dac20SDavid S. Miller daddr = &sin6->sin6_addr; 1371052d2369SJonathan T. Leighton if (ipv6_addr_any(daddr) && 1372052d2369SJonathan T. Leighton ipv6_addr_v4mapped(&np->saddr)) 1373052d2369SJonathan T. Leighton ipv6_addr_set_v4mapped(htonl(INADDR_LOOPBACK), 1374052d2369SJonathan T. Leighton daddr); 1375db8dac20SDavid S. Miller break; 1376db8dac20SDavid S. Miller case AF_INET: 1377db8dac20SDavid S. Miller goto do_udp_sendmsg; 1378db8dac20SDavid S. Miller case AF_UNSPEC: 1379db8dac20SDavid S. Miller msg->msg_name = sin6 = NULL; 1380db8dac20SDavid S. Miller msg->msg_namelen = addr_len = 0; 1381db8dac20SDavid S. Miller daddr = NULL; 1382db8dac20SDavid S. Miller break; 1383db8dac20SDavid S. Miller default: 1384db8dac20SDavid S. Miller return -EINVAL; 1385db8dac20SDavid S. Miller } 1386db8dac20SDavid S. Miller } else if (!up->pending) { 1387db8dac20SDavid S. Miller if (sk->sk_state != TCP_ESTABLISHED) 1388db8dac20SDavid S. Miller return -EDESTADDRREQ; 1389efe4208fSEric Dumazet daddr = &sk->sk_v6_daddr; 1390db8dac20SDavid S. Miller } else 1391db8dac20SDavid S. Miller daddr = NULL; 1392db8dac20SDavid S. Miller 1393db8dac20SDavid S. Miller if (daddr) { 1394db8dac20SDavid S. Miller if (ipv6_addr_v4mapped(daddr)) { 1395db8dac20SDavid S. Miller struct sockaddr_in sin; 1396db8dac20SDavid S. Miller sin.sin_family = AF_INET; 1397c720c7e8SEric Dumazet sin.sin_port = sin6 ? sin6->sin6_port : inet->inet_dport; 1398db8dac20SDavid S. Miller sin.sin_addr.s_addr = daddr->s6_addr32[3]; 1399db8dac20SDavid S. Miller msg->msg_name = &sin; 1400db8dac20SDavid S. Miller msg->msg_namelen = sizeof(sin); 1401db8dac20SDavid S. Miller do_udp_sendmsg: 14021c5950fcSEric Dumazet err = ipv6_only_sock(sk) ? 14031c5950fcSEric Dumazet -ENETUNREACH : udp_sendmsg(sk, msg, len); 14041c5950fcSEric Dumazet msg->msg_name = sin6; 14051c5950fcSEric Dumazet msg->msg_namelen = addr_len; 14061c5950fcSEric Dumazet return err; 1407db8dac20SDavid S. Miller } 1408db8dac20SDavid S. Miller } 1409db8dac20SDavid S. Miller 1410db8dac20SDavid S. Miller /* Rough check on arithmetic overflow, 1411db8dac20SDavid S. Miller better check is made in ip6_append_data(). 1412db8dac20SDavid S. Miller */ 1413db8dac20SDavid S. Miller if (len > INT_MAX - sizeof(struct udphdr)) 1414db8dac20SDavid S. Miller return -EMSGSIZE; 1415db8dac20SDavid S. Miller 141603485f2aSVlad Yasevich getfrag = is_udplite ? udplite_getfrag : ip_generic_getfrag; 1417db8dac20SDavid S. Miller if (up->pending) { 1418406c4a0aSPavel Begunkov if (up->pending == AF_INET) 1419406c4a0aSPavel Begunkov return udp_sendmsg(sk, msg, len); 1420db8dac20SDavid S. Miller /* 1421db8dac20SDavid S. Miller * There are pending frames. 1422db8dac20SDavid S. Miller * The socket lock must be held while it's corked. 1423db8dac20SDavid S. Miller */ 1424db8dac20SDavid S. Miller lock_sock(sk); 1425db8dac20SDavid S. Miller if (likely(up->pending)) { 1426db8dac20SDavid S. Miller if (unlikely(up->pending != AF_INET6)) { 1427db8dac20SDavid S. Miller release_sock(sk); 1428db8dac20SDavid S. Miller return -EAFNOSUPPORT; 1429db8dac20SDavid S. Miller } 1430db8dac20SDavid S. Miller dst = NULL; 1431db8dac20SDavid S. Miller goto do_append_data; 1432db8dac20SDavid S. Miller } 1433db8dac20SDavid S. Miller release_sock(sk); 1434db8dac20SDavid S. Miller } 1435db8dac20SDavid S. Miller ulen += sizeof(struct udphdr); 1436db8dac20SDavid S. Miller 14375298953eSPavel Begunkov memset(fl6, 0, sizeof(*fl6)); 1438db8dac20SDavid S. Miller 1439db8dac20SDavid S. Miller if (sin6) { 1440db8dac20SDavid S. Miller if (sin6->sin6_port == 0) 1441db8dac20SDavid S. Miller return -EINVAL; 1442db8dac20SDavid S. Miller 14435298953eSPavel Begunkov fl6->fl6_dport = sin6->sin6_port; 1444db8dac20SDavid S. Miller daddr = &sin6->sin6_addr; 1445db8dac20SDavid S. Miller 1446db8dac20SDavid S. Miller if (np->sndflow) { 14475298953eSPavel Begunkov fl6->flowlabel = sin6->sin6_flowinfo&IPV6_FLOWINFO_MASK; 14485298953eSPavel Begunkov if (fl6->flowlabel & IPV6_FLOWLABEL_MASK) { 14495298953eSPavel Begunkov flowlabel = fl6_sock_lookup(sk, fl6->flowlabel); 145059c820b2SWillem de Bruijn if (IS_ERR(flowlabel)) 1451db8dac20SDavid S. Miller return -EINVAL; 1452db8dac20SDavid S. Miller } 1453db8dac20SDavid S. Miller } 1454db8dac20SDavid S. Miller 1455db8dac20SDavid S. Miller /* 1456db8dac20SDavid S. Miller * Otherwise it will be difficult to maintain 1457db8dac20SDavid S. Miller * sk->sk_dst_cache. 1458db8dac20SDavid S. Miller */ 1459db8dac20SDavid S. Miller if (sk->sk_state == TCP_ESTABLISHED && 1460efe4208fSEric Dumazet ipv6_addr_equal(daddr, &sk->sk_v6_daddr)) 1461efe4208fSEric Dumazet daddr = &sk->sk_v6_daddr; 1462db8dac20SDavid S. Miller 1463db8dac20SDavid S. Miller if (addr_len >= sizeof(struct sockaddr_in6) && 1464db8dac20SDavid S. Miller sin6->sin6_scope_id && 1465842df073SHannes Frederic Sowa __ipv6_addr_needs_scope_id(__ipv6_addr_type(daddr))) 14665298953eSPavel Begunkov fl6->flowi6_oif = sin6->sin6_scope_id; 1467db8dac20SDavid S. Miller } else { 1468db8dac20SDavid S. Miller if (sk->sk_state != TCP_ESTABLISHED) 1469db8dac20SDavid S. Miller return -EDESTADDRREQ; 1470db8dac20SDavid S. Miller 14715298953eSPavel Begunkov fl6->fl6_dport = inet->inet_dport; 1472efe4208fSEric Dumazet daddr = &sk->sk_v6_daddr; 14735298953eSPavel Begunkov fl6->flowlabel = np->flow_label; 14749f542f61SAlexey Kodanev connected = true; 1475db8dac20SDavid S. Miller } 1476db8dac20SDavid S. Miller 14775298953eSPavel Begunkov if (!fl6->flowi6_oif) 14784c971d2fSEric Dumazet fl6->flowi6_oif = READ_ONCE(sk->sk_bound_dev_if); 1479db8dac20SDavid S. Miller 14805298953eSPavel Begunkov if (!fl6->flowi6_oif) 14815298953eSPavel Begunkov fl6->flowi6_oif = np->sticky_pktinfo.ipi6_ifindex; 14829f690db7SYang Hongyang 14835298953eSPavel Begunkov fl6->flowi6_uid = sk->sk_uid; 148451953d5bSBrian Haley 1485db8dac20SDavid S. Miller if (msg->msg_controllen) { 1486db8dac20SDavid S. Miller opt = &opt_space; 1487db8dac20SDavid S. Miller memset(opt, 0, sizeof(struct ipv6_txoptions)); 1488db8dac20SDavid S. Miller opt->tot_len = sizeof(*opt); 148926879da5SWei Wang ipc6.opt = opt; 1490db8dac20SDavid S. Miller 14912e8de857SWillem de Bruijn err = udp_cmsg_send(sk, msg, &ipc6.gso_size); 14922e8de857SWillem de Bruijn if (err > 0) 14935298953eSPavel Begunkov err = ip6_datagram_send_ctl(sock_net(sk), sk, msg, fl6, 14945fdaa88dSWillem de Bruijn &ipc6); 1495db8dac20SDavid S. Miller if (err < 0) { 1496db8dac20SDavid S. Miller fl6_sock_release(flowlabel); 1497db8dac20SDavid S. Miller return err; 1498db8dac20SDavid S. Miller } 14995298953eSPavel Begunkov if ((fl6->flowlabel&IPV6_FLOWLABEL_MASK) && !flowlabel) { 15005298953eSPavel Begunkov flowlabel = fl6_sock_lookup(sk, fl6->flowlabel); 150159c820b2SWillem de Bruijn if (IS_ERR(flowlabel)) 1502db8dac20SDavid S. Miller return -EINVAL; 1503db8dac20SDavid S. Miller } 1504db8dac20SDavid S. Miller if (!(opt->opt_nflen|opt->opt_flen)) 1505db8dac20SDavid S. Miller opt = NULL; 15069f542f61SAlexey Kodanev connected = false; 1507db8dac20SDavid S. Miller } 150845f6fad8SEric Dumazet if (!opt) { 150945f6fad8SEric Dumazet opt = txopt_get(np); 151045f6fad8SEric Dumazet opt_to_free = opt; 151145f6fad8SEric Dumazet } 1512db8dac20SDavid S. Miller if (flowlabel) 1513db8dac20SDavid S. Miller opt = fl6_merge_options(&opt_space, flowlabel, opt); 1514db8dac20SDavid S. Miller opt = ipv6_fixup_options(&opt_space, opt); 151526879da5SWei Wang ipc6.opt = opt; 1516db8dac20SDavid S. Miller 15175298953eSPavel Begunkov fl6->flowi6_proto = sk->sk_protocol; 15185298953eSPavel Begunkov fl6->flowi6_mark = ipc6.sockc.mark; 15195298953eSPavel Begunkov fl6->daddr = *daddr; 15205298953eSPavel Begunkov if (ipv6_addr_any(&fl6->saddr) && !ipv6_addr_any(&np->saddr)) 15215298953eSPavel Begunkov fl6->saddr = np->saddr; 15225298953eSPavel Begunkov fl6->fl6_sport = inet->inet_sport; 1523db8dac20SDavid S. Miller 15246fc88c35SDave Marchevsky if (cgroup_bpf_enabled(CGROUP_UDP6_SENDMSG) && !connected) { 15251cedee13SAndrey Ignatov err = BPF_CGROUP_RUN_PROG_UDP6_SENDMSG_LOCK(sk, 15265298953eSPavel Begunkov (struct sockaddr *)sin6, 15275298953eSPavel Begunkov &fl6->saddr); 15281cedee13SAndrey Ignatov if (err) 15291cedee13SAndrey Ignatov goto out_no_dst; 15301cedee13SAndrey Ignatov if (sin6) { 15311cedee13SAndrey Ignatov if (ipv6_addr_v4mapped(&sin6->sin6_addr)) { 15321cedee13SAndrey Ignatov /* BPF program rewrote IPv6-only by IPv4-mapped 15331cedee13SAndrey Ignatov * IPv6. It's currently unsupported. 15341cedee13SAndrey Ignatov */ 15351cedee13SAndrey Ignatov err = -ENOTSUPP; 15361cedee13SAndrey Ignatov goto out_no_dst; 15371cedee13SAndrey Ignatov } 15381cedee13SAndrey Ignatov if (sin6->sin6_port == 0) { 15391cedee13SAndrey Ignatov /* BPF program set invalid port. Reject it. */ 15401cedee13SAndrey Ignatov err = -EINVAL; 15411cedee13SAndrey Ignatov goto out_no_dst; 15421cedee13SAndrey Ignatov } 15435298953eSPavel Begunkov fl6->fl6_dport = sin6->sin6_port; 15445298953eSPavel Begunkov fl6->daddr = sin6->sin6_addr; 15451cedee13SAndrey Ignatov } 15461cedee13SAndrey Ignatov } 15471cedee13SAndrey Ignatov 15485298953eSPavel Begunkov if (ipv6_addr_any(&fl6->daddr)) 15495298953eSPavel Begunkov fl6->daddr.s6_addr[15] = 0x1; /* :: means loopback (BSD'ism) */ 1550e8e36984SAndrey Ignatov 15515298953eSPavel Begunkov final_p = fl6_update_dst(fl6, opt, &final); 155220c59de2SArnaud Ebalard if (final_p) 15539f542f61SAlexey Kodanev connected = false; 1554db8dac20SDavid S. Miller 15555298953eSPavel Begunkov if (!fl6->flowi6_oif && ipv6_addr_is_multicast(&fl6->daddr)) { 15565298953eSPavel Begunkov fl6->flowi6_oif = np->mcast_oif; 15579f542f61SAlexey Kodanev connected = false; 15585298953eSPavel Begunkov } else if (!fl6->flowi6_oif) 15595298953eSPavel Begunkov fl6->flowi6_oif = np->ucast_oif; 1560db8dac20SDavid S. Miller 15615298953eSPavel Begunkov security_sk_classify_flow(sk, flowi6_to_flowi_common(fl6)); 1562db8dac20SDavid S. Miller 156338b7097bSHannes Frederic Sowa if (ipc6.tclass < 0) 156438b7097bSHannes Frederic Sowa ipc6.tclass = np->tclass; 156538b7097bSHannes Frederic Sowa 15665298953eSPavel Begunkov fl6->flowlabel = ip6_make_flowinfo(ipc6.tclass, fl6->flowlabel); 156738b7097bSHannes Frederic Sowa 15685298953eSPavel Begunkov dst = ip6_sk_dst_lookup_flow(sk, fl6, final_p, connected); 156968d0c6d3SDavid S. Miller if (IS_ERR(dst)) { 157068d0c6d3SDavid S. Miller err = PTR_ERR(dst); 157168d0c6d3SDavid S. Miller dst = NULL; 1572db8dac20SDavid S. Miller goto out; 1573db8dac20SDavid S. Miller } 1574db8dac20SDavid S. Miller 157526879da5SWei Wang if (ipc6.hlimit < 0) 15765298953eSPavel Begunkov ipc6.hlimit = ip6_sk_dst_hoplimit(np, fl6, dst); 1577db8dac20SDavid S. Miller 1578db8dac20SDavid S. Miller if (msg->msg_flags&MSG_CONFIRM) 1579db8dac20SDavid S. Miller goto do_confirm; 1580db8dac20SDavid S. Miller back_from_confirm: 1581db8dac20SDavid S. Miller 158203485f2aSVlad Yasevich /* Lockless fast path for the non-corking case */ 158303485f2aSVlad Yasevich if (!corkreq) { 158403485f2aSVlad Yasevich struct sk_buff *skb; 158503485f2aSVlad Yasevich 158603485f2aSVlad Yasevich skb = ip6_make_skb(sk, getfrag, msg, ulen, 158726879da5SWei Wang sizeof(struct udphdr), &ipc6, 1588f37a4cc6SPavel Begunkov (struct rt6_info *)dst, 15895fdaa88dSWillem de Bruijn msg->msg_flags, &cork); 159003485f2aSVlad Yasevich err = PTR_ERR(skb); 159103485f2aSVlad Yasevich if (!IS_ERR_OR_NULL(skb)) 15925298953eSPavel Begunkov err = udp_v6_send_skb(skb, fl6, &cork.base); 159340ac240cSPavel Begunkov /* ip6_make_skb steals dst reference */ 159440ac240cSPavel Begunkov goto out_no_dst; 159503485f2aSVlad Yasevich } 159603485f2aSVlad Yasevich 1597db8dac20SDavid S. Miller lock_sock(sk); 1598db8dac20SDavid S. Miller if (unlikely(up->pending)) { 1599db8dac20SDavid S. Miller /* The socket is already corked while preparing it. */ 1600db8dac20SDavid S. Miller /* ... which is an evident application bug. --ANK */ 1601db8dac20SDavid S. Miller release_sock(sk); 1602db8dac20SDavid S. Miller 1603ba7a46f1SJoe Perches net_dbg_ratelimited("udp cork app bug 2\n"); 1604db8dac20SDavid S. Miller err = -EINVAL; 1605db8dac20SDavid S. Miller goto out; 1606db8dac20SDavid S. Miller } 1607db8dac20SDavid S. Miller 1608db8dac20SDavid S. Miller up->pending = AF_INET6; 1609db8dac20SDavid S. Miller 1610db8dac20SDavid S. Miller do_append_data: 161126879da5SWei Wang if (ipc6.dontfrag < 0) 161226879da5SWei Wang ipc6.dontfrag = np->dontfrag; 1613db8dac20SDavid S. Miller up->len += ulen; 161426879da5SWei Wang err = ip6_append_data(sk, getfrag, msg, ulen, sizeof(struct udphdr), 16155298953eSPavel Begunkov &ipc6, fl6, (struct rt6_info *)dst, 16165fdaa88dSWillem de Bruijn corkreq ? msg->msg_flags|MSG_MORE : msg->msg_flags); 1617db8dac20SDavid S. Miller if (err) 1618db8dac20SDavid S. Miller udp_v6_flush_pending_frames(sk); 1619db8dac20SDavid S. Miller else if (!corkreq) 1620db8dac20SDavid S. Miller err = udp_v6_push_pending_frames(sk); 1621db8dac20SDavid S. Miller else if (unlikely(skb_queue_empty(&sk->sk_write_queue))) 1622db8dac20SDavid S. Miller up->pending = 0; 1623db8dac20SDavid S. Miller 162403485f2aSVlad Yasevich if (err > 0) 162503485f2aSVlad Yasevich err = np->recverr ? net_xmit_errno(err) : 0; 162603485f2aSVlad Yasevich release_sock(sk); 162703485f2aSVlad Yasevich 1628db8dac20SDavid S. Miller out: 1629a3c96089SYOSHIFUJI Hideaki dst_release(dst); 16301cedee13SAndrey Ignatov out_no_dst: 1631db8dac20SDavid S. Miller fl6_sock_release(flowlabel); 163245f6fad8SEric Dumazet txopt_put(opt_to_free); 1633db8dac20SDavid S. Miller if (!err) 1634db8dac20SDavid S. Miller return len; 1635db8dac20SDavid S. Miller /* 1636db8dac20SDavid S. Miller * ENOBUFS = no kernel mem, SOCK_NOSPACE = no sndbuf space. Reporting 1637db8dac20SDavid S. Miller * ENOBUFS might not be good (it's not tunable per se), but otherwise 1638db8dac20SDavid S. Miller * we don't have a good statistic (IpOutDiscards but it can be too many 1639db8dac20SDavid S. Miller * things). We could add another new stat but at least for now that 1640db8dac20SDavid S. Miller * seems like overkill. 1641db8dac20SDavid S. Miller */ 1642db8dac20SDavid S. Miller if (err == -ENOBUFS || test_bit(SOCK_NOSPACE, &sk->sk_socket->flags)) { 16436aef70a8SEric Dumazet UDP6_INC_STATS(sock_net(sk), 1644235b9f7aSPavel Emelyanov UDP_MIB_SNDBUFERRORS, is_udplite); 1645db8dac20SDavid S. Miller } 1646db8dac20SDavid S. Miller return err; 1647db8dac20SDavid S. Miller 1648db8dac20SDavid S. Miller do_confirm: 16490dec879fSJulian Anastasov if (msg->msg_flags & MSG_PROBE) 16505298953eSPavel Begunkov dst_confirm_neigh(dst, &fl6->daddr); 1651db8dac20SDavid S. Miller if (!(msg->msg_flags&MSG_PROBE) || len) 1652db8dac20SDavid S. Miller goto back_from_confirm; 1653db8dac20SDavid S. Miller err = 0; 1654db8dac20SDavid S. Miller goto out; 1655db8dac20SDavid S. Miller } 1656ed472b0cSDavid Howells EXPORT_SYMBOL(udpv6_sendmsg); 1657db8dac20SDavid S. Miller 16581d7e4538SDavid Howells static void udpv6_splice_eof(struct socket *sock) 16591d7e4538SDavid Howells { 16601d7e4538SDavid Howells struct sock *sk = sock->sk; 16611d7e4538SDavid Howells struct udp_sock *up = udp_sk(sk); 16621d7e4538SDavid Howells 16631d7e4538SDavid Howells if (!up->pending || READ_ONCE(up->corkflag)) 16641d7e4538SDavid Howells return; 16651d7e4538SDavid Howells 16661d7e4538SDavid Howells lock_sock(sk); 16671d7e4538SDavid Howells if (up->pending && !READ_ONCE(up->corkflag)) 16681d7e4538SDavid Howells udp_v6_push_pending_frames(sk); 16691d7e4538SDavid Howells release_sock(sk); 16701d7e4538SDavid Howells } 16711d7e4538SDavid Howells 16727d06b2e0SBrian Haley void udpv6_destroy_sock(struct sock *sk) 1673db8dac20SDavid S. Miller { 167444046a59STom Parkin struct udp_sock *up = udp_sk(sk); 1675db8dac20SDavid S. Miller lock_sock(sk); 1676a8b897c7SPaolo Abeni 1677a8b897c7SPaolo Abeni /* protects from races with udp_abort() */ 1678a8b897c7SPaolo Abeni sock_set_flag(sk, SOCK_DEAD); 1679db8dac20SDavid S. Miller udp_v6_flush_pending_frames(sk); 1680db8dac20SDavid S. Miller release_sock(sk); 1681db8dac20SDavid S. Miller 168260fb9567SPaolo Abeni if (static_branch_unlikely(&udpv6_encap_needed_key)) { 168360fb9567SPaolo Abeni if (up->encap_type) { 168444046a59STom Parkin void (*encap_destroy)(struct sock *sk); 16856aa7de05SMark Rutland encap_destroy = READ_ONCE(up->encap_destroy); 168644046a59STom Parkin if (encap_destroy) 168744046a59STom Parkin encap_destroy(sk); 168844046a59STom Parkin } 1689a4a600ddSXin Long if (up->encap_enabled) { 16909c480601SPaolo Abeni static_branch_dec(&udpv6_encap_needed_key); 1691a4a600ddSXin Long udp_encap_disable(); 1692a4a600ddSXin Long } 169360fb9567SPaolo Abeni } 1694db8dac20SDavid S. Miller } 1695db8dac20SDavid S. Miller 1696db8dac20SDavid S. Miller /* 1697db8dac20SDavid S. Miller * Socket option code for UDP 1698db8dac20SDavid S. Miller */ 1699a7b75c5aSChristoph Hellwig int udpv6_setsockopt(struct sock *sk, int level, int optname, sockptr_t optval, 1700a7b75c5aSChristoph Hellwig unsigned int optlen) 1701db8dac20SDavid S. Miller { 17028a3854c7SPaolo Abeni if (level == SOL_UDP || level == SOL_UDPLITE || level == SOL_SOCKET) 170391ac1ccaSChristoph Hellwig return udp_lib_setsockopt(sk, level, optname, 1704a7b75c5aSChristoph Hellwig optval, optlen, 1705db8dac20SDavid S. Miller udp_v6_push_pending_frames); 1706db8dac20SDavid S. Miller return ipv6_setsockopt(sk, level, optname, optval, optlen); 1707db8dac20SDavid S. Miller } 1708db8dac20SDavid S. Miller 1709db8dac20SDavid S. Miller int udpv6_getsockopt(struct sock *sk, int level, int optname, 1710db8dac20SDavid S. Miller char __user *optval, int __user *optlen) 1711db8dac20SDavid S. Miller { 1712db8dac20SDavid S. Miller if (level == SOL_UDP || level == SOL_UDPLITE) 1713db8dac20SDavid S. Miller return udp_lib_getsockopt(sk, level, optname, optval, optlen); 1714db8dac20SDavid S. Miller return ipv6_getsockopt(sk, level, optname, optval, optlen); 1715db8dac20SDavid S. Miller } 1716db8dac20SDavid S. Miller 171711052589SKuniyuki Iwashima static const struct inet6_protocol udpv6_protocol = { 1718db8dac20SDavid S. Miller .handler = udpv6_rcv, 1719db8dac20SDavid S. Miller .err_handler = udpv6_err, 1720db8dac20SDavid S. Miller .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL, 1721db8dac20SDavid S. Miller }; 1722db8dac20SDavid S. Miller 1723db8dac20SDavid S. Miller /* ------------------------------------------------------------------------ */ 1724db8dac20SDavid S. Miller #ifdef CONFIG_PROC_FS 1725db8dac20SDavid S. Miller int udp6_seq_show(struct seq_file *seq, void *v) 1726db8dac20SDavid S. Miller { 172717ef66afSLorenzo Colitti if (v == SEQ_START_TOKEN) { 172817ef66afSLorenzo Colitti seq_puts(seq, IPV6_SEQ_DGRAM_HEADER); 172917ef66afSLorenzo Colitti } else { 173017ef66afSLorenzo Colitti int bucket = ((struct udp_iter_state *)seq->private)->bucket; 1731abc17a11SEric Dumazet const struct inet_sock *inet = inet_sk((const struct sock *)v); 173217ef66afSLorenzo Colitti __u16 srcp = ntohs(inet->inet_sport); 173317ef66afSLorenzo Colitti __u16 destp = ntohs(inet->inet_dport); 17346c206b20SPaolo Abeni __ip6_dgram_sock_seq_show(seq, v, srcp, destp, 17356c206b20SPaolo Abeni udp_rqueue_get(v), bucket); 173617ef66afSLorenzo Colitti } 1737db8dac20SDavid S. Miller return 0; 1738db8dac20SDavid S. Miller } 1739db8dac20SDavid S. Miller 1740c3506372SChristoph Hellwig const struct seq_operations udp6_seq_ops = { 1741a3d2599bSChristoph Hellwig .start = udp_seq_start, 1742a3d2599bSChristoph Hellwig .next = udp_seq_next, 1743a3d2599bSChristoph Hellwig .stop = udp_seq_stop, 1744a3d2599bSChristoph Hellwig .show = udp6_seq_show, 1745a3d2599bSChristoph Hellwig }; 1746c3506372SChristoph Hellwig EXPORT_SYMBOL(udp6_seq_ops); 174773cb88ecSArjan van de Ven 1748db8dac20SDavid S. Miller static struct udp_seq_afinfo udp6_seq_afinfo = { 1749db8dac20SDavid S. Miller .family = AF_INET6, 1750478aee5dSKuniyuki Iwashima .udp_table = NULL, 1751db8dac20SDavid S. Miller }; 1752db8dac20SDavid S. Miller 17532c8c1e72SAlexey Dobriyan int __net_init udp6_proc_init(struct net *net) 1754db8dac20SDavid S. Miller { 1755c3506372SChristoph Hellwig if (!proc_create_net_data("udp6", 0444, net->proc_net, &udp6_seq_ops, 1756c3506372SChristoph Hellwig sizeof(struct udp_iter_state), &udp6_seq_afinfo)) 1757a3d2599bSChristoph Hellwig return -ENOMEM; 1758a3d2599bSChristoph Hellwig return 0; 1759db8dac20SDavid S. Miller } 1760db8dac20SDavid S. Miller 1761ec120da6SIan Morris void udp6_proc_exit(struct net *net) 1762ec120da6SIan Morris { 1763a3d2599bSChristoph Hellwig remove_proc_entry("udp6", net->proc_net); 1764db8dac20SDavid S. Miller } 1765db8dac20SDavid S. Miller #endif /* CONFIG_PROC_FS */ 1766db8dac20SDavid S. Miller 1767db8dac20SDavid S. Miller /* ------------------------------------------------------------------------ */ 1768db8dac20SDavid S. Miller 1769db8dac20SDavid S. Miller struct proto udpv6_prot = { 1770db8dac20SDavid S. Miller .name = "UDPv6", 1771db8dac20SDavid S. Miller .owner = THIS_MODULE, 1772db8dac20SDavid S. Miller .close = udp_lib_close, 1773d74bad4eSAndrey Ignatov .pre_connect = udpv6_pre_connect, 1774db8dac20SDavid S. Miller .connect = ip6_datagram_connect, 1775db8dac20SDavid S. Miller .disconnect = udp_disconnect, 1776db8dac20SDavid S. Miller .ioctl = udp_ioctl, 1777d38afeecSKuniyuki Iwashima .init = udpv6_init_sock, 1778db8dac20SDavid S. Miller .destroy = udpv6_destroy_sock, 1779db8dac20SDavid S. Miller .setsockopt = udpv6_setsockopt, 1780db8dac20SDavid S. Miller .getsockopt = udpv6_getsockopt, 1781db8dac20SDavid S. Miller .sendmsg = udpv6_sendmsg, 1782db8dac20SDavid S. Miller .recvmsg = udpv6_recvmsg, 17831d7e4538SDavid Howells .splice_eof = udpv6_splice_eof, 1784e646b657SMartin KaFai Lau .release_cb = ip6_datagram_release_cb, 1785db8dac20SDavid S. Miller .hash = udp_lib_hash, 1786db8dac20SDavid S. Miller .unhash = udp_lib_unhash, 1787719f8358SEric Dumazet .rehash = udp_v6_rehash, 1788db8dac20SDavid S. Miller .get_port = udp_v6_get_port, 178991a760b2SMenglong Dong .put_port = udp_lib_unhash, 17908a59f9d1SCong Wang #ifdef CONFIG_BPF_SYSCALL 17918a59f9d1SCong Wang .psock_update_sk_prot = udp_bpf_update_proto, 17928a59f9d1SCong Wang #endif 17930defbb0aSEric Dumazet 1794db8dac20SDavid S. Miller .memory_allocated = &udp_memory_allocated, 17950defbb0aSEric Dumazet .per_cpu_fw_alloc = &udp_memory_per_cpu_fw_alloc, 17960defbb0aSEric Dumazet 1797db8dac20SDavid S. Miller .sysctl_mem = sysctl_udp_mem, 17981e802951STonghao Zhang .sysctl_wmem_offset = offsetof(struct net, ipv4.sysctl_udp_wmem_min), 17991e802951STonghao Zhang .sysctl_rmem_offset = offsetof(struct net, ipv4.sysctl_udp_rmem_min), 1800db8dac20SDavid S. Miller .obj_size = sizeof(struct udp6_sock), 180167fb4330SKuniyuki Iwashima .h.udp_table = NULL, 18025d77dca8SDavid Ahern .diag_destroy = udp_abort, 1803db8dac20SDavid S. Miller }; 1804db8dac20SDavid S. Miller 1805db8dac20SDavid S. Miller static struct inet_protosw udpv6_protosw = { 1806db8dac20SDavid S. Miller .type = SOCK_DGRAM, 1807db8dac20SDavid S. Miller .protocol = IPPROTO_UDP, 1808db8dac20SDavid S. Miller .prot = &udpv6_prot, 1809db8dac20SDavid S. Miller .ops = &inet6_dgram_ops, 1810db8dac20SDavid S. Miller .flags = INET_PROTOSW_PERMANENT, 1811db8dac20SDavid S. Miller }; 1812db8dac20SDavid S. Miller 1813db8dac20SDavid S. Miller int __init udpv6_init(void) 1814db8dac20SDavid S. Miller { 1815db8dac20SDavid S. Miller int ret; 1816db8dac20SDavid S. Miller 18173336288aSVlad Yasevich ret = inet6_add_protocol(&udpv6_protocol, IPPROTO_UDP); 18183336288aSVlad Yasevich if (ret) 1819c6b641a4SVlad Yasevich goto out; 18203336288aSVlad Yasevich 1821db8dac20SDavid S. Miller ret = inet6_register_protosw(&udpv6_protosw); 1822db8dac20SDavid S. Miller if (ret) 1823db8dac20SDavid S. Miller goto out_udpv6_protocol; 1824db8dac20SDavid S. Miller out: 1825db8dac20SDavid S. Miller return ret; 1826db8dac20SDavid S. Miller 1827db8dac20SDavid S. Miller out_udpv6_protocol: 1828db8dac20SDavid S. Miller inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP); 1829db8dac20SDavid S. Miller goto out; 1830db8dac20SDavid S. Miller } 1831db8dac20SDavid S. Miller 1832db8dac20SDavid S. Miller void udpv6_exit(void) 1833db8dac20SDavid S. Miller { 1834db8dac20SDavid S. Miller inet6_unregister_protosw(&udpv6_protosw); 1835db8dac20SDavid S. Miller inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP); 1836db8dac20SDavid S. Miller } 1837