1db8dac20SDavid S. Miller /* 2db8dac20SDavid S. Miller * UDP over IPv6 3db8dac20SDavid S. Miller * Linux INET6 implementation 4db8dac20SDavid S. Miller * 5db8dac20SDavid S. Miller * Authors: 6db8dac20SDavid S. Miller * Pedro Roque <roque@di.fc.ul.pt> 7db8dac20SDavid S. Miller * 8db8dac20SDavid S. Miller * Based on linux/ipv4/udp.c 9db8dac20SDavid S. Miller * 10db8dac20SDavid S. Miller * Fixes: 11db8dac20SDavid S. Miller * Hideaki YOSHIFUJI : sin6_scope_id support 12db8dac20SDavid S. Miller * YOSHIFUJI Hideaki @USAGI and: Support IPV6_V6ONLY socket option, which 13db8dac20SDavid S. Miller * Alexey Kuznetsov allow both IPv4 and IPv6 sockets to bind 14db8dac20SDavid S. Miller * a single port at the same time. 15db8dac20SDavid S. Miller * Kazunori MIYAZAWA @USAGI: change process style to use ip6_append_data 16db8dac20SDavid S. Miller * YOSHIFUJI Hideaki @USAGI: convert /proc/net/udp6 to seq_file. 17db8dac20SDavid S. Miller * 18db8dac20SDavid S. Miller * This program is free software; you can redistribute it and/or 19db8dac20SDavid S. Miller * modify it under the terms of the GNU General Public License 20db8dac20SDavid S. Miller * as published by the Free Software Foundation; either version 21db8dac20SDavid S. Miller * 2 of the License, or (at your option) any later version. 22db8dac20SDavid S. Miller */ 23db8dac20SDavid S. Miller 24db8dac20SDavid S. Miller #include <linux/errno.h> 25db8dac20SDavid S. Miller #include <linux/types.h> 26db8dac20SDavid S. Miller #include <linux/socket.h> 27db8dac20SDavid S. Miller #include <linux/sockios.h> 28db8dac20SDavid S. Miller #include <linux/net.h> 29db8dac20SDavid S. Miller #include <linux/in6.h> 30db8dac20SDavid S. Miller #include <linux/netdevice.h> 31db8dac20SDavid S. Miller #include <linux/if_arp.h> 32db8dac20SDavid S. Miller #include <linux/ipv6.h> 33db8dac20SDavid S. Miller #include <linux/icmpv6.h> 34db8dac20SDavid S. Miller #include <linux/init.h> 35db8dac20SDavid S. Miller #include <linux/module.h> 36db8dac20SDavid S. Miller #include <linux/skbuff.h> 37db8dac20SDavid S. Miller #include <asm/uaccess.h> 38db8dac20SDavid S. Miller 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> 44db8dac20SDavid S. Miller #include <net/tcp_states.h> 45db8dac20SDavid S. Miller #include <net/ip6_checksum.h> 46db8dac20SDavid S. Miller #include <net/xfrm.h> 47db8dac20SDavid S. Miller 48db8dac20SDavid S. Miller #include <linux/proc_fs.h> 49db8dac20SDavid S. Miller #include <linux/seq_file.h> 50db8dac20SDavid S. Miller #include "udp_impl.h" 51db8dac20SDavid S. Miller 526ba5a3c5SPavel Emelyanov int udp_v6_get_port(struct sock *sk, unsigned short snum) 53db8dac20SDavid S. Miller { 546ba5a3c5SPavel Emelyanov return udp_lib_get_port(sk, snum, ipv6_rcv_saddr_equal); 55db8dac20SDavid S. Miller } 56db8dac20SDavid S. Miller 57db8dac20SDavid S. Miller static struct sock *__udp6_lib_lookup(struct net *net, 58db8dac20SDavid S. Miller struct in6_addr *saddr, __be16 sport, 59db8dac20SDavid S. Miller struct in6_addr *daddr, __be16 dport, 60db8dac20SDavid S. Miller int dif, struct hlist_head udptable[]) 61db8dac20SDavid S. Miller { 62db8dac20SDavid S. Miller struct sock *sk, *result = NULL; 63db8dac20SDavid S. Miller struct hlist_node *node; 64db8dac20SDavid S. Miller unsigned short hnum = ntohs(dport); 65db8dac20SDavid S. Miller int badness = -1; 66db8dac20SDavid S. Miller 67db8dac20SDavid S. Miller read_lock(&udp_hash_lock); 6819c7578fSPavel Emelyanov sk_for_each(sk, node, &udptable[udp_hashfn(net, hnum)]) { 69db8dac20SDavid S. Miller struct inet_sock *inet = inet_sk(sk); 70db8dac20SDavid S. Miller 71878628fbSYOSHIFUJI Hideaki if (net_eq(sock_net(sk), net) && sk->sk_hash == hnum && 72db8dac20SDavid S. Miller sk->sk_family == PF_INET6) { 73db8dac20SDavid S. Miller struct ipv6_pinfo *np = inet6_sk(sk); 74db8dac20SDavid S. Miller int score = 0; 75db8dac20SDavid S. Miller if (inet->dport) { 76db8dac20SDavid S. Miller if (inet->dport != sport) 77db8dac20SDavid S. Miller continue; 78db8dac20SDavid S. Miller score++; 79db8dac20SDavid S. Miller } 80db8dac20SDavid S. Miller if (!ipv6_addr_any(&np->rcv_saddr)) { 81db8dac20SDavid S. Miller if (!ipv6_addr_equal(&np->rcv_saddr, daddr)) 82db8dac20SDavid S. Miller continue; 83db8dac20SDavid S. Miller score++; 84db8dac20SDavid S. Miller } 85db8dac20SDavid S. Miller if (!ipv6_addr_any(&np->daddr)) { 86db8dac20SDavid S. Miller if (!ipv6_addr_equal(&np->daddr, saddr)) 87db8dac20SDavid S. Miller continue; 88db8dac20SDavid S. Miller score++; 89db8dac20SDavid S. Miller } 90db8dac20SDavid S. Miller if (sk->sk_bound_dev_if) { 91db8dac20SDavid S. Miller if (sk->sk_bound_dev_if != dif) 92db8dac20SDavid S. Miller continue; 93db8dac20SDavid S. Miller score++; 94db8dac20SDavid S. Miller } 95db8dac20SDavid S. Miller if (score == 4) { 96db8dac20SDavid S. Miller result = sk; 97db8dac20SDavid S. Miller break; 98db8dac20SDavid S. Miller } else if (score > badness) { 99db8dac20SDavid S. Miller result = sk; 100db8dac20SDavid S. Miller badness = score; 101db8dac20SDavid S. Miller } 102db8dac20SDavid S. Miller } 103db8dac20SDavid S. Miller } 104db8dac20SDavid S. Miller if (result) 105db8dac20SDavid S. Miller sock_hold(result); 106db8dac20SDavid S. Miller read_unlock(&udp_hash_lock); 107db8dac20SDavid S. Miller return result; 108db8dac20SDavid S. Miller } 109db8dac20SDavid S. Miller 110db8dac20SDavid S. Miller /* 111db8dac20SDavid S. Miller * This should be easy, if there is something there we 112db8dac20SDavid S. Miller * return it, otherwise we block. 113db8dac20SDavid S. Miller */ 114db8dac20SDavid S. Miller 115db8dac20SDavid S. Miller int udpv6_recvmsg(struct kiocb *iocb, struct sock *sk, 116db8dac20SDavid S. Miller struct msghdr *msg, size_t len, 117db8dac20SDavid S. Miller int noblock, int flags, int *addr_len) 118db8dac20SDavid S. Miller { 119db8dac20SDavid S. Miller struct ipv6_pinfo *np = inet6_sk(sk); 120db8dac20SDavid S. Miller struct inet_sock *inet = inet_sk(sk); 121db8dac20SDavid S. Miller struct sk_buff *skb; 122db8dac20SDavid S. Miller unsigned int ulen, copied; 123db8dac20SDavid S. Miller int peeked; 124db8dac20SDavid S. Miller int err; 125db8dac20SDavid S. Miller int is_udplite = IS_UDPLITE(sk); 126db8dac20SDavid S. Miller 127db8dac20SDavid S. Miller if (addr_len) 128db8dac20SDavid S. Miller *addr_len=sizeof(struct sockaddr_in6); 129db8dac20SDavid S. Miller 130db8dac20SDavid S. Miller if (flags & MSG_ERRQUEUE) 131db8dac20SDavid S. Miller return ipv6_recv_error(sk, msg, len); 132db8dac20SDavid S. Miller 133db8dac20SDavid S. Miller try_again: 134db8dac20SDavid S. Miller skb = __skb_recv_datagram(sk, flags | (noblock ? MSG_DONTWAIT : 0), 135db8dac20SDavid S. Miller &peeked, &err); 136db8dac20SDavid S. Miller if (!skb) 137db8dac20SDavid S. Miller goto out; 138db8dac20SDavid S. Miller 139db8dac20SDavid S. Miller ulen = skb->len - sizeof(struct udphdr); 140db8dac20SDavid S. Miller copied = len; 141db8dac20SDavid S. Miller if (copied > ulen) 142db8dac20SDavid S. Miller copied = ulen; 143db8dac20SDavid S. Miller else if (copied < ulen) 144db8dac20SDavid S. Miller msg->msg_flags |= MSG_TRUNC; 145db8dac20SDavid S. Miller 146db8dac20SDavid S. Miller /* 147db8dac20SDavid S. Miller * If checksum is needed at all, try to do it while copying the 148db8dac20SDavid S. Miller * data. If the data is truncated, or if we only want a partial 149db8dac20SDavid S. Miller * coverage checksum (UDP-Lite), do it before the copy. 150db8dac20SDavid S. Miller */ 151db8dac20SDavid S. Miller 152db8dac20SDavid S. Miller if (copied < ulen || UDP_SKB_CB(skb)->partial_cov) { 153db8dac20SDavid S. Miller if (udp_lib_checksum_complete(skb)) 154db8dac20SDavid S. Miller goto csum_copy_err; 155db8dac20SDavid S. Miller } 156db8dac20SDavid S. Miller 157db8dac20SDavid S. Miller if (skb_csum_unnecessary(skb)) 158db8dac20SDavid S. Miller err = skb_copy_datagram_iovec(skb, sizeof(struct udphdr), 159db8dac20SDavid S. Miller msg->msg_iov, copied ); 160db8dac20SDavid S. Miller else { 161db8dac20SDavid S. Miller err = skb_copy_and_csum_datagram_iovec(skb, sizeof(struct udphdr), msg->msg_iov); 162db8dac20SDavid S. Miller if (err == -EINVAL) 163db8dac20SDavid S. Miller goto csum_copy_err; 164db8dac20SDavid S. Miller } 165db8dac20SDavid S. Miller if (err) 166db8dac20SDavid S. Miller goto out_free; 167db8dac20SDavid S. Miller 168db8dac20SDavid S. Miller if (!peeked) 169db8dac20SDavid S. Miller UDP6_INC_STATS_USER(UDP_MIB_INDATAGRAMS, is_udplite); 170db8dac20SDavid S. Miller 171db8dac20SDavid S. Miller sock_recv_timestamp(msg, sk, skb); 172db8dac20SDavid S. Miller 173db8dac20SDavid S. Miller /* Copy the address. */ 174db8dac20SDavid S. Miller if (msg->msg_name) { 175db8dac20SDavid S. Miller struct sockaddr_in6 *sin6; 176db8dac20SDavid S. Miller 177db8dac20SDavid S. Miller sin6 = (struct sockaddr_in6 *) msg->msg_name; 178db8dac20SDavid S. Miller sin6->sin6_family = AF_INET6; 179db8dac20SDavid S. Miller sin6->sin6_port = udp_hdr(skb)->source; 180db8dac20SDavid S. Miller sin6->sin6_flowinfo = 0; 181db8dac20SDavid S. Miller sin6->sin6_scope_id = 0; 182db8dac20SDavid S. Miller 183db8dac20SDavid S. Miller if (skb->protocol == htons(ETH_P_IP)) 184db8dac20SDavid S. Miller ipv6_addr_set(&sin6->sin6_addr, 0, 0, 185db8dac20SDavid S. Miller htonl(0xffff), ip_hdr(skb)->saddr); 186db8dac20SDavid S. Miller else { 187db8dac20SDavid S. Miller ipv6_addr_copy(&sin6->sin6_addr, 188db8dac20SDavid S. Miller &ipv6_hdr(skb)->saddr); 189db8dac20SDavid S. Miller if (ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL) 190db8dac20SDavid S. Miller sin6->sin6_scope_id = IP6CB(skb)->iif; 191db8dac20SDavid S. Miller } 192db8dac20SDavid S. Miller 193db8dac20SDavid S. Miller } 194db8dac20SDavid S. Miller if (skb->protocol == htons(ETH_P_IP)) { 195db8dac20SDavid S. Miller if (inet->cmsg_flags) 196db8dac20SDavid S. Miller ip_cmsg_recv(msg, skb); 197db8dac20SDavid S. Miller } else { 198db8dac20SDavid S. Miller if (np->rxopt.all) 199db8dac20SDavid S. Miller datagram_recv_ctl(sk, msg, skb); 200db8dac20SDavid S. Miller } 201db8dac20SDavid S. Miller 202db8dac20SDavid S. Miller err = copied; 203db8dac20SDavid S. Miller if (flags & MSG_TRUNC) 204db8dac20SDavid S. Miller err = ulen; 205db8dac20SDavid S. Miller 206db8dac20SDavid S. Miller out_free: 207db8dac20SDavid S. Miller lock_sock(sk); 208db8dac20SDavid S. Miller skb_free_datagram(sk, skb); 209db8dac20SDavid S. Miller release_sock(sk); 210db8dac20SDavid S. Miller out: 211db8dac20SDavid S. Miller return err; 212db8dac20SDavid S. Miller 213db8dac20SDavid S. Miller csum_copy_err: 214db8dac20SDavid S. Miller lock_sock(sk); 215db8dac20SDavid S. Miller if (!skb_kill_datagram(sk, skb, flags)) 216db8dac20SDavid S. Miller UDP6_INC_STATS_USER(UDP_MIB_INERRORS, is_udplite); 217db8dac20SDavid S. Miller release_sock(sk); 218db8dac20SDavid S. Miller 219db8dac20SDavid S. Miller if (flags & MSG_DONTWAIT) 220db8dac20SDavid S. Miller return -EAGAIN; 221db8dac20SDavid S. Miller goto try_again; 222db8dac20SDavid S. Miller } 223db8dac20SDavid S. Miller 224db8dac20SDavid S. Miller void __udp6_lib_err(struct sk_buff *skb, struct inet6_skb_parm *opt, 225db8dac20SDavid S. Miller int type, int code, int offset, __be32 info, 226db8dac20SDavid S. Miller struct hlist_head udptable[] ) 227db8dac20SDavid S. Miller { 228db8dac20SDavid S. Miller struct ipv6_pinfo *np; 229db8dac20SDavid S. Miller struct ipv6hdr *hdr = (struct ipv6hdr*)skb->data; 230db8dac20SDavid S. Miller struct in6_addr *saddr = &hdr->saddr; 231db8dac20SDavid S. Miller struct in6_addr *daddr = &hdr->daddr; 232db8dac20SDavid S. Miller struct udphdr *uh = (struct udphdr*)(skb->data+offset); 233db8dac20SDavid S. Miller struct sock *sk; 234db8dac20SDavid S. Miller int err; 235db8dac20SDavid S. Miller 236c346dca1SYOSHIFUJI Hideaki sk = __udp6_lib_lookup(dev_net(skb->dev), daddr, uh->dest, 237db8dac20SDavid S. Miller saddr, uh->source, inet6_iif(skb), udptable); 238db8dac20SDavid S. Miller if (sk == NULL) 239db8dac20SDavid S. Miller return; 240db8dac20SDavid S. Miller 241db8dac20SDavid S. Miller np = inet6_sk(sk); 242db8dac20SDavid S. Miller 243db8dac20SDavid S. Miller if (!icmpv6_err_convert(type, code, &err) && !np->recverr) 244db8dac20SDavid S. Miller goto out; 245db8dac20SDavid S. Miller 246db8dac20SDavid S. Miller if (sk->sk_state != TCP_ESTABLISHED && !np->recverr) 247db8dac20SDavid S. Miller goto out; 248db8dac20SDavid S. Miller 249db8dac20SDavid S. Miller if (np->recverr) 250db8dac20SDavid S. Miller ipv6_icmp_error(sk, skb, err, uh->dest, ntohl(info), (u8 *)(uh+1)); 251db8dac20SDavid S. Miller 252db8dac20SDavid S. Miller sk->sk_err = err; 253db8dac20SDavid S. Miller sk->sk_error_report(sk); 254db8dac20SDavid S. Miller out: 255db8dac20SDavid S. Miller sock_put(sk); 256db8dac20SDavid S. Miller } 257db8dac20SDavid S. Miller 258db8dac20SDavid S. Miller static __inline__ void udpv6_err(struct sk_buff *skb, 259db8dac20SDavid S. Miller struct inet6_skb_parm *opt, int type, 260db8dac20SDavid S. Miller int code, int offset, __be32 info ) 261db8dac20SDavid S. Miller { 262db8dac20SDavid S. Miller __udp6_lib_err(skb, opt, type, code, offset, info, udp_hash); 263db8dac20SDavid S. Miller } 264db8dac20SDavid S. Miller 265db8dac20SDavid S. Miller int udpv6_queue_rcv_skb(struct sock * sk, struct sk_buff *skb) 266db8dac20SDavid S. Miller { 267db8dac20SDavid S. Miller struct udp_sock *up = udp_sk(sk); 268db8dac20SDavid S. Miller int rc; 269db8dac20SDavid S. Miller int is_udplite = IS_UDPLITE(sk); 270db8dac20SDavid S. Miller 271db8dac20SDavid S. Miller if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb)) 272db8dac20SDavid S. Miller goto drop; 273db8dac20SDavid S. Miller 274db8dac20SDavid S. Miller /* 275db8dac20SDavid S. Miller * UDP-Lite specific tests, ignored on UDP sockets (see net/ipv4/udp.c). 276db8dac20SDavid S. Miller */ 277db8dac20SDavid S. Miller if ((is_udplite & UDPLITE_RECV_CC) && UDP_SKB_CB(skb)->partial_cov) { 278db8dac20SDavid S. Miller 279db8dac20SDavid S. Miller if (up->pcrlen == 0) { /* full coverage was set */ 280db8dac20SDavid S. Miller LIMIT_NETDEBUG(KERN_WARNING "UDPLITE6: partial coverage" 281db8dac20SDavid S. Miller " %d while full coverage %d requested\n", 282db8dac20SDavid S. Miller UDP_SKB_CB(skb)->cscov, skb->len); 283db8dac20SDavid S. Miller goto drop; 284db8dac20SDavid S. Miller } 285db8dac20SDavid S. Miller if (UDP_SKB_CB(skb)->cscov < up->pcrlen) { 286db8dac20SDavid S. Miller LIMIT_NETDEBUG(KERN_WARNING "UDPLITE6: coverage %d " 287db8dac20SDavid S. Miller "too small, need min %d\n", 288db8dac20SDavid S. Miller UDP_SKB_CB(skb)->cscov, up->pcrlen); 289db8dac20SDavid S. Miller goto drop; 290db8dac20SDavid S. Miller } 291db8dac20SDavid S. Miller } 292db8dac20SDavid S. Miller 293db8dac20SDavid S. Miller if (sk->sk_filter) { 294db8dac20SDavid S. Miller if (udp_lib_checksum_complete(skb)) 295db8dac20SDavid S. Miller goto drop; 296db8dac20SDavid S. Miller } 297db8dac20SDavid S. Miller 298db8dac20SDavid S. Miller if ((rc = sock_queue_rcv_skb(sk,skb)) < 0) { 299db8dac20SDavid S. Miller /* Note that an ENOMEM error is charged twice */ 300cb61cb9bSEric Dumazet if (rc == -ENOMEM) { 301db8dac20SDavid S. Miller UDP6_INC_STATS_BH(UDP_MIB_RCVBUFERRORS, is_udplite); 302cb61cb9bSEric Dumazet atomic_inc(&sk->sk_drops); 303cb61cb9bSEric Dumazet } 304db8dac20SDavid S. Miller goto drop; 305db8dac20SDavid S. Miller } 306db8dac20SDavid S. Miller 307db8dac20SDavid S. Miller return 0; 308db8dac20SDavid S. Miller drop: 309db8dac20SDavid S. Miller UDP6_INC_STATS_BH(UDP_MIB_INERRORS, is_udplite); 310db8dac20SDavid S. Miller kfree_skb(skb); 311db8dac20SDavid S. Miller return -1; 312db8dac20SDavid S. Miller } 313db8dac20SDavid S. Miller 314db8dac20SDavid S. Miller static struct sock *udp_v6_mcast_next(struct sock *sk, 315db8dac20SDavid S. Miller __be16 loc_port, struct in6_addr *loc_addr, 316db8dac20SDavid S. Miller __be16 rmt_port, struct in6_addr *rmt_addr, 317db8dac20SDavid S. Miller int dif) 318db8dac20SDavid S. Miller { 319db8dac20SDavid S. Miller struct hlist_node *node; 320db8dac20SDavid S. Miller struct sock *s = sk; 321db8dac20SDavid S. Miller unsigned short num = ntohs(loc_port); 322db8dac20SDavid S. Miller 323db8dac20SDavid S. Miller sk_for_each_from(s, node) { 324db8dac20SDavid S. Miller struct inet_sock *inet = inet_sk(s); 325db8dac20SDavid S. Miller 3263b1e0a65SYOSHIFUJI Hideaki if (sock_net(s) != sock_net(sk)) 327b8ad0cbcSDaniel Lezcano continue; 328b8ad0cbcSDaniel Lezcano 329db8dac20SDavid S. Miller if (s->sk_hash == num && s->sk_family == PF_INET6) { 330db8dac20SDavid S. Miller struct ipv6_pinfo *np = inet6_sk(s); 331db8dac20SDavid S. Miller if (inet->dport) { 332db8dac20SDavid S. Miller if (inet->dport != rmt_port) 333db8dac20SDavid S. Miller continue; 334db8dac20SDavid S. Miller } 335db8dac20SDavid S. Miller if (!ipv6_addr_any(&np->daddr) && 336db8dac20SDavid S. Miller !ipv6_addr_equal(&np->daddr, rmt_addr)) 337db8dac20SDavid S. Miller continue; 338db8dac20SDavid S. Miller 339db8dac20SDavid S. Miller if (s->sk_bound_dev_if && s->sk_bound_dev_if != dif) 340db8dac20SDavid S. Miller continue; 341db8dac20SDavid S. Miller 342db8dac20SDavid S. Miller if (!ipv6_addr_any(&np->rcv_saddr)) { 343db8dac20SDavid S. Miller if (!ipv6_addr_equal(&np->rcv_saddr, loc_addr)) 344db8dac20SDavid S. Miller continue; 345db8dac20SDavid S. Miller } 346db8dac20SDavid S. Miller if (!inet6_mc_check(s, loc_addr, rmt_addr)) 347db8dac20SDavid S. Miller continue; 348db8dac20SDavid S. Miller return s; 349db8dac20SDavid S. Miller } 350db8dac20SDavid S. Miller } 351db8dac20SDavid S. Miller return NULL; 352db8dac20SDavid S. Miller } 353db8dac20SDavid S. Miller 354db8dac20SDavid S. Miller /* 355db8dac20SDavid S. Miller * Note: called only from the BH handler context, 356db8dac20SDavid S. Miller * so we don't need to lock the hashes. 357db8dac20SDavid S. Miller */ 358e3163493SPavel Emelyanov static int __udp6_lib_mcast_deliver(struct net *net, struct sk_buff *skb, 359e3163493SPavel Emelyanov struct in6_addr *saddr, struct in6_addr *daddr, 360e3163493SPavel Emelyanov struct hlist_head udptable[]) 361db8dac20SDavid S. Miller { 362db8dac20SDavid S. Miller struct sock *sk, *sk2; 363db8dac20SDavid S. Miller const struct udphdr *uh = udp_hdr(skb); 364db8dac20SDavid S. Miller int dif; 365db8dac20SDavid S. Miller 366db8dac20SDavid S. Miller read_lock(&udp_hash_lock); 36719c7578fSPavel Emelyanov sk = sk_head(&udptable[udp_hashfn(net, ntohs(uh->dest))]); 368db8dac20SDavid S. Miller dif = inet6_iif(skb); 369db8dac20SDavid S. Miller sk = udp_v6_mcast_next(sk, uh->dest, daddr, uh->source, saddr, dif); 370db8dac20SDavid S. Miller if (!sk) { 371db8dac20SDavid S. Miller kfree_skb(skb); 372db8dac20SDavid S. Miller goto out; 373db8dac20SDavid S. Miller } 374db8dac20SDavid S. Miller 375db8dac20SDavid S. Miller sk2 = sk; 376db8dac20SDavid S. Miller while ((sk2 = udp_v6_mcast_next(sk_next(sk2), uh->dest, daddr, 377db8dac20SDavid S. Miller uh->source, saddr, dif))) { 378db8dac20SDavid S. Miller struct sk_buff *buff = skb_clone(skb, GFP_ATOMIC); 379db8dac20SDavid S. Miller if (buff) { 380db8dac20SDavid S. Miller bh_lock_sock_nested(sk2); 381db8dac20SDavid S. Miller if (!sock_owned_by_user(sk2)) 382db8dac20SDavid S. Miller udpv6_queue_rcv_skb(sk2, buff); 383db8dac20SDavid S. Miller else 384db8dac20SDavid S. Miller sk_add_backlog(sk2, buff); 385db8dac20SDavid S. Miller bh_unlock_sock(sk2); 386db8dac20SDavid S. Miller } 387db8dac20SDavid S. Miller } 388db8dac20SDavid S. Miller bh_lock_sock_nested(sk); 389db8dac20SDavid S. Miller if (!sock_owned_by_user(sk)) 390db8dac20SDavid S. Miller udpv6_queue_rcv_skb(sk, skb); 391db8dac20SDavid S. Miller else 392db8dac20SDavid S. Miller sk_add_backlog(sk, skb); 393db8dac20SDavid S. Miller bh_unlock_sock(sk); 394db8dac20SDavid S. Miller out: 395db8dac20SDavid S. Miller read_unlock(&udp_hash_lock); 396db8dac20SDavid S. Miller return 0; 397db8dac20SDavid S. Miller } 398db8dac20SDavid S. Miller 399db8dac20SDavid S. Miller static inline int udp6_csum_init(struct sk_buff *skb, struct udphdr *uh, 400db8dac20SDavid S. Miller int proto) 401db8dac20SDavid S. Miller { 402db8dac20SDavid S. Miller int err; 403db8dac20SDavid S. Miller 404db8dac20SDavid S. Miller UDP_SKB_CB(skb)->partial_cov = 0; 405db8dac20SDavid S. Miller UDP_SKB_CB(skb)->cscov = skb->len; 406db8dac20SDavid S. Miller 407db8dac20SDavid S. Miller if (proto == IPPROTO_UDPLITE) { 408db8dac20SDavid S. Miller err = udplite_checksum_init(skb, uh); 409db8dac20SDavid S. Miller if (err) 410db8dac20SDavid S. Miller return err; 411db8dac20SDavid S. Miller } 412db8dac20SDavid S. Miller 413db8dac20SDavid S. Miller if (uh->check == 0) { 414db8dac20SDavid S. Miller /* RFC 2460 section 8.1 says that we SHOULD log 415db8dac20SDavid S. Miller this error. Well, it is reasonable. 416db8dac20SDavid S. Miller */ 417db8dac20SDavid S. Miller LIMIT_NETDEBUG(KERN_INFO "IPv6: udp checksum is 0\n"); 418db8dac20SDavid S. Miller return 1; 419db8dac20SDavid S. Miller } 420db8dac20SDavid S. Miller if (skb->ip_summed == CHECKSUM_COMPLETE && 421db8dac20SDavid S. Miller !csum_ipv6_magic(&ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr, 422db8dac20SDavid S. Miller skb->len, proto, skb->csum)) 423db8dac20SDavid S. Miller skb->ip_summed = CHECKSUM_UNNECESSARY; 424db8dac20SDavid S. Miller 425db8dac20SDavid S. Miller if (!skb_csum_unnecessary(skb)) 426db8dac20SDavid S. Miller skb->csum = ~csum_unfold(csum_ipv6_magic(&ipv6_hdr(skb)->saddr, 427db8dac20SDavid S. Miller &ipv6_hdr(skb)->daddr, 428db8dac20SDavid S. Miller skb->len, proto, 0)); 429db8dac20SDavid S. Miller 430db8dac20SDavid S. Miller return 0; 431db8dac20SDavid S. Miller } 432db8dac20SDavid S. Miller 433db8dac20SDavid S. Miller int __udp6_lib_rcv(struct sk_buff *skb, struct hlist_head udptable[], 434db8dac20SDavid S. Miller int proto) 435db8dac20SDavid S. Miller { 436db8dac20SDavid S. Miller struct sock *sk; 437db8dac20SDavid S. Miller struct udphdr *uh; 438db8dac20SDavid S. Miller struct net_device *dev = skb->dev; 439db8dac20SDavid S. Miller struct in6_addr *saddr, *daddr; 440db8dac20SDavid S. Miller u32 ulen = 0; 441e3163493SPavel Emelyanov struct net *net; 442db8dac20SDavid S. Miller 443db8dac20SDavid S. Miller if (!pskb_may_pull(skb, sizeof(struct udphdr))) 444db8dac20SDavid S. Miller goto short_packet; 445db8dac20SDavid S. Miller 446db8dac20SDavid S. Miller saddr = &ipv6_hdr(skb)->saddr; 447db8dac20SDavid S. Miller daddr = &ipv6_hdr(skb)->daddr; 448db8dac20SDavid S. Miller uh = udp_hdr(skb); 449db8dac20SDavid S. Miller 450db8dac20SDavid S. Miller ulen = ntohs(uh->len); 451db8dac20SDavid S. Miller if (ulen > skb->len) 452db8dac20SDavid S. Miller goto short_packet; 453db8dac20SDavid S. Miller 454db8dac20SDavid S. Miller if (proto == IPPROTO_UDP) { 455db8dac20SDavid S. Miller /* UDP validates ulen. */ 456db8dac20SDavid S. Miller 457db8dac20SDavid S. Miller /* Check for jumbo payload */ 458db8dac20SDavid S. Miller if (ulen == 0) 459db8dac20SDavid S. Miller ulen = skb->len; 460db8dac20SDavid S. Miller 461db8dac20SDavid S. Miller if (ulen < sizeof(*uh)) 462db8dac20SDavid S. Miller goto short_packet; 463db8dac20SDavid S. Miller 464db8dac20SDavid S. Miller if (ulen < skb->len) { 465db8dac20SDavid S. Miller if (pskb_trim_rcsum(skb, ulen)) 466db8dac20SDavid S. Miller goto short_packet; 467db8dac20SDavid S. Miller saddr = &ipv6_hdr(skb)->saddr; 468db8dac20SDavid S. Miller daddr = &ipv6_hdr(skb)->daddr; 469db8dac20SDavid S. Miller uh = udp_hdr(skb); 470db8dac20SDavid S. Miller } 471db8dac20SDavid S. Miller } 472db8dac20SDavid S. Miller 473db8dac20SDavid S. Miller if (udp6_csum_init(skb, uh, proto)) 474db8dac20SDavid S. Miller goto discard; 475db8dac20SDavid S. Miller 476e3163493SPavel Emelyanov net = dev_net(skb->dev); 477db8dac20SDavid S. Miller /* 478db8dac20SDavid S. Miller * Multicast receive code 479db8dac20SDavid S. Miller */ 480db8dac20SDavid S. Miller if (ipv6_addr_is_multicast(daddr)) 481e3163493SPavel Emelyanov return __udp6_lib_mcast_deliver(net, skb, 482e3163493SPavel Emelyanov saddr, daddr, udptable); 483db8dac20SDavid S. Miller 484db8dac20SDavid S. Miller /* Unicast */ 485db8dac20SDavid S. Miller 486db8dac20SDavid S. Miller /* 487db8dac20SDavid S. Miller * check socket cache ... must talk to Alan about his plans 488db8dac20SDavid S. Miller * for sock caches... i'll skip this for now. 489db8dac20SDavid S. Miller */ 490e3163493SPavel Emelyanov sk = __udp6_lib_lookup(net, saddr, uh->source, 491db8dac20SDavid S. Miller daddr, uh->dest, inet6_iif(skb), udptable); 492db8dac20SDavid S. Miller 493db8dac20SDavid S. Miller if (sk == NULL) { 494db8dac20SDavid S. Miller if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) 495db8dac20SDavid S. Miller goto discard; 496db8dac20SDavid S. Miller 497db8dac20SDavid S. Miller if (udp_lib_checksum_complete(skb)) 498db8dac20SDavid S. Miller goto discard; 499db8dac20SDavid S. Miller UDP6_INC_STATS_BH(UDP_MIB_NOPORTS, proto == IPPROTO_UDPLITE); 500db8dac20SDavid S. Miller 501db8dac20SDavid S. Miller icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0, dev); 502db8dac20SDavid S. Miller 503db8dac20SDavid S. Miller kfree_skb(skb); 504db8dac20SDavid S. Miller return 0; 505db8dac20SDavid S. Miller } 506db8dac20SDavid S. Miller 507db8dac20SDavid S. Miller /* deliver */ 508db8dac20SDavid S. Miller 509db8dac20SDavid S. Miller bh_lock_sock_nested(sk); 510db8dac20SDavid S. Miller if (!sock_owned_by_user(sk)) 511db8dac20SDavid S. Miller udpv6_queue_rcv_skb(sk, skb); 512db8dac20SDavid S. Miller else 513db8dac20SDavid S. Miller sk_add_backlog(sk, skb); 514db8dac20SDavid S. Miller bh_unlock_sock(sk); 515db8dac20SDavid S. Miller sock_put(sk); 516db8dac20SDavid S. Miller return 0; 517db8dac20SDavid S. Miller 518db8dac20SDavid S. Miller short_packet: 519db8dac20SDavid S. Miller LIMIT_NETDEBUG(KERN_DEBUG "UDP%sv6: short packet: %d/%u\n", 520db8dac20SDavid S. Miller proto == IPPROTO_UDPLITE ? "-Lite" : "", 521db8dac20SDavid S. Miller ulen, skb->len); 522db8dac20SDavid S. Miller 523db8dac20SDavid S. Miller discard: 524db8dac20SDavid S. Miller UDP6_INC_STATS_BH(UDP_MIB_INERRORS, proto == IPPROTO_UDPLITE); 525db8dac20SDavid S. Miller kfree_skb(skb); 526db8dac20SDavid S. Miller return 0; 527db8dac20SDavid S. Miller } 528db8dac20SDavid S. Miller 529db8dac20SDavid S. Miller static __inline__ int udpv6_rcv(struct sk_buff *skb) 530db8dac20SDavid S. Miller { 531db8dac20SDavid S. Miller return __udp6_lib_rcv(skb, udp_hash, IPPROTO_UDP); 532db8dac20SDavid S. Miller } 533db8dac20SDavid S. Miller 534db8dac20SDavid S. Miller /* 535db8dac20SDavid S. Miller * Throw away all pending data and cancel the corking. Socket is locked. 536db8dac20SDavid S. Miller */ 537db8dac20SDavid S. Miller static void udp_v6_flush_pending_frames(struct sock *sk) 538db8dac20SDavid S. Miller { 539db8dac20SDavid S. Miller struct udp_sock *up = udp_sk(sk); 540db8dac20SDavid S. Miller 54136d926b9SDenis V. Lunev if (up->pending == AF_INET) 54236d926b9SDenis V. Lunev udp_flush_pending_frames(sk); 54336d926b9SDenis V. Lunev else if (up->pending) { 544db8dac20SDavid S. Miller up->len = 0; 545db8dac20SDavid S. Miller up->pending = 0; 546db8dac20SDavid S. Miller ip6_flush_pending_frames(sk); 547db8dac20SDavid S. Miller } 548db8dac20SDavid S. Miller } 549db8dac20SDavid S. Miller 550db8dac20SDavid S. Miller /* 551db8dac20SDavid S. Miller * Sending 552db8dac20SDavid S. Miller */ 553db8dac20SDavid S. Miller 554db8dac20SDavid S. Miller static int udp_v6_push_pending_frames(struct sock *sk) 555db8dac20SDavid S. Miller { 556db8dac20SDavid S. Miller struct sk_buff *skb; 557db8dac20SDavid S. Miller struct udphdr *uh; 558db8dac20SDavid S. Miller struct udp_sock *up = udp_sk(sk); 559db8dac20SDavid S. Miller struct inet_sock *inet = inet_sk(sk); 560db8dac20SDavid S. Miller struct flowi *fl = &inet->cork.fl; 561db8dac20SDavid S. Miller int err = 0; 562db8dac20SDavid S. Miller int is_udplite = IS_UDPLITE(sk); 563db8dac20SDavid S. Miller __wsum csum = 0; 564db8dac20SDavid S. Miller 565db8dac20SDavid S. Miller /* Grab the skbuff where UDP header space exists. */ 566db8dac20SDavid S. Miller if ((skb = skb_peek(&sk->sk_write_queue)) == NULL) 567db8dac20SDavid S. Miller goto out; 568db8dac20SDavid S. Miller 569db8dac20SDavid S. Miller /* 570db8dac20SDavid S. Miller * Create a UDP header 571db8dac20SDavid S. Miller */ 572db8dac20SDavid S. Miller uh = udp_hdr(skb); 573db8dac20SDavid S. Miller uh->source = fl->fl_ip_sport; 574db8dac20SDavid S. Miller uh->dest = fl->fl_ip_dport; 575db8dac20SDavid S. Miller uh->len = htons(up->len); 576db8dac20SDavid S. Miller uh->check = 0; 577db8dac20SDavid S. Miller 578db8dac20SDavid S. Miller if (is_udplite) 579db8dac20SDavid S. Miller csum = udplite_csum_outgoing(sk, skb); 580db8dac20SDavid S. Miller else 581db8dac20SDavid S. Miller csum = udp_csum_outgoing(sk, skb); 582db8dac20SDavid S. Miller 583db8dac20SDavid S. Miller /* add protocol-dependent pseudo-header */ 584db8dac20SDavid S. Miller uh->check = csum_ipv6_magic(&fl->fl6_src, &fl->fl6_dst, 585db8dac20SDavid S. Miller up->len, fl->proto, csum ); 586db8dac20SDavid S. Miller if (uh->check == 0) 587db8dac20SDavid S. Miller uh->check = CSUM_MANGLED_0; 588db8dac20SDavid S. Miller 589db8dac20SDavid S. Miller err = ip6_push_pending_frames(sk); 590db8dac20SDavid S. Miller out: 591db8dac20SDavid S. Miller up->len = 0; 592db8dac20SDavid S. Miller up->pending = 0; 593db8dac20SDavid S. Miller if (!err) 594db8dac20SDavid S. Miller UDP6_INC_STATS_USER(UDP_MIB_OUTDATAGRAMS, is_udplite); 595db8dac20SDavid S. Miller return err; 596db8dac20SDavid S. Miller } 597db8dac20SDavid S. Miller 598db8dac20SDavid S. Miller int udpv6_sendmsg(struct kiocb *iocb, struct sock *sk, 599db8dac20SDavid S. Miller struct msghdr *msg, size_t len) 600db8dac20SDavid S. Miller { 601db8dac20SDavid S. Miller struct ipv6_txoptions opt_space; 602db8dac20SDavid S. Miller struct udp_sock *up = udp_sk(sk); 603db8dac20SDavid S. Miller struct inet_sock *inet = inet_sk(sk); 604db8dac20SDavid S. Miller struct ipv6_pinfo *np = inet6_sk(sk); 605db8dac20SDavid S. Miller struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *) msg->msg_name; 606db8dac20SDavid S. Miller struct in6_addr *daddr, *final_p = NULL, final; 607db8dac20SDavid S. Miller struct ipv6_txoptions *opt = NULL; 608db8dac20SDavid S. Miller struct ip6_flowlabel *flowlabel = NULL; 609db8dac20SDavid S. Miller struct flowi fl; 610db8dac20SDavid S. Miller struct dst_entry *dst; 611db8dac20SDavid S. Miller int addr_len = msg->msg_namelen; 612db8dac20SDavid S. Miller int ulen = len; 613db8dac20SDavid S. Miller int hlimit = -1; 614db8dac20SDavid S. Miller int tclass = -1; 615db8dac20SDavid S. Miller int corkreq = up->corkflag || msg->msg_flags&MSG_MORE; 616db8dac20SDavid S. Miller int err; 617db8dac20SDavid S. Miller int connected = 0; 618db8dac20SDavid S. Miller int is_udplite = IS_UDPLITE(sk); 619db8dac20SDavid S. Miller int (*getfrag)(void *, char *, int, int, int, struct sk_buff *); 620db8dac20SDavid S. Miller 621db8dac20SDavid S. Miller /* destination address check */ 622db8dac20SDavid S. Miller if (sin6) { 623db8dac20SDavid S. Miller if (addr_len < offsetof(struct sockaddr, sa_data)) 624db8dac20SDavid S. Miller return -EINVAL; 625db8dac20SDavid S. Miller 626db8dac20SDavid S. Miller switch (sin6->sin6_family) { 627db8dac20SDavid S. Miller case AF_INET6: 628db8dac20SDavid S. Miller if (addr_len < SIN6_LEN_RFC2133) 629db8dac20SDavid S. Miller return -EINVAL; 630db8dac20SDavid S. Miller daddr = &sin6->sin6_addr; 631db8dac20SDavid S. Miller break; 632db8dac20SDavid S. Miller case AF_INET: 633db8dac20SDavid S. Miller goto do_udp_sendmsg; 634db8dac20SDavid S. Miller case AF_UNSPEC: 635db8dac20SDavid S. Miller msg->msg_name = sin6 = NULL; 636db8dac20SDavid S. Miller msg->msg_namelen = addr_len = 0; 637db8dac20SDavid S. Miller daddr = NULL; 638db8dac20SDavid S. Miller break; 639db8dac20SDavid S. Miller default: 640db8dac20SDavid S. Miller return -EINVAL; 641db8dac20SDavid S. Miller } 642db8dac20SDavid S. Miller } else if (!up->pending) { 643db8dac20SDavid S. Miller if (sk->sk_state != TCP_ESTABLISHED) 644db8dac20SDavid S. Miller return -EDESTADDRREQ; 645db8dac20SDavid S. Miller daddr = &np->daddr; 646db8dac20SDavid S. Miller } else 647db8dac20SDavid S. Miller daddr = NULL; 648db8dac20SDavid S. Miller 649db8dac20SDavid S. Miller if (daddr) { 650db8dac20SDavid S. Miller if (ipv6_addr_v4mapped(daddr)) { 651db8dac20SDavid S. Miller struct sockaddr_in sin; 652db8dac20SDavid S. Miller sin.sin_family = AF_INET; 653db8dac20SDavid S. Miller sin.sin_port = sin6 ? sin6->sin6_port : inet->dport; 654db8dac20SDavid S. Miller sin.sin_addr.s_addr = daddr->s6_addr32[3]; 655db8dac20SDavid S. Miller msg->msg_name = &sin; 656db8dac20SDavid S. Miller msg->msg_namelen = sizeof(sin); 657db8dac20SDavid S. Miller do_udp_sendmsg: 658db8dac20SDavid S. Miller if (__ipv6_only_sock(sk)) 659db8dac20SDavid S. Miller return -ENETUNREACH; 660db8dac20SDavid S. Miller return udp_sendmsg(iocb, sk, msg, len); 661db8dac20SDavid S. Miller } 662db8dac20SDavid S. Miller } 663db8dac20SDavid S. Miller 664db8dac20SDavid S. Miller if (up->pending == AF_INET) 665db8dac20SDavid S. Miller return udp_sendmsg(iocb, sk, msg, len); 666db8dac20SDavid S. Miller 667db8dac20SDavid S. Miller /* Rough check on arithmetic overflow, 668db8dac20SDavid S. Miller better check is made in ip6_append_data(). 669db8dac20SDavid S. Miller */ 670db8dac20SDavid S. Miller if (len > INT_MAX - sizeof(struct udphdr)) 671db8dac20SDavid S. Miller return -EMSGSIZE; 672db8dac20SDavid S. Miller 673db8dac20SDavid S. Miller if (up->pending) { 674db8dac20SDavid S. Miller /* 675db8dac20SDavid S. Miller * There are pending frames. 676db8dac20SDavid S. Miller * The socket lock must be held while it's corked. 677db8dac20SDavid S. Miller */ 678db8dac20SDavid S. Miller lock_sock(sk); 679db8dac20SDavid S. Miller if (likely(up->pending)) { 680db8dac20SDavid S. Miller if (unlikely(up->pending != AF_INET6)) { 681db8dac20SDavid S. Miller release_sock(sk); 682db8dac20SDavid S. Miller return -EAFNOSUPPORT; 683db8dac20SDavid S. Miller } 684db8dac20SDavid S. Miller dst = NULL; 685db8dac20SDavid S. Miller goto do_append_data; 686db8dac20SDavid S. Miller } 687db8dac20SDavid S. Miller release_sock(sk); 688db8dac20SDavid S. Miller } 689db8dac20SDavid S. Miller ulen += sizeof(struct udphdr); 690db8dac20SDavid S. Miller 691db8dac20SDavid S. Miller memset(&fl, 0, sizeof(fl)); 692db8dac20SDavid S. Miller 693db8dac20SDavid S. Miller if (sin6) { 694db8dac20SDavid S. Miller if (sin6->sin6_port == 0) 695db8dac20SDavid S. Miller return -EINVAL; 696db8dac20SDavid S. Miller 697db8dac20SDavid S. Miller fl.fl_ip_dport = sin6->sin6_port; 698db8dac20SDavid S. Miller daddr = &sin6->sin6_addr; 699db8dac20SDavid S. Miller 700db8dac20SDavid S. Miller if (np->sndflow) { 701db8dac20SDavid S. Miller fl.fl6_flowlabel = sin6->sin6_flowinfo&IPV6_FLOWINFO_MASK; 702db8dac20SDavid S. Miller if (fl.fl6_flowlabel&IPV6_FLOWLABEL_MASK) { 703db8dac20SDavid S. Miller flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel); 704db8dac20SDavid S. Miller if (flowlabel == NULL) 705db8dac20SDavid S. Miller return -EINVAL; 706db8dac20SDavid S. Miller daddr = &flowlabel->dst; 707db8dac20SDavid S. Miller } 708db8dac20SDavid S. Miller } 709db8dac20SDavid S. Miller 710db8dac20SDavid S. Miller /* 711db8dac20SDavid S. Miller * Otherwise it will be difficult to maintain 712db8dac20SDavid S. Miller * sk->sk_dst_cache. 713db8dac20SDavid S. Miller */ 714db8dac20SDavid S. Miller if (sk->sk_state == TCP_ESTABLISHED && 715db8dac20SDavid S. Miller ipv6_addr_equal(daddr, &np->daddr)) 716db8dac20SDavid S. Miller daddr = &np->daddr; 717db8dac20SDavid S. Miller 718db8dac20SDavid S. Miller if (addr_len >= sizeof(struct sockaddr_in6) && 719db8dac20SDavid S. Miller sin6->sin6_scope_id && 720db8dac20SDavid S. Miller ipv6_addr_type(daddr)&IPV6_ADDR_LINKLOCAL) 721db8dac20SDavid S. Miller fl.oif = sin6->sin6_scope_id; 722db8dac20SDavid S. Miller } else { 723db8dac20SDavid S. Miller if (sk->sk_state != TCP_ESTABLISHED) 724db8dac20SDavid S. Miller return -EDESTADDRREQ; 725db8dac20SDavid S. Miller 726db8dac20SDavid S. Miller fl.fl_ip_dport = inet->dport; 727db8dac20SDavid S. Miller daddr = &np->daddr; 728db8dac20SDavid S. Miller fl.fl6_flowlabel = np->flow_label; 729db8dac20SDavid S. Miller connected = 1; 730db8dac20SDavid S. Miller } 731db8dac20SDavid S. Miller 732db8dac20SDavid S. Miller if (!fl.oif) 733db8dac20SDavid S. Miller fl.oif = sk->sk_bound_dev_if; 734db8dac20SDavid S. Miller 735db8dac20SDavid S. Miller if (msg->msg_controllen) { 736db8dac20SDavid S. Miller opt = &opt_space; 737db8dac20SDavid S. Miller memset(opt, 0, sizeof(struct ipv6_txoptions)); 738db8dac20SDavid S. Miller opt->tot_len = sizeof(*opt); 739db8dac20SDavid S. Miller 74091e1908fSYOSHIFUJI Hideaki err = datagram_send_ctl(sock_net(sk), msg, &fl, opt, &hlimit, &tclass); 741db8dac20SDavid S. Miller if (err < 0) { 742db8dac20SDavid S. Miller fl6_sock_release(flowlabel); 743db8dac20SDavid S. Miller return err; 744db8dac20SDavid S. Miller } 745db8dac20SDavid S. Miller if ((fl.fl6_flowlabel&IPV6_FLOWLABEL_MASK) && !flowlabel) { 746db8dac20SDavid S. Miller flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel); 747db8dac20SDavid S. Miller if (flowlabel == NULL) 748db8dac20SDavid S. Miller return -EINVAL; 749db8dac20SDavid S. Miller } 750db8dac20SDavid S. Miller if (!(opt->opt_nflen|opt->opt_flen)) 751db8dac20SDavid S. Miller opt = NULL; 752db8dac20SDavid S. Miller connected = 0; 753db8dac20SDavid S. Miller } 754db8dac20SDavid S. Miller if (opt == NULL) 755db8dac20SDavid S. Miller opt = np->opt; 756db8dac20SDavid S. Miller if (flowlabel) 757db8dac20SDavid S. Miller opt = fl6_merge_options(&opt_space, flowlabel, opt); 758db8dac20SDavid S. Miller opt = ipv6_fixup_options(&opt_space, opt); 759db8dac20SDavid S. Miller 760db8dac20SDavid S. Miller fl.proto = sk->sk_protocol; 761876c7f41SBrian Haley if (!ipv6_addr_any(daddr)) 762db8dac20SDavid S. Miller ipv6_addr_copy(&fl.fl6_dst, daddr); 763876c7f41SBrian Haley else 764876c7f41SBrian Haley fl.fl6_dst.s6_addr[15] = 0x1; /* :: means loopback (BSD'ism) */ 765db8dac20SDavid S. Miller if (ipv6_addr_any(&fl.fl6_src) && !ipv6_addr_any(&np->saddr)) 766db8dac20SDavid S. Miller ipv6_addr_copy(&fl.fl6_src, &np->saddr); 767db8dac20SDavid S. Miller fl.fl_ip_sport = inet->sport; 768db8dac20SDavid S. Miller 769db8dac20SDavid S. Miller /* merge ip6_build_xmit from ip6_output */ 770db8dac20SDavid S. Miller if (opt && opt->srcrt) { 771db8dac20SDavid S. Miller struct rt0_hdr *rt0 = (struct rt0_hdr *) opt->srcrt; 772db8dac20SDavid S. Miller ipv6_addr_copy(&final, &fl.fl6_dst); 773db8dac20SDavid S. Miller ipv6_addr_copy(&fl.fl6_dst, rt0->addr); 774db8dac20SDavid S. Miller final_p = &final; 775db8dac20SDavid S. Miller connected = 0; 776db8dac20SDavid S. Miller } 777db8dac20SDavid S. Miller 778db8dac20SDavid S. Miller if (!fl.oif && ipv6_addr_is_multicast(&fl.fl6_dst)) { 779db8dac20SDavid S. Miller fl.oif = np->mcast_oif; 780db8dac20SDavid S. Miller connected = 0; 781db8dac20SDavid S. Miller } 782db8dac20SDavid S. Miller 783db8dac20SDavid S. Miller security_sk_classify_flow(sk, &fl); 784db8dac20SDavid S. Miller 785db8dac20SDavid S. Miller err = ip6_sk_dst_lookup(sk, &dst, &fl); 786db8dac20SDavid S. Miller if (err) 787db8dac20SDavid S. Miller goto out; 788db8dac20SDavid S. Miller if (final_p) 789db8dac20SDavid S. Miller ipv6_addr_copy(&fl.fl6_dst, final_p); 790db8dac20SDavid S. Miller 791db8dac20SDavid S. Miller if ((err = __xfrm_lookup(&dst, &fl, sk, XFRM_LOOKUP_WAIT)) < 0) { 792db8dac20SDavid S. Miller if (err == -EREMOTE) 793db8dac20SDavid S. Miller err = ip6_dst_blackhole(sk, &dst, &fl); 794db8dac20SDavid S. Miller if (err < 0) 795db8dac20SDavid S. Miller goto out; 796db8dac20SDavid S. Miller } 797db8dac20SDavid S. Miller 798db8dac20SDavid S. Miller if (hlimit < 0) { 799db8dac20SDavid S. Miller if (ipv6_addr_is_multicast(&fl.fl6_dst)) 800db8dac20SDavid S. Miller hlimit = np->mcast_hops; 801db8dac20SDavid S. Miller else 802db8dac20SDavid S. Miller hlimit = np->hop_limit; 803db8dac20SDavid S. Miller if (hlimit < 0) 8046b75d090SYOSHIFUJI Hideaki hlimit = ip6_dst_hoplimit(dst); 805db8dac20SDavid S. Miller } 806db8dac20SDavid S. Miller 807db8dac20SDavid S. Miller if (tclass < 0) { 808db8dac20SDavid S. Miller tclass = np->tclass; 809db8dac20SDavid S. Miller if (tclass < 0) 810db8dac20SDavid S. Miller tclass = 0; 811db8dac20SDavid S. Miller } 812db8dac20SDavid S. Miller 813db8dac20SDavid S. Miller if (msg->msg_flags&MSG_CONFIRM) 814db8dac20SDavid S. Miller goto do_confirm; 815db8dac20SDavid S. Miller back_from_confirm: 816db8dac20SDavid S. Miller 817db8dac20SDavid S. Miller lock_sock(sk); 818db8dac20SDavid S. Miller if (unlikely(up->pending)) { 819db8dac20SDavid S. Miller /* The socket is already corked while preparing it. */ 820db8dac20SDavid S. Miller /* ... which is an evident application bug. --ANK */ 821db8dac20SDavid S. Miller release_sock(sk); 822db8dac20SDavid S. Miller 823db8dac20SDavid S. Miller LIMIT_NETDEBUG(KERN_DEBUG "udp cork app bug 2\n"); 824db8dac20SDavid S. Miller err = -EINVAL; 825db8dac20SDavid S. Miller goto out; 826db8dac20SDavid S. Miller } 827db8dac20SDavid S. Miller 828db8dac20SDavid S. Miller up->pending = AF_INET6; 829db8dac20SDavid S. Miller 830db8dac20SDavid S. Miller do_append_data: 831db8dac20SDavid S. Miller up->len += ulen; 832db8dac20SDavid S. Miller getfrag = is_udplite ? udplite_getfrag : ip_generic_getfrag; 833db8dac20SDavid S. Miller err = ip6_append_data(sk, getfrag, msg->msg_iov, ulen, 834db8dac20SDavid S. Miller sizeof(struct udphdr), hlimit, tclass, opt, &fl, 835db8dac20SDavid S. Miller (struct rt6_info*)dst, 836db8dac20SDavid S. Miller corkreq ? msg->msg_flags|MSG_MORE : msg->msg_flags); 837db8dac20SDavid S. Miller if (err) 838db8dac20SDavid S. Miller udp_v6_flush_pending_frames(sk); 839db8dac20SDavid S. Miller else if (!corkreq) 840db8dac20SDavid S. Miller err = udp_v6_push_pending_frames(sk); 841db8dac20SDavid S. Miller else if (unlikely(skb_queue_empty(&sk->sk_write_queue))) 842db8dac20SDavid S. Miller up->pending = 0; 843db8dac20SDavid S. Miller 844db8dac20SDavid S. Miller if (dst) { 845db8dac20SDavid S. Miller if (connected) { 846db8dac20SDavid S. Miller ip6_dst_store(sk, dst, 847db8dac20SDavid S. Miller ipv6_addr_equal(&fl.fl6_dst, &np->daddr) ? 848db8dac20SDavid S. Miller &np->daddr : NULL, 849db8dac20SDavid S. Miller #ifdef CONFIG_IPV6_SUBTREES 850db8dac20SDavid S. Miller ipv6_addr_equal(&fl.fl6_src, &np->saddr) ? 851db8dac20SDavid S. Miller &np->saddr : 852db8dac20SDavid S. Miller #endif 853db8dac20SDavid S. Miller NULL); 854db8dac20SDavid S. Miller } else { 855db8dac20SDavid S. Miller dst_release(dst); 856db8dac20SDavid S. Miller } 857a3c96089SYOSHIFUJI Hideaki dst = NULL; 858db8dac20SDavid S. Miller } 859db8dac20SDavid S. Miller 860db8dac20SDavid S. Miller if (err > 0) 861db8dac20SDavid S. Miller err = np->recverr ? net_xmit_errno(err) : 0; 862db8dac20SDavid S. Miller release_sock(sk); 863db8dac20SDavid S. Miller out: 864a3c96089SYOSHIFUJI Hideaki dst_release(dst); 865db8dac20SDavid S. Miller fl6_sock_release(flowlabel); 866db8dac20SDavid S. Miller if (!err) 867db8dac20SDavid S. Miller return len; 868db8dac20SDavid S. Miller /* 869db8dac20SDavid S. Miller * ENOBUFS = no kernel mem, SOCK_NOSPACE = no sndbuf space. Reporting 870db8dac20SDavid S. Miller * ENOBUFS might not be good (it's not tunable per se), but otherwise 871db8dac20SDavid S. Miller * we don't have a good statistic (IpOutDiscards but it can be too many 872db8dac20SDavid S. Miller * things). We could add another new stat but at least for now that 873db8dac20SDavid S. Miller * seems like overkill. 874db8dac20SDavid S. Miller */ 875db8dac20SDavid S. Miller if (err == -ENOBUFS || test_bit(SOCK_NOSPACE, &sk->sk_socket->flags)) { 876db8dac20SDavid S. Miller UDP6_INC_STATS_USER(UDP_MIB_SNDBUFERRORS, is_udplite); 877db8dac20SDavid S. Miller } 878db8dac20SDavid S. Miller return err; 879db8dac20SDavid S. Miller 880db8dac20SDavid S. Miller do_confirm: 881db8dac20SDavid S. Miller dst_confirm(dst); 882db8dac20SDavid S. Miller if (!(msg->msg_flags&MSG_PROBE) || len) 883db8dac20SDavid S. Miller goto back_from_confirm; 884db8dac20SDavid S. Miller err = 0; 885db8dac20SDavid S. Miller goto out; 886db8dac20SDavid S. Miller } 887db8dac20SDavid S. Miller 8887d06b2e0SBrian Haley void udpv6_destroy_sock(struct sock *sk) 889db8dac20SDavid S. Miller { 890db8dac20SDavid S. Miller lock_sock(sk); 891db8dac20SDavid S. Miller udp_v6_flush_pending_frames(sk); 892db8dac20SDavid S. Miller release_sock(sk); 893db8dac20SDavid S. Miller 894db8dac20SDavid S. Miller inet6_destroy_sock(sk); 895db8dac20SDavid S. Miller } 896db8dac20SDavid S. Miller 897db8dac20SDavid S. Miller /* 898db8dac20SDavid S. Miller * Socket option code for UDP 899db8dac20SDavid S. Miller */ 900db8dac20SDavid S. Miller int udpv6_setsockopt(struct sock *sk, int level, int optname, 901db8dac20SDavid S. Miller char __user *optval, int optlen) 902db8dac20SDavid S. Miller { 903db8dac20SDavid S. Miller if (level == SOL_UDP || level == SOL_UDPLITE) 904db8dac20SDavid S. Miller return udp_lib_setsockopt(sk, level, optname, optval, optlen, 905db8dac20SDavid S. Miller udp_v6_push_pending_frames); 906db8dac20SDavid S. Miller return ipv6_setsockopt(sk, level, optname, optval, optlen); 907db8dac20SDavid S. Miller } 908db8dac20SDavid S. Miller 909db8dac20SDavid S. Miller #ifdef CONFIG_COMPAT 910db8dac20SDavid S. Miller int compat_udpv6_setsockopt(struct sock *sk, int level, int optname, 911db8dac20SDavid S. Miller char __user *optval, int optlen) 912db8dac20SDavid S. Miller { 913db8dac20SDavid S. Miller if (level == SOL_UDP || level == SOL_UDPLITE) 914db8dac20SDavid S. Miller return udp_lib_setsockopt(sk, level, optname, optval, optlen, 915db8dac20SDavid S. Miller udp_v6_push_pending_frames); 916db8dac20SDavid S. Miller return compat_ipv6_setsockopt(sk, level, optname, optval, optlen); 917db8dac20SDavid S. Miller } 918db8dac20SDavid S. Miller #endif 919db8dac20SDavid S. Miller 920db8dac20SDavid S. Miller int udpv6_getsockopt(struct sock *sk, int level, int optname, 921db8dac20SDavid S. Miller char __user *optval, int __user *optlen) 922db8dac20SDavid S. Miller { 923db8dac20SDavid S. Miller if (level == SOL_UDP || level == SOL_UDPLITE) 924db8dac20SDavid S. Miller return udp_lib_getsockopt(sk, level, optname, optval, optlen); 925db8dac20SDavid S. Miller return ipv6_getsockopt(sk, level, optname, optval, optlen); 926db8dac20SDavid S. Miller } 927db8dac20SDavid S. Miller 928db8dac20SDavid S. Miller #ifdef CONFIG_COMPAT 929db8dac20SDavid S. Miller int compat_udpv6_getsockopt(struct sock *sk, int level, int optname, 930db8dac20SDavid S. Miller char __user *optval, int __user *optlen) 931db8dac20SDavid S. Miller { 932db8dac20SDavid S. Miller if (level == SOL_UDP || level == SOL_UDPLITE) 933db8dac20SDavid S. Miller return udp_lib_getsockopt(sk, level, optname, optval, optlen); 934db8dac20SDavid S. Miller return compat_ipv6_getsockopt(sk, level, optname, optval, optlen); 935db8dac20SDavid S. Miller } 936db8dac20SDavid S. Miller #endif 937db8dac20SDavid S. Miller 938db8dac20SDavid S. Miller static struct inet6_protocol udpv6_protocol = { 939db8dac20SDavid S. Miller .handler = udpv6_rcv, 940db8dac20SDavid S. Miller .err_handler = udpv6_err, 941db8dac20SDavid S. Miller .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL, 942db8dac20SDavid S. Miller }; 943db8dac20SDavid S. Miller 944db8dac20SDavid S. Miller /* ------------------------------------------------------------------------ */ 945db8dac20SDavid S. Miller #ifdef CONFIG_PROC_FS 946db8dac20SDavid S. Miller 947db8dac20SDavid S. Miller static void udp6_sock_seq_show(struct seq_file *seq, struct sock *sp, int bucket) 948db8dac20SDavid S. Miller { 949db8dac20SDavid S. Miller struct inet_sock *inet = inet_sk(sp); 950db8dac20SDavid S. Miller struct ipv6_pinfo *np = inet6_sk(sp); 951db8dac20SDavid S. Miller struct in6_addr *dest, *src; 952db8dac20SDavid S. Miller __u16 destp, srcp; 953db8dac20SDavid S. Miller 954db8dac20SDavid S. Miller dest = &np->daddr; 955db8dac20SDavid S. Miller src = &np->rcv_saddr; 956db8dac20SDavid S. Miller destp = ntohs(inet->dport); 957db8dac20SDavid S. Miller srcp = ntohs(inet->sport); 958db8dac20SDavid S. Miller seq_printf(seq, 959db8dac20SDavid S. Miller "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X " 960cb61cb9bSEric Dumazet "%02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %p %d\n", 961db8dac20SDavid S. Miller bucket, 962db8dac20SDavid S. Miller src->s6_addr32[0], src->s6_addr32[1], 963db8dac20SDavid S. Miller src->s6_addr32[2], src->s6_addr32[3], srcp, 964db8dac20SDavid S. Miller dest->s6_addr32[0], dest->s6_addr32[1], 965db8dac20SDavid S. Miller dest->s6_addr32[2], dest->s6_addr32[3], destp, 966db8dac20SDavid S. Miller sp->sk_state, 967db8dac20SDavid S. Miller atomic_read(&sp->sk_wmem_alloc), 968db8dac20SDavid S. Miller atomic_read(&sp->sk_rmem_alloc), 969db8dac20SDavid S. Miller 0, 0L, 0, 970db8dac20SDavid S. Miller sock_i_uid(sp), 0, 971db8dac20SDavid S. Miller sock_i_ino(sp), 972cb61cb9bSEric Dumazet atomic_read(&sp->sk_refcnt), sp, 973cb61cb9bSEric Dumazet atomic_read(&sp->sk_drops)); 974db8dac20SDavid S. Miller } 975db8dac20SDavid S. Miller 976db8dac20SDavid S. Miller int udp6_seq_show(struct seq_file *seq, void *v) 977db8dac20SDavid S. Miller { 978db8dac20SDavid S. Miller if (v == SEQ_START_TOKEN) 979db8dac20SDavid S. Miller seq_printf(seq, 980db8dac20SDavid S. Miller " sl " 981db8dac20SDavid S. Miller "local_address " 982db8dac20SDavid S. Miller "remote_address " 983db8dac20SDavid S. Miller "st tx_queue rx_queue tr tm->when retrnsmt" 984cb61cb9bSEric Dumazet " uid timeout inode ref pointer drops\n"); 985db8dac20SDavid S. Miller else 986db8dac20SDavid S. Miller udp6_sock_seq_show(seq, v, ((struct udp_iter_state *)seq->private)->bucket); 987db8dac20SDavid S. Miller return 0; 988db8dac20SDavid S. Miller } 989db8dac20SDavid S. Miller 990db8dac20SDavid S. Miller static struct udp_seq_afinfo udp6_seq_afinfo = { 991db8dac20SDavid S. Miller .name = "udp6", 992db8dac20SDavid S. Miller .family = AF_INET6, 993db8dac20SDavid S. Miller .hashtable = udp_hash, 9944ad96d39SDenis V. Lunev .seq_fops = { 9954ad96d39SDenis V. Lunev .owner = THIS_MODULE, 9964ad96d39SDenis V. Lunev }, 997dda61925SDenis V. Lunev .seq_ops = { 998dda61925SDenis V. Lunev .show = udp6_seq_show, 999dda61925SDenis V. Lunev }, 1000db8dac20SDavid S. Miller }; 1001db8dac20SDavid S. Miller 10020c96d8c5SDaniel Lezcano int udp6_proc_init(struct net *net) 1003db8dac20SDavid S. Miller { 10040c96d8c5SDaniel Lezcano return udp_proc_register(net, &udp6_seq_afinfo); 1005db8dac20SDavid S. Miller } 1006db8dac20SDavid S. Miller 10070c96d8c5SDaniel Lezcano void udp6_proc_exit(struct net *net) { 10080c96d8c5SDaniel Lezcano udp_proc_unregister(net, &udp6_seq_afinfo); 1009db8dac20SDavid S. Miller } 1010db8dac20SDavid S. Miller #endif /* CONFIG_PROC_FS */ 1011db8dac20SDavid S. Miller 1012db8dac20SDavid S. Miller /* ------------------------------------------------------------------------ */ 1013db8dac20SDavid S. Miller 1014db8dac20SDavid S. Miller struct proto udpv6_prot = { 1015db8dac20SDavid S. Miller .name = "UDPv6", 1016db8dac20SDavid S. Miller .owner = THIS_MODULE, 1017db8dac20SDavid S. Miller .close = udp_lib_close, 1018db8dac20SDavid S. Miller .connect = ip6_datagram_connect, 1019db8dac20SDavid S. Miller .disconnect = udp_disconnect, 1020db8dac20SDavid S. Miller .ioctl = udp_ioctl, 1021db8dac20SDavid S. Miller .destroy = udpv6_destroy_sock, 1022db8dac20SDavid S. Miller .setsockopt = udpv6_setsockopt, 1023db8dac20SDavid S. Miller .getsockopt = udpv6_getsockopt, 1024db8dac20SDavid S. Miller .sendmsg = udpv6_sendmsg, 1025db8dac20SDavid S. Miller .recvmsg = udpv6_recvmsg, 1026db8dac20SDavid S. Miller .backlog_rcv = udpv6_queue_rcv_skb, 1027db8dac20SDavid S. Miller .hash = udp_lib_hash, 1028db8dac20SDavid S. Miller .unhash = udp_lib_unhash, 1029db8dac20SDavid S. Miller .get_port = udp_v6_get_port, 1030db8dac20SDavid S. Miller .memory_allocated = &udp_memory_allocated, 1031db8dac20SDavid S. Miller .sysctl_mem = sysctl_udp_mem, 1032db8dac20SDavid S. Miller .sysctl_wmem = &sysctl_udp_wmem_min, 1033db8dac20SDavid S. Miller .sysctl_rmem = &sysctl_udp_rmem_min, 1034db8dac20SDavid S. Miller .obj_size = sizeof(struct udp6_sock), 10356ba5a3c5SPavel Emelyanov .h.udp_hash = udp_hash, 1036db8dac20SDavid S. Miller #ifdef CONFIG_COMPAT 1037db8dac20SDavid S. Miller .compat_setsockopt = compat_udpv6_setsockopt, 1038db8dac20SDavid S. Miller .compat_getsockopt = compat_udpv6_getsockopt, 1039db8dac20SDavid S. Miller #endif 1040db8dac20SDavid S. Miller }; 1041db8dac20SDavid S. Miller 1042db8dac20SDavid S. Miller static struct inet_protosw udpv6_protosw = { 1043db8dac20SDavid S. Miller .type = SOCK_DGRAM, 1044db8dac20SDavid S. Miller .protocol = IPPROTO_UDP, 1045db8dac20SDavid S. Miller .prot = &udpv6_prot, 1046db8dac20SDavid S. Miller .ops = &inet6_dgram_ops, 1047db8dac20SDavid S. Miller .capability =-1, 1048db8dac20SDavid S. Miller .no_check = UDP_CSUM_DEFAULT, 1049db8dac20SDavid S. Miller .flags = INET_PROTOSW_PERMANENT, 1050db8dac20SDavid S. Miller }; 1051db8dac20SDavid S. Miller 1052db8dac20SDavid S. Miller 1053db8dac20SDavid S. Miller int __init udpv6_init(void) 1054db8dac20SDavid S. Miller { 1055db8dac20SDavid S. Miller int ret; 1056db8dac20SDavid S. Miller 1057db8dac20SDavid S. Miller ret = inet6_add_protocol(&udpv6_protocol, IPPROTO_UDP); 1058db8dac20SDavid S. Miller if (ret) 1059db8dac20SDavid S. Miller goto out; 1060db8dac20SDavid S. Miller 1061db8dac20SDavid S. Miller ret = inet6_register_protosw(&udpv6_protosw); 1062db8dac20SDavid S. Miller if (ret) 1063db8dac20SDavid S. Miller goto out_udpv6_protocol; 1064db8dac20SDavid S. Miller out: 1065db8dac20SDavid S. Miller return ret; 1066db8dac20SDavid S. Miller 1067db8dac20SDavid S. Miller out_udpv6_protocol: 1068db8dac20SDavid S. Miller inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP); 1069db8dac20SDavid S. Miller goto out; 1070db8dac20SDavid S. Miller } 1071db8dac20SDavid S. Miller 1072db8dac20SDavid S. Miller void udpv6_exit(void) 1073db8dac20SDavid S. Miller { 1074db8dac20SDavid S. Miller inet6_unregister_protosw(&udpv6_protosw); 1075db8dac20SDavid S. Miller inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP); 1076db8dac20SDavid S. Miller } 1077