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 * $Id: udp.c,v 1.65 2002/02/01 22:01:04 davem Exp $ 11db8dac20SDavid S. Miller * 12db8dac20SDavid S. Miller * Fixes: 13db8dac20SDavid S. Miller * Hideaki YOSHIFUJI : sin6_scope_id support 14db8dac20SDavid S. Miller * YOSHIFUJI Hideaki @USAGI and: Support IPV6_V6ONLY socket option, which 15db8dac20SDavid S. Miller * Alexey Kuznetsov allow both IPv4 and IPv6 sockets to bind 16db8dac20SDavid S. Miller * a single port at the same time. 17db8dac20SDavid S. Miller * Kazunori MIYAZAWA @USAGI: change process style to use ip6_append_data 18db8dac20SDavid S. Miller * YOSHIFUJI Hideaki @USAGI: convert /proc/net/udp6 to seq_file. 19db8dac20SDavid S. Miller * 20db8dac20SDavid S. Miller * This program is free software; you can redistribute it and/or 21db8dac20SDavid S. Miller * modify it under the terms of the GNU General Public License 22db8dac20SDavid S. Miller * as published by the Free Software Foundation; either version 23db8dac20SDavid S. Miller * 2 of the License, or (at your option) any later version. 24db8dac20SDavid S. Miller */ 25db8dac20SDavid S. Miller 26db8dac20SDavid S. Miller #include <linux/errno.h> 27db8dac20SDavid S. Miller #include <linux/types.h> 28db8dac20SDavid S. Miller #include <linux/socket.h> 29db8dac20SDavid S. Miller #include <linux/sockios.h> 30db8dac20SDavid S. Miller #include <linux/net.h> 31db8dac20SDavid S. Miller #include <linux/in6.h> 32db8dac20SDavid S. Miller #include <linux/netdevice.h> 33db8dac20SDavid S. Miller #include <linux/if_arp.h> 34db8dac20SDavid S. Miller #include <linux/ipv6.h> 35db8dac20SDavid S. Miller #include <linux/icmpv6.h> 36db8dac20SDavid S. Miller #include <linux/init.h> 37db8dac20SDavid S. Miller #include <linux/module.h> 38db8dac20SDavid S. Miller #include <linux/skbuff.h> 39db8dac20SDavid S. Miller #include <asm/uaccess.h> 40db8dac20SDavid S. Miller 41db8dac20SDavid S. Miller #include <net/ndisc.h> 42db8dac20SDavid S. Miller #include <net/protocol.h> 43db8dac20SDavid S. Miller #include <net/transp_v6.h> 44db8dac20SDavid S. Miller #include <net/ip6_route.h> 45db8dac20SDavid S. Miller #include <net/raw.h> 46db8dac20SDavid S. Miller #include <net/tcp_states.h> 47db8dac20SDavid S. Miller #include <net/ip6_checksum.h> 48db8dac20SDavid S. Miller #include <net/xfrm.h> 49db8dac20SDavid S. Miller 50db8dac20SDavid S. Miller #include <linux/proc_fs.h> 51db8dac20SDavid S. Miller #include <linux/seq_file.h> 52db8dac20SDavid S. Miller #include "udp_impl.h" 53db8dac20SDavid S. Miller 546ba5a3c5SPavel Emelyanov int udp_v6_get_port(struct sock *sk, unsigned short snum) 55db8dac20SDavid S. Miller { 566ba5a3c5SPavel Emelyanov return udp_lib_get_port(sk, snum, ipv6_rcv_saddr_equal); 57db8dac20SDavid S. Miller } 58db8dac20SDavid S. Miller 59db8dac20SDavid S. Miller static struct sock *__udp6_lib_lookup(struct net *net, 60db8dac20SDavid S. Miller struct in6_addr *saddr, __be16 sport, 61db8dac20SDavid S. Miller struct in6_addr *daddr, __be16 dport, 62db8dac20SDavid S. Miller int dif, struct hlist_head udptable[]) 63db8dac20SDavid S. Miller { 64db8dac20SDavid S. Miller struct sock *sk, *result = NULL; 65db8dac20SDavid S. Miller struct hlist_node *node; 66db8dac20SDavid S. Miller unsigned short hnum = ntohs(dport); 67db8dac20SDavid S. Miller int badness = -1; 68db8dac20SDavid S. Miller 69db8dac20SDavid S. Miller read_lock(&udp_hash_lock); 70db8dac20SDavid S. Miller sk_for_each(sk, node, &udptable[hnum & (UDP_HTABLE_SIZE - 1)]) { 71db8dac20SDavid S. Miller struct inet_sock *inet = inet_sk(sk); 72db8dac20SDavid S. Miller 73db8dac20SDavid S. Miller if (sk->sk_net == net && sk->sk_hash == hnum && 74db8dac20SDavid S. Miller sk->sk_family == PF_INET6) { 75db8dac20SDavid S. Miller struct ipv6_pinfo *np = inet6_sk(sk); 76db8dac20SDavid S. Miller int score = 0; 77db8dac20SDavid S. Miller if (inet->dport) { 78db8dac20SDavid S. Miller if (inet->dport != sport) 79db8dac20SDavid S. Miller continue; 80db8dac20SDavid S. Miller score++; 81db8dac20SDavid S. Miller } 82db8dac20SDavid S. Miller if (!ipv6_addr_any(&np->rcv_saddr)) { 83db8dac20SDavid S. Miller if (!ipv6_addr_equal(&np->rcv_saddr, daddr)) 84db8dac20SDavid S. Miller continue; 85db8dac20SDavid S. Miller score++; 86db8dac20SDavid S. Miller } 87db8dac20SDavid S. Miller if (!ipv6_addr_any(&np->daddr)) { 88db8dac20SDavid S. Miller if (!ipv6_addr_equal(&np->daddr, saddr)) 89db8dac20SDavid S. Miller continue; 90db8dac20SDavid S. Miller score++; 91db8dac20SDavid S. Miller } 92db8dac20SDavid S. Miller if (sk->sk_bound_dev_if) { 93db8dac20SDavid S. Miller if (sk->sk_bound_dev_if != dif) 94db8dac20SDavid S. Miller continue; 95db8dac20SDavid S. Miller score++; 96db8dac20SDavid S. Miller } 97db8dac20SDavid S. Miller if (score == 4) { 98db8dac20SDavid S. Miller result = sk; 99db8dac20SDavid S. Miller break; 100db8dac20SDavid S. Miller } else if (score > badness) { 101db8dac20SDavid S. Miller result = sk; 102db8dac20SDavid S. Miller badness = score; 103db8dac20SDavid S. Miller } 104db8dac20SDavid S. Miller } 105db8dac20SDavid S. Miller } 106db8dac20SDavid S. Miller if (result) 107db8dac20SDavid S. Miller sock_hold(result); 108db8dac20SDavid S. Miller read_unlock(&udp_hash_lock); 109db8dac20SDavid S. Miller return result; 110db8dac20SDavid S. Miller } 111db8dac20SDavid S. Miller 112db8dac20SDavid S. Miller /* 113db8dac20SDavid S. Miller * This should be easy, if there is something there we 114db8dac20SDavid S. Miller * return it, otherwise we block. 115db8dac20SDavid S. Miller */ 116db8dac20SDavid S. Miller 117db8dac20SDavid S. Miller int udpv6_recvmsg(struct kiocb *iocb, struct sock *sk, 118db8dac20SDavid S. Miller struct msghdr *msg, size_t len, 119db8dac20SDavid S. Miller int noblock, int flags, int *addr_len) 120db8dac20SDavid S. Miller { 121db8dac20SDavid S. Miller struct ipv6_pinfo *np = inet6_sk(sk); 122db8dac20SDavid S. Miller struct inet_sock *inet = inet_sk(sk); 123db8dac20SDavid S. Miller struct sk_buff *skb; 124db8dac20SDavid S. Miller unsigned int ulen, copied; 125db8dac20SDavid S. Miller int peeked; 126db8dac20SDavid S. Miller int err; 127db8dac20SDavid S. Miller int is_udplite = IS_UDPLITE(sk); 128db8dac20SDavid S. Miller 129db8dac20SDavid S. Miller if (addr_len) 130db8dac20SDavid S. Miller *addr_len=sizeof(struct sockaddr_in6); 131db8dac20SDavid S. Miller 132db8dac20SDavid S. Miller if (flags & MSG_ERRQUEUE) 133db8dac20SDavid S. Miller return ipv6_recv_error(sk, msg, len); 134db8dac20SDavid S. Miller 135db8dac20SDavid S. Miller try_again: 136db8dac20SDavid S. Miller skb = __skb_recv_datagram(sk, flags | (noblock ? MSG_DONTWAIT : 0), 137db8dac20SDavid S. Miller &peeked, &err); 138db8dac20SDavid S. Miller if (!skb) 139db8dac20SDavid S. Miller goto out; 140db8dac20SDavid S. Miller 141db8dac20SDavid S. Miller ulen = skb->len - sizeof(struct udphdr); 142db8dac20SDavid S. Miller copied = len; 143db8dac20SDavid S. Miller if (copied > ulen) 144db8dac20SDavid S. Miller copied = ulen; 145db8dac20SDavid S. Miller else if (copied < ulen) 146db8dac20SDavid S. Miller msg->msg_flags |= MSG_TRUNC; 147db8dac20SDavid S. Miller 148db8dac20SDavid S. Miller /* 149db8dac20SDavid S. Miller * If checksum is needed at all, try to do it while copying the 150db8dac20SDavid S. Miller * data. If the data is truncated, or if we only want a partial 151db8dac20SDavid S. Miller * coverage checksum (UDP-Lite), do it before the copy. 152db8dac20SDavid S. Miller */ 153db8dac20SDavid S. Miller 154db8dac20SDavid S. Miller if (copied < ulen || UDP_SKB_CB(skb)->partial_cov) { 155db8dac20SDavid S. Miller if (udp_lib_checksum_complete(skb)) 156db8dac20SDavid S. Miller goto csum_copy_err; 157db8dac20SDavid S. Miller } 158db8dac20SDavid S. Miller 159db8dac20SDavid S. Miller if (skb_csum_unnecessary(skb)) 160db8dac20SDavid S. Miller err = skb_copy_datagram_iovec(skb, sizeof(struct udphdr), 161db8dac20SDavid S. Miller msg->msg_iov, copied ); 162db8dac20SDavid S. Miller else { 163db8dac20SDavid S. Miller err = skb_copy_and_csum_datagram_iovec(skb, sizeof(struct udphdr), msg->msg_iov); 164db8dac20SDavid S. Miller if (err == -EINVAL) 165db8dac20SDavid S. Miller goto csum_copy_err; 166db8dac20SDavid S. Miller } 167db8dac20SDavid S. Miller if (err) 168db8dac20SDavid S. Miller goto out_free; 169db8dac20SDavid S. Miller 170db8dac20SDavid S. Miller if (!peeked) 171db8dac20SDavid S. Miller UDP6_INC_STATS_USER(UDP_MIB_INDATAGRAMS, is_udplite); 172db8dac20SDavid S. Miller 173db8dac20SDavid S. Miller sock_recv_timestamp(msg, sk, skb); 174db8dac20SDavid S. Miller 175db8dac20SDavid S. Miller /* Copy the address. */ 176db8dac20SDavid S. Miller if (msg->msg_name) { 177db8dac20SDavid S. Miller struct sockaddr_in6 *sin6; 178db8dac20SDavid S. Miller 179db8dac20SDavid S. Miller sin6 = (struct sockaddr_in6 *) msg->msg_name; 180db8dac20SDavid S. Miller sin6->sin6_family = AF_INET6; 181db8dac20SDavid S. Miller sin6->sin6_port = udp_hdr(skb)->source; 182db8dac20SDavid S. Miller sin6->sin6_flowinfo = 0; 183db8dac20SDavid S. Miller sin6->sin6_scope_id = 0; 184db8dac20SDavid S. Miller 185db8dac20SDavid S. Miller if (skb->protocol == htons(ETH_P_IP)) 186db8dac20SDavid S. Miller ipv6_addr_set(&sin6->sin6_addr, 0, 0, 187db8dac20SDavid S. Miller htonl(0xffff), ip_hdr(skb)->saddr); 188db8dac20SDavid S. Miller else { 189db8dac20SDavid S. Miller ipv6_addr_copy(&sin6->sin6_addr, 190db8dac20SDavid S. Miller &ipv6_hdr(skb)->saddr); 191db8dac20SDavid S. Miller if (ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL) 192db8dac20SDavid S. Miller sin6->sin6_scope_id = IP6CB(skb)->iif; 193db8dac20SDavid S. Miller } 194db8dac20SDavid S. Miller 195db8dac20SDavid S. Miller } 196db8dac20SDavid S. Miller if (skb->protocol == htons(ETH_P_IP)) { 197db8dac20SDavid S. Miller if (inet->cmsg_flags) 198db8dac20SDavid S. Miller ip_cmsg_recv(msg, skb); 199db8dac20SDavid S. Miller } else { 200db8dac20SDavid S. Miller if (np->rxopt.all) 201db8dac20SDavid S. Miller datagram_recv_ctl(sk, msg, skb); 202db8dac20SDavid S. Miller } 203db8dac20SDavid S. Miller 204db8dac20SDavid S. Miller err = copied; 205db8dac20SDavid S. Miller if (flags & MSG_TRUNC) 206db8dac20SDavid S. Miller err = ulen; 207db8dac20SDavid S. Miller 208db8dac20SDavid S. Miller out_free: 209db8dac20SDavid S. Miller lock_sock(sk); 210db8dac20SDavid S. Miller skb_free_datagram(sk, skb); 211db8dac20SDavid S. Miller release_sock(sk); 212db8dac20SDavid S. Miller out: 213db8dac20SDavid S. Miller return err; 214db8dac20SDavid S. Miller 215db8dac20SDavid S. Miller csum_copy_err: 216db8dac20SDavid S. Miller lock_sock(sk); 217db8dac20SDavid S. Miller if (!skb_kill_datagram(sk, skb, flags)) 218db8dac20SDavid S. Miller UDP6_INC_STATS_USER(UDP_MIB_INERRORS, is_udplite); 219db8dac20SDavid S. Miller release_sock(sk); 220db8dac20SDavid S. Miller 221db8dac20SDavid S. Miller if (flags & MSG_DONTWAIT) 222db8dac20SDavid S. Miller return -EAGAIN; 223db8dac20SDavid S. Miller goto try_again; 224db8dac20SDavid S. Miller } 225db8dac20SDavid S. Miller 226db8dac20SDavid S. Miller void __udp6_lib_err(struct sk_buff *skb, struct inet6_skb_parm *opt, 227db8dac20SDavid S. Miller int type, int code, int offset, __be32 info, 228db8dac20SDavid S. Miller struct hlist_head udptable[] ) 229db8dac20SDavid S. Miller { 230db8dac20SDavid S. Miller struct ipv6_pinfo *np; 231db8dac20SDavid S. Miller struct ipv6hdr *hdr = (struct ipv6hdr*)skb->data; 232db8dac20SDavid S. Miller struct in6_addr *saddr = &hdr->saddr; 233db8dac20SDavid S. Miller struct in6_addr *daddr = &hdr->daddr; 234db8dac20SDavid S. Miller struct udphdr *uh = (struct udphdr*)(skb->data+offset); 235db8dac20SDavid S. Miller struct sock *sk; 236db8dac20SDavid S. Miller int err; 237db8dac20SDavid S. Miller 238db8dac20SDavid S. Miller sk = __udp6_lib_lookup(skb->dev->nd_net, daddr, uh->dest, 239db8dac20SDavid S. Miller saddr, uh->source, inet6_iif(skb), udptable); 240db8dac20SDavid S. Miller if (sk == NULL) 241db8dac20SDavid S. Miller return; 242db8dac20SDavid S. Miller 243db8dac20SDavid S. Miller np = inet6_sk(sk); 244db8dac20SDavid S. Miller 245db8dac20SDavid S. Miller if (!icmpv6_err_convert(type, code, &err) && !np->recverr) 246db8dac20SDavid S. Miller goto out; 247db8dac20SDavid S. Miller 248db8dac20SDavid S. Miller if (sk->sk_state != TCP_ESTABLISHED && !np->recverr) 249db8dac20SDavid S. Miller goto out; 250db8dac20SDavid S. Miller 251db8dac20SDavid S. Miller if (np->recverr) 252db8dac20SDavid S. Miller ipv6_icmp_error(sk, skb, err, uh->dest, ntohl(info), (u8 *)(uh+1)); 253db8dac20SDavid S. Miller 254db8dac20SDavid S. Miller sk->sk_err = err; 255db8dac20SDavid S. Miller sk->sk_error_report(sk); 256db8dac20SDavid S. Miller out: 257db8dac20SDavid S. Miller sock_put(sk); 258db8dac20SDavid S. Miller } 259db8dac20SDavid S. Miller 260db8dac20SDavid S. Miller static __inline__ void udpv6_err(struct sk_buff *skb, 261db8dac20SDavid S. Miller struct inet6_skb_parm *opt, int type, 262db8dac20SDavid S. Miller int code, int offset, __be32 info ) 263db8dac20SDavid S. Miller { 264db8dac20SDavid S. Miller __udp6_lib_err(skb, opt, type, code, offset, info, udp_hash); 265db8dac20SDavid S. Miller } 266db8dac20SDavid S. Miller 267db8dac20SDavid S. Miller int udpv6_queue_rcv_skb(struct sock * sk, struct sk_buff *skb) 268db8dac20SDavid S. Miller { 269db8dac20SDavid S. Miller struct udp_sock *up = udp_sk(sk); 270db8dac20SDavid S. Miller int rc; 271db8dac20SDavid S. Miller int is_udplite = IS_UDPLITE(sk); 272db8dac20SDavid S. Miller 273db8dac20SDavid S. Miller if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb)) 274db8dac20SDavid S. Miller goto drop; 275db8dac20SDavid S. Miller 276db8dac20SDavid S. Miller /* 277db8dac20SDavid S. Miller * UDP-Lite specific tests, ignored on UDP sockets (see net/ipv4/udp.c). 278db8dac20SDavid S. Miller */ 279db8dac20SDavid S. Miller if ((is_udplite & UDPLITE_RECV_CC) && UDP_SKB_CB(skb)->partial_cov) { 280db8dac20SDavid S. Miller 281db8dac20SDavid S. Miller if (up->pcrlen == 0) { /* full coverage was set */ 282db8dac20SDavid S. Miller LIMIT_NETDEBUG(KERN_WARNING "UDPLITE6: partial coverage" 283db8dac20SDavid S. Miller " %d while full coverage %d requested\n", 284db8dac20SDavid S. Miller UDP_SKB_CB(skb)->cscov, skb->len); 285db8dac20SDavid S. Miller goto drop; 286db8dac20SDavid S. Miller } 287db8dac20SDavid S. Miller if (UDP_SKB_CB(skb)->cscov < up->pcrlen) { 288db8dac20SDavid S. Miller LIMIT_NETDEBUG(KERN_WARNING "UDPLITE6: coverage %d " 289db8dac20SDavid S. Miller "too small, need min %d\n", 290db8dac20SDavid S. Miller UDP_SKB_CB(skb)->cscov, up->pcrlen); 291db8dac20SDavid S. Miller goto drop; 292db8dac20SDavid S. Miller } 293db8dac20SDavid S. Miller } 294db8dac20SDavid S. Miller 295db8dac20SDavid S. Miller if (sk->sk_filter) { 296db8dac20SDavid S. Miller if (udp_lib_checksum_complete(skb)) 297db8dac20SDavid S. Miller goto drop; 298db8dac20SDavid S. Miller } 299db8dac20SDavid S. Miller 300db8dac20SDavid S. Miller if ((rc = sock_queue_rcv_skb(sk,skb)) < 0) { 301db8dac20SDavid S. Miller /* Note that an ENOMEM error is charged twice */ 302db8dac20SDavid S. Miller if (rc == -ENOMEM) 303db8dac20SDavid S. Miller UDP6_INC_STATS_BH(UDP_MIB_RCVBUFERRORS, is_udplite); 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 326b8ad0cbcSDaniel Lezcano if (s->sk_net != sk->sk_net) 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 */ 358db8dac20SDavid S. Miller static int __udp6_lib_mcast_deliver(struct sk_buff *skb, struct in6_addr *saddr, 359db8dac20SDavid S. Miller struct in6_addr *daddr, struct hlist_head udptable[]) 360db8dac20SDavid S. Miller { 361db8dac20SDavid S. Miller struct sock *sk, *sk2; 362db8dac20SDavid S. Miller const struct udphdr *uh = udp_hdr(skb); 363db8dac20SDavid S. Miller int dif; 364db8dac20SDavid S. Miller 365db8dac20SDavid S. Miller read_lock(&udp_hash_lock); 366db8dac20SDavid S. Miller sk = sk_head(&udptable[ntohs(uh->dest) & (UDP_HTABLE_SIZE - 1)]); 367db8dac20SDavid S. Miller dif = inet6_iif(skb); 368db8dac20SDavid S. Miller sk = udp_v6_mcast_next(sk, uh->dest, daddr, uh->source, saddr, dif); 369db8dac20SDavid S. Miller if (!sk) { 370db8dac20SDavid S. Miller kfree_skb(skb); 371db8dac20SDavid S. Miller goto out; 372db8dac20SDavid S. Miller } 373db8dac20SDavid S. Miller 374db8dac20SDavid S. Miller sk2 = sk; 375db8dac20SDavid S. Miller while ((sk2 = udp_v6_mcast_next(sk_next(sk2), uh->dest, daddr, 376db8dac20SDavid S. Miller uh->source, saddr, dif))) { 377db8dac20SDavid S. Miller struct sk_buff *buff = skb_clone(skb, GFP_ATOMIC); 378db8dac20SDavid S. Miller if (buff) { 379db8dac20SDavid S. Miller bh_lock_sock_nested(sk2); 380db8dac20SDavid S. Miller if (!sock_owned_by_user(sk2)) 381db8dac20SDavid S. Miller udpv6_queue_rcv_skb(sk2, buff); 382db8dac20SDavid S. Miller else 383db8dac20SDavid S. Miller sk_add_backlog(sk2, buff); 384db8dac20SDavid S. Miller bh_unlock_sock(sk2); 385db8dac20SDavid S. Miller } 386db8dac20SDavid S. Miller } 387db8dac20SDavid S. Miller bh_lock_sock_nested(sk); 388db8dac20SDavid S. Miller if (!sock_owned_by_user(sk)) 389db8dac20SDavid S. Miller udpv6_queue_rcv_skb(sk, skb); 390db8dac20SDavid S. Miller else 391db8dac20SDavid S. Miller sk_add_backlog(sk, skb); 392db8dac20SDavid S. Miller bh_unlock_sock(sk); 393db8dac20SDavid S. Miller out: 394db8dac20SDavid S. Miller read_unlock(&udp_hash_lock); 395db8dac20SDavid S. Miller return 0; 396db8dac20SDavid S. Miller } 397db8dac20SDavid S. Miller 398db8dac20SDavid S. Miller static inline int udp6_csum_init(struct sk_buff *skb, struct udphdr *uh, 399db8dac20SDavid S. Miller int proto) 400db8dac20SDavid S. Miller { 401db8dac20SDavid S. Miller int err; 402db8dac20SDavid S. Miller 403db8dac20SDavid S. Miller UDP_SKB_CB(skb)->partial_cov = 0; 404db8dac20SDavid S. Miller UDP_SKB_CB(skb)->cscov = skb->len; 405db8dac20SDavid S. Miller 406db8dac20SDavid S. Miller if (proto == IPPROTO_UDPLITE) { 407db8dac20SDavid S. Miller err = udplite_checksum_init(skb, uh); 408db8dac20SDavid S. Miller if (err) 409db8dac20SDavid S. Miller return err; 410db8dac20SDavid S. Miller } 411db8dac20SDavid S. Miller 412db8dac20SDavid S. Miller if (uh->check == 0) { 413db8dac20SDavid S. Miller /* RFC 2460 section 8.1 says that we SHOULD log 414db8dac20SDavid S. Miller this error. Well, it is reasonable. 415db8dac20SDavid S. Miller */ 416db8dac20SDavid S. Miller LIMIT_NETDEBUG(KERN_INFO "IPv6: udp checksum is 0\n"); 417db8dac20SDavid S. Miller return 1; 418db8dac20SDavid S. Miller } 419db8dac20SDavid S. Miller if (skb->ip_summed == CHECKSUM_COMPLETE && 420db8dac20SDavid S. Miller !csum_ipv6_magic(&ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr, 421db8dac20SDavid S. Miller skb->len, proto, skb->csum)) 422db8dac20SDavid S. Miller skb->ip_summed = CHECKSUM_UNNECESSARY; 423db8dac20SDavid S. Miller 424db8dac20SDavid S. Miller if (!skb_csum_unnecessary(skb)) 425db8dac20SDavid S. Miller skb->csum = ~csum_unfold(csum_ipv6_magic(&ipv6_hdr(skb)->saddr, 426db8dac20SDavid S. Miller &ipv6_hdr(skb)->daddr, 427db8dac20SDavid S. Miller skb->len, proto, 0)); 428db8dac20SDavid S. Miller 429db8dac20SDavid S. Miller return 0; 430db8dac20SDavid S. Miller } 431db8dac20SDavid S. Miller 432db8dac20SDavid S. Miller int __udp6_lib_rcv(struct sk_buff *skb, struct hlist_head udptable[], 433db8dac20SDavid S. Miller int proto) 434db8dac20SDavid S. Miller { 435db8dac20SDavid S. Miller struct sock *sk; 436db8dac20SDavid S. Miller struct udphdr *uh; 437db8dac20SDavid S. Miller struct net_device *dev = skb->dev; 438db8dac20SDavid S. Miller struct in6_addr *saddr, *daddr; 439db8dac20SDavid S. Miller u32 ulen = 0; 440db8dac20SDavid S. Miller 441db8dac20SDavid S. Miller if (!pskb_may_pull(skb, sizeof(struct udphdr))) 442db8dac20SDavid S. Miller goto short_packet; 443db8dac20SDavid S. Miller 444db8dac20SDavid S. Miller saddr = &ipv6_hdr(skb)->saddr; 445db8dac20SDavid S. Miller daddr = &ipv6_hdr(skb)->daddr; 446db8dac20SDavid S. Miller uh = udp_hdr(skb); 447db8dac20SDavid S. Miller 448db8dac20SDavid S. Miller ulen = ntohs(uh->len); 449db8dac20SDavid S. Miller if (ulen > skb->len) 450db8dac20SDavid S. Miller goto short_packet; 451db8dac20SDavid S. Miller 452db8dac20SDavid S. Miller if (proto == IPPROTO_UDP) { 453db8dac20SDavid S. Miller /* UDP validates ulen. */ 454db8dac20SDavid S. Miller 455db8dac20SDavid S. Miller /* Check for jumbo payload */ 456db8dac20SDavid S. Miller if (ulen == 0) 457db8dac20SDavid S. Miller ulen = skb->len; 458db8dac20SDavid S. Miller 459db8dac20SDavid S. Miller if (ulen < sizeof(*uh)) 460db8dac20SDavid S. Miller goto short_packet; 461db8dac20SDavid S. Miller 462db8dac20SDavid S. Miller if (ulen < skb->len) { 463db8dac20SDavid S. Miller if (pskb_trim_rcsum(skb, ulen)) 464db8dac20SDavid S. Miller goto short_packet; 465db8dac20SDavid S. Miller saddr = &ipv6_hdr(skb)->saddr; 466db8dac20SDavid S. Miller daddr = &ipv6_hdr(skb)->daddr; 467db8dac20SDavid S. Miller uh = udp_hdr(skb); 468db8dac20SDavid S. Miller } 469db8dac20SDavid S. Miller } 470db8dac20SDavid S. Miller 471db8dac20SDavid S. Miller if (udp6_csum_init(skb, uh, proto)) 472db8dac20SDavid S. Miller goto discard; 473db8dac20SDavid S. Miller 474db8dac20SDavid S. Miller /* 475db8dac20SDavid S. Miller * Multicast receive code 476db8dac20SDavid S. Miller */ 477db8dac20SDavid S. Miller if (ipv6_addr_is_multicast(daddr)) 478db8dac20SDavid S. Miller return __udp6_lib_mcast_deliver(skb, saddr, daddr, udptable); 479db8dac20SDavid S. Miller 480db8dac20SDavid S. Miller /* Unicast */ 481db8dac20SDavid S. Miller 482db8dac20SDavid S. Miller /* 483db8dac20SDavid S. Miller * check socket cache ... must talk to Alan about his plans 484db8dac20SDavid S. Miller * for sock caches... i'll skip this for now. 485db8dac20SDavid S. Miller */ 486db8dac20SDavid S. Miller sk = __udp6_lib_lookup(skb->dev->nd_net, saddr, uh->source, 487db8dac20SDavid S. Miller daddr, uh->dest, inet6_iif(skb), udptable); 488db8dac20SDavid S. Miller 489db8dac20SDavid S. Miller if (sk == NULL) { 490db8dac20SDavid S. Miller if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) 491db8dac20SDavid S. Miller goto discard; 492db8dac20SDavid S. Miller 493db8dac20SDavid S. Miller if (udp_lib_checksum_complete(skb)) 494db8dac20SDavid S. Miller goto discard; 495db8dac20SDavid S. Miller UDP6_INC_STATS_BH(UDP_MIB_NOPORTS, proto == IPPROTO_UDPLITE); 496db8dac20SDavid S. Miller 497db8dac20SDavid S. Miller icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0, dev); 498db8dac20SDavid S. Miller 499db8dac20SDavid S. Miller kfree_skb(skb); 500db8dac20SDavid S. Miller return 0; 501db8dac20SDavid S. Miller } 502db8dac20SDavid S. Miller 503db8dac20SDavid S. Miller /* deliver */ 504db8dac20SDavid S. Miller 505db8dac20SDavid S. Miller bh_lock_sock_nested(sk); 506db8dac20SDavid S. Miller if (!sock_owned_by_user(sk)) 507db8dac20SDavid S. Miller udpv6_queue_rcv_skb(sk, skb); 508db8dac20SDavid S. Miller else 509db8dac20SDavid S. Miller sk_add_backlog(sk, skb); 510db8dac20SDavid S. Miller bh_unlock_sock(sk); 511db8dac20SDavid S. Miller sock_put(sk); 512db8dac20SDavid S. Miller return 0; 513db8dac20SDavid S. Miller 514db8dac20SDavid S. Miller short_packet: 515db8dac20SDavid S. Miller LIMIT_NETDEBUG(KERN_DEBUG "UDP%sv6: short packet: %d/%u\n", 516db8dac20SDavid S. Miller proto == IPPROTO_UDPLITE ? "-Lite" : "", 517db8dac20SDavid S. Miller ulen, skb->len); 518db8dac20SDavid S. Miller 519db8dac20SDavid S. Miller discard: 520db8dac20SDavid S. Miller UDP6_INC_STATS_BH(UDP_MIB_INERRORS, proto == IPPROTO_UDPLITE); 521db8dac20SDavid S. Miller kfree_skb(skb); 522db8dac20SDavid S. Miller return 0; 523db8dac20SDavid S. Miller } 524db8dac20SDavid S. Miller 525db8dac20SDavid S. Miller static __inline__ int udpv6_rcv(struct sk_buff *skb) 526db8dac20SDavid S. Miller { 527db8dac20SDavid S. Miller return __udp6_lib_rcv(skb, udp_hash, IPPROTO_UDP); 528db8dac20SDavid S. Miller } 529db8dac20SDavid S. Miller 530db8dac20SDavid S. Miller /* 531db8dac20SDavid S. Miller * Throw away all pending data and cancel the corking. Socket is locked. 532db8dac20SDavid S. Miller */ 533db8dac20SDavid S. Miller static void udp_v6_flush_pending_frames(struct sock *sk) 534db8dac20SDavid S. Miller { 535db8dac20SDavid S. Miller struct udp_sock *up = udp_sk(sk); 536db8dac20SDavid S. Miller 537db8dac20SDavid S. Miller if (up->pending) { 538db8dac20SDavid S. Miller up->len = 0; 539db8dac20SDavid S. Miller up->pending = 0; 540db8dac20SDavid S. Miller ip6_flush_pending_frames(sk); 541db8dac20SDavid S. Miller } 542db8dac20SDavid S. Miller } 543db8dac20SDavid S. Miller 544db8dac20SDavid S. Miller /* 545db8dac20SDavid S. Miller * Sending 546db8dac20SDavid S. Miller */ 547db8dac20SDavid S. Miller 548db8dac20SDavid S. Miller static int udp_v6_push_pending_frames(struct sock *sk) 549db8dac20SDavid S. Miller { 550db8dac20SDavid S. Miller struct sk_buff *skb; 551db8dac20SDavid S. Miller struct udphdr *uh; 552db8dac20SDavid S. Miller struct udp_sock *up = udp_sk(sk); 553db8dac20SDavid S. Miller struct inet_sock *inet = inet_sk(sk); 554db8dac20SDavid S. Miller struct flowi *fl = &inet->cork.fl; 555db8dac20SDavid S. Miller int err = 0; 556db8dac20SDavid S. Miller int is_udplite = IS_UDPLITE(sk); 557db8dac20SDavid S. Miller __wsum csum = 0; 558db8dac20SDavid S. Miller 559db8dac20SDavid S. Miller /* Grab the skbuff where UDP header space exists. */ 560db8dac20SDavid S. Miller if ((skb = skb_peek(&sk->sk_write_queue)) == NULL) 561db8dac20SDavid S. Miller goto out; 562db8dac20SDavid S. Miller 563db8dac20SDavid S. Miller /* 564db8dac20SDavid S. Miller * Create a UDP header 565db8dac20SDavid S. Miller */ 566db8dac20SDavid S. Miller uh = udp_hdr(skb); 567db8dac20SDavid S. Miller uh->source = fl->fl_ip_sport; 568db8dac20SDavid S. Miller uh->dest = fl->fl_ip_dport; 569db8dac20SDavid S. Miller uh->len = htons(up->len); 570db8dac20SDavid S. Miller uh->check = 0; 571db8dac20SDavid S. Miller 572db8dac20SDavid S. Miller if (is_udplite) 573db8dac20SDavid S. Miller csum = udplite_csum_outgoing(sk, skb); 574db8dac20SDavid S. Miller else 575db8dac20SDavid S. Miller csum = udp_csum_outgoing(sk, skb); 576db8dac20SDavid S. Miller 577db8dac20SDavid S. Miller /* add protocol-dependent pseudo-header */ 578db8dac20SDavid S. Miller uh->check = csum_ipv6_magic(&fl->fl6_src, &fl->fl6_dst, 579db8dac20SDavid S. Miller up->len, fl->proto, csum ); 580db8dac20SDavid S. Miller if (uh->check == 0) 581db8dac20SDavid S. Miller uh->check = CSUM_MANGLED_0; 582db8dac20SDavid S. Miller 583db8dac20SDavid S. Miller err = ip6_push_pending_frames(sk); 584db8dac20SDavid S. Miller out: 585db8dac20SDavid S. Miller up->len = 0; 586db8dac20SDavid S. Miller up->pending = 0; 587db8dac20SDavid S. Miller if (!err) 588db8dac20SDavid S. Miller UDP6_INC_STATS_USER(UDP_MIB_OUTDATAGRAMS, is_udplite); 589db8dac20SDavid S. Miller return err; 590db8dac20SDavid S. Miller } 591db8dac20SDavid S. Miller 592db8dac20SDavid S. Miller int udpv6_sendmsg(struct kiocb *iocb, struct sock *sk, 593db8dac20SDavid S. Miller struct msghdr *msg, size_t len) 594db8dac20SDavid S. Miller { 595db8dac20SDavid S. Miller struct ipv6_txoptions opt_space; 596db8dac20SDavid S. Miller struct udp_sock *up = udp_sk(sk); 597db8dac20SDavid S. Miller struct inet_sock *inet = inet_sk(sk); 598db8dac20SDavid S. Miller struct ipv6_pinfo *np = inet6_sk(sk); 599db8dac20SDavid S. Miller struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *) msg->msg_name; 600db8dac20SDavid S. Miller struct in6_addr *daddr, *final_p = NULL, final; 601db8dac20SDavid S. Miller struct ipv6_txoptions *opt = NULL; 602db8dac20SDavid S. Miller struct ip6_flowlabel *flowlabel = NULL; 603db8dac20SDavid S. Miller struct flowi fl; 604db8dac20SDavid S. Miller struct dst_entry *dst; 605db8dac20SDavid S. Miller int addr_len = msg->msg_namelen; 606db8dac20SDavid S. Miller int ulen = len; 607db8dac20SDavid S. Miller int hlimit = -1; 608db8dac20SDavid S. Miller int tclass = -1; 609db8dac20SDavid S. Miller int corkreq = up->corkflag || msg->msg_flags&MSG_MORE; 610db8dac20SDavid S. Miller int err; 611db8dac20SDavid S. Miller int connected = 0; 612db8dac20SDavid S. Miller int is_udplite = IS_UDPLITE(sk); 613db8dac20SDavid S. Miller int (*getfrag)(void *, char *, int, int, int, struct sk_buff *); 614db8dac20SDavid S. Miller 615db8dac20SDavid S. Miller /* destination address check */ 616db8dac20SDavid S. Miller if (sin6) { 617db8dac20SDavid S. Miller if (addr_len < offsetof(struct sockaddr, sa_data)) 618db8dac20SDavid S. Miller return -EINVAL; 619db8dac20SDavid S. Miller 620db8dac20SDavid S. Miller switch (sin6->sin6_family) { 621db8dac20SDavid S. Miller case AF_INET6: 622db8dac20SDavid S. Miller if (addr_len < SIN6_LEN_RFC2133) 623db8dac20SDavid S. Miller return -EINVAL; 624db8dac20SDavid S. Miller daddr = &sin6->sin6_addr; 625db8dac20SDavid S. Miller break; 626db8dac20SDavid S. Miller case AF_INET: 627db8dac20SDavid S. Miller goto do_udp_sendmsg; 628db8dac20SDavid S. Miller case AF_UNSPEC: 629db8dac20SDavid S. Miller msg->msg_name = sin6 = NULL; 630db8dac20SDavid S. Miller msg->msg_namelen = addr_len = 0; 631db8dac20SDavid S. Miller daddr = NULL; 632db8dac20SDavid S. Miller break; 633db8dac20SDavid S. Miller default: 634db8dac20SDavid S. Miller return -EINVAL; 635db8dac20SDavid S. Miller } 636db8dac20SDavid S. Miller } else if (!up->pending) { 637db8dac20SDavid S. Miller if (sk->sk_state != TCP_ESTABLISHED) 638db8dac20SDavid S. Miller return -EDESTADDRREQ; 639db8dac20SDavid S. Miller daddr = &np->daddr; 640db8dac20SDavid S. Miller } else 641db8dac20SDavid S. Miller daddr = NULL; 642db8dac20SDavid S. Miller 643db8dac20SDavid S. Miller if (daddr) { 644db8dac20SDavid S. Miller if (ipv6_addr_v4mapped(daddr)) { 645db8dac20SDavid S. Miller struct sockaddr_in sin; 646db8dac20SDavid S. Miller sin.sin_family = AF_INET; 647db8dac20SDavid S. Miller sin.sin_port = sin6 ? sin6->sin6_port : inet->dport; 648db8dac20SDavid S. Miller sin.sin_addr.s_addr = daddr->s6_addr32[3]; 649db8dac20SDavid S. Miller msg->msg_name = &sin; 650db8dac20SDavid S. Miller msg->msg_namelen = sizeof(sin); 651db8dac20SDavid S. Miller do_udp_sendmsg: 652db8dac20SDavid S. Miller if (__ipv6_only_sock(sk)) 653db8dac20SDavid S. Miller return -ENETUNREACH; 654db8dac20SDavid S. Miller return udp_sendmsg(iocb, sk, msg, len); 655db8dac20SDavid S. Miller } 656db8dac20SDavid S. Miller } 657db8dac20SDavid S. Miller 658db8dac20SDavid S. Miller if (up->pending == AF_INET) 659db8dac20SDavid S. Miller return udp_sendmsg(iocb, sk, msg, len); 660db8dac20SDavid S. Miller 661db8dac20SDavid S. Miller /* Rough check on arithmetic overflow, 662db8dac20SDavid S. Miller better check is made in ip6_append_data(). 663db8dac20SDavid S. Miller */ 664db8dac20SDavid S. Miller if (len > INT_MAX - sizeof(struct udphdr)) 665db8dac20SDavid S. Miller return -EMSGSIZE; 666db8dac20SDavid S. Miller 667db8dac20SDavid S. Miller if (up->pending) { 668db8dac20SDavid S. Miller /* 669db8dac20SDavid S. Miller * There are pending frames. 670db8dac20SDavid S. Miller * The socket lock must be held while it's corked. 671db8dac20SDavid S. Miller */ 672db8dac20SDavid S. Miller lock_sock(sk); 673db8dac20SDavid S. Miller if (likely(up->pending)) { 674db8dac20SDavid S. Miller if (unlikely(up->pending != AF_INET6)) { 675db8dac20SDavid S. Miller release_sock(sk); 676db8dac20SDavid S. Miller return -EAFNOSUPPORT; 677db8dac20SDavid S. Miller } 678db8dac20SDavid S. Miller dst = NULL; 679db8dac20SDavid S. Miller goto do_append_data; 680db8dac20SDavid S. Miller } 681db8dac20SDavid S. Miller release_sock(sk); 682db8dac20SDavid S. Miller } 683db8dac20SDavid S. Miller ulen += sizeof(struct udphdr); 684db8dac20SDavid S. Miller 685db8dac20SDavid S. Miller memset(&fl, 0, sizeof(fl)); 686db8dac20SDavid S. Miller 687db8dac20SDavid S. Miller if (sin6) { 688db8dac20SDavid S. Miller if (sin6->sin6_port == 0) 689db8dac20SDavid S. Miller return -EINVAL; 690db8dac20SDavid S. Miller 691db8dac20SDavid S. Miller fl.fl_ip_dport = sin6->sin6_port; 692db8dac20SDavid S. Miller daddr = &sin6->sin6_addr; 693db8dac20SDavid S. Miller 694db8dac20SDavid S. Miller if (np->sndflow) { 695db8dac20SDavid S. Miller fl.fl6_flowlabel = sin6->sin6_flowinfo&IPV6_FLOWINFO_MASK; 696db8dac20SDavid S. Miller if (fl.fl6_flowlabel&IPV6_FLOWLABEL_MASK) { 697db8dac20SDavid S. Miller flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel); 698db8dac20SDavid S. Miller if (flowlabel == NULL) 699db8dac20SDavid S. Miller return -EINVAL; 700db8dac20SDavid S. Miller daddr = &flowlabel->dst; 701db8dac20SDavid S. Miller } 702db8dac20SDavid S. Miller } 703db8dac20SDavid S. Miller 704db8dac20SDavid S. Miller /* 705db8dac20SDavid S. Miller * Otherwise it will be difficult to maintain 706db8dac20SDavid S. Miller * sk->sk_dst_cache. 707db8dac20SDavid S. Miller */ 708db8dac20SDavid S. Miller if (sk->sk_state == TCP_ESTABLISHED && 709db8dac20SDavid S. Miller ipv6_addr_equal(daddr, &np->daddr)) 710db8dac20SDavid S. Miller daddr = &np->daddr; 711db8dac20SDavid S. Miller 712db8dac20SDavid S. Miller if (addr_len >= sizeof(struct sockaddr_in6) && 713db8dac20SDavid S. Miller sin6->sin6_scope_id && 714db8dac20SDavid S. Miller ipv6_addr_type(daddr)&IPV6_ADDR_LINKLOCAL) 715db8dac20SDavid S. Miller fl.oif = sin6->sin6_scope_id; 716db8dac20SDavid S. Miller } else { 717db8dac20SDavid S. Miller if (sk->sk_state != TCP_ESTABLISHED) 718db8dac20SDavid S. Miller return -EDESTADDRREQ; 719db8dac20SDavid S. Miller 720db8dac20SDavid S. Miller fl.fl_ip_dport = inet->dport; 721db8dac20SDavid S. Miller daddr = &np->daddr; 722db8dac20SDavid S. Miller fl.fl6_flowlabel = np->flow_label; 723db8dac20SDavid S. Miller connected = 1; 724db8dac20SDavid S. Miller } 725db8dac20SDavid S. Miller 726db8dac20SDavid S. Miller if (!fl.oif) 727db8dac20SDavid S. Miller fl.oif = sk->sk_bound_dev_if; 728db8dac20SDavid S. Miller 729db8dac20SDavid S. Miller if (msg->msg_controllen) { 730db8dac20SDavid S. Miller opt = &opt_space; 731db8dac20SDavid S. Miller memset(opt, 0, sizeof(struct ipv6_txoptions)); 732db8dac20SDavid S. Miller opt->tot_len = sizeof(*opt); 733db8dac20SDavid S. Miller 734db8dac20SDavid S. Miller err = datagram_send_ctl(msg, &fl, opt, &hlimit, &tclass); 735db8dac20SDavid S. Miller if (err < 0) { 736db8dac20SDavid S. Miller fl6_sock_release(flowlabel); 737db8dac20SDavid S. Miller return err; 738db8dac20SDavid S. Miller } 739db8dac20SDavid S. Miller if ((fl.fl6_flowlabel&IPV6_FLOWLABEL_MASK) && !flowlabel) { 740db8dac20SDavid S. Miller flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel); 741db8dac20SDavid S. Miller if (flowlabel == NULL) 742db8dac20SDavid S. Miller return -EINVAL; 743db8dac20SDavid S. Miller } 744db8dac20SDavid S. Miller if (!(opt->opt_nflen|opt->opt_flen)) 745db8dac20SDavid S. Miller opt = NULL; 746db8dac20SDavid S. Miller connected = 0; 747db8dac20SDavid S. Miller } 748db8dac20SDavid S. Miller if (opt == NULL) 749db8dac20SDavid S. Miller opt = np->opt; 750db8dac20SDavid S. Miller if (flowlabel) 751db8dac20SDavid S. Miller opt = fl6_merge_options(&opt_space, flowlabel, opt); 752db8dac20SDavid S. Miller opt = ipv6_fixup_options(&opt_space, opt); 753db8dac20SDavid S. Miller 754db8dac20SDavid S. Miller fl.proto = sk->sk_protocol; 755db8dac20SDavid S. Miller ipv6_addr_copy(&fl.fl6_dst, daddr); 756db8dac20SDavid S. Miller if (ipv6_addr_any(&fl.fl6_src) && !ipv6_addr_any(&np->saddr)) 757db8dac20SDavid S. Miller ipv6_addr_copy(&fl.fl6_src, &np->saddr); 758db8dac20SDavid S. Miller fl.fl_ip_sport = inet->sport; 759db8dac20SDavid S. Miller 760db8dac20SDavid S. Miller /* merge ip6_build_xmit from ip6_output */ 761db8dac20SDavid S. Miller if (opt && opt->srcrt) { 762db8dac20SDavid S. Miller struct rt0_hdr *rt0 = (struct rt0_hdr *) opt->srcrt; 763db8dac20SDavid S. Miller ipv6_addr_copy(&final, &fl.fl6_dst); 764db8dac20SDavid S. Miller ipv6_addr_copy(&fl.fl6_dst, rt0->addr); 765db8dac20SDavid S. Miller final_p = &final; 766db8dac20SDavid S. Miller connected = 0; 767db8dac20SDavid S. Miller } 768db8dac20SDavid S. Miller 769db8dac20SDavid S. Miller if (!fl.oif && ipv6_addr_is_multicast(&fl.fl6_dst)) { 770db8dac20SDavid S. Miller fl.oif = np->mcast_oif; 771db8dac20SDavid S. Miller connected = 0; 772db8dac20SDavid S. Miller } 773db8dac20SDavid S. Miller 774db8dac20SDavid S. Miller security_sk_classify_flow(sk, &fl); 775db8dac20SDavid S. Miller 776db8dac20SDavid S. Miller err = ip6_sk_dst_lookup(sk, &dst, &fl); 777db8dac20SDavid S. Miller if (err) 778db8dac20SDavid S. Miller goto out; 779db8dac20SDavid S. Miller if (final_p) 780db8dac20SDavid S. Miller ipv6_addr_copy(&fl.fl6_dst, final_p); 781db8dac20SDavid S. Miller 782db8dac20SDavid S. Miller if ((err = __xfrm_lookup(&dst, &fl, sk, XFRM_LOOKUP_WAIT)) < 0) { 783db8dac20SDavid S. Miller if (err == -EREMOTE) 784db8dac20SDavid S. Miller err = ip6_dst_blackhole(sk, &dst, &fl); 785db8dac20SDavid S. Miller if (err < 0) 786db8dac20SDavid S. Miller goto out; 787db8dac20SDavid S. Miller } 788db8dac20SDavid S. Miller 789db8dac20SDavid S. Miller if (hlimit < 0) { 790db8dac20SDavid S. Miller if (ipv6_addr_is_multicast(&fl.fl6_dst)) 791db8dac20SDavid S. Miller hlimit = np->mcast_hops; 792db8dac20SDavid S. Miller else 793db8dac20SDavid S. Miller hlimit = np->hop_limit; 794db8dac20SDavid S. Miller if (hlimit < 0) 795db8dac20SDavid S. Miller hlimit = dst_metric(dst, RTAX_HOPLIMIT); 796db8dac20SDavid S. Miller if (hlimit < 0) 797db8dac20SDavid S. Miller hlimit = ipv6_get_hoplimit(dst->dev); 798db8dac20SDavid S. Miller } 799db8dac20SDavid S. Miller 800db8dac20SDavid S. Miller if (tclass < 0) { 801db8dac20SDavid S. Miller tclass = np->tclass; 802db8dac20SDavid S. Miller if (tclass < 0) 803db8dac20SDavid S. Miller tclass = 0; 804db8dac20SDavid S. Miller } 805db8dac20SDavid S. Miller 806db8dac20SDavid S. Miller if (msg->msg_flags&MSG_CONFIRM) 807db8dac20SDavid S. Miller goto do_confirm; 808db8dac20SDavid S. Miller back_from_confirm: 809db8dac20SDavid S. Miller 810db8dac20SDavid S. Miller lock_sock(sk); 811db8dac20SDavid S. Miller if (unlikely(up->pending)) { 812db8dac20SDavid S. Miller /* The socket is already corked while preparing it. */ 813db8dac20SDavid S. Miller /* ... which is an evident application bug. --ANK */ 814db8dac20SDavid S. Miller release_sock(sk); 815db8dac20SDavid S. Miller 816db8dac20SDavid S. Miller LIMIT_NETDEBUG(KERN_DEBUG "udp cork app bug 2\n"); 817db8dac20SDavid S. Miller err = -EINVAL; 818db8dac20SDavid S. Miller goto out; 819db8dac20SDavid S. Miller } 820db8dac20SDavid S. Miller 821db8dac20SDavid S. Miller up->pending = AF_INET6; 822db8dac20SDavid S. Miller 823db8dac20SDavid S. Miller do_append_data: 824db8dac20SDavid S. Miller up->len += ulen; 825db8dac20SDavid S. Miller getfrag = is_udplite ? udplite_getfrag : ip_generic_getfrag; 826db8dac20SDavid S. Miller err = ip6_append_data(sk, getfrag, msg->msg_iov, ulen, 827db8dac20SDavid S. Miller sizeof(struct udphdr), hlimit, tclass, opt, &fl, 828db8dac20SDavid S. Miller (struct rt6_info*)dst, 829db8dac20SDavid S. Miller corkreq ? msg->msg_flags|MSG_MORE : msg->msg_flags); 830db8dac20SDavid S. Miller if (err) 831db8dac20SDavid S. Miller udp_v6_flush_pending_frames(sk); 832db8dac20SDavid S. Miller else if (!corkreq) 833db8dac20SDavid S. Miller err = udp_v6_push_pending_frames(sk); 834db8dac20SDavid S. Miller else if (unlikely(skb_queue_empty(&sk->sk_write_queue))) 835db8dac20SDavid S. Miller up->pending = 0; 836db8dac20SDavid S. Miller 837db8dac20SDavid S. Miller if (dst) { 838db8dac20SDavid S. Miller if (connected) { 839db8dac20SDavid S. Miller ip6_dst_store(sk, dst, 840db8dac20SDavid S. Miller ipv6_addr_equal(&fl.fl6_dst, &np->daddr) ? 841db8dac20SDavid S. Miller &np->daddr : NULL, 842db8dac20SDavid S. Miller #ifdef CONFIG_IPV6_SUBTREES 843db8dac20SDavid S. Miller ipv6_addr_equal(&fl.fl6_src, &np->saddr) ? 844db8dac20SDavid S. Miller &np->saddr : 845db8dac20SDavid S. Miller #endif 846db8dac20SDavid S. Miller NULL); 847db8dac20SDavid S. Miller } else { 848db8dac20SDavid S. Miller dst_release(dst); 849db8dac20SDavid S. Miller } 850db8dac20SDavid S. Miller } 851db8dac20SDavid S. Miller 852db8dac20SDavid S. Miller if (err > 0) 853db8dac20SDavid S. Miller err = np->recverr ? net_xmit_errno(err) : 0; 854db8dac20SDavid S. Miller release_sock(sk); 855db8dac20SDavid S. Miller out: 856db8dac20SDavid S. Miller fl6_sock_release(flowlabel); 857db8dac20SDavid S. Miller if (!err) 858db8dac20SDavid S. Miller return len; 859db8dac20SDavid S. Miller /* 860db8dac20SDavid S. Miller * ENOBUFS = no kernel mem, SOCK_NOSPACE = no sndbuf space. Reporting 861db8dac20SDavid S. Miller * ENOBUFS might not be good (it's not tunable per se), but otherwise 862db8dac20SDavid S. Miller * we don't have a good statistic (IpOutDiscards but it can be too many 863db8dac20SDavid S. Miller * things). We could add another new stat but at least for now that 864db8dac20SDavid S. Miller * seems like overkill. 865db8dac20SDavid S. Miller */ 866db8dac20SDavid S. Miller if (err == -ENOBUFS || test_bit(SOCK_NOSPACE, &sk->sk_socket->flags)) { 867db8dac20SDavid S. Miller UDP6_INC_STATS_USER(UDP_MIB_SNDBUFERRORS, is_udplite); 868db8dac20SDavid S. Miller } 869db8dac20SDavid S. Miller return err; 870db8dac20SDavid S. Miller 871db8dac20SDavid S. Miller do_confirm: 872db8dac20SDavid S. Miller dst_confirm(dst); 873db8dac20SDavid S. Miller if (!(msg->msg_flags&MSG_PROBE) || len) 874db8dac20SDavid S. Miller goto back_from_confirm; 875db8dac20SDavid S. Miller err = 0; 876db8dac20SDavid S. Miller goto out; 877db8dac20SDavid S. Miller } 878db8dac20SDavid S. Miller 879db8dac20SDavid S. Miller int udpv6_destroy_sock(struct sock *sk) 880db8dac20SDavid S. Miller { 881db8dac20SDavid S. Miller lock_sock(sk); 882db8dac20SDavid S. Miller udp_v6_flush_pending_frames(sk); 883db8dac20SDavid S. Miller release_sock(sk); 884db8dac20SDavid S. Miller 885db8dac20SDavid S. Miller inet6_destroy_sock(sk); 886db8dac20SDavid S. Miller 887db8dac20SDavid S. Miller return 0; 888db8dac20SDavid S. Miller } 889db8dac20SDavid S. Miller 890db8dac20SDavid S. Miller /* 891db8dac20SDavid S. Miller * Socket option code for UDP 892db8dac20SDavid S. Miller */ 893db8dac20SDavid S. Miller int udpv6_setsockopt(struct sock *sk, int level, int optname, 894db8dac20SDavid S. Miller char __user *optval, int optlen) 895db8dac20SDavid S. Miller { 896db8dac20SDavid S. Miller if (level == SOL_UDP || level == SOL_UDPLITE) 897db8dac20SDavid S. Miller return udp_lib_setsockopt(sk, level, optname, optval, optlen, 898db8dac20SDavid S. Miller udp_v6_push_pending_frames); 899db8dac20SDavid S. Miller return ipv6_setsockopt(sk, level, optname, optval, optlen); 900db8dac20SDavid S. Miller } 901db8dac20SDavid S. Miller 902db8dac20SDavid S. Miller #ifdef CONFIG_COMPAT 903db8dac20SDavid S. Miller int compat_udpv6_setsockopt(struct sock *sk, int level, int optname, 904db8dac20SDavid S. Miller char __user *optval, int optlen) 905db8dac20SDavid S. Miller { 906db8dac20SDavid S. Miller if (level == SOL_UDP || level == SOL_UDPLITE) 907db8dac20SDavid S. Miller return udp_lib_setsockopt(sk, level, optname, optval, optlen, 908db8dac20SDavid S. Miller udp_v6_push_pending_frames); 909db8dac20SDavid S. Miller return compat_ipv6_setsockopt(sk, level, optname, optval, optlen); 910db8dac20SDavid S. Miller } 911db8dac20SDavid S. Miller #endif 912db8dac20SDavid S. Miller 913db8dac20SDavid S. Miller int udpv6_getsockopt(struct sock *sk, int level, int optname, 914db8dac20SDavid S. Miller char __user *optval, int __user *optlen) 915db8dac20SDavid S. Miller { 916db8dac20SDavid S. Miller if (level == SOL_UDP || level == SOL_UDPLITE) 917db8dac20SDavid S. Miller return udp_lib_getsockopt(sk, level, optname, optval, optlen); 918db8dac20SDavid S. Miller return ipv6_getsockopt(sk, level, optname, optval, optlen); 919db8dac20SDavid S. Miller } 920db8dac20SDavid S. Miller 921db8dac20SDavid S. Miller #ifdef CONFIG_COMPAT 922db8dac20SDavid S. Miller int compat_udpv6_getsockopt(struct sock *sk, int level, int optname, 923db8dac20SDavid S. Miller char __user *optval, int __user *optlen) 924db8dac20SDavid S. Miller { 925db8dac20SDavid S. Miller if (level == SOL_UDP || level == SOL_UDPLITE) 926db8dac20SDavid S. Miller return udp_lib_getsockopt(sk, level, optname, optval, optlen); 927db8dac20SDavid S. Miller return compat_ipv6_getsockopt(sk, level, optname, optval, optlen); 928db8dac20SDavid S. Miller } 929db8dac20SDavid S. Miller #endif 930db8dac20SDavid S. Miller 931db8dac20SDavid S. Miller static struct inet6_protocol udpv6_protocol = { 932db8dac20SDavid S. Miller .handler = udpv6_rcv, 933db8dac20SDavid S. Miller .err_handler = udpv6_err, 934db8dac20SDavid S. Miller .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL, 935db8dac20SDavid S. Miller }; 936db8dac20SDavid S. Miller 937db8dac20SDavid S. Miller /* ------------------------------------------------------------------------ */ 938db8dac20SDavid S. Miller #ifdef CONFIG_PROC_FS 939db8dac20SDavid S. Miller 940db8dac20SDavid S. Miller static void udp6_sock_seq_show(struct seq_file *seq, struct sock *sp, int bucket) 941db8dac20SDavid S. Miller { 942db8dac20SDavid S. Miller struct inet_sock *inet = inet_sk(sp); 943db8dac20SDavid S. Miller struct ipv6_pinfo *np = inet6_sk(sp); 944db8dac20SDavid S. Miller struct in6_addr *dest, *src; 945db8dac20SDavid S. Miller __u16 destp, srcp; 946db8dac20SDavid S. Miller 947db8dac20SDavid S. Miller dest = &np->daddr; 948db8dac20SDavid S. Miller src = &np->rcv_saddr; 949db8dac20SDavid S. Miller destp = ntohs(inet->dport); 950db8dac20SDavid S. Miller srcp = ntohs(inet->sport); 951db8dac20SDavid S. Miller seq_printf(seq, 952db8dac20SDavid S. Miller "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X " 953db8dac20SDavid S. Miller "%02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %p\n", 954db8dac20SDavid S. Miller bucket, 955db8dac20SDavid S. Miller src->s6_addr32[0], src->s6_addr32[1], 956db8dac20SDavid S. Miller src->s6_addr32[2], src->s6_addr32[3], srcp, 957db8dac20SDavid S. Miller dest->s6_addr32[0], dest->s6_addr32[1], 958db8dac20SDavid S. Miller dest->s6_addr32[2], dest->s6_addr32[3], destp, 959db8dac20SDavid S. Miller sp->sk_state, 960db8dac20SDavid S. Miller atomic_read(&sp->sk_wmem_alloc), 961db8dac20SDavid S. Miller atomic_read(&sp->sk_rmem_alloc), 962db8dac20SDavid S. Miller 0, 0L, 0, 963db8dac20SDavid S. Miller sock_i_uid(sp), 0, 964db8dac20SDavid S. Miller sock_i_ino(sp), 965db8dac20SDavid S. Miller atomic_read(&sp->sk_refcnt), sp); 966db8dac20SDavid S. Miller } 967db8dac20SDavid S. Miller 968db8dac20SDavid S. Miller int udp6_seq_show(struct seq_file *seq, void *v) 969db8dac20SDavid S. Miller { 970db8dac20SDavid S. Miller if (v == SEQ_START_TOKEN) 971db8dac20SDavid S. Miller seq_printf(seq, 972db8dac20SDavid S. Miller " sl " 973db8dac20SDavid S. Miller "local_address " 974db8dac20SDavid S. Miller "remote_address " 975db8dac20SDavid S. Miller "st tx_queue rx_queue tr tm->when retrnsmt" 976db8dac20SDavid S. Miller " uid timeout inode\n"); 977db8dac20SDavid S. Miller else 978db8dac20SDavid S. Miller udp6_sock_seq_show(seq, v, ((struct udp_iter_state *)seq->private)->bucket); 979db8dac20SDavid S. Miller return 0; 980db8dac20SDavid S. Miller } 981db8dac20SDavid S. Miller 982db8dac20SDavid S. Miller static struct file_operations udp6_seq_fops; 983db8dac20SDavid S. Miller static struct udp_seq_afinfo udp6_seq_afinfo = { 984db8dac20SDavid S. Miller .owner = THIS_MODULE, 985db8dac20SDavid S. Miller .name = "udp6", 986db8dac20SDavid S. Miller .family = AF_INET6, 987db8dac20SDavid S. Miller .hashtable = udp_hash, 988db8dac20SDavid S. Miller .seq_show = udp6_seq_show, 989db8dac20SDavid S. Miller .seq_fops = &udp6_seq_fops, 990db8dac20SDavid S. Miller }; 991db8dac20SDavid S. Miller 9920c96d8c5SDaniel Lezcano int udp6_proc_init(struct net *net) 993db8dac20SDavid S. Miller { 9940c96d8c5SDaniel Lezcano return udp_proc_register(net, &udp6_seq_afinfo); 995db8dac20SDavid S. Miller } 996db8dac20SDavid S. Miller 9970c96d8c5SDaniel Lezcano void udp6_proc_exit(struct net *net) { 9980c96d8c5SDaniel Lezcano udp_proc_unregister(net, &udp6_seq_afinfo); 999db8dac20SDavid S. Miller } 1000db8dac20SDavid S. Miller #endif /* CONFIG_PROC_FS */ 1001db8dac20SDavid S. Miller 1002db8dac20SDavid S. Miller /* ------------------------------------------------------------------------ */ 1003db8dac20SDavid S. Miller 1004db8dac20SDavid S. Miller DEFINE_PROTO_INUSE(udpv6) 1005db8dac20SDavid S. Miller 1006db8dac20SDavid S. Miller struct proto udpv6_prot = { 1007db8dac20SDavid S. Miller .name = "UDPv6", 1008db8dac20SDavid S. Miller .owner = THIS_MODULE, 1009db8dac20SDavid S. Miller .close = udp_lib_close, 1010db8dac20SDavid S. Miller .connect = ip6_datagram_connect, 1011db8dac20SDavid S. Miller .disconnect = udp_disconnect, 1012db8dac20SDavid S. Miller .ioctl = udp_ioctl, 1013db8dac20SDavid S. Miller .destroy = udpv6_destroy_sock, 1014db8dac20SDavid S. Miller .setsockopt = udpv6_setsockopt, 1015db8dac20SDavid S. Miller .getsockopt = udpv6_getsockopt, 1016db8dac20SDavid S. Miller .sendmsg = udpv6_sendmsg, 1017db8dac20SDavid S. Miller .recvmsg = udpv6_recvmsg, 1018db8dac20SDavid S. Miller .backlog_rcv = udpv6_queue_rcv_skb, 1019db8dac20SDavid S. Miller .hash = udp_lib_hash, 1020db8dac20SDavid S. Miller .unhash = udp_lib_unhash, 1021db8dac20SDavid S. Miller .get_port = udp_v6_get_port, 1022db8dac20SDavid S. Miller .memory_allocated = &udp_memory_allocated, 1023db8dac20SDavid S. Miller .sysctl_mem = sysctl_udp_mem, 1024db8dac20SDavid S. Miller .sysctl_wmem = &sysctl_udp_wmem_min, 1025db8dac20SDavid S. Miller .sysctl_rmem = &sysctl_udp_rmem_min, 1026db8dac20SDavid S. Miller .obj_size = sizeof(struct udp6_sock), 10276ba5a3c5SPavel Emelyanov .h.udp_hash = udp_hash, 1028db8dac20SDavid S. Miller #ifdef CONFIG_COMPAT 1029db8dac20SDavid S. Miller .compat_setsockopt = compat_udpv6_setsockopt, 1030db8dac20SDavid S. Miller .compat_getsockopt = compat_udpv6_getsockopt, 1031db8dac20SDavid S. Miller #endif 1032db8dac20SDavid S. Miller REF_PROTO_INUSE(udpv6) 1033db8dac20SDavid S. Miller }; 1034db8dac20SDavid S. Miller 1035db8dac20SDavid S. Miller static struct inet_protosw udpv6_protosw = { 1036db8dac20SDavid S. Miller .type = SOCK_DGRAM, 1037db8dac20SDavid S. Miller .protocol = IPPROTO_UDP, 1038db8dac20SDavid S. Miller .prot = &udpv6_prot, 1039db8dac20SDavid S. Miller .ops = &inet6_dgram_ops, 1040db8dac20SDavid S. Miller .capability =-1, 1041db8dac20SDavid S. Miller .no_check = UDP_CSUM_DEFAULT, 1042db8dac20SDavid S. Miller .flags = INET_PROTOSW_PERMANENT, 1043db8dac20SDavid S. Miller }; 1044db8dac20SDavid S. Miller 1045db8dac20SDavid S. Miller 1046db8dac20SDavid S. Miller int __init udpv6_init(void) 1047db8dac20SDavid S. Miller { 1048db8dac20SDavid S. Miller int ret; 1049db8dac20SDavid S. Miller 1050db8dac20SDavid S. Miller ret = inet6_add_protocol(&udpv6_protocol, IPPROTO_UDP); 1051db8dac20SDavid S. Miller if (ret) 1052db8dac20SDavid S. Miller goto out; 1053db8dac20SDavid S. Miller 1054db8dac20SDavid S. Miller ret = inet6_register_protosw(&udpv6_protosw); 1055db8dac20SDavid S. Miller if (ret) 1056db8dac20SDavid S. Miller goto out_udpv6_protocol; 1057db8dac20SDavid S. Miller out: 1058db8dac20SDavid S. Miller return ret; 1059db8dac20SDavid S. Miller 1060db8dac20SDavid S. Miller out_udpv6_protocol: 1061db8dac20SDavid S. Miller inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP); 1062db8dac20SDavid S. Miller goto out; 1063db8dac20SDavid S. Miller } 1064db8dac20SDavid S. Miller 1065db8dac20SDavid S. Miller void udpv6_exit(void) 1066db8dac20SDavid S. Miller { 1067db8dac20SDavid S. Miller inet6_unregister_protosw(&udpv6_protosw); 1068db8dac20SDavid S. Miller inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP); 1069db8dac20SDavid S. Miller } 1070