11da177e4SLinus Torvalds /* SCTP kernel reference Implementation 21da177e4SLinus Torvalds * (C) Copyright IBM Corp. 2002, 2004 31da177e4SLinus Torvalds * Copyright (c) 2001 Nokia, Inc. 41da177e4SLinus Torvalds * Copyright (c) 2001 La Monte H.P. Yarroll 51da177e4SLinus Torvalds * Copyright (c) 2002-2003 Intel Corp. 61da177e4SLinus Torvalds * 71da177e4SLinus Torvalds * This file is part of the SCTP kernel reference Implementation 81da177e4SLinus Torvalds * 91da177e4SLinus Torvalds * SCTP over IPv6. 101da177e4SLinus Torvalds * 111da177e4SLinus Torvalds * The SCTP reference implementation is free software; 121da177e4SLinus Torvalds * you can redistribute it and/or modify it under the terms of 131da177e4SLinus Torvalds * the GNU General Public License as published by 141da177e4SLinus Torvalds * the Free Software Foundation; either version 2, or (at your option) 151da177e4SLinus Torvalds * any later version. 161da177e4SLinus Torvalds * 171da177e4SLinus Torvalds * The SCTP reference implementation is distributed in the hope that it 181da177e4SLinus Torvalds * will be useful, but WITHOUT ANY WARRANTY; without even the implied 191da177e4SLinus Torvalds * ************************ 201da177e4SLinus Torvalds * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. 211da177e4SLinus Torvalds * See the GNU General Public License for more details. 221da177e4SLinus Torvalds * 231da177e4SLinus Torvalds * You should have received a copy of the GNU General Public License 241da177e4SLinus Torvalds * along with GNU CC; see the file COPYING. If not, write to 251da177e4SLinus Torvalds * the Free Software Foundation, 59 Temple Place - Suite 330, 261da177e4SLinus Torvalds * Boston, MA 02111-1307, USA. 271da177e4SLinus Torvalds * 281da177e4SLinus Torvalds * Please send any bug reports or fixes you make to the 291da177e4SLinus Torvalds * email address(es): 301da177e4SLinus Torvalds * lksctp developers <lksctp-developers@lists.sourceforge.net> 311da177e4SLinus Torvalds * 321da177e4SLinus Torvalds * Or submit a bug report through the following website: 331da177e4SLinus Torvalds * http://www.sf.net/projects/lksctp 341da177e4SLinus Torvalds * 351da177e4SLinus Torvalds * Written or modified by: 361da177e4SLinus Torvalds * Le Yanqun <yanqun.le@nokia.com> 371da177e4SLinus Torvalds * Hui Huang <hui.huang@nokia.com> 381da177e4SLinus Torvalds * La Monte H.P. Yarroll <piggy@acm.org> 391da177e4SLinus Torvalds * Sridhar Samudrala <sri@us.ibm.com> 401da177e4SLinus Torvalds * Jon Grimm <jgrimm@us.ibm.com> 411da177e4SLinus Torvalds * Ardelle Fan <ardelle.fan@intel.com> 421da177e4SLinus Torvalds * 431da177e4SLinus Torvalds * Based on: 441da177e4SLinus Torvalds * linux/net/ipv6/tcp_ipv6.c 451da177e4SLinus Torvalds * 461da177e4SLinus Torvalds * Any bugs reported given to us we will try to fix... any fixes shared will 471da177e4SLinus Torvalds * be incorporated into the next SCTP release. 481da177e4SLinus Torvalds */ 491da177e4SLinus Torvalds 501da177e4SLinus Torvalds #include <linux/module.h> 511da177e4SLinus Torvalds #include <linux/errno.h> 521da177e4SLinus Torvalds #include <linux/types.h> 531da177e4SLinus Torvalds #include <linux/socket.h> 541da177e4SLinus Torvalds #include <linux/sockios.h> 551da177e4SLinus Torvalds #include <linux/net.h> 561da177e4SLinus Torvalds #include <linux/sched.h> 571da177e4SLinus Torvalds #include <linux/in.h> 581da177e4SLinus Torvalds #include <linux/in6.h> 591da177e4SLinus Torvalds #include <linux/netdevice.h> 601da177e4SLinus Torvalds #include <linux/init.h> 611da177e4SLinus Torvalds #include <linux/ipsec.h> 621da177e4SLinus Torvalds 631da177e4SLinus Torvalds #include <linux/ipv6.h> 641da177e4SLinus Torvalds #include <linux/icmpv6.h> 651da177e4SLinus Torvalds #include <linux/random.h> 661da177e4SLinus Torvalds #include <linux/seq_file.h> 671da177e4SLinus Torvalds 681da177e4SLinus Torvalds #include <net/protocol.h> 691da177e4SLinus Torvalds #include <net/tcp.h> 701da177e4SLinus Torvalds #include <net/ndisc.h> 711da177e4SLinus Torvalds #include <net/ipv6.h> 721da177e4SLinus Torvalds #include <net/transp_v6.h> 731da177e4SLinus Torvalds #include <net/addrconf.h> 741da177e4SLinus Torvalds #include <net/ip6_route.h> 751da177e4SLinus Torvalds #include <net/inet_common.h> 761da177e4SLinus Torvalds #include <net/inet_ecn.h> 771da177e4SLinus Torvalds #include <net/sctp/sctp.h> 781da177e4SLinus Torvalds 791da177e4SLinus Torvalds #include <asm/uaccess.h> 801da177e4SLinus Torvalds 811da177e4SLinus Torvalds extern int sctp_inetaddr_event(struct notifier_block *, unsigned long, void *); 821da177e4SLinus Torvalds static struct notifier_block sctp_inet6addr_notifier = { 831da177e4SLinus Torvalds .notifier_call = sctp_inetaddr_event, 841da177e4SLinus Torvalds }; 851da177e4SLinus Torvalds 861da177e4SLinus Torvalds /* ICMP error handler. */ 871da177e4SLinus Torvalds SCTP_STATIC void sctp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, 881da177e4SLinus Torvalds int type, int code, int offset, __u32 info) 891da177e4SLinus Torvalds { 901da177e4SLinus Torvalds struct inet6_dev *idev; 911da177e4SLinus Torvalds struct ipv6hdr *iph = (struct ipv6hdr *)skb->data; 921da177e4SLinus Torvalds struct sctphdr *sh = (struct sctphdr *)(skb->data + offset); 931da177e4SLinus Torvalds struct sock *sk; 941da177e4SLinus Torvalds struct sctp_association *asoc; 951da177e4SLinus Torvalds struct sctp_transport *transport; 961da177e4SLinus Torvalds struct ipv6_pinfo *np; 971da177e4SLinus Torvalds char *saveip, *savesctp; 981da177e4SLinus Torvalds int err; 991da177e4SLinus Torvalds 1001da177e4SLinus Torvalds idev = in6_dev_get(skb->dev); 1011da177e4SLinus Torvalds 1021da177e4SLinus Torvalds /* Fix up skb to look at the embedded net header. */ 1031da177e4SLinus Torvalds saveip = skb->nh.raw; 1041da177e4SLinus Torvalds savesctp = skb->h.raw; 1051da177e4SLinus Torvalds skb->nh.ipv6h = iph; 1061da177e4SLinus Torvalds skb->h.raw = (char *)sh; 107d1ad1ff2SSridhar Samudrala sk = sctp_err_lookup(AF_INET6, skb, sh, &asoc, &transport); 1081da177e4SLinus Torvalds /* Put back, the original pointers. */ 1091da177e4SLinus Torvalds skb->nh.raw = saveip; 1101da177e4SLinus Torvalds skb->h.raw = savesctp; 1111da177e4SLinus Torvalds if (!sk) { 1121da177e4SLinus Torvalds ICMP6_INC_STATS_BH(idev, ICMP6_MIB_INERRORS); 1131da177e4SLinus Torvalds goto out; 1141da177e4SLinus Torvalds } 1151da177e4SLinus Torvalds 1161da177e4SLinus Torvalds /* Warning: The sock lock is held. Remember to call 1171da177e4SLinus Torvalds * sctp_err_finish! 1181da177e4SLinus Torvalds */ 1191da177e4SLinus Torvalds 1201da177e4SLinus Torvalds switch (type) { 1211da177e4SLinus Torvalds case ICMPV6_PKT_TOOBIG: 1221da177e4SLinus Torvalds sctp_icmp_frag_needed(sk, asoc, transport, ntohl(info)); 1231da177e4SLinus Torvalds goto out_unlock; 1241da177e4SLinus Torvalds case ICMPV6_PARAMPROB: 1251da177e4SLinus Torvalds if (ICMPV6_UNK_NEXTHDR == code) { 126d1ad1ff2SSridhar Samudrala sctp_icmp_proto_unreachable(sk, asoc, transport); 1271da177e4SLinus Torvalds goto out_unlock; 1281da177e4SLinus Torvalds } 1291da177e4SLinus Torvalds break; 1301da177e4SLinus Torvalds default: 1311da177e4SLinus Torvalds break; 1321da177e4SLinus Torvalds } 1331da177e4SLinus Torvalds 1341da177e4SLinus Torvalds np = inet6_sk(sk); 1351da177e4SLinus Torvalds icmpv6_err_convert(type, code, &err); 1361da177e4SLinus Torvalds if (!sock_owned_by_user(sk) && np->recverr) { 1371da177e4SLinus Torvalds sk->sk_err = err; 1381da177e4SLinus Torvalds sk->sk_error_report(sk); 1391da177e4SLinus Torvalds } else { /* Only an error on timeout */ 1401da177e4SLinus Torvalds sk->sk_err_soft = err; 1411da177e4SLinus Torvalds } 1421da177e4SLinus Torvalds 1431da177e4SLinus Torvalds out_unlock: 144d1ad1ff2SSridhar Samudrala sctp_err_finish(sk, asoc); 1451da177e4SLinus Torvalds out: 1461da177e4SLinus Torvalds if (likely(idev != NULL)) 1471da177e4SLinus Torvalds in6_dev_put(idev); 1481da177e4SLinus Torvalds } 1491da177e4SLinus Torvalds 1501da177e4SLinus Torvalds /* Based on tcp_v6_xmit() in tcp_ipv6.c. */ 1511da177e4SLinus Torvalds static int sctp_v6_xmit(struct sk_buff *skb, struct sctp_transport *transport, 1521da177e4SLinus Torvalds int ipfragok) 1531da177e4SLinus Torvalds { 1541da177e4SLinus Torvalds struct sock *sk = skb->sk; 1551da177e4SLinus Torvalds struct ipv6_pinfo *np = inet6_sk(sk); 1561da177e4SLinus Torvalds struct flowi fl; 1571da177e4SLinus Torvalds 1581da177e4SLinus Torvalds memset(&fl, 0, sizeof(fl)); 1591da177e4SLinus Torvalds 1601da177e4SLinus Torvalds fl.proto = sk->sk_protocol; 1611da177e4SLinus Torvalds 1621da177e4SLinus Torvalds /* Fill in the dest address from the route entry passed with the skb 1631da177e4SLinus Torvalds * and the source address from the transport. 1641da177e4SLinus Torvalds */ 1651da177e4SLinus Torvalds ipv6_addr_copy(&fl.fl6_dst, &transport->ipaddr.v6.sin6_addr); 1661da177e4SLinus Torvalds ipv6_addr_copy(&fl.fl6_src, &transport->saddr.v6.sin6_addr); 1671da177e4SLinus Torvalds 1681da177e4SLinus Torvalds fl.fl6_flowlabel = np->flow_label; 1691da177e4SLinus Torvalds IP6_ECN_flow_xmit(sk, fl.fl6_flowlabel); 1701da177e4SLinus Torvalds if (ipv6_addr_type(&fl.fl6_src) & IPV6_ADDR_LINKLOCAL) 1711da177e4SLinus Torvalds fl.oif = transport->saddr.v6.sin6_scope_id; 1721da177e4SLinus Torvalds else 1731da177e4SLinus Torvalds fl.oif = sk->sk_bound_dev_if; 1741da177e4SLinus Torvalds fl.fl_ip_sport = inet_sk(sk)->sport; 1751da177e4SLinus Torvalds fl.fl_ip_dport = transport->ipaddr.v6.sin6_port; 1761da177e4SLinus Torvalds 1771da177e4SLinus Torvalds if (np->opt && np->opt->srcrt) { 1781da177e4SLinus Torvalds struct rt0_hdr *rt0 = (struct rt0_hdr *) np->opt->srcrt; 1791da177e4SLinus Torvalds ipv6_addr_copy(&fl.fl6_dst, rt0->addr); 1801da177e4SLinus Torvalds } 1811da177e4SLinus Torvalds 1821da177e4SLinus Torvalds SCTP_DEBUG_PRINTK("%s: skb:%p, len:%d, " 1831da177e4SLinus Torvalds "src:%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x " 1841da177e4SLinus Torvalds "dst:%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x\n", 1851da177e4SLinus Torvalds __FUNCTION__, skb, skb->len, 1861da177e4SLinus Torvalds NIP6(fl.fl6_src), NIP6(fl.fl6_dst)); 1871da177e4SLinus Torvalds 1881da177e4SLinus Torvalds SCTP_INC_STATS(SCTP_MIB_OUTSCTPPACKS); 1891da177e4SLinus Torvalds 1901da177e4SLinus Torvalds return ip6_xmit(sk, skb, &fl, np->opt, ipfragok); 1911da177e4SLinus Torvalds } 1921da177e4SLinus Torvalds 1931da177e4SLinus Torvalds /* Returns the dst cache entry for the given source and destination ip 1941da177e4SLinus Torvalds * addresses. 1951da177e4SLinus Torvalds */ 1961da177e4SLinus Torvalds static struct dst_entry *sctp_v6_get_dst(struct sctp_association *asoc, 1971da177e4SLinus Torvalds union sctp_addr *daddr, 1981da177e4SLinus Torvalds union sctp_addr *saddr) 1991da177e4SLinus Torvalds { 2001da177e4SLinus Torvalds struct dst_entry *dst; 2011da177e4SLinus Torvalds struct flowi fl; 2021da177e4SLinus Torvalds 2031da177e4SLinus Torvalds memset(&fl, 0, sizeof(fl)); 2041da177e4SLinus Torvalds ipv6_addr_copy(&fl.fl6_dst, &daddr->v6.sin6_addr); 2051da177e4SLinus Torvalds if (ipv6_addr_type(&daddr->v6.sin6_addr) & IPV6_ADDR_LINKLOCAL) 2061da177e4SLinus Torvalds fl.oif = daddr->v6.sin6_scope_id; 2071da177e4SLinus Torvalds 2081da177e4SLinus Torvalds 2091da177e4SLinus Torvalds SCTP_DEBUG_PRINTK("%s: DST=%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x ", 2101da177e4SLinus Torvalds __FUNCTION__, NIP6(fl.fl6_dst)); 2111da177e4SLinus Torvalds 2121da177e4SLinus Torvalds if (saddr) { 2131da177e4SLinus Torvalds ipv6_addr_copy(&fl.fl6_src, &saddr->v6.sin6_addr); 2141da177e4SLinus Torvalds SCTP_DEBUG_PRINTK( 2151da177e4SLinus Torvalds "SRC=%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x - ", 2161da177e4SLinus Torvalds NIP6(fl.fl6_src)); 2171da177e4SLinus Torvalds } 2181da177e4SLinus Torvalds 2191da177e4SLinus Torvalds dst = ip6_route_output(NULL, &fl); 2201da177e4SLinus Torvalds if (dst) { 2211da177e4SLinus Torvalds struct rt6_info *rt; 2221da177e4SLinus Torvalds rt = (struct rt6_info *)dst; 2231da177e4SLinus Torvalds SCTP_DEBUG_PRINTK( 2241da177e4SLinus Torvalds "rt6_dst:%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x " 2251da177e4SLinus Torvalds "rt6_src:%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x\n", 2261da177e4SLinus Torvalds NIP6(rt->rt6i_dst.addr), NIP6(rt->rt6i_src.addr)); 2271da177e4SLinus Torvalds } else { 2281da177e4SLinus Torvalds SCTP_DEBUG_PRINTK("NO ROUTE\n"); 2291da177e4SLinus Torvalds } 2301da177e4SLinus Torvalds 2311da177e4SLinus Torvalds return dst; 2321da177e4SLinus Torvalds } 2331da177e4SLinus Torvalds 2341da177e4SLinus Torvalds /* Returns the number of consecutive initial bits that match in the 2 ipv6 2351da177e4SLinus Torvalds * addresses. 2361da177e4SLinus Torvalds */ 2371da177e4SLinus Torvalds static inline int sctp_v6_addr_match_len(union sctp_addr *s1, 2381da177e4SLinus Torvalds union sctp_addr *s2) 2391da177e4SLinus Torvalds { 2401da177e4SLinus Torvalds struct in6_addr *a1 = &s1->v6.sin6_addr; 2411da177e4SLinus Torvalds struct in6_addr *a2 = &s2->v6.sin6_addr; 2421da177e4SLinus Torvalds int i, j; 2431da177e4SLinus Torvalds 2441da177e4SLinus Torvalds for (i = 0; i < 4 ; i++) { 2451da177e4SLinus Torvalds __u32 a1xora2; 2461da177e4SLinus Torvalds 2471da177e4SLinus Torvalds a1xora2 = a1->s6_addr32[i] ^ a2->s6_addr32[i]; 2481da177e4SLinus Torvalds 2491da177e4SLinus Torvalds if ((j = fls(ntohl(a1xora2)))) 2501da177e4SLinus Torvalds return (i * 32 + 32 - j); 2511da177e4SLinus Torvalds } 2521da177e4SLinus Torvalds 2531da177e4SLinus Torvalds return (i*32); 2541da177e4SLinus Torvalds } 2551da177e4SLinus Torvalds 2561da177e4SLinus Torvalds /* Fills in the source address(saddr) based on the destination address(daddr) 2571da177e4SLinus Torvalds * and asoc's bind address list. 2581da177e4SLinus Torvalds */ 2591da177e4SLinus Torvalds static void sctp_v6_get_saddr(struct sctp_association *asoc, 2601da177e4SLinus Torvalds struct dst_entry *dst, 2611da177e4SLinus Torvalds union sctp_addr *daddr, 2621da177e4SLinus Torvalds union sctp_addr *saddr) 2631da177e4SLinus Torvalds { 2641da177e4SLinus Torvalds struct sctp_bind_addr *bp; 2651da177e4SLinus Torvalds rwlock_t *addr_lock; 2661da177e4SLinus Torvalds struct sctp_sockaddr_entry *laddr; 2671da177e4SLinus Torvalds struct list_head *pos; 2681da177e4SLinus Torvalds sctp_scope_t scope; 2691da177e4SLinus Torvalds union sctp_addr *baddr = NULL; 2701da177e4SLinus Torvalds __u8 matchlen = 0; 2711da177e4SLinus Torvalds __u8 bmatchlen; 2721da177e4SLinus Torvalds 2731da177e4SLinus Torvalds SCTP_DEBUG_PRINTK("%s: asoc:%p dst:%p " 2741da177e4SLinus Torvalds "daddr:%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x ", 2751da177e4SLinus Torvalds __FUNCTION__, asoc, dst, NIP6(daddr->v6.sin6_addr)); 2761da177e4SLinus Torvalds 2771da177e4SLinus Torvalds if (!asoc) { 2781da177e4SLinus Torvalds ipv6_get_saddr(dst, &daddr->v6.sin6_addr,&saddr->v6.sin6_addr); 2791da177e4SLinus Torvalds SCTP_DEBUG_PRINTK("saddr from ipv6_get_saddr: " 2801da177e4SLinus Torvalds "%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x\n", 2811da177e4SLinus Torvalds NIP6(saddr->v6.sin6_addr)); 2821da177e4SLinus Torvalds return; 2831da177e4SLinus Torvalds } 2841da177e4SLinus Torvalds 2851da177e4SLinus Torvalds scope = sctp_scope(daddr); 2861da177e4SLinus Torvalds 2871da177e4SLinus Torvalds bp = &asoc->base.bind_addr; 2881da177e4SLinus Torvalds addr_lock = &asoc->base.addr_lock; 2891da177e4SLinus Torvalds 2901da177e4SLinus Torvalds /* Go through the bind address list and find the best source address 2911da177e4SLinus Torvalds * that matches the scope of the destination address. 2921da177e4SLinus Torvalds */ 2931da177e4SLinus Torvalds sctp_read_lock(addr_lock); 2941da177e4SLinus Torvalds list_for_each(pos, &bp->address_list) { 2951da177e4SLinus Torvalds laddr = list_entry(pos, struct sctp_sockaddr_entry, list); 2961da177e4SLinus Torvalds if ((laddr->a.sa.sa_family == AF_INET6) && 2971da177e4SLinus Torvalds (scope <= sctp_scope(&laddr->a))) { 2981da177e4SLinus Torvalds bmatchlen = sctp_v6_addr_match_len(daddr, &laddr->a); 2991da177e4SLinus Torvalds if (!baddr || (matchlen < bmatchlen)) { 3001da177e4SLinus Torvalds baddr = &laddr->a; 3011da177e4SLinus Torvalds matchlen = bmatchlen; 3021da177e4SLinus Torvalds } 3031da177e4SLinus Torvalds } 3041da177e4SLinus Torvalds } 3051da177e4SLinus Torvalds 3061da177e4SLinus Torvalds if (baddr) { 3071da177e4SLinus Torvalds memcpy(saddr, baddr, sizeof(union sctp_addr)); 3081da177e4SLinus Torvalds SCTP_DEBUG_PRINTK("saddr: " 3091da177e4SLinus Torvalds "%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x\n", 3101da177e4SLinus Torvalds NIP6(saddr->v6.sin6_addr)); 3111da177e4SLinus Torvalds } else { 3121da177e4SLinus Torvalds printk(KERN_ERR "%s: asoc:%p Could not find a valid source " 3131da177e4SLinus Torvalds "address for the " 3141da177e4SLinus Torvalds "dest:%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x\n", 3151da177e4SLinus Torvalds __FUNCTION__, asoc, NIP6(daddr->v6.sin6_addr)); 3161da177e4SLinus Torvalds } 3171da177e4SLinus Torvalds 3181da177e4SLinus Torvalds sctp_read_unlock(addr_lock); 3191da177e4SLinus Torvalds } 3201da177e4SLinus Torvalds 3211da177e4SLinus Torvalds /* Make a copy of all potential local addresses. */ 3221da177e4SLinus Torvalds static void sctp_v6_copy_addrlist(struct list_head *addrlist, 3231da177e4SLinus Torvalds struct net_device *dev) 3241da177e4SLinus Torvalds { 3251da177e4SLinus Torvalds struct inet6_dev *in6_dev; 3261da177e4SLinus Torvalds struct inet6_ifaddr *ifp; 3271da177e4SLinus Torvalds struct sctp_sockaddr_entry *addr; 3281da177e4SLinus Torvalds 3291da177e4SLinus Torvalds read_lock(&addrconf_lock); 3301da177e4SLinus Torvalds if ((in6_dev = __in6_dev_get(dev)) == NULL) { 3311da177e4SLinus Torvalds read_unlock(&addrconf_lock); 3321da177e4SLinus Torvalds return; 3331da177e4SLinus Torvalds } 3341da177e4SLinus Torvalds 3351da177e4SLinus Torvalds read_lock(&in6_dev->lock); 3361da177e4SLinus Torvalds for (ifp = in6_dev->addr_list; ifp; ifp = ifp->if_next) { 3371da177e4SLinus Torvalds /* Add the address to the local list. */ 3381da177e4SLinus Torvalds addr = t_new(struct sctp_sockaddr_entry, GFP_ATOMIC); 3391da177e4SLinus Torvalds if (addr) { 3401da177e4SLinus Torvalds addr->a.v6.sin6_family = AF_INET6; 3411da177e4SLinus Torvalds addr->a.v6.sin6_port = 0; 3421da177e4SLinus Torvalds addr->a.v6.sin6_addr = ifp->addr; 3431da177e4SLinus Torvalds addr->a.v6.sin6_scope_id = dev->ifindex; 3441da177e4SLinus Torvalds INIT_LIST_HEAD(&addr->list); 3451da177e4SLinus Torvalds list_add_tail(&addr->list, addrlist); 3461da177e4SLinus Torvalds } 3471da177e4SLinus Torvalds } 3481da177e4SLinus Torvalds 3491da177e4SLinus Torvalds read_unlock(&in6_dev->lock); 3501da177e4SLinus Torvalds read_unlock(&addrconf_lock); 3511da177e4SLinus Torvalds } 3521da177e4SLinus Torvalds 3531da177e4SLinus Torvalds /* Initialize a sockaddr_storage from in incoming skb. */ 3541da177e4SLinus Torvalds static void sctp_v6_from_skb(union sctp_addr *addr,struct sk_buff *skb, 3551da177e4SLinus Torvalds int is_saddr) 3561da177e4SLinus Torvalds { 3571da177e4SLinus Torvalds void *from; 3581da177e4SLinus Torvalds __u16 *port; 3591da177e4SLinus Torvalds struct sctphdr *sh; 3601da177e4SLinus Torvalds 3611da177e4SLinus Torvalds port = &addr->v6.sin6_port; 3621da177e4SLinus Torvalds addr->v6.sin6_family = AF_INET6; 3631da177e4SLinus Torvalds addr->v6.sin6_flowinfo = 0; /* FIXME */ 3641da177e4SLinus Torvalds addr->v6.sin6_scope_id = ((struct inet6_skb_parm *)skb->cb)->iif; 3651da177e4SLinus Torvalds 3661da177e4SLinus Torvalds sh = (struct sctphdr *) skb->h.raw; 3671da177e4SLinus Torvalds if (is_saddr) { 3681da177e4SLinus Torvalds *port = ntohs(sh->source); 3691da177e4SLinus Torvalds from = &skb->nh.ipv6h->saddr; 3701da177e4SLinus Torvalds } else { 3711da177e4SLinus Torvalds *port = ntohs(sh->dest); 3721da177e4SLinus Torvalds from = &skb->nh.ipv6h->daddr; 3731da177e4SLinus Torvalds } 3741da177e4SLinus Torvalds ipv6_addr_copy(&addr->v6.sin6_addr, from); 3751da177e4SLinus Torvalds } 3761da177e4SLinus Torvalds 3771da177e4SLinus Torvalds /* Initialize an sctp_addr from a socket. */ 3781da177e4SLinus Torvalds static void sctp_v6_from_sk(union sctp_addr *addr, struct sock *sk) 3791da177e4SLinus Torvalds { 3801da177e4SLinus Torvalds addr->v6.sin6_family = AF_INET6; 3811da177e4SLinus Torvalds addr->v6.sin6_port = inet_sk(sk)->num; 3821da177e4SLinus Torvalds addr->v6.sin6_addr = inet6_sk(sk)->rcv_saddr; 3831da177e4SLinus Torvalds } 3841da177e4SLinus Torvalds 3851da177e4SLinus Torvalds /* Initialize sk->sk_rcv_saddr from sctp_addr. */ 3861da177e4SLinus Torvalds static void sctp_v6_to_sk_saddr(union sctp_addr *addr, struct sock *sk) 3871da177e4SLinus Torvalds { 3881da177e4SLinus Torvalds if (addr->sa.sa_family == AF_INET && sctp_sk(sk)->v4mapped) { 3891da177e4SLinus Torvalds inet6_sk(sk)->rcv_saddr.s6_addr32[0] = 0; 3901da177e4SLinus Torvalds inet6_sk(sk)->rcv_saddr.s6_addr32[1] = 0; 3911da177e4SLinus Torvalds inet6_sk(sk)->rcv_saddr.s6_addr32[2] = htonl(0x0000ffff); 3921da177e4SLinus Torvalds inet6_sk(sk)->rcv_saddr.s6_addr32[3] = 3931da177e4SLinus Torvalds addr->v4.sin_addr.s_addr; 3941da177e4SLinus Torvalds } else { 3951da177e4SLinus Torvalds inet6_sk(sk)->rcv_saddr = addr->v6.sin6_addr; 3961da177e4SLinus Torvalds } 3971da177e4SLinus Torvalds } 3981da177e4SLinus Torvalds 3991da177e4SLinus Torvalds /* Initialize sk->sk_daddr from sctp_addr. */ 4001da177e4SLinus Torvalds static void sctp_v6_to_sk_daddr(union sctp_addr *addr, struct sock *sk) 4011da177e4SLinus Torvalds { 4021da177e4SLinus Torvalds if (addr->sa.sa_family == AF_INET && sctp_sk(sk)->v4mapped) { 4031da177e4SLinus Torvalds inet6_sk(sk)->daddr.s6_addr32[0] = 0; 4041da177e4SLinus Torvalds inet6_sk(sk)->daddr.s6_addr32[1] = 0; 4051da177e4SLinus Torvalds inet6_sk(sk)->daddr.s6_addr32[2] = htonl(0x0000ffff); 4061da177e4SLinus Torvalds inet6_sk(sk)->daddr.s6_addr32[3] = addr->v4.sin_addr.s_addr; 4071da177e4SLinus Torvalds } else { 4081da177e4SLinus Torvalds inet6_sk(sk)->daddr = addr->v6.sin6_addr; 4091da177e4SLinus Torvalds } 4101da177e4SLinus Torvalds } 4111da177e4SLinus Torvalds 4121da177e4SLinus Torvalds /* Initialize a sctp_addr from an address parameter. */ 4131da177e4SLinus Torvalds static void sctp_v6_from_addr_param(union sctp_addr *addr, 4141da177e4SLinus Torvalds union sctp_addr_param *param, 4151da177e4SLinus Torvalds __u16 port, int iif) 4161da177e4SLinus Torvalds { 4171da177e4SLinus Torvalds addr->v6.sin6_family = AF_INET6; 4181da177e4SLinus Torvalds addr->v6.sin6_port = port; 4191da177e4SLinus Torvalds addr->v6.sin6_flowinfo = 0; /* BUG */ 4201da177e4SLinus Torvalds ipv6_addr_copy(&addr->v6.sin6_addr, ¶m->v6.addr); 4211da177e4SLinus Torvalds addr->v6.sin6_scope_id = iif; 4221da177e4SLinus Torvalds } 4231da177e4SLinus Torvalds 4241da177e4SLinus Torvalds /* Initialize an address parameter from a sctp_addr and return the length 4251da177e4SLinus Torvalds * of the address parameter. 4261da177e4SLinus Torvalds */ 4271da177e4SLinus Torvalds static int sctp_v6_to_addr_param(const union sctp_addr *addr, 4281da177e4SLinus Torvalds union sctp_addr_param *param) 4291da177e4SLinus Torvalds { 4301da177e4SLinus Torvalds int length = sizeof(sctp_ipv6addr_param_t); 4311da177e4SLinus Torvalds 4321da177e4SLinus Torvalds param->v6.param_hdr.type = SCTP_PARAM_IPV6_ADDRESS; 4331da177e4SLinus Torvalds param->v6.param_hdr.length = ntohs(length); 4341da177e4SLinus Torvalds ipv6_addr_copy(¶m->v6.addr, &addr->v6.sin6_addr); 4351da177e4SLinus Torvalds 4361da177e4SLinus Torvalds return length; 4371da177e4SLinus Torvalds } 4381da177e4SLinus Torvalds 4391da177e4SLinus Torvalds /* Initialize a sctp_addr from a dst_entry. */ 4401da177e4SLinus Torvalds static void sctp_v6_dst_saddr(union sctp_addr *addr, struct dst_entry *dst, 4411da177e4SLinus Torvalds unsigned short port) 4421da177e4SLinus Torvalds { 4431da177e4SLinus Torvalds struct rt6_info *rt = (struct rt6_info *)dst; 4441da177e4SLinus Torvalds addr->sa.sa_family = AF_INET6; 4451da177e4SLinus Torvalds addr->v6.sin6_port = port; 4461da177e4SLinus Torvalds ipv6_addr_copy(&addr->v6.sin6_addr, &rt->rt6i_src.addr); 4471da177e4SLinus Torvalds } 4481da177e4SLinus Torvalds 4491da177e4SLinus Torvalds /* Compare addresses exactly. 4501da177e4SLinus Torvalds * v4-mapped-v6 is also in consideration. 4511da177e4SLinus Torvalds */ 4521da177e4SLinus Torvalds static int sctp_v6_cmp_addr(const union sctp_addr *addr1, 4531da177e4SLinus Torvalds const union sctp_addr *addr2) 4541da177e4SLinus Torvalds { 4551da177e4SLinus Torvalds if (addr1->sa.sa_family != addr2->sa.sa_family) { 4561da177e4SLinus Torvalds if (addr1->sa.sa_family == AF_INET && 4571da177e4SLinus Torvalds addr2->sa.sa_family == AF_INET6 && 4581da177e4SLinus Torvalds IPV6_ADDR_MAPPED == ipv6_addr_type(&addr2->v6.sin6_addr)) { 4591da177e4SLinus Torvalds if (addr2->v6.sin6_port == addr1->v4.sin_port && 4601da177e4SLinus Torvalds addr2->v6.sin6_addr.s6_addr32[3] == 4611da177e4SLinus Torvalds addr1->v4.sin_addr.s_addr) 4621da177e4SLinus Torvalds return 1; 4631da177e4SLinus Torvalds } 4641da177e4SLinus Torvalds if (addr2->sa.sa_family == AF_INET && 4651da177e4SLinus Torvalds addr1->sa.sa_family == AF_INET6 && 4661da177e4SLinus Torvalds IPV6_ADDR_MAPPED == ipv6_addr_type(&addr1->v6.sin6_addr)) { 4671da177e4SLinus Torvalds if (addr1->v6.sin6_port == addr2->v4.sin_port && 4681da177e4SLinus Torvalds addr1->v6.sin6_addr.s6_addr32[3] == 4691da177e4SLinus Torvalds addr2->v4.sin_addr.s_addr) 4701da177e4SLinus Torvalds return 1; 4711da177e4SLinus Torvalds } 4721da177e4SLinus Torvalds return 0; 4731da177e4SLinus Torvalds } 4741da177e4SLinus Torvalds if (!ipv6_addr_equal(&addr1->v6.sin6_addr, &addr2->v6.sin6_addr)) 4751da177e4SLinus Torvalds return 0; 4761da177e4SLinus Torvalds /* If this is a linklocal address, compare the scope_id. */ 4771da177e4SLinus Torvalds if (ipv6_addr_type(&addr1->v6.sin6_addr) & IPV6_ADDR_LINKLOCAL) { 4781da177e4SLinus Torvalds if (addr1->v6.sin6_scope_id && addr2->v6.sin6_scope_id && 4791da177e4SLinus Torvalds (addr1->v6.sin6_scope_id != addr2->v6.sin6_scope_id)) { 4801da177e4SLinus Torvalds return 0; 4811da177e4SLinus Torvalds } 4821da177e4SLinus Torvalds } 4831da177e4SLinus Torvalds 4841da177e4SLinus Torvalds return 1; 4851da177e4SLinus Torvalds } 4861da177e4SLinus Torvalds 4871da177e4SLinus Torvalds /* Initialize addr struct to INADDR_ANY. */ 4881da177e4SLinus Torvalds static void sctp_v6_inaddr_any(union sctp_addr *addr, unsigned short port) 4891da177e4SLinus Torvalds { 4901da177e4SLinus Torvalds memset(addr, 0x00, sizeof(union sctp_addr)); 4911da177e4SLinus Torvalds addr->v6.sin6_family = AF_INET6; 4921da177e4SLinus Torvalds addr->v6.sin6_port = port; 4931da177e4SLinus Torvalds } 4941da177e4SLinus Torvalds 4951da177e4SLinus Torvalds /* Is this a wildcard address? */ 4961da177e4SLinus Torvalds static int sctp_v6_is_any(const union sctp_addr *addr) 4971da177e4SLinus Torvalds { 498b9b9e10fSBrian Haley return ipv6_addr_any(&addr->v6.sin6_addr); 4991da177e4SLinus Torvalds } 5001da177e4SLinus Torvalds 5011da177e4SLinus Torvalds /* Should this be available for binding? */ 5021da177e4SLinus Torvalds static int sctp_v6_available(union sctp_addr *addr, struct sctp_sock *sp) 5031da177e4SLinus Torvalds { 5041da177e4SLinus Torvalds int type; 5051da177e4SLinus Torvalds struct in6_addr *in6 = (struct in6_addr *)&addr->v6.sin6_addr; 5061da177e4SLinus Torvalds 5071da177e4SLinus Torvalds type = ipv6_addr_type(in6); 5081da177e4SLinus Torvalds if (IPV6_ADDR_ANY == type) 5091da177e4SLinus Torvalds return 1; 5101da177e4SLinus Torvalds if (type == IPV6_ADDR_MAPPED) { 5111da177e4SLinus Torvalds if (sp && !sp->v4mapped) 5121da177e4SLinus Torvalds return 0; 5131da177e4SLinus Torvalds if (sp && ipv6_only_sock(sctp_opt2sk(sp))) 5141da177e4SLinus Torvalds return 0; 5151da177e4SLinus Torvalds sctp_v6_map_v4(addr); 5161da177e4SLinus Torvalds return sctp_get_af_specific(AF_INET)->available(addr, sp); 5171da177e4SLinus Torvalds } 5181da177e4SLinus Torvalds if (!(type & IPV6_ADDR_UNICAST)) 5191da177e4SLinus Torvalds return 0; 5201da177e4SLinus Torvalds 5211da177e4SLinus Torvalds return ipv6_chk_addr(in6, NULL, 0); 5221da177e4SLinus Torvalds } 5231da177e4SLinus Torvalds 5241da177e4SLinus Torvalds /* This function checks if the address is a valid address to be used for 5251da177e4SLinus Torvalds * SCTP. 5261da177e4SLinus Torvalds * 5271da177e4SLinus Torvalds * Output: 5281da177e4SLinus Torvalds * Return 0 - If the address is a non-unicast or an illegal address. 5291da177e4SLinus Torvalds * Return 1 - If the address is a unicast. 5301da177e4SLinus Torvalds */ 5311da177e4SLinus Torvalds static int sctp_v6_addr_valid(union sctp_addr *addr, struct sctp_sock *sp) 5321da177e4SLinus Torvalds { 5331da177e4SLinus Torvalds int ret = ipv6_addr_type(&addr->v6.sin6_addr); 5341da177e4SLinus Torvalds 5351da177e4SLinus Torvalds /* Support v4-mapped-v6 address. */ 5361da177e4SLinus Torvalds if (ret == IPV6_ADDR_MAPPED) { 5371da177e4SLinus Torvalds /* Note: This routine is used in input, so v4-mapped-v6 5381da177e4SLinus Torvalds * are disallowed here when there is no sctp_sock. 5391da177e4SLinus Torvalds */ 5401da177e4SLinus Torvalds if (!sp || !sp->v4mapped) 5411da177e4SLinus Torvalds return 0; 5421da177e4SLinus Torvalds if (sp && ipv6_only_sock(sctp_opt2sk(sp))) 5431da177e4SLinus Torvalds return 0; 5441da177e4SLinus Torvalds sctp_v6_map_v4(addr); 5451da177e4SLinus Torvalds return sctp_get_af_specific(AF_INET)->addr_valid(addr, sp); 5461da177e4SLinus Torvalds } 5471da177e4SLinus Torvalds 5481da177e4SLinus Torvalds /* Is this a non-unicast address */ 5491da177e4SLinus Torvalds if (!(ret & IPV6_ADDR_UNICAST)) 5501da177e4SLinus Torvalds return 0; 5511da177e4SLinus Torvalds 5521da177e4SLinus Torvalds return 1; 5531da177e4SLinus Torvalds } 5541da177e4SLinus Torvalds 5551da177e4SLinus Torvalds /* What is the scope of 'addr'? */ 5561da177e4SLinus Torvalds static sctp_scope_t sctp_v6_scope(union sctp_addr *addr) 5571da177e4SLinus Torvalds { 5581da177e4SLinus Torvalds int v6scope; 5591da177e4SLinus Torvalds sctp_scope_t retval; 5601da177e4SLinus Torvalds 5611da177e4SLinus Torvalds /* The IPv6 scope is really a set of bit fields. 5621da177e4SLinus Torvalds * See IFA_* in <net/if_inet6.h>. Map to a generic SCTP scope. 5631da177e4SLinus Torvalds */ 5641da177e4SLinus Torvalds 5651da177e4SLinus Torvalds v6scope = ipv6_addr_scope(&addr->v6.sin6_addr); 5661da177e4SLinus Torvalds switch (v6scope) { 5671da177e4SLinus Torvalds case IFA_HOST: 5681da177e4SLinus Torvalds retval = SCTP_SCOPE_LOOPBACK; 5691da177e4SLinus Torvalds break; 5701da177e4SLinus Torvalds case IFA_LINK: 5711da177e4SLinus Torvalds retval = SCTP_SCOPE_LINK; 5721da177e4SLinus Torvalds break; 5731da177e4SLinus Torvalds case IFA_SITE: 5741da177e4SLinus Torvalds retval = SCTP_SCOPE_PRIVATE; 5751da177e4SLinus Torvalds break; 5761da177e4SLinus Torvalds default: 5771da177e4SLinus Torvalds retval = SCTP_SCOPE_GLOBAL; 5781da177e4SLinus Torvalds break; 5791da177e4SLinus Torvalds }; 5801da177e4SLinus Torvalds 5811da177e4SLinus Torvalds return retval; 5821da177e4SLinus Torvalds } 5831da177e4SLinus Torvalds 5841da177e4SLinus Torvalds /* Create and initialize a new sk for the socket to be returned by accept(). */ 5851da177e4SLinus Torvalds static struct sock *sctp_v6_create_accept_sk(struct sock *sk, 5861da177e4SLinus Torvalds struct sctp_association *asoc) 5871da177e4SLinus Torvalds { 5881da177e4SLinus Torvalds struct inet_sock *inet = inet_sk(sk); 5891da177e4SLinus Torvalds struct sock *newsk; 5901da177e4SLinus Torvalds struct inet_sock *newinet; 5911da177e4SLinus Torvalds struct ipv6_pinfo *newnp, *np = inet6_sk(sk); 5921da177e4SLinus Torvalds struct sctp6_sock *newsctp6sk; 5931da177e4SLinus Torvalds 5941da177e4SLinus Torvalds newsk = sk_alloc(PF_INET6, GFP_KERNEL, sk->sk_prot, 1); 5951da177e4SLinus Torvalds if (!newsk) 5961da177e4SLinus Torvalds goto out; 5971da177e4SLinus Torvalds 5981da177e4SLinus Torvalds sock_init_data(NULL, newsk); 5991da177e4SLinus Torvalds 6001da177e4SLinus Torvalds newsk->sk_type = SOCK_STREAM; 6011da177e4SLinus Torvalds 6021da177e4SLinus Torvalds newsk->sk_prot = sk->sk_prot; 6031da177e4SLinus Torvalds newsk->sk_no_check = sk->sk_no_check; 6041da177e4SLinus Torvalds newsk->sk_reuse = sk->sk_reuse; 6051da177e4SLinus Torvalds 6061da177e4SLinus Torvalds newsk->sk_destruct = inet_sock_destruct; 6071da177e4SLinus Torvalds newsk->sk_family = PF_INET6; 6081da177e4SLinus Torvalds newsk->sk_protocol = IPPROTO_SCTP; 6091da177e4SLinus Torvalds newsk->sk_backlog_rcv = sk->sk_prot->backlog_rcv; 6101da177e4SLinus Torvalds newsk->sk_shutdown = sk->sk_shutdown; 6111da177e4SLinus Torvalds sock_reset_flag(sk, SOCK_ZAPPED); 6121da177e4SLinus Torvalds 6131da177e4SLinus Torvalds newsctp6sk = (struct sctp6_sock *)newsk; 6141da177e4SLinus Torvalds inet_sk(newsk)->pinet6 = &newsctp6sk->inet6; 6151da177e4SLinus Torvalds 6161da177e4SLinus Torvalds newinet = inet_sk(newsk); 6171da177e4SLinus Torvalds newnp = inet6_sk(newsk); 6181da177e4SLinus Torvalds 6191da177e4SLinus Torvalds memcpy(newnp, np, sizeof(struct ipv6_pinfo)); 6201da177e4SLinus Torvalds 6211da177e4SLinus Torvalds /* Initialize sk's sport, dport, rcv_saddr and daddr for getsockname() 6221da177e4SLinus Torvalds * and getpeername(). 6231da177e4SLinus Torvalds */ 6241da177e4SLinus Torvalds newinet->sport = inet->sport; 6251da177e4SLinus Torvalds newnp->saddr = np->saddr; 6261da177e4SLinus Torvalds newnp->rcv_saddr = np->rcv_saddr; 6271da177e4SLinus Torvalds newinet->dport = htons(asoc->peer.port); 6281da177e4SLinus Torvalds sctp_v6_to_sk_daddr(&asoc->peer.primary_addr, newsk); 6291da177e4SLinus Torvalds 6301da177e4SLinus Torvalds /* Init the ipv4 part of the socket since we can have sockets 6311da177e4SLinus Torvalds * using v6 API for ipv4. 6321da177e4SLinus Torvalds */ 6331da177e4SLinus Torvalds newinet->uc_ttl = -1; 6341da177e4SLinus Torvalds newinet->mc_loop = 1; 6351da177e4SLinus Torvalds newinet->mc_ttl = 1; 6361da177e4SLinus Torvalds newinet->mc_index = 0; 6371da177e4SLinus Torvalds newinet->mc_list = NULL; 6381da177e4SLinus Torvalds 6391da177e4SLinus Torvalds if (ipv4_config.no_pmtu_disc) 6401da177e4SLinus Torvalds newinet->pmtudisc = IP_PMTUDISC_DONT; 6411da177e4SLinus Torvalds else 6421da177e4SLinus Torvalds newinet->pmtudisc = IP_PMTUDISC_WANT; 6431da177e4SLinus Torvalds 644e6848976SArnaldo Carvalho de Melo sk_refcnt_debug_inc(newsk); 6451da177e4SLinus Torvalds 6461da177e4SLinus Torvalds if (newsk->sk_prot->init(newsk)) { 6471da177e4SLinus Torvalds sk_common_release(newsk); 6481da177e4SLinus Torvalds newsk = NULL; 6491da177e4SLinus Torvalds } 6501da177e4SLinus Torvalds 6511da177e4SLinus Torvalds out: 6521da177e4SLinus Torvalds return newsk; 6531da177e4SLinus Torvalds } 6541da177e4SLinus Torvalds 6551da177e4SLinus Torvalds /* Map v4 address to mapped v6 address */ 6561da177e4SLinus Torvalds static void sctp_v6_addr_v4map(struct sctp_sock *sp, union sctp_addr *addr) 6571da177e4SLinus Torvalds { 6581da177e4SLinus Torvalds if (sp->v4mapped && AF_INET == addr->sa.sa_family) 6591da177e4SLinus Torvalds sctp_v4_map_v6(addr); 6601da177e4SLinus Torvalds } 6611da177e4SLinus Torvalds 6621da177e4SLinus Torvalds /* Where did this skb come from? */ 6631da177e4SLinus Torvalds static int sctp_v6_skb_iif(const struct sk_buff *skb) 6641da177e4SLinus Torvalds { 6651da177e4SLinus Torvalds struct inet6_skb_parm *opt = (struct inet6_skb_parm *) skb->cb; 6661da177e4SLinus Torvalds return opt->iif; 6671da177e4SLinus Torvalds } 6681da177e4SLinus Torvalds 6691da177e4SLinus Torvalds /* Was this packet marked by Explicit Congestion Notification? */ 6701da177e4SLinus Torvalds static int sctp_v6_is_ce(const struct sk_buff *skb) 6711da177e4SLinus Torvalds { 6721da177e4SLinus Torvalds return *((__u32 *)(skb->nh.ipv6h)) & htonl(1<<20); 6731da177e4SLinus Torvalds } 6741da177e4SLinus Torvalds 6751da177e4SLinus Torvalds /* Dump the v6 addr to the seq file. */ 6761da177e4SLinus Torvalds static void sctp_v6_seq_dump_addr(struct seq_file *seq, union sctp_addr *addr) 6771da177e4SLinus Torvalds { 6781da177e4SLinus Torvalds seq_printf(seq, "%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x ", 6791da177e4SLinus Torvalds NIP6(addr->v6.sin6_addr)); 6801da177e4SLinus Torvalds } 6811da177e4SLinus Torvalds 6821da177e4SLinus Torvalds /* Initialize a PF_INET6 socket msg_name. */ 6831da177e4SLinus Torvalds static void sctp_inet6_msgname(char *msgname, int *addr_len) 6841da177e4SLinus Torvalds { 6851da177e4SLinus Torvalds struct sockaddr_in6 *sin6; 6861da177e4SLinus Torvalds 6871da177e4SLinus Torvalds sin6 = (struct sockaddr_in6 *)msgname; 6881da177e4SLinus Torvalds sin6->sin6_family = AF_INET6; 6891da177e4SLinus Torvalds sin6->sin6_flowinfo = 0; 6901da177e4SLinus Torvalds sin6->sin6_scope_id = 0; /*FIXME */ 6911da177e4SLinus Torvalds *addr_len = sizeof(struct sockaddr_in6); 6921da177e4SLinus Torvalds } 6931da177e4SLinus Torvalds 6941da177e4SLinus Torvalds /* Initialize a PF_INET msgname from a ulpevent. */ 6951da177e4SLinus Torvalds static void sctp_inet6_event_msgname(struct sctp_ulpevent *event, 6961da177e4SLinus Torvalds char *msgname, int *addrlen) 6971da177e4SLinus Torvalds { 6981da177e4SLinus Torvalds struct sockaddr_in6 *sin6, *sin6from; 6991da177e4SLinus Torvalds 7001da177e4SLinus Torvalds if (msgname) { 7011da177e4SLinus Torvalds union sctp_addr *addr; 7021da177e4SLinus Torvalds struct sctp_association *asoc; 7031da177e4SLinus Torvalds 7041da177e4SLinus Torvalds asoc = event->asoc; 7051da177e4SLinus Torvalds sctp_inet6_msgname(msgname, addrlen); 7061da177e4SLinus Torvalds sin6 = (struct sockaddr_in6 *)msgname; 7071da177e4SLinus Torvalds sin6->sin6_port = htons(asoc->peer.port); 7081da177e4SLinus Torvalds addr = &asoc->peer.primary_addr; 7091da177e4SLinus Torvalds 7101da177e4SLinus Torvalds /* Note: If we go to a common v6 format, this code 7111da177e4SLinus Torvalds * will change. 7121da177e4SLinus Torvalds */ 7131da177e4SLinus Torvalds 7141da177e4SLinus Torvalds /* Map ipv4 address into v4-mapped-on-v6 address. */ 7151da177e4SLinus Torvalds if (sctp_sk(asoc->base.sk)->v4mapped && 7161da177e4SLinus Torvalds AF_INET == addr->sa.sa_family) { 7171da177e4SLinus Torvalds sctp_v4_map_v6((union sctp_addr *)sin6); 7181da177e4SLinus Torvalds sin6->sin6_addr.s6_addr32[3] = 7191da177e4SLinus Torvalds addr->v4.sin_addr.s_addr; 7201da177e4SLinus Torvalds return; 7211da177e4SLinus Torvalds } 7221da177e4SLinus Torvalds 7231da177e4SLinus Torvalds sin6from = &asoc->peer.primary_addr.v6; 7241da177e4SLinus Torvalds ipv6_addr_copy(&sin6->sin6_addr, &sin6from->sin6_addr); 7251da177e4SLinus Torvalds if (ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL) 7261da177e4SLinus Torvalds sin6->sin6_scope_id = sin6from->sin6_scope_id; 7271da177e4SLinus Torvalds } 7281da177e4SLinus Torvalds } 7291da177e4SLinus Torvalds 7301da177e4SLinus Torvalds /* Initialize a msg_name from an inbound skb. */ 7311da177e4SLinus Torvalds static void sctp_inet6_skb_msgname(struct sk_buff *skb, char *msgname, 7321da177e4SLinus Torvalds int *addr_len) 7331da177e4SLinus Torvalds { 7341da177e4SLinus Torvalds struct sctphdr *sh; 7351da177e4SLinus Torvalds struct sockaddr_in6 *sin6; 7361da177e4SLinus Torvalds 7371da177e4SLinus Torvalds if (msgname) { 7381da177e4SLinus Torvalds sctp_inet6_msgname(msgname, addr_len); 7391da177e4SLinus Torvalds sin6 = (struct sockaddr_in6 *)msgname; 7401da177e4SLinus Torvalds sh = (struct sctphdr *)skb->h.raw; 7411da177e4SLinus Torvalds sin6->sin6_port = sh->source; 7421da177e4SLinus Torvalds 7431da177e4SLinus Torvalds /* Map ipv4 address into v4-mapped-on-v6 address. */ 7441da177e4SLinus Torvalds if (sctp_sk(skb->sk)->v4mapped && 7451da177e4SLinus Torvalds skb->nh.iph->version == 4) { 7461da177e4SLinus Torvalds sctp_v4_map_v6((union sctp_addr *)sin6); 7471da177e4SLinus Torvalds sin6->sin6_addr.s6_addr32[3] = skb->nh.iph->saddr; 7481da177e4SLinus Torvalds return; 7491da177e4SLinus Torvalds } 7501da177e4SLinus Torvalds 7511da177e4SLinus Torvalds /* Otherwise, just copy the v6 address. */ 7521da177e4SLinus Torvalds ipv6_addr_copy(&sin6->sin6_addr, &skb->nh.ipv6h->saddr); 7531da177e4SLinus Torvalds if (ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL) { 7541da177e4SLinus Torvalds struct sctp_ulpevent *ev = sctp_skb2event(skb); 7551da177e4SLinus Torvalds sin6->sin6_scope_id = ev->iif; 7561da177e4SLinus Torvalds } 7571da177e4SLinus Torvalds } 7581da177e4SLinus Torvalds } 7591da177e4SLinus Torvalds 7601da177e4SLinus Torvalds /* Do we support this AF? */ 7611da177e4SLinus Torvalds static int sctp_inet6_af_supported(sa_family_t family, struct sctp_sock *sp) 7621da177e4SLinus Torvalds { 7631da177e4SLinus Torvalds switch (family) { 7641da177e4SLinus Torvalds case AF_INET6: 7651da177e4SLinus Torvalds return 1; 7661da177e4SLinus Torvalds /* v4-mapped-v6 addresses */ 7671da177e4SLinus Torvalds case AF_INET: 7681da177e4SLinus Torvalds if (!__ipv6_only_sock(sctp_opt2sk(sp)) && sp->v4mapped) 7691da177e4SLinus Torvalds return 1; 7701da177e4SLinus Torvalds default: 7711da177e4SLinus Torvalds return 0; 7721da177e4SLinus Torvalds } 7731da177e4SLinus Torvalds } 7741da177e4SLinus Torvalds 7751da177e4SLinus Torvalds /* Address matching with wildcards allowed. This extra level 7761da177e4SLinus Torvalds * of indirection lets us choose whether a PF_INET6 should 7771da177e4SLinus Torvalds * disallow any v4 addresses if we so choose. 7781da177e4SLinus Torvalds */ 7791da177e4SLinus Torvalds static int sctp_inet6_cmp_addr(const union sctp_addr *addr1, 7801da177e4SLinus Torvalds const union sctp_addr *addr2, 7811da177e4SLinus Torvalds struct sctp_sock *opt) 7821da177e4SLinus Torvalds { 7831da177e4SLinus Torvalds struct sctp_af *af1, *af2; 7841da177e4SLinus Torvalds 7851da177e4SLinus Torvalds af1 = sctp_get_af_specific(addr1->sa.sa_family); 7861da177e4SLinus Torvalds af2 = sctp_get_af_specific(addr2->sa.sa_family); 7871da177e4SLinus Torvalds 7881da177e4SLinus Torvalds if (!af1 || !af2) 7891da177e4SLinus Torvalds return 0; 7901da177e4SLinus Torvalds /* Today, wildcard AF_INET/AF_INET6. */ 7911da177e4SLinus Torvalds if (sctp_is_any(addr1) || sctp_is_any(addr2)) 7921da177e4SLinus Torvalds return 1; 7931da177e4SLinus Torvalds 7941da177e4SLinus Torvalds if (addr1->sa.sa_family != addr2->sa.sa_family) 7951da177e4SLinus Torvalds return 0; 7961da177e4SLinus Torvalds 7971da177e4SLinus Torvalds return af1->cmp_addr(addr1, addr2); 7981da177e4SLinus Torvalds } 7991da177e4SLinus Torvalds 8001da177e4SLinus Torvalds /* Verify that the provided sockaddr looks bindable. Common verification, 8011da177e4SLinus Torvalds * has already been taken care of. 8021da177e4SLinus Torvalds */ 8031da177e4SLinus Torvalds static int sctp_inet6_bind_verify(struct sctp_sock *opt, union sctp_addr *addr) 8041da177e4SLinus Torvalds { 8051da177e4SLinus Torvalds struct sctp_af *af; 8061da177e4SLinus Torvalds 8071da177e4SLinus Torvalds /* ASSERT: address family has already been verified. */ 8081da177e4SLinus Torvalds if (addr->sa.sa_family != AF_INET6) 8091da177e4SLinus Torvalds af = sctp_get_af_specific(addr->sa.sa_family); 8101da177e4SLinus Torvalds else { 8111da177e4SLinus Torvalds int type = ipv6_addr_type(&addr->v6.sin6_addr); 8126a6ddb2aSSridhar Samudrala struct net_device *dev; 8131da177e4SLinus Torvalds 8146a6ddb2aSSridhar Samudrala if (type & IPV6_ADDR_LINKLOCAL) { 8156a6ddb2aSSridhar Samudrala if (!addr->v6.sin6_scope_id) 8161da177e4SLinus Torvalds return 0; 8176a6ddb2aSSridhar Samudrala dev = dev_get_by_index(addr->v6.sin6_scope_id); 8186a6ddb2aSSridhar Samudrala if (!dev) 8196a6ddb2aSSridhar Samudrala return 0; 8206a6ddb2aSSridhar Samudrala dev_put(dev); 8211da177e4SLinus Torvalds } 8221da177e4SLinus Torvalds af = opt->pf->af; 8231da177e4SLinus Torvalds } 8241da177e4SLinus Torvalds return af->available(addr, opt); 8251da177e4SLinus Torvalds } 8261da177e4SLinus Torvalds 8276a6ddb2aSSridhar Samudrala /* Verify that the provided sockaddr looks sendable. Common verification, 8281da177e4SLinus Torvalds * has already been taken care of. 8291da177e4SLinus Torvalds */ 8301da177e4SLinus Torvalds static int sctp_inet6_send_verify(struct sctp_sock *opt, union sctp_addr *addr) 8311da177e4SLinus Torvalds { 8321da177e4SLinus Torvalds struct sctp_af *af = NULL; 8331da177e4SLinus Torvalds 8341da177e4SLinus Torvalds /* ASSERT: address family has already been verified. */ 8351da177e4SLinus Torvalds if (addr->sa.sa_family != AF_INET6) 8361da177e4SLinus Torvalds af = sctp_get_af_specific(addr->sa.sa_family); 8371da177e4SLinus Torvalds else { 8381da177e4SLinus Torvalds int type = ipv6_addr_type(&addr->v6.sin6_addr); 8396a6ddb2aSSridhar Samudrala struct net_device *dev; 8401da177e4SLinus Torvalds 8416a6ddb2aSSridhar Samudrala if (type & IPV6_ADDR_LINKLOCAL) { 8426a6ddb2aSSridhar Samudrala if (!addr->v6.sin6_scope_id) 8431da177e4SLinus Torvalds return 0; 8446a6ddb2aSSridhar Samudrala dev = dev_get_by_index(addr->v6.sin6_scope_id); 8456a6ddb2aSSridhar Samudrala if (!dev) 8466a6ddb2aSSridhar Samudrala return 0; 8476a6ddb2aSSridhar Samudrala dev_put(dev); 8481da177e4SLinus Torvalds } 8491da177e4SLinus Torvalds af = opt->pf->af; 8501da177e4SLinus Torvalds } 8511da177e4SLinus Torvalds 8521da177e4SLinus Torvalds return af != NULL; 8531da177e4SLinus Torvalds } 8541da177e4SLinus Torvalds 8551da177e4SLinus Torvalds /* Fill in Supported Address Type information for INIT and INIT-ACK 8561da177e4SLinus Torvalds * chunks. Note: In the future, we may want to look at sock options 8571da177e4SLinus Torvalds * to determine whether a PF_INET6 socket really wants to have IPV4 8581da177e4SLinus Torvalds * addresses. 8591da177e4SLinus Torvalds * Returns number of addresses supported. 8601da177e4SLinus Torvalds */ 8611da177e4SLinus Torvalds static int sctp_inet6_supported_addrs(const struct sctp_sock *opt, 8621da177e4SLinus Torvalds __u16 *types) 8631da177e4SLinus Torvalds { 8641da177e4SLinus Torvalds types[0] = SCTP_PARAM_IPV4_ADDRESS; 8651da177e4SLinus Torvalds types[1] = SCTP_PARAM_IPV6_ADDRESS; 8661da177e4SLinus Torvalds return 2; 8671da177e4SLinus Torvalds } 8681da177e4SLinus Torvalds 8691da177e4SLinus Torvalds static struct proto_ops inet6_seqpacket_ops = { 8701da177e4SLinus Torvalds .family = PF_INET6, 8711da177e4SLinus Torvalds .owner = THIS_MODULE, 8721da177e4SLinus Torvalds .release = inet6_release, 8731da177e4SLinus Torvalds .bind = inet6_bind, 8741da177e4SLinus Torvalds .connect = inet_dgram_connect, 8751da177e4SLinus Torvalds .socketpair = sock_no_socketpair, 8761da177e4SLinus Torvalds .accept = inet_accept, 8771da177e4SLinus Torvalds .getname = inet6_getname, 8781da177e4SLinus Torvalds .poll = sctp_poll, 8791da177e4SLinus Torvalds .ioctl = inet6_ioctl, 8801da177e4SLinus Torvalds .listen = sctp_inet_listen, 8811da177e4SLinus Torvalds .shutdown = inet_shutdown, 8821da177e4SLinus Torvalds .setsockopt = sock_common_setsockopt, 8831da177e4SLinus Torvalds .getsockopt = sock_common_getsockopt, 8841da177e4SLinus Torvalds .sendmsg = inet_sendmsg, 8851da177e4SLinus Torvalds .recvmsg = sock_common_recvmsg, 8861da177e4SLinus Torvalds .mmap = sock_no_mmap, 8871da177e4SLinus Torvalds }; 8881da177e4SLinus Torvalds 8891da177e4SLinus Torvalds static struct inet_protosw sctpv6_seqpacket_protosw = { 8901da177e4SLinus Torvalds .type = SOCK_SEQPACKET, 8911da177e4SLinus Torvalds .protocol = IPPROTO_SCTP, 8921da177e4SLinus Torvalds .prot = &sctpv6_prot, 8931da177e4SLinus Torvalds .ops = &inet6_seqpacket_ops, 8941da177e4SLinus Torvalds .capability = -1, 8951da177e4SLinus Torvalds .no_check = 0, 8961da177e4SLinus Torvalds .flags = SCTP_PROTOSW_FLAG 8971da177e4SLinus Torvalds }; 8981da177e4SLinus Torvalds static struct inet_protosw sctpv6_stream_protosw = { 8991da177e4SLinus Torvalds .type = SOCK_STREAM, 9001da177e4SLinus Torvalds .protocol = IPPROTO_SCTP, 9011da177e4SLinus Torvalds .prot = &sctpv6_prot, 9021da177e4SLinus Torvalds .ops = &inet6_seqpacket_ops, 9031da177e4SLinus Torvalds .capability = -1, 9041da177e4SLinus Torvalds .no_check = 0, 9051da177e4SLinus Torvalds .flags = SCTP_PROTOSW_FLAG, 9061da177e4SLinus Torvalds }; 9071da177e4SLinus Torvalds 9081da177e4SLinus Torvalds static int sctp6_rcv(struct sk_buff **pskb, unsigned int *nhoffp) 9091da177e4SLinus Torvalds { 9101da177e4SLinus Torvalds return sctp_rcv(*pskb) ? -1 : 0; 9111da177e4SLinus Torvalds } 9121da177e4SLinus Torvalds 9131da177e4SLinus Torvalds static struct inet6_protocol sctpv6_protocol = { 9141da177e4SLinus Torvalds .handler = sctp6_rcv, 9151da177e4SLinus Torvalds .err_handler = sctp_v6_err, 9161da177e4SLinus Torvalds .flags = INET6_PROTO_NOPOLICY | INET6_PROTO_FINAL, 9171da177e4SLinus Torvalds }; 9181da177e4SLinus Torvalds 9191da177e4SLinus Torvalds static struct sctp_af sctp_ipv6_specific = { 9201da177e4SLinus Torvalds .sctp_xmit = sctp_v6_xmit, 9211da177e4SLinus Torvalds .setsockopt = ipv6_setsockopt, 9221da177e4SLinus Torvalds .getsockopt = ipv6_getsockopt, 9231da177e4SLinus Torvalds .get_dst = sctp_v6_get_dst, 9241da177e4SLinus Torvalds .get_saddr = sctp_v6_get_saddr, 9251da177e4SLinus Torvalds .copy_addrlist = sctp_v6_copy_addrlist, 9261da177e4SLinus Torvalds .from_skb = sctp_v6_from_skb, 9271da177e4SLinus Torvalds .from_sk = sctp_v6_from_sk, 9281da177e4SLinus Torvalds .to_sk_saddr = sctp_v6_to_sk_saddr, 9291da177e4SLinus Torvalds .to_sk_daddr = sctp_v6_to_sk_daddr, 9301da177e4SLinus Torvalds .from_addr_param = sctp_v6_from_addr_param, 9311da177e4SLinus Torvalds .to_addr_param = sctp_v6_to_addr_param, 9321da177e4SLinus Torvalds .dst_saddr = sctp_v6_dst_saddr, 9331da177e4SLinus Torvalds .cmp_addr = sctp_v6_cmp_addr, 9341da177e4SLinus Torvalds .scope = sctp_v6_scope, 9351da177e4SLinus Torvalds .addr_valid = sctp_v6_addr_valid, 9361da177e4SLinus Torvalds .inaddr_any = sctp_v6_inaddr_any, 9371da177e4SLinus Torvalds .is_any = sctp_v6_is_any, 9381da177e4SLinus Torvalds .available = sctp_v6_available, 9391da177e4SLinus Torvalds .skb_iif = sctp_v6_skb_iif, 9401da177e4SLinus Torvalds .is_ce = sctp_v6_is_ce, 9411da177e4SLinus Torvalds .seq_dump_addr = sctp_v6_seq_dump_addr, 9421da177e4SLinus Torvalds .net_header_len = sizeof(struct ipv6hdr), 9431da177e4SLinus Torvalds .sockaddr_len = sizeof(struct sockaddr_in6), 9441da177e4SLinus Torvalds .sa_family = AF_INET6, 9451da177e4SLinus Torvalds }; 9461da177e4SLinus Torvalds 9471da177e4SLinus Torvalds static struct sctp_pf sctp_pf_inet6_specific = { 9481da177e4SLinus Torvalds .event_msgname = sctp_inet6_event_msgname, 9491da177e4SLinus Torvalds .skb_msgname = sctp_inet6_skb_msgname, 9501da177e4SLinus Torvalds .af_supported = sctp_inet6_af_supported, 9511da177e4SLinus Torvalds .cmp_addr = sctp_inet6_cmp_addr, 9521da177e4SLinus Torvalds .bind_verify = sctp_inet6_bind_verify, 9531da177e4SLinus Torvalds .send_verify = sctp_inet6_send_verify, 9541da177e4SLinus Torvalds .supported_addrs = sctp_inet6_supported_addrs, 9551da177e4SLinus Torvalds .create_accept_sk = sctp_v6_create_accept_sk, 9561da177e4SLinus Torvalds .addr_v4map = sctp_v6_addr_v4map, 9571da177e4SLinus Torvalds .af = &sctp_ipv6_specific, 9581da177e4SLinus Torvalds }; 9591da177e4SLinus Torvalds 9601da177e4SLinus Torvalds /* Initialize IPv6 support and register with inet6 stack. */ 9611da177e4SLinus Torvalds int sctp_v6_init(void) 9621da177e4SLinus Torvalds { 9631da177e4SLinus Torvalds int rc = proto_register(&sctpv6_prot, 1); 9641da177e4SLinus Torvalds 9651da177e4SLinus Torvalds if (rc) 9661da177e4SLinus Torvalds goto out; 9671da177e4SLinus Torvalds /* Register inet6 protocol. */ 9681da177e4SLinus Torvalds rc = -EAGAIN; 9691da177e4SLinus Torvalds if (inet6_add_protocol(&sctpv6_protocol, IPPROTO_SCTP) < 0) 9701da177e4SLinus Torvalds goto out_unregister_sctp_proto; 9711da177e4SLinus Torvalds 9721da177e4SLinus Torvalds /* Add SCTPv6(UDP and TCP style) to inetsw6 linked list. */ 9731da177e4SLinus Torvalds inet6_register_protosw(&sctpv6_seqpacket_protosw); 9741da177e4SLinus Torvalds inet6_register_protosw(&sctpv6_stream_protosw); 9751da177e4SLinus Torvalds 9761da177e4SLinus Torvalds /* Register the SCTP specific PF_INET6 functions. */ 9771da177e4SLinus Torvalds sctp_register_pf(&sctp_pf_inet6_specific, PF_INET6); 9781da177e4SLinus Torvalds 9791da177e4SLinus Torvalds /* Register the SCTP specific AF_INET6 functions. */ 9801da177e4SLinus Torvalds sctp_register_af(&sctp_ipv6_specific); 9811da177e4SLinus Torvalds 9821da177e4SLinus Torvalds /* Register notifier for inet6 address additions/deletions. */ 9831da177e4SLinus Torvalds register_inet6addr_notifier(&sctp_inet6addr_notifier); 9841da177e4SLinus Torvalds rc = 0; 9851da177e4SLinus Torvalds out: 9861da177e4SLinus Torvalds return rc; 9871da177e4SLinus Torvalds out_unregister_sctp_proto: 9881da177e4SLinus Torvalds proto_unregister(&sctpv6_prot); 9891da177e4SLinus Torvalds goto out; 9901da177e4SLinus Torvalds } 9911da177e4SLinus Torvalds 9921da177e4SLinus Torvalds /* IPv6 specific exit support. */ 9931da177e4SLinus Torvalds void sctp_v6_exit(void) 9941da177e4SLinus Torvalds { 9951da177e4SLinus Torvalds list_del(&sctp_ipv6_specific.list); 9961da177e4SLinus Torvalds inet6_del_protocol(&sctpv6_protocol, IPPROTO_SCTP); 9971da177e4SLinus Torvalds inet6_unregister_protosw(&sctpv6_seqpacket_protosw); 9981da177e4SLinus Torvalds inet6_unregister_protosw(&sctpv6_stream_protosw); 9991da177e4SLinus Torvalds unregister_inet6addr_notifier(&sctp_inet6addr_notifier); 10001da177e4SLinus Torvalds proto_unregister(&sctpv6_prot); 10011da177e4SLinus Torvalds } 1002