160c778b2SVlad Yasevich /* SCTP kernel 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 * 760c778b2SVlad Yasevich * This file is part of the SCTP kernel implementation 81da177e4SLinus Torvalds * 91da177e4SLinus Torvalds * SCTP over IPv6. 101da177e4SLinus Torvalds * 1160c778b2SVlad Yasevich * This SCTP 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 * 1760c778b2SVlad Yasevich * This SCTP 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 50145ce502SJoe Perches #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 51145ce502SJoe Perches 521da177e4SLinus Torvalds #include <linux/module.h> 531da177e4SLinus Torvalds #include <linux/errno.h> 541da177e4SLinus Torvalds #include <linux/types.h> 551da177e4SLinus Torvalds #include <linux/socket.h> 561da177e4SLinus Torvalds #include <linux/sockios.h> 571da177e4SLinus Torvalds #include <linux/net.h> 581da177e4SLinus Torvalds #include <linux/in.h> 591da177e4SLinus Torvalds #include <linux/in6.h> 601da177e4SLinus Torvalds #include <linux/netdevice.h> 611da177e4SLinus Torvalds #include <linux/init.h> 621da177e4SLinus Torvalds #include <linux/ipsec.h> 635a0e3ad6STejun Heo #include <linux/slab.h> 641da177e4SLinus Torvalds 651da177e4SLinus Torvalds #include <linux/ipv6.h> 661da177e4SLinus Torvalds #include <linux/icmpv6.h> 671da177e4SLinus Torvalds #include <linux/random.h> 681da177e4SLinus Torvalds #include <linux/seq_file.h> 691da177e4SLinus Torvalds 701da177e4SLinus Torvalds #include <net/protocol.h> 711da177e4SLinus Torvalds #include <net/ndisc.h> 72c752f073SArnaldo Carvalho de Melo #include <net/ip.h> 731da177e4SLinus Torvalds #include <net/ipv6.h> 741da177e4SLinus Torvalds #include <net/transp_v6.h> 751da177e4SLinus Torvalds #include <net/addrconf.h> 761da177e4SLinus Torvalds #include <net/ip6_route.h> 771da177e4SLinus Torvalds #include <net/inet_common.h> 781da177e4SLinus Torvalds #include <net/inet_ecn.h> 791da177e4SLinus Torvalds #include <net/sctp/sctp.h> 801da177e4SLinus Torvalds 811da177e4SLinus Torvalds #include <asm/uaccess.h> 821da177e4SLinus Torvalds 8329303547SVlad Yasevich /* Event handler for inet6 address addition/deletion events. 8429303547SVlad Yasevich * The sctp_local_addr_list needs to be protocted by a spin lock since 8529303547SVlad Yasevich * multiple notifiers (say IPv4 and IPv6) may be running at the same 8629303547SVlad Yasevich * time and thus corrupt the list. 8729303547SVlad Yasevich * The reader side is protected with RCU. 8829303547SVlad Yasevich */ 8924123186SAdrian Bunk static int sctp_inet6addr_event(struct notifier_block *this, unsigned long ev, 9029c7cf96SSridhar Samudrala void *ptr) 9129c7cf96SSridhar Samudrala { 9229c7cf96SSridhar Samudrala struct inet6_ifaddr *ifa = (struct inet6_ifaddr *)ptr; 9329303547SVlad Yasevich struct sctp_sockaddr_entry *addr = NULL; 9429303547SVlad Yasevich struct sctp_sockaddr_entry *temp; 9522626216SChidambar 'ilLogict' Zinnoury int found = 0; 9629c7cf96SSridhar Samudrala 9729c7cf96SSridhar Samudrala switch (ev) { 9829c7cf96SSridhar Samudrala case NETDEV_UP: 9929c7cf96SSridhar Samudrala addr = kmalloc(sizeof(struct sctp_sockaddr_entry), GFP_ATOMIC); 10029c7cf96SSridhar Samudrala if (addr) { 10129c7cf96SSridhar Samudrala addr->a.v6.sin6_family = AF_INET6; 10229c7cf96SSridhar Samudrala addr->a.v6.sin6_port = 0; 1034fe1d58bSJoe Perches ipv6_addr_copy(&addr->a.v6.sin6_addr, &ifa->addr); 10429c7cf96SSridhar Samudrala addr->a.v6.sin6_scope_id = ifa->idev->dev->ifindex; 10529303547SVlad Yasevich addr->valid = 1; 10629303547SVlad Yasevich spin_lock_bh(&sctp_local_addr_lock); 10729303547SVlad Yasevich list_add_tail_rcu(&addr->list, &sctp_local_addr_list); 10829303547SVlad Yasevich spin_unlock_bh(&sctp_local_addr_lock); 10929c7cf96SSridhar Samudrala } 11029c7cf96SSridhar Samudrala break; 11129c7cf96SSridhar Samudrala case NETDEV_DOWN: 11229303547SVlad Yasevich spin_lock_bh(&sctp_local_addr_lock); 11329303547SVlad Yasevich list_for_each_entry_safe(addr, temp, 11429303547SVlad Yasevich &sctp_local_addr_list, list) { 115a40a7d15SPavel Emelyanov if (addr->a.sa.sa_family == AF_INET6 && 116a40a7d15SPavel Emelyanov ipv6_addr_equal(&addr->a.v6.sin6_addr, 11729303547SVlad Yasevich &ifa->addr)) { 11822626216SChidambar 'ilLogict' Zinnoury found = 1; 11929303547SVlad Yasevich addr->valid = 0; 12029303547SVlad Yasevich list_del_rcu(&addr->list); 12129c7cf96SSridhar Samudrala break; 12229c7cf96SSridhar Samudrala } 12329c7cf96SSridhar Samudrala } 12429303547SVlad Yasevich spin_unlock_bh(&sctp_local_addr_lock); 12522626216SChidambar 'ilLogict' Zinnoury if (found) 12629303547SVlad Yasevich call_rcu(&addr->rcu, sctp_local_addr_free); 12729c7cf96SSridhar Samudrala break; 12829c7cf96SSridhar Samudrala } 12929c7cf96SSridhar Samudrala 13029c7cf96SSridhar Samudrala return NOTIFY_DONE; 13129c7cf96SSridhar Samudrala } 13229c7cf96SSridhar Samudrala 1331da177e4SLinus Torvalds static struct notifier_block sctp_inet6addr_notifier = { 13429c7cf96SSridhar Samudrala .notifier_call = sctp_inet6addr_event, 1351da177e4SLinus Torvalds }; 1361da177e4SLinus Torvalds 1371da177e4SLinus Torvalds /* ICMP error handler. */ 1381da177e4SLinus Torvalds SCTP_STATIC void sctp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, 139d5fdd6baSBrian Haley u8 type, u8 code, int offset, __be32 info) 1401da177e4SLinus Torvalds { 1411da177e4SLinus Torvalds struct inet6_dev *idev; 1421da177e4SLinus Torvalds struct sock *sk; 1431da177e4SLinus Torvalds struct sctp_association *asoc; 1441da177e4SLinus Torvalds struct sctp_transport *transport; 1451da177e4SLinus Torvalds struct ipv6_pinfo *np; 1462e07fa9cSArnaldo Carvalho de Melo sk_buff_data_t saveip, savesctp; 1471da177e4SLinus Torvalds int err; 1481da177e4SLinus Torvalds 1491da177e4SLinus Torvalds idev = in6_dev_get(skb->dev); 1501da177e4SLinus Torvalds 1511da177e4SLinus Torvalds /* Fix up skb to look at the embedded net header. */ 152b0e380b1SArnaldo Carvalho de Melo saveip = skb->network_header; 153b0e380b1SArnaldo Carvalho de Melo savesctp = skb->transport_header; 1541ced98e8SArnaldo Carvalho de Melo skb_reset_network_header(skb); 155a27ef749SArnaldo Carvalho de Melo skb_set_transport_header(skb, offset); 156a27ef749SArnaldo Carvalho de Melo sk = sctp_err_lookup(AF_INET6, skb, sctp_hdr(skb), &asoc, &transport); 1571da177e4SLinus Torvalds /* Put back, the original pointers. */ 158b0e380b1SArnaldo Carvalho de Melo skb->network_header = saveip; 159b0e380b1SArnaldo Carvalho de Melo skb->transport_header = savesctp; 1601da177e4SLinus Torvalds if (!sk) { 161e41b5368SDenis V. Lunev ICMP6_INC_STATS_BH(dev_net(skb->dev), idev, ICMP6_MIB_INERRORS); 1621da177e4SLinus Torvalds goto out; 1631da177e4SLinus Torvalds } 1641da177e4SLinus Torvalds 1651da177e4SLinus Torvalds /* Warning: The sock lock is held. Remember to call 1661da177e4SLinus Torvalds * sctp_err_finish! 1671da177e4SLinus Torvalds */ 1681da177e4SLinus Torvalds 1691da177e4SLinus Torvalds switch (type) { 1701da177e4SLinus Torvalds case ICMPV6_PKT_TOOBIG: 1711da177e4SLinus Torvalds sctp_icmp_frag_needed(sk, asoc, transport, ntohl(info)); 1721da177e4SLinus Torvalds goto out_unlock; 1731da177e4SLinus Torvalds case ICMPV6_PARAMPROB: 1741da177e4SLinus Torvalds if (ICMPV6_UNK_NEXTHDR == code) { 175d1ad1ff2SSridhar Samudrala sctp_icmp_proto_unreachable(sk, asoc, transport); 1761da177e4SLinus Torvalds goto out_unlock; 1771da177e4SLinus Torvalds } 1781da177e4SLinus Torvalds break; 1791da177e4SLinus Torvalds default: 1801da177e4SLinus Torvalds break; 1811da177e4SLinus Torvalds } 1821da177e4SLinus Torvalds 1831da177e4SLinus Torvalds np = inet6_sk(sk); 1841da177e4SLinus Torvalds icmpv6_err_convert(type, code, &err); 1851da177e4SLinus Torvalds if (!sock_owned_by_user(sk) && np->recverr) { 1861da177e4SLinus Torvalds sk->sk_err = err; 1871da177e4SLinus Torvalds sk->sk_error_report(sk); 1881da177e4SLinus Torvalds } else { /* Only an error on timeout */ 1891da177e4SLinus Torvalds sk->sk_err_soft = err; 1901da177e4SLinus Torvalds } 1911da177e4SLinus Torvalds 1921da177e4SLinus Torvalds out_unlock: 193d1ad1ff2SSridhar Samudrala sctp_err_finish(sk, asoc); 1941da177e4SLinus Torvalds out: 1951da177e4SLinus Torvalds if (likely(idev != NULL)) 1961da177e4SLinus Torvalds in6_dev_put(idev); 1971da177e4SLinus Torvalds } 1981da177e4SLinus Torvalds 1991da177e4SLinus Torvalds /* Based on tcp_v6_xmit() in tcp_ipv6.c. */ 200f880374cSHerbert Xu static int sctp_v6_xmit(struct sk_buff *skb, struct sctp_transport *transport) 2011da177e4SLinus Torvalds { 2021da177e4SLinus Torvalds struct sock *sk = skb->sk; 2031da177e4SLinus Torvalds struct ipv6_pinfo *np = inet6_sk(sk); 2044c9483b2SDavid S. Miller struct flowi6 fl6; 2051da177e4SLinus Torvalds 2064c9483b2SDavid S. Miller memset(&fl6, 0, sizeof(fl6)); 2071da177e4SLinus Torvalds 2084c9483b2SDavid S. Miller fl6.flowi6_proto = sk->sk_protocol; 2091da177e4SLinus Torvalds 2101da177e4SLinus Torvalds /* Fill in the dest address from the route entry passed with the skb 2111da177e4SLinus Torvalds * and the source address from the transport. 2121da177e4SLinus Torvalds */ 2134c9483b2SDavid S. Miller ipv6_addr_copy(&fl6.daddr, &transport->ipaddr.v6.sin6_addr); 2144c9483b2SDavid S. Miller ipv6_addr_copy(&fl6.saddr, &transport->saddr.v6.sin6_addr); 2151da177e4SLinus Torvalds 2164c9483b2SDavid S. Miller fl6.flowlabel = np->flow_label; 2174c9483b2SDavid S. Miller IP6_ECN_flow_xmit(sk, fl6.flowlabel); 2184c9483b2SDavid S. Miller if (ipv6_addr_type(&fl6.saddr) & IPV6_ADDR_LINKLOCAL) 2194c9483b2SDavid S. Miller fl6.flowi6_oif = transport->saddr.v6.sin6_scope_id; 2201da177e4SLinus Torvalds else 2214c9483b2SDavid S. Miller fl6.flowi6_oif = sk->sk_bound_dev_if; 2221da177e4SLinus Torvalds 2231da177e4SLinus Torvalds if (np->opt && np->opt->srcrt) { 2241da177e4SLinus Torvalds struct rt0_hdr *rt0 = (struct rt0_hdr *) np->opt->srcrt; 2254c9483b2SDavid S. Miller ipv6_addr_copy(&fl6.daddr, rt0->addr); 2261da177e4SLinus Torvalds } 2271da177e4SLinus Torvalds 2285b095d98SHarvey Harrison SCTP_DEBUG_PRINTK("%s: skb:%p, len:%d, src:%pI6 dst:%pI6\n", 2290dc47877SHarvey Harrison __func__, skb, skb->len, 2304c9483b2SDavid S. Miller &fl6.saddr, &fl6.daddr); 2311da177e4SLinus Torvalds 2321da177e4SLinus Torvalds SCTP_INC_STATS(SCTP_MIB_OUTSCTPPACKS); 2331da177e4SLinus Torvalds 234f880374cSHerbert Xu if (!(transport->param_flags & SPP_PMTUD_ENABLE)) 235f880374cSHerbert Xu skb->local_df = 1; 236f880374cSHerbert Xu 2374c9483b2SDavid S. Miller return ip6_xmit(sk, skb, &fl6, np->opt); 2381da177e4SLinus Torvalds } 2391da177e4SLinus Torvalds 2401da177e4SLinus Torvalds /* Returns the dst cache entry for the given source and destination ip 2411da177e4SLinus Torvalds * addresses. 2421da177e4SLinus Torvalds */ 2431da177e4SLinus Torvalds static struct dst_entry *sctp_v6_get_dst(struct sctp_association *asoc, 2441da177e4SLinus Torvalds union sctp_addr *daddr, 2451da177e4SLinus Torvalds union sctp_addr *saddr) 2461da177e4SLinus Torvalds { 2471da177e4SLinus Torvalds struct dst_entry *dst; 2484c9483b2SDavid S. Miller struct flowi6 fl6; 2491da177e4SLinus Torvalds 2504c9483b2SDavid S. Miller memset(&fl6, 0, sizeof(fl6)); 2514c9483b2SDavid S. Miller ipv6_addr_copy(&fl6.daddr, &daddr->v6.sin6_addr); 2521da177e4SLinus Torvalds if (ipv6_addr_type(&daddr->v6.sin6_addr) & IPV6_ADDR_LINKLOCAL) 2534c9483b2SDavid S. Miller fl6.flowi6_oif = daddr->v6.sin6_scope_id; 2541da177e4SLinus Torvalds 2551da177e4SLinus Torvalds 2564c9483b2SDavid S. Miller SCTP_DEBUG_PRINTK("%s: DST=%pI6 ", __func__, &fl6.daddr); 2571da177e4SLinus Torvalds 2581da177e4SLinus Torvalds if (saddr) { 2594c9483b2SDavid S. Miller ipv6_addr_copy(&fl6.saddr, &saddr->v6.sin6_addr); 2604c9483b2SDavid S. Miller SCTP_DEBUG_PRINTK("SRC=%pI6 - ", &fl6.saddr); 2611da177e4SLinus Torvalds } 2621da177e4SLinus Torvalds 2634c9483b2SDavid S. Miller dst = ip6_route_output(&init_net, NULL, &fl6); 2644251320fSVille Nuorvala if (!dst->error) { 2651da177e4SLinus Torvalds struct rt6_info *rt; 2661da177e4SLinus Torvalds rt = (struct rt6_info *)dst; 2675b095d98SHarvey Harrison SCTP_DEBUG_PRINTK("rt6_dst:%pI6 rt6_src:%pI6\n", 268fdb46ee7SHarvey Harrison &rt->rt6i_dst.addr, &rt->rt6i_src.addr); 2691da177e4SLinus Torvalds return dst; 2701da177e4SLinus Torvalds } 2714251320fSVille Nuorvala SCTP_DEBUG_PRINTK("NO ROUTE\n"); 2724251320fSVille Nuorvala dst_release(dst); 2734251320fSVille Nuorvala return NULL; 2744251320fSVille Nuorvala } 2751da177e4SLinus Torvalds 2761da177e4SLinus Torvalds /* Returns the number of consecutive initial bits that match in the 2 ipv6 2771da177e4SLinus Torvalds * addresses. 2781da177e4SLinus Torvalds */ 2791da177e4SLinus Torvalds static inline int sctp_v6_addr_match_len(union sctp_addr *s1, 2801da177e4SLinus Torvalds union sctp_addr *s2) 2811da177e4SLinus Torvalds { 282de7737e0SYOSHIFUJI Hideaki / 吉藤英明 return ipv6_addr_diff(&s1->v6.sin6_addr, &s2->v6.sin6_addr); 2831da177e4SLinus Torvalds } 2841da177e4SLinus Torvalds 2851da177e4SLinus Torvalds /* Fills in the source address(saddr) based on the destination address(daddr) 2861da177e4SLinus Torvalds * and asoc's bind address list. 2871da177e4SLinus Torvalds */ 288e5117101SYOSHIFUJI Hideaki static void sctp_v6_get_saddr(struct sctp_sock *sk, 289e5117101SYOSHIFUJI Hideaki struct sctp_association *asoc, 2901da177e4SLinus Torvalds struct dst_entry *dst, 2911da177e4SLinus Torvalds union sctp_addr *daddr, 2921da177e4SLinus Torvalds union sctp_addr *saddr) 2931da177e4SLinus Torvalds { 2941da177e4SLinus Torvalds struct sctp_bind_addr *bp; 2951da177e4SLinus Torvalds struct sctp_sockaddr_entry *laddr; 2961da177e4SLinus Torvalds sctp_scope_t scope; 2971da177e4SLinus Torvalds union sctp_addr *baddr = NULL; 2981da177e4SLinus Torvalds __u8 matchlen = 0; 2991da177e4SLinus Torvalds __u8 bmatchlen; 3001da177e4SLinus Torvalds 3015b095d98SHarvey Harrison SCTP_DEBUG_PRINTK("%s: asoc:%p dst:%p daddr:%pI6 ", 302fdb46ee7SHarvey Harrison __func__, asoc, dst, &daddr->v6.sin6_addr); 3031da177e4SLinus Torvalds 3041da177e4SLinus Torvalds if (!asoc) { 305191cd582SBrian Haley ipv6_dev_get_saddr(sock_net(sctp_opt2sk(sk)), 306191cd582SBrian Haley dst ? ip6_dst_idev(dst)->dev : NULL, 3077cbca67cSYOSHIFUJI Hideaki &daddr->v6.sin6_addr, 308e5117101SYOSHIFUJI Hideaki inet6_sk(&sk->inet.sk)->srcprefs, 3097cbca67cSYOSHIFUJI Hideaki &saddr->v6.sin6_addr); 3105b095d98SHarvey Harrison SCTP_DEBUG_PRINTK("saddr from ipv6_get_saddr: %pI6\n", 311fdb46ee7SHarvey Harrison &saddr->v6.sin6_addr); 3121da177e4SLinus Torvalds return; 3131da177e4SLinus Torvalds } 3141da177e4SLinus Torvalds 3151da177e4SLinus Torvalds scope = sctp_scope(daddr); 3161da177e4SLinus Torvalds 3171da177e4SLinus Torvalds bp = &asoc->base.bind_addr; 3181da177e4SLinus Torvalds 3191da177e4SLinus Torvalds /* Go through the bind address list and find the best source address 3201da177e4SLinus Torvalds * that matches the scope of the destination address. 3211da177e4SLinus Torvalds */ 322559cf710SVlad Yasevich rcu_read_lock(); 323559cf710SVlad Yasevich list_for_each_entry_rcu(laddr, &bp->address_list, list) { 324559cf710SVlad Yasevich if (!laddr->valid) 325559cf710SVlad Yasevich continue; 326f57d96b2SVlad Yasevich if ((laddr->state == SCTP_ADDR_SRC) && 3276244be4eSAl Viro (laddr->a.sa.sa_family == AF_INET6) && 3286244be4eSAl Viro (scope <= sctp_scope(&laddr->a))) { 329d3f7a54aSAl Viro bmatchlen = sctp_v6_addr_match_len(daddr, &laddr->a); 3301da177e4SLinus Torvalds if (!baddr || (matchlen < bmatchlen)) { 331d3f7a54aSAl Viro baddr = &laddr->a; 3321da177e4SLinus Torvalds matchlen = bmatchlen; 3331da177e4SLinus Torvalds } 3341da177e4SLinus Torvalds } 3351da177e4SLinus Torvalds } 3361da177e4SLinus Torvalds 3371da177e4SLinus Torvalds if (baddr) { 3381da177e4SLinus Torvalds memcpy(saddr, baddr, sizeof(union sctp_addr)); 3395b095d98SHarvey Harrison SCTP_DEBUG_PRINTK("saddr: %pI6\n", &saddr->v6.sin6_addr); 3401da177e4SLinus Torvalds } else { 341145ce502SJoe Perches pr_err("%s: asoc:%p Could not find a valid source " 3425b095d98SHarvey Harrison "address for the dest:%pI6\n", 343fdb46ee7SHarvey Harrison __func__, asoc, &daddr->v6.sin6_addr); 3441da177e4SLinus Torvalds } 3451da177e4SLinus Torvalds 346559cf710SVlad Yasevich rcu_read_unlock(); 3471da177e4SLinus Torvalds } 3481da177e4SLinus Torvalds 3491da177e4SLinus Torvalds /* Make a copy of all potential local addresses. */ 3501da177e4SLinus Torvalds static void sctp_v6_copy_addrlist(struct list_head *addrlist, 3511da177e4SLinus Torvalds struct net_device *dev) 3521da177e4SLinus Torvalds { 3531da177e4SLinus Torvalds struct inet6_dev *in6_dev; 3541da177e4SLinus Torvalds struct inet6_ifaddr *ifp; 3551da177e4SLinus Torvalds struct sctp_sockaddr_entry *addr; 3561da177e4SLinus Torvalds 3578814c4b5SYOSHIFUJI Hideaki rcu_read_lock(); 3581da177e4SLinus Torvalds if ((in6_dev = __in6_dev_get(dev)) == NULL) { 3598814c4b5SYOSHIFUJI Hideaki rcu_read_unlock(); 3601da177e4SLinus Torvalds return; 3611da177e4SLinus Torvalds } 3621da177e4SLinus Torvalds 363e2eb8d45SJarek Poplawski read_lock_bh(&in6_dev->lock); 364502a2ffdSstephen hemminger list_for_each_entry(ifp, &in6_dev->addr_list, if_list) { 3651da177e4SLinus Torvalds /* Add the address to the local list. */ 3661da177e4SLinus Torvalds addr = t_new(struct sctp_sockaddr_entry, GFP_ATOMIC); 3671da177e4SLinus Torvalds if (addr) { 3682a6fd78aSAl Viro addr->a.v6.sin6_family = AF_INET6; 3692a6fd78aSAl Viro addr->a.v6.sin6_port = 0; 370486f50caSBrian Haley ipv6_addr_copy(&addr->a.v6.sin6_addr, &ifp->addr); 3712a6fd78aSAl Viro addr->a.v6.sin6_scope_id = dev->ifindex; 37229303547SVlad Yasevich addr->valid = 1; 3731da177e4SLinus Torvalds INIT_LIST_HEAD(&addr->list); 3741da177e4SLinus Torvalds list_add_tail(&addr->list, addrlist); 3751da177e4SLinus Torvalds } 3761da177e4SLinus Torvalds } 3771da177e4SLinus Torvalds 378e2eb8d45SJarek Poplawski read_unlock_bh(&in6_dev->lock); 3798814c4b5SYOSHIFUJI Hideaki rcu_read_unlock(); 3801da177e4SLinus Torvalds } 3811da177e4SLinus Torvalds 3821da177e4SLinus Torvalds /* Initialize a sockaddr_storage from in incoming skb. */ 3831da177e4SLinus Torvalds static void sctp_v6_from_skb(union sctp_addr *addr,struct sk_buff *skb, 3841da177e4SLinus Torvalds int is_saddr) 3851da177e4SLinus Torvalds { 3861da177e4SLinus Torvalds void *from; 387d55c41b1SAl Viro __be16 *port; 3881da177e4SLinus Torvalds struct sctphdr *sh; 3891da177e4SLinus Torvalds 3901da177e4SLinus Torvalds port = &addr->v6.sin6_port; 3911da177e4SLinus Torvalds addr->v6.sin6_family = AF_INET6; 3921da177e4SLinus Torvalds addr->v6.sin6_flowinfo = 0; /* FIXME */ 3931da177e4SLinus Torvalds addr->v6.sin6_scope_id = ((struct inet6_skb_parm *)skb->cb)->iif; 3941da177e4SLinus Torvalds 3952c0fd387SArnaldo Carvalho de Melo sh = sctp_hdr(skb); 3961da177e4SLinus Torvalds if (is_saddr) { 397d55c41b1SAl Viro *port = sh->source; 3980660e03fSArnaldo Carvalho de Melo from = &ipv6_hdr(skb)->saddr; 3991da177e4SLinus Torvalds } else { 400d55c41b1SAl Viro *port = sh->dest; 4010660e03fSArnaldo Carvalho de Melo from = &ipv6_hdr(skb)->daddr; 4021da177e4SLinus Torvalds } 4031da177e4SLinus Torvalds ipv6_addr_copy(&addr->v6.sin6_addr, from); 4041da177e4SLinus Torvalds } 4051da177e4SLinus Torvalds 4061da177e4SLinus Torvalds /* Initialize an sctp_addr from a socket. */ 4071da177e4SLinus Torvalds static void sctp_v6_from_sk(union sctp_addr *addr, struct sock *sk) 4081da177e4SLinus Torvalds { 4091da177e4SLinus Torvalds addr->v6.sin6_family = AF_INET6; 4107dcdbd95SAl Viro addr->v6.sin6_port = 0; 411486f50caSBrian Haley ipv6_addr_copy(&addr->v6.sin6_addr, &inet6_sk(sk)->rcv_saddr); 4121da177e4SLinus Torvalds } 4131da177e4SLinus Torvalds 4141da177e4SLinus Torvalds /* Initialize sk->sk_rcv_saddr from sctp_addr. */ 4151da177e4SLinus Torvalds static void sctp_v6_to_sk_saddr(union sctp_addr *addr, struct sock *sk) 4161da177e4SLinus Torvalds { 4171da177e4SLinus Torvalds if (addr->sa.sa_family == AF_INET && sctp_sk(sk)->v4mapped) { 4181da177e4SLinus Torvalds inet6_sk(sk)->rcv_saddr.s6_addr32[0] = 0; 4191da177e4SLinus Torvalds inet6_sk(sk)->rcv_saddr.s6_addr32[1] = 0; 4201da177e4SLinus Torvalds inet6_sk(sk)->rcv_saddr.s6_addr32[2] = htonl(0x0000ffff); 4211da177e4SLinus Torvalds inet6_sk(sk)->rcv_saddr.s6_addr32[3] = 4221da177e4SLinus Torvalds addr->v4.sin_addr.s_addr; 4231da177e4SLinus Torvalds } else { 424486f50caSBrian Haley ipv6_addr_copy(&inet6_sk(sk)->rcv_saddr, &addr->v6.sin6_addr); 4251da177e4SLinus Torvalds } 4261da177e4SLinus Torvalds } 4271da177e4SLinus Torvalds 4281da177e4SLinus Torvalds /* Initialize sk->sk_daddr from sctp_addr. */ 4291da177e4SLinus Torvalds static void sctp_v6_to_sk_daddr(union sctp_addr *addr, struct sock *sk) 4301da177e4SLinus Torvalds { 4311da177e4SLinus Torvalds if (addr->sa.sa_family == AF_INET && sctp_sk(sk)->v4mapped) { 4321da177e4SLinus Torvalds inet6_sk(sk)->daddr.s6_addr32[0] = 0; 4331da177e4SLinus Torvalds inet6_sk(sk)->daddr.s6_addr32[1] = 0; 4341da177e4SLinus Torvalds inet6_sk(sk)->daddr.s6_addr32[2] = htonl(0x0000ffff); 4351da177e4SLinus Torvalds inet6_sk(sk)->daddr.s6_addr32[3] = addr->v4.sin_addr.s_addr; 4361da177e4SLinus Torvalds } else { 437486f50caSBrian Haley ipv6_addr_copy(&inet6_sk(sk)->daddr, &addr->v6.sin6_addr); 4381da177e4SLinus Torvalds } 4391da177e4SLinus Torvalds } 4401da177e4SLinus Torvalds 4411da177e4SLinus Torvalds /* Initialize a sctp_addr from an address parameter. */ 4421da177e4SLinus Torvalds static void sctp_v6_from_addr_param(union sctp_addr *addr, 4431da177e4SLinus Torvalds union sctp_addr_param *param, 444dd86d136SAl Viro __be16 port, int iif) 4451da177e4SLinus Torvalds { 4461da177e4SLinus Torvalds addr->v6.sin6_family = AF_INET6; 4471da177e4SLinus Torvalds addr->v6.sin6_port = port; 4481da177e4SLinus Torvalds addr->v6.sin6_flowinfo = 0; /* BUG */ 4491da177e4SLinus Torvalds ipv6_addr_copy(&addr->v6.sin6_addr, ¶m->v6.addr); 4501da177e4SLinus Torvalds addr->v6.sin6_scope_id = iif; 4511da177e4SLinus Torvalds } 4521da177e4SLinus Torvalds 4531da177e4SLinus Torvalds /* Initialize an address parameter from a sctp_addr and return the length 4541da177e4SLinus Torvalds * of the address parameter. 4551da177e4SLinus Torvalds */ 4561da177e4SLinus Torvalds static int sctp_v6_to_addr_param(const union sctp_addr *addr, 4571da177e4SLinus Torvalds union sctp_addr_param *param) 4581da177e4SLinus Torvalds { 4591da177e4SLinus Torvalds int length = sizeof(sctp_ipv6addr_param_t); 4601da177e4SLinus Torvalds 4611da177e4SLinus Torvalds param->v6.param_hdr.type = SCTP_PARAM_IPV6_ADDRESS; 462dbc16db1SAl Viro param->v6.param_hdr.length = htons(length); 4631da177e4SLinus Torvalds ipv6_addr_copy(¶m->v6.addr, &addr->v6.sin6_addr); 4641da177e4SLinus Torvalds 4651da177e4SLinus Torvalds return length; 4661da177e4SLinus Torvalds } 4671da177e4SLinus Torvalds 4681da177e4SLinus Torvalds /* Initialize a sctp_addr from a dst_entry. */ 4691da177e4SLinus Torvalds static void sctp_v6_dst_saddr(union sctp_addr *addr, struct dst_entry *dst, 470854d43a4SAl Viro __be16 port) 4711da177e4SLinus Torvalds { 4721da177e4SLinus Torvalds struct rt6_info *rt = (struct rt6_info *)dst; 4731da177e4SLinus Torvalds addr->sa.sa_family = AF_INET6; 4741da177e4SLinus Torvalds addr->v6.sin6_port = port; 4751da177e4SLinus Torvalds ipv6_addr_copy(&addr->v6.sin6_addr, &rt->rt6i_src.addr); 4761da177e4SLinus Torvalds } 4771da177e4SLinus Torvalds 4781da177e4SLinus Torvalds /* Compare addresses exactly. 4791da177e4SLinus Torvalds * v4-mapped-v6 is also in consideration. 4801da177e4SLinus Torvalds */ 4811da177e4SLinus Torvalds static int sctp_v6_cmp_addr(const union sctp_addr *addr1, 4821da177e4SLinus Torvalds const union sctp_addr *addr2) 4831da177e4SLinus Torvalds { 4841da177e4SLinus Torvalds if (addr1->sa.sa_family != addr2->sa.sa_family) { 4851da177e4SLinus Torvalds if (addr1->sa.sa_family == AF_INET && 4861da177e4SLinus Torvalds addr2->sa.sa_family == AF_INET6 && 487e773e4faSBrian Haley ipv6_addr_v4mapped(&addr2->v6.sin6_addr)) { 4881da177e4SLinus Torvalds if (addr2->v6.sin6_port == addr1->v4.sin_port && 4891da177e4SLinus Torvalds addr2->v6.sin6_addr.s6_addr32[3] == 4901da177e4SLinus Torvalds addr1->v4.sin_addr.s_addr) 4911da177e4SLinus Torvalds return 1; 4921da177e4SLinus Torvalds } 4931da177e4SLinus Torvalds if (addr2->sa.sa_family == AF_INET && 4941da177e4SLinus Torvalds addr1->sa.sa_family == AF_INET6 && 495e773e4faSBrian Haley ipv6_addr_v4mapped(&addr1->v6.sin6_addr)) { 4961da177e4SLinus Torvalds if (addr1->v6.sin6_port == addr2->v4.sin_port && 4971da177e4SLinus Torvalds addr1->v6.sin6_addr.s6_addr32[3] == 4981da177e4SLinus Torvalds addr2->v4.sin_addr.s_addr) 4991da177e4SLinus Torvalds return 1; 5001da177e4SLinus Torvalds } 5011da177e4SLinus Torvalds return 0; 5021da177e4SLinus Torvalds } 5031da177e4SLinus Torvalds if (!ipv6_addr_equal(&addr1->v6.sin6_addr, &addr2->v6.sin6_addr)) 5041da177e4SLinus Torvalds return 0; 5051da177e4SLinus Torvalds /* If this is a linklocal address, compare the scope_id. */ 5061da177e4SLinus Torvalds if (ipv6_addr_type(&addr1->v6.sin6_addr) & IPV6_ADDR_LINKLOCAL) { 5071da177e4SLinus Torvalds if (addr1->v6.sin6_scope_id && addr2->v6.sin6_scope_id && 5081da177e4SLinus Torvalds (addr1->v6.sin6_scope_id != addr2->v6.sin6_scope_id)) { 5091da177e4SLinus Torvalds return 0; 5101da177e4SLinus Torvalds } 5111da177e4SLinus Torvalds } 5121da177e4SLinus Torvalds 5131da177e4SLinus Torvalds return 1; 5141da177e4SLinus Torvalds } 5151da177e4SLinus Torvalds 5161da177e4SLinus Torvalds /* Initialize addr struct to INADDR_ANY. */ 5176fbfa9f9SAl Viro static void sctp_v6_inaddr_any(union sctp_addr *addr, __be16 port) 5181da177e4SLinus Torvalds { 5191da177e4SLinus Torvalds memset(addr, 0x00, sizeof(union sctp_addr)); 5201da177e4SLinus Torvalds addr->v6.sin6_family = AF_INET6; 5211da177e4SLinus Torvalds addr->v6.sin6_port = port; 5221da177e4SLinus Torvalds } 5231da177e4SLinus Torvalds 5241da177e4SLinus Torvalds /* Is this a wildcard address? */ 5251da177e4SLinus Torvalds static int sctp_v6_is_any(const union sctp_addr *addr) 5261da177e4SLinus Torvalds { 527b9b9e10fSBrian Haley return ipv6_addr_any(&addr->v6.sin6_addr); 5281da177e4SLinus Torvalds } 5291da177e4SLinus Torvalds 5301da177e4SLinus Torvalds /* Should this be available for binding? */ 5311da177e4SLinus Torvalds static int sctp_v6_available(union sctp_addr *addr, struct sctp_sock *sp) 5321da177e4SLinus Torvalds { 5331da177e4SLinus Torvalds int type; 5341da177e4SLinus Torvalds struct in6_addr *in6 = (struct in6_addr *)&addr->v6.sin6_addr; 5351da177e4SLinus Torvalds 5361da177e4SLinus Torvalds type = ipv6_addr_type(in6); 5371da177e4SLinus Torvalds if (IPV6_ADDR_ANY == type) 5381da177e4SLinus Torvalds return 1; 5391da177e4SLinus Torvalds if (type == IPV6_ADDR_MAPPED) { 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)->available(addr, sp); 5461da177e4SLinus Torvalds } 5471da177e4SLinus Torvalds if (!(type & IPV6_ADDR_UNICAST)) 5481da177e4SLinus Torvalds return 0; 5491da177e4SLinus Torvalds 550bfeade08SDaniel Lezcano return ipv6_chk_addr(&init_net, in6, NULL, 0); 5511da177e4SLinus Torvalds } 5521da177e4SLinus Torvalds 5531da177e4SLinus Torvalds /* This function checks if the address is a valid address to be used for 5541da177e4SLinus Torvalds * SCTP. 5551da177e4SLinus Torvalds * 5561da177e4SLinus Torvalds * Output: 5571da177e4SLinus Torvalds * Return 0 - If the address is a non-unicast or an illegal address. 5581da177e4SLinus Torvalds * Return 1 - If the address is a unicast. 5591da177e4SLinus Torvalds */ 5605636bef7SVlad Yasevich static int sctp_v6_addr_valid(union sctp_addr *addr, 5615636bef7SVlad Yasevich struct sctp_sock *sp, 5625636bef7SVlad Yasevich const struct sk_buff *skb) 5631da177e4SLinus Torvalds { 5641da177e4SLinus Torvalds int ret = ipv6_addr_type(&addr->v6.sin6_addr); 5651da177e4SLinus Torvalds 5661da177e4SLinus Torvalds /* Support v4-mapped-v6 address. */ 5671da177e4SLinus Torvalds if (ret == IPV6_ADDR_MAPPED) { 5681da177e4SLinus Torvalds /* Note: This routine is used in input, so v4-mapped-v6 5691da177e4SLinus Torvalds * are disallowed here when there is no sctp_sock. 5701da177e4SLinus Torvalds */ 5711da177e4SLinus Torvalds if (!sp || !sp->v4mapped) 5721da177e4SLinus Torvalds return 0; 5731da177e4SLinus Torvalds if (sp && ipv6_only_sock(sctp_opt2sk(sp))) 5741da177e4SLinus Torvalds return 0; 5751da177e4SLinus Torvalds sctp_v6_map_v4(addr); 5765636bef7SVlad Yasevich return sctp_get_af_specific(AF_INET)->addr_valid(addr, sp, skb); 5771da177e4SLinus Torvalds } 5781da177e4SLinus Torvalds 5791da177e4SLinus Torvalds /* Is this a non-unicast address */ 5801da177e4SLinus Torvalds if (!(ret & IPV6_ADDR_UNICAST)) 5811da177e4SLinus Torvalds return 0; 5821da177e4SLinus Torvalds 5831da177e4SLinus Torvalds return 1; 5841da177e4SLinus Torvalds } 5851da177e4SLinus Torvalds 5861da177e4SLinus Torvalds /* What is the scope of 'addr'? */ 5871da177e4SLinus Torvalds static sctp_scope_t sctp_v6_scope(union sctp_addr *addr) 5881da177e4SLinus Torvalds { 5891da177e4SLinus Torvalds int v6scope; 5901da177e4SLinus Torvalds sctp_scope_t retval; 5911da177e4SLinus Torvalds 5921da177e4SLinus Torvalds /* The IPv6 scope is really a set of bit fields. 5931da177e4SLinus Torvalds * See IFA_* in <net/if_inet6.h>. Map to a generic SCTP scope. 5941da177e4SLinus Torvalds */ 5951da177e4SLinus Torvalds 5961da177e4SLinus Torvalds v6scope = ipv6_addr_scope(&addr->v6.sin6_addr); 5971da177e4SLinus Torvalds switch (v6scope) { 5981da177e4SLinus Torvalds case IFA_HOST: 5991da177e4SLinus Torvalds retval = SCTP_SCOPE_LOOPBACK; 6001da177e4SLinus Torvalds break; 6011da177e4SLinus Torvalds case IFA_LINK: 6021da177e4SLinus Torvalds retval = SCTP_SCOPE_LINK; 6031da177e4SLinus Torvalds break; 6041da177e4SLinus Torvalds case IFA_SITE: 6051da177e4SLinus Torvalds retval = SCTP_SCOPE_PRIVATE; 6061da177e4SLinus Torvalds break; 6071da177e4SLinus Torvalds default: 6081da177e4SLinus Torvalds retval = SCTP_SCOPE_GLOBAL; 6091da177e4SLinus Torvalds break; 6103ff50b79SStephen Hemminger } 6111da177e4SLinus Torvalds 6121da177e4SLinus Torvalds return retval; 6131da177e4SLinus Torvalds } 6141da177e4SLinus Torvalds 6151da177e4SLinus Torvalds /* Create and initialize a new sk for the socket to be returned by accept(). */ 6161da177e4SLinus Torvalds static struct sock *sctp_v6_create_accept_sk(struct sock *sk, 6171da177e4SLinus Torvalds struct sctp_association *asoc) 6181da177e4SLinus Torvalds { 6191da177e4SLinus Torvalds struct sock *newsk; 6201da177e4SLinus Torvalds struct ipv6_pinfo *newnp, *np = inet6_sk(sk); 6211da177e4SLinus Torvalds struct sctp6_sock *newsctp6sk; 6221da177e4SLinus Torvalds 6233b1e0a65SYOSHIFUJI Hideaki newsk = sk_alloc(sock_net(sk), PF_INET6, GFP_KERNEL, sk->sk_prot); 6241da177e4SLinus Torvalds if (!newsk) 6251da177e4SLinus Torvalds goto out; 6261da177e4SLinus Torvalds 6271da177e4SLinus Torvalds sock_init_data(NULL, newsk); 6281da177e4SLinus Torvalds 629914e1c8bSVlad Yasevich sctp_copy_sock(newsk, sk, asoc); 6301da177e4SLinus Torvalds sock_reset_flag(sk, SOCK_ZAPPED); 6311da177e4SLinus Torvalds 6321da177e4SLinus Torvalds newsctp6sk = (struct sctp6_sock *)newsk; 6331da177e4SLinus Torvalds inet_sk(newsk)->pinet6 = &newsctp6sk->inet6; 6341da177e4SLinus Torvalds 635b225b884SDave Johnson sctp_sk(newsk)->v4mapped = sctp_sk(sk)->v4mapped; 636b225b884SDave Johnson 6371da177e4SLinus Torvalds newnp = inet6_sk(newsk); 6381da177e4SLinus Torvalds 6391da177e4SLinus Torvalds memcpy(newnp, np, sizeof(struct ipv6_pinfo)); 6401da177e4SLinus Torvalds 6411da177e4SLinus Torvalds /* Initialize sk's sport, dport, rcv_saddr and daddr for getsockname() 6421da177e4SLinus Torvalds * and getpeername(). 6431da177e4SLinus Torvalds */ 6441da177e4SLinus Torvalds sctp_v6_to_sk_daddr(&asoc->peer.primary_addr, newsk); 6451da177e4SLinus Torvalds 646e6848976SArnaldo Carvalho de Melo sk_refcnt_debug_inc(newsk); 6471da177e4SLinus Torvalds 6481da177e4SLinus Torvalds if (newsk->sk_prot->init(newsk)) { 6491da177e4SLinus Torvalds sk_common_release(newsk); 6501da177e4SLinus Torvalds newsk = NULL; 6511da177e4SLinus Torvalds } 6521da177e4SLinus Torvalds 6531da177e4SLinus Torvalds out: 6541da177e4SLinus Torvalds return newsk; 6551da177e4SLinus Torvalds } 6561da177e4SLinus Torvalds 6571da177e4SLinus Torvalds /* Map v4 address to mapped v6 address */ 6581da177e4SLinus Torvalds static void sctp_v6_addr_v4map(struct sctp_sock *sp, union sctp_addr *addr) 6591da177e4SLinus Torvalds { 6601da177e4SLinus Torvalds if (sp->v4mapped && AF_INET == addr->sa.sa_family) 6611da177e4SLinus Torvalds sctp_v4_map_v6(addr); 6621da177e4SLinus Torvalds } 6631da177e4SLinus Torvalds 6641da177e4SLinus Torvalds /* Where did this skb come from? */ 6651da177e4SLinus Torvalds static int sctp_v6_skb_iif(const struct sk_buff *skb) 6661da177e4SLinus Torvalds { 6671da177e4SLinus Torvalds struct inet6_skb_parm *opt = (struct inet6_skb_parm *) skb->cb; 6681da177e4SLinus Torvalds return opt->iif; 6691da177e4SLinus Torvalds } 6701da177e4SLinus Torvalds 6711da177e4SLinus Torvalds /* Was this packet marked by Explicit Congestion Notification? */ 6721da177e4SLinus Torvalds static int sctp_v6_is_ce(const struct sk_buff *skb) 6731da177e4SLinus Torvalds { 6740660e03fSArnaldo Carvalho de Melo return *((__u32 *)(ipv6_hdr(skb))) & htonl(1 << 20); 6751da177e4SLinus Torvalds } 6761da177e4SLinus Torvalds 6771da177e4SLinus Torvalds /* Dump the v6 addr to the seq file. */ 6781da177e4SLinus Torvalds static void sctp_v6_seq_dump_addr(struct seq_file *seq, union sctp_addr *addr) 6791da177e4SLinus Torvalds { 6805b095d98SHarvey Harrison seq_printf(seq, "%pI6 ", &addr->v6.sin6_addr); 6811da177e4SLinus Torvalds } 6821da177e4SLinus Torvalds 683b9031d9dSVlad Yasevich static void sctp_v6_ecn_capable(struct sock *sk) 684b9031d9dSVlad Yasevich { 685b9031d9dSVlad Yasevich inet6_sk(sk)->tclass |= INET_ECN_ECT_0; 686b9031d9dSVlad Yasevich } 687b9031d9dSVlad Yasevich 6881da177e4SLinus Torvalds /* Initialize a PF_INET6 socket msg_name. */ 6891da177e4SLinus Torvalds static void sctp_inet6_msgname(char *msgname, int *addr_len) 6901da177e4SLinus Torvalds { 6911da177e4SLinus Torvalds struct sockaddr_in6 *sin6; 6921da177e4SLinus Torvalds 6931da177e4SLinus Torvalds sin6 = (struct sockaddr_in6 *)msgname; 6941da177e4SLinus Torvalds sin6->sin6_family = AF_INET6; 6951da177e4SLinus Torvalds sin6->sin6_flowinfo = 0; 6961da177e4SLinus Torvalds sin6->sin6_scope_id = 0; /*FIXME */ 6971da177e4SLinus Torvalds *addr_len = sizeof(struct sockaddr_in6); 6981da177e4SLinus Torvalds } 6991da177e4SLinus Torvalds 7001da177e4SLinus Torvalds /* Initialize a PF_INET msgname from a ulpevent. */ 7011da177e4SLinus Torvalds static void sctp_inet6_event_msgname(struct sctp_ulpevent *event, 7021da177e4SLinus Torvalds char *msgname, int *addrlen) 7031da177e4SLinus Torvalds { 7041da177e4SLinus Torvalds struct sockaddr_in6 *sin6, *sin6from; 7051da177e4SLinus Torvalds 7061da177e4SLinus Torvalds if (msgname) { 7071da177e4SLinus Torvalds union sctp_addr *addr; 7081da177e4SLinus Torvalds struct sctp_association *asoc; 7091da177e4SLinus Torvalds 7101da177e4SLinus Torvalds asoc = event->asoc; 7111da177e4SLinus Torvalds sctp_inet6_msgname(msgname, addrlen); 7121da177e4SLinus Torvalds sin6 = (struct sockaddr_in6 *)msgname; 7131da177e4SLinus Torvalds sin6->sin6_port = htons(asoc->peer.port); 7141da177e4SLinus Torvalds addr = &asoc->peer.primary_addr; 7151da177e4SLinus Torvalds 7161da177e4SLinus Torvalds /* Note: If we go to a common v6 format, this code 7171da177e4SLinus Torvalds * will change. 7181da177e4SLinus Torvalds */ 7191da177e4SLinus Torvalds 7201da177e4SLinus Torvalds /* Map ipv4 address into v4-mapped-on-v6 address. */ 7211da177e4SLinus Torvalds if (sctp_sk(asoc->base.sk)->v4mapped && 7221da177e4SLinus Torvalds AF_INET == addr->sa.sa_family) { 7231da177e4SLinus Torvalds sctp_v4_map_v6((union sctp_addr *)sin6); 7241da177e4SLinus Torvalds sin6->sin6_addr.s6_addr32[3] = 7251da177e4SLinus Torvalds addr->v4.sin_addr.s_addr; 7261da177e4SLinus Torvalds return; 7271da177e4SLinus Torvalds } 7281da177e4SLinus Torvalds 7291da177e4SLinus Torvalds sin6from = &asoc->peer.primary_addr.v6; 7301da177e4SLinus Torvalds ipv6_addr_copy(&sin6->sin6_addr, &sin6from->sin6_addr); 7311da177e4SLinus Torvalds if (ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL) 7321da177e4SLinus Torvalds sin6->sin6_scope_id = sin6from->sin6_scope_id; 7331da177e4SLinus Torvalds } 7341da177e4SLinus Torvalds } 7351da177e4SLinus Torvalds 7361da177e4SLinus Torvalds /* Initialize a msg_name from an inbound skb. */ 7371da177e4SLinus Torvalds static void sctp_inet6_skb_msgname(struct sk_buff *skb, char *msgname, 7381da177e4SLinus Torvalds int *addr_len) 7391da177e4SLinus Torvalds { 7401da177e4SLinus Torvalds struct sctphdr *sh; 7411da177e4SLinus Torvalds struct sockaddr_in6 *sin6; 7421da177e4SLinus Torvalds 7431da177e4SLinus Torvalds if (msgname) { 7441da177e4SLinus Torvalds sctp_inet6_msgname(msgname, addr_len); 7451da177e4SLinus Torvalds sin6 = (struct sockaddr_in6 *)msgname; 7462c0fd387SArnaldo Carvalho de Melo sh = sctp_hdr(skb); 7471da177e4SLinus Torvalds sin6->sin6_port = sh->source; 7481da177e4SLinus Torvalds 7491da177e4SLinus Torvalds /* Map ipv4 address into v4-mapped-on-v6 address. */ 7501da177e4SLinus Torvalds if (sctp_sk(skb->sk)->v4mapped && 751eddc9ec5SArnaldo Carvalho de Melo ip_hdr(skb)->version == 4) { 7521da177e4SLinus Torvalds sctp_v4_map_v6((union sctp_addr *)sin6); 753eddc9ec5SArnaldo Carvalho de Melo sin6->sin6_addr.s6_addr32[3] = ip_hdr(skb)->saddr; 7541da177e4SLinus Torvalds return; 7551da177e4SLinus Torvalds } 7561da177e4SLinus Torvalds 7571da177e4SLinus Torvalds /* Otherwise, just copy the v6 address. */ 7580660e03fSArnaldo Carvalho de Melo ipv6_addr_copy(&sin6->sin6_addr, &ipv6_hdr(skb)->saddr); 7591da177e4SLinus Torvalds if (ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL) { 7601da177e4SLinus Torvalds struct sctp_ulpevent *ev = sctp_skb2event(skb); 7611da177e4SLinus Torvalds sin6->sin6_scope_id = ev->iif; 7621da177e4SLinus Torvalds } 7631da177e4SLinus Torvalds } 7641da177e4SLinus Torvalds } 7651da177e4SLinus Torvalds 7661da177e4SLinus Torvalds /* Do we support this AF? */ 7671da177e4SLinus Torvalds static int sctp_inet6_af_supported(sa_family_t family, struct sctp_sock *sp) 7681da177e4SLinus Torvalds { 7691da177e4SLinus Torvalds switch (family) { 7701da177e4SLinus Torvalds case AF_INET6: 7711da177e4SLinus Torvalds return 1; 7721da177e4SLinus Torvalds /* v4-mapped-v6 addresses */ 7731da177e4SLinus Torvalds case AF_INET: 7747dab83deSVlad Yasevich if (!__ipv6_only_sock(sctp_opt2sk(sp))) 7751da177e4SLinus Torvalds return 1; 7761da177e4SLinus Torvalds default: 7771da177e4SLinus Torvalds return 0; 7781da177e4SLinus Torvalds } 7791da177e4SLinus Torvalds } 7801da177e4SLinus Torvalds 7811da177e4SLinus Torvalds /* Address matching with wildcards allowed. This extra level 7821da177e4SLinus Torvalds * of indirection lets us choose whether a PF_INET6 should 7831da177e4SLinus Torvalds * disallow any v4 addresses if we so choose. 7841da177e4SLinus Torvalds */ 7851da177e4SLinus Torvalds static int sctp_inet6_cmp_addr(const union sctp_addr *addr1, 7861da177e4SLinus Torvalds const union sctp_addr *addr2, 7871da177e4SLinus Torvalds struct sctp_sock *opt) 7881da177e4SLinus Torvalds { 7891da177e4SLinus Torvalds struct sctp_af *af1, *af2; 79052cae8f0SVlad Yasevich struct sock *sk = sctp_opt2sk(opt); 7911da177e4SLinus Torvalds 7921da177e4SLinus Torvalds af1 = sctp_get_af_specific(addr1->sa.sa_family); 7931da177e4SLinus Torvalds af2 = sctp_get_af_specific(addr2->sa.sa_family); 7941da177e4SLinus Torvalds 7951da177e4SLinus Torvalds if (!af1 || !af2) 7961da177e4SLinus Torvalds return 0; 7977dab83deSVlad Yasevich 7987dab83deSVlad Yasevich /* If the socket is IPv6 only, v4 addrs will not match */ 79952cae8f0SVlad Yasevich if (__ipv6_only_sock(sk) && af1 != af2) 8007dab83deSVlad Yasevich return 0; 8017dab83deSVlad Yasevich 8021da177e4SLinus Torvalds /* Today, wildcard AF_INET/AF_INET6. */ 80352cae8f0SVlad Yasevich if (sctp_is_any(sk, addr1) || sctp_is_any(sk, addr2)) 8041da177e4SLinus Torvalds return 1; 8051da177e4SLinus Torvalds 8061da177e4SLinus Torvalds if (addr1->sa.sa_family != addr2->sa.sa_family) 8071da177e4SLinus Torvalds return 0; 8081da177e4SLinus Torvalds 8091da177e4SLinus Torvalds return af1->cmp_addr(addr1, addr2); 8101da177e4SLinus Torvalds } 8111da177e4SLinus Torvalds 8121da177e4SLinus Torvalds /* Verify that the provided sockaddr looks bindable. Common verification, 8131da177e4SLinus Torvalds * has already been taken care of. 8141da177e4SLinus Torvalds */ 8151da177e4SLinus Torvalds static int sctp_inet6_bind_verify(struct sctp_sock *opt, union sctp_addr *addr) 8161da177e4SLinus Torvalds { 8171da177e4SLinus Torvalds struct sctp_af *af; 8181da177e4SLinus Torvalds 8191da177e4SLinus Torvalds /* ASSERT: address family has already been verified. */ 8201da177e4SLinus Torvalds if (addr->sa.sa_family != AF_INET6) 8211da177e4SLinus Torvalds af = sctp_get_af_specific(addr->sa.sa_family); 8221da177e4SLinus Torvalds else { 8231da177e4SLinus Torvalds int type = ipv6_addr_type(&addr->v6.sin6_addr); 8246a6ddb2aSSridhar Samudrala struct net_device *dev; 8251da177e4SLinus Torvalds 8266a6ddb2aSSridhar Samudrala if (type & IPV6_ADDR_LINKLOCAL) { 8276a6ddb2aSSridhar Samudrala if (!addr->v6.sin6_scope_id) 8281da177e4SLinus Torvalds return 0; 82940c9c31eSEric Dumazet rcu_read_lock(); 83040c9c31eSEric Dumazet dev = dev_get_by_index_rcu(&init_net, 83140c9c31eSEric Dumazet addr->v6.sin6_scope_id); 83240c9c31eSEric Dumazet if (!dev || 83340c9c31eSEric Dumazet !ipv6_chk_addr(&init_net, &addr->v6.sin6_addr, 834bfeade08SDaniel Lezcano dev, 0)) { 83540c9c31eSEric Dumazet rcu_read_unlock(); 8361669d857SVlad Yasevich return 0; 8371669d857SVlad Yasevich } 83840c9c31eSEric Dumazet rcu_read_unlock(); 8397dab83deSVlad Yasevich } else if (type == IPV6_ADDR_MAPPED) { 8407dab83deSVlad Yasevich if (!opt->v4mapped) 8417dab83deSVlad Yasevich return 0; 8421da177e4SLinus Torvalds } 8437dab83deSVlad Yasevich 8441da177e4SLinus Torvalds af = opt->pf->af; 8451da177e4SLinus Torvalds } 8461da177e4SLinus Torvalds return af->available(addr, opt); 8471da177e4SLinus Torvalds } 8481da177e4SLinus Torvalds 8496a6ddb2aSSridhar Samudrala /* Verify that the provided sockaddr looks sendable. Common verification, 8501da177e4SLinus Torvalds * has already been taken care of. 8511da177e4SLinus Torvalds */ 8521da177e4SLinus Torvalds static int sctp_inet6_send_verify(struct sctp_sock *opt, union sctp_addr *addr) 8531da177e4SLinus Torvalds { 8541da177e4SLinus Torvalds struct sctp_af *af = NULL; 8551da177e4SLinus Torvalds 8561da177e4SLinus Torvalds /* ASSERT: address family has already been verified. */ 8571da177e4SLinus Torvalds if (addr->sa.sa_family != AF_INET6) 8581da177e4SLinus Torvalds af = sctp_get_af_specific(addr->sa.sa_family); 8591da177e4SLinus Torvalds else { 8601da177e4SLinus Torvalds int type = ipv6_addr_type(&addr->v6.sin6_addr); 8616a6ddb2aSSridhar Samudrala struct net_device *dev; 8621da177e4SLinus Torvalds 8636a6ddb2aSSridhar Samudrala if (type & IPV6_ADDR_LINKLOCAL) { 8646a6ddb2aSSridhar Samudrala if (!addr->v6.sin6_scope_id) 8651da177e4SLinus Torvalds return 0; 86640c9c31eSEric Dumazet rcu_read_lock(); 86740c9c31eSEric Dumazet dev = dev_get_by_index_rcu(&init_net, 86840c9c31eSEric Dumazet addr->v6.sin6_scope_id); 86940c9c31eSEric Dumazet rcu_read_unlock(); 8706a6ddb2aSSridhar Samudrala if (!dev) 8716a6ddb2aSSridhar Samudrala return 0; 8721da177e4SLinus Torvalds } 8731da177e4SLinus Torvalds af = opt->pf->af; 8741da177e4SLinus Torvalds } 8751da177e4SLinus Torvalds 8761da177e4SLinus Torvalds return af != NULL; 8771da177e4SLinus Torvalds } 8781da177e4SLinus Torvalds 8791da177e4SLinus Torvalds /* Fill in Supported Address Type information for INIT and INIT-ACK 8801da177e4SLinus Torvalds * chunks. Note: In the future, we may want to look at sock options 8811da177e4SLinus Torvalds * to determine whether a PF_INET6 socket really wants to have IPV4 8821da177e4SLinus Torvalds * addresses. 8831da177e4SLinus Torvalds * Returns number of addresses supported. 8841da177e4SLinus Torvalds */ 8851da177e4SLinus Torvalds static int sctp_inet6_supported_addrs(const struct sctp_sock *opt, 8863dbe8656SAl Viro __be16 *types) 8871da177e4SLinus Torvalds { 8887dab83deSVlad Yasevich types[0] = SCTP_PARAM_IPV6_ADDRESS; 8897dab83deSVlad Yasevich if (!opt || !ipv6_only_sock(sctp_opt2sk(opt))) { 8907dab83deSVlad Yasevich types[1] = SCTP_PARAM_IPV4_ADDRESS; 8911da177e4SLinus Torvalds return 2; 8921da177e4SLinus Torvalds } 8937dab83deSVlad Yasevich return 1; 8947dab83deSVlad Yasevich } 8951da177e4SLinus Torvalds 89690ddc4f0SEric Dumazet static const struct proto_ops inet6_seqpacket_ops = { 8971da177e4SLinus Torvalds .family = PF_INET6, 8981da177e4SLinus Torvalds .owner = THIS_MODULE, 8991da177e4SLinus Torvalds .release = inet6_release, 9001da177e4SLinus Torvalds .bind = inet6_bind, 9011da177e4SLinus Torvalds .connect = inet_dgram_connect, 9021da177e4SLinus Torvalds .socketpair = sock_no_socketpair, 9031da177e4SLinus Torvalds .accept = inet_accept, 9041da177e4SLinus Torvalds .getname = inet6_getname, 9051da177e4SLinus Torvalds .poll = sctp_poll, 9061da177e4SLinus Torvalds .ioctl = inet6_ioctl, 9071da177e4SLinus Torvalds .listen = sctp_inet_listen, 9081da177e4SLinus Torvalds .shutdown = inet_shutdown, 9091da177e4SLinus Torvalds .setsockopt = sock_common_setsockopt, 9101da177e4SLinus Torvalds .getsockopt = sock_common_getsockopt, 911543d9cfeSArnaldo Carvalho de Melo .sendmsg = inet_sendmsg, 912543d9cfeSArnaldo Carvalho de Melo .recvmsg = sock_common_recvmsg, 913543d9cfeSArnaldo Carvalho de Melo .mmap = sock_no_mmap, 9143fdadf7dSDmitry Mishin #ifdef CONFIG_COMPAT 9153fdadf7dSDmitry Mishin .compat_setsockopt = compat_sock_common_setsockopt, 9163fdadf7dSDmitry Mishin .compat_getsockopt = compat_sock_common_getsockopt, 9173fdadf7dSDmitry Mishin #endif 9181da177e4SLinus Torvalds }; 9191da177e4SLinus Torvalds 9201da177e4SLinus Torvalds static struct inet_protosw sctpv6_seqpacket_protosw = { 9211da177e4SLinus Torvalds .type = SOCK_SEQPACKET, 9221da177e4SLinus Torvalds .protocol = IPPROTO_SCTP, 9231da177e4SLinus Torvalds .prot = &sctpv6_prot, 9241da177e4SLinus Torvalds .ops = &inet6_seqpacket_ops, 9251da177e4SLinus Torvalds .no_check = 0, 9261da177e4SLinus Torvalds .flags = SCTP_PROTOSW_FLAG 9271da177e4SLinus Torvalds }; 9281da177e4SLinus Torvalds static struct inet_protosw sctpv6_stream_protosw = { 9291da177e4SLinus Torvalds .type = SOCK_STREAM, 9301da177e4SLinus Torvalds .protocol = IPPROTO_SCTP, 9311da177e4SLinus Torvalds .prot = &sctpv6_prot, 9321da177e4SLinus Torvalds .ops = &inet6_seqpacket_ops, 9331da177e4SLinus Torvalds .no_check = 0, 9341da177e4SLinus Torvalds .flags = SCTP_PROTOSW_FLAG, 9351da177e4SLinus Torvalds }; 9361da177e4SLinus Torvalds 937e5bbef20SHerbert Xu static int sctp6_rcv(struct sk_buff *skb) 9381da177e4SLinus Torvalds { 939e5bbef20SHerbert Xu return sctp_rcv(skb) ? -1 : 0; 9401da177e4SLinus Torvalds } 9411da177e4SLinus Torvalds 94241135cc8SAlexey Dobriyan static const struct inet6_protocol sctpv6_protocol = { 9431da177e4SLinus Torvalds .handler = sctp6_rcv, 9441da177e4SLinus Torvalds .err_handler = sctp_v6_err, 9451da177e4SLinus Torvalds .flags = INET6_PROTO_NOPOLICY | INET6_PROTO_FINAL, 9461da177e4SLinus Torvalds }; 9471da177e4SLinus Torvalds 94815efbe76SNeil Horman static struct sctp_af sctp_af_inet6 = { 949543d9cfeSArnaldo Carvalho de Melo .sa_family = AF_INET6, 9501da177e4SLinus Torvalds .sctp_xmit = sctp_v6_xmit, 9511da177e4SLinus Torvalds .setsockopt = ipv6_setsockopt, 9521da177e4SLinus Torvalds .getsockopt = ipv6_getsockopt, 9531da177e4SLinus Torvalds .get_dst = sctp_v6_get_dst, 9541da177e4SLinus Torvalds .get_saddr = sctp_v6_get_saddr, 9551da177e4SLinus Torvalds .copy_addrlist = sctp_v6_copy_addrlist, 9561da177e4SLinus Torvalds .from_skb = sctp_v6_from_skb, 9571da177e4SLinus Torvalds .from_sk = sctp_v6_from_sk, 9581da177e4SLinus Torvalds .to_sk_saddr = sctp_v6_to_sk_saddr, 9591da177e4SLinus Torvalds .to_sk_daddr = sctp_v6_to_sk_daddr, 9601da177e4SLinus Torvalds .from_addr_param = sctp_v6_from_addr_param, 9611da177e4SLinus Torvalds .to_addr_param = sctp_v6_to_addr_param, 9621da177e4SLinus Torvalds .dst_saddr = sctp_v6_dst_saddr, 9631da177e4SLinus Torvalds .cmp_addr = sctp_v6_cmp_addr, 9641da177e4SLinus Torvalds .scope = sctp_v6_scope, 9651da177e4SLinus Torvalds .addr_valid = sctp_v6_addr_valid, 9661da177e4SLinus Torvalds .inaddr_any = sctp_v6_inaddr_any, 9671da177e4SLinus Torvalds .is_any = sctp_v6_is_any, 9681da177e4SLinus Torvalds .available = sctp_v6_available, 9691da177e4SLinus Torvalds .skb_iif = sctp_v6_skb_iif, 9701da177e4SLinus Torvalds .is_ce = sctp_v6_is_ce, 9711da177e4SLinus Torvalds .seq_dump_addr = sctp_v6_seq_dump_addr, 972b9031d9dSVlad Yasevich .ecn_capable = sctp_v6_ecn_capable, 9731da177e4SLinus Torvalds .net_header_len = sizeof(struct ipv6hdr), 9741da177e4SLinus Torvalds .sockaddr_len = sizeof(struct sockaddr_in6), 975543d9cfeSArnaldo Carvalho de Melo #ifdef CONFIG_COMPAT 976543d9cfeSArnaldo Carvalho de Melo .compat_setsockopt = compat_ipv6_setsockopt, 977543d9cfeSArnaldo Carvalho de Melo .compat_getsockopt = compat_ipv6_getsockopt, 978543d9cfeSArnaldo Carvalho de Melo #endif 9791da177e4SLinus Torvalds }; 9801da177e4SLinus Torvalds 98115efbe76SNeil Horman static struct sctp_pf sctp_pf_inet6 = { 9821da177e4SLinus Torvalds .event_msgname = sctp_inet6_event_msgname, 9831da177e4SLinus Torvalds .skb_msgname = sctp_inet6_skb_msgname, 9841da177e4SLinus Torvalds .af_supported = sctp_inet6_af_supported, 9851da177e4SLinus Torvalds .cmp_addr = sctp_inet6_cmp_addr, 9861da177e4SLinus Torvalds .bind_verify = sctp_inet6_bind_verify, 9871da177e4SLinus Torvalds .send_verify = sctp_inet6_send_verify, 9881da177e4SLinus Torvalds .supported_addrs = sctp_inet6_supported_addrs, 9891da177e4SLinus Torvalds .create_accept_sk = sctp_v6_create_accept_sk, 9901da177e4SLinus Torvalds .addr_v4map = sctp_v6_addr_v4map, 99115efbe76SNeil Horman .af = &sctp_af_inet6, 9921da177e4SLinus Torvalds }; 9931da177e4SLinus Torvalds 994827bf122SSridhar Samudrala /* Initialize IPv6 support and register with socket layer. */ 995270637abSVlad Yasevich void sctp_v6_pf_init(void) 9961da177e4SLinus Torvalds { 9971da177e4SLinus Torvalds /* Register the SCTP specific PF_INET6 functions. */ 99815efbe76SNeil Horman sctp_register_pf(&sctp_pf_inet6, PF_INET6); 9991da177e4SLinus Torvalds 10001da177e4SLinus Torvalds /* Register the SCTP specific AF_INET6 functions. */ 100115efbe76SNeil Horman sctp_register_af(&sctp_af_inet6); 1002270637abSVlad Yasevich } 1003270637abSVlad Yasevich 1004270637abSVlad Yasevich void sctp_v6_pf_exit(void) 1005270637abSVlad Yasevich { 1006270637abSVlad Yasevich list_del(&sctp_af_inet6.list); 1007270637abSVlad Yasevich } 1008270637abSVlad Yasevich 1009270637abSVlad Yasevich /* Initialize IPv6 support and register with socket layer. */ 1010270637abSVlad Yasevich int sctp_v6_protosw_init(void) 1011270637abSVlad Yasevich { 1012270637abSVlad Yasevich int rc; 10131da177e4SLinus Torvalds 1014827bf122SSridhar Samudrala rc = proto_register(&sctpv6_prot, 1); 1015827bf122SSridhar Samudrala if (rc) 1016827bf122SSridhar Samudrala return rc; 1017827bf122SSridhar Samudrala 1018827bf122SSridhar Samudrala /* Add SCTPv6(UDP and TCP style) to inetsw6 linked list. */ 1019827bf122SSridhar Samudrala inet6_register_protosw(&sctpv6_seqpacket_protosw); 1020827bf122SSridhar Samudrala inet6_register_protosw(&sctpv6_stream_protosw); 1021827bf122SSridhar Samudrala 1022827bf122SSridhar Samudrala return 0; 1023827bf122SSridhar Samudrala } 1024827bf122SSridhar Samudrala 1025270637abSVlad Yasevich void sctp_v6_protosw_exit(void) 1026270637abSVlad Yasevich { 1027270637abSVlad Yasevich inet6_unregister_protosw(&sctpv6_seqpacket_protosw); 1028270637abSVlad Yasevich inet6_unregister_protosw(&sctpv6_stream_protosw); 1029270637abSVlad Yasevich proto_unregister(&sctpv6_prot); 1030270637abSVlad Yasevich } 1031270637abSVlad Yasevich 1032270637abSVlad Yasevich 1033827bf122SSridhar Samudrala /* Register with inet6 layer. */ 1034827bf122SSridhar Samudrala int sctp_v6_add_protocol(void) 1035827bf122SSridhar Samudrala { 10361da177e4SLinus Torvalds /* Register notifier for inet6 address additions/deletions. */ 10371da177e4SLinus Torvalds register_inet6addr_notifier(&sctp_inet6addr_notifier); 1038827bf122SSridhar Samudrala 1039827bf122SSridhar Samudrala if (inet6_add_protocol(&sctpv6_protocol, IPPROTO_SCTP) < 0) 1040827bf122SSridhar Samudrala return -EAGAIN; 1041827bf122SSridhar Samudrala 1042827bf122SSridhar Samudrala return 0; 10431da177e4SLinus Torvalds } 10441da177e4SLinus Torvalds 1045827bf122SSridhar Samudrala /* Unregister with inet6 layer. */ 1046827bf122SSridhar Samudrala void sctp_v6_del_protocol(void) 1047827bf122SSridhar Samudrala { 1048827bf122SSridhar Samudrala inet6_del_protocol(&sctpv6_protocol, IPPROTO_SCTP); 1049827bf122SSridhar Samudrala unregister_inet6addr_notifier(&sctp_inet6addr_notifier); 10501da177e4SLinus Torvalds } 1051