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): 3091705c61SDaniel Borkmann * lksctp developers <linux-sctp@vger.kernel.org> 311da177e4SLinus Torvalds * 321da177e4SLinus Torvalds * Written or modified by: 331da177e4SLinus Torvalds * Le Yanqun <yanqun.le@nokia.com> 341da177e4SLinus Torvalds * Hui Huang <hui.huang@nokia.com> 351da177e4SLinus Torvalds * La Monte H.P. Yarroll <piggy@acm.org> 361da177e4SLinus Torvalds * Sridhar Samudrala <sri@us.ibm.com> 371da177e4SLinus Torvalds * Jon Grimm <jgrimm@us.ibm.com> 381da177e4SLinus Torvalds * Ardelle Fan <ardelle.fan@intel.com> 391da177e4SLinus Torvalds * 401da177e4SLinus Torvalds * Based on: 411da177e4SLinus Torvalds * linux/net/ipv6/tcp_ipv6.c 421da177e4SLinus Torvalds */ 431da177e4SLinus Torvalds 44145ce502SJoe Perches #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 45145ce502SJoe Perches 461da177e4SLinus Torvalds #include <linux/module.h> 471da177e4SLinus Torvalds #include <linux/errno.h> 481da177e4SLinus Torvalds #include <linux/types.h> 491da177e4SLinus Torvalds #include <linux/socket.h> 501da177e4SLinus Torvalds #include <linux/sockios.h> 511da177e4SLinus Torvalds #include <linux/net.h> 521da177e4SLinus Torvalds #include <linux/in.h> 531da177e4SLinus Torvalds #include <linux/in6.h> 541da177e4SLinus Torvalds #include <linux/netdevice.h> 551da177e4SLinus Torvalds #include <linux/init.h> 561da177e4SLinus Torvalds #include <linux/ipsec.h> 575a0e3ad6STejun Heo #include <linux/slab.h> 581da177e4SLinus Torvalds 591da177e4SLinus Torvalds #include <linux/ipv6.h> 601da177e4SLinus Torvalds #include <linux/icmpv6.h> 611da177e4SLinus Torvalds #include <linux/random.h> 621da177e4SLinus Torvalds #include <linux/seq_file.h> 631da177e4SLinus Torvalds 641da177e4SLinus Torvalds #include <net/protocol.h> 651da177e4SLinus Torvalds #include <net/ndisc.h> 66c752f073SArnaldo Carvalho de Melo #include <net/ip.h> 671da177e4SLinus Torvalds #include <net/ipv6.h> 681da177e4SLinus Torvalds #include <net/transp_v6.h> 691da177e4SLinus Torvalds #include <net/addrconf.h> 701da177e4SLinus Torvalds #include <net/ip6_route.h> 711da177e4SLinus Torvalds #include <net/inet_common.h> 721da177e4SLinus Torvalds #include <net/inet_ecn.h> 731da177e4SLinus Torvalds #include <net/sctp/sctp.h> 741da177e4SLinus Torvalds 751da177e4SLinus Torvalds #include <asm/uaccess.h> 761da177e4SLinus Torvalds 7762503411SWeixing Shi static inline int sctp_v6_addr_match_len(union sctp_addr *s1, 7862503411SWeixing Shi union sctp_addr *s2); 799914ae3cSVlad Yasevich static void sctp_v6_to_addr(union sctp_addr *addr, struct in6_addr *saddr, 809914ae3cSVlad Yasevich __be16 port); 819914ae3cSVlad Yasevich static int sctp_v6_cmp_addr(const union sctp_addr *addr1, 829914ae3cSVlad Yasevich const union sctp_addr *addr2); 8362503411SWeixing Shi 8429303547SVlad Yasevich /* Event handler for inet6 address addition/deletion events. 8529303547SVlad Yasevich * The sctp_local_addr_list needs to be protocted by a spin lock since 8629303547SVlad Yasevich * multiple notifiers (say IPv4 and IPv6) may be running at the same 8729303547SVlad Yasevich * time and thus corrupt the list. 8829303547SVlad Yasevich * The reader side is protected with RCU. 8929303547SVlad Yasevich */ 9024123186SAdrian Bunk static int sctp_inet6addr_event(struct notifier_block *this, unsigned long ev, 9129c7cf96SSridhar Samudrala void *ptr) 9229c7cf96SSridhar Samudrala { 9329c7cf96SSridhar Samudrala struct inet6_ifaddr *ifa = (struct inet6_ifaddr *)ptr; 9429303547SVlad Yasevich struct sctp_sockaddr_entry *addr = NULL; 9529303547SVlad Yasevich struct sctp_sockaddr_entry *temp; 964db67e80SEric W. Biederman struct net *net = dev_net(ifa->idev->dev); 9722626216SChidambar 'ilLogict' Zinnoury int found = 0; 9829c7cf96SSridhar Samudrala 9929c7cf96SSridhar Samudrala switch (ev) { 10029c7cf96SSridhar Samudrala case NETDEV_UP: 10129c7cf96SSridhar Samudrala addr = kmalloc(sizeof(struct sctp_sockaddr_entry), GFP_ATOMIC); 10229c7cf96SSridhar Samudrala if (addr) { 10329c7cf96SSridhar Samudrala addr->a.v6.sin6_family = AF_INET6; 10429c7cf96SSridhar Samudrala addr->a.v6.sin6_port = 0; 1054e3fd7a0SAlexey Dobriyan addr->a.v6.sin6_addr = ifa->addr; 10629c7cf96SSridhar Samudrala addr->a.v6.sin6_scope_id = ifa->idev->dev->ifindex; 10729303547SVlad Yasevich addr->valid = 1; 1084db67e80SEric W. Biederman spin_lock_bh(&net->sctp.local_addr_lock); 1094db67e80SEric W. Biederman list_add_tail_rcu(&addr->list, &net->sctp.local_addr_list); 1104db67e80SEric W. Biederman sctp_addr_wq_mgmt(net, addr, SCTP_ADDR_NEW); 1114db67e80SEric W. Biederman spin_unlock_bh(&net->sctp.local_addr_lock); 11229c7cf96SSridhar Samudrala } 11329c7cf96SSridhar Samudrala break; 11429c7cf96SSridhar Samudrala case NETDEV_DOWN: 1154db67e80SEric W. Biederman spin_lock_bh(&net->sctp.local_addr_lock); 11629303547SVlad Yasevich list_for_each_entry_safe(addr, temp, 1174db67e80SEric W. Biederman &net->sctp.local_addr_list, list) { 118a40a7d15SPavel Emelyanov if (addr->a.sa.sa_family == AF_INET6 && 119a40a7d15SPavel Emelyanov ipv6_addr_equal(&addr->a.v6.sin6_addr, 12029303547SVlad Yasevich &ifa->addr)) { 1214db67e80SEric W. Biederman sctp_addr_wq_mgmt(net, addr, SCTP_ADDR_DEL); 12222626216SChidambar 'ilLogict' Zinnoury found = 1; 12329303547SVlad Yasevich addr->valid = 0; 12429303547SVlad Yasevich list_del_rcu(&addr->list); 12529c7cf96SSridhar Samudrala break; 12629c7cf96SSridhar Samudrala } 12729c7cf96SSridhar Samudrala } 1284db67e80SEric W. Biederman spin_unlock_bh(&net->sctp.local_addr_lock); 12922626216SChidambar 'ilLogict' Zinnoury if (found) 1301231f0baSLai Jiangshan kfree_rcu(addr, rcu); 13129c7cf96SSridhar Samudrala break; 13229c7cf96SSridhar Samudrala } 13329c7cf96SSridhar Samudrala 13429c7cf96SSridhar Samudrala return NOTIFY_DONE; 13529c7cf96SSridhar Samudrala } 13629c7cf96SSridhar Samudrala 1371da177e4SLinus Torvalds static struct notifier_block sctp_inet6addr_notifier = { 13829c7cf96SSridhar Samudrala .notifier_call = sctp_inet6addr_event, 1391da177e4SLinus Torvalds }; 1401da177e4SLinus Torvalds 1411da177e4SLinus Torvalds /* ICMP error handler. */ 142dda91928SDaniel Borkmann static void sctp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, 143d5fdd6baSBrian Haley u8 type, u8 code, int offset, __be32 info) 1441da177e4SLinus Torvalds { 1451da177e4SLinus Torvalds struct inet6_dev *idev; 1461da177e4SLinus Torvalds struct sock *sk; 1471da177e4SLinus Torvalds struct sctp_association *asoc; 1481da177e4SLinus Torvalds struct sctp_transport *transport; 1491da177e4SLinus Torvalds struct ipv6_pinfo *np; 1502c928e0eSSimon Horman __u16 saveip, savesctp; 1511da177e4SLinus Torvalds int err; 1524110cc25SEric W. Biederman struct net *net = dev_net(skb->dev); 1531da177e4SLinus Torvalds 1541da177e4SLinus Torvalds idev = in6_dev_get(skb->dev); 1551da177e4SLinus Torvalds 1561da177e4SLinus Torvalds /* Fix up skb to look at the embedded net header. */ 157b0e380b1SArnaldo Carvalho de Melo saveip = skb->network_header; 158b0e380b1SArnaldo Carvalho de Melo savesctp = skb->transport_header; 1591ced98e8SArnaldo Carvalho de Melo skb_reset_network_header(skb); 160a27ef749SArnaldo Carvalho de Melo skb_set_transport_header(skb, offset); 1614110cc25SEric W. Biederman sk = sctp_err_lookup(net, AF_INET6, skb, sctp_hdr(skb), &asoc, &transport); 1621da177e4SLinus Torvalds /* Put back, the original pointers. */ 163b0e380b1SArnaldo Carvalho de Melo skb->network_header = saveip; 164b0e380b1SArnaldo Carvalho de Melo skb->transport_header = savesctp; 1651da177e4SLinus Torvalds if (!sk) { 166b01a2407SEric W. Biederman ICMP6_INC_STATS_BH(net, idev, ICMP6_MIB_INERRORS); 1671da177e4SLinus Torvalds goto out; 1681da177e4SLinus Torvalds } 1691da177e4SLinus Torvalds 1701da177e4SLinus Torvalds /* Warning: The sock lock is held. Remember to call 1711da177e4SLinus Torvalds * sctp_err_finish! 1721da177e4SLinus Torvalds */ 1731da177e4SLinus Torvalds 1741da177e4SLinus Torvalds switch (type) { 1751da177e4SLinus Torvalds case ICMPV6_PKT_TOOBIG: 1761da177e4SLinus Torvalds sctp_icmp_frag_needed(sk, asoc, transport, ntohl(info)); 1771da177e4SLinus Torvalds goto out_unlock; 1781da177e4SLinus Torvalds case ICMPV6_PARAMPROB: 1791da177e4SLinus Torvalds if (ICMPV6_UNK_NEXTHDR == code) { 180d1ad1ff2SSridhar Samudrala sctp_icmp_proto_unreachable(sk, asoc, transport); 1811da177e4SLinus Torvalds goto out_unlock; 1821da177e4SLinus Torvalds } 1831da177e4SLinus Torvalds break; 184ec18d9a2SDavid S. Miller case NDISC_REDIRECT: 185ec18d9a2SDavid S. Miller sctp_icmp_redirect(sk, transport, skb); 1863f96a532SDaniel Borkmann goto out_unlock; 1871da177e4SLinus Torvalds default: 1881da177e4SLinus Torvalds break; 1891da177e4SLinus Torvalds } 1901da177e4SLinus Torvalds 1911da177e4SLinus Torvalds np = inet6_sk(sk); 1921da177e4SLinus Torvalds icmpv6_err_convert(type, code, &err); 1931da177e4SLinus Torvalds if (!sock_owned_by_user(sk) && np->recverr) { 1941da177e4SLinus Torvalds sk->sk_err = err; 1951da177e4SLinus Torvalds sk->sk_error_report(sk); 1961da177e4SLinus Torvalds } else { /* Only an error on timeout */ 1971da177e4SLinus Torvalds sk->sk_err_soft = err; 1981da177e4SLinus Torvalds } 1991da177e4SLinus Torvalds 2001da177e4SLinus Torvalds out_unlock: 201d1ad1ff2SSridhar Samudrala sctp_err_finish(sk, asoc); 2021da177e4SLinus Torvalds out: 2031da177e4SLinus Torvalds if (likely(idev != NULL)) 2041da177e4SLinus Torvalds in6_dev_put(idev); 2051da177e4SLinus Torvalds } 2061da177e4SLinus Torvalds 207f880374cSHerbert Xu static int sctp_v6_xmit(struct sk_buff *skb, struct sctp_transport *transport) 2081da177e4SLinus Torvalds { 2091da177e4SLinus Torvalds struct sock *sk = skb->sk; 2101da177e4SLinus Torvalds struct ipv6_pinfo *np = inet6_sk(sk); 21195ee6208SDaniel Borkmann struct flowi6 *fl6 = &transport->fl.u.ip6; 2121da177e4SLinus Torvalds 213bb33381dSDaniel Borkmann pr_debug("%s: skb:%p, len:%d, src:%pI6 dst:%pI6\n", __func__, skb, 21495ee6208SDaniel Borkmann skb->len, &fl6->saddr, &fl6->daddr); 2151da177e4SLinus Torvalds 21695ee6208SDaniel Borkmann IP6_ECN_flow_xmit(sk, fl6->flowlabel); 2171da177e4SLinus Torvalds 218f880374cSHerbert Xu if (!(transport->param_flags & SPP_PMTUD_ENABLE)) 219f880374cSHerbert Xu skb->local_df = 1; 220f880374cSHerbert Xu 22195ee6208SDaniel Borkmann SCTP_INC_STATS(sock_net(sk), SCTP_MIB_OUTSCTPPACKS); 22295ee6208SDaniel Borkmann 22395ee6208SDaniel Borkmann return ip6_xmit(sk, skb, fl6, np->opt, np->tclass); 2241da177e4SLinus Torvalds } 2251da177e4SLinus Torvalds 2261da177e4SLinus Torvalds /* Returns the dst cache entry for the given source and destination ip 2271da177e4SLinus Torvalds * addresses. 2281da177e4SLinus Torvalds */ 229da0420beSVlad Yasevich static void sctp_v6_get_dst(struct sctp_transport *t, union sctp_addr *saddr, 230da0420beSVlad Yasevich struct flowi *fl, struct sock *sk) 2311da177e4SLinus Torvalds { 232da0420beSVlad Yasevich struct sctp_association *asoc = t->asoc; 23362503411SWeixing Shi struct dst_entry *dst = NULL; 2349914ae3cSVlad Yasevich struct flowi6 *fl6 = &fl->u.ip6; 23562503411SWeixing Shi struct sctp_bind_addr *bp; 23695ee6208SDaniel Borkmann struct ipv6_pinfo *np = inet6_sk(sk); 23762503411SWeixing Shi struct sctp_sockaddr_entry *laddr; 23862503411SWeixing Shi union sctp_addr *baddr = NULL; 239da0420beSVlad Yasevich union sctp_addr *daddr = &t->ipaddr; 2409914ae3cSVlad Yasevich union sctp_addr dst_saddr; 24195ee6208SDaniel Borkmann struct in6_addr *final_p, final; 24262503411SWeixing Shi __u8 matchlen = 0; 24362503411SWeixing Shi __u8 bmatchlen; 24462503411SWeixing Shi sctp_scope_t scope; 2451da177e4SLinus Torvalds 2469914ae3cSVlad Yasevich memset(fl6, 0, sizeof(struct flowi6)); 2474e3fd7a0SAlexey Dobriyan fl6->daddr = daddr->v6.sin6_addr; 2489c6a02f4SVlad Yasevich fl6->fl6_dport = daddr->v6.sin6_port; 2499c6a02f4SVlad Yasevich fl6->flowi6_proto = IPPROTO_SCTP; 2501da177e4SLinus Torvalds if (ipv6_addr_type(&daddr->v6.sin6_addr) & IPV6_ADDR_LINKLOCAL) 2519914ae3cSVlad Yasevich fl6->flowi6_oif = daddr->v6.sin6_scope_id; 2521da177e4SLinus Torvalds 253bb33381dSDaniel Borkmann pr_debug("%s: dst=%pI6 ", __func__, &fl6->daddr); 2541da177e4SLinus Torvalds 2559c6a02f4SVlad Yasevich if (asoc) 2569c6a02f4SVlad Yasevich fl6->fl6_sport = htons(asoc->base.bind_addr.port); 2571da177e4SLinus Torvalds 2581da177e4SLinus Torvalds if (saddr) { 2594e3fd7a0SAlexey Dobriyan fl6->saddr = saddr->v6.sin6_addr; 2609c6a02f4SVlad Yasevich fl6->fl6_sport = saddr->v6.sin6_port; 261bb33381dSDaniel Borkmann 262bb33381dSDaniel Borkmann pr_debug("src=%pI6 - ", &fl6->saddr); 2631da177e4SLinus Torvalds } 2641da177e4SLinus Torvalds 26595ee6208SDaniel Borkmann final_p = fl6_update_dst(fl6, np->opt, &final); 26695ee6208SDaniel Borkmann dst = ip6_dst_lookup_flow(sk, fl6, final_p, false); 26762503411SWeixing Shi if (!asoc || saddr) 26862503411SWeixing Shi goto out; 26962503411SWeixing Shi 27062503411SWeixing Shi bp = &asoc->base.bind_addr; 27162503411SWeixing Shi scope = sctp_scope(daddr); 2729914ae3cSVlad Yasevich /* ip6_dst_lookup has filled in the fl6->saddr for us. Check 2739914ae3cSVlad Yasevich * to see if we can use it. 2749914ae3cSVlad Yasevich */ 2759c6a02f4SVlad Yasevich if (!IS_ERR(dst)) { 2769914ae3cSVlad Yasevich /* Walk through the bind address list and look for a bind 2779914ae3cSVlad Yasevich * address that matches the source address of the returned dst. 2789914ae3cSVlad Yasevich */ 2799914ae3cSVlad Yasevich sctp_v6_to_addr(&dst_saddr, &fl6->saddr, htons(bp->port)); 2809914ae3cSVlad Yasevich rcu_read_lock(); 2819914ae3cSVlad Yasevich list_for_each_entry_rcu(laddr, &bp->address_list, list) { 2829914ae3cSVlad Yasevich if (!laddr->valid || (laddr->state != SCTP_ADDR_SRC)) 2839914ae3cSVlad Yasevich continue; 2849914ae3cSVlad Yasevich 2859914ae3cSVlad Yasevich /* Do not compare against v4 addrs */ 2869914ae3cSVlad Yasevich if ((laddr->a.sa.sa_family == AF_INET6) && 2879914ae3cSVlad Yasevich (sctp_v6_cmp_addr(&dst_saddr, &laddr->a))) { 2889914ae3cSVlad Yasevich rcu_read_unlock(); 2899914ae3cSVlad Yasevich goto out; 2909914ae3cSVlad Yasevich } 2919914ae3cSVlad Yasevich } 2929914ae3cSVlad Yasevich rcu_read_unlock(); 2939914ae3cSVlad Yasevich /* None of the bound addresses match the source address of the 2949914ae3cSVlad Yasevich * dst. So release it. 2959914ae3cSVlad Yasevich */ 2969914ae3cSVlad Yasevich dst_release(dst); 2979914ae3cSVlad Yasevich dst = NULL; 2989914ae3cSVlad Yasevich } 2999914ae3cSVlad Yasevich 3009914ae3cSVlad Yasevich /* Walk through the bind address list and try to get the 3019914ae3cSVlad Yasevich * best source address for a given destination. 30262503411SWeixing Shi */ 30362503411SWeixing Shi rcu_read_lock(); 30462503411SWeixing Shi list_for_each_entry_rcu(laddr, &bp->address_list, list) { 305e9c0dfbaSDaniel Borkmann if (!laddr->valid) 30662503411SWeixing Shi continue; 307e9c0dfbaSDaniel Borkmann if ((laddr->state == SCTP_ADDR_SRC) && 308e9c0dfbaSDaniel Borkmann (laddr->a.sa.sa_family == AF_INET6) && 30962503411SWeixing Shi (scope <= sctp_scope(&laddr->a))) { 3109914ae3cSVlad Yasevich bmatchlen = sctp_v6_addr_match_len(daddr, &laddr->a); 31162503411SWeixing Shi if (!baddr || (matchlen < bmatchlen)) { 31262503411SWeixing Shi baddr = &laddr->a; 31362503411SWeixing Shi matchlen = bmatchlen; 31462503411SWeixing Shi } 31562503411SWeixing Shi } 31662503411SWeixing Shi } 31762503411SWeixing Shi rcu_read_unlock(); 31895ee6208SDaniel Borkmann 31962503411SWeixing Shi if (baddr) { 3204e3fd7a0SAlexey Dobriyan fl6->saddr = baddr->v6.sin6_addr; 3219c6a02f4SVlad Yasevich fl6->fl6_sport = baddr->v6.sin6_port; 32295ee6208SDaniel Borkmann final_p = fl6_update_dst(fl6, np->opt, &final); 32395ee6208SDaniel Borkmann dst = ip6_dst_lookup_flow(sk, fl6, final_p, false); 32462503411SWeixing Shi } 3259914ae3cSVlad Yasevich 32662503411SWeixing Shi out: 327ee3f34e8STommi Rantala if (!IS_ERR_OR_NULL(dst)) { 3281da177e4SLinus Torvalds struct rt6_info *rt; 329bb33381dSDaniel Borkmann 3301da177e4SLinus Torvalds rt = (struct rt6_info *)dst; 331da0420beSVlad Yasevich t->dst = dst; 332d27fc782Sfan.du t->dst_cookie = rt->rt6i_node ? rt->rt6i_node->fn_sernum : 0; 333bb33381dSDaniel Borkmann pr_debug("rt6_dst:%pI6 rt6_src:%pI6\n", &rt->rt6i_dst.addr, 334bb33381dSDaniel Borkmann &fl6->saddr); 335da0420beSVlad Yasevich } else { 336da0420beSVlad Yasevich t->dst = NULL; 337bb33381dSDaniel Borkmann 338bb33381dSDaniel Borkmann pr_debug("no route\n"); 339da0420beSVlad Yasevich } 3404251320fSVille Nuorvala } 3411da177e4SLinus Torvalds 3421da177e4SLinus Torvalds /* Returns the number of consecutive initial bits that match in the 2 ipv6 3431da177e4SLinus Torvalds * addresses. 3441da177e4SLinus Torvalds */ 3451da177e4SLinus Torvalds static inline int sctp_v6_addr_match_len(union sctp_addr *s1, 3461da177e4SLinus Torvalds union sctp_addr *s2) 3471da177e4SLinus Torvalds { 348de7737e0SYOSHIFUJI Hideaki / 吉藤英明 return ipv6_addr_diff(&s1->v6.sin6_addr, &s2->v6.sin6_addr); 3491da177e4SLinus Torvalds } 3501da177e4SLinus Torvalds 3511da177e4SLinus Torvalds /* Fills in the source address(saddr) based on the destination address(daddr) 3521da177e4SLinus Torvalds * and asoc's bind address list. 3531da177e4SLinus Torvalds */ 354e5117101SYOSHIFUJI Hideaki static void sctp_v6_get_saddr(struct sctp_sock *sk, 3559914ae3cSVlad Yasevich struct sctp_transport *t, 3569914ae3cSVlad Yasevich struct flowi *fl) 3571da177e4SLinus Torvalds { 3589914ae3cSVlad Yasevich struct flowi6 *fl6 = &fl->u.ip6; 3599914ae3cSVlad Yasevich union sctp_addr *saddr = &t->saddr; 3601da177e4SLinus Torvalds 361bb33381dSDaniel Borkmann pr_debug("%s: asoc:%p dst:%p\n", __func__, t->asoc, t->dst); 3621da177e4SLinus Torvalds 3639914ae3cSVlad Yasevich if (t->dst) { 3649914ae3cSVlad Yasevich saddr->v6.sin6_family = AF_INET6; 3654e3fd7a0SAlexey Dobriyan saddr->v6.sin6_addr = fl6->saddr; 3661da177e4SLinus Torvalds } 3671da177e4SLinus Torvalds } 3681da177e4SLinus Torvalds 3691da177e4SLinus Torvalds /* Make a copy of all potential local addresses. */ 3701da177e4SLinus Torvalds static void sctp_v6_copy_addrlist(struct list_head *addrlist, 3711da177e4SLinus Torvalds struct net_device *dev) 3721da177e4SLinus Torvalds { 3731da177e4SLinus Torvalds struct inet6_dev *in6_dev; 3741da177e4SLinus Torvalds struct inet6_ifaddr *ifp; 3751da177e4SLinus Torvalds struct sctp_sockaddr_entry *addr; 3761da177e4SLinus Torvalds 3778814c4b5SYOSHIFUJI Hideaki rcu_read_lock(); 3781da177e4SLinus Torvalds if ((in6_dev = __in6_dev_get(dev)) == NULL) { 3798814c4b5SYOSHIFUJI Hideaki rcu_read_unlock(); 3801da177e4SLinus Torvalds return; 3811da177e4SLinus Torvalds } 3821da177e4SLinus Torvalds 383e2eb8d45SJarek Poplawski read_lock_bh(&in6_dev->lock); 384502a2ffdSstephen hemminger list_for_each_entry(ifp, &in6_dev->addr_list, if_list) { 3851da177e4SLinus Torvalds /* Add the address to the local list. */ 386939cfa75SDaniel Borkmann addr = kzalloc(sizeof(*addr), GFP_ATOMIC); 3871da177e4SLinus Torvalds if (addr) { 3882a6fd78aSAl Viro addr->a.v6.sin6_family = AF_INET6; 3892a6fd78aSAl Viro addr->a.v6.sin6_port = 0; 3904e3fd7a0SAlexey Dobriyan addr->a.v6.sin6_addr = ifp->addr; 3912a6fd78aSAl Viro addr->a.v6.sin6_scope_id = dev->ifindex; 39229303547SVlad Yasevich addr->valid = 1; 3931da177e4SLinus Torvalds INIT_LIST_HEAD(&addr->list); 3941da177e4SLinus Torvalds list_add_tail(&addr->list, addrlist); 3951da177e4SLinus Torvalds } 3961da177e4SLinus Torvalds } 3971da177e4SLinus Torvalds 398e2eb8d45SJarek Poplawski read_unlock_bh(&in6_dev->lock); 3998814c4b5SYOSHIFUJI Hideaki rcu_read_unlock(); 4001da177e4SLinus Torvalds } 4011da177e4SLinus Torvalds 4021da177e4SLinus Torvalds /* Initialize a sockaddr_storage from in incoming skb. */ 4031da177e4SLinus Torvalds static void sctp_v6_from_skb(union sctp_addr *addr,struct sk_buff *skb, 4041da177e4SLinus Torvalds int is_saddr) 4051da177e4SLinus Torvalds { 406d55c41b1SAl Viro __be16 *port; 4071da177e4SLinus Torvalds struct sctphdr *sh; 4081da177e4SLinus Torvalds 4091da177e4SLinus Torvalds port = &addr->v6.sin6_port; 4101da177e4SLinus Torvalds addr->v6.sin6_family = AF_INET6; 4111da177e4SLinus Torvalds addr->v6.sin6_flowinfo = 0; /* FIXME */ 4121da177e4SLinus Torvalds addr->v6.sin6_scope_id = ((struct inet6_skb_parm *)skb->cb)->iif; 4131da177e4SLinus Torvalds 4142c0fd387SArnaldo Carvalho de Melo sh = sctp_hdr(skb); 4151da177e4SLinus Torvalds if (is_saddr) { 416d55c41b1SAl Viro *port = sh->source; 4174e3fd7a0SAlexey Dobriyan addr->v6.sin6_addr = ipv6_hdr(skb)->saddr; 4181da177e4SLinus Torvalds } else { 419d55c41b1SAl Viro *port = sh->dest; 4204e3fd7a0SAlexey Dobriyan addr->v6.sin6_addr = ipv6_hdr(skb)->daddr; 4211da177e4SLinus Torvalds } 4221da177e4SLinus Torvalds } 4231da177e4SLinus Torvalds 4241da177e4SLinus Torvalds /* Initialize an sctp_addr from a socket. */ 4251da177e4SLinus Torvalds static void sctp_v6_from_sk(union sctp_addr *addr, struct sock *sk) 4261da177e4SLinus Torvalds { 4271da177e4SLinus Torvalds addr->v6.sin6_family = AF_INET6; 4287dcdbd95SAl Viro addr->v6.sin6_port = 0; 4294e3fd7a0SAlexey Dobriyan addr->v6.sin6_addr = inet6_sk(sk)->rcv_saddr; 4301da177e4SLinus Torvalds } 4311da177e4SLinus Torvalds 4321da177e4SLinus Torvalds /* Initialize sk->sk_rcv_saddr from sctp_addr. */ 4331da177e4SLinus Torvalds static void sctp_v6_to_sk_saddr(union sctp_addr *addr, struct sock *sk) 4341da177e4SLinus Torvalds { 4351da177e4SLinus Torvalds if (addr->sa.sa_family == AF_INET && sctp_sk(sk)->v4mapped) { 4361da177e4SLinus Torvalds inet6_sk(sk)->rcv_saddr.s6_addr32[0] = 0; 4371da177e4SLinus Torvalds inet6_sk(sk)->rcv_saddr.s6_addr32[1] = 0; 4381da177e4SLinus Torvalds inet6_sk(sk)->rcv_saddr.s6_addr32[2] = htonl(0x0000ffff); 4391da177e4SLinus Torvalds inet6_sk(sk)->rcv_saddr.s6_addr32[3] = 4401da177e4SLinus Torvalds addr->v4.sin_addr.s_addr; 4411da177e4SLinus Torvalds } else { 4424e3fd7a0SAlexey Dobriyan inet6_sk(sk)->rcv_saddr = addr->v6.sin6_addr; 4431da177e4SLinus Torvalds } 4441da177e4SLinus Torvalds } 4451da177e4SLinus Torvalds 4461da177e4SLinus Torvalds /* Initialize sk->sk_daddr from sctp_addr. */ 4471da177e4SLinus Torvalds static void sctp_v6_to_sk_daddr(union sctp_addr *addr, struct sock *sk) 4481da177e4SLinus Torvalds { 4491da177e4SLinus Torvalds if (addr->sa.sa_family == AF_INET && sctp_sk(sk)->v4mapped) { 4501da177e4SLinus Torvalds inet6_sk(sk)->daddr.s6_addr32[0] = 0; 4511da177e4SLinus Torvalds inet6_sk(sk)->daddr.s6_addr32[1] = 0; 4521da177e4SLinus Torvalds inet6_sk(sk)->daddr.s6_addr32[2] = htonl(0x0000ffff); 4531da177e4SLinus Torvalds inet6_sk(sk)->daddr.s6_addr32[3] = addr->v4.sin_addr.s_addr; 4541da177e4SLinus Torvalds } else { 4554e3fd7a0SAlexey Dobriyan inet6_sk(sk)->daddr = addr->v6.sin6_addr; 4561da177e4SLinus Torvalds } 4571da177e4SLinus Torvalds } 4581da177e4SLinus Torvalds 4591da177e4SLinus Torvalds /* Initialize a sctp_addr from an address parameter. */ 4601da177e4SLinus Torvalds static void sctp_v6_from_addr_param(union sctp_addr *addr, 4611da177e4SLinus Torvalds union sctp_addr_param *param, 462dd86d136SAl Viro __be16 port, int iif) 4631da177e4SLinus Torvalds { 4641da177e4SLinus Torvalds addr->v6.sin6_family = AF_INET6; 4651da177e4SLinus Torvalds addr->v6.sin6_port = port; 4661da177e4SLinus Torvalds addr->v6.sin6_flowinfo = 0; /* BUG */ 4674e3fd7a0SAlexey Dobriyan addr->v6.sin6_addr = param->v6.addr; 4681da177e4SLinus Torvalds addr->v6.sin6_scope_id = iif; 4691da177e4SLinus Torvalds } 4701da177e4SLinus Torvalds 4711da177e4SLinus Torvalds /* Initialize an address parameter from a sctp_addr and return the length 4721da177e4SLinus Torvalds * of the address parameter. 4731da177e4SLinus Torvalds */ 4741da177e4SLinus Torvalds static int sctp_v6_to_addr_param(const union sctp_addr *addr, 4751da177e4SLinus Torvalds union sctp_addr_param *param) 4761da177e4SLinus Torvalds { 4771da177e4SLinus Torvalds int length = sizeof(sctp_ipv6addr_param_t); 4781da177e4SLinus Torvalds 4791da177e4SLinus Torvalds param->v6.param_hdr.type = SCTP_PARAM_IPV6_ADDRESS; 480dbc16db1SAl Viro param->v6.param_hdr.length = htons(length); 4814e3fd7a0SAlexey Dobriyan param->v6.addr = addr->v6.sin6_addr; 4821da177e4SLinus Torvalds 4831da177e4SLinus Torvalds return length; 4841da177e4SLinus Torvalds } 4851da177e4SLinus Torvalds 4869914ae3cSVlad Yasevich /* Initialize a sctp_addr from struct in6_addr. */ 4879914ae3cSVlad Yasevich static void sctp_v6_to_addr(union sctp_addr *addr, struct in6_addr *saddr, 488854d43a4SAl Viro __be16 port) 4891da177e4SLinus Torvalds { 4901da177e4SLinus Torvalds addr->sa.sa_family = AF_INET6; 4911da177e4SLinus Torvalds addr->v6.sin6_port = port; 4924e3fd7a0SAlexey Dobriyan addr->v6.sin6_addr = *saddr; 4931da177e4SLinus Torvalds } 4941da177e4SLinus Torvalds 4951da177e4SLinus Torvalds /* Compare addresses exactly. 4961da177e4SLinus Torvalds * v4-mapped-v6 is also in consideration. 4971da177e4SLinus Torvalds */ 4981da177e4SLinus Torvalds static int sctp_v6_cmp_addr(const union sctp_addr *addr1, 4991da177e4SLinus Torvalds const union sctp_addr *addr2) 5001da177e4SLinus Torvalds { 5011da177e4SLinus Torvalds if (addr1->sa.sa_family != addr2->sa.sa_family) { 5021da177e4SLinus Torvalds if (addr1->sa.sa_family == AF_INET && 5031da177e4SLinus Torvalds addr2->sa.sa_family == AF_INET6 && 504e773e4faSBrian Haley ipv6_addr_v4mapped(&addr2->v6.sin6_addr)) { 5051da177e4SLinus Torvalds if (addr2->v6.sin6_port == addr1->v4.sin_port && 5061da177e4SLinus Torvalds addr2->v6.sin6_addr.s6_addr32[3] == 5071da177e4SLinus Torvalds addr1->v4.sin_addr.s_addr) 5081da177e4SLinus Torvalds return 1; 5091da177e4SLinus Torvalds } 5101da177e4SLinus Torvalds if (addr2->sa.sa_family == AF_INET && 5111da177e4SLinus Torvalds addr1->sa.sa_family == AF_INET6 && 512e773e4faSBrian Haley ipv6_addr_v4mapped(&addr1->v6.sin6_addr)) { 5131da177e4SLinus Torvalds if (addr1->v6.sin6_port == addr2->v4.sin_port && 5141da177e4SLinus Torvalds addr1->v6.sin6_addr.s6_addr32[3] == 5151da177e4SLinus Torvalds addr2->v4.sin_addr.s_addr) 5161da177e4SLinus Torvalds return 1; 5171da177e4SLinus Torvalds } 5181da177e4SLinus Torvalds return 0; 5191da177e4SLinus Torvalds } 5201da177e4SLinus Torvalds if (!ipv6_addr_equal(&addr1->v6.sin6_addr, &addr2->v6.sin6_addr)) 5211da177e4SLinus Torvalds return 0; 5221da177e4SLinus Torvalds /* If this is a linklocal address, compare the scope_id. */ 5231da177e4SLinus Torvalds if (ipv6_addr_type(&addr1->v6.sin6_addr) & IPV6_ADDR_LINKLOCAL) { 5241da177e4SLinus Torvalds if (addr1->v6.sin6_scope_id && addr2->v6.sin6_scope_id && 5251da177e4SLinus Torvalds (addr1->v6.sin6_scope_id != addr2->v6.sin6_scope_id)) { 5261da177e4SLinus Torvalds return 0; 5271da177e4SLinus Torvalds } 5281da177e4SLinus Torvalds } 5291da177e4SLinus Torvalds 5301da177e4SLinus Torvalds return 1; 5311da177e4SLinus Torvalds } 5321da177e4SLinus Torvalds 5331da177e4SLinus Torvalds /* Initialize addr struct to INADDR_ANY. */ 5346fbfa9f9SAl Viro static void sctp_v6_inaddr_any(union sctp_addr *addr, __be16 port) 5351da177e4SLinus Torvalds { 5361da177e4SLinus Torvalds memset(addr, 0x00, sizeof(union sctp_addr)); 5371da177e4SLinus Torvalds addr->v6.sin6_family = AF_INET6; 5381da177e4SLinus Torvalds addr->v6.sin6_port = port; 5391da177e4SLinus Torvalds } 5401da177e4SLinus Torvalds 5411da177e4SLinus Torvalds /* Is this a wildcard address? */ 5421da177e4SLinus Torvalds static int sctp_v6_is_any(const union sctp_addr *addr) 5431da177e4SLinus Torvalds { 544b9b9e10fSBrian Haley return ipv6_addr_any(&addr->v6.sin6_addr); 5451da177e4SLinus Torvalds } 5461da177e4SLinus Torvalds 5471da177e4SLinus Torvalds /* Should this be available for binding? */ 5481da177e4SLinus Torvalds static int sctp_v6_available(union sctp_addr *addr, struct sctp_sock *sp) 5491da177e4SLinus Torvalds { 5501da177e4SLinus Torvalds int type; 551b71d1d42SEric Dumazet const struct in6_addr *in6 = (const struct in6_addr *)&addr->v6.sin6_addr; 5521da177e4SLinus Torvalds 5531da177e4SLinus Torvalds type = ipv6_addr_type(in6); 5541da177e4SLinus Torvalds if (IPV6_ADDR_ANY == type) 5551da177e4SLinus Torvalds return 1; 5561da177e4SLinus Torvalds if (type == IPV6_ADDR_MAPPED) { 5571da177e4SLinus Torvalds if (sp && !sp->v4mapped) 5581da177e4SLinus Torvalds return 0; 5591da177e4SLinus Torvalds if (sp && ipv6_only_sock(sctp_opt2sk(sp))) 5601da177e4SLinus Torvalds return 0; 5611da177e4SLinus Torvalds sctp_v6_map_v4(addr); 5621da177e4SLinus Torvalds return sctp_get_af_specific(AF_INET)->available(addr, sp); 5631da177e4SLinus Torvalds } 5641da177e4SLinus Torvalds if (!(type & IPV6_ADDR_UNICAST)) 5651da177e4SLinus Torvalds return 0; 5661da177e4SLinus Torvalds 567bb2db45bSEric W. Biederman return ipv6_chk_addr(sock_net(&sp->inet.sk), in6, NULL, 0); 5681da177e4SLinus Torvalds } 5691da177e4SLinus Torvalds 5701da177e4SLinus Torvalds /* This function checks if the address is a valid address to be used for 5711da177e4SLinus Torvalds * SCTP. 5721da177e4SLinus Torvalds * 5731da177e4SLinus Torvalds * Output: 5741da177e4SLinus Torvalds * Return 0 - If the address is a non-unicast or an illegal address. 5751da177e4SLinus Torvalds * Return 1 - If the address is a unicast. 5761da177e4SLinus Torvalds */ 5775636bef7SVlad Yasevich static int sctp_v6_addr_valid(union sctp_addr *addr, 5785636bef7SVlad Yasevich struct sctp_sock *sp, 5795636bef7SVlad Yasevich const struct sk_buff *skb) 5801da177e4SLinus Torvalds { 5811da177e4SLinus Torvalds int ret = ipv6_addr_type(&addr->v6.sin6_addr); 5821da177e4SLinus Torvalds 5831da177e4SLinus Torvalds /* Support v4-mapped-v6 address. */ 5841da177e4SLinus Torvalds if (ret == IPV6_ADDR_MAPPED) { 5851da177e4SLinus Torvalds /* Note: This routine is used in input, so v4-mapped-v6 5861da177e4SLinus Torvalds * are disallowed here when there is no sctp_sock. 5871da177e4SLinus Torvalds */ 5881da177e4SLinus Torvalds if (!sp || !sp->v4mapped) 5891da177e4SLinus Torvalds return 0; 5901da177e4SLinus Torvalds if (sp && ipv6_only_sock(sctp_opt2sk(sp))) 5911da177e4SLinus Torvalds return 0; 5921da177e4SLinus Torvalds sctp_v6_map_v4(addr); 5935636bef7SVlad Yasevich return sctp_get_af_specific(AF_INET)->addr_valid(addr, sp, skb); 5941da177e4SLinus Torvalds } 5951da177e4SLinus Torvalds 5961da177e4SLinus Torvalds /* Is this a non-unicast address */ 5971da177e4SLinus Torvalds if (!(ret & IPV6_ADDR_UNICAST)) 5981da177e4SLinus Torvalds return 0; 5991da177e4SLinus Torvalds 6001da177e4SLinus Torvalds return 1; 6011da177e4SLinus Torvalds } 6021da177e4SLinus Torvalds 6031da177e4SLinus Torvalds /* What is the scope of 'addr'? */ 6041da177e4SLinus Torvalds static sctp_scope_t sctp_v6_scope(union sctp_addr *addr) 6051da177e4SLinus Torvalds { 6061da177e4SLinus Torvalds int v6scope; 6071da177e4SLinus Torvalds sctp_scope_t retval; 6081da177e4SLinus Torvalds 6091da177e4SLinus Torvalds /* The IPv6 scope is really a set of bit fields. 6101da177e4SLinus Torvalds * See IFA_* in <net/if_inet6.h>. Map to a generic SCTP scope. 6111da177e4SLinus Torvalds */ 6121da177e4SLinus Torvalds 6131da177e4SLinus Torvalds v6scope = ipv6_addr_scope(&addr->v6.sin6_addr); 6141da177e4SLinus Torvalds switch (v6scope) { 6151da177e4SLinus Torvalds case IFA_HOST: 6161da177e4SLinus Torvalds retval = SCTP_SCOPE_LOOPBACK; 6171da177e4SLinus Torvalds break; 6181da177e4SLinus Torvalds case IFA_LINK: 6191da177e4SLinus Torvalds retval = SCTP_SCOPE_LINK; 6201da177e4SLinus Torvalds break; 6211da177e4SLinus Torvalds case IFA_SITE: 6221da177e4SLinus Torvalds retval = SCTP_SCOPE_PRIVATE; 6231da177e4SLinus Torvalds break; 6241da177e4SLinus Torvalds default: 6251da177e4SLinus Torvalds retval = SCTP_SCOPE_GLOBAL; 6261da177e4SLinus Torvalds break; 6273ff50b79SStephen Hemminger } 6281da177e4SLinus Torvalds 6291da177e4SLinus Torvalds return retval; 6301da177e4SLinus Torvalds } 6311da177e4SLinus Torvalds 6321da177e4SLinus Torvalds /* Create and initialize a new sk for the socket to be returned by accept(). */ 6331da177e4SLinus Torvalds static struct sock *sctp_v6_create_accept_sk(struct sock *sk, 6341da177e4SLinus Torvalds struct sctp_association *asoc) 6351da177e4SLinus Torvalds { 6361da177e4SLinus Torvalds struct sock *newsk; 6371da177e4SLinus Torvalds struct ipv6_pinfo *newnp, *np = inet6_sk(sk); 6381da177e4SLinus Torvalds struct sctp6_sock *newsctp6sk; 6391da177e4SLinus Torvalds 6403b1e0a65SYOSHIFUJI Hideaki newsk = sk_alloc(sock_net(sk), PF_INET6, GFP_KERNEL, sk->sk_prot); 6411da177e4SLinus Torvalds if (!newsk) 6421da177e4SLinus Torvalds goto out; 6431da177e4SLinus Torvalds 6441da177e4SLinus Torvalds sock_init_data(NULL, newsk); 6451da177e4SLinus Torvalds 646914e1c8bSVlad Yasevich sctp_copy_sock(newsk, sk, asoc); 6471da177e4SLinus Torvalds sock_reset_flag(sk, SOCK_ZAPPED); 6481da177e4SLinus Torvalds 6491da177e4SLinus Torvalds newsctp6sk = (struct sctp6_sock *)newsk; 6501da177e4SLinus Torvalds inet_sk(newsk)->pinet6 = &newsctp6sk->inet6; 6511da177e4SLinus Torvalds 652b225b884SDave Johnson sctp_sk(newsk)->v4mapped = sctp_sk(sk)->v4mapped; 653b225b884SDave Johnson 6541da177e4SLinus Torvalds newnp = inet6_sk(newsk); 6551da177e4SLinus Torvalds 6561da177e4SLinus Torvalds memcpy(newnp, np, sizeof(struct ipv6_pinfo)); 6571da177e4SLinus Torvalds 6581da177e4SLinus Torvalds /* Initialize sk's sport, dport, rcv_saddr and daddr for getsockname() 6591da177e4SLinus Torvalds * and getpeername(). 6601da177e4SLinus Torvalds */ 6611da177e4SLinus Torvalds sctp_v6_to_sk_daddr(&asoc->peer.primary_addr, newsk); 6621da177e4SLinus Torvalds 663e6848976SArnaldo Carvalho de Melo sk_refcnt_debug_inc(newsk); 6641da177e4SLinus Torvalds 6651da177e4SLinus Torvalds if (newsk->sk_prot->init(newsk)) { 6661da177e4SLinus Torvalds sk_common_release(newsk); 6671da177e4SLinus Torvalds newsk = NULL; 6681da177e4SLinus Torvalds } 6691da177e4SLinus Torvalds 6701da177e4SLinus Torvalds out: 6711da177e4SLinus Torvalds return newsk; 6721da177e4SLinus Torvalds } 6731da177e4SLinus Torvalds 6741da177e4SLinus Torvalds /* Map v4 address to mapped v6 address */ 6751da177e4SLinus Torvalds static void sctp_v6_addr_v4map(struct sctp_sock *sp, union sctp_addr *addr) 6761da177e4SLinus Torvalds { 6771da177e4SLinus Torvalds if (sp->v4mapped && AF_INET == addr->sa.sa_family) 6781da177e4SLinus Torvalds sctp_v4_map_v6(addr); 6791da177e4SLinus Torvalds } 6801da177e4SLinus Torvalds 6811da177e4SLinus Torvalds /* Where did this skb come from? */ 6821da177e4SLinus Torvalds static int sctp_v6_skb_iif(const struct sk_buff *skb) 6831da177e4SLinus Torvalds { 6841da177e4SLinus Torvalds struct inet6_skb_parm *opt = (struct inet6_skb_parm *) skb->cb; 6851da177e4SLinus Torvalds return opt->iif; 6861da177e4SLinus Torvalds } 6871da177e4SLinus Torvalds 6881da177e4SLinus Torvalds /* Was this packet marked by Explicit Congestion Notification? */ 6891da177e4SLinus Torvalds static int sctp_v6_is_ce(const struct sk_buff *skb) 6901da177e4SLinus Torvalds { 6910660e03fSArnaldo Carvalho de Melo return *((__u32 *)(ipv6_hdr(skb))) & htonl(1 << 20); 6921da177e4SLinus Torvalds } 6931da177e4SLinus Torvalds 6941da177e4SLinus Torvalds /* Dump the v6 addr to the seq file. */ 6951da177e4SLinus Torvalds static void sctp_v6_seq_dump_addr(struct seq_file *seq, union sctp_addr *addr) 6961da177e4SLinus Torvalds { 6975b095d98SHarvey Harrison seq_printf(seq, "%pI6 ", &addr->v6.sin6_addr); 6981da177e4SLinus Torvalds } 6991da177e4SLinus Torvalds 700b9031d9dSVlad Yasevich static void sctp_v6_ecn_capable(struct sock *sk) 701b9031d9dSVlad Yasevich { 702b9031d9dSVlad Yasevich inet6_sk(sk)->tclass |= INET_ECN_ECT_0; 703b9031d9dSVlad Yasevich } 704b9031d9dSVlad Yasevich 7051da177e4SLinus Torvalds /* Initialize a PF_INET6 socket msg_name. */ 7061da177e4SLinus Torvalds static void sctp_inet6_msgname(char *msgname, int *addr_len) 7071da177e4SLinus Torvalds { 7081da177e4SLinus Torvalds struct sockaddr_in6 *sin6; 7091da177e4SLinus Torvalds 7101da177e4SLinus Torvalds sin6 = (struct sockaddr_in6 *)msgname; 7111da177e4SLinus Torvalds sin6->sin6_family = AF_INET6; 7121da177e4SLinus Torvalds sin6->sin6_flowinfo = 0; 7131da177e4SLinus Torvalds sin6->sin6_scope_id = 0; /*FIXME */ 7141da177e4SLinus Torvalds *addr_len = sizeof(struct sockaddr_in6); 7151da177e4SLinus Torvalds } 7161da177e4SLinus Torvalds 7171da177e4SLinus Torvalds /* Initialize a PF_INET msgname from a ulpevent. */ 7181da177e4SLinus Torvalds static void sctp_inet6_event_msgname(struct sctp_ulpevent *event, 7191da177e4SLinus Torvalds char *msgname, int *addrlen) 7201da177e4SLinus Torvalds { 7211da177e4SLinus Torvalds struct sockaddr_in6 *sin6, *sin6from; 7221da177e4SLinus Torvalds 7231da177e4SLinus Torvalds if (msgname) { 7241da177e4SLinus Torvalds union sctp_addr *addr; 7251da177e4SLinus Torvalds struct sctp_association *asoc; 7261da177e4SLinus Torvalds 7271da177e4SLinus Torvalds asoc = event->asoc; 7281da177e4SLinus Torvalds sctp_inet6_msgname(msgname, addrlen); 7291da177e4SLinus Torvalds sin6 = (struct sockaddr_in6 *)msgname; 7301da177e4SLinus Torvalds sin6->sin6_port = htons(asoc->peer.port); 7311da177e4SLinus Torvalds addr = &asoc->peer.primary_addr; 7321da177e4SLinus Torvalds 7331da177e4SLinus Torvalds /* Note: If we go to a common v6 format, this code 7341da177e4SLinus Torvalds * will change. 7351da177e4SLinus Torvalds */ 7361da177e4SLinus Torvalds 7371da177e4SLinus Torvalds /* Map ipv4 address into v4-mapped-on-v6 address. */ 7381da177e4SLinus Torvalds if (sctp_sk(asoc->base.sk)->v4mapped && 7391da177e4SLinus Torvalds AF_INET == addr->sa.sa_family) { 7401da177e4SLinus Torvalds sctp_v4_map_v6((union sctp_addr *)sin6); 7411da177e4SLinus Torvalds sin6->sin6_addr.s6_addr32[3] = 7421da177e4SLinus Torvalds addr->v4.sin_addr.s_addr; 7431da177e4SLinus Torvalds return; 7441da177e4SLinus Torvalds } 7451da177e4SLinus Torvalds 7461da177e4SLinus Torvalds sin6from = &asoc->peer.primary_addr.v6; 7474e3fd7a0SAlexey Dobriyan sin6->sin6_addr = sin6from->sin6_addr; 7481da177e4SLinus Torvalds if (ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL) 7491da177e4SLinus Torvalds sin6->sin6_scope_id = sin6from->sin6_scope_id; 7501da177e4SLinus Torvalds } 7511da177e4SLinus Torvalds } 7521da177e4SLinus Torvalds 7531da177e4SLinus Torvalds /* Initialize a msg_name from an inbound skb. */ 7541da177e4SLinus Torvalds static void sctp_inet6_skb_msgname(struct sk_buff *skb, char *msgname, 7551da177e4SLinus Torvalds int *addr_len) 7561da177e4SLinus Torvalds { 7571da177e4SLinus Torvalds struct sctphdr *sh; 7581da177e4SLinus Torvalds struct sockaddr_in6 *sin6; 7591da177e4SLinus Torvalds 7601da177e4SLinus Torvalds if (msgname) { 7611da177e4SLinus Torvalds sctp_inet6_msgname(msgname, addr_len); 7621da177e4SLinus Torvalds sin6 = (struct sockaddr_in6 *)msgname; 7632c0fd387SArnaldo Carvalho de Melo sh = sctp_hdr(skb); 7641da177e4SLinus Torvalds sin6->sin6_port = sh->source; 7651da177e4SLinus Torvalds 7661da177e4SLinus Torvalds /* Map ipv4 address into v4-mapped-on-v6 address. */ 7671da177e4SLinus Torvalds if (sctp_sk(skb->sk)->v4mapped && 768eddc9ec5SArnaldo Carvalho de Melo ip_hdr(skb)->version == 4) { 7691da177e4SLinus Torvalds sctp_v4_map_v6((union sctp_addr *)sin6); 770eddc9ec5SArnaldo Carvalho de Melo sin6->sin6_addr.s6_addr32[3] = ip_hdr(skb)->saddr; 7711da177e4SLinus Torvalds return; 7721da177e4SLinus Torvalds } 7731da177e4SLinus Torvalds 7741da177e4SLinus Torvalds /* Otherwise, just copy the v6 address. */ 7754e3fd7a0SAlexey Dobriyan sin6->sin6_addr = ipv6_hdr(skb)->saddr; 7761da177e4SLinus Torvalds if (ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL) { 7771da177e4SLinus Torvalds struct sctp_ulpevent *ev = sctp_skb2event(skb); 7781da177e4SLinus Torvalds sin6->sin6_scope_id = ev->iif; 7791da177e4SLinus Torvalds } 7801da177e4SLinus Torvalds } 7811da177e4SLinus Torvalds } 7821da177e4SLinus Torvalds 7831da177e4SLinus Torvalds /* Do we support this AF? */ 7841da177e4SLinus Torvalds static int sctp_inet6_af_supported(sa_family_t family, struct sctp_sock *sp) 7851da177e4SLinus Torvalds { 7861da177e4SLinus Torvalds switch (family) { 7871da177e4SLinus Torvalds case AF_INET6: 7881da177e4SLinus Torvalds return 1; 7891da177e4SLinus Torvalds /* v4-mapped-v6 addresses */ 7901da177e4SLinus Torvalds case AF_INET: 7917dab83deSVlad Yasevich if (!__ipv6_only_sock(sctp_opt2sk(sp))) 7921da177e4SLinus Torvalds return 1; 7931da177e4SLinus Torvalds default: 7941da177e4SLinus Torvalds return 0; 7951da177e4SLinus Torvalds } 7961da177e4SLinus Torvalds } 7971da177e4SLinus Torvalds 7981da177e4SLinus Torvalds /* Address matching with wildcards allowed. This extra level 7991da177e4SLinus Torvalds * of indirection lets us choose whether a PF_INET6 should 8001da177e4SLinus Torvalds * disallow any v4 addresses if we so choose. 8011da177e4SLinus Torvalds */ 8021da177e4SLinus Torvalds static int sctp_inet6_cmp_addr(const union sctp_addr *addr1, 8031da177e4SLinus Torvalds const union sctp_addr *addr2, 8041da177e4SLinus Torvalds struct sctp_sock *opt) 8051da177e4SLinus Torvalds { 8061da177e4SLinus Torvalds struct sctp_af *af1, *af2; 80752cae8f0SVlad Yasevich struct sock *sk = sctp_opt2sk(opt); 8081da177e4SLinus Torvalds 8091da177e4SLinus Torvalds af1 = sctp_get_af_specific(addr1->sa.sa_family); 8101da177e4SLinus Torvalds af2 = sctp_get_af_specific(addr2->sa.sa_family); 8111da177e4SLinus Torvalds 8121da177e4SLinus Torvalds if (!af1 || !af2) 8131da177e4SLinus Torvalds return 0; 8147dab83deSVlad Yasevich 8157dab83deSVlad Yasevich /* If the socket is IPv6 only, v4 addrs will not match */ 81652cae8f0SVlad Yasevich if (__ipv6_only_sock(sk) && af1 != af2) 8177dab83deSVlad Yasevich return 0; 8187dab83deSVlad Yasevich 8191da177e4SLinus Torvalds /* Today, wildcard AF_INET/AF_INET6. */ 82052cae8f0SVlad Yasevich if (sctp_is_any(sk, addr1) || sctp_is_any(sk, addr2)) 8211da177e4SLinus Torvalds return 1; 8221da177e4SLinus Torvalds 8231da177e4SLinus Torvalds if (addr1->sa.sa_family != addr2->sa.sa_family) 8241da177e4SLinus Torvalds return 0; 8251da177e4SLinus Torvalds 8261da177e4SLinus Torvalds return af1->cmp_addr(addr1, addr2); 8271da177e4SLinus Torvalds } 8281da177e4SLinus Torvalds 8291da177e4SLinus Torvalds /* Verify that the provided sockaddr looks bindable. Common verification, 8301da177e4SLinus Torvalds * has already been taken care of. 8311da177e4SLinus Torvalds */ 8321da177e4SLinus Torvalds static int sctp_inet6_bind_verify(struct sctp_sock *opt, union sctp_addr *addr) 8331da177e4SLinus Torvalds { 8341da177e4SLinus Torvalds struct sctp_af *af; 8351da177e4SLinus Torvalds 8361da177e4SLinus Torvalds /* ASSERT: address family has already been verified. */ 8371da177e4SLinus Torvalds if (addr->sa.sa_family != AF_INET6) 8381da177e4SLinus Torvalds af = sctp_get_af_specific(addr->sa.sa_family); 8391da177e4SLinus Torvalds else { 8401da177e4SLinus Torvalds int type = ipv6_addr_type(&addr->v6.sin6_addr); 8416a6ddb2aSSridhar Samudrala struct net_device *dev; 8421da177e4SLinus Torvalds 8436a6ddb2aSSridhar Samudrala if (type & IPV6_ADDR_LINKLOCAL) { 844bb2db45bSEric W. Biederman struct net *net; 8456a6ddb2aSSridhar Samudrala if (!addr->v6.sin6_scope_id) 8461da177e4SLinus Torvalds return 0; 847bb2db45bSEric W. Biederman net = sock_net(&opt->inet.sk); 84840c9c31eSEric Dumazet rcu_read_lock(); 849bb2db45bSEric W. Biederman dev = dev_get_by_index_rcu(net, addr->v6.sin6_scope_id); 85040c9c31eSEric Dumazet if (!dev || 851bb2db45bSEric W. Biederman !ipv6_chk_addr(net, &addr->v6.sin6_addr, dev, 0)) { 85240c9c31eSEric Dumazet rcu_read_unlock(); 8531669d857SVlad Yasevich return 0; 8541669d857SVlad Yasevich } 85540c9c31eSEric Dumazet rcu_read_unlock(); 8567dab83deSVlad Yasevich } else if (type == IPV6_ADDR_MAPPED) { 8577dab83deSVlad Yasevich if (!opt->v4mapped) 8587dab83deSVlad Yasevich return 0; 8591da177e4SLinus Torvalds } 8607dab83deSVlad Yasevich 8611da177e4SLinus Torvalds af = opt->pf->af; 8621da177e4SLinus Torvalds } 8631da177e4SLinus Torvalds return af->available(addr, opt); 8641da177e4SLinus Torvalds } 8651da177e4SLinus Torvalds 8666a6ddb2aSSridhar Samudrala /* Verify that the provided sockaddr looks sendable. Common verification, 8671da177e4SLinus Torvalds * has already been taken care of. 8681da177e4SLinus Torvalds */ 8691da177e4SLinus Torvalds static int sctp_inet6_send_verify(struct sctp_sock *opt, union sctp_addr *addr) 8701da177e4SLinus Torvalds { 8711da177e4SLinus Torvalds struct sctp_af *af = NULL; 8721da177e4SLinus Torvalds 8731da177e4SLinus Torvalds /* ASSERT: address family has already been verified. */ 8741da177e4SLinus Torvalds if (addr->sa.sa_family != AF_INET6) 8751da177e4SLinus Torvalds af = sctp_get_af_specific(addr->sa.sa_family); 8761da177e4SLinus Torvalds else { 8771da177e4SLinus Torvalds int type = ipv6_addr_type(&addr->v6.sin6_addr); 8786a6ddb2aSSridhar Samudrala struct net_device *dev; 8791da177e4SLinus Torvalds 8806a6ddb2aSSridhar Samudrala if (type & IPV6_ADDR_LINKLOCAL) { 8816a6ddb2aSSridhar Samudrala if (!addr->v6.sin6_scope_id) 8821da177e4SLinus Torvalds return 0; 88340c9c31eSEric Dumazet rcu_read_lock(); 884bb2db45bSEric W. Biederman dev = dev_get_by_index_rcu(sock_net(&opt->inet.sk), 88540c9c31eSEric Dumazet addr->v6.sin6_scope_id); 88640c9c31eSEric Dumazet rcu_read_unlock(); 8876a6ddb2aSSridhar Samudrala if (!dev) 8886a6ddb2aSSridhar Samudrala return 0; 8891da177e4SLinus Torvalds } 8901da177e4SLinus Torvalds af = opt->pf->af; 8911da177e4SLinus Torvalds } 8921da177e4SLinus Torvalds 8931da177e4SLinus Torvalds return af != NULL; 8941da177e4SLinus Torvalds } 8951da177e4SLinus Torvalds 8961da177e4SLinus Torvalds /* Fill in Supported Address Type information for INIT and INIT-ACK 8971da177e4SLinus Torvalds * chunks. Note: In the future, we may want to look at sock options 8981da177e4SLinus Torvalds * to determine whether a PF_INET6 socket really wants to have IPV4 8991da177e4SLinus Torvalds * addresses. 9001da177e4SLinus Torvalds * Returns number of addresses supported. 9011da177e4SLinus Torvalds */ 9021da177e4SLinus Torvalds static int sctp_inet6_supported_addrs(const struct sctp_sock *opt, 9033dbe8656SAl Viro __be16 *types) 9041da177e4SLinus Torvalds { 9057dab83deSVlad Yasevich types[0] = SCTP_PARAM_IPV6_ADDRESS; 9067dab83deSVlad Yasevich if (!opt || !ipv6_only_sock(sctp_opt2sk(opt))) { 9077dab83deSVlad Yasevich types[1] = SCTP_PARAM_IPV4_ADDRESS; 9081da177e4SLinus Torvalds return 2; 9091da177e4SLinus Torvalds } 9107dab83deSVlad Yasevich return 1; 9117dab83deSVlad Yasevich } 9121da177e4SLinus Torvalds 91390ddc4f0SEric Dumazet static const struct proto_ops inet6_seqpacket_ops = { 9141da177e4SLinus Torvalds .family = PF_INET6, 9151da177e4SLinus Torvalds .owner = THIS_MODULE, 9161da177e4SLinus Torvalds .release = inet6_release, 9171da177e4SLinus Torvalds .bind = inet6_bind, 9181da177e4SLinus Torvalds .connect = inet_dgram_connect, 9191da177e4SLinus Torvalds .socketpair = sock_no_socketpair, 9201da177e4SLinus Torvalds .accept = inet_accept, 9211da177e4SLinus Torvalds .getname = inet6_getname, 9221da177e4SLinus Torvalds .poll = sctp_poll, 9231da177e4SLinus Torvalds .ioctl = inet6_ioctl, 9241da177e4SLinus Torvalds .listen = sctp_inet_listen, 9251da177e4SLinus Torvalds .shutdown = inet_shutdown, 9261da177e4SLinus Torvalds .setsockopt = sock_common_setsockopt, 9271da177e4SLinus Torvalds .getsockopt = sock_common_getsockopt, 928543d9cfeSArnaldo Carvalho de Melo .sendmsg = inet_sendmsg, 929543d9cfeSArnaldo Carvalho de Melo .recvmsg = sock_common_recvmsg, 930543d9cfeSArnaldo Carvalho de Melo .mmap = sock_no_mmap, 9313fdadf7dSDmitry Mishin #ifdef CONFIG_COMPAT 9323fdadf7dSDmitry Mishin .compat_setsockopt = compat_sock_common_setsockopt, 9333fdadf7dSDmitry Mishin .compat_getsockopt = compat_sock_common_getsockopt, 9343fdadf7dSDmitry Mishin #endif 9351da177e4SLinus Torvalds }; 9361da177e4SLinus Torvalds 9371da177e4SLinus Torvalds static struct inet_protosw sctpv6_seqpacket_protosw = { 9381da177e4SLinus Torvalds .type = SOCK_SEQPACKET, 9391da177e4SLinus Torvalds .protocol = IPPROTO_SCTP, 9401da177e4SLinus Torvalds .prot = &sctpv6_prot, 9411da177e4SLinus Torvalds .ops = &inet6_seqpacket_ops, 9421da177e4SLinus Torvalds .no_check = 0, 9431da177e4SLinus Torvalds .flags = SCTP_PROTOSW_FLAG 9441da177e4SLinus Torvalds }; 9451da177e4SLinus Torvalds static struct inet_protosw sctpv6_stream_protosw = { 9461da177e4SLinus Torvalds .type = SOCK_STREAM, 9471da177e4SLinus Torvalds .protocol = IPPROTO_SCTP, 9481da177e4SLinus Torvalds .prot = &sctpv6_prot, 9491da177e4SLinus Torvalds .ops = &inet6_seqpacket_ops, 9501da177e4SLinus Torvalds .no_check = 0, 9511da177e4SLinus Torvalds .flags = SCTP_PROTOSW_FLAG, 9521da177e4SLinus Torvalds }; 9531da177e4SLinus Torvalds 954e5bbef20SHerbert Xu static int sctp6_rcv(struct sk_buff *skb) 9551da177e4SLinus Torvalds { 956e5bbef20SHerbert Xu return sctp_rcv(skb) ? -1 : 0; 9571da177e4SLinus Torvalds } 9581da177e4SLinus Torvalds 95941135cc8SAlexey Dobriyan static const struct inet6_protocol sctpv6_protocol = { 9601da177e4SLinus Torvalds .handler = sctp6_rcv, 9611da177e4SLinus Torvalds .err_handler = sctp_v6_err, 9621da177e4SLinus Torvalds .flags = INET6_PROTO_NOPOLICY | INET6_PROTO_FINAL, 9631da177e4SLinus Torvalds }; 9641da177e4SLinus Torvalds 96515efbe76SNeil Horman static struct sctp_af sctp_af_inet6 = { 966543d9cfeSArnaldo Carvalho de Melo .sa_family = AF_INET6, 9671da177e4SLinus Torvalds .sctp_xmit = sctp_v6_xmit, 9681da177e4SLinus Torvalds .setsockopt = ipv6_setsockopt, 9691da177e4SLinus Torvalds .getsockopt = ipv6_getsockopt, 9701da177e4SLinus Torvalds .get_dst = sctp_v6_get_dst, 9711da177e4SLinus Torvalds .get_saddr = sctp_v6_get_saddr, 9721da177e4SLinus Torvalds .copy_addrlist = sctp_v6_copy_addrlist, 9731da177e4SLinus Torvalds .from_skb = sctp_v6_from_skb, 9741da177e4SLinus Torvalds .from_sk = sctp_v6_from_sk, 9751da177e4SLinus Torvalds .to_sk_saddr = sctp_v6_to_sk_saddr, 9761da177e4SLinus Torvalds .to_sk_daddr = sctp_v6_to_sk_daddr, 9771da177e4SLinus Torvalds .from_addr_param = sctp_v6_from_addr_param, 9781da177e4SLinus Torvalds .to_addr_param = sctp_v6_to_addr_param, 9791da177e4SLinus Torvalds .cmp_addr = sctp_v6_cmp_addr, 9801da177e4SLinus Torvalds .scope = sctp_v6_scope, 9811da177e4SLinus Torvalds .addr_valid = sctp_v6_addr_valid, 9821da177e4SLinus Torvalds .inaddr_any = sctp_v6_inaddr_any, 9831da177e4SLinus Torvalds .is_any = sctp_v6_is_any, 9841da177e4SLinus Torvalds .available = sctp_v6_available, 9851da177e4SLinus Torvalds .skb_iif = sctp_v6_skb_iif, 9861da177e4SLinus Torvalds .is_ce = sctp_v6_is_ce, 9871da177e4SLinus Torvalds .seq_dump_addr = sctp_v6_seq_dump_addr, 988b9031d9dSVlad Yasevich .ecn_capable = sctp_v6_ecn_capable, 9891da177e4SLinus Torvalds .net_header_len = sizeof(struct ipv6hdr), 9901da177e4SLinus Torvalds .sockaddr_len = sizeof(struct sockaddr_in6), 991543d9cfeSArnaldo Carvalho de Melo #ifdef CONFIG_COMPAT 992543d9cfeSArnaldo Carvalho de Melo .compat_setsockopt = compat_ipv6_setsockopt, 993543d9cfeSArnaldo Carvalho de Melo .compat_getsockopt = compat_ipv6_getsockopt, 994543d9cfeSArnaldo Carvalho de Melo #endif 9951da177e4SLinus Torvalds }; 9961da177e4SLinus Torvalds 99715efbe76SNeil Horman static struct sctp_pf sctp_pf_inet6 = { 9981da177e4SLinus Torvalds .event_msgname = sctp_inet6_event_msgname, 9991da177e4SLinus Torvalds .skb_msgname = sctp_inet6_skb_msgname, 10001da177e4SLinus Torvalds .af_supported = sctp_inet6_af_supported, 10011da177e4SLinus Torvalds .cmp_addr = sctp_inet6_cmp_addr, 10021da177e4SLinus Torvalds .bind_verify = sctp_inet6_bind_verify, 10031da177e4SLinus Torvalds .send_verify = sctp_inet6_send_verify, 10041da177e4SLinus Torvalds .supported_addrs = sctp_inet6_supported_addrs, 10051da177e4SLinus Torvalds .create_accept_sk = sctp_v6_create_accept_sk, 10061da177e4SLinus Torvalds .addr_v4map = sctp_v6_addr_v4map, 100715efbe76SNeil Horman .af = &sctp_af_inet6, 10081da177e4SLinus Torvalds }; 10091da177e4SLinus Torvalds 1010827bf122SSridhar Samudrala /* Initialize IPv6 support and register with socket layer. */ 1011270637abSVlad Yasevich void sctp_v6_pf_init(void) 10121da177e4SLinus Torvalds { 10131da177e4SLinus Torvalds /* Register the SCTP specific PF_INET6 functions. */ 101415efbe76SNeil Horman sctp_register_pf(&sctp_pf_inet6, PF_INET6); 10151da177e4SLinus Torvalds 10161da177e4SLinus Torvalds /* Register the SCTP specific AF_INET6 functions. */ 101715efbe76SNeil Horman sctp_register_af(&sctp_af_inet6); 1018270637abSVlad Yasevich } 1019270637abSVlad Yasevich 1020270637abSVlad Yasevich void sctp_v6_pf_exit(void) 1021270637abSVlad Yasevich { 1022270637abSVlad Yasevich list_del(&sctp_af_inet6.list); 1023270637abSVlad Yasevich } 1024270637abSVlad Yasevich 1025270637abSVlad Yasevich /* Initialize IPv6 support and register with socket layer. */ 1026270637abSVlad Yasevich int sctp_v6_protosw_init(void) 1027270637abSVlad Yasevich { 1028270637abSVlad Yasevich int rc; 10291da177e4SLinus Torvalds 1030827bf122SSridhar Samudrala rc = proto_register(&sctpv6_prot, 1); 1031827bf122SSridhar Samudrala if (rc) 1032827bf122SSridhar Samudrala return rc; 1033827bf122SSridhar Samudrala 1034827bf122SSridhar Samudrala /* Add SCTPv6(UDP and TCP style) to inetsw6 linked list. */ 1035827bf122SSridhar Samudrala inet6_register_protosw(&sctpv6_seqpacket_protosw); 1036827bf122SSridhar Samudrala inet6_register_protosw(&sctpv6_stream_protosw); 1037827bf122SSridhar Samudrala 1038827bf122SSridhar Samudrala return 0; 1039827bf122SSridhar Samudrala } 1040827bf122SSridhar Samudrala 1041270637abSVlad Yasevich void sctp_v6_protosw_exit(void) 1042270637abSVlad Yasevich { 1043270637abSVlad Yasevich inet6_unregister_protosw(&sctpv6_seqpacket_protosw); 1044270637abSVlad Yasevich inet6_unregister_protosw(&sctpv6_stream_protosw); 1045270637abSVlad Yasevich proto_unregister(&sctpv6_prot); 1046270637abSVlad Yasevich } 1047270637abSVlad Yasevich 1048270637abSVlad Yasevich 1049827bf122SSridhar Samudrala /* Register with inet6 layer. */ 1050827bf122SSridhar Samudrala int sctp_v6_add_protocol(void) 1051827bf122SSridhar Samudrala { 10521da177e4SLinus Torvalds /* Register notifier for inet6 address additions/deletions. */ 10531da177e4SLinus Torvalds register_inet6addr_notifier(&sctp_inet6addr_notifier); 1054827bf122SSridhar Samudrala 1055827bf122SSridhar Samudrala if (inet6_add_protocol(&sctpv6_protocol, IPPROTO_SCTP) < 0) 1056827bf122SSridhar Samudrala return -EAGAIN; 1057827bf122SSridhar Samudrala 1058827bf122SSridhar Samudrala return 0; 10591da177e4SLinus Torvalds } 10601da177e4SLinus Torvalds 1061827bf122SSridhar Samudrala /* Unregister with inet6 layer. */ 1062827bf122SSridhar Samudrala void sctp_v6_del_protocol(void) 1063827bf122SSridhar Samudrala { 1064827bf122SSridhar Samudrala inet6_del_protocol(&sctpv6_protocol, IPPROTO_SCTP); 1065827bf122SSridhar Samudrala unregister_inet6addr_notifier(&sctp_inet6addr_notifier); 10661da177e4SLinus Torvalds } 1067