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0001 // SPDX-License-Identifier: GPL-2.0-or-later
0002 /* SCTP kernel implementation
0003  * (C) Copyright IBM Corp. 2002, 2004
0004  * Copyright (c) 2001 Nokia, Inc.
0005  * Copyright (c) 2001 La Monte H.P. Yarroll
0006  * Copyright (c) 2002-2003 Intel Corp.
0007  *
0008  * This file is part of the SCTP kernel implementation
0009  *
0010  * SCTP over IPv6.
0011  *
0012  * Please send any bug reports or fixes you make to the
0013  * email address(es):
0014  *    lksctp developers <linux-sctp@vger.kernel.org>
0015  *
0016  * Written or modified by:
0017  *    Le Yanqun         <yanqun.le@nokia.com>
0018  *    Hui Huang         <hui.huang@nokia.com>
0019  *    La Monte H.P. Yarroll <piggy@acm.org>
0020  *    Sridhar Samudrala     <sri@us.ibm.com>
0021  *    Jon Grimm         <jgrimm@us.ibm.com>
0022  *    Ardelle Fan       <ardelle.fan@intel.com>
0023  *
0024  * Based on:
0025  *  linux/net/ipv6/tcp_ipv6.c
0026  */
0027 
0028 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
0029 
0030 #include <linux/module.h>
0031 #include <linux/errno.h>
0032 #include <linux/types.h>
0033 #include <linux/socket.h>
0034 #include <linux/sockios.h>
0035 #include <linux/net.h>
0036 #include <linux/in.h>
0037 #include <linux/in6.h>
0038 #include <linux/netdevice.h>
0039 #include <linux/init.h>
0040 #include <linux/ipsec.h>
0041 #include <linux/slab.h>
0042 
0043 #include <linux/ipv6.h>
0044 #include <linux/icmpv6.h>
0045 #include <linux/random.h>
0046 #include <linux/seq_file.h>
0047 
0048 #include <net/protocol.h>
0049 #include <net/ndisc.h>
0050 #include <net/ip.h>
0051 #include <net/ipv6.h>
0052 #include <net/transp_v6.h>
0053 #include <net/addrconf.h>
0054 #include <net/ip6_route.h>
0055 #include <net/inet_common.h>
0056 #include <net/inet_ecn.h>
0057 #include <net/sctp/sctp.h>
0058 #include <net/udp_tunnel.h>
0059 
0060 #include <linux/uaccess.h>
0061 
0062 static inline int sctp_v6_addr_match_len(union sctp_addr *s1,
0063                      union sctp_addr *s2);
0064 static void sctp_v6_to_addr(union sctp_addr *addr, struct in6_addr *saddr,
0065                   __be16 port);
0066 static int sctp_v6_cmp_addr(const union sctp_addr *addr1,
0067                 const union sctp_addr *addr2);
0068 
0069 /* Event handler for inet6 address addition/deletion events.
0070  * The sctp_local_addr_list needs to be protocted by a spin lock since
0071  * multiple notifiers (say IPv4 and IPv6) may be running at the same
0072  * time and thus corrupt the list.
0073  * The reader side is protected with RCU.
0074  */
0075 static int sctp_inet6addr_event(struct notifier_block *this, unsigned long ev,
0076                 void *ptr)
0077 {
0078     struct inet6_ifaddr *ifa = (struct inet6_ifaddr *)ptr;
0079     struct sctp_sockaddr_entry *addr = NULL;
0080     struct sctp_sockaddr_entry *temp;
0081     struct net *net = dev_net(ifa->idev->dev);
0082     int found = 0;
0083 
0084     switch (ev) {
0085     case NETDEV_UP:
0086         addr = kzalloc(sizeof(*addr), GFP_ATOMIC);
0087         if (addr) {
0088             addr->a.v6.sin6_family = AF_INET6;
0089             addr->a.v6.sin6_addr = ifa->addr;
0090             addr->a.v6.sin6_scope_id = ifa->idev->dev->ifindex;
0091             addr->valid = 1;
0092             spin_lock_bh(&net->sctp.local_addr_lock);
0093             list_add_tail_rcu(&addr->list, &net->sctp.local_addr_list);
0094             sctp_addr_wq_mgmt(net, addr, SCTP_ADDR_NEW);
0095             spin_unlock_bh(&net->sctp.local_addr_lock);
0096         }
0097         break;
0098     case NETDEV_DOWN:
0099         spin_lock_bh(&net->sctp.local_addr_lock);
0100         list_for_each_entry_safe(addr, temp,
0101                     &net->sctp.local_addr_list, list) {
0102             if (addr->a.sa.sa_family == AF_INET6 &&
0103                 ipv6_addr_equal(&addr->a.v6.sin6_addr,
0104                         &ifa->addr) &&
0105                 addr->a.v6.sin6_scope_id == ifa->idev->dev->ifindex) {
0106                 sctp_addr_wq_mgmt(net, addr, SCTP_ADDR_DEL);
0107                 found = 1;
0108                 addr->valid = 0;
0109                 list_del_rcu(&addr->list);
0110                 break;
0111             }
0112         }
0113         spin_unlock_bh(&net->sctp.local_addr_lock);
0114         if (found)
0115             kfree_rcu(addr, rcu);
0116         break;
0117     }
0118 
0119     return NOTIFY_DONE;
0120 }
0121 
0122 static struct notifier_block sctp_inet6addr_notifier = {
0123     .notifier_call = sctp_inet6addr_event,
0124 };
0125 
0126 static void sctp_v6_err_handle(struct sctp_transport *t, struct sk_buff *skb,
0127                    __u8 type, __u8 code, __u32 info)
0128 {
0129     struct sctp_association *asoc = t->asoc;
0130     struct sock *sk = asoc->base.sk;
0131     struct ipv6_pinfo *np;
0132     int err = 0;
0133 
0134     switch (type) {
0135     case ICMPV6_PKT_TOOBIG:
0136         if (ip6_sk_accept_pmtu(sk))
0137             sctp_icmp_frag_needed(sk, asoc, t, info);
0138         return;
0139     case ICMPV6_PARAMPROB:
0140         if (ICMPV6_UNK_NEXTHDR == code) {
0141             sctp_icmp_proto_unreachable(sk, asoc, t);
0142             return;
0143         }
0144         break;
0145     case NDISC_REDIRECT:
0146         sctp_icmp_redirect(sk, t, skb);
0147         return;
0148     default:
0149         break;
0150     }
0151 
0152     np = inet6_sk(sk);
0153     icmpv6_err_convert(type, code, &err);
0154     if (!sock_owned_by_user(sk) && np->recverr) {
0155         sk->sk_err = err;
0156         sk_error_report(sk);
0157     } else {
0158         sk->sk_err_soft = err;
0159     }
0160 }
0161 
0162 /* ICMP error handler. */
0163 static int sctp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
0164                u8 type, u8 code, int offset, __be32 info)
0165 {
0166     struct net *net = dev_net(skb->dev);
0167     struct sctp_transport *transport;
0168     struct sctp_association *asoc;
0169     __u16 saveip, savesctp;
0170     struct sock *sk;
0171 
0172     /* Fix up skb to look at the embedded net header. */
0173     saveip   = skb->network_header;
0174     savesctp = skb->transport_header;
0175     skb_reset_network_header(skb);
0176     skb_set_transport_header(skb, offset);
0177     sk = sctp_err_lookup(net, AF_INET6, skb, sctp_hdr(skb), &asoc, &transport);
0178     /* Put back, the original pointers. */
0179     skb->network_header   = saveip;
0180     skb->transport_header = savesctp;
0181     if (!sk) {
0182         __ICMP6_INC_STATS(net, __in6_dev_get(skb->dev), ICMP6_MIB_INERRORS);
0183         return -ENOENT;
0184     }
0185 
0186     sctp_v6_err_handle(transport, skb, type, code, ntohl(info));
0187     sctp_err_finish(sk, transport);
0188 
0189     return 0;
0190 }
0191 
0192 int sctp_udp_v6_err(struct sock *sk, struct sk_buff *skb)
0193 {
0194     struct net *net = dev_net(skb->dev);
0195     struct sctp_association *asoc;
0196     struct sctp_transport *t;
0197     struct icmp6hdr *hdr;
0198     __u32 info = 0;
0199 
0200     skb->transport_header += sizeof(struct udphdr);
0201     sk = sctp_err_lookup(net, AF_INET6, skb, sctp_hdr(skb), &asoc, &t);
0202     if (!sk) {
0203         __ICMP6_INC_STATS(net, __in6_dev_get(skb->dev), ICMP6_MIB_INERRORS);
0204         return -ENOENT;
0205     }
0206 
0207     skb->transport_header -= sizeof(struct udphdr);
0208     hdr = (struct icmp6hdr *)(skb_network_header(skb) - sizeof(struct icmp6hdr));
0209     if (hdr->icmp6_type == NDISC_REDIRECT) {
0210         /* can't be handled without outer ip6hdr known, leave it to udpv6_err */
0211         sctp_err_finish(sk, t);
0212         return 0;
0213     }
0214     if (hdr->icmp6_type == ICMPV6_PKT_TOOBIG)
0215         info = ntohl(hdr->icmp6_mtu);
0216     sctp_v6_err_handle(t, skb, hdr->icmp6_type, hdr->icmp6_code, info);
0217 
0218     sctp_err_finish(sk, t);
0219     return 1;
0220 }
0221 
0222 static int sctp_v6_xmit(struct sk_buff *skb, struct sctp_transport *t)
0223 {
0224     struct dst_entry *dst = dst_clone(t->dst);
0225     struct flowi6 *fl6 = &t->fl.u.ip6;
0226     struct sock *sk = skb->sk;
0227     struct ipv6_pinfo *np = inet6_sk(sk);
0228     __u8 tclass = np->tclass;
0229     __be32 label;
0230 
0231     pr_debug("%s: skb:%p, len:%d, src:%pI6 dst:%pI6\n", __func__, skb,
0232          skb->len, &fl6->saddr, &fl6->daddr);
0233 
0234     if (t->dscp & SCTP_DSCP_SET_MASK)
0235         tclass = t->dscp & SCTP_DSCP_VAL_MASK;
0236 
0237     if (INET_ECN_is_capable(tclass))
0238         IP6_ECN_flow_xmit(sk, fl6->flowlabel);
0239 
0240     if (!(t->param_flags & SPP_PMTUD_ENABLE))
0241         skb->ignore_df = 1;
0242 
0243     SCTP_INC_STATS(sock_net(sk), SCTP_MIB_OUTSCTPPACKS);
0244 
0245     if (!t->encap_port || !sctp_sk(sk)->udp_port) {
0246         int res;
0247 
0248         skb_dst_set(skb, dst);
0249         rcu_read_lock();
0250         res = ip6_xmit(sk, skb, fl6, sk->sk_mark,
0251                    rcu_dereference(np->opt),
0252                    tclass, sk->sk_priority);
0253         rcu_read_unlock();
0254         return res;
0255     }
0256 
0257     if (skb_is_gso(skb))
0258         skb_shinfo(skb)->gso_type |= SKB_GSO_UDP_TUNNEL_CSUM;
0259 
0260     skb->encapsulation = 1;
0261     skb_reset_inner_mac_header(skb);
0262     skb_reset_inner_transport_header(skb);
0263     skb_set_inner_ipproto(skb, IPPROTO_SCTP);
0264     label = ip6_make_flowlabel(sock_net(sk), skb, fl6->flowlabel, true, fl6);
0265 
0266     return udp_tunnel6_xmit_skb(dst, sk, skb, NULL, &fl6->saddr,
0267                     &fl6->daddr, tclass, ip6_dst_hoplimit(dst),
0268                     label, sctp_sk(sk)->udp_port, t->encap_port, false);
0269 }
0270 
0271 /* Returns the dst cache entry for the given source and destination ip
0272  * addresses.
0273  */
0274 static void sctp_v6_get_dst(struct sctp_transport *t, union sctp_addr *saddr,
0275                 struct flowi *fl, struct sock *sk)
0276 {
0277     struct sctp_association *asoc = t->asoc;
0278     struct dst_entry *dst = NULL;
0279     struct flowi _fl;
0280     struct flowi6 *fl6 = &_fl.u.ip6;
0281     struct sctp_bind_addr *bp;
0282     struct ipv6_pinfo *np = inet6_sk(sk);
0283     struct sctp_sockaddr_entry *laddr;
0284     union sctp_addr *daddr = &t->ipaddr;
0285     union sctp_addr dst_saddr;
0286     struct in6_addr *final_p, final;
0287     enum sctp_scope scope;
0288     __u8 matchlen = 0;
0289 
0290     memset(&_fl, 0, sizeof(_fl));
0291     fl6->daddr = daddr->v6.sin6_addr;
0292     fl6->fl6_dport = daddr->v6.sin6_port;
0293     fl6->flowi6_proto = IPPROTO_SCTP;
0294     if (ipv6_addr_type(&daddr->v6.sin6_addr) & IPV6_ADDR_LINKLOCAL)
0295         fl6->flowi6_oif = daddr->v6.sin6_scope_id;
0296     else if (asoc)
0297         fl6->flowi6_oif = asoc->base.sk->sk_bound_dev_if;
0298     if (t->flowlabel & SCTP_FLOWLABEL_SET_MASK)
0299         fl6->flowlabel = htonl(t->flowlabel & SCTP_FLOWLABEL_VAL_MASK);
0300 
0301     if (np->sndflow && (fl6->flowlabel & IPV6_FLOWLABEL_MASK)) {
0302         struct ip6_flowlabel *flowlabel;
0303 
0304         flowlabel = fl6_sock_lookup(sk, fl6->flowlabel);
0305         if (IS_ERR(flowlabel))
0306             goto out;
0307         fl6_sock_release(flowlabel);
0308     }
0309 
0310     pr_debug("%s: dst=%pI6 ", __func__, &fl6->daddr);
0311 
0312     if (asoc)
0313         fl6->fl6_sport = htons(asoc->base.bind_addr.port);
0314 
0315     if (saddr) {
0316         fl6->saddr = saddr->v6.sin6_addr;
0317         if (!fl6->fl6_sport)
0318             fl6->fl6_sport = saddr->v6.sin6_port;
0319 
0320         pr_debug("src=%pI6 - ", &fl6->saddr);
0321     }
0322 
0323     rcu_read_lock();
0324     final_p = fl6_update_dst(fl6, rcu_dereference(np->opt), &final);
0325     rcu_read_unlock();
0326 
0327     dst = ip6_dst_lookup_flow(sock_net(sk), sk, fl6, final_p);
0328     if (!asoc || saddr) {
0329         t->dst = dst;
0330         memcpy(fl, &_fl, sizeof(_fl));
0331         goto out;
0332     }
0333 
0334     bp = &asoc->base.bind_addr;
0335     scope = sctp_scope(daddr);
0336     /* ip6_dst_lookup has filled in the fl6->saddr for us.  Check
0337      * to see if we can use it.
0338      */
0339     if (!IS_ERR(dst)) {
0340         /* Walk through the bind address list and look for a bind
0341          * address that matches the source address of the returned dst.
0342          */
0343         sctp_v6_to_addr(&dst_saddr, &fl6->saddr, htons(bp->port));
0344         rcu_read_lock();
0345         list_for_each_entry_rcu(laddr, &bp->address_list, list) {
0346             if (!laddr->valid || laddr->state == SCTP_ADDR_DEL ||
0347                 (laddr->state != SCTP_ADDR_SRC &&
0348                  !asoc->src_out_of_asoc_ok))
0349                 continue;
0350 
0351             /* Do not compare against v4 addrs */
0352             if ((laddr->a.sa.sa_family == AF_INET6) &&
0353                 (sctp_v6_cmp_addr(&dst_saddr, &laddr->a))) {
0354                 rcu_read_unlock();
0355                 t->dst = dst;
0356                 memcpy(fl, &_fl, sizeof(_fl));
0357                 goto out;
0358             }
0359         }
0360         rcu_read_unlock();
0361         /* None of the bound addresses match the source address of the
0362          * dst. So release it.
0363          */
0364         dst_release(dst);
0365         dst = NULL;
0366     }
0367 
0368     /* Walk through the bind address list and try to get the
0369      * best source address for a given destination.
0370      */
0371     rcu_read_lock();
0372     list_for_each_entry_rcu(laddr, &bp->address_list, list) {
0373         struct dst_entry *bdst;
0374         __u8 bmatchlen;
0375 
0376         if (!laddr->valid ||
0377             laddr->state != SCTP_ADDR_SRC ||
0378             laddr->a.sa.sa_family != AF_INET6 ||
0379             scope > sctp_scope(&laddr->a))
0380             continue;
0381 
0382         fl6->saddr = laddr->a.v6.sin6_addr;
0383         fl6->fl6_sport = laddr->a.v6.sin6_port;
0384         final_p = fl6_update_dst(fl6, rcu_dereference(np->opt), &final);
0385         bdst = ip6_dst_lookup_flow(sock_net(sk), sk, fl6, final_p);
0386 
0387         if (IS_ERR(bdst))
0388             continue;
0389 
0390         if (ipv6_chk_addr(dev_net(bdst->dev),
0391                   &laddr->a.v6.sin6_addr, bdst->dev, 1)) {
0392             if (!IS_ERR_OR_NULL(dst))
0393                 dst_release(dst);
0394             dst = bdst;
0395             t->dst = dst;
0396             memcpy(fl, &_fl, sizeof(_fl));
0397             break;
0398         }
0399 
0400         bmatchlen = sctp_v6_addr_match_len(daddr, &laddr->a);
0401         if (matchlen > bmatchlen) {
0402             dst_release(bdst);
0403             continue;
0404         }
0405 
0406         if (!IS_ERR_OR_NULL(dst))
0407             dst_release(dst);
0408         dst = bdst;
0409         matchlen = bmatchlen;
0410         t->dst = dst;
0411         memcpy(fl, &_fl, sizeof(_fl));
0412     }
0413     rcu_read_unlock();
0414 
0415 out:
0416     if (!IS_ERR_OR_NULL(dst)) {
0417         struct rt6_info *rt;
0418 
0419         rt = (struct rt6_info *)dst;
0420         t->dst_cookie = rt6_get_cookie(rt);
0421         pr_debug("rt6_dst:%pI6/%d rt6_src:%pI6\n",
0422              &rt->rt6i_dst.addr, rt->rt6i_dst.plen,
0423              &fl->u.ip6.saddr);
0424     } else {
0425         t->dst = NULL;
0426         pr_debug("no route\n");
0427     }
0428 }
0429 
0430 /* Returns the number of consecutive initial bits that match in the 2 ipv6
0431  * addresses.
0432  */
0433 static inline int sctp_v6_addr_match_len(union sctp_addr *s1,
0434                      union sctp_addr *s2)
0435 {
0436     return ipv6_addr_diff(&s1->v6.sin6_addr, &s2->v6.sin6_addr);
0437 }
0438 
0439 /* Fills in the source address(saddr) based on the destination address(daddr)
0440  * and asoc's bind address list.
0441  */
0442 static void sctp_v6_get_saddr(struct sctp_sock *sk,
0443                   struct sctp_transport *t,
0444                   struct flowi *fl)
0445 {
0446     struct flowi6 *fl6 = &fl->u.ip6;
0447     union sctp_addr *saddr = &t->saddr;
0448 
0449     pr_debug("%s: asoc:%p dst:%p\n", __func__, t->asoc, t->dst);
0450 
0451     if (t->dst) {
0452         saddr->v6.sin6_family = AF_INET6;
0453         saddr->v6.sin6_addr = fl6->saddr;
0454     }
0455 }
0456 
0457 /* Make a copy of all potential local addresses. */
0458 static void sctp_v6_copy_addrlist(struct list_head *addrlist,
0459                   struct net_device *dev)
0460 {
0461     struct inet6_dev *in6_dev;
0462     struct inet6_ifaddr *ifp;
0463     struct sctp_sockaddr_entry *addr;
0464 
0465     rcu_read_lock();
0466     if ((in6_dev = __in6_dev_get(dev)) == NULL) {
0467         rcu_read_unlock();
0468         return;
0469     }
0470 
0471     read_lock_bh(&in6_dev->lock);
0472     list_for_each_entry(ifp, &in6_dev->addr_list, if_list) {
0473         /* Add the address to the local list.  */
0474         addr = kzalloc(sizeof(*addr), GFP_ATOMIC);
0475         if (addr) {
0476             addr->a.v6.sin6_family = AF_INET6;
0477             addr->a.v6.sin6_addr = ifp->addr;
0478             addr->a.v6.sin6_scope_id = dev->ifindex;
0479             addr->valid = 1;
0480             INIT_LIST_HEAD(&addr->list);
0481             list_add_tail(&addr->list, addrlist);
0482         }
0483     }
0484 
0485     read_unlock_bh(&in6_dev->lock);
0486     rcu_read_unlock();
0487 }
0488 
0489 /* Copy over any ip options */
0490 static void sctp_v6_copy_ip_options(struct sock *sk, struct sock *newsk)
0491 {
0492     struct ipv6_pinfo *newnp, *np = inet6_sk(sk);
0493     struct ipv6_txoptions *opt;
0494 
0495     newnp = inet6_sk(newsk);
0496 
0497     rcu_read_lock();
0498     opt = rcu_dereference(np->opt);
0499     if (opt) {
0500         opt = ipv6_dup_options(newsk, opt);
0501         if (!opt)
0502             pr_err("%s: Failed to copy ip options\n", __func__);
0503     }
0504     RCU_INIT_POINTER(newnp->opt, opt);
0505     rcu_read_unlock();
0506 }
0507 
0508 /* Account for the IP options */
0509 static int sctp_v6_ip_options_len(struct sock *sk)
0510 {
0511     struct ipv6_pinfo *np = inet6_sk(sk);
0512     struct ipv6_txoptions *opt;
0513     int len = 0;
0514 
0515     rcu_read_lock();
0516     opt = rcu_dereference(np->opt);
0517     if (opt)
0518         len = opt->opt_flen + opt->opt_nflen;
0519 
0520     rcu_read_unlock();
0521     return len;
0522 }
0523 
0524 /* Initialize a sockaddr_storage from in incoming skb. */
0525 static void sctp_v6_from_skb(union sctp_addr *addr, struct sk_buff *skb,
0526                  int is_saddr)
0527 {
0528     /* Always called on head skb, so this is safe */
0529     struct sctphdr *sh = sctp_hdr(skb);
0530     struct sockaddr_in6 *sa = &addr->v6;
0531 
0532     addr->v6.sin6_family = AF_INET6;
0533     addr->v6.sin6_flowinfo = 0; /* FIXME */
0534     addr->v6.sin6_scope_id = ((struct inet6_skb_parm *)skb->cb)->iif;
0535 
0536     if (is_saddr) {
0537         sa->sin6_port = sh->source;
0538         sa->sin6_addr = ipv6_hdr(skb)->saddr;
0539     } else {
0540         sa->sin6_port = sh->dest;
0541         sa->sin6_addr = ipv6_hdr(skb)->daddr;
0542     }
0543 }
0544 
0545 /* Initialize an sctp_addr from a socket. */
0546 static void sctp_v6_from_sk(union sctp_addr *addr, struct sock *sk)
0547 {
0548     addr->v6.sin6_family = AF_INET6;
0549     addr->v6.sin6_port = 0;
0550     addr->v6.sin6_addr = sk->sk_v6_rcv_saddr;
0551 }
0552 
0553 /* Initialize sk->sk_rcv_saddr from sctp_addr. */
0554 static void sctp_v6_to_sk_saddr(union sctp_addr *addr, struct sock *sk)
0555 {
0556     if (addr->sa.sa_family == AF_INET) {
0557         sk->sk_v6_rcv_saddr.s6_addr32[0] = 0;
0558         sk->sk_v6_rcv_saddr.s6_addr32[1] = 0;
0559         sk->sk_v6_rcv_saddr.s6_addr32[2] = htonl(0x0000ffff);
0560         sk->sk_v6_rcv_saddr.s6_addr32[3] =
0561             addr->v4.sin_addr.s_addr;
0562     } else {
0563         sk->sk_v6_rcv_saddr = addr->v6.sin6_addr;
0564     }
0565 }
0566 
0567 /* Initialize sk->sk_daddr from sctp_addr. */
0568 static void sctp_v6_to_sk_daddr(union sctp_addr *addr, struct sock *sk)
0569 {
0570     if (addr->sa.sa_family == AF_INET) {
0571         sk->sk_v6_daddr.s6_addr32[0] = 0;
0572         sk->sk_v6_daddr.s6_addr32[1] = 0;
0573         sk->sk_v6_daddr.s6_addr32[2] = htonl(0x0000ffff);
0574         sk->sk_v6_daddr.s6_addr32[3] = addr->v4.sin_addr.s_addr;
0575     } else {
0576         sk->sk_v6_daddr = addr->v6.sin6_addr;
0577     }
0578 }
0579 
0580 /* Initialize a sctp_addr from an address parameter. */
0581 static bool sctp_v6_from_addr_param(union sctp_addr *addr,
0582                     union sctp_addr_param *param,
0583                     __be16 port, int iif)
0584 {
0585     if (ntohs(param->v6.param_hdr.length) < sizeof(struct sctp_ipv6addr_param))
0586         return false;
0587 
0588     addr->v6.sin6_family = AF_INET6;
0589     addr->v6.sin6_port = port;
0590     addr->v6.sin6_flowinfo = 0; /* BUG */
0591     addr->v6.sin6_addr = param->v6.addr;
0592     addr->v6.sin6_scope_id = iif;
0593 
0594     return true;
0595 }
0596 
0597 /* Initialize an address parameter from a sctp_addr and return the length
0598  * of the address parameter.
0599  */
0600 static int sctp_v6_to_addr_param(const union sctp_addr *addr,
0601                  union sctp_addr_param *param)
0602 {
0603     int length = sizeof(struct sctp_ipv6addr_param);
0604 
0605     param->v6.param_hdr.type = SCTP_PARAM_IPV6_ADDRESS;
0606     param->v6.param_hdr.length = htons(length);
0607     param->v6.addr = addr->v6.sin6_addr;
0608 
0609     return length;
0610 }
0611 
0612 /* Initialize a sctp_addr from struct in6_addr. */
0613 static void sctp_v6_to_addr(union sctp_addr *addr, struct in6_addr *saddr,
0614                   __be16 port)
0615 {
0616     addr->sa.sa_family = AF_INET6;
0617     addr->v6.sin6_port = port;
0618     addr->v6.sin6_flowinfo = 0;
0619     addr->v6.sin6_addr = *saddr;
0620     addr->v6.sin6_scope_id = 0;
0621 }
0622 
0623 static int __sctp_v6_cmp_addr(const union sctp_addr *addr1,
0624                   const union sctp_addr *addr2)
0625 {
0626     if (addr1->sa.sa_family != addr2->sa.sa_family) {
0627         if (addr1->sa.sa_family == AF_INET &&
0628             addr2->sa.sa_family == AF_INET6 &&
0629             ipv6_addr_v4mapped(&addr2->v6.sin6_addr) &&
0630             addr2->v6.sin6_addr.s6_addr32[3] ==
0631             addr1->v4.sin_addr.s_addr)
0632             return 1;
0633 
0634         if (addr2->sa.sa_family == AF_INET &&
0635             addr1->sa.sa_family == AF_INET6 &&
0636             ipv6_addr_v4mapped(&addr1->v6.sin6_addr) &&
0637             addr1->v6.sin6_addr.s6_addr32[3] ==
0638             addr2->v4.sin_addr.s_addr)
0639             return 1;
0640 
0641         return 0;
0642     }
0643 
0644     if (!ipv6_addr_equal(&addr1->v6.sin6_addr, &addr2->v6.sin6_addr))
0645         return 0;
0646 
0647     /* If this is a linklocal address, compare the scope_id. */
0648     if ((ipv6_addr_type(&addr1->v6.sin6_addr) & IPV6_ADDR_LINKLOCAL) &&
0649         addr1->v6.sin6_scope_id && addr2->v6.sin6_scope_id &&
0650         addr1->v6.sin6_scope_id != addr2->v6.sin6_scope_id)
0651         return 0;
0652 
0653     return 1;
0654 }
0655 
0656 /* Compare addresses exactly.
0657  * v4-mapped-v6 is also in consideration.
0658  */
0659 static int sctp_v6_cmp_addr(const union sctp_addr *addr1,
0660                 const union sctp_addr *addr2)
0661 {
0662     return __sctp_v6_cmp_addr(addr1, addr2) &&
0663            addr1->v6.sin6_port == addr2->v6.sin6_port;
0664 }
0665 
0666 /* Initialize addr struct to INADDR_ANY. */
0667 static void sctp_v6_inaddr_any(union sctp_addr *addr, __be16 port)
0668 {
0669     memset(addr, 0x00, sizeof(union sctp_addr));
0670     addr->v6.sin6_family = AF_INET6;
0671     addr->v6.sin6_port = port;
0672 }
0673 
0674 /* Is this a wildcard address? */
0675 static int sctp_v6_is_any(const union sctp_addr *addr)
0676 {
0677     return ipv6_addr_any(&addr->v6.sin6_addr);
0678 }
0679 
0680 /* Should this be available for binding?   */
0681 static int sctp_v6_available(union sctp_addr *addr, struct sctp_sock *sp)
0682 {
0683     int type;
0684     struct net *net = sock_net(&sp->inet.sk);
0685     const struct in6_addr *in6 = (const struct in6_addr *)&addr->v6.sin6_addr;
0686 
0687     type = ipv6_addr_type(in6);
0688     if (IPV6_ADDR_ANY == type)
0689         return 1;
0690     if (type == IPV6_ADDR_MAPPED) {
0691         if (sp && ipv6_only_sock(sctp_opt2sk(sp)))
0692             return 0;
0693         sctp_v6_map_v4(addr);
0694         return sctp_get_af_specific(AF_INET)->available(addr, sp);
0695     }
0696     if (!(type & IPV6_ADDR_UNICAST))
0697         return 0;
0698 
0699     return ipv6_can_nonlocal_bind(net, &sp->inet) ||
0700            ipv6_chk_addr(net, in6, NULL, 0);
0701 }
0702 
0703 /* This function checks if the address is a valid address to be used for
0704  * SCTP.
0705  *
0706  * Output:
0707  * Return 0 - If the address is a non-unicast or an illegal address.
0708  * Return 1 - If the address is a unicast.
0709  */
0710 static int sctp_v6_addr_valid(union sctp_addr *addr,
0711                   struct sctp_sock *sp,
0712                   const struct sk_buff *skb)
0713 {
0714     int ret = ipv6_addr_type(&addr->v6.sin6_addr);
0715 
0716     /* Support v4-mapped-v6 address. */
0717     if (ret == IPV6_ADDR_MAPPED) {
0718         /* Note: This routine is used in input, so v4-mapped-v6
0719          * are disallowed here when there is no sctp_sock.
0720          */
0721         if (sp && ipv6_only_sock(sctp_opt2sk(sp)))
0722             return 0;
0723         sctp_v6_map_v4(addr);
0724         return sctp_get_af_specific(AF_INET)->addr_valid(addr, sp, skb);
0725     }
0726 
0727     /* Is this a non-unicast address */
0728     if (!(ret & IPV6_ADDR_UNICAST))
0729         return 0;
0730 
0731     return 1;
0732 }
0733 
0734 /* What is the scope of 'addr'?  */
0735 static enum sctp_scope sctp_v6_scope(union sctp_addr *addr)
0736 {
0737     enum sctp_scope retval;
0738     int v6scope;
0739 
0740     /* The IPv6 scope is really a set of bit fields.
0741      * See IFA_* in <net/if_inet6.h>.  Map to a generic SCTP scope.
0742      */
0743 
0744     v6scope = ipv6_addr_scope(&addr->v6.sin6_addr);
0745     switch (v6scope) {
0746     case IFA_HOST:
0747         retval = SCTP_SCOPE_LOOPBACK;
0748         break;
0749     case IFA_LINK:
0750         retval = SCTP_SCOPE_LINK;
0751         break;
0752     case IFA_SITE:
0753         retval = SCTP_SCOPE_PRIVATE;
0754         break;
0755     default:
0756         retval = SCTP_SCOPE_GLOBAL;
0757         break;
0758     }
0759 
0760     return retval;
0761 }
0762 
0763 /* Create and initialize a new sk for the socket to be returned by accept(). */
0764 static struct sock *sctp_v6_create_accept_sk(struct sock *sk,
0765                          struct sctp_association *asoc,
0766                          bool kern)
0767 {
0768     struct sock *newsk;
0769     struct ipv6_pinfo *newnp, *np = inet6_sk(sk);
0770     struct sctp6_sock *newsctp6sk;
0771 
0772     newsk = sk_alloc(sock_net(sk), PF_INET6, GFP_KERNEL, sk->sk_prot, kern);
0773     if (!newsk)
0774         goto out;
0775 
0776     sock_init_data(NULL, newsk);
0777 
0778     sctp_copy_sock(newsk, sk, asoc);
0779     sock_reset_flag(sk, SOCK_ZAPPED);
0780 
0781     newsctp6sk = (struct sctp6_sock *)newsk;
0782     inet_sk(newsk)->pinet6 = &newsctp6sk->inet6;
0783 
0784     sctp_sk(newsk)->v4mapped = sctp_sk(sk)->v4mapped;
0785 
0786     newnp = inet6_sk(newsk);
0787 
0788     memcpy(newnp, np, sizeof(struct ipv6_pinfo));
0789     newnp->ipv6_mc_list = NULL;
0790     newnp->ipv6_ac_list = NULL;
0791     newnp->ipv6_fl_list = NULL;
0792 
0793     sctp_v6_copy_ip_options(sk, newsk);
0794 
0795     /* Initialize sk's sport, dport, rcv_saddr and daddr for getsockname()
0796      * and getpeername().
0797      */
0798     sctp_v6_to_sk_daddr(&asoc->peer.primary_addr, newsk);
0799 
0800     newsk->sk_v6_rcv_saddr = sk->sk_v6_rcv_saddr;
0801 
0802     sk_refcnt_debug_inc(newsk);
0803 
0804     if (newsk->sk_prot->init(newsk)) {
0805         sk_common_release(newsk);
0806         newsk = NULL;
0807     }
0808 
0809 out:
0810     return newsk;
0811 }
0812 
0813 /* Format a sockaddr for return to user space. This makes sure the return is
0814  * AF_INET or AF_INET6 depending on the SCTP_I_WANT_MAPPED_V4_ADDR option.
0815  */
0816 static int sctp_v6_addr_to_user(struct sctp_sock *sp, union sctp_addr *addr)
0817 {
0818     if (sp->v4mapped) {
0819         if (addr->sa.sa_family == AF_INET)
0820             sctp_v4_map_v6(addr);
0821     } else {
0822         if (addr->sa.sa_family == AF_INET6 &&
0823             ipv6_addr_v4mapped(&addr->v6.sin6_addr))
0824             sctp_v6_map_v4(addr);
0825     }
0826 
0827     if (addr->sa.sa_family == AF_INET) {
0828         memset(addr->v4.sin_zero, 0, sizeof(addr->v4.sin_zero));
0829         return sizeof(struct sockaddr_in);
0830     }
0831     return sizeof(struct sockaddr_in6);
0832 }
0833 
0834 /* Where did this skb come from?  */
0835 static int sctp_v6_skb_iif(const struct sk_buff *skb)
0836 {
0837     return IP6CB(skb)->iif;
0838 }
0839 
0840 /* Was this packet marked by Explicit Congestion Notification? */
0841 static int sctp_v6_is_ce(const struct sk_buff *skb)
0842 {
0843     return *((__u32 *)(ipv6_hdr(skb))) & (__force __u32)htonl(1 << 20);
0844 }
0845 
0846 /* Dump the v6 addr to the seq file. */
0847 static void sctp_v6_seq_dump_addr(struct seq_file *seq, union sctp_addr *addr)
0848 {
0849     seq_printf(seq, "%pI6 ", &addr->v6.sin6_addr);
0850 }
0851 
0852 static void sctp_v6_ecn_capable(struct sock *sk)
0853 {
0854     inet6_sk(sk)->tclass |= INET_ECN_ECT_0;
0855 }
0856 
0857 /* Initialize a PF_INET msgname from a ulpevent. */
0858 static void sctp_inet6_event_msgname(struct sctp_ulpevent *event,
0859                      char *msgname, int *addrlen)
0860 {
0861     union sctp_addr *addr;
0862     struct sctp_association *asoc;
0863     union sctp_addr *paddr;
0864 
0865     if (!msgname)
0866         return;
0867 
0868     addr = (union sctp_addr *)msgname;
0869     asoc = event->asoc;
0870     paddr = &asoc->peer.primary_addr;
0871 
0872     if (paddr->sa.sa_family == AF_INET) {
0873         addr->v4.sin_family = AF_INET;
0874         addr->v4.sin_port = htons(asoc->peer.port);
0875         addr->v4.sin_addr = paddr->v4.sin_addr;
0876     } else {
0877         addr->v6.sin6_family = AF_INET6;
0878         addr->v6.sin6_flowinfo = 0;
0879         if (ipv6_addr_type(&paddr->v6.sin6_addr) & IPV6_ADDR_LINKLOCAL)
0880             addr->v6.sin6_scope_id = paddr->v6.sin6_scope_id;
0881         else
0882             addr->v6.sin6_scope_id = 0;
0883         addr->v6.sin6_port = htons(asoc->peer.port);
0884         addr->v6.sin6_addr = paddr->v6.sin6_addr;
0885     }
0886 
0887     *addrlen = sctp_v6_addr_to_user(sctp_sk(asoc->base.sk), addr);
0888 }
0889 
0890 /* Initialize a msg_name from an inbound skb. */
0891 static void sctp_inet6_skb_msgname(struct sk_buff *skb, char *msgname,
0892                    int *addr_len)
0893 {
0894     union sctp_addr *addr;
0895     struct sctphdr *sh;
0896 
0897     if (!msgname)
0898         return;
0899 
0900     addr = (union sctp_addr *)msgname;
0901     sh = sctp_hdr(skb);
0902 
0903     if (ip_hdr(skb)->version == 4) {
0904         addr->v4.sin_family = AF_INET;
0905         addr->v4.sin_port = sh->source;
0906         addr->v4.sin_addr.s_addr = ip_hdr(skb)->saddr;
0907     } else {
0908         addr->v6.sin6_family = AF_INET6;
0909         addr->v6.sin6_flowinfo = 0;
0910         addr->v6.sin6_port = sh->source;
0911         addr->v6.sin6_addr = ipv6_hdr(skb)->saddr;
0912         if (ipv6_addr_type(&addr->v6.sin6_addr) & IPV6_ADDR_LINKLOCAL)
0913             addr->v6.sin6_scope_id = sctp_v6_skb_iif(skb);
0914         else
0915             addr->v6.sin6_scope_id = 0;
0916     }
0917 
0918     *addr_len = sctp_v6_addr_to_user(sctp_sk(skb->sk), addr);
0919 }
0920 
0921 /* Do we support this AF? */
0922 static int sctp_inet6_af_supported(sa_family_t family, struct sctp_sock *sp)
0923 {
0924     switch (family) {
0925     case AF_INET6:
0926         return 1;
0927     /* v4-mapped-v6 addresses */
0928     case AF_INET:
0929         if (!ipv6_only_sock(sctp_opt2sk(sp)))
0930             return 1;
0931         fallthrough;
0932     default:
0933         return 0;
0934     }
0935 }
0936 
0937 /* Address matching with wildcards allowed.  This extra level
0938  * of indirection lets us choose whether a PF_INET6 should
0939  * disallow any v4 addresses if we so choose.
0940  */
0941 static int sctp_inet6_cmp_addr(const union sctp_addr *addr1,
0942                    const union sctp_addr *addr2,
0943                    struct sctp_sock *opt)
0944 {
0945     struct sock *sk = sctp_opt2sk(opt);
0946     struct sctp_af *af1, *af2;
0947 
0948     af1 = sctp_get_af_specific(addr1->sa.sa_family);
0949     af2 = sctp_get_af_specific(addr2->sa.sa_family);
0950 
0951     if (!af1 || !af2)
0952         return 0;
0953 
0954     /* If the socket is IPv6 only, v4 addrs will not match */
0955     if (ipv6_only_sock(sk) && af1 != af2)
0956         return 0;
0957 
0958     /* Today, wildcard AF_INET/AF_INET6. */
0959     if (sctp_is_any(sk, addr1) || sctp_is_any(sk, addr2))
0960         return 1;
0961 
0962     if (addr1->sa.sa_family == AF_INET && addr2->sa.sa_family == AF_INET)
0963         return addr1->v4.sin_addr.s_addr == addr2->v4.sin_addr.s_addr;
0964 
0965     return __sctp_v6_cmp_addr(addr1, addr2);
0966 }
0967 
0968 /* Verify that the provided sockaddr looks bindable.   Common verification,
0969  * has already been taken care of.
0970  */
0971 static int sctp_inet6_bind_verify(struct sctp_sock *opt, union sctp_addr *addr)
0972 {
0973     struct sctp_af *af;
0974 
0975     /* ASSERT: address family has already been verified. */
0976     if (addr->sa.sa_family != AF_INET6)
0977         af = sctp_get_af_specific(addr->sa.sa_family);
0978     else {
0979         int type = ipv6_addr_type(&addr->v6.sin6_addr);
0980         struct net_device *dev;
0981 
0982         if (type & IPV6_ADDR_LINKLOCAL) {
0983             struct net *net;
0984             if (!addr->v6.sin6_scope_id)
0985                 return 0;
0986             net = sock_net(&opt->inet.sk);
0987             rcu_read_lock();
0988             dev = dev_get_by_index_rcu(net, addr->v6.sin6_scope_id);
0989             if (!dev || !(ipv6_can_nonlocal_bind(net, &opt->inet) ||
0990                       ipv6_chk_addr(net, &addr->v6.sin6_addr,
0991                             dev, 0))) {
0992                 rcu_read_unlock();
0993                 return 0;
0994             }
0995             rcu_read_unlock();
0996         }
0997 
0998         af = opt->pf->af;
0999     }
1000     return af->available(addr, opt);
1001 }
1002 
1003 /* Verify that the provided sockaddr looks sendable.   Common verification,
1004  * has already been taken care of.
1005  */
1006 static int sctp_inet6_send_verify(struct sctp_sock *opt, union sctp_addr *addr)
1007 {
1008     struct sctp_af *af = NULL;
1009 
1010     /* ASSERT: address family has already been verified. */
1011     if (addr->sa.sa_family != AF_INET6)
1012         af = sctp_get_af_specific(addr->sa.sa_family);
1013     else {
1014         int type = ipv6_addr_type(&addr->v6.sin6_addr);
1015         struct net_device *dev;
1016 
1017         if (type & IPV6_ADDR_LINKLOCAL) {
1018             if (!addr->v6.sin6_scope_id)
1019                 return 0;
1020             rcu_read_lock();
1021             dev = dev_get_by_index_rcu(sock_net(&opt->inet.sk),
1022                            addr->v6.sin6_scope_id);
1023             rcu_read_unlock();
1024             if (!dev)
1025                 return 0;
1026         }
1027         af = opt->pf->af;
1028     }
1029 
1030     return af != NULL;
1031 }
1032 
1033 /* Fill in Supported Address Type information for INIT and INIT-ACK
1034  * chunks.   Note: In the future, we may want to look at sock options
1035  * to determine whether a PF_INET6 socket really wants to have IPV4
1036  * addresses.
1037  * Returns number of addresses supported.
1038  */
1039 static int sctp_inet6_supported_addrs(const struct sctp_sock *opt,
1040                       __be16 *types)
1041 {
1042     types[0] = SCTP_PARAM_IPV6_ADDRESS;
1043     if (!opt || !ipv6_only_sock(sctp_opt2sk(opt))) {
1044         types[1] = SCTP_PARAM_IPV4_ADDRESS;
1045         return 2;
1046     }
1047     return 1;
1048 }
1049 
1050 /* Handle SCTP_I_WANT_MAPPED_V4_ADDR for getpeername() and getsockname() */
1051 static int sctp_getname(struct socket *sock, struct sockaddr *uaddr,
1052             int peer)
1053 {
1054     int rc;
1055 
1056     rc = inet6_getname(sock, uaddr, peer);
1057 
1058     if (rc < 0)
1059         return rc;
1060 
1061     rc = sctp_v6_addr_to_user(sctp_sk(sock->sk),
1062                       (union sctp_addr *)uaddr);
1063 
1064     return rc;
1065 }
1066 
1067 static const struct proto_ops inet6_seqpacket_ops = {
1068     .family        = PF_INET6,
1069     .owner         = THIS_MODULE,
1070     .release       = inet6_release,
1071     .bind          = inet6_bind,
1072     .connect       = sctp_inet_connect,
1073     .socketpair    = sock_no_socketpair,
1074     .accept        = inet_accept,
1075     .getname       = sctp_getname,
1076     .poll          = sctp_poll,
1077     .ioctl         = inet6_ioctl,
1078     .gettstamp     = sock_gettstamp,
1079     .listen        = sctp_inet_listen,
1080     .shutdown      = inet_shutdown,
1081     .setsockopt    = sock_common_setsockopt,
1082     .getsockopt    = sock_common_getsockopt,
1083     .sendmsg       = inet_sendmsg,
1084     .recvmsg       = inet_recvmsg,
1085     .mmap          = sock_no_mmap,
1086 #ifdef CONFIG_COMPAT
1087     .compat_ioctl      = inet6_compat_ioctl,
1088 #endif
1089 };
1090 
1091 static struct inet_protosw sctpv6_seqpacket_protosw = {
1092     .type          = SOCK_SEQPACKET,
1093     .protocol      = IPPROTO_SCTP,
1094     .prot          = &sctpv6_prot,
1095     .ops           = &inet6_seqpacket_ops,
1096     .flags         = SCTP_PROTOSW_FLAG
1097 };
1098 static struct inet_protosw sctpv6_stream_protosw = {
1099     .type          = SOCK_STREAM,
1100     .protocol      = IPPROTO_SCTP,
1101     .prot          = &sctpv6_prot,
1102     .ops           = &inet6_seqpacket_ops,
1103     .flags         = SCTP_PROTOSW_FLAG,
1104 };
1105 
1106 static int sctp6_rcv(struct sk_buff *skb)
1107 {
1108     SCTP_INPUT_CB(skb)->encap_port = 0;
1109     return sctp_rcv(skb) ? -1 : 0;
1110 }
1111 
1112 static const struct inet6_protocol sctpv6_protocol = {
1113     .handler      = sctp6_rcv,
1114     .err_handler  = sctp_v6_err,
1115     .flags        = INET6_PROTO_NOPOLICY | INET6_PROTO_FINAL,
1116 };
1117 
1118 static struct sctp_af sctp_af_inet6 = {
1119     .sa_family     = AF_INET6,
1120     .sctp_xmit     = sctp_v6_xmit,
1121     .setsockopt    = ipv6_setsockopt,
1122     .getsockopt    = ipv6_getsockopt,
1123     .get_dst       = sctp_v6_get_dst,
1124     .get_saddr     = sctp_v6_get_saddr,
1125     .copy_addrlist     = sctp_v6_copy_addrlist,
1126     .from_skb      = sctp_v6_from_skb,
1127     .from_sk       = sctp_v6_from_sk,
1128     .from_addr_param   = sctp_v6_from_addr_param,
1129     .to_addr_param     = sctp_v6_to_addr_param,
1130     .cmp_addr      = sctp_v6_cmp_addr,
1131     .scope         = sctp_v6_scope,
1132     .addr_valid    = sctp_v6_addr_valid,
1133     .inaddr_any    = sctp_v6_inaddr_any,
1134     .is_any        = sctp_v6_is_any,
1135     .available     = sctp_v6_available,
1136     .skb_iif       = sctp_v6_skb_iif,
1137     .is_ce         = sctp_v6_is_ce,
1138     .seq_dump_addr     = sctp_v6_seq_dump_addr,
1139     .ecn_capable       = sctp_v6_ecn_capable,
1140     .net_header_len    = sizeof(struct ipv6hdr),
1141     .sockaddr_len      = sizeof(struct sockaddr_in6),
1142     .ip_options_len    = sctp_v6_ip_options_len,
1143 };
1144 
1145 static struct sctp_pf sctp_pf_inet6 = {
1146     .event_msgname = sctp_inet6_event_msgname,
1147     .skb_msgname   = sctp_inet6_skb_msgname,
1148     .af_supported  = sctp_inet6_af_supported,
1149     .cmp_addr      = sctp_inet6_cmp_addr,
1150     .bind_verify   = sctp_inet6_bind_verify,
1151     .send_verify   = sctp_inet6_send_verify,
1152     .supported_addrs = sctp_inet6_supported_addrs,
1153     .create_accept_sk = sctp_v6_create_accept_sk,
1154     .addr_to_user  = sctp_v6_addr_to_user,
1155     .to_sk_saddr   = sctp_v6_to_sk_saddr,
1156     .to_sk_daddr   = sctp_v6_to_sk_daddr,
1157     .copy_ip_options = sctp_v6_copy_ip_options,
1158     .af            = &sctp_af_inet6,
1159 };
1160 
1161 /* Initialize IPv6 support and register with socket layer.  */
1162 void sctp_v6_pf_init(void)
1163 {
1164     /* Register the SCTP specific PF_INET6 functions. */
1165     sctp_register_pf(&sctp_pf_inet6, PF_INET6);
1166 
1167     /* Register the SCTP specific AF_INET6 functions. */
1168     sctp_register_af(&sctp_af_inet6);
1169 }
1170 
1171 void sctp_v6_pf_exit(void)
1172 {
1173     list_del(&sctp_af_inet6.list);
1174 }
1175 
1176 /* Initialize IPv6 support and register with socket layer.  */
1177 int sctp_v6_protosw_init(void)
1178 {
1179     int rc;
1180 
1181     rc = proto_register(&sctpv6_prot, 1);
1182     if (rc)
1183         return rc;
1184 
1185     /* Add SCTPv6(UDP and TCP style) to inetsw6 linked list. */
1186     inet6_register_protosw(&sctpv6_seqpacket_protosw);
1187     inet6_register_protosw(&sctpv6_stream_protosw);
1188 
1189     return 0;
1190 }
1191 
1192 void sctp_v6_protosw_exit(void)
1193 {
1194     inet6_unregister_protosw(&sctpv6_seqpacket_protosw);
1195     inet6_unregister_protosw(&sctpv6_stream_protosw);
1196     proto_unregister(&sctpv6_prot);
1197 }
1198 
1199 
1200 /* Register with inet6 layer. */
1201 int sctp_v6_add_protocol(void)
1202 {
1203     /* Register notifier for inet6 address additions/deletions. */
1204     register_inet6addr_notifier(&sctp_inet6addr_notifier);
1205 
1206     if (inet6_add_protocol(&sctpv6_protocol, IPPROTO_SCTP) < 0)
1207         return -EAGAIN;
1208 
1209     return 0;
1210 }
1211 
1212 /* Unregister with inet6 layer. */
1213 void sctp_v6_del_protocol(void)
1214 {
1215     inet6_del_protocol(&sctpv6_protocol, IPPROTO_SCTP);
1216     unregister_inet6addr_notifier(&sctp_inet6addr_notifier);
1217 }
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