Add the rt linux 4.1.3-rt3 as base
[kvmfornfv.git] / kernel / net / sctp / ipv6.c
diff --git a/kernel/net/sctp/ipv6.c b/kernel/net/sctp/ipv6.c
new file mode 100644 (file)
index 0000000..0e4198e
--- /dev/null
@@ -0,0 +1,1076 @@
+/* SCTP kernel implementation
+ * (C) Copyright IBM Corp. 2002, 2004
+ * Copyright (c) 2001 Nokia, Inc.
+ * Copyright (c) 2001 La Monte H.P. Yarroll
+ * Copyright (c) 2002-2003 Intel Corp.
+ *
+ * This file is part of the SCTP kernel implementation
+ *
+ * SCTP over IPv6.
+ *
+ * This SCTP implementation is free software;
+ * you can redistribute it and/or modify it under the terms of
+ * the GNU General Public License as published by
+ * the Free Software Foundation; either version 2, or (at your option)
+ * any later version.
+ *
+ * This SCTP implementation is distributed in the hope that it
+ * will be useful, but WITHOUT ANY WARRANTY; without even the implied
+ *                ************************
+ * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+ * See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with GNU CC; see the file COPYING.  If not, see
+ * <http://www.gnu.org/licenses/>.
+ *
+ * Please send any bug reports or fixes you make to the
+ * email address(es):
+ *    lksctp developers <linux-sctp@vger.kernel.org>
+ *
+ * Written or modified by:
+ *    Le Yanqun                    <yanqun.le@nokia.com>
+ *    Hui Huang                    <hui.huang@nokia.com>
+ *    La Monte H.P. Yarroll <piggy@acm.org>
+ *    Sridhar Samudrala            <sri@us.ibm.com>
+ *    Jon Grimm                    <jgrimm@us.ibm.com>
+ *    Ardelle Fan          <ardelle.fan@intel.com>
+ *
+ * Based on:
+ *     linux/net/ipv6/tcp_ipv6.c
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/module.h>
+#include <linux/errno.h>
+#include <linux/types.h>
+#include <linux/socket.h>
+#include <linux/sockios.h>
+#include <linux/net.h>
+#include <linux/in.h>
+#include <linux/in6.h>
+#include <linux/netdevice.h>
+#include <linux/init.h>
+#include <linux/ipsec.h>
+#include <linux/slab.h>
+
+#include <linux/ipv6.h>
+#include <linux/icmpv6.h>
+#include <linux/random.h>
+#include <linux/seq_file.h>
+
+#include <net/protocol.h>
+#include <net/ndisc.h>
+#include <net/ip.h>
+#include <net/ipv6.h>
+#include <net/transp_v6.h>
+#include <net/addrconf.h>
+#include <net/ip6_route.h>
+#include <net/inet_common.h>
+#include <net/inet_ecn.h>
+#include <net/sctp/sctp.h>
+
+#include <asm/uaccess.h>
+
+static inline int sctp_v6_addr_match_len(union sctp_addr *s1,
+                                        union sctp_addr *s2);
+static void sctp_v6_to_addr(union sctp_addr *addr, struct in6_addr *saddr,
+                             __be16 port);
+static int sctp_v6_cmp_addr(const union sctp_addr *addr1,
+                           const union sctp_addr *addr2);
+
+/* Event handler for inet6 address addition/deletion events.
+ * The sctp_local_addr_list needs to be protocted by a spin lock since
+ * multiple notifiers (say IPv4 and IPv6) may be running at the same
+ * time and thus corrupt the list.
+ * The reader side is protected with RCU.
+ */
+static int sctp_inet6addr_event(struct notifier_block *this, unsigned long ev,
+                               void *ptr)
+{
+       struct inet6_ifaddr *ifa = (struct inet6_ifaddr *)ptr;
+       struct sctp_sockaddr_entry *addr = NULL;
+       struct sctp_sockaddr_entry *temp;
+       struct net *net = dev_net(ifa->idev->dev);
+       int found = 0;
+
+       switch (ev) {
+       case NETDEV_UP:
+               addr = kmalloc(sizeof(struct sctp_sockaddr_entry), GFP_ATOMIC);
+               if (addr) {
+                       addr->a.v6.sin6_family = AF_INET6;
+                       addr->a.v6.sin6_port = 0;
+                       addr->a.v6.sin6_addr = ifa->addr;
+                       addr->a.v6.sin6_scope_id = ifa->idev->dev->ifindex;
+                       addr->valid = 1;
+                       spin_lock_bh(&net->sctp.local_addr_lock);
+                       list_add_tail_rcu(&addr->list, &net->sctp.local_addr_list);
+                       sctp_addr_wq_mgmt(net, addr, SCTP_ADDR_NEW);
+                       spin_unlock_bh(&net->sctp.local_addr_lock);
+               }
+               break;
+       case NETDEV_DOWN:
+               spin_lock_bh(&net->sctp.local_addr_lock);
+               list_for_each_entry_safe(addr, temp,
+                                       &net->sctp.local_addr_list, list) {
+                       if (addr->a.sa.sa_family == AF_INET6 &&
+                                       ipv6_addr_equal(&addr->a.v6.sin6_addr,
+                                               &ifa->addr)) {
+                               sctp_addr_wq_mgmt(net, addr, SCTP_ADDR_DEL);
+                               found = 1;
+                               addr->valid = 0;
+                               list_del_rcu(&addr->list);
+                               break;
+                       }
+               }
+               spin_unlock_bh(&net->sctp.local_addr_lock);
+               if (found)
+                       kfree_rcu(addr, rcu);
+               break;
+       }
+
+       return NOTIFY_DONE;
+}
+
+static struct notifier_block sctp_inet6addr_notifier = {
+       .notifier_call = sctp_inet6addr_event,
+};
+
+/* ICMP error handler. */
+static void sctp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
+                       u8 type, u8 code, int offset, __be32 info)
+{
+       struct inet6_dev *idev;
+       struct sock *sk;
+       struct sctp_association *asoc;
+       struct sctp_transport *transport;
+       struct ipv6_pinfo *np;
+       __u16 saveip, savesctp;
+       int err;
+       struct net *net = dev_net(skb->dev);
+
+       idev = in6_dev_get(skb->dev);
+
+       /* Fix up skb to look at the embedded net header. */
+       saveip   = skb->network_header;
+       savesctp = skb->transport_header;
+       skb_reset_network_header(skb);
+       skb_set_transport_header(skb, offset);
+       sk = sctp_err_lookup(net, AF_INET6, skb, sctp_hdr(skb), &asoc, &transport);
+       /* Put back, the original pointers. */
+       skb->network_header   = saveip;
+       skb->transport_header = savesctp;
+       if (!sk) {
+               ICMP6_INC_STATS_BH(net, idev, ICMP6_MIB_INERRORS);
+               goto out;
+       }
+
+       /* Warning:  The sock lock is held.  Remember to call
+        * sctp_err_finish!
+        */
+
+       switch (type) {
+       case ICMPV6_PKT_TOOBIG:
+               if (ip6_sk_accept_pmtu(sk))
+                       sctp_icmp_frag_needed(sk, asoc, transport, ntohl(info));
+               goto out_unlock;
+       case ICMPV6_PARAMPROB:
+               if (ICMPV6_UNK_NEXTHDR == code) {
+                       sctp_icmp_proto_unreachable(sk, asoc, transport);
+                       goto out_unlock;
+               }
+               break;
+       case NDISC_REDIRECT:
+               sctp_icmp_redirect(sk, transport, skb);
+               goto out_unlock;
+       default:
+               break;
+       }
+
+       np = inet6_sk(sk);
+       icmpv6_err_convert(type, code, &err);
+       if (!sock_owned_by_user(sk) && np->recverr) {
+               sk->sk_err = err;
+               sk->sk_error_report(sk);
+       } else {  /* Only an error on timeout */
+               sk->sk_err_soft = err;
+       }
+
+out_unlock:
+       sctp_err_finish(sk, asoc);
+out:
+       if (likely(idev != NULL))
+               in6_dev_put(idev);
+}
+
+static int sctp_v6_xmit(struct sk_buff *skb, struct sctp_transport *transport)
+{
+       struct sock *sk = skb->sk;
+       struct ipv6_pinfo *np = inet6_sk(sk);
+       struct flowi6 *fl6 = &transport->fl.u.ip6;
+
+       pr_debug("%s: skb:%p, len:%d, src:%pI6 dst:%pI6\n", __func__, skb,
+                skb->len, &fl6->saddr, &fl6->daddr);
+
+       IP6_ECN_flow_xmit(sk, fl6->flowlabel);
+
+       if (!(transport->param_flags & SPP_PMTUD_ENABLE))
+               skb->ignore_df = 1;
+
+       SCTP_INC_STATS(sock_net(sk), SCTP_MIB_OUTSCTPPACKS);
+
+       return ip6_xmit(sk, skb, fl6, np->opt, np->tclass);
+}
+
+/* Returns the dst cache entry for the given source and destination ip
+ * addresses.
+ */
+static void sctp_v6_get_dst(struct sctp_transport *t, union sctp_addr *saddr,
+                           struct flowi *fl, struct sock *sk)
+{
+       struct sctp_association *asoc = t->asoc;
+       struct dst_entry *dst = NULL;
+       struct flowi6 *fl6 = &fl->u.ip6;
+       struct sctp_bind_addr *bp;
+       struct ipv6_pinfo *np = inet6_sk(sk);
+       struct sctp_sockaddr_entry *laddr;
+       union sctp_addr *baddr = NULL;
+       union sctp_addr *daddr = &t->ipaddr;
+       union sctp_addr dst_saddr;
+       struct in6_addr *final_p, final;
+       __u8 matchlen = 0;
+       __u8 bmatchlen;
+       sctp_scope_t scope;
+
+       memset(fl6, 0, sizeof(struct flowi6));
+       fl6->daddr = daddr->v6.sin6_addr;
+       fl6->fl6_dport = daddr->v6.sin6_port;
+       fl6->flowi6_proto = IPPROTO_SCTP;
+       if (ipv6_addr_type(&daddr->v6.sin6_addr) & IPV6_ADDR_LINKLOCAL)
+               fl6->flowi6_oif = daddr->v6.sin6_scope_id;
+
+       pr_debug("%s: dst=%pI6 ", __func__, &fl6->daddr);
+
+       if (asoc)
+               fl6->fl6_sport = htons(asoc->base.bind_addr.port);
+
+       if (saddr) {
+               fl6->saddr = saddr->v6.sin6_addr;
+               fl6->fl6_sport = saddr->v6.sin6_port;
+
+               pr_debug("src=%pI6 - ", &fl6->saddr);
+       }
+
+       final_p = fl6_update_dst(fl6, np->opt, &final);
+       dst = ip6_dst_lookup_flow(sk, fl6, final_p);
+       if (!asoc || saddr)
+               goto out;
+
+       bp = &asoc->base.bind_addr;
+       scope = sctp_scope(daddr);
+       /* ip6_dst_lookup has filled in the fl6->saddr for us.  Check
+        * to see if we can use it.
+        */
+       if (!IS_ERR(dst)) {
+               /* Walk through the bind address list and look for a bind
+                * address that matches the source address of the returned dst.
+                */
+               sctp_v6_to_addr(&dst_saddr, &fl6->saddr, htons(bp->port));
+               rcu_read_lock();
+               list_for_each_entry_rcu(laddr, &bp->address_list, list) {
+                       if (!laddr->valid || laddr->state == SCTP_ADDR_DEL ||
+                           (laddr->state != SCTP_ADDR_SRC &&
+                            !asoc->src_out_of_asoc_ok))
+                               continue;
+
+                       /* Do not compare against v4 addrs */
+                       if ((laddr->a.sa.sa_family == AF_INET6) &&
+                           (sctp_v6_cmp_addr(&dst_saddr, &laddr->a))) {
+                               rcu_read_unlock();
+                               goto out;
+                       }
+               }
+               rcu_read_unlock();
+               /* None of the bound addresses match the source address of the
+                * dst. So release it.
+                */
+               dst_release(dst);
+               dst = NULL;
+       }
+
+       /* Walk through the bind address list and try to get the
+        * best source address for a given destination.
+        */
+       rcu_read_lock();
+       list_for_each_entry_rcu(laddr, &bp->address_list, list) {
+               if (!laddr->valid)
+                       continue;
+               if ((laddr->state == SCTP_ADDR_SRC) &&
+                   (laddr->a.sa.sa_family == AF_INET6) &&
+                   (scope <= sctp_scope(&laddr->a))) {
+                       bmatchlen = sctp_v6_addr_match_len(daddr, &laddr->a);
+                       if (!baddr || (matchlen < bmatchlen)) {
+                               baddr = &laddr->a;
+                               matchlen = bmatchlen;
+                       }
+               }
+       }
+       rcu_read_unlock();
+
+       if (baddr) {
+               fl6->saddr = baddr->v6.sin6_addr;
+               fl6->fl6_sport = baddr->v6.sin6_port;
+               final_p = fl6_update_dst(fl6, np->opt, &final);
+               dst = ip6_dst_lookup_flow(sk, fl6, final_p);
+       }
+
+out:
+       if (!IS_ERR_OR_NULL(dst)) {
+               struct rt6_info *rt;
+
+               rt = (struct rt6_info *)dst;
+               t->dst = dst;
+               t->dst_cookie = rt->rt6i_node ? rt->rt6i_node->fn_sernum : 0;
+               pr_debug("rt6_dst:%pI6 rt6_src:%pI6\n", &rt->rt6i_dst.addr,
+                        &fl6->saddr);
+       } else {
+               t->dst = NULL;
+
+               pr_debug("no route\n");
+       }
+}
+
+/* Returns the number of consecutive initial bits that match in the 2 ipv6
+ * addresses.
+ */
+static inline int sctp_v6_addr_match_len(union sctp_addr *s1,
+                                        union sctp_addr *s2)
+{
+       return ipv6_addr_diff(&s1->v6.sin6_addr, &s2->v6.sin6_addr);
+}
+
+/* Fills in the source address(saddr) based on the destination address(daddr)
+ * and asoc's bind address list.
+ */
+static void sctp_v6_get_saddr(struct sctp_sock *sk,
+                             struct sctp_transport *t,
+                             struct flowi *fl)
+{
+       struct flowi6 *fl6 = &fl->u.ip6;
+       union sctp_addr *saddr = &t->saddr;
+
+       pr_debug("%s: asoc:%p dst:%p\n", __func__, t->asoc, t->dst);
+
+       if (t->dst) {
+               saddr->v6.sin6_family = AF_INET6;
+               saddr->v6.sin6_addr = fl6->saddr;
+       }
+}
+
+/* Make a copy of all potential local addresses. */
+static void sctp_v6_copy_addrlist(struct list_head *addrlist,
+                                 struct net_device *dev)
+{
+       struct inet6_dev *in6_dev;
+       struct inet6_ifaddr *ifp;
+       struct sctp_sockaddr_entry *addr;
+
+       rcu_read_lock();
+       if ((in6_dev = __in6_dev_get(dev)) == NULL) {
+               rcu_read_unlock();
+               return;
+       }
+
+       read_lock_bh(&in6_dev->lock);
+       list_for_each_entry(ifp, &in6_dev->addr_list, if_list) {
+               /* Add the address to the local list.  */
+               addr = kzalloc(sizeof(*addr), GFP_ATOMIC);
+               if (addr) {
+                       addr->a.v6.sin6_family = AF_INET6;
+                       addr->a.v6.sin6_port = 0;
+                       addr->a.v6.sin6_addr = ifp->addr;
+                       addr->a.v6.sin6_scope_id = dev->ifindex;
+                       addr->valid = 1;
+                       INIT_LIST_HEAD(&addr->list);
+                       list_add_tail(&addr->list, addrlist);
+               }
+       }
+
+       read_unlock_bh(&in6_dev->lock);
+       rcu_read_unlock();
+}
+
+/* Initialize a sockaddr_storage from in incoming skb. */
+static void sctp_v6_from_skb(union sctp_addr *addr, struct sk_buff *skb,
+                            int is_saddr)
+{
+       __be16 *port;
+       struct sctphdr *sh;
+
+       port = &addr->v6.sin6_port;
+       addr->v6.sin6_family = AF_INET6;
+       addr->v6.sin6_flowinfo = 0; /* FIXME */
+       addr->v6.sin6_scope_id = ((struct inet6_skb_parm *)skb->cb)->iif;
+
+       sh = sctp_hdr(skb);
+       if (is_saddr) {
+               *port  = sh->source;
+               addr->v6.sin6_addr = ipv6_hdr(skb)->saddr;
+       } else {
+               *port = sh->dest;
+               addr->v6.sin6_addr = ipv6_hdr(skb)->daddr;
+       }
+}
+
+/* Initialize an sctp_addr from a socket. */
+static void sctp_v6_from_sk(union sctp_addr *addr, struct sock *sk)
+{
+       addr->v6.sin6_family = AF_INET6;
+       addr->v6.sin6_port = 0;
+       addr->v6.sin6_addr = sk->sk_v6_rcv_saddr;
+}
+
+/* Initialize sk->sk_rcv_saddr from sctp_addr. */
+static void sctp_v6_to_sk_saddr(union sctp_addr *addr, struct sock *sk)
+{
+       if (addr->sa.sa_family == AF_INET) {
+               sk->sk_v6_rcv_saddr.s6_addr32[0] = 0;
+               sk->sk_v6_rcv_saddr.s6_addr32[1] = 0;
+               sk->sk_v6_rcv_saddr.s6_addr32[2] = htonl(0x0000ffff);
+               sk->sk_v6_rcv_saddr.s6_addr32[3] =
+                       addr->v4.sin_addr.s_addr;
+       } else {
+               sk->sk_v6_rcv_saddr = addr->v6.sin6_addr;
+       }
+}
+
+/* Initialize sk->sk_daddr from sctp_addr. */
+static void sctp_v6_to_sk_daddr(union sctp_addr *addr, struct sock *sk)
+{
+       if (addr->sa.sa_family == AF_INET) {
+               sk->sk_v6_daddr.s6_addr32[0] = 0;
+               sk->sk_v6_daddr.s6_addr32[1] = 0;
+               sk->sk_v6_daddr.s6_addr32[2] = htonl(0x0000ffff);
+               sk->sk_v6_daddr.s6_addr32[3] = addr->v4.sin_addr.s_addr;
+       } else {
+               sk->sk_v6_daddr = addr->v6.sin6_addr;
+       }
+}
+
+/* Initialize a sctp_addr from an address parameter. */
+static void sctp_v6_from_addr_param(union sctp_addr *addr,
+                                   union sctp_addr_param *param,
+                                   __be16 port, int iif)
+{
+       addr->v6.sin6_family = AF_INET6;
+       addr->v6.sin6_port = port;
+       addr->v6.sin6_flowinfo = 0; /* BUG */
+       addr->v6.sin6_addr = param->v6.addr;
+       addr->v6.sin6_scope_id = iif;
+}
+
+/* Initialize an address parameter from a sctp_addr and return the length
+ * of the address parameter.
+ */
+static int sctp_v6_to_addr_param(const union sctp_addr *addr,
+                                union sctp_addr_param *param)
+{
+       int length = sizeof(sctp_ipv6addr_param_t);
+
+       param->v6.param_hdr.type = SCTP_PARAM_IPV6_ADDRESS;
+       param->v6.param_hdr.length = htons(length);
+       param->v6.addr = addr->v6.sin6_addr;
+
+       return length;
+}
+
+/* Initialize a sctp_addr from struct in6_addr. */
+static void sctp_v6_to_addr(union sctp_addr *addr, struct in6_addr *saddr,
+                             __be16 port)
+{
+       addr->sa.sa_family = AF_INET6;
+       addr->v6.sin6_port = port;
+       addr->v6.sin6_addr = *saddr;
+}
+
+/* Compare addresses exactly.
+ * v4-mapped-v6 is also in consideration.
+ */
+static int sctp_v6_cmp_addr(const union sctp_addr *addr1,
+                           const union sctp_addr *addr2)
+{
+       if (addr1->sa.sa_family != addr2->sa.sa_family) {
+               if (addr1->sa.sa_family == AF_INET &&
+                   addr2->sa.sa_family == AF_INET6 &&
+                   ipv6_addr_v4mapped(&addr2->v6.sin6_addr)) {
+                       if (addr2->v6.sin6_port == addr1->v4.sin_port &&
+                           addr2->v6.sin6_addr.s6_addr32[3] ==
+                           addr1->v4.sin_addr.s_addr)
+                               return 1;
+               }
+               if (addr2->sa.sa_family == AF_INET &&
+                   addr1->sa.sa_family == AF_INET6 &&
+                   ipv6_addr_v4mapped(&addr1->v6.sin6_addr)) {
+                       if (addr1->v6.sin6_port == addr2->v4.sin_port &&
+                           addr1->v6.sin6_addr.s6_addr32[3] ==
+                           addr2->v4.sin_addr.s_addr)
+                               return 1;
+               }
+               return 0;
+       }
+       if (!ipv6_addr_equal(&addr1->v6.sin6_addr, &addr2->v6.sin6_addr))
+               return 0;
+       /* If this is a linklocal address, compare the scope_id. */
+       if (ipv6_addr_type(&addr1->v6.sin6_addr) & IPV6_ADDR_LINKLOCAL) {
+               if (addr1->v6.sin6_scope_id && addr2->v6.sin6_scope_id &&
+                   (addr1->v6.sin6_scope_id != addr2->v6.sin6_scope_id)) {
+                       return 0;
+               }
+       }
+
+       return 1;
+}
+
+/* Initialize addr struct to INADDR_ANY. */
+static void sctp_v6_inaddr_any(union sctp_addr *addr, __be16 port)
+{
+       memset(addr, 0x00, sizeof(union sctp_addr));
+       addr->v6.sin6_family = AF_INET6;
+       addr->v6.sin6_port = port;
+}
+
+/* Is this a wildcard address? */
+static int sctp_v6_is_any(const union sctp_addr *addr)
+{
+       return ipv6_addr_any(&addr->v6.sin6_addr);
+}
+
+/* Should this be available for binding?   */
+static int sctp_v6_available(union sctp_addr *addr, struct sctp_sock *sp)
+{
+       int type;
+       const struct in6_addr *in6 = (const struct in6_addr *)&addr->v6.sin6_addr;
+
+       type = ipv6_addr_type(in6);
+       if (IPV6_ADDR_ANY == type)
+               return 1;
+       if (type == IPV6_ADDR_MAPPED) {
+               if (sp && ipv6_only_sock(sctp_opt2sk(sp)))
+                       return 0;
+               sctp_v6_map_v4(addr);
+               return sctp_get_af_specific(AF_INET)->available(addr, sp);
+       }
+       if (!(type & IPV6_ADDR_UNICAST))
+               return 0;
+
+       return ipv6_chk_addr(sock_net(&sp->inet.sk), in6, NULL, 0);
+}
+
+/* This function checks if the address is a valid address to be used for
+ * SCTP.
+ *
+ * Output:
+ * Return 0 - If the address is a non-unicast or an illegal address.
+ * Return 1 - If the address is a unicast.
+ */
+static int sctp_v6_addr_valid(union sctp_addr *addr,
+                             struct sctp_sock *sp,
+                             const struct sk_buff *skb)
+{
+       int ret = ipv6_addr_type(&addr->v6.sin6_addr);
+
+       /* Support v4-mapped-v6 address. */
+       if (ret == IPV6_ADDR_MAPPED) {
+               /* Note: This routine is used in input, so v4-mapped-v6
+                * are disallowed here when there is no sctp_sock.
+                */
+               if (sp && ipv6_only_sock(sctp_opt2sk(sp)))
+                       return 0;
+               sctp_v6_map_v4(addr);
+               return sctp_get_af_specific(AF_INET)->addr_valid(addr, sp, skb);
+       }
+
+       /* Is this a non-unicast address */
+       if (!(ret & IPV6_ADDR_UNICAST))
+               return 0;
+
+       return 1;
+}
+
+/* What is the scope of 'addr'?  */
+static sctp_scope_t sctp_v6_scope(union sctp_addr *addr)
+{
+       int v6scope;
+       sctp_scope_t retval;
+
+       /* The IPv6 scope is really a set of bit fields.
+        * See IFA_* in <net/if_inet6.h>.  Map to a generic SCTP scope.
+        */
+
+       v6scope = ipv6_addr_scope(&addr->v6.sin6_addr);
+       switch (v6scope) {
+       case IFA_HOST:
+               retval = SCTP_SCOPE_LOOPBACK;
+               break;
+       case IFA_LINK:
+               retval = SCTP_SCOPE_LINK;
+               break;
+       case IFA_SITE:
+               retval = SCTP_SCOPE_PRIVATE;
+               break;
+       default:
+               retval = SCTP_SCOPE_GLOBAL;
+               break;
+       }
+
+       return retval;
+}
+
+/* Create and initialize a new sk for the socket to be returned by accept(). */
+static struct sock *sctp_v6_create_accept_sk(struct sock *sk,
+                                            struct sctp_association *asoc)
+{
+       struct sock *newsk;
+       struct ipv6_pinfo *newnp, *np = inet6_sk(sk);
+       struct sctp6_sock *newsctp6sk;
+
+       newsk = sk_alloc(sock_net(sk), PF_INET6, GFP_KERNEL, sk->sk_prot);
+       if (!newsk)
+               goto out;
+
+       sock_init_data(NULL, newsk);
+
+       sctp_copy_sock(newsk, sk, asoc);
+       sock_reset_flag(sk, SOCK_ZAPPED);
+
+       newsctp6sk = (struct sctp6_sock *)newsk;
+       inet_sk(newsk)->pinet6 = &newsctp6sk->inet6;
+
+       sctp_sk(newsk)->v4mapped = sctp_sk(sk)->v4mapped;
+
+       newnp = inet6_sk(newsk);
+
+       memcpy(newnp, np, sizeof(struct ipv6_pinfo));
+
+       /* Initialize sk's sport, dport, rcv_saddr and daddr for getsockname()
+        * and getpeername().
+        */
+       sctp_v6_to_sk_daddr(&asoc->peer.primary_addr, newsk);
+
+       newsk->sk_v6_rcv_saddr = sk->sk_v6_rcv_saddr;
+
+       sk_refcnt_debug_inc(newsk);
+
+       if (newsk->sk_prot->init(newsk)) {
+               sk_common_release(newsk);
+               newsk = NULL;
+       }
+
+out:
+       return newsk;
+}
+
+/* Format a sockaddr for return to user space. This makes sure the return is
+ * AF_INET or AF_INET6 depending on the SCTP_I_WANT_MAPPED_V4_ADDR option.
+ */
+static int sctp_v6_addr_to_user(struct sctp_sock *sp, union sctp_addr *addr)
+{
+       if (sp->v4mapped) {
+               if (addr->sa.sa_family == AF_INET)
+                       sctp_v4_map_v6(addr);
+       } else {
+               if (addr->sa.sa_family == AF_INET6 &&
+                   ipv6_addr_v4mapped(&addr->v6.sin6_addr))
+                       sctp_v6_map_v4(addr);
+       }
+
+       if (addr->sa.sa_family == AF_INET)
+               return sizeof(struct sockaddr_in);
+       return sizeof(struct sockaddr_in6);
+}
+
+/* Where did this skb come from?  */
+static int sctp_v6_skb_iif(const struct sk_buff *skb)
+{
+       struct inet6_skb_parm *opt = (struct inet6_skb_parm *) skb->cb;
+       return opt->iif;
+}
+
+/* Was this packet marked by Explicit Congestion Notification? */
+static int sctp_v6_is_ce(const struct sk_buff *skb)
+{
+       return *((__u32 *)(ipv6_hdr(skb))) & htonl(1 << 20);
+}
+
+/* Dump the v6 addr to the seq file. */
+static void sctp_v6_seq_dump_addr(struct seq_file *seq, union sctp_addr *addr)
+{
+       seq_printf(seq, "%pI6 ", &addr->v6.sin6_addr);
+}
+
+static void sctp_v6_ecn_capable(struct sock *sk)
+{
+       inet6_sk(sk)->tclass |= INET_ECN_ECT_0;
+}
+
+/* Initialize a PF_INET msgname from a ulpevent. */
+static void sctp_inet6_event_msgname(struct sctp_ulpevent *event,
+                                    char *msgname, int *addrlen)
+{
+       union sctp_addr *addr;
+       struct sctp_association *asoc;
+       union sctp_addr *paddr;
+
+       if (!msgname)
+               return;
+
+       addr = (union sctp_addr *)msgname;
+       asoc = event->asoc;
+       paddr = &asoc->peer.primary_addr;
+
+       if (paddr->sa.sa_family == AF_INET) {
+               addr->v4.sin_family = AF_INET;
+               addr->v4.sin_port = htons(asoc->peer.port);
+               addr->v4.sin_addr = paddr->v4.sin_addr;
+       } else {
+               addr->v6.sin6_family = AF_INET6;
+               addr->v6.sin6_flowinfo = 0;
+               if (ipv6_addr_type(&paddr->v6.sin6_addr) & IPV6_ADDR_LINKLOCAL)
+                       addr->v6.sin6_scope_id = paddr->v6.sin6_scope_id;
+               else
+                       addr->v6.sin6_scope_id = 0;
+               addr->v6.sin6_port = htons(asoc->peer.port);
+               addr->v6.sin6_addr = paddr->v6.sin6_addr;
+       }
+
+       *addrlen = sctp_v6_addr_to_user(sctp_sk(asoc->base.sk), addr);
+}
+
+/* Initialize a msg_name from an inbound skb. */
+static void sctp_inet6_skb_msgname(struct sk_buff *skb, char *msgname,
+                                  int *addr_len)
+{
+       union sctp_addr *addr;
+       struct sctphdr *sh;
+
+       if (!msgname)
+               return;
+
+       addr = (union sctp_addr *)msgname;
+       sh = sctp_hdr(skb);
+
+       if (ip_hdr(skb)->version == 4) {
+               addr->v4.sin_family = AF_INET;
+               addr->v4.sin_port = sh->source;
+               addr->v4.sin_addr.s_addr =  ip_hdr(skb)->saddr;
+       } else {
+               addr->v6.sin6_family = AF_INET6;
+               addr->v6.sin6_flowinfo = 0;
+               addr->v6.sin6_port = sh->source;
+               addr->v6.sin6_addr = ipv6_hdr(skb)->saddr;
+               if (ipv6_addr_type(&addr->v6.sin6_addr) & IPV6_ADDR_LINKLOCAL) {
+                       struct sctp_ulpevent *ev = sctp_skb2event(skb);
+                       addr->v6.sin6_scope_id = ev->iif;
+               }
+       }
+
+       *addr_len = sctp_v6_addr_to_user(sctp_sk(skb->sk), addr);
+}
+
+/* Do we support this AF? */
+static int sctp_inet6_af_supported(sa_family_t family, struct sctp_sock *sp)
+{
+       switch (family) {
+       case AF_INET6:
+               return 1;
+       /* v4-mapped-v6 addresses */
+       case AF_INET:
+               if (!__ipv6_only_sock(sctp_opt2sk(sp)))
+                       return 1;
+       default:
+               return 0;
+       }
+}
+
+/* Address matching with wildcards allowed.  This extra level
+ * of indirection lets us choose whether a PF_INET6 should
+ * disallow any v4 addresses if we so choose.
+ */
+static int sctp_inet6_cmp_addr(const union sctp_addr *addr1,
+                              const union sctp_addr *addr2,
+                              struct sctp_sock *opt)
+{
+       struct sctp_af *af1, *af2;
+       struct sock *sk = sctp_opt2sk(opt);
+
+       af1 = sctp_get_af_specific(addr1->sa.sa_family);
+       af2 = sctp_get_af_specific(addr2->sa.sa_family);
+
+       if (!af1 || !af2)
+               return 0;
+
+       /* If the socket is IPv6 only, v4 addrs will not match */
+       if (__ipv6_only_sock(sk) && af1 != af2)
+               return 0;
+
+       /* Today, wildcard AF_INET/AF_INET6. */
+       if (sctp_is_any(sk, addr1) || sctp_is_any(sk, addr2))
+               return 1;
+
+       if (addr1->sa.sa_family != addr2->sa.sa_family)
+               return 0;
+
+       return af1->cmp_addr(addr1, addr2);
+}
+
+/* Verify that the provided sockaddr looks bindable.   Common verification,
+ * has already been taken care of.
+ */
+static int sctp_inet6_bind_verify(struct sctp_sock *opt, union sctp_addr *addr)
+{
+       struct sctp_af *af;
+
+       /* ASSERT: address family has already been verified. */
+       if (addr->sa.sa_family != AF_INET6)
+               af = sctp_get_af_specific(addr->sa.sa_family);
+       else {
+               int type = ipv6_addr_type(&addr->v6.sin6_addr);
+               struct net_device *dev;
+
+               if (type & IPV6_ADDR_LINKLOCAL) {
+                       struct net *net;
+                       if (!addr->v6.sin6_scope_id)
+                               return 0;
+                       net = sock_net(&opt->inet.sk);
+                       rcu_read_lock();
+                       dev = dev_get_by_index_rcu(net, addr->v6.sin6_scope_id);
+                       if (!dev ||
+                           !ipv6_chk_addr(net, &addr->v6.sin6_addr, dev, 0)) {
+                               rcu_read_unlock();
+                               return 0;
+                       }
+                       rcu_read_unlock();
+               }
+
+               af = opt->pf->af;
+       }
+       return af->available(addr, opt);
+}
+
+/* Verify that the provided sockaddr looks sendable.   Common verification,
+ * has already been taken care of.
+ */
+static int sctp_inet6_send_verify(struct sctp_sock *opt, union sctp_addr *addr)
+{
+       struct sctp_af *af = NULL;
+
+       /* ASSERT: address family has already been verified. */
+       if (addr->sa.sa_family != AF_INET6)
+               af = sctp_get_af_specific(addr->sa.sa_family);
+       else {
+               int type = ipv6_addr_type(&addr->v6.sin6_addr);
+               struct net_device *dev;
+
+               if (type & IPV6_ADDR_LINKLOCAL) {
+                       if (!addr->v6.sin6_scope_id)
+                               return 0;
+                       rcu_read_lock();
+                       dev = dev_get_by_index_rcu(sock_net(&opt->inet.sk),
+                                                  addr->v6.sin6_scope_id);
+                       rcu_read_unlock();
+                       if (!dev)
+                               return 0;
+               }
+               af = opt->pf->af;
+       }
+
+       return af != NULL;
+}
+
+/* Fill in Supported Address Type information for INIT and INIT-ACK
+ * chunks.   Note: In the future, we may want to look at sock options
+ * to determine whether a PF_INET6 socket really wants to have IPV4
+ * addresses.
+ * Returns number of addresses supported.
+ */
+static int sctp_inet6_supported_addrs(const struct sctp_sock *opt,
+                                     __be16 *types)
+{
+       types[0] = SCTP_PARAM_IPV6_ADDRESS;
+       if (!opt || !ipv6_only_sock(sctp_opt2sk(opt))) {
+               types[1] = SCTP_PARAM_IPV4_ADDRESS;
+               return 2;
+       }
+       return 1;
+}
+
+/* Handle SCTP_I_WANT_MAPPED_V4_ADDR for getpeername() and getsockname() */
+static int sctp_getname(struct socket *sock, struct sockaddr *uaddr,
+                       int *uaddr_len, int peer)
+{
+       int rc;
+
+       rc = inet6_getname(sock, uaddr, uaddr_len, peer);
+
+       if (rc != 0)
+               return rc;
+
+       *uaddr_len = sctp_v6_addr_to_user(sctp_sk(sock->sk),
+                                         (union sctp_addr *)uaddr);
+
+       return rc;
+}
+
+static const struct proto_ops inet6_seqpacket_ops = {
+       .family            = PF_INET6,
+       .owner             = THIS_MODULE,
+       .release           = inet6_release,
+       .bind              = inet6_bind,
+       .connect           = inet_dgram_connect,
+       .socketpair        = sock_no_socketpair,
+       .accept            = inet_accept,
+       .getname           = sctp_getname,
+       .poll              = sctp_poll,
+       .ioctl             = inet6_ioctl,
+       .listen            = sctp_inet_listen,
+       .shutdown          = inet_shutdown,
+       .setsockopt        = sock_common_setsockopt,
+       .getsockopt        = sock_common_getsockopt,
+       .sendmsg           = inet_sendmsg,
+       .recvmsg           = sock_common_recvmsg,
+       .mmap              = sock_no_mmap,
+#ifdef CONFIG_COMPAT
+       .compat_setsockopt = compat_sock_common_setsockopt,
+       .compat_getsockopt = compat_sock_common_getsockopt,
+#endif
+};
+
+static struct inet_protosw sctpv6_seqpacket_protosw = {
+       .type          = SOCK_SEQPACKET,
+       .protocol      = IPPROTO_SCTP,
+       .prot          = &sctpv6_prot,
+       .ops           = &inet6_seqpacket_ops,
+       .flags         = SCTP_PROTOSW_FLAG
+};
+static struct inet_protosw sctpv6_stream_protosw = {
+       .type          = SOCK_STREAM,
+       .protocol      = IPPROTO_SCTP,
+       .prot          = &sctpv6_prot,
+       .ops           = &inet6_seqpacket_ops,
+       .flags         = SCTP_PROTOSW_FLAG,
+};
+
+static int sctp6_rcv(struct sk_buff *skb)
+{
+       return sctp_rcv(skb) ? -1 : 0;
+}
+
+static const struct inet6_protocol sctpv6_protocol = {
+       .handler      = sctp6_rcv,
+       .err_handler  = sctp_v6_err,
+       .flags        = INET6_PROTO_NOPOLICY | INET6_PROTO_FINAL,
+};
+
+static struct sctp_af sctp_af_inet6 = {
+       .sa_family         = AF_INET6,
+       .sctp_xmit         = sctp_v6_xmit,
+       .setsockopt        = ipv6_setsockopt,
+       .getsockopt        = ipv6_getsockopt,
+       .get_dst           = sctp_v6_get_dst,
+       .get_saddr         = sctp_v6_get_saddr,
+       .copy_addrlist     = sctp_v6_copy_addrlist,
+       .from_skb          = sctp_v6_from_skb,
+       .from_sk           = sctp_v6_from_sk,
+       .from_addr_param   = sctp_v6_from_addr_param,
+       .to_addr_param     = sctp_v6_to_addr_param,
+       .cmp_addr          = sctp_v6_cmp_addr,
+       .scope             = sctp_v6_scope,
+       .addr_valid        = sctp_v6_addr_valid,
+       .inaddr_any        = sctp_v6_inaddr_any,
+       .is_any            = sctp_v6_is_any,
+       .available         = sctp_v6_available,
+       .skb_iif           = sctp_v6_skb_iif,
+       .is_ce             = sctp_v6_is_ce,
+       .seq_dump_addr     = sctp_v6_seq_dump_addr,
+       .ecn_capable       = sctp_v6_ecn_capable,
+       .net_header_len    = sizeof(struct ipv6hdr),
+       .sockaddr_len      = sizeof(struct sockaddr_in6),
+#ifdef CONFIG_COMPAT
+       .compat_setsockopt = compat_ipv6_setsockopt,
+       .compat_getsockopt = compat_ipv6_getsockopt,
+#endif
+};
+
+static struct sctp_pf sctp_pf_inet6 = {
+       .event_msgname = sctp_inet6_event_msgname,
+       .skb_msgname   = sctp_inet6_skb_msgname,
+       .af_supported  = sctp_inet6_af_supported,
+       .cmp_addr      = sctp_inet6_cmp_addr,
+       .bind_verify   = sctp_inet6_bind_verify,
+       .send_verify   = sctp_inet6_send_verify,
+       .supported_addrs = sctp_inet6_supported_addrs,
+       .create_accept_sk = sctp_v6_create_accept_sk,
+       .addr_to_user  = sctp_v6_addr_to_user,
+       .to_sk_saddr   = sctp_v6_to_sk_saddr,
+       .to_sk_daddr   = sctp_v6_to_sk_daddr,
+       .af            = &sctp_af_inet6,
+};
+
+/* Initialize IPv6 support and register with socket layer.  */
+void sctp_v6_pf_init(void)
+{
+       /* Register the SCTP specific PF_INET6 functions. */
+       sctp_register_pf(&sctp_pf_inet6, PF_INET6);
+
+       /* Register the SCTP specific AF_INET6 functions. */
+       sctp_register_af(&sctp_af_inet6);
+}
+
+void sctp_v6_pf_exit(void)
+{
+       list_del(&sctp_af_inet6.list);
+}
+
+/* Initialize IPv6 support and register with socket layer.  */
+int sctp_v6_protosw_init(void)
+{
+       int rc;
+
+       rc = proto_register(&sctpv6_prot, 1);
+       if (rc)
+               return rc;
+
+       /* Add SCTPv6(UDP and TCP style) to inetsw6 linked list. */
+       inet6_register_protosw(&sctpv6_seqpacket_protosw);
+       inet6_register_protosw(&sctpv6_stream_protosw);
+
+       return 0;
+}
+
+void sctp_v6_protosw_exit(void)
+{
+       inet6_unregister_protosw(&sctpv6_seqpacket_protosw);
+       inet6_unregister_protosw(&sctpv6_stream_protosw);
+       proto_unregister(&sctpv6_prot);
+}
+
+
+/* Register with inet6 layer. */
+int sctp_v6_add_protocol(void)
+{
+       /* Register notifier for inet6 address additions/deletions. */
+       register_inet6addr_notifier(&sctp_inet6addr_notifier);
+
+       if (inet6_add_protocol(&sctpv6_protocol, IPPROTO_SCTP) < 0)
+               return -EAGAIN;
+
+       return 0;
+}
+
+/* Unregister with inet6 layer. */
+void sctp_v6_del_protocol(void)
+{
+       inet6_del_protocol(&sctpv6_protocol, IPPROTO_SCTP);
+       unregister_inet6addr_notifier(&sctp_inet6addr_notifier);
+}