Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 1013 insertions, 0 deletions

diff --git a/net/sctp/ipv6.c b/net/sctp/ipv6.c
new file mode 100644
index 000000000000..e42c74e3ec1e
--- /dev/null
+++ b/net/sctp/ipv6.c
@@ -0,0 +1,1013 @@
+/* SCTP kernel reference 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 reference Implementation
+ *
+ * SCTP over IPv6.
+ *
+ * The SCTP reference 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.
+ *
+ * The SCTP reference 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, write to
+ * the Free Software Foundation, 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ *
+ * Please send any bug reports or fixes you make to the
+ * email address(es):
+ *    lksctp developers <lksctp-developers@lists.sourceforge.net>
+ *
+ * Or submit a bug report through the following website:
+ *    http://www.sf.net/projects/lksctp
+ *
+ * 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
+ *
+ * Any bugs reported given to us we will try to fix... any fixes shared will
+ * be incorporated into the next SCTP release.
+ */
+
+#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/sched.h>
+#include <linux/in.h>
+#include <linux/in6.h>
+#include <linux/netdevice.h>
+#include <linux/init.h>
+#include <linux/ipsec.h>
+
+#include <linux/ipv6.h>
+#include <linux/icmpv6.h>
+#include <linux/random.h>
+#include <linux/seq_file.h>
+
+#include <net/protocol.h>
+#include <net/tcp.h>
+#include <net/ndisc.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>
+
+extern int sctp_inetaddr_event(struct notifier_block *, unsigned long, void *);
+static struct notifier_block sctp_inet6addr_notifier = {
+        .notifier_call = sctp_inetaddr_event,
+};
+
+/* ICMP error handler. */
+SCTP_STATIC void sctp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
+                             int type, int code, int offset, __u32 info)
+{
+        struct inet6_dev *idev;
+        struct ipv6hdr *iph = (struct ipv6hdr *)skb->data;
+        struct sctphdr *sh = (struct sctphdr *)(skb->data + offset);
+        struct sock *sk;
+        struct sctp_endpoint *ep;
+        struct sctp_association *asoc;
+        struct sctp_transport *transport;
+        struct ipv6_pinfo *np;
+        char *saveip, *savesctp;
+        int err;
+
+        idev = in6_dev_get(skb->dev);
+
+        /* Fix up skb to look at the embedded net header. */
+        saveip = skb->nh.raw;
+        savesctp  = skb->h.raw;
+        skb->nh.ipv6h = iph;
+        skb->h.raw = (char *)sh;
+        sk = sctp_err_lookup(AF_INET6, skb, sh, &ep, &asoc, &transport);
+        /* Put back, the original pointers. */
+        skb->nh.raw = saveip;
+        skb->h.raw = savesctp;
+        if (!sk) {
+                ICMP6_INC_STATS_BH(idev, ICMP6_MIB_INERRORS);
+                goto out;
+        }
+
+        /* Warning:  The sock lock is held.  Remember to call
+         * sctp_err_finish!
+         */
+
+        switch (type) {
+        case ICMPV6_PKT_TOOBIG:
+                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, ep, asoc, transport);
+                        goto out_unlock;
+                }
+                break;
+        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, ep, asoc);
+out:
+        if (likely(idev != NULL))
+                in6_dev_put(idev);
+}
+
+/* Based on tcp_v6_xmit() in tcp_ipv6.c. */
+static int sctp_v6_xmit(struct sk_buff *skb, struct sctp_transport *transport,
+                        int ipfragok)
+{
+        struct sock *sk = skb->sk;
+        struct ipv6_pinfo *np = inet6_sk(sk);
+        struct flowi fl;
+
+        memset(&fl, 0, sizeof(fl));
+
+        fl.proto = sk->sk_protocol;
+
+        /* Fill in the dest address from the route entry passed with the skb
+         * and the source address from the transport.
+         */
+        ipv6_addr_copy(&fl.fl6_dst, &transport->ipaddr.v6.sin6_addr);
+        ipv6_addr_copy(&fl.fl6_src, &transport->saddr.v6.sin6_addr);
+
+        fl.fl6_flowlabel = np->flow_label;
+        IP6_ECN_flow_xmit(sk, fl.fl6_flowlabel);
+        if (ipv6_addr_type(&fl.fl6_src) & IPV6_ADDR_LINKLOCAL)
+                fl.oif = transport->saddr.v6.sin6_scope_id;
+        else
+                fl.oif = sk->sk_bound_dev_if;
+        fl.fl_ip_sport = inet_sk(sk)->sport;
+        fl.fl_ip_dport = transport->ipaddr.v6.sin6_port;
+
+        if (np->opt && np->opt->srcrt) {
+                struct rt0_hdr *rt0 = (struct rt0_hdr *) np->opt->srcrt;
+                ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
+        }
+
+        SCTP_DEBUG_PRINTK("%s: skb:%p, len:%d, "
+                          "src:%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x "
+                          "dst:%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x\n",
+                          __FUNCTION__, skb, skb->len,
+                          NIP6(fl.fl6_src), NIP6(fl.fl6_dst));
+
+        SCTP_INC_STATS(SCTP_MIB_OUTSCTPPACKS);
+
+        return ip6_xmit(sk, skb, &fl, np->opt, ipfragok);
+}
+
+/* Returns the dst cache entry for the given source and destination ip
+ * addresses.
+ */
+static struct dst_entry *sctp_v6_get_dst(struct sctp_association *asoc,
+                                         union sctp_addr *daddr,
+                                         union sctp_addr *saddr)
+{
+        struct dst_entry *dst;
+        struct flowi fl;
+
+        memset(&fl, 0, sizeof(fl));
+        ipv6_addr_copy(&fl.fl6_dst, &daddr->v6.sin6_addr);
+        if (ipv6_addr_type(&daddr->v6.sin6_addr) & IPV6_ADDR_LINKLOCAL)
+                fl.oif = daddr->v6.sin6_scope_id;
+        
+
+        SCTP_DEBUG_PRINTK("%s: DST=%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x ",
+                          __FUNCTION__, NIP6(fl.fl6_dst));
+
+        if (saddr) {
+                ipv6_addr_copy(&fl.fl6_src, &saddr->v6.sin6_addr);
+                SCTP_DEBUG_PRINTK(
+                        "SRC=%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x - ",
+                        NIP6(fl.fl6_src));
+        }
+
+        dst = ip6_route_output(NULL, &fl);
+        if (dst) {
+                struct rt6_info *rt;
+                rt = (struct rt6_info *)dst;
+                SCTP_DEBUG_PRINTK(
+                        "rt6_dst:%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x "
+                        "rt6_src:%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x\n",
+                        NIP6(rt->rt6i_dst.addr), NIP6(rt->rt6i_src.addr));
+        } else {
+                SCTP_DEBUG_PRINTK("NO ROUTE\n");
+        }
+
+        return dst;
+}
+
+/* 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)
+{
+        struct in6_addr *a1 = &s1->v6.sin6_addr;
+        struct in6_addr *a2 = &s2->v6.sin6_addr;
+        int i, j;
+
+        for (i = 0; i < 4 ; i++) {
+                __u32 a1xora2;
+
+                a1xora2 = a1->s6_addr32[i] ^ a2->s6_addr32[i];
+
+                if ((j = fls(ntohl(a1xora2))))
+                        return (i * 32 + 32 - j);
+        }
+
+        return (i*32);
+}
+
+/* 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_association *asoc,
+                              struct dst_entry *dst,
+                              union sctp_addr *daddr,
+                              union sctp_addr *saddr)
+{
+        struct sctp_bind_addr *bp;
+        rwlock_t *addr_lock;
+        struct sctp_sockaddr_entry *laddr;
+        struct list_head *pos;
+        sctp_scope_t scope;
+        union sctp_addr *baddr = NULL;
+        __u8 matchlen = 0;
+        __u8 bmatchlen;
+
+        SCTP_DEBUG_PRINTK("%s: asoc:%p dst:%p "
+                          "daddr:%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x ",
+                          __FUNCTION__, asoc, dst, NIP6(daddr->v6.sin6_addr));
+
+        if (!asoc) {
+                ipv6_get_saddr(dst, &daddr->v6.sin6_addr,&saddr->v6.sin6_addr);
+                SCTP_DEBUG_PRINTK("saddr from ipv6_get_saddr: "
+                                  "%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x\n",
+                                  NIP6(saddr->v6.sin6_addr));
+                return;
+        }
+
+        scope = sctp_scope(daddr);
+
+        bp = &asoc->base.bind_addr;
+        addr_lock = &asoc->base.addr_lock;
+
+        /* Go through the bind address list and find the best source address
+         * that matches the scope of the destination address.
+         */
+        sctp_read_lock(addr_lock);
+        list_for_each(pos, &bp->address_list) {
+                laddr = list_entry(pos, struct sctp_sockaddr_entry, list);
+                if ((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;
+                        }
+                }
+        }
+
+        if (baddr) {
+                memcpy(saddr, baddr, sizeof(union sctp_addr));
+                SCTP_DEBUG_PRINTK("saddr: "
+                                  "%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x\n",
+                                  NIP6(saddr->v6.sin6_addr));
+        } else {
+                printk(KERN_ERR "%s: asoc:%p Could not find a valid source "
+                       "address for the "
+                       "dest:%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x\n",
+                       __FUNCTION__, asoc, NIP6(daddr->v6.sin6_addr));
+        }
+
+        sctp_read_unlock(addr_lock);
+}
+
+/* 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;
+
+        read_lock(&addrconf_lock);
+        if ((in6_dev = __in6_dev_get(dev)) == NULL) {
+                read_unlock(&addrconf_lock);
+                return;
+        }
+
+        read_lock(&in6_dev->lock);
+        for (ifp = in6_dev->addr_list; ifp; ifp = ifp->if_next) {
+                /* Add the address to the local list.  */
+                addr = t_new(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 = ifp->addr;
+                        addr->a.v6.sin6_scope_id = dev->ifindex;
+                        INIT_LIST_HEAD(&addr->list);
+                        list_add_tail(&addr->list, addrlist);
+                }
+        }
+
+        read_unlock(&in6_dev->lock);
+        read_unlock(&addrconf_lock);
+}
+
+/* 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)
+{
+        void *from;
+        __u16 *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 = (struct sctphdr *) skb->h.raw;
+        if (is_saddr) {
+                *port  = ntohs(sh->source);
+                from = &skb->nh.ipv6h->saddr;
+        } else {
+                *port = ntohs(sh->dest);
+                from = &skb->nh.ipv6h->daddr;
+        }
+        ipv6_addr_copy(&addr->v6.sin6_addr, from);
+}
+
+/* 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 = inet_sk(sk)->num;
+        addr->v6.sin6_addr = inet6_sk(sk)->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 && sctp_sk(sk)->v4mapped) {
+                inet6_sk(sk)->rcv_saddr.s6_addr32[0] = 0;
+                inet6_sk(sk)->rcv_saddr.s6_addr32[1] = 0;
+                inet6_sk(sk)->rcv_saddr.s6_addr32[2] = htonl(0x0000ffff);
+                inet6_sk(sk)->rcv_saddr.s6_addr32[3] =
+                        addr->v4.sin_addr.s_addr;
+        } else {
+                inet6_sk(sk)->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 && sctp_sk(sk)->v4mapped) {
+                inet6_sk(sk)->daddr.s6_addr32[0] = 0;
+                inet6_sk(sk)->daddr.s6_addr32[1] = 0;
+                inet6_sk(sk)->daddr.s6_addr32[2] = htonl(0x0000ffff);
+                inet6_sk(sk)->daddr.s6_addr32[3] = addr->v4.sin_addr.s_addr;
+        } else {
+                inet6_sk(sk)->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,
+                                    __u16 port, int iif)
+{
+        addr->v6.sin6_family = AF_INET6;
+        addr->v6.sin6_port = port;
+        addr->v6.sin6_flowinfo = 0; /* BUG */
+        ipv6_addr_copy(&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 = ntohs(length);
+        ipv6_addr_copy(&param->v6.addr, &addr->v6.sin6_addr);
+
+        return length;
+}
+
+/* Initialize a sctp_addr from a dst_entry. */
+static void sctp_v6_dst_saddr(union sctp_addr *addr, struct dst_entry *dst,
+                              unsigned short port)
+{
+        struct rt6_info *rt = (struct rt6_info *)dst;
+        addr->sa.sa_family = AF_INET6;
+        addr->v6.sin6_port = port;
+        ipv6_addr_copy(&addr->v6.sin6_addr, &rt->rt6i_src.addr);
+}
+
+/* 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_MAPPED == ipv6_addr_type(&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_MAPPED == ipv6_addr_type(&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, unsigned short 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)
+{
+        int type;
+        type = ipv6_addr_type((struct in6_addr *)&addr->v6.sin6_addr);
+        return IPV6_ADDR_ANY == type;
+}
+
+/* Should this be available for binding?   */
+static int sctp_v6_available(union sctp_addr *addr, struct sctp_sock *sp)
+{
+        int type;
+        struct in6_addr *in6 = (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 && !sp->v4mapped)
+                        return 0;
+                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(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)
+{
+        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 || !sp->v4mapped)
+                        return 0;
+                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);
+        }
+
+        /* 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 inet_sock *inet = inet_sk(sk);
+        struct sock *newsk;
+        struct inet_sock *newinet;
+        struct ipv6_pinfo *newnp, *np = inet6_sk(sk);
+        struct sctp6_sock *newsctp6sk;
+
+        newsk = sk_alloc(PF_INET6, GFP_KERNEL, sk->sk_prot, 1);
+        if (!newsk)
+                goto out;
+
+        sock_init_data(NULL, newsk);
+
+        newsk->sk_type = SOCK_STREAM;
+
+        newsk->sk_prot = sk->sk_prot;
+        newsk->sk_no_check = sk->sk_no_check;
+        newsk->sk_reuse = sk->sk_reuse;
+
+        newsk->sk_destruct = inet_sock_destruct;
+        newsk->sk_family = PF_INET6;
+        newsk->sk_protocol = IPPROTO_SCTP;
+        newsk->sk_backlog_rcv = sk->sk_prot->backlog_rcv;
+        newsk->sk_shutdown = sk->sk_shutdown;
+        sock_reset_flag(sk, SOCK_ZAPPED);
+
+        newsctp6sk = (struct sctp6_sock *)newsk;
+        inet_sk(newsk)->pinet6 = &newsctp6sk->inet6;
+
+        newinet = inet_sk(newsk);
+        newnp = inet6_sk(newsk);
+
+        memcpy(newnp, np, sizeof(struct ipv6_pinfo));
+
+        /* Initialize sk's sport, dport, rcv_saddr and daddr for getsockname()
+         * and getpeername().
+         */
+        newinet->sport = inet->sport;
+        newnp->saddr = np->saddr;
+        newnp->rcv_saddr = np->rcv_saddr;
+        newinet->dport = htons(asoc->peer.port);
+        sctp_v6_to_sk_daddr(&asoc->peer.primary_addr, newsk);
+
+        /* Init the ipv4 part of the socket since we can have sockets
+         * using v6 API for ipv4.
+         */
+        newinet->uc_ttl = -1;
+        newinet->mc_loop = 1;
+        newinet->mc_ttl = 1;
+        newinet->mc_index = 0;
+        newinet->mc_list = NULL;
+
+        if (ipv4_config.no_pmtu_disc)
+                newinet->pmtudisc = IP_PMTUDISC_DONT;
+        else
+                newinet->pmtudisc = IP_PMTUDISC_WANT;
+
+#ifdef INET_REFCNT_DEBUG
+        atomic_inc(&inet6_sock_nr);
+        atomic_inc(&inet_sock_nr);
+#endif
+
+        if (newsk->sk_prot->init(newsk)) {
+                sk_common_release(newsk);
+                newsk = NULL;
+        }
+
+out:
+        return newsk;
+}
+
+/* Map v4 address to mapped v6 address */
+static void sctp_v6_addr_v4map(struct sctp_sock *sp, union sctp_addr *addr)
+{
+        if (sp->v4mapped && AF_INET == addr->sa.sa_family)
+                sctp_v4_map_v6(addr);
+}
+
+/* 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 *)(skb->nh.ipv6h)) & 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, "%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x ",
+                   NIP6(addr->v6.sin6_addr));
+}
+
+/* Initialize a PF_INET6 socket msg_name. */
+static void sctp_inet6_msgname(char *msgname, int *addr_len)
+{
+        struct sockaddr_in6 *sin6;
+
+        sin6 = (struct sockaddr_in6 *)msgname;
+        sin6->sin6_family = AF_INET6;
+        sin6->sin6_flowinfo = 0;
+        sin6->sin6_scope_id = 0; /*FIXME */
+        *addr_len = sizeof(struct sockaddr_in6);
+}
+
+/* Initialize a PF_INET msgname from a ulpevent. */
+static void sctp_inet6_event_msgname(struct sctp_ulpevent *event,
+                                     char *msgname, int *addrlen)
+{
+        struct sockaddr_in6 *sin6, *sin6from;
+
+        if (msgname) {
+                union sctp_addr *addr;
+                struct sctp_association *asoc;
+
+                asoc = event->asoc;
+                sctp_inet6_msgname(msgname, addrlen);
+                sin6 = (struct sockaddr_in6 *)msgname;
+                sin6->sin6_port = htons(asoc->peer.port);
+                addr = &asoc->peer.primary_addr;
+
+                /* Note: If we go to a common v6 format, this code
+                 * will change.
+                 */
+
+                /* Map ipv4 address into v4-mapped-on-v6 address.  */
+                if (sctp_sk(asoc->base.sk)->v4mapped &&
+                    AF_INET == addr->sa.sa_family) {
+                        sctp_v4_map_v6((union sctp_addr *)sin6);
+                        sin6->sin6_addr.s6_addr32[3] =
+                                addr->v4.sin_addr.s_addr;
+                        return;
+                }
+
+                sin6from = &asoc->peer.primary_addr.v6;
+                ipv6_addr_copy(&sin6->sin6_addr, &sin6from->sin6_addr);
+                if (ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL)
+                        sin6->sin6_scope_id = sin6from->sin6_scope_id;
+        }
+}
+
+/* Initialize a msg_name from an inbound skb. */
+static void sctp_inet6_skb_msgname(struct sk_buff *skb, char *msgname,
+                                   int *addr_len)
+{
+        struct sctphdr *sh;
+        struct sockaddr_in6 *sin6;
+
+        if (msgname) {
+                sctp_inet6_msgname(msgname, addr_len);
+                sin6 = (struct sockaddr_in6 *)msgname;
+                sh = (struct sctphdr *)skb->h.raw;
+                sin6->sin6_port = sh->source;
+
+                /* Map ipv4 address into v4-mapped-on-v6 address. */
+                if (sctp_sk(skb->sk)->v4mapped &&
+                    skb->nh.iph->version == 4) {
+                        sctp_v4_map_v6((union sctp_addr *)sin6);
+                        sin6->sin6_addr.s6_addr32[3] = skb->nh.iph->saddr;
+                        return;
+                }
+
+                /* Otherwise, just copy the v6 address. */
+                ipv6_addr_copy(&sin6->sin6_addr, &skb->nh.ipv6h->saddr);
+                if (ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL) {
+                        struct sctp_ulpevent *ev = sctp_skb2event(skb);
+                        sin6->sin6_scope_id = ev->iif;
+                }
+        }
+}
+
+/* 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)) && sp->v4mapped)
+                        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;
+
+        af1 = sctp_get_af_specific(addr1->sa.sa_family);
+        af2 = sctp_get_af_specific(addr2->sa.sa_family);
+
+        if (!af1 || !af2)
+                return 0;
+        /* Today, wildcard AF_INET/AF_INET6. */
+        if (sctp_is_any(addr1) || sctp_is_any(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 {
+                struct sock *sk;
+                int type = ipv6_addr_type(&addr->v6.sin6_addr);
+                sk = sctp_opt2sk(opt);
+                if (type & IPV6_ADDR_LINKLOCAL) {
+                        /* Note: Behavior similar to af_inet6.c:
+                         *  1) Overrides previous bound_dev_if
+                         *  2) Destructive even if bind isn't successful.
+                         */
+
+                        if (addr->v6.sin6_scope_id)
+                                sk->sk_bound_dev_if = addr->v6.sin6_scope_id;
+                        if (!sk->sk_bound_dev_if)
+                                return 0;
+                }
+                af = opt->pf->af;
+        }
+        return af->available(addr, opt);
+}
+
+/* Verify that the provided sockaddr looks bindable.   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 {
+                struct sock *sk;
+                int type = ipv6_addr_type(&addr->v6.sin6_addr);
+                sk = sctp_opt2sk(opt);
+                if (type & IPV6_ADDR_LINKLOCAL) {
+                        /* Note: Behavior similar to af_inet6.c:
+                         *  1) Overrides previous bound_dev_if
+                         *  2) Destructive even if bind isn't successful.
+                         */
+
+                        if (addr->v6.sin6_scope_id)
+                                sk->sk_bound_dev_if = addr->v6.sin6_scope_id;
+                        if (!sk->sk_bound_dev_if)
+                                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,
+                                      __u16 *types)
+{
+        types[0] = SCTP_PARAM_IPV4_ADDRESS;
+        types[1] = SCTP_PARAM_IPV6_ADDRESS;
+        return 2;
+}
+
+static 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    = inet6_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,
+};
+
+static struct inet_protosw sctpv6_seqpacket_protosw = {
+        .type          = SOCK_SEQPACKET,
+        .protocol      = IPPROTO_SCTP,
+        .prot          = &sctpv6_prot,
+        .ops           = &inet6_seqpacket_ops,
+        .capability    = -1,
+        .no_check      = 0,
+        .flags         = SCTP_PROTOSW_FLAG
+};
+static struct inet_protosw sctpv6_stream_protosw = {
+        .type          = SOCK_STREAM,
+        .protocol      = IPPROTO_SCTP,
+        .prot          = &sctpv6_prot,
+        .ops           = &inet6_seqpacket_ops,
+        .capability    = -1,
+        .no_check      = 0,
+        .flags         = SCTP_PROTOSW_FLAG,
+};
+
+static int sctp6_rcv(struct sk_buff **pskb, unsigned int *nhoffp)
+{
+        return sctp_rcv(*pskb) ? -1 : 0;
+}
+
+static 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_ipv6_specific = {
+        .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,
+        .to_sk_saddr     = sctp_v6_to_sk_saddr,
+        .to_sk_daddr     = sctp_v6_to_sk_daddr,
+        .from_addr_param = sctp_v6_from_addr_param,
+        .to_addr_param   = sctp_v6_to_addr_param,
+        .dst_saddr       = sctp_v6_dst_saddr,
+        .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,
+        .net_header_len  = sizeof(struct ipv6hdr),
+        .sockaddr_len    = sizeof(struct sockaddr_in6),
+        .sa_family       = AF_INET6,
+};
+
+static struct sctp_pf sctp_pf_inet6_specific = {
+        .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_v4map    = sctp_v6_addr_v4map,
+        .af            = &sctp_ipv6_specific,
+};
+
+/* Initialize IPv6 support and register with inet6 stack.  */
+int sctp_v6_init(void)
+{
+        int rc = proto_register(&sctpv6_prot, 1);
+
+        if (rc)
+                goto out;
+        /* Register inet6 protocol. */
+        rc = -EAGAIN;
+        if (inet6_add_protocol(&sctpv6_protocol, IPPROTO_SCTP) < 0)
+                goto out_unregister_sctp_proto;
+
+        /* Add SCTPv6(UDP and TCP style) to inetsw6 linked list. */
+        inet6_register_protosw(&sctpv6_seqpacket_protosw);
+        inet6_register_protosw(&sctpv6_stream_protosw);
+
+        /* Register the SCTP specific PF_INET6 functions. */
+        sctp_register_pf(&sctp_pf_inet6_specific, PF_INET6);
+
+        /* Register the SCTP specific AF_INET6 functions. */
+        sctp_register_af(&sctp_ipv6_specific);
+
+        /* Register notifier for inet6 address additions/deletions. */
+        register_inet6addr_notifier(&sctp_inet6addr_notifier);
+        rc = 0;
+out:
+        return rc;
+out_unregister_sctp_proto:
+        proto_unregister(&sctpv6_prot);
+        goto out;
+}
+
+/* IPv6 specific exit support. */
+void sctp_v6_exit(void)
+{
+        list_del(&sctp_ipv6_specific.list);
+        inet6_del_protocol(&sctpv6_protocol, IPPROTO_SCTP);
+        inet6_unregister_protosw(&sctpv6_seqpacket_protosw);
+        inet6_unregister_protosw(&sctpv6_stream_protosw);
+        unregister_inet6addr_notifier(&sctp_inet6addr_notifier);
+        proto_unregister(&sctpv6_prot);
+}