patch-2.4.23 linux-2.4.23/net/sctp/ipv6.c

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diff -urN linux-2.4.22/net/sctp/ipv6.c linux-2.4.23/net/sctp/ipv6.c
@@ -0,0 +1,868 @@
+/* SCTP kernel reference Implementation
+ * Copyright (c) 2001 Nokia, Inc.
+ * Copyright (c) 2001 La Monte H.P. Yarroll
+ * Copyright (c) 2002-2003 International Business Machines, 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>
+ *
+ * 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 <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 struct notifier_block sctp_inetaddr_notifier;
+
+/* FIXME: This macro needs to be moved to a common header file. */
+#define NIP6(addr) \
+        ntohs((addr)->s6_addr16[0]), \
+        ntohs((addr)->s6_addr16[1]), \
+        ntohs((addr)->s6_addr16[2]), \
+        ntohs((addr)->s6_addr16[3]), \
+        ntohs((addr)->s6_addr16[4]), \
+        ntohs((addr)->s6_addr16[5]), \
+        ntohs((addr)->s6_addr16[6]), \
+        ntohs((addr)->s6_addr16[7])
+
+/* ICMP error handler. */
+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(Icmp6InErrors);
+		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;
+	default:
+		break;
+	}
+
+	np = inet6_sk(sk);
+	icmpv6_err_convert(type, code, &err);
+	if (!sock_owned_by_user(sk) && np->recverr) {
+		sk->err = err;
+		sk->error_report(sk);
+	} else {  /* Only an error on timeout */
+		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;
+
+	fl.proto = sk->protocol;
+
+	/* Fill in the dest address from the route entry passed with the skb
+	 * and the source address from the transport.
+	 */
+	fl.fl6_dst = &transport->ipaddr.v6.sin6_addr;
+	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->bound_dev_if;
+	fl.uli_u.ports.sport = (sk)->sport;
+	fl.uli_u.ports.dport = transport->ipaddr.v6.sin6_port;
+
+	if (np->opt && np->opt->srcrt) {
+		struct rt0_hdr *rt0 = (struct rt0_hdr *) np->opt->srcrt;
+		fl.nl_u.ip6_u.daddr = 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(SctpOutSCTPPacks);
+
+	return ip6_xmit(sk, skb, &fl, np->opt);
+}
+
+/* Returns the dst cache entry for the given source and destination ip
+ * addresses.
+ */
+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 = {
+		.nl_u = { .ip6_u = { .daddr = &daddr->v6.sin6_addr, } } };
+
+	SCTP_DEBUG_PRINTK("%s: DST=%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x ",
+			  __FUNCTION__, NIP6(fl.fl6_dst));
+
+	if (saddr) {
+		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.
+ */
+void sctp_v6_get_saddr(struct sctp_association *asoc, struct dst_entry *dst,
+		       union sctp_addr *daddr, union sctp_addr *saddr)
+{
+	sctp_bind_addr_t *bp;
+	rwlock_t *addr_lock;
+	struct sockaddr_storage_list *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 sockaddr_storage_list, 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 sockaddr_storage_list *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 sockaddr_storage_list, 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 = (sk)->num;
+	addr->v6.sin6_addr = inet6_sk(sk)->rcv_saddr;
+}
+
+/* Initialize sk->rcv_saddr from sctp_addr. */
+static void sctp_v6_to_sk_saddr(union sctp_addr *addr, struct sock *sk)
+{
+	inet6_sk(sk)->rcv_saddr = addr->v6.sin6_addr;
+}
+
+/* Initialize sk->daddr from sctp_addr. */
+static void sctp_v6_to_sk_daddr(union sctp_addr *addr, struct sock *sk)
+{
+	inet6_sk(sk)->daddr = addr->v6.sin6_addr;
+}
+
+/* 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.
+ * FIXME: v4-mapped-v6.
+ */
+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)
+		return 0;
+	if (ipv6_addr_cmp(&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(const union sctp_addr *addr)
+{
+	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_UNICAST))
+		return 0;
+
+	return ipv6_chk_addr(in6, NULL);
+}
+
+/* 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)
+{
+	int ret = ipv6_addr_type(&addr->v6.sin6_addr);
+
+	/* FIXME:  v4-mapped-v6 address support. */
+
+	/* 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(). */
+struct sock *sctp_v6_create_accept_sk(struct sock *sk,
+				      struct sctp_association *asoc)
+{
+	struct sock *newsk;
+	struct inet_opt *newinet;
+	struct ipv6_pinfo *newnp, *np = inet6_sk(sk);
+
+	newsk = sk_alloc(PF_INET6, GFP_KERNEL, sizeof(struct sock));
+	if (!newsk)
+		goto out;
+
+	sock_init_data(NULL, newsk);
+	sk_set_owner(newsk, THIS_MODULE);
+
+	newsk->type = SOCK_STREAM;
+
+	newsk->prot = sk->prot;
+	newsk->no_check = sk->no_check;
+	newsk->reuse = sk->reuse;
+
+	newsk->destruct = inet_sock_destruct;
+	newsk->zapped = 0;
+	newsk->family = PF_INET6;
+	newsk->protocol = IPPROTO_SCTP;
+	newsk->backlog_rcv = sk->prot->backlog_rcv;
+	newsk->shutdown = sk->shutdown;
+
+	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().
+	 */
+	newsk->sport = sk->sport;
+	newnp->saddr = np->saddr;
+	newnp->rcv_saddr = np->rcv_saddr;
+	newsk->dport = htons(asoc->peer.port);
+	newnp->daddr =  asoc->peer.primary_addr.v6.sin6_addr;
+
+#ifdef INET_REFCNT_DEBUG
+	atomic_inc(&inet6_sock_nr);
+	atomic_inc(&inet_sock_nr);
+#endif
+
+	if (0 != newsk->prot->init(newsk)) {
+		inet_sock_release(newsk);
+		newsk = NULL;
+	}
+
+out:
+	return newsk;
+}
+
+/* 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;
+}
+
+/* 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;
+
+		sctp_inet6_msgname(msgname, addrlen);
+		sin6 = (struct sockaddr_in6 *)msgname;
+		sin6->sin6_port = htons(event->event_asoc->peer.port);
+		addr = &event->event_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 (AF_INET == addr->sa.sa_family) {
+			/* FIXME: Easy, but there was no way to test this
+			 * yet.
+			 */
+			return;
+		}
+
+		sin6from = &event->event_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;
+
+		/* FIXME: Map ipv4 address into v4-mapped-on-v6 address. */
+		if (__constant_htons(ETH_P_IP) == skb->protocol) {
+			/* FIXME:  The latest I-D added options for two
+			 * behaviors.
+			 */
+			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)
+{
+	/* FIXME:  v4-mapped-v6 addresses.  The I-D is still waffling
+	 * on what to do with sockaddr formats for PF_INET6 sockets.
+	 * For now assume we'll support both.
+	 */
+	switch (family) {
+	case AF_INET6:
+	case AF_INET:
+		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_opt *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_opt *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 = container_of(opt, struct sock, tp_pinfo.af_sctp);
+		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->bound_dev_if = addr->v6.sin6_scope_id;
+			if (!sk->bound_dev_if)
+				return 0;
+		}
+		af = opt->pf->af;
+	}
+	return af->available(addr);
+}
+
+/* Verify that the provided sockaddr looks bindable.   Common verification,
+ * has already been taken care of.
+ */
+static int sctp_inet6_send_verify(struct sctp_opt *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 = container_of(opt, struct sock, tp_pinfo.af_sctp);
+		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->bound_dev_if = addr->v6.sin6_scope_id;
+			if (!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_opt *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,
+	.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 = inet_setsockopt,
+	.getsockopt = inet_getsockopt,
+	.sendmsg    = inet_sendmsg,
+	.recvmsg    = inet_recvmsg,
+	.mmap       = sock_no_mmap,
+};
+
+static struct inet_protosw sctpv6_seqpacket_protosw = {
+	.type          = SOCK_SEQPACKET,
+	.protocol      = IPPROTO_SCTP,
+	.prot 	       = &sctp_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 	       = &sctp_prot,
+	.ops           = &inet6_seqpacket_ops,
+	.capability    = -1,
+	.no_check      = 0,
+	.flags         = SCTP_PROTOSW_FLAG,
+};
+
+static struct inet6_protocol sctpv6_protocol = {
+	.handler      = sctp_rcv,
+	.err_handler  = sctp_v6_err,
+	.next         = NULL,
+	.protocol     = IPPROTO_SCTP,
+	.copy         = 0,
+	.data         = NULL,
+	.name         = "SCTPv6",
+};
+
+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,
+	.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,
+	.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,
+	.af            = &sctp_ipv6_specific,
+};
+
+/* Initialize IPv6 support and register with inet6 stack.  */
+int sctp_v6_init(void)
+{
+	/* Register inet6 protocol. */
+	inet6_add_protocol(&sctpv6_protocol);
+
+	/* 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_inetaddr_notifier);
+
+	return 0;
+}
+
+/* IPv6 specific exit support. */
+void sctp_v6_exit(void)
+{
+	list_del(&sctp_ipv6_specific.list);
+	inet6_del_protocol(&sctpv6_protocol);
+	inet6_unregister_protosw(&sctpv6_seqpacket_protosw);
+	inet6_unregister_protosw(&sctpv6_stream_protosw);
+	unregister_inet6addr_notifier(&sctp_inetaddr_notifier);
+}
FUNET's LINUX-ADM group, linux-adm@nic.funet.fi
TCL-scripts by Sam Shen (who was at: slshen@lbl.gov)