[SCTP] Last of the v4/v6 partioning (for now)

Mostly code on the bind path, splitting out to pf and af family
specific functions.   Minor code cleanups/fixes mixed in.  

include/net/sctp/sctp.h

@@ -123,8 +123,8 @@ extern sctp_protocol_t sctp_proto;
 extern struct sock *sctp_get_ctl_sock(void);
 extern int sctp_copy_local_addr_list(sctp_protocol_t *, sctp_bind_addr_t *,
 				     sctp_scope_t, int priority, int flags);
-extern sctp_pf_t *sctp_get_pf_specific(int family);
-extern void sctp_set_pf_specific(int family, sctp_pf_t *);
+extern struct sctp_pf *sctp_get_pf_specific(sa_family_t family);
+extern int sctp_register_pf(struct sctp_pf *, sa_family_t);
 
 /*
  * sctp_socket.c

include/net/sctp/structs.h

@@ -234,7 +234,7 @@ struct SCTP_protocol {
  * Pointers to address related SCTP functions.
  * (i.e. things that depend on the address family.)
  */
-typedef struct sctp_func {
+struct sctp_af {
 	int		(*queue_xmit)	(struct sk_buff *skb);
 	int 		(*setsockopt)	(struct sock *sk,
 					 int level,
@@ -259,27 +259,34 @@ typedef struct sctp_func {
 	void            (*from_skb)     (union sctp_addr *,
 					 struct sk_buff *skb,
 					 int saddr);
+	void            (*from_sk)      (union sctp_addr *,
+					 struct sock *sk);
+	void            (*to_sk)        (union sctp_addr *,
+					 struct sock *sk);
 	int             (*addr_valid)   (union sctp_addr *);
 	sctp_scope_t    (*scope) (union sctp_addr *);
 	void            (*inaddr_any)   (union sctp_addr *, unsigned short);
 	int             (*is_any)       (const union sctp_addr *);
+	int             (*available)    (const union sctp_addr *);
 	__u16		net_header_len;
 	int		sockaddr_len;
 	sa_family_t	sa_family;
 	struct list_head list;
-} sctp_func_t;
+};
 
-sctp_func_t *sctp_get_af_specific(sa_family_t);
+struct sctp_af *sctp_get_af_specific(sa_family_t);
+int sctp_register_af(struct sctp_af *);
 
 /* Protocol family functions. */
 typedef struct sctp_pf {
 	void (*event_msgname)(sctp_ulpevent_t *, char *, int *);
-	void (*skb_msgname)(struct sk_buff *, char *, int *);
-	int  (*af_supported)(sa_family_t);
+	void (*skb_msgname)  (struct sk_buff *, char *, int *);
+	int  (*af_supported) (sa_family_t);
 	int  (*cmp_addr) (const union sctp_addr *,
 			  const union sctp_addr *,
 			  struct sctp_opt *);
-	struct sctp_func *af;
+	int  (*bind_verify) (struct sctp_opt *, union sctp_addr *);
+	struct sctp_af *af;
 } sctp_pf_t;
 
 /* SCTP Socket type: UDP or TCP style. */
@@ -623,7 +630,7 @@ struct SCTP_transport {
 	union sctp_addr ipaddr;
 
 	/* These are the functions we call to handle LLP stuff.  */
-	sctp_func_t *af_specific;
+	struct sctp_af *af_specific;
 
 	/* Which association do we belong to?  */
 	sctp_association_t *asoc;

net/ipv6/ipv6_syms.c

@@ -24,3 +24,4 @@ EXPORT_SYMBOL(inet6_bind);
 EXPORT_SYMBOL(inet6_getname);
 EXPORT_SYMBOL(inet6_ioctl);
 EXPORT_SYMBOL(ipv6_get_saddr);
+EXPORT_SYMBOL(ipv6_chk_addr);

net/sctp/associola.c

@@ -642,7 +642,7 @@ __u16 __sctp_association_get_next_ssn(sctp_association_t *asoc, __u16 sid)
 int sctp_cmp_addr_exact(const union sctp_addr *ss1,
 			const union sctp_addr *ss2)
 {
-	struct sctp_func *af;
+	struct sctp_af *af;
 
 	af = sctp_get_af_specific(ss1->sa.sa_family);
 	if (!af)

net/sctp/bind_addr.c

@@ -327,7 +327,7 @@ static int sctp_copy_one_addr(sctp_bind_addr_t *dest, union sctp_addr *addr,
 /* Is this a wildcard address?  */
 int sctp_is_any(const union sctp_addr *addr)
 {
-	struct sctp_func *af = sctp_get_af_specific(addr->sa.sa_family);
+	struct sctp_af *af = sctp_get_af_specific(addr->sa.sa_family);
 	if (!af)
 		return 0;
 	return af->is_any(addr);
@@ -362,7 +362,7 @@ int sctp_in_scope(const union sctp_addr *addr, sctp_scope_t scope)
 /* What is the scope of 'addr'?  */
 sctp_scope_t sctp_scope(const union sctp_addr *addr)
 {
-	struct sctp_func *af;
+	struct sctp_af *af;
 
 	af = sctp_get_af_specific(addr->sa.sa_family);
 	if (!af)

net/sctp/input.c

@@ -96,7 +96,7 @@ int sctp_rcv(struct sk_buff *skb)
 	struct sctphdr *sh;
 	union sctp_addr src;
 	union sctp_addr dest;
-	struct sctp_func *af;
+	struct sctp_af *af;
 	int ret = 0;
 
 	if (skb->pkt_type!=PACKET_HOST)

net/sctp/ipv6.c

@@ -140,8 +140,8 @@ static inline int sctp_v6_xmit(struct sk_buff *skb)
 		 * to disallow loopback when the scoping rules have
 		 * not bound loopback to the endpoint.
 		 */
-		if (sctp_ipv6_addr_type(&saddr) & IPV6_ADDR_LOOPBACK) {
-			if (!(sctp_ipv6_addr_type(&np->daddr) &
+		if (ipv6_addr_type(&saddr) & IPV6_ADDR_LOOPBACK) {
+			if (!(ipv6_addr_type(&np->daddr) &
 			      IPV6_ADDR_LOOPBACK)) {
 				ipv6_addr_copy(&saddr, &np->daddr);
 			}
@@ -261,6 +261,20 @@ static void sctp_v6_from_skb(union sctp_addr *addr,struct sk_buff *skb,
 	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->rcv_saddr from sctp_addr. */
+static void sctp_v6_to_sk(union sctp_addr *addr, struct sock *sk)
+{
+	inet6_sk(sk)->rcv_saddr = 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)
 {
@@ -270,7 +284,7 @@ static void sctp_v6_dst_saddr(union sctp_addr *addr, struct dst_entry *dst)
 }
 
 /* Compare addresses exactly.  Well.. almost exactly; ignore scope_id
- * for now.  FIXME.
+ * for now.  FIXME: v4-mapped-v6.
  */
 static int sctp_v6_cmp_addr(const union sctp_addr *addr1,
 			    const union sctp_addr *addr2)
@@ -300,6 +314,22 @@ static int sctp_v6_is_any(const union sctp_addr *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.
  *
@@ -309,7 +339,7 @@ static int sctp_v6_is_any(const union sctp_addr *addr)
  */
 static int sctp_v6_addr_valid(union sctp_addr *addr)
 {
-	int ret = sctp_ipv6_addr_type(&addr->v6.sin6_addr);
+	int ret = ipv6_addr_type(&addr->v6.sin6_addr);
 
 	/* FIXME:  v4-mapped-v6 address support. */
 
@@ -448,7 +478,7 @@ static int sctp_inet6_cmp_addr(const union sctp_addr *addr1,
 			       const union sctp_addr *addr2,
 			       struct sctp_opt *opt)
 {
-	struct sctp_func *af1, *af2;
+	struct sctp_af *af1, *af2;
 
 	af1 = sctp_get_af_specific(addr1->sa.sa_family);
 	af2 = sctp_get_af_specific(addr2->sa.sa_family);
@@ -465,7 +495,21 @@ static int sctp_inet6_cmp_addr(const union sctp_addr *addr1,
 	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
+		af = opt->pf->af;
+
+	return af->available(addr);
+}
 
 static struct proto_ops inet6_seqpacket_ops = {
 	.family     = PF_INET6,
@@ -501,29 +545,33 @@ static struct inet6_protocol sctpv6_protocol = {
 	.err_handler  = sctp_v6_err,
 };
 
-static sctp_func_t sctp_ipv6_specific = {
+static struct sctp_af sctp_ipv6_specific = {
 	.queue_xmit      = sctp_v6_xmit,
 	.setsockopt    = ipv6_setsockopt,
 	.getsockopt      = ipv6_getsockopt,
 	.get_dst	 = sctp_v6_get_dst,
 	.copy_addrlist   = sctp_v6_copy_addrlist,
 	.from_skb        = sctp_v6_from_skb,
+	.from_sk         = sctp_v6_from_sk,
+	.to_sk           = sctp_v6_to_sk,
 	.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,
 	.net_header_len  = sizeof(struct ipv6hdr),
 	.sockaddr_len    = sizeof(struct sockaddr_in6),
 	.sa_family       = AF_INET6,
 };
 
-static sctp_pf_t sctp_pf_inet6_specific = {
+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,
 	.af            = &sctp_ipv6_specific,
 };
 
@@ -538,11 +586,10 @@ int sctp_v6_init(void)
 	inet6_register_protosw(&sctpv6_protosw);
 
 	/* Register the SCTP specfic PF_INET6 functions. */
-	sctp_set_pf_specific(PF_INET6, &sctp_pf_inet6_specific);
+	sctp_register_pf(&sctp_pf_inet6_specific, PF_INET6);
 
-	/* Fill in address family info.  */
-	INIT_LIST_HEAD(&sctp_ipv6_specific.list);
-	list_add_tail(&sctp_ipv6_specific.list, &sctp_proto.address_families);
+	/* Register the SCTP specfic AF_INET6 functions. */
+	sctp_register_af(&sctp_ipv6_specific);
 
 	return 0;
 }

net/sctp/protocol.c

@@ -67,8 +67,10 @@ struct sctp_mib sctp_statistics[NR_CPUS * 2];
  */
 static struct socket *sctp_ctl_socket;
 
-static sctp_pf_t *sctp_pf_inet6_specific;
-static sctp_pf_t *sctp_pf_inet_specific;
+static struct sctp_pf *sctp_pf_inet6_specific;
+static struct sctp_pf *sctp_pf_inet_specific;
+static struct sctp_af *sctp_af_v4_specific;
+static struct sctp_af *sctp_af_v6_specific;
 
 extern struct net_proto_family inet_family_ops;
 
@@ -140,12 +142,12 @@ static void __sctp_get_local_addr_list(sctp_protocol_t *proto)
 {
 	struct net_device *dev;
 	struct list_head *pos;
-	struct sctp_func *af;
+	struct sctp_af *af;
 
 	read_lock(&dev_base_lock);
 	for (dev = dev_base; dev; dev = dev->next) {
 		list_for_each(pos, &proto->address_families) {
-			af = list_entry(pos, sctp_func_t, list);
+			af = list_entry(pos, struct sctp_af, list);
 			af->copy_addrlist(&proto->local_addr_list, dev);
 		}
 	}
@@ -251,7 +253,6 @@ struct dst_entry *sctp_v4_get_dst(union sctp_addr *daddr,
 	return &rt->u.dst;
 }
 
-
 /* Initialize a sctp_addr from in incoming skb.  */
 static void sctp_v4_from_skb(union sctp_addr *addr, struct sk_buff *skb,
 			     int is_saddr)
@@ -274,6 +275,21 @@ static void sctp_v4_from_skb(union sctp_addr *addr, struct sk_buff *skb,
 	memcpy(&addr->v4.sin_addr.s_addr, from, sizeof(struct in_addr));
 }
 
+/* Initialize an sctp_addr from a socket. */
+static void sctp_v4_from_sk(union sctp_addr *addr, struct sock *sk)
+{
+	addr->v4.sin_family = AF_INET;
+	addr->v4.sin_port = inet_sk(sk)->num;
+	addr->v4.sin_addr.s_addr = inet_sk(sk)->rcv_saddr;
+}
+
+/* Initialize sk->rcv_saddr from sctp_addr. */
+static void sctp_v4_to_sk(union sctp_addr *addr, struct sock *sk)
+{
+	inet_sk(sk)->rcv_saddr = addr->v4.sin_addr.s_addr;
+}
+
+
 /* Initialize a sctp_addr from a dst_entry. */
 static void sctp_v4_dst_saddr(union sctp_addr *saddr, struct dst_entry *dst)
 {
@@ -311,7 +327,7 @@ static int sctp_v4_is_any(const union sctp_addr *addr)
 }
 
 /* This function checks if the address is a valid address to be used for
- * SCTP.
+ * SCTP binding.
  *
  * Output:
  * Return 0 - If the address is a non-unicast or an illegal address.
@@ -326,6 +342,18 @@ static int sctp_v4_addr_valid(union sctp_addr *addr)
 	return 1;
 }
 
+/* Should this be available for binding?   */
+static int sctp_v4_available(const union sctp_addr *addr)
+{
+	int ret = inet_addr_type(addr->v4.sin_addr.s_addr);
+	
+	/* FIXME: ip_nonlocal_bind sysctl support. */
+
+	if (addr->v4.sin_addr.s_addr != INADDR_ANY && ret != RTN_LOCAL)
+		return 0;
+	return 1;
+}
+
 /* Checking the loopback, private and other address scopes as defined in
  * RFC 1918.   The IPv4 scoping is based on the draft for SCTP IPv4
  * scoping <draft-stewart-tsvwg-sctp-ipv4-00.txt>.
@@ -405,29 +433,42 @@ int sctp_ctl_sock_init(void)
 	return 0;
 }
 
-/* Get the table of functions for manipulating a particular address
- * family.
- */
-sctp_func_t *sctp_get_af_specific(sa_family_t family)
+/* Register address family specific functions. */
+int sctp_register_af(struct sctp_af *af)
 {
-	struct list_head *pos;
-	sctp_protocol_t *proto = sctp_get_protocol();
-	struct sctp_func *retval, *af;
+	switch (af->sa_family) {
+	case AF_INET:
+		if (sctp_af_v4_specific)
+			return 0;
+		sctp_af_v4_specific =  sctp_af_v4_specific = af;
+		break;
+	case AF_INET6:
+		if (sctp_af_v6_specific)
+			return 0;
+		sctp_af_v6_specific =  sctp_af_v6_specific = af;
+		break;
+	default:
+		return 0;
+	}
 
-	retval = NULL;
+	INIT_LIST_HEAD(&af->list);
+	list_add_tail(&af->list, &sctp_proto.address_families);
+	return 1;
+}
 
-	/* Cycle through all AF specific functions looking for a
-	 * match.
+/* Get the table of functions for manipulating a particular address
+ * family.
  */
-	list_for_each(pos, &proto->address_families) {
-		af = list_entry(pos, sctp_func_t, list);
-		if (family == af->sa_family) {
-			retval = af;
-			break;
-		}
+struct sctp_af *sctp_get_af_specific(sa_family_t family)
+{
+	switch (family) {
+	case AF_INET:
+		return sctp_af_v4_specific;
+	case AF_INET6:
+		return sctp_af_v6_specific;
+	default:
+		return NULL;
 	}
-
-	return retval;
 }
 
 /* Common code to initialize a AF_INET msg_name. */
@@ -495,18 +536,25 @@ static int sctp_inet_cmp_addr(const union sctp_addr *addr1,
 	return 0;
 }
 
+/* Verify that provided sockaddr looks bindable.  Common verification has
+ * already been taken care of.
+ */
+static int sctp_inet_bind_verify(struct sctp_opt *opt, union sctp_addr *addr)
+{
+	return sctp_v4_available(addr);
+}
 
-struct sctp_func sctp_ipv4_specific;
+struct sctp_af sctp_ipv4_specific;
 
-static sctp_pf_t sctp_pf_inet = {
+static struct sctp_pf sctp_pf_inet = {
 	.event_msgname = sctp_inet_event_msgname,
 	.skb_msgname   = sctp_inet_skb_msgname,
 	.af_supported  = sctp_inet_af_supported,
 	.cmp_addr      = sctp_inet_cmp_addr,
+	.bind_verify   = sctp_inet_bind_verify,
 	.af            = &sctp_ipv4_specific,
 };
 
-
 /* Registration for netdev events.  */
 struct notifier_block sctp_netdev_notifier = {
 	.notifier_call = sctp_netdev_event,
@@ -551,25 +599,28 @@ static struct inet_protocol sctp_protocol = {
 };
 
 /* IPv4 address related functions.  */
-struct sctp_func sctp_ipv4_specific = {
+struct sctp_af sctp_ipv4_specific = {
 	.queue_xmit     = ip_queue_xmit,
 	.setsockopt     = ip_setsockopt,
 	.getsockopt     = ip_getsockopt,
 	.get_dst	= sctp_v4_get_dst,
 	.copy_addrlist  = sctp_v4_copy_addrlist,
 	.from_skb       = sctp_v4_from_skb,
+	.from_sk        = sctp_v4_from_sk,
+	.to_sk          = sctp_v4_to_sk,
 	.dst_saddr      = sctp_v4_dst_saddr,
 	.cmp_addr       = sctp_v4_cmp_addr,
 	.addr_valid     = sctp_v4_addr_valid,
 	.inaddr_any     = sctp_v4_inaddr_any,
 	.is_any         = sctp_v4_is_any,
+	.available      = sctp_v4_available,
 	.scope          = sctp_v4_scope,
 	.net_header_len = sizeof(struct iphdr),
 	.sockaddr_len   = sizeof(struct sockaddr_in),
 	.sa_family      = AF_INET,
 };
 
-sctp_pf_t *sctp_get_pf_specific(int family) {
+struct sctp_pf *sctp_get_pf_specific(sa_family_t family) {
 
 	switch (family) {
 	case PF_INET:
@@ -581,20 +632,24 @@ sctp_pf_t *sctp_get_pf_specific(int family) {
 	}
 }
 
-/* Set the PF specific function table.  */
-void sctp_set_pf_specific(int family, sctp_pf_t *pf)
+/* Register the PF specific function table.  */
+int sctp_register_pf(struct sctp_pf *pf, sa_family_t family)
 {
 	switch (family) {
 	case PF_INET:
+		if (sctp_pf_inet_specific)
+			return 0;
 		sctp_pf_inet_specific = pf;
 		break;
 	case PF_INET6:
+		if (sctp_pf_inet6_specific)
+			return 0;
 		sctp_pf_inet6_specific = pf;
 		break;
 	default:
-		BUG();
-		break;
+		return 0;
 	}
+	return 1;
 }
 
 /* Initialize the universe into something sensible.  */
@@ -617,7 +672,7 @@ int sctp_init(void)
 	sctp_dbg_objcnt_init();
 
 	/* Initialize the SCTP specific PF functions. */
-	sctp_set_pf_specific(PF_INET, &sctp_pf_inet);
+	sctp_register_pf(&sctp_pf_inet, PF_INET);
 	/*
 	 * 14. Suggested SCTP Protocol Parameter Values
 	 */
@@ -709,8 +764,7 @@ int sctp_init(void)
 	sctp_sysctl_register();
 
 	INIT_LIST_HEAD(&sctp_proto.address_families);
-	INIT_LIST_HEAD(&sctp_ipv4_specific.list);
-	list_add_tail(&sctp_ipv4_specific.list, &sctp_proto.address_families);
+	sctp_register_af(&sctp_ipv4_specific);
 
 	status = sctp_v6_init();
 	if (status)

net/sctp/socket.c

@@ -87,12 +87,7 @@ static int sctp_wait_for_sndbuf(sctp_association_t *asoc, long *timeo_p,
 				int msg_len);
 static int sctp_wait_for_packet(struct sock * sk, int *err, long *timeo_p);
 static int sctp_wait_for_connect(sctp_association_t *asoc, long *timeo_p);
-static inline void sctp_sk_addr_set(struct sock *,
-				    const union sctp_addr *newaddr,
-				    union sctp_addr *saveaddr);
-static inline void sctp_sk_addr_restore(struct sock *,
-					const union sctp_addr *);
-static inline int sctp_verify_addr(struct sock *, struct sockaddr *, int);
+static inline int sctp_verify_addr(struct sock *, union sctp_addr *, int);
 static int sctp_bindx_add(struct sock *, struct sockaddr_storage *, int);
 static int sctp_bindx_rem(struct sock *, struct sockaddr_storage *, int);
 static int sctp_do_bind(struct sock *, union sctp_addr *, int);
@@ -133,101 +128,75 @@ int sctp_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len)
 	return retval;
 }
 
-static long sctp_get_port_local(struct sock *, unsigned short);
+static long sctp_get_port_local(struct sock *, union sctp_addr *);
 
-/* Bind a local address either to an endpoint or to an association.  */
-SCTP_STATIC int sctp_do_bind(struct sock *sk, union sctp_addr *newaddr,
-			     int addr_len)
+/* Verify this is a valid sockaddr. */
+static struct sctp_af *sctp_sockaddr_af(struct sctp_opt *opt, 
+					union sctp_addr *addr, int len)
 {
-	sctp_opt_t *sp = sctp_sk(sk);
-	sctp_endpoint_t *ep = sp->ep;
-	sctp_bind_addr_t *bp = &ep->base.bind_addr;
-	unsigned short sa_family = newaddr->sa.sa_family;
-	union sctp_addr tmpaddr, saveaddr;
-	unsigned short *snum;
-	int ret = 0;
+	struct sctp_af *af;
 
-	SCTP_DEBUG_PRINTK("sctp_do_bind(sk: %p, newaddr: %p, addr_len: %d)\n",
-			  sk, newaddr, addr_len);
+	/* Check minimum size.  */
+	if (len < sizeof (struct sockaddr))
+		return NULL;
 
-	/* FIXME: This function needs to handle v4-mapped-on-v6
-	 * addresses!
-	 */
-	if (PF_INET == sk->family) {
-		if (sa_family != AF_INET)
-			return -EINVAL;
-	}
+	/* Does this PF support this AF? */
+	if (!opt->pf->af_supported(addr->sa.sa_family))
+		return NULL;
 
-	/* Make a local copy of the new address.  */
-	tmpaddr = *newaddr;
+	/* If we get this far, af is valid. */
+	af = sctp_get_af_specific(addr->sa.sa_family);
 
-	switch (sa_family) {
-	case AF_INET:
-		if (addr_len < sizeof(struct sockaddr_in))
-			return -EINVAL;
+	if (len < af->sockaddr_len)
+		return NULL;
 
-		ret = inet_addr_type(newaddr->v4.sin_addr.s_addr);
+	return af;
+}
 
-		/* FIXME:
-		 * Should we allow apps to bind to non-local addresses by
-		 * checking the IP sysctl parameter "ip_nonlocal_bind"?
-		 */
-		if (newaddr->v4.sin_addr.s_addr != INADDR_ANY &&
-		    ret != RTN_LOCAL)
-			return -EADDRNOTAVAIL;
 
-		tmpaddr.v4.sin_port = htons(tmpaddr.v4.sin_port);
-		snum = &tmpaddr.v4.sin_port;
-		break;
+/* Bind a local address either to an endpoint or to an association.  */
+SCTP_STATIC int sctp_do_bind(struct sock *sk, union sctp_addr *addr, int len)
+{
+	sctp_opt_t *sp = sctp_sk(sk);
+	sctp_endpoint_t *ep = sp->ep;
+	sctp_bind_addr_t *bp = &ep->base.bind_addr;
+	struct sctp_af *af;
+	unsigned short snum;
+	int ret = 0;
 
-	case AF_INET6:
-		SCTP_V6(
-			/* FIXME: Hui, please verify this.   Looking at
-			 * the ipv6 code I see a SIN6_LEN_RFC2133 check.
-			 * I'm guessing that scope_id is a newer addition.
-			 */
-			if (addr_len < sizeof(struct sockaddr_in6))
+	SCTP_DEBUG_PRINTK("sctp_do_bind(sk: %p, newaddr: %p, len: %d)\n",
+			  sk, addr, len);
+
+	/* Common sockaddr verification. */
+	af = sctp_sockaddr_af(sp, addr, len);
+	if (!af)
 		return -EINVAL;
 
-			/* FIXME - The support for IPv6 multiple types
-			 * of addresses need to be added later.
-			 */
-			ret = sctp_ipv6_addr_type(&newaddr->v6.sin6_addr);
-			tmpaddr.v6.sin6_port = htons(tmpaddr.v6.sin6_port);
-			snum = &tmpaddr.v6.sin6_port;
-			break;
-		)
+	/* PF specific bind() address verification. */
+	if (!sp->pf->bind_verify(sp, addr))
+		return -EADDRNOTAVAIL;
 
-	default:
-		return -EINVAL;
-	};
+	snum= ntohs(addr->v4.sin_port);
 
 	SCTP_DEBUG_PRINTK("sctp_do_bind: port: %d, new port: %d\n",
-			  bp->port, *snum);
+			  bp->port, snum);
 
 	/* We must either be unbound, or bind to the same port.  */
-	if (bp->port && (*snum != bp->port)) {
+	if (bp->port && (snum != bp->port)) {
 		SCTP_DEBUG_PRINTK("sctp_do_bind:"
 				  " New port %d does not match existing port "
-				  "%d.\n", *snum, bp->port);
+				  "%d.\n", snum, bp->port);
 		return -EINVAL;
 	}
 
-	if (*snum && *snum < PROT_SOCK && !capable(CAP_NET_BIND_SERVICE))
+	if (snum && snum < PROT_SOCK && !capable(CAP_NET_BIND_SERVICE))
 		return -EACCES;
 
-	/* FIXME - Make socket understand that there might be multiple bind
-	 * addresses and there will be multiple source addresses involved in
-	 * routing and failover decisions.
-	 */
-	sctp_sk_addr_set(sk, &tmpaddr, &saveaddr);
-
 	/* Make sure we are allowed to bind here.
 	 * The function sctp_get_port_local() does duplicate address
 	 * detection.
 	 */
-	if ((ret = sctp_get_port_local(sk, *snum))) {
-		sctp_sk_addr_restore(sk, &saveaddr);
+	if ((ret = sctp_get_port_local(sk, addr))) {
 		if (ret == (long) sk) {
 			/* This endpoint has a conflicting address. */
 			return -EINVAL;
@@ -237,25 +206,32 @@ SCTP_STATIC int sctp_do_bind(struct sock *sk, union sctp_addr *newaddr,
 	}
 
 	/* Refresh ephemeral port.  */
-	if (!*snum)
-		*snum = inet_sk(sk)->num;
+	if (!snum)
+		snum = inet_sk(sk)->num;
+
+
 
-	/* The getsockname() API depends on 'sport' being set.  */
-	inet_sk(sk)->sport = htons(inet_sk(sk)->num);
 
 	/* Add the address to the bind address list.  */
 	sctp_local_bh_disable();
 	sctp_write_lock(&ep->base.addr_lock);
 
 	/* Use GFP_ATOMIC since BHs are disabled.  */
-	if ((ret = sctp_add_bind_addr(bp, &tmpaddr, GFP_ATOMIC))) {
-		sctp_sk_addr_restore(sk, &saveaddr);
-	} else if (!bp->port) {
-		bp->port = *snum;
-	}
+	addr->v4.sin_port = ntohs(addr->v4.sin_port);
+	ret = sctp_add_bind_addr(bp, addr, GFP_ATOMIC);
+	addr->v4.sin_port = htons(addr->v4.sin_port);
+	if (!ret && !bp->port)
+		bp->port = snum;
 
 	sctp_write_unlock(&ep->base.addr_lock);
 	sctp_local_bh_enable();
+
+	/* Copy back into socket for getsockname() use. */
+	if (!ret) {
+		inet_sk(sk)->sport = htons(inet_sk(sk)->num);
+		af->to_sk(addr, sk);
+	}
+
 	return ret;
 }
 
@@ -778,7 +754,7 @@ SCTP_STATIC int sctp_sendmsg(struct kiocb *iocb, struct sock *sk,
 	 * For a peeled-off socket, msg_name is ignored.
 	 */
 	if ((SCTP_SOCKET_UDP_HIGH_BANDWIDTH != sp->type) && msg->msg_name) {
-		err = sctp_verify_addr(sk, (struct sockaddr *)msg->msg_name,
+		err = sctp_verify_addr(sk, (union sctp_addr *)msg->msg_name, 
 				       msg->msg_namelen);
 		if (err)
 			return err;
@@ -1359,9 +1335,6 @@ SCTP_STATIC int sctp_setsockopt(struct sock *sk, int level, int optname,
 {
 	int retval = 0;
 	char *tmp;
-	sctp_protocol_t *proto = sctp_get_protocol();
-	struct list_head *pos;
-	sctp_func_t *af;
 
 	SCTP_DEBUG_PRINTK("sctp_setsockopt(sk: %p... optname: %d)\n",
 			  sk, optname);
@@ -1373,15 +1346,10 @@ SCTP_STATIC int sctp_setsockopt(struct sock *sk, int level, int optname,
 	 * are at all well-founded.
 	 */
 	if (level != SOL_SCTP) {
-		list_for_each(pos, &proto->address_families) {
-			af = list_entry(pos, sctp_func_t, list);
-
-			retval = af->setsockopt(sk, level, optname, optval,
-						optlen);
-			if (retval < 0)
+		struct sctp_af *af = sctp_sk(sk)->pf->af;
+		retval = af->setsockopt(sk, level, optname, optval, optlen);
 		goto out_nounlock;
 	}
-	}
 
 	sctp_lock_sock(sk);
 
@@ -1484,7 +1452,7 @@ SCTP_STATIC int sctp_connect(struct sock *sk, struct sockaddr *uaddr,
 		goto out_unlock;
 	}
 
-	err = sctp_verify_addr(sk, uaddr, addr_len);
+	err = sctp_verify_addr(sk, (union sctp_addr *)uaddr, addr_len);
 	if (err)
 		goto out_unlock;	
 
@@ -1942,9 +1910,6 @@ SCTP_STATIC int sctp_getsockopt(struct sock *sk, int level, int optname,
 				char *optval, int *optlen)
 {
 	int retval = 0;
-	sctp_protocol_t *proto = sctp_get_protocol();
-	sctp_func_t *af;
-	struct list_head *pos;
 	int len;
 
 	SCTP_DEBUG_PRINTK("sctp_getsockopt(sk: %p, ...)\n", sk);
@@ -1956,14 +1921,11 @@ SCTP_STATIC int sctp_getsockopt(struct sock *sk, int level, int optname,
 	 * are at all well-founded.
 	 */
 	if (level != SOL_SCTP) {
-		list_for_each(pos, &proto->address_families) {
-			af = list_entry(pos, sctp_func_t, list);
-			retval = af->getsockopt(sk, level, optname,
-						optval, optlen);
-			if (retval < 0)
+		struct sctp_af *af = sctp_sk(sk)->pf->af;
+
+		retval = af->getsockopt(sk, level, optname, optval, optlen);
 		return retval;
 	}
-	}
 
 	if (get_user(len, optlen))
 		return -EFAULT;
@@ -2030,13 +1992,18 @@ static void sctp_unhash(struct sock *sk)
  */
 static sctp_bind_bucket_t *sctp_bucket_create(sctp_bind_hashbucket_t *head,
 					      unsigned short snum);
-static long sctp_get_port_local(struct sock *sk, unsigned short snum)
+static long sctp_get_port_local(struct sock *sk, union sctp_addr *addr)
 {
 	sctp_bind_hashbucket_t *head; /* hash list */
 	sctp_bind_bucket_t *pp; /* hash list port iterator */
 	sctp_protocol_t *sctp = sctp_get_protocol();
+	unsigned short snum;
 	int ret;
 	
+	/* NOTE:  Remember to put this back to net order. */
+	addr->v4.sin_port = ntohs(addr->v4.sin_port);
+	snum = addr->v4.sin_port;
+
 	SCTP_DEBUG_PRINTK("sctp_get_port() begins, snum=%d\n", snum);
 
 	sctp_local_bh_disable();
@@ -2101,6 +2068,7 @@ static long sctp_get_port_local(struct sock *sk, unsigned short snum)
 		}
 	}
 
+	
 	if (pp != NULL && pp->sk != NULL) {
 		/* We had a port hash table hit - there is an
 		 * available port (pp != NULL) and it is being
@@ -2108,7 +2076,6 @@ static long sctp_get_port_local(struct sock *sk, unsigned short snum)
 		 * socket is going to be sk2.
 		 */
 		int sk_reuse = sk->reuse;
-		union sctp_addr tmpaddr;
 		struct sock *sk2 = pp->sk;
 
 		SCTP_DEBUG_PRINTK("sctp_get_port() found a "
@@ -2116,27 +2083,6 @@ static long sctp_get_port_local(struct sock *sk, unsigned short snum)
 		if (pp->fastreuse != 0 && sk->reuse != 0)
 			goto success;
 
-		/* FIXME - multiple addresses need to be supported
-		 * later.
-		 */
-		switch (sk->family) {
-		case PF_INET:
-			tmpaddr.v4.sin_family = AF_INET;
-			tmpaddr.v4.sin_port = snum;
-			tmpaddr.v4.sin_addr.s_addr = inet_sk(sk)->rcv_saddr;
-			break;
-
-		case PF_INET6:
-			SCTP_V6(tmpaddr.v6.sin6_family = AF_INET6;
-				tmpaddr.v6.sin6_port = snum;
-				tmpaddr.v6.sin6_addr = inet6_sk(sk)->rcv_saddr;
-			)
-			break;
-
-		default:
-			break;
-		};
-
 		/* Run through the list of sockets bound to the port
 		 * (pp->port) [via the pointers bind_next and
 		 * bind_pprev in the struct sock *sk2 (pp->sk)]. On each one,
@@ -2154,8 +2100,7 @@ static long sctp_get_port_local(struct sock *sk, unsigned short snum)
 			if (sk_reuse && sk2->reuse)
 				continue;
 			
-			if (sctp_bind_addr_match(&ep2->base.bind_addr, 
-						 &tmpaddr,
+			if (sctp_bind_addr_match(&ep2->base.bind_addr, addr,
 						 sctp_sk(sk)))
 				goto found;
 		}
@@ -2207,12 +2152,25 @@ static long sctp_get_port_local(struct sock *sk, unsigned short snum)
 	sctp_local_bh_enable();
 
 	SCTP_DEBUG_PRINTK("sctp_get_port() ends, ret=%d\n", ret);
+	addr->v4.sin_port = htons(addr->v4.sin_port);
 	return ret;
 }
 
+/* Assign a 'snum' port to the socket.  If snum == 0, an ephemeral
+ * port is requested.  
+ */
 static int sctp_get_port(struct sock *sk, unsigned short snum)
 {
-	long ret = sctp_get_port_local(sk, snum);
+	long ret;
+	union sctp_addr addr;
+	struct sctp_af *af = sctp_sk(sk)->pf->af;
+
+	/* Set up a dummy address struct from the sk. */
+	af->from_sk(&addr, sk);
+	addr.v4.sin_port = htons(snum);
+
+	/* Note: sk->num gets filled in if ephemeral port request. */
+	ret = sctp_get_port_local(sk, &addr);
 
 	return (ret ? 1 : 0);
 }
@@ -2413,7 +2371,7 @@ void sctp_put_port(struct sock *sk)
 static int sctp_autobind(struct sock *sk)
 {
 	union sctp_addr autoaddr;
-	struct sctp_func *af;
+	struct sctp_af *af;
 	unsigned short port;
 
 	/* Initialize a local sockaddr structure to INADDR_ANY. */
@@ -2537,58 +2495,6 @@ SCTP_STATIC int sctp_msghdr_parse(const struct msghdr *msg,
 	return 0;
 }
 
-/* Setup sk->rcv_saddr before calling get_port().  */
-static inline void sctp_sk_addr_set(struct sock *sk,
-				    const union sctp_addr *newaddr,
-				    union sctp_addr *saveaddr)
-{
-	struct inet_opt *inet = inet_sk(sk);
-
-	saveaddr->sa.sa_family = newaddr->sa.sa_family;
-
-	switch (newaddr->sa.sa_family) {
-	case AF_INET:
-		saveaddr->v4.sin_addr.s_addr = inet->rcv_saddr;
-		inet->rcv_saddr = inet->saddr = newaddr->v4.sin_addr.s_addr;
-		break;
-
-	case AF_INET6:
-		SCTP_V6({
-			struct ipv6_pinfo *np = inet6_sk(sk);
-
-			saveaddr->v6.sin6_addr = np->rcv_saddr;
-			np->rcv_saddr = np->saddr = newaddr->v6.sin6_addr;
-			break;
-		})
-
-	default:
-		break;
-	};
-}
-
-/* Restore sk->rcv_saddr after failing get_port().  */
-static inline void sctp_sk_addr_restore(struct sock *sk, const union sctp_addr *addr)
-{
-	struct inet_opt *inet = inet_sk(sk);
-
-	switch (addr->sa.sa_family) {
-	case AF_INET:
-		inet->rcv_saddr = inet->saddr = addr->v4.sin_addr.s_addr;
-		break;
-
-	case AF_INET6:
-		SCTP_V6({
-			struct ipv6_pinfo *np = inet6_sk(sk);
-
-			np->rcv_saddr = np->saddr = addr->v6.sin6_addr;
-			break;
-		})
-
-	default:
-		break;
-	};
-}
-
 /*
  * Wait for a packet..
  * Note: This function is the same function as in core/datagram.c
@@ -2711,27 +2617,15 @@ static struct sk_buff *sctp_skb_recv_datagram(struct sock *sk, int flags, int no
 }
 
 /* Verify that this is a valid address. */
-static int sctp_verify_addr(struct sock *sk, struct sockaddr *addr, int len)
+static int sctp_verify_addr(struct sock *sk, union sctp_addr *addr, int len)
 {
-	struct sctp_func *af;
-
-	/* Check minimum size.  */
-	if (len < sizeof (struct sockaddr))
-		return -EINVAL;
+	struct sctp_af *af;
 
-	/* Do we support this address family in general? */
-	af = sctp_get_af_specific(addr->sa_family);
+	/* Verify basic sockaddr. */
+	af = sctp_sockaddr_af(sctp_sk(sk), addr, len);
 	if (!af)
 		return -EINVAL;
 
-	/* Does this PF support this AF? */
-	if (!sctp_sk(sk)->pf->af_supported(addr->sa_family))
-		return -EINVAL;
-     
-	/* Verify the minimum for this AF sockaddr. */
-	if (len < af->sockaddr_len)
-		return -EINVAL;
-
 	/* Is this a valid SCTP address?  */
 	if (!af->addr_valid((union sctp_addr *)addr)) 
 		return -EINVAL;

net/sctp/transport.c

@@ -207,7 +207,7 @@ void sctp_transport_route(sctp_transport_t *transport, union sctp_addr *saddr,
 			  struct sctp_opt *opt)
 {
 	sctp_association_t *asoc = transport->asoc;
-	struct sctp_func *af = transport->af_specific;
+	struct sctp_af *af = transport->af_specific;
 	union sctp_addr *daddr = &transport->ipaddr;
 	sctp_bind_addr_t *bp;
 	rwlock_t *addr_lock;