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, 1240 insertions, 0 deletions

diff --git a/net/sctp/protocol.c b/net/sctp/protocol.c
new file mode 100644
index 000000000000..b9813cf3d91c
--- /dev/null
+++ b/net/sctp/protocol.c
@@ -0,0 +1,1240 @@
+/* SCTP kernel reference Implementation
+ * (C) Copyright IBM Corp. 2001, 2004
+ * Copyright (c) 1999-2000 Cisco, Inc.
+ * Copyright (c) 1999-2001 Motorola, Inc.
+ * Copyright (c) 2001 Intel Corp.
+ * Copyright (c) 2001 Nokia, Inc.
+ * Copyright (c) 2001 La Monte H.P. Yarroll
+ *
+ * This file is part of the SCTP kernel reference Implementation
+ *
+ * Initialization/cleanup for SCTP protocol support.
+ *
+ * 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:
+ *    La Monte H.P. Yarroll <piggy@acm.org>
+ *    Karl Knutson <karl@athena.chicago.il.us>
+ *    Jon Grimm <jgrimm@us.ibm.com>
+ *    Sridhar Samudrala <sri@us.ibm.com>
+ *    Daisy Chang <daisyc@us.ibm.com>
+ *    Ardelle Fan <ardelle.fan@intel.com>
+ *
+ * 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/init.h>
+#include <linux/netdevice.h>
+#include <linux/inetdevice.h>
+#include <linux/seq_file.h>
+#include <net/protocol.h>
+#include <net/ip.h>
+#include <net/ipv6.h>
+#include <net/sctp/sctp.h>
+#include <net/addrconf.h>
+#include <net/inet_common.h>
+#include <net/inet_ecn.h>
+
+/* Global data structures. */
+struct sctp_globals sctp_globals;
+struct proc_dir_entry   *proc_net_sctp;
+DEFINE_SNMP_STAT(struct sctp_mib, sctp_statistics);
+
+struct idr sctp_assocs_id;
+DEFINE_SPINLOCK(sctp_assocs_id_lock);
+
+/* This is the global socket data structure used for responding to
+ * the Out-of-the-blue (OOTB) packets.  A control sock will be created
+ * for this socket at the initialization time.
+ */
+static struct socket *sctp_ctl_socket;
+
+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;
+
+kmem_cache_t *sctp_chunk_cachep;
+kmem_cache_t *sctp_bucket_cachep;
+
+extern int sctp_snmp_proc_init(void);
+extern int sctp_snmp_proc_exit(void);
+extern int sctp_eps_proc_init(void);
+extern int sctp_eps_proc_exit(void);
+extern int sctp_assocs_proc_init(void);
+extern int sctp_assocs_proc_exit(void);
+
+/* Return the address of the control sock. */
+struct sock *sctp_get_ctl_sock(void)
+{
+        return sctp_ctl_socket->sk;
+}
+
+/* Set up the proc fs entry for the SCTP protocol. */
+static __init int sctp_proc_init(void)
+{
+        if (!proc_net_sctp) {
+                struct proc_dir_entry *ent;
+                ent = proc_mkdir("net/sctp", NULL);
+                if (ent) {
+                        ent->owner = THIS_MODULE;
+                        proc_net_sctp = ent;
+                } else
+                        goto out_nomem;
+        }
+
+        if (sctp_snmp_proc_init())
+                goto out_nomem; 
+        if (sctp_eps_proc_init())
+                goto out_nomem; 
+        if (sctp_assocs_proc_init())
+                goto out_nomem; 
+
+        return 0;
+
+out_nomem:
+        return -ENOMEM;
+}
+
+/* Clean up the proc fs entry for the SCTP protocol. 
+ * Note: Do not make this __exit as it is used in the init error
+ * path.
+ */
+static void sctp_proc_exit(void)
+{
+        sctp_snmp_proc_exit();
+        sctp_eps_proc_exit();
+        sctp_assocs_proc_exit();
+
+        if (proc_net_sctp) {
+                proc_net_sctp = NULL;
+                remove_proc_entry("net/sctp", NULL);
+        }
+}
+
+/* Private helper to extract ipv4 address and stash them in
+ * the protocol structure.
+ */
+static void sctp_v4_copy_addrlist(struct list_head *addrlist,
+                                  struct net_device *dev)
+{
+        struct in_device *in_dev;
+        struct in_ifaddr *ifa;
+        struct sctp_sockaddr_entry *addr;
+
+        rcu_read_lock();
+        if ((in_dev = __in_dev_get(dev)) == NULL) {
+                rcu_read_unlock();
+                return;
+        }
+
+        for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
+                /* Add the address to the local list.  */
+                addr = t_new(struct sctp_sockaddr_entry, GFP_ATOMIC);
+                if (addr) {
+                        addr->a.v4.sin_family = AF_INET;
+                        addr->a.v4.sin_port = 0;
+                        addr->a.v4.sin_addr.s_addr = ifa->ifa_local;
+                        list_add_tail(&addr->list, addrlist);
+                }
+        }
+
+        rcu_read_unlock();
+}
+
+/* Extract our IP addresses from the system and stash them in the
+ * protocol structure.
+ */
+static void __sctp_get_local_addr_list(void)
+{
+        struct net_device *dev;
+        struct list_head *pos;
+        struct sctp_af *af;
+
+        read_lock(&dev_base_lock);
+        for (dev = dev_base; dev; dev = dev->next) {
+                __list_for_each(pos, &sctp_address_families) {
+                        af = list_entry(pos, struct sctp_af, list);
+                        af->copy_addrlist(&sctp_local_addr_list, dev);
+                }
+        }
+        read_unlock(&dev_base_lock);
+}
+
+static void sctp_get_local_addr_list(void)
+{
+        unsigned long flags;
+
+        sctp_spin_lock_irqsave(&sctp_local_addr_lock, flags);
+        __sctp_get_local_addr_list();
+        sctp_spin_unlock_irqrestore(&sctp_local_addr_lock, flags);
+}
+
+/* Free the existing local addresses.  */
+static void __sctp_free_local_addr_list(void)
+{
+        struct sctp_sockaddr_entry *addr;
+        struct list_head *pos, *temp;
+
+        list_for_each_safe(pos, temp, &sctp_local_addr_list) {
+                addr = list_entry(pos, struct sctp_sockaddr_entry, list);
+                list_del(pos);
+                kfree(addr);
+        }
+}
+
+/* Free the existing local addresses.  */
+static void sctp_free_local_addr_list(void)
+{
+        unsigned long flags;
+
+        sctp_spin_lock_irqsave(&sctp_local_addr_lock, flags);
+        __sctp_free_local_addr_list();
+        sctp_spin_unlock_irqrestore(&sctp_local_addr_lock, flags);
+}
+
+/* Copy the local addresses which are valid for 'scope' into 'bp'.  */
+int sctp_copy_local_addr_list(struct sctp_bind_addr *bp, sctp_scope_t scope,
+                              int gfp, int copy_flags)
+{
+        struct sctp_sockaddr_entry *addr;
+        int error = 0;
+        struct list_head *pos;
+        unsigned long flags;
+
+        sctp_spin_lock_irqsave(&sctp_local_addr_lock, flags);
+        list_for_each(pos, &sctp_local_addr_list) {
+                addr = list_entry(pos, struct sctp_sockaddr_entry, list);
+                if (sctp_in_scope(&addr->a, scope)) {
+                        /* Now that the address is in scope, check to see if
+                         * the address type is really supported by the local
+                         * sock as well as the remote peer.
+                         */
+                        if ((((AF_INET == addr->a.sa.sa_family) &&
+                              (copy_flags & SCTP_ADDR4_PEERSUPP))) ||
+                            (((AF_INET6 == addr->a.sa.sa_family) &&
+                              (copy_flags & SCTP_ADDR6_ALLOWED) &&
+                              (copy_flags & SCTP_ADDR6_PEERSUPP)))) {
+                                error = sctp_add_bind_addr(bp, &addr->a, 
+                                                           GFP_ATOMIC);
+                                if (error)
+                                        goto end_copy;
+                        }
+                }
+        }
+
+end_copy:
+        sctp_spin_unlock_irqrestore(&sctp_local_addr_lock, flags);
+        return error;
+}
+
+/* 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)
+{
+        void *from;
+        __u16 *port;
+        struct sctphdr *sh;
+
+        port = &addr->v4.sin_port;
+        addr->v4.sin_family = AF_INET;
+
+        sh = (struct sctphdr *) skb->h.raw;
+        if (is_saddr) {
+                *port  = ntohs(sh->source);
+                from = &skb->nh.iph->saddr;
+        } else {
+                *port = ntohs(sh->dest);
+                from = &skb->nh.iph->daddr;
+        }
+        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->sk_rcv_saddr from sctp_addr. */
+static void sctp_v4_to_sk_saddr(union sctp_addr *addr, struct sock *sk)
+{
+        inet_sk(sk)->rcv_saddr = addr->v4.sin_addr.s_addr;
+}
+
+/* Initialize sk->sk_daddr from sctp_addr. */
+static void sctp_v4_to_sk_daddr(union sctp_addr *addr, struct sock *sk)
+{
+        inet_sk(sk)->daddr = addr->v4.sin_addr.s_addr;
+}
+
+/* Initialize a sctp_addr from an address parameter. */
+static void sctp_v4_from_addr_param(union sctp_addr *addr,
+                                    union sctp_addr_param *param,
+                                    __u16 port, int iif)
+{
+        addr->v4.sin_family = AF_INET;
+        addr->v4.sin_port = port;
+        addr->v4.sin_addr.s_addr = param->v4.addr.s_addr;
+}
+
+/* Initialize an address parameter from a sctp_addr and return the length
+ * of the address parameter.
+ */
+static int sctp_v4_to_addr_param(const union sctp_addr *addr,
+                                 union sctp_addr_param *param)
+{
+        int length = sizeof(sctp_ipv4addr_param_t);
+
+        param->v4.param_hdr.type = SCTP_PARAM_IPV4_ADDRESS;
+        param->v4.param_hdr.length = ntohs(length);
+        param->v4.addr.s_addr = addr->v4.sin_addr.s_addr;       
+
+        return length;
+}
+
+/* Initialize a sctp_addr from a dst_entry. */
+static void sctp_v4_dst_saddr(union sctp_addr *saddr, struct dst_entry *dst,
+                              unsigned short port)
+{
+        struct rtable *rt = (struct rtable *)dst;
+        saddr->v4.sin_family = AF_INET;
+        saddr->v4.sin_port = port;
+        saddr->v4.sin_addr.s_addr = rt->rt_src;
+}
+
+/* Compare two addresses exactly. */
+static int sctp_v4_cmp_addr(const union sctp_addr *addr1,
+                            const union sctp_addr *addr2)
+{
+        if (addr1->sa.sa_family != addr2->sa.sa_family)
+                return 0;
+        if (addr1->v4.sin_port != addr2->v4.sin_port)
+                return 0;
+        if (addr1->v4.sin_addr.s_addr != addr2->v4.sin_addr.s_addr)
+                return 0;
+
+        return 1;
+}
+
+/* Initialize addr struct to INADDR_ANY. */
+static void sctp_v4_inaddr_any(union sctp_addr *addr, unsigned short port)
+{
+        addr->v4.sin_family = AF_INET;
+        addr->v4.sin_addr.s_addr = INADDR_ANY;
+        addr->v4.sin_port = port;
+}
+
+/* Is this a wildcard address? */
+static int sctp_v4_is_any(const union sctp_addr *addr)
+{
+        return INADDR_ANY == addr->v4.sin_addr.s_addr;
+}
+
+/* This function checks if the address is a valid address to be used for
+ * SCTP binding.
+ *
+ * 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_v4_addr_valid(union sctp_addr *addr, struct sctp_sock *sp)
+{
+        /* Is this a non-unicast address or a unusable SCTP address? */
+        if (IS_IPV4_UNUSABLE_ADDRESS(&addr->v4.sin_addr.s_addr))
+                return 0;
+
+        return 1;
+}
+
+/* Should this be available for binding?   */
+static int sctp_v4_available(union sctp_addr *addr, struct sctp_sock *sp)
+{
+        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>.
+ *
+ * Level 0 - unusable SCTP addresses
+ * Level 1 - loopback address
+ * Level 2 - link-local addresses
+ * Level 3 - private addresses.
+ * Level 4 - global addresses
+ * For INIT and INIT-ACK address list, let L be the level of
+ * of requested destination address, sender and receiver
+ * SHOULD include all of its addresses with level greater
+ * than or equal to L.
+ */
+static sctp_scope_t sctp_v4_scope(union sctp_addr *addr)
+{
+        sctp_scope_t retval;
+
+        /* Should IPv4 scoping be a sysctl configurable option
+         * so users can turn it off (default on) for certain
+         * unconventional networking environments?
+         */
+
+        /* Check for unusable SCTP addresses. */
+        if (IS_IPV4_UNUSABLE_ADDRESS(&addr->v4.sin_addr.s_addr)) {
+                retval =  SCTP_SCOPE_UNUSABLE;
+        } else if (LOOPBACK(addr->v4.sin_addr.s_addr)) {
+                retval = SCTP_SCOPE_LOOPBACK;
+        } else if (IS_IPV4_LINK_ADDRESS(&addr->v4.sin_addr.s_addr)) {
+                retval = SCTP_SCOPE_LINK;
+        } else if (IS_IPV4_PRIVATE_ADDRESS(&addr->v4.sin_addr.s_addr)) {
+                retval = SCTP_SCOPE_PRIVATE;
+        } else {
+                retval = SCTP_SCOPE_GLOBAL;
+        }
+
+        return retval;
+}
+
+/* Returns a valid dst cache entry for the given source and destination ip
+ * addresses. If an association is passed, trys to get a dst entry with a
+ * source address that matches an address in the bind address list.
+ */
+static struct dst_entry *sctp_v4_get_dst(struct sctp_association *asoc,
+                                         union sctp_addr *daddr,
+                                         union sctp_addr *saddr)
+{
+        struct rtable *rt;
+        struct flowi fl;
+        struct sctp_bind_addr *bp;
+        rwlock_t *addr_lock;
+        struct sctp_sockaddr_entry *laddr;
+        struct list_head *pos;
+        struct dst_entry *dst = NULL;
+        union sctp_addr dst_saddr;
+
+        memset(&fl, 0x0, sizeof(struct flowi));
+        fl.fl4_dst  = daddr->v4.sin_addr.s_addr;
+        fl.proto = IPPROTO_SCTP;
+        if (asoc) {
+                fl.fl4_tos = RT_CONN_FLAGS(asoc->base.sk);
+                fl.oif = asoc->base.sk->sk_bound_dev_if;
+        }
+        if (saddr)
+                fl.fl4_src = saddr->v4.sin_addr.s_addr;
+
+        SCTP_DEBUG_PRINTK("%s: DST:%u.%u.%u.%u, SRC:%u.%u.%u.%u - ",
+                          __FUNCTION__, NIPQUAD(fl.fl4_dst),
+                          NIPQUAD(fl.fl4_src));
+
+        if (!ip_route_output_key(&rt, &fl)) {
+                dst = &rt->u.dst;
+        }
+
+        /* If there is no association or if a source address is passed, no
+         * more validation is required.
+         */
+        if (!asoc || saddr)
+                goto out;
+
+        bp = &asoc->base.bind_addr;
+        addr_lock = &asoc->base.addr_lock;
+
+        if (dst) {
+                /* Walk through the bind address list and look for a bind
+                 * address that matches the source address of the returned dst.
+                 */
+                sctp_read_lock(addr_lock);
+                list_for_each(pos, &bp->address_list) {
+                        laddr = list_entry(pos, struct sctp_sockaddr_entry,
+                                           list);
+                        sctp_v4_dst_saddr(&dst_saddr, dst, bp->port);
+                        if (sctp_v4_cmp_addr(&dst_saddr, &laddr->a))
+                                goto out_unlock;
+                }
+                sctp_read_unlock(addr_lock);
+
+                /* None of the bound addresses match the source address of the
+                 * dst. So release it.
+                 */
+                dst_release(dst);
+                dst = NULL;
+        }
+
+        /* Walk through the bind address list and try to get a dst that
+         * matches a bind address as the source address.
+         */
+        sctp_read_lock(addr_lock);
+        list_for_each(pos, &bp->address_list) {
+                laddr = list_entry(pos, struct sctp_sockaddr_entry, list);
+
+                if (AF_INET == laddr->a.sa.sa_family) {
+                        fl.fl4_src = laddr->a.v4.sin_addr.s_addr;
+                        if (!ip_route_output_key(&rt, &fl)) {
+                                dst = &rt->u.dst;
+                                goto out_unlock;
+                        }
+                }
+        }
+
+out_unlock:
+        sctp_read_unlock(addr_lock);
+out:
+        if (dst)
+                SCTP_DEBUG_PRINTK("rt_dst:%u.%u.%u.%u, rt_src:%u.%u.%u.%u\n",
+                                  NIPQUAD(rt->rt_dst), NIPQUAD(rt->rt_src));
+        else
+                SCTP_DEBUG_PRINTK("NO ROUTE\n");
+
+        return dst;
+}
+
+/* For v4, the source address is cached in the route entry(dst). So no need
+ * to cache it separately and hence this is an empty routine.
+ */
+static void sctp_v4_get_saddr(struct sctp_association *asoc,
+                              struct dst_entry *dst,
+                              union sctp_addr *daddr,
+                              union sctp_addr *saddr)
+{
+        struct rtable *rt = (struct rtable *)dst;
+
+        if (rt) {
+                saddr->v4.sin_family = AF_INET;
+                saddr->v4.sin_port = asoc->base.bind_addr.port;  
+                saddr->v4.sin_addr.s_addr = rt->rt_src; 
+        }
+}
+
+/* What interface did this skb arrive on? */
+static int sctp_v4_skb_iif(const struct sk_buff *skb)
+{
+        return ((struct rtable *)skb->dst)->rt_iif;
+}
+
+/* Was this packet marked by Explicit Congestion Notification? */
+static int sctp_v4_is_ce(const struct sk_buff *skb)
+{
+        return INET_ECN_is_ce(skb->nh.iph->tos);
+}
+
+/* Create and initialize a new sk for the socket returned by accept(). */
+static struct sock *sctp_v4_create_accept_sk(struct sock *sk,
+                                             struct sctp_association *asoc)
+{
+        struct inet_sock *inet = inet_sk(sk);
+        struct inet_sock *newinet;
+        struct sock *newsk = sk_alloc(PF_INET, GFP_KERNEL, sk->sk_prot, 1);
+
+        if (!newsk)
+                goto out;
+
+        sock_init_data(NULL, newsk);
+
+        newsk->sk_type = SOCK_STREAM;
+
+        newsk->sk_no_check = sk->sk_no_check;
+        newsk->sk_reuse = sk->sk_reuse;
+        newsk->sk_shutdown = sk->sk_shutdown;
+
+        newsk->sk_destruct = inet_sock_destruct;
+        newsk->sk_family = PF_INET;
+        newsk->sk_protocol = IPPROTO_SCTP;
+        newsk->sk_backlog_rcv = sk->sk_prot->backlog_rcv;
+        sock_reset_flag(newsk, SOCK_ZAPPED);
+
+        newinet = inet_sk(newsk);
+
+        /* Initialize sk's sport, dport, rcv_saddr and daddr for
+         * getsockname() and getpeername()
+         */
+        newinet->sport = inet->sport;
+        newinet->saddr = inet->saddr;
+        newinet->rcv_saddr = inet->rcv_saddr;
+        newinet->dport = htons(asoc->peer.port);
+        newinet->daddr = asoc->peer.primary_addr.v4.sin_addr.s_addr;
+        newinet->pmtudisc = inet->pmtudisc;
+        newinet->id = 0;
+
+        newinet->uc_ttl = -1;
+        newinet->mc_loop = 1;
+        newinet->mc_ttl = 1;
+        newinet->mc_index = 0;
+        newinet->mc_list = NULL;
+
+#ifdef INET_REFCNT_DEBUG
+        atomic_inc(&inet_sock_nr);
+#endif
+
+        if (newsk->sk_prot->init(newsk)) {
+                sk_common_release(newsk);
+                newsk = NULL;
+        }
+
+out:
+        return newsk;
+}
+
+/* Map address, empty for v4 family */
+static void sctp_v4_addr_v4map(struct sctp_sock *sp, union sctp_addr *addr)
+{
+        /* Empty */
+}
+
+/* Dump the v4 addr to the seq file. */
+static void sctp_v4_seq_dump_addr(struct seq_file *seq, union sctp_addr *addr)
+{
+        seq_printf(seq, "%d.%d.%d.%d ", NIPQUAD(addr->v4.sin_addr));
+}
+
+/* Event handler for inet address addition/deletion events.
+ * Basically, whenever there is an event, we re-build our local address list.
+ */
+int sctp_inetaddr_event(struct notifier_block *this, unsigned long ev,
+                        void *ptr)
+{
+        unsigned long flags;
+
+        sctp_spin_lock_irqsave(&sctp_local_addr_lock, flags);
+        __sctp_free_local_addr_list();
+        __sctp_get_local_addr_list();
+        sctp_spin_unlock_irqrestore(&sctp_local_addr_lock, flags);
+
+        return NOTIFY_DONE;
+}
+
+/*
+ * Initialize the control inode/socket with a control endpoint data
+ * structure.  This endpoint is reserved exclusively for the OOTB processing.
+ */
+static int sctp_ctl_sock_init(void)
+{
+        int err;
+        sa_family_t family;
+
+        if (sctp_get_pf_specific(PF_INET6))
+                family = PF_INET6;
+        else
+                family = PF_INET;
+
+        err = sock_create_kern(family, SOCK_SEQPACKET, IPPROTO_SCTP,
+                               &sctp_ctl_socket);
+        if (err < 0) {
+                printk(KERN_ERR
+                       "SCTP: Failed to create the SCTP control socket.\n");
+                return err;
+        }
+        sctp_ctl_socket->sk->sk_allocation = GFP_ATOMIC;
+        inet_sk(sctp_ctl_socket->sk)->uc_ttl = -1;
+
+        return 0;
+}
+
+/* Register address family specific functions. */
+int sctp_register_af(struct sctp_af *af)
+{
+        switch (af->sa_family) {
+        case AF_INET:
+                if (sctp_af_v4_specific)
+                        return 0;
+                sctp_af_v4_specific = af;
+                break;
+        case AF_INET6:
+                if (sctp_af_v6_specific)
+                        return 0;
+                sctp_af_v6_specific = af;
+                break;
+        default:
+                return 0;
+        }
+
+        INIT_LIST_HEAD(&af->list);
+        list_add_tail(&af->list, &sctp_address_families);
+        return 1;
+}
+
+/* Get the table of functions for manipulating a particular address
+ * family.
+ */
+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;
+        }
+}
+
+/* Common code to initialize a AF_INET msg_name. */
+static void sctp_inet_msgname(char *msgname, int *addr_len)
+{
+        struct sockaddr_in *sin;
+
+        sin = (struct sockaddr_in *)msgname;
+        *addr_len = sizeof(struct sockaddr_in);
+        sin->sin_family = AF_INET;
+        memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
+}
+
+/* Copy the primary address of the peer primary address as the msg_name. */
+static void sctp_inet_event_msgname(struct sctp_ulpevent *event, char *msgname,
+                                    int *addr_len)
+{
+        struct sockaddr_in *sin, *sinfrom;
+
+        if (msgname) {
+                struct sctp_association *asoc;
+
+                asoc = event->asoc;
+                sctp_inet_msgname(msgname, addr_len);
+                sin = (struct sockaddr_in *)msgname;
+                sinfrom = &asoc->peer.primary_addr.v4;
+                sin->sin_port = htons(asoc->peer.port);
+                sin->sin_addr.s_addr = sinfrom->sin_addr.s_addr;
+        }
+}
+
+/* Initialize and copy out a msgname from an inbound skb. */
+static void sctp_inet_skb_msgname(struct sk_buff *skb, char *msgname, int *len)
+{
+        struct sctphdr *sh;
+        struct sockaddr_in *sin;
+
+        if (msgname) {
+                sctp_inet_msgname(msgname, len);
+                sin = (struct sockaddr_in *)msgname;
+                sh = (struct sctphdr *)skb->h.raw;
+                sin->sin_port = sh->source;
+                sin->sin_addr.s_addr = skb->nh.iph->saddr;
+        }
+}
+
+/* Do we support this AF? */
+static int sctp_inet_af_supported(sa_family_t family, struct sctp_sock *sp)
+{
+        /* PF_INET only supports AF_INET addresses. */
+        return (AF_INET == family);
+}
+
+/* Address matching with wildcards allowed. */
+static int sctp_inet_cmp_addr(const union sctp_addr *addr1,
+                              const union sctp_addr *addr2,
+                              struct sctp_sock *opt)
+{
+        /* PF_INET only supports AF_INET addresses. */
+        if (addr1->sa.sa_family != addr2->sa.sa_family)
+                return 0;
+        if (INADDR_ANY == addr1->v4.sin_addr.s_addr ||
+            INADDR_ANY == addr2->v4.sin_addr.s_addr)
+                return 1;
+        if (addr1->v4.sin_addr.s_addr == addr2->v4.sin_addr.s_addr)
+                return 1;
+
+        return 0;
+}
+
+/* Verify that provided sockaddr looks bindable.  Common verification has
+ * already been taken care of.
+ */
+static int sctp_inet_bind_verify(struct sctp_sock *opt, union sctp_addr *addr)
+{
+        return sctp_v4_available(addr, opt);
+}
+
+/* Verify that sockaddr looks sendable.  Common verification has already
+ * been taken care of.
+ */
+static int sctp_inet_send_verify(struct sctp_sock *opt, union sctp_addr *addr)
+{
+        return 1;
+}
+
+/* Fill in Supported Address Type information for INIT and INIT-ACK
+ * chunks.  Returns number of addresses supported.
+ */
+static int sctp_inet_supported_addrs(const struct sctp_sock *opt,
+                                     __u16 *types)
+{
+        types[0] = SCTP_PARAM_IPV4_ADDRESS;
+        return 1;
+}
+
+/* Wrapper routine that calls the ip transmit routine. */
+static inline int sctp_v4_xmit(struct sk_buff *skb,
+                               struct sctp_transport *transport, int ipfragok)
+{
+        SCTP_DEBUG_PRINTK("%s: skb:%p, len:%d, "
+                          "src:%u.%u.%u.%u, dst:%u.%u.%u.%u\n",
+                          __FUNCTION__, skb, skb->len,
+                          NIPQUAD(((struct rtable *)skb->dst)->rt_src),
+                          NIPQUAD(((struct rtable *)skb->dst)->rt_dst));
+
+        SCTP_INC_STATS(SCTP_MIB_OUTSCTPPACKS);
+        return ip_queue_xmit(skb, ipfragok);
+}
+
+static struct sctp_af sctp_ipv4_specific;
+
+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,
+        .send_verify   = sctp_inet_send_verify,
+        .supported_addrs = sctp_inet_supported_addrs,
+        .create_accept_sk = sctp_v4_create_accept_sk,
+        .addr_v4map     = sctp_v4_addr_v4map,
+        .af            = &sctp_ipv4_specific,
+};
+
+/* Notifier for inetaddr addition/deletion events.  */
+static struct notifier_block sctp_inetaddr_notifier = {
+        .notifier_call = sctp_inetaddr_event,
+};
+
+/* Socket operations.  */
+static struct proto_ops inet_seqpacket_ops = {
+        .family      = PF_INET,
+        .owner       = THIS_MODULE,
+        .release     = inet_release,       /* Needs to be wrapped... */
+        .bind        = inet_bind,
+        .connect     = inet_dgram_connect,
+        .socketpair  = sock_no_socketpair,
+        .accept      = inet_accept,
+        .getname     = inet_getname,      /* Semantics are different.  */
+        .poll        = sctp_poll,
+        .ioctl       = inet_ioctl,
+        .listen      = sctp_inet_listen,
+        .shutdown    = inet_shutdown,     /* Looks harmless.  */
+        .setsockopt  = sock_common_setsockopt,   /* IP_SOL IP_OPTION is a problem. */
+        .getsockopt  = sock_common_getsockopt,
+        .sendmsg     = inet_sendmsg,
+        .recvmsg     = sock_common_recvmsg,
+        .mmap        = sock_no_mmap,
+        .sendpage    = sock_no_sendpage,
+};
+
+/* Registration with AF_INET family.  */
+static struct inet_protosw sctp_seqpacket_protosw = {
+        .type       = SOCK_SEQPACKET,
+        .protocol   = IPPROTO_SCTP,
+        .prot       = &sctp_prot,
+        .ops        = &inet_seqpacket_ops,
+        .capability = -1,
+        .no_check   = 0,
+        .flags      = SCTP_PROTOSW_FLAG
+};
+static struct inet_protosw sctp_stream_protosw = {
+        .type       = SOCK_STREAM,
+        .protocol   = IPPROTO_SCTP,
+        .prot       = &sctp_prot,
+        .ops        = &inet_seqpacket_ops,
+        .capability = -1,
+        .no_check   = 0,
+        .flags      = SCTP_PROTOSW_FLAG
+};
+
+/* Register with IP layer.  */
+static struct net_protocol sctp_protocol = {
+        .handler     = sctp_rcv,
+        .err_handler = sctp_v4_err,
+        .no_policy   = 1,
+};
+
+/* IPv4 address related functions.  */
+static struct sctp_af sctp_ipv4_specific = {
+        .sctp_xmit      = sctp_v4_xmit,
+        .setsockopt     = ip_setsockopt,
+        .getsockopt     = ip_getsockopt,
+        .get_dst        = sctp_v4_get_dst,
+        .get_saddr      = sctp_v4_get_saddr,
+        .copy_addrlist  = sctp_v4_copy_addrlist,
+        .from_skb       = sctp_v4_from_skb,
+        .from_sk        = sctp_v4_from_sk,
+        .to_sk_saddr    = sctp_v4_to_sk_saddr,
+        .to_sk_daddr    = sctp_v4_to_sk_daddr,
+        .from_addr_param= sctp_v4_from_addr_param,
+        .to_addr_param  = sctp_v4_to_addr_param,        
+        .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,
+        .skb_iif        = sctp_v4_skb_iif,
+        .is_ce          = sctp_v4_is_ce,
+        .seq_dump_addr  = sctp_v4_seq_dump_addr,
+        .net_header_len = sizeof(struct iphdr),
+        .sockaddr_len   = sizeof(struct sockaddr_in),
+        .sa_family      = AF_INET,
+};
+
+struct sctp_pf *sctp_get_pf_specific(sa_family_t family) {
+
+        switch (family) {
+        case PF_INET:
+                return sctp_pf_inet_specific;
+        case PF_INET6:
+                return sctp_pf_inet6_specific;
+        default:
+                return NULL;
+        }
+}
+
+/* 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:
+                return 0;
+        }
+        return 1;
+}
+
+static int __init init_sctp_mibs(void)
+{
+        sctp_statistics[0] = alloc_percpu(struct sctp_mib);
+        if (!sctp_statistics[0])
+                return -ENOMEM;
+        sctp_statistics[1] = alloc_percpu(struct sctp_mib);
+        if (!sctp_statistics[1]) {
+                free_percpu(sctp_statistics[0]);
+                return -ENOMEM;
+        }
+        return 0;
+
+}
+
+static void cleanup_sctp_mibs(void)
+{
+        free_percpu(sctp_statistics[0]);
+        free_percpu(sctp_statistics[1]);
+}
+
+/* Initialize the universe into something sensible.  */
+SCTP_STATIC __init int sctp_init(void)
+{
+        int i;
+        int status = -EINVAL;
+        unsigned long goal;
+        int order;
+
+        /* SCTP_DEBUG sanity check. */
+        if (!sctp_sanity_check())
+                goto out;
+
+        status = proto_register(&sctp_prot, 1);
+        if (status)
+                goto out;
+
+        /* Add SCTP to inet_protos hash table.  */
+        status = -EAGAIN;
+        if (inet_add_protocol(&sctp_protocol, IPPROTO_SCTP) < 0)
+                goto err_add_protocol;
+
+        /* Add SCTP(TCP and UDP style) to inetsw linked list.  */
+        inet_register_protosw(&sctp_seqpacket_protosw);
+        inet_register_protosw(&sctp_stream_protosw);
+
+        /* Allocate a cache pools. */
+        status = -ENOBUFS;
+        sctp_bucket_cachep = kmem_cache_create("sctp_bind_bucket",
+                                               sizeof(struct sctp_bind_bucket),
+                                               0, SLAB_HWCACHE_ALIGN,
+                                               NULL, NULL);
+
+        if (!sctp_bucket_cachep)
+                goto err_bucket_cachep;
+
+        sctp_chunk_cachep = kmem_cache_create("sctp_chunk",
+                                               sizeof(struct sctp_chunk),
+                                               0, SLAB_HWCACHE_ALIGN,
+                                               NULL, NULL);
+        if (!sctp_chunk_cachep)
+                goto err_chunk_cachep;
+
+        /* Allocate and initialise sctp mibs.  */
+        status = init_sctp_mibs();
+        if (status)
+                goto err_init_mibs;
+
+        /* Initialize proc fs directory.  */
+        status = sctp_proc_init();
+        if (status)
+                goto err_init_proc;
+
+        /* Initialize object count debugging.  */
+        sctp_dbg_objcnt_init();
+
+        /* Initialize the SCTP specific PF functions. */
+        sctp_register_pf(&sctp_pf_inet, PF_INET);
+        /*
+         * 14. Suggested SCTP Protocol Parameter Values
+         */
+        /* The following protocol parameters are RECOMMENDED:  */
+        /* RTO.Initial              - 3  seconds */
+        sctp_rto_initial                = SCTP_RTO_INITIAL;
+        /* RTO.Min                  - 1  second */
+        sctp_rto_min                    = SCTP_RTO_MIN;
+        /* RTO.Max                 -  60 seconds */
+        sctp_rto_max                    = SCTP_RTO_MAX;
+        /* RTO.Alpha                - 1/8 */
+        sctp_rto_alpha                  = SCTP_RTO_ALPHA;
+        /* RTO.Beta                 - 1/4 */
+        sctp_rto_beta                   = SCTP_RTO_BETA;
+
+        /* Valid.Cookie.Life        - 60  seconds */
+        sctp_valid_cookie_life          = 60 * HZ;
+
+        /* Whether Cookie Preservative is enabled(1) or not(0) */
+        sctp_cookie_preserve_enable     = 1;
+
+        /* Max.Burst                - 4 */
+        sctp_max_burst                  = SCTP_MAX_BURST;
+
+        /* Association.Max.Retrans  - 10 attempts
+         * Path.Max.Retrans         - 5  attempts (per destination address)
+         * Max.Init.Retransmits     - 8  attempts
+         */
+        sctp_max_retrans_association    = 10;
+        sctp_max_retrans_path           = 5;
+        sctp_max_retrans_init           = 8;
+
+        /* HB.interval              - 30 seconds */
+        sctp_hb_interval                = 30 * HZ;
+
+        /* Implementation specific variables. */
+
+        /* Initialize default stream count setup information. */
+        sctp_max_instreams              = SCTP_DEFAULT_INSTREAMS;
+        sctp_max_outstreams             = SCTP_DEFAULT_OUTSTREAMS;
+
+        /* Initialize handle used for association ids. */
+        idr_init(&sctp_assocs_id);
+
+        /* Size and allocate the association hash table.
+         * The methodology is similar to that of the tcp hash tables.
+         */
+        if (num_physpages >= (128 * 1024))
+                goal = num_physpages >> (22 - PAGE_SHIFT);
+        else
+                goal = num_physpages >> (24 - PAGE_SHIFT);
+
+        for (order = 0; (1UL << order) < goal; order++)
+                ;
+
+        do {
+                sctp_assoc_hashsize = (1UL << order) * PAGE_SIZE /
+                                        sizeof(struct sctp_hashbucket);
+                if ((sctp_assoc_hashsize > (64 * 1024)) && order > 0)
+                        continue;
+                sctp_assoc_hashtable = (struct sctp_hashbucket *)
+                                        __get_free_pages(GFP_ATOMIC, order);
+        } while (!sctp_assoc_hashtable && --order > 0);
+        if (!sctp_assoc_hashtable) {
+                printk(KERN_ERR "SCTP: Failed association hash alloc.\n");
+                status = -ENOMEM;
+                goto err_ahash_alloc;
+        }
+        for (i = 0; i < sctp_assoc_hashsize; i++) {
+                rwlock_init(&sctp_assoc_hashtable[i].lock);
+                sctp_assoc_hashtable[i].chain = NULL;
+        }
+
+        /* Allocate and initialize the endpoint hash table.  */
+        sctp_ep_hashsize = 64;
+        sctp_ep_hashtable = (struct sctp_hashbucket *)
+                kmalloc(64 * sizeof(struct sctp_hashbucket), GFP_KERNEL);
+        if (!sctp_ep_hashtable) {
+                printk(KERN_ERR "SCTP: Failed endpoint_hash alloc.\n");
+                status = -ENOMEM;
+                goto err_ehash_alloc;
+        }
+        for (i = 0; i < sctp_ep_hashsize; i++) {
+                rwlock_init(&sctp_ep_hashtable[i].lock);
+                sctp_ep_hashtable[i].chain = NULL;
+        }
+
+        /* Allocate and initialize the SCTP port hash table.  */
+        do {
+                sctp_port_hashsize = (1UL << order) * PAGE_SIZE /
+                                        sizeof(struct sctp_bind_hashbucket);
+                if ((sctp_port_hashsize > (64 * 1024)) && order > 0)
+                        continue;
+                sctp_port_hashtable = (struct sctp_bind_hashbucket *)
+                                        __get_free_pages(GFP_ATOMIC, order);
+        } while (!sctp_port_hashtable && --order > 0);
+        if (!sctp_port_hashtable) {
+                printk(KERN_ERR "SCTP: Failed bind hash alloc.");
+                status = -ENOMEM;
+                goto err_bhash_alloc;
+        }
+        for (i = 0; i < sctp_port_hashsize; i++) {
+                spin_lock_init(&sctp_port_hashtable[i].lock);
+                sctp_port_hashtable[i].chain = NULL;
+        }
+
+        spin_lock_init(&sctp_port_alloc_lock);
+        sctp_port_rover = sysctl_local_port_range[0] - 1;
+
+        printk(KERN_INFO "SCTP: Hash tables configured "
+                         "(established %d bind %d)\n",
+                sctp_assoc_hashsize, sctp_port_hashsize);
+
+        /* Disable ADDIP by default. */
+        sctp_addip_enable = 0;
+
+        /* Enable PR-SCTP by default. */
+        sctp_prsctp_enable = 1;
+
+        sctp_sysctl_register();
+
+        INIT_LIST_HEAD(&sctp_address_families);
+        sctp_register_af(&sctp_ipv4_specific);
+
+        status = sctp_v6_init();
+        if (status)
+                goto err_v6_init;
+
+        /* Initialize the control inode/socket for handling OOTB packets.  */
+        if ((status = sctp_ctl_sock_init())) {
+                printk (KERN_ERR
+                        "SCTP: Failed to initialize the SCTP control sock.\n");
+                goto err_ctl_sock_init;
+        }
+
+        /* Initialize the local address list. */
+        INIT_LIST_HEAD(&sctp_local_addr_list);
+        spin_lock_init(&sctp_local_addr_lock);
+
+        /* Register notifier for inet address additions/deletions. */
+        register_inetaddr_notifier(&sctp_inetaddr_notifier);
+
+        sctp_get_local_addr_list();
+
+        __unsafe(THIS_MODULE);
+        status = 0;
+out:
+        return status;
+err_add_protocol:
+        proto_unregister(&sctp_prot);
+err_ctl_sock_init:
+        sctp_v6_exit();
+err_v6_init:
+        sctp_sysctl_unregister();
+        list_del(&sctp_ipv4_specific.list);
+        free_pages((unsigned long)sctp_port_hashtable,
+                   get_order(sctp_port_hashsize *
+                             sizeof(struct sctp_bind_hashbucket)));
+err_bhash_alloc:
+        kfree(sctp_ep_hashtable);
+err_ehash_alloc:
+        free_pages((unsigned long)sctp_assoc_hashtable,
+                   get_order(sctp_assoc_hashsize *
+                             sizeof(struct sctp_hashbucket)));
+err_ahash_alloc:
+        sctp_dbg_objcnt_exit();
+err_init_proc:
+        sctp_proc_exit();
+        cleanup_sctp_mibs();
+err_init_mibs:
+        kmem_cache_destroy(sctp_chunk_cachep);
+err_chunk_cachep:
+        kmem_cache_destroy(sctp_bucket_cachep);
+err_bucket_cachep:
+        inet_del_protocol(&sctp_protocol, IPPROTO_SCTP);
+        inet_unregister_protosw(&sctp_seqpacket_protosw);
+        inet_unregister_protosw(&sctp_stream_protosw);
+        goto out;
+}
+
+/* Exit handler for the SCTP protocol.  */
+SCTP_STATIC __exit void sctp_exit(void)
+{
+        /* BUG.  This should probably do something useful like clean
+         * up all the remaining associations and all that memory.
+         */
+
+        /* Unregister notifier for inet address additions/deletions. */
+        unregister_inetaddr_notifier(&sctp_inetaddr_notifier);
+
+        /* Free the local address list.  */
+        sctp_free_local_addr_list();
+
+        /* Free the control endpoint.  */
+        sock_release(sctp_ctl_socket);
+
+        sctp_v6_exit();
+        sctp_sysctl_unregister();
+        list_del(&sctp_ipv4_specific.list);
+
+        free_pages((unsigned long)sctp_assoc_hashtable,
+                   get_order(sctp_assoc_hashsize *
+                             sizeof(struct sctp_hashbucket)));
+        kfree(sctp_ep_hashtable);
+        free_pages((unsigned long)sctp_port_hashtable,
+                   get_order(sctp_port_hashsize *
+                             sizeof(struct sctp_bind_hashbucket)));
+
+        kmem_cache_destroy(sctp_chunk_cachep);
+        kmem_cache_destroy(sctp_bucket_cachep);
+
+        sctp_dbg_objcnt_exit();
+        sctp_proc_exit();
+        cleanup_sctp_mibs();
+
+        inet_del_protocol(&sctp_protocol, IPPROTO_SCTP);
+        inet_unregister_protosw(&sctp_seqpacket_protosw);
+        inet_unregister_protosw(&sctp_stream_protosw);
+        proto_unregister(&sctp_prot);
+}
+
+module_init(sctp_init);
+module_exit(sctp_exit);
+
+MODULE_AUTHOR("Linux Kernel SCTP developers <lksctp-developers@lists.sourceforge.net>");
+MODULE_DESCRIPTION("Support for the SCTP protocol (RFC2960)");
+MODULE_LICENSE("GPL");