aboutsummaryrefslogtreecommitdiff
path: root/net/sctp/protocol.c
diff options
context:
space:
mode:
Diffstat (limited to 'net/sctp/protocol.c')
-rw-r--r--net/sctp/protocol.c1240
1 files changed, 1240 insertions, 0 deletions
diff --git a/net/sctp/protocol.c b/net/sctp/protocol.c
new file mode 100644
index 00000000000..b9813cf3d91
--- /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");