1 files changed, 227 insertions, 112 deletions

diff --git a/net/sctp/endpointola.c b/net/sctp/endpointola.c
index 96984f7a2d6..9da76ba4d10 100644
--- a/net/sctp/endpointola.c
+++ b/net/sctp/endpointola.c
@@ -1,4 +1,4 @@
-/* SCTP kernel reference Implementation
+/* SCTP kernel implementation
  * Copyright (c) 1999-2000 Cisco, Inc.
  * Copyright (c) 1999-2001 Motorola, Inc.
  * Copyright (c) 2001-2002 International Business Machines, Corp.
@@ -6,37 +6,29 @@
  * Copyright (c) 2001 Nokia, Inc.
  * Copyright (c) 2001 La Monte H.P. Yarroll
  *
- * This file is part of the SCTP kernel reference Implementation
+ * This file is part of the SCTP kernel implementation
  *
  * This abstraction represents an SCTP endpoint.
  *
- * This file is part of the implementation of the add-IP extension,
- * based on <draft-ietf-tsvwg-addip-sctp-02.txt> June 29, 2001,
- * for the SCTP kernel reference Implementation.
- *
- * The SCTP reference implementation is free software;
+ * The SCTP 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
+ * The SCTP 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.
+ * along with GNU CC; see the file COPYING.  If not, see
+ * <http://www.gnu.org/licenses/>.
  *
  * 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
+ *    lksctp developers <linux-sctp@vger.kernel.org>
  *
  * Written or modified by:
  *    La Monte H.P. Yarroll <piggy@acm.org>
@@ -44,13 +36,9 @@
  *    Jon Grimm <jgrimm@austin.ibm.com>
  *    Daisy Chang <daisyc@us.ibm.com>
  *    Dajiang Zhang <dajiang.zhang@nokia.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/types.h>
-#include <linux/sched.h>
 #include <linux/slab.h>
 #include <linux/in.h>
 #include <linux/random.h>	/* get_random_bytes() */
@@ -61,7 +49,7 @@
 #include <net/sctp/sm.h>
 
 /* Forward declarations for internal helpers. */
-static void sctp_endpoint_bh_rcv(struct sctp_endpoint *ep);
+static void sctp_endpoint_bh_rcv(struct work_struct *work);
 
 /*
  * Initialize the base fields of the endpoint structure.
@@ -70,8 +58,56 @@ static struct sctp_endpoint *sctp_endpoint_init(struct sctp_endpoint *ep,
 						struct sock *sk,
 						gfp_t gfp)
 {
-	struct sctp_sock *sp = sctp_sk(sk);
-	memset(ep, 0, sizeof(struct sctp_endpoint));
+	struct net *net = sock_net(sk);
+	struct sctp_hmac_algo_param *auth_hmacs = NULL;
+	struct sctp_chunks_param *auth_chunks = NULL;
+	struct sctp_shared_key *null_key;
+	int err;
+
+	ep->digest = kzalloc(SCTP_SIGNATURE_SIZE, gfp);
+	if (!ep->digest)
+		return NULL;
+
+	ep->auth_enable = net->sctp.auth_enable;
+	if (ep->auth_enable) {
+		/* Allocate space for HMACS and CHUNKS authentication
+		 * variables.  There are arrays that we encode directly
+		 * into parameters to make the rest of the operations easier.
+		 */
+		auth_hmacs = kzalloc(sizeof(sctp_hmac_algo_param_t) +
+				sizeof(__u16) * SCTP_AUTH_NUM_HMACS, gfp);
+		if (!auth_hmacs)
+			goto nomem;
+
+		auth_chunks = kzalloc(sizeof(sctp_chunks_param_t) +
+					SCTP_NUM_CHUNK_TYPES, gfp);
+		if (!auth_chunks)
+			goto nomem;
+
+		/* Initialize the HMACS parameter.
+		 * SCTP-AUTH: Section 3.3
+		 *    Every endpoint supporting SCTP chunk authentication MUST
+		 *    support the HMAC based on the SHA-1 algorithm.
+		 */
+		auth_hmacs->param_hdr.type = SCTP_PARAM_HMAC_ALGO;
+		auth_hmacs->param_hdr.length =
+					htons(sizeof(sctp_paramhdr_t) + 2);
+		auth_hmacs->hmac_ids[0] = htons(SCTP_AUTH_HMAC_ID_SHA1);
+
+		/* Initialize the CHUNKS parameter */
+		auth_chunks->param_hdr.type = SCTP_PARAM_CHUNKS;
+		auth_chunks->param_hdr.length = htons(sizeof(sctp_paramhdr_t));
+
+		/* If the Add-IP functionality is enabled, we must
+		 * authenticate, ASCONF and ASCONF-ACK chunks
+		 */
+		if (net->sctp.addip_enable) {
+			auth_chunks->chunks[0] = SCTP_CID_ASCONF;
+			auth_chunks->chunks[1] = SCTP_CID_ASCONF_ACK;
+			auth_chunks->param_hdr.length =
+					htons(sizeof(sctp_paramhdr_t) + 2);
+		}
+	}
 
 	/* Initialize the base structure. */
 	/* What type of endpoint are we?  */
@@ -79,19 +115,16 @@ static struct sctp_endpoint *sctp_endpoint_init(struct sctp_endpoint *ep,
 
 	/* Initialize the basic object fields. */
 	atomic_set(&ep->base.refcnt, 1);
-	ep->base.dead = 0;
-	ep->base.malloced = 1;
+	ep->base.dead = false;
 
 	/* Create an input queue.  */
 	sctp_inq_init(&ep->base.inqueue);
 
 	/* Set its top-half handler */
-	sctp_inq_set_th_handler(&ep->base.inqueue,
-				(void (*)(void *))sctp_endpoint_bh_rcv, ep);
+	sctp_inq_set_th_handler(&ep->base.inqueue, sctp_endpoint_bh_rcv);
 
 	/* Initialize the bind addr area */
 	sctp_bind_addr_init(&ep->base.bind_addr, 0);
-	rwlock_init(&ep->base.addr_lock);
 
 	/* Remember who we are attached to.  */
 	ep->base.sk = sk;
@@ -100,39 +133,49 @@ static struct sctp_endpoint *sctp_endpoint_init(struct sctp_endpoint *ep,
 	/* Create the lists of associations.  */
 	INIT_LIST_HEAD(&ep->asocs);
 
-	/* Set up the base timeout information.  */
-	ep->timeouts[SCTP_EVENT_TIMEOUT_NONE] = 0;
-	ep->timeouts[SCTP_EVENT_TIMEOUT_T1_COOKIE] =
-		msecs_to_jiffies(sp->rtoinfo.srto_initial);
-	ep->timeouts[SCTP_EVENT_TIMEOUT_T1_INIT] =
-		msecs_to_jiffies(sp->rtoinfo.srto_initial);
-	ep->timeouts[SCTP_EVENT_TIMEOUT_T2_SHUTDOWN] =
-		msecs_to_jiffies(sp->rtoinfo.srto_initial);
-	ep->timeouts[SCTP_EVENT_TIMEOUT_T3_RTX] = 0;
-	ep->timeouts[SCTP_EVENT_TIMEOUT_T4_RTO] = 0;
-
-	/* sctpimpguide-05 Section 2.12.2
-	 * If the 'T5-shutdown-guard' timer is used, it SHOULD be set to the
-	 * recommended value of 5 times 'RTO.Max'.
-	 */
-        ep->timeouts[SCTP_EVENT_TIMEOUT_T5_SHUTDOWN_GUARD]
-		= 5 * msecs_to_jiffies(sp->rtoinfo.srto_max);
-
-	ep->timeouts[SCTP_EVENT_TIMEOUT_HEARTBEAT] = 0;
-	ep->timeouts[SCTP_EVENT_TIMEOUT_SACK] = sctp_sack_timeout;
-	ep->timeouts[SCTP_EVENT_TIMEOUT_AUTOCLOSE] = sp->autoclose * HZ;
-
 	/* Use SCTP specific send buffer space queues.  */
-	ep->sndbuf_policy = sctp_sndbuf_policy;
+	ep->sndbuf_policy = net->sctp.sndbuf_policy;
+
+	sk->sk_data_ready = sctp_data_ready;
 	sk->sk_write_space = sctp_write_space;
 	sock_set_flag(sk, SOCK_USE_WRITE_QUEUE);
 
+	/* Get the receive buffer policy for this endpoint */
+	ep->rcvbuf_policy = net->sctp.rcvbuf_policy;
+
 	/* Initialize the secret key used with cookie. */
-	get_random_bytes(&ep->secret_key[0], SCTP_SECRET_SIZE);
-	ep->last_key = ep->current_key = 0;
-	ep->key_changed_at = jiffies;
+	get_random_bytes(ep->secret_key, sizeof(ep->secret_key));
+
+	/* SCTP-AUTH extensions*/
+	INIT_LIST_HEAD(&ep->endpoint_shared_keys);
+	null_key = sctp_auth_shkey_create(0, gfp);
+	if (!null_key)
+		goto nomem;
+
+	list_add(&null_key->key_list, &ep->endpoint_shared_keys);
+
+	/* Allocate and initialize transorms arrays for supported HMACs. */
+	err = sctp_auth_init_hmacs(ep, gfp);
+	if (err)
+		goto nomem_hmacs;
+
+	/* Add the null key to the endpoint shared keys list and
+	 * set the hmcas and chunks pointers.
+	 */
+	ep->auth_hmacs_list = auth_hmacs;
+	ep->auth_chunk_list = auth_chunks;
 
 	return ep;
+
+nomem_hmacs:
+	sctp_auth_destroy_keys(&ep->endpoint_shared_keys);
+nomem:
+	/* Free all allocations */
+	kfree(auth_hmacs);
+	kfree(auth_chunks);
+	kfree(ep->digest);
+	return NULL;
+
 }
 
 /* Create a sctp_endpoint with all that boring stuff initialized.
@@ -143,12 +186,13 @@ struct sctp_endpoint *sctp_endpoint_new(struct sock *sk, gfp_t gfp)
 	struct sctp_endpoint *ep;
 
 	/* Build a local endpoint. */
-	ep = t_new(struct sctp_endpoint, gfp);
+	ep = kzalloc(sizeof(*ep), gfp);
 	if (!ep)
 		goto fail;
+
 	if (!sctp_endpoint_init(ep, sk, gfp))
 		goto fail_init;
-	ep->base.malloced = 1;
+
 	SCTP_DBG_OBJCNT_INC(ep);
 	return ep;
 
@@ -164,6 +208,13 @@ void sctp_endpoint_add_asoc(struct sctp_endpoint *ep,
 {
 	struct sock *sk = ep->base.sk;
 
+	/* If this is a temporary association, don't bother
+	 * since we'll be removing it shortly and don't
+	 * want anyone to find it anyway.
+	 */
+	if (asoc->temp)
+		return;
+
 	/* Now just add it to our list of asocs */
 	list_add_tail(&asoc->asocs, &ep->asocs);
 
@@ -177,40 +228,57 @@ void sctp_endpoint_add_asoc(struct sctp_endpoint *ep,
  */
 void sctp_endpoint_free(struct sctp_endpoint *ep)
 {
-	ep->base.dead = 1;
+	ep->base.dead = true;
+
+	ep->base.sk->sk_state = SCTP_SS_CLOSED;
+
+	/* Unlink this endpoint, so we can't find it again! */
+	sctp_unhash_endpoint(ep);
+
 	sctp_endpoint_put(ep);
 }
 
 /* Final destructor for endpoint.  */
 static void sctp_endpoint_destroy(struct sctp_endpoint *ep)
 {
-	SCTP_ASSERT(ep->base.dead, "Endpoint is not dead", return);
+	struct sock *sk;
 
-	ep->base.sk->sk_state = SCTP_SS_CLOSED;
+	if (unlikely(!ep->base.dead)) {
+		WARN(1, "Attempt to destroy undead endpoint %p!\n", ep);
+		return;
+	}
 
-	/* Unlink this endpoint, so we can't find it again! */
-	sctp_unhash_endpoint(ep);
+	/* Free the digest buffer */
+	kfree(ep->digest);
 
-	/* Free up the HMAC transform. */
-	sctp_crypto_free_tfm(sctp_sk(ep->base.sk)->hmac);
+	/* SCTP-AUTH: Free up AUTH releated data such as shared keys
+	 * chunks and hmacs arrays that were allocated
+	 */
+	sctp_auth_destroy_keys(&ep->endpoint_shared_keys);
+	kfree(ep->auth_hmacs_list);
+	kfree(ep->auth_chunk_list);
+
+	/* AUTH - Free any allocated HMAC transform containers */
+	sctp_auth_destroy_hmacs(ep->auth_hmacs);
 
 	/* Cleanup. */
 	sctp_inq_free(&ep->base.inqueue);
 	sctp_bind_addr_free(&ep->base.bind_addr);
 
-	/* Remove and free the port */
-	if (sctp_sk(ep->base.sk)->bind_hash)
-		sctp_put_port(ep->base.sk);
+	memset(ep->secret_key, 0, sizeof(ep->secret_key));
 
 	/* Give up our hold on the sock. */
-	if (ep->base.sk)
-		sock_put(ep->base.sk);
+	sk = ep->base.sk;
+	if (sk != NULL) {
+		/* Remove and free the port */
+		if (sctp_sk(sk)->bind_hash)
+			sctp_put_port(sk);
 
-	/* Finally, free up our memory. */
-	if (ep->base.malloced) {
-		kfree(ep);
-		SCTP_DBG_OBJCNT_DEC(ep);
+		sock_put(sk);
 	}
+
+	kfree(ep);
+	SCTP_DBG_OBJCNT_DEC(ep);
 }
 
 /* Hold a reference to an endpoint. */
@@ -230,23 +298,18 @@ void sctp_endpoint_put(struct sctp_endpoint *ep)
 
 /* Is this the endpoint we are looking for?  */
 struct sctp_endpoint *sctp_endpoint_is_match(struct sctp_endpoint *ep,
+					       struct net *net,
 					       const union sctp_addr *laddr)
 {
-	struct sctp_endpoint *retval;
+	struct sctp_endpoint *retval = NULL;
 
-	sctp_read_lock(&ep->base.addr_lock);
-	if (ep->base.bind_addr.port == laddr->v4.sin_port) {
+	if ((htons(ep->base.bind_addr.port) == laddr->v4.sin_port) &&
+	    net_eq(sock_net(ep->base.sk), net)) {
 		if (sctp_bind_addr_match(&ep->base.bind_addr, laddr,
-					 sctp_sk(ep->base.sk))) {
+					 sctp_sk(ep->base.sk)))
 			retval = ep;
-			goto out;
-		}
 	}
 
-	retval = NULL;
-
-out:
-	sctp_read_unlock(&ep->base.addr_lock);
 	return retval;
 }
 
@@ -259,26 +322,43 @@ static struct sctp_association *__sctp_endpoint_lookup_assoc(
 	const union sctp_addr *paddr,
 	struct sctp_transport **transport)
 {
+	struct sctp_association *asoc = NULL;
+	struct sctp_association *tmp;
+	struct sctp_transport *t = NULL;
+	struct sctp_hashbucket *head;
+	struct sctp_ep_common *epb;
+	int hash;
 	int rport;
-	struct sctp_association *asoc;
-	struct list_head *pos;
-
-	rport = paddr->v4.sin_port;
 
-	list_for_each(pos, &ep->asocs) {
-		asoc = list_entry(pos, struct sctp_association, asocs);
-		if (rport == asoc->peer.port) {
-			sctp_read_lock(&asoc->base.addr_lock);
-			*transport = sctp_assoc_lookup_paddr(asoc, paddr);
-			sctp_read_unlock(&asoc->base.addr_lock);
+	*transport = NULL;
 
-			if (*transport)
-				return asoc;
+	/* If the local port is not set, there can't be any associations
+	 * on this endpoint.
+	 */
+	if (!ep->base.bind_addr.port)
+		goto out;
+
+	rport = ntohs(paddr->v4.sin_port);
+
+	hash = sctp_assoc_hashfn(sock_net(ep->base.sk), ep->base.bind_addr.port,
+				 rport);
+	head = &sctp_assoc_hashtable[hash];
+	read_lock(&head->lock);
+	sctp_for_each_hentry(epb, &head->chain) {
+		tmp = sctp_assoc(epb);
+		if (tmp->ep != ep || rport != tmp->peer.port)
+			continue;
+
+		t = sctp_assoc_lookup_paddr(tmp, paddr);
+		if (t) {
+			asoc = tmp;
+			*transport = t;
+			break;
 		}
 	}
-
-	*transport = NULL;
-	return NULL;
+	read_unlock(&head->lock);
+out:
+	return asoc;
 }
 
 /* Lookup association on an endpoint based on a peer address.  BH-safe.  */
@@ -289,9 +369,9 @@ struct sctp_association *sctp_endpoint_lookup_assoc(
 {
 	struct sctp_association *asoc;
 
-	sctp_local_bh_disable();
+	local_bh_disable();
 	asoc = __sctp_endpoint_lookup_assoc(ep, paddr, transport);
-	sctp_local_bh_enable();
+	local_bh_enable();
 
 	return asoc;
 }
@@ -302,20 +382,18 @@ struct sctp_association *sctp_endpoint_lookup_assoc(
 int sctp_endpoint_is_peeled_off(struct sctp_endpoint *ep,
 				const union sctp_addr *paddr)
 {
-	struct list_head *pos;
 	struct sctp_sockaddr_entry *addr;
 	struct sctp_bind_addr *bp;
+	struct net *net = sock_net(ep->base.sk);
 
-	sctp_read_lock(&ep->base.addr_lock);
 	bp = &ep->base.bind_addr;
-	list_for_each(pos, &bp->address_list) {
-		addr = list_entry(pos, struct sctp_sockaddr_entry, list);
-		if (sctp_has_association(&addr->a, paddr)) {
-			sctp_read_unlock(&ep->base.addr_lock);
+	/* This function is called with the socket lock held,
+	 * so the address_list can not change.
+	 */
+	list_for_each_entry(addr, &bp->address_list, list) {
+		if (sctp_has_association(net, &addr->a, paddr))
 			return 1;
-		}
 	}
-	sctp_read_unlock(&ep->base.addr_lock);
 
 	return 0;
 }
@@ -323,16 +401,21 @@ int sctp_endpoint_is_peeled_off(struct sctp_endpoint *ep,
 /* Do delayed input processing.  This is scheduled by sctp_rcv().
  * This may be called on BH or task time.
  */
-static void sctp_endpoint_bh_rcv(struct sctp_endpoint *ep)
+static void sctp_endpoint_bh_rcv(struct work_struct *work)
 {
+	struct sctp_endpoint *ep =
+		container_of(work, struct sctp_endpoint,
+			     base.inqueue.immediate);
 	struct sctp_association *asoc;
 	struct sock *sk;
+	struct net *net;
 	struct sctp_transport *transport;
 	struct sctp_chunk *chunk;
 	struct sctp_inq *inqueue;
 	sctp_subtype_t subtype;
 	sctp_state_t state;
 	int error = 0;
+	int first_time = 1;	/* is this the first time through the loop */
 
 	if (ep->base.dead)
 		return;
@@ -340,10 +423,34 @@ static void sctp_endpoint_bh_rcv(struct sctp_endpoint *ep)
 	asoc = NULL;
 	inqueue = &ep->base.inqueue;
 	sk = ep->base.sk;
+	net = sock_net(sk);
 
 	while (NULL != (chunk = sctp_inq_pop(inqueue))) {
 		subtype = SCTP_ST_CHUNK(chunk->chunk_hdr->type);
 
+		/* If the first chunk in the packet is AUTH, do special
+		 * processing specified in Section 6.3 of SCTP-AUTH spec
+		 */
+		if (first_time && (subtype.chunk == SCTP_CID_AUTH)) {
+			struct sctp_chunkhdr *next_hdr;
+
+			next_hdr = sctp_inq_peek(inqueue);
+			if (!next_hdr)
+				goto normal;
+
+			/* If the next chunk is COOKIE-ECHO, skip the AUTH
+			 * chunk while saving a pointer to it so we can do
+			 * Authentication later (during cookie-echo
+			 * processing).
+			 */
+			if (next_hdr->type == SCTP_CID_COOKIE_ECHO) {
+				chunk->auth_chunk = skb_clone(chunk->skb,
+								GFP_ATOMIC);
+				chunk->auth = 1;
+				continue;
+			}
+		}
+normal:
 		/* We might have grown an association since last we
 		 * looked, so try again.
 		 *
@@ -359,20 +466,25 @@ static void sctp_endpoint_bh_rcv(struct sctp_endpoint *ep)
 		}
 
 		state = asoc ? asoc->state : SCTP_STATE_CLOSED;
+		if (sctp_auth_recv_cid(subtype.chunk, asoc) && !chunk->auth)
+			continue;
 
 		/* Remember where the last DATA chunk came from so we
 		 * know where to send the SACK.
 		 */
 		if (asoc && sctp_chunk_is_data(chunk))
 			asoc->peer.last_data_from = chunk->transport;
-		else
-			SCTP_INC_STATS(SCTP_MIB_INCTRLCHUNKS);
+		else {
+			SCTP_INC_STATS(sock_net(ep->base.sk), SCTP_MIB_INCTRLCHUNKS);
+			if (asoc)
+				asoc->stats.ictrlchunks++;
+		}
 
 		if (chunk->transport)
-			chunk->transport->last_time_heard = jiffies;
+			chunk->transport->last_time_heard = ktime_get();
 
-		error = sctp_do_sm(SCTP_EVENT_T_CHUNK, subtype, state,
-                                   ep, asoc, chunk, GFP_ATOMIC);
+		error = sctp_do_sm(net, SCTP_EVENT_T_CHUNK, subtype, state,
+				   ep, asoc, chunk, GFP_ATOMIC);
 
 		if (error && chunk)
 			chunk->pdiscard = 1;
@@ -382,5 +494,8 @@ static void sctp_endpoint_bh_rcv(struct sctp_endpoint *ep)
 		 */
 		if (!sctp_sk(sk)->ep)
 			break;
+
+		if (first_time)
+			first_time = 0;
 	}
 }