sctp: Add ASCONF operation on the single-homed host

In this case, the SCTP association transmits an ASCONF packet
including addition of the new IP address and deletion of the old
address.  This patch implements this functionality.
In this case, the ASCONF chunk is added to the beginning of the
queue, because the other chunks cannot be transmitted in this state.

Signed-off-by: Michio Honda <micchie@sfc.wide.ad.jp>
Signed-off-by: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
Acked-by: Wei Yongjun <yjwei@cn.fujitsu.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

6 files changed, 101 insertions, 7 deletions

diff --git a/include/net/sctp/structs.h b/include/net/sctp/structs.h
index cd8c929e6b0d..31d7ea2e1d2a 100644
--- a/include/net/sctp/structs.h
+++ b/include/net/sctp/structs.h
@@ -1913,6 +1913,8 @@ struct sctp_association {
 	 * after reaching 4294967295.
 	 */
 	__u32 addip_serial;
+	union sctp_addr *asconf_addr_del_pending;
+	int src_out_of_asoc_ok;
 
 	/* SCTP AUTH: list of the endpoint shared keys.  These
 	 * keys are provided out of band by the user applicaton
diff --git a/net/sctp/associola.c b/net/sctp/associola.c
index 4a62888f2e43..dc16b90ddb6f 100644
--- a/net/sctp/associola.c
+++ b/net/sctp/associola.c
@@ -280,6 +280,8 @@ static struct sctp_association *sctp_association_init(struct sctp_association *a
 	asoc->peer.asconf_capable = 0;
 	if (sctp_addip_noauth)
 		asoc->peer.asconf_capable = 1;
+	asoc->asconf_addr_del_pending = NULL;
+	asoc->src_out_of_asoc_ok = 0;
 
 	/* Create an input queue.  */
 	sctp_inq_init(&asoc->base.inqueue);
@@ -446,6 +448,10 @@ void sctp_association_free(struct sctp_association *asoc)
 
 	sctp_asconf_queue_teardown(asoc);
 
+	/* Free pending address space being deleted */
+	if (asoc->asconf_addr_del_pending != NULL)
+		kfree(asoc->asconf_addr_del_pending);
+
 	/* AUTH - Free the endpoint shared keys */
 	sctp_auth_destroy_keys(&asoc->endpoint_shared_keys);
 
diff --git a/net/sctp/outqueue.c b/net/sctp/outqueue.c
index 1c88c8911dc5..edc753297a49 100644
--- a/net/sctp/outqueue.c
+++ b/net/sctp/outqueue.c
@@ -754,6 +754,16 @@ static int sctp_outq_flush(struct sctp_outq *q, int rtx_timeout)
 	 */
 
 	list_for_each_entry_safe(chunk, tmp, &q->control_chunk_list, list) {
+		/* RFC 5061, 5.3
+		 * F1) This means that until such time as the ASCONF
+		 * containing the add is acknowledged, the sender MUST
+		 * NOT use the new IP address as a source for ANY SCTP
+		 * packet except on carrying an ASCONF Chunk.
+		 */
+		if (asoc->src_out_of_asoc_ok &&
+		    chunk->chunk_hdr->type != SCTP_CID_ASCONF)
+			continue;
+
 		list_del_init(&chunk->list);
 
 		/* Pick the right transport to use. */
@@ -881,6 +891,9 @@ static int sctp_outq_flush(struct sctp_outq *q, int rtx_timeout)
 		}
 	}
 
+	if (q->asoc->src_out_of_asoc_ok)
+		goto sctp_flush_out;
+
 	/* Is it OK to send data chunks?  */
 	switch (asoc->state) {
 	case SCTP_STATE_COOKIE_ECHOED:
diff --git a/net/sctp/protocol.c b/net/sctp/protocol.c
index 013c6136c546..af0a6b0fc9b6 100644
--- a/net/sctp/protocol.c
+++ b/net/sctp/protocol.c
@@ -503,7 +503,9 @@ static void sctp_v4_get_dst(struct sctp_transport *t, union sctp_addr *saddr,
 		sctp_v4_dst_saddr(&dst_saddr, fl4, htons(bp->port));
 		rcu_read_lock();
 		list_for_each_entry_rcu(laddr, &bp->address_list, list) {
-			if (!laddr->valid || (laddr->state != SCTP_ADDR_SRC))
+			if (!laddr->valid || (laddr->state == SCTP_ADDR_DEL) ||
+			    (laddr->state != SCTP_ADDR_SRC &&
+			    !asoc->src_out_of_asoc_ok))
 				continue;
 			if (sctp_v4_cmp_addr(&dst_saddr, &laddr->a))
 				goto out_unlock;
diff --git a/net/sctp/sm_make_chunk.c b/net/sctp/sm_make_chunk.c
index 37406039820f..3363d3788259 100644
--- a/net/sctp/sm_make_chunk.c
+++ b/net/sctp/sm_make_chunk.c
@@ -2768,6 +2768,7 @@ struct sctp_chunk *sctp_make_asconf_update_ip(struct sctp_association *asoc,
 	int			addr_param_len = 0;
 	int 			totallen = 0;
 	int 			i;
+	int			del_pickup = 0;
 
 	/* Get total length of all the address parameters. */
 	addr_buf = addrs;
@@ -2780,6 +2781,13 @@ struct sctp_chunk *sctp_make_asconf_update_ip(struct sctp_association *asoc,
 		totallen += addr_param_len;
 
 		addr_buf += af->sockaddr_len;
+		if (asoc->asconf_addr_del_pending && !del_pickup) {
+			/* reuse the parameter length from the same scope one */
+			totallen += paramlen;
+			totallen += addr_param_len;
+			del_pickup = 1;
+			SCTP_DEBUG_PRINTK("mkasconf_update_ip: picked same-scope del_pending addr, totallen for all addresses is %d\n", totallen);
+		}
 	}
 
 	/* Create an asconf chunk with the required length. */
@@ -2802,6 +2810,17 @@ struct sctp_chunk *sctp_make_asconf_update_ip(struct sctp_association *asoc,
 
 		addr_buf += af->sockaddr_len;
 	}
+	if (flags == SCTP_PARAM_ADD_IP && del_pickup) {
+		addr = asoc->asconf_addr_del_pending;
+		af = sctp_get_af_specific(addr->v4.sin_family);
+		addr_param_len = af->to_addr_param(addr, &addr_param);
+		param.param_hdr.type = SCTP_PARAM_DEL_IP;
+		param.param_hdr.length = htons(paramlen + addr_param_len);
+		param.crr_id = i;
+
+		sctp_addto_chunk(retval, paramlen, &param);
+		sctp_addto_chunk(retval, addr_param_len, &addr_param);
+	}
 	return retval;
 }
 
@@ -3224,6 +3243,11 @@ static void sctp_asconf_param_success(struct sctp_association *asoc,
 	case SCTP_PARAM_DEL_IP:
 		local_bh_disable();
 		sctp_del_bind_addr(bp, &addr);
+		if (asoc->asconf_addr_del_pending != NULL &&
+		    sctp_cmp_addr_exact(asoc->asconf_addr_del_pending, &addr)) {
+			kfree(asoc->asconf_addr_del_pending);
+			asoc->asconf_addr_del_pending = NULL;
+		}
 		local_bh_enable();
 		list_for_each_entry(transport, &asoc->peer.transport_addr_list,
 				transports) {
@@ -3381,6 +3405,9 @@ int sctp_process_asconf_ack(struct sctp_association *asoc,
 		asconf_len -= length;
 	}
 
+	if (no_err && asoc->src_out_of_asoc_ok)
+		asoc->src_out_of_asoc_ok = 0;
+
 	/* Free the cached last sent asconf chunk. */
 	list_del_init(&asconf->transmitted_list);
 	sctp_chunk_free(asconf);
diff --git a/net/sctp/socket.c b/net/sctp/socket.c
index cc06198dc444..e7e1b142875c 100644
--- a/net/sctp/socket.c
+++ b/net/sctp/socket.c
@@ -583,10 +583,6 @@ static int sctp_send_asconf_add_ip(struct sock		*sk,
 			goto out;
 		}
 
-		retval = sctp_send_asconf(asoc, chunk);
-		if (retval)
-			goto out;
-
 		/* Add the new addresses to the bind address list with
 		 * use_as_src set to 0.
 		 */
@@ -599,6 +595,23 @@ static int sctp_send_asconf_add_ip(struct sock		*sk,
 						    SCTP_ADDR_NEW, GFP_ATOMIC);
 			addr_buf += af->sockaddr_len;
 		}
+		if (asoc->src_out_of_asoc_ok) {
+			struct sctp_transport *trans;
+
+			list_for_each_entry(trans,
+			    &asoc->peer.transport_addr_list, transports) {
+				/* Clear the source and route cache */
+				dst_release(trans->dst);
+				trans->cwnd = min(4*asoc->pathmtu, max_t(__u32,
+				    2*asoc->pathmtu, 4380));
+				trans->ssthresh = asoc->peer.i.a_rwnd;
+				trans->rto = asoc->rto_initial;
+				trans->rtt = trans->srtt = trans->rttvar = 0;
+				sctp_transport_route(trans, NULL,
+				    sctp_sk(asoc->base.sk));
+			}
+		}
+		retval = sctp_send_asconf(asoc, chunk);
 	}
 
 out:
@@ -715,7 +728,9 @@ static int sctp_send_asconf_del_ip(struct sock		*sk,
 	struct sctp_sockaddr_entry *saddr;
 	int 			i;
 	int 			retval = 0;
+	int			stored = 0;
 
+	chunk = NULL;
 	if (!sctp_addip_enable)
 		return retval;
 
@@ -766,8 +781,33 @@ static int sctp_send_asconf_del_ip(struct sock		*sk,
 		bp = &asoc->base.bind_addr;
 		laddr = sctp_find_unmatch_addr(bp, (union sctp_addr *)addrs,
 					       addrcnt, sp);
-		if (!laddr)
-			continue;
+		if ((laddr == NULL) && (addrcnt == 1)) {
+			if (asoc->asconf_addr_del_pending)
+				continue;
+			asoc->asconf_addr_del_pending =
+			    kzalloc(sizeof(union sctp_addr), GFP_ATOMIC);
+			asoc->asconf_addr_del_pending->sa.sa_family =
+				    addrs->sa_family;
+			asoc->asconf_addr_del_pending->v4.sin_port =
+				    htons(bp->port);
+			if (addrs->sa_family == AF_INET) {
+				struct sockaddr_in *sin;
+
+				sin = (struct sockaddr_in *)addrs;
+				asoc->asconf_addr_del_pending->v4.sin_addr.s_addr = sin->sin_addr.s_addr;
+			} else if (addrs->sa_family == AF_INET6) {
+				struct sockaddr_in6 *sin6;
+
+				sin6 = (struct sockaddr_in6 *)addrs;
+				ipv6_addr_copy(&asoc->asconf_addr_del_pending->v6.sin6_addr, &sin6->sin6_addr);
+			}
+			SCTP_DEBUG_PRINTK_IPADDR("send_asconf_del_ip: keep the last address asoc: %p ",
+			    " at %p\n", asoc, asoc->asconf_addr_del_pending,
+			    asoc->asconf_addr_del_pending);
+			asoc->src_out_of_asoc_ok = 1;
+			stored = 1;
+			goto skip_mkasconf;
+		}
 
 		/* We do not need RCU protection throughout this loop
 		 * because this is done under a socket lock from the
@@ -780,6 +820,7 @@ static int sctp_send_asconf_del_ip(struct sock		*sk,
 			goto out;
 		}
 
+skip_mkasconf:
 		/* Reset use_as_src flag for the addresses in the bind address
 		 * list that are to be deleted.
 		 */
@@ -805,6 +846,9 @@ static int sctp_send_asconf_del_ip(struct sock		*sk,
 					     sctp_sk(asoc->base.sk));
 		}
 
+		if (stored)
+			/* We don't need to transmit ASCONF */
+			continue;
 		retval = sctp_send_asconf(asoc, chunk);
 	}
 out: