[SCTP] sctp_connectx() API support
Implements sctp_connectx() as defined in the SCTP sockets API draft by
tunneling the request through a setsockopt().
Signed-off-by: Frank Filz <ffilzlnx@us.ibm.com>
Signed-off-by: Sridhar Samudrala <sri@us.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/sctp/associola.c b/net/sctp/associola.c
index 663843d..7ae6aa7 100644
--- a/net/sctp/associola.c
+++ b/net/sctp/associola.c
@@ -191,10 +191,6 @@
asoc->last_cwr_tsn = asoc->ctsn_ack_point;
asoc->unack_data = 0;
- SCTP_DEBUG_PRINTK("myctsnap for %s INIT as 0x%x.\n",
- asoc->ep->debug_name,
- asoc->ctsn_ack_point);
-
/* ADDIP Section 4.1 Asconf Chunk Procedures
*
* When an endpoint has an ASCONF signaled change to be sent to the
@@ -211,6 +207,7 @@
/* Make an empty list of remote transport addresses. */
INIT_LIST_HEAD(&asoc->peer.transport_addr_list);
+ asoc->peer.transport_count = 0;
/* RFC 2960 5.1 Normal Establishment of an Association
*
@@ -288,6 +285,7 @@
asoc->base.malloced = 1;
SCTP_DBG_OBJCNT_INC(assoc);
+ SCTP_DEBUG_PRINTK("Created asoc %p\n", asoc);
return asoc;
@@ -356,6 +354,8 @@
sctp_transport_free(transport);
}
+ asoc->peer.transport_count = 0;
+
/* Free any cached ASCONF_ACK chunk. */
if (asoc->addip_last_asconf_ack)
sctp_chunk_free(asoc->addip_last_asconf_ack);
@@ -400,7 +400,7 @@
/* If the primary path is changing, assume that the
* user wants to use this new path.
*/
- if (transport->active)
+ if (transport->state != SCTP_INACTIVE)
asoc->peer.active_path = transport;
/*
@@ -428,10 +428,58 @@
transport->cacc.next_tsn_at_change = asoc->next_tsn;
}
+/* Remove a transport from an association. */
+void sctp_assoc_rm_peer(struct sctp_association *asoc,
+ struct sctp_transport *peer)
+{
+ struct list_head *pos;
+ struct sctp_transport *transport;
+
+ SCTP_DEBUG_PRINTK_IPADDR("sctp_assoc_rm_peer:association %p addr: ",
+ " port: %d\n",
+ asoc,
+ (&peer->ipaddr),
+ peer->ipaddr.v4.sin_port);
+
+ /* If we are to remove the current retran_path, update it
+ * to the next peer before removing this peer from the list.
+ */
+ if (asoc->peer.retran_path == peer)
+ sctp_assoc_update_retran_path(asoc);
+
+ /* Remove this peer from the list. */
+ list_del(&peer->transports);
+
+ /* Get the first transport of asoc. */
+ pos = asoc->peer.transport_addr_list.next;
+ transport = list_entry(pos, struct sctp_transport, transports);
+
+ /* Update any entries that match the peer to be deleted. */
+ if (asoc->peer.primary_path == peer)
+ sctp_assoc_set_primary(asoc, transport);
+ if (asoc->peer.active_path == peer)
+ asoc->peer.active_path = transport;
+ if (asoc->peer.last_data_from == peer)
+ asoc->peer.last_data_from = transport;
+
+ /* If we remove the transport an INIT was last sent to, set it to
+ * NULL. Combined with the update of the retran path above, this
+ * will cause the next INIT to be sent to the next available
+ * transport, maintaining the cycle.
+ */
+ if (asoc->init_last_sent_to == peer)
+ asoc->init_last_sent_to = NULL;
+
+ asoc->peer.transport_count--;
+
+ sctp_transport_free(peer);
+}
+
/* Add a transport address to an association. */
struct sctp_transport *sctp_assoc_add_peer(struct sctp_association *asoc,
const union sctp_addr *addr,
- int gfp)
+ const int gfp,
+ const int peer_state)
{
struct sctp_transport *peer;
struct sctp_sock *sp;
@@ -442,14 +490,25 @@
/* AF_INET and AF_INET6 share common port field. */
port = addr->v4.sin_port;
+ SCTP_DEBUG_PRINTK_IPADDR("sctp_assoc_add_peer:association %p addr: ",
+ " port: %d state:%s\n",
+ asoc,
+ addr,
+ addr->v4.sin_port,
+ peer_state == SCTP_UNKNOWN?"UNKNOWN":"ACTIVE");
+
/* Set the port if it has not been set yet. */
if (0 == asoc->peer.port)
asoc->peer.port = port;
/* Check to see if this is a duplicate. */
peer = sctp_assoc_lookup_paddr(asoc, addr);
- if (peer)
+ if (peer) {
+ if (peer_state == SCTP_ACTIVE &&
+ peer->state == SCTP_UNKNOWN)
+ peer->state = SCTP_ACTIVE;
return peer;
+ }
peer = sctp_transport_new(addr, gfp);
if (!peer)
@@ -516,8 +575,12 @@
/* Set the transport's RTO.initial value */
peer->rto = asoc->rto_initial;
+ /* Set the peer's active state. */
+ peer->state = peer_state;
+
/* Attach the remote transport to our asoc. */
list_add_tail(&peer->transports, &asoc->peer.transport_addr_list);
+ asoc->peer.transport_count++;
/* If we do not yet have a primary path, set one. */
if (!asoc->peer.primary_path) {
@@ -525,8 +588,9 @@
asoc->peer.retran_path = peer;
}
- if (asoc->peer.active_path == asoc->peer.retran_path)
+ if (asoc->peer.active_path == asoc->peer.retran_path) {
asoc->peer.retran_path = peer;
+ }
return peer;
}
@@ -537,37 +601,16 @@
{
struct list_head *pos;
struct list_head *temp;
- struct sctp_transport *peer = NULL;
struct sctp_transport *transport;
list_for_each_safe(pos, temp, &asoc->peer.transport_addr_list) {
transport = list_entry(pos, struct sctp_transport, transports);
if (sctp_cmp_addr_exact(addr, &transport->ipaddr)) {
- peer = transport;
- list_del(pos);
+ /* Do book keeping for removing the peer and free it. */
+ sctp_assoc_rm_peer(asoc, transport);
break;
}
}
-
- /* The address we want delete is not in the association. */
- if (!peer)
- return;
-
- /* Get the first transport of asoc. */
- pos = asoc->peer.transport_addr_list.next;
- transport = list_entry(pos, struct sctp_transport, transports);
-
- /* Update any entries that match the peer to be deleted. */
- if (asoc->peer.primary_path == peer)
- sctp_assoc_set_primary(asoc, transport);
- if (asoc->peer.active_path == peer)
- asoc->peer.active_path = transport;
- if (asoc->peer.retran_path == peer)
- asoc->peer.retran_path = transport;
- if (asoc->peer.last_data_from == peer)
- asoc->peer.last_data_from = transport;
-
- sctp_transport_free(peer);
}
/* Lookup a transport by address. */
@@ -608,12 +651,12 @@
/* Record the transition on the transport. */
switch (command) {
case SCTP_TRANSPORT_UP:
- transport->active = SCTP_ACTIVE;
+ transport->state = SCTP_ACTIVE;
spc_state = SCTP_ADDR_AVAILABLE;
break;
case SCTP_TRANSPORT_DOWN:
- transport->active = SCTP_INACTIVE;
+ transport->state = SCTP_INACTIVE;
spc_state = SCTP_ADDR_UNREACHABLE;
break;
@@ -643,7 +686,7 @@
list_for_each(pos, &asoc->peer.transport_addr_list) {
t = list_entry(pos, struct sctp_transport, transports);
- if (!t->active)
+ if (t->state == SCTP_INACTIVE)
continue;
if (!first || t->last_time_heard > first->last_time_heard) {
second = first;
@@ -663,7 +706,7 @@
* [If the primary is active but not most recent, bump the most
* recently used transport.]
*/
- if (asoc->peer.primary_path->active &&
+ if (asoc->peer.primary_path->state != SCTP_INACTIVE &&
first != asoc->peer.primary_path) {
second = first;
first = asoc->peer.primary_path;
@@ -958,7 +1001,7 @@
transports);
if (!sctp_assoc_lookup_paddr(asoc, &trans->ipaddr))
sctp_assoc_add_peer(asoc, &trans->ipaddr,
- GFP_ATOMIC);
+ GFP_ATOMIC, SCTP_ACTIVE);
}
asoc->ctsn_ack_point = asoc->next_tsn - 1;
@@ -998,7 +1041,7 @@
/* Try to find an active transport. */
- if (t->active) {
+ if (t->state != SCTP_INACTIVE) {
break;
} else {
/* Keep track of the next transport in case
@@ -1019,6 +1062,40 @@
}
asoc->peer.retran_path = t;
+
+ SCTP_DEBUG_PRINTK_IPADDR("sctp_assoc_update_retran_path:association"
+ " %p addr: ",
+ " port: %d\n",
+ asoc,
+ (&t->ipaddr),
+ t->ipaddr.v4.sin_port);
+}
+
+/* Choose the transport for sending a INIT packet. */
+struct sctp_transport *sctp_assoc_choose_init_transport(
+ struct sctp_association *asoc)
+{
+ struct sctp_transport *t;
+
+ /* Use the retran path. If the last INIT was sent over the
+ * retran path, update the retran path and use it.
+ */
+ if (!asoc->init_last_sent_to) {
+ t = asoc->peer.active_path;
+ } else {
+ if (asoc->init_last_sent_to == asoc->peer.retran_path)
+ sctp_assoc_update_retran_path(asoc);
+ t = asoc->peer.retran_path;
+ }
+
+ SCTP_DEBUG_PRINTK_IPADDR("sctp_assoc_update_retran_path:association"
+ " %p addr: ",
+ " port: %d\n",
+ asoc,
+ (&t->ipaddr),
+ t->ipaddr.v4.sin_port);
+
+ return t;
}
/* Choose the transport for sending a SHUTDOWN packet. */