[SCTP]: Update SCTP_PEER_ADDR_PARAMS socket option to the latest api draft.

This patch adds support to set/get heartbeat interval, maximum number of
retransmissions, pathmtu, sackdelay time for a particular transport/
association/socket as per the latest SCTP sockets api draft11.

Signed-off-by: Frank Filz <ffilz@us.ibm.com>
Signed-off-by: Sridhar Samudrala <sri@us.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 22 insertions, 4 deletions

diff --git a/net/sctp/sm_sideeffect.c b/net/sctp/sm_sideeffect.c
index 823947170a33..2d7d8a5db2ac 100644
--- a/net/sctp/sm_sideeffect.c
+++ b/net/sctp/sm_sideeffect.c
@@ -157,9 +157,12 @@ static int sctp_gen_sack(struct sctp_association *asoc, int force,
 {
         __u32 ctsn, max_tsn_seen;
         struct sctp_chunk *sack;
+        struct sctp_transport *trans = asoc->peer.last_data_from;
         int error = 0;
 
-        if (force)
+        if (force || 
+            (!trans && (asoc->param_flags & SPP_SACKDELAY_DISABLE)) ||
+            (trans && (trans->param_flags & SPP_SACKDELAY_DISABLE)))
                 asoc->peer.sack_needed = 1;
 
         ctsn = sctp_tsnmap_get_ctsn(&asoc->peer.tsn_map);
@@ -189,7 +192,22 @@ static int sctp_gen_sack(struct sctp_association *asoc, int force,
         if (!asoc->peer.sack_needed) {
                 /* We will need a SACK for the next packet.  */
                 asoc->peer.sack_needed = 1;
-                goto out;
+
+                /* Set the SACK delay timeout based on the
+                 * SACK delay for the last transport
+                 * data was received from, or the default
+                 * for the association.
+                 */
+                if (trans)
+                        asoc->timeouts[SCTP_EVENT_TIMEOUT_SACK] = 
+                                trans->sackdelay;
+                else
+                        asoc->timeouts[SCTP_EVENT_TIMEOUT_SACK] = 
+                                asoc->sackdelay;
+
+                /* Restart the SACK timer. */
+                sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_RESTART,
+                                SCTP_TO(SCTP_EVENT_TIMEOUT_SACK));
         } else {
                 if (asoc->a_rwnd > asoc->rwnd)
                         asoc->a_rwnd = asoc->rwnd;
@@ -205,7 +223,7 @@ static int sctp_gen_sack(struct sctp_association *asoc, int force,
                 sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_STOP,
                                 SCTP_TO(SCTP_EVENT_TIMEOUT_SACK));
         }
-out:
+
         return error;
 nomem:
         error = -ENOMEM;
@@ -415,7 +433,7 @@ static void sctp_do_8_2_transport_strike(struct sctp_association *asoc,
         asoc->overall_error_count++;
 
         if (transport->state != SCTP_INACTIVE &&
-            (transport->error_count++ >= transport->max_retrans)) {
+            (transport->error_count++ >= transport->pathmaxrxt)) {
                 SCTP_DEBUG_PRINTK_IPADDR("transport_strike:association %p",
                                          " transport IP: port:%d failed.\n",
                                          asoc,