[SCTP]: Honor flags when setting peer address parameters

Parameters only take effect when a corresponding flag bit is set
and a value is specified. This means we need to check the flags
in addition to checking for non-zero value.

Signed-off-by: Vlad Yasevich <vladislav.yasevich@hp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/include/net/sctp/user.h b/include/net/sctp/user.h
index 4ed7521..80b7afe 100644 (file)
--- a/include/net/sctp/user.h
+++ b/include/net/sctp/user.h
@@ -513,16 +513,17 @@ struct sctp_setadaptation {
  *   address's parameters:
  */
 enum  sctp_spp_flags {
-       SPP_HB_ENABLE = 1,              /*Enable heartbeats*/
-       SPP_HB_DISABLE = 2,             /*Disable heartbeats*/
+       SPP_HB_ENABLE = 1<<0,           /*Enable heartbeats*/
+       SPP_HB_DISABLE = 1<<1,          /*Disable heartbeats*/
        SPP_HB = SPP_HB_ENABLE | SPP_HB_DISABLE,
-       SPP_HB_DEMAND = 4,              /*Send heartbeat immediately*/
-       SPP_PMTUD_ENABLE = 8,           /*Enable PMTU discovery*/
-       SPP_PMTUD_DISABLE = 16,         /*Disable PMTU discovery*/
+       SPP_HB_DEMAND = 1<<2,           /*Send heartbeat immediately*/
+       SPP_PMTUD_ENABLE = 1<<3,        /*Enable PMTU discovery*/
+       SPP_PMTUD_DISABLE = 1<<4,       /*Disable PMTU discovery*/
        SPP_PMTUD = SPP_PMTUD_ENABLE | SPP_PMTUD_DISABLE,
-       SPP_SACKDELAY_ENABLE = 32,      /*Enable SACK*/
-       SPP_SACKDELAY_DISABLE = 64,     /*Disable SACK*/
+       SPP_SACKDELAY_ENABLE = 1<<5,    /*Enable SACK*/
+       SPP_SACKDELAY_DISABLE = 1<<6,   /*Disable SACK*/
        SPP_SACKDELAY = SPP_SACKDELAY_ENABLE | SPP_SACKDELAY_DISABLE,
+       SPP_HB_TIME_IS_ZERO = 1<<7,     /* Set HB delay to 0 */
 };
 
 struct sctp_paddrparams {

diff --git a/net/sctp/socket.c b/net/sctp/socket.c
index 1e787a2..dda2f67 100644 (file)
--- a/net/sctp/socket.c
+++ b/net/sctp/socket.c
@@ -2039,6 +2039,10 @@ static int sctp_setsockopt_autoclose(struct sock *sk, char __user *optval,
  *                     SPP_HB_DEMAND - Request a user initiated heartbeat
  *                     to be made immediately.
  *
+ *                     SPP_HB_TIME_IS_ZERO - Specify's that the time for
+ *                     heartbeat delayis to be set to the value of 0
+ *                     milliseconds.
+ *
  *                     SPP_PMTUD_ENABLE - This field will enable PMTU
  *                     discovery upon the specified address. Note that
  *                     if the address feild is empty then all addresses
@@ -2081,13 +2085,30 @@ static int sctp_apply_peer_addr_params(struct sctp_paddrparams *params,
                        return error;
        }
 
-       if (params->spp_hbinterval) {
-               if (trans) {
-                       trans->hbinterval = msecs_to_jiffies(params->spp_hbinterval);
-               } else if (asoc) {
-                       asoc->hbinterval = msecs_to_jiffies(params->spp_hbinterval);
-               } else {
-                       sp->hbinterval = params->spp_hbinterval;
+       /* Note that unless the spp_flag is set to SPP_HB_ENABLE the value of
+        * this field is ignored.  Note also that a value of zero indicates
+        * the current setting should be left unchanged.
+        */
+       if (params->spp_flags & SPP_HB_ENABLE) {
+
+               /* Re-zero the interval if the SPP_HB_TIME_IS_ZERO is
+                * set.  This lets us use 0 value when this flag
+                * is set.
+                */
+               if (params->spp_flags & SPP_HB_TIME_IS_ZERO)
+                       params->spp_hbinterval = 0;
+
+               if (params->spp_hbinterval ||
+                   (params->spp_flags & SPP_HB_TIME_IS_ZERO)) {
+                       if (trans) {
+                               trans->hbinterval =
+                                   msecs_to_jiffies(params->spp_hbinterval);
+                       } else if (asoc) {
+                               asoc->hbinterval =
+                                   msecs_to_jiffies(params->spp_hbinterval);
+                       } else {
+                               sp->hbinterval = params->spp_hbinterval;
+                       }
                }
        }
 
@@ -2104,7 +2125,12 @@ static int sctp_apply_peer_addr_params(struct sctp_paddrparams *params,
                }
        }
 
-       if (params->spp_pathmtu) {
+       /* When Path MTU discovery is disabled the value specified here will
+        * be the "fixed" path mtu (i.e. the value of the spp_flags field must
+        * include the flag SPP_PMTUD_DISABLE for this field to have any
+        * effect).
+        */
+       if ((params->spp_flags & SPP_PMTUD_DISABLE) && params->spp_pathmtu) {
                if (trans) {
                        trans->pathmtu = params->spp_pathmtu;
                        sctp_assoc_sync_pmtu(asoc);
@@ -2135,7 +2161,11 @@ static int sctp_apply_peer_addr_params(struct sctp_paddrparams *params,
                }
        }
 
-       if (params->spp_sackdelay) {
+       /* Note that unless the spp_flag is set to SPP_SACKDELAY_ENABLE the
+        * value of this field is ignored.  Note also that a value of zero
+        * indicates the current setting should be left unchanged.
+        */
+       if ((params->spp_flags & SPP_SACKDELAY_ENABLE) && params->spp_sackdelay) {
                if (trans) {
                        trans->sackdelay =
                                msecs_to_jiffies(params->spp_sackdelay);
@@ -2163,7 +2193,11 @@ static int sctp_apply_peer_addr_params(struct sctp_paddrparams *params,
                }
        }
 
-       if (params->spp_pathmaxrxt) {
+       /* Note that unless the spp_flag is set to SPP_PMTUD_ENABLE the value
+        * of this field is ignored.  Note also that a value of zero
+        * indicates the current setting should be left unchanged.
+        */
+       if ((params->spp_flags & SPP_PMTUD_ENABLE) && params->spp_pathmaxrxt) {
                if (trans) {
                        trans->pathmaxrxt = params->spp_pathmaxrxt;
                } else if (asoc) {