1434 TCP_INIT_CWND setsockopt doesn't work on passive connections.

*** 692,714 ****
                          /*
                           * Only allow socket with network configuration
                           * privilege to set the initial cwnd to be larger
                           * than allowed by RFC 3390.
                           */
!                         if (val <= MIN(4, MAX(2, 4380 / tcp->tcp_mss))) {
!                                 tcp->tcp_init_cwnd = val;
!                                 break;
!                         }
!                         if ((reterr = secpolicy_ip_config(cr, B_TRUE)) != 0) {
                                  *outlenp = 0;
                                  return (reterr);
                          }
                          if (val > tcp_max_init_cwnd) {
                                  *outlenp = 0;
                                  return (EINVAL);
                          }
                          tcp->tcp_init_cwnd = val;
                          break;
  
                  /*
                   * TCP_KEEPIDLE is in seconds but TCP_KEEPALIVE_THRESHOLD
                   * is in milliseconds. TCP_KEEPIDLE is introduced for
--- 692,724 ----
                          /*
                           * Only allow socket with network configuration
                           * privilege to set the initial cwnd to be larger
                           * than allowed by RFC 3390.
                           */
!                         if (val > MIN(4, MAX(2, 4380 / tcp->tcp_mss))) {
!                                 if ((reterr = secpolicy_ip_config(cr, B_TRUE))
!                                     != 0) {
                                          *outlenp = 0;
                                          return (reterr);
                                  }
                                  if (val > tcp_max_init_cwnd) {
                                          *outlenp = 0;
                                          return (EINVAL);
                                  }
+                         }
+ 
                          tcp->tcp_init_cwnd = val;
+ 
+                         /*
+                          * If the socket is connected, AND no outbound data
+                          * has been sent, reset the actual cwnd values.
+                          */
+                         if (tcp->tcp_state == TCPS_ESTABLISHED &&
+                             tcp->tcp_iss == tcp->tcp_snxt - 1) {
+                                 tcp->tcp_cwnd =
+                                     MIN(tcp->tcp_rwnd, val * tcp->tcp_mss);
+                         }
                          break;
  
                  /*
                   * TCP_KEEPIDLE is in seconds but TCP_KEEPALIVE_THRESHOLD
                   * is in milliseconds. TCP_KEEPIDLE is introduced for