[lwip-devel] [bug #20779] Keep-Alive and SYNs

[Kieran Mansley]

Update of bug #20779 (project lwip):

            lwIP version:                    None => 1.3.0                  

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Follow-up Comment #13:

How's this for a patch to solve this problem:

Index: tcp_in.c
===================================================================
RCS file: /sources/lwip/lwip/src/core/tcp_in.c,v
retrieving revision 1.102
diff -u -r1.102 tcp_in.c
--- tcp_in.c    19 Dec 2008 18:08:30 -0000      1.102
+++ tcp_in.c    25 Mar 2009 13:46:59 -0000
@@ -531,6 +535,12 @@
     }
   }
 
+  if ((flags & TCP_SYN) && (pcb->state != SYN_SENT && pcb->state !=
SYN_RCVD)) { 
+    /* Cope with new connection attempt after remote end crashed */
+    tcp_ack_now(pcb);
+    return ERR_OK;
+  }
+  
   /* Update the PCB (in)activity timer. */
   pcb->tmr = tcp_ticks;
   pcb->keep_cnt_sent = 0;

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