From 16a63c655489c832e914d694fa87cb59635ed223 Mon Sep 17 00:00:00 2001
From: goldsimon <goldsimon>
Date: Tue, 16 Feb 2010 20:38:35 +0000
Subject: [PATCH] Bug #28917: don't increase error counters for icmp echo
 response

---
 src/core/ipv4/icmp.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/core/ipv4/icmp.c b/src/core/ipv4/icmp.c
index bc649c56..b9326bd9 100644
--- a/src/core/ipv4/icmp.c
+++ b/src/core/ipv4/icmp.c
@@ -101,6 +101,10 @@ icmp_input(struct pbuf *p, struct netif *inp)
   code = *(((u8_t *)p->payload)+1);
 #endif /* LWIP_DEBUG */
   switch (type) {
+  case ICMP_ER:
+    /* This is OK, echo reply might have been parsed by a raw PCB
+       (as obviously, an echo request has been sent, too). */
+    break; 
   case ICMP_ECHO:
 #if !LWIP_MULTICAST_PING || !LWIP_BROADCAST_PING
     {