Re: [lwip-users] No Ping Response

[kerem]

Hello,

The reasons is your previous working version of icmp.c has been modified by
ST. So to make the ping work in your new version:

1) modify lwipopts.h

#ifdef CHECKSUM_BY_HARDWARE
  /* CHECKSUM_GEN_IP==0: Generate checksums by hardware for outgoing IP
packets.*/
  #define CHECKSUM_GEN_IP                 0
  /* CHECKSUM_GEN_UDP==0: Generate checksums by hardware for outgoing UDP
packets.*/
  #define CHECKSUM_GEN_UDP                0
  /* CHECKSUM_GEN_TCP==0: Generate checksums by hardware for outgoing TCP
packets.*/
  #define CHECKSUM_GEN_TCP                0 
  /* CHECKSUM_CHECK_IP==0: Check checksums by hardware for incoming IP
packets.*/
  #define CHECKSUM_CHECK_IP               0
  /* CHECKSUM_CHECK_UDP==0: Check checksums by hardware for incoming UDP
packets.*/
  #define CHECKSUM_CHECK_UDP              0
  /* CHECKSUM_CHECK_TCP==0: Check checksums by hardware for incoming TCP
packets.*/
  #define CHECKSUM_CHECK_TCP              0
  /* CHECKSUM_GEN_ICMP==1: Generate checksums in software for outgoing ICMP
packets.*/
  #define CHECKSUM_GEN_ICMP               0
#else
  /* CHECKSUM_GEN_IP==1: Generate checksums in software for outgoing IP
packets.*/
  #define CHECKSUM_GEN_IP                 1
  /* CHECKSUM_GEN_UDP==1: Generate checksums in software for outgoing UDP
packets.*/
  #define CHECKSUM_GEN_UDP                1
  /* CHECKSUM_GEN_TCP==1: Generate checksums in software for outgoing TCP
packets.*/
  #define CHECKSUM_GEN_TCP                1
  /* CHECKSUM_CHECK_IP==1: Check checksums in software for incoming IP
packets.*/
  #define CHECKSUM_CHECK_IP               1
  /* CHECKSUM_CHECK_UDP==1: Check checksums in software for incoming UDP
packets.*/
  #define CHECKSUM_CHECK_UDP              1
  /* CHECKSUM_CHECK_TCP==1: Check checksums in software for incoming TCP
packets.*/
  #define CHECKSUM_CHECK_TCP              1
  /* CHECKSUM_GEN_ICMP==1: Generate checksums in software for outgoing ICMP
packets.*/
  #define CHECKSUM_GEN_ICMP               1
#endif

2) arrange icmp.c "icmp_input" function (somewhere around line 190)

#if CHECKSUM_GEN_ICMP
    /* adjust the checksum */
    if (iecho->chksum >= PP_HTONS(0xffffU - (ICMP_ECHO << 8))) {
      iecho->chksum += PP_HTONS(ICMP_ECHO << 8) + 1;
    } else {
      iecho->chksum += PP_HTONS(ICMP_ECHO << 8);
    }
#else /* CHECKSUM_GEN_ICMP */
    iecho->chksum = 0;
#endif /* CHECKSUM_GEN_ICMP */


Kerem




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