sergiotarxz/nuttx
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Better fix

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git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@1618 42af7a65-404d-4744-a932-0658087f49c3
This commit is contained in:
patacongo 2009-03-16 01:05:55 +00:00
parent 7f9d35a3c4
commit c931fc4752
1 changed files with 17 additions and 0 deletions

17
net/uip/uip_icmpinput.c

@ -142,12 +142,29 @@ void uip_icmpinput(struct uip_driver_s *dev)
/* Recalculate the ICMP checksum */
#if 0
/* The slow way... sum over the ICMP message */
picmp->icmpchksum = 0;
picmp->icmpchksum = ~uip_icmpchksum(dev, (((uint16)picmp->len[0] << 8) | (uint16)picmp->len[1]) - UIP_IPH_LEN);
if (picmp->icmpchksum == 0)
{
picmp->icmpchksum = 0xffff;
}
#else
/* The quick way -- Since only the type has changed, just adjust the
* checksum for the change of type
*/
if( picmp->icmpchksum >= HTONS(0xffff - (ICMP_ECHO_REQUEST << 8)))
{
picmp->icmpchksum += HTONS(ICMP_ECHO_REQUEST << 8) + 1;
}
else
{
picmp->icmpchksum += HTONS(ICMP_ECHO_REQUEST << 8);
}
#endif
nvdbg("Outgoing ICMP packet length: %d (%d)\n",
dev->d_len, (picmp->len[0] << 8) | picmp->len[1]);