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Add a problematic TCP option to validateTCPhdr

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This commit is contained in:
dmiller 2014-09-10 18:48:15 +00:00
parent ed604aedc7
commit 47ad1bf67c
1 changed files with 9 additions and 0 deletions
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9
tcpip.cc
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@ -1404,6 +1404,15 @@ static bool validateTCPhdr(u8 *tcpc, unsigned len) {
optlen -= 10;
tcpc += 10;
break;
case 14: /* Alternate checksum */
/* Sometimes used for hardware checksum offloading
* ftp://ftp.ucsd.edu/pub/csl/fastnet/faq.txt
*/
if (optlen < 3)
return false;
optlen -= 3;
tcpc += 3;
break;
default:
optlen--;
tcpc++;