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Prompted by r349366, ipfilter is also does not conform to RFC 3128

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by dropping TCP fragments with offset = 1.

In addition to dropping these fragments, add a DTrace probe to allow
for more detailed monitoring and diagnosis if required.

MFC after:	1 week
This commit is contained in:
Cy Schubert 2019-06-26 00:53:43 +00:00
parent 519346ce8c
commit 7f39a7e492
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=349399
1 changed files with 4 additions and 0 deletions
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4
sys/contrib/ipfilter/netinet/fil.c
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@ -1723,6 +1723,10 @@ ipf_pr_ipv4hdr(fin)
* calculate the byte offset that it represents.
*/
off &= IP_MF|IP_OFFMASK;
if (off == 1 && p == IPPROTO_TCP) {
fin->fin_flx |= FI_SHORT; /* RFC 3128 */
DT1(ipf_fi_tcp_frag_off_1, fr_info_t *, fin);
}
if (off != 0) {
int morefrag = off & IP_MF;