Author: cy
Date: Wed Jul 3 17:04:44 2019
New Revision: 349654
URL: https://svnweb.freebsd.org/changeset/base/349654
Log:
MFC r349399-349400,349567-349568:
Prompted by r349366, ipfilter is also does not conform to RFC 3128
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.
Modified:
stable/12/sys/contrib/ipfilter/netinet/fil.c
Directory Properties:
stable/12/ (props changed)
Changes in other areas also in this revision:
Modified:
stable/11/sys/contrib/ipfilter/netinet/fil.c
Directory Properties:
stable/11/ (props changed)
Modified: stable/12/sys/contrib/ipfilter/netinet/fil.c
==============================================================================
--- stable/12/sys/contrib/ipfilter/netinet/fil.c Wed Jul 3 16:53:59
2019 (r349653)
+++ stable/12/sys/contrib/ipfilter/netinet/fil.c Wed Jul 3 17:04:44
2019 (r349654)
@@ -1728,6 +1728,10 @@ ipf_pr_ipv4hdr(fin)
fi->fi_flx |= FI_FRAG;
off &= 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) {
fin->fin_flx |= FI_FRAGBODY;
off <<= 3;
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