CVS commit: src/sys/netinet

["Maxime Villard" <maxv%netbsd.org@localhost>]

Module Name:    src
Committed By:   maxv
Date:           Mon Sep 17 08:11:27 UTC 2018

Modified Files:
        src/sys/netinet: ip_reass.c

Log Message:
Kick fragments that would introduce several !MFFs in a reassembly chain.

The problem arises if we receive three fragments of the kind

        3.  A -> has MFF
        1.  B -> doesn't have MFF
        2.  C -> doesn't have MFF

Because of the received order B->C->A, we don't see that B is !MFF, and
therefore that there is a problem in this chain.

Now we do two checks, and drop us if:

 * there is a fragment preceding us, and this fragment is !MFF, or
 * there is a fragment following us, and we are !MFF

Spotted a long time ago.


To generate a diff of this commit:
cvs rdiff -u -r1.19 -r1.20 src/sys/netinet/ip_reass.c

Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.