Date: Sun, 5 Aug 2001 16:08:38 -0700 (PDT) From: Jesper Skriver <jesper@FreeBSD.org> To: cvs-committers@FreeBSD.org, cvs-all@FreeBSD.org Subject: cvs commit: src/sys/netinet ip_input.c src/sys/netinet6 frag6.c in6_proto.c Message-ID: <200108052308.f75N8cq40295@freefall.freebsd.org>
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jesper 2001/08/05 16:08:38 PDT
Modified files: (Branch: RELENG_4_3)
sys/netinet ip_input.c
sys/netinet6 frag6.c in6_proto.c
Log:
MFS
src/sys/netinet/ip_input.c rev 1.130.2.22
src/sys/netinet6/frag6.c rev 1.2.2.4
src/sys/netinet6/in6_proto.c rev 1.6.2.4
Prevent denial of service using bogus fragmented IPv4 packets.
A attacker sending a lot of bogus fragmented packets to the target
(with different IPv4 identification field - ip_id), may be able
to put the target machine into mbuf starvation state.
By setting a upper limit on the number of reassembly queues we
prevent this situation.
This upper limit is controlled by the new sysctl
net.inet.ip.maxfragpackets which defaults to nmbclusters/4
If you want old behaviour (no upper limit) set this sysctl
to a negative value.
If you don't want to accept any fragments (not recommended)
set the sysctl to 0 (zero)
Change the default value of net.inet6.ip6.maxfragpackets from
200 to nmbclusters/4 to match the IPv4 case.
Approved by: security-officer (kris)
Obtained from: NetBSD (partially)
Revision Changes Path
1.130.2.21.2.1 +34 -2 src/sys/netinet/ip_input.c
1.2.2.2.2.1 +3 -1 src/sys/netinet6/frag6.c
1.6.2.3.2.1 +2 -2 src/sys/netinet6/in6_proto.c
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