Date: Thu, 31 May 2001 14:58:11 -0700 (PDT) From: Jesper Skriver <jesper@FreeBSD.org> To: cvs-committers@FreeBSD.org, cvs-all@FreeBSD.org Subject: cvs commit: src/sys/kern uipc_accf.c uipc_mbuf.c uipc_socket2.c src/sys/netinet ip_input.c src/sys/netinet6 in6_proto.c src/sys/sys param.h Message-ID: <200105312158.f4VLwB659138@freefall.freebsd.org>
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jesper 2001/05/31 14:58:11 PDT
Modified files:
sys/kern uipc_accf.c uipc_mbuf.c uipc_socket2.c
Log:
Move the definition of NMBCLUSTERS from src/sys/kern/uipc_mbuf.c
to <sys/param.h>, so it's available to src/sys/netinet/ip_input.c,
and remove the now unneeded includes of "opt_param.h".
MFC after: 1 week
Revision Changes Path
1.5 +1 -2 src/sys/kern/uipc_accf.c
1.77 +1 -6 src/sys/kern/uipc_mbuf.c
1.68 +1 -2 src/sys/kern/uipc_socket2.c
Modified files:
sys/netinet ip_input.c
Log:
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)
Obtained from: NetBSD (partially)
MFC after: 1 week
Revision Changes Path
1.166 +32 -1 src/sys/netinet/ip_input.c
Modified files:
sys/netinet6 in6_proto.c
Log:
Change the default value of net.inet6.ip6.maxfragpackets from
200 to NMBCLUSTERS/4 to match the IPv4 case.
MFC after: 1 week
Revision Changes Path
1.11 +2 -2 src/sys/netinet6/in6_proto.c
Modified files:
sys/sys param.h
Log:
Move the definition of NMBCLUSTERS from src/sys/kern/uipc_mbuf.c
to <sys/param.h>, so it's available to src/sys/netinet/ip_input.c
MFC after: 1 week
Revision Changes Path
1.92 +6 -1 src/sys/sys/param.h
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