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authorPeter Oskolkov <posk@google.com>2018-08-03 02:34:37 +0300
committerDavid S. Miller <davem@davemloft.net>2018-08-06 03:16:46 +0300
commit7969e5c40dfd04799d4341f1b7cd266b6e47f227 (patch)
tree167103e66b8f8ebf96bf4ca7644c3e0f7b3bca10 /net/ipv4/proc.c
parentcfb4099fb4c101dad283a163c9525240ef4a1a99 (diff)
downloadlinux-7969e5c40dfd04799d4341f1b7cd266b6e47f227.tar.xz
ip: discard IPv4 datagrams with overlapping segments.
This behavior is required in IPv6, and there is little need to tolerate overlapping fragments in IPv4. This change simplifies the code and eliminates potential DDoS attack vectors. Tested: ran ip_defrag selftest (not yet available uptream). Suggested-by: David S. Miller <davem@davemloft.net> Signed-off-by: Peter Oskolkov <posk@google.com> Signed-off-by: Eric Dumazet <edumazet@google.com> Cc: Florian Westphal <fw@strlen.de> Acked-by: Stephen Hemminger <stephen@networkplumber.org> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4/proc.c')
-rw-r--r--net/ipv4/proc.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/net/ipv4/proc.c b/net/ipv4/proc.c
index b46e4cf9a55a..70289682a670 100644
--- a/net/ipv4/proc.c
+++ b/net/ipv4/proc.c
@@ -119,6 +119,7 @@ static const struct snmp_mib snmp4_ipextstats_list[] = {
SNMP_MIB_ITEM("InECT1Pkts", IPSTATS_MIB_ECT1PKTS),
SNMP_MIB_ITEM("InECT0Pkts", IPSTATS_MIB_ECT0PKTS),
SNMP_MIB_ITEM("InCEPkts", IPSTATS_MIB_CEPKTS),
+ SNMP_MIB_ITEM("ReasmOverlaps", IPSTATS_MIB_REASM_OVERLAPS),
SNMP_MIB_SENTINEL
};