From ef0f963de1d2c5bc99d3d6ace3dd44a7d6002717 Mon Sep 17 00:00:00 2001 From: Peter Oskolkov Date: Wed, 10 Oct 2018 12:30:07 -0700 Subject: ip: discard IPv4 datagrams with overlapping segments. commit 7969e5c40dfd04799d4341f1b7cd266b6e47f227 upstream. 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 Signed-off-by: Peter Oskolkov Signed-off-by: Eric Dumazet Cc: Florian Westphal Acked-by: Stephen Hemminger Signed-off-by: David S. Miller Signed-off-by: Mao Wenan [bwh: Backported to 4.4: - s/__IP_INC_STATS/IP_INC_STATS_BH/ - Deleted code is slightly different] Signed-off-by: Ben Hutchings Signed-off-by: Greg Kroah-Hartman --- include/uapi/linux/snmp.h | 1 + 1 file changed, 1 insertion(+) (limited to 'include/uapi/linux') diff --git a/include/uapi/linux/snmp.h b/include/uapi/linux/snmp.h index 25a9ad8bcef1..9de808ebce05 100644 --- a/include/uapi/linux/snmp.h +++ b/include/uapi/linux/snmp.h @@ -55,6 +55,7 @@ enum IPSTATS_MIB_ECT1PKTS, /* InECT1Pkts */ IPSTATS_MIB_ECT0PKTS, /* InECT0Pkts */ IPSTATS_MIB_CEPKTS, /* InCEPkts */ + IPSTATS_MIB_REASM_OVERLAPS, /* ReasmOverlaps */ __IPSTATS_MIB_MAX }; -- cgit v1.2.3