From 16fcc85c283537ea00357e2ca4bbb561c03bc65b Mon Sep 17 00:00:00 2001 From: Pablo Neira Ayuso Date: Wed, 11 May 2016 00:21:24 +0200 Subject: src: add dscp support This supports both IPv4: # nft --debug=netlink add rule filter forward ip dscp cs1 counter ip filter forward [ payload load 1b @ network header + 1 => reg 1 ] [ bitwise reg 1 = (reg=1 & 0x000000fc ) ^ 0x00000000 ] [ cmp neq reg 1 0x00000080 ] [ counter pkts 0 bytes 0 ] And also IPv6, note that in this case we take two bytes from the payload: # nft --debug=netlink add rule ip6 filter input ip6 dscp cs4 counter ip6 filter input [ payload load 2b @ network header + 0 => reg 1 ] [ bitwise reg 1 = (reg=1 & 0x0000c00f ) ^ 0x00000000 ] [ cmp eq reg 1 0x00000008 ] [ counter pkts 0 bytes 0 ] Given the DSCP is split in two bytes, the less significant nibble of the first byte and the two most significant 2 bits of the second byte. The 8 bit traffic class in RFC2460 after the version field are used for DSCP (6 bit) and ECN (2 bit). Support for ECN comes in a follow up patch. Signed-off-by: Pablo Neira Ayuso --- include/proto.h | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) (limited to 'include/proto.h') diff --git a/include/proto.h b/include/proto.h index 2a662a1a..14af9653 100644 --- a/include/proto.h +++ b/include/proto.h @@ -183,7 +183,7 @@ enum ip_hdr_fields { IPHDR_INVALID, IPHDR_VERSION, IPHDR_HDRLENGTH, - IPHDR_TOS, + IPHDR_DSCP, IPHDR_LENGTH, IPHDR_ID, IPHDR_FRAG_OFF, @@ -220,7 +220,7 @@ enum icmp6_hdr_fields { enum ip6_hdr_fields { IP6HDR_INVALID, IP6HDR_VERSION, - IP6HDR_PRIORITY, + IP6HDR_DSCP, IP6HDR_FLOWLABEL, IP6HDR_LENGTH, IP6HDR_NEXTHDR, -- cgit v1.2.3