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1ababeba4a
Implement minimal support for processing of SR-enabled packets as described in https://tools.ietf.org/html/draft-ietf-6man-segment-routing-header-02. This patch implements the following operations: - Intermediate segment endpoint: incrementation of active segment and rerouting. - Egress for SR-encapsulated packets: decapsulation of outer IPv6 header + SRH and routing of inner packet. - Cleanup flag support for SR-inlined packets: removal of SRH if we are the penultimate segment endpoint. A per-interface sysctl seg6_enabled is provided, to accept/deny SR-enabled packets. Default is deny. This patch does not provide support for HMAC-signed packets. Signed-off-by: David Lebrun <david.lebrun@uclouvain.be> Signed-off-by: David S. Miller <davem@davemloft.net>
54 lines
1.1 KiB
C
54 lines
1.1 KiB
C
/*
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* SR-IPv6 implementation
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*
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* Author:
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* David Lebrun <david.lebrun@uclouvain.be>
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*
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#ifndef _UAPI_LINUX_SEG6_H
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#define _UAPI_LINUX_SEG6_H
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/*
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* SRH
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*/
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struct ipv6_sr_hdr {
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__u8 nexthdr;
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__u8 hdrlen;
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__u8 type;
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__u8 segments_left;
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__u8 first_segment;
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__u8 flag_1;
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__u8 flag_2;
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__u8 reserved;
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struct in6_addr segments[0];
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};
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#define SR6_FLAG1_CLEANUP (1 << 7)
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#define SR6_FLAG1_PROTECTED (1 << 6)
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#define SR6_FLAG1_OAM (1 << 5)
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#define SR6_FLAG1_ALERT (1 << 4)
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#define SR6_FLAG1_HMAC (1 << 3)
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#define SR6_TLV_INGRESS 1
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#define SR6_TLV_EGRESS 2
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#define SR6_TLV_OPAQUE 3
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#define SR6_TLV_PADDING 4
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#define SR6_TLV_HMAC 5
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#define sr_has_cleanup(srh) ((srh)->flag_1 & SR6_FLAG1_CLEANUP)
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#define sr_has_hmac(srh) ((srh)->flag_1 & SR6_FLAG1_HMAC)
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struct sr6_tlv {
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__u8 type;
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__u8 len;
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__u8 data[0];
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};
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#endif
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