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This patch creates a new type of interfaceless lightweight tunnel (SEG6), enabling the encapsulation and injection of SRH within locally emitted packets and forwarded packets. >From a configuration viewpoint, a seg6 tunnel would be configured as follows: ip -6 ro ad fc00::1/128 encap seg6 mode encap segs fc42::1,fc42::2,fc42::3 dev eth0 Any packet whose destination address is fc00::1 would thus be encapsulated within an outer IPv6 header containing the SRH with three segments, and would actually be routed to the first segment of the list. If `mode inline' was specified instead of `mode encap', then the SRH would be directly inserted after the IPv6 header without outer encapsulation. The inline mode is only available if CONFIG_IPV6_SEG6_INLINE is enabled. This feature was made configurable because direct header insertion may break several mechanisms such as PMTUD or IPSec AH. Signed-off-by: David Lebrun <david.lebrun@uclouvain.be> Signed-off-by: David S. Miller <davem@davemloft.net>
44 lines
1,013 B
C
44 lines
1,013 B
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_IPTUNNEL_H
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#define _UAPI_LINUX_SEG6_IPTUNNEL_H
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enum {
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SEG6_IPTUNNEL_UNSPEC,
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SEG6_IPTUNNEL_SRH,
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__SEG6_IPTUNNEL_MAX,
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};
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#define SEG6_IPTUNNEL_MAX (__SEG6_IPTUNNEL_MAX - 1)
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struct seg6_iptunnel_encap {
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int mode;
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struct ipv6_sr_hdr srh[0];
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};
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#define SEG6_IPTUN_ENCAP_SIZE(x) ((sizeof(*x)) + (((x)->srh->hdrlen + 1) << 3))
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enum {
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SEG6_IPTUN_MODE_INLINE,
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SEG6_IPTUN_MODE_ENCAP,
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};
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static inline size_t seg6_lwt_headroom(struct seg6_iptunnel_encap *tuninfo)
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{
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int encap = (tuninfo->mode == SEG6_IPTUN_MODE_ENCAP);
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return ((tuninfo->srh->hdrlen + 1) << 3) +
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(encap * sizeof(struct ipv6hdr));
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}
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#endif
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