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ipv6: sr: add support for encapsulation of L2 frames

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This patch implements the L2 frame encapsulation mechanism, referred to
as T.Encaps.L2 in the SRv6 specifications [1].

A new type of SRv6 tunnel mode is added (SEG6_IPTUN_MODE_L2ENCAP). It only
accepts packets with an existing MAC header (i.e., it will not work for
locally generated packets). The resulting packet looks like IPv6 -> SRH ->
Ethernet -> original L3 payload. The next header field of the SRH is set to
NEXTHDR_NONE.

[1] https://tools.ietf.org/html/draft-filsfils-spring-srv6-network-programming-01

Signed-off-by: David Lebrun <david.lebrun@uclouvain.be>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David Lebrun
2017-08-25 09:56:45 +02:00
committed by David S. Miller
parent 32d99d0b67
commit 38ee7f2d47
2 changed files with 36 additions and 5 deletions
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16
include/uapi/linux/seg6_iptunnel.h
View File

@@ -33,16 +33,26 @@ struct seg6_iptunnel_encap {
enum {
SEG6_IPTUN_MODE_INLINE,
SEG6_IPTUN_MODE_ENCAP,
SEG6_IPTUN_MODE_L2ENCAP,
};
#ifdef __KERNEL__
static inline size_t seg6_lwt_headroom(struct seg6_iptunnel_encap *tuninfo)
{
int encap = (tuninfo->mode == SEG6_IPTUN_MODE_ENCAP);
int head = 0;
return ((tuninfo->srh->hdrlen + 1) << 3) +
(encap * sizeof(struct ipv6hdr));
switch (tuninfo->mode) {
case SEG6_IPTUN_MODE_INLINE:
break;
case SEG6_IPTUN_MODE_ENCAP:
head = sizeof(struct ipv6hdr);
break;
case SEG6_IPTUN_MODE_L2ENCAP:
return 0;
}
return ((tuninfo->srh->hdrlen + 1) << 3) + head;
}
#endif