@@ -33,16 +33,27 @@ 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);
-
- return ((tuninfo->srh->hdrlen + 1) << 3) +
- (encap * sizeof(struct ipv6hdr));
+ int head = 0;
+
+ switch (tuninfo->mode) {
+ case SEG6_IPTUN_MODE_INLINE:
+ break;
+ case SEG6_IPTUN_MODE_ENCAP:
+ head = sizeof(struct ipv6hdr);
+ break;
+ case SEG6_IPTUN_MODE_L2ENCAP:
+ head = sizeof(struct ipv6hdr) + 14;
+ break;
+ }
+
+ return ((tuninfo->srh->hdrlen + 1) << 3) + head;
}
#endif
@@ -240,6 +240,22 @@ static int seg6_do_srh(struct sk_buff *skb)
skb->protocol = htons(ETH_P_IPV6);
break;
+ case SEG6_IPTUN_MODE_L2ENCAP:
+ if (!skb_mac_header_was_set(skb))
+ return -EINVAL;
+
+ if (pskb_expand_head(skb, skb->mac_len, 0, GFP_ATOMIC) < 0)
+ return -ENOMEM;
+
+ skb_mac_header_rebuild(skb);
+ skb_push(skb, skb->mac_len);
+
+ err = seg6_do_srh_encap(skb, tinfo->srh, NEXTHDR_NONE);
+ if (err)
+ return err;
+
+ skb->protocol = htons(ETH_P_IPV6);
+ break;
}
ipv6_hdr(skb)->payload_len = htons(skb->len - sizeof(struct ipv6hdr));
@@ -386,6 +402,8 @@ static int seg6_build_state(struct nlattr *nla,
break;
case SEG6_IPTUN_MODE_ENCAP:
break;
+ case SEG6_IPTUN_MODE_L2ENCAP:
+ break;
default:
return -EINVAL;
}
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> --- include/uapi/linux/seg6_iptunnel.h | 19 +++++++++++++++---- net/ipv6/seg6_iptunnel.c | 18 ++++++++++++++++++ 2 files changed, 33 insertions(+), 4 deletions(-)