The SRv6 H.L2Encaps.Red behavior described in [1] is an optimization of the SRv6 H.L2Encaps behavior [2].
H.L2Encaps.Red reduces the length of the SRH by excluding the first segment (SID) in the SRH of the pushed IPv6 header. The first SID is only placed in the IPv6 Destination Address field of the pushed IPv6 header.
When the SRv6 Policy only contains one SID the SRH is omitted, unless there is an HMAC TLV to be carried.
[1] - https://datatracker.ietf.org/doc/html/rfc8986#section-5.4 [2] - https://datatracker.ietf.org/doc/html/rfc8986#section-5.3
Signed-off-by: Andrea Mayer andrea.mayer@uniroma2.it Signed-off-by: Anton Makarov anton.makarov11235@gmail.com --- include/uapi/linux/seg6_iptunnel.h | 1 + net/ipv6/seg6_iptunnel.c | 12 +++++++++++- 2 files changed, 12 insertions(+), 1 deletion(-)
diff --git a/include/uapi/linux/seg6_iptunnel.h b/include/uapi/linux/seg6_iptunnel.h index 538152a7b2c3..a9fa777f16de 100644 --- a/include/uapi/linux/seg6_iptunnel.h +++ b/include/uapi/linux/seg6_iptunnel.h @@ -36,6 +36,7 @@ enum { SEG6_IPTUN_MODE_ENCAP, SEG6_IPTUN_MODE_L2ENCAP, SEG6_IPTUN_MODE_ENCAP_RED, + SEG6_IPTUN_MODE_L2ENCAP_RED, };
#endif diff --git a/net/ipv6/seg6_iptunnel.c b/net/ipv6/seg6_iptunnel.c index 4942073650d3..335ed8788b6e 100644 --- a/net/ipv6/seg6_iptunnel.c +++ b/net/ipv6/seg6_iptunnel.c @@ -40,6 +40,7 @@ static size_t seg6_lwt_headroom(struct seg6_iptunnel_encap *tuninfo) head = sizeof(struct ipv6hdr); break; case SEG6_IPTUN_MODE_L2ENCAP: + case SEG6_IPTUN_MODE_L2ENCAP_RED: return 0; }
@@ -407,6 +408,7 @@ static int seg6_do_srh(struct sk_buff *skb) skb->protocol = htons(ETH_P_IPV6); break; case SEG6_IPTUN_MODE_L2ENCAP: + case SEG6_IPTUN_MODE_L2ENCAP_RED: if (!skb_mac_header_was_set(skb)) return -EINVAL;
@@ -416,7 +418,13 @@ static int seg6_do_srh(struct sk_buff *skb) skb_mac_header_rebuild(skb); skb_push(skb, skb->mac_len);
- err = seg6_do_srh_encap(skb, tinfo->srh, IPPROTO_ETHERNET); + if (tinfo->mode == SEG6_IPTUN_MODE_L2ENCAP) + err = seg6_do_srh_encap(skb, tinfo->srh, + IPPROTO_ETHERNET); + else + err = seg6_do_srh_encap_red(skb, tinfo->srh, + IPPROTO_ETHERNET); + if (err) return err;
@@ -638,6 +646,8 @@ static int seg6_build_state(struct net *net, struct nlattr *nla, break; case SEG6_IPTUN_MODE_ENCAP_RED: break; + case SEG6_IPTUN_MODE_L2ENCAP_RED: + break; default: return -EINVAL; }