From 13f0296be8ece1189cbc4383a45ba97cafaecc09 Mon Sep 17 00:00:00 2001 From: Andrea Mayer Date: Wed, 27 Jul 2022 20:54:06 +0200 Subject: seg6: add support for SRv6 H.L2Encaps.Red behavior 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 Signed-off-by: Anton Makarov Signed-off-by: David S. Miller --- net/ipv6/seg6_iptunnel.c | 12 +++++++++++- 1 file changed, 11 insertions(+), 1 deletion(-) (limited to 'net/ipv6') diff --git a/net/ipv6/seg6_iptunnel.c b/net/ipv6/seg6_iptunnel.c index 454bd8a838e6..34db881204d2 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; } @@ -413,6 +414,7 @@ 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; @@ -422,7 +424,13 @@ 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; @@ -643,6 +651,8 @@ 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; } -- cgit v1.2.3-59-g8ed1b