seg6: fix SRv6 L2 tunnels to use IANA-assigned protocol number

The Internet Assigned Numbers Authority (IANA) has recently assigned
a protocol number value of 143 for Ethernet [1].

Before this assignment, encapsulation mechanisms such as Segment Routing
used the IPv6-NoNxt protocol number (59) to indicate that the encapsulated
payload is an Ethernet frame.

In this patch, we add the definition of the Ethernet protocol number to the
kernel headers and update the SRv6 L2 tunnels to use it.

[1] https://www.iana.org/assignments/protocol-numbers/protocol-numbers.xhtml

Signed-off-by: Paolo Lungaroni <[email protected]>
Reviewed-by: Andrea Mayer <[email protected]>
Acked-by: Ahmed Abdelsalam <[email protected]>
Signed-off-by: David S. Miller <[email protected]>

diff --git a/include/uapi/linux/in.h b/include/uapi/linux/in.h
index 1521073b634800f5ee1c01e08ff86742dab0d2f5..8533bf07450f0b483678a125e272af4c6505d9dc 100644 (file)
--- a/include/uapi/linux/in.h
+++ b/include/uapi/linux/in.h
@@ -74,6 +74,8 @@ enum {
 #define IPPROTO_UDPLITE                IPPROTO_UDPLITE
   IPPROTO_MPLS = 137,          /* MPLS in IP (RFC 4023)                */
 #define IPPROTO_MPLS           IPPROTO_MPLS
+  IPPROTO_ETHERNET = 143,      /* Ethernet-within-IPv6 Encapsulation   */
+#define IPPROTO_ETHERNET       IPPROTO_ETHERNET
   IPPROTO_RAW = 255,           /* Raw IP packets                       */
 #define IPPROTO_RAW            IPPROTO_RAW
   IPPROTO_MPTCP = 262,         /* Multipath TCP connection             */

diff --git a/net/ipv6/seg6_iptunnel.c b/net/ipv6/seg6_iptunnel.c
index ab7f124ff5d7e8a69e84fae0c72c581a716266f5..8c52efe299cced6c79575033814c62d82d1f7295 100644 (file)
--- a/net/ipv6/seg6_iptunnel.c
+++ b/net/ipv6/seg6_iptunnel.c
@@ -268,7 +268,7 @@ 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, NEXTHDR_NONE);
+               err = seg6_do_srh_encap(skb, tinfo->srh, IPPROTO_ETHERNET);
                if (err)
                        return err;
 

diff --git a/net/ipv6/seg6_local.c b/net/ipv6/seg6_local.c
index 7cbc19731997969bf7eec4ea5e1e8dd20d9e3da1..8165802d8e05dea47225264f20f995b5962565ae 100644 (file)
--- a/net/ipv6/seg6_local.c
+++ b/net/ipv6/seg6_local.c
@@ -282,7 +282,7 @@ static int input_action_end_dx2(struct sk_buff *skb,
        struct net_device *odev;
        struct ethhdr *eth;
 
-       if (!decap_and_validate(skb, NEXTHDR_NONE))
+       if (!decap_and_validate(skb, IPPROTO_ETHERNET))
                goto drop;
 
        if (!pskb_may_pull(skb, ETH_HLEN))