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

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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 <paolo.lungaroni@cnit.it>
Reviewed-by: Andrea Mayer <andrea.mayer@uniroma2.it>
Acked-by: Ahmed Abdelsalam <ahmed.abdelsalam@gssi.it>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Paolo Lungaroni 2020-03-11 17:54:06 +01:00 committed by David S. Miller
parent a20f997010
commit 2677625387
3 changed files with 4 additions and 2 deletions
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2
include/uapi/linux/in.h
View File

@ -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 */

2
net/ipv6/seg6_iptunnel.c
View File

@ -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;

2
net/ipv6/seg6_local.c
View File

@ -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))