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vxlan: factor out VXLAN-GPE next protocol

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The values are shared between VXLAN-GPE and NSH. Originally probably by
coincidence but I notified both working groups about this last year and they
seem to keep the values in sync since then.

Hopefully they'll get a single IANA registry for the values, too. (I asked
them for that.)

Factor out the code to be shared by the NSH implementation.

NSH and MPLS values are added in this patch, too. For MPLS, the drafts
incorrectly assign only a single value, while we have two MPLS ethertypes.
I raised the problem with both groups. For now, I assume the value is for
unicast.

Signed-off-by: Jiri Benc <jbenc@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jiri Benc 2017-08-28 21:43:22 +02:00 committed by David S. Miller
parent 155e6f6497
commit fa20e0e32c
3 changed files with 56 additions and 31 deletions
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32
drivers/net/vxlan.c
View file

@ -26,6 +26,7 @@
#include <net/inet_ecn.h>
#include <net/net_namespace.h>
#include <net/netns/generic.h>
#include <net/tun_proto.h>
#include <net/vxlan.h>
#if IS_ENABLED(CONFIG_IPV6)
@ -1261,19 +1262,9 @@ static bool vxlan_parse_gpe_hdr(struct vxlanhdr *unparsed,
if (gpe->oam_flag)
return false;
switch (gpe->next_protocol) {
case VXLAN_GPE_NP_IPV4:
*protocol = htons(ETH_P_IP);
break;
case VXLAN_GPE_NP_IPV6:
*protocol = htons(ETH_P_IPV6);
break;
case VXLAN_GPE_NP_ETHERNET:
*protocol = htons(ETH_P_TEB);
break;
default:
*protocol = tun_p_to_eth_p(gpe->next_protocol);
if (!*protocol)
return false;
}
unparsed->vx_flags &= ~VXLAN_GPE_USED_BITS;
return true;
@ -1799,19 +1790,10 @@ static int vxlan_build_gpe_hdr(struct vxlanhdr *vxh, u32 vxflags,
struct vxlanhdr_gpe *gpe = (struct vxlanhdr_gpe *)vxh;
gpe->np_applied = 1;
switch (protocol) {
case htons(ETH_P_IP):
gpe->next_protocol = VXLAN_GPE_NP_IPV4;
return 0;
case htons(ETH_P_IPV6):
gpe->next_protocol = VXLAN_GPE_NP_IPV6;
return 0;
case htons(ETH_P_TEB):
gpe->next_protocol = VXLAN_GPE_NP_ETHERNET;
return 0;
}
return -EPFNOSUPPORT;
gpe->next_protocol = tun_p_from_eth_p(protocol);
if (!gpe->next_protocol)
return -EPFNOSUPPORT;
return 0;
}
static int vxlan_build_skb(struct sk_buff *skb, struct dst_entry *dst,

49
include/net/tun_proto.h Normal file
View file

@ -0,0 +1,49 @@
#ifndef __NET_TUN_PROTO_H
#define __NET_TUN_PROTO_H
#include <linux/kernel.h>
/* One byte protocol values as defined by VXLAN-GPE and NSH. These will
* hopefully get a shared IANA registry.
*/
#define TUN_P_IPV4 0x01
#define TUN_P_IPV6 0x02
#define TUN_P_ETHERNET 0x03
#define TUN_P_NSH 0x04
#define TUN_P_MPLS_UC 0x05
static inline __be16 tun_p_to_eth_p(u8 proto)
{
switch (proto) {
case TUN_P_IPV4:
return htons(ETH_P_IP);
case TUN_P_IPV6:
return htons(ETH_P_IPV6);
case TUN_P_ETHERNET:
return htons(ETH_P_TEB);
case TUN_P_NSH:
return htons(ETH_P_NSH);
case TUN_P_MPLS_UC:
return htons(ETH_P_MPLS_UC);
}
return 0;
}
static inline u8 tun_p_from_eth_p(__be16 proto)
{
switch (proto) {
case htons(ETH_P_IP):
return TUN_P_IPV4;
case htons(ETH_P_IPV6):
return TUN_P_IPV6;
case htons(ETH_P_TEB):
return TUN_P_ETHERNET;
case htons(ETH_P_NSH):
return TUN_P_NSH;
case htons(ETH_P_MPLS_UC):
return TUN_P_MPLS_UC;
}
return 0;
}
#endif

6
include/net/vxlan.h
View file

@ -168,12 +168,6 @@ reserved_flags2:2;
#define VXLAN_GPE_USED_BITS (VXLAN_HF_VER | VXLAN_HF_NP | VXLAN_HF_OAM | \
cpu_to_be32(0xff))
/* VXLAN-GPE header Next Protocol. */
#define VXLAN_GPE_NP_IPV4 0x01
#define VXLAN_GPE_NP_IPV6 0x02
#define VXLAN_GPE_NP_ETHERNET 0x03
#define VXLAN_GPE_NP_NSH 0x04
struct vxlan_metadata {
u32 gbp;
};