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ovs: Implement 802.1ag Connectivity Fault Management

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This commit implements a subset of the 802.1ag specification for
Connectivity Fault Management (CFM) using Continuity Check Messages
(CCM).  When CFM is configured on an interface CCMs are broadcast
at regular intervals to detect missing or unexpected connectivity.
This commit is contained in:
Ethan Jackson
2010-11-15 16:20:01 -08:00
parent 4617e2c141
commit b31bcf60cf
10 changed files with 931 additions and 0 deletions
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18
lib/packets.h
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@@ -153,6 +153,7 @@ void compose_benign_packet(struct ofpbuf *, const char *tag,
#define ETH_TYPE_IP 0x0800
#define ETH_TYPE_ARP 0x0806
#define ETH_TYPE_VLAN 0x8100
#define ETH_TYPE_CFM 0x8902
#define ETH_HEADER_LEN 14
#define ETH_PAYLOAD_MIN 46
@@ -236,6 +237,23 @@ struct vlan_eth_header {
} __attribute__((packed));
BUILD_ASSERT_DECL(VLAN_ETH_HEADER_LEN == sizeof(struct vlan_eth_header));
/* A 'ccm' represents a Continuity Check Message from the 802.1ag specification.
* Continuity Check Messages are broadcast periodically so that hosts can
* determine who they have connectivity to. */
#define CCM_LEN 74
#define CCM_MAID_LEN 48
struct ccm {
uint8_t mdlevel_version; /* MD Level and Version */
uint8_t opcode;
uint8_t flags;
uint8_t tlv_offset;
uint32_t seq;
uint16_t mpid;
uint8_t maid[CCM_MAID_LEN];
uint8_t zero[16]; /* Defined by ITU-T Y.1731 should be zero */
} __attribute__((packed));
BUILD_ASSERT_DECL(CCM_LEN == sizeof(struct ccm));
/* The "(void) (ip)[0]" below has no effect on the value, since it's the first
* argument of a comma expression, but it makes sure that 'ip' is a pointer.
* This is useful since a common mistake is to pass an integer instead of a