1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
|
/* Copyright (c) 2010, 2011 Nicira Networks.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at:
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef CFM_H
#define CFM_H 1
#include <stdint.h>
#include "hmap.h"
#include "openvswitch/types.h"
struct flow;
struct ofpbuf;
/* Ethernet destination address of CCM packets. */
static const uint8_t eth_addr_ccm[6] OVS_UNUSED
= { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x30 };
#define ETH_TYPE_CFM 0x8902
/* 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;
ovs_be32 seq;
ovs_be16 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));
/* A 'cfm' represent a local Maintenance Point (MP) and its Connectivity Fault
* Management (CFM) state machine. Its configuration variables should be set
* by clients of the CFM library. */
struct cfm {
/* Configuration Variables. */
uint16_t mpid; /* The MPID of this CFM. */
uint8_t maid[CCM_MAID_LEN]; /* The MAID of this CFM. */
int interval; /* The requested transmission interval. */
const char *name; /* Name of this CFM object. */
/* Statistics. */
struct hmap remote_mps; /* Expected remote MPs. */
bool fault; /* Indicates connectivity vaults. */
};
/* Remote MPs represent foreign network entities that are configured to have
* the same MAID as this CFM instance. */
struct remote_mp {
uint16_t mpid; /* The Maintenance Point ID of this 'remote_mp'. */
struct hmap_node node; /* In 'cfm' 'remote_mps' or 'x_remote_mps'. */
bool recv; /* CCM was received since last fault check. */
bool fault; /* Indicates a connectivity fault. */
};
void cfm_init(void);
struct cfm *cfm_create(void);
void cfm_destroy(struct cfm *);
void cfm_run(struct cfm *);
bool cfm_should_send_ccm(struct cfm *);
void cfm_compose_ccm(struct cfm *, struct ccm *);
void cfm_wait(struct cfm *);
bool cfm_configure(struct cfm *);
void cfm_update_remote_mps(struct cfm *, const uint16_t *mpid, size_t n_mpids);
const struct remote_mp *cfm_get_remote_mp(const struct cfm *, uint16_t mpid);
bool cfm_generate_maid(const char *md_name, const char *ma_name,
uint8_t maid[CCM_MAID_LEN]);
bool cfm_should_process_flow(const struct flow *);
void cfm_process_heartbeat(struct cfm *, const struct ofpbuf *packet);
#endif /* cfm.h */
|
