lib/cfm.h

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