lib/cfm.h

   1 /* Copyright (c) 2010, 2011 Nicira Networks.
   2  *
   3  * Licensed under the Apache License, Version 2.0 (the "License");
   4  * you may not use this file except in compliance with the License.
   5  * You may obtain a copy of the License at:
   6  *
   7  *     http://www.apache.org/licenses/LICENSE-2.0
   8  *
   9  * Unless required by applicable law or agreed to in writing, software
  10  * distributed under the License is distributed on an "AS IS" BASIS,
  11  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  12  * See the License for the specific language governing permissions and
  13  * limitations under the License.
  14  */
  15
  16 #ifndef CFM_H
  17 #define CFM_H 1
  18
  19 #include <stdint.h>
  20
  21 #include "hmap.h"
  22 #include "openvswitch/types.h"
  23
  24 struct flow;
  25 struct ofpbuf;
  26
  27 /* Ethernet destination address of CCM packets. */
  28 static const uint8_t eth_addr_ccm[6] OVS_UNUSED
  29     = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x30 };
  30
  31 #define ETH_TYPE_CFM 0x8902
  32
  33 /* A 'ccm' represents a Continuity Check Message from the 802.1ag
  34  * specification.  Continuity Check Messages are broadcast periodically so that
  35  * hosts can determine who they have connectivity to. */
  36 #define CCM_LEN 74
  37 #define CCM_MAID_LEN 48
  38 struct ccm {
  39     uint8_t  mdlevel_version; /* MD Level and Version */
  40     uint8_t  opcode;
  41     uint8_t  flags;
  42     uint8_t  tlv_offset;
  43     ovs_be32 seq;
  44     ovs_be16 mpid;
  45     uint8_t  maid[CCM_MAID_LEN];
  46     uint8_t  zero[16]; /* Defined by ITU-T Y.1731 should be zero */
  47 } __attribute__((packed));
  48 BUILD_ASSERT_DECL(CCM_LEN == sizeof(struct ccm));
  49
  50 /* A 'cfm' represent a local Maintenance Point (MP) and its Connectivity Fault
  51  * Management (CFM) state machine.  Its configuration variables should be set
  52  * by clients of the CFM library. */
  53 struct cfm {
  54     /* Configuration Variables. */
  55     uint16_t mpid;              /* The MPID of this CFM. */
  56     int interval;               /* The requested transmission interval. */
  57     const char *name;           /* Name of this CFM object. */
  58
  59     /* Statistics. */
  60     bool fault;                 /* Indicates connectivity vaults. */
  61 };
  62
  63 void cfm_init(void);
  64
  65 struct cfm *cfm_create(void);
  66
  67 void cfm_destroy(struct cfm *);
  68
  69 void cfm_run(struct cfm *);
  70
  71 bool cfm_should_send_ccm(struct cfm *);
  72
  73 void cfm_compose_ccm(struct cfm *, struct ccm *);
  74
  75 void cfm_wait(struct cfm *);
  76
  77 bool cfm_configure(struct cfm *);
  78
  79 void cfm_update_remote_mps(struct cfm *, const uint16_t *mpid, size_t n_mpids);
  80
  81 bool cfm_should_process_flow(const struct flow *);
  82
  83 void cfm_process_heartbeat(struct cfm *, const struct ofpbuf *packet);
  84
  85 #endif /* cfm.h */