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https://github.com/openvswitch/ovs
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dd986e09fd
This makes the code more obviously correct in my opinion. This patch also removes timer_enabled_at() along with its only user.
104 lines
3.2 KiB
C
104 lines
3.2 KiB
C
/*
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* Copyright (c) 2010 Nicira Networks.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at:
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef CFM_H
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#define CFM_H 1
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#include <stdint.h>
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#include "hmap.h"
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#include "openvswitch/types.h"
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struct flow;
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struct ofpbuf;
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struct ds;
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/* Ethernet destination address of CCM packets. */
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static const uint8_t eth_addr_ccm[6] OVS_UNUSED
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= { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x30 };
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#define ETH_TYPE_CFM 0x8902
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/* A 'ccm' represents a Continuity Check Message from the 802.1ag
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* specification. Continuity Check Messages are broadcast periodically so that
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* hosts can determine who they have connectivity to. */
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#define CCM_LEN 74
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#define CCM_MAID_LEN 48
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struct ccm {
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uint8_t mdlevel_version; /* MD Level and Version */
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uint8_t opcode;
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uint8_t flags;
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uint8_t tlv_offset;
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ovs_be32 seq;
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ovs_be16 mpid;
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uint8_t maid[CCM_MAID_LEN];
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uint8_t zero[16]; /* Defined by ITU-T Y.1731 should be zero */
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} __attribute__((packed));
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BUILD_ASSERT_DECL(CCM_LEN == sizeof(struct ccm));
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/* A 'cfm' represent a local Maintenance Point (MP) and its Connectivity Fault
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* Management (CFM) state machine. Its configuration variables should be set
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* by clients of the CFM library. */
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struct cfm {
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/* Configuration Variables. */
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uint16_t mpid; /* The MPID of this CFM. */
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uint8_t maid[CCM_MAID_LEN]; /* The MAID of this CFM. */
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int interval; /* The requested transmission interval. */
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/* Statistics. */
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struct hmap remote_mps; /* Expected remote MPs. */
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bool fault; /* Indicates connectivity vaults. */
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};
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/* Remote MPs represent foreign network entities that are configured to have
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* the same MAID as this CFM instance. */
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struct remote_mp {
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uint16_t mpid; /* The Maintenance Point ID of this 'remote_mp'. */
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struct hmap_node node; /* In 'cfm' 'remote_mps' or 'x_remote_mps'. */
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bool recv; /* CCM was received since last fault check. */
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bool fault; /* Indicates a connectivity fault. */
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};
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struct cfm *cfm_create(void);
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void cfm_destroy(struct cfm *);
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void cfm_run(struct cfm *);
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bool cfm_should_send_ccm(struct cfm *);
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void cfm_compose_ccm(struct cfm *, struct ccm *);
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void cfm_wait(struct cfm *);
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bool cfm_configure(struct cfm *);
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void cfm_update_remote_mps(struct cfm *, const uint16_t *mpid, size_t n_mpids);
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const struct remote_mp *cfm_get_remote_mp(const struct cfm *, uint16_t mpid);
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bool cfm_generate_maid(const char *md_name, const char *ma_name,
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uint8_t maid[CCM_MAID_LEN]);
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bool cfm_should_process_flow(const struct flow *);
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void cfm_process_heartbeat(struct cfm *, const struct ofpbuf *packet);
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void cfm_dump_ds(const struct cfm *, struct ds *);
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#endif /* cfm.h */
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