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/* $OpenBSD: bfd.h,v 1.10 2017/01/19 23:18:29 phessler Exp $ */
/*
* Copyright (c) 2016 Peter Hessler <phessler@openbsd.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
/*
* Support for Bi-directional Forwarding Detection (RFC 5880 / 5881)
*/
#ifndef _NET_BFD_H_
#define _NET_BFD_H_
/* Public Interface */
#define BFD_MODE_ASYNC 1
#define BFD_MODE_DEMAND 2
/* Diagnostic Code (RFC 5880 Page 8) */
#define BFD_DIAG_NONE 0
#define BFD_DIAG_EXPIRED 1
#define BFD_DIAG_ECHO_FAILED 2
#define BFD_DIAG_NEIGHBOR_SIGDOWN 3
#define BFD_DIAG_FIB_RESET 4
#define BFD_DIAG_PATH_DOWN 5
#define BFD_DIAG_CONCAT_PATH_DOWN 6
#define BFD_DIAG_ADMIN_DOWN 7
#define BFD_DIAG_CONCAT_REVERSE_DOWN 8
/* State (RFC 5880 Page 8) */
#define BFD_STATE_ADMINDOWN 0
#define BFD_STATE_DOWN 1
#define BFD_STATE_INIT 2
#define BFD_STATE_UP 3
/* Flags (RFC 5880 Page 8) */
#define BFD_FLAG_P 0x20
#define BFD_FLAG_F 0x10
#define BFD_FLAG_C 0x08
#define BFD_FLAG_A 0x04
#define BFD_FLAG_D 0x02
#define BFD_FLAG_M 0x01
struct sockaddr_bfd {
uint8_t bs_len; /* total length */
uint8_t bs_family; /* address family */
/* above matches sockaddr_storage */
/* Sorted for bit boundaries */
uint16_t bs_mode;
uint32_t bs_localdiscr;
int64_t bs_uptime;
int64_t bs_lastuptime;
uint32_t bs_mintx;
uint32_t bs_minrx;
uint32_t bs_minecho;
uint32_t bs_localdiag;
uint32_t bs_remotediscr;
uint32_t bs_remotediag;
uint16_t bs_multiplier;
uint16_t bs_pad0;
int bs_state;
int bs_remotestate;
int bs_laststate;
int bs_error;
/* add padding to reach a power of two */
uint64_t bs_pad1;
};
struct bfd_msghdr {
uint16_t bm_msglen;
uint8_t bm_version;
uint8_t bm_type;
uint16_t bm_hdrlen;
uint16_t bm_index;
uint16_t bm_tableid;
uint8_t bm_priority;
uint8_t bm_mpls;
int bm_addrs;
int bm_flags;
/* above matches rt_msghdr */
uint16_t bm_pad0; /* for 4 byte boundary */
struct sockaddr_bfd bm_sa; /* bfd msg for userland */
};
#ifdef _KERNEL
/* state machine from RFC 5880 6.8.1*/
struct bfd_neighbor {
uint32_t bn_lstate; /* SessionState */
uint32_t bn_rstate; /* RemoteSessionState */
uint32_t bn_ldiscr; /* LocalDiscr */
uint32_t bn_rdiscr; /* RemoteDiscr */
uint32_t bn_ldiag; /* LocalDiag */
uint32_t bn_rdiag; /* RemoteDiag */
uint32_t bn_mintx; /* DesiredMinTxInterval */
uint32_t bn_req_minrx; /* RequiredMinRxInterval */
uint32_t bn_rminrx; /* RemoteMinRxInterval */
uint32_t bn_demand; /* DemandMode */
uint32_t bn_rdemand; /* RemoteDemandMode */
uint32_t bn_mult; /* DetectMult */
uint32_t bn_authtype; /* AuthType */
uint32_t bn_rauthseq; /* RcvAuthSeq */
uint32_t bn_lauthseq; /* XmitAuthSeq */
uint32_t bn_authseqknown; /* AuthSeqKnown */
};
struct bfd_config {
TAILQ_ENTRY(bfd_config) bc_entry;
struct socket *bc_so;
struct socket *bc_soecho;
struct socket *bc_sosend;
struct rtentry *bc_rt;
struct bfd_neighbor *bc_neighbor;
struct timeval *bc_time;
struct task bc_bfd_task;
struct task bc_bfd_send_task;
struct timeout bc_timo_rx;
struct timeout bc_timo_tx;
time_t bc_lastuptime;
int bc_laststate;
int bc_state;
int bc_mode;
int bc_poll;
int bc_error;
int bc_minrx;
int bc_mintx;
int bc_minecho;
int bc_multiplier;
};
struct sockaddr *bfd2sa(struct rtentry *, struct sockaddr_bfd *);
int bfdset(struct rtentry *);
void bfdclear(struct rtentry *);
void bfdinit(void);
#endif /* _KERNEL */
#endif /* _NET_BFD_H_ */
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