6e4cb2b9ab
CAN stands for Controller Area Network, a broadcast network used in automation and automotive fields. For example, the NMEA2000 standard developped for marine devices uses a CAN network as the link layer. This is an implementation of the linux socketcan API: https://www.kernel.org/doc/Documentation/networking/can.txt you can also see can(4). This adds a new socket family (AF_CAN) and protocol (PF_CAN), as well as the canconfig(8) utility, used to set timing parameter of CAN hardware. Also inclued is a driver for the CAN controller found in the allwinner A20 SoC (I tested it with an Olimex lime2 board, connected with PIC18-based CAN devices). There is also the canloop(4) pseudo-device, which allows to use the socketcan API without CAN hardware. At this time the CANFD part of the linux socketcan API is not implemented. Error frames are not implemented either. But I could get the cansend and canreceive utilities from the canutils package to build and run with minimal changes. tcpudmp(8) can also be used to record frames, which can be decoded with etherreal.
114 lines
3.9 KiB
C
114 lines
3.9 KiB
C
/* $NetBSD: can_pcb.h,v 1.2 2017/05/27 21:02:56 bouyer Exp $ */
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/*-
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* Copyright (c) 2003, 2017 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Robert Swindells and Manuel Bouyer
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef _NETCAN_CAN_PCB_H_
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#define _NETCAN_CAN_PCB_H_
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#include <sys/queue.h>
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/*
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* Common structure pcb for can protocol implementation.
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* Here are stored pointers to local and foreign host table
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* entries, local and foreign socket numbers, and pointers
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* up (to a socket structure) and down (to a protocol-specific)
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* control block.
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*/
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struct canpcbpolicy;
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struct canpcb {
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LIST_ENTRY(canpcb) canp_hash;
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LIST_ENTRY(canpcb) canp_lhash;
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TAILQ_ENTRY(canpcb) canp_queue;
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kmutex_t canp_mtx; /* protect states and refcount */
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int canp_state;
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int canp_flags;
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struct socket *canp_socket; /* back pointer to socket */
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struct ifnet *canp_ifp; /* interface this socket is bound to */
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struct canpcbtable *canp_table;
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struct can_filter *canp_filters; /* filter array */
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int canp_nfilters; /* size of canp_filters */
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int canp_refcount;
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};
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LIST_HEAD(canpcbhead, canpcb);
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TAILQ_HEAD(canpcbqueue, canpcb);
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struct canpcbtable {
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struct canpcbqueue canpt_queue;
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struct canpcbhead *canpt_bindhashtbl;
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struct canpcbhead *canpt_connecthashtbl;
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u_long canpt_bindhash;
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u_long canpt_connecthash;
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};
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/* states in canp_state: */
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#define CANP_DETACHED 0
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#define CANP_ATTACHED 1
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#define CANP_BOUND 2
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#define CANP_CONNECTED 3
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/* flags in canp_flags: */
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#define CANP_NO_LOOPBACK 0x0001 /* local loopback disabled */
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#define CANP_RECEIVE_OWN 0x0002 /* receive own message */
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#define sotocanpcb(so) ((struct canpcb *)(so)->so_pcb)
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#ifdef _KERNEL
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void can_losing(struct canpcb *);
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int can_pcballoc (struct socket *, void *);
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int can_pcbbind(void *, struct sockaddr_can *, struct lwp *);
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int can_pcbconnect(void *, struct sockaddr_can *);
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void can_pcbdetach(void *);
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void can_pcbdisconnect(void *);
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void can_pcbinit(struct canpcbtable *, int, int);
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int can_pcbnotify(struct canpcbtable *, u_int32_t,
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u_int32_t, int, void (*)(struct canpcb *, int));
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void can_pcbnotifyall(struct canpcbtable *, u_int32_t, int,
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void (*)(struct canpcb *, int));
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void can_pcbpurgeif0(struct canpcbtable *, struct ifnet *);
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void can_pcbpurgeif(struct canpcbtable *, struct ifnet *);
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void can_pcbstate(struct canpcb *, int);
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void can_setsockaddr(struct canpcb *, struct sockaddr_can *);
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int can_pcbsetfilter(struct canpcb *, struct can_filter *, int);
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bool can_pcbfilter(struct canpcb *, struct mbuf *);
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/* refcount management */
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void canp_ref(struct canpcb *);
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void canp_unref(struct canpcb *);
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#endif
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#endif /* _NETCAN_CAN_PCB_H_ */
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