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      1 /*-
      2  * Copyright (c) 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997
      3  *	The Regents of the University of California.  All rights reserved.
      4  *
      5  * This code is derived from the Stanford/CMU enet packet filter,
      6  * (net/enet.c) distributed as part of 4.3BSD, and code contributed
      7  * to Berkeley by Steven McCanne and Van Jacobson both of Lawrence
      8  * Berkeley Laboratory.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  * 3. All advertising materials mentioning features or use of this software
     19  *    must display the following acknowledgement:
     20  *      This product includes software developed by the University of
     21  *      California, Berkeley and its contributors.
     22  * 4. Neither the name of the University nor the names of its contributors
     23  *    may be used to endorse or promote products derived from this software
     24  *    without specific prior written permission.
     25  *
     26  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     27  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     28  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     29  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     30  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     31  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     32  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     33  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     34  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     35  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     36  * SUCH DAMAGE.
     37  */
     38 
     39 #ifndef lib_pcap_can_socketcan_h
     40 #define lib_pcap_can_socketcan_h
     41 
     42 #include <pcap/pcap-inttypes.h>
     43 
     44 /*
     45  * SocketCAN header for CAN and CAN FD frames, as per
     46  * Documentation/networking/can.rst in the Linux source.
     47  */
     48 typedef struct {
     49 	uint32_t can_id;
     50 	uint8_t payload_length;
     51 	uint8_t fd_flags;
     52 	uint8_t reserved1;
     53 	uint8_t reserved2;
     54 } pcap_can_socketcan_hdr;
     55 
     56 /* Bits in the fd_flags field */
     57 #define CANFD_BRS   0x01 /* bit rate switch (second bitrate for payload data) */
     58 #define CANFD_ESI   0x02 /* error state indicator of the transmitting node */
     59 #define CANFD_FDF   0x04 /* mark CAN FD for dual use of CAN format */
     60 
     61 /*
     62  * SocketCAN header for CAN XL frames, as per Linux's can.h header.
     63  * This is different from pcap_can_socketcan_hdr; the flags field
     64  * overlaps with the payload_length field in pcap_can_socketcan_hdr -
     65  * the payload_length field in a CAN or CAN FD frame never has the
     66  * 0x80 bit set, and the flags field in a CAN XL frame always has
     67  * it set, allowing code reading the frame to determine whether
     68  * it's CAN XL or not.
     69  */
     70 typedef struct {
     71 	uint32_t priority_vcid;
     72 	uint8_t flags;
     73 	uint8_t sdu_type;
     74 	uint16_t payload_length;
     75 	uint32_t acceptance_field;
     76 } pcap_can_socketcan_xl_hdr;
     77 
     78 /* Bits in the flags field */
     79 #define CANXL_SEC   0x01 /* Simple Extended Context */
     80 #define CANXL_XLF   0x80 /* mark to distinguish CAN XL from CAN/CAN FD frames */
     81 
     82 #endif
     83