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      1 /*	$NetBSD: mpls.h,v 1.2 2016/10/08 20:19:37 joerg Exp $ */
      2 
      3 /*-
      4  * Copyright (c) 2010 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Mihai Chelaru <kefren (at) NetBSD.org>
      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  *
     19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     29  * POSSIBILITY OF SUCH DAMAGE.
     30  */
     31 
     32 #ifndef _NETMPLS_MPLS_H_
     33 #define _NETMPLS_MPLS_H_
     34 
     35 #include <sys/param.h>
     36 #include <sys/time.h>
     37 #include <sys/proc.h>
     38 #include <sys/queue.h>
     39 
     40 #include <net/if.h>
     41 #include <net/if_dl.h>
     42 
     43 #define MPLS_LABEL_IPV4NULL	0	/* IPv4 Explicit NULL Label	*/
     44 #define MPLS_LABEL_RTALERT	1	/* Router Alert Label		*/
     45 #define MPLS_LABEL_IPV6NULL	2	/* IPv6 Explicit NULL Label	*/
     46 #define MPLS_LABEL_IMPLNULL	3	/* Implicit NULL Label		*/
     47 #define MPLS_LABEL_RESMAX	15	/* Maximum reserved Label	*/
     48 
     49 union mpls_shim {
     50 	uint32_t s_addr;		/* the whole shim */
     51 	struct {
     52 #if BYTE_ORDER == LITTLE_ENDIAN
     53 		uint32_t ttl:8;
     54 		uint32_t bos:1;
     55 		uint32_t exp:3;
     56 		uint32_t label:20;
     57 #else
     58 		uint32_t label:20;
     59 		uint32_t exp:3;
     60 		uint32_t bos:1;
     61 		uint32_t ttl:8;
     62 #endif
     63 	} shim;
     64 };
     65 
     66 struct sockaddr_mpls {
     67 	uint8_t smpls_len;
     68 	uint8_t smpls_family;
     69 	uint8_t smpls_pad[2];
     70 	union mpls_shim smpls_addr;
     71 };
     72 __CTASSERT(sizeof(struct sockaddr_mpls) == 8);
     73 
     74 #endif /* !_NETMPLS_MPLS_H_ */
     75