FreeBSD/Linux Kernel Cross Reference
sys/netmpls/mpls.h

     /*      $OpenBSD: mpls.h,v 1.46 2021/05/25 22:45:10 bluhm Exp $ */
     
     /*
      * Copyright (C) 1999, 2000 and 2001 AYAME Project, WIDE Project.
      * All rights reserved.
      *
      * Redistribution and use in source and binary forms, with or without
      * modification, are permitted provided that the following conditions
      * are met:
     *
     * 1. Redistributions of source code must retain the above copyright
     *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     * 3. Neither the name of the project nor the names of its contributors
     *    may be used to endorse or promote products derived from this software
     *    without specific prior written permission.
     *
     * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
     * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULARPURPOSE 
     * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 
     * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, ORCONSEQUENTIAL 
     * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 
     * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 
     * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 
     * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 
     * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 
     * SUCH DAMAGE.
     */
    
    #ifndef _NETMPLS_MPLS_H_
    #define _NETMPLS_MPLS_H_
    
    /*
     * Structure of a SHIM header.
     */
    #define MPLS_LABEL_MAX          ((1 << 20) - 1)
    
    struct shim_hdr {
            u_int32_t shim_label;   /* 20 bit label, 4 bit exp & BoS, 8 bit TTL */
    };
    
    #define MPLS_HDRLEN     sizeof(struct shim_hdr)
    
    /*
     * By byte-swapping the constants, we avoid ever having to byte-swap IP
     * addresses inside the kernel.  Unfortunately, user-level programs rely
     * on these macros not doing byte-swapping.
     */
    
    #ifdef _KERNEL
    #define __MADDR(x)     ((u_int32_t)htonl((u_int32_t)(x)))
    #else
    #define __MADDR(x)     ((u_int32_t)(x))
    #endif
    
    #define MPLS_LABEL_MASK         __MADDR(0xfffff000U)
    #define MPLS_LABEL_OFFSET       12
    #define MPLS_EXP_MASK           __MADDR(0x00000e00U)
    #define MPLS_EXP_OFFSET         9
    #define MPLS_BOS_MASK           __MADDR(0x00000100U)
    #define MPLS_BOS_OFFSET         8
    #define MPLS_TTL_MASK           __MADDR(0x000000ffU)
    
    #define CW_ZERO_MASK            __MADDR(0xf0000000U)
    #define CW_FRAG_MASK            __MADDR(0x00300000U)
    
    #define MPLS_BOS_ISSET(l)       (((l) & MPLS_BOS_MASK) == MPLS_BOS_MASK)
    
    /* Reserved label values (RFC3032) */
    #define MPLS_LABEL_IPV4NULL     0               /* IPv4 Explicit NULL Label */
    #define MPLS_LABEL_RTALERT      1               /* Router Alert Label       */
    #define MPLS_LABEL_IPV6NULL     2               /* IPv6 Explicit NULL Label */
    #define MPLS_LABEL_IMPLNULL     3               /* Implicit NULL Label      */
    /*      MPLS_LABEL_RESERVED     4-15 */         /* Values 4-15 are reserved */
    #define MPLS_LABEL_RESERVED_MAX 15
    
    /*
     * Socket address
     */
    
    struct sockaddr_mpls {
            u_int8_t        smpls_len;              /* length */
            u_int8_t        smpls_family;           /* AF_MPLS */
            u_int16_t       smpls_pad0;
            u_int32_t       smpls_label;            /* MPLS label */
            u_int32_t       smpls_pad1[2];
    };
    
    struct rt_mpls {
            u_int32_t       mpls_label;
            u_int8_t        mpls_operation;
            u_int8_t        mpls_exp;
    };
    
    #define MPLS_OP_LOCAL           0x0
    #define MPLS_OP_POP             0x1
   #define MPLS_OP_PUSH            0x2
   #define MPLS_OP_SWAP            0x4
   
   #define MPLS_INKERNEL_LOOP_MAX  16
   
   #define satosmpls(sa)           ((struct sockaddr_mpls *)(sa))
   #define smplstosa(smpls)        ((struct sockaddr *)(smpls))
   
   /*
    * Names for MPLS sysctl objects
    */
   #define MPLSCTL_ENABLE                  1
   #define MPLSCTL_DEFTTL                  2
   #define MPLSCTL_MAPTTL_IP               5
   #define MPLSCTL_MAPTTL_IP6              6
   #define MPLSCTL_MAXID                   7       
   
   #define MPLSCTL_NAMES { \
           { NULL, 0 }, \
           { NULL, 0 }, \
           { "ttl", CTLTYPE_INT }, \
           { "ifq", CTLTYPE_NODE },\
           { NULL, 0 }, \
           { "mapttl_ip", CTLTYPE_INT }, \
           { "mapttl_ip6", CTLTYPE_INT } \
   }
   
   #define IMR_TYPE_NONE                   0
   #define IMR_TYPE_ETHERNET               1
   #define IMR_TYPE_ETHERNET_TAGGED        2
   
   #define IMR_FLAG_CONTROLWORD            0x1
   
   struct ifmpwreq {
           uint32_t        imr_flags;
           uint32_t        imr_type; /* pseudowire type */
           struct          shim_hdr imr_lshim; /* local label */
           struct          shim_hdr imr_rshim; /* remote label */
           struct          sockaddr_storage imr_nexthop;
   };
   
   #endif
   
   #ifdef _KERNEL
   
   #define MPLS_LABEL2SHIM(_l)     (htonl((_l) << MPLS_LABEL_OFFSET))
   #define MPLS_SHIM2LABEL(_s)     (ntohl((_s)) >> MPLS_LABEL_OFFSET)
   
   extern int              mpls_defttl;
   extern int              mpls_mapttl_ip;
   extern int              mpls_mapttl_ip6;
   
   
   struct mbuf     *mpls_shim_pop(struct mbuf *);
   struct mbuf     *mpls_shim_swap(struct mbuf *, struct rt_mpls *);
   struct mbuf     *mpls_shim_push(struct mbuf *, struct rt_mpls *);
   
   struct mbuf     *mpls_ip_adjttl(struct mbuf *, u_int8_t);
   #ifdef INET6
   struct mbuf     *mpls_ip6_adjttl(struct mbuf *, u_int8_t);
   #endif
   
   int              mpls_output(struct ifnet *, struct mbuf *, struct sockaddr *,
                       struct rtentry *);
   void             mpls_input(struct ifnet *, struct mbuf *);
   
   #endif /* _KERNEL */

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