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/* $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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