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Quagga: Basic definitions for MPLS
Signed-off-by: Vivek Venkatraman <vivek@cumulusnetworks.com> Reviewed-by: Donald Sharp <sharpd@cumulusnetworks.com> Ticket: CM-4804, ... Reviewed By: CCR-3083 Testing Done: Not relevant
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vivek
Donald Sharp
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172
lib/mpls.h
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172
lib/mpls.h
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/*
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* MPLS definitions
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* Copyright 2015 Cumulus Networks, Inc.
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*
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* This file is part of GNU Zebra.
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*
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* GNU Zebra is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published
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* by the Free Software Foundation; either version 2, or (at your
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* option) any later version.
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*
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* GNU Zebra is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with GNU Zebra; see the file COPYING. If not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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#ifndef _QUAGGA_MPLS_H
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#define _QUAGGA_MPLS_H
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/* Well-known MPLS label values (RFC 3032 etc). */
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#define MPLS_V4_EXP_NULL_LABEL 0
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#define MPLS_RA_LABEL 1
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#define MPLS_V6_EXP_NULL_LABEL 2
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#define MPLS_IMP_NULL_LABEL 3
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#define MPLS_ENTROPY_LABEL_INDICATOR 7
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#define MPLS_GAL_LABEL 13
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#define MPLS_OAM_ALERT_LABEL 14
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#define MPLS_EXTENSION_LABEL 15
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/* Minimum and maximum label values */
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#define MPLS_MIN_RESERVED_LABEL 0
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#define MPLS_MAX_RESERVED_LABEL 15
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#define MPLS_MIN_UNRESERVED_LABEL 16
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#define MPLS_MAX_UNRESERVED_LABEL 1048575
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#define IS_MPLS_RESERVED_LABEL(label) \
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(label >= MPLS_MIN_RESERVED_LABEL && label <= MPLS_MAX_RESERVED_LABEL)
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#define IS_MPLS_UNRESERVED_LABEL(label) \
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(label >= MPLS_MIN_UNRESERVED_LABEL && label <= MPLS_MAX_UNRESERVED_LABEL)
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/* Definitions for a MPLS label stack entry (RFC 3032). This encodes the
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* label, EXP, BOS and TTL fields.
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*/
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typedef unsigned int mpls_lse_t;
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#define MPLS_LS_LABEL_MASK 0xFFFFF000
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#define MPLS_LS_LABEL_SHIFT 12
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#define MPLS_LS_EXP_MASK 0x00000E00
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#define MPLS_LS_EXP_SHIFT 9
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#define MPLS_LS_S_MASK 0x00000100
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#define MPLS_LS_S_SHIFT 8
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#define MPLS_LS_TTL_MASK 0x000000FF
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#define MPLS_LS_TTL_SHIFT 0
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#define MPLS_LABEL_VALUE(lse) \
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((lse & MPLS_LS_LABEL_MASK) >> MPLS_LS_LABEL_SHIFT)
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#define MPLS_LABEL_EXP(lse) \
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((lse & MPLS_LS_EXP_MASK) >> MPLS_LS_EXP_SHIFT)
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#define MPLS_LABEL_BOS(lse) \
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((lse & MPLS_LS_S_MASK) >> MPLS_LS_S_SHIFT)
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#define MPLS_LABEL_TTL(lse) \
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((lse & MPLS_LS_TTL_MASK) >> MPLS_LS_TTL_SHIFT)
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#define IS_MPLS_LABEL_BOS(ls) (MPLS_LABEL_BOS(ls) == 1)
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#define MPLS_LABEL_LEN_BITS 20
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/* MPLS label value as a 32-bit (mostly we only care about the label value). */
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typedef unsigned int mpls_label_t;
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#define MPLS_INVALID_LABEL 0xFFFFFFFF
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/* Functions for basic label operations. */
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/* Encode a label stack entry from fields; convert to network byte-order as
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* the Netlink interface expects MPLS labels to be in this format.
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*/
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static inline mpls_lse_t
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mpls_lse_encode (mpls_label_t label, u_int32_t ttl,
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u_int32_t exp, u_int32_t bos)
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{
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mpls_lse_t lse;
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lse = htonl ((label << MPLS_LS_LABEL_SHIFT) |
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(exp << MPLS_LS_EXP_SHIFT) |
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(bos ? (1 << MPLS_LS_S_SHIFT) : 0) |
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(ttl << MPLS_LS_TTL_SHIFT));
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return lse;
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}
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/* Extract the fields from a label stack entry after converting to host-byte
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* order. This is expected to be called only for messages received over the
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* Netlink interface.
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*/
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static inline void
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mpls_lse_decode (mpls_lse_t lse, mpls_label_t *label,
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u_int32_t *ttl, u_int32_t *exp, u_int32_t *bos)
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{
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mpls_lse_t local_lse;
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local_lse = ntohl (lse);
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*label = MPLS_LABEL_VALUE(local_lse);
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*exp = MPLS_LABEL_EXP(local_lse);
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*bos = MPLS_LABEL_BOS(local_lse);
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*ttl = MPLS_LABEL_TTL(local_lse);
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}
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/* Printable string for labels (with consideration for reserved values). */
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static inline char *
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label2str (mpls_label_t label, char *buf, int len)
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{
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switch(label) {
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case MPLS_V4_EXP_NULL_LABEL:
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strncpy(buf, "IPv4 Explicit Null", len);
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return(buf);
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break;
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case MPLS_RA_LABEL:
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strncpy(buf, "Router Alert", len);
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return(buf);
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break;
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case MPLS_V6_EXP_NULL_LABEL:
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strncpy(buf, "IPv6 Explict Null", len);
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return(buf);
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break;
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case MPLS_IMP_NULL_LABEL:
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strncpy(buf, "implicit-null", len);
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return(buf);
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break;
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case MPLS_ENTROPY_LABEL_INDICATOR:
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strncpy(buf, "Entropy Label Indicator", len);
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return(buf);
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break;
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case MPLS_GAL_LABEL:
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strncpy(buf, "Generic Associated Channel", len);
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return(buf);
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break;
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case MPLS_OAM_ALERT_LABEL:
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strncpy(buf, "OAM Alert", len);
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return(buf);
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break;
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case MPLS_EXTENSION_LABEL:
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strncpy(buf, "Extension", len);
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return(buf);
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break;
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case 4:
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case 5:
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case 6:
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case 8:
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case 9:
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case 10:
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case 11:
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case 12:
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strncpy(buf, "Reserved", len);
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return(buf);
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break;
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default:
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sprintf(buf, "%u", label);
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return(buf);
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}
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strncpy(buf, "Error", len);
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return(buf);
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}
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#endif
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