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/* BGP carrying Label information
* Copyright (C) 2013 Cumulus Networks, Inc.
*
* This file is part of GNU Zebra.
*
* GNU Zebra is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2, or (at your option) any
* later version.
*
* GNU Zebra is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; see the file COPYING; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifndef _BGP_LABEL_H
#define _BGP_LABEL_H
#define BGP_LABEL_BYTES 3
#define BGP_LABEL_BITS 24
#define BGP_WITHDRAW_LABEL 0x800000
struct bgp_node;
struct bgp_info;
struct peer;
extern void bgp_reg_dereg_for_label (struct bgp_node *rn, struct bgp_info *ri,
int reg);
extern int bgp_parse_fec_update(void);
extern mpls_label_t bgp_adv_label(struct bgp_node *rn, struct bgp_info *ri,
struct peer *to, afi_t afi, safi_t safi);
extern int bgp_nlri_parse_label (struct peer *peer, struct attr *attr,
struct bgp_nlri *packet);
static inline int
bgp_labeled_safi (safi_t safi)
{
/* NOTE: This API really says a label (tag) MAY be present. Not all EVPN
* routes will have a label.
*/
if ((safi == SAFI_LABELED_UNICAST) || (safi == SAFI_MPLS_VPN) ||
(safi == SAFI_EVPN))
return 1;
return 0;
}
static inline int
bgp_is_withdraw_label (mpls_label_t *label)
{
u_char *pkt = (u_char *) label;
/* The check on pkt[2] for 0x00 or 0x02 is in case bgp_set_valid_label()
* was called on the withdraw label */
if ((pkt[0] == 0x80) && (pkt[1] == 0x00) && ((pkt[2] == 0x00) || (pkt[2] == 0x02)))
return 1;
return 0;
}
static inline int
bgp_is_valid_label (mpls_label_t *label)
{
u_char *t= (u_char *) label;
if (!t)
return 0;
return (t[2] & 0x02);
}
static inline void
bgp_set_valid_label (mpls_label_t *label)
{
u_char *t= (u_char *) label;
if (t)
t[2] |= 0x02;
}
static inline void
bgp_unset_valid_label (mpls_label_t *label)
{
u_char *t= (u_char *) label;
if (t)
t[2] &= ~0x02;
}
static inline void
bgp_register_for_label (struct bgp_node *rn, struct bgp_info *ri)
{
bgp_reg_dereg_for_label (rn, ri, 1);
}
static inline void
bgp_unregister_for_label (struct bgp_node *rn)
{
bgp_reg_dereg_for_label (rn, NULL, 0);
}
/* Label stream to value */
static inline u_int32_t
label_pton (mpls_label_t *label)
{
u_char *t= (u_char *) label;
return ((((unsigned int) t[0]) << 12) | (((unsigned int) t[1]) << 4) |
((unsigned int) ((t[2] & 0xF0) >> 4)));
}
/* Encode label values */
static inline void
label_ntop (u_int32_t l, int bos, mpls_label_t *label)
{
u_char *t= (u_char *) label;
t[0] = ((l & 0x000FF000) >> 12);
t[1] = ((l & 0x00000FF0) >> 4);
t[2] = ((l & 0x0000000F) << 4);
if (bos)
t[2] |= 0x01;
}
/* Return BOS value of label stream */
static inline u_char
label_bos (mpls_label_t *label)
{
u_char *t= (u_char *) label;
return (t[2] & 0x01);
};
#endif /* _BGP_LABEL_H */
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