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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 GNU Zebra; see the file COPYING. If not, write to the Free
* Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
* 02111-1307, 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 u_char * 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)
{
if ((safi == SAFI_LABELED_UNICAST) || (safi == SAFI_MPLS_VPN))
return 1;
return 0;
}
static inline int
bgp_is_withdraw_label (u_char *pkt)
{
if ((pkt[0] == 0x80) && (pkt[1] == 0x00) && (pkt[2] == 0x00))
return 1;
return 0;
}
static inline u_char *
bgp_encode_withdraw_label (u_char *pkt)
{
*pkt++ = 0x80; *pkt++ = 0x00; *pkt++ = 0x00;
return pkt;
}
static inline int
bgp_is_valid_label (u_char *t)
{
if (!t)
return 0;
return (t[2] & 0x02);
}
static inline void
bgp_set_valid_label (u_char *t)
{
if (t)
t[2] |= 0x02;
}
static inline void
bgp_unset_valid_label (u_char *t)
{
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 (u_char t[])
{
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, u_char t[])
{
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 (u_char t[])
{
return (t[2] & 0x01);
};
#endif /* _BGP_LABEL_H */
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