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git.proxmox.com Git - mirror_frr.git/blob - bgpd/bgp_label.h
1 /* BGP carrying Label information
2 * Copyright (C) 2013 Cumulus Networks, Inc.
4 * This file is part of GNU Zebra.
6 * GNU Zebra is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License as published by the
8 * Free Software Foundation; either version 2, or (at your option) any
11 * GNU Zebra is distributed in the hope that it will be useful, but
12 * WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * General Public License for more details.
16 * You should have received a copy of the GNU General Public License along
17 * with this program; see the file COPYING; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
24 #define BGP_LABEL_BYTES 3
25 #define BGP_LABEL_BITS 24
26 #define BGP_WITHDRAW_LABEL 0x800000
27 #define BGP_PREVENT_VRF_2_VRF_LEAK 0xFFFFFFFE
33 extern void bgp_reg_dereg_for_label(struct bgp_node
*rn
,
34 struct bgp_path_info
*pi
, int reg
);
35 extern int bgp_parse_fec_update(void);
36 extern mpls_label_t
bgp_adv_label(struct bgp_node
*rn
, struct bgp_path_info
*pi
,
37 struct peer
*to
, afi_t afi
, safi_t safi
);
39 extern int bgp_nlri_parse_label(struct peer
*peer
, struct attr
*attr
,
40 struct bgp_nlri
*packet
);
42 static inline int bgp_labeled_safi(safi_t safi
)
44 /* NOTE: This API really says a label (tag) MAY be present. Not all EVPN
45 * routes will have a label.
47 if ((safi
== SAFI_LABELED_UNICAST
) || (safi
== SAFI_MPLS_VPN
)
48 || (safi
== SAFI_EVPN
))
53 static inline int bgp_is_withdraw_label(mpls_label_t
*label
)
55 uint8_t *pkt
= (uint8_t *)label
;
57 /* The check on pkt[2] for 0x00 or 0x02 is in case bgp_set_valid_label()
58 * was called on the withdraw label */
59 if ((pkt
[0] == 0x80) && (pkt
[1] == 0x00)
60 && ((pkt
[2] == 0x00) || (pkt
[2] == 0x02)))
65 static inline int bgp_is_valid_label(mpls_label_t
*label
)
67 uint8_t *t
= (uint8_t *)label
;
73 static inline void bgp_set_valid_label(mpls_label_t
*label
)
75 uint8_t *t
= (uint8_t *)label
;
80 static inline void bgp_unset_valid_label(mpls_label_t
*label
)
82 uint8_t *t
= (uint8_t *)label
;
87 static inline void bgp_register_for_label(struct bgp_node
*rn
,
88 struct bgp_path_info
*pi
)
90 bgp_reg_dereg_for_label(rn
, pi
, 1);
93 static inline void bgp_unregister_for_label(struct bgp_node
*rn
)
95 bgp_reg_dereg_for_label(rn
, NULL
, 0);
98 /* Label stream to value */
99 static inline uint32_t label_pton(mpls_label_t
*label
)
101 uint8_t *t
= (uint8_t *)label
;
102 return ((((unsigned int)t
[0]) << 12) | (((unsigned int)t
[1]) << 4)
103 | ((unsigned int)((t
[2] & 0xF0) >> 4)));
106 /* Encode label values */
107 static inline void label_ntop(uint32_t l
, int bos
, mpls_label_t
*label
)
109 uint8_t *t
= (uint8_t *)label
;
110 t
[0] = ((l
& 0x000FF000) >> 12);
111 t
[1] = ((l
& 0x00000FF0) >> 4);
112 t
[2] = ((l
& 0x0000000F) << 4);
117 /* Return BOS value of label stream */
118 static inline uint8_t label_bos(mpls_label_t
*label
)
120 uint8_t *t
= (uint8_t *)label
;
121 return (t
[2] & 0x01);
124 #endif /* _BGP_LABEL_H */