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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 int bgp_reg_for_label_callback(mpls_label_t new_label
, void *labelid
,
35 extern void bgp_reg_dereg_for_label(struct bgp_dest
*dest
,
36 struct bgp_path_info
*pi
, bool reg
);
37 extern int bgp_parse_fec_update(void);
38 extern mpls_label_t
bgp_adv_label(struct bgp_dest
*dest
,
39 struct bgp_path_info
*pi
, struct peer
*to
,
40 afi_t afi
, safi_t safi
);
42 extern int bgp_nlri_parse_label(struct peer
*peer
, struct attr
*attr
,
43 struct bgp_nlri
*packet
);
45 static inline int bgp_labeled_safi(safi_t safi
)
47 /* NOTE: This API really says a label (tag) MAY be present. Not all EVPN
48 * routes will have a label.
50 if ((safi
== SAFI_LABELED_UNICAST
) || (safi
== SAFI_MPLS_VPN
)
51 || (safi
== SAFI_EVPN
))
56 static inline int bgp_is_withdraw_label(mpls_label_t
*label
)
58 uint8_t *pkt
= (uint8_t *)label
;
60 /* The check on pkt[2] for 0x00 or 0x02 is in case bgp_set_valid_label()
61 * was called on the withdraw label */
62 if (((pkt
[0] == 0x80) || (pkt
[0] == 0x00)) && (pkt
[1] == 0x00)
63 && ((pkt
[2] == 0x00) || (pkt
[2] == 0x02)))
68 static inline int bgp_is_valid_label(mpls_label_t
*label
)
70 uint8_t *t
= (uint8_t *)label
;
76 static inline void bgp_set_valid_label(mpls_label_t
*label
)
78 uint8_t *t
= (uint8_t *)label
;
83 static inline void bgp_unset_valid_label(mpls_label_t
*label
)
85 uint8_t *t
= (uint8_t *)label
;
90 static inline void bgp_register_for_label(struct bgp_dest
*dest
,
91 struct bgp_path_info
*pi
)
93 bgp_reg_dereg_for_label(dest
, pi
, true);
96 static inline void bgp_unregister_for_label(struct bgp_dest
*dest
)
98 bgp_reg_dereg_for_label(dest
, NULL
, false);
101 /* Label stream to value */
102 static inline uint32_t label_pton(mpls_label_t
*label
)
104 uint8_t *t
= (uint8_t *)label
;
105 return ((((unsigned int)t
[0]) << 12) | (((unsigned int)t
[1]) << 4)
106 | ((unsigned int)((t
[2] & 0xF0) >> 4)));
109 /* Encode label values */
110 static inline void label_ntop(uint32_t l
, int bos
, mpls_label_t
*label
)
112 uint8_t *t
= (uint8_t *)label
;
113 t
[0] = ((l
& 0x000FF000) >> 12);
114 t
[1] = ((l
& 0x00000FF0) >> 4);
115 t
[2] = ((l
& 0x0000000F) << 4);
120 /* Return BOS value of label stream */
121 static inline uint8_t label_bos(mpls_label_t
*label
)
123 uint8_t *t
= (uint8_t *)label
;
124 return (t
[2] & 0x01);
127 #endif /* _BGP_LABEL_H */