]>
Commit | Line | Data |
---|---|---|
50f34207 | 1 | /* |
2 | * MPLS definitions | |
3 | * Copyright 2015 Cumulus Networks, Inc. | |
4 | * | |
5 | * This file is part of GNU Zebra. | |
6 | * | |
7 | * GNU Zebra is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License as published | |
9 | * by the Free Software Foundation; either version 2, or (at your | |
10 | * option) any later version. | |
11 | * | |
12 | * GNU Zebra is distributed in the hope that it will be useful, but | |
13 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
15 | * General Public License for more details. | |
16 | * | |
17 | * You should have received a copy of the GNU General Public License | |
18 | * along with GNU Zebra; see the file COPYING. If not, write to the | |
19 | * Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
20 | * Boston, MA 02111-1307, USA. | |
21 | */ | |
22 | ||
23 | #ifndef _QUAGGA_MPLS_H | |
24 | #define _QUAGGA_MPLS_H | |
25 | ||
26 | /* Well-known MPLS label values (RFC 3032 etc). */ | |
27 | #define MPLS_V4_EXP_NULL_LABEL 0 | |
28 | #define MPLS_RA_LABEL 1 | |
29 | #define MPLS_V6_EXP_NULL_LABEL 2 | |
30 | #define MPLS_IMP_NULL_LABEL 3 | |
31 | #define MPLS_ENTROPY_LABEL_INDICATOR 7 | |
32 | #define MPLS_GAL_LABEL 13 | |
33 | #define MPLS_OAM_ALERT_LABEL 14 | |
34 | #define MPLS_EXTENSION_LABEL 15 | |
35 | ||
36 | /* Minimum and maximum label values */ | |
37 | #define MPLS_MIN_RESERVED_LABEL 0 | |
38 | #define MPLS_MAX_RESERVED_LABEL 15 | |
39 | #define MPLS_MIN_UNRESERVED_LABEL 16 | |
40 | #define MPLS_MAX_UNRESERVED_LABEL 1048575 | |
41 | ||
42 | #define IS_MPLS_RESERVED_LABEL(label) \ | |
43 | (label >= MPLS_MIN_RESERVED_LABEL && label <= MPLS_MAX_RESERVED_LABEL) | |
44 | ||
45 | #define IS_MPLS_UNRESERVED_LABEL(label) \ | |
46 | (label >= MPLS_MIN_UNRESERVED_LABEL && label <= MPLS_MAX_UNRESERVED_LABEL) | |
47 | ||
48 | /* Definitions for a MPLS label stack entry (RFC 3032). This encodes the | |
49 | * label, EXP, BOS and TTL fields. | |
50 | */ | |
51 | typedef unsigned int mpls_lse_t; | |
52 | ||
53 | #define MPLS_LS_LABEL_MASK 0xFFFFF000 | |
54 | #define MPLS_LS_LABEL_SHIFT 12 | |
55 | #define MPLS_LS_EXP_MASK 0x00000E00 | |
56 | #define MPLS_LS_EXP_SHIFT 9 | |
57 | #define MPLS_LS_S_MASK 0x00000100 | |
58 | #define MPLS_LS_S_SHIFT 8 | |
59 | #define MPLS_LS_TTL_MASK 0x000000FF | |
60 | #define MPLS_LS_TTL_SHIFT 0 | |
61 | ||
62 | #define MPLS_LABEL_VALUE(lse) \ | |
63 | ((lse & MPLS_LS_LABEL_MASK) >> MPLS_LS_LABEL_SHIFT) | |
64 | #define MPLS_LABEL_EXP(lse) \ | |
65 | ((lse & MPLS_LS_EXP_MASK) >> MPLS_LS_EXP_SHIFT) | |
66 | #define MPLS_LABEL_BOS(lse) \ | |
67 | ((lse & MPLS_LS_S_MASK) >> MPLS_LS_S_SHIFT) | |
68 | #define MPLS_LABEL_TTL(lse) \ | |
69 | ((lse & MPLS_LS_TTL_MASK) >> MPLS_LS_TTL_SHIFT) | |
70 | ||
71 | #define IS_MPLS_LABEL_BOS(ls) (MPLS_LABEL_BOS(ls) == 1) | |
72 | ||
73 | #define MPLS_LABEL_LEN_BITS 20 | |
74 | ||
75 | /* MPLS label value as a 32-bit (mostly we only care about the label value). */ | |
76 | typedef unsigned int mpls_label_t; | |
77 | ||
ce549947 | 78 | #define MPLS_NO_LABEL 0xFFFFFFFF |
50f34207 | 79 | #define MPLS_INVALID_LABEL 0xFFFFFFFF |
80 | ||
ce549947 RW |
81 | /* LSP types. */ |
82 | enum lsp_types_t | |
83 | { | |
84 | ZEBRA_LSP_NONE = 0, /* No LSP. */ | |
85 | ZEBRA_LSP_STATIC = 1, /* Static LSP. */ | |
86 | ZEBRA_LSP_LDP = 2 /* LDP LSP. */ | |
87 | }; | |
88 | ||
50f34207 | 89 | /* Functions for basic label operations. */ |
90 | ||
91 | /* Encode a label stack entry from fields; convert to network byte-order as | |
92 | * the Netlink interface expects MPLS labels to be in this format. | |
93 | */ | |
94 | static inline mpls_lse_t | |
95 | mpls_lse_encode (mpls_label_t label, u_int32_t ttl, | |
96 | u_int32_t exp, u_int32_t bos) | |
97 | { | |
98 | mpls_lse_t lse; | |
99 | lse = htonl ((label << MPLS_LS_LABEL_SHIFT) | | |
100 | (exp << MPLS_LS_EXP_SHIFT) | | |
101 | (bos ? (1 << MPLS_LS_S_SHIFT) : 0) | | |
102 | (ttl << MPLS_LS_TTL_SHIFT)); | |
103 | return lse; | |
104 | } | |
105 | ||
106 | /* Extract the fields from a label stack entry after converting to host-byte | |
107 | * order. This is expected to be called only for messages received over the | |
108 | * Netlink interface. | |
109 | */ | |
110 | static inline void | |
111 | mpls_lse_decode (mpls_lse_t lse, mpls_label_t *label, | |
112 | u_int32_t *ttl, u_int32_t *exp, u_int32_t *bos) | |
113 | { | |
114 | mpls_lse_t local_lse; | |
115 | ||
116 | local_lse = ntohl (lse); | |
117 | *label = MPLS_LABEL_VALUE(local_lse); | |
118 | *exp = MPLS_LABEL_EXP(local_lse); | |
119 | *bos = MPLS_LABEL_BOS(local_lse); | |
120 | *ttl = MPLS_LABEL_TTL(local_lse); | |
121 | } | |
122 | ||
123 | ||
124 | /* Printable string for labels (with consideration for reserved values). */ | |
125 | static inline char * | |
14878121 | 126 | label2str (mpls_label_t label, char *buf, size_t len) |
50f34207 | 127 | { |
128 | switch(label) { | |
129 | case MPLS_V4_EXP_NULL_LABEL: | |
14878121 | 130 | strlcpy(buf, "IPv4 Explicit Null", len); |
50f34207 | 131 | return(buf); |
50f34207 | 132 | case MPLS_RA_LABEL: |
14878121 | 133 | strlcpy(buf, "Router Alert", len); |
50f34207 | 134 | return(buf); |
50f34207 | 135 | case MPLS_V6_EXP_NULL_LABEL: |
14878121 | 136 | strlcpy(buf, "IPv6 Explict Null", len); |
50f34207 | 137 | return(buf); |
50f34207 | 138 | case MPLS_IMP_NULL_LABEL: |
14878121 | 139 | strlcpy(buf, "implicit-null", len); |
50f34207 | 140 | return(buf); |
50f34207 | 141 | case MPLS_ENTROPY_LABEL_INDICATOR: |
14878121 | 142 | strlcpy(buf, "Entropy Label Indicator", len); |
50f34207 | 143 | return(buf); |
50f34207 | 144 | case MPLS_GAL_LABEL: |
14878121 | 145 | strlcpy(buf, "Generic Associated Channel", len); |
50f34207 | 146 | return(buf); |
50f34207 | 147 | case MPLS_OAM_ALERT_LABEL: |
14878121 | 148 | strlcpy(buf, "OAM Alert", len); |
50f34207 | 149 | return(buf); |
50f34207 | 150 | case MPLS_EXTENSION_LABEL: |
14878121 | 151 | strlcpy(buf, "Extension", len); |
50f34207 | 152 | return(buf); |
50f34207 | 153 | default: |
14878121 DL |
154 | if (label < 16) |
155 | snprintf(buf, len, "Reserved (%u)", label); | |
156 | else | |
157 | snprintf(buf, len, "%u", label); | |
50f34207 | 158 | return(buf); |
159 | } | |
50f34207 | 160 | } |
161 | ||
eac6e3f0 RW |
162 | /* constants used by ldpd */ |
163 | #define MPLS_LABEL_IPV4NULL 0 /* IPv4 Explicit NULL Label */ | |
164 | #define MPLS_LABEL_RTALERT 1 /* Router Alert Label */ | |
165 | #define MPLS_LABEL_IPV6NULL 2 /* IPv6 Explicit NULL Label */ | |
166 | #define MPLS_LABEL_IMPLNULL 3 /* Implicit NULL Label */ | |
167 | /* MPLS_LABEL_RESERVED 4-15 */ /* Values 4-15 are reserved */ | |
168 | #define MPLS_LABEL_RESERVED_MAX 15 | |
169 | #define MPLS_LABEL_MAX ((1 << 20) - 1) | |
170 | ||
50f34207 | 171 | #endif |