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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 | * | |
896014f4 DL |
17 | * You should have received a copy of the GNU General Public License along |
18 | * with this program; see the file COPYING; if not, write to the Free Software | |
19 | * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
50f34207 | 20 | */ |
21 | ||
22 | #ifndef _QUAGGA_MPLS_H | |
23 | #define _QUAGGA_MPLS_H | |
24 | ||
fea12efb | 25 | #include <arpa/inet.h> |
26 | ||
50f34207 | 27 | /* Well-known MPLS label values (RFC 3032 etc). */ |
28 | #define MPLS_V4_EXP_NULL_LABEL 0 | |
29 | #define MPLS_RA_LABEL 1 | |
30 | #define MPLS_V6_EXP_NULL_LABEL 2 | |
31 | #define MPLS_IMP_NULL_LABEL 3 | |
32 | #define MPLS_ENTROPY_LABEL_INDICATOR 7 | |
33 | #define MPLS_GAL_LABEL 13 | |
34 | #define MPLS_OAM_ALERT_LABEL 14 | |
35 | #define MPLS_EXTENSION_LABEL 15 | |
36 | ||
37 | /* Minimum and maximum label values */ | |
38 | #define MPLS_MIN_RESERVED_LABEL 0 | |
39 | #define MPLS_MAX_RESERVED_LABEL 15 | |
40 | #define MPLS_MIN_UNRESERVED_LABEL 16 | |
41 | #define MPLS_MAX_UNRESERVED_LABEL 1048575 | |
42 | ||
43 | #define IS_MPLS_RESERVED_LABEL(label) \ | |
44 | (label >= MPLS_MIN_RESERVED_LABEL && label <= MPLS_MAX_RESERVED_LABEL) | |
45 | ||
46 | #define IS_MPLS_UNRESERVED_LABEL(label) \ | |
47 | (label >= MPLS_MIN_UNRESERVED_LABEL && label <= MPLS_MAX_UNRESERVED_LABEL) | |
48 | ||
49 | /* Definitions for a MPLS label stack entry (RFC 3032). This encodes the | |
50 | * label, EXP, BOS and TTL fields. | |
51 | */ | |
52 | typedef unsigned int mpls_lse_t; | |
53 | ||
54 | #define MPLS_LS_LABEL_MASK 0xFFFFF000 | |
55 | #define MPLS_LS_LABEL_SHIFT 12 | |
56 | #define MPLS_LS_EXP_MASK 0x00000E00 | |
57 | #define MPLS_LS_EXP_SHIFT 9 | |
58 | #define MPLS_LS_S_MASK 0x00000100 | |
59 | #define MPLS_LS_S_SHIFT 8 | |
60 | #define MPLS_LS_TTL_MASK 0x000000FF | |
61 | #define MPLS_LS_TTL_SHIFT 0 | |
62 | ||
63 | #define MPLS_LABEL_VALUE(lse) \ | |
64 | ((lse & MPLS_LS_LABEL_MASK) >> MPLS_LS_LABEL_SHIFT) | |
65 | #define MPLS_LABEL_EXP(lse) \ | |
66 | ((lse & MPLS_LS_EXP_MASK) >> MPLS_LS_EXP_SHIFT) | |
67 | #define MPLS_LABEL_BOS(lse) \ | |
68 | ((lse & MPLS_LS_S_MASK) >> MPLS_LS_S_SHIFT) | |
69 | #define MPLS_LABEL_TTL(lse) \ | |
70 | ((lse & MPLS_LS_TTL_MASK) >> MPLS_LS_TTL_SHIFT) | |
71 | ||
72 | #define IS_MPLS_LABEL_BOS(ls) (MPLS_LABEL_BOS(ls) == 1) | |
73 | ||
74 | #define MPLS_LABEL_LEN_BITS 20 | |
75 | ||
76 | /* MPLS label value as a 32-bit (mostly we only care about the label value). */ | |
77 | typedef unsigned int mpls_label_t; | |
78 | ||
ce549947 | 79 | #define MPLS_NO_LABEL 0xFFFFFFFF |
50f34207 | 80 | #define MPLS_INVALID_LABEL 0xFFFFFFFF |
81 | ||
ce549947 RW |
82 | /* LSP types. */ |
83 | enum lsp_types_t | |
84 | { | |
85 | ZEBRA_LSP_NONE = 0, /* No LSP. */ | |
86 | ZEBRA_LSP_STATIC = 1, /* Static LSP. */ | |
a64448ba DS |
87 | ZEBRA_LSP_LDP = 2, /* LDP LSP. */ |
88 | ZEBRA_LSP_BGP = 3 /* BGP LSP. */ | |
ce549947 RW |
89 | }; |
90 | ||
50f34207 | 91 | /* Functions for basic label operations. */ |
92 | ||
93 | /* Encode a label stack entry from fields; convert to network byte-order as | |
94 | * the Netlink interface expects MPLS labels to be in this format. | |
95 | */ | |
96 | static inline mpls_lse_t | |
97 | mpls_lse_encode (mpls_label_t label, u_int32_t ttl, | |
98 | u_int32_t exp, u_int32_t bos) | |
99 | { | |
100 | mpls_lse_t lse; | |
101 | lse = htonl ((label << MPLS_LS_LABEL_SHIFT) | | |
102 | (exp << MPLS_LS_EXP_SHIFT) | | |
103 | (bos ? (1 << MPLS_LS_S_SHIFT) : 0) | | |
104 | (ttl << MPLS_LS_TTL_SHIFT)); | |
105 | return lse; | |
106 | } | |
107 | ||
108 | /* Extract the fields from a label stack entry after converting to host-byte | |
109 | * order. This is expected to be called only for messages received over the | |
110 | * Netlink interface. | |
111 | */ | |
112 | static inline void | |
113 | mpls_lse_decode (mpls_lse_t lse, mpls_label_t *label, | |
114 | u_int32_t *ttl, u_int32_t *exp, u_int32_t *bos) | |
115 | { | |
116 | mpls_lse_t local_lse; | |
117 | ||
118 | local_lse = ntohl (lse); | |
119 | *label = MPLS_LABEL_VALUE(local_lse); | |
120 | *exp = MPLS_LABEL_EXP(local_lse); | |
121 | *bos = MPLS_LABEL_BOS(local_lse); | |
122 | *ttl = MPLS_LABEL_TTL(local_lse); | |
123 | } | |
124 | ||
28d58fd7 VV |
125 | /* Invalid label index value (when used with BGP Prefix-SID). Should |
126 | * match the BGP definition. | |
127 | */ | |
128 | #define MPLS_INVALID_LABEL_INDEX 0xFFFFFFFF | |
129 | ||
50f34207 | 130 | |
131 | /* Printable string for labels (with consideration for reserved values). */ | |
132 | static inline char * | |
14878121 | 133 | label2str (mpls_label_t label, char *buf, size_t len) |
50f34207 | 134 | { |
135 | switch(label) { | |
136 | case MPLS_V4_EXP_NULL_LABEL: | |
14878121 | 137 | strlcpy(buf, "IPv4 Explicit Null", len); |
50f34207 | 138 | return(buf); |
50f34207 | 139 | case MPLS_RA_LABEL: |
14878121 | 140 | strlcpy(buf, "Router Alert", len); |
50f34207 | 141 | return(buf); |
50f34207 | 142 | case MPLS_V6_EXP_NULL_LABEL: |
14878121 | 143 | strlcpy(buf, "IPv6 Explict Null", len); |
50f34207 | 144 | return(buf); |
50f34207 | 145 | case MPLS_IMP_NULL_LABEL: |
14878121 | 146 | strlcpy(buf, "implicit-null", len); |
50f34207 | 147 | return(buf); |
50f34207 | 148 | case MPLS_ENTROPY_LABEL_INDICATOR: |
14878121 | 149 | strlcpy(buf, "Entropy Label Indicator", len); |
50f34207 | 150 | return(buf); |
50f34207 | 151 | case MPLS_GAL_LABEL: |
14878121 | 152 | strlcpy(buf, "Generic Associated Channel", len); |
50f34207 | 153 | return(buf); |
50f34207 | 154 | case MPLS_OAM_ALERT_LABEL: |
14878121 | 155 | strlcpy(buf, "OAM Alert", len); |
50f34207 | 156 | return(buf); |
50f34207 | 157 | case MPLS_EXTENSION_LABEL: |
14878121 | 158 | strlcpy(buf, "Extension", len); |
50f34207 | 159 | return(buf); |
50f34207 | 160 | default: |
14878121 DL |
161 | if (label < 16) |
162 | snprintf(buf, len, "Reserved (%u)", label); | |
163 | else | |
164 | snprintf(buf, len, "%u", label); | |
50f34207 | 165 | return(buf); |
166 | } | |
50f34207 | 167 | } |
168 | ||
eac6e3f0 RW |
169 | /* constants used by ldpd */ |
170 | #define MPLS_LABEL_IPV4NULL 0 /* IPv4 Explicit NULL Label */ | |
171 | #define MPLS_LABEL_RTALERT 1 /* Router Alert Label */ | |
172 | #define MPLS_LABEL_IPV6NULL 2 /* IPv6 Explicit NULL Label */ | |
173 | #define MPLS_LABEL_IMPLNULL 3 /* Implicit NULL Label */ | |
174 | /* MPLS_LABEL_RESERVED 4-15 */ /* Values 4-15 are reserved */ | |
175 | #define MPLS_LABEL_RESERVED_MAX 15 | |
176 | #define MPLS_LABEL_MAX ((1 << 20) - 1) | |
177 | ||
50f34207 | 178 | #endif |