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eb5d44eb | 1 | /* |
2 | * IS-IS Rout(e)ing protocol - isis_pdu.h | |
3 | * PDU processing | |
4 | * | |
5 | * Copyright (C) 2001,2002 Sampo Saaristo | |
6 | * Tampere University of Technology | |
7 | * Institute of Communications Engineering | |
8 | * | |
9 | * This program is free software; you can redistribute it and/or modify it | |
10 | * under the terms of the GNU General Public Licenseas published by the Free | |
11 | * Software Foundation; either version 2 of the License, or (at your option) | |
12 | * any later version. | |
13 | * | |
14 | * This program is distributed in the hope that it will be useful,but WITHOUT | |
15 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
16 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
17 | * more details. | |
18 | ||
19 | * You should have received a copy of the GNU General Public License along | |
20 | * with this program; if not, write to the Free Software Foundation, Inc., | |
21 | * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. | |
22 | */ | |
23 | ||
24 | #ifndef _ZEBRA_ISIS_PDU_H | |
25 | #define _ZEBRA_ISIS_PDU_H | |
26 | ||
238497fc PJ |
27 | #ifdef __SUNPRO_C |
28 | #pragma pack(1) | |
29 | #endif | |
30 | ||
eb5d44eb | 31 | /* |
32 | * ISO 9542 - 7.5,7.6 | |
33 | * | |
34 | * ES to IS Fixed Header | |
35 | * +-------+-------+-------+-------+-------+-------+-------+-------+ | |
36 | * | Intradomain Routeing Protocol Discriminator | | |
37 | * +-------+-------+-------+-------+-------+-------+-------+-------+ | |
38 | * | Length Indicator | | |
39 | * +-------+-------+-------+-------+-------+-------+-------+-------+ | |
40 | * | Version/Protocol ID extension | | |
41 | * +-------+-------+-------+-------+-------+-------+-------+-------+ | |
42 | * | Reserved = 0 | | |
43 | * +-------+-------+-------+-------+-------+-------+-------+-------+ | |
44 | * | 0 | 0 | 0 | PDU Type | | |
45 | * +-------+-------+-------+-------+-------+-------+-------+-------+ | |
46 | * | Holding Time | 2 | |
47 | * +-------+-------+-------+-------+-------+-------+-------+-------+ | |
48 | * | Checksum | 2 | |
49 | * +-------+-------+-------+-------+-------+-------+-------+-------+ | |
50 | */ | |
51 | ||
52 | struct esis_fixed_hdr | |
53 | { | |
54 | u_char idrp; | |
55 | u_char length; | |
56 | u_char version; | |
57 | u_char id_len; | |
58 | u_char pdu_type; | |
59 | u_int16_t holdtime; | |
60 | u_int16_t checksum; | |
f390d2c7 | 61 | } __attribute__ ((packed)); |
eb5d44eb | 62 | |
63 | #define ESIS_FIXED_HDR_LEN 9 | |
64 | ||
65 | #define ESH_PDU 2 | |
66 | #define ISH_PDU 4 | |
67 | #define RD_PDU 5 | |
68 | ||
69 | /* | |
70 | * IS to IS Fixed Header | |
71 | * +-------+-------+-------+-------+-------+-------+-------+-------+ | |
72 | * | Intradomain Routeing Protocol Discriminator | | |
73 | * +-------+-------+-------+-------+-------+-------+-------+-------+ | |
74 | * | Length Indicator | | |
75 | * +-------+-------+-------+-------+-------+-------+-------+-------+ | |
76 | * | Version/Protocol ID extension | | |
77 | * +-------+-------+-------+-------+-------+-------+-------+-------+ | |
78 | * | R | R | R | PDU Type | | |
79 | * +-------+-------+-------+-------+-------+-------+-------+-------+ | |
80 | * | Version | | |
81 | * +-------+-------+-------+-------+-------+-------+-------+-------+ | |
82 | * | Reserved | | |
83 | * +-------+-------+-------+-------+-------+-------+-------+-------+ | |
84 | * | Maximum Area Addresses | | |
85 | * +-------+-------+-------+-------+-------+-------+-------+-------+ | |
86 | */ | |
87 | ||
f390d2c7 | 88 | struct isis_fixed_hdr |
eb5d44eb | 89 | { |
90 | u_char idrp; | |
91 | u_char length; | |
92 | u_char version1; | |
93 | u_char id_len; | |
94 | u_char pdu_type; | |
95 | u_char version2; | |
96 | u_char reserved; | |
97 | u_char max_area_addrs; | |
3f045a08 | 98 | } __attribute__ ((packed)); |
eb5d44eb | 99 | |
100 | #define ISIS_FIXED_HDR_LEN 8 | |
101 | ||
102 | /* | |
103 | * IS-IS PDU types. | |
104 | */ | |
105 | ||
106 | #define L1_LAN_HELLO 15 | |
107 | #define L2_LAN_HELLO 16 | |
108 | /* | |
109 | * L1 and L2 LAN IS to IS Hello PDU header | |
110 | * +-------+-------+-------+-------+-------+-------+-------+-------+ | |
111 | * | Reserved | Circuit Type | 1 | |
112 | * +-------+-------+-------+-------+-------+-------+-------+-------+ | |
113 | * + Source ID + id_len | |
114 | * +-------+-------+-------+-------+-------+-------+-------+-------+ | |
115 | * | Holding Time | 2 | |
116 | * +-------+-------+-------+-------+-------+-------+-------+-------+ | |
e38e0df0 | 117 | * | PDU Length | 2 |
eb5d44eb | 118 | * +-------+-------+-------+-------+-------+-------+-------+-------+ |
119 | * | R | Priority | 1 | |
120 | * +-------+-------+-------+-------+-------+-------+-------+-------+ | |
121 | * | LAN ID | id_len + 1 | |
122 | * +-------+-------+-------+-------+-------+-------+-------+-------+ | |
123 | */ | |
f390d2c7 | 124 | struct isis_lan_hello_hdr |
125 | { | |
126 | u_char circuit_t; | |
127 | u_char source_id[ISIS_SYS_ID_LEN]; | |
128 | u_int16_t hold_time; | |
129 | u_int16_t pdu_len; | |
130 | u_char prio; | |
131 | u_char lan_id[ISIS_SYS_ID_LEN + 1]; | |
132 | } __attribute__ ((packed)); | |
eb5d44eb | 133 | #define ISIS_LANHELLO_HDRLEN 19 |
134 | ||
135 | #define P2P_HELLO 17 | |
136 | /* | |
137 | * Point-to-point IS to IS hello PDU header | |
138 | * +-------+-------+-------+-------+-------+-------+-------+-------+ | |
139 | * | Reserved | Circuit Type | 1 | |
140 | * +-------+-------+-------+-------+-------+-------+-------+-------+ | |
141 | * + Source ID + id_len | |
142 | * +-------+-------+-------+-------+-------+-------+-------+-------+ | |
143 | * + Holding Time + 2 | |
144 | * +-------+-------+-------+-------+-------+-------+-------+-------+ | |
e38e0df0 | 145 | * + PDU Length + 2 |
eb5d44eb | 146 | * +-------+-------+-------+-------+-------+-------+-------+-------+ |
147 | * | Local Circuit ID | 1 | |
148 | * +-------+-------+-------+-------+-------+-------+-------+-------+ | |
149 | */ | |
f390d2c7 | 150 | struct isis_p2p_hello_hdr |
151 | { | |
152 | u_char circuit_t; | |
153 | u_char source_id[ISIS_SYS_ID_LEN]; | |
154 | u_int16_t hold_time; | |
155 | u_int16_t pdu_len; | |
eb5d44eb | 156 | u_char local_id; |
f390d2c7 | 157 | } __attribute__ ((packed)); |
eb5d44eb | 158 | #define ISIS_P2PHELLO_HDRLEN 12 |
159 | ||
160 | #define L1_LINK_STATE 18 | |
161 | #define L2_LINK_STATE 20 | |
162 | /* | |
163 | * L1 and L2 IS to IS link state PDU header | |
164 | * +-------+-------+-------+-------+-------+-------+-------+-------+ | |
165 | * + PDU Length + 2 | |
166 | * +-------+-------+-------+-------+-------+-------+-------+-------+ | |
167 | * + Remaining Lifetime + 2 | |
168 | * +-------+-------+-------+-------+-------+-------+-------+-------+ | |
169 | * | LSP ID | id_len + 2 | |
170 | * +-------+-------+-------+-------+-------+-------+-------+-------+ | |
171 | * + Sequence Number + 4 | |
172 | * +-------+-------+-------+-------+-------+-------+-------+-------+ | |
173 | * + Checksum + 2 | |
174 | * +-------+-------+-------+-------+-------+-------+-------+-------+ | |
175 | * | P | ATT |LSPDBOL| ISTYPE | | |
176 | * +-------+-------+-------+-------+-------+-------+-------+-------+ | |
177 | */ | |
f390d2c7 | 178 | struct isis_link_state_hdr |
179 | { | |
180 | u_int16_t pdu_len; | |
eb5d44eb | 181 | u_int16_t rem_lifetime; |
f390d2c7 | 182 | u_char lsp_id[ISIS_SYS_ID_LEN + 2]; |
eb5d44eb | 183 | u_int32_t seq_num; |
184 | u_int16_t checksum; | |
f390d2c7 | 185 | u_int8_t lsp_bits; |
186 | } __attribute__ ((packed)); | |
eb5d44eb | 187 | #define ISIS_LSP_HDR_LEN 19 |
188 | ||
3f045a08 JB |
189 | /* |
190 | * Since the length field of LSP Entries TLV is one byte long, and each LSP | |
191 | * entry is LSP_ENTRIES_LEN (16) bytes long, the maximum number of LSP entries | |
192 | * can be accomodated in a TLV is | |
193 | * 255 / 16 = 15. | |
194 | * | |
195 | * Therefore, the maximum length of the LSP Entries TLV is | |
196 | * 16 * 15 + 2 (header) = 242 bytes. | |
197 | */ | |
198 | #define MAX_LSP_ENTRIES_TLV_SIZE 242 | |
199 | ||
eb5d44eb | 200 | #define L1_COMPLETE_SEQ_NUM 24 |
201 | #define L2_COMPLETE_SEQ_NUM 25 | |
202 | /* | |
203 | * L1 and L2 IS to IS complete sequence numbers PDU header | |
204 | * +-------+-------+-------+-------+-------+-------+-------+-------+ | |
e38e0df0 | 205 | * + PDU Length + 2 |
eb5d44eb | 206 | * +-------+-------+-------+-------+-------+-------+-------+-------+ |
207 | * + Source ID + id_len + 1 | |
208 | * +-------+-------+-------+-------+-------+-------+-------+-------+ | |
209 | * + Start LSP ID + id_len + 2 | |
210 | * +-------+-------+-------+-------+-------+-------+-------+-------+ | |
211 | * + End LSP ID + id_len + 2 | |
212 | * +-------+-------+-------+-------+-------+-------+-------+-------+ | |
213 | */ | |
f390d2c7 | 214 | struct isis_complete_seqnum_hdr |
215 | { | |
eb5d44eb | 216 | u_int16_t pdu_len; |
f390d2c7 | 217 | u_char source_id[ISIS_SYS_ID_LEN + 1]; |
218 | u_char start_lsp_id[ISIS_SYS_ID_LEN + 2]; | |
219 | u_char stop_lsp_id[ISIS_SYS_ID_LEN + 2]; | |
eb5d44eb | 220 | }; |
221 | #define ISIS_CSNP_HDRLEN 25 | |
222 | ||
223 | #define L1_PARTIAL_SEQ_NUM 26 | |
224 | #define L2_PARTIAL_SEQ_NUM 27 | |
225 | /* | |
226 | * L1 and L2 IS to IS partial sequence numbers PDU header | |
227 | * +-------+-------+-------+-------+-------+-------+-------+-------+ | |
228 | * + PDU Length + 2 | |
229 | * +-------+-------+-------+-------+-------+-------+-------+-------+ | |
230 | * + Source ID + id_len + 1 | |
231 | * +---------------------------------------------------------------+ | |
232 | */ | |
f390d2c7 | 233 | struct isis_partial_seqnum_hdr |
234 | { | |
eb5d44eb | 235 | u_int16_t pdu_len; |
f390d2c7 | 236 | u_char source_id[ISIS_SYS_ID_LEN + 1]; |
eb5d44eb | 237 | }; |
238 | #define ISIS_PSNP_HDRLEN 9 | |
239 | ||
238497fc PJ |
240 | #ifdef __SUNPRO_C |
241 | #pragma pack() | |
242 | #endif | |
243 | ||
eb5d44eb | 244 | /* |
245 | * Function for receiving IS-IS PDUs | |
246 | */ | |
247 | int isis_receive (struct thread *thread); | |
248 | ||
249 | /* | |
250 | * calling arguments for snp_process () | |
251 | */ | |
252 | #define ISIS_SNP_PSNP_FLAG 0 | |
253 | #define ISIS_SNP_CSNP_FLAG 1 | |
254 | ||
3f045a08 JB |
255 | #define ISIS_AUTH_MD5_SIZE 16U |
256 | ||
eb5d44eb | 257 | /* |
258 | * Sending functions | |
259 | */ | |
f390d2c7 | 260 | int send_lan_l1_hello (struct thread *thread); |
261 | int send_lan_l2_hello (struct thread *thread); | |
262 | int send_p2p_hello (struct thread *thread); | |
263 | int send_csnp (struct isis_circuit *circuit, int level); | |
264 | int send_l1_csnp (struct thread *thread); | |
265 | int send_l2_csnp (struct thread *thread); | |
266 | int send_l1_psnp (struct thread *thread); | |
267 | int send_l2_psnp (struct thread *thread); | |
268 | int send_lsp (struct thread *thread); | |
269 | int ack_lsp (struct isis_link_state_hdr *hdr, | |
270 | struct isis_circuit *circuit, int level); | |
271 | void fill_fixed_hdr (struct isis_fixed_hdr *hdr, u_char pdu_type); | |
272 | int send_hello (struct isis_circuit *circuit, int level); | |
eb5d44eb | 273 | |
eb5d44eb | 274 | #endif /* _ZEBRA_ISIS_PDU_H */ |