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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
27/*
28 * ISO 9542 - 7.5,7.6
29 *
30 * ES to IS Fixed Header
31 * +-------+-------+-------+-------+-------+-------+-------+-------+
32 * | Intradomain Routeing Protocol Discriminator |
33 * +-------+-------+-------+-------+-------+-------+-------+-------+
34 * | Length Indicator |
35 * +-------+-------+-------+-------+-------+-------+-------+-------+
36 * | Version/Protocol ID extension |
37 * +-------+-------+-------+-------+-------+-------+-------+-------+
38 * | Reserved = 0 |
39 * +-------+-------+-------+-------+-------+-------+-------+-------+
40 * | 0 | 0 | 0 | PDU Type |
41 * +-------+-------+-------+-------+-------+-------+-------+-------+
42 * | Holding Time | 2
43 * +-------+-------+-------+-------+-------+-------+-------+-------+
44 * | Checksum | 2
45 * +-------+-------+-------+-------+-------+-------+-------+-------+
46 */
47
48struct esis_fixed_hdr
49{
50 u_char idrp;
51 u_char length;
52 u_char version;
53 u_char id_len;
54 u_char pdu_type;
55 u_int16_t holdtime;
56 u_int16_t checksum;
57} __attribute__((packed));
58
59#define ESIS_FIXED_HDR_LEN 9
60
61#define ESH_PDU 2
62#define ISH_PDU 4
63#define RD_PDU 5
64
65/*
66 * IS to IS Fixed Header
67 * +-------+-------+-------+-------+-------+-------+-------+-------+
68 * | Intradomain Routeing Protocol Discriminator |
69 * +-------+-------+-------+-------+-------+-------+-------+-------+
70 * | Length Indicator |
71 * +-------+-------+-------+-------+-------+-------+-------+-------+
72 * | Version/Protocol ID extension |
73 * +-------+-------+-------+-------+-------+-------+-------+-------+
74 * | R | R | R | PDU Type |
75 * +-------+-------+-------+-------+-------+-------+-------+-------+
76 * | Version |
77 * +-------+-------+-------+-------+-------+-------+-------+-------+
78 * | Reserved |
79 * +-------+-------+-------+-------+-------+-------+-------+-------+
80 * | Maximum Area Addresses |
81 * +-------+-------+-------+-------+-------+-------+-------+-------+
82 */
83
84struct isis_fixed_hdr
85{
86 u_char idrp;
87 u_char length;
88 u_char version1;
89 u_char id_len;
90 u_char pdu_type;
91 u_char version2;
92 u_char reserved;
93 u_char max_area_addrs;
94};
95
96#define ISIS_FIXED_HDR_LEN 8
97
98/*
99 * IS-IS PDU types.
100 */
101
102#define L1_LAN_HELLO 15
103#define L2_LAN_HELLO 16
104/*
105 * L1 and L2 LAN IS to IS Hello PDU header
106 * +-------+-------+-------+-------+-------+-------+-------+-------+
107 * | Reserved | Circuit Type | 1
108 * +-------+-------+-------+-------+-------+-------+-------+-------+
109 * + Source ID + id_len
110 * +-------+-------+-------+-------+-------+-------+-------+-------+
111 * | Holding Time | 2
112 * +-------+-------+-------+-------+-------+-------+-------+-------+
113 * | PDU Lenght | 2
114 * +-------+-------+-------+-------+-------+-------+-------+-------+
115 * | R | Priority | 1
116 * +-------+-------+-------+-------+-------+-------+-------+-------+
117 * | LAN ID | id_len + 1
118 * +-------+-------+-------+-------+-------+-------+-------+-------+
119 */
120struct isis_lan_hello_hdr {
121 u_char circuit_t;
122 u_char source_id[ISIS_SYS_ID_LEN];
123 u_int16_t hold_time;
124 u_int16_t pdu_len;
125 u_char prio;
126 u_char lan_id[ISIS_SYS_ID_LEN + 1];
127} __attribute__((packed));
128#define ISIS_LANHELLO_HDRLEN 19
129
130#define P2P_HELLO 17
131/*
132 * Point-to-point IS to IS hello PDU header
133 * +-------+-------+-------+-------+-------+-------+-------+-------+
134 * | Reserved | Circuit Type | 1
135 * +-------+-------+-------+-------+-------+-------+-------+-------+
136 * + Source ID + id_len
137 * +-------+-------+-------+-------+-------+-------+-------+-------+
138 * + Holding Time + 2
139 * +-------+-------+-------+-------+-------+-------+-------+-------+
140 * + PDU Lenght + 2
141 * +-------+-------+-------+-------+-------+-------+-------+-------+
142 * | Local Circuit ID | 1
143 * +-------+-------+-------+-------+-------+-------+-------+-------+
144 */
145struct isis_p2p_hello_hdr {
146 u_char circuit_t;
147 u_char source_id[ISIS_SYS_ID_LEN];
148 u_int16_t hold_time;
149 u_int16_t pdu_len;
150 u_char local_id;
151} __attribute__((packed));
152#define ISIS_P2PHELLO_HDRLEN 12
153
154#define L1_LINK_STATE 18
155#define L2_LINK_STATE 20
156/*
157 * L1 and L2 IS to IS link state PDU header
158 * +-------+-------+-------+-------+-------+-------+-------+-------+
159 * + PDU Length + 2
160 * +-------+-------+-------+-------+-------+-------+-------+-------+
161 * + Remaining Lifetime + 2
162 * +-------+-------+-------+-------+-------+-------+-------+-------+
163 * | LSP ID | id_len + 2
164 * +-------+-------+-------+-------+-------+-------+-------+-------+
165 * + Sequence Number + 4
166 * +-------+-------+-------+-------+-------+-------+-------+-------+
167 * + Checksum + 2
168 * +-------+-------+-------+-------+-------+-------+-------+-------+
169 * | P | ATT |LSPDBOL| ISTYPE |
170 * +-------+-------+-------+-------+-------+-------+-------+-------+
171 */
172struct isis_link_state_hdr {
173 u_int16_t pdu_len;
174 u_int16_t rem_lifetime;
175 u_char lsp_id[ISIS_SYS_ID_LEN + 2];
176 u_int32_t seq_num;
177 u_int16_t checksum;
178 u_int8_t lsp_bits;
179} __attribute__((packed));
180#define ISIS_LSP_HDR_LEN 19
181
182#define L1_COMPLETE_SEQ_NUM 24
183#define L2_COMPLETE_SEQ_NUM 25
184/*
185 * L1 and L2 IS to IS complete sequence numbers PDU header
186 * +-------+-------+-------+-------+-------+-------+-------+-------+
187 * + PDU Lenght + 2
188 * +-------+-------+-------+-------+-------+-------+-------+-------+
189 * + Source ID + id_len + 1
190 * +-------+-------+-------+-------+-------+-------+-------+-------+
191 * + Start LSP ID + id_len + 2
192 * +-------+-------+-------+-------+-------+-------+-------+-------+
193 * + End LSP ID + id_len + 2
194 * +-------+-------+-------+-------+-------+-------+-------+-------+
195 */
196struct isis_complete_seqnum_hdr {
197 u_int16_t pdu_len;
198 u_char source_id[ISIS_SYS_ID_LEN + 1];
199 u_char start_lsp_id[ISIS_SYS_ID_LEN + 2];
200 u_char stop_lsp_id[ISIS_SYS_ID_LEN + 2];
201};
202#define ISIS_CSNP_HDRLEN 25
203
204#define L1_PARTIAL_SEQ_NUM 26
205#define L2_PARTIAL_SEQ_NUM 27
206/*
207 * L1 and L2 IS to IS partial sequence numbers PDU header
208 * +-------+-------+-------+-------+-------+-------+-------+-------+
209 * + PDU Length + 2
210 * +-------+-------+-------+-------+-------+-------+-------+-------+
211 * + Source ID + id_len + 1
212 * +---------------------------------------------------------------+
213 */
214struct isis_partial_seqnum_hdr {
215 u_int16_t pdu_len;
216 u_char source_id[ISIS_SYS_ID_LEN + 1];
217};
218#define ISIS_PSNP_HDRLEN 9
219
220/*
221 * Function for receiving IS-IS PDUs
222 */
223int isis_receive (struct thread *thread);
224
225/*
226 * calling arguments for snp_process ()
227 */
228#define ISIS_SNP_PSNP_FLAG 0
229#define ISIS_SNP_CSNP_FLAG 1
230
231/*
232 * Sending functions
233 */
234int send_lan_l1_hello (struct thread *thread);
235int send_lan_l2_hello (struct thread *thread);
236int send_p2p_hello (struct thread *thread);
237int send_csnp (struct isis_circuit *circuit, int level);
238int send_l1_csnp (struct thread *thread);
239int send_l2_csnp (struct thread *thread);
240int send_l1_psnp (struct thread *thread);
241int send_l2_psnp (struct thread *thread);
242int send_lsp (struct thread *thread);
243int ack_lsp (struct isis_link_state_hdr *hdr,
244 struct isis_circuit *circuit, int level);
245void fill_fixed_hdr (struct isis_fixed_hdr *hdr, u_char pdu_type);
246int send_hello (struct isis_circuit *circuit, int level);
247
248
249int authentication_check (struct isis_passwd *one,
250 struct isis_passwd *theother);
251
252#endif /* _ZEBRA_ISIS_PDU_H */
253
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