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718e3744 | 1 | /* |
2 | * OSPF Sending and Receiving OSPF Packets. | |
3 | * Copyright (C) 1999 Toshiaki Takada | |
4 | * | |
5 | * This file is part of GNU Zebra. | |
6 | * | |
7 | * GNU Zebra is free software; you can redistribute it and/or modify it | |
8 | * under the terms of the GNU General Public License as published by the | |
9 | * Free Software Foundation; either version 2, or (at your option) any | |
10 | * 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 Free | |
19 | * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA | |
20 | * 02111-1307, USA. | |
21 | */ | |
22 | ||
23 | #ifndef _ZEBRA_OSPF_PACKET_H | |
24 | #define _ZEBRA_OSPF_PACKET_H | |
25 | ||
6c835671 | 26 | #define OSPF_HEADER_SIZE 24U |
27 | #define OSPF_AUTH_SIMPLE_SIZE 8U | |
28 | #define OSPF_AUTH_MD5_SIZE 16U | |
718e3744 | 29 | |
6c835671 | 30 | #define OSPF_MAX_PACKET_SIZE 65535U /* includes IP Header size. */ |
31 | #define OSPF_HELLO_MIN_SIZE 20U /* not including neighbors */ | |
32 | #define OSPF_DB_DESC_MIN_SIZE 8U | |
33 | #define OSPF_LS_REQ_MIN_SIZE 0U | |
34 | #define OSPF_LS_UPD_MIN_SIZE 4U | |
35 | #define OSPF_LS_ACK_MIN_SIZE 0U | |
718e3744 | 36 | |
37 | #define OSPF_MSG_HELLO 1 /* OSPF Hello Message. */ | |
38 | #define OSPF_MSG_DB_DESC 2 /* OSPF Database Descriptoin Message. */ | |
39 | #define OSPF_MSG_LS_REQ 3 /* OSPF Link State Request Message. */ | |
40 | #define OSPF_MSG_LS_UPD 4 /* OSPF Link State Update Message. */ | |
41 | #define OSPF_MSG_LS_ACK 5 /* OSPF Link State Acknoledgement Message. */ | |
42 | ||
43 | #define OSPF_SEND_PACKET_DIRECT 1 | |
44 | #define OSPF_SEND_PACKET_INDIRECT 2 | |
718e3744 | 45 | #define OSPF_SEND_PACKET_LOOP 3 |
718e3744 | 46 | |
47 | #define OSPF_HELLO_REPLY_DELAY 1 | |
48 | ||
49 | struct ospf_packet | |
50 | { | |
51 | struct ospf_packet *next; | |
52 | ||
53 | /* Pointer to data stream. */ | |
54 | struct stream *s; | |
55 | ||
56 | /* IP destination address. */ | |
57 | struct in_addr dst; | |
58 | ||
59 | /* OSPF packet length. */ | |
60 | u_int16_t length; | |
61 | }; | |
62 | ||
63 | /* OSPF packet queue structure. */ | |
64 | struct ospf_fifo | |
65 | { | |
66 | unsigned long count; | |
67 | ||
68 | struct ospf_packet *head; | |
69 | struct ospf_packet *tail; | |
70 | }; | |
71 | ||
72 | /* OSPF packet header structure. */ | |
73 | struct ospf_header | |
74 | { | |
75 | u_char version; /* OSPF Version. */ | |
76 | u_char type; /* Packet Type. */ | |
77 | u_int16_t length; /* Packet Length. */ | |
78 | struct in_addr router_id; /* Router ID. */ | |
79 | struct in_addr area_id; /* Area ID. */ | |
80 | u_int16_t checksum; /* Check Sum. */ | |
81 | u_int16_t auth_type; /* Authentication Type. */ | |
82 | /* Authentication Data. */ | |
83 | union | |
84 | { | |
85 | /* Simple Authentication. */ | |
86 | u_char auth_data [OSPF_AUTH_SIMPLE_SIZE]; | |
87 | /* Cryptographic Authentication. */ | |
88 | struct | |
89 | { | |
90 | u_int16_t zero; /* Should be 0. */ | |
91 | u_char key_id; /* Key ID. */ | |
92 | u_char auth_data_len; /* Auth Data Length. */ | |
93 | u_int32_t crypt_seqnum; /* Cryptographic Sequence Number. */ | |
94 | } crypt; | |
95 | } u; | |
96 | }; | |
97 | ||
98 | /* OSPF Hello body format. */ | |
99 | struct ospf_hello | |
100 | { | |
101 | struct in_addr network_mask; | |
102 | u_int16_t hello_interval; | |
103 | u_char options; | |
104 | u_char priority; | |
105 | u_int32_t dead_interval; | |
106 | struct in_addr d_router; | |
107 | struct in_addr bd_router; | |
108 | struct in_addr neighbors[1]; | |
109 | }; | |
110 | ||
111 | /* OSPF Database Description body format. */ | |
112 | struct ospf_db_desc | |
113 | { | |
114 | u_int16_t mtu; | |
115 | u_char options; | |
116 | u_char flags; | |
117 | u_int32_t dd_seqnum; | |
118 | }; | |
119 | ||
120 | ||
121 | /* Macros. */ | |
86f1fd96 | 122 | /* XXX Perhaps obsolete; function in ospf_packet.c */ |
718e3744 | 123 | #define OSPF_PACKET_MAX(oi) ospf_packet_max (oi) |
718e3744 | 124 | |
125 | #define OSPF_OUTPUT_PNT(S) ((S)->data + (S)->putp) | |
126 | #define OSPF_OUTPUT_LENGTH(S) ((S)->endp) | |
127 | ||
128 | #define IS_SET_DD_MS(X) ((X) & OSPF_DD_FLAG_MS) | |
129 | #define IS_SET_DD_M(X) ((X) & OSPF_DD_FLAG_M) | |
130 | #define IS_SET_DD_I(X) ((X) & OSPF_DD_FLAG_I) | |
131 | #define IS_SET_DD_ALL(X) ((X) & OSPF_DD_FLAG_ALL) | |
132 | ||
133 | /* Prototypes. */ | |
4dadc291 | 134 | extern void ospf_output_forward (struct stream *, int); |
135 | extern struct ospf_packet *ospf_packet_new (size_t); | |
136 | extern void ospf_packet_free (struct ospf_packet *); | |
137 | extern struct ospf_fifo *ospf_fifo_new (void); | |
138 | extern void ospf_fifo_push (struct ospf_fifo *, struct ospf_packet *); | |
139 | extern struct ospf_packet *ospf_fifo_pop (struct ospf_fifo *); | |
140 | extern struct ospf_packet *ospf_fifo_head (struct ospf_fifo *); | |
141 | extern void ospf_fifo_flush (struct ospf_fifo *); | |
142 | extern void ospf_fifo_free (struct ospf_fifo *); | |
143 | extern void ospf_packet_add (struct ospf_interface *, struct ospf_packet *); | |
144 | extern void ospf_packet_delete (struct ospf_interface *); | |
145 | extern struct stream *ospf_stream_dup (struct stream *); | |
146 | extern struct ospf_packet *ospf_packet_dup (struct ospf_packet *); | |
147 | ||
148 | extern int ospf_read (struct thread *); | |
149 | extern void ospf_hello_send (struct ospf_interface *); | |
150 | extern void ospf_db_desc_send (struct ospf_neighbor *); | |
151 | extern void ospf_db_desc_resend (struct ospf_neighbor *); | |
152 | extern void ospf_ls_req_send (struct ospf_neighbor *); | |
153 | extern void ospf_ls_upd_send_lsa (struct ospf_neighbor *, struct ospf_lsa *, | |
154 | int); | |
155 | extern void ospf_ls_upd_send (struct ospf_neighbor *, struct list *, int); | |
156 | extern void ospf_ls_ack_send (struct ospf_neighbor *, struct ospf_lsa *); | |
157 | extern void ospf_ls_ack_send_delayed (struct ospf_interface *); | |
158 | extern void ospf_ls_retransmit (struct ospf_interface *, struct ospf_lsa *); | |
159 | extern void ospf_ls_req_event (struct ospf_neighbor *); | |
160 | ||
161 | extern int ospf_ls_upd_timer (struct thread *); | |
162 | extern int ospf_ls_ack_timer (struct thread *); | |
163 | extern int ospf_poll_timer (struct thread *); | |
164 | extern int ospf_hello_reply_timer (struct thread *); | |
165 | extern void ospf_hello_send_sub (struct ospf_interface *, struct in_addr *); | |
718e3744 | 166 | |
167 | #endif /* _ZEBRA_OSPF_PACKET_H */ |