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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 | * | |
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 | |
718e3744 | 20 | */ |
21 | ||
22 | #ifndef _ZEBRA_OSPF_PACKET_H | |
23 | #define _ZEBRA_OSPF_PACKET_H | |
24 | ||
6c835671 | 25 | #define OSPF_HEADER_SIZE 24U |
26 | #define OSPF_AUTH_SIMPLE_SIZE 8U | |
27 | #define OSPF_AUTH_MD5_SIZE 16U | |
718e3744 | 28 | |
6c835671 | 29 | #define OSPF_MAX_PACKET_SIZE 65535U /* includes IP Header size. */ |
30 | #define OSPF_HELLO_MIN_SIZE 20U /* not including neighbors */ | |
31 | #define OSPF_DB_DESC_MIN_SIZE 8U | |
32 | #define OSPF_LS_REQ_MIN_SIZE 0U | |
33 | #define OSPF_LS_UPD_MIN_SIZE 4U | |
34 | #define OSPF_LS_ACK_MIN_SIZE 0U | |
718e3744 | 35 | |
36 | #define OSPF_MSG_HELLO 1 /* OSPF Hello Message. */ | |
37 | #define OSPF_MSG_DB_DESC 2 /* OSPF Database Descriptoin Message. */ | |
38 | #define OSPF_MSG_LS_REQ 3 /* OSPF Link State Request Message. */ | |
39 | #define OSPF_MSG_LS_UPD 4 /* OSPF Link State Update Message. */ | |
40 | #define OSPF_MSG_LS_ACK 5 /* OSPF Link State Acknoledgement Message. */ | |
41 | ||
42 | #define OSPF_SEND_PACKET_DIRECT 1 | |
43 | #define OSPF_SEND_PACKET_INDIRECT 2 | |
718e3744 | 44 | #define OSPF_SEND_PACKET_LOOP 3 |
718e3744 | 45 | |
46 | #define OSPF_HELLO_REPLY_DELAY 1 | |
47 | ||
75c8eabb DO |
48 | /* Return values of functions involved in packet verification, see ospf6d. */ |
49 | #define MSG_OK 0 | |
50 | #define MSG_NG 1 | |
51 | ||
718e3744 | 52 | struct ospf_packet |
53 | { | |
54 | struct ospf_packet *next; | |
55 | ||
56 | /* Pointer to data stream. */ | |
57 | struct stream *s; | |
58 | ||
59 | /* IP destination address. */ | |
60 | struct in_addr dst; | |
61 | ||
62 | /* OSPF packet length. */ | |
63 | u_int16_t length; | |
64 | }; | |
65 | ||
66 | /* OSPF packet queue structure. */ | |
67 | struct ospf_fifo | |
68 | { | |
69 | unsigned long count; | |
70 | ||
71 | struct ospf_packet *head; | |
72 | struct ospf_packet *tail; | |
73 | }; | |
74 | ||
75 | /* OSPF packet header structure. */ | |
76 | struct ospf_header | |
77 | { | |
78 | u_char version; /* OSPF Version. */ | |
79 | u_char type; /* Packet Type. */ | |
80 | u_int16_t length; /* Packet Length. */ | |
81 | struct in_addr router_id; /* Router ID. */ | |
82 | struct in_addr area_id; /* Area ID. */ | |
83 | u_int16_t checksum; /* Check Sum. */ | |
84 | u_int16_t auth_type; /* Authentication Type. */ | |
85 | /* Authentication Data. */ | |
86 | union | |
87 | { | |
88 | /* Simple Authentication. */ | |
89 | u_char auth_data [OSPF_AUTH_SIMPLE_SIZE]; | |
90 | /* Cryptographic Authentication. */ | |
91 | struct | |
92 | { | |
93 | u_int16_t zero; /* Should be 0. */ | |
94 | u_char key_id; /* Key ID. */ | |
95 | u_char auth_data_len; /* Auth Data Length. */ | |
96 | u_int32_t crypt_seqnum; /* Cryptographic Sequence Number. */ | |
97 | } crypt; | |
98 | } u; | |
99 | }; | |
100 | ||
101 | /* OSPF Hello body format. */ | |
102 | struct ospf_hello | |
103 | { | |
104 | struct in_addr network_mask; | |
105 | u_int16_t hello_interval; | |
106 | u_char options; | |
107 | u_char priority; | |
108 | u_int32_t dead_interval; | |
109 | struct in_addr d_router; | |
110 | struct in_addr bd_router; | |
111 | struct in_addr neighbors[1]; | |
112 | }; | |
113 | ||
114 | /* OSPF Database Description body format. */ | |
115 | struct ospf_db_desc | |
116 | { | |
117 | u_int16_t mtu; | |
118 | u_char options; | |
119 | u_char flags; | |
120 | u_int32_t dd_seqnum; | |
121 | }; | |
122 | ||
4e31de79 DO |
123 | struct ospf_ls_update |
124 | { | |
125 | u_int32_t num_lsas; | |
126 | }; | |
718e3744 | 127 | |
128 | /* Macros. */ | |
86f1fd96 | 129 | /* XXX Perhaps obsolete; function in ospf_packet.c */ |
718e3744 | 130 | #define OSPF_PACKET_MAX(oi) ospf_packet_max (oi) |
718e3744 | 131 | |
132 | #define OSPF_OUTPUT_PNT(S) ((S)->data + (S)->putp) | |
133 | #define OSPF_OUTPUT_LENGTH(S) ((S)->endp) | |
134 | ||
135 | #define IS_SET_DD_MS(X) ((X) & OSPF_DD_FLAG_MS) | |
136 | #define IS_SET_DD_M(X) ((X) & OSPF_DD_FLAG_M) | |
137 | #define IS_SET_DD_I(X) ((X) & OSPF_DD_FLAG_I) | |
138 | #define IS_SET_DD_ALL(X) ((X) & OSPF_DD_FLAG_ALL) | |
139 | ||
140 | /* Prototypes. */ | |
4dadc291 | 141 | extern void ospf_output_forward (struct stream *, int); |
142 | extern struct ospf_packet *ospf_packet_new (size_t); | |
143 | extern void ospf_packet_free (struct ospf_packet *); | |
144 | extern struct ospf_fifo *ospf_fifo_new (void); | |
145 | extern void ospf_fifo_push (struct ospf_fifo *, struct ospf_packet *); | |
146 | extern struct ospf_packet *ospf_fifo_pop (struct ospf_fifo *); | |
147 | extern struct ospf_packet *ospf_fifo_head (struct ospf_fifo *); | |
148 | extern void ospf_fifo_flush (struct ospf_fifo *); | |
149 | extern void ospf_fifo_free (struct ospf_fifo *); | |
150 | extern void ospf_packet_add (struct ospf_interface *, struct ospf_packet *); | |
151 | extern void ospf_packet_delete (struct ospf_interface *); | |
152 | extern struct stream *ospf_stream_dup (struct stream *); | |
153 | extern struct ospf_packet *ospf_packet_dup (struct ospf_packet *); | |
154 | ||
155 | extern int ospf_read (struct thread *); | |
156 | extern void ospf_hello_send (struct ospf_interface *); | |
157 | extern void ospf_db_desc_send (struct ospf_neighbor *); | |
158 | extern void ospf_db_desc_resend (struct ospf_neighbor *); | |
159 | extern void ospf_ls_req_send (struct ospf_neighbor *); | |
160 | extern void ospf_ls_upd_send_lsa (struct ospf_neighbor *, struct ospf_lsa *, | |
161 | int); | |
162 | extern void ospf_ls_upd_send (struct ospf_neighbor *, struct list *, int); | |
163 | extern void ospf_ls_ack_send (struct ospf_neighbor *, struct ospf_lsa *); | |
164 | extern void ospf_ls_ack_send_delayed (struct ospf_interface *); | |
165 | extern void ospf_ls_retransmit (struct ospf_interface *, struct ospf_lsa *); | |
166 | extern void ospf_ls_req_event (struct ospf_neighbor *); | |
167 | ||
168 | extern int ospf_ls_upd_timer (struct thread *); | |
169 | extern int ospf_ls_ack_timer (struct thread *); | |
170 | extern int ospf_poll_timer (struct thread *); | |
171 | extern int ospf_hello_reply_timer (struct thread *); | |
718e3744 | 172 | |
272ca1e3 DO |
173 | extern const struct message ospf_packet_type_str[]; |
174 | extern const size_t ospf_packet_type_str_max; | |
175 | ||
8b6912c2 DS |
176 | extern void ospf_proactively_arp (struct ospf_neighbor *); |
177 | ||
718e3744 | 178 | #endif /* _ZEBRA_OSPF_PACKET_H */ |