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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 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 | |
20 | */ | |
21 | ||
22 | #ifndef _ZEBRA_OSPF_PACKET_H | |
23 | #define _ZEBRA_OSPF_PACKET_H | |
24 | ||
25 | #define OSPF_HEADER_SIZE 24U | |
26 | #define OSPF_AUTH_SIMPLE_SIZE 8U | |
27 | #define OSPF_AUTH_MD5_SIZE 16U | |
28 | ||
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 | |
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 | |
44 | #define OSPF_SEND_PACKET_LOOP 3 | |
45 | ||
46 | #define OSPF_HELLO_REPLY_DELAY 1 | |
47 | ||
48 | /* Return values of functions involved in packet verification, see ospf6d. */ | |
49 | #define MSG_OK 0 | |
50 | #define MSG_NG 1 | |
51 | ||
52 | struct ospf_packet { | |
53 | struct ospf_packet *next; | |
54 | ||
55 | /* Pointer to data stream. */ | |
56 | struct stream *s; | |
57 | ||
58 | /* IP destination address. */ | |
59 | struct in_addr dst; | |
60 | ||
61 | /* OSPF packet length. */ | |
62 | uint16_t length; | |
63 | }; | |
64 | ||
65 | /* OSPF packet queue structure. */ | |
66 | struct ospf_fifo { | |
67 | unsigned long count; | |
68 | ||
69 | struct ospf_packet *head; | |
70 | struct ospf_packet *tail; | |
71 | }; | |
72 | ||
73 | /* OSPF packet header structure. */ | |
74 | struct ospf_header { | |
75 | uint8_t version; /* OSPF Version. */ | |
76 | uint8_t type; /* Packet Type. */ | |
77 | uint16_t length; /* Packet Length. */ | |
78 | struct in_addr router_id; /* Router ID. */ | |
79 | struct in_addr area_id; /* Area ID. */ | |
80 | uint16_t checksum; /* Check Sum. */ | |
81 | uint16_t auth_type; /* Authentication Type. */ | |
82 | /* Authentication Data. */ | |
83 | union { | |
84 | /* Simple Authentication. */ | |
85 | uint8_t auth_data[OSPF_AUTH_SIMPLE_SIZE]; | |
86 | /* Cryptographic Authentication. */ | |
87 | struct { | |
88 | uint16_t zero; /* Should be 0. */ | |
89 | uint8_t key_id; /* Key ID. */ | |
90 | uint8_t auth_data_len; /* Auth Data Length. */ | |
91 | uint32_t crypt_seqnum; /* Cryptographic Sequence | |
92 | Number. */ | |
93 | } crypt; | |
94 | } u; | |
95 | }; | |
96 | ||
97 | /* OSPF Hello body format. */ | |
98 | struct ospf_hello { | |
99 | struct in_addr network_mask; | |
100 | uint16_t hello_interval; | |
101 | uint8_t options; | |
102 | uint8_t priority; | |
103 | uint32_t dead_interval; | |
104 | struct in_addr d_router; | |
105 | struct in_addr bd_router; | |
106 | struct in_addr neighbors[1]; | |
107 | }; | |
108 | ||
109 | /* OSPF Database Description body format. */ | |
110 | struct ospf_db_desc { | |
111 | uint16_t mtu; | |
112 | uint8_t options; | |
113 | uint8_t flags; | |
114 | uint32_t dd_seqnum; | |
115 | }; | |
116 | ||
117 | struct ospf_ls_update { | |
118 | uint32_t num_lsas; | |
119 | }; | |
120 | ||
121 | /* Macros. */ | |
122 | /* XXX Perhaps obsolete; function in ospf_packet.c */ | |
123 | #define OSPF_PACKET_MAX(oi) ospf_packet_max (oi) | |
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. */ | |
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, 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 | ||
166 | extern const struct message ospf_packet_type_str[]; | |
167 | extern const size_t ospf_packet_type_str_max; | |
168 | ||
169 | extern void ospf_proactively_arp(struct ospf_neighbor *); | |
170 | ||
171 | #endif /* _ZEBRA_OSPF_PACKET_H */ |