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:
26: #define OSPF_HEADER_SIZE 24U
27: #define OSPF_AUTH_SIMPLE_SIZE 8U
28: #define OSPF_AUTH_MD5_SIZE 16U
29:
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
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
45: #define OSPF_SEND_PACKET_LOOP 3
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. */
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);
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: #endif /* _ZEBRA_OSPF_PACKET_H */
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