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 24 27#define OSPF_AUTH_SIMPLE_SIZE 8 28#define OSPF_AUTH_MD5_SIZE 16 29 30#define OSPF_MAX_PACKET_SIZE 65535 /* includes IP Header size. */ 31#define OSPF_HELLO_MIN_SIZE 20 /* not including neighbors */ 32#define OSPF_DB_DESC_MIN_SIZE 8 33#define OSPF_LS_REQ_MIN_SIZE 0 34#define OSPF_LS_UPD_MIN_SIZE 4 35#define OSPF_LS_ACK_MIN_SIZE 0 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 46#ifdef HAVE_NSSA 47#define OSPF_SEND_PACKET_LOOP 3 48#endif /* HAVE_NSSA */ 49 50#define OSPF_HELLO_REPLY_DELAY 1 51 52struct 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. */ 67struct 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. */ 76struct 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. */ 102struct 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. */ 115struct ospf_db_desc 116{ 117 u_int16_t mtu; 118 u_char options; 119 u_char flags; 120 u_int32_t dd_seqnum; 121}; 122 123 124/* Macros. */ 125#define OSPF_PACKET_MAX(oi) ospf_packet_max (oi) 126/* 127#define OSPF_PACKET_MAX(oi) (((oi)->ifp->mtu - ((oi)->auth_md5 ? OSPF_AUTH_MD5_SIZE : 0)) - 88) 128*/ 129 130#define OSPF_OUTPUT_PNT(S) ((S)->data + (S)->putp) 131#define OSPF_OUTPUT_LENGTH(S) ((S)->endp) 132 133#define IS_SET_DD_MS(X) ((X) & OSPF_DD_FLAG_MS) 134#define IS_SET_DD_M(X) ((X) & OSPF_DD_FLAG_M) 135#define IS_SET_DD_I(X) ((X) & OSPF_DD_FLAG_I) 136#define IS_SET_DD_ALL(X) ((X) & OSPF_DD_FLAG_ALL) 137 138/* Prototypes. */ 139void ospf_output_forward (struct stream *, int); 140struct ospf_packet *ospf_packet_new (size_t); 141void ospf_packet_free (struct ospf_packet *); 142struct ospf_fifo *ospf_fifo_new (); 143void ospf_fifo_push (struct ospf_fifo *, struct ospf_packet *); 144struct ospf_packet *ospf_fifo_pop (struct ospf_fifo *); 145struct ospf_packet *ospf_fifo_head (struct ospf_fifo *); 146void ospf_fifo_flush (struct ospf_fifo *); 147void ospf_fifo_free (struct ospf_fifo *); 148void ospf_packet_add (struct ospf_interface *, struct ospf_packet *); 149void ospf_packet_delete (struct ospf_interface *); 150struct stream *ospf_stream_dup (struct stream *); 151struct ospf_packet *ospf_packet_dup (struct ospf_packet *); 152 153int ospf_read (struct thread *); 154void ospf_hello_send (struct ospf_interface *); 155void ospf_db_desc_send (struct ospf_neighbor *); 156void ospf_db_desc_resend (struct ospf_neighbor *); 157void ospf_ls_req_send (struct ospf_neighbor *); 158void ospf_ls_upd_send_lsa (struct ospf_neighbor *, struct ospf_lsa *, int); 159void ospf_ls_upd_send (struct ospf_neighbor *, list, int); 160void ospf_ls_ack_send (struct ospf_neighbor *, struct ospf_lsa *); 161void ospf_ls_ack_send_delayed (struct ospf_interface *); 162void ospf_ls_retransmit (struct ospf_interface *, struct ospf_lsa *); 163void ospf_ls_req_event (struct ospf_neighbor *); 164 165int ospf_ls_upd_timer (struct thread *); 166int ospf_ls_ack_timer (struct thread *); 167int ospf_poll_timer (struct thread *); 168int ospf_hello_reply_timer (struct thread *); 169void ospf_hello_send_sub (struct ospf_interface *, struct in_addr *); 170 171#endif /* _ZEBRA_OSPF_PACKET_H */ 172