ospfd/ospf_packet.h

   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 extern void ospf_hello_send_sub (struct ospf_interface *, struct in_addr *);
 166
 167 #endif /* _ZEBRA_OSPF_PACKET_H */