ospfd/ospf_api.h

   1 /*
   2  * API message handling module for OSPF daemon and client.
   3  * Copyright (C) 2001, 2002 Ralph Keller
   4  *
   5  * This file is part of GNU Zebra.
   6  *
   7  * GNU Zebra is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published
   9  * by the Free Software Foundation; either version 2, or (at your
  10  * option) any 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
  19  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  20  * Boston, MA 02111-1307, USA.
  21  */
  22
  23
  24 /* This file is used both by the OSPFd and client applications to
  25    define message formats used for communication. */
  26
  27 #ifndef _OSPF_API_H
  28 #define _OSPF_API_H
  29
  30 #define OSPF_API_VERSION           1
  31
  32 /* MTYPE definition is not reflected to "memory.h". */
  33 #define MTYPE_OSPF_API_MSG      MTYPE_TMP
  34 #define MTYPE_OSPF_API_FIFO     MTYPE_TMP
  35
  36 /* Default API server port to accept connection request from client-side. */
  37 /* This value could be overridden by "ospfapi" entry in "/etc/services". */
  38 #define OSPF_API_SYNC_PORT      2607
  39
  40 /* -----------------------------------------------------------
  41  * Generic messages
  42  * -----------------------------------------------------------
  43  */
  44
  45 /* Message header structure, fields are in network byte order and
  46    aligned to four octets. */
  47 struct apimsghdr
  48 {
  49   u_char version;               /* OSPF API protocol version */
  50   u_char msgtype;               /* Type of message */
  51   u_int16_t msglen;             /* Length of message w/o header */
  52   u_int32_t msgseq;             /* Sequence number */
  53 };
  54
  55 /* Message representation with header and body */
  56 struct msg
  57 {
  58   struct msg *next;             /* to link into fifo */
  59
  60   /* Message header */
  61   struct apimsghdr hdr;
  62
  63   /* Message body */
  64   struct stream *s;
  65 };
  66
  67 /* Prototypes for generic messages. */
  68 extern struct msg *msg_new (u_char msgtype, void *msgbody,
  69                      u_int32_t seqnum, u_int16_t msglen);
  70 extern struct msg *msg_dup (struct msg *msg);
  71 extern void msg_print (struct msg *msg);        /* XXX debug only */
  72 extern void msg_free (struct msg *msg);
  73 struct msg *msg_read (int fd);
  74 extern int msg_write (int fd, struct msg *msg);
  75
  76 /* For requests, the message sequence number is between MIN_SEQ and
  77    MAX_SEQ. For notifications, the sequence number is 0. */
  78
  79 #define MIN_SEQ          1
  80 #define MAX_SEQ 2147483647
  81
  82 extern void msg_set_seq (struct msg *msg, u_int32_t seqnr);
  83 extern u_int32_t msg_get_seq (struct msg *msg);
  84
  85 /* -----------------------------------------------------------
  86  * Message fifo queues
  87  * -----------------------------------------------------------
  88  */
  89
  90 /* Message queue structure. */
  91 struct msg_fifo
  92 {
  93   unsigned long count;
  94
  95   struct msg *head;
  96   struct msg *tail;
  97 };
  98
  99 /* Prototype for message fifo queues. */
 100 extern struct msg_fifo *msg_fifo_new (void);
 101 extern void msg_fifo_push (struct msg_fifo *, struct msg *msg);
 102 extern struct msg *msg_fifo_pop (struct msg_fifo *fifo);
 103 extern struct msg *msg_fifo_head (struct msg_fifo *fifo);
 104 extern void msg_fifo_flush (struct msg_fifo *fifo);
 105 extern void msg_fifo_free (struct msg_fifo *fifo);
 106
 107 /* -----------------------------------------------------------
 108  * Specific message type and format definitions
 109  * -----------------------------------------------------------
 110  */
 111
 112 /* Messages to OSPF daemon. */
 113 #define MSG_REGISTER_OPAQUETYPE   1
 114 #define MSG_UNREGISTER_OPAQUETYPE 2
 115 #define MSG_REGISTER_EVENT        3
 116 #define MSG_SYNC_LSDB             4
 117 #define MSG_ORIGINATE_REQUEST     5
 118 #define MSG_DELETE_REQUEST        6
 119
 120 /* Messages from OSPF daemon. */
 121 #define MSG_REPLY                10
 122 #define MSG_READY_NOTIFY         11
 123 #define MSG_LSA_UPDATE_NOTIFY    12
 124 #define MSG_LSA_DELETE_NOTIFY    13
 125 #define MSG_NEW_IF               14
 126 #define MSG_DEL_IF               15
 127 #define MSG_ISM_CHANGE           16
 128 #define MSG_NSM_CHANGE           17
 129
 130 struct msg_register_opaque_type
 131 {
 132   u_char lsatype;
 133   u_char opaquetype;
 134   u_char pad[2];                /* padding */
 135 };
 136
 137 struct msg_unregister_opaque_type
 138 {
 139   u_char lsatype;
 140   u_char opaquetype;
 141   u_char pad[2];                /* padding */
 142 };
 143
 144 /* Power2 is needed to convert LSA types into bit positions,
 145  * see typemask below. Type definition starts at 1, so
 146  * Power2[0] is not used. */
 147
 148
 149 #ifdef ORIGINAL_CODING
 150 static const u_int16_t
 151   Power2[] = { 0x0, 0x1, 0x2, 0x4, 0x8, 0x10, 0x20, 0x40, 0x80,
 152   0x100, 0x200, 0x400, 0x800, 0x1000, 0x2000, 0x4000, 0x8000
 153 };
 154 #else
 155 static const u_int16_t
 156   Power2[] = { 0, (1 << 0), (1 << 1), (1 << 2), (1 << 3), (1 << 4),
 157   (1 << 5), (1 << 6), (1 << 7), (1 << 8), (1 << 9),
 158   (1 << 10), (1 << 11), (1 << 12), (1 << 13), (1 << 14),
 159   (1 << 15)
 160 };
 161 #endif /* ORIGINAL_CODING */
 162
 163 struct lsa_filter_type
 164 {
 165   u_int16_t typemask;           /* bitmask for selecting LSA types (1..16) */
 166   u_char origin;                /* selects according to origin. */
 167 #define NON_SELF_ORIGINATED     0
 168 #define SELF_ORIGINATED  (OSPF_LSA_SELF)
 169 #define ANY_ORIGIN 2
 170
 171   u_char num_areas;             /* number of areas in the filter. */
 172   /* areas, if any, go here. */
 173 };
 174
 175 struct msg_register_event
 176 {
 177   struct lsa_filter_type filter;
 178 };
 179
 180 struct msg_sync_lsdb
 181 {
 182   struct lsa_filter_type filter;
 183 };
 184
 185 struct msg_originate_request
 186 {
 187   /* Used for LSA type 9 otherwise ignored */
 188   struct in_addr ifaddr;
 189
 190   /* Used for LSA type 10 otherwise ignored */
 191   struct in_addr area_id;
 192
 193   /* LSA header and LSA-specific part */
 194   struct lsa_header data;
 195 };
 196
 197 struct msg_delete_request
 198 {
 199   struct in_addr area_id;       /* "0.0.0.0" for AS-external opaque LSAs */
 200   u_char lsa_type;
 201   u_char opaque_type;
 202   u_char pad[2];                /* padding */
 203   u_int32_t opaque_id;
 204 };
 205
 206 struct msg_reply
 207 {
 208   signed char errcode;
 209 #define OSPF_API_OK                         0
 210 #define OSPF_API_NOSUCHINTERFACE          (-1)
 211 #define OSPF_API_NOSUCHAREA               (-2)
 212 #define OSPF_API_NOSUCHLSA                (-3)
 213 #define OSPF_API_ILLEGALLSATYPE           (-4)
 214 #define OSPF_API_OPAQUETYPEINUSE          (-5)
 215 #define OSPF_API_OPAQUETYPENOTREGISTERED  (-6)
 216 #define OSPF_API_NOTREADY                 (-7)
 217 #define OSPF_API_NOMEMORY                 (-8)
 218 #define OSPF_API_ERROR                    (-9)
 219 #define OSPF_API_UNDEF                   (-10)
 220   u_char pad[3];                /* padding to four byte alignment */
 221 };
 222
 223 /* Message to tell client application that it ospf daemon is
 224  * ready to accept opaque LSAs for a given interface or area. */
 225
 226 struct msg_ready_notify
 227 {
 228   u_char lsa_type;
 229   u_char opaque_type;
 230   u_char pad[2];                /* padding */
 231   struct in_addr addr;          /* interface address or area address */
 232 };
 233
 234 /* These messages have a dynamic length depending on the embodied LSA.
 235    They are aligned to four octets. msg_lsa_change_notify is used for
 236    both LSA update and LSAs delete. */
 237
 238 struct msg_lsa_change_notify
 239 {
 240   /* Used for LSA type 9 otherwise ignored */
 241   struct in_addr ifaddr;
 242   /* Area ID. Not valid for AS-External and Opaque11 LSAs. */
 243   struct in_addr area_id;
 244   u_char is_self_originated;    /* 1 if self originated. */
 245   u_char pad[3];
 246   struct lsa_header data;
 247 };
 248
 249 struct msg_new_if
 250 {
 251   struct in_addr ifaddr;        /* interface IP address */
 252   struct in_addr area_id;       /* area this interface belongs to */
 253 };
 254
 255 struct msg_del_if
 256 {
 257   struct in_addr ifaddr;        /* interface IP address */
 258 };
 259
 260 struct msg_ism_change
 261 {
 262   struct in_addr ifaddr;        /* interface IP address */
 263   struct in_addr area_id;       /* area this interface belongs to */
 264   u_char status;                /* interface status (up/down) */
 265   u_char pad[3];                /* not used */
 266 };
 267
 268 struct msg_nsm_change
 269 {
 270   struct in_addr ifaddr;        /* attached interface */
 271   struct in_addr nbraddr;       /* Neighbor interface address */
 272   struct in_addr router_id;     /* Router ID of neighbor */
 273   u_char status;                /* NSM status */
 274   u_char pad[3];
 275 };
 276
 277 /* We make use of a union to define a structure that covers all
 278    possible API messages. This allows us to find out how much memory
 279    needs to be reserved for the largest API message. */
 280 struct apimsg
 281 {
 282   struct apimsghdr hdr;
 283   union
 284   {
 285     struct msg_register_opaque_type register_opaque_type;
 286     struct msg_register_event register_event;
 287     struct msg_sync_lsdb sync_lsdb;
 288     struct msg_originate_request originate_request;
 289     struct msg_delete_request delete_request;
 290     struct msg_reply reply;
 291     struct msg_ready_notify ready_notify;
 292     struct msg_new_if new_if;
 293     struct msg_del_if del_if;
 294     struct msg_ism_change ism_change;
 295     struct msg_nsm_change nsm_change;
 296     struct msg_lsa_change_notify lsa_change_notify;
 297   }
 298   u;
 299 };
 300
 301 #define OSPF_API_MAX_MSG_SIZE (sizeof(struct apimsg) + OSPF_MAX_LSA_SIZE)
 302
 303 /* -----------------------------------------------------------
 304  * Prototypes for specific messages
 305  * -----------------------------------------------------------
 306  */
 307
 308 /* For debugging only. */
 309 extern void api_opaque_lsa_print (struct lsa_header *data);
 310
 311 /* Messages sent by client */
 312 extern struct msg *new_msg_register_opaque_type (u_int32_t seqnum,
 313                                                  u_char ltype, u_char otype);
 314 extern struct msg *new_msg_register_event (u_int32_t seqnum,
 315                                            struct lsa_filter_type *filter);
 316 extern struct msg *new_msg_sync_lsdb (u_int32_t seqnum,
 317                                       struct lsa_filter_type *filter);
 318 extern struct msg *new_msg_originate_request (u_int32_t seqnum,
 319                                               struct in_addr ifaddr,
 320                                               struct in_addr area_id,
 321                                               struct lsa_header *data);
 322 extern struct msg *new_msg_delete_request (u_int32_t seqnum,
 323                                            struct in_addr area_id,
 324                                            u_char lsa_type,
 325                                            u_char opaque_type,
 326                                            u_int32_t opaque_id);
 327
 328 /* Messages sent by OSPF daemon */
 329 extern struct msg *new_msg_reply (u_int32_t seqnum, u_char rc);
 330
 331 extern struct msg *new_msg_ready_notify (u_int32_t seqnr, u_char lsa_type,
 332                                          u_char opaque_type,
 333                                          struct in_addr addr);
 334
 335 extern struct msg *new_msg_new_if (u_int32_t seqnr,
 336                                    struct in_addr ifaddr,
 337                                    struct in_addr area);
 338
 339 extern struct msg *new_msg_del_if (u_int32_t seqnr, struct in_addr ifaddr);
 340
 341 extern struct msg *new_msg_ism_change (u_int32_t seqnr, struct in_addr ifaddr,
 342                                        struct in_addr area, u_char status);
 343
 344 extern struct msg *new_msg_nsm_change (u_int32_t seqnr, struct in_addr ifaddr,
 345                                        struct in_addr nbraddr,
 346                                        struct in_addr router_id,
 347                                        u_char status);
 348
 349 /* msgtype is MSG_LSA_UPDATE_NOTIFY or MSG_LSA_DELETE_NOTIFY */
 350 extern struct msg *new_msg_lsa_change_notify (u_char msgtype,
 351                                               u_int32_t seqnum,
 352                                               struct in_addr ifaddr,
 353                                               struct in_addr area_id,
 354                                               u_char is_self_originated,
 355                                               struct lsa_header *data);
 356
 357 /* string printing functions */
 358 extern const char *ospf_api_errname (int errcode);
 359 extern const char *ospf_api_typename (int msgtype);
 360
 361 #endif /* _OSPF_API_H */