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 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
  23 /* This file is used both by the OSPFd and client applications to
  24    define message formats used for communication. */
  25
  26 #ifndef _OSPF_API_H
  27 #define _OSPF_API_H
  28
  29 #define OSPF_API_VERSION           1
  30
  31 /* MTYPE definition is not reflected to "memory.h". */
  32 #define MTYPE_OSPF_API_MSG      MTYPE_TMP
  33 #define MTYPE_OSPF_API_FIFO     MTYPE_TMP
  34
  35 /* Default API server port to accept connection request from client-side. */
  36 /* This value could be overridden by "ospfapi" entry in "/etc/services". */
  37 #define OSPF_API_SYNC_PORT      2607
  38
  39 /* -----------------------------------------------------------
  40  * Generic messages
  41  * -----------------------------------------------------------
  42  */
  43
  44 /* Message header structure, fields are in network byte order and
  45    aligned to four octets. */
  46 struct apimsghdr {
  47         uint8_t version; /* OSPF API protocol version */
  48         uint8_t msgtype; /* Type of message */
  49         uint16_t msglen; /* Length of message w/o header */
  50         uint32_t msgseq; /* Sequence number */
  51 };
  52
  53 /* Message representation with header and body */
  54 struct msg {
  55         struct msg *next; /* to link into fifo */
  56
  57         /* Message header */
  58         struct apimsghdr hdr;
  59
  60         /* Message body */
  61         struct stream *s;
  62 };
  63
  64 /* Prototypes for generic messages. */
  65 extern struct msg *msg_new(uint8_t msgtype, void *msgbody, uint32_t seqnum,
  66                            uint16_t msglen);
  67 extern struct msg *msg_dup(struct msg *msg);
  68 extern void msg_print(struct msg *msg); /* XXX debug only */
  69 extern void msg_free(struct msg *msg);
  70 struct msg *msg_read(int fd);
  71 extern int msg_write(int fd, struct msg *msg);
  72
  73 /* For requests, the message sequence number is between MIN_SEQ and
  74    MAX_SEQ. For notifications, the sequence number is 0. */
  75
  76 #define MIN_SEQ          1
  77 #define MAX_SEQ 2147483647
  78
  79 extern void msg_set_seq(struct msg *msg, uint32_t seqnr);
  80 extern uint32_t msg_get_seq(struct msg *msg);
  81
  82 /* -----------------------------------------------------------
  83  * Message fifo queues
  84  * -----------------------------------------------------------
  85  */
  86
  87 /* Message queue structure. */
  88 struct msg_fifo {
  89         unsigned long count;
  90
  91         struct msg *head;
  92         struct msg *tail;
  93 };
  94
  95 /* Prototype for message fifo queues. */
  96 extern struct msg_fifo *msg_fifo_new(void);
  97 extern void msg_fifo_push(struct msg_fifo *, struct msg *msg);
  98 extern struct msg *msg_fifo_pop(struct msg_fifo *fifo);
  99 extern struct msg *msg_fifo_head(struct msg_fifo *fifo);
 100 extern void msg_fifo_flush(struct msg_fifo *fifo);
 101 extern void msg_fifo_free(struct msg_fifo *fifo);
 102
 103 /* -----------------------------------------------------------
 104  * Specific message type and format definitions
 105  * -----------------------------------------------------------
 106  */
 107
 108 /* Messages to OSPF daemon. */
 109 #define MSG_REGISTER_OPAQUETYPE   1
 110 #define MSG_UNREGISTER_OPAQUETYPE 2
 111 #define MSG_REGISTER_EVENT        3
 112 #define MSG_SYNC_LSDB             4
 113 #define MSG_ORIGINATE_REQUEST     5
 114 #define MSG_DELETE_REQUEST        6
 115
 116 /* Messages from OSPF daemon. */
 117 #define MSG_REPLY                10
 118 #define MSG_READY_NOTIFY         11
 119 #define MSG_LSA_UPDATE_NOTIFY    12
 120 #define MSG_LSA_DELETE_NOTIFY    13
 121 #define MSG_NEW_IF               14
 122 #define MSG_DEL_IF               15
 123 #define MSG_ISM_CHANGE           16
 124 #define MSG_NSM_CHANGE           17
 125
 126 struct msg_register_opaque_type {
 127         uint8_t lsatype;
 128         uint8_t opaquetype;
 129         uint8_t pad[2]; /* padding */
 130 };
 131
 132 struct msg_unregister_opaque_type {
 133         uint8_t lsatype;
 134         uint8_t opaquetype;
 135         uint8_t pad[2]; /* padding */
 136 };
 137
 138 /* Power2 is needed to convert LSA types into bit positions,
 139  * see typemask below. Type definition starts at 1, so
 140  * Power2[0] is not used. */
 141
 142
 143 static const uint16_t Power2[] = {
 144         0,       (1 << 0),  (1 << 1),  (1 << 2),  (1 << 3), (1 << 4),
 145         (1 << 5),  (1 << 6),  (1 << 7),  (1 << 8),  (1 << 9), (1 << 10),
 146         (1 << 11), (1 << 12), (1 << 13), (1 << 14), (1 << 15)};
 147
 148 struct lsa_filter_type {
 149         uint16_t typemask; /* bitmask for selecting LSA types (1..16) */
 150         uint8_t origin;    /* selects according to origin. */
 151 #define NON_SELF_ORIGINATED     0
 152 #define SELF_ORIGINATED  (OSPF_LSA_SELF)
 153 #define ANY_ORIGIN 2
 154
 155         uint8_t num_areas; /* number of areas in the filter. */
 156                            /* areas, if any, go here. */
 157 };
 158
 159 struct msg_register_event {
 160         struct lsa_filter_type filter;
 161 };
 162
 163 struct msg_sync_lsdb {
 164         struct lsa_filter_type filter;
 165 };
 166
 167 struct msg_originate_request {
 168         /* Used for LSA type 9 otherwise ignored */
 169         struct in_addr ifaddr;
 170
 171         /* Used for LSA type 10 otherwise ignored */
 172         struct in_addr area_id;
 173
 174         /* LSA header and LSA-specific part */
 175         struct lsa_header data;
 176 };
 177
 178 struct msg_delete_request {
 179         struct in_addr area_id; /* "0.0.0.0" for AS-external opaque LSAs */
 180         uint8_t lsa_type;
 181         uint8_t opaque_type;
 182         uint8_t pad[2]; /* padding */
 183         uint32_t opaque_id;
 184 };
 185
 186 struct msg_reply {
 187         signed char errcode;
 188 #define OSPF_API_OK                         0
 189 #define OSPF_API_NOSUCHINTERFACE          (-1)
 190 #define OSPF_API_NOSUCHAREA               (-2)
 191 #define OSPF_API_NOSUCHLSA                (-3)
 192 #define OSPF_API_ILLEGALLSATYPE           (-4)
 193 #define OSPF_API_OPAQUETYPEINUSE          (-5)
 194 #define OSPF_API_OPAQUETYPENOTREGISTERED  (-6)
 195 #define OSPF_API_NOTREADY                 (-7)
 196 #define OSPF_API_NOMEMORY                 (-8)
 197 #define OSPF_API_ERROR                    (-9)
 198 #define OSPF_API_UNDEF                   (-10)
 199         uint8_t pad[3]; /* padding to four byte alignment */
 200 };
 201
 202 /* Message to tell client application that it ospf daemon is
 203  * ready to accept opaque LSAs for a given interface or area. */
 204
 205 struct msg_ready_notify {
 206         uint8_t lsa_type;
 207         uint8_t opaque_type;
 208         uint8_t pad[2];      /* padding */
 209         struct in_addr addr; /* interface address or area address */
 210 };
 211
 212 /* These messages have a dynamic length depending on the embodied LSA.
 213    They are aligned to four octets. msg_lsa_change_notify is used for
 214    both LSA update and LSAs delete. */
 215
 216 struct msg_lsa_change_notify {
 217         /* Used for LSA type 9 otherwise ignored */
 218         struct in_addr ifaddr;
 219         /* Area ID. Not valid for AS-External and Opaque11 LSAs. */
 220         struct in_addr area_id;
 221         uint8_t is_self_originated; /* 1 if self originated. */
 222         uint8_t pad[3];
 223         struct lsa_header data;
 224 };
 225
 226 struct msg_new_if {
 227         struct in_addr ifaddr;  /* interface IP address */
 228         struct in_addr area_id; /* area this interface belongs to */
 229 };
 230
 231 struct msg_del_if {
 232         struct in_addr ifaddr; /* interface IP address */
 233 };
 234
 235 struct msg_ism_change {
 236         struct in_addr ifaddr;  /* interface IP address */
 237         struct in_addr area_id; /* area this interface belongs to */
 238         uint8_t status;         /* interface status (up/down) */
 239         uint8_t pad[3];         /* not used */
 240 };
 241
 242 struct msg_nsm_change {
 243         struct in_addr ifaddr;    /* attached interface */
 244         struct in_addr nbraddr;   /* Neighbor interface address */
 245         struct in_addr router_id; /* Router ID of neighbor */
 246         uint8_t status;           /* NSM status */
 247         uint8_t pad[3];
 248 };
 249
 250 /* We make use of a union to define a structure that covers all
 251    possible API messages. This allows us to find out how much memory
 252    needs to be reserved for the largest API message. */
 253 struct apimsg {
 254         struct apimsghdr hdr;
 255         union {
 256                 struct msg_register_opaque_type register_opaque_type;
 257                 struct msg_register_event register_event;
 258                 struct msg_sync_lsdb sync_lsdb;
 259                 struct msg_originate_request originate_request;
 260                 struct msg_delete_request delete_request;
 261                 struct msg_reply reply;
 262                 struct msg_ready_notify ready_notify;
 263                 struct msg_new_if new_if;
 264                 struct msg_del_if del_if;
 265                 struct msg_ism_change ism_change;
 266                 struct msg_nsm_change nsm_change;
 267                 struct msg_lsa_change_notify lsa_change_notify;
 268         } u;
 269 };
 270
 271 #define OSPF_API_MAX_MSG_SIZE (sizeof(struct apimsg) + OSPF_MAX_LSA_SIZE)
 272
 273 /* -----------------------------------------------------------
 274  * Prototypes for specific messages
 275  * -----------------------------------------------------------
 276  */
 277
 278 /* For debugging only. */
 279 extern void api_opaque_lsa_print(struct lsa_header *data);
 280
 281 /* Messages sent by client */
 282 extern struct msg *new_msg_register_opaque_type(uint32_t seqnum, uint8_t ltype,
 283                                                 uint8_t otype);
 284 extern struct msg *new_msg_register_event(uint32_t seqnum,
 285                                           struct lsa_filter_type *filter);
 286 extern struct msg *new_msg_sync_lsdb(uint32_t seqnum,
 287                                      struct lsa_filter_type *filter);
 288 extern struct msg *new_msg_originate_request(uint32_t seqnum,
 289                                              struct in_addr ifaddr,
 290                                              struct in_addr area_id,
 291                                              struct lsa_header *data);
 292 extern struct msg *new_msg_delete_request(uint32_t seqnum,
 293                                           struct in_addr area_id,
 294                                           uint8_t lsa_type, uint8_t opaque_type,
 295                                           uint32_t opaque_id);
 296
 297 /* Messages sent by OSPF daemon */
 298 extern struct msg *new_msg_reply(uint32_t seqnum, uint8_t rc);
 299
 300 extern struct msg *new_msg_ready_notify(uint32_t seqnr, uint8_t lsa_type,
 301                                         uint8_t opaque_type,
 302                                         struct in_addr addr);
 303
 304 extern struct msg *new_msg_new_if(uint32_t seqnr, struct in_addr ifaddr,
 305                                   struct in_addr area);
 306
 307 extern struct msg *new_msg_del_if(uint32_t seqnr, struct in_addr ifaddr);
 308
 309 extern struct msg *new_msg_ism_change(uint32_t seqnr, struct in_addr ifaddr,
 310                                       struct in_addr area, uint8_t status);
 311
 312 extern struct msg *new_msg_nsm_change(uint32_t seqnr, struct in_addr ifaddr,
 313                                       struct in_addr nbraddr,
 314                                       struct in_addr router_id, uint8_t status);
 315
 316 /* msgtype is MSG_LSA_UPDATE_NOTIFY or MSG_LSA_DELETE_NOTIFY */
 317 extern struct msg *new_msg_lsa_change_notify(uint8_t msgtype, uint32_t seqnum,
 318                                              struct in_addr ifaddr,
 319                                              struct in_addr area_id,
 320                                              uint8_t is_self_originated,
 321                                              struct lsa_header *data);
 322
 323 /* string printing functions */
 324 extern const char *ospf_api_errname(int errcode);
 325 extern const char *ospf_api_typename(int msgtype);
 326
 327 #endif /* _OSPF_API_H */