ospfd/ospf_api.h

   1 /*
   2  * API message handling module for OSPF daemon and client.
   3  * Copyright (C) 2001, 2002 Ralph Keller
   4  * Copyright (c) 2022, LabN Consulting, L.L.C.
   5  *
   6  * This file is part of GNU Zebra.
   7  *
   8  * GNU Zebra is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published
  10  * by the Free Software Foundation; either version 2, or (at your
  11  * option) any later version.
  12  *
  13  * GNU Zebra is distributed in the hope that it will be useful, but
  14  * WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16  * General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License along
  19  * with this program; see the file COPYING; if not, write to the Free Software
  20  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 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 #include <zebra.h>
  31 #include "ospf_lsa.h"
  32
  33 #define OSPF_API_VERSION           1
  34
  35 /* MTYPE definition is not reflected to "memory.h". */
  36 #define MTYPE_OSPF_API_MSG      MTYPE_TMP
  37 #define MTYPE_OSPF_API_FIFO     MTYPE_TMP
  38
  39 /* Default API server port to accept connection request from client-side. */
  40 /* This value could be overridden by "ospfapi" entry in "/etc/services". */
  41 #define OSPF_API_SYNC_PORT      2607
  42
  43 /* -----------------------------------------------------------
  44  * Generic messages
  45  * -----------------------------------------------------------
  46  */
  47
  48 /* Message header structure, fields are in network byte order and
  49    aligned to four octets. */
  50 struct apimsghdr {
  51         uint8_t version; /* OSPF API protocol version */
  52         uint8_t msgtype; /* Type of message */
  53         uint16_t msglen; /* Length of message w/o header */
  54         uint32_t msgseq; /* Sequence number */
  55 };
  56
  57 /* Message representation with header and body */
  58 struct msg {
  59         struct msg *next; /* to link into fifo */
  60
  61         /* Message header */
  62         struct apimsghdr hdr;
  63
  64         /* Message body */
  65         struct stream *s;
  66 };
  67
  68 /* Prototypes for generic messages. */
  69 extern struct msg *msg_new(uint8_t msgtype, void *msgbody, uint32_t seqnum,
  70                            uint16_t msglen);
  71 extern struct msg *msg_dup(struct msg *msg);
  72 extern void msg_print(struct msg *msg); /* XXX debug only */
  73 extern void msg_free(struct msg *msg);
  74 struct msg *msg_read(int fd);
  75 extern int msg_write(int fd, struct msg *msg);
  76
  77 /* For requests, the message sequence number is between MIN_SEQ and
  78    MAX_SEQ. For notifications, the sequence number is 0. */
  79
  80 #define MIN_SEQ          1
  81 #define MAX_SEQ 2147483647
  82
  83 extern void msg_set_seq(struct msg *msg, uint32_t seqnr);
  84 extern uint32_t msg_get_seq(struct msg *msg);
  85
  86 /* -----------------------------------------------------------
  87  * Message fifo queues
  88  * -----------------------------------------------------------
  89  */
  90
  91 /* Message queue structure. */
  92 struct msg_fifo {
  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 #define MSG_SYNC_REACHABLE        7
 120 #define MSG_SYNC_ISM              8
 121 #define MSG_SYNC_NSM              9
 122 #define MSG_SYNC_ROUTER_ID        19
 123
 124 /* Messages from OSPF daemon. */
 125 #define MSG_REPLY                10
 126 #define MSG_READY_NOTIFY         11
 127 #define MSG_LSA_UPDATE_NOTIFY    12
 128 #define MSG_LSA_DELETE_NOTIFY    13
 129 #define MSG_NEW_IF               14
 130 #define MSG_DEL_IF               15
 131 #define MSG_ISM_CHANGE           16
 132 #define MSG_NSM_CHANGE           17
 133 #define MSG_REACHABLE_CHANGE     18
 134 #define MSG_ROUTER_ID_CHANGE     20
 135
 136 struct msg_register_opaque_type {
 137         uint8_t lsatype;
 138         uint8_t opaquetype;
 139         uint8_t pad[2]; /* padding */
 140 };
 141
 142 struct msg_unregister_opaque_type {
 143         uint8_t lsatype;
 144         uint8_t opaquetype;
 145         uint8_t pad[2]; /* padding */
 146 };
 147
 148 /* Power2 is needed to convert LSA types into bit positions,
 149  * see typemask below. Type definition starts at 1, so
 150  * Power2[0] is not used. */
 151
 152
 153 static const uint16_t Power2[] = {
 154         0,       (1 << 0),  (1 << 1),  (1 << 2),  (1 << 3), (1 << 4),
 155         (1 << 5),  (1 << 6),  (1 << 7),  (1 << 8),  (1 << 9), (1 << 10),
 156         (1 << 11), (1 << 12), (1 << 13), (1 << 14), (1 << 15)};
 157
 158 struct lsa_filter_type {
 159         uint16_t typemask; /* bitmask for selecting LSA types (1..16) */
 160         uint8_t origin;    /* selects according to origin. */
 161 #define NON_SELF_ORIGINATED     0
 162 #define SELF_ORIGINATED  (OSPF_LSA_SELF)
 163 #define ANY_ORIGIN 2
 164
 165         uint8_t num_areas; /* number of areas in the filter. */
 166                            /* areas, if any, go here. */
 167 };
 168
 169 struct msg_register_event {
 170         struct lsa_filter_type filter;
 171 };
 172
 173 struct msg_sync_lsdb {
 174         struct lsa_filter_type filter;
 175 };
 176
 177 struct msg_originate_request {
 178         /* Used for LSA type 9 otherwise ignored */
 179         struct in_addr ifaddr;
 180
 181         /* Used for LSA type 10 otherwise ignored */
 182         struct in_addr area_id;
 183
 184         /* LSA header and LSA-specific part */
 185         struct lsa_header data;
 186 };
 187
 188 struct msg_delete_request {
 189         struct in_addr area_id; /* "0.0.0.0" for AS-external opaque LSAs */
 190         uint8_t lsa_type;
 191         uint8_t opaque_type;
 192         uint8_t pad[2]; /* padding */
 193         uint32_t opaque_id;
 194 };
 195
 196 struct msg_reply {
 197         signed char errcode;
 198 #define OSPF_API_OK                         0
 199 #define OSPF_API_NOSUCHINTERFACE          (-1)
 200 #define OSPF_API_NOSUCHAREA               (-2)
 201 #define OSPF_API_NOSUCHLSA                (-3)
 202 #define OSPF_API_ILLEGALLSATYPE           (-4)
 203 #define OSPF_API_OPAQUETYPEINUSE          (-5)
 204 #define OSPF_API_OPAQUETYPENOTREGISTERED  (-6)
 205 #define OSPF_API_NOTREADY                 (-7)
 206 #define OSPF_API_NOMEMORY                 (-8)
 207 #define OSPF_API_ERROR                    (-9)
 208 #define OSPF_API_UNDEF                   (-10)
 209         uint8_t pad[3]; /* padding to four byte alignment */
 210 };
 211
 212 /* Message to tell client application that it ospf daemon is
 213  * ready to accept opaque LSAs for a given interface or area. */
 214
 215 struct msg_ready_notify {
 216         uint8_t lsa_type;
 217         uint8_t opaque_type;
 218         uint8_t pad[2];      /* padding */
 219         struct in_addr addr; /* interface address or area address */
 220 };
 221
 222 /* These messages have a dynamic length depending on the embodied LSA.
 223    They are aligned to four octets. msg_lsa_change_notify is used for
 224    both LSA update and LSAs delete. */
 225
 226 struct msg_lsa_change_notify {
 227         /* Used for LSA type 9 otherwise ignored */
 228         struct in_addr ifaddr;
 229         /* Area ID. Not valid for AS-External and Opaque11 LSAs. */
 230         struct in_addr area_id;
 231         uint8_t is_self_originated; /* 1 if self originated. */
 232         uint8_t pad[3];
 233         struct lsa_header data;
 234 };
 235
 236 struct msg_new_if {
 237         struct in_addr ifaddr;  /* interface IP address */
 238         struct in_addr area_id; /* area this interface belongs to */
 239 };
 240
 241 struct msg_del_if {
 242         struct in_addr ifaddr; /* interface IP address */
 243 };
 244
 245 struct msg_ism_change {
 246         struct in_addr ifaddr;  /* interface IP address */
 247         struct in_addr area_id; /* area this interface belongs to */
 248         uint8_t status;         /* interface status (up/down) */
 249         uint8_t pad[3];         /* not used */
 250 };
 251
 252 struct msg_nsm_change {
 253         struct in_addr ifaddr;    /* attached interface */
 254         struct in_addr nbraddr;   /* Neighbor interface address */
 255         struct in_addr router_id; /* Router ID of neighbor */
 256         uint8_t status;           /* NSM status */
 257         uint8_t pad[3];
 258 };
 259
 260 struct msg_reachable_change {
 261         uint16_t nadd;
 262         uint16_t nremove;
 263         struct in_addr router_ids[]; /* add followed by remove */
 264 };
 265
 266 struct msg_router_id_change {
 267         struct in_addr router_id; /* this systems router id */
 268 };
 269
 270 /* We make use of a union to define a structure that covers all
 271    possible API messages. This allows us to find out how much memory
 272    needs to be reserved for the largest API message. */
 273 struct apimsg {
 274         struct apimsghdr hdr;
 275         union {
 276                 struct msg_register_opaque_type register_opaque_type;
 277                 struct msg_register_event register_event;
 278                 struct msg_sync_lsdb sync_lsdb;
 279                 struct msg_originate_request originate_request;
 280                 struct msg_delete_request delete_request;
 281                 struct msg_reply reply;
 282                 struct msg_ready_notify ready_notify;
 283                 struct msg_new_if new_if;
 284                 struct msg_del_if del_if;
 285                 struct msg_ism_change ism_change;
 286                 struct msg_nsm_change nsm_change;
 287                 struct msg_lsa_change_notify lsa_change_notify;
 288                 struct msg_reachable_change reachable_change;
 289                 struct msg_router_id_change router_id_change;
 290         } u;
 291 };
 292
 293 #define OSPF_API_MAX_MSG_SIZE (sizeof(struct apimsg) + OSPF_MAX_LSA_SIZE)
 294
 295 /* -----------------------------------------------------------
 296  * Prototypes for specific messages
 297  * -----------------------------------------------------------
 298  */
 299
 300 /* For debugging only. */
 301 extern void api_opaque_lsa_print(struct ospf_lsa *lsa);
 302
 303 /* Messages sent by client */
 304 extern struct msg *new_msg_register_opaque_type(uint32_t seqnum, uint8_t ltype,
 305                                                 uint8_t otype);
 306 extern struct msg *new_msg_register_event(uint32_t seqnum,
 307                                           struct lsa_filter_type *filter);
 308 extern struct msg *new_msg_sync_lsdb(uint32_t seqnum,
 309                                      struct lsa_filter_type *filter);
 310 extern struct msg *new_msg_originate_request(uint32_t seqnum,
 311                                              struct in_addr ifaddr,
 312                                              struct in_addr area_id,
 313                                              struct lsa_header *data);
 314 extern struct msg *new_msg_delete_request(uint32_t seqnum,
 315                                           struct in_addr area_id,
 316                                           uint8_t lsa_type, uint8_t opaque_type,
 317                                           uint32_t opaque_id);
 318
 319 /* Messages sent by OSPF daemon */
 320 extern struct msg *new_msg_reply(uint32_t seqnum, uint8_t rc);
 321
 322 extern struct msg *new_msg_ready_notify(uint32_t seqnr, uint8_t lsa_type,
 323                                         uint8_t opaque_type,
 324                                         struct in_addr addr);
 325
 326 extern struct msg *new_msg_new_if(uint32_t seqnr, struct in_addr ifaddr,
 327                                   struct in_addr area);
 328
 329 extern struct msg *new_msg_del_if(uint32_t seqnr, struct in_addr ifaddr);
 330
 331 extern struct msg *new_msg_ism_change(uint32_t seqnr, struct in_addr ifaddr,
 332                                       struct in_addr area, uint8_t status);
 333
 334 extern struct msg *new_msg_nsm_change(uint32_t seqnr, struct in_addr ifaddr,
 335                                       struct in_addr nbraddr,
 336                                       struct in_addr router_id, uint8_t status);
 337
 338 /* msgtype is MSG_LSA_UPDATE_NOTIFY or MSG_LSA_DELETE_NOTIFY */
 339 extern struct msg *new_msg_lsa_change_notify(uint8_t msgtype, uint32_t seqnum,
 340                                              struct in_addr ifaddr,
 341                                              struct in_addr area_id,
 342                                              uint8_t is_self_originated,
 343                                              struct lsa_header *data);
 344
 345 extern struct msg *new_msg_reachable_change(uint32_t seqnum, uint16_t nadd,
 346                                             struct in_addr *add,
 347                                             uint16_t nremove,
 348                                             struct in_addr *remove);
 349
 350 extern struct msg *new_msg_router_id_change(uint32_t seqnr,
 351                                             struct in_addr router_id);
 352 /* string printing functions */
 353 extern const char *ospf_api_errname(int errcode);
 354 extern const char *ospf_api_typename(int msgtype);
 355
 356 #endif /* _OSPF_API_H */