/* * API message handling module for OSPF daemon and client. * Copyright (C) 2001, 2002 Ralph Keller * * This file is part of GNU Zebra. * * GNU Zebra is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published * by the Free Software Foundation; either version 2, or (at your * option) any later version. * * GNU Zebra is distributed in the hope that it will be useful, but * WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * General Public License for more details. * * You should have received a copy of the GNU General Public License * along with GNU Zebra; see the file COPYING. If not, write to the * Free Software Foundation, Inc., 59 Temple Place - Suite 330, * Boston, MA 02111-1307, USA. */ /* This file is used both by the OSPFd and client applications to define message formats used for communication. */ #ifndef _OSPF_API_H #define _OSPF_API_H #define OSPF_API_VERSION 1 /* MTYPE definition is not reflected to "memory.h". */ #define MTYPE_OSPF_API_MSG MTYPE_TMP #define MTYPE_OSPF_API_FIFO MTYPE_TMP /* Default API server port to accept connection request from client-side. */ /* This value could be overridden by "ospfapi" entry in "/etc/services". */ #define OSPF_API_SYNC_PORT 2607 /* ----------------------------------------------------------- * Generic messages * ----------------------------------------------------------- */ /* Message header structure, fields are in network byte order and aligned to four octets. */ struct apimsghdr { u_char version; /* OSPF API protocol version */ u_char msgtype; /* Type of message */ u_int16_t msglen; /* Length of message w/o header */ u_int32_t msgseq; /* Sequence number */ }; /* Message representation with header and body */ struct msg { struct msg *next; /* to link into fifo */ /* Message header */ struct apimsghdr hdr; /* Message body */ struct stream *s; }; /* Prototypes for generic messages. */ extern struct msg *msg_new (u_char msgtype, void *msgbody, u_int32_t seqnum, u_int16_t msglen); extern struct msg *msg_dup (struct msg *msg); extern void msg_print (struct msg *msg); /* XXX debug only */ extern void msg_free (struct msg *msg); struct msg *msg_read (int fd); extern int msg_write (int fd, struct msg *msg); /* For requests, the message sequence number is between MIN_SEQ and MAX_SEQ. For notifications, the sequence number is 0. */ #define MIN_SEQ 1 #define MAX_SEQ 2147483647 extern void msg_set_seq (struct msg *msg, u_int32_t seqnr); extern u_int32_t msg_get_seq (struct msg *msg); /* ----------------------------------------------------------- * Message fifo queues * ----------------------------------------------------------- */ /* Message queue structure. */ struct msg_fifo { unsigned long count; struct msg *head; struct msg *tail; }; /* Prototype for message fifo queues. */ extern struct msg_fifo *msg_fifo_new (void); extern void msg_fifo_push (struct msg_fifo *, struct msg *msg); extern struct msg *msg_fifo_pop (struct msg_fifo *fifo); extern struct msg *msg_fifo_head (struct msg_fifo *fifo); extern void msg_fifo_flush (struct msg_fifo *fifo); extern void msg_fifo_free (struct msg_fifo *fifo); /* ----------------------------------------------------------- * Specific message type and format definitions * ----------------------------------------------------------- */ /* Messages to OSPF daemon. */ #define MSG_REGISTER_OPAQUETYPE 1 #define MSG_UNREGISTER_OPAQUETYPE 2 #define MSG_REGISTER_EVENT 3 #define MSG_SYNC_LSDB 4 #define MSG_ORIGINATE_REQUEST 5 #define MSG_DELETE_REQUEST 6 /* Messages from OSPF daemon. */ #define MSG_REPLY 10 #define MSG_READY_NOTIFY 11 #define MSG_LSA_UPDATE_NOTIFY 12 #define MSG_LSA_DELETE_NOTIFY 13 #define MSG_NEW_IF 14 #define MSG_DEL_IF 15 #define MSG_ISM_CHANGE 16 #define MSG_NSM_CHANGE 17 struct msg_register_opaque_type { u_char lsatype; u_char opaquetype; u_char pad[2]; /* padding */ }; struct msg_unregister_opaque_type { u_char lsatype; u_char opaquetype; u_char pad[2]; /* padding */ }; /* Power2 is needed to convert LSA types into bit positions, * see typemask below. Type definition starts at 1, so * Power2[0] is not used. */ #ifdef ORIGINAL_CODING static const u_int16_t Power2[] = { 0x0, 0x1, 0x2, 0x4, 0x8, 0x10, 0x20, 0x40, 0x80, 0x100, 0x200, 0x400, 0x800, 0x1000, 0x2000, 0x4000, 0x8000 }; #else static const u_int16_t Power2[] = { 0, (1 << 0), (1 << 1), (1 << 2), (1 << 3), (1 << 4), (1 << 5), (1 << 6), (1 << 7), (1 << 8), (1 << 9), (1 << 10), (1 << 11), (1 << 12), (1 << 13), (1 << 14), (1 << 15) }; #endif /* ORIGINAL_CODING */ struct lsa_filter_type { u_int16_t typemask; /* bitmask for selecting LSA types (1..16) */ u_char origin; /* selects according to origin. */ #define NON_SELF_ORIGINATED 0 #define SELF_ORIGINATED (OSPF_LSA_SELF) #define ANY_ORIGIN 2 u_char num_areas; /* number of areas in the filter. */ /* areas, if any, go here. */ }; struct msg_register_event { struct lsa_filter_type filter; }; struct msg_sync_lsdb { struct lsa_filter_type filter; }; struct msg_originate_request { /* Used for LSA type 9 otherwise ignored */ struct in_addr ifaddr; /* Used for LSA type 10 otherwise ignored */ struct in_addr area_id; /* LSA header and LSA-specific part */ struct lsa_header data; }; struct msg_delete_request { struct in_addr area_id; /* "0.0.0.0" for AS-external opaque LSAs */ u_char lsa_type; u_char opaque_type; u_char pad[2]; /* padding */ u_int32_t opaque_id; }; struct msg_reply { signed char errcode; #define OSPF_API_OK 0 #define OSPF_API_NOSUCHINTERFACE (-1) #define OSPF_API_NOSUCHAREA (-2) #define OSPF_API_NOSUCHLSA (-3) #define OSPF_API_ILLEGALLSATYPE (-4) #define OSPF_API_OPAQUETYPEINUSE (-5) #define OSPF_API_OPAQUETYPENOTREGISTERED (-6) #define OSPF_API_NOTREADY (-7) #define OSPF_API_NOMEMORY (-8) #define OSPF_API_ERROR (-9) #define OSPF_API_UNDEF (-10) u_char pad[3]; /* padding to four byte alignment */ }; /* Message to tell client application that it ospf daemon is * ready to accept opaque LSAs for a given interface or area. */ struct msg_ready_notify { u_char lsa_type; u_char opaque_type; u_char pad[2]; /* padding */ struct in_addr addr; /* interface address or area address */ }; /* These messages have a dynamic length depending on the embodied LSA. They are aligned to four octets. msg_lsa_change_notify is used for both LSA update and LSAs delete. */ struct msg_lsa_change_notify { /* Used for LSA type 9 otherwise ignored */ struct in_addr ifaddr; /* Area ID. Not valid for AS-External and Opaque11 LSAs. */ struct in_addr area_id; u_char is_self_originated; /* 1 if self originated. */ u_char pad[3]; struct lsa_header data; }; struct msg_new_if { struct in_addr ifaddr; /* interface IP address */ struct in_addr area_id; /* area this interface belongs to */ }; struct msg_del_if { struct in_addr ifaddr; /* interface IP address */ }; struct msg_ism_change { struct in_addr ifaddr; /* interface IP address */ struct in_addr area_id; /* area this interface belongs to */ u_char status; /* interface status (up/down) */ u_char pad[3]; /* not used */ }; struct msg_nsm_change { struct in_addr ifaddr; /* attached interface */ struct in_addr nbraddr; /* Neighbor interface address */ struct in_addr router_id; /* Router ID of neighbor */ u_char status; /* NSM status */ u_char pad[3]; }; /* We make use of a union to define a structure that covers all possible API messages. This allows us to find out how much memory needs to be reserved for the largest API message. */ struct apimsg { struct apimsghdr hdr; union { struct msg_register_opaque_type register_opaque_type; struct msg_register_event register_event; struct msg_sync_lsdb sync_lsdb; struct msg_originate_request originate_request; struct msg_delete_request delete_request; struct msg_reply reply; struct msg_ready_notify ready_notify; struct msg_new_if new_if; struct msg_del_if del_if; struct msg_ism_change ism_change; struct msg_nsm_change nsm_change; struct msg_lsa_change_notify lsa_change_notify; } u; }; #define OSPF_API_MAX_MSG_SIZE (sizeof(struct apimsg) + OSPF_MAX_LSA_SIZE) /* ----------------------------------------------------------- * Prototypes for specific messages * ----------------------------------------------------------- */ /* For debugging only. */ extern void api_opaque_lsa_print (struct lsa_header *data); /* Messages sent by client */ extern struct msg *new_msg_register_opaque_type (u_int32_t seqnum, u_char ltype, u_char otype); extern struct msg *new_msg_register_event (u_int32_t seqnum, struct lsa_filter_type *filter); extern struct msg *new_msg_sync_lsdb (u_int32_t seqnum, struct lsa_filter_type *filter); extern struct msg *new_msg_originate_request (u_int32_t seqnum, struct in_addr ifaddr, struct in_addr area_id, struct lsa_header *data); extern struct msg *new_msg_delete_request (u_int32_t seqnum, struct in_addr area_id, u_char lsa_type, u_char opaque_type, u_int32_t opaque_id); /* Messages sent by OSPF daemon */ extern struct msg *new_msg_reply (u_int32_t seqnum, u_char rc); extern struct msg *new_msg_ready_notify (u_int32_t seqnr, u_char lsa_type, u_char opaque_type, struct in_addr addr); extern struct msg *new_msg_new_if (u_int32_t seqnr, struct in_addr ifaddr, struct in_addr area); extern struct msg *new_msg_del_if (u_int32_t seqnr, struct in_addr ifaddr); extern struct msg *new_msg_ism_change (u_int32_t seqnr, struct in_addr ifaddr, struct in_addr area, u_char status); extern struct msg *new_msg_nsm_change (u_int32_t seqnr, struct in_addr ifaddr, struct in_addr nbraddr, struct in_addr router_id, u_char status); /* msgtype is MSG_LSA_UPDATE_NOTIFY or MSG_LSA_DELETE_NOTIFY */ extern struct msg *new_msg_lsa_change_notify (u_char msgtype, u_int32_t seqnum, struct in_addr ifaddr, struct in_addr area_id, u_char is_self_originated, struct lsa_header *data); /* string printing functions */ extern const char *ospf_api_errname (int errcode); extern const char *ospf_api_typename (int msgtype); #endif /* _OSPF_API_H */