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Diffstat (limited to 'ospfd/ospf_api.h')
| -rw-r--r-- | ospfd/ospf_api.h | 348 |
1 files changed, 348 insertions, 0 deletions
diff --git a/ospfd/ospf_api.h b/ospfd/ospf_api.h new file mode 100644 index 0000000..6c8bed3 --- /dev/null +++ b/ospfd/ospf_api.h @@ -0,0 +1,348 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * API message handling module for OSPF daemon and client. + * Copyright (C) 2001, 2002 Ralph Keller + * Copyright (c) 2022, LabN Consulting, L.L.C. + */ + + +/* 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 + +#include <zebra.h> +#include "ospf_lsa.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 { + uint8_t version; /* OSPF API protocol version */ + uint8_t msgtype; /* Type of message */ + uint16_t msglen; /* Length of message w/o header */ + uint32_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(uint8_t msgtype, void *msgbody, uint32_t seqnum, + uint16_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, uint32_t seqnr); +extern uint32_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 +#define MSG_SYNC_REACHABLE 7 +#define MSG_SYNC_ISM 8 +#define MSG_SYNC_NSM 9 +#define MSG_SYNC_ROUTER_ID 19 + +/* 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 +#define MSG_REACHABLE_CHANGE 18 +#define MSG_ROUTER_ID_CHANGE 20 + +struct msg_register_opaque_type { + uint8_t lsatype; + uint8_t opaquetype; + uint8_t pad[2]; /* padding */ +}; + +struct msg_unregister_opaque_type { + uint8_t lsatype; + uint8_t opaquetype; + uint8_t 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. */ + + +static const uint16_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)}; + +struct lsa_filter_type { + uint16_t typemask; /* bitmask for selecting LSA types (1..16) */ + uint8_t origin; /* selects according to origin. */ +#define NON_SELF_ORIGINATED 0 +#define SELF_ORIGINATED (OSPF_LSA_SELF) +#define ANY_ORIGIN 2 + + uint8_t 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; +}; + + +/* OSPF API MSG Delete Flag. */ +#define OSPF_API_DEL_ZERO_LEN_LSA 0x01 /* send withdrawal with no LSA data */ + +#define IS_DEL_ZERO_LEN_LSA(x) ((x)->flags & OSPF_API_DEL_ZERO_LEN_LSA) + +struct msg_delete_request { + struct in_addr addr; /* intf IP for link local, area for type 10, + "0.0.0.0" for AS-external */ + uint8_t lsa_type; + uint8_t opaque_type; + uint8_t pad; /* padding */ + uint8_t flags; /* delete flags */ + uint32_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) + uint8_t 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 { + uint8_t lsa_type; + uint8_t opaque_type; + uint8_t 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; + uint8_t is_self_originated; /* 1 if self originated. */ + uint8_t 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 */ + uint8_t status; /* interface status (up/down) */ + uint8_t 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 */ + uint8_t status; /* NSM status */ + uint8_t pad[3]; +}; + +struct msg_reachable_change { + uint16_t nadd; + uint16_t nremove; + struct in_addr router_ids[]; /* add followed by remove */ +}; + +struct msg_router_id_change { + struct in_addr router_id; /* this systems router id */ +}; + +/* 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; + struct msg_reachable_change reachable_change; + struct msg_router_id_change router_id_change; + } u; +}; + +#define OSPF_API_MAX_MSG_SIZE (sizeof(struct apimsg) + OSPF_MAX_PACKET_SIZE) + +/* ----------------------------------------------------------- + * Prototypes for specific messages + * ----------------------------------------------------------- + */ + +/* For debugging only. */ +extern void api_opaque_lsa_print(struct ospf_lsa *lsa); + +/* Messages sent by client */ +extern struct msg *new_msg_register_opaque_type(uint32_t seqnum, uint8_t ltype, + uint8_t otype); +extern struct msg *new_msg_register_event(uint32_t seqnum, + struct lsa_filter_type *filter); +extern struct msg *new_msg_sync_lsdb(uint32_t seqnum, + struct lsa_filter_type *filter); +extern struct msg *new_msg_originate_request(uint32_t seqnum, + struct in_addr ifaddr, + struct in_addr area_id, + struct lsa_header *data); +extern struct msg *new_msg_delete_request(uint32_t seqnum, struct in_addr addr, + uint8_t lsa_type, uint8_t opaque_type, + uint32_t opaque_id, uint8_t flags); + +/* Messages sent by OSPF daemon */ +extern struct msg *new_msg_reply(uint32_t seqnum, uint8_t rc); + +extern struct msg *new_msg_ready_notify(uint32_t seqnr, uint8_t lsa_type, + uint8_t opaque_type, + struct in_addr addr); + +extern struct msg *new_msg_new_if(uint32_t seqnr, struct in_addr ifaddr, + struct in_addr area); + +extern struct msg *new_msg_del_if(uint32_t seqnr, struct in_addr ifaddr); + +extern struct msg *new_msg_ism_change(uint32_t seqnr, struct in_addr ifaddr, + struct in_addr area, uint8_t status); + +extern struct msg *new_msg_nsm_change(uint32_t seqnr, struct in_addr ifaddr, + struct in_addr nbraddr, + struct in_addr router_id, uint8_t status); + +/* msgtype is MSG_LSA_UPDATE_NOTIFY or MSG_LSA_DELETE_NOTIFY */ +extern struct msg *new_msg_lsa_change_notify(uint8_t msgtype, uint32_t seqnum, + struct in_addr ifaddr, + struct in_addr area_id, + uint8_t is_self_originated, + struct lsa_header *data); + +extern struct msg *new_msg_reachable_change(uint32_t seqnum, uint16_t nadd, + struct in_addr *add, + uint16_t nremove, + struct in_addr *remove); + +extern struct msg *new_msg_router_id_change(uint32_t seqnr, + struct in_addr router_id); +/* string printing functions */ +extern const char *ospf_api_errname(int errcode); +extern const char *ospf_api_typename(int msgtype); + +#endif /* _OSPF_API_H */ |