contrib/dhcp-3.0/includes/failover.h

   1 /* failover.h
   2
   3    Definitions for address trees... */
   4
   5 /*
   6  * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
   7  * Copyright (c) 2000-2003 by Internet Software Consortium
   8  *
   9  * Permission to use, copy, modify, and distribute this software for any
  10  * purpose with or without fee is hereby granted, provided that the above
  11  * copyright notice and this permission notice appear in all copies.
  12  *
  13  * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES
  14  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  15  * MERCHANTABILITY AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR
  16  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  17  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  18  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
  19  * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  20  *
  21  *   Internet Systems Consortium, Inc.
  22  *   950 Charter Street
  23  *   Redwood City, CA 94063
  24  *   <info@isc.org>
  25  *   http://www.isc.org/
  26  *
  27  * This software has been written for Internet Systems Consortium
  28  * by Ted Lemon in cooperation with Vixie Enterprises and Nominum, Inc.
  29  * To learn more about Internet Systems Consortium, see
  30  * ``http://www.isc.org/''.  To learn more about Vixie Enterprises,
  31  * see ``http://www.vix.com''.   To learn more about Nominum, Inc., see
  32  * ``http://www.nominum.com''.
  33  */
  34
  35 #if defined (FAILOVER_PROTOCOL)
  36 struct failover_option_info {
  37         int code;
  38         const char *name;
  39         enum { FT_UINT8, FT_IPADDR, FT_UINT32, FT_BYTES, FT_TEXT_OR_BYTES,
  40                FT_DDNS, FT_DDNS1, FT_UINT16, FT_TEXT,
  41                FT_UNDEF, FT_DIGEST } type;
  42         int num_present;
  43         int offset;
  44         u_int32_t bit;
  45 };
  46
  47 typedef struct {
  48         unsigned count;
  49         u_int8_t *data;
  50 } failover_option_t;
  51
  52 #define FM_OFFSET(x) (long)(&(((failover_message_t *)0) -> x))
  53
  54 /* Failover message options: */
  55 #define FTO_BINDING_STATUS              1
  56 #define FTB_BINDING_STATUS                      0x00000002
  57 #define FTO_ASSIGNED_IP_ADDRESS         2
  58 #define FTB_ASSIGNED_IP_ADDRESS                 0x00000004
  59 #define FTO_SERVER_ADDR                 3
  60 #define FTB_SERVER_ADDR                         0x00000008
  61 #define FTO_ADDRESSES_TRANSFERRED       4
  62 #define FTB_ADDRESSES_TRANSFERRED               0x00000010
  63 #define FTO_CLIENT_IDENTIFIER           5
  64 #define FTB_CLIENT_IDENTIFIER                   0x00000020
  65 #define FTO_CHADDR                      6
  66 #define FTB_CHADDR                              0x00000040
  67 #define FTO_DDNS                        7
  68 #define FTB_DDNS                                0x00000080
  69 #define FTO_REJECT_REASON               8
  70 #define FTB_REJECT_REASON                       0x00000100
  71 #define FTO_MESSAGE                     9
  72 #define FTB_MESSAGE                             0x00000200
  73 #define FTO_MCLT                        10
  74 #define FTB_MCLT                                0x00000400
  75 #define FTO_VENDOR_CLASS                11
  76 #define FTB_VENDOR_CLASS                        0x00000800
  77 #define FTO_LEASE_EXPIRY                13
  78 #define FTB_LEASE_EXPIRY                        0x00002000
  79 #define FTO_POTENTIAL_EXPIRY            14
  80 #define FTB_POTENTIAL_EXPIRY                    0x00004000
  81 #define FTO_GRACE_EXPIRY                15
  82 #define FTB_GRACE_EXPIRY                        0x00008000
  83 #define FTO_CLTT                        16
  84 #define FTB_CLTT                                0x00010000
  85 #define FTO_STOS                        17
  86 #define FTB_STOS                                0x00020000
  87 #define FTO_SERVER_STATE                18
  88 #define FTB_SERVER_STATE                        0x00040000
  89 #define FTO_SERVER_FLAGS                19
  90 #define FTB_SERVER_FLAGS                        0x00080000
  91 #define FTO_VENDOR_OPTIONS              20
  92 #define FTB_VENDOR_OPTIONS                      0x00100000
  93 #define FTO_MAX_UNACKED                 21
  94 #define FTB_MAX_UNACKED                         0x00200000
  95 #define FTO_RECEIVE_TIMER               23
  96 #define FTB_RECEIVE_TIMER                       0x00800000
  97 #define FTO_HBA                         24
  98 #define FTB_HBA                                 0x01000000
  99 #define FTO_MESSAGE_DIGEST              25
 100 #define FTB_MESSAGE_DIGEST                      0x02000000
 101 #define FTO_PROTOCOL_VERSION            26
 102 #define FTB_PROTOCOL_VERSION                    0x04000000
 103 #define FTO_TLS_REQUEST                 27
 104 #define FTB_TLS_REQUEST                         0x08000000
 105 #define FTO_TLS_REPLY                   28
 106 #define FTB_TLS_REPLY                           0x10000000
 107 #define FTO_REQUEST_OPTIONS             29
 108 #define FTB_REQUEST_OPTIONS                     0x20000000
 109 #define FTO_REPLY_OPTIONS               30
 110 #define FTB_REPLY_OPTIONS                       0x40000000
 111 #define FTO_MAX                         FTO_REPLY_OPTIONS
 112
 113 /* Failover protocol message types: */
 114 #define FTM_POOLREQ             1
 115 #define FTM_POOLRESP            2
 116 #define FTM_BNDUPD              3
 117 #define FTM_BNDACK              4
 118 #define FTM_CONNECT             5
 119 #define FTM_CONNECTACK          6
 120 #define FTM_UPDREQ              7
 121 #define FTM_UPDDONE             8
 122 #define FTM_UPDREQALL           9
 123 #define FTM_STATE               10
 124 #define FTM_CONTACT             11
 125 #define FTM_DISCONNECT          12
 126
 127 /* Reject reasons: */
 128
 129 #define FTR_ILLEGAL_IP_ADDR     1
 130 #define FTR_FATAL_CONFLICT      2
 131 #define FTR_MISSING_BINDINFO    3
 132 #define FTR_TIMEMISMATCH        4
 133 #define FTR_INVALID_MCLT        5
 134 #define FTR_MISC_REJECT         6
 135 #define FTR_DUP_CONNECTION      7
 136 #define FTR_INVALID_PARTNER     8
 137 #define FTR_TLS_UNSUPPORTED     9
 138 #define FTR_TLS_UNCONFIGURED    10
 139 #define FTR_TLS_REQUIRED        11
 140 #define FTR_DIGEST_UNSUPPORTED  12
 141 #define FTR_DIGEST_UNCONFIGURED 13
 142 #define FTR_VERSION_MISMATCH    14
 143 #define FTR_MISSING_BIND_INFO   15
 144 #define FTR_OUTDATED_BIND_INFO  16
 145 #define FTR_LESS_CRIT_BIND_INFO 17
 146 #define FTR_NO_TRAFFIC          18
 147 #define FTR_HBA_CONFLICT        19
 148 #define FTR_UNKNOWN             254
 149
 150 #define DHCP_FAILOVER_MAX_MESSAGE_SIZE  2048
 151
 152 /* Failover server flags. */
 153 #define FTF_STARTUP     1
 154
 155 typedef struct failover_message {
 156         int refcnt;
 157         struct failover_message *next;
 158
 159         u_int8_t type;
 160
 161         u_int8_t binding_status;
 162         u_int8_t protocol_version;
 163         u_int8_t reject_reason;
 164         u_int8_t server_flags;
 165         u_int8_t server_state;
 166         u_int8_t tls_reply;
 167         u_int8_t tls_request;
 168         u_int32_t stos;
 169         u_int32_t time;
 170         u_int32_t xid;
 171         u_int32_t addresses_transferred;
 172         u_int32_t assigned_addr;
 173         u_int32_t client_ltt;
 174         u_int32_t expiry;
 175         u_int32_t grace_expiry;
 176         u_int32_t max_unacked;
 177         u_int32_t mclt;
 178         u_int32_t potential_expiry;
 179         u_int32_t receive_timer;
 180         u_int32_t server_addr;
 181         failover_option_t chaddr;
 182         failover_option_t client_identifier;
 183         failover_option_t hba;
 184         failover_option_t message;
 185         failover_option_t reply_options;
 186         failover_option_t request_options;
 187         ddns_fqdn_t ddns;
 188         failover_option_t vendor_class;
 189         failover_option_t vendor_options;
 190
 191         int options_present;
 192 } failover_message_t;
 193
 194 typedef struct {
 195         OMAPI_OBJECT_PREAMBLE;
 196         struct option_cache *peer_address;
 197         unsigned peer_port;
 198         int options_present;
 199         enum dhcp_flink_state {
 200                 dhcp_flink_start,
 201                 dhcp_flink_message_length_wait,
 202                 dhcp_flink_message_wait,
 203                 dhcp_flink_disconnected,
 204                 dhcp_flink_state_max
 205         } state;
 206         failover_message_t *imsg;
 207         struct _dhcp_failover_state *state_object;
 208         u_int16_t imsg_len;
 209         unsigned imsg_count;
 210         u_int8_t imsg_payoff; /* Pay*load* offset. :') */
 211         u_int32_t xid;
 212 } dhcp_failover_link_t;
 213
 214 typedef struct _dhcp_failover_listener {
 215         OMAPI_OBJECT_PREAMBLE;
 216         struct _dhcp_failover_listener *next;
 217         omapi_addr_t address;
 218 } dhcp_failover_listener_t;
 219 #endif /* FAILOVER_PROTOCOL */
 220
 221 /* A failover peer. */
 222 enum failover_state {
 223         unknown_state,
 224         partner_down,
 225         normal,
 226         communications_interrupted,
 227         resolution_interrupted,
 228         potential_conflict,
 229         recover,
 230         recover_done,
 231         shut_down,
 232         paused,
 233         startup,
 234         recover_wait
 235 };
 236
 237 /* Service states are simplifications of failover states, particularly
 238    useful because the startup state isn't actually implementable as a
 239    seperate failover state without maintaining a state stack. */
 240
 241 enum service_state {
 242         unknown_service_state,
 243         cooperating,
 244         not_cooperating,
 245         service_partner_down,
 246         not_responding,
 247         service_startup
 248 };
 249
 250 #if defined (FAILOVER_PROTOCOL)
 251 typedef struct _dhcp_failover_config {
 252         struct option_cache *address;
 253         int port;
 254         u_int32_t max_flying_updates;
 255         enum failover_state state;
 256         TIME stos;
 257         u_int32_t max_response_delay;
 258 } dhcp_failover_config_t;
 259
 260 typedef struct _dhcp_failover_state {
 261         OMAPI_OBJECT_PREAMBLE;
 262         struct _dhcp_failover_state *next;
 263         char *name;                     /* Name of this failover instance. */
 264         dhcp_failover_config_t me;      /* My configuration. */
 265         dhcp_failover_config_t partner; /* Partner's configuration. */
 266         enum failover_state saved_state; /* Saved state during startup. */
 267         struct data_string server_identifier; /* Server identifier (IP addr) */
 268         u_int32_t mclt;
 269
 270         u_int8_t *hba;  /* Hash bucket array for load balancing. */
 271         int load_balance_max_secs;
 272
 273         enum service_state service_state;
 274         const char *nrr;        /* Printable reason why we're in the
 275                                    not_responding service state (empty
 276                                    string if we are responding. */
 277
 278         dhcp_failover_link_t *link_to_peer;     /* Currently-established link
 279                                                    to peer. */
 280
 281         enum {
 282                 primary, secondary
 283         } i_am;         /* We are primary or secondary in this relationship. */
 284
 285         TIME last_packet_sent;          /* Timestamp on last packet we sent. */
 286         TIME last_timestamp_received;   /* The last timestamp we sent that
 287                                            has been returned by our partner. */
 288         TIME skew;      /* The skew between our clock and our partner's. */
 289         struct lease *update_queue_head; /* List of leases we haven't sent
 290                                             to peer. */
 291         struct lease *update_queue_tail;
 292
 293         struct lease *ack_queue_head;   /* List of lease updates the peer
 294                                            hasn't yet acked. */
 295         struct lease *ack_queue_tail;
 296
 297         struct lease *send_update_done; /* When we get a BNDACK for this
 298                                            lease, send an UPDDONE message. */
 299         int cur_unacked_updates;        /* Number of updates we've sent
 300                                            that have not yet been acked. */
 301
 302                                         /* List of messages which we haven't
 303                                            acked yet. */
 304         failover_message_t *toack_queue_head;
 305         failover_message_t *toack_queue_tail;
 306         int pending_acks;               /* Number of messages in the toack
 307                                            queue. */
 308         int pool_count;                 /* Number of pools referencing this
 309                                            failover state object. */
 310 } dhcp_failover_state_t;
 311
 312 #define DHCP_FAILOVER_VERSION           1
 313 #endif /* FAILOVER_PROTOCOL */