bfdd/bfd.h

   1 /*********************************************************************
   2  * Copyright 2014,2015,2016,2017 Cumulus Networks, Inc.  All rights reserved.
   3  *
   4  * This program is free software; you can redistribute it and/or modify it
   5  * under the terms of the GNU General Public License as published by the Free
   6  * Software Foundation; either version 2 of the License, or (at your option)
   7  * any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  12  * more details.
  13  *
  14  * You should have received a copy of the GNU General Public License along
  15  * with this program; see the file COPYING; if not, write to the Free Software
  16  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  17  *
  18  * bfd.h: implements the BFD protocol.
  19  */
  20
  21 #ifndef _BFD_H_
  22 #define _BFD_H_
  23
  24 #include <netinet/in.h>
  25
  26 #include <stdbool.h>
  27 #include <stdarg.h>
  28 #include <stdint.h>
  29
  30 #include "lib/hash.h"
  31 #include "lib/libfrr.h"
  32 #include "lib/qobj.h"
  33 #include "lib/queue.h"
  34
  35 #include "bfdctl.h"
  36
  37 #define ETHERNET_ADDRESS_LENGTH 6
  38
  39 #ifdef BFD_DEBUG
  40 #define BFDD_JSON_CONV_OPTIONS (JSON_C_TO_STRING_PRETTY)
  41 #else
  42 #define BFDD_JSON_CONV_OPTIONS (0)
  43 #endif
  44
  45 DECLARE_MGROUP(BFDD);
  46 DECLARE_MTYPE(BFDD_TMP);
  47 DECLARE_MTYPE(BFDD_CONFIG);
  48 DECLARE_MTYPE(BFDD_LABEL);
  49 DECLARE_MTYPE(BFDD_CONTROL);
  50 DECLARE_MTYPE(BFDD_NOTIFICATION);
  51
  52 struct bfd_timers {
  53         uint32_t desired_min_tx;
  54         uint32_t required_min_rx;
  55         uint32_t required_min_echo;
  56 };
  57
  58 struct bfd_discrs {
  59         uint32_t my_discr;
  60         uint32_t remote_discr;
  61 };
  62
  63 /*
  64  * Format of control packet.  From section 4)
  65  */
  66 struct bfd_pkt {
  67         union {
  68                 uint32_t byteFields;
  69                 struct {
  70                         uint8_t diag;
  71                         uint8_t flags;
  72                         uint8_t detect_mult;
  73                         uint8_t len;
  74                 };
  75         };
  76         struct bfd_discrs discrs;
  77         struct bfd_timers timers;
  78 };
  79
  80 /*
  81  * Format of Echo packet.
  82  */
  83 struct bfd_echo_pkt {
  84         union {
  85                 uint32_t byteFields;
  86                 struct {
  87                         uint8_t ver;
  88                         uint8_t len;
  89                         uint16_t reserved;
  90                 };
  91         };
  92         uint32_t my_discr;
  93         uint8_t pad[16];
  94 };
  95
  96
  97 /* Macros for manipulating control packets */
  98 #define BFD_VERMASK 0x03
  99 #define BFD_DIAGMASK 0x1F
 100 #define BFD_GETVER(diag) ((diag >> 5) & BFD_VERMASK)
 101 #define BFD_SETVER(diag, val) ((diag) |= (val & BFD_VERMASK) << 5)
 102 #define BFD_VERSION 1
 103 #define BFD_PBIT 0x20
 104 #define BFD_FBIT 0x10
 105 #define BFD_CBIT 0x08
 106 #define BFD_ABIT 0x04
 107 #define BFD_DEMANDBIT 0x02
 108 #define BFD_SETDEMANDBIT(flags, val)                                           \
 109         {                                                                      \
 110                 if ((val))                                                     \
 111                         flags |= BFD_DEMANDBIT;                                \
 112         }
 113 #define BFD_SETPBIT(flags, val)                                                \
 114         {                                                                      \
 115                 if ((val))                                                     \
 116                         flags |= BFD_PBIT;                                     \
 117         }
 118 #define BFD_GETPBIT(flags) (flags & BFD_PBIT)
 119 #define BFD_SETFBIT(flags, val)                                                \
 120         {                                                                      \
 121                 if ((val))                                                     \
 122                         flags |= BFD_FBIT;                                     \
 123         }
 124 #define BFD_GETFBIT(flags) (flags & BFD_FBIT)
 125 #define BFD_SETSTATE(flags, val)                                               \
 126         {                                                                      \
 127                 if ((val))                                                     \
 128                         flags |= (val & 0x3) << 6;                             \
 129         }
 130 #define BFD_GETSTATE(flags) ((flags >> 6) & 0x3)
 131 #define BFD_ECHO_VERSION 1
 132 #define BFD_ECHO_PKT_LEN sizeof(struct bfd_echo_pkt)
 133 #define BFD_CTRL_PKT_LEN sizeof(struct bfd_pkt)
 134 #define IP_HDR_LEN 20
 135 #define UDP_HDR_LEN 8
 136 #define ETH_HDR_LEN 14
 137 #define HEADERS_MIN_LEN (ETH_HDR_LEN + IP_HDR_LEN + UDP_HDR_LEN)
 138 #define BFD_ECHO_PKT_TOT_LEN                                                   \
 139         ((int)(ETH_HDR_LEN + IP_HDR_LEN + UDP_HDR_LEN + BFD_ECHO_PKT_LEN))
 140 #define BFD_RX_BUF_LEN 160
 141
 142 enum bfd_diagnosticis {
 143         BD_OK = 0,
 144         /* Control Detection Time Expired. */
 145         BD_CONTROL_EXPIRED = 1,
 146         /* Echo Function Failed. */
 147         BD_ECHO_FAILED = 2,
 148         /* Neighbor Signaled Session Down. */
 149         BD_NEIGHBOR_DOWN = 3,
 150         /* Forwarding Plane Reset. */
 151         BD_FORWARDING_RESET = 4,
 152         /* Path Down. */
 153         BD_PATH_DOWN = 5,
 154         /* Concatenated Path Down. */
 155         BD_CONCATPATH_DOWN = 6,
 156         /* Administratively Down. */
 157         BD_ADMIN_DOWN = 7,
 158         /* Reverse Concatenated Path Down. */
 159         BD_REVCONCATPATH_DOWN = 8,
 160         /* 9..31: reserved. */
 161 };
 162
 163 /* BFD session flags */
 164 enum bfd_session_flags {
 165         BFD_SESS_FLAG_NONE = 0,
 166         BFD_SESS_FLAG_ECHO = 1 << 0,    /* BFD Echo functionality */
 167         BFD_SESS_FLAG_ECHO_ACTIVE = 1 << 1, /* BFD Echo Packets are being sent
 168                                              * actively
 169                                              */
 170         BFD_SESS_FLAG_MH = 1 << 2,        /* BFD Multi-hop session */
 171         BFD_SESS_FLAG_IPV6 = 1 << 4,    /* BFD IPv6 session */
 172         BFD_SESS_FLAG_SEND_EVT_ACTIVE = 1 << 5, /* send event timer active */
 173         BFD_SESS_FLAG_SEND_EVT_IGNORE = 1 << 6, /* ignore send event when timer
 174                                                  * expires
 175                                                  */
 176         BFD_SESS_FLAG_SHUTDOWN = 1 << 7,        /* disable BGP peer function */
 177 };
 178
 179 #define BFD_SET_FLAG(field, flag) (field |= flag)
 180 #define BFD_UNSET_FLAG(field, flag) (field &= ~flag)
 181 #define BFD_CHECK_FLAG(field, flag) (field & flag)
 182
 183 /* BFD session hash keys */
 184 struct bfd_shop_key {
 185         struct sockaddr_any peer;
 186         char port_name[MAXNAMELEN + 1];
 187 };
 188
 189 struct bfd_mhop_key {
 190         struct sockaddr_any peer;
 191         struct sockaddr_any local;
 192         char vrf_name[MAXNAMELEN + 1];
 193 };
 194
 195 struct bfd_session_stats {
 196         uint64_t rx_ctrl_pkt;
 197         uint64_t tx_ctrl_pkt;
 198         uint64_t rx_echo_pkt;
 199         uint64_t tx_echo_pkt;
 200         uint64_t session_up;
 201         uint64_t session_down;
 202         uint64_t znotification;
 203 };
 204
 205 /* bfd_session shortcut label forwarding. */
 206 struct peer_label;
 207
 208 /*
 209  * Session state information
 210  */
 211 struct bfd_session {
 212
 213         /* protocol state per RFC 5880*/
 214         uint8_t ses_state;
 215         struct bfd_discrs discrs;
 216         uint8_t local_diag;
 217         uint8_t demand_mode;
 218         uint8_t detect_mult;
 219         uint8_t remote_detect_mult;
 220         uint8_t mh_ttl;
 221
 222         /* Timers */
 223         struct bfd_timers timers;
 224         struct bfd_timers new_timers;
 225         uint32_t up_min_tx;
 226         uint64_t detect_TO;
 227         struct thread *echo_recvtimer_ev;
 228         struct thread *recvtimer_ev;
 229         uint64_t xmt_TO;
 230         uint64_t echo_xmt_TO;
 231         struct thread *xmttimer_ev;
 232         struct thread *echo_xmttimer_ev;
 233         uint64_t echo_detect_TO;
 234
 235         /* software object state */
 236         uint8_t polling;
 237
 238         /* This and the localDiscr are the keys to state info */
 239         struct peer_label *pl;
 240         union {
 241                 struct bfd_shop_key shop;
 242                 struct bfd_mhop_key mhop;
 243         };
 244         int sock;
 245
 246         struct sockaddr_any local_address;
 247         struct sockaddr_any local_ip;
 248         int ifindex;
 249         uint8_t local_mac[ETHERNET_ADDRESS_LENGTH];
 250         uint8_t peer_mac[ETHERNET_ADDRESS_LENGTH];
 251         uint16_t ip_id;
 252
 253         /* BFD session flags */
 254         enum bfd_session_flags flags;
 255
 256         uint8_t echo_pkt[BFD_ECHO_PKT_TOT_LEN]; /* Save the Echo Packet
 257                                                  * which will be transmitted
 258                                                  */
 259         struct bfd_session_stats stats;
 260
 261         struct timeval uptime;   /* last up time */
 262         struct timeval downtime; /* last down time */
 263
 264         /* Remote peer data (for debugging mostly) */
 265         uint8_t remote_diag;
 266         struct bfd_timers remote_timers;
 267
 268         uint64_t refcount; /* number of pointers referencing this. */
 269
 270         /* VTY context data. */
 271         QOBJ_FIELDS;
 272 };
 273 DECLARE_QOBJ_TYPE(bfd_session);
 274
 275 struct peer_label {
 276         TAILQ_ENTRY(peer_label) pl_entry;
 277
 278         struct bfd_session *pl_bs;
 279         char pl_label[MAXNAMELEN];
 280 };
 281 TAILQ_HEAD(pllist, peer_label);
 282
 283 struct bfd_diag_str_list {
 284         const char *str;
 285         int type;
 286 };
 287
 288 struct bfd_state_str_list {
 289         const char *str;
 290         int type;
 291 };
 292
 293 struct bfd_vrf {
 294         int vrf_id;
 295         char name[MAXNAMELEN + 1];
 296 } bfd_vrf;
 297
 298 struct bfd_iface {
 299         int vrf_id;
 300         char ifname[MAXNAMELEN + 1];
 301 } bfd_iface;
 302
 303
 304 /* States defined per 4.1 */
 305 #define PTM_BFD_ADM_DOWN 0
 306 #define PTM_BFD_DOWN 1
 307 #define PTM_BFD_INIT 2
 308 #define PTM_BFD_UP 3
 309
 310
 311 /* Various constants */
 312 /* Retrieved from ptm_timer.h from Cumulus PTM sources. */
 313 #define MSEC_PER_SEC 1000L
 314 #define NSEC_PER_MSEC 1000000L
 315
 316 #define BFD_DEF_DEMAND 0
 317 #define BFD_DEFDETECTMULT 3
 318 #define BFD_DEFDESIREDMINTX (300 * MSEC_PER_SEC)
 319 #define BFD_DEFREQUIREDMINRX (300 * MSEC_PER_SEC)
 320 #define BFD_DEF_REQ_MIN_ECHO (50 * MSEC_PER_SEC)
 321 #define BFD_DEF_SLOWTX (2000 * MSEC_PER_SEC)
 322 #define BFD_DEF_MHOP_TTL 5
 323 #define BFD_PKT_LEN 24 /* Length of control packet */
 324 #define BFD_TTL_VAL 255
 325 #define BFD_RCV_TTL_VAL 1
 326 #define BFD_TOS_VAL 0xC0
 327 #define BFD_PKT_INFO_VAL 1
 328 #define BFD_IPV6_PKT_INFO_VAL 1
 329 #define BFD_IPV6_ONLY_VAL 1
 330 #define BFD_SRCPORTINIT 49142
 331 #define BFD_SRCPORTMAX 65536
 332 #define BFD_DEFDESTPORT 3784
 333 #define BFD_DEF_ECHO_PORT 3785
 334 #define BFD_DEF_MHOP_DEST_PORT 4784
 335 #define BFD_CMD_STRING_LEN (MAXNAMELEN + 50)
 336 #define BFD_BUFFER_LEN (BFD_CMD_STRING_LEN + MAXNAMELEN + 1)
 337
 338 /*
 339  * control.c
 340  *
 341  * Daemon control code to speak with local consumers.
 342  */
 343
 344 /* See 'bfdctrl.h' for client protocol definitions. */
 345
 346 struct bfd_control_buffer {
 347         size_t bcb_left;
 348         size_t bcb_pos;
 349         union {
 350                 struct bfd_control_msg *bcb_bcm;
 351                 uint8_t *bcb_buf;
 352         };
 353 };
 354
 355 struct bfd_control_queue {
 356         TAILQ_ENTRY(bfd_control_queue) bcq_entry;
 357
 358         struct bfd_control_buffer bcq_bcb;
 359 };
 360 TAILQ_HEAD(bcqueue, bfd_control_queue);
 361
 362 struct bfd_notify_peer {
 363         TAILQ_ENTRY(bfd_notify_peer) bnp_entry;
 364
 365         struct bfd_session *bnp_bs;
 366 };
 367 TAILQ_HEAD(bnplist, bfd_notify_peer);
 368
 369 struct bfd_control_socket {
 370         TAILQ_ENTRY(bfd_control_socket) bcs_entry;
 371
 372         int bcs_sd;
 373         struct thread *bcs_ev;
 374         struct thread *bcs_outev;
 375         struct bcqueue bcs_bcqueue;
 376
 377         /* Notification data */
 378         uint64_t bcs_notify;
 379         struct bnplist bcs_bnplist;
 380
 381         enum bc_msg_version bcs_version;
 382         enum bc_msg_type bcs_type;
 383
 384         /* Message buffering */
 385         struct bfd_control_buffer bcs_bin;
 386         struct bfd_control_buffer *bcs_bout;
 387 };
 388 TAILQ_HEAD(bcslist, bfd_control_socket);
 389
 390 int control_init(const char *path);
 391 void control_shutdown(void);
 392 int control_notify(struct bfd_session *bs);
 393 int control_notify_config(const char *op, struct bfd_session *bs);
 394 int control_accept(struct thread *t);
 395
 396
 397 /*
 398  * bfdd.c
 399  *
 400  * Daemon specific code.
 401  */
 402 struct bfd_global {
 403         int bg_shop;
 404         int bg_mhop;
 405         int bg_shop6;
 406         int bg_mhop6;
 407         int bg_echo;
 408         struct thread *bg_ev[6];
 409
 410         int bg_csock;
 411         struct thread *bg_csockev;
 412         struct bcslist bg_bcslist;
 413
 414         struct pllist bg_pllist;
 415 };
 416 extern struct bfd_global bglobal;
 417 extern struct bfd_diag_str_list diag_list[];
 418 extern struct bfd_state_str_list state_list[];
 419
 420 void socket_close(int *s);
 421
 422
 423 /*
 424  * config.c
 425  *
 426  * Contains the code related with loading/reloading configuration.
 427  */
 428 int parse_config(const char *fname);
 429 int config_request_add(const char *jsonstr);
 430 int config_request_del(const char *jsonstr);
 431 char *config_response(const char *status, const char *error);
 432 char *config_notify(struct bfd_session *bs);
 433 char *config_notify_config(const char *op, struct bfd_session *bs);
 434
 435 typedef int (*bpc_handle)(struct bfd_peer_cfg *, void *arg);
 436 int config_notify_request(struct bfd_control_socket *bcs, const char *jsonstr,
 437                           bpc_handle bh);
 438
 439 struct peer_label *pl_new(const char *label, struct bfd_session *bs);
 440 struct peer_label *pl_find(const char *label);
 441 void pl_free(struct peer_label *pl);
 442
 443
 444 /*
 445  * log.c
 446  *
 447  * Contains code that does the logging procedures. Might implement multiple
 448  * backends (e.g. zebra log, syslog or other logging lib).
 449  */
 450 enum blog_level {
 451         /* level vs syslog equivalent */
 452         BLOG_DEBUG = 0,   /* LOG_DEBUG */
 453         BLOG_INFO = 1,    /* LOG_INFO */
 454         BLOG_WARNING = 2, /* LOG_WARNING */
 455         BLOG_ERROR = 3,   /* LOG_ERR */
 456         BLOG_FATAL = 4,   /* LOG_CRIT */
 457 };
 458
 459 void log_init(int foreground, enum blog_level level,
 460               struct frr_daemon_info *fdi);
 461 void log_info(const char *fmt, ...);
 462 void log_debug(const char *fmt, ...);
 463 void log_warning(const char *fmt, ...);
 464 void log_error(const char *fmt, ...);
 465 void log_fatal(const char *fmt, ...);
 466
 467
 468 /*
 469  * bfd_packet.c
 470  *
 471  * Contains the code related with receiving/seding, packing/unpacking BFD data.
 472  */
 473 int bp_set_ttlv6(int sd, uint8_t value);
 474 int bp_set_ttl(int sd, uint8_t value);
 475 int bp_set_tosv6(int sd, uint8_t value);
 476 int bp_set_tos(int sd, uint8_t value);
 477 int bp_bind_dev(int sd, const char *dev);
 478
 479 int bp_udp_shop(void);
 480 int bp_udp_mhop(void);
 481 int bp_udp6_shop(void);
 482 int bp_udp6_mhop(void);
 483 int bp_peer_socket(struct bfd_peer_cfg *bpc);
 484 int bp_peer_socketv6(struct bfd_peer_cfg *bpc);
 485
 486 void ptm_bfd_snd(struct bfd_session *bfd, int fbit);
 487 void ptm_bfd_echo_snd(struct bfd_session *bfd);
 488
 489 int bfd_recv_cb(struct thread *t);
 490
 491 uint16_t checksum(uint16_t *buf, int len);
 492
 493
 494 /*
 495  * event.c
 496  *
 497  * Contains the code related with event loop.
 498  */
 499 typedef void (*bfd_ev_cb)(struct thread *t);
 500
 501 void bfd_recvtimer_update(struct bfd_session *bs);
 502 void bfd_echo_recvtimer_update(struct bfd_session *bs);
 503 void bfd_xmttimer_update(struct bfd_session *bs, uint64_t jitter);
 504 void bfd_echo_xmttimer_update(struct bfd_session *bs, uint64_t jitter);
 505
 506 void bfd_xmttimer_delete(struct bfd_session *bs);
 507 void bfd_echo_xmttimer_delete(struct bfd_session *bs);
 508 void bfd_recvtimer_delete(struct bfd_session *bs);
 509 void bfd_echo_recvtimer_delete(struct bfd_session *bs);
 510
 511 void bfd_recvtimer_assign(struct bfd_session *bs, bfd_ev_cb cb, int sd);
 512 void bfd_echo_recvtimer_assign(struct bfd_session *bs, bfd_ev_cb cb, int sd);
 513 void bfd_xmttimer_assign(struct bfd_session *bs, bfd_ev_cb cb);
 514 void bfd_echo_xmttimer_assign(struct bfd_session *bs, bfd_ev_cb cb);
 515
 516
 517 /*
 518  * bfd.c
 519  *
 520  * BFD protocol specific code.
 521  */
 522 struct bfd_session *ptm_bfd_sess_new(struct bfd_peer_cfg *bpc);
 523 int ptm_bfd_ses_del(struct bfd_peer_cfg *bpc);
 524 void ptm_bfd_ses_dn(struct bfd_session *bfd, uint8_t diag);
 525 void ptm_bfd_ses_up(struct bfd_session *bfd);
 526 void fetch_portname_from_ifindex(int ifindex, char *ifname, size_t ifnamelen);
 527 void ptm_bfd_echo_stop(struct bfd_session *bfd, int polling);
 528 void ptm_bfd_echo_start(struct bfd_session *bfd);
 529 void ptm_bfd_xmt_TO(struct bfd_session *bfd, int fbit);
 530 void ptm_bfd_start_xmt_timer(struct bfd_session *bfd, bool is_echo);
 531 struct bfd_session *ptm_bfd_sess_find(struct bfd_pkt *cp, char *port_name,
 532                                       struct sockaddr_any *peer,
 533                                       struct sockaddr_any *local,
 534                                       char *vrf_name, bool is_mhop);
 535
 536 struct bfd_session *bs_peer_find(struct bfd_peer_cfg *bpc);
 537 int bfd_session_update_label(struct bfd_session *bs, const char *nlabel);
 538 void bfd_set_polling(struct bfd_session *bs);
 539 const char *satostr(struct sockaddr_any *sa);
 540 const char *diag2str(uint8_t diag);
 541 int strtosa(const char *addr, struct sockaddr_any *sa);
 542 void integer2timestr(uint64_t time, char *buf, size_t buflen);
 543 const char *bs_to_string(struct bfd_session *bs);
 544
 545 /* BFD hash data structures interface */
 546 void bfd_initialize(void);
 547 void bfd_shutdown(void);
 548 struct bfd_session *bfd_id_lookup(uint32_t id);
 549 struct bfd_session *bfd_shop_lookup(struct bfd_shop_key shop);
 550 struct bfd_session *bfd_mhop_lookup(struct bfd_mhop_key mhop);
 551 struct bfd_vrf *bfd_vrf_lookup(int vrf_id);
 552 struct bfd_iface *bfd_iface_lookup(const char *ifname);
 553
 554 struct bfd_session *bfd_id_delete(uint32_t id);
 555 struct bfd_session *bfd_shop_delete(struct bfd_shop_key shop);
 556 struct bfd_session *bfd_mhop_delete(struct bfd_mhop_key mhop);
 557 struct bfd_vrf *bfd_vrf_delete(int vrf_id);
 558 struct bfd_iface *bfd_iface_delete(const char *ifname);
 559
 560 bool bfd_id_insert(struct bfd_session *bs);
 561 bool bfd_shop_insert(struct bfd_session *bs);
 562 bool bfd_mhop_insert(struct bfd_session *bs);
 563 bool bfd_vrf_insert(struct bfd_vrf *vrf);
 564 bool bfd_iface_insert(struct bfd_iface *iface);
 565
 566 typedef void (*hash_iter_func)(struct hash_backet *hb, void *arg);
 567 void bfd_id_iterate(hash_iter_func hif, void *arg);
 568 void bfd_shop_iterate(hash_iter_func hif, void *arg);
 569 void bfd_mhop_iterate(hash_iter_func hif, void *arg);
 570 void bfd_vrf_iterate(hash_iter_func hif, void *arg);
 571 void bfd_iface_iterate(hash_iter_func hif, void *arg);
 572
 573 /* Export callback functions for `event.c`. */
 574 extern struct thread_master *master;
 575
 576 int bfd_recvtimer_cb(struct thread *t);
 577 int bfd_echo_recvtimer_cb(struct thread *t);
 578 int bfd_xmt_cb(struct thread *t);
 579 int bfd_echo_xmt_cb(struct thread *t);
 580
 581
 582 /*
 583  * bfdd_vty.c
 584  *
 585  * BFD daemon vty shell commands.
 586  */
 587 void bfdd_vty_init(void);
 588
 589
 590 /*
 591  * ptm_adapter.c
 592  */
 593 void bfdd_zclient_init(struct zebra_privs_t *bfdd_priv);
 594 void bfdd_zclient_stop(void);
 595
 596 int ptm_bfd_notify(struct bfd_session *bs);
 597
 598
 599 /*
 600  * OS compatibility functions.
 601  */
 602 struct udp_psuedo_header {
 603         uint32_t saddr;
 604         uint32_t daddr;
 605         uint8_t reserved;
 606         uint8_t protocol;
 607         uint16_t len;
 608 };
 609
 610 #define UDP_PSUEDO_HDR_LEN sizeof(struct udp_psuedo_header)
 611
 612 #if defined(BFD_LINUX) || defined(BFD_BSD)
 613 int ptm_bfd_fetch_ifindex(const char *ifname);
 614 void ptm_bfd_fetch_local_mac(const char *ifname, uint8_t *mac);
 615 void fetch_portname_from_ifindex(int ifindex, char *ifname, size_t ifnamelen);
 616 int ptm_bfd_echo_sock_init(void);
 617 #endif /* BFD_LINUX || BFD_BSD */
 618
 619 #ifdef BFD_LINUX
 620 uint16_t udp4_checksum(struct iphdr *iph, uint8_t *buf, int len);
 621 #endif /* BFD_LINUX */
 622
 623 #ifdef BFD_BSD
 624 uint16_t udp4_checksum(struct ip *ip, uint8_t *buf, int len);
 625 ssize_t bsd_echo_sock_read(int sd, uint8_t *buf, ssize_t *buflen,
 626                            struct sockaddr_storage *ss, socklen_t *sslen,
 627                            uint8_t *ttl, uint32_t *id);
 628 #endif /* BFD_BSD */
 629
 630 #endif /* _BFD_H_ */