lib/if.h

   1 /* Interface related header.
   2  * Copyright (C) 1997, 98, 99 Kunihiro Ishiguro
   3  *
   4  * This file is part of GNU Zebra.
   5  *
   6  * GNU Zebra is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published
   8  * by the Free Software Foundation; either version 2, or (at your
   9  * option) any later version.
  10  *
  11  * GNU Zebra is distributed in the hope that it will be useful, but
  12  * WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License along
  17  * with this program; see the file COPYING; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  19  */
  20
  21 #ifndef _ZEBRA_IF_H
  22 #define _ZEBRA_IF_H
  23
  24 #include "zebra.h"
  25 #include "linklist.h"
  26 #include "memory.h"
  27 #include "qobj.h"
  28 #include "hook.h"
  29
  30 #ifdef __cplusplus
  31 extern "C" {
  32 #endif
  33
  34 DECLARE_MTYPE(IF)
  35 DECLARE_MTYPE(CONNECTED_LABEL)
  36
  37 /* Interface link-layer type, if known. Derived from:
  38  *
  39  * net/if_arp.h on various platforms - Linux especially.
  40  * http://www.iana.org/assignments/arp-parameters/arp-parameters.xhtml
  41  *
  42  * Some of the more obviously defunct technologies left out.
  43  */
  44 enum zebra_link_type {
  45         ZEBRA_LLT_UNKNOWN = 0,
  46         ZEBRA_LLT_ETHER,
  47         ZEBRA_LLT_EETHER,
  48         ZEBRA_LLT_AX25,
  49         ZEBRA_LLT_PRONET,
  50         ZEBRA_LLT_IEEE802,
  51         ZEBRA_LLT_ARCNET,
  52         ZEBRA_LLT_APPLETLK,
  53         ZEBRA_LLT_DLCI,
  54         ZEBRA_LLT_ATM,
  55         ZEBRA_LLT_METRICOM,
  56         ZEBRA_LLT_IEEE1394,
  57         ZEBRA_LLT_EUI64,
  58         ZEBRA_LLT_INFINIBAND,
  59         ZEBRA_LLT_SLIP,
  60         ZEBRA_LLT_CSLIP,
  61         ZEBRA_LLT_SLIP6,
  62         ZEBRA_LLT_CSLIP6,
  63         ZEBRA_LLT_RSRVD,
  64         ZEBRA_LLT_ADAPT,
  65         ZEBRA_LLT_ROSE,
  66         ZEBRA_LLT_X25,
  67         ZEBRA_LLT_PPP,
  68         ZEBRA_LLT_CHDLC,
  69         ZEBRA_LLT_LAPB,
  70         ZEBRA_LLT_RAWHDLC,
  71         ZEBRA_LLT_IPIP,
  72         ZEBRA_LLT_IPIP6,
  73         ZEBRA_LLT_FRAD,
  74         ZEBRA_LLT_SKIP,
  75         ZEBRA_LLT_LOOPBACK,
  76         ZEBRA_LLT_LOCALTLK,
  77         ZEBRA_LLT_FDDI,
  78         ZEBRA_LLT_SIT,
  79         ZEBRA_LLT_IPDDP,
  80         ZEBRA_LLT_IPGRE,
  81         ZEBRA_LLT_IP6GRE,
  82         ZEBRA_LLT_PIMREG,
  83         ZEBRA_LLT_HIPPI,
  84         ZEBRA_LLT_ECONET,
  85         ZEBRA_LLT_IRDA,
  86         ZEBRA_LLT_FCPP,
  87         ZEBRA_LLT_FCAL,
  88         ZEBRA_LLT_FCPL,
  89         ZEBRA_LLT_FCFABRIC,
  90         ZEBRA_LLT_IEEE802_TR,
  91         ZEBRA_LLT_IEEE80211,
  92         ZEBRA_LLT_IEEE80211_RADIOTAP,
  93         ZEBRA_LLT_IEEE802154,
  94         ZEBRA_LLT_IEEE802154_PHY,
  95 };
  96
  97 /*
  98   Interface name length.
  99
 100    Linux define value in /usr/include/linux/if.h.
 101    #define IFNAMSIZ        16
 102
 103    FreeBSD define value in /usr/include/net/if.h.
 104    #define IFNAMSIZ        16
 105 */
 106
 107 #define INTERFACE_NAMSIZ      20
 108 #define INTERFACE_HWADDR_MAX  20
 109
 110 typedef signed int ifindex_t;
 111
 112 #ifdef HAVE_PROC_NET_DEV
 113 struct if_stats {
 114         unsigned long rx_packets;   /* total packets received       */
 115         unsigned long tx_packets;   /* total packets transmitted    */
 116         unsigned long rx_bytes;     /* total bytes received         */
 117         unsigned long tx_bytes;     /* total bytes transmitted      */
 118         unsigned long rx_errors;    /* bad packets received         */
 119         unsigned long tx_errors;    /* packet transmit problems     */
 120         unsigned long rx_dropped;   /* no space in linux buffers    */
 121         unsigned long tx_dropped;   /* no space available in linux  */
 122         unsigned long rx_multicast; /* multicast packets received   */
 123         unsigned long rx_compressed;
 124         unsigned long tx_compressed;
 125         unsigned long collisions;
 126
 127         /* detailed rx_errors: */
 128         unsigned long rx_length_errors;
 129         unsigned long rx_over_errors;   /* receiver ring buff overflow  */
 130         unsigned long rx_crc_errors;    /* recved pkt with crc error    */
 131         unsigned long rx_frame_errors;  /* recv'd frame alignment error */
 132         unsigned long rx_fifo_errors;   /* recv'r fifo overrun          */
 133         unsigned long rx_missed_errors; /* receiver missed packet     */
 134         /* detailed tx_errors */
 135         unsigned long tx_aborted_errors;
 136         unsigned long tx_carrier_errors;
 137         unsigned long tx_fifo_errors;
 138         unsigned long tx_heartbeat_errors;
 139         unsigned long tx_window_errors;
 140 };
 141 #endif /* HAVE_PROC_NET_DEV */
 142
 143 /* Here are "non-official" architectural constants. */
 144 #define TE_EXT_MASK             0x0FFFFFFF
 145 #define TE_EXT_ANORMAL          0x80000000
 146 #define LOSS_PRECISION          0.000003
 147 #define TE_KILO_BIT             1000
 148 #define TE_BYTE                 8
 149 #define DEFAULT_BANDWIDTH       10000
 150 #define MAX_CLASS_TYPE          8
 151 #define MAX_PKT_LOSS            50.331642
 152
 153 /*
 154  * Link Parameters Status:
 155  *  equal to 0: unset
 156  *  different from 0: set
 157  */
 158 #define LP_UNSET                0x0000
 159 #define LP_TE_METRIC            0x0001
 160 #define LP_MAX_BW               0x0002
 161 #define LP_MAX_RSV_BW           0x0004
 162 #define LP_UNRSV_BW             0x0008
 163 #define LP_ADM_GRP              0x0010
 164 #define LP_RMT_AS               0x0020
 165 #define LP_DELAY                0x0040
 166 #define LP_MM_DELAY             0x0080
 167 #define LP_DELAY_VAR            0x0100
 168 #define LP_PKT_LOSS             0x0200
 169 #define LP_RES_BW               0x0400
 170 #define LP_AVA_BW               0x0800
 171 #define LP_USE_BW               0x1000
 172
 173 #define IS_PARAM_UNSET(lp, st) !(lp->lp_status & st)
 174 #define IS_PARAM_SET(lp, st) (lp->lp_status & st)
 175 #define IS_LINK_PARAMS_SET(lp) (lp->lp_status != LP_UNSET)
 176
 177 #define SET_PARAM(lp, st) (lp->lp_status) |= (st)
 178 #define UNSET_PARAM(lp, st) (lp->lp_status) &= ~(st)
 179 #define RESET_LINK_PARAM(lp) (lp->lp_status = LP_UNSET)
 180
 181 /* Link Parameters for Traffic Engineering */
 182 struct if_link_params {
 183         uint32_t lp_status; /* Status of Link Parameters: */
 184         uint32_t te_metric; /* Traffic Engineering metric */
 185         float default_bw;
 186         float max_bw;                   /* Maximum Bandwidth */
 187         float max_rsv_bw;               /* Maximum Reservable Bandwidth */
 188         float unrsv_bw[MAX_CLASS_TYPE]; /* Unreserved Bandwidth per Class Type
 189                                            (8) */
 190         uint32_t admin_grp;             /* Administrative group */
 191         uint32_t rmt_as;                /* Remote AS number */
 192         struct in_addr rmt_ip;          /* Remote IP address */
 193         uint32_t av_delay;              /* Link Average Delay */
 194         uint32_t min_delay;             /* Link Min Delay */
 195         uint32_t max_delay;             /* Link Max Delay */
 196         uint32_t delay_var;             /* Link Delay Variation */
 197         float pkt_loss;                 /* Link Packet Loss */
 198         float res_bw;                   /* Residual Bandwidth */
 199         float ava_bw;                   /* Available Bandwidth */
 200         float use_bw;                   /* Utilized Bandwidth */
 201 };
 202
 203 #define INTERFACE_LINK_PARAMS_SIZE   sizeof(struct if_link_params)
 204 #define HAS_LINK_PARAMS(ifp)  ((ifp)->link_params != NULL)
 205
 206 /* Interface structure */
 207 struct interface {
 208         RB_ENTRY(interface) name_entry, index_entry;
 209
 210         /* Interface name.  This should probably never be changed after the
 211            interface is created, because the configuration info for this
 212            interface
 213            is associated with this structure.  For that reason, the interface
 214            should also never be deleted (to avoid losing configuration info).
 215            To delete, just set ifindex to IFINDEX_INTERNAL to indicate that the
 216            interface does not exist in the kernel.
 217          */
 218         char name[INTERFACE_NAMSIZ];
 219
 220         /* Interface index (should be IFINDEX_INTERNAL for non-kernel or
 221            deleted interfaces).
 222            WARNING: the ifindex needs to be changed using the if_set_index()
 223            function. Failure to respect this will cause corruption in the data
 224            structure used to store the interfaces and if_lookup_by_index() will
 225            not work as expected.
 226          */
 227         ifindex_t ifindex;
 228 #define IFINDEX_INTERNAL        0
 229
 230         /* Zebra internal interface status */
 231         uint8_t status;
 232 #define ZEBRA_INTERFACE_ACTIVE     (1 << 0)
 233 #define ZEBRA_INTERFACE_SUB        (1 << 1)
 234 #define ZEBRA_INTERFACE_LINKDETECTION (1 << 2)
 235 #define ZEBRA_INTERFACE_VRF_LOOPBACK (1 << 3)
 236
 237         /* Interface flags. */
 238         uint64_t flags;
 239
 240         /* Interface metric */
 241         uint32_t metric;
 242
 243         /* Interface Speed in Mb/s */
 244         uint32_t speed;
 245
 246         /* Interface MTU. */
 247         unsigned int mtu; /* IPv4 MTU */
 248         unsigned int
 249                 mtu6; /* IPv6 MTU - probably, but not neccessarily same as mtu
 250                          */
 251
 252         /* Link-layer information and hardware address */
 253         enum zebra_link_type ll_type;
 254         uint8_t hw_addr[INTERFACE_HWADDR_MAX];
 255         int hw_addr_len;
 256
 257         /* interface bandwidth, kbits */
 258         unsigned int bandwidth;
 259
 260         /* Link parameters for Traffic Engineering */
 261         struct if_link_params *link_params;
 262
 263         /* description of the interface. */
 264         char *desc;
 265
 266         /* Distribute list. */
 267         void *distribute_in;
 268         void *distribute_out;
 269
 270         /* Connected address list. */
 271         struct list *connected;
 272
 273         /* Neighbor connected address list. */
 274         struct list *nbr_connected;
 275
 276         /* Daemon specific interface data pointer. */
 277         void *info;
 278
 279         char ptm_enable; /* Should we look at ptm_status ? */
 280         char ptm_status;
 281
 282 /* Statistics fileds. */
 283 #ifdef HAVE_PROC_NET_DEV
 284         struct if_stats stats;
 285 #endif /* HAVE_PROC_NET_DEV */
 286 #ifdef HAVE_NET_RT_IFLIST
 287         struct if_data stats;
 288 #endif /* HAVE_NET_RT_IFLIST */
 289
 290         struct route_node *node;
 291         vrf_id_t vrf_id;
 292
 293         QOBJ_FIELDS
 294 };
 295
 296 RB_HEAD(if_name_head, interface);
 297 RB_PROTOTYPE(if_name_head, interface, name_entry, if_cmp_func)
 298 RB_HEAD(if_index_head, interface);
 299 RB_PROTOTYPE(if_index_head, interface, index_entry, if_cmp_func)
 300 DECLARE_QOBJ_TYPE(interface)
 301
 302 #define IFNAME_RB_INSERT(vrf, ifp)                                             \
 303         if (RB_INSERT(if_name_head, &vrf->ifaces_by_name, (ifp)))              \
 304                 flog_err(EC_LIB_INTERFACE,                                     \
 305                          "%s(%s): corruption detected -- interface with this " \
 306                          "name exists already in VRF %u!",                     \
 307                          __func__, (ifp)->name, (ifp)->vrf_id);
 308
 309 #define IFNAME_RB_REMOVE(vrf, ifp)                                             \
 310         if (RB_REMOVE(if_name_head, &vrf->ifaces_by_name, (ifp)) == NULL)      \
 311                 flog_err(EC_LIB_INTERFACE,                                     \
 312                          "%s(%s): corruption detected -- interface with this " \
 313                          "name doesn't exist in VRF %u!",                      \
 314                          __func__, (ifp)->name, (ifp)->vrf_id);
 315
 316 #define IFINDEX_RB_INSERT(vrf, ifp)                                            \
 317         if (RB_INSERT(if_index_head, &vrf->ifaces_by_index, (ifp)))            \
 318                 flog_err(EC_LIB_INTERFACE,                                     \
 319                          "%s(%u): corruption detected -- interface with this " \
 320                          "ifindex exists already in VRF %u!",                  \
 321                          __func__, (ifp)->ifindex, (ifp)->vrf_id);
 322
 323 #define IFINDEX_RB_REMOVE(vrf, ifp)                                            \
 324         if (RB_REMOVE(if_index_head, &vrf->ifaces_by_index, (ifp)) == NULL)    \
 325                 flog_err(EC_LIB_INTERFACE,                                     \
 326                          "%s(%u): corruption detected -- interface with this " \
 327                          "ifindex doesn't exist in VRF %u!",                   \
 328                          __func__, (ifp)->ifindex, (ifp)->vrf_id);
 329
 330 #define FOR_ALL_INTERFACES(vrf, ifp)                                           \
 331         if (vrf)                                                               \
 332                 RB_FOREACH (ifp, if_name_head, &vrf->ifaces_by_name)
 333
 334 #define FOR_ALL_INTERFACES_ADDRESSES(ifp, connected, node)                     \
 335         for (ALL_LIST_ELEMENTS_RO(ifp->connected, node, connected))
 336
 337 /* called from the library code whenever interfaces are created/deleted
 338  * note: interfaces may not be fully realized at that point; also they
 339  * may not exist in the system (ifindex = IFINDEX_INTERNAL)
 340  *
 341  * priority values are important here, daemons should be at 0 while modules
 342  * can use 1000+ so they run after the daemon has initialised daemon-specific
 343  * interface data
 344  */
 345 DECLARE_HOOK(if_add, (struct interface * ifp), (ifp))
 346 DECLARE_KOOH(if_del, (struct interface * ifp), (ifp))
 347
 348 #define METRIC_MAX (~0)
 349
 350 /* Connected address structure. */
 351 struct connected {
 352         /* Attached interface. */
 353         struct interface *ifp;
 354
 355         /* Flags for configuration. */
 356         uint8_t conf;
 357 #define ZEBRA_IFC_REAL         (1 << 0)
 358 #define ZEBRA_IFC_CONFIGURED   (1 << 1)
 359 #define ZEBRA_IFC_QUEUED       (1 << 2)
 360         /*
 361            The ZEBRA_IFC_REAL flag should be set if and only if this address
 362            exists in the kernel and is actually usable. (A case where it exists
 363            but
 364            is not yet usable would be IPv6 with DAD)
 365            The ZEBRA_IFC_CONFIGURED flag should be set if and only if this
 366            address
 367            was configured by the user from inside quagga.
 368            The ZEBRA_IFC_QUEUED flag should be set if and only if the address
 369            exists
 370            in the kernel. It may and should be set although the address might
 371            not be
 372            usable yet. (compare with ZEBRA_IFC_REAL)
 373          */
 374
 375         /* Flags for connected address. */
 376         uint8_t flags;
 377 #define ZEBRA_IFA_SECONDARY    (1 << 0)
 378 #define ZEBRA_IFA_PEER         (1 << 1)
 379 #define ZEBRA_IFA_UNNUMBERED   (1 << 2)
 380         /* N.B. the ZEBRA_IFA_PEER flag should be set if and only if
 381            a peer address has been configured.  If this flag is set,
 382            the destination field must contain the peer address.
 383            Otherwise, if this flag is not set, the destination address
 384            will either contain a broadcast address or be NULL.
 385          */
 386
 387         /* Address of connected network. */
 388         struct prefix *address;
 389
 390         /* Peer or Broadcast address, depending on whether ZEBRA_IFA_PEER is
 391            set.
 392            Note: destination may be NULL if ZEBRA_IFA_PEER is not set. */
 393         struct prefix *destination;
 394
 395         /* Label for Linux 2.2.X and upper. */
 396         char *label;
 397
 398         /*
 399          * Used for setting the connected route's cost. If the metric
 400          * here is set to METRIC_MAX the connected route falls back to
 401          * "struct interface"
 402          */
 403         uint32_t metric;
 404 };
 405
 406 /* Nbr Connected address structure. */
 407 struct nbr_connected {
 408         /* Attached interface. */
 409         struct interface *ifp;
 410
 411         /* Address of connected network. */
 412         struct prefix *address;
 413 };
 414
 415 /* Does the destination field contain a peer address? */
 416 #define CONNECTED_PEER(C) CHECK_FLAG((C)->flags, ZEBRA_IFA_PEER)
 417
 418 /* Prefix to insert into the RIB */
 419 #define CONNECTED_PREFIX(C)                                                    \
 420         (CONNECTED_PEER(C) ? (C)->destination : (C)->address)
 421
 422 /* Identifying address.  We guess that if there's a peer address, but the
 423    local address is in the same prefix, then the local address may be unique. */
 424 #define CONNECTED_ID(C)                                                        \
 425         ((CONNECTED_PEER(C) && !prefix_match((C)->destination, (C)->address))  \
 426                  ? (C)->destination                                            \
 427                  : (C)->address)
 428
 429 /* There are some interface flags which are only supported by some
 430    operating system. */
 431
 432 #ifndef IFF_NOTRAILERS
 433 #define IFF_NOTRAILERS 0x0
 434 #endif /* IFF_NOTRAILERS */
 435 #ifndef IFF_OACTIVE
 436 #define IFF_OACTIVE 0x0
 437 #endif /* IFF_OACTIVE */
 438 #ifndef IFF_SIMPLEX
 439 #define IFF_SIMPLEX 0x0
 440 #endif /* IFF_SIMPLEX */
 441 #ifndef IFF_LINK0
 442 #define IFF_LINK0 0x0
 443 #endif /* IFF_LINK0 */
 444 #ifndef IFF_LINK1
 445 #define IFF_LINK1 0x0
 446 #endif /* IFF_LINK1 */
 447 #ifndef IFF_LINK2
 448 #define IFF_LINK2 0x0
 449 #endif /* IFF_LINK2 */
 450 #ifndef IFF_NOXMIT
 451 #define IFF_NOXMIT 0x0
 452 #endif /* IFF_NOXMIT */
 453 #ifndef IFF_NORTEXCH
 454 #define IFF_NORTEXCH 0x0
 455 #endif /* IFF_NORTEXCH */
 456 #ifndef IFF_IPV4
 457 #define IFF_IPV4 0x0
 458 #endif /* IFF_IPV4 */
 459 #ifndef IFF_IPV6
 460 #define IFF_IPV6 0x0
 461 #endif /* IFF_IPV6 */
 462 #ifndef IFF_VIRTUAL
 463 #define IFF_VIRTUAL 0x0
 464 #endif /* IFF_VIRTUAL */
 465
 466 /* Prototypes. */
 467 extern int if_cmp_name_func(const char *p1, const char *p2);
 468
 469 /*
 470  * Passing in VRF_UNKNOWN is a valid thing to do, unless we
 471  * are creating a new interface.
 472  *
 473  * This is useful for vrf route-leaking.  So more than anything
 474  * else think before you use VRF_UNKNOWN
 475  */
 476 extern void if_update_to_new_vrf(struct interface *, vrf_id_t vrf_id);
 477 extern struct interface *if_create(const char *name, vrf_id_t vrf_id);
 478 extern struct interface *if_lookup_by_index(ifindex_t, vrf_id_t vrf_id);
 479 extern struct interface *if_lookup_exact_address(void *matchaddr, int family,
 480                                                  vrf_id_t vrf_id);
 481 extern struct connected *if_lookup_address(void *matchaddr, int family,
 482                                            vrf_id_t vrf_id);
 483 extern struct interface *if_lookup_prefix(struct prefix *prefix,
 484                                           vrf_id_t vrf_id);
 485
 486 /* These 3 functions are to be used when the ifname argument is terminated
 487    by a '\0' character: */
 488 extern struct interface *if_lookup_by_name_all_vrf(const char *ifname);
 489 extern struct interface *if_lookup_by_name(const char *ifname, vrf_id_t vrf_id);
 490 extern struct interface *if_get_by_name(const char *ifname, vrf_id_t vrf_id);
 491 extern void if_set_index(struct interface *ifp, ifindex_t ifindex);
 492
 493 /* Delete the interface, but do not free the structure, and leave it in the
 494    interface list.  It is often advisable to leave the pseudo interface
 495    structure because there may be configuration information attached. */
 496 extern void if_delete_retain(struct interface *);
 497
 498 /* Delete and free the interface structure: calls if_delete_retain and then
 499    deletes it from the interface list and frees the structure. */
 500 extern void if_delete(struct interface *);
 501
 502 extern int if_is_up(const struct interface *ifp);
 503 extern int if_is_running(const struct interface *ifp);
 504 extern int if_is_operative(const struct interface *ifp);
 505 extern int if_is_no_ptm_operative(const struct interface *ifp);
 506 extern int if_is_loopback(const struct interface *ifp);
 507 extern int if_is_vrf(const struct interface *ifp);
 508 extern bool if_is_loopback_or_vrf(const struct interface *ifp);
 509 extern int if_is_broadcast(const struct interface *ifp);
 510 extern int if_is_pointopoint(const struct interface *ifp);
 511 extern int if_is_multicast(const struct interface *ifp);
 512 struct vrf;
 513 extern void if_terminate(struct vrf *vrf);
 514 extern void if_dump_all(void);
 515 extern const char *if_flag_dump(unsigned long);
 516 extern const char *if_link_type_str(enum zebra_link_type);
 517
 518 /* Please use ifindex2ifname instead of if_indextoname where possible;
 519    ifindex2ifname uses internal interface info, whereas if_indextoname must
 520    make a system call. */
 521 extern const char *ifindex2ifname(ifindex_t, vrf_id_t vrf_id);
 522
 523 /* Please use ifname2ifindex instead of if_nametoindex where possible;
 524    ifname2ifindex uses internal interface info, whereas if_nametoindex must
 525    make a system call. */
 526 extern ifindex_t ifname2ifindex(const char *ifname, vrf_id_t vrf_id);
 527
 528 /* Connected address functions. */
 529 extern struct connected *connected_new(void);
 530 extern void connected_free(struct connected *);
 531 extern void connected_add(struct interface *, struct connected *);
 532 extern struct connected *
 533 connected_add_by_prefix(struct interface *, struct prefix *, struct prefix *);
 534 extern struct connected *connected_delete_by_prefix(struct interface *,
 535                                                     struct prefix *);
 536 extern struct connected *connected_lookup_prefix(struct interface *,
 537                                                  struct prefix *);
 538 extern struct connected *connected_lookup_prefix_exact(struct interface *,
 539                                                        struct prefix *);
 540 extern struct nbr_connected *nbr_connected_new(void);
 541 extern void nbr_connected_free(struct nbr_connected *);
 542 struct nbr_connected *nbr_connected_check(struct interface *, struct prefix *);
 543
 544 /* link parameters */
 545 struct if_link_params *if_link_params_get(struct interface *);
 546 void if_link_params_free(struct interface *);
 547
 548 /* Northbound. */
 549 extern void if_cmd_init(void);
 550 extern const struct frr_yang_module_info frr_interface_info;
 551
 552 #ifdef __cplusplus
 553 }
 554 #endif
 555
 556 #endif /* _ZEBRA_IF_H */