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         /*
 229          * ifindex of parent interface, if any
 230          */
 231         ifindex_t link_ifindex;
 232 #define IFINDEX_INTERNAL        0
 233
 234         /* Zebra internal interface status */
 235         uint8_t status;
 236 #define ZEBRA_INTERFACE_ACTIVE     (1 << 0)
 237 #define ZEBRA_INTERFACE_SUB        (1 << 1)
 238 #define ZEBRA_INTERFACE_LINKDETECTION (1 << 2)
 239 #define ZEBRA_INTERFACE_VRF_LOOPBACK (1 << 3)
 240
 241         /* Interface flags. */
 242         uint64_t flags;
 243
 244         /* Interface metric */
 245         uint32_t metric;
 246
 247         /* Interface Speed in Mb/s */
 248         uint32_t speed;
 249
 250         /* Interface MTU. */
 251         unsigned int mtu; /* IPv4 MTU */
 252         unsigned int
 253                 mtu6; /* IPv6 MTU - probably, but not neccessarily same as mtu
 254                          */
 255
 256         /* Link-layer information and hardware address */
 257         enum zebra_link_type ll_type;
 258         uint8_t hw_addr[INTERFACE_HWADDR_MAX];
 259         int hw_addr_len;
 260
 261         /* interface bandwidth, kbits */
 262         unsigned int bandwidth;
 263
 264         /* Link parameters for Traffic Engineering */
 265         struct if_link_params *link_params;
 266
 267         /* description of the interface. */
 268         char *desc;
 269
 270         /* Distribute list. */
 271         void *distribute_in;
 272         void *distribute_out;
 273
 274         /* Connected address list. */
 275         struct list *connected;
 276
 277         /* Neighbor connected address list. */
 278         struct list *nbr_connected;
 279
 280         /* Daemon specific interface data pointer. */
 281         void *info;
 282
 283         char ptm_enable; /* Should we look at ptm_status ? */
 284         char ptm_status;
 285
 286 /* Statistics fileds. */
 287 #ifdef HAVE_PROC_NET_DEV
 288         struct if_stats stats;
 289 #endif /* HAVE_PROC_NET_DEV */
 290 #ifdef HAVE_NET_RT_IFLIST
 291         struct if_data stats;
 292 #endif /* HAVE_NET_RT_IFLIST */
 293
 294         struct route_node *node;
 295         vrf_id_t vrf_id;
 296
 297         QOBJ_FIELDS
 298 };
 299
 300 RB_HEAD(if_name_head, interface);
 301 RB_PROTOTYPE(if_name_head, interface, name_entry, if_cmp_func)
 302 RB_HEAD(if_index_head, interface);
 303 RB_PROTOTYPE(if_index_head, interface, index_entry, if_cmp_func)
 304 DECLARE_QOBJ_TYPE(interface)
 305
 306 #define IFNAME_RB_INSERT(vrf, ifp)                                             \
 307         if (RB_INSERT(if_name_head, &vrf->ifaces_by_name, (ifp)))              \
 308                 flog_err(EC_LIB_INTERFACE,                                     \
 309                          "%s(%s): corruption detected -- interface with this " \
 310                          "name exists already in VRF %u!",                     \
 311                          __func__, (ifp)->name, (ifp)->vrf_id);
 312
 313 #define IFNAME_RB_REMOVE(vrf, ifp)                                             \
 314         if (RB_REMOVE(if_name_head, &vrf->ifaces_by_name, (ifp)) == NULL)      \
 315                 flog_err(EC_LIB_INTERFACE,                                     \
 316                          "%s(%s): corruption detected -- interface with this " \
 317                          "name doesn't exist in VRF %u!",                      \
 318                          __func__, (ifp)->name, (ifp)->vrf_id);
 319
 320 #define IFINDEX_RB_INSERT(vrf, ifp)                                            \
 321         if (RB_INSERT(if_index_head, &vrf->ifaces_by_index, (ifp)))            \
 322                 flog_err(EC_LIB_INTERFACE,                                     \
 323                          "%s(%u): corruption detected -- interface with this " \
 324                          "ifindex exists already in VRF %u!",                  \
 325                          __func__, (ifp)->ifindex, (ifp)->vrf_id);
 326
 327 #define IFINDEX_RB_REMOVE(vrf, ifp)                                            \
 328         if (RB_REMOVE(if_index_head, &vrf->ifaces_by_index, (ifp)) == NULL)    \
 329                 flog_err(EC_LIB_INTERFACE,                                     \
 330                          "%s(%u): corruption detected -- interface with this " \
 331                          "ifindex doesn't exist in VRF %u!",                   \
 332                          __func__, (ifp)->ifindex, (ifp)->vrf_id);
 333
 334 #define FOR_ALL_INTERFACES(vrf, ifp)                                           \
 335         if (vrf)                                                               \
 336                 RB_FOREACH (ifp, if_name_head, &vrf->ifaces_by_name)
 337
 338 #define FOR_ALL_INTERFACES_ADDRESSES(ifp, connected, node)                     \
 339         for (ALL_LIST_ELEMENTS_RO(ifp->connected, node, connected))
 340
 341 /* called from the library code whenever interfaces are created/deleted
 342  * note: interfaces may not be fully realized at that point; also they
 343  * may not exist in the system (ifindex = IFINDEX_INTERNAL)
 344  *
 345  * priority values are important here, daemons should be at 0 while modules
 346  * can use 1000+ so they run after the daemon has initialised daemon-specific
 347  * interface data
 348  */
 349 DECLARE_HOOK(if_add, (struct interface * ifp), (ifp))
 350 DECLARE_KOOH(if_del, (struct interface * ifp), (ifp))
 351
 352 #define METRIC_MAX (~0)
 353
 354 /* Connected address structure. */
 355 struct connected {
 356         /* Attached interface. */
 357         struct interface *ifp;
 358
 359         /* Flags for configuration. */
 360         uint8_t conf;
 361 #define ZEBRA_IFC_REAL         (1 << 0)
 362 #define ZEBRA_IFC_CONFIGURED   (1 << 1)
 363 #define ZEBRA_IFC_QUEUED       (1 << 2)
 364         /*
 365            The ZEBRA_IFC_REAL flag should be set if and only if this address
 366            exists in the kernel and is actually usable. (A case where it exists
 367            but
 368            is not yet usable would be IPv6 with DAD)
 369            The ZEBRA_IFC_CONFIGURED flag should be set if and only if this
 370            address
 371            was configured by the user from inside quagga.
 372            The ZEBRA_IFC_QUEUED flag should be set if and only if the address
 373            exists
 374            in the kernel. It may and should be set although the address might
 375            not be
 376            usable yet. (compare with ZEBRA_IFC_REAL)
 377          */
 378
 379         /* Flags for connected address. */
 380         uint8_t flags;
 381 #define ZEBRA_IFA_SECONDARY    (1 << 0)
 382 #define ZEBRA_IFA_PEER         (1 << 1)
 383 #define ZEBRA_IFA_UNNUMBERED   (1 << 2)
 384         /* N.B. the ZEBRA_IFA_PEER flag should be set if and only if
 385            a peer address has been configured.  If this flag is set,
 386            the destination field must contain the peer address.
 387            Otherwise, if this flag is not set, the destination address
 388            will either contain a broadcast address or be NULL.
 389          */
 390
 391         /* Address of connected network. */
 392         struct prefix *address;
 393
 394         /* Peer or Broadcast address, depending on whether ZEBRA_IFA_PEER is
 395            set.
 396            Note: destination may be NULL if ZEBRA_IFA_PEER is not set. */
 397         struct prefix *destination;
 398
 399         /* Label for Linux 2.2.X and upper. */
 400         char *label;
 401
 402         /*
 403          * Used for setting the connected route's cost. If the metric
 404          * here is set to METRIC_MAX the connected route falls back to
 405          * "struct interface"
 406          */
 407         uint32_t metric;
 408 };
 409
 410 /* Nbr Connected address structure. */
 411 struct nbr_connected {
 412         /* Attached interface. */
 413         struct interface *ifp;
 414
 415         /* Address of connected network. */
 416         struct prefix *address;
 417 };
 418
 419 /* Does the destination field contain a peer address? */
 420 #define CONNECTED_PEER(C) CHECK_FLAG((C)->flags, ZEBRA_IFA_PEER)
 421
 422 /* Prefix to insert into the RIB */
 423 #define CONNECTED_PREFIX(C)                                                    \
 424         (CONNECTED_PEER(C) ? (C)->destination : (C)->address)
 425
 426 /* Identifying address.  We guess that if there's a peer address, but the
 427    local address is in the same prefix, then the local address may be unique. */
 428 #define CONNECTED_ID(C)                                                        \
 429         ((CONNECTED_PEER(C) && !prefix_match((C)->destination, (C)->address))  \
 430                  ? (C)->destination                                            \
 431                  : (C)->address)
 432
 433 /* There are some interface flags which are only supported by some
 434    operating system. */
 435
 436 #ifndef IFF_NOTRAILERS
 437 #define IFF_NOTRAILERS 0x0
 438 #endif /* IFF_NOTRAILERS */
 439 #ifndef IFF_OACTIVE
 440 #define IFF_OACTIVE 0x0
 441 #endif /* IFF_OACTIVE */
 442 #ifndef IFF_SIMPLEX
 443 #define IFF_SIMPLEX 0x0
 444 #endif /* IFF_SIMPLEX */
 445 #ifndef IFF_LINK0
 446 #define IFF_LINK0 0x0
 447 #endif /* IFF_LINK0 */
 448 #ifndef IFF_LINK1
 449 #define IFF_LINK1 0x0
 450 #endif /* IFF_LINK1 */
 451 #ifndef IFF_LINK2
 452 #define IFF_LINK2 0x0
 453 #endif /* IFF_LINK2 */
 454 #ifndef IFF_NOXMIT
 455 #define IFF_NOXMIT 0x0
 456 #endif /* IFF_NOXMIT */
 457 #ifndef IFF_NORTEXCH
 458 #define IFF_NORTEXCH 0x0
 459 #endif /* IFF_NORTEXCH */
 460 #ifndef IFF_IPV4
 461 #define IFF_IPV4 0x0
 462 #endif /* IFF_IPV4 */
 463 #ifndef IFF_IPV6
 464 #define IFF_IPV6 0x0
 465 #endif /* IFF_IPV6 */
 466 #ifndef IFF_VIRTUAL
 467 #define IFF_VIRTUAL 0x0
 468 #endif /* IFF_VIRTUAL */
 469
 470 /* Prototypes. */
 471 extern int if_cmp_name_func(const char *p1, const char *p2);
 472
 473 /*
 474  * Passing in VRF_UNKNOWN is a valid thing to do, unless we
 475  * are creating a new interface.
 476  *
 477  * This is useful for vrf route-leaking.  So more than anything
 478  * else think before you use VRF_UNKNOWN
 479  */
 480 extern void if_update_to_new_vrf(struct interface *, vrf_id_t vrf_id);
 481 extern struct interface *if_create(const char *name, vrf_id_t vrf_id);
 482 extern struct interface *if_lookup_by_index(ifindex_t, vrf_id_t vrf_id);
 483 extern struct interface *if_lookup_exact_address(void *matchaddr, int family,
 484                                                  vrf_id_t vrf_id);
 485 extern struct connected *if_lookup_address(void *matchaddr, int family,
 486                                            vrf_id_t vrf_id);
 487 extern struct interface *if_lookup_prefix(struct prefix *prefix,
 488                                           vrf_id_t vrf_id);
 489 size_t if_lookup_by_hwaddr(const uint8_t *hw_addr, size_t addrsz,
 490                            struct interface ***result, vrf_id_t vrf_id);
 491
 492 /* These 3 functions are to be used when the ifname argument is terminated
 493    by a '\0' character: */
 494 extern struct interface *if_lookup_by_name_all_vrf(const char *ifname);
 495 extern struct interface *if_lookup_by_name(const char *ifname, vrf_id_t vrf_id);
 496 extern struct interface *if_get_by_name(const char *ifname, vrf_id_t vrf_id);
 497 extern void if_set_index(struct interface *ifp, ifindex_t ifindex);
 498
 499 /* Delete the interface, but do not free the structure, and leave it in the
 500    interface list.  It is often advisable to leave the pseudo interface
 501    structure because there may be configuration information attached. */
 502 extern void if_delete_retain(struct interface *);
 503
 504 /* Delete and free the interface structure: calls if_delete_retain and then
 505    deletes it from the interface list and frees the structure. */
 506 extern void if_delete(struct interface *);
 507
 508 extern int if_is_up(const struct interface *ifp);
 509 extern int if_is_running(const struct interface *ifp);
 510 extern int if_is_operative(const struct interface *ifp);
 511 extern int if_is_no_ptm_operative(const struct interface *ifp);
 512 extern int if_is_loopback(const struct interface *ifp);
 513 extern int if_is_vrf(const struct interface *ifp);
 514 extern bool if_is_loopback_or_vrf(const struct interface *ifp);
 515 extern int if_is_broadcast(const struct interface *ifp);
 516 extern int if_is_pointopoint(const struct interface *ifp);
 517 extern int if_is_multicast(const struct interface *ifp);
 518 struct vrf;
 519 extern void if_terminate(struct vrf *vrf);
 520 extern void if_dump_all(void);
 521 extern const char *if_flag_dump(unsigned long);
 522 extern const char *if_link_type_str(enum zebra_link_type);
 523
 524 /* Please use ifindex2ifname instead of if_indextoname where possible;
 525    ifindex2ifname uses internal interface info, whereas if_indextoname must
 526    make a system call. */
 527 extern const char *ifindex2ifname(ifindex_t, vrf_id_t vrf_id);
 528
 529 /* Please use ifname2ifindex instead of if_nametoindex where possible;
 530    ifname2ifindex uses internal interface info, whereas if_nametoindex must
 531    make a system call. */
 532 extern ifindex_t ifname2ifindex(const char *ifname, vrf_id_t vrf_id);
 533
 534 /* Connected address functions. */
 535 extern struct connected *connected_new(void);
 536 extern void connected_free(struct connected *);
 537 extern void connected_add(struct interface *, struct connected *);
 538 extern struct connected *
 539 connected_add_by_prefix(struct interface *, struct prefix *, struct prefix *);
 540 extern struct connected *connected_delete_by_prefix(struct interface *,
 541                                                     struct prefix *);
 542 extern struct connected *connected_lookup_prefix(struct interface *,
 543                                                  struct prefix *);
 544 extern struct connected *connected_lookup_prefix_exact(struct interface *,
 545                                                        struct prefix *);
 546 extern struct nbr_connected *nbr_connected_new(void);
 547 extern void nbr_connected_free(struct nbr_connected *);
 548 struct nbr_connected *nbr_connected_check(struct interface *, struct prefix *);
 549 struct connected *connected_get_linklocal(struct interface *ifp);
 550
 551 /* link parameters */
 552 struct if_link_params *if_link_params_get(struct interface *);
 553 void if_link_params_free(struct interface *);
 554
 555 /* Northbound. */
 556 extern void if_cmd_init(void);
 557 extern const struct frr_yang_module_info frr_interface_info;
 558
 559 #ifdef __cplusplus
 560 }
 561 #endif
 562
 563 #endif /* _ZEBRA_IF_H */