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
  29 DECLARE_MTYPE(IF)
  30 DECLARE_MTYPE(CONNECTED_LABEL)
  31
  32 /* Interface link-layer type, if known. Derived from:
  33  *
  34  * net/if_arp.h on various platforms - Linux especially.
  35  * http://www.iana.org/assignments/arp-parameters/arp-parameters.xhtml
  36  *
  37  * Some of the more obviously defunct technologies left out.
  38  */
  39 enum zebra_link_type {
  40   ZEBRA_LLT_UNKNOWN = 0,
  41   ZEBRA_LLT_ETHER,
  42   ZEBRA_LLT_EETHER,
  43   ZEBRA_LLT_AX25,
  44   ZEBRA_LLT_PRONET,
  45   ZEBRA_LLT_IEEE802,
  46   ZEBRA_LLT_ARCNET,
  47   ZEBRA_LLT_APPLETLK,
  48   ZEBRA_LLT_DLCI,
  49   ZEBRA_LLT_ATM,
  50   ZEBRA_LLT_METRICOM,
  51   ZEBRA_LLT_IEEE1394,
  52   ZEBRA_LLT_EUI64,
  53   ZEBRA_LLT_INFINIBAND,
  54   ZEBRA_LLT_SLIP,
  55   ZEBRA_LLT_CSLIP,
  56   ZEBRA_LLT_SLIP6,
  57   ZEBRA_LLT_CSLIP6,
  58   ZEBRA_LLT_RSRVD,
  59   ZEBRA_LLT_ADAPT,
  60   ZEBRA_LLT_ROSE,
  61   ZEBRA_LLT_X25,
  62   ZEBRA_LLT_PPP,
  63   ZEBRA_LLT_CHDLC,
  64   ZEBRA_LLT_LAPB,
  65   ZEBRA_LLT_RAWHDLC,
  66   ZEBRA_LLT_IPIP,
  67   ZEBRA_LLT_IPIP6,
  68   ZEBRA_LLT_FRAD,
  69   ZEBRA_LLT_SKIP,
  70   ZEBRA_LLT_LOOPBACK,
  71   ZEBRA_LLT_LOCALTLK,
  72   ZEBRA_LLT_FDDI,
  73   ZEBRA_LLT_SIT,
  74   ZEBRA_LLT_IPDDP,
  75   ZEBRA_LLT_IPGRE,
  76   ZEBRA_LLT_IP6GRE,
  77   ZEBRA_LLT_PIMREG,
  78   ZEBRA_LLT_HIPPI,
  79   ZEBRA_LLT_ECONET,
  80   ZEBRA_LLT_IRDA,
  81   ZEBRA_LLT_FCPP,
  82   ZEBRA_LLT_FCAL,
  83   ZEBRA_LLT_FCPL,
  84   ZEBRA_LLT_FCFABRIC,
  85   ZEBRA_LLT_IEEE802_TR,
  86   ZEBRA_LLT_IEEE80211,
  87   ZEBRA_LLT_IEEE80211_RADIOTAP,
  88   ZEBRA_LLT_IEEE802154,
  89   ZEBRA_LLT_IEEE802154_PHY,
  90 };
  91
  92 /*
  93   Interface name length.
  94
  95    Linux define value in /usr/include/linux/if.h.
  96    #define IFNAMSIZ        16
  97
  98    FreeBSD define value in /usr/include/net/if.h.
  99    #define IFNAMSIZ        16
 100 */
 101
 102 #define INTERFACE_NAMSIZ      20
 103 #define INTERFACE_HWADDR_MAX  20
 104
 105 typedef signed int ifindex_t;
 106
 107 #ifdef HAVE_PROC_NET_DEV
 108 struct if_stats
 109 {
 110   unsigned long rx_packets;   /* total packets received       */
 111   unsigned long tx_packets;   /* total packets transmitted    */
 112   unsigned long rx_bytes;     /* total bytes received         */
 113   unsigned long tx_bytes;     /* total bytes transmitted      */
 114   unsigned long rx_errors;    /* bad packets received         */
 115   unsigned long tx_errors;    /* packet transmit problems     */
 116   unsigned long rx_dropped;   /* no space in linux buffers    */
 117   unsigned long tx_dropped;   /* no space available in linux  */
 118   unsigned long rx_multicast; /* multicast packets received   */
 119   unsigned long rx_compressed;
 120   unsigned long tx_compressed;
 121   unsigned long collisions;
 122
 123   /* detailed rx_errors: */
 124   unsigned long rx_length_errors;
 125   unsigned long rx_over_errors;       /* receiver ring buff overflow  */
 126   unsigned long rx_crc_errors;        /* recved pkt with crc error    */
 127   unsigned long rx_frame_errors;      /* recv'd frame alignment error */
 128   unsigned long rx_fifo_errors;       /* recv'r fifo overrun          */
 129   unsigned long rx_missed_errors;     /* receiver missed packet     */
 130   /* detailed tx_errors */
 131   unsigned long tx_aborted_errors;
 132   unsigned long tx_carrier_errors;
 133   unsigned long tx_fifo_errors;
 134   unsigned long tx_heartbeat_errors;
 135   unsigned long tx_window_errors;
 136 };
 137 #endif /* HAVE_PROC_NET_DEV */
 138
 139 /* Here are "non-official" architectural constants. */
 140 #define TE_EXT_MASK             0x0FFFFFFF
 141 #define TE_EXT_ANORMAL          0x80000000
 142 #define LOSS_PRECISION          0.000003
 143 #define TE_KILO_BIT             1000
 144 #define TE_BYTE                 8
 145 #define DEFAULT_BANDWIDTH       10000
 146 #define MAX_CLASS_TYPE          8
 147 #define MAX_PKT_LOSS            50.331642
 148
 149 /*
 150  * Link Parameters Status:
 151  *  equal to 0: unset
 152  *  different from 0: set
 153  */
 154 #define LP_UNSET                0x0000
 155 #define LP_TE_METRIC            0x0001
 156 #define LP_MAX_BW               0x0002
 157 #define LP_MAX_RSV_BW           0x0004
 158 #define LP_UNRSV_BW             0x0008
 159 #define LP_ADM_GRP              0x0010
 160 #define LP_RMT_AS               0x0020
 161 #define LP_DELAY                0x0040
 162 #define LP_MM_DELAY             0x0080
 163 #define LP_DELAY_VAR            0x0100
 164 #define LP_PKT_LOSS             0x0200
 165 #define LP_RES_BW               0x0400
 166 #define LP_AVA_BW               0x0800
 167 #define LP_USE_BW               0x1000
 168
 169 #define IS_PARAM_UNSET(lp, st) !(lp->lp_status & st)
 170 #define IS_PARAM_SET(lp, st) (lp->lp_status & st)
 171 #define IS_LINK_PARAMS_SET(lp) (lp->lp_status != LP_UNSET)
 172
 173 #define SET_PARAM(lp, st) (lp->lp_status) |= (st)
 174 #define UNSET_PARAM(lp, st) (lp->lp_status) &= ~(st)
 175 #define RESET_LINK_PARAM(lp) (lp->lp_status = LP_UNSET)
 176
 177 /* Link Parameters for Traffic Engineering */
 178 struct if_link_params {
 179   u_int32_t lp_status;   /* Status of Link Parameters: */
 180   u_int32_t te_metric;   /* Traffic Engineering metric */
 181   float default_bw;
 182   float max_bw;          /* Maximum Bandwidth */
 183   float max_rsv_bw;      /* Maximum Reservable Bandwidth */
 184   float unrsv_bw[MAX_CLASS_TYPE];     /* Unreserved Bandwidth per Class Type (8) */
 185   u_int32_t admin_grp;   /* Administrative group */
 186   u_int32_t rmt_as;      /* Remote AS number */
 187   struct in_addr rmt_ip; /* Remote IP address */
 188   u_int32_t av_delay;    /* Link Average Delay */
 189   u_int32_t min_delay;   /* Link Min Delay */
 190   u_int32_t max_delay;   /* Link Max Delay */
 191   u_int32_t delay_var;   /* Link Delay Variation */
 192   float pkt_loss;        /* Link Packet Loss */
 193   float res_bw;          /* Residual Bandwidth */
 194   float ava_bw;          /* Available Bandwidth */
 195   float use_bw;          /* Utilized Bandwidth */
 196 };
 197
 198 #define INTERFACE_LINK_PARAMS_SIZE   sizeof(struct if_link_params)
 199 #define HAS_LINK_PARAMS(ifp)  ((ifp)->link_params != NULL)
 200
 201 /* Interface structure */
 202 struct interface
 203 {
 204   /* Interface name.  This should probably never be changed after the
 205      interface is created, because the configuration info for this interface
 206      is associated with this structure.  For that reason, the interface
 207      should also never be deleted (to avoid losing configuration info).
 208      To delete, just set ifindex to IFINDEX_INTERNAL to indicate that the
 209      interface does not exist in the kernel.
 210    */
 211   char name[INTERFACE_NAMSIZ + 1];
 212
 213   /* Interface index (should be IFINDEX_INTERNAL for non-kernel or
 214      deleted interfaces). */
 215   ifindex_t ifindex;
 216 #define IFINDEX_INTERNAL        0
 217 #define IFINDEX_DELETED         INT_MAX
 218
 219   /* Zebra internal interface status */
 220   u_char status;
 221 #define ZEBRA_INTERFACE_ACTIVE     (1 << 0)
 222 #define ZEBRA_INTERFACE_SUB        (1 << 1)
 223 #define ZEBRA_INTERFACE_LINKDETECTION (1 << 2)
 224 #define ZEBRA_INTERFACE_VRF_LOOPBACK (1 << 3)
 225
 226   /* Interface flags. */
 227   uint64_t flags;
 228
 229   /* Interface metric */
 230   uint32_t metric;
 231
 232   /* Interface Speed in Mb/s */
 233   uint32_t speed;
 234
 235   /* Interface MTU. */
 236   unsigned int mtu;    /* IPv4 MTU */
 237   unsigned int mtu6;   /* IPv6 MTU - probably, but not neccessarily same as mtu */
 238
 239   /* Link-layer information and hardware address */
 240   enum zebra_link_type ll_type;
 241   u_char hw_addr[INTERFACE_HWADDR_MAX];
 242   int hw_addr_len;
 243
 244   /* interface bandwidth, kbits */
 245   unsigned int bandwidth;
 246
 247   /* Link parameters for Traffic Engineering */
 248   struct if_link_params *link_params;
 249
 250   /* description of the interface. */
 251   char *desc;
 252
 253   /* Distribute list. */
 254   void *distribute_in;
 255   void *distribute_out;
 256
 257   /* Connected address list. */
 258   struct list *connected;
 259
 260   /* Neighbor connected address list. */
 261   struct list *nbr_connected;
 262
 263   /* Daemon specific interface data pointer. */
 264   void *info;
 265
 266   char ptm_enable;             /* Should we look at ptm_status ? */
 267   char ptm_status;
 268
 269   /* Statistics fileds. */
 270 #ifdef HAVE_PROC_NET_DEV
 271   struct if_stats stats;
 272 #endif /* HAVE_PROC_NET_DEV */
 273 #ifdef HAVE_NET_RT_IFLIST
 274   struct if_data stats;
 275 #endif /* HAVE_NET_RT_IFLIST */
 276
 277   struct route_node *node;
 278   vrf_id_t vrf_id;
 279
 280   QOBJ_FIELDS
 281 };
 282 DECLARE_QOBJ_TYPE(interface)
 283
 284 /* Connected address structure. */
 285 struct connected
 286 {
 287   /* Attached interface. */
 288   struct interface *ifp;
 289
 290   /* Flags for configuration. */
 291   u_char conf;
 292 #define ZEBRA_IFC_REAL         (1 << 0)
 293 #define ZEBRA_IFC_CONFIGURED   (1 << 1)
 294 #define ZEBRA_IFC_QUEUED       (1 << 2)
 295   /*
 296      The ZEBRA_IFC_REAL flag should be set if and only if this address
 297      exists in the kernel and is actually usable. (A case where it exists but
 298      is not yet usable would be IPv6 with DAD)
 299      The ZEBRA_IFC_CONFIGURED flag should be set if and only if this address
 300      was configured by the user from inside quagga.
 301      The ZEBRA_IFC_QUEUED flag should be set if and only if the address exists
 302      in the kernel. It may and should be set although the address might not be
 303      usable yet. (compare with ZEBRA_IFC_REAL)
 304    */
 305
 306   /* Flags for connected address. */
 307   u_char flags;
 308 #define ZEBRA_IFA_SECONDARY    (1 << 0)
 309 #define ZEBRA_IFA_PEER         (1 << 1)
 310 #define ZEBRA_IFA_UNNUMBERED   (1 << 2)
 311   /* N.B. the ZEBRA_IFA_PEER flag should be set if and only if
 312      a peer address has been configured.  If this flag is set,
 313      the destination field must contain the peer address.
 314      Otherwise, if this flag is not set, the destination address
 315      will either contain a broadcast address or be NULL.
 316    */
 317
 318   /* Address of connected network. */
 319   struct prefix *address;
 320
 321   /* Peer or Broadcast address, depending on whether ZEBRA_IFA_PEER is set.
 322      Note: destination may be NULL if ZEBRA_IFA_PEER is not set. */
 323   struct prefix *destination;
 324
 325   /* Label for Linux 2.2.X and upper. */
 326   char *label;
 327 };
 328
 329 /* Nbr Connected address structure. */
 330 struct nbr_connected
 331 {
 332   /* Attached interface. */
 333   struct interface *ifp;
 334
 335   /* Address of connected network. */
 336   struct prefix *address;
 337 };
 338
 339 /* Does the destination field contain a peer address? */
 340 #define CONNECTED_PEER(C) CHECK_FLAG((C)->flags, ZEBRA_IFA_PEER)
 341
 342 /* Prefix to insert into the RIB */
 343 #define CONNECTED_PREFIX(C) \
 344         (CONNECTED_PEER(C) ? (C)->destination : (C)->address)
 345
 346 /* Identifying address.  We guess that if there's a peer address, but the
 347    local address is in the same prefix, then the local address may be unique. */
 348 #define CONNECTED_ID(C) \
 349         ((CONNECTED_PEER(C) && !prefix_match((C)->destination, (C)->address)) ?\
 350          (C)->destination : (C)->address)
 351
 352 /* Interface hook sort. */
 353 #define IF_NEW_HOOK   0
 354 #define IF_DELETE_HOOK 1
 355
 356 /* There are some interface flags which are only supported by some
 357    operating system. */
 358
 359 #ifndef IFF_NOTRAILERS
 360 #define IFF_NOTRAILERS 0x0
 361 #endif /* IFF_NOTRAILERS */
 362 #ifndef IFF_OACTIVE
 363 #define IFF_OACTIVE 0x0
 364 #endif /* IFF_OACTIVE */
 365 #ifndef IFF_SIMPLEX
 366 #define IFF_SIMPLEX 0x0
 367 #endif /* IFF_SIMPLEX */
 368 #ifndef IFF_LINK0
 369 #define IFF_LINK0 0x0
 370 #endif /* IFF_LINK0 */
 371 #ifndef IFF_LINK1
 372 #define IFF_LINK1 0x0
 373 #endif /* IFF_LINK1 */
 374 #ifndef IFF_LINK2
 375 #define IFF_LINK2 0x0
 376 #endif /* IFF_LINK2 */
 377 #ifndef IFF_NOXMIT
 378 #define IFF_NOXMIT 0x0
 379 #endif /* IFF_NOXMIT */
 380 #ifndef IFF_NORTEXCH
 381 #define IFF_NORTEXCH 0x0
 382 #endif /* IFF_NORTEXCH */
 383 #ifndef IFF_IPV4
 384 #define IFF_IPV4 0x0
 385 #endif /* IFF_IPV4 */
 386 #ifndef IFF_IPV6
 387 #define IFF_IPV6 0x0
 388 #endif /* IFF_IPV6 */
 389 #ifndef IFF_VIRTUAL
 390 #define IFF_VIRTUAL 0x0
 391 #endif /* IFF_VIRTUAL */
 392
 393 /* Prototypes. */
 394 extern int if_cmp_name_func (char *, char *);
 395
 396 extern void if_update (struct interface *, const char *name, int namelen,
 397                        vrf_id_t vrf_id);
 398 extern struct interface *if_create (const char *name, int namelen,
 399                                     vrf_id_t vrf_id);
 400 extern struct interface *if_lookup_by_index (ifindex_t, vrf_id_t vrf_id);
 401 extern struct interface *if_lookup_exact_address (void *matchaddr, int family,
 402                                                   vrf_id_t vrf_id);
 403 extern struct connected *if_lookup_address (void *matchaddr, int family,
 404                                             vrf_id_t vrf_id);
 405 extern struct interface *if_lookup_prefix (struct prefix *prefix,
 406                                 vrf_id_t vrf_id);
 407
 408 /* These 3 functions are to be used when the ifname argument is terminated
 409    by a '\0' character: */
 410 extern struct interface *if_lookup_by_name_all_vrf (const char *ifname);
 411 extern struct interface *if_lookup_by_name (const char *ifname,
 412                                                 vrf_id_t vrf_id);
 413 extern struct interface *if_get_by_name (const char *ifname,
 414                                 vrf_id_t vrf_id);
 415
 416 /* For these 2 functions, the namelen argument should be the precise length
 417    of the ifname string (not counting any optional trailing '\0' character).
 418    In most cases, strnlen should be used to calculate the namelen value. */
 419 extern struct interface *if_lookup_by_name_len(const char *ifname,
 420                                                size_t namelen, vrf_id_t vrf_id);
 421 extern struct interface *if_get_by_name_len(const char *ifname,
 422                                 size_t namelen, vrf_id_t vrf_id, int vty);
 423
 424
 425 /* Delete the interface, but do not free the structure, and leave it in the
 426    interface list.  It is often advisable to leave the pseudo interface
 427    structure because there may be configuration information attached. */
 428 extern void if_delete_retain (struct interface *);
 429
 430 /* Delete and free the interface structure: calls if_delete_retain and then
 431    deletes it from the interface list and frees the structure. */
 432 extern void if_delete (struct interface *);
 433
 434 extern int if_is_up (struct interface *);
 435 extern int if_is_running (struct interface *);
 436 extern int if_is_operative (struct interface *);
 437 extern int if_is_no_ptm_operative (struct interface *);
 438 extern int if_is_loopback (struct interface *);
 439 extern int if_is_broadcast (struct interface *);
 440 extern int if_is_pointopoint (struct interface *);
 441 extern int if_is_multicast (struct interface *);
 442 extern void if_add_hook (int, int (*)(struct interface *));
 443 extern void if_init (struct list **);
 444 extern void if_cmd_init (void);
 445 extern void if_terminate (struct list **);
 446 extern void if_dump_all (void);
 447 extern const char *if_flag_dump(unsigned long);
 448 extern const char *if_link_type_str (enum zebra_link_type);
 449
 450 /* Please use ifindex2ifname instead of if_indextoname where possible;
 451    ifindex2ifname uses internal interface info, whereas if_indextoname must
 452    make a system call. */
 453 extern const char *ifindex2ifname (ifindex_t, vrf_id_t vrf_id);
 454
 455 /* Please use ifname2ifindex instead of if_nametoindex where possible;
 456    ifname2ifindex uses internal interface info, whereas if_nametoindex must
 457    make a system call. */
 458 extern ifindex_t ifname2ifindex(const char *ifname, vrf_id_t vrf_id);
 459
 460 /* Connected address functions. */
 461 extern struct connected *connected_new (void);
 462 extern void connected_free (struct connected *);
 463 extern void connected_add (struct interface *, struct connected *);
 464 extern struct connected  *connected_add_by_prefix (struct interface *,
 465                                             struct prefix *,
 466                                             struct prefix *);
 467 extern struct connected  *connected_delete_by_prefix (struct interface *,
 468                                                struct prefix *);
 469 extern struct connected  *connected_lookup_prefix (struct interface *,
 470                                                    struct prefix *);
 471 extern struct connected  *connected_lookup_prefix_exact (struct interface *,
 472                                                    struct prefix *);
 473 extern struct nbr_connected *nbr_connected_new (void);
 474 extern void nbr_connected_free (struct nbr_connected *);
 475 struct nbr_connected *nbr_connected_check (struct interface *, struct prefix *);
 476
 477 /* link parameters */
 478 struct if_link_params *if_link_params_get (struct interface *);
 479 void if_link_params_free (struct interface *);
 480
 481 #endif /* _ZEBRA_IF_H */