The Design and Implementation of the FreeBSD Operating System, Second Edition
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FreeBSD/Linux Kernel Cross Reference
sys/net/if.h

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    1 /*-
    2  * Copyright (c) 1982, 1986, 1989, 1993
    3  *      The Regents of the University of California.  All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  * 4. Neither the name of the University nor the names of its contributors
   14  *    may be used to endorse or promote products derived from this software
   15  *    without specific prior written permission.
   16  *
   17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   27  * SUCH DAMAGE.
   28  *
   29  *      @(#)if.h        8.1 (Berkeley) 6/10/93
   30  * $FreeBSD: releng/9.0/sys/net/if.h 223735 2011-07-03 12:22:02Z bz $
   31  */
   32 
   33 #ifndef _NET_IF_H_
   34 #define _NET_IF_H_
   35 
   36 #include <sys/cdefs.h>
   37 
   38 #ifdef _KERNEL
   39 #include <sys/queue.h>
   40 #endif
   41 
   42 #if __BSD_VISIBLE
   43 /*
   44  * <net/if.h> does not depend on <sys/time.h> on most other systems.  This
   45  * helps userland compatibility.  (struct timeval ifi_lastchange)
   46  */
   47 #ifndef _KERNEL
   48 #include <sys/time.h>
   49 #endif
   50 
   51 struct ifnet;
   52 #endif
   53 
   54 /*
   55  * Length of interface external name, including terminating '\0'.
   56  * Note: this is the same size as a generic device's external name.
   57  */
   58 #define         IF_NAMESIZE     16
   59 #if __BSD_VISIBLE
   60 #define         IFNAMSIZ        IF_NAMESIZE
   61 #define         IF_MAXUNIT      0x7fff  /* historical value */
   62 #endif
   63 #if __BSD_VISIBLE
   64 
   65 /*
   66  * Structure used to query names of interface cloners.
   67  */
   68 
   69 struct if_clonereq {
   70         int     ifcr_total;             /* total cloners (out) */
   71         int     ifcr_count;             /* room for this many in user buffer */
   72         char    *ifcr_buffer;           /* buffer for cloner names */
   73 };
   74 
   75 /*
   76  * Structure describing information about an interface
   77  * which may be of interest to management entities.
   78  */
   79 struct if_data {
   80         /* generic interface information */
   81         u_char  ifi_type;               /* ethernet, tokenring, etc */
   82         u_char  ifi_physical;           /* e.g., AUI, Thinnet, 10base-T, etc */
   83         u_char  ifi_addrlen;            /* media address length */
   84         u_char  ifi_hdrlen;             /* media header length */
   85         u_char  ifi_link_state;         /* current link state */
   86         u_char  ifi_spare_char1;        /* spare byte */
   87         u_char  ifi_spare_char2;        /* spare byte */
   88         u_char  ifi_datalen;            /* length of this data struct */
   89         u_long  ifi_mtu;                /* maximum transmission unit */
   90         u_long  ifi_metric;             /* routing metric (external only) */
   91         u_long  ifi_baudrate;           /* linespeed */
   92         /* volatile statistics */
   93         u_long  ifi_ipackets;           /* packets received on interface */
   94         u_long  ifi_ierrors;            /* input errors on interface */
   95         u_long  ifi_opackets;           /* packets sent on interface */
   96         u_long  ifi_oerrors;            /* output errors on interface */
   97         u_long  ifi_collisions;         /* collisions on csma interfaces */
   98         u_long  ifi_ibytes;             /* total number of octets received */
   99         u_long  ifi_obytes;             /* total number of octets sent */
  100         u_long  ifi_imcasts;            /* packets received via multicast */
  101         u_long  ifi_omcasts;            /* packets sent via multicast */
  102         u_long  ifi_iqdrops;            /* dropped on input, this interface */
  103         u_long  ifi_noproto;            /* destined for unsupported protocol */
  104         u_long  ifi_hwassist;           /* HW offload capabilities, see IFCAP */
  105         time_t  ifi_epoch;              /* uptime at attach or stat reset */
  106         struct  timeval ifi_lastchange; /* time of last administrative change */
  107 };
  108 
  109 /*-
  110  * Interface flags are of two types: network stack owned flags, and driver
  111  * owned flags.  Historically, these values were stored in the same ifnet
  112  * flags field, but with the advent of fine-grained locking, they have been
  113  * broken out such that the network stack is responsible for synchronizing
  114  * the stack-owned fields, and the device driver the device-owned fields.
  115  * Both halves can perform lockless reads of the other half's field, subject
  116  * to accepting the involved races.
  117  *
  118  * Both sets of flags come from the same number space, and should not be
  119  * permitted to conflict, as they are exposed to user space via a single
  120  * field.
  121  *
  122  * The following symbols identify read and write requirements for fields:
  123  *
  124  * (i) if_flags field set by device driver before attach, read-only there
  125  *     after.
  126  * (n) if_flags field written only by the network stack, read by either the
  127  *     stack or driver.
  128  * (d) if_drv_flags field written only by the device driver, read by either
  129  *     the stack or driver.
  130  */
  131 #define IFF_UP          0x1             /* (n) interface is up */
  132 #define IFF_BROADCAST   0x2             /* (i) broadcast address valid */
  133 #define IFF_DEBUG       0x4             /* (n) turn on debugging */
  134 #define IFF_LOOPBACK    0x8             /* (i) is a loopback net */
  135 #define IFF_POINTOPOINT 0x10            /* (i) is a point-to-point link */
  136 #define IFF_SMART       0x20            /* (i) interface manages own routes */
  137 #define IFF_DRV_RUNNING 0x40            /* (d) resources allocated */
  138 #define IFF_NOARP       0x80            /* (n) no address resolution protocol */
  139 #define IFF_PROMISC     0x100           /* (n) receive all packets */
  140 #define IFF_ALLMULTI    0x200           /* (n) receive all multicast packets */
  141 #define IFF_DRV_OACTIVE 0x400           /* (d) tx hardware queue is full */
  142 #define IFF_SIMPLEX     0x800           /* (i) can't hear own transmissions */
  143 #define IFF_LINK0       0x1000          /* per link layer defined bit */
  144 #define IFF_LINK1       0x2000          /* per link layer defined bit */
  145 #define IFF_LINK2       0x4000          /* per link layer defined bit */
  146 #define IFF_ALTPHYS     IFF_LINK2       /* use alternate physical connection */
  147 #define IFF_MULTICAST   0x8000          /* (i) supports multicast */
  148 #define IFF_CANTCONFIG  0x10000         /* (i) unconfigurable using ioctl(2) */
  149 #define IFF_PPROMISC    0x20000         /* (n) user-requested promisc mode */
  150 #define IFF_MONITOR     0x40000         /* (n) user-requested monitor mode */
  151 #define IFF_STATICARP   0x80000         /* (n) static ARP */
  152 #define IFF_DYING       0x200000        /* (n) interface is winding down */
  153 #define IFF_RENAMING    0x400000        /* (n) interface is being renamed */
  154 
  155 /*
  156  * Old names for driver flags so that user space tools can continue to use
  157  * the old (portable) names.
  158  */
  159 #ifndef _KERNEL
  160 #define IFF_RUNNING     IFF_DRV_RUNNING
  161 #define IFF_OACTIVE     IFF_DRV_OACTIVE
  162 #endif
  163 
  164 /* flags set internally only: */
  165 #define IFF_CANTCHANGE \
  166         (IFF_BROADCAST|IFF_POINTOPOINT|IFF_DRV_RUNNING|IFF_DRV_OACTIVE|\
  167             IFF_SIMPLEX|IFF_MULTICAST|IFF_ALLMULTI|IFF_SMART|IFF_PROMISC|\
  168             IFF_DYING|IFF_CANTCONFIG)
  169 
  170 /*
  171  * Values for if_link_state.
  172  */
  173 #define LINK_STATE_UNKNOWN      0       /* link invalid/unknown */
  174 #define LINK_STATE_DOWN         1       /* link is down */
  175 #define LINK_STATE_UP           2       /* link is up */
  176 
  177 /*
  178  * Some convenience macros used for setting ifi_baudrate.
  179  * XXX 1000 vs. 1024? --thorpej@netbsd.org
  180  */
  181 #define IF_Kbps(x)      ((x) * 1000)            /* kilobits/sec. */
  182 #define IF_Mbps(x)      (IF_Kbps((x) * 1000))   /* megabits/sec. */
  183 #define IF_Gbps(x)      (IF_Mbps((x) * 1000))   /* gigabits/sec. */
  184 
  185 /*
  186  * Capabilities that interfaces can advertise.
  187  *
  188  * struct ifnet.if_capabilities
  189  *   contains the optional features & capabilities a particular interface
  190  *   supports (not only the driver but also the detected hw revision).
  191  *   Capabilities are defined by IFCAP_* below.
  192  * struct ifnet.if_capenable
  193  *   contains the enabled (either by default or through ifconfig) optional
  194  *   features & capabilities on this interface.
  195  *   Capabilities are defined by IFCAP_* below.
  196  * struct if_data.ifi_hwassist in mbuf CSUM_ flag form, controlled by above
  197  *   contains the enabled optional feature & capabilites that can be used
  198  *   individually per packet and are specified in the mbuf pkthdr.csum_flags
  199  *   field.  IFCAP_* and CSUM_* do not match one to one and CSUM_* may be
  200  *   more detailed or differenciated than IFCAP_*.
  201  *   Hwassist features are defined CSUM_* in sys/mbuf.h
  202  *
  203  * Capabilities that cannot be arbitrarily changed with ifconfig/ioctl
  204  * are listed in IFCAP_CANTCHANGE, similar to IFF_CANTCHANGE.
  205  * This is not strictly necessary because the common code never
  206  * changes capabilities, and it is left to the individual driver
  207  * to do the right thing. However, having the filter here
  208  * avoids replication of the same code in all individual drivers.
  209  */
  210 #define IFCAP_RXCSUM            0x00001  /* can offload checksum on RX */
  211 #define IFCAP_TXCSUM            0x00002  /* can offload checksum on TX */
  212 #define IFCAP_NETCONS           0x00004  /* can be a network console */
  213 #define IFCAP_VLAN_MTU          0x00008 /* VLAN-compatible MTU */
  214 #define IFCAP_VLAN_HWTAGGING    0x00010 /* hardware VLAN tag support */
  215 #define IFCAP_JUMBO_MTU         0x00020 /* 9000 byte MTU supported */
  216 #define IFCAP_POLLING           0x00040 /* driver supports polling */
  217 #define IFCAP_VLAN_HWCSUM       0x00080 /* can do IFCAP_HWCSUM on VLANs */
  218 #define IFCAP_TSO4              0x00100 /* can do TCP Segmentation Offload */
  219 #define IFCAP_TSO6              0x00200 /* can do TCP6 Segmentation Offload */
  220 #define IFCAP_LRO               0x00400 /* can do Large Receive Offload */
  221 #define IFCAP_WOL_UCAST         0x00800 /* wake on any unicast frame */
  222 #define IFCAP_WOL_MCAST         0x01000 /* wake on any multicast frame */
  223 #define IFCAP_WOL_MAGIC         0x02000 /* wake on any Magic Packet */
  224 #define IFCAP_TOE4              0x04000 /* interface can offload TCP */
  225 #define IFCAP_TOE6              0x08000 /* interface can offload TCP6 */
  226 #define IFCAP_VLAN_HWFILTER     0x10000 /* interface hw can filter vlan tag */
  227 #define IFCAP_POLLING_NOCOUNT   0x20000 /* polling ticks cannot be fragmented */
  228 #define IFCAP_VLAN_HWTSO        0x40000 /* can do IFCAP_TSO on VLANs */
  229 #define IFCAP_LINKSTATE         0x80000 /* the runtime link state is dynamic */
  230 #define IFCAP_NETMAP            0x100000 /* netmap mode supported/enabled */
  231 
  232 #define IFCAP_HWCSUM    (IFCAP_RXCSUM | IFCAP_TXCSUM)
  233 #define IFCAP_TSO       (IFCAP_TSO4 | IFCAP_TSO6)
  234 #define IFCAP_WOL       (IFCAP_WOL_UCAST | IFCAP_WOL_MCAST | IFCAP_WOL_MAGIC)
  235 #define IFCAP_TOE       (IFCAP_TOE4 | IFCAP_TOE6)
  236 
  237 #define IFCAP_CANTCHANGE        (IFCAP_NETMAP)
  238 
  239 #define IFQ_MAXLEN      50
  240 #define IFNET_SLOWHZ    1               /* granularity is 1 second */
  241 
  242 /*
  243  * Message format for use in obtaining information about interfaces
  244  * from getkerninfo and the routing socket
  245  */
  246 struct if_msghdr {
  247         u_short ifm_msglen;     /* to skip over non-understood messages */
  248         u_char  ifm_version;    /* future binary compatibility */
  249         u_char  ifm_type;       /* message type */
  250         int     ifm_addrs;      /* like rtm_addrs */
  251         int     ifm_flags;      /* value of if_flags */
  252         u_short ifm_index;      /* index for associated ifp */
  253         struct  if_data ifm_data;/* statistics and other data about if */
  254 };
  255 
  256 /*
  257  * Message format for use in obtaining information about interface addresses
  258  * from getkerninfo and the routing socket
  259  */
  260 struct ifa_msghdr {
  261         u_short ifam_msglen;    /* to skip over non-understood messages */
  262         u_char  ifam_version;   /* future binary compatibility */
  263         u_char  ifam_type;      /* message type */
  264         int     ifam_addrs;     /* like rtm_addrs */
  265         int     ifam_flags;     /* value of ifa_flags */
  266         u_short ifam_index;     /* index for associated ifp */
  267         int     ifam_metric;    /* value of ifa_metric */
  268 };
  269 
  270 /*
  271  * Message format for use in obtaining information about multicast addresses
  272  * from the routing socket
  273  */
  274 struct ifma_msghdr {
  275         u_short ifmam_msglen;   /* to skip over non-understood messages */
  276         u_char  ifmam_version;  /* future binary compatibility */
  277         u_char  ifmam_type;     /* message type */
  278         int     ifmam_addrs;    /* like rtm_addrs */
  279         int     ifmam_flags;    /* value of ifa_flags */
  280         u_short ifmam_index;    /* index for associated ifp */
  281 };
  282 
  283 /*
  284  * Message format announcing the arrival or departure of a network interface.
  285  */
  286 struct if_announcemsghdr {
  287         u_short ifan_msglen;    /* to skip over non-understood messages */
  288         u_char  ifan_version;   /* future binary compatibility */
  289         u_char  ifan_type;      /* message type */
  290         u_short ifan_index;     /* index for associated ifp */
  291         char    ifan_name[IFNAMSIZ]; /* if name, e.g. "en0" */
  292         u_short ifan_what;      /* what type of announcement */
  293 };
  294 
  295 #define IFAN_ARRIVAL    0       /* interface arrival */
  296 #define IFAN_DEPARTURE  1       /* interface departure */
  297 
  298 /*
  299  * Buffer with length to be used in SIOCGIFDESCR/SIOCSIFDESCR requests
  300  */
  301 struct ifreq_buffer {
  302         size_t  length;
  303         void    *buffer;
  304 };
  305 
  306 /*
  307  * Interface request structure used for socket
  308  * ioctl's.  All interface ioctl's must have parameter
  309  * definitions which begin with ifr_name.  The
  310  * remainder may be interface specific.
  311  */
  312 struct  ifreq {
  313         char    ifr_name[IFNAMSIZ];             /* if name, e.g. "en0" */
  314         union {
  315                 struct  sockaddr ifru_addr;
  316                 struct  sockaddr ifru_dstaddr;
  317                 struct  sockaddr ifru_broadaddr;
  318                 struct  ifreq_buffer ifru_buffer;
  319                 short   ifru_flags[2];
  320                 short   ifru_index;
  321                 int     ifru_jid;
  322                 int     ifru_metric;
  323                 int     ifru_mtu;
  324                 int     ifru_phys;
  325                 int     ifru_media;
  326                 caddr_t ifru_data;
  327                 int     ifru_cap[2];
  328                 u_int   ifru_fib;
  329         } ifr_ifru;
  330 #define ifr_addr        ifr_ifru.ifru_addr      /* address */
  331 #define ifr_dstaddr     ifr_ifru.ifru_dstaddr   /* other end of p-to-p link */
  332 #define ifr_broadaddr   ifr_ifru.ifru_broadaddr /* broadcast address */
  333 #define ifr_buffer      ifr_ifru.ifru_buffer    /* user supplied buffer with its length */
  334 #define ifr_flags       ifr_ifru.ifru_flags[0]  /* flags (low 16 bits) */
  335 #define ifr_flagshigh   ifr_ifru.ifru_flags[1]  /* flags (high 16 bits) */
  336 #define ifr_jid         ifr_ifru.ifru_jid       /* jail/vnet */
  337 #define ifr_metric      ifr_ifru.ifru_metric    /* metric */
  338 #define ifr_mtu         ifr_ifru.ifru_mtu       /* mtu */
  339 #define ifr_phys        ifr_ifru.ifru_phys      /* physical wire */
  340 #define ifr_media       ifr_ifru.ifru_media     /* physical media */
  341 #define ifr_data        ifr_ifru.ifru_data      /* for use by interface */
  342 #define ifr_reqcap      ifr_ifru.ifru_cap[0]    /* requested capabilities */
  343 #define ifr_curcap      ifr_ifru.ifru_cap[1]    /* current capabilities */
  344 #define ifr_index       ifr_ifru.ifru_index     /* interface index */
  345 #define ifr_fib         ifr_ifru.ifru_fib       /* interface fib */
  346 };
  347 
  348 #define _SIZEOF_ADDR_IFREQ(ifr) \
  349         ((ifr).ifr_addr.sa_len > sizeof(struct sockaddr) ? \
  350          (sizeof(struct ifreq) - sizeof(struct sockaddr) + \
  351           (ifr).ifr_addr.sa_len) : sizeof(struct ifreq))
  352 
  353 struct ifaliasreq {
  354         char    ifra_name[IFNAMSIZ];            /* if name, e.g. "en0" */
  355         struct  sockaddr ifra_addr;
  356         struct  sockaddr ifra_broadaddr;
  357         struct  sockaddr ifra_mask;
  358 };
  359 
  360 struct ifmediareq {
  361         char    ifm_name[IFNAMSIZ];     /* if name, e.g. "en0" */
  362         int     ifm_current;            /* current media options */
  363         int     ifm_mask;               /* don't care mask */
  364         int     ifm_status;             /* media status */
  365         int     ifm_active;             /* active options */
  366         int     ifm_count;              /* # entries in ifm_ulist array */
  367         int     *ifm_ulist;             /* media words */
  368 };
  369 
  370 struct  ifdrv {
  371         char            ifd_name[IFNAMSIZ];     /* if name, e.g. "en0" */
  372         unsigned long   ifd_cmd;
  373         size_t          ifd_len;
  374         void            *ifd_data;
  375 };
  376 
  377 /* 
  378  * Structure used to retrieve aux status data from interfaces.
  379  * Kernel suppliers to this interface should respect the formatting
  380  * needed by ifconfig(8): each line starts with a TAB and ends with
  381  * a newline.  The canonical example to copy and paste is in if_tun.c.
  382  */
  383 
  384 #define IFSTATMAX       800             /* 10 lines of text */
  385 struct ifstat {
  386         char    ifs_name[IFNAMSIZ];     /* if name, e.g. "en0" */
  387         char    ascii[IFSTATMAX + 1];
  388 };
  389 
  390 /*
  391  * Structure used in SIOCGIFCONF request.
  392  * Used to retrieve interface configuration
  393  * for machine (useful for programs which
  394  * must know all networks accessible).
  395  */
  396 struct  ifconf {
  397         int     ifc_len;                /* size of associated buffer */
  398         union {
  399                 caddr_t ifcu_buf;
  400                 struct  ifreq *ifcu_req;
  401         } ifc_ifcu;
  402 #define ifc_buf ifc_ifcu.ifcu_buf       /* buffer address */
  403 #define ifc_req ifc_ifcu.ifcu_req       /* array of structures returned */
  404 };
  405 
  406 /*
  407  * interface groups
  408  */
  409 
  410 #define IFG_ALL         "all"           /* group contains all interfaces */
  411 /* XXX: will we implement this? */
  412 #define IFG_EGRESS      "egress"        /* if(s) default route(s) point to */
  413 
  414 struct ifg_req {
  415         union {
  416                 char                     ifgrqu_group[IFNAMSIZ];
  417                 char                     ifgrqu_member[IFNAMSIZ];
  418         } ifgrq_ifgrqu;
  419 #define ifgrq_group     ifgrq_ifgrqu.ifgrqu_group
  420 #define ifgrq_member    ifgrq_ifgrqu.ifgrqu_member
  421 };
  422 
  423 /*
  424  * Used to lookup groups for an interface
  425  */
  426 struct ifgroupreq {
  427         char    ifgr_name[IFNAMSIZ];
  428         u_int   ifgr_len;
  429         union {
  430                 char    ifgru_group[IFNAMSIZ];
  431                 struct  ifg_req *ifgru_groups;
  432         } ifgr_ifgru;
  433 #define ifgr_group      ifgr_ifgru.ifgru_group
  434 #define ifgr_groups     ifgr_ifgru.ifgru_groups
  435 };
  436 
  437 /*
  438  * Structure for SIOC[AGD]LIFADDR
  439  */
  440 struct if_laddrreq {
  441         char    iflr_name[IFNAMSIZ];
  442         u_int   flags;
  443 #define IFLR_PREFIX     0x8000  /* in: prefix given  out: kernel fills id */
  444         u_int   prefixlen;         /* in/out */
  445         struct  sockaddr_storage addr;   /* in/out */
  446         struct  sockaddr_storage dstaddr; /* out */
  447 };
  448 
  449 #endif /* __BSD_VISIBLE */
  450 
  451 #ifdef _KERNEL
  452 #ifdef MALLOC_DECLARE
  453 MALLOC_DECLARE(M_IFADDR);
  454 MALLOC_DECLARE(M_IFMADDR);
  455 #endif
  456 #endif
  457 
  458 #ifndef _KERNEL
  459 struct if_nameindex {
  460         unsigned int    if_index;       /* 1, 2, ... */
  461         char            *if_name;       /* null terminated name: "le0", ... */
  462 };
  463 
  464 __BEGIN_DECLS
  465 void                     if_freenameindex(struct if_nameindex *);
  466 char                    *if_indextoname(unsigned int, char *);
  467 struct if_nameindex     *if_nameindex(void);
  468 unsigned int             if_nametoindex(const char *);
  469 __END_DECLS
  470 #endif
  471 
  472 #ifdef _KERNEL
  473 /* XXX - this should go away soon. */
  474 #include <net/if_var.h>
  475 #endif
  476 
  477 #endif /* !_NET_IF_H_ */

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