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/* $NetBSD: if.h,v 1.161 2014/03/12 12:59:57 pooka Exp $ */

/*-
* Copyright (c) 1999, 2000, 2001 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by William Studenmund and Jason R. Thorpe.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/

/*
* Copyright (c) 1982, 1986, 1989, 1993
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* @(#)if.h 8.3 (Berkeley) 2/9/95
*/

#ifndef _NET_IF_H_
#define _NET_IF_H_

#if !defined(_KERNEL) && !defined(_STANDALONE)
#include <stdbool.h>
#endif

#include <sys/featuretest.h>

/*
* Length of interface external name, including terminating '\0'.
* Note: this is the same size as a generic device's external name.
*/
#define IF_NAMESIZE 16

#if defined(_NETBSD_SOURCE)

#include <sys/socket.h>
#include <sys/queue.h>
#include <net/dlt.h>
#include <net/pfil.h>

/*
* Always include ALTQ glue here -- we use the ALTQ interface queue
* structure even when ALTQ is not configured into the kernel so that
* the size of struct ifnet does not changed based on the option. The
* ALTQ queue structure is API-compatible with the legacy ifqueue.
*/
#include <altq/if_altq.h>

/*
* Structures defining a network interface, providing a packet
* transport mechanism (ala level 0 of the PUP protocols).
*
* Each interface accepts output datagrams of a specified maximum
* length, and provides higher level routines with input datagrams
* received from its medium.
*
* Output occurs when the routine if_output is called, with four parameters:
* (*ifp->if_output)(ifp, m, dst, rt)
* Here m is the mbuf chain to be sent and dst is the destination address.
* The output routine encapsulates the supplied datagram if necessary,
* and then transmits it on its medium.
*
* On input, each interface unwraps the data received by it, and either
* places it on the input queue of a internetwork datagram routine
* and posts the associated software interrupt, or passes the datagram to a raw
* packet input routine.
*
* Routines exist for locating interfaces by their addresses
* or for locating a interface on a certain network, as well as more general
* routing and gateway routines maintaining information used to locate
* interfaces. These routines live in the files if.c and route.c
*/
#include <sys/time.h>

#if defined(_KERNEL_OPT)
#include "opt_compat_netbsd.h"
#endif

struct mbuf;
struct proc;
struct rtentry;
struct socket;
struct ether_header;
struct ifaddr;
struct ifnet;
struct rt_addrinfo;

#define IFNAMSIZ IF_NAMESIZE

/*
* Structure describing a `cloning' interface.
*/
struct if_clone {
LIST_ENTRY(if_clone) ifc_list; /* on list of cloners */
const char *ifc_name; /* name of device, e.g. `gif' */
size_t ifc_namelen; /* length of name */

int (*ifc_create)(struct if_clone *, int);
int (*ifc_destroy)(struct ifnet *);
};

#define IF_CLONE_INITIALIZER(name, create, destroy) \
{ { NULL, NULL }, name, sizeof(name) - 1, create, destroy }

/*
* Structure used to query names of interface cloners.
*/
struct if_clonereq {
int ifcr_total; /* total cloners (out) */
int ifcr_count; /* room for this many in user buffer */
char *ifcr_buffer; /* buffer for cloner names */
};

/*
* Structure defining statistics and other data kept regarding a network
* interface.
*/
struct if_data {
/* generic interface information */
u_char ifi_type; /* ethernet, tokenring, etc. */
u_char ifi_addrlen; /* media address length */
u_char ifi_hdrlen; /* media header length */
int ifi_link_state; /* current link state */
uint64_t ifi_mtu; /* maximum transmission unit */
uint64_t ifi_metric; /* routing metric (external only) */
uint64_t ifi_baudrate; /* linespeed */
/* volatile statistics */
uint64_t ifi_ipackets; /* packets received on interface */
uint64_t ifi_ierrors; /* input errors on interface */
uint64_t ifi_opackets; /* packets sent on interface */
uint64_t ifi_oerrors; /* output errors on interface */
uint64_t ifi_collisions; /* collisions on csma interfaces */
uint64_t ifi_ibytes; /* total number of octets received */
uint64_t ifi_obytes; /* total number of octets sent */
uint64_t ifi_imcasts; /* packets received via multicast */
uint64_t ifi_omcasts; /* packets sent via multicast */
uint64_t ifi_iqdrops; /* dropped on input, this interface */
uint64_t ifi_noproto; /* destined for unsupported protocol */
struct timespec ifi_lastchange;/* last operational state change */
};

/*
* Values for if_link_state.
*/
#define LINK_STATE_UNKNOWN 0 /* link invalid/unknown */
#define LINK_STATE_DOWN 1 /* link is down */
#define LINK_STATE_UP 2 /* link is up */

/*
* Structure defining a queue for a network interface.
*/
struct ifqueue {
struct mbuf *ifq_head;
struct mbuf *ifq_tail;
int ifq_len;
int ifq_maxlen;
int ifq_drops;
};

struct ifnet_lock;

#ifdef _KERNEL
#include <sys/mutex.h>
#include <sys/condvar.h>
#include <sys/percpu.h>

struct ifnet_lock {
kmutex_t il_lock; /* Protects the critical section. */
uint64_t il_nexit; /* Counts threads across all CPUs who
* have exited the critical section.
* Access to il_nexit is synchronized
* by il_lock.
*/
percpu_t *il_nenter; /* Counts threads on each CPU who have
* entered or who wait to enter the
* critical section protected by il_lock.
* Synchronization is not required.
*/
kcondvar_t il_emptied; /* The ifnet_lock user must arrange for
* the last threads in the critical
* section to signal this condition variable
* before they leave.
*/
};
#endif /* _KERNEL */

/*
* Structure defining a queue for a network interface.
*
* (Would like to call this struct ``if'', but C isn't PL/1.)
*/
TAILQ_HEAD(ifnet_head, ifnet); /* the actual queue head */

typedef struct ifnet {
void *if_softc; /* lower-level data for this if */
TAILQ_ENTRY(ifnet) if_list; /* all struct ifnets are chained */
TAILQ_HEAD(, ifaddr) if_addrlist; /* linked list of addresses per if */
char if_xname[IFNAMSIZ]; /* external name (name + unit) */
int if_pcount; /* number of promiscuous listeners */
struct bpf_if *if_bpf; /* packet filter structure */
u_short if_index; /* numeric abbreviation for this if */
short if_timer; /* time 'til if_watchdog called */
short if_flags; /* up/down, broadcast, etc. */
short if__pad1; /* be nice to m68k ports */
struct if_data if_data; /* statistics and other data about if */
/*
* Procedure handles. If you add more of these, don't forget the
* corresponding NULL stub in if.c.
*/
int (*if_output) /* output routine (enqueue) */
(struct ifnet *, struct mbuf *, const struct sockaddr *,
struct rtentry *);
void (*if_input) /* input routine (from h/w driver) */
(struct ifnet *, struct mbuf *);
void (*if_start) /* initiate output routine */
(struct ifnet *);
int (*if_ioctl) /* ioctl routine */
(struct ifnet *, u_long, void *);
int (*if_init) /* init routine */
(struct ifnet *);
void (*if_stop) /* stop routine */
(struct ifnet *, int);
void (*if_watchdog) /* timer routine */
(struct ifnet *);
void (*if_drain) /* routine to release resources */
(struct ifnet *);
struct ifaltq if_snd; /* output queue (includes altq) */
struct ifaddr *if_dl; /* identity of this interface. */
const struct sockaddr_dl *if_sadl; /* pointer to sockaddr_dl
* of if_dl
*/
/* if_hwdl: h/w identity
*
* May be NULL. If not NULL, it is the address assigned
* to the interface by the manufacturer, so it very likely
* to be unique. It MUST NOT be deleted. It is highly
* suitable for deriving the EUI64 for the interface.
*/
struct ifaddr *if_hwdl;
const uint8_t *if_broadcastaddr;/* linklevel broadcast bytestring */
void *if_bridge; /* bridge glue */
int if_dlt; /* data link type (<net/dlt.h>) */
pfil_head_t * if_pfil; /* filtering point */
uint64_t if_capabilities; /* interface capabilities */
uint64_t if_capenable; /* capabilities enabled */
union {
void * carp_s; /* carp structure (used by !carp ifs) */
struct ifnet *carp_d;/* ptr to carpdev (used by carp ifs) */
} if_carp_ptr;
#define if_carp if_carp_ptr.carp_s
#define if_carpdev if_carp_ptr.carp_d
/*
* These are pre-computed based on an interfaces enabled
* capabilities, for speed elsewhere.
*/
int if_csum_flags_tx; /* M_CSUM_* flags for Tx */
int if_csum_flags_rx; /* M_CSUM_* flags for Rx */

void *if_afdata[AF_MAX];
struct mowner *if_mowner; /* who owns mbufs for this interface */

void *if_agrprivate; /* used only when #if NAGR > 0 */

/*
* pf specific data, used only when #if NPF > 0.
*/
void *if_pf_kif; /* pf interface abstraction */
void *if_pf_groups; /* pf interface groups */
/*
* During an ifnet's lifetime, it has only one if_index, but
* and if_index is not sufficient to identify an ifnet
* because during the lifetime of the system, many ifnets may occupy a
* given if_index. Let us tell different ifnets at the same
* if_index apart by their if_index_gen, a unique number that each ifnet
* is assigned when it if_attach()s. Now, the kernel can use the
* pair (if_index, if_index_gen) as a weak reference to an ifnet.
*/
uint64_t if_index_gen; /* generation number for the ifnet
* at if_index: if two ifnets' index
* and generation number are both the
* same, they are the same ifnet.
*/
struct sysctllog *if_sysctl_log;
int (*if_initaddr)(struct ifnet *, struct ifaddr *, bool);
int (*if_mcastop)(struct ifnet *, const unsigned long,
const struct sockaddr *);
int (*if_setflags)(struct ifnet *, const short);
struct ifnet_lock *if_ioctl_lock;
} ifnet_t;
#define if_mtu if_data.ifi_mtu
#define if_type if_data.ifi_type
#define if_addrlen if_data.ifi_addrlen
#define if_hdrlen if_data.ifi_hdrlen
#define if_metric if_data.ifi_metric
#define if_link_state if_data.ifi_link_state
#define if_baudrate if_data.ifi_baudrate
#define if_ipackets if_data.ifi_ipackets
#define if_ierrors if_data.ifi_ierrors
#define if_opackets if_data.ifi_opackets
#define if_oerrors if_data.ifi_oerrors
#define if_collisions if_data.ifi_collisions
#define if_ibytes if_data.ifi_ibytes
#define if_obytes if_data.ifi_obytes
#define if_imcasts if_data.ifi_imcasts
#define if_omcasts if_data.ifi_omcasts
#define if_iqdrops if_data.ifi_iqdrops
#define if_noproto if_data.ifi_noproto
#define if_lastchange if_data.ifi_lastchange

#define IFF_UP 0x0001 /* interface is up */
#define IFF_BROADCAST 0x0002 /* broadcast address valid */
#define IFF_DEBUG 0x0004 /* turn on debugging */
#define IFF_LOOPBACK 0x0008 /* is a loopback net */
#define IFF_POINTOPOINT 0x0010 /* interface is point-to-point link */
#define IFF_NOTRAILERS 0x0020 /* avoid use of trailers */
#define IFF_RUNNING 0x0040 /* resources allocated */
#define IFF_NOARP 0x0080 /* no address resolution protocol */
#define IFF_PROMISC 0x0100 /* receive all packets */
#define IFF_ALLMULTI 0x0200 /* receive all multicast packets */
#define IFF_OACTIVE 0x0400 /* transmission in progress */
#define IFF_SIMPLEX 0x0800 /* can't hear own transmissions */
#define IFF_LINK0 0x1000 /* per link layer defined bit */
#define IFF_LINK1 0x2000 /* per link layer defined bit */
#define IFF_LINK2 0x4000 /* per link layer defined bit */
#define IFF_MULTICAST 0x8000 /* supports multicast */

#define IFFBITS \
"\020\1UP\2BROADCAST\3DEBUG\4LOOPBACK\5POINTOPOINT\6NOTRAILERS" \
"\7RUNNING\10NOARP\11PROMISC\12ALLMULTI\13OACTIVE\14SIMPLEX" \
"\15LINK0\16LINK1\17LINK2\20MULTICAST"

/* flags set internally only: */
#define IFF_CANTCHANGE \
(IFF_BROADCAST|IFF_POINTOPOINT|IFF_RUNNING|IFF_OACTIVE|\
IFF_SIMPLEX|IFF_MULTICAST|IFF_ALLMULTI|IFF_PROMISC)

/*
* Some convenience macros used for setting ifi_baudrate.
* XXX 1000 vs. 1024? --thorpej@NetBSD.org
*/
#define IF_Kbps(x) ((x) * 1000) /* kilobits/sec. */
#define IF_Mbps(x) (IF_Kbps((x) * 1000)) /* megabits/sec. */
#define IF_Gbps(x) (IF_Mbps((x) * 1000)) /* gigabits/sec. */

/* Capabilities that interfaces can advertise. */
/* 0x01 .. 0x40 were previously used */
#define IFCAP_TSOv4 0x00080 /* can do TCPv4 segmentation offload */
#define IFCAP_CSUM_IPv4_Rx 0x00100 /* can do IPv4 header checksums (Rx) */
#define IFCAP_CSUM_IPv4_Tx 0x00200 /* can do IPv4 header checksums (Tx) */
#define IFCAP_CSUM_TCPv4_Rx 0x00400 /* can do IPv4/TCP checksums (Rx) */
#define IFCAP_CSUM_TCPv4_Tx 0x00800 /* can do IPv4/TCP checksums (Tx) */
#define IFCAP_CSUM_UDPv4_Rx 0x01000 /* can do IPv4/UDP checksums (Rx) */
#define IFCAP_CSUM_UDPv4_Tx 0x02000 /* can do IPv4/UDP checksums (Tx) */
#define IFCAP_CSUM_TCPv6_Rx 0x04000 /* can do IPv6/TCP checksums (Rx) */
#define IFCAP_CSUM_TCPv6_Tx 0x08000 /* can do IPv6/TCP checksums (Tx) */
#define IFCAP_CSUM_UDPv6_Rx 0x10000 /* can do IPv6/UDP checksums (Rx) */
#define IFCAP_CSUM_UDPv6_Tx 0x20000 /* can do IPv6/UDP checksums (Tx) */
#define IFCAP_TSOv6 0x40000 /* can do TCPv6 segmentation offload */
#define IFCAP_MASK 0x7ff80 /* currently valid capabilities */

#define IFCAPBITS \
"\020" \
"\10TSO4" \
"\11IP4CSUM_Rx" \
"\12IP4CSUM_Tx" \
"\13TCP4CSUM_Rx" \
"\14TCP4CSUM_Tx" \
"\15UDP4CSUM_Rx" \
"\16UDP4CSUM_Tx" \
"\17TCP6CSUM_Rx" \
"\20TCP6CSUM_Tx" \
"\21UDP6CSUM_Rx" \
"\22UDP6CSUM_Tx" \
"\23TSO6"

/*
* Output queues (ifp->if_snd) and internetwork datagram level (pup level 1)
* input routines have queues of messages stored on ifqueue structures
* (defined above). Entries are added to and deleted from these structures
* by these macros, which should be called with ipl raised to splnet().
*/
#define IF_QFULL(ifq) ((ifq)->ifq_len >= (ifq)->ifq_maxlen)
#define IF_DROP(ifq) ((ifq)->ifq_drops++)
#define IF_ENQUEUE(ifq, m) do { \
(m)->m_nextpkt = 0; \
if ((ifq)->ifq_tail == 0) \
(ifq)->ifq_head = m; \
else \
(ifq)->ifq_tail->m_nextpkt = m; \
(ifq)->ifq_tail = m; \
(ifq)->ifq_len++; \
} while (/*CONSTCOND*/0)
#define IF_PREPEND(ifq, m) do { \
(m)->m_nextpkt = (ifq)->ifq_head; \
if ((ifq)->ifq_tail == 0) \
(ifq)->ifq_tail = (m); \
(ifq)->ifq_head = (m); \
(ifq)->ifq_len++; \
} while (/*CONSTCOND*/0)
#define IF_DEQUEUE(ifq, m) do { \
(m) = (ifq)->ifq_head; \
if (m) { \
if (((ifq)->ifq_head = (m)->m_nextpkt) == 0) \
(ifq)->ifq_tail = 0; \
(m)->m_nextpkt = 0; \
(ifq)->ifq_len--; \
} \
} while (/*CONSTCOND*/0)
#define IF_POLL(ifq, m) ((m) = (ifq)->ifq_head)
#define IF_PURGE(ifq) \
do { \
struct mbuf *__m0; \
\
for (;;) { \
IF_DEQUEUE((ifq), __m0); \
if (__m0 == NULL) \
break; \
else \
m_freem(__m0); \
} \
} while (/*CONSTCOND*/ 0)
#define IF_IS_EMPTY(ifq) ((ifq)->ifq_len == 0)

#ifndef IFQ_MAXLEN
#define IFQ_MAXLEN 256
#endif
#define IFNET_SLOWHZ 1 /* granularity is 1 second */

/*
* Structure defining statistics and other data kept regarding an address
* on a network interface.
*/
struct ifaddr_data {
int64_t ifad_inbytes;
int64_t ifad_outbytes;
};

/*
* The ifaddr structure contains information about one address
* of an interface. They are maintained by the different address families,
* are allocated and attached when an address is set, and are linked
* together so all addresses for an interface can be located.
*/
struct ifaddr {
struct sockaddr *ifa_addr; /* address of interface */
struct sockaddr *ifa_dstaddr; /* other end of p-to-p link */
#define ifa_broadaddr ifa_dstaddr /* broadcast address interface */
struct sockaddr *ifa_netmask; /* used to determine subnet */
struct ifnet *ifa_ifp; /* back-pointer to interface */
TAILQ_ENTRY(ifaddr) ifa_list; /* list of addresses for interface */
struct ifaddr_data ifa_data; /* statistics on the address */
void (*ifa_rtrequest) /* check or clean routes (+ or -)'d */
(int, struct rtentry *, const struct rt_addrinfo *);
u_int ifa_flags; /* mostly rt_flags for cloning */
int ifa_refcnt; /* count of references */
int ifa_metric; /* cost of going out this interface */
struct ifaddr *(*ifa_getifa)(struct ifaddr *,
const struct sockaddr *);
uint32_t *ifa_seqno;
int16_t ifa_preference; /* preference level for this address */
};
#define IFA_ROUTE RTF_UP /* (0x01) route installed */

/*
* Message format for use in obtaining information about interfaces from
* sysctl and the routing socket. We need to force 64-bit alignment if we
* aren't using compatiblity definitons.
*/
#if !defined(_KERNEL) || !defined(COMPAT_RTSOCK)
#define __align64 __aligned(sizeof(uint64_t))
#else
#define __align64
#endif
struct if_msghdr {
u_short ifm_msglen __align64;
/* to skip over non-understood messages */
u_char ifm_version; /* future binary compatibility */
u_char ifm_type; /* message type */
int ifm_addrs; /* like rtm_addrs */
int ifm_flags; /* value of if_flags */
u_short ifm_index; /* index for associated ifp */
struct if_data ifm_data __align64;
/* statistics and other data about if */
};

/*
* Message format for use in obtaining information about interface addresses
* from sysctl and the routing socket.
*/
struct ifa_msghdr {
u_short ifam_msglen __align64;
/* to skip over non-understood messages */
u_char ifam_version; /* future binary compatibility */
u_char ifam_type; /* message type */
int ifam_addrs; /* like rtm_addrs */
int ifam_flags; /* value of ifa_flags */
int ifam_metric; /* value of ifa_metric */
u_short ifam_index; /* index for associated ifp */
};

/*
* Message format announcing the arrival or departure of a network interface.
*/
struct if_announcemsghdr {
u_short ifan_msglen __align64;
/* to skip over non-understood messages */
u_char ifan_version; /* future binary compatibility */
u_char ifan_type; /* message type */
u_short ifan_index; /* index for associated ifp */
char ifan_name[IFNAMSIZ]; /* if name, e.g. "en0" */
u_short ifan_what; /* what type of announcement */
};

#define IFAN_ARRIVAL 0 /* interface arrival */
#define IFAN_DEPARTURE 1 /* interface departure */

#undef __align64

/*
* Interface request structure used for socket
* ioctl's. All interface ioctl's must have parameter
* definitions which begin with ifr_name. The
* remainder may be interface specific.
*/
struct ifreq {
char ifr_name[IFNAMSIZ]; /* if name, e.g. "en0" */
union {
struct sockaddr ifru_addr;
struct sockaddr ifru_dstaddr;
struct sockaddr ifru_broadaddr;
struct sockaddr_storage ifru_space;
short ifru_flags;
int ifru_metric;
int ifru_mtu;
int ifru_dlt;
u_int ifru_value;
void * ifru_data;
struct {
uint32_t b_buflen;
void *b_buf;
} ifru_b;
} ifr_ifru;
#define ifr_addr ifr_ifru.ifru_addr /* address */
#define ifr_dstaddr ifr_ifru.ifru_dstaddr /* other end of p-to-p link */
#define ifr_broadaddr ifr_ifru.ifru_broadaddr /* broadcast address */
#define ifr_space ifr_ifru.ifru_space /* sockaddr_storage */
#define ifr_flags ifr_ifru.ifru_flags /* flags */
#define ifr_metric ifr_ifru.ifru_metric /* metric */
#define ifr_mtu ifr_ifru.ifru_mtu /* mtu */
#define ifr_dlt ifr_ifru.ifru_dlt /* data link type (DLT_*) */
#define ifr_value ifr_ifru.ifru_value /* generic value */
#define ifr_media ifr_ifru.ifru_metric /* media options (overload) */
#define ifr_data ifr_ifru.ifru_data /* for use by interface
* XXX deprecated
*/
#define ifr_buf ifr_ifru.ifru_b.b_buf /* new interface ioctls */
#define ifr_buflen ifr_ifru.ifru_b.b_buflen
#define ifr_index ifr_ifru.ifru_value /* interface index, BSD */
#define ifr_ifindex ifr_index /* interface index, linux */
};

#ifdef _KERNEL
#define ifreq_setdstaddr ifreq_setaddr
#define ifreq_setbroadaddr ifreq_setaddr
#define ifreq_getdstaddr ifreq_getaddr
#define ifreq_getbroadaddr ifreq_getaddr

static inline const struct sockaddr *
/*ARGSUSED*/
ifreq_getaddr(u_long cmd, const struct ifreq *ifr)
{
return &ifr->ifr_addr;
}
#endif /* _KERNEL */

struct ifcapreq {
char ifcr_name[IFNAMSIZ]; /* if name, e.g. "en0" */
uint64_t ifcr_capabilities; /* supported capabiliites */
uint64_t ifcr_capenable; /* capabilities enabled */
};

struct ifaliasreq {
char ifra_name[IFNAMSIZ]; /* if name, e.g. "en0" */
struct sockaddr ifra_addr;
struct sockaddr ifra_dstaddr;
#define ifra_broadaddr ifra_dstaddr
struct sockaddr ifra_mask;
};

struct ifdatareq {
char ifdr_name[IFNAMSIZ]; /* if name, e.g. "en0" */
struct if_data ifdr_data;
};

struct ifmediareq {
char ifm_name[IFNAMSIZ]; /* if name, e.g. "en0" */
int ifm_current; /* current media options */
int ifm_mask; /* don't care mask */
int ifm_status; /* media status */
int ifm_active; /* active options */
int ifm_count; /* # entries in ifm_ulist
array */
int *ifm_ulist; /* media words */
};


struct ifdrv {
char ifd_name[IFNAMSIZ]; /* if name, e.g. "en0" */
unsigned long ifd_cmd;
size_t ifd_len;
void *ifd_data;
};
#define IFLINKSTR_QUERYLEN 0x01
#define IFLINKSTR_UNSET 0x02

/*
* Structure used in SIOCGIFCONF request.
* Used to retrieve interface configuration
* for machine (useful for programs which
* must know all networks accessible).
*/
struct ifconf {
int ifc_len; /* size of associated buffer */
union {
void * ifcu_buf;
struct ifreq *ifcu_req;
} ifc_ifcu;
#define ifc_buf ifc_ifcu.ifcu_buf /* buffer address */
#define ifc_req ifc_ifcu.ifcu_req /* array of structures returned */
};

/*
* Structure for SIOC[AGD]LIFADDR
*/
struct if_laddrreq {
char iflr_name[IFNAMSIZ];
unsigned int flags;
#define IFLR_PREFIX 0x8000 /* in: prefix given out: kernel fills id */
#define IFLR_ACTIVE 0x4000 /* in/out: link-layer address activation */
#define IFLR_FACTORY 0x2000 /* in/out: factory link-layer address */
unsigned int prefixlen; /* in/out */
struct sockaddr_storage addr; /* in/out */
struct sockaddr_storage dstaddr; /* out */
};

/*
* Structure for SIOC[SG]IFADDRPREF
*/
struct if_addrprefreq {
char ifap_name[IFNAMSIZ];
int16_t ifap_preference; /* in/out */
struct sockaddr_storage ifap_addr; /* in/out */
};

#include <net/if_arp.h>

#endif /* _NETBSD_SOURCE */

#ifdef _KERNEL
#ifdef IFAREF_DEBUG
#define IFAREF(ifa) \
do { \
printf("IFAREF: %s:%d %p -> %d\n", __FILE__, __LINE__, \
(ifa), ++(ifa)->ifa_refcnt); \
} while (/*CONSTCOND*/ 0)

#define IFAFREE(ifa) \
do { \
if ((ifa)->ifa_refcnt <= 0) \
panic("%s:%d: %p ifa_refcnt <= 0", __FILE__, \
__LINE__, (ifa)); \
printf("IFAFREE: %s:%d %p -> %d\n", __FILE__, __LINE__, \
(ifa), --(ifa)->ifa_refcnt); \
if ((ifa)->ifa_refcnt == 0) \
ifafree(ifa); \
} while (/*CONSTCOND*/ 0)
#else
#define IFAREF(ifa) (ifa)->ifa_refcnt++

#ifdef DIAGNOSTIC
#define IFAFREE(ifa) \
do { \
if ((ifa)->ifa_refcnt <= 0) \
panic("%s:%d: %p ifa_refcnt <= 0", __FILE__, \
__LINE__, (ifa)); \
if (--(ifa)->ifa_refcnt == 0) \
ifafree(ifa); \
} while (/*CONSTCOND*/ 0)
#else
#define IFAFREE(ifa) \
do { \
if (--(ifa)->ifa_refcnt == 0) \
ifafree(ifa); \
} while (/*CONSTCOND*/ 0)
#endif /* DIAGNOSTIC */
#endif /* IFAREF_DEBUG */

#ifdef ALTQ
#define ALTQ_DECL(x) x
#define ALTQ_COMMA ,

#define IFQ_ENQUEUE(ifq, m, pattr, err) \
do { \
if (ALTQ_IS_ENABLED((ifq))) \
ALTQ_ENQUEUE((ifq), (m), (pattr), (err)); \
else { \
if (IF_QFULL((ifq))) { \
m_freem((m)); \
(err) = ENOBUFS; \
} else { \
IF_ENQUEUE((ifq), (m)); \
(err) = 0; \
} \
} \
if ((err)) \
(ifq)->ifq_drops++; \
} while (/*CONSTCOND*/ 0)

#define IFQ_DEQUEUE(ifq, m) \
do { \
if (TBR_IS_ENABLED((ifq))) \
(m) = tbr_dequeue((ifq), ALTDQ_REMOVE); \
else if (ALTQ_IS_ENABLED((ifq))) \
ALTQ_DEQUEUE((ifq), (m)); \
else \
IF_DEQUEUE((ifq), (m)); \
} while (/*CONSTCOND*/ 0)

#define IFQ_POLL(ifq, m) \
do { \
if (TBR_IS_ENABLED((ifq))) \
(m) = tbr_dequeue((ifq), ALTDQ_POLL); \
else if (ALTQ_IS_ENABLED((ifq))) \
ALTQ_POLL((ifq), (m)); \
else \
IF_POLL((ifq), (m)); \
} while (/*CONSTCOND*/ 0)

#define IFQ_PURGE(ifq) \
do { \
if (ALTQ_IS_ENABLED((ifq))) \
ALTQ_PURGE((ifq)); \
else \
IF_PURGE((ifq)); \
} while (/*CONSTCOND*/ 0)

#define IFQ_SET_READY(ifq) \
do { \
(ifq)->altq_flags |= ALTQF_READY; \
} while (/*CONSTCOND*/ 0)

#define IFQ_CLASSIFY(ifq, m, af, pattr) \
do { \
if (ALTQ_IS_ENABLED((ifq))) { \
if (ALTQ_NEEDS_CLASSIFY((ifq))) \
(pattr)->pattr_class = (*(ifq)->altq_classify) \
((ifq)->altq_clfier, (m), (af)); \
(pattr)->pattr_af = (af); \
(pattr)->pattr_hdr = mtod((m), void *); \
} \
} while (/*CONSTCOND*/ 0)
#else /* ! ALTQ */
#define ALTQ_DECL(x) /* nothing */
#define ALTQ_COMMA

#define IFQ_ENQUEUE(ifq, m, pattr, err) \
do { \
if (IF_QFULL((ifq))) { \
m_freem((m)); \
(err) = ENOBUFS; \
} else { \
IF_ENQUEUE((ifq), (m)); \
(err) = 0; \
} \
if ((err)) \
(ifq)->ifq_drops++; \
} while (/*CONSTCOND*/ 0)

#define IFQ_DEQUEUE(ifq, m) IF_DEQUEUE((ifq), (m))

#define IFQ_POLL(ifq, m) IF_POLL((ifq), (m))

#define IFQ_PURGE(ifq) IF_PURGE((ifq))

#define IFQ_SET_READY(ifq) /* nothing */

#define IFQ_CLASSIFY(ifq, m, af, pattr) /* nothing */

#endif /* ALTQ */

#define IFQ_IS_EMPTY(ifq) IF_IS_EMPTY((ifq))
#define IFQ_INC_LEN(ifq) ((ifq)->ifq_len++)
#define IFQ_DEC_LEN(ifq) (--(ifq)->ifq_len)
#define IFQ_INC_DROPS(ifq) ((ifq)->ifq_drops++)
#define IFQ_SET_MAXLEN(ifq, len) ((ifq)->ifq_maxlen = (len))

#include <sys/mallocvar.h>
MALLOC_DECLARE(M_IFADDR);
MALLOC_DECLARE(M_IFMADDR);

#define IFNET_FIRST() TAILQ_FIRST(&ifnet)
#define IFNET_NEXT(__ifp) TAILQ_NEXT((__ifp), if_list)
#define IFNET_FOREACH(__ifp) TAILQ_FOREACH(__ifp, &ifnet, if_list)
#define IFADDR_FIRST(__ifp) TAILQ_FIRST(&(__ifp)->if_addrlist)
#define IFADDR_NEXT(__ifa) TAILQ_NEXT((__ifa), ifa_list)
#define IFADDR_FOREACH(__ifa, __ifp) TAILQ_FOREACH(__ifa, \
&(__ifp)->if_addrlist, ifa_list)
#define IFADDR_EMPTY(__ifp) TAILQ_EMPTY(&(__ifp)->if_addrlist)

extern struct ifnet_head ifnet;
extern struct ifnet **ifindex2ifnet;
extern struct ifnet *lo0ifp;
extern size_t if_indexlim;

int ifreq_setaddr(u_long, struct ifreq *, const struct sockaddr *);

struct ifnet *if_alloc(u_char);
void if_free(struct ifnet *);
void if_initname(struct ifnet *, const char *, int);
struct ifaddr *if_dl_create(const struct ifnet *, const struct sockaddr_dl **);
void if_activate_sadl(struct ifnet *, struct ifaddr *,
    const struct sockaddr_dl *);
void if_set_sadl(struct ifnet *, const void *, u_char, bool);
void if_alloc_sadl(struct ifnet *);
void if_free_sadl(struct ifnet *);
void if_attach(struct ifnet *);
void if_attachdomain(void);
void if_attachdomain1(struct ifnet *);
void if_deactivate(struct ifnet *);
void if_purgeaddrs(struct ifnet *, int, void (*)(struct ifaddr *));
void if_detach(struct ifnet *);
void if_down(struct ifnet *);
void if_link_state_change(struct ifnet *, int);
void if_slowtimo(void *);
void if_up(struct ifnet *);
int ifconf(u_long, void *);
void ifinit(void);
void ifinit1(void);
int ifaddrpref_ioctl(struct socket *, u_long, void *, struct ifnet *,
    lwp_t *);
int ifioctl(struct socket *, u_long, void *, struct lwp *);
int ifioctl_common(struct ifnet *, u_long, void *);
int ifpromisc(struct ifnet *, int);
struct ifnet *ifunit(const char *);
int if_addr_init(ifnet_t *, struct ifaddr *, bool);
int if_mcast_op(ifnet_t *, const unsigned long, const struct sockaddr *);
int if_flags_set(struct ifnet *, const short);

void ifa_insert(struct ifnet *, struct ifaddr *);
void ifa_remove(struct ifnet *, struct ifaddr *);

struct ifaddr *ifa_ifwithaddr(const struct sockaddr *);
struct ifaddr *ifa_ifwithaf(int);
struct ifaddr *ifa_ifwithdstaddr(const struct sockaddr *);
struct ifaddr *ifa_ifwithnet(const struct sockaddr *);
struct ifaddr *ifa_ifwithladdr(const struct sockaddr *);
struct ifaddr *ifa_ifwithroute(int, const struct sockaddr *,
const struct sockaddr *);
struct ifaddr *ifaof_ifpforaddr(const struct sockaddr *, struct ifnet *);
void ifafree(struct ifaddr *);
void link_rtrequest(int, struct rtentry *, const struct rt_addrinfo *);

void if_clone_attach(struct if_clone *);
void if_clone_detach(struct if_clone *);

int if_clone_create(const char *);
int if_clone_destroy(const char *);

int ifq_enqueue(struct ifnet *, struct mbuf * ALTQ_COMMA
    ALTQ_DECL(struct altq_pktattr *));
int ifq_enqueue2(struct ifnet *, struct ifqueue *, struct mbuf * ALTQ_COMMA
    ALTQ_DECL(struct altq_pktattr *));

int loioctl(struct ifnet *, u_long, void *);
void loopattach(int);
int looutput(struct ifnet *,
struct mbuf *, const struct sockaddr *, struct rtentry *);
void lortrequest(int, struct rtentry *, const struct rt_addrinfo *);

/*
* These are exported because they're an easy way to tell if
* an interface is going away without having to burn a flag.
*/
int if_nulloutput(struct ifnet *, struct mbuf *,
const struct sockaddr *, struct rtentry *);
void if_nullinput(struct ifnet *, struct mbuf *);
void if_nullstart(struct ifnet *);
int if_nullioctl(struct ifnet *, u_long, void *);
int if_nullinit(struct ifnet *);
void if_nullstop(struct ifnet *, int);
void if_nullwatchdog(struct ifnet *);
void if_nulldrain(struct ifnet *);
#else
struct if_nameindex {
unsigned int if_index; /* 1, 2, ... */
char *if_name; /* null terminated name: "le0", ... */
};

#include <sys/cdefs.h>
__BEGIN_DECLS
unsigned int if_nametoindex(const char *);
char * if_indextoname(unsigned int, char *);
struct if_nameindex * if_nameindex(void);
void if_freenameindex(struct if_nameindex *);
__END_DECLS
#endif /* _KERNEL */ /* XXX really ALTQ? */

#ifdef _KERNEL

ifnet_t * if_byindex(u_int);

/*
* ifq sysctl support
*/
int sysctl_ifq(int *name, u_int namelen, void *oldp,
size_t *oldlenp, void *newp, size_t newlen,
struct ifqueue *ifq);
/* symbolic names for terminal (per-protocol) CTL_IFQ_ nodes */
#define IFQCTL_LEN 1
#define IFQCTL_MAXLEN 2
#define IFQCTL_PEAK 3
#define IFQCTL_DROPS 4
#define IFQCTL_MAXID 5

#endif /* _KERNEL */

#ifdef _NETBSD_SOURCE
/*
* sysctl for ifq (per-protocol packet input queue variant of ifqueue)
*/
#define CTL_IFQ_NAMES { \
{ 0, 0 }, \
{ "len", CTLTYPE_INT }, \
{ "maxlen", CTLTYPE_INT }, \
{ "peak", CTLTYPE_INT }, \
{ "drops", CTLTYPE_INT }, \
}
#endif /* _NETBSD_SOURCE */
#endif /* !_NET_IF_H_ */
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