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freebsd-skq/sys/net/if_var.h
melifaro 93152c67c9 Implement interface link header precomputation API. 
Add if_requestencap() interface method which is capable of calculating
  various link headers for given interface. Right now there is support
  for INET/INET6/ARP llheader calculation (IFENCAP_LL type request).
  Other types are planned to support more complex calculation
  (L2 multipath lagg nexthops, tunnel encap nexthops, etc..).

Reshape 'struct route' to be able to pass additional data (with is length)
  to prepend to mbuf.

These two changes permits routing code to pass pre-calculated nexthop data
  (like L2 header for route w/gateway) down to the stack eliminating the
  need for other lookups. It also brings us closer to more complex scenarios
  like transparently handling MPLS nexthops and tunnel interfaces.
  Last, but not least, it removes layering violation introduced by flowtable
  code (ro_lle) and simplifies handling of existing if_output consumers.

ARP/ND changes:
Make arp/ndp stack pre-calculate link header upon installing/updating lle
  record. Interface link address change are handled by re-calculating
  headers for all lles based on if_lladdr event. After these changes,
  arpresolve()/nd6_resolve() returns full pre-calculated header for
  supported interfaces thus simplifying if_output().
Move these lookups to separate ether_resolve_addr() function which ether
  returs error or fully-prepared link header. Add <arp|nd6_>resolve_addr()
  compat versions to return link addresses instead of pre-calculated data.

BPF changes:
Raw bpf writes occupied _two_ cases: AF_UNSPEC and pseudo_AF_HDRCMPLT.
Despite the naming, both of there have ther header "complete". The only
  difference is that interface source mac has to be filled by OS for
  AF_UNSPEC (controlled via BIOCGHDRCMPLT). This logic has to stay inside
  BPF and not pollute if_output() routines. Convert BPF to pass prepend data
  via new 'struct route' mechanism. Note that it does not change
  non-optimized if_output(): ro_prepend handling is purely optional.
Side note: hackish pseudo_AF_HDRCMPLT is supported for ethernet and FDDI.
  It is not needed for ethernet anymore. The only remaining FDDI user is
  dev/pdq mostly untouched since 2007. FDDI support was eliminated from
  OpenBSD in 2013 (sys/net/if_fddisubr.c rev 1.65).

Flowtable changes:
  Flowtable violates layering by saving (and not correctly managing)
  rtes/lles. Instead of passing lle pointer, pass pointer to pre-calculated
  header data from that lle.

Differential Revision:	https://reviews.freebsd.org/D4102
2015-12-31 05:03:27 +00:00

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/*-
* 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.
* 4. 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.
*
* From: @(#)if.h 8.1 (Berkeley) 6/10/93
* $FreeBSD$
*/
#ifndef _NET_IF_VAR_H_
#define _NET_IF_VAR_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 three 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 an 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 an 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
*/
struct rtentry; /* ifa_rtrequest */
struct rt_addrinfo; /* ifa_rtrequest */
struct socket;
struct carp_if;
struct carp_softc;
struct ifvlantrunk;
struct route; /* if_output */
struct vnet;
struct ifmedia;
struct netmap_adapter;
#ifdef _KERNEL
#include <sys/mbuf.h> /* ifqueue only? */
#include <sys/buf_ring.h>
#include <net/vnet.h>
#endif /* _KERNEL */
#include <sys/counter.h>
#include <sys/lock.h> /* XXX */
#include <sys/mutex.h> /* struct ifqueue */
#include <sys/rwlock.h> /* XXX */
#include <sys/sx.h> /* XXX */
#include <sys/_task.h> /* if_link_task */
#define IF_DUNIT_NONE -1
#include <net/altq/if_altq.h>
TAILQ_HEAD(ifnethead, ifnet); /* we use TAILQs so that the order of */
TAILQ_HEAD(ifaddrhead, ifaddr); /* instantiation is preserved in the list */
TAILQ_HEAD(ifmultihead, ifmultiaddr);
TAILQ_HEAD(ifgrouphead, ifg_group);
#ifdef _KERNEL
VNET_DECLARE(struct pfil_head, link_pfil_hook); /* packet filter hooks */
#define V_link_pfil_hook VNET(link_pfil_hook)
#define HHOOK_IPSEC_INET 0
#define HHOOK_IPSEC_INET6 1
#define HHOOK_IPSEC_COUNT 2
VNET_DECLARE(struct hhook_head *, ipsec_hhh_in[HHOOK_IPSEC_COUNT]);
VNET_DECLARE(struct hhook_head *, ipsec_hhh_out[HHOOK_IPSEC_COUNT]);
#define V_ipsec_hhh_in VNET(ipsec_hhh_in)
#define V_ipsec_hhh_out VNET(ipsec_hhh_out)
#endif /* _KERNEL */
typedef enum {
IFCOUNTER_IPACKETS = 0,
IFCOUNTER_IERRORS,
IFCOUNTER_OPACKETS,
IFCOUNTER_OERRORS,
IFCOUNTER_COLLISIONS,
IFCOUNTER_IBYTES,
IFCOUNTER_OBYTES,
IFCOUNTER_IMCASTS,
IFCOUNTER_OMCASTS,
IFCOUNTER_IQDROPS,
IFCOUNTER_OQDROPS,
IFCOUNTER_NOPROTO,
IFCOUNTERS /* Array size. */
} ift_counter;
typedef struct ifnet * if_t;
typedef void (*if_start_fn_t)(if_t);
typedef int (*if_ioctl_fn_t)(if_t, u_long, caddr_t);
typedef void (*if_init_fn_t)(void *);
typedef void (*if_qflush_fn_t)(if_t);
typedef int (*if_transmit_fn_t)(if_t, struct mbuf *);
typedef uint64_t (*if_get_counter_t)(if_t, ift_counter);
struct ifnet_hw_tsomax {
u_int tsomaxbytes; /* TSO total burst length limit in bytes */
u_int tsomaxsegcount; /* TSO maximum segment count */
u_int tsomaxsegsize; /* TSO maximum segment size in bytes */
};
/* Interface encap request types */
typedef enum {
IFENCAP_LL = 1 /* pre-calculate link-layer header */
} ife_type;
/*
* The structure below allows to request various pre-calculated L2/L3 headers
* for different media. Requests varies by type (rtype field).
*
* IFENCAP_LL type: pre-calculates link header based on address family
* and destination lladdr.
*
* Input data fields:
* buf: pointer to destination buffer
* bufsize: buffer size
* flags: IFENCAP_FLAG_BROADCAST if destination is broadcast
* family: address family defined by AF_ constant.
* lladdr: pointer to link-layer address
* lladdr_len: length of link-layer address
* hdata: pointer to L3 header (optional, used for ARP requests).
* Output data fields:
* buf: encap data is stored here
* bufsize: resulting encap length is stored here
* lladdr_off: offset of link-layer address from encap hdr start
* hdata: L3 header may be altered if necessary
*/
struct if_encap_req {
u_char *buf; /* Destination buffer (w) */
size_t bufsize; /* size of provided buffer (r) */
ife_type rtype; /* request type (r) */
uint32_t flags; /* Request flags (r) */
int family; /* Address family AF_* (r) */
int lladdr_off; /* offset from header start (w) */
int lladdr_len; /* lladdr length (r) */
char *lladdr; /* link-level address pointer (r) */
char *hdata; /* Upper layer header data (rw) */
};
#define IFENCAP_FLAG_BROADCAST 0x02 /* Destination is broadcast */
/*
* Structure defining a network interface.
*
* Size ILP32: 592 (approx)
* LP64: 1048 (approx)
*/
struct ifnet {
/* General book keeping of interface lists. */
TAILQ_ENTRY(ifnet) if_link; /* all struct ifnets are chained */
LIST_ENTRY(ifnet) if_clones; /* interfaces of a cloner */
TAILQ_HEAD(, ifg_list) if_groups; /* linked list of groups per if */
/* protected by if_addr_lock */
u_char if_alloctype; /* if_type at time of allocation */
/* Driver and protocol specific information that remains stable. */
void *if_softc; /* pointer to driver state */
void *if_llsoftc; /* link layer softc */
void *if_l2com; /* pointer to protocol bits */
const char *if_dname; /* driver name */
int if_dunit; /* unit or IF_DUNIT_NONE */
u_short if_index; /* numeric abbreviation for this if */
short if_index_reserved; /* spare space to grow if_index */
char if_xname[IFNAMSIZ]; /* external name (name + unit) */
char *if_description; /* interface description */
/* Variable fields that are touched by the stack and drivers. */
int if_flags; /* up/down, broadcast, etc. */
int if_drv_flags; /* driver-managed status flags */
int if_capabilities; /* interface features & capabilities */
int if_capenable; /* enabled features & capabilities */
void *if_linkmib; /* link-type-specific MIB data */
size_t if_linkmiblen; /* length of above data */
u_int if_refcount; /* reference count */
/* These fields are shared with struct if_data. */
uint8_t if_type; /* ethernet, tokenring, etc */
uint8_t if_addrlen; /* media address length */
uint8_t if_hdrlen; /* media header length */
uint8_t if_link_state; /* current link state */
uint32_t if_mtu; /* maximum transmission unit */
uint32_t if_metric; /* routing metric (external only) */
uint64_t if_baudrate; /* linespeed */
uint64_t if_hwassist; /* HW offload capabilities, see IFCAP */
time_t if_epoch; /* uptime at attach or stat reset */
struct timeval if_lastchange; /* time of last administrative change */
struct ifaltq if_snd; /* output queue (includes altq) */
struct task if_linktask; /* task for link change events */
/* Addresses of different protocol families assigned to this if. */
struct rwlock if_addr_lock; /* lock to protect address lists */
/*
* if_addrhead is the list of all addresses associated to
* an interface.
* Some code in the kernel assumes that first element
* of the list has type AF_LINK, and contains sockaddr_dl
* addresses which store the link-level address and the name
* of the interface.
* However, access to the AF_LINK address through this
* field is deprecated. Use if_addr or ifaddr_byindex() instead.
*/
struct ifaddrhead if_addrhead; /* linked list of addresses per if */
struct ifmultihead if_multiaddrs; /* multicast addresses configured */
int if_amcount; /* number of all-multicast requests */
struct ifaddr *if_addr; /* pointer to link-level address */
const u_int8_t *if_broadcastaddr; /* linklevel broadcast bytestring */
struct rwlock if_afdata_lock;
void *if_afdata[AF_MAX];
int if_afdata_initialized;
/* Additional features hung off the interface. */
u_int if_fib; /* interface FIB */
struct vnet *if_vnet; /* pointer to network stack instance */
struct vnet *if_home_vnet; /* where this ifnet originates from */
struct ifvlantrunk *if_vlantrunk; /* pointer to 802.1q data */
struct bpf_if *if_bpf; /* packet filter structure */
int if_pcount; /* number of promiscuous listeners */
void *if_bridge; /* bridge glue */
void *if_lagg; /* lagg glue */
void *if_pf_kif; /* pf glue */
struct carp_if *if_carp; /* carp interface structure */
struct label *if_label; /* interface MAC label */
struct netmap_adapter *if_netmap; /* netmap(4) softc */
/* Various procedures of the layer2 encapsulation and drivers. */
int (*if_output) /* output routine (enqueue) */
(struct ifnet *, struct mbuf *, const struct sockaddr *,
struct route *);
void (*if_input) /* input routine (from h/w driver) */
(struct ifnet *, struct mbuf *);
if_start_fn_t if_start; /* initiate output routine */
if_ioctl_fn_t if_ioctl; /* ioctl routine */
if_init_fn_t if_init; /* Init routine */
int (*if_resolvemulti) /* validate/resolve multicast */
(struct ifnet *, struct sockaddr **, struct sockaddr *);
if_qflush_fn_t if_qflush; /* flush any queue */
if_transmit_fn_t if_transmit; /* initiate output routine */
void (*if_reassign) /* reassign to vnet routine */
(struct ifnet *, struct vnet *, char *);
if_get_counter_t if_get_counter; /* get counter values */
int (*if_requestencap) /* make link header from request */
(struct ifnet *, struct if_encap_req *);
/* Statistics. */
counter_u64_t if_counters[IFCOUNTERS];
/* Stuff that's only temporary and doesn't belong here. */
/*
* Network adapter TSO limits:
* ===========================
*
* If the "if_hw_tsomax" field is zero the maximum segment
* length limit does not apply. If the "if_hw_tsomaxsegcount"
* or the "if_hw_tsomaxsegsize" field is zero the TSO segment
* count limit does not apply. If all three fields are zero,
* there is no TSO limit.
*
* NOTE: The TSO limits should reflect the values used in the
* BUSDMA tag a network adapter is using to load a mbuf chain
* for transmission. The TCP/IP network stack will subtract
* space for all linklevel and protocol level headers and
* ensure that the full mbuf chain passed to the network
* adapter fits within the given limits.
*/
u_int if_hw_tsomax; /* TSO maximum size in bytes */
u_int if_hw_tsomaxsegcount; /* TSO maximum segment count */
u_int if_hw_tsomaxsegsize; /* TSO maximum segment size in bytes */
/*
* Spare fields to be added before branching a stable branch, so
* that structure can be enhanced without changing the kernel
* binary interface.
*/
};
/* for compatibility with other BSDs */
#define if_addrlist if_addrhead
#define if_list if_link
#define if_name(ifp) ((ifp)->if_xname)
/*
* Locks for address lists on the network interface.
*/
#define IF_ADDR_LOCK_INIT(if) rw_init(&(if)->if_addr_lock, "if_addr_lock")
#define IF_ADDR_LOCK_DESTROY(if) rw_destroy(&(if)->if_addr_lock)
#define IF_ADDR_WLOCK(if) rw_wlock(&(if)->if_addr_lock)
#define IF_ADDR_WUNLOCK(if) rw_wunlock(&(if)->if_addr_lock)
#define IF_ADDR_RLOCK(if) rw_rlock(&(if)->if_addr_lock)
#define IF_ADDR_RUNLOCK(if) rw_runlock(&(if)->if_addr_lock)
#define IF_ADDR_LOCK_ASSERT(if) rw_assert(&(if)->if_addr_lock, RA_LOCKED)
#define IF_ADDR_WLOCK_ASSERT(if) rw_assert(&(if)->if_addr_lock, RA_WLOCKED)
/*
* Function variations on locking macros intended to be used by loadable
* kernel modules in order to divorce them from the internals of address list
* locking.
*/
void if_addr_rlock(struct ifnet *ifp); /* if_addrhead */
void if_addr_runlock(struct ifnet *ifp); /* if_addrhead */
void if_maddr_rlock(if_t ifp); /* if_multiaddrs */
void if_maddr_runlock(if_t ifp); /* if_multiaddrs */
#ifdef _KERNEL
#ifdef _SYS_EVENTHANDLER_H_
/* interface link layer address change event */
typedef void (*iflladdr_event_handler_t)(void *, struct ifnet *);
EVENTHANDLER_DECLARE(iflladdr_event, iflladdr_event_handler_t);
/* interface address change event */
typedef void (*ifaddr_event_handler_t)(void *, struct ifnet *);
EVENTHANDLER_DECLARE(ifaddr_event, ifaddr_event_handler_t);
/* new interface arrival event */
typedef void (*ifnet_arrival_event_handler_t)(void *, struct ifnet *);
EVENTHANDLER_DECLARE(ifnet_arrival_event, ifnet_arrival_event_handler_t);
/* interface departure event */
typedef void (*ifnet_departure_event_handler_t)(void *, struct ifnet *);
EVENTHANDLER_DECLARE(ifnet_departure_event, ifnet_departure_event_handler_t);
/* Interface link state change event */
typedef void (*ifnet_link_event_handler_t)(void *, struct ifnet *, int);
EVENTHANDLER_DECLARE(ifnet_link_event, ifnet_link_event_handler_t);
#endif /* _SYS_EVENTHANDLER_H_ */
/*
* interface groups
*/
struct ifg_group {
char ifg_group[IFNAMSIZ];
u_int ifg_refcnt;
void *ifg_pf_kif;
TAILQ_HEAD(, ifg_member) ifg_members;
TAILQ_ENTRY(ifg_group) ifg_next;
};
struct ifg_member {
TAILQ_ENTRY(ifg_member) ifgm_next;
struct ifnet *ifgm_ifp;
};
struct ifg_list {
struct ifg_group *ifgl_group;
TAILQ_ENTRY(ifg_list) ifgl_next;
};
#ifdef _SYS_EVENTHANDLER_H_
/* group attach event */
typedef void (*group_attach_event_handler_t)(void *, struct ifg_group *);
EVENTHANDLER_DECLARE(group_attach_event, group_attach_event_handler_t);
/* group detach event */
typedef void (*group_detach_event_handler_t)(void *, struct ifg_group *);
EVENTHANDLER_DECLARE(group_detach_event, group_detach_event_handler_t);
/* group change event */
typedef void (*group_change_event_handler_t)(void *, const char *);
EVENTHANDLER_DECLARE(group_change_event, group_change_event_handler_t);
#endif /* _SYS_EVENTHANDLER_H_ */
#define IF_AFDATA_LOCK_INIT(ifp) \
rw_init(&(ifp)->if_afdata_lock, "if_afdata")
#define IF_AFDATA_WLOCK(ifp) rw_wlock(&(ifp)->if_afdata_lock)
#define IF_AFDATA_RLOCK(ifp) rw_rlock(&(ifp)->if_afdata_lock)
#define IF_AFDATA_WUNLOCK(ifp) rw_wunlock(&(ifp)->if_afdata_lock)
#define IF_AFDATA_RUNLOCK(ifp) rw_runlock(&(ifp)->if_afdata_lock)
#define IF_AFDATA_LOCK(ifp) IF_AFDATA_WLOCK(ifp)
#define IF_AFDATA_UNLOCK(ifp) IF_AFDATA_WUNLOCK(ifp)
#define IF_AFDATA_TRYLOCK(ifp) rw_try_wlock(&(ifp)->if_afdata_lock)
#define IF_AFDATA_DESTROY(ifp) rw_destroy(&(ifp)->if_afdata_lock)
#define IF_AFDATA_LOCK_ASSERT(ifp) rw_assert(&(ifp)->if_afdata_lock, RA_LOCKED)
#define IF_AFDATA_RLOCK_ASSERT(ifp) rw_assert(&(ifp)->if_afdata_lock, RA_RLOCKED)
#define IF_AFDATA_WLOCK_ASSERT(ifp) rw_assert(&(ifp)->if_afdata_lock, RA_WLOCKED)
#define IF_AFDATA_UNLOCK_ASSERT(ifp) rw_assert(&(ifp)->if_afdata_lock, RA_UNLOCKED)
/*
* 72 was chosen below because it is the size of a TCP/IP
* header (40) + the minimum mss (32).
*/
#define IF_MINMTU 72
#define IF_MAXMTU 65535
#define TOEDEV(ifp) ((ifp)->if_llsoftc)
/*
* 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.
*
* NOTE: a 'struct ifaddr' is always at the beginning of a larger
* chunk of malloc'ed memory, where we store the three addresses
* (ifa_addr, ifa_dstaddr and ifa_netmask) referenced here.
*/
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 */
struct carp_softc *ifa_carp; /* pointer to CARP data */
TAILQ_ENTRY(ifaddr) ifa_link; /* queue macro glue */
void (*ifa_rtrequest) /* check or clean routes (+ or -)'d */
(int, struct rtentry *, struct rt_addrinfo *);
u_short ifa_flags; /* mostly rt_flags for cloning */
#define IFA_ROUTE RTF_UP /* route installed */
#define IFA_RTSELF RTF_HOST /* loopback route to self installed */
u_int ifa_refcnt; /* references to this structure */
counter_u64_t ifa_ipackets;
counter_u64_t ifa_opackets;
counter_u64_t ifa_ibytes;
counter_u64_t ifa_obytes;
};
/* For compatibility with other BSDs. SCTP uses it. */
#define ifa_list ifa_link
struct ifaddr * ifa_alloc(size_t size, int flags);
void ifa_free(struct ifaddr *ifa);
void ifa_ref(struct ifaddr *ifa);
/*
* Multicast address structure. This is analogous to the ifaddr
* structure except that it keeps track of multicast addresses.
*/
struct ifmultiaddr {
TAILQ_ENTRY(ifmultiaddr) ifma_link; /* queue macro glue */
struct sockaddr *ifma_addr; /* address this membership is for */
struct sockaddr *ifma_lladdr; /* link-layer translation, if any */
struct ifnet *ifma_ifp; /* back-pointer to interface */
u_int ifma_refcount; /* reference count */
void *ifma_protospec; /* protocol-specific state, if any */
struct ifmultiaddr *ifma_llifma; /* pointer to ifma for ifma_lladdr */
};
extern struct rwlock ifnet_rwlock;
extern struct sx ifnet_sxlock;
#define IFNET_WLOCK() do { \
sx_xlock(&ifnet_sxlock); \
rw_wlock(&ifnet_rwlock); \
} while (0)
#define IFNET_WUNLOCK() do { \
rw_wunlock(&ifnet_rwlock); \
sx_xunlock(&ifnet_sxlock); \
} while (0)
/*
* To assert the ifnet lock, you must know not only whether it's for read or
* write, but also whether it was acquired with sleep support or not.
*/
#define IFNET_RLOCK_ASSERT() sx_assert(&ifnet_sxlock, SA_SLOCKED)
#define IFNET_RLOCK_NOSLEEP_ASSERT() rw_assert(&ifnet_rwlock, RA_RLOCKED)
#define IFNET_WLOCK_ASSERT() do { \
sx_assert(&ifnet_sxlock, SA_XLOCKED); \
rw_assert(&ifnet_rwlock, RA_WLOCKED); \
} while (0)
#define IFNET_RLOCK() sx_slock(&ifnet_sxlock)
#define IFNET_RLOCK_NOSLEEP() rw_rlock(&ifnet_rwlock)
#define IFNET_RUNLOCK() sx_sunlock(&ifnet_sxlock)
#define IFNET_RUNLOCK_NOSLEEP() rw_runlock(&ifnet_rwlock)
/*
* Look up an ifnet given its index; the _ref variant also acquires a
* reference that must be freed using if_rele(). It is almost always a bug
* to call ifnet_byindex() instead if ifnet_byindex_ref().
*/
struct ifnet *ifnet_byindex(u_short idx);
struct ifnet *ifnet_byindex_locked(u_short idx);
struct ifnet *ifnet_byindex_ref(u_short idx);
/*
* Given the index, ifaddr_byindex() returns the one and only
* link-level ifaddr for the interface. You are not supposed to use
* it to traverse the list of addresses associated to the interface.
*/
struct ifaddr *ifaddr_byindex(u_short idx);
VNET_DECLARE(struct ifnethead, ifnet);
VNET_DECLARE(struct ifgrouphead, ifg_head);
VNET_DECLARE(int, if_index);
VNET_DECLARE(struct ifnet *, loif); /* first loopback interface */
#define V_ifnet VNET(ifnet)
#define V_ifg_head VNET(ifg_head)
#define V_if_index VNET(if_index)
#define V_loif VNET(loif)
int if_addgroup(struct ifnet *, const char *);
int if_delgroup(struct ifnet *, const char *);
int if_addmulti(struct ifnet *, struct sockaddr *, struct ifmultiaddr **);
int if_allmulti(struct ifnet *, int);
struct ifnet* if_alloc(u_char);
void if_attach(struct ifnet *);
void if_dead(struct ifnet *);
int if_delmulti(struct ifnet *, struct sockaddr *);
void if_delmulti_ifma(struct ifmultiaddr *);
void if_detach(struct ifnet *);
void if_vmove(struct ifnet *, struct vnet *);
void if_purgeaddrs(struct ifnet *);
void if_delallmulti(struct ifnet *);
void if_down(struct ifnet *);
struct ifmultiaddr *
if_findmulti(struct ifnet *, const struct sockaddr *);
void if_free(struct ifnet *);
void if_initname(struct ifnet *, const char *, int);
void if_link_state_change(struct ifnet *, int);
int if_printf(struct ifnet *, const char *, ...) __printflike(2, 3);
void if_ref(struct ifnet *);
void if_rele(struct ifnet *);
int if_setlladdr(struct ifnet *, const u_char *, int);
void if_up(struct ifnet *);
int ifioctl(struct socket *, u_long, caddr_t, struct thread *);
int ifpromisc(struct ifnet *, int);
struct ifnet *ifunit(const char *);
struct ifnet *ifunit_ref(const char *);
int ifa_add_loopback_route(struct ifaddr *, struct sockaddr *);
int ifa_del_loopback_route(struct ifaddr *, struct sockaddr *);
int ifa_switch_loopback_route(struct ifaddr *, struct sockaddr *);
struct ifaddr *ifa_ifwithaddr(const struct sockaddr *);
int ifa_ifwithaddr_check(const struct sockaddr *);
struct ifaddr *ifa_ifwithbroadaddr(const struct sockaddr *, int);
struct ifaddr *ifa_ifwithdstaddr(const struct sockaddr *, int);
struct ifaddr *ifa_ifwithnet(const struct sockaddr *, int, int);
struct ifaddr *ifa_ifwithroute(int, const struct sockaddr *, struct sockaddr *,
u_int);
struct ifaddr *ifaof_ifpforaddr(const struct sockaddr *, struct ifnet *);
int ifa_preferred(struct ifaddr *, struct ifaddr *);
int if_simloop(struct ifnet *ifp, struct mbuf *m, int af, int hlen);
typedef void *if_com_alloc_t(u_char type, struct ifnet *ifp);
typedef void if_com_free_t(void *com, u_char type);
void if_register_com_alloc(u_char type, if_com_alloc_t *a, if_com_free_t *f);
void if_deregister_com_alloc(u_char type);
void if_data_copy(struct ifnet *, struct if_data *);
uint64_t if_get_counter_default(struct ifnet *, ift_counter);
void if_inc_counter(struct ifnet *, ift_counter, int64_t);
#define IF_LLADDR(ifp) \
LLADDR((struct sockaddr_dl *)((ifp)->if_addr->ifa_addr))
uint64_t if_setbaudrate(if_t ifp, uint64_t baudrate);
uint64_t if_getbaudrate(if_t ifp);
int if_setcapabilities(if_t ifp, int capabilities);
int if_setcapabilitiesbit(if_t ifp, int setbit, int clearbit);
int if_getcapabilities(if_t ifp);
int if_togglecapenable(if_t ifp, int togglecap);
int if_setcapenable(if_t ifp, int capenable);
int if_setcapenablebit(if_t ifp, int setcap, int clearcap);
int if_getcapenable(if_t ifp);
const char *if_getdname(if_t ifp);
int if_setdev(if_t ifp, void *dev);
int if_setdrvflagbits(if_t ifp, int if_setflags, int clear_flags);
int if_getdrvflags(if_t ifp);
int if_setdrvflags(if_t ifp, int flags);
int if_clearhwassist(if_t ifp);
int if_sethwassistbits(if_t ifp, int toset, int toclear);
int if_sethwassist(if_t ifp, int hwassist_bit);
int if_gethwassist(if_t ifp);
int if_setsoftc(if_t ifp, void *softc);
void *if_getsoftc(if_t ifp);
int if_setflags(if_t ifp, int flags);
int if_setmtu(if_t ifp, int mtu);
int if_getmtu(if_t ifp);
int if_getmtu_family(if_t ifp, int family);
int if_setflagbits(if_t ifp, int set, int clear);
int if_getflags(if_t ifp);
int if_sendq_empty(if_t ifp);
int if_setsendqready(if_t ifp);
int if_setsendqlen(if_t ifp, int tx_desc_count);
int if_input(if_t ifp, struct mbuf* sendmp);
int if_sendq_prepend(if_t ifp, struct mbuf *m);
struct mbuf *if_dequeue(if_t ifp);
int if_setifheaderlen(if_t ifp, int len);
void if_setrcvif(struct mbuf *m, if_t ifp);
void if_setvtag(struct mbuf *m, u_int16_t tag);
u_int16_t if_getvtag(struct mbuf *m);
int if_vlantrunkinuse(if_t ifp);
caddr_t if_getlladdr(if_t ifp);
void *if_gethandle(u_char);
void if_bpfmtap(if_t ifp, struct mbuf *m);
void if_etherbpfmtap(if_t ifp, struct mbuf *m);
void if_vlancap(if_t ifp);
int if_setupmultiaddr(if_t ifp, void *mta, int *cnt, int max);
int if_multiaddr_array(if_t ifp, void *mta, int *cnt, int max);
int if_multiaddr_count(if_t ifp, int max);
int if_getamcount(if_t ifp);
struct ifaddr * if_getifaddr(if_t ifp);
/* Functions */
void if_setinitfn(if_t ifp, void (*)(void *));
void if_setioctlfn(if_t ifp, int (*)(if_t, u_long, caddr_t));
void if_setstartfn(if_t ifp, void (*)(if_t));
void if_settransmitfn(if_t ifp, if_transmit_fn_t);
void if_setqflushfn(if_t ifp, if_qflush_fn_t);
void if_setgetcounterfn(if_t ifp, if_get_counter_t);
/* Revisit the below. These are inline functions originally */
int drbr_inuse_drv(if_t ifp, struct buf_ring *br);
struct mbuf* drbr_dequeue_drv(if_t ifp, struct buf_ring *br);
int drbr_needs_enqueue_drv(if_t ifp, struct buf_ring *br);
int drbr_enqueue_drv(if_t ifp, struct buf_ring *br, struct mbuf *m);
/* TSO */
void if_hw_tsomax_common(if_t ifp, struct ifnet_hw_tsomax *);
int if_hw_tsomax_update(if_t ifp, struct ifnet_hw_tsomax *);
#ifdef DEVICE_POLLING
enum poll_cmd { POLL_ONLY, POLL_AND_CHECK_STATUS };
typedef int poll_handler_t(if_t ifp, enum poll_cmd cmd, int count);
int ether_poll_register(poll_handler_t *h, if_t ifp);
int ether_poll_deregister(if_t ifp);
#endif /* DEVICE_POLLING */
#endif /* _KERNEL */
#include <net/ifq.h> /* XXXAO: temporary unconditional include */
#endif /* !_NET_IF_VAR_H_ */
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