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if.c
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if.c
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/* $NetBSD: if.c,v 1.529 2023/02/24 11:02:45 riastradh Exp $ */
/*-
* Copyright (c) 1999, 2000, 2001, 2008 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) 1995, 1996, 1997, and 1998 WIDE Project.
* 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 project 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 PROJECT 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 PROJECT 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) 1980, 1986, 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.c 8.5 (Berkeley) 1/9/95
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: if.c,v 1.529 2023/02/24 11:02:45 riastradh Exp $");
#if defined(_KERNEL_OPT)
#include "opt_inet.h"
#include "opt_ipsec.h"
#include "opt_atalk.h"
#include "opt_wlan.h"
#include "opt_net_mpsafe.h"
#include "opt_mrouting.h"
#endif
#include <sys/param.h>
#include <sys/mbuf.h>
#include <sys/systm.h>
#include <sys/callout.h>
#include <sys/proc.h>
#include <sys/socket.h>
#include <sys/socketvar.h>
#include <sys/domain.h>
#include <sys/protosw.h>
#include <sys/kernel.h>
#include <sys/ioctl.h>
#include <sys/sysctl.h>
#include <sys/syslog.h>
#include <sys/kauth.h>
#include <sys/kmem.h>
#include <sys/xcall.h>
#include <sys/cpu.h>
#include <sys/intr.h>
#include <sys/module_hook.h>
#include <sys/compat_stub.h>
#include <sys/msan.h>
#include <sys/hook.h>
#include <net/if.h>
#include <net/if_dl.h>
#include <net/if_ether.h>
#include <net/if_media.h>
#include <net80211/ieee80211.h>
#include <net80211/ieee80211_ioctl.h>
#include <net/if_types.h>
#include <net/route.h>
#include <sys/module.h>
#ifdef NETATALK
#include <netatalk/at_extern.h>
#include <netatalk/at.h>
#endif
#include <net/pfil.h>
#include <netinet/in.h>
#include <netinet/in_var.h>
#include <netinet/ip_encap.h>
#include <net/bpf.h>
#ifdef INET6
#include <netinet6/in6_var.h>
#include <netinet6/nd6.h>
#endif
#include "ether.h"
#include "bridge.h"
#if NBRIDGE > 0
#include <net/if_bridgevar.h>
#endif
#include "carp.h"
#if NCARP > 0
#include <netinet/ip_carp.h>
#endif
#include <compat/sys/sockio.h>
MALLOC_DEFINE(M_IFADDR, "ifaddr", "interface address");
MALLOC_DEFINE(M_IFMADDR, "ether_multi", "link-level multicast address");
/*
* XXX reusing (ifp)->if_snd->ifq_lock rather than having another spin mutex
* for each ifnet. It doesn't matter because:
* - if IFEF_MPSAFE is enabled, if_snd isn't used and lock contentions on
* ifq_lock don't happen
* - if IFEF_MPSAFE is disabled, there is no lock contention on ifq_lock
* because if_snd, if_link_state_change and if_link_state_change_process
* are all called with KERNEL_LOCK
*/
#define IF_LINK_STATE_CHANGE_LOCK(ifp) \
mutex_enter((ifp)->if_snd.ifq_lock)
#define IF_LINK_STATE_CHANGE_UNLOCK(ifp) \
mutex_exit((ifp)->if_snd.ifq_lock)
/*
* Global list of interfaces.
*/
/* DEPRECATED. Remove it once kvm(3) users disappeared */
struct ifnet_head ifnet_list;
struct pslist_head ifnet_pslist;
static ifnet_t ** ifindex2ifnet = NULL;
static u_int if_index = 1;
static size_t if_indexlim = 0;
static uint64_t index_gen;
/* Mutex to protect the above objects. */
kmutex_t ifnet_mtx __cacheline_aligned;
static struct psref_class *ifnet_psref_class __read_mostly;
static pserialize_t ifnet_psz;
static struct workqueue *ifnet_link_state_wq __read_mostly;
static struct workqueue *if_slowtimo_wq __read_mostly;
static kmutex_t if_clone_mtx;
struct ifnet *lo0ifp;
int ifqmaxlen = IFQ_MAXLEN;
struct psref_class *ifa_psref_class __read_mostly;
static int if_delroute_matcher(struct rtentry *, void *);
static bool if_is_unit(const char *);
static struct if_clone *if_clone_lookup(const char *, int *);
static LIST_HEAD(, if_clone) if_cloners = LIST_HEAD_INITIALIZER(if_cloners);
static int if_cloners_count;
/* Packet filtering hook for interfaces. */
pfil_head_t * if_pfil __read_mostly;
static kauth_listener_t if_listener;
static int doifioctl(struct socket *, u_long, void *, struct lwp *);
static void sysctl_sndq_setup(struct sysctllog **, const char *,
struct ifaltq *);
static void if_slowtimo_intr(void *);
static void if_slowtimo_work(struct work *, void *);
static int sysctl_if_watchdog(SYSCTLFN_PROTO);
static void sysctl_watchdog_setup(struct ifnet *);
static void if_attachdomain1(struct ifnet *);
static int ifconf(u_long, void *);
static int if_transmit(struct ifnet *, struct mbuf *);
static int if_clone_create(const char *);
static int if_clone_destroy(const char *);
static void if_link_state_change_work(struct work *, void *);
static void if_up_locked(struct ifnet *);
static void _if_down(struct ifnet *);
static void if_down_deactivated(struct ifnet *);
struct if_percpuq {
struct ifnet *ipq_ifp;
void *ipq_si;
struct percpu *ipq_ifqs; /* struct ifqueue */
};
static struct mbuf *if_percpuq_dequeue(struct if_percpuq *);
static void if_percpuq_drops(void *, void *, struct cpu_info *);
static int sysctl_percpuq_drops_handler(SYSCTLFN_PROTO);
static void sysctl_percpuq_setup(struct sysctllog **, const char *,
struct if_percpuq *);
struct if_deferred_start {
struct ifnet *ids_ifp;
void (*ids_if_start)(struct ifnet *);
void *ids_si;
};
static void if_deferred_start_softint(void *);
static void if_deferred_start_common(struct ifnet *);
static void if_deferred_start_destroy(struct ifnet *);
struct if_slowtimo_data {
kmutex_t isd_lock;
struct callout isd_ch;
struct work isd_work;
struct ifnet *isd_ifp;
bool isd_queued;
bool isd_dying;
bool isd_trigger;
};
/*
* Hook for if_vlan - needed by if_agr
*/
struct if_vlan_vlan_input_hook_t if_vlan_vlan_input_hook;
static void if_sysctl_setup(struct sysctllog **);
static int
if_listener_cb(kauth_cred_t cred, kauth_action_t action, void *cookie,
void *arg0, void *arg1, void *arg2, void *arg3)
{
int result;
enum kauth_network_req req;
result = KAUTH_RESULT_DEFER;
req = (enum kauth_network_req)(uintptr_t)arg1;
if (action != KAUTH_NETWORK_INTERFACE)
return result;
if ((req == KAUTH_REQ_NETWORK_INTERFACE_GET) ||
(req == KAUTH_REQ_NETWORK_INTERFACE_SET))
result = KAUTH_RESULT_ALLOW;
return result;
}
/*
* Network interface utility routines.
*
* Routines with ifa_ifwith* names take sockaddr *'s as
* parameters.
*/
void
ifinit(void)
{
#if (defined(INET) || defined(INET6))
encapinit();
#endif
if_listener = kauth_listen_scope(KAUTH_SCOPE_NETWORK,
if_listener_cb, NULL);
/* interfaces are available, inform socket code */
ifioctl = doifioctl;
}
/*
* XXX Initialization before configure().
* XXX hack to get pfil_add_hook working in autoconf.
*/
void
ifinit1(void)
{
int error __diagused;
#ifdef NET_MPSAFE
printf("NET_MPSAFE enabled\n");
#endif
mutex_init(&if_clone_mtx, MUTEX_DEFAULT, IPL_NONE);
TAILQ_INIT(&ifnet_list);
mutex_init(&ifnet_mtx, MUTEX_DEFAULT, IPL_NONE);
ifnet_psz = pserialize_create();
ifnet_psref_class = psref_class_create("ifnet", IPL_SOFTNET);
ifa_psref_class = psref_class_create("ifa", IPL_SOFTNET);
error = workqueue_create(&ifnet_link_state_wq, "iflnkst",
if_link_state_change_work, NULL, PRI_SOFTNET, IPL_NET,
WQ_MPSAFE);
KASSERT(error == 0);
PSLIST_INIT(&ifnet_pslist);
error = workqueue_create(&if_slowtimo_wq, "ifwdog",
if_slowtimo_work, NULL, PRI_SOFTNET, IPL_SOFTCLOCK, WQ_MPSAFE);
KASSERTMSG(error == 0, "error=%d", error);
if_indexlim = 8;
if_pfil = pfil_head_create(PFIL_TYPE_IFNET, NULL);
KASSERT(if_pfil != NULL);
#if NETHER > 0 || defined(NETATALK) || defined(WLAN)
etherinit();
#endif
}
/* XXX must be after domaininit() */
void
ifinit_post(void)
{
if_sysctl_setup(NULL);
}
ifnet_t *
if_alloc(u_char type)
{
return kmem_zalloc(sizeof(ifnet_t), KM_SLEEP);
}
void
if_free(ifnet_t *ifp)
{
kmem_free(ifp, sizeof(ifnet_t));
}
void
if_initname(struct ifnet *ifp, const char *name, int unit)
{
(void)snprintf(ifp->if_xname, sizeof(ifp->if_xname),
"%s%d", name, unit);
}
/*
* Null routines used while an interface is going away. These routines
* just return an error.
*/
int
if_nulloutput(struct ifnet *ifp, struct mbuf *m,
const struct sockaddr *so, const struct rtentry *rt)
{
return ENXIO;
}
void
if_nullinput(struct ifnet *ifp, struct mbuf *m)
{
/* Nothing. */
}
void
if_nullstart(struct ifnet *ifp)
{
/* Nothing. */
}
int
if_nulltransmit(struct ifnet *ifp, struct mbuf *m)
{
m_freem(m);
return ENXIO;
}
int
if_nullioctl(struct ifnet *ifp, u_long cmd, void *data)
{
return ENXIO;
}
int
if_nullinit(struct ifnet *ifp)
{
return ENXIO;
}
void
if_nullstop(struct ifnet *ifp, int disable)
{
/* Nothing. */
}
void
if_nullslowtimo(struct ifnet *ifp)
{
/* Nothing. */
}
void
if_nulldrain(struct ifnet *ifp)
{
/* Nothing. */
}
void
if_set_sadl(struct ifnet *ifp, const void *lla, u_char addrlen, bool factory)
{
struct ifaddr *ifa;
struct sockaddr_dl *sdl;
ifp->if_addrlen = addrlen;
if_alloc_sadl(ifp);
ifa = ifp->if_dl;
sdl = satosdl(ifa->ifa_addr);
(void)sockaddr_dl_setaddr(sdl, sdl->sdl_len, lla, ifp->if_addrlen);
if (factory) {
KASSERT(ifp->if_hwdl == NULL);
ifp->if_hwdl = ifp->if_dl;
ifaref(ifp->if_hwdl);
}
/* TBD routing socket */
}
struct ifaddr *
if_dl_create(const struct ifnet *ifp, const struct sockaddr_dl **sdlp)
{
unsigned socksize, ifasize;
int addrlen, namelen;
struct sockaddr_dl *mask, *sdl;
struct ifaddr *ifa;
namelen = strlen(ifp->if_xname);
addrlen = ifp->if_addrlen;
socksize = roundup(sockaddr_dl_measure(namelen, addrlen),
sizeof(long));
ifasize = sizeof(*ifa) + 2 * socksize;
ifa = malloc(ifasize, M_IFADDR, M_WAITOK | M_ZERO);
sdl = (struct sockaddr_dl *)(ifa + 1);
mask = (struct sockaddr_dl *)(socksize + (char *)sdl);
sockaddr_dl_init(sdl, socksize, ifp->if_index, ifp->if_type,
ifp->if_xname, namelen, NULL, addrlen);
mask->sdl_family = AF_LINK;
mask->sdl_len = sockaddr_dl_measure(namelen, 0);
memset(&mask->sdl_data[0], 0xff, namelen);
ifa->ifa_rtrequest = link_rtrequest;
ifa->ifa_addr = (struct sockaddr *)sdl;
ifa->ifa_netmask = (struct sockaddr *)mask;
ifa_psref_init(ifa);
*sdlp = sdl;
return ifa;
}
static void
if_sadl_setrefs(struct ifnet *ifp, struct ifaddr *ifa)
{
const struct sockaddr_dl *sdl;
ifp->if_dl = ifa;
ifaref(ifa);
sdl = satosdl(ifa->ifa_addr);
ifp->if_sadl = sdl;
}
/*
* Allocate the link level name for the specified interface. This
* is an attachment helper. It must be called after ifp->if_addrlen
* is initialized, which may not be the case when if_attach() is
* called.
*/
void
if_alloc_sadl(struct ifnet *ifp)
{
struct ifaddr *ifa;
const struct sockaddr_dl *sdl;
/*
* If the interface already has a link name, release it
* now. This is useful for interfaces that can change
* link types, and thus switch link names often.
*/
if (ifp->if_sadl != NULL)
if_free_sadl(ifp, 0);
ifa = if_dl_create(ifp, &sdl);
ifa_insert(ifp, ifa);
if_sadl_setrefs(ifp, ifa);
}
static void
if_deactivate_sadl(struct ifnet *ifp)
{
struct ifaddr *ifa;
KASSERT(ifp->if_dl != NULL);
ifa = ifp->if_dl;
ifp->if_sadl = NULL;
ifp->if_dl = NULL;
ifafree(ifa);
}
static void
if_replace_sadl(struct ifnet *ifp, struct ifaddr *ifa)
{
struct ifaddr *old;
KASSERT(ifp->if_dl != NULL);
old = ifp->if_dl;
ifaref(ifa);
/* XXX Update if_dl and if_sadl atomically */
ifp->if_dl = ifa;
ifp->if_sadl = satosdl(ifa->ifa_addr);
ifafree(old);
}
void
if_activate_sadl(struct ifnet *ifp, struct ifaddr *ifa0,
const struct sockaddr_dl *sdl)
{
struct ifaddr *ifa;
const int bound = curlwp_bind();
KASSERT(ifa_held(ifa0));
const int s = splsoftnet();
if_replace_sadl(ifp, ifa0);
int ss = pserialize_read_enter();
IFADDR_READER_FOREACH(ifa, ifp) {
struct psref psref;
ifa_acquire(ifa, &psref);
pserialize_read_exit(ss);
rtinit(ifa, RTM_LLINFO_UPD, 0);
ss = pserialize_read_enter();
ifa_release(ifa, &psref);
}
pserialize_read_exit(ss);
splx(s);
curlwp_bindx(bound);
}
/*
* Free the link level name for the specified interface. This is
* a detach helper. This is called from if_detach().
*/
void
if_free_sadl(struct ifnet *ifp, int factory)
{
struct ifaddr *ifa;
if (factory && ifp->if_hwdl != NULL) {
ifa = ifp->if_hwdl;
ifp->if_hwdl = NULL;
ifafree(ifa);
}
ifa = ifp->if_dl;
if (ifa == NULL) {
KASSERT(ifp->if_sadl == NULL);
return;
}
KASSERT(ifp->if_sadl != NULL);
const int s = splsoftnet();
KASSERT(ifa->ifa_addr->sa_family == AF_LINK);
ifa_remove(ifp, ifa);
if_deactivate_sadl(ifp);
splx(s);
}
static void
if_getindex(ifnet_t *ifp)
{
bool hitlimit = false;
char xnamebuf[HOOKNAMSIZ];
ifp->if_index_gen = index_gen++;
snprintf(xnamebuf, sizeof(xnamebuf), "%s-lshk", ifp->if_xname);
ifp->if_linkstate_hooks = simplehook_create(IPL_NET,
xnamebuf);
ifp->if_index = if_index;
if (ifindex2ifnet == NULL) {
if_index++;
goto skip;
}
while (if_byindex(ifp->if_index)) {
/*
* If we hit USHRT_MAX, we skip back to 0 since
* there are a number of places where the value
* of if_index or if_index itself is compared
* to or stored in an unsigned short. By
* jumping back, we won't botch those assignments
* or comparisons.
*/
if (++if_index == 0) {
if_index = 1;
} else if (if_index == USHRT_MAX) {
/*
* However, if we have to jump back to
* zero *twice* without finding an empty
* slot in ifindex2ifnet[], then there
* there are too many (>65535) interfaces.
*/
if (hitlimit)
panic("too many interfaces");
hitlimit = true;
if_index = 1;
}
ifp->if_index = if_index;
}
skip:
/*
* ifindex2ifnet is indexed by if_index. Since if_index will
* grow dynamically, it should grow too.
*/
if (ifindex2ifnet == NULL || ifp->if_index >= if_indexlim) {
size_t m, n, oldlim;
void *q;
oldlim = if_indexlim;
while (ifp->if_index >= if_indexlim)
if_indexlim <<= 1;
/* grow ifindex2ifnet */
m = oldlim * sizeof(struct ifnet *);
n = if_indexlim * sizeof(struct ifnet *);
q = malloc(n, M_IFADDR, M_WAITOK | M_ZERO);
if (ifindex2ifnet != NULL) {
memcpy(q, ifindex2ifnet, m);
free(ifindex2ifnet, M_IFADDR);
}
ifindex2ifnet = (struct ifnet **)q;
}
ifindex2ifnet[ifp->if_index] = ifp;
}
/*
* Initialize an interface and assign an index for it.
*
* It must be called prior to a device specific attach routine
* (e.g., ether_ifattach and ieee80211_ifattach) or if_alloc_sadl,
* and be followed by if_register:
*
* if_initialize(ifp);
* ether_ifattach(ifp, enaddr);
* if_register(ifp);
*/
void
if_initialize(ifnet_t *ifp)
{
KASSERT(if_indexlim > 0);
TAILQ_INIT(&ifp->if_addrlist);
/*
* Link level name is allocated later by a separate call to
* if_alloc_sadl().
*/
if (ifp->if_snd.ifq_maxlen == 0)
ifp->if_snd.ifq_maxlen = ifqmaxlen;
ifp->if_broadcastaddr = 0; /* reliably crash if used uninitialized */
ifp->if_link_state = LINK_STATE_UNKNOWN;
ifp->if_link_queue = -1; /* all bits set, see link_state_change() */
ifp->if_link_scheduled = false;
ifp->if_capenable = 0;
ifp->if_csum_flags_tx = 0;
ifp->if_csum_flags_rx = 0;
#ifdef ALTQ
ifp->if_snd.altq_type = 0;
ifp->if_snd.altq_disc = NULL;
ifp->if_snd.altq_flags &= ALTQF_CANTCHANGE;
ifp->if_snd.altq_tbr = NULL;
ifp->if_snd.altq_ifp = ifp;
#endif
IFQ_LOCK_INIT(&ifp->if_snd);
ifp->if_pfil = pfil_head_create(PFIL_TYPE_IFNET, ifp);
pfil_run_ifhooks(if_pfil, PFIL_IFNET_ATTACH, ifp);
IF_AFDATA_LOCK_INIT(ifp);
PSLIST_ENTRY_INIT(ifp, if_pslist_entry);
PSLIST_INIT(&ifp->if_addr_pslist);
psref_target_init(&ifp->if_psref, ifnet_psref_class);
ifp->if_ioctl_lock = mutex_obj_alloc(MUTEX_DEFAULT, IPL_NONE);
LIST_INIT(&ifp->if_multiaddrs);
if_stats_init(ifp);
IFNET_GLOBAL_LOCK();
if_getindex(ifp);
IFNET_GLOBAL_UNLOCK();
}
/*
* Register an interface to the list of "active" interfaces.
*/
void
if_register(ifnet_t *ifp)
{
/*
* If the driver has not supplied its own if_ioctl or if_stop,
* then supply the default.
*/
if (ifp->if_ioctl == NULL)
ifp->if_ioctl = ifioctl_common;
if (ifp->if_stop == NULL)
ifp->if_stop = if_nullstop;
sysctl_sndq_setup(&ifp->if_sysctl_log, ifp->if_xname, &ifp->if_snd);
if (!STAILQ_EMPTY(&domains))
if_attachdomain1(ifp);
/* Announce the interface. */
rt_ifannouncemsg(ifp, IFAN_ARRIVAL);
if (ifp->if_slowtimo != NULL) {
struct if_slowtimo_data *isd;
isd = kmem_zalloc(sizeof(*isd), KM_SLEEP);
mutex_init(&isd->isd_lock, MUTEX_DEFAULT, IPL_SOFTCLOCK);
callout_init(&isd->isd_ch, CALLOUT_MPSAFE);
callout_setfunc(&isd->isd_ch, if_slowtimo_intr, ifp);
isd->isd_ifp = ifp;
ifp->if_slowtimo_data = isd;
if_slowtimo_intr(ifp);
sysctl_watchdog_setup(ifp);
}
if (ifp->if_transmit == NULL || ifp->if_transmit == if_nulltransmit)
ifp->if_transmit = if_transmit;
IFNET_GLOBAL_LOCK();
TAILQ_INSERT_TAIL(&ifnet_list, ifp, if_list);
IFNET_WRITER_INSERT_TAIL(ifp);
IFNET_GLOBAL_UNLOCK();
}
/*
* The if_percpuq framework
*
* It allows network device drivers to execute the network stack
* in softint (so called softint-based if_input). It utilizes
* softint and percpu ifqueue. It doesn't distribute any packets
* between CPUs, unlike pktqueue(9).
*
* Currently we support two options for device drivers to apply the framework:
* - Use it implicitly with less changes
* - If you use if_attach in driver's _attach function and if_input in
* driver's Rx interrupt handler, a packet is queued and a softint handles
* the packet implicitly
* - Use it explicitly in each driver (recommended)
* - You can use if_percpuq_* directly in your driver
* - In this case, you need to allocate struct if_percpuq in driver's softc
* - See wm(4) as a reference implementation
*/
static void
if_percpuq_softint(void *arg)
{
struct if_percpuq *ipq = arg;
struct ifnet *ifp = ipq->ipq_ifp;
struct mbuf *m;
while ((m = if_percpuq_dequeue(ipq)) != NULL) {
if_statinc(ifp, if_ipackets);
bpf_mtap(ifp, m, BPF_D_IN);
ifp->_if_input(ifp, m);
}
}
static void
if_percpuq_init_ifq(void *p, void *arg __unused, struct cpu_info *ci __unused)
{
struct ifqueue *const ifq = p;
memset(ifq, 0, sizeof(*ifq));
ifq->ifq_maxlen = IFQ_MAXLEN;
}
struct if_percpuq *
if_percpuq_create(struct ifnet *ifp)
{
struct if_percpuq *ipq;
u_int flags = SOFTINT_NET;
flags |= if_is_mpsafe(ifp) ? SOFTINT_MPSAFE : 0;
ipq = kmem_zalloc(sizeof(*ipq), KM_SLEEP);
ipq->ipq_ifp = ifp;
ipq->ipq_si = softint_establish(flags, if_percpuq_softint, ipq);
ipq->ipq_ifqs = percpu_alloc(sizeof(struct ifqueue));
percpu_foreach(ipq->ipq_ifqs, &if_percpuq_init_ifq, NULL);
sysctl_percpuq_setup(&ifp->if_sysctl_log, ifp->if_xname, ipq);
return ipq;
}
static struct mbuf *
if_percpuq_dequeue(struct if_percpuq *ipq)
{
struct mbuf *m;
struct ifqueue *ifq;
const int s = splnet();
ifq = percpu_getref(ipq->ipq_ifqs);
IF_DEQUEUE(ifq, m);
percpu_putref(ipq->ipq_ifqs);
splx(s);
return m;
}
static void
if_percpuq_purge_ifq(void *p, void *arg __unused, struct cpu_info *ci __unused)
{
struct ifqueue *const ifq = p;
IF_PURGE(ifq);
}
void
if_percpuq_destroy(struct if_percpuq *ipq)
{
/* if_detach may already destroy it */
if (ipq == NULL)
return;
softint_disestablish(ipq->ipq_si);
percpu_foreach(ipq->ipq_ifqs, &if_percpuq_purge_ifq, NULL);
percpu_free(ipq->ipq_ifqs, sizeof(struct ifqueue));
kmem_free(ipq, sizeof(*ipq));
}
void
if_percpuq_enqueue(struct if_percpuq *ipq, struct mbuf *m)
{
struct ifqueue *ifq;
KASSERT(ipq != NULL);
const int s = splnet();
ifq = percpu_getref(ipq->ipq_ifqs);
if (IF_QFULL(ifq)) {
IF_DROP(ifq);
percpu_putref(ipq->ipq_ifqs);
m_freem(m);
goto out;
}
IF_ENQUEUE(ifq, m);
percpu_putref(ipq->ipq_ifqs);
softint_schedule(ipq->ipq_si);
out:
splx(s);
}
static void
if_percpuq_drops(void *p, void *arg, struct cpu_info *ci __unused)
{
struct ifqueue *const ifq = p;
uint64_t *sum = arg;
*sum += ifq->ifq_drops;
}
static int
sysctl_percpuq_drops_handler(SYSCTLFN_ARGS)
{
struct sysctlnode node;
struct if_percpuq *ipq;
uint64_t sum = 0;
int error;
node = *rnode;
ipq = node.sysctl_data;
percpu_foreach(ipq->ipq_ifqs, if_percpuq_drops, &sum);
node.sysctl_data = ∑
error = sysctl_lookup(SYSCTLFN_CALL(&node));
if (error != 0 || newp == NULL)
return error;
return 0;
}
static void
sysctl_percpuq_setup(struct sysctllog **clog, const char* ifname,
struct if_percpuq *ipq)
{
const struct sysctlnode *cnode, *rnode;
if (sysctl_createv(clog, 0, NULL, &rnode,
CTLFLAG_PERMANENT,
CTLTYPE_NODE, "interfaces",
SYSCTL_DESCR("Per-interface controls"),
NULL, 0, NULL, 0,
CTL_NET, CTL_CREATE, CTL_EOL) != 0)
goto bad;
if (sysctl_createv(clog, 0, &rnode, &rnode,
CTLFLAG_PERMANENT,
CTLTYPE_NODE, ifname,
SYSCTL_DESCR("Interface controls"),
NULL, 0, NULL, 0,
CTL_CREATE, CTL_EOL) != 0)
goto bad;
if (sysctl_createv(clog, 0, &rnode, &rnode,
CTLFLAG_PERMANENT,
CTLTYPE_NODE, "rcvq",
SYSCTL_DESCR("Interface input queue controls"),
NULL, 0, NULL, 0,
CTL_CREATE, CTL_EOL) != 0)
goto bad;