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freebsd-dev/sys/net/if.c
Xin LI b0b4b28bf1 Validate ifc->ifc_len before submitting its incarnation to sbuf_new, 
which will finally lead to kernel panic.

Security:	This prevents a local (root-launched) DoS
Submitted by:	Wojciech A. Koszek [dunstan at freebsd czest pl]
PR:		77421
MFC After:	1 week
2005-02-12 17:51:12 +00:00

2018 lines
47 KiB
C
Raw Blame History

/*-
* 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.
* 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.
*
* @(#)if.c 8.5 (Berkeley) 1/9/95
* $FreeBSD$
*/
#include "opt_compat.h"
#include "opt_inet6.h"
#include "opt_inet.h"
#include "opt_mac.h"
#include <sys/param.h>
#include <sys/types.h>
#include <sys/conf.h>
#include <sys/mac.h>
#include <sys/malloc.h>
#include <sys/sbuf.h>
#include <sys/bus.h>
#include <sys/mbuf.h>
#include <sys/systm.h>
#include <sys/proc.h>
#include <sys/socket.h>
#include <sys/socketvar.h>
#include <sys/protosw.h>
#include <sys/kernel.h>
#include <sys/sockio.h>
#include <sys/syslog.h>
#include <sys/sysctl.h>
#include <sys/taskqueue.h>
#include <sys/domain.h>
#include <sys/jail.h>
#include <machine/stdarg.h>
#include <net/if.h>
#include <net/if_arp.h>
#include <net/if_clone.h>
#include <net/if_dl.h>
#include <net/if_types.h>
#include <net/if_var.h>
#include <net/radix.h>
#include <net/route.h>
#if defined(INET) || defined(INET6)
/*XXX*/
#include <netinet/in.h>
#include <netinet/in_var.h>
#ifdef INET6
#include <netinet6/in6_var.h>
#include <netinet6/in6_ifattach.h>
#endif
#endif
#ifdef INET
#include <netinet/if_ether.h>
#endif
void (*ng_ether_link_state_p)(struct ifnet *ifp, int state);
struct mbuf *(*tbr_dequeue_ptr)(struct ifaltq *, int) = NULL;
static void if_attachdomain(void *);
static void if_attachdomain1(struct ifnet *);
static int ifconf(u_long, caddr_t);
static void if_grow(void);
static void if_init(void *);
static void if_check(void *);
static int if_findindex(struct ifnet *);
static void if_qflush(struct ifaltq *);
static void if_route(struct ifnet *, int flag, int fam);
static void if_slowtimo(void *);
static void if_unroute(struct ifnet *, int flag, int fam);
static void link_rtrequest(int, struct rtentry *, struct rt_addrinfo *);
static int if_rtdel(struct radix_node *, void *);
static int ifhwioctl(u_long, struct ifnet *, caddr_t, struct thread *);
static void if_start_deferred(void *context, int pending);
#ifdef INET6
/*
* XXX: declare here to avoid to include many inet6 related files..
* should be more generalized?
*/
extern void nd6_setmtu(struct ifnet *);
#endif
int if_index = 0;
struct ifindex_entry *ifindex_table = NULL;
int ifqmaxlen = IFQ_MAXLEN;
struct ifnethead ifnet; /* depend on static init XXX */
struct mtx ifnet_lock;
static int if_indexlim = 8;
static struct knlist ifklist;
static void filt_netdetach(struct knote *kn);
static int filt_netdev(struct knote *kn, long hint);
static struct filterops netdev_filtops =
{ 1, NULL, filt_netdetach, filt_netdev };
/*
* System initialization
*/
SYSINIT(interfaces, SI_SUB_INIT_IF, SI_ORDER_FIRST, if_init, NULL)
SYSINIT(interface_check, SI_SUB_PROTO_IF, SI_ORDER_FIRST, if_check, NULL)
MALLOC_DEFINE(M_IFADDR, "ifaddr", "interface address");
MALLOC_DEFINE(M_IFMADDR, "ether_multi", "link-level multicast address");
static d_open_t netopen;
static d_close_t netclose;
static d_ioctl_t netioctl;
static d_kqfilter_t netkqfilter;
static struct cdevsw net_cdevsw = {
.d_version = D_VERSION,
.d_flags = D_NEEDGIANT,
.d_open = netopen,
.d_close = netclose,
.d_ioctl = netioctl,
.d_name = "net",
.d_kqfilter = netkqfilter,
};
static int
netopen(struct cdev *dev, int flag, int mode, struct thread *td)
{
return (0);
}
static int
netclose(struct cdev *dev, int flags, int fmt, struct thread *td)
{
return (0);
}
static int
netioctl(struct cdev *dev, u_long cmd, caddr_t data, int flag, struct thread *td)
{
struct ifnet *ifp;
int error, idx;
/* only support interface specific ioctls */
if (IOCGROUP(cmd) != 'i')
return (EOPNOTSUPP);
idx = minor(dev);
if (idx == 0) {
/*
* special network device, not interface.
*/
if (cmd == SIOCGIFCONF)
return (ifconf(cmd, data)); /* XXX remove cmd */
return (EOPNOTSUPP);
}
ifp = ifnet_byindex(idx);
if (ifp == NULL)
return (ENXIO);
error = ifhwioctl(cmd, ifp, data, td);
if (error == ENOIOCTL)
error = EOPNOTSUPP;
return (error);
}
static int
netkqfilter(struct cdev *dev, struct knote *kn)
{
struct knlist *klist;
struct ifnet *ifp;
int idx;
switch (kn->kn_filter) {
case EVFILT_NETDEV:
kn->kn_fop = &netdev_filtops;
break;
default:
return (1);
}
idx = minor(dev);
if (idx == 0) {
klist = &ifklist;
} else {
ifp = ifnet_byindex(idx);
if (ifp == NULL)
return (1);
klist = &ifp->if_klist;
}
kn->kn_hook = (caddr_t)klist;
knlist_add(klist, kn, 0);
return (0);
}
static void
filt_netdetach(struct knote *kn)
{
struct knlist *klist = (struct knlist *)kn->kn_hook;
knlist_remove(klist, kn, 0);
}
static int
filt_netdev(struct knote *kn, long hint)
{
struct knlist *klist = (struct knlist *)kn->kn_hook;
/*
* Currently NOTE_EXIT is abused to indicate device detach.
*/
if (hint == NOTE_EXIT) {
kn->kn_data = NOTE_LINKINV;
kn->kn_flags |= (EV_EOF | EV_ONESHOT);
knlist_remove_inevent(klist, kn);
return (1);
}
if (hint != 0)
kn->kn_data = hint; /* current status */
if (kn->kn_sfflags & hint)
kn->kn_fflags |= hint;
return (kn->kn_fflags != 0);
}
/*
* Network interface utility routines.
*
* Routines with ifa_ifwith* names take sockaddr *'s as
* parameters.
*/
/* ARGSUSED*/
static void
if_init(void *dummy __unused)
{
IFNET_LOCK_INIT();
TAILQ_INIT(&ifnet);
knlist_init(&ifklist, NULL);
if_grow(); /* create initial table */
ifdev_byindex(0) = make_dev(&net_cdevsw, 0,
UID_ROOT, GID_WHEEL, 0600, "network");
if_clone_init();
}
static void
if_grow(void)
{
u_int n;
struct ifindex_entry *e;
if_indexlim <<= 1;
n = if_indexlim * sizeof(*e);
e = malloc(n, M_IFADDR, M_WAITOK | M_ZERO);
if (ifindex_table != NULL) {
memcpy((caddr_t)e, (caddr_t)ifindex_table, n/2);
free((caddr_t)ifindex_table, M_IFADDR);
}
ifindex_table = e;
}
/* ARGSUSED*/
static void
if_check(void *dummy __unused)
{
struct ifnet *ifp;
int s;
s = splimp();
IFNET_RLOCK(); /* could sleep on rare error; mostly okay XXX */
TAILQ_FOREACH(ifp, &ifnet, if_link) {
if (ifp->if_snd.ifq_maxlen == 0) {
if_printf(ifp, "XXX: driver didn't set ifq_maxlen\n");
ifp->if_snd.ifq_maxlen = ifqmaxlen;
}
if (!mtx_initialized(&ifp->if_snd.ifq_mtx)) {
if_printf(ifp,
"XXX: driver didn't initialize queue mtx\n");
mtx_init(&ifp->if_snd.ifq_mtx, "unknown",
MTX_NETWORK_LOCK, MTX_DEF);
}
}
IFNET_RUNLOCK();
splx(s);
if_slowtimo(0);
}
static int
if_findindex(struct ifnet *ifp)
{
int i, unit;
char eaddr[18], devname[32];
const char *name, *p;
switch (ifp->if_type) {
case IFT_ETHER: /* these types use struct arpcom */
case IFT_FDDI:
case IFT_XETHER:
case IFT_ISO88025:
case IFT_L2VLAN:
snprintf(eaddr, 18, "%6D", IFP2AC(ifp)->ac_enaddr, ":");
break;
default:
eaddr[0] = '\0';
break;
}
strlcpy(devname, ifp->if_xname, sizeof(devname));
name = net_cdevsw.d_name;
i = 0;
while ((resource_find_dev(&i, name, &unit, NULL, NULL)) == 0) {
if (resource_string_value(name, unit, "ether", &p) == 0)
if (strcmp(p, eaddr) == 0)
goto found;
if (resource_string_value(name, unit, "dev", &p) == 0)
if (strcmp(p, devname) == 0)
goto found;
}
unit = 0;
found:
if (unit != 0) {
if (ifaddr_byindex(unit) == NULL)
return (unit);
printf("%s%d in use, cannot hardwire it to %s.\n",
name, unit, devname);
}
for (unit = 1; ; unit++) {
if (unit <= if_index && ifaddr_byindex(unit) != NULL)
continue;
if (resource_string_value(name, unit, "ether", &p) == 0 ||
resource_string_value(name, unit, "dev", &p) == 0)
continue;
break;
}
return (unit);
}
/*
* Attach an interface to the
* list of "active" interfaces.
*/
void
if_attach(struct ifnet *ifp)
{
unsigned socksize, ifasize;
int namelen, masklen;
struct sockaddr_dl *sdl;
struct ifaddr *ifa;
TASK_INIT(&ifp->if_starttask, 0, if_start_deferred, ifp);
IF_AFDATA_LOCK_INIT(ifp);
ifp->if_afdata_initialized = 0;
IFNET_WLOCK();
TAILQ_INSERT_TAIL(&ifnet, ifp, if_link);
IFNET_WUNLOCK();
/*
* XXX -
* The old code would work if the interface passed a pre-existing
* chain of ifaddrs to this code. We don't trust our callers to
* properly initialize the tailq, however, so we no longer allow
* this unlikely case.
*/
TAILQ_INIT(&ifp->if_addrhead);
TAILQ_INIT(&ifp->if_prefixhead);
TAILQ_INIT(&ifp->if_multiaddrs);
knlist_init(&ifp->if_klist, NULL);
getmicrotime(&ifp->if_lastchange);
ifp->if_data.ifi_epoch = time_second;
#ifdef MAC
mac_init_ifnet(ifp);
mac_create_ifnet(ifp);
#endif
ifp->if_index = if_findindex(ifp);
if (ifp->if_index > if_index)
if_index = ifp->if_index;
if (if_index >= if_indexlim)
if_grow();
ifp->if_data.ifi_datalen = sizeof(struct if_data);
ifnet_byindex(ifp->if_index) = ifp;
ifdev_byindex(ifp->if_index) = make_dev(&net_cdevsw,
unit2minor(ifp->if_index),
UID_ROOT, GID_WHEEL, 0600, "%s/%s",
net_cdevsw.d_name, ifp->if_xname);
make_dev_alias(ifdev_byindex(ifp->if_index), "%s%d",
net_cdevsw.d_name, ifp->if_index);
mtx_init(&ifp->if_snd.ifq_mtx, ifp->if_xname, "if send queue", MTX_DEF);
/*
* create a Link Level name for this device
*/
namelen = strlen(ifp->if_xname);
/*
* Always save enough space for any possiable name so we can do
* a rename in place later.
*/
masklen = offsetof(struct sockaddr_dl, sdl_data[0]) + IFNAMSIZ;
socksize = masklen + ifp->if_addrlen;
if (socksize < sizeof(*sdl))
socksize = sizeof(*sdl);
socksize = roundup2(socksize, sizeof(long));
ifasize = sizeof(*ifa) + 2 * socksize;
ifa = malloc(ifasize, M_IFADDR, M_WAITOK | M_ZERO);
IFA_LOCK_INIT(ifa);
sdl = (struct sockaddr_dl *)(ifa + 1);
sdl->sdl_len = socksize;
sdl->sdl_family = AF_LINK;
bcopy(ifp->if_xname, sdl->sdl_data, namelen);
sdl->sdl_nlen = namelen;
sdl->sdl_index = ifp->if_index;
sdl->sdl_type = ifp->if_type;
ifaddr_byindex(ifp->if_index) = ifa;
ifa->ifa_ifp = ifp;
ifa->ifa_rtrequest = link_rtrequest;
ifa->ifa_addr = (struct sockaddr *)sdl;
sdl = (struct sockaddr_dl *)(socksize + (caddr_t)sdl);
ifa->ifa_netmask = (struct sockaddr *)sdl;
sdl->sdl_len = masklen;
while (namelen != 0)
sdl->sdl_data[--namelen] = 0xff;
ifa->ifa_refcnt = 1;
TAILQ_INSERT_HEAD(&ifp->if_addrhead, ifa, ifa_link);
ifp->if_broadcastaddr = NULL; /* reliably crash if used uninitialized */
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;
if (domain_init_status >= 2)
if_attachdomain1(ifp);
EVENTHANDLER_INVOKE(ifnet_arrival_event, ifp);
/* Announce the interface. */
rt_ifannouncemsg(ifp, IFAN_ARRIVAL);
}
static void
if_attachdomain(void *dummy)
{
struct ifnet *ifp;
int s;
s = splnet();
TAILQ_FOREACH(ifp, &ifnet, if_link)
if_attachdomain1(ifp);
splx(s);
}
SYSINIT(domainifattach, SI_SUB_PROTO_IFATTACHDOMAIN, SI_ORDER_SECOND,
if_attachdomain, NULL);
static void
if_attachdomain1(struct ifnet *ifp)
{
struct domain *dp;
int s;
s = splnet();
/*
* Since dp->dom_ifattach calls malloc() with M_WAITOK, we
* cannot lock ifp->if_afdata initialization, entirely.
*/
if (IF_AFDATA_TRYLOCK(ifp) == 0) {
splx(s);
return;
}
if (ifp->if_afdata_initialized >= domain_init_status) {
IF_AFDATA_UNLOCK(ifp);
splx(s);
printf("if_attachdomain called more than once on %s\n",
ifp->if_xname);
return;
}
ifp->if_afdata_initialized = domain_init_status;
IF_AFDATA_UNLOCK(ifp);
/* address family dependent data region */
bzero(ifp->if_afdata, sizeof(ifp->if_afdata));
for (dp = domains; dp; dp = dp->dom_next) {
if (dp->dom_ifattach)
ifp->if_afdata[dp->dom_family] =
(*dp->dom_ifattach)(ifp);
}
splx(s);
}
/*
* Detach an interface, removing it from the
* list of "active" interfaces.
*/
void
if_detach(struct ifnet *ifp)
{
struct ifaddr *ifa, *next;
struct radix_node_head *rnh;
int s;
int i;
struct domain *dp;
struct ifnet *iter;
int found;
EVENTHANDLER_INVOKE(ifnet_departure_event, ifp);
/*
* Remove routes and flush queues.
*/
s = splnet();
if_down(ifp);
#ifdef ALTQ
if (ALTQ_IS_ENABLED(&ifp->if_snd))
altq_disable(&ifp->if_snd);
if (ALTQ_IS_ATTACHED(&ifp->if_snd))
altq_detach(&ifp->if_snd);
#endif
for (ifa = TAILQ_FIRST(&ifp->if_addrhead); ifa; ifa = next) {
next = TAILQ_NEXT(ifa, ifa_link);
if (ifa->ifa_addr->sa_family == AF_LINK)
continue;
#ifdef INET
/* XXX: Ugly!! ad hoc just for INET */
if (ifa->ifa_addr && ifa->ifa_addr->sa_family == AF_INET) {
struct ifaliasreq ifr;
bzero(&ifr, sizeof(ifr));
ifr.ifra_addr = *ifa->ifa_addr;
if (ifa->ifa_dstaddr)
ifr.ifra_broadaddr = *ifa->ifa_dstaddr;
if (in_control(NULL, SIOCDIFADDR, (caddr_t)&ifr, ifp,
NULL) == 0)
continue;
}
#endif /* INET */
#ifdef INET6
if (ifa->ifa_addr && ifa->ifa_addr->sa_family == AF_INET6) {
in6_purgeaddr(ifa);
/* ifp_addrhead is already updated */
continue;
}
#endif /* INET6 */
TAILQ_REMOVE(&ifp->if_addrhead, ifa, ifa_link);
IFAFREE(ifa);
}
#ifdef INET6
/*
* Remove all IPv6 kernel structs related to ifp. This should be done
* before removing routing entries below, since IPv6 interface direct
* routes are expected to be removed by the IPv6-specific kernel API.
* Otherwise, the kernel will detect some inconsistency and bark it.
*/
in6_ifdetach(ifp);
#endif
/*
* Remove address from ifindex_table[] and maybe decrement if_index.
* Clean up all addresses.
*/
ifnet_byindex(ifp->if_index) = NULL;
ifaddr_byindex(ifp->if_index) = NULL;
destroy_dev(ifdev_byindex(ifp->if_index));
ifdev_byindex(ifp->if_index) = NULL;
while (if_index > 0 && ifaddr_byindex(if_index) == NULL)
if_index--;
/* We can now free link ifaddr. */
if (!TAILQ_EMPTY(&ifp->if_addrhead)) {
ifa = TAILQ_FIRST(&ifp->if_addrhead);
TAILQ_REMOVE(&ifp->if_addrhead, ifa, ifa_link);
IFAFREE(ifa);
}
/*
* Delete all remaining routes using this interface
* Unfortuneatly the only way to do this is to slog through
* the entire routing table looking for routes which point
* to this interface...oh well...
*/
for (i = 1; i <= AF_MAX; i++) {
if ((rnh = rt_tables[i]) == NULL)
continue;
RADIX_NODE_HEAD_LOCK(rnh);
(void) rnh->rnh_walktree(rnh, if_rtdel, ifp);
RADIX_NODE_HEAD_UNLOCK(rnh);
}
/* Announce that the interface is gone. */
rt_ifannouncemsg(ifp, IFAN_DEPARTURE);
IF_AFDATA_LOCK(ifp);
for (dp = domains; dp; dp = dp->dom_next) {
if (dp->dom_ifdetach && ifp->if_afdata[dp->dom_family])
(*dp->dom_ifdetach)(ifp,
ifp->if_afdata[dp->dom_family]);
}
IF_AFDATA_UNLOCK(ifp);
#ifdef MAC
mac_destroy_ifnet(ifp);
#endif /* MAC */
KNOTE_UNLOCKED(&ifp->if_klist, NOTE_EXIT);
knlist_clear(&ifp->if_klist, 0);
knlist_destroy(&ifp->if_klist);
IFNET_WLOCK();
found = 0;
TAILQ_FOREACH(iter, &ifnet, if_link)
if (iter == ifp) {
found = 1;
break;
}
if (found)
TAILQ_REMOVE(&ifnet, ifp, if_link);
IFNET_WUNLOCK();
mtx_destroy(&ifp->if_snd.ifq_mtx);
IF_AFDATA_DESTROY(ifp);
splx(s);
}
/*
* Delete Routes for a Network Interface
*
* Called for each routing entry via the rnh->rnh_walktree() call above
* to delete all route entries referencing a detaching network interface.
*
* Arguments:
* rn pointer to node in the routing table
* arg argument passed to rnh->rnh_walktree() - detaching interface
*
* Returns:
* 0 successful
* errno failed - reason indicated
*
*/
static int
if_rtdel(struct radix_node *rn, void *arg)
{
struct rtentry *rt = (struct rtentry *)rn;
struct ifnet *ifp = arg;
int err;
if (rt->rt_ifp == ifp) {
/*
* Protect (sorta) against walktree recursion problems
* with cloned routes
*/
if ((rt->rt_flags & RTF_UP) == 0)
return (0);
err = rtrequest(RTM_DELETE, rt_key(rt), rt->rt_gateway,
rt_mask(rt), rt->rt_flags,
(struct rtentry **) NULL);
if (err) {
log(LOG_WARNING, "if_rtdel: error %d\n", err);
}
}
return (0);
}
#define equal(a1, a2) (bcmp((a1), (a2), ((a1))->sa_len) == 0)
/*
* Locate an interface based on a complete address.
*/
/*ARGSUSED*/
struct ifaddr *
ifa_ifwithaddr(struct sockaddr *addr)
{
struct ifnet *ifp;
struct ifaddr *ifa;
IFNET_RLOCK();
TAILQ_FOREACH(ifp, &ifnet, if_link)
TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
if (ifa->ifa_addr->sa_family != addr->sa_family)
continue;
if (equal(addr, ifa->ifa_addr))
goto done;
/* IP6 doesn't have broadcast */
if ((ifp->if_flags & IFF_BROADCAST) &&
ifa->ifa_broadaddr &&
ifa->ifa_broadaddr->sa_len != 0 &&
equal(ifa->ifa_broadaddr, addr))
goto done;
}
ifa = NULL;
done:
IFNET_RUNLOCK();
return (ifa);
}
/*
* Locate the point to point interface with a given destination address.
*/
/*ARGSUSED*/
struct ifaddr *
ifa_ifwithdstaddr(struct sockaddr *addr)
{
struct ifnet *ifp;
struct ifaddr *ifa;
IFNET_RLOCK();
TAILQ_FOREACH(ifp, &ifnet, if_link) {
if ((ifp->if_flags & IFF_POINTOPOINT) == 0)
continue;
TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
if (ifa->ifa_addr->sa_family != addr->sa_family)
continue;
if (ifa->ifa_dstaddr && equal(addr, ifa->ifa_dstaddr))
goto done;
}
}
ifa = NULL;
done:
IFNET_RUNLOCK();
return (ifa);
}
/*
* Find an interface on a specific network. If many, choice
* is most specific found.
*/
struct ifaddr *
ifa_ifwithnet(struct sockaddr *addr)
{
struct ifnet *ifp;
struct ifaddr *ifa;
struct ifaddr *ifa_maybe = (struct ifaddr *) 0;
u_int af = addr->sa_family;
char *addr_data = addr->sa_data, *cplim;
/*
* AF_LINK addresses can be looked up directly by their index number,
* so do that if we can.
*/
if (af == AF_LINK) {
struct sockaddr_dl *sdl = (struct sockaddr_dl *)addr;
if (sdl->sdl_index && sdl->sdl_index <= if_index)
return (ifaddr_byindex(sdl->sdl_index));
}
/*
* Scan though each interface, looking for ones that have
* addresses in this address family.
*/
IFNET_RLOCK();
TAILQ_FOREACH(ifp, &ifnet, if_link) {
TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
char *cp, *cp2, *cp3;
if (ifa->ifa_addr->sa_family != af)
next: continue;
if (af == AF_INET && ifp->if_flags & IFF_POINTOPOINT) {
/*
* This is a bit broken as it doesn't
* take into account that the remote end may
* be a single node in the network we are
* looking for.
* The trouble is that we don't know the
* netmask for the remote end.
*/
if (ifa->ifa_dstaddr != 0
&& equal(addr, ifa->ifa_dstaddr))
goto done;
} else {
/*
* if we have a special address handler,
* then use it instead of the generic one.
*/
if (ifa->ifa_claim_addr) {
if ((*ifa->ifa_claim_addr)(ifa, addr))
goto done;
continue;
}
/*
* Scan all the bits in the ifa's address.
* If a bit dissagrees with what we are
* looking for, mask it with the netmask
* to see if it really matters.
* (A byte at a time)
*/
if (ifa->ifa_netmask == 0)
continue;
cp = addr_data;
cp2 = ifa->ifa_addr->sa_data;
cp3 = ifa->ifa_netmask->sa_data;
cplim = ifa->ifa_netmask->sa_len
+ (char *)ifa->ifa_netmask;
while (cp3 < cplim)
if ((*cp++ ^ *cp2++) & *cp3++)
goto next; /* next address! */
/*
* If the netmask of what we just found
* is more specific than what we had before
* (if we had one) then remember the new one
* before continuing to search
* for an even better one.
*/
if (ifa_maybe == 0 ||
rn_refines((caddr_t)ifa->ifa_netmask,
(caddr_t)ifa_maybe->ifa_netmask))
ifa_maybe = ifa;
}
}
}
ifa = ifa_maybe;
done:
IFNET_RUNLOCK();
return (ifa);
}
/*
* Find an interface address specific to an interface best matching
* a given address.
*/
struct ifaddr *
ifaof_ifpforaddr(struct sockaddr *addr, struct ifnet *ifp)
{
struct ifaddr *ifa;
char *cp, *cp2, *cp3;
char *cplim;
struct ifaddr *ifa_maybe = 0;
u_int af = addr->sa_family;
if (af >= AF_MAX)
return (0);
TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
if (ifa->ifa_addr->sa_family != af)
continue;
if (ifa_maybe == 0)
ifa_maybe = ifa;
if (ifa->ifa_netmask == 0) {
if (equal(addr, ifa->ifa_addr) ||
(ifa->ifa_dstaddr && equal(addr, ifa->ifa_dstaddr)))
goto done;
continue;
}
if (ifp->if_flags & IFF_POINTOPOINT) {
if (equal(addr, ifa->ifa_dstaddr))
goto done;
} else {
cp = addr->sa_data;
cp2 = ifa->ifa_addr->sa_data;
cp3 = ifa->ifa_netmask->sa_data;
cplim = ifa->ifa_netmask->sa_len + (char *)ifa->ifa_netmask;
for (; cp3 < cplim; cp3++)
if ((*cp++ ^ *cp2++) & *cp3)
break;
if (cp3 == cplim)
goto done;
}
}
ifa = ifa_maybe;
done:
return (ifa);
}
#include <net/route.h>
/*
* Default action when installing a route with a Link Level gateway.
* Lookup an appropriate real ifa to point to.
* This should be moved to /sys/net/link.c eventually.
*/
static void
link_rtrequest(int cmd, struct rtentry *rt, struct rt_addrinfo *info)
{
struct ifaddr *ifa, *oifa;
struct sockaddr *dst;
struct ifnet *ifp;
RT_LOCK_ASSERT(rt);
if (cmd != RTM_ADD || ((ifa = rt->rt_ifa) == 0) ||
((ifp = ifa->ifa_ifp) == 0) || ((dst = rt_key(rt)) == 0))
return;
ifa = ifaof_ifpforaddr(dst, ifp);
if (ifa) {
IFAREF(ifa); /* XXX */
oifa = rt->rt_ifa;
rt->rt_ifa = ifa;
IFAFREE(oifa);
if (ifa->ifa_rtrequest && ifa->ifa_rtrequest != link_rtrequest)
ifa->ifa_rtrequest(cmd, rt, info);
}
}
/*
* Mark an interface down and notify protocols of
* the transition.
* NOTE: must be called at splnet or eqivalent.
*/
static void
if_unroute(struct ifnet *ifp, int flag, int fam)
{
struct ifaddr *ifa;
ifp->if_flags &= ~flag;
getmicrotime(&ifp->if_lastchange);
TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link)
if (fam == PF_UNSPEC || (fam == ifa->ifa_addr->sa_family))
pfctlinput(PRC_IFDOWN, ifa->ifa_addr);
if_qflush(&ifp->if_snd);
rt_ifmsg(ifp);
}
/*
* Mark an interface up and notify protocols of
* the transition.
* NOTE: must be called at splnet or eqivalent.
*/
static void
if_route(struct ifnet *ifp, int flag, int fam)
{
struct ifaddr *ifa;
ifp->if_flags |= flag;
getmicrotime(&ifp->if_lastchange);
TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link)
if (fam == PF_UNSPEC || (fam == ifa->ifa_addr->sa_family))
pfctlinput(PRC_IFUP, ifa->ifa_addr);
rt_ifmsg(ifp);
#ifdef INET6
in6_if_up(ifp);
#endif
}
void (*vlan_link_state_p)(struct ifnet *, int); /* XXX: private from if_vlan */
/*
* Handle a change in the interface link state.
*/
void
if_link_state_change(struct ifnet *ifp, int link_state)
{
int link;
/* Notify that the link state has changed. */
if (ifp->if_link_state != link_state) {
ifp->if_link_state = link_state;
rt_ifmsg(ifp);
if (link_state == LINK_STATE_UP)
link = NOTE_LINKUP;
else if (link_state == LINK_STATE_DOWN)
link = NOTE_LINKDOWN;
else
link = NOTE_LINKINV;
KNOTE_UNLOCKED(&ifp->if_klist, link);
if (ifp->if_nvlans != 0)
(*vlan_link_state_p)(ifp, link);
if ((ifp->if_type == IFT_ETHER || ifp->if_type == IFT_L2VLAN) &&
IFP2AC(ifp)->ac_netgraph != NULL)
(*ng_ether_link_state_p)(ifp, link_state);
log(LOG_NOTICE, "%s: link state changed to %s\n", ifp->if_xname,
(link_state == LINK_STATE_UP) ? "UP" : "DOWN" );
}
}
/*
* Mark an interface down and notify protocols of
* the transition.
* NOTE: must be called at splnet or eqivalent.
*/
void
if_down(struct ifnet *ifp)
{
if_unroute(ifp, IFF_UP, AF_UNSPEC);
}
/*
* Mark an interface up and notify protocols of
* the transition.
* NOTE: must be called at splnet or eqivalent.
*/
void
if_up(struct ifnet *ifp)
{
if_route(ifp, IFF_UP, AF_UNSPEC);
}
/*
* Flush an interface queue.
*/
static void
if_qflush(struct ifaltq *ifq)
{
struct mbuf *m, *n;
IFQ_LOCK(ifq);
#ifdef ALTQ
if (ALTQ_IS_ENABLED(ifq))
ALTQ_PURGE(ifq);
#endif
n = ifq->ifq_head;
while ((m = n) != 0) {
n = m->m_act;
m_freem(m);
}
ifq->ifq_head = 0;
ifq->ifq_tail = 0;
ifq->ifq_len = 0;
IFQ_UNLOCK(ifq);
}
/*
* Handle interface watchdog timer routines. Called
* from softclock, we decrement timers (if set) and
* call the appropriate interface routine on expiration.
*
* XXXRW: Note that because timeouts run with Giant, if_watchdog() is called
* holding Giant. If we switch to an MPSAFE callout, we likely need to grab
* Giant before entering if_watchdog() on an IFF_NEEDSGIANT interface.
*/
static void
if_slowtimo(void *arg)
{
struct ifnet *ifp;
int s = splimp();
IFNET_RLOCK();
TAILQ_FOREACH(ifp, &ifnet, if_link) {
if (ifp->if_timer == 0 || --ifp->if_timer)
continue;
if (ifp->if_watchdog)
(*ifp->if_watchdog)(ifp);
}
IFNET_RUNLOCK();
splx(s);
timeout(if_slowtimo, (void *)0, hz / IFNET_SLOWHZ);
}
/*
* Map interface name to
* interface structure pointer.
*/
struct ifnet *
ifunit(const char *name)
{
struct ifnet *ifp;
IFNET_RLOCK();
TAILQ_FOREACH(ifp, &ifnet, if_link) {
if (strncmp(name, ifp->if_xname, IFNAMSIZ) == 0)
break;
}
IFNET_RUNLOCK();
return (ifp);
}
/*
* Hardware specific interface ioctls.
*/
static int
ifhwioctl(u_long cmd, struct ifnet *ifp, caddr_t data, struct thread *td)
{
struct ifreq *ifr;
struct ifstat *ifs;
int error = 0;
int new_flags;
size_t namelen, onamelen;
char new_name[IFNAMSIZ];
struct ifaddr *ifa;
struct sockaddr_dl *sdl;
ifr = (struct ifreq *)data;
switch (cmd) {
case SIOCGIFINDEX:
ifr->ifr_index = ifp->if_index;
break;
case SIOCGIFFLAGS:
ifr->ifr_flags = ifp->if_flags & 0xffff;
ifr->ifr_flagshigh = ifp->if_flags >> 16;
break;
case SIOCGIFCAP:
ifr->ifr_reqcap = ifp->if_capabilities;
ifr->ifr_curcap = ifp->if_capenable;
break;
#ifdef MAC
case SIOCGIFMAC:
error = mac_ioctl_ifnet_get(td->td_ucred, ifr, ifp);
break;
#endif
case SIOCGIFMETRIC:
ifr->ifr_metric = ifp->if_metric;
break;
case SIOCGIFMTU:
ifr->ifr_mtu = ifp->if_mtu;
break;
case SIOCGIFPHYS:
ifr->ifr_phys = ifp->if_physical;
break;
case SIOCSIFFLAGS:
error = suser(td);
if (error)
return (error);
new_flags = (ifr->ifr_flags & 0xffff) |
(ifr->ifr_flagshigh << 16);
if (ifp->if_flags & IFF_SMART) {
/* Smart drivers twiddle their own routes */
} else if (ifp->if_flags & IFF_UP &&
(new_flags & IFF_UP) == 0) {
int s = splimp();
if_down(ifp);
splx(s);
} else if (new_flags & IFF_UP &&
(ifp->if_flags & IFF_UP) == 0) {
int s = splimp();
if_up(ifp);
splx(s);
}
ifp->if_flags = (ifp->if_flags & IFF_CANTCHANGE) |
(new_flags &~ IFF_CANTCHANGE);
if (new_flags & IFF_PPROMISC) {
/* Permanently promiscuous mode requested */
ifp->if_flags |= IFF_PROMISC;
} else if (ifp->if_pcount == 0) {
ifp->if_flags &= ~IFF_PROMISC;
}
if (ifp->if_ioctl) {
IFF_LOCKGIANT(ifp);
(void) (*ifp->if_ioctl)(ifp, cmd, data);
IFF_UNLOCKGIANT(ifp);
}
getmicrotime(&ifp->if_lastchange);
break;
case SIOCSIFCAP:
error = suser(td);
if (error)
return (error);
if (ifp->if_ioctl == NULL)
return (EOPNOTSUPP);
if (ifr->ifr_reqcap & ~ifp->if_capabilities)
return (EINVAL);
IFF_LOCKGIANT(ifp);
error = (*ifp->if_ioctl)(ifp, cmd, data);
IFF_UNLOCKGIANT(ifp);
if (error == 0)
getmicrotime(&ifp->if_lastchange);
break;
#ifdef MAC
case SIOCSIFMAC:
error = mac_ioctl_ifnet_set(td->td_ucred, ifr, ifp);
break;
#endif
case SIOCSIFNAME:
error = suser(td);
if (error != 0)
return (error);
error = copyinstr(ifr->ifr_data, new_name, IFNAMSIZ, NULL);
if (error != 0)
return (error);
if (new_name[0] == '\0')
return (EINVAL);
if (ifunit(new_name) != NULL)
return (EEXIST);
EVENTHANDLER_INVOKE(ifnet_departure_event, ifp);
/* Announce the departure of the interface. */
rt_ifannouncemsg(ifp, IFAN_DEPARTURE);
log(LOG_INFO, "%s: changing name to '%s'\n",
ifp->if_xname, new_name);
strlcpy(ifp->if_xname, new_name, sizeof(ifp->if_xname));
ifa = ifaddr_byindex(ifp->if_index);
IFA_LOCK(ifa);
sdl = (struct sockaddr_dl *)ifa->ifa_addr;
namelen = strlen(new_name);
onamelen = sdl->sdl_nlen;
/*
* Move the address if needed. This is safe because we
* allocate space for a name of length IFNAMSIZ when we
* create this in if_attach().
*/
if (namelen != onamelen) {
bcopy(sdl->sdl_data + onamelen,
sdl->sdl_data + namelen, sdl->sdl_alen);
}
bcopy(new_name, sdl->sdl_data, namelen);
sdl->sdl_nlen = namelen;
sdl = (struct sockaddr_dl *)ifa->ifa_netmask;
bzero(sdl->sdl_data, onamelen);
while (namelen != 0)
sdl->sdl_data[--namelen] = 0xff;
IFA_UNLOCK(ifa);
EVENTHANDLER_INVOKE(ifnet_arrival_event, ifp);
/* Announce the return of the interface. */
rt_ifannouncemsg(ifp, IFAN_ARRIVAL);
break;
case SIOCSIFMETRIC:
error = suser(td);
if (error)
return (error);
ifp->if_metric = ifr->ifr_metric;
getmicrotime(&ifp->if_lastchange);
break;
case SIOCSIFPHYS:
error = suser(td);
if (error)
return (error);
if (ifp->if_ioctl == NULL)
return (EOPNOTSUPP);
IFF_LOCKGIANT(ifp);
error = (*ifp->if_ioctl)(ifp, cmd, data);
IFF_UNLOCKGIANT(ifp);
if (error == 0)
getmicrotime(&ifp->if_lastchange);
break;
case SIOCSIFMTU:
{
u_long oldmtu = ifp->if_mtu;
error = suser(td);
if (error)
return (error);
if (ifr->ifr_mtu < IF_MINMTU || ifr->ifr_mtu > IF_MAXMTU)
return (EINVAL);
if (ifp->if_ioctl == NULL)
return (EOPNOTSUPP);
IFF_LOCKGIANT(ifp);
error = (*ifp->if_ioctl)(ifp, cmd, data);
IFF_UNLOCKGIANT(ifp);
if (error == 0) {
getmicrotime(&ifp->if_lastchange);
rt_ifmsg(ifp);
}
/*
* If the link MTU changed, do network layer specific procedure.
*/
if (ifp->if_mtu != oldmtu) {
#ifdef INET6
nd6_setmtu(ifp);
#endif
}
break;
}
case SIOCADDMULTI:
case SIOCDELMULTI:
error = suser(td);
if (error)
return (error);
/* Don't allow group membership on non-multicast interfaces. */
if ((ifp->if_flags & IFF_MULTICAST) == 0)
return (EOPNOTSUPP);
/* Don't let users screw up protocols' entries. */
if (ifr->ifr_addr.sa_family != AF_LINK)
return (EINVAL);
if (cmd == SIOCADDMULTI) {
struct ifmultiaddr *ifma;
error = if_addmulti(ifp, &ifr->ifr_addr, &ifma);
} else {
error = if_delmulti(ifp, &ifr->ifr_addr);
}
if (error == 0)
getmicrotime(&ifp->if_lastchange);
break;
case SIOCSIFPHYADDR:
case SIOCDIFPHYADDR:
#ifdef INET6
case SIOCSIFPHYADDR_IN6:
#endif
case SIOCSLIFPHYADDR:
case SIOCSIFMEDIA:
case SIOCSIFGENERIC:
error = suser(td);
if (error)
return (error);
if (ifp->if_ioctl == NULL)
return (EOPNOTSUPP);
IFF_LOCKGIANT(ifp);
error = (*ifp->if_ioctl)(ifp, cmd, data);
IFF_UNLOCKGIANT(ifp);
if (error == 0)
getmicrotime(&ifp->if_lastchange);
break;
case SIOCGIFSTATUS:
ifs = (struct ifstat *)data;
ifs->ascii[0] = '\0';
case SIOCGIFPSRCADDR:
case SIOCGIFPDSTADDR:
case SIOCGLIFPHYADDR:
case SIOCGIFMEDIA:
case SIOCGIFGENERIC:
if (ifp->if_ioctl == NULL)
return (EOPNOTSUPP);
IFF_LOCKGIANT(ifp);
error = (*ifp->if_ioctl)(ifp, cmd, data);
IFF_UNLOCKGIANT(ifp);
break;
case SIOCSIFLLADDR:
error = suser(td);
if (error)
return (error);
error = if_setlladdr(ifp,
ifr->ifr_addr.sa_data, ifr->ifr_addr.sa_len);
break;
default:
error = ENOIOCTL;
break;
}
return (error);
}
/*
* Interface ioctls.
*/
int
ifioctl(struct socket *so, u_long cmd, caddr_t data, struct thread *td)
{
struct ifnet *ifp;
struct ifreq *ifr;
int error;
int oif_flags;
switch (cmd) {
case SIOCGIFCONF:
case OSIOCGIFCONF:
return (ifconf(cmd, data));
}
ifr = (struct ifreq *)data;
switch (cmd) {
case SIOCIFCREATE:
case SIOCIFDESTROY:
if ((error = suser(td)) != 0)
return (error);
return ((cmd == SIOCIFCREATE) ?
if_clone_create(ifr->ifr_name, sizeof(ifr->ifr_name)) :
if_clone_destroy(ifr->ifr_name));
case SIOCIFGCLONERS:
return (if_clone_list((struct if_clonereq *)data));
}
ifp = ifunit(ifr->ifr_name);
if (ifp == 0)
return (ENXIO);
error = ifhwioctl(cmd, ifp, data, td);
if (error != ENOIOCTL)
return (error);
oif_flags = ifp->if_flags;
if (so->so_proto == 0)
return (EOPNOTSUPP);
#ifndef COMPAT_43
error = ((*so->so_proto->pr_usrreqs->pru_control)(so, cmd,
data,
ifp, td));
#else
{
int ocmd = cmd;
switch (cmd) {
case SIOCSIFDSTADDR:
case SIOCSIFADDR:
case SIOCSIFBRDADDR:
case SIOCSIFNETMASK:
#if BYTE_ORDER != BIG_ENDIAN
if (ifr->ifr_addr.sa_family == 0 &&
ifr->ifr_addr.sa_len < 16) {
ifr->ifr_addr.sa_family = ifr->ifr_addr.sa_len;
ifr->ifr_addr.sa_len = 16;
}
#else
if (ifr->ifr_addr.sa_len == 0)
ifr->ifr_addr.sa_len = 16;
#endif
break;
case OSIOCGIFADDR:
cmd = SIOCGIFADDR;
break;
case OSIOCGIFDSTADDR:
cmd = SIOCGIFDSTADDR;
break;
case OSIOCGIFBRDADDR:
cmd = SIOCGIFBRDADDR;
break;
case OSIOCGIFNETMASK:
cmd = SIOCGIFNETMASK;
}
error = ((*so->so_proto->pr_usrreqs->pru_control)(so,
cmd,
data,
ifp, td));
switch (ocmd) {
case OSIOCGIFADDR:
case OSIOCGIFDSTADDR:
case OSIOCGIFBRDADDR:
case OSIOCGIFNETMASK:
*(u_short *)&ifr->ifr_addr = ifr->ifr_addr.sa_family;
}
}
#endif /* COMPAT_43 */
if ((oif_flags ^ ifp->if_flags) & IFF_UP) {
#ifdef INET6
DELAY(100);/* XXX: temporary workaround for fxp issue*/
if (ifp->if_flags & IFF_UP) {
int s = splimp();
in6_if_up(ifp);
splx(s);
}
#endif
}
return (error);
}
/*
* Set/clear promiscuous mode on interface ifp based on the truth value
* of pswitch. The calls are reference counted so that only the first
* "on" request actually has an effect, as does the final "off" request.
* Results are undefined if the "off" and "on" requests are not matched.
*/
int
ifpromisc(struct ifnet *ifp, int pswitch)
{
struct ifreq ifr;
int error;
int oldflags, oldpcount;
oldpcount = ifp->if_pcount;
oldflags = ifp->if_flags;
if (ifp->if_flags & IFF_PPROMISC) {
/* Do nothing if device is in permanently promiscuous mode */
ifp->if_pcount += pswitch ? 1 : -1;
return (0);
}
if (pswitch) {
/*
* If the device is not configured up, we cannot put it in
* promiscuous mode.
*/
if ((ifp->if_flags & IFF_UP) == 0)
return (ENETDOWN);
if (ifp->if_pcount++ != 0)
return (0);
ifp->if_flags |= IFF_PROMISC;
} else {
if (--ifp->if_pcount > 0)
return (0);
ifp->if_flags &= ~IFF_PROMISC;
}
ifr.ifr_flags = ifp->if_flags & 0xffff;
ifr.ifr_flagshigh = ifp->if_flags >> 16;
IFF_LOCKGIANT(ifp);
error = (*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, (caddr_t)&ifr);
IFF_UNLOCKGIANT(ifp);
if (error == 0) {
log(LOG_INFO, "%s: promiscuous mode %s\n",
ifp->if_xname,
(ifp->if_flags & IFF_PROMISC) ? "enabled" : "disabled");
rt_ifmsg(ifp);
} else {
ifp->if_pcount = oldpcount;
ifp->if_flags = oldflags;
}
return error;
}
/*
* Return interface configuration
* of system. List may be used
* in later ioctl's (above) to get
* other information.
*/
/*ARGSUSED*/
static int
ifconf(u_long cmd, caddr_t data)
{
struct ifconf *ifc = (struct ifconf *)data;
struct ifnet *ifp;
struct ifaddr *ifa;
struct ifreq ifr;
struct sbuf *sb;
int error, full = 0, valid_len, max_len;
/* Limit initial buffer size to MAXPHYS to avoid DoS from userspace. */
max_len = MAXPHYS - 1;
/* Prevent hostile input from being able to crash the system */
if (ifc->ifc_len <= 0)
return (EINVAL);
again:
if (ifc->ifc_len <= max_len) {
max_len = ifc->ifc_len;
full = 1;
}
sb = sbuf_new(NULL, NULL, max_len + 1, SBUF_FIXEDLEN);
max_len = 0;
valid_len = 0;
IFNET_RLOCK(); /* could sleep XXX */
TAILQ_FOREACH(ifp, &ifnet, if_link) {
int addrs;
if (strlcpy(ifr.ifr_name, ifp->if_xname, sizeof(ifr.ifr_name))
>= sizeof(ifr.ifr_name))
return (ENAMETOOLONG);
addrs = 0;
TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
struct sockaddr *sa = ifa->ifa_addr;
if (jailed(curthread->td_ucred) &&
prison_if(curthread->td_ucred, sa))
continue;
addrs++;
#ifdef COMPAT_43
if (cmd == OSIOCGIFCONF) {
struct osockaddr *osa =
(struct osockaddr *)&ifr.ifr_addr;
ifr.ifr_addr = *sa;
osa->sa_family = sa->sa_family;
sbuf_bcat(sb, &ifr, sizeof(ifr));
max_len += sizeof(ifr);
} else
#endif
if (sa->sa_len <= sizeof(*sa)) {
ifr.ifr_addr = *sa;
sbuf_bcat(sb, &ifr, sizeof(ifr));
max_len += sizeof(ifr);
} else {
sbuf_bcat(sb, &ifr,
offsetof(struct ifreq, ifr_addr));
max_len += offsetof(struct ifreq, ifr_addr);
sbuf_bcat(sb, sa, sa->sa_len);
max_len += sa->sa_len;
}
if (!sbuf_overflowed(sb))
valid_len = sbuf_len(sb);
}
if (addrs == 0) {
bzero((caddr_t)&ifr.ifr_addr, sizeof(ifr.ifr_addr));
sbuf_bcat(sb, &ifr, sizeof(ifr));
max_len += sizeof(ifr);
if (!sbuf_overflowed(sb))
valid_len = sbuf_len(sb);
}
}
IFNET_RUNLOCK();
/*
* If we didn't allocate enough space (uncommon), try again. If
* we have already allocated as much space as we are allowed,
* return what we've got.
*/
if (valid_len != max_len && !full) {
sbuf_delete(sb);
goto again;
}
ifc->ifc_len = valid_len;
sbuf_finish(sb);
error = copyout(sbuf_data(sb), ifc->ifc_req, ifc->ifc_len);
sbuf_delete(sb);
return (error);
}
/*
* Just like if_promisc(), but for all-multicast-reception mode.
*/
int
if_allmulti(struct ifnet *ifp, int onswitch)
{
int error = 0;
int s = splimp();
struct ifreq ifr;
if (onswitch) {
if (ifp->if_amcount++ == 0) {
ifp->if_flags |= IFF_ALLMULTI;
ifr.ifr_flags = ifp->if_flags & 0xffff;
ifr.ifr_flagshigh = ifp->if_flags >> 16;
IFF_LOCKGIANT(ifp);
error = ifp->if_ioctl(ifp, SIOCSIFFLAGS, (caddr_t)&ifr);
IFF_UNLOCKGIANT(ifp);
}
} else {
if (ifp->if_amcount > 1) {
ifp->if_amcount--;
} else {
ifp->if_amcount = 0;
ifp->if_flags &= ~IFF_ALLMULTI;
ifr.ifr_flags = ifp->if_flags & 0xffff;;
ifr.ifr_flagshigh = ifp->if_flags >> 16;
IFF_LOCKGIANT(ifp);
error = ifp->if_ioctl(ifp, SIOCSIFFLAGS, (caddr_t)&ifr);
IFF_UNLOCKGIANT(ifp);
}
}
splx(s);
if (error == 0)
rt_ifmsg(ifp);
return error;
}
/*
* Add a multicast listenership to the interface in question.
* The link layer provides a routine which converts
*/
int
if_addmulti(struct ifnet *ifp, struct sockaddr *sa, struct ifmultiaddr **retifma)
{
struct sockaddr *llsa, *dupsa;
int error, s;
struct ifmultiaddr *ifma;
/*
* If the matching multicast address already exists
* then don't add a new one, just add a reference
*/
TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) {
if (equal(sa, ifma->ifma_addr)) {
ifma->ifma_refcount++;
if (retifma)
*retifma = ifma;
return 0;
}
}
/*
* Give the link layer a chance to accept/reject it, and also
* find out which AF_LINK address this maps to, if it isn't one
* already.
*/
if (ifp->if_resolvemulti) {
error = ifp->if_resolvemulti(ifp, &llsa, sa);
if (error) return error;
} else {
llsa = 0;
}
MALLOC(ifma, struct ifmultiaddr *, sizeof *ifma, M_IFMADDR, M_WAITOK);
MALLOC(dupsa, struct sockaddr *, sa->sa_len, M_IFMADDR, M_WAITOK);
bcopy(sa, dupsa, sa->sa_len);
ifma->ifma_addr = dupsa;
ifma->ifma_lladdr = llsa;
ifma->ifma_ifp = ifp;
ifma->ifma_refcount = 1;
ifma->ifma_protospec = 0;
rt_newmaddrmsg(RTM_NEWMADDR, ifma);
/*
* Some network interfaces can scan the address list at
* interrupt time; lock them out.
*/
s = splimp();
TAILQ_INSERT_HEAD(&ifp->if_multiaddrs, ifma, ifma_link);
splx(s);
if (retifma != NULL)
*retifma = ifma;
if (llsa != 0) {
TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) {
if (equal(ifma->ifma_addr, llsa))
break;
}
if (ifma) {
ifma->ifma_refcount++;
} else {
MALLOC(ifma, struct ifmultiaddr *, sizeof *ifma,
M_IFMADDR, M_WAITOK);
MALLOC(dupsa, struct sockaddr *, llsa->sa_len,
M_IFMADDR, M_WAITOK);
bcopy(llsa, dupsa, llsa->sa_len);
ifma->ifma_addr = dupsa;
ifma->ifma_lladdr = NULL;
ifma->ifma_ifp = ifp;
ifma->ifma_refcount = 1;
ifma->ifma_protospec = 0;
s = splimp();
TAILQ_INSERT_HEAD(&ifp->if_multiaddrs, ifma, ifma_link);
splx(s);
}
}
/*
* We are certain we have added something, so call down to the
* interface to let them know about it.
*/
s = splimp();
IFF_LOCKGIANT(ifp);
ifp->if_ioctl(ifp, SIOCADDMULTI, 0);
IFF_UNLOCKGIANT(ifp);
splx(s);
return 0;
}
/*
* Remove a reference to a multicast address on this interface. Yell
* if the request does not match an existing membership.
*/
int
if_delmulti(struct ifnet *ifp, struct sockaddr *sa)
{
struct ifmultiaddr *ifma;
int s;
TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link)
if (equal(sa, ifma->ifma_addr))
break;
if (ifma == 0)
return ENOENT;
if (ifma->ifma_refcount > 1) {
ifma->ifma_refcount--;
return 0;
}
rt_newmaddrmsg(RTM_DELMADDR, ifma);
sa = ifma->ifma_lladdr;
s = splimp();
TAILQ_REMOVE(&ifp->if_multiaddrs, ifma, ifma_link);
/*
* Make sure the interface driver is notified
* in the case of a link layer mcast group being left.
*/
if (ifma->ifma_addr->sa_family == AF_LINK && sa == 0) {
IFF_LOCKGIANT(ifp);
ifp->if_ioctl(ifp, SIOCDELMULTI, 0);
IFF_UNLOCKGIANT(ifp);
}
splx(s);
free(ifma->ifma_addr, M_IFMADDR);
free(ifma, M_IFMADDR);
if (sa == 0)
return 0;
/*
* Now look for the link-layer address which corresponds to
* this network address. It had been squirreled away in
* ifma->ifma_lladdr for this purpose (so we don't have
* to call ifp->if_resolvemulti() again), and we saved that
* value in sa above. If some nasty deleted the
* link-layer address out from underneath us, we can deal because
* the address we stored was is not the same as the one which was
* in the record for the link-layer address. (So we don't complain
* in that case.)
*/
TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link)
if (equal(sa, ifma->ifma_addr))
break;
if (ifma == 0)
return 0;
if (ifma->ifma_refcount > 1) {
ifma->ifma_refcount--;
return 0;
}
s = splimp();
TAILQ_REMOVE(&ifp->if_multiaddrs, ifma, ifma_link);
IFF_LOCKGIANT(ifp);
ifp->if_ioctl(ifp, SIOCDELMULTI, 0);
IFF_UNLOCKGIANT(ifp);
splx(s);
free(ifma->ifma_addr, M_IFMADDR);
free(sa, M_IFMADDR);
free(ifma, M_IFMADDR);
return 0;
}
/*
* Set the link layer address on an interface.
*
* At this time we only support certain types of interfaces,
* and we don't allow the length of the address to change.
*/
int
if_setlladdr(struct ifnet *ifp, const u_char *lladdr, int len)
{
struct sockaddr_dl *sdl;
struct ifaddr *ifa;
struct ifreq ifr;
ifa = ifaddr_byindex(ifp->if_index);
if (ifa == NULL)
return (EINVAL);
sdl = (struct sockaddr_dl *)ifa->ifa_addr;
if (sdl == NULL)
return (EINVAL);
if (len != sdl->sdl_alen) /* don't allow length to change */
return (EINVAL);
switch (ifp->if_type) {
case IFT_ETHER: /* these types use struct arpcom */
case IFT_FDDI:
case IFT_XETHER:
case IFT_ISO88025:
case IFT_L2VLAN:
bcopy(lladdr, IFP2AC(ifp)->ac_enaddr, len);
/*
* XXX We also need to store the lladdr in LLADDR(sdl),
* which is done below. This is a pain because we must
* remember to keep the info in sync.
*/
/* FALLTHROUGH */
case IFT_ARCNET:
bcopy(lladdr, LLADDR(sdl), len);
break;
default:
return (ENODEV);
}
/*
* If the interface is already up, we need
* to re-init it in order to reprogram its
* address filter.
*/
if ((ifp->if_flags & IFF_UP) != 0) {
IFF_LOCKGIANT(ifp);
ifp->if_flags &= ~IFF_UP;
ifr.ifr_flags = ifp->if_flags & 0xffff;
ifr.ifr_flagshigh = ifp->if_flags >> 16;
(*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, (caddr_t)&ifr);
ifp->if_flags |= IFF_UP;
ifr.ifr_flags = ifp->if_flags & 0xffff;
ifr.ifr_flagshigh = ifp->if_flags >> 16;
(*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, (caddr_t)&ifr);
IFF_UNLOCKGIANT(ifp);
#ifdef INET
/*
* Also send gratuitous ARPs to notify other nodes about
* the address change.
*/
TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
if (ifa->ifa_addr != NULL &&
ifa->ifa_addr->sa_family == AF_INET)
arp_ifinit(ifp, ifa);
}
#endif
}
return (0);
}
struct ifmultiaddr *
ifmaof_ifpforaddr(struct sockaddr *sa, struct ifnet *ifp)
{
struct ifmultiaddr *ifma;
TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link)
if (equal(ifma->ifma_addr, sa))
break;
return ifma;
}
/*
* The name argument must be a pointer to storage which will last as
* long as the interface does. For physical devices, the result of
* device_get_name(dev) is a good choice and for pseudo-devices a
* static string works well.
*/
void
if_initname(struct ifnet *ifp, const char *name, int unit)
{
ifp->if_dname = name;
ifp->if_dunit = unit;
if (unit != IF_DUNIT_NONE)
snprintf(ifp->if_xname, IFNAMSIZ, "%s%d", name, unit);
else
strlcpy(ifp->if_xname, name, IFNAMSIZ);
}
int
if_printf(struct ifnet *ifp, const char * fmt, ...)
{
va_list ap;
int retval;
retval = printf("%s: ", ifp->if_xname);
va_start(ap, fmt);
retval += vprintf(fmt, ap);
va_end(ap);
return (retval);
}
/*
* When an interface is marked IFF_NEEDSGIANT, its if_start() routine cannot
* be called without Giant. However, we often can't acquire the Giant lock
* at those points; instead, we run it via a task queue that holds Giant via
* if_start_deferred.
*
* XXXRW: We need to make sure that the ifnet isn't fully detached until any
* outstanding if_start_deferred() tasks that will run after the free. This
* probably means waiting in if_detach().
*/
void
if_start(struct ifnet *ifp)
{
NET_ASSERT_GIANT();
if ((ifp->if_flags & IFF_NEEDSGIANT) != 0 && debug_mpsafenet != 0) {
if (mtx_owned(&Giant))
(*(ifp)->if_start)(ifp);
else
taskqueue_enqueue(taskqueue_swi_giant,
&ifp->if_starttask);
} else
(*(ifp)->if_start)(ifp);
}
static void
if_start_deferred(void *context, int pending)
{
struct ifnet *ifp;
/*
* This code must be entered with Giant, and should never run if
* we're not running with debug.mpsafenet.
*/
KASSERT(debug_mpsafenet != 0, ("if_start_deferred: debug.mpsafenet"));
GIANT_REQUIRED;
ifp = (struct ifnet *)context;
(ifp->if_start)(ifp);
}
int
if_handoff(struct ifqueue *ifq, struct mbuf *m, struct ifnet *ifp, int adjust)
{
int active = 0;
IF_LOCK(ifq);
if (_IF_QFULL(ifq)) {
_IF_DROP(ifq);
IF_UNLOCK(ifq);
m_freem(m);
return (0);
}
if (ifp != NULL) {
ifp->if_obytes += m->m_pkthdr.len + adjust;
if (m->m_flags & (M_BCAST|M_MCAST))
ifp->if_omcasts++;
active = ifp->if_flags & IFF_OACTIVE;
}
_IF_ENQUEUE(ifq, m);
IF_UNLOCK(ifq);
if (ifp != NULL && !active)
if_start(ifp);
return (1);
}
SYSCTL_NODE(_net, PF_LINK, link, CTLFLAG_RW, 0, "Link layers");
SYSCTL_NODE(_net_link, 0, generic, CTLFLAG_RW, 0, "Generic link-management");
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