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freebsd-skq/sys/net/if.c
ru 7bbde3fb1f Introduce an interface announcement message for the routing 
socket so that routing daemons and other interested parties
know when an interface is attached/detached.

PR:		kern/33747
Obtained from:	NetBSD
MFC after:	2 weeks
2002-01-18 14:33:04 +00:00

1842 lines
41 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.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 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 <sys/param.h>
#include <sys/conf.h>
#include <sys/malloc.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/jail.h>
#include <net/if.h>
#include <net/if_arp.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
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 ifqueue *);
static void if_slowtimo(void *);
static void link_rtrequest(int, struct rtentry *, struct rt_addrinfo *);
static int if_rtdel(struct radix_node *, void *);
static struct if_clone *if_clone_lookup(const char *, int *);
static int if_clone_list(struct if_clonereq *);
static int ifhwioctl(u_long, struct ifnet *, caddr_t, struct thread *);
#ifdef INET6
/*
* XXX: declare here to avoid to include many inet6 related files..
* should be more generalized?
*/
extern void nd6_setmtu __P((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 */
int if_cloners_count;
LIST_HEAD(, if_clone) if_cloners = LIST_HEAD_INITIALIZER(if_cloners);
static int if_indexlim = 8;
static struct klist 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");
#define CDEV_MAJOR 165
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 = {
/* open */ netopen,
/* close */ netclose,
/* read */ noread,
/* write */ nowrite,
/* ioctl */ netioctl,
/* poll */ nopoll,
/* mmap */ nommap,
/* strategy */ nostrategy,
/* name */ "net",
/* maj */ CDEV_MAJOR,
/* dump */ nodump,
/* psize */ nopsize,
/* flags */ D_KQFILTER,
/* kqfilter */ netkqfilter,
};
static int
netopen(dev_t dev, int flag, int mode, struct thread *td)
{
return (0);
}
static int
netclose(dev_t dev, int flags, int fmt, struct thread *td)
{
return (0);
}
static int
netioctl(dev_t 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(dev_t dev, struct knote *kn)
{
struct klist *klist;
struct ifnet *ifp;
int idx;
idx = minor(dev);
if (idx == 0) {
klist = &ifklist;
} else {
ifp = ifnet_byindex(idx);
if (ifp == NULL)
return (1);
klist = &ifp->if_klist;
}
switch (kn->kn_filter) {
case EVFILT_NETDEV:
kn->kn_fop = &netdev_filtops;
break;
default:
return (1);
}
kn->kn_hook = (caddr_t)klist;
/* XXX locking? */
SLIST_INSERT_HEAD(klist, kn, kn_selnext);
return (0);
}
static void
filt_netdetach(struct knote *kn)
{
struct klist *klist = (struct klist *)kn->kn_hook;
if (kn->kn_status & KN_DETACHED)
return;
SLIST_REMOVE(klist, kn, knote, kn_selnext);
}
static int
filt_netdev(struct knote *kn, long hint)
{
/*
* Currently NOTE_EXIT is abused to indicate device detach.
*/
if (hint == NOTE_EXIT) {
kn->kn_data = NOTE_LINKINV;
kn->kn_status |= KN_DETACHED;
kn->kn_flags |= (EV_EOF | EV_ONESHOT);
return (1);
}
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(dummy)
void *dummy;
{
TAILQ_INIT(&ifnet);
SLIST_INIT(&ifklist);
if_grow(); /* create initial table */
ifdev_byindex(0) = make_dev(&net_cdevsw, 0,
UID_ROOT, GID_WHEEL, 0600, "network");
}
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(dummy)
void *dummy;
{
struct ifnet *ifp;
int s;
s = splimp();
TAILQ_FOREACH(ifp, &ifnet, if_link) {
if (ifp->if_snd.ifq_maxlen == 0) {
printf("%s%d XXX: driver didn't set ifq_maxlen\n",
ifp->if_name, ifp->if_unit);
ifp->if_snd.ifq_maxlen = ifqmaxlen;
}
if (!mtx_initialized(&ifp->if_snd.ifq_mtx)) {
printf("%s%d XXX: driver didn't initialize queue mtx\n",
ifp->if_name, ifp->if_unit);
mtx_init(&ifp->if_snd.ifq_mtx, "unknown", MTX_DEF);
}
}
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",
((struct arpcom *)ifp->if_softc)->ac_enaddr, ":");
break;
default:
eaddr[0] = '\0';
break;
}
snprintf(devname, 32, "%s%d", ifp->if_name, ifp->if_unit);
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(ifp)
struct ifnet *ifp;
{
unsigned socksize, ifasize;
int namelen, masklen;
char workbuf[64];
register struct sockaddr_dl *sdl;
register struct ifaddr *ifa;
TAILQ_INSERT_TAIL(&ifnet, ifp, if_link);
/*
* 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);
SLIST_INIT(&ifp->if_klist);
getmicrotime(&ifp->if_lastchange);
ifp->if_index = if_findindex(ifp);
if (ifp->if_index > if_index)
if_index = ifp->if_index;
if (if_index >= if_indexlim)
if_grow();
ifnet_byindex(ifp->if_index) = ifp;
ifdev_byindex(ifp->if_index) = make_dev(&net_cdevsw, ifp->if_index,
UID_ROOT, GID_WHEEL, 0600, "%s/%s%d",
net_cdevsw.d_name, ifp->if_name, ifp->if_unit);
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_name, MTX_DEF);
/*
* create a Link Level name for this device
*/
namelen = snprintf(workbuf, sizeof(workbuf),
"%s%d", ifp->if_name, ifp->if_unit);
#define _offsetof(t, m) ((int)((caddr_t)&((t *)0)->m))
masklen = _offsetof(struct sockaddr_dl, sdl_data[0]) + namelen;
socksize = masklen + ifp->if_addrlen;
#define ROUNDUP(a) (1 + (((a) - 1) | (sizeof(long) - 1)))
if (socksize < sizeof(*sdl))
socksize = sizeof(*sdl);
socksize = ROUNDUP(socksize);
ifasize = sizeof(*ifa) + 2 * socksize;
ifa = (struct ifaddr *)malloc(ifasize, M_IFADDR, M_WAITOK | M_ZERO);
if (ifa) {
sdl = (struct sockaddr_dl *)(ifa + 1);
sdl->sdl_len = socksize;
sdl->sdl_family = AF_LINK;
bcopy(workbuf, 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;
TAILQ_INSERT_HEAD(&ifp->if_addrhead, ifa, ifa_link);
}
ifp->if_broadcastaddr = 0; /* reliably crash if used uninitialized */
/* Announce the interface. */
rt_ifannouncemsg(ifp, IFAN_ARRIVAL);
}
/*
* Detach an interface, removing it from the
* list of "active" interfaces.
*/
void
if_detach(ifp)
struct ifnet *ifp;
{
struct ifaddr *ifa;
struct radix_node_head *rnh;
int s;
int i;
/*
* Remove routes and flush queues.
*/
s = splnet();
if_down(ifp);
/*
* Remove address from ifindex_table[] and maybe decrement if_index.
* Clean up all addresses.
*/
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--;
for (ifa = TAILQ_FIRST(&ifp->if_addrhead); ifa;
ifa = TAILQ_FIRST(&ifp->if_addrhead)) {
#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
/*
* 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;
(void) rnh->rnh_walktree(rnh, if_rtdel, ifp);
}
/* Announce that the interface is gone. */
rt_ifannouncemsg(ifp, IFAN_DEPARTURE);
KNOTE(&ifp->if_klist, NOTE_EXIT);
TAILQ_REMOVE(&ifnet, ifp, if_link);
mtx_destroy(&ifp->if_snd.ifq_mtx);
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(rn, arg)
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);
}
/*
* Create a clone network interface.
*/
int
if_clone_create(name, len)
char *name;
int len;
{
struct if_clone *ifc;
char *dp;
int wildcard;
int unit;
int err;
ifc = if_clone_lookup(name, &unit);
if (ifc == NULL)
return (EINVAL);
if (ifunit(name) != NULL)
return (EEXIST);
wildcard = (unit < 0);
err = (*ifc->ifc_create)(ifc, &unit);
if (err != 0)
return (err);
/* In the wildcard case, we need to update the name. */
if (wildcard) {
for (dp = name; *dp != '\0'; dp++);
if (snprintf(dp, len - (dp-name), "%d", unit) >
len - (dp-name) - 1) {
/*
* This can only be a programmer error and
* there's no straightforward way to recover if
* it happens.
*/
panic("if_clone_create(): interface name too long");
}
}
return (0);
}
/*
* Destroy a clone network interface.
*/
int
if_clone_destroy(name)
const char *name;
{
struct if_clone *ifc;
struct ifnet *ifp;
ifc = if_clone_lookup(name, NULL);
if (ifc == NULL)
return (EINVAL);
ifp = ifunit(name);
if (ifp == NULL)
return (ENXIO);
if (ifc->ifc_destroy == NULL)
return (EOPNOTSUPP);
(*ifc->ifc_destroy)(ifp);
return (0);
}
/*
* Look up a network interface cloner.
*/
static struct if_clone *
if_clone_lookup(name, unitp)
const char *name;
int *unitp;
{
struct if_clone *ifc;
const char *cp;
int i;
for (ifc = LIST_FIRST(&if_cloners); ifc != NULL;) {
for (cp = name, i = 0; i < ifc->ifc_namelen; i++, cp++) {
if (ifc->ifc_name[i] != *cp)
goto next_ifc;
}
goto found_name;
next_ifc:
ifc = LIST_NEXT(ifc, ifc_list);
}
/* No match. */
return ((struct if_clone *)NULL);
found_name:
if (*cp == '\0') {
i = -1;
} else {
for (i = 0; *cp != '\0'; cp++) {
if (*cp < '0' || *cp > '9') {
/* Bogus unit number. */
return (NULL);
}
i = (i * 10) + (*cp - '0');
}
}
if (unitp != NULL)
*unitp = i;
return (ifc);
}
/*
* Register a network interface cloner.
*/
void
if_clone_attach(ifc)
struct if_clone *ifc;
{
LIST_INSERT_HEAD(&if_cloners, ifc, ifc_list);
if_cloners_count++;
}
/*
* Unregister a network interface cloner.
*/
void
if_clone_detach(ifc)
struct if_clone *ifc;
{
LIST_REMOVE(ifc, ifc_list);
if_cloners_count--;
}
/*
* Provide list of interface cloners to userspace.
*/
static int
if_clone_list(ifcr)
struct if_clonereq *ifcr;
{
char outbuf[IFNAMSIZ], *dst;
struct if_clone *ifc;
int count, error = 0;
ifcr->ifcr_total = if_cloners_count;
if ((dst = ifcr->ifcr_buffer) == NULL) {
/* Just asking how many there are. */
return (0);
}
if (ifcr->ifcr_count < 0)
return (EINVAL);
count = (if_cloners_count < ifcr->ifcr_count) ?
if_cloners_count : ifcr->ifcr_count;
for (ifc = LIST_FIRST(&if_cloners); ifc != NULL && count != 0;
ifc = LIST_NEXT(ifc, ifc_list), count--, dst += IFNAMSIZ) {
strncpy(outbuf, ifc->ifc_name, IFNAMSIZ);
outbuf[IFNAMSIZ - 1] = '\0'; /* sanity */
error = copyout(outbuf, dst, IFNAMSIZ);
if (error)
break;
}
return (error);
}
/*
* Locate an interface based on a complete address.
*/
/*ARGSUSED*/
struct ifaddr *
ifa_ifwithaddr(addr)
struct sockaddr *addr;
{
struct ifnet *ifp;
struct ifaddr *ifa;
#define equal(a1, a2) \
(bcmp((caddr_t)(a1), (caddr_t)(a2), ((struct sockaddr *)(a1))->sa_len) == 0)
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:
return (ifa);
}
/*
* Locate the point to point interface with a given destination address.
*/
/*ARGSUSED*/
struct ifaddr *
ifa_ifwithdstaddr(addr)
struct sockaddr *addr;
{
struct ifnet *ifp;
struct ifaddr *ifa;
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:
return (ifa);
}
/*
* Find an interface on a specific network. If many, choice
* is most specific found.
*/
struct ifaddr *
ifa_ifwithnet(addr)
struct sockaddr *addr;
{
register struct ifnet *ifp;
register 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) {
register 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.
*/
TAILQ_FOREACH(ifp, &ifnet, if_link) {
TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
register char *cp, *cp2, *cp3;
if (ifa->ifa_addr->sa_family != af)
next: continue;
if (
#ifdef INET6 /* XXX: for maching gif tunnel dst as routing entry gateway */
addr->sa_family != AF_INET6 &&
#endif
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:
return (ifa);
}
/*
* Find an interface address specific to an interface best matching
* a given address.
*/
struct ifaddr *
ifaof_ifpforaddr(addr, ifp)
struct sockaddr *addr;
register struct ifnet *ifp;
{
register struct ifaddr *ifa;
register char *cp, *cp2, *cp3;
register 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(cmd, rt, info)
int cmd;
register struct rtentry *rt;
struct rt_addrinfo *info;
{
register struct ifaddr *ifa;
struct sockaddr *dst;
struct ifnet *ifp;
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) {
IFAFREE(rt->rt_ifa);
rt->rt_ifa = ifa;
ifa->ifa_refcnt++;
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.
*/
void
if_unroute(ifp, flag, fam)
register struct ifnet *ifp;
int flag, fam;
{
register 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.
*/
void
if_route(ifp, flag, fam)
register struct ifnet *ifp;
int flag, fam;
{
register 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
}
/*
* Mark an interface down and notify protocols of
* the transition.
* NOTE: must be called at splnet or eqivalent.
*/
void
if_down(ifp)
register 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(ifp)
register struct ifnet *ifp;
{
if_route(ifp, IFF_UP, AF_UNSPEC);
}
/*
* Flush an interface queue.
*/
static void
if_qflush(ifq)
register struct ifqueue *ifq;
{
register struct mbuf *m, *n;
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;
}
/*
* Handle interface watchdog timer routines. Called
* from softclock, we decrement timers (if set) and
* call the appropriate interface routine on expiration.
*/
static void
if_slowtimo(arg)
void *arg;
{
register struct ifnet *ifp;
int s = splimp();
TAILQ_FOREACH(ifp, &ifnet, if_link) {
if (ifp->if_timer == 0 || --ifp->if_timer)
continue;
if (ifp->if_watchdog)
(*ifp->if_watchdog)(ifp);
}
splx(s);
timeout(if_slowtimo, (void *)0, hz / IFNET_SLOWHZ);
}
/*
* Map interface name to
* interface structure pointer.
*/
struct ifnet *
ifunit(const char *name)
{
char namebuf[IFNAMSIZ + 1];
struct ifnet *ifp;
dev_t dev;
/*
* Now search all the interfaces for this name/number
*/
/*
* XXX
* Devices should really be known as /dev/fooN, not /dev/net/fooN.
*/
snprintf(namebuf, IFNAMSIZ, "%s/%s", net_cdevsw.d_name, name);
TAILQ_FOREACH(ifp, &ifnet, if_link) {
dev = ifdev_byindex(ifp->if_index);
if (strcmp(devtoname(dev), namebuf) == 0)
break;
if (dev_named(dev, name))
break;
}
return (ifp);
}
/*
* Map interface name in a sockaddr_dl to
* interface structure pointer.
*/
struct ifnet *
if_withname(sa)
struct sockaddr *sa;
{
char ifname[IFNAMSIZ+1];
struct sockaddr_dl *sdl = (struct sockaddr_dl *)sa;
if ( (sa->sa_family != AF_LINK) || (sdl->sdl_nlen == 0) ||
(sdl->sdl_nlen > IFNAMSIZ) )
return NULL;
/*
* ifunit wants a null-terminated name. It may not be null-terminated
* in the sockaddr. We don't want to change the caller's sockaddr,
* and there might not be room to put the trailing null anyway, so we
* make a local copy that we know we can null terminate safely.
*/
bcopy(sdl->sdl_data, ifname, sdl->sdl_nlen);
ifname[sdl->sdl_nlen] = '\0';
return ifunit(ifname);
}
/*
* 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;
ifr = (struct ifreq *)data;
switch (cmd) {
case SIOCGIFINDEX:
ifr->ifr_index = ifp->if_index;
break;
case SIOCGIFFLAGS:
ifr->ifr_flags = ifp->if_flags;
break;
case SIOCGIFCAP:
ifr->ifr_reqcap = ifp->if_capabilities;
ifr->ifr_curcap = ifp->if_capenable;
break;
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(td);
if (error)
return (error);
ifr->ifr_prevflags = ifp->if_flags;
if (ifp->if_flags & IFF_SMART) {
/* Smart drivers twiddle their own routes */
} else if (ifp->if_flags & IFF_UP &&
(ifr->ifr_flags & IFF_UP) == 0) {
int s = splimp();
if_down(ifp);
splx(s);
} else if (ifr->ifr_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) |
(ifr->ifr_flags &~ IFF_CANTCHANGE);
if (ifp->if_ioctl)
(void) (*ifp->if_ioctl)(ifp, cmd, data);
getmicrotime(&ifp->if_lastchange);
break;
case SIOCSIFCAP:
error = suser_td(td);
if (error)
return (error);
if (ifr->ifr_reqcap & ~ifp->if_capabilities)
return (EINVAL);
(void) (*ifp->if_ioctl)(ifp, cmd, data);
break;
case SIOCSIFMETRIC:
error = suser_td(td);
if (error)
return (error);
ifp->if_metric = ifr->ifr_metric;
getmicrotime(&ifp->if_lastchange);
break;
case SIOCSIFPHYS:
error = suser_td(td);
if (error)
return error;
if (!ifp->if_ioctl)
return EOPNOTSUPP;
error = (*ifp->if_ioctl)(ifp, cmd, data);
if (error == 0)
getmicrotime(&ifp->if_lastchange);
return(error);
case SIOCSIFMTU:
{
u_long oldmtu = ifp->if_mtu;
error = suser_td(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);
error = (*ifp->if_ioctl)(ifp, cmd, data);
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(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(td);
if (error)
return (error);
if (ifp->if_ioctl == NULL)
return (EOPNOTSUPP);
error = (*ifp->if_ioctl)(ifp, cmd, data);
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 == 0)
return (EOPNOTSUPP);
error = (*ifp->if_ioctl)(ifp, cmd, data);
break;
case SIOCSIFLLADDR:
error = suser_td(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(so, cmd, data, td)
struct socket *so;
u_long cmd;
caddr_t data;
struct thread *td;
{
struct ifnet *ifp;
struct ifreq *ifr;
int error;
short 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(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: temporal 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(ifp, pswitch)
struct ifnet *ifp;
int pswitch;
{
struct ifreq ifr;
int error;
int oldflags, oldpcount;
oldpcount = ifp->if_pcount;
oldflags = ifp->if_flags;
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;
error = (*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, (caddr_t)&ifr);
if (error == 0) {
log(LOG_INFO, "%s%d: promiscuous mode %s\n",
ifp->if_name, ifp->if_unit,
(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(cmd, data)
u_long cmd;
caddr_t data;
{
struct ifconf *ifc = (struct ifconf *)data;
struct ifnet *ifp;
struct ifaddr *ifa;
struct ifreq ifr, *ifrp;
int space = ifc->ifc_len, error = 0;
ifrp = ifc->ifc_req;
TAILQ_FOREACH(ifp, &ifnet, if_link) {
char workbuf[64];
int ifnlen, addrs;
if (space < sizeof(ifr))
break;
ifnlen = snprintf(workbuf, sizeof(workbuf),
"%s%d", ifp->if_name, ifp->if_unit);
if(ifnlen + 1 > sizeof ifr.ifr_name) {
error = ENAMETOOLONG;
break;
} else {
strcpy(ifr.ifr_name, workbuf);
}
addrs = 0;
TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
struct sockaddr *sa = ifa->ifa_addr;
if (space < sizeof(ifr))
break;
if (jailed(curproc->p_ucred) &&
prison_if(curproc->p_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;
error = copyout((caddr_t)&ifr, (caddr_t)ifrp,
sizeof (ifr));
ifrp++;
} else
#endif
if (sa->sa_len <= sizeof(*sa)) {
ifr.ifr_addr = *sa;
error = copyout((caddr_t)&ifr, (caddr_t)ifrp,
sizeof (ifr));
ifrp++;
} else {
if (space < sizeof (ifr) + sa->sa_len -
sizeof(*sa))
break;
space -= sa->sa_len - sizeof(*sa);
error = copyout((caddr_t)&ifr, (caddr_t)ifrp,
sizeof (ifr.ifr_name));
if (error == 0)
error = copyout((caddr_t)sa,
(caddr_t)&ifrp->ifr_addr, sa->sa_len);
ifrp = (struct ifreq *)
(sa->sa_len + (caddr_t)&ifrp->ifr_addr);
}
if (error)
break;
space -= sizeof (ifr);
}
if (error)
break;
if (!addrs) {
bzero((caddr_t)&ifr.ifr_addr, sizeof(ifr.ifr_addr));
error = copyout((caddr_t)&ifr, (caddr_t)ifrp,
sizeof (ifr));
if (error)
break;
space -= sizeof (ifr);
ifrp++;
}
}
ifc->ifc_len -= space;
return (error);
}
/*
* Just like if_promisc(), but for all-multicast-reception mode.
*/
int
if_allmulti(ifp, onswitch)
struct ifnet *ifp;
int onswitch;
{
int error = 0;
int s = splimp();
if (onswitch) {
if (ifp->if_amcount++ == 0) {
ifp->if_flags |= IFF_ALLMULTI;
error = ifp->if_ioctl(ifp, SIOCSIFFLAGS, 0);
}
} else {
if (ifp->if_amcount > 1) {
ifp->if_amcount--;
} else {
ifp->if_amcount = 0;
ifp->if_flags &= ~IFF_ALLMULTI;
error = ifp->if_ioctl(ifp, SIOCSIFFLAGS, 0);
}
}
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(ifp, sa, retifma)
struct ifnet *ifp; /* interface to manipulate */
struct sockaddr *sa; /* address to add */
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);
*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_ifp = ifp;
ifma->ifma_refcount = 1;
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();
ifp->if_ioctl(ifp, SIOCADDMULTI, 0);
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(ifp, sa)
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)
ifp->if_ioctl(ifp, SIOCDELMULTI, 0);
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);
ifp->if_ioctl(ifp, SIOCDELMULTI, 0);
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;
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, ((struct arpcom *)ifp->if_softc)->ac_enaddr, len);
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) {
ifp->if_flags &= ~IFF_UP;
(*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, NULL);
ifp->if_flags |= IFF_UP;
(*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, NULL);
}
return (0);
}
struct ifmultiaddr *
ifmaof_ifpforaddr(sa, ifp)
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;
}
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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