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freebsd-nq/sys/net/if.c
Brooks Davis f889d2ef8d Major overhaul of pseudo-interface cloning. Highlights include: 
- Split the code out into if_clone.[ch].
 - Locked struct if_clone. [1]
 - Add a per-cloner match function rather then simply matching names of
   the form <name><unit> and <name>.
 - Use the match function to allow creation of <interface>.<tag>
   vlan interfaces.  The old way is preserved unchanged!
 - Also the match function to allow creation of stf(4) interfaces named
   stf0, stf, or 6to4.  This is the only major user visible change in
   that "ifconfig stf" creates the interface stf rather then stf0 and
   does not print "stf0" to stdout.
 - Allow destroy functions to fail so they can refuse to delete
   interfaces.  Currently, we forbid the deletion of interfaces which
   were created in the init function, particularly lo0, pflog0, and
   pfsync0.  In the case of lo0 this was a panic implementation so it
   does not count as a user visiable change. :-)
 - Since most interfaces do not need the new functionality, an family of
   wrapper functions, ifc_simple_*(), were created to wrap old style
   cloner functions.
 - The IF_CLONE_INITIALIZER macro is replaced with a new incompatible
   IFC_CLONE_INITIALIZER and ifc_simple consumers use IFC_SIMPLE_DECLARE
   instead.

Submitted by:   Maurycy Pawlowski-Wieronski <maurycy at fouk.org> [1]
Reviewed by:    andre, mlaier
Discussed on:	net
2004-06-22 20:13:25 +00:00

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/*
* 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/conf.h>
#include <sys/mac.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/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
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 *);
#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 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");
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 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(void *dummy __unused)
{
IFNET_LOCK_INIT();
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");
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;
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);
SLIST_INIT(&ifp->if_klist);
getmicrotime(&ifp->if_lastchange);
#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();
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 = 0; /* 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 (domains)
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_FIRST,
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) {
IF_AFDATA_UNLOCK(ifp);
splx(s);
return;
}
ifp->if_afdata_initialized = 1;
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;
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.
*/
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. */
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(&ifp->if_klist, NOTE_EXIT);
IFNET_WLOCK();
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
}
/*
* 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;
#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;
}
/*
* 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(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)
(void) (*ifp->if_ioctl)(ifp, cmd, data);
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);
error = (*ifp->if_ioctl)(ifp, cmd, data);
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);
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);
error = (*ifp->if_ioctl)(ifp, cmd, data);
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);
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);
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);
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 == NULL)
return (EOPNOTSUPP);
error = (*ifp->if_ioctl)(ifp, cmd, data);
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;
error = (*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, (caddr_t)&ifr);
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, *ifrp;
int space = ifc->ifc_len, error = 0;
ifrp = ifc->ifc_req;
IFNET_RLOCK(); /* could sleep XXX */
TAILQ_FOREACH(ifp, &ifnet, if_link) {
int addrs;
if (space < sizeof(ifr))
break;
if (strlcpy(ifr.ifr_name, ifp->if_xname, sizeof(ifr.ifr_name))
>= sizeof(ifr.ifr_name)) {
error = ENAMETOOLONG;
break;
}
addrs = 0;
TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
struct sockaddr *sa = ifa->ifa_addr;
if (space < sizeof(ifr))
break;
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;
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++;
}
}
IFNET_RUNLOCK();
ifc->ifc_len -= space;
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;
error = ifp->if_ioctl(ifp, SIOCSIFFLAGS, (caddr_t)&ifr);
}
} 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;
error = ifp->if_ioctl(ifp, SIOCSIFFLAGS, (caddr_t)&ifr);
}
}
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();
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(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;
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) {
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);
#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);
}
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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