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82e4a377a3
freebsd-skq/sys/net/if.c
wpaul 82e4a377a3 Implement SIOCSIFLLADDR, which allows you to change the link-level 
address on an interface. This basically allows you to do what my
little setmac module/utility does via ifconfig. This involves the
following changes:

socket.h: define SIOCSIFLLADDR
if.c: add support for SIOCSIFLLADDR, which resets the values in
      the arpcom struct and sockaddr_dl for the specified interface.
      Note that if the interface is already up, we need to down/up
      it in order to program the underlying hardware's receive filter.
ifconfig.c: add lladdr command
ifconfig.8: document lladdr command

You can now force the MAC address on any ethernet interface to be
whatever you want. (The change is not sticky across reboots of course:
we don't actually reprogram the EEPROM or anything.) Actually, you
can reprogram the MAC address on other kinds of interfaces too; this
shouldn't be ethernet-specific (though at the moment it's limited to
6 bytes of address data).

Nobody ran up to me and said "this is the politically correct way to
do this!" so I don't want to hear any complaints from people who think
I could have done it more elegantly. Consider yourselves lucky I didn't
do it by having ifconfig tread all over /dev/kmem.
2000-06-16 20:14:43 +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.
* 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 8.3 (Berkeley) 1/4/94
* $FreeBSD$
*/
#include "opt_compat.h"
#include "opt_inet6.h"
#include "opt_inet.h"
#include <sys/param.h>
#include <sys/malloc.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 <net/if.h>
#include <net/if_arp.h>
#include <net/if_dl.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 <machine/clock.h> /* XXX: temporal workaround for fxp issue */
#endif
#endif
/*
* System initialization
*/
static int ifconf __P((u_long, caddr_t));
static void ifinit __P((void *));
static void if_qflush __P((struct ifqueue *));
static void if_slowtimo __P((void *));
static void link_rtrequest __P((int, struct rtentry *, struct sockaddr *));
static int if_rtdel __P((struct radix_node *, void *));
SYSINIT(interfaces, SI_SUB_PROTO_IF, SI_ORDER_FIRST, ifinit, NULL)
MALLOC_DEFINE(M_IFADDR, "ifaddr", "interface address");
MALLOC_DEFINE(M_IFMADDR, "ether_multi", "link-level multicast address");
int ifqmaxlen = IFQ_MAXLEN;
struct ifnethead ifnet; /* depend on static init XXX */
#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
/*
* Network interface utility routines.
*
* Routines with ifa_ifwith* names take sockaddr *'s as
* parameters.
*/
/* ARGSUSED*/
void
ifinit(dummy)
void *dummy;
{
struct ifnet *ifp;
int s;
s = splimp();
for (ifp = ifnet.tqh_first; ifp; ifp = ifp->if_link.tqe_next)
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;
}
splx(s);
if_slowtimo(0);
}
int if_index = 0;
struct ifaddr **ifnet_addrs;
struct ifnet **ifindex2ifnet = NULL;
/*
* 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;
static int if_indexlim = 8;
static int inited;
if (!inited) {
TAILQ_INIT(&ifnet);
inited = 1;
}
TAILQ_INSERT_TAIL(&ifnet, ifp, if_link);
ifp->if_index = ++if_index;
/*
* 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);
LIST_INIT(&ifp->if_multiaddrs);
getmicrotime(&ifp->if_lastchange);
if (ifnet_addrs == 0 || if_index >= if_indexlim) {
unsigned n = (if_indexlim <<= 1) * sizeof(ifa);
caddr_t q = malloc(n, M_IFADDR, M_WAITOK);
bzero(q, n);
if (ifnet_addrs) {
bcopy((caddr_t)ifnet_addrs, (caddr_t)q, n/2);
free((caddr_t)ifnet_addrs, M_IFADDR);
}
ifnet_addrs = (struct ifaddr **)q;
/* grow ifindex2ifnet */
n = if_indexlim * sizeof(struct ifnet *);
q = malloc(n, M_IFADDR, M_WAITOK);
bzero(q, n);
if (ifindex2ifnet) {
bcopy((caddr_t)ifindex2ifnet, q, n/2);
free((caddr_t)ifindex2ifnet, M_IFADDR);
}
ifindex2ifnet = (struct ifnet **)q;
}
ifindex2ifnet[if_index] = ifp;
/*
* 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);
if (ifa) {
bzero((caddr_t)ifa, ifasize);
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;
ifnet_addrs[if_index - 1] = 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);
}
}
/*
* 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 ifnet_addrs[] and maybe decrement if_index.
* Clean up all addresses.
*/
ifnet_addrs[ifp->if_index - 1] = 0;
while (if_index > 0 && ifnet_addrs[if_index - 1] == 0)
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
/* XXX: Ugly!! ad hoc just for INET6 */
if (ifa->ifa_addr && ifa->ifa_addr->sa_family == AF_INET6) {
struct in6_aliasreq ifr;
bzero(&ifr, sizeof(ifr));
ifr.ifra_addr =
*((struct sockaddr_in6 *)ifa->ifa_addr);
if (ifa->ifa_dstaddr)
ifr.ifra_dstaddr =
*((struct sockaddr_in6 *)ifa->ifa_dstaddr);
if (in6_control(NULL, SIOCDIFADDR_IN6, (caddr_t)&ifr,
ifp, NULL) == 0)
continue;
}
#endif /* INET6 */
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;
(void) rnh->rnh_walktree(rnh, if_rtdel, ifp);
}
TAILQ_REMOVE(&ifnet, ifp, if_link);
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);
}
/*
* Locate an interface based on a complete address.
*/
/*ARGSUSED*/
struct ifaddr *
ifa_ifwithaddr(addr)
register struct sockaddr *addr;
{
register struct ifnet *ifp;
register struct ifaddr *ifa;
#define equal(a1, a2) \
(bcmp((caddr_t)(a1), (caddr_t)(a2), ((struct sockaddr *)(a1))->sa_len) == 0)
for (ifp = ifnet.tqh_first; ifp; ifp = ifp->if_link.tqe_next)
for (ifa = ifp->if_addrhead.tqh_first; ifa;
ifa = ifa->ifa_link.tqe_next) {
if (ifa->ifa_addr->sa_family != addr->sa_family)
continue;
if (equal(addr, ifa->ifa_addr))
return (ifa);
if ((ifp->if_flags & IFF_BROADCAST) && ifa->ifa_broadaddr &&
/* IP6 doesn't have broadcast */
ifa->ifa_broadaddr->sa_len != 0 &&
equal(ifa->ifa_broadaddr, addr))
return (ifa);
}
return ((struct ifaddr *)0);
}
/*
* Locate the point to point interface with a given destination address.
*/
/*ARGSUSED*/
struct ifaddr *
ifa_ifwithdstaddr(addr)
register struct sockaddr *addr;
{
register struct ifnet *ifp;
register struct ifaddr *ifa;
for (ifp = ifnet.tqh_first; ifp; ifp = ifp->if_link.tqe_next)
if (ifp->if_flags & IFF_POINTOPOINT)
for (ifa = ifp->if_addrhead.tqh_first; ifa;
ifa = ifa->ifa_link.tqe_next) {
if (ifa->ifa_addr->sa_family != addr->sa_family)
continue;
if (ifa->ifa_dstaddr && equal(addr, ifa->ifa_dstaddr))
return (ifa);
}
return ((struct ifaddr *)0);
}
/*
* 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 (ifnet_addrs[sdl->sdl_index - 1]);
}
/*
* Scan though each interface, looking for ones that have
* addresses in this address family.
*/
for (ifp = ifnet.tqh_first; ifp; ifp = ifp->if_link.tqe_next) {
for (ifa = ifp->if_addrhead.tqh_first; ifa;
ifa = ifa->ifa_link.tqe_next) {
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))
return (ifa);
} 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)) {
return (ifa);
} else {
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;
}
}
}
return (ifa_maybe);
}
/*
* 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);
for (ifa = ifp->if_addrhead.tqh_first; ifa;
ifa = ifa->ifa_link.tqe_next) {
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)))
return (ifa);
continue;
}
if (ifp->if_flags & IFF_POINTOPOINT) {
if (equal(addr, ifa->ifa_dstaddr))
return (ifa);
} 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)
return (ifa);
}
}
return (ifa_maybe);
}
#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, sa)
int cmd;
register struct rtentry *rt;
struct sockaddr *sa;
{
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, sa);
}
}
/*
* 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();
for (ifp = ifnet.tqh_first; ifp; ifp = ifp->if_link.tqe_next) {
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(char *name)
{
char namebuf[IFNAMSIZ + 1];
char *cp;
struct ifnet *ifp;
int unit;
unsigned len, m;
char c;
len = strlen(name);
if (len < 2 || len > IFNAMSIZ)
return NULL;
cp = name + len - 1;
c = *cp;
if (c < '0' || c > '9')
return NULL; /* trailing garbage */
unit = 0;
m = 1;
do {
if (cp == name)
return NULL; /* no interface name */
unit += (c - '0') * m;
if (unit > 1000000)
return NULL; /* number is unreasonable */
m *= 10;
c = *--cp;
} while (c >= '0' && c <= '9');
len = cp - name + 1;
bcopy(name, namebuf, len);
namebuf[len] = '\0';
/*
* Now search all the interfaces for this name/number
*/
for (ifp = ifnet.tqh_first; ifp; ifp = ifp->if_link.tqe_next) {
if (strcmp(ifp->if_name, namebuf))
continue;
if (unit == ifp->if_unit)
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);
}
/*
* Interface ioctls.
*/
int
ifioctl(so, cmd, data, p)
struct socket *so;
u_long cmd;
caddr_t data;
struct proc *p;
{
register struct ifnet *ifp;
register struct ifreq *ifr;
register struct ifaddr *ifa;
struct sockaddr_dl *sdl;
struct ifstat *ifs;
int error;
short oif_flags;
switch (cmd) {
case SIOCGIFCONF:
case OSIOCGIFCONF:
return (ifconf(cmd, data));
}
ifr = (struct ifreq *)data;
ifp = ifunit(ifr->ifr_name);
if (ifp == 0)
return (ENXIO);
switch (cmd) {
case SIOCGIFFLAGS:
ifr->ifr_flags = ifp->if_flags;
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(p);
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 SIOCSIFMETRIC:
error = suser(p);
if (error)
return (error);
ifp->if_metric = ifr->ifr_metric;
getmicrotime(&ifp->if_lastchange);
break;
case SIOCSIFPHYS:
error = suser(p);
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(p);
if (error)
return (error);
if (ifp->if_ioctl == NULL)
return (EOPNOTSUPP);
if (ifr->ifr_mtu < IF_MINMTU || ifr->ifr_mtu > IF_MAXMTU)
return (EINVAL);
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
}
return (error);
}
case SIOCADDMULTI:
case SIOCDELMULTI:
error = suser(p);
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);
return error;
case SIOCSIFMEDIA:
case SIOCSIFGENERIC:
error = suser(p);
if (error)
return (error);
if (ifp->if_ioctl == 0)
return (EOPNOTSUPP);
error = (*ifp->if_ioctl)(ifp, cmd, data);
if (error == 0)
getmicrotime(&ifp->if_lastchange);
return error;
case SIOCGIFSTATUS:
ifs = (struct ifstat *)data;
ifs->ascii[0] = '\0';
case SIOCGIFMEDIA:
case SIOCGIFGENERIC:
if (ifp->if_ioctl == 0)
return (EOPNOTSUPP);
return ((*ifp->if_ioctl)(ifp, cmd, data));
case SIOCSIFLLADDR:
error = suser(p);
if (error)
return (error);
ifa = ifnet_addrs[ifp->if_index - 1];
if (ifa == NULL)
return(EINVAL);
sdl = (struct sockaddr_dl *)ifa->ifa_addr;
if (sdl == NULL)
return(EINVAL);
bcopy(ifr->ifr_addr.sa_data,
((struct arpcom *)ifp->if_softc)->ac_enaddr,
ifr->ifr_addr.sa_len);
bcopy(ifr->ifr_addr.sa_data, LLADDR(sdl),
ifr->ifr_addr.sa_len);
/*
* 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) {
ifp->if_flags &= ~IFF_UP;
(*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, NULL);
ifp->if_flags |= IFF_UP;
(*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, NULL);
}
return(0);
default:
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, p));
#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, p));
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);
}
return (0);
}
/*
* 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;
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;
log(LOG_INFO, "%s%d: promiscuous mode enabled\n",
ifp->if_name, ifp->if_unit);
} else {
if (--ifp->if_pcount > 0)
return (0);
ifp->if_flags &= ~IFF_PROMISC;
log(LOG_INFO, "%s%d: promiscuous mode disabled\n",
ifp->if_name, ifp->if_unit);
}
ifr.ifr_flags = ifp->if_flags;
error = (*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, (caddr_t)&ifr);
if (error == 0)
rt_ifmsg(ifp);
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;
{
register struct ifconf *ifc = (struct ifconf *)data;
register struct ifnet *ifp = ifnet.tqh_first;
register struct ifaddr *ifa;
struct ifreq ifr, *ifrp;
int space = ifc->ifc_len, error = 0;
ifrp = ifc->ifc_req;
for (; space > sizeof (ifr) && ifp; ifp = ifp->if_link.tqe_next) {
char workbuf[64];
int ifnlen, addrs;
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;
ifa = ifp->if_addrhead.tqh_first;
for ( ; space > sizeof (ifr) && ifa;
ifa = ifa->ifa_link.tqe_next) {
register struct sockaddr *sa = ifa->ifa_addr;
if (curproc->p_prison && prison_if(curproc, 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
*/
for (ifma = ifp->if_multiaddrs.lh_first; ifma;
ifma = ifma->ifma_link.le_next) {
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();
LIST_INSERT_HEAD(&ifp->if_multiaddrs, ifma, ifma_link);
splx(s);
*retifma = ifma;
if (llsa != 0) {
for (ifma = ifp->if_multiaddrs.lh_first; ifma;
ifma = ifma->ifma_link.le_next) {
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();
LIST_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;
for (ifma = ifp->if_multiaddrs.lh_first; ifma;
ifma = ifma->ifma_link.le_next)
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();
LIST_REMOVE(ifma, ifma_link);
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.)
*/
for (ifma = ifp->if_multiaddrs.lh_first; ifma;
ifma = ifma->ifma_link.le_next)
if (equal(sa, ifma->ifma_addr))
break;
if (ifma == 0)
return 0;
if (ifma->ifma_refcount > 1) {
ifma->ifma_refcount--;
return 0;
}
s = splimp();
LIST_REMOVE(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;
}
struct ifmultiaddr *
ifmaof_ifpforaddr(sa, ifp)
struct sockaddr *sa;
struct ifnet *ifp;
{
struct ifmultiaddr *ifma;
for (ifma = ifp->if_multiaddrs.lh_first; ifma;
ifma = ifma->ifma_link.le_next)
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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