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.
This commit is contained in:
parent
8f76bcf052
commit
b106252c19
Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=61734
@ -189,6 +189,16 @@ This action does not automatically disable routes using the interface.
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.\" IP encapsulation of
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.\" .Tn CLNP
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.\" packets is done differently.
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.It Cm lladdr Ar addr
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Set the link-level address on an interface. This can be used to
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e.g. set a new MAC address on an ethernet interface, though the
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mechanism used is not ethernet-specific. The address
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.Ar addr
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is specified as a series of colon-separated hex digits.
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If the interface is already
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up when this option is used, it will be briefly brought down and
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then brought back up again in order to insure that the receive
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filter in the underlying ethernet hardware is properly reprogrammed.
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.It Cm media Ar type
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If the driver supports the media selection system, set the media type
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of the interface to
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@ -53,6 +53,7 @@ static const char rcsid[] =
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#include <sys/module.h>
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#include <sys/linker.h>
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#include <net/ethernet.h>
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#include <net/if.h>
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#include <net/if_var.h>
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#include <net/if_dl.h>
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@ -153,7 +154,7 @@ c_func setifprefixlen;
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c_func setip6flags;
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#endif
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c_func setifipdst;
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c_func setifflags, setifmetric, setifmtu;
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c_func setifflags, setifmetric, setifmtu, setiflladdr;
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#define NEXTARG 0xffffff
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@ -212,6 +213,7 @@ struct cmd {
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{ "compress", IFF_LINK0, setifflags },
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{ "noicmp", IFF_LINK1, setifflags },
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{ "mtu", NEXTARG, setifmtu },
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{ "lladdr", NEXTARG, setiflladdr },
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{ 0, 0, setifaddr },
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{ 0, 0, setifdstaddr },
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};
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@ -815,6 +817,29 @@ setifmtu(val, dummy, s, afp)
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warn("ioctl (set mtu)");
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}
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void
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setiflladdr(val, dummy, s, afp)
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const char *val;
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int dummy __unused;
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int s;
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const struct afswtch *afp;
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{
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struct ether_addr *ea;
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ea = ether_aton(val);
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if (ea == NULL) {
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warn("malformed link-level address");
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return;
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}
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strncpy(ifr.ifr_name, name, sizeof (ifr.ifr_name));
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ifr.ifr_addr.sa_len = ETHER_ADDR_LEN;
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ifr.ifr_addr.sa_family = AF_LINK;
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bcopy(ea, ifr.ifr_addr.sa_data, ETHER_ADDR_LEN);
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if (ioctl(s, SIOCSIFLLADDR, (caddr_t)&ifr) < 0)
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warn("ioctl (set lladdr)");
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return;
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}
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#define IFFBITS \
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"\020\1UP\2BROADCAST\3DEBUG\4LOOPBACK\5POINTOPOINT\6SMART\7RUNNING" \
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30
sys/net/if.c
30
sys/net/if.c
@ -52,6 +52,7 @@
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#include <sys/sysctl.h>
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#include <net/if.h>
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#include <net/if_arp.h>
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#include <net/if_dl.h>
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#include <net/radix.h>
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#include <net/route.h>
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@ -763,6 +764,8 @@ ifioctl(so, cmd, data, p)
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{
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register struct ifnet *ifp;
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register struct ifreq *ifr;
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register struct ifaddr *ifa;
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struct sockaddr_dl *sdl;
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struct ifstat *ifs;
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int error;
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short oif_flags;
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@ -912,6 +915,33 @@ ifioctl(so, cmd, data, p)
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return (EOPNOTSUPP);
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return ((*ifp->if_ioctl)(ifp, cmd, data));
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case SIOCSIFLLADDR:
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error = suser(p);
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if (error)
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return (error);
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ifa = ifnet_addrs[ifp->if_index - 1];
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if (ifa == NULL)
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return(EINVAL);
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sdl = (struct sockaddr_dl *)ifa->ifa_addr;
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if (sdl == NULL)
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return(EINVAL);
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bcopy(ifr->ifr_addr.sa_data,
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((struct arpcom *)ifp->if_softc)->ac_enaddr,
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ifr->ifr_addr.sa_len);
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bcopy(ifr->ifr_addr.sa_data, LLADDR(sdl),
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ifr->ifr_addr.sa_len);
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/*
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* If the interface is already up, we need
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* to re-init it in order to reprogram its
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* address filter.
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*/
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if (ifp->if_flags & IFF_UP) {
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ifp->if_flags &= ~IFF_UP;
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(*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, NULL);
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ifp->if_flags |= IFF_UP;
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(*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, NULL);
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}
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return(0);
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default:
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oif_flags = ifp->if_flags;
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if (so->so_proto == 0)
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@ -94,5 +94,6 @@
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#define SIOCGIFGENERIC _IOWR('i', 58, struct ifreq) /* generic IF get op */
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#define SIOCGIFSTATUS _IOWR('i', 59, struct ifstat) /* get IF status */
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#define SIOCSIFLLADDR _IOW('i', 60, struct ifreq) /* set link level addr */
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#endif /* !_SYS_SOCKIO_H_ */
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