diff options
author | wpaul <wpaul@FreeBSD.org> | 2000-06-16 20:14:43 +0000 |
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committer | wpaul <wpaul@FreeBSD.org> | 2000-06-16 20:14:43 +0000 |
commit | 82e4a377a336192df9c5242f53d08e055da24e00 (patch) | |
tree | f225e48869329753bc302bb25eb70daa24458634 /sbin/ifconfig/ifconfig.c | |
parent | f0880172c7dc6b2cfe0fe129d1d11ea81b53a287 (diff) | |
download | FreeBSD-src-82e4a377a336192df9c5242f53d08e055da24e00.zip FreeBSD-src-82e4a377a336192df9c5242f53d08e055da24e00.tar.gz |
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.
Diffstat (limited to 'sbin/ifconfig/ifconfig.c')
-rw-r--r-- | sbin/ifconfig/ifconfig.c | 27 |
1 files changed, 26 insertions, 1 deletions
diff --git a/sbin/ifconfig/ifconfig.c b/sbin/ifconfig/ifconfig.c index a3c75ca..52d403d 100644 --- a/sbin/ifconfig/ifconfig.c +++ b/sbin/ifconfig/ifconfig.c @@ -53,6 +53,7 @@ static const char rcsid[] = #include <sys/module.h> #include <sys/linker.h> +#include <net/ethernet.h> #include <net/if.h> #include <net/if_var.h> #include <net/if_dl.h> @@ -153,7 +154,7 @@ c_func setifprefixlen; c_func setip6flags; #endif c_func setifipdst; -c_func setifflags, setifmetric, setifmtu; +c_func setifflags, setifmetric, setifmtu, setiflladdr; #define NEXTARG 0xffffff @@ -212,6 +213,7 @@ struct cmd { { "compress", IFF_LINK0, setifflags }, { "noicmp", IFF_LINK1, setifflags }, { "mtu", NEXTARG, setifmtu }, + { "lladdr", NEXTARG, setiflladdr }, { 0, 0, setifaddr }, { 0, 0, setifdstaddr }, }; @@ -815,6 +817,29 @@ setifmtu(val, dummy, s, afp) warn("ioctl (set mtu)"); } +void +setiflladdr(val, dummy, s, afp) + const char *val; + int dummy __unused; + int s; + const struct afswtch *afp; +{ + struct ether_addr *ea; + + ea = ether_aton(val); + if (ea == NULL) { + warn("malformed link-level address"); + return; + } + strncpy(ifr.ifr_name, name, sizeof (ifr.ifr_name)); + ifr.ifr_addr.sa_len = ETHER_ADDR_LEN; + ifr.ifr_addr.sa_family = AF_LINK; + bcopy(ea, ifr.ifr_addr.sa_data, ETHER_ADDR_LEN); + if (ioctl(s, SIOCSIFLLADDR, (caddr_t)&ifr) < 0) + warn("ioctl (set lladdr)"); + + return; +} #define IFFBITS \ "\020\1UP\2BROADCAST\3DEBUG\4LOOPBACK\5POINTOPOINT\6SMART\7RUNNING" \ |