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Antoine Martin wrote:
> Jeff Dike wrote:
>> On Fri, Apr 27, 2007 at 04:21:11PM +0100, Antoine Martin wrote:
>>> Question remains as to why the mac address was the same until 2.6.20 and
>>> is now different.
>> We started providing randomized MACs at bootup instead of deriving
>> them from the IP when the interface was brought up. The old behavior
>> broke when distros started bringing interfaces up without assigning
>> IPs to them.
>
>>> Except, pcap doesn't have the option.
>> Hmmm that would be a problem.
> :)
> I've got a patch - coming soon (tm)
Attached.
Not sure which approach is best:
1) this one requires a command line like:
"vmlinux eth0=pcap,eth0,,mac=00:01:02:03:04:05"
- --- a/arch/um/drivers/pcap_kern.c 2007-02-04 18:44:54.000000000 +0000
+++ b/arch/um/drivers/pcap_kern.c 2007-04-27 17:40:15.000000000 +0100
@@ -15,6 +15,7 @@
int promisc;
int optimize;
char *filter;
+ char *mac;
};
void pcap_init(struct net_device *dev, void *data)
@@ -56,17 +57,18 @@
int pcap_setup(char *str, char **mac_out, void *data)
{
struct pcap_init *init = data;
- - char *remain, *host_if = NULL, *options[2] = { NULL, NULL };
+ char *remain, *host_if = NULL, *options[3] = { NULL, NULL, NULL };
int i;
*init = ((struct pcap_init)
{ .host_if = "eth0",
.promisc = 1,
.optimize = 0,
- - .filter = NULL });
+ .filter = NULL,
+ .mac = "00:00:00:00:00:00" });
remain = split_if_spec(str, &host_if, &init->filter,
- - &options[0], &options[1], NULL);
+ &options[0], &options[1], &options[2], NULL);
if(remain != NULL){
printk(KERN_ERR "pcap_setup - Extra garbage on "
"specification : '%s'\n", remain);
@@ -87,6 +89,10 @@
init->optimize = 1;
else if(!strcmp(options[i], "nooptimize"))
init->optimize = 0;
+ else if(!strncmp(options[i], "mac=", 4) &&
strlen(options[i])==21) {
+ strncpy(init->mac, options[i]+4, 17);
+ *mac_out = init->mac;
+ }
else printk("pcap_setup : bad option - '%s'\n", options[i]);
}
2) or this one: which just assumes that the mac address is any option
that isn't [no]promisc or [no]optimize and is 17 characters long (I
don't see much point in doing extra checks since this is check in
setup_ether_xx later on)
- --- /uml/kernels/src/linux-2.6.20.9-amd64/arch/um/drivers/pcap_kern.c
2007-02-04 18:44:54.000000000 +0000
+++ pcap_kern.c 2007-04-27 17:45:31.000000000 +0100
@@ -15,6 +15,7 @@
int promisc;
int optimize;
char *filter;
+ char *mac;
};
void pcap_init(struct net_device *dev, void *data)
@@ -56,17 +57,18 @@
int pcap_setup(char *str, char **mac_out, void *data)
{
struct pcap_init *init = data;
- - char *remain, *host_if = NULL, *options[2] = { NULL, NULL };
+ char *remain, *host_if = NULL, *options[3] = { NULL, NULL, NULL };
int i;
*init = ((struct pcap_init)
{ .host_if = "eth0",
.promisc = 1,
.optimize = 0,
- - .filter = NULL });
+ .filter = NULL,
+ .mac = "00:00:00:00:00:00" });
remain = split_if_spec(str, &host_if, &init->filter,
- - &options[0], &options[1], NULL);
+ &options[0], &options[1], &options[2], NULL);
if(remain != NULL){
printk(KERN_ERR "pcap_setup - Extra garbage on "
"specification : '%s'\n", remain);
@@ -87,6 +89,11 @@
init->optimize = 1;
else if(!strcmp(options[i], "nooptimize"))
init->optimize = 0;
+ else if(strlen(options[i])==17) {
+ //a mac address is always 17 characters long
+ strncpy(init->mac, options[i], 17);
+ *mac_out = init->mac;
+ }
else printk("pcap_setup : bad option - '%s'\n", options[i]);
}
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