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SubjectRe: [PATCH] e1000, e1000e valid-addr fixes
David Miller wrote:
> From: Jeff Garzik <jeff@garzik.org>
> Date: Tue, 23 Oct 2007 21:03:36 -0400
>
>> I'm wondering if there is a way to avoid adding
>>
>> if (!is_valid_ether_addr(dev->dev_addr))
>> return -EINVAL;
>>
>> to every ethernet driver's ->open() hook.
>
> The first idea I get is:
>
> 1) Create netdev->validate_dev_addr().
>
> 2) If it exists, invoke it before ->open(), abort
> and return if any errors signaled.
>
> etherdev init hooks up a function that does the above
> check, which allows us to avoid editing every ethernet
> driver
>
> What do you think?

Seems sane to me. Something like this (attached)?

Jeff



diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index 4a3f54e..962d1de 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -669,6 +669,8 @@ struct net_device
#define HAVE_SET_MAC_ADDR
int (*set_mac_address)(struct net_device *dev,
void *addr);
+#define HAVE_VALIDATE_ADDR
+ int (*validate_addr)(struct net_device *dev);
#define HAVE_PRIVATE_IOCTL
int (*do_ioctl)(struct net_device *dev,
struct ifreq *ifr, int cmd);
diff --git a/net/core/dev.c b/net/core/dev.c
index 8726589..f861555 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -1007,17 +1007,20 @@ int dev_open(struct net_device *dev)
* Call device private open method
*/
set_bit(__LINK_STATE_START, &dev->state);
- if (dev->open) {
+
+ if (dev->validate_addr)
+ ret = dev->validate_addr(dev);
+
+ if (!ret && dev->open)
ret = dev->open(dev);
- if (ret)
- clear_bit(__LINK_STATE_START, &dev->state);
- }

/*
* If it went open OK then:
*/

- if (!ret) {
+ if (ret)
+ clear_bit(__LINK_STATE_START, &dev->state);
+ else {
/*
* Set the flags.
*/
@@ -1038,6 +1041,7 @@ int dev_open(struct net_device *dev)
*/
call_netdevice_notifiers(NETDEV_UP, dev);
}
+
return ret;
}

diff --git a/net/ethernet/eth.c b/net/ethernet/eth.c
index ed8a3d4..5471cd2 100644
--- a/net/ethernet/eth.c
+++ b/net/ethernet/eth.c
@@ -298,6 +298,14 @@ static int eth_change_mtu(struct net_device *dev, int new_mtu)
return 0;
}

+static int eth_validate_addr(struct net_device *dev)
+{
+ if (!is_valid_ether_addr(dev->dev_addr))
+ return -EINVAL;
+
+ return 0;
+}
+
const struct header_ops eth_header_ops ____cacheline_aligned = {
.create = eth_header,
.parse = eth_header_parse,
@@ -317,6 +325,7 @@ void ether_setup(struct net_device *dev)

dev->change_mtu = eth_change_mtu;
dev->set_mac_address = eth_mac_addr;
+ dev->validate_addr = eth_validate_addr;

dev->type = ARPHRD_ETHER;
dev->hard_header_len = ETH_HLEN;
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