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Message-Id: <1351012533-3524-2-git-send-email-p.pisati@gmail.com>
Date: Tue, 23 Oct 2012 19:15:28 +0200
From: Paolo Pisati <p.pisati@...il.com>
To: netdev@...r.kernel.org
Cc: Giuseppe Cavallaro <peppe.cavallaro@...com>,
Kristoffer Glembo <kristoffer@...sler.com>
Subject: [PATCH 1/6] macaddr kernel bootargs implementation
Signed-off-by: Paolo Pisati <p.pisati@...il.com>
---
Documentation/kernel-parameters.txt | 4 ++
net/core/dev.c | 101 +++++++++++++++++++++++++++++++++++
2 files changed, 105 insertions(+)
diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index 57dfe00..098beb6 100644
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -1382,6 +1382,10 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
ltpc= [NET]
Format: <io>,<irq>,<dma>
+ macaddr= [HW,NET]
+ Set NIC MAC address to given value.
+ Example: macaddr=eth0,00:11:22:33:44:55
+
machvec= [IA-64] Force the use of a particular machine-vector
(machvec) in a generic kernel.
Example: machvec=hpzx1_swiotlb
diff --git a/net/core/dev.c b/net/core/dev.c
index abe1147..5b3e125 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -598,6 +598,107 @@ int __init netdev_boot_setup(char *str)
__setup("netdev=", netdev_boot_setup);
+struct macaddr_data {
+ char ifname[IFNAMSIZ + 1];
+ struct sockaddr so;
+ struct list_head list;
+};
+
+static LIST_HEAD(macaddr_list);
+
+static int macaddr_device_event(struct notifier_block *unused,
+ unsigned long event, void *ptr)
+{
+ struct net_device *dev = ptr;
+ struct macaddr_data *ma;
+
+ if (event == NETDEV_REGISTER) {
+ list_for_each_entry(ma, &macaddr_list, list) {
+ if (strcmp(dev->name, ma->ifname) == 0) {
+ dev_set_mac_address(dev, &ma->so);
+ break;
+ }
+ }
+ }
+ return NOTIFY_DONE;
+}
+
+static struct notifier_block macaddr_notifier = {
+ .notifier_call = macaddr_device_event,
+};
+
+static int parse_macaddr(const char *macstr, struct sockaddr *so)
+{
+ int i, h, l;
+
+ for (i = 0; i < 6; i++) {
+ h = hex_to_bin(*macstr);
+ if (h == -1)
+ goto err;
+ macstr++;
+
+ l = hex_to_bin(*macstr);
+ if (l == -1)
+ goto err;
+ macstr++;
+
+ if (i != 5) {
+ if (*macstr != ':')
+ goto err;
+ macstr++;
+ }
+ so->sa_data[i] = (h << 4) + l;
+ }
+ if (is_valid_ether_addr(so->sa_data))
+ return 0;
+err:
+ return -EINVAL;
+}
+
+static int __init if_macaddr(void)
+{
+ char cmdline[] = "macaddr=", *str;
+ int err = -EINVAL, i;
+ struct macaddr_data *ma, *tmp;
+
+ str = boot_command_line;
+ while ((str = strstr(str, cmdline)) != NULL) {
+ ma = kmalloc(sizeof(struct macaddr_data), GFP_KERNEL);
+ if (ma == NULL) {
+ err = -ENOMEM;
+ goto out;
+ }
+
+ /*
+ * Parse input string, expected format: ethX,00:11:22:33:44:55
+ */
+ str += sizeof(cmdline) - 1;
+ for (i = 0; i <= IFNAMSIZ; i++, str++) {
+ if (*str == ' ' || *str == '\0')
+ goto out;
+ if (*str == ',')
+ break;
+ ma->ifname[i] = *str;
+ }
+ ma->ifname[++i] = '\0';
+ ma->so.sa_family = ARPHRD_ETHER;
+ if (parse_macaddr(++str, &ma->so))
+ goto out;
+
+ list_add_tail(&ma->list, &macaddr_list);
+ }
+
+ if (!list_empty(&macaddr_list))
+ register_netdevice_notifier(&macaddr_notifier);
+ return 0;
+out:
+ kfree(ma);
+ list_for_each_entry_safe(ma, tmp, &macaddr_list, list)
+ kfree(ma);
+ return err;
+}
+late_initcall(if_macaddr);
+
/*******************************************************************************
Device Interface Subroutines
--
1.7.9.5
--
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