--- a/include/linux/if.h 2008-09-22 11:54:10.000000000 -0700
+++ b/include/linux/if.h 2008-09-22 16:22:24.000000000 -0700
@@ -24,6 +24,7 @@
#include <linux/compiler.h> /* for "__user" et al */
#define IFNAMSIZ 16
+#define IFALIASZ 256
#include <linux/hdlc/ioctl.h>
/* Standard interface flags (netdevice->flags). */
--- a/include/linux/if_link.h 2008-09-22 11:50:28.000000000 -0700
+++ b/include/linux/if_link.h 2008-09-22 11:54:32.000000000 -0700
@@ -79,6 +79,7 @@ enum
IFLA_LINKINFO,
#define IFLA_LINKINFO IFLA_LINKINFO
IFLA_NET_NS_PID,
+ IFLA_IFALIAS,
__IFLA_MAX
};
--- a/include/linux/netdevice.h 2008-09-22 11:46:10.000000000 -0700
+++ b/include/linux/netdevice.h 2008-09-22 16:04:24.000000000 -0700
@@ -471,6 +471,8 @@ struct net_device
char name[IFNAMSIZ];
/* device name hash chain */
struct hlist_node name_hlist;
+ /* snmp alias */
+ char *ifalias;
/*
* I/O specific fields
@@ -1224,6 +1226,7 @@ extern int dev_ethtool(struct net *net,
extern unsigned dev_get_flags(const struct net_device *);
extern int dev_change_flags(struct net_device *, unsigned);
extern int dev_change_name(struct net_device *, char *);
+extern int dev_set_alias(struct net_device *, const char *, size_t);
extern int dev_change_net_namespace(struct net_device *,
struct net *, const char *);
extern int dev_set_mtu(struct net_device *, int);
--- a/net/core/dev.c 2008-09-22 11:58:17.000000000 -0700
+++ b/net/core/dev.c 2008-09-22 17:26:57.000000000 -0700
@@ -954,6 +954,29 @@ rollback:
}
/**
+ * dev_set_alias - change ifalias of a device
+ * @dev: device
+ * @alias: name up to IFALIASZ
+ *
+ * Set ifalias for a device,
+ */
+int dev_set_alias(struct net_device *dev, const char *alias, size_t len)
+{
+ ASSERT_RTNL();
+
+ if (len >= IFALIASZ)
+ return -EINVAL;
+
+ dev->ifalias = krealloc(dev->ifalias, len+1, GFP_KERNEL);
+ if (!dev->ifalias)
+ return -ENOMEM;
+
+ strlcpy(dev->ifalias, alias, len+1);
+ return len;
+}
+
+
+/**
* netdev_features_change - device changes features
* @dev: device to cause notification
*
--- a/net/core/net-sysfs.c 2008-09-22 12:03:34.000000000 -0700
+++ b/net/core/net-sysfs.c 2008-09-22 17:27:14.000000000 -0700@@ -209,9 +209,44 @@ static ssize_t store_tx_queue_len(struct
return netdev_store(dev, attr, buf, len, change_tx_queue_len);
}
+static ssize_t store_ifalias(struct device *dev, struct device_attribute *attr,
+ const char *buf, size_t len)
+{
+ struct net_device *netdev = to_net_dev(dev);
+ size_t count = len;
+ ssize_t ret;
+
+ if (!capable(CAP_NET_ADMIN))
+ return -EPERM;
+
+ /* ignore trailing newline */
+ if (len > 0 && buf[len - 1] == '\n')
+ --count;
+
+ rtnl_lock();
+ ret = dev_set_alias(netdev, buf, count);
+ rtnl_unlock();
+
+ return ret < 0 ? ret : len;
+}
+
+static ssize_t show_ifalias(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ const struct net_device *netdev = to_net_dev(dev);
+ ssize_t ret = 0;
+
+ rtnl_lock();
+ if (netdev->ifalias)
+ ret = sprintf(buf, "%s\n", netdev->ifalias);
+ rtnl_unlock();
+ return ret;
+}
+
static struct device_attribute net_class_attributes[] = {
__ATTR(addr_len, S_IRUGO, show_addr_len, NULL),
__ATTR(dev_id, S_IRUGO, show_dev_id, NULL),
+ __ATTR(ifalias, S_IRUGO | S_IWUSR, show_ifalias, store_ifalias),
__ATTR(iflink, S_IRUGO, show_iflink, NULL),
__ATTR(ifindex, S_IRUGO, show_ifindex, NULL),
__ATTR(features, S_IRUGO, show_features, NULL),@@ -418,6 +453,7 @@ static void netdev_release(struct device
BUG_ON(dev->reg_state != NETREG_RELEASED);
+ kfree(dev->ifalias);
kfree((char *)dev - dev->padded);
}
--- a/net/core/rtnetlink.c 2008-09-22 11:48:30.000000000 -0700
+++ b/net/core/rtnetlink.c 2008-09-22 16:23:56.000000000 -0700
@@ -586,6 +586,7 @@ static inline size_t if_nlmsg_size(const
{
return NLMSG_ALIGN(sizeof(struct ifinfomsg))
+ nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
+ + nla_total_size(IFALIASZ) /* IFLA_IFALIAS */
+ nla_total_size(IFNAMSIZ) /* IFLA_QDISC */
+ nla_total_size(sizeof(struct rtnl_link_ifmap))
+ nla_total_size(sizeof(struct rtnl_link_stats))@@ -640,6 +641,9 @@ static int rtnl_fill_ifinfo(struct sk_bu
if (txq->qdisc_sleeping)
NLA_PUT_STRING(skb, IFLA_QDISC, txq->qdisc_sleeping->ops->id);
+ if (dev->ifalias)
+ NLA_PUT_STRING(skb, IFLA_IFALIAS, dev->ifalias);
+
if (1) {
struct rtnl_link_ifmap map = {
.mem_start = dev->mem_start,@@ -713,6 +717,7 @@ const struct nla_policy ifla_policy[IFLA
[IFLA_LINKMODE] = { .type = NLA_U8 },
[IFLA_LINKINFO] = { .type = NLA_NESTED },
[IFLA_NET_NS_PID] = { .type = NLA_U32 },
+ [IFLA_IFALIAS] = { .type = NLA_STRING, .len = IFALIASZ-1 },
};
static const struct nla_policy ifla_info_policy[IFLA_INFO_MAX+1] = {@@ -853,6 +858,14 @@ static int do_setlink(struct net_device
modified = 1;
}
+ if (tb[IFLA_IFALIAS]) {
+ err = dev_set_alias(dev, nla_data(tb[IFLA_IFALIAS]),
+ nla_len(tb[IFLA_IFALIAS]));
+ if (err < 0)
+ goto errout;
+ modified = 1;
+ }
+
if (tb[IFLA_BROADCAST]) {
nla_memcpy(dev->broadcast, tb[IFLA_BROADCAST], dev->addr_len);
send_addr_notify = 1;