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[RTNETLINK]: Introduce generic rtnl_create_link(). 

This routine gets the parsed rtnl attributes and creates a new
link with generic info (IFLA_LINKINFO policy). Its intention
is to help the drivers, that need to create several links at
once (like VETH).

This is nothing but a copy-paste-ed part of rtnl_newlink() function
that is responsible for creation of new device.

Signed-off-by: Pavel Emelianov <xemul@openvz.org>
Acked-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Pavel Emelianov 2007-08-08 22:16:38 -07:00 committed by David S. Miller
parent bea3348eef
commit e71992889e
2 changed files with 55 additions and 28 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
include/net/rtnetlink.h
View File

@ -78,6 +78,10 @@ extern void __rtnl_link_unregister(struct rtnl_link_ops *ops);
extern int rtnl_link_register(struct rtnl_link_ops *ops);
extern void rtnl_link_unregister(struct rtnl_link_ops *ops);
extern struct net_device *rtnl_create_link(char *ifname,
const struct rtnl_link_ops *ops, struct nlattr *tb[]);
extern const struct nla_policy ifla_policy[IFLA_MAX+1];
#define MODULE_ALIAS_RTNL_LINK(kind) MODULE_ALIAS("rtnl-link-" kind)
#endif

79
net/core/rtnetlink.c
View File

@ -713,7 +713,7 @@ cont:
return skb->len;
}
static const struct nla_policy ifla_policy[IFLA_MAX+1] = {
const struct nla_policy ifla_policy[IFLA_MAX+1] = {
[IFLA_IFNAME] = { .type = NLA_STRING, .len = IFNAMSIZ-1 },
[IFLA_ADDRESS] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN },
[IFLA_BROADCAST] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN },
@ -937,6 +937,48 @@ static int rtnl_dellink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
return 0;
}
struct net_device *rtnl_create_link(char *ifname,
const struct rtnl_link_ops *ops, struct nlattr *tb[])
{
int err;
struct net_device *dev;
err = -ENOMEM;
dev = alloc_netdev(ops->priv_size, ifname, ops->setup);
if (!dev)
goto err;
if (strchr(dev->name, '%')) {
err = dev_alloc_name(dev, dev->name);
if (err < 0)
goto err_free;
}
dev->rtnl_link_ops = ops;
if (tb[IFLA_MTU])
dev->mtu = nla_get_u32(tb[IFLA_MTU]);
if (tb[IFLA_ADDRESS])
memcpy(dev->dev_addr, nla_data(tb[IFLA_ADDRESS]),
nla_len(tb[IFLA_ADDRESS]));
if (tb[IFLA_BROADCAST])
memcpy(dev->broadcast, nla_data(tb[IFLA_BROADCAST]),
nla_len(tb[IFLA_BROADCAST]));
if (tb[IFLA_TXQLEN])
dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]);
if (tb[IFLA_OPERSTATE])
set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE]));
if (tb[IFLA_LINKMODE])
dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]);
return dev;
err_free:
free_netdev(dev);
err:
return ERR_PTR(err);
}
static int rtnl_newlink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
{
const struct rtnl_link_ops *ops;
@ -1049,38 +1091,17 @@ replay:
if (!ifname[0])
snprintf(ifname, IFNAMSIZ, "%s%%d", ops->kind);
dev = alloc_netdev(ops->priv_size, ifname, ops->setup);
if (!dev)
return -ENOMEM;
if (strchr(dev->name, '%')) {
err = dev_alloc_name(dev, dev->name);
if (err < 0)
goto err_free;
}
dev->rtnl_link_ops = ops;
dev = rtnl_create_link(ifname, ops, tb);
if (tb[IFLA_MTU])
dev->mtu = nla_get_u32(tb[IFLA_MTU]);
if (tb[IFLA_ADDRESS])
memcpy(dev->dev_addr, nla_data(tb[IFLA_ADDRESS]),
nla_len(tb[IFLA_ADDRESS]));
if (tb[IFLA_BROADCAST])
memcpy(dev->broadcast, nla_data(tb[IFLA_BROADCAST]),
nla_len(tb[IFLA_BROADCAST]));
if (tb[IFLA_TXQLEN])
dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]);
if (tb[IFLA_OPERSTATE])
set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE]));
if (tb[IFLA_LINKMODE])
dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]);
if (ops->newlink)
if (IS_ERR(dev))
err = PTR_ERR(dev);
else if (ops->newlink)
err = ops->newlink(dev, tb, data);
else
err = register_netdevice(dev);
err_free:
if (err < 0)
if (err < 0 && !IS_ERR(dev))
free_netdev(dev);
return err;
}
@ -1329,3 +1350,5 @@ EXPORT_SYMBOL(rtnl_unlock);
EXPORT_SYMBOL(rtnl_unicast);
EXPORT_SYMBOL(rtnl_notify);
EXPORT_SYMBOL(rtnl_set_sk_err);
EXPORT_SYMBOL(rtnl_create_link);
EXPORT_SYMBOL(ifla_policy);