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net: rtnetlink: put alternative names to getlink message 

Extend exiting getlink info message with list of properties. Now the
only ones are alternative names.

Signed-off-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jiri Pirko 2019-09-30 11:48:17 +02:00 committed by David S. Miller
parent 36fbf1e52b
commit 88f4fb0c74
1 changed files with 53 additions and 0 deletions
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53
net/core/rtnetlink.c
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@ -980,6 +980,19 @@ static size_t rtnl_xdp_size(void)
return xdp_size;
}
static size_t rtnl_prop_list_size(const struct net_device *dev)
{
struct netdev_name_node *name_node;
size_t size;
if (list_empty(&dev->name_node->list))
return 0;
size = nla_total_size(0);
list_for_each_entry(name_node, &dev->name_node->list, list)
size += nla_total_size(ALTIFNAMSIZ);
return size;
}
static noinline size_t if_nlmsg_size(const struct net_device *dev,
u32 ext_filter_mask)
{
@ -1027,6 +1040,7 @@ static noinline size_t if_nlmsg_size(const struct net_device *dev,
+ nla_total_size(4) /* IFLA_CARRIER_DOWN_COUNT */
+ nla_total_size(4) /* IFLA_MIN_MTU */
+ nla_total_size(4) /* IFLA_MAX_MTU */
+ rtnl_prop_list_size(dev)
+ 0;
}
@ -1584,6 +1598,42 @@ static int rtnl_fill_link_af(struct sk_buff *skb,
return 0;
}
static int rtnl_fill_alt_ifnames(struct sk_buff *skb,
const struct net_device *dev)
{
struct netdev_name_node *name_node;
int count = 0;
list_for_each_entry(name_node, &dev->name_node->list, list) {
if (nla_put_string(skb, IFLA_ALT_IFNAME, name_node->name))
return -EMSGSIZE;
count++;
}
return count;
}
static int rtnl_fill_prop_list(struct sk_buff *skb,
const struct net_device *dev)
{
struct nlattr *prop_list;
int ret;
prop_list = nla_nest_start(skb, IFLA_PROP_LIST);
if (!prop_list)
return -EMSGSIZE;
ret = rtnl_fill_alt_ifnames(skb, dev);
if (ret <= 0)
goto nest_cancel;
nla_nest_end(skb, prop_list);
return 0;
nest_cancel:
nla_nest_cancel(skb, prop_list);
return ret;
}
static int rtnl_fill_ifinfo(struct sk_buff *skb,
struct net_device *dev, struct net *src_net,
int type, u32 pid, u32 seq, u32 change,
@ -1697,6 +1747,9 @@ static int rtnl_fill_ifinfo(struct sk_buff *skb,
goto nla_put_failure_rcu;
rcu_read_unlock();
if (rtnl_fill_prop_list(skb, dev))
goto nla_put_failure;
nlmsg_end(skb, nlh);
return 0;