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net: rtnetlink: add possibility to use alternative names as message handle 

Extend the basic rtnetlink commands to use alternative interface names
as a handle instead of ifindex and ifname.

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 11:48:20 +02:00 committed by David S. Miller
parent cc6090e985
commit 76c9ac0ee8
1 changed files with 18 additions and 11 deletions
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29
net/core/rtnetlink.c
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@ -2780,14 +2780,17 @@ errout:
static struct net_device *rtnl_dev_get(struct net *net,
struct nlattr *ifname_attr,
struct nlattr *altifname_attr,
char *ifname)
{
char buffer[IFNAMSIZ];
char buffer[ALTIFNAMSIZ];
if (!ifname) {
ifname = buffer;
if (ifname_attr)
nla_strlcpy(ifname, ifname_attr, IFNAMSIZ);
else if (altifname_attr)
nla_strlcpy(ifname, altifname_attr, ALTIFNAMSIZ);
else
return NULL;
}
@ -2823,8 +2826,8 @@ static int rtnl_setlink(struct sk_buff *skb, struct nlmsghdr *nlh,
ifm = nlmsg_data(nlh);
if (ifm->ifi_index > 0)
dev = __dev_get_by_index(net, ifm->ifi_index);
else if (tb[IFLA_IFNAME])
dev = rtnl_dev_get(net, NULL, ifname);
else if (tb[IFLA_IFNAME] || tb[IFLA_ALT_IFNAME])
dev = rtnl_dev_get(net, NULL, tb[IFLA_ALT_IFNAME], ifname);
else
goto errout;
@ -2921,8 +2924,9 @@ static int rtnl_dellink(struct sk_buff *skb, struct nlmsghdr *nlh,
ifm = nlmsg_data(nlh);
if (ifm->ifi_index > 0)
dev = __dev_get_by_index(tgt_net, ifm->ifi_index);
else if (tb[IFLA_IFNAME])
dev = rtnl_dev_get(net, tb[IFLA_IFNAME], NULL);
else if (tb[IFLA_IFNAME] || tb[IFLA_ALT_IFNAME])
dev = rtnl_dev_get(net, tb[IFLA_IFNAME],
tb[IFLA_ALT_IFNAME], NULL);
else if (tb[IFLA_GROUP])
err = rtnl_group_dellink(tgt_net, nla_get_u32(tb[IFLA_GROUP]));
else
@ -3093,8 +3097,8 @@ replay:
ifm = nlmsg_data(nlh);
if (ifm->ifi_index > 0)
dev = __dev_get_by_index(net, ifm->ifi_index);
else if (tb[IFLA_IFNAME])
dev = rtnl_dev_get(net, NULL, ifname);
else if (tb[IFLA_IFNAME] || tb[IFLA_ALT_IFNAME])
dev = rtnl_dev_get(net, NULL, tb[IFLA_ALT_IFNAME], ifname);
else
dev = NULL;
@ -3358,6 +3362,7 @@ static int rtnl_valid_getlink_req(struct sk_buff *skb,
switch (i) {
case IFLA_IFNAME:
case IFLA_ALT_IFNAME:
case IFLA_EXT_MASK:
case IFLA_TARGET_NETNSID:
break;
@ -3405,8 +3410,9 @@ static int rtnl_getlink(struct sk_buff *skb, struct nlmsghdr *nlh,
ifm = nlmsg_data(nlh);
if (ifm->ifi_index > 0)
dev = __dev_get_by_index(tgt_net, ifm->ifi_index);
else if (tb[IFLA_IFNAME])
dev = rtnl_dev_get(tgt_net, tb[IFLA_IFNAME], NULL);
else if (tb[IFLA_IFNAME] || tb[IFLA_ALT_IFNAME])
dev = rtnl_dev_get(tgt_net, tb[IFLA_IFNAME],
tb[IFLA_ALT_IFNAME], NULL);
else
goto out;
@ -3491,8 +3497,9 @@ static int rtnl_linkprop(int cmd, struct sk_buff *skb, struct nlmsghdr *nlh,
ifm = nlmsg_data(nlh);
if (ifm->ifi_index > 0)
dev = __dev_get_by_index(net, ifm->ifi_index);
else if (tb[IFLA_IFNAME])
dev = rtnl_dev_get(net, tb[IFLA_IFNAME], NULL);
else if (tb[IFLA_IFNAME] || tb[IFLA_ALT_IFNAME])
dev = rtnl_dev_get(net, tb[IFLA_IFNAME],
tb[IFLA_ALT_IFNAME], NULL);
else
return -EINVAL;