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net: rtnetlink: introduce helper to get net_device instance by ifname

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Introduce helper function rtnl_get_dev() that gets net_device structure
instance pointer according to passed ifname or ifname attribute.

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 11:48:19 +02:00 committed by David S. Miller
parent 7af12cba4e
commit cc6090e985
1 changed files with 25 additions and 20 deletions
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45
net/core/rtnetlink.c
View file

@ -2778,6 +2778,23 @@ static int do_setlink(const struct sk_buff *skb,
return err;
}
static struct net_device *rtnl_dev_get(struct net *net,
struct nlattr *ifname_attr,
char *ifname)
{
char buffer[IFNAMSIZ];
if (!ifname) {
ifname = buffer;
if (ifname_attr)
nla_strlcpy(ifname, ifname_attr, IFNAMSIZ);
else
return NULL;
}
return __dev_get_by_name(net, ifname);
}
static int rtnl_setlink(struct sk_buff *skb, struct nlmsghdr *nlh,
struct netlink_ext_ack *extack)
{
@ -2807,7 +2824,7 @@ static int rtnl_setlink(struct sk_buff *skb, struct nlmsghdr *nlh,
if (ifm->ifi_index > 0)
dev = __dev_get_by_index(net, ifm->ifi_index);
else if (tb[IFLA_IFNAME])
dev = __dev_get_by_name(net, ifname);
dev = rtnl_dev_get(net, NULL, ifname);
else
goto errout;
@ -2880,7 +2897,6 @@ static int rtnl_dellink(struct sk_buff *skb, struct nlmsghdr *nlh,
struct net *tgt_net = net;
struct net_device *dev = NULL;
struct ifinfomsg *ifm;
char ifname[IFNAMSIZ];
struct nlattr *tb[IFLA_MAX+1];
int err;
int netnsid = -1;
@ -2894,9 +2910,6 @@ static int rtnl_dellink(struct sk_buff *skb, struct nlmsghdr *nlh,
if (err < 0)
return err;
if (tb[IFLA_IFNAME])
nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
if (tb[IFLA_TARGET_NETNSID]) {
netnsid = nla_get_s32(tb[IFLA_TARGET_NETNSID]);
tgt_net = rtnl_get_net_ns_capable(NETLINK_CB(skb).sk, netnsid);
@ -2909,7 +2922,7 @@ static int rtnl_dellink(struct sk_buff *skb, struct nlmsghdr *nlh,
if (ifm->ifi_index > 0)
dev = __dev_get_by_index(tgt_net, ifm->ifi_index);
else if (tb[IFLA_IFNAME])
dev = __dev_get_by_name(tgt_net, ifname);
dev = rtnl_dev_get(net, tb[IFLA_IFNAME], NULL);
else if (tb[IFLA_GROUP])
err = rtnl_group_dellink(tgt_net, nla_get_u32(tb[IFLA_GROUP]));
else
@ -3081,7 +3094,7 @@ static int __rtnl_newlink(struct sk_buff *skb, struct nlmsghdr *nlh,
if (ifm->ifi_index > 0)
dev = __dev_get_by_index(net, ifm->ifi_index);
else if (tb[IFLA_IFNAME])
dev = __dev_get_by_name(net, ifname);
dev = rtnl_dev_get(net, NULL, ifname);
else
dev = NULL;
@ -3363,7 +3376,6 @@ static int rtnl_getlink(struct sk_buff *skb, struct nlmsghdr *nlh,
struct net *net = sock_net(skb->sk);
struct net *tgt_net = net;
struct ifinfomsg *ifm;
char ifname[IFNAMSIZ];
struct nlattr *tb[IFLA_MAX+1];
struct net_device *dev = NULL;
struct sk_buff *nskb;
@ -3386,9 +3398,6 @@ static int rtnl_getlink(struct sk_buff *skb, struct nlmsghdr *nlh,
return PTR_ERR(tgt_net);
}
if (tb[IFLA_IFNAME])
nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
if (tb[IFLA_EXT_MASK])
ext_filter_mask = nla_get_u32(tb[IFLA_EXT_MASK]);
@ -3397,7 +3406,7 @@ static int rtnl_getlink(struct sk_buff *skb, struct nlmsghdr *nlh,
if (ifm->ifi_index > 0)
dev = __dev_get_by_index(tgt_net, ifm->ifi_index);
else if (tb[IFLA_IFNAME])
dev = __dev_get_by_name(tgt_net, ifname);
dev = rtnl_dev_get(tgt_net, tb[IFLA_IFNAME], NULL);
else
goto out;
@ -3480,16 +3489,12 @@ static int rtnl_linkprop(int cmd, struct sk_buff *skb, struct nlmsghdr *nlh,
return err;
ifm = nlmsg_data(nlh);
if (ifm->ifi_index > 0) {
if (ifm->ifi_index > 0)
dev = __dev_get_by_index(net, ifm->ifi_index);
} else if (tb[IFLA_IFNAME]) {
char ifname[IFNAMSIZ];
nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
dev = __dev_get_by_name(net, ifname);
} else {
else if (tb[IFLA_IFNAME])
dev = rtnl_dev_get(net, tb[IFLA_IFNAME], NULL);
else
return -EINVAL;
}
if (!dev)
return -ENODEV;