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