net: rtnetlink: add linkprop commands to add and delete alternative ifnames
Add two commands to add and delete list of link properties. Implement
the first property type along - alternative ifnames.
Each net device can have multiple alternative names.
Signed-off-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c
index 1ee6460..e136469 100644
--- a/net/core/rtnetlink.c
+++ b/net/core/rtnetlink.c
@@ -1750,6 +1750,9 @@ static const struct nla_policy ifla_policy[IFLA_MAX+1] = {
[IFLA_CARRIER_DOWN_COUNT] = { .type = NLA_U32 },
[IFLA_MIN_MTU] = { .type = NLA_U32 },
[IFLA_MAX_MTU] = { .type = NLA_U32 },
+ [IFLA_PROP_LIST] = { .type = NLA_NESTED },
+ [IFLA_ALT_IFNAME] = { .type = NLA_STRING,
+ .len = ALTIFNAMSIZ - 1 },
};
static const struct nla_policy ifla_info_policy[IFLA_INFO_MAX+1] = {
@@ -3373,6 +3376,103 @@ static int rtnl_getlink(struct sk_buff *skb, struct nlmsghdr *nlh,
return err;
}
+static int rtnl_alt_ifname(int cmd, struct net_device *dev, struct nlattr *attr,
+ bool *changed, struct netlink_ext_ack *extack)
+{
+ char *alt_ifname;
+ int err;
+
+ err = nla_validate(attr, attr->nla_len, IFLA_MAX, ifla_policy, extack);
+ if (err)
+ return err;
+
+ alt_ifname = nla_data(attr);
+ if (cmd == RTM_NEWLINKPROP) {
+ alt_ifname = kstrdup(alt_ifname, GFP_KERNEL);
+ if (!alt_ifname)
+ return -ENOMEM;
+ err = netdev_name_node_alt_create(dev, alt_ifname);
+ if (err) {
+ kfree(alt_ifname);
+ return err;
+ }
+ } else if (cmd == RTM_DELLINKPROP) {
+ err = netdev_name_node_alt_destroy(dev, alt_ifname);
+ if (err)
+ return err;
+ } else {
+ WARN_ON(1);
+ return 0;
+ }
+
+ *changed = true;
+ return 0;
+}
+
+static int rtnl_linkprop(int cmd, struct sk_buff *skb, struct nlmsghdr *nlh,
+ struct netlink_ext_ack *extack)
+{
+ struct net *net = sock_net(skb->sk);
+ struct nlattr *tb[IFLA_MAX + 1];
+ struct net_device *dev;
+ struct ifinfomsg *ifm;
+ bool changed = false;
+ struct nlattr *attr;
+ int err, rem;
+
+ err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy, extack);
+ if (err)
+ return err;
+
+ err = rtnl_ensure_unique_netns(tb, extack, true);
+ if (err)
+ return err;
+
+ ifm = nlmsg_data(nlh);
+ 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 {
+ return -EINVAL;
+ }
+
+ if (!dev)
+ return -ENODEV;
+
+ if (!tb[IFLA_PROP_LIST])
+ return 0;
+
+ nla_for_each_nested(attr, tb[IFLA_PROP_LIST], rem) {
+ switch (nla_type(attr)) {
+ case IFLA_ALT_IFNAME:
+ err = rtnl_alt_ifname(cmd, dev, attr, &changed, extack);
+ if (err)
+ return err;
+ break;
+ }
+ }
+
+ if (changed)
+ netdev_state_change(dev);
+ return 0;
+}
+
+static int rtnl_newlinkprop(struct sk_buff *skb, struct nlmsghdr *nlh,
+ struct netlink_ext_ack *extack)
+{
+ return rtnl_linkprop(RTM_NEWLINKPROP, skb, nlh, extack);
+}
+
+static int rtnl_dellinkprop(struct sk_buff *skb, struct nlmsghdr *nlh,
+ struct netlink_ext_ack *extack)
+{
+ return rtnl_linkprop(RTM_DELLINKPROP, skb, nlh, extack);
+}
+
static u16 rtnl_calcit(struct sk_buff *skb, struct nlmsghdr *nlh)
{
struct net *net = sock_net(skb->sk);
@@ -5331,6 +5431,9 @@ void __init rtnetlink_init(void)
rtnl_register(PF_UNSPEC, RTM_GETROUTE, NULL, rtnl_dump_all, 0);
rtnl_register(PF_UNSPEC, RTM_GETNETCONF, NULL, rtnl_dump_all, 0);
+ rtnl_register(PF_UNSPEC, RTM_NEWLINKPROP, rtnl_newlinkprop, NULL, 0);
+ rtnl_register(PF_UNSPEC, RTM_DELLINKPROP, rtnl_dellinkprop, NULL, 0);
+
rtnl_register(PF_BRIDGE, RTM_NEWNEIGH, rtnl_fdb_add, NULL, 0);
rtnl_register(PF_BRIDGE, RTM_DELNEIGH, rtnl_fdb_del, NULL, 0);
rtnl_register(PF_BRIDGE, RTM_GETNEIGH, rtnl_fdb_get, rtnl_fdb_dump, 0);
