ieee802154: add support for creation/removal of logic interfaces

Add support for two more NL802154 commands: ADD_IFACE and DEL_IFACE,
thus allowing creation and removal of logic WPAN interfaces on the top
of wpan-phy.

Signed-off-by: Dmitry Eremin-Solenikov <dbaryshkov@gmail.com>

1 files changed, 156 insertions, 0 deletions

diff --git a/net/ieee802154/nl-phy.c b/net/ieee802154/nl-phy.c
index b7af722eb784..199a2d9d12f9 100644
--- a/net/ieee802154/nl-phy.c
+++ b/net/ieee802154/nl-phy.c
@@ -26,6 +26,9 @@
 #include <net/netlink.h>
 #include <net/genetlink.h>
 #include <net/wpan-phy.h>
+#include <net/af_ieee802154.h>
+#include <net/ieee802154_netdev.h>
+#include <net/rtnetlink.h> /* for rtnl_{un,}lock */
 #include <linux/nl802154.h>
 
 #include "ieee802154.h"
@@ -164,9 +167,162 @@ static int ieee802154_dump_phy(struct sk_buff *skb,
         return skb->len;
 }
 
+static int ieee802154_add_iface(struct sk_buff *skb,
+                struct genl_info *info)
+{
+        struct sk_buff *msg;
+        struct wpan_phy *phy;
+        const char *name;
+        const char *devname;
+        int rc = -ENOBUFS;
+        struct net_device *dev;
+
+        pr_debug("%s\n", __func__);
+
+        if (!info->attrs[IEEE802154_ATTR_PHY_NAME])
+                return -EINVAL;
+
+        name = nla_data(info->attrs[IEEE802154_ATTR_PHY_NAME]);
+        if (name[nla_len(info->attrs[IEEE802154_ATTR_PHY_NAME]) - 1] != '\0')
+                return -EINVAL; /* phy name should be null-terminated */
+
+        if (info->attrs[IEEE802154_ATTR_DEV_NAME]) {
+                devname = nla_data(info->attrs[IEEE802154_ATTR_DEV_NAME]);
+                if (devname[nla_len(info->attrs[IEEE802154_ATTR_DEV_NAME]) - 1]
+                                != '\0')
+                        return -EINVAL; /* phy name should be null-terminated */
+        } else  {
+                devname = "wpan%d";
+        }
+
+        if (strlen(devname) >= IFNAMSIZ)
+                return -ENAMETOOLONG;
+
+        phy = wpan_phy_find(name);
+        if (!phy)
+                return -ENODEV;
+
+        msg = ieee802154_nl_new_reply(info, 0, IEEE802154_ADD_IFACE);
+        if (!msg)
+                goto out_dev;
+
+        if (!phy->add_iface) {
+                rc = -EINVAL;
+                goto nla_put_failure;
+        }
+
+        dev = phy->add_iface(phy, devname);
+        if (IS_ERR(dev)) {
+                rc = PTR_ERR(dev);
+                goto nla_put_failure;
+        }
+
+        NLA_PUT_STRING(msg, IEEE802154_ATTR_PHY_NAME, wpan_phy_name(phy));
+        NLA_PUT_STRING(msg, IEEE802154_ATTR_DEV_NAME, dev->name);
+
+        dev_put(dev);
+
+        wpan_phy_put(phy);
+
+        return ieee802154_nl_reply(msg, info);
+
+nla_put_failure:
+        nlmsg_free(msg);
+out_dev:
+        wpan_phy_put(phy);
+        return rc;
+}
+
+static int ieee802154_del_iface(struct sk_buff *skb,
+                struct genl_info *info)
+{
+        struct sk_buff *msg;
+        struct wpan_phy *phy;
+        const char *name;
+        int rc;
+        struct net_device *dev;
+
+        pr_debug("%s\n", __func__);
+
+        if (!info->attrs[IEEE802154_ATTR_DEV_NAME])
+                return -EINVAL;
+
+        name = nla_data(info->attrs[IEEE802154_ATTR_DEV_NAME]);
+        if (name[nla_len(info->attrs[IEEE802154_ATTR_DEV_NAME]) - 1] != '\0')
+                return -EINVAL; /* name should be null-terminated */
+
+        dev = dev_get_by_name(genl_info_net(info), name);
+        if (!dev)
+                return -ENODEV;
+
+        phy = ieee802154_mlme_ops(dev)->get_phy(dev);
+        BUG_ON(!phy);
+
+        rc = -EINVAL;
+        /* phy name is optional, but should be checked if it's given */
+        if (info->attrs[IEEE802154_ATTR_PHY_NAME]) {
+                struct wpan_phy *phy2;
+
+                const char *pname =
+                        nla_data(info->attrs[IEEE802154_ATTR_PHY_NAME]);
+                if (pname[nla_len(info->attrs[IEEE802154_ATTR_PHY_NAME]) - 1]
+                                != '\0')
+                        /* name should be null-terminated */
+                        goto out_dev;
+
+                phy2 = wpan_phy_find(pname);
+                if (!phy2)
+                        goto out_dev;
+
+                if (phy != phy2) {
+                        wpan_phy_put(phy2);
+                        goto out_dev;
+                }
+        }
+
+        rc = -ENOBUFS;
+
+        msg = ieee802154_nl_new_reply(info, 0, IEEE802154_DEL_IFACE);
+        if (!msg)
+                goto out_dev;
+
+        if (!phy->del_iface) {
+                rc = -EINVAL;
+                goto nla_put_failure;
+        }
+
+        rtnl_lock();
+        phy->del_iface(phy, dev);
+
+        /* We don't have device anymore */
+        dev_put(dev);
+        dev = NULL;
+
+        rtnl_unlock();
+
+
+        NLA_PUT_STRING(msg, IEEE802154_ATTR_PHY_NAME, wpan_phy_name(phy));
+        NLA_PUT_STRING(msg, IEEE802154_ATTR_DEV_NAME, name);
+
+        wpan_phy_put(phy);
+
+        return ieee802154_nl_reply(msg, info);
+
+nla_put_failure:
+        nlmsg_free(msg);
+out_dev:
+        wpan_phy_put(phy);
+        if (dev)
+                dev_put(dev);
+
+        return rc;
+}
+
 static struct genl_ops ieee802154_phy_ops[] = {
         IEEE802154_DUMP(IEEE802154_LIST_PHY, ieee802154_list_phy,
                                                         ieee802154_dump_phy),
+        IEEE802154_OP(IEEE802154_ADD_IFACE, ieee802154_add_iface),
+        IEEE802154_OP(IEEE802154_DEL_IFACE, ieee802154_del_iface),
 };
 
 /*