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>

diff --git a/include/linux/nl802154.h b/include/linux/nl802154.h
index 275fd94..33d9f51 100644 (file)
--- a/include/linux/nl802154.h
+++ b/include/linux/nl802154.h
@@ -118,6 +118,8 @@ enum {
 
        IEEE802154_LIST_IFACE,
        IEEE802154_LIST_PHY,
+       IEEE802154_ADD_IFACE,
+       IEEE802154_DEL_IFACE,
 
        __IEEE802154_CMD_MAX,
 };

diff --git a/include/net/wpan-phy.h b/include/net/wpan-phy.h
index a65e985..8592623 100644 (file)
--- a/include/net/wpan-phy.h
+++ b/include/net/wpan-phy.h
@@ -41,6 +41,10 @@ struct wpan_phy {
        struct device dev;
        int idx;
 
+       struct net_device *(*add_iface)(struct wpan_phy *phy,
+                       const char *name);
+       void (*del_iface)(struct wpan_phy *phy, struct net_device *dev);
+
        char priv[0] __attribute__((__aligned__(NETDEV_ALIGN)));
 };
 

diff --git a/net/ieee802154/nl-phy.c b/net/ieee802154/nl-phy.c
index b7af722..199a2d9 100644 (file)
--- 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),
 };
 
 /*