[NL80211]: add netlink interface to cfg80211
authorJohannes Berg <johannes@sipsolutions.net>
Thu, 20 Sep 2007 17:09:35 +0000 (13:09 -0400)
committerDavid S. Miller <davem@sunset.davemloft.net>
Wed, 10 Oct 2007 23:52:14 +0000 (16:52 -0700)
Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
include/linux/nl80211.h
include/net/cfg80211.h
include/net/iw_handler.h
net/mac80211/ieee80211_cfg.c
net/wireless/Kconfig
net/wireless/Makefile
net/wireless/core.c
net/wireless/core.h
net/wireless/nl80211.c [new file with mode: 0644]
net/wireless/nl80211.h [new file with mode: 0644]

index 9a30ba2ca75eed3dcdb1709010fe20204e81335e..538ee1dd3d0af43959a44d1a7b37a549eb128162 100644 (file)
@@ -6,8 +6,98 @@
  * Copyright 2006, 2007 Johannes Berg <johannes@sipsolutions.net>
  */
 
+/**
+ * enum nl80211_commands - supported nl80211 commands
+ *
+ * @NL80211_CMD_UNSPEC: unspecified command to catch errors
+ *
+ * @NL80211_CMD_GET_WIPHY: request information about a wiphy or dump request
+ *     to get a list of all present wiphys.
+ * @NL80211_CMD_SET_WIPHY: set wiphy name, needs %NL80211_ATTR_WIPHY and
+ *     %NL80211_ATTR_WIPHY_NAME.
+ * @NL80211_CMD_NEW_WIPHY: Newly created wiphy, response to get request
+ *     or rename notification. Has attributes %NL80211_ATTR_WIPHY and
+ *     %NL80211_ATTR_WIPHY_NAME.
+ * @NL80211_CMD_DEL_WIPHY: Wiphy deleted. Has attributes
+ *     %NL80211_ATTR_WIPHY and %NL80211_ATTR_WIPHY_NAME.
+ *
+ * @NL80211_CMD_GET_INTERFACE: Request an interface's configuration;
+ *     either a dump request on a %NL80211_ATTR_WIPHY or a specific get
+ *     on an %NL80211_ATTR_IFINDEX is supported.
+ * @NL80211_CMD_SET_INTERFACE: Set type of a virtual interface, requires
+ *     %NL80211_ATTR_IFINDEX and %NL80211_ATTR_IFTYPE.
+ * @NL80211_CMD_NEW_INTERFACE: Newly created virtual interface or response
+ *     to %NL80211_CMD_GET_INTERFACE. Has %NL80211_ATTR_IFINDEX,
+ *     %NL80211_ATTR_WIPHY and %NL80211_ATTR_IFTYPE attributes. Can also
+ *     be sent from userspace to request creation of a new virtual interface,
+ *     then requires attributes %NL80211_ATTR_WIPHY, %NL80211_ATTR_IFTYPE and
+ *     %NL80211_ATTR_IFNAME.
+ * @NL80211_CMD_DEL_INTERFACE: Virtual interface was deleted, has attributes
+ *     %NL80211_ATTR_IFINDEX and %NL80211_ATTR_WIPHY. Can also be sent from
+ *     userspace to request deletion of a virtual interface, then requires
+ *     attribute %NL80211_ATTR_IFINDEX.
+ *
+ * @NL80211_CMD_MAX: highest used command number
+ * @__NL80211_CMD_AFTER_LAST: internal use
+ */
+enum nl80211_commands {
+/* don't change the order or add anything inbetween, this is ABI! */
+       NL80211_CMD_UNSPEC,
+
+       NL80211_CMD_GET_WIPHY,          /* can dump */
+       NL80211_CMD_SET_WIPHY,
+       NL80211_CMD_NEW_WIPHY,
+       NL80211_CMD_DEL_WIPHY,
+
+       NL80211_CMD_GET_INTERFACE,      /* can dump */
+       NL80211_CMD_SET_INTERFACE,
+       NL80211_CMD_NEW_INTERFACE,
+       NL80211_CMD_DEL_INTERFACE,
+
+       /* add commands here */
+
+       /* used to define NL80211_CMD_MAX below */
+       __NL80211_CMD_AFTER_LAST,
+       NL80211_CMD_MAX = __NL80211_CMD_AFTER_LAST - 1
+};
+
+
+/**
+ * enum nl80211_attrs - nl80211 netlink attributes
+ *
+ * @NL80211_ATTR_UNSPEC: unspecified attribute to catch errors
+ *
+ * @NL80211_ATTR_WIPHY: index of wiphy to operate on, cf.
+ *     /sys/class/ieee80211/<phyname>/index
+ * @NL80211_ATTR_WIPHY_NAME: wiphy name (used for renaming)
+ *
+ * @NL80211_ATTR_IFINDEX: network interface index of the device to operate on
+ * @NL80211_ATTR_IFNAME: network interface name
+ * @NL80211_ATTR_IFTYPE: type of virtual interface, see &enum nl80211_iftype
+ *
+ * @NL80211_ATTR_MAX: highest attribute number currently defined
+ * @__NL80211_ATTR_AFTER_LAST: internal use
+ */
+enum nl80211_attrs {
+/* don't change the order or add anything inbetween, this is ABI! */
+       NL80211_ATTR_UNSPEC,
+
+       NL80211_ATTR_WIPHY,
+       NL80211_ATTR_WIPHY_NAME,
+
+       NL80211_ATTR_IFINDEX,
+       NL80211_ATTR_IFNAME,
+       NL80211_ATTR_IFTYPE,
+
+       /* add attributes here, update the policy in nl80211.c */
+
+       __NL80211_ATTR_AFTER_LAST,
+       NL80211_ATTR_MAX = __NL80211_ATTR_AFTER_LAST - 1
+};
+
 /**
  * enum nl80211_iftype - (virtual) interface types
+ *
  * @NL80211_IFTYPE_UNSPECIFIED: unspecified type, driver decides
  * @NL80211_IFTYPE_ADHOC: independent BSS member
  * @NL80211_IFTYPE_STATION: managed BSS member
  * @NL80211_IFTYPE_AP_VLAN: VLAN interface for access points
  * @NL80211_IFTYPE_WDS: wireless distribution interface
  * @NL80211_IFTYPE_MONITOR: monitor interface receiving all frames
+ * @NL80211_IFTYPE_MAX: highest interface type number currently defined
  * @__NL80211_IFTYPE_AFTER_LAST: internal use
  *
- * These values are used with the NL80211_ATTR_IFTYPE
+ * These values are used with the %NL80211_ATTR_IFTYPE
  * to set the type of an interface.
  *
  */
@@ -31,8 +122,8 @@ enum nl80211_iftype {
        NL80211_IFTYPE_MONITOR,
 
        /* keep last */
-       __NL80211_IFTYPE_AFTER_LAST
+       __NL80211_IFTYPE_AFTER_LAST,
+       NL80211_IFTYPE_MAX = __NL80211_IFTYPE_AFTER_LAST - 1
 };
-#define NL80211_IFTYPE_MAX (__NL80211_IFTYPE_AFTER_LAST - 1)
 
 #endif /* __LINUX_NL80211_H */
index 7edaef6b29d63b4c6a5fd7af2c4c45a0e1ce5098..d30960e1755c64d32bbd651b195265c1aacca0d5 100644 (file)
@@ -3,15 +3,15 @@
 
 #include <linux/netlink.h>
 #include <linux/skbuff.h>
+#include <linux/nl80211.h>
 #include <net/genetlink.h>
 
 /*
  * 802.11 configuration in-kernel interface
  *
- * Copyright 2006 Johannes Berg <johannes@sipsolutions.net>
+ * Copyright 2006, 2007        Johannes Berg <johannes@sipsolutions.net>
  */
 
-
 /* Radiotap header iteration
  *   implemented in net/wireless/radiotap.c
  *   docs in Documentation/networking/radiotap-headers.txt
@@ -68,11 +68,16 @@ struct wiphy;
  * @add_virtual_intf: create a new virtual interface with the given name
  *
  * @del_virtual_intf: remove the virtual interface determined by ifindex.
+ *
+ * @change_virtual_intf: change type of virtual interface
+ *
  */
 struct cfg80211_ops {
        int     (*add_virtual_intf)(struct wiphy *wiphy, char *name,
-                                   unsigned int type);
+                                   enum nl80211_iftype type);
        int     (*del_virtual_intf)(struct wiphy *wiphy, int ifindex);
+       int     (*change_virtual_intf)(struct wiphy *wiphy, int ifindex,
+                                      enum nl80211_iftype type);
 };
 
 #endif /* __NET_CFG80211_H */
index f23d07ca7c59e060c38a8c4a1aa6a9c6c2e38474..369d50e08b99619874ad8d4b6588228871728c53 100644 (file)
@@ -431,7 +431,13 @@ struct iw_public_data {
  * Those may be called only within the kernel.
  */
 
-/* functions that may be called by driver modules */
+/* First : function strictly used inside the kernel */
+
+/* Handle /proc/net/wireless, called in net/code/dev.c */
+extern int dev_get_wireless_info(char * buffer, char **start, off_t offset,
+                                int length);
+
+/* Second : functions that may be called by driver modules */
 
 /* Send a single event to user space */
 extern void wireless_send_event(struct net_device *    dev,
index b1c13bc9c3ca29245e81e6a58cd5f38247026660..d6fc55cc8ad4778d1c55681d5d4f8440eb46fc90 100644 (file)
@@ -14,7 +14,7 @@
 #include "ieee80211_cfg.h"
 
 static int ieee80211_add_iface(struct wiphy *wiphy, char *name,
-                              unsigned int type)
+                              enum nl80211_iftype type)
 {
        struct ieee80211_local *local = wiphy_priv(wiphy);
        int itype;
index a228d56a91b848c6569a5f94ddb342f674a0d34c..6291f13bba0901a56618d0857c7a7f8a335ef55c 100644 (file)
@@ -1,6 +1,19 @@
 config CFG80211
         tristate "Improved wireless configuration API"
 
+config NL80211
+       bool "nl80211 new netlink interface support"
+       depends CFG80211
+       default y
+       ---help---
+         This option turns on the new netlink interface
+         (nl80211) support in cfg80211.
+
+         If =n, drivers using mac80211 will be configured via
+         wireless extension support provided by that subsystem.
+
+         If unsure, say Y.
+
 config WIRELESS_EXT
        bool "Wireless extensions"
        default n
@@ -10,7 +23,9 @@ config WIRELESS_EXT
 
          Wireless extensions will be replaced by cfg80211 and
          will be required only by legacy drivers that implement
-         wireless extension handlers.
+         wireless extension handlers. This option does not
+         affect the wireless-extension backward compatibility
+         code in cfg80211.
 
          Say N (if you can) unless you know you need wireless
          extensions for external modules.
index 092116e390b67f8c093a8fe2484aabffd3bd33f5..65710a42e5a7890365b4478518653685ebe8e769 100644 (file)
@@ -2,3 +2,4 @@ obj-$(CONFIG_WIRELESS_EXT) += wext.o
 obj-$(CONFIG_CFG80211) += cfg80211.o
 
 cfg80211-y += core.o sysfs.o radiotap.o
+cfg80211-$(CONFIG_NL80211) += nl80211.o
index 9771451eae217d9624db3efbac4e08f91ec9ab5c..febc33bc9c09f644e21a37c1eebebf0c07b04e5b 100644 (file)
@@ -16,6 +16,7 @@
 #include <net/genetlink.h>
 #include <net/cfg80211.h>
 #include <net/wireless.h>
+#include "nl80211.h"
 #include "core.h"
 #include "sysfs.h"
 
@@ -36,6 +37,146 @@ static int wiphy_counter;
 /* for debugfs */
 static struct dentry *ieee80211_debugfs_dir;
 
+/* requires cfg80211_drv_mutex to be held! */
+static struct cfg80211_registered_device *cfg80211_drv_by_wiphy(int wiphy)
+{
+       struct cfg80211_registered_device *result = NULL, *drv;
+
+       list_for_each_entry(drv, &cfg80211_drv_list, list) {
+               if (drv->idx == wiphy) {
+                       result = drv;
+                       break;
+               }
+       }
+
+       return result;
+}
+
+/* requires cfg80211_drv_mutex to be held! */
+static struct cfg80211_registered_device *
+__cfg80211_drv_from_info(struct genl_info *info)
+{
+       int ifindex;
+       struct cfg80211_registered_device *bywiphy = NULL, *byifidx = NULL;
+       struct net_device *dev;
+       int err = -EINVAL;
+
+       if (info->attrs[NL80211_ATTR_WIPHY]) {
+               bywiphy = cfg80211_drv_by_wiphy(
+                               nla_get_u32(info->attrs[NL80211_ATTR_WIPHY]));
+               err = -ENODEV;
+       }
+
+       if (info->attrs[NL80211_ATTR_IFINDEX]) {
+               ifindex = nla_get_u32(info->attrs[NL80211_ATTR_IFINDEX]);
+               dev = dev_get_by_index(&init_net, ifindex);
+               if (dev) {
+                       if (dev->ieee80211_ptr)
+                               byifidx =
+                                       wiphy_to_dev(dev->ieee80211_ptr->wiphy);
+                       dev_put(dev);
+               }
+               err = -ENODEV;
+       }
+
+       if (bywiphy && byifidx) {
+               if (bywiphy != byifidx)
+                       return ERR_PTR(-EINVAL);
+               else
+                       return bywiphy; /* == byifidx */
+       }
+       if (bywiphy)
+               return bywiphy;
+
+       if (byifidx)
+               return byifidx;
+
+       return ERR_PTR(err);
+}
+
+struct cfg80211_registered_device *
+cfg80211_get_dev_from_info(struct genl_info *info)
+{
+       struct cfg80211_registered_device *drv;
+
+       mutex_lock(&cfg80211_drv_mutex);
+       drv = __cfg80211_drv_from_info(info);
+
+       /* if it is not an error we grab the lock on
+        * it to assure it won't be going away while
+        * we operate on it */
+       if (!IS_ERR(drv))
+               mutex_lock(&drv->mtx);
+
+       mutex_unlock(&cfg80211_drv_mutex);
+
+       return drv;
+}
+
+struct cfg80211_registered_device *
+cfg80211_get_dev_from_ifindex(int ifindex)
+{
+       struct cfg80211_registered_device *drv = ERR_PTR(-ENODEV);
+       struct net_device *dev;
+
+       mutex_lock(&cfg80211_drv_mutex);
+       dev = dev_get_by_index(&init_net, ifindex);
+       if (!dev)
+               goto out;
+       if (dev->ieee80211_ptr) {
+               drv = wiphy_to_dev(dev->ieee80211_ptr->wiphy);
+               mutex_lock(&drv->mtx);
+       } else
+               drv = ERR_PTR(-ENODEV);
+       dev_put(dev);
+ out:
+       mutex_unlock(&cfg80211_drv_mutex);
+       return drv;
+}
+
+void cfg80211_put_dev(struct cfg80211_registered_device *drv)
+{
+       BUG_ON(IS_ERR(drv));
+       mutex_unlock(&drv->mtx);
+}
+
+int cfg80211_dev_rename(struct cfg80211_registered_device *rdev,
+                       char *newname)
+{
+       int idx, taken = -1, result, digits;
+
+       /* prohibit calling the thing phy%d when %d is not its number */
+       sscanf(newname, PHY_NAME "%d%n", &idx, &taken);
+       if (taken == strlen(newname) && idx != rdev->idx) {
+               /* count number of places needed to print idx */
+               digits = 1;
+               while (idx /= 10)
+                       digits++;
+               /*
+                * deny the name if it is phy<idx> where <idx> is printed
+                * without leading zeroes. taken == strlen(newname) here
+                */
+               if (taken == strlen(PHY_NAME) + digits)
+                       return -EINVAL;
+       }
+
+       /* this will check for collisions */
+       result = device_rename(&rdev->wiphy.dev, newname);
+       if (result)
+               return result;
+
+       if (!debugfs_rename(rdev->wiphy.debugfsdir->d_parent,
+                           rdev->wiphy.debugfsdir,
+                           rdev->wiphy.debugfsdir->d_parent,
+                           newname))
+               printk(KERN_ERR "cfg80211: failed to rename debugfs dir to %s!\n",
+                      newname);
+
+       nl80211_notify_dev_rename(rdev);
+
+       return 0;
+}
+
 /* exported functions */
 
 struct wiphy *wiphy_new(struct cfg80211_ops *ops, int sizeof_priv)
@@ -204,10 +345,16 @@ static int cfg80211_init(void)
        if (err)
                goto out_fail_notifier;
 
+       err = nl80211_init();
+       if (err)
+               goto out_fail_nl80211;
+
        ieee80211_debugfs_dir = debugfs_create_dir("ieee80211", NULL);
 
        return 0;
 
+out_fail_nl80211:
+       unregister_netdevice_notifier(&cfg80211_netdev_notifier);
 out_fail_notifier:
        wiphy_sysfs_exit();
 out_fail_sysfs:
@@ -218,6 +365,7 @@ subsys_initcall(cfg80211_init);
 static void cfg80211_exit(void)
 {
        debugfs_remove(ieee80211_debugfs_dir);
+       nl80211_exit();
        unregister_netdevice_notifier(&cfg80211_netdev_notifier);
        wiphy_sysfs_exit();
 }
index 158db1edb92a98cc41d09d72864eb1a473f08bf8..eb0f846b40dff4ba9ae6a6b741c5758023b3366b 100644 (file)
@@ -43,7 +43,39 @@ struct cfg80211_registered_device *wiphy_to_dev(struct wiphy *wiphy)
 extern struct mutex cfg80211_drv_mutex;
 extern struct list_head cfg80211_drv_list;
 
+/*
+ * This function returns a pointer to the driver
+ * that the genl_info item that is passed refers to.
+ * If successful, it returns non-NULL and also locks
+ * the driver's mutex!
+ *
+ * This means that you need to call cfg80211_put_dev()
+ * before being allowed to acquire &cfg80211_drv_mutex!
+ *
+ * This is necessary because we need to lock the global
+ * mutex to get an item off the list safely, and then
+ * we lock the drv mutex so it doesn't go away under us.
+ *
+ * We don't want to keep cfg80211_drv_mutex locked
+ * for all the time in order to allow requests on
+ * other interfaces to go through at the same time.
+ *
+ * The result of this can be a PTR_ERR and hence must
+ * be checked with IS_ERR() for errors.
+ */
+extern struct cfg80211_registered_device *
+cfg80211_get_dev_from_info(struct genl_info *info);
+
+/* identical to cfg80211_get_dev_from_info but only operate on ifindex */
+extern struct cfg80211_registered_device *
+cfg80211_get_dev_from_ifindex(int ifindex);
+
+extern void cfg80211_put_dev(struct cfg80211_registered_device *drv);
+
 /* free object */
 extern void cfg80211_dev_free(struct cfg80211_registered_device *drv);
 
+extern int cfg80211_dev_rename(struct cfg80211_registered_device *drv,
+                              char *newname);
+
 #endif /* __NET_WIRELESS_CORE_H */
diff --git a/net/wireless/nl80211.c b/net/wireless/nl80211.c
new file mode 100644 (file)
index 0000000..48b0d45
--- /dev/null
@@ -0,0 +1,431 @@
+/*
+ * This is the new netlink-based wireless configuration interface.
+ *
+ * Copyright 2006, 2007        Johannes Berg <johannes@sipsolutions.net>
+ */
+
+#include <linux/if.h>
+#include <linux/module.h>
+#include <linux/err.h>
+#include <linux/mutex.h>
+#include <linux/list.h>
+#include <linux/if_ether.h>
+#include <linux/ieee80211.h>
+#include <linux/nl80211.h>
+#include <linux/rtnetlink.h>
+#include <linux/netlink.h>
+#include <net/genetlink.h>
+#include <net/cfg80211.h>
+#include "core.h"
+#include "nl80211.h"
+
+/* the netlink family */
+static struct genl_family nl80211_fam = {
+       .id = GENL_ID_GENERATE, /* don't bother with a hardcoded ID */
+       .name = "nl80211",      /* have users key off the name instead */
+       .hdrsize = 0,           /* no private header */
+       .version = 1,           /* no particular meaning now */
+       .maxattr = NL80211_ATTR_MAX,
+};
+
+/* internal helper: get drv and dev */
+static int get_drv_dev_by_info_ifindex(struct genl_info *info,
+                                      struct cfg80211_registered_device **drv,
+                                      struct net_device **dev)
+{
+       int ifindex;
+
+       if (!info->attrs[NL80211_ATTR_IFINDEX])
+               return -EINVAL;
+
+       ifindex = nla_get_u32(info->attrs[NL80211_ATTR_IFINDEX]);
+       *dev = dev_get_by_index(&init_net, ifindex);
+       if (!*dev)
+               return -ENODEV;
+
+       *drv = cfg80211_get_dev_from_ifindex(ifindex);
+       if (IS_ERR(*drv)) {
+               dev_put(*dev);
+               return PTR_ERR(*drv);
+       }
+
+       return 0;
+}
+
+/* policy for the attributes */
+static struct nla_policy nl80211_policy[NL80211_ATTR_MAX+1] __read_mostly = {
+       [NL80211_ATTR_WIPHY] = { .type = NLA_U32 },
+       [NL80211_ATTR_WIPHY_NAME] = { .type = NLA_NUL_STRING,
+                                     .len = BUS_ID_SIZE-1 },
+
+       [NL80211_ATTR_IFTYPE] = { .type = NLA_U32 },
+       [NL80211_ATTR_IFINDEX] = { .type = NLA_U32 },
+       [NL80211_ATTR_IFNAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ-1 },
+};
+
+/* message building helper */
+static inline void *nl80211hdr_put(struct sk_buff *skb, u32 pid, u32 seq,
+                                  int flags, u8 cmd)
+{
+       /* since there is no private header just add the generic one */
+       return genlmsg_put(skb, pid, seq, &nl80211_fam, flags, cmd);
+}
+
+/* netlink command implementations */
+
+static int nl80211_send_wiphy(struct sk_buff *msg, u32 pid, u32 seq, int flags,
+                             struct cfg80211_registered_device *dev)
+{
+       void *hdr;
+
+       hdr = nl80211hdr_put(msg, pid, seq, flags, NL80211_CMD_NEW_WIPHY);
+       if (!hdr)
+               return -1;
+
+       NLA_PUT_U32(msg, NL80211_ATTR_WIPHY, dev->idx);
+       NLA_PUT_STRING(msg, NL80211_ATTR_WIPHY_NAME, wiphy_name(&dev->wiphy));
+       return genlmsg_end(msg, hdr);
+
+ nla_put_failure:
+       return genlmsg_cancel(msg, hdr);
+}
+
+static int nl80211_dump_wiphy(struct sk_buff *skb, struct netlink_callback *cb)
+{
+       int idx = 0;
+       int start = cb->args[0];
+       struct cfg80211_registered_device *dev;
+
+       mutex_lock(&cfg80211_drv_mutex);
+       list_for_each_entry(dev, &cfg80211_drv_list, list) {
+               if (++idx < start)
+                       continue;
+               if (nl80211_send_wiphy(skb, NETLINK_CB(cb->skb).pid,
+                                      cb->nlh->nlmsg_seq, NLM_F_MULTI,
+                                      dev) < 0)
+                       break;
+       }
+       mutex_unlock(&cfg80211_drv_mutex);
+
+       cb->args[0] = idx;
+
+       return skb->len;
+}
+
+static int nl80211_get_wiphy(struct sk_buff *skb, struct genl_info *info)
+{
+       struct sk_buff *msg;
+       struct cfg80211_registered_device *dev;
+
+       dev = cfg80211_get_dev_from_info(info);
+       if (IS_ERR(dev))
+               return PTR_ERR(dev);
+
+       msg = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
+       if (!msg)
+               goto out_err;
+
+       if (nl80211_send_wiphy(msg, info->snd_pid, info->snd_seq, 0, dev) < 0)
+               goto out_free;
+
+       cfg80211_put_dev(dev);
+
+       return genlmsg_unicast(msg, info->snd_pid);
+
+ out_free:
+       nlmsg_free(msg);
+ out_err:
+       cfg80211_put_dev(dev);
+       return -ENOBUFS;
+}
+
+static int nl80211_set_wiphy(struct sk_buff *skb, struct genl_info *info)
+{
+       struct cfg80211_registered_device *rdev;
+       int result;
+
+       if (!info->attrs[NL80211_ATTR_WIPHY_NAME])
+               return -EINVAL;
+
+       rdev = cfg80211_get_dev_from_info(info);
+       if (IS_ERR(rdev))
+               return PTR_ERR(rdev);
+
+       result = cfg80211_dev_rename(rdev, nla_data(info->attrs[NL80211_ATTR_WIPHY_NAME]));
+
+       cfg80211_put_dev(rdev);
+       return result;
+}
+
+
+static int nl80211_send_iface(struct sk_buff *msg, u32 pid, u32 seq, int flags,
+                             struct net_device *dev)
+{
+       void *hdr;
+
+       hdr = nl80211hdr_put(msg, pid, seq, flags, NL80211_CMD_NEW_INTERFACE);
+       if (!hdr)
+               return -1;
+
+       NLA_PUT_U32(msg, NL80211_ATTR_IFINDEX, dev->ifindex);
+       NLA_PUT_STRING(msg, NL80211_ATTR_IFNAME, dev->name);
+       /* TODO: interface type */
+       return genlmsg_end(msg, hdr);
+
+ nla_put_failure:
+       return genlmsg_cancel(msg, hdr);
+}
+
+static int nl80211_dump_interface(struct sk_buff *skb, struct netlink_callback *cb)
+{
+       int wp_idx = 0;
+       int if_idx = 0;
+       int wp_start = cb->args[0];
+       int if_start = cb->args[1];
+       struct cfg80211_registered_device *dev;
+       struct wireless_dev *wdev;
+
+       mutex_lock(&cfg80211_drv_mutex);
+       list_for_each_entry(dev, &cfg80211_drv_list, list) {
+               if (++wp_idx < wp_start)
+                       continue;
+               if_idx = 0;
+
+               mutex_lock(&dev->devlist_mtx);
+               list_for_each_entry(wdev, &dev->netdev_list, list) {
+                       if (++if_idx < if_start)
+                               continue;
+                       if (nl80211_send_iface(skb, NETLINK_CB(cb->skb).pid,
+                                              cb->nlh->nlmsg_seq, NLM_F_MULTI,
+                                              wdev->netdev) < 0)
+                               break;
+               }
+               mutex_unlock(&dev->devlist_mtx);
+       }
+       mutex_unlock(&cfg80211_drv_mutex);
+
+       cb->args[0] = wp_idx;
+       cb->args[1] = if_idx;
+
+       return skb->len;
+}
+
+static int nl80211_get_interface(struct sk_buff *skb, struct genl_info *info)
+{
+       struct sk_buff *msg;
+       struct cfg80211_registered_device *dev;
+       struct net_device *netdev;
+       int err;
+
+       err = get_drv_dev_by_info_ifindex(info, &dev, &netdev);
+       if (err)
+               return err;
+
+       msg = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
+       if (!msg)
+               goto out_err;
+
+       if (nl80211_send_iface(msg, info->snd_pid, info->snd_seq, 0, netdev) < 0)
+               goto out_free;
+
+       dev_put(netdev);
+       cfg80211_put_dev(dev);
+
+       return genlmsg_unicast(msg, info->snd_pid);
+
+ out_free:
+       nlmsg_free(msg);
+ out_err:
+       dev_put(netdev);
+       cfg80211_put_dev(dev);
+       return -ENOBUFS;
+}
+
+static int nl80211_set_interface(struct sk_buff *skb, struct genl_info *info)
+{
+       struct cfg80211_registered_device *drv;
+       int err, ifindex;
+       enum nl80211_iftype type;
+       struct net_device *dev;
+
+       if (info->attrs[NL80211_ATTR_IFTYPE]) {
+               type = nla_get_u32(info->attrs[NL80211_ATTR_IFTYPE]);
+               if (type > NL80211_IFTYPE_MAX)
+                       return -EINVAL;
+       } else
+               return -EINVAL;
+
+       err = get_drv_dev_by_info_ifindex(info, &drv, &dev);
+       if (err)
+               return err;
+       ifindex = dev->ifindex;
+       dev_put(dev);
+
+       if (!drv->ops->change_virtual_intf) {
+               err = -EOPNOTSUPP;
+               goto unlock;
+       }
+
+       rtnl_lock();
+       err = drv->ops->change_virtual_intf(&drv->wiphy, ifindex, type);
+       rtnl_unlock();
+
+ unlock:
+       cfg80211_put_dev(drv);
+       return err;
+}
+
+static int nl80211_new_interface(struct sk_buff *skb, struct genl_info *info)
+{
+       struct cfg80211_registered_device *drv;
+       int err;
+       enum nl80211_iftype type = NL80211_IFTYPE_UNSPECIFIED;
+
+       if (!info->attrs[NL80211_ATTR_IFNAME])
+               return -EINVAL;
+
+       if (info->attrs[NL80211_ATTR_IFTYPE]) {
+               type = nla_get_u32(info->attrs[NL80211_ATTR_IFTYPE]);
+               if (type > NL80211_IFTYPE_MAX)
+                       return -EINVAL;
+       }
+
+       drv = cfg80211_get_dev_from_info(info);
+       if (IS_ERR(drv))
+               return PTR_ERR(drv);
+
+       if (!drv->ops->add_virtual_intf) {
+               err = -EOPNOTSUPP;
+               goto unlock;
+       }
+
+       rtnl_lock();
+       err = drv->ops->add_virtual_intf(&drv->wiphy,
+               nla_data(info->attrs[NL80211_ATTR_IFNAME]), type);
+       rtnl_unlock();
+
+ unlock:
+       cfg80211_put_dev(drv);
+       return err;
+}
+
+static int nl80211_del_interface(struct sk_buff *skb, struct genl_info *info)
+{
+       struct cfg80211_registered_device *drv;
+       int ifindex, err;
+       struct net_device *dev;
+
+       err = get_drv_dev_by_info_ifindex(info, &drv, &dev);
+       if (err)
+               return err;
+       ifindex = dev->ifindex;
+       dev_put(dev);
+
+       if (!drv->ops->del_virtual_intf) {
+               err = -EOPNOTSUPP;
+               goto out;
+       }
+
+       rtnl_lock();
+       err = drv->ops->del_virtual_intf(&drv->wiphy, ifindex);
+       rtnl_unlock();
+
+ out:
+       cfg80211_put_dev(drv);
+       return err;
+}
+
+static struct genl_ops nl80211_ops[] = {
+       {
+               .cmd = NL80211_CMD_GET_WIPHY,
+               .doit = nl80211_get_wiphy,
+               .dumpit = nl80211_dump_wiphy,
+               .policy = nl80211_policy,
+               /* can be retrieved by unprivileged users */
+       },
+       {
+               .cmd = NL80211_CMD_SET_WIPHY,
+               .doit = nl80211_set_wiphy,
+               .policy = nl80211_policy,
+               .flags = GENL_ADMIN_PERM,
+       },
+       {
+               .cmd = NL80211_CMD_GET_INTERFACE,
+               .doit = nl80211_get_interface,
+               .dumpit = nl80211_dump_interface,
+               .policy = nl80211_policy,
+               /* can be retrieved by unprivileged users */
+       },
+       {
+               .cmd = NL80211_CMD_SET_INTERFACE,
+               .doit = nl80211_set_interface,
+               .policy = nl80211_policy,
+               .flags = GENL_ADMIN_PERM,
+       },
+       {
+               .cmd = NL80211_CMD_NEW_INTERFACE,
+               .doit = nl80211_new_interface,
+               .policy = nl80211_policy,
+               .flags = GENL_ADMIN_PERM,
+       },
+       {
+               .cmd = NL80211_CMD_DEL_INTERFACE,
+               .doit = nl80211_del_interface,
+               .policy = nl80211_policy,
+               .flags = GENL_ADMIN_PERM,
+       },
+};
+
+/* multicast groups */
+static struct genl_multicast_group nl80211_config_mcgrp = {
+       .name = "config",
+};
+
+/* notification functions */
+
+void nl80211_notify_dev_rename(struct cfg80211_registered_device *rdev)
+{
+       struct sk_buff *msg;
+
+       msg = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
+       if (!msg)
+               return;
+
+       if (nl80211_send_wiphy(msg, 0, 0, 0, rdev) < 0) {
+               nlmsg_free(msg);
+               return;
+       }
+
+       genlmsg_multicast(msg, 0, nl80211_config_mcgrp.id, GFP_KERNEL);
+}
+
+/* initialisation/exit functions */
+
+int nl80211_init(void)
+{
+       int err, i;
+
+       err = genl_register_family(&nl80211_fam);
+       if (err)
+               return err;
+
+       for (i = 0; i < ARRAY_SIZE(nl80211_ops); i++) {
+               err = genl_register_ops(&nl80211_fam, &nl80211_ops[i]);
+               if (err)
+                       goto err_out;
+       }
+
+       err = genl_register_mc_group(&nl80211_fam, &nl80211_config_mcgrp);
+       if (err)
+               goto err_out;
+
+       return 0;
+ err_out:
+       genl_unregister_family(&nl80211_fam);
+       return err;
+}
+
+void nl80211_exit(void)
+{
+       genl_unregister_family(&nl80211_fam);
+}
diff --git a/net/wireless/nl80211.h b/net/wireless/nl80211.h
new file mode 100644 (file)
index 0000000..f3ea5c0
--- /dev/null
@@ -0,0 +1,24 @@
+#ifndef __NET_WIRELESS_NL80211_H
+#define __NET_WIRELESS_NL80211_H
+
+#include "core.h"
+
+#ifdef CONFIG_NL80211
+extern int nl80211_init(void);
+extern void nl80211_exit(void);
+extern void nl80211_notify_dev_rename(struct cfg80211_registered_device *rdev);
+#else
+static inline int nl80211_init(void)
+{
+       return 0;
+}
+static inline void nl80211_exit(void)
+{
+}
+static inline void nl80211_notify_dev_rename(
+       struct cfg80211_registered_device *rdev)
+{
+}
+#endif /* CONFIG_NL80211 */
+
+#endif /* __NET_WIRELESS_NL80211_H */