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@@ -0,0 +1,431 @@
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+/*
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+ * This is the new netlink-based wireless configuration interface.
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+ *
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+ * Copyright 2006, 2007 Johannes Berg <johannes@sipsolutions.net>
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+ */
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+
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+#include <linux/if.h>
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+#include <linux/module.h>
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+#include <linux/err.h>
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+#include <linux/mutex.h>
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+#include <linux/list.h>
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+#include <linux/if_ether.h>
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+#include <linux/ieee80211.h>
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+#include <linux/nl80211.h>
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+#include <linux/rtnetlink.h>
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+#include <linux/netlink.h>
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+#include <net/genetlink.h>
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+#include <net/cfg80211.h>
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+#include "core.h"
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+#include "nl80211.h"
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+
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+/* the netlink family */
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+static struct genl_family nl80211_fam = {
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+ .id = GENL_ID_GENERATE, /* don't bother with a hardcoded ID */
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+ .name = "nl80211", /* have users key off the name instead */
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+ .hdrsize = 0, /* no private header */
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+ .version = 1, /* no particular meaning now */
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+ .maxattr = NL80211_ATTR_MAX,
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+};
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+
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+/* internal helper: get drv and dev */
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+static int get_drv_dev_by_info_ifindex(struct genl_info *info,
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+ struct cfg80211_registered_device **drv,
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+ struct net_device **dev)
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+{
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+ int ifindex;
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+
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+ if (!info->attrs[NL80211_ATTR_IFINDEX])
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+ return -EINVAL;
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+
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+ ifindex = nla_get_u32(info->attrs[NL80211_ATTR_IFINDEX]);
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+ *dev = dev_get_by_index(&init_net, ifindex);
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+ if (!*dev)
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+ return -ENODEV;
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+
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+ *drv = cfg80211_get_dev_from_ifindex(ifindex);
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+ if (IS_ERR(*drv)) {
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+ dev_put(*dev);
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+ return PTR_ERR(*drv);
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+ }
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+
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+ return 0;
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+}
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+
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+/* policy for the attributes */
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+static struct nla_policy nl80211_policy[NL80211_ATTR_MAX+1] __read_mostly = {
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+ [NL80211_ATTR_WIPHY] = { .type = NLA_U32 },
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+ [NL80211_ATTR_WIPHY_NAME] = { .type = NLA_NUL_STRING,
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+ .len = BUS_ID_SIZE-1 },
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+
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+ [NL80211_ATTR_IFTYPE] = { .type = NLA_U32 },
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+ [NL80211_ATTR_IFINDEX] = { .type = NLA_U32 },
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+ [NL80211_ATTR_IFNAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ-1 },
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+};
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+
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+/* message building helper */
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+static inline void *nl80211hdr_put(struct sk_buff *skb, u32 pid, u32 seq,
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+ int flags, u8 cmd)
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+{
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+ /* since there is no private header just add the generic one */
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+ return genlmsg_put(skb, pid, seq, &nl80211_fam, flags, cmd);
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+}
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+
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+/* netlink command implementations */
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+
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+static int nl80211_send_wiphy(struct sk_buff *msg, u32 pid, u32 seq, int flags,
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+ struct cfg80211_registered_device *dev)
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+{
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+ void *hdr;
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+
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+ hdr = nl80211hdr_put(msg, pid, seq, flags, NL80211_CMD_NEW_WIPHY);
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+ if (!hdr)
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+ return -1;
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+
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+ NLA_PUT_U32(msg, NL80211_ATTR_WIPHY, dev->idx);
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+ NLA_PUT_STRING(msg, NL80211_ATTR_WIPHY_NAME, wiphy_name(&dev->wiphy));
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+ return genlmsg_end(msg, hdr);
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+
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+ nla_put_failure:
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+ return genlmsg_cancel(msg, hdr);
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+}
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+
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+static int nl80211_dump_wiphy(struct sk_buff *skb, struct netlink_callback *cb)
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+{
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+ int idx = 0;
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+ int start = cb->args[0];
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+ struct cfg80211_registered_device *dev;
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+
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+ mutex_lock(&cfg80211_drv_mutex);
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+ list_for_each_entry(dev, &cfg80211_drv_list, list) {
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+ if (++idx < start)
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+ continue;
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+ if (nl80211_send_wiphy(skb, NETLINK_CB(cb->skb).pid,
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+ cb->nlh->nlmsg_seq, NLM_F_MULTI,
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+ dev) < 0)
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+ break;
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+ }
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+ mutex_unlock(&cfg80211_drv_mutex);
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+
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+ cb->args[0] = idx;
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+
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+ return skb->len;
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+}
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+
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+static int nl80211_get_wiphy(struct sk_buff *skb, struct genl_info *info)
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+{
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+ struct sk_buff *msg;
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+ struct cfg80211_registered_device *dev;
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+
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+ dev = cfg80211_get_dev_from_info(info);
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+ if (IS_ERR(dev))
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+ return PTR_ERR(dev);
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+
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+ msg = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
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+ if (!msg)
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+ goto out_err;
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+
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+ if (nl80211_send_wiphy(msg, info->snd_pid, info->snd_seq, 0, dev) < 0)
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+ goto out_free;
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+
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+ cfg80211_put_dev(dev);
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+
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+ return genlmsg_unicast(msg, info->snd_pid);
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+
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+ out_free:
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+ nlmsg_free(msg);
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+ out_err:
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+ cfg80211_put_dev(dev);
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+ return -ENOBUFS;
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+}
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+
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+static int nl80211_set_wiphy(struct sk_buff *skb, struct genl_info *info)
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+{
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+ struct cfg80211_registered_device *rdev;
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+ int result;
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+
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+ if (!info->attrs[NL80211_ATTR_WIPHY_NAME])
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+ return -EINVAL;
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+
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+ rdev = cfg80211_get_dev_from_info(info);
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+ if (IS_ERR(rdev))
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+ return PTR_ERR(rdev);
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+
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+ result = cfg80211_dev_rename(rdev, nla_data(info->attrs[NL80211_ATTR_WIPHY_NAME]));
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+
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+ cfg80211_put_dev(rdev);
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+ return result;
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+}
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+
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+
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+static int nl80211_send_iface(struct sk_buff *msg, u32 pid, u32 seq, int flags,
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+ struct net_device *dev)
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+{
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+ void *hdr;
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+
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+ hdr = nl80211hdr_put(msg, pid, seq, flags, NL80211_CMD_NEW_INTERFACE);
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+ if (!hdr)
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+ return -1;
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+
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+ NLA_PUT_U32(msg, NL80211_ATTR_IFINDEX, dev->ifindex);
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+ NLA_PUT_STRING(msg, NL80211_ATTR_IFNAME, dev->name);
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+ /* TODO: interface type */
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+ return genlmsg_end(msg, hdr);
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+
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+ nla_put_failure:
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+ return genlmsg_cancel(msg, hdr);
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+}
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+
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+static int nl80211_dump_interface(struct sk_buff *skb, struct netlink_callback *cb)
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+{
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+ int wp_idx = 0;
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+ int if_idx = 0;
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+ int wp_start = cb->args[0];
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+ int if_start = cb->args[1];
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+ struct cfg80211_registered_device *dev;
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+ struct wireless_dev *wdev;
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+
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+ mutex_lock(&cfg80211_drv_mutex);
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+ list_for_each_entry(dev, &cfg80211_drv_list, list) {
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+ if (++wp_idx < wp_start)
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+ continue;
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+ if_idx = 0;
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+
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+ mutex_lock(&dev->devlist_mtx);
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+ list_for_each_entry(wdev, &dev->netdev_list, list) {
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+ if (++if_idx < if_start)
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+ continue;
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+ if (nl80211_send_iface(skb, NETLINK_CB(cb->skb).pid,
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+ cb->nlh->nlmsg_seq, NLM_F_MULTI,
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+ wdev->netdev) < 0)
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+ break;
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+ }
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+ mutex_unlock(&dev->devlist_mtx);
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+ }
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+ mutex_unlock(&cfg80211_drv_mutex);
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+
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+ cb->args[0] = wp_idx;
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+ cb->args[1] = if_idx;
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+
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+ return skb->len;
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+}
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+
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+static int nl80211_get_interface(struct sk_buff *skb, struct genl_info *info)
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+{
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+ struct sk_buff *msg;
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+ struct cfg80211_registered_device *dev;
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+ struct net_device *netdev;
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+ int err;
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+
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+ err = get_drv_dev_by_info_ifindex(info, &dev, &netdev);
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+ if (err)
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+ return err;
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+
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+ msg = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
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+ if (!msg)
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+ goto out_err;
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+
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+ if (nl80211_send_iface(msg, info->snd_pid, info->snd_seq, 0, netdev) < 0)
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+ goto out_free;
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+
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+ dev_put(netdev);
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+ cfg80211_put_dev(dev);
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+
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+ return genlmsg_unicast(msg, info->snd_pid);
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+
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+ out_free:
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+ nlmsg_free(msg);
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+ out_err:
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+ dev_put(netdev);
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+ cfg80211_put_dev(dev);
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+ return -ENOBUFS;
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+}
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+
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+static int nl80211_set_interface(struct sk_buff *skb, struct genl_info *info)
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+{
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+ struct cfg80211_registered_device *drv;
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+ int err, ifindex;
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+ enum nl80211_iftype type;
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+ struct net_device *dev;
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+
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+ if (info->attrs[NL80211_ATTR_IFTYPE]) {
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+ type = nla_get_u32(info->attrs[NL80211_ATTR_IFTYPE]);
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+ if (type > NL80211_IFTYPE_MAX)
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+ return -EINVAL;
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+ } else
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+ return -EINVAL;
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+
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+ err = get_drv_dev_by_info_ifindex(info, &drv, &dev);
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+ if (err)
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+ return err;
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+ ifindex = dev->ifindex;
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+ dev_put(dev);
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+
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+ if (!drv->ops->change_virtual_intf) {
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+ err = -EOPNOTSUPP;
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+ goto unlock;
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+ }
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+
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+ rtnl_lock();
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+ err = drv->ops->change_virtual_intf(&drv->wiphy, ifindex, type);
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+ rtnl_unlock();
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+
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+ unlock:
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+ cfg80211_put_dev(drv);
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+ return err;
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+}
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+
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+static int nl80211_new_interface(struct sk_buff *skb, struct genl_info *info)
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+{
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+ struct cfg80211_registered_device *drv;
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+ int err;
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+ enum nl80211_iftype type = NL80211_IFTYPE_UNSPECIFIED;
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+
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+ if (!info->attrs[NL80211_ATTR_IFNAME])
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+ return -EINVAL;
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+
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+ if (info->attrs[NL80211_ATTR_IFTYPE]) {
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+ type = nla_get_u32(info->attrs[NL80211_ATTR_IFTYPE]);
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+ if (type > NL80211_IFTYPE_MAX)
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+ return -EINVAL;
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+ }
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+
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+ drv = cfg80211_get_dev_from_info(info);
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+ if (IS_ERR(drv))
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+ return PTR_ERR(drv);
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+
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+ if (!drv->ops->add_virtual_intf) {
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+ err = -EOPNOTSUPP;
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+ goto unlock;
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+ }
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+
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+ rtnl_lock();
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+ err = drv->ops->add_virtual_intf(&drv->wiphy,
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+ nla_data(info->attrs[NL80211_ATTR_IFNAME]), type);
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+ rtnl_unlock();
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+
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+ unlock:
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+ cfg80211_put_dev(drv);
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+ return err;
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+}
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+
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+static int nl80211_del_interface(struct sk_buff *skb, struct genl_info *info)
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+{
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+ struct cfg80211_registered_device *drv;
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+ int ifindex, err;
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+ struct net_device *dev;
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+
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+ err = get_drv_dev_by_info_ifindex(info, &drv, &dev);
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+ if (err)
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+ return err;
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+ ifindex = dev->ifindex;
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+ dev_put(dev);
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+
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+ if (!drv->ops->del_virtual_intf) {
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+ err = -EOPNOTSUPP;
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+ goto out;
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+ }
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+
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+ rtnl_lock();
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+ err = drv->ops->del_virtual_intf(&drv->wiphy, ifindex);
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+ rtnl_unlock();
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+
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+ out:
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+ cfg80211_put_dev(drv);
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+ return err;
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+}
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+
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+static struct genl_ops nl80211_ops[] = {
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+ {
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+ .cmd = NL80211_CMD_GET_WIPHY,
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+ .doit = nl80211_get_wiphy,
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+ .dumpit = nl80211_dump_wiphy,
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+ .policy = nl80211_policy,
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+ /* can be retrieved by unprivileged users */
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+ },
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+ {
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+ .cmd = NL80211_CMD_SET_WIPHY,
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+ .doit = nl80211_set_wiphy,
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+ .policy = nl80211_policy,
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+ .flags = GENL_ADMIN_PERM,
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+ },
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+ {
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+ .cmd = NL80211_CMD_GET_INTERFACE,
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+ .doit = nl80211_get_interface,
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+ .dumpit = nl80211_dump_interface,
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+ .policy = nl80211_policy,
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+ /* can be retrieved by unprivileged users */
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+ },
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+ {
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+ .cmd = NL80211_CMD_SET_INTERFACE,
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+ .doit = nl80211_set_interface,
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+ .policy = nl80211_policy,
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+ .flags = GENL_ADMIN_PERM,
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+ },
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+ {
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+ .cmd = NL80211_CMD_NEW_INTERFACE,
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+ .doit = nl80211_new_interface,
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+ .policy = nl80211_policy,
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+ .flags = GENL_ADMIN_PERM,
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+ },
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+ {
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+ .cmd = NL80211_CMD_DEL_INTERFACE,
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+ .doit = nl80211_del_interface,
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+ .policy = nl80211_policy,
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+ .flags = GENL_ADMIN_PERM,
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+ },
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+};
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+
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+/* multicast groups */
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+static struct genl_multicast_group nl80211_config_mcgrp = {
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+ .name = "config",
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+};
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+
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+/* notification functions */
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+
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+void nl80211_notify_dev_rename(struct cfg80211_registered_device *rdev)
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+{
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+ struct sk_buff *msg;
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+
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+ msg = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
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+ if (!msg)
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+ return;
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+
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+ if (nl80211_send_wiphy(msg, 0, 0, 0, rdev) < 0) {
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+ nlmsg_free(msg);
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+ return;
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+ }
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+
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+ genlmsg_multicast(msg, 0, nl80211_config_mcgrp.id, GFP_KERNEL);
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+}
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+
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+/* initialisation/exit functions */
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+
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+int nl80211_init(void)
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+{
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+ int err, i;
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+
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+ err = genl_register_family(&nl80211_fam);
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+ if (err)
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+ return err;
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+
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+ 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);
|
|
|
+}
|
Johannes Berg