[NL80211]: add netlink interface to cfg80211
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>
This commit is contained in:
Johannes Berg
committed by
David S. Miller
David S. Miller
parent
0800f17026
commit
5568296573
431
net/wireless/nl80211.c
Normal file
431
net/wireless/nl80211.c
Normal file
@ -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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#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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/* 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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/* 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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if (!info->attrs[NL80211_ATTR_IFINDEX])
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return -EINVAL;
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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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*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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return 0;
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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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[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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/* 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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/* netlink command implementations */
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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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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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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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nla_put_failure:
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return genlmsg_cancel(msg, hdr);
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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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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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cb->args[0] = idx;
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return skb->len;
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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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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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msg = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
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if (!msg)
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goto out_err;
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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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cfg80211_put_dev(dev);
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return genlmsg_unicast(msg, info->snd_pid);
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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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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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if (!info->attrs[NL80211_ATTR_WIPHY_NAME])
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return -EINVAL;
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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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result = cfg80211_dev_rename(rdev, nla_data(info->attrs[NL80211_ATTR_WIPHY_NAME]));
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cfg80211_put_dev(rdev);
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return result;
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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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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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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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nla_put_failure:
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return genlmsg_cancel(msg, hdr);
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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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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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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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cb->args[0] = wp_idx;
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cb->args[1] = if_idx;
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return skb->len;
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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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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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msg = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
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if (!msg)
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goto out_err;
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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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dev_put(netdev);
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cfg80211_put_dev(dev);
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return genlmsg_unicast(msg, info->snd_pid);
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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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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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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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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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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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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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unlock:
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cfg80211_put_dev(drv);
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return err;
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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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if (!info->attrs[NL80211_ATTR_IFNAME])
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return -EINVAL;
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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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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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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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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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unlock:
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cfg80211_put_dev(drv);
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return err;
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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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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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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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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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out:
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cfg80211_put_dev(drv);
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return err;
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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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/* 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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/* notification functions */
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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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msg = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
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if (!msg)
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return;
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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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genlmsg_multicast(msg, 0, nl80211_config_mcgrp.id, GFP_KERNEL);
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}
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/* initialisation/exit functions */
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int nl80211_init(void)
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{
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int err, i;
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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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for (i = 0; i < ARRAY_SIZE(nl80211_ops); i++) {
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err = genl_register_ops(&nl80211_fam, &nl80211_ops[i]);
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if (err)
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goto err_out;
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}
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err = genl_register_mc_group(&nl80211_fam, &nl80211_config_mcgrp);
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if (err)
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goto err_out;
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return 0;
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err_out:
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genl_unregister_family(&nl80211_fam);
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return err;
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}
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void nl80211_exit(void)
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{
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genl_unregister_family(&nl80211_fam);
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}
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