/* * Some IBSS support code for cfg80211. * * Copyright 2009 Johannes Berg <johannes@sipsolutions.net> */ #include <linux/etherdevice.h> #include <linux/if_arp.h> #include <net/cfg80211.h> #include "nl80211.h" void cfg80211_ibss_joined(struct net_device *dev, const u8 *bssid, gfp_t gfp) { struct wireless_dev *wdev = dev->ieee80211_ptr; struct cfg80211_bss *bss; #ifdef CONFIG_WIRELESS_EXT union iwreq_data wrqu; #endif if (WARN_ON(wdev->iftype != NL80211_IFTYPE_ADHOC)) return; if (WARN_ON(!wdev->ssid_len)) return; if (memcmp(bssid, wdev->bssid, ETH_ALEN) == 0) return; bss = cfg80211_get_bss(wdev->wiphy, NULL, bssid, wdev->ssid, wdev->ssid_len, WLAN_CAPABILITY_IBSS, WLAN_CAPABILITY_IBSS); if (WARN_ON(!bss)) return; if (wdev->current_bss) { cfg80211_unhold_bss(wdev->current_bss); cfg80211_put_bss(wdev->current_bss); } cfg80211_hold_bss(bss); wdev->current_bss = bss; memcpy(wdev->bssid, bssid, ETH_ALEN); nl80211_send_ibss_bssid(wiphy_to_dev(wdev->wiphy), dev, bssid, gfp); #ifdef CONFIG_WIRELESS_EXT memset(&wrqu, 0, sizeof(wrqu)); memcpy(wrqu.ap_addr.sa_data, bssid, ETH_ALEN); wireless_send_event(dev, SIOCGIWAP, &wrqu, NULL); #endif } EXPORT_SYMBOL(cfg80211_ibss_joined); int cfg80211_join_ibss(struct cfg80211_registered_device *rdev, struct net_device *dev, struct cfg80211_ibss_params *params) { struct wireless_dev *wdev = dev->ieee80211_ptr; int err; if (wdev->ssid_len) return -EALREADY; #ifdef CONFIG_WIRELESS_EXT wdev->wext.ibss.channel = params->channel; #endif err = rdev->ops->join_ibss(&rdev->wiphy, dev, params); if (err) return err; memcpy(wdev->ssid, params->ssid, params->ssid_len); wdev->ssid_len = params->ssid_len; return 0; } void cfg80211_clear_ibss(struct net_device *dev, bool nowext) { struct wireless_dev *wdev = dev->ieee80211_ptr; if (wdev->current_bss) { cfg80211_unhold_bss(wdev->current_bss); cfg80211_put_bss(wdev->current_bss); } wdev->current_bss = NULL; wdev->ssid_len = 0; memset(wdev->bssid, 0, ETH_ALEN); #ifdef CONFIG_WIRELESS_EXT if (!nowext) wdev->wext.ibss.ssid_len = 0; #endif } int cfg80211_leave_ibss(struct cfg80211_registered_device *rdev, struct net_device *dev, bool nowext) { int err; err = rdev->ops->leave_ibss(&rdev->wiphy, dev); if (err) return err; cfg80211_clear_ibss(dev, nowext); return 0; } #ifdef CONFIG_WIRELESS_EXT static int cfg80211_ibss_wext_join(struct cfg80211_registered_device *rdev, struct wireless_dev *wdev) { enum ieee80211_band band; int i; if (!wdev->wext.ibss.beacon_interval) wdev->wext.ibss.beacon_interval = 100; /* try to find an IBSS channel if none requested ... */ if (!wdev->wext.ibss.channel) { for (band = 0; band < IEEE80211_NUM_BANDS; band++) { struct ieee80211_supported_band *sband; struct ieee80211_channel *chan; sband = rdev->wiphy.bands[band]; if (!sband) continue; for (i = 0; i < sband->n_channels; i++) { chan = &sband->channels[i]; if (chan->flags & IEEE80211_CHAN_NO_IBSS) continue; if (chan->flags & IEEE80211_CHAN_DISABLED) continue; wdev->wext.ibss.channel = chan; break; } if (wdev->wext.ibss.channel) break; } if (!wdev->wext.ibss.channel) return -EINVAL; } /* don't join -- SSID is not there */ if (!wdev->wext.ibss.ssid_len) return 0; if (!netif_running(wdev->netdev)) return 0; return cfg80211_join_ibss(wiphy_to_dev(wdev->wiphy), wdev->netdev, &wdev->wext.ibss); } int cfg80211_ibss_wext_siwfreq(struct net_device *dev, struct iw_request_info *info, struct iw_freq *freq, char *extra) { struct wireless_dev *wdev = dev->ieee80211_ptr; struct ieee80211_channel *chan; int err; /* call only for ibss! */ if (WARN_ON(wdev->iftype != NL80211_IFTYPE_ADHOC)) return -EINVAL; if (!wiphy_to_dev(wdev->wiphy)->ops->join_ibss) return -EOPNOTSUPP; chan = cfg80211_wext_freq(wdev->wiphy, freq); if (chan && IS_ERR(chan)) return PTR_ERR(chan); if (chan && (chan->flags & IEEE80211_CHAN_NO_IBSS || chan->flags & IEEE80211_CHAN_DISABLED)) return -EINVAL; if (wdev->wext.ibss.channel == chan) return 0; if (wdev->ssid_len) { err = cfg80211_leave_ibss(wiphy_to_dev(wdev->wiphy), dev, true); if (err) return err; } if (chan) { wdev->wext.ibss.channel = chan; wdev->wext.ibss.channel_fixed = true; } else { /* cfg80211_ibss_wext_join will pick one if needed */ wdev->wext.ibss.channel_fixed = false; } return cfg80211_ibss_wext_join(wiphy_to_dev(wdev->wiphy), wdev); } /* temporary symbol - mark GPL - in the future the handler won't be */ EXPORT_SYMBOL_GPL(cfg80211_ibss_wext_siwfreq); int cfg80211_ibss_wext_giwfreq(struct net_device *dev, struct iw_request_info *info, struct iw_freq *freq, char *extra) { struct wireless_dev *wdev = dev->ieee80211_ptr; struct ieee80211_channel *chan = NULL; /* call only for ibss! */ if (WARN_ON(wdev->iftype != NL80211_IFTYPE_ADHOC)) return -EINVAL; if (wdev->current_bss) chan = wdev->current_bss->channel; else if (wdev->wext.ibss.channel) chan = wdev->wext.ibss.channel; if (chan) { freq->m = chan->center_freq; freq->e = 6; return 0; } /* no channel if not joining */ return -EINVAL; } /* temporary symbol - mark GPL - in the future the handler won't be */ EXPORT_SYMBOL_GPL(cfg80211_ibss_wext_giwfreq); int cfg80211_ibss_wext_siwessid(struct net_device *dev, struct iw_request_info *info, struct iw_point *data, char *ssid) { struct wireless_dev *wdev = dev->ieee80211_ptr; size_t len = data->length; int err; /* call only for ibss! */ if (WARN_ON(wdev->iftype != NL80211_IFTYPE_ADHOC)) return -EINVAL; if (!wiphy_to_dev(wdev->wiphy)->ops->join_ibss) return -EOPNOTSUPP; if (wdev->ssid_len) { err = cfg80211_leave_ibss(wiphy_to_dev(wdev->wiphy), dev, true); if (err) return err; } /* iwconfig uses nul termination in SSID.. */ if (len > 0 && ssid[len - 1] == '\0') len--; wdev->wext.ibss.ssid = wdev->ssid; memcpy(wdev->wext.ibss.ssid, ssid, len); wdev->wext.ibss.ssid_len = len; return cfg80211_ibss_wext_join(wiphy_to_dev(wdev->wiphy), wdev); } /* temporary symbol - mark GPL - in the future the handler won't be */ EXPORT_SYMBOL_GPL(cfg80211_ibss_wext_siwessid); int cfg80211_ibss_wext_giwessid(struct net_device *dev, struct iw_request_info *info, struct iw_point *data, char *ssid) { struct wireless_dev *wdev = dev->ieee80211_ptr; /* call only for ibss! */ if (WARN_ON(wdev->iftype != NL80211_IFTYPE_ADHOC)) return -EINVAL; data->flags = 0; if (wdev->ssid_len) { data->flags = 1; data->length = wdev->ssid_len; memcpy(ssid, wdev->ssid, data->length); } else if (wdev->wext.ibss.ssid && wdev->wext.ibss.ssid_len) { data->flags = 1; data->length = wdev->wext.ibss.ssid_len; memcpy(ssid, wdev->wext.ibss.ssid, data->length); } return 0; } /* temporary symbol - mark GPL - in the future the handler won't be */ EXPORT_SYMBOL_GPL(cfg80211_ibss_wext_giwessid); int cfg80211_ibss_wext_siwap(struct net_device *dev, struct iw_request_info *info, struct sockaddr *ap_addr, char *extra) { struct wireless_dev *wdev = dev->ieee80211_ptr; u8 *bssid = ap_addr->sa_data; int err; /* call only for ibss! */ if (WARN_ON(wdev->iftype != NL80211_IFTYPE_ADHOC)) return -EINVAL; if (!wiphy_to_dev(wdev->wiphy)->ops->join_ibss) return -EOPNOTSUPP; if (ap_addr->sa_family != ARPHRD_ETHER) return -EINVAL; /* automatic mode */ if (is_zero_ether_addr(bssid) || is_broadcast_ether_addr(bssid)) bssid = NULL; /* both automatic */ if (!bssid && !wdev->wext.ibss.bssid) return 0; /* fixed already - and no change */ if (wdev->wext.ibss.bssid && bssid && compare_ether_addr(bssid, wdev->wext.ibss.bssid) == 0) return 0; if (wdev->ssid_len) { err = cfg80211_leave_ibss(wiphy_to_dev(wdev->wiphy), dev, true); if (err) return err; } if (bssid) { memcpy(wdev->wext.bssid, bssid, ETH_ALEN); wdev->wext.ibss.bssid = wdev->wext.bssid; } else wdev->wext.ibss.bssid = NULL; return cfg80211_ibss_wext_join(wiphy_to_dev(wdev->wiphy), wdev); } /* temporary symbol - mark GPL - in the future the handler won't be */ EXPORT_SYMBOL_GPL(cfg80211_ibss_wext_siwap); int cfg80211_ibss_wext_giwap(struct net_device *dev, struct iw_request_info *info, struct sockaddr *ap_addr, char *extra) { struct wireless_dev *wdev = dev->ieee80211_ptr; /* call only for ibss! */ if (WARN_ON(wdev->iftype != NL80211_IFTYPE_ADHOC)) return -EINVAL; ap_addr->sa_family = ARPHRD_ETHER; if (wdev->wext.ibss.bssid) { memcpy(ap_addr->sa_data, wdev->wext.ibss.bssid, ETH_ALEN); return 0; } memcpy(ap_addr->sa_data, wdev->bssid, ETH_ALEN); return 0; } /* temporary symbol - mark GPL - in the future the handler won't be */ EXPORT_SYMBOL_GPL(cfg80211_ibss_wext_giwap); #endif