![Johannes Berg](/assets/img/avatar_default.png)
So after the previous changes we were still unhappy with how convoluted the API is and decided to make things simpler for everybody. This completely changes the rate control API, now taking into account 802.11n with MCS rates and more control, most drivers don't support that though. Signed-off-by: Felix Fietkau <nbd@openwrt.org> Signed-off-by: Johannes Berg <johannes@sipsolutions.net> Signed-off-by: John W. Linville <linville@tuxdriver.com>
639 lines
16 KiB
C
639 lines
16 KiB
C
/*
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* mac80211_hwsim - software simulator of 802.11 radio(s) for mac80211
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* Copyright (c) 2008, Jouni Malinen <j@w1.fi>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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/*
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* TODO:
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* - IBSS mode simulation (Beacon transmission with competition for "air time")
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* - IEEE 802.11a and 802.11n modes
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* - RX filtering based on filter configuration (data->rx_filter)
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*/
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#include <linux/list.h>
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#include <linux/spinlock.h>
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#include <net/mac80211.h>
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#include <net/ieee80211_radiotap.h>
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#include <linux/if_arp.h>
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#include <linux/rtnetlink.h>
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#include <linux/etherdevice.h>
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MODULE_AUTHOR("Jouni Malinen");
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MODULE_DESCRIPTION("Software simulator of 802.11 radio(s) for mac80211");
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MODULE_LICENSE("GPL");
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static int radios = 2;
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module_param(radios, int, 0444);
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MODULE_PARM_DESC(radios, "Number of simulated radios");
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struct hwsim_vif_priv {
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u32 magic;
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};
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#define HWSIM_VIF_MAGIC 0x69537748
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static inline void hwsim_check_magic(struct ieee80211_vif *vif)
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{
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struct hwsim_vif_priv *vp = (void *)vif->drv_priv;
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WARN_ON(vp->magic != HWSIM_VIF_MAGIC);
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}
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static inline void hwsim_set_magic(struct ieee80211_vif *vif)
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{
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struct hwsim_vif_priv *vp = (void *)vif->drv_priv;
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vp->magic = HWSIM_VIF_MAGIC;
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}
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static inline void hwsim_clear_magic(struct ieee80211_vif *vif)
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{
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struct hwsim_vif_priv *vp = (void *)vif->drv_priv;
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vp->magic = 0;
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}
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struct hwsim_sta_priv {
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u32 magic;
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};
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#define HWSIM_STA_MAGIC 0x6d537748
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static inline void hwsim_check_sta_magic(struct ieee80211_sta *sta)
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{
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struct hwsim_sta_priv *sp = (void *)sta->drv_priv;
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WARN_ON(sp->magic != HWSIM_STA_MAGIC);
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}
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static inline void hwsim_set_sta_magic(struct ieee80211_sta *sta)
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{
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struct hwsim_sta_priv *sp = (void *)sta->drv_priv;
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sp->magic = HWSIM_STA_MAGIC;
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}
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static inline void hwsim_clear_sta_magic(struct ieee80211_sta *sta)
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{
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struct hwsim_sta_priv *sp = (void *)sta->drv_priv;
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sp->magic = 0;
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}
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static struct class *hwsim_class;
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static struct net_device *hwsim_mon; /* global monitor netdev */
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static const struct ieee80211_channel hwsim_channels[] = {
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{ .center_freq = 2412 },
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{ .center_freq = 2417 },
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{ .center_freq = 2422 },
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{ .center_freq = 2427 },
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{ .center_freq = 2432 },
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{ .center_freq = 2437 },
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{ .center_freq = 2442 },
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{ .center_freq = 2447 },
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{ .center_freq = 2452 },
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{ .center_freq = 2457 },
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{ .center_freq = 2462 },
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{ .center_freq = 2467 },
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{ .center_freq = 2472 },
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{ .center_freq = 2484 },
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};
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static const struct ieee80211_rate hwsim_rates[] = {
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{ .bitrate = 10 },
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{ .bitrate = 20, .flags = IEEE80211_RATE_SHORT_PREAMBLE },
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{ .bitrate = 55, .flags = IEEE80211_RATE_SHORT_PREAMBLE },
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{ .bitrate = 110, .flags = IEEE80211_RATE_SHORT_PREAMBLE },
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{ .bitrate = 60 },
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{ .bitrate = 90 },
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{ .bitrate = 120 },
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{ .bitrate = 180 },
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{ .bitrate = 240 },
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{ .bitrate = 360 },
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{ .bitrate = 480 },
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{ .bitrate = 540 }
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};
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static spinlock_t hwsim_radio_lock;
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static struct list_head hwsim_radios;
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struct mac80211_hwsim_data {
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struct list_head list;
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struct ieee80211_hw *hw;
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struct device *dev;
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struct ieee80211_supported_band band;
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struct ieee80211_channel channels[ARRAY_SIZE(hwsim_channels)];
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struct ieee80211_rate rates[ARRAY_SIZE(hwsim_rates)];
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struct ieee80211_channel *channel;
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int radio_enabled;
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unsigned long beacon_int; /* in jiffies unit */
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unsigned int rx_filter;
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int started;
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struct timer_list beacon_timer;
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};
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struct hwsim_radiotap_hdr {
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struct ieee80211_radiotap_header hdr;
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u8 rt_flags;
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u8 rt_rate;
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__le16 rt_channel;
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__le16 rt_chbitmask;
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} __attribute__ ((packed));
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static int hwsim_mon_xmit(struct sk_buff *skb, struct net_device *dev)
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{
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/* TODO: allow packet injection */
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dev_kfree_skb(skb);
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return 0;
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}
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static void mac80211_hwsim_monitor_rx(struct ieee80211_hw *hw,
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struct sk_buff *tx_skb)
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{
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struct mac80211_hwsim_data *data = hw->priv;
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struct sk_buff *skb;
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struct hwsim_radiotap_hdr *hdr;
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u16 flags;
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struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx_skb);
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struct ieee80211_rate *txrate = ieee80211_get_tx_rate(hw, info);
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if (!netif_running(hwsim_mon))
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return;
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skb = skb_copy_expand(tx_skb, sizeof(*hdr), 0, GFP_ATOMIC);
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if (skb == NULL)
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return;
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hdr = (struct hwsim_radiotap_hdr *) skb_push(skb, sizeof(*hdr));
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hdr->hdr.it_version = PKTHDR_RADIOTAP_VERSION;
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hdr->hdr.it_pad = 0;
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hdr->hdr.it_len = cpu_to_le16(sizeof(*hdr));
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hdr->hdr.it_present = cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) |
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(1 << IEEE80211_RADIOTAP_RATE) |
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(1 << IEEE80211_RADIOTAP_CHANNEL));
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hdr->rt_flags = 0;
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hdr->rt_rate = txrate->bitrate / 5;
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hdr->rt_channel = cpu_to_le16(data->channel->center_freq);
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flags = IEEE80211_CHAN_2GHZ;
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if (txrate->flags & IEEE80211_RATE_ERP_G)
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flags |= IEEE80211_CHAN_OFDM;
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else
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flags |= IEEE80211_CHAN_CCK;
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hdr->rt_chbitmask = cpu_to_le16(flags);
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skb->dev = hwsim_mon;
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skb_set_mac_header(skb, 0);
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skb->ip_summed = CHECKSUM_UNNECESSARY;
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skb->pkt_type = PACKET_OTHERHOST;
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skb->protocol = htons(ETH_P_802_2);
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memset(skb->cb, 0, sizeof(skb->cb));
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netif_rx(skb);
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}
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static bool mac80211_hwsim_tx_frame(struct ieee80211_hw *hw,
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struct sk_buff *skb)
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{
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struct mac80211_hwsim_data *data = hw->priv, *data2;
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bool ack = false;
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struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
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struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
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struct ieee80211_rx_status rx_status;
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memset(&rx_status, 0, sizeof(rx_status));
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/* TODO: set mactime */
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rx_status.freq = data->channel->center_freq;
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rx_status.band = data->channel->band;
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rx_status.rate_idx = info->control.rates[0].idx;
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/* TODO: simulate signal strength (and optional packet drop) */
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/* Copy skb to all enabled radios that are on the current frequency */
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spin_lock(&hwsim_radio_lock);
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list_for_each_entry(data2, &hwsim_radios, list) {
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struct sk_buff *nskb;
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if (data == data2)
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continue;
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if (!data2->started || !data2->radio_enabled ||
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data->channel->center_freq != data2->channel->center_freq)
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continue;
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nskb = skb_copy(skb, GFP_ATOMIC);
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if (nskb == NULL)
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continue;
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if (memcmp(hdr->addr1, data2->hw->wiphy->perm_addr,
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ETH_ALEN) == 0)
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ack = true;
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ieee80211_rx_irqsafe(data2->hw, nskb, &rx_status);
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}
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spin_unlock(&hwsim_radio_lock);
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return ack;
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}
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static int mac80211_hwsim_tx(struct ieee80211_hw *hw, struct sk_buff *skb)
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{
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struct mac80211_hwsim_data *data = hw->priv;
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bool ack;
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struct ieee80211_tx_info *txi;
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mac80211_hwsim_monitor_rx(hw, skb);
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if (skb->len < 10) {
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/* Should not happen; just a sanity check for addr1 use */
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dev_kfree_skb(skb);
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return NETDEV_TX_OK;
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}
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if (!data->radio_enabled) {
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printk(KERN_DEBUG "%s: dropped TX frame since radio "
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"disabled\n", wiphy_name(hw->wiphy));
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dev_kfree_skb(skb);
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return NETDEV_TX_OK;
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}
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ack = mac80211_hwsim_tx_frame(hw, skb);
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txi = IEEE80211_SKB_CB(skb);
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if (txi->control.vif)
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hwsim_check_magic(txi->control.vif);
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if (txi->control.sta)
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hwsim_check_sta_magic(txi->control.sta);
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ieee80211_tx_info_clear_status(txi);
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if (!(txi->flags & IEEE80211_TX_CTL_NO_ACK) && ack)
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txi->flags |= IEEE80211_TX_STAT_ACK;
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ieee80211_tx_status_irqsafe(hw, skb);
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return NETDEV_TX_OK;
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}
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static int mac80211_hwsim_start(struct ieee80211_hw *hw)
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{
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struct mac80211_hwsim_data *data = hw->priv;
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printk(KERN_DEBUG "%s:%s\n", wiphy_name(hw->wiphy), __func__);
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data->started = 1;
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return 0;
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}
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static void mac80211_hwsim_stop(struct ieee80211_hw *hw)
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{
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struct mac80211_hwsim_data *data = hw->priv;
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data->started = 0;
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printk(KERN_DEBUG "%s:%s\n", wiphy_name(hw->wiphy), __func__);
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}
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static int mac80211_hwsim_add_interface(struct ieee80211_hw *hw,
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struct ieee80211_if_init_conf *conf)
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{
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printk(KERN_DEBUG "%s:%s (type=%d mac_addr=%pM)\n",
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wiphy_name(hw->wiphy), __func__, conf->type,
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conf->mac_addr);
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hwsim_set_magic(conf->vif);
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return 0;
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}
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static void mac80211_hwsim_remove_interface(
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struct ieee80211_hw *hw, struct ieee80211_if_init_conf *conf)
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{
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printk(KERN_DEBUG "%s:%s (type=%d mac_addr=%pM)\n",
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wiphy_name(hw->wiphy), __func__, conf->type,
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conf->mac_addr);
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hwsim_check_magic(conf->vif);
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hwsim_clear_magic(conf->vif);
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}
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static void mac80211_hwsim_beacon_tx(void *arg, u8 *mac,
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struct ieee80211_vif *vif)
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{
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struct ieee80211_hw *hw = arg;
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struct sk_buff *skb;
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struct ieee80211_tx_info *info;
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hwsim_check_magic(vif);
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if (vif->type != NL80211_IFTYPE_AP)
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return;
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skb = ieee80211_beacon_get(hw, vif);
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if (skb == NULL)
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return;
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info = IEEE80211_SKB_CB(skb);
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mac80211_hwsim_monitor_rx(hw, skb);
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mac80211_hwsim_tx_frame(hw, skb);
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dev_kfree_skb(skb);
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}
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static void mac80211_hwsim_beacon(unsigned long arg)
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{
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struct ieee80211_hw *hw = (struct ieee80211_hw *) arg;
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struct mac80211_hwsim_data *data = hw->priv;
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if (!data->started || !data->radio_enabled)
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return;
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ieee80211_iterate_active_interfaces_atomic(
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hw, mac80211_hwsim_beacon_tx, hw);
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data->beacon_timer.expires = jiffies + data->beacon_int;
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add_timer(&data->beacon_timer);
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}
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static int mac80211_hwsim_config(struct ieee80211_hw *hw, u32 changed)
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{
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struct mac80211_hwsim_data *data = hw->priv;
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struct ieee80211_conf *conf = &hw->conf;
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printk(KERN_DEBUG "%s:%s (freq=%d radio_enabled=%d beacon_int=%d)\n",
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wiphy_name(hw->wiphy), __func__,
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conf->channel->center_freq, conf->radio_enabled,
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conf->beacon_int);
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data->channel = conf->channel;
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data->radio_enabled = conf->radio_enabled;
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data->beacon_int = 1024 * conf->beacon_int / 1000 * HZ / 1000;
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if (data->beacon_int < 1)
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data->beacon_int = 1;
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if (!data->started || !data->radio_enabled)
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del_timer(&data->beacon_timer);
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else
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mod_timer(&data->beacon_timer, jiffies + data->beacon_int);
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return 0;
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}
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static void mac80211_hwsim_configure_filter(struct ieee80211_hw *hw,
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unsigned int changed_flags,
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unsigned int *total_flags,
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int mc_count,
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struct dev_addr_list *mc_list)
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{
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struct mac80211_hwsim_data *data = hw->priv;
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printk(KERN_DEBUG "%s:%s\n", wiphy_name(hw->wiphy), __func__);
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data->rx_filter = 0;
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if (*total_flags & FIF_PROMISC_IN_BSS)
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data->rx_filter |= FIF_PROMISC_IN_BSS;
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if (*total_flags & FIF_ALLMULTI)
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data->rx_filter |= FIF_ALLMULTI;
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*total_flags = data->rx_filter;
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}
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static int mac80211_hwsim_config_interface(struct ieee80211_hw *hw,
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struct ieee80211_vif *vif,
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struct ieee80211_if_conf *conf)
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{
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hwsim_check_magic(vif);
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return 0;
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}
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static void mac80211_hwsim_bss_info_changed(struct ieee80211_hw *hw,
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struct ieee80211_vif *vif,
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struct ieee80211_bss_conf *info,
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u32 changed)
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{
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hwsim_check_magic(vif);
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}
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static void mac80211_hwsim_sta_notify(struct ieee80211_hw *hw,
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struct ieee80211_vif *vif,
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enum sta_notify_cmd cmd,
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struct ieee80211_sta *sta)
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{
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hwsim_check_magic(vif);
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switch (cmd) {
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case STA_NOTIFY_ADD:
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hwsim_set_sta_magic(sta);
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break;
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case STA_NOTIFY_REMOVE:
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hwsim_clear_sta_magic(sta);
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break;
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}
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}
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static int mac80211_hwsim_set_tim(struct ieee80211_hw *hw,
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struct ieee80211_sta *sta,
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bool set)
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{
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hwsim_check_sta_magic(sta);
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return 0;
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}
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static const struct ieee80211_ops mac80211_hwsim_ops =
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{
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.tx = mac80211_hwsim_tx,
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.start = mac80211_hwsim_start,
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.stop = mac80211_hwsim_stop,
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.add_interface = mac80211_hwsim_add_interface,
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.remove_interface = mac80211_hwsim_remove_interface,
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.config = mac80211_hwsim_config,
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.configure_filter = mac80211_hwsim_configure_filter,
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.config_interface = mac80211_hwsim_config_interface,
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.bss_info_changed = mac80211_hwsim_bss_info_changed,
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.sta_notify = mac80211_hwsim_sta_notify,
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.set_tim = mac80211_hwsim_set_tim,
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};
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static void mac80211_hwsim_free(void)
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{
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struct list_head tmplist, *i, *tmp;
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struct mac80211_hwsim_data *data;
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INIT_LIST_HEAD(&tmplist);
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spin_lock_bh(&hwsim_radio_lock);
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list_for_each_safe(i, tmp, &hwsim_radios)
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list_move(i, &tmplist);
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spin_unlock_bh(&hwsim_radio_lock);
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list_for_each_entry(data, &tmplist, list) {
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ieee80211_unregister_hw(data->hw);
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device_unregister(data->dev);
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ieee80211_free_hw(data->hw);
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}
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class_destroy(hwsim_class);
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}
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static struct device_driver mac80211_hwsim_driver = {
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.name = "mac80211_hwsim"
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};
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static void hwsim_mon_setup(struct net_device *dev)
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{
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dev->hard_start_xmit = hwsim_mon_xmit;
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dev->destructor = free_netdev;
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ether_setup(dev);
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dev->tx_queue_len = 0;
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dev->type = ARPHRD_IEEE80211_RADIOTAP;
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memset(dev->dev_addr, 0, ETH_ALEN);
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dev->dev_addr[0] = 0x12;
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}
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static int __init init_mac80211_hwsim(void)
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{
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int i, err = 0;
|
|
u8 addr[ETH_ALEN];
|
|
struct mac80211_hwsim_data *data;
|
|
struct ieee80211_hw *hw;
|
|
|
|
if (radios < 1 || radios > 100)
|
|
return -EINVAL;
|
|
|
|
spin_lock_init(&hwsim_radio_lock);
|
|
INIT_LIST_HEAD(&hwsim_radios);
|
|
|
|
hwsim_class = class_create(THIS_MODULE, "mac80211_hwsim");
|
|
if (IS_ERR(hwsim_class))
|
|
return PTR_ERR(hwsim_class);
|
|
|
|
memset(addr, 0, ETH_ALEN);
|
|
addr[0] = 0x02;
|
|
|
|
for (i = 0; i < radios; i++) {
|
|
printk(KERN_DEBUG "mac80211_hwsim: Initializing radio %d\n",
|
|
i);
|
|
hw = ieee80211_alloc_hw(sizeof(*data), &mac80211_hwsim_ops);
|
|
if (!hw) {
|
|
printk(KERN_DEBUG "mac80211_hwsim: ieee80211_alloc_hw "
|
|
"failed\n");
|
|
err = -ENOMEM;
|
|
goto failed;
|
|
}
|
|
data = hw->priv;
|
|
data->hw = hw;
|
|
|
|
data->dev = device_create(hwsim_class, NULL, 0, hw,
|
|
"hwsim%d", i);
|
|
if (IS_ERR(data->dev)) {
|
|
printk(KERN_DEBUG
|
|
"mac80211_hwsim: device_create "
|
|
"failed (%ld)\n", PTR_ERR(data->dev));
|
|
err = -ENOMEM;
|
|
goto failed_drvdata;
|
|
}
|
|
data->dev->driver = &mac80211_hwsim_driver;
|
|
|
|
SET_IEEE80211_DEV(hw, data->dev);
|
|
addr[3] = i >> 8;
|
|
addr[4] = i;
|
|
SET_IEEE80211_PERM_ADDR(hw, addr);
|
|
|
|
hw->channel_change_time = 1;
|
|
hw->queues = 4;
|
|
hw->wiphy->interface_modes =
|
|
BIT(NL80211_IFTYPE_STATION) |
|
|
BIT(NL80211_IFTYPE_AP);
|
|
hw->ampdu_queues = 1;
|
|
|
|
/* ask mac80211 to reserve space for magic */
|
|
hw->vif_data_size = sizeof(struct hwsim_vif_priv);
|
|
hw->sta_data_size = sizeof(struct hwsim_sta_priv);
|
|
|
|
memcpy(data->channels, hwsim_channels, sizeof(hwsim_channels));
|
|
memcpy(data->rates, hwsim_rates, sizeof(hwsim_rates));
|
|
data->band.channels = data->channels;
|
|
data->band.n_channels = ARRAY_SIZE(hwsim_channels);
|
|
data->band.bitrates = data->rates;
|
|
data->band.n_bitrates = ARRAY_SIZE(hwsim_rates);
|
|
data->band.ht_cap.ht_supported = true;
|
|
data->band.ht_cap.cap = IEEE80211_HT_CAP_SUP_WIDTH_20_40 |
|
|
IEEE80211_HT_CAP_GRN_FLD |
|
|
IEEE80211_HT_CAP_SGI_40 |
|
|
IEEE80211_HT_CAP_DSSSCCK40;
|
|
data->band.ht_cap.ampdu_factor = 0x3;
|
|
data->band.ht_cap.ampdu_density = 0x6;
|
|
memset(&data->band.ht_cap.mcs, 0,
|
|
sizeof(data->band.ht_cap.mcs));
|
|
data->band.ht_cap.mcs.rx_mask[0] = 0xff;
|
|
data->band.ht_cap.mcs.rx_mask[1] = 0xff;
|
|
data->band.ht_cap.mcs.tx_params = IEEE80211_HT_MCS_TX_DEFINED;
|
|
hw->wiphy->bands[IEEE80211_BAND_2GHZ] = &data->band;
|
|
|
|
err = ieee80211_register_hw(hw);
|
|
if (err < 0) {
|
|
printk(KERN_DEBUG "mac80211_hwsim: "
|
|
"ieee80211_register_hw failed (%d)\n", err);
|
|
goto failed_hw;
|
|
}
|
|
|
|
printk(KERN_DEBUG "%s: hwaddr %pM registered\n",
|
|
wiphy_name(hw->wiphy),
|
|
hw->wiphy->perm_addr);
|
|
|
|
setup_timer(&data->beacon_timer, mac80211_hwsim_beacon,
|
|
(unsigned long) hw);
|
|
|
|
list_add_tail(&data->list, &hwsim_radios);
|
|
}
|
|
|
|
hwsim_mon = alloc_netdev(0, "hwsim%d", hwsim_mon_setup);
|
|
if (hwsim_mon == NULL)
|
|
goto failed;
|
|
|
|
rtnl_lock();
|
|
|
|
err = dev_alloc_name(hwsim_mon, hwsim_mon->name);
|
|
if (err < 0)
|
|
goto failed_mon;
|
|
|
|
|
|
err = register_netdevice(hwsim_mon);
|
|
if (err < 0)
|
|
goto failed_mon;
|
|
|
|
rtnl_unlock();
|
|
|
|
return 0;
|
|
|
|
failed_mon:
|
|
rtnl_unlock();
|
|
free_netdev(hwsim_mon);
|
|
mac80211_hwsim_free();
|
|
return err;
|
|
|
|
failed_hw:
|
|
device_unregister(data->dev);
|
|
failed_drvdata:
|
|
ieee80211_free_hw(hw);
|
|
failed:
|
|
mac80211_hwsim_free();
|
|
return err;
|
|
}
|
|
|
|
|
|
static void __exit exit_mac80211_hwsim(void)
|
|
{
|
|
printk(KERN_DEBUG "mac80211_hwsim: unregister radios\n");
|
|
|
|
unregister_netdev(hwsim_mon);
|
|
mac80211_hwsim_free();
|
|
}
|
|
|
|
|
|
module_init(init_mac80211_hwsim);
|
|
module_exit(exit_mac80211_hwsim);
|