516 lines
13 KiB
C
516 lines
13 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 <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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static struct class *hwsim_class;
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static struct ieee80211_hw **hwsim_radios;
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static int hwsim_radio_count;
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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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struct mac80211_hwsim_data {
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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 = 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 int 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;
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int i, ack = 0;
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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->tx_rate_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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for (i = 0; i < hwsim_radio_count; i++) {
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struct mac80211_hwsim_data *data2;
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struct sk_buff *nskb;
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if (hwsim_radios[i] == NULL || hwsim_radios[i] == hw)
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continue;
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data2 = hwsim_radios[i]->priv;
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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, hwsim_radios[i]->wiphy->perm_addr,
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ETH_ALEN) == 0)
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ack = 1;
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ieee80211_rx_irqsafe(hwsim_radios[i], nskb, &rx_status);
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}
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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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int 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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memset(&txi->status, 0, sizeof(txi->status));
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if (!(txi->flags & IEEE80211_TX_CTL_NO_ACK)) {
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if (ack)
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txi->flags |= IEEE80211_TX_STAT_ACK;
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else
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txi->status.excessive_retries = 1;
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}
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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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DECLARE_MAC_BUF(mac);
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printk(KERN_DEBUG "%s:%s (type=%d mac_addr=%s)\n",
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wiphy_name(hw->wiphy), __func__, conf->type,
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print_mac(mac, conf->mac_addr));
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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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DECLARE_MAC_BUF(mac);
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printk(KERN_DEBUG "%s:%s (type=%d mac_addr=%s)\n",
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wiphy_name(hw->wiphy), __func__, conf->type,
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print_mac(mac, conf->mac_addr));
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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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if (vif->type != IEEE80211_IF_TYPE_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,
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struct ieee80211_conf *conf)
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{
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struct mac80211_hwsim_data *data = hw->priv;
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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 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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};
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static void mac80211_hwsim_free(void)
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{
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int i;
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for (i = 0; i < hwsim_radio_count; i++) {
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if (hwsim_radios[i]) {
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struct mac80211_hwsim_data *data;
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data = hwsim_radios[i]->priv;
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ieee80211_unregister_hw(hwsim_radios[i]);
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if (!IS_ERR(data->dev))
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device_unregister(data->dev);
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ieee80211_free_hw(hwsim_radios[i]);
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}
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}
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kfree(hwsim_radios);
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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;
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u8 addr[ETH_ALEN];
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struct mac80211_hwsim_data *data;
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struct ieee80211_hw *hw;
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DECLARE_MAC_BUF(mac);
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if (radios < 1 || radios > 65535)
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return -EINVAL;
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hwsim_radio_count = radios;
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hwsim_radios = kcalloc(hwsim_radio_count,
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sizeof(struct ieee80211_hw *), GFP_KERNEL);
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if (hwsim_radios == NULL)
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return -ENOMEM;
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hwsim_class = class_create(THIS_MODULE, "mac80211_hwsim");
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if (IS_ERR(hwsim_class)) {
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kfree(hwsim_radios);
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return PTR_ERR(hwsim_class);
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}
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memset(addr, 0, ETH_ALEN);
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addr[0] = 0x02;
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for (i = 0; i < hwsim_radio_count; i++) {
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printk(KERN_DEBUG "mac80211_hwsim: Initializing radio %d\n",
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i);
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hw = ieee80211_alloc_hw(sizeof(*data), &mac80211_hwsim_ops);
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if (hw == NULL) {
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printk(KERN_DEBUG "mac80211_hwsim: ieee80211_alloc_hw "
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"failed\n");
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err = -ENOMEM;
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goto failed;
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}
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hwsim_radios[i] = hw;
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data = hw->priv;
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data->dev = device_create_drvdata(hwsim_class, NULL, 0, hw,
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"hwsim%d", i);
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if (IS_ERR(data->dev)) {
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printk(KERN_DEBUG
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"mac80211_hwsim: device_create_drvdata "
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"failed (%ld)\n", PTR_ERR(data->dev));
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err = -ENOMEM;
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goto failed;
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}
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data->dev->driver = &mac80211_hwsim_driver;
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SET_IEEE80211_DEV(hw, data->dev);
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addr[3] = i >> 8;
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addr[4] = i;
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SET_IEEE80211_PERM_ADDR(hw, addr);
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hw->channel_change_time = 1;
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hw->queues = 1;
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memcpy(data->channels, hwsim_channels, sizeof(hwsim_channels));
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memcpy(data->rates, hwsim_rates, sizeof(hwsim_rates));
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data->band.channels = data->channels;
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data->band.n_channels = ARRAY_SIZE(hwsim_channels);
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data->band.bitrates = data->rates;
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data->band.n_bitrates = ARRAY_SIZE(hwsim_rates);
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hw->wiphy->bands[IEEE80211_BAND_2GHZ] = &data->band;
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err = ieee80211_register_hw(hw);
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if (err < 0) {
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printk(KERN_DEBUG "mac80211_hwsim: "
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"ieee80211_register_hw failed (%d)\n", err);
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goto failed;
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}
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printk(KERN_DEBUG "%s: hwaddr %s registered\n",
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wiphy_name(hw->wiphy),
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print_mac(mac, hw->wiphy->perm_addr));
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setup_timer(&data->beacon_timer, mac80211_hwsim_beacon,
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(unsigned long) hw);
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}
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hwsim_mon = alloc_netdev(0, "hwsim%d", hwsim_mon_setup);
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if (hwsim_mon == NULL)
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goto failed;
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rtnl_lock();
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err = dev_alloc_name(hwsim_mon, hwsim_mon->name);
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if (err < 0) {
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goto failed_mon;
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}
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err = register_netdevice(hwsim_mon);
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if (err < 0)
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goto failed_mon;
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rtnl_unlock();
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return 0;
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failed_mon:
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rtnl_unlock();
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free_netdev(hwsim_mon);
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failed:
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mac80211_hwsim_free();
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return err;
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}
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static void __exit exit_mac80211_hwsim(void)
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{
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printk(KERN_DEBUG "mac80211_hwsim: unregister %d radios\n",
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hwsim_radio_count);
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unregister_netdev(hwsim_mon);
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mac80211_hwsim_free();
|
|
}
|
|
|
|
|
|
module_init(init_mac80211_hwsim);
|
|
module_exit(exit_mac80211_hwsim);
|