diff options
| -rw-r--r-- | Documentation/networking/mac80211-injection.txt | 17 | ||||
| -rw-r--r-- | include/net/mac80211.h | 2 | ||||
| -rw-r--r-- | net/mac80211/tx.c | 72 |
3 files changed, 89 insertions, 2 deletions
diff --git a/Documentation/networking/mac80211-injection.txt b/Documentation/networking/mac80211-injection.txt index 3a930072b161..ec8f934c2eb2 100644 --- a/Documentation/networking/mac80211-injection.txt +++ b/Documentation/networking/mac80211-injection.txt @@ -28,6 +28,23 @@ radiotap headers and used to control injection: IEEE80211_RADIOTAP_F_TX_NOACK: frame should be sent without waiting for an ACK even if it is a unicast frame + * IEEE80211_RADIOTAP_RATE + + legacy rate for the transmission (only for devices without own rate control) + + * IEEE80211_RADIOTAP_MCS + + HT rate for the transmission (only for devices without own rate control). + Also some flags are parsed + + IEEE80211_TX_RC_SHORT_GI: use short guard interval + IEEE80211_TX_RC_40_MHZ_WIDTH: send in HT40 mode + + * IEEE80211_RADIOTAP_DATA_RETRIES + + number of retries when either IEEE80211_RADIOTAP_RATE or + IEEE80211_RADIOTAP_MCS was used + The injection code can also skip all other currently defined radiotap fields facilitating replay of captured radiotap headers directly. diff --git a/include/net/mac80211.h b/include/net/mac80211.h index 31337f81ec03..dbcd69a6bfda 100644 --- a/include/net/mac80211.h +++ b/include/net/mac80211.h @@ -708,12 +708,14 @@ enum mac80211_tx_info_flags { * protocol frame (e.g. EAP) * @IEEE80211_TX_CTRL_PS_RESPONSE: This frame is a response to a poll * frame (PS-Poll or uAPSD). + * @IEEE80211_TX_CTRL_RATE_INJECT: This frame is injected with rate information * * These flags are used in tx_info->control.flags. */ enum mac80211_tx_control_flags { IEEE80211_TX_CTRL_PORT_CTRL_PROTO = BIT(0), IEEE80211_TX_CTRL_PS_RESPONSE = BIT(1), + IEEE80211_TX_CTRL_RATE_INJECT = BIT(2), }; /* diff --git a/net/mac80211/tx.c b/net/mac80211/tx.c index 3311ce0f3d6c..723cd7aa8953 100644 --- a/net/mac80211/tx.c +++ b/net/mac80211/tx.c @@ -710,6 +710,10 @@ ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data *tx) info->control.short_preamble = txrc.short_preamble; + /* don't ask rate control when rate already injected via radiotap */ + if (info->control.flags & IEEE80211_TX_CTRL_RATE_INJECT) + return TX_CONTINUE; + if (tx->sta) assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC); @@ -1665,15 +1669,24 @@ void ieee80211_xmit(struct ieee80211_sub_if_data *sdata, ieee80211_tx(sdata, sta, skb, false); } -static bool ieee80211_parse_tx_radiotap(struct sk_buff *skb) +static bool ieee80211_parse_tx_radiotap(struct ieee80211_local *local, + struct sk_buff *skb) { struct ieee80211_radiotap_iterator iterator; struct ieee80211_radiotap_header *rthdr = (struct ieee80211_radiotap_header *) skb->data; struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); + struct ieee80211_supported_band *sband = + local->hw.wiphy->bands[info->band]; int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len, NULL); u16 txflags; + u16 rate = 0; + bool rate_found = false; + u8 rate_retries = 0; + u16 rate_flags = 0; + u8 mcs_known, mcs_flags; + int i; info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT | IEEE80211_TX_CTL_DONTFRAG; @@ -1724,6 +1737,35 @@ static bool ieee80211_parse_tx_radiotap(struct sk_buff *skb) info->flags |= IEEE80211_TX_CTL_NO_ACK; break; + case IEEE80211_RADIOTAP_RATE: + rate = *iterator.this_arg; + rate_flags = 0; + rate_found = true; + break; + + case IEEE80211_RADIOTAP_DATA_RETRIES: + rate_retries = *iterator.this_arg; + break; + + case IEEE80211_RADIOTAP_MCS: + mcs_known = iterator.this_arg[0]; + mcs_flags = iterator.this_arg[1]; + if (!(mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_MCS)) + break; + + rate_found = true; + rate = iterator.this_arg[2]; + rate_flags = IEEE80211_TX_RC_MCS; + + if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_GI && + mcs_flags & IEEE80211_RADIOTAP_MCS_SGI) + rate_flags |= IEEE80211_TX_RC_SHORT_GI; + + if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_BW && + mcs_flags & IEEE80211_RADIOTAP_MCS_BW_40) + rate_flags |= IEEE80211_TX_RC_40_MHZ_WIDTH; + break; + /* * Please update the file * Documentation/networking/mac80211-injection.txt @@ -1738,6 +1780,32 @@ static bool ieee80211_parse_tx_radiotap(struct sk_buff *skb) if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */ return false; + if (rate_found) { + info->control.flags |= IEEE80211_TX_CTRL_RATE_INJECT; + + for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) { + info->control.rates[i].idx = -1; + info->control.rates[i].flags = 0; + info->control.rates[i].count = 0; + } + + if (rate_flags & IEEE80211_TX_RC_MCS) { + info->control.rates[0].idx = rate; + } else { + for (i = 0; i < sband->n_bitrates; i++) { + if (rate * 5 != sband->bitrates[i].bitrate) + continue; + + info->control.rates[0].idx = i; + break; + } + } + + info->control.rates[0].flags = rate_flags; + info->control.rates[0].count = min_t(u8, rate_retries + 1, + local->hw.max_rate_tries); + } + /* * remove the radiotap header * iterator->_max_length was sanity-checked against @@ -1819,7 +1887,7 @@ netdev_tx_t ieee80211_monitor_start_xmit(struct sk_buff *skb, IEEE80211_TX_CTL_INJECTED; /* process and remove the injection radiotap header */ - if (!ieee80211_parse_tx_radiotap(skb)) + if (!ieee80211_parse_tx_radiotap(local, skb)) goto fail; rcu_read_lock(); |