mac80211: optimise monitor xmit
Since the only way the interface can be a monitor interface in ieee80211_xmit() is because the frame came from ieee80211_monitor_start_xmit() we can move all the code there. Signed-off-by: Johannes Berg <johannes.berg@intel.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Johannes Berg
John W. Linville
Родитель
d9cd48f95c
Коммит
5d9cf4a5d7
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@ -1539,55 +1539,11 @@ void ieee80211_xmit(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb)
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struct ieee80211_local *local = sdata->local;
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struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
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struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
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struct ieee80211_sub_if_data *tmp_sdata;
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int headroom;
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bool may_encrypt;
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rcu_read_lock();
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if (unlikely(sdata->vif.type == NL80211_IFTYPE_MONITOR)) {
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int hdrlen;
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u16 len_rthdr;
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info->flags |= IEEE80211_TX_CTL_INJECTED |
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IEEE80211_TX_INTFL_HAS_RADIOTAP;
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len_rthdr = ieee80211_get_radiotap_len(skb->data);
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hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr);
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hdrlen = ieee80211_hdrlen(hdr->frame_control);
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/* check the header is complete in the frame */
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if (likely(skb->len >= len_rthdr + hdrlen)) {
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/*
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* We process outgoing injected frames that have a
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* local address we handle as though they are our
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* own frames.
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* This code here isn't entirely correct, the local
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* MAC address is not necessarily enough to find
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* the interface to use; for that proper VLAN/WDS
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* support we will need a different mechanism.
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*/
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list_for_each_entry_rcu(tmp_sdata, &local->interfaces,
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list) {
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if (!ieee80211_sdata_running(tmp_sdata))
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continue;
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if (tmp_sdata->vif.type ==
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NL80211_IFTYPE_MONITOR ||
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tmp_sdata->vif.type ==
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NL80211_IFTYPE_AP_VLAN ||
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tmp_sdata->vif.type ==
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NL80211_IFTYPE_WDS)
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continue;
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if (compare_ether_addr(tmp_sdata->vif.addr,
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hdr->addr2) == 0) {
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sdata = tmp_sdata;
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break;
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}
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}
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}
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}
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may_encrypt = !(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT);
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headroom = local->tx_headroom;
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@ -1628,8 +1584,9 @@ netdev_tx_t ieee80211_monitor_start_xmit(struct sk_buff *skb,
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(struct ieee80211_radiotap_header *)skb->data;
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struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
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struct ieee80211_hdr *hdr;
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struct ieee80211_sub_if_data *tmp_sdata, *sdata;
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u16 len_rthdr;
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u8 *payload;
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int hdrlen;
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/*
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* Frame injection is not allowed if beaconing is not allowed
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@ -1680,30 +1637,63 @@ netdev_tx_t ieee80211_monitor_start_xmit(struct sk_buff *skb,
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skb_set_network_header(skb, len_rthdr);
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skb_set_transport_header(skb, len_rthdr);
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if (skb->len < len_rthdr + 2)
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goto fail;
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hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr);
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hdrlen = ieee80211_hdrlen(hdr->frame_control);
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if (skb->len < len_rthdr + hdrlen)
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goto fail;
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/*
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* Initialize skb->protocol if the injected frame is a data frame
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* carrying a rfc1042 header
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*/
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if (skb->len > len_rthdr + 2) {
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hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr);
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if (ieee80211_is_data(hdr->frame_control) &&
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skb->len >= len_rthdr +
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ieee80211_hdrlen(hdr->frame_control) +
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sizeof(rfc1042_header) + 2) {
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payload = (u8 *)hdr +
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ieee80211_hdrlen(hdr->frame_control);
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skb->len >= len_rthdr + hdrlen + sizeof(rfc1042_header) + 2) {
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u8 *payload = (u8 *)hdr + hdrlen;
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if (compare_ether_addr(payload, rfc1042_header) == 0)
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skb->protocol = cpu_to_be16((payload[6] << 8) |
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payload[7]);
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}
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}
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memset(info, 0, sizeof(*info));
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info->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;
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info->flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
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IEEE80211_TX_CTL_INJECTED |
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IEEE80211_TX_INTFL_HAS_RADIOTAP;
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rcu_read_lock();
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/*
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* We process outgoing injected frames that have a local address
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* we handle as though they are non-injected frames.
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* This code here isn't entirely correct, the local MAC address
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* isn't always enough to find the interface to use; for proper
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* VLAN/WDS support we will need a different mechanism (which
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* likely isn't going to be monitor interfaces).
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*/
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sdata = IEEE80211_DEV_TO_SUB_IF(dev);
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list_for_each_entry_rcu(tmp_sdata, &local->interfaces, list) {
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if (!ieee80211_sdata_running(tmp_sdata))
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continue;
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if (tmp_sdata->vif.type == NL80211_IFTYPE_MONITOR ||
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tmp_sdata->vif.type == NL80211_IFTYPE_AP_VLAN ||
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tmp_sdata->vif.type == NL80211_IFTYPE_WDS)
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continue;
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if (compare_ether_addr(tmp_sdata->vif.addr, hdr->addr2) == 0) {
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sdata = tmp_sdata;
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break;
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}
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}
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/* pass the radiotap header up to xmit */
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ieee80211_xmit(IEEE80211_DEV_TO_SUB_IF(dev), skb);
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ieee80211_xmit(sdata, skb);
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rcu_read_unlock();
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return NETDEV_TX_OK;
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fail:
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