525 lines
15 KiB
C
525 lines
15 KiB
C
void hostap_dump_tx_80211(const char *name, struct sk_buff *skb)
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{
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struct ieee80211_hdr *hdr;
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u16 fc;
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hdr = (struct ieee80211_hdr *) skb->data;
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printk(KERN_DEBUG "%s: TX len=%d jiffies=%ld\n",
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name, skb->len, jiffies);
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if (skb->len < 2)
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return;
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fc = le16_to_cpu(hdr->frame_ctl);
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printk(KERN_DEBUG " FC=0x%04x (type=%d:%d)%s%s",
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fc, HOSTAP_FC_GET_TYPE(fc), HOSTAP_FC_GET_STYPE(fc),
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fc & WLAN_FC_TODS ? " [ToDS]" : "",
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fc & WLAN_FC_FROMDS ? " [FromDS]" : "");
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if (skb->len < IEEE80211_DATA_HDR3_LEN) {
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printk("\n");
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return;
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}
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printk(" dur=0x%04x seq=0x%04x\n", le16_to_cpu(hdr->duration_id),
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le16_to_cpu(hdr->seq_ctl));
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printk(KERN_DEBUG " A1=" MACSTR " A2=" MACSTR " A3=" MACSTR,
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MAC2STR(hdr->addr1), MAC2STR(hdr->addr2), MAC2STR(hdr->addr3));
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if (skb->len >= 30)
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printk(" A4=" MACSTR, MAC2STR(hdr->addr4));
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printk("\n");
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}
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/* hard_start_xmit function for data interfaces (wlan#, wlan#wds#, wlan#sta)
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* Convert Ethernet header into a suitable IEEE 802.11 header depending on
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* device configuration. */
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int hostap_data_start_xmit(struct sk_buff *skb, struct net_device *dev)
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{
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struct hostap_interface *iface;
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local_info_t *local;
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int need_headroom, need_tailroom = 0;
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struct ieee80211_hdr hdr;
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u16 fc, ethertype = 0;
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enum {
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WDS_NO = 0, WDS_OWN_FRAME, WDS_COMPLIANT_FRAME
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} use_wds = WDS_NO;
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u8 *encaps_data;
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int hdr_len, encaps_len, skip_header_bytes;
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int to_assoc_ap = 0;
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struct hostap_skb_tx_data *meta;
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iface = netdev_priv(dev);
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local = iface->local;
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if (skb->len < ETH_HLEN) {
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printk(KERN_DEBUG "%s: hostap_data_start_xmit: short skb "
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"(len=%d)\n", dev->name, skb->len);
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kfree_skb(skb);
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return 0;
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}
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if (local->ddev != dev) {
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use_wds = (local->iw_mode == IW_MODE_MASTER &&
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!(local->wds_type & HOSTAP_WDS_STANDARD_FRAME)) ?
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WDS_OWN_FRAME : WDS_COMPLIANT_FRAME;
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if (dev == local->stadev) {
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to_assoc_ap = 1;
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use_wds = WDS_NO;
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} else if (dev == local->apdev) {
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printk(KERN_DEBUG "%s: prism2_tx: trying to use "
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"AP device with Ethernet net dev\n", dev->name);
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kfree_skb(skb);
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return 0;
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}
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} else {
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if (local->iw_mode == IW_MODE_REPEAT) {
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printk(KERN_DEBUG "%s: prism2_tx: trying to use "
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"non-WDS link in Repeater mode\n", dev->name);
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kfree_skb(skb);
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return 0;
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} else if (local->iw_mode == IW_MODE_INFRA &&
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(local->wds_type & HOSTAP_WDS_AP_CLIENT) &&
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memcmp(skb->data + ETH_ALEN, dev->dev_addr,
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ETH_ALEN) != 0) {
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/* AP client mode: send frames with foreign src addr
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* using 4-addr WDS frames */
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use_wds = WDS_COMPLIANT_FRAME;
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}
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}
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/* Incoming skb->data: dst_addr[6], src_addr[6], proto[2], payload
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* ==>
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* Prism2 TX frame with 802.11 header:
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* txdesc (address order depending on used mode; includes dst_addr and
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* src_addr), possible encapsulation (RFC1042/Bridge-Tunnel;
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* proto[2], payload {, possible addr4[6]} */
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ethertype = (skb->data[12] << 8) | skb->data[13];
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memset(&hdr, 0, sizeof(hdr));
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/* Length of data after IEEE 802.11 header */
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encaps_data = NULL;
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encaps_len = 0;
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skip_header_bytes = ETH_HLEN;
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if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) {
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encaps_data = bridge_tunnel_header;
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encaps_len = sizeof(bridge_tunnel_header);
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skip_header_bytes -= 2;
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} else if (ethertype >= 0x600) {
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encaps_data = rfc1042_header;
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encaps_len = sizeof(rfc1042_header);
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skip_header_bytes -= 2;
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}
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fc = (WLAN_FC_TYPE_DATA << 2) | (WLAN_FC_STYPE_DATA << 4);
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hdr_len = IEEE80211_DATA_HDR3_LEN;
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if (use_wds != WDS_NO) {
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/* Note! Prism2 station firmware has problems with sending real
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* 802.11 frames with four addresses; until these problems can
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* be fixed or worked around, 4-addr frames needed for WDS are
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* using incompatible format: FromDS flag is not set and the
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* fourth address is added after the frame payload; it is
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* assumed, that the receiving station knows how to handle this
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* frame format */
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if (use_wds == WDS_COMPLIANT_FRAME) {
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fc |= WLAN_FC_FROMDS | WLAN_FC_TODS;
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/* From&To DS: Addr1 = RA, Addr2 = TA, Addr3 = DA,
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* Addr4 = SA */
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memcpy(&hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
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hdr_len += ETH_ALEN;
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} else {
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/* bogus 4-addr format to workaround Prism2 station
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* f/w bug */
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fc |= WLAN_FC_TODS;
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/* From DS: Addr1 = DA (used as RA),
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* Addr2 = BSSID (used as TA), Addr3 = SA (used as DA),
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*/
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/* SA from skb->data + ETH_ALEN will be added after
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* frame payload; use hdr.addr4 as a temporary buffer
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*/
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memcpy(&hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
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need_tailroom += ETH_ALEN;
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}
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/* send broadcast and multicast frames to broadcast RA, if
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* configured; otherwise, use unicast RA of the WDS link */
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if ((local->wds_type & HOSTAP_WDS_BROADCAST_RA) &&
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skb->data[0] & 0x01)
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memset(&hdr.addr1, 0xff, ETH_ALEN);
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else if (iface->type == HOSTAP_INTERFACE_WDS)
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memcpy(&hdr.addr1, iface->u.wds.remote_addr,
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ETH_ALEN);
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else
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memcpy(&hdr.addr1, local->bssid, ETH_ALEN);
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memcpy(&hdr.addr2, dev->dev_addr, ETH_ALEN);
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memcpy(&hdr.addr3, skb->data, ETH_ALEN);
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} else if (local->iw_mode == IW_MODE_MASTER && !to_assoc_ap) {
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fc |= WLAN_FC_FROMDS;
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/* From DS: Addr1 = DA, Addr2 = BSSID, Addr3 = SA */
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memcpy(&hdr.addr1, skb->data, ETH_ALEN);
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memcpy(&hdr.addr2, dev->dev_addr, ETH_ALEN);
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memcpy(&hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN);
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} else if (local->iw_mode == IW_MODE_INFRA || to_assoc_ap) {
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fc |= WLAN_FC_TODS;
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/* To DS: Addr1 = BSSID, Addr2 = SA, Addr3 = DA */
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memcpy(&hdr.addr1, to_assoc_ap ?
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local->assoc_ap_addr : local->bssid, ETH_ALEN);
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memcpy(&hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
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memcpy(&hdr.addr3, skb->data, ETH_ALEN);
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} else if (local->iw_mode == IW_MODE_ADHOC) {
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/* not From/To DS: Addr1 = DA, Addr2 = SA, Addr3 = BSSID */
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memcpy(&hdr.addr1, skb->data, ETH_ALEN);
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memcpy(&hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
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memcpy(&hdr.addr3, local->bssid, ETH_ALEN);
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}
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hdr.frame_ctl = cpu_to_le16(fc);
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skb_pull(skb, skip_header_bytes);
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need_headroom = local->func->need_tx_headroom + hdr_len + encaps_len;
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if (skb_tailroom(skb) < need_tailroom) {
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skb = skb_unshare(skb, GFP_ATOMIC);
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if (skb == NULL) {
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iface->stats.tx_dropped++;
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return 0;
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}
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if (pskb_expand_head(skb, need_headroom, need_tailroom,
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GFP_ATOMIC)) {
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kfree_skb(skb);
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iface->stats.tx_dropped++;
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return 0;
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}
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} else if (skb_headroom(skb) < need_headroom) {
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struct sk_buff *tmp = skb;
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skb = skb_realloc_headroom(skb, need_headroom);
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kfree_skb(tmp);
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if (skb == NULL) {
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iface->stats.tx_dropped++;
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return 0;
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}
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} else {
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skb = skb_unshare(skb, GFP_ATOMIC);
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if (skb == NULL) {
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iface->stats.tx_dropped++;
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return 0;
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}
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}
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if (encaps_data)
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memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len);
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memcpy(skb_push(skb, hdr_len), &hdr, hdr_len);
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if (use_wds == WDS_OWN_FRAME) {
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memcpy(skb_put(skb, ETH_ALEN), &hdr.addr4, ETH_ALEN);
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}
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iface->stats.tx_packets++;
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iface->stats.tx_bytes += skb->len;
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skb->mac.raw = skb->data;
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meta = (struct hostap_skb_tx_data *) skb->cb;
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memset(meta, 0, sizeof(*meta));
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meta->magic = HOSTAP_SKB_TX_DATA_MAGIC;
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if (use_wds)
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meta->flags |= HOSTAP_TX_FLAGS_WDS;
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meta->ethertype = ethertype;
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meta->iface = iface;
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/* Send IEEE 802.11 encapsulated frame using the master radio device */
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skb->dev = local->dev;
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dev_queue_xmit(skb);
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return 0;
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}
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/* hard_start_xmit function for hostapd wlan#ap interfaces */
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int hostap_mgmt_start_xmit(struct sk_buff *skb, struct net_device *dev)
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{
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struct hostap_interface *iface;
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local_info_t *local;
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struct hostap_skb_tx_data *meta;
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struct ieee80211_hdr *hdr;
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u16 fc;
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iface = netdev_priv(dev);
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local = iface->local;
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if (skb->len < 10) {
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printk(KERN_DEBUG "%s: hostap_mgmt_start_xmit: short skb "
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"(len=%d)\n", dev->name, skb->len);
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kfree_skb(skb);
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return 0;
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}
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iface->stats.tx_packets++;
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iface->stats.tx_bytes += skb->len;
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meta = (struct hostap_skb_tx_data *) skb->cb;
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memset(meta, 0, sizeof(*meta));
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meta->magic = HOSTAP_SKB_TX_DATA_MAGIC;
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meta->iface = iface;
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if (skb->len >= IEEE80211_DATA_HDR3_LEN + sizeof(rfc1042_header) + 2) {
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hdr = (struct ieee80211_hdr *) skb->data;
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fc = le16_to_cpu(hdr->frame_ctl);
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if (HOSTAP_FC_GET_TYPE(fc) == WLAN_FC_TYPE_DATA &&
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HOSTAP_FC_GET_STYPE(fc) == WLAN_FC_STYPE_DATA) {
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u8 *pos = &skb->data[IEEE80211_DATA_HDR3_LEN +
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sizeof(rfc1042_header)];
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meta->ethertype = (pos[0] << 8) | pos[1];
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}
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}
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/* Send IEEE 802.11 encapsulated frame using the master radio device */
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skb->dev = local->dev;
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dev_queue_xmit(skb);
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return 0;
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}
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/* Called only from software IRQ */
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struct sk_buff * hostap_tx_encrypt(struct sk_buff *skb,
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struct ieee80211_crypt_data *crypt)
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{
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struct hostap_interface *iface;
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local_info_t *local;
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struct ieee80211_hdr *hdr;
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u16 fc;
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int hdr_len, res;
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iface = netdev_priv(skb->dev);
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local = iface->local;
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if (skb->len < IEEE80211_DATA_HDR3_LEN) {
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kfree_skb(skb);
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return NULL;
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}
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if (local->tkip_countermeasures &&
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crypt && crypt->ops && strcmp(crypt->ops->name, "TKIP") == 0) {
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hdr = (struct ieee80211_hdr *) skb->data;
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if (net_ratelimit()) {
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printk(KERN_DEBUG "%s: TKIP countermeasures: dropped "
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"TX packet to " MACSTR "\n",
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local->dev->name, MAC2STR(hdr->addr1));
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}
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kfree_skb(skb);
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return NULL;
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}
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skb = skb_unshare(skb, GFP_ATOMIC);
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if (skb == NULL)
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return NULL;
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if ((skb_headroom(skb) < crypt->ops->extra_prefix_len ||
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skb_tailroom(skb) < crypt->ops->extra_postfix_len) &&
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pskb_expand_head(skb, crypt->ops->extra_prefix_len,
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crypt->ops->extra_postfix_len, GFP_ATOMIC)) {
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kfree_skb(skb);
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return NULL;
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}
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hdr = (struct ieee80211_hdr *) skb->data;
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fc = le16_to_cpu(hdr->frame_ctl);
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hdr_len = hostap_80211_get_hdrlen(fc);
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/* Host-based IEEE 802.11 fragmentation for TX is not yet supported, so
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* call both MSDU and MPDU encryption functions from here. */
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atomic_inc(&crypt->refcnt);
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res = 0;
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if (crypt->ops->encrypt_msdu)
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res = crypt->ops->encrypt_msdu(skb, hdr_len, crypt->priv);
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if (res == 0 && crypt->ops->encrypt_mpdu)
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res = crypt->ops->encrypt_mpdu(skb, hdr_len, crypt->priv);
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atomic_dec(&crypt->refcnt);
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if (res < 0) {
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kfree_skb(skb);
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return NULL;
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}
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return skb;
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}
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/* hard_start_xmit function for master radio interface wifi#.
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* AP processing (TX rate control, power save buffering, etc.).
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* Use hardware TX function to send the frame. */
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int hostap_master_start_xmit(struct sk_buff *skb, struct net_device *dev)
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{
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struct hostap_interface *iface;
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local_info_t *local;
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int ret = 1;
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u16 fc;
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struct hostap_tx_data tx;
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ap_tx_ret tx_ret;
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struct hostap_skb_tx_data *meta;
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int no_encrypt = 0;
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struct ieee80211_hdr *hdr;
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iface = netdev_priv(dev);
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local = iface->local;
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tx.skb = skb;
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tx.sta_ptr = NULL;
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meta = (struct hostap_skb_tx_data *) skb->cb;
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if (meta->magic != HOSTAP_SKB_TX_DATA_MAGIC) {
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printk(KERN_DEBUG "%s: invalid skb->cb magic (0x%08x, "
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"expected 0x%08x)\n",
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dev->name, meta->magic, HOSTAP_SKB_TX_DATA_MAGIC);
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ret = 0;
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iface->stats.tx_dropped++;
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goto fail;
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}
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if (local->host_encrypt) {
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/* Set crypt to default algorithm and key; will be replaced in
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* AP code if STA has own alg/key */
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tx.crypt = local->crypt[local->tx_keyidx];
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tx.host_encrypt = 1;
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} else {
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tx.crypt = NULL;
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tx.host_encrypt = 0;
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}
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if (skb->len < 24) {
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printk(KERN_DEBUG "%s: hostap_master_start_xmit: short skb "
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"(len=%d)\n", dev->name, skb->len);
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ret = 0;
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iface->stats.tx_dropped++;
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goto fail;
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}
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/* FIX (?):
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* Wi-Fi 802.11b test plan suggests that AP should ignore power save
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* bit in authentication and (re)association frames and assume tha
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* STA remains awake for the response. */
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tx_ret = hostap_handle_sta_tx(local, &tx);
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skb = tx.skb;
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meta = (struct hostap_skb_tx_data *) skb->cb;
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hdr = (struct ieee80211_hdr *) skb->data;
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fc = le16_to_cpu(hdr->frame_ctl);
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switch (tx_ret) {
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case AP_TX_CONTINUE:
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break;
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case AP_TX_CONTINUE_NOT_AUTHORIZED:
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if (local->ieee_802_1x &&
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HOSTAP_FC_GET_TYPE(fc) == WLAN_FC_TYPE_DATA &&
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meta->ethertype != ETH_P_PAE &&
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!(meta->flags & HOSTAP_TX_FLAGS_WDS)) {
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printk(KERN_DEBUG "%s: dropped frame to unauthorized "
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"port (IEEE 802.1X): ethertype=0x%04x\n",
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dev->name, meta->ethertype);
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hostap_dump_tx_80211(dev->name, skb);
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ret = 0; /* drop packet */
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iface->stats.tx_dropped++;
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goto fail;
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}
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break;
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case AP_TX_DROP:
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ret = 0; /* drop packet */
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iface->stats.tx_dropped++;
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goto fail;
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case AP_TX_RETRY:
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goto fail;
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case AP_TX_BUFFERED:
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/* do not free skb here, it will be freed when the
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* buffered frame is sent/timed out */
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ret = 0;
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goto tx_exit;
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}
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/* Request TX callback if protocol version is 2 in 802.11 header;
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* this version 2 is a special case used between hostapd and kernel
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* driver */
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if (((fc & WLAN_FC_PVER) == BIT(1)) &&
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local->ap && local->ap->tx_callback_idx && meta->tx_cb_idx == 0) {
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meta->tx_cb_idx = local->ap->tx_callback_idx;
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/* remove special version from the frame header */
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fc &= ~WLAN_FC_PVER;
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hdr->frame_ctl = cpu_to_le16(fc);
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}
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if (HOSTAP_FC_GET_TYPE(fc) != WLAN_FC_TYPE_DATA) {
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no_encrypt = 1;
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tx.crypt = NULL;
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}
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if (local->ieee_802_1x && meta->ethertype == ETH_P_PAE && tx.crypt &&
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!(fc & WLAN_FC_ISWEP)) {
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|
no_encrypt = 1;
|
|
PDEBUG(DEBUG_EXTRA2, "%s: TX: IEEE 802.1X - passing "
|
|
"unencrypted EAPOL frame\n", dev->name);
|
|
tx.crypt = NULL; /* no encryption for IEEE 802.1X frames */
|
|
}
|
|
|
|
if (tx.crypt && (!tx.crypt->ops || !tx.crypt->ops->encrypt_mpdu))
|
|
tx.crypt = NULL;
|
|
else if ((tx.crypt || local->crypt[local->tx_keyidx]) && !no_encrypt) {
|
|
/* Add ISWEP flag both for firmware and host based encryption
|
|
*/
|
|
fc |= WLAN_FC_ISWEP;
|
|
hdr->frame_ctl = cpu_to_le16(fc);
|
|
} else if (local->drop_unencrypted &&
|
|
HOSTAP_FC_GET_TYPE(fc) == WLAN_FC_TYPE_DATA &&
|
|
meta->ethertype != ETH_P_PAE) {
|
|
if (net_ratelimit()) {
|
|
printk(KERN_DEBUG "%s: dropped unencrypted TX data "
|
|
"frame (drop_unencrypted=1)\n", dev->name);
|
|
}
|
|
iface->stats.tx_dropped++;
|
|
ret = 0;
|
|
goto fail;
|
|
}
|
|
|
|
if (tx.crypt) {
|
|
skb = hostap_tx_encrypt(skb, tx.crypt);
|
|
if (skb == NULL) {
|
|
printk(KERN_DEBUG "%s: TX - encryption failed\n",
|
|
dev->name);
|
|
ret = 0;
|
|
goto fail;
|
|
}
|
|
meta = (struct hostap_skb_tx_data *) skb->cb;
|
|
if (meta->magic != HOSTAP_SKB_TX_DATA_MAGIC) {
|
|
printk(KERN_DEBUG "%s: invalid skb->cb magic (0x%08x, "
|
|
"expected 0x%08x) after hostap_tx_encrypt\n",
|
|
dev->name, meta->magic,
|
|
HOSTAP_SKB_TX_DATA_MAGIC);
|
|
ret = 0;
|
|
iface->stats.tx_dropped++;
|
|
goto fail;
|
|
}
|
|
}
|
|
|
|
if (local->func->tx == NULL || local->func->tx(skb, dev)) {
|
|
ret = 0;
|
|
iface->stats.tx_dropped++;
|
|
} else {
|
|
ret = 0;
|
|
iface->stats.tx_packets++;
|
|
iface->stats.tx_bytes += skb->len;
|
|
}
|
|
|
|
fail:
|
|
if (!ret && skb)
|
|
dev_kfree_skb(skb);
|
|
tx_exit:
|
|
if (tx.sta_ptr)
|
|
hostap_handle_sta_release(tx.sta_ptr);
|
|
return ret;
|
|
}
|
|
|
|
|
|
EXPORT_SYMBOL(hostap_dump_tx_80211);
|
|
EXPORT_SYMBOL(hostap_tx_encrypt);
|
|
EXPORT_SYMBOL(hostap_master_start_xmit);
|