[PATCH 1/2] mac80211: Fill in skb->protocol information for injected frames
From: Helmut Schaa <hidden>
Date: 2011-07-29 17:22:30
Subsystem:
mac80211, the rest · Maintainers:
Johannes Berg, Linus Torvalds
Some drivers (ath9k for example) are using skb->protocol to treat EAPOL frames somehow special (disallow aggregation for example). When running in AP mode hostapd injects the EAPOL frames through a monitor interface and thus skb->protocol isn't set at all. Hence, if the injected frame is a data frame and carries a rfc1042 headaer update the skb->protocol field accordingly. Signed-off-by: Helmut Schaa <redacted> --- net/mac80211/tx.c | 20 ++++++++++++++++++++ 1 files changed, 20 insertions(+), 0 deletions(-)
diff --git a/net/mac80211/tx.c b/net/mac80211/tx.c
index b83de4e..939c3f0 100644
--- a/net/mac80211/tx.c
+++ b/net/mac80211/tx.c@@ -1631,7 +1631,9 @@ netdev_tx_t ieee80211_monitor_start_xmit(struct sk_buff *skb, struct ieee80211_radiotap_header *prthdr = (struct ieee80211_radiotap_header *)skb->data; struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); + struct ieee80211_hdr *hdr; u16 len_rthdr; + u8 *payload; /* * Frame injection is not allowed if beaconing is not allowed
@@ -1682,6 +1684,24 @@ netdev_tx_t ieee80211_monitor_start_xmit(struct sk_buff *skb, skb_set_network_header(skb, len_rthdr); skb_set_transport_header(skb, len_rthdr); + /* + * Initialize skb->protocol if the injected frame is a data frame + * carrying a rfc1042 header + */ + if (skb->len > len_rthdr + 2) { + hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr); + if (ieee80211_is_data(hdr->frame_control) && + skb->len >= len_rthdr + + ieee80211_hdrlen(hdr->frame_control) + + sizeof(rfc1042_header) + 2) { + payload = (u8 *)hdr + + ieee80211_hdrlen(hdr->frame_control); + if (compare_ether_addr(payload, rfc1042_header) == 0) + skb->protocol = ntohs((payload[6] << 8) | + payload[7]); + } + } + memset(info, 0, sizeof(*info)); info->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;
--
1.7.3.4