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 <helmut.schaa@xxxxxxxxxxxxxx>
---
Changes since v1:
Use cpu_to_be16 instead of ntohs as done everywhere in mac80211.
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..0499707 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 = cpu_to_be16((payload[6] << 8) |
+ payload[7]);
+ }
+ }
+
memset(info, 0, sizeof(*info));
info->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;
--
1.7.3.4
--
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