From 1e03998e2b85e0250dd55da5146199a720e214af Mon Sep 17 00:00:00 2001 From: Jo-Philipp Wich Date: Tue, 28 Jun 2016 22:43:22 +0200 Subject: [PATCH] mac80211: fix skb size calculation in 4addr mode (FS#24) The PDU length of incoming LLC frames is set to the total skb payload size in __ieee80211_data_to_8023() of net/wireless/util.c which incorrectly includes the length of the IEEE 802.11 header. The resulting LLC frame header has a too large PDU length, causing the llc_fixup_skb() function of net/llc/llc_input.c to reject the incoming skb, effectively breaking STP. Solve the problem by properly substracting the IEEE 802.11 frame header size from the PDU length, allowing the LLC processor to pick up the incoming control messages. Special thanks to Gerry Rozema for tracking down the regression and proposing a suitable patch. Fixes FS#24. References: https://bugs.lede-project.org/index.php?do=details&task_id=24 Reported-by: Gerry Rozema Signed-off-by: Jo-Philipp Wich --- .../patches/533-mac80211_correct_4addr_skbsize.patch | 11 +++++++++++ 1 file changed, 11 insertions(+) create mode 100644 package/kernel/mac80211/patches/533-mac80211_correct_4addr_skbsize.patch diff --git a/package/kernel/mac80211/patches/533-mac80211_correct_4addr_skbsize.patch b/package/kernel/mac80211/patches/533-mac80211_correct_4addr_skbsize.patch new file mode 100644 index 0000000000..afd8cca0f2 --- /dev/null +++ b/package/kernel/mac80211/patches/533-mac80211_correct_4addr_skbsize.patch @@ -0,0 +1,11 @@ +--- a/net/wireless/util.c ++++ b/net/wireless/util.c +@@ -509,7 +509,7 @@ static int __ieee80211_data_to_8023(stru + * replace EtherType */ + hdrlen += ETH_ALEN + 2; + else +- tmp.h_proto = htons(skb->len); ++ tmp.h_proto = htons(skb->len - hdrlen); + + pskb_pull(skb, hdrlen); +