package/kernel/mac80211/patches/subsys/302-mac80211-allocate-tailroom-for-forwarded-mesh-packet.patch

   1 From: Felix Fietkau <nbd@nbd.name>
   2 Date: Fri, 22 Feb 2019 13:21:15 +0100
   3 Subject: [PATCH] mac80211: allocate tailroom for forwarded mesh packets
   4
   5 Forwarded packets enter the tx path through ieee80211_add_pending_skb,
   6 which skips the ieee80211_skb_resize call.
   7 Fixes WARN_ON in ccmp_encrypt_skb and resulting packet loss.
   8
   9 Cc: stable@vger.kernel.org
  10 Signed-off-by: Felix Fietkau <nbd@nbd.name>
  11 Signed-off-by: Johannes Berg <johannes.berg@intel.com>
  12 ---
  13
  14 --- a/net/mac80211/rx.c
  15 +++ b/net/mac80211/rx.c
  16 @@ -2598,6 +2598,7 @@ ieee80211_rx_h_mesh_fwding(struct ieee80
  17         struct ieee80211_sub_if_data *sdata = rx->sdata;
  18         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
  19         u16 ac, q, hdrlen;
  20 +       int tailroom = 0;
  21
  22         hdr = (struct ieee80211_hdr *) skb->data;
  23         hdrlen = ieee80211_hdrlen(hdr->frame_control);
  24 @@ -2684,8 +2685,12 @@ ieee80211_rx_h_mesh_fwding(struct ieee80
  25         if (!ifmsh->mshcfg.dot11MeshForwarding)
  26                 goto out;
  27
  28 +       if (sdata->crypto_tx_tailroom_needed_cnt)
  29 +               tailroom = IEEE80211_ENCRYPT_TAILROOM;
  30 +
  31         fwd_skb = skb_copy_expand(skb, local->tx_headroom +
  32 -                                      sdata->encrypt_headroom, 0, GFP_ATOMIC);
  33 +                                      sdata->encrypt_headroom,
  34 +                                 tailroom, GFP_ATOMIC);
  35         if (!fwd_skb)
  36                 goto out;
  37