package/kernel/mac80211/patches/subsys/313-wifi-cfg80211-factor-out-bridge-tunnel-RFC1042-heade.patch

   1 From: Felix Fietkau <nbd@nbd.name>
   2 Date: Fri, 2 Dec 2022 13:54:15 +0100
   3 Subject: [PATCH] wifi: cfg80211: factor out bridge tunnel / RFC1042 header
   4  check
   5
   6 The same check is done in multiple places, unify it.
   7
   8 Signed-off-by: Felix Fietkau <nbd@nbd.name>
   9 ---
  10
  11 --- a/net/wireless/util.c
  12 +++ b/net/wireless/util.c
  13 @@ -542,6 +542,21 @@ unsigned int ieee80211_get_mesh_hdrlen(s
  14  }
  15  EXPORT_SYMBOL(ieee80211_get_mesh_hdrlen);
  16
  17 +static bool ieee80211_get_8023_tunnel_proto(const void *hdr, __be16 *proto)
  18 +{
  19 +       const __be16 *hdr_proto = hdr + ETH_ALEN;
  20 +
  21 +       if (!(ether_addr_equal(hdr, rfc1042_header) &&
  22 +             *hdr_proto != htons(ETH_P_AARP) &&
  23 +             *hdr_proto != htons(ETH_P_IPX)) &&
  24 +           !ether_addr_equal(hdr, bridge_tunnel_header))
  25 +               return false;
  26 +
  27 +       *proto = *hdr_proto;
  28 +
  29 +       return true;
  30 +}
  31 +
  32  int ieee80211_data_to_8023_exthdr(struct sk_buff *skb, struct ethhdr *ehdr,
  33                                   const u8 *addr, enum nl80211_iftype iftype,
  34                                   u8 data_offset, bool is_amsdu)
  35 @@ -633,14 +648,9 @@ int ieee80211_data_to_8023_exthdr(struct
  36
  37         if (likely(!is_amsdu &&
  38                    skb_copy_bits(skb, hdrlen, &payload, sizeof(payload)) == 0 &&
  39 -                  ((ether_addr_equal(payload.hdr, rfc1042_header) &&
  40 -                    payload.proto != htons(ETH_P_AARP) &&
  41 -                    payload.proto != htons(ETH_P_IPX)) ||
  42 -                   ether_addr_equal(payload.hdr, bridge_tunnel_header)))) {
  43 -               /* remove RFC1042 or Bridge-Tunnel encapsulation and
  44 -                * replace EtherType */
  45 +                  ieee80211_get_8023_tunnel_proto(&payload, &tmp.h_proto))) {
  46 +               /* remove RFC1042 or Bridge-Tunnel encapsulation */
  47                 hdrlen += ETH_ALEN + 2;
  48 -               tmp.h_proto = payload.proto;
  49                 skb_postpull_rcsum(skb, &payload, ETH_ALEN + 2);
  50         } else {
  51                 tmp.h_proto = htons(skb->len - hdrlen);
  52 @@ -756,8 +766,6 @@ void ieee80211_amsdu_to_8023s(struct sk_
  53  {
  54         unsigned int hlen = ALIGN(extra_headroom, 4);
  55         struct sk_buff *frame = NULL;
  56 -       u16 ethertype;
  57 -       u8 *payload;
  58         int offset = 0, remaining;
  59         struct ethhdr eth;
  60         bool reuse_frag = skb->head_frag && !skb_has_frag_list(skb);
  61 @@ -811,14 +819,8 @@ void ieee80211_amsdu_to_8023s(struct sk_
  62                 frame->dev = skb->dev;
  63                 frame->priority = skb->priority;
  64
  65 -               payload = frame->data;
  66 -               ethertype = (payload[6] << 8) | payload[7];
  67 -               if (likely((ether_addr_equal(payload, rfc1042_header) &&
  68 -                           ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) ||
  69 -                          ether_addr_equal(payload, bridge_tunnel_header))) {
  70 -                       eth.h_proto = htons(ethertype);
  71 +               if (likely(ieee80211_get_8023_tunnel_proto(frame->data, &eth.h_proto)))
  72                         skb_pull(frame, ETH_ALEN + 2);
  73 -               }
  74
  75                 memcpy(skb_push(frame, sizeof(eth)), &eth, sizeof(eth));
  76                 __skb_queue_tail(list, frame);