target/linux/generic/hack-4.9/640-bridge-only-accept-EAP-locally.patch

   1 From: Felix Fietkau <nbd@nbd.name>
   2 Date: Fri, 7 Jul 2017 17:18:54 +0200
   3 Subject: bridge: only accept EAP locally
   4
   5 When bridging, do not forward EAP frames to other ports, only deliver
   6 them locally, regardless of the state.
   7
   8 Signed-off-by: Felix Fietkau <nbd@nbd.name>
   9 [add disable_eap_hack sysfs attribute]
  10 Signed-off-by: Etienne Champetier <champetier.etienne@gmail.com>
  11 ---
  12
  13 --- a/net/bridge/br_input.c
  14 +++ b/net/bridge/br_input.c
  15 @@ -164,11 +164,14 @@ int br_handle_frame_finish(struct net *n
  16                 }
  17         }
  18
  19 +       BR_INPUT_SKB_CB(skb)->brdev = br->dev;
  20 +
  21 +       if (skb->protocol == htons(ETH_P_PAE) && !br->disable_eap_hack)
  22 +               return br_pass_frame_up(skb);
  23 +
  24         if (p->state == BR_STATE_LEARNING)
  25                 goto drop;
  26
  27 -       BR_INPUT_SKB_CB(skb)->brdev = br->dev;
  28 -
  29         if (IS_ENABLED(CONFIG_INET) && skb->protocol == htons(ETH_P_ARP))
  30                 br_do_proxy_arp(skb, br, vid, p);
  31
  32 --- a/net/bridge/br_private.h
  33 +++ b/net/bridge/br_private.h
  34 @@ -295,6 +295,8 @@ struct net_bridge
  35         u16                             group_fwd_mask;
  36         u16                             group_fwd_mask_required;
  37
  38 +       bool                            disable_eap_hack;
  39 +
  40         /* STP */
  41         bridge_id                       designated_root;
  42         bridge_id                       bridge_id;
  43 --- a/net/bridge/br_sysfs_br.c
  44 +++ b/net/bridge/br_sysfs_br.c
  45 @@ -169,6 +169,30 @@ static ssize_t group_fwd_mask_store(stru
  46  }
  47  static DEVICE_ATTR_RW(group_fwd_mask);
  48
  49 +static ssize_t disable_eap_hack_show(struct device *d,
  50 +                                  struct device_attribute *attr,
  51 +                                  char *buf)
  52 +{
  53 +       struct net_bridge *br = to_bridge(d);
  54 +       return sprintf(buf, "%u\n", br->disable_eap_hack);
  55 +}
  56 +
  57 +static int set_disable_eap_hack(struct net_bridge *br, unsigned long val)
  58 +{
  59 +       br->disable_eap_hack = !!val;
  60 +
  61 +       return 0;
  62 +}
  63 +
  64 +static ssize_t disable_eap_hack_store(struct device *d,
  65 +                                   struct device_attribute *attr,
  66 +                                   const char *buf,
  67 +                                   size_t len)
  68 +{
  69 +       return store_bridge_parm(d, buf, len, set_disable_eap_hack);
  70 +}
  71 +static DEVICE_ATTR_RW(disable_eap_hack);
  72 +
  73  static ssize_t priority_show(struct device *d, struct device_attribute *attr,
  74                              char *buf)
  75  {
  76 @@ -780,6 +804,7 @@ static struct attribute *bridge_attrs[]
  77         &dev_attr_ageing_time.attr,
  78         &dev_attr_stp_state.attr,
  79         &dev_attr_group_fwd_mask.attr,
  80 +       &dev_attr_disable_eap_hack.attr,
  81         &dev_attr_priority.attr,
  82         &dev_attr_bridge_id.attr,
  83         &dev_attr_root_id.attr,