target/linux/generic/hack-4.19/640-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 @@ -108,10 +108,14 @@ 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         BR_INPUT_SKB_CB(skb)->src_port_isolated = !!(p->flags & BR_ISOLATED);
  29
  30         if (IS_ENABLED(CONFIG_INET) &&
  31 --- a/net/bridge/br_private.h
  32 +++ b/net/bridge/br_private.h
  33 @@ -337,6 +337,8 @@ struct net_bridge {
  34         u16                             group_fwd_mask;
  35         u16                             group_fwd_mask_required;
  36
  37 +       bool                            disable_eap_hack;
  38 +
  39         /* STP */
  40         bridge_id                       designated_root;
  41         bridge_id                       bridge_id;
  42 --- a/net/bridge/br_sysfs_br.c
  43 +++ b/net/bridge/br_sysfs_br.c
  44 @@ -170,6 +170,30 @@ static ssize_t group_fwd_mask_store(stru
  45  }
  46  static DEVICE_ATTR_RW(group_fwd_mask);
  47
  48 +static ssize_t disable_eap_hack_show(struct device *d,
  49 +                                  struct device_attribute *attr,
  50 +                                  char *buf)
  51 +{
  52 +       struct net_bridge *br = to_bridge(d);
  53 +       return sprintf(buf, "%u\n", br->disable_eap_hack);
  54 +}
  55 +
  56 +static int set_disable_eap_hack(struct net_bridge *br, unsigned long val)
  57 +{
  58 +       br->disable_eap_hack = !!val;
  59 +
  60 +       return 0;
  61 +}
  62 +
  63 +static ssize_t disable_eap_hack_store(struct device *d,
  64 +                                   struct device_attribute *attr,
  65 +                                   const char *buf,
  66 +                                   size_t len)
  67 +{
  68 +       return store_bridge_parm(d, buf, len, set_disable_eap_hack);
  69 +}
  70 +static DEVICE_ATTR_RW(disable_eap_hack);
  71 +
  72  static ssize_t priority_show(struct device *d, struct device_attribute *attr,
  73                              char *buf)
  74  {
  75 @@ -810,6 +834,7 @@ static struct attribute *bridge_attrs[]
  76         &dev_attr_ageing_time.attr,
  77         &dev_attr_stp_state.attr,
  78         &dev_attr_group_fwd_mask.attr,
  79 +       &dev_attr_disable_eap_hack.attr,
  80         &dev_attr_priority.attr,
  81         &dev_attr_bridge_id.attr,
  82         &dev_attr_root_id.attr,