target/linux/generic/patches-4.9/641-bridge_port_isolate.patch

   1 From: Felix Fietkau <nbd@nbd.name>
   2 Subject: [PATCH] bridge: port isolate
   3
   4 Isolating individual bridge ports
   5 ---
   6 --- a/include/linux/if_bridge.h
   7 +++ b/include/linux/if_bridge.h
   8 @@ -47,6 +47,7 @@ struct br_ip_list {
   9  #define BR_PROXYARP_WIFI       BIT(10)
  10  #define BR_MCAST_FLOOD         BIT(11)
  11  #define BR_MULTICAST_TO_UNICAST        BIT(12)
  12 +#define BR_ISOLATE_MODE                BIT(13)
  13
  14  #define BR_DEFAULT_AGEING_TIME (300 * HZ)
  15
  16 --- a/net/bridge/br_sysfs_if.c
  17 +++ b/net/bridge/br_sysfs_if.c
  18 @@ -172,6 +172,7 @@ BRPORT_ATTR_FLAG(unicast_flood, BR_FLOOD
  19  BRPORT_ATTR_FLAG(proxyarp, BR_PROXYARP);
  20  BRPORT_ATTR_FLAG(proxyarp_wifi, BR_PROXYARP_WIFI);
  21  BRPORT_ATTR_FLAG(multicast_flood, BR_MCAST_FLOOD);
  22 +BRPORT_ATTR_FLAG(isolate_mode, BR_ISOLATE_MODE);
  23
  24  #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
  25  static ssize_t show_multicast_router(struct net_bridge_port *p, char *buf)
  26 @@ -220,6 +221,7 @@ static const struct brport_attribute *br
  27         &brport_attr_proxyarp,
  28         &brport_attr_proxyarp_wifi,
  29         &brport_attr_multicast_flood,
  30 +       &brport_attr_isolate_mode,
  31         NULL
  32  };
  33
  34 --- a/net/bridge/br_forward.c
  35 +++ b/net/bridge/br_forward.c
  36 @@ -141,6 +141,9 @@ static int deliver_clone(const struct ne
  37  void br_forward(const struct net_bridge_port *to,
  38                 struct sk_buff *skb, bool local_rcv, bool local_orig)
  39  {
  40 +       if (to->flags & BR_ISOLATE_MODE)
  41 +               to = NULL;
  42 +
  43         if (to && should_deliver(to, skb)) {
  44                 if (local_rcv)
  45                         deliver_clone(to, skb, local_orig);
  46 @@ -206,6 +209,8 @@ void br_flood(struct net_bridge *br, str
  47         struct net_bridge_port *p;
  48
  49         list_for_each_entry_rcu(p, &br->port_list, list) {
  50 +               if (!local_orig && (p->flags & BR_ISOLATE_MODE))
  51 +                       continue;
  52                 /* Do not flood unicast traffic to ports that turn it off */
  53                 if (pkt_type == BR_PKT_UNICAST && !(p->flags & BR_FLOOD))
  54                         continue;
  55 --- a/net/bridge/br_input.c
  56 +++ b/net/bridge/br_input.c
  57 @@ -174,6 +174,9 @@ int br_handle_frame_finish(struct net *n
  58         if (IS_ENABLED(CONFIG_INET) && skb->protocol == htons(ETH_P_ARP))
  59                 br_do_proxy_arp(skb, br, vid, p);
  60
  61 +       if (p->flags & BR_ISOLATE_MODE)
  62 +               return br_pass_frame_up(skb);
  63 +
  64         switch (pkt_type) {
  65         case BR_PKT_MULTICAST:
  66                 mdst = br_mdb_get(br, skb, vid);