target/linux/generic/hack-4.14/641-bridge_port_isolate.patch

   1 From e988390850731aa1697ed09d47b0932fac1af175 Mon Sep 17 00:00:00 2001
   2 From: Felix Fietkau <nbd@nbd.name>
   3 Date: Fri, 7 Jul 2017 17:20:03 +0200
   4 Subject: bridge: port isolate
   5
   6 Isolating individual bridge ports
   7
   8 Signed-off-by: Felix Fietkau <nbd@nbd.name>
   9 ---
  10  include/linux/if_bridge.h | 1 +
  11  net/bridge/br_forward.c   | 5 +++++
  12  net/bridge/br_input.c     | 3 +++
  13  net/bridge/br_sysfs_if.c  | 2 ++
  14  4 files changed, 11 insertions(+)
  15
  16 --- a/include/linux/if_bridge.h
  17 +++ b/include/linux/if_bridge.h
  18 @@ -49,6 +49,7 @@ struct br_ip_list {
  19  #define BR_MULTICAST_TO_UNICAST        BIT(12)
  20  #define BR_VLAN_TUNNEL         BIT(13)
  21  #define BR_BCAST_FLOOD         BIT(14)
  22 +#define BR_ISOLATE_MODE                BIT(15)
  23
  24  #define BR_DEFAULT_AGEING_TIME (300 * HZ)
  25
  26 --- a/net/bridge/br_forward.c
  27 +++ b/net/bridge/br_forward.c
  28 @@ -141,6 +141,9 @@ static int deliver_clone(const struct ne
  29  void br_forward(const struct net_bridge_port *to,
  30                 struct sk_buff *skb, bool local_rcv, bool local_orig)
  31  {
  32 +       if (to->flags & BR_ISOLATE_MODE && !local_orig)
  33 +               to = NULL;
  34 +
  35         if (to && should_deliver(to, skb)) {
  36                 if (local_rcv)
  37                         deliver_clone(to, skb, local_orig);
  38 @@ -183,6 +186,8 @@ void br_flood(struct net_bridge *br, str
  39         struct net_bridge_port *p;
  40
  41         list_for_each_entry_rcu(p, &br->port_list, list) {
  42 +               if (!local_orig && (p->flags & BR_ISOLATE_MODE))
  43 +                       continue;
  44                 /* Do not flood unicast traffic to ports that turn it off, nor
  45                  * other traffic if flood off, except for traffic we originate
  46                  */
  47 --- a/net/bridge/br_input.c
  48 +++ b/net/bridge/br_input.c
  49 @@ -177,6 +177,9 @@ int br_handle_frame_finish(struct net *n
  50         if (IS_ENABLED(CONFIG_INET) && skb->protocol == htons(ETH_P_ARP))
  51                 br_do_proxy_arp(skb, br, vid, p);
  52
  53 +       if (p->flags & BR_ISOLATE_MODE)
  54 +               return br_pass_frame_up(skb);
  55 +
  56         switch (pkt_type) {
  57         case BR_PKT_MULTICAST:
  58                 mdst = br_mdb_get(br, skb, vid);
  59 --- a/net/bridge/br_sysfs_if.c
  60 +++ b/net/bridge/br_sysfs_if.c
  61 @@ -174,6 +174,7 @@ BRPORT_ATTR_FLAG(proxyarp, BR_PROXYARP);
  62  BRPORT_ATTR_FLAG(proxyarp_wifi, BR_PROXYARP_WIFI);
  63  BRPORT_ATTR_FLAG(multicast_flood, BR_MCAST_FLOOD);
  64  BRPORT_ATTR_FLAG(broadcast_flood, BR_BCAST_FLOOD);
  65 +BRPORT_ATTR_FLAG(isolate_mode, BR_ISOLATE_MODE);
  66
  67  #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
  68  static ssize_t show_multicast_router(struct net_bridge_port *p, char *buf)
  69 @@ -223,6 +224,7 @@ static const struct brport_attribute *br
  70         &brport_attr_proxyarp_wifi,
  71         &brport_attr_multicast_flood,
  72         &brport_attr_broadcast_flood,
  73 +       &brport_attr_isolate_mode,
  74         NULL
  75  };
  76