target/linux/generic/pending-3.18/642-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/net/bridge/br_private.h
   7 +++ b/net/bridge/br_private.h
   8 @@ -172,6 +172,7 @@ struct net_bridge_port
   9  #define BR_FLOOD               0x00000040
  10  #define BR_AUTO_MASK (BR_FLOOD | BR_LEARNING)
  11  #define BR_PROMISC             0x00000080
  12 +#define BR_ISOLATE_MODE                0x00000100
  13
  14  #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
  15         struct bridge_mcast_own_query   ip4_own_query;
  16 --- a/net/bridge/br_sysfs_if.c
  17 +++ b/net/bridge/br_sysfs_if.c
  18 @@ -170,6 +170,7 @@ BRPORT_ATTR_FLAG(bpdu_guard, BR_BPDU_GUA
  19  BRPORT_ATTR_FLAG(root_block, BR_ROOT_BLOCK);
  20  BRPORT_ATTR_FLAG(learning, BR_LEARNING);
  21  BRPORT_ATTR_FLAG(unicast_flood, BR_FLOOD);
  22 +BRPORT_ATTR_FLAG(isolated, 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 @@ -213,6 +214,7 @@ static const struct brport_attribute *br
  27         &brport_attr_multicast_router,
  28         &brport_attr_multicast_fast_leave,
  29  #endif
  30 +       &brport_attr_isolated,
  31         NULL
  32  };
  33
  34 --- a/net/bridge/br_input.c
  35 +++ b/net/bridge/br_input.c
  36 @@ -120,8 +120,8 @@ int br_handle_frame_finish(struct sk_buf
  37
  38                 unicast = false;
  39                 br->dev->stats.multicast++;
  40 -       } else if ((dst = __br_fdb_get(br, dest, vid)) &&
  41 -                       dst->is_local) {
  42 +       } else if ((p->flags & BR_ISOLATE_MODE) ||
  43 +                  ((dst = __br_fdb_get(br, dest, vid)) && dst->is_local)) {
  44                 skb2 = skb;
  45                 /* Do not forward the packet since it's local. */
  46                 skb = NULL;
  47 --- a/net/bridge/br_forward.c
  48 +++ b/net/bridge/br_forward.c
  49 @@ -117,7 +117,7 @@ EXPORT_SYMBOL_GPL(br_deliver);
  50  /* called with rcu_read_lock */
  51  void br_forward(const struct net_bridge_port *to, struct sk_buff *skb, struct sk_buff *skb0)
  52  {
  53 -       if (should_deliver(to, skb)) {
  54 +       if (should_deliver(to, skb) && !(to->flags & BR_ISOLATE_MODE)) {
  55                 if (skb0)
  56                         deliver_clone(to, skb, __br_forward);
  57                 else
  58 @@ -173,7 +173,7 @@ static void br_flood(struct net_bridge *
  59                      struct sk_buff *skb0,
  60                      void (*__packet_hook)(const struct net_bridge_port *p,
  61                                            struct sk_buff *skb),
  62 -                    bool unicast)
  63 +                                               bool unicast, bool forward)
  64  {
  65         struct net_bridge_port *p;
  66         struct net_bridge_port *prev;
  67 @@ -181,6 +181,8 @@ static void br_flood(struct net_bridge *
  68         prev = NULL;
  69
  70         list_for_each_entry_rcu(p, &br->port_list, list) {
  71 +               if (forward && (p->flags & BR_ISOLATE_MODE))
  72 +                       continue;
  73                 /* Do not flood unicast traffic to ports that turn it off */
  74                 if (unicast && !(p->flags & BR_FLOOD))
  75                         continue;
  76 @@ -207,14 +209,14 @@ out:
  77  /* called with rcu_read_lock */
  78  void br_flood_deliver(struct net_bridge *br, struct sk_buff *skb, bool unicast)
  79  {
  80 -       br_flood(br, skb, NULL, __br_deliver, unicast);
  81 +       br_flood(br, skb, NULL, __br_deliver, unicast, false);
  82  }
  83
  84  /* called under bridge lock */
  85  void br_flood_forward(struct net_bridge *br, struct sk_buff *skb,
  86                       struct sk_buff *skb2, bool unicast)
  87  {
  88 -       br_flood(br, skb, skb2, __br_forward, unicast);
  89 +       br_flood(br, skb, skb2, __br_forward, unicast, true);
  90  }
  91
  92  #ifdef CONFIG_BRIDGE_IGMP_SNOOPING