target/linux/generic/patches-3.18/644-bridge_optimize_netfilter_hooks.patch

   1 --- a/net/bridge/br_forward.c
   2 +++ b/net/bridge/br_forward.c
   3 @@ -53,7 +53,7 @@ EXPORT_SYMBOL_GPL(br_dev_queue_push_xmit
   4
   5  int br_forward_finish(struct sk_buff *skb)
   6  {
   7 -       return NF_HOOK(NFPROTO_BRIDGE, NF_BR_POST_ROUTING, skb, NULL, skb->dev,
   8 +       return BR_HOOK(NFPROTO_BRIDGE, NF_BR_POST_ROUTING, skb, NULL, skb->dev,
   9                        br_dev_queue_push_xmit);
  10
  11  }
  12 @@ -77,7 +77,7 @@ static void __br_deliver(const struct ne
  13                 return;
  14         }
  15
  16 -       NF_HOOK(NFPROTO_BRIDGE, NF_BR_LOCAL_OUT, skb, NULL, skb->dev,
  17 +       BR_HOOK(NFPROTO_BRIDGE, NF_BR_LOCAL_OUT, skb, NULL, skb->dev,
  18                 br_forward_finish);
  19  }
  20
  21 @@ -98,7 +98,7 @@ static void __br_forward(const struct ne
  22         skb->dev = to->dev;
  23         skb_forward_csum(skb);
  24
  25 -       NF_HOOK(NFPROTO_BRIDGE, NF_BR_FORWARD, skb, indev, skb->dev,
  26 +       BR_HOOK(NFPROTO_BRIDGE, NF_BR_FORWARD, skb, indev, skb->dev,
  27                 br_forward_finish);
  28  }
  29
  30 --- a/net/bridge/br_input.c
  31 +++ b/net/bridge/br_input.c
  32 @@ -53,7 +53,7 @@ static int br_pass_frame_up(struct sk_bu
  33         if (!skb)
  34                 return NET_RX_DROP;
  35
  36 -       return NF_HOOK(NFPROTO_BRIDGE, NF_BR_LOCAL_IN, skb, indev, NULL,
  37 +       return BR_HOOK(NFPROTO_BRIDGE, NF_BR_LOCAL_IN, skb, indev, NULL,
  38                        netif_receive_skb);
  39  }
  40
  41 @@ -219,7 +219,7 @@ rx_handler_result_t br_handle_frame(stru
  42                 }
  43
  44                 /* Deliver packet to local host only */
  45 -               if (NF_HOOK(NFPROTO_BRIDGE, NF_BR_LOCAL_IN, skb, skb->dev,
  46 +               if (BR_HOOK(NFPROTO_BRIDGE, NF_BR_LOCAL_IN, skb, skb->dev,
  47                             NULL, br_handle_local_finish)) {
  48                         return RX_HANDLER_CONSUMED; /* consumed by filter */
  49                 } else {
  50 @@ -234,7 +234,7 @@ forward:
  51                 if (ether_addr_equal(p->br->dev->dev_addr, dest))
  52                         skb->pkt_type = PACKET_HOST;
  53
  54 -               if (NF_HOOK(NFPROTO_BRIDGE, NF_BR_PRE_ROUTING, skb, skb->dev, NULL,
  55 +               if (BR_HOOK(NFPROTO_BRIDGE, NF_BR_PRE_ROUTING, skb, skb->dev, NULL,
  56                         br_handle_local_finish))
  57                         break;
  58
  59 @@ -256,7 +256,7 @@ forward:
  60                 if (ether_addr_equal(p->br->dev->dev_addr, dest))
  61                         skb->pkt_type = PACKET_HOST;
  62
  63 -               NF_HOOK(NFPROTO_BRIDGE, NF_BR_PRE_ROUTING, skb, skb->dev, NULL,
  64 +               BR_HOOK(NFPROTO_BRIDGE, NF_BR_PRE_ROUTING, skb, skb->dev, NULL,
  65                         br_handle_frame_finish);
  66                 break;
  67         default:
  68 --- a/net/bridge/br_multicast.c
  69 +++ b/net/bridge/br_multicast.c
  70 @@ -814,7 +814,7 @@ static void __br_multicast_send_query(st
  71
  72         if (port) {
  73                 skb->dev = port->dev;
  74 -               NF_HOOK(NFPROTO_BRIDGE, NF_BR_LOCAL_OUT, skb, NULL, skb->dev,
  75 +               BR_HOOK(NFPROTO_BRIDGE, NF_BR_LOCAL_OUT, skb, NULL, skb->dev,
  76                         br_dev_queue_push_xmit);
  77         } else {
  78                 br_multicast_select_own_querier(br, ip, skb);
  79 --- a/net/bridge/br_netfilter.c
  80 +++ b/net/bridge/br_netfilter.c
  81 @@ -73,6 +73,15 @@ static int brnf_pass_vlan_indev __read_m
  82  #define IS_ARP(skb) \
  83         (!vlan_tx_tag_present(skb) && skb->protocol == htons(ETH_P_ARP))
  84
  85 +int brnf_call_ebtables __read_mostly = 0;
  86 +EXPORT_SYMBOL_GPL(brnf_call_ebtables);
  87 +
  88 +bool br_netfilter_run_hooks(void)
  89 +{
  90 +       return brnf_call_iptables | brnf_call_ip6tables | brnf_call_arptables |
  91 +              brnf_call_ebtables;
  92 +}
  93 +
  94  static inline __be16 vlan_proto(const struct sk_buff *skb)
  95  {
  96         if (vlan_tx_tag_present(skb))
  97 --- a/net/bridge/br_private.h
  98 +++ b/net/bridge/br_private.h
  99 @@ -778,6 +778,24 @@ static inline void br_nf_core_fini(void)
 100  #define br_netfilter_rtable_init(x)
 101  #endif
 102
 103 +#if IS_BUILTIN(CONFIG_BRIDGE_NETFILTER)
 104 +extern int brnf_call_ebtables;
 105 +bool br_netfilter_run_hooks(void);
 106 +#else
 107 +#define br_netfilter_run_hooks()       false
 108 +#endif
 109 +
 110 +static inline int
 111 +BR_HOOK(uint8_t pf, unsigned int hook, struct sk_buff *skb,
 112 +       struct net_device *in, struct net_device *out,
 113 +       int (*okfn)(struct sk_buff *))
 114 +{
 115 +       if (!br_netfilter_run_hooks())
 116 +               return okfn(skb);
 117 +
 118 +       return NF_HOOK(pf, hook, skb, in, out, okfn);
 119 +}
 120 +
 121  /* br_stp.c */
 122  void br_log_state(const struct net_bridge_port *p);
 123  void br_set_state(struct net_bridge_port *p, unsigned int state);
 124 --- a/net/bridge/br_stp_bpdu.c
 125 +++ b/net/bridge/br_stp_bpdu.c
 126 @@ -54,7 +54,7 @@ static void br_send_bpdu(struct net_brid
 127
 128         skb_reset_mac_header(skb);
 129
 130 -       NF_HOOK(NFPROTO_BRIDGE, NF_BR_LOCAL_OUT, skb, NULL, skb->dev,
 131 +       BR_HOOK(NFPROTO_BRIDGE, NF_BR_LOCAL_OUT, skb, NULL, skb->dev,
 132                 dev_queue_xmit);
 133  }
 134
 135 --- a/net/bridge/netfilter/ebtables.c
 136 +++ b/net/bridge/netfilter/ebtables.c
 137 @@ -2414,11 +2414,19 @@ static int __init ebtables_init(void)
 138         }
 139
 140         printk(KERN_INFO "Ebtables v2.0 registered\n");
 141 +
 142 +#if IS_BUILTIN(CONFIG_BRIDGE_NETFILTER)
 143 +       brnf_call_ebtables = 1;
 144 +#endif
 145 +
 146         return 0;
 147  }
 148
 149  static void __exit ebtables_fini(void)
 150  {
 151 +#if IS_BUILTIN(CONFIG_BRIDGE_NETFILTER)
 152 +       brnf_call_ebtables = 0;
 153 +#endif
 154         nf_unregister_sockopt(&ebt_sockopts);
 155         xt_unregister_target(&ebt_standard_target);
 156         printk(KERN_INFO "Ebtables v2.0 unregistered\n");
 157 --- a/net/Kconfig
 158 +++ b/net/Kconfig
 159 @@ -177,11 +177,11 @@ config NETFILTER_ADVANCED
 160           If unsure, say Y.
 161
 162  config BRIDGE_NETFILTER
 163 -       tristate "Bridged IP/ARP packets filtering"
 164 +       bool "Bridged IP/ARP packets filtering"
 165         depends on BRIDGE
 166         depends on NETFILTER && INET
 167         depends on NETFILTER_ADVANCED
 168 -       default m
 169 +       default y
 170         ---help---
 171           Enabling this option will let arptables resp. iptables see bridged
 172           ARP resp. IP traffic. If you want a bridging firewall, you probably