zte's code,first commit
Change-Id: I9a04da59e459a9bc0d67f101f700d9d7dc8d681b
diff --git a/ap/os/linux/linux-3.4.x/net/bridge/br_input.c b/ap/os/linux/linux-3.4.x/net/bridge/br_input.c
new file mode 100644
index 0000000..25b4b5e
--- /dev/null
+++ b/ap/os/linux/linux-3.4.x/net/bridge/br_input.c
@@ -0,0 +1,232 @@
+/*
+ * Handle incoming frames
+ * Linux ethernet bridge
+ *
+ * Authors:
+ * Lennert Buytenhek <buytenh@gnu.org>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+
+#include <linux/slab.h>
+#include <linux/kernel.h>
+#include <linux/netdevice.h>
+#include <linux/etherdevice.h>
+#include <linux/netfilter_bridge.h>
+#include <linux/export.h>
+#include "br_private.h"
+
+/* Bridge group multicast address 802.1d (pg 51). */
+const u8 br_group_address[ETH_ALEN] = { 0x01, 0x80, 0xc2, 0x00, 0x00, 0x00 };
+
+/* Hook for brouter */
+br_should_route_hook_t __rcu *br_should_route_hook __read_mostly;
+EXPORT_SYMBOL(br_should_route_hook);
+
+static int br_pass_frame_up(struct sk_buff *skb)
+{
+ struct net_device *indev, *brdev = BR_INPUT_SKB_CB(skb)->brdev;
+ struct net_bridge *br = netdev_priv(brdev);
+ struct br_cpu_netstats *brstats = this_cpu_ptr(br->stats);
+
+ u64_stats_update_begin(&brstats->syncp);
+ brstats->rx_packets++;
+ brstats->rx_bytes += skb->len;
+ u64_stats_update_end(&brstats->syncp);
+
+ indev = skb->dev;
+ skb->dev = brdev;
+
+ return NF_HOOK(NFPROTO_BRIDGE, NF_BR_LOCAL_IN, skb, indev, NULL,
+ netif_receive_skb);
+}
+
+/* note: already called with rcu_read_lock */
+int br_handle_frame_finish(struct sk_buff *skb)
+{
+ const unsigned char *dest = eth_hdr(skb)->h_dest;
+ struct net_bridge_port *p = br_port_get_rcu(skb->dev);
+ struct net_bridge *br;
+ struct net_bridge_fdb_entry *dst;
+ struct net_bridge_mdb_entry *mdst;
+ struct sk_buff *skb2;
+
+ if (!p || p->state == BR_STATE_DISABLED)
+ goto drop;
+
+ /* insert into forwarding database after filtering to avoid spoofing */
+ br = p->br;
+ br_fdb_update(br, p, eth_hdr(skb)->h_source);
+
+ if (!is_broadcast_ether_addr(dest) && is_multicast_ether_addr(dest) &&
+ br_multicast_rcv(br, p, skb))
+ goto drop;
+
+ if (p->state == BR_STATE_LEARNING)
+ goto drop;
+
+ BR_INPUT_SKB_CB(skb)->brdev = br->dev;
+
+ /* The packet skb2 goes to the local host (NULL to skip). */
+ skb2 = NULL;
+
+ if (br->dev->flags & IFF_PROMISC)
+ skb2 = skb;
+
+ dst = NULL;
+
+ if (is_broadcast_ether_addr(dest))
+ skb2 = skb;
+ else if (is_multicast_ether_addr(dest)) {
+ mdst = br_mdb_get(br, skb);
+ if (mdst || BR_INPUT_SKB_CB_MROUTERS_ONLY(skb)) {
+ if ((mdst && mdst->mglist) ||
+ br_multicast_is_router(br))
+ skb2 = skb;
+ br_multicast_forward(mdst, skb, skb2);
+ skb = NULL;
+ if (!skb2)
+ goto out;
+ } else
+ skb2 = skb;
+
+ br->dev->stats.multicast++;
+ } else if ((dst = __br_fdb_get(br, dest)) && dst->is_local) {
+ skb2 = skb;
+ /* Do not forward the packet since it's local. */
+ skb = NULL;
+ }
+
+ if (skb) {
+ if (dst) {
+ dst->used = jiffies;
+ br_forward(dst->dst, skb, skb2);
+ } else{
+ br_flood_forward(br, skb, skb2);
+ skbinfo_add(NULL,SKB_FLOOD);
+ }
+ }
+
+ if (skb2)
+ return br_pass_frame_up(skb2);
+
+out:
+ return 0;
+drop:
+ kfree_skb(skb);
+ goto out;
+}
+
+/* note: already called with rcu_read_lock */
+static int br_handle_local_finish(struct sk_buff *skb)
+{
+ struct net_bridge_port *p = br_port_get_rcu(skb->dev);
+
+ br_fdb_update(p->br, p, eth_hdr(skb)->h_source);
+ return 0; /* process further */
+}
+
+/* Does address match the link local multicast address.
+ * 01:80:c2:00:00:0X
+ */
+static inline int is_link_local(const unsigned char *dest)
+{
+ __be16 *a = (__be16 *)dest;
+ static const __be16 *b = (const __be16 *)br_group_address;
+ static const __be16 m = cpu_to_be16(0xfff0);
+
+ return ((a[0] ^ b[0]) | (a[1] ^ b[1]) | ((a[2] ^ b[2]) & m)) == 0;
+}
+
+/*
+ * Return NULL if skb is handled
+ * note: already called with rcu_read_lock
+ */
+rx_handler_result_t br_handle_frame(struct sk_buff **pskb)
+{
+ struct net_bridge_port *p;
+ struct sk_buff *skb = *pskb;
+ const unsigned char *dest = eth_hdr(skb)->h_dest;
+ br_should_route_hook_t *rhook;
+
+ if (unlikely(skb->pkt_type == PACKET_LOOPBACK))
+ return RX_HANDLER_PASS;
+
+ if (!is_valid_ether_addr(eth_hdr(skb)->h_source))
+ goto drop;
+
+ skb = skb_share_check(skb, GFP_ATOMIC);
+ if (!skb)
+ return RX_HANDLER_CONSUMED;
+
+ p = br_port_get_rcu(skb->dev);
+
+ if (unlikely(is_link_local(dest))) {
+ /*
+ * See IEEE 802.1D Table 7-10 Reserved addresses
+ *
+ * Assignment Value
+ * Bridge Group Address 01-80-C2-00-00-00
+ * (MAC Control) 802.3 01-80-C2-00-00-01
+ * (Link Aggregation) 802.3 01-80-C2-00-00-02
+ * 802.1X PAE address 01-80-C2-00-00-03
+ *
+ * 802.1AB LLDP 01-80-C2-00-00-0E
+ *
+ * Others reserved for future standardization
+ */
+ switch (dest[5]) {
+ case 0x00: /* Bridge Group Address */
+ /* If STP is turned off,
+ then must forward to keep loop detection */
+ if (p->br->stp_enabled == BR_NO_STP)
+ goto forward;
+ break;
+
+ case 0x01: /* IEEE MAC (Pause) */
+ goto drop;
+
+ default:
+ /* Allow selective forwarding for most other protocols */
+ if (p->br->group_fwd_mask & (1u << dest[5]))
+ goto forward;
+ }
+
+ /* Deliver packet to local host only */
+ if (NF_HOOK(NFPROTO_BRIDGE, NF_BR_LOCAL_IN, skb, skb->dev,
+ NULL, br_handle_local_finish)) {
+ return RX_HANDLER_CONSUMED; /* consumed by filter */
+ } else {
+ *pskb = skb;
+ return RX_HANDLER_PASS; /* continue processing */
+ }
+ }
+
+forward:
+ switch (p->state) {
+ case BR_STATE_FORWARDING:
+ rhook = rcu_dereference(br_should_route_hook);
+ if (rhook) {
+ if ((*rhook)(skb)) {
+ *pskb = skb;
+ return RX_HANDLER_PASS;
+ }
+ dest = eth_hdr(skb)->h_dest;
+ }
+ /* fall through */
+ case BR_STATE_LEARNING:
+ if (!compare_ether_addr(p->br->dev->dev_addr, dest))
+ skb->pkt_type = PACKET_HOST;
+
+ NF_HOOK(NFPROTO_BRIDGE, NF_BR_PRE_ROUTING, skb, skb->dev, NULL,
+ br_handle_frame_finish);
+ break;
+ default:
+drop:
+ kfree_skb(skb);
+ }
+ return RX_HANDLER_CONSUMED;
+}