#include <linux/netfilter_bridge.h>
#include "br_private.h"
-const unsigned char bridge_ula[6] = { 0x01, 0x80, 0xc2, 0x00, 0x00, 0x00 };
+/* Bridge group multicast address 802.1d (pg 51). */
+const u8 br_group_address[ETH_ALEN] = { 0x01, 0x80, 0xc2, 0x00, 0x00, 0x00 };
static void br_pass_frame_up(struct net_bridge *br, struct sk_buff *skb)
{
}
if (is_multicast_ether_addr(dest)) {
+ br->statistics.multicast++;
br_flood_forward(br, skb, !passedup);
if (!passedup)
br_pass_frame_up(br, skb);
goto out;
}
+/* note: already called with rcu_read_lock (preempt_disabled) */
+static int br_handle_local_finish(struct sk_buff *skb)
+{
+ struct net_bridge_port *p = rcu_dereference(skb->dev->br_port);
+
+ if (p && p->state != BR_STATE_DISABLED)
+ 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)
+{
+ const u16 *a = (const u16 *) dest;
+ static const u16 *const b = (const u16 *const ) br_group_address;
+ static const u16 m = __constant_cpu_to_be16(0xfff0);
+
+ return ((a[0] ^ b[0]) | (a[1] ^ b[1]) | ((a[2] ^ b[2]) & m)) == 0;
+}
+
/*
* Called via br_handle_frame_hook.
- * Return 0 if *pskb should be processed furthur
- * 1 if *pskb is handled
- * note: already called with rcu_read_lock (preempt_disabled)
+ * Return NULL if skb is handled
+ * note: already called with rcu_read_lock (preempt_disabled)
*/
-int br_handle_frame(struct net_bridge_port *p, struct sk_buff **pskb)
+struct sk_buff *br_handle_frame(struct net_bridge_port *p, struct sk_buff *skb)
{
- struct sk_buff *skb = *pskb;
const unsigned char *dest = eth_hdr(skb)->h_dest;
- if (p->state == BR_STATE_DISABLED)
- goto err;
-
if (!is_valid_ether_addr(eth_hdr(skb)->h_source))
- goto err;
-
- if (p->br->stp_enabled &&
- !memcmp(dest, bridge_ula, 5) &&
- !(dest[5] & 0xF0)) {
- if (!dest[5]) {
- NF_HOOK(PF_BRIDGE, NF_BR_LOCAL_IN, skb, skb->dev,
- NULL, br_stp_handle_bpdu);
- return 1;
+ goto drop;
+
+ if (unlikely(is_link_local(dest))) {
+ /* Pause frames shouldn't be passed up by driver anyway */
+ if (skb->protocol == htons(ETH_P_PAUSE))
+ goto drop;
+
+ /* Process STP BPDU's through normal netif_receive_skb() path */
+ if (p->br->stp_enabled != BR_NO_STP) {
+ if (NF_HOOK(PF_BRIDGE, NF_BR_LOCAL_IN, skb, skb->dev,
+ NULL, br_handle_local_finish))
+ return NULL;
+ else
+ return skb;
}
- goto err;
}
- if (p->state == BR_STATE_FORWARDING || p->state == BR_STATE_LEARNING) {
+ switch (p->state) {
+ case BR_STATE_FORWARDING:
+
if (br_should_route_hook) {
- if (br_should_route_hook(pskb))
- return 0;
- skb = *pskb;
+ if (br_should_route_hook(&skb))
+ return skb;
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(PF_BRIDGE, NF_BR_PRE_ROUTING, skb, skb->dev, NULL,
br_handle_frame_finish);
- return 1;
+ break;
+ default:
+drop:
+ kfree_skb(skb);
}
-
-err:
- kfree_skb(skb);
- return 1;
+ return NULL;
}