[BRIDGE]: drop PAUSE frames

Pause frames should never make it out of the network device into
the stack. But if a device was misconfigured, it might happen.
So drop pause frames in bridge.

Signed-off-by: Stephen Hemminger <shemminger@linux-foundation.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/include/linux/if_ether.h b/include/linux/if_ether.h
index f6863fb..1db774c 100644 (file)
--- a/include/linux/if_ether.h
+++ b/include/linux/if_ether.h
@@ -61,6 +61,7 @@
 #define ETH_P_8021Q    0x8100          /* 802.1Q VLAN Extended Header  */
 #define ETH_P_IPX      0x8137          /* IPX over DIX                 */
 #define ETH_P_IPV6     0x86DD          /* IPv6 over bluebook           */
+#define ETH_P_PAUSE    0x8808          /* IEEE Pause frames. See 802.3 31B */
 #define ETH_P_SLOW     0x8809          /* Slow Protocol. See 802.3ad 43B */
 #define ETH_P_WCCP     0x883E          /* Web-cache coordination protocol
                                         * defined in draft-wilson-wrec-wccp-v2-00.txt */

diff --git a/net/bridge/br_input.c b/net/bridge/br_input.c
index 364e0ba..5662567 100644 (file)
--- a/net/bridge/br_input.c
+++ b/net/bridge/br_input.c
@@ -131,9 +131,14 @@ struct sk_buff *br_handle_frame(struct net_bridge_port *p, struct sk_buff *skb)
        if (!is_valid_ether_addr(eth_hdr(skb)->h_source))
                goto drop;
 
-       if (unlikely(is_link_local(dest)))
+       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;
+
                return (NF_HOOK(PF_BRIDGE, NF_BR_LOCAL_IN, skb, skb->dev,
                                NULL, br_handle_local_finish) == 0) ? skb : NULL;
+       }
 
        switch (p->state) {
        case BR_STATE_FORWARDING: