Widen TCP flags handling.

[sliver-openvswitch.git] / datapath / flow.c

diff --git a/datapath/flow.c b/datapath/flow.c
index 2193a33..510bb87 100644 (file)
--- a/datapath/flow.c
+++ b/datapath/flow.c
@@ -60,20 +60,18 @@ u64 ovs_flow_used_time(unsigned long flow_jiffies)
        return cur_ms - idle_ms;
 }
 
-#define TCP_FLAGS_OFFSET 13
-#define TCP_FLAG_MASK 0x3f
+#define TCP_FLAGS_BE16(tp) (*(__be16 *)&tcp_flag_word(tp) & htons(0x0FFF))
 
 void ovs_flow_stats_update(struct sw_flow *flow, struct sk_buff *skb)
 {
        struct sw_flow_stats *stats = &flow->stats[smp_processor_id()];
-       u8 tcp_flags = 0;
+       __be16 tcp_flags = 0;
 
        if ((flow->key.eth.type == htons(ETH_P_IP) ||
             flow->key.eth.type == htons(ETH_P_IPV6)) &&
            flow->key.ip.proto == IPPROTO_TCP &&
            likely(skb->len >= skb_transport_offset(skb) + sizeof(struct tcphdr))) {
-               u8 *tcp = (u8 *)tcp_hdr(skb);
-               tcp_flags = *(tcp + TCP_FLAGS_OFFSET) & TCP_FLAG_MASK;
+               tcp_flags = TCP_FLAGS_BE16(tcp_hdr(skb));
        }
 
        spin_lock(&stats->lock);