hyperv: Add handling of IP header with option field in netvsc_set_hash()

In case that the IP header has optional field at the end, this patch will
get the port numbers after that field, and compute the hash. The general
parser skb_flow_dissect() is used here.

Signed-off-by: Haiyang Zhang <haiyangz@microsoft.com>
Reviewed-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/hyperv/netvsc_drv.c b/drivers/net/hyperv/netvsc_drv.c
index 0fcb5e7..9e17d1a 100644 (file)
--- a/drivers/net/hyperv/netvsc_drv.c
+++ b/drivers/net/hyperv/netvsc_drv.c
@@ -162,7 +162,7 @@ union sub_key {
  * data: network byte order
  * return: host byte order
  */
-static u32 comp_hash(u8 *key, int klen, u8 *data, int dlen)
+static u32 comp_hash(u8 *key, int klen, void *data, int dlen)
 {
        union sub_key subk;
        int k_next = 4;
@@ -176,7 +176,7 @@ static u32 comp_hash(u8 *key, int klen, u8 *data, int dlen)
        for (i = 0; i < dlen; i++) {
                subk.kb = key[k_next];
                k_next = (k_next + 1) % klen;
-               dt = data[i];
+               dt = ((u8 *)data)[i];
                for (j = 0; j < 8; j++) {
                        if (dt & 0x80)
                                ret ^= subk.ka;
@@ -190,26 +190,20 @@ static u32 comp_hash(u8 *key, int klen, u8 *data, int dlen)
 
 static bool netvsc_set_hash(u32 *hash, struct sk_buff *skb)
 {
-       struct iphdr *iphdr;
+       struct flow_keys flow;
        int data_len;
-       bool ret = false;
 
-       if (eth_hdr(skb)->h_proto != htons(ETH_P_IP))
+       if (!skb_flow_dissect(skb, &flow) || flow.n_proto != htons(ETH_P_IP))
                return false;
 
-       iphdr = ip_hdr(skb);
+       if (flow.ip_proto == IPPROTO_TCP)
+               data_len = 12;
+       else
+               data_len = 8;
 
-       if (iphdr->version == 4) {
-               if (iphdr->protocol == IPPROTO_TCP)
-                       data_len = 12;
-               else
-                       data_len = 8;
-               *hash = comp_hash(netvsc_hash_key, HASH_KEYLEN,
-                                 (u8 *)&iphdr->saddr, data_len);
-               ret = true;
-       }
+       *hash = comp_hash(netvsc_hash_key, HASH_KEYLEN, &flow, data_len);
 
-       return ret;
+       return true;
 }
 
 static u16 netvsc_select_queue(struct net_device *ndev, struct sk_buff *skb,