S2io: Fix for LRO Bugs

Resubmitting patch from Al Viro <viro@zeniv.linux.org.uk>, with subject -
[PATCH] s2io LRO bugs.
a) initiate_new_session() sets ->tcp_ack to ntohl(...); everything
   else stores and expects to find there the net-endian value.
b) check for monotonic timestamps in verify_l3_l4_lro_capable()
   compares the value sitting in TCP option (right there in the skb->data,
   net-endian 32bit) with the value picked from earlier packet.
   Doing that without ntohl() is an interesting idea and it might even
   work occasionally; unfortunately, it's quite broken.

Signed-off-by: Surjit Reang <surjit.reang@neterion.com>
Signed-off-by: Ramkrishna Vepa <ram.vepa@neterion.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

2 files changed, 11 insertions, 11 deletions

diff --git a/drivers/net/s2io.c b/drivers/net/s2io.c
index 5fab7d7b5d74..6179a0a2032c 100644
--- a/drivers/net/s2io.c
+++ b/drivers/net/s2io.c
@@ -8118,7 +8118,7 @@ static void initiate_new_session(struct lro *lro, u8 *l2h,
         lro->iph = ip;
         lro->tcph = tcp;
         lro->tcp_next_seq = tcp_pyld_len + ntohl(tcp->seq);
-        lro->tcp_ack = ntohl(tcp->ack_seq);
+        lro->tcp_ack = tcp->ack_seq;
         lro->sg_num = 1;
         lro->total_len = ntohs(ip->tot_len);
         lro->frags_len = 0;
@@ -8127,10 +8127,10 @@ static void initiate_new_session(struct lro *lro, u8 *l2h,
          * already been done.
          */
         if (tcp->doff == 8) {
-                u32 *ptr;
-                ptr = (u32 *)(tcp+1);
+                __be32 *ptr;
+                ptr = (__be32 *)(tcp+1);
                 lro->saw_ts = 1;
-                lro->cur_tsval = *(ptr+1);
+                lro->cur_tsval = ntohl(*(ptr+1));
                 lro->cur_tsecr = *(ptr+2);
         }
         lro->in_use = 1;
@@ -8156,7 +8156,7 @@ static void update_L3L4_header(struct s2io_nic *sp, struct lro *lro)
 
         /* Update tsecr field if this session has timestamps enabled */
         if (lro->saw_ts) {
-                u32 *ptr = (u32 *)(tcp + 1);
+                __be32 *ptr = (__be32 *)(tcp + 1);
                 *(ptr+2) = lro->cur_tsecr;
         }
 
@@ -8181,10 +8181,10 @@ static void aggregate_new_rx(struct lro *lro, struct iphdr *ip,
         lro->window = tcp->window;
 
         if (lro->saw_ts) {
-                u32 *ptr;
+                __be32 *ptr;
                 /* Update tsecr and tsval from this packet */
-                ptr = (u32 *) (tcp + 1);
-                lro->cur_tsval = *(ptr + 1);
+                ptr = (__be32 *)(tcp+1);
+                lro->cur_tsval = ntohl(*(ptr+1));
                 lro->cur_tsecr = *(ptr + 2);
         }
 }
@@ -8235,11 +8235,11 @@ static int verify_l3_l4_lro_capable(struct lro *l_lro, struct iphdr *ip,
 
                 /* Ensure timestamp value increases monotonically */
                 if (l_lro)
-                        if (l_lro->cur_tsval > *((u32 *)(ptr+2)))
+                        if (l_lro->cur_tsval > ntohl(*((__be32 *)(ptr+2))))
                                 return -1;
 
                 /* timestamp echo reply should be non-zero */
-                if (*((u32 *)(ptr+6)) == 0)
+                if (*((__be32 *)(ptr+6)) == 0)
                         return -1;
         }
 
diff --git a/drivers/net/s2io.h b/drivers/net/s2io.h
index 9f6016c6f135..64b88eb48287 100644
--- a/drivers/net/s2io.h
+++ b/drivers/net/s2io.h
@@ -809,7 +809,7 @@ struct lro {
         int             in_use;
         __be16          window;
         u32             cur_tsval;
-        u32             cur_tsecr;
+        __be32          cur_tsecr;
         u8              saw_ts;
 };