syncookies: do not store rcv_wscale in tcp timestamp

As pointed out by Fernando Gont there is no need to encode rcv_wscale
into the cookie.

We did not use the restored rcv_wscale anyway; it is recomputed
via tcp_select_initial_window().

Thus we can save 4 bits in the ts option space by removing rcv_wscale.
In case window scaling was not supported, we set the (invalid) wscale
value 0xf.

Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 14 insertions, 21 deletions

diff --git a/net/ipv4/syncookies.c b/net/ipv4/syncookies.c
index 51b5662545d6..8896329aebd0 100644
--- a/net/ipv4/syncookies.c
+++ b/net/ipv4/syncookies.c
@@ -18,8 +18,8 @@
 #include <net/tcp.h>
 #include <net/route.h>
 
-/* Timestamps: lowest 9 bits store TCP options */
-#define TSBITS 9
+/* Timestamps: lowest bits store TCP options */
+#define TSBITS 5
 #define TSMASK (((__u32)1 << TSBITS) - 1)
 
 extern int sysctl_tcp_syncookies;
@@ -58,7 +58,7 @@ static u32 cookie_hash(__be32 saddr, __be32 daddr, __be16 sport, __be16 dport,
 
 /*
  * when syncookies are in effect and tcp timestamps are enabled we encode
- * tcp options in the lowest 9 bits of the timestamp value that will be
+ * tcp options in the lower bits of the timestamp value that will be
  * sent in the syn-ack.
  * Since subsequent timestamps use the normal tcp_time_stamp value, we
  * must make sure that the resulting initial timestamp is <= tcp_time_stamp.
@@ -70,11 +70,9 @@ __u32 cookie_init_timestamp(struct request_sock *req)
         u32 options = 0;
 
         ireq = inet_rsk(req);
-        if (ireq->wscale_ok) {
-                options = ireq->snd_wscale;
-                options |= ireq->rcv_wscale << 4;
-        }
-        options |= ireq->sack_ok << 8;
+
+        options = ireq->wscale_ok ? ireq->snd_wscale : 0xf;
+        options |= ireq->sack_ok << 4;
 
         ts = ts_now & ~TSMASK;
         ts |= options;
@@ -227,15 +225,14 @@ static inline struct sock *get_cookie_sock(struct sock *sk, struct sk_buff *skb,
  * additional tcp options in the timestamp.
  * This extracts these options from the timestamp echo.
  *
- * The lowest 4 bits are for snd_wscale
- * The next 4 lsb are for rcv_wscale
+ * The lowest 4 bits store snd_wscale.
  * The next lsb is for sack_ok
  *
  * return false if we decode an option that should not be.
  */
 bool cookie_check_timestamp(struct tcp_options_received *tcp_opt)
 {
-        /* echoed timestamp, 9 lowest bits contain options */
+        /* echoed timestamp, lowest bits contain options */
         u32 options = tcp_opt->rcv_tsecr & TSMASK;
 
         if (!tcp_opt->saw_tstamp)  {
@@ -246,20 +243,17 @@ bool cookie_check_timestamp(struct tcp_options_received *tcp_opt)
         if (!sysctl_tcp_timestamps)
                 return false;
 
-        tcp_opt->snd_wscale = options & 0xf;
-        options >>= 4;
-        tcp_opt->rcv_wscale = options & 0xf;
-
         tcp_opt->sack_ok = (options >> 4) & 0x1;
 
         if (tcp_opt->sack_ok && !sysctl_tcp_sack)
                 return false;
 
-        if (tcp_opt->snd_wscale || tcp_opt->rcv_wscale) {
-                tcp_opt->wscale_ok = 1;
-                return sysctl_tcp_window_scaling != 0;
-        }
-        return true;
+        if ((options & 0xf) == 0xf)
+                return true; /* no window scaling */
+
+        tcp_opt->wscale_ok = 1;
+        tcp_opt->snd_wscale = options & 0xf;
+        return sysctl_tcp_window_scaling != 0;
 }
 EXPORT_SYMBOL(cookie_check_timestamp);
 
@@ -313,7 +307,6 @@ struct sock *cookie_v4_check(struct sock *sk, struct sk_buff *skb,
         ireq->rmt_addr          = ip_hdr(skb)->saddr;
         ireq->ecn_ok            = 0;
         ireq->snd_wscale        = tcp_opt.snd_wscale;
-        ireq->rcv_wscale        = tcp_opt.rcv_wscale;
         ireq->sack_ok           = tcp_opt.sack_ok;
         ireq->wscale_ok         = tcp_opt.wscale_ok;
         ireq->tstamp_ok         = tcp_opt.saw_tstamp;