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authorEric Dumazet <edumazet@google.com>2015-03-16 21:06:20 -0700
committerDavid S. Miller <davem@davemloft.net>2015-03-17 15:18:00 -0400
commit7970ddc8f9ffe149b392975da60739ccd1796dea (patch)
tree9c5c365b44d7e6f4e7701d8235402b914ce25b79 /include
parent1bfc4438a7ef99e8a6cba0bd3a86249430256621 (diff)
tcp: uninline tcp_oow_rate_limited()
tcp_oow_rate_limited() is hardly used in fast path, there is no point inlining it. Signed-of-by: Eric Dumazet <edumazet@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include')
-rw-r--r--include/net/tcp.h32
1 files changed, 2 insertions, 30 deletions
diff --git a/include/net/tcp.h b/include/net/tcp.h
index 9fe1d535cd6c..5b29835b81d8 100644
--- a/include/net/tcp.h
+++ b/include/net/tcp.h
@@ -1216,36 +1216,8 @@ static inline bool tcp_paws_reject(const struct tcp_options_received *rx_opt,
return true;
}
-/* Return true if we're currently rate-limiting out-of-window ACKs and
- * thus shouldn't send a dupack right now. We rate-limit dupacks in
- * response to out-of-window SYNs or ACKs to mitigate ACK loops or DoS
- * attacks that send repeated SYNs or ACKs for the same connection. To
- * do this, we do not send a duplicate SYNACK or ACK if the remote
- * endpoint is sending out-of-window SYNs or pure ACKs at a high rate.
- */
-static inline bool tcp_oow_rate_limited(struct net *net,
- const struct sk_buff *skb,
- int mib_idx, u32 *last_oow_ack_time)
-{
- /* Data packets without SYNs are not likely part of an ACK loop. */
- if ((TCP_SKB_CB(skb)->seq != TCP_SKB_CB(skb)->end_seq) &&
- !tcp_hdr(skb)->syn)
- goto not_rate_limited;
-
- if (*last_oow_ack_time) {
- s32 elapsed = (s32)(tcp_time_stamp - *last_oow_ack_time);
-
- if (0 <= elapsed && elapsed < sysctl_tcp_invalid_ratelimit) {
- NET_INC_STATS_BH(net, mib_idx);
- return true; /* rate-limited: don't send yet! */
- }
- }
-
- *last_oow_ack_time = tcp_time_stamp;
-
-not_rate_limited:
- return false; /* not rate-limited: go ahead, send dupack now! */
-}
+bool tcp_oow_rate_limited(struct net *net, const struct sk_buff *skb,
+ int mib_idx, u32 *last_oow_ack_time);
static inline void tcp_mib_init(struct net *net)
{