diff options
Diffstat (limited to 'net/ipv4')
| -rw-r--r-- | net/ipv4/syncookies.c | 10 |
1 files changed, 9 insertions, 1 deletions
diff --git a/net/ipv4/syncookies.c b/net/ipv4/syncookies.c index 3b4dafefb4b0..62395fdb0ca5 100644 --- a/net/ipv4/syncookies.c +++ b/net/ipv4/syncookies.c @@ -51,6 +51,14 @@ static u32 cookie_hash(__be32 saddr, __be32 daddr, __be16 sport, __be16 dport, count, &syncookie_secret[c]); } +/* Convert one nsec 64bit timestamp to ts (ms or usec resolution) */ +static u64 tcp_ns_to_ts(bool usec_ts, u64 val) +{ + if (usec_ts) + return div_u64(val, NSEC_PER_USEC); + + return div_u64(val, NSEC_PER_MSEC); +} /* * when syncookies are in effect and tcp timestamps are enabled we encode @@ -62,7 +70,7 @@ static u32 cookie_hash(__be32 saddr, __be32 daddr, __be16 sport, __be16 dport, u64 cookie_init_timestamp(struct request_sock *req, u64 now) { const struct inet_request_sock *ireq = inet_rsk(req); - u64 ts, ts_now = tcp_ns_to_ts(now); + u64 ts, ts_now = tcp_ns_to_ts(false, now); u32 options = 0; options = ireq->wscale_ok ? ireq->snd_wscale : TS_OPT_WSCALE_MASK; |