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Correctly handle high latency paths

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Signed-off-by: Adrien Gallouët <adrien@gallouet.fr>
This commit is contained in:
Adrien Gallouët
2019-02-15 10:23:58 +00:00
parent 40983ee4f1
commit cef20db3c7
1 changed files with 15 additions and 4 deletions
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19
mud.c
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@@ -65,6 +65,7 @@
#define MUD_MSG_MARK(X) ((X) | UINT64_C(1))
#define MUD_MSG_TC (192) // CS6
#define MUD_MSG_SENT_MAX (10)
#define MUD_MSG_MIN_RTT (100 * MUD_ONE_MSEC)
#define MUD_PKT_MIN_SIZE (MUD_U48_SIZE + MUD_MAC_SIZE)
#define MUD_PKT_MAX_SIZE (1500U)
@@ -75,7 +76,6 @@
#define MUD_TIME_BITS (48)
#define MUD_TIME_MASK(X) ((X) & ((UINT64_C(1) << MUD_TIME_BITS) - 2))
#define MUD_SEND_TIMEOUT (100 * MUD_ONE_MSEC)
#define MUD_WINDOW_TIMEOUT ( 50 * MUD_ONE_MSEC)
#define MUD_KEYX_TIMEOUT ( 60 * MUD_ONE_MIN)
#define MUD_KEYX_RESET_TIMEOUT (200 * MUD_ONE_MSEC)
@@ -1386,14 +1386,25 @@ mud_recv(struct mud *mud, void *data, size_t size)
return MUD_MSG(send_time) ? 0 : ret;
}
static uint64_t
mud_path_timeout(struct mud_path *path)
{
if (!path->rtt.setup)
return MUD_MSG_MIN_RTT;
const uint64_t rtt = (path->rtt.val + path->rtt.var) << 1;
return rtt > MUD_MSG_MIN_RTT ? rtt : MUD_MSG_MIN_RTT;
}
static void
mud_probe_mtu(struct mud *mud, struct mud_path *path, uint64_t now)
{
if (path->mtu.min > path->mtu.max)
return;
if (path->mtu.count && path->rtt.setup &&
!mud_timeout(now, path->mtu.time, path->rtt.val + 4 * path->rtt.var))
if (path->mtu.count &&
!mud_timeout(now, path->mtu.time, mud_path_timeout(path)))
return;
path->mtu.time = now;
@@ -1455,7 +1466,7 @@ mud_update(struct mud *mud, uint64_t now)
}
if (mud->peer.set) {
if (mud_timeout(now, path->send.msg_time, MUD_SEND_TIMEOUT))
if (mud_timeout(now, path->send.msg_time, mud_path_timeout(path)))
mud_send_msg(mud, path, now, 0, 0, 0, 0);
}