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disco,net/tstun,wgengine/magicsock: probe peer MTU

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Automatically probe the path MTU to a peer when peer MTU is enabled, but do not
use the MTU information for anything yet.

Updates #311

Signed-off-by: Val <valerie@tailscale.com>
This commit is contained in:
Val
2023-10-05 20:05:19 +02:00
committed by valscale
parent b4e587c3bd
commit 893bdd729c
7 changed files with 91 additions and 40 deletions
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wgengine/magicsock/magicsock_test.go
+4 -4
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@@ -2936,7 +2936,7 @@ func TestAddrForPingSizeLocked(t *testing.T) {
},
{
desc: "ping_size_too_big_for_trusted_UDP_addr_should_start_discovery_and_send_to_DERP",
size: pktLenToPingSize(1501, validUdpAddr.Addr()),
size: pktLenToPingSize(1501, validUdpAddr.Addr().Is6()),
mtu: 1500,
bestAddr: true,
bestAddrTrusted: true,
@@ -2945,7 +2945,7 @@ func TestAddrForPingSizeLocked(t *testing.T) {
},
{
desc: "ping_size_too_big_for_untrusted_UDP_addr_should_start_discovery_and_send_to_DERP",
size: pktLenToPingSize(1501, validUdpAddr.Addr()),
size: pktLenToPingSize(1501, validUdpAddr.Addr().Is6()),
mtu: 1500,
bestAddr: true,
bestAddrTrusted: false,
@@ -2954,7 +2954,7 @@ func TestAddrForPingSizeLocked(t *testing.T) {
},
{
desc: "ping_size_small_enough_for_trusted_UDP_addr_should_send_to_UDP_and_not_DERP",
size: pktLenToPingSize(1500, validUdpAddr.Addr()),
size: pktLenToPingSize(1500, validUdpAddr.Addr().Is6()),
mtu: 1500,
bestAddr: true,
bestAddrTrusted: true,
@@ -2963,7 +2963,7 @@ func TestAddrForPingSizeLocked(t *testing.T) {
},
{
desc: "ping_size_small_enough_for_untrusted_UDP_addr_should_send_to_UDP_and_DERP",
size: pktLenToPingSize(1500, validUdpAddr.Addr()),
size: pktLenToPingSize(1500, validUdpAddr.Addr().Is6()),
mtu: 1500,
bestAddr: true,
bestAddrTrusted: false,