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wgengine/magicsock: improve don't fragment bit set/get support

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Add an enable/disable argument to setDontFragment() in preparation for dynamic
enable/disable of peer path MTU discovery. Add getDontFragment() to get the
status of the don't fragment bit from a socket.

Updates #311

Co-authored-by: James Tucker <james@tailscale.com>
Signed-off-by: Val <valerie@tailscale.com>
This commit is contained in:
Val
2023-09-18 20:23:27 +02:00
committed by valscale
parent 4c793014af
commit a5ae21a832
8 changed files with 159 additions and 46 deletions
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11
wgengine/magicsock/rebinding_conn.go
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@@ -9,6 +9,7 @@ import (
"net/netip"
"sync"
"sync/atomic"
"syscall"
"golang.org/x/net/ipv6"
"tailscale.com/net/netaddr"
@@ -166,3 +167,13 @@ func (c *RebindingUDPConn) writeToUDPAddrPortWithInitPconn(pconn nettype.PacketC
func (c *RebindingUDPConn) WriteToUDPAddrPort(b []byte, addr netip.AddrPort) (int, error) {
return c.writeToUDPAddrPortWithInitPconn(*c.pconnAtomic.Load(), b, addr)
}
func (c *RebindingUDPConn) SyscallConn() (syscall.RawConn, error) {
c.mu.Lock()
defer c.mu.Unlock()
sc, ok := c.pconn.(syscall.Conn)
if !ok {
return nil, errUnsupportedConnType
}
return sc.SyscallConn()
}