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tun/netstack: simplify read timeout on ping socket

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I'm not 100% sure this is correct, but it certainly is a lot simpler.

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
This commit is contained in:
Jason A. Donenfeld 2022-02-02 23:30:31 +01:00
parent b9669b734e
commit 3b95c81cc1
1 changed files with 14 additions and 43 deletions
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41
tun/netstack/tun.go
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@ -17,7 +17,6 @@ import (
"regexp"
"strconv"
"strings"
"sync"
"time"
"golang.zx2c4.com/go118/netip"
@ -298,9 +297,7 @@ type PingConn struct {
raddr PingAddr
wq waiter.Queue
ep tcpip.Endpoint
mu sync.RWMutex
deadline time.Time
deadlineBreaker chan struct{}
deadline *time.Timer
}
type PingAddr struct{ addr netip.Addr }
@ -349,8 +346,9 @@ func (net *Net) DialPingAddr(laddr, raddr netip.Addr) (*PingConn, error) {
pc := &PingConn{
laddr: PingAddr{laddr},
deadlineBreaker: make(chan struct{}, 1),
deadline: time.NewTimer(time.Hour << 10),
}
pc.deadline.Stop()
ep, tcpipErr := net.stack.NewEndpoint(tn, pn, &pc.wq)
if tcpipErr != nil {
@ -408,7 +406,7 @@ func (pc *PingConn) RemoteAddr() net.Addr {
}
func (pc *PingConn) Close() error {
close(pc.deadlineBreaker)
pc.deadline.Reset(0)
pc.ep.Close()
return nil
}
@ -454,33 +452,10 @@ func (pc *PingConn) ReadFrom(p []byte) (n int, addr net.Addr, err error) {
pc.wq.EventRegister(&e, waiter.EventIn)
defer pc.wq.EventUnregister(&e)
ready := false
for !ready {
pc.mu.RLock()
deadlineBreaker := pc.deadlineBreaker
deadline := pc.deadline
pc.mu.RUnlock()
if deadline.IsZero() {
select {
case <-deadlineBreaker:
case <-notifyCh:
ready = true
}
} else {
t := time.NewTimer(deadline.Sub(time.Now()))
defer t.Stop()
select {
case <-t.C:
case <-pc.deadline.C:
return 0, nil, os.ErrDeadlineExceeded
case <-deadlineBreaker:
case <-notifyCh:
ready = true
}
}
}
w := tcpip.SliceWriter(p)
@ -508,11 +483,7 @@ func (pc *PingConn) SetDeadline(t time.Time) error {
}
func (pc *PingConn) SetReadDeadline(t time.Time) error {
pc.mu.Lock()
defer pc.mu.Unlock()
close(pc.deadlineBreaker)
pc.deadlineBreaker = make(chan struct{}, 1)
pc.deadline = t
pc.deadline.Reset(t.Sub(time.Now()))
return nil
}