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fix bug: udp write 提供了对外封装的Write()

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表现为一个阻塞操作，如果本地arp缓存失效，就会重新发起一次arp广播，更新目标ip地址的MAC 更新后将再次尝试写数据
This commit is contained in:
impact-eintr
2022-12-02 21:59:13 +08:00
parent 050d5fec97
commit 2d9434d260
4 changed files with 19 additions and 9 deletions
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8
tcpip/stack/linkaddrcache.go
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@@ -201,7 +201,8 @@ func (c *linkAddrCache) makeAndAddEntry(k tcpip.FullAddress, v tcpip.LinkAddress
}
// get reports any known link address for k.
func (c *linkAddrCache) get(k tcpip.FullAddress, linkRes LinkAddressResolver, localAddr tcpip.Address, linkEP LinkEndpoint, waker *sleep.Waker) (tcpip.LinkAddress, <-chan struct{}, *tcpip.Error) {
func (c *linkAddrCache) get(k tcpip.FullAddress, linkRes LinkAddressResolver,
localAddr tcpip.Address, linkEP LinkEndpoint, waker *sleep.Waker) (tcpip.LinkAddress, <-chan struct{}, *tcpip.Error) {
log.Println("在arp本地缓存中寻找", k)
if linkRes != nil {
if addr, ok := linkRes.ResolveStaticAddress(k.Addr); ok {
@@ -214,7 +215,7 @@ func (c *linkAddrCache) get(k tcpip.FullAddress, linkRes LinkAddressResolver, lo
// 尝试从缓存中得到MAC地址
if entry, ok := c.cache[k]; ok {
switch s := entry.state(); s {
case expired:
case expired: // 过期了
case ready:
return entry.linkAddr, nil, nil
case failed:
@@ -251,7 +252,8 @@ func (c *linkAddrCache) removeWaker(k tcpip.FullAddress, waker *sleep.Waker) {
}
}
func (c *linkAddrCache) startAddressResolution(k tcpip.FullAddress, linkRes LinkAddressResolver, localAddr tcpip.Address, linkEP LinkEndpoint, done <-chan struct{}) {
func (c *linkAddrCache) startAddressResolution(k tcpip.FullAddress, linkRes LinkAddressResolver,
localAddr tcpip.Address, linkEP LinkEndpoint, done <-chan struct{}) {
for i := 0; ; i++ {
// Send link request, then wait for the timeout limit and check
// whether the request succeeded.