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Serialize overlay filter plumbing

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When plumbing overlay filter rules serialize this to make sure that
multiple sandbox join or leave is not causing erroneous behavior while
moving the RETURN rule in the predefined chains.

Signed-off-by: Jana Radhakrishnan <mrjana@docker.com>
This commit is contained in:
Jana Radhakrishnan 2016-09-22 17:50:19 -07:00
parent cfe5b1467e
commit d6e596b3a0
1 changed files with 15 additions and 0 deletions
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15
libnetwork/drivers/overlay/filter.go
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@ -12,6 +12,13 @@ const globalChain = "DOCKER-OVERLAY"
var filterOnce sync.Once
var filterChan = make(chan struct{}, 1)
func filterWait() func() {
filterChan <- struct{}{}
return func() { <-filterChan }
}
func chainExists(cname string) bool {
if _, err := iptables.Raw("-L", cname); err != nil {
return false
@ -69,10 +76,14 @@ func setNetworkChain(cname string, remove bool) error {
}
func addNetworkChain(cname string) error {
defer filterWait()()
return setNetworkChain(cname, false)
}
func removeNetworkChain(cname string) error {
defer filterWait()()
return setNetworkChain(cname, true)
}
@ -119,9 +130,13 @@ func setFilters(cname, brName string, remove bool) error {
}
func addFilters(cname, brName string) error {
defer filterWait()()
return setFilters(cname, brName, false)
}
func removeFilters(cname, brName string) error {
defer filterWait()()
return setFilters(cname, brName, true)
}