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kubernetes/pkg/proxy
Kubernetes Submit Queue 191d3c5681 Merge pull request #62718 from Lion-Wei/ipvs-host
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Fix problem that ipvs can't work with hostPort

**What this PR does / why we need it**:
Make ipvs proxy mode can work with pods that have hostPort.

**Which issue(s) this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close the issue(s) when PR gets merged)*:
Fixes #61938
#60688 and #60305 are related too.

**Special notes for your reviewer**:
IPVS proxier will create dummy device named `kube-ipvs0`, which will maintain all ipvs virtual service address. That means all ipvs maintained clusterIP/externalIP/ingress will be treat as local address.

Then if we have a pod with hostPort, cni will attach this rule to `PREROUTING` chain:
```
KUBE-HOSTPORTS  all  --  0.0.0.0/0            0.0.0.0/0            /* kube hostport portals */ ADDRTYPE match dst-type LOCAL
```
so if a service have same port with pod's hostport, then this service can't be access.

In this pr, we added `ACCESS` rule for traffic that aim to ipvs virtual service, to prevent those traffic from be blocked by other rules.

**Release note**:
```release-note
NONE
```
2018-04-27 19:50:45 -07:00
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