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host-local: return error if duplicate allocation is requested for a given ID

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Signed-off-by: Bruce Ma <brucema19901024@gmail.com>
This commit is contained in:
Bruce Ma
2019-07-06 10:05:18 +08:00
parent eb1ff18c4c
commit e2984e7840
2 changed files with 30 additions and 46 deletions
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44
plugins/ipam/host-local/backend/allocator/allocator.go
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@ -73,39 +73,35 @@ func (a *IPAllocator) Get(id string, ifname string, requestedIP net.IP) (*curren
gw = r.Gateway
} else {
// try to get existing IPs which have been allocated to this id
existIPs := a.store.GetByID(id, ifname)
for _, existIP := range existIPs {
// try to get allocated IPs for this given id, if exists, just return error
// because duplicate allocation is not allowed in SPEC
// https://github.com/containernetworking/cni/blob/master/SPEC.md
allocatedIPs := a.store.GetByID(id, ifname)
for _, allocatedIP := range allocatedIPs {
// check whether the existing IP belong to this range set
if r, err := a.rangeset.RangeFor(existIP); err == nil {
reservedIP = &net.IPNet{IP: existIP, Mask: r.Subnet.Mask}
gw = r.Gateway
break
if _, err := a.rangeset.RangeFor(allocatedIP); err == nil {
return nil, fmt.Errorf("%s has been allocated to %s, duplicate allocation is not allowed", allocatedIP.String(), id)
}
}
// if no existing IP was found, try to reserve a new one
if reservedIP == nil {
iter, err := a.GetIter()
iter, err := a.GetIter()
if err != nil {
return nil, err
}
for {
reservedIP, gw = iter.Next()
if reservedIP == nil {
break
}
reserved, err := a.store.Reserve(id, ifname, reservedIP.IP, a.rangeID)
if err != nil {
return nil, err
}
for {
reservedIP, gw = iter.Next()
if reservedIP == nil {
break
}
reserved, err := a.store.Reserve(id, ifname, reservedIP.IP, a.rangeID)
if err != nil {
return nil, err
}
if reserved {
break
}
if reserved {
break
}
}
}