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filter.go
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filter.go
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package netlink
import (
"fmt"
)
type Filter interface {
Attrs() *FilterAttrs
Type() string
}
// Filter represents a netlink filter. A filter is associated with a link,
// has a handle and a parent. The root filter of a device should have a
// parent == HANDLE_ROOT.
type FilterAttrs struct {
LinkIndex int
Handle uint32
Parent uint32
Priority uint16 // lower is higher priority
Protocol uint16 // syscall.ETH_P_*
}
func (q FilterAttrs) String() string {
return fmt.Sprintf("{LinkIndex: %d, Handle: %s, Parent: %s, Priority: %d, Protocol: %d}", q.LinkIndex, HandleStr(q.Handle), HandleStr(q.Parent), q.Priority, q.Protocol)
}
// U32 filters on many packet related properties
type U32 struct {
FilterAttrs
// Currently only supports redirecting to another interface
RedirIndex int
}
func (filter *U32) Attrs() *FilterAttrs {
return &filter.FilterAttrs
}
func (filter *U32) Type() string {
return "u32"
}
// GenericFilter filters represent types that are not currently understood
// by this netlink library.
type GenericFilter struct {
FilterAttrs
FilterType string
}
func (filter *GenericFilter) Attrs() *FilterAttrs {
return &filter.FilterAttrs
}
func (filter *GenericFilter) Type() string {
return filter.FilterType
}