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package bgp
import (
"strconv"
)
// validator for PathAttribute
func ValidateFlags(t BGPAttrType, flags uint8) (bool, string) {
/*
* RFC 4271 P.17 For well-known attributes, the Transitive bit MUST be set to 1.
*/
if flags&BGP_ATTR_FLAG_OPTIONAL == 0 && flags&BGP_ATTR_FLAG_TRANSITIVE == 0 {
eMsg := "well-known attribute must have transitive flag 1"
return false, eMsg
}
/*
* RFC 4271 P.17 For well-known attributes and for optional non-transitive attributes,
* the Partial bit MUST be set to 0.
*/
if flags&BGP_ATTR_FLAG_OPTIONAL == 0 && flags&BGP_ATTR_FLAG_PARTIAL != 0 {
eMsg := "well-known attribute must have partial bit 0"
return false, eMsg
}
if flags&BGP_ATTR_FLAG_OPTIONAL != 0 && flags&BGP_ATTR_FLAG_TRANSITIVE == 0 && flags&BGP_ATTR_FLAG_PARTIAL != 0 {
eMsg := "optional non-transitive attribute must have partial bit 0"
return false, eMsg
}
// check flags are correct
if f, ok := pathAttrFlags[t]; ok {
if f != flags {
eMsg := "flags are invalid. attribtue type : " + strconv.Itoa(int(t))
return false, eMsg
}
}
return true, ""
}
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