move packet/*.go to packet/bgp/*.go for Go's convention

Later, we move non-bgp protocol stuff like mrt under their own
direcotries.

Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>

1 files changed, 0 insertions, 221 deletions

diff --git a/packet/validate.go b/packet/validate.go
deleted file mode 100644
index 73697c4d..00000000
--- a/packet/validate.go
+++ /dev/null
@@ -1,221 +0,0 @@
-package bgp
-
-import (
-	"encoding/binary"
-	"fmt"
-	"net"
-	"strconv"
-)
-
-// Validator for BGPUpdate
-func ValidateUpdateMsg(m *BGPUpdate, rfs map[RouteFamily]bool, doConfedCheck bool) (bool, error) {
-	eCode := uint8(BGP_ERROR_UPDATE_MESSAGE_ERROR)
-	eSubCodeAttrList := uint8(BGP_ERROR_SUB_MALFORMED_ATTRIBUTE_LIST)
-	eSubCodeMissing := uint8(BGP_ERROR_SUB_MISSING_WELL_KNOWN_ATTRIBUTE)
-
-	if len(m.NLRI) > 0 || len(m.WithdrawnRoutes) > 0 {
-		if _, ok := rfs[RF_IPv4_UC]; !ok {
-			return false, NewMessageError(0, 0, nil, fmt.Sprintf("Address-family rf %d not avalible for session", RF_IPv4_UC))
-		}
-	}
-
-	seen := make(map[BGPAttrType]PathAttributeInterface)
-	// check path attribute
-	for _, a := range m.PathAttributes {
-		// check duplication
-		if _, ok := seen[a.GetType()]; !ok {
-			seen[a.GetType()] = a
-		} else {
-			eMsg := "the path attribute apears twice. Type : " + strconv.Itoa(int(a.GetType()))
-			return false, NewMessageError(eCode, eSubCodeAttrList, nil, eMsg)
-		}
-
-		//check specific path attribute
-		ok, e := ValidateAttribute(a, rfs, doConfedCheck)
-		if !ok {
-			return false, e
-		}
-	}
-
-	if len(m.NLRI) > 0 {
-		// check the existence of well-known mandatory attributes
-		exist := func(attrs []BGPAttrType) (bool, BGPAttrType) {
-			for _, attr := range attrs {
-				_, ok := seen[attr]
-				if !ok {
-					return false, attr
-				}
-			}
-			return true, 0
-		}
-		mandatory := []BGPAttrType{BGP_ATTR_TYPE_ORIGIN, BGP_ATTR_TYPE_AS_PATH, BGP_ATTR_TYPE_NEXT_HOP}
-		if ok, t := exist(mandatory); !ok {
-			eMsg := "well-known mandatory attributes are not present. type : " + strconv.Itoa(int(t))
-			data := []byte{byte(t)}
-			return false, NewMessageError(eCode, eSubCodeMissing, data, eMsg)
-		}
-	}
-	return true, nil
-}
-
-func ValidateAttribute(a PathAttributeInterface, rfs map[RouteFamily]bool, doConfedCheck bool) (bool, error) {
-
-	eCode := uint8(BGP_ERROR_UPDATE_MESSAGE_ERROR)
-	eSubCodeBadOrigin := uint8(BGP_ERROR_SUB_INVALID_ORIGIN_ATTRIBUTE)
-	eSubCodeBadNextHop := uint8(BGP_ERROR_SUB_INVALID_NEXT_HOP_ATTRIBUTE)
-	eSubCodeUnknown := uint8(BGP_ERROR_SUB_UNRECOGNIZED_WELL_KNOWN_ATTRIBUTE)
-	eSubCodeMalformedAspath := uint8(BGP_ERROR_SUB_MALFORMED_AS_PATH)
-
-	checkPrefix := func(l []AddrPrefixInterface) bool {
-		for _, prefix := range l {
-			rf := AfiSafiToRouteFamily(prefix.AFI(), prefix.SAFI())
-			if _, ok := rfs[rf]; !ok {
-				return false
-			}
-		}
-		return true
-	}
-
-	switch p := a.(type) {
-	case *PathAttributeMpUnreachNLRI:
-		rf := AfiSafiToRouteFamily(p.AFI, p.SAFI)
-		if _, ok := rfs[rf]; !ok {
-			return false, NewMessageError(0, 0, nil, fmt.Sprintf("Address-family rf %d not avalible for session", rf))
-		}
-		if checkPrefix(p.Value) == false {
-			return false, NewMessageError(0, 0, nil, fmt.Sprintf("Address-family rf %d not avalible for session", rf))
-		}
-	case *PathAttributeMpReachNLRI:
-		rf := AfiSafiToRouteFamily(p.AFI, p.SAFI)
-		if _, ok := rfs[rf]; !ok {
-			return false, NewMessageError(0, 0, nil, fmt.Sprintf("Address-family rf %d not avalible for session", rf))
-		}
-		if checkPrefix(p.Value) == false {
-			return false, NewMessageError(0, 0, nil, fmt.Sprintf("Address-family rf %d not avalible for session", rf))
-		}
-	case *PathAttributeOrigin:
-		v := uint8(p.Value[0])
-		if v != BGP_ORIGIN_ATTR_TYPE_IGP &&
-			v != BGP_ORIGIN_ATTR_TYPE_EGP &&
-			v != BGP_ORIGIN_ATTR_TYPE_INCOMPLETE {
-			data, _ := a.Serialize()
-			eMsg := "invalid origin attribute. value : " + strconv.Itoa(int(v))
-			return false, NewMessageError(eCode, eSubCodeBadOrigin, data, eMsg)
-		}
-	case *PathAttributeNextHop:
-
-		isZero := func(ip net.IP) bool {
-			res := ip[0] & 0xff
-			return res == 0x00
-		}
-
-		isClassDorE := func(ip net.IP) bool {
-			res := ip[0] & 0xe0
-			return res == 0xe0
-		}
-
-		//check IP address represents host address
-		if p.Value.IsLoopback() || isZero(p.Value) || isClassDorE(p.Value) {
-			eMsg := "invalid nexthop address"
-			data, _ := a.Serialize()
-			return false, NewMessageError(eCode, eSubCodeBadNextHop, data, eMsg)
-		}
-	case *PathAttributeAsPath:
-		if doConfedCheck {
-			for _, paramIf := range p.Value {
-				var segType uint8
-				asParam, y := paramIf.(*As4PathParam)
-				if y {
-					segType = asParam.Type
-				} else {
-					segType = paramIf.(*AsPathParam).Type
-				}
-
-				if segType == BGP_ASPATH_ATTR_TYPE_CONFED_SET || segType == BGP_ASPATH_ATTR_TYPE_CONFED_SEQ {
-					return false, NewMessageError(eCode, eSubCodeMalformedAspath, nil, fmt.Sprintf("segment type confederation(%d) found", segType))
-				}
-			}
-		}
-
-	case *PathAttributeUnknown:
-		if p.getFlags()&BGP_ATTR_FLAG_OPTIONAL == 0 {
-			eMsg := fmt.Sprintf("unrecognized well-known attribute %s", p.GetType())
-			data, _ := a.Serialize()
-			return false, NewMessageError(eCode, eSubCodeUnknown, data, eMsg)
-		}
-	}
-
-	return true, nil
-
-}
-
-// validator for PathAttribute
-func ValidateFlags(t BGPAttrType, flags BGPAttrFlag) (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 := fmt.Sprintf("well-known attribute %s must have transitive flag 1", t)
-		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 := fmt.Sprintf("well-known attribute %s must have partial bit 0", t)
-		return false, eMsg
-	}
-	if flags&BGP_ATTR_FLAG_OPTIONAL != 0 && flags&BGP_ATTR_FLAG_TRANSITIVE == 0 && flags&BGP_ATTR_FLAG_PARTIAL != 0 {
-		eMsg := fmt.Sprintf("optional non-transitive attribute %s must have partial bit 0", t)
-		return false, eMsg
-	}
-
-	// check flags are correct
-	if f, ok := pathAttrFlags[t]; ok {
-		if f != flags & ^BGP_ATTR_FLAG_EXTENDED_LENGTH & ^BGP_ATTR_FLAG_PARTIAL {
-			eMsg := fmt.Sprintf("flags are invalid. attribute type: %s, expect: %s, actual: %s", t, f, flags)
-			return false, eMsg
-		}
-	}
-	return true, ""
-}
-
-func ValidateBGPMessage(m *BGPMessage) error {
-	if m.Header.Len > BGP_MAX_MESSAGE_LENGTH {
-		buf := make([]byte, 2)
-		binary.BigEndian.PutUint16(buf, m.Header.Len)
-		return NewMessageError(BGP_ERROR_MESSAGE_HEADER_ERROR, BGP_ERROR_SUB_BAD_MESSAGE_LENGTH, buf, "too long length")
-	}
-
-	return nil
-}
-
-func ValidateOpenMsg(m *BGPOpen, expectedAS uint32) error {
-	if m.Version != 4 {
-		return NewMessageError(BGP_ERROR_OPEN_MESSAGE_ERROR, BGP_ERROR_SUB_UNSUPPORTED_VERSION_NUMBER, nil, fmt.Sprintf("upsuppored version %d", m.Version))
-	}
-
-	as := uint32(m.MyAS)
-	for _, p := range m.OptParams {
-		paramCap, y := p.(*OptionParameterCapability)
-		if !y {
-			continue
-		}
-		for _, c := range paramCap.Capability {
-			if c.Code() == BGP_CAP_FOUR_OCTET_AS_NUMBER {
-				cap := c.(*CapFourOctetASNumber)
-				as = cap.CapValue
-			}
-		}
-	}
-	if as != expectedAS {
-		return NewMessageError(BGP_ERROR_OPEN_MESSAGE_ERROR, BGP_ERROR_SUB_BAD_PEER_AS, nil, fmt.Sprintf("as number mismatch expected %d, received %d", expectedAS, as))
-	}
-
-	if m.HoldTime < 3 && m.HoldTime != 0 {
-		return NewMessageError(BGP_ERROR_OPEN_MESSAGE_ERROR, BGP_ERROR_SUB_UNACCEPTABLE_HOLD_TIME, nil, fmt.Sprintf("unacceptable hold time %d", m.HoldTime))
-	}
-	return nil
-}