| // Copyright 2018 The gVisor Authors. |
| // |
| // Licensed under the Apache License, Version 2.0 (the "License"); |
| // you may not use this file except in compliance with the License. |
| // You may obtain a copy of the License at |
| // |
| // http://www.apache.org/licenses/LICENSE-2.0 |
| // |
| // Unless required by applicable law or agreed to in writing, software |
| // distributed under the License is distributed on an "AS IS" BASIS, |
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| // See the License for the specific language governing permissions and |
| // limitations under the License. |
| |
| package header |
| |
| import ( |
| "gvisor.dev/gvisor/pkg/tcpip" |
| ) |
| |
| const ( |
| // MaxIPPacketSize is the maximum supported IP packet size, excluding |
| // jumbograms. The maximum IPv4 packet size is 64k-1 (total size must fit |
| // in 16 bits). For IPv6, the payload max size (excluding jumbograms) is |
| // 64k-1 (also needs to fit in 16 bits). So we use 64k - 1 + 2 * m, where |
| // m is the minimum IPv6 header size; we leave room for some potential |
| // IP options. |
| MaxIPPacketSize = 0xffff + 2*IPv6MinimumSize |
| ) |
| |
| // Transport offers generic methods to query and/or update the fields of the |
| // header of a transport protocol buffer. |
| type Transport interface { |
| // SourcePort returns the value of the "source port" field. |
| SourcePort() uint16 |
| |
| // Destination returns the value of the "destination port" field. |
| DestinationPort() uint16 |
| |
| // Checksum returns the value of the "checksum" field. |
| Checksum() uint16 |
| |
| // SetSourcePort sets the value of the "source port" field. |
| SetSourcePort(uint16) |
| |
| // SetDestinationPort sets the value of the "destination port" field. |
| SetDestinationPort(uint16) |
| |
| // SetChecksum sets the value of the "checksum" field. |
| SetChecksum(uint16) |
| |
| // Payload returns the data carried in the transport buffer. |
| Payload() []byte |
| } |
| |
| // Network offers generic methods to query and/or update the fields of the |
| // header of a network protocol buffer. |
| type Network interface { |
| // SourceAddress returns the value of the "source address" field. |
| SourceAddress() tcpip.Address |
| |
| // DestinationAddress returns the value of the "destination address" |
| // field. |
| DestinationAddress() tcpip.Address |
| |
| // Checksum returns the value of the "checksum" field. |
| Checksum() uint16 |
| |
| // SetSourceAddress sets the value of the "source address" field. |
| SetSourceAddress(tcpip.Address) |
| |
| // SetDestinationAddress sets the value of the "destination address" |
| // field. |
| SetDestinationAddress(tcpip.Address) |
| |
| // SetChecksum sets the value of the "checksum" field. |
| SetChecksum(uint16) |
| |
| // TransportProtocol returns the number of the transport protocol |
| // stored in the payload. |
| TransportProtocol() tcpip.TransportProtocolNumber |
| |
| // Payload returns a byte slice containing the payload of the network |
| // packet. |
| Payload() []byte |
| |
| // TOS returns the values of the "type of service" and "flow label" fields. |
| TOS() (uint8, uint32) |
| |
| // SetTOS sets the values of the "type of service" and "flow label" fields. |
| SetTOS(t uint8, l uint32) |
| } |