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https://github.com/openvswitch/ovs
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GTP, GPRS Tunneling Protocol, is a group of IP-based communications protocols used to carry general packet radio service (GPRS) within GSM, UMTS and LTE networks. GTP protocol has two parts: Signalling (GTP-Control, GTP-C) and User data (GTP-User, GTP-U). GTP-C is used for setting up GTP-U protocol, which is an IP-in-UDP tunneling protocol. Usually GTP is used in connecting between base station for radio, Serving Gateway (S-GW), and PDN Gateway (P-GW). This patch implements GTP-U protocol for userspace datapath, supporting only required header fields and G-PDU message type. See spec in: https://tools.ietf.org/html/draft-hmm-dmm-5g-uplane-analysis-00 Tested-at: https://travis-ci.org/github/williamtu/ovs-travis/builds/666518784 Signed-off-by: Feng Yang <yangfengee04@gmail.com> Co-authored-by: Feng Yang <yangfengee04@gmail.com> Signed-off-by: Yi Yang <yangyi01@inspur.com> Co-authored-by: Yi Yang <yangyi01@inspur.com> Signed-off-by: William Tu <u9012063@gmail.com> Acked-by: Ben Pfaff <blp@ovn.org>
103 lines
2.4 KiB
C
103 lines
2.4 KiB
C
/*
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* Copyright (c) 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015 Nicira, Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at:
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef OPENVSWITCH_PACKETS_H
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#define OPENVSWITCH_PACKETS_H 1
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#include <sys/types.h>
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#include <netinet/in.h>
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#include "openvswitch/tun-metadata.h"
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#ifdef __cplusplus
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extern "C" {
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#endif
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/* Tunnel information used in flow key and metadata. */
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struct flow_tnl {
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ovs_be32 ip_dst;
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struct in6_addr ipv6_dst;
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ovs_be32 ip_src;
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struct in6_addr ipv6_src;
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ovs_be64 tun_id;
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uint16_t flags;
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uint8_t ip_tos;
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uint8_t ip_ttl;
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ovs_be16 tp_src;
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ovs_be16 tp_dst;
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ovs_be16 gbp_id;
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uint8_t gbp_flags;
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uint8_t erspan_ver;
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uint32_t erspan_idx;
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uint8_t erspan_dir;
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uint8_t erspan_hwid;
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uint8_t gtpu_flags;
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uint8_t gtpu_msgtype;
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uint8_t pad1[4]; /* Pad to 64 bits. */
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struct tun_metadata metadata;
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};
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/* Some flags are exposed through OpenFlow while others are used only
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* internally. */
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/* Public flags */
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#define FLOW_TNL_F_OAM (1 << 0)
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#define FLOW_TNL_PUB_F_MASK ((1 << 1) - 1)
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/* Private flags */
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#define FLOW_TNL_F_DONT_FRAGMENT (1 << 1)
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#define FLOW_TNL_F_CSUM (1 << 2)
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#define FLOW_TNL_F_KEY (1 << 3)
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#define FLOW_TNL_F_MASK ((1 << 4) - 1)
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/* Unfortunately, a "struct flow" sometimes has to handle OpenFlow port
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* numbers and other times datapath (dpif) port numbers. This union allows
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* access to both. */
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union flow_in_port {
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odp_port_t odp_port;
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ofp_port_t ofp_port;
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};
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union flow_vlan_hdr {
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ovs_be32 qtag;
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struct {
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ovs_be16 tpid; /* ETH_TYPE_VLAN_DOT1Q or ETH_TYPE_DOT1AD */
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ovs_be16 tci;
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};
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};
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struct ovs_key_nsh {
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uint8_t flags;
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uint8_t ttl;
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uint8_t mdtype;
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uint8_t np;
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ovs_be32 path_hdr;
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ovs_be32 context[4];
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};
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/* NSH flags */
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#define FLOW_NSH_F_OAM (1 << 0)
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#define FLOW_NSH_F_CTX (1 << 1)
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#define FLOW_NSH_F_MASK ((1 << 2) - 1)
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#ifdef __cplusplus
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}
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#endif
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#endif /* packets.h */
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