Commit 459aa660 authored by Pablo Neira's avatar Pablo Neira Committed by David S. Miller

gtp: add initial driver for datapath of GPRS Tunneling Protocol (GTP-U)

This is an initial implementation of a netdev driver for GTP datapath
(GTP-U) v0 and v1, according to the GSM TS 09.60 and 3GPP TS 29.060
standards. This tunneling protocol is used to prevent subscribers from
accessing mobile carrier core network infrastructure.

This implementation requires a GGSN userspace daemon that implements the
signaling protocol (GTP-C), such as OpenGGSN [1]. This userspace daemon
updates the PDP context database that represents active subscriber
sessions through a genetlink interface.

For more context on this tunneling protocol, you can check the slides
that were presented during the NetDev 1.1 [2].

Only IPv4 is supported at this time.

[1] http://git.osmocom.org/openggsn/
[2] http://www.netdevconf.org/1.1/proceedings/slides/schultz-welte-osmocom-gtp.pdfSigned-off-by: default avatarPablo Neira Ayuso <pablo@netfilter.org>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent c047c3b1
......@@ -192,6 +192,23 @@ config GENEVE
To compile this driver as a module, choose M here: the module
will be called geneve.
config GTP
tristate "GPRS Tunneling Protocol datapath (GTP-U)"
depends on INET && NET_UDP_TUNNEL
select NET_IP_TUNNEL
---help---
This allows one to create gtp virtual interfaces that provide
the GPRS Tunneling Protocol datapath (GTP-U). This tunneling protocol
is used to prevent subscribers from accessing mobile carrier core
network infrastructure. This driver requires a userspace software that
implements the signaling protocol (GTP-C) to update its PDP context
base, such as OpenGGSN <http://git.osmocom.org/openggsn/). This
tunneling protocol is implemented according to the GSM TS 09.60 and
3GPP TS 29.060 standards.
To compile this drivers as a module, choose M here: the module
wil be called gtp.
config MACSEC
tristate "IEEE 802.1AE MAC-level encryption (MACsec)"
select CRYPTO
......
......@@ -25,6 +25,7 @@ obj-$(CONFIG_VETH) += veth.o
obj-$(CONFIG_VIRTIO_NET) += virtio_net.o
obj-$(CONFIG_VXLAN) += vxlan.o
obj-$(CONFIG_GENEVE) += geneve.o
obj-$(CONFIG_GTP) += gtp.o
obj-$(CONFIG_NLMON) += nlmon.o
obj-$(CONFIG_NET_VRF) += vrf.o
......
This diff is collapsed.
#ifndef _GTP_H_
#define _GTP_H
/* General GTP protocol related definitions. */
#define GTP0_PORT 3386
#define GTP1U_PORT 2152
#define GTP_TPDU 255
struct gtp0_header { /* According to GSM TS 09.60. */
__u8 flags;
__u8 type;
__be16 length;
__be16 seq;
__be16 flow;
__u8 number;
__u8 spare[3];
__be64 tid;
} __attribute__ ((packed));
struct gtp1_header { /* According to 3GPP TS 29.060. */
__u8 flags;
__u8 type;
__be16 length;
__be32 tid;
} __attribute__ ((packed));
#define GTP1_F_NPDU 0x01
#define GTP1_F_SEQ 0x02
#define GTP1_F_EXTHDR 0x04
#define GTP1_F_MASK 0x07
#endif
......@@ -141,6 +141,7 @@ header-y += gfs2_ondisk.h
header-y += gigaset_dev.h
header-y += gpio.h
header-y += gsmmux.h
header-y += gtp.h
header-y += hdlcdrv.h
header-y += hdlc.h
header-y += hdreg.h
......
#ifndef _UAPI_LINUX_GTP_H_
#define _UAPI_LINUX_GTP_H__
enum gtp_genl_cmds {
GTP_CMD_NEWPDP,
GTP_CMD_DELPDP,
GTP_CMD_GETPDP,
GTP_CMD_MAX,
};
enum gtp_version {
GTP_V0 = 0,
GTP_V1,
};
enum gtp_attrs {
GTPA_UNSPEC = 0,
GTPA_LINK,
GTPA_VERSION,
GTPA_TID, /* for GTPv0 only */
GTPA_SGSN_ADDRESS,
GTPA_MS_ADDRESS,
GTPA_FLOW,
GTPA_NET_NS_FD,
GTPA_I_TEI, /* for GTPv1 only */
GTPA_O_TEI, /* for GTPv1 only */
GTPA_PAD,
__GTPA_MAX,
};
#define GTPA_MAX (__GTPA_MAX + 1)
#endif /* _UAPI_LINUX_GTP_H_ */
......@@ -529,6 +529,16 @@ enum {
};
#define IFLA_PPP_MAX (__IFLA_PPP_MAX - 1)
/* GTP section */
enum {
IFLA_GTP_UNSPEC,
IFLA_GTP_FD0,
IFLA_GTP_FD1,
IFLA_GTP_PDP_HASHSIZE,
__IFLA_GTP_MAX,
};
#define IFLA_GTP_MAX (__IFLA_GTP_MAX - 1)
/* Bonding section */
enum {
......
......@@ -36,6 +36,7 @@ struct udphdr {
#define UDP_ENCAP_ESPINUDP_NON_IKE 1 /* draft-ietf-ipsec-nat-t-ike-00/01 */
#define UDP_ENCAP_ESPINUDP 2 /* draft-ietf-ipsec-udp-encaps-06 */
#define UDP_ENCAP_L2TPINUDP 3 /* rfc2661 */
#define UDP_ENCAP_GTP0 4 /* GSM TS 09.60 */
#define UDP_ENCAP_GTP1U 5 /* 3GPP TS 29.060 */
#endif /* _UAPI_LINUX_UDP_H */
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