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

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.pdf



Signed-off-by: default avatarPablo Neira Ayuso <pablo@netfilter.org>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent c047c3b1

drivers/net/Kconfig

+17 −0
Original line number Original line Diff line number Diff line
@@ -192,6 +192,23 @@ config GENEVE 
	  To compile this driver as a module, choose M here: the module

	  To compile this driver as a module, choose M here: the module

	  will be called geneve.

	  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

config MACSEC

	tristate "IEEE 802.1AE MAC-level encryption (MACsec)"

	tristate "IEEE 802.1AE MAC-level encryption (MACsec)"

	select CRYPTO

	select CRYPTO

drivers/net/Makefile

+1 −0
Original line number Original line Diff line number Diff line
@@ -25,6 +25,7 @@ obj-$(CONFIG_VETH) += veth.o 
obj-$(CONFIG_VIRTIO_NET) += virtio_net.o

obj-$(CONFIG_VIRTIO_NET) += virtio_net.o

obj-$(CONFIG_VXLAN) += vxlan.o

obj-$(CONFIG_VXLAN) += vxlan.o

obj-$(CONFIG_GENEVE) += geneve.o

obj-$(CONFIG_GENEVE) += geneve.o

obj-$(CONFIG_GTP) += gtp.o

obj-$(CONFIG_NLMON) += nlmon.o

obj-$(CONFIG_NLMON) += nlmon.o

obj-$(CONFIG_NET_VRF) += vrf.o

obj-$(CONFIG_NET_VRF) += vrf.o

drivers/net/gtp.c

0 → 100644
+1364 −0

File added.

Preview size limit exceeded, changes collapsed.

include/net/gtp.h

0 → 100644
+34 −0
Original line number Original line Diff line number Diff line 
#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

include/uapi/linux/Kbuild

+1 −0
Original line number Original line Diff line number Diff line
@@ -141,6 +141,7 @@ header-y += gfs2_ondisk.h 
header-y += gigaset_dev.h

header-y += gigaset_dev.h

header-y += gpio.h

header-y += gpio.h

header-y += gsmmux.h

header-y += gsmmux.h

header-y += gtp.h

header-y += hdlcdrv.h

header-y += hdlcdrv.h

header-y += hdlc.h

header-y += hdlc.h

header-y += hdreg.h

header-y += hdreg.h