path: root/drivers/net/gtp.c

// SPDX-License-Identifier: GPL-2.0-or-later
/* GTP according to GSM TS 09.60 / 3GPP TS 29.060
 *
 * (C) 2012-2014 by sysmocom - s.f.m.c. GmbH
 * (C) 2016 by Pablo Neira Ayuso <pablo@netfilter.org>
 *
 * Author: Harald Welte <hwelte@sysmocom.de>
 *	   Pablo Neira Ayuso <pablo@netfilter.org>
 *	   Andreas Schultz <aschultz@travelping.com>
 */

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/module.h>
#include <linux/skbuff.h>
#include <linux/udp.h>
#include <linux/rculist.h>
#include <linux/jhash.h>
#include <linux/if_tunnel.h>
#include <linux/net.h>
#include <linux/file.h>
#include <linux/gtp.h>

#include <net/net_namespace.h>
#include <net/protocol.h>
#include <net/ip.h>
#include <net/udp.h>
#include <net/udp_tunnel.h>
#include <net/icmp.h>
#include <net/xfrm.h>
#include <net/genetlink.h>
#include <net/netns/generic.h>
#include <net/gtp.h>

/* An active session for the subscriber. */
struct pdp_ctx {
	struct hlist_node	hlist_tid;
	struct hlist_node	hlist_addr;

	union {
		u64		tid;
		struct {
			u64	tid;
			u16	flow;
		} v0;
		struct {
			u32	i_tei;
			u32	o_tei;
		} v1;
	} u;
	u8			gtp_version;
	u16			af;

	struct in_addr		ms_addr_ip4;
	struct in_addr		peer_addr_ip4;

	struct sock		*sk;
	struct net_device       *dev;

	atomic_t		tx_seq;
	struct rcu_head		rcu_head;
};

/* One instance of the GTP device. */
struct gtp_dev {
	struct list_head	list;

	struct sock		*sk0;
	struct sock		*sk1u;

	struct net_device	*dev;

	unsigned int		role;
	unsigned int		hash_size;
	struct hlist_head	*tid_hash;
	struct hlist_head	*addr_hash;
};

static unsigned int gtp_net_id __read_mostly;

struct gtp_net {
	struct list_head gtp_dev_list;
};

static u32 gtp_h_initval;

static void pdp_context_delete(struct pdp_ctx *pctx);

static inline u32 gtp0_hashfn(u64 tid)
{
	u32 *tid32 = (u32 *) &tid;
	return jhash_2words(tid32[0], tid32[1], gtp_h_initval);
}

static inline u32 gtp1u_hashfn(u32 tid)
{
	return jhash