gtp.c 31 KB
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/* 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>
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version
 * 2 of the License, or (at your option) any later version.
 */

#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;
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	struct in_addr		peer_addr_ip4;
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	struct sock		*sk;
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	struct net_device       *dev;

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	atomic_t		tx_seq;
	struct rcu_head		rcu_head;
};

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

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	struct sock		*sk0;
	struct sock		*sk1u;
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	struct net_device	*dev;

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

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static unsigned int gtp_net_id __read_mostly;
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struct gtp_net {
	struct list_head gtp_dev_list;
};

static u32 gtp_h_initval;

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static void pdp_context_delete(struct pdp_ctx *pctx);

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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_1word(tid, gtp_h_initval);
}

static inline u32 ipv4_hashfn(__be32 ip)
{
	return jhash_1word((__force u32)ip, gtp_h_initval);
}

/* Resolve a PDP context structure based on the 64bit TID. */
static struct pdp_ctx *gtp0_pdp_find(struct gtp_dev *gtp, u64 tid)
{
	struct hlist_head *head;
	struct pdp_ctx *pdp;

	head = &gtp->tid_hash[gtp0_hashfn(tid) % gtp->hash_size];

	hlist_for_each_entry_rcu(pdp, head, hlist_tid) {
		if (pdp->gtp_version == GTP_V0 &&
		    pdp->u.v0.tid == tid)
			return pdp;
	}
	return NULL;
}

/* Resolve a PDP context structure based on the 32bit TEI. */
static struct pdp_ctx *gtp1_pdp_find(struct gtp_dev *gtp, u32 tid)
{
	struct hlist_head *head;
	struct pdp_ctx *pdp;

	head = &gtp->tid_hash[gtp1u_hashfn(tid) % gtp->hash_size];

	hlist_for_each_entry_rcu(pdp, head, hlist_tid) {
		if (pdp->gtp_version == GTP_V1 &&
		    pdp->u.v1.i_tei == tid)
			return pdp;
	}
	return NULL;
}

/* Resolve a PDP context based on IPv4 address of MS. */
static struct pdp_ctx *ipv4_pdp_find(struct gtp_dev *gtp, __be32 ms_addr)
{
	struct hlist_head *head;
	struct pdp_ctx *pdp;

	head = &gtp->addr_hash[ipv4_hashfn(ms_addr) % gtp->hash_size];

	hlist_for_each_entry_rcu(pdp, head, hlist_addr) {
		if (pdp->af == AF_INET &&
		    pdp->ms_addr_ip4.s_addr == ms_addr)
			return pdp;
	}

	return NULL;
}

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static bool gtp_check_ms_ipv4(struct sk_buff *skb, struct pdp_ctx *pctx,
				  unsigned int hdrlen, unsigned int role)
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{
	struct iphdr *iph;

	if (!pskb_may_pull(skb, hdrlen + sizeof(struct iphdr)))
		return false;

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	iph = (struct iphdr *)(skb->data + hdrlen);
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	if (role == GTP_ROLE_SGSN)
		return iph->daddr == pctx->ms_addr_ip4.s_addr;
	else
		return iph->saddr == pctx->ms_addr_ip4.s_addr;
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}

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/* Check if the inner IP address in this packet is assigned to any
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 * existing mobile subscriber.
 */
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static bool gtp_check_ms(struct sk_buff *skb, struct pdp_ctx *pctx,
			     unsigned int hdrlen, unsigned int role)
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{
	switch (ntohs(skb->protocol)) {
	case ETH_P_IP:
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		return gtp_check_ms_ipv4(skb, pctx, hdrlen, role);
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	}
	return false;
}

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static int gtp_rx(struct pdp_ctx *pctx, struct sk_buff *skb,
			unsigned int hdrlen, unsigned int role)
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{
	struct pcpu_sw_netstats *stats;

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	if (!gtp_check_ms(skb, pctx, hdrlen, role)) {
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		netdev_dbg(pctx->dev, "No PDP ctx for this MS\n");
		return 1;
	}

	/* Get rid of the GTP + UDP headers. */
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	if (iptunnel_pull_header(skb, hdrlen, skb->protocol,
				 !net_eq(sock_net(pctx->sk), dev_net(pctx->dev))))
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		return -1;

	netdev_dbg(pctx->dev, "forwarding packet from GGSN to uplink\n");

	/* Now that the UDP and the GTP header have been removed, set up the
	 * new network header. This is required by the upper layer to
	 * calculate the transport header.
	 */
	skb_reset_network_header(skb);

	skb->dev = pctx->dev;

	stats = this_cpu_ptr(pctx->dev->tstats);
	u64_stats_update_begin(&stats->syncp);
	stats->rx_packets++;
	stats->rx_bytes += skb->len;
	u64_stats_update_end(&stats->syncp);

	netif_rx(skb);
	return 0;
}

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/* 1 means pass up to the stack, -1 means drop and 0 means decapsulated. */
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static int gtp0_udp_encap_recv(struct gtp_dev *gtp, struct sk_buff *skb)
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{
	unsigned int hdrlen = sizeof(struct udphdr) +
			      sizeof(struct gtp0_header);
	struct gtp0_header *gtp0;
	struct pdp_ctx *pctx;

	if (!pskb_may_pull(skb, hdrlen))
		return -1;

	gtp0 = (struct gtp0_header *)(skb->data + sizeof(struct udphdr));

	if ((gtp0->flags >> 5) != GTP_V0)
		return 1;

	if (gtp0->type != GTP_TPDU)
		return 1;

	pctx = gtp0_pdp_find(gtp, be64_to_cpu(gtp0->tid));
	if (!pctx) {
		netdev_dbg(gtp->dev, "No PDP ctx to decap skb=%p\n", skb);
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		return 1;
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	}

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	return gtp_rx(pctx, skb, hdrlen, gtp->role);
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}

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static int gtp1u_udp_encap_recv(struct gtp_dev *gtp, struct sk_buff *skb)
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{
	unsigned int hdrlen = sizeof(struct udphdr) +
			      sizeof(struct gtp1_header);
	struct gtp1_header *gtp1;
	struct pdp_ctx *pctx;

	if (!pskb_may_pull(skb, hdrlen))
		return -1;

	gtp1 = (struct gtp1_header *)(skb->data + sizeof(struct udphdr));

	if ((gtp1->flags >> 5) != GTP_V1)
		return 1;

	if (gtp1->type != GTP_TPDU)
		return 1;

	/* From 29.060: "This field shall be present if and only if any one or
	 * more of the S, PN and E flags are set.".
	 *
	 * If any of the bit is set, then the remaining ones also have to be
	 * set.
	 */
	if (gtp1->flags & GTP1_F_MASK)
		hdrlen += 4;

	/* Make sure the header is larger enough, including extensions. */
	if (!pskb_may_pull(skb, hdrlen))
		return -1;

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	gtp1 = (struct gtp1_header *)(skb->data + sizeof(struct udphdr));

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	pctx = gtp1_pdp_find(gtp, ntohl(gtp1->tid));
	if (!pctx) {
		netdev_dbg(gtp->dev, "No PDP ctx to decap skb=%p\n", skb);
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		return 1;
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	}

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	return gtp_rx(pctx, skb, hdrlen, gtp->role);
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}

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static void gtp_encap_destroy(struct sock *sk)
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{
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	struct gtp_dev *gtp;
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	gtp = rcu_dereference_sk_user_data(sk);
	if (gtp) {
		udp_sk(sk)->encap_type = 0;
		rcu_assign_sk_user_data(sk, NULL);
		sock_put(sk);
	}
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}

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static void gtp_encap_disable_sock(struct sock *sk)
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{
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	if (!sk)
		return;
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	gtp_encap_destroy(sk);
}

static void gtp_encap_disable(struct gtp_dev *gtp)
{
	gtp_encap_disable_sock(gtp->sk0);
	gtp_encap_disable_sock(gtp->sk1u);
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}

/* UDP encapsulation receive handler. See net/ipv4/udp.c.
 * Return codes: 0: success, <0: error, >0: pass up to userspace UDP socket.
 */
static int gtp_encap_recv(struct sock *sk, struct sk_buff *skb)
{
	struct gtp_dev *gtp;
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	int ret = 0;
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	gtp = rcu_dereference_sk_user_data(sk);
	if (!gtp)
		return 1;

	netdev_dbg(gtp->dev, "encap_recv sk=%p\n", sk);

	switch (udp_sk(sk)->encap_type) {
	case UDP_ENCAP_GTP0:
		netdev_dbg(gtp->dev, "received GTP0 packet\n");
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		ret = gtp0_udp_encap_recv(gtp, skb);
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		break;
	case UDP_ENCAP_GTP1U:
		netdev_dbg(gtp->dev, "received GTP1U packet\n");
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		ret = gtp1u_udp_encap_recv(gtp, skb);
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		break;
	default:
		ret = -1; /* Shouldn't happen. */
	}

	switch (ret) {
	case 1:
		netdev_dbg(gtp->dev, "pass up to the process\n");
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		break;
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	case 0:
		break;
	case -1:
		netdev_dbg(gtp->dev, "GTP packet has been dropped\n");
		kfree_skb(skb);
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		ret = 0;
		break;
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	}

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	return ret;
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}

static int gtp_dev_init(struct net_device *dev)
{
	struct gtp_dev *gtp = netdev_priv(dev);

	gtp->dev = dev;

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	dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
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	if (!dev->tstats)
		return -ENOMEM;

	return 0;
}

static void gtp_dev_uninit(struct net_device *dev)
{
	struct gtp_dev *gtp = netdev_priv(dev);

	gtp_encap_disable(gtp);
	free_percpu(dev->tstats);
}

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static struct rtable *ip4_route_output_gtp(struct flowi4 *fl4,
					   const struct sock *sk,
					   __be32 daddr)
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{
	memset(fl4, 0, sizeof(*fl4));
	fl4->flowi4_oif		= sk->sk_bound_dev_if;
	fl4->daddr		= daddr;
	fl4->saddr		= inet_sk(sk)->inet_saddr;
	fl4->flowi4_tos		= RT_CONN_FLAGS(sk);
	fl4->flowi4_proto	= sk->sk_protocol;

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	return ip_route_output_key(sock_net(sk), fl4);
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}

static inline void gtp0_push_header(struct sk_buff *skb, struct pdp_ctx *pctx)
{
	int payload_len = skb->len;
	struct gtp0_header *gtp0;

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	gtp0 = skb_push(skb, sizeof(*gtp0));
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	gtp0->flags	= 0x1e; /* v0, GTP-non-prime. */
	gtp0->type	= GTP_TPDU;
	gtp0->length	= htons(payload_len);
	gtp0->seq	= htons((atomic_inc_return(&pctx->tx_seq) - 1) % 0xffff);
	gtp0->flow	= htons(pctx->u.v0.flow);
	gtp0->number	= 0xff;
	gtp0->spare[0]	= gtp0->spare[1] = gtp0->spare[2] = 0xff;
	gtp0->tid	= cpu_to_be64(pctx->u.v0.tid);
}

static inline void gtp1_push_header(struct sk_buff *skb, struct pdp_ctx *pctx)
{
	int payload_len = skb->len;
	struct gtp1_header *gtp1;

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	gtp1 = skb_push(skb, sizeof(*gtp1));
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	/* Bits    8  7  6  5  4  3  2	1
	 *	  +--+--+--+--+--+--+--+--+
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	 *	  |version |PT| 0| E| S|PN|
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	 *	  +--+--+--+--+--+--+--+--+
	 *	    0  0  1  1	1  0  0  0
	 */
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	gtp1->flags	= 0x30; /* v1, GTP-non-prime. */
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	gtp1->type	= GTP_TPDU;
	gtp1->length	= htons(payload_len);
	gtp1->tid	= htonl(pctx->u.v1.o_tei);

	/* TODO: Suppport for extension header, sequence number and N-PDU.
	 *	 Update the length field if any of them is available.
	 */
}

struct gtp_pktinfo {
	struct sock		*sk;
	struct iphdr		*iph;
	struct flowi4		fl4;
	struct rtable		*rt;
	struct pdp_ctx		*pctx;
	struct net_device	*dev;
	__be16			gtph_port;
};

static void gtp_push_header(struct sk_buff *skb, struct gtp_pktinfo *pktinfo)
{
	switch (pktinfo->pctx->gtp_version) {
	case GTP_V0:
		pktinfo->gtph_port = htons(GTP0_PORT);
		gtp0_push_header(skb, pktinfo->pctx);
		break;
	case GTP_V1:
		pktinfo->gtph_port = htons(GTP1U_PORT);
		gtp1_push_header(skb, pktinfo->pctx);
		break;
	}
}

static inline void gtp_set_pktinfo_ipv4(struct gtp_pktinfo *pktinfo,
					struct sock *sk, struct iphdr *iph,
					struct pdp_ctx *pctx, struct rtable *rt,
					struct flowi4 *fl4,
					struct net_device *dev)
{
	pktinfo->sk	= sk;
	pktinfo->iph	= iph;
	pktinfo->pctx	= pctx;
	pktinfo->rt	= rt;
	pktinfo->fl4	= *fl4;
	pktinfo->dev	= dev;
}

static int gtp_build_skb_ip4(struct sk_buff *skb, struct net_device *dev,
			     struct gtp_pktinfo *pktinfo)
{
	struct gtp_dev *gtp = netdev_priv(dev);
	struct pdp_ctx *pctx;
	struct rtable *rt;
	struct flowi4 fl4;
	struct iphdr *iph;
	__be16 df;
	int mtu;

	/* Read the IP destination address and resolve the PDP context.
	 * Prepend PDP header with TEI/TID from PDP ctx.
	 */
	iph = ip_hdr(skb);
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	if (gtp->role == GTP_ROLE_SGSN)
		pctx = ipv4_pdp_find(gtp, iph->saddr);
	else
		pctx = ipv4_pdp_find(gtp, iph->daddr);

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	if (!pctx) {
		netdev_dbg(dev, "no PDP ctx found for %pI4, skip\n",
			   &iph->daddr);
		return -ENOENT;
	}
	netdev_dbg(dev, "found PDP context %p\n", pctx);

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	rt = ip4_route_output_gtp(&fl4, pctx->sk, pctx->peer_addr_ip4.s_addr);
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	if (IS_ERR(rt)) {
		netdev_dbg(dev, "no route to SSGN %pI4\n",
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			   &pctx->peer_addr_ip4.s_addr);
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		dev->stats.tx_carrier_errors++;
		goto err;
	}

	if (rt->dst.dev == dev) {
		netdev_dbg(dev, "circular route to SSGN %pI4\n",
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			   &pctx->peer_addr_ip4.s_addr);
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		dev->stats.collisions++;
		goto err_rt;
	}

	skb_dst_drop(skb);

	/* This is similar to tnl_update_pmtu(). */
	df = iph->frag_off;
	if (df) {
		mtu = dst_mtu(&rt->dst) - dev->hard_header_len -
			sizeof(struct iphdr) - sizeof(struct udphdr);
		switch (pctx->gtp_version) {
		case GTP_V0:
			mtu -= sizeof(struct gtp0_header);
			break;
		case GTP_V1:
			mtu -= sizeof(struct gtp1_header);
			break;
		}
	} else {
		mtu = dst_mtu(&rt->dst);
	}

	rt->dst.ops->update_pmtu(&rt->dst, NULL, skb, mtu);

	if (!skb_is_gso(skb) && (iph->frag_off & htons(IP_DF)) &&
	    mtu < ntohs(iph->tot_len)) {
		netdev_dbg(dev, "packet too big, fragmentation needed\n");
		memset(IPCB(skb), 0, sizeof(*IPCB(skb)));
		icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED,
			  htonl(mtu));
		goto err_rt;
	}

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	gtp_set_pktinfo_ipv4(pktinfo, pctx->sk, iph, pctx, rt, &fl4, dev);
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	gtp_push_header(skb, pktinfo);

	return 0;
err_rt:
	ip_rt_put(rt);
err:
	return -EBADMSG;
}

static netdev_tx_t gtp_dev_xmit(struct sk_buff *skb, struct net_device *dev)
{
	unsigned int proto = ntohs(skb->protocol);
	struct gtp_pktinfo pktinfo;
	int err;

	/* Ensure there is sufficient headroom. */
	if (skb_cow_head(skb, dev->needed_headroom))
		goto tx_err;

	skb_reset_inner_headers(skb);

	/* PDP context lookups in gtp_build_skb_*() need rcu read-side lock. */
	rcu_read_lock();
	switch (proto) {
	case ETH_P_IP:
		err = gtp_build_skb_ip4(skb, dev, &pktinfo);
		break;
	default:
		err = -EOPNOTSUPP;
		break;
	}
	rcu_read_unlock();

	if (err < 0)
		goto tx_err;

	switch (proto) {
	case ETH_P_IP:
		netdev_dbg(pktinfo.dev, "gtp -> IP src: %pI4 dst: %pI4\n",
			   &pktinfo.iph->saddr, &pktinfo.iph->daddr);
		udp_tunnel_xmit_skb(pktinfo.rt, pktinfo.sk, skb,
				    pktinfo.fl4.saddr, pktinfo.fl4.daddr,
				    pktinfo.iph->tos,
				    ip4_dst_hoplimit(&pktinfo.rt->dst),
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				    0,
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				    pktinfo.gtph_port, pktinfo.gtph_port,
				    true, false);
		break;
	}

	return NETDEV_TX_OK;
tx_err:
	dev->stats.tx_errors++;
	dev_kfree_skb(skb);
	return NETDEV_TX_OK;
}

static const struct net_device_ops gtp_netdev_ops = {
	.ndo_init		= gtp_dev_init,
	.ndo_uninit		= gtp_dev_uninit,
	.ndo_start_xmit		= gtp_dev_xmit,
	.ndo_get_stats64	= ip_tunnel_get_stats64,
};

static void gtp_link_setup(struct net_device *dev)
{
	dev->netdev_ops		= &gtp_netdev_ops;
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	dev->needs_free_netdev	= true;
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	dev->hard_header_len = 0;
	dev->addr_len = 0;

	/* Zero header length. */
	dev->type = ARPHRD_NONE;
	dev->flags = IFF_POINTOPOINT | IFF_NOARP | IFF_MULTICAST;

	dev->priv_flags	|= IFF_NO_QUEUE;
	dev->features	|= NETIF_F_LLTX;
	netif_keep_dst(dev);

	/* Assume largest header, ie. GTPv0. */
	dev->needed_headroom	= LL_MAX_HEADER +
				  sizeof(struct iphdr) +
				  sizeof(struct udphdr) +
				  sizeof(struct gtp0_header);
}

static int gtp_hashtable_new(struct gtp_dev *gtp, int hsize);
static void gtp_hashtable_free(struct gtp_dev *gtp);
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static int gtp_encap_enable(struct gtp_dev *gtp, struct nlattr *data[]);
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static int gtp_newlink(struct net *src_net, struct net_device *dev,
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		       struct nlattr *tb[], struct nlattr *data[],
		       struct netlink_ext_ack *extack)
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{
	struct gtp_dev *gtp;
	struct gtp_net *gn;
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	int hashsize, err;
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	if (!data[IFLA_GTP_FD0] && !data[IFLA_GTP_FD1])
647 648 649 650
		return -EINVAL;

	gtp = netdev_priv(dev);

651
	err = gtp_encap_enable(gtp, data);
652
	if (err < 0)
653
		return err;
654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697

	if (!data[IFLA_GTP_PDP_HASHSIZE])
		hashsize = 1024;
	else
		hashsize = nla_get_u32(data[IFLA_GTP_PDP_HASHSIZE]);

	err = gtp_hashtable_new(gtp, hashsize);
	if (err < 0)
		goto out_encap;

	err = register_netdevice(dev);
	if (err < 0) {
		netdev_dbg(dev, "failed to register new netdev %d\n", err);
		goto out_hashtable;
	}

	gn = net_generic(dev_net(dev), gtp_net_id);
	list_add_rcu(&gtp->list, &gn->gtp_dev_list);

	netdev_dbg(dev, "registered new GTP interface\n");

	return 0;

out_hashtable:
	gtp_hashtable_free(gtp);
out_encap:
	gtp_encap_disable(gtp);
	return err;
}

static void gtp_dellink(struct net_device *dev, struct list_head *head)
{
	struct gtp_dev *gtp = netdev_priv(dev);

	gtp_encap_disable(gtp);
	gtp_hashtable_free(gtp);
	list_del_rcu(&gtp->list);
	unregister_netdevice_queue(dev, head);
}

static const struct nla_policy gtp_policy[IFLA_GTP_MAX + 1] = {
	[IFLA_GTP_FD0]			= { .type = NLA_U32 },
	[IFLA_GTP_FD1]			= { .type = NLA_U32 },
	[IFLA_GTP_PDP_HASHSIZE]		= { .type = NLA_U32 },
698
	[IFLA_GTP_ROLE]			= { .type = NLA_U32 },
699 700
};

701 702
static int gtp_validate(struct nlattr *tb[], struct nlattr *data[],
			struct netlink_ext_ack *extack)
703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744
{
	if (!data)
		return -EINVAL;

	return 0;
}

static size_t gtp_get_size(const struct net_device *dev)
{
	return nla_total_size(sizeof(__u32));	/* IFLA_GTP_PDP_HASHSIZE */
}

static int gtp_fill_info(struct sk_buff *skb, const struct net_device *dev)
{
	struct gtp_dev *gtp = netdev_priv(dev);

	if (nla_put_u32(skb, IFLA_GTP_PDP_HASHSIZE, gtp->hash_size))
		goto nla_put_failure;

	return 0;

nla_put_failure:
	return -EMSGSIZE;
}

static struct rtnl_link_ops gtp_link_ops __read_mostly = {
	.kind		= "gtp",
	.maxtype	= IFLA_GTP_MAX,
	.policy		= gtp_policy,
	.priv_size	= sizeof(struct gtp_dev),
	.setup		= gtp_link_setup,
	.validate	= gtp_validate,
	.newlink	= gtp_newlink,
	.dellink	= gtp_dellink,
	.get_size	= gtp_get_size,
	.fill_info	= gtp_fill_info,
};

static int gtp_hashtable_new(struct gtp_dev *gtp, int hsize)
{
	int i;

745 746
	gtp->addr_hash = kmalloc_array(hsize, sizeof(struct hlist_head),
				       GFP_KERNEL);
747 748 749
	if (gtp->addr_hash == NULL)
		return -ENOMEM;

750 751
	gtp->tid_hash = kmalloc_array(hsize, sizeof(struct hlist_head),
				      GFP_KERNEL);
752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771
	if (gtp->tid_hash == NULL)
		goto err1;

	gtp->hash_size = hsize;

	for (i = 0; i < hsize; i++) {
		INIT_HLIST_HEAD(&gtp->addr_hash[i]);
		INIT_HLIST_HEAD(&gtp->tid_hash[i]);
	}
	return 0;
err1:
	kfree(gtp->addr_hash);
	return -ENOMEM;
}

static void gtp_hashtable_free(struct gtp_dev *gtp)
{
	struct pdp_ctx *pctx;
	int i;

772 773 774 775
	for (i = 0; i < gtp->hash_size; i++)
		hlist_for_each_entry_rcu(pctx, &gtp->tid_hash[i], hlist_tid)
			pdp_context_delete(pctx);

776 777 778 779 780
	synchronize_rcu();
	kfree(gtp->addr_hash);
	kfree(gtp->tid_hash);
}

781 782
static struct sock *gtp_encap_enable_socket(int fd, int type,
					    struct gtp_dev *gtp)
783 784
{
	struct udp_tunnel_sock_cfg tuncfg = {NULL};
785 786
	struct socket *sock;
	struct sock *sk;
787 788
	int err;

789
	pr_debug("enable gtp on %d, %d\n", fd, type);
790

791 792 793 794
	sock = sockfd_lookup(fd, &err);
	if (!sock) {
		pr_debug("gtp socket fd=%d not found\n", fd);
		return NULL;
795 796
	}

797 798 799 800
	if (sock->sk->sk_protocol != IPPROTO_UDP) {
		pr_debug("socket fd=%d not UDP\n", fd);
		sk = ERR_PTR(-EINVAL);
		goto out_sock;
801 802
	}

803 804 805
	if (rcu_dereference_sk_user_data(sock->sk)) {
		sk = ERR_PTR(-EBUSY);
		goto out_sock;
806 807
	}

808 809
	sk = sock->sk;
	sock_hold(sk);
810 811

	tuncfg.sk_user_data = gtp;
812
	tuncfg.encap_type = type;
813 814 815
	tuncfg.encap_rcv = gtp_encap_recv;
	tuncfg.encap_destroy = gtp_encap_destroy;

816
	setup_udp_tunnel_sock(sock_net(sock->sk), sock, &tuncfg);
817

818 819 820 821
out_sock:
	sockfd_put(sock);
	return sk;
}
822

823 824 825 826
static int gtp_encap_enable(struct gtp_dev *gtp, struct nlattr *data[])
{
	struct sock *sk1u = NULL;
	struct sock *sk0 = NULL;
827
	unsigned int role = GTP_ROLE_GGSN;
828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847

	if (data[IFLA_GTP_FD0]) {
		u32 fd0 = nla_get_u32(data[IFLA_GTP_FD0]);

		sk0 = gtp_encap_enable_socket(fd0, UDP_ENCAP_GTP0, gtp);
		if (IS_ERR(sk0))
			return PTR_ERR(sk0);
	}

	if (data[IFLA_GTP_FD1]) {
		u32 fd1 = nla_get_u32(data[IFLA_GTP_FD1]);

		sk1u = gtp_encap_enable_socket(fd1, UDP_ENCAP_GTP1U, gtp);
		if (IS_ERR(sk1u)) {
			if (sk0)
				gtp_encap_disable_sock(sk0);
			return PTR_ERR(sk1u);
		}
	}

848 849 850 851 852 853
	if (data[IFLA_GTP_ROLE]) {
		role = nla_get_u32(data[IFLA_GTP_ROLE]);
		if (role > GTP_ROLE_SGSN)
			return -EINVAL;
	}

854 855
	gtp->sk0 = sk0;
	gtp->sk1u = sk1u;
856
	gtp->role = role;
857 858

	return 0;
859 860
}

861
static struct gtp_dev *gtp_find_dev(struct net *src_net, struct nlattr *nla[])
862
{
863 864 865
	struct gtp_dev *gtp = NULL;
	struct net_device *dev;
	struct net *net;
866

867 868 869 870 871 872 873 874 875 876 877 878 879
	/* Examine the link attributes and figure out which network namespace
	 * we are talking about.
	 */
	if (nla[GTPA_NET_NS_FD])
		net = get_net_ns_by_fd(nla_get_u32(nla[GTPA_NET_NS_FD]));
	else
		net = get_net(src_net);

	if (IS_ERR(net))
		return NULL;

	/* Check if there's an existing gtpX device to configure */
	dev = dev_get_by_index_rcu(net, nla_get_u32(nla[GTPA_LINK]));
880
	if (dev && dev->netdev_ops == &gtp_netdev_ops)
881 882 883 884
		gtp = netdev_priv(dev);

	put_net(net);
	return gtp;
885 886 887 888 889 890
}

static void ipv4_pdp_fill(struct pdp_ctx *pctx, struct genl_info *info)
{
	pctx->gtp_version = nla_get_u32(info->attrs[GTPA_VERSION]);
	pctx->af = AF_INET;
891 892
	pctx->peer_addr_ip4.s_addr =
		nla_get_be32(info->attrs[GTPA_PEER_ADDRESS]);
893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913
	pctx->ms_addr_ip4.s_addr =
		nla_get_be32(info->attrs[GTPA_MS_ADDRESS]);

	switch (pctx->gtp_version) {
	case GTP_V0:
		/* According to TS 09.60, sections 7.5.1 and 7.5.2, the flow
		 * label needs to be the same for uplink and downlink packets,
		 * so let's annotate this.
		 */
		pctx->u.v0.tid = nla_get_u64(info->attrs[GTPA_TID]);
		pctx->u.v0.flow = nla_get_u16(info->attrs[GTPA_FLOW]);
		break;
	case GTP_V1:
		pctx->u.v1.i_tei = nla_get_u32(info->attrs[GTPA_I_TEI]);
		pctx->u.v1.o_tei = nla_get_u32(info->attrs[GTPA_O_TEI]);
		break;
	default:
		break;
	}
}

914 915
static int ipv4_pdp_add(struct gtp_dev *gtp, struct sock *sk,
			struct genl_info *info)
916
{
917
	struct net_device *dev = gtp->dev;
918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955
	u32 hash_ms, hash_tid = 0;
	struct pdp_ctx *pctx;
	bool found = false;
	__be32 ms_addr;

	ms_addr = nla_get_be32(info->attrs[GTPA_MS_ADDRESS]);
	hash_ms = ipv4_hashfn(ms_addr) % gtp->hash_size;

	hlist_for_each_entry_rcu(pctx, &gtp->addr_hash[hash_ms], hlist_addr) {
		if (pctx->ms_addr_ip4.s_addr == ms_addr) {
			found = true;
			break;
		}
	}

	if (found) {
		if (info->nlhdr->nlmsg_flags & NLM_F_EXCL)
			return -EEXIST;
		if (info->nlhdr->nlmsg_flags & NLM_F_REPLACE)
			return -EOPNOTSUPP;

		ipv4_pdp_fill(pctx, info);

		if (pctx->gtp_version == GTP_V0)
			netdev_dbg(dev, "GTPv0-U: update tunnel id = %llx (pdp %p)\n",
				   pctx->u.v0.tid, pctx);
		else if (pctx->gtp_version == GTP_V1)
			netdev_dbg(dev, "GTPv1-U: update tunnel id = %x/%x (pdp %p)\n",
				   pctx->u.v1.i_tei, pctx->u.v1.o_tei, pctx);

		return 0;

	}

	pctx = kmalloc(sizeof(struct pdp_ctx), GFP_KERNEL);
	if (pctx == NULL)
		return -ENOMEM;

956 957
	sock_hold(sk);
	pctx->sk = sk;
958
	pctx->dev = gtp->dev;
959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981
	ipv4_pdp_fill(pctx, info);
	atomic_set(&pctx->tx_seq, 0);

	switch (pctx->gtp_version) {
	case GTP_V0:
		/* TS 09.60: "The flow label identifies unambiguously a GTP
		 * flow.". We use the tid for this instead, I cannot find a
		 * situation in which this doesn't unambiguosly identify the
		 * PDP context.
		 */
		hash_tid = gtp0_hashfn(pctx->u.v0.tid) % gtp->hash_size;
		break;
	case GTP_V1:
		hash_tid = gtp1u_hashfn(pctx->u.v1.i_tei) % gtp->hash_size;
		break;
	}

	hlist_add_head_rcu(&pctx->hlist_addr, &gtp->addr_hash[hash_ms]);
	hlist_add_head_rcu(&pctx->hlist_tid, &gtp->tid_hash[hash_tid]);

	switch (pctx->gtp_version) {
	case GTP_V0:
		netdev_dbg(dev, "GTPv0-U: new PDP ctx id=%llx ssgn=%pI4 ms=%pI4 (pdp=%p)\n",
982
			   pctx->u.v0.tid, &pctx->peer_addr_ip4,
983 984 985 986 987
			   &pctx->ms_addr_ip4, pctx);
		break;
	case GTP_V1:
		netdev_dbg(dev, "GTPv1-U: new PDP ctx id=%x/%x ssgn=%pI4 ms=%pI4 (pdp=%p)\n",
			   pctx->u.v1.i_tei, pctx->u.v1.o_tei,
988
			   &pctx->peer_addr_ip4, &pctx->ms_addr_ip4, pctx);
989 990 991 992 993 994
		break;
	}

	return 0;
}

995 996 997 998 999 1000 1001 1002
static void pdp_context_free(struct rcu_head *head)
{
	struct pdp_ctx *pctx = container_of(head, struct pdp_ctx, rcu_head);

	sock_put(pctx->sk);
	kfree(pctx);
}

1003 1004 1005 1006
static void pdp_context_delete(struct pdp_ctx *pctx)
{
	hlist_del_rcu(&pctx->hlist_tid);
	hlist_del_rcu(&pctx->hlist_addr);
1007
	call_rcu(&pctx->rcu_head, pdp_context_free);
1008 1009
}

1010 1011
static int gtp_genl_new_pdp(struct sk_buff *skb, struct genl_info *info)
{
1012
	unsigned int version;
1013
	struct gtp_dev *gtp;
1014
	struct sock *sk;
1015
	int err;
1016 1017 1018

	if (!info->attrs[GTPA_VERSION] ||
	    !info->attrs[GTPA_LINK] ||
1019
	    !info->attrs[GTPA_PEER_ADDRESS] ||
1020 1021 1022
	    !info->attrs[GTPA_MS_ADDRESS])
		return -EINVAL;

1023 1024 1025
	version = nla_get_u32(info->attrs[GTPA_VERSION]);

	switch (version) {
1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040
	case GTP_V0:
		if (!info->attrs[GTPA_TID] ||
		    !info->attrs[GTPA_FLOW])
			return -EINVAL;
		break;
	case GTP_V1:
		if (!info->attrs[GTPA_I_TEI] ||
		    !info->attrs[GTPA_O_TEI])
			return -EINVAL;
		break;

	default:
		return -EINVAL;
	}

1041
	rcu_read_lock();
1042

1043 1044 1045 1046
	gtp = gtp_find_dev(sock_net(skb->sk), info->attrs);
	if (!gtp) {
		err = -ENODEV;
		goto out_unlock;
1047
	}
1048

1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061
	if (version == GTP_V0)
		sk = gtp->sk0;
	else if (version == GTP_V1)
		sk = gtp->sk1u;
	else
		sk = NULL;

	if (!sk) {
		err = -ENODEV;
		goto out_unlock;
	}

	err = ipv4_pdp_add(gtp, sk, info);
1062 1063 1064 1065

out_unlock:
	rcu_read_unlock();
	return err;
1066 1067
}

1068 1069
static struct pdp_ctx *gtp_find_pdp_by_link(struct net *net,
					    struct nlattr *nla[])
1070 1071 1072
{
	struct gtp_dev *gtp;

1073 1074 1075
	gtp = gtp_find_dev(net, nla);
	if (!gtp)
		return ERR_PTR(-ENODEV);
1076

1077 1078
	if (nla[GTPA_MS_ADDRESS]) {
		__be32 ip = nla_get_be32(nla[GTPA_MS_ADDRESS]);
1079

1080 1081 1082 1083 1084 1085 1086 1087
		return ipv4_pdp_find(gtp, ip);
	} else if (nla[GTPA_VERSION]) {
		u32 gtp_version = nla_get_u32(nla[GTPA_VERSION]);

		if (gtp_version == GTP_V0 && nla[GTPA_TID])
			return gtp0_pdp_find(gtp, nla_get_u64(nla[GTPA_TID]));
		else if (gtp_version == GTP_V1 && nla[GTPA_I_TEI])
			return gtp1_pdp_find(gtp, nla_get_u32(nla[GTPA_I_TEI]));
1088
	}
1089

1090 1091
	return ERR_PTR(-EINVAL);
}
1092

1093 1094 1095
static struct pdp_ctx *gtp_find_pdp(struct net *net, struct nlattr *nla[])
{
	struct pdp_ctx *pctx;
1096

1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120
	if (nla[GTPA_LINK])
		pctx = gtp_find_pdp_by_link(net, nla);
	else
		pctx = ERR_PTR(-EINVAL);

	if (!pctx)
		pctx = ERR_PTR(-ENOENT);

	return pctx;
}

static int gtp_genl_del_pdp(struct sk_buff *skb, struct genl_info *info)
{
	struct pdp_ctx *pctx;
	int err = 0;

	if (!info->attrs[GTPA_VERSION])
		return -EINVAL;

	rcu_read_lock();

	pctx = gtp_find_pdp(sock_net(skb->sk), info->attrs);
	if (IS_ERR(pctx)) {
		err = PTR_ERR(pctx);
1121 1122
		goto out_unlock;
	}
1123 1124

	if (pctx->gtp_version == GTP_V0)
1125
		netdev_dbg(pctx->dev, "GTPv0-U: deleting tunnel id = %llx (pdp %p)\n",
1126 1127
			   pctx->u.v0.tid, pctx);
	else if (pctx->gtp_version == GTP_V1)
1128
		netdev_dbg(pctx->dev, "GTPv1-U: deleting tunnel id = %x/%x (pdp %p)\n",
1129 1130
			   pctx->u.v1.i_tei, pctx->u.v1.o_tei, pctx);

1131
	pdp_context_delete(pctx);
1132

1133 1134 1135
out_unlock:
	rcu_read_unlock();
	return err;
1136 1137
}

1138
static struct genl_family gtp_genl_family;
1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150

static int gtp_genl_fill_info(struct sk_buff *skb, u32 snd_portid, u32 snd_seq,
			      u32 type, struct pdp_ctx *pctx)
{
	void *genlh;

	genlh = genlmsg_put(skb, snd_portid, snd_seq, &gtp_genl_family, 0,
			    type);
	if (genlh == NULL)
		goto nlmsg_failure;

	if (nla_put_u32(skb, GTPA_VERSION, pctx->gtp_version) ||
1151
	    nla_put_be32(skb, GTPA_PEER_ADDRESS, pctx->peer_addr_ip4.s_addr) ||
1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181
	    nla_put_be32(skb, GTPA_MS_ADDRESS, pctx->ms_addr_ip4.s_addr))
		goto nla_put_failure;

	switch (pctx->gtp_version) {
	case GTP_V0:
		if (nla_put_u64_64bit(skb, GTPA_TID, pctx->u.v0.tid, GTPA_PAD) ||
		    nla_put_u16(skb, GTPA_FLOW, pctx->u.v0.flow))
			goto nla_put_failure;
		break;
	case GTP_V1:
		if (nla_put_u32(skb, GTPA_I_TEI, pctx->u.v1.i_tei) ||
		    nla_put_u32(skb, GTPA_O_TEI, pctx->u.v1.o_tei))
			goto nla_put_failure;
		break;
	}
	genlmsg_end(skb, genlh);
	return 0;

nlmsg_failure:
nla_put_failure:
	genlmsg_cancel(skb, genlh);
	return -EMSGSIZE;
}

static int gtp_genl_get_pdp(struct sk_buff *skb, struct genl_info *info)
{
	struct pdp_ctx *pctx = NULL;
	struct sk_buff *skb2;
	int err;

1182
	if (!info->attrs[GTPA_VERSION])
1183 1184
		return -EINVAL;

1185
	rcu_read_lock();
1186

1187 1188 1189
	pctx = gtp_find_pdp(sock_net(skb->sk), info->attrs);
	if (IS_ERR(pctx)) {
		err = PTR_ERR(pctx);
1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257
		goto err_unlock;
	}

	skb2 = genlmsg_new(NLMSG_GOODSIZE, GFP_ATOMIC);
	if (skb2 == NULL) {
		err = -ENOMEM;
		goto err_unlock;
	}

	err = gtp_genl_fill_info(skb2, NETLINK_CB(skb).portid,
				 info->snd_seq, info->nlhdr->nlmsg_type, pctx);
	if (err < 0)
		goto err_unlock_free;

	rcu_read_unlock();
	return genlmsg_unicast(genl_info_net(info), skb2, info->snd_portid);

err_unlock_free:
	kfree_skb(skb2);
err_unlock:
	rcu_read_unlock();
	return err;
}

static int gtp_genl_dump_pdp(struct sk_buff *skb,
				struct netlink_callback *cb)
{
	struct gtp_dev *last_gtp = (struct gtp_dev *)cb->args[2], *gtp;
	struct net *net = sock_net(skb->sk);
	struct gtp_net *gn = net_generic(net, gtp_net_id);
	unsigned long tid = cb->args[1];
	int i, k = cb->args[0], ret;
	struct pdp_ctx *pctx;

	if (cb->args[4])
		return 0;

	list_for_each_entry_rcu(gtp, &gn->gtp_dev_list, list) {
		if (last_gtp && last_gtp != gtp)
			continue;
		else
			last_gtp = NULL;

		for (i = k; i < gtp->hash_size; i++) {
			hlist_for_each_entry_rcu(pctx, &gtp->tid_hash[i], hlist_tid) {
				if (tid && tid != pctx->u.tid)
					continue;
				else
					tid = 0;

				ret = gtp_genl_fill_info(skb,
							 NETLINK_CB(cb->skb).portid,
							 cb->nlh->nlmsg_seq,
							 cb->nlh->nlmsg_type, pctx);
				if (ret < 0) {
					cb->args[0] = i;
					cb->args[1] = pctx->u.tid;
					cb->args[2] = (unsigned long)gtp;
					goto out;
				}
			}
		}
	}
	cb->args[4] = 1;
out:
	return skb->len;
}

1258
static const struct nla_policy gtp_genl_policy[GTPA_MAX + 1] = {
1259 1260 1261
	[GTPA_LINK]		= { .type = NLA_U32, },
	[GTPA_VERSION]		= { .type = NLA_U32, },
	[GTPA_TID]		= { .type = NLA_U64, },
1262
	[GTPA_PEER_ADDRESS]	= { .type = NLA_U32, },
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	[GTPA_MS_ADDRESS]	= { .type = NLA_U32, },
	[GTPA_FLOW]		= { .type = NLA_U16, },
	[GTPA_NET_NS_FD]	= { .type = NLA_U32, },
	[GTPA_I_TEI]		= { .type = NLA_U32, },
	[GTPA_O_TEI]		= { .type = NLA_U32, },
};

static const struct genl_ops gtp_genl_ops[] = {
	{
		.cmd = GTP_CMD_NEWPDP,
		.doit = gtp_genl_new_pdp,
		.policy = gtp_genl_policy,
		.flags = GENL_ADMIN_PERM,
	},
	{
		.cmd = GTP_CMD_DELPDP,
		.doit = gtp_genl_del_pdp,
		.policy = gtp_genl_policy,
		.flags = GENL_ADMIN_PERM,
	},
	{
		.cmd = GTP_CMD_GETPDP,
		.doit = gtp_genl_get_pdp,
		.dumpit = gtp_genl_dump_pdp,
		.policy = gtp_genl_policy,
		.flags = GENL_ADMIN_PERM,
	},
};

1292
static struct genl_family gtp_genl_family __ro_after_init = {
1293 1294 1295 1296 1297 1298 1299 1300 1301 1302
	.name		= "gtp",
	.version	= 0,
	.hdrsize	= 0,
	.maxattr	= GTPA_MAX,
	.netnsok	= true,
	.module		= THIS_MODULE,
	.ops		= gtp_genl_ops,
	.n_ops		= ARRAY_SIZE(gtp_genl_ops),
};

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static int __net_init gtp_net_init(struct net *net)
{
	struct gtp_net *gn = net_generic(net, gtp_net_id);

	INIT_LIST_HEAD(&gn->gtp_dev_list);
	return 0;
}

static void __net_exit gtp_net_exit(struct net *net)
{
	struct gtp_net *gn = net_generic(net, gtp_net_id);
	struct gtp_dev *gtp;
	LIST_HEAD(list);

	rtnl_lock();
	list_for_each_entry(gtp, &gn->gtp_dev_list, list)
		gtp_dellink(gtp->dev, &list);

	unregister_netdevice_many(&list);
	rtnl_unlock();
}

static struct pernet_operations gtp_net_ops = {
	.init	= gtp_net_init,
	.exit	= gtp_net_exit,
	.id	= &gtp_net_id,
	.size	= sizeof(struct gtp_net),
};

static int __init gtp_init(void)
{
	int err;

	get_random_bytes(&gtp_h_initval, sizeof(gtp_h_initval));

	err = rtnl_link_register(&gtp_link_ops);
	if (err < 0)
		goto error_out;

1342
	err = genl_register_family(&gtp_genl_family);
1343 1344 1345 1346 1347 1348 1349
	if (err < 0)
		goto unreg_rtnl_link;

	err = register_pernet_subsys(&gtp_net_ops);
	if (err < 0)
		goto unreg_genl_family;

1350
	pr_info("GTP module loaded (pdp ctx size %zd bytes)\n",
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		sizeof(struct pdp_ctx));
	return 0;

unreg_genl_family:
	genl_unregister_family(&gtp_genl_family);
unreg_rtnl_link:
	rtnl_link_unregister(&gtp_link_ops);
error_out:
	pr_err("error loading GTP module loaded\n");
	return err;
}
late_initcall(gtp_init);

static void __exit gtp_fini(void)
{
	unregister_pernet_subsys(&gtp_net_ops);
	genl_unregister_family(&gtp_genl_family);
	rtnl_link_unregister(&gtp_link_ops);

	pr_info("GTP module unloaded\n");
}
module_exit(gtp_fini);

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Harald Welte <hwelte@sysmocom.de>");
MODULE_DESCRIPTION("Interface driver for GTP encapsulated traffic");
MODULE_ALIAS_RTNL_LINK("gtp");
1378
MODULE_ALIAS_GENL_FAMILY("gtp");