/* GTP according to GSM TS 09.60 / 3GPP TS 29.060
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*
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* (C) 2012-2014 by sysmocom - s.f.m.c. GmbH
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* (C) 2016 by Pablo Neira Ayuso <pablo@netfilter.org>
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*
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* Author: Harald Welte <hwelte@sysmocom.de>
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* Pablo Neira Ayuso <pablo@netfilter.org>
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* Andreas Schultz <aschultz@travelping.com>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/module.h>
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#include <linux/skbuff.h>
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#include <linux/udp.h>
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#include <linux/rculist.h>
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#include <linux/jhash.h>
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#include <linux/if_tunnel.h>
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#include <linux/net.h>
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#include <linux/file.h>
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#include <linux/gtp.h>
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#include <net/net_namespace.h>
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#include <net/protocol.h>
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#include <net/ip.h>
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#include <net/udp.h>
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#include <net/udp_tunnel.h>
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#include <net/icmp.h>
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#include <net/xfrm.h>
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#include <net/genetlink.h>
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#include <net/netns/generic.h>
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#include <net/gtp.h>
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/* An active session for the subscriber. */
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struct pdp_ctx {
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struct hlist_node hlist_tid;
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struct hlist_node hlist_addr;
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union {
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struct {
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u64 tid;
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u16 flow;
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} v0;
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struct {
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u32 i_tei;
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u32 o_tei;
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} v1;
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} u;
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u8 gtp_version;
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u16 af;
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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;
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struct rcu_head rcu_head;
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};
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/* One instance of the GTP device. */
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struct gtp_dev {
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struct list_head list;
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struct sock *sk0;
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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;
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struct hlist_head *tid_hash;
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struct hlist_head *addr_hash;
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};
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static unsigned int gtp_net_id __read_mostly;
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|
struct gtp_net {
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struct list_head gtp_dev_list;
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};
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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)
|
{
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u32 *tid32 = (u32 *) &tid;
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return jhash_2words(tid32[0], tid32[1], gtp_h_initval);
|
}
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static inline u32 gtp1u_hashfn(u32 tid)
|
{
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return jhash_1word(tid, gtp_h_initval);
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}
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static inline u32 ipv4_hashfn(__be32 ip)
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{
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return jhash_1word((__force u32)ip, gtp_h_initval);
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}
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/* Resolve a PDP context structure based on the 64bit TID. */
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static struct pdp_ctx *gtp0_pdp_find(struct gtp_dev *gtp, u64 tid)
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{
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struct hlist_head *head;
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struct pdp_ctx *pdp;
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|
head = >p->tid_hash[gtp0_hashfn(tid) % gtp->hash_size];
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hlist_for_each_entry_rcu(pdp, head, hlist_tid) {
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if (pdp->gtp_version == GTP_V0 &&
|
pdp->u.v0.tid == tid)
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return pdp;
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}
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return NULL;
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}
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/* Resolve a PDP context structure based on the 32bit TEI. */
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static struct pdp_ctx *gtp1_pdp_find(struct gtp_dev *gtp, u32 tid)
|
{
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struct hlist_head *head;
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struct pdp_ctx *pdp;
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|
head = >p->tid_hash[gtp1u_hashfn(tid) % gtp->hash_size];
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hlist_for_each_entry_rcu(pdp, head, hlist_tid) {
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if (pdp->gtp_version == GTP_V1 &&
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pdp->u.v1.i_tei == tid)
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return pdp;
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}
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return NULL;
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}
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/* Resolve a PDP context based on IPv4 address of MS. */
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static struct pdp_ctx *ipv4_pdp_find(struct gtp_dev *gtp, __be32 ms_addr)
|
{
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struct hlist_head *head;
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struct pdp_ctx *pdp;
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|
head = >p->addr_hash[ipv4_hashfn(ms_addr) % gtp->hash_size];
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hlist_for_each_entry_rcu(pdp, head, hlist_addr) {
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if (pdp->af == AF_INET &&
|
pdp->ms_addr_ip4.s_addr == ms_addr)
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return pdp;
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}
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|
return NULL;
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}
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static bool gtp_check_ms_ipv4(struct sk_buff *skb, struct pdp_ctx *pctx,
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unsigned int hdrlen, unsigned int role)
|
{
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struct iphdr *iph;
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|
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)
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return iph->daddr == pctx->ms_addr_ip4.s_addr;
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else
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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
|
* 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)
|
{
|
switch (ntohs(skb->protocol)) {
|
case ETH_P_IP:
|
return gtp_check_ms_ipv4(skb, pctx, hdrlen, role);
|
}
|
return false;
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}
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static int gtp_rx(struct pdp_ctx *pctx, struct sk_buff *skb,
|
unsigned int hdrlen, unsigned int role)
|
{
|
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");
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return 1;
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}
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/* Get rid of the GTP + UDP headers. */
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if (iptunnel_pull_header(skb, hdrlen, skb->protocol,
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!net_eq(sock_net(pctx->sk), dev_net(pctx->dev))))
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return -1;
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netdev_dbg(pctx->dev, "forwarding packet from GGSN to uplink\n");
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/* Now that the UDP and the GTP header have been removed, set up the
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* new network header. This is required by the upper layer to
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* calculate the transport header.
|
*/
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skb_reset_network_header(skb);
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|
skb->dev = pctx->dev;
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|
stats = this_cpu_ptr(pctx->dev->tstats);
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u64_stats_update_begin(&stats->syncp);
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stats->rx_packets++;
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stats->rx_bytes += skb->len;
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u64_stats_update_end(&stats->syncp);
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|
netif_rx(skb);
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return 0;
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}
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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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{
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unsigned int hdrlen = sizeof(struct udphdr) +
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sizeof(struct gtp0_header);
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struct gtp0_header *gtp0;
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struct pdp_ctx *pctx;
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if (!pskb_may_pull(skb, hdrlen))
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return -1;
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gtp0 = (struct gtp0_header *)(skb->data + sizeof(struct udphdr));
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if ((gtp0->flags >> 5) != GTP_V0)
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return 1;
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if (gtp0->type != GTP_TPDU)
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return 1;
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pctx = gtp0_pdp_find(gtp, be64_to_cpu(gtp0->tid));
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if (!pctx) {
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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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{
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unsigned int hdrlen = sizeof(struct udphdr) +
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sizeof(struct gtp1_header);
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struct gtp1_header *gtp1;
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struct pdp_ctx *pctx;
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if (!pskb_may_pull(skb, hdrlen))
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return -1;
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gtp1 = (struct gtp1_header *)(skb->data + sizeof(struct udphdr));
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if ((gtp1->flags >> 5) != GTP_V1)
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return 1;
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if (gtp1->type != GTP_TPDU)
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return 1;
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/* From 29.060: "This field shall be present if and only if any one or
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* more of the S, PN and E flags are set.".
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*
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* If any of the bit is set, then the remaining ones also have to be
|
* set.
|
*/
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if (gtp1->flags & GTP1_F_MASK)
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hdrlen += 4;
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/* Make sure the header is larger enough, including extensions. */
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if (!pskb_may_pull(skb, hdrlen))
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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));
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if (!pctx) {
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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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|
lock_sock(sk);
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gtp = sk->sk_user_data;
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if (gtp) {
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if (gtp->sk0 == sk)
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gtp->sk0 = NULL;
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else
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gtp->sk1u = NULL;
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udp_sk(sk)->encap_type = 0;
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rcu_assign_sk_user_data(sk, NULL);
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sock_put(sk);
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}
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release_sock(sk);
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}
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static void gtp_encap_destroy(struct sock *sk)
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{
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rtnl_lock();
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__gtp_encap_destroy(sk);
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rtnl_unlock();
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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);
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}
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static void gtp_encap_disable(struct gtp_dev *gtp)
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{
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gtp_encap_disable_sock(gtp->sk0);
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gtp_encap_disable_sock(gtp->sk1u);
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}
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/* UDP encapsulation receive handler. See net/ipv4/udp.c.
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* Return codes: 0: success, <0: error, >0: pass up to userspace UDP socket.
|
*/
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static int gtp_encap_recv(struct sock *sk, struct sk_buff *skb)
|
{
|
struct gtp_dev *gtp;
|
int ret = 0;
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gtp = rcu_dereference_sk_user_data(sk);
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if (!gtp)
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return 1;
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netdev_dbg(gtp->dev, "encap_recv sk=%p\n", sk);
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|
switch (udp_sk(sk)->encap_type) {
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case UDP_ENCAP_GTP0:
|
netdev_dbg(gtp->dev, "received GTP0 packet\n");
|
ret = gtp0_udp_encap_recv(gtp, skb);
|
break;
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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;
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default:
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ret = -1; /* Shouldn't happen. */
|
}
|
|
switch (ret) {
|
case 1:
|
netdev_dbg(gtp->dev, "pass up to the process\n");
|
break;
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case 0:
|
break;
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case -1:
|
netdev_dbg(gtp->dev, "GTP packet has been dropped\n");
|
kfree_skb(skb);
|
ret = 0;
|
break;
|
}
|
|
return ret;
|
}
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static int gtp_dev_init(struct net_device *dev)
|
{
|
struct gtp_dev *gtp = netdev_priv(dev);
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|
gtp->dev = dev;
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dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
|
if (!dev->tstats)
|
return -ENOMEM;
|
|
return 0;
|
}
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|
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)
|
{
|
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;
|
|
return ip_route_output_key(sock_net(sk), fl4);
|
}
|
|
static inline void gtp0_push_header(struct sk_buff *skb, struct pdp_ctx *pctx)
|
{
|
int payload_len = skb->len;
|
struct gtp0_header *gtp0;
|
|
gtp0 = skb_push(skb, sizeof(*gtp0));
|
|
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;
|
|
gtp1 = skb_push(skb, sizeof(*gtp1));
|
|
/* Bits 8 7 6 5 4 3 2 1
|
* +--+--+--+--+--+--+--+--+
|
* |version |PT| 0| E| S|PN|
|
* +--+--+--+--+--+--+--+--+
|
* 0 0 1 1 1 0 0 0
|
*/
|
gtp1->flags = 0x30; /* v1, GTP-non-prime. */
|
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);
|
if (gtp->role == GTP_ROLE_SGSN)
|
pctx = ipv4_pdp_find(gtp, iph->saddr);
|
else
|
pctx = ipv4_pdp_find(gtp, iph->daddr);
|
|
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);
|
|
rt = ip4_route_output_gtp(&fl4, pctx->sk, pctx->peer_addr_ip4.s_addr);
|
if (IS_ERR(rt)) {
|
netdev_dbg(dev, "no route to SSGN %pI4\n",
|
&pctx->peer_addr_ip4.s_addr);
|
dev->stats.tx_carrier_errors++;
|
goto err;
|
}
|
|
if (rt->dst.dev == dev) {
|
netdev_dbg(dev, "circular route to SSGN %pI4\n",
|
&pctx->peer_addr_ip4.s_addr);
|
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, false);
|
|
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");
|
icmp_ndo_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED,
|
htonl(mtu));
|
goto err_rt;
|
}
|
|
gtp_set_pktinfo_ipv4(pktinfo, pctx->sk, iph, pctx, rt, &fl4, dev);
|
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),
|
0,
|
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 = >p_netdev_ops;
|
dev->needs_free_netdev = true;
|
|
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 int gtp_encap_enable(struct gtp_dev *gtp, struct nlattr *data[]);
|
|
static void gtp_destructor(struct net_device *dev)
|
{
|
struct gtp_dev *gtp = netdev_priv(dev);
|
|
kfree(gtp->addr_hash);
|
kfree(gtp->tid_hash);
|
}
|
|
static int gtp_newlink(struct net *src_net, struct net_device *dev,
|
struct nlattr *tb[], struct nlattr *data[],
|
struct netlink_ext_ack *extack)
|
{
|
struct gtp_dev *gtp;
|
struct gtp_net *gn;
|
int hashsize, err;
|
|
if (!data[IFLA_GTP_FD0] && !data[IFLA_GTP_FD1])
|
return -EINVAL;
|
|
gtp = netdev_priv(dev);
|
|
if (!data[IFLA_GTP_PDP_HASHSIZE]) {
|
hashsize = 1024;
|
} else {
|
hashsize = nla_get_u32(data[IFLA_GTP_PDP_HASHSIZE]);
|
if (!hashsize)
|
hashsize = 1024;
|
}
|
|
err = gtp_hashtable_new(gtp, hashsize);
|
if (err < 0)
|
return err;
|
|
err = gtp_encap_enable(gtp, data);
|
if (err < 0)
|
goto out_hashtable;
|
|
err = register_netdevice(dev);
|
if (err < 0) {
|
netdev_dbg(dev, "failed to register new netdev %d\n", err);
|
goto out_encap;
|
}
|
|
gn = net_generic(dev_net(dev), gtp_net_id);
|
list_add_rcu(>p->list, &gn->gtp_dev_list);
|
dev->priv_destructor = gtp_destructor;
|
|
netdev_dbg(dev, "registered new GTP interface\n");
|
|
return 0;
|
|
out_encap:
|
gtp_encap_disable(gtp);
|
out_hashtable:
|
kfree(gtp->addr_hash);
|
kfree(gtp->tid_hash);
|
return err;
|
}
|
|
static void gtp_dellink(struct net_device *dev, struct list_head *head)
|
{
|
struct gtp_dev *gtp = netdev_priv(dev);
|
struct pdp_ctx *pctx;
|
int i;
|
|
for (i = 0; i < gtp->hash_size; i++)
|
hlist_for_each_entry_rcu(pctx, >p->tid_hash[i], hlist_tid)
|
pdp_context_delete(pctx);
|
|
gtp_encap_disable(gtp);
|
list_del_rcu(>p->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 },
|
[IFLA_GTP_ROLE] = { .type = NLA_U32 },
|
};
|
|
static int gtp_validate(struct nlattr *tb[], struct nlattr *data[],
|
struct netlink_ext_ack *extack)
|
{
|
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;
|
|
gtp->addr_hash = kmalloc_array(hsize, sizeof(struct hlist_head),
|
GFP_KERNEL | __GFP_NOWARN);
|
if (gtp->addr_hash == NULL)
|
return -ENOMEM;
|
|
gtp->tid_hash = kmalloc_array(hsize, sizeof(struct hlist_head),
|
GFP_KERNEL | __GFP_NOWARN);
|
if (gtp->tid_hash == NULL)
|
goto err1;
|
|
gtp->hash_size = hsize;
|
|
for (i = 0; i < hsize; i++) {
|
INIT_HLIST_HEAD(>p->addr_hash[i]);
|
INIT_HLIST_HEAD(>p->tid_hash[i]);
|
}
|
return 0;
|
err1:
|
kfree(gtp->addr_hash);
|
return -ENOMEM;
|
}
|
|
static struct sock *gtp_encap_enable_socket(int fd, int type,
|
struct gtp_dev *gtp)
|
{
|
struct udp_tunnel_sock_cfg tuncfg = {NULL};
|
struct socket *sock;
|
struct sock *sk;
|
int err;
|
|
pr_debug("enable gtp on %d, %d\n", fd, type);
|
|
sock = sockfd_lookup(fd, &err);
|
if (!sock) {
|
pr_debug("gtp socket fd=%d not found\n", fd);
|
return NULL;
|
}
|
|
sk = sock->sk;
|
if (sk->sk_protocol != IPPROTO_UDP ||
|
sk->sk_type != SOCK_DGRAM ||
|
(sk->sk_family != AF_INET && sk->sk_family != AF_INET6)) {
|
pr_debug("socket fd=%d not UDP\n", fd);
|
sk = ERR_PTR(-EINVAL);
|
goto out_sock;
|
}
|
|
lock_sock(sk);
|
if (sk->sk_user_data) {
|
sk = ERR_PTR(-EBUSY);
|
goto out_rel_sock;
|
}
|
|
sock_hold(sk);
|
|
tuncfg.sk_user_data = gtp;
|
tuncfg.encap_type = type;
|
tuncfg.encap_rcv = gtp_encap_recv;
|
tuncfg.encap_destroy = gtp_encap_destroy;
|
|
setup_udp_tunnel_sock(sock_net(sock->sk), sock, &tuncfg);
|
|
out_rel_sock:
|
release_sock(sock->sk);
|
out_sock:
|
sockfd_put(sock);
|
return sk;
|
}
|
|
static int gtp_encap_enable(struct gtp_dev *gtp, struct nlattr *data[])
|
{
|
struct sock *sk1u = NULL;
|
struct sock *sk0 = NULL;
|
unsigned int role = GTP_ROLE_GGSN;
|
|
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);
|
}
|
}
|
|
if (data[IFLA_GTP_ROLE]) {
|
role = nla_get_u32(data[IFLA_GTP_ROLE]);
|
if (role > GTP_ROLE_SGSN) {
|
if (sk0)
|
gtp_encap_disable_sock(sk0);
|
if (sk1u)
|
gtp_encap_disable_sock(sk1u);
|
return -EINVAL;
|
}
|
}
|
|
gtp->sk0 = sk0;
|
gtp->sk1u = sk1u;
|
gtp->role = role;
|
|
return 0;
|
}
|
|
static struct gtp_dev *gtp_find_dev(struct net *src_net, struct nlattr *nla[])
|
{
|
struct gtp_dev *gtp = NULL;
|
struct net_device *dev;
|
struct net *net;
|
|
/* 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]));
|
if (dev && dev->netdev_ops == >p_netdev_ops)
|
gtp = netdev_priv(dev);
|
|
put_net(net);
|
return gtp;
|
}
|
|
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;
|
pctx->peer_addr_ip4.s_addr =
|
nla_get_be32(info->attrs[GTPA_PEER_ADDRESS]);
|
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;
|
}
|
}
|
|
static int gtp_pdp_add(struct gtp_dev *gtp, struct sock *sk,
|
struct genl_info *info)
|
{
|
struct pdp_ctx *pctx, *pctx_tid = NULL;
|
struct net_device *dev = gtp->dev;
|
u32 hash_ms, hash_tid = 0;
|
unsigned int version;
|
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;
|
version = nla_get_u32(info->attrs[GTPA_VERSION]);
|
|
pctx = ipv4_pdp_find(gtp, ms_addr);
|
if (pctx)
|
found = true;
|
if (version == GTP_V0)
|
pctx_tid = gtp0_pdp_find(gtp,
|
nla_get_u64(info->attrs[GTPA_TID]));
|
else if (version == GTP_V1)
|
pctx_tid = gtp1_pdp_find(gtp,
|
nla_get_u32(info->attrs[GTPA_I_TEI]));
|
if (pctx_tid)
|
found = true;
|
|
if (found) {
|
if (info->nlhdr->nlmsg_flags & NLM_F_EXCL)
|
return -EEXIST;
|
if (info->nlhdr->nlmsg_flags & NLM_F_REPLACE)
|
return -EOPNOTSUPP;
|
|
if (pctx && pctx_tid)
|
return -EEXIST;
|
if (!pctx)
|
pctx = pctx_tid;
|
|
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(*pctx), GFP_ATOMIC);
|
if (pctx == NULL)
|
return -ENOMEM;
|
|
sock_hold(sk);
|
pctx->sk = sk;
|
pctx->dev = gtp->dev;
|
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, >p->addr_hash[hash_ms]);
|
hlist_add_head_rcu(&pctx->hlist_tid, >p->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",
|
pctx->u.v0.tid, &pctx->peer_addr_ip4,
|
&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,
|
&pctx->peer_addr_ip4, &pctx->ms_addr_ip4, pctx);
|
break;
|
}
|
|
return 0;
|
}
|
|
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);
|
}
|
|
static void pdp_context_delete(struct pdp_ctx *pctx)
|
{
|
hlist_del_rcu(&pctx->hlist_tid);
|
hlist_del_rcu(&pctx->hlist_addr);
|
call_rcu(&pctx->rcu_head, pdp_context_free);
|
}
|
|
static int gtp_genl_new_pdp(struct sk_buff *skb, struct genl_info *info)
|
{
|
unsigned int version;
|
struct gtp_dev *gtp;
|
struct sock *sk;
|
int err;
|
|
if (!info->attrs[GTPA_VERSION] ||
|
!info->attrs[GTPA_LINK] ||
|
!info->attrs[GTPA_PEER_ADDRESS] ||
|
!info->attrs[GTPA_MS_ADDRESS])
|
return -EINVAL;
|
|
version = nla_get_u32(info->attrs[GTPA_VERSION]);
|
|
switch (version) {
|
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;
|
}
|
|
rtnl_lock();
|
rcu_read_lock();
|
|
gtp = gtp_find_dev(sock_net(skb->sk), info->attrs);
|
if (!gtp) {
|
err = -ENODEV;
|
goto out_unlock;
|
}
|
|
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 = gtp_pdp_add(gtp, sk, info);
|
|
out_unlock:
|
rcu_read_unlock();
|
rtnl_unlock();
|
return err;
|
}
|
|
static struct pdp_ctx *gtp_find_pdp_by_link(struct net *net,
|
struct nlattr *nla[])
|
{
|
struct gtp_dev *gtp;
|
|
gtp = gtp_find_dev(net, nla);
|
if (!gtp)
|
return ERR_PTR(-ENODEV);
|
|
if (nla[GTPA_MS_ADDRESS]) {
|
__be32 ip = nla_get_be32(nla[GTPA_MS_ADDRESS]);
|
|
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]));
|
}
|
|
return ERR_PTR(-EINVAL);
|
}
|
|
static struct pdp_ctx *gtp_find_pdp(struct net *net, struct nlattr *nla[])
|
{
|
struct pdp_ctx *pctx;
|
|
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);
|
goto out_unlock;
|
}
|
|
if (pctx->gtp_version == GTP_V0)
|
netdev_dbg(pctx->dev, "GTPv0-U: deleting tunnel id = %llx (pdp %p)\n",
|
pctx->u.v0.tid, pctx);
|
else if (pctx->gtp_version == GTP_V1)
|
netdev_dbg(pctx->dev, "GTPv1-U: deleting tunnel id = %x/%x (pdp %p)\n",
|
pctx->u.v1.i_tei, pctx->u.v1.o_tei, pctx);
|
|
pdp_context_delete(pctx);
|
|
out_unlock:
|
rcu_read_unlock();
|
return err;
|
}
|
|
static struct genl_family gtp_genl_family;
|
|
static int gtp_genl_fill_info(struct sk_buff *skb, u32 snd_portid, u32 snd_seq,
|
int flags, u32 type, struct pdp_ctx *pctx)
|
{
|
void *genlh;
|
|
genlh = genlmsg_put(skb, snd_portid, snd_seq, >p_genl_family, flags,
|
type);
|
if (genlh == NULL)
|
goto nlmsg_failure;
|
|
if (nla_put_u32(skb, GTPA_VERSION, pctx->gtp_version) ||
|
nla_put_u32(skb, GTPA_LINK, pctx->dev->ifindex) ||
|
nla_put_be32(skb, GTPA_PEER_ADDRESS, pctx->peer_addr_ip4.s_addr) ||
|
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;
|
|
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);
|
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,
|
0, 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;
|
int i, j, bucket = cb->args[0], skip = cb->args[1];
|
struct net *net = sock_net(skb->sk);
|
struct pdp_ctx *pctx;
|
struct gtp_net *gn;
|
|
gn = net_generic(net, gtp_net_id);
|
|
if (cb->args[4])
|
return 0;
|
|
rcu_read_lock();
|
list_for_each_entry_rcu(gtp, &gn->gtp_dev_list, list) {
|
if (last_gtp && last_gtp != gtp)
|
continue;
|
else
|
last_gtp = NULL;
|
|
for (i = bucket; i < gtp->hash_size; i++) {
|
j = 0;
|
hlist_for_each_entry_rcu(pctx, >p->tid_hash[i],
|
hlist_tid) {
|
if (j >= skip &&
|
gtp_genl_fill_info(skb,
|
NETLINK_CB(cb->skb).portid,
|
cb->nlh->nlmsg_seq,
|
NLM_F_MULTI,
|
cb->nlh->nlmsg_type, pctx)) {
|
cb->args[0] = i;
|
cb->args[1] = j;
|
cb->args[2] = (unsigned long)gtp;
|
goto out;
|
}
|
j++;
|
}
|
skip = 0;
|
}
|
bucket = 0;
|
}
|
cb->args[4] = 1;
|
out:
|
rcu_read_unlock();
|
return skb->len;
|
}
|
|
static const struct nla_policy gtp_genl_policy[GTPA_MAX + 1] = {
|
[GTPA_LINK] = { .type = NLA_U32, },
|
[GTPA_VERSION] = { .type = NLA_U32, },
|
[GTPA_TID] = { .type = NLA_U64, },
|
[GTPA_PEER_ADDRESS] = { .type = NLA_U32, },
|
[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,
|
},
|
};
|
|
static struct genl_family gtp_genl_family __ro_after_init = {
|
.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),
|
};
|
|
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 = >p_net_id,
|
.size = sizeof(struct gtp_net),
|
};
|
|
static int __init gtp_init(void)
|
{
|
int err;
|
|
get_random_bytes(>p_h_initval, sizeof(gtp_h_initval));
|
|
err = rtnl_link_register(>p_link_ops);
|
if (err < 0)
|
goto error_out;
|
|
err = genl_register_family(>p_genl_family);
|
if (err < 0)
|
goto unreg_rtnl_link;
|
|
err = register_pernet_subsys(>p_net_ops);
|
if (err < 0)
|
goto unreg_genl_family;
|
|
pr_info("GTP module loaded (pdp ctx size %zd bytes)\n",
|
sizeof(struct pdp_ctx));
|
return 0;
|
|
unreg_genl_family:
|
genl_unregister_family(>p_genl_family);
|
unreg_rtnl_link:
|
rtnl_link_unregister(>p_link_ops);
|
error_out:
|
pr_err("error loading GTP module loaded\n");
|
return err;
|
}
|
late_initcall(gtp_init);
|
|
static void __exit gtp_fini(void)
|
{
|
genl_unregister_family(>p_genl_family);
|
rtnl_link_unregister(>p_link_ops);
|
unregister_pernet_subsys(>p_net_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");
|
MODULE_ALIAS_GENL_FAMILY("gtp");
|
