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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* PFCP according to 3GPP TS 29.244
*
* Copyright (C) 2022, Intel Corporation.
*/
#include <linux/module.h>
#include <linux/netdevice.h>
#include <linux/rculist.h>
#include <linux/skbuff.h>
#include <linux/types.h>
#include <net/udp.h>
#include <net/udp_tunnel.h>
#include <net/pfcp.h>
struct pfcp_dev {
struct list_head list;
struct socket *sock;
struct net_device *dev;
struct net *net;
};
static unsigned int pfcp_net_id __read_mostly;
struct pfcp_net {
struct list_head pfcp_dev_list;
};
static void pfcp_del_sock(struct pfcp_dev *pfcp)
{
udp_tunnel_sock_release(pfcp->sock);
pfcp->sock = NULL;
}
static void pfcp_dev_uninit(struct net_device *dev)
{
struct pfcp_dev *pfcp = netdev_priv(dev);
pfcp_del_sock(pfcp);
}
static int pfcp_dev_init(struct net_device *dev)
{
struct pfcp_dev *pfcp = netdev_priv(dev);
pfcp->dev = dev;
return 0;
}
static const struct net_device_ops pfcp_netdev_ops = {
.ndo_init = pfcp_dev_init,
.ndo_uninit = pfcp_dev_uninit,
.ndo_get_stats64 = dev_get_tstats64,
};
static const struct device_type pfcp_type = {
.name = "pfcp",
};
static void pfcp_link_setup(struct net_device *dev)
{
dev->netdev_ops = &pfcp_netdev_ops;
dev->needs_free_netdev = true;
SET_NETDEV_DEVTYPE(dev, &pfcp_type);
dev->hard_header_len = 0;
dev->addr_len = 0;
dev->type = ARPHRD_NONE;
dev->flags = IFF_POINTOPOINT | IFF_NOARP | IFF_MULTICAST;
dev->priv_flags |= IFF_NO_QUEUE;
netif_keep_dst(dev);
}
static struct socket *pfcp_create_sock(struct pfcp_dev *pfcp)
{
struct udp_tunnel_sock_cfg tuncfg = {};
struct udp_port_cfg udp_conf = {
.local_ip.s_addr = htonl(INADDR_ANY),
.family = AF_INET,
};
struct net *net = pfcp->net;
struct socket *sock;
int err;
udp_conf.local_udp_port = htons(PFCP_PORT);
err = udp_sock_create(net, &udp_conf, &sock);
if (err)
return ERR_PTR(err);
setup_udp_tunnel_sock(net, sock, &tuncfg);
return sock;
}
static int pfcp_add_sock(struct pfcp_dev *pfcp)
{
pfcp->sock = pfcp_create_sock(pfcp);
return PTR_ERR_OR_ZERO(pfcp->sock);
}
static int pfcp_newlink(struct net *net, struct net_device *dev,
struct nlattr *tb[], struct nlattr *data[],
struct netlink_ext_ack *extack)
{
struct pfcp_dev *pfcp = netdev_priv(dev);
struct pfcp_net *pn;
int err;
pfcp->net = net;
err = pfcp_add_sock(pfcp);
if (err) {
netdev_dbg(dev, "failed to add pfcp socket %d\n", err);
goto exit_err;
}
err = register_netdevice(dev);
if (err) {
netdev_dbg(dev, "failed to register pfcp netdev %d\n", err);
goto exit_del_pfcp_sock;
}
pn = net_generic(dev_net(dev), pfcp_net_id);
list_add_rcu(&pfcp->list, &pn->pfcp_dev_list);
netdev_dbg(dev, "registered new PFCP interface\n");
return 0;
exit_del_pfcp_sock:
pfcp_del_sock(pfcp);
exit_err:
pfcp->net = NULL;
return err;
}
static void pfcp_dellink(struct net_device *dev, struct list_head *head)
{
struct pfcp_dev *pfcp = netdev_priv(dev);
list_del_rcu(&pfcp->list);
unregister_netdevice_queue(dev, head);
}
static struct rtnl_link_ops pfcp_link_ops __read_mostly = {
.kind = "pfcp",
.priv_size = sizeof(struct pfcp_dev),
.setup = pfcp_link_setup,
.newlink = pfcp_newlink,
.dellink = pfcp_dellink,
};
static int __net_init pfcp_net_init(struct net *net)
{
struct pfcp_net *pn = net_generic(net, pfcp_net_id);
INIT_LIST_HEAD(&pn->pfcp_dev_list);
return 0;
}
static void __net_exit pfcp_net_exit(struct net *net)
{
struct pfcp_net *pn = net_generic(net, pfcp_net_id);
struct pfcp_dev *pfcp;
LIST_HEAD(list);
rtnl_lock();
list_for_each_entry(pfcp, &pn->pfcp_dev_list, list)
pfcp_dellink(pfcp->dev, &list);
unregister_netdevice_many(&list);
rtnl_unlock();
}
static struct pernet_operations pfcp_net_ops = {
.init = pfcp_net_init,
.exit = pfcp_net_exit,
.id = &pfcp_net_id,
.size = sizeof(struct pfcp_net),
};
static int __init pfcp_init(void)
{
int err;
err = register_pernet_subsys(&pfcp_net_ops);
if (err)
goto exit_err;
err = rtnl_link_register(&pfcp_link_ops);
if (err)
goto exit_unregister_subsys;
return 0;
exit_unregister_subsys:
unregister_pernet_subsys(&pfcp_net_ops);
exit_err:
pr_err("loading PFCP module failed: err %d\n", err);
return err;
}
late_initcall(pfcp_init);
static void __exit pfcp_exit(void)
{
rtnl_link_unregister(&pfcp_link_ops);
unregister_pernet_subsys(&pfcp_net_ops);
pr_info("PFCP module unloaded\n");
}
module_exit(pfcp_exit);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Wojciech Drewek <wojciech.drewek@intel.com>");
MODULE_DESCRIPTION("Interface driver for PFCP encapsulated traffic");
MODULE_ALIAS_RTNL_LINK("pfcp");
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