@@ -290,6 +290,19 @@ config GTP
To compile this drivers as a module, choose M here: the module
will be called gtp.
+config PFCP
+ tristate "Packet Forwarding Control Protocol (PFCP)"
+ depends on INET
+ select NET_UDP_TUNNEL
+ help
+ This allows one to create PFCP virtual interfaces that allows to
+ set up software and hardware offload of PFCP packets.
+ Note that this module does not support PFCP protocol in the kernel space.
+ There is no support for parsing any PFCP messages.
+
+ To compile this drivers as a module, choose M here: the module
+ will be called pfcp.
+
config AMT
tristate "Automatic Multicast Tunneling (AMT)"
depends on INET && IP_MULTICAST
@@ -38,6 +38,7 @@ obj-$(CONFIG_GENEVE) += geneve.o
obj-$(CONFIG_BAREUDP) += bareudp.o
obj-$(CONFIG_GTP) += gtp.o
obj-$(CONFIG_NLMON) += nlmon.o
+obj-$(CONFIG_PFCP) += pfcp.o
obj-$(CONFIG_NET_VRF) += vrf.o
obj-$(CONFIG_VSOCKMON) += vsockmon.o
obj-$(CONFIG_MHI_NET) += mhi_net.o
new file mode 100644
@@ -0,0 +1,17 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _PFCP_H_
+#define _PFCP_H_
+
+#include <linux/netdevice.h>
+#include <linux/string.h>
+#include <linux/types.h>
+
+#define PFCP_PORT 8805
+
+static inline bool netif_is_pfcp(const struct net_device *dev)
+{
+ return dev->rtnl_link_ops &&
+ !strcmp(dev->rtnl_link_ops->kind, "pfcp");
+}
+
+#endif
new file mode 100644
@@ -0,0 +1,223 @@
+// 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");