From 3afb00d3f86d3d924f88b56fa8285d4e9db85852 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Wed, 7 Aug 2024 15:17:52 +0200 Subject: Merging upstream version 6.10.3. Signed-off-by: Daniel Baumann --- drivers/net/pfcp.c | 301 +++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 301 insertions(+) create mode 100644 drivers/net/pfcp.c (limited to 'drivers/net/pfcp.c') diff --git a/drivers/net/pfcp.c b/drivers/net/pfcp.c new file mode 100644 index 0000000000..69434fd13f --- /dev/null +++ b/drivers/net/pfcp.c @@ -0,0 +1,301 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * PFCP according to 3GPP TS 29.244 + * + * Copyright (C) 2022, Intel Corporation. + */ + +#include +#include +#include +#include +#include + +#include +#include +#include + +struct pfcp_dev { + struct list_head list; + + struct socket *sock; + struct net_device *dev; + struct net *net; + + struct gro_cells gro_cells; +}; + +static unsigned int pfcp_net_id __read_mostly; + +struct pfcp_net { + struct list_head pfcp_dev_list; +}; + +static void +pfcp_session_recv(struct pfcp_dev *pfcp, struct sk_buff *skb, + struct pfcp_metadata *md) +{ + struct pfcphdr_session *unparsed = pfcp_hdr_session(skb); + + md->seid = unparsed->seid; + md->type = PFCP_TYPE_SESSION; +} + +static void +pfcp_node_recv(struct pfcp_dev *pfcp, struct sk_buff *skb, + struct pfcp_metadata *md) +{ + md->type = PFCP_TYPE_NODE; +} + +static int pfcp_encap_recv(struct sock *sk, struct sk_buff *skb) +{ + IP_TUNNEL_DECLARE_FLAGS(flags) = { }; + struct metadata_dst *tun_dst; + struct pfcp_metadata *md; + struct pfcphdr *unparsed; + struct pfcp_dev *pfcp; + + if (unlikely(!pskb_may_pull(skb, PFCP_HLEN))) + goto drop; + + pfcp = rcu_dereference_sk_user_data(sk); + if (unlikely(!pfcp)) + goto drop; + + unparsed = pfcp_hdr(skb); + + ip_tunnel_flags_zero(flags); + tun_dst = udp_tun_rx_dst(skb, sk->sk_family, flags, 0, + sizeof(*md)); + if (unlikely(!tun_dst)) + goto drop; + + md = ip_tunnel_info_opts(&tun_dst->u.tun_info); + if (unlikely(!md)) + goto drop; + + if (unparsed->flags & PFCP_SEID_FLAG) + pfcp_session_recv(pfcp, skb, md); + else + pfcp_node_recv(pfcp, skb, md); + + __set_bit(IP_TUNNEL_PFCP_OPT_BIT, tun_dst->u.tun_info.key.tun_flags); + tun_dst->u.tun_info.options_len = sizeof(*md); + + if (unlikely(iptunnel_pull_header(skb, PFCP_HLEN, skb->protocol, + !net_eq(sock_net(sk), + dev_net(pfcp->dev))))) + goto drop; + + skb_dst_set(skb, (struct dst_entry *)tun_dst); + + skb_reset_network_header(skb); + skb_reset_mac_header(skb); + skb->dev = pfcp->dev; + + gro_cells_receive(&pfcp->gro_cells, skb); + + return 0; +drop: + kfree_skb(skb); + return 0; +} + +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); + + gro_cells_destroy(&pfcp->gro_cells); + pfcp_del_sock(pfcp); +} + +static int pfcp_dev_init(struct net_device *dev) +{ + struct pfcp_dev *pfcp = netdev_priv(dev); + + pfcp->dev = dev; + + return gro_cells_init(&pfcp->gro_cells, dev); +} + +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); + + tuncfg.sk_user_data = pfcp; + tuncfg.encap_rcv = pfcp_encap_recv; + tuncfg.encap_type = 1; + + 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 "); +MODULE_DESCRIPTION("Interface driver for PFCP encapsulated traffic"); +MODULE_ALIAS_RTNL_LINK("pfcp"); -- cgit v1.2.3