1/* SPDX-License-Identifier: GPL-2.0 */
 2#ifndef _PFCP_H_
 3#define _PFCP_H_
 4
 5#include <uapi/linux/if_ether.h>
 6#include <net/dst_metadata.h>
 7#include <linux/netdevice.h>
 8#include <uapi/linux/ipv6.h>
 9#include <net/udp_tunnel.h>
10#include <uapi/linux/udp.h>
11#include <uapi/linux/ip.h>
12#include <linux/string.h>
13#include <linux/types.h>
14#include <linux/bits.h>
15
16#define PFCP_PORT 8805
17
18/* PFCP protocol header */
19struct pfcphdr {
20	u8	flags;
21	u8	message_type;
22	__be16	message_length;
23};
24
25/* PFCP header flags */
26#define PFCP_SEID_FLAG		BIT(0)
27#define PFCP_MP_FLAG		BIT(1)
28
29#define PFCP_VERSION_MASK	GENMASK(4, 0)
30
31#define PFCP_HLEN (sizeof(struct udphdr) + sizeof(struct pfcphdr))
32
33/* PFCP node related messages */
34struct pfcphdr_node {
35	u8	seq_number[3];
36	u8	reserved;
37};
38
39/* PFCP session related messages */
40struct pfcphdr_session {
41	__be64	seid;
42	u8	seq_number[3];
43#ifdef __LITTLE_ENDIAN_BITFIELD
44	u8	message_priority:4,
45		reserved:4;
46#elif defined(__BIG_ENDIAN_BITFIELD)
47	u8	reserved:4,
48		message_priprity:4;
49#else
50#error "Please fix <asm/byteorder>"
51#endif
52};
53
54struct pfcp_metadata {
55	u8 type;
56	__be64 seid;
57} __packed;
58
59enum {
60	PFCP_TYPE_NODE		= 0,
61	PFCP_TYPE_SESSION	= 1,
62};
63
64#define PFCP_HEADROOM (sizeof(struct iphdr) + sizeof(struct udphdr) + \
65		       sizeof(struct pfcphdr) + sizeof(struct ethhdr))
66#define PFCP6_HEADROOM (sizeof(struct ipv6hdr) + sizeof(struct udphdr) + \
67			sizeof(struct pfcphdr) + sizeof(struct ethhdr))
68
69static inline struct pfcphdr *pfcp_hdr(struct sk_buff *skb)
70{
71	return (struct pfcphdr *)(udp_hdr(skb) + 1);
72}
73
74static inline struct pfcphdr_node *pfcp_hdr_node(struct sk_buff *skb)
75{
76	return (struct pfcphdr_node *)(pfcp_hdr(skb) + 1);
77}
78
79static inline struct pfcphdr_session *pfcp_hdr_session(struct sk_buff *skb)
80{
81	return (struct pfcphdr_session *)(pfcp_hdr(skb) + 1);
82}
83
84static inline bool netif_is_pfcp(const struct net_device *dev)
85{
86	return dev->rtnl_link_ops &&
87	       !strcmp(dev->rtnl_link_ops->kind, "pfcp");
88}
89
90#endif