include/net/pfcp.h

   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 */
  19 struct 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 */
  34 struct pfcphdr_node {
  35         u8      seq_number[3];
  36         u8      reserved;
  37 };
  38
  39 /* PFCP session related messages */
  40 struct 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
  54 struct pfcp_metadata {
  55         u8 type;
  56         __be64 seid;
  57 } __packed;
  58
  59 enum {
  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
  69 static inline struct pfcphdr *pfcp_hdr(struct sk_buff *skb)
  70 {
  71         return (struct pfcphdr *)(udp_hdr(skb) + 1);
  72 }
  73
  74 static inline struct pfcphdr_node *pfcp_hdr_node(struct sk_buff *skb)
  75 {
  76         return (struct pfcphdr_node *)(pfcp_hdr(skb) + 1);
  77 }
  78
  79 static inline struct pfcphdr_session *pfcp_hdr_session(struct sk_buff *skb)
  80 {
  81         return (struct pfcphdr_session *)(pfcp_hdr(skb) + 1);
  82 }
  83
  84 static 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