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#ifndef __BPF_API__
#define __BPF_API__
/* Note:
*
* This file can be included into eBPF kernel programs. It contains
* a couple of useful helper functions, map/section ABI (bpf_elf.h),
* misc macros and some eBPF specific LLVM built-ins.
*/
#include <stdint.h>
#include <linux/pkt_cls.h>
#include <linux/bpf.h>
#include <linux/filter.h>
#include <asm/byteorder.h>
#include "bpf_elf.h"
/** Misc macros. */
#ifndef __stringify
# define __stringify(X) #X
#endif
#ifndef __maybe_unused
# define __maybe_unused __attribute__((__unused__))
#endif
#ifndef offsetof
# define offsetof(TYPE, MEMBER) __builtin_offsetof(TYPE, MEMBER)
#endif
#ifndef likely
# define likely(X) __builtin_expect(!!(X), 1)
#endif
#ifndef unlikely
# define unlikely(X) __builtin_expect(!!(X), 0)
#endif
#ifndef htons
# define htons(X) __constant_htons((X))
#endif
#ifndef ntohs
# define ntohs(X) __constant_ntohs((X))
#endif
#ifndef htonl
# define htonl(X) __constant_htonl((X))
#endif
#ifndef ntohl
# define ntohl(X) __constant_ntohl((X))
#endif
/** Section helper macros. */
#ifndef __section
# define __section(NAME) \
__attribute__((section(NAME), used))
#endif
#ifndef __section_tail
# define __section_tail(ID, KEY) \
__section(__stringify(ID) "/" __stringify(KEY))
#endif
#ifndef __section_cls_entry
# define __section_cls_entry \
__section(ELF_SECTION_CLASSIFIER)
#endif
#ifndef __section_act_entry
# define __section_act_entry \
__section(ELF_SECTION_ACTION)
#endif
#ifndef __section_license
# define __section_license \
__section(ELF_SECTION_LICENSE)
#endif
#ifndef __section_maps
# define __section_maps \
__section(ELF_SECTION_MAPS)
#endif
/** Declaration helper macros. */
#ifndef BPF_LICENSE
# define BPF_LICENSE(NAME) \
char ____license[] __section_license = NAME
#endif
#ifndef __BPF_MAP
# define __BPF_MAP(NAME, TYPE, ID, SIZE_KEY, SIZE_VALUE, PIN, MAX_ELEM) \
struct bpf_elf_map __section_maps NAME = { \
.type = (TYPE), \
.id = (ID), \
.size_key = (SIZE_KEY), \
.size_value = (SIZE_VALUE), \
.pinning = (PIN), \
.max_elem = (MAX_ELEM), \
}
#endif
#ifndef BPF_HASH
# define BPF_HASH(NAME, ID, SIZE_KEY, SIZE_VALUE, PIN, MAX_ELEM) \
__BPF_MAP(NAME, BPF_MAP_TYPE_HASH, ID, SIZE_KEY, SIZE_VALUE, \
PIN, MAX_ELEM)
#endif
#ifndef BPF_ARRAY
# define BPF_ARRAY(NAME, ID, SIZE_VALUE, PIN, MAX_ELEM) \
__BPF_MAP(NAME, BPF_MAP_TYPE_ARRAY, ID, sizeof(uint32_t), \
SIZE_VALUE, PIN, MAX_ELEM)
#endif
#ifndef BPF_ARRAY2
# define BPF_ARRAY2(NAME, ID, PIN, MAX_ELEM) \
BPF_ARRAY(NAME, ID, sizeof(uint16_t), PIN, MAX_ELEM)
#endif
#ifndef BPF_ARRAY4
# define BPF_ARRAY4(NAME, ID, PIN, MAX_ELEM) \
BPF_ARRAY(NAME, ID, sizeof(uint32_t), PIN, MAX_ELEM)
#endif
#ifndef BPF_ARRAY8
# define BPF_ARRAY8(NAME, ID, PIN, MAX_ELEM) \
BPF_ARRAY(NAME, ID, sizeof(uint64_t), PIN, MAX_ELEM)
#endif
#ifndef BPF_PROG_ARRAY
# define BPF_PROG_ARRAY(NAME, ID, PIN, MAX_ELEM) \
__BPF_MAP(NAME, BPF_MAP_TYPE_PROG_ARRAY, ID, sizeof(uint32_t), \
sizeof(uint32_t), PIN, MAX_ELEM)
#endif
/** Classifier helper */
#ifndef BPF_H_DEFAULT
# define BPF_H_DEFAULT -1
#endif
/** BPF helper functions for tc. */
#ifndef BPF_FUNC
# define BPF_FUNC(NAME, ...) \
(* NAME)(__VA_ARGS__) __maybe_unused = (void *) BPF_FUNC_##NAME
#endif
/* Map access/manipulation */
static void *BPF_FUNC(map_lookup_elem, void *map, const void *key);
static int BPF_FUNC(map_update_elem, void *map, const void *key,
const void *value, uint32_t flags);
static int BPF_FUNC(map_delete_elem, void *map, const void *key);
/* Time access */
static uint64_t BPF_FUNC(ktime_get_ns);
/* Debugging */
static void BPF_FUNC(trace_printk, const char *fmt, int fmt_size, ...);
/* Random numbers */
static uint32_t BPF_FUNC(get_prandom_u32);
/* Tail calls */
static void BPF_FUNC(tail_call, struct __sk_buff *skb, void *map,
uint32_t index);
/* System helpers */
static uint32_t BPF_FUNC(get_smp_processor_id);
/* Packet misc meta data */
static uint32_t BPF_FUNC(get_cgroup_classid, struct __sk_buff *skb);
static uint32_t BPF_FUNC(get_route_realm, struct __sk_buff *skb);
/* Packet redirection */
static int BPF_FUNC(redirect, int ifindex, uint32_t flags);
static int BPF_FUNC(clone_redirect, struct __sk_buff *skb, int ifindex,
uint32_t flags);
/* Packet manipulation */
#define BPF_PSEUDO_HDR 0x10
#define BPF_HAS_PSEUDO_HDR(flags) ((flags) & BPF_PSEUDO_HDR)
#define BPF_HDR_FIELD_SIZE(flags) ((flags) & 0x0f)
static int BPF_FUNC(skb_store_bytes, struct __sk_buff *skb, uint32_t off,
void *from, uint32_t len, uint32_t flags);
static int BPF_FUNC(l3_csum_replace, struct __sk_buff *skb, uint32_t off,
uint32_t from, uint32_t to, uint32_t flags);
static int BPF_FUNC(l4_csum_replace, struct __sk_buff *skb, uint32_t off,
uint32_t from, uint32_t to, uint32_t flags);
/* Packet vlan encap/decap */
static int BPF_FUNC(skb_vlan_push, struct __sk_buff *skb, uint16_t proto,
uint16_t vlan_tci);
static int BPF_FUNC(skb_vlan_pop, struct __sk_buff *skb);
/* Packet tunnel encap/decap */
static int BPF_FUNC(skb_get_tunnel_key, struct __sk_buff *skb,
struct bpf_tunnel_key *to, uint32_t size, uint32_t flags);
static int BPF_FUNC(skb_set_tunnel_key, struct __sk_buff *skb,
struct bpf_tunnel_key *from, uint32_t size, uint32_t flags);
/** LLVM built-ins */
#ifndef lock_xadd
# define lock_xadd(ptr, val) ((void) __sync_fetch_and_add(ptr, val))
#endif
unsigned long long load_byte(void *skb, unsigned long long off)
asm ("llvm.bpf.load.byte");
unsigned long long load_half(void *skb, unsigned long long off)
asm ("llvm.bpf.load.half");
unsigned long long load_word(void *skb, unsigned long long off)
asm ("llvm.bpf.load.word");
#endif /* __BPF_API__ */
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