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/* Common BPF helpers to be used by all BPF programs loaded by Android */
#include <linux/bpf.h>
#include <stdbool.h>
#include <stdint.h>
/* place things in different elf sections */
#define SEC(NAME) __attribute__((section(NAME), used))
/*
* Helper functions called from eBPF programs written in C. These are
* implemented in the kernel sources.
*/
/* generic functions */
static void* (*bpf_map_lookup_elem)(void* map, void* key) = (void*) BPF_FUNC_map_lookup_elem;
static int (*bpf_map_update_elem)(void* map, void* key, void* value,
unsigned long long flags) = (void*) BPF_FUNC_map_update_elem;
static int (*bpf_map_delete_elem)(void* map, void* key) = (void*) BPF_FUNC_map_delete_elem;
static int (*bpf_probe_read)(void* dst, int size, void* unsafe_ptr) = (void*) BPF_FUNC_probe_read;
static unsigned long long (*bpf_ktime_get_ns)(void) = (void*) BPF_FUNC_ktime_get_ns;
static int (*bpf_trace_printk)(const char* fmt, int fmt_size, ...) = (void*) BPF_FUNC_trace_printk;
static unsigned long long (*bpf_get_current_pid_tgid)(void) = (void*) BPF_FUNC_get_current_pid_tgid;
static unsigned long long (*bpf_get_current_uid_gid)(void) = (void*) BPF_FUNC_get_current_uid_gid;
static unsigned long long (*bpf_get_smp_processor_id)(void) = (void*) BPF_FUNC_get_smp_processor_id;
/* networking */
static uint64_t (*bpf_get_socket_cookie)(struct __sk_buff* skb) = (void*)BPF_FUNC_get_socket_cookie;
static uint32_t (*bpf_get_socket_uid)(struct __sk_buff* skb) = (void*)BPF_FUNC_get_socket_uid;
static int (*bpf_skb_load_bytes)(struct __sk_buff* skb, int off, void* to,
int len) = (void*)BPF_FUNC_skb_load_bytes;
static int (*bpf_skb_change_proto)(struct __sk_buff* skb, __be16 proto,
__u64 flags) = (void*)BPF_FUNC_skb_change_proto;
static int (*bpf_l3_csum_replace)(struct __sk_buff* skb, __u32 offset, __u64 from, __u64 to,
__u64 flags) = (void*)BPF_FUNC_l3_csum_replace;
static int (*bpf_l4_csum_replace)(struct __sk_buff* skb, __u32 offset, __u64 from, __u64 to,
__u64 flags) = (void*)BPF_FUNC_l4_csum_replace;
static int (*bpf_redirect)(__u32 ifindex, __u64 flags) = (void*)BPF_FUNC_redirect;
/*
* Map structure to be used by Android eBPF C programs. The Android eBPF loader
* uses this structure from eBPF object to create maps at boot time.
*
* The eBPF C program should define structure in the maps section using
* SEC("maps") otherwise it will be ignored by the eBPF loader.
*
* For example:
* struct bpf_map_def SEC("maps") mymap { .type=... , .key_size=... }
*/
struct bpf_map_def {
unsigned int type;
unsigned int key_size;
unsigned int value_size;
unsigned int max_entries;
unsigned int map_flags;
unsigned int pad1;
unsigned int pad2;
};
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