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| #define _GNU_SOURCE
#include <errno.h>
#include <stdlib.h>
#include <sys/syscall.h>
#include <stdio.h>
#include <stdint.h>
#include <string.h>
#include <unistd.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <stdio.h>
#include <linux/bpf.h>
#define BPF_STX_MEM(SIZE, DST, SRC, OFF) \
((struct bpf_insn) { \
.code = BPF_STX | BPF_SIZE(SIZE) | BPF_MEM, \
.dst_reg = DST, \
.src_reg = SRC, \
.off = OFF, \
.imm = 0 })
#define BPF_MOV64_REG(DST, SRC) \
((struct bpf_insn) { \
.code = BPF_ALU64 | BPF_MOV | BPF_X, \
.dst_reg = DST, \
.src_reg = SRC, \
.off = 0, \
.imm = 0 })
#define BPF_ALU64_IMM(OP, DST, IMM) \
((struct bpf_insn) { \
.code = BPF_ALU64 | BPF_OP(OP) | BPF_K, \
.dst_reg = DST, \
.src_reg = 0, \
.off = 0, \
.imm = IMM })
#define BPF_LD_IMM64_RAW_FULL(DST, SRC, OFF1, OFF2, IMM1, IMM2) \
((struct bpf_insn) { \
.code = BPF_LD | BPF_DW | BPF_IMM, \
.dst_reg = DST, \
.src_reg = SRC, \
.off = OFF1, \
.imm = IMM1 }), \
((struct bpf_insn) { \
.code = 0, /* zero is reserved opcode */ \
.dst_reg = 0, \
.src_reg = 0, \
.off = OFF2, \
.imm = IMM2 })
/* pseudo BPF_LD_IMM64 insn used to refer to process-local map_fd */
#define BPF_LD_MAP_FD(DST, MAP_FD) \
BPF_LD_IMM64_RAW_FULL(DST, BPF_PSEUDO_MAP_FD, 0, 0, \
MAP_FD, 0)
#define BPF_EMIT_CALL(FUNC) \
((struct bpf_insn) { \
.code = BPF_JMP | BPF_CALL, \
.dst_reg = 0, \
.src_reg = 0, \
.off = 0, \
.imm = ((FUNC) - BPF_FUNC_unspec) })
#define BPF_EXIT_INSN() \
((struct bpf_insn) { \
.code = BPF_JMP | BPF_EXIT, \
.dst_reg = 0, \
.src_reg = 0, \
.off = 0, \
.imm = 0 })
#define BPF_MOV64_IMM(DST, IMM) \
((struct bpf_insn) { \
.code = BPF_ALU64 | BPF_MOV | BPF_K, \
.dst_reg = DST, \
.src_reg = 0, \
.off = 0, \
.imm = IMM })
#define offsetof(type, member) __builtin_offsetof(type, member)
#define ARRAY_SIZE(x) (sizeof(x) / sizeof(*(x)))
static inline __u64 ptr_to_u64(const void *ptr)
{
return (__u64) (unsigned long) ptr;
}
int bpf_map_create(uint32_t map_type, uint32_t key_size, uint32_t value_size, unsigned int max_entries, unsigned int flags) {
union bpf_attr attr = {.map_type = map_type,
.key_size = key_size,
.value_size = value_size,
.max_entries = max_entries,
};
if (flags != -1) {
attr.map_flags = flags;
}
return syscall(SYS_bpf, BPF_MAP_CREATE, &attr, 0x40);
}
int link_create(int prog_fd, int target_fd, uint32_t attach_type, uint32_t flags, uint32_t target_btf_id)
{
union bpf_attr attr = {
.link_create.prog_fd = prog_fd,
.link_create.target_fd = target_fd,
.link_create.attach_type = attach_type,
.link_create.flags = 8,
};
return syscall(SYS_bpf, BPF_LINK_CREATE, &attr, sizeof(attr.link_create));
}
// loads a prog and returns the FD
int load_prog(struct bpf_insn *instructions, size_t insn_count)
{
printf("%zu\n", insn_count);
unsigned char log_buf[1000000] = {};
memset(log_buf, 0, 1000000);
union bpf_attr attr ;
attr.prog_type = BPF_PROG_TYPE_TRACING;
attr.insns = (uint64_t)instructions;
attr.insn_cnt = insn_count;
attr.license = (uint64_t) "GPL";
attr.log_size = sizeof(log_buf);
attr.log_buf = (uint64_t)log_buf;
attr.log_level = 3;
attr.attach_btf_id = 116106;///*btf_id*/;
attr.expected_attach_type = BPF_TRACE_FENTRY;
// load the BPF program
int prog_fd = syscall(SYS_bpf, BPF_PROG_LOAD, &attr, sizeof(attr));
printf("prog_fd = %d\n", prog_fd);
if (prog_fd < 0) {
for (int i = 0; i < sizeof(log_buf) && log_buf[i] != '\0'; i++) {
if (log_buf[i] != '\n') {
printf("%c",log_buf[i]);
} else {
printf("\n");
}
}
printf("%s\n", strerror(errno));
// printf("could load program\n");
return -1;
}
return prog_fd;
}
int load_run_bpf_insn()
{
int map_id=bpf_map_create(BPF_MAP_TYPE_BLOOM_FILTER, 0, 4, 32, -1);
printf("create map map_30: %d\n", map_id);
struct bpf_insn prog[] = {
BPF_STX_MEM(BPF_DW, BPF_REG_10, BPF_REG_1, 65528),
BPF_STX_MEM(BPF_DW, BPF_REG_10, BPF_REG_1, 65520),
BPF_STX_MEM(BPF_DW, BPF_REG_10, BPF_REG_1, 65512),
BPF_STX_MEM(BPF_DW, BPF_REG_10, BPF_REG_1, 65504),
BPF_STX_MEM(BPF_DW, BPF_REG_10, BPF_REG_1, 65496),
BPF_STX_MEM(BPF_DW, BPF_REG_10, BPF_REG_1, 65488),
BPF_MOV64_REG(BPF_REG_2, BPF_REG_10),
BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, 0xffffffd0),
BPF_LD_MAP_FD(BPF_REG_1, map_id),
BPF_EMIT_CALL(BPF_FUNC_map_peek_elem),
BPF_MOV64_IMM(BPF_REG_0, 0x0),
BPF_EXIT_INSN()
};
int prog_fd = load_prog(prog, /*prog_len=*/sizeof(prog) / sizeof(prog[0]));
if ( prog_fd < 0) {
printf("Could not load program\n");
return -1;
}
int link = link_create(prog_fd, 0, BPF_TRACE_FENTRY, 0, 0);
int link2 = link_create(prog_fd, 0, BPF_TRACE_FENTRY, 0, 0);
printf("link created: %d\n", link);
printf("link2 created: %d\n", link2);
if(link2<0){
perror("link2 create failed");
int err=errno;
printf("error code: %d\n", err);
}
}
int main(int argc, char **argv)
{
load_run_bpf_insn();
}
|