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Open Menu /tools/testing/selftests/bpf/verifier/event_output.c 
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/* instructions used to output a skb based software event, produced
 * from code snippet:
 * struct TMP {
 *  uint64_t tmp;
 * } tt;
 * tt.tmp = 5;
 * bpf_perf_event_output(skb, &connection_tracking_event_map, 0,
 *			 &tt, sizeof(tt));
 * return 1;
 *
 * the bpf assembly from llvm is:
 *        0:       b7 02 00 00 05 00 00 00         r2 = 5
 *        1:       7b 2a f8 ff 00 00 00 00         *(u64 *)(r10 - 8) = r2
 *        2:       bf a4 00 00 00 00 00 00         r4 = r10
 *        3:       07 04 00 00 f8 ff ff ff         r4 += -8
 *        4:       18 02 00 00 00 00 00 00 00 00 00 00 00 00 00 00    r2 = 0ll
 *        6:       b7 03 00 00 00 00 00 00         r3 = 0
 *        7:       b7 05 00 00 08 00 00 00         r5 = 8
 *        8:       85 00 00 00 19 00 00 00         call 25
 *        9:       b7 00 00 00 01 00 00 00         r0 = 1
 *       10:       95 00 00 00 00 00 00 00         exit
 *
 *     The reason I put the code here instead of fill_helpers is that map fixup
 *     is against the insns, instead of filled prog.
 */

#define __PERF_EVENT_INSNS__					\
	BPF_MOV64_IMM(BPF_REG_2, 5),				\
	BPF_STX_MEM(BPF_DW, BPF_REG_10, BPF_REG_2, -8),		\
	BPF_MOV64_REG(BPF_REG_4, BPF_REG_10),			\
	BPF_ALU64_IMM(BPF_ADD, BPF_REG_4, -8),			\
	BPF_LD_MAP_FD(BPF_REG_2, 0),				\
	BPF_MOV64_IMM(BPF_REG_3, 0),				\
	BPF_MOV64_IMM(BPF_REG_5, 8),				\
	BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0,		\
		     BPF_FUNC_perf_event_output),		\
	BPF_MOV64_IMM(BPF_REG_0, 1),				\
	BPF_EXIT_INSN(),
{
	"perfevent for sockops",
	.insns = { __PERF_EVENT_INSNS__ },
	.prog_type = BPF_PROG_TYPE_SOCK_OPS,
	.fixup_map_event_output = { 4 },
	.result = ACCEPT,
	.retval = 1,
},
{
	"perfevent for tc",
	.insns =  { __PERF_EVENT_INSNS__ },
	.prog_type = BPF_PROG_TYPE_SCHED_CLS,
	.fixup_map_event_output = { 4 },
	.result = ACCEPT,
	.retval = 1,
},
{
	"perfevent for lwt out",
	.insns =  { __PERF_EVENT_INSNS__ },
	.prog_type = BPF_PROG_TYPE_LWT_OUT,
	.fixup_map_event_output = { 4 },
	.result = ACCEPT,
	.retval = 1,
},
{
	"perfevent for xdp",
	.insns =  { __PERF_EVENT_INSNS__ },
	.prog_type = BPF_PROG_TYPE_XDP,
	.fixup_map_event_output = { 4 },
	.result = ACCEPT,
	.retval = 1,
},
{
	"perfevent for socket filter",
	.insns =  { __PERF_EVENT_INSNS__ },
	.prog_type = BPF_PROG_TYPE_SOCKET_FILTER,
	.fixup_map_event_output = { 4 },
	.result = ACCEPT,
	.retval = 1,
},
{
	"perfevent for sk_skb",
	.insns =  { __PERF_EVENT_INSNS__ },
	.prog_type = BPF_PROG_TYPE_SK_SKB,
	.fixup_map_event_output = { 4 },
	.result = ACCEPT,
	.retval = 1,
},
{
	"perfevent for cgroup skb",
	.insns =  { __PERF_EVENT_INSNS__ },
	.prog_type = BPF_PROG_TYPE_CGROUP_SKB,
	.fixup_map_event_output = { 4 },
	.result = ACCEPT,
	.retval = 1,
},