tools/testing/selftests/bpf/verifier/event_output.c

   1 /* instructions used to output a skb based software event, produced
   2  * from code snippet:
   3  * struct TMP {
   4  *  uint64_t tmp;
   5  * } tt;
   6  * tt.tmp = 5;
   7  * bpf_perf_event_output(skb, &connection_tracking_event_map, 0,
   8  *                       &tt, sizeof(tt));
   9  * return 1;
  10  *
  11  * the bpf assembly from llvm is:
  12  *        0:       b7 02 00 00 05 00 00 00         r2 = 5
  13  *        1:       7b 2a f8 ff 00 00 00 00         *(u64 *)(r10 - 8) = r2
  14  *        2:       bf a4 00 00 00 00 00 00         r4 = r10
  15  *        3:       07 04 00 00 f8 ff ff ff         r4 += -8
  16  *        4:       18 02 00 00 00 00 00 00 00 00 00 00 00 00 00 00    r2 = 0ll
  17  *        6:       b7 03 00 00 00 00 00 00         r3 = 0
  18  *        7:       b7 05 00 00 08 00 00 00         r5 = 8
  19  *        8:       85 00 00 00 19 00 00 00         call 25
  20  *        9:       b7 00 00 00 01 00 00 00         r0 = 1
  21  *       10:       95 00 00 00 00 00 00 00         exit
  22  *
  23  *     The reason I put the code here instead of fill_helpers is that map fixup
  24  *     is against the insns, instead of filled prog.
  25  */
  26
  27 #define __PERF_EVENT_INSNS__                                    \
  28         BPF_MOV64_IMM(BPF_REG_2, 5),                            \
  29         BPF_STX_MEM(BPF_DW, BPF_REG_10, BPF_REG_2, -8),         \
  30         BPF_MOV64_REG(BPF_REG_4, BPF_REG_10),                   \
  31         BPF_ALU64_IMM(BPF_ADD, BPF_REG_4, -8),                  \
  32         BPF_LD_MAP_FD(BPF_REG_2, 0),                            \
  33         BPF_MOV64_IMM(BPF_REG_3, 0),                            \
  34         BPF_MOV64_IMM(BPF_REG_5, 8),                            \
  35         BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0,               \
  36                      BPF_FUNC_perf_event_output),               \
  37         BPF_MOV64_IMM(BPF_REG_0, 1),                            \
  38         BPF_EXIT_INSN(),
  39 {
  40         "perfevent for sockops",
  41         .insns = { __PERF_EVENT_INSNS__ },
  42         .prog_type = BPF_PROG_TYPE_SOCK_OPS,
  43         .fixup_map_event_output = { 4 },
  44         .result = ACCEPT,
  45         .retval = 1,
  46 },
  47 {
  48         "perfevent for tc",
  49         .insns =  { __PERF_EVENT_INSNS__ },
  50         .prog_type = BPF_PROG_TYPE_SCHED_CLS,
  51         .fixup_map_event_output = { 4 },
  52         .result = ACCEPT,
  53         .retval = 1,
  54 },
  55 {
  56         "perfevent for lwt out",
  57         .insns =  { __PERF_EVENT_INSNS__ },
  58         .prog_type = BPF_PROG_TYPE_LWT_OUT,
  59         .fixup_map_event_output = { 4 },
  60         .result = ACCEPT,
  61         .retval = 1,
  62 },
  63 {
  64         "perfevent for xdp",
  65         .insns =  { __PERF_EVENT_INSNS__ },
  66         .prog_type = BPF_PROG_TYPE_XDP,
  67         .fixup_map_event_output = { 4 },
  68         .result = ACCEPT,
  69         .retval = 1,
  70 },
  71 {
  72         "perfevent for socket filter",
  73         .insns =  { __PERF_EVENT_INSNS__ },
  74         .prog_type = BPF_PROG_TYPE_SOCKET_FILTER,
  75         .fixup_map_event_output = { 4 },
  76         .result = ACCEPT,
  77         .retval = 1,
  78 },
  79 {
  80         "perfevent for sk_skb",
  81         .insns =  { __PERF_EVENT_INSNS__ },
  82         .prog_type = BPF_PROG_TYPE_SK_SKB,
  83         .fixup_map_event_output = { 4 },
  84         .result = ACCEPT,
  85         .retval = 1,
  86 },
  87 {
  88         "perfevent for cgroup skb",
  89         .insns =  { __PERF_EVENT_INSNS__ },
  90         .prog_type = BPF_PROG_TYPE_CGROUP_SKB,
  91         .fixup_map_event_output = { 4 },
  92         .result = ACCEPT,
  93         .retval = 1,
  94 },