95 lines
2.6 KiB
C
95 lines
2.6 KiB
C
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/* instructions used to output a skb based software event, produced
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* from code snippet:
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* struct TMP {
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* uint64_t tmp;
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* } tt;
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* tt.tmp = 5;
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* bpf_perf_event_output(skb, &connection_tracking_event_map, 0,
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* &tt, sizeof(tt));
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* return 1;
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*
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* the bpf assembly from llvm is:
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* 0: b7 02 00 00 05 00 00 00 r2 = 5
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* 1: 7b 2a f8 ff 00 00 00 00 *(u64 *)(r10 - 8) = r2
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* 2: bf a4 00 00 00 00 00 00 r4 = r10
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* 3: 07 04 00 00 f8 ff ff ff r4 += -8
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* 4: 18 02 00 00 00 00 00 00 00 00 00 00 00 00 00 00 r2 = 0ll
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* 6: b7 03 00 00 00 00 00 00 r3 = 0
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* 7: b7 05 00 00 08 00 00 00 r5 = 8
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* 8: 85 00 00 00 19 00 00 00 call 25
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* 9: b7 00 00 00 01 00 00 00 r0 = 1
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* 10: 95 00 00 00 00 00 00 00 exit
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*
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* The reason I put the code here instead of fill_helpers is that map fixup
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* is against the insns, instead of filled prog.
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*/
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#define __PERF_EVENT_INSNS__ \
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BPF_MOV64_IMM(BPF_REG_2, 5), \
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BPF_STX_MEM(BPF_DW, BPF_REG_10, BPF_REG_2, -8), \
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BPF_MOV64_REG(BPF_REG_4, BPF_REG_10), \
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BPF_ALU64_IMM(BPF_ADD, BPF_REG_4, -8), \
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BPF_LD_MAP_FD(BPF_REG_2, 0), \
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BPF_MOV64_IMM(BPF_REG_3, 0), \
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BPF_MOV64_IMM(BPF_REG_5, 8), \
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BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, \
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BPF_FUNC_perf_event_output), \
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BPF_MOV64_IMM(BPF_REG_0, 1), \
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BPF_EXIT_INSN(),
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{
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"perfevent for sockops",
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.insns = { __PERF_EVENT_INSNS__ },
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.prog_type = BPF_PROG_TYPE_SOCK_OPS,
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.fixup_map_event_output = { 4 },
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.result = ACCEPT,
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.retval = 1,
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},
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{
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"perfevent for tc",
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.insns = { __PERF_EVENT_INSNS__ },
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.prog_type = BPF_PROG_TYPE_SCHED_CLS,
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.fixup_map_event_output = { 4 },
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.result = ACCEPT,
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.retval = 1,
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},
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{
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"perfevent for lwt out",
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.insns = { __PERF_EVENT_INSNS__ },
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.prog_type = BPF_PROG_TYPE_LWT_OUT,
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.fixup_map_event_output = { 4 },
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.result = ACCEPT,
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.retval = 1,
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},
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{
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"perfevent for xdp",
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.insns = { __PERF_EVENT_INSNS__ },
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.prog_type = BPF_PROG_TYPE_XDP,
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.fixup_map_event_output = { 4 },
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.result = ACCEPT,
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.retval = 1,
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},
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{
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"perfevent for socket filter",
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.insns = { __PERF_EVENT_INSNS__ },
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.prog_type = BPF_PROG_TYPE_SOCKET_FILTER,
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.fixup_map_event_output = { 4 },
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.result = ACCEPT,
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.retval = 1,
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},
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{
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"perfevent for sk_skb",
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.insns = { __PERF_EVENT_INSNS__ },
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.prog_type = BPF_PROG_TYPE_SK_SKB,
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.fixup_map_event_output = { 4 },
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.result = ACCEPT,
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.retval = 1,
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},
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{
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"perfevent for cgroup skb",
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.insns = { __PERF_EVENT_INSNS__ },
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.prog_type = BPF_PROG_TYPE_CGROUP_SKB,
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.fixup_map_event_output = { 4 },
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.result = ACCEPT,
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.retval = 1,
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},
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