0456ea170c
Currently the following prog types don't fall back to bpf_base_func_proto() (instead they have cgroup_base_func_proto which has a limited set of helpers from bpf_base_func_proto): * BPF_PROG_TYPE_CGROUP_DEVICE * BPF_PROG_TYPE_CGROUP_SYSCTL * BPF_PROG_TYPE_CGROUP_SOCKOPT I don't see any specific reason why we shouldn't use bpf_base_func_proto(), every other type of program (except bpf-lirc and, understandably, tracing) use it, so let's fall back to bpf_base_func_proto for those prog types as well. This basically boils down to adding access to the following helpers: * BPF_FUNC_get_prandom_u32 * BPF_FUNC_get_smp_processor_id * BPF_FUNC_get_numa_node_id * BPF_FUNC_tail_call * BPF_FUNC_ktime_get_ns * BPF_FUNC_spin_lock (CAP_SYS_ADMIN) * BPF_FUNC_spin_unlock (CAP_SYS_ADMIN) * BPF_FUNC_jiffies64 (CAP_SYS_ADMIN) I've also added bpf_perf_event_output() because it's really handy for logging and debugging. Signed-off-by: Stanislav Fomichev <sdf@google.com> Signed-off-by: Alexei Starovoitov <ast@kernel.org> Link: https://lore.kernel.org/bpf/20200420174610.77494-1-sdf@google.com
119 lines
3.2 KiB
C
119 lines
3.2 KiB
C
/* 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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{
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"perfevent for cgroup dev",
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.insns = { __PERF_EVENT_INSNS__ },
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.prog_type = BPF_PROG_TYPE_CGROUP_DEVICE,
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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 sysctl",
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.insns = { __PERF_EVENT_INSNS__ },
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.prog_type = BPF_PROG_TYPE_CGROUP_SYSCTL,
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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 sockopt",
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.insns = { __PERF_EVENT_INSNS__ },
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.prog_type = BPF_PROG_TYPE_CGROUP_SOCKOPT,
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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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