BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_map_lookup_elem), /* 函数的返回值为value所在内存的地址,放在R0寄存器中*/ BPF_JMP_IMM(BPF_JEQ, BPF_REG_0, 0, 2), /* 如果返回的内存地址为0,则向下跳两个指令 */ BPF_MOV64_IMM(BPF_REG_1, 1), /* r1 = 1 */ BPF_RAW...
其中,BPF_CALL为真正的BPF调用指令,dst_reg为目的寄存器,sec_reg为源寄存器,off为偏移量,imm为立即数。 进行替换后得到如图示结构体,code表示操作码,在内核中分别定义为 #defineBPF_JMP 0x05 #defineBPF_CALL 0x80 按位与后得到code的值为85,目的寄存器、源寄存器和off均被初始化为0,imm为枚举结构中的整型值...
bf a1 00 00 00 00 00 00 r1 = r10 8: 07 01 00 00 f0 ff ff ff r1 += -0x10 ; bpf_printk("Hello world!\n"); 9: b7 02 00 00 0e 00 00 00 r2 = 0xe 10: 85 00 00 00 06 00 00 00 call 0x6 ; return 0; 11: b7 00 00 00 00 00 00 00 r0 = 0x0 12: 95 00 ...
目前支持以下类型的BPF代码: static int __init register_kprobe_prog_ops(void){bpf_register_prog_type(&kprobe_tl);bpf_register_prog_type(&tracepoint_tl);bpf_register_prog_type(&perf_event_tl);return 0;}static int __init register_sk_filter_ops(void){bpf_register_prog_type(&sk_filter_type...
static long (*bpf_tail_call)(void *ctx, void *prog_array_map, __u32 index) = (void *) 12; ^ /root/core/linux-5.16.10/samples/bpf/bpftool//bootstrap/libbpf//include/bpf/bpf_helper_defs.h:350:58: error: unknown type name '__u32' ...
这里会报错的,可以自己调大一点看看charcomm_name[30];bpf_get_current_comm(comm_name,sizeof(comm_name));// 调用失败以后会直接 fall throughbpf_tail_call(ctx, &progs, this_syscall);charfmt[] ="syscall=%d common=%s\n";bpf_trace_printk(fmt,sizeof(fmt), this_syscall, comm_name);return0...
/root/core/linux-5.16.10/samples/bpf/bpftool//bootstrap/libbpf//include/bpf/bpf_helper_defs.h:322:63:error:unknowntype name'__u32'staticlong(*bpf_tail_call)(void*ctx,void*prog_array_map,__u32 index)=(void*)12;^/root/core/linux-5.16.10/samples/bpf/bpftool//bootstrap/libbpf//inclu...
lbcBase import ClbcBase, CexecCmd //import pylcc base库bpfProg = r"""struct data_t { int cpu; int type; // 0: irq, 1:sirq u32 stack_id; u64 delayed;};LBC_PERF_OUTPUT(e_out, struct data_t, 128); //定义perf event output array mapLBC_STACK(call_stack,...
return 0; value = bpf_map_lookup_elem(&my_map, &index); if (value) __sync_fetch_and_add(value, skb->len); return 0; } char _license[] SEC("license") = "GPL"; int main(int ac, char **argv) { struct bpf_object *obj; ...
bpfPog=r"""#include "lbc.h"LBC_PERF_OUTPUT(e_out,structdata_t,128);LBC_HASH(pid_cnt,u32,u32,1024);LBC_STACK(call_stack,32); 3)xx.py 编写,只需要这一步,程序就可以运行起来。用户关注从内核收到的数据进行分析就可以: importtimefrompylcc.lbcBaseimportClbcBaseclassPingtrace(ClbcBase):de...