kvm_watcher:添加对容器的系统调用相关信息采集 #840
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,127 @@ | ||
| // Copyright 2023 The LMP Authors. | ||
| // | ||
| // Licensed under the Apache License, Version 2.0 (the "License"); | ||
| // you may not use this file except in compliance with the License. | ||
| // You may obtain a copy of the License at | ||
| // | ||
| // https://github.com/linuxkerneltravel/lmp/blob/develop/LICENSE | ||
| // | ||
| // Unless required by applicable law or agreed to in writing, software | ||
| // distributed under the License is distributed on an "AS IS" BASIS, | ||
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| // See the License for the specific language governing permissions and | ||
| // limitations under the License. | ||
| // | ||
| // author: [email protected] | ||
| // | ||
| // Kernel space BPF program used for counting container sys_entry/sys_exit info. | ||
|
|
||
| #ifndef __CONTAINER_H | ||
| #define __CONTAINER_H | ||
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|
||
| #include "common.h" | ||
| #include "vmlinux.h" | ||
| #include <bpf/bpf_helpers.h> | ||
| #include <bpf/bpf_core_read.h> | ||
| #include <bpf/bpf_tracing.h> | ||
| struct { | ||
| __uint(type,BPF_MAP_TYPE_HASH); | ||
| __uint(max_entries, 8192); | ||
| __type(key, pid_t); | ||
| __type(value, u64); | ||
| }time_info SEC(".maps"); | ||
| struct { | ||
| __uint(type,BPF_MAP_TYPE_HASH); | ||
| __uint(max_entries, 8192); | ||
| __type(key, pid_t); | ||
| __type(value, u64); | ||
| }id SEC(".maps"); | ||
| static int trace_container_sys_entry(struct trace_event_raw_sys_enter *args){ | ||
| u64 st = bpf_ktime_get_ns(); | ||
| pid_t pid = bpf_get_current_pid_tgid(); | ||
| u64 syscall_id = (u64)args->id; | ||
| bpf_map_update_elem(&time_info,&pid,&st,BPF_ANY); | ||
| bpf_map_update_elem(&id,&pid,&syscall_id,BPF_ANY); | ||
| return 0; | ||
| } | ||
| static int trace_container_sys_exit(struct trace_event_raw_sys_exit *args,void *rb,struct common_event *e){ | ||
| u64 exit_time = bpf_ktime_get_ns(); | ||
| pid_t pid = bpf_get_current_pid_tgid(); | ||
| //bpf_printk("pid=%15d\n",pid); | ||
| u64 delay,start_time,syscallid; | ||
| u64 *st = bpf_map_lookup_elem(&time_info,&pid); | ||
| if( st !=0){ | ||
| start_time = *st; | ||
| delay = (exit_time - start_time)/1000; | ||
| bpf_map_delete_elem(&time_info, &pid); | ||
| }else{ | ||
| return 0; | ||
| } | ||
| u64 *sc_id = bpf_map_lookup_elem(&id,&pid); | ||
| if( sc_id !=0){ | ||
| syscallid = *sc_id; | ||
| bpf_map_delete_elem(&id, &pid); | ||
| }else{ | ||
| return 0; | ||
| } | ||
| RESERVE_RINGBUF_ENTRY(rb, e); | ||
| e->syscall_data.delay = delay; | ||
| //bpf_get_current_comm(&e->syscall_data.comm, sizeof(e->syscall_data.comm)); | ||
| e->syscall_data.pid = pid; | ||
| e->syscall_data.syscall_id = syscallid; | ||
| bpf_ringbuf_submit(e, 0); | ||
| return 0; | ||
| } | ||
| #define MAX_NODENAME_LEN 64 | ||
| struct data_t { | ||
| char nodename[MAX_NODENAME_LEN]; | ||
| }; | ||
| // 字符串比较函数 | ||
| static bool str_not_equal(const char *s1, const char *s2) { | ||
| #pragma clang loop unroll(full) | ||
| for (int i = 0; i < MAX_NODENAME_LEN; i++) { | ||
| if (s1[i] != s2[i]) { | ||
| return true; | ||
| } | ||
| if (s1[i] == '\0') { | ||
| break; | ||
| } | ||
| } | ||
| return false; | ||
| } | ||
| static bool is_container_task(){ | ||
| struct task_struct *task; | ||
| struct nsproxy *ns; | ||
| struct uts_namespace *uts; | ||
| struct data_t data = {}; | ||
|
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| // 获取当前任务的 task_struct | ||
| task = (struct task_struct *)bpf_get_current_task(); | ||
|
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| // 获取 nsproxy | ||
| bpf_probe_read_kernel(&ns, sizeof(ns), &task->nsproxy); | ||
| if (!ns) { | ||
| return false; | ||
| } | ||
|
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| // 获取 uts_namespace | ||
| bpf_probe_read_kernel(&uts, sizeof(uts), &ns->uts_ns); | ||
| if (!uts) { | ||
| return false; | ||
| } | ||
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| // 读取主机名 | ||
| bpf_probe_read_kernel_str(&data.nodename, sizeof(data.nodename), uts->name.nodename); | ||
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| // 打印主机名 | ||
| //bpf_printk("Hostname: %s\n", data.nodename); | ||
| const char target_nodename[] = "yys-virtual-machine"; | ||
| if (str_not_equal(data.nodename, target_nodename)) { | ||
| bpf_printk("Hostname: %s\n", data.nodename); | ||
| return true; | ||
| } else { | ||
| return false; | ||
| } | ||
|
|
||
| } | ||
| #endif /* __CONTAINER_H */ | ||
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建议target_nodename通过命令行参数传递
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好，我准备后期把这个完善好