You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
68 lines
2.1 KiB
68 lines
2.1 KiB
/* Copyright (c) 2016, Facebook
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of version 2 of the GNU General Public
|
|
* License as published by the Free Software Foundation.
|
|
*/
|
|
#include <linux/skbuff.h>
|
|
#include <linux/netdevice.h>
|
|
#include <linux/version.h>
|
|
#include <uapi/linux/bpf.h>
|
|
#include <uapi/linux/perf_event.h>
|
|
#include "bpf_helpers.h"
|
|
|
|
struct bpf_map_def SEC("maps") my_map = {
|
|
.type = BPF_MAP_TYPE_HASH,
|
|
.key_size = sizeof(long),
|
|
.value_size = sizeof(long),
|
|
.max_entries = 1024,
|
|
};
|
|
struct bpf_map_def SEC("maps") my_map2 = {
|
|
.type = BPF_MAP_TYPE_PERCPU_HASH,
|
|
.key_size = sizeof(long),
|
|
.value_size = sizeof(long),
|
|
.max_entries = 1024,
|
|
};
|
|
|
|
struct bpf_map_def SEC("maps") stackmap = {
|
|
.type = BPF_MAP_TYPE_STACK_TRACE,
|
|
.key_size = sizeof(u32),
|
|
.value_size = PERF_MAX_STACK_DEPTH * sizeof(u64),
|
|
.max_entries = 10000,
|
|
};
|
|
|
|
#define PROG(foo) \
|
|
int foo(struct pt_regs *ctx) \
|
|
{ \
|
|
long v = PT_REGS_IP(ctx), *val; \
|
|
\
|
|
val = bpf_map_lookup_elem(&my_map, &v); \
|
|
bpf_map_update_elem(&my_map, &v, &v, BPF_ANY); \
|
|
bpf_map_update_elem(&my_map2, &v, &v, BPF_ANY); \
|
|
bpf_map_delete_elem(&my_map2, &v); \
|
|
bpf_get_stackid(ctx, &stackmap, BPF_F_REUSE_STACKID); \
|
|
return 0; \
|
|
}
|
|
|
|
/* add kprobes to all possible *spin* functions */
|
|
SEC("kprobe/spin_unlock")PROG(p1)
|
|
SEC("kprobe/spin_lock")PROG(p2)
|
|
SEC("kprobe/mutex_spin_on_owner")PROG(p3)
|
|
SEC("kprobe/rwsem_spin_on_owner")PROG(p4)
|
|
SEC("kprobe/spin_unlock_irqrestore")PROG(p5)
|
|
SEC("kprobe/_raw_spin_unlock_irqrestore")PROG(p6)
|
|
SEC("kprobe/_raw_spin_unlock_bh")PROG(p7)
|
|
SEC("kprobe/_raw_spin_unlock")PROG(p8)
|
|
SEC("kprobe/_raw_spin_lock_irqsave")PROG(p9)
|
|
SEC("kprobe/_raw_spin_trylock_bh")PROG(p10)
|
|
SEC("kprobe/_raw_spin_lock_irq")PROG(p11)
|
|
SEC("kprobe/_raw_spin_trylock")PROG(p12)
|
|
SEC("kprobe/_raw_spin_lock")PROG(p13)
|
|
SEC("kprobe/_raw_spin_lock_bh")PROG(p14)
|
|
/* and to inner bpf helpers */
|
|
SEC("kprobe/htab_map_update_elem")PROG(p15)
|
|
SEC("kprobe/__htab_percpu_map_update_elem")PROG(p16)
|
|
SEC("kprobe/htab_map_alloc")PROG(p17)
|
|
|
|
char _license[] SEC("license") = "GPL";
|
|
u32 _version SEC("version") = LINUX_VERSION_CODE;
|
|
|