68 lines
2.1 KiB
C
68 lines
2.1 KiB
C
/* Copyright (c) 2016, Facebook
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of version 2 of the GNU General Public
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* License as published by the Free Software Foundation.
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*/
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#include <linux/skbuff.h>
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#include <linux/netdevice.h>
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#include <linux/version.h>
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#include <uapi/linux/bpf.h>
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#include <uapi/linux/perf_event.h>
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#include "bpf_helpers.h"
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struct bpf_map_def SEC("maps") my_map = {
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.type = BPF_MAP_TYPE_HASH,
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.key_size = sizeof(long),
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.value_size = sizeof(long),
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.max_entries = 1024,
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};
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struct bpf_map_def SEC("maps") my_map2 = {
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.type = BPF_MAP_TYPE_PERCPU_HASH,
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.key_size = sizeof(long),
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.value_size = sizeof(long),
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.max_entries = 1024,
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};
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struct bpf_map_def SEC("maps") stackmap = {
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.type = BPF_MAP_TYPE_STACK_TRACE,
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.key_size = sizeof(u32),
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.value_size = PERF_MAX_STACK_DEPTH * sizeof(u64),
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.max_entries = 10000,
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};
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#define PROG(foo) \
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int foo(struct pt_regs *ctx) \
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{ \
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long v = PT_REGS_IP(ctx), *val; \
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\
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val = bpf_map_lookup_elem(&my_map, &v); \
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bpf_map_update_elem(&my_map, &v, &v, BPF_ANY); \
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bpf_map_update_elem(&my_map2, &v, &v, BPF_ANY); \
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bpf_map_delete_elem(&my_map2, &v); \
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bpf_get_stackid(ctx, &stackmap, BPF_F_REUSE_STACKID); \
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return 0; \
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}
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/* add kprobes to all possible *spin* functions */
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SEC("kprobe/spin_unlock")PROG(p1)
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SEC("kprobe/spin_lock")PROG(p2)
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SEC("kprobe/mutex_spin_on_owner")PROG(p3)
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SEC("kprobe/rwsem_spin_on_owner")PROG(p4)
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SEC("kprobe/spin_unlock_irqrestore")PROG(p5)
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SEC("kprobe/_raw_spin_unlock_irqrestore")PROG(p6)
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SEC("kprobe/_raw_spin_unlock_bh")PROG(p7)
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SEC("kprobe/_raw_spin_unlock")PROG(p8)
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SEC("kprobe/_raw_spin_lock_irqsave")PROG(p9)
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SEC("kprobe/_raw_spin_trylock_bh")PROG(p10)
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SEC("kprobe/_raw_spin_lock_irq")PROG(p11)
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SEC("kprobe/_raw_spin_trylock")PROG(p12)
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SEC("kprobe/_raw_spin_lock")PROG(p13)
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SEC("kprobe/_raw_spin_lock_bh")PROG(p14)
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/* and to inner bpf helpers */
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SEC("kprobe/htab_map_update_elem")PROG(p15)
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SEC("kprobe/__htab_percpu_map_update_elem")PROG(p16)
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SEC("kprobe/htab_map_alloc")PROG(p17)
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char _license[] SEC("license") = "GPL";
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u32 _version SEC("version") = LINUX_VERSION_CODE;
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