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69 lines
2.1 KiB
69 lines
2.1 KiB
/* 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/bpf_helpers.h> |
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#include <bpf/bpf_tracing.h> |
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struct { |
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__uint(type, BPF_MAP_TYPE_HASH); |
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__type(key, long); |
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__type(value, long); |
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__uint(max_entries, 1024); |
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} my_map SEC(".maps"); |
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struct { |
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__uint(type, BPF_MAP_TYPE_PERCPU_HASH); |
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__uint(key_size, sizeof(long)); |
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__uint(value_size, sizeof(long)); |
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__uint(max_entries, 1024); |
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} my_map2 SEC(".maps"); |
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struct { |
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__uint(type, BPF_MAP_TYPE_STACK_TRACE); |
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__uint(key_size, sizeof(u32)); |
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__uint(value_size, PERF_MAX_STACK_DEPTH * sizeof(u64)); |
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__uint(max_entries, 10000); |
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} stackmap SEC(".maps"); |
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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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