| Alexei Starovoitov | 9d8b612 | 2016-03-08 15:07:52 -0800 | [diff] [blame^] | 1 | /* Copyright (c) 2016, Facebook |
| 2 | * |
| 3 | * This program is free software; you can redistribute it and/or |
| 4 | * modify it under the terms of version 2 of the GNU General Public |
| 5 | * License as published by the Free Software Foundation. |
| 6 | */ |
| 7 | #include <linux/skbuff.h> |
| 8 | #include <linux/netdevice.h> |
| 9 | #include <linux/version.h> |
| 10 | #include <uapi/linux/bpf.h> |
| 11 | #include "bpf_helpers.h" |
| 12 | |
| 13 | struct bpf_map_def SEC("maps") my_map = { |
| 14 | .type = BPF_MAP_TYPE_HASH, |
| 15 | .key_size = sizeof(long), |
| 16 | .value_size = sizeof(long), |
| 17 | .max_entries = 1024, |
| 18 | }; |
| 19 | struct bpf_map_def SEC("maps") my_map2 = { |
| 20 | .type = BPF_MAP_TYPE_PERCPU_HASH, |
| 21 | .key_size = sizeof(long), |
| 22 | .value_size = sizeof(long), |
| 23 | .max_entries = 1024, |
| 24 | }; |
| 25 | |
| 26 | #define PROG(foo) \ |
| 27 | int foo(struct pt_regs *ctx) \ |
| 28 | { \ |
| 29 | long v = ctx->ip, *val; \ |
| 30 | \ |
| 31 | val = bpf_map_lookup_elem(&my_map, &v); \ |
| 32 | bpf_map_update_elem(&my_map, &v, &v, BPF_ANY); \ |
| 33 | bpf_map_update_elem(&my_map2, &v, &v, BPF_ANY); \ |
| 34 | bpf_map_delete_elem(&my_map2, &v); \ |
| 35 | return 0; \ |
| 36 | } |
| 37 | |
| 38 | /* add kprobes to all possible *spin* functions */ |
| 39 | SEC("kprobe/spin_unlock")PROG(p1) |
| 40 | SEC("kprobe/spin_lock")PROG(p2) |
| 41 | SEC("kprobe/mutex_spin_on_owner")PROG(p3) |
| 42 | SEC("kprobe/rwsem_spin_on_owner")PROG(p4) |
| 43 | SEC("kprobe/spin_unlock_irqrestore")PROG(p5) |
| 44 | SEC("kprobe/_raw_spin_unlock_irqrestore")PROG(p6) |
| 45 | SEC("kprobe/_raw_spin_unlock_bh")PROG(p7) |
| 46 | SEC("kprobe/_raw_spin_unlock")PROG(p8) |
| 47 | SEC("kprobe/_raw_spin_lock_irqsave")PROG(p9) |
| 48 | SEC("kprobe/_raw_spin_trylock_bh")PROG(p10) |
| 49 | SEC("kprobe/_raw_spin_lock_irq")PROG(p11) |
| 50 | SEC("kprobe/_raw_spin_trylock")PROG(p12) |
| 51 | SEC("kprobe/_raw_spin_lock")PROG(p13) |
| 52 | SEC("kprobe/_raw_spin_lock_bh")PROG(p14) |
| 53 | /* and to inner bpf helpers */ |
| 54 | SEC("kprobe/htab_map_update_elem")PROG(p15) |
| 55 | SEC("kprobe/__htab_percpu_map_update_elem")PROG(p16) |
| 56 | SEC("kprobe/htab_map_alloc")PROG(p17) |
| 57 | |
| 58 | char _license[] SEC("license") = "GPL"; |
| 59 | u32 _version SEC("version") = LINUX_VERSION_CODE; |