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 <uapi/linux/perf_event.h> 12 #include "bpf_helpers.h" 13 14 struct bpf_map_def SEC("maps") my_map = { 15 .type = BPF_MAP_TYPE_HASH, 16 .key_size = sizeof(long), 17 .value_size = sizeof(long), 18 .max_entries = 1024, 19 }; 20 struct bpf_map_def SEC("maps") my_map2 = { 21 .type = BPF_MAP_TYPE_PERCPU_HASH, 22 .key_size = sizeof(long), 23 .value_size = sizeof(long), 24 .max_entries = 1024, 25 }; 26 27 struct bpf_map_def SEC("maps") stackmap = { 28 .type = BPF_MAP_TYPE_STACK_TRACE, 29 .key_size = sizeof(u32), 30 .value_size = PERF_MAX_STACK_DEPTH * sizeof(u64), 31 .max_entries = 10000, 32 }; 33 34 #define PROG(foo) \ 35 int foo(struct pt_regs *ctx) \ 36 { \ 37 long v = PT_REGS_IP(ctx), *val; \ 38 \ 39 val = bpf_map_lookup_elem(&my_map, &v); \ 40 bpf_map_update_elem(&my_map, &v, &v, BPF_ANY); \ 41 bpf_map_update_elem(&my_map2, &v, &v, BPF_ANY); \ 42 bpf_map_delete_elem(&my_map2, &v); \ 43 bpf_get_stackid(ctx, &stackmap, BPF_F_REUSE_STACKID); \ 44 return 0; \ 45 } 46 47 /* add kprobes to all possible *spin* functions */ 48 SEC("kprobe/spin_unlock")PROG(p1) 49 SEC("kprobe/spin_lock")PROG(p2) 50 SEC("kprobe/mutex_spin_on_owner")PROG(p3) 51 SEC("kprobe/rwsem_spin_on_owner")PROG(p4) 52 SEC("kprobe/spin_unlock_irqrestore")PROG(p5) 53 SEC("kprobe/_raw_spin_unlock_irqrestore")PROG(p6) 54 SEC("kprobe/_raw_spin_unlock_bh")PROG(p7) 55 SEC("kprobe/_raw_spin_unlock")PROG(p8) 56 SEC("kprobe/_raw_spin_lock_irqsave")PROG(p9) 57 SEC("kprobe/_raw_spin_trylock_bh")PROG(p10) 58 SEC("kprobe/_raw_spin_lock_irq")PROG(p11) 59 SEC("kprobe/_raw_spin_trylock")PROG(p12) 60 SEC("kprobe/_raw_spin_lock")PROG(p13) 61 SEC("kprobe/_raw_spin_lock_bh")PROG(p14) 62 /* and to inner bpf helpers */ 63 SEC("kprobe/htab_map_update_elem")PROG(p15) 64 SEC("kprobe/__htab_percpu_map_update_elem")PROG(p16) 65 SEC("kprobe/htab_map_alloc")PROG(p17) 66 67 char _license[] SEC("license") = "GPL"; 68 u32 _version SEC("version") = LINUX_VERSION_CODE; 69