| 123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869 |
- /* 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;
|
