projects / linux-2.6-block.git / blame
| Commit | Line | Data |
|---|---|---|
| 9811e353 AS |
1 | /* Copyright (c) 2015 PLUMgrid, http://plumgrid.com |
| 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/ptrace.h> | |
| 8 | #include <linux/version.h> | |
| 9 | #include <uapi/linux/bpf.h> | |
| 10 | #include "bpf_helpers.h" | |
| 11 | ||
| 12 | struct pair { | |
| 13 | u64 val; | |
| 14 | u64 ip; | |
| 15 | }; | |
| 16 | ||
| 17 | struct bpf_map_def SEC("maps") my_map = { | |
| 18 | .type = BPF_MAP_TYPE_HASH, | |
| 19 | .key_size = sizeof(long), | |
| 20 | .value_size = sizeof(struct pair), | |
| 21 | .max_entries = 1000000, | |
| 22 | }; | |
| 23 | ||
| 24 | /* kprobe is NOT a stable ABI. If kernel internals change this bpf+kprobe | |
| 25 | * example will no longer be meaningful | |
| 26 | */ | |
| 27 | SEC("kprobe/kmem_cache_free") | |
| 28 | int bpf_prog1(struct pt_regs *ctx) | |
| 29 | { | |
| d912557b | 30 | long ptr = PT_REGS_PARM2(ctx); |
| 9811e353 AS |
31 | |
| 32 | bpf_map_delete_elem(&my_map, &ptr); | |
| 33 | return 0; | |
| 34 | } | |
| 35 | ||
| 36 | SEC("kretprobe/kmem_cache_alloc_node") | |
| 37 | int bpf_prog2(struct pt_regs *ctx) | |
| 38 | { | |
| d912557b | 39 | long ptr = PT_REGS_RC(ctx); |
| 9811e353 AS |
40 | long ip = 0; |
| 41 | ||
| 42 | /* get ip address of kmem_cache_alloc_node() caller */ | |
| d912557b | 43 | bpf_probe_read(&ip, sizeof(ip), (void *)(PT_REGS_FP(ctx) + sizeof(ip))); |
| 9811e353 AS |
44 | |
| 45 | struct pair v = { | |
| 46 | .val = bpf_ktime_get_ns(), | |
| 47 | .ip = ip, | |
| 48 | }; | |
| 49 | ||
| 50 | bpf_map_update_elem(&my_map, &ptr, &v, BPF_ANY); | |
| 51 | return 0; | |
| 52 | } | |
| 53 | char _license[] SEC("license") = "GPL"; | |
| 54 | u32 _version SEC("version") = LINUX_VERSION_CODE; |