Contributors: 8
| Author |
Tokens |
Token Proportion |
Commits |
Commit Proportion |
| Alexei Starovoitov |
379 |
82.21% |
3 |
23.08% |
| Daniel T. Lee |
73 |
15.84% |
4 |
30.77% |
| Rong Tao |
2 |
0.43% |
1 |
7.69% |
| Andrii Nakryiko |
2 |
0.43% |
1 |
7.69% |
| Toke Höiland-Jörgensen |
2 |
0.43% |
1 |
7.69% |
| Naveen N. Rao |
1 |
0.22% |
1 |
7.69% |
| Daniel Borkmann |
1 |
0.22% |
1 |
7.69% |
| Michael Holzheu |
1 |
0.22% |
1 |
7.69% |
| Total |
461 |
|
13 |
|
/* Copyright (c) 2013-2015 PLUMgrid, http://plumgrid.com
*
* 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 "vmlinux.h"
#include <linux/version.h>
#include <bpf/bpf_helpers.h>
#include <bpf/bpf_tracing.h>
#include <bpf/bpf_core_read.h>
struct {
__uint(type, BPF_MAP_TYPE_HASH);
__type(key, long);
__type(value, long);
__uint(max_entries, 1024);
} my_map SEC(".maps");
/* kprobe is NOT a stable ABI. If kernel internals change this bpf+kprobe
* example will no longer be meaningful
*/
SEC("kprobe/kfree_skb_reason")
int bpf_prog2(struct pt_regs *ctx)
{
long loc = 0;
long init_val = 1;
long *value;
/* read ip of kfree_skb_reason caller.
* non-portable version of __builtin_return_address(0)
*/
BPF_KPROBE_READ_RET_IP(loc, ctx);
value = bpf_map_lookup_elem(&my_map, &loc);
if (value)
*value += 1;
else
bpf_map_update_elem(&my_map, &loc, &init_val, BPF_ANY);
return 0;
}
static unsigned int log2(unsigned int v)
{
unsigned int r;
unsigned int shift;
r = (v > 0xFFFF) << 4; v >>= r;
shift = (v > 0xFF) << 3; v >>= shift; r |= shift;
shift = (v > 0xF) << 2; v >>= shift; r |= shift;
shift = (v > 0x3) << 1; v >>= shift; r |= shift;
r |= (v >> 1);
return r;
}
static unsigned int log2l(unsigned long v)
{
unsigned int hi = v >> 32;
if (hi)
return log2(hi) + 32;
else
return log2(v);
}
struct hist_key {
char comm[16];
u64 pid_tgid;
u64 uid_gid;
u64 index;
};
struct {
__uint(type, BPF_MAP_TYPE_PERCPU_HASH);
__uint(key_size, sizeof(struct hist_key));
__uint(value_size, sizeof(long));
__uint(max_entries, 1024);
} my_hist_map SEC(".maps");
SEC("ksyscall/write")
int BPF_KSYSCALL(bpf_prog3, unsigned int fd, const char *buf, size_t count)
{
long init_val = 1;
long *value;
struct hist_key key;
key.index = log2l(count);
key.pid_tgid = bpf_get_current_pid_tgid();
key.uid_gid = bpf_get_current_uid_gid();
bpf_get_current_comm(&key.comm, sizeof(key.comm));
value = bpf_map_lookup_elem(&my_hist_map, &key);
if (value)
__sync_fetch_and_add(value, 1);
else
bpf_map_update_elem(&my_hist_map, &key, &init_val, BPF_ANY);
return 0;
}
char _license[] SEC("license") = "GPL";
u32 _version SEC("version") = LINUX_VERSION_CODE;