Contributors: 3
| Author |
Tokens |
Token Proportion |
Commits |
Commit Proportion |
| Andrey Ignatov |
126 |
82.35% |
1 |
25.00% |
| Andrii Nakryiko |
26 |
16.99% |
2 |
50.00% |
| Toke Höiland-Jörgensen |
1 |
0.65% |
1 |
25.00% |
| Total |
153 |
|
4 |
|
// SPDX-License-Identifier: GPL-2.0
// Copyright (c) 2018 Facebook
#include <linux/bpf.h>
#include <linux/pkt_cls.h>
#include <string.h>
#include <bpf/bpf_helpers.h>
#define NUM_CGROUP_LEVELS 4
struct {
__uint(type, BPF_MAP_TYPE_ARRAY);
__type(key, __u32);
__type(value, __u64);
__uint(max_entries, NUM_CGROUP_LEVELS);
} cgroup_ids SEC(".maps");
static __always_inline void log_nth_level(struct __sk_buff *skb, __u32 level)
{
__u64 id;
/* [1] &level passed to external function that may change it, it's
* incompatible with loop unroll.
*/
id = bpf_skb_ancestor_cgroup_id(skb, level);
bpf_map_update_elem(&cgroup_ids, &level, &id, 0);
}
SEC("cgroup_id_logger")
int log_cgroup_id(struct __sk_buff *skb)
{
/* Loop unroll can't be used here due to [1]. Unrolling manually.
* Number of calls should be in sync with NUM_CGROUP_LEVELS.
*/
log_nth_level(skb, 0);
log_nth_level(skb, 1);
log_nth_level(skb, 2);
log_nth_level(skb, 3);
return TC_ACT_OK;
}
char _license[] SEC("license") = "GPL";