blob: 76e75099ff6ada99b1f05e5344a4a6b84dbcf904 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
|
// SPDX-License-Identifier: GPL-2.0
/*****************************************************************************
* Include files
*****************************************************************************/
#include <stdbool.h>
#include <linux/bpf.h>
#include <bpf/bpf_helpers.h>
#include <bpf/bpf_trace_helpers.h>
#include "xdpdump.h"
/*****************************************************************************
* Macros
*****************************************************************************/
#define min(x, y) ((x) < (y) ? x : y)
/*****************************************************************************
* Local definitions and global variables
*****************************************************************************/
struct {
__uint(type, BPF_MAP_TYPE_PERF_EVENT_ARRAY);
__uint(max_entries, MAX_CPUS);
__type(key, int);
__type(value, __u32);
} xdpdump_perf_map SEC(".maps");
/*****************************************************************************
* .data section value storing the capture configuration
*****************************************************************************/
struct trace_configuration trace_cfg SEC(".data");
/*****************************************************************************
* XDP trace program
*****************************************************************************/
SEC("xdp")
int xdpdump(struct xdp_md *xdp)
{
void *data_end = (void *)(long)xdp->data_end;
void *data = (void *)(long)xdp->data;
struct pkt_trace_metadata metadata;
if (data >= data_end ||
trace_cfg.capture_if_ifindex != xdp->ingress_ifindex)
return XDP_PASS;
metadata.prog_index = trace_cfg.capture_prog_index;
metadata.ifindex = xdp->ingress_ifindex;
metadata.rx_queue = xdp->rx_queue_index;
metadata.pkt_len = (__u16)(data_end - data);
metadata.cap_len = min(metadata.pkt_len, trace_cfg.capture_snaplen);
metadata.action = 0;
metadata.flags = 0;
bpf_perf_event_output(xdp, &xdpdump_perf_map,
((__u64) metadata.cap_len << 32) |
BPF_F_CURRENT_CPU,
&metadata, sizeof(metadata));
return XDP_PASS;
}
/*****************************************************************************
* License
*****************************************************************************/
char _license[] SEC("license") = "GPL";
|
