tools/testing/selftests/bpf/progs/test_sockmap_listen.c

Source file repositories/reference/linux-study-clean/tools/testing/selftests/bpf/progs/test_sockmap_listen.c

File Facts

System
Linux kernel
Corpus path
tools/testing/selftests/bpf/progs/test_sockmap_listen.c
Extension
.c
Size
2841 bytes
Lines
141
Domain
Support Tooling And Documentation
Bucket
tools
Inferred role
Support Tooling And Documentation: implementation source
Status
source implementation candidate

Why This File Exists

Repository support layer: documentation, build tooling, samples, user-space helper tools, generated initramfs support, licenses, and validation utilities.

Dependency Surface

Detected Declarations

Annotated Snippet

// SPDX-License-Identifier: GPL-2.0
// Copyright (c) 2020 Cloudflare

#include <errno.h>
#include <stdbool.h>
#include <linux/bpf.h>

#include <bpf/bpf_helpers.h>

struct {
	__uint(type, BPF_MAP_TYPE_SOCKMAP);
	__uint(max_entries, 2);
	__type(key, __u32);
	__type(value, __u64);
} sock_map SEC(".maps");

struct {
	__uint(type, BPF_MAP_TYPE_SOCKMAP);
	__uint(max_entries, 2);
	__type(key, __u32);
	__type(value, __u64);
} nop_map SEC(".maps");

struct {
	__uint(type, BPF_MAP_TYPE_SOCKHASH);
	__uint(max_entries, 2);
	__type(key, __u32);
	__type(value, __u64);
} sock_hash SEC(".maps");

struct {
	__uint(type, BPF_MAP_TYPE_ARRAY);
	__uint(max_entries, 2);
	__type(key, int);
	__type(value, unsigned int);
} verdict_map SEC(".maps");

struct {
	__uint(type, BPF_MAP_TYPE_ARRAY);
	__uint(max_entries, 1);
	__type(key, int);
	__type(value, int);
} parser_map SEC(".maps");

bool test_sockmap = false; /* toggled by user-space */
bool test_ingress = false; /* toggled by user-space */

SEC("sk_skb/stream_parser")
int prog_stream_parser(struct __sk_buff *skb)
{
	int *value;
	__u32 key = 0;

	value = bpf_map_lookup_elem(&parser_map, &key);
	if (value && *value)
		return *value;

	return skb->len;
}

SEC("sk_skb/stream_verdict")
int prog_stream_verdict(struct __sk_buff *skb)
{
	unsigned int *count;
	__u32 zero = 0;
	int verdict;

	if (test_sockmap)
		verdict = bpf_sk_redirect_map(skb, &sock_map, zero, 0);
	else
		verdict = bpf_sk_redirect_hash(skb, &sock_hash, &zero, 0);

	count = bpf_map_lookup_elem(&verdict_map, &verdict);
	if (count)
		(*count)++;

	return verdict;
}

SEC("sk_skb")
int prog_skb_verdict(struct __sk_buff *skb)
{
	unsigned int *count;
	__u32 zero = 0;
	int verdict;

	if (test_sockmap)
		verdict = bpf_sk_redirect_map(skb, &sock_map, zero,
					      test_ingress ? BPF_F_INGRESS : 0);
	else

Annotation

Implementation Notes