tools/testing/selftests/bpf/progs/freplace_cls_redirect.c
Source file repositories/reference/linux-study-clean/tools/testing/selftests/bpf/progs/freplace_cls_redirect.c
File Facts
- System
- Linux kernel
- Corpus path
tools/testing/selftests/bpf/progs/freplace_cls_redirect.c- Extension
.c- Size
- 722 bytes
- Lines
- 35
- 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.
- Repository support layer: documentation, build tooling, samples, user-space helper tools, generated initramfs support, licenses, and validation utilities.
- Defines or uses C structs; map object ownership, embedded links, reference counts, and lock ownership.
Dependency Surface
linux/stddef.hlinux/bpf.hlinux/pkt_cls.hbpf/bpf_endian.hbpf/bpf_helpers.h
Detected Declarations
function freplace_cls_redirect_test
Annotated Snippet
// SPDX-License-Identifier: GPL-2.0
// Copyright (c) 2020 Facebook
#include <linux/stddef.h>
#include <linux/bpf.h>
#include <linux/pkt_cls.h>
#include <bpf/bpf_endian.h>
#include <bpf/bpf_helpers.h>
struct {
__uint(type, BPF_MAP_TYPE_SOCKMAP);
__type(key, int);
__type(value, int);
__uint(max_entries, 2);
} sock_map SEC(".maps");
SEC("freplace/cls_redirect")
int freplace_cls_redirect_test(struct __sk_buff *skb)
{
int ret = 0;
const int zero = 0;
struct bpf_sock *sk;
sk = bpf_map_lookup_elem(&sock_map, &zero);
if (!sk)
return TC_ACT_SHOT;
ret = bpf_map_update_elem(&sock_map, &zero, sk, 0);
bpf_sk_release(sk);
return ret == 0 ? TC_ACT_OK : TC_ACT_SHOT;
}
char _license[] SEC("license") = "GPL";
Annotation
- Immediate include surface: `linux/stddef.h`, `linux/bpf.h`, `linux/pkt_cls.h`, `bpf/bpf_endian.h`, `bpf/bpf_helpers.h`.
- Detected declarations: `function freplace_cls_redirect_test`.
- Atlas domain: Support Tooling And Documentation / tools.
- Implementation status: source implementation candidate.
Implementation Notes
- This generated page is the file-by-file coverage layer; curated subsystem chapters should link here when they synthesize a multi-file control flow.
- Core OS pages should be promoted from atlas-only to deep-reviewed when they explain data structures, invariants, locking, lifecycle, and C implementation snippets.
- Driver-family pages are intentionally pattern-oriented unless they are part of the selected PCIe/NVMe representative device path.