tools/testing/selftests/bpf/progs/xfrm_info.c
Source file repositories/reference/linux-study-clean/tools/testing/selftests/bpf/progs/xfrm_info.c
File Facts
- System
- Linux kernel
- Corpus path
tools/testing/selftests/bpf/progs/xfrm_info.c- Extension
.c- Size
- 936 bytes
- Lines
- 42
- 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
vmlinux.hbpf_tracing_net.hbpf/bpf_helpers.h
Detected Declarations
struct bpf_xfrm_info___localfunction set_xfrm_infofunction get_xfrm_info
Annotated Snippet
struct bpf_xfrm_info___local {
u32 if_id;
int link;
} __attribute__((preserve_access_index));
__u32 req_if_id;
__u32 resp_if_id;
int bpf_skb_set_xfrm_info(struct __sk_buff *skb_ctx,
const struct bpf_xfrm_info___local *from) __ksym;
int bpf_skb_get_xfrm_info(struct __sk_buff *skb_ctx,
struct bpf_xfrm_info___local *to) __ksym;
SEC("tc")
int set_xfrm_info(struct __sk_buff *skb)
{
struct bpf_xfrm_info___local info = { .if_id = req_if_id };
return bpf_skb_set_xfrm_info(skb, &info) ? TC_ACT_SHOT : TC_ACT_UNSPEC;
}
SEC("tc")
int get_xfrm_info(struct __sk_buff *skb)
{
struct bpf_xfrm_info___local info = {};
if (bpf_skb_get_xfrm_info(skb, &info) < 0)
return TC_ACT_SHOT;
resp_if_id = info.if_id;
return TC_ACT_UNSPEC;
}
char _license[] SEC("license") = "GPL";
Annotation
- Immediate include surface: `vmlinux.h`, `bpf_tracing_net.h`, `bpf/bpf_helpers.h`.
- Detected declarations: `struct bpf_xfrm_info___local`, `function set_xfrm_info`, `function get_xfrm_info`.
- 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.