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// SPDX-License-Identifier: GPL-2.0
/* Copyright (c) 2020 Google LLC. */
#include <vmlinux.h>
#include <bpf/bpf_helpers.h>
#include <bpf/bpf_tracing.h>
char _license[] SEC("license") = "GPL";
struct {
__uint(type, BPF_MAP_TYPE_SK_STORAGE);
__uint(map_flags, BPF_F_NO_PREALLOC);
__type(key, int);
__type(value, int);
} sk_stg_map SEC(".maps");
SEC("iter/bpf_sk_storage_map")
int delete_bpf_sk_storage_map(struct bpf_iter__bpf_sk_storage_map *ctx)
{
if (ctx->sk)
bpf_sk_storage_delete(&sk_stg_map, ctx->sk);
return 0;
}
SEC("iter/task_file")
int fill_socket_owner(struct bpf_iter__task_file *ctx)
{
struct task_struct *task = ctx->task;
struct file *file = ctx->file;
struct socket *sock;
int *sock_tgid;
if (!task || !file)
return 0;
sock = bpf_sock_from_file(file);
if (!sock)
return 0;
sock_tgid = bpf_sk_storage_get(&sk_stg_map, sock->sk, 0, 0);
if (!sock_tgid)
return 0;
*sock_tgid = task->tgid;
return 0;
}
SEC("iter/tcp")
int negate_socket_local_storage(struct bpf_iter__tcp *ctx)
{
struct sock_common *sk_common = ctx->sk_common;
int *sock_tgid;
if (!sk_common)
return 0;
sock_tgid = bpf_sk_storage_get(&sk_stg_map, sk_common, 0, 0);
if (!sock_tgid)
return 0;
*sock_tgid = -*sock_tgid;
return 0;
}
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