| // SPDX-License-Identifier: GPL-2.0 |
| /* Copyright (c) 2020 Google LLC. */ |
| #include "bpf_iter.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; |
| } |