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// SPDX-License-Identifier: GPL-2.0
/* Copyright (c) 2020 Facebook */
#include <vmlinux.h>
#include <bpf/bpf_tracing.h>
#include <bpf/bpf_core_read.h>
#include <bpf/bpf_helpers.h>
struct sk_stg {
__u32 pid;
__u32 last_notclose_state;
char comm[16];
};
struct {
__uint(type, BPF_MAP_TYPE_SK_STORAGE);
__uint(map_flags, BPF_F_NO_PREALLOC);
__type(key, int);
__type(value, struct sk_stg);
} sk_stg_map SEC(".maps");
/* Testing delete */
struct {
__uint(type, BPF_MAP_TYPE_SK_STORAGE);
__uint(map_flags, BPF_F_NO_PREALLOC);
__type(key, int);
__type(value, int);
} del_sk_stg_map SEC(".maps");
char task_comm[16] = "";
SEC("tp_btf/inet_sock_set_state")
int BPF_PROG(trace_inet_sock_set_state, struct sock *sk, int oldstate,
int newstate)
{
struct sk_stg *stg;
if (newstate == BPF_TCP_CLOSE)
return 0;
stg = bpf_sk_storage_get(&sk_stg_map, sk, 0,
BPF_SK_STORAGE_GET_F_CREATE);
if (!stg)
return 0;
stg->last_notclose_state = newstate;
bpf_sk_storage_delete(&del_sk_stg_map, sk);
return 0;
}
static void set_task_info(struct sock *sk)
{
struct task_struct *task;
struct sk_stg *stg;
stg = bpf_sk_storage_get(&sk_stg_map, sk, 0,
BPF_SK_STORAGE_GET_F_CREATE);
if (!stg)
return;
stg->pid = bpf_get_current_pid_tgid();
task = (struct task_struct *)bpf_get_current_task();
bpf_core_read_str(&stg->comm, sizeof(stg->comm), &task->comm);
bpf_core_read_str(&task_comm, sizeof(task_comm), &task->comm);
}
SEC("fentry/inet_csk_listen_start")
int BPF_PROG(trace_inet_csk_listen_start, struct sock *sk)
{
set_task_info(sk);
return 0;
}
SEC("fentry/tcp_connect")
int BPF_PROG(trace_tcp_connect, struct sock *sk)
{
set_task_info(sk);
return 0;
}
SEC("fexit/inet_csk_accept")
int BPF_PROG(inet_csk_accept, struct sock *sk, int flags, int *err, bool kern,
struct sock *accepted_sk)
{
set_task_info(accepted_sk);
return 0;
}
char _license[] SEC("license") = "GPL";
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