1*0334b4d8SMartin KaFai Lau // SPDX-License-Identifier: GPL-2.0
2*0334b4d8SMartin KaFai Lau
3*0334b4d8SMartin KaFai Lau #include "vmlinux.h"
4*0334b4d8SMartin KaFai Lau #include <bpf/bpf_helpers.h>
5*0334b4d8SMartin KaFai Lau #include <bpf/bpf_tracing.h>
6*0334b4d8SMartin KaFai Lau
7*0334b4d8SMartin KaFai Lau char _license[] SEC("license") = "GPL";
8*0334b4d8SMartin KaFai Lau
9*0334b4d8SMartin KaFai Lau #ifndef EBUSY
10*0334b4d8SMartin KaFai Lau #define EBUSY 16
11*0334b4d8SMartin KaFai Lau #endif
12*0334b4d8SMartin KaFai Lau
13*0334b4d8SMartin KaFai Lau extern bool CONFIG_PREEMPT __kconfig __weak;
14*0334b4d8SMartin KaFai Lau int nr_get_errs = 0;
15*0334b4d8SMartin KaFai Lau int nr_del_errs = 0;
16*0334b4d8SMartin KaFai Lau
17*0334b4d8SMartin KaFai Lau struct {
18*0334b4d8SMartin KaFai Lau __uint(type, BPF_MAP_TYPE_TASK_STORAGE);
19*0334b4d8SMartin KaFai Lau __uint(map_flags, BPF_F_NO_PREALLOC);
20*0334b4d8SMartin KaFai Lau __type(key, int);
21*0334b4d8SMartin KaFai Lau __type(value, int);
22*0334b4d8SMartin KaFai Lau } task_storage SEC(".maps");
23*0334b4d8SMartin KaFai Lau
24*0334b4d8SMartin KaFai Lau SEC("lsm.s/socket_post_create")
BPF_PROG(socket_post_create,struct socket * sock,int family,int type,int protocol,int kern)25*0334b4d8SMartin KaFai Lau int BPF_PROG(socket_post_create, struct socket *sock, int family, int type,
26*0334b4d8SMartin KaFai Lau int protocol, int kern)
27*0334b4d8SMartin KaFai Lau {
28*0334b4d8SMartin KaFai Lau struct task_struct *task;
29*0334b4d8SMartin KaFai Lau int ret, zero = 0;
30*0334b4d8SMartin KaFai Lau int *value;
31*0334b4d8SMartin KaFai Lau
32*0334b4d8SMartin KaFai Lau if (!CONFIG_PREEMPT)
33*0334b4d8SMartin KaFai Lau return 0;
34*0334b4d8SMartin KaFai Lau
35*0334b4d8SMartin KaFai Lau task = bpf_get_current_task_btf();
36*0334b4d8SMartin KaFai Lau value = bpf_task_storage_get(&task_storage, task, &zero,
37*0334b4d8SMartin KaFai Lau BPF_LOCAL_STORAGE_GET_F_CREATE);
38*0334b4d8SMartin KaFai Lau if (!value)
39*0334b4d8SMartin KaFai Lau __sync_fetch_and_add(&nr_get_errs, 1);
40*0334b4d8SMartin KaFai Lau
41*0334b4d8SMartin KaFai Lau ret = bpf_task_storage_delete(&task_storage,
42*0334b4d8SMartin KaFai Lau bpf_get_current_task_btf());
43*0334b4d8SMartin KaFai Lau if (ret == -EBUSY)
44*0334b4d8SMartin KaFai Lau __sync_fetch_and_add(&nr_del_errs, 1);
45*0334b4d8SMartin KaFai Lau
46*0334b4d8SMartin KaFai Lau return 0;
47*0334b4d8SMartin KaFai Lau }
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