48 lines
1.0 KiB
C
48 lines
1.0 KiB
C
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// SPDX-License-Identifier: GPL-2.0
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#include "vmlinux.h"
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#include <bpf/bpf_helpers.h>
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#include <bpf/bpf_tracing.h>
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char _license[] SEC("license") = "GPL";
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#ifndef EBUSY
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#define EBUSY 16
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#endif
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extern bool CONFIG_PREEMPT __kconfig __weak;
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int nr_get_errs = 0;
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int nr_del_errs = 0;
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struct {
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__uint(type, BPF_MAP_TYPE_TASK_STORAGE);
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__uint(map_flags, BPF_F_NO_PREALLOC);
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__type(key, int);
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__type(value, int);
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} task_storage SEC(".maps");
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SEC("lsm.s/socket_post_create")
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int BPF_PROG(socket_post_create, struct socket *sock, int family, int type,
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int protocol, int kern)
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{
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struct task_struct *task;
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int ret, zero = 0;
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int *value;
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if (!CONFIG_PREEMPT)
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return 0;
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task = bpf_get_current_task_btf();
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value = bpf_task_storage_get(&task_storage, task, &zero,
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BPF_LOCAL_STORAGE_GET_F_CREATE);
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if (!value)
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__sync_fetch_and_add(&nr_get_errs, 1);
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ret = bpf_task_storage_delete(&task_storage,
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bpf_get_current_task_btf());
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if (ret == -EBUSY)
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__sync_fetch_and_add(&nr_del_errs, 1);
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return 0;
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}
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