// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Netlink event notifications for SELinux.
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*
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* Author: James Morris <jmorris@redhat.com>
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*
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* Copyright (C) 2004 Red Hat, Inc., James Morris <jmorris@redhat.com>
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*/
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#include <linux/init.h>
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#include <linux/types.h>
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#include <linux/slab.h>
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#include <linux/stddef.h>
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#include <linux/kernel.h>
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#include <linux/export.h>
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#include <linux/skbuff.h>
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#include <linux/selinux_netlink.h>
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#include <net/net_namespace.h>
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#include <net/netlink.h>
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#include "security.h"
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static struct sock *selnl;
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static int selnl_msglen(int msgtype)
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{
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int ret = 0;
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switch (msgtype) {
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case SELNL_MSG_SETENFORCE:
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ret = sizeof(struct selnl_msg_setenforce);
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break;
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case SELNL_MSG_POLICYLOAD:
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ret = sizeof(struct selnl_msg_policyload);
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break;
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default:
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BUG();
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}
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return ret;
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}
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static void selnl_add_payload(struct nlmsghdr *nlh, int len, int msgtype, void *data)
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{
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switch (msgtype) {
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case SELNL_MSG_SETENFORCE: {
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struct selnl_msg_setenforce *msg = nlmsg_data(nlh);
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memset(msg, 0, len);
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msg->val = *((int *)data);
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break;
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}
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case SELNL_MSG_POLICYLOAD: {
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struct selnl_msg_policyload *msg = nlmsg_data(nlh);
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memset(msg, 0, len);
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msg->seqno = *((u32 *)data);
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break;
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}
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default:
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BUG();
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}
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}
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static void selnl_notify(int msgtype, void *data)
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{
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int len;
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sk_buff_data_t tmp;
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struct sk_buff *skb;
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struct nlmsghdr *nlh;
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len = selnl_msglen(msgtype);
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skb = nlmsg_new(len, GFP_USER);
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if (!skb)
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goto oom;
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tmp = skb->tail;
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nlh = nlmsg_put(skb, 0, 0, msgtype, len, 0);
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if (!nlh)
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goto out_kfree_skb;
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selnl_add_payload(nlh, len, msgtype, data);
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nlh->nlmsg_len = skb->tail - tmp;
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NETLINK_CB(skb).dst_group = SELNLGRP_AVC;
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netlink_broadcast(selnl, skb, 0, SELNLGRP_AVC, GFP_USER);
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out:
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return;
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out_kfree_skb:
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kfree_skb(skb);
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oom:
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pr_err("SELinux: OOM in %s\n", __func__);
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goto out;
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}
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void selnl_notify_setenforce(int val)
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{
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selnl_notify(SELNL_MSG_SETENFORCE, &val);
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}
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void selnl_notify_policyload(u32 seqno)
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{
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selnl_notify(SELNL_MSG_POLICYLOAD, &seqno);
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}
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static int __init selnl_init(void)
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{
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struct netlink_kernel_cfg cfg = {
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.groups = SELNLGRP_MAX,
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.flags = NL_CFG_F_NONROOT_RECV,
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};
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selnl = netlink_kernel_create(&init_net, NETLINK_SELINUX, &cfg);
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if (selnl == NULL)
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panic("SELinux: Cannot create netlink socket.");
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return 0;
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}
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__initcall(selnl_init);
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