/* * Netlink event notifications for SELinux. * * Author: James Morris <jmorris@redhat.com> * * Copyright (C) 2004 Red Hat, Inc., James Morris <jmorris@redhat.com> * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2, * as published by the Free Software Foundation. */ #include <linux/init.h> #include <linux/types.h> #include <linux/stddef.h> #include <linux/kernel.h> #include <linux/list.h> #include <linux/skbuff.h> #include <linux/netlink.h> #include <linux/selinux_netlink.h> static struct sock *selnl; static int selnl_msglen(int msgtype) { int ret = 0; switch (msgtype) { case SELNL_MSG_SETENFORCE: ret = sizeof(struct selnl_msg_setenforce); break; case SELNL_MSG_POLICYLOAD: ret = sizeof(struct selnl_msg_policyload); break; default: BUG(); } return ret; } static void selnl_add_payload(struct nlmsghdr *nlh, int len, int msgtype, void *data) { switch (msgtype) { case SELNL_MSG_SETENFORCE: { struct selnl_msg_setenforce *msg = NLMSG_DATA(nlh); memset(msg, 0, len); msg->val = *((int *)data); break; } case SELNL_MSG_POLICYLOAD: { struct selnl_msg_policyload *msg = NLMSG_DATA(nlh); memset(msg, 0, len); msg->seqno = *((u32 *)data); break; } default: BUG(); } } static void selnl_notify(int msgtype, void *data) { int len; unsigned char *tmp; struct sk_buff *skb; struct nlmsghdr *nlh; len = selnl_msglen(msgtype); skb = alloc_skb(NLMSG_SPACE(len), GFP_USER); if (!skb) goto oom; tmp = skb->tail; nlh = NLMSG_PUT(skb, 0, 0, msgtype, len); selnl_add_payload(nlh, len, msgtype, data); nlh->nlmsg_len = skb->tail - tmp; NETLINK_CB(skb).dst_group = SELNLGRP_AVC; netlink_broadcast(selnl, skb, 0, SELNLGRP_AVC, GFP_USER); out: return; nlmsg_failure: kfree_skb(skb); oom: printk(KERN_ERR "SELinux: OOM in %s\n", __FUNCTION__); goto out; } void selnl_notify_setenforce(int val) { selnl_notify(SELNL_MSG_SETENFORCE, &val); } void selnl_notify_policyload(u32 seqno) { selnl_notify(SELNL_MSG_POLICYLOAD, &seqno); } static int __init selnl_init(void) { selnl = netlink_kernel_create(NETLINK_SELINUX, SELNLGRP_MAX, NULL, THIS_MODULE); if (selnl == NULL) panic("SELinux: Cannot create netlink socket."); netlink_set_nonroot(NETLINK_SELINUX, NL_NONROOT_RECV); return 0; } __initcall(selnl_init);