1 files changed, 113 insertions, 0 deletions

diff --git a/security/selinux/netlink.c b/security/selinux/netlink.c
new file mode 100644
index 000000000000..18d08acafa78
--- /dev/null
+++ b/security/selinux/netlink.c
@@ -0,0 +1,113 @@
+/*
+ * 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_broadcast(selnl, skb, 0, SELNL_GRP_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, NULL);
+        if (selnl == NULL)
+                panic("SELinux:  Cannot create netlink socket.");
+        netlink_set_nonroot(NETLINK_SELINUX, NL_NONROOT_RECV);  
+        return 0;
+}
+
+__initcall(selnl_init);