patch-2.1.27 linux/net/ax25/ax25_uid.c

• Lines: 190
• Date: Tue Feb 25 17:12:51 1997
• Orig file: v2.1.26/linux/net/ax25/ax25_uid.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.1.26/linux/net/ax25/ax25_uid.c linux/net/ax25/ax25_uid.c
@@ -0,0 +1,189 @@
+/*
+ *	AX.25 release 036
+ *
+ *	This is ALPHA test software. This code may break your machine, randomly fail to work with new
+ *	releases, misbehave and/or generally screw up. It might even work.
+ *
+ *	This code REQUIRES 2.1.15 or higher/ NET3.038
+ *
+ *	This module:
+ *		This module is free software; you can redistribute it and/or
+ *		modify it under the terms of the GNU General Public License
+ *		as published by the Free Software Foundation; either version
+ *		2 of the License, or (at your option) any later version.
+ *
+ *	History
+ *	AX.25 036	Jonathan(G4KLX)	Split from af_ax25.c.
+ */
+
+#include <linux/config.h>
+#if defined(CONFIG_AX25) || defined(CONFIG_AX25_MODULE)
+#include <linux/errno.h>
+#include <linux/types.h>
+#include <linux/socket.h>
+#include <linux/in.h>
+#include <linux/kernel.h>
+#include <linux/sched.h>
+#include <linux/timer.h>
+#include <linux/string.h>
+#include <linux/sockios.h>
+#include <linux/net.h>
+#include <net/ax25.h>
+#include <linux/inet.h>
+#include <linux/netdevice.h>
+#include <linux/if_arp.h>
+#include <linux/skbuff.h>
+#include <net/sock.h>
+#include <asm/uaccess.h>
+#include <asm/system.h>
+#include <linux/fcntl.h>
+#include <linux/mm.h>
+#include <linux/interrupt.h>
+#include <linux/notifier.h>
+#include <linux/proc_fs.h>
+#include <linux/stat.h>
+#include <linux/firewall.h>
+#include <linux/sysctl.h>
+#include <net/ip.h>
+#include <net/arp.h>
+
+/*
+ *	Callsign/UID mapper. This is in kernel space for security on multi-amateur machines.
+ */
+
+static ax25_uid_assoc *ax25_uid_list = NULL;
+
+int ax25_uid_policy = 0;
+
+ax25_address *ax25_findbyuid(uid_t uid)
+{
+	ax25_uid_assoc *ax25_uid;
+
+	for (ax25_uid = ax25_uid_list; ax25_uid != NULL; ax25_uid = ax25_uid->next) {
+		if (ax25_uid->uid == uid)
+			return &ax25_uid->call;
+	}
+
+	return NULL;
+}
+
+int ax25_uid_ioctl(int cmd, struct sockaddr_ax25 *sax)
+{
+	ax25_uid_assoc *s, *ax25_uid;
+	unsigned long flags;
+
+	switch (cmd) {
+		case SIOCAX25GETUID:
+			for (ax25_uid = ax25_uid_list; ax25_uid != NULL; ax25_uid = ax25_uid->next) {
+				if (ax25cmp(&sax->sax25_call, &ax25_uid->call) == 0)
+					return ax25_uid->uid;
+			}
+			return -ENOENT;
+
+		case SIOCAX25ADDUID:
+			if (!suser())
+				return -EPERM;
+			if (ax25_findbyuid(sax->sax25_uid))
+				return -EEXIST;
+			if (sax->sax25_uid == 0)
+				return -EINVAL;
+			if ((ax25_uid = kmalloc(sizeof(*ax25_uid), GFP_KERNEL)) == NULL)
+				return -ENOMEM;
+			ax25_uid->uid  = sax->sax25_uid;
+			ax25_uid->call = sax->sax25_call;
+			save_flags(flags); cli();
+			ax25_uid->next = ax25_uid_list;
+			ax25_uid_list  = ax25_uid;
+			restore_flags(flags);
+			return 0;
+
+		case SIOCAX25DELUID:
+			if (!suser())
+				return -EPERM;
+			for (ax25_uid = ax25_uid_list; ax25_uid != NULL; ax25_uid = ax25_uid->next) {
+				if (ax25cmp(&sax->sax25_call, &ax25_uid->call) == 0)
+					break;
+			}
+			if (ax25_uid == NULL)
+				return -ENOENT;
+			save_flags(flags); cli();
+			if ((s = ax25_uid_list) == ax25_uid) {
+				ax25_uid_list = s->next;
+				restore_flags(flags);
+				kfree_s(ax25_uid, sizeof(ax25_uid_assoc));
+				return 0;
+			}
+			while (s != NULL && s->next != NULL) {
+				if (s->next == ax25_uid) {
+					s->next = ax25_uid->next;
+					restore_flags(flags);
+					kfree_s(ax25_uid, sizeof(ax25_uid_assoc));
+					return 0;
+				}
+				s = s->next;
+			}
+			restore_flags(flags);
+			return -ENOENT;
+
+		default:
+			return -EINVAL;
+	}
+
+	return -EINVAL;	/*NOTREACHED */
+}
+
+int ax25_uid_get_info(char *buffer, char **start, off_t offset, int length, int dummy)
+{
+	ax25_uid_assoc *pt;
+	int len     = 0;
+	off_t pos   = 0;
+	off_t begin = 0;
+
+	cli();
+
+	len += sprintf(buffer, "Policy: %d\n", ax25_uid_policy);
+
+	for (pt = ax25_uid_list; pt != NULL; pt = pt->next) {
+		len += sprintf(buffer + len, "%6d %s\n", pt->uid, ax2asc(&pt->call));
+
+		pos = begin + len;
+
+		if (pos < offset) {
+			len = 0;
+			begin = pos;
+		}
+
+		if (pos > offset + length)
+			break;
+	}
+
+	sti();
+
+	*start = buffer + (offset - begin);
+	len   -= offset - begin;
+
+	if (len > length) len = length;
+
+	return len;
+}
+
+#ifdef MODULE
+
+/*
+ *	Free all memory associated with UID/Callsign structures.
+ */
+void ax25_uid_free(void)
+{
+	ax25_uid_assoc *s, *ax25_uid = ax25_uid_list;
+
+	while (ax25_uid != NULL) {
+		s        = ax25_uid;
+		ax25_uid = ax25_uid->next;
+
+		kfree_s(s, sizeof(ax25_uid_assoc));
+	}
+}
+
+#endif
+
+#endif