1 files changed, 228 insertions, 0 deletions

diff --git a/net/ax25/ax25_uid.c b/net/ax25/ax25_uid.c
new file mode 100644
index 000000000000..cea6b7d19729
--- /dev/null
+++ b/net/ax25/ax25_uid.c
@@ -0,0 +1,228 @@
+/*
+ * This program 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.
+ *
+ * Copyright (C) Jonathan Naylor G4KLX (g4klx@g4klx.demon.co.uk)
+ */
+#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 <linux/spinlock.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/seq_file.h>
+#include <linux/stat.h>
+#include <linux/netfilter.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;
+static DEFINE_RWLOCK(ax25_uid_lock);
+
+int ax25_uid_policy = 0;
+
+ax25_address *ax25_findbyuid(uid_t uid)
+{
+        ax25_uid_assoc *ax25_uid;
+        ax25_address *res = NULL;
+
+        read_lock(&ax25_uid_lock);
+        for (ax25_uid = ax25_uid_list; ax25_uid != NULL; ax25_uid = ax25_uid->next) {
+                if (ax25_uid->uid == uid) {
+                        res = &ax25_uid->call;
+                        break;
+                }
+        }
+        read_unlock(&ax25_uid_lock);
+
+        return NULL;
+}
+
+int ax25_uid_ioctl(int cmd, struct sockaddr_ax25 *sax)
+{
+        ax25_uid_assoc *s, *ax25_uid;
+        unsigned long res;
+
+        switch (cmd) {
+        case SIOCAX25GETUID:
+                res = -ENOENT;
+                read_lock(&ax25_uid_lock);
+                for (ax25_uid = ax25_uid_list; ax25_uid != NULL; ax25_uid = ax25_uid->next) {
+                        if (ax25cmp(&sax->sax25_call, &ax25_uid->call) == 0) {
+                                res = ax25_uid->uid;
+                                break;
+                        }
+                }
+                read_unlock(&ax25_uid_lock);
+
+                return res;
+
+        case SIOCAX25ADDUID:
+                if (!capable(CAP_NET_ADMIN))
+                        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;
+
+                write_lock(&ax25_uid_lock);
+                ax25_uid->next = ax25_uid_list;
+                ax25_uid_list  = ax25_uid;
+                write_unlock(&ax25_uid_lock);
+
+                return 0;
+
+        case SIOCAX25DELUID:
+                if (!capable(CAP_NET_ADMIN))
+                        return -EPERM;
+
+                write_lock(&ax25_uid_lock);
+                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) {
+                        write_unlock(&ax25_uid_lock);
+                        return -ENOENT;
+                }
+                if ((s = ax25_uid_list) == ax25_uid) {
+                        ax25_uid_list = s->next;
+                        write_unlock(&ax25_uid_lock);
+                        kfree(ax25_uid);
+                        return 0;
+                }
+                while (s != NULL && s->next != NULL) {
+                        if (s->next == ax25_uid) {
+                                s->next = ax25_uid->next;
+                                write_unlock(&ax25_uid_lock);
+                                kfree(ax25_uid);
+                                return 0;
+                        }
+                        s = s->next;
+                }
+                write_unlock(&ax25_uid_lock);
+
+                return -ENOENT;
+
+        default:
+                return -EINVAL;
+        }
+
+        return -EINVAL; /*NOTREACHED */
+}
+
+#ifdef CONFIG_PROC_FS
+
+static void *ax25_uid_seq_start(struct seq_file *seq, loff_t *pos)
+{
+        struct ax25_uid_assoc *pt;
+        int i = 1;
+
+        read_lock(&ax25_uid_lock);
+        if (*pos == 0)
+                return SEQ_START_TOKEN;
+
+        for (pt = ax25_uid_list; pt != NULL; pt = pt->next) {
+                if (i == *pos)
+                        return pt;
+                ++i;
+        }
+        return NULL;
+}
+
+static void *ax25_uid_seq_next(struct seq_file *seq, void *v, loff_t *pos)
+{
+        ++*pos;
+        return (v == SEQ_START_TOKEN) ? ax25_uid_list : 
+                ((struct ax25_uid_assoc *) v)->next;
+}
+
+static void ax25_uid_seq_stop(struct seq_file *seq, void *v)
+{
+        read_unlock(&ax25_uid_lock);
+}
+
+static int ax25_uid_seq_show(struct seq_file *seq, void *v)
+{
+        if (v == SEQ_START_TOKEN)
+                seq_printf(seq, "Policy: %d\n", ax25_uid_policy);
+        else {
+                struct ax25_uid_assoc *pt = v;
+                
+
+                seq_printf(seq, "%6d %s\n", pt->uid, ax2asc(&pt->call));
+        }
+        return 0;
+}
+
+static struct seq_operations ax25_uid_seqops = {
+        .start = ax25_uid_seq_start,
+        .next = ax25_uid_seq_next,
+        .stop = ax25_uid_seq_stop,
+        .show = ax25_uid_seq_show,
+};
+
+static int ax25_uid_info_open(struct inode *inode, struct file *file)
+{
+        return seq_open(file, &ax25_uid_seqops);
+}
+
+struct file_operations ax25_uid_fops = {
+        .owner = THIS_MODULE,
+        .open = ax25_uid_info_open,
+        .read = seq_read,
+        .llseek = seq_lseek,
+        .release = seq_release,
+};
+
+#endif
+
+/*
+ *      Free all memory associated with UID/Callsign structures.
+ */
+void __exit ax25_uid_free(void)
+{
+        ax25_uid_assoc *s, *ax25_uid;
+
+        write_lock(&ax25_uid_lock);
+        ax25_uid = ax25_uid_list;
+        while (ax25_uid != NULL) {
+                s        = ax25_uid;
+                ax25_uid = ax25_uid->next;
+
+                kfree(s);
+        }
+        ax25_uid_list = NULL;
+        write_unlock(&ax25_uid_lock);
+}