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authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /net/ax25/ax25_uid.c
downloadlinux-stericsson-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.tar.gz
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
Diffstat (limited to 'net/ax25/ax25_uid.c')
-rw-r--r--net/ax25/ax25_uid.c228
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);
+}