Adding upstream version 6.1.76.upstream/6.1.76

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 488 insertions, 0 deletions

diff --git a/net/ax25/ax25_route.c b/net/ax25/ax25_route.c
new file mode 100644
index 000000000..b7c4d656a
--- /dev/null
+++ b/net/ax25/ax25_route.c
@@ -0,0 +1,488 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ *
+ * Copyright (C) Alan Cox GW4PTS (alan@lxorguk.ukuu.org.uk)
+ * Copyright (C) Jonathan Naylor G4KLX (g4klx@g4klx.demon.co.uk)
+ * Copyright (C) Steven Whitehouse GW7RRM (stevew@acm.org)
+ * Copyright (C) Joerg Reuter DL1BKE (jreuter@yaina.de)
+ * Copyright (C) Hans-Joachim Hetscher DD8NE (dd8ne@bnv-bamberg.de)
+ * Copyright (C) Frederic Rible F1OAT (frible@teaser.fr)
+ */
+
+#include <linux/capability.h>
+#include <linux/errno.h>
+#include <linux/types.h>
+#include <linux/socket.h>
+#include <linux/timer.h>
+#include <linux/in.h>
+#include <linux/kernel.h>
+#include <linux/sched.h>
+#include <linux/string.h>
+#include <linux/sockios.h>
+#include <linux/net.h>
+#include <linux/slab.h>
+#include <net/ax25.h>
+#include <linux/inet.h>
+#include <linux/netdevice.h>
+#include <linux/if_arp.h>
+#include <linux/skbuff.h>
+#include <linux/spinlock.h>
+#include <net/sock.h>
+#include <linux/uaccess.h>
+#include <linux/fcntl.h>
+#include <linux/mm.h>
+#include <linux/interrupt.h>
+#include <linux/init.h>
+#include <linux/seq_file.h>
+#include <linux/export.h>
+
+static ax25_route *ax25_route_list;
+DEFINE_RWLOCK(ax25_route_lock);
+
+void ax25_rt_device_down(struct net_device *dev)
+{
+	ax25_route *s, *t, *ax25_rt;
+
+	write_lock_bh(&ax25_route_lock);
+	ax25_rt = ax25_route_list;
+	while (ax25_rt != NULL) {
+		s       = ax25_rt;
+		ax25_rt = ax25_rt->next;
+
+		if (s->dev == dev) {
+			if (ax25_route_list == s) {
+				ax25_route_list = s->next;
+				kfree(s->digipeat);
+				kfree(s);
+			} else {
+				for (t = ax25_route_list; t != NULL; t = t->next) {
+					if (t->next == s) {
+						t->next = s->next;
+						kfree(s->digipeat);
+						kfree(s);
+						break;
+					}
+				}
+			}
+		}
+	}
+	write_unlock_bh(&ax25_route_lock);
+}
+
+static int __must_check ax25_rt_add(struct ax25_routes_struct *route)
+{
+	ax25_route *ax25_rt;
+	ax25_dev *ax25_dev;
+	int i;
+
+	if (route->digi_count > AX25_MAX_DIGIS)
+		return -EINVAL;
+
+	ax25_dev = ax25_addr_ax25dev(&route->port_addr);
+	if (!ax25_dev)
+		return -EINVAL;
+
+	write_lock_bh(&ax25_route_lock);
+
+	ax25_rt = ax25_route_list;
+	while (ax25_rt != NULL) {
+		if (ax25cmp(&ax25_rt->callsign, &route->dest_addr) == 0 &&
+			    ax25_rt->dev == ax25_dev->dev) {
+			kfree(ax25_rt->digipeat);
+			ax25_rt->digipeat = NULL;
+			if (route->digi_count != 0) {
+				if ((ax25_rt->digipeat = kmalloc(sizeof(ax25_digi), GFP_ATOMIC)) == NULL) {
+					write_unlock_bh(&ax25_route_lock);
+					ax25_dev_put(ax25_dev);
+					return -ENOMEM;
+				}
+				ax25_rt->digipeat->lastrepeat = -1;
+				ax25_rt->digipeat->ndigi      = route->digi_count;
+				for (i = 0; i < route->digi_count; i++) {
+					ax25_rt->digipeat->repeated[i] = 0;
+					ax25_rt->digipeat->calls[i]    = route->digi_addr[i];
+				}
+			}
+			write_unlock_bh(&ax25_route_lock);
+			ax25_dev_put(ax25_dev);
+			return 0;
+		}
+		ax25_rt = ax25_rt->next;
+	}
+
+	if ((ax25_rt = kmalloc(sizeof(ax25_route), GFP_ATOMIC)) == NULL) {
+		write_unlock_bh(&ax25_route_lock);
+		ax25_dev_put(ax25_dev);
+		return -ENOMEM;
+	}
+
+	ax25_rt->callsign     = route->dest_addr;
+	ax25_rt->dev          = ax25_dev->dev;
+	ax25_rt->digipeat     = NULL;
+	ax25_rt->ip_mode      = ' ';
+	if (route->digi_count != 0) {
+		if ((ax25_rt->digipeat = kmalloc(sizeof(ax25_digi), GFP_ATOMIC)) == NULL) {
+			write_unlock_bh(&ax25_route_lock);
+			kfree(ax25_rt);
+			ax25_dev_put(ax25_dev);
+			return -ENOMEM;
+		}
+		ax25_rt->digipeat->lastrepeat = -1;
+		ax25_rt->digipeat->ndigi      = route->digi_count;
+		for (i = 0; i < route->digi_count; i++) {
+			ax25_rt->digipeat->repeated[i] = 0;
+			ax25_rt->digipeat->calls[i]    = route->digi_addr[i];
+		}
+	}
+	ax25_rt->next   = ax25_route_list;
+	ax25_route_list = ax25_rt;
+	write_unlock_bh(&ax25_route_lock);
+	ax25_dev_put(ax25_dev);
+
+	return 0;
+}
+
+void __ax25_put_route(ax25_route *ax25_rt)
+{
+	kfree(ax25_rt->digipeat);
+	kfree(ax25_rt);
+}
+
+static int ax25_rt_del(struct ax25_routes_struct *route)
+{
+	ax25_route *s, *t, *ax25_rt;
+	ax25_dev *ax25_dev;
+
+	if ((ax25_dev = ax25_addr_ax25dev(&route->port_addr)) == NULL)
+		return -EINVAL;
+
+	write_lock_bh(&ax25_route_lock);
+
+	ax25_rt = ax25_route_list;
+	while (ax25_rt != NULL) {
+		s       = ax25_rt;
+		ax25_rt = ax25_rt->next;
+		if (s->dev == ax25_dev->dev &&
+		    ax25cmp(&route->dest_addr, &s->callsign) == 0) {
+			if (ax25_route_list == s) {
+				ax25_route_list = s->next;
+				__ax25_put_route(s);
+			} else {
+				for (t = ax25_route_list; t != NULL; t = t->next) {
+					if (t->next == s) {
+						t->next = s->next;
+						__ax25_put_route(s);
+						break;
+					}
+				}
+			}
+		}
+	}
+	write_unlock_bh(&ax25_route_lock);
+	ax25_dev_put(ax25_dev);
+
+	return 0;
+}
+
+static int ax25_rt_opt(struct ax25_route_opt_struct *rt_option)
+{
+	ax25_route *ax25_rt;
+	ax25_dev *ax25_dev;
+	int err = 0;
+
+	if ((ax25_dev = ax25_addr_ax25dev(&rt_option->port_addr)) == NULL)
+		return -EINVAL;
+
+	write_lock_bh(&ax25_route_lock);
+
+	ax25_rt = ax25_route_list;
+	while (ax25_rt != NULL) {
+		if (ax25_rt->dev == ax25_dev->dev &&
+		    ax25cmp(&rt_option->dest_addr, &ax25_rt->callsign) == 0) {
+			switch (rt_option->cmd) {
+			case AX25_SET_RT_IPMODE:
+				switch (rt_option->arg) {
+				case ' ':
+				case 'D':
+				case 'V':
+					ax25_rt->ip_mode = rt_option->arg;
+					break;
+				default:
+					err = -EINVAL;
+					goto out;
+				}
+				break;
+			default:
+				err = -EINVAL;
+				goto out;
+			}
+		}
+		ax25_rt = ax25_rt->next;
+	}
+
+out:
+	write_unlock_bh(&ax25_route_lock);
+	ax25_dev_put(ax25_dev);
+	return err;
+}
+
+int ax25_rt_ioctl(unsigned int cmd, void __user *arg)
+{
+	struct ax25_route_opt_struct rt_option;
+	struct ax25_routes_struct route;
+
+	switch (cmd) {
+	case SIOCADDRT:
+		if (copy_from_user(&route, arg, sizeof(route)))
+			return -EFAULT;
+		return ax25_rt_add(&route);
+
+	case SIOCDELRT:
+		if (copy_from_user(&route, arg, sizeof(route)))
+			return -EFAULT;
+		return ax25_rt_del(&route);
+
+	case SIOCAX25OPTRT:
+		if (copy_from_user(&rt_option, arg, sizeof(rt_option)))
+			return -EFAULT;
+		return ax25_rt_opt(&rt_option);
+
+	default:
+		return -EINVAL;
+	}
+}
+
+#ifdef CONFIG_PROC_FS
+
+static void *ax25_rt_seq_start(struct seq_file *seq, loff_t *pos)
+	__acquires(ax25_route_lock)
+{
+	struct ax25_route *ax25_rt;
+	int i = 1;
+
+	read_lock(&ax25_route_lock);
+	if (*pos == 0)
+		return SEQ_START_TOKEN;
+
+	for (ax25_rt = ax25_route_list; ax25_rt != NULL; ax25_rt = ax25_rt->next) {
+		if (i == *pos)
+			return ax25_rt;
+		++i;
+	}
+
+	return NULL;
+}
+
+static void *ax25_rt_seq_next(struct seq_file *seq, void *v, loff_t *pos)
+{
+	++*pos;
+	return (v == SEQ_START_TOKEN) ? ax25_route_list :
+		((struct ax25_route *) v)->next;
+}
+
+static void ax25_rt_seq_stop(struct seq_file *seq, void *v)
+	__releases(ax25_route_lock)
+{
+	read_unlock(&ax25_route_lock);
+}
+
+static int ax25_rt_seq_show(struct seq_file *seq, void *v)
+{
+	char buf[11];
+
+	if (v == SEQ_START_TOKEN)
+		seq_puts(seq, "callsign  dev  mode digipeaters\n");
+	else {
+		struct ax25_route *ax25_rt = v;
+		const char *callsign;
+		int i;
+
+		if (ax25cmp(&ax25_rt->callsign, &null_ax25_address) == 0)
+			callsign = "default";
+		else
+			callsign = ax2asc(buf, &ax25_rt->callsign);
+
+		seq_printf(seq, "%-9s %-4s",
+			callsign,
+			ax25_rt->dev ? ax25_rt->dev->name : "???");
+
+		switch (ax25_rt->ip_mode) {
+		case 'V':
+			seq_puts(seq, "   vc");
+			break;
+		case 'D':
+			seq_puts(seq, "   dg");
+			break;
+		default:
+			seq_puts(seq, "    *");
+			break;
+		}
+
+		if (ax25_rt->digipeat != NULL)
+			for (i = 0; i < ax25_rt->digipeat->ndigi; i++)
+				seq_printf(seq, " %s",
+				     ax2asc(buf, &ax25_rt->digipeat->calls[i]));
+
+		seq_puts(seq, "\n");
+	}
+	return 0;
+}
+
+const struct seq_operations ax25_rt_seqops = {
+	.start = ax25_rt_seq_start,
+	.next = ax25_rt_seq_next,
+	.stop = ax25_rt_seq_stop,
+	.show = ax25_rt_seq_show,
+};
+#endif
+
+/*
+ *	Find AX.25 route
+ *
+ *	Only routes with a reference count of zero can be destroyed.
+ *	Must be called with ax25_route_lock read locked.
+ */
+ax25_route *ax25_get_route(ax25_address *addr, struct net_device *dev)
+{
+	ax25_route *ax25_spe_rt = NULL;
+	ax25_route *ax25_def_rt = NULL;
+	ax25_route *ax25_rt;
+
+	/*
+	 *	Bind to the physical interface we heard them on, or the default
+	 *	route if none is found;
+	 */
+	for (ax25_rt = ax25_route_list; ax25_rt != NULL; ax25_rt = ax25_rt->next) {
+		if (dev == NULL) {
+			if (ax25cmp(&ax25_rt->callsign, addr) == 0 && ax25_rt->dev != NULL)
+				ax25_spe_rt = ax25_rt;
+			if (ax25cmp(&ax25_rt->callsign, &null_ax25_address) == 0 && ax25_rt->dev != NULL)
+				ax25_def_rt = ax25_rt;
+		} else {
+			if (ax25cmp(&ax25_rt->callsign, addr) == 0 && ax25_rt->dev == dev)
+				ax25_spe_rt = ax25_rt;
+			if (ax25cmp(&ax25_rt->callsign, &null_ax25_address) == 0 && ax25_rt->dev == dev)
+				ax25_def_rt = ax25_rt;
+		}
+	}
+
+	ax25_rt = ax25_def_rt;
+	if (ax25_spe_rt != NULL)
+		ax25_rt = ax25_spe_rt;
+
+	return ax25_rt;
+}
+
+/*
+ *	Adjust path: If you specify a default route and want to connect
+ *      a target on the digipeater path but w/o having a special route
+ *	set before, the path has to be truncated from your target on.
+ */
+static inline void ax25_adjust_path(ax25_address *addr, ax25_digi *digipeat)
+{
+	int k;
+
+	for (k = 0; k < digipeat->ndigi; k++) {
+		if (ax25cmp(addr, &digipeat->calls[k]) == 0)
+			break;
+	}
+
+	digipeat->ndigi = k;
+}
+
+
+/*
+ *	Find which interface to use.
+ */
+int ax25_rt_autobind(ax25_cb *ax25, ax25_address *addr)
+{
+	ax25_uid_assoc *user;
+	ax25_route *ax25_rt;
+	int err = 0;
+
+	ax25_route_lock_use();
+	ax25_rt = ax25_get_route(addr, NULL);
+	if (!ax25_rt) {
+		ax25_route_lock_unuse();
+		return -EHOSTUNREACH;
+	}
+	if ((ax25->ax25_dev = ax25_dev_ax25dev(ax25_rt->dev)) == NULL) {
+		err = -EHOSTUNREACH;
+		goto put;
+	}
+
+	user = ax25_findbyuid(current_euid());
+	if (user) {
+		ax25->source_addr = user->call;
+		ax25_uid_put(user);
+	} else {
+		if (ax25_uid_policy && !capable(CAP_NET_BIND_SERVICE)) {
+			err = -EPERM;
+			goto put;
+		}
+		ax25->source_addr = *(ax25_address *)ax25->ax25_dev->dev->dev_addr;
+	}
+
+	if (ax25_rt->digipeat != NULL) {
+		ax25->digipeat = kmemdup(ax25_rt->digipeat, sizeof(ax25_digi),
+					 GFP_ATOMIC);
+		if (ax25->digipeat == NULL) {
+			err = -ENOMEM;
+			goto put;
+		}
+		ax25_adjust_path(addr, ax25->digipeat);
+	}
+
+	if (ax25->sk != NULL) {
+		local_bh_disable();
+		bh_lock_sock(ax25->sk);
+		sock_reset_flag(ax25->sk, SOCK_ZAPPED);
+		bh_unlock_sock(ax25->sk);
+		local_bh_enable();
+	}
+
+put:
+	ax25_route_lock_unuse();
+	return err;
+}
+
+struct sk_buff *ax25_rt_build_path(struct sk_buff *skb, ax25_address *src,
+	ax25_address *dest, ax25_digi *digi)
+{
+	unsigned char *bp;
+	int len;
+
+	len = digi->ndigi * AX25_ADDR_LEN;
+
+	if (unlikely(skb_headroom(skb) < len)) {
+		skb = skb_expand_head(skb, len);
+		if (!skb) {
+			printk(KERN_CRIT "AX.25: ax25_dg_build_path - out of memory\n");
+			return NULL;
+		}
+	}
+
+	bp = skb_push(skb, len);
+
+	ax25_addr_build(bp, src, dest, digi, AX25_COMMAND, AX25_MODULUS);
+
+	return skb;
+}
+
+/*
+ *	Free all memory associated with routing structures.
+ */
+void __exit ax25_rt_free(void)
+{
+	ax25_route *s, *ax25_rt = ax25_route_list;
+
+	write_lock_bh(&ax25_route_lock);
+	while (ax25_rt != NULL) {
+		s       = ax25_rt;
+		ax25_rt = ax25_rt->next;
+
+		kfree(s->digipeat);
+		kfree(s);
+	}
+	write_unlock_bh(&ax25_route_lock);
+}