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-rw-r--r--net/ax25/ax25_route.c488
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);
+}
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