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Diffstat (limited to 'net/ipv6/tunnel6.c')
-rw-r--r--net/ipv6/tunnel6.c143
1 files changed, 126 insertions, 17 deletions
diff --git a/net/ipv6/tunnel6.c b/net/ipv6/tunnel6.c
index 1991dede7367..dc4ea9b11794 100644
--- a/net/ipv6/tunnel6.c
+++ b/net/ipv6/tunnel6.c
@@ -1,19 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Copyright (C)2003,2004 USAGI/WIDE Project
*
- * 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.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, see <http://www.gnu.org/licenses/>.
- *
* Authors Mitsuru KANDA <mk@linux-ipv6.org>
* YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
*/
@@ -33,8 +21,14 @@
static struct xfrm6_tunnel __rcu *tunnel6_handlers __read_mostly;
static struct xfrm6_tunnel __rcu *tunnel46_handlers __read_mostly;
+static struct xfrm6_tunnel __rcu *tunnelmpls6_handlers __read_mostly;
static DEFINE_MUTEX(tunnel6_mutex);
+static inline int xfrm6_tunnel_mpls_supported(void)
+{
+ return IS_ENABLED(CONFIG_MPLS);
+}
+
int xfrm6_tunnel_register(struct xfrm6_tunnel *handler, unsigned short family)
{
struct xfrm6_tunnel __rcu **pprev;
@@ -44,8 +38,21 @@ int xfrm6_tunnel_register(struct xfrm6_tunnel *handler, unsigned short family)
mutex_lock(&tunnel6_mutex);
- for (pprev = (family == AF_INET6) ? &tunnel6_handlers : &tunnel46_handlers;
- (t = rcu_dereference_protected(*pprev,
+ switch (family) {
+ case AF_INET6:
+ pprev = &tunnel6_handlers;
+ break;
+ case AF_INET:
+ pprev = &tunnel46_handlers;
+ break;
+ case AF_MPLS:
+ pprev = &tunnelmpls6_handlers;
+ break;
+ default:
+ goto err;
+ }
+
+ for (; (t = rcu_dereference_protected(*pprev,
lockdep_is_held(&tunnel6_mutex))) != NULL;
pprev = &t->next) {
if (t->priority > priority)
@@ -74,8 +81,21 @@ int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler, unsigned short family)
mutex_lock(&tunnel6_mutex);
- for (pprev = (family == AF_INET6) ? &tunnel6_handlers : &tunnel46_handlers;
- (t = rcu_dereference_protected(*pprev,
+ switch (family) {
+ case AF_INET6:
+ pprev = &tunnel6_handlers;
+ break;
+ case AF_INET:
+ pprev = &tunnel46_handlers;
+ break;
+ case AF_MPLS:
+ pprev = &tunnelmpls6_handlers;
+ break;
+ default:
+ goto err;
+ }
+
+ for (; (t = rcu_dereference_protected(*pprev,
lockdep_is_held(&tunnel6_mutex))) != NULL;
pprev = &t->next) {
if (t == handler) {
@@ -85,6 +105,7 @@ int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler, unsigned short family)
}
}
+err:
mutex_unlock(&tunnel6_mutex);
synchronize_net();
@@ -98,6 +119,24 @@ EXPORT_SYMBOL(xfrm6_tunnel_deregister);
handler != NULL; \
handler = rcu_dereference(handler->next)) \
+static int tunnelmpls6_rcv(struct sk_buff *skb)
+{
+ struct xfrm6_tunnel *handler;
+
+ if (!pskb_may_pull(skb, sizeof(struct ipv6hdr)))
+ goto drop;
+
+ for_each_tunnel_rcu(tunnelmpls6_handlers, handler)
+ if (!handler->handler(skb))
+ return 0;
+
+ icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0);
+
+drop:
+ kfree_skb(skb);
+ return 0;
+}
+
static int tunnel6_rcv(struct sk_buff *skb)
{
struct xfrm6_tunnel *handler;
@@ -116,6 +155,33 @@ drop:
return 0;
}
+#if IS_ENABLED(CONFIG_INET6_XFRM_TUNNEL)
+static int tunnel6_rcv_cb(struct sk_buff *skb, u8 proto, int err)
+{
+ struct xfrm6_tunnel __rcu *head;
+ struct xfrm6_tunnel *handler;
+ int ret;
+
+ head = (proto == IPPROTO_IPV6) ? tunnel6_handlers : tunnel46_handlers;
+
+ for_each_tunnel_rcu(head, handler) {
+ if (handler->cb_handler) {
+ ret = handler->cb_handler(skb, err);
+ if (ret <= 0)
+ return ret;
+ }
+ }
+
+ return 0;
+}
+
+static const struct xfrm_input_afinfo tunnel6_input_afinfo = {
+ .family = AF_INET6,
+ .is_ipip = true,
+ .callback = tunnel6_rcv_cb,
+};
+#endif
+
static int tunnel46_rcv(struct sk_buff *skb)
{
struct xfrm6_tunnel *handler;
@@ -158,6 +224,18 @@ static int tunnel46_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
return -ENOENT;
}
+static int tunnelmpls6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
+ u8 type, u8 code, int offset, __be32 info)
+{
+ struct xfrm6_tunnel *handler;
+
+ for_each_tunnel_rcu(tunnelmpls6_handlers, handler)
+ if (!handler->err_handler(skb, opt, type, code, offset, info))
+ return 0;
+
+ return -ENOENT;
+}
+
static const struct inet6_protocol tunnel6_protocol = {
.handler = tunnel6_rcv,
.err_handler = tunnel6_err,
@@ -170,6 +248,12 @@ static const struct inet6_protocol tunnel46_protocol = {
.flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
};
+static const struct inet6_protocol tunnelmpls6_protocol = {
+ .handler = tunnelmpls6_rcv,
+ .err_handler = tunnelmpls6_err,
+ .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
+};
+
static int __init tunnel6_init(void)
{
if (inet6_add_protocol(&tunnel6_protocol, IPPROTO_IPV6)) {
@@ -181,17 +265,42 @@ static int __init tunnel6_init(void)
inet6_del_protocol(&tunnel6_protocol, IPPROTO_IPV6);
return -EAGAIN;
}
+ if (xfrm6_tunnel_mpls_supported() &&
+ inet6_add_protocol(&tunnelmpls6_protocol, IPPROTO_MPLS)) {
+ pr_err("%s: can't add protocol\n", __func__);
+ inet6_del_protocol(&tunnel6_protocol, IPPROTO_IPV6);
+ inet6_del_protocol(&tunnel46_protocol, IPPROTO_IPIP);
+ return -EAGAIN;
+ }
+#if IS_ENABLED(CONFIG_INET6_XFRM_TUNNEL)
+ if (xfrm_input_register_afinfo(&tunnel6_input_afinfo)) {
+ pr_err("%s: can't add input afinfo\n", __func__);
+ inet6_del_protocol(&tunnel6_protocol, IPPROTO_IPV6);
+ inet6_del_protocol(&tunnel46_protocol, IPPROTO_IPIP);
+ if (xfrm6_tunnel_mpls_supported())
+ inet6_del_protocol(&tunnelmpls6_protocol, IPPROTO_MPLS);
+ return -EAGAIN;
+ }
+#endif
return 0;
}
static void __exit tunnel6_fini(void)
{
+#if IS_ENABLED(CONFIG_INET6_XFRM_TUNNEL)
+ if (xfrm_input_unregister_afinfo(&tunnel6_input_afinfo))
+ pr_err("%s: can't remove input afinfo\n", __func__);
+#endif
if (inet6_del_protocol(&tunnel46_protocol, IPPROTO_IPIP))
pr_err("%s: can't remove protocol\n", __func__);
if (inet6_del_protocol(&tunnel6_protocol, IPPROTO_IPV6))
pr_err("%s: can't remove protocol\n", __func__);
+ if (xfrm6_tunnel_mpls_supported() &&
+ inet6_del_protocol(&tunnelmpls6_protocol, IPPROTO_MPLS))
+ pr_err("%s: can't remove protocol\n", __func__);
}
module_init(tunnel6_init);
module_exit(tunnel6_fini);
+MODULE_DESCRIPTION("IP-in-IPv6 tunnel driver");
MODULE_LICENSE("GPL");
generated by cgit (git 2.34.1) at 2025-12-24 23:28:01 +0000