306 lines
7.0 KiB
C
306 lines
7.0 KiB
C
|
// SPDX-License-Identifier: GPL-2.0-or-later
|
||
|
|
/*
|
||
|
|
* Copyright (C)2003,2004 USAGI/WIDE Project
|
||
|
|
*
|
||
|
|
* Authors Mitsuru KANDA <mk@linux-ipv6.org>
|
||
|
|
* YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
|
||
|
|
*/
|
||
|
|
|
||
|
|
#define pr_fmt(fmt) "IPv6: " fmt
|
||
|
|
|
||
|
|
#include <linux/icmpv6.h>
|
||
|
|
#include <linux/init.h>
|
||
|
|
#include <linux/module.h>
|
||
|
|
#include <linux/mutex.h>
|
||
|
|
#include <linux/netdevice.h>
|
||
|
|
#include <linux/skbuff.h>
|
||
|
|
#include <linux/slab.h>
|
||
|
|
#include <net/ipv6.h>
|
||
|
|
#include <net/protocol.h>
|
||
|
|
#include <net/xfrm.h>
|
||
|
|
|
||
|
|
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;
|
||
|
|
struct xfrm6_tunnel *t;
|
||
|
|
int ret = -EEXIST;
|
||
|
|
int priority = handler->priority;
|
||
|
|
|
||
|
|
mutex_lock(&tunnel6_mutex);
|
||
|
|
|
||
|
|
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)
|
||
|
|
break;
|
||
|
|
if (t->priority == priority)
|
||
|
|
goto err;
|
||
|
|
}
|
||
|
|
|
||
|
|
handler->next = *pprev;
|
||
|
|
rcu_assign_pointer(*pprev, handler);
|
||
|
|
|
||
|
|
ret = 0;
|
||
|
|
|
||
|
|
err:
|
||
|
|
mutex_unlock(&tunnel6_mutex);
|
||
|
|
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
EXPORT_SYMBOL(xfrm6_tunnel_register);
|
||
|
|
|
||
|
|
int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler, unsigned short family)
|
||
|
|
{
|
||
|
|
struct xfrm6_tunnel __rcu **pprev;
|
||
|
|
struct xfrm6_tunnel *t;
|
||
|
|
int ret = -ENOENT;
|
||
|
|
|
||
|
|
mutex_lock(&tunnel6_mutex);
|
||
|
|
|
||
|
|
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) {
|
||
|
|
*pprev = handler->next;
|
||
|
|
ret = 0;
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
err:
|
||
|
|
mutex_unlock(&tunnel6_mutex);
|
||
|
|
|
||
|
|
synchronize_net();
|
||
|
|
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
EXPORT_SYMBOL(xfrm6_tunnel_deregister);
|
||
|
|
|
||
|
|
#define for_each_tunnel_rcu(head, handler) \
|
||
|
|
for (handler = rcu_dereference(head); \
|
||
|
|
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;
|
||
|
|
|
||
|
|
if (!pskb_may_pull(skb, sizeof(struct ipv6hdr)))
|
||
|
|
goto drop;
|
||
|
|
|
||
|
|
for_each_tunnel_rcu(tunnel6_handlers, handler)
|
||
|
|
if (!handler->handler(skb))
|
||
|
|
return 0;
|
||
|
|
|
||
|
|
icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0);
|
||
|
|
|
||
|
|
drop:
|
||
|
|
kfree_skb(skb);
|
||
|
|
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;
|
||
|
|
|
||
|
|
if (!pskb_may_pull(skb, sizeof(struct iphdr)))
|
||
|
|
goto drop;
|
||
|
|
|
||
|
|
for_each_tunnel_rcu(tunnel46_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_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(tunnel6_handlers, handler)
|
||
|
|
if (!handler->err_handler(skb, opt, type, code, offset, info))
|
||
|
|
return 0;
|
||
|
|
|
||
|
|
return -ENOENT;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int tunnel46_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(tunnel46_handlers, handler)
|
||
|
|
if (!handler->err_handler(skb, opt, type, code, offset, info))
|
||
|
|
return 0;
|
||
|
|
|
||
|
|
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,
|
||
|
|
.flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
|
||
|
|
};
|
||
|
|
|
||
|
|
static const struct inet6_protocol tunnel46_protocol = {
|
||
|
|
.handler = tunnel46_rcv,
|
||
|
|
.err_handler = tunnel46_err,
|
||
|
|
.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)) {
|
||
|
|
pr_err("%s: can't add protocol\n", __func__);
|
||
|
|
return -EAGAIN;
|
||
|
|
}
|
||
|
|
if (inet6_add_protocol(&tunnel46_protocol, IPPROTO_IPIP)) {
|
||
|
|
pr_err("%s: can't add protocol\n", __func__);
|
||
|
|
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_LICENSE("GPL");
|