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linux-next/net/ipv4/tunnel4.c
Xin Long 6df2db5d37 tunnel4: add cb_handler to struct xfrm_tunnel 
This patch is to register a callback function tunnel4_rcv_cb with
is_ipip set in a xfrm_input_afinfo object for tunnel4 and tunnel64.

It will be called by xfrm_rcv_cb() from xfrm_input() when family
is AF_INET and proto is IPPROTO_IPIP or IPPROTO_IPV6.

v1->v2:
  - Fix a sparse warning caused by the missing "__rcu", as Jakub
    noticed.
  - Handle the err returned by xfrm_input_register_afinfo() in
    tunnel4_init/fini(), as Sabrina noticed.
v2->v3:
  - Add "#if IS_ENABLED(CONFIG_INET_XFRM_TUNNEL)" to fix the build error
    when xfrm is disabled, reported by kbuild test robot.

Signed-off-by: Xin Long <lucien.xin@gmail.com>
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
2020-07-09 12:51:36 +02:00

301 lines
6.5 KiB
C
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// SPDX-License-Identifier: GPL-2.0-only
/* tunnel4.c: Generic IP tunnel transformer.
*
* Copyright (C) 2003 David S. Miller (davem@redhat.com)
*/
#include <linux/init.h>
#include <linux/module.h>
#include <linux/mutex.h>
#include <linux/mpls.h>
#include <linux/netdevice.h>
#include <linux/skbuff.h>
#include <linux/slab.h>
#include <net/icmp.h>
#include <net/ip.h>
#include <net/protocol.h>
#include <net/xfrm.h>
static struct xfrm_tunnel __rcu *tunnel4_handlers __read_mostly;
static struct xfrm_tunnel __rcu *tunnel64_handlers __read_mostly;
static struct xfrm_tunnel __rcu *tunnelmpls4_handlers __read_mostly;
static DEFINE_MUTEX(tunnel4_mutex);
static inline struct xfrm_tunnel __rcu **fam_handlers(unsigned short family)
{
return (family == AF_INET) ? &tunnel4_handlers :
(family == AF_INET6) ? &tunnel64_handlers :
&tunnelmpls4_handlers;
}
int xfrm4_tunnel_register(struct xfrm_tunnel *handler, unsigned short family)
{
struct xfrm_tunnel __rcu **pprev;
struct xfrm_tunnel *t;
int ret = -EEXIST;
int priority = handler->priority;
mutex_lock(&tunnel4_mutex);
for (pprev = fam_handlers(family);
(t = rcu_dereference_protected(*pprev,
lockdep_is_held(&tunnel4_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(&tunnel4_mutex);
return ret;
}
EXPORT_SYMBOL(xfrm4_tunnel_register);
int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler, unsigned short family)
{
struct xfrm_tunnel __rcu **pprev;
struct xfrm_tunnel *t;
int ret = -ENOENT;
mutex_lock(&tunnel4_mutex);
for (pprev = fam_handlers(family);
(t = rcu_dereference_protected(*pprev,
lockdep_is_held(&tunnel4_mutex))) != NULL;
pprev = &t->next) {
if (t == handler) {
*pprev = handler->next;
ret = 0;
break;
}
}
mutex_unlock(&tunnel4_mutex);
synchronize_net();
return ret;
}
EXPORT_SYMBOL(xfrm4_tunnel_deregister);
#define for_each_tunnel_rcu(head, handler) \
for (handler = rcu_dereference(head); \
handler != NULL; \
handler = rcu_dereference(handler->next)) \
static int tunnel4_rcv(struct sk_buff *skb)
{
struct xfrm_tunnel *handler;
if (!pskb_may_pull(skb, sizeof(struct iphdr)))
goto drop;
for_each_tunnel_rcu(tunnel4_handlers, handler)
if (!handler->handler(skb))
return 0;
icmp_send(skb, ICMP_DEST_UNREACH, ICMP_PORT_UNREACH, 0);
drop:
kfree_skb(skb);
return 0;
}
#if IS_ENABLED(CONFIG_INET_XFRM_TUNNEL)
static int tunnel4_rcv_cb(struct sk_buff *skb, u8 proto, int err)
{
struct xfrm_tunnel __rcu *head;
struct xfrm_tunnel *handler;
int ret;
head = (proto == IPPROTO_IPIP) ? tunnel4_handlers : tunnel64_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 tunnel4_input_afinfo = {
.family = AF_INET,
.is_ipip = true,
.callback = tunnel4_rcv_cb,
};
#endif
#if IS_ENABLED(CONFIG_IPV6)
static int tunnel64_rcv(struct sk_buff *skb)
{
struct xfrm_tunnel *handler;
if (!pskb_may_pull(skb, sizeof(struct ipv6hdr)))
goto drop;
for_each_tunnel_rcu(tunnel64_handlers, handler)
if (!handler->handler(skb))
return 0;
icmp_send(skb, ICMP_DEST_UNREACH, ICMP_PORT_UNREACH, 0);
drop:
kfree_skb(skb);
return 0;
}
#endif
#if IS_ENABLED(CONFIG_MPLS)
static int tunnelmpls4_rcv(struct sk_buff *skb)
{
struct xfrm_tunnel *handler;
if (!pskb_may_pull(skb, sizeof(struct mpls_label)))
goto drop;
for_each_tunnel_rcu(tunnelmpls4_handlers, handler)
if (!handler->handler(skb))
return 0;
icmp_send(skb, ICMP_DEST_UNREACH, ICMP_PORT_UNREACH, 0);
drop:
kfree_skb(skb);
return 0;
}
#endif
static int tunnel4_err(struct sk_buff *skb, u32 info)
{
struct xfrm_tunnel *handler;
for_each_tunnel_rcu(tunnel4_handlers, handler)
if (!handler->err_handler(skb, info))
return 0;
return -ENOENT;
}
#if IS_ENABLED(CONFIG_IPV6)
static int tunnel64_err(struct sk_buff *skb, u32 info)
{
struct xfrm_tunnel *handler;
for_each_tunnel_rcu(tunnel64_handlers, handler)
if (!handler->err_handler(skb, info))
return 0;
return -ENOENT;
}
#endif
#if IS_ENABLED(CONFIG_MPLS)
static int tunnelmpls4_err(struct sk_buff *skb, u32 info)
{
struct xfrm_tunnel *handler;
for_each_tunnel_rcu(tunnelmpls4_handlers, handler)
if (!handler->err_handler(skb, info))
return 0;
return -ENOENT;
}
#endif
static const struct net_protocol tunnel4_protocol = {
.handler = tunnel4_rcv,
.err_handler = tunnel4_err,
.no_policy = 1,
.netns_ok = 1,
};
#if IS_ENABLED(CONFIG_IPV6)
static const struct net_protocol tunnel64_protocol = {
.handler = tunnel64_rcv,
.err_handler = tunnel64_err,
.no_policy = 1,
.netns_ok = 1,
};
#endif
#if IS_ENABLED(CONFIG_MPLS)
static const struct net_protocol tunnelmpls4_protocol = {
.handler = tunnelmpls4_rcv,
.err_handler = tunnelmpls4_err,
.no_policy = 1,
.netns_ok = 1,
};
#endif
static int __init tunnel4_init(void)
{
if (inet_add_protocol(&tunnel4_protocol, IPPROTO_IPIP))
goto err;
#if IS_ENABLED(CONFIG_IPV6)
if (inet_add_protocol(&tunnel64_protocol, IPPROTO_IPV6)) {
inet_del_protocol(&tunnel4_protocol, IPPROTO_IPIP);
goto err;
}
#endif
#if IS_ENABLED(CONFIG_MPLS)
if (inet_add_protocol(&tunnelmpls4_protocol, IPPROTO_MPLS)) {
inet_del_protocol(&tunnel4_protocol, IPPROTO_IPIP);
#if IS_ENABLED(CONFIG_IPV6)
inet_del_protocol(&tunnel64_protocol, IPPROTO_IPV6);
#endif
goto err;
}
#endif
#if IS_ENABLED(CONFIG_INET_XFRM_TUNNEL)
if (xfrm_input_register_afinfo(&tunnel4_input_afinfo)) {
inet_del_protocol(&tunnel4_protocol, IPPROTO_IPIP);
#if IS_ENABLED(CONFIG_IPV6)
inet_del_protocol(&tunnel64_protocol, IPPROTO_IPV6);
#endif
#if IS_ENABLED(CONFIG_MPLS)
inet_del_protocol(&tunnelmpls4_protocol, IPPROTO_MPLS);
#endif
goto err;
}
#endif
return 0;
err:
pr_err("%s: can't add protocol\n", __func__);
return -EAGAIN;
}
static void __exit tunnel4_fini(void)
{
#if IS_ENABLED(CONFIG_INET_XFRM_TUNNEL)
if (xfrm_input_unregister_afinfo(&tunnel4_input_afinfo))
pr_err("tunnel4 close: can't remove input afinfo\n");
#endif
#if IS_ENABLED(CONFIG_MPLS)
if (inet_del_protocol(&tunnelmpls4_protocol, IPPROTO_MPLS))
pr_err("tunnelmpls4 close: can't remove protocol\n");
#endif
#if IS_ENABLED(CONFIG_IPV6)
if (inet_del_protocol(&tunnel64_protocol, IPPROTO_IPV6))
pr_err("tunnel64 close: can't remove protocol\n");
#endif
if (inet_del_protocol(&tunnel4_protocol, IPPROTO_IPIP))
pr_err("tunnel4 close: can't remove protocol\n");
}
module_init(tunnel4_init);
module_exit(tunnel4_fini);
MODULE_LICENSE("GPL");
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