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tunnel4: add cb_handler to struct xfrm_tunnel

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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>
This commit is contained in:
Xin Long 2020-07-06 20:01:30 +08:00 committed by Steffen Klassert
parent 1475ee0ac9
commit 6df2db5d37
2 changed files with 44 additions and 0 deletions
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1
include/net/xfrm.h
View File

@ -1416,6 +1416,7 @@ struct xfrm6_protocol {
/* XFRM tunnel handlers. */
struct xfrm_tunnel {
int (*handler)(struct sk_buff *skb);
int (*cb_handler)(struct sk_buff *skb, int err);
int (*err_handler)(struct sk_buff *skb, u32 info);
struct xfrm_tunnel __rcu *next;

43
net/ipv4/tunnel4.c
View File

@ -110,6 +110,33 @@ static int tunnel4_rcv(struct sk_buff *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)
{
@ -230,6 +257,18 @@ static int __init tunnel4_init(void)
#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;
@ -240,6 +279,10 @@ static int __init tunnel4_init(void)
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");