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tunnel6: add tunnel6_input_afinfo for ipip and ipv6 tunnels

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This patch is to register a callback function tunnel6_rcv_cb with
is_ipip set in a xfrm_input_afinfo object for tunnel6 and tunnel46.

It will be called by xfrm_rcv_cb() from xfrm_input() when family
is AF_INET6 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
    tunnel6_init/fini(), as Sabrina noticed.
v2->v3:
  - Add "#if IS_ENABLED(CONFIG_INET6_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 20:01:31 +08:00 committed by Steffen Klassert
parent 6df2db5d37
commit 86afc70318
2 changed files with 42 additions and 0 deletions
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1
include/net/xfrm.h
View File

@ -1425,6 +1425,7 @@ struct xfrm_tunnel {
struct xfrm6_tunnel {
int (*handler)(struct sk_buff *skb);
int (*cb_handler)(struct sk_buff *skb, int err);
int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
u8 type, u8 code, int offset, __be32 info);
struct xfrm6_tunnel __rcu *next;

41
net/ipv6/tunnel6.c
View File

@ -155,6 +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;
@ -245,11 +272,25 @@ static int __init tunnel6_init(void)
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))