netdev - [PATCH ipsec-next 02/10] tunnel4: add cb_handler to struct xfrm

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Date:   Wed, 17 Jun 2020 01:36:27 +0800
From:   Xin Long <lucien.xin@...il.com>
To:     netdev@...r.kernel.org
Cc:     Steffen Klassert <steffen.klassert@...unet.com>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        "David S. Miller" <davem@...emloft.net>,
        Sabrina Dubroca <sd@...asysnail.net>
Subject: [PATCH ipsec-next 02/10] 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.

Signed-off-by: Xin Long <lucien.xin@...il.com>
---
 include/net/xfrm.h |  1 +
 net/ipv4/tunnel4.c | 26 ++++++++++++++++++++++++++
 2 files changed, 27 insertions(+)

diff --git a/include/net/xfrm.h b/include/net/xfrm.h
index 4aa118d..c69410d 100644
--- a/include/net/xfrm.h
+++ b/include/net/xfrm.h
@@ -1415,6 +1415,7 @@ 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;
diff --git a/net/ipv4/tunnel4.c b/net/ipv4/tunnel4.c
index c4b2ccb..5968d78 100644
--- a/net/ipv4/tunnel4.c
+++ b/net/ipv4/tunnel4.c
@@ -110,6 +110,30 @@ static int tunnel4_rcv(struct sk_buff *skb)
 	return 0;
 }
 
+static int tunnel4_rcv_cb(struct sk_buff *skb, u8 proto, int err)
+{
+	struct xfrm_tunnel *head, *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,
+};
+
 #if IS_ENABLED(CONFIG_IPV6)
 static int tunnel64_rcv(struct sk_buff *skb)
 {
@@ -231,6 +255,7 @@ static int __init tunnel4_init(void)
 		goto err;
 	}
 #endif
+	xfrm_input_register_afinfo(&tunnel4_input_afinfo);
 	return 0;
 
 err:
@@ -240,6 +265,7 @@ static int __init tunnel4_init(void)
 
 static void __exit tunnel4_fini(void)
 {
+	xfrm_input_unregister_afinfo(&tunnel4_input_afinfo);
 #if IS_ENABLED(CONFIG_MPLS)
 	if (inet_del_protocol(&tunnelmpls4_protocol, IPPROTO_MPLS))
 		pr_err("tunnelmpls4 close: can't remove protocol\n");
-- 
2.1.0