netdev - [PATCHv2 ipsec-next 10/10] xfrm: interface: support IPIP and IPIP6 tunnels processing with .cb

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Message-Id: <6fe4c44a598a64b55e08947851995e6d0aec6a93.1593502515.git.lucien.xin@gmail.com>
Date:   Tue, 30 Jun 2020 15:36:35 +0800
From:   Xin Long <lucien.xin@...il.com>
To:     netdev@...r.kernel.org
Cc:     Jakub Kicinski <jakub.kicinski@...ronome.com>,
        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: [PATCHv2 ipsec-next 10/10] xfrm: interface: support IPIP and IPIP6 tunnels processing with .cb_handler

Similar to ip_vti, IPIP and IPIP6 tunnels processing can easily
be done with .cb_handler for xfrm interface.

Signed-off-by: Xin Long <lucien.xin@...il.com>
---
 net/xfrm/xfrm_interface.c | 24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)

diff --git a/net/xfrm/xfrm_interface.c b/net/xfrm/xfrm_interface.c
index 7be4d0d..0ddcd57 100644
--- a/net/xfrm/xfrm_interface.c
+++ b/net/xfrm/xfrm_interface.c
@@ -840,6 +840,18 @@ static struct xfrm4_protocol xfrmi_ipcomp4_protocol __read_mostly = {
 	.priority	=	10,
 };
 
+static int xfrmi4_rcv_tunnel(struct sk_buff *skb)
+{
+	return xfrm4_rcv_spi(skb, IPPROTO_IPIP, ip_hdr(skb)->saddr);
+}
+
+static struct xfrm_tunnel xfrmi_ipip_handler __read_mostly = {
+	.handler	=	xfrmi4_rcv_tunnel,
+	.cb_handler	=	xfrmi_rcv_cb,
+	.err_handler	=	xfrmi4_err,
+	.priority	=	-1,
+};
+
 static int __init xfrmi4_init(void)
 {
 	int err;
@@ -853,9 +865,19 @@ static int __init xfrmi4_init(void)
 	err = xfrm4_protocol_register(&xfrmi_ipcomp4_protocol, IPPROTO_COMP);
 	if (err < 0)
 		goto xfrm_proto_comp_failed;
+	err = xfrm4_tunnel_register(&xfrmi_ipip_handler, AF_INET);
+	if (err < 0)
+		goto xfrm_tunnel_ipip_failed;
+	err = xfrm4_tunnel_register(&xfrmi_ipip_handler, AF_INET6);
+	if (err < 0)
+		goto xfrm_tunnel_ipip6_failed;
 
 	return 0;
 
+xfrm_tunnel_ipip6_failed:
+	xfrm4_tunnel_deregister(&xfrmi_ipip_handler, AF_INET);
+xfrm_tunnel_ipip_failed:
+	xfrm4_protocol_deregister(&xfrmi_ipcomp4_protocol, IPPROTO_COMP);
 xfrm_proto_comp_failed:
 	xfrm4_protocol_deregister(&xfrmi_ah4_protocol, IPPROTO_AH);
 xfrm_proto_ah_failed:
@@ -866,6 +888,8 @@ static int __init xfrmi4_init(void)
 
 static void xfrmi4_fini(void)
 {
+	xfrm4_tunnel_deregister(&xfrmi_ipip_handler, AF_INET6);
+	xfrm4_tunnel_deregister(&xfrmi_ipip_handler, AF_INET);
 	xfrm4_protocol_deregister(&xfrmi_ipcomp4_protocol, IPPROTO_COMP);
 	xfrm4_protocol_deregister(&xfrmi_ah4_protocol, IPPROTO_AH);
 	xfrm4_protocol_deregister(&xfrmi_esp4_protocol, IPPROTO_ESP);
-- 
2.1.0