1 // SPDX-License-Identifier: GPL-2.0-only
2 /* xfrm4_tunnel.c: Generic IP tunnel transformer.
4 * Copyright (C) 2003 David S. Miller (davem@redhat.com)
7 #define pr_fmt(fmt) "IPsec: " fmt
9 #include <linux/skbuff.h>
10 #include <linux/module.h>
11 #include <linux/mutex.h>
14 #include <net/protocol.h>
16 static int ipip_output(struct xfrm_state
*x
, struct sk_buff
*skb
)
18 skb_push(skb
, -skb_network_offset(skb
));
22 static int ipip_xfrm_rcv(struct xfrm_state
*x
, struct sk_buff
*skb
)
24 return ip_hdr(skb
)->protocol
;
27 static int ipip_init_state(struct xfrm_state
*x
)
29 if (x
->props
.mode
!= XFRM_MODE_TUNNEL
)
35 x
->props
.header_len
= sizeof(struct iphdr
);
40 static void ipip_destroy(struct xfrm_state
*x
)
44 static const struct xfrm_type ipip_type
= {
46 .proto
= IPPROTO_IPIP
,
47 .init_state
= ipip_init_state
,
48 .destructor
= ipip_destroy
,
49 .input
= ipip_xfrm_rcv
,
53 static int xfrm_tunnel_rcv(struct sk_buff
*skb
)
55 return xfrm4_rcv_spi(skb
, IPPROTO_IPIP
, ip_hdr(skb
)->saddr
);
58 static int xfrm_tunnel_err(struct sk_buff
*skb
, u32 info
)
63 static struct xfrm_tunnel xfrm_tunnel_handler __read_mostly
= {
64 .handler
= xfrm_tunnel_rcv
,
65 .err_handler
= xfrm_tunnel_err
,
69 #if IS_ENABLED(CONFIG_IPV6)
70 static struct xfrm_tunnel xfrm64_tunnel_handler __read_mostly
= {
71 .handler
= xfrm_tunnel_rcv
,
72 .err_handler
= xfrm_tunnel_err
,
77 static int __init
ipip_init(void)
79 if (xfrm_register_type(&ipip_type
, AF_INET
) < 0) {
80 pr_info("%s: can't add xfrm type\n", __func__
);
84 if (xfrm4_tunnel_register(&xfrm_tunnel_handler
, AF_INET
)) {
85 pr_info("%s: can't add xfrm handler for AF_INET\n", __func__
);
86 xfrm_unregister_type(&ipip_type
, AF_INET
);
89 #if IS_ENABLED(CONFIG_IPV6)
90 if (xfrm4_tunnel_register(&xfrm64_tunnel_handler
, AF_INET6
)) {
91 pr_info("%s: can't add xfrm handler for AF_INET6\n", __func__
);
92 xfrm4_tunnel_deregister(&xfrm_tunnel_handler
, AF_INET
);
93 xfrm_unregister_type(&ipip_type
, AF_INET
);
100 static void __exit
ipip_fini(void)
102 #if IS_ENABLED(CONFIG_IPV6)
103 if (xfrm4_tunnel_deregister(&xfrm64_tunnel_handler
, AF_INET6
))
104 pr_info("%s: can't remove xfrm handler for AF_INET6\n",
107 if (xfrm4_tunnel_deregister(&xfrm_tunnel_handler
, AF_INET
))
108 pr_info("%s: can't remove xfrm handler for AF_INET\n",
110 xfrm_unregister_type(&ipip_type
, AF_INET
);
113 module_init(ipip_init
);
114 module_exit(ipip_fini
);
115 MODULE_LICENSE("GPL");
116 MODULE_ALIAS_XFRM_TYPE(AF_INET
, XFRM_PROTO_IPIP
);