// SPDX-License-Identifier: GPL-2.0-only
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/* xfrm4_tunnel.c: Generic IP tunnel transformer.
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*
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* Copyright (C) 2003 David S. Miller (davem@redhat.com)
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*/
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#define pr_fmt(fmt) "IPsec: " fmt
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#include <linux/skbuff.h>
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#include <linux/module.h>
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#include <linux/mutex.h>
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#include <net/xfrm.h>
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#include <net/ip.h>
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#include <net/protocol.h>
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static int ipip_output(struct xfrm_state *x, struct sk_buff *skb)
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{
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skb_push(skb, -skb_network_offset(skb));
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return 0;
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}
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static int ipip_xfrm_rcv(struct xfrm_state *x, struct sk_buff *skb)
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{
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return ip_hdr(skb)->protocol;
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}
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static int ipip_init_state(struct xfrm_state *x)
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{
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if (x->props.mode != XFRM_MODE_TUNNEL)
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return -EINVAL;
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if (x->encap)
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return -EINVAL;
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x->props.header_len = sizeof(struct iphdr);
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return 0;
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}
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static void ipip_destroy(struct xfrm_state *x)
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{
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}
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static const struct xfrm_type ipip_type = {
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.description = "IPIP",
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.owner = THIS_MODULE,
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.proto = IPPROTO_IPIP,
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.init_state = ipip_init_state,
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.destructor = ipip_destroy,
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.input = ipip_xfrm_rcv,
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.output = ipip_output
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};
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static int xfrm_tunnel_rcv(struct sk_buff *skb)
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{
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return xfrm4_rcv_spi(skb, IPPROTO_IPIP, ip_hdr(skb)->saddr);
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}
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static int xfrm_tunnel_err(struct sk_buff *skb, u32 info)
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{
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return -ENOENT;
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}
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static struct xfrm_tunnel xfrm_tunnel_handler __read_mostly = {
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.handler = xfrm_tunnel_rcv,
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.err_handler = xfrm_tunnel_err,
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.priority = 4,
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};
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#if IS_ENABLED(CONFIG_IPV6)
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static struct xfrm_tunnel xfrm64_tunnel_handler __read_mostly = {
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.handler = xfrm_tunnel_rcv,
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.err_handler = xfrm_tunnel_err,
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.priority = 3,
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};
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#endif
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static int __init ipip_init(void)
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{
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if (xfrm_register_type(&ipip_type, AF_INET) < 0) {
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pr_info("%s: can't add xfrm type\n", __func__);
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return -EAGAIN;
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}
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if (xfrm4_tunnel_register(&xfrm_tunnel_handler, AF_INET)) {
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pr_info("%s: can't add xfrm handler for AF_INET\n", __func__);
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xfrm_unregister_type(&ipip_type, AF_INET);
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return -EAGAIN;
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}
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#if IS_ENABLED(CONFIG_IPV6)
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if (xfrm4_tunnel_register(&xfrm64_tunnel_handler, AF_INET6)) {
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pr_info("%s: can't add xfrm handler for AF_INET6\n", __func__);
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xfrm4_tunnel_deregister(&xfrm_tunnel_handler, AF_INET);
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xfrm_unregister_type(&ipip_type, AF_INET);
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return -EAGAIN;
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}
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#endif
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return 0;
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}
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static void __exit ipip_fini(void)
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{
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#if IS_ENABLED(CONFIG_IPV6)
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if (xfrm4_tunnel_deregister(&xfrm64_tunnel_handler, AF_INET6))
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pr_info("%s: can't remove xfrm handler for AF_INET6\n",
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__func__);
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#endif
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if (xfrm4_tunnel_deregister(&xfrm_tunnel_handler, AF_INET))
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pr_info("%s: can't remove xfrm handler for AF_INET\n",
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__func__);
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xfrm_unregister_type(&ipip_type, AF_INET);
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}
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module_init(ipip_init);
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module_exit(ipip_fini);
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MODULE_LICENSE("GPL");
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MODULE_ALIAS_XFRM_TYPE(AF_INET, XFRM_PROTO_IPIP);
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