631a6698d0
This patch makes the IPv4 x->type->input functions return the next protocol instead of setting it directly. This is identical to how we do things in IPv6 and will help us merge common code on the input path. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au> Signed-off-by: David S. Miller <davem@davemloft.net>
109 lines
2.6 KiB
C
109 lines
2.6 KiB
C
/* 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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#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 IPPROTO_IP;
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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 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_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 = {
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.handler = xfrm4_rcv,
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.err_handler = xfrm_tunnel_err,
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.priority = 2,
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};
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#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
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static struct xfrm_tunnel xfrm64_tunnel_handler = {
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.handler = xfrm4_rcv,
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.err_handler = xfrm_tunnel_err,
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.priority = 2,
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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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printk(KERN_INFO "ipip init: can't add xfrm type\n");
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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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printk(KERN_INFO "ipip init: can't add xfrm handler for AF_INET\n");
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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 defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
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if (xfrm4_tunnel_register(&xfrm64_tunnel_handler, AF_INET6)) {
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printk(KERN_INFO "ipip init: can't add xfrm handler for AF_INET6\n");
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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 defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
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if (xfrm4_tunnel_deregister(&xfrm64_tunnel_handler, AF_INET6))
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printk(KERN_INFO "ipip close: can't remove xfrm handler for AF_INET6\n");
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#endif
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if (xfrm4_tunnel_deregister(&xfrm_tunnel_handler, AF_INET))
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printk(KERN_INFO "ipip close: can't remove xfrm handler for AF_INET\n");
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if (xfrm_unregister_type(&ipip_type, AF_INET) < 0)
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printk(KERN_INFO "ipip close: can't remove xfrm type\n");
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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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