1 /* xfrm4_tunnel.c: Generic IP tunnel transformer. 2 * 3 * Copyright (C) 2003 David S. Miller (davem@redhat.com) 4 */ 5 6 #include <linux/skbuff.h> 7 #include <linux/module.h> 8 #include <linux/mutex.h> 9 #include <net/xfrm.h> 10 #include <net/ip.h> 11 #include <net/protocol.h> 12 13 static int ipip_output(struct xfrm_state *x, struct sk_buff *skb) 14 { 15 skb_push(skb, -skb_network_offset(skb)); 16 return 0; 17 } 18 19 static int ipip_xfrm_rcv(struct xfrm_state *x, struct sk_buff *skb) 20 { 21 return IPPROTO_IP; 22 } 23 24 static int ipip_init_state(struct xfrm_state *x) 25 { 26 if (x->props.mode != XFRM_MODE_TUNNEL) 27 return -EINVAL; 28 29 if (x->encap) 30 return -EINVAL; 31 32 x->props.header_len = sizeof(struct iphdr); 33 34 return 0; 35 } 36 37 static void ipip_destroy(struct xfrm_state *x) 38 { 39 } 40 41 static struct xfrm_type ipip_type = { 42 .description = "IPIP", 43 .owner = THIS_MODULE, 44 .proto = IPPROTO_IPIP, 45 .init_state = ipip_init_state, 46 .destructor = ipip_destroy, 47 .input = ipip_xfrm_rcv, 48 .output = ipip_output 49 }; 50 51 static int xfrm_tunnel_err(struct sk_buff *skb, u32 info) 52 { 53 return -ENOENT; 54 } 55 56 static struct xfrm_tunnel xfrm_tunnel_handler = { 57 .handler = xfrm4_rcv, 58 .err_handler = xfrm_tunnel_err, 59 .priority = 2, 60 }; 61 62 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 63 static struct xfrm_tunnel xfrm64_tunnel_handler = { 64 .handler = xfrm4_rcv, 65 .err_handler = xfrm_tunnel_err, 66 .priority = 2, 67 }; 68 #endif 69 70 static int __init ipip_init(void) 71 { 72 if (xfrm_register_type(&ipip_type, AF_INET) < 0) { 73 printk(KERN_INFO "ipip init: can't add xfrm type\n"); 74 return -EAGAIN; 75 } 76 77 if (xfrm4_tunnel_register(&xfrm_tunnel_handler, AF_INET)) { 78 printk(KERN_INFO "ipip init: can't add xfrm handler for AF_INET\n"); 79 xfrm_unregister_type(&ipip_type, AF_INET); 80 return -EAGAIN; 81 } 82 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 83 if (xfrm4_tunnel_register(&xfrm64_tunnel_handler, AF_INET6)) { 84 printk(KERN_INFO "ipip init: can't add xfrm handler for AF_INET6\n"); 85 xfrm4_tunnel_deregister(&xfrm_tunnel_handler, AF_INET); 86 xfrm_unregister_type(&ipip_type, AF_INET); 87 return -EAGAIN; 88 } 89 #endif 90 return 0; 91 } 92 93 static void __exit ipip_fini(void) 94 { 95 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 96 if (xfrm4_tunnel_deregister(&xfrm64_tunnel_handler, AF_INET6)) 97 printk(KERN_INFO "ipip close: can't remove xfrm handler for AF_INET6\n"); 98 #endif 99 if (xfrm4_tunnel_deregister(&xfrm_tunnel_handler, AF_INET)) 100 printk(KERN_INFO "ipip close: can't remove xfrm handler for AF_INET\n"); 101 if (xfrm_unregister_type(&ipip_type, AF_INET) < 0) 102 printk(KERN_INFO "ipip close: can't remove xfrm type\n"); 103 } 104 105 module_init(ipip_init); 106 module_exit(ipip_fini); 107 MODULE_LICENSE("GPL"); 108 MODULE_ALIAS_XFRM_TYPE(AF_INET, XFRM_PROTO_IPIP); 109