11da177e4SLinus Torvalds /* xfrm4_tunnel.c: Generic IP tunnel transformer. 21da177e4SLinus Torvalds * 31da177e4SLinus Torvalds * Copyright (C) 2003 David S. Miller (davem@redhat.com) 41da177e4SLinus Torvalds */ 51da177e4SLinus Torvalds 61da177e4SLinus Torvalds #include <linux/skbuff.h> 71da177e4SLinus Torvalds #include <linux/module.h> 84a3e2f71SArjan van de Ven #include <linux/mutex.h> 91da177e4SLinus Torvalds #include <net/xfrm.h> 101da177e4SLinus Torvalds #include <net/ip.h> 111da177e4SLinus Torvalds #include <net/protocol.h> 121da177e4SLinus Torvalds 131da177e4SLinus Torvalds static int ipip_output(struct xfrm_state *x, struct sk_buff *skb) 141da177e4SLinus Torvalds { 15eddc9ec5SArnaldo Carvalho de Melo struct iphdr *iph = ip_hdr(skb); 161da177e4SLinus Torvalds 177b277b1aSHerbert Xu skb_push(skb, -skb_network_offset(skb)); 181da177e4SLinus Torvalds iph->tot_len = htons(skb->len); 191da177e4SLinus Torvalds ip_send_check(iph); 201da177e4SLinus Torvalds 211da177e4SLinus Torvalds return 0; 221da177e4SLinus Torvalds } 231da177e4SLinus Torvalds 24e695633eSHerbert Xu static int ipip_xfrm_rcv(struct xfrm_state *x, struct sk_buff *skb) 251da177e4SLinus Torvalds { 261da177e4SLinus Torvalds return 0; 271da177e4SLinus Torvalds } 281da177e4SLinus Torvalds 2972cb6962SHerbert Xu static int ipip_init_state(struct xfrm_state *x) 301da177e4SLinus Torvalds { 317e49e6deSMasahide NAKAMURA if (x->props.mode != XFRM_MODE_TUNNEL) 321da177e4SLinus Torvalds return -EINVAL; 331da177e4SLinus Torvalds 341da177e4SLinus Torvalds if (x->encap) 351da177e4SLinus Torvalds return -EINVAL; 361da177e4SLinus Torvalds 371da177e4SLinus Torvalds x->props.header_len = sizeof(struct iphdr); 381da177e4SLinus Torvalds 391da177e4SLinus Torvalds return 0; 401da177e4SLinus Torvalds } 411da177e4SLinus Torvalds 421da177e4SLinus Torvalds static void ipip_destroy(struct xfrm_state *x) 431da177e4SLinus Torvalds { 441da177e4SLinus Torvalds } 451da177e4SLinus Torvalds 461da177e4SLinus Torvalds static struct xfrm_type ipip_type = { 471da177e4SLinus Torvalds .description = "IPIP", 481da177e4SLinus Torvalds .owner = THIS_MODULE, 491da177e4SLinus Torvalds .proto = IPPROTO_IPIP, 501da177e4SLinus Torvalds .init_state = ipip_init_state, 511da177e4SLinus Torvalds .destructor = ipip_destroy, 521da177e4SLinus Torvalds .input = ipip_xfrm_rcv, 531da177e4SLinus Torvalds .output = ipip_output 541da177e4SLinus Torvalds }; 551da177e4SLinus Torvalds 56d2acc347SHerbert Xu static int xfrm_tunnel_err(struct sk_buff *skb, u32 info) 57d2acc347SHerbert Xu { 58d2acc347SHerbert Xu return -ENOENT; 59d2acc347SHerbert Xu } 60d2acc347SHerbert Xu 61d2acc347SHerbert Xu static struct xfrm_tunnel xfrm_tunnel_handler = { 62d2acc347SHerbert Xu .handler = xfrm4_rcv, 63d2acc347SHerbert Xu .err_handler = xfrm_tunnel_err, 64d2acc347SHerbert Xu .priority = 2, 651da177e4SLinus Torvalds }; 661da177e4SLinus Torvalds 67c0d56408SKazunori MIYAZAWA #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 68c0d56408SKazunori MIYAZAWA static struct xfrm_tunnel xfrm64_tunnel_handler = { 69c0d56408SKazunori MIYAZAWA .handler = xfrm4_rcv, 70c0d56408SKazunori MIYAZAWA .err_handler = xfrm_tunnel_err, 71c0d56408SKazunori MIYAZAWA .priority = 2, 72c0d56408SKazunori MIYAZAWA }; 73c0d56408SKazunori MIYAZAWA #endif 74c0d56408SKazunori MIYAZAWA 751da177e4SLinus Torvalds static int __init ipip_init(void) 761da177e4SLinus Torvalds { 771da177e4SLinus Torvalds if (xfrm_register_type(&ipip_type, AF_INET) < 0) { 781da177e4SLinus Torvalds printk(KERN_INFO "ipip init: can't add xfrm type\n"); 791da177e4SLinus Torvalds return -EAGAIN; 801da177e4SLinus Torvalds } 81c0d56408SKazunori MIYAZAWA 82c0d56408SKazunori MIYAZAWA if (xfrm4_tunnel_register(&xfrm_tunnel_handler, AF_INET)) { 83c0d56408SKazunori MIYAZAWA printk(KERN_INFO "ipip init: can't add xfrm handler for AF_INET\n"); 841da177e4SLinus Torvalds xfrm_unregister_type(&ipip_type, AF_INET); 851da177e4SLinus Torvalds return -EAGAIN; 861da177e4SLinus Torvalds } 87c0d56408SKazunori MIYAZAWA #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 88c0d56408SKazunori MIYAZAWA if (xfrm4_tunnel_register(&xfrm64_tunnel_handler, AF_INET6)) { 89c0d56408SKazunori MIYAZAWA printk(KERN_INFO "ipip init: can't add xfrm handler for AF_INET6\n"); 90c0d56408SKazunori MIYAZAWA xfrm4_tunnel_deregister(&xfrm_tunnel_handler, AF_INET); 91c0d56408SKazunori MIYAZAWA xfrm_unregister_type(&ipip_type, AF_INET); 92c0d56408SKazunori MIYAZAWA return -EAGAIN; 93c0d56408SKazunori MIYAZAWA } 94c0d56408SKazunori MIYAZAWA #endif 951da177e4SLinus Torvalds return 0; 961da177e4SLinus Torvalds } 971da177e4SLinus Torvalds 981da177e4SLinus Torvalds static void __exit ipip_fini(void) 991da177e4SLinus Torvalds { 100c0d56408SKazunori MIYAZAWA #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 101c0d56408SKazunori MIYAZAWA if (xfrm4_tunnel_deregister(&xfrm64_tunnel_handler, AF_INET6)) 102c0d56408SKazunori MIYAZAWA printk(KERN_INFO "ipip close: can't remove xfrm handler for AF_INET6\n"); 103c0d56408SKazunori MIYAZAWA #endif 104c0d56408SKazunori MIYAZAWA if (xfrm4_tunnel_deregister(&xfrm_tunnel_handler, AF_INET)) 105c0d56408SKazunori MIYAZAWA printk(KERN_INFO "ipip close: can't remove xfrm handler for AF_INET\n"); 1061da177e4SLinus Torvalds if (xfrm_unregister_type(&ipip_type, AF_INET) < 0) 1071da177e4SLinus Torvalds printk(KERN_INFO "ipip close: can't remove xfrm type\n"); 1081da177e4SLinus Torvalds } 1091da177e4SLinus Torvalds 1101da177e4SLinus Torvalds module_init(ipip_init); 1111da177e4SLinus Torvalds module_exit(ipip_fini); 1121da177e4SLinus Torvalds MODULE_LICENSE("GPL"); 113d3d6dd3aSMasahide NAKAMURA MODULE_ALIAS_XFRM_TYPE(AF_INET, XFRM_PROTO_IPIP); 114