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 { 151da177e4SLinus Torvalds struct iphdr *iph; 161da177e4SLinus Torvalds 171da177e4SLinus Torvalds iph = skb->nh.iph; 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 671da177e4SLinus Torvalds static int __init ipip_init(void) 681da177e4SLinus Torvalds { 691da177e4SLinus Torvalds if (xfrm_register_type(&ipip_type, AF_INET) < 0) { 701da177e4SLinus Torvalds printk(KERN_INFO "ipip init: can't add xfrm type\n"); 711da177e4SLinus Torvalds return -EAGAIN; 721da177e4SLinus Torvalds } 73d2acc347SHerbert Xu if (xfrm4_tunnel_register(&xfrm_tunnel_handler)) { 74d2acc347SHerbert Xu printk(KERN_INFO "ipip init: can't add xfrm handler\n"); 751da177e4SLinus Torvalds xfrm_unregister_type(&ipip_type, AF_INET); 761da177e4SLinus Torvalds return -EAGAIN; 771da177e4SLinus Torvalds } 781da177e4SLinus Torvalds return 0; 791da177e4SLinus Torvalds } 801da177e4SLinus Torvalds 811da177e4SLinus Torvalds static void __exit ipip_fini(void) 821da177e4SLinus Torvalds { 83d2acc347SHerbert Xu if (xfrm4_tunnel_deregister(&xfrm_tunnel_handler)) 84d2acc347SHerbert Xu printk(KERN_INFO "ipip close: can't remove xfrm handler\n"); 851da177e4SLinus Torvalds if (xfrm_unregister_type(&ipip_type, AF_INET) < 0) 861da177e4SLinus Torvalds printk(KERN_INFO "ipip close: can't remove xfrm type\n"); 871da177e4SLinus Torvalds } 881da177e4SLinus Torvalds 891da177e4SLinus Torvalds module_init(ipip_init); 901da177e4SLinus Torvalds module_exit(ipip_fini); 911da177e4SLinus Torvalds MODULE_LICENSE("GPL"); 92