Merge master.kernel.org:/pub/scm/linux/kernel/git/davem/sparc-2.6
[linux/fpc-iii.git] / net / ipv6 / xfrm6_mode_beet.c
blobedcfffa9e87b1395723cbf5e07df05ed3bca43ee
1 /*
2 * xfrm6_mode_beet.c - BEET mode encapsulation for IPv6.
4 * Copyright (c) 2006 Diego Beltrami <diego.beltrami@gmail.com>
5 * Miika Komu <miika@iki.fi>
6 * Herbert Xu <herbert@gondor.apana.org.au>
7 * Abhinav Pathak <abhinav.pathak@hiit.fi>
8 * Jeff Ahrenholz <ahrenholz@gmail.com>
9 */
11 #include <linux/init.h>
12 #include <linux/kernel.h>
13 #include <linux/module.h>
14 #include <linux/skbuff.h>
15 #include <linux/stringify.h>
16 #include <net/dsfield.h>
17 #include <net/dst.h>
18 #include <net/inet_ecn.h>
19 #include <net/ipv6.h>
20 #include <net/xfrm.h>
22 /* Add encapsulation header.
24 * The top IP header will be constructed per draft-nikander-esp-beet-mode-06.txt.
25 * The following fields in it shall be filled in by x->type->output:
26 * payload_len
28 * On exit, skb->h will be set to the start of the encapsulation header to be
29 * filled in by x->type->output and skb->nh will be set to the nextheader field
30 * of the extension header directly preceding the encapsulation header, or in
31 * its absence, that of the top IP header. The value of skb->data will always
32 * point to the top IP header.
34 static int xfrm6_beet_output(struct xfrm_state *x, struct sk_buff *skb)
36 struct ipv6hdr *iph, *top_iph;
37 u8 *prevhdr;
38 int hdr_len;
40 skb_push(skb, x->props.header_len);
41 iph = skb->nh.ipv6h;
43 hdr_len = ip6_find_1stfragopt(skb, &prevhdr);
44 skb->nh.raw = prevhdr - x->props.header_len;
45 skb->h.raw = skb->data + hdr_len;
46 memmove(skb->data, iph, hdr_len);
48 skb->nh.raw = skb->data;
49 top_iph = skb->nh.ipv6h;
50 skb->nh.raw = &top_iph->nexthdr;
51 skb->h.ipv6h = top_iph + 1;
53 ipv6_addr_copy(&top_iph->saddr, (struct in6_addr *)&x->props.saddr);
54 ipv6_addr_copy(&top_iph->daddr, (struct in6_addr *)&x->id.daddr);
56 return 0;
59 static int xfrm6_beet_input(struct xfrm_state *x, struct sk_buff *skb)
61 struct ipv6hdr *ip6h;
62 int size = sizeof(struct ipv6hdr);
63 int err = -EINVAL;
65 if (!pskb_may_pull(skb, sizeof(struct ipv6hdr)))
66 goto out;
68 skb_push(skb, size);
69 memmove(skb->data, skb->nh.raw, size);
70 skb->nh.raw = skb->data;
72 skb->mac.raw = memmove(skb->data - skb->mac_len,
73 skb->mac.raw, skb->mac_len);
75 ip6h = skb->nh.ipv6h;
76 ip6h->payload_len = htons(skb->len - size);
77 ipv6_addr_copy(&ip6h->daddr, (struct in6_addr *) &x->sel.daddr.a6);
78 ipv6_addr_copy(&ip6h->saddr, (struct in6_addr *) &x->sel.saddr.a6);
79 err = 0;
80 out:
81 return err;
84 static struct xfrm_mode xfrm6_beet_mode = {
85 .input = xfrm6_beet_input,
86 .output = xfrm6_beet_output,
87 .owner = THIS_MODULE,
88 .encap = XFRM_MODE_BEET,
91 static int __init xfrm6_beet_init(void)
93 return xfrm_register_mode(&xfrm6_beet_mode, AF_INET6);
96 static void __exit xfrm6_beet_exit(void)
98 int err;
100 err = xfrm_unregister_mode(&xfrm6_beet_mode, AF_INET6);
101 BUG_ON(err);
104 module_init(xfrm6_beet_init);
105 module_exit(xfrm6_beet_exit);
106 MODULE_LICENSE("GPL");
107 MODULE_ALIAS_XFRM_MODE(AF_INET6, XFRM_MODE_BEET);