Commit | Line | Data |
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0a69452c DB |
1 | /* |
2 | * xfrm6_mode_beet.c - BEET mode encapsulation for IPv6. | |
3 | * | |
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 | */ | |
10 | ||
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> | |
21 | ||
22 | /* Add encapsulation header. | |
23 | * | |
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 | |
0a69452c DB |
27 | */ |
28 | static int xfrm6_beet_output(struct xfrm_state *x, struct sk_buff *skb) | |
29 | { | |
30 | struct ipv6hdr *iph, *top_iph; | |
31 | u8 *prevhdr; | |
32 | int hdr_len; | |
33 | ||
0660e03f | 34 | iph = ipv6_hdr(skb); |
0a69452c DB |
35 | |
36 | hdr_len = ip6_find_1stfragopt(skb, &prevhdr); | |
0a69452c | 37 | |
bee0b40c | 38 | skb_set_mac_header(skb, (prevhdr - x->props.header_len) - skb->data); |
7b277b1a | 39 | skb_set_network_header(skb, -x->props.header_len); |
37fedd3a | 40 | skb->transport_header = skb->network_header + hdr_len; |
7b277b1a HX |
41 | __skb_pull(skb, hdr_len); |
42 | ||
0660e03f | 43 | top_iph = ipv6_hdr(skb); |
7b277b1a | 44 | memmove(top_iph, iph, hdr_len); |
0a69452c DB |
45 | |
46 | ipv6_addr_copy(&top_iph->saddr, (struct in6_addr *)&x->props.saddr); | |
47 | ipv6_addr_copy(&top_iph->daddr, (struct in6_addr *)&x->id.daddr); | |
48 | ||
49 | return 0; | |
50 | } | |
51 | ||
52 | static int xfrm6_beet_input(struct xfrm_state *x, struct sk_buff *skb) | |
53 | { | |
54 | struct ipv6hdr *ip6h; | |
39f69c6f | 55 | const unsigned char *old_mac; |
0a69452c DB |
56 | int size = sizeof(struct ipv6hdr); |
57 | int err = -EINVAL; | |
58 | ||
59 | if (!pskb_may_pull(skb, sizeof(struct ipv6hdr))) | |
60 | goto out; | |
61 | ||
62 | skb_push(skb, size); | |
d56f90a7 | 63 | memmove(skb->data, skb_network_header(skb), size); |
c1d2bbe1 | 64 | skb_reset_network_header(skb); |
0a69452c | 65 | |
98e399f8 | 66 | old_mac = skb_mac_header(skb); |
39f69c6f | 67 | skb_set_mac_header(skb, -skb->mac_len); |
98e399f8 | 68 | memmove(skb_mac_header(skb), old_mac, skb->mac_len); |
0a69452c | 69 | |
0660e03f | 70 | ip6h = ipv6_hdr(skb); |
0a69452c DB |
71 | ip6h->payload_len = htons(skb->len - size); |
72 | ipv6_addr_copy(&ip6h->daddr, (struct in6_addr *) &x->sel.daddr.a6); | |
73 | ipv6_addr_copy(&ip6h->saddr, (struct in6_addr *) &x->sel.saddr.a6); | |
74 | err = 0; | |
75 | out: | |
76 | return err; | |
77 | } | |
78 | ||
79 | static struct xfrm_mode xfrm6_beet_mode = { | |
80 | .input = xfrm6_beet_input, | |
81 | .output = xfrm6_beet_output, | |
82 | .owner = THIS_MODULE, | |
83 | .encap = XFRM_MODE_BEET, | |
84 | }; | |
85 | ||
86 | static int __init xfrm6_beet_init(void) | |
87 | { | |
88 | return xfrm_register_mode(&xfrm6_beet_mode, AF_INET6); | |
89 | } | |
90 | ||
91 | static void __exit xfrm6_beet_exit(void) | |
92 | { | |
93 | int err; | |
94 | ||
95 | err = xfrm_unregister_mode(&xfrm6_beet_mode, AF_INET6); | |
96 | BUG_ON(err); | |
97 | } | |
98 | ||
99 | module_init(xfrm6_beet_init); | |
100 | module_exit(xfrm6_beet_exit); | |
101 | MODULE_LICENSE("GPL"); | |
102 | MODULE_ALIAS_XFRM_MODE(AF_INET6, XFRM_MODE_BEET); |