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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. | |
0a69452c DB |
25 | */ |
26 | static int xfrm6_beet_output(struct xfrm_state *x, struct sk_buff *skb) | |
27 | { | |
36cf9acf | 28 | struct ipv6hdr *top_iph; |
0a69452c | 29 | |
7b277b1a | 30 | skb_set_network_header(skb, -x->props.header_len); |
36cf9acf HX |
31 | skb->mac_header = skb->network_header + |
32 | offsetof(struct ipv6hdr, nexthdr); | |
33 | skb->transport_header = skb->network_header + sizeof(*top_iph); | |
0660e03f | 34 | top_iph = ipv6_hdr(skb); |
0a69452c | 35 | |
36cf9acf HX |
36 | top_iph->version = 6; |
37 | ||
38 | memcpy(top_iph->flow_lbl, XFRM_MODE_SKB_CB(skb)->flow_lbl, | |
39 | sizeof(top_iph->flow_lbl)); | |
40 | top_iph->nexthdr = XFRM_MODE_SKB_CB(skb)->protocol; | |
41 | ||
42 | ipv6_change_dsfield(top_iph, 0, XFRM_MODE_SKB_CB(skb)->tos); | |
43 | top_iph->hop_limit = XFRM_MODE_SKB_CB(skb)->ttl; | |
0a69452c DB |
44 | ipv6_addr_copy(&top_iph->saddr, (struct in6_addr *)&x->props.saddr); |
45 | ipv6_addr_copy(&top_iph->daddr, (struct in6_addr *)&x->id.daddr); | |
0a69452c DB |
46 | return 0; |
47 | } | |
48 | ||
49 | static int xfrm6_beet_input(struct xfrm_state *x, struct sk_buff *skb) | |
50 | { | |
51 | struct ipv6hdr *ip6h; | |
39f69c6f | 52 | const unsigned char *old_mac; |
0a69452c DB |
53 | int size = sizeof(struct ipv6hdr); |
54 | int err = -EINVAL; | |
55 | ||
56 | if (!pskb_may_pull(skb, sizeof(struct ipv6hdr))) | |
57 | goto out; | |
58 | ||
59 | skb_push(skb, size); | |
d56f90a7 | 60 | memmove(skb->data, skb_network_header(skb), size); |
c1d2bbe1 | 61 | skb_reset_network_header(skb); |
0a69452c | 62 | |
98e399f8 | 63 | old_mac = skb_mac_header(skb); |
39f69c6f | 64 | skb_set_mac_header(skb, -skb->mac_len); |
98e399f8 | 65 | memmove(skb_mac_header(skb), old_mac, skb->mac_len); |
0a69452c | 66 | |
0660e03f | 67 | ip6h = ipv6_hdr(skb); |
0a69452c DB |
68 | ip6h->payload_len = htons(skb->len - size); |
69 | ipv6_addr_copy(&ip6h->daddr, (struct in6_addr *) &x->sel.daddr.a6); | |
70 | ipv6_addr_copy(&ip6h->saddr, (struct in6_addr *) &x->sel.saddr.a6); | |
71 | err = 0; | |
72 | out: | |
73 | return err; | |
74 | } | |
75 | ||
76 | static struct xfrm_mode xfrm6_beet_mode = { | |
77 | .input = xfrm6_beet_input, | |
36cf9acf HX |
78 | .output2 = xfrm6_beet_output, |
79 | .output = xfrm6_prepare_output, | |
0a69452c DB |
80 | .owner = THIS_MODULE, |
81 | .encap = XFRM_MODE_BEET, | |
1bfcb10f | 82 | .flags = XFRM_MODE_FLAG_TUNNEL, |
0a69452c DB |
83 | }; |
84 | ||
85 | static int __init xfrm6_beet_init(void) | |
86 | { | |
87 | return xfrm_register_mode(&xfrm6_beet_mode, AF_INET6); | |
88 | } | |
89 | ||
90 | static void __exit xfrm6_beet_exit(void) | |
91 | { | |
92 | int err; | |
93 | ||
94 | err = xfrm_unregister_mode(&xfrm6_beet_mode, AF_INET6); | |
95 | BUG_ON(err); | |
96 | } | |
97 | ||
98 | module_init(xfrm6_beet_init); | |
99 | module_exit(xfrm6_beet_exit); | |
100 | MODULE_LICENSE("GPL"); | |
101 | MODULE_ALIAS_XFRM_MODE(AF_INET6, XFRM_MODE_BEET); |