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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 | static void xfrm6_beet_make_header(struct sk_buff *skb) |
23 | { |
24 | struct ipv6hdr *iph = ipv6_hdr(skb); |
25 | |
26 | iph->version = 6; |
27 | |
28 | memcpy(iph->flow_lbl, XFRM_MODE_SKB_CB(skb)->flow_lbl, |
29 | sizeof(iph->flow_lbl)); |
30 | iph->nexthdr = XFRM_MODE_SKB_CB(skb)->protocol; |
31 | |
32 | ipv6_change_dsfield(iph, 0, XFRM_MODE_SKB_CB(skb)->tos); |
33 | iph->hop_limit = XFRM_MODE_SKB_CB(skb)->ttl; |
34 | } |
35 | |
36 | /* Add encapsulation header. |
37 | * |
38 | * The top IP header will be constructed per draft-nikander-esp-beet-mode-06.txt. |
39 | */ |
40 | static int xfrm6_beet_output(struct xfrm_state *x, struct sk_buff *skb) |
41 | { |
42 | struct ipv6hdr *top_iph; |
43 | struct ip_beet_phdr *ph; |
44 | struct iphdr *iphv4; |
45 | int optlen, hdr_len; |
46 | |
47 | iphv4 = ip_hdr(skb); |
48 | hdr_len = 0; |
49 | optlen = XFRM_MODE_SKB_CB(skb)->optlen; |
50 | if (unlikely(optlen)) |
51 | hdr_len += IPV4_BEET_PHMAXLEN - (optlen & 4); |
52 | |
53 | skb_set_network_header(skb, -x->props.header_len - hdr_len); |
54 | if (x->sel.family != AF_INET6) |
55 | skb->network_header += IPV4_BEET_PHMAXLEN; |
56 | skb->mac_header = skb->network_header + |
57 | offsetof(struct ipv6hdr, nexthdr); |
58 | skb->transport_header = skb->network_header + sizeof(*top_iph); |
59 | ph = (struct ip_beet_phdr *)__skb_pull(skb, XFRM_MODE_SKB_CB(skb)->ihl-hdr_len); |
60 | |
61 | xfrm6_beet_make_header(skb); |
62 | |
63 | top_iph = ipv6_hdr(skb); |
64 | if (unlikely(optlen)) { |
65 | |
66 | BUG_ON(optlen < 0); |
67 | |
68 | ph->padlen = 4 - (optlen & 4); |
69 | ph->hdrlen = optlen / 8; |
70 | ph->nexthdr = top_iph->nexthdr; |
71 | if (ph->padlen) |
72 | memset(ph + 1, IPOPT_NOP, ph->padlen); |
73 | |
74 | top_iph->nexthdr = IPPROTO_BEETPH; |
75 | } |
76 | |
77 | ipv6_addr_copy(&top_iph->saddr, (struct in6_addr *)&x->props.saddr); |
78 | ipv6_addr_copy(&top_iph->daddr, (struct in6_addr *)&x->id.daddr); |
79 | return 0; |
80 | } |
81 | |
82 | static int xfrm6_beet_input(struct xfrm_state *x, struct sk_buff *skb) |
83 | { |
84 | struct ipv6hdr *ip6h; |
85 | const unsigned char *old_mac; |
86 | int size = sizeof(struct ipv6hdr); |
87 | int err; |
88 | |
89 | err = skb_cow_head(skb, size + skb->mac_len); |
90 | if (err) |
91 | goto out; |
92 | |
93 | __skb_push(skb, size); |
94 | skb_reset_network_header(skb); |
95 | |
96 | old_mac = skb_mac_header(skb); |
97 | skb_set_mac_header(skb, -skb->mac_len); |
98 | memmove(skb_mac_header(skb), old_mac, skb->mac_len); |
99 | |
100 | xfrm6_beet_make_header(skb); |
101 | |
102 | ip6h = ipv6_hdr(skb); |
103 | ip6h->payload_len = htons(skb->len - size); |
104 | ipv6_addr_copy(&ip6h->daddr, (struct in6_addr *) &x->sel.daddr.a6); |
105 | ipv6_addr_copy(&ip6h->saddr, (struct in6_addr *) &x->sel.saddr.a6); |
106 | err = 0; |
107 | out: |
108 | return err; |
109 | } |
110 | |
111 | static struct xfrm_mode xfrm6_beet_mode = { |
112 | .input2 = xfrm6_beet_input, |
113 | .input = xfrm_prepare_input, |
114 | .output2 = xfrm6_beet_output, |
115 | .output = xfrm6_prepare_output, |
116 | .owner = THIS_MODULE, |
117 | .encap = XFRM_MODE_BEET, |
118 | .flags = XFRM_MODE_FLAG_TUNNEL, |
119 | }; |
120 | |
121 | static int __init xfrm6_beet_init(void) |
122 | { |
123 | return xfrm_register_mode(&xfrm6_beet_mode, AF_INET6); |
124 | } |
125 | |
126 | static void __exit xfrm6_beet_exit(void) |
127 | { |
128 | int err; |
129 | |
130 | err = xfrm_unregister_mode(&xfrm6_beet_mode, AF_INET6); |
131 | BUG_ON(err); |
132 | } |
133 | |
134 | module_init(xfrm6_beet_init); |
135 | module_exit(xfrm6_beet_exit); |
136 | MODULE_LICENSE("GPL"); |
137 | MODULE_ALIAS_XFRM_MODE(AF_INET6, XFRM_MODE_BEET); |
138 |
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