projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 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 | ||
| 227620e2 HX |
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 | ||
| 0a69452c DB |
36 | /* Add encapsulation header. |
| 37 | * | |
| 38 | * The top IP header will be constructed per draft-nikander-esp-beet-mode-06.txt. | |
| 0a69452c DB |
39 | */ |
| 40 | static int xfrm6_beet_output(struct xfrm_state *x, struct sk_buff *skb) | |
| 41 | { | |
| 36cf9acf | 42 | struct ipv6hdr *top_iph; |
| abf5cdb8 | 43 | struct ip_beet_phdr *ph; |
| abf5cdb8 | 44 | int optlen, hdr_len; |
| 0a69452c | 45 | |
| abf5cdb8 JK |
46 | hdr_len = 0; |
| 47 | optlen = XFRM_MODE_SKB_CB(skb)->optlen; | |
| 48 | if (unlikely(optlen)) | |
| 49 | hdr_len += IPV4_BEET_PHMAXLEN - (optlen & 4); | |
| 50 | ||
| 51 | skb_set_network_header(skb, -x->props.header_len - hdr_len); | |
| 52 | if (x->sel.family != AF_INET6) | |
| 53 | skb->network_header += IPV4_BEET_PHMAXLEN; | |
| 36cf9acf HX |
54 | skb->mac_header = skb->network_header + |
| 55 | offsetof(struct ipv6hdr, nexthdr); | |
| 56 | skb->transport_header = skb->network_header + sizeof(*top_iph); | |
| abf5cdb8 | 57 | ph = (struct ip_beet_phdr *)__skb_pull(skb, XFRM_MODE_SKB_CB(skb)->ihl-hdr_len); |
| 0a69452c | 58 | |
| 227620e2 | 59 | xfrm6_beet_make_header(skb); |
| 36cf9acf | 60 | |
| 227620e2 | 61 | top_iph = ipv6_hdr(skb); |
| abf5cdb8 JK |
62 | if (unlikely(optlen)) { |
| 63 | ||
| 64 | BUG_ON(optlen < 0); | |
| 65 | ||
| 66 | ph->padlen = 4 - (optlen & 4); | |
| 67 | ph->hdrlen = optlen / 8; | |
| 68 | ph->nexthdr = top_iph->nexthdr; | |
| 69 | if (ph->padlen) | |
| 70 | memset(ph + 1, IPOPT_NOP, ph->padlen); | |
| 71 | ||
| 72 | top_iph->nexthdr = IPPROTO_BEETPH; | |
| 73 | } | |
| 36cf9acf | 74 | |
| 4e3fd7a0 AD |
75 | top_iph->saddr = *(struct in6_addr *)&x->props.saddr; |
| 76 | top_iph->daddr = *(struct in6_addr *)&x->id.daddr; | |
| 0a69452c DB |
77 | return 0; |
| 78 | } | |
| 79 | ||
| 80 | static int xfrm6_beet_input(struct xfrm_state *x, struct sk_buff *skb) | |
| 81 | { | |
| 82 | struct ipv6hdr *ip6h; | |
| 83 | int size = sizeof(struct ipv6hdr); | |
| 227620e2 | 84 | int err; |
| 0a69452c | 85 | |
| 227620e2 HX |
86 | err = skb_cow_head(skb, size + skb->mac_len); |
| 87 | if (err) | |
| 0a69452c DB |
88 | goto out; |
| 89 | ||
| 227620e2 | 90 | __skb_push(skb, size); |
| c1d2bbe1 | 91 | skb_reset_network_header(skb); |
| 03606895 | 92 | skb_mac_header_rebuild(skb); |
| 0a69452c | 93 | |
| 227620e2 HX |
94 | xfrm6_beet_make_header(skb); |
| 95 | ||
| 0660e03f | 96 | ip6h = ipv6_hdr(skb); |
| 0a69452c | 97 | ip6h->payload_len = htons(skb->len - size); |
| 15e318bd JB |
98 | ip6h->daddr = x->sel.daddr.in6; |
| 99 | ip6h->saddr = x->sel.saddr.in6; | |
| 0a69452c DB |
100 | err = 0; |
| 101 | out: | |
| 102 | return err; | |
| 103 | } | |
| 104 | ||
| 105 | static struct xfrm_mode xfrm6_beet_mode = { | |
| 227620e2 HX |
106 | .input2 = xfrm6_beet_input, |
| 107 | .input = xfrm_prepare_input, | |
| 36cf9acf HX |
108 | .output2 = xfrm6_beet_output, |
| 109 | .output = xfrm6_prepare_output, | |
| 0a69452c DB |
110 | .owner = THIS_MODULE, |
| 111 | .encap = XFRM_MODE_BEET, | |
| 1bfcb10f | 112 | .flags = XFRM_MODE_FLAG_TUNNEL, |
| 0a69452c DB |
113 | }; |
| 114 | ||
| 115 | static int __init xfrm6_beet_init(void) | |
| 116 | { | |
| 117 | return xfrm_register_mode(&xfrm6_beet_mode, AF_INET6); | |
| 118 | } | |
| 119 | ||
| 120 | static void __exit xfrm6_beet_exit(void) | |
| 121 | { | |
| 122 | int err; | |
| 123 | ||
| 124 | err = xfrm_unregister_mode(&xfrm6_beet_mode, AF_INET6); | |
| 125 | BUG_ON(err); | |
| 126 | } | |
| 127 | ||
| 128 | module_init(xfrm6_beet_init); | |
| 129 | module_exit(xfrm6_beet_exit); | |
| 130 | MODULE_LICENSE("GPL"); | |
| 131 | MODULE_ALIAS_XFRM_MODE(AF_INET6, XFRM_MODE_BEET); |