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Linux/net/ipv6/xfrm6_mode_beet.c

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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         int optlen, hdr_len;
 45 
 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;
 54         skb->mac_header = skb->network_header +
 55                           offsetof(struct ipv6hdr, nexthdr);
 56         skb->transport_header = skb->network_header + sizeof(*top_iph);
 57         ph = (struct ip_beet_phdr *)__skb_pull(skb, XFRM_MODE_SKB_CB(skb)->ihl-hdr_len);
 58 
 59         xfrm6_beet_make_header(skb);
 60 
 61         top_iph = ipv6_hdr(skb);
 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         }
 74 
 75         top_iph->saddr = *(struct in6_addr *)&x->props.saddr;
 76         top_iph->daddr = *(struct in6_addr *)&x->id.daddr;
 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);
 84         int err;
 85 
 86         err = skb_cow_head(skb, size + skb->mac_len);
 87         if (err)
 88                 goto out;
 89 
 90         __skb_push(skb, size);
 91         skb_reset_network_header(skb);
 92         skb_mac_header_rebuild(skb);
 93 
 94         xfrm6_beet_make_header(skb);
 95 
 96         ip6h = ipv6_hdr(skb);
 97         ip6h->payload_len = htons(skb->len - size);
 98         ip6h->daddr = *(struct in6_addr *)&x->sel.daddr.a6;
 99         ip6h->saddr = *(struct in6_addr *)&x->sel.saddr.a6;
100         err = 0;
101 out:
102         return err;
103 }
104 
105 static struct xfrm_mode xfrm6_beet_mode = {
106         .input2 = xfrm6_beet_input,
107         .input = xfrm_prepare_input,
108         .output2 = xfrm6_beet_output,
109         .output = xfrm6_prepare_output,
110         .owner = THIS_MODULE,
111         .encap = XFRM_MODE_BEET,
112         .flags = XFRM_MODE_FLAG_TUNNEL,
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);
132 

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