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- /*
- * xfrm6_mode_beet.c - BEET mode encapsulation for IPv6.
- *
- * Copyright (c) 2006 Diego Beltrami <diego.beltrami@gmail.com>
- * Miika Komu <miika@iki.fi>
- * Herbert Xu <herbert@gondor.apana.org.au>
- * Abhinav Pathak <abhinav.pathak@hiit.fi>
- * Jeff Ahrenholz <ahrenholz@gmail.com>
- */
- #include <linux/init.h>
- #include <linux/kernel.h>
- #include <linux/module.h>
- #include <linux/skbuff.h>
- #include <linux/stringify.h>
- #include <net/dsfield.h>
- #include <net/dst.h>
- #include <net/inet_ecn.h>
- #include <net/ipv6.h>
- #include <net/xfrm.h>
- /* Add encapsulation header.
- *
- * The top IP header will be constructed per draft-nikander-esp-beet-mode-06.txt.
- * The following fields in it shall be filled in by x->type->output:
- * payload_len
- *
- * On exit, skb->h will be set to the start of the encapsulation header to be
- * filled in by x->type->output and skb->nh will be set to the nextheader field
- * of the extension header directly preceding the encapsulation header, or in
- * its absence, that of the top IP header. The value of skb->data will always
- * point to the top IP header.
- */
- static int xfrm6_beet_output(struct xfrm_state *x, struct sk_buff *skb)
- {
- struct ipv6hdr *iph, *top_iph;
- u8 *prevhdr;
- int hdr_len;
- skb_push(skb, x->props.header_len);
- iph = skb->nh.ipv6h;
- hdr_len = ip6_find_1stfragopt(skb, &prevhdr);
- skb->nh.raw = prevhdr - x->props.header_len;
- skb->h.raw = skb->data + hdr_len;
- memmove(skb->data, iph, hdr_len);
- skb->nh.raw = skb->data;
- top_iph = skb->nh.ipv6h;
- skb->nh.raw = &top_iph->nexthdr;
- skb->h.ipv6h = top_iph + 1;
- ipv6_addr_copy(&top_iph->saddr, (struct in6_addr *)&x->props.saddr);
- ipv6_addr_copy(&top_iph->daddr, (struct in6_addr *)&x->id.daddr);
- return 0;
- }
- static int xfrm6_beet_input(struct xfrm_state *x, struct sk_buff *skb)
- {
- struct ipv6hdr *ip6h;
- int size = sizeof(struct ipv6hdr);
- int err = -EINVAL;
- if (!pskb_may_pull(skb, sizeof(struct ipv6hdr)))
- goto out;
- skb_push(skb, size);
- memmove(skb->data, skb->nh.raw, size);
- skb->nh.raw = skb->data;
- skb->mac.raw = memmove(skb->data - skb->mac_len,
- skb->mac.raw, skb->mac_len);
- ip6h = skb->nh.ipv6h;
- ip6h->payload_len = htons(skb->len - size);
- ipv6_addr_copy(&ip6h->daddr, (struct in6_addr *) &x->sel.daddr.a6);
- ipv6_addr_copy(&ip6h->saddr, (struct in6_addr *) &x->sel.saddr.a6);
- err = 0;
- out:
- return err;
- }
- static struct xfrm_mode xfrm6_beet_mode = {
- .input = xfrm6_beet_input,
- .output = xfrm6_beet_output,
- .owner = THIS_MODULE,
- .encap = XFRM_MODE_BEET,
- };
- static int __init xfrm6_beet_init(void)
- {
- return xfrm_register_mode(&xfrm6_beet_mode, AF_INET6);
- }
- static void __exit xfrm6_beet_exit(void)
- {
- int err;
- err = xfrm_unregister_mode(&xfrm6_beet_mode, AF_INET6);
- BUG_ON(err);
- }
- module_init(xfrm6_beet_init);
- module_exit(xfrm6_beet_exit);
- MODULE_LICENSE("GPL");
- MODULE_ALIAS_XFRM_MODE(AF_INET6, XFRM_MODE_BEET);
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