diff options
Diffstat (limited to 'net/ipv6/xfrm6_mode_beet.c')
-rw-r--r-- | net/ipv6/xfrm6_mode_beet.c | 107 |
1 files changed, 107 insertions, 0 deletions
diff --git a/net/ipv6/xfrm6_mode_beet.c b/net/ipv6/xfrm6_mode_beet.c new file mode 100644 index 0000000..edcfffa --- /dev/null +++ b/net/ipv6/xfrm6_mode_beet.c @@ -0,0 +1,107 @@ +/* + * 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); |