95 lines
2.1 KiB
C
95 lines
2.1 KiB
C
/*
|
|
* xfrm6_output.c - Common IPsec encapsulation code for IPv6.
|
|
* Copyright (C) 2002 USAGI/WIDE Project
|
|
* Copyright (c) 2004 Herbert Xu <herbert@gondor.apana.org.au>
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License
|
|
* as published by the Free Software Foundation; either version
|
|
* 2 of the License, or (at your option) any later version.
|
|
*/
|
|
|
|
#include <linux/if_ether.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/module.h>
|
|
#include <linux/skbuff.h>
|
|
#include <linux/icmpv6.h>
|
|
#include <linux/netfilter_ipv6.h>
|
|
#include <net/dst.h>
|
|
#include <net/ipv6.h>
|
|
#include <net/xfrm.h>
|
|
|
|
int xfrm6_find_1stfragopt(struct xfrm_state *x, struct sk_buff *skb,
|
|
u8 **prevhdr)
|
|
{
|
|
return ip6_find_1stfragopt(skb, prevhdr);
|
|
}
|
|
|
|
EXPORT_SYMBOL(xfrm6_find_1stfragopt);
|
|
|
|
static int xfrm6_tunnel_check_size(struct sk_buff *skb)
|
|
{
|
|
int mtu, ret = 0;
|
|
struct dst_entry *dst = skb->dst;
|
|
|
|
mtu = dst_mtu(dst);
|
|
if (mtu < IPV6_MIN_MTU)
|
|
mtu = IPV6_MIN_MTU;
|
|
|
|
if (skb->len > mtu) {
|
|
skb->dev = dst->dev;
|
|
icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu, skb->dev);
|
|
ret = -EMSGSIZE;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
int xfrm6_extract_output(struct xfrm_state *x, struct sk_buff *skb)
|
|
{
|
|
int err;
|
|
|
|
err = xfrm6_tunnel_check_size(skb);
|
|
if (err)
|
|
return err;
|
|
|
|
XFRM_MODE_SKB_CB(skb)->protocol = ipv6_hdr(skb)->nexthdr;
|
|
|
|
return xfrm6_extract_header(skb);
|
|
}
|
|
|
|
int xfrm6_prepare_output(struct xfrm_state *x, struct sk_buff *skb)
|
|
{
|
|
int err;
|
|
|
|
err = x->inner_mode->afinfo->extract_output(x, skb);
|
|
if (err)
|
|
return err;
|
|
|
|
memset(IP6CB(skb), 0, sizeof(*IP6CB(skb)));
|
|
#ifdef CONFIG_NETFILTER
|
|
IP6CB(skb)->flags |= IP6SKB_XFRM_TRANSFORMED;
|
|
#endif
|
|
|
|
skb->protocol = htons(ETH_P_IPV6);
|
|
|
|
return x->outer_mode->output2(x, skb);
|
|
}
|
|
EXPORT_SYMBOL(xfrm6_prepare_output);
|
|
|
|
static int xfrm6_output_finish(struct sk_buff *skb)
|
|
{
|
|
#ifdef CONFIG_NETFILTER
|
|
IP6CB(skb)->flags |= IP6SKB_XFRM_TRANSFORMED;
|
|
#endif
|
|
|
|
skb->protocol = htons(ETH_P_IPV6);
|
|
return xfrm_output(skb);
|
|
}
|
|
|
|
int xfrm6_output(struct sk_buff *skb)
|
|
{
|
|
return NF_HOOK(PF_INET6, NF_INET_POST_ROUTING, skb, NULL, skb->dst->dev,
|
|
xfrm6_output_finish);
|
|
}
|