2ab6096db2
There are only two implementaions, one for ipv4 and one for ipv6. Both are almost identical, they clear skb->cb[], set the TRANSFORMED flag in IP(6)CB and then call the common xfrm_output() function. By placing the IPCB handling into the common function, we avoid the need for the output_finish indirection as the output functions can simply use xfrm_output(). Signed-off-by: Florian Westphal <fw@strlen.de> Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
104 lines
2.4 KiB
C
104 lines
2.4 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
|
|
/*
|
|
* 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>
|
|
*/
|
|
|
|
#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/ip6_route.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);
|
|
|
|
void xfrm6_local_rxpmtu(struct sk_buff *skb, u32 mtu)
|
|
{
|
|
struct flowi6 fl6;
|
|
struct sock *sk = skb->sk;
|
|
|
|
fl6.flowi6_oif = sk->sk_bound_dev_if;
|
|
fl6.daddr = ipv6_hdr(skb)->daddr;
|
|
|
|
ipv6_local_rxpmtu(sk, &fl6, mtu);
|
|
}
|
|
|
|
void xfrm6_local_error(struct sk_buff *skb, u32 mtu)
|
|
{
|
|
struct flowi6 fl6;
|
|
const struct ipv6hdr *hdr;
|
|
struct sock *sk = skb->sk;
|
|
|
|
hdr = skb->encapsulation ? inner_ipv6_hdr(skb) : ipv6_hdr(skb);
|
|
fl6.fl6_dport = inet_sk(sk)->inet_dport;
|
|
fl6.daddr = hdr->daddr;
|
|
|
|
ipv6_local_error(sk, EMSGSIZE, &fl6, mtu);
|
|
}
|
|
|
|
static int __xfrm6_output_finish(struct net *net, struct sock *sk, struct sk_buff *skb)
|
|
{
|
|
return xfrm_output(sk, skb);
|
|
}
|
|
|
|
static int __xfrm6_output(struct net *net, struct sock *sk, struct sk_buff *skb)
|
|
{
|
|
struct dst_entry *dst = skb_dst(skb);
|
|
struct xfrm_state *x = dst->xfrm;
|
|
int mtu;
|
|
bool toobig;
|
|
|
|
#ifdef CONFIG_NETFILTER
|
|
if (!x) {
|
|
IP6CB(skb)->flags |= IP6SKB_REROUTED;
|
|
return dst_output(net, sk, skb);
|
|
}
|
|
#endif
|
|
|
|
if (x->props.mode != XFRM_MODE_TUNNEL)
|
|
goto skip_frag;
|
|
|
|
if (skb->protocol == htons(ETH_P_IPV6))
|
|
mtu = ip6_skb_dst_mtu(skb);
|
|
else
|
|
mtu = dst_mtu(skb_dst(skb));
|
|
|
|
toobig = skb->len > mtu && !skb_is_gso(skb);
|
|
|
|
if (toobig && xfrm6_local_dontfrag(skb->sk)) {
|
|
xfrm6_local_rxpmtu(skb, mtu);
|
|
kfree_skb(skb);
|
|
return -EMSGSIZE;
|
|
} else if (!skb->ignore_df && toobig && skb->sk) {
|
|
xfrm_local_error(skb, mtu);
|
|
kfree_skb(skb);
|
|
return -EMSGSIZE;
|
|
}
|
|
|
|
if (toobig || dst_allfrag(skb_dst(skb)))
|
|
return ip6_fragment(net, sk, skb,
|
|
__xfrm6_output_finish);
|
|
|
|
skip_frag:
|
|
return xfrm_output(sk, skb);
|
|
}
|
|
|
|
int xfrm6_output(struct net *net, struct sock *sk, struct sk_buff *skb)
|
|
{
|
|
return NF_HOOK_COND(NFPROTO_IPV6, NF_INET_POST_ROUTING,
|
|
net, sk, skb, skb->dev, skb_dst(skb)->dev,
|
|
__xfrm6_output,
|
|
!(IP6CB(skb)->flags & IP6SKB_REROUTED));
|
|
}
|