mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-25 02:09:42 +00:00
![Daniel Borkmann](/assets/img/avatar_default.png)
While testing various Kconfig options on another issue, I found that
the following one triggers as well on allmodconfig and nf_conntrack
disabled:
net/ipv4/netfilter/nf_dup_ipv4.c: In function ‘nf_dup_ipv4’:
net/ipv4/netfilter/nf_dup_ipv4.c:72:20: error: ‘nf_skb_duplicated’ undeclared (first use in this function)
if (this_cpu_read(nf_skb_duplicated))
[...]
net/ipv6/netfilter/nf_dup_ipv6.c: In function ‘nf_dup_ipv6’:
net/ipv6/netfilter/nf_dup_ipv6.c:66:20: error: ‘nf_skb_duplicated’ undeclared (first use in this function)
if (this_cpu_read(nf_skb_duplicated))
Fix it by including directly the header where it is defined.
Fixes: bbde9fc182
("netfilter: factor out packet duplication for IPv4/IPv6")
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
97 lines
2.5 KiB
C
97 lines
2.5 KiB
C
/*
|
|
* (C) 2007 by Sebastian Claßen <sebastian.classen@freenet.ag>
|
|
* (C) 2007-2010 by Jan Engelhardt <jengelh@medozas.de>
|
|
*
|
|
* Extracted from xt_TEE.c
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify it
|
|
* under the terms of the GNU General Public License version 2 or later, as
|
|
* published by the Free Software Foundation.
|
|
*/
|
|
#include <linux/module.h>
|
|
#include <linux/percpu.h>
|
|
#include <linux/skbuff.h>
|
|
#include <linux/netfilter.h>
|
|
#include <net/ipv6.h>
|
|
#include <net/ip6_route.h>
|
|
#include <net/netfilter/ipv6/nf_dup_ipv6.h>
|
|
#if IS_ENABLED(CONFIG_NF_CONNTRACK)
|
|
#include <net/netfilter/nf_conntrack.h>
|
|
#endif
|
|
|
|
static struct net *pick_net(struct sk_buff *skb)
|
|
{
|
|
#ifdef CONFIG_NET_NS
|
|
const struct dst_entry *dst;
|
|
|
|
if (skb->dev != NULL)
|
|
return dev_net(skb->dev);
|
|
dst = skb_dst(skb);
|
|
if (dst != NULL && dst->dev != NULL)
|
|
return dev_net(dst->dev);
|
|
#endif
|
|
return &init_net;
|
|
}
|
|
|
|
static bool nf_dup_ipv6_route(struct sk_buff *skb, const struct in6_addr *gw,
|
|
int oif)
|
|
{
|
|
const struct ipv6hdr *iph = ipv6_hdr(skb);
|
|
struct net *net = pick_net(skb);
|
|
struct dst_entry *dst;
|
|
struct flowi6 fl6;
|
|
|
|
memset(&fl6, 0, sizeof(fl6));
|
|
if (oif != -1)
|
|
fl6.flowi6_oif = oif;
|
|
|
|
fl6.daddr = *gw;
|
|
fl6.flowlabel = (__force __be32)(((iph->flow_lbl[0] & 0xF) << 16) |
|
|
(iph->flow_lbl[1] << 8) | iph->flow_lbl[2]);
|
|
dst = ip6_route_output(net, NULL, &fl6);
|
|
if (dst->error) {
|
|
dst_release(dst);
|
|
return false;
|
|
}
|
|
skb_dst_drop(skb);
|
|
skb_dst_set(skb, dst);
|
|
skb->dev = dst->dev;
|
|
skb->protocol = htons(ETH_P_IPV6);
|
|
|
|
return true;
|
|
}
|
|
|
|
void nf_dup_ipv6(struct sk_buff *skb, unsigned int hooknum,
|
|
const struct in6_addr *gw, int oif)
|
|
{
|
|
if (this_cpu_read(nf_skb_duplicated))
|
|
return;
|
|
skb = pskb_copy(skb, GFP_ATOMIC);
|
|
if (skb == NULL)
|
|
return;
|
|
|
|
#if IS_ENABLED(CONFIG_NF_CONNTRACK)
|
|
nf_conntrack_put(skb->nfct);
|
|
skb->nfct = &nf_ct_untracked_get()->ct_general;
|
|
skb->nfctinfo = IP_CT_NEW;
|
|
nf_conntrack_get(skb->nfct);
|
|
#endif
|
|
if (hooknum == NF_INET_PRE_ROUTING ||
|
|
hooknum == NF_INET_LOCAL_IN) {
|
|
struct ipv6hdr *iph = ipv6_hdr(skb);
|
|
--iph->hop_limit;
|
|
}
|
|
if (nf_dup_ipv6_route(skb, gw, oif)) {
|
|
__this_cpu_write(nf_skb_duplicated, true);
|
|
ip6_local_out(skb);
|
|
__this_cpu_write(nf_skb_duplicated, false);
|
|
} else {
|
|
kfree_skb(skb);
|
|
}
|
|
}
|
|
EXPORT_SYMBOL_GPL(nf_dup_ipv6);
|
|
|
|
MODULE_AUTHOR("Sebastian Claßen <sebastian.classen@freenet.ag>");
|
|
MODULE_AUTHOR("Jan Engelhardt <jengelh@medozas.de>");
|
|
MODULE_DESCRIPTION("nf_dup_ipv6: IPv6 packet duplication");
|
|
MODULE_LICENSE("GPL");
|