]>
git.proxmox.com Git - mirror_ubuntu-artful-kernel.git/blob - net/ipv6/netfilter/nf_dup_ipv6.c
2 * (C) 2007 by Sebastian Claßen <sebastian.classen@freenet.ag>
3 * (C) 2007-2010 by Jan Engelhardt <jengelh@medozas.de>
5 * Extracted from xt_TEE.c
7 * This program is free software; you can redistribute it and/or modify it
8 * under the terms of the GNU General Public License version 2 or later, as
9 * published by the Free Software Foundation.
11 #include <linux/module.h>
12 #include <linux/percpu.h>
13 #include <linux/skbuff.h>
14 #include <linux/netfilter.h>
16 #include <net/ip6_route.h>
17 #include <net/netfilter/ipv6/nf_dup_ipv6.h>
18 #if IS_ENABLED(CONFIG_NF_CONNTRACK)
19 #include <net/netfilter/nf_conntrack.h>
22 static bool nf_dup_ipv6_route(struct net
*net
, struct sk_buff
*skb
,
23 const struct in6_addr
*gw
, int oif
)
25 const struct ipv6hdr
*iph
= ipv6_hdr(skb
);
26 struct dst_entry
*dst
;
29 memset(&fl6
, 0, sizeof(fl6
));
34 fl6
.flowlabel
= (__force __be32
)(((iph
->flow_lbl
[0] & 0xF) << 16) |
35 (iph
->flow_lbl
[1] << 8) | iph
->flow_lbl
[2]);
36 fl6
.flowi6_flags
= FLOWI_FLAG_KNOWN_NH
;
37 dst
= ip6_route_output(net
, NULL
, &fl6
);
43 skb_dst_set(skb
, dst
);
45 skb
->protocol
= htons(ETH_P_IPV6
);
50 void nf_dup_ipv6(struct net
*net
, struct sk_buff
*skb
, unsigned int hooknum
,
51 const struct in6_addr
*gw
, int oif
)
53 if (this_cpu_read(nf_skb_duplicated
))
55 skb
= pskb_copy(skb
, GFP_ATOMIC
);
59 #if IS_ENABLED(CONFIG_NF_CONNTRACK)
60 nf_conntrack_put(skb
->nfct
);
61 skb
->nfct
= &nf_ct_untracked_get()->ct_general
;
62 skb
->nfctinfo
= IP_CT_NEW
;
63 nf_conntrack_get(skb
->nfct
);
65 if (hooknum
== NF_INET_PRE_ROUTING
||
66 hooknum
== NF_INET_LOCAL_IN
) {
67 struct ipv6hdr
*iph
= ipv6_hdr(skb
);
70 if (nf_dup_ipv6_route(net
, skb
, gw
, oif
)) {
71 __this_cpu_write(nf_skb_duplicated
, true);
72 ip6_local_out(net
, skb
->sk
, skb
);
73 __this_cpu_write(nf_skb_duplicated
, false);
78 EXPORT_SYMBOL_GPL(nf_dup_ipv6
);
80 MODULE_AUTHOR("Sebastian Claßen <sebastian.classen@freenet.ag>");
81 MODULE_AUTHOR("Jan Engelhardt <jengelh@medozas.de>");
82 MODULE_DESCRIPTION("nf_dup_ipv6: IPv6 packet duplication");
83 MODULE_LICENSE("GPL");