Release 4.8 net/ipv6/netfilter/nf_dup_ipv6.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 bool nf_dup_ipv6_route(struct net *net, struct sk_buff *skb,
const struct in6_addr *gw, int oif)
{
const struct ipv6hdr *iph = ipv6_hdr(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]);
fl6.flowi6_flags = FLOWI_FLAG_KNOWN_NH;
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;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| pablo neira ayuso | pablo neira ayuso | 176 | 94.12% | 2 | 50.00% |
| paolo abeni | paolo abeni | 6 | 3.21% | 1 | 25.00% |
| eric w. biederman | eric w. biederman | 5 | 2.67% | 1 | 25.00% |
| Total | 187 | 100.00% | 4 | 100.00% |
void nf_dup_ipv6(struct net *net, 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(net, skb, gw, oif)) {
__this_cpu_write(nf_skb_duplicated, true);
ip6_local_out(net, skb->sk, skb);
__this_cpu_write(nf_skb_duplicated, false);
} else {
kfree_skb(skb);
}
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| pablo neira ayuso | pablo neira ayuso | 152 | 92.12% | 2 | 40.00% |
| eric w. biederman | eric w. biederman | 13 | 7.88% | 3 | 60.00% |
| Total | 165 | 100.00% | 5 | 100.00% |
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");
Overall Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| pablo neira ayuso | pablo neira ayuso | 383 | 93.41% | 3 | 37.50% |
| eric w. biederman | eric w. biederman | 18 | 4.39% | 3 | 37.50% |
| paolo abeni | paolo abeni | 6 | 1.46% | 1 | 12.50% |
| daniel borkmann | daniel borkmann | 3 | 0.73% | 1 | 12.50% |
| Total | 410 | 100.00% | 8 | 100.00% |
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