07a936260a
#if defined(CONFIG_FOO) || defined(CONFIG_FOO_MODULE) can be replaced by #if IS_ENABLED(CONFIG_FOO) Cc: David S. Miller <davem@davemloft.net> Signed-off-by: Cong Wang <amwang@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
91 lines
2.5 KiB
C
91 lines
2.5 KiB
C
/*
|
|
* Copyright (c) 2011 Patrick Mchardy <kaber@trash.net>
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License version 2 as
|
|
* published by the Free Software Foundation.
|
|
*
|
|
* Based on Rusty Russell's IPv4 ICMP NAT code. Development of IPv6
|
|
* NAT funded by Astaro.
|
|
*/
|
|
|
|
#include <linux/types.h>
|
|
#include <linux/init.h>
|
|
#include <linux/icmpv6.h>
|
|
|
|
#include <linux/netfilter.h>
|
|
#include <net/netfilter/nf_nat.h>
|
|
#include <net/netfilter/nf_nat_core.h>
|
|
#include <net/netfilter/nf_nat_l3proto.h>
|
|
#include <net/netfilter/nf_nat_l4proto.h>
|
|
|
|
static bool
|
|
icmpv6_in_range(const struct nf_conntrack_tuple *tuple,
|
|
enum nf_nat_manip_type maniptype,
|
|
const union nf_conntrack_man_proto *min,
|
|
const union nf_conntrack_man_proto *max)
|
|
{
|
|
return ntohs(tuple->src.u.icmp.id) >= ntohs(min->icmp.id) &&
|
|
ntohs(tuple->src.u.icmp.id) <= ntohs(max->icmp.id);
|
|
}
|
|
|
|
static void
|
|
icmpv6_unique_tuple(const struct nf_nat_l3proto *l3proto,
|
|
struct nf_conntrack_tuple *tuple,
|
|
const struct nf_nat_range *range,
|
|
enum nf_nat_manip_type maniptype,
|
|
const struct nf_conn *ct)
|
|
{
|
|
static u16 id;
|
|
unsigned int range_size;
|
|
unsigned int i;
|
|
|
|
range_size = ntohs(range->max_proto.icmp.id) -
|
|
ntohs(range->min_proto.icmp.id) + 1;
|
|
|
|
if (!(range->flags & NF_NAT_RANGE_PROTO_SPECIFIED))
|
|
range_size = 0xffff;
|
|
|
|
for (i = 0; ; ++id) {
|
|
tuple->src.u.icmp.id = htons(ntohs(range->min_proto.icmp.id) +
|
|
(id % range_size));
|
|
if (++i == range_size || !nf_nat_used_tuple(tuple, ct))
|
|
return;
|
|
}
|
|
}
|
|
|
|
static bool
|
|
icmpv6_manip_pkt(struct sk_buff *skb,
|
|
const struct nf_nat_l3proto *l3proto,
|
|
unsigned int iphdroff, unsigned int hdroff,
|
|
const struct nf_conntrack_tuple *tuple,
|
|
enum nf_nat_manip_type maniptype)
|
|
{
|
|
struct icmp6hdr *hdr;
|
|
|
|
if (!skb_make_writable(skb, hdroff + sizeof(*hdr)))
|
|
return false;
|
|
|
|
hdr = (struct icmp6hdr *)(skb->data + hdroff);
|
|
l3proto->csum_update(skb, iphdroff, &hdr->icmp6_cksum,
|
|
tuple, maniptype);
|
|
if (hdr->icmp6_code == ICMPV6_ECHO_REQUEST ||
|
|
hdr->icmp6_code == ICMPV6_ECHO_REPLY) {
|
|
inet_proto_csum_replace2(&hdr->icmp6_cksum, skb,
|
|
hdr->icmp6_identifier,
|
|
tuple->src.u.icmp.id, 0);
|
|
hdr->icmp6_identifier = tuple->src.u.icmp.id;
|
|
}
|
|
return true;
|
|
}
|
|
|
|
const struct nf_nat_l4proto nf_nat_l4proto_icmpv6 = {
|
|
.l4proto = IPPROTO_ICMPV6,
|
|
.manip_pkt = icmpv6_manip_pkt,
|
|
.in_range = icmpv6_in_range,
|
|
.unique_tuple = icmpv6_unique_tuple,
|
|
#if IS_ENABLED(CONFIG_NF_CT_NETLINK)
|
|
.nlattr_to_range = nf_nat_l4proto_nlattr_to_range,
|
|
#endif
|
|
};
|