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netfilter: masquerade: attach nat extension if not present

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Currently the nat extension is always attached as soon as nat module is
loaded.  However, most NAT uses do not need the nat extension anymore.

Prepare to remove the add-nat-by-default by making those places that need
it attach it if its not present yet.

Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Florian Westphal 2017-04-20 10:11:33 +02:00 committed by Pablo Neira Ayuso
parent 22d4536d2c
commit ff459018d7
2 changed files with 7 additions and 3 deletions
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5
net/ipv4/netfilter/nf_nat_masquerade_ipv4.c
View File

@ -37,7 +37,6 @@ nf_nat_masquerade_ipv4(struct sk_buff *skb, unsigned int hooknum,
NF_CT_ASSERT(hooknum == NF_INET_POST_ROUTING); NF_CT_ASSERT(hooknum == NF_INET_POST_ROUTING);
ct = nf_ct_get(skb, &ctinfo); ct = nf_ct_get(skb, &ctinfo);
nat = nfct_nat(ct);
NF_CT_ASSERT(ct && (ctinfo == IP_CT_NEW || ctinfo == IP_CT_RELATED || NF_CT_ASSERT(ct && (ctinfo == IP_CT_NEW || ctinfo == IP_CT_RELATED ||
ctinfo == IP_CT_RELATED_REPLY)); ctinfo == IP_CT_RELATED_REPLY));
@ -56,7 +55,9 @@ nf_nat_masquerade_ipv4(struct sk_buff *skb, unsigned int hooknum,
return NF_DROP; return NF_DROP;
} }
nat->masq_index = out->ifindex; nat = nf_ct_nat_ext_add(ct);
if (nat)
nat->masq_index = out->ifindex;
/* Transfer from original range. */ /* Transfer from original range. */
memset(&newrange.min_addr, 0, sizeof(newrange.min_addr)); memset(&newrange.min_addr, 0, sizeof(newrange.min_addr));

5
net/ipv6/netfilter/nf_nat_masquerade_ipv6.c
View File

@ -30,6 +30,7 @@ nf_nat_masquerade_ipv6(struct sk_buff *skb, const struct nf_nat_range *range,
const struct net_device *out) const struct net_device *out)
{ {
enum ip_conntrack_info ctinfo; enum ip_conntrack_info ctinfo;
struct nf_conn_nat *nat;
struct in6_addr src; struct in6_addr src;
struct nf_conn *ct; struct nf_conn *ct;
struct nf_nat_range newrange; struct nf_nat_range newrange;
@ -42,7 +43,9 @@ nf_nat_masquerade_ipv6(struct sk_buff *skb, const struct nf_nat_range *range,
&ipv6_hdr(skb)->daddr, 0, &src) < 0) &ipv6_hdr(skb)->daddr, 0, &src) < 0)
return NF_DROP; return NF_DROP;
nfct_nat(ct)->masq_index = out->ifindex; nat = nf_ct_nat_ext_add(ct);
if (nat)
nat->masq_index = out->ifindex;
newrange.flags = range->flags | NF_NAT_RANGE_MAP_IPS; newrange.flags = range->flags | NF_NAT_RANGE_MAP_IPS;
newrange.min_addr.in6 = src; newrange.min_addr.in6 = src;