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netfilter: nat: move nf_xfrm_me_harder to where it is used 

remove the export and make it static.

Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Florian Westphal 2021-04-19 18:16:49 +02:00 committed by Pablo Neira Ayuso
parent b2f0ca00e6
commit 885e8c6824
3 changed files with 38 additions and 39 deletions
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2
include/net/netfilter/nf_nat.h
View File

@ -104,8 +104,6 @@ unsigned int
nf_nat_inet_fn(void *priv, struct sk_buff *skb,
const struct nf_hook_state *state);
int nf_xfrm_me_harder(struct net *n, struct sk_buff *s, unsigned int family);
static inline int nf_nat_initialized(struct nf_conn *ct,
enum nf_nat_manip_type manip)
{

37
net/netfilter/nf_nat_core.c
View File

@ -146,43 +146,6 @@ static void __nf_nat_decode_session(struct sk_buff *skb, struct flowi *fl)
return;
}
}
int nf_xfrm_me_harder(struct net *net, struct sk_buff *skb, unsigned int family)
{
struct flowi fl;
unsigned int hh_len;
struct dst_entry *dst;
struct sock *sk = skb->sk;
int err;
err = xfrm_decode_session(skb, &fl, family);
if (err < 0)
return err;
dst = skb_dst(skb);
if (dst->xfrm)
dst = ((struct xfrm_dst *)dst)->route;
if (!dst_hold_safe(dst))
return -EHOSTUNREACH;
if (sk && !net_eq(net, sock_net(sk)))
sk = NULL;
dst = xfrm_lookup(net, dst, &fl, sk, 0);
if (IS_ERR(dst))
return PTR_ERR(dst);
skb_dst_drop(skb);
skb_dst_set(skb, dst);
/* Change in oif may mean change in hh_len. */
hh_len = skb_dst(skb)->dev->hard_header_len;
if (skb_headroom(skb) < hh_len &&
pskb_expand_head(skb, hh_len - skb_headroom(skb), 0, GFP_ATOMIC))
return -ENOMEM;
return 0;
}
EXPORT_SYMBOL(nf_xfrm_me_harder);
#endif /* CONFIG_XFRM */
/* We keep an extra hash for each conntrack, for fast searching. */

38
net/netfilter/nf_nat_proto.c
View File

@ -659,6 +659,44 @@ nf_nat_ipv4_pre_routing(void *priv, struct sk_buff *skb,
return ret;
}
#ifdef CONFIG_XFRM
static int nf_xfrm_me_harder(struct net *net, struct sk_buff *skb, unsigned int family)
{
struct sock *sk = skb->sk;
struct dst_entry *dst;
unsigned int hh_len;
struct flowi fl;
int err;
err = xfrm_decode_session(skb, &fl, family);
if (err < 0)
return err;
dst = skb_dst(skb);
if (dst->xfrm)
dst = ((struct xfrm_dst *)dst)->route;
if (!dst_hold_safe(dst))
return -EHOSTUNREACH;
if (sk && !net_eq(net, sock_net(sk)))
sk = NULL;
dst = xfrm_lookup(net, dst, &fl, sk, 0);
if (IS_ERR(dst))
return PTR_ERR(dst);
skb_dst_drop(skb);
skb_dst_set(skb, dst);
/* Change in oif may mean change in hh_len. */
hh_len = skb_dst(skb)->dev->hard_header_len;
if (skb_headroom(skb) < hh_len &&
pskb_expand_head(skb, hh_len - skb_headroom(skb), 0, GFP_ATOMIC))
return -ENOMEM;
return 0;
}
#endif
static unsigned int
nf_nat_ipv4_local_in(void *priv, struct sk_buff *skb,
const struct nf_hook_state *state)