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Diffstat (limited to 'net/ipv4/netfilter/nf_nat_l3proto_ipv4.c')
-rw-r--r--net/ipv4/netfilter/nf_nat_l3proto_ipv4.c143
1 files changed, 58 insertions, 85 deletions
diff --git a/net/ipv4/netfilter/nf_nat_l3proto_ipv4.c b/net/ipv4/netfilter/nf_nat_l3proto_ipv4.c
index f7ff6a364d7b..6115bf1ff6f0 100644
--- a/net/ipv4/netfilter/nf_nat_l3proto_ipv4.c
+++ b/net/ipv4/netfilter/nf_nat_l3proto_ipv4.c
@@ -63,7 +63,7 @@ static void nf_nat_ipv4_decode_session(struct sk_buff *skb,
#endif /* CONFIG_XFRM */
static bool nf_nat_ipv4_in_range(const struct nf_conntrack_tuple *t,
- const struct nf_nat_range *range)
+ const struct nf_nat_range2 *range)
{
return ntohl(t->src.u3.ip) >= ntohl(range->min_addr.ip) &&
ntohl(t->src.u3.ip) <= ntohl(range->max_addr.ip);
@@ -143,7 +143,7 @@ static void nf_nat_ipv4_csum_recalc(struct sk_buff *skb,
#if IS_ENABLED(CONFIG_NF_CT_NETLINK)
static int nf_nat_ipv4_nlattr_to_range(struct nlattr *tb[],
- struct nf_nat_range *range)
+ struct nf_nat_range2 *range)
{
if (tb[CTA_NAT_V4_MINIP]) {
range->min_addr.ip = nla_get_be32(tb[CTA_NAT_V4_MINIP]);
@@ -241,34 +241,18 @@ int nf_nat_icmp_reply_translation(struct sk_buff *skb,
}
EXPORT_SYMBOL_GPL(nf_nat_icmp_reply_translation);
-unsigned int
+static unsigned int
nf_nat_ipv4_fn(void *priv, struct sk_buff *skb,
- const struct nf_hook_state *state,
- unsigned int (*do_chain)(void *priv,
- struct sk_buff *skb,
- const struct nf_hook_state *state,
- struct nf_conn *ct))
+ const struct nf_hook_state *state)
{
struct nf_conn *ct;
enum ip_conntrack_info ctinfo;
- struct nf_conn_nat *nat;
- /* maniptype == SRC for postrouting. */
- enum nf_nat_manip_type maniptype = HOOK2MANIP(state->hook);
ct = nf_ct_get(skb, &ctinfo);
- /* Can't track? It's not due to stress, or conntrack would
- * have dropped it. Hence it's the user's responsibilty to
- * packet filter it out, or implement conntrack/NAT for that
- * protocol. 8) --RR
- */
if (!ct)
return NF_ACCEPT;
- nat = nfct_nat(ct);
-
- switch (ctinfo) {
- case IP_CT_RELATED:
- case IP_CT_RELATED_REPLY:
+ if (ctinfo == IP_CT_RELATED || ctinfo == IP_CT_RELATED_REPLY) {
if (ip_hdr(skb)->protocol == IPPROTO_ICMP) {
if (!nf_nat_icmp_reply_translation(skb, ct, ctinfo,
state->hook))
@@ -276,78 +260,30 @@ nf_nat_ipv4_fn(void *priv, struct sk_buff *skb,
else
return NF_ACCEPT;
}
- /* Only ICMPs can be IP_CT_IS_REPLY: */
- /* fall through */
- case IP_CT_NEW:
- /* Seen it before? This can happen for loopback, retrans,
- * or local packets.
- */
- if (!nf_nat_initialized(ct, maniptype)) {
- unsigned int ret;
-
- ret = do_chain(priv, skb, state, ct);
- if (ret != NF_ACCEPT)
- return ret;
-
- if (nf_nat_initialized(ct, HOOK2MANIP(state->hook)))
- break;
-
- ret = nf_nat_alloc_null_binding(ct, state->hook);
- if (ret != NF_ACCEPT)
- return ret;
- } else {
- pr_debug("Already setup manip %s for ct %p\n",
- maniptype == NF_NAT_MANIP_SRC ? "SRC" : "DST",
- ct);
- if (nf_nat_oif_changed(state->hook, ctinfo, nat,
- state->out))
- goto oif_changed;
- }
- break;
-
- default:
- /* ESTABLISHED */
- WARN_ON(ctinfo != IP_CT_ESTABLISHED &&
- ctinfo != IP_CT_ESTABLISHED_REPLY);
- if (nf_nat_oif_changed(state->hook, ctinfo, nat, state->out))
- goto oif_changed;
}
- return nf_nat_packet(ct, ctinfo, state->hook, skb);
-
-oif_changed:
- nf_ct_kill_acct(ct, ctinfo, skb);
- return NF_DROP;
+ return nf_nat_inet_fn(priv, skb, state);
}
EXPORT_SYMBOL_GPL(nf_nat_ipv4_fn);
-unsigned int
+static unsigned int
nf_nat_ipv4_in(void *priv, struct sk_buff *skb,
- const struct nf_hook_state *state,
- unsigned int (*do_chain)(void *priv,
- struct sk_buff *skb,
- const struct nf_hook_state *state,
- struct nf_conn *ct))
+ const struct nf_hook_state *state)
{
unsigned int ret;
__be32 daddr = ip_hdr(skb)->daddr;
- ret = nf_nat_ipv4_fn(priv, skb, state, do_chain);
+ ret = nf_nat_ipv4_fn(priv, skb, state);
if (ret != NF_DROP && ret != NF_STOLEN &&
daddr != ip_hdr(skb)->daddr)
skb_dst_drop(skb);
return ret;
}
-EXPORT_SYMBOL_GPL(nf_nat_ipv4_in);
-unsigned int
+static unsigned int
nf_nat_ipv4_out(void *priv, struct sk_buff *skb,
- const struct nf_hook_state *state,
- unsigned int (*do_chain)(void *priv,
- struct sk_buff *skb,
- const struct nf_hook_state *state,
- struct nf_conn *ct))
+ const struct nf_hook_state *state)
{
#ifdef CONFIG_XFRM
const struct nf_conn *ct;
@@ -356,7 +292,7 @@ nf_nat_ipv4_out(void *priv, struct sk_buff *skb,
#endif
unsigned int ret;
- ret = nf_nat_ipv4_fn(priv, skb, state, do_chain);
+ ret = nf_nat_ipv4_fn(priv, skb, state);
#ifdef CONFIG_XFRM
if (ret != NF_DROP && ret != NF_STOLEN &&
!(IPCB(skb)->flags & IPSKB_XFRM_TRANSFORMED) &&
@@ -376,22 +312,17 @@ nf_nat_ipv4_out(void *priv, struct sk_buff *skb,
#endif
return ret;
}
-EXPORT_SYMBOL_GPL(nf_nat_ipv4_out);
-unsigned int
+static unsigned int
nf_nat_ipv4_local_fn(void *priv, struct sk_buff *skb,
- const struct nf_hook_state *state,
- unsigned int (*do_chain)(void *priv,
- struct sk_buff *skb,
- const struct nf_hook_state *state,
- struct nf_conn *ct))
+ const struct nf_hook_state *state)
{
const struct nf_conn *ct;
enum ip_conntrack_info ctinfo;
unsigned int ret;
int err;
- ret = nf_nat_ipv4_fn(priv, skb, state, do_chain);
+ ret = nf_nat_ipv4_fn(priv, skb, state);
if (ret != NF_DROP && ret != NF_STOLEN &&
(ct = nf_ct_get(skb, &ctinfo)) != NULL) {
enum ip_conntrack_dir dir = CTINFO2DIR(ctinfo);
@@ -415,7 +346,49 @@ nf_nat_ipv4_local_fn(void *priv, struct sk_buff *skb,
}
return ret;
}
-EXPORT_SYMBOL_GPL(nf_nat_ipv4_local_fn);
+
+static const struct nf_hook_ops nf_nat_ipv4_ops[] = {
+ /* Before packet filtering, change destination */
+ {
+ .hook = nf_nat_ipv4_in,
+ .pf = NFPROTO_IPV4,
+ .hooknum = NF_INET_PRE_ROUTING,
+ .priority = NF_IP_PRI_NAT_DST,
+ },
+ /* After packet filtering, change source */
+ {
+ .hook = nf_nat_ipv4_out,
+ .pf = NFPROTO_IPV4,
+ .hooknum = NF_INET_POST_ROUTING,
+ .priority = NF_IP_PRI_NAT_SRC,
+ },
+ /* Before packet filtering, change destination */
+ {
+ .hook = nf_nat_ipv4_local_fn,
+ .pf = NFPROTO_IPV4,
+ .hooknum = NF_INET_LOCAL_OUT,
+ .priority = NF_IP_PRI_NAT_DST,
+ },
+ /* After packet filtering, change source */
+ {
+ .hook = nf_nat_ipv4_fn,
+ .pf = NFPROTO_IPV4,
+ .hooknum = NF_INET_LOCAL_IN,
+ .priority = NF_IP_PRI_NAT_SRC,
+ },
+};
+
+int nf_nat_l3proto_ipv4_register_fn(struct net *net, const struct nf_hook_ops *ops)
+{
+ return nf_nat_register_fn(net, ops, nf_nat_ipv4_ops, ARRAY_SIZE(nf_nat_ipv4_ops));
+}
+EXPORT_SYMBOL_GPL(nf_nat_l3proto_ipv4_register_fn);
+
+void nf_nat_l3proto_ipv4_unregister_fn(struct net *net, const struct nf_hook_ops *ops)
+{
+ nf_nat_unregister_fn(net, ops, ARRAY_SIZE(nf_nat_ipv4_ops));
+}
+EXPORT_SYMBOL_GPL(nf_nat_l3proto_ipv4_unregister_fn);
static int __init nf_nat_l3proto_ipv4_init(void)
{
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.