netfilter: move nf_reinject into nfnetlink_queue modules

Florian Westphal · Florian Westphal · commit 3f8019688894 · 2024-02-21T12:03:22.000+01:00
No need to keep this in the core, move it to the nfnetlink_queue module.
nf_reroute is moved too, there were no other callers.

Signed-off-by: Florian Westphal &lt;fw@strlen.de&gt;
diff --git a/include/linux/netfilter.h b/include/linux/netfilter.h
@@ -370,7 +370,6 @@ __sum16 nf_checksum_partial(struct sk_buff *skb, unsigned int hook,
 			    u_int8_t protocol, unsigned short family);
 int nf_route(struct net *net, struct dst_entry **dst, struct flowi *fl,
 	     bool strict, unsigned short family);
-int nf_reroute(struct sk_buff *skb, struct nf_queue_entry *entry);
 
 #include <net/flow.h>
 
diff --git a/include/net/netfilter/nf_queue.h b/include/net/netfilter/nf_queue.h
@@ -35,7 +35,6 @@ struct nf_queue_handler {
 
 void nf_register_queue_handler(const struct nf_queue_handler *qh);
 void nf_unregister_queue_handler(void);
-void nf_reinject(struct nf_queue_entry *entry, unsigned int verdict);
 
 bool nf_queue_entry_get_refs(struct nf_queue_entry *entry);
 void nf_queue_entry_free(struct nf_queue_entry *entry);
diff --git a/net/netfilter/nf_queue.c b/net/netfilter/nf_queue.c
@@ -248,109 +248,3 @@ int nf_queue(struct sk_buff *skb, struct nf_hook_state *state,
 	return 0;
 }
 EXPORT_SYMBOL_GPL(nf_queue);
-
-static unsigned int nf_iterate(struct sk_buff *skb,
-			       struct nf_hook_state *state,
-			       const struct nf_hook_entries *hooks,
-			       unsigned int *index)
-{
-	const struct nf_hook_entry *hook;
-	unsigned int verdict, i = *index;
-
-	while (i < hooks->num_hook_entries) {
-		hook = &hooks->hooks[i];
-repeat:
-		verdict = nf_hook_entry_hookfn(hook, skb, state);
-		if (verdict != NF_ACCEPT) {
-			*index = i;
-			if (verdict != NF_REPEAT)
-				return verdict;
-			goto repeat;
-		}
-		i++;
-	}
-
-	*index = i;
-	return NF_ACCEPT;
-}
-
-static struct nf_hook_entries *nf_hook_entries_head(const struct net *net, u8 pf, u8 hooknum)
-{
-	switch (pf) {
-#ifdef CONFIG_NETFILTER_FAMILY_BRIDGE
-	case NFPROTO_BRIDGE:
-		return rcu_dereference(net->nf.hooks_bridge[hooknum]);
-#endif
-	case NFPROTO_IPV4:
-		return rcu_dereference(net->nf.hooks_ipv4[hooknum]);
-	case NFPROTO_IPV6:
-		return rcu_dereference(net->nf.hooks_ipv6[hooknum]);
-	default:
-		WARN_ON_ONCE(1);
-		return NULL;
-	}
-
-	return NULL;
-}
-
-/* Caller must hold rcu read-side lock */
-void nf_reinject(struct nf_queue_entry *entry, unsigned int verdict)
-{
-	const struct nf_hook_entry *hook_entry;
-	const struct nf_hook_entries *hooks;
-	struct sk_buff *skb = entry->skb;
-	const struct net *net;
-	unsigned int i;
-	int err;
-	u8 pf;
-
-	net = entry->state.net;
-	pf = entry->state.pf;
-
-	hooks = nf_hook_entries_head(net, pf, entry->state.hook);
-
-	i = entry->hook_index;
-	if (WARN_ON_ONCE(!hooks || i >= hooks->num_hook_entries)) {
-		kfree_skb(skb);
-		nf_queue_entry_free(entry);
-		return;
-	}
-
-	hook_entry = &hooks->hooks[i];
-
-	/* Continue traversal iff userspace said ok... */
-	if (verdict == NF_REPEAT)
-		verdict = nf_hook_entry_hookfn(hook_entry, skb, &entry->state);
-
-	if (verdict == NF_ACCEPT) {
-		if (nf_reroute(skb, entry) < 0)
-			verdict = NF_DROP;
-	}
-
-	if (verdict == NF_ACCEPT) {
-next_hook:
-		++i;
-		verdict = nf_iterate(skb, &entry->state, hooks, &i);
-	}
-
-	switch (verdict & NF_VERDICT_MASK) {
-	case NF_ACCEPT:
-	case NF_STOP:
-		local_bh_disable();
-		entry->state.okfn(entry->state.net, entry->state.sk, skb);
-		local_bh_enable();
-		break;
-	case NF_QUEUE:
-		err = nf_queue(skb, &entry->state, i, verdict);
-		if (err == 1)
-			goto next_hook;
-		break;
-	case NF_STOLEN:
-		break;
-	default:
-		kfree_skb(skb);
-	}
-
-	nf_queue_entry_free(entry);
-}
-EXPORT_SYMBOL(nf_reinject);
diff --git a/net/netfilter/nfnetlink_queue.c b/net/netfilter/nfnetlink_queue.c
@@ -225,6 +225,148 @@ find_dequeue_entry(struct nfqnl_instance *queue, unsigned int id)
 	return entry;
 }
 
+static unsigned int nf_iterate(struct sk_buff *skb,
+			       struct nf_hook_state *state,
+			       const struct nf_hook_entries *hooks,
+			       unsigned int *index)
+{
+	const struct nf_hook_entry *hook;
+	unsigned int verdict, i = *index;
+
+	while (i < hooks->num_hook_entries) {
+		hook = &hooks->hooks[i];
+repeat:
+		verdict = nf_hook_entry_hookfn(hook, skb, state);
+		if (verdict != NF_ACCEPT) {
+			*index = i;
+			if (verdict != NF_REPEAT)
+				return verdict;
+			goto repeat;
+		}
+		i++;
+	}
+
+	*index = i;
+	return NF_ACCEPT;
+}
+
+static struct nf_hook_entries *nf_hook_entries_head(const struct net *net, u8 pf, u8 hooknum)
+{
+	switch (pf) {
+#ifdef CONFIG_NETFILTER_FAMILY_BRIDGE
+	case NFPROTO_BRIDGE:
+		return rcu_dereference(net->nf.hooks_bridge[hooknum]);
+#endif
+	case NFPROTO_IPV4:
+		return rcu_dereference(net->nf.hooks_ipv4[hooknum]);
+	case NFPROTO_IPV6:
+		return rcu_dereference(net->nf.hooks_ipv6[hooknum]);
+	default:
+		WARN_ON_ONCE(1);
+		return NULL;
+	}
+
+	return NULL;
+}
+
+static int nf_ip_reroute(struct sk_buff *skb, const struct nf_queue_entry *entry)
+{
+#ifdef CONFIG_INET
+	const struct ip_rt_info *rt_info = nf_queue_entry_reroute(entry);
+
+	if (entry->state.hook == NF_INET_LOCAL_OUT) {
+		const struct iphdr *iph = ip_hdr(skb);
+
+		if (!(iph->tos == rt_info->tos &&
+		      skb->mark == rt_info->mark &&
+		      iph->daddr == rt_info->daddr &&
+		      iph->saddr == rt_info->saddr))
+			return ip_route_me_harder(entry->state.net, entry->state.sk,
+						  skb, RTN_UNSPEC);
+	}
+#endif
+	return 0;
+}
+
+static int nf_reroute(struct sk_buff *skb, struct nf_queue_entry *entry)
+{
+	const struct nf_ipv6_ops *v6ops;
+	int ret = 0;
+
+	switch (entry->state.pf) {
+	case AF_INET:
+		ret = nf_ip_reroute(skb, entry);
+		break;
+	case AF_INET6:
+		v6ops = rcu_dereference(nf_ipv6_ops);
+		if (v6ops)
+			ret = v6ops->reroute(skb, entry);
+		break;
+	}
+	return ret;
+}
+
+/* caller must hold rcu read-side lock */
+static void nf_reinject(struct nf_queue_entry *entry, unsigned int verdict)
+{
+	const struct nf_hook_entry *hook_entry;
+	const struct nf_hook_entries *hooks;
+	struct sk_buff *skb = entry->skb;
+	const struct net *net;
+	unsigned int i;
+	int err;
+	u8 pf;
+
+	net = entry->state.net;
+	pf = entry->state.pf;
+
+	hooks = nf_hook_entries_head(net, pf, entry->state.hook);
+
+	i = entry->hook_index;
+	if (WARN_ON_ONCE(!hooks || i >= hooks->num_hook_entries)) {
+		kfree_skb_reason(skb, SKB_DROP_REASON_NETFILTER_DROP);
+		nf_queue_entry_free(entry);
+		return;
+	}
+
+	hook_entry = &hooks->hooks[i];
+
+	/* Continue traversal iff userspace said ok... */
+	if (verdict == NF_REPEAT)
+		verdict = nf_hook_entry_hookfn(hook_entry, skb, &entry->state);
+
+	if (verdict == NF_ACCEPT) {
+		if (nf_reroute(skb, entry) < 0)
+			verdict = NF_DROP;
+	}
+
+	if (verdict == NF_ACCEPT) {
+next_hook:
+		++i;
+		verdict = nf_iterate(skb, &entry->state, hooks, &i);
+	}
+
+	switch (verdict & NF_VERDICT_MASK) {
+	case NF_ACCEPT:
+	case NF_STOP:
+		local_bh_disable();
+		entry->state.okfn(entry->state.net, entry->state.sk, skb);
+		local_bh_enable();
+		break;
+	case NF_QUEUE:
+		err = nf_queue(skb, &entry->state, i, verdict);
+		if (err == 1)
+			goto next_hook;
+		break;
+	case NF_STOLEN:
+		break;
+	default:
+		kfree_skb(skb);
+	}
+
+	nf_queue_entry_free(entry);
+}
+
 static void nfqnl_reinject(struct nf_queue_entry *entry, unsigned int verdict)
 {
 	const struct nf_ct_hook *ct_hook;
diff --git a/net/netfilter/utils.c b/net/netfilter/utils.c
@@ -179,43 +179,6 @@ int nf_route(struct net *net, struct dst_entry **dst, struct flowi *fl,
 }
 EXPORT_SYMBOL_GPL(nf_route);
 
-static int nf_ip_reroute(struct sk_buff *skb, const struct nf_queue_entry *entry)
-{
-#ifdef CONFIG_INET
-	const struct ip_rt_info *rt_info = nf_queue_entry_reroute(entry);
-
-	if (entry->state.hook == NF_INET_LOCAL_OUT) {
-		const struct iphdr *iph = ip_hdr(skb);
-
-		if (!(iph->tos == rt_info->tos &&
-		      skb->mark == rt_info->mark &&
-		      iph->daddr == rt_info->daddr &&
-		      iph->saddr == rt_info->saddr))
-			return ip_route_me_harder(entry->state.net, entry->state.sk,
-						  skb, RTN_UNSPEC);
-	}
-#endif
-	return 0;
-}
-
-int nf_reroute(struct sk_buff *skb, struct nf_queue_entry *entry)
-{
-	const struct nf_ipv6_ops *v6ops;
-	int ret = 0;
-
-	switch (entry->state.pf) {
-	case AF_INET:
-		ret = nf_ip_reroute(skb, entry);
-		break;
-	case AF_INET6:
-		v6ops = rcu_dereference(nf_ipv6_ops);
-		if (v6ops)
-			ret = v6ops->reroute(skb, entry);
-		break;
-	}
-	return ret;
-}
-
 /* Only get and check the lengths, not do any hop-by-hop stuff. */
 int nf_ip6_check_hbh_len(struct sk_buff *skb, u32 *plen)
 {
