OpenWrt – Rev 1
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From: Pablo Neira Ayuso <pablo@netfilter.org>
Date: Wed, 20 Dec 2017 16:12:55 +0100
Subject: [PATCH] netfilter: remove saveroute indirection in struct nf_afinfo
This is only used by nf_queue.c and this function comes with no symbol
dependencies with IPv6, it just refers to structure layouts. Therefore,
we can replace it by a direct function call from where it belongs.
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
---
--- a/include/linux/netfilter.h
+++ b/include/linux/netfilter.h
@@ -313,8 +313,6 @@ struct nf_afinfo {
unsigned short family;
int (*route)(struct net *net, struct dst_entry **dst,
struct flowi *fl, bool strict);
- void (*saveroute)(const struct sk_buff *skb,
- struct nf_queue_entry *entry);
int (*reroute)(struct net *net, struct sk_buff *skb,
const struct nf_queue_entry *entry);
int route_key_size;
--- a/include/linux/netfilter_ipv4.h
+++ b/include/linux/netfilter_ipv4.h
@@ -6,6 +6,16 @@
#include <uapi/linux/netfilter_ipv4.h>
+/* Extra routing may needed on local out, as the QUEUE target never returns
+ * control to the table.
+ */
+struct ip_rt_info {
+ __be32 daddr;
+ __be32 saddr;
+ u_int8_t tos;
+ u_int32_t mark;
+};
+
int ip_route_me_harder(struct net *net, struct sk_buff *skb, unsigned addr_type);
#ifdef CONFIG_INET
--- a/include/linux/netfilter_ipv6.h
+++ b/include/linux/netfilter_ipv6.h
@@ -9,6 +9,15 @@
#include <uapi/linux/netfilter_ipv6.h>
+/* Extra routing may needed on local out, as the QUEUE target never returns
+ * control to the table.
+ */
+struct ip6_rt_info {
+ struct in6_addr daddr;
+ struct in6_addr saddr;
+ u_int32_t mark;
+};
+
/*
* Hook functions for ipv6 to allow xt_* modules to be built-in even
* if IPv6 is a module.
--- a/net/bridge/netfilter/nf_tables_bridge.c
+++ b/net/bridge/netfilter/nf_tables_bridge.c
@@ -95,11 +95,6 @@ static const struct nf_chain_type filter
(1 << NF_BR_POST_ROUTING),
};
-static void nf_br_saveroute(const struct sk_buff *skb,
- struct nf_queue_entry *entry)
-{
-}
-
static int nf_br_reroute(struct net *net, struct sk_buff *skb,
const struct nf_queue_entry *entry)
{
@@ -115,7 +110,6 @@ static int nf_br_route(struct net *net,
static const struct nf_afinfo nf_br_afinfo = {
.family = AF_BRIDGE,
.route = nf_br_route,
- .saveroute = nf_br_saveroute,
.reroute = nf_br_reroute,
.route_key_size = 0,
};
--- a/net/ipv4/netfilter.c
+++ b/net/ipv4/netfilter.c
@@ -80,33 +80,6 @@ int ip_route_me_harder(struct net *net,
}
EXPORT_SYMBOL(ip_route_me_harder);
-/*
- * Extra routing may needed on local out, as the QUEUE target never
- * returns control to the table.
- */
-
-struct ip_rt_info {
- __be32 daddr;
- __be32 saddr;
- u_int8_t tos;
- u_int32_t mark;
-};
-
-static void nf_ip_saveroute(const struct sk_buff *skb,
- struct nf_queue_entry *entry)
-{
- 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);
-
- rt_info->tos = iph->tos;
- rt_info->daddr = iph->daddr;
- rt_info->saddr = iph->saddr;
- rt_info->mark = skb->mark;
- }
-}
-
static int nf_ip_reroute(struct net *net, struct sk_buff *skb,
const struct nf_queue_entry *entry)
{
@@ -190,7 +163,6 @@ static int nf_ip_route(struct net *net,
static const struct nf_afinfo nf_ip_afinfo = {
.family = AF_INET,
.route = nf_ip_route,
- .saveroute = nf_ip_saveroute,
.reroute = nf_ip_reroute,
.route_key_size = sizeof(struct ip_rt_info),
};
--- a/net/ipv6/netfilter.c
+++ b/net/ipv6/netfilter.c
@@ -70,31 +70,6 @@ int ip6_route_me_harder(struct net *net,
}
EXPORT_SYMBOL(ip6_route_me_harder);
-/*
- * Extra routing may needed on local out, as the QUEUE target never
- * returns control to the table.
- */
-
-struct ip6_rt_info {
- struct in6_addr daddr;
- struct in6_addr saddr;
- u_int32_t mark;
-};
-
-static void nf_ip6_saveroute(const struct sk_buff *skb,
- struct nf_queue_entry *entry)
-{
- struct ip6_rt_info *rt_info = nf_queue_entry_reroute(entry);
-
- if (entry->state.hook == NF_INET_LOCAL_OUT) {
- const struct ipv6hdr *iph = ipv6_hdr(skb);
-
- rt_info->daddr = iph->daddr;
- rt_info->saddr = iph->saddr;
- rt_info->mark = skb->mark;
- }
-}
-
static int nf_ip6_reroute(struct net *net, struct sk_buff *skb,
const struct nf_queue_entry *entry)
{
@@ -202,7 +177,6 @@ static const struct nf_ipv6_ops ipv6ops
static const struct nf_afinfo nf_ip6_afinfo = {
.family = AF_INET6,
.route = nf_ip6_route,
- .saveroute = nf_ip6_saveroute,
.reroute = nf_ip6_reroute,
.route_key_size = sizeof(struct ip6_rt_info),
};
--- a/net/netfilter/nf_queue.c
+++ b/net/netfilter/nf_queue.c
@@ -10,6 +10,8 @@
#include <linux/proc_fs.h>
#include <linux/skbuff.h>
#include <linux/netfilter.h>
+#include <linux/netfilter_ipv4.h>
+#include <linux/netfilter_ipv6.h>
#include <linux/netfilter_bridge.h>
#include <linux/seq_file.h>
#include <linux/rcupdate.h>
@@ -108,6 +110,35 @@ void nf_queue_nf_hook_drop(struct net *n
}
EXPORT_SYMBOL_GPL(nf_queue_nf_hook_drop);
+static void nf_ip_saveroute(const struct sk_buff *skb,
+ struct nf_queue_entry *entry)
+{
+ 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);
+
+ rt_info->tos = iph->tos;
+ rt_info->daddr = iph->daddr;
+ rt_info->saddr = iph->saddr;
+ rt_info->mark = skb->mark;
+ }
+}
+
+static void nf_ip6_saveroute(const struct sk_buff *skb,
+ struct nf_queue_entry *entry)
+{
+ struct ip6_rt_info *rt_info = nf_queue_entry_reroute(entry);
+
+ if (entry->state.hook == NF_INET_LOCAL_OUT) {
+ const struct ipv6hdr *iph = ipv6_hdr(skb);
+
+ rt_info->daddr = iph->daddr;
+ rt_info->saddr = iph->saddr;
+ rt_info->mark = skb->mark;
+ }
+}
+
static int __nf_queue(struct sk_buff *skb, const struct nf_hook_state *state,
const struct nf_hook_entries *entries,
unsigned int index, unsigned int queuenum)
@@ -144,7 +175,16 @@ static int __nf_queue(struct sk_buff *sk
nf_queue_entry_get_refs(entry);
skb_dst_force(skb);
- afinfo->saveroute(skb, entry);
+
+ switch (entry->state.pf) {
+ case AF_INET:
+ nf_ip_saveroute(skb, entry);
+ break;
+ case AF_INET6:
+ nf_ip6_saveroute(skb, entry);
+ break;
+ }
+
status = qh->outfn(entry, queuenum);
if (status < 0) {