You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
171 lines
5.6 KiB
171 lines
5.6 KiB
From: Pablo Neira Ayuso <pablo@netfilter.org>
|
|
Date: Mon, 27 Nov 2017 21:55:14 +0100
|
|
Subject: [PATCH] netfilter: move checksum indirection to struct nf_ipv6_ops
|
|
|
|
We cannot make a direct call to nf_ip6_checksum() because that would
|
|
result in autoloading the 'ipv6' module because of symbol dependencies.
|
|
Therefore, define checksum indirection in nf_ipv6_ops where this really
|
|
belongs to.
|
|
|
|
For IPv4, we can indeed make a direct function call, which is faster,
|
|
given IPv4 is built-in in the networking code by default. Still,
|
|
CONFIG_INET=n and CONFIG_NETFILTER=y is possible, so define empty inline
|
|
stub for IPv4 in such case.
|
|
|
|
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
|
|
---
|
|
create mode 100644 net/netfilter/utils.c
|
|
|
|
--- a/include/linux/netfilter.h
|
|
+++ b/include/linux/netfilter.h
|
|
@@ -311,8 +311,6 @@ struct nf_queue_entry;
|
|
|
|
struct nf_afinfo {
|
|
unsigned short family;
|
|
- __sum16 (*checksum)(struct sk_buff *skb, unsigned int hook,
|
|
- unsigned int dataoff, u_int8_t protocol);
|
|
__sum16 (*checksum_partial)(struct sk_buff *skb,
|
|
unsigned int hook,
|
|
unsigned int dataoff,
|
|
@@ -333,20 +331,9 @@ static inline const struct nf_afinfo *nf
|
|
return rcu_dereference(nf_afinfo[family]);
|
|
}
|
|
|
|
-static inline __sum16
|
|
-nf_checksum(struct sk_buff *skb, unsigned int hook, unsigned int dataoff,
|
|
- u_int8_t protocol, unsigned short family)
|
|
-{
|
|
- const struct nf_afinfo *afinfo;
|
|
- __sum16 csum = 0;
|
|
-
|
|
- rcu_read_lock();
|
|
- afinfo = nf_get_afinfo(family);
|
|
- if (afinfo)
|
|
- csum = afinfo->checksum(skb, hook, dataoff, protocol);
|
|
- rcu_read_unlock();
|
|
- return csum;
|
|
-}
|
|
+__sum16 nf_checksum(struct sk_buff *skb, unsigned int hook,
|
|
+ unsigned int dataoff, u_int8_t protocol,
|
|
+ unsigned short family);
|
|
|
|
static inline __sum16
|
|
nf_checksum_partial(struct sk_buff *skb, unsigned int hook,
|
|
--- a/include/linux/netfilter_ipv4.h
|
|
+++ b/include/linux/netfilter_ipv4.h
|
|
@@ -7,6 +7,16 @@
|
|
#include <uapi/linux/netfilter_ipv4.h>
|
|
|
|
int ip_route_me_harder(struct net *net, struct sk_buff *skb, unsigned addr_type);
|
|
+
|
|
+#ifdef CONFIG_INET
|
|
__sum16 nf_ip_checksum(struct sk_buff *skb, unsigned int hook,
|
|
unsigned int dataoff, u_int8_t protocol);
|
|
+#else
|
|
+static inline __sum16 nf_ip_checksum(struct sk_buff *skb, unsigned int hook,
|
|
+ unsigned int dataoff, u_int8_t protocol)
|
|
+{
|
|
+ return 0;
|
|
+}
|
|
+#endif /* CONFIG_INET */
|
|
+
|
|
#endif /*__LINUX_IP_NETFILTER_H*/
|
|
--- a/include/linux/netfilter_ipv6.h
|
|
+++ b/include/linux/netfilter_ipv6.h
|
|
@@ -19,6 +19,8 @@ struct nf_ipv6_ops {
|
|
void (*route_input)(struct sk_buff *skb);
|
|
int (*fragment)(struct net *net, struct sock *sk, struct sk_buff *skb,
|
|
int (*output)(struct net *, struct sock *, struct sk_buff *));
|
|
+ __sum16 (*checksum)(struct sk_buff *skb, unsigned int hook,
|
|
+ unsigned int dataoff, u_int8_t protocol);
|
|
};
|
|
|
|
#ifdef CONFIG_NETFILTER
|
|
--- a/net/bridge/netfilter/nf_tables_bridge.c
|
|
+++ b/net/bridge/netfilter/nf_tables_bridge.c
|
|
@@ -106,12 +106,6 @@ static int nf_br_reroute(struct net *net
|
|
return 0;
|
|
}
|
|
|
|
-static __sum16 nf_br_checksum(struct sk_buff *skb, unsigned int hook,
|
|
- unsigned int dataoff, u_int8_t protocol)
|
|
-{
|
|
- return 0;
|
|
-}
|
|
-
|
|
static __sum16 nf_br_checksum_partial(struct sk_buff *skb, unsigned int hook,
|
|
unsigned int dataoff, unsigned int len,
|
|
u_int8_t protocol)
|
|
@@ -127,7 +121,6 @@ static int nf_br_route(struct net *net,
|
|
|
|
static const struct nf_afinfo nf_br_afinfo = {
|
|
.family = AF_BRIDGE,
|
|
- .checksum = nf_br_checksum,
|
|
.checksum_partial = nf_br_checksum_partial,
|
|
.route = nf_br_route,
|
|
.saveroute = nf_br_saveroute,
|
|
--- a/net/ipv4/netfilter.c
|
|
+++ b/net/ipv4/netfilter.c
|
|
@@ -188,7 +188,6 @@ static int nf_ip_route(struct net *net,
|
|
|
|
static const struct nf_afinfo nf_ip_afinfo = {
|
|
.family = AF_INET,
|
|
- .checksum = nf_ip_checksum,
|
|
.checksum_partial = nf_ip_checksum_partial,
|
|
.route = nf_ip_route,
|
|
.saveroute = nf_ip_saveroute,
|
|
--- a/net/ipv6/netfilter.c
|
|
+++ b/net/ipv6/netfilter.c
|
|
@@ -194,12 +194,12 @@ static __sum16 nf_ip6_checksum_partial(s
|
|
static const struct nf_ipv6_ops ipv6ops = {
|
|
.chk_addr = ipv6_chk_addr,
|
|
.route_input = ip6_route_input,
|
|
- .fragment = ip6_fragment
|
|
+ .fragment = ip6_fragment,
|
|
+ .checksum = nf_ip6_checksum,
|
|
};
|
|
|
|
static const struct nf_afinfo nf_ip6_afinfo = {
|
|
.family = AF_INET6,
|
|
- .checksum = nf_ip6_checksum,
|
|
.checksum_partial = nf_ip6_checksum_partial,
|
|
.route = nf_ip6_route,
|
|
.saveroute = nf_ip6_saveroute,
|
|
--- a/net/netfilter/Makefile
|
|
+++ b/net/netfilter/Makefile
|
|
@@ -1,5 +1,5 @@
|
|
# SPDX-License-Identifier: GPL-2.0
|
|
-netfilter-objs := core.o nf_log.o nf_queue.o nf_sockopt.o
|
|
+netfilter-objs := core.o nf_log.o nf_queue.o nf_sockopt.o utils.o
|
|
|
|
nf_conntrack-y := nf_conntrack_core.o nf_conntrack_standalone.o nf_conntrack_expect.o nf_conntrack_helper.o nf_conntrack_proto.o nf_conntrack_l3proto_generic.o nf_conntrack_proto_generic.o nf_conntrack_proto_tcp.o nf_conntrack_proto_udp.o nf_conntrack_extend.o nf_conntrack_acct.o nf_conntrack_seqadj.o
|
|
nf_conntrack-$(CONFIG_NF_CONNTRACK_TIMEOUT) += nf_conntrack_timeout.o
|
|
--- /dev/null
|
|
+++ b/net/netfilter/utils.c
|
|
@@ -0,0 +1,26 @@
|
|
+#include <linux/kernel.h>
|
|
+#include <linux/netfilter.h>
|
|
+#include <linux/netfilter_ipv4.h>
|
|
+#include <linux/netfilter_ipv6.h>
|
|
+
|
|
+__sum16 nf_checksum(struct sk_buff *skb, unsigned int hook,
|
|
+ unsigned int dataoff, u_int8_t protocol,
|
|
+ unsigned short family)
|
|
+{
|
|
+ const struct nf_ipv6_ops *v6ops;
|
|
+ __sum16 csum = 0;
|
|
+
|
|
+ switch (family) {
|
|
+ case AF_INET:
|
|
+ csum = nf_ip_checksum(skb, hook, dataoff, protocol);
|
|
+ break;
|
|
+ case AF_INET6:
|
|
+ v6ops = rcu_dereference(nf_ipv6_ops);
|
|
+ if (v6ops)
|
|
+ csum = v6ops->checksum(skb, hook, dataoff, protocol);
|
|
+ break;
|
|
+ }
|
|
+
|
|
+ return csum;
|
|
+}
|
|
+EXPORT_SYMBOL_GPL(nf_checksum);
|
|
|