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netfilter: flow table support for the mixed IPv4/IPv6 family

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This patch adds the IPv6 flow table type, that implements the datapath
flow table to forward IPv6 traffic.

Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Pablo Neira Ayuso 2018-01-07 01:04:22 +01:00
parent 0995210753
commit 7c23b629a8
6 changed files with 66 additions and 2 deletions
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5
include/net/netfilter/nf_flow_table.h
View file

@ -111,6 +111,11 @@ struct flow_ports {
__be16 source, dest;
};
unsigned int nf_flow_offload_ip_hook(void *priv, struct sk_buff *skb,
const struct nf_hook_state *state);
unsigned int nf_flow_offload_ipv6_hook(void *priv, struct sk_buff *skb,
const struct nf_hook_state *state);
#define MODULE_ALIAS_NF_FLOWTABLE(family) \
MODULE_ALIAS("nf-flowtable-" __stringify(family))

3
net/ipv4/netfilter/nf_flow_table_ipv4.c
View file

@ -202,7 +202,7 @@ static bool nf_flow_exceeds_mtu(struct sk_buff *skb, const struct rtable *rt)
return false;
}
static unsigned int
unsigned int
nf_flow_offload_ip_hook(void *priv, struct sk_buff *skb,
const struct nf_hook_state *state)
{
@ -254,6 +254,7 @@ nf_flow_offload_ip_hook(void *priv, struct sk_buff *skb,
return NF_STOLEN;
}
EXPORT_SYMBOL_GPL(nf_flow_offload_ip_hook);
static struct nf_flowtable_type flowtable_ipv4 = {
.family = NFPROTO_IPV4,

3
net/ipv6/netfilter/nf_flow_table_ipv6.c
View file

@ -196,7 +196,7 @@ static bool nf_flow_exceeds_mtu(struct sk_buff *skb, const struct rt6_info *rt)
return false;
}
static unsigned int
unsigned int
nf_flow_offload_ipv6_hook(void *priv, struct sk_buff *skb,
const struct nf_hook_state *state)
{
@ -248,6 +248,7 @@ nf_flow_offload_ipv6_hook(void *priv, struct sk_buff *skb,
return NF_STOLEN;
}
EXPORT_SYMBOL_GPL(nf_flow_offload_ipv6_hook);
static struct nf_flowtable_type flowtable_ipv6 = {
.family = NFPROTO_IPV6,

8
net/netfilter/Kconfig
View file

@ -657,6 +657,14 @@ endif # NF_TABLES_NETDEV
endif # NF_TABLES
config NF_FLOW_TABLE_INET
select NF_FLOW_TABLE
tristate "Netfilter flow table mixed IPv4/IPv6 module"
help
This option adds the flow table mixed IPv4/IPv6 support.
To compile it as a module, choose M here.
config NF_FLOW_TABLE
tristate "Netfilter flow table module"
help

1
net/netfilter/Makefile
View file

@ -111,6 +111,7 @@ obj-$(CONFIG_NFT_FWD_NETDEV) += nft_fwd_netdev.o
# flow table infrastructure
obj-$(CONFIG_NF_FLOW_TABLE) += nf_flow_table.o
obj-$(CONFIG_NF_FLOW_TABLE_INET) += nf_flow_table_inet.o
# generic X tables
obj-$(CONFIG_NETFILTER_XTABLES) += x_tables.o xt_tcpudp.o

48
net/netfilter/nf_flow_table_inet.c Normal file
View file

@ -0,0 +1,48 @@
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/netfilter.h>
#include <linux/rhashtable.h>
#include <net/netfilter/nf_flow_table.h>
#include <net/netfilter/nf_tables.h>
static unsigned int
nf_flow_offload_inet_hook(void *priv, struct sk_buff *skb,
const struct nf_hook_state *state)
{
switch (skb->protocol) {
case htons(ETH_P_IP):
return nf_flow_offload_ip_hook(priv, skb, state);
case htons(ETH_P_IPV6):
return nf_flow_offload_ipv6_hook(priv, skb, state);
}
return NF_ACCEPT;
}
static struct nf_flowtable_type flowtable_inet = {
.family = NFPROTO_INET,
.params = &nf_flow_offload_rhash_params,
.gc = nf_flow_offload_work_gc,
.hook = nf_flow_offload_inet_hook,
.owner = THIS_MODULE,
};
static int __init nf_flow_inet_module_init(void)
{
nft_register_flowtable_type(&flowtable_inet);
return 0;
}
static void __exit nf_flow_inet_module_exit(void)
{
nft_unregister_flowtable_type(&flowtable_inet);
}
module_init(nf_flow_inet_module_init);
module_exit(nf_flow_inet_module_exit);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Pablo Neira Ayuso <pablo@netfilter.org>");
MODULE_ALIAS_NF_FLOWTABLE(1); /* NFPROTO_INET */