This patch converts built-in tables/chains to chain types that
allows you to deploy customized table and chain configurations from
userspace.
After this patch, you have to specify the chain type when
creating a new chain:
add chain ip filter output { type filter hook input priority 0; }
^^^^ ------
The existing chain types after this patch are: filter, route and
nat. Note that tables are just containers of chains with no specific
semantics, which is a significant change with regards to iptables.
Signed-off-by: Pablo Neira Ayuso <pablo@xxxxxxxxxxxxx>
---
include/net/netfilter/nf_tables.h | 31 ++-
include/uapi/linux/netfilter/nf_tables.h | 2 +
net/ipv4/netfilter/Kconfig | 8 +-
net/ipv4/netfilter/Makefile | 4 +-
net/ipv4/netfilter/nf_tables_ipv4.c | 21 +++
.../{nf_table_nat_ipv4.c => nft_chain_nat_ipv4.c} | 116 +++---------
...f_table_route_ipv4.c => nft_chain_route_ipv4.c} | 43 ++---
net/ipv6/netfilter/Kconfig | 4 +-
net/ipv6/netfilter/Makefile | 2 +-
net/ipv6/netfilter/nf_tables_ipv6.c | 22 ++-
...f_table_route_ipv6.c => nft_chain_route_ipv6.c} | 45 ++---
net/netfilter/nf_tables_api.c | 197 +++++++++-----------
12 files changed, 221 insertions(+), 274 deletions(-)
rename net/ipv4/netfilter/{nf_table_nat_ipv4.c => nft_chain_nat_ipv4.c} (76%)
rename net/ipv4/netfilter/{nf_table_route_ipv4.c => nft_chain_route_ipv4.c} (61%)
rename net/ipv6/netfilter/{nf_table_route_ipv6.c => nft_chain_route_ipv6.c} (65%)
diff --git a/include/net/netfilter/nf_tables.h b/include/net/netfilter/nf_tables.h
index 66d0359..8403f7f5 100644
--- a/include/net/netfilter/nf_tables.h
+++ b/include/net/netfilter/nf_tables.h
@@ -336,7 +336,6 @@ static inline struct nft_expr *nft_expr_last(const struct nft_rule *rule)
enum nft_chain_flags {
NFT_BASE_CHAIN = 0x1,
- NFT_CHAIN_BUILTIN = 0x2,
};
/**
@@ -362,14 +361,23 @@ struct nft_chain {
char name[NFT_CHAIN_MAXNAMELEN];
};
+enum nft_chain_type {
+ NFT_CHAIN_T_DEFAULT = 0,
+ NFT_CHAIN_T_ROUTE,
+ NFT_CHAIN_T_NAT,
+ NFT_CHAIN_T_MAX
+};
+
/**
* struct nft_base_chain - nf_tables base chain
*
* @ops: netfilter hook ops
+ * @type: chain type
* @chain: the chain
*/
struct nft_base_chain {
struct nf_hook_ops ops;
+ enum nft_chain_type type;
struct nft_chain chain;
};
@@ -384,10 +392,6 @@ extern unsigned int nft_do_chain(const struct nf_hook_ops *ops,
const struct net_device *out,
int (*okfn)(struct sk_buff *));
-enum nft_table_flags {
- NFT_TABLE_BUILTIN = 0x1,
-};
-
/**
* struct nft_table - nf_tables table
*
@@ -431,8 +435,17 @@ struct nft_af_info {
extern int nft_register_afinfo(struct nft_af_info *);
extern void nft_unregister_afinfo(struct nft_af_info *);
-extern int nft_register_table(struct nft_table *, int family);
-extern void nft_unregister_table(struct nft_table *, int family);
+struct nf_chain_type {
+ unsigned int hook_mask;
+ const char *name;
+ enum nft_chain_type type;
+ nf_hookfn *fn[NF_MAX_HOOKS];
+ struct module *me;
+ int family;
+};
+
+extern int nft_register_chain_type(struct nf_chain_type *);
+extern void nft_unregister_chain_type(struct nf_chain_type *);
extern int nft_register_expr(struct nft_expr_type *);
extern void nft_unregister_expr(struct nft_expr_type *);
@@ -440,8 +453,8 @@ extern void nft_unregister_expr(struct nft_expr_type *);
#define MODULE_ALIAS_NFT_FAMILY(family) \
MODULE_ALIAS("nft-afinfo-" __stringify(family))
-#define MODULE_ALIAS_NFT_TABLE(family, name) \
- MODULE_ALIAS("nft-table-" __stringify(family) "-" name)
+#define MODULE_ALIAS_NFT_CHAIN(family, name) \
+ MODULE_ALIAS("nft-chain-" __stringify(family) "-" name)
#define MODULE_ALIAS_NFT_EXPR(name) \
MODULE_ALIAS("nft-expr-" name)
diff --git a/include/uapi/linux/netfilter/nf_tables.h b/include/uapi/linux/netfilter/nf_tables.h
index 9e92401..779cf95 100644
--- a/include/uapi/linux/netfilter/nf_tables.h
+++ b/include/uapi/linux/netfilter/nf_tables.h
@@ -115,6 +115,7 @@ enum nft_table_attributes {
* @NFTA_CHAIN_HANDLE: numeric handle of the chain (NLA_U64)
* @NFTA_CHAIN_NAME: name of the chain (NLA_STRING)
* @NFTA_CHAIN_HOOK: hook specification for basechains (NLA_NESTED: nft_hook_attributes)
+ * @NFTA_CHAIN_TYPE: type name of the string (NLA_NUL_STRING)
*/
enum nft_chain_attributes {
NFTA_CHAIN_UNSPEC,
@@ -122,6 +123,7 @@ enum nft_chain_attributes {
NFTA_CHAIN_HANDLE,
NFTA_CHAIN_NAME,
NFTA_CHAIN_HOOK,
+ NFTA_CHAIN_TYPE,
__NFTA_CHAIN_MAX
};
#define NFTA_CHAIN_MAX (__NFTA_CHAIN_MAX - 1)
diff --git a/net/ipv4/netfilter/Kconfig b/net/ipv4/netfilter/Kconfig
index eb1d56e..ae65fe9 100644
--- a/net/ipv4/netfilter/Kconfig
+++ b/net/ipv4/netfilter/Kconfig
@@ -44,13 +44,13 @@ config NFT_REJECT_IPV4
depends on NF_TABLES_IPV4
tristate "nf_tables IPv4 reject support"
-config NF_TABLE_ROUTE_IPV4
+config NFT_CHAIN_ROUTE_IPV4
depends on NF_TABLES_IPV4
- tristate "IPv4 nf_tables route table support"
+ tristate "IPv4 nf_tables route chain support"
-config NF_TABLE_NAT_IPV4
+config NFT_CHAIN_NAT_IPV4
depends on NF_TABLES_IPV4
- tristate "IPv4 nf_tables nat table support"
+ tristate "IPv4 nf_tables nat chain support"
config IP_NF_IPTABLES
tristate "IP tables support (required for filtering/masq/NAT)"
diff --git a/net/ipv4/netfilter/Makefile b/net/ipv4/netfilter/Makefile
index b2f01cd..91e0bd7 100644
--- a/net/ipv4/netfilter/Makefile
+++ b/net/ipv4/netfilter/Makefile
@@ -29,8 +29,8 @@ obj-$(CONFIG_NF_NAT_PROTO_GRE) += nf_nat_proto_gre.o
obj-$(CONFIG_NF_TABLES_IPV4) += nf_tables_ipv4.o
obj-$(CONFIG_NFT_REJECT_IPV4) += nft_reject_ipv4.o
-obj-$(CONFIG_NF_TABLE_ROUTE_IPV4) += nf_table_route_ipv4.o
-obj-$(CONFIG_NF_TABLE_NAT_IPV4) += nf_table_nat_ipv4.o
+obj-$(CONFIG_NFT_CHAIN_ROUTE_IPV4) += nft_chain_route_ipv4.o
+obj-$(CONFIG_NFT_CHAIN_NAT_IPV4) += nft_chain_nat_ipv4.o
# generic IP tables
obj-$(CONFIG_IP_NF_IPTABLES) += ip_tables.o
diff --git a/net/ipv4/netfilter/nf_tables_ipv4.c b/net/ipv4/netfilter/nf_tables_ipv4.c
index 63d0a3b..23525c4 100644
--- a/net/ipv4/netfilter/nf_tables_ipv4.c
+++ b/net/ipv4/netfilter/nf_tables_ipv4.c
@@ -1,5 +1,6 @@
/*
* Copyright (c) 2008 Patrick McHardy <kaber@xxxxxxxxx>
+ * Copyright (c) 2012-2013 Pablo Neira Ayuso <pablo@xxxxxxxxxxxxx>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
@@ -41,14 +42,34 @@ static struct nft_af_info nft_af_ipv4 __read_mostly = {
},
};
+static struct nf_chain_type filter_ipv4 = {
+ .family = NFPROTO_IPV4,
+ .name = "filter",
+ .type = NFT_CHAIN_T_DEFAULT,
+ .hook_mask = (1 << NF_INET_LOCAL_IN) |
+ (1 << NF_INET_LOCAL_OUT) |
+ (1 << NF_INET_FORWARD) |
+ (1 << NF_INET_PRE_ROUTING) |
+ (1 << NF_INET_POST_ROUTING),
+ .fn = {
+ [NF_INET_LOCAL_IN] = nft_do_chain,
+ [NF_INET_LOCAL_OUT] = nft_do_chain,
+ [NF_INET_FORWARD] = nft_do_chain,
+ [NF_INET_PRE_ROUTING] = nft_do_chain,
+ [NF_INET_POST_ROUTING] = nft_do_chain,
+ },
+};
+
static int __init nf_tables_ipv4_init(void)
{
+ nft_register_chain_type(&filter_ipv4);
return nft_register_afinfo(&nft_af_ipv4);
}
static void __exit nf_tables_ipv4_exit(void)
{
nft_unregister_afinfo(&nft_af_ipv4);
+ nft_unregister_chain_type(&filter_ipv4);
}
module_init(nf_tables_ipv4_init);
diff --git a/net/ipv4/netfilter/nf_table_nat_ipv4.c b/net/ipv4/netfilter/nft_chain_nat_ipv4.c
similarity index 76%
rename from net/ipv4/netfilter/nf_table_nat_ipv4.c
rename to net/ipv4/netfilter/nft_chain_nat_ipv4.c
index 2ecce39..cd28630 100644
--- a/net/ipv4/netfilter/nf_table_nat_ipv4.c
+++ b/net/ipv4/netfilter/nft_chain_nat_ipv4.c
@@ -1,5 +1,6 @@
/*
* Copyright (c) 2008-2009 Patrick McHardy <kaber@xxxxxxxxx>
+ * Copyright (c) 2012 Pablo Neira Ayuso <pablo@xxxxxxxxxxxxx>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
@@ -167,7 +168,7 @@ static struct nft_expr_type nft_nat_type __read_mostly = {
};
/*
- * NAT table
+ * NAT chains
*/
static unsigned int nf_nat_fn(const struct nf_hook_ops *ops,
@@ -301,115 +302,52 @@ static unsigned int nf_nat_output(const struct nf_hook_ops *ops,
return ret;
}
-static struct nft_base_chain nf_chain_nat_prerouting __read_mostly = {
- .chain = {
- .name = "PREROUTING",
- .rules = LIST_HEAD_INIT(nf_chain_nat_prerouting.chain.rules),
- .flags = NFT_BASE_CHAIN | NFT_CHAIN_BUILTIN,
- },
- .ops = {
- .hook = nf_nat_prerouting,
- .owner = THIS_MODULE,
- .pf = NFPROTO_IPV4,
- .hooknum = NF_INET_PRE_ROUTING,
- .priority = NF_IP_PRI_NAT_DST,
- .priv = &nf_chain_nat_prerouting.chain,
- },
-};
-
-static struct nft_base_chain nf_chain_nat_postrouting __read_mostly = {
- .chain = {
- .name = "POSTROUTING",
- .rules = LIST_HEAD_INIT(nf_chain_nat_postrouting.chain.rules),
- .flags = NFT_BASE_CHAIN | NFT_CHAIN_BUILTIN,
- },
- .ops = {
- .hook = nf_nat_postrouting,
- .owner = THIS_MODULE,
- .pf = NFPROTO_IPV4,
- .hooknum = NF_INET_POST_ROUTING,
- .priority = NF_IP_PRI_NAT_SRC,
- .priv = &nf_chain_nat_postrouting.chain,
- },
-};
-
-static struct nft_base_chain nf_chain_nat_output __read_mostly = {
- .chain = {
- .name = "OUTPUT",
- .rules = LIST_HEAD_INIT(nf_chain_nat_output.chain.rules),
- .flags = NFT_BASE_CHAIN | NFT_CHAIN_BUILTIN,
- },
- .ops = {
- .hook = nf_nat_output,
- .owner = THIS_MODULE,
- .pf = NFPROTO_IPV4,
- .hooknum = NF_INET_LOCAL_OUT,
- .priority = NF_IP_PRI_NAT_DST,
- .priv = &nf_chain_nat_output.chain,
- },
-};
-
-static struct nft_base_chain nf_chain_nat_input __read_mostly = {
- .chain = {
- .name = "INPUT",
- .rules = LIST_HEAD_INIT(nf_chain_nat_input.chain.rules),
- .flags = NFT_BASE_CHAIN | NFT_CHAIN_BUILTIN,
- },
- .ops = {
- .hook = nf_nat_fn,
- .owner = THIS_MODULE,
- .pf = NFPROTO_IPV4,
- .hooknum = NF_INET_LOCAL_IN,
- .priority = NF_IP_PRI_NAT_SRC,
- .priv = &nf_chain_nat_input.chain,
+struct nf_chain_type nft_chain_nat_ipv4 = {
+ .family = NFPROTO_IPV4,
+ .name = "nat",
+ .type = NFT_CHAIN_T_NAT,
+ .hook_mask = (1 << NF_INET_PRE_ROUTING) |
+ (1 << NF_INET_POST_ROUTING) |
+ (1 << NF_INET_LOCAL_OUT) |
+ (1 << NF_INET_LOCAL_IN),
+ .fn = {
+ [NF_INET_PRE_ROUTING] = nf_nat_prerouting,
+ [NF_INET_POST_ROUTING] = nf_nat_postrouting,
+ [NF_INET_LOCAL_OUT] = nf_nat_output,
+ [NF_INET_LOCAL_IN] = nf_nat_fn,
},
+ .me = THIS_MODULE,
};
-
-static struct nft_table nf_table_nat_ipv4 __read_mostly = {
- .name = "nat",
- .chains = LIST_HEAD_INIT(nf_table_nat_ipv4.chains),
-};
-
-static int __init nf_table_nat_init(void)
+static int __init nft_chain_nat_init(void)
{
int err;
- list_add_tail(&nf_chain_nat_prerouting.chain.list,
- &nf_table_nat_ipv4.chains);
- list_add_tail(&nf_chain_nat_postrouting.chain.list,
- &nf_table_nat_ipv4.chains);
- list_add_tail(&nf_chain_nat_output.chain.list,
- &nf_table_nat_ipv4.chains);
- list_add_tail(&nf_chain_nat_input.chain.list,
- &nf_table_nat_ipv4.chains);
-
- err = nft_register_table(&nf_table_nat_ipv4, NFPROTO_IPV4);
+ err = nft_register_chain_type(&nft_chain_nat_ipv4);
if (err < 0)
- goto err1;
+ return err;
err = nft_register_expr(&nft_nat_type);
if (err < 0)
- goto err2;
+ goto err;
return 0;
-err2:
- nft_unregister_table(&nf_table_nat_ipv4, NFPROTO_IPV4);
-err1:
+err:
+ nft_unregister_chain_type(&nft_chain_nat_ipv4);
return err;
}
-static void __exit nf_table_nat_exit(void)
+static void __exit nft_chain_nat_exit(void)
{
nft_unregister_expr(&nft_nat_type);
- nft_unregister_table(&nf_table_nat_ipv4, AF_INET);
+ nft_unregister_chain_type(&nft_chain_nat_ipv4);
}
-module_init(nf_table_nat_init);
-module_exit(nf_table_nat_exit);
+module_init(nft_chain_nat_init);
+module_exit(nft_chain_nat_exit);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Patrick McHardy <kaber@xxxxxxxxx>");
-MODULE_ALIAS_NFT_TABLE(AF_INET, "nat");
+MODULE_ALIAS_NFT_CHAIN(AF_INET, "nat");
MODULE_ALIAS_NFT_EXPR("nat");
diff --git a/net/ipv4/netfilter/nf_table_route_ipv4.c b/net/ipv4/netfilter/nft_chain_route_ipv4.c
similarity index 61%
rename from net/ipv4/netfilter/nf_table_route_ipv4.c
rename to net/ipv4/netfilter/nft_chain_route_ipv4.c
index 4f257a1..6b84e09 100644
--- a/net/ipv4/netfilter/nf_table_route_ipv4.c
+++ b/net/ipv4/netfilter/nft_chain_route_ipv4.c
@@ -1,5 +1,6 @@
/*
* Copyright (c) 2008 Patrick McHardy <kaber@xxxxxxxxx>
+ * Copyright (c) 2012 Pablo Neira Ayuso <pablo@xxxxxxxxxxxxx>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
@@ -56,42 +57,30 @@ static unsigned int nf_route_table_hook(const struct nf_hook_ops *ops,
return ret;
}
-static struct nft_base_chain nf_chain_route_output __read_mostly = {
- .chain = {
- .name = "OUTPUT",
- .rules = LIST_HEAD_INIT(nf_chain_route_output.chain.rules),
- .flags = NFT_BASE_CHAIN | NFT_CHAIN_BUILTIN,
+static struct nf_chain_type nft_chain_route_ipv4 = {
+ .family = NFPROTO_IPV4,
+ .name = "route",
+ .type = NFT_CHAIN_T_ROUTE,
+ .hook_mask = (1 << NF_INET_LOCAL_OUT),
+ .fn = {
+ [NF_INET_LOCAL_OUT] = nf_route_table_hook,
},
- .ops = {
- .hook = nf_route_table_hook,
- .owner = THIS_MODULE,
- .pf = NFPROTO_IPV4,
- .hooknum = NF_INET_LOCAL_OUT,
- .priority = NF_IP_PRI_MANGLE,
- .priv = &nf_chain_route_output.chain,
- },
-};
-
-static struct nft_table nf_table_route_ipv4 __read_mostly = {
- .name = "route",
- .chains = LIST_HEAD_INIT(nf_table_route_ipv4.chains),
+ .me = THIS_MODULE,
};
-static int __init nf_table_route_init(void)
+static int __init nft_chain_route_init(void)
{
- list_add_tail(&nf_chain_route_output.chain.list,
- &nf_table_route_ipv4.chains);
- return nft_register_table(&nf_table_route_ipv4, NFPROTO_IPV4);
+ return nft_register_chain_type(&nft_chain_route_ipv4);
}
-static void __exit nf_table_route_exit(void)
+static void __exit nft_chain_route_exit(void)
{
- nft_unregister_table(&nf_table_route_ipv4, NFPROTO_IPV4);
+ nft_unregister_chain_type(&nft_chain_route_ipv4);
}
-module_init(nf_table_route_init);
-module_exit(nf_table_route_exit);
+module_init(nft_chain_route_init);
+module_exit(nft_chain_route_exit);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Patrick McHardy <kaber@xxxxxxxxx>");
-MODULE_ALIAS_NFT_TABLE(AF_INET, "route");
+MODULE_ALIAS_NFT_CHAIN(AF_INET, "route");
diff --git a/net/ipv6/netfilter/Kconfig b/net/ipv6/netfilter/Kconfig
index 5677e38..2383306 100644
--- a/net/ipv6/netfilter/Kconfig
+++ b/net/ipv6/netfilter/Kconfig
@@ -29,9 +29,9 @@ config NF_TABLES_IPV6
depends on NF_TABLES
tristate "IPv6 nf_tables support"
-config NF_TABLE_ROUTE_IPV6
+config NFT_CHAIN_ROUTE_IPV6
depends on NF_TABLES_IPV6
- tristate "IPv6 nf_tables route table support"
+ tristate "IPv6 nf_tables route chain support"
config IP6_NF_IPTABLES
tristate "IP6 tables support (required for filtering)"
diff --git a/net/ipv6/netfilter/Makefile b/net/ipv6/netfilter/Makefile
index 956af44..be4913a 100644
--- a/net/ipv6/netfilter/Makefile
+++ b/net/ipv6/netfilter/Makefile
@@ -25,7 +25,7 @@ obj-$(CONFIG_NF_DEFRAG_IPV6) += nf_defrag_ipv6.o
# nf_tables
obj-$(CONFIG_NF_TABLES_IPV6) += nf_tables_ipv6.o
-obj-$(CONFIG_NF_TABLE_ROUTE_IPV6) += nf_table_route_ipv6.o
+obj-$(CONFIG_NFT_CHAIN_ROUTE_IPV6) += nft_chain_route_ipv6.o
# matches
obj-$(CONFIG_IP6_NF_MATCH_AH) += ip6t_ah.o
diff --git a/net/ipv6/netfilter/nf_tables_ipv6.c b/net/ipv6/netfilter/nf_tables_ipv6.c
index e0717ce..3631d62 100644
--- a/net/ipv6/netfilter/nf_tables_ipv6.c
+++ b/net/ipv6/netfilter/nf_tables_ipv6.c
@@ -1,5 +1,6 @@
/*
* Copyright (c) 2008 Patrick McHardy <kaber@xxxxxxxxx>
+ * Copyright (c) 2012-2013 Pablo Neira Ayuso <pablo@xxxxxxxxxxxxx>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
@@ -39,14 +40,33 @@ static struct nft_af_info nft_af_ipv6 __read_mostly = {
},
};
+static struct nf_chain_type filter_ipv6 = {
+ .family = NFPROTO_IPV6,
+ .name = "filter",
+ .type = NFT_CHAIN_T_DEFAULT,
+ .hook_mask = (1 << NF_INET_LOCAL_IN) |
+ (1 << NF_INET_LOCAL_OUT) |
+ (1 << NF_INET_FORWARD) |
+ (1 << NF_INET_PRE_ROUTING) |
+ (1 << NF_INET_POST_ROUTING),
+ .fn = {
+ [NF_INET_LOCAL_IN] = nft_do_chain,
+ [NF_INET_LOCAL_OUT] = nft_do_chain,
+ [NF_INET_FORWARD] = nft_do_chain,
+ [NF_INET_PRE_ROUTING] = nft_do_chain,
+ [NF_INET_POST_ROUTING] = nft_do_chain,
+ },
+};
+
static int __init nf_tables_ipv6_init(void)
{
+ nft_register_chain_type(&filter_ipv6);
return nft_register_afinfo(&nft_af_ipv6);
}
-
static void __exit nf_tables_ipv6_exit(void)
{
nft_unregister_afinfo(&nft_af_ipv6);
+ nft_unregister_chain_type(&filter_ipv6);
}
module_init(nf_tables_ipv6_init);
diff --git a/net/ipv6/netfilter/nf_table_route_ipv6.c b/net/ipv6/netfilter/nft_chain_route_ipv6.c
similarity index 65%
rename from net/ipv6/netfilter/nf_table_route_ipv6.c
rename to net/ipv6/netfilter/nft_chain_route_ipv6.c
index 48ac65c..4cdc992 100644
--- a/net/ipv6/netfilter/nf_table_route_ipv6.c
+++ b/net/ipv6/netfilter/nft_chain_route_ipv6.c
@@ -1,5 +1,6 @@
/*
* Copyright (c) 2008 Patrick McHardy <kaber@xxxxxxxxx>
+ * Copyright (c) 2012 Pablo Neira Ayuso <pablo@xxxxxxxxxxxxx>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
@@ -52,42 +53,30 @@ static unsigned int nf_route_table_hook(const struct nf_hook_ops *ops,
return ret;
}
-static struct nft_base_chain nf_chain_route_output __read_mostly = {
- .chain = {
- .name = "OUTPUT",
- .rules = LIST_HEAD_INIT(nf_chain_route_output.chain.rules),
- .flags = NFT_BASE_CHAIN | NFT_CHAIN_BUILTIN,
- },
- .ops = {
- .hook = nf_route_table_hook,
- .owner = THIS_MODULE,
- .pf = NFPROTO_IPV6,
- .hooknum = NF_INET_LOCAL_OUT,
- .priority = NF_IP6_PRI_MANGLE,
- .priv = &nf_chain_route_output.chain,
- },
+static struct nf_chain_type nft_chain_route_ipv6 = {
+ .family = NFPROTO_IPV6,
+ .name = "route",
+ .type = NFT_CHAIN_T_ROUTE,
+ .hook_mask = (1 << NF_INET_LOCAL_OUT),
+ .fn = {
+ [NF_INET_LOCAL_OUT] = nf_route_table_hook,
+ },
+ .me = THIS_MODULE,
};
-static struct nft_table nf_table_route_ipv6 __read_mostly = {
- .name = "route",
- .chains = LIST_HEAD_INIT(nf_table_route_ipv6.chains),
-};
-
-static int __init nf_table_route_init(void)
+static int __init nft_chain_route_init(void)
{
- list_add_tail(&nf_chain_route_output.chain.list,
- &nf_table_route_ipv6.chains);
- return nft_register_table(&nf_table_route_ipv6, NFPROTO_IPV6);
+ return nft_register_chain_type(&nft_chain_route_ipv6);
}
-static void __exit nf_table_route_exit(void)
+static void __exit nft_chain_route_exit(void)
{
- nft_unregister_table(&nf_table_route_ipv6, NFPROTO_IPV6);
+ nft_unregister_chain_type(&nft_chain_route_ipv6);
}
-module_init(nf_table_route_init);
-module_exit(nf_table_route_exit);
+module_init(nft_chain_route_init);
+module_exit(nft_chain_route_exit);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Patrick McHardy <kaber@xxxxxxxxx>");
-MODULE_ALIAS_NFT_TABLE(AF_INET6, "route");
+MODULE_ALIAS_NFT_CHAIN(AF_INET6, "route");
diff --git a/net/netfilter/nf_tables_api.c b/net/netfilter/nf_tables_api.c
index 6dac9a3..9c2d8d5 100644
--- a/net/netfilter/nf_tables_api.c
+++ b/net/netfilter/nf_tables_api.c
@@ -104,8 +104,7 @@ static struct nft_table *nft_table_lookup(const struct nft_af_info *afi,
}
static struct nft_table *nf_tables_table_lookup(const struct nft_af_info *afi,
- const struct nlattr *nla,
- bool autoload)
+ const struct nlattr *nla)
{
struct nft_table *table;
@@ -116,16 +115,6 @@ static struct nft_table *nf_tables_table_lookup(const struct nft_af_info *afi,
if (table != NULL)
return table;
-#ifdef CONFIG_MODULES
- if (autoload) {
- nfnl_unlock(NFNL_SUBSYS_NFTABLES);
- request_module("nft-table-%u-%*.s", afi->family,
- nla_len(nla)-1, (const char *)nla_data(nla));
- nfnl_lock(NFNL_SUBSYS_NFTABLES);
- if (nft_table_lookup(afi, nla))
- return ERR_PTR(-EAGAIN);
- }
-#endif
return ERR_PTR(-ENOENT);
}
@@ -134,6 +123,39 @@ static inline u64 nf_tables_alloc_handle(struct nft_table *table)
return ++table->hgenerator;
}
+static struct nf_chain_type *chain_type[AF_MAX][NFT_CHAIN_T_MAX];
+
+static int __nf_tables_chain_type_lookup(int family, const struct nlattr *nla)
+{
+ int i;
+
+ for (i=0; i<NFT_CHAIN_T_MAX; i++) {
+ if (chain_type[family][i] != NULL &&
+ !nla_strcmp(nla, chain_type[family][i]->name))
+ return i;
+ }
+ return -1;
+}
+
+static int nf_tables_chain_type_lookup(const struct nft_af_info *afi,
+ const struct nlattr *nla,
+ bool autoload)
+{
+ int type;
+
+ type = __nf_tables_chain_type_lookup(afi->family, nla);
+#ifdef CONFIG_MODULES
+ if (type < 0 && autoload) {
+ nfnl_unlock(NFNL_SUBSYS_NFTABLES);
+ request_module("nft-chain-%u-%*.s", afi->family,
+ nla_len(nla)-1, (const char *)nla_data(nla));
+ nfnl_lock(NFNL_SUBSYS_NFTABLES);
+ type = __nf_tables_chain_type_lookup(afi->family, nla);
+ }
+#endif
+ return type;
+}
+
static const struct nla_policy nft_table_policy[NFTA_TABLE_MAX + 1] = {
[NFTA_TABLE_NAME] = { .type = NLA_STRING },
};
@@ -258,7 +280,7 @@ static int nf_tables_gettable(struct sock *nlsk, struct sk_buff *skb,
if (IS_ERR(afi))
return PTR_ERR(afi);
- table = nf_tables_table_lookup(afi, nla[NFTA_TABLE_NAME], false);
+ table = nf_tables_table_lookup(afi, nla[NFTA_TABLE_NAME]);
if (IS_ERR(table))
return PTR_ERR(table);
@@ -294,7 +316,7 @@ static int nf_tables_newtable(struct sock *nlsk, struct sk_buff *skb,
return PTR_ERR(afi);
name = nla[NFTA_TABLE_NAME];
- table = nf_tables_table_lookup(afi, name, false);
+ table = nf_tables_table_lookup(afi, name);
if (IS_ERR(table)) {
if (PTR_ERR(table) != -ENOENT)
return PTR_ERR(table);
@@ -335,13 +357,10 @@ static int nf_tables_deltable(struct sock *nlsk, struct sk_buff *skb,
if (IS_ERR(afi))
return PTR_ERR(afi);
- table = nf_tables_table_lookup(afi, nla[NFTA_TABLE_NAME], false);
+ table = nf_tables_table_lookup(afi, nla[NFTA_TABLE_NAME]);
if (IS_ERR(table))
return PTR_ERR(table);
- if (table->flags & NFT_TABLE_BUILTIN)
- return -EOPNOTSUPP;
-
if (table->use)
return -EBUSY;
@@ -351,99 +370,34 @@ static int nf_tables_deltable(struct sock *nlsk, struct sk_buff *skb,
return 0;
}
-static struct nft_table *__nf_tables_table_lookup(const struct nft_af_info *afi,
- const char *name)
+int nft_register_chain_type(struct nf_chain_type *ctype)
{
- struct nft_table *table;
-
- list_for_each_entry(table, &afi->tables, list) {
- if (!strcmp(name, table->name))
- return table;
- }
-
- return ERR_PTR(-ENOENT);
-}
-
-static int nf_tables_chain_notify(const struct sk_buff *oskb,
- const struct nlmsghdr *nlh,
- const struct nft_table *table,
- const struct nft_chain *chain,
- int event, int family);
-
-/**
- * nft_register_table - register a built-in table
- *
- * @table: the table to register
- * @family: protocol family to register table with
- *
- * Register a built-in table for use with nf_tables. Returns zero on
- * success or a negative errno code otherwise.
- */
-int nft_register_table(struct nft_table *table, int family)
-{
- struct nft_af_info *afi;
- struct nft_table *t;
- struct nft_chain *chain;
- int err;
+ int err = 0;
nfnl_lock(NFNL_SUBSYS_NFTABLES);
-again:
- afi = nf_tables_afinfo_lookup(family, true);
- if (IS_ERR(afi)) {
- err = PTR_ERR(afi);
- if (err == -EAGAIN)
- goto again;
- goto err;
- }
-
- t = __nf_tables_table_lookup(afi, table->name);
- if (IS_ERR(t)) {
- err = PTR_ERR(t);
- if (err != -ENOENT)
- goto err;
- t = NULL;
+ if (chain_type[ctype->family][ctype->type] != NULL) {
+ err = -EBUSY;
+ goto out;
}
- if (t != NULL) {
- err = -EEXIST;
- goto err;
- }
+ if (!try_module_get(ctype->me))
+ goto out;
- table->flags |= NFT_TABLE_BUILTIN;
- INIT_LIST_HEAD(&table->sets);
- list_add_tail(&table->list, &afi->tables);
- nf_tables_table_notify(NULL, NULL, table, NFT_MSG_NEWTABLE, family);
- list_for_each_entry(chain, &table->chains, list)
- nf_tables_chain_notify(NULL, NULL, table, chain,
- NFT_MSG_NEWCHAIN, family);
- err = 0;
-err:
+ chain_type[ctype->family][ctype->type] = ctype;
+out:
nfnl_unlock(NFNL_SUBSYS_NFTABLES);
return err;
}
-EXPORT_SYMBOL_GPL(nft_register_table);
+EXPORT_SYMBOL_GPL(nft_register_chain_type);
-/**
- * nft_unregister_table - unregister a built-in table
- *
- * @table: the table to unregister
- * @family: protocol family to unregister table with
- *
- * Unregister a built-in table for use with nf_tables.
- */
-void nft_unregister_table(struct nft_table *table, int family)
+void nft_unregister_chain_type(struct nf_chain_type *ctype)
{
- struct nft_chain *chain;
-
nfnl_lock(NFNL_SUBSYS_NFTABLES);
- list_del(&table->list);
- list_for_each_entry(chain, &table->chains, list)
- nf_tables_chain_notify(NULL, NULL, table, chain,
- NFT_MSG_DELCHAIN, family);
- nf_tables_table_notify(NULL, NULL, table, NFT_MSG_DELTABLE, family);
+ chain_type[ctype->family][ctype->type] = NULL;
+ module_put(ctype->me);
nfnl_unlock(NFNL_SUBSYS_NFTABLES);
}
-EXPORT_SYMBOL_GPL(nft_unregister_table);
+EXPORT_SYMBOL_GPL(nft_unregister_chain_type);
/*
* Chains
@@ -484,6 +438,7 @@ static const struct nla_policy nft_chain_policy[NFTA_CHAIN_MAX + 1] = {
[NFTA_CHAIN_NAME] = { .type = NLA_STRING,
.len = NFT_CHAIN_MAXNAMELEN - 1 },
[NFTA_CHAIN_HOOK] = { .type = NLA_NESTED },
+ [NFTA_CHAIN_TYPE] = { .type = NLA_NUL_STRING },
};
static const struct nla_policy nft_hook_policy[NFTA_HOOK_MAX + 1] = {
@@ -526,6 +481,10 @@ static int nf_tables_fill_chain_info(struct sk_buff *skb, u32 portid, u32 seq,
if (nla_put_be32(skb, NFTA_HOOK_PRIORITY, htonl(ops->priority)))
goto nla_put_failure;
nla_nest_end(skb, nest);
+
+ if (nla_put_string(skb, NFTA_CHAIN_TYPE,
+ chain_type[ops->pf][nft_base_chain(chain)->type]->name))
+ goto nla_put_failure;
}
return nlmsg_end(skb, nlh);
@@ -633,7 +592,7 @@ static int nf_tables_getchain(struct sock *nlsk, struct sk_buff *skb,
if (IS_ERR(afi))
return PTR_ERR(afi);
- table = nf_tables_table_lookup(afi, nla[NFTA_CHAIN_TABLE], false);
+ table = nf_tables_table_lookup(afi, nla[NFTA_CHAIN_TABLE]);
if (IS_ERR(table))
return PTR_ERR(table);
@@ -680,7 +639,7 @@ static int nf_tables_newchain(struct sock *nlsk, struct sk_buff *skb,
if (IS_ERR(afi))
return PTR_ERR(afi);
- table = nf_tables_table_lookup(afi, nla[NFTA_CHAIN_TABLE], create);
+ table = nf_tables_table_lookup(afi, nla[NFTA_CHAIN_TABLE]);
if (IS_ERR(table))
return PTR_ERR(table);
@@ -722,6 +681,17 @@ static int nf_tables_newchain(struct sock *nlsk, struct sk_buff *skb,
if (nla[NFTA_CHAIN_HOOK]) {
struct nf_hook_ops *ops;
+ nf_hookfn *hookfn;
+ u32 hooknum;
+ int type = NFT_CHAIN_T_DEFAULT;
+
+ if (nla[NFTA_CHAIN_TYPE]) {
+ type = nf_tables_chain_type_lookup(afi,
+ nla[NFTA_CHAIN_TYPE],
+ create);
+ if (type < 0)
+ return -ENOENT;
+ }
err = nla_parse_nested(ha, NFTA_HOOK_MAX, nla[NFTA_CHAIN_HOOK],
nft_hook_policy);
@@ -730,12 +700,20 @@ static int nf_tables_newchain(struct sock *nlsk, struct sk_buff *skb,
if (ha[NFTA_HOOK_HOOKNUM] == NULL ||
ha[NFTA_HOOK_PRIORITY] == NULL)
return -EINVAL;
- if (ntohl(nla_get_be32(ha[NFTA_HOOK_HOOKNUM])) >= afi->nhooks)
+
+ hooknum = ntohl(nla_get_be32(ha[NFTA_HOOK_HOOKNUM]));
+ if (hooknum >= afi->nhooks)
return -EINVAL;
+ hookfn = chain_type[family][type]->fn[hooknum];
+ if (hookfn == NULL)
+ return -EOPNOTSUPP;
+
basechain = kzalloc(sizeof(*basechain), GFP_KERNEL);
if (basechain == NULL)
return -ENOMEM;
+
+ basechain->type = type;
chain = &basechain->chain;
ops = &basechain->ops;
@@ -744,7 +722,7 @@ static int nf_tables_newchain(struct sock *nlsk, struct sk_buff *skb,
ops->hooknum = ntohl(nla_get_be32(ha[NFTA_HOOK_HOOKNUM]));
ops->priority = ntohl(nla_get_be32(ha[NFTA_HOOK_PRIORITY]));
ops->priv = chain;
- ops->hook = nft_do_chain;
+ ops->hook = hookfn;
if (afi->hooks[ops->hooknum])
ops->hook = afi->hooks[ops->hooknum];
@@ -793,7 +771,7 @@ static int nf_tables_delchain(struct sock *nlsk, struct sk_buff *skb,
if (IS_ERR(afi))
return PTR_ERR(afi);
- table = nf_tables_table_lookup(afi, nla[NFTA_CHAIN_TABLE], false);
+ table = nf_tables_table_lookup(afi, nla[NFTA_CHAIN_TABLE]);
if (IS_ERR(table))
return PTR_ERR(table);
@@ -801,9 +779,6 @@ static int nf_tables_delchain(struct sock *nlsk, struct sk_buff *skb,
if (IS_ERR(chain))
return PTR_ERR(chain);
- if (chain->flags & NFT_CHAIN_BUILTIN)
- return -EOPNOTSUPP;
-
if (!list_empty(&chain->rules))
return -EBUSY;
@@ -1190,7 +1165,7 @@ static int nf_tables_getrule(struct sock *nlsk, struct sk_buff *skb,
if (IS_ERR(afi))
return PTR_ERR(afi);
- table = nf_tables_table_lookup(afi, nla[NFTA_RULE_TABLE], false);
+ table = nf_tables_table_lookup(afi, nla[NFTA_RULE_TABLE]);
if (IS_ERR(table))
return PTR_ERR(table);
@@ -1268,7 +1243,7 @@ static int nf_tables_newrule(struct sock *nlsk, struct sk_buff *skb,
if (IS_ERR(afi))
return PTR_ERR(afi);
- table = nf_tables_table_lookup(afi, nla[NFTA_RULE_TABLE], create);
+ table = nf_tables_table_lookup(afi, nla[NFTA_RULE_TABLE]);
if (IS_ERR(table))
return PTR_ERR(table);
@@ -1374,7 +1349,7 @@ static int nf_tables_delrule(struct sock *nlsk, struct sk_buff *skb,
if (IS_ERR(afi))
return PTR_ERR(afi);
- table = nf_tables_table_lookup(afi, nla[NFTA_RULE_TABLE], false);
+ table = nf_tables_table_lookup(afi, nla[NFTA_RULE_TABLE]);
if (IS_ERR(table))
return PTR_ERR(table);
@@ -1490,7 +1465,7 @@ static int nft_ctx_init_from_setattr(struct nft_ctx *ctx,
return PTR_ERR(afi);
if (nla[NFTA_SET_TABLE] != NULL) {
- table = nf_tables_table_lookup(afi, nla[NFTA_SET_TABLE], false);
+ table = nf_tables_table_lookup(afi, nla[NFTA_SET_TABLE]);
if (IS_ERR(table))
return PTR_ERR(table);
}
@@ -1820,7 +1795,7 @@ static int nf_tables_newset(struct sock *nlsk, struct sk_buff *skb,
if (IS_ERR(afi))
return PTR_ERR(afi);
- table = nf_tables_table_lookup(afi, nla[NFTA_SET_TABLE], create);
+ table = nf_tables_table_lookup(afi, nla[NFTA_SET_TABLE]);
if (IS_ERR(table))
return PTR_ERR(table);
@@ -2008,7 +1983,7 @@ static int nft_ctx_init_from_elemattr(struct nft_ctx *ctx,
if (IS_ERR(afi))
return PTR_ERR(afi);
- table = nf_tables_table_lookup(afi, nla[NFTA_SET_ELEM_LIST_TABLE], false);
+ table = nf_tables_table_lookup(afi, nla[NFTA_SET_ELEM_LIST_TABLE]);
if (IS_ERR(table))
return PTR_ERR(table);
--
1.7.10.4
--
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