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netfilter: nf_tables: make chain types override the default AF functions 

Currently the AF-specific hook functions override the chain-type specific
hook functions. That doesn't make too much sense since the chain types
are a special case of the AF-specific hooks.

Make the AF-specific hook functions the default and make the optional
chain type hooks override them.

As a side effect, the necessary code restructuring reduces the code size,
f.i. in case of nf_tables_ipv4.o:

  nf_tables_ipv4_init_net   |  -24
  nft_do_chain_ipv4         | -113
 2 functions changed, 137 bytes removed, diff: -137

Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Patrick McHardy 2014-01-03 12:16:13 +00:00 коммит произвёл Pablo Neira Ayuso
Родитель 688d18636f
Коммит 3b088c4bc0
5 изменённых файлов: 81 добавлений и 96 удалений
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38
net/bridge/netfilter/nf_tables_bridge.c
Просмотреть файл

@ -14,10 +14,29 @@
#include <linux/netfilter_bridge.h>
#include <net/netfilter/nf_tables.h>
static unsigned int
nft_do_chain_bridge(const struct nf_hook_ops *ops,
struct sk_buff *skb,
const struct net_device *in,
const struct net_device *out,
int (*okfn)(struct sk_buff *))
{
struct nft_pktinfo pkt;
nft_set_pktinfo(&pkt, ops, skb, in, out);
return nft_do_chain_pktinfo(&pkt, ops);
}
static struct nft_af_info nft_af_bridge __read_mostly = {
.family = NFPROTO_BRIDGE,
.nhooks = NF_BR_NUMHOOKS,
.owner = THIS_MODULE,
.hooks = {
[NF_BR_LOCAL_IN] = nft_do_chain_bridge,
[NF_BR_FORWARD] = nft_do_chain_bridge,
[NF_BR_LOCAL_OUT] = nft_do_chain_bridge,
},
};
static int nf_tables_bridge_init_net(struct net *net)
@ -48,20 +67,6 @@ static struct pernet_operations nf_tables_bridge_net_ops = {
.exit = nf_tables_bridge_exit_net,
};
static unsigned int
nft_do_chain_bridge(const struct nf_hook_ops *ops,
struct sk_buff *skb,
const struct net_device *in,
const struct net_device *out,
int (*okfn)(struct sk_buff *))
{
struct nft_pktinfo pkt;
nft_set_pktinfo(&pkt, ops, skb, in, out);
return nft_do_chain_pktinfo(&pkt, ops);
}
static struct nf_chain_type filter_bridge = {
.family = NFPROTO_BRIDGE,
.name = "filter",
@ -69,11 +74,6 @@ static struct nf_chain_type filter_bridge = {
.hook_mask = (1 << NF_BR_LOCAL_IN) |
(1 << NF_BR_FORWARD) |
(1 << NF_BR_LOCAL_OUT),
.fn = {
[NF_BR_LOCAL_IN] = nft_do_chain_bridge,
[NF_BR_FORWARD] = nft_do_chain_bridge,
[NF_BR_LOCAL_OUT] = nft_do_chain_bridge,
},
};
static int __init nf_tables_bridge_init(void)

38
net/ipv4/netfilter/nf_tables_arp.c
Просмотреть файл

@ -14,10 +14,29 @@
#include <linux/netfilter_arp.h>
#include <net/netfilter/nf_tables.h>
static unsigned int
nft_do_chain_arp(const struct nf_hook_ops *ops,
struct sk_buff *skb,
const struct net_device *in,
const struct net_device *out,
int (*okfn)(struct sk_buff *))
{
struct nft_pktinfo pkt;
nft_set_pktinfo(&pkt, ops, skb, in, out);
return nft_do_chain_pktinfo(&pkt, ops);
}
static struct nft_af_info nft_af_arp __read_mostly = {
.family = NFPROTO_ARP,
.nhooks = NF_ARP_NUMHOOKS,
.owner = THIS_MODULE,
.hooks = {
[NF_ARP_IN] = nft_do_chain_arp,
[NF_ARP_OUT] = nft_do_chain_arp,
[NF_ARP_FORWARD] = nft_do_chain_arp,
},
};
static int nf_tables_arp_init_net(struct net *net)
@ -48,20 +67,6 @@ static struct pernet_operations nf_tables_arp_net_ops = {
.exit = nf_tables_arp_exit_net,
};
static unsigned int
nft_do_chain_arp(const struct nf_hook_ops *ops,
struct sk_buff *skb,
const struct net_device *in,
const struct net_device *out,
int (*okfn)(struct sk_buff *))
{
struct nft_pktinfo pkt;
nft_set_pktinfo(&pkt, ops, skb, in, out);
return nft_do_chain_pktinfo(&pkt, ops);
}
static struct nf_chain_type filter_arp = {
.family = NFPROTO_ARP,
.name = "filter",
@ -69,11 +74,6 @@ static struct nf_chain_type filter_arp = {
.hook_mask = (1 << NF_ARP_IN) |
(1 << NF_ARP_OUT) |
(1 << NF_ARP_FORWARD),
.fn = {
[NF_ARP_IN] = nft_do_chain_arp,
[NF_ARP_OUT] = nft_do_chain_arp,
[NF_ARP_FORWARD] = nft_do_chain_arp,
},
};
static int __init nf_tables_arp_init(void)

41
net/ipv4/netfilter/nf_tables_ipv4.c
Просмотреть файл

@ -18,7 +18,7 @@
#include <net/ip.h>
#include <net/netfilter/nf_tables_ipv4.h>
static unsigned int nft_ipv4_output(const struct nf_hook_ops *ops,
static unsigned int nft_do_chain_ipv4(const struct nf_hook_ops *ops,
struct sk_buff *skb,
const struct net_device *in,
const struct net_device *out,
@ -26,6 +26,17 @@ static unsigned int nft_ipv4_output(const struct nf_hook_ops *ops,
{
struct nft_pktinfo pkt;
nft_set_pktinfo_ipv4(&pkt, ops, skb, in, out);
return nft_do_chain_pktinfo(&pkt, ops);
}
static unsigned int nft_ipv4_output(const struct nf_hook_ops *ops,
struct sk_buff *skb,
const struct net_device *in,
const struct net_device *out,
int (*okfn)(struct sk_buff *))
{
if (unlikely(skb->len < sizeof(struct iphdr) ||
ip_hdr(skb)->ihl < sizeof(struct iphdr) / 4)) {
if (net_ratelimit())
@ -33,9 +44,8 @@ static unsigned int nft_ipv4_output(const struct nf_hook_ops *ops,
"packet\n");
return NF_ACCEPT;
}
nft_set_pktinfo_ipv4(&pkt, ops, skb, in, out);
return nft_do_chain_pktinfo(&pkt, ops);
return nft_do_chain_ipv4(ops, skb, in, out, okfn);
}
static struct nft_af_info nft_af_ipv4 __read_mostly = {
@ -43,7 +53,11 @@ static struct nft_af_info nft_af_ipv4 __read_mostly = {
.nhooks = NF_INET_NUMHOOKS,
.owner = THIS_MODULE,
.hooks = {
[NF_INET_LOCAL_IN] = nft_do_chain_ipv4,
[NF_INET_LOCAL_OUT] = nft_ipv4_output,
[NF_INET_FORWARD] = nft_do_chain_ipv4,
[NF_INET_PRE_ROUTING] = nft_do_chain_ipv4,
[NF_INET_POST_ROUTING] = nft_do_chain_ipv4,
},
};
@ -75,20 +89,6 @@ static struct pernet_operations nf_tables_ipv4_net_ops = {
.exit = nf_tables_ipv4_exit_net,
};
static unsigned int
nft_do_chain_ipv4(const struct nf_hook_ops *ops,
struct sk_buff *skb,
const struct net_device *in,
const struct net_device *out,
int (*okfn)(struct sk_buff *))
{
struct nft_pktinfo pkt;
nft_set_pktinfo_ipv4(&pkt, ops, skb, in, out);
return nft_do_chain_pktinfo(&pkt, ops);
}
static struct nf_chain_type filter_ipv4 = {
.family = NFPROTO_IPV4,
.name = "filter",
@ -98,13 +98,6 @@ static struct nf_chain_type filter_ipv4 = {
(1 << NF_INET_FORWARD) |
(1 << NF_INET_PRE_ROUTING) |
(1 << NF_INET_POST_ROUTING),
.fn = {
[NF_INET_LOCAL_IN] = nft_do_chain_ipv4,
[NF_INET_LOCAL_OUT] = nft_ipv4_output,
[NF_INET_FORWARD] = nft_do_chain_ipv4,
[NF_INET_PRE_ROUTING] = nft_do_chain_ipv4,
[NF_INET_POST_ROUTING] = nft_do_chain_ipv4,
},
};
static int __init nf_tables_ipv4_init(void)

46
net/ipv6/netfilter/nf_tables_ipv6.c
Просмотреть файл

@ -16,7 +16,7 @@
#include <net/netfilter/nf_tables.h>
#include <net/netfilter/nf_tables_ipv6.h>
static unsigned int nft_ipv6_output(const struct nf_hook_ops *ops,
static unsigned int nft_do_chain_ipv6(const struct nf_hook_ops *ops,
struct sk_buff *skb,
const struct net_device *in,
const struct net_device *out,
@ -24,16 +24,27 @@ static unsigned int nft_ipv6_output(const struct nf_hook_ops *ops,
{
struct nft_pktinfo pkt;
/* malformed packet, drop it */
if (nft_set_pktinfo_ipv6(&pkt, ops, skb, in, out) < 0)
return NF_DROP;
return nft_do_chain_pktinfo(&pkt, ops);
}
static unsigned int nft_ipv6_output(const struct nf_hook_ops *ops,
struct sk_buff *skb,
const struct net_device *in,
const struct net_device *out,
int (*okfn)(struct sk_buff *))
{
if (unlikely(skb->len < sizeof(struct ipv6hdr))) {
if (net_ratelimit())
pr_info("nf_tables_ipv6: ignoring short SOCK_RAW "
"packet\n");
return NF_ACCEPT;
}
if (nft_set_pktinfo_ipv6(&pkt, ops, skb, in, out) < 0)
return NF_DROP;
return nft_do_chain_pktinfo(&pkt, ops);
return nft_do_chain_ipv6(ops, skb, in, out, okfn);
}
static struct nft_af_info nft_af_ipv6 __read_mostly = {
@ -41,7 +52,11 @@ static struct nft_af_info nft_af_ipv6 __read_mostly = {
.nhooks = NF_INET_NUMHOOKS,
.owner = THIS_MODULE,
.hooks = {
[NF_INET_LOCAL_IN] = nft_do_chain_ipv6,
[NF_INET_LOCAL_OUT] = nft_ipv6_output,
[NF_INET_FORWARD] = nft_do_chain_ipv6,
[NF_INET_PRE_ROUTING] = nft_do_chain_ipv6,
[NF_INET_POST_ROUTING] = nft_do_chain_ipv6,
},
};
@ -73,22 +88,6 @@ static struct pernet_operations nf_tables_ipv6_net_ops = {
.exit = nf_tables_ipv6_exit_net,
};
static unsigned int
nft_do_chain_ipv6(const struct nf_hook_ops *ops,
struct sk_buff *skb,
const struct net_device *in,
const struct net_device *out,
int (*okfn)(struct sk_buff *))
{
struct nft_pktinfo pkt;
/* malformed packet, drop it */
if (nft_set_pktinfo_ipv6(&pkt, ops, skb, in, out) < 0)
return NF_DROP;
return nft_do_chain_pktinfo(&pkt, ops);
}
static struct nf_chain_type filter_ipv6 = {
.family = NFPROTO_IPV6,
.name = "filter",
@ -98,13 +97,6 @@ static struct nf_chain_type filter_ipv6 = {
(1 << NF_INET_FORWARD) |
(1 << NF_INET_PRE_ROUTING) |
(1 << NF_INET_POST_ROUTING),
.fn = {
[NF_INET_LOCAL_IN] = nft_do_chain_ipv6,
[NF_INET_LOCAL_OUT] = nft_ipv6_output,
[NF_INET_FORWARD] = nft_do_chain_ipv6,
[NF_INET_PRE_ROUTING] = nft_do_chain_ipv6,
[NF_INET_POST_ROUTING] = nft_do_chain_ipv6,
},
};
static int __init nf_tables_ipv6_init(void)

8
net/netfilter/nf_tables_api.c
Просмотреть файл

@ -927,9 +927,9 @@ static int nf_tables_newchain(struct sock *nlsk, struct sk_buff *skb,
if (hooknum >= afi->nhooks)
return -EINVAL;
hookfn = chain_type[family][type]->fn[hooknum];
if (hookfn == NULL)
if (!(chain_type[family][type]->hook_mask & (1 << hooknum)))
return -EOPNOTSUPP;
hookfn = chain_type[family][type]->fn[hooknum];
basechain = kzalloc(sizeof(*basechain), GFP_KERNEL);
if (basechain == NULL)
@ -944,9 +944,9 @@ 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 = hookfn;
if (afi->hooks[ops->hooknum])
ops->hook = afi->hooks[ops->hooknum];
if (hookfn)
ops->hook = hookfn;
chain->flags |= NFT_BASE_CHAIN;