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netfilter: xtables: use xt_table for hook instantiation 

The respective xt_table structures already have most of the metadata
needed for hook setup. Add a 'priority' field to struct xt_table so
that xt_hook_link() can be called with a reduced number of arguments.

So should we be having more tables in the future, it comes at no
static cost (only runtime, as before) - space saved:
6807373->6806555.

Signed-off-by: Jan Engelhardt <jengelh@medozas.de>
This commit is contained in:
Jan Engelhardt 2009-06-17 13:57:48 +02:00
parent 2b21e05147
commit 2b95efe7f6
11 changed files with 121 additions and 250 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
include/linux/netfilter/x_tables.h
View File

@ -361,6 +361,7 @@ struct xt_table {
struct module *me;
u_int8_t af; /* address/protocol family */
int priority; /* hook order */
/* A unique name... */
const char name[XT_TABLE_MAXNAMELEN];
@ -522,6 +523,9 @@ static inline unsigned long ifname_compare_aligned(const char *_a,
return ret;
}
extern struct nf_hook_ops *xt_hook_link(const struct xt_table *, nf_hookfn *);
extern void xt_hook_unlink(const struct xt_table *, struct nf_hook_ops *);
#ifdef CONFIG_COMPAT
#include <net/compat.h>

33
net/ipv4/netfilter/arptable_filter.c
View File

@ -50,6 +50,7 @@ static const struct xt_table packet_filter = {
.valid_hooks = FILTER_VALID_HOOKS,
.me = THIS_MODULE,
.af = NFPROTO_ARP,
.priority = NF_IP_PRI_FILTER,
};
/* The work comes in here from netfilter.c */
@ -63,29 +64,7 @@ arptable_filter_hook(unsigned int hook, struct sk_buff *skb,
return arpt_do_table(skb, hook, in, out, net->ipv4.arptable_filter);
}
static struct nf_hook_ops arpt_ops[] __read_mostly = {
{
.hook = arptable_filter_hook,
.owner = THIS_MODULE,
.pf = NFPROTO_ARP,
.hooknum = NF_ARP_IN,
.priority = NF_IP_PRI_FILTER,
},
{
.hook = arptable_filter_hook,
.owner = THIS_MODULE,
.pf = NFPROTO_ARP,
.hooknum = NF_ARP_OUT,
.priority = NF_IP_PRI_FILTER,
},
{
.hook = arptable_filter_hook,
.owner = THIS_MODULE,
.pf = NFPROTO_ARP,
.hooknum = NF_ARP_FORWARD,
.priority = NF_IP_PRI_FILTER,
},
};
static struct nf_hook_ops *arpfilter_ops __read_mostly;
static int __net_init arptable_filter_net_init(struct net *net)
{
@ -115,9 +94,11 @@ static int __init arptable_filter_init(void)
if (ret < 0)
return ret;
ret = nf_register_hooks(arpt_ops, ARRAY_SIZE(arpt_ops));
if (ret < 0)
arpfilter_ops = xt_hook_link(&packet_filter, arptable_filter_hook);
if (IS_ERR(arpfilter_ops)) {
ret = PTR_ERR(arpfilter_ops);
goto cleanup_table;
}
return ret;
cleanup_table:
@ -127,7 +108,7 @@ cleanup_table:
static void __exit arptable_filter_fini(void)
{
nf_unregister_hooks(arpt_ops, ARRAY_SIZE(arpt_ops));
xt_hook_unlink(&packet_filter, arpfilter_ops);
unregister_pernet_subsys(&arptable_filter_net_ops);
}

33
net/ipv4/netfilter/iptable_filter.c
View File

@ -58,6 +58,7 @@ static const struct xt_table packet_filter = {
.valid_hooks = FILTER_VALID_HOOKS,
.me = THIS_MODULE,
.af = NFPROTO_IPV4,
.priority = NF_IP_PRI_FILTER,
};
static unsigned int
@ -77,29 +78,7 @@ iptable_filter_hook(unsigned int hook, struct sk_buff *skb,
return ipt_do_table(skb, hook, in, out, net->ipv4.iptable_filter);
}
static struct nf_hook_ops ipt_ops[] __read_mostly = {
{
.hook = iptable_filter_hook,
.owner = THIS_MODULE,
.pf = NFPROTO_IPV4,
.hooknum = NF_INET_LOCAL_IN,
.priority = NF_IP_PRI_FILTER,
},
{
.hook = iptable_filter_hook,
.owner = THIS_MODULE,
.pf = NFPROTO_IPV4,
.hooknum = NF_INET_FORWARD,
.priority = NF_IP_PRI_FILTER,
},
{
.hook = iptable_filter_hook,
.owner = THIS_MODULE,
.pf = NFPROTO_IPV4,
.hooknum = NF_INET_LOCAL_OUT,
.priority = NF_IP_PRI_FILTER,
},
};
static struct nf_hook_ops *filter_ops __read_mostly;
/* Default to forward because I got too much mail already. */
static int forward = NF_ACCEPT;
@ -142,9 +121,11 @@ static int __init iptable_filter_init(void)
return ret;
/* Register hooks */
ret = nf_register_hooks(ipt_ops, ARRAY_SIZE(ipt_ops));
if (ret < 0)
filter_ops = xt_hook_link(&packet_filter, iptable_filter_hook);
if (IS_ERR(filter_ops)) {
ret = PTR_ERR(filter_ops);
goto cleanup_table;
}
return ret;
@ -155,7 +136,7 @@ static int __init iptable_filter_init(void)
static void __exit iptable_filter_fini(void)
{
nf_unregister_hooks(ipt_ops, ARRAY_SIZE(ipt_ops));
xt_hook_unlink(&packet_filter, filter_ops);
unregister_pernet_subsys(&iptable_filter_net_ops);
}

47
net/ipv4/netfilter/iptable_mangle.c
View File

@ -69,6 +69,7 @@ static const struct xt_table packet_mangler = {
.valid_hooks = MANGLE_VALID_HOOKS,
.me = THIS_MODULE,
.af = NFPROTO_IPV4,
.priority = NF_IP_PRI_MANGLE,
};
static unsigned int
@ -129,43 +130,7 @@ iptable_mangle_hook(unsigned int hook,
dev_net(in)->ipv4.iptable_mangle);
}
static struct nf_hook_ops ipt_ops[] __read_mostly = {
{
.hook = iptable_mangle_hook,
.owner = THIS_MODULE,
.pf = NFPROTO_IPV4,
.hooknum = NF_INET_PRE_ROUTING,
.priority = NF_IP_PRI_MANGLE,
},
{
.hook = iptable_mangle_hook,
.owner = THIS_MODULE,
.pf = NFPROTO_IPV4,
.hooknum = NF_INET_LOCAL_IN,
.priority = NF_IP_PRI_MANGLE,
},
{
.hook = iptable_mangle_hook,
.owner = THIS_MODULE,
.pf = NFPROTO_IPV4,
.hooknum = NF_INET_FORWARD,
.priority = NF_IP_PRI_MANGLE,
},
{
.hook = iptable_mangle_hook,
.owner = THIS_MODULE,
.pf = NFPROTO_IPV4,
.hooknum = NF_INET_LOCAL_OUT,
.priority = NF_IP_PRI_MANGLE,
},
{
.hook = iptable_mangle_hook,
.owner = THIS_MODULE,
.pf = NFPROTO_IPV4,
.hooknum = NF_INET_POST_ROUTING,
.priority = NF_IP_PRI_MANGLE,
},
};
static struct nf_hook_ops *mangle_ops __read_mostly;
static int __net_init iptable_mangle_net_init(struct net *net)
{
@ -196,9 +161,11 @@ static int __init iptable_mangle_init(void)
return ret;
/* Register hooks */
ret = nf_register_hooks(ipt_ops, ARRAY_SIZE(ipt_ops));
if (ret < 0)
mangle_ops = xt_hook_link(&packet_mangler, iptable_mangle_hook);
if (IS_ERR(mangle_ops)) {
ret = PTR_ERR(mangle_ops);
goto cleanup_table;
}
return ret;
@ -209,7 +176,7 @@ static int __init iptable_mangle_init(void)
static void __exit iptable_mangle_fini(void)
{
nf_unregister_hooks(ipt_ops, ARRAY_SIZE(ipt_ops));
xt_hook_unlink(&packet_mangler, mangle_ops);
unregister_pernet_subsys(&iptable_mangle_net_ops);
}

27
net/ipv4/netfilter/iptable_raw.c
View File

@ -41,6 +41,7 @@ static const struct xt_table packet_raw = {
.valid_hooks = RAW_VALID_HOOKS,
.me = THIS_MODULE,
.af = NFPROTO_IPV4,
.priority = NF_IP_PRI_RAW,
};
/* The work comes in here from netfilter.c. */
@ -61,23 +62,7 @@ iptable_raw_hook(unsigned int hook, struct sk_buff *skb,
return ipt_do_table(skb, hook, in, out, net->ipv4.iptable_raw);
}
/* 'raw' is the very first table. */
static struct nf_hook_ops ipt_ops[] __read_mostly = {
{
.hook = iptable_raw_hook,
.pf = NFPROTO_IPV4,
.hooknum = NF_INET_PRE_ROUTING,
.priority = NF_IP_PRI_RAW,
.owner = THIS_MODULE,
},
{
.hook = iptable_raw_hook,
.pf = NFPROTO_IPV4,
.hooknum = NF_INET_LOCAL_OUT,
.priority = NF_IP_PRI_RAW,
.owner = THIS_MODULE,
},
};
static struct nf_hook_ops *rawtable_ops __read_mostly;
static int __net_init iptable_raw_net_init(struct net *net)
{
@ -108,9 +93,11 @@ static int __init iptable_raw_init(void)
return ret;
/* Register hooks */
ret = nf_register_hooks(ipt_ops, ARRAY_SIZE(ipt_ops));
if (ret < 0)
rawtable_ops = xt_hook_link(&packet_raw, iptable_raw_hook);
if (IS_ERR(rawtable_ops)) {
ret = PTR_ERR(rawtable_ops);
goto cleanup_table;
}
return ret;
@ -121,7 +108,7 @@ static int __init iptable_raw_init(void)
static void __exit iptable_raw_fini(void)
{
nf_unregister_hooks(ipt_ops, ARRAY_SIZE(ipt_ops));
xt_hook_unlink(&packet_raw, rawtable_ops);
unregister_pernet_subsys(&iptable_raw_net_ops);
}

33
net/ipv4/netfilter/iptable_security.c
View File

@ -62,6 +62,7 @@ static const struct xt_table security_table = {
.valid_hooks = SECURITY_VALID_HOOKS,
.me = THIS_MODULE,
.af = NFPROTO_IPV4,
.priority = NF_IP_PRI_SECURITY,
};
static unsigned int
@ -82,29 +83,7 @@ iptable_security_hook(unsigned int hook, struct sk_buff *skb,
return ipt_do_table(skb, hook, in, out, net->ipv4.iptable_security);
}
static struct nf_hook_ops ipt_ops[] __read_mostly = {
{
.hook = iptable_security_hook,
.owner = THIS_MODULE,
.pf = NFPROTO_IPV4,
.hooknum = NF_INET_LOCAL_IN,
.priority = NF_IP_PRI_SECURITY,
},
{
.hook = iptable_security_hook,
.owner = THIS_MODULE,
.pf = NFPROTO_IPV4,
.hooknum = NF_INET_FORWARD,
.priority = NF_IP_PRI_SECURITY,
},
{
.hook = iptable_security_hook,
.owner = THIS_MODULE,
.pf = NFPROTO_IPV4,
.hooknum = NF_INET_LOCAL_OUT,
.priority = NF_IP_PRI_SECURITY,
},
};
static struct nf_hook_ops *sectbl_ops __read_mostly;
static int __net_init iptable_security_net_init(struct net *net)
{
@ -135,9 +114,11 @@ static int __init iptable_security_init(void)
if (ret < 0)
return ret;
ret = nf_register_hooks(ipt_ops, ARRAY_SIZE(ipt_ops));
if (ret < 0)
sectbl_ops = xt_hook_link(&security_table, iptable_security_hook);
if (IS_ERR(sectbl_ops)) {
ret = PTR_ERR(sectbl_ops);
goto cleanup_table;
}
return ret;
@ -148,7 +129,7 @@ cleanup_table:
static void __exit iptable_security_fini(void)
{
nf_unregister_hooks(ipt_ops, ARRAY_SIZE(ipt_ops));
xt_hook_unlink(&security_table, sectbl_ops);
unregister_pernet_subsys(&iptable_security_net_ops);
}

33
net/ipv6/netfilter/ip6table_filter.c
View File

@ -56,6 +56,7 @@ static const struct xt_table packet_filter = {
.valid_hooks = FILTER_VALID_HOOKS,
.me = THIS_MODULE,
.af = NFPROTO_IPV6,
.priority = NF_IP6_PRI_FILTER,
};
/* The work comes in here from netfilter.c. */
@ -69,29 +70,7 @@ ip6table_filter_hook(unsigned int hook, struct sk_buff *skb,
return ip6t_do_table(skb, hook, in, out, net->ipv6.ip6table_filter);
}
static struct nf_hook_ops ip6t_ops[] __read_mostly = {
{
.hook = ip6table_filter_hook,
.owner = THIS_MODULE,
.pf = NFPROTO_IPV6,
.hooknum = NF_INET_LOCAL_IN,
.priority = NF_IP6_PRI_FILTER,
},
{
.hook = ip6table_filter_hook,
.owner = THIS_MODULE,
.pf = NFPROTO_IPV6,
.hooknum = NF_INET_FORWARD,
.priority = NF_IP6_PRI_FILTER,
},
{
.hook = ip6table_filter_hook,
.owner = THIS_MODULE,
.pf = NFPROTO_IPV6,
.hooknum = NF_INET_LOCAL_OUT,
.priority = NF_IP6_PRI_FILTER,
},
};
static struct nf_hook_ops *filter_ops __read_mostly;
/* Default to forward because I got too much mail already. */
static int forward = NF_ACCEPT;
@ -134,9 +113,11 @@ static int __init ip6table_filter_init(void)
return ret;
/* Register hooks */
ret = nf_register_hooks(ip6t_ops, ARRAY_SIZE(ip6t_ops));
if (ret < 0)
filter_ops = xt_hook_link(&packet_filter, ip6table_filter_hook);
if (IS_ERR(filter_ops)) {
ret = PTR_ERR(filter_ops);
goto cleanup_table;
}
return ret;
@ -147,7 +128,7 @@ static int __init ip6table_filter_init(void)
static void __exit ip6table_filter_fini(void)
{
nf_unregister_hooks(ip6t_ops, ARRAY_SIZE(ip6t_ops));
xt_hook_unlink(&packet_filter, filter_ops);
unregister_pernet_subsys(&ip6table_filter_net_ops);
}

48
net/ipv6/netfilter/ip6table_mangle.c
View File

@ -62,6 +62,7 @@ static const struct xt_table packet_mangler = {
.valid_hooks = MANGLE_VALID_HOOKS,
.me = THIS_MODULE,
.af = NFPROTO_IPV6,
.priority = NF_IP6_PRI_MANGLE,
};
static unsigned int
@ -122,44 +123,7 @@ ip6table_mangle_hook(unsigned int hook, struct sk_buff *skb,
dev_net(in)->ipv6.ip6table_mangle);
}
static struct nf_hook_ops ip6t_ops[] __read_mostly = {
{
.hook = ip6table_mangle_hook,
.owner = THIS_MODULE,
.pf = NFPROTO_IPV6,
.hooknum = NF_INET_PRE_ROUTING,
.priority = NF_IP6_PRI_MANGLE,
},
{
.hook = ip6table_mangle_hook,
.owner = THIS_MODULE,
.pf = NFPROTO_IPV6,
.hooknum = NF_INET_LOCAL_IN,
.priority = NF_IP6_PRI_MANGLE,
},
{
.hook = ip6table_mangle_hook,
.owner = THIS_MODULE,
.pf = NFPROTO_IPV6,
.hooknum = NF_INET_FORWARD,
.priority = NF_IP6_PRI_MANGLE,
},
{
.hook = ip6table_mangle_hook,
.owner = THIS_MODULE,
.pf = NFPROTO_IPV6,
.hooknum = NF_INET_LOCAL_OUT,
.priority = NF_IP6_PRI_MANGLE,
},
{
.hook = ip6table_mangle_hook,
.owner = THIS_MODULE,
.pf = NFPROTO_IPV6,
.hooknum = NF_INET_POST_ROUTING,
.priority = NF_IP6_PRI_MANGLE,
},
};
static struct nf_hook_ops *mangle_ops __read_mostly;
static int __net_init ip6table_mangle_net_init(struct net *net)
{
/* Register table */
@ -189,9 +153,11 @@ static int __init ip6table_mangle_init(void)
return ret;
/* Register hooks */
ret = nf_register_hooks(ip6t_ops, ARRAY_SIZE(ip6t_ops));
if (ret < 0)
mangle_ops = xt_hook_link(&packet_mangler, ip6table_mangle_hook);
if (IS_ERR(mangle_ops)) {
ret = PTR_ERR(mangle_ops);
goto cleanup_table;
}
return ret;
@ -202,7 +168,7 @@ static int __init ip6table_mangle_init(void)
static void __exit ip6table_mangle_fini(void)
{
nf_unregister_hooks(ip6t_ops, ARRAY_SIZE(ip6t_ops));
xt_hook_unlink(&packet_mangler, mangle_ops);
unregister_pernet_subsys(&ip6table_mangle_net_ops);
}

26
net/ipv6/netfilter/ip6table_raw.c
View File

@ -40,6 +40,7 @@ static const struct xt_table packet_raw = {
.valid_hooks = RAW_VALID_HOOKS,
.me = THIS_MODULE,
.af = NFPROTO_IPV6,
.priority = NF_IP6_PRI_FIRST,
};
/* The work comes in here from netfilter.c. */
@ -53,22 +54,7 @@ ip6table_raw_hook(unsigned int hook, struct sk_buff *skb,
return ip6t_do_table(skb, hook, in, out, net->ipv6.ip6table_raw);
}
static struct nf_hook_ops ip6t_ops[] __read_mostly = {
{
.hook = ip6table_raw_hook,
.pf = NFPROTO_IPV6,
.hooknum = NF_INET_PRE_ROUTING,
.priority = NF_IP6_PRI_FIRST,
.owner = THIS_MODULE,
},
{
.hook = ip6table_raw_hook,
.pf = NFPROTO_IPV6,
.hooknum = NF_INET_LOCAL_OUT,
.priority = NF_IP6_PRI_FIRST,
.owner = THIS_MODULE,
},
};
static struct nf_hook_ops *rawtable_ops __read_mostly;
static int __net_init ip6table_raw_net_init(struct net *net)
{
@ -99,9 +85,11 @@ static int __init ip6table_raw_init(void)
return ret;
/* Register hooks */
ret = nf_register_hooks(ip6t_ops, ARRAY_SIZE(ip6t_ops));
if (ret < 0)
rawtable_ops = xt_hook_link(&packet_raw, ip6table_raw_hook);
if (IS_ERR(rawtable_ops)) {
ret = PTR_ERR(rawtable_ops);
goto cleanup_table;
}
return ret;
@ -112,7 +100,7 @@ static int __init ip6table_raw_init(void)
static void __exit ip6table_raw_fini(void)
{
nf_unregister_hooks(ip6t_ops, ARRAY_SIZE(ip6t_ops));
xt_hook_unlink(&packet_raw, rawtable_ops);
unregister_pernet_subsys(&ip6table_raw_net_ops);
}

33
net/ipv6/netfilter/ip6table_security.c
View File

@ -61,6 +61,7 @@ static const struct xt_table security_table = {
.valid_hooks = SECURITY_VALID_HOOKS,
.me = THIS_MODULE,
.af = NFPROTO_IPV6,
.priority = NF_IP6_PRI_SECURITY,
};
static unsigned int
@ -74,29 +75,7 @@ ip6table_security_hook(unsigned int hook, struct sk_buff *skb,
return ip6t_do_table(skb, hook, in, out, net->ipv6.ip6table_security);
}
static struct nf_hook_ops ip6t_ops[] __read_mostly = {
{
.hook = ip6table_security_hook,
.owner = THIS_MODULE,
.pf = NFPROTO_IPV6,
.hooknum = NF_INET_LOCAL_IN,
.priority = NF_IP6_PRI_SECURITY,
},
{
.hook = ip6table_security_hook,
.owner = THIS_MODULE,
.pf = NFPROTO_IPV6,
.hooknum = NF_INET_FORWARD,
.priority = NF_IP6_PRI_SECURITY,
},
{
.hook = ip6table_security_hook,
.owner = THIS_MODULE,
.pf = NFPROTO_IPV6,
.hooknum = NF_INET_LOCAL_OUT,
.priority = NF_IP6_PRI_SECURITY,
},
};
static struct nf_hook_ops *sectbl_ops __read_mostly;
static int __net_init ip6table_security_net_init(struct net *net)
{
@ -127,9 +106,11 @@ static int __init ip6table_security_init(void)
if (ret < 0)
return ret;
ret = nf_register_hooks(ip6t_ops, ARRAY_SIZE(ip6t_ops));
if (ret < 0)
sectbl_ops = xt_hook_link(&security_table, ip6table_security_hook);
if (IS_ERR(sectbl_ops)) {
ret = PTR_ERR(sectbl_ops);
goto cleanup_table;
}
return ret;
@ -140,7 +121,7 @@ cleanup_table:
static void __exit ip6table_security_fini(void)
{
nf_unregister_hooks(ip6t_ops, ARRAY_SIZE(ip6t_ops));
xt_hook_unlink(&security_table, sectbl_ops);
unregister_pernet_subsys(&ip6table_security_net_ops);
}

54
net/netfilter/x_tables.c
View File

@ -1091,6 +1091,60 @@ static const struct file_operations xt_target_ops = {
#endif /* CONFIG_PROC_FS */
/**
* xt_hook_link - set up hooks for a new table
* @table: table with metadata needed to set up hooks
* @fn: Hook function
*
* This function will take care of creating and registering the necessary
* Netfilter hooks for XT tables.
*/
struct nf_hook_ops *xt_hook_link(const struct xt_table *table, nf_hookfn *fn)
{
unsigned int hook_mask = table->valid_hooks;
uint8_t i, num_hooks = hweight32(hook_mask);
uint8_t hooknum;
struct nf_hook_ops *ops;
int ret;
ops = kmalloc(sizeof(*ops) * num_hooks, GFP_KERNEL);
if (ops == NULL)
return ERR_PTR(-ENOMEM);
for (i = 0, hooknum = 0; i < num_hooks && hook_mask != 0;
hook_mask >>= 1, ++hooknum) {
if (!(hook_mask & 1))
continue;
ops[i].hook = fn;
ops[i].owner = table->me;
ops[i].pf = table->af;
ops[i].hooknum = hooknum;
ops[i].priority = table->priority;
++i;
}
ret = nf_register_hooks(ops, num_hooks);
if (ret < 0) {
kfree(ops);
return ERR_PTR(ret);
}
return ops;
}
EXPORT_SYMBOL_GPL(xt_hook_link);
/**
* xt_hook_unlink - remove hooks for a table
* @ops: nf_hook_ops array as returned by nf_hook_link
* @hook_mask: the very same mask that was passed to nf_hook_link
*/
void xt_hook_unlink(const struct xt_table *table, struct nf_hook_ops *ops)
{
nf_unregister_hooks(ops, hweight32(table->valid_hooks));
kfree(ops);
}
EXPORT_SYMBOL_GPL(xt_hook_unlink);
int xt_proto_init(struct net *net, u_int8_t af)
{
#ifdef CONFIG_PROC_FS