linux/net/sched/act_ipt.c
Tim Schmielau cd354f1ae7 [PATCH] remove many unneeded #includes of sched.h
After Al Viro (finally) succeeded in removing the sched.h #include in module.h
recently, it makes sense again to remove other superfluous sched.h includes.
There are quite a lot of files which include it but don't actually need
anything defined in there.  Presumably these includes were once needed for
macros that used to live in sched.h, but moved to other header files in the
course of cleaning it up.

To ease the pain, this time I did not fiddle with any header files and only
removed #includes from .c-files, which tend to cause less trouble.

Compile tested against 2.6.20-rc2 and 2.6.20-rc2-mm2 (with offsets) on alpha,
arm, i386, ia64, mips, powerpc, and x86_64 with allnoconfig, defconfig,
allmodconfig, and allyesconfig as well as a few randconfigs on x86_64 and all
configs in arch/arm/configs on arm.  I also checked that no new warnings were
introduced by the patch (actually, some warnings are removed that were emitted
by unnecessarily included header files).

Signed-off-by: Tim Schmielau <tim@physik3.uni-rostock.de>
Acked-by: Russell King <rmk+kernel@arm.linux.org.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-02-14 08:09:54 -08:00

314 lines
7.7 KiB
C

/*
* net/sched/ipt.c iptables target interface
*
*TODO: Add other tables. For now we only support the ipv4 table targets
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*
* Copyright: Jamal Hadi Salim (2002-4)
*/
#include <asm/uaccess.h>
#include <asm/system.h>
#include <asm/bitops.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/mm.h>
#include <linux/socket.h>
#include <linux/sockios.h>
#include <linux/in.h>
#include <linux/errno.h>
#include <linux/interrupt.h>
#include <linux/netdevice.h>
#include <linux/skbuff.h>
#include <linux/rtnetlink.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/proc_fs.h>
#include <linux/kmod.h>
#include <net/sock.h>
#include <net/pkt_sched.h>
#include <linux/tc_act/tc_ipt.h>
#include <net/tc_act/tc_ipt.h>
#include <linux/netfilter_ipv4/ip_tables.h>
#define IPT_TAB_MASK 15
static struct tcf_common *tcf_ipt_ht[IPT_TAB_MASK + 1];
static u32 ipt_idx_gen;
static DEFINE_RWLOCK(ipt_lock);
static struct tcf_hashinfo ipt_hash_info = {
.htab = tcf_ipt_ht,
.hmask = IPT_TAB_MASK,
.lock = &ipt_lock,
};
static int ipt_init_target(struct ipt_entry_target *t, char *table, unsigned int hook)
{
struct xt_target *target;
int ret = 0;
target = xt_request_find_target(AF_INET, t->u.user.name,
t->u.user.revision);
if (!target)
return -ENOENT;
t->u.kernel.target = target;
ret = xt_check_target(target, AF_INET, t->u.target_size - sizeof(*t),
table, hook, 0, 0);
if (ret) {
module_put(t->u.kernel.target->me);
return ret;
}
if (t->u.kernel.target->checkentry
&& !t->u.kernel.target->checkentry(table, NULL,
t->u.kernel.target, t->data,
hook)) {
module_put(t->u.kernel.target->me);
ret = -EINVAL;
}
return ret;
}
static void ipt_destroy_target(struct ipt_entry_target *t)
{
if (t->u.kernel.target->destroy)
t->u.kernel.target->destroy(t->u.kernel.target, t->data);
module_put(t->u.kernel.target->me);
}
static int tcf_ipt_release(struct tcf_ipt *ipt, int bind)
{
int ret = 0;
if (ipt) {
if (bind)
ipt->tcf_bindcnt--;
ipt->tcf_refcnt--;
if (ipt->tcf_bindcnt <= 0 && ipt->tcf_refcnt <= 0) {
ipt_destroy_target(ipt->tcfi_t);
kfree(ipt->tcfi_tname);
kfree(ipt->tcfi_t);
tcf_hash_destroy(&ipt->common, &ipt_hash_info);
ret = ACT_P_DELETED;
}
}
return ret;
}
static int tcf_ipt_init(struct rtattr *rta, struct rtattr *est,
struct tc_action *a, int ovr, int bind)
{
struct rtattr *tb[TCA_IPT_MAX];
struct tcf_ipt *ipt;
struct tcf_common *pc;
struct ipt_entry_target *td, *t;
char *tname;
int ret = 0, err;
u32 hook = 0;
u32 index = 0;
if (rta == NULL || rtattr_parse_nested(tb, TCA_IPT_MAX, rta) < 0)
return -EINVAL;
if (tb[TCA_IPT_HOOK-1] == NULL ||
RTA_PAYLOAD(tb[TCA_IPT_HOOK-1]) < sizeof(u32))
return -EINVAL;
if (tb[TCA_IPT_TARG-1] == NULL ||
RTA_PAYLOAD(tb[TCA_IPT_TARG-1]) < sizeof(*t))
return -EINVAL;
td = (struct ipt_entry_target *)RTA_DATA(tb[TCA_IPT_TARG-1]);
if (RTA_PAYLOAD(tb[TCA_IPT_TARG-1]) < td->u.target_size)
return -EINVAL;
if (tb[TCA_IPT_INDEX-1] != NULL &&
RTA_PAYLOAD(tb[TCA_IPT_INDEX-1]) >= sizeof(u32))
index = *(u32 *)RTA_DATA(tb[TCA_IPT_INDEX-1]);
pc = tcf_hash_check(index, a, bind, &ipt_hash_info);
if (!pc) {
pc = tcf_hash_create(index, est, a, sizeof(*ipt), bind,
&ipt_idx_gen, &ipt_hash_info);
if (unlikely(!pc))
return -ENOMEM;
ret = ACT_P_CREATED;
} else {
if (!ovr) {
tcf_ipt_release(to_ipt(pc), bind);
return -EEXIST;
}
}
ipt = to_ipt(pc);
hook = *(u32 *)RTA_DATA(tb[TCA_IPT_HOOK-1]);
err = -ENOMEM;
tname = kmalloc(IFNAMSIZ, GFP_KERNEL);
if (unlikely(!tname))
goto err1;
if (tb[TCA_IPT_TABLE - 1] == NULL ||
rtattr_strlcpy(tname, tb[TCA_IPT_TABLE-1], IFNAMSIZ) >= IFNAMSIZ)
strcpy(tname, "mangle");
t = kmemdup(td, td->u.target_size, GFP_KERNEL);
if (unlikely(!t))
goto err2;
if ((err = ipt_init_target(t, tname, hook)) < 0)
goto err3;
spin_lock_bh(&ipt->tcf_lock);
if (ret != ACT_P_CREATED) {
ipt_destroy_target(ipt->tcfi_t);
kfree(ipt->tcfi_tname);
kfree(ipt->tcfi_t);
}
ipt->tcfi_tname = tname;
ipt->tcfi_t = t;
ipt->tcfi_hook = hook;
spin_unlock_bh(&ipt->tcf_lock);
if (ret == ACT_P_CREATED)
tcf_hash_insert(pc, &ipt_hash_info);
return ret;
err3:
kfree(t);
err2:
kfree(tname);
err1:
kfree(pc);
return err;
}
static int tcf_ipt_cleanup(struct tc_action *a, int bind)
{
struct tcf_ipt *ipt = a->priv;
return tcf_ipt_release(ipt, bind);
}
static int tcf_ipt(struct sk_buff *skb, struct tc_action *a,
struct tcf_result *res)
{
int ret = 0, result = 0;
struct tcf_ipt *ipt = a->priv;
if (skb_cloned(skb)) {
if (pskb_expand_head(skb, 0, 0, GFP_ATOMIC))
return TC_ACT_UNSPEC;
}
spin_lock(&ipt->tcf_lock);
ipt->tcf_tm.lastuse = jiffies;
ipt->tcf_bstats.bytes += skb->len;
ipt->tcf_bstats.packets++;
/* yes, we have to worry about both in and out dev
worry later - danger - this API seems to have changed
from earlier kernels */
/* iptables targets take a double skb pointer in case the skb
* needs to be replaced. We don't own the skb, so this must not
* happen. The pskb_expand_head above should make sure of this */
ret = ipt->tcfi_t->u.kernel.target->target(&skb, skb->dev, NULL,
ipt->tcfi_hook,
ipt->tcfi_t->u.kernel.target,
ipt->tcfi_t->data);
switch (ret) {
case NF_ACCEPT:
result = TC_ACT_OK;
break;
case NF_DROP:
result = TC_ACT_SHOT;
ipt->tcf_qstats.drops++;
break;
case IPT_CONTINUE:
result = TC_ACT_PIPE;
break;
default:
if (net_ratelimit())
printk("Bogus netfilter code %d assume ACCEPT\n", ret);
result = TC_POLICE_OK;
break;
}
spin_unlock(&ipt->tcf_lock);
return result;
}
static int tcf_ipt_dump(struct sk_buff *skb, struct tc_action *a, int bind, int ref)
{
unsigned char *b = skb->tail;
struct tcf_ipt *ipt = a->priv;
struct ipt_entry_target *t;
struct tcf_t tm;
struct tc_cnt c;
/* for simple targets kernel size == user size
** user name = target name
** for foolproof you need to not assume this
*/
t = kmemdup(ipt->tcfi_t, ipt->tcfi_t->u.user.target_size, GFP_ATOMIC);
if (unlikely(!t))
goto rtattr_failure;
c.bindcnt = ipt->tcf_bindcnt - bind;
c.refcnt = ipt->tcf_refcnt - ref;
strcpy(t->u.user.name, ipt->tcfi_t->u.kernel.target->name);
RTA_PUT(skb, TCA_IPT_TARG, ipt->tcfi_t->u.user.target_size, t);
RTA_PUT(skb, TCA_IPT_INDEX, 4, &ipt->tcf_index);
RTA_PUT(skb, TCA_IPT_HOOK, 4, &ipt->tcfi_hook);
RTA_PUT(skb, TCA_IPT_CNT, sizeof(struct tc_cnt), &c);
RTA_PUT(skb, TCA_IPT_TABLE, IFNAMSIZ, ipt->tcfi_tname);
tm.install = jiffies_to_clock_t(jiffies - ipt->tcf_tm.install);
tm.lastuse = jiffies_to_clock_t(jiffies - ipt->tcf_tm.lastuse);
tm.expires = jiffies_to_clock_t(ipt->tcf_tm.expires);
RTA_PUT(skb, TCA_IPT_TM, sizeof (tm), &tm);
kfree(t);
return skb->len;
rtattr_failure:
skb_trim(skb, b - skb->data);
kfree(t);
return -1;
}
static struct tc_action_ops act_ipt_ops = {
.kind = "ipt",
.hinfo = &ipt_hash_info,
.type = TCA_ACT_IPT,
.capab = TCA_CAP_NONE,
.owner = THIS_MODULE,
.act = tcf_ipt,
.dump = tcf_ipt_dump,
.cleanup = tcf_ipt_cleanup,
.lookup = tcf_hash_search,
.init = tcf_ipt_init,
.walk = tcf_generic_walker
};
MODULE_AUTHOR("Jamal Hadi Salim(2002-4)");
MODULE_DESCRIPTION("Iptables target actions");
MODULE_LICENSE("GPL");
static int __init ipt_init_module(void)
{
return tcf_register_action(&act_ipt_ops);
}
static void __exit ipt_cleanup_module(void)
{
tcf_unregister_action(&act_ipt_ops);
}
module_init(ipt_init_module);
module_exit(ipt_cleanup_module);