mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-06 16:16:39 +07:00
2e4e6a17af
This monster-patch tries to do the best job for unifying the data structures and backend interfaces for the three evil clones ip_tables, ip6_tables and arp_tables. In an ideal world we would never have allowed this kind of copy+paste programming... but well, our world isn't (yet?) ideal. o introduce a new x_tables module o {ip,arp,ip6}_tables depend on this x_tables module o registration functions for tables, matches and targets are only wrappers around x_tables provided functions o all matches/targets that are used from ip_tables and ip6_tables are now implemented as xt_FOOBAR.c files and provide module aliases to ipt_FOOBAR and ip6t_FOOBAR o header files for xt_matches are in include/linux/netfilter/, include/linux/netfilter_{ipv4,ipv6} contains compatibility wrappers around the xt_FOOBAR.h headers Based on this patchset we're going to further unify the code, gradually getting rid of all the layer 3 specific assumptions. Signed-off-by: Harald Welte <laforge@netfilter.org> Signed-off-by: David S. Miller <davem@davemloft.net>
329 lines
7.8 KiB
C
329 lines
7.8 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/config.h>
|
|
#include <linux/types.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/sched.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>
|
|
|
|
/* use generic hash table */
|
|
#define MY_TAB_SIZE 16
|
|
#define MY_TAB_MASK 15
|
|
|
|
static u32 idx_gen;
|
|
static struct tcf_ipt *tcf_ipt_ht[MY_TAB_SIZE];
|
|
/* ipt hash table lock */
|
|
static DEFINE_RWLOCK(ipt_lock);
|
|
|
|
/* ovewrride the defaults */
|
|
#define tcf_st tcf_ipt
|
|
#define tcf_t_lock ipt_lock
|
|
#define tcf_ht tcf_ipt_ht
|
|
|
|
#define CONFIG_NET_ACT_INIT
|
|
#include <net/pkt_act.h>
|
|
|
|
static int
|
|
ipt_init_target(struct ipt_entry_target *t, char *table, unsigned int hook)
|
|
{
|
|
struct ipt_target *target;
|
|
int ret = 0;
|
|
|
|
target = xt_find_target(AF_INET, t->u.user.name, t->u.user.revision);
|
|
if (!target)
|
|
return -ENOENT;
|
|
|
|
DPRINTK("ipt_init_target: found %s\n", target->name);
|
|
t->u.kernel.target = target;
|
|
|
|
if (t->u.kernel.target->checkentry
|
|
&& !t->u.kernel.target->checkentry(table, NULL, t->data,
|
|
t->u.target_size - sizeof(*t),
|
|
hook)) {
|
|
DPRINTK("ipt_init_target: check failed for `%s'.\n",
|
|
t->u.kernel.target->name);
|
|
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->data,
|
|
t->u.target_size - sizeof(*t));
|
|
module_put(t->u.kernel.target->me);
|
|
}
|
|
|
|
static int
|
|
tcf_ipt_release(struct tcf_ipt *p, int bind)
|
|
{
|
|
int ret = 0;
|
|
if (p) {
|
|
if (bind)
|
|
p->bindcnt--;
|
|
p->refcnt--;
|
|
if (p->bindcnt <= 0 && p->refcnt <= 0) {
|
|
ipt_destroy_target(p->t);
|
|
kfree(p->tname);
|
|
kfree(p->t);
|
|
tcf_hash_destroy(p);
|
|
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 *p;
|
|
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]);
|
|
|
|
p = tcf_hash_check(index, a, ovr, bind);
|
|
if (p == NULL) {
|
|
p = tcf_hash_create(index, est, a, sizeof(*p), ovr, bind);
|
|
if (p == NULL)
|
|
return -ENOMEM;
|
|
ret = ACT_P_CREATED;
|
|
} else {
|
|
if (!ovr) {
|
|
tcf_ipt_release(p, bind);
|
|
return -EEXIST;
|
|
}
|
|
}
|
|
|
|
hook = *(u32 *)RTA_DATA(tb[TCA_IPT_HOOK-1]);
|
|
|
|
err = -ENOMEM;
|
|
tname = kmalloc(IFNAMSIZ, GFP_KERNEL);
|
|
if (tname == NULL)
|
|
goto err1;
|
|
if (tb[TCA_IPT_TABLE - 1] == NULL ||
|
|
rtattr_strlcpy(tname, tb[TCA_IPT_TABLE-1], IFNAMSIZ) >= IFNAMSIZ)
|
|
strcpy(tname, "mangle");
|
|
|
|
t = kmalloc(td->u.target_size, GFP_KERNEL);
|
|
if (t == NULL)
|
|
goto err2;
|
|
memcpy(t, td, td->u.target_size);
|
|
|
|
if ((err = ipt_init_target(t, tname, hook)) < 0)
|
|
goto err3;
|
|
|
|
spin_lock_bh(&p->lock);
|
|
if (ret != ACT_P_CREATED) {
|
|
ipt_destroy_target(p->t);
|
|
kfree(p->tname);
|
|
kfree(p->t);
|
|
}
|
|
p->tname = tname;
|
|
p->t = t;
|
|
p->hook = hook;
|
|
spin_unlock_bh(&p->lock);
|
|
if (ret == ACT_P_CREATED)
|
|
tcf_hash_insert(p);
|
|
return ret;
|
|
|
|
err3:
|
|
kfree(t);
|
|
err2:
|
|
kfree(tname);
|
|
err1:
|
|
kfree(p);
|
|
return err;
|
|
}
|
|
|
|
static int
|
|
tcf_ipt_cleanup(struct tc_action *a, int bind)
|
|
{
|
|
struct tcf_ipt *p = PRIV(a, ipt);
|
|
return tcf_ipt_release(p, 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 *p = PRIV(a, ipt);
|
|
|
|
if (skb_cloned(skb)) {
|
|
if (pskb_expand_head(skb, 0, 0, GFP_ATOMIC))
|
|
return TC_ACT_UNSPEC;
|
|
}
|
|
|
|
spin_lock(&p->lock);
|
|
|
|
p->tm.lastuse = jiffies;
|
|
p->bstats.bytes += skb->len;
|
|
p->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 = p->t->u.kernel.target->target(&skb, skb->dev, NULL,
|
|
p->hook, p->t->data, NULL);
|
|
switch (ret) {
|
|
case NF_ACCEPT:
|
|
result = TC_ACT_OK;
|
|
break;
|
|
case NF_DROP:
|
|
result = TC_ACT_SHOT;
|
|
p->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(&p->lock);
|
|
return result;
|
|
|
|
}
|
|
|
|
static int
|
|
tcf_ipt_dump(struct sk_buff *skb, struct tc_action *a, int bind, int ref)
|
|
{
|
|
struct ipt_entry_target *t;
|
|
struct tcf_t tm;
|
|
struct tc_cnt c;
|
|
unsigned char *b = skb->tail;
|
|
struct tcf_ipt *p = PRIV(a, ipt);
|
|
|
|
/* for simple targets kernel size == user size
|
|
** user name = target name
|
|
** for foolproof you need to not assume this
|
|
*/
|
|
|
|
t = kmalloc(p->t->u.user.target_size, GFP_ATOMIC);
|
|
if (t == NULL)
|
|
goto rtattr_failure;
|
|
|
|
c.bindcnt = p->bindcnt - bind;
|
|
c.refcnt = p->refcnt - ref;
|
|
memcpy(t, p->t, p->t->u.user.target_size);
|
|
strcpy(t->u.user.name, p->t->u.kernel.target->name);
|
|
|
|
DPRINTK("\ttcf_ipt_dump tablename %s length %d\n", p->tname,
|
|
strlen(p->tname));
|
|
DPRINTK("\tdump target name %s size %d size user %d "
|
|
"data[0] %x data[1] %x\n", p->t->u.kernel.target->name,
|
|
p->t->u.target_size, p->t->u.user.target_size,
|
|
p->t->data[0], p->t->data[1]);
|
|
RTA_PUT(skb, TCA_IPT_TARG, p->t->u.user.target_size, t);
|
|
RTA_PUT(skb, TCA_IPT_INDEX, 4, &p->index);
|
|
RTA_PUT(skb, TCA_IPT_HOOK, 4, &p->hook);
|
|
RTA_PUT(skb, TCA_IPT_CNT, sizeof(struct tc_cnt), &c);
|
|
RTA_PUT(skb, TCA_IPT_TABLE, IFNAMSIZ, p->tname);
|
|
tm.install = jiffies_to_clock_t(jiffies - p->tm.install);
|
|
tm.lastuse = jiffies_to_clock_t(jiffies - p->tm.lastuse);
|
|
tm.expires = jiffies_to_clock_t(p->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",
|
|
.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);
|