mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-24 17:59:32 +00:00
![Jussi Kivilinna](/assets/img/avatar_default.png)
Signed-off-by: Jussi Kivilinna <jussi.kivilinna@mbnet.fi> Signed-off-by: David S. Miller <davem@davemloft.net>
259 lines
6.1 KiB
C
259 lines
6.1 KiB
C
/*
|
|
* net/sched/mirred.c packet mirroring and redirect actions
|
|
*
|
|
* 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.
|
|
*
|
|
* Authors: Jamal Hadi Salim (2002-4)
|
|
*
|
|
* TODO: Add ingress support (and socket redirect support)
|
|
*
|
|
*/
|
|
|
|
#include <linux/types.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/string.h>
|
|
#include <linux/errno.h>
|
|
#include <linux/skbuff.h>
|
|
#include <linux/rtnetlink.h>
|
|
#include <linux/module.h>
|
|
#include <linux/init.h>
|
|
#include <net/net_namespace.h>
|
|
#include <net/netlink.h>
|
|
#include <net/pkt_sched.h>
|
|
#include <linux/tc_act/tc_mirred.h>
|
|
#include <net/tc_act/tc_mirred.h>
|
|
|
|
#include <linux/if_arp.h>
|
|
|
|
#define MIRRED_TAB_MASK 7
|
|
static struct tcf_common *tcf_mirred_ht[MIRRED_TAB_MASK + 1];
|
|
static u32 mirred_idx_gen;
|
|
static DEFINE_RWLOCK(mirred_lock);
|
|
|
|
static struct tcf_hashinfo mirred_hash_info = {
|
|
.htab = tcf_mirred_ht,
|
|
.hmask = MIRRED_TAB_MASK,
|
|
.lock = &mirred_lock,
|
|
};
|
|
|
|
static inline int tcf_mirred_release(struct tcf_mirred *m, int bind)
|
|
{
|
|
if (m) {
|
|
if (bind)
|
|
m->tcf_bindcnt--;
|
|
m->tcf_refcnt--;
|
|
if(!m->tcf_bindcnt && m->tcf_refcnt <= 0) {
|
|
dev_put(m->tcfm_dev);
|
|
tcf_hash_destroy(&m->common, &mirred_hash_info);
|
|
return 1;
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static const struct nla_policy mirred_policy[TCA_MIRRED_MAX + 1] = {
|
|
[TCA_MIRRED_PARMS] = { .len = sizeof(struct tc_mirred) },
|
|
};
|
|
|
|
static int tcf_mirred_init(struct nlattr *nla, struct nlattr *est,
|
|
struct tc_action *a, int ovr, int bind)
|
|
{
|
|
struct nlattr *tb[TCA_MIRRED_MAX + 1];
|
|
struct tc_mirred *parm;
|
|
struct tcf_mirred *m;
|
|
struct tcf_common *pc;
|
|
struct net_device *dev = NULL;
|
|
int ret = 0, err;
|
|
int ok_push = 0;
|
|
|
|
if (nla == NULL)
|
|
return -EINVAL;
|
|
|
|
err = nla_parse_nested(tb, TCA_MIRRED_MAX, nla, mirred_policy);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
if (tb[TCA_MIRRED_PARMS] == NULL)
|
|
return -EINVAL;
|
|
parm = nla_data(tb[TCA_MIRRED_PARMS]);
|
|
|
|
if (parm->ifindex) {
|
|
dev = __dev_get_by_index(&init_net, parm->ifindex);
|
|
if (dev == NULL)
|
|
return -ENODEV;
|
|
switch (dev->type) {
|
|
case ARPHRD_TUNNEL:
|
|
case ARPHRD_TUNNEL6:
|
|
case ARPHRD_SIT:
|
|
case ARPHRD_IPGRE:
|
|
case ARPHRD_VOID:
|
|
case ARPHRD_NONE:
|
|
ok_push = 0;
|
|
break;
|
|
default:
|
|
ok_push = 1;
|
|
break;
|
|
}
|
|
}
|
|
|
|
pc = tcf_hash_check(parm->index, a, bind, &mirred_hash_info);
|
|
if (!pc) {
|
|
if (!parm->ifindex)
|
|
return -EINVAL;
|
|
pc = tcf_hash_create(parm->index, est, a, sizeof(*m), bind,
|
|
&mirred_idx_gen, &mirred_hash_info);
|
|
if (unlikely(!pc))
|
|
return -ENOMEM;
|
|
ret = ACT_P_CREATED;
|
|
} else {
|
|
if (!ovr) {
|
|
tcf_mirred_release(to_mirred(pc), bind);
|
|
return -EEXIST;
|
|
}
|
|
}
|
|
m = to_mirred(pc);
|
|
|
|
spin_lock_bh(&m->tcf_lock);
|
|
m->tcf_action = parm->action;
|
|
m->tcfm_eaction = parm->eaction;
|
|
if (parm->ifindex) {
|
|
m->tcfm_ifindex = parm->ifindex;
|
|
if (ret != ACT_P_CREATED)
|
|
dev_put(m->tcfm_dev);
|
|
m->tcfm_dev = dev;
|
|
dev_hold(dev);
|
|
m->tcfm_ok_push = ok_push;
|
|
}
|
|
spin_unlock_bh(&m->tcf_lock);
|
|
if (ret == ACT_P_CREATED)
|
|
tcf_hash_insert(pc, &mirred_hash_info);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int tcf_mirred_cleanup(struct tc_action *a, int bind)
|
|
{
|
|
struct tcf_mirred *m = a->priv;
|
|
|
|
if (m)
|
|
return tcf_mirred_release(m, bind);
|
|
return 0;
|
|
}
|
|
|
|
static int tcf_mirred(struct sk_buff *skb, struct tc_action *a,
|
|
struct tcf_result *res)
|
|
{
|
|
struct tcf_mirred *m = a->priv;
|
|
struct net_device *dev;
|
|
struct sk_buff *skb2 = NULL;
|
|
u32 at = G_TC_AT(skb->tc_verd);
|
|
|
|
spin_lock(&m->tcf_lock);
|
|
|
|
dev = m->tcfm_dev;
|
|
m->tcf_tm.lastuse = jiffies;
|
|
|
|
if (!(dev->flags&IFF_UP) ) {
|
|
if (net_ratelimit())
|
|
printk("mirred to Houston: device %s is gone!\n",
|
|
dev->name);
|
|
bad_mirred:
|
|
if (skb2 != NULL)
|
|
kfree_skb(skb2);
|
|
m->tcf_qstats.overlimits++;
|
|
m->tcf_bstats.bytes += qdisc_pkt_len(skb);
|
|
m->tcf_bstats.packets++;
|
|
spin_unlock(&m->tcf_lock);
|
|
/* should we be asking for packet to be dropped?
|
|
* may make sense for redirect case only
|
|
*/
|
|
return TC_ACT_SHOT;
|
|
}
|
|
|
|
skb2 = skb_act_clone(skb, GFP_ATOMIC);
|
|
if (skb2 == NULL)
|
|
goto bad_mirred;
|
|
if (m->tcfm_eaction != TCA_EGRESS_MIRROR &&
|
|
m->tcfm_eaction != TCA_EGRESS_REDIR) {
|
|
if (net_ratelimit())
|
|
printk("tcf_mirred unknown action %d\n",
|
|
m->tcfm_eaction);
|
|
goto bad_mirred;
|
|
}
|
|
|
|
m->tcf_bstats.bytes += qdisc_pkt_len(skb2);
|
|
m->tcf_bstats.packets++;
|
|
if (!(at & AT_EGRESS))
|
|
if (m->tcfm_ok_push)
|
|
skb_push(skb2, skb2->dev->hard_header_len);
|
|
|
|
/* mirror is always swallowed */
|
|
if (m->tcfm_eaction != TCA_EGRESS_MIRROR)
|
|
skb2->tc_verd = SET_TC_FROM(skb2->tc_verd, at);
|
|
|
|
skb2->dev = dev;
|
|
skb2->iif = skb->dev->ifindex;
|
|
dev_queue_xmit(skb2);
|
|
spin_unlock(&m->tcf_lock);
|
|
return m->tcf_action;
|
|
}
|
|
|
|
static int tcf_mirred_dump(struct sk_buff *skb, struct tc_action *a, int bind, int ref)
|
|
{
|
|
unsigned char *b = skb_tail_pointer(skb);
|
|
struct tcf_mirred *m = a->priv;
|
|
struct tc_mirred opt;
|
|
struct tcf_t t;
|
|
|
|
opt.index = m->tcf_index;
|
|
opt.action = m->tcf_action;
|
|
opt.refcnt = m->tcf_refcnt - ref;
|
|
opt.bindcnt = m->tcf_bindcnt - bind;
|
|
opt.eaction = m->tcfm_eaction;
|
|
opt.ifindex = m->tcfm_ifindex;
|
|
NLA_PUT(skb, TCA_MIRRED_PARMS, sizeof(opt), &opt);
|
|
t.install = jiffies_to_clock_t(jiffies - m->tcf_tm.install);
|
|
t.lastuse = jiffies_to_clock_t(jiffies - m->tcf_tm.lastuse);
|
|
t.expires = jiffies_to_clock_t(m->tcf_tm.expires);
|
|
NLA_PUT(skb, TCA_MIRRED_TM, sizeof(t), &t);
|
|
return skb->len;
|
|
|
|
nla_put_failure:
|
|
nlmsg_trim(skb, b);
|
|
return -1;
|
|
}
|
|
|
|
static struct tc_action_ops act_mirred_ops = {
|
|
.kind = "mirred",
|
|
.hinfo = &mirred_hash_info,
|
|
.type = TCA_ACT_MIRRED,
|
|
.capab = TCA_CAP_NONE,
|
|
.owner = THIS_MODULE,
|
|
.act = tcf_mirred,
|
|
.dump = tcf_mirred_dump,
|
|
.cleanup = tcf_mirred_cleanup,
|
|
.lookup = tcf_hash_search,
|
|
.init = tcf_mirred_init,
|
|
.walk = tcf_generic_walker
|
|
};
|
|
|
|
MODULE_AUTHOR("Jamal Hadi Salim(2002)");
|
|
MODULE_DESCRIPTION("Device Mirror/redirect actions");
|
|
MODULE_LICENSE("GPL");
|
|
|
|
static int __init mirred_init_module(void)
|
|
{
|
|
printk("Mirror/redirect action on\n");
|
|
return tcf_register_action(&act_mirred_ops);
|
|
}
|
|
|
|
static void __exit mirred_cleanup_module(void)
|
|
{
|
|
tcf_unregister_action(&act_mirred_ops);
|
|
}
|
|
|
|
module_init(mirred_init_module);
|
|
module_exit(mirred_cleanup_module);
|