linux/net/sched/act_mirred.c
stephen hemminger 6ff9c3644e net sched: printk message severity
The previous patch encourage me to go look at all the messages in
the network scheduler and fix them. Many messages were missing
any severity level. Some serious ones that should never happen
were turned into WARN(), and the random noise messages that were
handled changed to pr_debug().

Signed-off-by: Stephen Hemminger <shemminger@vyatta.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2010-05-17 23:23:12 -07:00

266 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 <linux/gfp.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;
int ret, ok_push = 0;
if (nla == NULL)
return -EINVAL;
ret = nla_parse_nested(tb, TCA_MIRRED_MAX, nla, mirred_policy);
if (ret < 0)
return ret;
if (tb[TCA_MIRRED_PARMS] == NULL)
return -EINVAL;
parm = nla_data(tb[TCA_MIRRED_PARMS]);
switch (parm->eaction) {
case TCA_EGRESS_MIRROR:
case TCA_EGRESS_REDIR:
break;
default:
return -EINVAL;
}
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;
}
} else {
dev = NULL;
}
pc = tcf_hash_check(parm->index, a, bind, &mirred_hash_info);
if (!pc) {
if (dev == NULL)
return -EINVAL;
pc = tcf_hash_create(parm->index, est, a, sizeof(*m), bind,
&mirred_idx_gen, &mirred_hash_info);
if (IS_ERR(pc))
return PTR_ERR(pc);
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 (dev != NULL) {
m->tcfm_ifindex = parm->ifindex;
if (ret != ACT_P_CREATED)
dev_put(m->tcfm_dev);
dev_hold(dev);
m->tcfm_dev = 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;
u32 at;
int retval, err = 1;
spin_lock(&m->tcf_lock);
m->tcf_tm.lastuse = jiffies;
dev = m->tcfm_dev;
if (!(dev->flags & IFF_UP)) {
if (net_ratelimit())
pr_notice("tc mirred to Houston: device %s is gone!\n",
dev->name);
goto out;
}
skb2 = skb_act_clone(skb, GFP_ATOMIC);
if (skb2 == NULL)
goto out;
m->tcf_bstats.bytes += qdisc_pkt_len(skb2);
m->tcf_bstats.packets++;
at = G_TC_AT(skb->tc_verd);
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->skb_iif = skb->dev->ifindex;
dev_queue_xmit(skb2);
err = 0;
out:
if (err) {
m->tcf_qstats.overlimits++;
m->tcf_bstats.bytes += qdisc_pkt_len(skb);
m->tcf_bstats.packets++;
/* should we be asking for packet to be dropped?
* may make sense for redirect case only
*/
retval = TC_ACT_SHOT;
} else {
retval = m->tcf_action;
}
spin_unlock(&m->tcf_lock);
return retval;
}
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)
{
pr_info("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);