2005-04-17 00:20:36 +02:00
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/*
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* net/sched/mirred.c packet mirroring and redirect actions
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*
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* Authors: Jamal Hadi Salim (2002-4)
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*
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* TODO: Add ingress support (and socket redirect support)
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*
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*/
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#include <linux/types.h>
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#include <linux/kernel.h>
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#include <linux/string.h>
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#include <linux/errno.h>
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#include <linux/skbuff.h>
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#include <linux/rtnetlink.h>
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#include <linux/module.h>
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#include <linux/init.h>
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include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h
percpu.h is included by sched.h and module.h and thus ends up being
included when building most .c files. percpu.h includes slab.h which
in turn includes gfp.h making everything defined by the two files
universally available and complicating inclusion dependencies.
percpu.h -> slab.h dependency is about to be removed. Prepare for
this change by updating users of gfp and slab facilities include those
headers directly instead of assuming availability. As this conversion
needs to touch large number of source files, the following script is
used as the basis of conversion.
http://userweb.kernel.org/~tj/misc/slabh-sweep.py
The script does the followings.
* Scan files for gfp and slab usages and update includes such that
only the necessary includes are there. ie. if only gfp is used,
gfp.h, if slab is used, slab.h.
* When the script inserts a new include, it looks at the include
blocks and try to put the new include such that its order conforms
to its surrounding. It's put in the include block which contains
core kernel includes, in the same order that the rest are ordered -
alphabetical, Christmas tree, rev-Xmas-tree or at the end if there
doesn't seem to be any matching order.
* If the script can't find a place to put a new include (mostly
because the file doesn't have fitting include block), it prints out
an error message indicating which .h file needs to be added to the
file.
The conversion was done in the following steps.
1. The initial automatic conversion of all .c files updated slightly
over 4000 files, deleting around 700 includes and adding ~480 gfp.h
and ~3000 slab.h inclusions. The script emitted errors for ~400
files.
2. Each error was manually checked. Some didn't need the inclusion,
some needed manual addition while adding it to implementation .h or
embedding .c file was more appropriate for others. This step added
inclusions to around 150 files.
3. The script was run again and the output was compared to the edits
from #2 to make sure no file was left behind.
4. Several build tests were done and a couple of problems were fixed.
e.g. lib/decompress_*.c used malloc/free() wrappers around slab
APIs requiring slab.h to be added manually.
5. The script was run on all .h files but without automatically
editing them as sprinkling gfp.h and slab.h inclusions around .h
files could easily lead to inclusion dependency hell. Most gfp.h
inclusion directives were ignored as stuff from gfp.h was usually
wildly available and often used in preprocessor macros. Each
slab.h inclusion directive was examined and added manually as
necessary.
6. percpu.h was updated not to include slab.h.
7. Build test were done on the following configurations and failures
were fixed. CONFIG_GCOV_KERNEL was turned off for all tests (as my
distributed build env didn't work with gcov compiles) and a few
more options had to be turned off depending on archs to make things
build (like ipr on powerpc/64 which failed due to missing writeq).
* x86 and x86_64 UP and SMP allmodconfig and a custom test config.
* powerpc and powerpc64 SMP allmodconfig
* sparc and sparc64 SMP allmodconfig
* ia64 SMP allmodconfig
* s390 SMP allmodconfig
* alpha SMP allmodconfig
* um on x86_64 SMP allmodconfig
8. percpu.h modifications were reverted so that it could be applied as
a separate patch and serve as bisection point.
Given the fact that I had only a couple of failures from tests on step
6, I'm fairly confident about the coverage of this conversion patch.
If there is a breakage, it's likely to be something in one of the arch
headers which should be easily discoverable easily on most builds of
the specific arch.
Signed-off-by: Tejun Heo <tj@kernel.org>
Guess-its-ok-by: Christoph Lameter <cl@linux-foundation.org>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Lee Schermerhorn <Lee.Schermerhorn@hp.com>
2010-03-24 09:04:11 +01:00
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#include <linux/gfp.h>
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2007-09-17 20:56:21 +02:00
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#include <net/net_namespace.h>
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2007-03-26 08:06:12 +02:00
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#include <net/netlink.h>
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2005-04-17 00:20:36 +02:00
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#include <net/pkt_sched.h>
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#include <linux/tc_act/tc_mirred.h>
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#include <net/tc_act/tc_mirred.h>
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#include <linux/if_arp.h>
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2006-08-22 08:54:55 +02:00
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#define MIRRED_TAB_MASK 7
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2010-07-22 20:45:04 +02:00
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static LIST_HEAD(mirred_list);
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2013-12-16 05:15:08 +01:00
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static struct tcf_hashinfo mirred_hash_info;
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2005-04-17 00:20:36 +02:00
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2011-01-19 20:26:56 +01:00
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static int tcf_mirred_release(struct tcf_mirred *m, int bind)
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2005-04-17 00:20:36 +02:00
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{
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2006-08-22 08:54:55 +02:00
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if (m) {
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2005-04-17 00:20:36 +02:00
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if (bind)
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2006-08-22 08:54:55 +02:00
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m->tcf_bindcnt--;
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m->tcf_refcnt--;
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2011-01-19 20:26:56 +01:00
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if (!m->tcf_bindcnt && m->tcf_refcnt <= 0) {
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2010-07-22 20:45:04 +02:00
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list_del(&m->tcfm_list);
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if (m->tcfm_dev)
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dev_put(m->tcfm_dev);
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2006-08-22 08:54:55 +02:00
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tcf_hash_destroy(&m->common, &mirred_hash_info);
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2005-04-17 00:20:36 +02:00
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return 1;
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}
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}
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return 0;
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}
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2008-01-24 05:36:30 +01:00
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static const struct nla_policy mirred_policy[TCA_MIRRED_MAX + 1] = {
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[TCA_MIRRED_PARMS] = { .len = sizeof(struct tc_mirred) },
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};
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2013-01-14 06:15:39 +01:00
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static int tcf_mirred_init(struct net *net, struct nlattr *nla,
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struct nlattr *est, struct tc_action *a, int ovr,
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int bind)
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2005-04-17 00:20:36 +02:00
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{
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2008-01-23 07:11:50 +01:00
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struct nlattr *tb[TCA_MIRRED_MAX + 1];
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2005-04-17 00:20:36 +02:00
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struct tc_mirred *parm;
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2006-08-22 08:54:55 +02:00
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struct tcf_mirred *m;
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struct tcf_common *pc;
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2009-11-17 13:15:16 +01:00
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struct net_device *dev;
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int ret, ok_push = 0;
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2005-04-17 00:20:36 +02:00
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2008-01-24 05:33:32 +01:00
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if (nla == NULL)
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2005-04-17 00:20:36 +02:00
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return -EINVAL;
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2009-11-17 13:15:16 +01:00
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ret = nla_parse_nested(tb, TCA_MIRRED_MAX, nla, mirred_policy);
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|
if (ret < 0)
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return ret;
|
2008-01-24 05:36:30 +01:00
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|
if (tb[TCA_MIRRED_PARMS] == NULL)
|
2005-04-17 00:20:36 +02:00
|
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|
return -EINVAL;
|
2008-01-23 07:11:50 +01:00
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|
parm = nla_data(tb[TCA_MIRRED_PARMS]);
|
2009-11-17 13:15:16 +01:00
|
|
|
switch (parm->eaction) {
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case TCA_EGRESS_MIRROR:
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|
|
|
case TCA_EGRESS_REDIR:
|
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break;
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default:
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return -EINVAL;
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|
|
|
}
|
2005-04-17 00:20:36 +02:00
|
|
|
if (parm->ifindex) {
|
2013-01-14 06:15:39 +01:00
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dev = __dev_get_by_index(net, parm->ifindex);
|
2005-04-17 00:20:36 +02:00
|
|
|
if (dev == NULL)
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return -ENODEV;
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|
|
switch (dev->type) {
|
2009-11-17 13:15:16 +01:00
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|
|
case ARPHRD_TUNNEL:
|
|
|
|
case ARPHRD_TUNNEL6:
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case ARPHRD_SIT:
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case ARPHRD_IPGRE:
|
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case ARPHRD_VOID:
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case ARPHRD_NONE:
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ok_push = 0;
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break;
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default:
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ok_push = 1;
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break;
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2005-04-17 00:20:36 +02:00
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}
|
2009-11-17 13:15:16 +01:00
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|
|
} else {
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dev = NULL;
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2005-04-17 00:20:36 +02:00
|
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|
}
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|
|
|
|
2014-01-17 20:37:02 +01:00
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|
pc = tcf_hash_check(parm->index, a, bind);
|
2006-08-22 08:54:55 +02:00
|
|
|
if (!pc) {
|
2009-11-17 13:15:16 +01:00
|
|
|
if (dev == NULL)
|
2005-04-17 00:20:36 +02:00
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return -EINVAL;
|
2014-01-17 20:37:02 +01:00
|
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|
pc = tcf_hash_create(parm->index, est, a, sizeof(*m), bind);
|
2008-11-26 06:12:32 +01:00
|
|
|
if (IS_ERR(pc))
|
2009-11-17 13:15:16 +01:00
|
|
|
return PTR_ERR(pc);
|
2005-04-17 00:20:36 +02:00
|
|
|
ret = ACT_P_CREATED;
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|
|
|
} else {
|
|
|
|
if (!ovr) {
|
2006-08-22 08:54:55 +02:00
|
|
|
tcf_mirred_release(to_mirred(pc), bind);
|
2005-04-17 00:20:36 +02:00
|
|
|
return -EEXIST;
|
|
|
|
}
|
|
|
|
}
|
2006-08-22 08:54:55 +02:00
|
|
|
m = to_mirred(pc);
|
2005-04-17 00:20:36 +02:00
|
|
|
|
2006-08-22 08:54:55 +02:00
|
|
|
spin_lock_bh(&m->tcf_lock);
|
|
|
|
m->tcf_action = parm->action;
|
|
|
|
m->tcfm_eaction = parm->eaction;
|
2009-11-17 13:15:16 +01:00
|
|
|
if (dev != NULL) {
|
2006-08-22 08:54:55 +02:00
|
|
|
m->tcfm_ifindex = parm->ifindex;
|
2005-04-17 00:20:36 +02:00
|
|
|
if (ret != ACT_P_CREATED)
|
2006-08-22 08:54:55 +02:00
|
|
|
dev_put(m->tcfm_dev);
|
2005-04-17 00:20:36 +02:00
|
|
|
dev_hold(dev);
|
2009-11-17 13:15:16 +01:00
|
|
|
m->tcfm_dev = dev;
|
2006-08-22 08:54:55 +02:00
|
|
|
m->tcfm_ok_push = ok_push;
|
2005-04-17 00:20:36 +02:00
|
|
|
}
|
2006-08-22 08:54:55 +02:00
|
|
|
spin_unlock_bh(&m->tcf_lock);
|
2010-07-22 20:45:04 +02:00
|
|
|
if (ret == ACT_P_CREATED) {
|
|
|
|
list_add(&m->tcfm_list, &mirred_list);
|
2014-01-17 20:37:02 +01:00
|
|
|
tcf_hash_insert(pc, a->ops->hinfo);
|
2010-07-22 20:45:04 +02:00
|
|
|
}
|
2005-04-17 00:20:36 +02:00
|
|
|
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
2006-08-22 08:54:55 +02:00
|
|
|
static int tcf_mirred_cleanup(struct tc_action *a, int bind)
|
2005-04-17 00:20:36 +02:00
|
|
|
{
|
2006-08-22 08:54:55 +02:00
|
|
|
struct tcf_mirred *m = a->priv;
|
2005-04-17 00:20:36 +02:00
|
|
|
|
2006-08-22 08:54:55 +02:00
|
|
|
if (m)
|
|
|
|
return tcf_mirred_release(m, bind);
|
2005-04-17 00:20:36 +02:00
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2011-07-06 01:25:42 +02:00
|
|
|
static int tcf_mirred(struct sk_buff *skb, const struct tc_action *a,
|
2006-08-22 08:54:55 +02:00
|
|
|
struct tcf_result *res)
|
2005-04-17 00:20:36 +02:00
|
|
|
{
|
2006-08-22 08:54:55 +02:00
|
|
|
struct tcf_mirred *m = a->priv;
|
2005-04-17 00:20:36 +02:00
|
|
|
struct net_device *dev;
|
2009-11-17 13:14:00 +01:00
|
|
|
struct sk_buff *skb2;
|
|
|
|
u32 at;
|
|
|
|
int retval, err = 1;
|
2005-04-17 00:20:36 +02:00
|
|
|
|
2006-08-22 08:54:55 +02:00
|
|
|
spin_lock(&m->tcf_lock);
|
|
|
|
m->tcf_tm.lastuse = jiffies;
|
2011-01-09 09:30:54 +01:00
|
|
|
bstats_update(&m->tcf_bstats, skb);
|
2005-04-17 00:20:36 +02:00
|
|
|
|
2009-11-17 13:14:00 +01:00
|
|
|
dev = m->tcfm_dev;
|
2010-07-22 20:45:04 +02:00
|
|
|
if (!dev) {
|
|
|
|
printk_once(KERN_NOTICE "tc mirred: target device is gone\n");
|
|
|
|
goto out;
|
|
|
|
}
|
|
|
|
|
2009-11-17 13:14:00 +01:00
|
|
|
if (!(dev->flags & IFF_UP)) {
|
2012-05-13 23:56:26 +02:00
|
|
|
net_notice_ratelimited("tc mirred to Houston: device %s is down\n",
|
|
|
|
dev->name);
|
2009-11-17 13:14:00 +01:00
|
|
|
goto out;
|
2005-04-17 00:20:36 +02:00
|
|
|
}
|
|
|
|
|
2010-06-24 18:25:12 +02:00
|
|
|
at = G_TC_AT(skb->tc_verd);
|
|
|
|
skb2 = skb_act_clone(skb, GFP_ATOMIC, m->tcf_action);
|
2005-04-17 00:20:36 +02:00
|
|
|
if (skb2 == NULL)
|
2009-11-17 13:14:00 +01:00
|
|
|
goto out;
|
2005-04-17 00:20:36 +02:00
|
|
|
|
2009-11-17 13:14:00 +01:00
|
|
|
if (!(at & AT_EGRESS)) {
|
2006-08-22 08:54:55 +02:00
|
|
|
if (m->tcfm_ok_push)
|
2005-04-17 00:20:36 +02:00
|
|
|
skb_push(skb2, skb2->dev->hard_header_len);
|
2009-11-17 13:14:00 +01:00
|
|
|
}
|
2005-04-17 00:20:36 +02:00
|
|
|
|
|
|
|
/* mirror is always swallowed */
|
2006-08-22 08:54:55 +02:00
|
|
|
if (m->tcfm_eaction != TCA_EGRESS_MIRROR)
|
2005-04-17 00:20:36 +02:00
|
|
|
skb2->tc_verd = SET_TC_FROM(skb2->tc_verd, at);
|
|
|
|
|
2009-11-21 00:35:04 +01:00
|
|
|
skb2->skb_iif = skb->dev->ifindex;
|
2010-06-24 18:25:12 +02:00
|
|
|
skb2->dev = dev;
|
2011-08-15 07:25:40 +02:00
|
|
|
err = dev_queue_xmit(skb2);
|
2009-11-17 13:14:00 +01:00
|
|
|
|
|
|
|
out:
|
|
|
|
if (err) {
|
|
|
|
m->tcf_qstats.overlimits++;
|
2012-08-15 22:44:27 +02:00
|
|
|
if (m->tcfm_eaction != TCA_EGRESS_MIRROR)
|
|
|
|
retval = TC_ACT_SHOT;
|
|
|
|
else
|
|
|
|
retval = m->tcf_action;
|
|
|
|
} else
|
2009-11-17 13:14:00 +01:00
|
|
|
retval = m->tcf_action;
|
2006-08-22 08:54:55 +02:00
|
|
|
spin_unlock(&m->tcf_lock);
|
2009-11-17 13:14:00 +01:00
|
|
|
|
|
|
|
return retval;
|
2005-04-17 00:20:36 +02:00
|
|
|
}
|
|
|
|
|
2006-08-22 08:54:55 +02:00
|
|
|
static int tcf_mirred_dump(struct sk_buff *skb, struct tc_action *a, int bind, int ref)
|
2005-04-17 00:20:36 +02:00
|
|
|
{
|
2007-04-20 05:29:13 +02:00
|
|
|
unsigned char *b = skb_tail_pointer(skb);
|
2006-08-22 08:54:55 +02:00
|
|
|
struct tcf_mirred *m = a->priv;
|
2010-08-16 22:04:22 +02:00
|
|
|
struct tc_mirred opt = {
|
|
|
|
.index = m->tcf_index,
|
|
|
|
.action = m->tcf_action,
|
|
|
|
.refcnt = m->tcf_refcnt - ref,
|
|
|
|
.bindcnt = m->tcf_bindcnt - bind,
|
|
|
|
.eaction = m->tcfm_eaction,
|
|
|
|
.ifindex = m->tcfm_ifindex,
|
|
|
|
};
|
2005-04-17 00:20:36 +02:00
|
|
|
struct tcf_t t;
|
|
|
|
|
2012-03-29 11:11:39 +02:00
|
|
|
if (nla_put(skb, TCA_MIRRED_PARMS, sizeof(opt), &opt))
|
|
|
|
goto nla_put_failure;
|
2006-08-22 08:54:55 +02:00
|
|
|
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);
|
2012-03-29 11:11:39 +02:00
|
|
|
if (nla_put(skb, TCA_MIRRED_TM, sizeof(t), &t))
|
|
|
|
goto nla_put_failure;
|
2005-04-17 00:20:36 +02:00
|
|
|
return skb->len;
|
|
|
|
|
2008-01-23 07:11:50 +01:00
|
|
|
nla_put_failure:
|
2007-03-26 08:06:12 +02:00
|
|
|
nlmsg_trim(skb, b);
|
2005-04-17 00:20:36 +02:00
|
|
|
return -1;
|
|
|
|
}
|
|
|
|
|
2010-07-22 20:45:04 +02:00
|
|
|
static int mirred_device_event(struct notifier_block *unused,
|
|
|
|
unsigned long event, void *ptr)
|
|
|
|
{
|
2013-05-28 03:30:21 +02:00
|
|
|
struct net_device *dev = netdev_notifier_info_to_dev(ptr);
|
2010-07-22 20:45:04 +02:00
|
|
|
struct tcf_mirred *m;
|
|
|
|
|
|
|
|
if (event == NETDEV_UNREGISTER)
|
|
|
|
list_for_each_entry(m, &mirred_list, tcfm_list) {
|
|
|
|
if (m->tcfm_dev == dev) {
|
|
|
|
dev_put(dev);
|
|
|
|
m->tcfm_dev = NULL;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
return NOTIFY_DONE;
|
|
|
|
}
|
|
|
|
|
|
|
|
static struct notifier_block mirred_device_notifier = {
|
|
|
|
.notifier_call = mirred_device_event,
|
|
|
|
};
|
|
|
|
|
2005-04-17 00:20:36 +02:00
|
|
|
static struct tc_action_ops act_mirred_ops = {
|
|
|
|
.kind = "mirred",
|
2006-08-22 08:54:55 +02:00
|
|
|
.hinfo = &mirred_hash_info,
|
2005-04-17 00:20:36 +02:00
|
|
|
.type = TCA_ACT_MIRRED,
|
|
|
|
.owner = THIS_MODULE,
|
|
|
|
.act = tcf_mirred,
|
|
|
|
.dump = tcf_mirred_dump,
|
|
|
|
.cleanup = tcf_mirred_cleanup,
|
|
|
|
.init = tcf_mirred_init,
|
|
|
|
};
|
|
|
|
|
|
|
|
MODULE_AUTHOR("Jamal Hadi Salim(2002)");
|
|
|
|
MODULE_DESCRIPTION("Device Mirror/redirect actions");
|
|
|
|
MODULE_LICENSE("GPL");
|
|
|
|
|
2006-08-22 08:54:55 +02:00
|
|
|
static int __init mirred_init_module(void)
|
2005-04-17 00:20:36 +02:00
|
|
|
{
|
2010-07-22 20:45:04 +02:00
|
|
|
int err = register_netdevice_notifier(&mirred_device_notifier);
|
|
|
|
if (err)
|
|
|
|
return err;
|
|
|
|
|
2013-12-20 09:08:51 +01:00
|
|
|
err = tcf_hashinfo_init(&mirred_hash_info, MIRRED_TAB_MASK);
|
2013-12-16 05:15:08 +01:00
|
|
|
if (err) {
|
|
|
|
unregister_netdevice_notifier(&mirred_device_notifier);
|
|
|
|
return err;
|
|
|
|
}
|
2010-05-12 08:37:05 +02:00
|
|
|
pr_info("Mirror/redirect action on\n");
|
2005-04-17 00:20:36 +02:00
|
|
|
return tcf_register_action(&act_mirred_ops);
|
|
|
|
}
|
|
|
|
|
2006-08-22 08:54:55 +02:00
|
|
|
static void __exit mirred_cleanup_module(void)
|
2005-04-17 00:20:36 +02:00
|
|
|
{
|
|
|
|
tcf_unregister_action(&act_mirred_ops);
|
2013-12-20 09:08:51 +01:00
|
|
|
tcf_hashinfo_destroy(&mirred_hash_info);
|
|
|
|
unregister_netdevice_notifier(&mirred_device_notifier);
|
2005-04-17 00:20:36 +02:00
|
|
|
}
|
|
|
|
|
|
|
|
module_init(mirred_init_module);
|
|
|
|
module_exit(mirred_cleanup_module);
|