2005-04-16 16:20:36 -06:00
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/*
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2014-11-05 12:51:51 -07:00
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* net/sched/act_gact.c Generic actions
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2005-04-16 16:20:36 -06:00
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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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* copyright Jamal Hadi Salim (2002-4)
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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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2007-03-26 00:06:12 -06:00
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#include <net/netlink.h>
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2005-04-16 16:20:36 -06:00
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#include <net/pkt_sched.h>
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#include <linux/tc_act/tc_gact.h>
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#include <net/tc_act/tc_gact.h>
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netns: make struct pernet_operations::id unsigned int
Make struct pernet_operations::id unsigned.
There are 2 reasons to do so:
1)
This field is really an index into an zero based array and
thus is unsigned entity. Using negative value is out-of-bound
access by definition.
2)
On x86_64 unsigned 32-bit data which are mixed with pointers
via array indexing or offsets added or subtracted to pointers
are preffered to signed 32-bit data.
"int" being used as an array index needs to be sign-extended
to 64-bit before being used.
void f(long *p, int i)
{
g(p[i]);
}
roughly translates to
movsx rsi, esi
mov rdi, [rsi+...]
call g
MOVSX is 3 byte instruction which isn't necessary if the variable is
unsigned because x86_64 is zero extending by default.
Now, there is net_generic() function which, you guessed it right, uses
"int" as an array index:
static inline void *net_generic(const struct net *net, int id)
{
...
ptr = ng->ptr[id - 1];
...
}
And this function is used a lot, so those sign extensions add up.
Patch snipes ~1730 bytes on allyesconfig kernel (without all junk
messing with code generation):
add/remove: 0/0 grow/shrink: 70/598 up/down: 396/-2126 (-1730)
Unfortunately some functions actually grow bigger.
This is a semmingly random artefact of code generation with register
allocator being used differently. gcc decides that some variable
needs to live in new r8+ registers and every access now requires REX
prefix. Or it is shifted into r12, so [r12+0] addressing mode has to be
used which is longer than [r8]
However, overall balance is in negative direction:
add/remove: 0/0 grow/shrink: 70/598 up/down: 396/-2126 (-1730)
function old new delta
nfsd4_lock 3886 3959 +73
tipc_link_build_proto_msg 1096 1140 +44
mac80211_hwsim_new_radio 2776 2808 +32
tipc_mon_rcv 1032 1058 +26
svcauth_gss_legacy_init 1413 1429 +16
tipc_bcbase_select_primary 379 392 +13
nfsd4_exchange_id 1247 1260 +13
nfsd4_setclientid_confirm 782 793 +11
...
put_client_renew_locked 494 480 -14
ip_set_sockfn_get 730 716 -14
geneve_sock_add 829 813 -16
nfsd4_sequence_done 721 703 -18
nlmclnt_lookup_host 708 686 -22
nfsd4_lockt 1085 1063 -22
nfs_get_client 1077 1050 -27
tcf_bpf_init 1106 1076 -30
nfsd4_encode_fattr 5997 5930 -67
Total: Before=154856051, After=154854321, chg -0.00%
Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2016-11-16 18:58:21 -07:00
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static unsigned int gact_net_id;
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2016-07-25 17:09:41 -06:00
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static struct tc_action_ops act_gact_ops;
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2016-02-22 16:57:53 -07:00
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2005-04-16 16:20:36 -06:00
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#ifdef CONFIG_GACT_PROB
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2006-08-22 00:54:55 -06:00
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static int gact_net_rand(struct tcf_gact *gact)
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2005-04-16 16:20:36 -06:00
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{
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2015-07-06 06:18:05 -06:00
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smp_rmb(); /* coupled with smp_wmb() in tcf_gact_init() */
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if (prandom_u32() % gact->tcfg_pval)
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2006-08-22 00:54:55 -06:00
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return gact->tcf_action;
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return gact->tcfg_paction;
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2005-04-16 16:20:36 -06:00
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}
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2006-08-22 00:54:55 -06:00
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static int gact_determ(struct tcf_gact *gact)
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2005-04-16 16:20:36 -06:00
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{
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2015-07-06 06:18:06 -06:00
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u32 pack = atomic_inc_return(&gact->packets);
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2015-07-06 06:18:05 -06:00
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smp_rmb(); /* coupled with smp_wmb() in tcf_gact_init() */
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2015-07-06 06:18:06 -06:00
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if (pack % gact->tcfg_pval)
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2006-08-22 00:54:55 -06:00
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return gact->tcf_action;
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return gact->tcfg_paction;
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2005-04-16 16:20:36 -06:00
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}
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2006-08-22 00:54:55 -06:00
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typedef int (*g_rand)(struct tcf_gact *gact);
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2011-01-19 12:26:56 -07:00
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static g_rand gact_rand[MAX_RAND] = { NULL, gact_net_rand, gact_determ };
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2006-08-22 00:54:55 -06:00
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#endif /* CONFIG_GACT_PROB */
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2005-04-16 16:20:36 -06:00
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2008-01-23 21:36:30 -07:00
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static const struct nla_policy gact_policy[TCA_GACT_MAX + 1] = {
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[TCA_GACT_PARMS] = { .len = sizeof(struct tc_gact) },
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[TCA_GACT_PROB] = { .len = sizeof(struct tc_gact_p) },
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};
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2013-01-13 22:15:39 -07:00
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static int tcf_gact_init(struct net *net, struct nlattr *nla,
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2016-07-25 17:09:41 -06:00
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struct nlattr *est, struct tc_action **a,
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2018-02-15 08:54:56 -07:00
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int ovr, int bind, struct netlink_ext_ack *extack)
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2005-04-16 16:20:36 -06:00
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{
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2016-02-22 16:57:53 -07:00
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struct tc_action_net *tn = net_generic(net, gact_net_id);
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2008-01-22 23:11:50 -07:00
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struct nlattr *tb[TCA_GACT_MAX + 1];
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2005-04-16 16:20:36 -06:00
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struct tc_gact *parm;
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2006-08-22 00:54:55 -06:00
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struct tcf_gact *gact;
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2005-04-16 16:20:36 -06:00
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int ret = 0;
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2008-01-23 21:33:32 -07:00
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int err;
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2012-08-03 04:57:52 -06:00
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#ifdef CONFIG_GACT_PROB
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struct tc_gact_p *p_parm = NULL;
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#endif
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2005-04-16 16:20:36 -06:00
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2008-01-23 21:33:32 -07:00
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if (nla == NULL)
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2005-04-16 16:20:36 -06:00
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return -EINVAL;
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2017-04-12 06:34:07 -06:00
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err = nla_parse_nested(tb, TCA_GACT_MAX, nla, gact_policy, NULL);
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2008-01-23 21:33:32 -07:00
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if (err < 0)
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return err;
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2008-01-23 21:36:30 -07:00
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if (tb[TCA_GACT_PARMS] == NULL)
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2005-04-16 16:20:36 -06:00
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return -EINVAL;
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2008-01-22 23:11:50 -07:00
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parm = nla_data(tb[TCA_GACT_PARMS]);
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2005-04-16 16:20:36 -06:00
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2008-01-23 21:36:30 -07:00
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#ifndef CONFIG_GACT_PROB
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2008-01-22 23:11:50 -07:00
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if (tb[TCA_GACT_PROB] != NULL)
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2005-04-16 16:20:36 -06:00
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return -EOPNOTSUPP;
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2012-08-03 04:57:52 -06:00
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#else
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if (tb[TCA_GACT_PROB]) {
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p_parm = nla_data(tb[TCA_GACT_PROB]);
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if (p_parm->ptype >= MAX_RAND)
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return -EINVAL;
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}
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2005-04-16 16:20:36 -06:00
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#endif
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2017-08-30 00:31:59 -06:00
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if (!tcf_idr_check(tn, parm->index, a, bind)) {
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ret = tcf_idr_create(tn, parm->index, est, a,
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&act_gact_ops, bind, true);
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2014-02-11 18:07:31 -07:00
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if (ret)
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return ret;
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2005-04-16 16:20:36 -06:00
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ret = ACT_P_CREATED;
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} else {
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2013-12-23 06:02:11 -07:00
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if (bind)/* dont override defaults */
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return 0;
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2017-08-30 00:31:59 -06:00
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tcf_idr_release(*a, bind);
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2013-12-23 06:02:11 -07:00
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if (!ovr)
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2005-04-16 16:20:36 -06:00
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return -EEXIST;
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}
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2016-07-25 17:09:41 -06:00
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gact = to_gact(*a);
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2006-08-22 00:54:55 -06:00
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2015-07-06 06:18:08 -06:00
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ASSERT_RTNL();
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2006-08-22 00:54:55 -06:00
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gact->tcf_action = parm->action;
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2005-04-16 16:20:36 -06:00
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#ifdef CONFIG_GACT_PROB
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2012-08-03 04:57:52 -06:00
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if (p_parm) {
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2006-08-22 00:54:55 -06:00
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gact->tcfg_paction = p_parm->paction;
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2015-07-06 06:18:05 -06:00
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gact->tcfg_pval = max_t(u16, 1, p_parm->pval);
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/* Make sure tcfg_pval is written before tcfg_ptype
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* coupled with smp_rmb() in gact_net_rand() & gact_determ()
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*/
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smp_wmb();
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2006-08-22 00:54:55 -06:00
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gact->tcfg_ptype = p_parm->ptype;
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2005-04-16 16:20:36 -06:00
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}
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#endif
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if (ret == ACT_P_CREATED)
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2017-08-30 00:31:59 -06:00
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tcf_idr_insert(tn, *a);
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2005-04-16 16:20:36 -06:00
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return ret;
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}
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2011-07-05 17:25:42 -06:00
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static int tcf_gact(struct sk_buff *skb, const struct tc_action *a,
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struct tcf_result *res)
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2005-04-16 16:20:36 -06:00
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{
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2016-07-25 17:09:41 -06:00
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struct tcf_gact *gact = to_gact(a);
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2015-07-06 06:18:08 -06:00
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int action = READ_ONCE(gact->tcf_action);
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2005-04-16 16:20:36 -06:00
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#ifdef CONFIG_GACT_PROB
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2015-07-06 06:18:07 -06:00
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{
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u32 ptype = READ_ONCE(gact->tcfg_ptype);
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if (ptype)
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action = gact_rand[ptype](gact);
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}
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2005-04-16 16:20:36 -06:00
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#endif
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2015-07-06 06:18:08 -06:00
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bstats_cpu_update(this_cpu_ptr(gact->common.cpu_bstats), skb);
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2005-04-16 16:20:36 -06:00
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if (action == TC_ACT_SHOT)
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2015-07-06 06:18:08 -06:00
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qstats_drop_inc(this_cpu_ptr(gact->common.cpu_qstats));
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tcf_lastuse_update(&gact->tcf_tm);
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2005-04-16 16:20:36 -06:00
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return action;
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}
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2016-05-13 06:55:36 -06:00
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static void tcf_gact_stats_update(struct tc_action *a, u64 bytes, u32 packets,
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u64 lastuse)
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{
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2016-07-25 17:09:41 -06:00
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struct tcf_gact *gact = to_gact(a);
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2016-05-13 06:55:36 -06:00
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int action = READ_ONCE(gact->tcf_action);
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struct tcf_t *tm = &gact->tcf_tm;
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2016-09-18 06:45:33 -06:00
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_bstats_cpu_update(this_cpu_ptr(gact->common.cpu_bstats), bytes,
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packets);
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2016-05-13 06:55:36 -06:00
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if (action == TC_ACT_SHOT)
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this_cpu_ptr(gact->common.cpu_qstats)->drops += packets;
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2017-12-25 22:48:51 -07:00
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tm->lastuse = max_t(u64, tm->lastuse, lastuse);
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2016-05-13 06:55:36 -06:00
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}
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2016-06-05 08:41:32 -06:00
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static int tcf_gact_dump(struct sk_buff *skb, struct tc_action *a,
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int bind, int ref)
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2005-04-16 16:20:36 -06:00
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{
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2007-04-19 21:29:13 -06:00
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unsigned char *b = skb_tail_pointer(skb);
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2016-07-25 17:09:41 -06:00
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struct tcf_gact *gact = to_gact(a);
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2010-08-16 14:04:22 -06:00
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struct tc_gact opt = {
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.index = gact->tcf_index,
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.refcnt = gact->tcf_refcnt - ref,
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.bindcnt = gact->tcf_bindcnt - bind,
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.action = gact->tcf_action,
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};
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2005-04-16 16:20:36 -06:00
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struct tcf_t t;
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2012-03-29 03:11:39 -06:00
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if (nla_put(skb, TCA_GACT_PARMS, sizeof(opt), &opt))
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goto nla_put_failure;
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2005-04-16 16:20:36 -06:00
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#ifdef CONFIG_GACT_PROB
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2006-08-22 00:54:55 -06:00
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if (gact->tcfg_ptype) {
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2010-08-16 14:04:22 -06:00
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struct tc_gact_p p_opt = {
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.paction = gact->tcfg_paction,
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.pval = gact->tcfg_pval,
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.ptype = gact->tcfg_ptype,
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};
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2012-03-29 03:11:39 -06:00
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if (nla_put(skb, TCA_GACT_PROB, sizeof(p_opt), &p_opt))
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goto nla_put_failure;
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2005-04-16 16:20:36 -06:00
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}
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#endif
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2016-06-06 04:32:55 -06:00
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tcf_tm_dump(&t, &gact->tcf_tm);
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2016-04-26 02:06:18 -06:00
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if (nla_put_64bit(skb, TCA_GACT_TM, sizeof(t), &t, TCA_GACT_PAD))
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2012-03-29 03:11:39 -06:00
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goto nla_put_failure;
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2005-04-16 16:20:36 -06:00
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return skb->len;
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2008-01-22 23:11:50 -07:00
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nla_put_failure:
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2007-03-26 00:06:12 -06:00
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nlmsg_trim(skb, b);
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2005-04-16 16:20:36 -06:00
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return -1;
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}
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2016-02-22 16:57:53 -07:00
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static int tcf_gact_walker(struct net *net, struct sk_buff *skb,
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struct netlink_callback *cb, int type,
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2018-02-15 08:54:58 -07:00
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const struct tc_action_ops *ops,
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struct netlink_ext_ack *extack)
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2016-02-22 16:57:53 -07:00
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{
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struct tc_action_net *tn = net_generic(net, gact_net_id);
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2018-02-15 08:54:59 -07:00
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return tcf_generic_walker(tn, skb, cb, type, ops, extack);
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2016-02-22 16:57:53 -07:00
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}
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2018-02-15 08:54:57 -07:00
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static int tcf_gact_search(struct net *net, struct tc_action **a, u32 index,
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struct netlink_ext_ack *extack)
|
2016-02-22 16:57:53 -07:00
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{
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struct tc_action_net *tn = net_generic(net, gact_net_id);
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2017-08-30 00:31:59 -06:00
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return tcf_idr_search(tn, a, index);
|
2016-02-22 16:57:53 -07:00
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}
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2018-03-08 14:59:20 -07:00
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static size_t tcf_gact_get_fill_size(const struct tc_action *act)
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{
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size_t sz = nla_total_size(sizeof(struct tc_gact)); /* TCA_GACT_PARMS */
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#ifdef CONFIG_GACT_PROB
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if (to_gact(act)->tcfg_ptype)
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/* TCA_GACT_PROB */
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sz += nla_total_size(sizeof(struct tc_gact_p));
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#endif
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return sz;
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}
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|
2005-04-16 16:20:36 -06:00
|
|
|
static struct tc_action_ops act_gact_ops = {
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|
|
.kind = "gact",
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|
|
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.type = TCA_ACT_GACT,
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|
|
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.owner = THIS_MODULE,
|
|
|
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.act = tcf_gact,
|
2016-05-13 06:55:36 -06:00
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.stats_update = tcf_gact_stats_update,
|
2005-04-16 16:20:36 -06:00
|
|
|
.dump = tcf_gact_dump,
|
|
|
|
.init = tcf_gact_init,
|
2016-02-22 16:57:53 -07:00
|
|
|
.walk = tcf_gact_walker,
|
|
|
|
.lookup = tcf_gact_search,
|
2018-03-08 14:59:20 -07:00
|
|
|
.get_fill_size = tcf_gact_get_fill_size,
|
2016-07-25 17:09:41 -06:00
|
|
|
.size = sizeof(struct tcf_gact),
|
2016-02-22 16:57:53 -07:00
|
|
|
};
|
|
|
|
|
|
|
|
static __net_init int gact_init_net(struct net *net)
|
|
|
|
{
|
|
|
|
struct tc_action_net *tn = net_generic(net, gact_net_id);
|
|
|
|
|
2017-11-06 14:47:18 -07:00
|
|
|
return tc_action_net_init(tn, &act_gact_ops);
|
2016-02-22 16:57:53 -07:00
|
|
|
}
|
|
|
|
|
2017-12-11 16:35:03 -07:00
|
|
|
static void __net_exit gact_exit_net(struct list_head *net_list)
|
2016-02-22 16:57:53 -07:00
|
|
|
{
|
2017-12-11 16:35:03 -07:00
|
|
|
tc_action_net_exit(net_list, gact_net_id);
|
2016-02-22 16:57:53 -07:00
|
|
|
}
|
|
|
|
|
|
|
|
static struct pernet_operations gact_net_ops = {
|
|
|
|
.init = gact_init_net,
|
2017-12-11 16:35:03 -07:00
|
|
|
.exit_batch = gact_exit_net,
|
2016-02-22 16:57:53 -07:00
|
|
|
.id = &gact_net_id,
|
|
|
|
.size = sizeof(struct tc_action_net),
|
2005-04-16 16:20:36 -06:00
|
|
|
};
|
|
|
|
|
|
|
|
MODULE_AUTHOR("Jamal Hadi Salim(2002-4)");
|
|
|
|
MODULE_DESCRIPTION("Generic Classifier actions");
|
|
|
|
MODULE_LICENSE("GPL");
|
|
|
|
|
2006-08-22 00:54:55 -06:00
|
|
|
static int __init gact_init_module(void)
|
2005-04-16 16:20:36 -06:00
|
|
|
{
|
|
|
|
#ifdef CONFIG_GACT_PROB
|
2011-01-19 12:26:56 -07:00
|
|
|
pr_info("GACT probability on\n");
|
2005-04-16 16:20:36 -06:00
|
|
|
#else
|
2011-01-19 12:26:56 -07:00
|
|
|
pr_info("GACT probability NOT on\n");
|
2005-04-16 16:20:36 -06:00
|
|
|
#endif
|
2016-02-22 16:57:53 -07:00
|
|
|
|
|
|
|
return tcf_register_action(&act_gact_ops, &gact_net_ops);
|
2005-04-16 16:20:36 -06:00
|
|
|
}
|
|
|
|
|
2006-08-22 00:54:55 -06:00
|
|
|
static void __exit gact_cleanup_module(void)
|
2005-04-16 16:20:36 -06:00
|
|
|
{
|
2016-02-22 16:57:53 -07:00
|
|
|
tcf_unregister_action(&act_gact_ops, &gact_net_ops);
|
2005-04-16 16:20:36 -06:00
|
|
|
}
|
|
|
|
|
|
|
|
module_init(gact_init_module);
|
|
|
|
module_exit(gact_cleanup_module);
|