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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
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![Cong Wang](/assets/img/avatar_default.png)
This reverts commit ceffcc5e25
.
If we hold that refcnt, the netns can never be destroyed until
all actions are destroyed by user, this breaks our netns design
which we expect all actions are destroyed when we destroy the
whole netns.
Cc: Lucas Bates <lucasb@mojatatu.com>
Cc: Jamal Hadi Salim <jhs@mojatatu.com>
Cc: Jiri Pirko <jiri@resnulli.us>
Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
273 lines
7.1 KiB
C
273 lines
7.1 KiB
C
/*
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* Copyright (c) 2008, Intel Corporation.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License along with
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* this program; if not, see <http://www.gnu.org/licenses/>.
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*
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* Author: Alexander Duyck <alexander.h.duyck@intel.com>
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*/
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/skbuff.h>
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#include <linux/rtnetlink.h>
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#include <net/netlink.h>
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#include <net/pkt_sched.h>
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#include <linux/tc_act/tc_skbedit.h>
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#include <net/tc_act/tc_skbedit.h>
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static unsigned int skbedit_net_id;
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static struct tc_action_ops act_skbedit_ops;
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static int tcf_skbedit(struct sk_buff *skb, const struct tc_action *a,
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struct tcf_result *res)
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{
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struct tcf_skbedit *d = to_skbedit(a);
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spin_lock(&d->tcf_lock);
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tcf_lastuse_update(&d->tcf_tm);
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bstats_update(&d->tcf_bstats, skb);
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if (d->flags & SKBEDIT_F_PRIORITY)
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skb->priority = d->priority;
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if (d->flags & SKBEDIT_F_QUEUE_MAPPING &&
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skb->dev->real_num_tx_queues > d->queue_mapping)
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skb_set_queue_mapping(skb, d->queue_mapping);
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if (d->flags & SKBEDIT_F_MARK) {
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skb->mark &= ~d->mask;
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skb->mark |= d->mark & d->mask;
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}
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if (d->flags & SKBEDIT_F_PTYPE)
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skb->pkt_type = d->ptype;
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spin_unlock(&d->tcf_lock);
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return d->tcf_action;
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}
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static const struct nla_policy skbedit_policy[TCA_SKBEDIT_MAX + 1] = {
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[TCA_SKBEDIT_PARMS] = { .len = sizeof(struct tc_skbedit) },
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[TCA_SKBEDIT_PRIORITY] = { .len = sizeof(u32) },
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[TCA_SKBEDIT_QUEUE_MAPPING] = { .len = sizeof(u16) },
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[TCA_SKBEDIT_MARK] = { .len = sizeof(u32) },
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[TCA_SKBEDIT_PTYPE] = { .len = sizeof(u16) },
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[TCA_SKBEDIT_MASK] = { .len = sizeof(u32) },
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};
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static int tcf_skbedit_init(struct net *net, struct nlattr *nla,
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struct nlattr *est, struct tc_action **a,
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int ovr, int bind)
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{
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struct tc_action_net *tn = net_generic(net, skbedit_net_id);
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struct nlattr *tb[TCA_SKBEDIT_MAX + 1];
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struct tc_skbedit *parm;
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struct tcf_skbedit *d;
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u32 flags = 0, *priority = NULL, *mark = NULL, *mask = NULL;
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u16 *queue_mapping = NULL, *ptype = NULL;
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bool exists = false;
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int ret = 0, err;
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if (nla == NULL)
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return -EINVAL;
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err = nla_parse_nested(tb, TCA_SKBEDIT_MAX, nla, skbedit_policy, NULL);
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if (err < 0)
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return err;
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if (tb[TCA_SKBEDIT_PARMS] == NULL)
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return -EINVAL;
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if (tb[TCA_SKBEDIT_PRIORITY] != NULL) {
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flags |= SKBEDIT_F_PRIORITY;
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priority = nla_data(tb[TCA_SKBEDIT_PRIORITY]);
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}
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if (tb[TCA_SKBEDIT_QUEUE_MAPPING] != NULL) {
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flags |= SKBEDIT_F_QUEUE_MAPPING;
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queue_mapping = nla_data(tb[TCA_SKBEDIT_QUEUE_MAPPING]);
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}
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if (tb[TCA_SKBEDIT_PTYPE] != NULL) {
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ptype = nla_data(tb[TCA_SKBEDIT_PTYPE]);
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if (!skb_pkt_type_ok(*ptype))
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return -EINVAL;
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flags |= SKBEDIT_F_PTYPE;
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}
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if (tb[TCA_SKBEDIT_MARK] != NULL) {
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flags |= SKBEDIT_F_MARK;
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mark = nla_data(tb[TCA_SKBEDIT_MARK]);
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}
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if (tb[TCA_SKBEDIT_MASK] != NULL) {
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flags |= SKBEDIT_F_MASK;
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mask = nla_data(tb[TCA_SKBEDIT_MASK]);
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}
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parm = nla_data(tb[TCA_SKBEDIT_PARMS]);
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exists = tcf_idr_check(tn, parm->index, a, bind);
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if (exists && bind)
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return 0;
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if (!flags) {
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tcf_idr_release(*a, bind);
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return -EINVAL;
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}
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if (!exists) {
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ret = tcf_idr_create(tn, parm->index, est, a,
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&act_skbedit_ops, bind, false);
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if (ret)
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return ret;
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d = to_skbedit(*a);
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ret = ACT_P_CREATED;
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} else {
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d = to_skbedit(*a);
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tcf_idr_release(*a, bind);
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if (!ovr)
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return -EEXIST;
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}
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spin_lock_bh(&d->tcf_lock);
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d->flags = flags;
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if (flags & SKBEDIT_F_PRIORITY)
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d->priority = *priority;
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if (flags & SKBEDIT_F_QUEUE_MAPPING)
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d->queue_mapping = *queue_mapping;
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if (flags & SKBEDIT_F_MARK)
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d->mark = *mark;
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if (flags & SKBEDIT_F_PTYPE)
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d->ptype = *ptype;
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/* default behaviour is to use all the bits */
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d->mask = 0xffffffff;
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if (flags & SKBEDIT_F_MASK)
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d->mask = *mask;
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d->tcf_action = parm->action;
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spin_unlock_bh(&d->tcf_lock);
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if (ret == ACT_P_CREATED)
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tcf_idr_insert(tn, *a);
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return ret;
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}
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static int tcf_skbedit_dump(struct sk_buff *skb, struct tc_action *a,
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int bind, int ref)
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{
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unsigned char *b = skb_tail_pointer(skb);
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struct tcf_skbedit *d = to_skbedit(a);
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struct tc_skbedit opt = {
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.index = d->tcf_index,
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.refcnt = d->tcf_refcnt - ref,
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.bindcnt = d->tcf_bindcnt - bind,
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.action = d->tcf_action,
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};
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struct tcf_t t;
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if (nla_put(skb, TCA_SKBEDIT_PARMS, sizeof(opt), &opt))
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goto nla_put_failure;
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if ((d->flags & SKBEDIT_F_PRIORITY) &&
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nla_put_u32(skb, TCA_SKBEDIT_PRIORITY, d->priority))
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goto nla_put_failure;
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if ((d->flags & SKBEDIT_F_QUEUE_MAPPING) &&
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nla_put_u16(skb, TCA_SKBEDIT_QUEUE_MAPPING, d->queue_mapping))
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goto nla_put_failure;
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if ((d->flags & SKBEDIT_F_MARK) &&
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nla_put_u32(skb, TCA_SKBEDIT_MARK, d->mark))
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goto nla_put_failure;
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if ((d->flags & SKBEDIT_F_PTYPE) &&
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nla_put_u16(skb, TCA_SKBEDIT_PTYPE, d->ptype))
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goto nla_put_failure;
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if ((d->flags & SKBEDIT_F_MASK) &&
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nla_put_u32(skb, TCA_SKBEDIT_MASK, d->mask))
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goto nla_put_failure;
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tcf_tm_dump(&t, &d->tcf_tm);
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if (nla_put_64bit(skb, TCA_SKBEDIT_TM, sizeof(t), &t, TCA_SKBEDIT_PAD))
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goto nla_put_failure;
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return skb->len;
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nla_put_failure:
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nlmsg_trim(skb, b);
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return -1;
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}
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static int tcf_skbedit_walker(struct net *net, struct sk_buff *skb,
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struct netlink_callback *cb, int type,
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const struct tc_action_ops *ops)
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{
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struct tc_action_net *tn = net_generic(net, skbedit_net_id);
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return tcf_generic_walker(tn, skb, cb, type, ops);
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}
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static int tcf_skbedit_search(struct net *net, struct tc_action **a, u32 index)
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{
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struct tc_action_net *tn = net_generic(net, skbedit_net_id);
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return tcf_idr_search(tn, a, index);
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}
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static struct tc_action_ops act_skbedit_ops = {
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.kind = "skbedit",
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.type = TCA_ACT_SKBEDIT,
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.owner = THIS_MODULE,
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.act = tcf_skbedit,
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.dump = tcf_skbedit_dump,
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.init = tcf_skbedit_init,
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.walk = tcf_skbedit_walker,
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.lookup = tcf_skbedit_search,
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.size = sizeof(struct tcf_skbedit),
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};
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static __net_init int skbedit_init_net(struct net *net)
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{
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struct tc_action_net *tn = net_generic(net, skbedit_net_id);
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return tc_action_net_init(tn, &act_skbedit_ops);
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}
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static void __net_exit skbedit_exit_net(struct net *net)
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{
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struct tc_action_net *tn = net_generic(net, skbedit_net_id);
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tc_action_net_exit(tn);
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}
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static struct pernet_operations skbedit_net_ops = {
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.init = skbedit_init_net,
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.exit = skbedit_exit_net,
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.id = &skbedit_net_id,
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.size = sizeof(struct tc_action_net),
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};
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MODULE_AUTHOR("Alexander Duyck, <alexander.h.duyck@intel.com>");
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MODULE_DESCRIPTION("SKB Editing");
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MODULE_LICENSE("GPL");
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static int __init skbedit_init_module(void)
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{
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return tcf_register_action(&act_skbedit_ops, &skbedit_net_ops);
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}
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static void __exit skbedit_cleanup_module(void)
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{
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tcf_unregister_action(&act_skbedit_ops, &skbedit_net_ops);
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}
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module_init(skbedit_init_module);
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module_exit(skbedit_cleanup_module);
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