![WANG Cong](/assets/img/avatar_default.png)
struct tc_action is confusing, currently we use it for two purposes: 1) Pass in arguments and carry out results from helper functions 2) A generic representation for tc actions The first one is error-prone, since we need to make sure we don't miss anything. This patch aims to get rid of this use, by moving tc_action into tcf_common, so that they are allocated together in hashtable and can be cast'ed easily. And together with the following patch, we could really make tc_action a generic representation for all tc actions and each type of action can inherit from it. Cc: Jamal Hadi Salim <jhs@mojatatu.com> Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
261 lines
6.7 KiB
C
261 lines
6.7 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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#define SKBEDIT_TAB_MASK 15
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static 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->mark;
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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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};
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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;
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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);
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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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parm = nla_data(tb[TCA_SKBEDIT_PARMS]);
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exists = tcf_hash_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_hash_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_hash_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_hash_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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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_hash_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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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_hash_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, SKBEDIT_TAB_MASK);
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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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