forked from Minki/linux
353 lines
9.5 KiB
C
353 lines
9.5 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 <net/ip.h>
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#include <net/ipv6.h>
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#include <net/dsfield.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_act(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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struct tcf_skbedit_params *params;
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int action;
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tcf_lastuse_update(&d->tcf_tm);
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bstats_cpu_update(this_cpu_ptr(d->common.cpu_bstats), skb);
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params = rcu_dereference_bh(d->params);
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action = READ_ONCE(d->tcf_action);
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if (params->flags & SKBEDIT_F_PRIORITY)
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skb->priority = params->priority;
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if (params->flags & SKBEDIT_F_INHERITDSFIELD) {
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int wlen = skb_network_offset(skb);
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switch (tc_skb_protocol(skb)) {
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case htons(ETH_P_IP):
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wlen += sizeof(struct iphdr);
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if (!pskb_may_pull(skb, wlen))
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goto err;
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skb->priority = ipv4_get_dsfield(ip_hdr(skb)) >> 2;
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break;
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case htons(ETH_P_IPV6):
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wlen += sizeof(struct ipv6hdr);
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if (!pskb_may_pull(skb, wlen))
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goto err;
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skb->priority = ipv6_get_dsfield(ipv6_hdr(skb)) >> 2;
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break;
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}
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}
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if (params->flags & SKBEDIT_F_QUEUE_MAPPING &&
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skb->dev->real_num_tx_queues > params->queue_mapping)
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skb_set_queue_mapping(skb, params->queue_mapping);
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if (params->flags & SKBEDIT_F_MARK) {
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skb->mark &= ~params->mask;
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skb->mark |= params->mark & params->mask;
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}
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if (params->flags & SKBEDIT_F_PTYPE)
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skb->pkt_type = params->ptype;
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return action;
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err:
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qstats_drop_inc(this_cpu_ptr(d->common.cpu_qstats));
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return TC_ACT_SHOT;
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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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[TCA_SKBEDIT_FLAGS] = { .len = sizeof(u64) },
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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, bool rtnl_held,
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struct netlink_ext_ack *extack)
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{
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struct tc_action_net *tn = net_generic(net, skbedit_net_id);
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struct tcf_skbedit_params *params_new;
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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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if (tb[TCA_SKBEDIT_FLAGS] != NULL) {
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u64 *pure_flags = nla_data(tb[TCA_SKBEDIT_FLAGS]);
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if (*pure_flags & SKBEDIT_F_INHERITDSFIELD)
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flags |= SKBEDIT_F_INHERITDSFIELD;
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}
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parm = nla_data(tb[TCA_SKBEDIT_PARMS]);
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err = tcf_idr_check_alloc(tn, &parm->index, a, bind);
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if (err < 0)
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return err;
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exists = err;
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if (exists && bind)
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return 0;
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if (!flags) {
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if (exists)
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tcf_idr_release(*a, bind);
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else
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tcf_idr_cleanup(tn, parm->index);
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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, true);
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if (ret) {
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tcf_idr_cleanup(tn, parm->index);
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return ret;
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}
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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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if (!ovr) {
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tcf_idr_release(*a, bind);
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return -EEXIST;
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}
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}
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params_new = kzalloc(sizeof(*params_new), GFP_KERNEL);
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if (unlikely(!params_new)) {
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tcf_idr_release(*a, bind);
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return -ENOMEM;
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}
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params_new->flags = flags;
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if (flags & SKBEDIT_F_PRIORITY)
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params_new->priority = *priority;
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if (flags & SKBEDIT_F_QUEUE_MAPPING)
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params_new->queue_mapping = *queue_mapping;
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if (flags & SKBEDIT_F_MARK)
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params_new->mark = *mark;
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if (flags & SKBEDIT_F_PTYPE)
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params_new->ptype = *ptype;
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/* default behaviour is to use all the bits */
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params_new->mask = 0xffffffff;
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if (flags & SKBEDIT_F_MASK)
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params_new->mask = *mask;
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spin_lock_bh(&d->tcf_lock);
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d->tcf_action = parm->action;
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rcu_swap_protected(d->params, params_new,
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lockdep_is_held(&d->tcf_lock));
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spin_unlock_bh(&d->tcf_lock);
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if (params_new)
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kfree_rcu(params_new, rcu);
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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 tcf_skbedit_params *params;
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struct tc_skbedit opt = {
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.index = d->tcf_index,
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.refcnt = refcount_read(&d->tcf_refcnt) - ref,
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.bindcnt = atomic_read(&d->tcf_bindcnt) - bind,
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};
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u64 pure_flags = 0;
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struct tcf_t t;
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spin_lock_bh(&d->tcf_lock);
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params = rcu_dereference_protected(d->params,
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lockdep_is_held(&d->tcf_lock));
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opt.action = d->tcf_action;
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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 ((params->flags & SKBEDIT_F_PRIORITY) &&
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nla_put_u32(skb, TCA_SKBEDIT_PRIORITY, params->priority))
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goto nla_put_failure;
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if ((params->flags & SKBEDIT_F_QUEUE_MAPPING) &&
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nla_put_u16(skb, TCA_SKBEDIT_QUEUE_MAPPING, params->queue_mapping))
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goto nla_put_failure;
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if ((params->flags & SKBEDIT_F_MARK) &&
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nla_put_u32(skb, TCA_SKBEDIT_MARK, params->mark))
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goto nla_put_failure;
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if ((params->flags & SKBEDIT_F_PTYPE) &&
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nla_put_u16(skb, TCA_SKBEDIT_PTYPE, params->ptype))
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goto nla_put_failure;
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if ((params->flags & SKBEDIT_F_MASK) &&
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nla_put_u32(skb, TCA_SKBEDIT_MASK, params->mask))
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goto nla_put_failure;
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if (params->flags & SKBEDIT_F_INHERITDSFIELD)
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pure_flags |= SKBEDIT_F_INHERITDSFIELD;
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if (pure_flags != 0 &&
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nla_put(skb, TCA_SKBEDIT_FLAGS, sizeof(pure_flags), &pure_flags))
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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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spin_unlock_bh(&d->tcf_lock);
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return skb->len;
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nla_put_failure:
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spin_unlock_bh(&d->tcf_lock);
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nlmsg_trim(skb, b);
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return -1;
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}
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static void tcf_skbedit_cleanup(struct tc_action *a)
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{
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struct tcf_skbedit *d = to_skbedit(a);
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struct tcf_skbedit_params *params;
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params = rcu_dereference_protected(d->params, 1);
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if (params)
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kfree_rcu(params, rcu);
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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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struct netlink_ext_ack *extack)
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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, extack);
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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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.id = TCA_ID_SKBEDIT,
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.owner = THIS_MODULE,
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.act = tcf_skbedit_act,
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.dump = tcf_skbedit_dump,
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.init = tcf_skbedit_init,
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.cleanup = tcf_skbedit_cleanup,
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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 list_head *net_list)
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{
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tc_action_net_exit(net_list, skbedit_net_id);
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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_batch = 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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