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![Vlad Buslov](/assets/img/avatar_default.png)
Offloading police with action TC_ACT_UNSPEC was erroneously disabled even though it was supported by mlx5 matchall offload implementation, which didn't verify the action type but instead assumed that any single police action attached to matchall classifier is a 'continue' action. Lack of action type check made it non-obvious what mlx5 matchall implementation actually supports and caused implementers and reviewers of referenced commits to disallow it as a part of improved validation code. Fixes:b8cd5831c6
("net: flow_offload: add tc police action parameters") Fixes:b50e462bc2
("net/sched: act_police: Add extack messages for offload failure") Signed-off-by: Vlad Buslov <vladbu@nvidia.com> Reviewed-by: Ido Schimmel <idosch@nvidia.com> Tested-by: Ido Schimmel <idosch@nvidia.com> Signed-off-by: David S. Miller <davem@davemloft.net>
553 lines
15 KiB
C
553 lines
15 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* net/sched/act_police.c Input police filter
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*
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* Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
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* J Hadi Salim (action changes)
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*/
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#include <linux/module.h>
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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/init.h>
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#include <linux/slab.h>
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#include <net/act_api.h>
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#include <net/netlink.h>
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#include <net/pkt_cls.h>
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#include <net/tc_act/tc_police.h>
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/* Each policer is serialized by its individual spinlock */
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static unsigned int police_net_id;
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static struct tc_action_ops act_police_ops;
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static int tcf_police_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, police_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 const struct nla_policy police_policy[TCA_POLICE_MAX + 1] = {
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[TCA_POLICE_RATE] = { .len = TC_RTAB_SIZE },
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[TCA_POLICE_PEAKRATE] = { .len = TC_RTAB_SIZE },
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[TCA_POLICE_AVRATE] = { .type = NLA_U32 },
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[TCA_POLICE_RESULT] = { .type = NLA_U32 },
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[TCA_POLICE_RATE64] = { .type = NLA_U64 },
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[TCA_POLICE_PEAKRATE64] = { .type = NLA_U64 },
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[TCA_POLICE_PKTRATE64] = { .type = NLA_U64, .min = 1 },
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[TCA_POLICE_PKTBURST64] = { .type = NLA_U64, .min = 1 },
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};
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static int tcf_police_init(struct net *net, struct nlattr *nla,
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struct nlattr *est, struct tc_action **a,
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struct tcf_proto *tp, u32 flags,
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struct netlink_ext_ack *extack)
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{
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int ret = 0, tcfp_result = TC_ACT_OK, err, size;
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bool bind = flags & TCA_ACT_FLAGS_BIND;
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struct nlattr *tb[TCA_POLICE_MAX + 1];
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struct tcf_chain *goto_ch = NULL;
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struct tc_police *parm;
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struct tcf_police *police;
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struct qdisc_rate_table *R_tab = NULL, *P_tab = NULL;
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struct tc_action_net *tn = net_generic(net, police_net_id);
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struct tcf_police_params *new;
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bool exists = false;
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u32 index;
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u64 rate64, prate64;
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u64 pps, ppsburst;
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if (nla == NULL)
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return -EINVAL;
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err = nla_parse_nested_deprecated(tb, TCA_POLICE_MAX, nla,
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police_policy, NULL);
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if (err < 0)
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return err;
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if (tb[TCA_POLICE_TBF] == NULL)
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return -EINVAL;
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size = nla_len(tb[TCA_POLICE_TBF]);
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if (size != sizeof(*parm) && size != sizeof(struct tc_police_compat))
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return -EINVAL;
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parm = nla_data(tb[TCA_POLICE_TBF]);
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index = parm->index;
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err = tcf_idr_check_alloc(tn, &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 (!exists) {
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ret = tcf_idr_create(tn, index, NULL, a,
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&act_police_ops, bind, true, flags);
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if (ret) {
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tcf_idr_cleanup(tn, index);
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return ret;
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}
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ret = ACT_P_CREATED;
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spin_lock_init(&(to_police(*a)->tcfp_lock));
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} else if (!(flags & TCA_ACT_FLAGS_REPLACE)) {
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tcf_idr_release(*a, bind);
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return -EEXIST;
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}
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err = tcf_action_check_ctrlact(parm->action, tp, &goto_ch, extack);
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if (err < 0)
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goto release_idr;
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police = to_police(*a);
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if (parm->rate.rate) {
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err = -ENOMEM;
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R_tab = qdisc_get_rtab(&parm->rate, tb[TCA_POLICE_RATE], NULL);
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if (R_tab == NULL)
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goto failure;
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if (parm->peakrate.rate) {
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P_tab = qdisc_get_rtab(&parm->peakrate,
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tb[TCA_POLICE_PEAKRATE], NULL);
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if (P_tab == NULL)
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goto failure;
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}
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}
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if (est) {
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err = gen_replace_estimator(&police->tcf_bstats,
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police->common.cpu_bstats,
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&police->tcf_rate_est,
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&police->tcf_lock,
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false, est);
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if (err)
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goto failure;
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} else if (tb[TCA_POLICE_AVRATE] &&
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(ret == ACT_P_CREATED ||
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!gen_estimator_active(&police->tcf_rate_est))) {
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err = -EINVAL;
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goto failure;
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}
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if (tb[TCA_POLICE_RESULT]) {
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tcfp_result = nla_get_u32(tb[TCA_POLICE_RESULT]);
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if (TC_ACT_EXT_CMP(tcfp_result, TC_ACT_GOTO_CHAIN)) {
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NL_SET_ERR_MSG(extack,
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"goto chain not allowed on fallback");
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err = -EINVAL;
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goto failure;
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}
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}
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if ((tb[TCA_POLICE_PKTRATE64] && !tb[TCA_POLICE_PKTBURST64]) ||
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(!tb[TCA_POLICE_PKTRATE64] && tb[TCA_POLICE_PKTBURST64])) {
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NL_SET_ERR_MSG(extack,
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"Both or neither packet-per-second burst and rate must be provided");
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err = -EINVAL;
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goto failure;
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}
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if (tb[TCA_POLICE_PKTRATE64] && R_tab) {
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NL_SET_ERR_MSG(extack,
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"packet-per-second and byte-per-second rate limits not allowed in same action");
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err = -EINVAL;
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goto failure;
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}
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new = kzalloc(sizeof(*new), GFP_KERNEL);
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if (unlikely(!new)) {
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err = -ENOMEM;
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goto failure;
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}
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/* No failure allowed after this point */
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new->tcfp_result = tcfp_result;
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new->tcfp_mtu = parm->mtu;
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if (!new->tcfp_mtu) {
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new->tcfp_mtu = ~0;
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if (R_tab)
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new->tcfp_mtu = 255 << R_tab->rate.cell_log;
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}
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if (R_tab) {
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new->rate_present = true;
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rate64 = tb[TCA_POLICE_RATE64] ?
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nla_get_u64(tb[TCA_POLICE_RATE64]) : 0;
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psched_ratecfg_precompute(&new->rate, &R_tab->rate, rate64);
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qdisc_put_rtab(R_tab);
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} else {
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new->rate_present = false;
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}
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if (P_tab) {
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new->peak_present = true;
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prate64 = tb[TCA_POLICE_PEAKRATE64] ?
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nla_get_u64(tb[TCA_POLICE_PEAKRATE64]) : 0;
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psched_ratecfg_precompute(&new->peak, &P_tab->rate, prate64);
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qdisc_put_rtab(P_tab);
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} else {
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new->peak_present = false;
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}
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new->tcfp_burst = PSCHED_TICKS2NS(parm->burst);
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if (new->peak_present)
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new->tcfp_mtu_ptoks = (s64)psched_l2t_ns(&new->peak,
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new->tcfp_mtu);
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if (tb[TCA_POLICE_AVRATE])
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new->tcfp_ewma_rate = nla_get_u32(tb[TCA_POLICE_AVRATE]);
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if (tb[TCA_POLICE_PKTRATE64]) {
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pps = nla_get_u64(tb[TCA_POLICE_PKTRATE64]);
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ppsburst = nla_get_u64(tb[TCA_POLICE_PKTBURST64]);
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new->pps_present = true;
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new->tcfp_pkt_burst = PSCHED_TICKS2NS(ppsburst);
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psched_ppscfg_precompute(&new->ppsrate, pps);
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}
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spin_lock_bh(&police->tcf_lock);
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spin_lock_bh(&police->tcfp_lock);
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police->tcfp_t_c = ktime_get_ns();
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police->tcfp_toks = new->tcfp_burst;
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if (new->peak_present)
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police->tcfp_ptoks = new->tcfp_mtu_ptoks;
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spin_unlock_bh(&police->tcfp_lock);
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goto_ch = tcf_action_set_ctrlact(*a, parm->action, goto_ch);
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new = rcu_replace_pointer(police->params,
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new,
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lockdep_is_held(&police->tcf_lock));
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spin_unlock_bh(&police->tcf_lock);
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if (goto_ch)
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tcf_chain_put_by_act(goto_ch);
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if (new)
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kfree_rcu(new, rcu);
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return ret;
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failure:
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qdisc_put_rtab(P_tab);
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qdisc_put_rtab(R_tab);
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if (goto_ch)
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tcf_chain_put_by_act(goto_ch);
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release_idr:
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tcf_idr_release(*a, bind);
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return err;
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}
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static bool tcf_police_mtu_check(struct sk_buff *skb, u32 limit)
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{
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u32 len;
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if (skb_is_gso(skb))
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return skb_gso_validate_mac_len(skb, limit);
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len = qdisc_pkt_len(skb);
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if (skb_at_tc_ingress(skb))
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len += skb->mac_len;
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return len <= limit;
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}
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static int tcf_police_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_police *police = to_police(a);
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s64 now, toks, ppstoks = 0, ptoks = 0;
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struct tcf_police_params *p;
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int ret;
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tcf_lastuse_update(&police->tcf_tm);
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bstats_update(this_cpu_ptr(police->common.cpu_bstats), skb);
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ret = READ_ONCE(police->tcf_action);
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p = rcu_dereference_bh(police->params);
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if (p->tcfp_ewma_rate) {
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struct gnet_stats_rate_est64 sample;
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if (!gen_estimator_read(&police->tcf_rate_est, &sample) ||
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sample.bps >= p->tcfp_ewma_rate)
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goto inc_overlimits;
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}
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if (tcf_police_mtu_check(skb, p->tcfp_mtu)) {
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if (!p->rate_present && !p->pps_present) {
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ret = p->tcfp_result;
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goto end;
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}
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now = ktime_get_ns();
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spin_lock_bh(&police->tcfp_lock);
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toks = min_t(s64, now - police->tcfp_t_c, p->tcfp_burst);
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if (p->peak_present) {
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ptoks = toks + police->tcfp_ptoks;
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if (ptoks > p->tcfp_mtu_ptoks)
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ptoks = p->tcfp_mtu_ptoks;
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ptoks -= (s64)psched_l2t_ns(&p->peak,
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qdisc_pkt_len(skb));
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}
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if (p->rate_present) {
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toks += police->tcfp_toks;
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if (toks > p->tcfp_burst)
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toks = p->tcfp_burst;
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toks -= (s64)psched_l2t_ns(&p->rate, qdisc_pkt_len(skb));
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} else if (p->pps_present) {
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ppstoks = min_t(s64, now - police->tcfp_t_c, p->tcfp_pkt_burst);
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ppstoks += police->tcfp_pkttoks;
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if (ppstoks > p->tcfp_pkt_burst)
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ppstoks = p->tcfp_pkt_burst;
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ppstoks -= (s64)psched_pkt2t_ns(&p->ppsrate, 1);
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}
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if ((toks | ptoks | ppstoks) >= 0) {
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police->tcfp_t_c = now;
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police->tcfp_toks = toks;
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police->tcfp_ptoks = ptoks;
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police->tcfp_pkttoks = ppstoks;
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spin_unlock_bh(&police->tcfp_lock);
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ret = p->tcfp_result;
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goto inc_drops;
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}
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spin_unlock_bh(&police->tcfp_lock);
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}
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inc_overlimits:
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qstats_overlimit_inc(this_cpu_ptr(police->common.cpu_qstats));
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inc_drops:
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if (ret == TC_ACT_SHOT)
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qstats_drop_inc(this_cpu_ptr(police->common.cpu_qstats));
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end:
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return ret;
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}
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static void tcf_police_cleanup(struct tc_action *a)
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{
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struct tcf_police *police = to_police(a);
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struct tcf_police_params *p;
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p = rcu_dereference_protected(police->params, 1);
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if (p)
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kfree_rcu(p, rcu);
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}
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static void tcf_police_stats_update(struct tc_action *a,
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u64 bytes, u64 packets, u64 drops,
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u64 lastuse, bool hw)
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{
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struct tcf_police *police = to_police(a);
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struct tcf_t *tm = &police->tcf_tm;
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tcf_action_update_stats(a, bytes, packets, drops, hw);
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tm->lastuse = max_t(u64, tm->lastuse, lastuse);
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}
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static int tcf_police_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_police *police = to_police(a);
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struct tcf_police_params *p;
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struct tc_police opt = {
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.index = police->tcf_index,
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.refcnt = refcount_read(&police->tcf_refcnt) - ref,
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.bindcnt = atomic_read(&police->tcf_bindcnt) - bind,
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};
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struct tcf_t t;
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spin_lock_bh(&police->tcf_lock);
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opt.action = police->tcf_action;
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p = rcu_dereference_protected(police->params,
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lockdep_is_held(&police->tcf_lock));
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opt.mtu = p->tcfp_mtu;
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opt.burst = PSCHED_NS2TICKS(p->tcfp_burst);
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if (p->rate_present) {
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psched_ratecfg_getrate(&opt.rate, &p->rate);
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if ((police->params->rate.rate_bytes_ps >= (1ULL << 32)) &&
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nla_put_u64_64bit(skb, TCA_POLICE_RATE64,
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police->params->rate.rate_bytes_ps,
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TCA_POLICE_PAD))
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goto nla_put_failure;
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}
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if (p->peak_present) {
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psched_ratecfg_getrate(&opt.peakrate, &p->peak);
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if ((police->params->peak.rate_bytes_ps >= (1ULL << 32)) &&
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nla_put_u64_64bit(skb, TCA_POLICE_PEAKRATE64,
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police->params->peak.rate_bytes_ps,
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TCA_POLICE_PAD))
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goto nla_put_failure;
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}
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if (p->pps_present) {
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if (nla_put_u64_64bit(skb, TCA_POLICE_PKTRATE64,
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police->params->ppsrate.rate_pkts_ps,
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TCA_POLICE_PAD))
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goto nla_put_failure;
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if (nla_put_u64_64bit(skb, TCA_POLICE_PKTBURST64,
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PSCHED_NS2TICKS(p->tcfp_pkt_burst),
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TCA_POLICE_PAD))
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goto nla_put_failure;
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}
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if (nla_put(skb, TCA_POLICE_TBF, sizeof(opt), &opt))
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goto nla_put_failure;
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if (p->tcfp_result &&
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nla_put_u32(skb, TCA_POLICE_RESULT, p->tcfp_result))
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goto nla_put_failure;
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if (p->tcfp_ewma_rate &&
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nla_put_u32(skb, TCA_POLICE_AVRATE, p->tcfp_ewma_rate))
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goto nla_put_failure;
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tcf_tm_dump(&t, &police->tcf_tm);
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if (nla_put_64bit(skb, TCA_POLICE_TM, sizeof(t), &t, TCA_POLICE_PAD))
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goto nla_put_failure;
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spin_unlock_bh(&police->tcf_lock);
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return skb->len;
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nla_put_failure:
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spin_unlock_bh(&police->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 int tcf_police_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, police_net_id);
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return tcf_idr_search(tn, a, index);
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}
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static int tcf_police_act_to_flow_act(int tc_act, u32 *extval,
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struct netlink_ext_ack *extack)
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{
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int act_id = -EOPNOTSUPP;
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if (!TC_ACT_EXT_OPCODE(tc_act)) {
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if (tc_act == TC_ACT_OK)
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act_id = FLOW_ACTION_ACCEPT;
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else if (tc_act == TC_ACT_SHOT)
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act_id = FLOW_ACTION_DROP;
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else if (tc_act == TC_ACT_PIPE)
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act_id = FLOW_ACTION_PIPE;
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|
else if (tc_act == TC_ACT_RECLASSIFY)
|
|
NL_SET_ERR_MSG_MOD(extack, "Offload not supported when conform/exceed action is \"reclassify\"");
|
|
else
|
|
NL_SET_ERR_MSG_MOD(extack, "Unsupported conform/exceed action offload");
|
|
} else if (TC_ACT_EXT_CMP(tc_act, TC_ACT_GOTO_CHAIN)) {
|
|
act_id = FLOW_ACTION_GOTO;
|
|
*extval = tc_act & TC_ACT_EXT_VAL_MASK;
|
|
} else if (TC_ACT_EXT_CMP(tc_act, TC_ACT_JUMP)) {
|
|
act_id = FLOW_ACTION_JUMP;
|
|
*extval = tc_act & TC_ACT_EXT_VAL_MASK;
|
|
} else if (tc_act == TC_ACT_UNSPEC) {
|
|
act_id = FLOW_ACTION_CONTINUE;
|
|
} else {
|
|
NL_SET_ERR_MSG_MOD(extack, "Unsupported conform/exceed action offload");
|
|
}
|
|
|
|
return act_id;
|
|
}
|
|
|
|
static int tcf_police_offload_act_setup(struct tc_action *act, void *entry_data,
|
|
u32 *index_inc, bool bind,
|
|
struct netlink_ext_ack *extack)
|
|
{
|
|
if (bind) {
|
|
struct flow_action_entry *entry = entry_data;
|
|
struct tcf_police *police = to_police(act);
|
|
struct tcf_police_params *p;
|
|
int act_id;
|
|
|
|
p = rcu_dereference_protected(police->params,
|
|
lockdep_is_held(&police->tcf_lock));
|
|
|
|
entry->id = FLOW_ACTION_POLICE;
|
|
entry->police.burst = tcf_police_burst(act);
|
|
entry->police.rate_bytes_ps =
|
|
tcf_police_rate_bytes_ps(act);
|
|
entry->police.peakrate_bytes_ps = tcf_police_peakrate_bytes_ps(act);
|
|
entry->police.avrate = tcf_police_tcfp_ewma_rate(act);
|
|
entry->police.overhead = tcf_police_rate_overhead(act);
|
|
entry->police.burst_pkt = tcf_police_burst_pkt(act);
|
|
entry->police.rate_pkt_ps =
|
|
tcf_police_rate_pkt_ps(act);
|
|
entry->police.mtu = tcf_police_tcfp_mtu(act);
|
|
|
|
act_id = tcf_police_act_to_flow_act(police->tcf_action,
|
|
&entry->police.exceed.extval,
|
|
extack);
|
|
if (act_id < 0)
|
|
return act_id;
|
|
|
|
entry->police.exceed.act_id = act_id;
|
|
|
|
act_id = tcf_police_act_to_flow_act(p->tcfp_result,
|
|
&entry->police.notexceed.extval,
|
|
extack);
|
|
if (act_id < 0)
|
|
return act_id;
|
|
|
|
entry->police.notexceed.act_id = act_id;
|
|
|
|
*index_inc = 1;
|
|
} else {
|
|
struct flow_offload_action *fl_action = entry_data;
|
|
|
|
fl_action->id = FLOW_ACTION_POLICE;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
MODULE_AUTHOR("Alexey Kuznetsov");
|
|
MODULE_DESCRIPTION("Policing actions");
|
|
MODULE_LICENSE("GPL");
|
|
|
|
static struct tc_action_ops act_police_ops = {
|
|
.kind = "police",
|
|
.id = TCA_ID_POLICE,
|
|
.owner = THIS_MODULE,
|
|
.stats_update = tcf_police_stats_update,
|
|
.act = tcf_police_act,
|
|
.dump = tcf_police_dump,
|
|
.init = tcf_police_init,
|
|
.walk = tcf_police_walker,
|
|
.lookup = tcf_police_search,
|
|
.cleanup = tcf_police_cleanup,
|
|
.offload_act_setup = tcf_police_offload_act_setup,
|
|
.size = sizeof(struct tcf_police),
|
|
};
|
|
|
|
static __net_init int police_init_net(struct net *net)
|
|
{
|
|
struct tc_action_net *tn = net_generic(net, police_net_id);
|
|
|
|
return tc_action_net_init(net, tn, &act_police_ops);
|
|
}
|
|
|
|
static void __net_exit police_exit_net(struct list_head *net_list)
|
|
{
|
|
tc_action_net_exit(net_list, police_net_id);
|
|
}
|
|
|
|
static struct pernet_operations police_net_ops = {
|
|
.init = police_init_net,
|
|
.exit_batch = police_exit_net,
|
|
.id = &police_net_id,
|
|
.size = sizeof(struct tc_action_net),
|
|
};
|
|
|
|
static int __init police_init_module(void)
|
|
{
|
|
return tcf_register_action(&act_police_ops, &police_net_ops);
|
|
}
|
|
|
|
static void __exit police_cleanup_module(void)
|
|
{
|
|
tcf_unregister_action(&act_police_ops, &police_net_ops);
|
|
}
|
|
|
|
module_init(police_init_module);
|
|
module_exit(police_cleanup_module);
|