![Linus Torvalds](/assets/img/avatar_default.png)
Pull RCU updates from Ingo Molnar: "The main changes in this cycle were: - Dynamic tick (nohz) updates, perhaps most notably changes to force the tick on when needed due to lengthy in-kernel execution on CPUs on which RCU is waiting. - Linux-kernel memory consistency model updates. - Replace rcu_swap_protected() with rcu_prepace_pointer(). - Torture-test updates. - Documentation updates. - Miscellaneous fixes" * 'core-rcu-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (51 commits) security/safesetid: Replace rcu_swap_protected() with rcu_replace_pointer() net/sched: Replace rcu_swap_protected() with rcu_replace_pointer() net/netfilter: Replace rcu_swap_protected() with rcu_replace_pointer() net/core: Replace rcu_swap_protected() with rcu_replace_pointer() bpf/cgroup: Replace rcu_swap_protected() with rcu_replace_pointer() fs/afs: Replace rcu_swap_protected() with rcu_replace_pointer() drivers/scsi: Replace rcu_swap_protected() with rcu_replace_pointer() drm/i915: Replace rcu_swap_protected() with rcu_replace_pointer() x86/kvm/pmu: Replace rcu_swap_protected() with rcu_replace_pointer() rcu: Upgrade rcu_swap_protected() to rcu_replace_pointer() rcu: Suppress levelspread uninitialized messages rcu: Fix uninitialized variable in nocb_gp_wait() rcu: Update descriptions for rcu_future_grace_period tracepoint rcu: Update descriptions for rcu_nocb_wake tracepoint rcu: Remove obsolete descriptions for rcu_barrier tracepoint rcu: Ensure that ->rcu_urgent_qs is set before resched IPI workqueue: Convert for_each_wq to use built-in list check rcu: Several rcu_segcblist functions can be static rcu: Remove unused function hlist_bl_del_init_rcu() Documentation: Rename rcu_node_context_switch() to rcu_note_context_switch() ...
414 lines
11 KiB
C
414 lines
11 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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};
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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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int ovr, int bind, bool rtnl_held,
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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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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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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, 0);
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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 (!ovr) {
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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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NULL, 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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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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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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if (ret == ACT_P_CREATED)
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tcf_idr_insert(tn, *a);
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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 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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struct tcf_police_params *p;
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s64 now, toks, ptoks = 0;
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int ret;
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tcf_lastuse_update(&police->tcf_tm);
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bstats_cpu_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 (qdisc_pkt_len(skb) <= p->tcfp_mtu) {
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if (!p->rate_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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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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if ((toks|ptoks) >= 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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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, u32 packets,
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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, false, 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 (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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MODULE_AUTHOR("Alexey Kuznetsov");
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MODULE_DESCRIPTION("Policing actions");
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MODULE_LICENSE("GPL");
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static struct tc_action_ops act_police_ops = {
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.kind = "police",
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.id = TCA_ID_POLICE,
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.owner = THIS_MODULE,
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.stats_update = tcf_police_stats_update,
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.act = tcf_police_act,
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.dump = tcf_police_dump,
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.init = tcf_police_init,
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.walk = tcf_police_walker,
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.lookup = tcf_police_search,
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.cleanup = tcf_police_cleanup,
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.size = sizeof(struct tcf_police),
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};
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static __net_init int police_init_net(struct net *net)
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{
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struct tc_action_net *tn = net_generic(net, police_net_id);
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return tc_action_net_init(net, tn, &act_police_ops);
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}
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static void __net_exit police_exit_net(struct list_head *net_list)
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{
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tc_action_net_exit(net_list, police_net_id);
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}
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static struct pernet_operations police_net_ops = {
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.init = police_init_net,
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.exit_batch = police_exit_net,
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.id = &police_net_id,
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.size = sizeof(struct tc_action_net),
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};
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static int __init police_init_module(void)
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{
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return tcf_register_action(&act_police_ops, &police_net_ops);
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}
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static void __exit police_cleanup_module(void)
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{
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tcf_unregister_action(&act_police_ops, &police_net_ops);
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}
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module_init(police_init_module);
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module_exit(police_cleanup_module);
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