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- // SPDX-License-Identifier: GPL-2.0-or-later
- /*
- * net/sched/act_police.c Input police filter
- *
- * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
- * J Hadi Salim (action changes)
- */
- #include <linux/module.h>
- #include <linux/types.h>
- #include <linux/kernel.h>
- #include <linux/string.h>
- #include <linux/errno.h>
- #include <linux/skbuff.h>
- #include <linux/rtnetlink.h>
- #include <linux/init.h>
- #include <linux/slab.h>
- #include <net/act_api.h>
- #include <net/netlink.h>
- #include <net/pkt_cls.h>
- #include <net/tc_act/tc_police.h>
- /* Each policer is serialized by its individual spinlock */
- static unsigned int police_net_id;
- static struct tc_action_ops act_police_ops;
- static int tcf_police_walker(struct net *net, struct sk_buff *skb,
- struct netlink_callback *cb, int type,
- const struct tc_action_ops *ops,
- struct netlink_ext_ack *extack)
- {
- struct tc_action_net *tn = net_generic(net, police_net_id);
- return tcf_generic_walker(tn, skb, cb, type, ops, extack);
- }
- static const struct nla_policy police_policy[TCA_POLICE_MAX + 1] = {
- [TCA_POLICE_RATE] = { .len = TC_RTAB_SIZE },
- [TCA_POLICE_PEAKRATE] = { .len = TC_RTAB_SIZE },
- [TCA_POLICE_AVRATE] = { .type = NLA_U32 },
- [TCA_POLICE_RESULT] = { .type = NLA_U32 },
- [TCA_POLICE_RATE64] = { .type = NLA_U64 },
- [TCA_POLICE_PEAKRATE64] = { .type = NLA_U64 },
- };
- static int tcf_police_init(struct net *net, struct nlattr *nla,
- struct nlattr *est, struct tc_action **a,
- int ovr, int bind, bool rtnl_held,
- struct tcf_proto *tp, u32 flags,
- struct netlink_ext_ack *extack)
- {
- int ret = 0, tcfp_result = TC_ACT_OK, err, size;
- struct nlattr *tb[TCA_POLICE_MAX + 1];
- struct tcf_chain *goto_ch = NULL;
- struct tc_police *parm;
- struct tcf_police *police;
- struct qdisc_rate_table *R_tab = NULL, *P_tab = NULL;
- struct tc_action_net *tn = net_generic(net, police_net_id);
- struct tcf_police_params *new;
- bool exists = false;
- u32 index;
- u64 rate64, prate64;
- if (nla == NULL)
- return -EINVAL;
- err = nla_parse_nested_deprecated(tb, TCA_POLICE_MAX, nla,
- police_policy, NULL);
- if (err < 0)
- return err;
- if (tb[TCA_POLICE_TBF] == NULL)
- return -EINVAL;
- size = nla_len(tb[TCA_POLICE_TBF]);
- if (size != sizeof(*parm) && size != sizeof(struct tc_police_compat))
- return -EINVAL;
- parm = nla_data(tb[TCA_POLICE_TBF]);
- index = parm->index;
- err = tcf_idr_check_alloc(tn, &index, a, bind);
- if (err < 0)
- return err;
- exists = err;
- if (exists && bind)
- return 0;
- if (!exists) {
- ret = tcf_idr_create(tn, index, NULL, a,
- &act_police_ops, bind, true, 0);
- if (ret) {
- tcf_idr_cleanup(tn, index);
- return ret;
- }
- ret = ACT_P_CREATED;
- spin_lock_init(&(to_police(*a)->tcfp_lock));
- } else if (!ovr) {
- tcf_idr_release(*a, bind);
- return -EEXIST;
- }
- err = tcf_action_check_ctrlact(parm->action, tp, &goto_ch, extack);
- if (err < 0)
- goto release_idr;
- police = to_police(*a);
- if (parm->rate.rate) {
- err = -ENOMEM;
- R_tab = qdisc_get_rtab(&parm->rate, tb[TCA_POLICE_RATE], NULL);
- if (R_tab == NULL)
- goto failure;
- if (parm->peakrate.rate) {
- P_tab = qdisc_get_rtab(&parm->peakrate,
- tb[TCA_POLICE_PEAKRATE], NULL);
- if (P_tab == NULL)
- goto failure;
- }
- }
- if (est) {
- err = gen_replace_estimator(&police->tcf_bstats,
- police->common.cpu_bstats,
- &police->tcf_rate_est,
- &police->tcf_lock,
- NULL, est);
- if (err)
- goto failure;
- } else if (tb[TCA_POLICE_AVRATE] &&
- (ret == ACT_P_CREATED ||
- !gen_estimator_active(&police->tcf_rate_est))) {
- err = -EINVAL;
- goto failure;
- }
- if (tb[TCA_POLICE_RESULT]) {
- tcfp_result = nla_get_u32(tb[TCA_POLICE_RESULT]);
- if (TC_ACT_EXT_CMP(tcfp_result, TC_ACT_GOTO_CHAIN)) {
- NL_SET_ERR_MSG(extack,
- "goto chain not allowed on fallback");
- err = -EINVAL;
- goto failure;
- }
- }
- new = kzalloc(sizeof(*new), GFP_KERNEL);
- if (unlikely(!new)) {
- err = -ENOMEM;
- goto failure;
- }
- /* No failure allowed after this point */
- new->tcfp_result = tcfp_result;
- new->tcfp_mtu = parm->mtu;
- if (!new->tcfp_mtu) {
- new->tcfp_mtu = ~0;
- if (R_tab)
- new->tcfp_mtu = 255 << R_tab->rate.cell_log;
- }
- if (R_tab) {
- new->rate_present = true;
- rate64 = tb[TCA_POLICE_RATE64] ?
- nla_get_u64(tb[TCA_POLICE_RATE64]) : 0;
- psched_ratecfg_precompute(&new->rate, &R_tab->rate, rate64);
- qdisc_put_rtab(R_tab);
- } else {
- new->rate_present = false;
- }
- if (P_tab) {
- new->peak_present = true;
- prate64 = tb[TCA_POLICE_PEAKRATE64] ?
- nla_get_u64(tb[TCA_POLICE_PEAKRATE64]) : 0;
- psched_ratecfg_precompute(&new->peak, &P_tab->rate, prate64);
- qdisc_put_rtab(P_tab);
- } else {
- new->peak_present = false;
- }
- new->tcfp_burst = PSCHED_TICKS2NS(parm->burst);
- if (new->peak_present)
- new->tcfp_mtu_ptoks = (s64)psched_l2t_ns(&new->peak,
- new->tcfp_mtu);
- if (tb[TCA_POLICE_AVRATE])
- new->tcfp_ewma_rate = nla_get_u32(tb[TCA_POLICE_AVRATE]);
- spin_lock_bh(&police->tcf_lock);
- spin_lock_bh(&police->tcfp_lock);
- police->tcfp_t_c = ktime_get_ns();
- police->tcfp_toks = new->tcfp_burst;
- if (new->peak_present)
- police->tcfp_ptoks = new->tcfp_mtu_ptoks;
- spin_unlock_bh(&police->tcfp_lock);
- goto_ch = tcf_action_set_ctrlact(*a, parm->action, goto_ch);
- new = rcu_replace_pointer(police->params,
- new,
- lockdep_is_held(&police->tcf_lock));
- spin_unlock_bh(&police->tcf_lock);
- if (goto_ch)
- tcf_chain_put_by_act(goto_ch);
- if (new)
- kfree_rcu(new, rcu);
- return ret;
- failure:
- qdisc_put_rtab(P_tab);
- qdisc_put_rtab(R_tab);
- if (goto_ch)
- tcf_chain_put_by_act(goto_ch);
- release_idr:
- tcf_idr_release(*a, bind);
- return err;
- }
- static int tcf_police_act(struct sk_buff *skb, const struct tc_action *a,
- struct tcf_result *res)
- {
- struct tcf_police *police = to_police(a);
- struct tcf_police_params *p;
- s64 now, toks, ptoks = 0;
- int ret;
- tcf_lastuse_update(&police->tcf_tm);
- bstats_cpu_update(this_cpu_ptr(police->common.cpu_bstats), skb);
- ret = READ_ONCE(police->tcf_action);
- p = rcu_dereference_bh(police->params);
- if (p->tcfp_ewma_rate) {
- struct gnet_stats_rate_est64 sample;
- if (!gen_estimator_read(&police->tcf_rate_est, &sample) ||
- sample.bps >= p->tcfp_ewma_rate)
- goto inc_overlimits;
- }
- if (qdisc_pkt_len(skb) <= p->tcfp_mtu) {
- if (!p->rate_present) {
- ret = p->tcfp_result;
- goto end;
- }
- now = ktime_get_ns();
- spin_lock_bh(&police->tcfp_lock);
- toks = min_t(s64, now - police->tcfp_t_c, p->tcfp_burst);
- if (p->peak_present) {
- ptoks = toks + police->tcfp_ptoks;
- if (ptoks > p->tcfp_mtu_ptoks)
- ptoks = p->tcfp_mtu_ptoks;
- ptoks -= (s64)psched_l2t_ns(&p->peak,
- qdisc_pkt_len(skb));
- }
- toks += police->tcfp_toks;
- if (toks > p->tcfp_burst)
- toks = p->tcfp_burst;
- toks -= (s64)psched_l2t_ns(&p->rate, qdisc_pkt_len(skb));
- if ((toks|ptoks) >= 0) {
- police->tcfp_t_c = now;
- police->tcfp_toks = toks;
- police->tcfp_ptoks = ptoks;
- spin_unlock_bh(&police->tcfp_lock);
- ret = p->tcfp_result;
- goto inc_drops;
- }
- spin_unlock_bh(&police->tcfp_lock);
- }
- inc_overlimits:
- qstats_overlimit_inc(this_cpu_ptr(police->common.cpu_qstats));
- inc_drops:
- if (ret == TC_ACT_SHOT)
- qstats_drop_inc(this_cpu_ptr(police->common.cpu_qstats));
- end:
- return ret;
- }
- static void tcf_police_cleanup(struct tc_action *a)
- {
- struct tcf_police *police = to_police(a);
- struct tcf_police_params *p;
- p = rcu_dereference_protected(police->params, 1);
- if (p)
- kfree_rcu(p, rcu);
- }
- static void tcf_police_stats_update(struct tc_action *a,
- u64 bytes, u64 packets, u64 drops,
- u64 lastuse, bool hw)
- {
- struct tcf_police *police = to_police(a);
- struct tcf_t *tm = &police->tcf_tm;
- tcf_action_update_stats(a, bytes, packets, drops, hw);
- tm->lastuse = max_t(u64, tm->lastuse, lastuse);
- }
- static int tcf_police_dump(struct sk_buff *skb, struct tc_action *a,
- int bind, int ref)
- {
- unsigned char *b = skb_tail_pointer(skb);
- struct tcf_police *police = to_police(a);
- struct tcf_police_params *p;
- struct tc_police opt = {
- .index = police->tcf_index,
- .refcnt = refcount_read(&police->tcf_refcnt) - ref,
- .bindcnt = atomic_read(&police->tcf_bindcnt) - bind,
- };
- struct tcf_t t;
- spin_lock_bh(&police->tcf_lock);
- opt.action = police->tcf_action;
- p = rcu_dereference_protected(police->params,
- lockdep_is_held(&police->tcf_lock));
- opt.mtu = p->tcfp_mtu;
- opt.burst = PSCHED_NS2TICKS(p->tcfp_burst);
- if (p->rate_present) {
- psched_ratecfg_getrate(&opt.rate, &p->rate);
- if ((police->params->rate.rate_bytes_ps >= (1ULL << 32)) &&
- nla_put_u64_64bit(skb, TCA_POLICE_RATE64,
- police->params->rate.rate_bytes_ps,
- TCA_POLICE_PAD))
- goto nla_put_failure;
- }
- if (p->peak_present) {
- psched_ratecfg_getrate(&opt.peakrate, &p->peak);
- if ((police->params->peak.rate_bytes_ps >= (1ULL << 32)) &&
- nla_put_u64_64bit(skb, TCA_POLICE_PEAKRATE64,
- police->params->peak.rate_bytes_ps,
- TCA_POLICE_PAD))
- goto nla_put_failure;
- }
- if (nla_put(skb, TCA_POLICE_TBF, sizeof(opt), &opt))
- goto nla_put_failure;
- if (p->tcfp_result &&
- nla_put_u32(skb, TCA_POLICE_RESULT, p->tcfp_result))
- goto nla_put_failure;
- if (p->tcfp_ewma_rate &&
- nla_put_u32(skb, TCA_POLICE_AVRATE, p->tcfp_ewma_rate))
- goto nla_put_failure;
- tcf_tm_dump(&t, &police->tcf_tm);
- if (nla_put_64bit(skb, TCA_POLICE_TM, sizeof(t), &t, TCA_POLICE_PAD))
- goto nla_put_failure;
- spin_unlock_bh(&police->tcf_lock);
- return skb->len;
- nla_put_failure:
- spin_unlock_bh(&police->tcf_lock);
- nlmsg_trim(skb, b);
- return -1;
- }
- static int tcf_police_search(struct net *net, struct tc_action **a, u32 index)
- {
- struct tc_action_net *tn = net_generic(net, police_net_id);
- return tcf_idr_search(tn, a, index);
- }
- 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,
- .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);
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