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- /*
- * net/sched/act_police.c Input police filter
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation; either version
- * 2 of the License, or (at your option) any later version.
- *
- * 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>
- struct tcf_police {
- struct tcf_common common;
- int tcfp_result;
- u32 tcfp_ewma_rate;
- s64 tcfp_burst;
- u32 tcfp_mtu;
- s64 tcfp_toks;
- s64 tcfp_ptoks;
- s64 tcfp_mtu_ptoks;
- s64 tcfp_t_c;
- struct psched_ratecfg rate;
- bool rate_present;
- struct psched_ratecfg peak;
- bool peak_present;
- };
- #define to_police(pc) \
- container_of(pc, struct tcf_police, common)
- #define POL_TAB_MASK 15
- /* old policer structure from before tc actions */
- struct tc_police_compat {
- u32 index;
- int action;
- u32 limit;
- u32 burst;
- u32 mtu;
- struct tc_ratespec rate;
- struct tc_ratespec peakrate;
- };
- /* Each policer is serialized by its individual spinlock */
- static int tcf_act_police_walker(struct sk_buff *skb, struct netlink_callback *cb,
- int type, struct tc_action *a)
- {
- struct tcf_hashinfo *hinfo = a->ops->hinfo;
- struct hlist_head *head;
- struct tcf_common *p;
- int err = 0, index = -1, i = 0, s_i = 0, n_i = 0;
- struct nlattr *nest;
- spin_lock_bh(&hinfo->lock);
- s_i = cb->args[0];
- for (i = 0; i < (POL_TAB_MASK + 1); i++) {
- head = &hinfo->htab[tcf_hash(i, POL_TAB_MASK)];
- hlist_for_each_entry_rcu(p, head, tcfc_head) {
- index++;
- if (index < s_i)
- continue;
- a->priv = p;
- a->order = index;
- nest = nla_nest_start(skb, a->order);
- if (nest == NULL)
- goto nla_put_failure;
- if (type == RTM_DELACTION)
- err = tcf_action_dump_1(skb, a, 0, 1);
- else
- err = tcf_action_dump_1(skb, a, 0, 0);
- if (err < 0) {
- index--;
- nla_nest_cancel(skb, nest);
- goto done;
- }
- nla_nest_end(skb, nest);
- n_i++;
- }
- }
- done:
- spin_unlock_bh(&hinfo->lock);
- if (n_i)
- cb->args[0] += n_i;
- return n_i;
- nla_put_failure:
- nla_nest_cancel(skb, nest);
- goto done;
- }
- 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 },
- };
- static int tcf_act_police_locate(struct net *net, struct nlattr *nla,
- struct nlattr *est, struct tc_action *a,
- int ovr, int bind)
- {
- unsigned int h;
- int ret = 0, err;
- struct nlattr *tb[TCA_POLICE_MAX + 1];
- struct tc_police *parm;
- struct tcf_police *police;
- struct qdisc_rate_table *R_tab = NULL, *P_tab = NULL;
- struct tcf_hashinfo *hinfo = a->ops->hinfo;
- int size;
- if (nla == NULL)
- return -EINVAL;
- err = nla_parse_nested(tb, TCA_POLICE_MAX, nla, police_policy);
- 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]);
- if (parm->index) {
- if (tcf_hash_search(a, parm->index)) {
- police = to_police(a->priv);
- if (bind) {
- police->tcf_bindcnt += 1;
- police->tcf_refcnt += 1;
- return 0;
- }
- if (ovr)
- goto override;
- /* not replacing */
- return -EEXIST;
- }
- }
- police = kzalloc(sizeof(*police), GFP_KERNEL);
- if (police == NULL)
- return -ENOMEM;
- ret = ACT_P_CREATED;
- police->tcf_refcnt = 1;
- spin_lock_init(&police->tcf_lock);
- if (bind)
- police->tcf_bindcnt = 1;
- override:
- if (parm->rate.rate) {
- err = -ENOMEM;
- R_tab = qdisc_get_rtab(&parm->rate, tb[TCA_POLICE_RATE]);
- if (R_tab == NULL)
- goto failure;
- if (parm->peakrate.rate) {
- P_tab = qdisc_get_rtab(&parm->peakrate,
- tb[TCA_POLICE_PEAKRATE]);
- if (P_tab == NULL)
- goto failure;
- }
- }
- spin_lock_bh(&police->tcf_lock);
- if (est) {
- err = gen_replace_estimator(&police->tcf_bstats, NULL,
- &police->tcf_rate_est,
- &police->tcf_lock, est);
- if (err)
- goto failure_unlock;
- } else if (tb[TCA_POLICE_AVRATE] &&
- (ret == ACT_P_CREATED ||
- !gen_estimator_active(&police->tcf_bstats,
- &police->tcf_rate_est))) {
- err = -EINVAL;
- goto failure_unlock;
- }
- /* No failure allowed after this point */
- police->tcfp_mtu = parm->mtu;
- if (police->tcfp_mtu == 0) {
- police->tcfp_mtu = ~0;
- if (R_tab)
- police->tcfp_mtu = 255 << R_tab->rate.cell_log;
- }
- if (R_tab) {
- police->rate_present = true;
- psched_ratecfg_precompute(&police->rate, &R_tab->rate, 0);
- qdisc_put_rtab(R_tab);
- } else {
- police->rate_present = false;
- }
- if (P_tab) {
- police->peak_present = true;
- psched_ratecfg_precompute(&police->peak, &P_tab->rate, 0);
- qdisc_put_rtab(P_tab);
- } else {
- police->peak_present = false;
- }
- if (tb[TCA_POLICE_RESULT])
- police->tcfp_result = nla_get_u32(tb[TCA_POLICE_RESULT]);
- police->tcfp_burst = PSCHED_TICKS2NS(parm->burst);
- police->tcfp_toks = police->tcfp_burst;
- if (police->peak_present) {
- police->tcfp_mtu_ptoks = (s64) psched_l2t_ns(&police->peak,
- police->tcfp_mtu);
- police->tcfp_ptoks = police->tcfp_mtu_ptoks;
- }
- police->tcf_action = parm->action;
- if (tb[TCA_POLICE_AVRATE])
- police->tcfp_ewma_rate = nla_get_u32(tb[TCA_POLICE_AVRATE]);
- spin_unlock_bh(&police->tcf_lock);
- if (ret != ACT_P_CREATED)
- return ret;
- police->tcfp_t_c = ktime_get_ns();
- police->tcf_index = parm->index ? parm->index :
- tcf_hash_new_index(hinfo);
- h = tcf_hash(police->tcf_index, POL_TAB_MASK);
- spin_lock_bh(&hinfo->lock);
- hlist_add_head(&police->tcf_head, &hinfo->htab[h]);
- spin_unlock_bh(&hinfo->lock);
- a->priv = police;
- return ret;
- failure_unlock:
- spin_unlock_bh(&police->tcf_lock);
- failure:
- qdisc_put_rtab(P_tab);
- qdisc_put_rtab(R_tab);
- if (ret == ACT_P_CREATED)
- kfree(police);
- return err;
- }
- static int tcf_act_police(struct sk_buff *skb, const struct tc_action *a,
- struct tcf_result *res)
- {
- struct tcf_police *police = a->priv;
- s64 now;
- s64 toks;
- s64 ptoks = 0;
- spin_lock(&police->tcf_lock);
- bstats_update(&police->tcf_bstats, skb);
- if (police->tcfp_ewma_rate &&
- police->tcf_rate_est.bps >= police->tcfp_ewma_rate) {
- police->tcf_qstats.overlimits++;
- if (police->tcf_action == TC_ACT_SHOT)
- police->tcf_qstats.drops++;
- spin_unlock(&police->tcf_lock);
- return police->tcf_action;
- }
- if (qdisc_pkt_len(skb) <= police->tcfp_mtu) {
- if (!police->rate_present) {
- spin_unlock(&police->tcf_lock);
- return police->tcfp_result;
- }
- now = ktime_get_ns();
- toks = min_t(s64, now - police->tcfp_t_c,
- police->tcfp_burst);
- if (police->peak_present) {
- ptoks = toks + police->tcfp_ptoks;
- if (ptoks > police->tcfp_mtu_ptoks)
- ptoks = police->tcfp_mtu_ptoks;
- ptoks -= (s64) psched_l2t_ns(&police->peak,
- qdisc_pkt_len(skb));
- }
- toks += police->tcfp_toks;
- if (toks > police->tcfp_burst)
- toks = police->tcfp_burst;
- toks -= (s64) psched_l2t_ns(&police->rate, qdisc_pkt_len(skb));
- if ((toks|ptoks) >= 0) {
- police->tcfp_t_c = now;
- police->tcfp_toks = toks;
- police->tcfp_ptoks = ptoks;
- spin_unlock(&police->tcf_lock);
- return police->tcfp_result;
- }
- }
- police->tcf_qstats.overlimits++;
- if (police->tcf_action == TC_ACT_SHOT)
- police->tcf_qstats.drops++;
- spin_unlock(&police->tcf_lock);
- return police->tcf_action;
- }
- static int
- tcf_act_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 = a->priv;
- struct tc_police opt = {
- .index = police->tcf_index,
- .action = police->tcf_action,
- .mtu = police->tcfp_mtu,
- .burst = PSCHED_NS2TICKS(police->tcfp_burst),
- .refcnt = police->tcf_refcnt - ref,
- .bindcnt = police->tcf_bindcnt - bind,
- };
- if (police->rate_present)
- psched_ratecfg_getrate(&opt.rate, &police->rate);
- if (police->peak_present)
- psched_ratecfg_getrate(&opt.peakrate, &police->peak);
- if (nla_put(skb, TCA_POLICE_TBF, sizeof(opt), &opt))
- goto nla_put_failure;
- if (police->tcfp_result &&
- nla_put_u32(skb, TCA_POLICE_RESULT, police->tcfp_result))
- goto nla_put_failure;
- if (police->tcfp_ewma_rate &&
- nla_put_u32(skb, TCA_POLICE_AVRATE, police->tcfp_ewma_rate))
- goto nla_put_failure;
- return skb->len;
- nla_put_failure:
- nlmsg_trim(skb, b);
- return -1;
- }
- MODULE_AUTHOR("Alexey Kuznetsov");
- MODULE_DESCRIPTION("Policing actions");
- MODULE_LICENSE("GPL");
- static struct tc_action_ops act_police_ops = {
- .kind = "police",
- .type = TCA_ID_POLICE,
- .owner = THIS_MODULE,
- .act = tcf_act_police,
- .dump = tcf_act_police_dump,
- .init = tcf_act_police_locate,
- .walk = tcf_act_police_walker
- };
- static int __init
- police_init_module(void)
- {
- return tcf_register_action(&act_police_ops, POL_TAB_MASK);
- }
- static void __exit
- police_cleanup_module(void)
- {
- tcf_unregister_action(&act_police_ops);
- }
- module_init(police_init_module);
- module_exit(police_cleanup_module);
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