zte's code,first commit
Change-Id: I9a04da59e459a9bc0d67f101f700d9d7dc8d681b
diff --git a/ap/os/linux/linux-3.4.x/net/sched/act_police.c b/ap/os/linux/linux-3.4.x/net/sched/act_police.c
new file mode 100644
index 0000000..6fb3f5a
--- /dev/null
+++ b/ap/os/linux/linux-3.4.x/net/sched/act_police.c
@@ -0,0 +1,402 @@
+/*
+ * net/sched/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>
+
+#define L2T(p, L) qdisc_l2t((p)->tcfp_R_tab, L)
+#define L2T_P(p, L) qdisc_l2t((p)->tcfp_P_tab, L)
+
+#define POL_TAB_MASK 15
+static struct tcf_common *tcf_police_ht[POL_TAB_MASK + 1];
+static u32 police_idx_gen;
+static DEFINE_RWLOCK(police_lock);
+
+static struct tcf_hashinfo police_hash_info = {
+ .htab = tcf_police_ht,
+ .hmask = POL_TAB_MASK,
+ .lock = &police_lock,
+};
+
+/* 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_common *p;
+ int err = 0, index = -1, i = 0, s_i = 0, n_i = 0;
+ struct nlattr *nest;
+
+ read_lock_bh(&police_lock);
+
+ s_i = cb->args[0];
+
+ for (i = 0; i < (POL_TAB_MASK + 1); i++) {
+ p = tcf_police_ht[tcf_hash(i, POL_TAB_MASK)];
+
+ for (; p; p = p->tcfc_next) {
+ 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:
+ read_unlock_bh(&police_lock);
+ if (n_i)
+ cb->args[0] += n_i;
+ return n_i;
+
+nla_put_failure:
+ nla_nest_cancel(skb, nest);
+ goto done;
+}
+
+static void tcf_police_destroy(struct tcf_police *p)
+{
+ unsigned int h = tcf_hash(p->tcf_index, POL_TAB_MASK);
+ struct tcf_common **p1p;
+
+ for (p1p = &tcf_police_ht[h]; *p1p; p1p = &(*p1p)->tcfc_next) {
+ if (*p1p == &p->common) {
+ write_lock_bh(&police_lock);
+ *p1p = p->tcf_next;
+ write_unlock_bh(&police_lock);
+ gen_kill_estimator(&p->tcf_bstats,
+ &p->tcf_rate_est);
+ if (p->tcfp_R_tab)
+ qdisc_put_rtab(p->tcfp_R_tab);
+ if (p->tcfp_P_tab)
+ qdisc_put_rtab(p->tcfp_P_tab);
+ /*
+ * gen_estimator est_timer() might access p->tcf_lock
+ * or bstats, wait a RCU grace period before freeing p
+ */
+ kfree_rcu(p, tcf_rcu);
+ return;
+ }
+ }
+ WARN_ON(1);
+}
+
+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 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;
+ 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) {
+ struct tcf_common *pc;
+
+ pc = tcf_hash_lookup(parm->index, &police_hash_info);
+ if (pc != NULL) {
+ a->priv = pc;
+ police = to_police(pc);
+ if (bind) {
+ police->tcf_bindcnt += 1;
+ police->tcf_refcnt += 1;
+ }
+ if (ovr)
+ goto override;
+ return ret;
+ }
+ }
+
+ 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,
+ &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 */
+ if (R_tab != NULL) {
+ qdisc_put_rtab(police->tcfp_R_tab);
+ police->tcfp_R_tab = R_tab;
+ }
+ if (P_tab != NULL) {
+ qdisc_put_rtab(police->tcfp_P_tab);
+ police->tcfp_P_tab = P_tab;
+ }
+
+ if (tb[TCA_POLICE_RESULT])
+ police->tcfp_result = nla_get_u32(tb[TCA_POLICE_RESULT]);
+ police->tcfp_toks = police->tcfp_burst = parm->burst;
+ police->tcfp_mtu = parm->mtu;
+ if (police->tcfp_mtu == 0) {
+ police->tcfp_mtu = ~0;
+ if (police->tcfp_R_tab)
+ police->tcfp_mtu = 255<<police->tcfp_R_tab->rate.cell_log;
+ }
+ if (police->tcfp_P_tab)
+ police->tcfp_ptoks = L2T_P(police, police->tcfp_mtu);
+ 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 = psched_get_time();
+ police->tcf_index = parm->index ? parm->index :
+ tcf_hash_new_index(&police_idx_gen, &police_hash_info);
+ h = tcf_hash(police->tcf_index, POL_TAB_MASK);
+ write_lock_bh(&police_lock);
+ police->tcf_next = tcf_police_ht[h];
+ tcf_police_ht[h] = &police->common;
+ write_unlock_bh(&police_lock);
+
+ a->priv = police;
+ return ret;
+
+failure_unlock:
+ spin_unlock_bh(&police->tcf_lock);
+failure:
+ if (P_tab)
+ qdisc_put_rtab(P_tab);
+ if (R_tab)
+ qdisc_put_rtab(R_tab);
+ if (ret == ACT_P_CREATED)
+ kfree(police);
+ return err;
+}
+
+static int tcf_act_police_cleanup(struct tc_action *a, int bind)
+{
+ struct tcf_police *p = a->priv;
+ int ret = 0;
+
+ if (p != NULL) {
+ if (bind)
+ p->tcf_bindcnt--;
+
+ p->tcf_refcnt--;
+ if (p->tcf_refcnt <= 0 && !p->tcf_bindcnt) {
+ tcf_police_destroy(p);
+ ret = 1;
+ }
+ }
+ return ret;
+}
+
+static int tcf_act_police(struct sk_buff *skb, const struct tc_action *a,
+ struct tcf_result *res)
+{
+ struct tcf_police *police = a->priv;
+ psched_time_t now;
+ long toks;
+ long 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->tcfp_R_tab == NULL) {
+ spin_unlock(&police->tcf_lock);
+ return police->tcfp_result;
+ }
+
+ now = psched_get_time();
+ toks = psched_tdiff_bounded(now, police->tcfp_t_c,
+ police->tcfp_burst);
+ if (police->tcfp_P_tab) {
+ ptoks = toks + police->tcfp_ptoks;
+ if (ptoks > (long)L2T_P(police, police->tcfp_mtu))
+ ptoks = (long)L2T_P(police, police->tcfp_mtu);
+ ptoks -= L2T_P(police, qdisc_pkt_len(skb));
+ }
+ toks += police->tcfp_toks;
+ if (toks > (long)police->tcfp_burst)
+ toks = police->tcfp_burst;
+ toks -= L2T(police, 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 = police->tcfp_burst,
+ .refcnt = police->tcf_refcnt - ref,
+ .bindcnt = police->tcf_bindcnt - bind,
+ };
+
+ if (police->tcfp_R_tab)
+ opt.rate = police->tcfp_R_tab->rate;
+ if (police->tcfp_P_tab)
+ opt.peakrate = police->tcfp_P_tab->rate;
+ NLA_PUT(skb, TCA_POLICE_TBF, sizeof(opt), &opt);
+ if (police->tcfp_result)
+ NLA_PUT_U32(skb, TCA_POLICE_RESULT, police->tcfp_result);
+ if (police->tcfp_ewma_rate)
+ NLA_PUT_U32(skb, TCA_POLICE_AVRATE, police->tcfp_ewma_rate);
+ 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",
+ .hinfo = &police_hash_info,
+ .type = TCA_ID_POLICE,
+ .capab = TCA_CAP_NONE,
+ .owner = THIS_MODULE,
+ .act = tcf_act_police,
+ .dump = tcf_act_police_dump,
+ .cleanup = tcf_act_police_cleanup,
+ .lookup = tcf_hash_search,
+ .init = tcf_act_police_locate,
+ .walk = tcf_act_police_walker
+};
+
+static int __init
+police_init_module(void)
+{
+ return tcf_register_action(&act_police_ops);
+}
+
+static void __exit
+police_cleanup_module(void)
+{
+ tcf_unregister_action(&act_police_ops);
+}
+
+module_init(police_init_module);
+module_exit(police_cleanup_module);