1 files changed, 612 insertions, 0 deletions

diff --git a/net/sched/police.c b/net/sched/police.c
new file mode 100644
index 000000000000..c03545faf523
--- /dev/null
+++ b/net/sched/police.c
@@ -0,0 +1,612 @@
+/*
+ * 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 <asm/uaccess.h>
+#include <asm/system.h>
+#include <linux/bitops.h>
+#include <linux/config.h>
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/sched.h>
+#include <linux/string.h>
+#include <linux/mm.h>
+#include <linux/socket.h>
+#include <linux/sockios.h>
+#include <linux/in.h>
+#include <linux/errno.h>
+#include <linux/interrupt.h>
+#include <linux/netdevice.h>
+#include <linux/skbuff.h>
+#include <linux/module.h>
+#include <linux/rtnetlink.h>
+#include <linux/init.h>
+#include <net/sock.h>
+#include <net/act_api.h>
+
+#define L2T(p,L)   ((p)->R_tab->data[(L)>>(p)->R_tab->rate.cell_log])
+#define L2T_P(p,L) ((p)->P_tab->data[(L)>>(p)->P_tab->rate.cell_log])
+#define PRIV(a) ((struct tcf_police *) (a)->priv)
+
+/* use generic hash table */
+#define MY_TAB_SIZE     16
+#define MY_TAB_MASK     15
+static u32 idx_gen;
+static struct tcf_police *tcf_police_ht[MY_TAB_SIZE];
+/* Policer hash table lock */
+static DEFINE_RWLOCK(police_lock);
+
+/* Each policer is serialized by its individual spinlock */
+
+static __inline__ unsigned tcf_police_hash(u32 index)
+{
+        return index&0xF;
+}
+
+static __inline__ struct tcf_police * tcf_police_lookup(u32 index)
+{
+        struct tcf_police *p;
+
+        read_lock(&police_lock);
+        for (p = tcf_police_ht[tcf_police_hash(index)]; p; p = p->next) {
+                if (p->index == index)
+                        break;
+        }
+        read_unlock(&police_lock);
+        return p;
+}
+
+#ifdef CONFIG_NET_CLS_ACT
+static int tcf_generic_walker(struct sk_buff *skb, struct netlink_callback *cb,
+                              int type, struct tc_action *a)
+{
+        struct tcf_police *p;
+        int err = 0, index = -1, i = 0, s_i = 0, n_i = 0;
+        struct rtattr *r;
+
+        read_lock(&police_lock);
+
+        s_i = cb->args[0];
+
+        for (i = 0; i < MY_TAB_SIZE; i++) {
+                p = tcf_police_ht[tcf_police_hash(i)];
+
+                for (; p; p = p->next) {
+                        index++;
+                        if (index < s_i)
+                                continue;
+                        a->priv = p;
+                        a->order = index;
+                        r = (struct rtattr*) skb->tail;
+                        RTA_PUT(skb, a->order, 0, NULL);
+                        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--;
+                                skb_trim(skb, (u8*)r - skb->data);
+                                goto done;
+                        }
+                        r->rta_len = skb->tail - (u8*)r;
+                        n_i++;
+                }
+        }
+done:
+        read_unlock(&police_lock);
+        if (n_i)
+                cb->args[0] += n_i;
+        return n_i;
+
+rtattr_failure:
+        skb_trim(skb, (u8*)r - skb->data);
+        goto done;
+}
+
+static inline int
+tcf_hash_search(struct tc_action *a, u32 index)
+{
+        struct tcf_police *p = tcf_police_lookup(index);
+
+        if (p != NULL) {
+                a->priv = p;
+                return 1;
+        } else {
+                return 0;
+        }
+}
+#endif
+
+static inline u32 tcf_police_new_index(void)
+{
+        do {
+                if (++idx_gen == 0)
+                        idx_gen = 1;
+        } while (tcf_police_lookup(idx_gen));
+
+        return idx_gen;
+}
+
+void tcf_police_destroy(struct tcf_police *p)
+{
+        unsigned h = tcf_police_hash(p->index);
+        struct tcf_police **p1p;
+        
+        for (p1p = &tcf_police_ht[h]; *p1p; p1p = &(*p1p)->next) {
+                if (*p1p == p) {
+                        write_lock_bh(&police_lock);
+                        *p1p = p->next;
+                        write_unlock_bh(&police_lock);
+#ifdef CONFIG_NET_ESTIMATOR
+                        gen_kill_estimator(&p->bstats, &p->rate_est);
+#endif
+                        if (p->R_tab)
+                                qdisc_put_rtab(p->R_tab);
+                        if (p->P_tab)
+                                qdisc_put_rtab(p->P_tab);
+                        kfree(p);
+                        return;
+                }
+        }
+        BUG_TRAP(0);
+}
+
+#ifdef CONFIG_NET_CLS_ACT
+static int tcf_act_police_locate(struct rtattr *rta, struct rtattr *est,
+                                 struct tc_action *a, int ovr, int bind)
+{
+        unsigned h;
+        int ret = 0, err;
+        struct rtattr *tb[TCA_POLICE_MAX];
+        struct tc_police *parm;
+        struct tcf_police *p;
+        struct qdisc_rate_table *R_tab = NULL, *P_tab = NULL;
+
+        if (rta == NULL || rtattr_parse_nested(tb, TCA_POLICE_MAX, rta) < 0)
+                return -EINVAL;
+
+        if (tb[TCA_POLICE_TBF-1] == NULL ||
+            RTA_PAYLOAD(tb[TCA_POLICE_TBF-1]) != sizeof(*parm))
+                return -EINVAL;
+        parm = RTA_DATA(tb[TCA_POLICE_TBF-1]);
+
+        if (tb[TCA_POLICE_RESULT-1] != NULL &&
+            RTA_PAYLOAD(tb[TCA_POLICE_RESULT-1]) != sizeof(u32))
+                return -EINVAL;
+        if (tb[TCA_POLICE_RESULT-1] != NULL &&
+            RTA_PAYLOAD(tb[TCA_POLICE_RESULT-1]) != sizeof(u32))
+                return -EINVAL;
+
+        if (parm->index && (p = tcf_police_lookup(parm->index)) != NULL) {
+                a->priv = p;
+                if (bind) {
+                        p->bindcnt += 1;
+                        p->refcnt += 1;
+                }
+                if (ovr)
+                        goto override;
+                return ret;
+        }
+
+        p = kmalloc(sizeof(*p), GFP_KERNEL);
+        if (p == NULL)
+                return -ENOMEM;
+        memset(p, 0, sizeof(*p));
+
+        ret = ACT_P_CREATED;
+        p->refcnt = 1;
+        spin_lock_init(&p->lock);
+        p->stats_lock = &p->lock;
+        if (bind)
+                p->bindcnt = 1;
+override:
+        if (parm->rate.rate) {
+                err = -ENOMEM;
+                R_tab = qdisc_get_rtab(&parm->rate, tb[TCA_POLICE_RATE-1]);
+                if (R_tab == NULL)
+                        goto failure;
+                if (parm->peakrate.rate) {
+                        P_tab = qdisc_get_rtab(&parm->peakrate,
+                                               tb[TCA_POLICE_PEAKRATE-1]);
+                        if (p->P_tab == NULL) {
+                                qdisc_put_rtab(R_tab);
+                                goto failure;
+                        }
+                }
+        }
+        /* No failure allowed after this point */
+        spin_lock_bh(&p->lock);
+        if (R_tab != NULL) {
+                qdisc_put_rtab(p->R_tab);
+                p->R_tab = R_tab;
+        }
+        if (P_tab != NULL) {
+                qdisc_put_rtab(p->P_tab);
+                p->P_tab = P_tab;
+        }
+
+        if (tb[TCA_POLICE_RESULT-1])
+                p->result = *(u32*)RTA_DATA(tb[TCA_POLICE_RESULT-1]);
+        p->toks = p->burst = parm->burst;
+        p->mtu = parm->mtu;
+        if (p->mtu == 0) {
+                p->mtu = ~0;
+                if (p->R_tab)
+                        p->mtu = 255<<p->R_tab->rate.cell_log;
+        }
+        if (p->P_tab)
+                p->ptoks = L2T_P(p, p->mtu);
+        p->action = parm->action;
+
+#ifdef CONFIG_NET_ESTIMATOR
+        if (tb[TCA_POLICE_AVRATE-1])
+                p->ewma_rate = *(u32*)RTA_DATA(tb[TCA_POLICE_AVRATE-1]);
+        if (est)
+                gen_replace_estimator(&p->bstats, &p->rate_est, p->stats_lock, est);
+#endif
+
+        spin_unlock_bh(&p->lock);
+        if (ret != ACT_P_CREATED)
+                return ret;
+
+        PSCHED_GET_TIME(p->t_c);
+        p->index = parm->index ? : tcf_police_new_index();
+        h = tcf_police_hash(p->index);
+        write_lock_bh(&police_lock);
+        p->next = tcf_police_ht[h];
+        tcf_police_ht[h] = p;
+        write_unlock_bh(&police_lock);
+
+        a->priv = p;
+        return ret;
+
+failure:
+        if (ret == ACT_P_CREATED)
+                kfree(p);
+        return err;
+}
+
+static int tcf_act_police_cleanup(struct tc_action *a, int bind)
+{
+        struct tcf_police *p = PRIV(a);
+
+        if (p != NULL)
+                return tcf_police_release(p, bind);
+        return 0;
+}
+
+static int tcf_act_police(struct sk_buff **pskb, struct tc_action *a)
+{
+        psched_time_t now;
+        struct sk_buff *skb = *pskb;
+        struct tcf_police *p = PRIV(a);
+        long toks;
+        long ptoks = 0;
+
+        spin_lock(&p->lock);
+
+        p->bstats.bytes += skb->len;
+        p->bstats.packets++;
+
+#ifdef CONFIG_NET_ESTIMATOR
+        if (p->ewma_rate && p->rate_est.bps >= p->ewma_rate) {
+                p->qstats.overlimits++;
+                spin_unlock(&p->lock);
+                return p->action;
+        }
+#endif
+
+        if (skb->len <= p->mtu) {
+                if (p->R_tab == NULL) {
+                        spin_unlock(&p->lock);
+                        return p->result;
+                }
+
+                PSCHED_GET_TIME(now);
+
+                toks = PSCHED_TDIFF_SAFE(now, p->t_c, p->burst);
+
+                if (p->P_tab) {
+                        ptoks = toks + p->ptoks;
+                        if (ptoks > (long)L2T_P(p, p->mtu))
+                                ptoks = (long)L2T_P(p, p->mtu);
+                        ptoks -= L2T_P(p, skb->len);
+                }
+                toks += p->toks;
+                if (toks > (long)p->burst)
+                        toks = p->burst;
+                toks -= L2T(p, skb->len);
+
+                if ((toks|ptoks) >= 0) {
+                        p->t_c = now;
+                        p->toks = toks;
+                        p->ptoks = ptoks;
+                        spin_unlock(&p->lock);
+                        return p->result;
+                }
+        }
+
+        p->qstats.overlimits++;
+        spin_unlock(&p->lock);
+        return p->action;
+}
+
+static int
+tcf_act_police_dump(struct sk_buff *skb, struct tc_action *a, int bind, int ref)
+{
+        unsigned char    *b = skb->tail;
+        struct tc_police opt;
+        struct tcf_police *p = PRIV(a);
+
+        opt.index = p->index;
+        opt.action = p->action;
+        opt.mtu = p->mtu;
+        opt.burst = p->burst;
+        opt.refcnt = p->refcnt - ref;
+        opt.bindcnt = p->bindcnt - bind;
+        if (p->R_tab)
+                opt.rate = p->R_tab->rate;
+        else
+                memset(&opt.rate, 0, sizeof(opt.rate));
+        if (p->P_tab)
+                opt.peakrate = p->P_tab->rate;
+        else
+                memset(&opt.peakrate, 0, sizeof(opt.peakrate));
+        RTA_PUT(skb, TCA_POLICE_TBF, sizeof(opt), &opt);
+        if (p->result)
+                RTA_PUT(skb, TCA_POLICE_RESULT, sizeof(int), &p->result);
+#ifdef CONFIG_NET_ESTIMATOR
+        if (p->ewma_rate)
+                RTA_PUT(skb, TCA_POLICE_AVRATE, 4, &p->ewma_rate);
+#endif
+        return skb->len;
+
+rtattr_failure:
+        skb_trim(skb, b - skb->data);
+        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,
+        .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_generic_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);
+
+#endif
+
+struct tcf_police * tcf_police_locate(struct rtattr *rta, struct rtattr *est)
+{
+        unsigned h;
+        struct tcf_police *p;
+        struct rtattr *tb[TCA_POLICE_MAX];
+        struct tc_police *parm;
+
+        if (rtattr_parse_nested(tb, TCA_POLICE_MAX, rta) < 0)
+                return NULL;
+
+        if (tb[TCA_POLICE_TBF-1] == NULL ||
+            RTA_PAYLOAD(tb[TCA_POLICE_TBF-1]) != sizeof(*parm))
+                return NULL;
+
+        parm = RTA_DATA(tb[TCA_POLICE_TBF-1]);
+
+        if (parm->index && (p = tcf_police_lookup(parm->index)) != NULL) {
+                p->refcnt++;
+                return p;
+        }
+
+        p = kmalloc(sizeof(*p), GFP_KERNEL);
+        if (p == NULL)
+                return NULL;
+
+        memset(p, 0, sizeof(*p));
+        p->refcnt = 1;
+        spin_lock_init(&p->lock);
+        p->stats_lock = &p->lock;
+        if (parm->rate.rate) {
+                p->R_tab = qdisc_get_rtab(&parm->rate, tb[TCA_POLICE_RATE-1]);
+                if (p->R_tab == NULL)
+                        goto failure;
+                if (parm->peakrate.rate) {
+                        p->P_tab = qdisc_get_rtab(&parm->peakrate,
+                                                  tb[TCA_POLICE_PEAKRATE-1]);
+                        if (p->P_tab == NULL)
+                                goto failure;
+                }
+        }
+        if (tb[TCA_POLICE_RESULT-1]) {
+                if (RTA_PAYLOAD(tb[TCA_POLICE_RESULT-1]) != sizeof(u32))
+                        goto failure;
+                p->result = *(u32*)RTA_DATA(tb[TCA_POLICE_RESULT-1]);
+        }
+#ifdef CONFIG_NET_ESTIMATOR
+        if (tb[TCA_POLICE_AVRATE-1]) {
+                if (RTA_PAYLOAD(tb[TCA_POLICE_AVRATE-1]) != sizeof(u32))
+                        goto failure;
+                p->ewma_rate = *(u32*)RTA_DATA(tb[TCA_POLICE_AVRATE-1]);
+        }
+#endif
+        p->toks = p->burst = parm->burst;
+        p->mtu = parm->mtu;
+        if (p->mtu == 0) {
+                p->mtu = ~0;
+                if (p->R_tab)
+                        p->mtu = 255<<p->R_tab->rate.cell_log;
+        }
+        if (p->P_tab)
+                p->ptoks = L2T_P(p, p->mtu);
+        PSCHED_GET_TIME(p->t_c);
+        p->index = parm->index ? : tcf_police_new_index();
+        p->action = parm->action;
+#ifdef CONFIG_NET_ESTIMATOR
+        if (est)
+                gen_new_estimator(&p->bstats, &p->rate_est, p->stats_lock, est);
+#endif
+        h = tcf_police_hash(p->index);
+        write_lock_bh(&police_lock);
+        p->next = tcf_police_ht[h];
+        tcf_police_ht[h] = p;
+        write_unlock_bh(&police_lock);
+        return p;
+
+failure:
+        if (p->R_tab)
+                qdisc_put_rtab(p->R_tab);
+        kfree(p);
+        return NULL;
+}
+
+int tcf_police(struct sk_buff *skb, struct tcf_police *p)
+{
+        psched_time_t now;
+        long toks;
+        long ptoks = 0;
+
+        spin_lock(&p->lock);
+
+        p->bstats.bytes += skb->len;
+        p->bstats.packets++;
+
+#ifdef CONFIG_NET_ESTIMATOR
+        if (p->ewma_rate && p->rate_est.bps >= p->ewma_rate) {
+                p->qstats.overlimits++;
+                spin_unlock(&p->lock);
+                return p->action;
+        }
+#endif
+
+        if (skb->len <= p->mtu) {
+                if (p->R_tab == NULL) {
+                        spin_unlock(&p->lock);
+                        return p->result;
+                }
+
+                PSCHED_GET_TIME(now);
+
+                toks = PSCHED_TDIFF_SAFE(now, p->t_c, p->burst);
+
+                if (p->P_tab) {
+                        ptoks = toks + p->ptoks;
+                        if (ptoks > (long)L2T_P(p, p->mtu))
+                                ptoks = (long)L2T_P(p, p->mtu);
+                        ptoks -= L2T_P(p, skb->len);
+                }
+                toks += p->toks;
+                if (toks > (long)p->burst)
+                        toks = p->burst;
+                toks -= L2T(p, skb->len);
+
+                if ((toks|ptoks) >= 0) {
+                        p->t_c = now;
+                        p->toks = toks;
+                        p->ptoks = ptoks;
+                        spin_unlock(&p->lock);
+                        return p->result;
+                }
+        }
+
+        p->qstats.overlimits++;
+        spin_unlock(&p->lock);
+        return p->action;
+}
+
+int tcf_police_dump(struct sk_buff *skb, struct tcf_police *p)
+{
+        unsigned char    *b = skb->tail;
+        struct tc_police opt;
+
+        opt.index = p->index;
+        opt.action = p->action;
+        opt.mtu = p->mtu;
+        opt.burst = p->burst;
+        if (p->R_tab)
+                opt.rate = p->R_tab->rate;
+        else
+                memset(&opt.rate, 0, sizeof(opt.rate));
+        if (p->P_tab)
+                opt.peakrate = p->P_tab->rate;
+        else
+                memset(&opt.peakrate, 0, sizeof(opt.peakrate));
+        RTA_PUT(skb, TCA_POLICE_TBF, sizeof(opt), &opt);
+        if (p->result)
+                RTA_PUT(skb, TCA_POLICE_RESULT, sizeof(int), &p->result);
+#ifdef CONFIG_NET_ESTIMATOR
+        if (p->ewma_rate)
+                RTA_PUT(skb, TCA_POLICE_AVRATE, 4, &p->ewma_rate);
+#endif
+        return skb->len;
+
+rtattr_failure:
+        skb_trim(skb, b - skb->data);
+        return -1;
+}
+
+int tcf_police_dump_stats(struct sk_buff *skb, struct tcf_police *p)
+{
+        struct gnet_dump d;
+        
+        if (gnet_stats_start_copy_compat(skb, TCA_STATS2, TCA_STATS,
+                        TCA_XSTATS, p->stats_lock, &d) < 0)
+                goto errout;
+        
+        if (gnet_stats_copy_basic(&d, &p->bstats) < 0 ||
+#ifdef CONFIG_NET_ESTIMATOR
+            gnet_stats_copy_rate_est(&d, &p->rate_est) < 0 ||
+#endif
+            gnet_stats_copy_queue(&d, &p->qstats) < 0)
+                goto errout;
+
+        if (gnet_stats_finish_copy(&d) < 0)
+                goto errout;
+
+        return 0;
+
+errout:
+        return -1;
+}
+
+
+EXPORT_SYMBOL(tcf_police);
+EXPORT_SYMBOL(tcf_police_destroy);
+EXPORT_SYMBOL(tcf_police_dump);
+EXPORT_SYMBOL(tcf_police_dump_stats);
+EXPORT_SYMBOL(tcf_police_hash);
+EXPORT_SYMBOL(tcf_police_ht);
+EXPORT_SYMBOL(tcf_police_locate);
+EXPORT_SYMBOL(tcf_police_lookup);
+EXPORT_SYMBOL(tcf_police_new_index);