1da177e4c3
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
612 lines
13 KiB
C
612 lines
13 KiB
C
/*
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* net/sched/police.c Input police filter.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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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 <asm/uaccess.h>
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#include <asm/system.h>
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#include <linux/bitops.h>
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#include <linux/config.h>
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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/sched.h>
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#include <linux/string.h>
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#include <linux/mm.h>
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#include <linux/socket.h>
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#include <linux/sockios.h>
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#include <linux/in.h>
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#include <linux/errno.h>
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#include <linux/interrupt.h>
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#include <linux/netdevice.h>
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#include <linux/skbuff.h>
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#include <linux/module.h>
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#include <linux/rtnetlink.h>
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#include <linux/init.h>
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#include <net/sock.h>
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#include <net/act_api.h>
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#define L2T(p,L) ((p)->R_tab->data[(L)>>(p)->R_tab->rate.cell_log])
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#define L2T_P(p,L) ((p)->P_tab->data[(L)>>(p)->P_tab->rate.cell_log])
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#define PRIV(a) ((struct tcf_police *) (a)->priv)
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/* use generic hash table */
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#define MY_TAB_SIZE 16
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#define MY_TAB_MASK 15
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static u32 idx_gen;
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static struct tcf_police *tcf_police_ht[MY_TAB_SIZE];
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/* Policer hash table lock */
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static DEFINE_RWLOCK(police_lock);
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/* Each policer is serialized by its individual spinlock */
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static __inline__ unsigned tcf_police_hash(u32 index)
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{
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return index&0xF;
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}
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static __inline__ struct tcf_police * tcf_police_lookup(u32 index)
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{
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struct tcf_police *p;
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read_lock(&police_lock);
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for (p = tcf_police_ht[tcf_police_hash(index)]; p; p = p->next) {
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if (p->index == index)
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break;
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}
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read_unlock(&police_lock);
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return p;
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}
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#ifdef CONFIG_NET_CLS_ACT
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static int tcf_generic_walker(struct sk_buff *skb, struct netlink_callback *cb,
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int type, struct tc_action *a)
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{
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struct tcf_police *p;
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int err = 0, index = -1, i = 0, s_i = 0, n_i = 0;
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struct rtattr *r;
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read_lock(&police_lock);
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s_i = cb->args[0];
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for (i = 0; i < MY_TAB_SIZE; i++) {
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p = tcf_police_ht[tcf_police_hash(i)];
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for (; p; p = p->next) {
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index++;
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if (index < s_i)
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continue;
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a->priv = p;
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a->order = index;
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r = (struct rtattr*) skb->tail;
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RTA_PUT(skb, a->order, 0, NULL);
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if (type == RTM_DELACTION)
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err = tcf_action_dump_1(skb, a, 0, 1);
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else
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err = tcf_action_dump_1(skb, a, 0, 0);
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if (err < 0) {
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index--;
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skb_trim(skb, (u8*)r - skb->data);
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goto done;
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}
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r->rta_len = skb->tail - (u8*)r;
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n_i++;
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}
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}
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done:
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read_unlock(&police_lock);
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if (n_i)
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cb->args[0] += n_i;
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return n_i;
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rtattr_failure:
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skb_trim(skb, (u8*)r - skb->data);
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goto done;
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}
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static inline int
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tcf_hash_search(struct tc_action *a, u32 index)
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{
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struct tcf_police *p = tcf_police_lookup(index);
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if (p != NULL) {
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a->priv = p;
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return 1;
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} else {
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return 0;
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}
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}
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#endif
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static inline u32 tcf_police_new_index(void)
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{
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do {
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if (++idx_gen == 0)
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idx_gen = 1;
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} while (tcf_police_lookup(idx_gen));
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return idx_gen;
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}
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void tcf_police_destroy(struct tcf_police *p)
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{
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unsigned h = tcf_police_hash(p->index);
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struct tcf_police **p1p;
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for (p1p = &tcf_police_ht[h]; *p1p; p1p = &(*p1p)->next) {
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if (*p1p == p) {
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write_lock_bh(&police_lock);
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*p1p = p->next;
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write_unlock_bh(&police_lock);
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#ifdef CONFIG_NET_ESTIMATOR
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gen_kill_estimator(&p->bstats, &p->rate_est);
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#endif
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if (p->R_tab)
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qdisc_put_rtab(p->R_tab);
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if (p->P_tab)
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qdisc_put_rtab(p->P_tab);
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kfree(p);
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return;
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}
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}
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BUG_TRAP(0);
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}
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#ifdef CONFIG_NET_CLS_ACT
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static int tcf_act_police_locate(struct rtattr *rta, struct rtattr *est,
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struct tc_action *a, int ovr, int bind)
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{
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unsigned h;
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int ret = 0, err;
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struct rtattr *tb[TCA_POLICE_MAX];
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struct tc_police *parm;
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struct tcf_police *p;
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struct qdisc_rate_table *R_tab = NULL, *P_tab = NULL;
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if (rta == NULL || rtattr_parse_nested(tb, TCA_POLICE_MAX, rta) < 0)
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return -EINVAL;
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if (tb[TCA_POLICE_TBF-1] == NULL ||
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RTA_PAYLOAD(tb[TCA_POLICE_TBF-1]) != sizeof(*parm))
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return -EINVAL;
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parm = RTA_DATA(tb[TCA_POLICE_TBF-1]);
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if (tb[TCA_POLICE_RESULT-1] != NULL &&
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RTA_PAYLOAD(tb[TCA_POLICE_RESULT-1]) != sizeof(u32))
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return -EINVAL;
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if (tb[TCA_POLICE_RESULT-1] != NULL &&
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RTA_PAYLOAD(tb[TCA_POLICE_RESULT-1]) != sizeof(u32))
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return -EINVAL;
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if (parm->index && (p = tcf_police_lookup(parm->index)) != NULL) {
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a->priv = p;
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if (bind) {
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p->bindcnt += 1;
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p->refcnt += 1;
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}
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if (ovr)
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goto override;
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return ret;
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}
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p = kmalloc(sizeof(*p), GFP_KERNEL);
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if (p == NULL)
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return -ENOMEM;
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memset(p, 0, sizeof(*p));
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ret = ACT_P_CREATED;
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p->refcnt = 1;
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spin_lock_init(&p->lock);
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p->stats_lock = &p->lock;
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if (bind)
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p->bindcnt = 1;
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override:
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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-1]);
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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-1]);
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if (p->P_tab == NULL) {
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qdisc_put_rtab(R_tab);
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goto failure;
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}
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}
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}
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/* No failure allowed after this point */
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spin_lock_bh(&p->lock);
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if (R_tab != NULL) {
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qdisc_put_rtab(p->R_tab);
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p->R_tab = R_tab;
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}
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if (P_tab != NULL) {
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qdisc_put_rtab(p->P_tab);
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p->P_tab = P_tab;
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}
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if (tb[TCA_POLICE_RESULT-1])
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p->result = *(u32*)RTA_DATA(tb[TCA_POLICE_RESULT-1]);
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p->toks = p->burst = parm->burst;
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p->mtu = parm->mtu;
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if (p->mtu == 0) {
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p->mtu = ~0;
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if (p->R_tab)
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p->mtu = 255<<p->R_tab->rate.cell_log;
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}
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if (p->P_tab)
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p->ptoks = L2T_P(p, p->mtu);
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p->action = parm->action;
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#ifdef CONFIG_NET_ESTIMATOR
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if (tb[TCA_POLICE_AVRATE-1])
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p->ewma_rate = *(u32*)RTA_DATA(tb[TCA_POLICE_AVRATE-1]);
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if (est)
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gen_replace_estimator(&p->bstats, &p->rate_est, p->stats_lock, est);
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#endif
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spin_unlock_bh(&p->lock);
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if (ret != ACT_P_CREATED)
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return ret;
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PSCHED_GET_TIME(p->t_c);
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p->index = parm->index ? : tcf_police_new_index();
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h = tcf_police_hash(p->index);
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write_lock_bh(&police_lock);
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p->next = tcf_police_ht[h];
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tcf_police_ht[h] = p;
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write_unlock_bh(&police_lock);
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a->priv = p;
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return ret;
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failure:
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if (ret == ACT_P_CREATED)
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kfree(p);
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return err;
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}
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static int tcf_act_police_cleanup(struct tc_action *a, int bind)
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{
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struct tcf_police *p = PRIV(a);
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if (p != NULL)
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return tcf_police_release(p, bind);
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return 0;
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}
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static int tcf_act_police(struct sk_buff **pskb, struct tc_action *a)
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{
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psched_time_t now;
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struct sk_buff *skb = *pskb;
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struct tcf_police *p = PRIV(a);
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long toks;
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long ptoks = 0;
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spin_lock(&p->lock);
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p->bstats.bytes += skb->len;
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p->bstats.packets++;
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#ifdef CONFIG_NET_ESTIMATOR
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if (p->ewma_rate && p->rate_est.bps >= p->ewma_rate) {
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p->qstats.overlimits++;
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spin_unlock(&p->lock);
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return p->action;
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}
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#endif
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if (skb->len <= p->mtu) {
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if (p->R_tab == NULL) {
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spin_unlock(&p->lock);
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return p->result;
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}
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PSCHED_GET_TIME(now);
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toks = PSCHED_TDIFF_SAFE(now, p->t_c, p->burst);
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if (p->P_tab) {
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ptoks = toks + p->ptoks;
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if (ptoks > (long)L2T_P(p, p->mtu))
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ptoks = (long)L2T_P(p, p->mtu);
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ptoks -= L2T_P(p, skb->len);
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}
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toks += p->toks;
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if (toks > (long)p->burst)
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toks = p->burst;
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toks -= L2T(p, skb->len);
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if ((toks|ptoks) >= 0) {
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p->t_c = now;
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p->toks = toks;
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p->ptoks = ptoks;
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spin_unlock(&p->lock);
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return p->result;
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}
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}
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p->qstats.overlimits++;
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spin_unlock(&p->lock);
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return p->action;
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}
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static int
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tcf_act_police_dump(struct sk_buff *skb, struct tc_action *a, int bind, int ref)
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{
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unsigned char *b = skb->tail;
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struct tc_police opt;
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struct tcf_police *p = PRIV(a);
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opt.index = p->index;
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opt.action = p->action;
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opt.mtu = p->mtu;
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opt.burst = p->burst;
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opt.refcnt = p->refcnt - ref;
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opt.bindcnt = p->bindcnt - bind;
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if (p->R_tab)
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opt.rate = p->R_tab->rate;
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else
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memset(&opt.rate, 0, sizeof(opt.rate));
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if (p->P_tab)
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opt.peakrate = p->P_tab->rate;
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else
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memset(&opt.peakrate, 0, sizeof(opt.peakrate));
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RTA_PUT(skb, TCA_POLICE_TBF, sizeof(opt), &opt);
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if (p->result)
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RTA_PUT(skb, TCA_POLICE_RESULT, sizeof(int), &p->result);
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#ifdef CONFIG_NET_ESTIMATOR
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if (p->ewma_rate)
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RTA_PUT(skb, TCA_POLICE_AVRATE, 4, &p->ewma_rate);
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#endif
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return skb->len;
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rtattr_failure:
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skb_trim(skb, b - skb->data);
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return -1;
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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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.type = TCA_ID_POLICE,
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.capab = TCA_CAP_NONE,
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.owner = THIS_MODULE,
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.act = tcf_act_police,
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.dump = tcf_act_police_dump,
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.cleanup = tcf_act_police_cleanup,
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.lookup = tcf_hash_search,
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.init = tcf_act_police_locate,
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.walk = tcf_generic_walker
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};
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static int __init
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police_init_module(void)
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{
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return tcf_register_action(&act_police_ops);
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}
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static void __exit
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police_cleanup_module(void)
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{
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tcf_unregister_action(&act_police_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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#endif
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struct tcf_police * tcf_police_locate(struct rtattr *rta, struct rtattr *est)
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{
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unsigned h;
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struct tcf_police *p;
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struct rtattr *tb[TCA_POLICE_MAX];
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struct tc_police *parm;
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if (rtattr_parse_nested(tb, TCA_POLICE_MAX, rta) < 0)
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return NULL;
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if (tb[TCA_POLICE_TBF-1] == NULL ||
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RTA_PAYLOAD(tb[TCA_POLICE_TBF-1]) != sizeof(*parm))
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return NULL;
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parm = RTA_DATA(tb[TCA_POLICE_TBF-1]);
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if (parm->index && (p = tcf_police_lookup(parm->index)) != NULL) {
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p->refcnt++;
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return p;
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}
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p = kmalloc(sizeof(*p), GFP_KERNEL);
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if (p == NULL)
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return NULL;
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memset(p, 0, sizeof(*p));
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p->refcnt = 1;
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spin_lock_init(&p->lock);
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p->stats_lock = &p->lock;
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if (parm->rate.rate) {
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p->R_tab = qdisc_get_rtab(&parm->rate, tb[TCA_POLICE_RATE-1]);
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if (p->R_tab == NULL)
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goto failure;
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if (parm->peakrate.rate) {
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p->P_tab = qdisc_get_rtab(&parm->peakrate,
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tb[TCA_POLICE_PEAKRATE-1]);
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if (p->P_tab == NULL)
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goto failure;
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}
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}
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if (tb[TCA_POLICE_RESULT-1]) {
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if (RTA_PAYLOAD(tb[TCA_POLICE_RESULT-1]) != sizeof(u32))
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goto failure;
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p->result = *(u32*)RTA_DATA(tb[TCA_POLICE_RESULT-1]);
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}
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#ifdef CONFIG_NET_ESTIMATOR
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if (tb[TCA_POLICE_AVRATE-1]) {
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if (RTA_PAYLOAD(tb[TCA_POLICE_AVRATE-1]) != sizeof(u32))
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goto failure;
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p->ewma_rate = *(u32*)RTA_DATA(tb[TCA_POLICE_AVRATE-1]);
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}
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#endif
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p->toks = p->burst = parm->burst;
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p->mtu = parm->mtu;
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if (p->mtu == 0) {
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p->mtu = ~0;
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if (p->R_tab)
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p->mtu = 255<<p->R_tab->rate.cell_log;
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}
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if (p->P_tab)
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p->ptoks = L2T_P(p, p->mtu);
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PSCHED_GET_TIME(p->t_c);
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p->index = parm->index ? : tcf_police_new_index();
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p->action = parm->action;
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#ifdef CONFIG_NET_ESTIMATOR
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if (est)
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gen_new_estimator(&p->bstats, &p->rate_est, p->stats_lock, est);
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#endif
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h = tcf_police_hash(p->index);
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write_lock_bh(&police_lock);
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p->next = tcf_police_ht[h];
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tcf_police_ht[h] = p;
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write_unlock_bh(&police_lock);
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return p;
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failure:
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if (p->R_tab)
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qdisc_put_rtab(p->R_tab);
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kfree(p);
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return NULL;
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}
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int tcf_police(struct sk_buff *skb, struct tcf_police *p)
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{
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psched_time_t now;
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long toks;
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long ptoks = 0;
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|
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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);
|