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/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License, Version 1.0 only
* (the "License"). You may not use this file except in compliance
* with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright 2005 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
#include <sys/types.h>
#include <sys/kmem.h>
#include <sys/random.h>
#include <netinet/in.h>
#include <netinet/in_systm.h>
#include <netinet/ip6.h>
#include <inet/common.h>
#include <inet/ip.h>
#include <inet/ip6.h>
#include <ipp/meters/meter_impl.h>
/*
* Module : Time Sliding Window meter - tswtclmtr
* Description
* This module implements the metering part of RFC 2859. It accepts the
* committed rate, peak rate and the window for a flow and determines
* if the flow is within the committed/peak rate and assigns the appropriate
* next action.
* The meter provides an estimate of the running average bandwidth for the
* flow over the specified window. It uses probability to benefit TCP flows
* as it reduces the likelihood of dropping multiple packets within a TCP
* window without adversely effecting UDP flows.
*/
int tswtcl_debug = 0;
/*
* Given a packet and the tswtcl_data it belongs to, this routine meters the
* ToS or DSCP for IPv4 and IPv6 resp. with the values configured for
* the tswtcl_data.
*/
/* ARGSUSED */
int
tswtcl_process(mblk_t **mpp, tswtcl_data_t *tswtcl_data,
ipp_action_id_t *next_action)
{
ipha_t *ipha;
hrtime_t now;
ip6_t *ip6_hdr;
uint32_t pkt_len;
mblk_t *mp = *mpp;
hrtime_t deltaT;
uint64_t bitsinwin;
uint32_t min = 0, additive, rnd;
tswtcl_cfg_t *cfg_parms = tswtcl_data->cfg_parms;
if (mp == NULL) {
tswtcl0dbg(("tswtcl_process: null mp!\n"));
atomic_inc_64(&tswtcl_data->epackets);
return (EINVAL);
}
if (mp->b_datap->db_type != M_DATA) {
if ((mp->b_cont != NULL) &&
(mp->b_cont->b_datap->db_type == M_DATA)) {
mp = mp->b_cont;
} else {
tswtcl0dbg(("tswtcl_process: no data\n"));
atomic_inc_64(&tswtcl_data->epackets);
return (EINVAL);
}
}
/* Figure out the ToS/Traffic Class and length from the message */
if ((mp->b_wptr - mp->b_rptr) < IP_SIMPLE_HDR_LENGTH) {
if (!pullupmsg(mp, IP_SIMPLE_HDR_LENGTH)) {
tswtcl0dbg(("tswtcl_process: pullup error\n"));
atomic_inc_64(&tswtcl_data->epackets);
return (EINVAL);
}
}
ipha = (ipha_t *)mp->b_rptr;
if (IPH_HDR_VERSION(ipha) == IPV4_VERSION) {
pkt_len = ntohs(ipha->ipha_length);
} else {
ip6_hdr = (ip6_t *)mp->b_rptr;
pkt_len = ntohs(ip6_hdr->ip6_plen) +
ip_hdr_length_v6(mp, ip6_hdr);
}
/* Convert into bits */
pkt_len <<= 3;
/* Get current time */
now = gethrtime();
/* Update the avg_rate and win_front tswtcl_data */
mutex_enter(&tswtcl_data->tswtcl_lock);
/* avg_rate = bits/sec and window in msec */
bitsinwin = ((uint64_t)tswtcl_data->avg_rate * cfg_parms->window /
1000) + pkt_len;
deltaT = now - tswtcl_data->win_front + cfg_parms->nsecwindow;
tswtcl_data->avg_rate = (uint64_t)bitsinwin * METER_SEC_TO_NSEC /
deltaT;
tswtcl_data->win_front = now;
if (tswtcl_data->avg_rate <= cfg_parms->committed_rate) {
*next_action = cfg_parms->green_action;
} else if (tswtcl_data->avg_rate <= cfg_parms->peak_rate) {
/*
* Compute the probability:
*
* p0 = (avg_rate - committed_rate) / avg_rate
*
* Yellow with probability p0
* Green with probability (1 - p0)
*
*/
uint32_t aminusc;
/* Get a random no. betweeen 0 and avg_rate */
(void) random_get_pseudo_bytes((uint8_t *)&additive,
sizeof (additive));
rnd = min + (additive % (tswtcl_data->avg_rate - min + 1));
aminusc = tswtcl_data->avg_rate - cfg_parms->committed_rate;
if (aminusc >= rnd) {
*next_action = cfg_parms->yellow_action;
} else {
*next_action = cfg_parms->green_action;
}
} else {
/*
* Compute the probability:
*
* p1 = (avg_rate - peak_rate) / avg_rate
* p2 = (peak_rate - committed_rate) / avg_rate
*
* Red with probability p1
* Yellow with probability p2
* Green with probability (1 - (p1 + p2))
*
*/
uint32_t aminusp;
/* Get a random no. betweeen 0 and avg_rate */
(void) random_get_pseudo_bytes((uint8_t *)&additive,
sizeof (additive));
rnd = min + (additive % (tswtcl_data->avg_rate - min + 1));
aminusp = tswtcl_data->avg_rate - cfg_parms->peak_rate;
if (aminusp >= rnd) {
*next_action = cfg_parms->red_action;
} else if ((cfg_parms->pminusc + aminusp) >= rnd) {
*next_action = cfg_parms->yellow_action;
} else {
*next_action = cfg_parms->green_action;
}
}
mutex_exit(&tswtcl_data->tswtcl_lock);
/* Update Stats */
if (*next_action == cfg_parms->green_action) {
atomic_inc_64(&tswtcl_data->green_packets);
atomic_add_64(&tswtcl_data->green_bits, pkt_len);
} else if (*next_action == cfg_parms->yellow_action) {
atomic_inc_64(&tswtcl_data->yellow_packets);
atomic_add_64(&tswtcl_data->yellow_bits, pkt_len);
} else {
ASSERT(*next_action == cfg_parms->red_action);
atomic_inc_64(&tswtcl_data->red_packets);
atomic_add_64(&tswtcl_data->red_bits, pkt_len);
}
return (0);
}
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