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pfctl_altq.c
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/* $OpenBSD: pfctl_altq.c,v 1.93 2007/10/15 02:16:35 deraadt Exp $ */
/*
* Copyright (c) 2002
* Sony Computer Science Laboratories Inc.
* Copyright (c) 2002, 2003 Henning Brauer <[email protected]>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/types.h>
#include <sys/ioctl.h>
#include <sys/socket.h>
#include <net/if.h>
#include <netinet/in.h>
#include <net/pfvar.h>
#include <err.h>
#include <errno.h>
#include <limits.h>
#include <math.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <altq/altq.h>
#include <altq/altq_cbq.h>
#include <altq/altq_priq.h>
#include <altq/altq_hfsc.h>
#include "pfctl_parser.h"
#include "pfctl.h"
#define is_sc_null(sc) (((sc) == NULL) || ((sc)->m1 == 0 && (sc)->m2 == 0))
TAILQ_HEAD(altqs, pf_altq) altqs = TAILQ_HEAD_INITIALIZER(altqs);
LIST_HEAD(gen_sc, segment) rtsc, lssc;
struct pf_altq *qname_to_pfaltq(const char *, const char *);
u_int32_t qname_to_qid(const char *);
static int eval_pfqueue_cbq(struct pfctl *, struct pf_altq *);
static int cbq_compute_idletime(struct pfctl *, struct pf_altq *);
static int check_commit_cbq(int, int, struct pf_altq *);
static int print_cbq_opts(const struct pf_altq *);
static int eval_pfqueue_priq(struct pfctl *, struct pf_altq *);
static int check_commit_priq(int, int, struct pf_altq *);
static int print_priq_opts(const struct pf_altq *);
static int eval_pfqueue_hfsc(struct pfctl *, struct pf_altq *);
static int check_commit_hfsc(int, int, struct pf_altq *);
static int print_hfsc_opts(const struct pf_altq *,
const struct node_queue_opt *);
static void gsc_add_sc(struct gen_sc *, struct service_curve *);
static int is_gsc_under_sc(struct gen_sc *,
struct service_curve *);
static void gsc_destroy(struct gen_sc *);
static struct segment *gsc_getentry(struct gen_sc *, double);
static int gsc_add_seg(struct gen_sc *, double, double, double,
double);
static double sc_x2y(struct service_curve *, double);
#ifdef __FreeBSD__
u_int32_t getifspeed(int, char *);
#else
u_int32_t getifspeed(char *);
#endif
u_long getifmtu(char *);
int eval_queue_opts(struct pf_altq *, struct node_queue_opt *,
u_int32_t);
u_int32_t eval_bwspec(struct node_queue_bw *, u_int32_t);
void print_hfsc_sc(const char *, u_int, u_int, u_int,
const struct node_hfsc_sc *);
void
pfaltq_store(struct pf_altq *a)
{
struct pf_altq *altq;
if ((altq = malloc(sizeof(*altq))) == NULL)
err(1, "malloc");
memcpy(altq, a, sizeof(struct pf_altq));
TAILQ_INSERT_TAIL(&altqs, altq, entries);
}
struct pf_altq *
pfaltq_lookup(const char *ifname)
{
struct pf_altq *altq;
TAILQ_FOREACH(altq, &altqs, entries) {
if (strncmp(ifname, altq->ifname, IFNAMSIZ) == 0 &&
altq->qname[0] == 0)
return (altq);
}
return (NULL);
}
struct pf_altq *
qname_to_pfaltq(const char *qname, const char *ifname)
{
struct pf_altq *altq;
TAILQ_FOREACH(altq, &altqs, entries) {
if (strncmp(ifname, altq->ifname, IFNAMSIZ) == 0 &&
strncmp(qname, altq->qname, PF_QNAME_SIZE) == 0)
return (altq);
}
return (NULL);
}
u_int32_t
qname_to_qid(const char *qname)
{
struct pf_altq *altq;
/*
* We guarantee that same named queues on different interfaces
* have the same qid, so we do NOT need to limit matching on
* one interface!
*/
TAILQ_FOREACH(altq, &altqs, entries) {
if (strncmp(qname, altq->qname, PF_QNAME_SIZE) == 0)
return (altq->qid);
}
return (0);
}
void
print_altq(const struct pf_altq *a, unsigned int level,
struct node_queue_bw *bw, struct node_queue_opt *qopts)
{
if (a->qname[0] != 0) {
print_queue(a, level, bw, 1, qopts);
return;
}
#ifdef __FreeBSD__
if (a->local_flags & PFALTQ_FLAG_IF_REMOVED)
printf("INACTIVE ");
#endif
printf("altq on %s ", a->ifname);
switch (a->scheduler) {
case ALTQT_CBQ:
if (!print_cbq_opts(a))
printf("cbq ");
break;
case ALTQT_PRIQ:
if (!print_priq_opts(a))
printf("priq ");
break;
case ALTQT_HFSC:
if (!print_hfsc_opts(a, qopts))
printf("hfsc ");
break;
}
if (bw != NULL && bw->bw_percent > 0) {
if (bw->bw_percent < 100)
printf("bandwidth %u%% ", bw->bw_percent);
} else
printf("bandwidth %s ", rate2str((double)a->ifbandwidth));
if (a->qlimit != DEFAULT_QLIMIT)
printf("qlimit %u ", a->qlimit);
printf("tbrsize %u ", a->tbrsize);
}
void
print_queue(const struct pf_altq *a, unsigned int level,
struct node_queue_bw *bw, int print_interface,
struct node_queue_opt *qopts)
{
unsigned int i;
#ifdef __FreeBSD__
if (a->local_flags & PFALTQ_FLAG_IF_REMOVED)
printf("INACTIVE ");
#endif
printf("queue ");
for (i = 0; i < level; ++i)
printf(" ");
printf("%s ", a->qname);
if (print_interface)
printf("on %s ", a->ifname);
if (a->scheduler == ALTQT_CBQ || a->scheduler == ALTQT_HFSC) {
if (bw != NULL && bw->bw_percent > 0) {
if (bw->bw_percent < 100)
printf("bandwidth %u%% ", bw->bw_percent);
} else
printf("bandwidth %s ", rate2str((double)a->bandwidth));
}
if (a->priority != DEFAULT_PRIORITY)
printf("priority %u ", a->priority);
if (a->qlimit != DEFAULT_QLIMIT)
printf("qlimit %u ", a->qlimit);
switch (a->scheduler) {
case ALTQT_CBQ:
print_cbq_opts(a);
break;
case ALTQT_PRIQ:
print_priq_opts(a);
break;
case ALTQT_HFSC:
print_hfsc_opts(a, qopts);
break;
}
}
/*
* eval_pfaltq computes the discipline parameters.
*/
int
eval_pfaltq(struct pfctl *pf, struct pf_altq *pa, struct node_queue_bw *bw,
struct node_queue_opt *opts)
{
u_int rate, size, errors = 0;
if (bw->bw_absolute > 0)
pa->ifbandwidth = bw->bw_absolute;
else
#ifdef __FreeBSD__
if ((rate = getifspeed(pf->dev, pa->ifname)) == 0) {
#else
if ((rate = getifspeed(pa->ifname)) == 0) {
#endif
fprintf(stderr, "interface %s does not know its bandwidth, "
"please specify an absolute bandwidth\n",
pa->ifname);
errors++;
} else if ((pa->ifbandwidth = eval_bwspec(bw, rate)) == 0)
pa->ifbandwidth = rate;
errors += eval_queue_opts(pa, opts, pa->ifbandwidth);
/* if tbrsize is not specified, use heuristics */
if (pa->tbrsize == 0) {
rate = pa->ifbandwidth;
if (rate <= 1 * 1000 * 1000)
size = 1;
else if (rate <= 10 * 1000 * 1000)
size = 4;
else if (rate <= 200 * 1000 * 1000)
size = 8;
else
size = 24;
size = size * getifmtu(pa->ifname);
if (size > 0xffff)
size = 0xffff;
pa->tbrsize = size;
}
return (errors);
}
/*
* check_commit_altq does consistency check for each interface
*/
int
check_commit_altq(int dev, int opts)
{
struct pf_altq *altq;
int error = 0;
/* call the discipline check for each interface. */
TAILQ_FOREACH(altq, &altqs, entries) {
if (altq->qname[0] == 0) {
switch (altq->scheduler) {
case ALTQT_CBQ:
error = check_commit_cbq(dev, opts, altq);
break;
case ALTQT_PRIQ:
error = check_commit_priq(dev, opts, altq);
break;
case ALTQT_HFSC:
error = check_commit_hfsc(dev, opts, altq);
break;
default:
break;
}
}
}
return (error);
}
/*
* eval_pfqueue computes the queue parameters.
*/
int
eval_pfqueue(struct pfctl *pf, struct pf_altq *pa, struct node_queue_bw *bw,
struct node_queue_opt *opts)
{
/* should be merged with expand_queue */
struct pf_altq *if_pa, *parent, *altq;
u_int32_t bwsum;
int error = 0;
/* find the corresponding interface and copy fields used by queues */
if ((if_pa = pfaltq_lookup(pa->ifname)) == NULL) {
fprintf(stderr, "altq not defined on %s\n", pa->ifname);
return (1);
}
pa->scheduler = if_pa->scheduler;
pa->ifbandwidth = if_pa->ifbandwidth;
if (qname_to_pfaltq(pa->qname, pa->ifname) != NULL) {
fprintf(stderr, "queue %s already exists on interface %s\n",
pa->qname, pa->ifname);
return (1);
}
pa->qid = qname_to_qid(pa->qname);
parent = NULL;
if (pa->parent[0] != 0) {
parent = qname_to_pfaltq(pa->parent, pa->ifname);
if (parent == NULL) {
fprintf(stderr, "parent %s not found for %s\n",
pa->parent, pa->qname);
return (1);
}
pa->parent_qid = parent->qid;
}
if (pa->qlimit == 0)
pa->qlimit = DEFAULT_QLIMIT;
if (pa->scheduler == ALTQT_CBQ || pa->scheduler == ALTQT_HFSC) {
pa->bandwidth = eval_bwspec(bw,
parent == NULL ? 0 : parent->bandwidth);
if (pa->bandwidth > pa->ifbandwidth) {
fprintf(stderr, "bandwidth for %s higher than "
"interface\n", pa->qname);
return (1);
}
/* check the sum of the child bandwidth is under parent's */
if (parent != NULL) {
if (pa->bandwidth > parent->bandwidth) {
warnx("bandwidth for %s higher than parent",
pa->qname);
return (1);
}
bwsum = 0;
TAILQ_FOREACH(altq, &altqs, entries) {
if (strncmp(altq->ifname, pa->ifname,
IFNAMSIZ) == 0 &&
altq->qname[0] != 0 &&
strncmp(altq->parent, pa->parent,
PF_QNAME_SIZE) == 0)
bwsum += altq->bandwidth;
}
bwsum += pa->bandwidth;
if (bwsum > parent->bandwidth) {
warnx("the sum of the child bandwidth higher"
" than parent \"%s\"", parent->qname);
}
}
}
if (eval_queue_opts(pa, opts, parent == NULL? 0 : parent->bandwidth))
return (1);
switch (pa->scheduler) {
case ALTQT_CBQ:
error = eval_pfqueue_cbq(pf, pa);
break;
case ALTQT_PRIQ:
error = eval_pfqueue_priq(pf, pa);
break;
case ALTQT_HFSC:
error = eval_pfqueue_hfsc(pf, pa);
break;
default:
break;
}
return (error);
}
/*
* CBQ support functions
*/
#define RM_FILTER_GAIN 5 /* log2 of gain, e.g., 5 => 31/32 */
#define RM_NS_PER_SEC (1000000000)
static int
eval_pfqueue_cbq(struct pfctl *pf, struct pf_altq *pa)
{
struct cbq_opts *opts;
u_int ifmtu;
if (pa->priority >= CBQ_MAXPRI) {
warnx("priority out of range: max %d", CBQ_MAXPRI - 1);
return (-1);
}
ifmtu = getifmtu(pa->ifname);
opts = &pa->pq_u.cbq_opts;
if (opts->pktsize == 0) { /* use default */
opts->pktsize = ifmtu;
if (opts->pktsize > MCLBYTES) /* do what TCP does */
opts->pktsize &= ~MCLBYTES;
} else if (opts->pktsize > ifmtu)
opts->pktsize = ifmtu;
if (opts->maxpktsize == 0) /* use default */
opts->maxpktsize = ifmtu;
else if (opts->maxpktsize > ifmtu)
opts->pktsize = ifmtu;
if (opts->pktsize > opts->maxpktsize)
opts->pktsize = opts->maxpktsize;
if (pa->parent[0] == 0)
opts->flags |= (CBQCLF_ROOTCLASS | CBQCLF_WRR);
cbq_compute_idletime(pf, pa);
return (0);
}
/*
* compute ns_per_byte, maxidle, minidle, and offtime
*/
static int
cbq_compute_idletime(struct pfctl *pf, struct pf_altq *pa)
{
struct cbq_opts *opts;
double maxidle_s, maxidle, minidle;
double offtime, nsPerByte, ifnsPerByte, ptime, cptime;
double z, g, f, gton, gtom;
u_int minburst, maxburst;
opts = &pa->pq_u.cbq_opts;
ifnsPerByte = (1.0 / (double)pa->ifbandwidth) * RM_NS_PER_SEC * 8;
minburst = opts->minburst;
maxburst = opts->maxburst;
if (pa->bandwidth == 0)
f = 0.0001; /* small enough? */
else
f = ((double) pa->bandwidth / (double) pa->ifbandwidth);
nsPerByte = ifnsPerByte / f;
ptime = (double)opts->pktsize * ifnsPerByte;
cptime = ptime * (1.0 - f) / f;
if (nsPerByte * (double)opts->maxpktsize > (double)INT_MAX) {
/*
* this causes integer overflow in kernel!
* (bandwidth < 6Kbps when max_pkt_size=1500)
*/
if (pa->bandwidth != 0 && (pf->opts & PF_OPT_QUIET) == 0)
warnx("queue bandwidth must be larger than %s",
rate2str(ifnsPerByte * (double)opts->maxpktsize /
(double)INT_MAX * (double)pa->ifbandwidth));
fprintf(stderr, "cbq: queue %s is too slow!\n",
pa->qname);
nsPerByte = (double)(INT_MAX / opts->maxpktsize);
}
if (maxburst == 0) { /* use default */
if (cptime > 10.0 * 1000000)
maxburst = 4;
else
maxburst = 16;
}
if (minburst == 0) /* use default */
minburst = 2;
if (minburst > maxburst)
minburst = maxburst;
z = (double)(1 << RM_FILTER_GAIN);
g = (1.0 - 1.0 / z);
gton = pow(g, (double)maxburst);
gtom = pow(g, (double)(minburst-1));
maxidle = ((1.0 / f - 1.0) * ((1.0 - gton) / gton));
maxidle_s = (1.0 - g);
if (maxidle > maxidle_s)
maxidle = ptime * maxidle;
else
maxidle = ptime * maxidle_s;
offtime = cptime * (1.0 + 1.0/(1.0 - g) * (1.0 - gtom) / gtom);
minidle = -((double)opts->maxpktsize * (double)nsPerByte);
/* scale parameters */
maxidle = ((maxidle * 8.0) / nsPerByte) *
pow(2.0, (double)RM_FILTER_GAIN);
offtime = (offtime * 8.0) / nsPerByte *
pow(2.0, (double)RM_FILTER_GAIN);
minidle = ((minidle * 8.0) / nsPerByte) *
pow(2.0, (double)RM_FILTER_GAIN);
maxidle = maxidle / 1000.0;
offtime = offtime / 1000.0;
minidle = minidle / 1000.0;
opts->minburst = minburst;
opts->maxburst = maxburst;
opts->ns_per_byte = (u_int)nsPerByte;
opts->maxidle = (u_int)fabs(maxidle);
opts->minidle = (int)minidle;
opts->offtime = (u_int)fabs(offtime);
return (0);
}
static int
check_commit_cbq(int dev, int opts, struct pf_altq *pa)
{
struct pf_altq *altq;
int root_class, default_class;
int error = 0;
/*
* check if cbq has one root queue and one default queue
* for this interface
*/
root_class = default_class = 0;
TAILQ_FOREACH(altq, &altqs, entries) {
if (strncmp(altq->ifname, pa->ifname, IFNAMSIZ) != 0)
continue;
if (altq->qname[0] == 0) /* this is for interface */
continue;
if (altq->pq_u.cbq_opts.flags & CBQCLF_ROOTCLASS)
root_class++;
if (altq->pq_u.cbq_opts.flags & CBQCLF_DEFCLASS)
default_class++;
}
if (root_class != 1) {
warnx("should have one root queue on %s", pa->ifname);
error++;
}
if (default_class != 1) {
warnx("should have one default queue on %s", pa->ifname);
error++;
}
return (error);
}
static int
print_cbq_opts(const struct pf_altq *a)
{
const struct cbq_opts *opts;
opts = &a->pq_u.cbq_opts;
if (opts->flags) {
printf("cbq(");
if (opts->flags & CBQCLF_RED)
printf(" red");
if (opts->flags & CBQCLF_ECN)
printf(" ecn");
if (opts->flags & CBQCLF_RIO)
printf(" rio");
if (opts->flags & CBQCLF_CLEARDSCP)
printf(" cleardscp");
if (opts->flags & CBQCLF_FLOWVALVE)
printf(" flowvalve");
if (opts->flags & CBQCLF_BORROW)
printf(" borrow");
if (opts->flags & CBQCLF_WRR)
printf(" wrr");
if (opts->flags & CBQCLF_EFFICIENT)
printf(" efficient");
if (opts->flags & CBQCLF_ROOTCLASS)
printf(" root");
if (opts->flags & CBQCLF_DEFCLASS)
printf(" default");
printf(" ) ");
return (1);
} else
return (0);
}
/*
* PRIQ support functions
*/
static int
eval_pfqueue_priq(struct pfctl *pf, struct pf_altq *pa)
{
struct pf_altq *altq;
if (pa->priority >= PRIQ_MAXPRI) {
warnx("priority out of range: max %d", PRIQ_MAXPRI - 1);
return (-1);
}
/* the priority should be unique for the interface */
TAILQ_FOREACH(altq, &altqs, entries) {
if (strncmp(altq->ifname, pa->ifname, IFNAMSIZ) == 0 &&
altq->qname[0] != 0 && altq->priority == pa->priority) {
warnx("%s and %s have the same priority",
altq->qname, pa->qname);
return (-1);
}
}
return (0);
}
static int
check_commit_priq(int dev, int opts, struct pf_altq *pa)
{
struct pf_altq *altq;
int default_class;
int error = 0;
/*
* check if priq has one default class for this interface
*/
default_class = 0;
TAILQ_FOREACH(altq, &altqs, entries) {
if (strncmp(altq->ifname, pa->ifname, IFNAMSIZ) != 0)
continue;
if (altq->qname[0] == 0) /* this is for interface */
continue;
if (altq->pq_u.priq_opts.flags & PRCF_DEFAULTCLASS)
default_class++;
}
if (default_class != 1) {
warnx("should have one default queue on %s", pa->ifname);
error++;
}
return (error);
}
static int
print_priq_opts(const struct pf_altq *a)
{
const struct priq_opts *opts;
opts = &a->pq_u.priq_opts;
if (opts->flags) {
printf("priq(");
if (opts->flags & PRCF_RED)
printf(" red");
if (opts->flags & PRCF_ECN)
printf(" ecn");
if (opts->flags & PRCF_RIO)
printf(" rio");
if (opts->flags & PRCF_CLEARDSCP)
printf(" cleardscp");
if (opts->flags & PRCF_DEFAULTCLASS)
printf(" default");
printf(" ) ");
return (1);
} else
return (0);
}
/*
* HFSC support functions
*/
static int
eval_pfqueue_hfsc(struct pfctl *pf, struct pf_altq *pa)
{
struct pf_altq *altq, *parent;
struct hfsc_opts *opts;
struct service_curve sc;
opts = &pa->pq_u.hfsc_opts;
if (pa->parent[0] == 0) {
/* root queue */
opts->lssc_m1 = pa->ifbandwidth;
opts->lssc_m2 = pa->ifbandwidth;
opts->lssc_d = 0;
return (0);
}
LIST_INIT(&rtsc);
LIST_INIT(&lssc);
/* if link_share is not specified, use bandwidth */
if (opts->lssc_m2 == 0)
opts->lssc_m2 = pa->bandwidth;
if ((opts->rtsc_m1 > 0 && opts->rtsc_m2 == 0) ||
(opts->lssc_m1 > 0 && opts->lssc_m2 == 0) ||
(opts->ulsc_m1 > 0 && opts->ulsc_m2 == 0)) {
warnx("m2 is zero for %s", pa->qname);
return (-1);
}
if ((opts->rtsc_m1 < opts->rtsc_m2 && opts->rtsc_m1 != 0) ||
(opts->lssc_m1 < opts->lssc_m2 && opts->lssc_m1 != 0) ||
(opts->ulsc_m1 < opts->ulsc_m2 && opts->ulsc_m1 != 0)) {
warnx("m1 must be zero for convex curve: %s", pa->qname);
return (-1);
}
/*
* admission control:
* for the real-time service curve, the sum of the service curves
* should not exceed 80% of the interface bandwidth. 20% is reserved
* not to over-commit the actual interface bandwidth.
* for the linkshare service curve, the sum of the child service
* curve should not exceed the parent service curve.
* for the upper-limit service curve, the assigned bandwidth should
* be smaller than the interface bandwidth, and the upper-limit should
* be larger than the real-time service curve when both are defined.
*/
parent = qname_to_pfaltq(pa->parent, pa->ifname);
if (parent == NULL)
errx(1, "parent %s not found for %s", pa->parent, pa->qname);
TAILQ_FOREACH(altq, &altqs, entries) {
if (strncmp(altq->ifname, pa->ifname, IFNAMSIZ) != 0)
continue;
if (altq->qname[0] == 0) /* this is for interface */
continue;
/* if the class has a real-time service curve, add it. */
if (opts->rtsc_m2 != 0 && altq->pq_u.hfsc_opts.rtsc_m2 != 0) {
sc.m1 = altq->pq_u.hfsc_opts.rtsc_m1;
sc.d = altq->pq_u.hfsc_opts.rtsc_d;
sc.m2 = altq->pq_u.hfsc_opts.rtsc_m2;
gsc_add_sc(&rtsc, &sc);
}
if (strncmp(altq->parent, pa->parent, PF_QNAME_SIZE) != 0)
continue;
/* if the class has a linkshare service curve, add it. */
if (opts->lssc_m2 != 0 && altq->pq_u.hfsc_opts.lssc_m2 != 0) {
sc.m1 = altq->pq_u.hfsc_opts.lssc_m1;
sc.d = altq->pq_u.hfsc_opts.lssc_d;
sc.m2 = altq->pq_u.hfsc_opts.lssc_m2;
gsc_add_sc(&lssc, &sc);
}
}
/* check the real-time service curve. reserve 20% of interface bw */
if (opts->rtsc_m2 != 0) {
/* add this queue to the sum */
sc.m1 = opts->rtsc_m1;
sc.d = opts->rtsc_d;
sc.m2 = opts->rtsc_m2;
gsc_add_sc(&rtsc, &sc);
/* compare the sum with 80% of the interface */
sc.m1 = 0;
sc.d = 0;
sc.m2 = pa->ifbandwidth / 100 * 80;
if (!is_gsc_under_sc(&rtsc, &sc)) {
warnx("real-time sc exceeds 80%% of the interface "
"bandwidth (%s)", rate2str((double)sc.m2));
goto err_ret;
}
}
/* check the linkshare service curve. */
if (opts->lssc_m2 != 0) {
/* add this queue to the child sum */
sc.m1 = opts->lssc_m1;
sc.d = opts->lssc_d;
sc.m2 = opts->lssc_m2;
gsc_add_sc(&lssc, &sc);
/* compare the sum of the children with parent's sc */
sc.m1 = parent->pq_u.hfsc_opts.lssc_m1;
sc.d = parent->pq_u.hfsc_opts.lssc_d;
sc.m2 = parent->pq_u.hfsc_opts.lssc_m2;
if (!is_gsc_under_sc(&lssc, &sc)) {
warnx("linkshare sc exceeds parent's sc");
goto err_ret;
}
}
/* check the upper-limit service curve. */
if (opts->ulsc_m2 != 0) {
if (opts->ulsc_m1 > pa->ifbandwidth ||
opts->ulsc_m2 > pa->ifbandwidth) {
warnx("upper-limit larger than interface bandwidth");
goto err_ret;
}
if (opts->rtsc_m2 != 0 && opts->rtsc_m2 > opts->ulsc_m2) {
warnx("upper-limit sc smaller than real-time sc");
goto err_ret;
}
}
gsc_destroy(&rtsc);
gsc_destroy(&lssc);
return (0);
err_ret:
gsc_destroy(&rtsc);
gsc_destroy(&lssc);
return (-1);
}
static int
check_commit_hfsc(int dev, int opts, struct pf_altq *pa)
{
struct pf_altq *altq, *def = NULL;
int default_class;
int error = 0;
/* check if hfsc has one default queue for this interface */
default_class = 0;
TAILQ_FOREACH(altq, &altqs, entries) {
if (strncmp(altq->ifname, pa->ifname, IFNAMSIZ) != 0)
continue;
if (altq->qname[0] == 0) /* this is for interface */
continue;
if (altq->parent[0] == 0) /* dummy root */
continue;
if (altq->pq_u.hfsc_opts.flags & HFCF_DEFAULTCLASS) {
default_class++;
def = altq;
}
}
if (default_class != 1) {
warnx("should have one default queue on %s", pa->ifname);
return (1);
}
/* make sure the default queue is a leaf */
TAILQ_FOREACH(altq, &altqs, entries) {
if (strncmp(altq->ifname, pa->ifname, IFNAMSIZ) != 0)
continue;
if (altq->qname[0] == 0) /* this is for interface */
continue;
if (strncmp(altq->parent, def->qname, PF_QNAME_SIZE) == 0) {
warnx("default queue is not a leaf");
error++;
}
}
return (error);
}
static int
print_hfsc_opts(const struct pf_altq *a, const struct node_queue_opt *qopts)
{
const struct hfsc_opts *opts;
const struct node_hfsc_sc *rtsc, *lssc, *ulsc;
opts = &a->pq_u.hfsc_opts;
if (qopts == NULL)
rtsc = lssc = ulsc = NULL;
else {
rtsc = &qopts->data.hfsc_opts.realtime;
lssc = &qopts->data.hfsc_opts.linkshare;
ulsc = &qopts->data.hfsc_opts.upperlimit;
}
if (opts->flags || opts->rtsc_m2 != 0 || opts->ulsc_m2 != 0 ||
(opts->lssc_m2 != 0 && (opts->lssc_m2 != a->bandwidth ||
opts->lssc_d != 0))) {
printf("hfsc(");
if (opts->flags & HFCF_RED)
printf(" red");
if (opts->flags & HFCF_ECN)
printf(" ecn");
if (opts->flags & HFCF_RIO)
printf(" rio");
if (opts->flags & HFCF_CLEARDSCP)
printf(" cleardscp");
if (opts->flags & HFCF_DEFAULTCLASS)
printf(" default");
if (opts->rtsc_m2 != 0)
print_hfsc_sc("realtime", opts->rtsc_m1, opts->rtsc_d,
opts->rtsc_m2, rtsc);
if (opts->lssc_m2 != 0 && (opts->lssc_m2 != a->bandwidth ||
opts->lssc_d != 0))
print_hfsc_sc("linkshare", opts->lssc_m1, opts->lssc_d,
opts->lssc_m2, lssc);
if (opts->ulsc_m2 != 0)
print_hfsc_sc("upperlimit", opts->ulsc_m1, opts->ulsc_d,
opts->ulsc_m2, ulsc);
printf(" ) ");
return (1);
} else
return (0);
}
/*
* admission control using generalized service curve
*/
/* add a new service curve to a generalized service curve */
static void
gsc_add_sc(struct gen_sc *gsc, struct service_curve *sc)
{
if (is_sc_null(sc))
return;
if (sc->d != 0)
gsc_add_seg(gsc, 0.0, 0.0, (double)sc->d, (double)sc->m1);
gsc_add_seg(gsc, (double)sc->d, 0.0, INFINITY, (double)sc->m2);
}
/*
* check whether all points of a generalized service curve have
* their y-coordinates no larger than a given two-piece linear
* service curve.
*/
static int
is_gsc_under_sc(struct gen_sc *gsc, struct service_curve *sc)
{
struct segment *s, *last, *end;
double y;
if (is_sc_null(sc)) {
if (LIST_EMPTY(gsc))
return (1);
LIST_FOREACH(s, gsc, _next) {
if (s->m != 0)
return (0);
}
return (1);
}
/*
* gsc has a dummy entry at the end with x = INFINITY.
* loop through up to this dummy entry.
*/
end = gsc_getentry(gsc, INFINITY);
if (end == NULL)
return (1);
last = NULL;
for (s = LIST_FIRST(gsc); s != end; s = LIST_NEXT(s, _next)) {
if (s->y > sc_x2y(sc, s->x))
return (0);
last = s;
}
/* last now holds the real last segment */
if (last == NULL)
return (1);
if (last->m > sc->m2)
return (0);
if (last->x < sc->d && last->m > sc->m1) {
y = last->y + (sc->d - last->x) * last->m;
if (y > sc_x2y(sc, sc->d))
return (0);
}
return (1);
}
static void
gsc_destroy(struct gen_sc *gsc)
{
struct segment *s;
while ((s = LIST_FIRST(gsc)) != NULL) {
LIST_REMOVE(s, _next);
free(s);
}
}
/*
* return a segment entry starting at x.
* if gsc has no entry starting at x, a new entry is created at x.
*/
static struct segment *
gsc_getentry(struct gen_sc *gsc, double x)
{
struct segment *new, *prev, *s;
prev = NULL;
LIST_FOREACH(s, gsc, _next) {
if (s->x == x)
return (s); /* matching entry found */
else if (s->x < x)
prev = s;
else
break;
}
/* we have to create a new entry */
if ((new = calloc(1, sizeof(struct segment))) == NULL)
return (NULL);
new->x = x;
if (x == INFINITY || s == NULL)
new->d = 0;
else if (s->x == INFINITY)
new->d = INFINITY;
else
new->d = s->x - x;
if (prev == NULL) {
/* insert the new entry at the head of the list */
new->y = 0;
new->m = 0;