Put dummynet-related code in a separate file.

To this purpose, add prototypes for global functions in ipfw2.h
and move there also the list of tokens used in various places in the code.

1 files changed, 717 insertions, 0 deletions

diff --git a/sbin/ipfw/dummynet.c b/sbin/ipfw/dummynet.c
new file mode 100644
index 0000000..32fee7d
--- /dev/null
+++ b/sbin/ipfw/dummynet.c
@@ -0,0 +1,717 @@
+/*
+ * Copyright (c) 2002-2003 Luigi Rizzo
+ * Copyright (c) 1996 Alex Nash, Paul Traina, Poul-Henning Kamp
+ * Copyright (c) 1994 Ugen J.S.Antsilevich
+ *
+ * Idea and grammar partially left from:
+ * Copyright (c) 1993 Daniel Boulet
+ *
+ * Redistribution and use in source forms, with and without modification,
+ * are permitted provided that this entire comment appears intact.
+ *
+ * Redistribution in binary form may occur without any restrictions.
+ * Obviously, it would be nice if you gave credit where credit is due
+ * but requiring it would be too onerous.
+ *
+ * This software is provided ``AS IS'' without any warranties of any kind.
+ *
+ * NEW command line interface for IP firewall facility
+ *
+ * $FreeBSD$
+ *
+ * dummynet support
+ */
+
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <sys/sockio.h>
+#include <sys/sysctl.h>
+
+#include "ipfw2.h"
+
+#include <ctype.h>
+#include <err.h>
+#include <netdb.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sysexits.h>
+
+#include <net/if.h>
+#include <netinet/in.h>
+#include <netinet/in_systm.h>
+#include <netinet/ip.h>
+#include <netinet/ip_fw.h>
+#include <netinet/ip_dummynet.h>
+#include <arpa/inet.h>
+
+static struct _s_x dummynet_params[] = {
+	{ "plr",		TOK_PLR },
+	{ "noerror",		TOK_NOERROR },
+	{ "buckets",		TOK_BUCKETS },
+	{ "dst-ip",		TOK_DSTIP },
+	{ "src-ip",		TOK_SRCIP },
+	{ "dst-port",		TOK_DSTPORT },
+	{ "src-port",		TOK_SRCPORT },
+	{ "proto",		TOK_PROTO },
+	{ "weight",		TOK_WEIGHT },
+	{ "all",		TOK_ALL },
+	{ "mask",		TOK_MASK },
+	{ "droptail",		TOK_DROPTAIL },
+	{ "red",		TOK_RED },
+	{ "gred",		TOK_GRED },
+	{ "bw",			TOK_BW },
+	{ "bandwidth",		TOK_BW },
+	{ "delay",		TOK_DELAY },
+	{ "pipe",		TOK_PIPE },
+	{ "queue",		TOK_QUEUE },
+	{ "flow-id",		TOK_FLOWID},
+	{ "dst-ipv6",		TOK_DSTIP6},
+	{ "dst-ip6",		TOK_DSTIP6},
+	{ "src-ipv6",		TOK_SRCIP6},
+	{ "src-ip6",		TOK_SRCIP6},
+	{ "dummynet-params",	TOK_NULL },
+	{ NULL, 0 }	/* terminator */
+};
+
+static int
+sort_q(const void *pa, const void *pb)
+{
+	int rev = (co.do_sort < 0);
+	int field = rev ? -co.do_sort : co.do_sort;
+	long long res = 0;
+	const struct dn_flow_queue *a = pa;
+	const struct dn_flow_queue *b = pb;
+
+	switch (field) {
+	case 1: /* pkts */
+		res = a->len - b->len;
+		break;
+	case 2: /* bytes */
+		res = a->len_bytes - b->len_bytes;
+		break;
+
+	case 3: /* tot pkts */
+		res = a->tot_pkts - b->tot_pkts;
+		break;
+
+	case 4: /* tot bytes */
+		res = a->tot_bytes - b->tot_bytes;
+		break;
+	}
+	if (res < 0)
+		res = -1;
+	if (res > 0)
+		res = 1;
+	return (int)(rev ? res : -res);
+}
+
+static void
+list_queues(struct dn_flow_set *fs, struct dn_flow_queue *q)
+{
+	int l;
+	int index_printed, indexes = 0;
+	char buff[255];
+	struct protoent *pe;
+
+	if (fs->rq_elements == 0)
+		return;
+
+	if (co.do_sort != 0)
+		heapsort(q, fs->rq_elements, sizeof *q, sort_q);
+
+	/* Print IPv4 flows */
+	index_printed = 0;
+	for (l = 0; l < fs->rq_elements; l++) {
+		struct in_addr ina;
+
+		/* XXX: Should check for IPv4 flows */
+		if (IS_IP6_FLOW_ID(&(q[l].id)))
+			continue;
+
+		if (!index_printed) {
+			index_printed = 1;
+			if (indexes > 0)	/* currently a no-op */
+				printf("\n");
+			indexes++;
+			printf("    "
+			    "mask: 0x%02x 0x%08x/0x%04x -> 0x%08x/0x%04x\n",
+			    fs->flow_mask.proto,
+			    fs->flow_mask.src_ip, fs->flow_mask.src_port,
+			    fs->flow_mask.dst_ip, fs->flow_mask.dst_port);
+
+			printf("BKT Prot ___Source IP/port____ "
+			    "____Dest. IP/port____ "
+			    "Tot_pkt/bytes Pkt/Byte Drp\n");
+		}
+
+		printf("%3d ", q[l].hash_slot);
+		pe = getprotobynumber(q[l].id.proto);
+		if (pe)
+			printf("%-4s ", pe->p_name);
+		else
+			printf("%4u ", q[l].id.proto);
+		ina.s_addr = htonl(q[l].id.src_ip);
+		printf("%15s/%-5d ",
+		    inet_ntoa(ina), q[l].id.src_port);
+		ina.s_addr = htonl(q[l].id.dst_ip);
+		printf("%15s/%-5d ",
+		    inet_ntoa(ina), q[l].id.dst_port);
+		printf("%4qu %8qu %2u %4u %3u\n",
+		    q[l].tot_pkts, q[l].tot_bytes,
+		    q[l].len, q[l].len_bytes, q[l].drops);
+		if (co.verbose)
+			printf("   S %20qd  F %20qd\n",
+			    q[l].S, q[l].F);
+	}
+
+	/* Print IPv6 flows */
+	index_printed = 0;
+	for (l = 0; l < fs->rq_elements; l++) {
+		if (!IS_IP6_FLOW_ID(&(q[l].id)))
+			continue;
+
+		if (!index_printed) {
+			index_printed = 1;
+			if (indexes > 0)
+				printf("\n");
+			indexes++;
+			printf("\n        mask: proto: 0x%02x, flow_id: 0x%08x,  ",
+			    fs->flow_mask.proto, fs->flow_mask.flow_id6);
+			inet_ntop(AF_INET6, &(fs->flow_mask.src_ip6),
+			    buff, sizeof(buff));
+			printf("%s/0x%04x -> ", buff, fs->flow_mask.src_port);
+			inet_ntop( AF_INET6, &(fs->flow_mask.dst_ip6),
+			    buff, sizeof(buff) );
+			printf("%s/0x%04x\n", buff, fs->flow_mask.dst_port);
+
+			printf("BKT ___Prot___ _flow-id_ "
+			    "______________Source IPv6/port_______________ "
+			    "_______________Dest. IPv6/port_______________ "
+			    "Tot_pkt/bytes Pkt/Byte Drp\n");
+		}
+		printf("%3d ", q[l].hash_slot);
+		pe = getprotobynumber(q[l].id.proto);
+		if (pe != NULL)
+			printf("%9s ", pe->p_name);
+		else
+			printf("%9u ", q[l].id.proto);
+		printf("%7d  %39s/%-5d ", q[l].id.flow_id6,
+		    inet_ntop(AF_INET6, &(q[l].id.src_ip6), buff, sizeof(buff)),
+		    q[l].id.src_port);
+		printf(" %39s/%-5d ",
+		    inet_ntop(AF_INET6, &(q[l].id.dst_ip6), buff, sizeof(buff)),
+		    q[l].id.dst_port);
+		printf(" %4qu %8qu %2u %4u %3u\n",
+		    q[l].tot_pkts, q[l].tot_bytes,
+		    q[l].len, q[l].len_bytes, q[l].drops);
+		if (co.verbose)
+			printf("   S %20qd  F %20qd\n", q[l].S, q[l].F);
+	}
+}
+
+static void
+print_flowset_parms(struct dn_flow_set *fs, char *prefix)
+{
+	int l;
+	char qs[30];
+	char plr[30];
+	char red[90];	/* Display RED parameters */
+
+	l = fs->qsize;
+	if (fs->flags_fs & DN_QSIZE_IS_BYTES) {
+		if (l >= 8192)
+			sprintf(qs, "%d KB", l / 1024);
+		else
+			sprintf(qs, "%d B", l);
+	} else
+		sprintf(qs, "%3d sl.", l);
+	if (fs->plr)
+		sprintf(plr, "plr %f", 1.0 * fs->plr / (double)(0x7fffffff));
+	else
+		plr[0] = '\0';
+	if (fs->flags_fs & DN_IS_RED)	/* RED parameters */
+		sprintf(red,
+		    "\n\t  %cRED w_q %f min_th %d max_th %d max_p %f",
+		    (fs->flags_fs & DN_IS_GENTLE_RED) ? 'G' : ' ',
+		    1.0 * fs->w_q / (double)(1 << SCALE_RED),
+		    SCALE_VAL(fs->min_th),
+		    SCALE_VAL(fs->max_th),
+		    1.0 * fs->max_p / (double)(1 << SCALE_RED));
+	else
+		sprintf(red, "droptail");
+
+	printf("%s %s%s %d queues (%d buckets) %s\n",
+	    prefix, qs, plr, fs->rq_elements, fs->rq_size, red);
+}
+
+void
+ipfw_list_pipes(void *data, uint nbytes, int ac, char *av[])
+{
+	int rulenum;
+	void *next = data;
+	struct dn_pipe *p = (struct dn_pipe *) data;
+	struct dn_flow_set *fs;
+	struct dn_flow_queue *q;
+	int l;
+
+	if (ac > 0)
+		rulenum = strtoul(*av++, NULL, 10);
+	else
+		rulenum = 0;
+	for (; nbytes >= sizeof *p; p = (struct dn_pipe *)next) {
+		double b = p->bandwidth;
+		char buf[30];
+		char prefix[80];
+
+		if (SLIST_NEXT(p, next) != (struct dn_pipe *)DN_IS_PIPE)
+			break;	/* done with pipes, now queues */
+
+		/*
+		 * compute length, as pipe have variable size
+		 */
+		l = sizeof(*p) + p->fs.rq_elements * sizeof(*q);
+		next = (char *)p + l;
+		nbytes -= l;
+
+		if ((rulenum != 0 && rulenum != p->pipe_nr) || co.do_pipe == 2)
+			continue;
+
+		/*
+		 * Print rate (or clocking interface)
+		 */
+		if (p->if_name[0] != '\0')
+			sprintf(buf, "%s", p->if_name);
+		else if (b == 0)
+			sprintf(buf, "unlimited");
+		else if (b >= 1000000)
+			sprintf(buf, "%7.3f Mbit/s", b/1000000);
+		else if (b >= 1000)
+			sprintf(buf, "%7.3f Kbit/s", b/1000);
+		else
+			sprintf(buf, "%7.3f bit/s ", b);
+
+		sprintf(prefix, "%05d: %s %4d ms ",
+		    p->pipe_nr, buf, p->delay);
+		print_flowset_parms(&(p->fs), prefix);
+		if (co.verbose)
+			printf("   V %20qd\n", p->V >> MY_M);
+
+		q = (struct dn_flow_queue *)(p+1);
+		list_queues(&(p->fs), q);
+	}
+	for (fs = next; nbytes >= sizeof *fs; fs = next) {
+		char prefix[80];
+
+		if (SLIST_NEXT(fs, next) != (struct dn_flow_set *)DN_IS_QUEUE)
+			break;
+		l = sizeof(*fs) + fs->rq_elements * sizeof(*q);
+		next = (char *)fs + l;
+		nbytes -= l;
+
+		if (rulenum != 0 && ((rulenum != fs->fs_nr && co.do_pipe == 2) ||
+		    (rulenum != fs->parent_nr && co.do_pipe == 1))) {
+			continue;
+		}
+
+		q = (struct dn_flow_queue *)(fs+1);
+		sprintf(prefix, "q%05d: weight %d pipe %d ",
+		    fs->fs_nr, fs->weight, fs->parent_nr);
+		print_flowset_parms(fs, prefix);
+		list_queues(fs, q);
+	}
+}
+
+/*
+ * Delete pipe or queue i
+ */
+int
+ipfw_delete_pipe(int pipe_or_queue, int n)
+{
+	struct dn_pipe p;
+	int i;
+
+	memset(&p, 0, sizeof p);
+	if (pipe_or_queue == 1)
+		p.pipe_nr = i;		/* pipe */
+	else
+		p.fs.fs_nr = i;		/* queue */
+	i = do_cmd(IP_DUMMYNET_DEL, &p, sizeof p);
+	if (i) {
+		i = 1;
+		warn("rule %u: setsockopt(IP_DUMMYNET_DEL)", i);
+	}
+	return i;
+}
+
+void
+ipfw_config_pipe(int ac, char **av)
+{
+	struct dn_pipe p;
+	int i;
+	char *end;
+	void *par = NULL;
+
+	memset(&p, 0, sizeof p);
+
+	av++; ac--;
+	/* Pipe number */
+	if (ac && isdigit(**av)) {
+		i = atoi(*av); av++; ac--;
+		if (co.do_pipe == 1)
+			p.pipe_nr = i;
+		else
+			p.fs.fs_nr = i;
+	}
+	while (ac > 0) {
+		double d;
+		int tok = match_token(dummynet_params, *av);
+		ac--; av++;
+
+		switch(tok) {
+		case TOK_NOERROR:
+			p.fs.flags_fs |= DN_NOERROR;
+			break;
+
+		case TOK_PLR:
+			NEED1("plr needs argument 0..1\n");
+			d = strtod(av[0], NULL);
+			if (d > 1)
+				d = 1;
+			else if (d < 0)
+				d = 0;
+			p.fs.plr = (int)(d*0x7fffffff);
+			ac--; av++;
+			break;
+
+		case TOK_QUEUE:
+			NEED1("queue needs queue size\n");
+			end = NULL;
+			p.fs.qsize = strtoul(av[0], &end, 0);
+			if (*end == 'K' || *end == 'k') {
+				p.fs.flags_fs |= DN_QSIZE_IS_BYTES;
+				p.fs.qsize *= 1024;
+			} else if (*end == 'B' ||
+			    _substrcmp2(end, "by", "bytes") == 0) {
+				p.fs.flags_fs |= DN_QSIZE_IS_BYTES;
+			}
+			ac--; av++;
+			break;
+
+		case TOK_BUCKETS:
+			NEED1("buckets needs argument\n");
+			p.fs.rq_size = strtoul(av[0], NULL, 0);
+			ac--; av++;
+			break;
+
+		case TOK_MASK:
+			NEED1("mask needs mask specifier\n");
+			/*
+			 * per-flow queue, mask is dst_ip, dst_port,
+			 * src_ip, src_port, proto measured in bits
+			 */
+			par = NULL;
+
+			bzero(&p.fs.flow_mask, sizeof(p.fs.flow_mask));
+			end = NULL;
+
+			while (ac >= 1) {
+			    uint32_t *p32 = NULL;
+			    uint16_t *p16 = NULL;
+			    uint32_t *p20 = NULL;
+			    struct in6_addr *pa6 = NULL;
+			    uint32_t a;
+
+			    tok = match_token(dummynet_params, *av);
+			    ac--; av++;
+			    switch(tok) {
+			    case TOK_ALL:
+				    /*
+				     * special case, all bits significant
+				     */
+				    p.fs.flow_mask.dst_ip = ~0;
+				    p.fs.flow_mask.src_ip = ~0;
+				    p.fs.flow_mask.dst_port = ~0;
+				    p.fs.flow_mask.src_port = ~0;
+				    p.fs.flow_mask.proto = ~0;
+				    n2mask(&(p.fs.flow_mask.dst_ip6), 128);
+				    n2mask(&(p.fs.flow_mask.src_ip6), 128);
+				    p.fs.flow_mask.flow_id6 = ~0;
+				    p.fs.flags_fs |= DN_HAVE_FLOW_MASK;
+				    goto end_mask;
+
+			    case TOK_DSTIP:
+				    p32 = &p.fs.flow_mask.dst_ip;
+				    break;
+
+			    case TOK_SRCIP:
+				    p32 = &p.fs.flow_mask.src_ip;
+				    break;
+
+			    case TOK_DSTIP6:
+				    pa6 = &(p.fs.flow_mask.dst_ip6);
+				    break;
+			    
+			    case TOK_SRCIP6:
+				    pa6 = &(p.fs.flow_mask.src_ip6);
+				    break;
+
+			    case TOK_FLOWID:
+				    p20 = &p.fs.flow_mask.flow_id6;
+				    break;
+
+			    case TOK_DSTPORT:
+				    p16 = &p.fs.flow_mask.dst_port;
+				    break;
+
+			    case TOK_SRCPORT:
+				    p16 = &p.fs.flow_mask.src_port;
+				    break;
+
+			    case TOK_PROTO:
+				    break;
+
+			    default:
+				    ac++; av--; /* backtrack */
+				    goto end_mask;
+			    }
+			    if (ac < 1)
+				    errx(EX_USAGE, "mask: value missing");
+			    if (*av[0] == '/') {
+				    a = strtoul(av[0]+1, &end, 0);
+				    if (pa6 == NULL)
+					    a = (a == 32) ? ~0 : (1 << a) - 1;
+			    } else
+				    a = strtoul(av[0], &end, 0);
+			    if (p32 != NULL)
+				    *p32 = a;
+			    else if (p16 != NULL) {
+				    if (a > 0xFFFF)
+					    errx(EX_DATAERR,
+						"port mask must be 16 bit");
+				    *p16 = (uint16_t)a;
+			    } else if (p20 != NULL) {
+				    if (a > 0xfffff)
+					errx(EX_DATAERR,
+					    "flow_id mask must be 20 bit");
+				    *p20 = (uint32_t)a;
+			    } else if (pa6 != NULL) {
+				    if (a > 128)
+					errx(EX_DATAERR,
+					    "in6addr invalid mask len");
+				    else
+					n2mask(pa6, a);
+			    } else {
+				    if (a > 0xFF)
+					    errx(EX_DATAERR,
+						"proto mask must be 8 bit");
+				    p.fs.flow_mask.proto = (uint8_t)a;
+			    }
+			    if (a != 0)
+				    p.fs.flags_fs |= DN_HAVE_FLOW_MASK;
+			    ac--; av++;
+			} /* end while, config masks */
+end_mask:
+			break;
+
+		case TOK_RED:
+		case TOK_GRED:
+			NEED1("red/gred needs w_q/min_th/max_th/max_p\n");
+			p.fs.flags_fs |= DN_IS_RED;
+			if (tok == TOK_GRED)
+				p.fs.flags_fs |= DN_IS_GENTLE_RED;
+			/*
+			 * the format for parameters is w_q/min_th/max_th/max_p
+			 */
+			if ((end = strsep(&av[0], "/"))) {
+			    double w_q = strtod(end, NULL);
+			    if (w_q > 1 || w_q <= 0)
+				errx(EX_DATAERR, "0 < w_q <= 1");
+			    p.fs.w_q = (int) (w_q * (1 << SCALE_RED));
+			}
+			if ((end = strsep(&av[0], "/"))) {
+			    p.fs.min_th = strtoul(end, &end, 0);
+			    if (*end == 'K' || *end == 'k')
+				p.fs.min_th *= 1024;
+			}
+			if ((end = strsep(&av[0], "/"))) {
+			    p.fs.max_th = strtoul(end, &end, 0);
+			    if (*end == 'K' || *end == 'k')
+				p.fs.max_th *= 1024;
+			}
+			if ((end = strsep(&av[0], "/"))) {
+			    double max_p = strtod(end, NULL);
+			    if (max_p > 1 || max_p <= 0)
+				errx(EX_DATAERR, "0 < max_p <= 1");
+			    p.fs.max_p = (int)(max_p * (1 << SCALE_RED));
+			}
+			ac--; av++;
+			break;
+
+		case TOK_DROPTAIL:
+			p.fs.flags_fs &= ~(DN_IS_RED|DN_IS_GENTLE_RED);
+			break;
+
+		case TOK_BW:
+			NEED1("bw needs bandwidth or interface\n");
+			if (co.do_pipe != 1)
+			    errx(EX_DATAERR, "bandwidth only valid for pipes");
+			/*
+			 * set clocking interface or bandwidth value
+			 */
+			if (av[0][0] >= 'a' && av[0][0] <= 'z') {
+			    int l = sizeof(p.if_name)-1;
+			    /* interface name */
+			    strncpy(p.if_name, av[0], l);
+			    p.if_name[l] = '\0';
+			    p.bandwidth = 0;
+			} else {
+			    p.if_name[0] = '\0';
+			    p.bandwidth = strtoul(av[0], &end, 0);
+			    if (*end == 'K' || *end == 'k') {
+				end++;
+				p.bandwidth *= 1000;
+			    } else if (*end == 'M') {
+				end++;
+				p.bandwidth *= 1000000;
+			    }
+			    if ((*end == 'B' &&
+				  _substrcmp2(end, "Bi", "Bit/s") != 0) ||
+			        _substrcmp2(end, "by", "bytes") == 0)
+				p.bandwidth *= 8;
+			    if (p.bandwidth < 0)
+				errx(EX_DATAERR, "bandwidth too large");
+			}
+			ac--; av++;
+			break;
+
+		case TOK_DELAY:
+			if (co.do_pipe != 1)
+				errx(EX_DATAERR, "delay only valid for pipes");
+			NEED1("delay needs argument 0..10000ms\n");
+			p.delay = strtoul(av[0], NULL, 0);
+			ac--; av++;
+			break;
+
+		case TOK_WEIGHT:
+			if (co.do_pipe == 1)
+				errx(EX_DATAERR,"weight only valid for queues");
+			NEED1("weight needs argument 0..100\n");
+			p.fs.weight = strtoul(av[0], &end, 0);
+			ac--; av++;
+			break;
+
+		case TOK_PIPE:
+			if (co.do_pipe == 1)
+				errx(EX_DATAERR,"pipe only valid for queues");
+			NEED1("pipe needs pipe_number\n");
+			p.fs.parent_nr = strtoul(av[0], &end, 0);
+			ac--; av++;
+			break;
+
+		default:
+			errx(EX_DATAERR, "unrecognised option ``%s''", av[-1]);
+		}
+	}
+	if (co.do_pipe == 1) {
+		if (p.pipe_nr == 0)
+			errx(EX_DATAERR, "pipe_nr must be > 0");
+		if (p.delay > 10000)
+			errx(EX_DATAERR, "delay must be < 10000");
+	} else { /* co.do_pipe == 2, queue */
+		if (p.fs.parent_nr == 0)
+			errx(EX_DATAERR, "pipe must be > 0");
+		if (p.fs.weight >100)
+			errx(EX_DATAERR, "weight must be <= 100");
+	}
+	if (p.fs.flags_fs & DN_QSIZE_IS_BYTES) {
+		size_t len;
+		long limit;
+
+		len = sizeof(limit);
+		if (sysctlbyname("net.inet.ip.dummynet.pipe_byte_limit",
+			&limit, &len, NULL, 0) == -1)
+			limit = 1024*1024;
+		if (p.fs.qsize > limit)
+			errx(EX_DATAERR, "queue size must be < %ldB", limit);
+	} else {
+		size_t len;
+		long limit;
+
+		len = sizeof(limit);
+		if (sysctlbyname("net.inet.ip.dummynet.pipe_slot_limit",
+			&limit, &len, NULL, 0) == -1)
+			limit = 100;
+		if (p.fs.qsize > limit)
+			errx(EX_DATAERR, "2 <= queue size <= %ld", limit);
+	}
+	if (p.fs.flags_fs & DN_IS_RED) {
+		size_t len;
+		int lookup_depth, avg_pkt_size;
+		double s, idle, weight, w_q;
+		struct clockinfo ck;
+		int t;
+
+		if (p.fs.min_th >= p.fs.max_th)
+		    errx(EX_DATAERR, "min_th %d must be < than max_th %d",
+			p.fs.min_th, p.fs.max_th);
+		if (p.fs.max_th == 0)
+		    errx(EX_DATAERR, "max_th must be > 0");
+
+		len = sizeof(int);
+		if (sysctlbyname("net.inet.ip.dummynet.red_lookup_depth",
+			&lookup_depth, &len, NULL, 0) == -1)
+		    errx(1, "sysctlbyname(\"%s\")",
+			"net.inet.ip.dummynet.red_lookup_depth");
+		if (lookup_depth == 0)
+		    errx(EX_DATAERR, "net.inet.ip.dummynet.red_lookup_depth"
+			" must be greater than zero");
+
+		len = sizeof(int);
+		if (sysctlbyname("net.inet.ip.dummynet.red_avg_pkt_size",
+			&avg_pkt_size, &len, NULL, 0) == -1)
+
+		    errx(1, "sysctlbyname(\"%s\")",
+			"net.inet.ip.dummynet.red_avg_pkt_size");
+		if (avg_pkt_size == 0)
+			errx(EX_DATAERR,
+			    "net.inet.ip.dummynet.red_avg_pkt_size must"
+			    " be greater than zero");
+
+		len = sizeof(struct clockinfo);
+		if (sysctlbyname("kern.clockrate", &ck, &len, NULL, 0) == -1)
+			errx(1, "sysctlbyname(\"%s\")", "kern.clockrate");
+
+		/*
+		 * Ticks needed for sending a medium-sized packet.
+		 * Unfortunately, when we are configuring a WF2Q+ queue, we
+		 * do not have bandwidth information, because that is stored
+		 * in the parent pipe, and also we have multiple queues
+		 * competing for it. So we set s=0, which is not very
+		 * correct. But on the other hand, why do we want RED with
+		 * WF2Q+ ?
+		 */
+		if (p.bandwidth==0) /* this is a WF2Q+ queue */
+			s = 0;
+		else
+			s = (double)ck.hz * avg_pkt_size * 8 / p.bandwidth;
+
+		/*
+		 * max idle time (in ticks) before avg queue size becomes 0.
+		 * NOTA:  (3/w_q) is approx the value x so that
+		 * (1-w_q)^x < 10^-3.
+		 */
+		w_q = ((double)p.fs.w_q) / (1 << SCALE_RED);
+		idle = s * 3. / w_q;
+		p.fs.lookup_step = (int)idle / lookup_depth;
+		if (!p.fs.lookup_step)
+			p.fs.lookup_step = 1;
+		weight = 1 - w_q;
+		for (t = p.fs.lookup_step; t > 1; --t)
+			weight *= 1 - w_q;
+		p.fs.lookup_weight = (int)(weight * (1 << SCALE_RED));
+	}
+	i = do_cmd(IP_DUMMYNET_CONFIGURE, &p, sizeof p);
+	if (i)
+		err(1, "setsockopt(%s)", "IP_DUMMYNET_CONFIGURE");
+}