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dummynet.c
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/*
* Codel/FQ_Codel and PIE/FQ_PIE Code:
* Copyright (C) 2016 Centre for Advanced Internet Architectures,
* Swinburne University of Technology, Melbourne, Australia.
* Portions of this code were made possible in part by a gift from
* The Comcast Innovation Fund.
* Implemented by Rasool Al-Saadi <[email protected]>
*
* Copyright (c) 2002-2003,2010 Luigi Rizzo
*
* 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.
*
* $FreeBSD$
*
* dummynet support
*/
#define NEW_AQM
#include <sys/types.h>
#include <sys/socket.h>
/* XXX there are several sysctl leftover here */
#include <sys/sysctl.h>
#include "ipfw2.h"
#ifdef NEW_AQM
#include <stdint.h>
#endif
#include <ctype.h>
#include <err.h>
#include <errno.h>
#include <libutil.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/ip_fw.h>
#include <netinet/ip_dummynet.h>
#include <arpa/inet.h> /* inet_ntoa */
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 },
{ "lmax", TOK_LMAX },
{ "maxlen", TOK_LMAX },
{ "all", TOK_ALL },
{ "mask", TOK_MASK }, /* alias for both */
{ "sched_mask", TOK_SCHED_MASK },
{ "flow_mask", TOK_FLOW_MASK },
{ "droptail", TOK_DROPTAIL },
{ "ecn", TOK_ECN },
{ "red", TOK_RED },
{ "gred", TOK_GRED },
#ifdef NEW_AQM
{ "codel", TOK_CODEL}, /* Codel AQM */
{ "fq_codel", TOK_FQ_CODEL}, /* FQ-Codel */
{ "pie", TOK_PIE}, /* PIE AQM */
{ "fq_pie", TOK_FQ_PIE}, /* FQ-PIE */
#endif
{ "bw", TOK_BW },
{ "bandwidth", TOK_BW },
{ "delay", TOK_DELAY },
{ "link", TOK_LINK },
{ "pipe", TOK_PIPE },
{ "queue", TOK_QUEUE },
{ "flowset", TOK_FLOWSET },
{ "sched", TOK_SCHED },
{ "pri", TOK_PRI },
{ "priority", TOK_PRI },
{ "type", TOK_TYPE },
{ "flow-id", TOK_FLOWID},
{ "dst-ipv6", TOK_DSTIP6},
{ "dst-ip6", TOK_DSTIP6},
{ "src-ipv6", TOK_SRCIP6},
{ "src-ip6", TOK_SRCIP6},
{ "profile", TOK_PROFILE},
{ "burst", TOK_BURST},
{ "dummynet-params", TOK_NULL },
{ NULL, 0 } /* terminator */
};
#ifdef NEW_AQM
/* AQM/extra sched parameters tokens*/
static struct _s_x aqm_params[] = {
{ "target", TOK_TARGET},
{ "interval", TOK_INTERVAL},
{ "limit", TOK_LIMIT},
{ "flows", TOK_FLOWS},
{ "quantum", TOK_QUANTUM},
{ "ecn", TOK_ECN},
{ "noecn", TOK_NO_ECN},
{ "tupdate", TOK_TUPDATE},
{ "max_burst", TOK_MAX_BURST},
{ "max_ecnth", TOK_MAX_ECNTH},
{ "alpha", TOK_ALPHA},
{ "beta", TOK_BETA},
{ "capdrop", TOK_CAPDROP},
{ "nocapdrop", TOK_NO_CAPDROP},
{ "onoff", TOK_ONOFF},
{ "dre", TOK_DRE},
{ "ts", TOK_TS},
{ "derand", TOK_DERAND},
{ "noderand", TOK_NO_DERAND},
{ NULL, 0 } /* terminator */
};
#endif
#define O_NEXT(p, len) ((void *)((char *)p + len))
static void
oid_fill(struct dn_id *oid, int len, int type, uintptr_t id)
{
oid->len = len;
oid->type = type;
oid->subtype = 0;
oid->id = id;
}
/* make room in the buffer and move the pointer forward */
static void *
o_next(struct dn_id **o, int len, int type)
{
struct dn_id *ret = *o;
oid_fill(ret, len, type, 0);
*o = O_NEXT(*o, len);
return ret;
}
#ifdef NEW_AQM
/* Codel flags */
enum {
CODEL_ECN_ENABLED = 1
};
/* PIE flags, from PIE kernel module */
enum {
PIE_ECN_ENABLED = 1,
PIE_CAPDROP_ENABLED = 2,
PIE_ON_OFF_MODE_ENABLED = 4,
PIE_DEPRATEEST_ENABLED = 8,
PIE_DERAND_ENABLED = 16
};
#define PIE_FIX_POINT_BITS 13
#define PIE_SCALE (1L<<PIE_FIX_POINT_BITS)
/* integer to time */
void
us_to_time(int t,char *strt)
{
if (t < 0)
strt[0]='\0';
else if ( t==0 )
sprintf(strt,"%d", t);
else if (t< 1000)
sprintf(strt,"%dus", t);
else if (t < 1000000)
sprintf(strt,"%gms", (float) t / 1000);
else
sprintf(strt,"%gfs", (float) t / 1000000);
}
/*
* returns -1 if s is not a valid time, otherwise, return time in us
*/
static long
time_to_us(const char *s)
{
int i, dots = 0;
int len = strlen(s);
char strt[16]="", stru[16]="";
if (len>15)
return -1;
for (i = 0; i<len && (isdigit(s[i]) || s[i]=='.') ; i++)
if (s[i]=='.') {
if (dots)
return -1;
else
dots++;
}
if (!i)
return -1;
strncpy(strt, s, i);
if (i<len)
strcpy(stru, s+i);
else
strcpy(stru, "ms");
if (!strcasecmp(stru, "us"))
return atol(strt);
if (!strcasecmp(stru, "ms"))
return (strtod(strt, NULL) * 1000);
if (!strcasecmp(stru, "s"))
return (strtod(strt, NULL)*1000000);
return -1;
}
/* Get AQM or scheduler extra parameters */
void
get_extra_parms(uint32_t nr, char *out, int subtype)
{
struct dn_extra_parms *ep;
int ret;
char strt1[15], strt2[15], strt3[15];
u_int l;
/* prepare the request */
l = sizeof(struct dn_extra_parms);
ep = safe_calloc(1, l);
memset(ep, 0, sizeof(*ep));
*out = '\0';
oid_fill(&ep->oid, l, DN_CMD_GET, DN_API_VERSION);
ep->oid.len = l;
ep->oid.subtype = subtype;
ep->nr = nr;
ret = do_cmd(-IP_DUMMYNET3, ep, (uintptr_t)&l);
if (ret) {
free(ep);
errx(EX_DATAERR, "Error getting extra parameters\n");
}
switch (subtype) {
case DN_AQM_PARAMS:
if( !strcasecmp(ep->name, "codel")) {
us_to_time(ep->par[0], strt1);
us_to_time(ep->par[1], strt2);
l = sprintf(out, " AQM CoDel target %s interval %s",
strt1, strt2);
if (ep->par[2] & CODEL_ECN_ENABLED)
l = sprintf(out + l, " ECN");
else
l += sprintf(out + l, " NoECN");
} else if( !strcasecmp(ep->name, "pie")) {
us_to_time(ep->par[0], strt1);
us_to_time(ep->par[1], strt2);
us_to_time(ep->par[2], strt3);
l = sprintf(out, " AQM type PIE target %s tupdate %s alpha "
"%g beta %g max_burst %s max_ecnth %.3g",
strt1,
strt2,
ep->par[4] / (float) PIE_SCALE,
ep->par[5] / (float) PIE_SCALE,
strt3,
ep->par[3] / (float) PIE_SCALE
);
if (ep->par[6] & PIE_ECN_ENABLED)
l += sprintf(out + l, " ECN");
else
l += sprintf(out + l, " NoECN");
if (ep->par[6] & PIE_CAPDROP_ENABLED)
l += sprintf(out + l, " CapDrop");
else
l += sprintf(out + l, " NoCapDrop");
if (ep->par[6] & PIE_ON_OFF_MODE_ENABLED)
l += sprintf(out + l, " OnOff");
if (ep->par[6] & PIE_DEPRATEEST_ENABLED)
l += sprintf(out + l, " DRE");
else
l += sprintf(out + l, " TS");
if (ep->par[6] & PIE_DERAND_ENABLED)
l += sprintf(out + l, " Derand");
else
l += sprintf(out + l, " NoDerand");
}
break;
case DN_SCH_PARAMS:
if (!strcasecmp(ep->name,"FQ_CODEL")) {
us_to_time(ep->par[0], strt1);
us_to_time(ep->par[1], strt2);
l = sprintf(out," FQ_CODEL target %s interval %s"
" quantum %jd limit %jd flows %jd",
strt1, strt2,
(intmax_t) ep->par[3],
(intmax_t) ep->par[4],
(intmax_t) ep->par[5]
);
if (ep->par[2] & CODEL_ECN_ENABLED)
l += sprintf(out + l, " ECN");
else
l += sprintf(out + l, " NoECN");
l += sprintf(out + l, "\n");
} else if (!strcasecmp(ep->name,"FQ_PIE")) {
us_to_time(ep->par[0], strt1);
us_to_time(ep->par[1], strt2);
us_to_time(ep->par[2], strt3);
l = sprintf(out, " FQ_PIE target %s tupdate %s alpha "
"%g beta %g max_burst %s max_ecnth %.3g"
" quantum %jd limit %jd flows %jd",
strt1,
strt2,
ep->par[4] / (float) PIE_SCALE,
ep->par[5] / (float) PIE_SCALE,
strt3,
ep->par[3] / (float) PIE_SCALE,
(intmax_t) ep->par[7],
(intmax_t) ep->par[8],
(intmax_t) ep->par[9]
);
if (ep->par[6] & PIE_ECN_ENABLED)
l += sprintf(out + l, " ECN");
else
l += sprintf(out + l, " NoECN");
if (ep->par[6] & PIE_CAPDROP_ENABLED)
l += sprintf(out + l, " CapDrop");
else
l += sprintf(out + l, " NoCapDrop");
if (ep->par[6] & PIE_ON_OFF_MODE_ENABLED)
l += sprintf(out + l, " OnOff");
if (ep->par[6] & PIE_DEPRATEEST_ENABLED)
l += sprintf(out + l, " DRE");
else
l += sprintf(out + l, " TS");
if (ep->par[6] & PIE_DERAND_ENABLED)
l += sprintf(out + l, " Derand");
else
l += sprintf(out + l, " NoDerand");
l += sprintf(out + l, "\n");
}
break;
}
free(ep);
}
#endif
#if 0
static int
sort_q(void *arg, 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);
}
#endif
/* print a mask and header for the subsequent list of flows */
static void
print_mask(struct ipfw_flow_id *id)
{
if (!IS_IP6_FLOW_ID(id)) {
printf(" "
"mask: %s 0x%02x 0x%08x/0x%04x -> 0x%08x/0x%04x\n",
id->extra ? "queue," : "",
id->proto,
id->src_ip, id->src_port,
id->dst_ip, id->dst_port);
} else {
char buf[255];
printf("\n mask: %sproto: 0x%02x, flow_id: 0x%08x, ",
id->extra ? "queue," : "",
id->proto, id->flow_id6);
inet_ntop(AF_INET6_LINUX, &(id->src_ip6), buf, sizeof(buf));
printf("%s/0x%04x -> ", buf, id->src_port);
inet_ntop(AF_INET6_LINUX, &(id->dst_ip6), buf, sizeof(buf));
printf("%s/0x%04x\n", buf, id->dst_port);
}
}
static void
print_header(struct ipfw_flow_id *id)
{
if (!IS_IP6_FLOW_ID(id))
printf("BKT Prot ___Source IP/port____ "
"____Dest. IP/port____ "
"Tot_pkt/bytes Pkt/Byte Drp\n");
else
printf("BKT ___Prot___ _flow-id_ "
"______________Source IPv6/port_______________ "
"_______________Dest. IPv6/port_______________ "
"Tot_pkt/bytes Pkt/Byte Drp\n");
}
static void
list_flow(struct buf_pr *bp, struct dn_flow *ni)
{
char buff[255];
struct protoent *pe = NULL;
struct in_addr ina;
struct ipfw_flow_id *id = &ni->fid;
pe = getprotobynumber(id->proto);
/* XXX: Should check for IPv4 flows */
bprintf(bp, "%3u%c", (ni->oid.id) & 0xff,
id->extra ? '*' : ' ');
if (!IS_IP6_FLOW_ID(id)) {
if (pe)
bprintf(bp, "%-4s ", pe->p_name);
else
bprintf(bp, "%4u ", id->proto);
ina.s_addr = htonl(id->src_ip);
bprintf(bp, "%15s/%-5d ",
inet_ntoa(ina), id->src_port);
ina.s_addr = htonl(id->dst_ip);
bprintf(bp, "%15s/%-5d ",
inet_ntoa(ina), id->dst_port);
} else {
/* Print IPv6 flows */
if (pe != NULL)
bprintf(bp, "%9s ", pe->p_name);
else
bprintf(bp, "%9u ", id->proto);
bprintf(bp, "%7d %39s/%-5d ", id->flow_id6,
inet_ntop(AF_INET6_LINUX, &(id->src_ip6), buff, sizeof(buff)),
id->src_port);
bprintf(bp, " %39s/%-5d ",
inet_ntop(AF_INET6_LINUX, &(id->dst_ip6), buff, sizeof(buff)),
id->dst_port);
}
pr_u64(bp, &ni->tot_pkts, 4);
pr_u64(bp, &ni->tot_bytes, 8);
bprintf(bp, "%2u %4u %3u",
ni->length, ni->len_bytes, ni->drops);
}
static void
print_flowset_parms(struct dn_fs *fs, char *prefix)
{
int l;
char qs[30];
char plr[30];
char red[200]; /* Display RED parameters */
l = fs->qsize;
if (fs->flags & DN_QSIZE_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 & DN_IS_RED) { /* RED parameters */
sprintf(red,
"\n\t %cRED w_q %f min_th %d max_th %d max_p %f",
(fs->flags & DN_IS_GENTLE_RED) ? 'G' : ' ',
1.0 * fs->w_q / (double)(1 << SCALE_RED),
fs->min_th,
fs->max_th,
1.0 * fs->max_p / (double)(1 << SCALE_RED));
if (fs->flags & DN_IS_ECN)
strncat(red, " (ecn)", 6);
#ifdef NEW_AQM
/* get AQM parameters */
} else if (fs->flags & DN_IS_AQM) {
get_extra_parms(fs->fs_nr, red, DN_AQM_PARAMS);
#endif
} else
sprintf(red, "droptail");
if (prefix[0]) {
printf("%s %s%s %d queues (%d buckets) %s\n",
prefix, qs, plr, fs->oid.id, fs->buckets, red);
prefix[0] = '\0';
} else {
printf("q%05d %s%s %d flows (%d buckets) sched %d "
"weight %d lmax %d pri %d %s\n",
fs->fs_nr, qs, plr, fs->oid.id, fs->buckets,
fs->sched_nr, fs->par[0], fs->par[1], fs->par[2], red);
if (fs->flags & DN_HAVE_MASK)
print_mask(&fs->flow_mask);
}
}
static void
print_extra_delay_parms(struct dn_profile *p)
{
double loss;
if (p->samples_no <= 0)
return;
loss = p->loss_level;
loss /= p->samples_no;
printf("\t profile: name \"%s\" loss %f samples %d\n",
p->name, loss, p->samples_no);
}
static void
flush_buf(char *buf)
{
if (buf[0])
printf("%s\n", buf);
buf[0] = '\0';
}
/*
* generic list routine. We expect objects in a specific order, i.e.
* PIPES AND SCHEDULERS:
* link; scheduler; internal flowset if any; instances
* we can tell a pipe from the number.
*
* FLOWSETS:
* flowset; queues;
* link i (int queue); scheduler i; si(i) { flowsets() : queues }
*/
static void
list_pipes(struct dn_id *oid, struct dn_id *end)
{
char buf[160]; /* pending buffer */
int toPrint = 1; /* print header */
struct buf_pr bp;
buf[0] = '\0';
bp_alloc(&bp, 4096);
for (; oid != end; oid = O_NEXT(oid, oid->len)) {
if (oid->len < sizeof(*oid))
errx(1, "invalid oid len %d\n", oid->len);
switch (oid->type) {
default:
flush_buf(buf);
printf("unrecognized object %d size %d\n", oid->type, oid->len);
break;
case DN_TEXT: /* list of attached flowsets */
{
int i, l;
struct {
struct dn_id id;
uint32_t p[0];
} *d = (void *)oid;
l = (oid->len - sizeof(*oid))/sizeof(d->p[0]);
if (l == 0)
break;
printf(" Children flowsets: ");
for (i = 0; i < l; i++)
printf("%u ", d->p[i]);
printf("\n");
break;
}
case DN_CMD_GET:
if (co.verbose)
printf("answer for cmd %d, len %d\n", oid->type, oid->id);
break;
case DN_SCH: {
struct dn_sch *s = (struct dn_sch *)oid;
flush_buf(buf);
printf(" sched %d type %s flags 0x%x %d buckets %d active\n",
s->sched_nr,
s->name, s->flags, s->buckets, s->oid.id);
#ifdef NEW_AQM
char parms[200];
get_extra_parms(s->sched_nr, parms, DN_SCH_PARAMS);
printf("%s",parms);
#endif
if (s->flags & DN_HAVE_MASK)
print_mask(&s->sched_mask);
}
break;
case DN_FLOW:
if (toPrint != 0) {
print_header(&((struct dn_flow *)oid)->fid);
toPrint = 0;
}
list_flow(&bp, (struct dn_flow *)oid);
printf("%s\n", bp.buf);
bp_flush(&bp);
break;
case DN_LINK: {
struct dn_link *p = (struct dn_link *)oid;
double b = p->bandwidth;
char bwbuf[30];
char burst[5 + 7];
/* This starts a new object so flush buffer */
flush_buf(buf);
/* data rate */
if (b == 0)
sprintf(bwbuf, "unlimited ");
else if (b >= 1000000)
sprintf(bwbuf, "%7.3f Mbit/s", b/1000000);
else if (b >= 1000)
sprintf(bwbuf, "%7.3f Kbit/s", b/1000);
else
sprintf(bwbuf, "%7.3f bit/s ", b);
if (humanize_number(burst, sizeof(burst), p->burst,
"", HN_AUTOSCALE, 0) < 0 || co.verbose)
sprintf(burst, "%d", (int)p->burst);
sprintf(buf, "%05d: %s %4d ms burst %s",
p->link_nr % DN_MAX_ID, bwbuf, p->delay, burst);
}
break;
case DN_FS:
print_flowset_parms((struct dn_fs *)oid, buf);
break;
case DN_PROFILE:
flush_buf(buf);
print_extra_delay_parms((struct dn_profile *)oid);
}
flush_buf(buf); // XXX does it really go here ?
}
bp_free(&bp);
}
/*
* Delete pipe, queue or scheduler i
*/
int
ipfw_delete_pipe(int do_pipe, int i)
{
struct {
struct dn_id oid;
uintptr_t a[1]; /* add more if we want a list */
} cmd;
oid_fill((void *)&cmd, sizeof(cmd), DN_CMD_DELETE, DN_API_VERSION);
cmd.oid.subtype = (do_pipe == 1) ? DN_LINK :
( (do_pipe == 2) ? DN_FS : DN_SCH);
cmd.a[0] = i;
i = do_cmd(IP_DUMMYNET3, &cmd, cmd.oid.len);
if (i) {
i = 1;
warn("rule %u: setsockopt(IP_DUMMYNET_DEL)", i);
}
return i;
}
/*
* Code to parse delay profiles.
*
* Some link types introduce extra delays in the transmission
* of a packet, e.g. because of MAC level framing, contention on
* the use of the channel, MAC level retransmissions and so on.
* From our point of view, the channel is effectively unavailable
* for this extra time, which is constant or variable depending
* on the link type. Additionally, packets may be dropped after this
* time (e.g. on a wireless link after too many retransmissions).
* We can model the additional delay with an empirical curve
* that represents its distribution.
*
* cumulative probability
* 1.0 ^
* |
* L +-- loss-level x
* | ******
* | *
* | *****
* | *
* | **
* | *
* +-------*------------------->
* delay
*
* The empirical curve may have both vertical and horizontal lines.
* Vertical lines represent constant delay for a range of
* probabilities; horizontal lines correspond to a discontinuty
* in the delay distribution: the link will use the largest delay
* for a given probability.
*
* To pass the curve to dummynet, we must store the parameters
* in a file as described below, and issue the command
*
* ipfw pipe <n> config ... bw XXX profile <filename> ...
*
* The file format is the following, with whitespace acting as
* a separator and '#' indicating the beginning a comment:
*
* samples N
* the number of samples used in the internal
* representation (2..1024; default 100);
*
* loss-level L
* The probability above which packets are lost.
* (0.0 <= L <= 1.0, default 1.0 i.e. no loss);
*
* name identifier
* Optional a name (listed by "ipfw pipe show")
* to identify the distribution;
*
* "delay prob" | "prob delay"
* One of these two lines is mandatory and defines
* the format of the following lines with data points.
*
* XXX YYY
* 2 or more lines representing points in the curve,
* with either delay or probability first, according
* to the chosen format.
* The unit for delay is milliseconds.
*
* Data points does not need to be ordered or equal to the number
* specified in the "samples" line. ipfw will sort and interpolate
* the curve as needed.
*
* Example of a profile file:
name bla_bla_bla
samples 100
loss-level 0.86
prob delay
0 200 # minimum overhead is 200ms
0.5 200
0.5 300
0.8 1000
0.9 1300
1 1300
* Internally, we will convert the curve to a fixed number of
* samples, and when it is time to transmit a packet we will
* model the extra delay as extra bits in the packet.
*
*/
#define ED_MAX_LINE_LEN 256+ED_MAX_NAME_LEN
#define ED_TOK_SAMPLES "samples"
#define ED_TOK_LOSS "loss-level"
#define ED_TOK_NAME "name"
#define ED_TOK_DELAY "delay"
#define ED_TOK_PROB "prob"
#define ED_TOK_BW "bw"
#define ED_SEPARATORS " \t\n"
#define ED_MIN_SAMPLES_NO 2
/*
* returns 1 if s is a non-negative number, with at least one '.'
*/
static int
is_valid_number(const char *s)
{
int i, dots_found = 0;
int len = strlen(s);
for (i = 0; i<len; ++i)
if (!isdigit(s[i]) && (s[i] !='.' || ++dots_found > 1))
return 0;
return 1;
}
/*
* Take as input a string describing a bandwidth value
* and return the numeric bandwidth value.
* set clocking interface or bandwidth value
*/
static void
read_bandwidth(char *arg, int *bandwidth, char *if_name, int namelen)
{
if (*bandwidth != -1)
warnx("duplicate token, override bandwidth value!");
if (arg[0] >= 'a' && arg[0] <= 'z') {
if (!if_name) {
errx(1, "no if support");
}
if (namelen >= IFNAMSIZ)
warn("interface name truncated");
namelen--;
/* interface name */
strncpy(if_name, arg, namelen);
if_name[namelen] = '\0';
*bandwidth = 0;
} else { /* read bandwidth value */
int bw;
char *end = NULL;
bw = strtoul(arg, &end, 0);
if (*end == 'K' || *end == 'k') {
end++;
bw *= 1000;
} else if (*end == 'M' || *end == 'm') {
end++;
bw *= 1000000;
}
if ((*end == 'B' &&
_substrcmp2(end, "Bi", "Bit/s") != 0) ||
_substrcmp2(end, "by", "bytes") == 0)
bw *= 8;
if (bw < 0)
errx(EX_DATAERR, "bandwidth too large");
*bandwidth = bw;
if (if_name)
if_name[0] = '\0';
}
}
struct point {
double prob;
double delay;
};
static int
compare_points(const void *vp1, const void *vp2)
{
const struct point *p1 = vp1;
const struct point *p2 = vp2;
double res = 0;
res = p1->prob - p2->prob;
if (res == 0)
res = p1->delay - p2->delay;
if (res < 0)
return -1;
else if (res > 0)
return 1;
else
return 0;
}
#define ED_EFMT(s) EX_DATAERR,"error in %s at line %d: "#s,filename,lineno
static void
load_extra_delays(const char *filename, struct dn_profile *p,
struct dn_link *link)
{
char line[ED_MAX_LINE_LEN];
FILE *f;
int lineno = 0;
int i;
int samples = -1;
double loss = -1.0;
char profile_name[ED_MAX_NAME_LEN];
int delay_first = -1;
int do_points = 0;
struct point points[ED_MAX_SAMPLES_NO];
int points_no = 0;
/* XXX link never NULL? */
p->link_nr = link->link_nr;
profile_name[0] = '\0';
f = fopen(filename, "r");
if (f == NULL)
err(EX_UNAVAILABLE, "fopen: %s", filename);
while (fgets(line, ED_MAX_LINE_LEN, f)) { /* read commands */
char *s, *cur = line, *name = NULL, *arg = NULL;
++lineno;
/* parse the line */
while (cur) {
s = strsep(&cur, ED_SEPARATORS);
if (s == NULL || *s == '#')
break;
if (*s == '\0')
continue;
if (arg)
errx(ED_EFMT("too many arguments"));
if (name == NULL)
name = s;
else
arg = s;
}
if (name == NULL) /* empty line */
continue;
if (arg == NULL)
errx(ED_EFMT("missing arg for %s"), name);
if (!strcasecmp(name, ED_TOK_SAMPLES)) {
if (samples > 0)
errx(ED_EFMT("duplicate ``samples'' line"));
if (atoi(arg) <=0)
errx(ED_EFMT("invalid number of samples"));
samples = atoi(arg);
if (samples>ED_MAX_SAMPLES_NO)
errx(ED_EFMT("too many samples, maximum is %d"),
ED_MAX_SAMPLES_NO);
do_points = 0;
} else if (!strcasecmp(name, ED_TOK_BW)) {
char buf[IFNAMSIZ];
read_bandwidth(arg, &link->bandwidth, buf, sizeof(buf));
} else if (!strcasecmp(name, ED_TOK_LOSS)) {
if (loss != -1.0)
errx(ED_EFMT("duplicated token: %s"), name);
if (!is_valid_number(arg))
errx(ED_EFMT("invalid %s"), arg);
loss = atof(arg);
if (loss > 1)
errx(ED_EFMT("%s greater than 1.0"), name);
do_points = 0;
} else if (!strcasecmp(name, ED_TOK_NAME)) {
if (profile_name[0] != '\0')
errx(ED_EFMT("duplicated token: %s"), name);
strncpy(profile_name, arg, sizeof(profile_name) - 1);
profile_name[sizeof(profile_name)-1] = '\0';
do_points = 0;
} else if (!strcasecmp(name, ED_TOK_DELAY)) {
if (do_points)
errx(ED_EFMT("duplicated token: %s"), name);
delay_first = 1;
do_points = 1;
} else if (!strcasecmp(name, ED_TOK_PROB)) {
if (do_points)
errx(ED_EFMT("duplicated token: %s"), name);
delay_first = 0;
do_points = 1;
} else if (do_points) {
if (!is_valid_number(name) || !is_valid_number(arg))
errx(ED_EFMT("invalid point found"));
if (delay_first) {
points[points_no].delay = atof(name);
points[points_no].prob = atof(arg);
} else {
points[points_no].delay = atof(arg);
points[points_no].prob = atof(name);
}
if (points[points_no].prob > 1.0)
errx(ED_EFMT("probability greater than 1.0"));
++points_no;
} else {
errx(ED_EFMT("unrecognised command '%s'"), name);
}
}
fclose (f);
if (samples == -1) {
warnx("'%s' not found, assuming 100", ED_TOK_SAMPLES);
samples = 100;
}
if (loss == -1.0) {
warnx("'%s' not found, assuming no loss", ED_TOK_LOSS);
loss = 1;
}
/* make sure that there are enough points. */
if (points_no < ED_MIN_SAMPLES_NO)
errx(ED_EFMT("too few samples, need at least %d"),
ED_MIN_SAMPLES_NO);
qsort(points, points_no, sizeof(struct point), compare_points);
/* interpolation */
for (i = 0; i<points_no-1; ++i) {
double y1 = points[i].prob * samples;
double x1 = points[i].delay;
double y2 = points[i+1].prob * samples;
double x2 = points[i+1].delay;
int ix = y1;
int stop = y2;
if (x1 == x2) {
for (; ix<stop; ++ix)
p->samples[ix] = x1;
} else {
double m = (y2-y1)/(x2-x1);