sbin/ipfw/dummynet.c

   1 /*
   2  * Codel/FQ_Codel and PIE/FQ_PIE Code:
   3  * Copyright (C) 2016 Centre for Advanced Internet Architectures,
   4  *  Swinburne University of Technology, Melbourne, Australia.
   5  * Portions of this code were made possible in part by a gift from
   6  *  The Comcast Innovation Fund.
   7  * Implemented by Rasool Al-Saadi <ralsaadi@swin.edu.au>
   8  *
   9  * Copyright (c) 2002-2003,2010 Luigi Rizzo
  10  *
  11  * Redistribution and use in source forms, with and without modification,
  12  * are permitted provided that this entire comment appears intact.
  13  *
  14  * Redistribution in binary form may occur without any restrictions.
  15  * Obviously, it would be nice if you gave credit where credit is due
  16  * but requiring it would be too onerous.
  17  *
  18  * This software is provided ``AS IS'' without any warranties of any kind.
  19  *
  20  * $FreeBSD$
  21  *
  22  * dummynet support
  23  */
  24
  25 #define NEW_AQM
  26 #include <sys/types.h>
  27 #include <sys/socket.h>
  28 /* XXX there are several sysctl leftover here */
  29 #include <sys/sysctl.h>
  30
  31 #include "ipfw2.h"
  32
  33 #ifdef NEW_AQM
  34 #include <stdint.h>
  35 #endif
  36
  37 #include <ctype.h>
  38 #include <err.h>
  39 #include <errno.h>
  40 #include <libutil.h>
  41 #include <netdb.h>
  42 #include <stdio.h>
  43 #include <stdlib.h>
  44 #include <string.h>
  45 #include <sysexits.h>
  46
  47 #include <net/if.h>
  48 #include <netinet/in.h>
  49 #include <netinet/ip_fw.h>
  50 #include <netinet/ip_dummynet.h>
  51 #include <arpa/inet.h>  /* inet_ntoa */
  52
  53
  54 static struct _s_x dummynet_params[] = {
  55         { "plr",                TOK_PLR },
  56         { "noerror",            TOK_NOERROR },
  57         { "buckets",            TOK_BUCKETS },
  58         { "dst-ip",             TOK_DSTIP },
  59         { "src-ip",             TOK_SRCIP },
  60         { "dst-port",           TOK_DSTPORT },
  61         { "src-port",           TOK_SRCPORT },
  62         { "proto",              TOK_PROTO },
  63         { "weight",             TOK_WEIGHT },
  64         { "lmax",               TOK_LMAX },
  65         { "maxlen",             TOK_LMAX },
  66         { "all",                TOK_ALL },
  67         { "mask",               TOK_MASK }, /* alias for both */
  68         { "sched_mask",         TOK_SCHED_MASK },
  69         { "flow_mask",          TOK_FLOW_MASK },
  70         { "droptail",           TOK_DROPTAIL },
  71         { "ecn",                TOK_ECN },
  72         { "red",                TOK_RED },
  73         { "gred",               TOK_GRED },
  74 #ifdef NEW_AQM
  75         { "codel",              TOK_CODEL}, /* Codel AQM */
  76         { "fq_codel",   TOK_FQ_CODEL}, /* FQ-Codel  */
  77         { "pie",                TOK_PIE}, /* PIE AQM */
  78         { "fq_pie",             TOK_FQ_PIE}, /* FQ-PIE */
  79 #endif
  80         { "bw",                 TOK_BW },
  81         { "bandwidth",          TOK_BW },
  82         { "delay",              TOK_DELAY },
  83         { "link",               TOK_LINK },
  84         { "pipe",               TOK_PIPE },
  85         { "queue",              TOK_QUEUE },
  86         { "flowset",            TOK_FLOWSET },
  87         { "sched",              TOK_SCHED },
  88         { "pri",                TOK_PRI },
  89         { "priority",           TOK_PRI },
  90         { "type",               TOK_TYPE },
  91         { "flow-id",            TOK_FLOWID},
  92         { "dst-ipv6",           TOK_DSTIP6},
  93         { "dst-ip6",            TOK_DSTIP6},
  94         { "src-ipv6",           TOK_SRCIP6},
  95         { "src-ip6",            TOK_SRCIP6},
  96         { "profile",            TOK_PROFILE},
  97         { "burst",              TOK_BURST},
  98         { "dummynet-params",    TOK_NULL },
  99         { NULL, 0 }     /* terminator */
 100 };
 101
 102 #ifdef NEW_AQM
 103 /* AQM/extra sched parameters  tokens*/
 104 static struct _s_x aqm_params[] = {
 105         { "target",             TOK_TARGET},
 106         { "interval",           TOK_INTERVAL},
 107         { "limit",              TOK_LIMIT},
 108         { "flows",              TOK_FLOWS},
 109         { "quantum",            TOK_QUANTUM},
 110         { "ecn",                TOK_ECN},
 111         { "noecn",              TOK_NO_ECN},
 112         { "tupdate",            TOK_TUPDATE},
 113         { "max_burst",          TOK_MAX_BURST},
 114         { "max_ecnth",  TOK_MAX_ECNTH},
 115         { "alpha",              TOK_ALPHA},
 116         { "beta",               TOK_BETA},
 117         { "capdrop",    TOK_CAPDROP},
 118         { "nocapdrop",  TOK_NO_CAPDROP},
 119         { "onoff",      TOK_ONOFF},
 120         { "dre",        TOK_DRE},
 121         { "ts", TOK_TS},
 122         { "derand",     TOK_DERAND},
 123         { "noderand",   TOK_NO_DERAND},
 124         { NULL, 0 }     /* terminator */
 125 };
 126 #endif
 127
 128 #define O_NEXT(p, len) ((void *)((char *)p + len))
 129
 130 static void
 131 oid_fill(struct dn_id *oid, int len, int type, uintptr_t id)
 132 {
 133         oid->len = len;
 134         oid->type = type;
 135         oid->subtype = 0;
 136         oid->id = id;
 137 }
 138
 139 /* make room in the buffer and move the pointer forward */
 140 static void *
 141 o_next(struct dn_id **o, int len, int type)
 142 {
 143         struct dn_id *ret = *o;
 144         oid_fill(ret, len, type, 0);
 145         *o = O_NEXT(*o, len);
 146         return ret;
 147 }
 148
 149 #ifdef NEW_AQM
 150
 151 /* Codel flags */
 152 enum {
 153         CODEL_ECN_ENABLED = 1
 154 };
 155
 156 /* PIE flags, from PIE kernel module */
 157 enum {
 158         PIE_ECN_ENABLED = 1,
 159         PIE_CAPDROP_ENABLED = 2,
 160         PIE_ON_OFF_MODE_ENABLED = 4,
 161         PIE_DEPRATEEST_ENABLED = 8,
 162         PIE_DERAND_ENABLED = 16
 163 };
 164
 165 #define PIE_FIX_POINT_BITS 13
 166 #define PIE_SCALE (1L<<PIE_FIX_POINT_BITS)
 167
 168 /* integer to time */
 169 void
 170 us_to_time(int t,char *strt)
 171 {
 172         if (t < 0)
 173                 strt[0]='\0';
 174         else if ( t==0 )
 175                 sprintf(strt,"%d", t);
 176         else if (t< 1000)
 177                 sprintf(strt,"%dus", t);
 178         else if (t < 1000000)
 179                 sprintf(strt,"%gms", (float) t / 1000);
 180         else
 181                 sprintf(strt,"%gfs", (float) t / 1000000);
 182 }
 183
 184 /*
 185  * returns -1 if s is not a valid time, otherwise, return time in us
 186  */
 187 static long
 188 time_to_us(const char *s)
 189 {
 190         int i, dots = 0;
 191         int len = strlen(s);
 192         char strt[16]="", stru[16]="";
 193
 194         if (len>15)
 195                 return -1;
 196         for (i = 0; i<len && (isdigit(s[i]) || s[i]=='.') ; i++)
 197                 if (s[i]=='.') {
 198                         if (dots)
 199                                 return -1;
 200                         else
 201                                 dots++;
 202                 }
 203
 204         if (!i)
 205                 return -1;
 206         strncpy(strt, s, i);
 207         if (i<len)
 208                 strcpy(stru, s+i);
 209         else
 210                 strcpy(stru, "ms");
 211
 212         if (!strcasecmp(stru, "us"))
 213                 return atol(strt);
 214         if (!strcasecmp(stru, "ms"))
 215                 return (strtod(strt, NULL) * 1000);
 216         if (!strcasecmp(stru, "s"))
 217                 return (strtod(strt, NULL)*1000000);
 218
 219         return -1;
 220 }
 221
 222
 223 /* Get AQM or scheduler extra parameters  */
 224 void
 225 get_extra_parms(uint32_t nr, char *out, int subtype)
 226 {
 227         struct dn_extra_parms *ep;
 228         int ret;
 229         char strt1[15], strt2[15], strt3[15];
 230         u_int l;
 231
 232         /* prepare the request */
 233         l = sizeof(struct dn_extra_parms);
 234         ep = safe_calloc(1, l);
 235         memset(ep, 0, sizeof(*ep));
 236         *out = '\0';
 237
 238         oid_fill(&ep->oid, l, DN_CMD_GET, DN_API_VERSION);
 239         ep->oid.len = l;
 240         ep->oid.subtype = subtype;
 241         ep->nr = nr;
 242
 243         ret = do_cmd(-IP_DUMMYNET3, ep, (uintptr_t)&l);
 244         if (ret) {
 245                 free(ep);
 246                 errx(EX_DATAERR, "Error getting extra parameters\n");
 247         }
 248
 249         switch (subtype) {
 250         case DN_AQM_PARAMS:
 251                 if( !strcasecmp(ep->name, "codel")) {
 252                         us_to_time(ep->par[0], strt1);
 253                         us_to_time(ep->par[1], strt2);
 254                         l = sprintf(out, " AQM CoDel target %s interval %s",
 255                                 strt1, strt2);
 256                         if (ep->par[2] & CODEL_ECN_ENABLED)
 257                                 l = sprintf(out + l, " ECN");
 258                         else
 259                                 l += sprintf(out + l, " NoECN");
 260                 } else if( !strcasecmp(ep->name, "pie")) {
 261                         us_to_time(ep->par[0], strt1);
 262                         us_to_time(ep->par[1], strt2);
 263                         us_to_time(ep->par[2], strt3);
 264                         l = sprintf(out, " AQM type PIE target %s tupdate %s alpha "
 265                                         "%g beta %g max_burst %s max_ecnth %.3g",
 266                                         strt1,
 267                                         strt2,
 268                                         ep->par[4] / (float) PIE_SCALE,
 269                                         ep->par[5] / (float) PIE_SCALE,
 270                                         strt3,
 271                                         ep->par[3] / (float) PIE_SCALE
 272                                 );
 273
 274                         if (ep->par[6] & PIE_ECN_ENABLED)
 275                                 l += sprintf(out + l, " ECN");
 276                         else
 277                                 l += sprintf(out + l, " NoECN");
 278                         if (ep->par[6] & PIE_CAPDROP_ENABLED)
 279                                 l += sprintf(out + l, " CapDrop");
 280                         else
 281                                 l += sprintf(out + l, " NoCapDrop");
 282                         if (ep->par[6] & PIE_ON_OFF_MODE_ENABLED)
 283                                 l += sprintf(out + l, " OnOff");
 284                         if (ep->par[6] & PIE_DEPRATEEST_ENABLED)
 285                                 l += sprintf(out + l, " DRE");
 286                         else
 287                                 l += sprintf(out + l, " TS");
 288                         if (ep->par[6] & PIE_DERAND_ENABLED)
 289                                 l += sprintf(out + l, " Derand");
 290                         else
 291                                 l += sprintf(out + l, " NoDerand");
 292                 }
 293                 break;
 294
 295         case    DN_SCH_PARAMS:
 296                 if (!strcasecmp(ep->name,"FQ_CODEL")) {
 297                         us_to_time(ep->par[0], strt1);
 298                         us_to_time(ep->par[1], strt2);
 299                         l = sprintf(out," FQ_CODEL target %s interval %s"
 300                                 " quantum %jd limit %jd flows %jd",
 301                                 strt1, strt2,
 302                                 (intmax_t) ep->par[3],
 303                                 (intmax_t) ep->par[4],
 304                                 (intmax_t) ep->par[5]
 305                                 );
 306                         if (ep->par[2] & CODEL_ECN_ENABLED)
 307                                 l += sprintf(out + l, " ECN");
 308                         else
 309                                 l += sprintf(out + l, " NoECN");
 310                         l += sprintf(out + l, "\n");
 311                 } else  if (!strcasecmp(ep->name,"FQ_PIE")) {
 312                         us_to_time(ep->par[0], strt1);
 313                         us_to_time(ep->par[1], strt2);
 314                         us_to_time(ep->par[2], strt3);
 315                         l = sprintf(out, "  FQ_PIE target %s tupdate %s alpha "
 316                                 "%g beta %g max_burst %s max_ecnth %.3g"
 317                                 " quantum %jd limit %jd flows %jd",
 318                                 strt1,
 319                                 strt2,
 320                                 ep->par[4] / (float) PIE_SCALE,
 321                                 ep->par[5] / (float) PIE_SCALE,
 322                                 strt3,
 323                                 ep->par[3] / (float) PIE_SCALE,
 324                                 (intmax_t) ep->par[7],
 325                                 (intmax_t) ep->par[8],
 326                                 (intmax_t) ep->par[9]
 327                         );
 328
 329                         if (ep->par[6] & PIE_ECN_ENABLED)
 330                                 l += sprintf(out + l, " ECN");
 331                         else
 332                                 l += sprintf(out + l, " NoECN");
 333                         if (ep->par[6] & PIE_CAPDROP_ENABLED)
 334                                 l += sprintf(out + l, " CapDrop");
 335                         else
 336                                 l += sprintf(out + l, " NoCapDrop");
 337                         if (ep->par[6] & PIE_ON_OFF_MODE_ENABLED)
 338                                 l += sprintf(out + l, " OnOff");
 339                         if (ep->par[6] & PIE_DEPRATEEST_ENABLED)
 340                                 l += sprintf(out + l, " DRE");
 341                         else
 342                                 l += sprintf(out + l, " TS");
 343                         if (ep->par[6] & PIE_DERAND_ENABLED)
 344                                 l += sprintf(out + l, " Derand");
 345                         else
 346                                 l += sprintf(out + l, " NoDerand");
 347                         l += sprintf(out + l, "\n");
 348                 }
 349                 break;
 350         }
 351
 352         free(ep);
 353 }
 354 #endif
 355
 356
 357 #if 0
 358 static int
 359 sort_q(void *arg, const void *pa, const void *pb)
 360 {
 361         int rev = (co.do_sort < 0);
 362         int field = rev ? -co.do_sort : co.do_sort;
 363         long long res = 0;
 364         const struct dn_flow_queue *a = pa;
 365         const struct dn_flow_queue *b = pb;
 366
 367         switch (field) {
 368         case 1: /* pkts */
 369                 res = a->len - b->len;
 370                 break;
 371         case 2: /* bytes */
 372                 res = a->len_bytes - b->len_bytes;
 373                 break;
 374
 375         case 3: /* tot pkts */
 376                 res = a->tot_pkts - b->tot_pkts;
 377                 break;
 378
 379         case 4: /* tot bytes */
 380                 res = a->tot_bytes - b->tot_bytes;
 381                 break;
 382         }
 383         if (res < 0)
 384                 res = -1;
 385         if (res > 0)
 386                 res = 1;
 387         return (int)(rev ? res : -res);
 388 }
 389 #endif
 390
 391 /* print a mask and header for the subsequent list of flows */
 392 static void
 393 print_mask(struct ipfw_flow_id *id)
 394 {
 395         if (!IS_IP6_FLOW_ID(id)) {
 396                 printf("    "
 397                     "mask: %s 0x%02x 0x%08x/0x%04x -> 0x%08x/0x%04x\n",
 398                     id->extra ? "queue," : "",
 399                     id->proto,
 400                     id->src_ip, id->src_port,
 401                     id->dst_ip, id->dst_port);
 402         } else {
 403                 char buf[255];
 404                 printf("\n        mask: %sproto: 0x%02x, flow_id: 0x%08x,  ",
 405                     id->extra ? "queue," : "",
 406                     id->proto, id->flow_id6);
 407                 inet_ntop(AF_INET6, &(id->src_ip6), buf, sizeof(buf));
 408                 printf("%s/0x%04x -> ", buf, id->src_port);
 409                 inet_ntop(AF_INET6, &(id->dst_ip6), buf, sizeof(buf));
 410                 printf("%s/0x%04x\n", buf, id->dst_port);
 411         }
 412 }
 413
 414 static void
 415 print_header(struct ipfw_flow_id *id)
 416 {
 417         if (!IS_IP6_FLOW_ID(id))
 418                 printf("BKT Prot ___Source IP/port____ "
 419                     "____Dest. IP/port____ "
 420                     "Tot_pkt/bytes Pkt/Byte Drp\n");
 421         else
 422                 printf("BKT ___Prot___ _flow-id_ "
 423                     "______________Source IPv6/port_______________ "
 424                     "_______________Dest. IPv6/port_______________ "
 425                     "Tot_pkt/bytes Pkt/Byte Drp\n");
 426 }
 427
 428 static void
 429 list_flow(struct buf_pr *bp, struct dn_flow *ni)
 430 {
 431         char buff[255];
 432         struct protoent *pe = NULL;
 433         struct in_addr ina;
 434         struct ipfw_flow_id *id = &ni->fid;
 435
 436         pe = getprotobynumber(id->proto);
 437                 /* XXX: Should check for IPv4 flows */
 438         bprintf(bp, "%3u%c", (ni->oid.id) & 0xff,
 439                 id->extra ? '*' : ' ');
 440         if (!IS_IP6_FLOW_ID(id)) {
 441                 if (pe)
 442                         bprintf(bp, "%-4s ", pe->p_name);
 443                 else
 444                         bprintf(bp, "%4u ", id->proto);
 445                 ina.s_addr = htonl(id->src_ip);
 446                 bprintf(bp, "%15s/%-5d ",
 447                     inet_ntoa(ina), id->src_port);
 448                 ina.s_addr = htonl(id->dst_ip);
 449                 bprintf(bp, "%15s/%-5d ",
 450                     inet_ntoa(ina), id->dst_port);
 451         } else {
 452                 /* Print IPv6 flows */
 453                 if (pe != NULL)
 454                         bprintf(bp, "%9s ", pe->p_name);
 455                 else
 456                         bprintf(bp, "%9u ", id->proto);
 457                 bprintf(bp, "%7d  %39s/%-5d ", id->flow_id6,
 458                     inet_ntop(AF_INET6, &(id->src_ip6), buff, sizeof(buff)),
 459                     id->src_port);
 460                 bprintf(bp, " %39s/%-5d ",
 461                     inet_ntop(AF_INET6, &(id->dst_ip6), buff, sizeof(buff)),
 462                     id->dst_port);
 463         }
 464         pr_u64(bp, &ni->tot_pkts, 4);
 465         pr_u64(bp, &ni->tot_bytes, 8);
 466         bprintf(bp, "%2u %4u %3u",
 467             ni->length, ni->len_bytes, ni->drops);
 468 }
 469
 470 static void
 471 print_flowset_parms(struct dn_fs *fs, char *prefix)
 472 {
 473         int l;
 474         char qs[30];
 475         char plr[30];
 476         char red[200];  /* Display RED parameters */
 477
 478         l = fs->qsize;
 479         if (fs->flags & DN_QSIZE_BYTES) {
 480                 if (l >= 8192)
 481                         sprintf(qs, "%d KB", l / 1024);
 482                 else
 483                         sprintf(qs, "%d B", l);
 484         } else
 485                 sprintf(qs, "%3d sl.", l);
 486         if (fs->plr)
 487                 sprintf(plr, "plr %f", 1.0 * fs->plr / (double)(0x7fffffff));
 488         else
 489                 plr[0] = '\0';
 490
 491         if (fs->flags & DN_IS_RED) {    /* RED parameters */
 492                 sprintf(red,
 493                     "\n\t %cRED w_q %f min_th %d max_th %d max_p %f",
 494                     (fs->flags & DN_IS_GENTLE_RED) ? 'G' : ' ',
 495                     1.0 * fs->w_q / (double)(1 << SCALE_RED),
 496                     fs->min_th,
 497                     fs->max_th,
 498                     1.0 * fs->max_p / (double)(1 << SCALE_RED));
 499                 if (fs->flags & DN_IS_ECN)
 500                         strncat(red, " (ecn)", 6);
 501 #ifdef NEW_AQM
 502         /* get AQM parameters */
 503         } else if (fs->flags & DN_IS_AQM) {
 504                         get_extra_parms(fs->fs_nr, red, DN_AQM_PARAMS);
 505 #endif
 506         } else
 507                 sprintf(red, "droptail");
 508
 509         if (prefix[0]) {
 510             printf("%s %s%s %d queues (%d buckets) %s\n",
 511                 prefix, qs, plr, fs->oid.id, fs->buckets, red);
 512             prefix[0] = '\0';
 513         } else {
 514             printf("q%05d %s%s %d flows (%d buckets) sched %d "
 515                         "weight %d lmax %d pri %d %s\n",
 516                 fs->fs_nr, qs, plr, fs->oid.id, fs->buckets,
 517                 fs->sched_nr, fs->par[0], fs->par[1], fs->par[2], red);
 518             if (fs->flags & DN_HAVE_MASK)
 519                 print_mask(&fs->flow_mask);
 520         }
 521 }
 522
 523 static void
 524 print_extra_delay_parms(struct dn_profile *p)
 525 {
 526         double loss;
 527         if (p->samples_no <= 0)
 528                 return;
 529
 530         loss = p->loss_level;
 531         loss /= p->samples_no;
 532         printf("\t profile: name \"%s\" loss %f samples %d\n",
 533                 p->name, loss, p->samples_no);
 534 }
 535
 536 static void
 537 flush_buf(char *buf)
 538 {
 539         if (buf[0])
 540                 printf("%s\n", buf);
 541         buf[0] = '\0';
 542 }
 543
 544 /*
 545  * generic list routine. We expect objects in a specific order, i.e.
 546  * PIPES AND SCHEDULERS:
 547  *      link; scheduler; internal flowset if any; instances
 548  * we can tell a pipe from the number.
 549  *
 550  * FLOWSETS:
 551  *      flowset; queues;
 552  * link i (int queue); scheduler i; si(i) { flowsets() : queues }
 553  */
 554 static void
 555 list_pipes(struct dn_id *oid, struct dn_id *end)
 556 {
 557     char buf[160];      /* pending buffer */
 558     int toPrint = 1;    /* print header */
 559     struct buf_pr bp;
 560
 561     buf[0] = '\0';
 562     bp_alloc(&bp, 4096);
 563     for (; oid != end; oid = O_NEXT(oid, oid->len)) {
 564         if (oid->len < sizeof(*oid))
 565                 errx(1, "invalid oid len %d\n", oid->len);
 566
 567         switch (oid->type) {
 568         default:
 569             flush_buf(buf);
 570             printf("unrecognized object %d size %d\n", oid->type, oid->len);
 571             break;
 572         case DN_TEXT: /* list of attached flowsets */
 573             {
 574                 int i, l;
 575                 struct {
 576                         struct dn_id id;
 577                         uint32_t p[0];
 578                 } *d = (void *)oid;
 579                 l = (oid->len - sizeof(*oid))/sizeof(d->p[0]);
 580                 if (l == 0)
 581                     break;
 582                 printf("   Children flowsets: ");
 583                 for (i = 0; i < l; i++)
 584                         printf("%u ", d->p[i]);
 585                 printf("\n");
 586                 break;
 587             }
 588         case DN_CMD_GET:
 589             if (co.verbose)
 590                 printf("answer for cmd %d, len %d\n", oid->type, oid->id);
 591             break;
 592         case DN_SCH: {
 593             struct dn_sch *s = (struct dn_sch *)oid;
 594             flush_buf(buf);
 595             printf(" sched %d type %s flags 0x%x %d buckets %d active\n",
 596                         s->sched_nr,
 597                         s->name, s->flags, s->buckets, s->oid.id);
 598 #ifdef NEW_AQM
 599                 char parms[200];
 600                 get_extra_parms(s->sched_nr, parms, DN_SCH_PARAMS);
 601                 printf("%s",parms);
 602 #endif
 603             if (s->flags & DN_HAVE_MASK)
 604                 print_mask(&s->sched_mask);
 605             }
 606             break;
 607
 608         case DN_FLOW:
 609             if (toPrint != 0) {
 610                     print_header(&((struct dn_flow *)oid)->fid);
 611                     toPrint = 0;
 612             }
 613             list_flow(&bp, (struct dn_flow *)oid);
 614             printf("%s\n", bp.buf);
 615             bp_flush(&bp);
 616             break;
 617
 618         case DN_LINK: {
 619             struct dn_link *p = (struct dn_link *)oid;
 620             double b = p->bandwidth;
 621             char bwbuf[30];
 622             char burst[5 + 7];
 623
 624             /* This starts a new object so flush buffer */
 625             flush_buf(buf);
 626             /* data rate */
 627             if (b == 0)
 628                 sprintf(bwbuf, "unlimited     ");
 629             else if (b >= 1000000)
 630                 sprintf(bwbuf, "%7.3f Mbit/s", b/1000000);
 631             else if (b >= 1000)
 632                 sprintf(bwbuf, "%7.3f Kbit/s", b/1000);
 633             else
 634                 sprintf(bwbuf, "%7.3f bit/s ", b);
 635
 636             if (humanize_number(burst, sizeof(burst), p->burst,
 637                     "", HN_AUTOSCALE, 0) < 0 || co.verbose)
 638                 sprintf(burst, "%d", (int)p->burst);
 639             sprintf(buf, "%05d: %s %4d ms burst %s",
 640                 p->link_nr % DN_MAX_ID, bwbuf, p->delay, burst);
 641             }
 642             break;
 643
 644         case DN_FS:
 645             print_flowset_parms((struct dn_fs *)oid, buf);
 646             break;
 647         case DN_PROFILE:
 648             flush_buf(buf);
 649             print_extra_delay_parms((struct dn_profile *)oid);
 650         }
 651         flush_buf(buf); // XXX does it really go here ?
 652     }
 653
 654     bp_free(&bp);
 655 }
 656
 657 /*
 658  * Delete pipe, queue or scheduler i
 659  */
 660 int
 661 ipfw_delete_pipe(int do_pipe, int i)
 662 {
 663         struct {
 664                 struct dn_id oid;
 665                 uintptr_t a[1]; /* add more if we want a list */
 666         } cmd;
 667         oid_fill((void *)&cmd, sizeof(cmd), DN_CMD_DELETE, DN_API_VERSION);
 668         cmd.oid.subtype = (do_pipe == 1) ? DN_LINK :
 669                 ( (do_pipe == 2) ? DN_FS : DN_SCH);
 670         cmd.a[0] = i;
 671         i = do_cmd(IP_DUMMYNET3, &cmd, cmd.oid.len);
 672         if (i) {
 673                 i = 1;
 674                 warn("rule %u: setsockopt(IP_DUMMYNET_DEL)", i);
 675         }
 676         return i;
 677 }
 678
 679 /*
 680  * Code to parse delay profiles.
 681  *
 682  * Some link types introduce extra delays in the transmission
 683  * of a packet, e.g. because of MAC level framing, contention on
 684  * the use of the channel, MAC level retransmissions and so on.
 685  * From our point of view, the channel is effectively unavailable
 686  * for this extra time, which is constant or variable depending
 687  * on the link type. Additionally, packets may be dropped after this
 688  * time (e.g. on a wireless link after too many retransmissions).
 689  * We can model the additional delay with an empirical curve
 690  * that represents its distribution.
 691  *
 692  *      cumulative probability
 693  *      1.0 ^
 694  *          |
 695  *      L   +-- loss-level          x
 696  *          |                 ******
 697  *          |                *
 698  *          |           *****
 699  *          |          *
 700  *          |        **
 701  *          |       *
 702  *          +-------*------------------->
 703  *                      delay
 704  *
 705  * The empirical curve may have both vertical and horizontal lines.
 706  * Vertical lines represent constant delay for a range of
 707  * probabilities; horizontal lines correspond to a discontinuty
 708  * in the delay distribution: the link will use the largest delay
 709  * for a given probability.
 710  *
 711  * To pass the curve to dummynet, we must store the parameters
 712  * in a file as described below, and issue the command
 713  *
 714  *      ipfw pipe <n> config ... bw XXX profile <filename> ...
 715  *
 716  * The file format is the following, with whitespace acting as
 717  * a separator and '#' indicating the beginning a comment:
 718  *
 719  *      samples N
 720  *              the number of samples used in the internal
 721  *              representation (2..1024; default 100);
 722  *
 723  *      loss-level L
 724  *              The probability above which packets are lost.
 725  *             (0.0 <= L <= 1.0, default 1.0 i.e. no loss);
 726  *
 727  *      name identifier
 728  *              Optional a name (listed by "ipfw pipe show")
 729  *              to identify the distribution;
 730  *
 731  *      "delay prob" | "prob delay"
 732  *              One of these two lines is mandatory and defines
 733  *              the format of the following lines with data points.
 734  *
 735  *      XXX YYY
 736  *              2 or more lines representing points in the curve,
 737  *              with either delay or probability first, according
 738  *              to the chosen format.
 739  *              The unit for delay is milliseconds.
 740  *
 741  * Data points does not need to be ordered or equal to the number
 742  * specified in the "samples" line. ipfw will sort and interpolate
 743  * the curve as needed.
 744  *
 745  * Example of a profile file:
 746
 747         name    bla_bla_bla
 748         samples 100
 749         loss-level    0.86
 750         prob    delay
 751         0       200     # minimum overhead is 200ms
 752         0.5     200
 753         0.5     300
 754         0.8     1000
 755         0.9     1300
 756         1       1300
 757
 758  * Internally, we will convert the curve to a fixed number of
 759  * samples, and when it is time to transmit a packet we will
 760  * model the extra delay as extra bits in the packet.
 761  *
 762  */
 763
 764 #define ED_MAX_LINE_LEN 256+ED_MAX_NAME_LEN
 765 #define ED_TOK_SAMPLES  "samples"
 766 #define ED_TOK_LOSS     "loss-level"
 767 #define ED_TOK_NAME     "name"
 768 #define ED_TOK_DELAY    "delay"
 769 #define ED_TOK_PROB     "prob"
 770 #define ED_TOK_BW       "bw"
 771 #define ED_SEPARATORS   " \t\n"
 772 #define ED_MIN_SAMPLES_NO       2
 773
 774 /*
 775  * returns 1 if s is a non-negative number, with at least one '.'
 776  */
 777 static int
 778 is_valid_number(const char *s)
 779 {
 780         int i, dots_found = 0;
 781         int len = strlen(s);
 782
 783         for (i = 0; i<len; ++i)
 784                 if (!isdigit(s[i]) && (s[i] !='.' || ++dots_found > 1))
 785                         return 0;
 786         return 1;
 787 }
 788
 789 /*
 790  * Take as input a string describing a bandwidth value
 791  * and return the numeric bandwidth value.
 792  * set clocking interface or bandwidth value
 793  */
 794 static void
 795 read_bandwidth(char *arg, int *bandwidth, char *if_name, int namelen)
 796 {
 797         if (*bandwidth != -1)
 798                 warnx("duplicate token, override bandwidth value!");
 799
 800         if (arg[0] >= 'a' && arg[0] <= 'z') {
 801                 if (!if_name) {
 802                         errx(1, "no if support");
 803                 }
 804                 if (namelen >= IFNAMSIZ)
 805                         warn("interface name truncated");
 806                 namelen--;
 807                 /* interface name */
 808                 strlcpy(if_name, arg, namelen);
 809                 *bandwidth = 0;
 810         } else {        /* read bandwidth value */
 811                 int bw;
 812                 char *end = NULL;
 813
 814                 bw = strtoul(arg, &end, 0);
 815                 if (*end == 'K' || *end == 'k') {
 816                         end++;
 817                         bw *= 1000;
 818                 } else if (*end == 'M' || *end == 'm') {
 819                         end++;
 820                         bw *= 1000000;
 821                 }
 822                 if ((*end == 'B' &&
 823                         _substrcmp2(end, "Bi", "Bit/s") != 0) ||
 824                     _substrcmp2(end, "by", "bytes") == 0)
 825                         bw *= 8;
 826
 827                 if (bw < 0)
 828                         errx(EX_DATAERR, "bandwidth too large");
 829
 830                 *bandwidth = bw;
 831                 if (if_name)
 832                         if_name[0] = '\0';
 833         }
 834 }
 835
 836 struct point {
 837         double prob;
 838         double delay;
 839 };
 840
 841 static int
 842 compare_points(const void *vp1, const void *vp2)
 843 {
 844         const struct point *p1 = vp1;
 845         const struct point *p2 = vp2;
 846         double res = 0;
 847
 848         res = p1->prob - p2->prob;
 849         if (res == 0)
 850                 res = p1->delay - p2->delay;
 851         if (res < 0)
 852                 return -1;
 853         else if (res > 0)
 854                 return 1;
 855         else
 856                 return 0;
 857 }
 858
 859 #define ED_EFMT(s) EX_DATAERR,"error in %s at line %d: "#s,filename,lineno
 860
 861 static void
 862 load_extra_delays(const char *filename, struct dn_profile *p,
 863         struct dn_link *link)
 864 {
 865         char    line[ED_MAX_LINE_LEN];
 866         FILE    *f;
 867         int     lineno = 0;
 868         int     i;
 869
 870         int     samples = -1;
 871         double  loss = -1.0;
 872         char    profile_name[ED_MAX_NAME_LEN];
 873         int     delay_first = -1;
 874         int     do_points = 0;
 875         struct point    points[ED_MAX_SAMPLES_NO];
 876         int     points_no = 0;
 877
 878         /* XXX link never NULL? */
 879         p->link_nr = link->link_nr;
 880
 881         profile_name[0] = '\0';
 882         f = fopen(filename, "r");
 883         if (f == NULL)
 884                 err(EX_UNAVAILABLE, "fopen: %s", filename);
 885
 886         while (fgets(line, ED_MAX_LINE_LEN, f)) {        /* read commands */
 887                 char *s, *cur = line, *name = NULL, *arg = NULL;
 888
 889                 ++lineno;
 890
 891                 /* parse the line */
 892                 while (cur) {
 893                         s = strsep(&cur, ED_SEPARATORS);
 894                         if (s == NULL || *s == '#')
 895                                 break;
 896                         if (*s == '\0')
 897                                 continue;
 898                         if (arg)
 899                                 errx(ED_EFMT("too many arguments"));
 900                         if (name == NULL)
 901                                 name = s;
 902                         else
 903                                 arg = s;
 904                 }
 905                 if (name == NULL)       /* empty line */
 906                         continue;
 907                 if (arg == NULL)
 908                         errx(ED_EFMT("missing arg for %s"), name);
 909
 910                 if (!strcasecmp(name, ED_TOK_SAMPLES)) {
 911                     if (samples > 0)
 912                         errx(ED_EFMT("duplicate ``samples'' line"));
 913                     if (atoi(arg) <=0)
 914                         errx(ED_EFMT("invalid number of samples"));
 915                     samples = atoi(arg);
 916                     if (samples>ED_MAX_SAMPLES_NO)
 917                             errx(ED_EFMT("too many samples, maximum is %d"),
 918                                 ED_MAX_SAMPLES_NO);
 919                     do_points = 0;
 920                 } else if (!strcasecmp(name, ED_TOK_BW)) {
 921                     char buf[IFNAMSIZ];
 922                     read_bandwidth(arg, &link->bandwidth, buf, sizeof(buf));
 923                 } else if (!strcasecmp(name, ED_TOK_LOSS)) {
 924                     if (loss != -1.0)
 925                         errx(ED_EFMT("duplicated token: %s"), name);
 926                     if (!is_valid_number(arg))
 927                         errx(ED_EFMT("invalid %s"), arg);
 928                     loss = atof(arg);
 929                     if (loss > 1)
 930                         errx(ED_EFMT("%s greater than 1.0"), name);
 931                     do_points = 0;
 932                 } else if (!strcasecmp(name, ED_TOK_NAME)) {
 933                     if (profile_name[0] != '\0')
 934                         errx(ED_EFMT("duplicated token: %s"), name);
 935                     strlcpy(profile_name, arg, sizeof(profile_name));
 936                     do_points = 0;
 937                 } else if (!strcasecmp(name, ED_TOK_DELAY)) {
 938                     if (do_points)
 939                         errx(ED_EFMT("duplicated token: %s"), name);
 940                     delay_first = 1;
 941                     do_points = 1;
 942                 } else if (!strcasecmp(name, ED_TOK_PROB)) {
 943                     if (do_points)
 944                         errx(ED_EFMT("duplicated token: %s"), name);
 945                     delay_first = 0;
 946                     do_points = 1;
 947                 } else if (do_points) {
 948                     if (!is_valid_number(name) || !is_valid_number(arg))
 949                         errx(ED_EFMT("invalid point found"));
 950                     if (delay_first) {
 951                         points[points_no].delay = atof(name);
 952                         points[points_no].prob = atof(arg);
 953                     } else {
 954                         points[points_no].delay = atof(arg);
 955                         points[points_no].prob = atof(name);
 956                     }
 957                     if (points[points_no].prob > 1.0)
 958                         errx(ED_EFMT("probability greater than 1.0"));
 959                     ++points_no;
 960                 } else {
 961                     errx(ED_EFMT("unrecognised command '%s'"), name);
 962                 }
 963         }
 964
 965         fclose (f);
 966
 967         if (samples == -1) {
 968             warnx("'%s' not found, assuming 100", ED_TOK_SAMPLES);
 969             samples = 100;
 970         }
 971
 972         if (loss == -1.0) {
 973             warnx("'%s' not found, assuming no loss", ED_TOK_LOSS);
 974             loss = 1;
 975         }
 976
 977         /* make sure that there are enough points. */
 978         if (points_no < ED_MIN_SAMPLES_NO)
 979             errx(ED_EFMT("too few samples, need at least %d"),
 980                 ED_MIN_SAMPLES_NO);
 981
 982         qsort(points, points_no, sizeof(struct point), compare_points);
 983
 984         /* interpolation */
 985         for (i = 0; i<points_no-1; ++i) {
 986             double y1 = points[i].prob * samples;
 987             double x1 = points[i].delay;
 988             double y2 = points[i+1].prob * samples;
 989             double x2 = points[i+1].delay;
 990
 991             int ix = y1;
 992             int stop = y2;
 993
 994             if (x1 == x2) {
 995                 for (; ix<stop; ++ix)
 996                     p->samples[ix] = x1;
 997             } else {
 998                 double m = (y2-y1)/(x2-x1);
 999                 double c = y1 - m*x1;
1000                 for (; ix<stop ; ++ix)
1001                     p->samples[ix] = (ix - c)/m;
1002             }
1003         }
1004         p->samples_no = samples;
1005         p->loss_level = loss * samples;
1006         strlcpy(p->name, profile_name, sizeof(p->name));
1007 }
1008
1009 #ifdef NEW_AQM
1010
1011 /* Parse AQM/extra scheduler parameters */
1012 static int
1013 process_extra_parms(int *ac, char **av, struct dn_extra_parms *ep,
1014         uint16_t type)
1015 {
1016         int i;
1017
1018         /* use kernel defaults */
1019         for (i=0; i<DN_MAX_EXTRA_PARM; i++)
1020                 ep->par[i] = -1;
1021
1022         switch(type) {
1023         case TOK_CODEL:
1024         case TOK_FQ_CODEL:
1025         /* Codel
1026          * 0- target, 1- interval, 2- flags,
1027          * FQ_CODEL
1028          * 3- quantum, 4- limit, 5- flows
1029          */
1030                 if (type==TOK_CODEL)
1031                         ep->par[2] = 0;
1032                 else
1033                         ep->par[2] = CODEL_ECN_ENABLED;
1034
1035                 while (*ac > 0) {
1036                         int tok = match_token(aqm_params, *av);
1037                         (*ac)--; av++;
1038                         switch(tok) {
1039                         case TOK_TARGET:
1040                                 if (*ac <= 0 || time_to_us(av[0]) < 0)
1041                                         errx(EX_DATAERR, "target needs time\n");
1042
1043                                 ep->par[0] = time_to_us(av[0]);
1044                                 (*ac)--; av++;
1045                                 break;
1046
1047                         case TOK_INTERVAL:
1048                                 if (*ac <= 0 || time_to_us(av[0]) < 0)
1049                                         errx(EX_DATAERR, "interval needs time\n");
1050
1051                                 ep->par[1] = time_to_us(av[0]);
1052                                 (*ac)--; av++;
1053                                 break;
1054
1055                         case TOK_ECN:
1056                                 ep->par[2] = CODEL_ECN_ENABLED;
1057                                 break;
1058                         case TOK_NO_ECN:
1059                                 ep->par[2] &= ~CODEL_ECN_ENABLED;
1060                                 break;
1061                         /* Config fq_codel parameters */
1062                         case TOK_QUANTUM:
1063                                 if (type != TOK_FQ_CODEL)
1064                                         errx(EX_DATAERR, "quantum is not for codel\n");
1065                                 if (*ac <= 0 || !is_valid_number(av[0]))
1066                                         errx(EX_DATAERR, "quantum needs number\n");
1067
1068                                 ep->par[3]= atoi(av[0]);
1069                                 (*ac)--; av++;
1070                                 break;
1071
1072                         case TOK_LIMIT:
1073                                 if (type != TOK_FQ_CODEL)
1074                                         errx(EX_DATAERR, "limit is not for codel, use queue instead\n");
1075                                 if (*ac <= 0 || !is_valid_number(av[0]))
1076                                         errx(EX_DATAERR, "limit needs number\n");
1077
1078                                 ep->par[4] = atoi(av[0]);
1079                                 (*ac)--; av++;
1080                                 break;
1081
1082                         case TOK_FLOWS:
1083                                 if (type != TOK_FQ_CODEL)
1084                                         errx(EX_DATAERR, "flows is not for codel\n");
1085                                 if (*ac <= 0 || !is_valid_number(av[0]))
1086                                         errx(EX_DATAERR, "flows needs number\n");
1087
1088                                 ep->par[5] = atoi(av[0]);
1089                                 (*ac)--; av++;
1090                                 break;
1091
1092                         default:
1093                                 printf("%s is Invalid parameter\n", av[-1]);
1094                         }
1095                 }
1096                 break;
1097         case TOK_PIE:
1098         case TOK_FQ_PIE:
1099                 /* PIE
1100                  * 0- target , 1- tupdate, 2- max_burst,
1101                  * 3- max_ecnth, 4- alpha,
1102                  * 5- beta, 6- flags
1103                  * FQ_CODEL
1104                  * 7- quantum, 8- limit, 9- flows
1105                  */
1106
1107                 if ( type == TOK_PIE)
1108                         ep->par[6] = PIE_CAPDROP_ENABLED | PIE_DEPRATEEST_ENABLED
1109                                 | PIE_DERAND_ENABLED;
1110                 else
1111                         /* for FQ-PIE, use TS mode */
1112                         ep->par[6] = PIE_CAPDROP_ENABLED |  PIE_DERAND_ENABLED
1113                                 | PIE_ECN_ENABLED;
1114
1115                 while (*ac > 0) {
1116                         int tok = match_token(aqm_params, *av);
1117                         (*ac)--; av++;
1118                         switch(tok) {
1119                         case TOK_TARGET:
1120                                 if (*ac <= 0 || time_to_us(av[0]) < 0)
1121                                         errx(EX_DATAERR, "target needs time\n");
1122
1123                                 ep->par[0] = time_to_us(av[0]);
1124                                 (*ac)--; av++;
1125                                 break;
1126
1127                         case TOK_TUPDATE:
1128                                 if (*ac <= 0 || time_to_us(av[0]) < 0)
1129                                         errx(EX_DATAERR, "tupdate needs time\n");
1130
1131                                 ep->par[1] = time_to_us(av[0]);
1132                                 (*ac)--; av++;
1133                                 break;
1134
1135                         case TOK_MAX_BURST:
1136                                 if (*ac <= 0 || time_to_us(av[0]) < 0)
1137                                         errx(EX_DATAERR, "max_burst needs time\n");
1138
1139                                 ep->par[2] = time_to_us(av[0]);
1140                                 (*ac)--; av++;
1141                                 break;
1142
1143                         case TOK_MAX_ECNTH:
1144                                 if (*ac <= 0 || !is_valid_number(av[0]))
1145                                         errx(EX_DATAERR, "max_ecnth needs number\n");
1146
1147                                 ep->par[3] = atof(av[0]) * PIE_SCALE;
1148                                 (*ac)--; av++;
1149                                 break;
1150
1151                         case TOK_ALPHA:
1152                                 if (*ac <= 0 || !is_valid_number(av[0]))
1153                                         errx(EX_DATAERR, "alpha needs number\n");
1154
1155                                 ep->par[4] = atof(av[0]) * PIE_SCALE;
1156                                 (*ac)--; av++;
1157                                 break;
1158
1159                         case TOK_BETA:
1160                                 if (*ac <= 0 || !is_valid_number(av[0]))
1161                                         errx(EX_DATAERR, "beta needs number\n");
1162
1163                                 ep->par[5] = atof(av[0]) * PIE_SCALE;
1164                                 (*ac)--; av++;
1165                                 break;
1166
1167                         case TOK_ECN:
1168                                 ep->par[6] |= PIE_ECN_ENABLED;
1169                                 break;
1170                         case TOK_NO_ECN:
1171                                 ep->par[6] &= ~PIE_ECN_ENABLED;
1172                                 break;
1173
1174                         case TOK_CAPDROP:
1175                                 ep->par[6] |= PIE_CAPDROP_ENABLED;
1176                                 break;
1177                         case TOK_NO_CAPDROP:
1178                                 ep->par[6] &= ~PIE_CAPDROP_ENABLED;
1179                                 break;
1180
1181                         case TOK_ONOFF:
1182                                 ep->par[6] |= PIE_ON_OFF_MODE_ENABLED;
1183                                 break;
1184
1185                         case TOK_DRE:
1186                                 ep->par[6] |= PIE_DEPRATEEST_ENABLED;
1187                                 break;
1188
1189                         case TOK_TS:
1190                                 ep->par[6] &= ~PIE_DEPRATEEST_ENABLED;
1191                                 break;
1192
1193                         case TOK_DERAND:
1194                                 ep->par[6] |= PIE_DERAND_ENABLED;
1195                                 break;
1196                         case TOK_NO_DERAND:
1197                                 ep->par[6] &= ~PIE_DERAND_ENABLED;
1198                                 break;
1199
1200                         /* Config fq_pie parameters */
1201                         case TOK_QUANTUM:
1202                                 if (type != TOK_FQ_PIE)
1203                                         errx(EX_DATAERR, "quantum is not for pie\n");
1204                                 if (*ac <= 0 || !is_valid_number(av[0]))
1205                                         errx(EX_DATAERR, "quantum needs number\n");
1206
1207                                 ep->par[7]= atoi(av[0]);
1208                                 (*ac)--; av++;
1209                                 break;
1210
1211                         case TOK_LIMIT:
1212                                 if (type != TOK_FQ_PIE)
1213                                         errx(EX_DATAERR, "limit is not for pie, use queue instead\n");
1214                                 if (*ac <= 0 || !is_valid_number(av[0]))
1215                                         errx(EX_DATAERR, "limit needs number\n");
1216
1217                                 ep->par[8] = atoi(av[0]);
1218                                 (*ac)--; av++;
1219                                 break;
1220
1221                         case TOK_FLOWS:
1222                                 if (type != TOK_FQ_PIE)
1223                                         errx(EX_DATAERR, "flows is not for pie\n");
1224                                 if (*ac <= 0 || !is_valid_number(av[0]))
1225                                         errx(EX_DATAERR, "flows needs number\n");
1226
1227                                 ep->par[9] = atoi(av[0]);
1228                                 (*ac)--; av++;
1229                                 break;
1230
1231
1232                         default:
1233                                 printf("%s is invalid parameter\n", av[-1]);
1234                         }
1235                 }
1236                 break;
1237         }
1238
1239         return 0;
1240 }
1241
1242 #endif
1243
1244
1245 /*
1246  * configuration of pipes, schedulers, flowsets.
1247  * When we configure a new scheduler, an empty pipe is created, so:
1248  *
1249  * do_pipe = 1 -> "pipe N config ..." only for backward compatibility
1250  *      sched N+Delta type fifo sched_mask ...
1251  *      pipe N+Delta <parameters>
1252  *      flowset N+Delta pipe N+Delta (no parameters)
1253  *      sched N type wf2q+ sched_mask ...
1254  *      pipe N <parameters>
1255  *
1256  * do_pipe = 2 -> flowset N config
1257  *      flowset N parameters
1258  *
1259  * do_pipe = 3 -> sched N config
1260  *      sched N parameters (default no pipe)
1261  *      optional Pipe N config ...
1262  * pipe ==>
1263  */
1264 void
1265 ipfw_config_pipe(int ac, char **av)
1266 {
1267         int i;
1268         u_int j;
1269         char *end;
1270         struct dn_id *buf, *base;
1271         struct dn_sch *sch = NULL;
1272         struct dn_link *p = NULL;
1273         struct dn_fs *fs = NULL;
1274         struct dn_profile *pf = NULL;
1275         struct ipfw_flow_id *mask = NULL;
1276 #ifdef NEW_AQM
1277         struct dn_extra_parms *aqm_extra;
1278         struct dn_extra_parms *sch_extra;
1279         int lmax_extra;
1280 #endif
1281
1282         int lmax;
1283         uint32_t _foo = 0, *flags = &_foo , *buckets = &_foo;
1284
1285         /*
1286          * allocate space for 1 header,
1287          * 1 scheduler, 1 link, 1 flowset, 1 profile
1288          */
1289         lmax = sizeof(struct dn_id);    /* command header */
1290         lmax += sizeof(struct dn_sch) + sizeof(struct dn_link) +
1291                 sizeof(struct dn_fs) + sizeof(struct dn_profile);
1292
1293 #ifdef NEW_AQM
1294         /* Extra Params */
1295         lmax_extra = sizeof(struct dn_extra_parms);
1296         /* two lmax_extra because one for AQM params and another
1297          * sch params
1298          */
1299         lmax += lmax_extra*2;
1300 #endif
1301
1302         av++; ac--;
1303         /* Pipe number */
1304         if (ac && isdigit(**av)) {
1305                 i = atoi(*av); av++; ac--;
1306         } else
1307                 i = -1;
1308         if (i <= 0)
1309                 errx(EX_USAGE, "need a pipe/flowset/sched number");
1310         base = buf = safe_calloc(1, lmax);
1311         /* all commands start with a 'CONFIGURE' and a version */
1312         o_next(&buf, sizeof(struct dn_id), DN_CMD_CONFIG);
1313         base->id = DN_API_VERSION;
1314
1315         switch (co.do_pipe) {
1316         case 1: /* "pipe N config ..." */
1317                 /* Allocate space for the WF2Q+ scheduler, its link
1318                  * and the FIFO flowset. Set the number, but leave
1319                  * the scheduler subtype and other parameters to 0
1320                  * so the kernel will use appropriate defaults.
1321                  * XXX todo: add a flag to record if a parameter
1322                  * is actually configured.
1323                  * If we do a 'pipe config' mask -> sched_mask.
1324                  * The FIFO scheduler and link are derived from the
1325                  * WF2Q+ one in the kernel.
1326                  */
1327 #ifdef NEW_AQM
1328                 sch_extra = o_next(&buf, lmax_extra, DN_TEXT);
1329                 sch_extra ->oid.subtype = 0; /* don't configure scheduler */
1330 #endif
1331                 sch = o_next(&buf, sizeof(*sch), DN_SCH);
1332                 p = o_next(&buf, sizeof(*p), DN_LINK);
1333 #ifdef NEW_AQM
1334                 aqm_extra = o_next(&buf, lmax_extra, DN_TEXT);
1335                 aqm_extra ->oid.subtype = 0; /* don't configure AQM */
1336 #endif
1337                 fs = o_next(&buf, sizeof(*fs), DN_FS);
1338
1339                 sch->sched_nr = i;
1340                 sch->oid.subtype = 0;   /* defaults to WF2Q+ */
1341                 mask = &sch->sched_mask;
1342                 flags = &sch->flags;
1343                 buckets = &sch->buckets;
1344                 *flags |= DN_PIPE_CMD;
1345
1346                 p->link_nr = i;
1347
1348                 /* This flowset is only for the FIFO scheduler */
1349                 fs->fs_nr = i + 2*DN_MAX_ID;
1350                 fs->sched_nr = i + DN_MAX_ID;
1351                 break;
1352
1353         case 2: /* "queue N config ... " */
1354 #ifdef NEW_AQM
1355                 aqm_extra = o_next(&buf, lmax_extra, DN_TEXT);
1356                 aqm_extra ->oid.subtype = 0;
1357 #endif
1358                 fs = o_next(&buf, sizeof(*fs), DN_FS);
1359                 fs->fs_nr = i;
1360                 mask = &fs->flow_mask;
1361                 flags = &fs->flags;
1362                 buckets = &fs->buckets;
1363                 break;
1364
1365         case 3: /* "sched N config ..." */
1366 #ifdef NEW_AQM
1367                 sch_extra = o_next(&buf, lmax_extra, DN_TEXT);
1368                 sch_extra ->oid.subtype = 0;
1369 #endif
1370                 sch = o_next(&buf, sizeof(*sch), DN_SCH);
1371 #ifdef NEW_AQM
1372                 aqm_extra = o_next(&buf, lmax_extra, DN_TEXT);
1373                 aqm_extra ->oid.subtype = 0;
1374 #endif
1375                 fs = o_next(&buf, sizeof(*fs), DN_FS);
1376                 sch->sched_nr = i;
1377                 mask = &sch->sched_mask;
1378                 flags = &sch->flags;
1379                 buckets = &sch->buckets;
1380                 /* fs is used only with !MULTIQUEUE schedulers */
1381                 fs->fs_nr = i + DN_MAX_ID;
1382                 fs->sched_nr = i;
1383                 break;
1384         }
1385         /* set to -1 those fields for which we want to reuse existing
1386          * values from the kernel.
1387          * Also, *_nr and subtype = 0 mean reuse the value from the kernel.
1388          * XXX todo: support reuse of the mask.
1389          */
1390         if (p)
1391                 p->bandwidth = -1;
1392         for (j = 0; j < sizeof(fs->par)/sizeof(fs->par[0]); j++)
1393                 fs->par[j] = -1;
1394         while (ac > 0) {
1395                 double d;
1396                 int tok = match_token(dummynet_params, *av);
1397                 ac--; av++;
1398
1399                 switch(tok) {
1400                 case TOK_NOERROR:
1401                         NEED(fs, "noerror is only for pipes");
1402                         fs->flags |= DN_NOERROR;
1403                         break;
1404
1405                 case TOK_PLR:
1406                         NEED(fs, "plr is only for pipes");
1407                         NEED1("plr needs argument 0..1\n");
1408                         d = strtod(av[0], NULL);
1409                         if (d > 1)
1410                                 d = 1;
1411                         else if (d < 0)
1412                                 d = 0;
1413                         fs->plr = (int)(d*0x7fffffff);
1414                         ac--; av++;
1415                         break;
1416
1417                 case TOK_QUEUE:
1418                         NEED(fs, "queue is only for pipes or flowsets");
1419                         NEED1("queue needs queue size\n");
1420                         end = NULL;
1421                         fs->qsize = strtoul(av[0], &end, 0);
1422                         if (*end == 'K' || *end == 'k') {
1423                                 fs->flags |= DN_QSIZE_BYTES;
1424                                 fs->qsize *= 1024;
1425                         } else if (*end == 'B' ||
1426                             _substrcmp2(end, "by", "bytes") == 0) {
1427                                 fs->flags |= DN_QSIZE_BYTES;
1428                         }
1429                         ac--; av++;
1430                         break;
1431
1432                 case TOK_BUCKETS:
1433                         NEED(fs, "buckets is only for pipes or flowsets");
1434                         NEED1("buckets needs argument\n");
1435                         *buckets = strtoul(av[0], NULL, 0);
1436                         ac--; av++;
1437                         break;
1438
1439                 case TOK_FLOW_MASK:
1440                 case TOK_SCHED_MASK:
1441                 case TOK_MASK:
1442                         NEED(mask, "tok_mask");
1443                         NEED1("mask needs mask specifier\n");
1444                         /*
1445                          * per-flow queue, mask is dst_ip, dst_port,
1446                          * src_ip, src_port, proto measured in bits
1447                          */
1448
1449                         bzero(mask, sizeof(*mask));
1450                         end = NULL;
1451
1452                         while (ac >= 1) {
1453                             uint32_t *p32 = NULL;
1454                             uint16_t *p16 = NULL;
1455                             uint32_t *p20 = NULL;
1456                             struct in6_addr *pa6 = NULL;
1457                             uint32_t a;
1458
1459                             tok = match_token(dummynet_params, *av);
1460                             ac--; av++;
1461                             switch(tok) {
1462                             case TOK_ALL:
1463                                     /*
1464                                      * special case, all bits significant
1465                                      * except 'extra' (the queue number)
1466                                      */
1467                                     mask->dst_ip = ~0;
1468                                     mask->src_ip = ~0;
1469                                     mask->dst_port = ~0;
1470                                     mask->src_port = ~0;
1471                                     mask->proto = ~0;
1472                                     n2mask(&mask->dst_ip6, 128);
1473                                     n2mask(&mask->src_ip6, 128);
1474                                     mask->flow_id6 = ~0;
1475                                     *flags |= DN_HAVE_MASK;
1476                                     goto end_mask;
1477
1478                             case TOK_QUEUE:
1479                                     mask->extra = ~0;
1480                                     *flags |= DN_HAVE_MASK;
1481                                     goto end_mask;
1482
1483                             case TOK_DSTIP:
1484                                     mask->addr_type = 4;
1485                                     p32 = &mask->dst_ip;
1486                                     break;
1487
1488                             case TOK_SRCIP:
1489                                     mask->addr_type = 4;
1490                                     p32 = &mask->src_ip;
1491                                     break;
1492
1493                             case TOK_DSTIP6:
1494                                     mask->addr_type = 6;
1495                                     pa6 = &mask->dst_ip6;
1496                                     break;
1497
1498                             case TOK_SRCIP6:
1499                                     mask->addr_type = 6;
1500                                     pa6 = &mask->src_ip6;
1501                                     break;
1502
1503                             case TOK_FLOWID:
1504                                     mask->addr_type = 6;
1505                                     p20 = &mask->flow_id6;
1506                                     break;
1507
1508                             case TOK_DSTPORT:
1509                                     p16 = &mask->dst_port;
1510                                     break;
1511
1512                             case TOK_SRCPORT:
1513                                     p16 = &mask->src_port;
1514                                     break;
1515
1516                             case TOK_PROTO:
1517                                     break;
1518
1519                             default:
1520                                     ac++; av--; /* backtrack */
1521                                     goto end_mask;
1522                             }
1523                             if (ac < 1)
1524                                     errx(EX_USAGE, "mask: value missing");
1525                             if (*av[0] == '/') {
1526                                     a = strtoul(av[0]+1, &end, 0);
1527                                     if (pa6 == NULL)
1528                                             a = (a == 32) ? ~0 : (1 << a) - 1;
1529                             } else
1530                                     a = strtoul(av[0], &end, 0);
1531                             if (p32 != NULL)
1532                                     *p32 = a;
1533                             else if (p16 != NULL) {
1534                                     if (a > 0xFFFF)
1535                                             errx(EX_DATAERR,
1536                                                 "port mask must be 16 bit");
1537                                     *p16 = (uint16_t)a;
1538                             } else if (p20 != NULL) {
1539                                     if (a > 0xfffff)
1540                                         errx(EX_DATAERR,
1541                                             "flow_id mask must be 20 bit");
1542                                     *p20 = (uint32_t)a;
1543                             } else if (pa6 != NULL) {
1544                                     if (a > 128)
1545                                         errx(EX_DATAERR,
1546                                             "in6addr invalid mask len");
1547                                     else
1548                                         n2mask(pa6, a);
1549                             } else {
1550                                     if (a > 0xFF)
1551                                             errx(EX_DATAERR,
1552                                                 "proto mask must be 8 bit");
1553                                     mask->proto = (uint8_t)a;
1554                             }
1555                             if (a != 0)
1556                                     *flags |= DN_HAVE_MASK;
1557                             ac--; av++;
1558                         } /* end while, config masks */
1559 end_mask:
1560                         break;
1561 #ifdef NEW_AQM
1562                 case TOK_CODEL:
1563                 case TOK_PIE:
1564                         NEED(fs, "codel/pie is only for flowsets");
1565
1566                         fs->flags &= ~(DN_IS_RED|DN_IS_GENTLE_RED);
1567                         fs->flags |= DN_IS_AQM;
1568
1569                         strlcpy(aqm_extra->name, av[-1],
1570                             sizeof(aqm_extra->name));
1571                         aqm_extra->oid.subtype = DN_AQM_PARAMS;
1572
1573                         process_extra_parms(&ac, av, aqm_extra, tok);
1574                         break;
1575
1576                 case TOK_FQ_CODEL:
1577                 case TOK_FQ_PIE:
1578                         if (!strcmp(av[-1],"type"))
1579                                 errx(EX_DATAERR, "use type before fq_codel/fq_pie");
1580
1581                         NEED(sch, "fq_codel/fq_pie is only for schd");
1582                         strlcpy(sch_extra->name, av[-1],
1583                             sizeof(sch_extra->name));
1584                         sch_extra->oid.subtype = DN_SCH_PARAMS;
1585                         process_extra_parms(&ac, av, sch_extra, tok);
1586                         break;
1587 #endif
1588                 case TOK_RED:
1589                 case TOK_GRED:
1590                         NEED1("red/gred needs w_q/min_th/max_th/max_p\n");
1591                         fs->flags |= DN_IS_RED;
1592                         if (tok == TOK_GRED)
1593                                 fs->flags |= DN_IS_GENTLE_RED;
1594                         /*
1595                          * the format for parameters is w_q/min_th/max_th/max_p
1596                          */
1597                         if ((end = strsep(&av[0], "/"))) {
1598                             double w_q = strtod(end, NULL);
1599                             if (w_q > 1 || w_q <= 0)
1600                                 errx(EX_DATAERR, "0 < w_q <= 1");
1601                             fs->w_q = (int) (w_q * (1 << SCALE_RED));
1602                         }
1603                         if ((end = strsep(&av[0], "/"))) {
1604                             fs->min_th = strtoul(end, &end, 0);
1605                             if (*end == 'K' || *end == 'k')
1606                                 fs->min_th *= 1024;
1607                         }
1608                         if ((end = strsep(&av[0], "/"))) {
1609                             fs->max_th = strtoul(end, &end, 0);
1610                             if (*end == 'K' || *end == 'k')
1611                                 fs->max_th *= 1024;
1612                         }
1613                         if ((end = strsep(&av[0], "/"))) {
1614                             double max_p = strtod(end, NULL);
1615                             if (max_p > 1 || max_p < 0)
1616                                 errx(EX_DATAERR, "0 <= max_p <= 1");
1617                             fs->max_p = (int)(max_p * (1 << SCALE_RED));
1618                         }
1619                         ac--; av++;
1620                         break;
1621
1622                 case TOK_ECN:
1623                         fs->flags |= DN_IS_ECN;
1624                         break;
1625
1626                 case TOK_DROPTAIL:
1627                         NEED(fs, "droptail is only for flowsets");
1628                         fs->flags &= ~(DN_IS_RED|DN_IS_GENTLE_RED);
1629                         break;
1630
1631                 case TOK_BW:
1632                         NEED(p, "bw is only for links");
1633                         NEED1("bw needs bandwidth or interface\n");
1634                         read_bandwidth(av[0], &p->bandwidth, NULL, 0);
1635                         ac--; av++;
1636                         break;
1637
1638                 case TOK_DELAY:
1639                         NEED(p, "delay is only for links");
1640                         NEED1("delay needs argument 0..10000ms\n");
1641                         p->delay = strtoul(av[0], NULL, 0);
1642                         ac--; av++;
1643                         break;
1644
1645                 case TOK_TYPE: {
1646                         int l;
1647                         NEED(sch, "type is only for schedulers");
1648                         NEED1("type needs a string");
1649                         l = strlen(av[0]);
1650                         if (l == 0 || l > 15)
1651                                 errx(1, "type %s too long\n", av[0]);
1652                         strlcpy(sch->name, av[0], sizeof(sch->name));
1653                         sch->oid.subtype = 0; /* use string */
1654 #ifdef NEW_AQM
1655                         /* if fq_codel is selected, consider all tokens after it
1656                          * as parameters
1657                          */
1658                         if (!strcasecmp(av[0],"fq_codel") || !strcasecmp(av[0],"fq_pie")){
1659                                 strlcpy(sch_extra->name, av[0],
1660                                     sizeof(sch_extra->name));
1661                                 sch_extra->oid.subtype = DN_SCH_PARAMS;
1662                                 process_extra_parms(&ac, av, sch_extra, tok);
1663                         } else {
1664                                 ac--;av++;
1665                         }
1666 #else
1667                         ac--;av++;
1668 #endif
1669                         break;
1670                     }
1671
1672                 case TOK_WEIGHT:
1673                         NEED(fs, "weight is only for flowsets");
1674                         NEED1("weight needs argument\n");
1675                         fs->par[0] = strtol(av[0], &end, 0);
1676                         ac--; av++;
1677                         break;
1678
1679                 case TOK_LMAX:
1680                         NEED(fs, "lmax is only for flowsets");
1681                         NEED1("lmax needs argument\n");
1682                         fs->par[1] = strtol(av[0], &end, 0);
1683                         ac--; av++;
1684                         break;
1685
1686                 case TOK_PRI:
1687                         NEED(fs, "priority is only for flowsets");
1688                         NEED1("priority needs argument\n");
1689                         fs->par[2] = strtol(av[0], &end, 0);
1690                         ac--; av++;
1691                         break;
1692
1693                 case TOK_SCHED:
1694                 case TOK_PIPE:
1695                         NEED(fs, "pipe/sched");
1696                         NEED1("pipe/link/sched needs number\n");
1697                         fs->sched_nr = strtoul(av[0], &end, 0);
1698                         ac--; av++;
1699                         break;
1700
1701                 case TOK_PROFILE:
1702                         NEED((!pf), "profile already set");
1703                         NEED(p, "profile");
1704                     {
1705                         NEED1("extra delay needs the file name\n");
1706                         pf = o_next(&buf, sizeof(*pf), DN_PROFILE);
1707                         load_extra_delays(av[0], pf, p); //XXX can't fail?
1708                         --ac; ++av;
1709                     }
1710                         break;
1711
1712                 case TOK_BURST:
1713                         NEED(p, "burst");
1714                         NEED1("burst needs argument\n");
1715                         errno = 0;
1716                         if (expand_number(av[0], &p->burst) < 0)
1717                                 if (errno != ERANGE)
1718                                         errx(EX_DATAERR,
1719                                             "burst: invalid argument");
1720                         if (errno || p->burst > (1ULL << 48) - 1)
1721                                 errx(EX_DATAERR,
1722                                     "burst: out of range (0..2^48-1)");
1723                         ac--; av++;
1724                         break;
1725
1726                 default:
1727                         errx(EX_DATAERR, "unrecognised option ``%s''", av[-1]);
1728                 }
1729         }
1730
1731         /* check validity of parameters */
1732         if (p) {
1733                 if (p->delay > 10000)
1734                         errx(EX_DATAERR, "delay must be < 10000");
1735                 if (p->bandwidth == -1)
1736                         p->bandwidth = 0;
1737         }
1738         if (fs) {
1739                 /* XXX accept a 0 scheduler to keep the default */
1740             if (fs->flags & DN_QSIZE_BYTES) {
1741                 size_t len;
1742                 long limit;
1743
1744                 len = sizeof(limit);
1745                 if (sysctlbyname("net.inet.ip.dummynet.pipe_byte_limit",
1746                         &limit, &len, NULL, 0) == -1)
1747                         limit = 1024*1024;
1748                 if (fs->qsize > limit)
1749                         errx(EX_DATAERR, "queue size must be < %ldB", limit);
1750             } else {
1751                 size_t len;
1752                 long limit;
1753
1754                 len = sizeof(limit);
1755                 if (sysctlbyname("net.inet.ip.dummynet.pipe_slot_limit",
1756                         &limit, &len, NULL, 0) == -1)
1757                         limit = 100;
1758                 if (fs->qsize > limit)
1759                         errx(EX_DATAERR, "2 <= queue size <= %ld", limit);
1760             }
1761
1762 #ifdef NEW_AQM
1763                 if ((fs->flags & DN_IS_ECN) && !((fs->flags & DN_IS_RED)||
1764                         (fs->flags & DN_IS_AQM)))
1765                         errx(EX_USAGE, "ECN can be used with red/gred/"
1766                                 "codel/fq_codel only!");
1767 #else
1768             if ((fs->flags & DN_IS_ECN) && !(fs->flags & DN_IS_RED))
1769                 errx(EX_USAGE, "enable red/gred for ECN");
1770
1771 #endif
1772
1773             if (fs->flags & DN_IS_RED) {
1774                 size_t len;
1775                 int lookup_depth, avg_pkt_size;
1776
1777                 if (!(fs->flags & DN_IS_ECN) && (fs->min_th >= fs->max_th))
1778                     errx(EX_DATAERR, "min_th %d must be < than max_th %d",
1779                         fs->min_th, fs->max_th);
1780                 else if ((fs->flags & DN_IS_ECN) && (fs->min_th > fs->max_th))
1781                     errx(EX_DATAERR, "min_th %d must be =< than max_th %d",
1782                         fs->min_th, fs->max_th);
1783
1784                 if (fs->max_th == 0)
1785                     errx(EX_DATAERR, "max_th must be > 0");
1786
1787                 len = sizeof(int);
1788                 if (sysctlbyname("net.inet.ip.dummynet.red_lookup_depth",
1789                         &lookup_depth, &len, NULL, 0) == -1)
1790                         lookup_depth = 256;
1791                 if (lookup_depth == 0)
1792                     errx(EX_DATAERR, "net.inet.ip.dummynet.red_lookup_depth"
1793                         " must be greater than zero");
1794
1795                 len = sizeof(int);
1796                 if (sysctlbyname("net.inet.ip.dummynet.red_avg_pkt_size",
1797                         &avg_pkt_size, &len, NULL, 0) == -1)
1798                         avg_pkt_size = 512;
1799
1800                 if (avg_pkt_size == 0)
1801                         errx(EX_DATAERR,
1802                             "net.inet.ip.dummynet.red_avg_pkt_size must"
1803                             " be greater than zero");
1804
1805 #if 0 /* the following computation is now done in the kernel */
1806                 /*
1807                  * Ticks needed for sending a medium-sized packet.
1808                  * Unfortunately, when we are configuring a WF2Q+ queue, we
1809                  * do not have bandwidth information, because that is stored
1810                  * in the parent pipe, and also we have multiple queues
1811                  * competing for it. So we set s=0, which is not very
1812                  * correct. But on the other hand, why do we want RED with
1813                  * WF2Q+ ?
1814                  */
1815                 if (p.bandwidth==0) /* this is a WF2Q+ queue */
1816                         s = 0;
1817                 else
1818                         s = (double)ck.hz * avg_pkt_size * 8 / p.bandwidth;
1819                 /*
1820                  * max idle time (in ticks) before avg queue size becomes 0.
1821                  * NOTA:  (3/w_q) is approx the value x so that
1822                  * (1-w_q)^x < 10^-3.
1823                  */
1824                 w_q = ((double)fs->w_q) / (1 << SCALE_RED);
1825                 idle = s * 3. / w_q;
1826                 fs->lookup_step = (int)idle / lookup_depth;
1827                 if (!fs->lookup_step)
1828                         fs->lookup_step = 1;
1829                 weight = 1 - w_q;
1830                 for (t = fs->lookup_step; t > 1; --t)
1831                         weight *= 1 - w_q;
1832                 fs->lookup_weight = (int)(weight * (1 << SCALE_RED));
1833 #endif /* code moved in the kernel */
1834             }
1835         }
1836
1837         i = do_cmd(IP_DUMMYNET3, base, (char *)buf - (char *)base);
1838
1839         if (i)
1840                 err(1, "setsockopt(%s)", "IP_DUMMYNET_CONFIGURE");
1841 }
1842
1843 void
1844 dummynet_flush(void)
1845 {
1846         struct dn_id oid;
1847         oid_fill(&oid, sizeof(oid), DN_CMD_FLUSH, DN_API_VERSION);
1848         do_cmd(IP_DUMMYNET3, &oid, oid.len);
1849 }
1850
1851 /* Parse input for 'ipfw [pipe|sched|queue] show [range list]'
1852  * Returns the number of ranges, and possibly stores them
1853  * in the array v of size len.
1854  */
1855 static int
1856 parse_range(int ac, char *av[], uint32_t *v, int len)
1857 {
1858         int n = 0;
1859         char *endptr, *s;
1860         uint32_t base[2];
1861
1862         if (v == NULL || len < 2) {
1863                 v = base;
1864                 len = 2;
1865         }
1866
1867         for (s = *av; s != NULL; av++, ac--) {
1868                 v[0] = strtoul(s, &endptr, 10);
1869                 v[1] = (*endptr != '-') ? v[0] :
1870                          strtoul(endptr+1, &endptr, 10);
1871                 if (*endptr == '\0') { /* prepare for next round */
1872                         s = (ac > 0) ? *(av+1) : NULL;
1873                 } else {
1874                         if (*endptr != ',') {
1875                                 warn("invalid number: %s", s);
1876                                 s = ++endptr;
1877                                 continue;
1878                         }
1879                         /* continue processing from here */
1880                         s = ++endptr;
1881                         ac++;
1882                         av--;
1883                 }
1884                 if (v[1] < v[0] ||
1885                         v[0] >= DN_MAX_ID-1 ||
1886                         v[1] >= DN_MAX_ID-1) {
1887                         continue; /* invalid entry */
1888                 }
1889                 n++;
1890                 /* translate if 'pipe list' */
1891                 if (co.do_pipe == 1) {
1892                         v[0] += DN_MAX_ID;
1893                         v[1] += DN_MAX_ID;
1894                 }
1895                 v = (n*2 < len) ? v + 2 : base;
1896         }
1897         return n;
1898 }
1899
1900 /* main entry point for dummynet list functions. co.do_pipe indicates
1901  * which function we want to support.
1902  * av may contain filtering arguments, either individual entries
1903  * or ranges, or lists (space or commas are valid separators).
1904  * Format for a range can be n1-n2 or n3 n4 n5 ...
1905  * In a range n1 must be <= n2, otherwise the range is ignored.
1906  * A number 'n4' is translate in a range 'n4-n4'
1907  * All number must be > 0 and < DN_MAX_ID-1
1908  */
1909 void
1910 dummynet_list(int ac, char *av[], int show_counters)
1911 {
1912         struct dn_id *oid, *x = NULL;
1913         int ret, i;
1914         int n;          /* # of ranges */
1915         u_int buflen, l;
1916         u_int max_size; /* largest obj passed up */
1917
1918         (void)show_counters;    // XXX unused, but we should use it.
1919         ac--;
1920         av++;           /* skip 'list' | 'show' word */
1921
1922         n = parse_range(ac, av, NULL, 0);       /* Count # of ranges. */
1923
1924         /* Allocate space to store ranges */
1925         l = sizeof(*oid) + sizeof(uint32_t) * n * 2;
1926         oid = safe_calloc(1, l);
1927         oid_fill(oid, l, DN_CMD_GET, DN_API_VERSION);
1928
1929         if (n > 0)      /* store ranges in idx */
1930                 parse_range(ac, av, (uint32_t *)(oid + 1), n*2);
1931         /*
1932          * Compute the size of the largest object returned. If the
1933          * response leaves at least this much spare space in the
1934          * buffer, then surely the response is complete; otherwise
1935          * there might be a risk of truncation and we will need to
1936          * retry with a larger buffer.
1937          * XXX don't bother with smaller structs.
1938          */
1939         max_size = sizeof(struct dn_fs);
1940         if (max_size < sizeof(struct dn_sch))
1941                 max_size = sizeof(struct dn_sch);
1942         if (max_size < sizeof(struct dn_flow))
1943                 max_size = sizeof(struct dn_flow);
1944
1945         switch (co.do_pipe) {
1946         case 1:
1947                 oid->subtype = DN_LINK; /* list pipe */
1948                 break;
1949         case 2:
1950                 oid->subtype = DN_FS;   /* list queue */
1951                 break;
1952         case 3:
1953                 oid->subtype = DN_SCH;  /* list sched */
1954                 break;
1955         }
1956
1957         /*
1958          * Ask the kernel an estimate of the required space (result
1959          * in oid.id), unless we are requesting a subset of objects,
1960          * in which case the kernel does not give an exact answer.
1961          * In any case, space might grow in the meantime due to the
1962          * creation of new queues, so we must be prepared to retry.
1963          */
1964         if (n > 0) {
1965                 buflen = 4*1024;
1966         } else {
1967                 ret = do_cmd(-IP_DUMMYNET3, oid, (uintptr_t)&l);
1968                 if (ret != 0 || oid->id <= sizeof(*oid))
1969                         goto done;
1970                 buflen = oid->id + max_size;
1971                 oid->len = sizeof(*oid); /* restore */
1972         }
1973         /* Try a few times, until the buffer fits */
1974         for (i = 0; i < 20; i++) {
1975                 l = buflen;
1976                 x = safe_realloc(x, l);
1977                 bcopy(oid, x, oid->len);
1978                 ret = do_cmd(-IP_DUMMYNET3, x, (uintptr_t)&l);
1979                 if (ret != 0 || x->id <= sizeof(*oid))
1980                         goto done; /* no response */
1981                 if (l + max_size <= buflen)
1982                         break; /* ok */
1983                 buflen *= 2;     /* double for next attempt */
1984         }
1985         list_pipes(x, O_NEXT(x, l));
1986 done:
1987         if (x)
1988                 free(x);
1989         free(oid);
1990 }