tc/q_htb.c

   1 /*
   2  * q_htb.c              HTB.
   3  *
   4  *              This program is free software; you can redistribute it and/or
   5  *              modify it under the terms of the GNU General Public License
   6  *              as published by the Free Software Foundation; either version
   7  *              2 of the License, or (at your option) any later version.
   8  *
   9  * Authors:     Martin Devera, devik@cdi.cz
  10  *
  11  */
  12
  13 #include <stdio.h>
  14 #include <stdlib.h>
  15 #include <unistd.h>
  16 #include <syslog.h>
  17 #include <fcntl.h>
  18 #include <sys/socket.h>
  19 #include <netinet/in.h>
  20 #include <arpa/inet.h>
  21 #include <string.h>
  22
  23 #include "utils.h"
  24 #include "tc_util.h"
  25
  26 #define HTB_TC_VER 0x30003
  27 #if HTB_TC_VER >> 16 != TC_HTB_PROTOVER
  28 #error "Different kernel and TC HTB versions"
  29 #endif
  30
  31 static void explain(void)
  32 {
  33         fprintf(stderr, "Usage: ... qdisc add ... htb [default N] [r2q N]\n"
  34                 " default  minor id of class to which unclassified packets are sent {0}\n"
  35                 " r2q      DRR quantums are computed as rate in Bps/r2q {10}\n"
  36                 " debug    string of 16 numbers each 0-3 {0}\n\n"
  37                 "... class add ... htb rate R1 [burst B1] [mpu B] [overhead O]\n"
  38                 "                      [prio P] [slot S] [pslot PS]\n"
  39                 "                      [ceil R2] [cburst B2] [mtu MTU] [quantum Q]\n"
  40                 " rate     rate allocated to this class (class can still borrow)\n"
  41                 " burst    max bytes burst which can be accumulated during idle period {computed}\n"
  42                 " mpu      minimum packet size used in rate computations\n"
  43                 " overhead per-packet size overhead used in rate computations\n"
  44                 " linklay  adapting to a linklayer e.g. atm\n"
  45                 " ceil     definite upper class rate (no borrows) {rate}\n"
  46                 " cburst   burst but for ceil {computed}\n"
  47                 " mtu      max packet size we create rate map for {1600}\n"
  48                 " prio     priority of leaf; lower are served first {0}\n"
  49                 " quantum  how much bytes to serve from leaf at once {use r2q}\n"
  50                 "\nTC HTB version %d.%d\n",HTB_TC_VER>>16,HTB_TC_VER&0xffff
  51                 );
  52 }
  53
  54 static void explain1(char *arg)
  55 {
  56     fprintf(stderr, "Illegal \"%s\"\n", arg);
  57     explain();
  58 }
  59
  60
  61 static int htb_parse_opt(struct qdisc_util *qu, int argc, char **argv, struct nlmsghdr *n)
  62 {
  63         struct tc_htb_glob opt;
  64         struct rtattr *tail;
  65         unsigned i; char *p;
  66         memset(&opt,0,sizeof(opt));
  67         opt.rate2quantum = 10;
  68         opt.version = 3;
  69
  70         while (argc > 0) {
  71                 if (matches(*argv, "r2q") == 0) {
  72                         NEXT_ARG();
  73                         if (get_u32(&opt.rate2quantum, *argv, 10)) {
  74                                 explain1("r2q"); return -1;
  75                         }
  76                 } else if (matches(*argv, "default") == 0) {
  77                         NEXT_ARG();
  78                         if (get_u32(&opt.defcls, *argv, 16)) {
  79                                 explain1("default"); return -1;
  80                         }
  81                 } else if (matches(*argv, "debug") == 0) {
  82                         NEXT_ARG(); p = *argv;
  83                         for (i=0; i<16; i++,p++) {
  84                                 if (*p<'0' || *p>'3') break;
  85                                 opt.debug |= (*p-'0')<<(2*i);
  86                         }
  87                 } else {
  88                         fprintf(stderr, "What is \"%s\"?\n", *argv);
  89                         explain();
  90                         return -1;
  91                 }
  92                 argc--; argv++;
  93         }
  94         tail = NLMSG_TAIL(n);
  95         addattr_l(n, 1024, TCA_OPTIONS, NULL, 0);
  96         addattr_l(n, 2024, TCA_HTB_INIT, &opt, NLMSG_ALIGN(sizeof(opt)));
  97         tail->rta_len = (void *) NLMSG_TAIL(n) - (void *) tail;
  98         return 0;
  99 }
 100
 101 static int htb_parse_class_opt(struct qdisc_util *qu, int argc, char **argv, struct nlmsghdr *n)
 102 {
 103         int ok=0;
 104         struct tc_htb_opt opt;
 105         __u32 rtab[256],ctab[256];
 106         unsigned buffer=0,cbuffer=0;
 107         int cell_log=-1,ccell_log = -1;
 108         unsigned mtu;
 109         unsigned short mpu = 0;
 110         unsigned short overhead = 0;
 111         unsigned int linklayer  = LINKLAYER_ETHERNET; /* Assume ethernet */
 112         struct rtattr *tail;
 113
 114         memset(&opt, 0, sizeof(opt)); mtu = 1600; /* eth packet len */
 115
 116         while (argc > 0) {
 117                 if (matches(*argv, "prio") == 0) {
 118                         NEXT_ARG();
 119                         if (get_u32(&opt.prio, *argv, 10)) {
 120                                 explain1("prio"); return -1;
 121                         }
 122                         ok++;
 123                 } else if (matches(*argv, "mtu") == 0) {
 124                         NEXT_ARG();
 125                         if (get_u32(&mtu, *argv, 10)) {
 126                                 explain1("mtu"); return -1;
 127                         }
 128                 } else if (matches(*argv, "mpu") == 0) {
 129                         NEXT_ARG();
 130                         if (get_u16(&mpu, *argv, 10)) {
 131                                 explain1("mpu"); return -1;
 132                         }
 133                 } else if (matches(*argv, "overhead") == 0) {
 134                         NEXT_ARG();
 135                         if (get_u16(&overhead, *argv, 10)) {
 136                                 explain1("overhead"); return -1;
 137                         }
 138                 } else if (matches(*argv, "linklayer") == 0) {
 139                         NEXT_ARG();
 140                         if (get_linklayer(&linklayer, *argv)) {
 141                                 explain1("linklayer"); return -1;
 142                         }
 143                 } else if (matches(*argv, "quantum") == 0) {
 144                         NEXT_ARG();
 145                         if (get_u32(&opt.quantum, *argv, 10)) {
 146                                 explain1("quantum"); return -1;
 147                         }
 148                 } else if (matches(*argv, "burst") == 0 ||
 149                            strcmp(*argv, "buffer") == 0 ||
 150                            strcmp(*argv, "maxburst") == 0) {
 151                         NEXT_ARG();
 152                         if (get_size_and_cell(&buffer, &cell_log, *argv) < 0) {
 153                                 explain1("buffer");
 154                                 return -1;
 155                         }
 156                         ok++;
 157                 } else if (matches(*argv, "cburst") == 0 ||
 158                            strcmp(*argv, "cbuffer") == 0 ||
 159                            strcmp(*argv, "cmaxburst") == 0) {
 160                         NEXT_ARG();
 161                         if (get_size_and_cell(&cbuffer, &ccell_log, *argv) < 0) {
 162                                 explain1("cbuffer");
 163                                 return -1;
 164                         }
 165                         ok++;
 166                 } else if (strcmp(*argv, "ceil") == 0) {
 167                         NEXT_ARG();
 168                         if (opt.ceil.rate) {
 169                                 fprintf(stderr, "Double \"ceil\" spec\n");
 170                                 return -1;
 171                         }
 172                         if (get_rate(&opt.ceil.rate, *argv)) {
 173                                 explain1("ceil");
 174                                 return -1;
 175                         }
 176                         ok++;
 177                 } else if (strcmp(*argv, "rate") == 0) {
 178                         NEXT_ARG();
 179                         if (opt.rate.rate) {
 180                                 fprintf(stderr, "Double \"rate\" spec\n");
 181                                 return -1;
 182                         }
 183                         if (get_rate(&opt.rate.rate, *argv)) {
 184                                 explain1("rate");
 185                                 return -1;
 186                         }
 187                         ok++;
 188                 } else if (strcmp(*argv, "help") == 0) {
 189                         explain();
 190                         return -1;
 191                 } else {
 192                         fprintf(stderr, "What is \"%s\"?\n", *argv);
 193                         explain();
 194                         return -1;
 195                 }
 196                 argc--; argv++;
 197         }
 198
 199         /*      if (!ok)
 200                 return 0;*/
 201
 202         if (opt.rate.rate == 0) {
 203                 fprintf(stderr, "\"rate\" is required.\n");
 204                 return -1;
 205         }
 206         /* if ceil params are missing, use the same as rate */
 207         if (!opt.ceil.rate) opt.ceil = opt.rate;
 208
 209         /* compute minimal allowed burst from rate; mtu is added here to make
 210            sute that buffer is larger than mtu and to have some safeguard space */
 211         if (!buffer) buffer = opt.rate.rate / get_hz() + mtu;
 212         if (!cbuffer) cbuffer = opt.ceil.rate / get_hz() + mtu;
 213
 214         opt.ceil.overhead = overhead;
 215         opt.rate.overhead = overhead;
 216
 217         opt.ceil.mpu = mpu;
 218         opt.rate.mpu = mpu;
 219
 220         if (tc_calc_rtable(&opt.rate, rtab, cell_log, mtu, linklayer) < 0) {
 221                 fprintf(stderr, "htb: failed to calculate rate table.\n");
 222                 return -1;
 223         }
 224         opt.buffer = tc_calc_xmittime(opt.rate.rate, buffer);
 225
 226         if (tc_calc_rtable(&opt.ceil, ctab, ccell_log, mtu, linklayer) < 0) {
 227                 fprintf(stderr, "htb: failed to calculate ceil rate table.\n");
 228                 return -1;
 229         }
 230         opt.cbuffer = tc_calc_xmittime(opt.ceil.rate, cbuffer);
 231
 232         tail = NLMSG_TAIL(n);
 233         addattr_l(n, 1024, TCA_OPTIONS, NULL, 0);
 234         addattr_l(n, 2024, TCA_HTB_PARMS, &opt, sizeof(opt));
 235         addattr_l(n, 3024, TCA_HTB_RTAB, rtab, 1024);
 236         addattr_l(n, 4024, TCA_HTB_CTAB, ctab, 1024);
 237         tail->rta_len = (void *) NLMSG_TAIL(n) - (void *) tail;
 238         return 0;
 239 }
 240
 241 static int htb_print_opt(struct qdisc_util *qu, FILE *f, struct rtattr *opt)
 242 {
 243         struct rtattr *tb[TCA_HTB_RTAB+1];
 244         struct tc_htb_opt *hopt;
 245         struct tc_htb_glob *gopt;
 246         double buffer,cbuffer;
 247         unsigned int linklayer;
 248         SPRINT_BUF(b1);
 249         SPRINT_BUF(b2);
 250         SPRINT_BUF(b3);
 251         SPRINT_BUF(b4);
 252
 253         if (opt == NULL)
 254                 return 0;
 255
 256         parse_rtattr_nested(tb, TCA_HTB_RTAB, opt);
 257
 258         if (tb[TCA_HTB_PARMS]) {
 259                 hopt = RTA_DATA(tb[TCA_HTB_PARMS]);
 260                 if (RTA_PAYLOAD(tb[TCA_HTB_PARMS])  < sizeof(*hopt)) return -1;
 261
 262                 if (!hopt->level) {
 263                         fprintf(f, "prio %d ", (int)hopt->prio);
 264                         if (show_details)
 265                                 fprintf(f, "quantum %d ", (int)hopt->quantum);
 266                 }
 267                 fprintf(f, "rate %s ", sprint_rate(hopt->rate.rate, b1));
 268                 if (hopt->rate.overhead)
 269                         fprintf(f, "overhead %u ", hopt->rate.overhead);
 270                 buffer = tc_calc_xmitsize(hopt->rate.rate, hopt->buffer);
 271                 fprintf(f, "ceil %s ", sprint_rate(hopt->ceil.rate, b1));
 272                 cbuffer = tc_calc_xmitsize(hopt->ceil.rate, hopt->cbuffer);
 273                 linklayer = (hopt->rate.linklayer & TC_LINKLAYER_MASK);
 274                 if (linklayer > TC_LINKLAYER_ETHERNET || show_details)
 275                         fprintf(f, "linklayer %s ", sprint_linklayer(linklayer, b4));
 276                 if (show_details) {
 277                         fprintf(f, "burst %s/%u mpu %s overhead %s ",
 278                                 sprint_size(buffer, b1),
 279                                 1<<hopt->rate.cell_log,
 280                                 sprint_size(hopt->rate.mpu&0xFF, b2),
 281                                 sprint_size((hopt->rate.mpu>>8)&0xFF, b3));
 282                         fprintf(f, "cburst %s/%u mpu %s overhead %s ",
 283                                 sprint_size(cbuffer, b1),
 284                                 1<<hopt->ceil.cell_log,
 285                                 sprint_size(hopt->ceil.mpu&0xFF, b2),
 286                                 sprint_size((hopt->ceil.mpu>>8)&0xFF, b3));
 287                         fprintf(f, "level %d ", (int)hopt->level);
 288                 } else {
 289                         fprintf(f, "burst %s ", sprint_size(buffer, b1));
 290                         fprintf(f, "cburst %s ", sprint_size(cbuffer, b1));
 291                 }
 292                 if (show_raw)
 293                         fprintf(f, "buffer [%08x] cbuffer [%08x] ",
 294                                 hopt->buffer,hopt->cbuffer);
 295         }
 296         if (tb[TCA_HTB_INIT]) {
 297                 gopt = RTA_DATA(tb[TCA_HTB_INIT]);
 298                 if (RTA_PAYLOAD(tb[TCA_HTB_INIT])  < sizeof(*gopt)) return -1;
 299
 300                 fprintf(f, "r2q %d default %x direct_packets_stat %u",
 301                         gopt->rate2quantum,gopt->defcls,gopt->direct_pkts);
 302                 if (show_details)
 303                         fprintf(f," ver %d.%d",gopt->version >> 16,gopt->version & 0xffff);
 304         }
 305         return 0;
 306 }
 307
 308 static int htb_print_xstats(struct qdisc_util *qu, FILE *f, struct rtattr *xstats)
 309 {
 310         struct tc_htb_xstats *st;
 311         if (xstats == NULL)
 312                 return 0;
 313
 314         if (RTA_PAYLOAD(xstats) < sizeof(*st))
 315                 return -1;
 316
 317         st = RTA_DATA(xstats);
 318         fprintf(f, " lended: %u borrowed: %u giants: %u\n",
 319                 st->lends,st->borrows,st->giants);
 320         fprintf(f, " tokens: %d ctokens: %d\n", st->tokens,st->ctokens);
 321         return 0;
 322 }
 323
 324 struct qdisc_util htb_qdisc_util = {
 325         .id             = "htb",
 326         .parse_qopt     = htb_parse_opt,
 327         .print_qopt     = htb_print_opt,
 328         .print_xstats   = htb_print_xstats,
 329         .parse_copt     = htb_parse_class_opt,
 330         .print_copt     = htb_print_opt,
 331 };
 332
 333 /* for testing of old one */
 334 struct qdisc_util htb2_qdisc_util = {
 335         .id             =  "htb2",
 336         .parse_qopt     = htb_parse_opt,
 337         .print_qopt     = htb_print_opt,
 338         .print_xstats   = htb_print_xstats,
 339         .parse_copt     = htb_parse_class_opt,
 340         .print_copt     = htb_print_opt,
 341 };