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
  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 #define usage() return(-1)
  62
  63 static int htb_parse_opt(struct qdisc_util *qu, int argc, char **argv, struct nlmsghdr *n)
  64 {
  65         struct tc_htb_glob opt;
  66         struct rtattr *tail;
  67         unsigned i; char *p;
  68         memset(&opt,0,sizeof(opt));
  69         opt.rate2quantum = 10;
  70         opt.version = 3;
  71
  72         while (argc > 0) {
  73                 if (matches(*argv, "r2q") == 0) {
  74                     NEXT_ARG();
  75                     if (get_u32(&opt.rate2quantum, *argv, 10)) {
  76                         explain1("r2q"); return -1;
  77                     }
  78                 } else if (matches(*argv, "default") == 0) {
  79                     NEXT_ARG();
  80                     if (get_u32(&opt.defcls, *argv, 16)) {
  81                         explain1("default"); return -1;
  82                     }
  83                 } else if (matches(*argv, "debug") == 0) {
  84                     NEXT_ARG(); p = *argv;
  85                     for (i=0; i<16; i++,p++) {
  86                         if (*p<'0' || *p>'3') break;
  87                         opt.debug |= (*p-'0')<<(2*i);
  88                     }
  89                 } else {
  90                         fprintf(stderr, "What is \"%s\"?\n", *argv);
  91                         explain();
  92                         return -1;
  93                 }
  94                 argc--; argv++;
  95         }
  96         tail = NLMSG_TAIL(n);
  97         addattr_l(n, 1024, TCA_OPTIONS, NULL, 0);
  98         addattr_l(n, 2024, TCA_HTB_INIT, &opt, NLMSG_ALIGN(sizeof(opt)));
  99         tail->rta_len = (void *) NLMSG_TAIL(n) - (void *) tail;
 100         return 0;
 101 }
 102
 103 static int htb_parse_class_opt(struct qdisc_util *qu, int argc, char **argv, struct nlmsghdr *n)
 104 {
 105         int ok=0;
 106         struct tc_htb_opt opt;
 107         __u32 rtab[256],ctab[256];
 108         unsigned buffer=0,cbuffer=0;
 109         int cell_log=-1,ccell_log = -1;
 110         unsigned mtu, mpu;
 111         unsigned char mpu8 = 0, overhead = 0;
 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_u8(&mpu8, *argv, 10)) {
 131                                 explain1("mpu"); return -1;
 132                         }
 133                 } else if (matches(*argv, "overhead") == 0) {
 134                         NEXT_ARG();
 135                         if (get_u8(&overhead, *argv, 10)) {
 136                                 explain1("overhead"); return -1;
 137                         }
 138                 } else if (matches(*argv, "quantum") == 0) {
 139                         NEXT_ARG();
 140                         if (get_u32(&opt.quantum, *argv, 10)) {
 141                                 explain1("quantum"); return -1;
 142                         }
 143                 } else if (matches(*argv, "burst") == 0 ||
 144                         strcmp(*argv, "buffer") == 0 ||
 145                         strcmp(*argv, "maxburst") == 0) {
 146                         NEXT_ARG();
 147                         if (get_size_and_cell(&buffer, &cell_log, *argv) < 0) {
 148                                 explain1("buffer");
 149                                 return -1;
 150                         }
 151                         ok++;
 152                 } else if (matches(*argv, "cburst") == 0 ||
 153                         strcmp(*argv, "cbuffer") == 0 ||
 154                         strcmp(*argv, "cmaxburst") == 0) {
 155                         NEXT_ARG();
 156                         if (get_size_and_cell(&cbuffer, &ccell_log, *argv) < 0) {
 157                                 explain1("cbuffer");
 158                                 return -1;
 159                         }
 160                         ok++;
 161                 } else if (strcmp(*argv, "ceil") == 0) {
 162                         NEXT_ARG();
 163                         if (opt.ceil.rate) {
 164                                 fprintf(stderr, "Double \"ceil\" spec\n");
 165                                 return -1;
 166                         }
 167                         if (get_rate(&opt.ceil.rate, *argv)) {
 168                                 explain1("ceil");
 169                                 return -1;
 170                         }
 171                         ok++;
 172                 } else if (strcmp(*argv, "rate") == 0) {
 173                         NEXT_ARG();
 174                         if (opt.rate.rate) {
 175                                 fprintf(stderr, "Double \"rate\" spec\n");
 176                                 return -1;
 177                         }
 178                         if (get_rate(&opt.rate.rate, *argv)) {
 179                                 explain1("rate");
 180                                 return -1;
 181                         }
 182                         ok++;
 183                 } else if (strcmp(*argv, "help") == 0) {
 184                         explain();
 185                         return -1;
 186                 } else {
 187                         fprintf(stderr, "What is \"%s\"?\n", *argv);
 188                         explain();
 189                         return -1;
 190                 }
 191                 argc--; argv++;
 192         }
 193
 194 /*      if (!ok)
 195                 return 0;*/
 196
 197         if (opt.rate.rate == 0) {
 198                 fprintf(stderr, "\"rate\" is required.\n");
 199                 return -1;
 200         }
 201         /* if ceil params are missing, use the same as rate */
 202         if (!opt.ceil.rate) opt.ceil = opt.rate;
 203
 204         /* compute minimal allowed burst from rate; mtu is added here to make
 205            sute that buffer is larger than mtu and to have some safeguard space */
 206         if (!buffer) buffer = opt.rate.rate / get_hz() + mtu;
 207         if (!cbuffer) cbuffer = opt.ceil.rate / get_hz() + mtu;
 208
 209 /* encode overhead and mpu, 8 bits each, into lower 16 bits */
 210         mpu = (unsigned)mpu8 | (unsigned)overhead << 8;
 211         opt.ceil.mpu = mpu; opt.rate.mpu = mpu;
 212
 213         if ((cell_log = tc_calc_rtable(opt.rate.rate, rtab, cell_log, mtu, mpu)) < 0) {
 214                 fprintf(stderr, "htb: failed to calculate rate table.\n");
 215                 return -1;
 216         }
 217         opt.buffer = tc_calc_xmittime(opt.rate.rate, buffer);
 218         opt.rate.cell_log = cell_log;
 219
 220         if ((ccell_log = tc_calc_rtable(opt.ceil.rate, ctab, cell_log, mtu, mpu)) < 0) {
 221                 fprintf(stderr, "htb: failed to calculate ceil rate table.\n");
 222                 return -1;
 223         }
 224         opt.cbuffer = tc_calc_xmittime(opt.ceil.rate, cbuffer);
 225         opt.ceil.cell_log = ccell_log;
 226
 227         tail = NLMSG_TAIL(n);
 228         addattr_l(n, 1024, TCA_OPTIONS, NULL, 0);
 229         addattr_l(n, 2024, TCA_HTB_PARMS, &opt, sizeof(opt));
 230         addattr_l(n, 3024, TCA_HTB_RTAB, rtab, 1024);
 231         addattr_l(n, 4024, TCA_HTB_CTAB, ctab, 1024);
 232         tail->rta_len = (void *) NLMSG_TAIL(n) - (void *) tail;
 233         return 0;
 234 }
 235
 236 static int htb_print_opt(struct qdisc_util *qu, FILE *f, struct rtattr *opt)
 237 {
 238         struct rtattr *tb[TCA_HTB_RTAB+1];
 239         struct tc_htb_opt *hopt;
 240         struct tc_htb_glob *gopt;
 241         double buffer,cbuffer;
 242         SPRINT_BUF(b1);
 243         SPRINT_BUF(b2);
 244         SPRINT_BUF(b3);
 245
 246         if (opt == NULL)
 247                 return 0;
 248
 249         parse_rtattr_nested(tb, TCA_HTB_RTAB, opt);
 250
 251         if (tb[TCA_HTB_PARMS]) {
 252
 253             hopt = RTA_DATA(tb[TCA_HTB_PARMS]);
 254             if (RTA_PAYLOAD(tb[TCA_HTB_PARMS])  < sizeof(*hopt)) return -1;
 255
 256                 if (!hopt->level) {
 257                         fprintf(f, "prio %d ", (int)hopt->prio);
 258                         if (show_details)
 259                                 fprintf(f, "quantum %d ", (int)hopt->quantum);
 260                 }
 261             fprintf(f, "rate %s ", sprint_rate(hopt->rate.rate, b1));
 262             buffer = ((double)hopt->rate.rate*tc_core_tick2usec(hopt->buffer))/1000000;
 263             fprintf(f, "ceil %s ", sprint_rate(hopt->ceil.rate, b1));
 264             cbuffer = ((double)hopt->ceil.rate*tc_core_tick2usec(hopt->cbuffer))/1000000;
 265             if (show_details) {
 266                 fprintf(f, "burst %s/%u mpu %s overhead %s ",
 267                         sprint_size(buffer, b1),
 268                         1<<hopt->rate.cell_log,
 269                         sprint_size(hopt->rate.mpu&0xFF, b2),
 270                         sprint_size((hopt->rate.mpu>>8)&0xFF, b3));
 271                 fprintf(f, "cburst %s/%u mpu %s overhead %s ",
 272                         sprint_size(cbuffer, b1),
 273                         1<<hopt->ceil.cell_log,
 274                         sprint_size(hopt->ceil.mpu&0xFF, b2),
 275                         sprint_size((hopt->ceil.mpu>>8)&0xFF, b3));
 276                 fprintf(f, "level %d ", (int)hopt->level);
 277             } else {
 278                 fprintf(f, "burst %s ", sprint_size(buffer, b1));
 279                 fprintf(f, "cburst %s ", sprint_size(cbuffer, b1));
 280             }
 281             if (show_raw)
 282                 fprintf(f, "buffer [%08x] cbuffer [%08x] ",
 283                         hopt->buffer,hopt->cbuffer);
 284         }
 285         if (tb[TCA_HTB_INIT]) {
 286             gopt = RTA_DATA(tb[TCA_HTB_INIT]);
 287             if (RTA_PAYLOAD(tb[TCA_HTB_INIT])  < sizeof(*gopt)) return -1;
 288
 289             fprintf(f, "r2q %d default %x direct_packets_stat %u",
 290                     gopt->rate2quantum,gopt->defcls,gopt->direct_pkts);
 291                 if (show_details)
 292                         fprintf(f," ver %d.%d",gopt->version >> 16,gopt->version & 0xffff);
 293         }
 294         return 0;
 295 }
 296
 297 static int htb_print_xstats(struct qdisc_util *qu, FILE *f, struct rtattr *xstats)
 298 {
 299         struct tc_htb_xstats *st;
 300         if (xstats == NULL)
 301                 return 0;
 302
 303         if (RTA_PAYLOAD(xstats) < sizeof(*st))
 304                 return -1;
 305
 306         st = RTA_DATA(xstats);
 307         fprintf(f, " lended: %u borrowed: %u giants: %u\n",
 308                 st->lends,st->borrows,st->giants);
 309         fprintf(f, " tokens: %d ctokens: %d\n", st->tokens,st->ctokens);
 310         return 0;
 311 }
 312
 313 struct qdisc_util htb_qdisc_util = {
 314         .id             = "htb",
 315         .parse_qopt     = htb_parse_opt,
 316         .print_qopt     = htb_print_opt,
 317         .print_xstats   = htb_print_xstats,
 318         .parse_copt     = htb_parse_class_opt,
 319         .print_copt     = htb_print_opt,
 320 };
 321
 322 /* for testing of old one */
 323 struct qdisc_util htb2_qdisc_util = {
 324         .id             =  "htb2",
 325         .parse_qopt     = htb_parse_opt,
 326         .print_qopt     = htb_print_opt,
 327         .print_xstats   = htb_print_xstats,
 328         .parse_copt     = htb_parse_class_opt,
 329         .print_copt     = htb_print_opt,
 330 };