tc/q_sfq.c

   1 /*
   2  * q_sfq.c              SFQ.
   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:     Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
  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 static void explain(void)
  27 {
  28         fprintf(stderr, "Usage: ... sfq [ limit NUMBER ] [ perturb SECS ] [ quantum BYTES ]\n");
  29 }
  30
  31 static int sfq_parse_opt(struct qdisc_util *qu, int argc, char **argv, struct nlmsghdr *n)
  32 {
  33         int ok=0;
  34         struct tc_sfq_qopt opt;
  35
  36         memset(&opt, 0, sizeof(opt));
  37
  38         while (argc > 0) {
  39                 if (strcmp(*argv, "quantum") == 0) {
  40                         NEXT_ARG();
  41                         if (get_size(&opt.quantum, *argv)) {
  42                                 fprintf(stderr, "Illegal \"limit\"\n");
  43                                 return -1;
  44                         }
  45                         ok++;
  46                 } else if (strcmp(*argv, "perturb") == 0) {
  47                         NEXT_ARG();
  48                         if (get_integer(&opt.perturb_period, *argv, 0)) {
  49                                 fprintf(stderr, "Illegal \"perturb\"\n");
  50                                 return -1;
  51                         }
  52                         ok++;
  53                 } else if (strcmp(*argv, "limit") == 0) {
  54                         NEXT_ARG();
  55                         if (get_u32(&opt.limit, *argv, 0)) {
  56                                 fprintf(stderr, "Illegal \"limit\"\n");
  57                                 return -1;
  58                         }
  59                         if (opt.limit < 2) {
  60                                 fprintf(stderr, "Illegal \"limit\", must be > 1\n");
  61                                 return -1;
  62                         }
  63                         ok++;
  64                 } else if (strcmp(*argv, "help") == 0) {
  65                         explain();
  66                         return -1;
  67                 } else {
  68                         fprintf(stderr, "What is \"%s\"?\n", *argv);
  69                         explain();
  70                         return -1;
  71                 }
  72                 argc--; argv++;
  73         }
  74
  75         if (ok)
  76                 addattr_l(n, 1024, TCA_OPTIONS, &opt, sizeof(opt));
  77         return 0;
  78 }
  79
  80 static int sfq_print_opt(struct qdisc_util *qu, FILE *f, struct rtattr *opt)
  81 {
  82         struct tc_sfq_qopt *qopt;
  83         SPRINT_BUF(b1);
  84
  85         if (opt == NULL)
  86                 return 0;
  87
  88         if (RTA_PAYLOAD(opt)  < sizeof(*qopt))
  89                 return -1;
  90         qopt = RTA_DATA(opt);
  91         fprintf(f, "limit %up ", qopt->limit);
  92         fprintf(f, "quantum %s ", sprint_size(qopt->quantum, b1));
  93         if (show_details) {
  94                 fprintf(f, "flows %u/%u ", qopt->flows, qopt->divisor);
  95         }
  96         if (qopt->perturb_period)
  97                 fprintf(f, "perturb %dsec ", qopt->perturb_period);
  98         return 0;
  99 }
 100
 101 static int sfq_print_xstats(struct qdisc_util *qu, FILE *f,
 102                             struct rtattr *xstats)
 103 {
 104         struct tc_sfq_xstats *st;
 105
 106         if (xstats == NULL)
 107                 return 0;
 108         if (RTA_PAYLOAD(xstats) < sizeof(*st))
 109                 return -1;
 110         st = RTA_DATA(xstats);
 111
 112         fprintf(f, " allot %d ", st->allot);
 113         fprintf(f, "\n");
 114         return 0;
 115 }
 116
 117 struct qdisc_util sfq_qdisc_util = {
 118         .id             = "sfq",
 119         .parse_qopt     = sfq_parse_opt,
 120         .print_qopt     = sfq_print_opt,
 121         .print_xstats   = sfq_print_xstats,
 122 };