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 #define usage() return(-1)
  32
  33 static int sfq_parse_opt(struct qdisc_util *qu, int argc, char **argv, struct nlmsghdr *n)
  34 {
  35         int ok=0;
  36         struct tc_sfq_qopt opt;
  37
  38         memset(&opt, 0, sizeof(opt));
  39
  40         while (argc > 0) {
  41                 if (strcmp(*argv, "quantum") == 0) {
  42                         NEXT_ARG();
  43                         if (get_size(&opt.quantum, *argv)) {
  44                                 fprintf(stderr, "Illegal \"limit\"\n");
  45                                 return -1;
  46                         }
  47                         ok++;
  48                 } else if (strcmp(*argv, "perturb") == 0) {
  49                         NEXT_ARG();
  50                         if (get_integer(&opt.perturb_period, *argv, 0)) {
  51                                 fprintf(stderr, "Illegal \"perturb\"\n");
  52                                 return -1;
  53                         }
  54                         ok++;
  55                 } else if (strcmp(*argv, "limit") == 0) {
  56                         NEXT_ARG();
  57                         if (get_u32(&opt.limit, *argv, 0)) {
  58                                 fprintf(stderr, "Illegal \"limit\"\n");
  59                                 return -1;
  60                         }
  61                         if (opt.limit < 2) {
  62                                 fprintf(stderr, "Illegal \"limit\", must be > 1\n");
  63                                 return -1;
  64                         }
  65                         ok++;
  66                 } else if (strcmp(*argv, "help") == 0) {
  67                         explain();
  68                         return -1;
  69                 } else {
  70                         fprintf(stderr, "What is \"%s\"?\n", *argv);
  71                         explain();
  72                         return -1;
  73                 }
  74                 argc--; argv++;
  75         }
  76
  77         if (ok)
  78                 addattr_l(n, 1024, TCA_OPTIONS, &opt, sizeof(opt));
  79         return 0;
  80 }
  81
  82 static int sfq_print_opt(struct qdisc_util *qu, FILE *f, struct rtattr *opt)
  83 {
  84         struct tc_sfq_qopt *qopt;
  85         SPRINT_BUF(b1);
  86
  87         if (opt == NULL)
  88                 return 0;
  89
  90         if (RTA_PAYLOAD(opt)  < sizeof(*qopt))
  91                 return -1;
  92         qopt = RTA_DATA(opt);
  93         fprintf(f, "limit %up ", qopt->limit);
  94         fprintf(f, "quantum %s ", sprint_size(qopt->quantum, b1));
  95         if (show_details) {
  96                 fprintf(f, "flows %u/%u ", qopt->flows, qopt->divisor);
  97         }
  98         if (qopt->perturb_period)
  99                 fprintf(f, "perturb %dsec ", qopt->perturb_period);
 100         return 0;
 101 }
 102
 103 struct qdisc_util sfq_qdisc_util = {
 104         .id             = "sfq",
 105         .parse_qopt     = sfq_parse_opt,
 106         .print_qopt     = sfq_print_opt,
 107 };