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         fprintf(stderr, "               [ divisor NUMBER ]\n");
  30 }
  31
  32 static int sfq_parse_opt(struct qdisc_util *qu, int argc, char **argv, struct nlmsghdr *n)
  33 {
  34         int ok=0;
  35         struct tc_sfq_qopt opt;
  36
  37         memset(&opt, 0, sizeof(opt));
  38
  39         while (argc > 0) {
  40                 if (strcmp(*argv, "quantum") == 0) {
  41                         NEXT_ARG();
  42                         if (get_size(&opt.quantum, *argv)) {
  43                                 fprintf(stderr, "Illegal \"limit\"\n");
  44                                 return -1;
  45                         }
  46                         ok++;
  47                 } else if (strcmp(*argv, "perturb") == 0) {
  48                         NEXT_ARG();
  49                         if (get_integer(&opt.perturb_period, *argv, 0)) {
  50                                 fprintf(stderr, "Illegal \"perturb\"\n");
  51                                 return -1;
  52                         }
  53                         ok++;
  54                 } else if (strcmp(*argv, "limit") == 0) {
  55                         NEXT_ARG();
  56                         if (get_u32(&opt.limit, *argv, 0)) {
  57                                 fprintf(stderr, "Illegal \"limit\"\n");
  58                                 return -1;
  59                         }
  60                         if (opt.limit < 2) {
  61                                 fprintf(stderr, "Illegal \"limit\", must be > 1\n");
  62                                 return -1;
  63                         }
  64                         ok++;
  65                 } else if (strcmp(*argv, "divisor") == 0) {
  66                         NEXT_ARG();
  67                         if (get_u32(&opt.divisor, *argv, 0)) {
  68                                 fprintf(stderr, "Illegal \"divisor\"\n");
  69                                 return -1;
  70                         }
  71                         ok++;
  72                 } else if (strcmp(*argv, "help") == 0) {
  73                         explain();
  74                         return -1;
  75                 } else {
  76                         fprintf(stderr, "What is \"%s\"?\n", *argv);
  77                         explain();
  78                         return -1;
  79                 }
  80                 argc--; argv++;
  81         }
  82
  83         if (ok)
  84                 addattr_l(n, 1024, TCA_OPTIONS, &opt, sizeof(opt));
  85         return 0;
  86 }
  87
  88 static int sfq_print_opt(struct qdisc_util *qu, FILE *f, struct rtattr *opt)
  89 {
  90         struct tc_sfq_qopt *qopt;
  91         SPRINT_BUF(b1);
  92
  93         if (opt == NULL)
  94                 return 0;
  95
  96         if (RTA_PAYLOAD(opt)  < sizeof(*qopt))
  97                 return -1;
  98         qopt = RTA_DATA(opt);
  99         fprintf(f, "limit %up ", qopt->limit);
 100         fprintf(f, "quantum %s ", sprint_size(qopt->quantum, b1));
 101         if (show_details) {
 102                 fprintf(f, "flows %u/%u ", qopt->flows, qopt->divisor);
 103         }
 104         fprintf(f, "divisor %u ", qopt->divisor);
 105         if (qopt->perturb_period)
 106                 fprintf(f, "perturb %dsec ", qopt->perturb_period);
 107         return 0;
 108 }
 109
 110 static int sfq_print_xstats(struct qdisc_util *qu, FILE *f,
 111                             struct rtattr *xstats)
 112 {
 113         struct tc_sfq_xstats *st;
 114
 115         if (xstats == NULL)
 116                 return 0;
 117         if (RTA_PAYLOAD(xstats) < sizeof(*st))
 118                 return -1;
 119         st = RTA_DATA(xstats);
 120
 121         fprintf(f, " allot %d ", st->allot);
 122         fprintf(f, "\n");
 123         return 0;
 124 }
 125
 126 struct qdisc_util sfq_qdisc_util = {
 127         .id             = "sfq",
 128         .parse_qopt     = sfq_parse_opt,
 129         .print_qopt     = sfq_print_opt,
 130         .print_xstats   = sfq_print_xstats,
 131 };