tc/q_rlim.c

   1 /*
   2  * q_rtlim.c            RTLIM.
   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,
  29                 "Usage: ... rlim limit PACKETS rate KBPS [ overhead BYTES ]\n");
  30 }
  31
  32 static void explain1(char *arg)
  33 {
  34         fprintf(stderr, "Illegal \"%s\"\n", arg);
  35 }
  36
  37
  38 #define usage() return(-1)
  39
  40 static int rlim_parse_opt(struct qdisc_util *qu, int argc, char **argv, struct nlmsghdr *n)
  41 {
  42         unsigned x;
  43         struct tc_rlim_qopt opt = {
  44                 .overhead = 24,         /* Ether IPG + Preamble + CRC */
  45         };
  46         struct rtattr *tail;
  47
  48         while (argc > 0) {
  49                 if (matches(*argv, "limit") == 0) {
  50                         NEXT_ARG();
  51                         if (opt.limit) {
  52                                 fprintf(stderr, "Double \"limit\" spec\n");
  53                                 return -1;
  54                         }
  55                         if (get_size(&opt.limit, *argv)) {
  56                                 explain1("limit");
  57                                 return -1;
  58                         }
  59                 } else if (strcmp(*argv, "rate") == 0) {
  60                         NEXT_ARG();
  61                         if (opt.rate) {
  62                                 fprintf(stderr, "Double \"rate\" spec\n");
  63                                 return -1;
  64                         }
  65
  66                         if (get_rate(&x, *argv)) {
  67                                 explain1("rate");
  68                                 return -1;
  69                         }
  70                         opt.rate = x;
  71                 } else if (strcmp(*argv, "help") == 0) {
  72                         explain();
  73                         return -1;
  74                 } else {
  75                         fprintf(stderr, "What is \"%s\"?\n", *argv);
  76                         explain();
  77                         return -1;
  78                 }
  79                 argc--; argv++;
  80         }
  81
  82         if (opt.rate == 0) {
  83                 fprintf(stderr, "\"rate\" is required.\n");
  84                 return -1;
  85         }
  86
  87         if (opt.limit == 0)
  88                 opt.limit = 1000;
  89
  90         tail = NLMSG_TAIL(n);
  91         addattr_l(n, 1024, TCA_OPTIONS, NULL, 0);
  92         addattr_l(n, 2024, TCA_RLIM_PARMS, &opt, sizeof(opt));
  93         tail->rta_len = (void *) NLMSG_TAIL(n) - (void *) tail;
  94
  95         return 0;
  96 }
  97
  98 static int rlim_print_opt(struct qdisc_util *qu, FILE *f, struct rtattr *opt)
  99 {
 100         struct rtattr *tb[TCA_RLIM_PARMS+1];
 101         struct tc_rlim_qopt *qopt;
 102         SPRINT_BUF(b1);
 103         SPRINT_BUF(b2);
 104
 105         if (opt == NULL)
 106                 return 0;
 107
 108         parse_rtattr_nested(tb, TCA_RLIM_PARMS, opt);
 109         if (tb[TCA_RLIM_PARMS] == NULL)
 110                 return -1;
 111
 112         qopt = RTA_DATA(tb[TCA_RLIM_PARMS]);
 113         if (RTA_PAYLOAD(tb[TCA_RLIM_PARMS])  < sizeof(*qopt))
 114                 return -1;
 115
 116         fprintf(f, "limit %s rate %s overhead %u",
 117                 sprint_size(qopt->limit, b1),
 118                 sprint_rate(qopt->rate, b2),
 119                 qopt->overhead);
 120
 121         return 0;
 122 }
 123
 124 struct qdisc_util rlim_qdisc_util = {
 125         .id             = "rlim",
 126         .parse_qopt     = rlim_parse_opt,
 127         .print_qopt     = rlim_print_opt,
 128 };
 129