tc/q_drr.c

   1 /*
   2  * q_drr.c              DRR.
   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:     Patrick McHardy <kaber@trash.net>
  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: ... drr\n");
  29 }
  30
  31 static void explain2(void)
  32 {
  33         fprintf(stderr, "Usage: ... drr quantum SIZE\n");
  34 }
  35
  36 #define usage() return(-1)
  37
  38 static int drr_parse_opt(struct qdisc_util *qu, int argc, char **argv, struct nlmsghdr *n)
  39 {
  40         while (argc > 0) {
  41                 if (strcmp(*argv, "help") == 0) {
  42                         explain();
  43                         return -1;
  44                 } else {
  45                         fprintf(stderr, "What is \"%s\"?\n", *argv);
  46                         explain();
  47                         return -1;
  48                 }
  49                 argc--; argv++;
  50         }
  51         return 0;
  52 }
  53
  54 static int drr_parse_class_opt(struct qdisc_util *qu, int argc, char **argv,
  55                                struct nlmsghdr *n)
  56 {
  57         struct rtattr *tail;
  58         __u32 tmp;
  59
  60         tail = NLMSG_TAIL(n);
  61         addattr_l(n, 1024, TCA_OPTIONS, NULL, 0);
  62
  63         while (argc > 0) {
  64                 if (strcmp(*argv, "quantum") == 0) {
  65                         NEXT_ARG();
  66                         if (get_size(&tmp, *argv)) {
  67                                 fprintf(stderr, "Illegal \"quantum\"\n");
  68                                 return -1;
  69                         }
  70                         addattr_l(n, 1024, TCA_DRR_QUANTUM, &tmp, sizeof(tmp));
  71                 } else if (strcmp(*argv, "help") == 0) {
  72                         explain2();
  73                         return -1;
  74                 } else {
  75                         fprintf(stderr, "What is \"%s\"?\n", *argv);
  76                         explain2();
  77                         return -1;
  78                 }
  79                 argc--; argv++;
  80         }
  81
  82         tail->rta_len = (void *) NLMSG_TAIL(n) - (void *)tail;
  83         return 0;
  84 }
  85
  86 static int drr_print_opt(struct qdisc_util *qu, FILE *f, struct rtattr *opt)
  87 {
  88         struct rtattr *tb[TCA_DRR_MAX + 1];
  89         SPRINT_BUF(b1);
  90
  91         if (opt == NULL)
  92                 return 0;
  93
  94         parse_rtattr_nested(tb, TCA_DRR_MAX, opt);
  95
  96         if (tb[TCA_DRR_QUANTUM])
  97                 fprintf(f, "quantum %s ",
  98                         sprint_size(*(__u32 *)RTA_DATA(tb[TCA_DRR_QUANTUM]), b1));
  99         return 0;
 100 }
 101
 102 static int drr_print_xstats(struct qdisc_util *qu, FILE *f, struct rtattr *xstats)
 103 {
 104         struct tc_drr_stats *x;
 105         SPRINT_BUF(b1);
 106
 107         if (xstats == NULL)
 108                 return 0;
 109         if (RTA_PAYLOAD(xstats) < sizeof(*x))
 110                 return -1;
 111         x = RTA_DATA(xstats);
 112
 113         fprintf(f, " deficit %s ", sprint_size(x->deficit, b1));
 114         return 0;
 115 }
 116
 117 struct qdisc_util drr_qdisc_util = {
 118         .id             = "drr",
 119         .parse_qopt     = drr_parse_opt,
 120         .print_qopt     = drr_print_opt,
 121         .print_xstats   = drr_print_xstats,
 122         .parse_copt     = drr_parse_class_opt,
 123         .print_copt     = drr_print_opt,
 124 };