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
  37 static int drr_parse_opt(struct qdisc_util *qu, int argc, char **argv, struct nlmsghdr *n)
  38 {
  39         while (argc) {
  40                 if (strcmp(*argv, "help") == 0) {
  41                         explain();
  42                         return -1;
  43                 } else {
  44                         fprintf(stderr, "What is \"%s\"?\n", *argv);
  45                         explain();
  46                         return -1;
  47                 }
  48         }
  49         return 0;
  50 }
  51
  52 static int drr_parse_class_opt(struct qdisc_util *qu, int argc, char **argv,
  53                                struct nlmsghdr *n)
  54 {
  55         struct rtattr *tail;
  56         __u32 tmp;
  57
  58         tail = NLMSG_TAIL(n);
  59         addattr_l(n, 1024, TCA_OPTIONS, NULL, 0);
  60
  61         while (argc > 0) {
  62                 if (strcmp(*argv, "quantum") == 0) {
  63                         NEXT_ARG();
  64                         if (get_size(&tmp, *argv)) {
  65                                 fprintf(stderr, "Illegal \"quantum\"\n");
  66                                 return -1;
  67                         }
  68                         addattr_l(n, 1024, TCA_DRR_QUANTUM, &tmp, sizeof(tmp));
  69                 } else if (strcmp(*argv, "help") == 0) {
  70                         explain2();
  71                         return -1;
  72                 } else {
  73                         fprintf(stderr, "What is \"%s\"?\n", *argv);
  74                         explain2();
  75                         return -1;
  76                 }
  77                 argc--; argv++;
  78         }
  79
  80         tail->rta_len = (void *) NLMSG_TAIL(n) - (void *)tail;
  81         return 0;
  82 }
  83
  84 static int drr_print_opt(struct qdisc_util *qu, FILE *f, struct rtattr *opt)
  85 {
  86         struct rtattr *tb[TCA_DRR_MAX + 1];
  87         SPRINT_BUF(b1);
  88
  89         if (opt == NULL)
  90                 return 0;
  91
  92         parse_rtattr_nested(tb, TCA_DRR_MAX, opt);
  93
  94         if (tb[TCA_DRR_QUANTUM])
  95                 fprintf(f, "quantum %s ",
  96                         sprint_size(rta_getattr_u32(tb[TCA_DRR_QUANTUM]), b1));
  97         return 0;
  98 }
  99
 100 static int drr_print_xstats(struct qdisc_util *qu, FILE *f, struct rtattr *xstats)
 101 {
 102         struct tc_drr_stats *x;
 103         SPRINT_BUF(b1);
 104
 105         if (xstats == NULL)
 106                 return 0;
 107         if (RTA_PAYLOAD(xstats) < sizeof(*x))
 108                 return -1;
 109         x = RTA_DATA(xstats);
 110
 111         fprintf(f, " deficit %s ", sprint_size(x->deficit, b1));
 112         return 0;
 113 }
 114
 115 struct qdisc_util drr_qdisc_util = {
 116         .id             = "drr",
 117         .parse_qopt     = drr_parse_opt,
 118         .print_qopt     = drr_print_opt,
 119         .print_xstats   = drr_print_xstats,
 120         .parse_copt     = drr_parse_class_opt,
 121         .print_copt     = drr_print_opt,
 122 };