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 <fcntl.h>
  17 #include <sys/socket.h>
  18 #include <netinet/in.h>
  19 #include <arpa/inet.h>
  20 #include <string.h>
  21
  22 #include "utils.h"
  23 #include "tc_util.h"
  24
  25 static void explain(void)
  26 {
  27         fprintf(stderr, "Usage: ... drr\n");
  28 }
  29
  30 static void explain2(void)
  31 {
  32         fprintf(stderr, "Usage: ... drr quantum SIZE\n");
  33 }
  34
  35
  36 static int drr_parse_opt(struct qdisc_util *qu, int argc, char **argv, struct nlmsghdr *n, const char *dev)
  37 {
  38         while (argc) {
  39                 if (strcmp(*argv, "help") == 0) {
  40                         explain();
  41                         return -1;
  42                 } else {
  43                         fprintf(stderr, "What is \"%s\"?\n", *argv);
  44                         explain();
  45                         return -1;
  46                 }
  47         }
  48         return 0;
  49 }
  50
  51 static int drr_parse_class_opt(struct qdisc_util *qu, int argc, char **argv,
  52                                struct nlmsghdr *n, const char *dev)
  53 {
  54         struct rtattr *tail;
  55         __u32 tmp;
  56
  57         tail = NLMSG_TAIL(n);
  58         addattr_l(n, 1024, TCA_OPTIONS, NULL, 0);
  59
  60         while (argc > 0) {
  61                 if (strcmp(*argv, "quantum") == 0) {
  62                         NEXT_ARG();
  63                         if (get_size(&tmp, *argv)) {
  64                                 fprintf(stderr, "Illegal \"quantum\"\n");
  65                                 return -1;
  66                         }
  67                         addattr_l(n, 1024, TCA_DRR_QUANTUM, &tmp, sizeof(tmp));
  68                 } else if (strcmp(*argv, "help") == 0) {
  69                         explain2();
  70                         return -1;
  71                 } else {
  72                         fprintf(stderr, "What is \"%s\"?\n", *argv);
  73                         explain2();
  74                         return -1;
  75                 }
  76                 argc--; argv++;
  77         }
  78
  79         tail->rta_len = (void *) NLMSG_TAIL(n) - (void *)tail;
  80         return 0;
  81 }
  82
  83 static int drr_print_opt(struct qdisc_util *qu, FILE *f, struct rtattr *opt)
  84 {
  85         struct rtattr *tb[TCA_DRR_MAX + 1];
  86
  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
 104         SPRINT_BUF(b1);
 105
 106         if (xstats == NULL)
 107                 return 0;
 108         if (RTA_PAYLOAD(xstats) < sizeof(*x))
 109                 return -1;
 110         x = RTA_DATA(xstats);
 111
 112         fprintf(f, " deficit %s ", sprint_size(x->deficit, b1));
 113         return 0;
 114 }
 115
 116 struct qdisc_util drr_qdisc_util = {
 117         .id             = "drr",
 118         .parse_qopt     = drr_parse_opt,
 119         .print_qopt     = drr_print_opt,
 120         .print_xstats   = drr_print_xstats,
 121         .parse_copt     = drr_parse_class_opt,
 122         .print_copt     = drr_print_opt,
 123 };