tc/f_cgroup.c

   1 /*
   2  * f_cgroup.c           Control Group Classifier
   3  *
   4  *              This program is free software; you can distribute 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:     Thomas Graf <tgraf@infradead.org>
  10  *
  11  */
  12
  13 #include <stdio.h>
  14 #include <stdlib.h>
  15 #include "utils.h"
  16 #include "tc_util.h"
  17 #include "m_ematch.h"
  18
  19 static void explain(void)
  20 {
  21         fprintf(stderr, "Usage: ... cgroup [ match EMATCH_TREE ] [ police POLICE_SPEC ]\n");
  22         fprintf(stderr, "                 [ action ACTION_SPEC ]\n");
  23 }
  24
  25 static int cgroup_parse_opt(struct filter_util *qu, char *handle,
  26                            int argc, char **argv, struct nlmsghdr *n)
  27 {
  28         struct tcmsg *t = NLMSG_DATA(n);
  29         struct rtattr *tail;
  30         long h = 0;
  31
  32         if (handle) {
  33                 h = strtol(handle, NULL, 0);
  34                 if (h == LONG_MIN || h == LONG_MAX) {
  35                         fprintf(stderr, "Illegal handle \"%s\", must be numeric.\n",
  36                             handle);
  37                         return -1;
  38                 }
  39         }
  40
  41         t->tcm_handle = h;
  42
  43         tail = (struct rtattr*)(((void*)n)+NLMSG_ALIGN(n->nlmsg_len));
  44         addattr_l(n, MAX_MSG, TCA_OPTIONS, NULL, 0);
  45
  46         while (argc > 0) {
  47                 if (matches(*argv, "match") == 0) {
  48                         NEXT_ARG();
  49                         if (parse_ematch(&argc, &argv, TCA_CGROUP_EMATCHES, n)) {
  50                                 fprintf(stderr, "Illegal \"ematch\"\n");
  51                                 return -1;
  52                         }
  53                         continue;
  54                 } else if (matches(*argv, "action") == 0) {
  55                         NEXT_ARG();
  56                         if (parse_action(&argc, &argv, TCA_CGROUP_ACT, n)) {
  57                                 fprintf(stderr, "Illegal \"action\"\n");
  58                                 return -1;
  59                         }
  60                         continue;
  61
  62                 } else if (matches(*argv, "police") == 0) {
  63                         NEXT_ARG();
  64                         if (parse_police(&argc, &argv, TCA_CGROUP_POLICE, n)) {
  65                                 fprintf(stderr, "Illegal \"police\"\n");
  66                                 return -1;
  67                         }
  68                         continue;
  69                 } else if (strcmp(*argv, "help") == 0) {
  70                         explain();
  71                         return -1;
  72                 } else {
  73                         fprintf(stderr, "What is \"%s\"?\n", *argv);
  74                         explain();
  75                         return -1;
  76                 }
  77         }
  78
  79         tail->rta_len = (((void*)n)+n->nlmsg_len) - (void*)tail;
  80         return 0;
  81 }
  82
  83 static int cgroup_print_opt(struct filter_util *qu, FILE *f,
  84                            struct rtattr *opt, __u32 handle)
  85 {
  86         struct rtattr *tb[TCA_CGROUP_MAX+1];
  87
  88         if (opt == NULL)
  89                 return 0;
  90
  91         parse_rtattr_nested(tb, TCA_CGROUP_MAX, opt);
  92
  93         if (handle)
  94                 fprintf(f, "handle 0x%x ", handle);
  95
  96         if (tb[TCA_CGROUP_EMATCHES])
  97                 print_ematch(f, tb[TCA_CGROUP_EMATCHES]);
  98
  99         if (tb[TCA_CGROUP_POLICE]) {
 100                 fprintf(f, "\n");
 101                 tc_print_police(f, tb[TCA_CGROUP_POLICE]);
 102         }
 103
 104         if (tb[TCA_CGROUP_ACT])
 105                 tc_print_action(f, tb[TCA_CGROUP_ACT]);
 106
 107         return 0;
 108 }
 109
 110 struct filter_util cgroup_filter_util = {
 111         .id = "cgroup",
 112         .parse_fopt = cgroup_parse_opt,
 113         .print_fopt = cgroup_print_opt,
 114 };