tc/f_basic.c

   1 /*
   2  * f_basic.c            Basic Classifier
   3  *
   4  *              This program is free software; you can u32istribute 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@suug.ch>
  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 #include <linux/if.h>
  23
  24 #include "utils.h"
  25 #include "tc_util.h"
  26 #include "m_ematch.h"
  27
  28 static void explain(void)
  29 {
  30         fprintf(stderr, "Usage: ... basic [ match EMATCH_TREE ] [ police POLICE_SPEC ]\n");
  31         fprintf(stderr, "                 [ action ACTION_SPEC ] [ classid CLASSID ]\n");
  32         fprintf(stderr, "\n");
  33         fprintf(stderr, "Where: SELECTOR := SAMPLE SAMPLE ...\n");
  34         fprintf(stderr, "       FILTERID := X:Y:Z\n");
  35 }
  36
  37 static int basic_parse_opt(struct filter_util *qu, char *handle,
  38                            int argc, char **argv, struct nlmsghdr *n)
  39 {
  40         struct tcmsg *t = NLMSG_DATA(n);
  41         struct rtattr *tail;
  42         long h = 0;
  43
  44         if (argc == 0)
  45                 return 0;
  46
  47         if (handle) {
  48                 h = strtol(handle, NULL, 0);
  49                 if (h == LONG_MIN || h == LONG_MAX) {
  50                         fprintf(stderr, "Illegal handle \"%s\", must be numeric.\n",
  51                             handle);
  52                         return -1;
  53                 }
  54         }
  55
  56         t->tcm_handle = h;
  57
  58         tail = (struct rtattr*)(((void*)n)+NLMSG_ALIGN(n->nlmsg_len));
  59         addattr_l(n, MAX_MSG, TCA_OPTIONS, NULL, 0);
  60
  61         while (argc > 0) {
  62                 if (matches(*argv, "match") == 0) {
  63                         NEXT_ARG();
  64                         if (parse_ematch(&argc, &argv, TCA_BASIC_EMATCHES, n)) {
  65                                 fprintf(stderr, "Illegal \"ematch\"\n");
  66                                 return -1;
  67                         }
  68                         continue;
  69                 } else if (matches(*argv, "classid") == 0 ||
  70                            strcmp(*argv, "flowid") == 0) {
  71                         unsigned handle;
  72                         NEXT_ARG();
  73                         if (get_tc_classid(&handle, *argv)) {
  74                                 fprintf(stderr, "Illegal \"classid\"\n");
  75                                 return -1;
  76                         }
  77                         addattr_l(n, MAX_MSG, TCA_BASIC_CLASSID, &handle, 4);
  78                 } else if (matches(*argv, "action") == 0) {
  79                         NEXT_ARG();
  80                         if (parse_action(&argc, &argv, TCA_BASIC_ACT, n)) {
  81                                 fprintf(stderr, "Illegal \"action\"\n");
  82                                 return -1;
  83                         }
  84                         continue;
  85
  86                 } else if (matches(*argv, "police") == 0) {
  87                         NEXT_ARG();
  88                         if (parse_police(&argc, &argv, TCA_BASIC_POLICE, n)) {
  89                                 fprintf(stderr, "Illegal \"police\"\n");
  90                                 return -1;
  91                         }
  92                         continue;
  93                 } else if (strcmp(*argv, "help") == 0) {
  94                         explain();
  95                         return -1;
  96                 } else {
  97                         fprintf(stderr, "What is \"%s\"?\n", *argv);
  98                         explain();
  99                         return -1;
 100                 }
 101                 argc--; argv++;
 102         }
 103
 104         tail->rta_len = (((void*)n)+n->nlmsg_len) - (void*)tail;
 105         return 0;
 106 }
 107
 108 static int basic_print_opt(struct filter_util *qu, FILE *f,
 109                            struct rtattr *opt, __u32 handle)
 110 {
 111         struct rtattr *tb[TCA_BASIC_MAX+1];
 112
 113         if (opt == NULL)
 114                 return 0;
 115
 116         parse_rtattr_nested(tb, TCA_BASIC_MAX, opt);
 117
 118         if (handle)
 119                 fprintf(f, "handle 0x%x ", handle);
 120
 121         if (tb[TCA_BASIC_CLASSID]) {
 122                 SPRINT_BUF(b1);
 123                 fprintf(f, "flowid %s ",
 124                         sprint_tc_classid(*(__u32*)RTA_DATA(tb[TCA_BASIC_CLASSID]), b1));
 125         }
 126
 127         if (tb[TCA_BASIC_EMATCHES])
 128                 print_ematch(f, tb[TCA_BASIC_EMATCHES]);
 129
 130         if (tb[TCA_BASIC_POLICE]) {
 131                 fprintf(f, "\n");
 132                 tc_print_police(f, tb[TCA_BASIC_POLICE]);
 133         }
 134
 135         if (tb[TCA_BASIC_ACT]) {
 136                 tc_print_action(f, tb[TCA_BASIC_ACT]);
 137         }
 138
 139         return 0;
 140 }
 141
 142 struct filter_util basic_filter_util = {
 143         .id = "basic",
 144         .parse_fopt = basic_parse_opt,
 145         .print_fopt = basic_print_opt,
 146 };