tc/f_basic.c

   1 /*
   2  * f_basic.c            Basic 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@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         fprintf(stderr, "\nNOTE: CLASSID is parsed as hexadecimal input.\n");
  36 }
  37
  38 static int basic_parse_opt(struct filter_util *qu, char *handle,
  39                            int argc, char **argv, struct nlmsghdr *n)
  40 {
  41         struct tcmsg *t = NLMSG_DATA(n);
  42         struct rtattr *tail;
  43         long h = 0;
  44
  45         if (argc == 0)
  46                 return 0;
  47
  48         if (handle) {
  49                 h = strtol(handle, NULL, 0);
  50                 if (h == LONG_MIN || h == LONG_MAX) {
  51                         fprintf(stderr, "Illegal handle \"%s\", must be numeric.\n",
  52                             handle);
  53                         return -1;
  54                 }
  55         }
  56
  57         t->tcm_handle = h;
  58
  59         tail = (struct rtattr*)(((void*)n)+NLMSG_ALIGN(n->nlmsg_len));
  60         addattr_l(n, MAX_MSG, TCA_OPTIONS, NULL, 0);
  61
  62         while (argc > 0) {
  63                 if (matches(*argv, "match") == 0) {
  64                         NEXT_ARG();
  65                         if (parse_ematch(&argc, &argv, TCA_BASIC_EMATCHES, n)) {
  66                                 fprintf(stderr, "Illegal \"ematch\"\n");
  67                                 return -1;
  68                         }
  69                         continue;
  70                 } else if (matches(*argv, "classid") == 0 ||
  71                            strcmp(*argv, "flowid") == 0) {
  72                         unsigned handle;
  73                         NEXT_ARG();
  74                         if (get_tc_classid(&handle, *argv)) {
  75                                 fprintf(stderr, "Illegal \"classid\"\n");
  76                                 return -1;
  77                         }
  78                         addattr_l(n, MAX_MSG, TCA_BASIC_CLASSID, &handle, 4);
  79                 } else if (matches(*argv, "action") == 0) {
  80                         NEXT_ARG();
  81                         if (parse_action(&argc, &argv, TCA_BASIC_ACT, n)) {
  82                                 fprintf(stderr, "Illegal \"action\"\n");
  83                                 return -1;
  84                         }
  85                         continue;
  86
  87                 } else if (matches(*argv, "police") == 0) {
  88                         NEXT_ARG();
  89                         if (parse_police(&argc, &argv, TCA_BASIC_POLICE, n)) {
  90                                 fprintf(stderr, "Illegal \"police\"\n");
  91                                 return -1;
  92                         }
  93                         continue;
  94                 } else if (strcmp(*argv, "help") == 0) {
  95                         explain();
  96                         return -1;
  97                 } else {
  98                         fprintf(stderr, "What is \"%s\"?\n", *argv);
  99                         explain();
 100                         return -1;
 101                 }
 102                 argc--; argv++;
 103         }
 104
 105         tail->rta_len = (((void*)n)+n->nlmsg_len) - (void*)tail;
 106         return 0;
 107 }
 108
 109 static int basic_print_opt(struct filter_util *qu, FILE *f,
 110                            struct rtattr *opt, __u32 handle)
 111 {
 112         struct rtattr *tb[TCA_BASIC_MAX+1];
 113
 114         if (opt == NULL)
 115                 return 0;
 116
 117         parse_rtattr_nested(tb, TCA_BASIC_MAX, opt);
 118
 119         if (handle)
 120                 fprintf(f, "handle 0x%x ", handle);
 121
 122         if (tb[TCA_BASIC_CLASSID]) {
 123                 SPRINT_BUF(b1);
 124                 fprintf(f, "flowid %s ",
 125                         sprint_tc_classid(rta_getattr_u32(tb[TCA_BASIC_CLASSID]), b1));
 126         }
 127
 128         if (tb[TCA_BASIC_EMATCHES])
 129                 print_ematch(f, tb[TCA_BASIC_EMATCHES]);
 130
 131         if (tb[TCA_BASIC_POLICE]) {
 132                 fprintf(f, "\n");
 133                 tc_print_police(f, tb[TCA_BASIC_POLICE]);
 134         }
 135
 136         if (tb[TCA_BASIC_ACT]) {
 137                 tc_print_action(f, tb[TCA_BASIC_ACT]);
 138         }
 139
 140         return 0;
 141 }
 142
 143 struct filter_util basic_filter_util = {
 144         .id = "basic",
 145         .parse_fopt = basic_parse_opt,
 146         .print_fopt = basic_print_opt,
 147 };