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 <fcntl.h>
  17 #include <sys/socket.h>
  18 #include <netinet/in.h>
  19 #include <arpa/inet.h>
  20 #include <string.h>
  21 #include <linux/if.h>
  22
  23 #include "utils.h"
  24 #include "tc_util.h"
  25 #include "m_ematch.h"
  26
  27 static void explain(void)
  28 {
  29         fprintf(stderr,
  30                 "Usage: ... basic [ match EMATCH_TREE ]\n"
  31                 "                 [ action ACTION_SPEC ] [ classid CLASSID ]\n"
  32                 "\n"
  33                 "Where: SELECTOR := SAMPLE SAMPLE ...\n"
  34                 "       FILTERID := X:Y:Z\n"
  35                 "       ACTION_SPEC := ... look at individual actions\n"
  36                 "\n"
  37                 "NOTE: CLASSID is parsed as hexadecimal input.\n");
  38 }
  39
  40 static int basic_parse_opt(struct filter_util *qu, char *handle,
  41                            int argc, char **argv, struct nlmsghdr *n)
  42 {
  43         struct tcmsg *t = NLMSG_DATA(n);
  44         struct rtattr *tail;
  45         long h = 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         t->tcm_handle = h;
  56
  57         if (argc == 0)
  58                 return 0;
  59
  60         tail = (struct rtattr *)(((void *)n)+NLMSG_ALIGN(n->nlmsg_len));
  61         addattr_l(n, MAX_MSG, TCA_OPTIONS, NULL, 0);
  62
  63         while (argc > 0) {
  64                 if (matches(*argv, "match") == 0) {
  65                         NEXT_ARG();
  66                         if (parse_ematch(&argc, &argv, TCA_BASIC_EMATCHES, n)) {
  67                                 fprintf(stderr, "Illegal \"ematch\"\n");
  68                                 return -1;
  69                         }
  70                         continue;
  71                 } else if (matches(*argv, "classid") == 0 ||
  72                            strcmp(*argv, "flowid") == 0) {
  73                         unsigned int handle;
  74
  75                         NEXT_ARG();
  76                         if (get_tc_classid(&handle, *argv)) {
  77                                 fprintf(stderr, "Illegal \"classid\"\n");
  78                                 return -1;
  79                         }
  80                         addattr_l(n, MAX_MSG, TCA_BASIC_CLASSID, &handle, 4);
  81                 } else if (matches(*argv, "action") == 0) {
  82                         NEXT_ARG();
  83                         if (parse_action(&argc, &argv, TCA_BASIC_ACT, n)) {
  84                                 fprintf(stderr, "Illegal \"action\"\n");
  85                                 return -1;
  86                         }
  87                         continue;
  88
  89                 } else if (matches(*argv, "police") == 0) {
  90                         NEXT_ARG();
  91                         if (parse_police(&argc, &argv, TCA_BASIC_POLICE, n)) {
  92                                 fprintf(stderr, "Illegal \"police\"\n");
  93                                 return -1;
  94                         }
  95                         continue;
  96                 } else if (strcmp(*argv, "help") == 0) {
  97                         explain();
  98                         return -1;
  99                 } else {
 100                         fprintf(stderr, "What is \"%s\"?\n", *argv);
 101                         explain();
 102                         return -1;
 103                 }
 104                 argc--; argv++;
 105         }
 106
 107         tail->rta_len = (((void *)n)+n->nlmsg_len) - (void *)tail;
 108         return 0;
 109 }
 110
 111 static int basic_print_opt(struct filter_util *qu, FILE *f,
 112                            struct rtattr *opt, __u32 handle)
 113 {
 114         struct rtattr *tb[TCA_BASIC_MAX+1];
 115
 116         if (opt == NULL)
 117                 return 0;
 118
 119         parse_rtattr_nested(tb, TCA_BASIC_MAX, opt);
 120
 121         if (handle)
 122                 fprintf(f, "handle 0x%x ", handle);
 123
 124         if (tb[TCA_BASIC_CLASSID]) {
 125                 SPRINT_BUF(b1);
 126                 fprintf(f, "flowid %s ",
 127                         sprint_tc_classid(rta_getattr_u32(tb[TCA_BASIC_CLASSID]), b1));
 128         }
 129
 130         if (tb[TCA_BASIC_EMATCHES])
 131                 print_ematch(f, tb[TCA_BASIC_EMATCHES]);
 132
 133         if (tb[TCA_BASIC_POLICE]) {
 134                 fprintf(f, "\n");
 135                 tc_print_police(f, tb[TCA_BASIC_POLICE]);
 136         }
 137
 138         if (tb[TCA_BASIC_ACT]) {
 139                 tc_print_action(f, tb[TCA_BASIC_ACT], 0);
 140         }
 141
 142         return 0;
 143 }
 144
 145 struct filter_util basic_filter_util = {
 146         .id = "basic",
 147         .parse_fopt = basic_parse_opt,
 148         .print_fopt = basic_print_opt,
 149 };