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 ]\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, "       ACTION_SPEC := ... look at individual actions\n");
  36         fprintf(stderr, "\nNOTE: CLASSID is parsed as hexadecimal input.\n");
  37 }
  38
  39 static int basic_parse_opt(struct filter_util *qu, char *handle,
  40                            int argc, char **argv, struct nlmsghdr *n)
  41 {
  42         struct tcmsg *t = NLMSG_DATA(n);
  43         struct rtattr *tail;
  44         long h = 0;
  45
  46         if (handle) {
  47                 h = strtol(handle, NULL, 0);
  48                 if (h == LONG_MIN || h == LONG_MAX) {
  49                         fprintf(stderr, "Illegal handle \"%s\", must be numeric.\n",
  50                             handle);
  51                         return -1;
  52                 }
  53         }
  54         t->tcm_handle = h;
  55
  56         if (argc == 0)
  57                 return 0;
  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 int handle;
  73
  74                         NEXT_ARG();
  75                         if (get_tc_classid(&handle, *argv)) {
  76                                 fprintf(stderr, "Illegal \"classid\"\n");
  77                                 return -1;
  78                         }
  79                         addattr_l(n, MAX_MSG, TCA_BASIC_CLASSID, &handle, 4);
  80                 } else if (matches(*argv, "action") == 0) {
  81                         NEXT_ARG();
  82                         if (parse_action(&argc, &argv, TCA_BASIC_ACT, n)) {
  83                                 fprintf(stderr, "Illegal \"action\"\n");
  84                                 return -1;
  85                         }
  86                         continue;
  87
  88                 } else if (matches(*argv, "police") == 0) {
  89                         NEXT_ARG();
  90                         if (parse_police(&argc, &argv, TCA_BASIC_POLICE, n)) {
  91                                 fprintf(stderr, "Illegal \"police\"\n");
  92                                 return -1;
  93                         }
  94                         continue;
  95                 } else if (strcmp(*argv, "help") == 0) {
  96                         explain();
  97                         return -1;
  98                 } else {
  99                         fprintf(stderr, "What is \"%s\"?\n", *argv);
 100                         explain();
 101                         return -1;
 102                 }
 103                 argc--; argv++;
 104         }
 105
 106         tail->rta_len = (((void *)n)+n->nlmsg_len) - (void *)tail;
 107         return 0;
 108 }
 109
 110 static int basic_print_opt(struct filter_util *qu, FILE *f,
 111                            struct rtattr *opt, __u32 handle)
 112 {
 113         struct rtattr *tb[TCA_BASIC_MAX+1];
 114
 115         if (opt == NULL)
 116                 return 0;
 117
 118         parse_rtattr_nested(tb, TCA_BASIC_MAX, opt);
 119
 120         if (handle)
 121                 fprintf(f, "handle 0x%x ", handle);
 122
 123         if (tb[TCA_BASIC_CLASSID]) {
 124                 SPRINT_BUF(b1);
 125                 fprintf(f, "flowid %s ",
 126                         sprint_tc_classid(rta_getattr_u32(tb[TCA_BASIC_CLASSID]), b1));
 127         }
 128
 129         if (tb[TCA_BASIC_EMATCHES])
 130                 print_ematch(f, tb[TCA_BASIC_EMATCHES]);
 131
 132         if (tb[TCA_BASIC_POLICE]) {
 133                 fprintf(f, "\n");
 134                 tc_print_police(f, tb[TCA_BASIC_POLICE]);
 135         }
 136
 137         if (tb[TCA_BASIC_ACT]) {
 138                 tc_print_action(f, tb[TCA_BASIC_ACT], 0);
 139         }
 140
 141         return 0;
 142 }
 143
 144 struct filter_util basic_filter_util = {
 145         .id = "basic",
 146         .parse_fopt = basic_parse_opt,
 147         .print_fopt = basic_print_opt,
 148 };