tc/f_fw.c

   1 /*
   2  * f_fw.c               FW filter.
   3  *
   4  *              This program is free software; you can redistribute 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:     Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
  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> /* IFNAMSIZ */
  23 #include "utils.h"
  24 #include "tc_util.h"
  25
  26 static void explain(void)
  27 {
  28         fprintf(stderr, "Usage: ... fw [ classid CLASSID ] [ police POLICE_SPEC ]\n");
  29         fprintf(stderr, "       POLICE_SPEC := ... look at TBF\n");
  30         fprintf(stderr, "       CLASSID := X:Y\n");
  31 }
  32
  33 #define usage() return(-1)
  34
  35 static int fw_parse_opt(struct filter_util *qu, char *handle, int argc, char **argv, struct nlmsghdr *n)
  36 {
  37         struct tc_police tp;
  38         struct tcmsg *t = NLMSG_DATA(n);
  39         struct rtattr *tail;
  40
  41         memset(&tp, 0, sizeof(tp));
  42
  43         if (handle) {
  44                 if (get_u32(&t->tcm_handle, handle, 0)) {
  45                         fprintf(stderr, "Illegal \"handle\"\n");
  46                         return -1;
  47                 }
  48         }
  49
  50         if (argc == 0)
  51                 return 0;
  52
  53         tail = NLMSG_TAIL(n);
  54         addattr_l(n, 4096, TCA_OPTIONS, NULL, 0);
  55
  56         while (argc > 0) {
  57                 if (matches(*argv, "classid") == 0 ||
  58                     matches(*argv, "flowid") == 0) {
  59                         unsigned handle;
  60                         NEXT_ARG();
  61                         if (get_tc_classid(&handle, *argv)) {
  62                                 fprintf(stderr, "Illegal \"classid\"\n");
  63                                 return -1;
  64                         }
  65                         addattr_l(n, 4096, TCA_FW_CLASSID, &handle, 4);
  66                 } else if (matches(*argv, "police") == 0) {
  67                         NEXT_ARG();
  68                         if (parse_police(&argc, &argv, TCA_FW_POLICE, n)) {
  69                                 fprintf(stderr, "Illegal \"police\"\n");
  70                                 return -1;
  71                         }
  72                         continue;
  73                 } else if (matches(*argv, "action") == 0) {
  74                         NEXT_ARG();
  75                         if (parse_action(&argc, &argv, TCA_FW_ACT, n)) {
  76                                 fprintf(stderr, "Illegal fw \"action\"\n");
  77                                 return -1;
  78                         }
  79                         continue;
  80                 } else if (strcmp(*argv, "indev") == 0) {
  81                         char d[IFNAMSIZ+1];
  82                         memset(d, 0, sizeof (d));
  83                         argc--;
  84                         argv++;
  85                         if (argc < 1) {
  86                                 fprintf(stderr, "Illegal indev\n");
  87                                 return -1;
  88                         }
  89                         strncpy(d, *argv, sizeof (d) - 1);
  90                         addattr_l(n, MAX_MSG, TCA_FW_INDEV, d, strlen(d) + 1);
  91                 } else if (strcmp(*argv, "help") == 0) {
  92                         explain();
  93                         return -1;
  94                 } else {
  95                         fprintf(stderr, "What is \"%s\"?\n", *argv);
  96                         explain();
  97                         return -1;
  98                 }
  99                 argc--; argv++;
 100         }
 101         tail->rta_len = (void *) NLMSG_TAIL(n) - (void *) tail;
 102         return 0;
 103 }
 104
 105 static int fw_print_opt(struct filter_util *qu, FILE *f, struct rtattr *opt, __u32 handle)
 106 {
 107         struct rtattr *tb[TCA_FW_MAX+1];
 108
 109         if (opt == NULL)
 110                 return 0;
 111
 112         parse_rtattr_nested(tb, TCA_FW_MAX, opt);
 113
 114         if (handle)
 115                 fprintf(f, "handle 0x%x ", handle);
 116
 117         if (tb[TCA_FW_CLASSID]) {
 118                 SPRINT_BUF(b1);
 119                 fprintf(f, "classid %s ", sprint_tc_classid(*(__u32*)RTA_DATA(tb[TCA_FW_CLASSID]), b1));
 120         }
 121
 122         if (tb[TCA_FW_POLICE])
 123                 tc_print_police(f, tb[TCA_FW_POLICE]);
 124         if (tb[TCA_FW_INDEV]) {
 125                 struct rtattr *idev = tb[TCA_FW_INDEV];
 126                 fprintf(f, "input dev %s ",(char *)RTA_DATA(idev));
 127         }
 128
 129         if (tb[TCA_FW_ACT]) {
 130                 fprintf(f, "\n");
 131                 tc_print_action(f, tb[TCA_FW_ACT]);
 132         }
 133         return 0;
 134 }
 135
 136 struct filter_util fw_filter_util = {
 137         .id = "fw",
 138         .parse_fopt = fw_parse_opt,
 139         .print_fopt = fw_print_opt,
 140 };