tc/p_tcp.c

   1 /*
   2  * m_pedit_tcp.c        packet editor: TCP header
   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:  J Hadi Salim (hadi@cyberus.ca)
  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 "utils.h"
  22 #include "tc_util.h"
  23 #include "m_pedit.h"
  24
  25 static int
  26 parse_tcp(int *argc_p, char ***argv_p,
  27           struct m_pedit_sel *sel, struct m_pedit_key *tkey)
  28 {
  29         int res = -1;
  30         int argc = *argc_p;
  31         char **argv = *argv_p;
  32
  33         if (argc < 2)
  34                 return -1;
  35
  36         if (!sel->extended)
  37                 return -1;
  38
  39         tkey->htype = TCA_PEDIT_KEY_EX_HDR_TYPE_TCP;
  40
  41         if (strcmp(*argv, "sport") == 0) {
  42                 NEXT_ARG();
  43                 tkey->off = 0;
  44                 res = parse_cmd(&argc, &argv, 2, TU32, RU16, sel, tkey);
  45                 goto done;
  46         }
  47
  48         if (strcmp(*argv, "dport") == 0) {
  49                 NEXT_ARG();
  50                 tkey->off = 2;
  51                 res = parse_cmd(&argc, &argv, 2, TU32, RU16, sel, tkey);
  52                 goto done;
  53         }
  54
  55         if (strcmp(*argv, "flags") == 0) {
  56                 NEXT_ARG();
  57                 tkey->off = 13;
  58                 res = parse_cmd(&argc, &argv, 1, TU32, RU8, sel, tkey);
  59                 goto done;
  60         }
  61
  62         return -1;
  63
  64 done:
  65         *argc_p = argc;
  66         *argv_p = argv;
  67         return res;
  68 }
  69 struct m_pedit_util p_pedit_tcp = {
  70         .id = "tcp",
  71         .parse_peopt = parse_tcp,
  72 };