tc/m_connmark.c

   1 /*
   2  * m_connmark.c         Connection tracking marking import
   3  *
   4  * Copyright (c) 2011 Felix Fietkau <nbd@openwrt.org>
   5  *
   6  * This program is free software; you can redistribute it and/or modify it
   7  * under the terms and conditions of the GNU General Public License,
   8  * version 2, as published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope it will be useful, but WITHOUT
  11  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  12  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  13  * more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along with
  16  * this program; if not, see <http://www.gnu.org/licenses>.
  17  */
  18
  19 #include <stdio.h>
  20 #include <stdlib.h>
  21 #include <unistd.h>
  22 #include <string.h>
  23 #include "utils.h"
  24 #include "tc_util.h"
  25 #include <linux/tc_act/tc_connmark.h>
  26
  27 static void
  28 explain(void)
  29 {
  30         fprintf(stderr,
  31                 "Usage: ... connmark [zone ZONE] [CONTROL] [index <INDEX>]\n"
  32                 "where :\n"
  33                 "\tZONE is the conntrack zone\n"
  34                 "\tCONTROL := reclassify | pipe | drop | continue | ok |\n"
  35                 "\t           goto chain <CHAIN_INDEX>\n");
  36 }
  37
  38 static void
  39 usage(void)
  40 {
  41         explain();
  42         exit(-1);
  43 }
  44
  45 static int
  46 parse_connmark(struct action_util *a, int *argc_p, char ***argv_p, int tca_id,
  47               struct nlmsghdr *n)
  48 {
  49         struct tc_connmark sel = {};
  50         char **argv = *argv_p;
  51         int argc = *argc_p;
  52         int ok = 0;
  53         struct rtattr *tail;
  54
  55         while (argc > 0) {
  56                 if (matches(*argv, "connmark") == 0) {
  57                         ok = 1;
  58                         argc--;
  59                         argv++;
  60                 } else if (matches(*argv, "help") == 0) {
  61                         usage();
  62                 } else {
  63                         break;
  64                 }
  65
  66         }
  67
  68         if (!ok) {
  69                 explain();
  70                 return -1;
  71         }
  72
  73         if (argc) {
  74                 if (matches(*argv, "zone") == 0) {
  75                         NEXT_ARG();
  76                         if (get_u16(&sel.zone, *argv, 10)) {
  77                                 fprintf(stderr, "connmark: Illegal \"zone\"\n");
  78                                 return -1;
  79                         }
  80                         argc--;
  81                         argv++;
  82                 }
  83         }
  84
  85         parse_action_control_dflt(&argc, &argv, &sel.action, false, TC_ACT_PIPE);
  86
  87         if (argc) {
  88                 if (matches(*argv, "index") == 0) {
  89                         NEXT_ARG();
  90                         if (get_u32(&sel.index, *argv, 10)) {
  91                                 fprintf(stderr, "connmark: Illegal \"index\"\n");
  92                                 return -1;
  93                         }
  94                         argc--;
  95                         argv++;
  96                 }
  97         }
  98
  99         tail = addattr_nest(n, MAX_MSG, tca_id);
 100         addattr_l(n, MAX_MSG, TCA_CONNMARK_PARMS, &sel, sizeof(sel));
 101         addattr_nest_end(n, tail);
 102
 103         *argc_p = argc;
 104         *argv_p = argv;
 105         return 0;
 106 }
 107
 108 static int print_connmark(struct action_util *au, FILE *f, struct rtattr *arg)
 109 {
 110         struct rtattr *tb[TCA_CONNMARK_MAX + 1];
 111         struct tc_connmark *ci;
 112
 113         if (arg == NULL)
 114                 return -1;
 115
 116         parse_rtattr_nested(tb, TCA_CONNMARK_MAX, arg);
 117         if (tb[TCA_CONNMARK_PARMS] == NULL) {
 118                 fprintf(stderr, "Missing connmark parameters\n");
 119                 return -1;
 120         }
 121
 122         ci = RTA_DATA(tb[TCA_CONNMARK_PARMS]);
 123
 124         print_string(PRINT_ANY, "kind", "%s ", "connmark");
 125         print_uint(PRINT_ANY, "zone", "zone %u", ci->zone);
 126         print_action_control(f, " ", ci->action, "");
 127
 128         print_nl();
 129         print_uint(PRINT_ANY, "index", "\t index %u", ci->index);
 130         print_int(PRINT_ANY, "ref", " ref %d", ci->refcnt);
 131         print_int(PRINT_ANY, "bind", " bind %d", ci->bindcnt);
 132
 133         if (show_stats) {
 134                 if (tb[TCA_CONNMARK_TM]) {
 135                         struct tcf_t *tm = RTA_DATA(tb[TCA_CONNMARK_TM]);
 136
 137                         print_tm(f, tm);
 138                 }
 139         }
 140         print_nl();
 141
 142         return 0;
 143 }
 144
 145 struct action_util connmark_action_util = {
 146         .id = "connmark",
 147         .parse_aopt = parse_connmark,
 148         .print_aopt = print_connmark,
 149 };