release/src/router/iptables/extensions/libip6t_connbytes.c

   1 /* Shared library add-on to iptables to add byte tracking support. */
   2 #include <stdio.h>
   3 #include <netdb.h>
   4 #include <string.h>
   5 #include <stdlib.h>
   6 #include <getopt.h>
   7 #include <ip6tables.h>
   8 #include <linux/netfilter/nf_conntrack_common.h>
   9 #include <linux/netfilter_ipv6/ip6_tables.h>
  10 #include <linux/netfilter_ipv4/ipt_connbytes.h>
  11
  12 /* Function which prints out usage message. */
  13 static void
  14 help(void)
  15 {
  16         printf(
  17 "connbytes v%s options:\n"
  18 " [!] --connbytes from:[to]\n"
  19 "     --connbytes-dir [original, reply, both]\n"
  20 "     --connbytes-mode [packets, bytes, avgpkt]\n"
  21 "\n", IPTABLES_VERSION);
  22 }
  23
  24 static struct option opts[] = {
  25         { "connbytes", 1, 0, '1' },
  26         { "connbytes-dir", 1, 0, '2' },
  27         { "connbytes-mode", 1, 0, '3' },
  28         {0}
  29 };
  30
  31 static void
  32 parse_range(const char *arg, struct ipt_connbytes_info *si)
  33 {
  34         char *colon,*p;
  35
  36         si->count.from = strtoul(arg,&colon,10);
  37         if (*colon != ':')
  38                 exit_error(PARAMETER_PROBLEM, "Bad range `%s'", arg);
  39         si->count.to = strtoul(colon+1,&p,10);
  40         if (p == colon+1) {
  41                 /* second number omited */
  42                 si->count.to = 0xffffffff;
  43         }
  44         if (si->count.from > si->count.to)
  45                 exit_error(PARAMETER_PROBLEM, "%llu should be less than %llu",
  46                            si->count.from, si->count.to);
  47 }
  48
  49 /* Function which parses command options; returns true if it
  50    ate an option */
  51 static int
  52 parse(int c, char **argv, int invert, unsigned int *flags,
  53       const struct ip6t_entry *entry,
  54       unsigned int *nfcache,
  55       struct ip6t_entry_match **match)
  56 {
  57         struct ipt_connbytes_info *sinfo = (struct ipt_connbytes_info *)(*match)->data;
  58         unsigned long i;
  59
  60         switch (c) {
  61         case '1':
  62                 if (check_inverse(optarg, &invert, &optind, 0))
  63                         optind++;
  64
  65                 parse_range(argv[optind-1], sinfo);
  66                 if (invert) {
  67                         i = sinfo->count.from;
  68                         sinfo->count.from = sinfo->count.to;
  69                         sinfo->count.to = i;
  70                 }
  71                 *flags |= 1;
  72                 break;
  73         case '2':
  74                 if (!strcmp(optarg, "original"))
  75                         sinfo->direction = IPT_CONNBYTES_DIR_ORIGINAL;
  76                 else if (!strcmp(optarg, "reply"))
  77                         sinfo->direction = IPT_CONNBYTES_DIR_REPLY;
  78                 else if (!strcmp(optarg, "both"))
  79                         sinfo->direction = IPT_CONNBYTES_DIR_BOTH;
  80                 else
  81                         exit_error(PARAMETER_PROBLEM,
  82                                    "Unknown --connbytes-dir `%s'", optarg);
  83
  84                 *flags |= 2;
  85                 break;
  86         case '3':
  87                 if (!strcmp(optarg, "packets"))
  88                         sinfo->what = IPT_CONNBYTES_PKTS;
  89                 else if (!strcmp(optarg, "bytes"))
  90                         sinfo->what = IPT_CONNBYTES_BYTES;
  91                 else if (!strcmp(optarg, "avgpkt"))
  92                         sinfo->what = IPT_CONNBYTES_AVGPKT;
  93                 else
  94                         exit_error(PARAMETER_PROBLEM,
  95                                    "Unknown --connbytes-mode `%s'", optarg);
  96                 *flags |= 4;
  97                 break;
  98         default:
  99                 return 0;
 100         }
 101
 102         return 1;
 103 }
 104
 105 static void final_check(unsigned int flags)
 106 {
 107         if (flags != 7)
 108                 exit_error(PARAMETER_PROBLEM, "You must specify `--connbytes'"
 109                            "`--connbytes-dir' and `--connbytes-mode'");
 110 }
 111
 112 static void print_mode(struct ipt_connbytes_info *sinfo)
 113 {
 114         switch (sinfo->what) {
 115                 case IPT_CONNBYTES_PKTS:
 116                         fputs("packets ", stdout);
 117                         break;
 118                 case IPT_CONNBYTES_BYTES:
 119                         fputs("bytes ", stdout);
 120                         break;
 121                 case IPT_CONNBYTES_AVGPKT:
 122                         fputs("avgpkt ", stdout);
 123                         break;
 124                 default:
 125                         fputs("unknown ", stdout);
 126                         break;
 127         }
 128 }
 129
 130 static void print_direction(struct ipt_connbytes_info *sinfo)
 131 {
 132         switch (sinfo->direction) {
 133                 case IPT_CONNBYTES_DIR_ORIGINAL:
 134                         fputs("original ", stdout);
 135                         break;
 136                 case IPT_CONNBYTES_DIR_REPLY:
 137                         fputs("reply ", stdout);
 138                         break;
 139                 case IPT_CONNBYTES_DIR_BOTH:
 140                         fputs("both ", stdout);
 141                         break;
 142                 default:
 143                         fputs("unknown ", stdout);
 144                         break;
 145         }
 146 }
 147
 148 /* Prints out the matchinfo. */
 149 static void
 150 print(const struct ip6t_ip6 *ip,
 151       const struct ip6t_entry_match *match,
 152       int numeric)
 153 {
 154         struct ipt_connbytes_info *sinfo = (struct ipt_connbytes_info *)match->data;
 155
 156         if (sinfo->count.from > sinfo->count.to)
 157                 printf("connbytes ! %llu:%llu ", sinfo->count.to,
 158                         sinfo->count.from);
 159         else
 160                 printf("connbytes %llu:%llu ",sinfo->count.from,
 161                         sinfo->count.to);
 162         print_mode(sinfo);
 163
 164         fputs("direction ", stdout);
 165         print_direction(sinfo);
 166 }
 167
 168 /* Saves the matchinfo in parsable form to stdout. */
 169 static void save(const struct ip6t_ip6 *ip, const struct ip6t_entry_match *match)
 170 {
 171         struct ipt_connbytes_info *sinfo = (struct ipt_connbytes_info *)match->data;
 172
 173         if (sinfo->count.from > sinfo->count.to)
 174                 printf("! --connbytes %llu:%llu ", sinfo->count.to,
 175                         sinfo->count.from);
 176         else
 177                 printf("--connbytes %llu:%llu ", sinfo->count.from,
 178                         sinfo->count.to);
 179
 180         fputs("--connbytes-mode ", stdout);
 181         print_mode(sinfo);
 182
 183         fputs("--connbytes-dir ", stdout);
 184         print_direction(sinfo);
 185 }
 186
 187 static struct ip6tables_match state = {
 188         .next           = NULL,
 189         .name           = "connbytes",
 190         .version        = IPTABLES_VERSION,
 191         .size           = IP6T_ALIGN(sizeof(struct ipt_connbytes_info)),
 192         .userspacesize  = IP6T_ALIGN(sizeof(struct ipt_connbytes_info)),
 193         .help           = &help,
 194         .parse          = &parse,
 195         .final_check    = &final_check,
 196         .print          = &print,
 197         .save           = &save,
 198         .extra_opts     = opts
 199 };
 200
 201 void _init(void)
 202 {
 203         register_match6(&state);
 204 }