From fea3814c696b7c93990d2a6325e8ca777f55914f Mon Sep 17 00:00:00 2001 From: "/C=JP/ST=JP/CN=Yasuyuki Kozakai/emailAddress=yasuyuki@netfilter.org" Date: Tue, 31 Jul 2007 16:47:38 +0000 Subject: Moves libip{,6}t_connlimit to libxt. Also fixes an option parsing bug (connlimit_parse() may receive a 'c' that is not from the connlimit options table). Signed-off-by: Jan Engelhardt --- extensions/libip6t_connlimit.c | 151 ----------------------------------------- 1 file changed, 151 deletions(-) delete mode 100644 extensions/libip6t_connlimit.c (limited to 'extensions/libip6t_connlimit.c') diff --git a/extensions/libip6t_connlimit.c b/extensions/libip6t_connlimit.c deleted file mode 100644 index d66cffb..0000000 --- a/extensions/libip6t_connlimit.c +++ /dev/null @@ -1,151 +0,0 @@ -/* Shared library add-on to iptables to add connection limit support. */ -#include -#include -#include -#include -#include -#include -#include -#include "../include/linux/netfilter/xt_connlimit.h" - -/* Function which prints out usage message. */ -static void connlimit_help(void) -{ - printf( -"connlimit v%s options:\n" -"[!] --connlimit-above n match if the number of existing " -" connections is (not) above n\n" -" --connlimit-mask n group hosts using mask\n" -"\n", IPTABLES_VERSION); -} - -static const struct option connlimit_opts[] = { - {"connlimit-above", 1, NULL, 1}, - {"connlimit-mask", 1, NULL, 2}, - {NULL}, -}; - -static void connlimit_init(struct ip6t_entry_match *match, unsigned int *nfc) -{ - struct xt_connlimit_info *info = (void *)match->data; - info->v6_mask[0] = - info->v6_mask[1] = - info->v6_mask[2] = - info->v6_mask[3] = 0xFFFFFFFF; -} - -static void prefix_to_netmask(u_int32_t *mask, unsigned int prefix_len) -{ - if (prefix_len == 0) { - mask[0] = mask[1] = mask[2] = mask[3] = 0; - } else if (prefix_len <= 32) { - mask[0] <<= 32 - prefix_len; - mask[1] = mask[2] = mask[3] = 0; - } else if (prefix_len <= 64) { - mask[1] <<= 32 - (prefix_len - 32); - mask[2] = mask[3] = 0; - } else if (prefix_len <= 96) { - mask[2] <<= 32 - (prefix_len - 64); - mask[3] = 0; - } else if (prefix_len <= 128) { - mask[3] <<= 32 - (prefix_len - 96); - } - mask[0] = htonl(mask[0]); - mask[1] = htonl(mask[1]); - mask[2] = htonl(mask[2]); - mask[3] = htonl(mask[3]); -} - -static int connlimit_parse(int c, char **argv, int invert, unsigned int *flags, - const struct ip6t_entry *entry, - unsigned int *nfcache, - struct ip6t_entry_match **match) -{ - struct xt_connlimit_info *info = (void *)(*match)->data; - char *err; - int i; - - if (*flags & c) - exit_error(PARAMETER_PROBLEM, - "--connlimit-above and/or --connlimit-mask may " - "only be given once"); - - switch (c) { - case 1: - check_inverse(optarg, &invert, &optind, 0); - info->limit = strtoul(argv[optind-1], NULL, 0); - info->inverse = invert; - break; - case 2: - i = strtoul(argv[optind-1], &err, 0); - if (i > 128 || *err != '\0') - exit_error(PARAMETER_PROBLEM, - "--connlimit-mask must be between 0 and 128"); - prefix_to_netmask(info->v6_mask, i); - break; - default: - return 0; - } - - *flags |= c; - return 1; -} - -/* Final check */ -static void connlimit_check(unsigned int flags) -{ - if (!(flags & 1)) - exit_error(PARAMETER_PROBLEM, - "You must specify \"--connlimit-above\""); -} - -static unsigned int count_bits(const u_int32_t *mask) -{ - unsigned int bits = 0, i; - u_int32_t tmp[4]; - - for (i = 0; i < 4; ++i) - for (tmp[i] = ~ntohl(mask[i]); tmp[i] != 0; tmp[i] >>= 1) - ++bits; - return 128 - bits; -} - -/* Prints out the matchinfo. */ -static void connlimit_print(const struct ip6t_ip6 *ip, - const struct ip6t_entry_match *match, int numeric) -{ - const struct xt_connlimit_info *info = (const void *)match->data; - - printf("#conn/%u %s %u ", count_bits(info->v6_mask), - info->inverse ? "<" : ">", info->limit); -} - -/* Saves the matchinfo in parsable form to stdout. */ -static void connlimit_save(const struct ip6t_ip6 *ip, - const struct ip6t_entry_match *match) -{ - const struct xt_connlimit_info *info = (const void *)match->data; - - printf("%s--connlimit-above %u --connlimit-mask %u ", - info->inverse ? "! " : "", info->limit, - count_bits(info->v6_mask)); -} - -static struct ip6tables_match connlimit_reg = { - .name = "connlimit", - .version = IPTABLES_VERSION, - .size = IP6T_ALIGN(sizeof(struct xt_connlimit_info)), - .userspacesize = offsetof(struct xt_connlimit_info, data), - .help = connlimit_help, - .init = connlimit_init, - .parse = connlimit_parse, - .final_check = connlimit_check, - .print = connlimit_print, - .save = connlimit_save, - .extra_opts = connlimit_opts, -}; - -void _init(void) -{ - register_match6(&connlimit_reg); -} -- cgit v1.2.3