From e8b42fee7eaa1ba6df203fe0bc4496cae226cbd2 Mon Sep 17 00:00:00 2001 From: Jan Engelhardt Date: Mon, 2 May 2011 02:13:16 +0200 Subject: libxtables: support for XTTYPE_PLENMASK Signed-off-by: Jan Engelhardt --- xtoptions.c | 43 +++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 43 insertions(+) (limited to 'xtoptions.c') diff --git a/xtoptions.c b/xtoptions.c index 86498a97..2bd66f96 100644 --- a/xtoptions.c +++ b/xtoptions.c @@ -561,6 +561,47 @@ static void xtopt_parse_mport(struct xt_option_call *cb) free(lo_arg); } +static void xtopt_parse_plenmask(struct xt_option_call *cb) +{ + const struct xt_option_entry *entry = cb->entry; + uint32_t *mask = cb->val.inetmask.all; + unsigned int prefix_len = 128; + uint8_t max = 128; + + if (afinfo->family == NFPROTO_IPV6) + max = 128; + else if (afinfo->family == NFPROTO_IPV4) + max = 32; + + if (!xtables_strtoui(cb->arg, NULL, &prefix_len, 0, max)) + xt_params->exit_err(PARAMETER_PROBLEM, + "%s: bad value for option \"--%s\", " + "or out of range (%u-%u).\n", + cb->ext_name, entry->name, 0, max); + + memset(mask, 0xFF, sizeof(union nf_inet_addr)); + 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]); + if (entry->flags & XTOPT_PUT) + memcpy(XTOPT_MKPTR(cb), mask, sizeof(union nf_inet_addr)); +} + static void (*const xtopt_subparse[])(struct xt_option_call *) = { [XTTYPE_UINT8] = xtopt_parse_int, [XTTYPE_UINT16] = xtopt_parse_int, @@ -580,6 +621,7 @@ static void (*const xtopt_subparse[])(struct xt_option_call *) = { [XTTYPE_PORT_NE] = xtopt_parse_port, [XTTYPE_PORTRC] = xtopt_parse_mport, [XTTYPE_PORTRC_NE] = xtopt_parse_mport, + [XTTYPE_PLENMASK] = xtopt_parse_plenmask, }; static const size_t xtopt_psize[] = { @@ -599,6 +641,7 @@ static const size_t xtopt_psize[] = { [XTTYPE_PORT_NE] = sizeof(uint16_t), [XTTYPE_PORTRC] = sizeof(uint16_t[2]), [XTTYPE_PORTRC_NE] = sizeof(uint16_t[2]), + [XTTYPE_PLENMASK] = sizeof(union nf_inet_addr), }; /** -- cgit v1.2.3