libxtables: support for XTTYPE_PLENMASK
Signed-off-by: Jan Engelhardt <jengelh@medozas.de>
diff --git a/xtoptions.c b/xtoptions.c
index 86498a9..2bd66f9 100644
--- a/xtoptions.c
+++ b/xtoptions.c
@@ -561,6 +561,47 @@
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 @@
[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 @@
[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),
};
/**