icmp: split icmp type printing to header file

libebt_ip will get icmp support soon, unify icmp name
mapping a bit so we can re-use this code from libebt_ip.c.

It doesn't seem to be too useful to move to libxtables
(as its icmp specific), so add a hedaer file for this to reduce
copy & paste needs.

Signed-off-by: Florian Westphal <fw@strlen.de>

1 files changed, 25 insertions, 0 deletions

diff --git a/extensions/libxt_icmp.h b/extensions/libxt_icmp.h
new file mode 100644
index 00000000..5820206e
--- /dev/null
+++ b/extensions/libxt_icmp.h
@@ -0,0 +1,25 @@
+struct xt_icmp_names {
+	const char *name;
+	uint8_t type;
+	uint8_t code_min, code_max;
+};
+
+static void xt_print_icmp_types(const struct xt_icmp_names *icmp_codes,
+				unsigned int n_codes)
+{
+	unsigned int i;
+
+	for (i = 0; i < n_codes; ++i) {
+		if (i && icmp_codes[i].type == icmp_codes[i-1].type) {
+			if (icmp_codes[i].code_min == icmp_codes[i-1].code_min
+			    && (icmp_codes[i].code_max
+				== icmp_codes[i-1].code_max))
+				printf(" (%s)", icmp_codes[i].name);
+			else
+				printf("\n   %s", icmp_codes[i].name);
+		}
+		else
+			printf("\n%s", icmp_codes[i].name);
+	}
+	printf("\n");
+}