Add 6rd options to tunnel spec.

This patch adds support for setting the 6rd tunnel options. These are the same
options normally specified with `ip tunnel 6rd ...`.

Signed-off-by: Stéphan Kochen <stephan@kochen.nl>

3 files changed, 38 insertions, 6 deletions

diff --git a/system-linux.c b/system-linux.c
index ceb5ac5..aaa8230 100644
--- a/system-linux.c
+++ b/system-linux.c
@@ -1026,7 +1026,7 @@ int system_add_ip_tunnel(const char *name, struct blob_attr *attr)
 	struct blob_attr *cur;
 	struct ip_tunnel_parm p;
 	const char *base, *str;
-	int cmd = SIOCADDTUNNEL;
+	bool is_sit;
 
 	system_del_ip_tunnel(name);
 
@@ -1035,12 +1035,12 @@ int system_add_ip_tunnel(const char *name, struct blob_attr *attr)
 	blobmsg_parse(tunnel_attr_list.params, __TUNNEL_ATTR_MAX, tb,
 		blob_data(attr), blob_len(attr));
 
-	cur = tb[TUNNEL_ATTR_TYPE];
-	if (!cur)
+	if (!(cur = tb[TUNNEL_ATTR_TYPE]))
 		return -EINVAL;
-
 	str = blobmsg_data(cur);
-	if (!strcmp(str, "sit")) {
+	is_sit = !strcmp(str, "sit");
+
+	if (is_sit) {
 		p.iph.protocol = IPPROTO_IPV6;
 		base = "sit0";
 	} else
@@ -1062,5 +1062,33 @@ int system_add_ip_tunnel(const char *name, struct blob_attr *attr)
 	}
 
 	strncpy(p.name, name, sizeof(p.name));
-	return tunnel_ioctl(base, cmd, &p);
+	if (tunnel_ioctl(base, SIOCADDTUNNEL, &p) < 0)
+		return -1;
+
+	cur = tb[TUNNEL_ATTR_6RD_PREFIX];
+	if (cur && is_sit) {
+		unsigned int mask;
+		struct ip_tunnel_6rd p6;
+
+		memset(&p6, 0, sizeof(p6));
+
+		if (!parse_ip_and_netmask(AF_INET6, blobmsg_data(cur),
+					&p6.prefix, &mask) || mask > 128)
+			return -EINVAL;
+		p6.prefixlen = mask;
+
+		if ((cur = tb[TUNNEL_ATTR_6RD_RELAY_PREFIX])) {
+			if (!parse_ip_and_netmask(AF_INET, blobmsg_data(cur),
+						&p6.relay_prefix, &mask) || mask > 32)
+				return -EINVAL;
+			p6.relay_prefixlen = mask;
+		}
+
+		if (tunnel_ioctl(name, SIOCADD6RD, &p6) < 0) {
+			system_del_ip_tunnel(name);
+			return -1;
+		}
+	}
+
+	return 0;
 }
diff --git a/system.c b/system.c
index c85d0e4..1096ad2 100644
--- a/system.c
+++ b/system.c
@@ -19,6 +19,8 @@ static const struct blobmsg_policy tunnel_attrs[__TUNNEL_ATTR_MAX] = {
 	[TUNNEL_ATTR_LOCAL] = { "local", BLOBMSG_TYPE_STRING },
 	[TUNNEL_ATTR_REMOTE] = { "remote", BLOBMSG_TYPE_STRING },
 	[TUNNEL_ATTR_TTL] = { "ttl", BLOBMSG_TYPE_INT32 },
+	[TUNNEL_ATTR_6RD_PREFIX] = { "6rd-prefix", BLOBMSG_TYPE_STRING },
+	[TUNNEL_ATTR_6RD_RELAY_PREFIX] = { "6rd-relay-prefix", BLOBMSG_TYPE_STRING },
 };
 
 const struct config_param_list tunnel_attr_list = {
diff --git a/system.h b/system.h
index 73ceb41..5e275ca 100644
--- a/system.h
+++ b/system.h
@@ -24,6 +24,8 @@ enum tunnel_param {
 	TUNNEL_ATTR_REMOTE,
 	TUNNEL_ATTR_LOCAL,
 	TUNNEL_ATTR_TTL,
+	TUNNEL_ATTR_6RD_PREFIX,
+	TUNNEL_ATTR_6RD_RELAY_PREFIX,
 	__TUNNEL_ATTR_MAX
 };