[LEDE-DEV] [PATCH netifd] proto: allow configuring deprecated static IPv6 addresses

[Matthias Schiffer]

Add a new boolean attribute ip6preferred to the static protocol which can
be set to 0 to mark IPv6 addresses as deprecated (set the preferred
lifetime to 0). This is useful to configure addresses that may be used for
incoming, but not for outgoing connections unless bound explicitly.

Signed-off-by: Matthias Schiffer <mschiffer at universe-factory.net>
---
 proto.c | 18 +++++++++++++-----
 1 file changed, 13 insertions(+), 5 deletions(-)

diff --git a/proto.c b/proto.c
index 23304f3..a8642db 100644
--- a/proto.c
+++ b/proto.c
@@ -36,6 +36,7 @@ enum {
 	OPT_GATEWAY,
 	OPT_IP6GW,
 	OPT_IP6PREFIX,
+	OPT_IP6PREFERRED,
 	__OPT_MAX,
 };
 
@@ -47,6 +48,7 @@ static const struct blobmsg_policy proto_ip_attributes[__OPT_MAX] = {
 	[OPT_GATEWAY] = { .name = "gateway", .type = BLOBMSG_TYPE_STRING },
 	[OPT_IP6GW] = { .name = "ip6gw", .type = BLOBMSG_TYPE_STRING },
 	[OPT_IP6PREFIX] = { .name = "ip6prefix", .type = BLOBMSG_TYPE_ARRAY },
+	[OPT_IP6PREFERRED] = { .name = "ip6preferred", .type = BLOBMSG_TYPE_BOOL },
 };
 
 static const struct uci_blob_param_info proto_ip_attr_info[__OPT_MAX] = {
@@ -113,7 +115,7 @@ alloc_device_addr(bool v6, bool ext)
 
 static bool
 parse_addr(struct interface *iface, const char *str, bool v6, int mask,
-	   bool ext, uint32_t broadcast)
+	   bool ext, uint32_t broadcast, bool pref)
 {
 	struct device_addr *addr;
 	int af = v6 ? AF_INET6 : AF_INET;
@@ -136,6 +138,9 @@ parse_addr(struct interface *iface, const char *str, bool v6, int mask,
 	if (broadcast)
 		addr->broadcast = broadcast;
 
+	if (!pref)
+		addr->preferred_until = system_get_rtime();
+
 	vlist_add(&iface->proto_ip.addr, &addr->node, &addr->flags);
 	return true;
 
@@ -148,7 +153,7 @@ error:
 
 static int
 parse_static_address_option(struct interface *iface, struct blob_attr *attr,
-			    bool v6, int netmask, bool ext, uint32_t broadcast)
+			    bool v6, int netmask, bool ext, uint32_t broadcast, bool pref)
 {
 	struct blob_attr *cur;
 	int n_addr = 0;
@@ -160,7 +165,7 @@ parse_static_address_option(struct interface *iface, struct blob_attr *attr,
 
 		n_addr++;
 		if (!parse_addr(iface, blobmsg_data(cur), v6, netmask, ext,
-				broadcast))
+				broadcast, pref))
 			return -1;
 	}
 
@@ -400,6 +405,7 @@ proto_apply_static_ip_settings(struct interface *iface, struct blob_attr *attr)
 	struct blob_attr *cur;
 	const char *error;
 	unsigned int netmask = 32;
+	bool ip6pref;
 	int n_v4 = 0, n_v6 = 0;
 	struct in_addr bcast = {};
 
@@ -420,13 +426,15 @@ proto_apply_static_ip_settings(struct interface *iface, struct blob_attr *attr)
 		}
 	}
 
+	ip6pref = blobmsg_get_bool_default(tb[OPT_IP6PREFERRED], true);
+
 	if ((cur = tb[OPT_IPADDR]))
 		n_v4 = parse_static_address_option(iface, cur, false,
-			netmask, false, bcast.s_addr);
+			netmask, false, bcast.s_addr, true);
 
 	if ((cur = tb[OPT_IP6ADDR]))
 		n_v6 = parse_static_address_option(iface, cur, true,
-			128, false, 0);
+			128, false, 0, ip6pref);
 
 	if ((cur = tb[OPT_IP6PREFIX]))
 		if (parse_prefix_list(iface, cur) < 0)
-- 
2.10.2