network: Add support to group links.

Link groups are similar to port ranges found in managed switches.
You can add network interfaces to a numbered group and perform operations
on all the interfaces from that group at once.

1 files changed, 51 insertions, 0 deletions

diff --git a/src/network/networkd-link.c b/src/network/networkd-link.c
index e261473f6f..32fe86045d 100644
--- a/src/network/networkd-link.c
+++ b/src/network/networkd-link.c
@@ -1825,6 +1825,53 @@ int link_down(Link *link, link_netlink_message_handler_t callback) {
         return 0;
 }
 
+static int link_group_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
+        int r;
+
+        assert(link);
+
+        if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
+                return 1;
+
+        r = sd_netlink_message_get_errno(m);
+        if (r < 0)
+                log_link_message_warning_errno(link, m, r, "Could not set group for the interface");
+
+        return 1;
+}
+
+static int link_set_group(Link *link) {
+        _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
+        int r;
+
+        assert(link);
+        assert(link->network);
+        assert(link->manager);
+        assert(link->manager->rtnl);
+
+        if (link->network->group <= 0)
+                return 0;
+
+        log_link_debug(link, "Setting group");
+
+        r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
+        if (r < 0)
+                return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
+
+        r = sd_netlink_message_append_u32(req, IFLA_GROUP, link->network->group);
+        if (r < 0)
+                return log_link_error_errno(link, r, "Could not set link group: %m");
+
+        r = netlink_call_async(link->manager->rtnl, NULL, req, link_group_handler,
+                               link_netlink_destroy_callback, link);
+        if (r < 0)
+                return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
+
+        link_ref(link);
+
+        return 0;
+}
+
 static int link_handle_bound_to_list(Link *link) {
         Link *l;
         Iterator i;
@@ -2819,6 +2866,10 @@ static int link_configure(Link *link) {
         if (r < 0)
                 return r;
 
+        r = link_set_group(link);
+        if (r < 0)
+                return r;
+
         if (link_ipv4ll_enabled(link, ADDRESS_FAMILY_IPV4 | ADDRESS_FAMILY_FALLBACK_IPV4)) {
                 r = ipv4ll_configure(link);
                 if (r < 0)