proto-shell: implement host route dependencies

diff --git a/proto-shell.c b/proto-shell.c
index 6312d9ec3d2b0f7a05efd20f85d7a8c5b42e1d21..78585df40b09957ca540adbd55561c9fb438519c 100644 (file)
--- a/proto-shell.c
+++ b/proto-shell.c
@@ -49,6 +49,16 @@ struct proto_shell_handler {
        char script_name[];
 };
 
+struct proto_shell_dependency {
+       struct list_head list;
+
+       struct proto_shell_state *proto;
+       struct interface_user dep;
+
+       union if_addr host;
+       bool v6;
+};
+
 struct proto_shell_state {
        struct interface_proto_state proto;
        struct proto_shell_handler *handler;
@@ -63,8 +73,66 @@ struct proto_shell_state {
        bool proto_task_killed;
 
        int last_error;
+
+       struct list_head deps;
 };
 
+static void
+proto_shell_check_dependencies(struct proto_shell_state *state)
+{
+       struct proto_shell_dependency *dep;
+       bool available = true;
+
+       list_for_each_entry(dep, &state->deps, list) {
+               if (dep->dep.iface)
+                       continue;
+
+               available = false;
+               break;
+       }
+
+       interface_set_available(state->proto.iface, available);
+}
+
+static void
+proto_shell_if_up_cb(struct interface_user *dep, struct interface *iface,
+                    enum interface_event ev);
+static void
+proto_shell_if_down_cb(struct interface_user *dep, struct interface *iface,
+                      enum interface_event ev);
+
+static void
+proto_shell_update_host_dep(struct proto_shell_dependency *dep)
+{
+       struct interface *iface;
+
+       if (dep->dep.iface)
+               goto out;
+
+       iface = interface_ip_add_target_route(&dep->host, dep->v6);
+       if (!iface)
+               goto out;
+
+       interface_remove_user(&dep->dep);
+       dep->dep.cb = proto_shell_if_down_cb;
+       interface_add_user(&dep->dep, iface);
+
+out:
+       proto_shell_check_dependencies(dep->proto);
+}
+
+static void
+proto_shell_clear_host_dep(struct proto_shell_state *state)
+{
+       struct proto_shell_dependency *dep, *tmp;
+
+       list_for_each_entry_safe(dep, tmp, &state->deps, list) {
+               interface_remove_user(&dep->dep);
+               list_del(&dep->list);
+               free(dep);
+       }
+}
+
 static int
 proto_shell_handler(struct interface_proto_state *proto,
                    enum interface_proto_cmd cmd, bool force)
@@ -86,6 +154,7 @@ proto_shell_handler(struct interface_proto_state *proto,
        if (cmd == PROTO_CMD_SETUP) {
                action = "setup";
                state->last_error = -1;
+               proto_shell_clear_host_dep(state);
        } else {
                if (state->sm == S_TEARDOWN)
                        return 0;
@@ -130,6 +199,41 @@ proto_shell_handler(struct interface_proto_state *proto,
        return ret;
 }
 
+static void
+proto_shell_if_up_cb(struct interface_user *dep, struct interface *iface,
+                    enum interface_event ev)
+{
+       struct proto_shell_dependency *pdep;
+
+       if (ev != IFEV_UP)
+               return;
+
+       pdep = container_of(dep, struct proto_shell_dependency, dep);
+       proto_shell_update_host_dep(pdep);
+}
+
+static void
+proto_shell_if_down_cb(struct interface_user *dep, struct interface *iface,
+                      enum interface_event ev)
+{
+       struct proto_shell_dependency *pdep;
+       struct proto_shell_state *state;
+
+       if (ev == IFEV_UP)
+               return;
+
+       pdep = container_of(dep, struct proto_shell_dependency, dep);
+       interface_remove_user(dep);
+       dep->cb = proto_shell_if_up_cb;
+       interface_add_user(dep, NULL);
+
+       state = pdep->proto;
+       if (state->sm == S_IDLE) {
+               state->proto.proto_event(&state->proto, IFPEV_LINK_LOST);
+               proto_shell_handler(&state->proto, PROTO_CMD_TEARDOWN, false);
+       }
+}
+
 static void
 proto_shell_task_finish(struct proto_shell_state *state,
                        struct netifd_process *task)
@@ -275,6 +379,7 @@ enum {
        NOTIFY_TUNNEL,
        NOTIFY_DATA,
        NOTIFY_KEEP,
+       NOTIFY_HOST,
        __NOTIFY_LAST
 };
 
@@ -293,6 +398,7 @@ static const struct blobmsg_policy notify_attr[__NOTIFY_LAST] = {
        [NOTIFY_TUNNEL] = { .name = "tunnel", .type = BLOBMSG_TYPE_TABLE },
        [NOTIFY_DATA] = { .name = "data", .type = BLOBMSG_TYPE_TABLE },
        [NOTIFY_KEEP] = { .name = "keep", .type = BLOBMSG_TYPE_BOOL },
+       [NOTIFY_HOST] = { .name = "host", .type = BLOBMSG_TYPE_STRING },
 };
 
 static int
@@ -491,6 +597,32 @@ proto_shell_set_available(struct proto_shell_state *state, struct blob_attr **tb
        return 0;
 }
 
+static int
+proto_shell_add_host_dependency(struct proto_shell_state *state, struct blob_attr **tb)
+{
+       struct proto_shell_dependency *dep;
+       struct blob_attr *host = tb[NOTIFY_HOST];
+
+       if (!host)
+               return UBUS_STATUS_INVALID_ARGUMENT;
+
+       dep = calloc(1, sizeof(*dep));
+       if (!inet_pton(AF_INET, blobmsg_data(host), &dep->host)) {
+               free(dep);
+               return UBUS_STATUS_INVALID_ARGUMENT;
+       }
+
+       dep->proto = state;
+       dep->dep.cb = proto_shell_if_up_cb;
+       interface_add_user(&dep->dep, NULL);
+       list_add(&dep->list, &state->deps);
+       proto_shell_update_host_dep(dep);
+       if (!dep->dep.iface)
+               return UBUS_STATUS_NOT_FOUND;
+
+       return 0;
+}
+
 static int
 proto_shell_notify(struct interface_proto_state *proto, struct blob_attr *attr)
 {
@@ -516,6 +648,8 @@ proto_shell_notify(struct interface_proto_state *proto, struct blob_attr *attr)
                return proto_shell_block_restart(state, tb);
        case 5:
                return proto_shell_set_available(state, tb);
+       case 6:
+               return proto_shell_add_host_dependency(state, tb);
        default:
                return UBUS_STATUS_INVALID_ARGUMENT;
        }
@@ -528,6 +662,8 @@ proto_shell_attach(const struct proto_handler *h, struct interface *iface,
        struct proto_shell_state *state;
 
        state = calloc(1, sizeof(*state));
+       INIT_LIST_HEAD(&state->deps);
+
        state->config = malloc(blob_pad_len(attr));
        if (!state->config)
                goto error;