+ struct device_user l3_dev;
+
+ struct uloop_timeout setup_timeout;
+ struct uloop_process setup_task;
+ struct uloop_process teardown_task;
+ bool teardown_pending;
+};
+
+static int
+run_script(const char **argv, struct uloop_process *proc)
+{
+ int pid;
+
+ if ((pid = fork()) < 0)
+ return -1;
+
+ if (!pid) {
+ fchdir(proto_fd);
+ execvp(argv[0], (char **) argv);
+ exit(127);
+ }
+
+ if (pid < 0)
+ return -1;
+
+ proc->pid = pid;
+ uloop_process_add(proc);
+
+ return 0;
+}
+
+static int
+proto_shell_handler(struct interface_proto_state *proto,
+ enum interface_proto_cmd cmd, bool force)
+{
+ struct proto_shell_state *state;
+ struct proto_shell_handler *handler;
+ struct uloop_process *proc;
+ const char *argv[6];
+ const char *action;
+ char *config;
+ int ret, i = 0;
+
+ state = container_of(proto, struct proto_shell_state, proto);
+ handler = state->handler;
+
+ if (cmd == PROTO_CMD_SETUP) {
+ action = "setup";
+ proc = &state->setup_task;
+ } else {
+ action = "teardown";
+ proc = &state->teardown_task;
+ if (state->setup_task.pending) {
+ uloop_timeout_set(&state->setup_timeout, 1000);
+ kill(state->setup_task.pid, SIGINT);
+ state->teardown_pending = true;
+ return 0;
+ }
+ }
+
+ config = blobmsg_format_json(state->config, true);
+ if (!config)
+ return -1;
+
+ argv[i++] = handler->script_name;
+ argv[i++] = handler->proto.name;
+ argv[i++] = action;
+ argv[i++] = proto->iface->name;
+ argv[i++] = config;
+ if (proto->iface->main_dev.dev)
+ argv[i++] = proto->iface->main_dev.dev->ifname;
+ argv[i] = NULL;
+
+ ret = run_script(argv, proc);
+ free(config);
+
+ return ret;
+}
+
+static void
+proto_shell_setup_timeout_cb(struct uloop_timeout *timeout)
+{
+ struct proto_shell_state *state;
+
+ state = container_of(timeout, struct proto_shell_state, setup_timeout);
+ kill(state->setup_task.pid, SIGKILL);
+}
+
+static void
+proto_shell_setup_cb(struct uloop_process *p, int ret)
+{
+ struct proto_shell_state *state;
+
+ state = container_of(p, struct proto_shell_state, setup_task);
+ uloop_timeout_cancel(&state->setup_timeout);
+ if (state->teardown_pending) {
+ state->teardown_pending = false;
+ proto_shell_handler(&state->proto, PROTO_CMD_TEARDOWN, false);
+ }
+}
+
+static void
+proto_shell_teardown_cb(struct uloop_process *p, int ret)
+{
+ struct proto_shell_state *state;
+
+ state = container_of(p, struct proto_shell_state, teardown_task);
+ state->proto.proto_event(&state->proto, IFPEV_DOWN);
+ if (state->l3_dev.dev)
+ device_remove_user(&state->l3_dev);
+}
+
+static void
+proto_shell_free(struct interface_proto_state *proto)
+{
+ struct proto_shell_state *state;
+
+ state = container_of(proto, struct proto_shell_state, proto);
+ free(state->config);
+ free(state);
+}
+
+enum {
+ NOTIFY_LINK_UP,
+ NOTIFY_IFNAME,
+ __NOTIFY_LAST
+};
+
+static const struct blobmsg_policy notify_attr[__NOTIFY_LAST] = {
+ [NOTIFY_LINK_UP] = { .name = "link-up", .type = BLOBMSG_TYPE_BOOL },
+ [NOTIFY_IFNAME] = { .name = "ifname", .type = BLOBMSG_TYPE_STRING },
+};
+
+static int
+proto_shell_notify(struct interface_proto_state *proto, struct blob_attr *attr)
+{
+ struct proto_shell_state *state;
+ struct blob_attr *tb[__NOTIFY_LAST];
+ bool up;
+
+ state = container_of(proto, struct proto_shell_state, proto);
+
+ blobmsg_parse(notify_attr, __NOTIFY_LAST, tb, blob_data(attr), blob_len(attr));
+ if (!tb[NOTIFY_LINK_UP])
+ return UBUS_STATUS_INVALID_ARGUMENT;
+
+ up = blobmsg_get_bool(tb[NOTIFY_LINK_UP]);
+ if (up) {
+ if (!tb[NOTIFY_IFNAME])
+ return UBUS_STATUS_INVALID_ARGUMENT;
+
+ if (!state->l3_dev.dev) {
+ device_add_user(&state->l3_dev,
+ device_get(blobmsg_data(tb[NOTIFY_IFNAME]), true));
+ device_claim(&state->l3_dev);
+ state->proto.iface->l3_dev = &state->l3_dev;
+ }
+ state->proto.proto_event(&state->proto, IFPEV_UP);
+ } else {
+ state->proto.proto_event(&state->proto, IFPEV_LINK_LOST);
+ }
+
+ return 0;
+}
+
+struct interface_proto_state *
+proto_shell_attach(const struct proto_handler *h, struct interface *iface,
+ struct blob_attr *attr)