add support for calls to a hotplug script on interface state changes
[project/netifd.git] / interface.c
index 0aa0b0d..3820050 100644 (file)
@@ -3,12 +3,35 @@
 #include <stdio.h>
 
 #include "netifd.h"
+#include "device.h"
+#include "interface.h"
+#include "interface-ip.h"
+#include "proto.h"
 #include "ubus.h"
+#include "config.h"
 
-LIST_HEAD(interfaces);
+struct vlist_tree interfaces;
+
+enum {
+       IFACE_ATTR_IFNAME,
+       IFACE_ATTR_PROTO,
+       IFACE_ATTR_AUTO,
+       IFACE_ATTR_MAX
+};
+
+static const struct blobmsg_policy iface_attrs[IFACE_ATTR_MAX] = {
+       [IFACE_ATTR_PROTO] = { .name = "proto", .type = BLOBMSG_TYPE_STRING },
+       [IFACE_ATTR_IFNAME] = { .name = "ifname", .type = BLOBMSG_TYPE_STRING },
+       [IFACE_ATTR_AUTO] = { .name = "auto", .type = BLOBMSG_TYPE_BOOL },
+};
+
+const struct config_param_list interface_attr_list = {
+       .n_params = IFACE_ATTR_MAX,
+       .params = iface_attrs,
+};
 
 static void
-clear_interface_errors(struct interface *iface)
+interface_clear_errors(struct interface *iface)
 {
        struct interface_error *error, *tmp;
 
@@ -23,7 +46,7 @@ void interface_add_error(struct interface *iface, const char *subsystem,
 {
        struct interface_error *error;
        int i, len = 0;
-       int *datalen;
+       int *datalen = NULL;
        char *dest;
 
        if (n_data) {
@@ -52,43 +75,59 @@ void interface_add_error(struct interface *iface, const char *subsystem,
        error->data[n_data] = NULL;
 }
 
-static int
+static void
 interface_event(struct interface *iface, enum interface_event ev)
 {
-       if (!iface->state || !iface->state->event)
-               return 0;
-
-       return iface->state->event(iface->state, ev);
+       interface_queue_event(iface, ev);
 }
 
 static void
-__set_interface_up(struct interface *iface)
+mark_interface_down(struct interface *iface)
 {
-       if (iface->up)
-               return;
+       vlist_flush_all(&iface->proto_addr);
+       vlist_flush_all(&iface->proto_route);
+       if (iface->main_dev.dev)
+               device_release(&iface->main_dev);
+       iface->state = IFS_DOWN;
+}
 
-       if (claim_device(iface->main_dev.dev) < 0)
-               return;
+static int
+__interface_set_up(struct interface *iface)
+{
+       int ret;
 
-       if (interface_event(iface, IFEV_UP) < 0) {
-               release_device(iface->main_dev.dev);
-               return;
+       if (iface->state != IFS_DOWN)
+               return 0;
+
+       if (iface->main_dev.dev) {
+               ret = device_claim(&iface->main_dev);
+               if (ret)
+                       return ret;
+       }
+
+       iface->state = IFS_SETUP;
+       ret = interface_proto_event(iface->proto, PROTO_CMD_SETUP, false);
+       if (ret) {
+               mark_interface_down(iface);
+               return ret;
        }
 
-       iface->up = true;
+       return 0;
+
 }
 
 static void
-__set_interface_down(struct interface *iface)
+__interface_set_down(struct interface *iface, bool force)
 {
-       clear_interface_errors(iface);
+       interface_clear_errors(iface);
 
-       if (!iface->up)
+       if (iface->state == IFS_DOWN ||
+               iface->state == IFS_TEARDOWN)
                return;
 
-       iface->up = false;
+       iface->state = IFS_TEARDOWN;
        interface_event(iface, IFEV_DOWN);
-       release_device(iface->main_dev.dev);
+       interface_proto_event(iface->proto, PROTO_CMD_TEARDOWN, force);
 }
 
 static void
@@ -109,112 +148,326 @@ interface_cb(struct device_user *dep, enum device_event ev)
                return;
        }
 
-       if (iface->active == new_state)
+       interface_set_available(iface, new_state);
+}
+
+void
+interface_set_available(struct interface *iface, bool new_state)
+{
+       if (iface->available == new_state)
                return;
 
-       iface->active = new_state;
+       D(INTERFACE, "Interface '%s', available=%d\n", iface->name, new_state);
+       iface->available = new_state;
 
        if (new_state) {
-               if (iface->autostart)
-                       __set_interface_up(iface);
+               if (iface->autostart && !config_init)
+                       interface_set_up(iface);
        } else
-               __set_interface_down(iface);
+               __interface_set_down(iface, true);
 }
 
-struct interface *
-alloc_interface(const char *name)
+static void
+interface_claim_device(struct interface *iface)
 {
-       struct interface *iface;
-
-       iface = get_interface(name);
-       if (iface)
-               return iface;
+       struct device *dev;
 
-       iface = calloc(1, sizeof(*iface));
-       iface->main_dev.cb = interface_cb;
-       iface->l3_iface = &iface->main_dev;
-       strncpy(iface->name, name, sizeof(iface->name) - 1);
-       list_add(&iface->list, &interfaces);
-       INIT_LIST_HEAD(&iface->errors);
+       if (iface->proto_handler &&
+               !(iface->proto_handler->flags & PROTO_FLAG_NODEV)) {
+               dev = device_get(iface->ifname, true);
+               if (dev)
+                       device_add_user(&iface->main_dev, dev);
+       }
+}
 
-       netifd_ubus_add_interface(iface);
 
-       return iface;
+static void
+interface_cleanup(struct interface *iface)
+{
+       interface_clear_errors(iface);
+       if (iface->main_dev.dev)
+               device_remove_user(&iface->main_dev);
+       interface_set_proto_state(iface, NULL);
 }
 
-void
-free_interface(struct interface *iface)
+static void
+interface_do_free(struct interface *iface)
 {
+       interface_cleanup(iface);
+       free(iface->config);
        netifd_ubus_remove_interface(iface);
-       list_del(&iface->list);
-       if (iface->state && iface->state->free)
-               iface->state->free(iface->state);
+       avl_delete(&interfaces.avl, &iface->node.avl);
        free(iface);
 }
 
-struct interface *
-get_interface(const char *name)
+static void
+interface_do_reload(struct interface *iface)
 {
-       struct interface *iface;
+       interface_cleanup(iface);
+
+       interface_claim_device(iface);
+       proto_init_interface(iface, iface->config);
+
+       if (iface->autostart && !config_init)
+               interface_set_up(iface);
+}
+
+static void
+interface_handle_config_change(struct interface *iface)
+{
+       switch(iface->config_state) {
+       case IFC_NORMAL:
+               break;
+       case IFC_RELOAD:
+               interface_do_reload(iface);
+               break;
+       case IFC_REMOVE:
+               interface_do_free(iface);
+               break;
+       }
+}
+
+static void
+interface_proto_cb(struct interface_proto_state *state, enum interface_proto_event ev)
+{
+       struct interface *iface = state->iface;
 
-       list_for_each_entry(iface, &interfaces, list) {
-               if (!strcmp(iface->name, name))
-                       return iface;
+       switch (ev) {
+       case IFPEV_UP:
+               if (iface->state != IFS_SETUP)
+                       return;
+
+               iface->state = IFS_UP;
+               interface_event(iface, IFEV_UP);
+               break;
+       case IFPEV_DOWN:
+               if (iface->state == IFS_DOWN)
+                       return;
+
+               mark_interface_down(iface);
+               interface_handle_config_change(iface);
+               break;
+       case IFPEV_LINK_LOST:
+               if (iface->state != IFS_UP)
+                       return;
+
+               iface->state = IFS_SETUP;
+               interface_event(iface, IFEV_DOWN);
+               break;
        }
-       return NULL;
+}
+
+void interface_set_proto_state(struct interface *iface, struct interface_proto_state *state)
+{
+       if (iface->proto) {
+               iface->proto->free(iface->proto);
+               iface->proto = NULL;
+       }
+       iface->state = IFS_DOWN;
+       iface->proto = state;
+       if (!state)
+               return;
+
+       state->proto_event = interface_proto_cb;
+       state->iface = iface;
+}
+
+void
+interface_init(struct interface *iface, const char *name,
+              struct blob_attr *config)
+{
+       struct blob_attr *tb[IFACE_ATTR_MAX];
+       struct blob_attr *cur;
+       const char *proto_name = NULL;
+
+       strncpy(iface->name, name, sizeof(iface->name) - 1);
+       INIT_LIST_HEAD(&iface->errors);
+       INIT_LIST_HEAD(&iface->hotplug_list);
+
+       iface->main_dev.cb = interface_cb;
+       iface->l3_dev = &iface->main_dev;
+
+       blobmsg_parse(iface_attrs, IFACE_ATTR_MAX, tb,
+                     blob_data(config), blob_len(config));
+
+       if ((cur = tb[IFACE_ATTR_PROTO]))
+               proto_name = blobmsg_data(cur);
+
+       proto_attach_interface(iface, proto_name);
+
+       if ((cur = tb[IFACE_ATTR_AUTO]))
+               iface->autostart = blobmsg_get_bool(cur);
+       else
+               iface->autostart = true;
+       iface->config_autostart = iface->autostart;
 }
 
 void
-interface_remove_link(struct interface *iface, struct device *llif)
+interface_add(struct interface *iface, struct blob_attr *config)
 {
-       struct device *dev = iface->main_dev.dev;
+       struct blob_attr *tb[IFACE_ATTR_MAX];
+       struct blob_attr *cur;
+
+       blobmsg_parse(iface_attrs, IFACE_ATTR_MAX, tb,
+                     blob_data(config), blob_len(config));
+
+       if ((cur = tb[IFACE_ATTR_IFNAME]))
+               iface->ifname = blobmsg_data(cur);
+
+       iface->config = config;
+       vlist_add(&interfaces, &iface->node);
+}
 
-       if (dev && dev->hotplug_ops) {
-               dev->hotplug_ops->del(dev, llif);
+void
+interface_remove_link(struct interface *iface, struct device *dev)
+{
+       struct device *mdev = iface->main_dev.dev;
+
+       if (mdev && mdev->hotplug_ops) {
+               mdev->hotplug_ops->del(mdev, dev);
                return;
        }
 
-       remove_device_user(&iface->main_dev);
+       device_remove_user(&iface->main_dev);
 }
 
 int
-interface_add_link(struct interface *iface, struct device *llif)
+interface_add_link(struct interface *iface, struct device *dev)
 {
-       struct device *dev = iface->main_dev.dev;
+       struct device *mdev = iface->main_dev.dev;
 
-       if (dev && dev->hotplug_ops)
-               return dev->hotplug_ops->add(dev, llif);
+       if (mdev && mdev->hotplug_ops)
+               return mdev->hotplug_ops->add(mdev, dev);
 
        if (iface->main_dev.dev)
                interface_remove_link(iface, NULL);
 
-       add_device_user(&iface->main_dev, llif);
+       device_add_user(&iface->main_dev, dev);
 
        return 0;
 }
 
 int
-set_interface_up(struct interface *iface)
+interface_set_up(struct interface *iface)
 {
        iface->autostart = true;
 
-       if (!iface->active) {
+       if (!iface->available) {
                interface_add_error(iface, "interface", "NO_DEVICE", NULL, 0);
                return -1;
        }
 
-       if (iface->up)
-               return -1;
+       if (iface->state != IFS_DOWN)
+               return 0;
 
-       __set_interface_up(iface);
-       return 0;
+       return __interface_set_up(iface);
 }
 
 int
-set_interface_down(struct interface *iface)
+interface_set_down(struct interface *iface)
 {
-       iface->autostart = false;
-       __set_interface_down(iface);
+       if (!iface) {
+               vlist_for_each_element(&interfaces, iface, node)
+                       __interface_set_down(iface, false);
+       } else {
+               iface->autostart = false;
+               __interface_set_down(iface, false);
+       }
 
        return 0;
 }
+
+void
+interface_start_pending(void)
+{
+       struct interface *iface;
+
+       vlist_for_each_element(&interfaces, iface, node) {
+               if (iface->available && iface->autostart)
+                       interface_set_up(iface);
+       }
+}
+
+static void
+set_config_state(struct interface *iface, enum interface_config_state s)
+{
+       iface->config_state = s;
+       if (iface->state == IFS_DOWN)
+               interface_handle_config_change(iface);
+       else
+               __interface_set_down(iface, false);
+}
+
+static void
+interface_change_config(struct interface *if_old, struct interface *if_new)
+{
+       struct blob_attr *old_config = if_old->config;
+       const char *old_ifname = if_old->ifname;
+       const struct proto_handler *proto = if_old->proto_handler;
+
+       interface_clear_errors(if_old);
+       if_old->config = if_new->config;
+       if (!if_old->config_autostart && if_new->config_autostart)
+               if_old->autostart = true;
+
+       if_old->config_autostart = if_new->config_autostart;
+       if_old->ifname = if_new->ifname;
+       if_old->proto_handler = if_new->proto_handler;
+
+       if (strcmp(old_ifname, if_new->ifname) != 0 ||
+               proto != if_new->proto_handler) {
+               D(INTERFACE, "Reload interface '%s' because of ifname/proto change\n",
+                 if_old->name);
+               goto reload;
+       }
+
+       if (!proto->config_params)
+               D(INTERFACE, "No config parameters for interface '%s'\n",
+                 if_old->name);
+       else if (!config_check_equal(old_config, if_new->config,
+                               proto->config_params)) {
+               D(INTERFACE, "Reload interface '%s because of config changes\n",
+                 if_old->name);
+               goto reload;
+       }
+
+       goto out;
+
+reload:
+       set_config_state(if_old, IFC_RELOAD);
+out:
+       free(old_config);
+       free(if_new);
+}
+
+static void
+interface_update(struct vlist_tree *tree, struct vlist_node *node_new,
+                struct vlist_node *node_old)
+{
+       struct interface *if_old = container_of(node_old, struct interface, node);
+       struct interface *if_new = container_of(node_new, struct interface, node);
+
+       if (node_old && node_new) {
+               D(INTERFACE, "Update interface '%s'\n", if_new->name);
+               interface_change_config(if_old, if_new);
+       } else if (node_old) {
+               D(INTERFACE, "Remove interface '%s'\n", if_old->name);
+               set_config_state(if_old, IFC_REMOVE);
+       } else if (node_new) {
+               D(INTERFACE, "Create interface '%s'\n", if_new->name);
+               interface_claim_device(if_new);
+               proto_init_interface(if_new, if_new->config);
+               interface_ip_init(if_new);
+               netifd_ubus_add_interface(if_new);
+       }
+}
+
+
+static void __init
+interface_init_list(void)
+{
+       vlist_init(&interfaces, avl_strcmp, interface_update,
+                  struct interface, node, name);
+       interfaces.keep_old = true;
+       interfaces.no_delete = true;
+}