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#include <string.h>
#include <stdlib.h>
#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"
#include "system.h"
struct vlist_tree interfaces;
static LIST_HEAD(iface_all_users);
enum {
IFACE_ATTR_IFNAME,
IFACE_ATTR_PROTO,
IFACE_ATTR_AUTO,
IFACE_ATTR_DEFAULTROUTE,
IFACE_ATTR_METRIC,
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 },
[IFACE_ATTR_DEFAULTROUTE] = { .name = "defaultroute", .type = BLOBMSG_TYPE_BOOL },
[IFACE_ATTR_METRIC] = { .name = "metric", .type = BLOBMSG_TYPE_INT32 },
};
const struct config_param_list interface_attr_list = {
.n_params = IFACE_ATTR_MAX,
.params = iface_attrs,
};
static void
interface_clear_errors(struct interface *iface)
{
struct interface_error *error, *tmp;
list_for_each_entry_safe(error, tmp, &iface->errors, list) {
list_del(&error->list);
free(error);
}
}
void interface_add_error(struct interface *iface, const char *subsystem,
const char *code, const char **data, int n_data)
{
struct interface_error *error;
int i, len = 0;
int *datalen = NULL;
char *dest;
if (n_data) {
len = n_data * sizeof(char *);
datalen = alloca(len);
for (i = 0; i < n_data; i++) {
datalen[i] = strlen(data[i]) + 1;
len += datalen[i];
}
}
error = calloc(1, sizeof(*error) + sizeof(char *) + len);
if (!error)
return;
list_add_tail(&error->list, &iface->errors);
error->subsystem = subsystem;
error->code = code;
dest = (char *) &error->data[n_data + 1];
for (i = 0; i < n_data; i++) {
error->data[i] = dest;
memcpy(dest, data[i], datalen[i]);
dest += datalen[i];
}
error->data[n_data] = NULL;
}
static void
interface_data_del(struct interface *iface, struct interface_data *data)
{
avl_delete(&iface->data, &data->node);
free(data);
}
static void
interface_data_flush(struct interface *iface)
{
struct interface_data *d, *tmp;
avl_for_each_element_safe(&iface->data, d, node, tmp)
interface_data_del(iface, d);
}
int
interface_add_data(struct interface *iface, const struct blob_attr *data)
{
struct interface_data *n, *o;
if (!blobmsg_check_attr(data, true))
return UBUS_STATUS_INVALID_ARGUMENT;
n = calloc(1, sizeof(*data) + blob_pad_len(data));
memcpy(n->data, data, blob_pad_len(data));
n->node.key = blobmsg_name(data);
o = avl_find_element(&iface->data, n->node.key, o, node);
if (o)
interface_data_del(iface, o);
avl_insert(&iface->data, &n->node);
return 0;
}
static void
interface_event(struct interface *iface, enum interface_event ev)
{
struct interface_user *dep, *tmp;
list_for_each_entry_safe(dep, tmp, &iface->users, list)
dep->cb(dep, iface, ev);
list_for_each_entry_safe(dep, tmp, &iface_all_users, list)
dep->cb(dep, iface, ev);
interface_queue_event(iface, ev);
}
static void
interface_flush_state(struct interface *iface)
{
if (iface->main_dev.dev)
device_release(&iface->main_dev);
if (iface->l3_dev.dev)
device_release(&iface->l3_dev);
interface_data_flush(iface);
}
static void
mark_interface_down(struct interface *iface)
{
if (iface->state == IFS_UP)
interface_event(iface, IFEV_DOWN);
interface_ip_set_enabled(&iface->config_ip, false);
interface_ip_flush(&iface->proto_ip);
interface_flush_state(iface);
system_flush_routes();
iface->state = IFS_DOWN;
}
void
__interface_set_down(struct interface *iface, bool force)
{
interface_clear_errors(iface);
if (iface->state == IFS_DOWN ||
iface->state == IFS_TEARDOWN)
return;
if (iface->state == IFS_UP)
interface_event(iface, IFEV_DOWN);
iface->state = IFS_TEARDOWN;
interface_proto_event(iface->proto, PROTO_CMD_TEARDOWN, force);
if (force)
interface_flush_state(iface);
}
static void
interface_cb(struct device_user *dep, enum device_event ev)
{
struct interface *iface;
bool new_state;
iface = container_of(dep, struct interface, main_dev);
switch (ev) {
case DEV_EVENT_ADD:
new_state = true;
break;
case DEV_EVENT_REMOVE:
new_state = false;
break;
default:
return;
}
interface_set_available(iface, new_state);
}
void
interface_set_available(struct interface *iface, bool new_state)
{
if (iface->available == new_state)
return;
D(INTERFACE, "Interface '%s', available=%d\n", iface->name, new_state);
iface->available = new_state;
if (new_state) {
if (iface->autostart && !config_init)
interface_set_up(iface);
} else
__interface_set_down(iface, true);
}
void
interface_add_user(struct interface_user *dep, struct interface *iface)
{
if (!iface) {
list_add(&dep->list, &iface_all_users);
return;
}
dep->iface = iface;
list_add(&dep->list, &iface->users);
if (iface->state == IFS_UP)
dep->cb(dep, iface, IFEV_UP);
}
void
interface_remove_user(struct interface_user *dep)
{
list_del_init(&dep->list);
dep->iface = NULL;
}
static void
interface_claim_device(struct interface *iface)
{
struct device *dev;
if (iface->ifname &&
!(iface->proto_handler->flags & PROTO_FLAG_NODEV)) {
dev = device_get(iface->ifname, true);
if (dev)
interface_set_main_dev(iface, dev);
}
if (iface->proto_handler->flags & PROTO_FLAG_INIT_AVAILABLE)
interface_set_available(iface, true);
}
static void
interface_cleanup(struct interface *iface, bool reload)
{
struct interface_user *dep, *tmp;
list_for_each_entry_safe(dep, tmp, &iface->users, list)
interface_remove_user(dep);
interface_dequeue_event(iface);
interface_ip_flush(&iface->config_ip);
interface_flush_state(iface);
interface_clear_errors(iface);
if (iface->main_dev.dev &&
(!reload || !iface->main_dev.hotplug))
interface_set_main_dev(iface, NULL);
interface_set_proto_state(iface, NULL);
}
static void
interface_do_free(struct interface *iface)
{
interface_event(iface, IFEV_FREE);
interface_cleanup(iface, false);
free(iface->config);
netifd_ubus_remove_interface(iface);
avl_delete(&interfaces.avl, &iface->node.avl);
free(iface);
}
static void
interface_do_reload(struct interface *iface)
{
interface_event(iface, IFEV_RELOAD);
interface_cleanup(iface, true);
proto_init_interface(iface, iface->config);
interface_claim_device(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);
return;
}
if (iface->autostart && iface->available)
interface_set_up(iface);
}
static void
interface_proto_cb(struct interface_proto_state *state, enum interface_proto_event ev)
{
struct interface *iface = state->iface;
switch (ev) {
case IFPEV_UP:
if (iface->state != IFS_SETUP)
return;
interface_ip_set_enabled(&iface->config_ip, true);
system_flush_routes();
iface->state = IFS_UP;
iface->start_time = system_get_rtime();
interface_event(iface, IFEV_UP);
interface_write_resolv_conf();
netifd_log_message(L_NOTICE, "Interface '%s' is now up\n", iface->name);
break;
case IFPEV_DOWN:
if (iface->state == IFS_DOWN)
return;
netifd_log_message(L_NOTICE, "Interface '%s' is now down\n", iface->name);
mark_interface_down(iface);
interface_handle_config_change(iface);
break;
case IFPEV_LINK_LOST:
if (iface->state != IFS_UP)
return;
netifd_log_message(L_NOTICE, "Interface '%s' has lost the connection\n", iface->name);
mark_interface_down(iface);
iface->state = IFS_SETUP;
break;
}
}
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->users);
INIT_LIST_HEAD(&iface->hotplug_list);
interface_ip_init(iface);
avl_init(&iface->data, avl_strcmp, false, NULL);
iface->config_ip.enabled = false;
iface->main_dev.cb = interface_cb;
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);
iface->autostart = blobmsg_get_bool_default(tb[IFACE_ATTR_AUTO], true);
iface->proto_ip.no_defaultroute =
!blobmsg_get_bool_default(tb[IFACE_ATTR_DEFAULTROUTE], true);
iface->config_autostart = iface->autostart;
}
void
interface_add(struct interface *iface, struct blob_attr *config)
{
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, iface->name);
}
void
interface_set_l3_dev(struct interface *iface, struct device *dev)
{
bool enabled = iface->config_ip.enabled;
bool claimed = iface->l3_dev.claimed;
if (iface->l3_dev.dev == dev)
return;
interface_ip_set_enabled(&iface->config_ip, false);
interface_ip_flush(&iface->proto_ip);
device_add_user(&iface->l3_dev, dev);
if (dev) {
if (claimed)
device_claim(&iface->l3_dev);
interface_ip_set_enabled(&iface->config_ip, enabled);
}
}
void
interface_set_main_dev(struct interface *iface, struct device *dev)
{
bool set_l3 = (iface->main_dev.dev == iface->l3_dev.dev);
bool claimed = iface->l3_dev.claimed;
if (iface->main_dev.dev == dev)
return;
if (set_l3)
interface_set_l3_dev(iface, dev);
device_add_user(&iface->main_dev, dev);
if (claimed)
device_claim(&iface->l3_dev);
if (!iface->l3_dev.dev)
interface_set_l3_dev(iface, dev);
}
int
interface_remove_link(struct interface *iface, struct device *dev)
{
struct device *mdev = iface->main_dev.dev;
if (mdev && mdev->hotplug_ops)
return mdev->hotplug_ops->del(mdev, dev);
if (!iface->main_dev.hotplug)
return UBUS_STATUS_INVALID_ARGUMENT;
if (dev != iface->main_dev.dev)
return UBUS_STATUS_INVALID_ARGUMENT;
device_remove_user(&iface->main_dev);
return 0;
}
int
interface_add_link(struct interface *iface, struct device *dev)
{
struct device *mdev = iface->main_dev.dev;
if (mdev == dev)
return 0;
if (iface->main_dev.hotplug)
device_remove_user(&iface->main_dev);
if (mdev) {
if (mdev->hotplug_ops)
return mdev->hotplug_ops->add(mdev, dev);
else
return UBUS_STATUS_NOT_SUPPORTED;
}
interface_set_main_dev(iface, dev);
iface->main_dev.hotplug = true;
return 0;
}
int
interface_set_up(struct interface *iface)
{
int ret;
iface->autostart = true;
if (iface->state != IFS_DOWN)
return 0;
interface_clear_errors(iface);
if (!iface->available) {
interface_add_error(iface, "interface", "NO_DEVICE", NULL, 0);
return -1;
}
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;
}
return 0;
}
int
interface_set_down(struct interface *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);
}
void
interface_update_start(struct interface *iface)
{
interface_ip_update_start(&iface->proto_ip);
}
void
interface_update_complete(struct interface *iface)
{
interface_ip_update_complete(&iface->proto_ip);
}
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 ((!!old_ifname != !!if_new->ifname) ||
(old_ifname && 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;
}
#define UPDATE(field) ({ \
bool __changed = (if_old->field != if_new->field); \
if_old->field = if_new->field; \
__changed; \
})
if (UPDATE(metric) || UPDATE(proto_ip.no_defaultroute)) {
interface_ip_set_enabled(&if_old->config_ip, false);
interface_ip_set_enabled(&if_old->config_ip, if_new->config_ip.enabled);
interface_ip_set_enabled(&if_old->proto_ip, false);
interface_ip_set_enabled(&if_old->proto_ip, if_new->proto_ip.enabled);
}
#undef UPDATE
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);
proto_init_interface(if_new, if_new->config);
interface_claim_device(if_new);
netifd_ubus_add_interface(if_new);
}
}
static void __init
interface_init_list(void)
{
vlist_init(&interfaces, avl_strcmp, interface_update);
interfaces.keep_old = true;
interfaces.no_delete = true;
}
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