diff options
Diffstat (limited to 'src/devices/nm-acd-manager.c')
| -rw-r--r-- | src/devices/nm-acd-manager.c | 489 |
1 files changed, 489 insertions, 0 deletions
diff --git a/src/devices/nm-acd-manager.c b/src/devices/nm-acd-manager.c new file mode 100644 index 00000000..1bade4ff --- /dev/null +++ b/src/devices/nm-acd-manager.c @@ -0,0 +1,489 @@ +/* -*- Mode: C; tab-width: 4; indent-tabs-mode: t; c-basic-offset: 4 -*- */ +/* NetworkManager -- Network link manager + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * Copyright (C) 2015-2018 Red Hat, Inc. + */ + +#include "nm-default.h" + +#include "nm-acd-manager.h" + +#include <netinet/in.h> +#include <sys/types.h> +#include <sys/wait.h> + +#include "platform/nm-platform.h" +#include "nm-utils.h" +#include "NetworkManagerUtils.h" +#include "n-acd/src/n-acd.h" + +/*****************************************************************************/ + +typedef enum { + STATE_INIT, + STATE_PROBING, + STATE_PROBE_DONE, + STATE_ANNOUNCING, +} State; + +typedef struct { + in_addr_t address; + gboolean duplicate; + NMAcdManager *manager; + NAcd *acd; + GIOChannel *channel; + guint event_id; +} AddressInfo; + +enum { + PROBE_TERMINATED, + LAST_SIGNAL, +}; + +static guint signals[LAST_SIGNAL] = { 0 }; + +typedef struct { + int ifindex; + guint8 hwaddr[ETH_ALEN]; + State state; + GHashTable *addresses; + guint completed; +} NMAcdManagerPrivate; + +struct _NMAcdManager { + GObject parent; + NMAcdManagerPrivate _priv; +}; + +struct _NMAcdManagerClass { + GObjectClass parent; +}; + +G_DEFINE_TYPE (NMAcdManager, nm_acd_manager, G_TYPE_OBJECT) + +#define NM_ACD_MANAGER_GET_PRIVATE(self) _NM_GET_PRIVATE (self, NMAcdManager, NM_IS_ACD_MANAGER) + +/*****************************************************************************/ + +#define _NMLOG_DOMAIN LOGD_IP4 +#define _NMLOG_PREFIX_NAME "acd" +#define _NMLOG(level, ...) \ + G_STMT_START { \ + char _sbuf[64]; \ + int _ifindex = (self) ? NM_ACD_MANAGER_GET_PRIVATE (self)->ifindex : 0; \ + \ + nm_log ((level), _NMLOG_DOMAIN, \ + nm_platform_link_get_name (NM_PLATFORM_GET, _ifindex), \ + NULL, \ + "%s%s: " _NM_UTILS_MACRO_FIRST (__VA_ARGS__), \ + _NMLOG_PREFIX_NAME, \ + self ? nm_sprintf_buf (_sbuf, "[%p,%d]", self, _ifindex) : "" \ + _NM_UTILS_MACRO_REST (__VA_ARGS__)); \ + } G_STMT_END + +/*****************************************************************************/ + +static const char * +_acd_event_to_string (unsigned int event) +{ + switch (event) { + case N_ACD_EVENT_READY: + return "ready"; + case N_ACD_EVENT_USED: + return "used"; + case N_ACD_EVENT_DEFENDED: + return "defended"; + case N_ACD_EVENT_CONFLICT: + return "conflict"; + case N_ACD_EVENT_DOWN: + return "down"; + } + return NULL; +} + +#define acd_event_to_string(event) NM_UTILS_LOOKUP_STR (_acd_event_to_string, event) + +static const char * +_acd_error_to_string (int error) +{ + if (error < 0) + return strerror(-error); + + switch (error) { + case _N_ACD_E_SUCCESS: + return "success"; + case N_ACD_E_DONE: + return "no more events (engine running)"; + case N_ACD_E_STOPPED: + return "no more events (engine stopped)"; + case N_ACD_E_PREEMPTED: + return "preempted"; + case N_ACD_E_INVALID_ARGUMENT: + return "invalid argument"; + case N_ACD_E_BUSY: + return "busy"; + } + return NULL; +} + +#define acd_error_to_string(error) NM_UTILS_LOOKUP_STR (_acd_error_to_string, error) + +/*****************************************************************************/ + +/** + * nm_acd_manager_add_address: + * @self: a #NMAcdManager + * @address: an IP address + * + * Add @address to the list of IP addresses to probe. + + * Returns: %TRUE on success, %FALSE if the address was already in the list + */ +gboolean +nm_acd_manager_add_address (NMAcdManager *self, in_addr_t address) +{ + NMAcdManagerPrivate *priv; + AddressInfo *info; + + g_return_val_if_fail (NM_IS_ACD_MANAGER (self), FALSE); + priv = NM_ACD_MANAGER_GET_PRIVATE (self); + g_return_val_if_fail (priv->state == STATE_INIT, FALSE); + + if (g_hash_table_lookup (priv->addresses, GUINT_TO_POINTER (address))) + return FALSE; + + info = g_slice_new0 (AddressInfo); + info->address = address; + info->manager = self; + + g_hash_table_insert (priv->addresses, GUINT_TO_POINTER (address), info); + + return TRUE; +} + +static gboolean +acd_event (GIOChannel *source, GIOCondition condition, gpointer data) +{ + AddressInfo *info = data; + NMAcdManager *self = info->manager; + NMAcdManagerPrivate *priv = NM_ACD_MANAGER_GET_PRIVATE (self); + NAcdEvent *event; + char address_str[INET_ADDRSTRLEN]; + gs_free char *hwaddr_str = NULL; + int r; + + if ( n_acd_dispatch (info->acd) + || n_acd_pop_event (info->acd, &event)) + return G_SOURCE_CONTINUE; + + switch (event->event) { + case N_ACD_EVENT_READY: + info->duplicate = FALSE; + if (priv->state == STATE_ANNOUNCING) { + r = n_acd_announce (info->acd, N_ACD_DEFEND_ONCE); + if (r) { + _LOGW ("couldn't announce address %s on interface '%s': %s", + nm_utils_inet4_ntop (info->address, address_str), + nm_platform_link_get_name (NM_PLATFORM_GET, priv->ifindex), + acd_error_to_string (r)); + } else { + _LOGD ("announcing address %s", + nm_utils_inet4_ntop (info->address, address_str)); + } + } + break; + case N_ACD_EVENT_USED: + info->duplicate = TRUE; + break; + case N_ACD_EVENT_DEFENDED: + _LOGD ("defended address %s from host %s", + nm_utils_inet4_ntop (info->address, address_str), + (hwaddr_str = nm_utils_hwaddr_ntoa (event->defended.sender, + event->defended.n_sender))); + break; + case N_ACD_EVENT_CONFLICT: + _LOGW ("conflict for address %s detected with host %s on interface '%s'", + nm_utils_inet4_ntop (info->address, address_str), + (hwaddr_str = nm_utils_hwaddr_ntoa (event->defended.sender, + event->defended.n_sender)), + nm_platform_link_get_name (NM_PLATFORM_GET, priv->ifindex)); + break; + default: + _LOGD ("event '%s' for address %s", + acd_event_to_string (event->event), + nm_utils_inet4_ntop (info->address, address_str)); + return G_SOURCE_CONTINUE; + } + + if ( priv->state == STATE_PROBING + && ++priv->completed == g_hash_table_size (priv->addresses)) { + priv->state = STATE_PROBE_DONE; + g_signal_emit (self, signals[PROBE_TERMINATED], 0); + } + + return G_SOURCE_CONTINUE; +} + +static gboolean +acd_probe_start (NMAcdManager *self, + AddressInfo *info, + guint64 timeout) +{ + NMAcdManagerPrivate *priv = NM_ACD_MANAGER_GET_PRIVATE (self); + NAcdConfig *config; + int r, fd; + + r = n_acd_new (&info->acd); + if (r) { + _LOGW ("could not create ACD for %s on interface '%s': %s", + nm_utils_inet4_ntop (info->address, NULL), + nm_platform_link_get_name (NM_PLATFORM_GET, priv->ifindex), + acd_error_to_string (r)); + return FALSE; + } + + n_acd_get_fd (info->acd, &fd); + info->channel = g_io_channel_unix_new (fd); + info->event_id = g_io_add_watch (info->channel, G_IO_IN, acd_event, info); + + config = &(NAcdConfig) { + .ifindex = priv->ifindex, + .mac = priv->hwaddr, + .n_mac = ETH_ALEN, + .ip = info->address, + .timeout_msec = timeout, + .transport = N_ACD_TRANSPORT_ETHERNET, + }; + + r = n_acd_start (info->acd, config); + if (r) { + _LOGW ("could not start probe for %s on interface '%s': %s", + nm_utils_inet4_ntop (info->address, NULL), + nm_platform_link_get_name (NM_PLATFORM_GET, priv->ifindex), + acd_error_to_string (r)); + return FALSE; + } + + _LOGD ("start probe for %s", nm_utils_inet4_ntop (info->address, NULL)); + + return TRUE; +} + +/** + * nm_acd_manager_start_probe: + * @self: a #NMAcdManager + * @timeout: maximum probe duration in milliseconds + * @error: location to store error, or %NULL + * + * Start probing IP addresses for duplicates; when the probe terminates a + * PROBE_TERMINATED signal is emitted. + * + * Returns: %TRUE if at least one probe could be started, %FALSE otherwise + */ +gboolean +nm_acd_manager_start_probe (NMAcdManager *self, guint timeout) +{ + NMAcdManagerPrivate *priv; + GHashTableIter iter; + AddressInfo *info; + gboolean success = FALSE; + + g_return_val_if_fail (NM_IS_ACD_MANAGER (self), FALSE); + priv = NM_ACD_MANAGER_GET_PRIVATE (self); + g_return_val_if_fail (priv->state == STATE_INIT, FALSE); + + priv->completed = 0; + + g_hash_table_iter_init (&iter, priv->addresses); + while (g_hash_table_iter_next (&iter, NULL, (gpointer *) &info)) + success |= acd_probe_start (self, info, timeout); + + if (success) + priv->state = STATE_PROBING; + + return success; +} + +/** + * nm_acd_manager_reset: + * @self: a #NMAcdManager + * + * Stop any operation in progress and reset @self to the initial state. + */ +void +nm_acd_manager_reset (NMAcdManager *self) +{ + NMAcdManagerPrivate *priv; + + g_return_if_fail (NM_IS_ACD_MANAGER (self)); + priv = NM_ACD_MANAGER_GET_PRIVATE (self); + + g_hash_table_remove_all (priv->addresses); + + priv->state = STATE_INIT; +} + +/** + * nm_acd_manager_destroy: + * @self: the #NMAcdManager + * + * Calls nm_acd_manager_reset() and unrefs @self. + */ +void +nm_acd_manager_destroy (NMAcdManager *self) +{ + g_return_if_fail (NM_IS_ACD_MANAGER (self)); + + nm_acd_manager_reset (self); + g_object_unref (self); +} + +/** + * nm_acd_manager_check_address: + * @self: a #NMAcdManager + * @address: an IP address + * + * Check if an IP address is duplicate. @address must have been added with + * nm_acd_manager_add_address(). + * + * Returns: %TRUE if the address is not duplicate, %FALSE otherwise + */ +gboolean +nm_acd_manager_check_address (NMAcdManager *self, in_addr_t address) +{ + NMAcdManagerPrivate *priv; + AddressInfo *info; + + g_return_val_if_fail (NM_IS_ACD_MANAGER (self), FALSE); + priv = NM_ACD_MANAGER_GET_PRIVATE (self); + g_return_val_if_fail ( priv->state == STATE_INIT + || priv->state == STATE_PROBE_DONE, FALSE); + + info = g_hash_table_lookup (priv->addresses, GUINT_TO_POINTER (address)); + g_return_val_if_fail (info, FALSE); + + return !info->duplicate; +} + +/** + * nm_acd_manager_announce_addresses: + * @self: a #NMAcdManager + * + * Start announcing addresses. + */ +void +nm_acd_manager_announce_addresses (NMAcdManager *self) +{ + NMAcdManagerPrivate *priv = NM_ACD_MANAGER_GET_PRIVATE (self); + GHashTableIter iter; + AddressInfo *info; + int r; + + if (priv->state == STATE_INIT) { + /* n-acd can't announce without probing, therefore let's + * start a fake probe with zero timeout and then perform + * the announce. */ + priv->state = STATE_ANNOUNCING; + g_hash_table_iter_init (&iter, priv->addresses); + while (g_hash_table_iter_next (&iter, NULL, (gpointer *) &info)) { + if (!acd_probe_start (self, info, 0)) { + _LOGW ("couldn't announce address %s on interface '%s'", + nm_utils_inet4_ntop (info->address, NULL), + nm_platform_link_get_name (NM_PLATFORM_GET, priv->ifindex)); + } + } + } else if (priv->state == STATE_PROBE_DONE) { + priv->state = STATE_ANNOUNCING; + g_hash_table_iter_init (&iter, priv->addresses); + while (g_hash_table_iter_next (&iter, NULL, (gpointer *) &info)) { + if (info->duplicate) + continue; + r = n_acd_announce (info->acd, N_ACD_DEFEND_ONCE); + if (r) { + _LOGW ("couldn't announce address %s on interface '%s': %s", + nm_utils_inet4_ntop (info->address, NULL), + nm_platform_link_get_name (NM_PLATFORM_GET, priv->ifindex), + acd_error_to_string (r)); + } else + _LOGD ("announcing address %s", nm_utils_inet4_ntop (info->address, NULL)); + } + } else + nm_assert_not_reached (); +} + +static void +destroy_address_info (gpointer data) +{ + AddressInfo *info = (AddressInfo *) data; + + g_clear_pointer (&info->channel, g_io_channel_unref); + g_clear_pointer (&info->acd, n_acd_free); + nm_clear_g_source (&info->event_id); + + g_slice_free (AddressInfo, info); +} + +/*****************************************************************************/ + +static void +nm_acd_manager_init (NMAcdManager *self) +{ + NMAcdManagerPrivate *priv = NM_ACD_MANAGER_GET_PRIVATE (self); + + priv->addresses = g_hash_table_new_full (nm_direct_hash, NULL, + NULL, destroy_address_info); + priv->state = STATE_INIT; +} + +NMAcdManager * +nm_acd_manager_new (int ifindex, const guint8 *hwaddr, size_t hwaddr_len) +{ + NMAcdManager *self; + NMAcdManagerPrivate *priv; + + g_return_val_if_fail (hwaddr, NULL); + g_return_val_if_fail (hwaddr_len == ETH_ALEN, NULL); + + self = g_object_new (NM_TYPE_ACD_MANAGER, NULL); + priv = NM_ACD_MANAGER_GET_PRIVATE (self); + priv->ifindex = ifindex; + memcpy (priv->hwaddr, hwaddr, ETH_ALEN); + + return self; +} + +static void +dispose (GObject *object) +{ + NMAcdManager *self = NM_ACD_MANAGER (object); + NMAcdManagerPrivate *priv = NM_ACD_MANAGER_GET_PRIVATE (self); + + g_clear_pointer (&priv->addresses, g_hash_table_destroy); + + G_OBJECT_CLASS (nm_acd_manager_parent_class)->dispose (object); +} + +static void +nm_acd_manager_class_init (NMAcdManagerClass *klass) +{ + GObjectClass *object_class = G_OBJECT_CLASS (klass); + + object_class->dispose = dispose; + + signals[PROBE_TERMINATED] = + g_signal_new (NM_ACD_MANAGER_PROBE_TERMINATED, + G_OBJECT_CLASS_TYPE (object_class), + G_SIGNAL_RUN_FIRST, + 0, NULL, NULL, NULL, + G_TYPE_NONE, 0); +} |