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/* -*- Mode: C; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/* SPDX-License-Identifier: LGPL-2.1-or-later */
/*
* libmbim-glib -- GLib/GIO based library to control MBIM devices
*
* Copyright (C) 2022 Daniele Palmas <dnlplm@gmail.com>
*
* Based on previous work:
* Copyright (C) 2020-2021 Eric Caruso <ejcaruso@chromium.org>
* Copyright (C) 2020-2021 Andrew Lassalle <andrewlassalle@chromium.org>
* Copyright (C) 2021 Aleksander Morgado <aleksander@aleksander.es>
*/
#include <linux/if_link.h>
#include <linux/netlink.h>
#include <linux/rtnetlink.h>
#include <sys/socket.h>
#include "mbim-helpers-netlink.h"
/*****************************************************************************/
/*
* Netlink message construction functions
*/
NetlinkHeader *
mbim_helpers_netlink_get_message_header (NetlinkMessage *msg)
{
return (NetlinkHeader *) (msg->data);
}
guint
mbim_helpers_netlink_get_pos_of_next_attr (NetlinkMessage *msg)
{
return NLMSG_ALIGN (msg->len);
}
static void
append_netlink_attribute (NetlinkMessage *msg,
gushort type,
gconstpointer value,
gushort len)
{
guint attr_len;
guint old_len;
guint next_attr_rel_pos;
char *next_attr_abs_pos;
struct rtattr new_attr;
/* Expand the buffer to hold the new attribute */
attr_len = RTA_ALIGN (RTA_LENGTH (len));
old_len = msg->len;
next_attr_rel_pos = mbim_helpers_netlink_get_pos_of_next_attr (msg);
g_byte_array_set_size (msg, next_attr_rel_pos + attr_len);
/* fill new bytes with zero, since some padding is added between attributes. */
memset ((char *) msg->data + old_len, 0, msg->len - old_len);
new_attr.rta_type = type;
new_attr.rta_len = RTA_LENGTH (len);
next_attr_abs_pos = (char *) msg->data + next_attr_rel_pos;
memcpy (next_attr_abs_pos, &new_attr, sizeof (struct rtattr));
if (value)
memcpy (RTA_DATA (next_attr_abs_pos), value, len);
/* Update the total netlink message length */
mbim_helpers_netlink_get_message_header (msg)->msghdr.nlmsg_len = msg->len;
}
void
mbim_helpers_netlink_append_attribute_nested (NetlinkMessage *msg,
gushort type)
{
append_netlink_attribute (msg, type, NULL, 0);
}
void
mbim_helpers_netlink_append_attribute_string (NetlinkMessage *msg,
gushort type,
const gchar *value)
{
append_netlink_attribute (msg, type, value, strlen (value));
}
void
mbim_helpers_netlink_append_attribute_uint16 (NetlinkMessage *msg,
gushort type,
guint16 value)
{
append_netlink_attribute (msg, type, &value, sizeof (value));
}
void
mbim_helpers_netlink_append_attribute_uint32 (NetlinkMessage *msg,
gushort type,
guint32 value)
{
append_netlink_attribute (msg, type, &value, sizeof (value));
}
NetlinkMessage *
mbim_helpers_netlink_message_new (guint16 type,
guint16 extra_flags)
{
NetlinkMessage *msg;
NetlinkHeader *hdr;
int size = sizeof (NetlinkHeader);
msg = g_byte_array_new ();
g_byte_array_set_size (msg, size);
memset ((char *) msg->data, 0, size);
hdr = mbim_helpers_netlink_get_message_header (msg);
hdr->msghdr.nlmsg_len = msg->len;
hdr->msghdr.nlmsg_type = type;
hdr->msghdr.nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK | extra_flags;
hdr->ifreq.ifi_family = AF_UNSPEC;
return msg;
}
void
mbim_helpers_netlink_message_free (NetlinkMessage *msg)
{
g_byte_array_unref (msg);
}
/*****************************************************************************/
/*
* Transaction management functions
*/
static gboolean
transaction_timed_out (NetlinkTransaction *tr,
GHashTable *transactions)
{
GTask *task;
guint32 sequence_id;
task = g_steal_pointer (&tr->completion_task);
sequence_id = tr->sequence_id;
g_hash_table_remove (transactions,
GUINT_TO_POINTER (tr->sequence_id));
g_task_return_new_error (task,
G_IO_ERROR,
G_IO_ERROR_TIMED_OUT,
"Netlink message with sequence ID %u timed out",
sequence_id);
g_object_unref (task);
return G_SOURCE_REMOVE;
}
void
mbim_helpers_netlink_transaction_complete_with_error (NetlinkTransaction *tr,
GHashTable *transactions,
GError *error)
{
GTask *task;
task = g_steal_pointer (&tr->completion_task);
g_hash_table_remove (transactions,
GUINT_TO_POINTER (tr->sequence_id));
g_task_return_error (task, error);
g_object_unref (task);
}
void
mbim_helpers_netlink_transaction_complete (NetlinkTransaction *tr,
GHashTable *transactions,
gint saved_errno)
{
GTask *task;
guint32 sequence_id;
task = g_steal_pointer (&tr->completion_task);
sequence_id = tr->sequence_id;
g_hash_table_remove (transactions,
GUINT_TO_POINTER (tr->sequence_id));
if (!saved_errno) {
g_task_return_boolean (task, TRUE);
} else {
g_task_return_new_error (task,
G_IO_ERROR,
g_io_error_from_errno (saved_errno),
"Netlink message with transaction %u failed: %s",
sequence_id,
g_strerror (saved_errno));
}
g_object_unref (task);
}
void
mbim_helpers_netlink_transaction_free (NetlinkTransaction *tr)
{
g_assert (tr->completion_task == NULL);
g_source_destroy (tr->timeout_source);
g_source_unref (tr->timeout_source);
g_slice_free (NetlinkTransaction, tr);
}
NetlinkTransaction *
mbim_helpers_netlink_transaction_new (guint *sequence_id,
GHashTable *transactions,
NetlinkMessage *msg,
guint timeout,
GTask *task)
{
NetlinkTransaction *tr;
tr = g_slice_new0 (NetlinkTransaction);
tr->sequence_id = ++(*sequence_id);
mbim_helpers_netlink_get_message_header (msg)->msghdr.nlmsg_seq = tr->sequence_id;
if (timeout) {
tr->timeout_source = g_timeout_source_new_seconds (timeout);
g_source_set_callback (tr->timeout_source,
(GSourceFunc) transaction_timed_out,
tr,
NULL);
g_source_attach (tr->timeout_source,
g_main_context_get_thread_default ());
}
tr->completion_task = g_object_ref (task);
g_hash_table_insert (transactions,
GUINT_TO_POINTER (tr->sequence_id),
tr);
return tr;
}
/*****************************************************************************/
static gboolean
netlink_message_cb (GSocket *socket,
GIOCondition condition,
GHashTable *transactions)
{
GError *error = NULL;
gchar buf[512];
int bytes_received;
unsigned int buffer_len;
struct nlmsghdr *hdr;
if (condition & G_IO_HUP || condition & G_IO_ERR) {
g_warning ("[netlink] socket connection closed.");
return G_SOURCE_REMOVE;
}
bytes_received = g_socket_receive (socket, buf, sizeof (buf), NULL, &error);
if (bytes_received < 0) {
g_warning ("[netlink] socket i/o failure: %s", error->message);
g_error_free (error);
return G_SOURCE_REMOVE;
}
buffer_len = (unsigned int ) bytes_received;
for (hdr = (struct nlmsghdr *) buf; NLMSG_OK (hdr, buffer_len);
NLMSG_NEXT (hdr, buffer_len)) {
NetlinkTransaction *tr;
struct nlmsgerr *err;
if (hdr->nlmsg_type != NLMSG_ERROR)
continue;
tr = g_hash_table_lookup (transactions,
GUINT_TO_POINTER (hdr->nlmsg_seq));
if (!tr)
continue;
err = NLMSG_DATA (buf);
mbim_helpers_netlink_transaction_complete (tr, transactions, err->error);
}
return G_SOURCE_CONTINUE;
}
void
mbim_helpers_netlink_set_callback (GSource **source,
GSocket *socket,
GHashTable *transactions)
{
*source = g_socket_create_source (socket,
G_IO_IN | G_IO_ERR | G_IO_HUP,
NULL);
g_source_set_callback (*source,
(GSourceFunc) netlink_message_cb,
transactions,
NULL);
g_source_attach (*source, g_main_context_get_thread_default ());
}
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