247 lines
7.4 KiB
C
247 lines
7.4 KiB
C
/****************************************************************************
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* net/can/can_getsockopt.c
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <sys/time.h>
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#include <stdint.h>
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#include <errno.h>
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#include <assert.h>
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#include <debug.h>
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#include <netpacket/can.h>
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#include <nuttx/net/net.h>
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#include <nuttx/net/can.h>
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#include "socket/socket.h"
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#include "utils/utils.h"
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#include "can/can.h"
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#ifdef CONFIG_NET_CANPROTO_OPTIONS
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: can_getsockopt
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*
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* Description:
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* can_getsockopt() retrieves the value for the option specified by the
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* 'option' argument for the socket specified by the 'psock' argument. If
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* the size of the option value is greater than 'value_len', the value
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* stored in the object pointed to by the 'value' argument will be silently
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* truncated. Otherwise, the length pointed to by the 'value_len' argument
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* will be modified to indicate the actual length of the 'value'.
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*
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* See <sys/socket.h> a complete list of values for the socket-level
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* 'option' argument. Protocol-specific options are are protocol specific
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* header files (such as netpacket/can.h for the case of the CAN protocol).
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*
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* Input Parameters:
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* psock Socket structure of the socket to query
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* level Protocol level to set the option
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* option identifies the option to get
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* value Points to the argument value
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* value_len The length of the argument value
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*
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* Returned Value:
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* Returns zero (OK) on success. On failure, it returns a negated errno
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* value to indicate the nature of the error. See psock_getsockopt() for
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* the complete list of appropriate return error codes.
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*
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****************************************************************************/
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int can_getsockopt(FAR struct socket *psock, int level, int option,
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FAR void *value, FAR socklen_t *value_len)
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{
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FAR struct can_conn_s *conn;
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int ret = OK;
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DEBUGASSERT(value != NULL && value_len != NULL);
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conn = psock->s_conn;
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#ifdef CONFIG_NET_TIMESTAMP
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if (level == SOL_SOCKET && option == SO_TIMESTAMP)
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{
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if (*value_len != sizeof(int32_t))
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{
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return -EINVAL;
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}
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*(FAR int32_t *)value = conn->timestamp;
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return OK;
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}
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#endif
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if (level != SOL_CAN_RAW)
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{
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return -ENOPROTOOPT;
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}
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if (psock->s_type != SOCK_RAW)
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{
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nerr("ERROR: Not a RAW CAN socket\n");
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return -ENOTCONN;
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}
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switch (option)
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{
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case CAN_RAW_FILTER:
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if (*value_len % sizeof(struct can_filter) != 0)
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{
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ret = -EINVAL;
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}
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else if (*value_len > CONFIG_NET_CAN_RAW_FILTER_MAX *
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sizeof(struct can_filter))
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{
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ret = -EINVAL;
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}
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else
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{
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int count = conn->filter_count;
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int i;
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if (*value_len < count * sizeof(struct can_filter))
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{
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count = *value_len / sizeof(struct can_filter);
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}
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else
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{
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*value_len = count * sizeof(struct can_filter);
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}
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for (i = 0; i < count; i++)
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{
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((FAR struct can_filter *)value)[i] = conn->filters[i];
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}
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}
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break;
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case CAN_RAW_ERR_FILTER:
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#ifdef CONFIG_NET_CAN_ERRORS
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if (*value_len < sizeof(can_err_mask_t))
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{
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return -EINVAL;
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}
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else
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{
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FAR can_err_mask_t *mask = (FAR can_err_mask_t *)value;
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*mask = conn->err_mask;
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*value_len = sizeof(can_err_mask_t);
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}
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#endif
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break;
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case CAN_RAW_LOOPBACK:
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if (*value_len < sizeof(conn->loopback))
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{
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/* REVISIT: POSIX says that we should truncate the value if it
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* is larger than value_len. That just doesn't make sense
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* to me in this case.
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*/
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ret = -EINVAL;
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}
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else
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{
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FAR int32_t *loopback = (FAR int32_t *)value;
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*loopback = conn->loopback;
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*value_len = sizeof(conn->loopback);
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}
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break;
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case CAN_RAW_RECV_OWN_MSGS:
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if (*value_len < sizeof(conn->recv_own_msgs))
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{
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/* REVISIT: POSIX says that we should truncate the value if it
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* is larger than value_len. That just doesn't make sense
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* to me in this case.
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*/
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ret = -EINVAL;
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}
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else
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{
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FAR int32_t *recv_own_msgs = (FAR int32_t *)value;
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*recv_own_msgs = conn->recv_own_msgs;
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*value_len = sizeof(conn->recv_own_msgs);
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}
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break;
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#ifdef CONFIG_NET_CAN_CANFD
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case CAN_RAW_FD_FRAMES:
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if (*value_len < sizeof(conn->fd_frames))
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{
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/* REVISIT: POSIX says that we should truncate the value if it
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* is larger than value_len. That just doesn't make sense
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* to me in this case.
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*/
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ret = -EINVAL;
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}
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else
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{
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FAR int32_t *fd_frames = (FAR int32_t *)value;
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*fd_frames = conn->fd_frames;
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*value_len = sizeof(conn->fd_frames);
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}
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break;
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#endif
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case CAN_RAW_JOIN_FILTERS:
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break;
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#ifdef CONFIG_NET_CAN_RAW_TX_DEADLINE
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case CAN_RAW_TX_DEADLINE:
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if (*value_len < sizeof(conn->tx_deadline))
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{
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/* REVISIT: POSIX says that we should truncate the value if it
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* is larger than value_len. That just doesn't make sense
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* to me in this case.
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*/
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ret = -EINVAL;
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}
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else
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{
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FAR int32_t *tx_deadline = (FAR int32_t *)value;
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*tx_deadline = conn->tx_deadline;
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*value_len = sizeof(conn->tx_deadline);
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}
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break;
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#endif
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default:
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nerr("ERROR: Unrecognized RAW CAN socket option: %d\n", option);
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ret = -ENOPROTOOPT;
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break;
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}
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return ret;
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}
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#endif /* CONFIG_NET_CANPROTO_OPTIONS */
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