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nuttx/net/can/can_sockif.c
Abdelatif Guettouche 6385408483 net/: Correct some comments. 
Signed-off-by: Abdelatif Guettouche <abdelatif.guettouche@espressif.com>
2021-01-15 16:23:12 -05:00

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/****************************************************************************
* net/can/can_sockif.c
*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership. The
* ASF licenses this file to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance with the
* License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations
* under the License.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <stdbool.h>
#include <string.h>
#include <poll.h>
#include <sched.h>
#include <assert.h>
#include <errno.h>
#include <debug.h>
#include <nuttx/kmalloc.h>
#include <nuttx/semaphore.h>
#include <nuttx/wqueue.h>
#include <nuttx/net/net.h>
#include "can/can.h"
#include "netdev/netdev.h"
#ifdef CONFIG_NET_CAN
/****************************************************************************
* Private Function Prototypes
****************************************************************************/
static int can_setup(FAR struct socket *psock, int protocol);
static sockcaps_t can_sockcaps(FAR struct socket *psock);
static void can_addref(FAR struct socket *psock);
static int can_bind(FAR struct socket *psock,
FAR const struct sockaddr *addr, socklen_t addrlen);
static int can_getsockname(FAR struct socket *psock,
FAR struct sockaddr *addr, FAR socklen_t *addrlen);
static int can_getpeername(FAR struct socket *psock,
FAR struct sockaddr *addr, FAR socklen_t *addrlen);
static int can_listen(FAR struct socket *psock, int backlog);
static int can_connect(FAR struct socket *psock,
FAR const struct sockaddr *addr, socklen_t addrlen);
static int can_accept(FAR struct socket *psock, FAR struct sockaddr *addr,
FAR socklen_t *addrlen, FAR struct socket *newsock);
static int can_poll_local(FAR struct socket *psock, FAR struct pollfd *fds,
bool setup);
static ssize_t can_send(FAR struct socket *psock,
FAR const void *buf, size_t len, int flags);
static ssize_t can_sendto(FAR struct socket *psock, FAR const void *buf,
size_t len, int flags, FAR const struct sockaddr *to,
socklen_t tolen);
#ifdef CONFIG_NET_CMSG
static ssize_t can_sendmsg(FAR struct socket *psock, FAR struct msghdr *msg,
int flags);
#endif
static int can_close(FAR struct socket *psock);
/****************************************************************************
* Public Data
****************************************************************************/
const struct sock_intf_s g_can_sockif =
{
can_setup, /* si_setup */
can_sockcaps, /* si_sockcaps */
can_addref, /* si_addref */
can_bind, /* si_bind */
can_getsockname, /* si_getsockname */
can_getpeername, /* si_getpeername */
can_listen, /* si_listen */
can_connect, /* si_connect */
can_accept, /* si_accept */
can_poll_local, /* si_poll */
can_send, /* si_send */
can_sendto, /* si_sendto */
#ifdef CONFIG_NET_SENDFILE
NULL, /* si_sendfile */
#endif
can_recvfrom, /* si_recvfrom */
#ifdef CONFIG_NET_CMSG
can_recvmsg, /* si_recvmsg */
can_sendmsg, /* si_sendmsg */
#endif
can_close /* si_close */
};
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Name: can_poll_eventhandler
*
* Description:
* This function is called to perform the actual CAN receive operation
* via the device interface layer. from can_input()
*
* Input Parameters:
* dev The structure of the network driver that caused the event
* conn The connection structure associated with the socket
* flags Set of events describing why the callback was invoked
*
* Returned Value:
* None
*
* Assumptions:
* This function must be called with the network locked.
*
****************************************************************************/
static uint16_t can_poll_eventhandler(FAR struct net_driver_s *dev,
FAR void *conn,
FAR void *pvpriv, uint16_t flags)
{
FAR struct can_poll_s *info = (FAR struct can_poll_s *)pvpriv;
DEBUGASSERT(!info || (info->psock && info->fds));
/* 'priv' might be null in some race conditions (?) */
if (info)
{
pollevent_t eventset = 0;
/* Check for data or connection availability events. */
if ((flags & CAN_NEWDATA) != 0)
{
eventset |= (POLLIN & info->fds->events);
}
/* Check for loss of connection events. */
if ((flags & NETDEV_DOWN) != 0)
{
eventset |= (POLLHUP | POLLERR);
}
#if 0
/* A poll is a sign that we are free to send data. */
else if ((flags & CAN_POLL) != 0 &&
psock_udp_cansend(info->psock) >= 0)
{
eventset |= (POLLOUT & info->fds->events);
}
#endif
/* Awaken the caller of poll() is requested event occurred. */
if (eventset)
{
info->fds->revents |= eventset;
nxsem_post(info->fds->sem);
}
}
return flags;
}
/****************************************************************************
* Name: can_setup
*
* Description:
* Called for socket() to verify that the provided socket type and
* protocol are usable by this address family. Perform any family-
* specific socket fields.
*
* Input Parameters:
* psock - A pointer to a user allocated socket structure to be
* initialized.
* protocol - CAN socket protocol (see sys/socket.h)
*
* Returned Value:
* Zero (OK) is returned on success. Otherwise, a negated errno value is
* returned.
*
****************************************************************************/
static int can_setup(FAR struct socket *psock, int protocol)
{
int domain = psock->s_domain;
int type = psock->s_type;
/* Verify that the protocol is supported */
DEBUGASSERT((unsigned int)protocol <= UINT8_MAX);
switch (protocol)
{
case 0: /* INET subsystem for netlib_ifup */
case CAN_RAW: /* RAW sockets */
case CAN_BCM: /* Broadcast Manager */
case CAN_TP16: /* VAG Transport Protocol v1.6 */
case CAN_TP20: /* VAG Transport Protocol v2.0 */
case CAN_MCNET: /* Bosch MCNet */
case CAN_ISOTP: /* ISO 15765-2 Transport Protocol */
case CAN_J1939: /* SAE J1939 */
break;
default:
return -EPROTONOSUPPORT;
}
/* Verify the socket type (domain should always be PF_CAN here) */
if (domain == PF_CAN && (type == SOCK_RAW || type == SOCK_DGRAM))
{
/* Allocate the CAN socket connection structure and save it in the
* new socket instance.
*/
FAR struct can_conn_s *conn = can_alloc();
if (conn == NULL)
{
/* Failed to reserve a connection structure */
return -ENOMEM;
}
#ifdef CONFIG_NET_TIMESTAMP
/* Store psock in conn se we can read the SO_TIMESTAMP value */
conn->psock = psock;
#endif
/* Initialize the connection instance */
conn->protocol = (uint8_t)protocol;
/* Set the reference count on the connection structure. This
* reference count will be incremented only if the socket is
* dup'ed
*/
conn->crefs = 1;
/* Attach the connection instance to the socket */
psock->s_conn = conn;
return OK;
}
return -EPROTONOSUPPORT;
}
/****************************************************************************
* Name: can_sockcaps
*
* Description:
* Return the bit encoded capabilities of this socket.
*
* Input Parameters:
* psock - Socket structure of the socket whose capabilities are being
* queried.
*
* Returned Value:
* The non-negative set of socket capabilities is returned.
*
****************************************************************************/
static sockcaps_t can_sockcaps(FAR struct socket *psock)
{
/* Permit vfcntl to set socket to non-blocking */
return SOCKCAP_NONBLOCKING;
}
/****************************************************************************
* Name: can_addref
*
* Description:
* Increment the reference count on the underlying connection structure.
*
* Input Parameters:
* psock - Socket structure of the socket whose reference count will be
* incremented.
*
* Returned Value:
* None
*
****************************************************************************/
static void can_addref(FAR struct socket *psock)
{
FAR struct can_conn_s *conn;
DEBUGASSERT(psock != NULL && psock->s_conn != NULL);
conn = psock->s_conn;
DEBUGASSERT(conn->crefs > 0 && conn->crefs < 255);
conn->crefs++;
}
/****************************************************************************
* Name: can_bind
*
* Description:
* can_bind() gives the socket 'conn' the local address 'addr'. 'addr'
* is 'addrlen' bytes long. Traditionally, this is called "assigning a name
* to a socket." When a socket is created with socket, it exists in a name
* space (address family) but has no name assigned.
*
* Input Parameters:
* conn CAN socket connection structure
* addr Socket local address
* addrlen Length of 'addr'
*
* Returned Value:
* 0 on success; -1 on error with errno set appropriately
*
* EACCES
* The address is protected, and the user is not the superuser.
* EADDRINUSE
* The given address is already in use.
* EINVAL
* The socket is already bound to an address.
* ENOTSOCK
* psock is a descriptor for a file, not a socket.
*
* Assumptions:
*
****************************************************************************/
static int can_bind(FAR struct socket *psock,
FAR const struct sockaddr *addr, socklen_t addrlen)
{
FAR struct sockaddr_can *canaddr;
FAR struct can_conn_s *conn;
DEBUGASSERT(psock != NULL && psock->s_conn != NULL && addr != NULL &&
addrlen >= sizeof(struct sockaddr_can));
/* Save the address information in the connection structure */
canaddr = (FAR struct sockaddr_can *)addr;
conn = (FAR struct can_conn_s *)psock->s_conn;
/* Bind CAN device to socket */
#ifdef CONFIG_NETDEV_IFINDEX
conn->dev = netdev_findbyindex(canaddr->can_ifindex);
#else
char netdev_name[5] = "can0";
netdev_name[3] += canaddr->can_ifindex;
conn->dev = netdev_findbyname((const char *)&netdev_name);
#endif
return OK;
}
/****************************************************************************
* Name: can_getsockname
*
* Description:
* The getsockname() function retrieves the locally-bound name of the
* specified socket, stores this address in the sockaddr structure pointed
* to by the 'addr' argument, and stores the length of this address in the
* object pointed to by the 'addrlen' argument.
*
* If the actual length of the address is greater than the length of the
* supplied sockaddr structure, the stored address will be truncated.
*
* If the socket has not been bound to a local name, the value stored in
* the object pointed to by address is unspecified.
*
* Input Parameters:
* conn CAN socket connection structure
* addr sockaddr structure to receive data [out]
* addrlen Length of sockaddr structure [in/out]
*
****************************************************************************/
static int can_getsockname(FAR struct socket *psock,
FAR struct sockaddr *addr,
FAR socklen_t *addrlen)
{
return -EAFNOSUPPORT;
}
/****************************************************************************
* Name: can_getpeername
*
* Description:
* The can_getpeername() function retrieves the remote-connected name
* of the specified packet socket, stores this address in the sockaddr
* structure pointed to by the 'addr' argument, and stores the length of
* this address in the object pointed to by the 'addrlen' argument.
*
* If the actual length of the address is greater than the length of the
* supplied sockaddr structure, the stored address will be truncated.
*
* If the socket has not been bound to a local name, the value stored in
* the object pointed to by address is unspecified.
*
* Parameters:
* psock Socket structure of the socket to be queried
* addr sockaddr structure to receive data [out]
* addrlen Length of sockaddr structure [in/out]
*
* Returned Value:
* On success, 0 is returned, the 'addr' argument points to the address
* of the socket, and the 'addrlen' argument points to the length of the
* address. Otherwise, a negated errno value is returned. See
* getpeername() for the list of appropriate error numbers.
*
****************************************************************************/
static int can_getpeername(FAR struct socket *psock,
FAR struct sockaddr *addr,
FAR socklen_t *addrlen)
{
return -EOPNOTSUPP;
}
/****************************************************************************
* Name: can_listen
*
* Description:
* To accept connections, a socket is first created with psock_socket(), a
* willingness to accept incoming connections and a queue limit for
* incoming connections are specified with psock_listen(), and then the
* connections are accepted with psock_accept(). For the case of AFINET
* and AFINET6 sockets, psock_listen() calls this function. The
* psock_listen() call applies only to sockets of type SOCK_STREAM or
* SOCK_SEQPACKET.
*
* Input Parameters:
* psock Reference to an internal, bound socket structure.
* backlog The maximum length the queue of pending connections may grow.
* If a connection request arrives with the queue full, the client
* may receive an error with an indication of ECONNREFUSED or,
* if the underlying protocol supports retransmission, the request
* may be ignored so that retries succeed.
*
* Returned Value:
* On success, zero is returned. On error, a negated errno value is
* returned. See listen() for the set of appropriate error values.
*
****************************************************************************/
static int can_listen(FAR struct socket *psock, int backlog)
{
return -EOPNOTSUPP;
}
/****************************************************************************
* Name: can_connect
*
* Description:
* Perform a can connection
*
* Input Parameters:
* psock A reference to the socket structure of the socket
* to be connected
* addr The address of the remote server to connect to
* addrlen Length of address buffer
*
* Returned Value:
* None
*
* Assumptions:
*
****************************************************************************/
static int can_connect(FAR struct socket *psock,
FAR const struct sockaddr *addr,
socklen_t addrlen)
{
return -EOPNOTSUPP;
}
/****************************************************************************
* Name: can_accept
*
* Description:
* The can_accept function is used with connection-based socket
* types (SOCK_STREAM, SOCK_SEQPACKET and SOCK_RDM). It extracts the first
* connection request on the queue of pending connections, creates a new
* connected socket with mostly the same properties as 'sockfd', and
* allocates a new socket descriptor for the socket, which is returned. The
* newly created socket is no longer in the listening state. The original
* socket 'sockfd' is unaffected by this call. Per file descriptor flags
* are not inherited across an inet_accept.
*
* The 'sockfd' argument is a socket descriptor that has been created with
* socket(), bound to a local address with bind(), and is listening for
* connections after a call to listen().
*
* On return, the 'addr' structure is filled in with the address of the
* connecting entity. The 'addrlen' argument initially contains the size
* of the structure pointed to by 'addr'; on return it will contain the
* actual length of the address returned.
*
* If no pending connections are present on the queue, and the socket is
* not marked as non-blocking, inet_accept blocks the caller until a
* connection is present. If the socket is marked non-blocking and no
* pending connections are present on the queue, inet_accept returns
* EAGAIN.
*
* Input Parameters:
* psock Reference to the listening socket structure
* addr Receives the address of the connecting client
* addrlen Input: Allocated size of 'addr'
* Return: Actual size returned size of 'addr'
* newsock Location to return the accepted socket information.
*
* Returned Value:
* Returns 0 (OK) on success. On failure, it returns a negated errno
* value. See accept() for a description of the appropriate error value.
*
* Assumptions:
* The network is locked.
*
****************************************************************************/
static int can_accept(FAR struct socket *psock, FAR struct sockaddr *addr,
FAR socklen_t *addrlen, FAR struct socket *newsock)
{
return -EOPNOTSUPP;
}
/****************************************************************************
* Name: can_poll_local
*
* Description:
* The standard poll() operation redirects operations on socket descriptors
* to this function.
*
* POLLUP: Will never be reported
* POLLERR: Reported in the event of any failure.
* POLLOUT: Always reported if requested.
* POLLIN: Reported if requested but only when pending response data is
* available
*
* Input Parameters:
* psock - An instance of the internal socket structure.
* fds - The structure describing the events to be monitored.
* setup - true: Setup up the poll; false: Tear down the poll
*
* Returned Value:
* 0: Success; Negated errno on failure
*
****************************************************************************/
static int can_poll_local(FAR struct socket *psock, FAR struct pollfd *fds,
bool setup)
{
FAR struct can_conn_s *conn;
FAR struct can_poll_s *info;
FAR struct devif_callback_s *cb;
int ret = OK;
DEBUGASSERT(psock != NULL && psock->s_conn != NULL);
conn = (FAR struct can_conn_s *)psock->s_conn;
info = conn->pollinfo;
/* FIXME add NETDEV_DOWN support */
/* Check if we are setting up or tearing down the poll */
if (setup)
{
net_lock();
info->dev = conn->dev;
cb = can_callback_alloc(info->dev, conn);
if (cb == NULL)
{
ret = -EBUSY;
goto errout_with_lock;
}
/* Initialize the poll info container */
info->psock = psock;
info->fds = fds;
info->cb = cb;
/* Initialize the callback structure. Save the reference to the info
* structure as callback private data so that it will be available
* during callback processing.
*/
cb->flags = NETDEV_DOWN;
cb->priv = (FAR void *)info;
cb->event = can_poll_eventhandler;
if ((fds->events & POLLOUT) != 0)
{
cb->flags |= CAN_POLL;
}
if ((fds->events & POLLIN) != 0)
{
cb->flags |= CAN_NEWDATA;
}
/* Save the reference in the poll info structure as fds private as well
* for use during poll teardown as well.
*/
fds->priv = (FAR void *)info;
/* Check for read data availability now */
if (!IOB_QEMPTY(&conn->readahead))
{
/* Normal data may be read without blocking. */
fds->revents |= (POLLRDNORM & fds->events);
}
#if 0
if (psock_udp_cansend(psock) >= 0)
{
/* Normal data may be sent without blocking (at least one byte). */
fds->revents |= (POLLWRNORM & fds->events);
}
#endif
/* Check if any requested events are already in effect */
if (fds->revents != 0)
{
/* Yes.. then signal the poll logic */
nxsem_post(fds->sem);
}
errout_with_lock:
net_unlock();
}
else
{
info = (FAR struct can_poll_s *)fds->priv;
if (info != NULL)
{
/* Cancel any response notifications */
can_callback_free(info->dev, conn, info->cb);
/* Release the poll/select data slot */
info->fds->priv = NULL;
/* Then free the poll info container */
info->psock = NULL;
}
}
return ret;
}
/****************************************************************************
* Name: can_send
*
* Description:
* The can_send() call may be used only when the socket is in
* a connected state (so that the intended recipient is known).
*
* Input Parameters:
* psock - An instance of the internal socket structure.
* buf - Data to send
* len - Length of data to send
* flags - Send flags (ignored)
*
* Returned Value:
* On success, returns the number of characters sent. On error, a negated
* errno value is returned (see send() for the list of appropriate error
* values.
*
****************************************************************************/
static ssize_t can_send(FAR struct socket *psock, FAR const void *buf,
size_t len, int flags)
{
ssize_t ret;
/* Only SOCK_RAW is supported */
if (psock->s_type == SOCK_RAW)
{
/* Raw packet send */
ret = psock_can_send(psock, buf, len);
}
else
{
/* EDESTADDRREQ. Signifies that the socket is not connection-mode and
* no peer address is set.
*/
ret = -EDESTADDRREQ;
}
return ret;
}
/****************************************************************************
* Name: can_sendto
*
* Description:
* If sendto() is used on a connection-mode (SOCK_STREAM, SOCK_SEQPACKET)
* socket, the parameters to and 'tolen' are ignored (and the error EISCONN
* may be returned when they are not NULL and 0), and the error ENOTCONN is
* returned when the socket was not actually connected.
*
* Input Parameters:
* psock A reference to the socket structure of the socket
* to be connected
* buf Data to send
* len Length of data to send
* flags Send flags (ignored)
* to Address of recipient
* tolen The length of the address structure
*
* Returned Value:
* None
*
* Assumptions:
*
****************************************************************************/
static ssize_t can_sendto(FAR struct socket *psock, FAR const void *buf,
size_t len, int flags,
FAR const struct sockaddr *to, socklen_t tolen)
{
nerr("ERROR: sendto() not supported for raw packet sockets\n");
return -EAFNOSUPPORT;
}
/****************************************************************************
* Name: can_sendmsg
*
* Description:
* The can_sendmsg() send a CAN frame to psock
*
* Input Parameters:
* psock - An instance of the internal socket structure.
* msg - CAN frame and optional CMSG
* flags - Send flags (ignored)
*
* Returned Value:
* On success, returns the number of characters sent. On error, a negated
* errno value is returned (see send() for the list of appropriate error
* values.
*
****************************************************************************/
#ifdef CONFIG_NET_CMSG
static ssize_t can_sendmsg(FAR struct socket *psock, FAR struct msghdr *msg,
int flags)
{
ssize_t ret;
/* Only SOCK_RAW is supported */
if (psock->s_type == SOCK_RAW)
{
/* Raw packet send */
ret = psock_can_sendmsg(psock, msg);
}
else
{
/* EDESTADDRREQ. Signifies that the socket is not connection-mode and
* no peer address is set.
*/
ret = -EDESTADDRREQ;
}
return ret;
}
#endif
/****************************************************************************
* Name: can_close
*
* Description:
* Performs the close operation on a CAN socket instance
*
* Input Parameters:
* psock Socket instance
*
* Returned Value:
* 0 on success; -1 on error with errno set appropriately.
*
* Assumptions:
*
****************************************************************************/
static int can_close(FAR struct socket *psock)
{
FAR struct can_conn_s *conn = psock->s_conn;
int ret = OK;
/* Perform some pre-close operations for the CAN socket type. */
/* Is this the last reference to the connection structure (there
* could be more if the socket was dup'ed).
*/
if (conn->crefs <= 1)
{
/* Yes... inform user-space daemon of socket close. */
#warning Missing logic
/* Free the connection structure */
conn->crefs = 0;
can_free(psock->s_conn);
if (ret < 0)
{
/* Return with error code, but free resources. */
nerr("ERROR: can_close failed: %d\n", ret);
return ret;
}
}
else
{
/* No.. Just decrement the reference count */
conn->crefs--;
}
return ret;
}
#endif /* CONFIG_NET_CAN */
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