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incubator-nuttx/net/netlink/netlink_sockif.c

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/****************************************************************************
* net/netlink/netlink_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 "netlink/netlink.h"
#ifdef CONFIG_NET_NETLINK
/****************************************************************************
* Private Function Prototypes
****************************************************************************/
static int netlink_setup(FAR struct socket *psock);
static sockcaps_t netlink_sockcaps(FAR struct socket *psock);
static void netlink_addref(FAR struct socket *psock);
static int netlink_bind(FAR struct socket *psock,
FAR const struct sockaddr *addr, socklen_t addrlen);
static int netlink_getsockname(FAR struct socket *psock,
FAR struct sockaddr *addr,
FAR socklen_t *addrlen);
static int netlink_getpeername(FAR struct socket *psock,
FAR struct sockaddr *addr,
FAR socklen_t *addrlen);
static int netlink_connect(FAR struct socket *psock,
FAR const struct sockaddr *addr,
socklen_t addrlen);
static int netlink_poll(FAR struct socket *psock, FAR struct pollfd *fds,
bool setup);
static ssize_t netlink_sendmsg(FAR struct socket *psock,
FAR struct msghdr *msg, int flags);
static ssize_t netlink_recvmsg(FAR struct socket *psock,
FAR struct msghdr *msg, int flags);
static int netlink_close(FAR struct socket *psock);
/****************************************************************************
* Public Data
****************************************************************************/
const struct sock_intf_s g_netlink_sockif =
{
netlink_setup, /* si_setup */
netlink_sockcaps, /* si_sockcaps */
netlink_addref, /* si_addref */
netlink_bind, /* si_bind */
netlink_getsockname, /* si_getsockname */
netlink_getpeername, /* si_getpeername */
NULL, /* si_listen */
netlink_connect, /* si_connect */
NULL, /* si_accept */
netlink_poll, /* si_poll */
netlink_sendmsg, /* si_sendmsg */
netlink_recvmsg, /* si_recvmsg */
netlink_close /* si_close */
};
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Name: netlink_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.
*
* Returned Value:
* Zero (OK) is returned on success. Otherwise, a negated errno value is
* returned.
*
****************************************************************************/
static int netlink_setup(FAR struct socket *psock)
{
int domain = psock->s_domain;
int type = psock->s_type;
int proto = psock->s_proto;
/* Verify that the protocol is supported */
DEBUGASSERT((unsigned int)proto <= UINT8_MAX);
switch (proto)
{
#ifdef CONFIG_NETLINK_ROUTE
case NETLINK_ROUTE:
break;
#endif
default:
return -EPROTONOSUPPORT;
}
/* Verify the socket type (domain should always be PF_NETLINK here) */
if (domain == PF_NETLINK &&
(type == SOCK_RAW || type == SOCK_DGRAM || type == SOCK_CTRL))
{
/* Allocate the NetLink socket connection structure and save it in the
* new socket instance.
*/
FAR struct netlink_conn_s *conn = netlink_alloc();
if (conn == NULL)
{
/* Failed to reserve a connection structure */
return -ENOMEM;
}
/* 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: netlink_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 netlink_sockcaps(FAR struct socket *psock)
{
/* Permit vfcntl to set socket to non-blocking */
return SOCKCAP_NONBLOCKING;
}
/****************************************************************************
* Name: netlink_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 netlink_addref(FAR struct socket *psock)
{
FAR struct netlink_conn_s *conn;
conn = psock->s_conn;
DEBUGASSERT(conn->crefs > 0 && conn->crefs < 255);
conn->crefs++;
}
/****************************************************************************
* Name: netlink_bind
*
* Description:
* netlink_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 NetLink 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 netlink_bind(FAR struct socket *psock,
FAR const struct sockaddr *addr, socklen_t addrlen)
{
FAR struct sockaddr_nl *nladdr;
FAR struct netlink_conn_s *conn;
DEBUGASSERT(addrlen >= sizeof(struct sockaddr_nl));
/* Save the address information in the connection structure */
nladdr = (FAR struct sockaddr_nl *)addr;
conn = psock->s_conn;
conn->pid = nladdr->nl_pid ? nladdr->nl_pid : nxsched_gettid();
conn->groups = nladdr->nl_groups;
return OK;
}
/****************************************************************************
* Name: netlink_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 NetLink socket connection structure
* addr sockaddr structure to receive data [out]
* addrlen Length of sockaddr structure [in/out]
*
****************************************************************************/
static int netlink_getsockname(FAR struct socket *psock,
FAR struct sockaddr *addr,
FAR socklen_t *addrlen)
{
FAR struct sockaddr_nl *nladdr;
FAR struct netlink_conn_s *conn;
DEBUGASSERT(*addrlen >= sizeof(struct sockaddr_nl));
conn = psock->s_conn;
/* Return the address information in the address structure */
nladdr = (FAR struct sockaddr_nl *)addr;
memset(nladdr, 0, sizeof(struct sockaddr_nl));
nladdr->nl_family = AF_NETLINK;
nladdr->nl_pid = conn->pid;
nladdr->nl_groups = conn->groups;
*addrlen = sizeof(struct sockaddr_nl);
return OK;
}
/****************************************************************************
* Name: netlink_getpeername
*
* Description:
* The netlink_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 netlink_getpeername(FAR struct socket *psock,
FAR struct sockaddr *addr,
FAR socklen_t *addrlen)
{
FAR struct sockaddr_nl *nladdr;
FAR struct netlink_conn_s *conn;
DEBUGASSERT(*addrlen >= sizeof(struct sockaddr_nl));
conn = psock->s_conn;
/* Return the address information in the address structure */
nladdr = (FAR struct sockaddr_nl *)addr;
memset(nladdr, 0, sizeof(struct sockaddr_nl));
nladdr->nl_family = AF_NETLINK;
nladdr->nl_pid = conn->dst_pid;
nladdr->nl_groups = conn->dst_groups;
*addrlen = sizeof(struct sockaddr_nl);
return OK;
}
/****************************************************************************
* Name: netlink_connect
*
* Description:
* Perform a netlink connection
*
* Input Parameters:
* psock A reference to the 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 netlink_connect(FAR struct socket *psock,
FAR const struct sockaddr *addr,
socklen_t addrlen)
{
FAR struct sockaddr_nl *nladdr;
FAR struct netlink_conn_s *conn;
DEBUGASSERT(addrlen >= sizeof(struct sockaddr_nl));
/* Save the address information in the connection structure */
nladdr = (FAR struct sockaddr_nl *)addr;
conn = psock->s_conn;
conn->dst_pid = nladdr->nl_pid;
conn->dst_groups = nladdr->nl_groups;
return OK;
}
/****************************************************************************
* Name: netlink_response_available
*
* Description:
* Handle a Netlink response available notification.
*
* Input Parameters:
* Standard work handler parameters
*
* Returned Value:
* None
*
****************************************************************************/
static void netlink_response_available(FAR void *arg)
{
FAR struct netlink_conn_s *conn = arg;
DEBUGASSERT(conn != NULL);
/* The following should always be true ... but maybe not in some race
* condition?
*/
net_lock();
if (conn->fds != NULL)
{
/* Wake up the poll() with POLLIN */
poll_notify(&conn->fds, 1, POLLIN);
}
else
{
nwarn("WARNING: Missing references in connection.\n");
}
/* Allow another poll() */
conn->fds = NULL;
net_unlock();
}
/****************************************************************************
* Name: netlink_poll
*
* 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 netlink_poll(FAR struct socket *psock, FAR struct pollfd *fds,
bool setup)
{
FAR struct netlink_conn_s *conn;
int ret = OK;
conn = psock->s_conn;
/* Check if we are setting up or tearing down the poll */
if (setup)
{
/* If POLLOUT is selected, return immediately (maybe) */
pollevent_t revents = POLLOUT;
/* If POLLIN is selected and a response is available, return
* immediately (maybe).
*/
net_lock();
if (netlink_check_response(conn))
{
revents |= POLLIN;
}
/* But return ONLY if POLLIN and/or POLLIN are included in the
* requested event set.
*/
poll_notify(&fds, 1, revents);
if (fds->revents != 0)
{
net_unlock();
return OK;
}
/* Set up to be notified when a response is available if POLLIN is
* requested.
*/
if ((fds->events & POLLIN) != 0)
{
/* Some limitations: There can be only a single outstanding POLLIN
* on the Netlink connection.
*/
if (conn->fds != NULL)
{
nerr("ERROR: Multiple polls() on socket not supported.\n");
net_unlock();
return -EBUSY;
}
/* Set up the notification */
conn->fds = fds;
ret = netlink_notifier_setup(netlink_response_available,
conn, conn);
if (ret < 0)
{
nerr("ERROR: netlink_notifier_setup() failed: %d\n", ret);
conn->fds = NULL;
}
}
net_unlock();
}
else
{
/* Cancel any response notifications */
netlink_notifier_teardown(conn);
conn->fds = NULL;
}
return ret;
}
/****************************************************************************
* Name: netlink_sendmsg
*
* Description:
* If sendmsg() is used on a connection-mode (SOCK_STREAM, SOCK_SEQPACKET)
* socket, the parameters 'msg_name' and 'msg_namelen' 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 structure of the socket to be connected
* msg msg 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 sendmsg() for the list of appropriate error
* values.
*
* Assumptions:
*
****************************************************************************/
static ssize_t netlink_sendmsg(FAR struct socket *psock,
FAR struct msghdr *msg, int flags)
{
FAR const void *buf = msg->msg_iov->iov_base;
FAR const struct sockaddr *to = msg->msg_name;
socklen_t tolen = msg->msg_namelen;
FAR struct netlink_conn_s *conn;
FAR struct nlmsghdr *nlmsg;
struct sockaddr_nl nladdr;
int ret;
/* Validity check, only single iov supported */
if (msg->msg_iovlen != 1)
{
return -ENOTSUP;
}
/* Get the underlying connection structure */
conn = psock->s_conn;
if (to == NULL)
{
/* netlink_send() */
/* Format the address */
nladdr.nl_family = AF_NETLINK;
nladdr.nl_pad = 0;
nladdr.nl_pid = conn->dst_pid;
nladdr.nl_groups = conn->dst_groups;
to = (FAR const struct sockaddr *)&nladdr;
tolen = sizeof(struct sockaddr_nl);
}
DEBUGASSERT(tolen >= sizeof(struct sockaddr_nl));
/* Get a reference to the netlink message */
nlmsg = (FAR struct nlmsghdr *)buf;
DEBUGASSERT(nlmsg->nlmsg_len >= sizeof(struct nlmsghdr));
switch (psock->s_proto)
{
#ifdef CONFIG_NETLINK_ROUTE
case NETLINK_ROUTE:
ret = netlink_route_sendto(conn, nlmsg,
msg->msg_iov->iov_len, flags,
(FAR const struct sockaddr_nl *)to,
tolen);
break;
#endif
default:
ret = -EOPNOTSUPP;
break;
}
return ret;
}
/****************************************************************************
* Name: netlink_recvmsg
*
* Description:
* recvmsg() receives messages from a socket, and may be used to receive
* data on a socket whether or not it is connection-oriented.
*
* If msg_name is not NULL, and the underlying protocol provides the source
* address, this source address is filled in. The argument 'msg_namelen' is
* initialized to the size of the buffer associated with msg_name, and
* modified on return to indicate the actual size of the address stored
* there.
*
* Input Parameters:
* psock A pointer to a NuttX-specific, internal socket structure
* msg Buffer to receive the message
* flags Receive flags (ignored)
*
****************************************************************************/
static ssize_t netlink_recvmsg(FAR struct socket *psock,
FAR struct msghdr *msg, int flags)
{
FAR void *buf = msg->msg_iov->iov_base;
size_t len = msg->msg_iov->iov_len;
FAR struct sockaddr *from = msg->msg_name;
FAR socklen_t *fromlen = &msg->msg_namelen;
FAR struct netlink_response_s *entry;
FAR struct socket_conn_s *conn;
DEBUGASSERT(from == NULL ||
(fromlen != NULL && *fromlen >= sizeof(struct sockaddr_nl)));
/* Find the response to this message. The return value */
entry = netlink_tryget_response(psock->s_conn);
if (entry == NULL)
{
conn = psock->s_conn;
/* No response is variable, but presumably, one is expected. Check
* if the socket has been configured for non-blocking operation.
*/
if (_SS_ISNONBLOCK(conn->s_flags) || (flags & MSG_DONTWAIT) != 0)
{
return -EAGAIN;
}
/* Wait for the response. This should always succeed. */
entry = netlink_get_response(psock->s_conn);
DEBUGASSERT(entry != NULL);
if (entry == NULL)
{
return -EPIPE;
}
}
if (len > entry->msg.nlmsg_len)
{
len = entry->msg.nlmsg_len;
}
/* Copy the payload to the user buffer */
memcpy(buf, &entry->msg, len);
kmm_free(entry);
if (from != NULL)
{
netlink_getpeername(psock, from, fromlen);
}
return len;
}
/****************************************************************************
* Name: netlink_close
*
* Description:
* Performs the close operation on a NetLink socket instance
*
* Input Parameters:
* psock Socket instance
*
* Returned Value:
* 0 on success; -1 on error with errno set appropriately.
*
* Assumptions:
*
****************************************************************************/
static int netlink_close(FAR struct socket *psock)
{
FAR struct netlink_conn_s *conn = psock->s_conn;
int ret = OK;
/* Perform some pre-close operations for the NETLINK 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)
{
/* Free the connection structure */
conn->crefs = 0;
netlink_free(psock->s_conn);
if (ret < 0)
{
/* Return with error code, but free resources. */
nerr("ERROR: netlink_close failed: %d\n", ret);
return ret;
}
}
else
{
/* No.. Just decrement the reference count */
conn->crefs--;
}
return ret;
}
#endif /* CONFIG_NET_NETLINK */
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