337 lines
9.6 KiB
C
337 lines
9.6 KiB
C
/****************************************************************************
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* net/pkt/pkt_sockif.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/types.h>
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#include <sys/socket.h>
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#include <stdbool.h>
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#include <string.h>
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#include <assert.h>
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#include <errno.h>
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#include <debug.h>
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#include <netpacket/packet.h>
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#include <nuttx/net/net.h>
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#include <nuttx/net/netdev.h>
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#include "netdev/netdev.h"
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#include <socket/socket.h>
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#include "pkt/pkt.h"
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#ifdef CONFIG_NET_PKT
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/****************************************************************************
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* Private Function Prototypes
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****************************************************************************/
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static int pkt_setup(FAR struct socket *psock);
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static sockcaps_t pkt_sockcaps(FAR struct socket *psock);
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static void pkt_addref(FAR struct socket *psock);
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static int pkt_bind(FAR struct socket *psock,
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FAR const struct sockaddr *addr, socklen_t addrlen);
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static int pkt_close(FAR struct socket *psock);
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/****************************************************************************
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* Public Data
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****************************************************************************/
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const struct sock_intf_s g_pkt_sockif =
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{
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pkt_setup, /* si_setup */
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pkt_sockcaps, /* si_sockcaps */
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pkt_addref, /* si_addref */
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pkt_bind, /* si_bind */
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NULL, /* si_getsockname */
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NULL, /* si_getpeername */
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NULL, /* si_listen */
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NULL, /* si_connect */
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NULL, /* si_accept */
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NULL, /* si_poll */
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pkt_sendmsg, /* si_sendmsg */
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pkt_recvmsg, /* si_recvmsg */
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pkt_close /* si_close */
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};
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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/****************************************************************************
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* Name: pkt_sockif_alloc
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*
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* Description:
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* Allocate and attach a raw packet connection structure.
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*
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****************************************************************************/
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static int pkt_sockif_alloc(FAR struct socket *psock)
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{
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/* Allocate the packet socket connection structure and save in the new
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* socket instance.
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*/
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FAR struct pkt_conn_s *conn = pkt_alloc();
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if (conn == NULL)
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{
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/* Failed to reserve a connection structure */
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return -ENOMEM;
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}
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/* Set the reference count on the connection structure. This reference
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* count will be incremented only if the socket is dup'ed
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*/
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DEBUGASSERT(conn->crefs == 0);
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conn->crefs = 1;
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/* Save the pre-allocated connection in the socket structure */
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psock->s_conn = conn;
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return OK;
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}
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/****************************************************************************
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* Name: pkt_setup
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*
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* Description:
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* Called for socket() to verify that the provided socket type and
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* protocol are usable by this address family. Perform any family-
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* specific socket fields.
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*
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* Input Parameters:
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* psock A pointer to a user allocated socket structure to be
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* initialized.
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*
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* Returned Value:
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* Zero (OK) is returned on success. Otherwise, a negated errno value is
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* returned.
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*
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****************************************************************************/
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static int pkt_setup(FAR struct socket *psock)
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{
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/* Allocate the appropriate connection structure. This reserves the
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* connection structure, it is unallocated at this point. It will not
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* actually be initialized until the socket is connected.
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*
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* SOCK_RAW and SOCK_CTRL are supported.
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*/
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if (psock->s_type == SOCK_RAW || psock->s_type == SOCK_CTRL)
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{
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return pkt_sockif_alloc(psock);
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}
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else
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{
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return -EPROTONOSUPPORT;
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}
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}
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/****************************************************************************
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* Name: pkt_sockcaps
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*
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* Description:
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* Return the bit encoded capabilities of this socket.
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*
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* Input Parameters:
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* psock - Socket structure of the socket whose capabilities are being
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* queried.
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*
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* Returned Value:
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* The set of socket capabilities is returned.
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*
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****************************************************************************/
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static sockcaps_t pkt_sockcaps(FAR struct socket *psock)
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{
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return 0;
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}
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/****************************************************************************
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* Name: pkt_addref
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*
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* Description:
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* Increment the reference count on the underlying connection structure.
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*
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* Input Parameters:
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* psock - Socket structure of the socket whose reference count will be
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* incremented.
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*
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* Returned Value:
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* None
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*
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****************************************************************************/
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static void pkt_addref(FAR struct socket *psock)
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{
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FAR struct pkt_conn_s *conn;
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DEBUGASSERT(psock != NULL && psock->s_conn != NULL &&
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(psock->s_type == SOCK_RAW || psock->s_type == SOCK_CTRL));
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conn = psock->s_conn;
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DEBUGASSERT(conn->crefs > 0 && conn->crefs < 255);
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conn->crefs++;
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}
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/****************************************************************************
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* Name: pkt_bind
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*
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* Description:
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* pkt_bind() gives the socket 'psock' the local address 'addr'. 'addr'
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* is 'addrlen' bytes long. Traditionally, this is called "assigning a
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* name to a socket." When a socket is created with socket(), it exists
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* in a name space (address family) but has no name assigned.
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*
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* Input Parameters:
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* psock Socket structure of the socket to bind
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* addr Socket local address
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* addrlen Length of 'addr'
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*
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* Returned Value:
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* 0 on success; A negated errno value is returned on failure. See
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* bind() for a list a appropriate error values.
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*
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****************************************************************************/
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static int pkt_bind(FAR struct socket *psock,
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FAR const struct sockaddr *addr, socklen_t addrlen)
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{
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int ifindex;
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/* Verify that a valid address has been provided */
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if (addr->sa_family != AF_PACKET || addrlen < sizeof(struct sockaddr_ll))
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{
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nerr("ERROR: Invalid address length: %d < %zu\n",
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addrlen, sizeof(struct sockaddr_ll));
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return -EBADF;
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}
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/* Bind a raw socket to a network device. */
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if (psock->s_type == SOCK_RAW || psock->s_type == SOCK_CTRL)
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{
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FAR struct pkt_conn_s *conn = (FAR struct pkt_conn_s *)psock->s_conn;
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FAR struct net_driver_s *dev;
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/* Look at the addr and identify the network interface */
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ifindex = ((FAR struct sockaddr_ll *)addr)->sll_ifindex;
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/* Get the MAC address of that interface */
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dev = netdev_findbyindex(ifindex);
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if (dev == NULL)
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{
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return -EADDRNOTAVAIL;
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}
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/* Only Ethernet is supported */
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if (dev->d_lltype != NET_LL_ETHERNET &&
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dev->d_lltype != NET_LL_IEEE80211)
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{
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return -EAFNOSUPPORT;
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}
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/* Put ifindex and mac address into connection */
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conn->ifindex = ifindex;
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memcpy(conn->lmac, dev->d_mac.ether.ether_addr_octet, 6);
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return OK;
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}
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else
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{
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return -EBADF;
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}
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}
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/****************************************************************************
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* Name: pkt_close
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*
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* Description:
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* Performs the close operation on a raw packet socket instance
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*
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* Input Parameters:
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* psock Socket instance
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*
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* Returned Value:
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* 0 on success; a negated errno value is returned on any failure.
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*
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* Assumptions:
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*
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****************************************************************************/
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static int pkt_close(FAR struct socket *psock)
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{
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/* Perform some pre-close operations for the raw packet address type */
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switch (psock->s_type)
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{
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case SOCK_RAW:
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case SOCK_CTRL:
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{
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FAR struct pkt_conn_s *conn = psock->s_conn;
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/* Is this the last reference to the connection structure (there
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* could be more if the socket was dup'ed).
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*/
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if (conn->crefs <= 1)
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{
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/* Yes... free any read-ahead data */
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iob_free_queue(&conn->readahead);
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/* Then free the connection structure */
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conn->crefs = 0; /* No more references on the connection */
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pkt_free(psock->s_conn); /* Free network resources */
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}
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else
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{
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/* No.. Just decrement the reference count */
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conn->crefs--;
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}
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return OK;
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}
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default:
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return -EBADF;
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}
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}
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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#endif /* CONFIG_NET_PKT */
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