/****************************************************************************
* net/pkt/pkt_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 <assert.h>
#include <errno.h>
#include <debug.h>
#include <netpacket/packet.h>
#include <nuttx/net/net.h>
#include <nuttx/net/netdev.h>
#include "netdev/netdev.h"
#include <socket/socket.h>
#include "pkt/pkt.h"
#ifdef CONFIG_NET_PKT
/****************************************************************************
* Private Function Prototypes
****************************************************************************/
static int pkt_setup(FAR struct socket *psock, int protocol);
static sockcaps_t pkt_sockcaps(FAR struct socket *psock);
static void pkt_addref(FAR struct socket *psock);
static int pkt_bind(FAR struct socket *psock,
FAR const struct sockaddr *addr, socklen_t addrlen);
static int pkt_getsockname(FAR struct socket *psock,
FAR struct sockaddr *addr, FAR socklen_t *addrlen);
static int pkt_getpeername(FAR struct socket *psock,
FAR struct sockaddr *addr, FAR socklen_t *addrlen);
static int pkt_listen(FAR struct socket *psock, int backlog);
static int pkt_connect(FAR struct socket *psock,
FAR const struct sockaddr *addr, socklen_t addrlen);
static int pkt_accept(FAR struct socket *psock,
FAR struct sockaddr *addr, FAR socklen_t *addrlen,
FAR struct socket *newsock);
static int pkt_poll_local(FAR struct socket *psock,
FAR struct pollfd *fds, bool setup);
static int pkt_close(FAR struct socket *psock);
/****************************************************************************
* Public Data
****************************************************************************/
const struct sock_intf_s g_pkt_sockif =
{
pkt_setup, /* si_setup */
pkt_sockcaps, /* si_sockcaps */
pkt_addref, /* si_addref */
pkt_bind, /* si_bind */
pkt_getsockname, /* si_getsockname */
pkt_getpeername, /* si_getpeername */
pkt_listen, /* si_listen */
pkt_connect, /* si_connect */
pkt_accept, /* si_accept */
pkt_poll_local, /* si_poll */
pkt_sendmsg, /* si_sendmsg */
pkt_recvmsg, /* si_recvmsg */
pkt_close /* si_close */
};
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Name: pkt_sockif_alloc
*
* Description:
* Allocate and attach a raw packet connection structure.
*
****************************************************************************/
static int pkt_sockif_alloc(FAR struct socket *psock)
{
/* Allocate the packet socket connection structure and save in the new
* socket instance.
*/
FAR struct pkt_conn_s *conn = pkt_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
*/
DEBUGASSERT(conn->crefs == 0);
conn->crefs = 1;
/* Save the pre-allocated connection in the socket structure */
psock->s_conn = conn;
return OK;
}
/****************************************************************************
* Name: pkt_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 (see sys/socket.h)
*
* Returned Value:
* Zero (OK) is returned on success. Otherwise, a negated errno value is
* returned.
*
****************************************************************************/
static int pkt_setup(FAR struct socket *psock, int protocol)
{
/* Allocate the appropriate connection structure. This reserves the
* connection structure, it is unallocated at this point. It will not
* actually be initialized until the socket is connected.
*
* Only SOCK_RAW is supported.
*/
if (psock->s_type == SOCK_RAW)
{
return pkt_sockif_alloc(psock);
}
else
{
return -EPROTONOSUPPORT;
}
}
/****************************************************************************
* Name: pkt_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 set of socket capabilities is returned.
*
****************************************************************************/
static sockcaps_t pkt_sockcaps(FAR struct socket *psock)
{
return 0;
}
/****************************************************************************
* Name: pkt_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 pkt_addref(FAR struct socket *psock)
{
FAR struct pkt_conn_s *conn;
DEBUGASSERT(psock != NULL && psock->s_conn != NULL &&
psock->s_type == SOCK_RAW);
conn = psock->s_conn;
DEBUGASSERT(conn->crefs > 0 && conn->crefs < 255);
conn->crefs++;
}
/****************************************************************************
* Name: pkt_connect
*
* Description:
* pkt_connect() connects the local socket referred to by the structure
* 'psock' to the address specified by 'addr'. The addrlen argument
* specifies the size of 'addr'. The format of the address in 'addr' is
* determined by the address space of the socket 'psock'.
*
* If the socket 'psock' is of type SOCK_DGRAM then 'addr' is the address
* to which datagrams are sent by default, and the only address from which
* datagrams are received. If the socket is of type SOCK_STREAM or
* SOCK_SEQPACKET, this call attempts to make a connection to the socket
* that is bound to the address specified by 'addr'.
*
* Generally, connection-based protocol sockets may successfully
* pkt_connect() only once; connectionless protocol sockets may use
* pkt_connect() multiple times to change their association.
* Connectionless sockets may dissolve the association by connecting to
* an address with the sa_family member of sockaddr set to AF_UNSPEC.
*
* Input Parameters:
* psock Pointer to a socket structure initialized by psock_socket()
* addr Server address (form depends on type of socket)
* addrlen Length of actual 'addr'
*
* Returned Value:
* 0 on success; a negated errno value on failure. See connect() for the
* list of appropriate errno values to be returned.
*
****************************************************************************/
static int pkt_connect(FAR struct socket *psock,
FAR const struct sockaddr *addr, socklen_t addrlen)
{
return -EAFNOSUPPORT;
}
/****************************************************************************
* Name: pkt_accept
*
* Description:
* The pkt_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 pkt_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, pkt_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, pkt_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: 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 pkt_accept(FAR struct socket *psock, FAR struct sockaddr *addr,
FAR socklen_t *addrlen, FAR struct socket *newsock)
{
return -EAFNOSUPPORT;
}
/****************************************************************************
* Name: pkt_bind
*
* Description:
* pkt_bind() gives the socket 'psock' 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:
* psock Socket structure of the socket to bind
* addr Socket local address
* addrlen Length of 'addr'
*
* Returned Value:
* 0 on success; A negated errno value is returned on failure. See
* bind() for a list a appropriate error values.
*
****************************************************************************/
static int pkt_bind(FAR struct socket *psock,
FAR const struct sockaddr *addr, socklen_t addrlen)
{
int ifindex;
/* Verify that a valid address has been provided */
if (addr->sa_family != AF_PACKET || addrlen < sizeof(struct sockaddr_ll))
{
nerr("ERROR: Invalid address length: %d < %zu\n",
addrlen, sizeof(struct sockaddr_ll));
return -EBADF;
}
/* Bind a raw socket to a network device. */
if (psock->s_type == SOCK_RAW)
{
FAR struct pkt_conn_s *conn = (FAR struct pkt_conn_s *)psock->s_conn;
FAR struct net_driver_s *dev;
/* Look at the addr and identify the network interface */
ifindex = ((FAR struct sockaddr_ll *)addr)->sll_ifindex;
/* Get the MAC address of that interface */
dev = netdev_findbyindex(ifindex);
if (dev == NULL)
{
return -EADDRNOTAVAIL;
}
/* Only Ethernet is supported */
if (dev->d_lltype != NET_LL_ETHERNET &&
dev->d_lltype != NET_LL_IEEE80211)
{
return -EAFNOSUPPORT;
}
/* Put ifindex and mac address into connection */
conn->ifindex = ifindex;
memcpy(conn->lmac, dev->d_mac.ether.ether_addr_octet, 6);
return OK;
}
else
{
return -EBADF;
}
}
/****************************************************************************
* Name: pkt_getsockname
*
* Description:
* The pkt_getsockname() function retrieves the locally-bound 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.
*
* Input 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
* getsockname() for the list of appropriate error numbers.
*
****************************************************************************/
static int pkt_getsockname(FAR struct socket *psock,
FAR struct sockaddr *addr, FAR socklen_t *addrlen)
{
return -EAFNOSUPPORT;
}
/****************************************************************************
* Name: pkt_getpeername
*
* Description:
* The pkt_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 pkt_getpeername(FAR struct socket *psock,
FAR struct sockaddr *addr, FAR socklen_t *addrlen)
{
return -EAFNOSUPPORT;
}
/****************************************************************************
* Name: pkt_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 raw
* packet 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, boound 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.
*
****************************************************************************/
int pkt_listen(FAR struct socket *psock, int backlog)
{
return -EOPNOTSUPP;
}
/****************************************************************************
* Name: pkt_poll
*
* Description:
* The standard poll() operation redirects operations on socket descriptors
* to net_poll which, indiectly, calls to function.
*
* Input Parameters:
* psock - An instance of the internal socket structure.
* fds - The structure describing the events to be monitored, OR NULL if
* this is a request to stop monitoring events.
* setup - true: Setup up the poll; false: Teardown the poll
*
* Returned Value:
* 0: Success; Negated errno on failure
*
****************************************************************************/
static int pkt_poll_local(FAR struct socket *psock, FAR struct pollfd *fds,
bool setup)
{
return -ENOSYS;
}
/****************************************************************************
* Name: pkt_close
*
* Description:
* Performs the close operation on a raw packet socket instance
*
* Input Parameters:
* psock Socket instance
*
* Returned Value:
* 0 on success; a negated errno value is returned on any failure.
*
* Assumptions:
*
****************************************************************************/
static int pkt_close(FAR struct socket *psock)
{
/* Perform some pre-close operations for the raw packet address type */
switch (psock->s_type)
{
case SOCK_RAW:
{
FAR struct pkt_conn_s *conn = psock->s_conn;
/* Is this the last reference to the connection structure (there
* could be more if the socket was dup'ed).
*/
if (conn->crefs <= 1)
{
/* Yes... free the connection structure */
conn->crefs = 0; /* No more references on the connection */
pkt_free(psock->s_conn); /* Free network resources */
}
else
{
/* No.. Just decrement the reference count */
conn->crefs--;
}
return OK;
}
default:
return -EBADF;
}
}
/****************************************************************************
* Public Functions
****************************************************************************/
#endif /* CONFIG_NET_PKT */