a2097cfb71
The priorities for finding a network adapter are as follows: 1. if laddr is not ANY, use laddr to find device; 2. if laddr is ANY, and bound index is not 0, use bound index to find device; 3. if laddr is ANY and no device is bound, use raddr to find device. Signed-off-by: zhanghongyu <zhanghongyu@xiaomi.com>
231 lines
7.0 KiB
C
231 lines
7.0 KiB
C
/****************************************************************************
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* net/udp/udp_finddev.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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#if defined(CONFIG_NET) && defined(CONFIG_NET_UDP)
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#include <string.h>
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#include <nuttx/net/netdev.h>
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#include <nuttx/net/ip.h>
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#include "netdev/netdev.h"
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#include "inet/inet.h"
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#include "udp/udp.h"
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#include "utils/utils.h"
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: udp_find_laddr_device
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*
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* Description:
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* Select the network driver to use with the UDP transaction using the
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* locally bound IP address.
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*
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* This is currently used in the UDP network poll setup to determine
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* which device is being polled.
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*
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* Input Parameters:
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* conn - UDP connection structure (not currently used).
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*
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* Returned Value:
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* A pointer to the network driver to use. NULL is returned if driver is
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* not bound to any local device.
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*
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****************************************************************************/
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FAR struct net_driver_s *udp_find_laddr_device(FAR struct udp_conn_s *conn)
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{
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/* There are multiple network devices. We need to select the device that
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* is going to route the UDP packet based on the provided IP address.
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*/
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#ifdef CONFIG_NET_IPv4
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#ifdef CONFIG_NET_IPv6
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if (conn->domain == PF_INET)
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#endif
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{
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/* Make sure that the socket is bound to some non-zero, local
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* address. Zero is used as an indication that the laddr is
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* uninitialized and that the socket is, hence, not bound.
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*/
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if (conn->u.ipv4.laddr == 0)
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{
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return NULL;
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}
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else
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{
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return netdev_findby_ripv4addr(conn->u.ipv4.laddr,
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conn->u.ipv4.laddr);
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}
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}
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#endif
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#ifdef CONFIG_NET_IPv6
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#ifdef CONFIG_NET_IPv4
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else
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#endif
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{
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/* Make sure that the socket is bound to some non-zero, local
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* address. The IPv6 unspecified address is used as an indication
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* that the laddr is uninitialized and that the socket is, hence,
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* not bound.
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*/
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if (net_ipv6addr_cmp(conn->u.ipv6.laddr, g_ipv6_unspecaddr))
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{
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return NULL;
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}
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else
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{
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return netdev_findby_ripv6addr(conn->u.ipv6.laddr,
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conn->u.ipv6.laddr);
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}
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}
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#endif
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}
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/****************************************************************************
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* Name: udp_find_raddr_device
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*
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* Description:
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* Select the network driver to use with the UDP transaction using the
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* remote IP address.
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*
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* This function is called for UDP sendto() in order to determine which
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* network device that the UDP pack should be sent on.
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*
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* Input Parameters:
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* conn - UDP connection structure.
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*
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* Returned Value:
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* A pointer to the network driver to use.
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*
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****************************************************************************/
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FAR struct net_driver_s *
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udp_find_raddr_device(FAR struct udp_conn_s *conn,
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FAR struct sockaddr_storage *remote)
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{
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/* We need to select the device that is going to route the UDP packet
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* based on the provided IP address.
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*/
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#ifdef CONFIG_NET_IPv4
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#ifdef CONFIG_NET_IPv6
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if (conn->domain == PF_INET)
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#endif
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{
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in_addr_t raddr;
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if (conn->u.ipv4.laddr != INADDR_ANY)
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{
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/* If the socket is bound to some non-zero, local address.
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* Normal lookup using the verified local address.
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*/
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return netdev_findby_lipv4addr(conn->u.ipv4.laddr);
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}
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#ifdef CONFIG_NET_BINDTODEVICE
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if (conn->sconn.s_boundto != 0)
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{
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/* If the socket is bound to a local network device.
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* Select the network device that has been bound.
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* If the index is invalid, return NULL.
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*/
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return netdev_findbyindex(conn->sconn.s_boundto);
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}
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#endif
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if (remote)
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{
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FAR const struct sockaddr_in *inaddr =
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(FAR const struct sockaddr_in *)remote;
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net_ipv4addr_copy(raddr, inaddr->sin_addr.s_addr);
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}
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else
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{
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net_ipv4addr_copy(raddr, conn->u.ipv4.raddr);
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}
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/* Normal lookup using the verified remote address */
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return netdev_findby_ripv4addr(conn->u.ipv4.laddr, raddr);
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}
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#endif
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#ifdef CONFIG_NET_IPv6
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#ifdef CONFIG_NET_IPv4
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else
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#endif
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{
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net_ipv6addr_t raddr;
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if (!net_ipv6addr_cmp(conn->u.ipv6.laddr, g_ipv6_unspecaddr))
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{
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/* If the socket is bound to some non-zero, local address.
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* Normal lookup using the verified local address.
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*/
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return netdev_findby_lipv6addr(conn->u.ipv6.laddr);
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}
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#ifdef CONFIG_NET_BINDTODEVICE
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if (conn->sconn.s_boundto != 0)
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{
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/* If the socket is bound to a local network device.
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* Select the network device that has been bound.
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* If the index is invalid, return NULL.
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*/
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return netdev_findbyindex(conn->sconn.s_boundto);
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}
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#endif
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if (remote)
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{
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FAR const struct sockaddr_in6 *inaddr =
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(FAR const struct sockaddr_in6 *)remote;
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net_ipv6addr_copy(raddr, inaddr->sin6_addr.s6_addr16);
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}
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else
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{
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net_ipv6addr_copy(raddr, conn->u.ipv6.raddr);
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}
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/* Normal lookup using the verified remote address */
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return netdev_findby_ripv6addr(conn->u.ipv6.laddr, raddr);
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}
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#endif
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}
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#endif /* CONFIG_NET && CONFIG_NET_UDP */
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