273 lines
8.3 KiB
C
273 lines
8.3 KiB
C
/****************************************************************************
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* apps/netutils/netlib/netlib_ipv6adaptor.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/socket.h>
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#include <sys/ioctl.h>
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#include <stdint.h>
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#include <stdlib.h>
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#include <stdio.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 <net/if.h>
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#include <nuttx/net/ip.h>
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#include "netutils/netlib.h"
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#ifdef CONFIG_NET_IPv6
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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/****************************************************************************
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* Name: _netlib_ipv6adaptor
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*
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* Description:
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* Given the destination address, destipaddr, return the IP address
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* assigned to the network adaptor that connects the sub-net that
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* includes destipaddr.
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*
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* NOTE: This does not account for any routing information that may
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* appear in the routing table. A complete solution could involve three
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* steps:
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*
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* 1. Call netlib_ipv6adaptor() to find the address of the network
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* adaptor for the destination address.
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* 2. If this fails, then look up the router address in the routing table
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* that can forward to the destination address, then
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* 3. Call netlib_ipv6adaptor() to find the address of the network
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* adaptor for that router address.
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*
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* Input Parameters:
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* destipaddr - The destination IPv6 address
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* srcipaddr - The location to return that adaptor address that serves
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* the sub-net that includes the destination address.
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*
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* Returned Value:
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* Zero (OK) is returned on success with srcipaddr valid. A negated
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* errno value is returned on any failure and in this case the srcipaddr
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* is not valid.
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*
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****************************************************************************/
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static int _netlib_ipv6adaptor(FAR const struct in6_addr *destipaddr,
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FAR struct in6_addr *srcipaddr)
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{
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FAR struct lifreq *lifr;
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struct lifconf lifc;
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size_t allocsize;
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size_t buflen;
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int nintf;
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int ret;
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int sd;
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int i;
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/* REVISIT: Should check the routing table to see if there is a route
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* for the destipaddr before finding the device that provides the sub-net.
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*/
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/* Find the size of the buffer we need to hold the interface descriptions */
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lifc.lifc_req = NULL;
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lifc.lifc_len = 0;
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sd = socket(NET_SOCK_FAMILY, NET_SOCK_TYPE, NET_SOCK_PROTOCOL);
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if (sd < 0)
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{
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ret = -errno;
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fprintf(stderr, "ERROR: socket() failed: %d\n", ret);
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return ret;
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}
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ret = ioctl(sd, SIOCGLIFCONF, (unsigned long)((uintptr_t)&lifc));
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if (ret < 0)
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{
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ret = -errno;
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fprintf(stderr, "ERROR: ioctl(SIOCGLIFCONF) failed: %d\n", ret);
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goto errout_with_sd;
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}
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/* Allocate the buffer to hold the interface descriptions */
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allocsize = lifc.lifc_len;
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lifr = (FAR struct lifreq *)malloc(allocsize);
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if (lifr == NULL)
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{
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fprintf(stderr, "ERROR: Failed to allocate LIFC buffer\n");
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ret = -ENOMEM;
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goto errout_with_sd;
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}
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/* Get the interface descriptions */
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lifc.lifc_req = lifr;
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ret = ioctl(sd, SIOCGLIFCONF, (unsigned long)((uintptr_t)&lifc));
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if (ret < 0)
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{
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ret = -errno;
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fprintf(stderr, "ERROR: ioctl(SIOCGLIFCONF) failed: %d\n", ret);
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goto errout_with_ifr;
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}
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/* Find an interface that supports the subnet needed by the provided
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* IPv6 address. Be careful! The size of the returned buffer could
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* be different if the network device configuration changed in between
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* the two calls!
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*/
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buflen = lifc.lifc_len;
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if (buflen > allocsize)
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{
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/* Something has changed. Limit to the original size (OR do the
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* allocation and IOCTL again).
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*/
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buflen = allocsize;
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}
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nintf = buflen / sizeof(struct lifreq);
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ret = -EHOSTUNREACH;
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for (i = 0; i < nintf; i++)
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{
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FAR struct lifreq *req = &lifr[i];
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FAR struct sockaddr_in6 *addr =
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(FAR struct sockaddr_in6 *)&req->lifr_addr;
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struct lifreq maskreq;
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FAR struct sockaddr_in6 *netmask;
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int status;
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/* Get the network mask */
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strlcpy(maskreq.lifr_name, lifr->lifr_name, IFNAMSIZ);
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status = ioctl(sd, SIOCGLIFNETMASK,
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(unsigned long)((uintptr_t)&maskreq));
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if (status < 0)
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{
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ret = -errno;
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fprintf(stderr, "ERROR: ioctl(SIOCGLIFNETMASK) failed: %d\n",
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ret);
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goto errout_with_ifr;
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}
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netmask = (FAR struct sockaddr_in6 *)&maskreq.lifr_addr;
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/* Does this device provide the sub-net? */
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if (net_ipv6addr_maskcmp(addr->sin6_addr.s6_addr16,
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destipaddr->s6_addr16,
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netmask->sin6_addr.s6_addr16))
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{
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/* Yes.. return the IP address assigned to this adaptor */
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net_ipv6addr_copy(srcipaddr->s6_addr16,
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addr->sin6_addr.s6_addr16);
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ret = OK;
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break;
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}
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}
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errout_with_ifr:
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free(lifr);
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errout_with_sd:
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close(sd);
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return ret;
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}
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: netlib_ipv6adaptor
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*
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* Description:
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* Given the destination address, destipaddr, return the IP address
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* assigned to the network adaptor that connects the sub-net that
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* includes destipaddr.
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*
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* If routing table support is enabled, then this logic will account for
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* the case where the destination address is not locally accessible. In
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* this case, it will return the IP address of the network adaptor that
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* provides the correct router to handle that destination address.
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*
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* Input Parameters:
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* destipaddr - The destination IPv6 address
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* srcipaddr - The location to return that adaptor address that serves
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* the sub-net that includes the destination address.
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*
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* Returned Value:
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* Zero (OK) is returned on success with srcipaddr valid. A negated
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* errno value is returned on any failure and in this case the srcipaddr
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* is not valid.
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*
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****************************************************************************/
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int netlib_ipv6adaptor(FAR const struct in6_addr *destipaddr,
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FAR struct in6_addr *srcipaddr)
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{
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int ret;
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DEBUGASSERT(destipaddr != NULL && srcipaddr != NULL);
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ret = _netlib_ipv6adaptor(destipaddr, srcipaddr);
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#ifdef HAVE_ROUTE_PROCFS
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if (ret < 0)
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{
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struct in6_addr router;
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/* If the first adaptor look-up on the the destination IP address
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* failed, then the IP address cannot be sent on any of the
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* currently up network devices configured with an IPv6 address.
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*
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* But perhaps the destination address is on a sub-net that is
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* accessible on a router that can be reached through a local
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* network adaptor?
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*/
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ret = netlib_ipv6router(destipaddr, &router);
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if (ret >= 0)
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{
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/* Yes... try again using the router address as the destination
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* address.
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*/
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ret = _netlib_ipv6adaptor(&router, srcipaddr);
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}
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}
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#endif
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return ret;
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}
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#endif /* CONFIG_NET_IPv6 */
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