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netutils/netlib/netlib_getnbtab.c: Add support for retrieving a snapshot of the IPv6 neighbor table using Netlink sockets.

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This commit is contained in:
Gregory Nutt 2019-11-08 11:30:32 -06:00
parent caecdd6079
commit 2507cc15e8
4 changed files with 245 additions and 10 deletions
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6
include/netutils/netlib.h
View File

@ -297,6 +297,12 @@ int netlib_ipv6adaptor(FAR const struct in6_addr *destipaddr,
uint8_t netlib_ipv6netmask2prefix(FAR const uint16_t *mask);
void netlib_prefix2ipv6netmask(uint8_t preflen, FAR struct in6_addr *netmask);
#ifdef CONFIG_NETLINK_ROUTE
struct neighbor_entry_s;
ssize_t netlib_get_nbtable(FAR struct neighbor_entry_s *nbtab,
unsigned int nentries);
#endif
#endif
#ifdef CONFIG_NETDEV_WIRELESS_IOCTL

18
netutils/netlib/Makefile
View File

@ -1,7 +1,8 @@
############################################################################
# apps/netutils/netlib/Makefile
#
# Copyright (C) 2011-2012, 2014-2015, 2017 Gregory Nutt. All rights reserved.
# Copyright (C) 2011-2012, 2014-2015, 2017, 2019 Gregory Nutt. All
# rights reserved.
# Author: Gregory Nutt <gnutt@nuttx.org>
#
# Redistribution and use in source and binary forms, with or without
@ -41,6 +42,7 @@ CSRCS = netlib_ipv4addrconv.c netlib_ethaddrconv.c netlib_parsehttpurl.c
CSRCS += netlib_setifstatus.c netlib_getifstatus.c
# Generic URL parsing support
ifeq ($(CONFIG_NETUTILS_NETLIB_GENERICURLPARSER),y)
CSRCS += netlib_parseurl.c
endif
@ -54,6 +56,9 @@ CSRCS += netlib_getdripv4addr.c netlib_getipv4netmask.c
CSRCS += netlib_ipv4adaptor.c
ifeq ($(CONFIG_NET_ARP),y)
CSRCS += netlib_getarp.c netlib_setarp.c netlib_delarp.c
ifeq ($(CONFIG_NETLINK_ROUTE),y)
CSRCS += netlib_getarptab.c
endif
endif
ifeq ($(CONFIG_NETDB_DNSCLIENT),y)
CSRCS += netlib_setipv4dnsaddr.c
@ -74,6 +79,9 @@ endif
ifeq ($(CONFIG_NET_ROUTE),y)
CSRCS += netlib_ipv6route.c netlib_ipv6router.c
endif
ifeq ($(CONFIG_NETLINK_ROUTE),y)
CSRCS += netlib_getnbtab.c
endif
endif
# These require TCP support
@ -84,14 +92,6 @@ CSRCS += netlib_server.c netlib_listenon.c
endif
endif
# These require Netlink support
ifeq ($(CONFIG_NETLINK_ROUTE),y)
ifeq ($(CONFIG_NET_ARP),y)
CSRCS += netlib_getarptab.c
endif
endif
# These require wireless IOCTL support */
ifeq ($(CONFIG_NETDEV_WIRELESS_IOCTL),y)

3
netutils/netlib/netlib_getarptab.c
View File

@ -96,7 +96,8 @@ struct netlib_recvfrom_response_s
*
****************************************************************************/
ssize_t netlib_get_arptable(FAR struct arp_entry_s *arptab, unsigned int nentries)
ssize_t netlib_get_arptable(FAR struct arp_entry_s *arptab,
unsigned int nentries)
{
FAR struct netlib_recvfrom_response_s *resp;
struct netlib_sendto_request_s req;

228
netutils/netlib/netlib_getnbtab.c Normal file
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@ -0,0 +1,228 @@
/****************************************************************************
* netutils/netlib/netlib_getntab.c
*
* Copyright (C) 2019 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <gnutt@nuttx.org>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* 3. Neither the name NuttX nor the names of its contributors may be
* used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <sys/socket.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <errno.h>
#include <errno.h>
#include <netpacket/netlink.h>
#include <nuttx/net/neighbor.h>
#include "netutils/netlib.h"
#if defined(CONFIG_NET_IPv6) && defined(CONFIG_NETLINK_ROUTE)
/****************************************************************************
* Private Types
****************************************************************************/
struct netlib_sendto_request_s
{
struct nlmsghdr hdr;
struct ndmsg msg;
};
struct netlib_recvfrom_response_s
{
struct nlmsghdr hdr;
struct ndmsg msg;
struct rtattr attr;
uint8_t data[1];
};
#define SIZEOF_NETLIB_RECVFROM_RESPONSE_S(n) \
(sizeof(struct netlib_recvfrom_response_s) + (n) - 1)
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: netlib_get_nbtable
*
* Description:
* Attempt to read the entire Neighbor table into a buffer.
*
* Parameters:
* nbtab - The location to store the copy of the Neighbor table
* nentries - The size of the provided 'nbtab' in number of entries each
* of size sizeof(struct neighbor_entry_s)
*
* Return:
* The number of Neighbor table entries read is returned on success; a
* negated errno value is returned on failure.
*
****************************************************************************/
ssize_t netlib_get_nbtable(FAR struct neighbor_entry_s *nbtab,
unsigned int nentries)
{
FAR struct netlib_recvfrom_response_s *resp;
struct netlib_sendto_request_s req;
struct sockaddr_nl addr;
static unsigned int seqno = 0;
unsigned int thiseq;
unsigned int allocsize;
ssize_t nsent;
ssize_t nrecvd;
ssize_t paysize;
ssize_t maxsize;
int fd;
int ret;
/* Pre-allocate a buffer to hold the response */
maxsize = CONFIG_NET_IPv6_NCONF_ENTRIES *
sizeof(struct neighbor_entry_s);
allocsize = SIZEOF_NETLIB_RECVFROM_RESPONSE_S(maxsize);
resp = (FAR struct netlib_recvfrom_response_s *)malloc(allocsize);
if (resp == NULL)
{
fprintf(stderr, "ERROR: Failed to allocate response buffer\n");
ret = -ENOMEM;
return EXIT_FAILURE;
}
/* Create a NetLink socket with NETLINK_ROUTE protocol */
fd = socket(PF_NETLINK, SOCK_DGRAM, NETLINK_ROUTE);
if (fd < 0)
{
int errcode = errno;
fprintf(stderr, "ERROR: socket() failed: %d\n", errcode);
ret = -errcode;
goto errout_with_resp;
}
/* Bind the socket so that we can use send() and receive() */
addr.nl_family = AF_NETLINK;
addr.nl_pad = 0;
addr.nl_pid = getpid();
addr.nl_groups = RTM_GETNEIGH;
ret = bind(fd, (FAR const struct sockaddr *)&addr,
sizeof( struct sockaddr_nl));
if (fd < 0)
{
int errcode = errno;
fprintf(stderr, "ERROR: bind() failed: %d\n", errcode);
ret = -errcode;
goto errout_with_socket;
}
/* Initialize the request */
thiseq = ++seqno;
memset(&req, 0, sizeof(req));
req.hdr.nlmsg_len = NLMSG_LENGTH(sizeof(struct ndmsg));
req.hdr.nlmsg_flags = NLM_F_REQUEST | NLM_F_ROOT | NLM_F_REQUEST;
req.hdr.nlmsg_seq = thiseq;
req.hdr.nlmsg_type = RTM_GETNEIGH;
req.msg.ndm_family = AF_INET6;
nsent = send(fd, &req, req.hdr.nlmsg_len, 0);
if (nsent < 0)
{
int errcode = errno;
fprintf(stderr, "ERROR: send() failed: %d\n", errcode);
ret = -errcode;
goto errout_with_socket;
}
/* Read the response */
nrecvd = recv(fd, resp, allocsize, 0);
if (nrecvd < 0)
{
int errcode = errno;
fprintf(stderr, "ERROR: recv() failed: %d\n", errcode);
ret = -errcode;
goto errout_with_socket;
}
/* Verify the data and transfer the Neighbor table data to the caller */
if (resp->hdr.nlmsg_len < sizeof(struct nlmsghdr) ||
resp->hdr.nlmsg_len > nrecvd)
{
fprintf(stderr, "ERROR: Bad message\n");
ret = -EIO;
goto errout_with_socket;
}
/* The sequence number in the response should match the sequence
* number in the request (since we created the socket, this should
* always be true).
*/
if (resp->hdr.nlmsg_seq != thiseq)
{
fprintf(stderr, "ERROR: Bad sequence number in response\n");
ret = -EIO;
goto errout_with_socket;
}
/* Copy the Neighbor table data to the caller's buffer */
paysize = resp->attr.rta_len;
if (paysize > maxsize)
{
paysize = maxsize;
}
memcpy(nbtab, resp->data, paysize);
ret = paysize / sizeof(struct neighbor_entry_s);
errout_with_socket:
close(fd);
errout_with_resp:
free(resp);
return ret;
}
#endif /* CONFIG_NET_IPv6 && CONFIG_NETLINK_ROUTE */