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netutils/netlib/netlib_getroute.c: Add function to retrieve routing tables using netlink.

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This commit is contained in:
Gregory Nutt 2019-11-10 12:36:34 -06:00
parent e260ea779c
commit 438777cd38
7 changed files with 411 additions and 77 deletions
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12
include/netutils/netlib.h
View File

@ -159,11 +159,11 @@
****************************************************************************/ ****************************************************************************/
#ifdef HAVE_ROUTE_PROCFS #ifdef HAVE_ROUTE_PROCFS
#ifdef CONFIG_NET_IPv4
/* Describes one entry from the IPv4 routing table. All addresses are in /* Describes one entry from the IPv4 routing table. All addresses are in
* host byte order! * host byte order!
*/ */
#ifdef CONFIG_NET_IPv4
struct netlib_ipv4_route_s struct netlib_ipv4_route_s
{ {
in_addr_t prefix; /* Routing prefix */ in_addr_t prefix; /* Routing prefix */
@ -172,11 +172,11 @@ struct netlib_ipv4_route_s
}; };
#endif #endif
#ifdef CONFIG_NET_IPv6
/* Describes one entry from the IPv6 routing table. All addresses are in /* Describes one entry from the IPv6 routing table. All addresses are in
* host byte order! * host byte order!
*/ */
#ifdef CONFIG_NET_IPv6
struct netlib_ipv6_route_s struct netlib_ipv6_route_s
{ {
uint16_t prefix[8]; /* Routing prefix */ uint16_t prefix[8]; /* Routing prefix */
@ -196,7 +196,7 @@ struct netlib_device_s
#endif #endif
char ifname[IFNAMSIZ]; /* Interface name */ char ifname[IFNAMSIZ]; /* Interface name */
}; };
#endif #endif /* CONFIG_NETLINK_ROUTE*/
#ifdef CONFIG_NETUTILS_NETLIB_GENERICURLPARSER #ifdef CONFIG_NETUTILS_NETLIB_GENERICURLPARSER
struct url_s struct url_s
@ -363,6 +363,12 @@ int netlib_ipv6router(FAR const struct in6_addr *destipaddr,
# endif # endif
#endif #endif
#if defined(CONFIG_NETLINK_ROUTE) && defined(CONFIG_NET_ROUTE)
struct rtentry; /* Forward reference */
ssize_t netlib_get_route(FAR struct rtentry *rtelist,
unsigned int nentries, sa_family_t family);
#endif
#ifdef CONFIG_NET_ICMPv6_AUTOCONF #ifdef CONFIG_NET_ICMPv6_AUTOCONF
/* ICMPv6 Autoconfiguration */ /* ICMPv6 Autoconfiguration */

3
netutils/netlib/Makefile
View File

@ -88,6 +88,9 @@ endif
ifeq ($(CONFIG_NETLINK_ROUTE),y) ifeq ($(CONFIG_NETLINK_ROUTE),y)
CSRCS += netlib_getdevs.c CSRCS += netlib_getdevs.c
ifeq ($(CONFIG_NET_ROUTE),y)
CSRCS += netlib_getroute.c
endif
endif endif
# These require TCP support # These require TCP support

2
netutils/netlib/netlib_getarptab.c
View File

@ -210,7 +210,7 @@ ssize_t netlib_get_arptable(FAR struct arp_entry_s *arptab,
/* Copy the ARP table data to the caller's buffer */ /* Copy the ARP table data to the caller's buffer */
paysize = resp->attr.rta_len; paysize = RTA_PAYLOAD(&resp->attr);
if (paysize > maxsize) if (paysize > maxsize)
{ {
paysize = maxsize; paysize = maxsize;

140
netutils/netlib/netlib_getdevs.c
View File

@ -40,11 +40,11 @@
#include <nuttx/config.h> #include <nuttx/config.h>
#include <sys/socket.h> #include <sys/socket.h>
#include <stdio.h>
#include <stdlib.h> #include <stdlib.h>
#include <unistd.h> #include <unistd.h>
#include <string.h> #include <string.h>
#include <errno.h> #include <errno.h>
#include <errno.h>
#include <netpacket/netlink.h> #include <netpacket/netlink.h>
@ -168,91 +168,93 @@ ssize_t netlib_get_devices(FAR struct netlib_device_s *devlist,
{ {
/* Receive the next device response */ /* Receive the next device response */
nrecvd = recv(fd, &resp, sizeof(struct netlib_recvfrom_response_s), 0); nrecvd = recv(fd, &resp, sizeof(struct netlib_recvfrom_response_s), 0);
if (nrecvd < 0) if (nrecvd < 0)
{ {
int errcode = errno; int errcode = errno;
fprintf(stderr, "ERROR: recv() failed: %d\n", errcode); fprintf(stderr, "ERROR: recv() failed: %d\n", errcode);
ret = -errcode; ret = -errcode;
goto errout_with_socket; goto errout_with_socket;
} }
/* Verify the data and transfer the device list to the caller */ /* Verify the data and transfer the device list to the caller */
if (nrecvd != sizeof(struct netlib_recvfrom_response_s) || if (nrecvd != sizeof(struct netlib_recvfrom_response_s) ||
resp.hdr.nlmsg_len < sizeof(struct nlmsghdr) || resp.hdr.nlmsg_len < sizeof(struct nlmsghdr) ||
resp.hdr.nlmsg_len != nrecvd) resp.hdr.nlmsg_len != nrecvd)
{ {
fprintf(stderr, "ERROR: Bad message\n"); fprintf(stderr, "ERROR: Bad message\n");
ret = -EIO; ret = -EIO;
goto errout_with_socket; goto errout_with_socket;
} }
/* The sequence number in the response should match the sequence /* The sequence number in the response should match the sequence
* number in the request (since we created the socket, this should * number in the request (since we created the socket, this should
* always be true). * always be true).
*/ */
if (resp.hdr.nlmsg_seq != thiseq) if (resp.hdr.nlmsg_seq != thiseq)
{ {
fprintf(stderr, "ERROR: Bad sequence number in response\n"); fprintf(stderr, "ERROR: Bad sequence number in response\n");
ret = -EIO; ret = -EIO;
goto errout_with_socket; goto errout_with_socket;
} }
/* Copy the device list to the caller's buffer */ /* Copy the device list to the caller's buffer */
switch (resp.hdr.nlmsg_type) switch (resp.hdr.nlmsg_type)
{ {
case NLMSG_DONE: case NLMSG_DONE:
enddump = true; enddump = true;
break; break;
case RTM_NEWLINK: case RTM_NEWLINK:
{ {
FAR struct ifinfomsg *iface; FAR struct rtattr *attr;
FAR struct rtattr *attr; int len;
int len;
/* Decode the response */ /* Decode the response */
iface = NLMSG_DATA(&resp.hdr); attr = &resp.attr;
len = resp.hdr.nlmsg_len - NLMSG_LENGTH(sizeof(struct ifinfomsg)); len = RTA_PAYLOAD(attr);
for (attr = IFLA_RTA(iface); for (; RTA_OK(attr, len); attr = RTA_NEXT(attr, len))
RTA_OK(attr, len); {
attr = RTA_NEXT(attr, len)) switch (attr->rta_type)
{ {
switch (attr->rta_type) case IFLA_IFNAME:
{ if (ncopied < nentries)
case IFLA_IFNAME: {
if (ncopied < nentries)
{
#ifdef CONFIG_NETDEV_IFINDEX #ifdef CONFIG_NETDEV_IFINDEX
devlist[ncopied].ifindex = iface->ifi_index; FAR struct ifinfomsg *iface = &resp.iface;
devlist[ncopied].ifindex = iface->ifi_index;
#endif #endif
strncpy(devlist[ncopied].ifname, strncpy(devlist[ncopied].ifname,
(FAR char *)RTA_DATA(attr), IFNAMSIZ); (FAR char *)RTA_DATA(attr), IFNAMSIZ);
ncopied++; ncopied++;
} }
break; break;
default: default:
break; break;
} }
} }
} }
break; break;
default: default:
fprintf(stderr, "ERROR: Message type %u, length %lu\n", fprintf(stderr, "ERROR: Message type %u, length %lu\n",
resp.hdr.nlmsg_type, (unsigned long)resp.hdr.nlmsg_len); resp.hdr.nlmsg_type, (unsigned long)resp.hdr.nlmsg_len);
ret = -EIO; ret = -EIO;
goto errout_with_socket; goto errout_with_socket;
} }
} }
close(fd);
return ncopied;
errout_with_socket: errout_with_socket:
close(fd); close(fd);
return ret; return ret;

2
netutils/netlib/netlib_getnbtab.c
View File

@ -211,7 +211,7 @@ ssize_t netlib_get_nbtable(FAR struct neighbor_entry_s *nbtab,
/* Copy the Neighbor table data to the caller's buffer */ /* Copy the Neighbor table data to the caller's buffer */
paysize = resp->attr.rta_len; paysize = RTA_PAYLOAD(&resp->attr);
if (paysize > maxsize) if (paysize > maxsize)
{ {
paysize = maxsize; paysize = maxsize;

323
netutils/netlib/netlib_getroute.c Normal file
View File

@ -0,0 +1,323 @@
/****************************************************************************
* netutils/netlib/netlib_getroute.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 <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <errno.h>
#include <net/route.h>
#include <netpacket/netlink.h>
#include "netutils/netlib.h"
#if defined(CONFIG_NETLINK_ROUTE) && defined(CONFIG_NET_ROUTE)
/****************************************************************************
* Private Types
****************************************************************************/
struct netlib_sendto_request_s
{
struct nlmsghdr hdr;
struct rtgenmsg gen;
};
struct netlib_recvfrom_response_s
{
struct nlmsghdr hdr;
struct rtmsg rte;
struct rtattr attr;
/* Attribute data and additional attributes follow */
};
/****************************************************************************
* Private Functions
****************************************************************************/
static int copy_address(FAR struct sockaddr_storage *dest, FAR void *src,
unsigned int addrlen, unsigned int maxaddr,
sa_family_t family)
{
DEBUGASSERT(addrlen == maxaddr);
if (addrlen > maxaddr)
{
fprintf(stderr, "ERROR: Bad address length: %u\n", addrlen);
return -EIO;
}
dest->ss_family = family;
memcpy(dest->ss_data, src, addrlen);
return OK;
}
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: netlib_get_route
*
* Description:
* Return a snapshot of the routing table for the selected address family.
*
* Parameters:
* rtelist - The location to store the list of devices.
* nentries - The size of the provided 'rtelist' in number of entries.
* The size of one entry is given by sizeof(struct rtentry);
* family - Address family. See AF_* definitions in sys/socket.h.
*
* Return:
* The number of routing table entries read is returned on success; a
* negated errno value is returned on failure.
*
****************************************************************************/
ssize_t netlib_get_route(FAR struct rtentry *rtelist,
unsigned int nentries, sa_family_t family)
{
struct netlib_sendto_request_s req;
struct netlib_recvfrom_response_s resp;
struct sockaddr_nl addr;
static unsigned int seqno = 0;
unsigned int thiseq;
unsigned int maxaddr;
ssize_t nsent;
ssize_t nrecvd;
size_t ncopied = 0;
pid_t pid;
bool enddump;
int fd;
int ret;
/* 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);
return -errcode;
}
/* Bind the socket so that we can use send() and receive() */
pid = getpid();
addr.nl_family = AF_NETLINK;
addr.nl_pad = 0;
addr.nl_pid = pid;
addr.nl_groups = RTM_GETROUTE;
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 rtgenmsg));
req.hdr.nlmsg_flags = NLM_F_REQUEST | NLM_F_DUMP;
req.hdr.nlmsg_seq = thiseq;
req.hdr.nlmsg_type = RTM_GETROUTE;
req.hdr.nlmsg_pid = pid;
req.gen.rtgen_family = family;
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(s) */
maxaddr = sizeof(struct sockaddr_storage) - sizeof(sa_family_t);
for (enddump = false; !enddump; )
{
/* Receive the next device response */
nrecvd = recv(fd, &resp, sizeof(struct netlib_recvfrom_response_s), 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 device list to the caller */
if (nrecvd != sizeof(struct netlib_recvfrom_response_s) ||
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;
}
/* This should be a routing table response */
if (resp.rte.rtm_table != RT_TABLE_MAIN)
{
fprintf(stderr, "ERROR: Not a routing table response\n");
ret = -EIO;
goto errout_with_socket;
}
/* Copy the routing table entry to the caller's buffer */
switch (resp.hdr.nlmsg_type)
{
case NLMSG_DONE:
enddump = true;
break;
case RTM_NEWLINK:
break; /* Ignore any link information */
case RTM_NEWROUTE:
{
FAR struct rtentry *dest;
FAR struct rtattr *attr;
int len;
DEBUGASSERT(resp.rte.rtm_family == family);
/* Decode the response */
dest = &rtelist[ncopied];
memset(dest, 0, sizeof(struct rtentry));
attr = &resp.attr;
len = RTA_PAYLOAD(attr);
for (; RTA_OK(attr, len); attr = RTA_NEXT(attr, len))
{
unsigned int attrlen = RTA_PAYLOAD(attr);
switch (attr->rta_type)
{
case RTA_DST: /* The destination network */
ret = copy_address(&dest->rt_dst, RTA_DATA(attr),
attrlen, maxaddr, family);
if (ret < 0)
{
goto errout_with_socket;
}
break;
case RTA_SRC: /* The source address mask */
break;
case RTA_GENMASK: /* The network address mask */
ret = copy_address(&dest->rt_genmask, RTA_DATA(attr),
attrlen, maxaddr, family);
if (ret < 0)
{
goto errout_with_socket;
}
break;
case RTA_GATEWAY: /* Route packets via this router */
ret = copy_address(&dest->rt_gateway, RTA_DATA(attr),
attrlen, maxaddr, family);
if (ret < 0)
{
goto errout_with_socket;
}
break;
default:
break;
}
}
ncopied++;
}
break;
default:
fprintf(stderr, "ERROR: Message type %u, length %lu\n",
resp.hdr.nlmsg_type, (unsigned long)resp.hdr.nlmsg_len);
ret = -EIO;
goto errout_with_socket;
}
}
close(fd);
return ncopied;
errout_with_socket:
close(fd);
return ret;
}
#endif /* CONFIG_NETLINK_ROUTE && CONFIG_NET_ROUTE */

6
wireless/wapi/src/network.c
View File

@ -119,19 +119,19 @@ static int wapi_act_route_gw(int sock, int act,
/* Set target. */ /* Set target. */
sin = (struct sockaddr_in *)&rt.rt_dst; sin = (FAR struct sockaddr_in *)&rt.rt_dst;
sin->sin_family = AF_INET; sin->sin_family = AF_INET;
memcpy(&sin->sin_addr, target, sizeof(struct in_addr)); memcpy(&sin->sin_addr, target, sizeof(struct in_addr));
/* Set netmask. */ /* Set netmask. */
sin = (struct sockaddr_in *)&rt.rt_genmask; sin = (FAR struct sockaddr_in *)&rt.rt_genmask;
sin->sin_family = AF_INET; sin->sin_family = AF_INET;
memcpy(&sin->sin_addr, netmask, sizeof(struct in_addr)); memcpy(&sin->sin_addr, netmask, sizeof(struct in_addr));
/* Set gateway. */ /* Set gateway. */
sin = (struct sockaddr_in *)&rt.rt_gateway; sin = (FAR struct sockaddr_in *)&rt.rt_gateway;
sin->sin_family = AF_INET; sin->sin_family = AF_INET;
memcpy(&sin->sin_addr, gw, sizeof(struct in_addr)); memcpy(&sin->sin_addr, gw, sizeof(struct in_addr));