sergiotarxz/nuttx
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity
bda0a9c6a7
nuttx/net/netlink/netlink_route.c

738 lines
21 KiB
C
Raw Blame History

/****************************************************************************
* net/netlink/netlink_route.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/types.h>
#include <string.h>
#include <assert.h>
#include <errno.h>
#include <netpacket/netlink.h>
#include <nuttx/kmalloc.h>
#include <nuttx/net/net.h>
#include <nuttx/net/arp.h>
#include <nuttx/net/neighbor.h>
#include "netdev/netdev.h"
#include "arp/arp.h"
#include "neighbor/neighbor.h"
#include "netlink/netlink.h"
#ifdef CONFIG_NETLINK_ROUTE
/****************************************************************************
* Private Types
****************************************************************************/
#define IFA_RTA(r) \
((FAR struct rtattr *)(((FAR char *)(r)) + \
NLMSG_ALIGN(sizeof(struct ifaddrmsg))))
#define IFA_PAYLOAD(n) \
NLMSG_PAYLOAD(n, sizeof(struct ifaddrmsg))
/****************************************************************************
* Private Types
****************************************************************************/
/* RTM_GETLINK: Enumerate network devices . The message contains the
* 'rtgenmsg' structure.
*/
struct getlink_sendto_request_s
{
struct nlmsghdr hdr;
struct rtgenmsg gen;
};
struct getlink_recvfrom_response_s
{
struct nlmsghdr hdr;
struct ifinfomsg iface;
struct rtattr attr;
uint8_t data[IFNAMSIZ]; /* IFLA_IFNAME is the only attribute supported */
};
struct getlink_recvfrom_rsplist_s
{
sq_entry_t flink;
struct getlink_recvfrom_response_s payload;
};
struct getlink_response_terminator_s
{
struct nlmsghdr hdr;
struct ifinfomsg iface;
struct rtattr attr;
};
struct getlink_rsplist_terminator_s
{
sq_entry_t flink;
struct getlink_response_terminator_s payload;
};
/* RTM_GETNEIGH: Get neighbor table entry. The message contains an 'ndmsg'
* structure.
*/
struct getneigh_sendto_request_s
{
struct nlmsghdr hdr;
struct ndmsg msg;
};
struct getneigh_recvfrom_response_s
{
struct nlmsghdr hdr;
struct ndmsg msg;
struct rtattr attr;
uint8_t data[1];
};
#define SIZEOF_NLROUTE_RECVFROM_RESPONSE_S(n) \
(sizeof(struct getneigh_recvfrom_response_s) + (n) - 1)
struct getneigh_recvfrom_rsplist_s
{
sq_entry_t flink;
struct getneigh_recvfrom_response_s payload;
};
#define SIZEOF_NLROUTE_RECVFROM_RSPLIST_S(n) \
(sizeof(struct getneigh_recvfrom_rsplist_s) + (n) - 1)
struct nlroute_dev_callback_s
{
FAR struct socket *psock;
FAR const struct getlink_sendto_request_s *req;
};
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Name: netlink_device_callback
*
* Description:
* Handle one device.
*
****************************************************************************/
int netlink_device_callback(FAR struct net_driver_s *dev, FAR void *arg)
{
FAR struct nlroute_dev_callback_s *devcb;
FAR struct getlink_recvfrom_rsplist_s *alloc;
FAR struct getlink_recvfrom_response_s *resp;
DEBUGASSERT(dev != NULL && arg != NULL);
devcb = (FAR struct nlroute_dev_callback_s *)arg;
DEBUGASSERT(devcb->psock != NULL && devcb->req != NULL);
/* Check if the link is in the UP state */
if ((dev->d_flags & IFF_UP) == 0)
{
/* No.. skip this device */
return 0;
}
/* Filter only the requested address families */
switch (devcb->req->gen.rtgen_family)
{
#ifdef CONFIG_NET_LOCAL
case AF_LOCAL:
/* Should have devcb->psock->s_domain == PF_LOCAL and d_lltype ==
* NET_LL_LOOPBACK.
*/
if (devcb->psock->s_domain == PF_LOCAL)
{
DEBUGASSERT(dev->d_lltype == NET_LL_LOOPBACK);
break;
}
else
{
return 0;
}
#endif
#if CONFIG_NET_IPv4
/* Should have devcb->psock->s_domain == PF_INET but d_lltype could be
* several things.
*/
case AF_INET:
if (devcb->psock->s_domain == PF_INET)
{
break;
}
else
{
return 0;
}
#endif
#ifdef CONFIG_NET_IPv6
/* Should have devcb->psock->s_domain == PF_INET6 but d_lltype could be
* several things.
*/
case AF_INET6:
if (devcb->psock->s_domain == PF_INET6)
{
break;
}
else
{
return 0;
}
#endif
#ifdef CONFIG_NET_BLUETOOTH
/* Should have devcb->psock->s_domain == PF_PACKET and d_lltype should be
* NET_LL_BLUETOOTH.
*/
case AF_BLUETOOTH:
if (devcb->psock->s_domain == PF_PACKET)
{
DEBUGASSERT(dev->d_lltype == NET_LL_BLUETOOTH);
break;
}
else
{
return 0;
}
#endif
#if defined(CONFIG_NET_6LOWPAN) || defined(CONFIG_NET_IEEE802154)
/* psock_domain could be PF_PACKET or PF_INET6 but d_lltype should
* be AF_IEEE802154.
*/
case AF_IEEE802154:
if (dev->d_lltype == NET_LL_IEEE802154)
{
DEBUGASSERT(devcb->psock->s_domain == PF_PACKET ||
devcb->psock->s_domain == PF_INET6);
break;
}
else
{
return 0;
}
#endif
#ifdef CONFIG_NET_6LOWPAN
/* psock_domain should be PF_INET6 and d_lltype should be
* NET_LL_PKTRADIO.
*/
if (dev->d_lltype == NET_LL_PKTRADIO)
{
DEBUGASSERT(devcb->psock->s_domain == PF_INET6);
break;
}
else
{
return 0;
}
#endif
case AF_PACKET: /* Take all address families */
break;
case AF_UNSPEC:
case AF_PKTRADIO:
default:
nerr("ERROR: Unsupported address family: %u\n", devcb->req->gen);
return 0;
}
/* Allocate the response buffer */
alloc = (FAR struct getlink_recvfrom_rsplist_s *)
kmm_malloc(sizeof(struct getlink_recvfrom_rsplist_s));
if (alloc == NULL)
{
nerr("ERROR: Failed to allocate response buffer.\n");
return -ENOMEM;
}
/* Initialize the response buffer */
resp = &alloc->payload;
resp->hdr.nlmsg_len = sizeof(struct getlink_recvfrom_response_s);
resp->hdr.nlmsg_type = devcb->req->hdr.nlmsg_type;
resp->hdr.nlmsg_flags = devcb->req->hdr.nlmsg_flags;
resp->hdr.nlmsg_seq = devcb->req->hdr.nlmsg_seq;
resp->hdr.nlmsg_pid = devcb->req->hdr.nlmsg_pid;
resp->iface.ifi_family = devcb->req->gen.rtgen_family;
resp->iface.ifi_pid = devcb->req->hdr.nlmsg_pid;
resp->iface.ifi_type = devcb->req->hdr.nlmsg_type;
#ifdef CONFIG_NETDEV_IFINDEX
resp->iface.ifi_index = dev->dd_ifindex;
#else
resp->iface.ifi_index = 0;
#endif
resp->iface.ifi_flags = devcb->req->hdr.nlmsg_flags;
resp->iface.ifi_change = 0xffffffff;
resp->attr.rta_len = RTA_LENGTH(0) + strnlen(dev->d_ifname, IFNAMSIZ);
resp->attr.rta_type = IFLA_IFNAME;
strncpy((FAR char *)resp->data, dev->d_ifname, IFNAMSIZ);
/* Finally, add the data to the list of pending responses */
netlink_add_response(devcb->psock, (FAR struct netlink_response_s *)alloc);
return 0;
}
/****************************************************************************
* Name: netlink_get_devlist
*
* Description:
* Dump a list of all network devices of the specified type.
*
****************************************************************************/
int netlink_get_devlist(FAR struct socket *psock,
FAR const struct getlink_sendto_request_s *req)
{
struct nlroute_dev_callback_s devcb;
FAR struct getlink_rsplist_terminator_s *alloc;
FAR struct getlink_response_terminator_s *resp;
int ret;
/* Pre-allocate the list terminator */
alloc = (FAR struct getlink_rsplist_terminator_s *)
kmm_malloc(sizeof(struct getlink_rsplist_terminator_s));
if (alloc == NULL)
{
nerr("ERROR: Failed to allocate response terminator.\n");
return -ENOMEM;
}
/* Visit each device */
devcb.psock = psock;
devcb.req = req;
net_lock();
ret = netdev_foreach(netlink_device_callback, &devcb);
if (ret < 0)
{
net_unlock();
return ret;
}
/* Initialize and send the list terminator */
resp = &alloc->payload;
resp->hdr.nlmsg_len = sizeof(struct getlink_response_terminator_s);
resp->hdr.nlmsg_type = req->hdr.nlmsg_type;
resp->hdr.nlmsg_flags = req->hdr.nlmsg_flags;
resp->hdr.nlmsg_seq = req->hdr.nlmsg_seq;
resp->hdr.nlmsg_pid = req->hdr.nlmsg_pid;
resp->iface.ifi_family = req->gen.rtgen_family;
resp->iface.ifi_pid = req->hdr.nlmsg_pid;
resp->iface.ifi_type = req->hdr.nlmsg_type;
resp->iface.ifi_index = 0;
resp->iface.ifi_flags = req->hdr.nlmsg_flags;
resp->iface.ifi_change = 0xffffffff;
resp->attr.rta_len = RTA_LENGTH(0);
resp->attr.rta_type = NLMSG_DONE;
/* Finally, add the data to the list of pending responses */
netlink_add_response(psock, (FAR struct netlink_response_s *)alloc);
net_unlock();
return OK;
}
/****************************************************************************
* Name: netlink_get_arptable()
*
* Description:
* Return the entire ARP table.
*
****************************************************************************/
#ifdef CONFIG_NET_ARP
int netlink_get_arptable(FAR struct socket *psock,
FAR const struct getneigh_sendto_request_s *req)
{
FAR struct getneigh_recvfrom_rsplist_s *entry;
unsigned int ncopied;
size_t tabsize;
size_t rspsize;
size_t allocsize;
/* Preallocate memory to hold the maximum sized ARP table
* REVISIT: This is probably excessively large and could cause false
* memory out conditions. A better approach would be to actually count
* the number of valid entries in the ARP table.
*/
tabsize = CONFIG_NET_ARPTAB_SIZE * sizeof(struct arp_entry_s);
rspsize = SIZEOF_NLROUTE_RECVFROM_RESPONSE_S(tabsize);
allocsize = SIZEOF_NLROUTE_RECVFROM_RSPLIST_S(tabsize);
entry = (FAR struct getneigh_recvfrom_rsplist_s *)kmm_malloc(allocsize);
if (entry == NULL)
{
nerr("ERROR: Failed to allocate response buffer.\n");
return -ENOMEM;
}
/* Populate the entry */
memcpy(&entry->payload.hdr, &req->hdr, sizeof(struct nlmsghdr));
entry->payload.hdr.nlmsg_len = rspsize;
memcpy(&entry->payload.msg, &req->msg, sizeof(struct ndmsg));
entry->payload.attr.rta_len = RTA_LENGTH(0) + tabsize;
entry->payload.attr.rta_type = 0;
/* Lock the network so that the ARP table will be stable, then copy
* the ARP table into the allocated memory.
*/
net_lock();
ncopied = arp_snapshot((FAR struct arp_entry_s *)entry->payload.data,
CONFIG_NET_ARPTAB_SIZE);
net_unlock();
/* Now we have the real number of valid entries in the ARP table and
* we can trim the allocation.
*/
if (ncopied < CONFIG_NET_ARPTAB_SIZE)
{
FAR struct getneigh_recvfrom_rsplist_s *newentry;
tabsize = ncopied * sizeof(struct arp_entry_s);
rspsize = SIZEOF_NLROUTE_RECVFROM_RESPONSE_S(tabsize);
allocsize = SIZEOF_NLROUTE_RECVFROM_RSPLIST_S(tabsize);
newentry = (FAR struct getneigh_recvfrom_rsplist_s *)
kmm_realloc(entry, allocsize);
if (newentry != NULL)
{
entry = newentry;
}
entry->payload.hdr.nlmsg_len = rspsize;
entry->payload.attr.rta_len = RTA_LENGTH(0) + tabsize;
}
/* Finally, add the data to the list of pending responses */
netlink_add_response(psock, (FAR struct netlink_response_s *)entry);
return OK;
}
#endif
/****************************************************************************
* Name: netlink_get_nbtable()
*
* Description:
* Return the entire IPv6 neighbor table.
*
****************************************************************************/
#ifdef CONFIG_NET_IPv6
int netlink_get_nbtable(FAR struct socket *psock,
FAR const struct getneigh_sendto_request_s *req)
{
FAR struct getneigh_recvfrom_rsplist_s *entry;
unsigned int ncopied;
size_t tabsize;
size_t rspsize;
size_t allocsize;
/* Preallocate memory to hold the maximum sized Neighbor table
* REVISIT: This is probably excessively large and could cause false
* memory out conditions. A better approach would be to actually count
* the number of valid entries in the Neighbor table.
*/
tabsize = CONFIG_NET_IPv6_NCONF_ENTRIES *
sizeof(struct neighbor_entry_s);
rspsize = SIZEOF_NLROUTE_RECVFROM_RESPONSE_S(tabsize);
allocsize = SIZEOF_NLROUTE_RECVFROM_RSPLIST_S(tabsize);
entry = (FAR struct getneigh_recvfrom_rsplist_s *)kmm_malloc(allocsize);
if (entry == NULL)
{
nerr("ERROR: Failed to allocate response buffer.\n");
return -ENOMEM;
}
/* Populate the entry */
memcpy(&entry->payload.hdr, &req->hdr, sizeof(struct nlmsghdr));
entry->payload.hdr.nlmsg_len = rspsize;
memcpy(&entry->payload.msg, &req->msg, sizeof(struct ndmsg));
entry->payload.attr.rta_len = RTA_LENGTH(0) + tabsize;
entry->payload.attr.rta_type = 0;
/* Lock the network so that the Neighbor table will be stable, then
* copy the Neighbor table into the allocated memory.
*/
net_lock();
ncopied = neighbor_snapshot((FAR struct neighbor_entry_s *)entry->payload.data,
CONFIG_NET_IPv6_NCONF_ENTRIES);
net_unlock();
/* Now we have the real number of valid entries in the Neighbor table
* and we can trim the allocation.
*/
if (ncopied < CONFIG_NET_IPv6_NCONF_ENTRIES)
{
FAR struct getneigh_recvfrom_rsplist_s *newentry;
tabsize = ncopied * sizeof(struct neighbor_entry_s);
rspsize = SIZEOF_NLROUTE_RECVFROM_RESPONSE_S(tabsize);
allocsize = SIZEOF_NLROUTE_RECVFROM_RSPLIST_S(tabsize);
newentry = (FAR struct getneigh_recvfrom_rsplist_s *)
kmm_realloc(entry, allocsize);
if (newentry != NULL)
{
entry = newentry;
}
entry->payload.hdr.nlmsg_len = rspsize;
entry->payload.attr.rta_len = RTA_LENGTH(0) + tabsize;
}
/* Finally, add the data to the list of pending responses */
netlink_add_response(psock, (FAR struct netlink_response_s *)entry);
return OK;
}
#endif
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: netlink_route_sendto()
*
* Description:
* Perform the sendto() operation for the NETLINK_ROUTE protocol.
*
****************************************************************************/
ssize_t netlink_route_sendto(FAR struct socket *psock,
FAR const struct nlmsghdr *nlmsg,
size_t len, int flags,
FAR const struct sockaddr_nl *to,
socklen_t tolen)
{
FAR const struct getneigh_sendto_request_s *gnreq =
(FAR const struct getneigh_sendto_request_s *)nlmsg;
DEBUGASSERT(psock != NULL && nlmsg != NULL &&
nlmsg->nlmsg_len >= sizeof(struct nlmsghdr) &&
len >= sizeof(struct nlmsghdr) &&
len >= nlmsg->nlmsg_len && to != NULL &&
tolen >= sizeof(struct sockaddr_nl));
/* Dump a list of all devices */
if (gnreq->hdr.nlmsg_type == RTM_GETLINK)
{
FAR const struct getlink_sendto_request_s *glreq =
(FAR const struct getlink_sendto_request_s *)nlmsg;
int ret;
ret = netlink_get_devlist(psock, glreq);
return ret < 0 ? ret : len;
}
#ifdef CONFIG_NET_ARP
/* Retrieve the ARP table in its entirety. */
else if (gnreq->hdr.nlmsg_type == RTM_GETNEIGH &&
gnreq->msg.ndm_family == AF_INET)
{
int ret = netlink_get_arptable(psock, gnreq);
return ret < 0 ? ret : len;
}
#endif
#ifdef CONFIG_NET_IPv6
/* Retrieve the IPv6 neighbor table in its entirety. */
else if (gnreq->hdr.nlmsg_type == RTM_GETNEIGH &&
gnreq->msg.ndm_family == AF_INET6)
{
int ret = netlink_get_nbtable(psock, gnreq);
return ret < 0 ? ret : len;
}
#endif
/* REVISIT: Not implemented */
return -ENOSYS;
}
/****************************************************************************
* Name: netlink_route_recvfrom()
*
* Description:
* Perform the recvfrom() operation for the NETLINK_ROUTE protocol.
*
****************************************************************************/
ssize_t netlink_route_recvfrom(FAR struct socket *psock,
FAR struct nlmsghdr *nlmsg,
size_t len, int flags,
FAR struct sockaddr_nl *from)
{
FAR struct netlink_response_s *entry;
ssize_t ret;
DEBUGASSERT(psock != NULL && nlmsg != NULL &&
len >= sizeof(struct nlmsghdr));
/* Find the response to this message */
net_lock();
entry = (FAR struct netlink_response_s *)netlink_get_response(psock);
net_unlock();
if (entry == NULL)
{
return -ENOENT;
}
if (len < entry->msg.nlmsg_len)
{
kmm_free(entry);
return -EMSGSIZE;
}
/* Handle the response according to the message type */
switch (entry->msg.nlmsg_type)
{
case RTM_GETLINK:
{
FAR struct getlink_recvfrom_rsplist_s *resp =
(FAR struct getlink_recvfrom_rsplist_s *)entry;
/* Copy the payload to the user buffer */
memcpy(nlmsg, &resp->payload, resp->payload.hdr.nlmsg_len);
/* Return address. REVISIT... this is just a guess. */
if (from != NULL)
{
from->nl_family = resp->payload.iface.ifi_family;
from->nl_pad = 0;
from->nl_pid = resp->payload.hdr.nlmsg_pid;
from->nl_groups = resp->payload.hdr.nlmsg_type;
}
/* The return value is the payload size */
ret = resp->payload.hdr.nlmsg_len;
}
break;
case RTM_GETNEIGH:
{
FAR struct getneigh_recvfrom_rsplist_s *resp =
(FAR struct getneigh_recvfrom_rsplist_s *)entry;
/* Copy the payload to the user buffer */
memcpy(nlmsg, &resp->payload, resp->payload.hdr.nlmsg_len);
/* Return address. REVISIT... this is just a guess. */
if (from != NULL)
{
from->nl_family = resp->payload.msg.ndm_family;
from->nl_pad = 0;
from->nl_pid = resp->payload.hdr.nlmsg_pid;
from->nl_groups = resp->payload.hdr.nlmsg_type;
}
/* The return value is the payload size */
ret = resp->payload.hdr.nlmsg_len;
}
break;
default:
nerr("ERROR: Unrecognized message type: %u\n",
entry->msg.nlmsg_type);
ret = -EIO;
break;
}
kmm_free(entry);
return ret;
}
#endif /* CONFIG_NETLINK_ROUTE */
Reference in New Issue View Git Blame Copy Permalink