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incubator-nuttx/net/netlink/netlink_route.c

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/****************************************************************************
* net/netlink/netlink_route.c
*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership. The
* ASF licenses this file to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance with the
* License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations
* under the License.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <sys/types.h>
#include <string.h>
#include <assert.h>
#include <errno.h>
#include <debug.h>
#include <net/route.h>
#include <netpacket/netlink.h>
#include <nuttx/kmalloc.h>
#include <nuttx/net/net.h>
#include <nuttx/net/arp.h>
#include <nuttx/net/ip.h>
#include <nuttx/net/neighbor.h>
#include <nuttx/net/netlink.h>
#include "netdev/netdev.h"
#include "arp/arp.h"
#include "neighbor/neighbor.h"
#include "route/route.h"
#include "netlink/netlink.h"
#ifdef CONFIG_NETLINK_ROUTE
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
/* Configuration ************************************************************/
#if !defined(CONFIG_NET_ARP) && !defined(CONFIG_NET_IPv6)
# undef CONFIG_NETLINK_DISABLE_GETNEIGH
# define CONFIG_NETLINK_DISABLE_GETNEIGH 1
#endif
#if !defined(CONFIG_NET_ROUTE) || (!defined(CONFIG_NET_IPv4) && \
!defined(CONFIG_NET_IPv6))
# undef CONFIG_NETLINK_DISABLE_GETROUTE
# define CONFIG_NETLINK_DISABLE_GETROUTE 1
#endif
/****************************************************************************
* Private Types
****************************************************************************/
/* RTM_GETLINK: Enumerate network devices */
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;
};
/* RTM_GETNEIGH: Get neighbor table entry */
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)
/* RTM_GETROUTE. Get routing tables */
struct getroute_recvfrom_ipv4addr_s
{
struct rtattr attr;
in_addr_t addr;
};
struct getroute_recvfrom_ipv4response_s
{
struct nlmsghdr hdr;
struct rtmsg rte;
struct getroute_recvfrom_ipv4addr_s dst;
struct getroute_recvfrom_ipv4addr_s genmask;
struct getroute_recvfrom_ipv4addr_s gateway;
};
struct getroute_recvfrom_ipv4resplist_s
{
sq_entry_t flink;
struct getroute_recvfrom_ipv4response_s payload;
};
struct getroute_recvfrom_ipv6addr_s
{
struct rtattr attr;
net_ipv6addr_t addr;
};
struct getroute_recvfrom_ipv6response_s
{
struct nlmsghdr hdr;
struct rtmsg rte;
struct getroute_recvfrom_ipv6addr_s dst;
struct getroute_recvfrom_ipv6addr_s genmask;
struct getroute_recvfrom_ipv6addr_s gateway;
};
struct getroute_recvfrom_ipv6resplist_s
{
sq_entry_t flink;
struct getroute_recvfrom_ipv6response_s payload;
};
/* netdev_foreach() callback */
struct nlroute_sendto_request_s
{
struct nlmsghdr hdr;
struct rtgenmsg gen;
};
struct nlroute_info_s
{
NETLINK_HANDLE handle;
FAR const struct nlroute_sendto_request_s *req;
};
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Name: netlink_get_device
*
* Description:
* Generate one device response.
*
****************************************************************************/
#ifndef CONFIG_NETLINK_DISABLE_GETLINK
static FAR struct netlink_response_s *
netlink_get_device(FAR struct net_driver_s *dev,
FAR const struct nlroute_sendto_request_s *req)
{
FAR struct getlink_recvfrom_rsplist_s *alloc;
FAR struct getlink_recvfrom_response_s *resp;
int up = IFF_IS_UP(dev->d_flags);
/* Allocate the response buffer */
alloc = (FAR struct getlink_recvfrom_rsplist_s *)
kmm_zalloc(sizeof(struct getlink_recvfrom_rsplist_s));
if (alloc == NULL)
{
nerr("ERROR: Failed to allocate response buffer.\n");
return NULL;
}
/* Initialize the response buffer */
resp = &alloc->payload;
resp->hdr.nlmsg_len = sizeof(struct getlink_recvfrom_response_s);
resp->hdr.nlmsg_type = up ? RTM_NEWLINK : RTM_DELLINK;
resp->hdr.nlmsg_flags = req ? req->hdr.nlmsg_flags : 0;
resp->hdr.nlmsg_seq = req ? req->hdr.nlmsg_seq : 0;
resp->hdr.nlmsg_pid = req ? req->hdr.nlmsg_pid : 0;
resp->iface.ifi_family = req ? req->gen.rtgen_family : AF_PACKET;
resp->iface.ifi_type = dev->d_lltype;
#ifdef CONFIG_NETDEV_IFINDEX
resp->iface.ifi_index = dev->d_ifindex;
#endif
resp->iface.ifi_flags = dev->d_flags;
resp->iface.ifi_change = 0xffffffff;
resp->attr.rta_len = RTA_LENGTH(strnlen(dev->d_ifname, IFNAMSIZ));
resp->attr.rta_type = IFLA_IFNAME;
strncpy((FAR char *)resp->data, dev->d_ifname, IFNAMSIZ);
/* Finally, return the response */
return (FAR struct netlink_response_s *)alloc;
}
#endif
/****************************************************************************
* Name: netlink_get_terminator
*
* Description:
* Generate one NLMSG_DONE response.
*
****************************************************************************/
static FAR struct netlink_response_s *
netlink_get_terminator(FAR const struct nlroute_sendto_request_s *req)
{
FAR struct netlink_response_s *resp;
FAR struct nlmsghdr *hdr;
/* Allocate the list terminator */
resp = kmm_zalloc(sizeof(struct netlink_response_s));
if (resp == NULL)
{
nerr("ERROR: Failed to allocate response terminator.\n");
return NULL;
}
/* Initialize and send the list terminator */
hdr = &resp->msg;
hdr->nlmsg_len = sizeof(struct nlmsghdr);
hdr->nlmsg_type = NLMSG_DONE;
hdr->nlmsg_flags = req ? req->hdr.nlmsg_flags : 0;
hdr->nlmsg_seq = req ? req->hdr.nlmsg_seq : 0;
hdr->nlmsg_pid = req ? req->hdr.nlmsg_pid : 0;
/* Finally, return the response */
return resp;
}
/****************************************************************************
* Name: netlink_add_terminator
*
* Description:
* Add one NLMSG_DONE response to handle.
*
****************************************************************************/
static int netlink_add_terminator(NETLINK_HANDLE handle,
FAR const struct nlroute_sendto_request_s *req)
{
FAR struct netlink_response_s * resp;
resp = netlink_get_terminator(req);
if (resp == NULL)
{
return -ENOMEM;
}
netlink_add_response(handle, resp);
return OK;
}
/****************************************************************************
* Name: netlink_get_devlist
*
* Description:
* Dump a list of all network devices of the specified type.
*
****************************************************************************/
#ifndef CONFIG_NETLINK_DISABLE_GETLINK
static int netlink_device_callback(FAR struct net_driver_s *dev,
FAR void *arg)
{
FAR struct nlroute_info_s *info = arg;
FAR struct netlink_response_s * resp;
resp = netlink_get_device(dev, info->req);
if (resp == NULL)
{
return -ENOMEM;
}
netlink_add_response(info->handle, resp);
return OK;
}
static int netlink_get_devlist(NETLINK_HANDLE handle,
FAR const struct nlroute_sendto_request_s *req)
{
struct nlroute_info_s info;
int ret;
/* Visit each device */
info.handle = handle;
info.req = req;
net_lock();
ret = netdev_foreach(netlink_device_callback, &info);
net_unlock();
if (ret < 0)
{
return ret;
}
return netlink_add_terminator(handle, req);
}
#endif
/****************************************************************************
* Name: netlink_get_arptable()
*
* Description:
* Return the entire ARP table.
*
****************************************************************************/
#if defined(CONFIG_NET_ARP) && !defined(CONFIG_NETLINK_DISABLE_GETNEIGH)
static int netlink_get_arptable(NETLINK_HANDLE handle,
FAR const struct nlroute_sendto_request_s *req)
{
FAR struct getneigh_recvfrom_rsplist_s *entry;
unsigned int ncopied;
size_t allocsize;
size_t tabsize;
size_t rspsize;
/* 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_zalloc(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;
entry->payload.msg.ndm_family = req->gen.rtgen_family;
entry->payload.attr.rta_len = RTA_LENGTH(tabsize);
/* 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(tabsize);
}
/* Finally, add the data to the list of pending responses */
netlink_add_response(handle, (FAR struct netlink_response_s *)entry);
return OK;
}
#endif
/****************************************************************************
* Name: netlink_get_nbtable()
*
* Description:
* Return the entire IPv6 neighbor table.
*
****************************************************************************/
#if defined(CONFIG_NET_IPv6) && !defined(CONFIG_NETLINK_DISABLE_GETNEIGH)
static int netlink_get_nbtable(NETLINK_HANDLE handle,
FAR const struct nlroute_sendto_request_s *req)
{
FAR struct getneigh_recvfrom_rsplist_s *entry;
unsigned int ncopied;
size_t allocsize;
size_t tabsize;
size_t rspsize;
/* 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_zalloc(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;
entry->payload.msg.ndm_family = req->gen.rtgen_family;
entry->payload.attr.rta_len = RTA_LENGTH(tabsize);
/* 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(tabsize);
}
/* Finally, add the response to the list of pending responses */
netlink_add_response(handle, (FAR struct netlink_response_s *)entry);
return OK;
}
#endif
/****************************************************************************
* Name: netlink_ipv4_route
*
* Description:
* Dump a list of all network devices of the specified type.
*
****************************************************************************/
#if defined(CONFIG_NET_IPv4) && !defined(CONFIG_NETLINK_DISABLE_GETROUTE)
static int netlink_ipv4_route(FAR struct net_route_ipv4_s *route,
FAR void *arg)
{
FAR struct getroute_recvfrom_ipv4resplist_s *alloc;
FAR struct getroute_recvfrom_ipv4response_s *resp;
FAR struct nlroute_info_s *info;
DEBUGASSERT(route != NULL && arg != NULL);
info = (FAR struct nlroute_info_s *)arg;
/* Allocate the response */
alloc = (FAR struct getroute_recvfrom_ipv4resplist_s *)
kmm_zalloc(sizeof(struct getroute_recvfrom_ipv4resplist_s));
if (alloc == NULL)
{
return -ENOMEM;
}
/* Format the response */
resp = &alloc->payload;
resp->hdr.nlmsg_len = sizeof(struct getroute_recvfrom_ipv4response_s);
resp->hdr.nlmsg_type = RTM_NEWROUTE;
resp->hdr.nlmsg_flags = info->req->hdr.nlmsg_flags;
resp->hdr.nlmsg_seq = info->req->hdr.nlmsg_seq;
resp->hdr.nlmsg_pid = info->req->hdr.nlmsg_pid;
resp->rte.rtm_family = info->req->gen.rtgen_family;
resp->rte.rtm_table = RT_TABLE_MAIN;
resp->rte.rtm_protocol = RTPROT_STATIC;
resp->rte.rtm_scope = RT_SCOPE_SITE;
resp->dst.attr.rta_len = RTA_LENGTH(sizeof(in_addr_t));
resp->dst.attr.rta_type = RTA_DST;
resp->dst.addr = route->target;
resp->genmask.attr.rta_len = RTA_LENGTH(sizeof(in_addr_t));
resp->genmask.attr.rta_type = RTA_GENMASK;
resp->genmask.addr = route->netmask;
resp->gateway.attr.rta_len = RTA_LENGTH(sizeof(in_addr_t));
resp->gateway.attr.rta_type = RTA_GATEWAY;
resp->gateway.addr = route->router;
/* Finally, add the response to the list of pending responses */
netlink_add_response(info->handle, (FAR struct netlink_response_s *)alloc);
return OK;
}
#endif
/****************************************************************************
* Name: netlink_get_ipv4route
*
* Description:
* Dump a list of all network devices of the specified type.
*
****************************************************************************/
#if defined(CONFIG_NET_IPv4) && !defined(CONFIG_NETLINK_DISABLE_GETROUTE)
static int netlink_get_ipv4route(NETLINK_HANDLE handle,
FAR const struct nlroute_sendto_request_s *req)
{
struct nlroute_info_s info;
int ret;
/* Visit each routing table entry */
info.handle = handle;
info.req = req;
ret = net_foreachroute_ipv4(netlink_ipv4_route, &info);
if (ret < 0)
{
return ret;
}
/* Terminate the routing table */
return netlink_add_terminator(handle, req);
}
#endif
/****************************************************************************
* Name: netlink_ipv6_route
*
* Description:
* Dump a list of all network devices of the specified type.
*
****************************************************************************/
#if defined(CONFIG_NET_IPv6) && !defined(CONFIG_NETLINK_DISABLE_GETROUTE)
static int netlink_ipv6_route(FAR struct net_route_ipv6_s *route,
FAR void *arg)
{
FAR struct getroute_recvfrom_ipv6resplist_s *alloc;
FAR struct getroute_recvfrom_ipv6response_s *resp;
FAR struct nlroute_info_s *info;
DEBUGASSERT(route != NULL && arg != NULL);
info = (FAR struct nlroute_info_s *)arg;
/* Allocate the response */
alloc = (FAR struct getroute_recvfrom_ipv6resplist_s *)
kmm_zalloc(sizeof(struct getroute_recvfrom_ipv6resplist_s));
if (alloc == NULL)
{
return -ENOMEM;
}
/* Format the response */
resp = &alloc->payload;
resp->hdr.nlmsg_len = sizeof(struct getroute_recvfrom_ipv6response_s);
resp->hdr.nlmsg_type = RTM_NEWROUTE;
resp->hdr.nlmsg_flags = info->req->hdr.nlmsg_flags;
resp->hdr.nlmsg_seq = info->req->hdr.nlmsg_seq;
resp->hdr.nlmsg_pid = info->req->hdr.nlmsg_pid;
resp->rte.rtm_family = info->req->gen.rtgen_family;
resp->rte.rtm_table = RT_TABLE_MAIN;
resp->rte.rtm_protocol = RTPROT_STATIC;
resp->rte.rtm_scope = RT_SCOPE_SITE;
resp->dst.attr.rta_len = RTA_LENGTH(sizeof(net_ipv6addr_t));
resp->dst.attr.rta_type = RTA_DST;
net_ipv6addr_copy(resp->dst.addr, route->target);
resp->genmask.attr.rta_len = RTA_LENGTH(sizeof(net_ipv6addr_t));
resp->genmask.attr.rta_type = RTA_GENMASK;
net_ipv6addr_copy(resp->genmask.addr, route->netmask);
resp->gateway.attr.rta_len = RTA_LENGTH(sizeof(net_ipv6addr_t));
resp->gateway.attr.rta_type = RTA_GATEWAY;
net_ipv6addr_copy(resp->gateway.addr, route->router);
/* Finally, add the response to the list of pending responses */
netlink_add_response(info->handle, (FAR struct netlink_response_s *)alloc);
return OK;
}
#endif
/****************************************************************************
* Name: netlink_get_ip6vroute
*
* Description:
* Dump a list of all network devices of the specified type.
*
****************************************************************************/
#if defined(CONFIG_NET_IPv6) && !defined(CONFIG_NETLINK_DISABLE_GETROUTE)
static int netlink_get_ip6vroute(NETLINK_HANDLE handle,
FAR const struct nlroute_sendto_request_s *req)
{
struct nlroute_info_s info;
int ret;
/* Visit each routing table entry */
info.handle = handle;
info.req = req;
ret = net_foreachroute_ipv6(netlink_ipv6_route, &info);
if (ret < 0)
{
return ret;
}
/* Terminate the routing table */
return netlink_add_terminator(handle, req);
}
#endif
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: netlink_route_sendto()
*
* Description:
* Perform the sendto() operation for the NETLINK_ROUTE protocol.
*
****************************************************************************/
ssize_t netlink_route_sendto(NETLINK_HANDLE handle,
FAR const struct nlmsghdr *nlmsg,
size_t len, int flags,
FAR const struct sockaddr_nl *to,
socklen_t tolen)
{
FAR const struct nlroute_sendto_request_s *req =
(FAR const struct nlroute_sendto_request_s *)nlmsg;
int ret;
DEBUGASSERT(handle != NULL && nlmsg != NULL &&
nlmsg->nlmsg_len >= sizeof(struct nlmsghdr) &&
len >= sizeof(struct nlmsghdr) &&
len >= nlmsg->nlmsg_len && to != NULL &&
tolen >= sizeof(struct sockaddr_nl));
/* Handle according to the message type */
switch (nlmsg->nlmsg_type)
{
#ifndef CONFIG_NETLINK_DISABLE_GETLINK
/* Dump a list of all devices */
case RTM_GETLINK:
/* Generate the response */
ret = netlink_get_devlist(handle, req);
break;
#endif
#ifndef CONFIG_NETLINK_DISABLE_GETNEIGH
/* Retrieve ARP/Neighbor Tables */
case RTM_GETNEIGH:
#ifdef CONFIG_NET_ARP
/* Retrieve the ARP table in its entirety. */
if (req->gen.rtgen_family == AF_INET)
{
ret = netlink_get_arptable(handle, req);
}
else
#endif
#ifdef CONFIG_NET_IPv6
/* Retrieve the IPv6 neighbor table in its entirety. */
if (req->gen.rtgen_family == AF_INET6)
{
ret = netlink_get_nbtable(handle, req);
}
else
#endif
{
ret = -EAFNOSUPPORT;
}
break;
#endif /* !CONFIG_NETLINK_DISABLE_GETNEIGH */
#ifndef CONFIG_NETLINK_DISABLE_GETROUTE
/* Retrieve the IPv4 or IPv6 routing table */
case RTM_GETROUTE:
#ifdef CONFIG_NET_IPv4
if (req->gen.rtgen_family == AF_INET)
{
ret = netlink_get_ipv4route(handle, req);
}
else
#endif
#ifdef CONFIG_NET_IPv6
if (req->gen.rtgen_family == AF_INET6)
{
ret = netlink_get_ip6vroute(handle, req);
}
else
#endif
{
ret = -EAFNOSUPPORT;
}
break;
#endif
default:
ret = -ENOSYS;
break;
}
/* On success, return the size of the request that was processed */
if (ret >= 0)
{
ret = len;
}
return ret;
}
/****************************************************************************
* Name: netlink_device_notify()
*
* Description:
* Perform the route broadcast for the NETLINK_ROUTE protocol.
*
****************************************************************************/
#ifndef CONFIG_NETLINK_DISABLE_GETLINK
void netlink_device_notify(FAR struct net_driver_s *dev)
{
FAR struct netlink_response_s *resp;
DEBUGASSERT(dev != NULL);
resp = netlink_get_device(dev, NULL);
if (resp != NULL)
{
netlink_add_broadcast(RTNLGRP_LINK, resp);
resp = netlink_get_terminator(NULL);
if (resp != NULL)
{
netlink_add_broadcast(RTNLGRP_LINK, resp);
}
}
}
#endif
#endif /* CONFIG_NETLINK_ROUTE */
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