385 lines
11 KiB
C
385 lines
11 KiB
C
/****************************************************************************
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* net/arp/arp_send.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 <unistd.h>
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#include <string.h>
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#include <debug.h>
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#include <netinet/in.h>
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#include <net/if.h>
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#include <nuttx/net/net.h>
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#include <nuttx/net/netdev.h>
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#include <nuttx/net/ip.h>
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#include <nuttx/net/arp.h>
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#include "netdev/netdev.h"
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#include "devif/devif.h"
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#include "route/route.h"
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#include "arp/arp.h"
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#ifdef CONFIG_NET_ARP_SEND
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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/****************************************************************************
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* Name: arp_send_terminate
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****************************************************************************/
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static void arp_send_terminate(FAR struct arp_send_s *state, int result)
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{
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/* Don't allow any further call backs. */
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state->snd_sent = true;
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state->snd_result = (int16_t)result;
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state->snd_cb->flags = 0;
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state->snd_cb->priv = NULL;
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state->snd_cb->event = NULL;
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/* Wake up the waiting thread */
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nxsem_post(&state->snd_sem);
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}
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/****************************************************************************
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* Name: arp_send_eventhandler
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****************************************************************************/
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static uint16_t arp_send_eventhandler(FAR struct net_driver_s *dev,
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FAR void *pvconn,
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FAR void *priv, uint16_t flags)
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{
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FAR struct arp_send_s *state = (FAR struct arp_send_s *)priv;
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ninfo("flags: %04x sent: %d\n", flags, state->snd_sent);
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if (state)
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{
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/* Is this the device that we need to route this request? */
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if (strncmp((FAR const char *)dev->d_ifname,
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(FAR const char *)state->snd_ifname, IFNAMSIZ) != 0)
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{
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/* No... pass on this one and wait for the device that we want */
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return flags;
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}
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/* Check if the network is still up */
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if ((flags & NETDEV_DOWN) != 0)
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{
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nerr("ERROR: Interface is down\n");
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arp_send_terminate(state, -ENETUNREACH);
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return flags;
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}
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/* Check if the outgoing packet is available. It may have been claimed
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* by a send event handler serving a different thread -OR- if the
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* output buffer currently contains unprocessed incoming data. In
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* these cases we will just have to wait for the next polling cycle.
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*/
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if (dev->d_sndlen > 0 || (flags & PKT_NEWDATA) != 0)
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{
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/* Another thread has beat us sending data or the buffer is busy,
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* Check for a timeout. If not timed out, wait for the next
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* polling cycle and check again.
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*/
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/* REVISIT: No timeout. Just wait for the next polling cycle */
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return flags;
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}
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/* It looks like we are good to send the data.
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*
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* Copy the packet data into the device packet buffer and send it.
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*/
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arp_format(dev, state->snd_ipaddr);
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/* Make sure no ARP request overwrites this ARP request. This
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* flag will be cleared in arp_out().
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*/
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IFF_SET_NOARP(dev->d_flags);
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/* Don't allow any further call backs. */
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arp_send_terminate(state, OK);
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}
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return flags;
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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: arp_send
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*
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* Description:
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* The arp_send() call may be to send an ARP request to resolve an IP
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* address. This function first checks if the IP address is already in
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* ARP table. If so, then it returns success immediately.
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*
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* If the requested IP address in not in the ARP table, then this function
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* will send an ARP request, delay, then check if the IP address is now in
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* the ARP table. It will repeat this sequence until either (1) the IP
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* address mapping is now in the ARP table, or (2) a configurable number
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* of timeouts occur without receiving the ARP replay.
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*
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* Input Parameters:
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* ipaddr The IP address to be queried (in network order).
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*
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* Returned Value:
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* Zero (OK) is returned on success and the IP address mapping can now be
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* found in the ARP table. On error a negated errno value is returned:
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*
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* -ETIMEDOUT: The number or retry counts has been exceed.
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* -EHOSTUNREACH: Could not find a route to the host
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*
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* Assumptions:
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* This function is called from the normal tasking context.
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*
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****************************************************************************/
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int arp_send(in_addr_t ipaddr)
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{
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FAR struct net_driver_s *dev;
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struct arp_notify_s notify;
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struct arp_send_s state;
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int ret;
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/* First check if destination is a local broadcast. */
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if (ipaddr == INADDR_BROADCAST)
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{
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/* We don't need to send the ARP request */
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return OK;
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}
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#ifdef CONFIG_NET_IGMP
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/* Check if the destination address is a multicast address
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*
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* - IPv4: multicast addresses lie in the class D group -- The address
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* range 224.0.0.0 to 239.255.255.255 (224.0.0.0/4)
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*
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* - IPv6 multicast addresses are have the high-order octet of the
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* addresses=0xff (ff00::/8.)
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*/
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if (NTOHL(ipaddr) >= 0xe0000000 && NTOHL(ipaddr) <= 0xefffffff)
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{
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/* We don't need to send the ARP request */
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return OK;
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}
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#endif
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/* Get the device that can route this request */
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dev = netdev_findby_ripv4addr(INADDR_ANY, ipaddr);
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if (!dev)
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{
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nerr("ERROR: Unreachable: %08lx\n", (unsigned long)ipaddr);
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ret = -EHOSTUNREACH;
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goto errout;
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}
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/* ARP support is only built if the Ethernet link layer is supported.
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* Continue and send the ARP request only if this device uses the
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* Ethernet link layer protocol.
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*/
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if (dev->d_lltype != NET_LL_ETHERNET &&
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dev->d_lltype != NET_LL_IEEE80211)
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{
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return OK;
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}
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/* Check if the destination address is on the local network. */
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if (!net_ipv4addr_maskcmp(ipaddr, dev->d_ipaddr, dev->d_netmask))
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{
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in_addr_t dripaddr;
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/* Destination address is not on the local network */
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#ifdef CONFIG_NET_ROUTE
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/* We have a routing table.. find the correct router to use in
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* this case (or, as a fall-back, use the device's default router
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* address). We will use the router IP address instead of the
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* destination address when determining the MAC address.
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*/
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netdev_ipv4_router(dev, ipaddr, &dripaddr);
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#else
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/* Use the device's default router IP address instead of the
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* destination address when determining the MAC address.
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*/
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net_ipv4addr_copy(dripaddr, dev->d_draddr);
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#endif
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ipaddr = dripaddr;
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}
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/* The destination address is on the local network. Check if it is
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* the sub-net broadcast address.
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*/
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else if (net_ipv4addr_broadcast(ipaddr, dev->d_netmask))
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{
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/* Yes.. We don't need to send the ARP request */
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return OK;
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}
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/* Allocate resources to receive a callback. This and the following
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* initialization is performed with the network lock because we don't
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* want anything to happen until we are ready.
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*/
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net_lock();
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state.snd_cb = arp_callback_alloc(dev);
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if (!state.snd_cb)
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{
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nerr("ERROR: Failed to allocate a callback\n");
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ret = -ENOMEM;
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goto errout_with_lock;
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}
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/* This semaphore is used for signaling and, hence, should not have
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* priority inheritance enabled.
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*/
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nxsem_init(&state.snd_sem, 0, 0); /* Doesn't really fail */
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nxsem_set_protocol(&state.snd_sem, SEM_PRIO_NONE);
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state.snd_retries = 0; /* No retries yet */
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state.snd_ipaddr = ipaddr; /* IP address to query */
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/* Remember the routing device name */
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strncpy((FAR char *)state.snd_ifname, (FAR const char *)dev->d_ifname,
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IFNAMSIZ);
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/* Now loop, testing if the address mapping is in the ARP table and re-
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* sending the ARP request if it is not.
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*/
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ret = -ETIMEDOUT; /* Assume a timeout failure */
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while (state.snd_retries < CONFIG_ARP_SEND_MAXTRIES)
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{
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/* Check if the address mapping is present in the ARP table. This
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* is only really meaningful on the first time through the loop.
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*
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* NOTE: If the ARP table is large than this could be a performance
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* issue.
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*/
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if (arp_find(ipaddr, NULL) >= 0)
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{
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/* We have it! Break out with success */
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ret = OK;
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break;
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}
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/* Set up the ARP response wait BEFORE we send the ARP request */
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arp_wait_setup(ipaddr, ¬ify);
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/* Arm/re-arm the callback */
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state.snd_sent = false;
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state.snd_result = -EBUSY;
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state.snd_cb->flags = (ARP_POLL | NETDEV_DOWN);
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state.snd_cb->priv = (FAR void *)&state;
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state.snd_cb->event = arp_send_eventhandler;
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/* Notify the device driver that new TX data is available. */
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netdev_txnotify_dev(dev);
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/* Wait for the send to complete or an error to occur.
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* net_lockedwait will also terminate if a signal is received.
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*/
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do
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{
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net_lockedwait(&state.snd_sem);
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}
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while (!state.snd_sent);
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/* Check the result of the send operation */
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ret = state.snd_result;
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if (ret < 0)
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{
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/* Break out on a send failure */
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nerr("ERROR: Send failed: %d\n", ret);
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break;
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}
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/* Now wait for response to the ARP response to be received. */
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ret = arp_wait(¬ify, CONFIG_ARP_SEND_DELAYMSEC);
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/* arp_wait will return OK if and only if the matching ARP response
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* is received. Otherwise, it will return -ETIMEDOUT.
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*/
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if (ret >= OK)
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{
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/* Break out if arp_wait() fails */
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break;
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}
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/* Increment the retry count */
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state.snd_retries++;
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nerr("ERROR: arp_wait failed: %d\n", ret);
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}
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nxsem_destroy(&state.snd_sem);
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arp_callback_free(dev, state.snd_cb);
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errout_with_lock:
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net_unlock();
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errout:
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return ret;
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}
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#endif /* CONFIG_NET_ARP_SEND */
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