324 lines
10 KiB
C
324 lines
10 KiB
C
/****************************************************************************
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* net/icmpv6/icmpv6_rnotify.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 <string.h>
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#include <assert.h>
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#include <errno.h>
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#include <debug.h>
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#include <netinet/in.h>
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#include <nuttx/irq.h>
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#include <nuttx/net/net.h>
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#include <nuttx/net/netdev.h>
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#include "netdev/netdev.h"
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#include "utils/utils.h"
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#include "icmpv6/icmpv6.h"
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#ifdef CONFIG_NET_ICMPv6_AUTOCONF
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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/****************************************************************************
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* Private Types
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****************************************************************************/
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/****************************************************************************
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* Private Data
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****************************************************************************/
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/* List of tasks waiting for Neighbor Discover events */
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static struct icmpv6_rnotify_s *g_icmpv6_rwaiters;
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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/****************************************************************************
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* Name: icmpv6_setaddresses
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*
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* Description:
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* We successfully obtained the Router Advertisement. See the new IPv6
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* addresses in the driver structure.
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*
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****************************************************************************/
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static void icmpv6_setaddresses(FAR struct net_driver_s *dev,
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const net_ipv6addr_t draddr,
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const net_ipv6addr_t prefix,
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unsigned int preflen)
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{
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unsigned int i;
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/* Lock the network.
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*
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* NOTE: Normally it is required that the network be in the "down" state
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* when re-configuring the network interface. This is thought not to be
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* a problem here because.
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*
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* 1. The ICMPv6 logic here runs with the network locked so there can be
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* no outgoing packets with bad source IP addresses from any
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* asynchronous network activity using the device being reconfigured.
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* 2. Incoming packets depend only upon the MAC filtering. Network
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* drivers do not use the IP address; they filter incoming packets
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* using only the MAC address which is not being changed here.
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*/
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net_lock();
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/* Create an address mask from the prefix */
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if (preflen > 128)
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{
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preflen = 128;
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}
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net_ipv6_pref2mask(preflen, dev->d_ipv6netmask);
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ninfo("preflen=%d netmask=%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x\n",
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preflen, ntohs(dev->d_ipv6netmask[0]), ntohs(dev->d_ipv6netmask[1]),
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ntohs(dev->d_ipv6netmask[2]), ntohs(dev->d_ipv6netmask[3]),
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ntohs(dev->d_ipv6netmask[4]), ntohs(dev->d_ipv6netmask[5]),
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ntohs(dev->d_ipv6netmask[6]), ntohs(dev->d_ipv6netmask[7]));
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/* Copy prefix to the current IPv6 address, applying the mask */
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for (i = 0; i < 7; i++)
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{
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dev->d_ipv6addr[i] = (dev->d_ipv6addr[i] & ~dev->d_ipv6netmask[i]) |
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(prefix[i] & dev->d_ipv6netmask[i]);
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}
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ninfo("prefix=%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x\n",
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ntohs(prefix[0]), ntohs(prefix[1]), ntohs(prefix[2]),
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ntohs(prefix[3]), ntohs(prefix[4]), ntohs(prefix[5]),
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ntohs(prefix[6]), ntohs(prefix[7]));
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ninfo("IP address=%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x\n",
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ntohs(dev->d_ipv6addr[0]), ntohs(dev->d_ipv6addr[1]),
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ntohs(dev->d_ipv6addr[2]), ntohs(dev->d_ipv6addr[3]),
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ntohs(dev->d_ipv6addr[4]), ntohs(dev->d_ipv6addr[5]),
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ntohs(dev->d_ipv6addr[6]), ntohs(dev->d_ipv6addr[7]));
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/* Finally, copy the router address */
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net_ipv6addr_copy(dev->d_ipv6draddr, draddr);
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ninfo("DR address=%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x\n",
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ntohs(dev->d_ipv6draddr[0]), ntohs(dev->d_ipv6draddr[1]),
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ntohs(dev->d_ipv6draddr[2]), ntohs(dev->d_ipv6draddr[3]),
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ntohs(dev->d_ipv6draddr[4]), ntohs(dev->d_ipv6draddr[5]),
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ntohs(dev->d_ipv6draddr[6]), ntohs(dev->d_ipv6draddr[7]));
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net_unlock();
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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: icmpv6_rwait_setup
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*
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* Description:
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* Called BEFORE an Router Solicitation is sent. This function sets up
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* the Router Advertisement timeout before the Router Solicitation
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* is sent so that there is no race condition when icmpv6_rwait() is
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* called.
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*
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* Assumptions:
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* This function is called from icmpv6_autoconfig() and executes in the
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* normal tasking environment.
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*
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****************************************************************************/
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void icmpv6_rwait_setup(FAR struct net_driver_s *dev,
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FAR struct icmpv6_rnotify_s *notify)
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{
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irqstate_t flags;
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/* Initialize the wait structure */
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memcpy(notify->rn_ifname, dev->d_ifname, IFNAMSIZ);
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notify->rn_result = -ETIMEDOUT;
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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(¬ify->rn_sem, 0, 0);
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nxsem_set_protocol(¬ify->rn_sem, SEM_PRIO_NONE);
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/* Add the wait structure to the list with interrupts disabled */
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flags = enter_critical_section();
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notify->rn_flink = g_icmpv6_rwaiters;
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g_icmpv6_rwaiters = notify;
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leave_critical_section(flags);
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}
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/****************************************************************************
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* Name: icmpv6_rwait_cancel
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*
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* Description:
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* Cancel any wait set after icmpv6_rwait_setup() is called but before
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* icmpv6_rwait()is called (icmpv6_rwait() will automatically cancel the
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* wait).
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*
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* Assumptions:
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* This function may execute in the interrupt context when called from
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* icmpv6_rwait().
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*
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****************************************************************************/
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int icmpv6_rwait_cancel(FAR struct icmpv6_rnotify_s *notify)
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{
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FAR struct icmpv6_rnotify_s *curr;
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FAR struct icmpv6_rnotify_s *prev;
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irqstate_t flags;
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int ret = -ENOENT;
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ninfo("Canceling...\n");
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/* Remove our wait structure from the list (we may no longer be at the
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* head of the list).
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*/
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flags = enter_critical_section();
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for (prev = NULL, curr = g_icmpv6_rwaiters;
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curr && curr != notify;
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prev = curr, curr = curr->rn_flink)
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{
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}
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DEBUGASSERT(curr && curr == notify);
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if (curr)
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{
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if (prev)
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{
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prev->rn_flink = notify->rn_flink;
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}
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else
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{
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g_icmpv6_rwaiters = notify->rn_flink;
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}
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ret = OK;
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}
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leave_critical_section(flags);
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nxsem_destroy(¬ify->rn_sem);
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return ret;
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}
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/****************************************************************************
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* Name: icmpv6_rwait
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*
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* Description:
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* Called each time that a Router Solicitation is sent. This function
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* will sleep until either: (1) the matching Router Advertisement is
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* received, or (2) a timeout occurs.
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*
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* Assumptions:
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* This function is called from icmpv6_autoconfig() and must execute with
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* the network locked.
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*
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****************************************************************************/
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int icmpv6_rwait(FAR struct icmpv6_rnotify_s *notify, unsigned int timeout)
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{
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int ret;
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ninfo("Waiting...\n");
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/* And wait for the Neighbor Advertisement (or a timeout). */
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ret = net_timedwait(¬ify->rn_sem, timeout);
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if (ret >= 0)
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{
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ret = notify->rn_result;
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}
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/* Remove our wait structure from the list (we may no longer be at the
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* head of the list).
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*/
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icmpv6_rwait_cancel(notify);
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return ret;
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}
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/****************************************************************************
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* Name: icmpv6_rnotify
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*
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* Description:
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* Called each time that a Router Advertisement is received in order to
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* wake-up any threads that may be waiting for this particular Router
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* Advertisement.
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*
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* Assumptions:
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* This function is called from the MAC device driver indirectly through
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* icmpv6_icmpv6in() will execute with the network locked.
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*
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****************************************************************************/
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void icmpv6_rnotify(FAR struct net_driver_s *dev,
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const net_ipv6addr_t draddr, const net_ipv6addr_t prefix,
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unsigned int preflen)
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{
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FAR struct icmpv6_rnotify_s *curr;
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ninfo("Notified\n");
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/* Find an entry with the matching device name in the list of waiters */
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for (curr = g_icmpv6_rwaiters; curr; curr = curr->rn_flink)
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{
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/* Does this entry match? If the result is okay, then we have
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* already notified this waiter and it has not yet taken the
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* entry from the list.
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*/
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if (curr->rn_result != OK &&
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strncmp(curr->rn_ifname, dev->d_ifname, IFNAMSIZ) == 0)
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{
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/* Yes.. Set the new network addresses. */
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icmpv6_setaddresses(dev, draddr, prefix, preflen);
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/* And signal the waiting, returning success */
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curr->rn_result = OK;
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nxsem_post(&curr->rn_sem);
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break;
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}
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}
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}
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#endif /* CONFIG_NET_ICMPv6_AUTOCONF */
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