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- /****************************************************************************
- * net/icmpv6/icmpv6_rnotify.c
- *
- * Copyright (C) 2015-2016 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 <string.h>
- #include <time.h>
- #include <semaphore.h>
- #include <errno.h>
- #include <debug.h>
- #include <netinet/in.h>
- #include <nuttx/irq.h>
- #include <nuttx/semaphore.h>
- #include <nuttx/net/net.h>
- #include <nuttx/net/netdev.h>
- #include "netdev/netdev.h"
- #include "utils/utils.h"
- #include "icmpv6/icmpv6.h"
- #ifdef CONFIG_NET_ICMPv6_AUTOCONF
- /****************************************************************************
- * Pre-processor Definitions
- ****************************************************************************/
- /****************************************************************************
- * Private Types
- ****************************************************************************/
- /****************************************************************************
- * Private Data
- ****************************************************************************/
- /* List of tasks waiting for Neighbor Discover events */
- static struct icmpv6_rnotify_s *g_icmpv6_rwaiters;
- /****************************************************************************
- * Private Functions
- ****************************************************************************/
- /****************************************************************************
- * Name: icmpv6_setaddresses
- *
- * Description:
- * We successfully obtained the Router Advertisement. See the new IPv6
- * addresses in the driver structure.
- *
- ****************************************************************************/
- static void icmpv6_setaddresses(FAR struct net_driver_s *dev,
- const net_ipv6addr_t draddr,
- const net_ipv6addr_t prefix,
- unsigned int preflen)
- {
- unsigned int i;
- /* Lock the network.
- *
- * NOTE: Normally it is required that the network be in the "down" state
- * when re-configuring the network interface. This is thought not to be
- * a problem here because.
- *
- * 1. The ICMPv6 logic here runs with the network locked so there can be
- * no outgoing packets with bad source IP addresses from any
- * asynchronous network activity using the device being reconfigured.
- * 2. Incoming packets depend only upon the MAC filtering. Network
- * drivers do not use the IP address; they filter incoming packets
- * using only the MAC address which is not being changed here.
- */
- net_lock();
- /* Create an address mask from the prefix */
- if (preflen > 128)
- {
- preflen = 128;
- }
- net_ipv6_pref2mask(preflen, dev->d_ipv6netmask);
- ninfo("preflen=%d netmask=%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x\n",
- preflen, dev->d_ipv6netmask[0], dev->d_ipv6netmask[1],
- dev->d_ipv6netmask[2], dev->d_ipv6netmask[3], dev->d_ipv6netmask[4],
- dev->d_ipv6netmask[5], dev->d_ipv6netmask[6], dev->d_ipv6netmask[7]);
- /* Copy prefix to the current IPv6 address, applying the mask */
- for (i = 0; i < 7; i++)
- {
- dev->d_ipv6addr[i] = (dev->d_ipv6addr[i] & ~dev->d_ipv6netmask[i]) |
- (prefix[i] & dev->d_ipv6netmask[i]);
- }
- ninfo("prefix=%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x\n",
- prefix[0], prefix[1], prefix[2], prefix[3],
- prefix[4], prefix[6], prefix[6], prefix[7]);
- ninfo("IP address=%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x\n",
- dev->d_ipv6addr[0], dev->d_ipv6addr[1], dev->d_ipv6addr[2],
- dev->d_ipv6addr[3], dev->d_ipv6addr[4], dev->d_ipv6addr[6],
- dev->d_ipv6addr[6], dev->d_ipv6addr[7]);
- /* Finally, copy the router address */
- net_ipv6addr_copy(dev->d_ipv6draddr, draddr);
- ninfo("DR address=%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x\n",
- dev->d_ipv6draddr[0], dev->d_ipv6draddr[1], dev->d_ipv6draddr[2],
- dev->d_ipv6draddr[3], dev->d_ipv6draddr[4], dev->d_ipv6draddr[6],
- dev->d_ipv6draddr[6], dev->d_ipv6draddr[7]);
- net_unlock();
- }
- /****************************************************************************
- * Public Functions
- ****************************************************************************/
- /****************************************************************************
- * Name: icmpv6_rwait_setup
- *
- * Description:
- * Called BEFORE an Router Solicitation is sent. This function sets up
- * the Router Advertisement timeout before the Router Solicitation
- * is sent so that there is no race condition when icmpv6_rwait() is
- * called.
- *
- * Assumptions:
- * This function is called from icmpv6_autoconfig() and executes in the
- * normal tasking environment.
- *
- ****************************************************************************/
- void icmpv6_rwait_setup(FAR struct net_driver_s *dev,
- FAR struct icmpv6_rnotify_s *notify)
- {
- irqstate_t flags;
- /* Initialize the wait structure */
- memcpy(notify->rn_ifname, dev->d_ifname, IFNAMSIZ);
- notify->rn_result = -ETIMEDOUT;
- /* This semaphore is used for signaling and, hence, should not have
- * priority inheritance enabled.
- */
- (void)nxsem_init(¬ify->rn_sem, 0, 0);
- nxsem_setprotocol(¬ify->rn_sem, SEM_PRIO_NONE);
- /* Add the wait structure to the list with interrupts disabled */
- flags = enter_critical_section();
- notify->rn_flink = g_icmpv6_rwaiters;
- g_icmpv6_rwaiters = notify;
- leave_critical_section(flags);
- }
- /****************************************************************************
- * Name: icmpv6_rwait_cancel
- *
- * Description:
- * Cancel any wait set after icmpv6_rwait_setup() is called but before
- * icmpv6_rwait()is called (icmpv6_rwait() will automatically cancel the
- * wait).
- *
- * Assumptions:
- * This function may execute in the interrupt context when called from
- * icmpv6_rwait().
- *
- ****************************************************************************/
- int icmpv6_rwait_cancel(FAR struct icmpv6_rnotify_s *notify)
- {
- FAR struct icmpv6_rnotify_s *curr;
- FAR struct icmpv6_rnotify_s *prev;
- irqstate_t flags;
- int ret = -ENOENT;
- ninfo("Canceling...\n");
- /* Remove our wait structure from the list (we may no longer be at the
- * head of the list).
- */
- flags = enter_critical_section();
- for (prev = NULL, curr = g_icmpv6_rwaiters;
- curr && curr != notify;
- prev = curr, curr = curr->rn_flink);
- DEBUGASSERT(curr && curr == notify);
- if (curr)
- {
- if (prev)
- {
- prev->rn_flink = notify->rn_flink;
- }
- else
- {
- g_icmpv6_rwaiters = notify->rn_flink;
- }
- ret = OK;
- }
- leave_critical_section(flags);
- (void)nxsem_destroy(¬ify->rn_sem);
- return ret;
- }
- /****************************************************************************
- * Name: icmpv6_rwait
- *
- * Description:
- * Called each time that a Router Solicitation is sent. This function
- * will sleep until either: (1) the matching Router Advertisement is
- * received, or (2) a timeout occurs.
- *
- * Assumptions:
- * This function is called from icmpv6_autoconfig() and must execute with
- * the network locked.
- *
- ****************************************************************************/
- int icmpv6_rwait(FAR struct icmpv6_rnotify_s *notify,
- FAR struct timespec *timeout)
- {
- struct timespec abstime;
- irqstate_t flags;
- int ret;
- ninfo("Waiting...\n");
- /* And wait for the Neighbor Advertisement (or a timeout). Interrupts will
- * be re-enabled while we wait.
- */
- flags = enter_critical_section();
- DEBUGVERIFY(clock_gettime(CLOCK_REALTIME, &abstime));
- abstime.tv_sec += timeout->tv_sec;
- abstime.tv_nsec += timeout->tv_nsec;
- if (abstime.tv_nsec >= 1000000000)
- {
- abstime.tv_sec++;
- abstime.tv_nsec -= 1000000000;
- }
- /* REVISIT: If net_timedwait() is awakened with signal, we will return
- * the wrong error code.
- */
- (void)net_timedwait(¬ify->rn_sem, &abstime);
- ret = notify->rn_result;
- /* Remove our wait structure from the list (we may no longer be at the
- * head of the list).
- */
- (void)icmpv6_rwait_cancel(notify);
- /* Re-enable interrupts and return the result of the wait */
- leave_critical_section(flags);
- return ret;
- }
- /****************************************************************************
- * Name: icmpv6_rnotify
- *
- * Description:
- * Called each time that a Router Advertisement is received in order to
- * wake-up any threads that may be waiting for this particular Router
- * Advertisement.
- *
- * Assumptions:
- * This function is called from the MAC device driver indirectly through
- * icmpv6_icmpv6in() will execute with the network locked.
- *
- ****************************************************************************/
- void icmpv6_rnotify(FAR struct net_driver_s *dev, const net_ipv6addr_t draddr,
- const net_ipv6addr_t prefix, unsigned int preflen)
- {
- FAR struct icmpv6_rnotify_s *curr;
- ninfo("Notified\n");
- /* Find an entry with the matching device name in the list of waiters */
- for (curr = g_icmpv6_rwaiters; curr; curr = curr->rn_flink)
- {
- /* Does this entry match? If the result is okay, then we have
- * already notified this waiter and it has not yet taken the
- * entry from the list.
- */
- if (curr->rn_result != OK &&
- strncmp(curr->rn_ifname, dev->d_ifname, IFNAMSIZ) == 0)
- {
- /* Yes.. Set the new network addresses. */
- icmpv6_setaddresses(dev, draddr, prefix, preflen);
- /* And signal the waiting, returning success */
- curr->rn_result = OK;
- nxsem_post(&curr->rn_sem);
- break;
- }
- }
- }
- #endif /* CONFIG_NET_ICMPv6_AUTOCONF */
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