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Gregory Nutt
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net/icmpv6/icmpv6_rnotify.c
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421
net/icmpv6/icmpv6_rnotify.c
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/****************************************************************************
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* net/icmpv6/icmpv6_rnotify.c
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*
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* Copyright (C) 2015 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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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 <time.h>
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#include <semaphore.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/net/netdev.h>
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#include <arch/irq.h>
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#include "netdev/netdev.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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* Function: 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 bit;
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unsigned int i;
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/* Make sure that the network is down before changing any addresses */
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netdev_ifdown(dev);
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/* Set the network mask. preflen is the number of MS bits under the mask.
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*
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* Eg. preflen = 38
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* NETMASK: ffff ffff fc00 0000 0000 0000 0000 0000
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* bit: 1 1..1
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* 1 1..3 3..4 4..6 6..7 8..9 9..1 1..2
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* 0..5 6..1 2..7 8..3 4..9 0..5 6..1 2..7
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* preflen: 1 1..1
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* 1 1..3 3..4 4..6 6..8 8..9 9..1 1..2
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* 1..6 7..2 3..8 9..4 5..0 1..6 7..2 3..8
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*/
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for (i = 0; i < 7; i++)
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{
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/* bit = {0, 16, 32, 48, 64, 80, 96, 112} */
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bit = i << 4;
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if (preflen > bit)
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{
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/* Eg. preflen = 38, bit = {0, 16, 32} */
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if (preflen > (bit + 16))
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{
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/* Eg. preflen = 38, bit = {0, 16} */
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dev->d_ipv6netmask[i] = 0xffff;
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}
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else
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{
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/* Eg. preflen = 38, bit = {32}
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* bit - preflen = 6
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* make = 0xffff << (16-6)
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* = 0xfc00
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*/
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dev->d_ipv6netmask[i] = 0xffff << (16 - (bit - preflen));
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}
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}
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else
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{
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/* Eg. preflen=38, bit= {48, 64, 80, 112} */
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dev->d_ipv6netmask[i] = 0x0000;
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}
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}
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nvdbg("preflen=%d netmask=%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x\n",
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preflen, dev->d_ipv6netmask[0], dev->d_ipv6netmask[1],
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dev->d_ipv6netmask[2], dev->d_ipv6netmask[3], dev->d_ipv6netmask[4],
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dev->d_ipv6netmask[6], dev->d_ipv6netmask[6], 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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nvdbg("prefix=%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x\n",
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prefix[0], prefix[1], prefix[2], prefix[3],
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prefix[4], prefix[6], prefix[6], prefix[7]);
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nvdbg("IP address=%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x\n",
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dev->d_ipv6addr[0], dev->d_ipv6addr[1], dev->d_ipv6addr[2],
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dev->d_ipv6addr[3], dev->d_ipv6addr[4], dev->d_ipv6addr[6],
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dev->d_ipv6addr[6], 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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nvdbg("DR address=%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x\n",
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dev->d_ipv6draddr[0], dev->d_ipv6draddr[1], dev->d_ipv6draddr[2],
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dev->d_ipv6draddr[3], dev->d_ipv6draddr[4], dev->d_ipv6draddr[6],
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dev->d_ipv6draddr[6], dev->d_ipv6draddr[7]);
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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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* Function: 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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#ifdef CONFIG_NET_MULTILINK
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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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(void)sem_init(¬ify->rn_sem, 0, 0);
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/* Add the wait structure to the list with interrupts disabled */
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flags = irqsave();
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notify->rn_flink = g_icmpv6_rwaiters;
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g_icmpv6_rwaiters = notify;
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irqrestore(flags);
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#else
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/* If there is only a single network device, then there can be only a
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* single waiter.
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*/
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/* Initialize and remember wait structure */
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notify->rn_result = -ETIMEDOUT;
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(void)sem_init(¬ify->rn_sem, 0, 0);
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DEBUGASSERT(g_icmpv6_rwaiters == NULL);
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g_icmpv6_rwaiters = notify;
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#endif
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}
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/****************************************************************************
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* Function: 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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#ifdef CONFIG_NET_MULTILINK
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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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nvdbg("Cancelling...\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 = irqsave();
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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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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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irqrestore(flags);
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(void)sem_destroy(¬ify->rn_sem);
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return ret;
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#else
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nvdbg("Cancelling...\n");
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/* If there is only one network device, then there can be only one entry
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* in the list of waiters.
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*/
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g_icmpv6_rwaiters = NULL;
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(void)sem_destroy(¬ify->rn_sem);
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return OK;
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#endif
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}
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/****************************************************************************
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* Function: 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 un-locked (interrupts may be disabled to keep the things
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* stable).
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*
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****************************************************************************/
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int icmpv6_rwait(FAR struct icmpv6_rnotify_s *notify,
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FAR struct timespec *timeout)
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{
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struct timespec abstime;
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irqstate_t flags;
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int ret;
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nvdbg("Waiting...\n");
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/* And wait for the Neighbor Advertisement (or a timeout). Interrupts will
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* be re-enabled while we wait.
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*/
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flags = irqsave();
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DEBUGVERIFY(clock_gettime(CLOCK_REALTIME, &abstime));
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abstime.tv_sec += timeout->tv_sec;
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abstime.tv_nsec += timeout->tv_nsec;
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if (abstime.tv_nsec > 1000000000)
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{
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abstime.tv_sec++;
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abstime.tv_nsec -= 1000000000;
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}
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/* REVISIT: If sem_timedwait() is awakened with signal, we will return
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* the wrong error code.
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*/
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(void)sem_timedwait(¬ify->rn_sem, &abstime);
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ret = notify->rn_result;
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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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(void)icmpv6_rwait_cancel(notify);
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/* Re-enable interrupts and return the result of the wait */
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irqrestore(flags);
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return ret;
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}
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/****************************************************************************
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* Function: 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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* NOTE: On success the network has the new address applied and is in
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* the down state.
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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, const net_ipv6addr_t draddr,
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const net_ipv6addr_t prefix, unsigned int preflen)
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{
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#ifdef CONFIG_NET_MULTILINK
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FAR struct icmpv6_rnotify_s *curr;
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nvdbg("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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sem_post(&curr->rn_sem);
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break;
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}
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}
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#else
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FAR struct icmpv6_rnotify_s *waiter = g_icmpv6_rwaiters;
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nvdbg("Notified\n");
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if (waiter)
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{
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/* 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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waiter->rn_result = OK;
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sem_post(&waiter->rn_sem);
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}
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#endif
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}
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#endif /* CONFIG_NET_ICMPv6_AUTOCONF */
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