Martine Lenders
8 years ago
committed by
Martine Lenders
9 changed files with 702 additions and 4 deletions
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/*
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* Copyright (C) 2015 Martine Lenders <mlenders@inf.fu-berlin.de> |
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* |
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* This file is subject to the terms and conditions of the GNU Lesser |
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* General Public License v2.1. See the file LICENSE in the top level |
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* directory for more details. |
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*/ |
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/**
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* @defgroup net_gnrc_ndp_router Router-specific part of router discovery. |
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* @ingroup net_gnrc_ndp |
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* @brief Router-specific part for the router discovery in IPv6 |
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* neighbor discovery. |
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* @{ |
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* |
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* @file |
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* @brief Router-specific router discovery definitions |
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* |
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* @author Martine Lenders <mlenders@inf.fu-berlin.de> |
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*/ |
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#ifndef GNRC_NDP_ROUTER_H_ |
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#define GNRC_NDP_ROUTER_H_ |
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#include <stdbool.h> |
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#include "kernel_types.h" |
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#include "net/ipv6/hdr.h" |
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#include "net/ndp.h" |
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#include "net/gnrc/ipv6/nc.h" |
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#include "timex.h" |
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#ifdef __cplusplus |
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extern "C" { |
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#endif |
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/**
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* @brief Set @p iface to router mode. |
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* |
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* @details This sets/unsets the GNRC_IPV6_NETIF_FLAGS_ROUTER and |
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* GNRC_IPV6_NETIF_FLAGS_RTR_ADV and initializes or ceases router |
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* behavior for neighbor discovery. |
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* |
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* @param[in] iface An IPv6 interface. Must not be NULL. |
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* @param[in] enable Status for the GNRC_IPV6_NETIF_FLAGS_ROUTER and |
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* GNRC_IPV6_NETIF_FLAGS_RTR_ADV flags. |
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*/ |
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void gnrc_ndp_router_set_router(gnrc_ipv6_netif_t *iface, bool enable); |
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/**
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* @brief Set/Unset GNRC_IPV6_NETIF_FLAGS_RTR_ADV flag for @p iface. |
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* |
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* @see <a href="https://tools.ietf.org/html/rfc4861#section-6.2.2"> |
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* RFC 4861, section 6.2.2 |
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* </a> |
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* @see <a href="https://tools.ietf.org/html/rfc4861#section-6.2.5"> |
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* RFC 4861, section 6.2.5 |
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* </a> |
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* |
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* @details GNRC_IPV6_NETIF_FLAGS_RTR_ADV and initializes or ceases |
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* periodic router advertising behavior for neighbor discovery. |
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* |
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* @param[in] iface An IPv6 interface. Must not be NULL. |
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* @param[in] enable Status for the GNRC_IPV6_NETIF_FLAGS_RTR_ADV flags. |
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*/ |
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void gnrc_ndp_router_set_rtr_adv(gnrc_ipv6_netif_t *iface, bool enable); |
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/**
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* @brief Send an unsolicited router advertisement over @p iface |
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* and reset the timer for the next one if necessary. |
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* |
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* @param[in] iface An IPv6 interface. |
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*/ |
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void gnrc_ndp_router_retrans_rtr_adv(gnrc_ipv6_netif_t *iface); |
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/**
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* @brief Send an solicited router advertisement to IPv6 address of |
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* @p neighbor. |
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* |
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* @param[in] neighbor A neighbor cache entry. |
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*/ |
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void gnrc_ndp_router_send_rtr_adv(gnrc_ipv6_nc_t *neighbor); |
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#ifdef __cplusplus |
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} |
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#endif |
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#endif /* GNRC_NDP_ROUTER_H_ */ |
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/** @} */ |
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@ -0,0 +1,3 @@
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MODULE = gnrc_ndp_router
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include $(RIOTBASE)/Makefile.base |
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/*
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* Copyright (C) 2015 Martine Lenders <mlenders@inf.fu-berlin.de> |
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* |
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* This file is subject to the terms and conditions of the GNU Lesser |
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* General Public License v2.1. See the file LICENSE in the top level |
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* directory for more details. |
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*/ |
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/**
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* @{ |
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* |
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* @file |
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*/ |
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#include "net/gnrc/ipv6.h" |
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#include "net/gnrc/ndp.h" |
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#include "net/gnrc/ndp/internal.h" |
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#include "random.h" |
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#include "timex.h" |
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#include "vtimer.h" |
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#include "net/gnrc/ndp/router.h" |
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#define ENABLE_DEBUG (0) |
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#include "debug.h" |
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static void _send_rtr_adv(gnrc_ipv6_netif_t *iface, ipv6_addr_t *dst); |
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void gnrc_ndp_router_set_router(gnrc_ipv6_netif_t *iface, bool enable) |
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{ |
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ipv6_addr_t all_routers = IPV6_ADDR_ALL_ROUTERS_LINK_LOCAL; |
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if (enable && !(iface->flags & GNRC_IPV6_NETIF_FLAGS_ROUTER)) { |
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gnrc_ipv6_netif_add_addr(iface->pid, &all_routers, 128, |
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GNRC_IPV6_NETIF_ADDR_FLAGS_NON_UNICAST); |
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mutex_lock(&iface->mutex); |
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iface->flags |= GNRC_IPV6_NETIF_FLAGS_ROUTER; |
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iface->max_adv_int = GNRC_IPV6_NETIF_DEFAULT_MAX_ADV_INT; |
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iface->min_adv_int = GNRC_IPV6_NETIF_DEFAULT_MIN_ADV_INT; |
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iface->adv_ltime = GNRC_IPV6_NETIF_DEFAULT_ROUTER_LTIME; |
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mutex_unlock(&iface->mutex); |
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gnrc_ndp_router_set_rtr_adv(iface, enable); |
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} |
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else if (!enable && (iface->flags & GNRC_IPV6_NETIF_FLAGS_ROUTER)) { |
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gnrc_ipv6_netif_remove_addr(iface->pid, &all_routers); |
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gnrc_ndp_router_set_rtr_adv(iface, enable); |
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} |
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} |
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void gnrc_ndp_router_set_rtr_adv(gnrc_ipv6_netif_t *iface, bool enable) |
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{ |
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if (enable && !(iface->flags & GNRC_IPV6_NETIF_FLAGS_RTR_ADV)) { |
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mutex_lock(&iface->mutex); |
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iface->flags |= GNRC_IPV6_NETIF_FLAGS_RTR_ADV; |
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iface->rtr_adv_count = GNRC_NDP_MAX_INIT_RTR_ADV_NUMOF; |
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mutex_unlock(&iface->mutex); |
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_send_rtr_adv(iface, NULL); |
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} |
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else if (!enable && (iface->flags & GNRC_IPV6_NETIF_FLAGS_RTR_ADV)) { |
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mutex_lock(&iface->mutex); |
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iface->rtr_adv_count = GNRC_NDP_MAX_FIN_RTR_ADV_NUMOF; |
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iface->flags &= ~GNRC_IPV6_NETIF_FLAGS_RTR_ADV; |
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iface->adv_ltime = 0; |
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#ifdef MODULE_GNRC_NDP_HOST |
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iface->rtr_sol_count = GNRC_NDP_MAX_RTR_SOL_NUMOF; |
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#endif |
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mutex_unlock(&iface->mutex); |
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_send_rtr_adv(iface, NULL); |
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#ifdef MODULE_GNRC_NDP_HOST |
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gnrc_ndp_host_retrans_rtr_sol(iface); |
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#endif |
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} |
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} |
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void gnrc_ndp_router_retrans_rtr_adv(gnrc_ipv6_netif_t *iface) |
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{ |
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_send_rtr_adv(iface, NULL); |
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} |
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void gnrc_ndp_router_send_rtr_adv(gnrc_ipv6_nc_t *neighbor) |
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{ |
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gnrc_ipv6_netif_t *iface = gnrc_ipv6_netif_get(neighbor->iface); |
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_send_rtr_adv(iface, &neighbor->ipv6_addr); |
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} |
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static void _send_rtr_adv(gnrc_ipv6_netif_t *iface, ipv6_addr_t *dst) |
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{ |
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bool fin; |
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uint32_t interval; |
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mutex_lock(&iface->mutex); |
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fin = (iface->adv_ltime == 0); |
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interval = genrand_uint32_range(iface->min_adv_int, iface->max_adv_int); |
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if (!fin && !((iface->flags | GNRC_IPV6_NETIF_FLAGS_ROUTER) && |
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(iface->flags | GNRC_IPV6_NETIF_FLAGS_RTR_ADV))) { |
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DEBUG("ndp rtr: interface %" PRIkernel_pid " is not an advertising interface\n", |
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iface->pid); |
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return; |
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} |
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if (iface->rtr_adv_count > 1) { /* regard for off-by-one error */ |
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iface->rtr_adv_count--; |
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if (!fin && (interval > GNRC_NDP_MAX_INIT_RTR_ADV_INT)) { |
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interval = GNRC_NDP_MAX_INIT_RTR_ADV_INT; |
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} |
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} |
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if (!fin || (iface->rtr_adv_count > 1)) { /* regard for off-by-one-error */ |
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/* reset timer for next router advertisement */ |
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vtimer_remove(&iface->rtr_adv_timer); |
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vtimer_set_msg(&iface->rtr_adv_timer, timex_set(interval, 0), |
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gnrc_ipv6_pid, GNRC_NDP_MSG_RTR_ADV_RETRANS, iface); |
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} |
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mutex_unlock(&iface->mutex); |
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for (int i = 0; i < GNRC_IPV6_NETIF_ADDR_NUMOF; i++) { |
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ipv6_addr_t *src = &iface->addrs[i].addr; |
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if (!ipv6_addr_is_unspecified(src) && ipv6_addr_is_link_local(src) && |
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!gnrc_ipv6_netif_addr_is_non_unicast(src)) { |
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/* send one for every link local address (ideally there is only one) */ |
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gnrc_ndp_internal_send_rtr_adv(iface->pid, src, dst, fin); |
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} |
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} |
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} |
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/** @} */ |
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