/**************************************************************************** * net/igmp/igmp_group.c * IGMP group data structure management logic * * Copyright (C) 2010, 2013-2014 Gregory Nutt. All rights reserved. * Author: Gregory Nutt * * The NuttX implementation of IGMP was inspired by the IGMP add-on for the * lwIP TCP/IP stack by Steve Reynolds: * * Copyright (c) 2002 CITEL Technologies Ltd. * All rights reserved. * * 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 of CITEL Technologies Ltd 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 CITEL TECHNOLOGIES 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 CITEL TECHNOLOGIES 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 #include #include #include #include #include #include #include #include #include #include #include #include #include "devif/devif.h" #include "igmp/igmp.h" #ifdef CONFIG_NET_IGMP /**************************************************************************** * Pre-processor Definitions ****************************************************************************/ /* Configuration ************************************************************/ #ifdef CONFIG_NET_IPv6 # error "IGMP for IPv6 not supported" #endif #ifndef CONFIG_PREALLOC_IGMPGROUPS # define CONFIG_PREALLOC_IGMPGROUPS 4 #endif /* Debug ********************************************************************/ #undef IGMP_GRPDEBUG /* Define to enable detailed IGMP group debug */ #ifndef CONFIG_NET_IGMP # undef IGMP_GRPDEBUG #endif #ifdef CONFIG_CPP_HAVE_VARARGS # ifdef IGMP_GRPDEBUG # define grpdbg(format, ...) ndbg(format, ##__VA_ARGS__) # define grplldbg(format, ...) nlldbg(format, ##__VA_ARGS__) # define grpvdbg(format, ...) nvdbg(format, ##__VA_ARGS__) # define grpllvdbg(format, ...) nllvdbg(format, ##__VA_ARGS__) # else # define grpdbg(x...) # define grplldbg(x...) # define grpvdbg(x...) # define grpllvdbg(x...) # endif #else # ifdef IGMP_GRPDEBUG # define grpdbg ndbg # define grplldbg nlldbg # define grpvdbg nvdbg # define grpllvdbg nllvdbg # else # define grpdbg (void) # define grplldbg (void) # define grpvdbg (void) # define grpllvdbg (void) # endif #endif /**************************************************************************** * Private Data ****************************************************************************/ /* kmm_malloc() cannot be called from an interrupt handler. To work around this, * a small number of IGMP groups are preallocated just for use in interrupt * handling logic. */ #if CONFIG_PREALLOC_IGMPGROUPS > 0 static struct igmp_group_s g_preallocgrps[CONFIG_PREALLOC_IGMPGROUPS]; static FAR sq_queue_t g_freelist; #endif /**************************************************************************** * Public Data ****************************************************************************/ /**************************************************************************** * Private Functions ****************************************************************************/ /**************************************************************************** * Name: igmp_grpheapalloc * * Description: * Allocate a new group from heap memory. * * Assumptions: * Calls kmm_malloc and so cannot be called from an interrupt handler. * ****************************************************************************/ static inline FAR struct igmp_group_s *igmp_grpheapalloc(void) { return (FAR struct igmp_group_s *)kzalloc(sizeof(struct igmp_group_s)); } /**************************************************************************** * Name: igmp_grpprealloc * * Description: * Allocate a new group from the pre-allocated groups. * * Assumptions: * This function should only be called from an interrupt handler (or with * interrupts disabled). * ****************************************************************************/ #if CONFIG_PREALLOC_IGMPGROUPS > 0 static inline FAR struct igmp_group_s *igmp_grpprealloc(void) { FAR struct igmp_group_s *group = (FAR struct igmp_group_s *)sq_remfirst(&g_freelist); if (group) { memset(group, 0, sizeof(struct igmp_group_s)); group->flags = IGMP_PREALLOCATED; } return group; } #endif /**************************************************************************** * Public Functions ****************************************************************************/ /**************************************************************************** * Name: igmp_grpinit * * Description: * One-time initialization of group data. * * Assumptions: * Called only during early boot phases (pre-multitasking). * ****************************************************************************/ void igmp_grpinit(void) { FAR struct igmp_group_s *group; int i; grplldbg("Initializing\n"); #if CONFIG_PREALLOC_IGMPGROUPS > 0 for (i = 0; i < CONFIG_PREALLOC_IGMPGROUPS; i++) { group = &g_preallocgrps[i]; sq_addfirst((FAR sq_entry_t *)group, &g_freelist); } #endif } /**************************************************************************** * Name: igmp_grpalloc * * Description: * Allocate a new group from heap memory. * * Assumptions: * May be called from either user or interrupt level processing. * ****************************************************************************/ FAR struct igmp_group_s *igmp_grpalloc(FAR struct net_driver_s *dev, FAR const net_ipaddr_t *addr) { FAR struct igmp_group_s *group; net_lock_t flags; nllvdbg("addr: %08x dev: %p\n", *addr, dev); if (up_interrupt_context()) { #if CONFIG_PREALLOC_IGMPGROUPS > 0 grplldbg("Use a pre-allocated group entry\n"); group = igmp_grpprealloc(); #else grplldbg("Cannot allocate from interrupt handler\n"); group = NULL; #endif } else { grplldbg("Allocate from the heap\n"); group = igmp_grpheapalloc(); } grplldbg("group: %p\n", group); /* Check if we successfully allocated a group structure */ if (group) { /* Initialize the non-zero elements of the group structure */ net_ipaddr_copy(group->grpaddr, *addr); sem_init(&group->sem, 0, 0); /* Initialize the group timer (but don't start it yet) */ group->wdog = wd_create(); DEBUGASSERT(group->wdog); /* Interrupts must be disabled in order to modify the group list */ flags = net_lock(); /* Add the group structure to the list in the device structure */ sq_addfirst((FAR sq_entry_t*)group, &dev->grplist); net_unlock(flags); } return group; } /**************************************************************************** * Name: igmp_grpfind * * Description: * Find an existing group. * * Assumptions: * May be called from either user or interrupt level processing. * ****************************************************************************/ FAR struct igmp_group_s *igmp_grpfind(FAR struct net_driver_s *dev, FAR const net_ipaddr_t *addr) { FAR struct igmp_group_s *group; net_lock_t flags; grplldbg("Searching for addr %08x\n", (int)*addr); /* We must disable interrupts because we don't which context we were * called from. */ flags = net_lock(); for (group = (FAR struct igmp_group_s *)dev->grplist.head; group; group = group->next) { grplldbg("Compare: %08x vs. %08x\n", group->grpaddr, *addr); if (net_ipaddr_cmp(group->grpaddr, *addr)) { grplldbg("Match!\n"); break; } } net_unlock(flags); return group; } /**************************************************************************** * Name: igmp_grpallocfind * * Description: * Find an existing group. If not found, create a new group for the * address. * * Assumptions: * May be called from either user or interrupt level processing. * ****************************************************************************/ FAR struct igmp_group_s *igmp_grpallocfind(FAR struct net_driver_s *dev, FAR const net_ipaddr_t *addr) { FAR struct igmp_group_s *group = igmp_grpfind(dev, addr); grplldbg("group: %p addr: %08x\n", group, (int)*addr); if (!group) { group = igmp_grpalloc(dev, addr); } grplldbg("group: %p\n", group); return group; } /**************************************************************************** * Name: igmp_grpfree * * Description: * Release a previously allocated group. * * Assumptions: * May be called from either user or interrupt level processing. * ****************************************************************************/ void igmp_grpfree(FAR struct net_driver_s *dev, FAR struct igmp_group_s *group) { net_lock_t flags; grplldbg("Free: %p flags: %02x\n", group, group->flags); /* Cancel the wdog */ flags = net_lock(); wd_cancel(group->wdog); /* Remove the group structure from the group list in the device structure */ sq_rem((FAR sq_entry_t*)group, &dev->grplist); /* Destroy the wait semaphore */ (void)sem_destroy(&group->sem); /* Destroy the wdog */ wd_delete(group->wdog); /* Then release the group structure resources. Check first if this is one * of the pre-allocated group structures that we will retain in a free list. */ #if CONFIG_PREALLOC_IGMPGROUPS > 0 if (IS_PREALLOCATED(group->flags)) { grplldbg("Put back on free list\n"); sq_addlast((FAR sq_entry_t*)group, &g_freelist); net_unlock(flags); } else #endif { /* No.. deallocate the group structure. Use sched_kfree() just in case * this function is executing within an interrupt handler. */ net_unlock(flags); grplldbg("Call sched_kfree()\n"); sched_kfree(group); } } #endif /* CONFIG_NET_IGMP */