Re-work of thread model
This commit is contained in:
Joseph Henry
543
src/lwipDriver.cpp
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543
src/lwipDriver.cpp
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@@ -0,0 +1,543 @@
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/*
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* ZeroTier SDK - Network Virtualization Everywhere
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* Copyright (C) 2011-2019 ZeroTier, Inc. https://www.zerotier.com/
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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* --
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*
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* You can be released from the requirements of the license by purchasing
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* a commercial license. Buying such a license is mandatory as soon as you
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* develop commercial closed-source software that incorporates or links
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* directly against ZeroTier software without disclosing the source code
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* of your own application.
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*/
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/**
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* @file
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*
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* lwIP network stack driver
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*/
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#include <queue>
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#include "MAC.hpp"
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#include "Mutex.hpp"
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#include "netif/ethernet.h"
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#include "lwip/netif.h"
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#include "lwip/etharp.h"
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#include "lwip/tcpip.h"
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#include "lwip/mem.h"
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#include "lwip/memp.h"
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#include "lwip/sys.h"
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#include "lwip/tcp.h"
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#include "lwip/timeouts.h"
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#include "lwip/stats.h"
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#include "lwip/ethip6.h"
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#include "lwip/ip_addr.h"
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#include "lwip/nd6.h"
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#include "lwip/netifapi.h"
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#include "VirtualTap.hpp"
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#include "lwipDriver.hpp"
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#include "libzt.h"
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#include "Controls.hpp"
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extern void postEvent(uint64_t id, int eventCode);
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#if defined(_WIN32)
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#include <time.h>
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#endif
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/**
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* Length of human-readable MAC address string
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*/
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#define ZTS_MAC_ADDRSTRLEN 18
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namespace ZeroTier {
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bool main_loop_exited = false;
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bool lwip_driver_initialized = false;
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bool has_already_been_initialized = false;
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int hibernationDelayMultiplier = 1;
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extern bool _run_lwip_tcpip;
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Mutex driver_m;
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std::queue<struct zts_sorted_packet*> rx_queue;
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Mutex _rx_input_lock_m;
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void lwip_hibernate_driver()
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{
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hibernationDelayMultiplier = ZTS_HIBERNATION_MULTIPLIER;
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}
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void lwip_wake_driver()
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{
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hibernationDelayMultiplier = 1;
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}
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// Callback for when the TCPIP thread has been successfully started
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static void tcpip_init_done(void *arg)
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{
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sys_sem_t *sem;
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sem = (sys_sem_t *)arg;
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lwip_driver_initialized = true;
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_run_lwip_tcpip = true;
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postEvent((uint64_t)0, ZTS_EVENT_NETWORK_STACK_UP);
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driver_m.unlock();
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sys_sem_signal(sem);
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}
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void my_tcpip_callback(void *arg)
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{
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if (main_loop_exited) {
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return;
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}
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err_t err = ERR_OK;
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int loop_score = LWIP_FRAMES_HANDLED_PER_CORE_CALL; // max num of packets to read per polling call
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while (loop_score > 0) {
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// TODO: Swap this block out for a thread-safe container
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_rx_input_lock_m.lock();
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if (rx_queue.size() == 0) {
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_rx_input_lock_m.unlock();
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return;
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}
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struct zts_sorted_packet *sp = rx_queue.front();
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struct pbuf *p = sp->p;
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rx_queue.pop();
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_rx_input_lock_m.unlock();
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// Feed packet into appropriate lwIP netif
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if (sp->p && sp->n) {
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if ((err = sp->n->input(sp->p, sp->n)) != ERR_OK) {
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DEBUG_ERROR("packet input error (p=%p, n=%p)=%d", p, sp->n, err);
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pbuf_free(p);
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}
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sp->p = NULL;
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}
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delete sp;
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sp = NULL;
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loop_score--;
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}
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}
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// Main thread which starts the initialization process
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static void main_lwip_driver_loop(void *arg)
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{
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#if defined(__linux__)
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pthread_setname_np(pthread_self(), "lwipDriver");
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#endif
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#if defined(__APPLE__)
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pthread_setname_np("lwipDriver");
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#endif
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sys_sem_t sem;
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LWIP_UNUSED_ARG(arg);
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if (sys_sem_new(&sem, 0) != ERR_OK) {
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DEBUG_ERROR("failed to create semaphore");
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}
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tcpip_init(tcpip_init_done, &sem);
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has_already_been_initialized = true;
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sys_sem_wait(&sem);
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while(lwip_driver_initialized) {
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#if defined(_WIN32)
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Sleep(LWIP_GUARDED_BUF_CHECK_INTERVAL*hibernationDelayMultiplier);
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#else
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usleep(LWIP_GUARDED_BUF_CHECK_INTERVAL*1000*hibernationDelayMultiplier);
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#endif
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// Handle incoming packets from the core's thread context.
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// If you feed frames into the core directly you will violate the core's thread model
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tcpip_callback_with_block(my_tcpip_callback, NULL, 1);
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}
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main_loop_exited = true;
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_run_lwip_tcpip = false;
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}
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// Initialize the lwIP stack
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void lwip_driver_init()
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{
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driver_m.lock(); // Unlocked from callback indicating completion of driver init
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if (has_already_been_initialized || lwip_driver_initialized) {
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// Already initialized, skip
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driver_m.unlock();
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return;
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} if (main_loop_exited) {
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DEBUG_ERROR("stack has previously been shutdown an cannot be restarted.");
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driver_m.unlock();
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return;
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}
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#if defined(_WIN32)
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sys_init(); // Required for win32 init of critical sections
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#endif
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void *st = sys_thread_new("main_thread", main_lwip_driver_loop,
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NULL, DEFAULT_THREAD_STACKSIZE, DEFAULT_THREAD_PRIO);
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}
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void lwip_driver_shutdown()
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{
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if (main_loop_exited) {
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return;
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}
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lwip_driver_initialized = false;
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// Give the stack time to call the frame feed callback one last time before shutting everything down
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int callbackInterval = LWIP_GUARDED_BUF_CHECK_INTERVAL*hibernationDelayMultiplier*1000;
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usleep(callbackInterval*3);
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while(!main_loop_exited) {
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usleep(LWIP_GUARDED_BUF_CHECK_INTERVAL*1000);
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}
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/*
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if (tcpip_shutdown() == ERR_OK) {
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sys_timeouts_free();
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}
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*/
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}
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void lwip_dispose_of_netifs(void *tapref)
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{
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VirtualTap *vtap = (VirtualTap*)tapref;
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if (vtap->netif4) {
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netif_remove((struct netif*)(vtap->netif4));
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netif_set_down((struct netif*)(vtap->netif4));
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netif_set_link_down((struct netif*)(vtap->netif4));
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delete vtap->netif4;
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vtap->netif4 = NULL;
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}
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if (vtap->netif6) {
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netif_remove((struct netif*)(vtap->netif6));
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netif_set_down((struct netif*)(vtap->netif6));
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netif_set_link_down((struct netif*)(vtap->netif6));
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delete vtap->netif6;
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vtap->netif6 = NULL;
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}
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}
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err_t lwip_eth_tx(struct netif *netif, struct pbuf *p)
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{
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struct pbuf *q;
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char buf[ZT_MAX_MTU+32];
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char *bufptr;
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int totalLength = 0;
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VirtualTap *tap = (VirtualTap*)netif->state;
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bufptr = buf;
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for (q = p; q != NULL; q = q->next) {
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memcpy(bufptr, q->payload, q->len);
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bufptr += q->len;
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totalLength += q->len;
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}
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struct eth_hdr *ethhdr;
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ethhdr = (struct eth_hdr *)buf;
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MAC src_mac;
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MAC dest_mac;
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src_mac.setTo(ethhdr->src.addr, 6);
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dest_mac.setTo(ethhdr->dest.addr, 6);
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char *data = buf + sizeof(struct eth_hdr);
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int len = totalLength - sizeof(struct eth_hdr);
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int proto = Utils::ntoh((uint16_t)ethhdr->type);
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tap->_handler(tap->_arg, NULL, tap->_nwid, src_mac, dest_mac, proto, 0, data, len);
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/*
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if (ZT_MSG_TRANSFER == true) {
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char flagbuf[32];
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memset(&flagbuf, 0, 32);
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char macBuf[ZTS_MAC_ADDRSTRLEN], nodeBuf[16];
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snprintf(macBuf, ZTS_MAC_ADDRSTRLEN, "%02x:%02x:%02x:%02x:%02x:%02x",
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ethhdr->dest.addr[0], ethhdr->dest.addr[1], ethhdr->dest.addr[2],
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ethhdr->dest.addr[3], ethhdr->dest.addr[4], ethhdr->dest.addr[5]);
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MAC mac;
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mac.setTo(ethhdr->dest.addr, 6);
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mac.toAddress(tap->_nwid).toString(nodeBuf);
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DEBUG_TRANS("len=%5d dst=%s [%s TX <-- %s] proto=0x%04x %s", totalLength, macBuf, nodeBuf, tap->nodeId().c_str(),
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Utils::ntoh(ethhdr->type), flagbuf);
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}
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*/
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return ERR_OK;
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}
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void lwip_eth_rx(VirtualTap *tap, const MAC &from, const MAC &to, unsigned int etherType,
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const void *data, unsigned int len)
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{
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struct pbuf *p,*q;
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struct eth_hdr ethhdr;
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from.copyTo(ethhdr.src.addr, 6);
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to.copyTo(ethhdr.dest.addr, 6);
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ethhdr.type = Utils::hton((uint16_t)etherType);
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/*
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if (ZT_MSG_TRANSFER == true) {
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char flagbuf[32];
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memset(&flagbuf, 0, 32);
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char macBuf[ZTS_MAC_ADDRSTRLEN], nodeBuf[16];
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snprintf(macBuf, ZTS_MAC_ADDRSTRLEN, "%02x:%02x:%02x:%02x:%02x:%02x",
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ethhdr.dest.addr[0], ethhdr.dest.addr[1], ethhdr.dest.addr[2],
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ethhdr.dest.addr[3], ethhdr.dest.addr[4], ethhdr.dest.addr[5]);
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MAC mac;
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mac.setTo(ethhdr.src.addr, 6);
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mac.toAddress(tap->_nwid).toString(nodeBuf);
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DEBUG_TRANS("len=%5d dst=%s [%s RX --> %s] proto=0x%04x %s", len, macBuf, nodeBuf, tap->nodeId().c_str(),
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Utils::ntoh(ethhdr.type), flagbuf);
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}
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*/
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if (etherType == 0x0800 || etherType == 0x0806) { // ip4 or ARP
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if (!tap->netif4) {
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DEBUG_ERROR("dropped packet: no netif to accept this packet (etherType=%x) on this vtap (%p)", etherType, tap);
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return;
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}
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}
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if (etherType == 0x86DD) { // ip6
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if (!tap->netif6) {
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DEBUG_ERROR("dropped packet: no netif to accept this packet (etherType=%x) on this vtap (%p)", etherType, tap);
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return;
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}
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}
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p = pbuf_alloc(PBUF_RAW, len+sizeof(struct eth_hdr), PBUF_RAM);
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if (!p) {
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DEBUG_ERROR("dropped packet: unable to allocate memory for pbuf");
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return;
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}
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// First pbuf gets ethernet header at start
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q = p;
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if (q->len < sizeof(ethhdr)) {
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pbuf_free(p);
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p = NULL;
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DEBUG_ERROR("dropped packet: first pbuf smaller than ethernet header");
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return;
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}
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const char *dataptr = reinterpret_cast<const char *>(data);
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memcpy(q->payload,ðhdr,sizeof(ethhdr));
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int remainingPayloadSpace = q->len - sizeof(ethhdr);
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memcpy((char*)q->payload + sizeof(ethhdr),dataptr,remainingPayloadSpace);
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dataptr += remainingPayloadSpace;
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// Remaining pbufs (if any) get rest of data
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while ((q = q->next)) {
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memcpy(q->payload,dataptr,q->len);
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dataptr += q->len;
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}
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_rx_input_lock_m.lock();
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if (rx_queue.size() >= LWIP_MAX_GUARDED_RX_BUF_SZ) {
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DEBUG_INFO("dropped packet: rx_queue is full (>= %d)", LWIP_MAX_GUARDED_RX_BUF_SZ);
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// TODO: Test performance scenarios: dropping this packet, dropping oldest front packet
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pbuf_free(p);
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p = NULL;
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return;
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}
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// Construct a pre-sorted packet for lwIP packet feeder timeout
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struct zts_sorted_packet *sp = new struct zts_sorted_packet;
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sp->p = p;
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sp->vtap=tap;
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switch (etherType)
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{
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case 0x0800: // ip4
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case 0x0806: // ARP
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sp->n = (struct netif *)tap->netif4;
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break;
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case 0x86DD: // ip6
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sp->n = (struct netif *)tap->netif6;
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break;
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default:
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DEBUG_ERROR("dropped packet: unhandled (etherType=%x)", etherType);
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break;
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}
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rx_queue.push(sp);
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_rx_input_lock_m.unlock();
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}
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static void print_netif_info(struct netif *netif) {
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DEBUG_INFO("n=%p, %c%c, %d, o=%p, o6=%p, mc=%x:%x:%x:%x:%x:%x, hwln=%d, st=%p, flgs=%d\n",
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netif,
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netif->name[0],
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netif->name[1],
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netif->mtu,
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netif->output,
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netif->output_ip6,
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netif->hwaddr[0],
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netif->hwaddr[1],
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netif->hwaddr[2],
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netif->hwaddr[3],
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netif->hwaddr[4],
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netif->hwaddr[5],
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netif->hwaddr_len,
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netif->state,
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netif->flags
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);
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}
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bool lwip_is_netif_up(void *netif)
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{
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return netif_is_up((struct netif*)netif);
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}
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/**
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* Called when the status of a netif changes:
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* - Interface is up/down (ZTS_EVENT_NETIF_UP, ZTS_EVENT_NETIF_DOWN)
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* - Address changes while up (ZTS_EVENT_NETIF_NEW_ADDRESS)
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*/
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static void netif_status_callback(struct netif *netif)
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{
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// TODO: It appears that there may be a bug in lwIP's handling of callbacks for netifs
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// configured to handle ipv4 traffic. For this reason a temporary measure of checking
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// the status of the interfaces ourselves from the service is used.
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if (!netif->state) {
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return;
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}
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VirtualTap *tap = (VirtualTap *)netif->state;
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if (netif->flags & NETIF_FLAG_UP) {
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VirtualTap *vtap = (VirtualTap*)netif->state;
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if (netif == vtap->netif6) {
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// DEBUG_INFO("netif=%p, vtap->netif6=%p", netif, vtap->netif6);
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postEvent(tap->_nwid, ZTS_EVENT_NETIF_UP_IP6);
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}
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if (netif == vtap->netif4) {
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// DEBUG_INFO("netif=%p, vtap->netif4=%p", netif, vtap->netif4);
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postEvent(tap->_nwid, ZTS_EVENT_NETIF_UP_IP4);
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}
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}
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if (!(netif->flags & NETIF_FLAG_UP)) {
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if (netif->flags & NETIF_FLAG_MLD6) {
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postEvent(tap->_nwid, ZTS_EVENT_NETIF_DOWN_IP6);
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} else {
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postEvent(tap->_nwid, ZTS_EVENT_NETIF_DOWN_IP4);
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}
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}
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// TODO: ZTS_EVENT_NETIF_NEW_ADDRESS
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//print_netif_info(netif);
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}
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/**
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* Called when a netif is removed (ZTS_EVENT_NETIF_INTERFACE_REMOVED)
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*/
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static void netif_remove_callback(struct netif *netif)
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{
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if (!netif->state) {
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return;
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}
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VirtualTap *tap = (VirtualTap *)netif->state;
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postEvent(tap->_nwid, ZTS_EVENT_NETIF_REMOVED);
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//print_netif_info(netif);
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}
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/**
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* Called when a link is brought up or down (ZTS_EVENT_NETIF_LINK_UP, ZTS_EVENT_NETIF_LINK_DOWN)
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*/
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static void netif_link_callback(struct netif *netif)
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{
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||||
if (!netif->state) {
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||||
return;
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||||
}
|
||||
VirtualTap *tap = (VirtualTap *)netif->state;
|
||||
if (netif->flags & NETIF_FLAG_LINK_UP) {
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postEvent(tap->_nwid, ZTS_EVENT_NETIF_LINK_UP);
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}
|
||||
if (netif->flags & NETIF_FLAG_LINK_UP) {
|
||||
postEvent(tap->_nwid, ZTS_EVENT_NETIF_LINK_DOWN);
|
||||
}
|
||||
//print_netif_info(netif);
|
||||
}
|
||||
|
||||
static err_t netif_init_4(struct netif *netif)
|
||||
{
|
||||
netif->hwaddr_len = 6;
|
||||
netif->name[0] = 'z';
|
||||
netif->name[1] = '4';
|
||||
netif->linkoutput = lwip_eth_tx;
|
||||
netif->output = etharp_output;
|
||||
netif->mtu = ZT_MAX_MTU;
|
||||
netif->flags = NETIF_FLAG_BROADCAST
|
||||
| NETIF_FLAG_ETHARP
|
||||
| NETIF_FLAG_ETHERNET
|
||||
| NETIF_FLAG_IGMP
|
||||
| NETIF_FLAG_LINK_UP
|
||||
| NETIF_FLAG_UP;
|
||||
netif->hwaddr_len = sizeof(netif->hwaddr);
|
||||
return ERR_OK;
|
||||
}
|
||||
|
||||
static err_t netif_init_6(struct netif *netif)
|
||||
{
|
||||
netif->hwaddr_len = 6;
|
||||
netif->name[0] = 'z';
|
||||
netif->name[1] = '6';
|
||||
netif->linkoutput = lwip_eth_tx;
|
||||
netif->output = etharp_output;
|
||||
netif->output_ip6 = ethip6_output;
|
||||
netif->mtu = ZT_MAX_MTU;
|
||||
netif->flags = NETIF_FLAG_BROADCAST
|
||||
| NETIF_FLAG_ETHARP
|
||||
| NETIF_FLAG_ETHERNET
|
||||
| NETIF_FLAG_IGMP
|
||||
| NETIF_FLAG_MLD6;
|
||||
netif->hwaddr_len = sizeof(netif->hwaddr);
|
||||
return ERR_OK;
|
||||
}
|
||||
|
||||
void lwip_init_interface(void *tapref, const MAC &mac, const InetAddress &ip)
|
||||
{
|
||||
char ipbuf[INET6_ADDRSTRLEN];
|
||||
char macbuf[ZTS_MAC_ADDRSTRLEN];
|
||||
struct netif *n = new struct netif;
|
||||
|
||||
if (ip.isV4()) {
|
||||
char nmbuf[INET6_ADDRSTRLEN];
|
||||
static ip4_addr_t ipaddr, netmask, gw;
|
||||
IP4_ADDR(&gw,127,0,0,1);
|
||||
ipaddr.addr = *((u32_t *)ip.rawIpData());
|
||||
netmask.addr = *((u32_t *)ip.netmask().rawIpData());
|
||||
netif_add(n, &ipaddr, &netmask, &gw, NULL, netif_init_4, tcpip_input);
|
||||
n->state = tapref;
|
||||
mac.copyTo(n->hwaddr, n->hwaddr_len);
|
||||
snprintf(macbuf, ZTS_MAC_ADDRSTRLEN, "%02x:%02x:%02x:%02x:%02x:%02x",
|
||||
n->hwaddr[0], n->hwaddr[1], n->hwaddr[2],
|
||||
n->hwaddr[3], n->hwaddr[4], n->hwaddr[5]);
|
||||
DEBUG_INFO("initialized netif as [mac=%s, addr=%s, nm=%s]",
|
||||
macbuf, ip.toString(ipbuf), ip.netmask().toString(nmbuf));
|
||||
netif_set_up(n);
|
||||
netif_set_link_up(n);
|
||||
VirtualTap *vtap = (VirtualTap*)tapref;
|
||||
vtap->netif4 = (void*)n;
|
||||
}
|
||||
if (ip.isV6())
|
||||
{
|
||||
static ip6_addr_t ipaddr;
|
||||
memcpy(&(ipaddr.addr), ip.rawIpData(), sizeof(ipaddr.addr));
|
||||
n->ip6_autoconfig_enabled = 1;
|
||||
netif_add(n, NULL, NULL, NULL, NULL, netif_init_6, tcpip_input);
|
||||
netif_ip6_addr_set(n, 1, &ipaddr);
|
||||
n->state = tapref;
|
||||
mac.copyTo(n->hwaddr, n->hwaddr_len);
|
||||
netif_create_ip6_linklocal_address(n, 1);
|
||||
netif_ip6_addr_set_state(n, 0, IP6_ADDR_TENTATIVE);
|
||||
netif_ip6_addr_set_state(n, 1, IP6_ADDR_TENTATIVE);
|
||||
netif_set_default(n);
|
||||
netif_set_up(n);
|
||||
netif_set_link_up(n);
|
||||
snprintf(macbuf, ZTS_MAC_ADDRSTRLEN, "%02x:%02x:%02x:%02x:%02x:%02x",
|
||||
n->hwaddr[0], n->hwaddr[1], n->hwaddr[2],
|
||||
n->hwaddr[3], n->hwaddr[4], n->hwaddr[5]);
|
||||
DEBUG_INFO("initialized netif as [mac=%s, addr=%s]",
|
||||
macbuf, ip.toString(ipbuf));
|
||||
VirtualTap *vtap = (VirtualTap*)tapref;
|
||||
vtap->netif6 = (void*)n;
|
||||
}
|
||||
// Set netif callbacks, these will be used to inform decisions made
|
||||
// by the higher level callback monitor thread
|
||||
netif_set_status_callback(n, netif_status_callback);
|
||||
netif_set_remove_callback(n, netif_remove_callback);
|
||||
netif_set_link_callback(n, netif_link_callback);
|
||||
}
|
||||
|
||||
} // namespace ZeroTier
|
||||
Reference in New Issue
Block a user