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FlowTable.cc
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FlowTable.cc
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#include <iostream>
#include <stdio.h>
#include <netinet/ether.h>
#include <arpa/inet.h>
#include <netdb.h>
#include <sys/socket.h>
#include "ipc/RFProtocol.h"
#include "converter.h"
#include "defs.h"
#include "FlowTable.h"
using namespace std;
#define FULL_IPV4_MASK "255.255.255.255"
#define EMPTY_MAC_ADDRESS "00:00:00:00:00:00"
struct rtnl_handle FlowTable::rthNeigh;
struct rtnl_handle FlowTable::rth;
int FlowTable::family = AF_UNSPEC;
unsigned FlowTable::groups = ~0U;
int FlowTable::llink = 0;
int FlowTable::laddr = 0;
int FlowTable::lroute = 0;
boost::thread FlowTable::HTPolling;
boost::thread FlowTable::RTPolling;
map<string, Interface> FlowTable::interfaces;
vector<uint32_t>* FlowTable::down_ports;
IPCMessageService* FlowTable::ipc;
uint64_t FlowTable::vm_id;
list<RouteEntry> FlowTable::routeTable;
list<HostEntry> FlowTable::hostTable;
// TODO: implement a way to pause the flow table updates when the VM is not associated with a valid datapath
void FlowTable::HTPollingCb() {
rtnl_listen(&rthNeigh, FlowTable::updateHostTable, NULL);
}
void FlowTable::RTPollingCb() {
rtnl_listen(&rth, FlowTable::updateRouteTable, NULL);
}
void FlowTable::clear() {
FlowTable::routeTable.clear();
FlowTable::hostTable.clear();
}
void FlowTable::start(uint64_t vm_id, map<string, Interface> interfaces, IPCMessageService* ipc, vector<uint32_t>* down_ports) {
FlowTable::vm_id = vm_id;
FlowTable::interfaces = interfaces;
FlowTable::ipc = ipc;
FlowTable::down_ports = down_ports;
rtnl_open(&rth, RTMGRP_IPV4_MROUTE | RTMGRP_IPV4_ROUTE | RTMGRP_IPV6_MROUTE | RTMGRP_IPV6_ROUTE);
rtnl_open(&rthNeigh, RTMGRP_NEIGH);
HTPolling = boost::thread(&FlowTable::HTPollingCb);
RTPolling = boost::thread(&FlowTable::RTPollingCb);
HTPolling.detach();
RTPolling.detach();
}
int FlowTable::updateHostTable(const struct sockaddr_nl *who, struct nlmsghdr *n, void *arg) {
struct ndmsg *ndmsg_ptr = (struct ndmsg *) NLMSG_DATA(n);
struct rtattr *rtattr_ptr;
char intf[IF_NAMESIZE + 1];
memset(intf, 0, IF_NAMESIZE + 1);
if (if_indextoname((unsigned int) ndmsg_ptr->ndm_ifindex, (char *) intf) == NULL) {
return 0;
}
/*
if (ndmsg_ptr->ndm_state != NUD_REACHABLE) {
cout << "ndm_state: " << (uint16_t) ndmsg_ptr->ndm_state << endl;
return 0;
}
*/
char ip[INET_ADDRSTRLEN];
char mac[2 * IFHWADDRLEN + 5 + 1];
memset(ip, 0, INET_ADDRSTRLEN);
memset(mac, 0, 2 * IFHWADDRLEN + 5 + 1);
rtattr_ptr = (struct rtattr *) RTM_RTA(ndmsg_ptr);
int rtmsg_len = RTM_PAYLOAD(n);
for (; RTA_OK(rtattr_ptr, rtmsg_len); rtattr_ptr = RTA_NEXT(rtattr_ptr, rtmsg_len)) {
switch (rtattr_ptr->rta_type) {
case RTA_DST:
if (inet_ntop(AF_INET, RTA_DATA(rtattr_ptr), ip, 128) == NULL)
return 0;
break;
case NDA_LLADDR:
if (strncpy(mac, ether_ntoa(((ether_addr *) RTA_DATA(rtattr_ptr))), sizeof(mac)) == NULL)
return 0;
break;
default:
break;
}
}
HostEntry hentry;
map<string, Interface>::iterator it;
hentry.address = IPAddress(IPV4, ip);
hentry.hwaddress = MACAddress(mac);
it = interfaces.find(intf);
if (it != interfaces.end())
hentry.interface = it->second;
if (not hentry.interface.active)
return 0;
switch (n->nlmsg_type) {
case RTM_NEWNEIGH:
std::cout << "netlink->RTM_NEWNEIGH: ip=" << ip << ", mac=" << mac << std::endl;
FlowTable::addFlowToHw(hentry);
// TODO: Shouldn't we check for a duplicate?
FlowTable::hostTable.push_back(hentry);
break;
/* TODO: enable this? It is causing serious problems. Why?
case RTM_DELNEIGH:
std::cout << "netlink->RTM_DELNEIGH: ip=" << ip << ", mac=" << mac << std::endl;
FlowTable::delFlowFromHw(hentry);
// TODO: delete from hostTable
break;
*/
}
return 0;
}
int FlowTable::updateRouteTable(const struct sockaddr_nl *who, struct nlmsghdr *n, void *arg) {
struct rtmsg *rtmsg_ptr = (struct rtmsg *) NLMSG_DATA(n);
if (!((n->nlmsg_type == RTM_NEWROUTE || n->nlmsg_type == RTM_DELROUTE) && rtmsg_ptr->rtm_table == RT_TABLE_MAIN)) {
return 0;
}
char net[INET_ADDRSTRLEN];
char gw[INET_ADDRSTRLEN];
char intf[IF_NAMESIZE + 1];
memset(net, 0, INET_ADDRSTRLEN);
memset(gw, 0, INET_ADDRSTRLEN);
memset(intf, 0, IF_NAMESIZE + 1);
struct rtattr *rtattr_ptr;
rtattr_ptr = (struct rtattr *) RTM_RTA(rtmsg_ptr);
int rtmsg_len = RTM_PAYLOAD(n);
for (; RTA_OK(rtattr_ptr, rtmsg_len); rtattr_ptr = RTA_NEXT(rtattr_ptr, rtmsg_len)) {
switch (rtattr_ptr->rta_type) {
case RTA_DST:
inet_ntop(AF_INET, RTA_DATA(rtattr_ptr), net, 128);
break;
case RTA_GATEWAY:
inet_ntop(AF_INET, RTA_DATA(rtattr_ptr), gw, 128);
break;
case RTA_OIF:
if_indextoname(*((int *) RTA_DATA(rtattr_ptr)), (char *) intf);
break;
case RTA_MULTIPATH: {
struct rtnexthop *rtnhp_ptr = (struct rtnexthop *) RTA_DATA(
rtattr_ptr);
int rtnhp_len = RTA_PAYLOAD(rtattr_ptr);
if (rtnhp_len < (int) sizeof(*rtnhp_ptr)) {
break;
}
if (rtnhp_ptr->rtnh_len > rtnhp_len) {
break;
}
if_indextoname(rtnhp_ptr->rtnh_ifindex, (char *) intf);
int attrlen = rtnhp_len - sizeof(struct rtnexthop);
if (attrlen) {
struct rtattr *attr = RTNH_DATA(rtnhp_ptr);
for (; RTA_OK(attr, attrlen); attr = RTA_NEXT(attr, attrlen))
if ((attr->rta_type == RTA_GATEWAY)) {
inet_ntop(AF_INET, RTA_DATA(attr), gw, 128);
break;
}
}
}
break;
default:
break;
}
}
/* Skipping routes to directly attached networks (next-hop field is blank) */
{
struct in_addr gwAddr;
if (inet_aton(gw, &gwAddr) == 0)
{
return 0;
}
}
struct in_addr convmask;
convmask.s_addr = htonl(~((1 << (32 - rtmsg_ptr->rtm_dst_len)) - 1));
char mask[INET_ADDRSTRLEN];
snprintf(mask, sizeof(mask), "%s", inet_ntoa(convmask));
RouteEntry rentry;
map<string, Interface>::iterator it;
list<RouteEntry>::iterator itRoutes;
switch (n->nlmsg_type) {
case RTM_NEWROUTE:
std::cout << "netlink->RTM_NEWROUTE: net=" << net << ", mask=" << mask << ", gw=" << gw << std::endl;
// Discard if there's no gateway
if (inet_addr(gw) == INADDR_NONE) {
return 0;
}
rentry.address = IPAddress(IPV4, net);
rentry.gateway = IPAddress(IPV4, gw);
rentry.netmask = IPAddress(IPV4, mask);
it = interfaces.find(intf);
if (it != interfaces.end())
rentry.interface = it->second;
if (not rentry.interface.active) {
return 0;
}
for (itRoutes = FlowTable::routeTable.begin(); itRoutes != FlowTable::routeTable.end(); itRoutes++) {
if (rentry == (*itRoutes)) {
std::cout << "Duplicate route add request.\n" << "\n";
return 0;
}
}
FlowTable::addFlowToHw(rentry);
FlowTable::routeTable.push_back(rentry);
break;
case RTM_DELROUTE:
std::cout << "netlink->RTM_DELROUTE: net=" << net << ", mask=" << mask << ", gw=" << gw << std::endl;
rentry.address = IPAddress(IPV4, net);
rentry.gateway = IPAddress(IPV4, gw);
rentry.netmask = IPAddress(IPV4, mask);
it = interfaces.find(intf);
if (it != interfaces.end())
rentry.interface = it->second;
if (not rentry.interface.active) {
return 0;
}
for (itRoutes = FlowTable::routeTable.begin(); itRoutes != FlowTable::routeTable.end(); itRoutes++) {
if (rentry == (*itRoutes)) {
FlowTable::delFlowFromHw(rentry);
FlowTable::routeTable.remove(*itRoutes);
return 0;
}
}
break;
}
return 0;
}
void FlowTable::fakeReq(const char *hostAddr, const char *intf) {
int s;
struct arpreq req;
struct hostent *hp;
struct sockaddr_in *sin;
bzero((caddr_t) & req, sizeof(req));
sin = (struct sockaddr_in *) &req.arp_pa;
sin->sin_family = AF_INET;
sin->sin_addr.s_addr = inet_addr(hostAddr);
// Cast to eliminate warning. in_addr.s_addr is unsigned long.
if (sin->sin_addr.s_addr == (unsigned long) -1) {
if (!(hp = gethostbyname(hostAddr))) {
fprintf(stderr, "ARP: %s ", hostAddr);
herror((char *) NULL);
return;
}
bcopy((char *) hp->h_addr, (char *) &sin->sin_addr,
sizeof(sin->sin_addr));
}
if ((s = socket(AF_INET, SOCK_STREAM, 0)) < 0) {
perror("socket() failed.");
return;
}
connect(s, (struct sockaddr *) sin, sizeof(struct sockaddr));
close(s);
}
bool FlowTable::is_port_down(uint32_t port) {
vector<uint32_t>::iterator it;
for (it=down_ports->begin() ; it < down_ports->end(); it++)
if (*it == port)
return true;
return false;
}
void FlowTable::addFlowToHw(const RouteEntry& rentry) {
if (is_port_down(rentry.interface.port))
return;
list<HostEntry>::iterator iter;
MACAddress dstMac;
uint8_t tries = 0;
bool found;
// We need to resolve the gateway's IP in order to install a route flow.
// The MAC address of the next-hop is required as it is used to re-write
// the layer 2 header before forwarding the packet.
while (tries < 50 and not found) {
for (iter = FlowTable::hostTable.begin(); iter != FlowTable::hostTable.end(); iter++) {
if (iter->address == rentry.gateway) {
found = true;
dstMac = iter->hwaddress;
break;
}
}
if (not found) {
FlowTable::fakeReq(rentry.gateway.toString().c_str(), rentry.interface.name.c_str());
usleep(20000);
}
tries++;
}
if (not found)
return;
RouteInfo msg;
msg.set_is_removal(false);
msg.set_vm_id(FlowTable::vm_id);
msg.set_vm_port(rentry.interface.port);
// Action
msg.set_dst_port(rentry.interface.port);
msg.set_src_hwaddress(rentry.interface.hwaddress);
msg.set_dst_hwaddress(dstMac);
// Rule
msg.set_address(rentry.address);
msg.set_netmask(rentry.netmask);
// Send
FlowTable::ipc->send(RFCLIENT_RFSERVER_CHANNEL, RFSERVER_ID, msg);
}
void FlowTable::addFlowToHw(const HostEntry& hentry) {
if (is_port_down(hentry.interface.port))
return;
RouteInfo msg;
msg.set_is_removal(false);
msg.set_vm_id(FlowTable::vm_id);
msg.set_vm_port(hentry.interface.port);
// Action
msg.set_dst_port(hentry.interface.port);
msg.set_src_hwaddress(hentry.interface.hwaddress);
msg.set_dst_hwaddress(hentry.hwaddress);
// Rule
msg.set_address(hentry.address);
msg.set_netmask(IPAddress(IPV4, FULL_IPV4_MASK));
// Send
FlowTable::ipc->send(RFCLIENT_RFSERVER_CHANNEL, RFSERVER_ID, msg);
}
void FlowTable::delFlowFromHw(const RouteEntry& rentry) {
// We don't need to resolve the gateway's IP on route flow deletion.
// The MAC address of the next-hop is useless when deleting flows.
if (is_port_down(rentry.interface.port))
return;
RouteInfo msg;
msg.set_is_removal(true);
msg.set_vm_id(FlowTable::vm_id);
msg.set_vm_port(rentry.interface.port);
// Action
msg.set_dst_port(0);
msg.set_src_hwaddress(rentry.interface.hwaddress);
msg.set_dst_hwaddress(MACAddress(EMPTY_MAC_ADDRESS));
// Rule
msg.set_address(rentry.address);
msg.set_netmask(rentry.netmask);
// Send
FlowTable::ipc->send(RFCLIENT_RFSERVER_CHANNEL, RFSERVER_ID, msg);
}
void FlowTable::delFlowFromHw(const HostEntry& hentry) {
if (is_port_down(hentry.interface.port))
return;
RouteInfo msg;
msg.set_is_removal(true);
msg.set_vm_id(FlowTable::vm_id);
msg.set_vm_port(hentry.interface.port);
// Action
msg.set_dst_port(hentry.interface.port);
msg.set_src_hwaddress(hentry.interface.hwaddress);
msg.set_dst_hwaddress(hentry.hwaddress);
// Rule
msg.set_address(hentry.address);
msg.set_netmask(IPAddress(IPV4, FULL_IPV4_MASK));
// Send
FlowTable::ipc->send(RFCLIENT_RFSERVER_CHANNEL, RFSERVER_ID, msg);
}