RouteController.cpp revision 122f581eb16e06c70cbbc40bd40995775075151f
15c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran/* 25c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran * Copyright (C) 2014 The Android Open Source Project 35c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran * 45c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran * Licensed under the Apache License, Version 2.0 (the "License"); 55c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran * you may not use this file except in compliance with the License. 65c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran * You may obtain a copy of the License at 75c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran * 85c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran * http://www.apache.org/licenses/LICENSE-2.0 95c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran * 105c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran * Unless required by applicable law or agreed to in writing, software 115c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran * distributed under the License is distributed on an "AS IS" BASIS, 125c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 135c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran * See the License for the specific language governing permissions and 145c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran * limitations under the License. 155c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran */ 165c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran 175c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran#include "RouteController.h" 185c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran 195c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran#include "Fwmark.h" 205c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran#include "NetdConstants.h" 215c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran 228fe9c8e0a2b1c5cd2a34720efaccc641d9ab8fb6Sreeram Ramachandran#include <linux/rtnetlink.h> 235c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran#include <logwrap/logwrap.h> 245c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran#include <net/if.h> 255c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran 265c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandrannamespace { 275c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran 288fe9c8e0a2b1c5cd2a34720efaccc641d9ab8fb6Sreeram Ramachandranconst uint32_t RULE_PRIORITY_PER_NETWORK_EXPLICIT = 13000; 298fe9c8e0a2b1c5cd2a34720efaccc641d9ab8fb6Sreeram Ramachandranconst uint32_t RULE_PRIORITY_PER_NETWORK_INTERFACE = 14000; 308fe9c8e0a2b1c5cd2a34720efaccc641d9ab8fb6Sreeram Ramachandranconst uint32_t RULE_PRIORITY_PER_NETWORK_NORMAL = 17000; 318fe9c8e0a2b1c5cd2a34720efaccc641d9ab8fb6Sreeram Ramachandranconst uint32_t RULE_PRIORITY_DEFAULT_NETWORK = 19000; 328fe9c8e0a2b1c5cd2a34720efaccc641d9ab8fb6Sreeram Ramachandranconst uint32_t RULE_PRIORITY_MAIN = 20000; 338fe9c8e0a2b1c5cd2a34720efaccc641d9ab8fb6Sreeram Ramachandranconst uint32_t RULE_PRIORITY_UNREACHABLE = 21000; 345c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran 355c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandranuint32_t getRouteTableForInterface(const char* interface) { 36a48118062412f16ae712bfc8c8a539d3b6a85e47Sreeram Ramachandran uint32_t index = if_nametoindex(interface); 37a48118062412f16ae712bfc8c8a539d3b6a85e47Sreeram Ramachandran return index ? index + RouteController::ROUTE_TABLE_OFFSET_FROM_INDEX : 0; 385c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran} 395c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran 408fe9c8e0a2b1c5cd2a34720efaccc641d9ab8fb6Sreeram Ramachandran// Adds or removes a routing rule for IPv4 and IPv6. 418fe9c8e0a2b1c5cd2a34720efaccc641d9ab8fb6Sreeram Ramachandran// 428fe9c8e0a2b1c5cd2a34720efaccc641d9ab8fb6Sreeram Ramachandran// + If |table| is non-zero, the rule points at the specified routing table. Otherwise, the rule 438fe9c8e0a2b1c5cd2a34720efaccc641d9ab8fb6Sreeram Ramachandran// returns ENETUNREACH. 448fe9c8e0a2b1c5cd2a34720efaccc641d9ab8fb6Sreeram Ramachandran// + If |mask| is non-zero, the rule matches the specified fwmark and mask. Otherwise, |fwmark| is 458fe9c8e0a2b1c5cd2a34720efaccc641d9ab8fb6Sreeram Ramachandran// ignored. 468fe9c8e0a2b1c5cd2a34720efaccc641d9ab8fb6Sreeram Ramachandran// + If |interface| is non-NULL, the rule matches the specified outgoing interface. 478fe9c8e0a2b1c5cd2a34720efaccc641d9ab8fb6Sreeram Ramachandranbool runIpRuleCommand(const char* action, uint32_t priority, uint32_t table, uint32_t fwmark, 488fe9c8e0a2b1c5cd2a34720efaccc641d9ab8fb6Sreeram Ramachandran uint32_t mask, const char* interface) { 49a10ac3214f6a582b7fdb66acc43c702731e53d81Lorenzo Colitti char priorityString[UINT32_STRLEN]; 50a10ac3214f6a582b7fdb66acc43c702731e53d81Lorenzo Colitti snprintf(priorityString, sizeof(priorityString), "%u", priority); 517619e1bbebdfe643c35ee6be4ac054f5255f0706Sreeram Ramachandran 527619e1bbebdfe643c35ee6be4ac054f5255f0706Sreeram Ramachandran char tableString[UINT32_STRLEN]; 53a10ac3214f6a582b7fdb66acc43c702731e53d81Lorenzo Colitti snprintf(tableString, sizeof(tableString), "%u", table); 54a10ac3214f6a582b7fdb66acc43c702731e53d81Lorenzo Colitti 55a10ac3214f6a582b7fdb66acc43c702731e53d81Lorenzo Colitti char fwmarkString[sizeof("0x12345678/0x12345678")]; 56a10ac3214f6a582b7fdb66acc43c702731e53d81Lorenzo Colitti snprintf(fwmarkString, sizeof(fwmarkString), "0x%x/0x%x", fwmark, mask); 57a10ac3214f6a582b7fdb66acc43c702731e53d81Lorenzo Colitti 585c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran const char* version[] = {"-4", "-6"}; 595c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran for (size_t i = 0; i < ARRAY_SIZE(version); ++i) { 605c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran int argc = 0; 615c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran const char* argv[16]; 625c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran 635c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran argv[argc++] = IP_PATH; 645c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran argv[argc++] = version[i]; 655c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran argv[argc++] = "rule"; 665c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran argv[argc++] = action; 675c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran argv[argc++] = "priority"; 68a10ac3214f6a582b7fdb66acc43c702731e53d81Lorenzo Colitti argv[argc++] = priorityString; 698fe9c8e0a2b1c5cd2a34720efaccc641d9ab8fb6Sreeram Ramachandran if (table) { 708fe9c8e0a2b1c5cd2a34720efaccc641d9ab8fb6Sreeram Ramachandran argv[argc++] = "table"; 718fe9c8e0a2b1c5cd2a34720efaccc641d9ab8fb6Sreeram Ramachandran argv[argc++] = tableString; 728fe9c8e0a2b1c5cd2a34720efaccc641d9ab8fb6Sreeram Ramachandran } else { 738fe9c8e0a2b1c5cd2a34720efaccc641d9ab8fb6Sreeram Ramachandran argv[argc++] = "unreachable"; 748fe9c8e0a2b1c5cd2a34720efaccc641d9ab8fb6Sreeram Ramachandran } 75a10ac3214f6a582b7fdb66acc43c702731e53d81Lorenzo Colitti if (mask) { 765c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran argv[argc++] = "fwmark"; 77a10ac3214f6a582b7fdb66acc43c702731e53d81Lorenzo Colitti argv[argc++] = fwmarkString; 785c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran } 799c0d313de6a3157fadd3b52a9927c77216ca435eSreeram Ramachandran if (interface) { 805c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran argv[argc++] = "oif"; 819c0d313de6a3157fadd3b52a9927c77216ca435eSreeram Ramachandran argv[argc++] = interface; 825c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran } 835c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran if (android_fork_execvp(argc, const_cast<char**>(argv), NULL, false, false)) { 845c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran return false; 855c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran } 865c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran } 875c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran 885c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran return true; 895c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran} 905c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran 917619e1bbebdfe643c35ee6be4ac054f5255f0706Sreeram Ramachandranbool runIpRouteCommand(const char* action, uint32_t table, const char* interface, 927619e1bbebdfe643c35ee6be4ac054f5255f0706Sreeram Ramachandran const char* destination, const char* nexthop) { 937619e1bbebdfe643c35ee6be4ac054f5255f0706Sreeram Ramachandran char tableString[UINT32_STRLEN]; 947619e1bbebdfe643c35ee6be4ac054f5255f0706Sreeram Ramachandran snprintf(tableString, sizeof(tableString), "%u", table); 957619e1bbebdfe643c35ee6be4ac054f5255f0706Sreeram Ramachandran 967619e1bbebdfe643c35ee6be4ac054f5255f0706Sreeram Ramachandran int argc = 0; 977619e1bbebdfe643c35ee6be4ac054f5255f0706Sreeram Ramachandran const char* argv[16]; 987619e1bbebdfe643c35ee6be4ac054f5255f0706Sreeram Ramachandran 997619e1bbebdfe643c35ee6be4ac054f5255f0706Sreeram Ramachandran argv[argc++] = IP_PATH; 1007619e1bbebdfe643c35ee6be4ac054f5255f0706Sreeram Ramachandran argv[argc++] = "route"; 1017619e1bbebdfe643c35ee6be4ac054f5255f0706Sreeram Ramachandran argv[argc++] = action; 1027619e1bbebdfe643c35ee6be4ac054f5255f0706Sreeram Ramachandran argv[argc++] = "table"; 1037619e1bbebdfe643c35ee6be4ac054f5255f0706Sreeram Ramachandran argv[argc++] = tableString; 1047619e1bbebdfe643c35ee6be4ac054f5255f0706Sreeram Ramachandran if (destination) { 1057619e1bbebdfe643c35ee6be4ac054f5255f0706Sreeram Ramachandran argv[argc++] = destination; 1067619e1bbebdfe643c35ee6be4ac054f5255f0706Sreeram Ramachandran argv[argc++] = "dev"; 1077619e1bbebdfe643c35ee6be4ac054f5255f0706Sreeram Ramachandran argv[argc++] = interface; 1087619e1bbebdfe643c35ee6be4ac054f5255f0706Sreeram Ramachandran if (nexthop) { 1097619e1bbebdfe643c35ee6be4ac054f5255f0706Sreeram Ramachandran argv[argc++] = "via"; 1107619e1bbebdfe643c35ee6be4ac054f5255f0706Sreeram Ramachandran argv[argc++] = nexthop; 1117619e1bbebdfe643c35ee6be4ac054f5255f0706Sreeram Ramachandran } 1127619e1bbebdfe643c35ee6be4ac054f5255f0706Sreeram Ramachandran } 1137619e1bbebdfe643c35ee6be4ac054f5255f0706Sreeram Ramachandran 114a79f6182a338621a32f350d7c2985c6872cccf84Sreeram Ramachandran return !android_fork_execvp(argc, const_cast<char**>(argv), NULL, false, false); 1157619e1bbebdfe643c35ee6be4ac054f5255f0706Sreeram Ramachandran} 1167619e1bbebdfe643c35ee6be4ac054f5255f0706Sreeram Ramachandran 1179c0d313de6a3157fadd3b52a9927c77216ca435eSreeram Ramachandranbool modifyPerNetworkRules(unsigned netId, const char* interface, Permission permission, bool add, 1189c0d313de6a3157fadd3b52a9927c77216ca435eSreeram Ramachandran bool modifyIptables) { 1195c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran uint32_t table = getRouteTableForInterface(interface); 1205c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran if (!table) { 1215c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran return false; 1225c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran } 1235c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran 1245c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran const char* action = add ? ADD : DEL; 1255c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran 126122f581eb16e06c70cbbc40bd40995775075151fSreeram Ramachandran Fwmark fwmark; 127122f581eb16e06c70cbbc40bd40995775075151fSreeram Ramachandran fwmark.permission = permission; 128122f581eb16e06c70cbbc40bd40995775075151fSreeram Ramachandran 129122f581eb16e06c70cbbc40bd40995775075151fSreeram Ramachandran Fwmark mask; 130122f581eb16e06c70cbbc40bd40995775075151fSreeram Ramachandran mask.permission = permission; 1315c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran 1325c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran // A rule to route traffic based on a chosen outgoing interface. 1335c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran // 1345c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran // Supports apps that use SO_BINDTODEVICE or IP_PKTINFO options and the kernel that already 1355c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran // knows the outgoing interface (typically for link-local communications). 136122f581eb16e06c70cbbc40bd40995775075151fSreeram Ramachandran if (!runIpRuleCommand(action, RULE_PRIORITY_PER_NETWORK_INTERFACE, table, fwmark.intValue, 137122f581eb16e06c70cbbc40bd40995775075151fSreeram Ramachandran mask.intValue, interface)) { 1385c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran return false; 1395c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran } 1405c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran 1415c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran // A rule to route traffic based on the chosen network. 1425c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran // 1435c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran // This is for sockets that have not explicitly requested a particular network, but have been 1445c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran // bound to one when they called connect(). This ensures that sockets connected on a particular 1455c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran // network stay on that network even if the default network changes. 146122f581eb16e06c70cbbc40bd40995775075151fSreeram Ramachandran fwmark.netId = netId; 147122f581eb16e06c70cbbc40bd40995775075151fSreeram Ramachandran mask.netId = FWMARK_NET_ID_MASK; 148122f581eb16e06c70cbbc40bd40995775075151fSreeram Ramachandran if (!runIpRuleCommand(action, RULE_PRIORITY_PER_NETWORK_NORMAL, table, fwmark.intValue, 149122f581eb16e06c70cbbc40bd40995775075151fSreeram Ramachandran mask.intValue, NULL)) { 150122f581eb16e06c70cbbc40bd40995775075151fSreeram Ramachandran return false; 151122f581eb16e06c70cbbc40bd40995775075151fSreeram Ramachandran } 152122f581eb16e06c70cbbc40bd40995775075151fSreeram Ramachandran 153122f581eb16e06c70cbbc40bd40995775075151fSreeram Ramachandran // A rule to route traffic based on an explicitly chosen network. 154122f581eb16e06c70cbbc40bd40995775075151fSreeram Ramachandran // 155122f581eb16e06c70cbbc40bd40995775075151fSreeram Ramachandran // Supports apps that use the multinetwork APIs to restrict their traffic to a network. 156122f581eb16e06c70cbbc40bd40995775075151fSreeram Ramachandran // 157122f581eb16e06c70cbbc40bd40995775075151fSreeram Ramachandran // We don't really need to check the permission bits of the fwmark here, as they would've been 158122f581eb16e06c70cbbc40bd40995775075151fSreeram Ramachandran // checked at the time the netId was set into the fwmark, but we do so to be consistent. 159122f581eb16e06c70cbbc40bd40995775075151fSreeram Ramachandran fwmark.explicitlySelected = true; 160122f581eb16e06c70cbbc40bd40995775075151fSreeram Ramachandran mask.explicitlySelected = true; 161122f581eb16e06c70cbbc40bd40995775075151fSreeram Ramachandran if (!runIpRuleCommand(action, RULE_PRIORITY_PER_NETWORK_EXPLICIT, table, fwmark.intValue, 162122f581eb16e06c70cbbc40bd40995775075151fSreeram Ramachandran mask.intValue, NULL)) { 1635c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran return false; 1645c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran } 1655c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran 1665c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran // An iptables rule to mark incoming packets on a network with the netId of the network. 1675c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran // 1685c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran // This is so that the kernel can: 1695c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran // + Use the right fwmark for (and thus correctly route) replies (e.g.: TCP RST, ICMP errors, 170a48118062412f16ae712bfc8c8a539d3b6a85e47Sreeram Ramachandran // ping replies). 1715c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran // + Mark sockets that accept connections from this interface so that the connection stays on 1725c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran // the same interface. 173379bd33f7640e2c4bef902be0ed6cb96378c8c2eSreeram Ramachandran if (modifyIptables) { 174379bd33f7640e2c4bef902be0ed6cb96378c8c2eSreeram Ramachandran action = add ? "-A" : "-D"; 175379bd33f7640e2c4bef902be0ed6cb96378c8c2eSreeram Ramachandran char markString[UINT32_HEX_STRLEN]; 176379bd33f7640e2c4bef902be0ed6cb96378c8c2eSreeram Ramachandran snprintf(markString, sizeof(markString), "0x%x", netId); 177379bd33f7640e2c4bef902be0ed6cb96378c8c2eSreeram Ramachandran if (execIptables(V4V6, "-t", "mangle", action, "INPUT", "-i", interface, "-j", "MARK", 178379bd33f7640e2c4bef902be0ed6cb96378c8c2eSreeram Ramachandran "--set-mark", markString, NULL)) { 179379bd33f7640e2c4bef902be0ed6cb96378c8c2eSreeram Ramachandran return false; 180379bd33f7640e2c4bef902be0ed6cb96378c8c2eSreeram Ramachandran } 1815c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran } 1825c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran 1835c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran return true; 1845c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran} 1855c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran 1869c0d313de6a3157fadd3b52a9927c77216ca435eSreeram Ramachandranbool modifyDefaultNetworkRules(const char* interface, Permission permission, const char* action) { 1879c0d313de6a3157fadd3b52a9927c77216ca435eSreeram Ramachandran uint32_t table = getRouteTableForInterface(interface); 1889c0d313de6a3157fadd3b52a9927c77216ca435eSreeram Ramachandran if (!table) { 1899c0d313de6a3157fadd3b52a9927c77216ca435eSreeram Ramachandran return false; 1909c0d313de6a3157fadd3b52a9927c77216ca435eSreeram Ramachandran } 1919c0d313de6a3157fadd3b52a9927c77216ca435eSreeram Ramachandran 192122f581eb16e06c70cbbc40bd40995775075151fSreeram Ramachandran Fwmark fwmark; 193122f581eb16e06c70cbbc40bd40995775075151fSreeram Ramachandran fwmark.netId = 0; 194122f581eb16e06c70cbbc40bd40995775075151fSreeram Ramachandran fwmark.permission = permission; 195122f581eb16e06c70cbbc40bd40995775075151fSreeram Ramachandran 196122f581eb16e06c70cbbc40bd40995775075151fSreeram Ramachandran Fwmark mask; 197122f581eb16e06c70cbbc40bd40995775075151fSreeram Ramachandran mask.netId = FWMARK_NET_ID_MASK; 198122f581eb16e06c70cbbc40bd40995775075151fSreeram Ramachandran mask.permission = permission; 1999c0d313de6a3157fadd3b52a9927c77216ca435eSreeram Ramachandran 200122f581eb16e06c70cbbc40bd40995775075151fSreeram Ramachandran return runIpRuleCommand(action, RULE_PRIORITY_DEFAULT_NETWORK, table, fwmark.intValue, 201122f581eb16e06c70cbbc40bd40995775075151fSreeram Ramachandran mask.intValue, NULL); 2027619e1bbebdfe643c35ee6be4ac054f5255f0706Sreeram Ramachandran} 2037619e1bbebdfe643c35ee6be4ac054f5255f0706Sreeram Ramachandran 204c92133732378aae815120c39edd62a7b4eb773b3Sreeram Ramachandranbool modifyRoute(const char* interface, const char* destination, const char* nexthop, 205c92133732378aae815120c39edd62a7b4eb773b3Sreeram Ramachandran const char* action) { 2067619e1bbebdfe643c35ee6be4ac054f5255f0706Sreeram Ramachandran uint32_t table = getRouteTableForInterface(interface); 2077619e1bbebdfe643c35ee6be4ac054f5255f0706Sreeram Ramachandran if (!table) { 2089c0d313de6a3157fadd3b52a9927c77216ca435eSreeram Ramachandran return false; 2099c0d313de6a3157fadd3b52a9927c77216ca435eSreeram Ramachandran } 2109c0d313de6a3157fadd3b52a9927c77216ca435eSreeram Ramachandran 211c92133732378aae815120c39edd62a7b4eb773b3Sreeram Ramachandran if (!runIpRouteCommand(action, table, interface, destination, nexthop)) { 212c92133732378aae815120c39edd62a7b4eb773b3Sreeram Ramachandran return false; 213c92133732378aae815120c39edd62a7b4eb773b3Sreeram Ramachandran } 214c92133732378aae815120c39edd62a7b4eb773b3Sreeram Ramachandran 215c92133732378aae815120c39edd62a7b4eb773b3Sreeram Ramachandran // If there's no nexthop, this is a directly connected route. Add it to the main table also, to 216c92133732378aae815120c39edd62a7b4eb773b3Sreeram Ramachandran // let the kernel find it when validating nexthops when global routes are added. Don't do this 217c92133732378aae815120c39edd62a7b4eb773b3Sreeram Ramachandran // for IPv6, since all directly-connected routes in v6 are link-local and should already be in 218c92133732378aae815120c39edd62a7b4eb773b3Sreeram Ramachandran // the main table. 219fd6424fdf2cd0516a6c95288610e323dbdfe84ffSreeram Ramachandran // TODO: A failure here typically means that the route already exists in the main table, so we 220fd6424fdf2cd0516a6c95288610e323dbdfe84ffSreeram Ramachandran // ignore it. It's wrong to ignore other kinds of failures, but we have no way to distinguish 221fd6424fdf2cd0516a6c95288610e323dbdfe84ffSreeram Ramachandran // them based on the return status of the 'ip' command. Fix this situation by ignoring errors 222fd6424fdf2cd0516a6c95288610e323dbdfe84ffSreeram Ramachandran // only when action == ADD && error == EEXIST. 223fd6424fdf2cd0516a6c95288610e323dbdfe84ffSreeram Ramachandran if (!nexthop && !strchr(destination, ':')) { 224fd6424fdf2cd0516a6c95288610e323dbdfe84ffSreeram Ramachandran runIpRouteCommand(action, RT_TABLE_MAIN, interface, destination, NULL); 225c92133732378aae815120c39edd62a7b4eb773b3Sreeram Ramachandran } 226c92133732378aae815120c39edd62a7b4eb773b3Sreeram Ramachandran 227c92133732378aae815120c39edd62a7b4eb773b3Sreeram Ramachandran return true; 2289c0d313de6a3157fadd3b52a9927c77216ca435eSreeram Ramachandran} 2299c0d313de6a3157fadd3b52a9927c77216ca435eSreeram Ramachandran 23092b66c4990b4a0ab608aa9c31da946f36085203bSreeram Ramachandranbool flushRoutes(const char* interface) { 23192b66c4990b4a0ab608aa9c31da946f36085203bSreeram Ramachandran uint32_t table = getRouteTableForInterface(interface); 23292b66c4990b4a0ab608aa9c31da946f36085203bSreeram Ramachandran if (!table) { 23392b66c4990b4a0ab608aa9c31da946f36085203bSreeram Ramachandran return false; 23492b66c4990b4a0ab608aa9c31da946f36085203bSreeram Ramachandran } 23592b66c4990b4a0ab608aa9c31da946f36085203bSreeram Ramachandran 23692b66c4990b4a0ab608aa9c31da946f36085203bSreeram Ramachandran return runIpRouteCommand("flush", table, NULL, NULL, NULL); 23792b66c4990b4a0ab608aa9c31da946f36085203bSreeram Ramachandran} 23892b66c4990b4a0ab608aa9c31da946f36085203bSreeram Ramachandran 2395c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran} // namespace 2405c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran 2418fe9c8e0a2b1c5cd2a34720efaccc641d9ab8fb6Sreeram Ramachandranvoid RouteController::Init() { 2428fe9c8e0a2b1c5cd2a34720efaccc641d9ab8fb6Sreeram Ramachandran // Add a new rule to look up the 'main' table, with the same selectors as the "default network" 2438fe9c8e0a2b1c5cd2a34720efaccc641d9ab8fb6Sreeram Ramachandran // rule, but with a lower priority. Since the default network rule points to a table with a 2448fe9c8e0a2b1c5cd2a34720efaccc641d9ab8fb6Sreeram Ramachandran // default route, the rule we're adding will never be used for normal routing lookups. However, 2458fe9c8e0a2b1c5cd2a34720efaccc641d9ab8fb6Sreeram Ramachandran // the kernel may fall-through to it to find directly-connected routes when it validates that a 2468fe9c8e0a2b1c5cd2a34720efaccc641d9ab8fb6Sreeram Ramachandran // nexthop (in a route being added) is reachable. 247122f581eb16e06c70cbbc40bd40995775075151fSreeram Ramachandran Fwmark fwmark; 248122f581eb16e06c70cbbc40bd40995775075151fSreeram Ramachandran fwmark.netId = 0; 249122f581eb16e06c70cbbc40bd40995775075151fSreeram Ramachandran 250122f581eb16e06c70cbbc40bd40995775075151fSreeram Ramachandran Fwmark mask; 251122f581eb16e06c70cbbc40bd40995775075151fSreeram Ramachandran mask.netId = FWMARK_NET_ID_MASK; 252122f581eb16e06c70cbbc40bd40995775075151fSreeram Ramachandran 253122f581eb16e06c70cbbc40bd40995775075151fSreeram Ramachandran runIpRuleCommand(ADD, RULE_PRIORITY_MAIN, RT_TABLE_MAIN, fwmark.intValue, mask.intValue, NULL); 2548fe9c8e0a2b1c5cd2a34720efaccc641d9ab8fb6Sreeram Ramachandran 2558fe9c8e0a2b1c5cd2a34720efaccc641d9ab8fb6Sreeram Ramachandran// TODO: Uncomment once we are sure everything works. 2568fe9c8e0a2b1c5cd2a34720efaccc641d9ab8fb6Sreeram Ramachandran#if 0 2578fe9c8e0a2b1c5cd2a34720efaccc641d9ab8fb6Sreeram Ramachandran // Add a rule to preempt the pre-defined "from all lookup main" rule. This ensures that packets 2588fe9c8e0a2b1c5cd2a34720efaccc641d9ab8fb6Sreeram Ramachandran // that are already marked with a specific NetId don't fall-through to the main table. 2598fe9c8e0a2b1c5cd2a34720efaccc641d9ab8fb6Sreeram Ramachandran runIpRuleCommand(ADD, RULE_PRIORITY_UNREACHABLE, 0, 0, 0, NULL); 2608fe9c8e0a2b1c5cd2a34720efaccc641d9ab8fb6Sreeram Ramachandran#endif 2618fe9c8e0a2b1c5cd2a34720efaccc641d9ab8fb6Sreeram Ramachandran} 2628fe9c8e0a2b1c5cd2a34720efaccc641d9ab8fb6Sreeram Ramachandran 263ae37e8a4f42b658d5aaf43f312f063944b4aeecbPaul Jensenbool RouteController::addInterfaceToNetwork(unsigned netId, const char* interface, 264ae37e8a4f42b658d5aaf43f312f063944b4aeecbPaul Jensen Permission permission) { 2659c0d313de6a3157fadd3b52a9927c77216ca435eSreeram Ramachandran return modifyPerNetworkRules(netId, interface, permission, true, true); 2665c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran} 2675c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran 268ae37e8a4f42b658d5aaf43f312f063944b4aeecbPaul Jensenbool RouteController::removeInterfaceFromNetwork(unsigned netId, const char* interface, 269ae37e8a4f42b658d5aaf43f312f063944b4aeecbPaul Jensen Permission permission) { 27092b66c4990b4a0ab608aa9c31da946f36085203bSreeram Ramachandran return modifyPerNetworkRules(netId, interface, permission, false, true) && 27192b66c4990b4a0ab608aa9c31da946f36085203bSreeram Ramachandran flushRoutes(interface); 272379bd33f7640e2c4bef902be0ed6cb96378c8c2eSreeram Ramachandran} 273379bd33f7640e2c4bef902be0ed6cb96378c8c2eSreeram Ramachandran 274379bd33f7640e2c4bef902be0ed6cb96378c8c2eSreeram Ramachandranbool RouteController::modifyNetworkPermission(unsigned netId, const char* interface, 275379bd33f7640e2c4bef902be0ed6cb96378c8c2eSreeram Ramachandran Permission oldPermission, Permission newPermission) { 276379bd33f7640e2c4bef902be0ed6cb96378c8c2eSreeram Ramachandran // Add the new rules before deleting the old ones, to avoid race conditions. 2779c0d313de6a3157fadd3b52a9927c77216ca435eSreeram Ramachandran return modifyPerNetworkRules(netId, interface, newPermission, true, false) && 2789c0d313de6a3157fadd3b52a9927c77216ca435eSreeram Ramachandran modifyPerNetworkRules(netId, interface, oldPermission, false, false); 2799c0d313de6a3157fadd3b52a9927c77216ca435eSreeram Ramachandran} 2809c0d313de6a3157fadd3b52a9927c77216ca435eSreeram Ramachandran 2819c0d313de6a3157fadd3b52a9927c77216ca435eSreeram Ramachandranbool RouteController::addDefaultNetwork(const char* interface, Permission permission) { 2829c0d313de6a3157fadd3b52a9927c77216ca435eSreeram Ramachandran return modifyDefaultNetworkRules(interface, permission, ADD); 2839c0d313de6a3157fadd3b52a9927c77216ca435eSreeram Ramachandran} 2849c0d313de6a3157fadd3b52a9927c77216ca435eSreeram Ramachandran 2859c0d313de6a3157fadd3b52a9927c77216ca435eSreeram Ramachandranbool RouteController::removeDefaultNetwork(const char* interface, Permission permission) { 2869c0d313de6a3157fadd3b52a9927c77216ca435eSreeram Ramachandran return modifyDefaultNetworkRules(interface, permission, DEL); 2875c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran} 2887619e1bbebdfe643c35ee6be4ac054f5255f0706Sreeram Ramachandran 2897619e1bbebdfe643c35ee6be4ac054f5255f0706Sreeram Ramachandranbool RouteController::addRoute(const char* interface, const char* destination, 2907619e1bbebdfe643c35ee6be4ac054f5255f0706Sreeram Ramachandran const char* nexthop) { 291c92133732378aae815120c39edd62a7b4eb773b3Sreeram Ramachandran return modifyRoute(interface, destination, nexthop, ADD); 2927619e1bbebdfe643c35ee6be4ac054f5255f0706Sreeram Ramachandran} 2937619e1bbebdfe643c35ee6be4ac054f5255f0706Sreeram Ramachandran 2947619e1bbebdfe643c35ee6be4ac054f5255f0706Sreeram Ramachandranbool RouteController::removeRoute(const char* interface, const char* destination, 2957619e1bbebdfe643c35ee6be4ac054f5255f0706Sreeram Ramachandran const char* nexthop) { 296c92133732378aae815120c39edd62a7b4eb773b3Sreeram Ramachandran return modifyRoute(interface, destination, nexthop, DEL); 2977619e1bbebdfe643c35ee6be4ac054f5255f0706Sreeram Ramachandran} 298