RouteController.cpp revision c92133732378aae815120c39edd62a7b4eb773b3
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 359c0d313de6a3157fadd3b52a9927c77216ca435eSreeram Ramachandranconst bool FWMARK_USE_NET_ID = true; 365c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandranconst bool FWMARK_USE_EXPLICIT = true; 379c0d313de6a3157fadd3b52a9927c77216ca435eSreeram Ramachandranconst bool FWMARK_USE_PROTECT = true; 385c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran 395c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandranuint32_t getRouteTableForInterface(const char* interface) { 40a48118062412f16ae712bfc8c8a539d3b6a85e47Sreeram Ramachandran uint32_t index = if_nametoindex(interface); 41a48118062412f16ae712bfc8c8a539d3b6a85e47Sreeram Ramachandran return index ? index + RouteController::ROUTE_TABLE_OFFSET_FROM_INDEX : 0; 425c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran} 435c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran 448fe9c8e0a2b1c5cd2a34720efaccc641d9ab8fb6Sreeram Ramachandran// Adds or removes a routing rule for IPv4 and IPv6. 458fe9c8e0a2b1c5cd2a34720efaccc641d9ab8fb6Sreeram Ramachandran// 468fe9c8e0a2b1c5cd2a34720efaccc641d9ab8fb6Sreeram Ramachandran// + If |table| is non-zero, the rule points at the specified routing table. Otherwise, the rule 478fe9c8e0a2b1c5cd2a34720efaccc641d9ab8fb6Sreeram Ramachandran// returns ENETUNREACH. 488fe9c8e0a2b1c5cd2a34720efaccc641d9ab8fb6Sreeram Ramachandran// + If |mask| is non-zero, the rule matches the specified fwmark and mask. Otherwise, |fwmark| is 498fe9c8e0a2b1c5cd2a34720efaccc641d9ab8fb6Sreeram Ramachandran// ignored. 508fe9c8e0a2b1c5cd2a34720efaccc641d9ab8fb6Sreeram Ramachandran// + If |interface| is non-NULL, the rule matches the specified outgoing interface. 518fe9c8e0a2b1c5cd2a34720efaccc641d9ab8fb6Sreeram Ramachandranbool runIpRuleCommand(const char* action, uint32_t priority, uint32_t table, uint32_t fwmark, 528fe9c8e0a2b1c5cd2a34720efaccc641d9ab8fb6Sreeram Ramachandran uint32_t mask, const char* interface) { 53a10ac3214f6a582b7fdb66acc43c702731e53d81Lorenzo Colitti char priorityString[UINT32_STRLEN]; 54a10ac3214f6a582b7fdb66acc43c702731e53d81Lorenzo Colitti snprintf(priorityString, sizeof(priorityString), "%u", priority); 557619e1bbebdfe643c35ee6be4ac054f5255f0706Sreeram Ramachandran 567619e1bbebdfe643c35ee6be4ac054f5255f0706Sreeram Ramachandran char tableString[UINT32_STRLEN]; 57a10ac3214f6a582b7fdb66acc43c702731e53d81Lorenzo Colitti snprintf(tableString, sizeof(tableString), "%u", table); 58a10ac3214f6a582b7fdb66acc43c702731e53d81Lorenzo Colitti 59a10ac3214f6a582b7fdb66acc43c702731e53d81Lorenzo Colitti char fwmarkString[sizeof("0x12345678/0x12345678")]; 60a10ac3214f6a582b7fdb66acc43c702731e53d81Lorenzo Colitti snprintf(fwmarkString, sizeof(fwmarkString), "0x%x/0x%x", fwmark, mask); 61a10ac3214f6a582b7fdb66acc43c702731e53d81Lorenzo Colitti 625c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran const char* version[] = {"-4", "-6"}; 635c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran for (size_t i = 0; i < ARRAY_SIZE(version); ++i) { 645c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran int argc = 0; 655c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran const char* argv[16]; 665c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran 675c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran argv[argc++] = IP_PATH; 685c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran argv[argc++] = version[i]; 695c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran argv[argc++] = "rule"; 705c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran argv[argc++] = action; 715c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran argv[argc++] = "priority"; 72a10ac3214f6a582b7fdb66acc43c702731e53d81Lorenzo Colitti argv[argc++] = priorityString; 738fe9c8e0a2b1c5cd2a34720efaccc641d9ab8fb6Sreeram Ramachandran if (table) { 748fe9c8e0a2b1c5cd2a34720efaccc641d9ab8fb6Sreeram Ramachandran argv[argc++] = "table"; 758fe9c8e0a2b1c5cd2a34720efaccc641d9ab8fb6Sreeram Ramachandran argv[argc++] = tableString; 768fe9c8e0a2b1c5cd2a34720efaccc641d9ab8fb6Sreeram Ramachandran } else { 778fe9c8e0a2b1c5cd2a34720efaccc641d9ab8fb6Sreeram Ramachandran argv[argc++] = "unreachable"; 788fe9c8e0a2b1c5cd2a34720efaccc641d9ab8fb6Sreeram Ramachandran } 79a10ac3214f6a582b7fdb66acc43c702731e53d81Lorenzo Colitti if (mask) { 805c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran argv[argc++] = "fwmark"; 81a10ac3214f6a582b7fdb66acc43c702731e53d81Lorenzo Colitti argv[argc++] = fwmarkString; 825c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran } 839c0d313de6a3157fadd3b52a9927c77216ca435eSreeram Ramachandran if (interface) { 845c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran argv[argc++] = "oif"; 859c0d313de6a3157fadd3b52a9927c77216ca435eSreeram Ramachandran argv[argc++] = interface; 865c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran } 875c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran if (android_fork_execvp(argc, const_cast<char**>(argv), NULL, false, false)) { 885c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran return false; 895c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran } 905c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran } 915c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran 925c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran return true; 935c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran} 945c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran 957619e1bbebdfe643c35ee6be4ac054f5255f0706Sreeram Ramachandranbool runIpRouteCommand(const char* action, uint32_t table, const char* interface, 967619e1bbebdfe643c35ee6be4ac054f5255f0706Sreeram Ramachandran const char* destination, const char* nexthop) { 977619e1bbebdfe643c35ee6be4ac054f5255f0706Sreeram Ramachandran char tableString[UINT32_STRLEN]; 987619e1bbebdfe643c35ee6be4ac054f5255f0706Sreeram Ramachandran snprintf(tableString, sizeof(tableString), "%u", table); 997619e1bbebdfe643c35ee6be4ac054f5255f0706Sreeram Ramachandran 1007619e1bbebdfe643c35ee6be4ac054f5255f0706Sreeram Ramachandran int argc = 0; 1017619e1bbebdfe643c35ee6be4ac054f5255f0706Sreeram Ramachandran const char* argv[16]; 1027619e1bbebdfe643c35ee6be4ac054f5255f0706Sreeram Ramachandran 1037619e1bbebdfe643c35ee6be4ac054f5255f0706Sreeram Ramachandran argv[argc++] = IP_PATH; 1047619e1bbebdfe643c35ee6be4ac054f5255f0706Sreeram Ramachandran argv[argc++] = "route"; 1057619e1bbebdfe643c35ee6be4ac054f5255f0706Sreeram Ramachandran argv[argc++] = action; 1067619e1bbebdfe643c35ee6be4ac054f5255f0706Sreeram Ramachandran argv[argc++] = "table"; 1077619e1bbebdfe643c35ee6be4ac054f5255f0706Sreeram Ramachandran argv[argc++] = tableString; 1087619e1bbebdfe643c35ee6be4ac054f5255f0706Sreeram Ramachandran if (destination) { 1097619e1bbebdfe643c35ee6be4ac054f5255f0706Sreeram Ramachandran argv[argc++] = destination; 1107619e1bbebdfe643c35ee6be4ac054f5255f0706Sreeram Ramachandran argv[argc++] = "dev"; 1117619e1bbebdfe643c35ee6be4ac054f5255f0706Sreeram Ramachandran argv[argc++] = interface; 1127619e1bbebdfe643c35ee6be4ac054f5255f0706Sreeram Ramachandran if (nexthop) { 1137619e1bbebdfe643c35ee6be4ac054f5255f0706Sreeram Ramachandran argv[argc++] = "via"; 1147619e1bbebdfe643c35ee6be4ac054f5255f0706Sreeram Ramachandran argv[argc++] = nexthop; 1157619e1bbebdfe643c35ee6be4ac054f5255f0706Sreeram Ramachandran } 1167619e1bbebdfe643c35ee6be4ac054f5255f0706Sreeram Ramachandran } 1177619e1bbebdfe643c35ee6be4ac054f5255f0706Sreeram Ramachandran 1187619e1bbebdfe643c35ee6be4ac054f5255f0706Sreeram Ramachandran return android_fork_execvp(argc, const_cast<char**>(argv), NULL, false, false); 1197619e1bbebdfe643c35ee6be4ac054f5255f0706Sreeram Ramachandran} 1207619e1bbebdfe643c35ee6be4ac054f5255f0706Sreeram Ramachandran 1219c0d313de6a3157fadd3b52a9927c77216ca435eSreeram Ramachandranbool modifyPerNetworkRules(unsigned netId, const char* interface, Permission permission, bool add, 1229c0d313de6a3157fadd3b52a9927c77216ca435eSreeram Ramachandran bool modifyIptables) { 1235c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran uint32_t table = getRouteTableForInterface(interface); 1245c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran if (!table) { 1255c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran return false; 1265c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran } 1275c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran 1285c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran const char* action = add ? ADD : DEL; 1295c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran 1305c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran // A rule to route traffic based on an explicitly chosen network. 1315c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran // 1325c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran // Supports apps that use the multinetwork APIs to restrict their traffic to a network. 1335c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran // 1345c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran // We don't really need to check the permission bits of the fwmark here, as they would've been 1355c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran // checked at the time the netId was set into the fwmark, but we do so to be consistent. 1365c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran uint32_t fwmark = getFwmark(netId, FWMARK_USE_EXPLICIT, !FWMARK_USE_PROTECT, permission); 1375c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran uint32_t mask = getFwmarkMask(FWMARK_USE_NET_ID, FWMARK_USE_EXPLICIT, !FWMARK_USE_PROTECT, 1385c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran permission); 139a10ac3214f6a582b7fdb66acc43c702731e53d81Lorenzo Colitti if (!runIpRuleCommand(action, RULE_PRIORITY_PER_NETWORK_EXPLICIT, table, fwmark, mask, NULL)) { 1405c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran return false; 1415c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran } 1425c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran 1435c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran // A rule to route traffic based on a chosen outgoing interface. 1445c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran // 1455c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran // Supports apps that use SO_BINDTODEVICE or IP_PKTINFO options and the kernel that already 1465c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran // knows the outgoing interface (typically for link-local communications). 1475c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran fwmark = getFwmark(0, !FWMARK_USE_EXPLICIT, !FWMARK_USE_PROTECT, permission); 1485c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran mask = getFwmark(!FWMARK_USE_NET_ID, !FWMARK_USE_EXPLICIT, !FWMARK_USE_PROTECT, permission); 1499c0d313de6a3157fadd3b52a9927c77216ca435eSreeram Ramachandran if (!runIpRuleCommand(action, RULE_PRIORITY_PER_NETWORK_INTERFACE, table, fwmark, mask, 1509c0d313de6a3157fadd3b52a9927c77216ca435eSreeram Ramachandran interface)) { 1515c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran return false; 1525c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran } 1535c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran 1545c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran // A rule to route traffic based on the chosen network. 1555c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran // 1565c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran // This is for sockets that have not explicitly requested a particular network, but have been 1575c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran // bound to one when they called connect(). This ensures that sockets connected on a particular 1585c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran // network stay on that network even if the default network changes. 1595c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran fwmark = getFwmark(netId, !FWMARK_USE_EXPLICIT, !FWMARK_USE_PROTECT, permission); 1605c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran mask = getFwmarkMask(FWMARK_USE_NET_ID, !FWMARK_USE_EXPLICIT, !FWMARK_USE_PROTECT, permission); 161a10ac3214f6a582b7fdb66acc43c702731e53d81Lorenzo Colitti if (!runIpRuleCommand(action, RULE_PRIORITY_PER_NETWORK_NORMAL, table, fwmark, mask, NULL)) { 1625c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran return false; 1635c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran } 1645c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran 1655c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran // An iptables rule to mark incoming packets on a network with the netId of the network. 1665c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran // 1675c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran // This is so that the kernel can: 1685c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran // + Use the right fwmark for (and thus correctly route) replies (e.g.: TCP RST, ICMP errors, 169a48118062412f16ae712bfc8c8a539d3b6a85e47Sreeram Ramachandran // ping replies). 1705c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran // + Mark sockets that accept connections from this interface so that the connection stays on 1715c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran // the same interface. 172379bd33f7640e2c4bef902be0ed6cb96378c8c2eSreeram Ramachandran if (modifyIptables) { 173379bd33f7640e2c4bef902be0ed6cb96378c8c2eSreeram Ramachandran action = add ? "-A" : "-D"; 174379bd33f7640e2c4bef902be0ed6cb96378c8c2eSreeram Ramachandran char markString[UINT32_HEX_STRLEN]; 175379bd33f7640e2c4bef902be0ed6cb96378c8c2eSreeram Ramachandran snprintf(markString, sizeof(markString), "0x%x", netId); 176379bd33f7640e2c4bef902be0ed6cb96378c8c2eSreeram Ramachandran if (execIptables(V4V6, "-t", "mangle", action, "INPUT", "-i", interface, "-j", "MARK", 177379bd33f7640e2c4bef902be0ed6cb96378c8c2eSreeram Ramachandran "--set-mark", markString, NULL)) { 178379bd33f7640e2c4bef902be0ed6cb96378c8c2eSreeram Ramachandran return false; 179379bd33f7640e2c4bef902be0ed6cb96378c8c2eSreeram Ramachandran } 1805c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran } 1815c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran 1825c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran return true; 1835c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran} 1845c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran 1859c0d313de6a3157fadd3b52a9927c77216ca435eSreeram Ramachandranbool modifyDefaultNetworkRules(const char* interface, Permission permission, const char* action) { 1869c0d313de6a3157fadd3b52a9927c77216ca435eSreeram Ramachandran uint32_t table = getRouteTableForInterface(interface); 1879c0d313de6a3157fadd3b52a9927c77216ca435eSreeram Ramachandran if (!table) { 1889c0d313de6a3157fadd3b52a9927c77216ca435eSreeram Ramachandran return false; 1899c0d313de6a3157fadd3b52a9927c77216ca435eSreeram Ramachandran } 1909c0d313de6a3157fadd3b52a9927c77216ca435eSreeram Ramachandran 1919c0d313de6a3157fadd3b52a9927c77216ca435eSreeram Ramachandran uint32_t fwmark = getFwmark(0, !FWMARK_USE_EXPLICIT, !FWMARK_USE_PROTECT, permission); 1929c0d313de6a3157fadd3b52a9927c77216ca435eSreeram Ramachandran uint32_t mask = getFwmarkMask(FWMARK_USE_NET_ID, !FWMARK_USE_EXPLICIT, !FWMARK_USE_PROTECT, 1939c0d313de6a3157fadd3b52a9927c77216ca435eSreeram Ramachandran permission); 1949c0d313de6a3157fadd3b52a9927c77216ca435eSreeram Ramachandran 1957619e1bbebdfe643c35ee6be4ac054f5255f0706Sreeram Ramachandran return runIpRuleCommand(action, RULE_PRIORITY_DEFAULT_NETWORK, table, fwmark, mask, NULL); 1967619e1bbebdfe643c35ee6be4ac054f5255f0706Sreeram Ramachandran} 1977619e1bbebdfe643c35ee6be4ac054f5255f0706Sreeram Ramachandran 198c92133732378aae815120c39edd62a7b4eb773b3Sreeram Ramachandranbool modifyRoute(const char* interface, const char* destination, const char* nexthop, 199c92133732378aae815120c39edd62a7b4eb773b3Sreeram Ramachandran const char* action) { 2007619e1bbebdfe643c35ee6be4ac054f5255f0706Sreeram Ramachandran uint32_t table = getRouteTableForInterface(interface); 2017619e1bbebdfe643c35ee6be4ac054f5255f0706Sreeram Ramachandran if (!table) { 2029c0d313de6a3157fadd3b52a9927c77216ca435eSreeram Ramachandran return false; 2039c0d313de6a3157fadd3b52a9927c77216ca435eSreeram Ramachandran } 2049c0d313de6a3157fadd3b52a9927c77216ca435eSreeram Ramachandran 205c92133732378aae815120c39edd62a7b4eb773b3Sreeram Ramachandran if (!runIpRouteCommand(action, table, interface, destination, nexthop)) { 206c92133732378aae815120c39edd62a7b4eb773b3Sreeram Ramachandran return false; 207c92133732378aae815120c39edd62a7b4eb773b3Sreeram Ramachandran } 208c92133732378aae815120c39edd62a7b4eb773b3Sreeram Ramachandran 209c92133732378aae815120c39edd62a7b4eb773b3Sreeram Ramachandran // If there's no nexthop, this is a directly connected route. Add it to the main table also, to 210c92133732378aae815120c39edd62a7b4eb773b3Sreeram Ramachandran // let the kernel find it when validating nexthops when global routes are added. Don't do this 211c92133732378aae815120c39edd62a7b4eb773b3Sreeram Ramachandran // for IPv6, since all directly-connected routes in v6 are link-local and should already be in 212c92133732378aae815120c39edd62a7b4eb773b3Sreeram Ramachandran // the main table. 213c92133732378aae815120c39edd62a7b4eb773b3Sreeram Ramachandran if (!nexthop && !strchr(destination, ':') && 214c92133732378aae815120c39edd62a7b4eb773b3Sreeram Ramachandran !runIpRouteCommand(action, RT_TABLE_MAIN, interface, destination, NULL)) { 215c92133732378aae815120c39edd62a7b4eb773b3Sreeram Ramachandran return false; 216c92133732378aae815120c39edd62a7b4eb773b3Sreeram Ramachandran } 217c92133732378aae815120c39edd62a7b4eb773b3Sreeram Ramachandran 218c92133732378aae815120c39edd62a7b4eb773b3Sreeram Ramachandran return true; 2199c0d313de6a3157fadd3b52a9927c77216ca435eSreeram Ramachandran} 2209c0d313de6a3157fadd3b52a9927c77216ca435eSreeram Ramachandran 22192b66c4990b4a0ab608aa9c31da946f36085203bSreeram Ramachandranbool flushRoutes(const char* interface) { 22292b66c4990b4a0ab608aa9c31da946f36085203bSreeram Ramachandran uint32_t table = getRouteTableForInterface(interface); 22392b66c4990b4a0ab608aa9c31da946f36085203bSreeram Ramachandran if (!table) { 22492b66c4990b4a0ab608aa9c31da946f36085203bSreeram Ramachandran return false; 22592b66c4990b4a0ab608aa9c31da946f36085203bSreeram Ramachandran } 22692b66c4990b4a0ab608aa9c31da946f36085203bSreeram Ramachandran 22792b66c4990b4a0ab608aa9c31da946f36085203bSreeram Ramachandran return runIpRouteCommand("flush", table, NULL, NULL, NULL); 22892b66c4990b4a0ab608aa9c31da946f36085203bSreeram Ramachandran} 22992b66c4990b4a0ab608aa9c31da946f36085203bSreeram Ramachandran 2305c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran} // namespace 2315c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran 2328fe9c8e0a2b1c5cd2a34720efaccc641d9ab8fb6Sreeram Ramachandranvoid RouteController::Init() { 2338fe9c8e0a2b1c5cd2a34720efaccc641d9ab8fb6Sreeram Ramachandran // Add a new rule to look up the 'main' table, with the same selectors as the "default network" 2348fe9c8e0a2b1c5cd2a34720efaccc641d9ab8fb6Sreeram Ramachandran // rule, but with a lower priority. Since the default network rule points to a table with a 2358fe9c8e0a2b1c5cd2a34720efaccc641d9ab8fb6Sreeram Ramachandran // default route, the rule we're adding will never be used for normal routing lookups. However, 2368fe9c8e0a2b1c5cd2a34720efaccc641d9ab8fb6Sreeram Ramachandran // the kernel may fall-through to it to find directly-connected routes when it validates that a 2378fe9c8e0a2b1c5cd2a34720efaccc641d9ab8fb6Sreeram Ramachandran // nexthop (in a route being added) is reachable. 2388fe9c8e0a2b1c5cd2a34720efaccc641d9ab8fb6Sreeram Ramachandran uint32_t fwmark = getFwmark(0, !FWMARK_USE_EXPLICIT, !FWMARK_USE_PROTECT, PERMISSION_NONE); 2398fe9c8e0a2b1c5cd2a34720efaccc641d9ab8fb6Sreeram Ramachandran uint32_t mask = getFwmarkMask(FWMARK_USE_NET_ID, !FWMARK_USE_EXPLICIT, !FWMARK_USE_PROTECT, 2408fe9c8e0a2b1c5cd2a34720efaccc641d9ab8fb6Sreeram Ramachandran PERMISSION_NONE); 2418fe9c8e0a2b1c5cd2a34720efaccc641d9ab8fb6Sreeram Ramachandran runIpRuleCommand(ADD, RULE_PRIORITY_MAIN, RT_TABLE_MAIN, fwmark, mask, NULL); 2428fe9c8e0a2b1c5cd2a34720efaccc641d9ab8fb6Sreeram Ramachandran 2438fe9c8e0a2b1c5cd2a34720efaccc641d9ab8fb6Sreeram Ramachandran// TODO: Uncomment once we are sure everything works. 2448fe9c8e0a2b1c5cd2a34720efaccc641d9ab8fb6Sreeram Ramachandran#if 0 2458fe9c8e0a2b1c5cd2a34720efaccc641d9ab8fb6Sreeram Ramachandran // Add a rule to preempt the pre-defined "from all lookup main" rule. This ensures that packets 2468fe9c8e0a2b1c5cd2a34720efaccc641d9ab8fb6Sreeram Ramachandran // that are already marked with a specific NetId don't fall-through to the main table. 2478fe9c8e0a2b1c5cd2a34720efaccc641d9ab8fb6Sreeram Ramachandran runIpRuleCommand(ADD, RULE_PRIORITY_UNREACHABLE, 0, 0, 0, NULL); 2488fe9c8e0a2b1c5cd2a34720efaccc641d9ab8fb6Sreeram Ramachandran#endif 2498fe9c8e0a2b1c5cd2a34720efaccc641d9ab8fb6Sreeram Ramachandran} 2508fe9c8e0a2b1c5cd2a34720efaccc641d9ab8fb6Sreeram Ramachandran 2515c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandranbool RouteController::createNetwork(unsigned netId, const char* interface, Permission permission) { 2529c0d313de6a3157fadd3b52a9927c77216ca435eSreeram Ramachandran return modifyPerNetworkRules(netId, interface, permission, true, true); 2535c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran} 2545c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran 2555c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandranbool RouteController::destroyNetwork(unsigned netId, const char* interface, Permission permission) { 25692b66c4990b4a0ab608aa9c31da946f36085203bSreeram Ramachandran return modifyPerNetworkRules(netId, interface, permission, false, true) && 25792b66c4990b4a0ab608aa9c31da946f36085203bSreeram Ramachandran flushRoutes(interface); 258379bd33f7640e2c4bef902be0ed6cb96378c8c2eSreeram Ramachandran} 259379bd33f7640e2c4bef902be0ed6cb96378c8c2eSreeram Ramachandran 260379bd33f7640e2c4bef902be0ed6cb96378c8c2eSreeram Ramachandranbool RouteController::modifyNetworkPermission(unsigned netId, const char* interface, 261379bd33f7640e2c4bef902be0ed6cb96378c8c2eSreeram Ramachandran Permission oldPermission, Permission newPermission) { 262379bd33f7640e2c4bef902be0ed6cb96378c8c2eSreeram Ramachandran // Add the new rules before deleting the old ones, to avoid race conditions. 2639c0d313de6a3157fadd3b52a9927c77216ca435eSreeram Ramachandran return modifyPerNetworkRules(netId, interface, newPermission, true, false) && 2649c0d313de6a3157fadd3b52a9927c77216ca435eSreeram Ramachandran modifyPerNetworkRules(netId, interface, oldPermission, false, false); 2659c0d313de6a3157fadd3b52a9927c77216ca435eSreeram Ramachandran} 2669c0d313de6a3157fadd3b52a9927c77216ca435eSreeram Ramachandran 2679c0d313de6a3157fadd3b52a9927c77216ca435eSreeram Ramachandranbool RouteController::addDefaultNetwork(const char* interface, Permission permission) { 2689c0d313de6a3157fadd3b52a9927c77216ca435eSreeram Ramachandran return modifyDefaultNetworkRules(interface, permission, ADD); 2699c0d313de6a3157fadd3b52a9927c77216ca435eSreeram Ramachandran} 2709c0d313de6a3157fadd3b52a9927c77216ca435eSreeram Ramachandran 2719c0d313de6a3157fadd3b52a9927c77216ca435eSreeram Ramachandranbool RouteController::removeDefaultNetwork(const char* interface, Permission permission) { 2729c0d313de6a3157fadd3b52a9927c77216ca435eSreeram Ramachandran return modifyDefaultNetworkRules(interface, permission, DEL); 2735c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran} 2747619e1bbebdfe643c35ee6be4ac054f5255f0706Sreeram Ramachandran 2757619e1bbebdfe643c35ee6be4ac054f5255f0706Sreeram Ramachandranbool RouteController::addRoute(const char* interface, const char* destination, 2767619e1bbebdfe643c35ee6be4ac054f5255f0706Sreeram Ramachandran const char* nexthop) { 277c92133732378aae815120c39edd62a7b4eb773b3Sreeram Ramachandran return modifyRoute(interface, destination, nexthop, ADD); 2787619e1bbebdfe643c35ee6be4ac054f5255f0706Sreeram Ramachandran} 2797619e1bbebdfe643c35ee6be4ac054f5255f0706Sreeram Ramachandran 2807619e1bbebdfe643c35ee6be4ac054f5255f0706Sreeram Ramachandranbool RouteController::removeRoute(const char* interface, const char* destination, 2817619e1bbebdfe643c35ee6be4ac054f5255f0706Sreeram Ramachandran const char* nexthop) { 282c92133732378aae815120c39edd62a7b4eb773b3Sreeram Ramachandran return modifyRoute(interface, destination, nexthop, DEL); 2837619e1bbebdfe643c35ee6be4ac054f5255f0706Sreeram Ramachandran} 284