mukesh agrawal | ddc378f | 2012-02-17 18:26:20 -0800 | [diff] [blame] | 1 | // Copyright (c) 2012 The Chromium OS Authors. All rights reserved. |
Paul Stewart | dd60e45 | 2011-08-08 11:38:36 -0700 | [diff] [blame] | 2 | // Use of this source code is governed by a BSD-style license that can be |
| 3 | // found in the LICENSE file. |
| 4 | |
| 5 | #include "shill/connection.h" |
| 6 | |
Paul Stewart | 9a90808 | 2011-08-31 12:18:48 -0700 | [diff] [blame] | 7 | #include <arpa/inet.h> |
| 8 | #include <linux/rtnetlink.h> |
| 9 | |
| 10 | #include "shill/device_info.h" |
Paul Stewart | dd60e45 | 2011-08-08 11:38:36 -0700 | [diff] [blame] | 11 | #include "shill/resolver.h" |
| 12 | #include "shill/routing_table.h" |
| 13 | #include "shill/rtnl_handler.h" |
| 14 | |
| 15 | using std::string; |
| 16 | |
| 17 | namespace shill { |
| 18 | |
| 19 | // static |
| 20 | const uint32 Connection::kDefaultMetric = 1; |
| 21 | // static |
Paul Stewart | 7cfca04 | 2011-12-08 14:18:17 -0800 | [diff] [blame] | 22 | const uint32 Connection::kNonDefaultMetricBase = 10; |
Paul Stewart | dd60e45 | 2011-08-08 11:38:36 -0700 | [diff] [blame] | 23 | |
Paul Stewart | 9a90808 | 2011-08-31 12:18:48 -0700 | [diff] [blame] | 24 | Connection::Connection(int interface_index, |
| 25 | const std::string& interface_name, |
Paul Stewart | e00600e | 2012-03-16 07:08:00 -0700 | [diff] [blame^] | 26 | Technology::Identifier technology, |
Paul Stewart | 9a90808 | 2011-08-31 12:18:48 -0700 | [diff] [blame] | 27 | const DeviceInfo *device_info) |
Paul Stewart | dd60e45 | 2011-08-08 11:38:36 -0700 | [diff] [blame] | 28 | : is_default_(false), |
Paul Stewart | c8f4bef | 2011-12-13 09:45:51 -0800 | [diff] [blame] | 29 | routing_request_count_(0), |
Paul Stewart | dd60e45 | 2011-08-08 11:38:36 -0700 | [diff] [blame] | 30 | interface_index_(interface_index), |
| 31 | interface_name_(interface_name), |
Paul Stewart | e00600e | 2012-03-16 07:08:00 -0700 | [diff] [blame^] | 32 | technology_(technology), |
Paul Stewart | 9a90808 | 2011-08-31 12:18:48 -0700 | [diff] [blame] | 33 | device_info_(device_info), |
Paul Stewart | dd60e45 | 2011-08-08 11:38:36 -0700 | [diff] [blame] | 34 | resolver_(Resolver::GetInstance()), |
| 35 | routing_table_(RoutingTable::GetInstance()), |
| 36 | rtnl_handler_(RTNLHandler::GetInstance()) { |
| 37 | VLOG(2) << __func__; |
| 38 | } |
| 39 | |
| 40 | Connection::~Connection() { |
mukesh agrawal | 2c15d2c | 2012-02-21 16:09:21 -0800 | [diff] [blame] | 41 | VLOG(2) << __func__ << " " << interface_name_; |
Paul Stewart | 9a90808 | 2011-08-31 12:18:48 -0700 | [diff] [blame] | 42 | |
Paul Stewart | c8f4bef | 2011-12-13 09:45:51 -0800 | [diff] [blame] | 43 | DCHECK(!routing_request_count_); |
Thieu Le | fb46caf | 2012-03-08 11:57:15 -0800 | [diff] [blame] | 44 | routing_table_->FlushRoutes(interface_index_); |
Paul Stewart | 9a90808 | 2011-08-31 12:18:48 -0700 | [diff] [blame] | 45 | device_info_->FlushAddresses(interface_index_); |
Paul Stewart | dd60e45 | 2011-08-08 11:38:36 -0700 | [diff] [blame] | 46 | } |
| 47 | |
| 48 | void Connection::UpdateFromIPConfig(const IPConfigRefPtr &config) { |
mukesh agrawal | 2c15d2c | 2012-02-21 16:09:21 -0800 | [diff] [blame] | 49 | VLOG(2) << __func__ << " " << interface_name_; |
Paul Stewart | e613202 | 2011-08-16 09:11:02 -0700 | [diff] [blame] | 50 | |
Paul Stewart | 9a90808 | 2011-08-31 12:18:48 -0700 | [diff] [blame] | 51 | const IPConfig::Properties &properties = config->properties(); |
| 52 | IPAddress local(properties.address_family); |
| 53 | if (!local.SetAddressFromString(properties.address)) { |
| 54 | LOG(ERROR) << "Local address " << properties.address << " is invalid"; |
| 55 | return; |
| 56 | } |
| 57 | local.set_prefix(properties.subnet_cidr); |
| 58 | |
| 59 | IPAddress broadcast(properties.address_family); |
Paul Stewart | e00600e | 2012-03-16 07:08:00 -0700 | [diff] [blame^] | 60 | if (!broadcast.SetAddressFromString(properties.broadcast_address) && |
| 61 | technology_ != Technology::kTunnel) { |
Paul Stewart | 9a90808 | 2011-08-31 12:18:48 -0700 | [diff] [blame] | 62 | LOG(ERROR) << "Broadcast address " << properties.broadcast_address |
| 63 | << " is invalid"; |
| 64 | return; |
| 65 | } |
| 66 | |
| 67 | rtnl_handler_->AddInterfaceAddress(interface_index_, local, broadcast); |
Paul Stewart | dd60e45 | 2011-08-08 11:38:36 -0700 | [diff] [blame] | 68 | |
Paul Stewart | 7cfca04 | 2011-12-08 14:18:17 -0800 | [diff] [blame] | 69 | routing_table_->SetDefaultRoute(interface_index_, config, |
| 70 | GetMetric(is_default_)); |
Paul Stewart | dd60e45 | 2011-08-08 11:38:36 -0700 | [diff] [blame] | 71 | |
Paul Stewart | 3f68bb1 | 2012-03-15 13:33:10 -0700 | [diff] [blame] | 72 | // Install any explicitly configured routes at the default metric. |
| 73 | routing_table_->ConfigureRoutes(interface_index_, config, kDefaultMetric); |
| 74 | |
Paul Stewart | dd60e45 | 2011-08-08 11:38:36 -0700 | [diff] [blame] | 75 | // Save a copy of the last non-null DNS config |
| 76 | if (!config->properties().dns_servers.empty()) { |
| 77 | dns_servers_ = config->properties().dns_servers; |
| 78 | dns_domain_search_ = config->properties().domain_search; |
| 79 | } |
| 80 | |
| 81 | if (is_default_) { |
| 82 | resolver_->SetDNSFromIPConfig(config); |
| 83 | } |
| 84 | } |
| 85 | |
Paul Stewart | c1dec4d | 2011-12-08 15:25:28 -0800 | [diff] [blame] | 86 | void Connection::SetIsDefault(bool is_default) { |
mukesh agrawal | 2c15d2c | 2012-02-21 16:09:21 -0800 | [diff] [blame] | 87 | VLOG(2) << __func__ << " " |
| 88 | << interface_name_ << " (index " << interface_index_ << ") " |
| 89 | << is_default_ << " -> " << is_default; |
Paul Stewart | dd60e45 | 2011-08-08 11:38:36 -0700 | [diff] [blame] | 90 | if (is_default == is_default_) { |
| 91 | return; |
| 92 | } |
| 93 | |
Paul Stewart | 7cfca04 | 2011-12-08 14:18:17 -0800 | [diff] [blame] | 94 | routing_table_->SetDefaultMetric(interface_index_, GetMetric(is_default)); |
Paul Stewart | dd60e45 | 2011-08-08 11:38:36 -0700 | [diff] [blame] | 95 | |
Paul Stewart | c681fa0 | 2012-03-02 19:40:04 -0800 | [diff] [blame] | 96 | is_default_ = is_default; |
| 97 | |
Paul Stewart | dd60e45 | 2011-08-08 11:38:36 -0700 | [diff] [blame] | 98 | if (is_default) { |
| 99 | resolver_->SetDNSFromLists(dns_servers_, dns_domain_search_); |
Paul Stewart | c681fa0 | 2012-03-02 19:40:04 -0800 | [diff] [blame] | 100 | DeviceRefPtr device = device_info_->GetDevice(interface_index_); |
| 101 | if (device) { |
| 102 | device->RequestPortalDetection(); |
| 103 | } |
Paul Stewart | dd60e45 | 2011-08-08 11:38:36 -0700 | [diff] [blame] | 104 | } |
Paul Stewart | dd60e45 | 2011-08-08 11:38:36 -0700 | [diff] [blame] | 105 | } |
| 106 | |
Paul Stewart | c8f4bef | 2011-12-13 09:45:51 -0800 | [diff] [blame] | 107 | void Connection::RequestRouting() { |
| 108 | if (routing_request_count_++ == 0) { |
| 109 | DeviceRefPtr device = device_info_->GetDevice(interface_index_); |
| 110 | DCHECK(device.get()); |
| 111 | if (!device.get()) { |
| 112 | LOG(ERROR) << "Device is NULL!"; |
| 113 | return; |
| 114 | } |
| 115 | device->DisableReversePathFilter(); |
| 116 | } |
| 117 | } |
| 118 | |
| 119 | void Connection::ReleaseRouting() { |
| 120 | DCHECK(routing_request_count_ > 0); |
| 121 | if (--routing_request_count_ == 0) { |
| 122 | DeviceRefPtr device = device_info_->GetDevice(interface_index_); |
| 123 | DCHECK(device.get()); |
| 124 | if (!device.get()) { |
| 125 | LOG(ERROR) << "Device is NULL!"; |
| 126 | return; |
| 127 | } |
| 128 | device->EnableReversePathFilter(); |
| 129 | |
| 130 | // Clear any cached routes that might have accumulated while reverse-path |
| 131 | // filtering was disabled. |
| 132 | routing_table_->FlushCache(); |
| 133 | } |
| 134 | } |
| 135 | |
Paul Stewart | f748a36 | 2012-03-07 12:01:20 -0800 | [diff] [blame] | 136 | bool Connection::RequestHostRoute(const IPAddress &address) { |
| 137 | // Set the prefix to be the entire address size. |
| 138 | IPAddress address_prefix(address); |
| 139 | address_prefix.set_prefix(address_prefix.GetLength() * 8); |
| 140 | |
| 141 | if (!routing_table_->RequestRouteToHost(address_prefix, interface_index_)) { |
| 142 | LOG(ERROR) << "Could not request route to " << address.ToString(); |
| 143 | return false; |
| 144 | } |
| 145 | |
| 146 | return true; |
| 147 | } |
| 148 | |
Paul Stewart | 7cfca04 | 2011-12-08 14:18:17 -0800 | [diff] [blame] | 149 | uint32 Connection::GetMetric(bool is_default) { |
| 150 | // If this is not the default route, assign a metric based on the interface |
| 151 | // index. This way all non-default routes (even to the same gateway IP) end |
| 152 | // up with unique metrics so they do not collide. |
| 153 | return is_default ? kDefaultMetric : kNonDefaultMetricBase + interface_index_; |
| 154 | } |
| 155 | |
Paul Stewart | dd60e45 | 2011-08-08 11:38:36 -0700 | [diff] [blame] | 156 | } // namespace shill |