Wade Guthrie | 0d43853 | 2012-05-18 14:18:50 -0700 | [diff] [blame] | 1 | // Copyright (c) 2012 The Chromium OS Authors. All rights reserved. |
| 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/config80211.h" |
| 6 | |
| 7 | #include <ctype.h> |
| 8 | |
| 9 | #include <netlink/msg.h> |
| 10 | |
| 11 | #include <map> |
| 12 | #include <sstream> |
| 13 | #include <string> |
| 14 | |
| 15 | #include <base/memory/weak_ptr.h> |
Wade Guthrie | d615361 | 2012-08-23 11:36:14 -0700 | [diff] [blame] | 16 | #include <base/stl_util.h> |
Wade Guthrie | 0d43853 | 2012-05-18 14:18:50 -0700 | [diff] [blame] | 17 | #include <base/stringprintf.h> |
| 18 | |
| 19 | #include "shill/io_handler.h" |
| 20 | #include "shill/logging.h" |
| 21 | #include "shill/nl80211_socket.h" |
| 22 | #include "shill/scope_logger.h" |
| 23 | #include "shill/user_bound_nlmessage.h" |
| 24 | |
| 25 | using base::Bind; |
| 26 | using base::LazyInstance; |
| 27 | using base::StringAppendF; |
Wade Guthrie | 0d43853 | 2012-05-18 14:18:50 -0700 | [diff] [blame] | 28 | using std::string; |
| 29 | |
| 30 | namespace shill { |
| 31 | |
| 32 | namespace { |
| 33 | LazyInstance<Config80211> g_config80211 = LAZY_INSTANCE_INITIALIZER; |
Wade Guthrie | 0d43853 | 2012-05-18 14:18:50 -0700 | [diff] [blame] | 34 | } // namespace |
| 35 | |
Wade Guthrie | d615361 | 2012-08-23 11:36:14 -0700 | [diff] [blame] | 36 | Config80211::EventTypeStrings *Config80211::event_types_ = NULL; |
Wade Guthrie | 0d43853 | 2012-05-18 14:18:50 -0700 | [diff] [blame] | 37 | |
| 38 | Config80211::Config80211() |
Wade Guthrie | d615361 | 2012-08-23 11:36:14 -0700 | [diff] [blame] | 39 | : wifi_state_(kWifiDown), |
| 40 | dispatcher_(NULL), |
Wade Guthrie | 0d43853 | 2012-05-18 14:18:50 -0700 | [diff] [blame] | 41 | weak_ptr_factory_(this), |
| 42 | dispatcher_callback_(Bind(&Config80211::HandleIncomingEvents, |
| 43 | weak_ptr_factory_.GetWeakPtr())), |
| 44 | sock_(NULL) { |
| 45 | } |
| 46 | |
| 47 | Config80211::~Config80211() { |
| 48 | // Since Config80211 is a singleton, it should be safe to delete a static |
| 49 | // member. |
| 50 | delete event_types_; |
| 51 | event_types_ = NULL; |
| 52 | } |
| 53 | |
| 54 | Config80211 *Config80211::GetInstance() { |
| 55 | return g_config80211.Pointer(); |
| 56 | } |
| 57 | |
Wade Guthrie | d615361 | 2012-08-23 11:36:14 -0700 | [diff] [blame] | 58 | void Config80211::Reset() { |
| 59 | wifi_state_ = kWifiDown; |
| 60 | subscribed_events_.clear(); |
| 61 | } |
| 62 | |
Wade Guthrie | 0d43853 | 2012-05-18 14:18:50 -0700 | [diff] [blame] | 63 | bool Config80211::Init(EventDispatcher *dispatcher) { |
| 64 | if (!sock_) { |
| 65 | sock_ = new Nl80211Socket; |
| 66 | if (!sock_) { |
| 67 | LOG(ERROR) << "No memory"; |
| 68 | return false; |
| 69 | } |
| 70 | |
| 71 | if (!sock_->Init()) { |
| 72 | return false; |
| 73 | } |
| 74 | } |
| 75 | |
| 76 | if (!event_types_) { |
Wade Guthrie | d615361 | 2012-08-23 11:36:14 -0700 | [diff] [blame] | 77 | event_types_ = new EventTypeStrings; |
Wade Guthrie | 0d43853 | 2012-05-18 14:18:50 -0700 | [diff] [blame] | 78 | (*event_types_)[Config80211::kEventTypeConfig] = "config"; |
| 79 | (*event_types_)[Config80211::kEventTypeScan] = "scan"; |
| 80 | (*event_types_)[Config80211::kEventTypeRegulatory] = "regulatory"; |
| 81 | (*event_types_)[Config80211::kEventTypeMlme] = "mlme"; |
| 82 | } |
| 83 | |
| 84 | // Install ourselves in the shill mainloop so we receive messages on the |
| 85 | // nl80211 socket. |
| 86 | dispatcher_ = dispatcher; |
| 87 | if (dispatcher_) { |
| 88 | dispatcher_handler_.reset( |
| 89 | dispatcher_->CreateReadyHandler(GetFd(), |
| 90 | IOHandler::kModeInput, |
| 91 | dispatcher_callback_)); |
| 92 | } |
| 93 | return true; |
| 94 | } |
| 95 | |
| 96 | // static |
| 97 | bool Config80211::GetEventTypeString(EventType type, string *value) { |
| 98 | if (!value) { |
| 99 | LOG(ERROR) << "NULL |value|"; |
| 100 | return false; |
| 101 | } |
| 102 | if (!event_types_) { |
| 103 | LOG(ERROR) << "NULL |event_types_|"; |
| 104 | return false; |
| 105 | } |
| 106 | |
Wade Guthrie | d615361 | 2012-08-23 11:36:14 -0700 | [diff] [blame] | 107 | EventTypeStrings::iterator match = (*event_types_).find(type); |
Wade Guthrie | 0d43853 | 2012-05-18 14:18:50 -0700 | [diff] [blame] | 108 | if (match == (*event_types_).end()) { |
| 109 | LOG(ERROR) << "Event type " << type << " not found"; |
| 110 | return false; |
| 111 | } |
| 112 | *value = match->second; |
| 113 | return true; |
| 114 | } |
| 115 | |
Wade Guthrie | d615361 | 2012-08-23 11:36:14 -0700 | [diff] [blame] | 116 | void Config80211::SetWifiState(WifiState new_state) { |
| 117 | if (wifi_state_ == new_state) { |
| 118 | return; |
| 119 | } |
| 120 | |
| 121 | // If we're newly-up, subscribe to all the event types that have been |
| 122 | // requested. |
| 123 | if (new_state == kWifiUp) { |
| 124 | SubscribedEvents::const_iterator i; |
| 125 | for (i = subscribed_events_.begin(); i != subscribed_events_.end(); ++i) { |
Wade Guthrie | d615361 | 2012-08-23 11:36:14 -0700 | [diff] [blame] | 126 | ActuallySubscribeToEvents(*i); |
| 127 | } |
| 128 | } |
| 129 | wifi_state_ = new_state; |
| 130 | } |
| 131 | |
Wade Guthrie | 0d43853 | 2012-05-18 14:18:50 -0700 | [diff] [blame] | 132 | bool Config80211::SubscribeToEvents(EventType type) { |
Wade Guthrie | d615361 | 2012-08-23 11:36:14 -0700 | [diff] [blame] | 133 | bool it_worked = true; |
| 134 | if (!ContainsKey(subscribed_events_, type)) { |
| 135 | if (wifi_state_ == kWifiUp) { |
| 136 | it_worked = ActuallySubscribeToEvents(type); |
| 137 | } |
| 138 | // |subscribed_events_| is a list of events to which we want to subscribe |
| 139 | // when wifi comes up (including when it comes _back_ up after it goes |
| 140 | // down sometime in the future). |
| 141 | subscribed_events_.insert(type); |
| 142 | } |
| 143 | return it_worked; |
| 144 | } |
| 145 | |
| 146 | bool Config80211::ActuallySubscribeToEvents(EventType type) { |
Wade Guthrie | 0d43853 | 2012-05-18 14:18:50 -0700 | [diff] [blame] | 147 | string group_name; |
| 148 | |
| 149 | if (!GetEventTypeString(type, &group_name)) { |
| 150 | return false; |
| 151 | } |
| 152 | if (!sock_->AddGroupMembership(group_name)) { |
| 153 | return false; |
| 154 | } |
Wade Guthrie | 0d43853 | 2012-05-18 14:18:50 -0700 | [diff] [blame] | 155 | // No sequence checking for multicast messages. |
| 156 | if (!sock_->DisableSequenceChecking()) { |
| 157 | return false; |
| 158 | } |
| 159 | |
| 160 | // Install the global NetLink Callback for messages along with a parameter. |
| 161 | // The Netlink Callback's parameter is passed to 'C' as a 'void *'. |
| 162 | if (!sock_->SetNetlinkCallback(OnNlMessageReceived, |
| 163 | static_cast<void *>( |
| 164 | const_cast<Config80211::Callback *>( |
| 165 | &default_callback_)))) { |
| 166 | return false; |
| 167 | } |
| 168 | return true; |
| 169 | } |
| 170 | |
| 171 | void Config80211::HandleIncomingEvents(int unused_fd) { |
| 172 | sock_->GetMessages(); |
| 173 | } |
| 174 | |
| 175 | // NOTE: the "struct nl_msg" declaration, below, is a complete fabrication |
| 176 | // (but one consistent with the nl_socket_modify_cb call to which |
| 177 | // |OnNlMessageReceived| is a parameter). |raw_message| is actually a |
| 178 | // "struct sk_buff" but that data type is only visible in the kernel. We'll |
| 179 | // scrub this erroneous datatype with the "nlmsg_hdr" call, below, which |
| 180 | // extracts an nlmsghdr pointer from |raw_message|. |
| 181 | int Config80211::OnNlMessageReceived(struct nl_msg *raw_message, |
| 182 | void *user_callback_object) { |
| 183 | SLOG(WiFi, 6) << "\t Entering " << __func__ |
| 184 | << "( msg:" << raw_message |
| 185 | << ", cb:" << user_callback_object << ")"; |
| 186 | |
| 187 | string output("@"); |
| 188 | |
| 189 | nlmsghdr *msg = nlmsg_hdr(raw_message); |
| 190 | |
| 191 | scoped_ptr<UserBoundNlMessage> message( |
| 192 | UserBoundNlMessageFactory::CreateMessage(msg)); |
| 193 | if (message == NULL) { |
| 194 | output.append("unknown event"); |
| 195 | } else { |
| 196 | if (user_callback_object) { |
| 197 | Config80211::Callback *bound_object = |
| 198 | static_cast<Config80211::Callback *> (user_callback_object); |
| 199 | if (!bound_object->is_null()) { |
| 200 | bound_object->Run(*message); |
| 201 | } |
| 202 | } |
| 203 | StringAppendF(&output, "%s", message->ToString().c_str()); |
| 204 | } |
| 205 | |
| 206 | SLOG(WiFi, 5) << output; |
| 207 | |
| 208 | return NL_SKIP; // Skip current message, continue parsing buffer. |
| 209 | } |
| 210 | |
Wade Guthrie | 0d43853 | 2012-05-18 14:18:50 -0700 | [diff] [blame] | 211 | } // namespace shill. |