Paul Stewart | a3c56f9 | 2011-05-26 07:08:52 -0700 | [diff] [blame] | 1 | // Copyright (c) 2011 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 <errno.h> |
| 6 | #include <time.h> |
| 7 | #include <unistd.h> |
| 8 | #include <string.h> |
| 9 | #include <sys/socket.h> |
| 10 | #include <arpa/inet.h> |
| 11 | #include <netinet/ether.h> |
| 12 | #include <net/if.h> |
| 13 | #include <net/if_arp.h> |
| 14 | #include <linux/netlink.h> |
| 15 | #include <linux/rtnetlink.h> |
| 16 | #include <fcntl.h> |
| 17 | #include <string> |
| 18 | |
| 19 | #include <base/callback_old.h> |
| 20 | #include <base/logging.h> |
| 21 | #include <base/memory/scoped_ptr.h> |
| 22 | #include <base/memory/singleton.h> |
| 23 | |
| 24 | #include "shill/io_handler.h" |
| 25 | #include "shill/rtnl_handler.h" |
| 26 | #include "shill/rtnl_listener.h" |
| 27 | #include "shill/shill_event.h" |
| 28 | |
| 29 | using std::string; |
| 30 | |
| 31 | namespace shill { |
| 32 | |
| 33 | RTNLHandler::RTNLHandler() |
| 34 | : running_(false), |
| 35 | in_request_(false), |
| 36 | rtnl_callback_(NewCallback(this, &RTNLHandler::ParseRTNL)), |
| 37 | rtnl_socket_(-1), |
| 38 | request_flags_(0), |
| 39 | request_sequence_(0) { |
| 40 | VLOG(2) << "RTNLHandler created"; |
| 41 | } |
| 42 | |
| 43 | RTNLHandler::~RTNLHandler() { |
| 44 | VLOG(2) << "RTNLHandler removed"; |
| 45 | Stop(); |
| 46 | } |
| 47 | |
| 48 | RTNLHandler* RTNLHandler::GetInstance() { |
| 49 | return Singleton<RTNLHandler>::get(); |
| 50 | } |
| 51 | |
| 52 | void RTNLHandler::Start(EventDispatcher *dispatcher) { |
| 53 | struct sockaddr_nl addr; |
| 54 | |
| 55 | if (running_) |
| 56 | return; |
| 57 | |
| 58 | rtnl_socket_ = socket(PF_NETLINK, SOCK_DGRAM, NETLINK_ROUTE); |
| 59 | if (rtnl_socket_ < 0) { |
| 60 | LOG(ERROR) << "Failed to open rtnl socket"; |
| 61 | return; |
| 62 | } |
| 63 | |
| 64 | memset(&addr, 0, sizeof(addr)); |
| 65 | addr.nl_family = AF_NETLINK; |
| 66 | addr.nl_groups = RTMGRP_LINK | RTMGRP_IPV4_IFADDR | RTMGRP_IPV4_ROUTE; |
| 67 | |
| 68 | if (bind(rtnl_socket_, reinterpret_cast<struct sockaddr *>(&addr), |
| 69 | sizeof(addr)) < 0) { |
| 70 | close(rtnl_socket_); |
| 71 | rtnl_socket_ = -1; |
| 72 | LOG(ERROR) << "RTNL socket bind failed"; |
| 73 | return; |
| 74 | } |
| 75 | |
| 76 | rtnl_handler_.reset(dispatcher->CreateInputHandler(rtnl_socket_, |
| 77 | rtnl_callback_.get())); |
| 78 | running_ = true; |
| 79 | |
| 80 | NextRequest(request_sequence_); |
| 81 | |
| 82 | VLOG(2) << "RTNLHandler started"; |
| 83 | VLOG(2) << "RTNLHandler started"; |
| 84 | } |
| 85 | |
| 86 | void RTNLHandler::Stop() { |
| 87 | if (!running_) |
| 88 | return; |
| 89 | |
| 90 | rtnl_handler_.reset(NULL); |
| 91 | close(rtnl_socket_); |
| 92 | running_ = false; |
| 93 | in_request_ = false; |
| 94 | VLOG(2) << "RTNLHandler stopped"; |
| 95 | } |
| 96 | |
| 97 | void RTNLHandler::AddListener(RTNLListener *to_add) { |
| 98 | std::vector<RTNLListener *>::iterator it; |
| 99 | for (it = listeners_.begin(); it != listeners_.end(); ++it) { |
| 100 | if (to_add == *it) |
| 101 | return; |
| 102 | } |
| 103 | listeners_.push_back(to_add); |
| 104 | VLOG(2) << "RTNLHandler added listener"; |
| 105 | } |
| 106 | |
| 107 | void RTNLHandler::RemoveListener(RTNLListener *to_remove) { |
| 108 | std::vector<RTNLListener *>::iterator it; |
| 109 | for (it = listeners_.begin(); it != listeners_.end(); ++it) { |
| 110 | if (to_remove == *it) { |
| 111 | listeners_.erase(it); |
| 112 | return; |
| 113 | } |
| 114 | } |
| 115 | VLOG(2) << "RTNLHandler removed listener"; |
| 116 | } |
| 117 | |
| 118 | void RTNLHandler::SetInterfaceFlags(int interface_index, unsigned int flags, |
| 119 | unsigned int change) { |
| 120 | struct rtnl_request { |
| 121 | struct nlmsghdr hdr; |
| 122 | struct ifinfomsg msg; |
| 123 | } req; |
| 124 | |
| 125 | request_sequence_++; |
| 126 | memset(&req, 0, sizeof(req)); |
| 127 | |
| 128 | req.hdr.nlmsg_len = sizeof(req); |
| 129 | req.hdr.nlmsg_flags = NLM_F_REQUEST; |
| 130 | req.hdr.nlmsg_pid = 0; |
| 131 | req.hdr.nlmsg_seq = request_sequence_; |
| 132 | req.hdr.nlmsg_type = RTM_NEWLINK; |
| 133 | req.msg.ifi_index = interface_index; |
| 134 | req.msg.ifi_flags = flags; |
| 135 | req.msg.ifi_change = change; |
| 136 | |
| 137 | if (send(rtnl_socket_, &req, sizeof(req), 0) < 0) { |
| 138 | LOG(ERROR) << "RTNL sendto failed: " << strerror(errno); |
| 139 | } |
| 140 | } |
| 141 | |
| 142 | void RTNLHandler::RequestDump(int request_flags) { |
| 143 | request_flags_ |= request_flags; |
| 144 | |
| 145 | VLOG(2) << "RTNLHandler got request to dump " << request_flags; |
| 146 | |
| 147 | if (!in_request_ && running_) |
| 148 | NextRequest(request_sequence_); |
| 149 | } |
| 150 | |
| 151 | void RTNLHandler::DispatchEvent(int type, struct nlmsghdr *hdr) { |
| 152 | std::vector<RTNLListener *>::iterator it; |
| 153 | for (it = listeners_.begin(); it != listeners_.end(); ++it) { |
| 154 | (*it)->NotifyEvent(type, hdr); |
| 155 | } |
| 156 | } |
| 157 | |
| 158 | void RTNLHandler::NextRequest(uint32_t seq) { |
| 159 | struct rtnl_request { |
| 160 | struct nlmsghdr hdr; |
| 161 | struct rtgenmsg msg; |
| 162 | } req; |
| 163 | struct sockaddr_nl addr; |
| 164 | int flag = 0; |
| 165 | |
| 166 | VLOG(2) << "RTNLHandler nextrequest " << seq << " " << request_sequence_ << |
| 167 | " " << request_flags_; |
| 168 | |
| 169 | if (seq != request_sequence_) |
| 170 | return; |
| 171 | |
| 172 | request_sequence_++; |
| 173 | memset(&req, 0, sizeof(req)); |
| 174 | |
| 175 | req.hdr.nlmsg_len = sizeof(req); |
| 176 | req.hdr.nlmsg_flags = NLM_F_REQUEST | NLM_F_DUMP; |
| 177 | req.hdr.nlmsg_pid = 0; |
| 178 | req.hdr.nlmsg_seq = request_sequence_; |
| 179 | req.msg.rtgen_family = AF_INET; |
| 180 | |
| 181 | if ((request_flags_ & kRequestLink) != 0) { |
| 182 | req.hdr.nlmsg_type = RTM_GETLINK; |
| 183 | flag = kRequestLink; |
| 184 | } else if ((request_flags_ & kRequestAddr) != 0) { |
| 185 | req.hdr.nlmsg_type = RTM_GETADDR; |
| 186 | flag = kRequestAddr; |
| 187 | } else if ((request_flags_ & kRequestRoute) != 0) { |
| 188 | req.hdr.nlmsg_type = RTM_GETROUTE; |
| 189 | flag = kRequestRoute; |
| 190 | } else { |
| 191 | in_request_ = false; |
| 192 | return; |
| 193 | } |
| 194 | |
| 195 | memset(&addr, 0, sizeof(addr)); |
| 196 | addr.nl_family = AF_NETLINK; |
| 197 | |
| 198 | if (sendto(rtnl_socket_, &req, sizeof(req), 0, |
| 199 | reinterpret_cast<struct sockaddr *>(&addr), sizeof(addr)) < 0) { |
| 200 | LOG(ERROR) << "RTNL sendto failed"; |
| 201 | return; |
| 202 | } |
| 203 | request_flags_ &= ~flag; |
| 204 | in_request_ = true; |
| 205 | } |
| 206 | |
| 207 | void RTNLHandler::ParseRTNL(InputData *data) { |
| 208 | unsigned char *buf = data->buf; |
| 209 | unsigned char *end = buf + data->len; |
| 210 | |
| 211 | while (buf < end) { |
| 212 | struct nlmsghdr *hdr = reinterpret_cast<struct nlmsghdr *>(buf); |
| 213 | struct nlmsgerr *err; |
| 214 | |
| 215 | if (!NLMSG_OK(hdr, end - buf)) |
| 216 | break; |
| 217 | |
| 218 | switch (hdr->nlmsg_type) { |
| 219 | case NLMSG_NOOP: |
| 220 | case NLMSG_OVERRUN: |
| 221 | return; |
| 222 | case NLMSG_DONE: |
| 223 | NextRequest(hdr->nlmsg_seq); |
| 224 | return; |
| 225 | case NLMSG_ERROR: |
| 226 | err = reinterpret_cast<nlmsgerr *>(NLMSG_DATA(hdr)); |
| 227 | LOG(ERROR) << "error " << -err->error << " (" << strerror(-err->error) << |
| 228 | ")"; |
| 229 | return; |
| 230 | case RTM_NEWLINK: |
| 231 | case RTM_DELLINK: |
| 232 | DispatchEvent(kRequestLink, hdr); |
| 233 | break; |
| 234 | case RTM_NEWADDR: |
| 235 | case RTM_DELADDR: |
| 236 | DispatchEvent(kRequestAddr, hdr); |
| 237 | break; |
| 238 | case RTM_NEWROUTE: |
| 239 | case RTM_DELROUTE: |
| 240 | DispatchEvent(kRequestRoute, hdr); |
| 241 | break; |
| 242 | } |
| 243 | |
| 244 | buf += hdr->nlmsg_len; |
| 245 | } |
| 246 | } |
| 247 | |
| 248 | } // namespace shill |