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" |
Paul Stewart | c39f113 | 2011-06-22 12:02:28 -0700 | [diff] [blame] | 25 | #include "shill/ipconfig.h" |
Paul Stewart | a3c56f9 | 2011-05-26 07:08:52 -0700 | [diff] [blame] | 26 | #include "shill/rtnl_handler.h" |
| 27 | #include "shill/rtnl_listener.h" |
| 28 | #include "shill/shill_event.h" |
| 29 | |
| 30 | using std::string; |
| 31 | |
| 32 | namespace shill { |
| 33 | |
| 34 | RTNLHandler::RTNLHandler() |
| 35 | : running_(false), |
| 36 | in_request_(false), |
Paul Stewart | a3c56f9 | 2011-05-26 07:08:52 -0700 | [diff] [blame] | 37 | rtnl_socket_(-1), |
| 38 | request_flags_(0), |
mukesh agrawal | f60e406 | 2011-05-27 13:13:41 -0700 | [diff] [blame^] | 39 | request_sequence_(0), |
| 40 | rtnl_callback_(NewCallback(this, &RTNLHandler::ParseRTNL)) { |
Paul Stewart | a3c56f9 | 2011-05-26 07:08:52 -0700 | [diff] [blame] | 41 | VLOG(2) << "RTNLHandler created"; |
| 42 | } |
| 43 | |
| 44 | RTNLHandler::~RTNLHandler() { |
| 45 | VLOG(2) << "RTNLHandler removed"; |
| 46 | Stop(); |
| 47 | } |
| 48 | |
| 49 | RTNLHandler* RTNLHandler::GetInstance() { |
| 50 | return Singleton<RTNLHandler>::get(); |
| 51 | } |
| 52 | |
| 53 | void RTNLHandler::Start(EventDispatcher *dispatcher) { |
| 54 | struct sockaddr_nl addr; |
| 55 | |
| 56 | if (running_) |
| 57 | return; |
| 58 | |
| 59 | rtnl_socket_ = socket(PF_NETLINK, SOCK_DGRAM, NETLINK_ROUTE); |
| 60 | if (rtnl_socket_ < 0) { |
| 61 | LOG(ERROR) << "Failed to open rtnl socket"; |
| 62 | return; |
| 63 | } |
| 64 | |
| 65 | memset(&addr, 0, sizeof(addr)); |
| 66 | addr.nl_family = AF_NETLINK; |
| 67 | addr.nl_groups = RTMGRP_LINK | RTMGRP_IPV4_IFADDR | RTMGRP_IPV4_ROUTE; |
| 68 | |
| 69 | if (bind(rtnl_socket_, reinterpret_cast<struct sockaddr *>(&addr), |
| 70 | sizeof(addr)) < 0) { |
| 71 | close(rtnl_socket_); |
| 72 | rtnl_socket_ = -1; |
| 73 | LOG(ERROR) << "RTNL socket bind failed"; |
| 74 | return; |
| 75 | } |
| 76 | |
| 77 | rtnl_handler_.reset(dispatcher->CreateInputHandler(rtnl_socket_, |
| 78 | rtnl_callback_.get())); |
| 79 | running_ = true; |
| 80 | |
| 81 | NextRequest(request_sequence_); |
| 82 | |
| 83 | VLOG(2) << "RTNLHandler started"; |
| 84 | VLOG(2) << "RTNLHandler started"; |
| 85 | } |
| 86 | |
| 87 | void RTNLHandler::Stop() { |
| 88 | if (!running_) |
| 89 | return; |
| 90 | |
| 91 | rtnl_handler_.reset(NULL); |
| 92 | close(rtnl_socket_); |
| 93 | running_ = false; |
| 94 | in_request_ = false; |
| 95 | VLOG(2) << "RTNLHandler stopped"; |
| 96 | } |
| 97 | |
| 98 | void RTNLHandler::AddListener(RTNLListener *to_add) { |
| 99 | std::vector<RTNLListener *>::iterator it; |
| 100 | for (it = listeners_.begin(); it != listeners_.end(); ++it) { |
| 101 | if (to_add == *it) |
| 102 | return; |
| 103 | } |
| 104 | listeners_.push_back(to_add); |
| 105 | VLOG(2) << "RTNLHandler added listener"; |
| 106 | } |
| 107 | |
| 108 | void RTNLHandler::RemoveListener(RTNLListener *to_remove) { |
| 109 | std::vector<RTNLListener *>::iterator it; |
| 110 | for (it = listeners_.begin(); it != listeners_.end(); ++it) { |
| 111 | if (to_remove == *it) { |
| 112 | listeners_.erase(it); |
| 113 | return; |
| 114 | } |
| 115 | } |
| 116 | VLOG(2) << "RTNLHandler removed listener"; |
| 117 | } |
| 118 | |
| 119 | void RTNLHandler::SetInterfaceFlags(int interface_index, unsigned int flags, |
| 120 | unsigned int change) { |
| 121 | struct rtnl_request { |
| 122 | struct nlmsghdr hdr; |
| 123 | struct ifinfomsg msg; |
| 124 | } req; |
| 125 | |
| 126 | request_sequence_++; |
| 127 | memset(&req, 0, sizeof(req)); |
| 128 | |
| 129 | req.hdr.nlmsg_len = sizeof(req); |
| 130 | req.hdr.nlmsg_flags = NLM_F_REQUEST; |
| 131 | req.hdr.nlmsg_pid = 0; |
| 132 | req.hdr.nlmsg_seq = request_sequence_; |
| 133 | req.hdr.nlmsg_type = RTM_NEWLINK; |
| 134 | req.msg.ifi_index = interface_index; |
| 135 | req.msg.ifi_flags = flags; |
| 136 | req.msg.ifi_change = change; |
| 137 | |
| 138 | if (send(rtnl_socket_, &req, sizeof(req), 0) < 0) { |
| 139 | LOG(ERROR) << "RTNL sendto failed: " << strerror(errno); |
| 140 | } |
| 141 | } |
| 142 | |
| 143 | void RTNLHandler::RequestDump(int request_flags) { |
| 144 | request_flags_ |= request_flags; |
| 145 | |
| 146 | VLOG(2) << "RTNLHandler got request to dump " << request_flags; |
| 147 | |
| 148 | if (!in_request_ && running_) |
| 149 | NextRequest(request_sequence_); |
| 150 | } |
| 151 | |
| 152 | void RTNLHandler::DispatchEvent(int type, struct nlmsghdr *hdr) { |
| 153 | std::vector<RTNLListener *>::iterator it; |
| 154 | for (it = listeners_.begin(); it != listeners_.end(); ++it) { |
| 155 | (*it)->NotifyEvent(type, hdr); |
| 156 | } |
| 157 | } |
| 158 | |
| 159 | void RTNLHandler::NextRequest(uint32_t seq) { |
| 160 | struct rtnl_request { |
| 161 | struct nlmsghdr hdr; |
| 162 | struct rtgenmsg msg; |
| 163 | } req; |
| 164 | struct sockaddr_nl addr; |
| 165 | int flag = 0; |
| 166 | |
| 167 | VLOG(2) << "RTNLHandler nextrequest " << seq << " " << request_sequence_ << |
| 168 | " " << request_flags_; |
| 169 | |
| 170 | if (seq != request_sequence_) |
| 171 | return; |
| 172 | |
| 173 | request_sequence_++; |
| 174 | memset(&req, 0, sizeof(req)); |
| 175 | |
| 176 | req.hdr.nlmsg_len = sizeof(req); |
| 177 | req.hdr.nlmsg_flags = NLM_F_REQUEST | NLM_F_DUMP; |
| 178 | req.hdr.nlmsg_pid = 0; |
| 179 | req.hdr.nlmsg_seq = request_sequence_; |
| 180 | req.msg.rtgen_family = AF_INET; |
| 181 | |
| 182 | if ((request_flags_ & kRequestLink) != 0) { |
| 183 | req.hdr.nlmsg_type = RTM_GETLINK; |
| 184 | flag = kRequestLink; |
| 185 | } else if ((request_flags_ & kRequestAddr) != 0) { |
| 186 | req.hdr.nlmsg_type = RTM_GETADDR; |
| 187 | flag = kRequestAddr; |
| 188 | } else if ((request_flags_ & kRequestRoute) != 0) { |
| 189 | req.hdr.nlmsg_type = RTM_GETROUTE; |
| 190 | flag = kRequestRoute; |
| 191 | } else { |
| 192 | in_request_ = false; |
| 193 | return; |
| 194 | } |
| 195 | |
| 196 | memset(&addr, 0, sizeof(addr)); |
| 197 | addr.nl_family = AF_NETLINK; |
| 198 | |
| 199 | if (sendto(rtnl_socket_, &req, sizeof(req), 0, |
| 200 | reinterpret_cast<struct sockaddr *>(&addr), sizeof(addr)) < 0) { |
| 201 | LOG(ERROR) << "RTNL sendto failed"; |
| 202 | return; |
| 203 | } |
| 204 | request_flags_ &= ~flag; |
| 205 | in_request_ = true; |
| 206 | } |
| 207 | |
| 208 | void RTNLHandler::ParseRTNL(InputData *data) { |
| 209 | unsigned char *buf = data->buf; |
| 210 | unsigned char *end = buf + data->len; |
| 211 | |
| 212 | while (buf < end) { |
| 213 | struct nlmsghdr *hdr = reinterpret_cast<struct nlmsghdr *>(buf); |
| 214 | struct nlmsgerr *err; |
| 215 | |
mukesh agrawal | f60e406 | 2011-05-27 13:13:41 -0700 | [diff] [blame^] | 216 | if (!NLMSG_OK(hdr, static_cast<unsigned int>(end - buf))) |
Paul Stewart | a3c56f9 | 2011-05-26 07:08:52 -0700 | [diff] [blame] | 217 | break; |
| 218 | |
| 219 | switch (hdr->nlmsg_type) { |
| 220 | case NLMSG_NOOP: |
| 221 | case NLMSG_OVERRUN: |
| 222 | return; |
| 223 | case NLMSG_DONE: |
| 224 | NextRequest(hdr->nlmsg_seq); |
| 225 | return; |
| 226 | case NLMSG_ERROR: |
| 227 | err = reinterpret_cast<nlmsgerr *>(NLMSG_DATA(hdr)); |
| 228 | LOG(ERROR) << "error " << -err->error << " (" << strerror(-err->error) << |
| 229 | ")"; |
| 230 | return; |
| 231 | case RTM_NEWLINK: |
| 232 | case RTM_DELLINK: |
| 233 | DispatchEvent(kRequestLink, hdr); |
| 234 | break; |
| 235 | case RTM_NEWADDR: |
| 236 | case RTM_DELADDR: |
| 237 | DispatchEvent(kRequestAddr, hdr); |
| 238 | break; |
| 239 | case RTM_NEWROUTE: |
| 240 | case RTM_DELROUTE: |
| 241 | DispatchEvent(kRequestRoute, hdr); |
| 242 | break; |
| 243 | } |
| 244 | |
| 245 | buf += hdr->nlmsg_len; |
| 246 | } |
| 247 | } |
| 248 | |
Paul Stewart | c39f113 | 2011-06-22 12:02:28 -0700 | [diff] [blame] | 249 | static bool AddAtribute(struct nlmsghdr *hdr, int max_msg_size, int attr_type, |
| 250 | const void *attr_data, int attr_len) { |
| 251 | int len = RTA_LENGTH(attr_len); |
| 252 | int new_msg_size = NLMSG_ALIGN(hdr->nlmsg_len) + RTA_ALIGN(len); |
| 253 | struct rtattr *rt_attr; |
| 254 | |
| 255 | if (new_msg_size > max_msg_size) |
| 256 | return false; |
| 257 | |
| 258 | rt_attr = reinterpret_cast<struct rtattr *> (reinterpret_cast<unsigned char *> |
| 259 | (hdr) + |
| 260 | NLMSG_ALIGN(hdr->nlmsg_len)); |
| 261 | rt_attr->rta_type = attr_type; |
| 262 | rt_attr->rta_len = len; |
| 263 | memcpy(RTA_DATA(rt_attr), attr_data, attr_len); |
| 264 | hdr->nlmsg_len = new_msg_size; |
| 265 | return true; |
| 266 | } |
| 267 | |
| 268 | bool RTNLHandler::AddressRequest(int interface_index, int cmd, int flags, |
| 269 | const IPConfig &ipconfig) { |
| 270 | const IPConfig::Properties &properties = ipconfig.properties(); |
| 271 | int address_family; |
| 272 | int address_size; |
| 273 | unsigned char *attrs, *attrs_end; |
| 274 | int max_msg_size; |
| 275 | struct { |
| 276 | struct nlmsghdr hdr; |
| 277 | struct ifaddrmsg ifa; |
| 278 | unsigned char attrs[256]; |
| 279 | } req; |
| 280 | union { |
| 281 | in_addr ip4; |
| 282 | in6_addr in6; |
| 283 | } addr; |
| 284 | |
| 285 | if (properties.address_family == IPConfig::kAddressFamilyIPv4) { |
| 286 | address_family = AF_INET; |
| 287 | address_size = sizeof(struct in_addr); |
| 288 | } else if (properties.address_family == IPConfig::kAddressFamilyIPv6) { |
| 289 | address_family = AF_INET6; |
| 290 | address_size = sizeof(struct in6_addr); |
| 291 | } else |
| 292 | return false; |
| 293 | |
| 294 | request_sequence_++; |
| 295 | memset(&req, 0, sizeof(req)); |
| 296 | req.hdr.nlmsg_len = NLMSG_LENGTH(sizeof(struct ifaddrmsg)); |
| 297 | req.hdr.nlmsg_flags = NLM_F_REQUEST | flags; |
| 298 | req.hdr.nlmsg_type = cmd; |
| 299 | req.ifa.ifa_family = address_family; |
| 300 | req.ifa.ifa_index = interface_index; |
| 301 | |
| 302 | max_msg_size = req.hdr.nlmsg_len + sizeof(req.attrs); |
| 303 | |
| 304 | // TODO(pstew): This code only works for Ethernet-like setups, |
| 305 | // not with devices that have a peer address like PPP. |
| 306 | if (inet_pton(address_family, properties.address.c_str(), &addr) <= 0 || |
| 307 | !AddAtribute(&req.hdr, max_msg_size, IFA_LOCAL, &addr, address_size)) |
| 308 | return false; |
| 309 | |
| 310 | if (inet_pton(address_family, properties.broadcast_address.c_str(), |
| 311 | &addr) <= 0 || |
| 312 | !AddAtribute(&req.hdr, max_msg_size, IFA_BROADCAST, &addr, address_size)) |
| 313 | return false; |
| 314 | |
| 315 | req.ifa.ifa_prefixlen = properties.subnet_cidr; |
| 316 | |
| 317 | if (send(rtnl_socket_, &req, req.hdr.nlmsg_len, 0) < 0) { |
| 318 | LOG(ERROR) << "RTNL sendto failed: " << strerror(errno); |
| 319 | return false; |
| 320 | } |
| 321 | |
| 322 | return true; |
| 323 | } |
| 324 | |
| 325 | bool RTNLHandler::AddInterfaceAddress(int interface_index, |
| 326 | const IPConfig &ipconfig) { |
| 327 | return AddressRequest(interface_index, RTM_NEWADDR, NLM_F_CREATE | NLM_F_EXCL, |
| 328 | ipconfig); |
| 329 | } |
| 330 | |
| 331 | bool RTNLHandler::RemoveInterfaceAddress(int interface_index, |
| 332 | const IPConfig &ipconfig) { |
| 333 | return AddressRequest(interface_index, RTM_DELADDR, 0, ipconfig); |
| 334 | } |
| 335 | |
Paul Stewart | a3c56f9 | 2011-05-26 07:08:52 -0700 | [diff] [blame] | 336 | } // namespace shill |