Paul Stewart | 0af98bf | 2011-05-10 17:38:08 -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 <time.h> |
| 6 | |
| 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 <string> |
| 17 | |
Chris Masone | 0e1d104 | 2011-05-09 18:07:03 -0700 | [diff] [blame^] | 18 | #include <base/callback.h> |
Paul Stewart | 0af98bf | 2011-05-10 17:38:08 -0700 | [diff] [blame] | 19 | #include <base/logging.h> |
Chris Masone | 0e1d104 | 2011-05-09 18:07:03 -0700 | [diff] [blame^] | 20 | #include <base/hash_tables.h> |
| 21 | #include <base/scoped_ptr.h> |
Paul Stewart | 0af98bf | 2011-05-10 17:38:08 -0700 | [diff] [blame] | 22 | |
| 23 | #include "shill/control_interface.h" |
| 24 | #include "shill/service.h" |
| 25 | #include "shill/device_info.h" |
| 26 | |
| 27 | using std::string; |
| 28 | |
| 29 | namespace shill { |
| 30 | DeviceInfo::DeviceInfo(EventDispatcher *dispatcher) |
| 31 | : running_(false), |
| 32 | dispatcher_(dispatcher), |
Chris Masone | 0e1d104 | 2011-05-09 18:07:03 -0700 | [diff] [blame^] | 33 | rtnl_callback_(NewCallback(this, &DeviceInfo::ParseRTNL)), |
Paul Stewart | 0af98bf | 2011-05-10 17:38:08 -0700 | [diff] [blame] | 34 | rtnl_socket_(-1), |
| 35 | request_flags_(0), |
| 36 | request_sequence_(0) { |
| 37 | LOG(INFO) << "DeviceInfo initialized"; |
| 38 | } |
| 39 | |
| 40 | DeviceInfo::~DeviceInfo() { |
| 41 | Stop(); |
| 42 | } |
| 43 | |
| 44 | void DeviceInfo::Start() |
| 45 | { |
| 46 | struct sockaddr_nl addr; |
| 47 | |
| 48 | if (running_) |
| 49 | return; |
| 50 | |
| 51 | rtnl_socket_ = socket(PF_NETLINK, SOCK_DGRAM, NETLINK_ROUTE); |
| 52 | if (rtnl_socket_ < 0) { |
| 53 | LOG(ERROR) << "Failed to open rtnl socket"; |
| 54 | return; |
| 55 | } |
| 56 | |
| 57 | memset(&addr, 0, sizeof(addr)); |
| 58 | addr.nl_family = AF_NETLINK; |
| 59 | addr.nl_groups = RTMGRP_LINK | RTMGRP_IPV4_IFADDR | RTMGRP_IPV4_ROUTE; |
| 60 | |
| 61 | if (bind(rtnl_socket_, (struct sockaddr *) &addr, sizeof(addr)) < 0) { |
| 62 | close(rtnl_socket_); |
| 63 | rtnl_socket_ = -1; |
| 64 | LOG(ERROR) << "RTNL socket bind failed"; |
| 65 | return; |
| 66 | } |
| 67 | |
| 68 | rtnl_handler_.reset(dispatcher_->CreateInputHandler(rtnl_socket_, |
Chris Masone | 0e1d104 | 2011-05-09 18:07:03 -0700 | [diff] [blame^] | 69 | rtnl_callback_.get())); |
Paul Stewart | 0af98bf | 2011-05-10 17:38:08 -0700 | [diff] [blame] | 70 | running_ = true; |
| 71 | |
| 72 | request_flags_ = REQUEST_LINK | REQUEST_ADDR | REQUEST_ROUTE; |
| 73 | NextRequest(request_sequence_); |
| 74 | |
| 75 | LOG(INFO) << "DeviceInfo started"; |
| 76 | } |
| 77 | |
| 78 | void DeviceInfo::Stop() |
| 79 | { |
| 80 | if (!running_) |
| 81 | return; |
| 82 | |
| 83 | rtnl_handler_.reset(NULL); |
| 84 | close(rtnl_socket_); |
| 85 | running_ = false; |
| 86 | } |
| 87 | |
| 88 | void DeviceInfo::NextRequest(uint32_t seq) { |
| 89 | struct rtnl_request { |
| 90 | struct nlmsghdr hdr; |
| 91 | struct rtgenmsg msg; |
| 92 | } req; |
| 93 | struct sockaddr_nl addr; |
| 94 | int flag = 0; |
| 95 | |
| 96 | LOG(INFO) << __func__ << ": " << seq << " :: " << request_sequence_; |
| 97 | |
| 98 | if (seq != request_sequence_) |
| 99 | return; |
| 100 | |
| 101 | request_sequence_++; |
| 102 | memset(&req, 0, sizeof(req)); |
| 103 | |
| 104 | req.hdr.nlmsg_len = sizeof(req); |
| 105 | req.hdr.nlmsg_flags = NLM_F_REQUEST | NLM_F_DUMP; |
| 106 | req.hdr.nlmsg_pid = 0; |
| 107 | req.hdr.nlmsg_seq = request_sequence_; |
| 108 | req.msg.rtgen_family = AF_INET; |
| 109 | |
| 110 | if ((request_flags_ & REQUEST_LINK) != 0) { |
| 111 | req.hdr.nlmsg_type = RTM_GETLINK; |
| 112 | flag = REQUEST_LINK; |
| 113 | } else if ((request_flags_ & REQUEST_ADDR) != 0) { |
| 114 | req.hdr.nlmsg_type = RTM_GETADDR; |
| 115 | flag = REQUEST_ADDR; |
| 116 | } else if ((request_flags_ & REQUEST_ROUTE) != 0) { |
| 117 | req.hdr.nlmsg_type = RTM_GETROUTE; |
| 118 | flag = REQUEST_ROUTE; |
| 119 | } else |
| 120 | return; |
| 121 | |
| 122 | memset(&addr, 0, sizeof(addr)); |
| 123 | addr.nl_family = AF_NETLINK; |
| 124 | |
| 125 | if (sendto(rtnl_socket_, &req, sizeof(req), 0, |
| 126 | (struct sockaddr *) &addr, sizeof(addr)) < 0) { |
| 127 | LOG(ERROR) << "RTNL sendto failed"; |
| 128 | return; |
| 129 | } |
| 130 | request_flags_ &= ~flag; |
| 131 | } |
| 132 | |
| 133 | |
| 134 | void DeviceInfo::LinkMsg(unsigned char *buf, bool del) { |
| 135 | struct nlmsghdr *hdr = (struct nlmsghdr *) buf; |
| 136 | struct ifinfomsg *msg = (struct ifinfomsg *) NLMSG_DATA(hdr); |
| 137 | int bytes = IFLA_PAYLOAD(hdr); |
| 138 | |
| 139 | LOG(INFO) << "index " << msg->ifi_index << " flags " << msg->ifi_flags << |
| 140 | ": del = " << del; |
| 141 | } |
| 142 | |
| 143 | void DeviceInfo::AddrMsg(unsigned char *buf, bool del) { |
| 144 | struct nlmsghdr *hdr = (struct nlmsghdr *) buf; |
| 145 | struct ifinfomsg *msg = (struct ifinfomsg *) NLMSG_DATA(hdr); |
| 146 | LOG(INFO) << "index " << msg->ifi_index << " flags " << msg->ifi_flags << |
| 147 | ": del = " << del; |
| 148 | } |
| 149 | |
| 150 | void DeviceInfo::RouteMsg(unsigned char *buf, bool del) { |
| 151 | struct nlmsghdr *hdr = (struct nlmsghdr *) buf; |
| 152 | struct ifinfomsg *msg = (struct ifinfomsg *) NLMSG_DATA(hdr); |
| 153 | LOG(INFO) << "index " << msg->ifi_index << " flags " << msg->ifi_flags << |
| 154 | ": del = " << del; |
| 155 | } |
| 156 | |
| 157 | void DeviceInfo::ParseRTNL(InputData *data) { |
| 158 | unsigned char *buf = data->buf; |
| 159 | unsigned char *end = buf + data->len; |
| 160 | |
| 161 | while (buf < end) { |
| 162 | struct nlmsghdr *hdr = (struct nlmsghdr *) buf; |
| 163 | struct nlmsgerr *err; |
| 164 | |
| 165 | if (!NLMSG_OK(hdr, end - buf)) |
| 166 | break; |
| 167 | |
| 168 | switch (hdr->nlmsg_type) { |
| 169 | case NLMSG_NOOP: |
| 170 | case NLMSG_OVERRUN: |
| 171 | return; |
| 172 | case NLMSG_DONE: |
| 173 | NextRequest(hdr->nlmsg_seq); |
| 174 | return; |
| 175 | case NLMSG_ERROR: |
| 176 | err = (nlmsgerr *) NLMSG_DATA(hdr); |
| 177 | LOG(ERROR) << "error " << -err->error << " (" << strerror(-err->error) << |
| 178 | ")"; |
| 179 | return; |
| 180 | case RTM_NEWLINK: |
| 181 | LinkMsg(buf, false); |
| 182 | break; |
| 183 | case RTM_DELLINK: |
| 184 | LinkMsg(buf, true); |
| 185 | break; |
| 186 | case RTM_NEWADDR: |
| 187 | AddrMsg(buf, false); |
| 188 | break; |
| 189 | case RTM_DELADDR: |
| 190 | AddrMsg(buf, true); |
| 191 | break; |
| 192 | case RTM_NEWROUTE: |
| 193 | RouteMsg(buf, false); |
| 194 | break; |
| 195 | case RTM_DELROUTE: |
| 196 | RouteMsg(buf, true); |
| 197 | break; |
| 198 | } |
| 199 | |
| 200 | buf += hdr->nlmsg_len; |
| 201 | } |
| 202 | } |
| 203 | |
| 204 | } // namespace shill |