Paul Stewart | dd7df79 | 2011-07-15 11:09:50 -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 "shill/rtnl_message.h" |
| 6 | |
| 7 | #include <base/logging.h> |
| 8 | |
| 9 | #include <sys/socket.h> |
| 10 | #include <linux/netlink.h> |
| 11 | #include <linux/rtnetlink.h> |
| 12 | |
| 13 | namespace shill { |
| 14 | |
| 15 | struct RTNLHeader { |
| 16 | RTNLHeader() { |
| 17 | memset(this, 0, sizeof(*this)); |
| 18 | } |
| 19 | struct nlmsghdr hdr; |
| 20 | union { |
| 21 | struct ifinfomsg ifi; |
| 22 | struct ifaddrmsg ifa; |
| 23 | struct rtmsg rtm; |
| 24 | struct rtgenmsg gen; |
| 25 | }; |
| 26 | }; |
| 27 | |
| 28 | RTNLMessage::RTNLMessage() |
Paul Stewart | 9a90808 | 2011-08-31 12:18:48 -0700 | [diff] [blame] | 29 | : type_(kTypeUnknown), |
| 30 | mode_(kModeUnknown), |
Paul Stewart | dd7df79 | 2011-07-15 11:09:50 -0700 | [diff] [blame] | 31 | flags_(0), |
| 32 | interface_index_(0), |
Paul Stewart | 7355ce1 | 2011-09-02 10:47:01 -0700 | [diff] [blame] | 33 | family_(IPAddress::kFamilyUnknown) {} |
Paul Stewart | dd7df79 | 2011-07-15 11:09:50 -0700 | [diff] [blame] | 34 | |
Paul Stewart | 9a90808 | 2011-08-31 12:18:48 -0700 | [diff] [blame] | 35 | RTNLMessage::RTNLMessage(Type type, |
| 36 | Mode mode, |
Paul Stewart | dd7df79 | 2011-07-15 11:09:50 -0700 | [diff] [blame] | 37 | unsigned int flags, |
| 38 | uint32 seq, |
| 39 | uint32 pid, |
| 40 | int interface_index, |
| 41 | IPAddress::Family family) |
| 42 | : type_(type), |
| 43 | mode_(mode), |
| 44 | flags_(flags), |
| 45 | seq_(seq), |
| 46 | pid_(pid), |
| 47 | interface_index_(interface_index), |
| 48 | family_(family) {} |
| 49 | |
| 50 | bool RTNLMessage::Decode(const ByteString &msg) { |
| 51 | bool ret = DecodeInternal(msg); |
| 52 | if (!ret) { |
Paul Stewart | 9a90808 | 2011-08-31 12:18:48 -0700 | [diff] [blame] | 53 | mode_ = kModeUnknown; |
| 54 | type_ = kTypeUnknown; |
Paul Stewart | dd7df79 | 2011-07-15 11:09:50 -0700 | [diff] [blame] | 55 | } |
| 56 | return ret; |
| 57 | } |
| 58 | |
| 59 | bool RTNLMessage::DecodeInternal(const ByteString &msg) { |
| 60 | const RTNLHeader *hdr = |
| 61 | reinterpret_cast<const RTNLHeader *>(msg.GetConstData()); |
| 62 | |
| 63 | if (msg.GetLength() < sizeof(hdr->hdr) || |
| 64 | msg.GetLength() < hdr->hdr.nlmsg_len) |
| 65 | return false; |
| 66 | |
Paul Stewart | 9a90808 | 2011-08-31 12:18:48 -0700 | [diff] [blame] | 67 | Mode mode = kModeUnknown; |
Paul Stewart | dd7df79 | 2011-07-15 11:09:50 -0700 | [diff] [blame] | 68 | switch (hdr->hdr.nlmsg_type) { |
| 69 | case RTM_NEWLINK: |
| 70 | case RTM_NEWADDR: |
| 71 | case RTM_NEWROUTE: |
Paul Stewart | 9a90808 | 2011-08-31 12:18:48 -0700 | [diff] [blame] | 72 | mode = kModeAdd; |
Paul Stewart | dd7df79 | 2011-07-15 11:09:50 -0700 | [diff] [blame] | 73 | break; |
| 74 | |
| 75 | case RTM_DELLINK: |
| 76 | case RTM_DELADDR: |
| 77 | case RTM_DELROUTE: |
Paul Stewart | 9a90808 | 2011-08-31 12:18:48 -0700 | [diff] [blame] | 78 | mode = kModeDelete; |
Paul Stewart | dd7df79 | 2011-07-15 11:09:50 -0700 | [diff] [blame] | 79 | break; |
| 80 | |
| 81 | default: |
| 82 | return false; |
| 83 | } |
| 84 | |
| 85 | rtattr *attr_data = NULL; |
| 86 | int attr_length = 0; |
| 87 | |
| 88 | switch (hdr->hdr.nlmsg_type) { |
| 89 | case RTM_NEWLINK: |
| 90 | case RTM_DELLINK: |
| 91 | if (!DecodeLink(hdr, mode, &attr_data, &attr_length)) |
| 92 | return false; |
| 93 | break; |
| 94 | |
| 95 | case RTM_NEWADDR: |
| 96 | case RTM_DELADDR: |
| 97 | if (!DecodeAddress(hdr, mode, &attr_data, &attr_length)) |
| 98 | return false; |
| 99 | break; |
| 100 | |
| 101 | case RTM_NEWROUTE: |
| 102 | case RTM_DELROUTE: |
| 103 | if (!DecodeRoute(hdr, mode, &attr_data, &attr_length)) |
| 104 | return false; |
| 105 | break; |
| 106 | |
| 107 | default: |
| 108 | NOTREACHED(); |
| 109 | } |
| 110 | |
| 111 | flags_ = hdr->hdr.nlmsg_flags; |
| 112 | seq_ = hdr->hdr.nlmsg_seq; |
| 113 | pid_ = hdr->hdr.nlmsg_pid; |
| 114 | |
| 115 | while (attr_data && RTA_OK(attr_data, attr_length)) { |
| 116 | SetAttribute( |
| 117 | attr_data->rta_type, |
| 118 | ByteString(reinterpret_cast<unsigned char *>(RTA_DATA(attr_data)), |
| 119 | RTA_PAYLOAD(attr_data))); |
| 120 | attr_data = RTA_NEXT(attr_data, attr_length); |
| 121 | } |
| 122 | |
| 123 | if (attr_length) { |
| 124 | // We hit a parse error while going through the attributes |
| 125 | attributes_.clear(); |
| 126 | return false; |
| 127 | } |
| 128 | |
| 129 | return true; |
| 130 | } |
| 131 | |
| 132 | bool RTNLMessage::DecodeLink(const RTNLHeader *hdr, |
Paul Stewart | 9a90808 | 2011-08-31 12:18:48 -0700 | [diff] [blame] | 133 | Mode mode, |
Paul Stewart | dd7df79 | 2011-07-15 11:09:50 -0700 | [diff] [blame] | 134 | rtattr **attr_data, |
| 135 | int *attr_length) { |
| 136 | if (hdr->hdr.nlmsg_len < NLMSG_LENGTH(sizeof(hdr->ifi))) { |
| 137 | return false; |
| 138 | } |
| 139 | |
| 140 | mode_ = mode; |
| 141 | *attr_data = IFLA_RTA(NLMSG_DATA(&hdr->hdr)); |
| 142 | *attr_length = IFLA_PAYLOAD(&hdr->hdr); |
| 143 | |
Paul Stewart | 9a90808 | 2011-08-31 12:18:48 -0700 | [diff] [blame] | 144 | type_ = kTypeLink; |
Paul Stewart | dd7df79 | 2011-07-15 11:09:50 -0700 | [diff] [blame] | 145 | family_ = hdr->ifi.ifi_family; |
| 146 | interface_index_ = hdr->ifi.ifi_index; |
| 147 | set_link_status(LinkStatus(hdr->ifi.ifi_type, |
| 148 | hdr->ifi.ifi_flags, |
| 149 | hdr->ifi.ifi_change)); |
| 150 | return true; |
| 151 | } |
| 152 | |
| 153 | bool RTNLMessage::DecodeAddress(const RTNLHeader *hdr, |
Paul Stewart | 9a90808 | 2011-08-31 12:18:48 -0700 | [diff] [blame] | 154 | Mode mode, |
Paul Stewart | dd7df79 | 2011-07-15 11:09:50 -0700 | [diff] [blame] | 155 | rtattr **attr_data, |
| 156 | int *attr_length) { |
| 157 | if (hdr->hdr.nlmsg_len < NLMSG_LENGTH(sizeof(hdr->ifa))) { |
| 158 | return false; |
| 159 | } |
| 160 | mode_ = mode; |
| 161 | *attr_data = IFA_RTA(NLMSG_DATA(&hdr->hdr)); |
| 162 | *attr_length = IFA_PAYLOAD(&hdr->hdr); |
| 163 | |
Paul Stewart | 9a90808 | 2011-08-31 12:18:48 -0700 | [diff] [blame] | 164 | type_ = kTypeAddress; |
Paul Stewart | dd7df79 | 2011-07-15 11:09:50 -0700 | [diff] [blame] | 165 | family_ = hdr->ifa.ifa_family; |
| 166 | interface_index_ = hdr->ifa.ifa_index; |
| 167 | set_address_status(AddressStatus(hdr->ifa.ifa_prefixlen, |
| 168 | hdr->ifa.ifa_flags, |
| 169 | hdr->ifa.ifa_scope)); |
| 170 | return true; |
| 171 | } |
| 172 | |
| 173 | bool RTNLMessage::DecodeRoute(const RTNLHeader *hdr, |
Paul Stewart | 9a90808 | 2011-08-31 12:18:48 -0700 | [diff] [blame] | 174 | Mode mode, |
Paul Stewart | dd7df79 | 2011-07-15 11:09:50 -0700 | [diff] [blame] | 175 | rtattr **attr_data, |
| 176 | int *attr_length) { |
| 177 | if (hdr->hdr.nlmsg_len < NLMSG_LENGTH(sizeof(hdr->rtm))) { |
| 178 | return false; |
| 179 | } |
| 180 | mode_ = mode; |
| 181 | *attr_data = RTM_RTA(NLMSG_DATA(&hdr->hdr)); |
| 182 | *attr_length = RTM_PAYLOAD(&hdr->hdr); |
| 183 | |
Paul Stewart | 9a90808 | 2011-08-31 12:18:48 -0700 | [diff] [blame] | 184 | type_ = kTypeRoute; |
Paul Stewart | dd7df79 | 2011-07-15 11:09:50 -0700 | [diff] [blame] | 185 | family_ = hdr->rtm.rtm_family; |
| 186 | set_route_status(RouteStatus(hdr->rtm.rtm_dst_len, |
| 187 | hdr->rtm.rtm_src_len, |
| 188 | hdr->rtm.rtm_table, |
| 189 | hdr->rtm.rtm_protocol, |
| 190 | hdr->rtm.rtm_scope, |
| 191 | hdr->rtm.rtm_type, |
| 192 | hdr->rtm.rtm_flags)); |
| 193 | return true; |
| 194 | } |
| 195 | |
| 196 | ByteString RTNLMessage::Encode() { |
Paul Stewart | 9a90808 | 2011-08-31 12:18:48 -0700 | [diff] [blame] | 197 | if (type_ != kTypeLink && |
| 198 | type_ != kTypeAddress && |
| 199 | type_ != kTypeRoute) { |
Paul Stewart | dd7df79 | 2011-07-15 11:09:50 -0700 | [diff] [blame] | 200 | return ByteString(); |
| 201 | } |
| 202 | |
| 203 | RTNLHeader hdr; |
| 204 | hdr.hdr.nlmsg_flags = flags_; |
| 205 | hdr.hdr.nlmsg_seq = seq_; |
| 206 | hdr.hdr.nlmsg_pid = pid_; |
| 207 | hdr.hdr.nlmsg_seq = 0; |
| 208 | |
Paul Stewart | 9a90808 | 2011-08-31 12:18:48 -0700 | [diff] [blame] | 209 | if (mode_ == kModeGet) { |
| 210 | if (type_ == kTypeLink) { |
Paul Stewart | dd7df79 | 2011-07-15 11:09:50 -0700 | [diff] [blame] | 211 | hdr.hdr.nlmsg_type = RTM_GETLINK; |
Paul Stewart | 9a90808 | 2011-08-31 12:18:48 -0700 | [diff] [blame] | 212 | } else if (type_ == kTypeAddress) { |
Paul Stewart | dd7df79 | 2011-07-15 11:09:50 -0700 | [diff] [blame] | 213 | hdr.hdr.nlmsg_type = RTM_GETADDR; |
Paul Stewart | 9a90808 | 2011-08-31 12:18:48 -0700 | [diff] [blame] | 214 | } else if (type_ == kTypeRoute) { |
Paul Stewart | dd7df79 | 2011-07-15 11:09:50 -0700 | [diff] [blame] | 215 | hdr.hdr.nlmsg_type = RTM_GETROUTE; |
| 216 | } |
| 217 | hdr.hdr.nlmsg_len = NLMSG_LENGTH(sizeof(hdr.gen)); |
Paul Stewart | 9a90808 | 2011-08-31 12:18:48 -0700 | [diff] [blame] | 218 | hdr.hdr.nlmsg_flags = NLM_F_REQUEST | NLM_F_DUMP; |
Paul Stewart | dd7df79 | 2011-07-15 11:09:50 -0700 | [diff] [blame] | 219 | hdr.gen.rtgen_family = family_; |
| 220 | } else { |
| 221 | switch (type_) { |
Paul Stewart | 9a90808 | 2011-08-31 12:18:48 -0700 | [diff] [blame] | 222 | case kTypeLink: |
Paul Stewart | dd7df79 | 2011-07-15 11:09:50 -0700 | [diff] [blame] | 223 | EncodeLink(&hdr); |
| 224 | break; |
| 225 | |
Paul Stewart | 9a90808 | 2011-08-31 12:18:48 -0700 | [diff] [blame] | 226 | case kTypeAddress: |
Paul Stewart | dd7df79 | 2011-07-15 11:09:50 -0700 | [diff] [blame] | 227 | EncodeAddress(&hdr); |
| 228 | break; |
| 229 | |
Paul Stewart | 9a90808 | 2011-08-31 12:18:48 -0700 | [diff] [blame] | 230 | case kTypeRoute: |
Paul Stewart | dd7df79 | 2011-07-15 11:09:50 -0700 | [diff] [blame] | 231 | EncodeRoute(&hdr); |
| 232 | break; |
| 233 | |
| 234 | default: |
| 235 | NOTREACHED(); |
| 236 | } |
| 237 | } |
| 238 | |
| 239 | size_t header_length = hdr.hdr.nlmsg_len; |
| 240 | ByteString attributes; |
| 241 | |
| 242 | base::hash_map<uint16, ByteString>::iterator attr; |
| 243 | for (attr = attributes_.begin(); attr != attributes_.end(); ++attr) { |
| 244 | size_t len = RTA_LENGTH(attr->second.GetLength()); |
| 245 | hdr.hdr.nlmsg_len = NLMSG_ALIGN(hdr.hdr.nlmsg_len) + RTA_ALIGN(len); |
| 246 | |
| 247 | struct rtattr rt_attr = { len, attr->first }; |
| 248 | ByteString attr_header(reinterpret_cast<unsigned char *>(&rt_attr), |
| 249 | sizeof(rt_attr)); |
| 250 | attr_header.Resize(RTA_ALIGN(attr_header.GetLength())); |
| 251 | attributes.Append(attr_header); |
| 252 | |
| 253 | ByteString attr_data(attr->second); |
| 254 | attr_data.Resize(RTA_ALIGN(attr_data.GetLength())); |
| 255 | attributes.Append(attr_data); |
| 256 | } |
| 257 | |
| 258 | ByteString packet(reinterpret_cast<unsigned char *>(&hdr), header_length); |
| 259 | packet.Append(attributes); |
| 260 | |
| 261 | return packet; |
| 262 | } |
| 263 | |
| 264 | void RTNLMessage::EncodeLink(RTNLHeader *hdr) { |
Paul Stewart | 9a90808 | 2011-08-31 12:18:48 -0700 | [diff] [blame] | 265 | hdr->hdr.nlmsg_type = (mode_ == kModeAdd) ? RTM_NEWLINK : RTM_DELLINK; |
Paul Stewart | dd7df79 | 2011-07-15 11:09:50 -0700 | [diff] [blame] | 266 | hdr->hdr.nlmsg_len = NLMSG_LENGTH(sizeof(hdr->ifi)); |
| 267 | hdr->ifi.ifi_family = family_; |
| 268 | hdr->ifi.ifi_type = link_status_.type; |
| 269 | hdr->ifi.ifi_flags = link_status_.flags; |
| 270 | hdr->ifi.ifi_change = link_status_.change; |
| 271 | } |
| 272 | |
| 273 | void RTNLMessage::EncodeAddress(RTNLHeader *hdr) { |
Paul Stewart | 9a90808 | 2011-08-31 12:18:48 -0700 | [diff] [blame] | 274 | hdr->hdr.nlmsg_type = (mode_ == kModeAdd) ? RTM_NEWADDR : RTM_DELADDR; |
Paul Stewart | dd7df79 | 2011-07-15 11:09:50 -0700 | [diff] [blame] | 275 | hdr->hdr.nlmsg_len = NLMSG_LENGTH(sizeof(hdr->ifa)); |
| 276 | hdr->ifa.ifa_family = family_; |
| 277 | hdr->ifa.ifa_prefixlen = address_status_.prefix_len; |
| 278 | hdr->ifa.ifa_flags = address_status_.flags; |
| 279 | hdr->ifa.ifa_scope = address_status_.scope; |
| 280 | hdr->ifa.ifa_index = interface_index_; |
| 281 | } |
| 282 | |
| 283 | void RTNLMessage::EncodeRoute(RTNLHeader *hdr) { |
Paul Stewart | 9a90808 | 2011-08-31 12:18:48 -0700 | [diff] [blame] | 284 | hdr->hdr.nlmsg_type = (mode_ == kModeAdd) ? RTM_NEWROUTE : RTM_DELROUTE; |
Paul Stewart | dd7df79 | 2011-07-15 11:09:50 -0700 | [diff] [blame] | 285 | hdr->hdr.nlmsg_len = NLMSG_LENGTH(sizeof(hdr->rtm)); |
| 286 | hdr->rtm.rtm_family = family_; |
| 287 | hdr->rtm.rtm_dst_len = route_status_.dst_prefix; |
| 288 | hdr->rtm.rtm_src_len = route_status_.src_prefix; |
| 289 | hdr->rtm.rtm_table = route_status_.table; |
| 290 | hdr->rtm.rtm_protocol = route_status_.protocol; |
| 291 | hdr->rtm.rtm_scope = route_status_.scope; |
| 292 | hdr->rtm.rtm_type = route_status_.type; |
| 293 | hdr->rtm.rtm_flags = route_status_.flags; |
| 294 | } |
| 295 | |
| 296 | } // namespace shill |