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 | // This code is derived from the 'iw' source code. The copyright and license |
| 6 | // of that code is as follows: |
| 7 | // |
| 8 | // Copyright (c) 2007, 2008 Johannes Berg |
| 9 | // Copyright (c) 2007 Andy Lutomirski |
| 10 | // Copyright (c) 2007 Mike Kershaw |
| 11 | // Copyright (c) 2008-2009 Luis R. Rodriguez |
| 12 | // |
| 13 | // Permission to use, copy, modify, and/or distribute this software for any |
| 14 | // purpose with or without fee is hereby granted, provided that the above |
| 15 | // copyright notice and this permission notice appear in all copies. |
| 16 | // |
| 17 | // THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES |
| 18 | // WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF |
| 19 | // MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR |
| 20 | // ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES |
| 21 | // WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN |
| 22 | // ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF |
| 23 | // OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. |
| 24 | |
| 25 | #include "shill/nl80211_socket.h" |
| 26 | |
| 27 | #include <ctype.h> |
| 28 | #include <errno.h> |
| 29 | |
| 30 | #include <net/if.h> |
| 31 | #include <netlink/attr.h> |
| 32 | #include <netlink/genl/ctrl.h> |
| 33 | #include <netlink/genl/family.h> |
| 34 | #include <netlink/genl/genl.h> |
| 35 | #include <netlink/msg.h> |
| 36 | #include <netlink/netlink.h> |
| 37 | |
| 38 | #include <iomanip> |
| 39 | #include <sstream> |
| 40 | #include <string> |
| 41 | |
| 42 | #include <base/logging.h> |
| 43 | |
| 44 | #include "shill/kernel_bound_nlmessage.h" |
| 45 | #include "shill/logging.h" |
| 46 | #include "shill/netlink_socket.h" |
| 47 | #include "shill/scope_logger.h" |
| 48 | #include "shill/user_bound_nlmessage.h" |
| 49 | |
| 50 | using std::string; |
| 51 | |
| 52 | namespace shill { |
| 53 | |
| 54 | const char Nl80211Socket::kSocketFamilyName[] = "nl80211"; |
| 55 | |
| 56 | bool Nl80211Socket::Init() { |
| 57 | if (!NetlinkSocket::Init()) { |
| 58 | LOG(ERROR) << "NetlinkSocket didn't initialize."; |
| 59 | return false; |
| 60 | } |
| 61 | |
| 62 | nl80211_id_ = genl_ctrl_resolve(GetNlSock(), "nlctrl"); |
| 63 | if (nl80211_id_ < 0) { |
| 64 | LOG(ERROR) << "nl80211 not found."; |
| 65 | return false; |
| 66 | } |
| 67 | |
Wade Guthrie | d615361 | 2012-08-23 11:36:14 -0700 | [diff] [blame] | 68 | LOG(INFO) << "Nl80211Socket initialized successfully"; |
Wade Guthrie | 0d43853 | 2012-05-18 14:18:50 -0700 | [diff] [blame] | 69 | return true; |
| 70 | } |
| 71 | |
| 72 | bool Nl80211Socket::AddGroupMembership(const string &group_name) { |
| 73 | int id = GetMulticastGroupId(group_name); |
| 74 | if (id < 0) { |
| 75 | LOG(ERROR) << "No Id for group " << group_name; |
| 76 | return false; |
| 77 | } else { |
| 78 | int result = nl_socket_add_membership(GetNlSock(), id); |
| 79 | if (result != 0) { |
| 80 | LOG(ERROR) << "Failed call to 'nl_socket_add_membership': " << result; |
| 81 | return false; |
| 82 | } |
| 83 | } |
Wade Guthrie | d615361 | 2012-08-23 11:36:14 -0700 | [diff] [blame] | 84 | LOG(INFO) << " Group " << group_name << " added successfully"; |
Wade Guthrie | 0d43853 | 2012-05-18 14:18:50 -0700 | [diff] [blame] | 85 | return true; |
| 86 | } |
| 87 | |
| 88 | int Nl80211Socket::OnAck(struct nl_msg *unused_msg, void *arg) { |
| 89 | if (arg) { |
| 90 | int *ret = reinterpret_cast<int *>(arg); |
| 91 | *ret = 0; |
| 92 | } |
| 93 | return NL_STOP; // Stop parsing and discard remainder of buffer. |
| 94 | } |
| 95 | |
| 96 | int Nl80211Socket::OnError(struct sockaddr_nl *unused_nla, struct nlmsgerr *err, |
| 97 | void *arg) { |
| 98 | int *ret = reinterpret_cast<int *>(arg); |
| 99 | if (err) { |
| 100 | if (ret) |
| 101 | *ret = err->error; |
| 102 | LOG(ERROR) << "Error(" << err->error << ") " << strerror(err->error); |
| 103 | } else { |
| 104 | if (ret) |
| 105 | *ret = -1; |
| 106 | LOG(ERROR) << "Error(<unknown>)"; |
| 107 | } |
| 108 | return NL_STOP; // Stop parsing and discard remainder of buffer. |
| 109 | } |
| 110 | |
| 111 | int Nl80211Socket::OnFamilyResponse(struct nl_msg *msg, void *arg) { |
| 112 | if (!msg) { |
| 113 | LOG(ERROR) << "NULL |msg| parameter"; |
| 114 | return NL_SKIP; // Skip current message, continue parsing buffer. |
| 115 | } |
| 116 | |
| 117 | if (!arg) { |
| 118 | LOG(ERROR) << "NULL |arg| parameter"; |
| 119 | return NL_SKIP; // Skip current message, continue parsing buffer. |
| 120 | } |
| 121 | |
| 122 | struct HandlerArgs *grp = reinterpret_cast<struct HandlerArgs *>(arg); |
| 123 | struct nlattr *tb[CTRL_ATTR_MAX + 1]; |
| 124 | struct genlmsghdr *gnlh = reinterpret_cast<struct genlmsghdr *>( |
| 125 | nlmsg_data(nlmsg_hdr(msg))); |
| 126 | struct nlattr *mcgrp = NULL; |
| 127 | int rem_mcgrp; |
| 128 | |
| 129 | nla_parse(tb, CTRL_ATTR_MAX, genlmsg_attrdata(gnlh, 0), |
| 130 | genlmsg_attrlen(gnlh, 0), NULL); |
| 131 | |
| 132 | if (!tb[CTRL_ATTR_MCAST_GROUPS]) |
| 133 | return NL_SKIP; // Skip current message, continue parsing buffer. |
| 134 | |
| 135 | // nla_for_each_nested(...) |
| 136 | mcgrp = reinterpret_cast<nlattr *>(nla_data(tb[CTRL_ATTR_MCAST_GROUPS])); |
| 137 | rem_mcgrp = nla_len(tb[CTRL_ATTR_MCAST_GROUPS]); |
| 138 | bool found_one = false; |
| 139 | for (; nla_ok(mcgrp, rem_mcgrp); mcgrp = nla_next(mcgrp, &(rem_mcgrp))) { |
| 140 | struct nlattr *tb_mcgrp[CTRL_ATTR_MCAST_GRP_MAX + 1]; |
| 141 | |
| 142 | nla_parse(tb_mcgrp, CTRL_ATTR_MCAST_GRP_MAX, |
| 143 | reinterpret_cast<nlattr *>(nla_data(mcgrp)), nla_len(mcgrp), NULL); |
| 144 | |
| 145 | if (!tb_mcgrp[CTRL_ATTR_MCAST_GRP_NAME]) { |
| 146 | LOG(ERROR) << "No group name in 'group' message"; |
| 147 | continue; |
| 148 | } else if (!tb_mcgrp[CTRL_ATTR_MCAST_GRP_ID]) { |
| 149 | LOG(ERROR) << "No group id in 'group' message"; |
| 150 | continue; |
| 151 | } |
| 152 | |
| 153 | if (strncmp(reinterpret_cast<char *>( |
| 154 | nla_data(tb_mcgrp[CTRL_ATTR_MCAST_GRP_NAME])), |
| 155 | grp->group, nla_len(tb_mcgrp[CTRL_ATTR_MCAST_GRP_NAME]))) { |
| 156 | continue; |
| 157 | } |
| 158 | found_one = true; |
| 159 | grp->id = nla_get_u32(tb_mcgrp[CTRL_ATTR_MCAST_GRP_ID]); |
| 160 | SLOG(WiFi, 6) << "GROUP '" |
| 161 | << reinterpret_cast<char *>( |
| 162 | nla_data(tb_mcgrp[CTRL_ATTR_MCAST_GRP_NAME])) |
| 163 | << "' has ID " |
| 164 | << grp->id; |
| 165 | break; |
| 166 | } |
| 167 | if (!found_one) { |
| 168 | LOG(ERROR) << "NO GROUP matched '" |
| 169 | << grp->group |
| 170 | << "', the one for which we were looking"; |
| 171 | } |
| 172 | |
| 173 | return NL_SKIP; // Skip current message, continue parsing buffer. |
| 174 | } |
| 175 | |
| 176 | int Nl80211Socket::GetMulticastGroupId(const string &group) { |
| 177 | // Allocate and build the message. |
| 178 | KernelBoundNlMessage message; |
| 179 | if (!message.Init()) { |
| 180 | LOG(ERROR) << "Couldn't initialize message"; |
| 181 | return -1; |
| 182 | } |
| 183 | |
| 184 | if (!message.AddNetlinkHeader(NL_AUTO_PID, NL_AUTO_SEQ, GetFamilyId(), 0, 0, |
| 185 | CTRL_CMD_GETFAMILY, 0)) |
| 186 | return -1; |
| 187 | |
| 188 | int result = message.AddAttribute(CTRL_ATTR_FAMILY_NAME, |
| 189 | GetSocketFamilyName().length() + 1, |
| 190 | GetSocketFamilyName().c_str()); |
| 191 | if (result < 0) { |
| 192 | LOG(ERROR) << "nla_put return error: " << result; |
| 193 | return -1; |
| 194 | } |
| 195 | |
| 196 | if (!message.Send(this)) { |
| 197 | return -1; |
| 198 | } |
| 199 | |
| 200 | // Wait for the response. |
| 201 | |
| 202 | NetlinkSocket::Callback netlink_callback; |
| 203 | struct HandlerArgs grp(group.c_str(), -ENOENT); |
| 204 | int status = 1; |
| 205 | |
| 206 | if (netlink_callback.Init()) { |
| 207 | if (!netlink_callback.ErrHandler(NL_CB_CUSTOM, OnError, &status)) { |
| 208 | return -1; |
| 209 | } |
| 210 | if (!netlink_callback.SetHandler(NL_CB_ACK, NL_CB_CUSTOM, OnAck, &status)) { |
| 211 | return -1; |
| 212 | } |
| 213 | if (!netlink_callback.SetHandler(NL_CB_VALID, NL_CB_CUSTOM, |
| 214 | OnFamilyResponse, &grp)) { |
| 215 | return -1; |
| 216 | } |
| 217 | } else { |
| 218 | LOG(ERROR) << "Couldn't initialize callback"; |
| 219 | return -1; |
| 220 | } |
| 221 | |
| 222 | while (status > 0) { // 'status' is set by the NL_CB_ACK handler. |
| 223 | if (!GetMessagesUsingCallback(&netlink_callback)) { |
| 224 | return -1; |
| 225 | } |
| 226 | } |
| 227 | |
| 228 | if (status != 0) { |
| 229 | return -1; |
| 230 | } |
| 231 | |
| 232 | return grp.id; |
| 233 | } |
| 234 | |
| 235 | } // namespace shill |