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/netlink_socket.h" |
| 26 | |
| 27 | #include <ctype.h> |
| 28 | #include <errno.h> |
Wade Guthrie | b1ec860 | 2012-10-18 17:26:14 -0700 | [diff] [blame] | 29 | #include <string.h> |
Wade Guthrie | 0d43853 | 2012-05-18 14:18:50 -0700 | [diff] [blame] | 30 | |
| 31 | #include <net/if.h> |
| 32 | #include <netlink/attr.h> |
| 33 | #include <netlink/genl/ctrl.h> |
| 34 | #include <netlink/genl/family.h> |
| 35 | #include <netlink/genl/genl.h> |
| 36 | #include <netlink/msg.h> |
| 37 | #include <netlink/netlink.h> |
| 38 | |
| 39 | #include <iomanip> |
| 40 | |
| 41 | #include <base/logging.h> |
| 42 | |
| 43 | #include "shill/kernel_bound_nlmessage.h" |
| 44 | #include "shill/scope_logger.h" |
| 45 | |
| 46 | namespace shill { |
| 47 | |
| 48 | // |
| 49 | // NetlinkSocket::Callback. |
| 50 | // |
| 51 | |
| 52 | NetlinkSocket::Callback::~Callback() { |
| 53 | if (cb_) { |
| 54 | nl_cb_put(cb_); |
| 55 | cb_ = NULL; |
| 56 | } |
| 57 | } |
| 58 | |
| 59 | bool NetlinkSocket::Callback::Init() { |
| 60 | cb_ = nl_cb_alloc(NL_CB_DEFAULT); |
| 61 | if (!cb_) { |
| 62 | LOG(ERROR) << "NULL cb_"; |
| 63 | return false; |
| 64 | } |
| 65 | return true; |
| 66 | } |
| 67 | |
| 68 | bool NetlinkSocket::Callback::ErrHandler(enum nl_cb_kind kind, |
| 69 | nl_recvmsg_err_cb_t func, |
| 70 | void *arg) { |
| 71 | int result = nl_cb_err(cb_, kind, func, arg); |
| 72 | if (result) { |
| 73 | LOG(ERROR) << "nl_cb_err returned " << result; |
| 74 | return false; |
| 75 | } |
| 76 | return true; |
| 77 | } |
| 78 | |
| 79 | bool NetlinkSocket::Callback::SetHandler(enum nl_cb_type type, |
| 80 | enum nl_cb_kind kind, |
| 81 | nl_recvmsg_msg_cb_t func, |
| 82 | void *arg) { |
| 83 | int result = nl_cb_set(cb_, type, kind, func, arg); |
| 84 | if (result) { |
| 85 | LOG(ERROR) << "nl_cb_set returned " << result; |
| 86 | return false; |
| 87 | } |
| 88 | return true; |
| 89 | } |
| 90 | |
| 91 | // |
| 92 | // NetlinkSocket. |
| 93 | // |
| 94 | |
| 95 | NetlinkSocket::~NetlinkSocket() { |
| 96 | if (nl_sock_) { |
| 97 | nl_socket_free(nl_sock_); |
| 98 | nl_sock_ = NULL; |
| 99 | } |
| 100 | } |
| 101 | |
| 102 | bool NetlinkSocket::Init() { |
| 103 | nl_sock_ = nl_socket_alloc(); |
| 104 | if (!nl_sock_) { |
| 105 | LOG(ERROR) << "Failed to allocate netlink socket."; |
| 106 | return false; |
| 107 | } |
| 108 | |
| 109 | if (genl_connect(nl_sock_)) { |
| 110 | LOG(ERROR) << "Failed to connect to generic netlink."; |
| 111 | return false; |
| 112 | } |
| 113 | |
| 114 | return true; |
| 115 | } |
| 116 | |
| 117 | bool NetlinkSocket::DisableSequenceChecking() { |
| 118 | if (!nl_sock_) { |
| 119 | LOG(ERROR) << "NULL socket"; |
| 120 | return false; |
| 121 | } |
| 122 | |
| 123 | // NOTE: can't use nl_socket_disable_seq_check(); it's not in this version |
| 124 | // of the library. |
| 125 | int result = nl_socket_modify_cb(nl_sock_, NL_CB_SEQ_CHECK, NL_CB_CUSTOM, |
| 126 | NetlinkSocket::IgnoreSequenceCheck, NULL); |
| 127 | if (result) { |
| 128 | LOG(ERROR) << "Failed call to nl_socket_modify_cb: " << result; |
| 129 | return false; |
| 130 | } |
| 131 | |
| 132 | return true; |
| 133 | } |
| 134 | |
| 135 | int NetlinkSocket::GetFd() const { |
| 136 | if (!nl_sock_) { |
| 137 | LOG(ERROR) << "NULL socket"; |
| 138 | return -1; |
| 139 | } |
| 140 | return nl_socket_get_fd(nl_sock_); |
| 141 | } |
| 142 | |
| 143 | bool NetlinkSocket::GetMessages() { |
| 144 | // TODO(wdg): make this non-blocking. |
| 145 | // Blocks until a message is available. When that happens, the message is |
| 146 | // read and passed to the default callback (i.e., the one set with |
| 147 | // NetlinkSocket::SetNetlinkCallback). |
| 148 | int result = nl_recvmsgs_default(nl_sock_); |
| 149 | if (result < 0) { |
Wade Guthrie | b1ec860 | 2012-10-18 17:26:14 -0700 | [diff] [blame] | 150 | LOG(ERROR) << "Failed call to nl_recvmsgs_default: " << strerror(-result) |
| 151 | << " (" << result << ")"; |
Wade Guthrie | 0d43853 | 2012-05-18 14:18:50 -0700 | [diff] [blame] | 152 | return false; |
| 153 | } |
| 154 | return true; |
| 155 | } |
| 156 | |
| 157 | bool NetlinkSocket::GetMessagesUsingCallback( |
| 158 | NetlinkSocket::Callback *on_netlink_data) { |
| 159 | if (!on_netlink_data || !on_netlink_data->cb_) |
| 160 | return GetMessages(); // Default to generic callback. |
| 161 | |
| 162 | int result = nl_recvmsgs(nl_sock_, on_netlink_data->cb_); |
| 163 | if (result < 0) { |
Wade Guthrie | b1ec860 | 2012-10-18 17:26:14 -0700 | [diff] [blame] | 164 | LOG(ERROR) << "Failed call to nl_recvmsgs: " << strerror(-result) |
| 165 | << " (" << result << ")"; |
Wade Guthrie | 0d43853 | 2012-05-18 14:18:50 -0700 | [diff] [blame] | 166 | return false; |
| 167 | } |
| 168 | return true; |
| 169 | } |
| 170 | |
Wade Guthrie | 5d3d6de | 2012-11-02 11:08:34 -0700 | [diff] [blame^] | 171 | unsigned int NetlinkSocket::GetSequenceNumber() { |
| 172 | unsigned int number = nl_socket_use_seq(nl_sock_); |
| 173 | if (number == 0) { |
| 174 | number = nl_socket_use_seq(nl_sock_); |
| 175 | } |
| 176 | if (number == 0) { |
| 177 | LOG(WARNING) << "Couldn't get non-zero sequence number"; |
| 178 | number = 1; |
| 179 | } |
| 180 | return number; |
| 181 | } |
| 182 | |
Wade Guthrie | 0d43853 | 2012-05-18 14:18:50 -0700 | [diff] [blame] | 183 | bool NetlinkSocket::SetNetlinkCallback(nl_recvmsg_msg_cb_t on_netlink_data, |
| 184 | void *callback_parameter) { |
| 185 | if (!nl_sock_) { |
| 186 | LOG(ERROR) << "NULL socket"; |
| 187 | return false; |
| 188 | } |
| 189 | |
| 190 | int result = nl_socket_modify_cb(nl_sock_, NL_CB_VALID, NL_CB_CUSTOM, |
| 191 | on_netlink_data, callback_parameter); |
| 192 | if (result) { |
Wade Guthrie | b1ec860 | 2012-10-18 17:26:14 -0700 | [diff] [blame] | 193 | LOG(ERROR) << "nl_socket_modify_cb returned " << strerror(-result) |
| 194 | << " (" << result << ")"; |
Wade Guthrie | 0d43853 | 2012-05-18 14:18:50 -0700 | [diff] [blame] | 195 | return false; |
| 196 | } |
| 197 | return true; |
| 198 | } |
| 199 | |
| 200 | int NetlinkSocket::IgnoreSequenceCheck(struct nl_msg *ignored_msg, |
| 201 | void *ignored_arg) { |
| 202 | return NL_OK; // Proceed. |
| 203 | } |
| 204 | |
| 205 | } // namespace shill. |