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<h1>lib/msg.c</h1> </div>
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<div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="comment">/*</span>
<a name="l00002"></a>00002 <span class="comment"> * lib/msg.c Netlink Messages Interface</span>
<a name="l00003"></a>00003 <span class="comment"> *</span>
<a name="l00004"></a>00004 <span class="comment"> * This library is free software; you can redistribute it and/or</span>
<a name="l00005"></a>00005 <span class="comment"> * modify it under the terms of the GNU Lesser General Public</span>
<a name="l00006"></a>00006 <span class="comment"> * License as published by the Free Software Foundation version 2.1</span>
<a name="l00007"></a>00007 <span class="comment"> * of the License.</span>
<a name="l00008"></a>00008 <span class="comment"> *</span>
<a name="l00009"></a>00009 <span class="comment"> * Copyright (c) 2003-2006 Thomas Graf <tgraf@suug.ch></span>
<a name="l00010"></a>00010 <span class="comment"> */</span>
<a name="l00011"></a>00011 <span class="comment"></span>
<a name="l00012"></a>00012 <span class="comment">/**</span>
<a name="l00013"></a>00013 <span class="comment"> * @ingroup nl</span>
<a name="l00014"></a>00014 <span class="comment"> * @defgroup msg Messages</span>
<a name="l00015"></a>00015 <span class="comment"> * Netlink Message Construction/Parsing Interface</span>
<a name="l00016"></a>00016 <span class="comment"> * </span>
<a name="l00017"></a>00017 <span class="comment"> * The following information is partly extracted from RFC3549</span>
<a name="l00018"></a>00018 <span class="comment"> * (ftp://ftp.rfc-editor.org/in-notes/rfc3549.txt)</span>
<a name="l00019"></a>00019 <span class="comment"> *</span>
<a name="l00020"></a>00020 <span class="comment"> * @par Message Format</span>
<a name="l00021"></a>00021 <span class="comment"> * Netlink messages consist of a byte stream with one or multiple</span>
<a name="l00022"></a>00022 <span class="comment"> * Netlink headers and an associated payload. If the payload is too big</span>
<a name="l00023"></a>00023 <span class="comment"> * to fit into a single message it, can be split over multiple Netlink</span>
<a name="l00024"></a>00024 <span class="comment"> * messages, collectively called a multipart message. For multipart</span>
<a name="l00025"></a>00025 <span class="comment"> * messages, the first and all following headers have the \c NLM_F_MULTI</span>
<a name="l00026"></a>00026 <span class="comment"> * Netlink header flag set, except for the last header which has the</span>
<a name="l00027"></a>00027 <span class="comment"> * Netlink header type \c NLMSG_DONE.</span>
<a name="l00028"></a>00028 <span class="comment"> *</span>
<a name="l00029"></a>00029 <span class="comment"> * @par</span>
<a name="l00030"></a>00030 <span class="comment"> * The Netlink message header (\link nlmsghdr struct nlmsghdr\endlink) is shown below.</span>
<a name="l00031"></a>00031 <span class="comment"> * @code </span>
<a name="l00032"></a>00032 <span class="comment"> * 0 1 2 3</span>
<a name="l00033"></a>00033 <span class="comment"> * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1</span>
<a name="l00034"></a>00034 <span class="comment"> * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+</span>
<a name="l00035"></a>00035 <span class="comment"> * | Length |</span>
<a name="l00036"></a>00036 <span class="comment"> * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+</span>
<a name="l00037"></a>00037 <span class="comment"> * | Type | Flags |</span>
<a name="l00038"></a>00038 <span class="comment"> * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+</span>
<a name="l00039"></a>00039 <span class="comment"> * | Sequence Number |</span>
<a name="l00040"></a>00040 <span class="comment"> * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+</span>
<a name="l00041"></a>00041 <span class="comment"> * | Process ID (PID) |</span>
<a name="l00042"></a>00042 <span class="comment"> * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+</span>
<a name="l00043"></a>00043 <span class="comment"> * @endcode</span>
<a name="l00044"></a>00044 <span class="comment"> *</span>
<a name="l00045"></a>00045 <span class="comment"> * @par</span>
<a name="l00046"></a>00046 <span class="comment"> * The netlink message header and payload must be aligned properly:</span>
<a name="l00047"></a>00047 <span class="comment"> * @code</span>
<a name="l00048"></a>00048 <span class="comment"> * <------- NLMSG_ALIGN(hlen) ------> <---- NLMSG_ALIGN(len) ---></span>
<a name="l00049"></a>00049 <span class="comment"> * +----------------------------+- - -+- - - - - - - - - - -+- - -+</span>
<a name="l00050"></a>00050 <span class="comment"> * | Header | Pad | Payload | Pad |</span>
<a name="l00051"></a>00051 <span class="comment"> * | struct nlmsghdr | | | |</span>
<a name="l00052"></a>00052 <span class="comment"> * +----------------------------+- - -+- - - - - - - - - - -+- - -+</span>
<a name="l00053"></a>00053 <span class="comment"> * @endcode</span>
<a name="l00054"></a>00054 <span class="comment"> * @par</span>
<a name="l00055"></a>00055 <span class="comment"> * Message Format:</span>
<a name="l00056"></a>00056 <span class="comment"> * @code</span>
<a name="l00057"></a>00057 <span class="comment"> * <--- nlmsg_total_size(payload) ---></span>
<a name="l00058"></a>00058 <span class="comment"> * <-- nlmsg_msg_size(payload) -></span>
<a name="l00059"></a>00059 <span class="comment"> * +----------+- - -+-------------+- - -+-------- - -</span>
<a name="l00060"></a>00060 <span class="comment"> * | nlmsghdr | Pad | Payload | Pad | nlmsghdr</span>
<a name="l00061"></a>00061 <span class="comment"> * +----------+- - -+-------------+- - -+-------- - -</span>
<a name="l00062"></a>00062 <span class="comment"> * nlmsg_data(nlh)---^ ^</span>
<a name="l00063"></a>00063 <span class="comment"> * nlmsg_next(nlh)-----------------------+</span>
<a name="l00064"></a>00064 <span class="comment"> * @endcode</span>
<a name="l00065"></a>00065 <span class="comment"> * @par</span>
<a name="l00066"></a>00066 <span class="comment"> * The payload may consist of arbitary data but may have strict</span>
<a name="l00067"></a>00067 <span class="comment"> * alignment and formatting rules depening on the specific netlink</span>
<a name="l00068"></a>00068 <span class="comment"> * families.</span>
<a name="l00069"></a>00069 <span class="comment"> * @par</span>
<a name="l00070"></a>00070 <span class="comment"> * @code</span>
<a name="l00071"></a>00071 <span class="comment"> * <---------------------- nlmsg_len(nlh) ---------------------></span>
<a name="l00072"></a>00072 <span class="comment"> * <------ hdrlen ------> <- nlmsg_attrlen(nlh, hdrlen) -></span>
<a name="l00073"></a>00073 <span class="comment"> * +----------------------+- - -+--------------------------------+</span>
<a name="l00074"></a>00074 <span class="comment"> * | Family Header | Pad | Attributes |</span>
<a name="l00075"></a>00075 <span class="comment"> * +----------------------+- - -+--------------------------------+</span>
<a name="l00076"></a>00076 <span class="comment"> * nlmsg_attrdata(nlh, hdrlen)---^</span>
<a name="l00077"></a>00077 <span class="comment"> * @endcode</span>
<a name="l00078"></a>00078 <span class="comment"> * @par The ACK Netlink Message</span>
<a name="l00079"></a>00079 <span class="comment"> * This message is actually used to denote both an ACK and a NACK.</span>
<a name="l00080"></a>00080 <span class="comment"> * Typically, the direction is from FEC to CPC (in response to an ACK</span>
<a name="l00081"></a>00081 <span class="comment"> * request message). However, the CPC should be able to send ACKs back</span>
<a name="l00082"></a>00082 <span class="comment"> * to FEC when requested.</span>
<a name="l00083"></a>00083 <span class="comment"> * @code</span>
<a name="l00084"></a>00084 <span class="comment"> * 0 1 2 3</span>
<a name="l00085"></a>00085 <span class="comment"> * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1</span>
<a name="l00086"></a>00086 <span class="comment"> * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+</span>
<a name="l00087"></a>00087 <span class="comment"> * | Netlink message header |</span>
<a name="l00088"></a>00088 <span class="comment"> * | type = NLMSG_ERROR |</span>
<a name="l00089"></a>00089 <span class="comment"> * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+</span>
<a name="l00090"></a>00090 <span class="comment"> * | Error code |</span>
<a name="l00091"></a>00091 <span class="comment"> * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+</span>
<a name="l00092"></a>00092 <span class="comment"> * | OLD Netlink message header |</span>
<a name="l00093"></a>00093 <span class="comment"> * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+</span>
<a name="l00094"></a>00094 <span class="comment"> * @endcode</span>
<a name="l00095"></a>00095 <span class="comment"> *</span>
<a name="l00096"></a>00096 <span class="comment"> * @par Example</span>
<a name="l00097"></a>00097 <span class="comment"> * @code</span>
<a name="l00098"></a>00098 <span class="comment"> * // Various methods exist to create/allocate a new netlink</span>
<a name="l00099"></a>00099 <span class="comment"> * // message. </span>
<a name="l00100"></a>00100 <span class="comment"> * //</span>
<a name="l00101"></a>00101 <span class="comment"> * // nlmsg_alloc() will allocate an empty netlink message with</span>
<a name="l00102"></a>00102 <span class="comment"> * // a maximum payload size which defaults to the page size of</span>
<a name="l00103"></a>00103 <span class="comment"> * // the system. This default size can be modified using the</span>
<a name="l00104"></a>00104 <span class="comment"> * // function nlmsg_set_default_size().</span>
<a name="l00105"></a>00105 <span class="comment"> * struct nl_msg *msg = nlmsg_alloc();</span>
<a name="l00106"></a>00106 <span class="comment"> *</span>
<a name="l00107"></a>00107 <span class="comment"> * // Very often, the message type and message flags are known</span>
<a name="l00108"></a>00108 <span class="comment"> * // at allocation time while the other fields are auto generated:</span>
<a name="l00109"></a>00109 <span class="comment"> * struct nl_msg *msg = nlmsg_alloc_simple(MY_TYPE, MY_FLAGS);</span>
<a name="l00110"></a>00110 <span class="comment"> *</span>
<a name="l00111"></a>00111 <span class="comment"> * // Alternatively an existing netlink message header can be used</span>
<a name="l00112"></a>00112 <span class="comment"> * // to inherit the header values:</span>
<a name="l00113"></a>00113 <span class="comment"> * struct nlmsghdr hdr = {</span>
<a name="l00114"></a>00114 <span class="comment"> * .nlmsg_type = MY_TYPE,</span>
<a name="l00115"></a>00115 <span class="comment"> * .nlmsg_flags = MY_FLAGS,</span>
<a name="l00116"></a>00116 <span class="comment"> * };</span>
<a name="l00117"></a>00117 <span class="comment"> * struct nl_msg *msg = nlmsg_inherit(&hdr);</span>
<a name="l00118"></a>00118 <span class="comment"> *</span>
<a name="l00119"></a>00119 <span class="comment"> * // Last but not least, netlink messages received from netlink sockets</span>
<a name="l00120"></a>00120 <span class="comment"> * // can be converted into nl_msg objects using nlmsg_convert(). This</span>
<a name="l00121"></a>00121 <span class="comment"> * // will create a message with a maximum payload size which equals the</span>
<a name="l00122"></a>00122 <span class="comment"> * // length of the existing netlink message, therefore no more data can</span>
<a name="l00123"></a>00123 <span class="comment"> * // be appened without calling nlmsg_expand() first.</span>
<a name="l00124"></a>00124 <span class="comment"> * struct nl_msg *msg = nlmsg_convert(nlh_from_nl_sock);</span>
<a name="l00125"></a>00125 <span class="comment"> *</span>
<a name="l00126"></a>00126 <span class="comment"> * // Payload may be added to the message via nlmsg_append(). The fourth</span>
<a name="l00127"></a>00127 <span class="comment"> * // parameter specifies the number of alignment bytes the data should</span>
<a name="l00128"></a>00128 <span class="comment"> * // be padding with at the end. Common values are 0 to disable it or</span>
<a name="l00129"></a>00129 <span class="comment"> * // NLMSG_ALIGNTO to ensure proper netlink message padding.</span>
<a name="l00130"></a>00130 <span class="comment"> * nlmsg_append(msg, &mydata, sizeof(mydata), 0);</span>
<a name="l00131"></a>00131 <span class="comment"> *</span>
<a name="l00132"></a>00132 <span class="comment"> * // Sometimes it may be necessary to reserve room for data but defer</span>
<a name="l00133"></a>00133 <span class="comment"> * // the actual copying to a later point, nlmsg_reserve() can be used</span>
<a name="l00134"></a>00134 <span class="comment"> * // for this purpose:</span>
<a name="l00135"></a>00135 <span class="comment"> * void *data = nlmsg_reserve(msg, sizeof(mydata), NLMSG_ALIGNTO);</span>
<a name="l00136"></a>00136 <span class="comment"> *</span>
<a name="l00137"></a>00137 <span class="comment"> * // Attributes may be added using the attributes interface.</span>
<a name="l00138"></a>00138 <span class="comment"> *</span>
<a name="l00139"></a>00139 <span class="comment"> * // After successful use of the message, the memory must be freed</span>
<a name="l00140"></a>00140 <span class="comment"> * // using nlmsg_free()</span>
<a name="l00141"></a>00141 <span class="comment"> * nlmsg_free(msg);</span>
<a name="l00142"></a>00142 <span class="comment"> * @endcode</span>
<a name="l00143"></a>00143 <span class="comment"> * </span>
<a name="l00144"></a>00144 <span class="comment"> * @par 4) Parsing messages</span>
<a name="l00145"></a>00145 <span class="comment"> * @code</span>
<a name="l00146"></a>00146 <span class="comment"> * int n;</span>
<a name="l00147"></a>00147 <span class="comment"> * unsigned char *buf;</span>
<a name="l00148"></a>00148 <span class="comment"> * struct nlmsghdr *hdr;</span>
<a name="l00149"></a>00149 <span class="comment"> *</span>
<a name="l00150"></a>00150 <span class="comment"> * n = nl_recv(handle, NULL, &buf);</span>
<a name="l00151"></a>00151 <span class="comment"> * </span>
<a name="l00152"></a>00152 <span class="comment"> * hdr = (struct nlmsghdr *) buf;</span>
<a name="l00153"></a>00153 <span class="comment"> * while (nlmsg_ok(hdr, n)) {</span>
<a name="l00154"></a>00154 <span class="comment"> * // Process message here...</span>
<a name="l00155"></a>00155 <span class="comment"> * hdr = nlmsg_next(hdr, &n);</span>
<a name="l00156"></a>00156 <span class="comment"> * }</span>
<a name="l00157"></a>00157 <span class="comment"> * @endcode</span>
<a name="l00158"></a>00158 <span class="comment"> * @{</span>
<a name="l00159"></a>00159 <span class="comment"> */</span>
<a name="l00160"></a>00160
<a name="l00161"></a>00161 <span class="preprocessor">#include <netlink-local.h></span>
<a name="l00162"></a>00162 <span class="preprocessor">#include <netlink/netlink.h></span>
<a name="l00163"></a>00163 <span class="preprocessor">#include <netlink/utils.h></span>
<a name="l00164"></a>00164 <span class="preprocessor">#include <netlink/cache.h></span>
<a name="l00165"></a>00165 <span class="preprocessor">#include <netlink/attr.h></span>
<a name="l00166"></a>00166 <span class="preprocessor">#include <linux/socket.h></span>
<a name="l00167"></a>00167
<a name="l00168"></a>00168 <span class="keyword">static</span> <span class="keywordtype">size_t</span> default_msg_size;
<a name="l00169"></a>00169
<a name="l00170"></a>00170 <span class="keyword">static</span> <span class="keywordtype">void</span> __init init_msg_size(<span class="keywordtype">void</span>)
<a name="l00171"></a>00171 {
<a name="l00172"></a>00172 default_msg_size = getpagesize();
<a name="l00173"></a>00173 }
<a name="l00174"></a>00174 <span class="comment"></span>
<a name="l00175"></a>00175 <span class="comment">/**</span>
<a name="l00176"></a>00176 <span class="comment"> * @name Size Calculations</span>
<a name="l00177"></a>00177 <span class="comment"> * @{</span>
<a name="l00178"></a>00178 <span class="comment"> */</span>
<a name="l00179"></a>00179 <span class="comment"></span>
<a name="l00180"></a>00180 <span class="comment">/**</span>
<a name="l00181"></a>00181 <span class="comment"> * length of netlink message not including padding</span>
<a name="l00182"></a>00182 <span class="comment"> * @arg payload length of message payload</span>
<a name="l00183"></a>00183 <span class="comment"> */</span>
<a name="l00184"></a><a class="code" href="group__msg.html#ga3790ddfe9268d3b63f3cd1ceb9bb2f83">00184</a> <span class="keywordtype">int</span> <a class="code" href="group__msg.html#ga3790ddfe9268d3b63f3cd1ceb9bb2f83" title="length of netlink message not including padding">nlmsg_msg_size</a>(<span class="keywordtype">int</span> payload)
<a name="l00185"></a>00185 {
<a name="l00186"></a>00186 <span class="keywordflow">return</span> NLMSG_HDRLEN + payload;
<a name="l00187"></a>00187 }
<a name="l00188"></a>00188 <span class="comment"></span>
<a name="l00189"></a>00189 <span class="comment">/**</span>
<a name="l00190"></a>00190 <span class="comment"> * length of netlink message including padding</span>
<a name="l00191"></a>00191 <span class="comment"> * @arg payload length of message payload</span>
<a name="l00192"></a>00192 <span class="comment"> */</span>
<a name="l00193"></a><a class="code" href="group__msg.html#ga0734c5b291e451c26051ad3b6ef083bd">00193</a> <span class="keywordtype">int</span> <a class="code" href="group__msg.html#ga0734c5b291e451c26051ad3b6ef083bd" title="length of netlink message including padding">nlmsg_total_size</a>(<span class="keywordtype">int</span> payload)
<a name="l00194"></a>00194 {
<a name="l00195"></a>00195 <span class="keywordflow">return</span> NLMSG_ALIGN(<a class="code" href="group__msg.html#ga3790ddfe9268d3b63f3cd1ceb9bb2f83" title="length of netlink message not including padding">nlmsg_msg_size</a>(payload));
<a name="l00196"></a>00196 }
<a name="l00197"></a>00197 <span class="comment"></span>
<a name="l00198"></a>00198 <span class="comment">/**</span>
<a name="l00199"></a>00199 <span class="comment"> * length of padding at the message's tail</span>
<a name="l00200"></a>00200 <span class="comment"> * @arg payload length of message payload</span>
<a name="l00201"></a>00201 <span class="comment"> */</span>
<a name="l00202"></a><a class="code" href="group__msg.html#gad47e979aa22aca4b8eb1c90234dea678">00202</a> <span class="keywordtype">int</span> <a class="code" href="group__msg.html#gad47e979aa22aca4b8eb1c90234dea678" title="length of padding at the message&#39;s tail">nlmsg_padlen</a>(<span class="keywordtype">int</span> payload)
<a name="l00203"></a>00203 {
<a name="l00204"></a>00204 <span class="keywordflow">return</span> <a class="code" href="group__msg.html#ga0734c5b291e451c26051ad3b6ef083bd" title="length of netlink message including padding">nlmsg_total_size</a>(payload) - <a class="code" href="group__msg.html#ga3790ddfe9268d3b63f3cd1ceb9bb2f83" title="length of netlink message not including padding">nlmsg_msg_size</a>(payload);
<a name="l00205"></a>00205 }
<a name="l00206"></a>00206 <span class="comment"></span>
<a name="l00207"></a>00207 <span class="comment">/** @} */</span>
<a name="l00208"></a>00208 <span class="comment"></span>
<a name="l00209"></a>00209 <span class="comment">/**</span>
<a name="l00210"></a>00210 <span class="comment"> * @name Payload Access</span>
<a name="l00211"></a>00211 <span class="comment"> * @{</span>
<a name="l00212"></a>00212 <span class="comment"> */</span>
<a name="l00213"></a>00213 <span class="comment"></span>
<a name="l00214"></a>00214 <span class="comment">/**</span>
<a name="l00215"></a>00215 <span class="comment"> * head of message payload</span>
<a name="l00216"></a>00216 <span class="comment"> * @arg nlh netlink messsage header</span>
<a name="l00217"></a>00217 <span class="comment"> */</span>
<a name="l00218"></a><a class="code" href="group__msg.html#gae44a904bb40c8b5f5ff31539c21cfa5a">00218</a> <span class="keywordtype">void</span> *<a class="code" href="group__msg.html#gae44a904bb40c8b5f5ff31539c21cfa5a" title="head of message payload">nlmsg_data</a>(<span class="keyword">const</span> <span class="keyword">struct</span> <a class="code" href="structnlmsghdr.html" title="Netlink message header.">nlmsghdr</a> *nlh)
<a name="l00219"></a>00219 {
<a name="l00220"></a>00220 <span class="keywordflow">return</span> (<span class="keywordtype">unsigned</span> <span class="keywordtype">char</span> *) nlh + NLMSG_HDRLEN;
<a name="l00221"></a>00221 }
<a name="l00222"></a>00222
<a name="l00223"></a>00223 <span class="keywordtype">void</span> *nlmsg_tail(<span class="keyword">const</span> <span class="keyword">struct</span> <a class="code" href="structnlmsghdr.html" title="Netlink message header.">nlmsghdr</a> *nlh)
<a name="l00224"></a>00224 {
<a name="l00225"></a>00225 <span class="keywordflow">return</span> (<span class="keywordtype">unsigned</span> <span class="keywordtype">char</span> *) nlh + NLMSG_ALIGN(nlh-><a class="code" href="structnlmsghdr.html#a5a3fdb3436743ec73e75471c899fd4bc" title="Length of message including header.">nlmsg_len</a>);
<a name="l00226"></a>00226 }
<a name="l00227"></a>00227 <span class="comment"></span>
<a name="l00228"></a>00228 <span class="comment">/**</span>
<a name="l00229"></a>00229 <span class="comment"> * length of message payload</span>
<a name="l00230"></a>00230 <span class="comment"> * @arg nlh netlink message header</span>
<a name="l00231"></a>00231 <span class="comment"> */</span>
<a name="l00232"></a><a class="code" href="group__msg.html#gafa0898e9ec7d59a8faa1e4f0ed3168bf">00232</a> <span class="keywordtype">int</span> <a class="code" href="group__msg.html#gafa0898e9ec7d59a8faa1e4f0ed3168bf" title="length of message payload">nlmsg_len</a>(<span class="keyword">const</span> <span class="keyword">struct</span> <a class="code" href="structnlmsghdr.html" title="Netlink message header.">nlmsghdr</a> *nlh)
<a name="l00233"></a>00233 {
<a name="l00234"></a>00234 <span class="keywordflow">return</span> nlh-><a class="code" href="structnlmsghdr.html#a5a3fdb3436743ec73e75471c899fd4bc" title="Length of message including header.">nlmsg_len</a> - NLMSG_HDRLEN;
<a name="l00235"></a>00235 }
<a name="l00236"></a>00236 <span class="comment"></span>
<a name="l00237"></a>00237 <span class="comment">/** @} */</span>
<a name="l00238"></a>00238 <span class="comment"></span>
<a name="l00239"></a>00239 <span class="comment">/**</span>
<a name="l00240"></a>00240 <span class="comment"> * @name Attribute Access</span>
<a name="l00241"></a>00241 <span class="comment"> * @{</span>
<a name="l00242"></a>00242 <span class="comment"> */</span>
<a name="l00243"></a>00243 <span class="comment"></span>
<a name="l00244"></a>00244 <span class="comment">/**</span>
<a name="l00245"></a>00245 <span class="comment"> * head of attributes data</span>
<a name="l00246"></a>00246 <span class="comment"> * @arg nlh netlink message header</span>
<a name="l00247"></a>00247 <span class="comment"> * @arg hdrlen length of family specific header</span>
<a name="l00248"></a>00248 <span class="comment"> */</span>
<a name="l00249"></a><a class="code" href="group__msg.html#ga203fdf0a4637e05df44de94c60d8e909">00249</a> <span class="keyword">struct </span>nlattr *<a class="code" href="group__msg.html#ga203fdf0a4637e05df44de94c60d8e909" title="head of attributes data">nlmsg_attrdata</a>(<span class="keyword">const</span> <span class="keyword">struct</span> <a class="code" href="structnlmsghdr.html" title="Netlink message header.">nlmsghdr</a> *nlh, <span class="keywordtype">int</span> hdrlen)
<a name="l00250"></a>00250 {
<a name="l00251"></a>00251 <span class="keywordtype">unsigned</span> <span class="keywordtype">char</span> *data = <a class="code" href="group__msg.html#gae44a904bb40c8b5f5ff31539c21cfa5a" title="head of message payload">nlmsg_data</a>(nlh);
<a name="l00252"></a>00252 <span class="keywordflow">return</span> (<span class="keyword">struct</span> nlattr *) (data + NLMSG_ALIGN(hdrlen));
<a name="l00253"></a>00253 }
<a name="l00254"></a>00254 <span class="comment"></span>
<a name="l00255"></a>00255 <span class="comment">/**</span>
<a name="l00256"></a>00256 <span class="comment"> * length of attributes data</span>
<a name="l00257"></a>00257 <span class="comment"> * @arg nlh netlink message header</span>
<a name="l00258"></a>00258 <span class="comment"> * @arg hdrlen length of family specific header</span>
<a name="l00259"></a>00259 <span class="comment"> */</span>
<a name="l00260"></a><a class="code" href="group__msg.html#gac9a4689d22aaa2f630476a7826f25fec">00260</a> <span class="keywordtype">int</span> <a class="code" href="group__msg.html#gac9a4689d22aaa2f630476a7826f25fec" title="length of attributes data">nlmsg_attrlen</a>(<span class="keyword">const</span> <span class="keyword">struct</span> <a class="code" href="structnlmsghdr.html" title="Netlink message header.">nlmsghdr</a> *nlh, <span class="keywordtype">int</span> hdrlen)
<a name="l00261"></a>00261 {
<a name="l00262"></a>00262 <span class="keywordflow">return</span> <a class="code" href="group__msg.html#gafa0898e9ec7d59a8faa1e4f0ed3168bf" title="length of message payload">nlmsg_len</a>(nlh) - NLMSG_ALIGN(hdrlen);
<a name="l00263"></a>00263 }
<a name="l00264"></a>00264 <span class="comment"></span>
<a name="l00265"></a>00265 <span class="comment">/** @} */</span>
<a name="l00266"></a>00266 <span class="comment"></span>
<a name="l00267"></a>00267 <span class="comment">/**</span>
<a name="l00268"></a>00268 <span class="comment"> * @name Message Parsing</span>
<a name="l00269"></a>00269 <span class="comment"> * @{</span>
<a name="l00270"></a>00270 <span class="comment"> */</span>
<a name="l00271"></a>00271
<a name="l00272"></a>00272 <span class="keywordtype">int</span> nlmsg_valid_hdr(<span class="keyword">const</span> <span class="keyword">struct</span> <a class="code" href="structnlmsghdr.html" title="Netlink message header.">nlmsghdr</a> *nlh, <span class="keywordtype">int</span> hdrlen)
<a name="l00273"></a>00273 {
<a name="l00274"></a>00274 <span class="keywordflow">if</span> (nlh-><a class="code" href="structnlmsghdr.html#a5a3fdb3436743ec73e75471c899fd4bc" title="Length of message including header.">nlmsg_len</a> < <a class="code" href="group__msg.html#ga3790ddfe9268d3b63f3cd1ceb9bb2f83" title="length of netlink message not including padding">nlmsg_msg_size</a>(hdrlen))
<a name="l00275"></a>00275 <span class="keywordflow">return</span> 0;
<a name="l00276"></a>00276
<a name="l00277"></a>00277 <span class="keywordflow">return</span> 1;
<a name="l00278"></a>00278 }
<a name="l00279"></a>00279 <span class="comment"></span>
<a name="l00280"></a>00280 <span class="comment">/**</span>
<a name="l00281"></a>00281 <span class="comment"> * check if the netlink message fits into the remaining bytes</span>
<a name="l00282"></a>00282 <span class="comment"> * @arg nlh netlink message header</span>
<a name="l00283"></a>00283 <span class="comment"> * @arg remaining number of bytes remaining in message stream</span>
<a name="l00284"></a>00284 <span class="comment"> */</span>
<a name="l00285"></a><a class="code" href="group__msg.html#ga0107484894e5be506c1e1bb6cb09dbe2">00285</a> <span class="keywordtype">int</span> <a class="code" href="group__msg.html#ga0107484894e5be506c1e1bb6cb09dbe2" title="check if the netlink message fits into the remaining bytes">nlmsg_ok</a>(<span class="keyword">const</span> <span class="keyword">struct</span> <a class="code" href="structnlmsghdr.html" title="Netlink message header.">nlmsghdr</a> *nlh, <span class="keywordtype">int</span> remaining)
<a name="l00286"></a>00286 {
<a name="l00287"></a>00287 <span class="keywordflow">return</span> (remaining >= <span class="keyword">sizeof</span>(<span class="keyword">struct</span> <a class="code" href="structnlmsghdr.html" title="Netlink message header.">nlmsghdr</a>) &&
<a name="l00288"></a>00288 nlh-><a class="code" href="structnlmsghdr.html#a5a3fdb3436743ec73e75471c899fd4bc" title="Length of message including header.">nlmsg_len</a> >= <span class="keyword">sizeof</span>(<span class="keyword">struct</span> <a class="code" href="structnlmsghdr.html" title="Netlink message header.">nlmsghdr</a>) &&
<a name="l00289"></a>00289 nlh-><a class="code" href="structnlmsghdr.html#a5a3fdb3436743ec73e75471c899fd4bc" title="Length of message including header.">nlmsg_len</a> <= remaining);
<a name="l00290"></a>00290 }
<a name="l00291"></a>00291 <span class="comment"></span>
<a name="l00292"></a>00292 <span class="comment">/**</span>
<a name="l00293"></a>00293 <span class="comment"> * next netlink message in message stream</span>
<a name="l00294"></a>00294 <span class="comment"> * @arg nlh netlink message header</span>
<a name="l00295"></a>00295 <span class="comment"> * @arg remaining number of bytes remaining in message stream</span>
<a name="l00296"></a>00296 <span class="comment"> *</span>
<a name="l00297"></a>00297 <span class="comment"> * @returns the next netlink message in the message stream and</span>
<a name="l00298"></a>00298 <span class="comment"> * decrements remaining by the size of the current message.</span>
<a name="l00299"></a>00299 <span class="comment"> */</span>
<a name="l00300"></a><a class="code" href="group__msg.html#gafae8cbad57755ac6d758f6073cb22134">00300</a> <span class="keyword">struct </span><a class="code" href="structnlmsghdr.html" title="Netlink message header.">nlmsghdr</a> *<a class="code" href="group__msg.html#gafae8cbad57755ac6d758f6073cb22134" title="next netlink message in message stream">nlmsg_next</a>(<span class="keyword">struct</span> <a class="code" href="structnlmsghdr.html" title="Netlink message header.">nlmsghdr</a> *nlh, <span class="keywordtype">int</span> *remaining)
<a name="l00301"></a>00301 {
<a name="l00302"></a>00302 <span class="keywordtype">int</span> totlen = NLMSG_ALIGN(nlh-><a class="code" href="structnlmsghdr.html#a5a3fdb3436743ec73e75471c899fd4bc" title="Length of message including header.">nlmsg_len</a>);
<a name="l00303"></a>00303
<a name="l00304"></a>00304 *remaining -= totlen;
<a name="l00305"></a>00305
<a name="l00306"></a>00306 <span class="keywordflow">return</span> (<span class="keyword">struct</span> <a class="code" href="structnlmsghdr.html" title="Netlink message header.">nlmsghdr</a> *) ((<span class="keywordtype">unsigned</span> <span class="keywordtype">char</span> *) nlh + totlen);
<a name="l00307"></a>00307 }
<a name="l00308"></a>00308 <span class="comment"></span>
<a name="l00309"></a>00309 <span class="comment">/**</span>
<a name="l00310"></a>00310 <span class="comment"> * parse attributes of a netlink message</span>
<a name="l00311"></a>00311 <span class="comment"> * @arg nlh netlink message header</span>
<a name="l00312"></a>00312 <span class="comment"> * @arg hdrlen length of family specific header</span>
<a name="l00313"></a>00313 <span class="comment"> * @arg tb destination array with maxtype+1 elements</span>
<a name="l00314"></a>00314 <span class="comment"> * @arg maxtype maximum attribute type to be expected</span>
<a name="l00315"></a>00315 <span class="comment"> * @arg policy validation policy</span>
<a name="l00316"></a>00316 <span class="comment"> *</span>
<a name="l00317"></a>00317 <span class="comment"> * See nla_parse()</span>
<a name="l00318"></a>00318 <span class="comment"> */</span>
<a name="l00319"></a><a class="code" href="group__msg.html#ga2671eefe95c3e44dec8ddab51ae57593">00319</a> <span class="keywordtype">int</span> <a class="code" href="group__msg.html#ga2671eefe95c3e44dec8ddab51ae57593" title="parse attributes of a netlink message">nlmsg_parse</a>(<span class="keyword">struct</span> <a class="code" href="structnlmsghdr.html" title="Netlink message header.">nlmsghdr</a> *nlh, <span class="keywordtype">int</span> hdrlen, <span class="keyword">struct</span> nlattr *tb[],
<a name="l00320"></a>00320 <span class="keywordtype">int</span> maxtype, <span class="keyword">struct</span> <a class="code" href="structnla__policy.html" title="attribute validation policy">nla_policy</a> *policy)
<a name="l00321"></a>00321 {
<a name="l00322"></a>00322 <span class="keywordflow">if</span> (!nlmsg_valid_hdr(nlh, hdrlen))
<a name="l00323"></a>00323 <span class="keywordflow">return</span> nl_errno(EINVAL);
<a name="l00324"></a>00324
<a name="l00325"></a>00325 <span class="keywordflow">return</span> <a class="code" href="group__attr.html#gaa7ad544b5a93034602a442eb26cda92c" title="Parse a stream of attributes into a tb buffer.">nla_parse</a>(tb, maxtype, <a class="code" href="group__msg.html#ga203fdf0a4637e05df44de94c60d8e909" title="head of attributes data">nlmsg_attrdata</a>(nlh, hdrlen),
<a name="l00326"></a>00326 <a class="code" href="group__msg.html#gac9a4689d22aaa2f630476a7826f25fec" title="length of attributes data">nlmsg_attrlen</a>(nlh, hdrlen), policy);
<a name="l00327"></a>00327 }
<a name="l00328"></a>00328 <span class="comment"></span>
<a name="l00329"></a>00329 <span class="comment">/**</span>
<a name="l00330"></a>00330 <span class="comment"> * nlmsg_find_attr - find a specific attribute in a netlink message</span>
<a name="l00331"></a>00331 <span class="comment"> * @arg nlh netlink message header</span>
<a name="l00332"></a>00332 <span class="comment"> * @arg hdrlen length of familiy specific header</span>
<a name="l00333"></a>00333 <span class="comment"> * @arg attrtype type of attribute to look for</span>
<a name="l00334"></a>00334 <span class="comment"> *</span>
<a name="l00335"></a>00335 <span class="comment"> * Returns the first attribute which matches the specified type.</span>
<a name="l00336"></a>00336 <span class="comment"> */</span>
<a name="l00337"></a><a class="code" href="group__msg.html#gafd0b61236f262b7cc720b1edd01458b4">00337</a> <span class="keyword">struct </span>nlattr *<a class="code" href="group__msg.html#gafd0b61236f262b7cc720b1edd01458b4" title="nlmsg_find_attr - find a specific attribute in a netlink message">nlmsg_find_attr</a>(<span class="keyword">struct</span> <a class="code" href="structnlmsghdr.html" title="Netlink message header.">nlmsghdr</a> *nlh, <span class="keywordtype">int</span> hdrlen, <span class="keywordtype">int</span> attrtype)
<a name="l00338"></a>00338 {
<a name="l00339"></a>00339 <span class="keywordflow">return</span> <a class="code" href="group__attr.html#ga2e98df8c30030aebcfd1eebf11bbb22a" title="Find a specific attribute in a stream of attributes.">nla_find</a>(<a class="code" href="group__msg.html#ga203fdf0a4637e05df44de94c60d8e909" title="head of attributes data">nlmsg_attrdata</a>(nlh, hdrlen),
<a name="l00340"></a>00340 <a class="code" href="group__msg.html#gac9a4689d22aaa2f630476a7826f25fec" title="length of attributes data">nlmsg_attrlen</a>(nlh, hdrlen), attrtype);
<a name="l00341"></a>00341 }
<a name="l00342"></a>00342 <span class="comment"></span>
<a name="l00343"></a>00343 <span class="comment">/**</span>
<a name="l00344"></a>00344 <span class="comment"> * nlmsg_validate - validate a netlink message including attributes</span>
<a name="l00345"></a>00345 <span class="comment"> * @arg nlh netlinket message header</span>
<a name="l00346"></a>00346 <span class="comment"> * @arg hdrlen length of familiy specific header</span>
<a name="l00347"></a>00347 <span class="comment"> * @arg maxtype maximum attribute type to be expected</span>
<a name="l00348"></a>00348 <span class="comment"> * @arg policy validation policy</span>
<a name="l00349"></a>00349 <span class="comment"> */</span>
<a name="l00350"></a><a class="code" href="group__msg.html#gac488c8e2fcaefe96cadd33ebdc4a922f">00350</a> <span class="keywordtype">int</span> <a class="code" href="group__msg.html#gac488c8e2fcaefe96cadd33ebdc4a922f" title="nlmsg_validate - validate a netlink message including attributes">nlmsg_validate</a>(<span class="keyword">struct</span> <a class="code" href="structnlmsghdr.html" title="Netlink message header.">nlmsghdr</a> *nlh, <span class="keywordtype">int</span> hdrlen, <span class="keywordtype">int</span> maxtype,
<a name="l00351"></a>00351 <span class="keyword">struct</span> <a class="code" href="structnla__policy.html" title="attribute validation policy">nla_policy</a> *policy)
<a name="l00352"></a>00352 {
<a name="l00353"></a>00353 <span class="keywordflow">if</span> (!nlmsg_valid_hdr(nlh, hdrlen))
<a name="l00354"></a>00354 <span class="keywordflow">return</span> nl_errno(EINVAL);
<a name="l00355"></a>00355
<a name="l00356"></a>00356 <span class="keywordflow">return</span> <a class="code" href="group__attr.html#ga5d8d5930b012e61c8d8e4ba6b3038c36" title="Validate a stream of attributes.">nla_validate</a>(<a class="code" href="group__msg.html#ga203fdf0a4637e05df44de94c60d8e909" title="head of attributes data">nlmsg_attrdata</a>(nlh, hdrlen),
<a name="l00357"></a>00357 <a class="code" href="group__msg.html#gac9a4689d22aaa2f630476a7826f25fec" title="length of attributes data">nlmsg_attrlen</a>(nlh, hdrlen), maxtype, policy);
<a name="l00358"></a>00358 }
<a name="l00359"></a>00359 <span class="comment"></span>
<a name="l00360"></a>00360 <span class="comment">/** @} */</span>
<a name="l00361"></a>00361 <span class="comment"></span>
<a name="l00362"></a>00362 <span class="comment">/**</span>
<a name="l00363"></a>00363 <span class="comment"> * @name Message Building/Access</span>
<a name="l00364"></a>00364 <span class="comment"> * @{</span>
<a name="l00365"></a>00365 <span class="comment"> */</span>
<a name="l00366"></a>00366
<a name="l00367"></a>00367 <span class="keyword">static</span> <span class="keyword">struct </span>nl_msg *__nlmsg_alloc(<span class="keywordtype">size_t</span> len)
<a name="l00368"></a>00368 {
<a name="l00369"></a>00369 <span class="keyword">struct </span>nl_msg *nm;
<a name="l00370"></a>00370
<a name="l00371"></a>00371 nm = calloc(1, <span class="keyword">sizeof</span>(*nm));
<a name="l00372"></a>00372 <span class="keywordflow">if</span> (!nm)
<a name="l00373"></a>00373 <span class="keywordflow">goto</span> errout;
<a name="l00374"></a>00374
<a name="l00375"></a>00375 nm->nm_nlh = calloc(1, len);
<a name="l00376"></a>00376 <span class="keywordflow">if</span> (!nm->nm_nlh)
<a name="l00377"></a>00377 <span class="keywordflow">goto</span> errout;
<a name="l00378"></a>00378
<a name="l00379"></a>00379 nm->nm_protocol = -1;
<a name="l00380"></a>00380 nm->nm_size = len;
<a name="l00381"></a>00381 nm->nm_nlh->nlmsg_len = <a class="code" href="group__msg.html#ga0734c5b291e451c26051ad3b6ef083bd" title="length of netlink message including padding">nlmsg_total_size</a>(0);
<a name="l00382"></a>00382
<a name="l00383"></a>00383 NL_DBG(2, <span class="stringliteral">"msg %p: Allocated new message, maxlen=%zu\n"</span>, nm, len);
<a name="l00384"></a>00384
<a name="l00385"></a>00385 <span class="keywordflow">return</span> nm;
<a name="l00386"></a>00386 errout:
<a name="l00387"></a>00387 free(nm);
<a name="l00388"></a>00388 nl_errno(ENOMEM);
<a name="l00389"></a>00389 <span class="keywordflow">return</span> NULL;
<a name="l00390"></a>00390 }
<a name="l00391"></a>00391 <span class="comment"></span>
<a name="l00392"></a>00392 <span class="comment">/**</span>
<a name="l00393"></a>00393 <span class="comment"> * Allocate a new netlink message with the default maximum payload size.</span>
<a name="l00394"></a>00394 <span class="comment"> *</span>
<a name="l00395"></a>00395 <span class="comment"> * Allocates a new netlink message without any further payload. The</span>
<a name="l00396"></a>00396 <span class="comment"> * maximum payload size defaults to PAGESIZE or as otherwise specified</span>
<a name="l00397"></a>00397 <span class="comment"> * with nlmsg_set_default_size().</span>
<a name="l00398"></a>00398 <span class="comment"> *</span>
<a name="l00399"></a>00399 <span class="comment"> * @return Newly allocated netlink message or NULL.</span>
<a name="l00400"></a>00400 <span class="comment"> */</span>
<a name="l00401"></a><a class="code" href="group__msg.html#ga89c936bdf5e73455bb1640a0eb8a020d">00401</a> <span class="keyword">struct </span>nl_msg *<a class="code" href="group__msg.html#ga89c936bdf5e73455bb1640a0eb8a020d" title="Allocate a new netlink message with the default maximum payload size.">nlmsg_alloc</a>(<span class="keywordtype">void</span>)
<a name="l00402"></a>00402 {
<a name="l00403"></a>00403 <span class="keywordflow">return</span> __nlmsg_alloc(default_msg_size);
<a name="l00404"></a>00404 }
<a name="l00405"></a>00405 <span class="comment"></span>
<a name="l00406"></a>00406 <span class="comment">/**</span>
<a name="l00407"></a>00407 <span class="comment"> * Allocate a new netlink message with maximum payload size specified.</span>
<a name="l00408"></a>00408 <span class="comment"> */</span>
<a name="l00409"></a><a class="code" href="group__msg.html#ga0d879daa3a3a7d53fbafe0d7d72a3994">00409</a> <span class="keyword">struct </span>nl_msg *<a class="code" href="group__msg.html#ga0d879daa3a3a7d53fbafe0d7d72a3994" title="Allocate a new netlink message with maximum payload size specified.">nlmsg_alloc_size</a>(<span class="keywordtype">size_t</span> max)
<a name="l00410"></a>00410 {
<a name="l00411"></a>00411 <span class="keywordflow">return</span> __nlmsg_alloc(max);
<a name="l00412"></a>00412 }
<a name="l00413"></a>00413 <span class="comment"></span>
<a name="l00414"></a>00414 <span class="comment">/**</span>
<a name="l00415"></a>00415 <span class="comment"> * Allocate a new netlink message and inherit netlink message header</span>
<a name="l00416"></a>00416 <span class="comment"> * @arg hdr Netlink message header template</span>
<a name="l00417"></a>00417 <span class="comment"> *</span>
<a name="l00418"></a>00418 <span class="comment"> * Allocates a new netlink message and inherits the original message</span>
<a name="l00419"></a>00419 <span class="comment"> * header. If \a hdr is not NULL it will be used as a template for</span>
<a name="l00420"></a>00420 <span class="comment"> * the netlink message header, otherwise the header is left blank.</span>
<a name="l00421"></a>00421 <span class="comment"> * </span>
<a name="l00422"></a>00422 <span class="comment"> * @return Newly allocated netlink message or NULL</span>
<a name="l00423"></a>00423 <span class="comment"> */</span>
<a name="l00424"></a><a class="code" href="group__msg.html#gab89e1b4e969a091fed4ef851f3339756">00424</a> <span class="keyword">struct </span>nl_msg *<a class="code" href="group__msg.html#gab89e1b4e969a091fed4ef851f3339756" title="Allocate a new netlink message and inherit netlink message header.">nlmsg_inherit</a>(<span class="keyword">struct</span> <a class="code" href="structnlmsghdr.html" title="Netlink message header.">nlmsghdr</a> *hdr)
<a name="l00425"></a>00425 {
<a name="l00426"></a>00426 <span class="keyword">struct </span>nl_msg *nm;
<a name="l00427"></a>00427
<a name="l00428"></a>00428 nm = <a class="code" href="group__msg.html#ga89c936bdf5e73455bb1640a0eb8a020d" title="Allocate a new netlink message with the default maximum payload size.">nlmsg_alloc</a>();
<a name="l00429"></a>00429 <span class="keywordflow">if</span> (nm && hdr) {
<a name="l00430"></a>00430 <span class="keyword">struct </span><a class="code" href="structnlmsghdr.html" title="Netlink message header.">nlmsghdr</a> *<span class="keyword">new</span> = nm->nm_nlh;
<a name="l00431"></a>00431
<a name="l00432"></a>00432 <span class="keyword">new</span>-><a class="code" href="structnlmsghdr.html#a7232c4e6cb513010e64887b7eebf8823" title="Message type (content type)">nlmsg_type</a> = hdr-><a class="code" href="structnlmsghdr.html#a7232c4e6cb513010e64887b7eebf8823" title="Message type (content type)">nlmsg_type</a>;
<a name="l00433"></a>00433 <span class="keyword">new</span>->nlmsg_flags = hdr-><a class="code" href="structnlmsghdr.html#abcf664d354ea35ebb9b3d8a50088fec6" title="Message flags.">nlmsg_flags</a>;
<a name="l00434"></a>00434 <span class="keyword">new</span>->nlmsg_seq = hdr-><a class="code" href="structnlmsghdr.html#ad6c6a7aa9de65bb2da498c84148be7e6" title="Sequence number.">nlmsg_seq</a>;
<a name="l00435"></a>00435 <span class="keyword">new</span>->nlmsg_pid = hdr-><a class="code" href="structnlmsghdr.html#a071903f5e2400298bca69ac70500421f" title="Netlink PID of the proccess sending the message.">nlmsg_pid</a>;
<a name="l00436"></a>00436 }
<a name="l00437"></a>00437
<a name="l00438"></a>00438 <span class="keywordflow">return</span> nm;
<a name="l00439"></a>00439 }
<a name="l00440"></a>00440 <span class="comment"></span>
<a name="l00441"></a>00441 <span class="comment">/**</span>
<a name="l00442"></a>00442 <span class="comment"> * Allocate a new netlink message</span>
<a name="l00443"></a>00443 <span class="comment"> * @arg nlmsgtype Netlink message type</span>
<a name="l00444"></a>00444 <span class="comment"> * @arg flags Message flags.</span>
<a name="l00445"></a>00445 <span class="comment"> *</span>
<a name="l00446"></a>00446 <span class="comment"> * @return Newly allocated netlink message or NULL.</span>
<a name="l00447"></a>00447 <span class="comment"> */</span>
<a name="l00448"></a><a class="code" href="group__msg.html#ga580d8697d19050c55060bc10ab4eae9f">00448</a> <span class="keyword">struct </span>nl_msg *<a class="code" href="group__msg.html#ga580d8697d19050c55060bc10ab4eae9f" title="Allocate a new netlink message.">nlmsg_alloc_simple</a>(<span class="keywordtype">int</span> nlmsgtype, <span class="keywordtype">int</span> flags)
<a name="l00449"></a>00449 {
<a name="l00450"></a>00450 <span class="keyword">struct </span>nl_msg *msg;
<a name="l00451"></a>00451 <span class="keyword">struct </span><a class="code" href="structnlmsghdr.html" title="Netlink message header.">nlmsghdr</a> nlh = {
<a name="l00452"></a>00452 .<a class="code" href="structnlmsghdr.html#a7232c4e6cb513010e64887b7eebf8823" title="Message type (content type)">nlmsg_type</a> = nlmsgtype,
<a name="l00453"></a>00453 .nlmsg_flags = flags,
<a name="l00454"></a>00454 };
<a name="l00455"></a>00455
<a name="l00456"></a>00456 msg = <a class="code" href="group__msg.html#gab89e1b4e969a091fed4ef851f3339756" title="Allocate a new netlink message and inherit netlink message header.">nlmsg_inherit</a>(&nlh);
<a name="l00457"></a>00457 <span class="keywordflow">if</span> (msg)
<a name="l00458"></a>00458 NL_DBG(2, <span class="stringliteral">"msg %p: Allocated new simple message\n"</span>, msg);
<a name="l00459"></a>00459
<a name="l00460"></a>00460 <span class="keywordflow">return</span> msg;
<a name="l00461"></a>00461 }
<a name="l00462"></a>00462 <span class="comment"></span>
<a name="l00463"></a>00463 <span class="comment">/**</span>
<a name="l00464"></a>00464 <span class="comment"> * Set the default maximum message payload size for allocated messages</span>
<a name="l00465"></a>00465 <span class="comment"> * @arg max Size of payload in bytes.</span>
<a name="l00466"></a>00466 <span class="comment"> */</span>
<a name="l00467"></a><a class="code" href="group__msg.html#gaca38cf7b85baa19aad3cf33eff7e7a85">00467</a> <span class="keywordtype">void</span> <a class="code" href="group__msg.html#gaca38cf7b85baa19aad3cf33eff7e7a85" title="Set the default maximum message payload size for allocated messages.">nlmsg_set_default_size</a>(<span class="keywordtype">size_t</span> max)
<a name="l00468"></a>00468 {
<a name="l00469"></a>00469 <span class="keywordflow">if</span> (max < <a class="code" href="group__msg.html#ga0734c5b291e451c26051ad3b6ef083bd" title="length of netlink message including padding">nlmsg_total_size</a>(0))
<a name="l00470"></a>00470 max = <a class="code" href="group__msg.html#ga0734c5b291e451c26051ad3b6ef083bd" title="length of netlink message including padding">nlmsg_total_size</a>(0);
<a name="l00471"></a>00471
<a name="l00472"></a>00472 default_msg_size = max;
<a name="l00473"></a>00473 }
<a name="l00474"></a>00474 <span class="comment"></span>
<a name="l00475"></a>00475 <span class="comment">/**</span>
<a name="l00476"></a>00476 <span class="comment"> * Convert a netlink message received from a netlink socket to a nl_msg</span>
<a name="l00477"></a>00477 <span class="comment"> * @arg hdr Netlink message received from netlink socket.</span>
<a name="l00478"></a>00478 <span class="comment"> *</span>
<a name="l00479"></a>00479 <span class="comment"> * Allocates a new netlink message and copies all of the data pointed to</span>
<a name="l00480"></a>00480 <span class="comment"> * by \a hdr into the new message object.</span>
<a name="l00481"></a>00481 <span class="comment"> *</span>
<a name="l00482"></a>00482 <span class="comment"> * @return Newly allocated netlink message or NULL.</span>
<a name="l00483"></a>00483 <span class="comment"> */</span>
<a name="l00484"></a><a class="code" href="group__msg.html#ga2695036495d7127e610bc99fee5c9674">00484</a> <span class="keyword">struct </span>nl_msg *<a class="code" href="group__msg.html#ga2695036495d7127e610bc99fee5c9674" title="Convert a netlink message received from a netlink socket to a nl_msg.">nlmsg_convert</a>(<span class="keyword">struct</span> <a class="code" href="structnlmsghdr.html" title="Netlink message header.">nlmsghdr</a> *hdr)
<a name="l00485"></a>00485 {
<a name="l00486"></a>00486 <span class="keyword">struct </span>nl_msg *nm;
<a name="l00487"></a>00487
<a name="l00488"></a>00488 nm = __nlmsg_alloc(NLMSG_ALIGN(hdr-><a class="code" href="structnlmsghdr.html#a5a3fdb3436743ec73e75471c899fd4bc" title="Length of message including header.">nlmsg_len</a>));
<a name="l00489"></a>00489 <span class="keywordflow">if</span> (!nm)
<a name="l00490"></a>00490 <span class="keywordflow">goto</span> errout;
<a name="l00491"></a>00491
<a name="l00492"></a>00492 memcpy(nm->nm_nlh, hdr, hdr-><a class="code" href="structnlmsghdr.html#a5a3fdb3436743ec73e75471c899fd4bc" title="Length of message including header.">nlmsg_len</a>);
<a name="l00493"></a>00493
<a name="l00494"></a>00494 <span class="keywordflow">return</span> nm;
<a name="l00495"></a>00495 errout:
<a name="l00496"></a>00496 <a class="code" href="group__msg.html#ga138ba9bee70553f9fbe7143deacad48c" title="Free a netlink message.">nlmsg_free</a>(nm);
<a name="l00497"></a>00497 <span class="keywordflow">return</span> NULL;
<a name="l00498"></a>00498 }
<a name="l00499"></a>00499 <span class="comment"></span>
<a name="l00500"></a>00500 <span class="comment">/**</span>
<a name="l00501"></a>00501 <span class="comment"> * Reserve room for additional data in a netlink message</span>
<a name="l00502"></a>00502 <span class="comment"> * @arg n netlink message</span>
<a name="l00503"></a>00503 <span class="comment"> * @arg len length of additional data to reserve room for</span>
<a name="l00504"></a>00504 <span class="comment"> * @arg pad number of bytes to align data to</span>
<a name="l00505"></a>00505 <span class="comment"> *</span>
<a name="l00506"></a>00506 <span class="comment"> * Reserves room for additional data at the tail of the an</span>
<a name="l00507"></a>00507 <span class="comment"> * existing netlink message. Eventual padding required will</span>
<a name="l00508"></a>00508 <span class="comment"> * be zeroed out.</span>
<a name="l00509"></a>00509 <span class="comment"> *</span>
<a name="l00510"></a>00510 <span class="comment"> * @return Pointer to start of additional data tailroom or NULL.</span>
<a name="l00511"></a>00511 <span class="comment"> */</span>
<a name="l00512"></a><a class="code" href="group__msg.html#ga206eac17e0e75ae8457a513612395554">00512</a> <span class="keywordtype">void</span> *<a class="code" href="group__msg.html#ga206eac17e0e75ae8457a513612395554" title="Reserve room for additional data in a netlink message.">nlmsg_reserve</a>(<span class="keyword">struct</span> nl_msg *n, <span class="keywordtype">size_t</span> len, <span class="keywordtype">int</span> pad)
<a name="l00513"></a>00513 {
<a name="l00514"></a>00514 <span class="keywordtype">void</span> *buf = n->nm_nlh;
<a name="l00515"></a>00515 <span class="keywordtype">size_t</span> <a class="code" href="group__msg.html#gafa0898e9ec7d59a8faa1e4f0ed3168bf" title="length of message payload">nlmsg_len</a> = n->nm_nlh->nlmsg_len;
<a name="l00516"></a>00516 <span class="keywordtype">size_t</span> tlen;
<a name="l00517"></a>00517
<a name="l00518"></a>00518 tlen = pad ? ((len + (pad - 1)) & ~(pad - 1)) : len;
<a name="l00519"></a>00519
<a name="l00520"></a>00520 <span class="keywordflow">if</span> ((tlen + nlmsg_len) > n->nm_size) {
<a name="l00521"></a>00521 nl_errno(ENOBUFS);
<a name="l00522"></a>00522 <span class="keywordflow">return</span> NULL;
<a name="l00523"></a>00523 }
<a name="l00524"></a>00524
<a name="l00525"></a>00525 buf += <a class="code" href="group__msg.html#gafa0898e9ec7d59a8faa1e4f0ed3168bf" title="length of message payload">nlmsg_len</a>;
<a name="l00526"></a>00526 n->nm_nlh->nlmsg_len += tlen;
<a name="l00527"></a>00527
<a name="l00528"></a>00528 <span class="keywordflow">if</span> (tlen > len)
<a name="l00529"></a>00529 memset(buf + len, 0, tlen - len);
<a name="l00530"></a>00530
<a name="l00531"></a>00531 NL_DBG(2, <span class="stringliteral">"msg %p: Reserved %zu bytes, pad=%d, nlmsg_len=%d\n"</span>,
<a name="l00532"></a>00532 n, len, pad, n->nm_nlh->nlmsg_len);
<a name="l00533"></a>00533
<a name="l00534"></a>00534 <span class="keywordflow">return</span> buf;
<a name="l00535"></a>00535 }
<a name="l00536"></a>00536 <span class="comment"></span>
<a name="l00537"></a>00537 <span class="comment">/**</span>
<a name="l00538"></a>00538 <span class="comment"> * Append data to tail of a netlink message</span>
<a name="l00539"></a>00539 <span class="comment"> * @arg n netlink message</span>
<a name="l00540"></a>00540 <span class="comment"> * @arg data data to add</span>
<a name="l00541"></a>00541 <span class="comment"> * @arg len length of data</span>
<a name="l00542"></a>00542 <span class="comment"> * @arg pad Number of bytes to align data to.</span>
<a name="l00543"></a>00543 <span class="comment"> *</span>
<a name="l00544"></a>00544 <span class="comment"> * Extends the netlink message as needed and appends the data of given</span>
<a name="l00545"></a>00545 <span class="comment"> * length to the message. </span>
<a name="l00546"></a>00546 <span class="comment"> *</span>
<a name="l00547"></a>00547 <span class="comment"> * @return 0 on success or a negative error code</span>
<a name="l00548"></a>00548 <span class="comment"> */</span>
<a name="l00549"></a><a class="code" href="group__msg.html#gacc5e5ade5675d041f86c7c8693f7088d">00549</a> <span class="keywordtype">int</span> <a class="code" href="group__msg.html#gacc5e5ade5675d041f86c7c8693f7088d" title="Append data to tail of a netlink message.">nlmsg_append</a>(<span class="keyword">struct</span> nl_msg *n, <span class="keywordtype">void</span> *data, <span class="keywordtype">size_t</span> len, <span class="keywordtype">int</span> pad)
<a name="l00550"></a>00550 {
<a name="l00551"></a>00551 <span class="keywordtype">void</span> *tmp;
<a name="l00552"></a>00552
<a name="l00553"></a>00553 tmp = <a class="code" href="group__msg.html#ga206eac17e0e75ae8457a513612395554" title="Reserve room for additional data in a netlink message.">nlmsg_reserve</a>(n, len, pad);
<a name="l00554"></a>00554 <span class="keywordflow">if</span> (tmp == NULL)
<a name="l00555"></a>00555 <span class="keywordflow">return</span> nl_errno(ENOMEM);
<a name="l00556"></a>00556
<a name="l00557"></a>00557 memcpy(tmp, data, len);
<a name="l00558"></a>00558 NL_DBG(2, <span class="stringliteral">"msg %p: Appended %zu bytes with padding %d\n"</span>, n, len, pad);
<a name="l00559"></a>00559
<a name="l00560"></a>00560 <span class="keywordflow">return</span> 0;
<a name="l00561"></a>00561 }
<a name="l00562"></a>00562 <span class="comment"></span>
<a name="l00563"></a>00563 <span class="comment">/**</span>
<a name="l00564"></a>00564 <span class="comment"> * Expand maximum payload size of a netlink message</span>
<a name="l00565"></a>00565 <span class="comment"> * @arg n Netlink message.</span>
<a name="l00566"></a>00566 <span class="comment"> * @arg newlen New maximum payload size.</span>
<a name="l00567"></a>00567 <span class="comment"> *</span>
<a name="l00568"></a>00568 <span class="comment"> * Reallocates the payload section of a netlink message and increases</span>
<a name="l00569"></a>00569 <span class="comment"> * the maximum payload size of the message.</span>
<a name="l00570"></a>00570 <span class="comment"> *</span>
<a name="l00571"></a>00571 <span class="comment"> * @note Any pointers pointing to old payload block will be stale and</span>
<a name="l00572"></a>00572 <span class="comment"> * need to be refetched. Therfore, do not expand while constructing</span>
<a name="l00573"></a>00573 <span class="comment"> * nested attributes or while reserved data blocks are held.</span>
<a name="l00574"></a>00574 <span class="comment"> *</span>
<a name="l00575"></a>00575 <span class="comment"> * @return 0 on success or a negative error code.</span>
<a name="l00576"></a>00576 <span class="comment"> */</span>
<a name="l00577"></a><a class="code" href="group__msg.html#ga87ebc73ca93e5fa90742021eba448e60">00577</a> <span class="keywordtype">int</span> <a class="code" href="group__msg.html#ga87ebc73ca93e5fa90742021eba448e60" title="Expand maximum payload size of a netlink message.">nlmsg_expand</a>(<span class="keyword">struct</span> nl_msg *n, <span class="keywordtype">size_t</span> newlen)
<a name="l00578"></a>00578 {
<a name="l00579"></a>00579 <span class="keywordtype">void</span> *tmp;
<a name="l00580"></a>00580
<a name="l00581"></a>00581 <span class="keywordflow">if</span> (newlen <= n->nm_size)
<a name="l00582"></a>00582 <span class="keywordflow">return</span> nl_errno(EINVAL);
<a name="l00583"></a>00583
<a name="l00584"></a>00584 tmp = realloc(n->nm_nlh, newlen);
<a name="l00585"></a>00585 <span class="keywordflow">if</span> (tmp == NULL)
<a name="l00586"></a>00586 <span class="keywordflow">return</span> nl_errno(ENOMEM);
<a name="l00587"></a>00587
<a name="l00588"></a>00588 n->nm_nlh = tmp;
<a name="l00589"></a>00589 n->nm_size = newlen;
<a name="l00590"></a>00590
<a name="l00591"></a>00591 <span class="keywordflow">return</span> 0;
<a name="l00592"></a>00592 }
<a name="l00593"></a>00593 <span class="comment"></span>
<a name="l00594"></a>00594 <span class="comment">/**</span>
<a name="l00595"></a>00595 <span class="comment"> * Add a netlink message header to a netlink message</span>
<a name="l00596"></a>00596 <span class="comment"> * @arg n netlink message</span>
<a name="l00597"></a>00597 <span class="comment"> * @arg pid netlink process id or NL_AUTO_PID</span>
<a name="l00598"></a>00598 <span class="comment"> * @arg seq sequence number of message or NL_AUTO_SEQ</span>
<a name="l00599"></a>00599 <span class="comment"> * @arg type message type</span>
<a name="l00600"></a>00600 <span class="comment"> * @arg payload length of message payload</span>
<a name="l00601"></a>00601 <span class="comment"> * @arg flags message flags</span>
<a name="l00602"></a>00602 <span class="comment"> *</span>
<a name="l00603"></a>00603 <span class="comment"> * Adds or overwrites the netlink message header in an existing message</span>
<a name="l00604"></a>00604 <span class="comment"> * object. If \a payload is greater-than zero additional room will be</span>
<a name="l00605"></a>00605 <span class="comment"> * reserved, f.e. for family specific headers. It can be accesed via</span>
<a name="l00606"></a>00606 <span class="comment"> * nlmsg_data().</span>
<a name="l00607"></a>00607 <span class="comment"> *</span>
<a name="l00608"></a>00608 <span class="comment"> * @return A pointer to the netlink message header or NULL.</span>
<a name="l00609"></a>00609 <span class="comment"> */</span>
<a name="l00610"></a><a class="code" href="group__msg.html#ga16919a9a8579f8b538b0376781c1839d">00610</a> <span class="keyword">struct </span><a class="code" href="structnlmsghdr.html" title="Netlink message header.">nlmsghdr</a> *<a class="code" href="group__msg.html#ga16919a9a8579f8b538b0376781c1839d" title="Add a netlink message header to a netlink message.">nlmsg_put</a>(<span class="keyword">struct</span> nl_msg *n, uint32_t pid, uint32_t seq,
<a name="l00611"></a>00611 <span class="keywordtype">int</span> type, <span class="keywordtype">int</span> payload, <span class="keywordtype">int</span> flags)
<a name="l00612"></a>00612 {
<a name="l00613"></a>00613 <span class="keyword">struct </span><a class="code" href="structnlmsghdr.html" title="Netlink message header.">nlmsghdr</a> *nlh;
<a name="l00614"></a>00614
<a name="l00615"></a>00615 <span class="keywordflow">if</span> (n->nm_nlh->nlmsg_len < NLMSG_HDRLEN)
<a name="l00616"></a>00616 BUG();
<a name="l00617"></a>00617
<a name="l00618"></a>00618 nlh = (<span class="keyword">struct </span><a class="code" href="structnlmsghdr.html" title="Netlink message header.">nlmsghdr</a> *) n->nm_nlh;
<a name="l00619"></a>00619 nlh-><a class="code" href="structnlmsghdr.html#a7232c4e6cb513010e64887b7eebf8823" title="Message type (content type)">nlmsg_type</a> = type;
<a name="l00620"></a>00620 nlh-><a class="code" href="structnlmsghdr.html#abcf664d354ea35ebb9b3d8a50088fec6" title="Message flags.">nlmsg_flags</a> = flags;
<a name="l00621"></a>00621 nlh-><a class="code" href="structnlmsghdr.html#a071903f5e2400298bca69ac70500421f" title="Netlink PID of the proccess sending the message.">nlmsg_pid</a> = pid;
<a name="l00622"></a>00622 nlh-><a class="code" href="structnlmsghdr.html#ad6c6a7aa9de65bb2da498c84148be7e6" title="Sequence number.">nlmsg_seq</a> = seq;
<a name="l00623"></a>00623
<a name="l00624"></a>00624 NL_DBG(2, <span class="stringliteral">"msg %p: Added netlink header type=%d, flags=%d, pid=%d, "</span>
<a name="l00625"></a>00625 <span class="stringliteral">"seq=%d\n"</span>, n, type, flags, pid, seq);
<a name="l00626"></a>00626
<a name="l00627"></a>00627 <span class="keywordflow">if</span> (payload > 0 &&
<a name="l00628"></a>00628 <a class="code" href="group__msg.html#ga206eac17e0e75ae8457a513612395554" title="Reserve room for additional data in a netlink message.">nlmsg_reserve</a>(n, payload, NLMSG_ALIGNTO) == NULL)
<a name="l00629"></a>00629 <span class="keywordflow">return</span> NULL;
<a name="l00630"></a>00630
<a name="l00631"></a>00631 <span class="keywordflow">return</span> nlh;
<a name="l00632"></a>00632 }
<a name="l00633"></a>00633 <span class="comment"></span>
<a name="l00634"></a>00634 <span class="comment">/**</span>
<a name="l00635"></a>00635 <span class="comment"> * Return actual netlink message</span>
<a name="l00636"></a>00636 <span class="comment"> * @arg n netlink message</span>
<a name="l00637"></a>00637 <span class="comment"> * </span>
<a name="l00638"></a>00638 <span class="comment"> * Returns the actual netlink message casted to the type of the netlink</span>
<a name="l00639"></a>00639 <span class="comment"> * message header.</span>
<a name="l00640"></a>00640 <span class="comment"> * </span>
<a name="l00641"></a>00641 <span class="comment"> * @return A pointer to the netlink message.</span>
<a name="l00642"></a>00642 <span class="comment"> */</span>
<a name="l00643"></a><a class="code" href="group__msg.html#gaa5f29579d86d2bdab26c312b44b56de7">00643</a> <span class="keyword">struct </span><a class="code" href="structnlmsghdr.html" title="Netlink message header.">nlmsghdr</a> *<a class="code" href="group__msg.html#gaa5f29579d86d2bdab26c312b44b56de7" title="Return actual netlink message.">nlmsg_hdr</a>(<span class="keyword">struct</span> nl_msg *n)
<a name="l00644"></a>00644 {
<a name="l00645"></a>00645 <span class="keywordflow">return</span> n->nm_nlh;
<a name="l00646"></a>00646 }
<a name="l00647"></a>00647 <span class="comment"></span>
<a name="l00648"></a>00648 <span class="comment">/**</span>
<a name="l00649"></a>00649 <span class="comment"> * Free a netlink message</span>
<a name="l00650"></a>00650 <span class="comment"> * @arg n netlink message</span>
<a name="l00651"></a>00651 <span class="comment"> *</span>
<a name="l00652"></a>00652 <span class="comment"> * Destroys a netlink message and frees up all used memory.</span>
<a name="l00653"></a>00653 <span class="comment"> *</span>
<a name="l00654"></a>00654 <span class="comment"> * @pre The message must be unused.</span>
<a name="l00655"></a>00655 <span class="comment"> */</span>
<a name="l00656"></a><a class="code" href="group__msg.html#ga138ba9bee70553f9fbe7143deacad48c">00656</a> <span class="keywordtype">void</span> <a class="code" href="group__msg.html#ga138ba9bee70553f9fbe7143deacad48c" title="Free a netlink message.">nlmsg_free</a>(<span class="keyword">struct</span> nl_msg *n)
<a name="l00657"></a>00657 {
<a name="l00658"></a>00658 <span class="keywordflow">if</span> (!n)
<a name="l00659"></a>00659 <span class="keywordflow">return</span>;
<a name="l00660"></a>00660
<a name="l00661"></a>00661 free(n->nm_nlh);
<a name="l00662"></a>00662 free(n);
<a name="l00663"></a>00663 NL_DBG(2, <span class="stringliteral">"msg %p: Freed\n"</span>, n);
<a name="l00664"></a>00664 }
<a name="l00665"></a>00665 <span class="comment"></span>
<a name="l00666"></a>00666 <span class="comment">/** @} */</span>
<a name="l00667"></a>00667 <span class="comment"></span>
<a name="l00668"></a>00668 <span class="comment">/**</span>
<a name="l00669"></a>00669 <span class="comment"> * @name Attributes</span>
<a name="l00670"></a>00670 <span class="comment"> * @{</span>
<a name="l00671"></a>00671 <span class="comment"> */</span>
<a name="l00672"></a>00672
<a name="l00673"></a>00673 <span class="keywordtype">void</span> nlmsg_set_proto(<span class="keyword">struct</span> nl_msg *msg, <span class="keywordtype">int</span> protocol)
<a name="l00674"></a>00674 {
<a name="l00675"></a>00675 msg->nm_protocol = protocol;
<a name="l00676"></a>00676 }
<a name="l00677"></a>00677
<a name="l00678"></a>00678 <span class="keywordtype">int</span> nlmsg_get_proto(<span class="keyword">struct</span> nl_msg *msg)
<a name="l00679"></a>00679 {
<a name="l00680"></a>00680 <span class="keywordflow">return</span> msg->nm_protocol;
<a name="l00681"></a>00681 }
<a name="l00682"></a>00682
<a name="l00683"></a>00683 <span class="keywordtype">size_t</span> nlmsg_get_max_size(<span class="keyword">struct</span> nl_msg *msg)
<a name="l00684"></a>00684 {
<a name="l00685"></a>00685 <span class="keywordflow">return</span> msg->nm_size;
<a name="l00686"></a>00686 }
<a name="l00687"></a>00687
<a name="l00688"></a>00688 <span class="keywordtype">void</span> nlmsg_set_src(<span class="keyword">struct</span> nl_msg *msg, <span class="keyword">struct</span> <a class="code" href="structsockaddr__nl.html" title="Netlink socket address.">sockaddr_nl</a> *addr)
<a name="l00689"></a>00689 {
<a name="l00690"></a>00690 memcpy(&msg->nm_src, addr, <span class="keyword">sizeof</span>(*addr));
<a name="l00691"></a>00691 }
<a name="l00692"></a>00692
<a name="l00693"></a>00693 <span class="keyword">struct </span><a class="code" href="structsockaddr__nl.html" title="Netlink socket address.">sockaddr_nl</a> *nlmsg_get_src(<span class="keyword">struct</span> nl_msg *msg)
<a name="l00694"></a>00694 {
<a name="l00695"></a>00695 <span class="keywordflow">return</span> &msg->nm_src;
<a name="l00696"></a>00696 }
<a name="l00697"></a>00697
<a name="l00698"></a>00698 <span class="keywordtype">void</span> nlmsg_set_dst(<span class="keyword">struct</span> nl_msg *msg, <span class="keyword">struct</span> <a class="code" href="structsockaddr__nl.html" title="Netlink socket address.">sockaddr_nl</a> *addr)
<a name="l00699"></a>00699 {
<a name="l00700"></a>00700 memcpy(&msg->nm_dst, addr, <span class="keyword">sizeof</span>(*addr));
<a name="l00701"></a>00701 }
<a name="l00702"></a>00702
<a name="l00703"></a>00703 <span class="keyword">struct </span><a class="code" href="structsockaddr__nl.html" title="Netlink socket address.">sockaddr_nl</a> *nlmsg_get_dst(<span class="keyword">struct</span> nl_msg *msg)
<a name="l00704"></a>00704 {
<a name="l00705"></a>00705 <span class="keywordflow">return</span> &msg->nm_dst;
<a name="l00706"></a>00706 }
<a name="l00707"></a>00707
<a name="l00708"></a>00708 <span class="keywordtype">void</span> nlmsg_set_creds(<span class="keyword">struct</span> nl_msg *msg, <span class="keyword">struct</span> ucred *creds)
<a name="l00709"></a>00709 {
<a name="l00710"></a>00710 memcpy(&msg->nm_creds, creds, <span class="keyword">sizeof</span>(*creds));
<a name="l00711"></a>00711 msg->nm_flags |= NL_MSG_CRED_PRESENT;
<a name="l00712"></a>00712 }
<a name="l00713"></a>00713
<a name="l00714"></a>00714 <span class="keyword">struct </span>ucred *nlmsg_get_creds(<span class="keyword">struct</span> nl_msg *msg)
<a name="l00715"></a>00715 {
<a name="l00716"></a>00716 <span class="keywordflow">if</span> (msg->nm_flags & NL_MSG_CRED_PRESENT)
<a name="l00717"></a>00717 <span class="keywordflow">return</span> &msg->nm_creds;
<a name="l00718"></a>00718 <span class="keywordflow">return</span> NULL;
<a name="l00719"></a>00719 }
<a name="l00720"></a>00720 <span class="comment"></span>
<a name="l00721"></a>00721 <span class="comment">/** @} */</span>
<a name="l00722"></a>00722 <span class="comment"></span>
<a name="l00723"></a>00723 <span class="comment">/**</span>
<a name="l00724"></a>00724 <span class="comment"> * @name Netlink Message Type Translations</span>
<a name="l00725"></a>00725 <span class="comment"> * @{</span>
<a name="l00726"></a>00726 <span class="comment"> */</span>
<a name="l00727"></a>00727
<a name="l00728"></a>00728 <span class="keyword">static</span> <span class="keyword">struct </span>trans_tbl nl_msgtypes[] = {
<a name="l00729"></a>00729 __ADD(<a class="code" href="group__msg.html#ga3033de03e6242ba7d7ffd2f2f4d3fb38" title="No operation, message must be ignored.">NLMSG_NOOP</a>,NOOP)
<a name="l00730"></a>00730 __ADD(<a class="code" href="group__msg.html#ga2d6d3c937fdda1d64201c5abfd5a2b83" title="The message signals an error and the payload contains a nlmsgerr structure.">NLMSG_ERROR</a>,ERROR)
<a name="l00731"></a>00731 __ADD(<a class="code" href="group__msg.html#ga151b98bf01f462dbc5d3c69e6396e064" title="Message terminates a multipart message.">NLMSG_DONE</a>,DONE)
<a name="l00732"></a>00732 __ADD(<a class="code" href="group__msg.html#ga369a70cf77edb2766b2196dfc70e9147" title="The message signals that data got lost.">NLMSG_OVERRUN</a>,OVERRUN)
<a name="l00733"></a>00733 };
<a name="l00734"></a>00734
<a name="l00735"></a>00735 <span class="keywordtype">char</span> *nl_nlmsgtype2str(<span class="keywordtype">int</span> type, <span class="keywordtype">char</span> *buf, <span class="keywordtype">size_t</span> size)
<a name="l00736"></a>00736 {
<a name="l00737"></a>00737 <span class="keywordflow">return</span> __type2str(type, buf, size, nl_msgtypes,
<a name="l00738"></a>00738 ARRAY_SIZE(nl_msgtypes));
<a name="l00739"></a>00739 }
<a name="l00740"></a>00740
<a name="l00741"></a>00741 <span class="keywordtype">int</span> nl_str2nlmsgtype(<span class="keyword">const</span> <span class="keywordtype">char</span> *name)
<a name="l00742"></a>00742 {
<a name="l00743"></a>00743 <span class="keywordflow">return</span> __str2type(name, nl_msgtypes, ARRAY_SIZE(nl_msgtypes));
<a name="l00744"></a>00744 }
<a name="l00745"></a>00745 <span class="comment"></span>
<a name="l00746"></a>00746 <span class="comment">/** @} */</span>
<a name="l00747"></a>00747 <span class="comment"></span>
<a name="l00748"></a>00748 <span class="comment">/**</span>
<a name="l00749"></a>00749 <span class="comment"> * @name Netlink Message Flags Translations</span>
<a name="l00750"></a>00750 <span class="comment"> * @{</span>
<a name="l00751"></a>00751 <span class="comment"> */</span>
<a name="l00752"></a>00752
<a name="l00753"></a>00753 <span class="keywordtype">char</span> *nl_nlmsg_flags2str(<span class="keywordtype">int</span> flags, <span class="keywordtype">char</span> *buf, <span class="keywordtype">size_t</span> len)
<a name="l00754"></a>00754 {
<a name="l00755"></a>00755 memset(buf, 0, len);
<a name="l00756"></a>00756
<a name="l00757"></a>00757 <span class="preprocessor">#define PRINT_FLAG(f) \</span>
<a name="l00758"></a>00758 <span class="preprocessor"> if (flags & NLM_F_##f) { \</span>
<a name="l00759"></a>00759 <span class="preprocessor"> flags &= ~NLM_F_##f; \</span>
<a name="l00760"></a>00760 <span class="preprocessor"> strncat(buf, #f, len - strlen(buf) - 1); \</span>
<a name="l00761"></a>00761 <span class="preprocessor"> if (flags) \</span>
<a name="l00762"></a>00762 <span class="preprocessor"> strncat(buf, ",", len - strlen(buf) - 1); \</span>
<a name="l00763"></a>00763 <span class="preprocessor"> }</span>
<a name="l00764"></a>00764 <span class="preprocessor"></span>
<a name="l00765"></a>00765 PRINT_FLAG(REQUEST);
<a name="l00766"></a>00766 PRINT_FLAG(MULTI);
<a name="l00767"></a>00767 PRINT_FLAG(ACK);
<a name="l00768"></a>00768 PRINT_FLAG(ECHO);
<a name="l00769"></a>00769 PRINT_FLAG(ROOT);
<a name="l00770"></a>00770 PRINT_FLAG(MATCH);
<a name="l00771"></a>00771 PRINT_FLAG(ATOMIC);
<a name="l00772"></a>00772 PRINT_FLAG(REPLACE);
<a name="l00773"></a>00773 PRINT_FLAG(EXCL);
<a name="l00774"></a>00774 PRINT_FLAG(CREATE);
<a name="l00775"></a>00775 PRINT_FLAG(APPEND);
<a name="l00776"></a>00776
<a name="l00777"></a>00777 <span class="keywordflow">if</span> (flags) {
<a name="l00778"></a>00778 <span class="keywordtype">char</span> s[32];
<a name="l00779"></a>00779 snprintf(s, <span class="keyword">sizeof</span>(s), <span class="stringliteral">"0x%x"</span>, flags);
<a name="l00780"></a>00780 strncat(buf, s, len - strlen(buf) - 1);
<a name="l00781"></a>00781 }
<a name="l00782"></a>00782 <span class="preprocessor">#undef PRINT_FLAG</span>
<a name="l00783"></a>00783 <span class="preprocessor"></span>
<a name="l00784"></a>00784 <span class="keywordflow">return</span> buf;
<a name="l00785"></a>00785 }
<a name="l00786"></a>00786 <span class="comment"></span>
<a name="l00787"></a>00787 <span class="comment">/** @} */</span>
<a name="l00788"></a>00788 <span class="comment"></span>
<a name="l00789"></a>00789 <span class="comment">/**</span>
<a name="l00790"></a>00790 <span class="comment"> * @name Direct Parsing</span>
<a name="l00791"></a>00791 <span class="comment"> * @{</span>
<a name="l00792"></a>00792 <span class="comment"> */</span>
<a name="l00793"></a>00793 <span class="comment"></span>
<a name="l00794"></a>00794 <span class="comment">/** @cond SKIP */</span>
<a name="l00795"></a>00795 <span class="keyword">struct </span>dp_xdata {
<a name="l00796"></a>00796 void (*cb)(<span class="keyword">struct </span>nl_object *, <span class="keywordtype">void</span> *);
<a name="l00797"></a>00797 <span class="keywordtype">void</span> *arg;
<a name="l00798"></a>00798 };<span class="comment"></span>
<a name="l00799"></a>00799 <span class="comment">/** @endcond */</span>
<a name="l00800"></a>00800
<a name="l00801"></a>00801 <span class="keyword">static</span> <span class="keywordtype">int</span> parse_cb(<span class="keyword">struct</span> nl_object *obj, <span class="keyword">struct</span> <a class="code" href="structnl__parser__param.html">nl_parser_param</a> *p)
<a name="l00802"></a>00802 {
<a name="l00803"></a>00803 <span class="keyword">struct </span>dp_xdata *x = p->pp_arg;
<a name="l00804"></a>00804
<a name="l00805"></a>00805 x->cb(obj, x->arg);
<a name="l00806"></a>00806 <span class="keywordflow">return</span> 0;
<a name="l00807"></a>00807 }
<a name="l00808"></a>00808
<a name="l00809"></a>00809 <span class="keywordtype">int</span> nl_msg_parse(<span class="keyword">struct</span> nl_msg *msg, <span class="keywordtype">void</span> (*cb)(<span class="keyword">struct</span> nl_object *, <span class="keywordtype">void</span> *),
<a name="l00810"></a>00810 <span class="keywordtype">void</span> *arg)
<a name="l00811"></a>00811 {
<a name="l00812"></a>00812 <span class="keyword">struct </span><a class="code" href="structnl__cache__ops.html" title="Cache Operations.">nl_cache_ops</a> *ops;
<a name="l00813"></a>00813 <span class="keyword">struct </span><a class="code" href="structnl__parser__param.html">nl_parser_param</a> p = {
<a name="l00814"></a>00814 .pp_cb = parse_cb
<a name="l00815"></a>00815 };
<a name="l00816"></a>00816 <span class="keyword">struct </span>dp_xdata x = {
<a name="l00817"></a>00817 .cb = cb,
<a name="l00818"></a>00818 .arg = arg,
<a name="l00819"></a>00819 };
<a name="l00820"></a>00820
<a name="l00821"></a>00821 ops = <a class="code" href="group__cache__mngt.html#ga92ddd84e94041733d8def0492b0afc1e" title="Associate a message type to a set of cache operations.">nl_cache_ops_associate</a>(nlmsg_get_proto(msg),
<a name="l00822"></a>00822 <a class="code" href="group__msg.html#gaa5f29579d86d2bdab26c312b44b56de7" title="Return actual netlink message.">nlmsg_hdr</a>(msg)->nlmsg_type);
<a name="l00823"></a>00823 <span class="keywordflow">if</span> (ops == NULL)
<a name="l00824"></a>00824 <span class="keywordflow">return</span> nl_error(ENOENT, <span class="stringliteral">"Unknown message type %d"</span>,
<a name="l00825"></a>00825 <a class="code" href="group__msg.html#gaa5f29579d86d2bdab26c312b44b56de7" title="Return actual netlink message.">nlmsg_hdr</a>(msg)->nlmsg_type);
<a name="l00826"></a>00826 p.pp_arg = &x;
<a name="l00827"></a>00827
<a name="l00828"></a>00828 <span class="keywordflow">return</span> nl_cache_parse(ops, NULL, <a class="code" href="group__msg.html#gaa5f29579d86d2bdab26c312b44b56de7" title="Return actual netlink message.">nlmsg_hdr</a>(msg), &p);
<a name="l00829"></a>00829 }
<a name="l00830"></a>00830 <span class="comment"></span>
<a name="l00831"></a>00831 <span class="comment">/** @} */</span>
<a name="l00832"></a>00832 <span class="comment"></span>
<a name="l00833"></a>00833 <span class="comment">/**</span>
<a name="l00834"></a>00834 <span class="comment"> * @name Dumping</span>
<a name="l00835"></a>00835 <span class="comment"> * @{</span>
<a name="l00836"></a>00836 <span class="comment"> */</span>
<a name="l00837"></a>00837
<a name="l00838"></a>00838 <span class="keyword">static</span> <span class="keywordtype">void</span> prefix_line(FILE *ofd, <span class="keywordtype">int</span> prefix)
<a name="l00839"></a>00839 {
<a name="l00840"></a>00840 <span class="keywordtype">int</span> i;
<a name="l00841"></a>00841
<a name="l00842"></a>00842 <span class="keywordflow">for</span> (i = 0; i < prefix; i++)
<a name="l00843"></a>00843 fprintf(ofd, <span class="stringliteral">" "</span>);
<a name="l00844"></a>00844 }
<a name="l00845"></a>00845
<a name="l00846"></a>00846 <span class="keyword">static</span> <span class="keyword">inline</span> <span class="keywordtype">void</span> dump_hex(FILE *ofd, <span class="keywordtype">char</span> *start, <span class="keywordtype">int</span> len, <span class="keywordtype">int</span> prefix)
<a name="l00847"></a>00847 {
<a name="l00848"></a>00848 <span class="keywordtype">int</span> i, a, c, limit;
<a name="l00849"></a>00849 <span class="keywordtype">char</span> ascii[21] = {0};
<a name="l00850"></a>00850
<a name="l00851"></a>00851 limit = 18 - (prefix * 2);
<a name="l00852"></a>00852 prefix_line(ofd, prefix);
<a name="l00853"></a>00853 fprintf(ofd, <span class="stringliteral">" "</span>);
<a name="l00854"></a>00854
<a name="l00855"></a>00855 <span class="keywordflow">for</span> (i = 0, a = 0, c = 0; i < len; i++) {
<a name="l00856"></a>00856 <span class="keywordtype">int</span> v = *(uint8_t *) (start + i);
<a name="l00857"></a>00857
<a name="l00858"></a>00858 fprintf(ofd, <span class="stringliteral">"%02x "</span>, v);
<a name="l00859"></a>00859 ascii[a++] = isprint(v) ? v : <span class="charliteral">'.'</span>;
<a name="l00860"></a>00860
<a name="l00861"></a>00861 <span class="keywordflow">if</span> (c == limit-1) {
<a name="l00862"></a>00862 fprintf(ofd, <span class="stringliteral">"%s\n"</span>, ascii);
<a name="l00863"></a>00863 <span class="keywordflow">if</span> (i < (len - 1)) {
<a name="l00864"></a>00864 prefix_line(ofd, prefix);
<a name="l00865"></a>00865 fprintf(ofd, <span class="stringliteral">" "</span>);
<a name="l00866"></a>00866 }
<a name="l00867"></a>00867 a = c = 0;
<a name="l00868"></a>00868 memset(ascii, 0, <span class="keyword">sizeof</span>(ascii));
<a name="l00869"></a>00869 } <span class="keywordflow">else</span>
<a name="l00870"></a>00870 c++;
<a name="l00871"></a>00871 }
<a name="l00872"></a>00872
<a name="l00873"></a>00873 <span class="keywordflow">if</span> (c != 0) {
<a name="l00874"></a>00874 <span class="keywordflow">for</span> (i = 0; i < (limit - c); i++)
<a name="l00875"></a>00875 fprintf(ofd, <span class="stringliteral">" "</span>);
<a name="l00876"></a>00876 fprintf(ofd, <span class="stringliteral">"%s\n"</span>, ascii);
<a name="l00877"></a>00877 }
<a name="l00878"></a>00878 }
<a name="l00879"></a>00879
<a name="l00880"></a>00880 <span class="keyword">static</span> <span class="keywordtype">void</span> print_hdr(FILE *ofd, <span class="keyword">struct</span> nl_msg *msg)
<a name="l00881"></a>00881 {
<a name="l00882"></a>00882 <span class="keyword">struct </span><a class="code" href="structnlmsghdr.html" title="Netlink message header.">nlmsghdr</a> *nlh = <a class="code" href="group__msg.html#gaa5f29579d86d2bdab26c312b44b56de7" title="Return actual netlink message.">nlmsg_hdr</a>(msg);
<a name="l00883"></a>00883 <span class="keyword">struct </span><a class="code" href="structnl__cache__ops.html" title="Cache Operations.">nl_cache_ops</a> *ops;
<a name="l00884"></a>00884 <span class="keyword">struct </span><a class="code" href="structnl__msgtype.html" title="Message type to cache action association.">nl_msgtype</a> *mt;
<a name="l00885"></a>00885 <span class="keywordtype">char</span> buf[128];
<a name="l00886"></a>00886
<a name="l00887"></a>00887 fprintf(ofd, <span class="stringliteral">" .nlmsg_len = %d\n"</span>, nlh-><a class="code" href="structnlmsghdr.html#a5a3fdb3436743ec73e75471c899fd4bc" title="Length of message including header.">nlmsg_len</a>);
<a name="l00888"></a>00888
<a name="l00889"></a>00889 ops = <a class="code" href="group__cache__mngt.html#ga92ddd84e94041733d8def0492b0afc1e" title="Associate a message type to a set of cache operations.">nl_cache_ops_associate</a>(nlmsg_get_proto(msg), nlh-><a class="code" href="structnlmsghdr.html#a7232c4e6cb513010e64887b7eebf8823" title="Message type (content type)">nlmsg_type</a>);
<a name="l00890"></a>00890 <span class="keywordflow">if</span> (ops) {
<a name="l00891"></a>00891 mt = <a class="code" href="group__cache__mngt.html#ga8c4f353b471c72ce5158ad89318eb910" title="Lookup message type cache association.">nl_msgtype_lookup</a>(ops, nlh-><a class="code" href="structnlmsghdr.html#a7232c4e6cb513010e64887b7eebf8823" title="Message type (content type)">nlmsg_type</a>);
<a name="l00892"></a>00892 <span class="keywordflow">if</span> (!mt)
<a name="l00893"></a>00893 BUG();
<a name="l00894"></a>00894
<a name="l00895"></a>00895 snprintf(buf, <span class="keyword">sizeof</span>(buf), <span class="stringliteral">"%s::%s"</span>, ops->co_name, mt-><a class="code" href="structnl__msgtype.html#a8a50cfe0a76d4bbe95473f5d2a3a5b96" title="Name of operation for human-readable printing.">mt_name</a>);
<a name="l00896"></a>00896 } <span class="keywordflow">else</span>
<a name="l00897"></a>00897 nl_nlmsgtype2str(nlh-><a class="code" href="structnlmsghdr.html#a7232c4e6cb513010e64887b7eebf8823" title="Message type (content type)">nlmsg_type</a>, buf, <span class="keyword">sizeof</span>(buf));
<a name="l00898"></a>00898
<a name="l00899"></a>00899 fprintf(ofd, <span class="stringliteral">" .nlmsg_type = %d <%s>\n"</span>, nlh-><a class="code" href="structnlmsghdr.html#a7232c4e6cb513010e64887b7eebf8823" title="Message type (content type)">nlmsg_type</a>, buf);
<a name="l00900"></a>00900 fprintf(ofd, <span class="stringliteral">" .nlmsg_flags = %d <%s>\n"</span>, nlh-><a class="code" href="structnlmsghdr.html#abcf664d354ea35ebb9b3d8a50088fec6" title="Message flags.">nlmsg_flags</a>,
<a name="l00901"></a>00901 nl_nlmsg_flags2str(nlh-><a class="code" href="structnlmsghdr.html#abcf664d354ea35ebb9b3d8a50088fec6" title="Message flags.">nlmsg_flags</a>, buf, <span class="keyword">sizeof</span>(buf)));
<a name="l00902"></a>00902 fprintf(ofd, <span class="stringliteral">" .nlmsg_seq = %d\n"</span>, nlh-><a class="code" href="structnlmsghdr.html#ad6c6a7aa9de65bb2da498c84148be7e6" title="Sequence number.">nlmsg_seq</a>);
<a name="l00903"></a>00903 fprintf(ofd, <span class="stringliteral">" .nlmsg_pid = %d\n"</span>, nlh-><a class="code" href="structnlmsghdr.html#a071903f5e2400298bca69ac70500421f" title="Netlink PID of the proccess sending the message.">nlmsg_pid</a>);
<a name="l00904"></a>00904
<a name="l00905"></a>00905 }
<a name="l00906"></a>00906
<a name="l00907"></a>00907 <span class="keyword">static</span> <span class="keywordtype">void</span> dump_attrs(FILE *ofd, <span class="keyword">struct</span> nlattr *attrs, <span class="keywordtype">int</span> attrlen,
<a name="l00908"></a>00908 <span class="keywordtype">int</span> prefix)
<a name="l00909"></a>00909 {
<a name="l00910"></a>00910 <span class="keywordtype">int</span> rem;
<a name="l00911"></a>00911 <span class="keyword">struct </span>nlattr *nla;
<a name="l00912"></a>00912
<a name="l00913"></a>00913 <a class="code" href="group__attr.html#ga7a262955c3fb8eab3158bd07180fbc2c" title="iterate over a stream of attributes">nla_for_each_attr</a>(nla, attrs, attrlen, rem) {
<a name="l00914"></a>00914 <span class="keywordtype">int</span> padlen, alen = <a class="code" href="group__attr.html#gac5a7705797946fa9c0775997bb8d130b" title="length of payload">nla_len</a>(nla);
<a name="l00915"></a>00915
<a name="l00916"></a>00916 prefix_line(ofd, prefix);
<a name="l00917"></a>00917 fprintf(ofd, <span class="stringliteral">" [ATTR %02d%s] %d octets\n"</span>, <a class="code" href="group__attr.html#ga4aa5611a0b84b217ee9a7dd2b0491128" title="attribute type">nla_type</a>(nla),
<a name="l00918"></a>00918 nla->nla_type & NLA_F_NESTED ? <span class="stringliteral">" NESTED"</span> : <span class="stringliteral">""</span>,
<a name="l00919"></a>00919 alen);
<a name="l00920"></a>00920
<a name="l00921"></a>00921 <span class="keywordflow">if</span> (nla->nla_type & NLA_F_NESTED)
<a name="l00922"></a>00922 dump_attrs(ofd, <a class="code" href="group__attr.html#gaf39d6bbd2be1fc2de30b6b7d079a5fce" title="head of payload">nla_data</a>(nla), alen, prefix+1);
<a name="l00923"></a>00923 <span class="keywordflow">else</span>
<a name="l00924"></a>00924 dump_hex(ofd, <a class="code" href="group__attr.html#gaf39d6bbd2be1fc2de30b6b7d079a5fce" title="head of payload">nla_data</a>(nla), alen, prefix);
<a name="l00925"></a>00925
<a name="l00926"></a>00926 padlen = <a class="code" href="group__attr.html#gae24ddf8c4bb186eaaed15ecb2d08b816" title="length of padding at the tail of the attribute">nla_padlen</a>(alen);
<a name="l00927"></a>00927 <span class="keywordflow">if</span> (padlen > 0) {
<a name="l00928"></a>00928 prefix_line(ofd, prefix);
<a name="l00929"></a>00929 fprintf(ofd, <span class="stringliteral">" [PADDING] %d octets\n"</span>,
<a name="l00930"></a>00930 padlen);
<a name="l00931"></a>00931 dump_hex(ofd, <a class="code" href="group__attr.html#gaf39d6bbd2be1fc2de30b6b7d079a5fce" title="head of payload">nla_data</a>(nla) + alen,
<a name="l00932"></a>00932 padlen, prefix);
<a name="l00933"></a>00933 }
<a name="l00934"></a>00934 }
<a name="l00935"></a>00935
<a name="l00936"></a>00936 <span class="keywordflow">if</span> (rem) {
<a name="l00937"></a>00937 prefix_line(ofd, prefix);
<a name="l00938"></a>00938 fprintf(ofd, <span class="stringliteral">" [LEFTOVER] %d octets\n"</span>, rem);
<a name="l00939"></a>00939 }
<a name="l00940"></a>00940 }
<a name="l00941"></a>00941 <span class="comment"></span>
<a name="l00942"></a>00942 <span class="comment">/**</span>
<a name="l00943"></a>00943 <span class="comment"> * Dump message in human readable format to file descriptor</span>
<a name="l00944"></a>00944 <span class="comment"> * @arg msg Message to print</span>
<a name="l00945"></a>00945 <span class="comment"> * @arg ofd File descriptor.</span>
<a name="l00946"></a>00946 <span class="comment"> */</span>
<a name="l00947"></a><a class="code" href="group__msg.html#ga062de3af7d634b7638c053e4ba67a7eb">00947</a> <span class="keywordtype">void</span> <a class="code" href="group__msg.html#ga062de3af7d634b7638c053e4ba67a7eb" title="Dump message in human readable format to file descriptor.">nl_msg_dump</a>(<span class="keyword">struct</span> nl_msg *msg, FILE *ofd)
<a name="l00948"></a>00948 {
<a name="l00949"></a>00949 <span class="keyword">struct </span><a class="code" href="structnlmsghdr.html" title="Netlink message header.">nlmsghdr</a> *hdr = <a class="code" href="group__msg.html#gaa5f29579d86d2bdab26c312b44b56de7" title="Return actual netlink message.">nlmsg_hdr</a>(msg);
<a name="l00950"></a>00950
<a name="l00951"></a>00951 fprintf(ofd,
<a name="l00952"></a>00952 <span class="stringliteral">"-------------------------- BEGIN NETLINK MESSAGE "</span>
<a name="l00953"></a>00953 <span class="stringliteral">"---------------------------\n"</span>);
<a name="l00954"></a>00954
<a name="l00955"></a>00955 fprintf(ofd, <span class="stringliteral">" [HEADER] %Zu octets\n"</span>, <span class="keyword">sizeof</span>(<span class="keyword">struct</span> <a class="code" href="structnlmsghdr.html" title="Netlink message header.">nlmsghdr</a>));
<a name="l00956"></a>00956 print_hdr(ofd, msg);
<a name="l00957"></a>00957
<a name="l00958"></a>00958 <span class="keywordflow">if</span> (hdr-><a class="code" href="structnlmsghdr.html#a7232c4e6cb513010e64887b7eebf8823" title="Message type (content type)">nlmsg_type</a> == NLMSG_ERROR &&
<a name="l00959"></a>00959 hdr-><a class="code" href="structnlmsghdr.html#a5a3fdb3436743ec73e75471c899fd4bc" title="Length of message including header.">nlmsg_len</a> >= <a class="code" href="group__msg.html#ga3790ddfe9268d3b63f3cd1ceb9bb2f83" title="length of netlink message not including padding">nlmsg_msg_size</a>(<span class="keyword">sizeof</span>(<span class="keyword">struct</span> <a class="code" href="structnlmsgerr.html" title="Netlink error message.">nlmsgerr</a>))) {
<a name="l00960"></a>00960 <span class="keyword">struct </span>nl_msg *errmsg;
<a name="l00961"></a>00961 <span class="keyword">struct </span><a class="code" href="structnlmsgerr.html" title="Netlink error message.">nlmsgerr</a> *err = <a class="code" href="group__msg.html#gae44a904bb40c8b5f5ff31539c21cfa5a" title="head of message payload">nlmsg_data</a>(hdr);
<a name="l00962"></a>00962
<a name="l00963"></a>00963 fprintf(ofd, <span class="stringliteral">" [ERRORMSG] %Zu octets\n"</span>, <span class="keyword">sizeof</span>(*err));
<a name="l00964"></a>00964 fprintf(ofd, <span class="stringliteral">" .error = %d \"%s\"\n"</span>, err-><a class="code" href="structnlmsgerr.html#ad74e54e113a2aefba0d2a3e0bb8a768d" title="Error code (errno number)">error</a>,
<a name="l00965"></a>00965 strerror(-err-><a class="code" href="structnlmsgerr.html#ad74e54e113a2aefba0d2a3e0bb8a768d" title="Error code (errno number)">error</a>));
<a name="l00966"></a>00966 fprintf(ofd, <span class="stringliteral">" [ORIGINAL MESSAGE] %Zu octets\n"</span>, <span class="keyword">sizeof</span>(*hdr));
<a name="l00967"></a>00967
<a name="l00968"></a>00968 errmsg = <a class="code" href="group__msg.html#gab89e1b4e969a091fed4ef851f3339756" title="Allocate a new netlink message and inherit netlink message header.">nlmsg_inherit</a>(&err-><a class="code" href="structnlmsgerr.html#acf3fb4d9ccd3f6a112347684e32dcb5a" title="Original netlink message causing the error.">msg</a>);
<a name="l00969"></a>00969 print_hdr(ofd, errmsg);
<a name="l00970"></a>00970 <a class="code" href="group__msg.html#ga138ba9bee70553f9fbe7143deacad48c" title="Free a netlink message.">nlmsg_free</a>(errmsg);
<a name="l00971"></a>00971 } <span class="keywordflow">else</span> <span class="keywordflow">if</span> (<a class="code" href="group__msg.html#gafa0898e9ec7d59a8faa1e4f0ed3168bf" title="length of message payload">nlmsg_len</a>(hdr) > 0) {
<a name="l00972"></a>00972 <span class="keyword">struct </span><a class="code" href="structnl__cache__ops.html" title="Cache Operations.">nl_cache_ops</a> *ops;
<a name="l00973"></a>00973 <span class="keywordtype">int</span> payloadlen = <a class="code" href="group__msg.html#gafa0898e9ec7d59a8faa1e4f0ed3168bf" title="length of message payload">nlmsg_len</a>(hdr);
<a name="l00974"></a>00974 <span class="keywordtype">int</span> attrlen = 0;
<a name="l00975"></a>00975
<a name="l00976"></a>00976 ops = <a class="code" href="group__cache__mngt.html#ga92ddd84e94041733d8def0492b0afc1e" title="Associate a message type to a set of cache operations.">nl_cache_ops_associate</a>(nlmsg_get_proto(msg),
<a name="l00977"></a>00977 hdr-><a class="code" href="structnlmsghdr.html#a7232c4e6cb513010e64887b7eebf8823" title="Message type (content type)">nlmsg_type</a>);
<a name="l00978"></a>00978 <span class="keywordflow">if</span> (ops) {
<a name="l00979"></a>00979 attrlen = <a class="code" href="group__msg.html#gac9a4689d22aaa2f630476a7826f25fec" title="length of attributes data">nlmsg_attrlen</a>(hdr, ops->co_hdrsize);
<a name="l00980"></a>00980 payloadlen -= attrlen;
<a name="l00981"></a>00981 }
<a name="l00982"></a>00982
<a name="l00983"></a>00983 fprintf(ofd, <span class="stringliteral">" [PAYLOAD] %d octets\n"</span>, payloadlen);
<a name="l00984"></a>00984 dump_hex(ofd, <a class="code" href="group__msg.html#gae44a904bb40c8b5f5ff31539c21cfa5a" title="head of message payload">nlmsg_data</a>(hdr), payloadlen, 0);
<a name="l00985"></a>00985
<a name="l00986"></a>00986 <span class="keywordflow">if</span> (attrlen) {
<a name="l00987"></a>00987 <span class="keyword">struct </span>nlattr *attrs;
<a name="l00988"></a>00988 <span class="keywordtype">int</span> attrlen;
<a name="l00989"></a>00989
<a name="l00990"></a>00990 attrs = <a class="code" href="group__msg.html#ga203fdf0a4637e05df44de94c60d8e909" title="head of attributes data">nlmsg_attrdata</a>(hdr, ops->co_hdrsize);
<a name="l00991"></a>00991 attrlen = <a class="code" href="group__msg.html#gac9a4689d22aaa2f630476a7826f25fec" title="length of attributes data">nlmsg_attrlen</a>(hdr, ops->co_hdrsize);
<a name="l00992"></a>00992 dump_attrs(ofd, attrs, attrlen, 0);
<a name="l00993"></a>00993 }
<a name="l00994"></a>00994 }
<a name="l00995"></a>00995
<a name="l00996"></a>00996 fprintf(ofd,
<a name="l00997"></a>00997 <span class="stringliteral">"--------------------------- END NETLINK MESSAGE "</span>
<a name="l00998"></a>00998 <span class="stringliteral">"---------------------------\n"</span>);
<a name="l00999"></a>00999 }
<a name="l01000"></a>01000 <span class="comment"></span>
<a name="l01001"></a>01001 <span class="comment">/** @} */</span>
<a name="l01002"></a>01002 <span class="comment"></span>
<a name="l01003"></a>01003 <span class="comment">/** @} */</span>
</pre></div></div>
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