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<h1>lib/route/class.c</h1> </div>
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<div class="contents">
<div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="comment">/*</span>
<a name="l00002"></a>00002 <span class="comment"> * lib/route/class.c Queueing Classes</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 tc</span>
<a name="l00014"></a>00014 <span class="comment"> * @defgroup class Queueing Classes</span>
<a name="l00015"></a>00015 <span class="comment"> * @{</span>
<a name="l00016"></a>00016 <span class="comment"> */</span>
<a name="l00017"></a>00017
<a name="l00018"></a>00018 <span class="preprocessor">#include <netlink-local.h></span>
<a name="l00019"></a>00019 <span class="preprocessor">#include <netlink-tc.h></span>
<a name="l00020"></a>00020 <span class="preprocessor">#include <netlink/netlink.h></span>
<a name="l00021"></a>00021 <span class="preprocessor">#include <netlink/route/tc.h></span>
<a name="l00022"></a>00022 <span class="preprocessor">#include <netlink/route/class.h></span>
<a name="l00023"></a>00023 <span class="preprocessor">#include <netlink/route/class-modules.h></span>
<a name="l00024"></a>00024 <span class="preprocessor">#include <netlink/route/qdisc.h></span>
<a name="l00025"></a>00025 <span class="preprocessor">#include <netlink/route/classifier.h></span>
<a name="l00026"></a>00026 <span class="preprocessor">#include <netlink/utils.h></span>
<a name="l00027"></a>00027
<a name="l00028"></a>00028 <span class="keyword">static</span> <span class="keyword">struct </span><a class="code" href="structnl__cache__ops.html" title="Cache Operations.">nl_cache_ops</a> <a class="code" href="structrtnl__class__ops.html" title="Class operations.">rtnl_class_ops</a>;
<a name="l00029"></a>00029
<a name="l00030"></a>00030 <span class="keyword">static</span> <span class="keywordtype">int</span> class_msg_parser(<span class="keyword">struct</span> <a class="code" href="structnl__cache__ops.html" title="Cache Operations.">nl_cache_ops</a> *ops, <span class="keyword">struct</span> <a class="code" href="structsockaddr__nl.html" title="Netlink socket address.">sockaddr_nl</a> *who,
<a name="l00031"></a>00031 <span class="keyword">struct</span> <a class="code" href="structnlmsghdr.html" title="Netlink message header.">nlmsghdr</a> *n, <span class="keyword">struct</span> <a class="code" href="structnl__parser__param.html">nl_parser_param</a> *pp)
<a name="l00032"></a>00032 {
<a name="l00033"></a>00033 <span class="keywordtype">int</span> err;
<a name="l00034"></a>00034 <span class="keyword">struct </span>rtnl_class *<span class="keyword">class</span>;
<a name="l00035"></a>00035 <span class="keyword">struct </span><a class="code" href="structrtnl__class__ops.html" title="Class operations.">rtnl_class_ops</a> *cops;
<a name="l00036"></a>00036
<a name="l00037"></a>00037 <span class="keyword">class </span>= rtnl_class_alloc();
<a name="l00038"></a>00038 <span class="keywordflow">if</span> (!<span class="keyword">class</span>) {
<a name="l00039"></a>00039 err = nl_errno(ENOMEM);
<a name="l00040"></a>00040 <span class="keywordflow">goto</span> errout;
<a name="l00041"></a>00041 }
<a name="l00042"></a>00042 <span class="keyword">class</span>->ce_msgtype = n-><a class="code" href="structnlmsghdr.html#a7232c4e6cb513010e64887b7eebf8823" title="Message type (content type)">nlmsg_type</a>;
<a name="l00043"></a>00043
<a name="l00044"></a>00044 err = tca_msg_parser(n, (<span class="keyword">struct</span> rtnl_tca *) <span class="keyword">class</span>);
<a name="l00045"></a>00045 <span class="keywordflow">if</span> (err < 0)
<a name="l00046"></a>00046 <span class="keywordflow">goto</span> errout_free;
<a name="l00047"></a>00047
<a name="l00048"></a>00048 cops = <a class="code" href="group__class__api.html#ga13a2a79684317e5ccffff7dc89f79ab6" title="Lookup class operations for a class object.">rtnl_class_lookup_ops</a>(<span class="keyword">class</span>);
<a name="l00049"></a>00049 <span class="keywordflow">if</span> (cops && cops-><a class="code" href="structrtnl__class__ops.html#a826c84a8912a0728b7fb5c7cb609978a" title="TCA_OPTIONS message parser.">co_msg_parser</a>) {
<a name="l00050"></a>00050 err = cops-><a class="code" href="structrtnl__class__ops.html#a826c84a8912a0728b7fb5c7cb609978a" title="TCA_OPTIONS message parser.">co_msg_parser</a>(<span class="keyword">class</span>);
<a name="l00051"></a>00051 <span class="keywordflow">if</span> (err < 0)
<a name="l00052"></a>00052 <span class="keywordflow">goto</span> errout_free;
<a name="l00053"></a>00053 }
<a name="l00054"></a>00054
<a name="l00055"></a>00055 err = pp->pp_cb((<span class="keyword">struct</span> nl_object *) <span class="keyword">class</span>, pp);
<a name="l00056"></a>00056 <span class="keywordflow">if</span> (err < 0)
<a name="l00057"></a>00057 <span class="keywordflow">goto</span> errout_free;
<a name="l00058"></a>00058
<a name="l00059"></a>00059 err = P_ACCEPT;
<a name="l00060"></a>00060
<a name="l00061"></a>00061 errout_free:
<a name="l00062"></a>00062 rtnl_class_put(<span class="keyword">class</span>);
<a name="l00063"></a>00063 errout:
<a name="l00064"></a>00064 <span class="keywordflow">return</span> err;
<a name="l00065"></a>00065 }
<a name="l00066"></a>00066
<a name="l00067"></a>00067 <span class="keyword">static</span> <span class="keywordtype">int</span> class_request_update(<span class="keyword">struct</span> nl_cache *cache,
<a name="l00068"></a>00068 <span class="keyword">struct</span> nl_handle *handle)
<a name="l00069"></a>00069 {
<a name="l00070"></a>00070 <span class="keyword">struct </span>tcmsg tchdr = {
<a name="l00071"></a>00071 .tcm_family = AF_UNSPEC,
<a name="l00072"></a>00072 .tcm_ifindex = cache->c_iarg1,
<a name="l00073"></a>00073 };
<a name="l00074"></a>00074
<a name="l00075"></a>00075 <span class="keywordflow">return</span> <a class="code" href="group__nl.html#ga73ed88a505f2d67bcf328183fe1e692a" title="Send simple netlink message using nl_send_auto_complete()">nl_send_simple</a>(handle, RTM_GETTCLASS, <a class="code" href="group__msg.html#ga8d4fb2458c013decb6673f41c52c07b1" title="Dump all entries.">NLM_F_DUMP</a>, &tchdr,
<a name="l00076"></a>00076 <span class="keyword">sizeof</span>(tchdr));
<a name="l00077"></a>00077 }
<a name="l00078"></a>00078 <span class="comment"></span>
<a name="l00079"></a>00079 <span class="comment">/**</span>
<a name="l00080"></a>00080 <span class="comment"> * @name Addition/Modification</span>
<a name="l00081"></a>00081 <span class="comment"> * @{</span>
<a name="l00082"></a>00082 <span class="comment"> */</span>
<a name="l00083"></a>00083
<a name="l00084"></a>00084 <span class="keyword">static</span> <span class="keyword">struct </span>nl_msg *class_build(<span class="keyword">struct</span> rtnl_class *<span class="keyword">class</span>, <span class="keywordtype">int</span> type, <span class="keywordtype">int</span> flags)
<a name="l00085"></a>00085 {
<a name="l00086"></a>00086 <span class="keyword">struct </span><a class="code" href="structrtnl__class__ops.html" title="Class operations.">rtnl_class_ops</a> *cops;
<a name="l00087"></a>00087 <span class="keyword">struct </span>nl_msg *msg;
<a name="l00088"></a>00088 <span class="keywordtype">int</span> err;
<a name="l00089"></a>00089
<a name="l00090"></a>00090 msg = tca_build_msg((<span class="keyword">struct</span> rtnl_tca *) <span class="keyword">class</span>, type, flags);
<a name="l00091"></a>00091 <span class="keywordflow">if</span> (!msg)
<a name="l00092"></a>00092 <span class="keywordflow">goto</span> errout;
<a name="l00093"></a>00093
<a name="l00094"></a>00094 cops = <a class="code" href="group__class__api.html#ga13a2a79684317e5ccffff7dc89f79ab6" title="Lookup class operations for a class object.">rtnl_class_lookup_ops</a>(<span class="keyword">class</span>);
<a name="l00095"></a>00095 <span class="keywordflow">if</span> (cops && cops-><a class="code" href="structrtnl__class__ops.html#ae9071029c1487fbeaef56a6580c0594c" title="Must return the contents supposed to be in TCA_OPTIONS.">co_get_opts</a>) {
<a name="l00096"></a>00096 <span class="keyword">struct </span>nl_msg *opts;
<a name="l00097"></a>00097
<a name="l00098"></a>00098 opts = cops-><a class="code" href="structrtnl__class__ops.html#ae9071029c1487fbeaef56a6580c0594c" title="Must return the contents supposed to be in TCA_OPTIONS.">co_get_opts</a>(<span class="keyword">class</span>);
<a name="l00099"></a>00099 <span class="keywordflow">if</span> (opts) {
<a name="l00100"></a>00100 err = <a class="code" href="group__attr.html#gafe7bad603c92ecee0dfc0cc112dd1182" title="Add a nested netlink attribute to a netlink message.">nla_put_nested</a>(msg, TCA_OPTIONS, opts);
<a name="l00101"></a>00101 <a class="code" href="group__msg.html#ga138ba9bee70553f9fbe7143deacad48c" title="Free a netlink message.">nlmsg_free</a>(opts);
<a name="l00102"></a>00102 <span class="keywordflow">if</span> (err < 0)
<a name="l00103"></a>00103 <span class="keywordflow">goto</span> errout;
<a name="l00104"></a>00104 }
<a name="l00105"></a>00105 }
<a name="l00106"></a>00106
<a name="l00107"></a>00107 <span class="keywordflow">return</span> msg;
<a name="l00108"></a>00108 errout:
<a name="l00109"></a>00109 <a class="code" href="group__msg.html#ga138ba9bee70553f9fbe7143deacad48c" title="Free a netlink message.">nlmsg_free</a>(msg);
<a name="l00110"></a>00110 <span class="keywordflow">return</span> NULL;
<a name="l00111"></a>00111 }
<a name="l00112"></a>00112 <span class="comment"></span>
<a name="l00113"></a>00113 <span class="comment">/**</span>
<a name="l00114"></a>00114 <span class="comment"> * Build a netlink message to add a new class</span>
<a name="l00115"></a>00115 <span class="comment"> * @arg class class to add </span>
<a name="l00116"></a>00116 <span class="comment"> * @arg flags additional netlink message flags</span>
<a name="l00117"></a>00117 <span class="comment"> *</span>
<a name="l00118"></a>00118 <span class="comment"> * Builds a new netlink message requesting an addition of a class.</span>
<a name="l00119"></a>00119 <span class="comment"> * The netlink message header isn't fully equipped with all relevant</span>
<a name="l00120"></a>00120 <span class="comment"> * fields and must be sent out via nl_send_auto_complete() or</span>
<a name="l00121"></a>00121 <span class="comment"> * supplemented as needed. </span>
<a name="l00122"></a>00122 <span class="comment"> *</span>
<a name="l00123"></a>00123 <span class="comment"> * Common message flags</span>
<a name="l00124"></a>00124 <span class="comment"> * - NLM_F_REPLACE - replace possibly existing classes</span>
<a name="l00125"></a>00125 <span class="comment"> *</span>
<a name="l00126"></a>00126 <span class="comment"> * @return New netlink message</span>
<a name="l00127"></a>00127 <span class="comment"> */</span>
<a name="l00128"></a><a class="code" href="group__class.html#gaee9fa72dc9c7b63c65f0c05126a71a2e">00128</a> <span class="keyword">struct </span>nl_msg *<a class="code" href="group__class.html#gaee9fa72dc9c7b63c65f0c05126a71a2e" title="Build a netlink message to add a new class.">rtnl_class_build_add_request</a>(<span class="keyword">struct</span> rtnl_class *<span class="keyword">class</span>, <span class="keywordtype">int</span> flags)
<a name="l00129"></a>00129 {
<a name="l00130"></a>00130 <span class="keywordflow">return</span> class_build(<span class="keyword">class</span>, RTM_NEWTCLASS, <a class="code" href="group__msg.html#ga20a00ae52e4c150f54649d7346d23a7a" title="Create config object if it doesn&#39;t already exist.">NLM_F_CREATE</a> | flags);
<a name="l00131"></a>00131 }
<a name="l00132"></a>00132 <span class="comment"></span>
<a name="l00133"></a>00133 <span class="comment">/**</span>
<a name="l00134"></a>00134 <span class="comment"> * Add a new class</span>
<a name="l00135"></a>00135 <span class="comment"> * @arg handle netlink handle</span>
<a name="l00136"></a>00136 <span class="comment"> * @arg class class to delete</span>
<a name="l00137"></a>00137 <span class="comment"> * @arg flags additional netlink message flags</span>
<a name="l00138"></a>00138 <span class="comment"> *</span>
<a name="l00139"></a>00139 <span class="comment"> * Builds a netlink message by calling rtnl_qdisc_build_add_request(),</span>
<a name="l00140"></a>00140 <span class="comment"> * sends the request to the kernel and waits for the next ACK to be</span>
<a name="l00141"></a>00141 <span class="comment"> * received and thus blocks until the request has been processed.</span>
<a name="l00142"></a>00142 <span class="comment"> *</span>
<a name="l00143"></a>00143 <span class="comment"> * Common message flags</span>
<a name="l00144"></a>00144 <span class="comment"> * - NLM_F_REPLACE - replace possibly existing classes</span>
<a name="l00145"></a>00145 <span class="comment"> *</span>
<a name="l00146"></a>00146 <span class="comment"> * @return 0 on success or a negative error code</span>
<a name="l00147"></a>00147 <span class="comment"> */</span>
<a name="l00148"></a><a class="code" href="group__class.html#ga914ad78482317e0ca71f8d2c3194405e">00148</a> <span class="keywordtype">int</span> <a class="code" href="group__class.html#ga914ad78482317e0ca71f8d2c3194405e" title="Add a new class.">rtnl_class_add</a>(<span class="keyword">struct</span> nl_handle *handle, <span class="keyword">struct</span> rtnl_class *<span class="keyword">class</span>,
<a name="l00149"></a>00149 <span class="keywordtype">int</span> flags)
<a name="l00150"></a>00150 {
<a name="l00151"></a>00151 <span class="keyword">struct </span>nl_msg *msg;
<a name="l00152"></a>00152 <span class="keywordtype">int</span> err;
<a name="l00153"></a>00153
<a name="l00154"></a>00154 msg = <a class="code" href="group__class.html#gaee9fa72dc9c7b63c65f0c05126a71a2e" title="Build a netlink message to add a new class.">rtnl_class_build_add_request</a>(<span class="keyword">class</span>, flags);
<a name="l00155"></a>00155 <span class="keywordflow">if</span> (!msg)
<a name="l00156"></a>00156 <span class="keywordflow">return</span> nl_errno(ENOMEM);
<a name="l00157"></a>00157
<a name="l00158"></a>00158 err = <a class="code" href="group__nl.html#ga01a2aad82350f867e704d5c696438b60" title="Send netlink message and check &amp; extend header values as needed.">nl_send_auto_complete</a>(handle, msg);
<a name="l00159"></a>00159 <span class="keywordflow">if</span> (err < 0)
<a name="l00160"></a>00160 <span class="keywordflow">return</span> err;
<a name="l00161"></a>00161
<a name="l00162"></a>00162 <a class="code" href="group__msg.html#ga138ba9bee70553f9fbe7143deacad48c" title="Free a netlink message.">nlmsg_free</a>(msg);
<a name="l00163"></a>00163 <span class="keywordflow">return</span> <a class="code" href="group__nl.html#gaa65fec588e0a0a2de1881fb8366ccd79" title="Wait for ACK.">nl_wait_for_ack</a>(handle);
<a name="l00164"></a>00164 }
<a name="l00165"></a>00165 <span class="comment"></span>
<a name="l00166"></a>00166 <span class="comment">/** @} */</span>
<a name="l00167"></a>00167 <span class="comment"></span>
<a name="l00168"></a>00168 <span class="comment">/**</span>
<a name="l00169"></a>00169 <span class="comment"> * @name Cache Management</span>
<a name="l00170"></a>00170 <span class="comment"> * @{</span>
<a name="l00171"></a>00171 <span class="comment"> */</span>
<a name="l00172"></a>00172 <span class="comment"></span>
<a name="l00173"></a>00173 <span class="comment">/**</span>
<a name="l00174"></a>00174 <span class="comment"> * Build a class cache including all classes attached to the specified interface</span>
<a name="l00175"></a>00175 <span class="comment"> * @arg handle netlink handle</span>
<a name="l00176"></a>00176 <span class="comment"> * @arg ifindex interface index of the link the classes are</span>
<a name="l00177"></a>00177 <span class="comment"> * attached to.</span>
<a name="l00178"></a>00178 <span class="comment"> *</span>
<a name="l00179"></a>00179 <span class="comment"> * Allocates a new cache, initializes it properly and updates it to</span>
<a name="l00180"></a>00180 <span class="comment"> * include all classes attached to the specified interface.</span>
<a name="l00181"></a>00181 <span class="comment"> *</span>
<a name="l00182"></a>00182 <span class="comment"> * @return The cache or NULL if an error has occured.</span>
<a name="l00183"></a>00183 <span class="comment"> */</span>
<a name="l00184"></a><a class="code" href="group__class.html#ga790189e50d3eb1799bdbcd79bbbf8b85">00184</a> <span class="keyword">struct </span>nl_cache * <a class="code" href="group__class.html#ga790189e50d3eb1799bdbcd79bbbf8b85" title="Build a class cache including all classes attached to the specified interface.">rtnl_class_alloc_cache</a>(<span class="keyword">struct</span> nl_handle *handle, <span class="keywordtype">int</span> ifindex)
<a name="l00185"></a>00185 {
<a name="l00186"></a>00186 <span class="keyword">struct </span>nl_cache * cache;
<a name="l00187"></a>00187
<a name="l00188"></a>00188 cache = <a class="code" href="group__cache.html#ga9520ae0f2158db3c081f34c851d92252" title="Allocate an empty cache.">nl_cache_alloc</a>(&<a class="code" href="structrtnl__class__ops.html" title="Class operations.">rtnl_class_ops</a>);
<a name="l00189"></a>00189 <span class="keywordflow">if</span> (!cache)
<a name="l00190"></a>00190 <span class="keywordflow">return</span> NULL;
<a name="l00191"></a>00191
<a name="l00192"></a>00192 cache->c_iarg1 = ifindex;
<a name="l00193"></a>00193
<a name="l00194"></a>00194 <span class="keywordflow">if</span> (handle && <a class="code" href="group__cache.html#gaf5bd584017847e6ef69ec36739a6aaf0" title="(Re)fill a cache with the contents in the kernel.">nl_cache_refill</a>(handle, cache) < 0) {
<a name="l00195"></a>00195 <a class="code" href="group__cache.html#ga530c896db26d72001d011114b1e6cfaa" title="Free a cache.">nl_cache_free</a>(cache);
<a name="l00196"></a>00196 <span class="keywordflow">return</span> NULL;
<a name="l00197"></a>00197 }
<a name="l00198"></a>00198
<a name="l00199"></a>00199 <span class="keywordflow">return</span> cache;
<a name="l00200"></a>00200 }
<a name="l00201"></a>00201 <span class="comment"></span>
<a name="l00202"></a>00202 <span class="comment">/** @} */</span>
<a name="l00203"></a>00203
<a name="l00204"></a>00204 <span class="keyword">static</span> <span class="keyword">struct </span><a class="code" href="structnl__cache__ops.html" title="Cache Operations.">nl_cache_ops</a> <a class="code" href="structrtnl__class__ops.html" title="Class operations.">rtnl_class_ops</a> = {
<a name="l00205"></a>00205 .co_name = <span class="stringliteral">"route/class"</span>,
<a name="l00206"></a>00206 .co_hdrsize = <span class="keyword">sizeof</span>(<span class="keyword">struct </span>tcmsg),
<a name="l00207"></a>00207 .co_msgtypes = {
<a name="l00208"></a>00208 { RTM_NEWTCLASS, NL_ACT_NEW, <span class="stringliteral">"new"</span> },
<a name="l00209"></a>00209 { RTM_DELTCLASS, NL_ACT_DEL, <span class="stringliteral">"del"</span> },
<a name="l00210"></a>00210 { RTM_GETTCLASS, NL_ACT_GET, <span class="stringliteral">"get"</span> },
<a name="l00211"></a>00211 END_OF_MSGTYPES_LIST,
<a name="l00212"></a>00212 },
<a name="l00213"></a>00213 .co_protocol = NETLINK_ROUTE,
<a name="l00214"></a>00214 .co_request_update = &class_request_update,
<a name="l00215"></a>00215 .co_msg_parser = &class_msg_parser,
<a name="l00216"></a>00216 .co_obj_ops = &class_obj_ops,
<a name="l00217"></a>00217 };
<a name="l00218"></a>00218
<a name="l00219"></a>00219 <span class="keyword">static</span> <span class="keywordtype">void</span> __init class_init(<span class="keywordtype">void</span>)
<a name="l00220"></a>00220 {
<a name="l00221"></a>00221 <a class="code" href="group__cache__mngt.html#ga390eeb1fa61634cf1c216792c6df63c3" title="Register a set of cache operations.">nl_cache_mngt_register</a>(&rtnl_class_ops);
<a name="l00222"></a>00222 }
<a name="l00223"></a>00223
<a name="l00224"></a>00224 <span class="keyword">static</span> <span class="keywordtype">void</span> __exit class_exit(<span class="keywordtype">void</span>)
<a name="l00225"></a>00225 {
<a name="l00226"></a>00226 <a class="code" href="group__cache__mngt.html#ga09f56b767b3868b7e0cf8559863dde77" title="Unregister a set of cache operations.">nl_cache_mngt_unregister</a>(&rtnl_class_ops);
<a name="l00227"></a>00227 }
<a name="l00228"></a>00228 <span class="comment"></span>
<a name="l00229"></a>00229 <span class="comment">/** @} */</span>
</pre></div></div>
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