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<h1>lib/route/qdisc.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/route/qdisc.c Queueing Disciplines</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 qdisc Queueing Disciplines</span>
<a name="l00015"></a>00015 <span class="comment"> *</span>
<a name="l00016"></a>00016 <span class="comment"> * @par Qdisc Handles</span>
<a name="l00017"></a>00017 <span class="comment"> * In general, qdiscs are identified by the major part of a traffic control</span>
<a name="l00018"></a>00018 <span class="comment"> * handle (the upper 16 bits). A few special values exist though:</span>
<a name="l00019"></a>00019 <span class="comment"> * - \c TC_H_ROOT: root qdisc (directly attached to the device)</span>
<a name="l00020"></a>00020 <span class="comment"> * - \c TC_H_INGRESS: ingress qdisc (directly attached to the device)</span>
<a name="l00021"></a>00021 <span class="comment"> * - \c TC_H_UNSPEC: unspecified qdisc (no reference)</span>
<a name="l00022"></a>00022 <span class="comment"> *</span>
<a name="l00023"></a>00023 <span class="comment"> * @par 1) Adding a Qdisc</span>
<a name="l00024"></a>00024 <span class="comment"> * @code</span>
<a name="l00025"></a>00025 <span class="comment"> * // Allocate a new empty qdisc to be filled out</span>
<a name="l00026"></a>00026 <span class="comment"> * struct rtnl_qdisc *qdisc = rtnl_qdisc_alloc();</span>
<a name="l00027"></a>00027 <span class="comment"> *</span>
<a name="l00028"></a>00028 <span class="comment"> * // ... specify the kind of the Qdisc</span>
<a name="l00029"></a>00029 <span class="comment"> * rtnl_qdisc_set_kind(qdisc, "pfifo");</span>
<a name="l00030"></a>00030 <span class="comment"> *</span>
<a name="l00031"></a>00031 <span class="comment"> * // Specify the device the qdisc should be attached to</span>
<a name="l00032"></a>00032 <span class="comment"> * rtnl_qdisc_set_ifindex(qdisc, ifindex);</span>
<a name="l00033"></a>00033 <span class="comment"> *</span>
<a name="l00034"></a>00034 <span class="comment"> * // ... specify the parent qdisc</span>
<a name="l00035"></a>00035 <span class="comment"> * rtnl_qdisc_set_parent(qdisc, TC_H_ROOT);</span>
<a name="l00036"></a>00036 <span class="comment"> *</span>
<a name="l00037"></a>00037 <span class="comment"> * // Specifying the handle is not required but makes reidentifying easier</span>
<a name="l00038"></a>00038 <span class="comment"> * // and may help to avoid adding a qdisc twice.</span>
<a name="l00039"></a>00039 <span class="comment"> * rtnl_qdisc_set_handle(qdisc, 0x000A0000);</span>
<a name="l00040"></a>00040 <span class="comment"> *</span>
<a name="l00041"></a>00041 <span class="comment"> * // Now on to specify the qdisc specific options, see the relevant qdisc</span>
<a name="l00042"></a>00042 <span class="comment"> * // modules for documentation, in this example we set the upper limit of</span>
<a name="l00043"></a>00043 <span class="comment"> * // the packet fifo qdisc to 64</span>
<a name="l00044"></a>00044 <span class="comment"> * rtnl_qdisc_fifo_set_limit(qdisc, 64);</span>
<a name="l00045"></a>00045 <span class="comment"> *</span>
<a name="l00046"></a>00046 <span class="comment"> * rtnl_qdisc_add(handle, qdisc, NLM_R_REPLACE);</span>
<a name="l00047"></a>00047 <span class="comment"> *</span>
<a name="l00048"></a>00048 <span class="comment"> * // Free up the memory</span>
<a name="l00049"></a>00049 <span class="comment"> * rtnl_qdisc_put(qdisc);</span>
<a name="l00050"></a>00050 <span class="comment"> * @endcode</span>
<a name="l00051"></a>00051 <span class="comment"> *</span>
<a name="l00052"></a>00052 <span class="comment"> * @par 2) Deleting a Qdisc</span>
<a name="l00053"></a>00053 <span class="comment"> * @code</span>
<a name="l00054"></a>00054 <span class="comment"> * // Allocate a new empty qdisc to be filled out with the parameters</span>
<a name="l00055"></a>00055 <span class="comment"> * // specifying the qdisc to be deleted. Alternatively a fully equiped</span>
<a name="l00056"></a>00056 <span class="comment"> * // Qdisc object from a cache can be used.</span>
<a name="l00057"></a>00057 <span class="comment"> * struct rtnl_qdisc *qdisc = rtnl_qdisc_alloc();</span>
<a name="l00058"></a>00058 <span class="comment"> *</span>
<a name="l00059"></a>00059 <span class="comment"> * // The interface index of the device the qdisc is on and the parent handle</span>
<a name="l00060"></a>00060 <span class="comment"> * // are the least required fields to be filled out.</span>
<a name="l00061"></a>00061 <span class="comment"> * // Note: Specify TC_H_ROOT or TC_H_INGRESS as parent handle to delete the</span>
<a name="l00062"></a>00062 <span class="comment"> * // root respectively root ingress qdisc.</span>
<a name="l00063"></a>00063 <span class="comment"> * rtnl_qdisc_set_ifindex(qdisc, ifindex);</span>
<a name="l00064"></a>00064 <span class="comment"> * rtnl_qdisc_set_parent(qdisc, parent_handle);</span>
<a name="l00065"></a>00065 <span class="comment"> *</span>
<a name="l00066"></a>00066 <span class="comment"> * // If required for identification, the handle can be specified as well.</span>
<a name="l00067"></a>00067 <span class="comment"> * rtnl_qdisc_set_handle(qdisc, qdisc_handle);</span>
<a name="l00068"></a>00068 <span class="comment"> *</span>
<a name="l00069"></a>00069 <span class="comment"> * // Not required but maybe helpful as sanity check, the kind of the qdisc</span>
<a name="l00070"></a>00070 <span class="comment"> * // can be specified to avoid mistakes.</span>
<a name="l00071"></a>00071 <span class="comment"> * rtnl_qdisc_set_kind(qdisc, "pfifo");</span>
<a name="l00072"></a>00072 <span class="comment"> *</span>
<a name="l00073"></a>00073 <span class="comment"> * // Finally delete the qdisc with rtnl_qdisc_delete(), alternatively</span>
<a name="l00074"></a>00074 <span class="comment"> * // rtnl_qdisc_build_delete_request() can be invoked to generate an</span>
<a name="l00075"></a>00075 <span class="comment"> * // appropritate netlink message to send out.</span>
<a name="l00076"></a>00076 <span class="comment"> * rtnl_qdisc_delete(handle, qdisc);</span>
<a name="l00077"></a>00077 <span class="comment"> *</span>
<a name="l00078"></a>00078 <span class="comment"> * // Free up the memory</span>
<a name="l00079"></a>00079 <span class="comment"> * rtnl_qdisc_put(qdisc);</span>
<a name="l00080"></a>00080 <span class="comment"> * @endcode</span>
<a name="l00081"></a>00081 <span class="comment"> *</span>
<a name="l00082"></a>00082 <span class="comment"> * @{</span>
<a name="l00083"></a>00083 <span class="comment"> */</span>
<a name="l00084"></a>00084
<a name="l00085"></a>00085 <span class="preprocessor">#include <netlink-local.h></span>
<a name="l00086"></a>00086 <span class="preprocessor">#include <netlink-tc.h></span>
<a name="l00087"></a>00087 <span class="preprocessor">#include <netlink/netlink.h></span>
<a name="l00088"></a>00088 <span class="preprocessor">#include <netlink/utils.h></span>
<a name="l00089"></a>00089 <span class="preprocessor">#include <netlink/route/link.h></span>
<a name="l00090"></a>00090 <span class="preprocessor">#include <netlink/route/tc.h></span>
<a name="l00091"></a>00091 <span class="preprocessor">#include <netlink/route/qdisc.h></span>
<a name="l00092"></a>00092 <span class="preprocessor">#include <netlink/route/class.h></span>
<a name="l00093"></a>00093 <span class="preprocessor">#include <netlink/route/classifier.h></span>
<a name="l00094"></a>00094 <span class="preprocessor">#include <netlink/route/qdisc-modules.h></span>
<a name="l00095"></a>00095
<a name="l00096"></a>00096 <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__qdisc__ops.html" title="Qdisc Operations.">rtnl_qdisc_ops</a>;
<a name="l00097"></a>00097
<a name="l00098"></a>00098 <span class="keyword">static</span> <span class="keywordtype">int</span> qdisc_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="l00099"></a>00099 <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="l00100"></a>00100 {
<a name="l00101"></a>00101 <span class="keywordtype">int</span> err = -ENOMEM;
<a name="l00102"></a>00102 <span class="keyword">struct </span>rtnl_qdisc *qdisc;
<a name="l00103"></a>00103 <span class="keyword">struct </span><a class="code" href="structrtnl__qdisc__ops.html" title="Qdisc Operations.">rtnl_qdisc_ops</a> *qops;
<a name="l00104"></a>00104
<a name="l00105"></a>00105 qdisc = rtnl_qdisc_alloc();
<a name="l00106"></a>00106 <span class="keywordflow">if</span> (!qdisc) {
<a name="l00107"></a>00107 err = nl_errno(ENOMEM);
<a name="l00108"></a>00108 <span class="keywordflow">goto</span> errout;
<a name="l00109"></a>00109 }
<a name="l00110"></a>00110
<a name="l00111"></a>00111 qdisc->ce_msgtype = n-><a class="code" href="structnlmsghdr.html#a7232c4e6cb513010e64887b7eebf8823" title="Message type (content type)">nlmsg_type</a>;
<a name="l00112"></a>00112
<a name="l00113"></a>00113 err = tca_msg_parser(n, (<span class="keyword">struct</span> rtnl_tca *) qdisc);
<a name="l00114"></a>00114 <span class="keywordflow">if</span> (err < 0)
<a name="l00115"></a>00115 <span class="keywordflow">goto</span> errout_free;
<a name="l00116"></a>00116
<a name="l00117"></a>00117 qops = rtnl_qdisc_lookup_ops(qdisc);
<a name="l00118"></a>00118 <span class="keywordflow">if</span> (qops && qops-><a class="code" href="structrtnl__qdisc__ops.html#a5a7571f7b39462b25f57119a1879322d" title="TCA_OPTIONS message parser.">qo_msg_parser</a>) {
<a name="l00119"></a>00119 err = qops-><a class="code" href="structrtnl__qdisc__ops.html#a5a7571f7b39462b25f57119a1879322d" title="TCA_OPTIONS message parser.">qo_msg_parser</a>(qdisc);
<a name="l00120"></a>00120 <span class="keywordflow">if</span> (err < 0)
<a name="l00121"></a>00121 <span class="keywordflow">goto</span> errout_free;
<a name="l00122"></a>00122 }
<a name="l00123"></a>00123
<a name="l00124"></a>00124 err = pp->pp_cb((<span class="keyword">struct</span> nl_object *) qdisc, pp);
<a name="l00125"></a>00125 <span class="keywordflow">if</span> (err < 0)
<a name="l00126"></a>00126 <span class="keywordflow">goto</span> errout_free;
<a name="l00127"></a>00127
<a name="l00128"></a>00128 err = P_ACCEPT;
<a name="l00129"></a>00129
<a name="l00130"></a>00130 errout_free:
<a name="l00131"></a>00131 rtnl_qdisc_put(qdisc);
<a name="l00132"></a>00132 errout:
<a name="l00133"></a>00133 <span class="keywordflow">return</span> err;
<a name="l00134"></a>00134 }
<a name="l00135"></a>00135
<a name="l00136"></a>00136 <span class="keyword">static</span> <span class="keywordtype">int</span> qdisc_request_update(<span class="keyword">struct</span> nl_cache *c, <span class="keyword">struct</span> nl_handle *h)
<a name="l00137"></a>00137 {
<a name="l00138"></a>00138 <span class="keyword">struct </span>tcmsg tchdr = {
<a name="l00139"></a>00139 .tcm_family = AF_UNSPEC,
<a name="l00140"></a>00140 .tcm_ifindex = c->c_iarg1,
<a name="l00141"></a>00141 };
<a name="l00142"></a>00142
<a name="l00143"></a>00143 <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>(h, RTM_GETQDISC, <a class="code" href="group__msg.html#ga8d4fb2458c013decb6673f41c52c07b1" title="Dump all entries.">NLM_F_DUMP</a>, &tchdr,
<a name="l00144"></a>00144 <span class="keyword">sizeof</span>(tchdr));
<a name="l00145"></a>00145 }
<a name="l00146"></a>00146 <span class="comment"></span>
<a name="l00147"></a>00147 <span class="comment">/**</span>
<a name="l00148"></a>00148 <span class="comment"> * @name QDisc Addition</span>
<a name="l00149"></a>00149 <span class="comment"> * @{</span>
<a name="l00150"></a>00150 <span class="comment"> */</span>
<a name="l00151"></a>00151
<a name="l00152"></a>00152 <span class="keyword">static</span> <span class="keyword">struct </span>nl_msg *qdisc_build(<span class="keyword">struct</span> rtnl_qdisc *qdisc, <span class="keywordtype">int</span> type, <span class="keywordtype">int</span> flags)
<a name="l00153"></a>00153 {
<a name="l00154"></a>00154 <span class="keyword">struct </span><a class="code" href="structrtnl__qdisc__ops.html" title="Qdisc Operations.">rtnl_qdisc_ops</a> *qops;
<a name="l00155"></a>00155 <span class="keyword">struct </span>nl_msg *msg;
<a name="l00156"></a>00156 <span class="keywordtype">int</span> err;
<a name="l00157"></a>00157
<a name="l00158"></a>00158 msg = tca_build_msg((<span class="keyword">struct</span> rtnl_tca *) qdisc, type, flags);
<a name="l00159"></a>00159 <span class="keywordflow">if</span> (!msg)
<a name="l00160"></a>00160 <span class="keywordflow">goto</span> errout;
<a name="l00161"></a>00161
<a name="l00162"></a>00162 qops = rtnl_qdisc_lookup_ops(qdisc);
<a name="l00163"></a>00163 <span class="keywordflow">if</span> (qops && qops-><a class="code" href="structrtnl__qdisc__ops.html#a2b2fb4f82322e8e98729de80992da852" title="Must return the contents supposed to be in TCA_OPTIONS.">qo_get_opts</a>) {
<a name="l00164"></a>00164 <span class="keyword">struct </span>nl_msg *opts;
<a name="l00165"></a>00165
<a name="l00166"></a>00166 opts = qops-><a class="code" href="structrtnl__qdisc__ops.html#a2b2fb4f82322e8e98729de80992da852" title="Must return the contents supposed to be in TCA_OPTIONS.">qo_get_opts</a>(qdisc);
<a name="l00167"></a>00167 <span class="keywordflow">if</span> (opts) {
<a name="l00168"></a>00168 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="l00169"></a>00169 <a class="code" href="group__msg.html#ga138ba9bee70553f9fbe7143deacad48c" title="Free a netlink message.">nlmsg_free</a>(opts);
<a name="l00170"></a>00170 <span class="keywordflow">if</span> (err < 0)
<a name="l00171"></a>00171 <span class="keywordflow">goto</span> errout;
<a name="l00172"></a>00172 }
<a name="l00173"></a>00173 }
<a name="l00174"></a>00174
<a name="l00175"></a>00175 <span class="keywordflow">return</span> msg;
<a name="l00176"></a>00176 errout:
<a name="l00177"></a>00177 <a class="code" href="group__msg.html#ga138ba9bee70553f9fbe7143deacad48c" title="Free a netlink message.">nlmsg_free</a>(msg);
<a name="l00178"></a>00178
<a name="l00179"></a>00179 <span class="keywordflow">return</span> NULL;
<a name="l00180"></a>00180 }
<a name="l00181"></a>00181 <span class="comment"></span>
<a name="l00182"></a>00182 <span class="comment">/**</span>
<a name="l00183"></a>00183 <span class="comment"> * Build a netlink message to add a new qdisc</span>
<a name="l00184"></a>00184 <span class="comment"> * @arg qdisc qdisc to add </span>
<a name="l00185"></a>00185 <span class="comment"> * @arg flags additional netlink message flags</span>
<a name="l00186"></a>00186 <span class="comment"> *</span>
<a name="l00187"></a>00187 <span class="comment"> * Builds a new netlink message requesting an addition of a qdisc.</span>
<a name="l00188"></a>00188 <span class="comment"> * The netlink message header isn't fully equipped with all relevant</span>
<a name="l00189"></a>00189 <span class="comment"> * fields and must be sent out via nl_send_auto_complete() or</span>
<a name="l00190"></a>00190 <span class="comment"> * supplemented as needed. </span>
<a name="l00191"></a>00191 <span class="comment"> *</span>
<a name="l00192"></a>00192 <span class="comment"> * Common message flags used:</span>
<a name="l00193"></a>00193 <span class="comment"> * - NLM_F_REPLACE - replace a potential existing qdisc</span>
<a name="l00194"></a>00194 <span class="comment"> *</span>
<a name="l00195"></a>00195 <span class="comment"> * @return New netlink message</span>
<a name="l00196"></a>00196 <span class="comment"> */</span>
<a name="l00197"></a><a class="code" href="group__qdisc.html#ga863dae227b2c7cb28475f10b2934e114">00197</a> <span class="keyword">struct </span>nl_msg *<a class="code" href="group__qdisc.html#ga863dae227b2c7cb28475f10b2934e114" title="Build a netlink message to add a new qdisc.">rtnl_qdisc_build_add_request</a>(<span class="keyword">struct</span> rtnl_qdisc *qdisc,
<a name="l00198"></a>00198 <span class="keywordtype">int</span> flags)
<a name="l00199"></a>00199 {
<a name="l00200"></a>00200 <span class="keyword">struct </span>nl_msg *msg;
<a name="l00201"></a>00201
<a name="l00202"></a>00202 msg = qdisc_build(qdisc, RTM_NEWQDISC, <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="l00203"></a>00203 <span class="keywordflow">if</span> (!msg)
<a name="l00204"></a>00204 nl_errno(ENOMEM);
<a name="l00205"></a>00205
<a name="l00206"></a>00206 <span class="keywordflow">return</span> msg;
<a name="l00207"></a>00207 }
<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"> * Add a new qdisc</span>
<a name="l00211"></a>00211 <span class="comment"> * @arg handle netlink handle</span>
<a name="l00212"></a>00212 <span class="comment"> * @arg qdisc qdisc to delete</span>
<a name="l00213"></a>00213 <span class="comment"> * @arg flags additional netlink message flags</span>
<a name="l00214"></a>00214 <span class="comment"> *</span>
<a name="l00215"></a>00215 <span class="comment"> * Builds a netlink message by calling rtnl_qdisc_build_add_request(),</span>
<a name="l00216"></a>00216 <span class="comment"> * sends the request to the kernel and waits for the ACK to be</span>
<a name="l00217"></a>00217 <span class="comment"> * received and thus blocks until the request has been processed.</span>
<a name="l00218"></a>00218 <span class="comment"> *</span>
<a name="l00219"></a>00219 <span class="comment"> * Common message flags used:</span>
<a name="l00220"></a>00220 <span class="comment"> * - NLM_F_REPLACE - replace a potential existing qdisc</span>
<a name="l00221"></a>00221 <span class="comment"> *</span>
<a name="l00222"></a>00222 <span class="comment"> * @return 0 on success or a negative error code</span>
<a name="l00223"></a>00223 <span class="comment"> */</span>
<a name="l00224"></a><a class="code" href="group__qdisc.html#ga4d475717e86a26b929fe4cf04e76d1e6">00224</a> <span class="keywordtype">int</span> <a class="code" href="group__qdisc.html#ga4d475717e86a26b929fe4cf04e76d1e6" title="Add a new qdisc.">rtnl_qdisc_add</a>(<span class="keyword">struct</span> nl_handle *handle, <span class="keyword">struct</span> rtnl_qdisc *qdisc,
<a name="l00225"></a>00225 <span class="keywordtype">int</span> flags)
<a name="l00226"></a>00226 {
<a name="l00227"></a>00227 <span class="keyword">struct </span>nl_msg *msg;
<a name="l00228"></a>00228 <span class="keywordtype">int</span> err;
<a name="l00229"></a>00229
<a name="l00230"></a>00230 msg = <a class="code" href="group__qdisc.html#ga863dae227b2c7cb28475f10b2934e114" title="Build a netlink message to add a new qdisc.">rtnl_qdisc_build_add_request</a>(qdisc, flags);
<a name="l00231"></a>00231 <span class="keywordflow">if</span> (!msg)
<a name="l00232"></a>00232 <span class="keywordflow">return</span> nl_errno(ENOMEM);
<a name="l00233"></a>00233
<a name="l00234"></a>00234 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="l00235"></a>00235 <span class="keywordflow">if</span> (err < 0)
<a name="l00236"></a>00236 <span class="keywordflow">return</span> err;
<a name="l00237"></a>00237
<a name="l00238"></a>00238 <a class="code" href="group__msg.html#ga138ba9bee70553f9fbe7143deacad48c" title="Free a netlink message.">nlmsg_free</a>(msg);
<a name="l00239"></a>00239 <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="l00240"></a>00240 }
<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"> * @name QDisc Modification</span>
<a name="l00246"></a>00246 <span class="comment"> * @{</span>
<a name="l00247"></a>00247 <span class="comment"> */</span>
<a name="l00248"></a>00248 <span class="comment"></span>
<a name="l00249"></a>00249 <span class="comment">/**</span>
<a name="l00250"></a>00250 <span class="comment"> * Build a netlink message to change attributes of a existing qdisc</span>
<a name="l00251"></a>00251 <span class="comment"> * @arg qdisc qdisc to change</span>
<a name="l00252"></a>00252 <span class="comment"> * @arg new new qdisc attributes</span>
<a name="l00253"></a>00253 <span class="comment"> *</span>
<a name="l00254"></a>00254 <span class="comment"> * Builds a new netlink message requesting an change of qdisc</span>
<a name="l00255"></a>00255 <span class="comment"> * attributes. The netlink message header isn't fully equipped</span>
<a name="l00256"></a>00256 <span class="comment"> * with all relevant fields and must be sent out via</span>
<a name="l00257"></a>00257 <span class="comment"> * nl_send_auto_complete() or supplemented as needed. </span>
<a name="l00258"></a>00258 <span class="comment"> *</span>
<a name="l00259"></a>00259 <span class="comment"> * @return New netlink message</span>
<a name="l00260"></a>00260 <span class="comment"> */</span>
<a name="l00261"></a><a class="code" href="group__qdisc.html#gab34941a68da0c7cc1416c2d619d2b291">00261</a> <span class="keyword">struct </span>nl_msg *<a class="code" href="group__qdisc.html#gab34941a68da0c7cc1416c2d619d2b291" title="Build a netlink message to change attributes of a existing qdisc.">rtnl_qdisc_build_change_request</a>(<span class="keyword">struct</span> rtnl_qdisc *qdisc,
<a name="l00262"></a>00262 <span class="keyword">struct</span> rtnl_qdisc *<span class="keyword">new</span>)
<a name="l00263"></a>00263 {
<a name="l00264"></a>00264 <span class="keywordflow">return</span> qdisc_build(qdisc, RTM_NEWQDISC, <a class="code" href="group__msg.html#ga508feb1b826c0b8f6b2487c682ddb734" title="Replace existing matching config object with this request.">NLM_F_REPLACE</a>);
<a name="l00265"></a>00265 }
<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"> * Change attributes of a qdisc</span>
<a name="l00269"></a>00269 <span class="comment"> * @arg handle netlink handle</span>
<a name="l00270"></a>00270 <span class="comment"> * @arg qdisc qdisc to change</span>
<a name="l00271"></a>00271 <span class="comment"> * @arg new new qdisc attributes</span>
<a name="l00272"></a>00272 <span class="comment"> *</span>
<a name="l00273"></a>00273 <span class="comment"> * Builds a netlink message by calling rtnl_qdisc_build_change_request(),</span>
<a name="l00274"></a>00274 <span class="comment"> * sends the request to the kernel and waits for the ACK to be</span>
<a name="l00275"></a>00275 <span class="comment"> * received and thus blocks until the request has been processed.</span>
<a name="l00276"></a>00276 <span class="comment"> *</span>
<a name="l00277"></a>00277 <span class="comment"> * @return 0 on success or a negative error code</span>
<a name="l00278"></a>00278 <span class="comment"> */</span>
<a name="l00279"></a><a class="code" href="group__qdisc.html#ga8c9da85cd2e50a12491d940136379a6a">00279</a> <span class="keywordtype">int</span> <a class="code" href="group__qdisc.html#ga8c9da85cd2e50a12491d940136379a6a" title="Change attributes of a qdisc.">rtnl_qdisc_change</a>(<span class="keyword">struct</span> nl_handle *handle, <span class="keyword">struct</span> rtnl_qdisc *qdisc,
<a name="l00280"></a>00280 <span class="keyword">struct</span> rtnl_qdisc *<span class="keyword">new</span>)
<a name="l00281"></a>00281 {
<a name="l00282"></a>00282 <span class="keyword">struct </span>nl_msg *msg;
<a name="l00283"></a>00283 <span class="keywordtype">int</span> err;
<a name="l00284"></a>00284
<a name="l00285"></a>00285 msg = <a class="code" href="group__qdisc.html#gab34941a68da0c7cc1416c2d619d2b291" title="Build a netlink message to change attributes of a existing qdisc.">rtnl_qdisc_build_change_request</a>(qdisc, <span class="keyword">new</span>);
<a name="l00286"></a>00286 <span class="keywordflow">if</span> (!msg)
<a name="l00287"></a>00287 <span class="keywordflow">return</span> nl_errno(ENOMEM);
<a name="l00288"></a>00288
<a name="l00289"></a>00289 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="l00290"></a>00290 <span class="keywordflow">if</span> (err < 0)
<a name="l00291"></a>00291 <span class="keywordflow">return</span> err;
<a name="l00292"></a>00292
<a name="l00293"></a>00293 <a class="code" href="group__msg.html#ga138ba9bee70553f9fbe7143deacad48c" title="Free a netlink message.">nlmsg_free</a>(msg);
<a name="l00294"></a>00294 <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="l00295"></a>00295 }
<a name="l00296"></a>00296 <span class="comment"></span>
<a name="l00297"></a>00297 <span class="comment">/** @} */</span>
<a name="l00298"></a>00298 <span class="comment"></span>
<a name="l00299"></a>00299 <span class="comment">/**</span>
<a name="l00300"></a>00300 <span class="comment"> * @name QDisc Deletion</span>
<a name="l00301"></a>00301 <span class="comment"> * @{</span>
<a name="l00302"></a>00302 <span class="comment"> */</span>
<a name="l00303"></a>00303 <span class="comment"></span>
<a name="l00304"></a>00304 <span class="comment">/**</span>
<a name="l00305"></a>00305 <span class="comment"> * Build a netlink request message to delete a qdisc</span>
<a name="l00306"></a>00306 <span class="comment"> * @arg qdisc qdisc to delete</span>
<a name="l00307"></a>00307 <span class="comment"> *</span>
<a name="l00308"></a>00308 <span class="comment"> * Builds a new netlink message requesting a deletion of a qdisc.</span>
<a name="l00309"></a>00309 <span class="comment"> * The netlink message header isn't fully equipped with all relevant</span>
<a name="l00310"></a>00310 <span class="comment"> * fields and must thus be sent out via nl_send_auto_complete()</span>
<a name="l00311"></a>00311 <span class="comment"> * or supplemented as needed.</span>
<a name="l00312"></a>00312 <span class="comment"> *</span>
<a name="l00313"></a>00313 <span class="comment"> * @return New netlink message</span>
<a name="l00314"></a>00314 <span class="comment"> */</span>
<a name="l00315"></a><a class="code" href="group__qdisc.html#ga093a65cd211b1b475469a6568a5ef377">00315</a> <span class="keyword">struct </span>nl_msg *<a class="code" href="group__qdisc.html#ga093a65cd211b1b475469a6568a5ef377" title="Build a netlink request message to delete a qdisc.">rtnl_qdisc_build_delete_request</a>(<span class="keyword">struct</span> rtnl_qdisc *qdisc)
<a name="l00316"></a>00316 {
<a name="l00317"></a>00317 <span class="keyword">struct </span>nl_msg *msg;
<a name="l00318"></a>00318 <span class="keyword">struct </span>tcmsg tchdr;
<a name="l00319"></a>00319 <span class="keywordtype">int</span> required = TCA_ATTR_IFINDEX | TCA_ATTR_PARENT;
<a name="l00320"></a>00320
<a name="l00321"></a>00321 <span class="keywordflow">if</span> ((qdisc->ce_mask & required) != required)
<a name="l00322"></a>00322 BUG();
<a name="l00323"></a>00323
<a name="l00324"></a>00324 msg = <a class="code" href="group__msg.html#ga580d8697d19050c55060bc10ab4eae9f" title="Allocate a new netlink message.">nlmsg_alloc_simple</a>(RTM_DELQDISC, 0);
<a name="l00325"></a>00325 <span class="keywordflow">if</span> (!msg)
<a name="l00326"></a>00326 <span class="keywordflow">return</span> NULL;
<a name="l00327"></a>00327
<a name="l00328"></a>00328 tchdr.tcm_family = AF_UNSPEC,
<a name="l00329"></a>00329 tchdr.tcm_handle = qdisc->q_handle,
<a name="l00330"></a>00330 tchdr.tcm_parent = qdisc->q_parent,
<a name="l00331"></a>00331 tchdr.tcm_ifindex = qdisc->q_ifindex,
<a name="l00332"></a>00332 <a class="code" href="group__msg.html#gacc5e5ade5675d041f86c7c8693f7088d" title="Append data to tail of a netlink message.">nlmsg_append</a>(msg, &tchdr, <span class="keyword">sizeof</span>(tchdr), NLMSG_ALIGNTO);
<a name="l00333"></a>00333
<a name="l00334"></a>00334 <span class="keywordflow">return</span> msg;
<a name="l00335"></a>00335 }
<a name="l00336"></a>00336 <span class="comment"></span>
<a name="l00337"></a>00337 <span class="comment">/**</span>
<a name="l00338"></a>00338 <span class="comment"> * Delete a qdisc</span>
<a name="l00339"></a>00339 <span class="comment"> * @arg handle netlink handle</span>
<a name="l00340"></a>00340 <span class="comment"> * @arg qdisc qdisc to delete</span>
<a name="l00341"></a>00341 <span class="comment"> *</span>
<a name="l00342"></a>00342 <span class="comment"> * Builds a netlink message by calling rtnl_qdisc_build_delete_request(),</span>
<a name="l00343"></a>00343 <span class="comment"> * sends the request to the kernel and waits for the ACK to be</span>
<a name="l00344"></a>00344 <span class="comment"> * received and thus blocks until the request has been processed.</span>
<a name="l00345"></a>00345 <span class="comment"> *</span>
<a name="l00346"></a>00346 <span class="comment"> * @return 0 on success or a negative error code</span>
<a name="l00347"></a>00347 <span class="comment"> */</span>
<a name="l00348"></a><a class="code" href="group__qdisc.html#ga9b930a7488d5e8b88e8f579a6380c85c">00348</a> <span class="keywordtype">int</span> <a class="code" href="group__qdisc.html#ga9b930a7488d5e8b88e8f579a6380c85c" title="Delete a qdisc.">rtnl_qdisc_delete</a>(<span class="keyword">struct</span> nl_handle *handle, <span class="keyword">struct</span> rtnl_qdisc *qdisc)
<a name="l00349"></a>00349 {
<a name="l00350"></a>00350 <span class="keyword">struct </span>nl_msg *msg;
<a name="l00351"></a>00351 <span class="keywordtype">int</span> err;
<a name="l00352"></a>00352
<a name="l00353"></a>00353 msg = <a class="code" href="group__qdisc.html#ga093a65cd211b1b475469a6568a5ef377" title="Build a netlink request message to delete a qdisc.">rtnl_qdisc_build_delete_request</a>(qdisc);
<a name="l00354"></a>00354 <span class="keywordflow">if</span> (!msg)
<a name="l00355"></a>00355 <span class="keywordflow">return</span> nl_errno(ENOMEM);
<a name="l00356"></a>00356
<a name="l00357"></a>00357 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="l00358"></a>00358 <span class="keywordflow">if</span> (err < 0)
<a name="l00359"></a>00359 <span class="keywordflow">return</span> err;
<a name="l00360"></a>00360
<a name="l00361"></a>00361 <a class="code" href="group__msg.html#ga138ba9bee70553f9fbe7143deacad48c" title="Free a netlink message.">nlmsg_free</a>(msg);
<a name="l00362"></a>00362 <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="l00363"></a>00363 }
<a name="l00364"></a>00364 <span class="comment"></span>
<a name="l00365"></a>00365 <span class="comment">/** @} */</span>
<a name="l00366"></a>00366 <span class="comment"></span>
<a name="l00367"></a>00367 <span class="comment">/**</span>
<a name="l00368"></a>00368 <span class="comment"> * @name Qdisc Cache Management</span>
<a name="l00369"></a>00369 <span class="comment"> * @{</span>
<a name="l00370"></a>00370 <span class="comment"> */</span>
<a name="l00371"></a>00371 <span class="comment"></span>
<a name="l00372"></a>00372 <span class="comment">/**</span>
<a name="l00373"></a>00373 <span class="comment"> * Build a qdisc cache including all qdiscs currently configured in</span>
<a name="l00374"></a>00374 <span class="comment"> * the kernel</span>
<a name="l00375"></a>00375 <span class="comment"> * @arg handle netlink handle</span>
<a name="l00376"></a>00376 <span class="comment"> *</span>
<a name="l00377"></a>00377 <span class="comment"> * Allocates a new cache, initializes it properly and updates it to</span>
<a name="l00378"></a>00378 <span class="comment"> * include all qdiscs currently configured in the kernel.</span>
<a name="l00379"></a>00379 <span class="comment"> *</span>
<a name="l00380"></a>00380 <span class="comment"> * @note The caller is responsible for destroying and freeing the</span>
<a name="l00381"></a>00381 <span class="comment"> * cache after using it.</span>
<a name="l00382"></a>00382 <span class="comment"> * @return The cache or NULL if an error has occured.</span>
<a name="l00383"></a>00383 <span class="comment"> */</span>
<a name="l00384"></a><a class="code" href="group__qdisc.html#ga66f21501cb2241b86a504038cdc197d5">00384</a> <span class="keyword">struct </span>nl_cache * <a class="code" href="group__qdisc.html#ga66f21501cb2241b86a504038cdc197d5" title="Build a qdisc cache including all qdiscs currently configured in the kernel.">rtnl_qdisc_alloc_cache</a>(<span class="keyword">struct</span> nl_handle *handle)
<a name="l00385"></a>00385 {
<a name="l00386"></a>00386 <span class="keyword">struct </span>nl_cache * cache;
<a name="l00387"></a>00387
<a name="l00388"></a>00388 cache = <a class="code" href="group__cache.html#ga9520ae0f2158db3c081f34c851d92252" title="Allocate an empty cache.">nl_cache_alloc</a>(&<a class="code" href="structrtnl__qdisc__ops.html" title="Qdisc Operations.">rtnl_qdisc_ops</a>);
<a name="l00389"></a>00389 <span class="keywordflow">if</span> (cache == NULL)
<a name="l00390"></a>00390 <span class="keywordflow">return</span> NULL;
<a name="l00391"></a>00391
<a name="l00392"></a>00392 <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="l00393"></a>00393 <a class="code" href="group__cache.html#ga530c896db26d72001d011114b1e6cfaa" title="Free a cache.">nl_cache_free</a>(cache);
<a name="l00394"></a>00394 <span class="keywordflow">return</span> NULL;
<a name="l00395"></a>00395 }
<a name="l00396"></a>00396
<a name="l00397"></a>00397 <span class="keywordflow">return</span> cache;
<a name="l00398"></a>00398 }
<a name="l00399"></a>00399 <span class="comment"></span>
<a name="l00400"></a>00400 <span class="comment">/**</span>
<a name="l00401"></a>00401 <span class="comment"> * Look up qdisc by its parent in the provided cache</span>
<a name="l00402"></a>00402 <span class="comment"> * @arg cache qdisc cache</span>
<a name="l00403"></a>00403 <span class="comment"> * @arg ifindex interface the qdisc is attached to</span>
<a name="l00404"></a>00404 <span class="comment"> * @arg parent parent handle</span>
<a name="l00405"></a>00405 <span class="comment"> * @return pointer to qdisc inside the cache or NULL if no match was found.</span>
<a name="l00406"></a>00406 <span class="comment"> */</span>
<a name="l00407"></a><a class="code" href="group__qdisc.html#gaa93df0077a2748e7464962e0e9dc968d">00407</a> <span class="keyword">struct </span>rtnl_qdisc * <a class="code" href="group__qdisc.html#gaa93df0077a2748e7464962e0e9dc968d" title="Look up qdisc by its parent in the provided cache.">rtnl_qdisc_get_by_parent</a>(<span class="keyword">struct</span> nl_cache *cache,
<a name="l00408"></a>00408 <span class="keywordtype">int</span> ifindex, uint32_t parent)
<a name="l00409"></a>00409 {
<a name="l00410"></a>00410 <span class="keyword">struct </span>rtnl_qdisc *q;
<a name="l00411"></a>00411
<a name="l00412"></a>00412 <span class="keywordflow">if</span> (cache->c_ops != &<a class="code" href="structrtnl__qdisc__ops.html" title="Qdisc Operations.">rtnl_qdisc_ops</a>)
<a name="l00413"></a>00413 <span class="keywordflow">return</span> NULL;
<a name="l00414"></a>00414
<a name="l00415"></a>00415 nl_list_for_each_entry(q, &cache->c_items, ce_list) {
<a name="l00416"></a>00416 <span class="keywordflow">if</span> (q->q_parent == parent && q->q_ifindex == ifindex) {
<a name="l00417"></a>00417 <a class="code" href="group__object.html#gabd5767ac47ec6f09d1ac643f44eb8bfd" title="Acquire a reference on a object.">nl_object_get</a>((<span class="keyword">struct</span> nl_object *) q);
<a name="l00418"></a>00418 <span class="keywordflow">return</span> q;
<a name="l00419"></a>00419 }
<a name="l00420"></a>00420 }
<a name="l00421"></a>00421
<a name="l00422"></a>00422 <span class="keywordflow">return</span> NULL;
<a name="l00423"></a>00423 }
<a name="l00424"></a>00424 <span class="comment"></span>
<a name="l00425"></a>00425 <span class="comment">/**</span>
<a name="l00426"></a>00426 <span class="comment"> * Look up qdisc by its handle in the provided cache</span>
<a name="l00427"></a>00427 <span class="comment"> * @arg cache qdisc cache</span>
<a name="l00428"></a>00428 <span class="comment"> * @arg ifindex interface the qdisc is attached to</span>
<a name="l00429"></a>00429 <span class="comment"> * @arg handle qdisc handle</span>
<a name="l00430"></a>00430 <span class="comment"> * @return pointer to qdisc inside the cache or NULL if no match was found.</span>
<a name="l00431"></a>00431 <span class="comment"> */</span>
<a name="l00432"></a><a class="code" href="group__qdisc.html#ga4b2e6e757746a12f752859bef79a17a3">00432</a> <span class="keyword">struct </span>rtnl_qdisc * <a class="code" href="group__qdisc.html#ga4b2e6e757746a12f752859bef79a17a3" title="Look up qdisc by its handle in the provided cache.">rtnl_qdisc_get</a>(<span class="keyword">struct</span> nl_cache *cache,
<a name="l00433"></a>00433 <span class="keywordtype">int</span> ifindex, uint32_t handle)
<a name="l00434"></a>00434 {
<a name="l00435"></a>00435 <span class="keyword">struct </span>rtnl_qdisc *q;
<a name="l00436"></a>00436
<a name="l00437"></a>00437 <span class="keywordflow">if</span> (cache->c_ops != &<a class="code" href="structrtnl__qdisc__ops.html" title="Qdisc Operations.">rtnl_qdisc_ops</a>)
<a name="l00438"></a>00438 <span class="keywordflow">return</span> NULL;
<a name="l00439"></a>00439
<a name="l00440"></a>00440 nl_list_for_each_entry(q, &cache->c_items, ce_list) {
<a name="l00441"></a>00441 <span class="keywordflow">if</span> (q->q_handle == handle && q->q_ifindex == ifindex) {
<a name="l00442"></a>00442 <a class="code" href="group__object.html#gabd5767ac47ec6f09d1ac643f44eb8bfd" title="Acquire a reference on a object.">nl_object_get</a>((<span class="keyword">struct</span> nl_object *) q);
<a name="l00443"></a>00443 <span class="keywordflow">return</span> q;
<a name="l00444"></a>00444 }
<a name="l00445"></a>00445 }
<a name="l00446"></a>00446
<a name="l00447"></a>00447 <span class="keywordflow">return</span> NULL;
<a name="l00448"></a>00448 }
<a name="l00449"></a>00449 <span class="comment"></span>
<a name="l00450"></a>00450 <span class="comment">/** @} */</span>
<a name="l00451"></a>00451
<a name="l00452"></a>00452 <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__qdisc__ops.html" title="Qdisc Operations.">rtnl_qdisc_ops</a> = {
<a name="l00453"></a>00453 .co_name = <span class="stringliteral">"route/qdisc"</span>,
<a name="l00454"></a>00454 .co_hdrsize = <span class="keyword">sizeof</span>(<span class="keyword">struct </span>tcmsg),
<a name="l00455"></a>00455 .co_msgtypes = {
<a name="l00456"></a>00456 { RTM_NEWQDISC, NL_ACT_NEW, <span class="stringliteral">"new"</span> },
<a name="l00457"></a>00457 { RTM_DELQDISC, NL_ACT_DEL, <span class="stringliteral">"del"</span> },
<a name="l00458"></a>00458 { RTM_GETQDISC, NL_ACT_GET, <span class="stringliteral">"get"</span> },
<a name="l00459"></a>00459 END_OF_MSGTYPES_LIST,
<a name="l00460"></a>00460 },
<a name="l00461"></a>00461 .co_protocol = NETLINK_ROUTE,
<a name="l00462"></a>00462 .co_request_update = qdisc_request_update,
<a name="l00463"></a>00463 .co_msg_parser = qdisc_msg_parser,
<a name="l00464"></a>00464 .co_obj_ops = &qdisc_obj_ops,
<a name="l00465"></a>00465 };
<a name="l00466"></a>00466
<a name="l00467"></a>00467 <span class="keyword">static</span> <span class="keywordtype">void</span> __init qdisc_init(<span class="keywordtype">void</span>)
<a name="l00468"></a>00468 {
<a name="l00469"></a>00469 <a class="code" href="group__cache__mngt.html#ga390eeb1fa61634cf1c216792c6df63c3" title="Register a set of cache operations.">nl_cache_mngt_register</a>(&rtnl_qdisc_ops);
<a name="l00470"></a>00470 }
<a name="l00471"></a>00471
<a name="l00472"></a>00472 <span class="keyword">static</span> <span class="keywordtype">void</span> __exit qdisc_exit(<span class="keywordtype">void</span>)
<a name="l00473"></a>00473 {
<a name="l00474"></a>00474 <a class="code" href="group__cache__mngt.html#ga09f56b767b3868b7e0cf8559863dde77" title="Unregister a set of cache operations.">nl_cache_mngt_unregister</a>(&rtnl_qdisc_ops);
<a name="l00475"></a>00475 }
<a name="l00476"></a>00476 <span class="comment"></span>
<a name="l00477"></a>00477 <span class="comment">/** @} */</span>
</pre></div></div>
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distrib
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Fedora
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