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<h1>lib/netfilter/nfnl.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/netfilter/nfnl.c Netfilter Netlink</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"> * Copyright (c) 2007 Philip Craig <philipc@snapgear.com></span>
<a name="l00011"></a>00011 <span class="comment"> * Copyright (c) 2007 Secure Computing Corporation</span>
<a name="l00012"></a>00012 <span class="comment"> */</span>
<a name="l00013"></a>00013 <span class="comment"></span>
<a name="l00014"></a>00014 <span class="comment">/**</span>
<a name="l00015"></a>00015 <span class="comment"> * @ingroup nlfam</span>
<a name="l00016"></a>00016 <span class="comment"> * @defgroup nfnl Netfilter Netlink</span>
<a name="l00017"></a>00017 <span class="comment"> *</span>
<a name="l00018"></a>00018 <span class="comment"> * @par Message Format</span>
<a name="l00019"></a>00019 <span class="comment"> * @code</span>
<a name="l00020"></a>00020 <span class="comment"> * <------- NLMSG_ALIGN(hlen) ------> <---- NLMSG_ALIGN(len) ---></span>
<a name="l00021"></a>00021 <span class="comment"> * +----------------------------+- - -+- - - - - - - - - - -+- - -+</span>
<a name="l00022"></a>00022 <span class="comment"> * | Header | Pad | Payload | Pad |</span>
<a name="l00023"></a>00023 <span class="comment"> * | struct nlmsghdr | | | |</span>
<a name="l00024"></a>00024 <span class="comment"> * +----------------------------+- - -+- - - - - - - - - - -+- - -+</span>
<a name="l00025"></a>00025 <span class="comment"> * @endcode</span>
<a name="l00026"></a>00026 <span class="comment"> * @code</span>
<a name="l00027"></a>00027 <span class="comment"> * <-------- NFNL_HDRLEN ---------></span>
<a name="l00028"></a>00028 <span class="comment"> * +--------------------------+- - -+------------+</span>
<a name="l00029"></a>00029 <span class="comment"> * | Netfilter Netlink Header | Pad | Attributes |</span>
<a name="l00030"></a>00030 <span class="comment"> * | struct nfgenmsg | | |</span>
<a name="l00031"></a>00031 <span class="comment"> * +--------------------------+- - -+------------+</span>
<a name="l00032"></a>00032 <span class="comment"> * nfnlmsg_attrdata(nfg, hdrlen)-----^</span>
<a name="l00033"></a>00033 <span class="comment"> * @endcode</span>
<a name="l00034"></a>00034 <span class="comment"> *</span>
<a name="l00035"></a>00035 <span class="comment"> * @par 1) Creating a new netfilter netlink message</span>
<a name="l00036"></a>00036 <span class="comment"> * @code</span>
<a name="l00037"></a>00037 <span class="comment"> * struct nl_msg *msg;</span>
<a name="l00038"></a>00038 <span class="comment"> *</span>
<a name="l00039"></a>00039 <span class="comment"> * // Create a new empty netlink message</span>
<a name="l00040"></a>00040 <span class="comment"> * msg = nlmsg_alloc();</span>
<a name="l00041"></a>00041 <span class="comment"> *</span>
<a name="l00042"></a>00042 <span class="comment"> * // Append the netlink and netfilter netlink message header</span>
<a name="l00043"></a>00043 <span class="comment"> * hdr = nfnlmsg_put(msg, PID, SEQ, SUBSYS, TYPE, NLM_F_ECHO,</span>
<a name="l00044"></a>00044 <span class="comment"> * FAMILY, RES_ID);</span>
<a name="l00045"></a>00045 <span class="comment"> *</span>
<a name="l00046"></a>00046 <span class="comment"> * // Append the attributes.</span>
<a name="l00047"></a>00047 <span class="comment"> * nla_put_u32(msg, 1, 0x10);</span>
<a name="l00048"></a>00048 <span class="comment"> *</span>
<a name="l00049"></a>00049 <span class="comment"> * // Message is ready to be sent.</span>
<a name="l00050"></a>00050 <span class="comment"> * nl_send_auto_complete(nl_handle, msg);</span>
<a name="l00051"></a>00051 <span class="comment"> *</span>
<a name="l00052"></a>00052 <span class="comment"> * // All done? Free the message.</span>
<a name="l00053"></a>00053 <span class="comment"> * nlmsg_free(msg);</span>
<a name="l00054"></a>00054 <span class="comment"> * @endcode</span>
<a name="l00055"></a>00055 <span class="comment"> *</span>
<a name="l00056"></a>00056 <span class="comment"> * @par 2) Sending of trivial messages</span>
<a name="l00057"></a>00057 <span class="comment"> * @code</span>
<a name="l00058"></a>00058 <span class="comment"> * // For trivial messages not requiring any subsys specific header or</span>
<a name="l00059"></a>00059 <span class="comment"> * // attributes, nfnl_send_simple() may be used to send messages directly.</span>
<a name="l00060"></a>00060 <span class="comment"> * nfnl_send_simple(nl_handle, SUBSYS, TYPE, 0, FAMILY, RES_ID);</span>
<a name="l00061"></a>00061 <span class="comment"> * @endcode</span>
<a name="l00062"></a>00062 <span class="comment"> * @{</span>
<a name="l00063"></a>00063 <span class="comment"> */</span>
<a name="l00064"></a>00064
<a name="l00065"></a>00065 <span class="preprocessor">#include <netlink-local.h></span>
<a name="l00066"></a>00066 <span class="preprocessor">#include <netlink/netlink.h></span>
<a name="l00067"></a>00067 <span class="preprocessor">#include <netlink/netfilter/nfnl.h></span>
<a name="l00068"></a>00068 <span class="comment"></span>
<a name="l00069"></a>00069 <span class="comment">/**</span>
<a name="l00070"></a>00070 <span class="comment"> * @name Socket Creating</span>
<a name="l00071"></a>00071 <span class="comment"> * @{</span>
<a name="l00072"></a>00072 <span class="comment"> */</span>
<a name="l00073"></a>00073 <span class="comment"></span>
<a name="l00074"></a>00074 <span class="comment">/**</span>
<a name="l00075"></a>00075 <span class="comment"> * Create and connect netfilter netlink socket.</span>
<a name="l00076"></a>00076 <span class="comment"> * @arg handle Netlink handle.</span>
<a name="l00077"></a>00077 <span class="comment"> *</span>
<a name="l00078"></a>00078 <span class="comment"> * Creates a NETLINK_NETFILTER netlink socket, binds the socket and</span>
<a name="l00079"></a>00079 <span class="comment"> * issues a connection attempt.</span>
<a name="l00080"></a>00080 <span class="comment"> *</span>
<a name="l00081"></a>00081 <span class="comment"> * @see nl_connect()</span>
<a name="l00082"></a>00082 <span class="comment"> *</span>
<a name="l00083"></a>00083 <span class="comment"> * @return 0 on success or a negative error code.</span>
<a name="l00084"></a>00084 <span class="comment"> */</span>
<a name="l00085"></a><a class="code" href="group__nfnl.html#gaec500dac0b101190326f90e2abd3f7f8">00085</a> <span class="keywordtype">int</span> <a class="code" href="group__nfnl.html#gaec500dac0b101190326f90e2abd3f7f8" title="Create and connect netfilter netlink socket.">nfnl_connect</a>(<span class="keyword">struct</span> nl_handle *handle)
<a name="l00086"></a>00086 {
<a name="l00087"></a>00087 <span class="keywordflow">return</span> <a class="code" href="group__nl.html#ga68655d7fa8bd1944bec4761c95e576e9" title="Create and connect netlink socket.">nl_connect</a>(handle, NETLINK_NETFILTER);
<a name="l00088"></a>00088 }
<a name="l00089"></a>00089 <span class="comment"></span>
<a name="l00090"></a>00090 <span class="comment">/** @} */</span>
<a name="l00091"></a>00091 <span class="comment"></span>
<a name="l00092"></a>00092 <span class="comment">/**</span>
<a name="l00093"></a>00093 <span class="comment"> * @name Sending</span>
<a name="l00094"></a>00094 <span class="comment"> * @{</span>
<a name="l00095"></a>00095 <span class="comment"> */</span>
<a name="l00096"></a>00096 <span class="comment"></span>
<a name="l00097"></a>00097 <span class="comment">/**</span>
<a name="l00098"></a>00098 <span class="comment"> * Send trivial netfilter netlink message</span>
<a name="l00099"></a>00099 <span class="comment"> * @arg handle Netlink handle.</span>
<a name="l00100"></a>00100 <span class="comment"> * @arg subsys_id nfnetlink subsystem</span>
<a name="l00101"></a>00101 <span class="comment"> * @arg type nfnetlink message type</span>
<a name="l00102"></a>00102 <span class="comment"> * @arg flags message flags</span>
<a name="l00103"></a>00103 <span class="comment"> * @arg family nfnetlink address family</span>
<a name="l00104"></a>00104 <span class="comment"> * @arg res_id nfnetlink resource id</span>
<a name="l00105"></a>00105 <span class="comment"> *</span>
<a name="l00106"></a>00106 <span class="comment"> * @return Newly allocated netlink message or NULL.</span>
<a name="l00107"></a>00107 <span class="comment"> */</span>
<a name="l00108"></a><a class="code" href="group__nfnl.html#ga0c1b3dd550e49dfc74f4ba18cc6cfebf">00108</a> <span class="keywordtype">int</span> <a class="code" href="group__nfnl.html#ga0c1b3dd550e49dfc74f4ba18cc6cfebf" title="Send trivial netfilter netlink message.">nfnl_send_simple</a>(<span class="keyword">struct</span> nl_handle *handle, uint8_t subsys_id, uint8_t type,
<a name="l00109"></a>00109 <span class="keywordtype">int</span> flags, uint8_t family, uint16_t res_id)
<a name="l00110"></a>00110 {
<a name="l00111"></a>00111 <span class="keyword">struct </span>nfgenmsg hdr = {
<a name="l00112"></a>00112 .nfgen_family = family,
<a name="l00113"></a>00113 .version = NFNETLINK_V0,
<a name="l00114"></a>00114 .res_id = htons(res_id),
<a name="l00115"></a>00115 };
<a name="l00116"></a>00116
<a name="l00117"></a>00117 <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, NFNLMSG_TYPE(subsys_id, type), flags,
<a name="l00118"></a>00118 &hdr, <span class="keyword">sizeof</span>(hdr));
<a name="l00119"></a>00119 }
<a name="l00120"></a>00120 <span class="comment"></span>
<a name="l00121"></a>00121 <span class="comment">/** @} */</span>
<a name="l00122"></a>00122 <span class="comment"></span>
<a name="l00123"></a>00123 <span class="comment">/**</span>
<a name="l00124"></a>00124 <span class="comment"> * @name Message Parsing</span>
<a name="l00125"></a>00125 <span class="comment"> * @{</span>
<a name="l00126"></a>00126 <span class="comment"> */</span>
<a name="l00127"></a>00127 <span class="comment"></span>
<a name="l00128"></a>00128 <span class="comment">/**</span>
<a name="l00129"></a>00129 <span class="comment"> * Get netfilter subsystem id from message</span>
<a name="l00130"></a>00130 <span class="comment"> * @arg nlh netlink messsage header</span>
<a name="l00131"></a>00131 <span class="comment"> */</span>
<a name="l00132"></a><a class="code" href="group__nfnl.html#ga8bf67cd1369d4b882a38bdfa27ffb02a">00132</a> uint8_t <a class="code" href="group__nfnl.html#ga8bf67cd1369d4b882a38bdfa27ffb02a" title="Get netfilter subsystem id from message.">nfnlmsg_subsys</a>(<span class="keyword">struct</span> <a class="code" href="structnlmsghdr.html" title="Netlink message header.">nlmsghdr</a> *nlh)
<a name="l00133"></a>00133 {
<a name="l00134"></a>00134 <span class="keywordflow">return</span> NFNL_SUBSYS_ID(nlh-><a class="code" href="structnlmsghdr.html#a7232c4e6cb513010e64887b7eebf8823" title="Message type (content type)">nlmsg_type</a>);
<a name="l00135"></a>00135 }
<a name="l00136"></a>00136 <span class="comment"></span>
<a name="l00137"></a>00137 <span class="comment">/**</span>
<a name="l00138"></a>00138 <span class="comment"> * Get netfilter message type from message</span>
<a name="l00139"></a>00139 <span class="comment"> * @arg nlh netlink messsage header</span>
<a name="l00140"></a>00140 <span class="comment"> */</span>
<a name="l00141"></a><a class="code" href="group__nfnl.html#gaf1bb10eb2462b46f2a4bf48d1a0e0c33">00141</a> uint8_t <a class="code" href="group__nfnl.html#gaf1bb10eb2462b46f2a4bf48d1a0e0c33" title="Get netfilter message type from message.">nfnlmsg_subtype</a>(<span class="keyword">struct</span> <a class="code" href="structnlmsghdr.html" title="Netlink message header.">nlmsghdr</a> *nlh)
<a name="l00142"></a>00142 {
<a name="l00143"></a>00143 <span class="keywordflow">return</span> NFNL_MSG_TYPE(nlh-><a class="code" href="structnlmsghdr.html#a7232c4e6cb513010e64887b7eebf8823" title="Message type (content type)">nlmsg_type</a>);
<a name="l00144"></a>00144 }
<a name="l00145"></a>00145 <span class="comment"></span>
<a name="l00146"></a>00146 <span class="comment">/**</span>
<a name="l00147"></a>00147 <span class="comment"> * Get netfilter family from message</span>
<a name="l00148"></a>00148 <span class="comment"> * @arg nlh netlink messsage header</span>
<a name="l00149"></a>00149 <span class="comment"> */</span>
<a name="l00150"></a><a class="code" href="group__nfnl.html#ga91b2b1c9b8e243fe070229ef3fff3d6c">00150</a> uint8_t <a class="code" href="group__nfnl.html#ga91b2b1c9b8e243fe070229ef3fff3d6c" title="Get netfilter family from message.">nfnlmsg_family</a>(<span class="keyword">struct</span> <a class="code" href="structnlmsghdr.html" title="Netlink message header.">nlmsghdr</a> *nlh)
<a name="l00151"></a>00151 {
<a name="l00152"></a>00152 <span class="keyword">struct </span>nfgenmsg *nfg = <a class="code" href="group__msg.html#gae44a904bb40c8b5f5ff31539c21cfa5a" title="head of message payload">nlmsg_data</a>(nlh);
<a name="l00153"></a>00153
<a name="l00154"></a>00154 <span class="keywordflow">return</span> nfg->nfgen_family;
<a name="l00155"></a>00155 }
<a name="l00156"></a>00156 <span class="comment"></span>
<a name="l00157"></a>00157 <span class="comment">/**</span>
<a name="l00158"></a>00158 <span class="comment"> * Get netfilter resource id from message</span>
<a name="l00159"></a>00159 <span class="comment"> * @arg nlh netlink messsage header</span>
<a name="l00160"></a>00160 <span class="comment"> */</span>
<a name="l00161"></a><a class="code" href="group__nfnl.html#ga81d2b6a0cdc1ad5a48a15d536c0a8a6d">00161</a> uint16_t <a class="code" href="group__nfnl.html#ga81d2b6a0cdc1ad5a48a15d536c0a8a6d" title="Get netfilter resource id from message.">nfnlmsg_res_id</a>(<span class="keyword">struct</span> <a class="code" href="structnlmsghdr.html" title="Netlink message header.">nlmsghdr</a> *nlh)
<a name="l00162"></a>00162 {
<a name="l00163"></a>00163 <span class="keyword">struct </span>nfgenmsg *nfg = <a class="code" href="group__msg.html#gae44a904bb40c8b5f5ff31539c21cfa5a" title="head of message payload">nlmsg_data</a>(nlh);
<a name="l00164"></a>00164
<a name="l00165"></a>00165 <span class="keywordflow">return</span> ntohs(nfg->res_id);
<a name="l00166"></a>00166 }
<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"></span>
<a name="l00170"></a>00170 <span class="comment">/**</span>
<a name="l00171"></a>00171 <span class="comment"> * @name Message Building</span>
<a name="l00172"></a>00172 <span class="comment"> * @{</span>
<a name="l00173"></a>00173 <span class="comment"> */</span>
<a name="l00174"></a>00174
<a name="l00175"></a>00175 <span class="keyword">static</span> <span class="keywordtype">int</span> nfnlmsg_append(<span class="keyword">struct</span> nl_msg *msg, uint8_t family, uint16_t res_id)
<a name="l00176"></a>00176 {
<a name="l00177"></a>00177 <span class="keyword">struct </span>nfgenmsg *nfg;
<a name="l00178"></a>00178
<a name="l00179"></a>00179 nfg = <a class="code" href="group__msg.html#ga206eac17e0e75ae8457a513612395554" title="Reserve room for additional data in a netlink message.">nlmsg_reserve</a>(msg, <span class="keyword">sizeof</span>(*nfg), NLMSG_ALIGNTO);
<a name="l00180"></a>00180 <span class="keywordflow">if</span> (nfg == NULL)
<a name="l00181"></a>00181 <span class="keywordflow">return</span> nl_errno(ENOMEM);
<a name="l00182"></a>00182
<a name="l00183"></a>00183 nfg->nfgen_family = family;
<a name="l00184"></a>00184 nfg->version = NFNETLINK_V0;
<a name="l00185"></a>00185 nfg->res_id = htons(res_id);
<a name="l00186"></a>00186 NL_DBG(2, <span class="stringliteral">"msg %p: Added nfnetlink header family=%d res_id=%d\n"</span>,
<a name="l00187"></a>00187 msg, family, res_id);
<a name="l00188"></a>00188 <span class="keywordflow">return</span> 0;
<a name="l00189"></a>00189 }
<a name="l00190"></a>00190 <span class="comment"></span>
<a name="l00191"></a>00191 <span class="comment">/**</span>
<a name="l00192"></a>00192 <span class="comment"> * Allocate a new netfilter netlink message</span>
<a name="l00193"></a>00193 <span class="comment"> * @arg subsys_id nfnetlink subsystem</span>
<a name="l00194"></a>00194 <span class="comment"> * @arg type nfnetlink message type</span>
<a name="l00195"></a>00195 <span class="comment"> * @arg flags message flags</span>
<a name="l00196"></a>00196 <span class="comment"> * @arg family nfnetlink address family</span>
<a name="l00197"></a>00197 <span class="comment"> * @arg res_id nfnetlink resource id</span>
<a name="l00198"></a>00198 <span class="comment"> *</span>
<a name="l00199"></a>00199 <span class="comment"> * @return Newly allocated netlink message or NULL.</span>
<a name="l00200"></a>00200 <span class="comment"> */</span>
<a name="l00201"></a><a class="code" href="group__nfnl.html#gaf2c5b1fb596e8fdb62eb782496ac88c3">00201</a> <span class="keyword">struct </span>nl_msg *<a class="code" href="group__nfnl.html#gaf2c5b1fb596e8fdb62eb782496ac88c3" title="Allocate a new netfilter netlink message.">nfnlmsg_alloc_simple</a>(uint8_t subsys_id, uint8_t type, <span class="keywordtype">int</span> flags,
<a name="l00202"></a>00202 uint8_t family, uint16_t res_id)
<a name="l00203"></a>00203 {
<a name="l00204"></a>00204 <span class="keyword">struct </span>nl_msg *msg;
<a name="l00205"></a>00205
<a name="l00206"></a>00206 msg = <a class="code" href="group__msg.html#ga580d8697d19050c55060bc10ab4eae9f" title="Allocate a new netlink message.">nlmsg_alloc_simple</a>(NFNLMSG_TYPE(subsys_id, type), flags);
<a name="l00207"></a>00207 <span class="keywordflow">if</span> (msg == NULL)
<a name="l00208"></a>00208 <span class="keywordflow">return</span> NULL;
<a name="l00209"></a>00209
<a name="l00210"></a>00210 <span class="keywordflow">if</span> (nfnlmsg_append(msg, family, res_id) < 0)
<a name="l00211"></a>00211 <span class="keywordflow">goto</span> nla_put_failure;
<a name="l00212"></a>00212
<a name="l00213"></a>00213 <span class="keywordflow">return</span> msg;
<a name="l00214"></a>00214
<a name="l00215"></a>00215 nla_put_failure:
<a name="l00216"></a>00216 <a class="code" href="group__msg.html#ga138ba9bee70553f9fbe7143deacad48c" title="Free a netlink message.">nlmsg_free</a>(msg);
<a name="l00217"></a>00217 <span class="keywordflow">return</span> NULL;
<a name="l00218"></a>00218 }
<a name="l00219"></a>00219 <span class="comment"></span>
<a name="l00220"></a>00220 <span class="comment">/**</span>
<a name="l00221"></a>00221 <span class="comment"> * Add netlink and netfilter netlink headers to netlink message</span>
<a name="l00222"></a>00222 <span class="comment"> * @arg msg netlink message</span>
<a name="l00223"></a>00223 <span class="comment"> * @arg pid netlink process id</span>
<a name="l00224"></a>00224 <span class="comment"> * @arg seq sequence number of message</span>
<a name="l00225"></a>00225 <span class="comment"> * @arg subsys_id nfnetlink subsystem</span>
<a name="l00226"></a>00226 <span class="comment"> * @arg type nfnetlink message type</span>
<a name="l00227"></a>00227 <span class="comment"> * @arg flags message flags</span>
<a name="l00228"></a>00228 <span class="comment"> * @arg family nfnetlink address family</span>
<a name="l00229"></a>00229 <span class="comment"> * @arg res_id nfnetlink resource id</span>
<a name="l00230"></a>00230 <span class="comment"> */</span>
<a name="l00231"></a><a class="code" href="group__nfnl.html#ga94e6a82031c8e4cecca7140e2d0a62f4">00231</a> <span class="keywordtype">int</span> <a class="code" href="group__nfnl.html#ga94e6a82031c8e4cecca7140e2d0a62f4" title="Add netlink and netfilter netlink headers to netlink message.">nfnlmsg_put</a>(<span class="keyword">struct</span> nl_msg *msg, uint32_t pid, uint32_t seq,
<a name="l00232"></a>00232 uint8_t subsys_id, uint8_t type, <span class="keywordtype">int</span> flags, uint8_t family,
<a name="l00233"></a>00233 uint16_t res_id)
<a name="l00234"></a>00234 {
<a name="l00235"></a>00235 <span class="keyword">struct </span><a class="code" href="structnlmsghdr.html" title="Netlink message header.">nlmsghdr</a> *nlh;
<a name="l00236"></a>00236
<a name="l00237"></a>00237 nlh = <a class="code" href="group__msg.html#ga16919a9a8579f8b538b0376781c1839d" title="Add a netlink message header to a netlink message.">nlmsg_put</a>(msg, pid, seq, NFNLMSG_TYPE(subsys_id, type), 0, flags);
<a name="l00238"></a>00238 <span class="keywordflow">if</span> (nlh == NULL)
<a name="l00239"></a>00239 <span class="keywordflow">return</span> nl_get_errno();
<a name="l00240"></a>00240
<a name="l00241"></a>00241 <span class="keywordflow">return</span> nfnlmsg_append(msg, family, res_id);
<a name="l00242"></a>00242 }
<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"></span>
<a name="l00246"></a>00246 <span class="comment">/** @} */</span>
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