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<div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno"> 1</span> <span class="comment">/*</span></div>
<div class="line"><a name="l00002"></a><span class="lineno"> 2</span> <span class="comment"> * lib/netfilter/nfnl.c Netfilter Netlink</span></div>
<div class="line"><a name="l00003"></a><span class="lineno"> 3</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00004"></a><span class="lineno"> 4</span> <span class="comment"> * This library is free software; you can redistribute it and/or</span></div>
<div class="line"><a name="l00005"></a><span class="lineno"> 5</span> <span class="comment"> * modify it under the terms of the GNU Lesser General Public</span></div>
<div class="line"><a name="l00006"></a><span class="lineno"> 6</span> <span class="comment"> * License as published by the Free Software Foundation version 2.1</span></div>
<div class="line"><a name="l00007"></a><span class="lineno"> 7</span> <span class="comment"> * of the License.</span></div>
<div class="line"><a name="l00008"></a><span class="lineno"> 8</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00009"></a><span class="lineno"> 9</span> <span class="comment"> * Copyright (c) 2003-2012 Thomas Graf <tgraf@suug.ch></span></div>
<div class="line"><a name="l00010"></a><span class="lineno"> 10</span> <span class="comment"> * Copyright (c) 2007 Philip Craig <philipc@snapgear.com></span></div>
<div class="line"><a name="l00011"></a><span class="lineno"> 11</span> <span class="comment"> * Copyright (c) 2007 Secure Computing Corporation</span></div>
<div class="line"><a name="l00012"></a><span class="lineno"> 12</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00013"></a><span class="lineno"> 13</span> <span class="comment"></span></div>
<div class="line"><a name="l00014"></a><span class="lineno"> 14</span> <span class="comment">/**</span></div>
<div class="line"><a name="l00015"></a><span class="lineno"> 15</span> <span class="comment"> * @defgroup nfnl Netfilter Library (libnl-nf)</span></div>
<div class="line"><a name="l00016"></a><span class="lineno"> 16</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00017"></a><span class="lineno"> 17</span> <span class="comment"> * @par Message Format</span></div>
<div class="line"><a name="l00018"></a><span class="lineno"> 18</span> <span class="comment"> * @code</span></div>
<div class="line"><a name="l00019"></a><span class="lineno"> 19</span> <span class="comment"> * <------- NLMSG_ALIGN(hlen) ------> <---- NLMSG_ALIGN(len) ---></span></div>
<div class="line"><a name="l00020"></a><span class="lineno"> 20</span> <span class="comment"> * +----------------------------+- - -+- - - - - - - - - - -+- - -+</span></div>
<div class="line"><a name="l00021"></a><span class="lineno"> 21</span> <span class="comment"> * | Header | Pad | Payload | Pad |</span></div>
<div class="line"><a name="l00022"></a><span class="lineno"> 22</span> <span class="comment"> * | struct nlmsghdr | | | |</span></div>
<div class="line"><a name="l00023"></a><span class="lineno"> 23</span> <span class="comment"> * +----------------------------+- - -+- - - - - - - - - - -+- - -+</span></div>
<div class="line"><a name="l00024"></a><span class="lineno"> 24</span> <span class="comment"> * @endcode</span></div>
<div class="line"><a name="l00025"></a><span class="lineno"> 25</span> <span class="comment"> * @code</span></div>
<div class="line"><a name="l00026"></a><span class="lineno"> 26</span> <span class="comment"> * <-------- NFNL_HDRLEN ---------></span></div>
<div class="line"><a name="l00027"></a><span class="lineno"> 27</span> <span class="comment"> * +--------------------------+- - -+------------+</span></div>
<div class="line"><a name="l00028"></a><span class="lineno"> 28</span> <span class="comment"> * | Netfilter Netlink Header | Pad | Attributes |</span></div>
<div class="line"><a name="l00029"></a><span class="lineno"> 29</span> <span class="comment"> * | struct nfgenmsg | | |</span></div>
<div class="line"><a name="l00030"></a><span class="lineno"> 30</span> <span class="comment"> * +--------------------------+- - -+------------+</span></div>
<div class="line"><a name="l00031"></a><span class="lineno"> 31</span> <span class="comment"> * nfnlmsg_attrdata(nfg, hdrlen)-----^</span></div>
<div class="line"><a name="l00032"></a><span class="lineno"> 32</span> <span class="comment"> * @endcode</span></div>
<div class="line"><a name="l00033"></a><span class="lineno"> 33</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00034"></a><span class="lineno"> 34</span> <span class="comment"> * @par 1) Creating a new netfilter netlink message</span></div>
<div class="line"><a name="l00035"></a><span class="lineno"> 35</span> <span class="comment"> * @code</span></div>
<div class="line"><a name="l00036"></a><span class="lineno"> 36</span> <span class="comment"> * struct nl_msg *msg;</span></div>
<div class="line"><a name="l00037"></a><span class="lineno"> 37</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00038"></a><span class="lineno"> 38</span> <span class="comment"> * // Create a new empty netlink message</span></div>
<div class="line"><a name="l00039"></a><span class="lineno"> 39</span> <span class="comment"> * msg = nlmsg_alloc();</span></div>
<div class="line"><a name="l00040"></a><span class="lineno"> 40</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00041"></a><span class="lineno"> 41</span> <span class="comment"> * // Append the netlink and netfilter netlink message header</span></div>
<div class="line"><a name="l00042"></a><span class="lineno"> 42</span> <span class="comment"> * hdr = nfnlmsg_put(msg, PID, SEQ, SUBSYS, TYPE, NLM_F_ECHO,</span></div>
<div class="line"><a name="l00043"></a><span class="lineno"> 43</span> <span class="comment"> * FAMILY, RES_ID);</span></div>
<div class="line"><a name="l00044"></a><span class="lineno"> 44</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00045"></a><span class="lineno"> 45</span> <span class="comment"> * // Append the attributes.</span></div>
<div class="line"><a name="l00046"></a><span class="lineno"> 46</span> <span class="comment"> * nla_put_u32(msg, 1, 0x10);</span></div>
<div class="line"><a name="l00047"></a><span class="lineno"> 47</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00048"></a><span class="lineno"> 48</span> <span class="comment"> * // Message is ready to be sent.</span></div>
<div class="line"><a name="l00049"></a><span class="lineno"> 49</span> <span class="comment"> * nl_send_auto_complete(sk, msg);</span></div>
<div class="line"><a name="l00050"></a><span class="lineno"> 50</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00051"></a><span class="lineno"> 51</span> <span class="comment"> * // All done? Free the message.</span></div>
<div class="line"><a name="l00052"></a><span class="lineno"> 52</span> <span class="comment"> * nlmsg_free(msg);</span></div>
<div class="line"><a name="l00053"></a><span class="lineno"> 53</span> <span class="comment"> * @endcode</span></div>
<div class="line"><a name="l00054"></a><span class="lineno"> 54</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00055"></a><span class="lineno"> 55</span> <span class="comment"> * @par 2) Sending of trivial messages</span></div>
<div class="line"><a name="l00056"></a><span class="lineno"> 56</span> <span class="comment"> * @code</span></div>
<div class="line"><a name="l00057"></a><span class="lineno"> 57</span> <span class="comment"> * // For trivial messages not requiring any subsys specific header or</span></div>
<div class="line"><a name="l00058"></a><span class="lineno"> 58</span> <span class="comment"> * // attributes, nfnl_send_simple() may be used to send messages directly.</span></div>
<div class="line"><a name="l00059"></a><span class="lineno"> 59</span> <span class="comment"> * nfnl_send_simple(sk, SUBSYS, TYPE, 0, FAMILY, RES_ID);</span></div>
<div class="line"><a name="l00060"></a><span class="lineno"> 60</span> <span class="comment"> * @endcode</span></div>
<div class="line"><a name="l00061"></a><span class="lineno"> 61</span> <span class="comment"> * @{</span></div>
<div class="line"><a name="l00062"></a><span class="lineno"> 62</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00063"></a><span class="lineno"> 63</span> </div>
<div class="line"><a name="l00064"></a><span class="lineno"> 64</span> <span class="preprocessor">#include <netlink-private/netlink.h></span></div>
<div class="line"><a name="l00065"></a><span class="lineno"> 65</span> <span class="preprocessor">#include <netlink/netlink.h></span></div>
<div class="line"><a name="l00066"></a><span class="lineno"> 66</span> <span class="preprocessor">#include <netlink/netfilter/nfnl.h></span></div>
<div class="line"><a name="l00067"></a><span class="lineno"> 67</span> <span class="comment"></span></div>
<div class="line"><a name="l00068"></a><span class="lineno"> 68</span> <span class="comment">/**</span></div>
<div class="line"><a name="l00069"></a><span class="lineno"> 69</span> <span class="comment"> * @name Socket Creating</span></div>
<div class="line"><a name="l00070"></a><span class="lineno"> 70</span> <span class="comment"> * @{</span></div>
<div class="line"><a name="l00071"></a><span class="lineno"> 71</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00072"></a><span class="lineno"> 72</span> <span class="comment"></span></div>
<div class="line"><a name="l00073"></a><span class="lineno"> 73</span> <span class="comment">/**</span></div>
<div class="line"><a name="l00074"></a><span class="lineno"> 74</span> <span class="comment"> * Create and connect netfilter netlink socket.</span></div>
<div class="line"><a name="l00075"></a><span class="lineno"> 75</span> <span class="comment"> * @arg sk Netlink socket.</span></div>
<div class="line"><a name="l00076"></a><span class="lineno"> 76</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00077"></a><span class="lineno"> 77</span> <span class="comment"> * Creates a NETLINK_NETFILTER netlink socket, binds the socket and</span></div>
<div class="line"><a name="l00078"></a><span class="lineno"> 78</span> <span class="comment"> * issues a connection attempt.</span></div>
<div class="line"><a name="l00079"></a><span class="lineno"> 79</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00080"></a><span class="lineno"> 80</span> <span class="comment"> * @see nl_connect()</span></div>
<div class="line"><a name="l00081"></a><span class="lineno"> 81</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00082"></a><span class="lineno"> 82</span> <span class="comment"> * @return 0 on success or a negative error code.</span></div>
<div class="line"><a name="l00083"></a><span class="lineno"> 83</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00084"></a><span class="lineno"><a class="code" href="group__nfnl.html#gaa6395b6add1d6df1362c64951378db55"> 84</a></span> <span class="keywordtype">int</span> <a class="code" href="group__nfnl.html#gaa6395b6add1d6df1362c64951378db55" title="Create and connect netfilter netlink socket.">nfnl_connect</a>(<span class="keyword">struct</span> nl_sock *sk)</div>
<div class="line"><a name="l00085"></a><span class="lineno"> 85</span> {</div>
<div class="line"><a name="l00086"></a><span class="lineno"> 86</span>  <span class="keywordflow">return</span> <a class="code" href="group__send__recv.html#ga86da21b5037e3b883f307661c3edd22f" title="Create file descriptor and bind socket.">nl_connect</a>(sk, NETLINK_NETFILTER);</div>
<div class="line"><a name="l00087"></a><span class="lineno"> 87</span> }</div>
<div class="line"><a name="l00088"></a><span class="lineno"> 88</span> <span class="comment"></span></div>
<div class="line"><a name="l00089"></a><span class="lineno"> 89</span> <span class="comment">/** @} */</span></div>
<div class="line"><a name="l00090"></a><span class="lineno"> 90</span> <span class="comment"></span></div>
<div class="line"><a name="l00091"></a><span class="lineno"> 91</span> <span class="comment">/**</span></div>
<div class="line"><a name="l00092"></a><span class="lineno"> 92</span> <span class="comment"> * @name Sending</span></div>
<div class="line"><a name="l00093"></a><span class="lineno"> 93</span> <span class="comment"> * @{</span></div>
<div class="line"><a name="l00094"></a><span class="lineno"> 94</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00095"></a><span class="lineno"> 95</span> <span class="comment"></span></div>
<div class="line"><a name="l00096"></a><span class="lineno"> 96</span> <span class="comment">/**</span></div>
<div class="line"><a name="l00097"></a><span class="lineno"> 97</span> <span class="comment"> * Send trivial netfilter netlink message</span></div>
<div class="line"><a name="l00098"></a><span class="lineno"> 98</span> <span class="comment"> * @arg sk Netlink socket.</span></div>
<div class="line"><a name="l00099"></a><span class="lineno"> 99</span> <span class="comment"> * @arg subsys_id nfnetlink subsystem</span></div>
<div class="line"><a name="l00100"></a><span class="lineno"> 100</span> <span class="comment"> * @arg type nfnetlink message type</span></div>
<div class="line"><a name="l00101"></a><span class="lineno"> 101</span> <span class="comment"> * @arg flags message flags</span></div>
<div class="line"><a name="l00102"></a><span class="lineno"> 102</span> <span class="comment"> * @arg family nfnetlink address family</span></div>
<div class="line"><a name="l00103"></a><span class="lineno"> 103</span> <span class="comment"> * @arg res_id nfnetlink resource id</span></div>
<div class="line"><a name="l00104"></a><span class="lineno"> 104</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00105"></a><span class="lineno"> 105</span> <span class="comment"> * @return Newly allocated netlink message or NULL.</span></div>
<div class="line"><a name="l00106"></a><span class="lineno"> 106</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00107"></a><span class="lineno"><a class="code" href="group__nfnl.html#gadf2f36b942b1c21ec892f0074463b8f1"> 107</a></span> <span class="keywordtype">int</span> <a class="code" href="group__nfnl.html#gadf2f36b942b1c21ec892f0074463b8f1" title="Send trivial netfilter netlink message.">nfnl_send_simple</a>(<span class="keyword">struct</span> nl_sock *sk, uint8_t subsys_id, uint8_t type,</div>
<div class="line"><a name="l00108"></a><span class="lineno"> 108</span>  <span class="keywordtype">int</span> flags, uint8_t family, uint16_t res_id)</div>
<div class="line"><a name="l00109"></a><span class="lineno"> 109</span> {</div>
<div class="line"><a name="l00110"></a><span class="lineno"> 110</span>  <span class="keyword">struct </span>nfgenmsg hdr = {</div>
<div class="line"><a name="l00111"></a><span class="lineno"> 111</span>  .nfgen_family = family,</div>
<div class="line"><a name="l00112"></a><span class="lineno"> 112</span>  .version = NFNETLINK_V0,</div>
<div class="line"><a name="l00113"></a><span class="lineno"> 113</span>  .res_id = htons(res_id),</div>
<div class="line"><a name="l00114"></a><span class="lineno"> 114</span>  };</div>
<div class="line"><a name="l00115"></a><span class="lineno"> 115</span> </div>
<div class="line"><a name="l00116"></a><span class="lineno"> 116</span>  <span class="keywordflow">return</span> <a class="code" href="group__send__recv.html#gafb5bcaba9d349cf699e4c8ce2c72aab8" title="Construct and transmit a Netlink message.">nl_send_simple</a>(sk, NFNLMSG_TYPE(subsys_id, type), flags,</div>
<div class="line"><a name="l00117"></a><span class="lineno"> 117</span>  &hdr, <span class="keyword">sizeof</span>(hdr));</div>
<div class="line"><a name="l00118"></a><span class="lineno"> 118</span> }</div>
<div class="line"><a name="l00119"></a><span class="lineno"> 119</span> <span class="comment"></span></div>
<div class="line"><a name="l00120"></a><span class="lineno"> 120</span> <span class="comment">/** @} */</span></div>
<div class="line"><a name="l00121"></a><span class="lineno"> 121</span> <span class="comment"></span></div>
<div class="line"><a name="l00122"></a><span class="lineno"> 122</span> <span class="comment">/**</span></div>
<div class="line"><a name="l00123"></a><span class="lineno"> 123</span> <span class="comment"> * @name Message Parsing</span></div>
<div class="line"><a name="l00124"></a><span class="lineno"> 124</span> <span class="comment"> * @{</span></div>
<div class="line"><a name="l00125"></a><span class="lineno"> 125</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00126"></a><span class="lineno"> 126</span> <span class="comment"></span></div>
<div class="line"><a name="l00127"></a><span class="lineno"> 127</span> <span class="comment">/**</span></div>
<div class="line"><a name="l00128"></a><span class="lineno"> 128</span> <span class="comment"> * Get netfilter subsystem id from message</span></div>
<div class="line"><a name="l00129"></a><span class="lineno"> 129</span> <span class="comment"> * @arg nlh netlink messsage header</span></div>
<div class="line"><a name="l00130"></a><span class="lineno"> 130</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00131"></a><span class="lineno"><a class="code" href="group__nfnl.html#ga8bf67cd1369d4b882a38bdfa27ffb02a"> 131</a></span> 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> nlmsghdr *nlh)</div>
<div class="line"><a name="l00132"></a><span class="lineno"> 132</span> {</div>
<div class="line"><a name="l00133"></a><span class="lineno"> 133</span>  <span class="keywordflow">return</span> NFNL_SUBSYS_ID(nlh->nlmsg_type);</div>
<div class="line"><a name="l00134"></a><span class="lineno"> 134</span> }</div>
<div class="line"><a name="l00135"></a><span class="lineno"> 135</span> <span class="comment"></span></div>
<div class="line"><a name="l00136"></a><span class="lineno"> 136</span> <span class="comment">/**</span></div>
<div class="line"><a name="l00137"></a><span class="lineno"> 137</span> <span class="comment"> * Get netfilter message type from message</span></div>
<div class="line"><a name="l00138"></a><span class="lineno"> 138</span> <span class="comment"> * @arg nlh netlink messsage header</span></div>
<div class="line"><a name="l00139"></a><span class="lineno"> 139</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00140"></a><span class="lineno"><a class="code" href="group__nfnl.html#gaf1bb10eb2462b46f2a4bf48d1a0e0c33"> 140</a></span> 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> nlmsghdr *nlh)</div>
<div class="line"><a name="l00141"></a><span class="lineno"> 141</span> {</div>
<div class="line"><a name="l00142"></a><span class="lineno"> 142</span>  <span class="keywordflow">return</span> NFNL_MSG_TYPE(nlh->nlmsg_type);</div>
<div class="line"><a name="l00143"></a><span class="lineno"> 143</span> }</div>
<div class="line"><a name="l00144"></a><span class="lineno"> 144</span> <span class="comment"></span></div>
<div class="line"><a name="l00145"></a><span class="lineno"> 145</span> <span class="comment">/**</span></div>
<div class="line"><a name="l00146"></a><span class="lineno"> 146</span> <span class="comment"> * Get netfilter family from message</span></div>
<div class="line"><a name="l00147"></a><span class="lineno"> 147</span> <span class="comment"> * @arg nlh netlink messsage header</span></div>
<div class="line"><a name="l00148"></a><span class="lineno"> 148</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00149"></a><span class="lineno"><a class="code" href="group__nfnl.html#ga91b2b1c9b8e243fe070229ef3fff3d6c"> 149</a></span> uint8_t <a class="code" href="group__nfnl.html#ga91b2b1c9b8e243fe070229ef3fff3d6c" title="Get netfilter family from message.">nfnlmsg_family</a>(<span class="keyword">struct</span> nlmsghdr *nlh)</div>
<div class="line"><a name="l00150"></a><span class="lineno"> 150</span> {</div>
<div class="line"><a name="l00151"></a><span class="lineno"> 151</span>  <span class="keyword">struct </span>nfgenmsg *nfg = <a class="code" href="group__msg.html#gae44a904bb40c8b5f5ff31539c21cfa5a" title="Return pointer to message payload.">nlmsg_data</a>(nlh);</div>
<div class="line"><a name="l00152"></a><span class="lineno"> 152</span> </div>
<div class="line"><a name="l00153"></a><span class="lineno"> 153</span>  <span class="keywordflow">return</span> nfg->nfgen_family;</div>
<div class="line"><a name="l00154"></a><span class="lineno"> 154</span> }</div>
<div class="line"><a name="l00155"></a><span class="lineno"> 155</span> <span class="comment"></span></div>
<div class="line"><a name="l00156"></a><span class="lineno"> 156</span> <span class="comment">/**</span></div>
<div class="line"><a name="l00157"></a><span class="lineno"> 157</span> <span class="comment"> * Get netfilter resource id from message</span></div>
<div class="line"><a name="l00158"></a><span class="lineno"> 158</span> <span class="comment"> * @arg nlh netlink messsage header</span></div>
<div class="line"><a name="l00159"></a><span class="lineno"> 159</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00160"></a><span class="lineno"><a class="code" href="group__nfnl.html#ga81d2b6a0cdc1ad5a48a15d536c0a8a6d"> 160</a></span> 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> nlmsghdr *nlh)</div>
<div class="line"><a name="l00161"></a><span class="lineno"> 161</span> {</div>
<div class="line"><a name="l00162"></a><span class="lineno"> 162</span>  <span class="keyword">struct </span>nfgenmsg *nfg = <a class="code" href="group__msg.html#gae44a904bb40c8b5f5ff31539c21cfa5a" title="Return pointer to message payload.">nlmsg_data</a>(nlh);</div>
<div class="line"><a name="l00163"></a><span class="lineno"> 163</span> </div>
<div class="line"><a name="l00164"></a><span class="lineno"> 164</span>  <span class="keywordflow">return</span> ntohs(nfg->res_id);</div>
<div class="line"><a name="l00165"></a><span class="lineno"> 165</span> }</div>
<div class="line"><a name="l00166"></a><span class="lineno"> 166</span> <span class="comment"></span></div>
<div class="line"><a name="l00167"></a><span class="lineno"> 167</span> <span class="comment">/** @} */</span></div>
<div class="line"><a name="l00168"></a><span class="lineno"> 168</span> <span class="comment"></span></div>
<div class="line"><a name="l00169"></a><span class="lineno"> 169</span> <span class="comment">/**</span></div>
<div class="line"><a name="l00170"></a><span class="lineno"> 170</span> <span class="comment"> * @name Message Building</span></div>
<div class="line"><a name="l00171"></a><span class="lineno"> 171</span> <span class="comment"> * @{</span></div>
<div class="line"><a name="l00172"></a><span class="lineno"> 172</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00173"></a><span class="lineno"> 173</span> </div>
<div class="line"><a name="l00174"></a><span class="lineno"> 174</span> <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)</div>
<div class="line"><a name="l00175"></a><span class="lineno"> 175</span> {</div>
<div class="line"><a name="l00176"></a><span class="lineno"> 176</span>  <span class="keyword">struct </span>nfgenmsg *nfg;</div>
<div class="line"><a name="l00177"></a><span class="lineno"> 177</span> </div>
<div class="line"><a name="l00178"></a><span class="lineno"> 178</span>  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);</div>
<div class="line"><a name="l00179"></a><span class="lineno"> 179</span>  <span class="keywordflow">if</span> (nfg == NULL)</div>
<div class="line"><a name="l00180"></a><span class="lineno"> 180</span>  <span class="keywordflow">return</span> -NLE_NOMEM;</div>
<div class="line"><a name="l00181"></a><span class="lineno"> 181</span> </div>
<div class="line"><a name="l00182"></a><span class="lineno"> 182</span>  nfg->nfgen_family = family;</div>
<div class="line"><a name="l00183"></a><span class="lineno"> 183</span>  nfg->version = NFNETLINK_V0;</div>
<div class="line"><a name="l00184"></a><span class="lineno"> 184</span>  nfg->res_id = htons(res_id);</div>
<div class="line"><a name="l00185"></a><span class="lineno"> 185</span>  NL_DBG(2, <span class="stringliteral">"msg %p: Added nfnetlink header family=%d res_id=%d\n"</span>,</div>
<div class="line"><a name="l00186"></a><span class="lineno"> 186</span>  msg, family, res_id);</div>
<div class="line"><a name="l00187"></a><span class="lineno"> 187</span>  <span class="keywordflow">return</span> 0;</div>
<div class="line"><a name="l00188"></a><span class="lineno"> 188</span> }</div>
<div class="line"><a name="l00189"></a><span class="lineno"> 189</span> <span class="comment"></span></div>
<div class="line"><a name="l00190"></a><span class="lineno"> 190</span> <span class="comment">/**</span></div>
<div class="line"><a name="l00191"></a><span class="lineno"> 191</span> <span class="comment"> * Allocate a new netfilter netlink message</span></div>
<div class="line"><a name="l00192"></a><span class="lineno"> 192</span> <span class="comment"> * @arg subsys_id nfnetlink subsystem</span></div>
<div class="line"><a name="l00193"></a><span class="lineno"> 193</span> <span class="comment"> * @arg type nfnetlink message type</span></div>
<div class="line"><a name="l00194"></a><span class="lineno"> 194</span> <span class="comment"> * @arg flags message flags</span></div>
<div class="line"><a name="l00195"></a><span class="lineno"> 195</span> <span class="comment"> * @arg family nfnetlink address family</span></div>
<div class="line"><a name="l00196"></a><span class="lineno"> 196</span> <span class="comment"> * @arg res_id nfnetlink resource id</span></div>
<div class="line"><a name="l00197"></a><span class="lineno"> 197</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00198"></a><span class="lineno"> 198</span> <span class="comment"> * @return Newly allocated netlink message or NULL.</span></div>
<div class="line"><a name="l00199"></a><span class="lineno"> 199</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00200"></a><span class="lineno"><a class="code" href="group__nfnl.html#gaf2c5b1fb596e8fdb62eb782496ac88c3"> 200</a></span> <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,</div>
<div class="line"><a name="l00201"></a><span class="lineno"> 201</span>  uint8_t family, uint16_t res_id)</div>
<div class="line"><a name="l00202"></a><span class="lineno"> 202</span> {</div>
<div class="line"><a name="l00203"></a><span class="lineno"> 203</span>  <span class="keyword">struct </span>nl_msg *msg;</div>
<div class="line"><a name="l00204"></a><span class="lineno"> 204</span> </div>
<div class="line"><a name="l00205"></a><span class="lineno"> 205</span>  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);</div>
<div class="line"><a name="l00206"></a><span class="lineno"> 206</span>  <span class="keywordflow">if</span> (msg == NULL)</div>
<div class="line"><a name="l00207"></a><span class="lineno"> 207</span>  <span class="keywordflow">return</span> NULL;</div>
<div class="line"><a name="l00208"></a><span class="lineno"> 208</span> </div>
<div class="line"><a name="l00209"></a><span class="lineno"> 209</span>  <span class="keywordflow">if</span> (nfnlmsg_append(msg, family, res_id) < 0)</div>
<div class="line"><a name="l00210"></a><span class="lineno"> 210</span>  <span class="keywordflow">goto</span> nla_put_failure;</div>
<div class="line"><a name="l00211"></a><span class="lineno"> 211</span> </div>
<div class="line"><a name="l00212"></a><span class="lineno"> 212</span>  <span class="keywordflow">return</span> msg;</div>
<div class="line"><a name="l00213"></a><span class="lineno"> 213</span> </div>
<div class="line"><a name="l00214"></a><span class="lineno"> 214</span> nla_put_failure:</div>
<div class="line"><a name="l00215"></a><span class="lineno"> 215</span>  <a class="code" href="group__msg.html#ga6fb0fda0b5fdc99c786d65cb9c53c6bc" title="Release a reference from an netlink message.">nlmsg_free</a>(msg);</div>
<div class="line"><a name="l00216"></a><span class="lineno"> 216</span>  <span class="keywordflow">return</span> NULL;</div>
<div class="line"><a name="l00217"></a><span class="lineno"> 217</span> }</div>
<div class="line"><a name="l00218"></a><span class="lineno"> 218</span> <span class="comment"></span></div>
<div class="line"><a name="l00219"></a><span class="lineno"> 219</span> <span class="comment">/**</span></div>
<div class="line"><a name="l00220"></a><span class="lineno"> 220</span> <span class="comment"> * Add netlink and netfilter netlink headers to netlink message</span></div>
<div class="line"><a name="l00221"></a><span class="lineno"> 221</span> <span class="comment"> * @arg msg netlink message</span></div>
<div class="line"><a name="l00222"></a><span class="lineno"> 222</span> <span class="comment"> * @arg pid netlink process id</span></div>
<div class="line"><a name="l00223"></a><span class="lineno"> 223</span> <span class="comment"> * @arg seq sequence number of message</span></div>
<div class="line"><a name="l00224"></a><span class="lineno"> 224</span> <span class="comment"> * @arg subsys_id nfnetlink subsystem</span></div>
<div class="line"><a name="l00225"></a><span class="lineno"> 225</span> <span class="comment"> * @arg type nfnetlink message type</span></div>
<div class="line"><a name="l00226"></a><span class="lineno"> 226</span> <span class="comment"> * @arg flags message flags</span></div>
<div class="line"><a name="l00227"></a><span class="lineno"> 227</span> <span class="comment"> * @arg family nfnetlink address family</span></div>
<div class="line"><a name="l00228"></a><span class="lineno"> 228</span> <span class="comment"> * @arg res_id nfnetlink resource id</span></div>
<div class="line"><a name="l00229"></a><span class="lineno"> 229</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00230"></a><span class="lineno"><a class="code" href="group__nfnl.html#ga94e6a82031c8e4cecca7140e2d0a62f4"> 230</a></span> <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,</div>
<div class="line"><a name="l00231"></a><span class="lineno"> 231</span>  uint8_t subsys_id, uint8_t type, <span class="keywordtype">int</span> flags, uint8_t family,</div>
<div class="line"><a name="l00232"></a><span class="lineno"> 232</span>  uint16_t res_id)</div>
<div class="line"><a name="l00233"></a><span class="lineno"> 233</span> {</div>
<div class="line"><a name="l00234"></a><span class="lineno"> 234</span>  <span class="keyword">struct </span>nlmsghdr *nlh;</div>
<div class="line"><a name="l00235"></a><span class="lineno"> 235</span> </div>
<div class="line"><a name="l00236"></a><span class="lineno"> 236</span>  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);</div>
<div class="line"><a name="l00237"></a><span class="lineno"> 237</span>  <span class="keywordflow">if</span> (nlh == NULL)</div>
<div class="line"><a name="l00238"></a><span class="lineno"> 238</span>  <span class="keywordflow">return</span> -NLE_MSGSIZE;</div>
<div class="line"><a name="l00239"></a><span class="lineno"> 239</span> </div>
<div class="line"><a name="l00240"></a><span class="lineno"> 240</span>  <span class="keywordflow">return</span> nfnlmsg_append(msg, family, res_id);</div>
<div class="line"><a name="l00241"></a><span class="lineno"> 241</span> }</div>
<div class="line"><a name="l00242"></a><span class="lineno"> 242</span> <span class="comment"></span></div>
<div class="line"><a name="l00243"></a><span class="lineno"> 243</span> <span class="comment">/** @} */</span></div>
<div class="line"><a name="l00244"></a><span class="lineno"> 244</span> <span class="comment"></span></div>
<div class="line"><a name="l00245"></a><span class="lineno"> 245</span> <span class="comment">/** @} */</span></div>
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