1 | #include <freebsd/machine/rtems-bsd-config.h> |
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2 | |
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3 | /*- |
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4 | * Copyright (c) 1982, 1986, 1993 |
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5 | * The Regents of the University of California. All rights reserved. |
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6 | * |
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7 | * Redistribution and use in source and binary forms, with or without |
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8 | * modification, are permitted provided that the following conditions |
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9 | * are met: |
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10 | * 1. Redistributions of source code must retain the above copyright |
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11 | * notice, this list of conditions and the following disclaimer. |
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12 | * 2. Redistributions in binary form must reproduce the above copyright |
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13 | * notice, this list of conditions and the following disclaimer in the |
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14 | * documentation and/or other materials provided with the distribution. |
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15 | * 4. Neither the name of the University nor the names of its contributors |
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16 | * may be used to endorse or promote products derived from this software |
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17 | * without specific prior written permission. |
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18 | * |
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19 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
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20 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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21 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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22 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
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23 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
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24 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
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25 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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26 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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27 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
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28 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
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29 | * SUCH DAMAGE. |
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30 | * |
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31 | * @(#)uipc_domain.c 8.2 (Berkeley) 10/18/93 |
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32 | */ |
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33 | |
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34 | #include <freebsd/sys/cdefs.h> |
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35 | __FBSDID("$FreeBSD$"); |
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36 | |
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37 | #include <freebsd/sys/param.h> |
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38 | #include <freebsd/sys/socket.h> |
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39 | #include <freebsd/sys/protosw.h> |
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40 | #include <freebsd/sys/domain.h> |
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41 | #include <freebsd/sys/eventhandler.h> |
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42 | #include <freebsd/sys/mbuf.h> |
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43 | #include <freebsd/sys/kernel.h> |
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44 | #include <freebsd/sys/lock.h> |
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45 | #include <freebsd/sys/mutex.h> |
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46 | #include <freebsd/sys/socketvar.h> |
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47 | #include <freebsd/sys/systm.h> |
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48 | |
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49 | #include <freebsd/net/vnet.h> |
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50 | |
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51 | #include <freebsd/vm/uma.h> |
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52 | |
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53 | /* |
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54 | * System initialization |
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55 | * |
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56 | * Note: domain initialization takes place on a per domain basis |
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57 | * as a result of traversing a SYSINIT linker set. Most likely, |
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58 | * each domain would want to call DOMAIN_SET(9) itself, which |
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59 | * would cause the domain to be added just after domaininit() |
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60 | * is called during startup. |
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61 | * |
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62 | * See DOMAIN_SET(9) for details on its use. |
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63 | */ |
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64 | |
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65 | static void domaininit(void *); |
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66 | SYSINIT(domain, SI_SUB_PROTO_DOMAININIT, SI_ORDER_ANY, domaininit, NULL); |
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67 | |
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68 | static void domainfinalize(void *); |
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69 | SYSINIT(domainfin, SI_SUB_PROTO_IFATTACHDOMAIN, SI_ORDER_FIRST, domainfinalize, |
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70 | NULL); |
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71 | |
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72 | static struct callout pffast_callout; |
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73 | static struct callout pfslow_callout; |
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74 | |
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75 | static void pffasttimo(void *); |
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76 | static void pfslowtimo(void *); |
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77 | |
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78 | struct domain *domains; /* registered protocol domains */ |
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79 | int domain_init_status = 0; |
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80 | static struct mtx dom_mtx; /* domain list lock */ |
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81 | MTX_SYSINIT(domain, &dom_mtx, "domain list", MTX_DEF); |
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82 | |
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83 | /* |
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84 | * Dummy protocol specific user requests function pointer array. |
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85 | * All functions return EOPNOTSUPP. |
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86 | */ |
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87 | struct pr_usrreqs nousrreqs = { |
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88 | .pru_accept = pru_accept_notsupp, |
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89 | .pru_attach = pru_attach_notsupp, |
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90 | .pru_bind = pru_bind_notsupp, |
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91 | .pru_connect = pru_connect_notsupp, |
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92 | .pru_connect2 = pru_connect2_notsupp, |
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93 | .pru_control = pru_control_notsupp, |
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94 | .pru_disconnect = pru_disconnect_notsupp, |
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95 | .pru_listen = pru_listen_notsupp, |
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96 | .pru_peeraddr = pru_peeraddr_notsupp, |
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97 | .pru_rcvd = pru_rcvd_notsupp, |
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98 | .pru_rcvoob = pru_rcvoob_notsupp, |
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99 | .pru_send = pru_send_notsupp, |
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100 | .pru_sense = pru_sense_null, |
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101 | .pru_shutdown = pru_shutdown_notsupp, |
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102 | .pru_sockaddr = pru_sockaddr_notsupp, |
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103 | .pru_sosend = pru_sosend_notsupp, |
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104 | .pru_soreceive = pru_soreceive_notsupp, |
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105 | .pru_sopoll = pru_sopoll_notsupp, |
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106 | }; |
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107 | |
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108 | static void |
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109 | protosw_init(struct protosw *pr) |
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110 | { |
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111 | struct pr_usrreqs *pu; |
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112 | |
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113 | pu = pr->pr_usrreqs; |
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114 | KASSERT(pu != NULL, ("protosw_init: %ssw[%d] has no usrreqs!", |
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115 | pr->pr_domain->dom_name, |
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116 | (int)(pr - pr->pr_domain->dom_protosw))); |
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117 | |
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118 | /* |
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119 | * Protocol switch methods fall into three categories: mandatory, |
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120 | * mandatory but protosw_init() provides a default, and optional. |
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121 | * |
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122 | * For true protocols (i.e., pru_attach != NULL), KASSERT truly |
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123 | * mandatory methods with no defaults, and initialize defaults for |
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124 | * other mandatory methods if the protocol hasn't defined an |
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125 | * implementation (NULL function pointer). |
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126 | */ |
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127 | #if 0 |
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128 | if (pu->pru_attach != NULL) { |
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129 | KASSERT(pu->pru_abort != NULL, |
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130 | ("protosw_init: %ssw[%d] pru_abort NULL", |
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131 | pr->pr_domain->dom_name, |
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132 | (int)(pr - pr->pr_domain->dom_protosw))); |
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133 | KASSERT(pu->pru_send != NULL, |
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134 | ("protosw_init: %ssw[%d] pru_send NULL", |
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135 | pr->pr_domain->dom_name, |
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136 | (int)(pr - pr->pr_domain->dom_protosw))); |
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137 | } |
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138 | #endif |
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139 | |
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140 | #define DEFAULT(foo, bar) if ((foo) == NULL) (foo) = (bar) |
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141 | DEFAULT(pu->pru_accept, pru_accept_notsupp); |
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142 | DEFAULT(pu->pru_bind, pru_bind_notsupp); |
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143 | DEFAULT(pu->pru_connect, pru_connect_notsupp); |
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144 | DEFAULT(pu->pru_connect2, pru_connect2_notsupp); |
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145 | DEFAULT(pu->pru_control, pru_control_notsupp); |
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146 | DEFAULT(pu->pru_disconnect, pru_disconnect_notsupp); |
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147 | DEFAULT(pu->pru_listen, pru_listen_notsupp); |
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148 | DEFAULT(pu->pru_peeraddr, pru_peeraddr_notsupp); |
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149 | DEFAULT(pu->pru_rcvd, pru_rcvd_notsupp); |
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150 | DEFAULT(pu->pru_rcvoob, pru_rcvoob_notsupp); |
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151 | DEFAULT(pu->pru_sense, pru_sense_null); |
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152 | DEFAULT(pu->pru_shutdown, pru_shutdown_notsupp); |
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153 | DEFAULT(pu->pru_sockaddr, pru_sockaddr_notsupp); |
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154 | DEFAULT(pu->pru_sosend, sosend_generic); |
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155 | DEFAULT(pu->pru_soreceive, soreceive_generic); |
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156 | DEFAULT(pu->pru_sopoll, sopoll_generic); |
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157 | #undef DEFAULT |
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158 | if (pr->pr_init) |
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159 | (*pr->pr_init)(); |
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160 | } |
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161 | |
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162 | /* |
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163 | * Add a new protocol domain to the list of supported domains |
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164 | * Note: you cant unload it again because a socket may be using it. |
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165 | * XXX can't fail at this time. |
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166 | */ |
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167 | void |
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168 | domain_init(void *arg) |
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169 | { |
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170 | struct domain *dp = arg; |
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171 | struct protosw *pr; |
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172 | |
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173 | if (dp->dom_init) |
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174 | (*dp->dom_init)(); |
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175 | for (pr = dp->dom_protosw; pr < dp->dom_protoswNPROTOSW; pr++) |
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176 | protosw_init(pr); |
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177 | /* |
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178 | * update global information about maximums |
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179 | */ |
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180 | max_hdr = max_linkhdr + max_protohdr; |
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181 | max_datalen = MHLEN - max_hdr; |
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182 | if (max_datalen < 1) |
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183 | panic("%s: max_datalen < 1", __func__); |
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184 | } |
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185 | |
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186 | #ifdef VIMAGE |
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187 | void |
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188 | vnet_domain_init(void *arg) |
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189 | { |
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190 | |
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191 | /* Virtualized case is no different -- call init functions. */ |
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192 | domain_init(arg); |
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193 | } |
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194 | |
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195 | void |
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196 | vnet_domain_uninit(void *arg) |
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197 | { |
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198 | struct domain *dp = arg; |
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199 | struct protosw *pr; |
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200 | |
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201 | for (pr = dp->dom_protosw; pr < dp->dom_protoswNPROTOSW; pr++) |
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202 | if (pr->pr_destroy) |
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203 | (*pr->pr_destroy)(); |
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204 | if (dp->dom_destroy) |
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205 | (*dp->dom_destroy)(); |
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206 | } |
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207 | #endif |
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208 | |
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209 | /* |
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210 | * Add a new protocol domain to the list of supported domains |
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211 | * Note: you cant unload it again because a socket may be using it. |
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212 | * XXX can't fail at this time. |
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213 | */ |
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214 | void |
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215 | domain_add(void *data) |
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216 | { |
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217 | struct domain *dp; |
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218 | |
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219 | dp = (struct domain *)data; |
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220 | mtx_lock(&dom_mtx); |
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221 | dp->dom_next = domains; |
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222 | domains = dp; |
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223 | |
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224 | KASSERT(domain_init_status >= 1, |
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225 | ("attempt to net_add_domain(%s) before domaininit()", |
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226 | dp->dom_name)); |
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227 | #ifndef INVARIANTS |
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228 | if (domain_init_status < 1) |
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229 | printf("WARNING: attempt to domain_add(%s) before " |
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230 | "domaininit()\n", dp->dom_name); |
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231 | #endif |
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232 | #ifdef notyet |
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233 | KASSERT(domain_init_status < 2, |
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234 | ("attempt to domain_add(%s) after domainfinalize()", |
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235 | dp->dom_name)); |
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236 | #else |
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237 | if (domain_init_status >= 2) |
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238 | printf("WARNING: attempt to domain_add(%s) after " |
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239 | "domainfinalize()\n", dp->dom_name); |
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240 | #endif |
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241 | mtx_unlock(&dom_mtx); |
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242 | } |
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243 | |
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244 | static void |
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245 | socket_zone_change(void *tag) |
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246 | { |
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247 | |
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248 | uma_zone_set_max(socket_zone, maxsockets); |
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249 | } |
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250 | |
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251 | /* ARGSUSED*/ |
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252 | static void |
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253 | domaininit(void *dummy) |
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254 | { |
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255 | |
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256 | /* |
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257 | * Before we do any setup, make sure to initialize the |
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258 | * zone allocator we get struct sockets from. |
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259 | */ |
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260 | socket_zone = uma_zcreate("socket", sizeof(struct socket), NULL, NULL, |
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261 | NULL, NULL, UMA_ALIGN_PTR, UMA_ZONE_NOFREE); |
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262 | uma_zone_set_max(socket_zone, maxsockets); |
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263 | EVENTHANDLER_REGISTER(maxsockets_change, socket_zone_change, NULL, |
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264 | EVENTHANDLER_PRI_FIRST); |
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265 | #ifndef __rtems__ |
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266 | if (max_linkhdr < 16) /* XXX */ |
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267 | max_linkhdr = 16; |
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268 | #else /*__rtems__ */ |
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269 | if (max_linkhdr < 10) /* XXX -- Not sure this is correct*/ |
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270 | max_linkhdr = 10; |
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271 | #endif /*__rtems__ */ |
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272 | |
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273 | callout_init(&pffast_callout, CALLOUT_MPSAFE); |
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274 | callout_init(&pfslow_callout, CALLOUT_MPSAFE); |
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275 | |
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276 | mtx_lock(&dom_mtx); |
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277 | KASSERT(domain_init_status == 0, ("domaininit called too late!")); |
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278 | domain_init_status = 1; |
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279 | mtx_unlock(&dom_mtx); |
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280 | } |
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281 | |
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282 | /* ARGSUSED*/ |
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283 | static void |
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284 | domainfinalize(void *dummy) |
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285 | { |
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286 | |
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287 | mtx_lock(&dom_mtx); |
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288 | KASSERT(domain_init_status == 1, ("domainfinalize called too late!")); |
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289 | domain_init_status = 2; |
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290 | mtx_unlock(&dom_mtx); |
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291 | |
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292 | callout_reset(&pffast_callout, 1, pffasttimo, NULL); |
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293 | callout_reset(&pfslow_callout, 1, pfslowtimo, NULL); |
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294 | } |
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295 | |
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296 | struct protosw * |
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297 | pffindtype(int family, int type) |
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298 | { |
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299 | struct domain *dp; |
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300 | struct protosw *pr; |
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301 | |
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302 | for (dp = domains; dp; dp = dp->dom_next) |
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303 | if (dp->dom_family == family) |
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304 | goto found; |
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305 | return (0); |
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306 | found: |
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307 | for (pr = dp->dom_protosw; pr < dp->dom_protoswNPROTOSW; pr++) |
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308 | if (pr->pr_type && pr->pr_type == type) |
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309 | return (pr); |
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310 | return (0); |
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311 | } |
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312 | |
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313 | struct protosw * |
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314 | pffindproto(int family, int protocol, int type) |
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315 | { |
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316 | struct domain *dp; |
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317 | struct protosw *pr; |
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318 | struct protosw *maybe = 0; |
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319 | |
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320 | if (family == 0) |
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321 | return (0); |
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322 | for (dp = domains; dp; dp = dp->dom_next) |
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323 | if (dp->dom_family == family) |
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324 | goto found; |
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325 | return (0); |
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326 | found: |
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327 | for (pr = dp->dom_protosw; pr < dp->dom_protoswNPROTOSW; pr++) { |
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328 | if ((pr->pr_protocol == protocol) && (pr->pr_type == type)) |
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329 | return (pr); |
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330 | |
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331 | if (type == SOCK_RAW && pr->pr_type == SOCK_RAW && |
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332 | pr->pr_protocol == 0 && maybe == (struct protosw *)0) |
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333 | maybe = pr; |
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334 | } |
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335 | return (maybe); |
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336 | } |
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337 | |
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338 | /* |
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339 | * The caller must make sure that the new protocol is fully set up and ready to |
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340 | * accept requests before it is registered. |
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341 | */ |
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342 | int |
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343 | pf_proto_register(int family, struct protosw *npr) |
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344 | { |
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345 | VNET_ITERATOR_DECL(vnet_iter); |
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346 | struct domain *dp; |
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347 | struct protosw *pr, *fpr; |
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348 | |
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349 | /* Sanity checks. */ |
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350 | if (family == 0) |
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351 | return (EPFNOSUPPORT); |
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352 | if (npr->pr_type == 0) |
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353 | return (EPROTOTYPE); |
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354 | if (npr->pr_protocol == 0) |
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355 | return (EPROTONOSUPPORT); |
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356 | if (npr->pr_usrreqs == NULL) |
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357 | return (ENXIO); |
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358 | |
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359 | /* Try to find the specified domain based on the family. */ |
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360 | for (dp = domains; dp; dp = dp->dom_next) |
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361 | if (dp->dom_family == family) |
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362 | goto found; |
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363 | return (EPFNOSUPPORT); |
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364 | |
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365 | found: |
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366 | /* Initialize backpointer to struct domain. */ |
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367 | npr->pr_domain = dp; |
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368 | fpr = NULL; |
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369 | |
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370 | /* |
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371 | * Protect us against races when two protocol registrations for |
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372 | * the same protocol happen at the same time. |
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373 | */ |
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374 | mtx_lock(&dom_mtx); |
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375 | |
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376 | /* The new protocol must not yet exist. */ |
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377 | for (pr = dp->dom_protosw; pr < dp->dom_protoswNPROTOSW; pr++) { |
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378 | if ((pr->pr_type == npr->pr_type) && |
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379 | (pr->pr_protocol == npr->pr_protocol)) { |
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380 | mtx_unlock(&dom_mtx); |
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381 | return (EEXIST); /* XXX: Check only protocol? */ |
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382 | } |
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383 | /* While here, remember the first free spacer. */ |
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384 | if ((fpr == NULL) && (pr->pr_protocol == PROTO_SPACER)) |
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385 | fpr = pr; |
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386 | } |
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387 | |
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388 | /* If no free spacer is found we can't add the new protocol. */ |
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389 | if (fpr == NULL) { |
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390 | mtx_unlock(&dom_mtx); |
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391 | return (ENOMEM); |
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392 | } |
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393 | |
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394 | /* Copy the new struct protosw over the spacer. */ |
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395 | bcopy(npr, fpr, sizeof(*fpr)); |
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396 | |
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397 | /* Job is done, no more protection required. */ |
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398 | mtx_unlock(&dom_mtx); |
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399 | |
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400 | /* Initialize and activate the protocol. */ |
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401 | VNET_LIST_RLOCK(); |
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402 | VNET_FOREACH(vnet_iter) { |
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403 | CURVNET_SET_QUIET(vnet_iter); |
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404 | protosw_init(fpr); |
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405 | CURVNET_RESTORE(); |
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406 | } |
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407 | VNET_LIST_RUNLOCK(); |
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408 | |
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409 | return (0); |
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410 | } |
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411 | |
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412 | /* |
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413 | * The caller must make sure the protocol and its functions correctly shut down |
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414 | * all sockets and release all locks and memory references. |
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415 | */ |
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416 | int |
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417 | pf_proto_unregister(int family, int protocol, int type) |
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418 | { |
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419 | struct domain *dp; |
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420 | struct protosw *pr, *dpr; |
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421 | |
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422 | /* Sanity checks. */ |
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423 | if (family == 0) |
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424 | return (EPFNOSUPPORT); |
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425 | if (protocol == 0) |
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426 | return (EPROTONOSUPPORT); |
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427 | if (type == 0) |
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428 | return (EPROTOTYPE); |
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429 | |
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430 | /* Try to find the specified domain based on the family type. */ |
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431 | for (dp = domains; dp; dp = dp->dom_next) |
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432 | if (dp->dom_family == family) |
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433 | goto found; |
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434 | return (EPFNOSUPPORT); |
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435 | |
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436 | found: |
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437 | dpr = NULL; |
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438 | |
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439 | /* Lock out everyone else while we are manipulating the protosw. */ |
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440 | mtx_lock(&dom_mtx); |
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441 | |
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442 | /* The protocol must exist and only once. */ |
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443 | for (pr = dp->dom_protosw; pr < dp->dom_protoswNPROTOSW; pr++) { |
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444 | if ((pr->pr_type == type) && (pr->pr_protocol == protocol)) { |
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445 | if (dpr != NULL) { |
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446 | mtx_unlock(&dom_mtx); |
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447 | return (EMLINK); /* Should not happen! */ |
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448 | } else |
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449 | dpr = pr; |
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450 | } |
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451 | } |
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452 | |
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453 | /* Protocol does not exist. */ |
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454 | if (dpr == NULL) { |
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455 | mtx_unlock(&dom_mtx); |
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456 | return (EPROTONOSUPPORT); |
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457 | } |
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458 | |
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459 | /* De-orbit the protocol and make the slot available again. */ |
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460 | dpr->pr_type = 0; |
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461 | dpr->pr_domain = dp; |
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462 | dpr->pr_protocol = PROTO_SPACER; |
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463 | dpr->pr_flags = 0; |
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464 | dpr->pr_input = NULL; |
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465 | dpr->pr_output = NULL; |
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466 | dpr->pr_ctlinput = NULL; |
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467 | dpr->pr_ctloutput = NULL; |
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468 | dpr->pr_init = NULL; |
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469 | dpr->pr_fasttimo = NULL; |
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470 | dpr->pr_slowtimo = NULL; |
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471 | dpr->pr_drain = NULL; |
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472 | dpr->pr_usrreqs = &nousrreqs; |
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473 | |
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474 | /* Job is done, not more protection required. */ |
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475 | mtx_unlock(&dom_mtx); |
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476 | |
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477 | return (0); |
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478 | } |
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479 | |
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480 | void |
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481 | pfctlinput(int cmd, struct sockaddr *sa) |
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482 | { |
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483 | struct domain *dp; |
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484 | struct protosw *pr; |
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485 | |
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486 | for (dp = domains; dp; dp = dp->dom_next) |
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487 | for (pr = dp->dom_protosw; pr < dp->dom_protoswNPROTOSW; pr++) |
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488 | if (pr->pr_ctlinput) |
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489 | (*pr->pr_ctlinput)(cmd, sa, (void *)0); |
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490 | } |
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491 | |
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492 | void |
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493 | pfctlinput2(int cmd, struct sockaddr *sa, void *ctlparam) |
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494 | { |
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495 | struct domain *dp; |
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496 | struct protosw *pr; |
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497 | |
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498 | if (!sa) |
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499 | return; |
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500 | for (dp = domains; dp; dp = dp->dom_next) { |
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501 | /* |
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502 | * the check must be made by xx_ctlinput() anyways, to |
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503 | * make sure we use data item pointed to by ctlparam in |
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504 | * correct way. the following check is made just for safety. |
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505 | */ |
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506 | if (dp->dom_family != sa->sa_family) |
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507 | continue; |
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508 | |
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509 | for (pr = dp->dom_protosw; pr < dp->dom_protoswNPROTOSW; pr++) |
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510 | if (pr->pr_ctlinput) |
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511 | (*pr->pr_ctlinput)(cmd, sa, ctlparam); |
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512 | } |
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513 | } |
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514 | |
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515 | static void |
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516 | pfslowtimo(void *arg) |
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517 | { |
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518 | struct domain *dp; |
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519 | struct protosw *pr; |
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520 | |
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521 | for (dp = domains; dp; dp = dp->dom_next) |
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522 | for (pr = dp->dom_protosw; pr < dp->dom_protoswNPROTOSW; pr++) |
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523 | if (pr->pr_slowtimo) |
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524 | (*pr->pr_slowtimo)(); |
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525 | callout_reset(&pfslow_callout, hz/2, pfslowtimo, NULL); |
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526 | } |
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527 | |
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528 | static void |
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529 | pffasttimo(void *arg) |
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530 | { |
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531 | struct domain *dp; |
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532 | struct protosw *pr; |
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533 | |
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534 | for (dp = domains; dp; dp = dp->dom_next) |
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535 | for (pr = dp->dom_protosw; pr < dp->dom_protoswNPROTOSW; pr++) |
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536 | if (pr->pr_fasttimo) |
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537 | (*pr->pr_fasttimo)(); |
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538 | callout_reset(&pffast_callout, hz/5, pffasttimo, NULL); |
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539 | } |
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