1 | #include <machine/rtems-bsd-config.h> |
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2 | |
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3 | /*- |
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4 | * Copyright (c) 1982, 1986, 1991, 1993, 1995 |
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5 | * The Regents of the University of California. |
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6 | * Copyright (c) 2007-2009 Robert N. M. Watson |
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7 | * All rights reserved. |
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8 | * |
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9 | * Redistribution and use in source and binary forms, with or without |
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10 | * modification, are permitted provided that the following conditions |
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11 | * are met: |
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12 | * 1. Redistributions of source code must retain the above copyright |
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13 | * notice, this list of conditions and the following disclaimer. |
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14 | * 2. Redistributions in binary form must reproduce the above copyright |
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15 | * notice, this list of conditions and the following disclaimer in the |
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16 | * documentation and/or other materials provided with the distribution. |
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17 | * 4. Neither the name of the University nor the names of its contributors |
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18 | * may be used to endorse or promote products derived from this software |
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19 | * without specific prior written permission. |
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20 | * |
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21 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
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22 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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23 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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24 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
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25 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
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26 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
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27 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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28 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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29 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
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30 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
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31 | * SUCH DAMAGE. |
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32 | * |
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33 | * @(#)in_pcb.c 8.4 (Berkeley) 5/24/95 |
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34 | */ |
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35 | |
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36 | #ifdef __rtems__ |
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37 | #include <errno.h> |
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38 | #undef errno |
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39 | #endif /* __rtems__ */ |
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40 | #include <sys/cdefs.h> |
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41 | __FBSDID("$FreeBSD$"); |
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42 | |
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43 | #include <rtems/bsd/local/opt_ddb.h> |
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44 | #include <rtems/bsd/local/opt_ipsec.h> |
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45 | #include <rtems/bsd/local/opt_inet6.h> |
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46 | |
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47 | #include <rtems/bsd/sys/param.h> |
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48 | #include <sys/systm.h> |
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49 | #include <sys/malloc.h> |
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50 | #include <sys/mbuf.h> |
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51 | #include <sys/domain.h> |
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52 | #include <sys/protosw.h> |
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53 | #include <sys/socket.h> |
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54 | #include <sys/socketvar.h> |
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55 | #include <sys/priv.h> |
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56 | #include <sys/proc.h> |
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57 | #include <sys/jail.h> |
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58 | #include <sys/kernel.h> |
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59 | #include <sys/sysctl.h> |
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60 | |
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61 | #ifdef DDB |
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62 | #include <ddb/ddb.h> |
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63 | #endif |
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64 | |
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65 | #include <vm/uma.h> |
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66 | |
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67 | #include <net/if.h> |
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68 | #include <net/if_types.h> |
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69 | #include <net/route.h> |
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70 | #include <net/vnet.h> |
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71 | |
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72 | #include <netinet/in.h> |
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73 | #include <netinet/in_pcb.h> |
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74 | #include <netinet/in_var.h> |
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75 | #include <netinet/ip_var.h> |
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76 | #include <netinet/tcp_var.h> |
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77 | #include <netinet/udp.h> |
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78 | #include <netinet/udp_var.h> |
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79 | #ifdef INET6 |
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80 | #include <netinet/ip6.h> |
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81 | #include <netinet6/ip6_var.h> |
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82 | #endif /* INET6 */ |
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83 | |
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84 | |
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85 | #ifdef IPSEC |
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86 | #include <netipsec/ipsec.h> |
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87 | #include <netipsec/key.h> |
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88 | #endif /* IPSEC */ |
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89 | |
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90 | #include <security/mac/mac_framework.h> |
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91 | |
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92 | /* |
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93 | * These configure the range of local port addresses assigned to |
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94 | * "unspecified" outgoing connections/packets/whatever. |
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95 | */ |
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96 | VNET_DEFINE(int, ipport_lowfirstauto) = IPPORT_RESERVED - 1; /* 1023 */ |
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97 | VNET_DEFINE(int, ipport_lowlastauto) = IPPORT_RESERVEDSTART; /* 600 */ |
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98 | VNET_DEFINE(int, ipport_firstauto) = IPPORT_EPHEMERALFIRST; /* 10000 */ |
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99 | VNET_DEFINE(int, ipport_lastauto) = IPPORT_EPHEMERALLAST; /* 65535 */ |
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100 | VNET_DEFINE(int, ipport_hifirstauto) = IPPORT_HIFIRSTAUTO; /* 49152 */ |
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101 | VNET_DEFINE(int, ipport_hilastauto) = IPPORT_HILASTAUTO; /* 65535 */ |
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102 | |
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103 | /* |
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104 | * Reserved ports accessible only to root. There are significant |
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105 | * security considerations that must be accounted for when changing these, |
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106 | * but the security benefits can be great. Please be careful. |
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107 | */ |
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108 | VNET_DEFINE(int, ipport_reservedhigh) = IPPORT_RESERVED - 1; /* 1023 */ |
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109 | VNET_DEFINE(int, ipport_reservedlow); |
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110 | |
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111 | /* Variables dealing with random ephemeral port allocation. */ |
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112 | VNET_DEFINE(int, ipport_randomized) = 1; /* user controlled via sysctl */ |
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113 | VNET_DEFINE(int, ipport_randomcps) = 10; /* user controlled via sysctl */ |
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114 | VNET_DEFINE(int, ipport_randomtime) = 45; /* user controlled via sysctl */ |
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115 | VNET_DEFINE(int, ipport_stoprandom); /* toggled by ipport_tick */ |
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116 | VNET_DEFINE(int, ipport_tcpallocs); |
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117 | static VNET_DEFINE(int, ipport_tcplastcount); |
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118 | |
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119 | #define V_ipport_tcplastcount VNET(ipport_tcplastcount) |
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120 | |
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121 | #define RANGECHK(var, min, max) \ |
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122 | if ((var) < (min)) { (var) = (min); } \ |
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123 | else if ((var) > (max)) { (var) = (max); } |
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124 | |
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125 | static void in_pcbremlists(struct inpcb *inp); |
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126 | |
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127 | static int |
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128 | sysctl_net_ipport_check(SYSCTL_HANDLER_ARGS) |
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129 | { |
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130 | int error; |
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131 | |
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132 | #ifdef VIMAGE |
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133 | error = vnet_sysctl_handle_int(oidp, arg1, arg2, req); |
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134 | #else |
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135 | error = sysctl_handle_int(oidp, arg1, arg2, req); |
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136 | #endif |
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137 | if (error == 0) { |
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138 | RANGECHK(V_ipport_lowfirstauto, 1, IPPORT_RESERVED - 1); |
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139 | RANGECHK(V_ipport_lowlastauto, 1, IPPORT_RESERVED - 1); |
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140 | RANGECHK(V_ipport_firstauto, IPPORT_RESERVED, IPPORT_MAX); |
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141 | RANGECHK(V_ipport_lastauto, IPPORT_RESERVED, IPPORT_MAX); |
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142 | RANGECHK(V_ipport_hifirstauto, IPPORT_RESERVED, IPPORT_MAX); |
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143 | RANGECHK(V_ipport_hilastauto, IPPORT_RESERVED, IPPORT_MAX); |
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144 | } |
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145 | return (error); |
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146 | } |
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147 | |
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148 | #undef RANGECHK |
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149 | |
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150 | SYSCTL_NODE(_net_inet_ip, IPPROTO_IP, portrange, CTLFLAG_RW, 0, "IP Ports"); |
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151 | |
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152 | SYSCTL_VNET_PROC(_net_inet_ip_portrange, OID_AUTO, lowfirst, |
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153 | CTLTYPE_INT|CTLFLAG_RW, &VNET_NAME(ipport_lowfirstauto), 0, |
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154 | &sysctl_net_ipport_check, "I", ""); |
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155 | SYSCTL_VNET_PROC(_net_inet_ip_portrange, OID_AUTO, lowlast, |
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156 | CTLTYPE_INT|CTLFLAG_RW, &VNET_NAME(ipport_lowlastauto), 0, |
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157 | &sysctl_net_ipport_check, "I", ""); |
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158 | SYSCTL_VNET_PROC(_net_inet_ip_portrange, OID_AUTO, first, |
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159 | CTLTYPE_INT|CTLFLAG_RW, &VNET_NAME(ipport_firstauto), 0, |
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160 | &sysctl_net_ipport_check, "I", ""); |
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161 | SYSCTL_VNET_PROC(_net_inet_ip_portrange, OID_AUTO, last, |
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162 | CTLTYPE_INT|CTLFLAG_RW, &VNET_NAME(ipport_lastauto), 0, |
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163 | &sysctl_net_ipport_check, "I", ""); |
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164 | SYSCTL_VNET_PROC(_net_inet_ip_portrange, OID_AUTO, hifirst, |
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165 | CTLTYPE_INT|CTLFLAG_RW, &VNET_NAME(ipport_hifirstauto), 0, |
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166 | &sysctl_net_ipport_check, "I", ""); |
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167 | SYSCTL_VNET_PROC(_net_inet_ip_portrange, OID_AUTO, hilast, |
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168 | CTLTYPE_INT|CTLFLAG_RW, &VNET_NAME(ipport_hilastauto), 0, |
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169 | &sysctl_net_ipport_check, "I", ""); |
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170 | SYSCTL_VNET_INT(_net_inet_ip_portrange, OID_AUTO, reservedhigh, |
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171 | CTLFLAG_RW|CTLFLAG_SECURE, &VNET_NAME(ipport_reservedhigh), 0, ""); |
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172 | SYSCTL_VNET_INT(_net_inet_ip_portrange, OID_AUTO, reservedlow, |
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173 | CTLFLAG_RW|CTLFLAG_SECURE, &VNET_NAME(ipport_reservedlow), 0, ""); |
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174 | SYSCTL_VNET_INT(_net_inet_ip_portrange, OID_AUTO, randomized, CTLFLAG_RW, |
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175 | &VNET_NAME(ipport_randomized), 0, "Enable random port allocation"); |
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176 | SYSCTL_VNET_INT(_net_inet_ip_portrange, OID_AUTO, randomcps, CTLFLAG_RW, |
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177 | &VNET_NAME(ipport_randomcps), 0, "Maximum number of random port " |
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178 | "allocations before switching to a sequental one"); |
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179 | SYSCTL_VNET_INT(_net_inet_ip_portrange, OID_AUTO, randomtime, CTLFLAG_RW, |
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180 | &VNET_NAME(ipport_randomtime), 0, |
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181 | "Minimum time to keep sequental port " |
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182 | "allocation before switching to a random one"); |
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183 | |
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184 | /* |
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185 | * in_pcb.c: manage the Protocol Control Blocks. |
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186 | * |
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187 | * NOTE: It is assumed that most of these functions will be called with |
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188 | * the pcbinfo lock held, and often, the inpcb lock held, as these utility |
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189 | * functions often modify hash chains or addresses in pcbs. |
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190 | */ |
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191 | |
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192 | /* |
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193 | * Allocate a PCB and associate it with the socket. |
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194 | * On success return with the PCB locked. |
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195 | */ |
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196 | int |
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197 | in_pcballoc(struct socket *so, struct inpcbinfo *pcbinfo) |
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198 | { |
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199 | struct inpcb *inp; |
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200 | int error; |
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201 | |
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202 | INP_INFO_WLOCK_ASSERT(pcbinfo); |
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203 | error = 0; |
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204 | inp = uma_zalloc(pcbinfo->ipi_zone, M_NOWAIT); |
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205 | if (inp == NULL) |
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206 | return (ENOBUFS); |
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207 | bzero(inp, inp_zero_size); |
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208 | inp->inp_pcbinfo = pcbinfo; |
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209 | inp->inp_socket = so; |
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210 | inp->inp_cred = crhold(so->so_cred); |
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211 | inp->inp_inc.inc_fibnum = so->so_fibnum; |
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212 | #ifdef MAC |
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213 | error = mac_inpcb_init(inp, M_NOWAIT); |
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214 | if (error != 0) |
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215 | goto out; |
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216 | mac_inpcb_create(so, inp); |
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217 | #endif |
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218 | #ifdef IPSEC |
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219 | error = ipsec_init_policy(so, &inp->inp_sp); |
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220 | if (error != 0) { |
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221 | #ifdef MAC |
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222 | mac_inpcb_destroy(inp); |
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223 | #endif |
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224 | goto out; |
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225 | } |
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226 | #endif /*IPSEC*/ |
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227 | #ifdef INET6 |
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228 | if (INP_SOCKAF(so) == AF_INET6) { |
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229 | inp->inp_vflag |= INP_IPV6PROTO; |
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230 | if (V_ip6_v6only) |
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231 | inp->inp_flags |= IN6P_IPV6_V6ONLY; |
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232 | } |
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233 | #endif |
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234 | LIST_INSERT_HEAD(pcbinfo->ipi_listhead, inp, inp_list); |
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235 | pcbinfo->ipi_count++; |
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236 | so->so_pcb = (caddr_t)inp; |
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237 | #ifdef INET6 |
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238 | if (V_ip6_auto_flowlabel) |
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239 | inp->inp_flags |= IN6P_AUTOFLOWLABEL; |
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240 | #endif |
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241 | INP_WLOCK(inp); |
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242 | inp->inp_gencnt = ++pcbinfo->ipi_gencnt; |
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243 | inp->inp_refcount = 1; /* Reference from the inpcbinfo */ |
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244 | #if defined(IPSEC) || defined(MAC) |
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245 | out: |
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246 | if (error != 0) { |
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247 | crfree(inp->inp_cred); |
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248 | uma_zfree(pcbinfo->ipi_zone, inp); |
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249 | } |
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250 | #endif |
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251 | return (error); |
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252 | } |
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253 | |
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254 | int |
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255 | in_pcbbind(struct inpcb *inp, struct sockaddr *nam, struct ucred *cred) |
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256 | { |
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257 | int anonport, error; |
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258 | |
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259 | INP_INFO_WLOCK_ASSERT(inp->inp_pcbinfo); |
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260 | INP_WLOCK_ASSERT(inp); |
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261 | |
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262 | if (inp->inp_lport != 0 || inp->inp_laddr.s_addr != INADDR_ANY) |
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263 | return (EINVAL); |
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264 | anonport = inp->inp_lport == 0 && (nam == NULL || |
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265 | ((struct sockaddr_in *)nam)->sin_port == 0); |
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266 | error = in_pcbbind_setup(inp, nam, &inp->inp_laddr.s_addr, |
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267 | &inp->inp_lport, cred); |
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268 | if (error) |
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269 | return (error); |
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270 | if (in_pcbinshash(inp) != 0) { |
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271 | inp->inp_laddr.s_addr = INADDR_ANY; |
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272 | inp->inp_lport = 0; |
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273 | return (EAGAIN); |
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274 | } |
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275 | if (anonport) |
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276 | inp->inp_flags |= INP_ANONPORT; |
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277 | return (0); |
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278 | } |
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279 | |
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280 | /* |
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281 | * Set up a bind operation on a PCB, performing port allocation |
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282 | * as required, but do not actually modify the PCB. Callers can |
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283 | * either complete the bind by setting inp_laddr/inp_lport and |
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284 | * calling in_pcbinshash(), or they can just use the resulting |
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285 | * port and address to authorise the sending of a once-off packet. |
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286 | * |
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287 | * On error, the values of *laddrp and *lportp are not changed. |
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288 | */ |
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289 | int |
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290 | in_pcbbind_setup(struct inpcb *inp, struct sockaddr *nam, in_addr_t *laddrp, |
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291 | u_short *lportp, struct ucred *cred) |
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292 | { |
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293 | struct socket *so = inp->inp_socket; |
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294 | unsigned short *lastport; |
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295 | struct sockaddr_in *sin; |
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296 | struct inpcbinfo *pcbinfo = inp->inp_pcbinfo; |
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297 | struct in_addr laddr; |
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298 | u_short lport = 0; |
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299 | int wild = 0, reuseport = (so->so_options & SO_REUSEPORT); |
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300 | int error; |
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301 | int dorandom; |
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302 | |
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303 | /* |
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304 | * Because no actual state changes occur here, a global write lock on |
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305 | * the pcbinfo isn't required. |
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306 | */ |
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307 | INP_INFO_LOCK_ASSERT(pcbinfo); |
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308 | INP_LOCK_ASSERT(inp); |
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309 | |
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310 | if (TAILQ_EMPTY(&V_in_ifaddrhead)) /* XXX broken! */ |
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311 | return (EADDRNOTAVAIL); |
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312 | laddr.s_addr = *laddrp; |
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313 | if (nam != NULL && laddr.s_addr != INADDR_ANY) |
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314 | return (EINVAL); |
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315 | if ((so->so_options & (SO_REUSEADDR|SO_REUSEPORT)) == 0) |
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316 | wild = INPLOOKUP_WILDCARD; |
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317 | if (nam == NULL) { |
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318 | if ((error = prison_local_ip4(cred, &laddr)) != 0) |
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319 | return (error); |
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320 | } else { |
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321 | sin = (struct sockaddr_in *)nam; |
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322 | if (nam->sa_len != sizeof (*sin)) |
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323 | return (EINVAL); |
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324 | #ifdef notdef |
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325 | /* |
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326 | * We should check the family, but old programs |
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327 | * incorrectly fail to initialize it. |
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328 | */ |
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329 | if (sin->sin_family != AF_INET) |
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330 | return (EAFNOSUPPORT); |
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331 | #endif |
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332 | error = prison_local_ip4(cred, &sin->sin_addr); |
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333 | if (error) |
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334 | return (error); |
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335 | if (sin->sin_port != *lportp) { |
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336 | /* Don't allow the port to change. */ |
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337 | if (*lportp != 0) |
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338 | return (EINVAL); |
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339 | lport = sin->sin_port; |
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340 | } |
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341 | /* NB: lport is left as 0 if the port isn't being changed. */ |
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342 | if (IN_MULTICAST(ntohl(sin->sin_addr.s_addr))) { |
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343 | /* |
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344 | * Treat SO_REUSEADDR as SO_REUSEPORT for multicast; |
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345 | * allow complete duplication of binding if |
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346 | * SO_REUSEPORT is set, or if SO_REUSEADDR is set |
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347 | * and a multicast address is bound on both |
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348 | * new and duplicated sockets. |
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349 | */ |
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350 | if (so->so_options & SO_REUSEADDR) |
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351 | reuseport = SO_REUSEADDR|SO_REUSEPORT; |
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352 | } else if (sin->sin_addr.s_addr != INADDR_ANY) { |
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353 | sin->sin_port = 0; /* yech... */ |
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354 | bzero(&sin->sin_zero, sizeof(sin->sin_zero)); |
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355 | /* |
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356 | * Is the address a local IP address? |
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357 | * If INP_BINDANY is set, then the socket may be bound |
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358 | * to any endpoint address, local or not. |
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359 | */ |
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360 | if ((inp->inp_flags & INP_BINDANY) == 0 && |
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361 | ifa_ifwithaddr_check((struct sockaddr *)sin) == 0) |
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362 | return (EADDRNOTAVAIL); |
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363 | } |
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364 | laddr = sin->sin_addr; |
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365 | if (lport) { |
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366 | struct inpcb *t; |
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367 | struct tcptw *tw; |
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368 | |
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369 | /* GROSS */ |
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370 | if (ntohs(lport) <= V_ipport_reservedhigh && |
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371 | ntohs(lport) >= V_ipport_reservedlow && |
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372 | priv_check_cred(cred, PRIV_NETINET_RESERVEDPORT, |
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373 | 0)) |
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374 | return (EACCES); |
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375 | if (!IN_MULTICAST(ntohl(sin->sin_addr.s_addr)) && |
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376 | priv_check_cred(inp->inp_cred, |
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377 | PRIV_NETINET_REUSEPORT, 0) != 0) { |
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378 | t = in_pcblookup_local(pcbinfo, sin->sin_addr, |
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379 | lport, INPLOOKUP_WILDCARD, cred); |
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380 | /* |
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381 | * XXX |
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382 | * This entire block sorely needs a rewrite. |
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383 | */ |
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384 | if (t && |
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385 | ((t->inp_flags & INP_TIMEWAIT) == 0) && |
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386 | (so->so_type != SOCK_STREAM || |
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387 | ntohl(t->inp_faddr.s_addr) == INADDR_ANY) && |
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388 | (ntohl(sin->sin_addr.s_addr) != INADDR_ANY || |
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389 | ntohl(t->inp_laddr.s_addr) != INADDR_ANY || |
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390 | (t->inp_socket->so_options & |
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391 | SO_REUSEPORT) == 0) && |
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392 | #ifndef __rtems__ |
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393 | (inp->inp_cred->cr_uid != |
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394 | t->inp_cred->cr_uid)) |
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395 | #else /* __rtems__ */ |
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396 | 0) |
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397 | #endif /* __rtems__ */ |
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398 | return (EADDRINUSE); |
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399 | } |
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400 | t = in_pcblookup_local(pcbinfo, sin->sin_addr, |
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401 | lport, wild, cred); |
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402 | if (t && (t->inp_flags & INP_TIMEWAIT)) { |
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403 | /* |
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404 | * XXXRW: If an incpb has had its timewait |
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405 | * state recycled, we treat the address as |
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406 | * being in use (for now). This is better |
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407 | * than a panic, but not desirable. |
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408 | */ |
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409 | tw = intotw(inp); |
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410 | if (tw == NULL || |
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411 | (reuseport & tw->tw_so_options) == 0) |
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412 | return (EADDRINUSE); |
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413 | } else if (t && |
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414 | (reuseport & t->inp_socket->so_options) == 0) { |
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415 | #ifdef INET6 |
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416 | if (ntohl(sin->sin_addr.s_addr) != |
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417 | INADDR_ANY || |
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418 | ntohl(t->inp_laddr.s_addr) != |
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419 | INADDR_ANY || |
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420 | INP_SOCKAF(so) == |
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421 | INP_SOCKAF(t->inp_socket)) |
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422 | #endif |
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423 | return (EADDRINUSE); |
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424 | } |
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425 | } |
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426 | } |
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427 | if (*lportp != 0) |
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428 | lport = *lportp; |
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429 | if (lport == 0) { |
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430 | u_short first, last, aux; |
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431 | int count; |
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432 | |
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433 | if (inp->inp_flags & INP_HIGHPORT) { |
---|
434 | first = V_ipport_hifirstauto; /* sysctl */ |
---|
435 | last = V_ipport_hilastauto; |
---|
436 | lastport = &pcbinfo->ipi_lasthi; |
---|
437 | } else if (inp->inp_flags & INP_LOWPORT) { |
---|
438 | error = priv_check_cred(cred, |
---|
439 | PRIV_NETINET_RESERVEDPORT, 0); |
---|
440 | if (error) |
---|
441 | return error; |
---|
442 | first = V_ipport_lowfirstauto; /* 1023 */ |
---|
443 | last = V_ipport_lowlastauto; /* 600 */ |
---|
444 | lastport = &pcbinfo->ipi_lastlow; |
---|
445 | } else { |
---|
446 | first = V_ipport_firstauto; /* sysctl */ |
---|
447 | last = V_ipport_lastauto; |
---|
448 | lastport = &pcbinfo->ipi_lastport; |
---|
449 | } |
---|
450 | /* |
---|
451 | * For UDP, use random port allocation as long as the user |
---|
452 | * allows it. For TCP (and as of yet unknown) connections, |
---|
453 | * use random port allocation only if the user allows it AND |
---|
454 | * ipport_tick() allows it. |
---|
455 | */ |
---|
456 | if (V_ipport_randomized && |
---|
457 | (!V_ipport_stoprandom || pcbinfo == &V_udbinfo)) |
---|
458 | dorandom = 1; |
---|
459 | else |
---|
460 | dorandom = 0; |
---|
461 | /* |
---|
462 | * It makes no sense to do random port allocation if |
---|
463 | * we have the only port available. |
---|
464 | */ |
---|
465 | if (first == last) |
---|
466 | dorandom = 0; |
---|
467 | /* Make sure to not include UDP packets in the count. */ |
---|
468 | if (pcbinfo != &V_udbinfo) |
---|
469 | V_ipport_tcpallocs++; |
---|
470 | /* |
---|
471 | * Instead of having two loops further down counting up or down |
---|
472 | * make sure that first is always <= last and go with only one |
---|
473 | * code path implementing all logic. |
---|
474 | */ |
---|
475 | if (first > last) { |
---|
476 | aux = first; |
---|
477 | first = last; |
---|
478 | last = aux; |
---|
479 | } |
---|
480 | |
---|
481 | if (dorandom) |
---|
482 | *lastport = first + |
---|
483 | (arc4random() % (last - first)); |
---|
484 | |
---|
485 | count = last - first; |
---|
486 | |
---|
487 | do { |
---|
488 | if (count-- < 0) /* completely used? */ |
---|
489 | return (EADDRNOTAVAIL); |
---|
490 | ++*lastport; |
---|
491 | if (*lastport < first || *lastport > last) |
---|
492 | *lastport = first; |
---|
493 | lport = htons(*lastport); |
---|
494 | } while (in_pcblookup_local(pcbinfo, laddr, |
---|
495 | lport, wild, cred)); |
---|
496 | } |
---|
497 | *laddrp = laddr.s_addr; |
---|
498 | *lportp = lport; |
---|
499 | return (0); |
---|
500 | } |
---|
501 | |
---|
502 | /* |
---|
503 | * Connect from a socket to a specified address. |
---|
504 | * Both address and port must be specified in argument sin. |
---|
505 | * If don't have a local address for this socket yet, |
---|
506 | * then pick one. |
---|
507 | */ |
---|
508 | int |
---|
509 | in_pcbconnect(struct inpcb *inp, struct sockaddr *nam, struct ucred *cred) |
---|
510 | { |
---|
511 | u_short lport, fport; |
---|
512 | in_addr_t laddr, faddr; |
---|
513 | int anonport, error; |
---|
514 | |
---|
515 | INP_INFO_WLOCK_ASSERT(inp->inp_pcbinfo); |
---|
516 | INP_WLOCK_ASSERT(inp); |
---|
517 | |
---|
518 | lport = inp->inp_lport; |
---|
519 | laddr = inp->inp_laddr.s_addr; |
---|
520 | anonport = (lport == 0); |
---|
521 | error = in_pcbconnect_setup(inp, nam, &laddr, &lport, &faddr, &fport, |
---|
522 | NULL, cred); |
---|
523 | if (error) |
---|
524 | return (error); |
---|
525 | |
---|
526 | /* Do the initial binding of the local address if required. */ |
---|
527 | if (inp->inp_laddr.s_addr == INADDR_ANY && inp->inp_lport == 0) { |
---|
528 | inp->inp_lport = lport; |
---|
529 | inp->inp_laddr.s_addr = laddr; |
---|
530 | if (in_pcbinshash(inp) != 0) { |
---|
531 | inp->inp_laddr.s_addr = INADDR_ANY; |
---|
532 | inp->inp_lport = 0; |
---|
533 | return (EAGAIN); |
---|
534 | } |
---|
535 | } |
---|
536 | |
---|
537 | /* Commit the remaining changes. */ |
---|
538 | inp->inp_lport = lport; |
---|
539 | inp->inp_laddr.s_addr = laddr; |
---|
540 | inp->inp_faddr.s_addr = faddr; |
---|
541 | inp->inp_fport = fport; |
---|
542 | in_pcbrehash(inp); |
---|
543 | |
---|
544 | if (anonport) |
---|
545 | inp->inp_flags |= INP_ANONPORT; |
---|
546 | return (0); |
---|
547 | } |
---|
548 | |
---|
549 | /* |
---|
550 | * Do proper source address selection on an unbound socket in case |
---|
551 | * of connect. Take jails into account as well. |
---|
552 | */ |
---|
553 | static int |
---|
554 | in_pcbladdr(struct inpcb *inp, struct in_addr *faddr, struct in_addr *laddr, |
---|
555 | struct ucred *cred) |
---|
556 | { |
---|
557 | struct ifaddr *ifa; |
---|
558 | struct sockaddr *sa; |
---|
559 | struct sockaddr_in *sin; |
---|
560 | struct route sro; |
---|
561 | int error; |
---|
562 | |
---|
563 | KASSERT(laddr != NULL, ("%s: laddr NULL", __func__)); |
---|
564 | |
---|
565 | /* |
---|
566 | * Bypass source address selection and use the primary jail IP |
---|
567 | * if requested. |
---|
568 | */ |
---|
569 | if (cred != NULL && !prison_saddrsel_ip4(cred, laddr)) |
---|
570 | return (0); |
---|
571 | |
---|
572 | error = 0; |
---|
573 | bzero(&sro, sizeof(sro)); |
---|
574 | |
---|
575 | sin = (struct sockaddr_in *)&sro.ro_dst; |
---|
576 | sin->sin_family = AF_INET; |
---|
577 | sin->sin_len = sizeof(struct sockaddr_in); |
---|
578 | sin->sin_addr.s_addr = faddr->s_addr; |
---|
579 | |
---|
580 | /* |
---|
581 | * If route is known our src addr is taken from the i/f, |
---|
582 | * else punt. |
---|
583 | * |
---|
584 | * Find out route to destination. |
---|
585 | */ |
---|
586 | if ((inp->inp_socket->so_options & SO_DONTROUTE) == 0) |
---|
587 | in_rtalloc_ign(&sro, 0, inp->inp_inc.inc_fibnum); |
---|
588 | |
---|
589 | /* |
---|
590 | * If we found a route, use the address corresponding to |
---|
591 | * the outgoing interface. |
---|
592 | * |
---|
593 | * Otherwise assume faddr is reachable on a directly connected |
---|
594 | * network and try to find a corresponding interface to take |
---|
595 | * the source address from. |
---|
596 | */ |
---|
597 | if (sro.ro_rt == NULL || sro.ro_rt->rt_ifp == NULL) { |
---|
598 | struct in_ifaddr *ia; |
---|
599 | struct ifnet *ifp; |
---|
600 | |
---|
601 | ia = ifatoia(ifa_ifwithdstaddr((struct sockaddr *)sin)); |
---|
602 | if (ia == NULL) |
---|
603 | ia = ifatoia(ifa_ifwithnet((struct sockaddr *)sin, 0)); |
---|
604 | if (ia == NULL) { |
---|
605 | error = ENETUNREACH; |
---|
606 | goto done; |
---|
607 | } |
---|
608 | |
---|
609 | if (cred == NULL || !prison_flag(cred, PR_IP4)) { |
---|
610 | laddr->s_addr = ia->ia_addr.sin_addr.s_addr; |
---|
611 | ifa_free(&ia->ia_ifa); |
---|
612 | goto done; |
---|
613 | } |
---|
614 | |
---|
615 | ifp = ia->ia_ifp; |
---|
616 | ifa_free(&ia->ia_ifa); |
---|
617 | ia = NULL; |
---|
618 | IF_ADDR_LOCK(ifp); |
---|
619 | TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { |
---|
620 | |
---|
621 | sa = ifa->ifa_addr; |
---|
622 | if (sa->sa_family != AF_INET) |
---|
623 | continue; |
---|
624 | sin = (struct sockaddr_in *)sa; |
---|
625 | if (prison_check_ip4(cred, &sin->sin_addr) == 0) { |
---|
626 | ia = (struct in_ifaddr *)ifa; |
---|
627 | break; |
---|
628 | } |
---|
629 | } |
---|
630 | if (ia != NULL) { |
---|
631 | laddr->s_addr = ia->ia_addr.sin_addr.s_addr; |
---|
632 | IF_ADDR_UNLOCK(ifp); |
---|
633 | goto done; |
---|
634 | } |
---|
635 | IF_ADDR_UNLOCK(ifp); |
---|
636 | |
---|
637 | /* 3. As a last resort return the 'default' jail address. */ |
---|
638 | error = prison_get_ip4(cred, laddr); |
---|
639 | goto done; |
---|
640 | } |
---|
641 | |
---|
642 | /* |
---|
643 | * If the outgoing interface on the route found is not |
---|
644 | * a loopback interface, use the address from that interface. |
---|
645 | * In case of jails do those three steps: |
---|
646 | * 1. check if the interface address belongs to the jail. If so use it. |
---|
647 | * 2. check if we have any address on the outgoing interface |
---|
648 | * belonging to this jail. If so use it. |
---|
649 | * 3. as a last resort return the 'default' jail address. |
---|
650 | */ |
---|
651 | if ((sro.ro_rt->rt_ifp->if_flags & IFF_LOOPBACK) == 0) { |
---|
652 | struct in_ifaddr *ia; |
---|
653 | struct ifnet *ifp; |
---|
654 | |
---|
655 | /* If not jailed, use the default returned. */ |
---|
656 | if (cred == NULL || !prison_flag(cred, PR_IP4)) { |
---|
657 | ia = (struct in_ifaddr *)sro.ro_rt->rt_ifa; |
---|
658 | laddr->s_addr = ia->ia_addr.sin_addr.s_addr; |
---|
659 | goto done; |
---|
660 | } |
---|
661 | |
---|
662 | /* Jailed. */ |
---|
663 | /* 1. Check if the iface address belongs to the jail. */ |
---|
664 | sin = (struct sockaddr_in *)sro.ro_rt->rt_ifa->ifa_addr; |
---|
665 | if (prison_check_ip4(cred, &sin->sin_addr) == 0) { |
---|
666 | ia = (struct in_ifaddr *)sro.ro_rt->rt_ifa; |
---|
667 | laddr->s_addr = ia->ia_addr.sin_addr.s_addr; |
---|
668 | goto done; |
---|
669 | } |
---|
670 | |
---|
671 | /* |
---|
672 | * 2. Check if we have any address on the outgoing interface |
---|
673 | * belonging to this jail. |
---|
674 | */ |
---|
675 | ia = NULL; |
---|
676 | ifp = sro.ro_rt->rt_ifp; |
---|
677 | IF_ADDR_LOCK(ifp); |
---|
678 | TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { |
---|
679 | sa = ifa->ifa_addr; |
---|
680 | if (sa->sa_family != AF_INET) |
---|
681 | continue; |
---|
682 | sin = (struct sockaddr_in *)sa; |
---|
683 | if (prison_check_ip4(cred, &sin->sin_addr) == 0) { |
---|
684 | ia = (struct in_ifaddr *)ifa; |
---|
685 | break; |
---|
686 | } |
---|
687 | } |
---|
688 | if (ia != NULL) { |
---|
689 | laddr->s_addr = ia->ia_addr.sin_addr.s_addr; |
---|
690 | IF_ADDR_UNLOCK(ifp); |
---|
691 | goto done; |
---|
692 | } |
---|
693 | IF_ADDR_UNLOCK(ifp); |
---|
694 | |
---|
695 | /* 3. As a last resort return the 'default' jail address. */ |
---|
696 | error = prison_get_ip4(cred, laddr); |
---|
697 | goto done; |
---|
698 | } |
---|
699 | |
---|
700 | /* |
---|
701 | * The outgoing interface is marked with 'loopback net', so a route |
---|
702 | * to ourselves is here. |
---|
703 | * Try to find the interface of the destination address and then |
---|
704 | * take the address from there. That interface is not necessarily |
---|
705 | * a loopback interface. |
---|
706 | * In case of jails, check that it is an address of the jail |
---|
707 | * and if we cannot find, fall back to the 'default' jail address. |
---|
708 | */ |
---|
709 | if ((sro.ro_rt->rt_ifp->if_flags & IFF_LOOPBACK) != 0) { |
---|
710 | struct sockaddr_in sain; |
---|
711 | struct in_ifaddr *ia; |
---|
712 | |
---|
713 | bzero(&sain, sizeof(struct sockaddr_in)); |
---|
714 | sain.sin_family = AF_INET; |
---|
715 | sain.sin_len = sizeof(struct sockaddr_in); |
---|
716 | sain.sin_addr.s_addr = faddr->s_addr; |
---|
717 | |
---|
718 | ia = ifatoia(ifa_ifwithdstaddr(sintosa(&sain))); |
---|
719 | if (ia == NULL) |
---|
720 | ia = ifatoia(ifa_ifwithnet(sintosa(&sain), 0)); |
---|
721 | if (ia == NULL) |
---|
722 | ia = ifatoia(ifa_ifwithaddr(sintosa(&sain))); |
---|
723 | |
---|
724 | if (cred == NULL || !prison_flag(cred, PR_IP4)) { |
---|
725 | if (ia == NULL) { |
---|
726 | error = ENETUNREACH; |
---|
727 | goto done; |
---|
728 | } |
---|
729 | laddr->s_addr = ia->ia_addr.sin_addr.s_addr; |
---|
730 | ifa_free(&ia->ia_ifa); |
---|
731 | goto done; |
---|
732 | } |
---|
733 | |
---|
734 | /* Jailed. */ |
---|
735 | if (ia != NULL) { |
---|
736 | struct ifnet *ifp; |
---|
737 | |
---|
738 | ifp = ia->ia_ifp; |
---|
739 | ifa_free(&ia->ia_ifa); |
---|
740 | ia = NULL; |
---|
741 | IF_ADDR_LOCK(ifp); |
---|
742 | TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { |
---|
743 | |
---|
744 | sa = ifa->ifa_addr; |
---|
745 | if (sa->sa_family != AF_INET) |
---|
746 | continue; |
---|
747 | sin = (struct sockaddr_in *)sa; |
---|
748 | if (prison_check_ip4(cred, |
---|
749 | &sin->sin_addr) == 0) { |
---|
750 | ia = (struct in_ifaddr *)ifa; |
---|
751 | break; |
---|
752 | } |
---|
753 | } |
---|
754 | if (ia != NULL) { |
---|
755 | laddr->s_addr = ia->ia_addr.sin_addr.s_addr; |
---|
756 | IF_ADDR_UNLOCK(ifp); |
---|
757 | goto done; |
---|
758 | } |
---|
759 | IF_ADDR_UNLOCK(ifp); |
---|
760 | } |
---|
761 | |
---|
762 | /* 3. As a last resort return the 'default' jail address. */ |
---|
763 | error = prison_get_ip4(cred, laddr); |
---|
764 | goto done; |
---|
765 | } |
---|
766 | |
---|
767 | done: |
---|
768 | if (sro.ro_rt != NULL) |
---|
769 | RTFREE(sro.ro_rt); |
---|
770 | return (error); |
---|
771 | } |
---|
772 | |
---|
773 | /* |
---|
774 | * Set up for a connect from a socket to the specified address. |
---|
775 | * On entry, *laddrp and *lportp should contain the current local |
---|
776 | * address and port for the PCB; these are updated to the values |
---|
777 | * that should be placed in inp_laddr and inp_lport to complete |
---|
778 | * the connect. |
---|
779 | * |
---|
780 | * On success, *faddrp and *fportp will be set to the remote address |
---|
781 | * and port. These are not updated in the error case. |
---|
782 | * |
---|
783 | * If the operation fails because the connection already exists, |
---|
784 | * *oinpp will be set to the PCB of that connection so that the |
---|
785 | * caller can decide to override it. In all other cases, *oinpp |
---|
786 | * is set to NULL. |
---|
787 | */ |
---|
788 | int |
---|
789 | in_pcbconnect_setup(struct inpcb *inp, struct sockaddr *nam, |
---|
790 | in_addr_t *laddrp, u_short *lportp, in_addr_t *faddrp, u_short *fportp, |
---|
791 | struct inpcb **oinpp, struct ucred *cred) |
---|
792 | { |
---|
793 | struct sockaddr_in *sin = (struct sockaddr_in *)nam; |
---|
794 | struct in_ifaddr *ia; |
---|
795 | struct inpcb *oinp; |
---|
796 | struct in_addr laddr, faddr; |
---|
797 | u_short lport, fport; |
---|
798 | int error; |
---|
799 | |
---|
800 | /* |
---|
801 | * Because a global state change doesn't actually occur here, a read |
---|
802 | * lock is sufficient. |
---|
803 | */ |
---|
804 | INP_INFO_LOCK_ASSERT(inp->inp_pcbinfo); |
---|
805 | INP_LOCK_ASSERT(inp); |
---|
806 | |
---|
807 | if (oinpp != NULL) |
---|
808 | *oinpp = NULL; |
---|
809 | if (nam->sa_len != sizeof (*sin)) |
---|
810 | return (EINVAL); |
---|
811 | if (sin->sin_family != AF_INET) |
---|
812 | return (EAFNOSUPPORT); |
---|
813 | if (sin->sin_port == 0) |
---|
814 | return (EADDRNOTAVAIL); |
---|
815 | laddr.s_addr = *laddrp; |
---|
816 | lport = *lportp; |
---|
817 | faddr = sin->sin_addr; |
---|
818 | fport = sin->sin_port; |
---|
819 | |
---|
820 | if (!TAILQ_EMPTY(&V_in_ifaddrhead)) { |
---|
821 | /* |
---|
822 | * If the destination address is INADDR_ANY, |
---|
823 | * use the primary local address. |
---|
824 | * If the supplied address is INADDR_BROADCAST, |
---|
825 | * and the primary interface supports broadcast, |
---|
826 | * choose the broadcast address for that interface. |
---|
827 | */ |
---|
828 | if (faddr.s_addr == INADDR_ANY) { |
---|
829 | IN_IFADDR_RLOCK(); |
---|
830 | faddr = |
---|
831 | IA_SIN(TAILQ_FIRST(&V_in_ifaddrhead))->sin_addr; |
---|
832 | IN_IFADDR_RUNLOCK(); |
---|
833 | if (cred != NULL && |
---|
834 | (error = prison_get_ip4(cred, &faddr)) != 0) |
---|
835 | return (error); |
---|
836 | } else if (faddr.s_addr == (u_long)INADDR_BROADCAST) { |
---|
837 | IN_IFADDR_RLOCK(); |
---|
838 | if (TAILQ_FIRST(&V_in_ifaddrhead)->ia_ifp->if_flags & |
---|
839 | IFF_BROADCAST) |
---|
840 | faddr = satosin(&TAILQ_FIRST( |
---|
841 | &V_in_ifaddrhead)->ia_broadaddr)->sin_addr; |
---|
842 | IN_IFADDR_RUNLOCK(); |
---|
843 | } |
---|
844 | } |
---|
845 | if (laddr.s_addr == INADDR_ANY) { |
---|
846 | error = in_pcbladdr(inp, &faddr, &laddr, cred); |
---|
847 | /* |
---|
848 | * If the destination address is multicast and an outgoing |
---|
849 | * interface has been set as a multicast option, prefer the |
---|
850 | * address of that interface as our source address. |
---|
851 | */ |
---|
852 | if (IN_MULTICAST(ntohl(faddr.s_addr)) && |
---|
853 | inp->inp_moptions != NULL) { |
---|
854 | struct ip_moptions *imo; |
---|
855 | struct ifnet *ifp; |
---|
856 | |
---|
857 | imo = inp->inp_moptions; |
---|
858 | if (imo->imo_multicast_ifp != NULL) { |
---|
859 | ifp = imo->imo_multicast_ifp; |
---|
860 | IN_IFADDR_RLOCK(); |
---|
861 | TAILQ_FOREACH(ia, &V_in_ifaddrhead, ia_link) |
---|
862 | if (ia->ia_ifp == ifp) |
---|
863 | break; |
---|
864 | if (ia == NULL) { |
---|
865 | IN_IFADDR_RUNLOCK(); |
---|
866 | error = EADDRNOTAVAIL; |
---|
867 | } else { |
---|
868 | laddr = ia->ia_addr.sin_addr; |
---|
869 | IN_IFADDR_RUNLOCK(); |
---|
870 | error = 0; |
---|
871 | } |
---|
872 | } |
---|
873 | } |
---|
874 | if (error) |
---|
875 | return (error); |
---|
876 | } |
---|
877 | oinp = in_pcblookup_hash(inp->inp_pcbinfo, faddr, fport, laddr, lport, |
---|
878 | 0, NULL); |
---|
879 | if (oinp != NULL) { |
---|
880 | if (oinpp != NULL) |
---|
881 | *oinpp = oinp; |
---|
882 | return (EADDRINUSE); |
---|
883 | } |
---|
884 | if (lport == 0) { |
---|
885 | error = in_pcbbind_setup(inp, NULL, &laddr.s_addr, &lport, |
---|
886 | cred); |
---|
887 | if (error) |
---|
888 | return (error); |
---|
889 | } |
---|
890 | *laddrp = laddr.s_addr; |
---|
891 | *lportp = lport; |
---|
892 | *faddrp = faddr.s_addr; |
---|
893 | *fportp = fport; |
---|
894 | return (0); |
---|
895 | } |
---|
896 | |
---|
897 | void |
---|
898 | in_pcbdisconnect(struct inpcb *inp) |
---|
899 | { |
---|
900 | |
---|
901 | INP_INFO_WLOCK_ASSERT(inp->inp_pcbinfo); |
---|
902 | INP_WLOCK_ASSERT(inp); |
---|
903 | |
---|
904 | inp->inp_faddr.s_addr = INADDR_ANY; |
---|
905 | inp->inp_fport = 0; |
---|
906 | in_pcbrehash(inp); |
---|
907 | } |
---|
908 | |
---|
909 | /* |
---|
910 | * in_pcbdetach() is responsibe for disassociating a socket from an inpcb. |
---|
911 | * For most protocols, this will be invoked immediately prior to calling |
---|
912 | * in_pcbfree(). However, with TCP the inpcb may significantly outlive the |
---|
913 | * socket, in which case in_pcbfree() is deferred. |
---|
914 | */ |
---|
915 | void |
---|
916 | in_pcbdetach(struct inpcb *inp) |
---|
917 | { |
---|
918 | |
---|
919 | KASSERT(inp->inp_socket != NULL, ("%s: inp_socket == NULL", __func__)); |
---|
920 | |
---|
921 | inp->inp_socket->so_pcb = NULL; |
---|
922 | inp->inp_socket = NULL; |
---|
923 | } |
---|
924 | |
---|
925 | /* |
---|
926 | * in_pcbfree_internal() frees an inpcb that has been detached from its |
---|
927 | * socket, and whose reference count has reached 0. It will also remove the |
---|
928 | * inpcb from any global lists it might remain on. |
---|
929 | */ |
---|
930 | static void |
---|
931 | in_pcbfree_internal(struct inpcb *inp) |
---|
932 | { |
---|
933 | struct inpcbinfo *ipi = inp->inp_pcbinfo; |
---|
934 | |
---|
935 | KASSERT(inp->inp_socket == NULL, ("%s: inp_socket != NULL", __func__)); |
---|
936 | KASSERT(inp->inp_refcount == 0, ("%s: refcount !0", __func__)); |
---|
937 | |
---|
938 | INP_INFO_WLOCK_ASSERT(ipi); |
---|
939 | INP_WLOCK_ASSERT(inp); |
---|
940 | |
---|
941 | #ifdef IPSEC |
---|
942 | if (inp->inp_sp != NULL) |
---|
943 | ipsec_delete_pcbpolicy(inp); |
---|
944 | #endif /* IPSEC */ |
---|
945 | inp->inp_gencnt = ++ipi->ipi_gencnt; |
---|
946 | in_pcbremlists(inp); |
---|
947 | #ifdef INET6 |
---|
948 | if (inp->inp_vflag & INP_IPV6PROTO) { |
---|
949 | ip6_freepcbopts(inp->in6p_outputopts); |
---|
950 | if (inp->in6p_moptions != NULL) |
---|
951 | ip6_freemoptions(inp->in6p_moptions); |
---|
952 | } |
---|
953 | #endif |
---|
954 | if (inp->inp_options) |
---|
955 | (void)m_free(inp->inp_options); |
---|
956 | if (inp->inp_moptions != NULL) |
---|
957 | inp_freemoptions(inp->inp_moptions); |
---|
958 | inp->inp_vflag = 0; |
---|
959 | crfree(inp->inp_cred); |
---|
960 | |
---|
961 | #ifdef MAC |
---|
962 | mac_inpcb_destroy(inp); |
---|
963 | #endif |
---|
964 | INP_WUNLOCK(inp); |
---|
965 | uma_zfree(ipi->ipi_zone, inp); |
---|
966 | } |
---|
967 | |
---|
968 | /* |
---|
969 | * in_pcbref() bumps the reference count on an inpcb in order to maintain |
---|
970 | * stability of an inpcb pointer despite the inpcb lock being released. This |
---|
971 | * is used in TCP when the inpcbinfo lock needs to be acquired or upgraded, |
---|
972 | * but where the inpcb lock is already held. |
---|
973 | * |
---|
974 | * While the inpcb will not be freed, releasing the inpcb lock means that the |
---|
975 | * connection's state may change, so the caller should be careful to |
---|
976 | * revalidate any cached state on reacquiring the lock. Drop the reference |
---|
977 | * using in_pcbrele(). |
---|
978 | */ |
---|
979 | void |
---|
980 | in_pcbref(struct inpcb *inp) |
---|
981 | { |
---|
982 | |
---|
983 | INP_WLOCK_ASSERT(inp); |
---|
984 | |
---|
985 | KASSERT(inp->inp_refcount > 0, ("%s: refcount 0", __func__)); |
---|
986 | |
---|
987 | inp->inp_refcount++; |
---|
988 | } |
---|
989 | |
---|
990 | /* |
---|
991 | * Drop a refcount on an inpcb elevated using in_pcbref(); because a call to |
---|
992 | * in_pcbfree() may have been made between in_pcbref() and in_pcbrele(), we |
---|
993 | * return a flag indicating whether or not the inpcb remains valid. If it is |
---|
994 | * valid, we return with the inpcb lock held. |
---|
995 | */ |
---|
996 | int |
---|
997 | in_pcbrele(struct inpcb *inp) |
---|
998 | { |
---|
999 | #ifdef INVARIANTS |
---|
1000 | struct inpcbinfo *ipi = inp->inp_pcbinfo; |
---|
1001 | #endif |
---|
1002 | |
---|
1003 | KASSERT(inp->inp_refcount > 0, ("%s: refcount 0", __func__)); |
---|
1004 | |
---|
1005 | INP_INFO_WLOCK_ASSERT(ipi); |
---|
1006 | INP_WLOCK_ASSERT(inp); |
---|
1007 | |
---|
1008 | inp->inp_refcount--; |
---|
1009 | if (inp->inp_refcount > 0) |
---|
1010 | return (0); |
---|
1011 | in_pcbfree_internal(inp); |
---|
1012 | return (1); |
---|
1013 | } |
---|
1014 | |
---|
1015 | /* |
---|
1016 | * Unconditionally schedule an inpcb to be freed by decrementing its |
---|
1017 | * reference count, which should occur only after the inpcb has been detached |
---|
1018 | * from its socket. If another thread holds a temporary reference (acquired |
---|
1019 | * using in_pcbref()) then the free is deferred until that reference is |
---|
1020 | * released using in_pcbrele(), but the inpcb is still unlocked. |
---|
1021 | */ |
---|
1022 | void |
---|
1023 | in_pcbfree(struct inpcb *inp) |
---|
1024 | { |
---|
1025 | #ifdef INVARIANTS |
---|
1026 | struct inpcbinfo *ipi = inp->inp_pcbinfo; |
---|
1027 | #endif |
---|
1028 | |
---|
1029 | KASSERT(inp->inp_socket == NULL, ("%s: inp_socket != NULL", |
---|
1030 | __func__)); |
---|
1031 | |
---|
1032 | INP_INFO_WLOCK_ASSERT(ipi); |
---|
1033 | INP_WLOCK_ASSERT(inp); |
---|
1034 | |
---|
1035 | if (!in_pcbrele(inp)) |
---|
1036 | INP_WUNLOCK(inp); |
---|
1037 | } |
---|
1038 | |
---|
1039 | /* |
---|
1040 | * in_pcbdrop() removes an inpcb from hashed lists, releasing its address and |
---|
1041 | * port reservation, and preventing it from being returned by inpcb lookups. |
---|
1042 | * |
---|
1043 | * It is used by TCP to mark an inpcb as unused and avoid future packet |
---|
1044 | * delivery or event notification when a socket remains open but TCP has |
---|
1045 | * closed. This might occur as a result of a shutdown()-initiated TCP close |
---|
1046 | * or a RST on the wire, and allows the port binding to be reused while still |
---|
1047 | * maintaining the invariant that so_pcb always points to a valid inpcb until |
---|
1048 | * in_pcbdetach(). |
---|
1049 | * |
---|
1050 | * XXXRW: An inp_lport of 0 is used to indicate that the inpcb is not on hash |
---|
1051 | * lists, but can lead to confusing netstat output, as open sockets with |
---|
1052 | * closed TCP connections will no longer appear to have their bound port |
---|
1053 | * number. An explicit flag would be better, as it would allow us to leave |
---|
1054 | * the port number intact after the connection is dropped. |
---|
1055 | * |
---|
1056 | * XXXRW: Possibly in_pcbdrop() should also prevent future notifications by |
---|
1057 | * in_pcbnotifyall() and in_pcbpurgeif0()? |
---|
1058 | */ |
---|
1059 | void |
---|
1060 | in_pcbdrop(struct inpcb *inp) |
---|
1061 | { |
---|
1062 | |
---|
1063 | INP_INFO_WLOCK_ASSERT(inp->inp_pcbinfo); |
---|
1064 | INP_WLOCK_ASSERT(inp); |
---|
1065 | |
---|
1066 | inp->inp_flags |= INP_DROPPED; |
---|
1067 | if (inp->inp_flags & INP_INHASHLIST) { |
---|
1068 | struct inpcbport *phd = inp->inp_phd; |
---|
1069 | |
---|
1070 | LIST_REMOVE(inp, inp_hash); |
---|
1071 | LIST_REMOVE(inp, inp_portlist); |
---|
1072 | if (LIST_FIRST(&phd->phd_pcblist) == NULL) { |
---|
1073 | LIST_REMOVE(phd, phd_hash); |
---|
1074 | free(phd, M_PCB); |
---|
1075 | } |
---|
1076 | inp->inp_flags &= ~INP_INHASHLIST; |
---|
1077 | } |
---|
1078 | } |
---|
1079 | |
---|
1080 | /* |
---|
1081 | * Common routines to return the socket addresses associated with inpcbs. |
---|
1082 | */ |
---|
1083 | struct sockaddr * |
---|
1084 | in_sockaddr(in_port_t port, struct in_addr *addr_p) |
---|
1085 | { |
---|
1086 | struct sockaddr_in *sin; |
---|
1087 | |
---|
1088 | sin = malloc(sizeof *sin, M_SONAME, |
---|
1089 | M_WAITOK | M_ZERO); |
---|
1090 | sin->sin_family = AF_INET; |
---|
1091 | sin->sin_len = sizeof(*sin); |
---|
1092 | sin->sin_addr = *addr_p; |
---|
1093 | sin->sin_port = port; |
---|
1094 | |
---|
1095 | return (struct sockaddr *)sin; |
---|
1096 | } |
---|
1097 | |
---|
1098 | int |
---|
1099 | in_getsockaddr(struct socket *so, struct sockaddr **nam) |
---|
1100 | { |
---|
1101 | struct inpcb *inp; |
---|
1102 | struct in_addr addr; |
---|
1103 | in_port_t port; |
---|
1104 | |
---|
1105 | inp = sotoinpcb(so); |
---|
1106 | KASSERT(inp != NULL, ("in_getsockaddr: inp == NULL")); |
---|
1107 | |
---|
1108 | INP_RLOCK(inp); |
---|
1109 | port = inp->inp_lport; |
---|
1110 | addr = inp->inp_laddr; |
---|
1111 | INP_RUNLOCK(inp); |
---|
1112 | |
---|
1113 | *nam = in_sockaddr(port, &addr); |
---|
1114 | return 0; |
---|
1115 | } |
---|
1116 | |
---|
1117 | int |
---|
1118 | in_getpeeraddr(struct socket *so, struct sockaddr **nam) |
---|
1119 | { |
---|
1120 | struct inpcb *inp; |
---|
1121 | struct in_addr addr; |
---|
1122 | in_port_t port; |
---|
1123 | |
---|
1124 | inp = sotoinpcb(so); |
---|
1125 | KASSERT(inp != NULL, ("in_getpeeraddr: inp == NULL")); |
---|
1126 | |
---|
1127 | INP_RLOCK(inp); |
---|
1128 | port = inp->inp_fport; |
---|
1129 | addr = inp->inp_faddr; |
---|
1130 | INP_RUNLOCK(inp); |
---|
1131 | |
---|
1132 | *nam = in_sockaddr(port, &addr); |
---|
1133 | return 0; |
---|
1134 | } |
---|
1135 |
|
---|
1136 | void in_pcbnotifyall(struct inpcbinfo *pcbinfo, struct in_addr faddr, int errno, |
---|
1137 | struct inpcb *(*notify)(struct inpcb *, int)) |
---|
1138 | { |
---|
1139 | struct inpcb *inp, *inp_temp; |
---|
1140 | |
---|
1141 | INP_INFO_WLOCK(pcbinfo); |
---|
1142 | LIST_FOREACH_SAFE(inp, pcbinfo->ipi_listhead, inp_list, inp_temp) { |
---|
1143 | INP_WLOCK(inp); |
---|
1144 | #ifdef INET6 |
---|
1145 | if ((inp->inp_vflag & INP_IPV4) == 0) { |
---|
1146 | INP_WUNLOCK(inp); |
---|
1147 | continue; |
---|
1148 | } |
---|
1149 | #endif |
---|
1150 | if (inp->inp_faddr.s_addr != faddr.s_addr || |
---|
1151 | inp->inp_socket == NULL) { |
---|
1152 | INP_WUNLOCK(inp); |
---|
1153 | continue; |
---|
1154 | } |
---|
1155 | if ((*notify)(inp, errno)) |
---|
1156 | INP_WUNLOCK(inp); |
---|
1157 | } |
---|
1158 | INP_INFO_WUNLOCK(pcbinfo); |
---|
1159 | } |
---|
1160 | |
---|
1161 | void |
---|
1162 | in_pcbpurgeif0(struct inpcbinfo *pcbinfo, struct ifnet *ifp) |
---|
1163 | { |
---|
1164 | struct inpcb *inp; |
---|
1165 | struct ip_moptions *imo; |
---|
1166 | int i, gap; |
---|
1167 | |
---|
1168 | INP_INFO_RLOCK(pcbinfo); |
---|
1169 | LIST_FOREACH(inp, pcbinfo->ipi_listhead, inp_list) { |
---|
1170 | INP_WLOCK(inp); |
---|
1171 | imo = inp->inp_moptions; |
---|
1172 | if ((inp->inp_vflag & INP_IPV4) && |
---|
1173 | imo != NULL) { |
---|
1174 | /* |
---|
1175 | * Unselect the outgoing interface if it is being |
---|
1176 | * detached. |
---|
1177 | */ |
---|
1178 | if (imo->imo_multicast_ifp == ifp) |
---|
1179 | imo->imo_multicast_ifp = NULL; |
---|
1180 | |
---|
1181 | /* |
---|
1182 | * Drop multicast group membership if we joined |
---|
1183 | * through the interface being detached. |
---|
1184 | */ |
---|
1185 | for (i = 0, gap = 0; i < imo->imo_num_memberships; |
---|
1186 | i++) { |
---|
1187 | if (imo->imo_membership[i]->inm_ifp == ifp) { |
---|
1188 | in_delmulti(imo->imo_membership[i]); |
---|
1189 | gap++; |
---|
1190 | } else if (gap != 0) |
---|
1191 | imo->imo_membership[i - gap] = |
---|
1192 | imo->imo_membership[i]; |
---|
1193 | } |
---|
1194 | imo->imo_num_memberships -= gap; |
---|
1195 | } |
---|
1196 | INP_WUNLOCK(inp); |
---|
1197 | } |
---|
1198 | INP_INFO_RUNLOCK(pcbinfo); |
---|
1199 | } |
---|
1200 | |
---|
1201 | /* |
---|
1202 | * Lookup a PCB based on the local address and port. |
---|
1203 | */ |
---|
1204 | #define INP_LOOKUP_MAPPED_PCB_COST 3 |
---|
1205 | struct inpcb * |
---|
1206 | in_pcblookup_local(struct inpcbinfo *pcbinfo, struct in_addr laddr, |
---|
1207 | u_short lport, int wild_okay, struct ucred *cred) |
---|
1208 | { |
---|
1209 | struct inpcb *inp; |
---|
1210 | #ifdef INET6 |
---|
1211 | int matchwild = 3 + INP_LOOKUP_MAPPED_PCB_COST; |
---|
1212 | #else |
---|
1213 | int matchwild = 3; |
---|
1214 | #endif |
---|
1215 | int wildcard; |
---|
1216 | |
---|
1217 | INP_INFO_LOCK_ASSERT(pcbinfo); |
---|
1218 | |
---|
1219 | if (!wild_okay) { |
---|
1220 | struct inpcbhead *head; |
---|
1221 | /* |
---|
1222 | * Look for an unconnected (wildcard foreign addr) PCB that |
---|
1223 | * matches the local address and port we're looking for. |
---|
1224 | */ |
---|
1225 | head = &pcbinfo->ipi_hashbase[INP_PCBHASH(INADDR_ANY, lport, |
---|
1226 | 0, pcbinfo->ipi_hashmask)]; |
---|
1227 | LIST_FOREACH(inp, head, inp_hash) { |
---|
1228 | #ifdef INET6 |
---|
1229 | /* XXX inp locking */ |
---|
1230 | if ((inp->inp_vflag & INP_IPV4) == 0) |
---|
1231 | continue; |
---|
1232 | #endif |
---|
1233 | if (inp->inp_faddr.s_addr == INADDR_ANY && |
---|
1234 | inp->inp_laddr.s_addr == laddr.s_addr && |
---|
1235 | inp->inp_lport == lport) { |
---|
1236 | /* |
---|
1237 | * Found? |
---|
1238 | */ |
---|
1239 | if (cred == NULL || |
---|
1240 | prison_equal_ip4(cred->cr_prison, |
---|
1241 | inp->inp_cred->cr_prison)) |
---|
1242 | return (inp); |
---|
1243 | } |
---|
1244 | } |
---|
1245 | /* |
---|
1246 | * Not found. |
---|
1247 | */ |
---|
1248 | return (NULL); |
---|
1249 | } else { |
---|
1250 | struct inpcbporthead *porthash; |
---|
1251 | struct inpcbport *phd; |
---|
1252 | struct inpcb *match = NULL; |
---|
1253 | /* |
---|
1254 | * Best fit PCB lookup. |
---|
1255 | * |
---|
1256 | * First see if this local port is in use by looking on the |
---|
1257 | * port hash list. |
---|
1258 | */ |
---|
1259 | porthash = &pcbinfo->ipi_porthashbase[INP_PCBPORTHASH(lport, |
---|
1260 | pcbinfo->ipi_porthashmask)]; |
---|
1261 | LIST_FOREACH(phd, porthash, phd_hash) { |
---|
1262 | if (phd->phd_port == lport) |
---|
1263 | break; |
---|
1264 | } |
---|
1265 | if (phd != NULL) { |
---|
1266 | /* |
---|
1267 | * Port is in use by one or more PCBs. Look for best |
---|
1268 | * fit. |
---|
1269 | */ |
---|
1270 | LIST_FOREACH(inp, &phd->phd_pcblist, inp_portlist) { |
---|
1271 | wildcard = 0; |
---|
1272 | if (cred != NULL && |
---|
1273 | !prison_equal_ip4(inp->inp_cred->cr_prison, |
---|
1274 | cred->cr_prison)) |
---|
1275 | continue; |
---|
1276 | #ifdef INET6 |
---|
1277 | /* XXX inp locking */ |
---|
1278 | if ((inp->inp_vflag & INP_IPV4) == 0) |
---|
1279 | continue; |
---|
1280 | /* |
---|
1281 | * We never select the PCB that has |
---|
1282 | * INP_IPV6 flag and is bound to :: if |
---|
1283 | * we have another PCB which is bound |
---|
1284 | * to 0.0.0.0. If a PCB has the |
---|
1285 | * INP_IPV6 flag, then we set its cost |
---|
1286 | * higher than IPv4 only PCBs. |
---|
1287 | * |
---|
1288 | * Note that the case only happens |
---|
1289 | * when a socket is bound to ::, under |
---|
1290 | * the condition that the use of the |
---|
1291 | * mapped address is allowed. |
---|
1292 | */ |
---|
1293 | if ((inp->inp_vflag & INP_IPV6) != 0) |
---|
1294 | wildcard += INP_LOOKUP_MAPPED_PCB_COST; |
---|
1295 | #endif |
---|
1296 | if (inp->inp_faddr.s_addr != INADDR_ANY) |
---|
1297 | wildcard++; |
---|
1298 | if (inp->inp_laddr.s_addr != INADDR_ANY) { |
---|
1299 | if (laddr.s_addr == INADDR_ANY) |
---|
1300 | wildcard++; |
---|
1301 | else if (inp->inp_laddr.s_addr != laddr.s_addr) |
---|
1302 | continue; |
---|
1303 | } else { |
---|
1304 | if (laddr.s_addr != INADDR_ANY) |
---|
1305 | wildcard++; |
---|
1306 | } |
---|
1307 | if (wildcard < matchwild) { |
---|
1308 | match = inp; |
---|
1309 | matchwild = wildcard; |
---|
1310 | if (matchwild == 0) |
---|
1311 | break; |
---|
1312 | } |
---|
1313 | } |
---|
1314 | } |
---|
1315 | return (match); |
---|
1316 | } |
---|
1317 | } |
---|
1318 | #undef INP_LOOKUP_MAPPED_PCB_COST |
---|
1319 | |
---|
1320 | /* |
---|
1321 | * Lookup PCB in hash list. |
---|
1322 | */ |
---|
1323 | struct inpcb * |
---|
1324 | in_pcblookup_hash(struct inpcbinfo *pcbinfo, struct in_addr faddr, |
---|
1325 | u_int fport_arg, struct in_addr laddr, u_int lport_arg, int wildcard, |
---|
1326 | struct ifnet *ifp) |
---|
1327 | { |
---|
1328 | struct inpcbhead *head; |
---|
1329 | struct inpcb *inp, *tmpinp; |
---|
1330 | u_short fport = fport_arg, lport = lport_arg; |
---|
1331 | |
---|
1332 | INP_INFO_LOCK_ASSERT(pcbinfo); |
---|
1333 | |
---|
1334 | /* |
---|
1335 | * First look for an exact match. |
---|
1336 | */ |
---|
1337 | tmpinp = NULL; |
---|
1338 | head = &pcbinfo->ipi_hashbase[INP_PCBHASH(faddr.s_addr, lport, fport, |
---|
1339 | pcbinfo->ipi_hashmask)]; |
---|
1340 | LIST_FOREACH(inp, head, inp_hash) { |
---|
1341 | #ifdef INET6 |
---|
1342 | /* XXX inp locking */ |
---|
1343 | if ((inp->inp_vflag & INP_IPV4) == 0) |
---|
1344 | continue; |
---|
1345 | #endif |
---|
1346 | if (inp->inp_faddr.s_addr == faddr.s_addr && |
---|
1347 | inp->inp_laddr.s_addr == laddr.s_addr && |
---|
1348 | inp->inp_fport == fport && |
---|
1349 | inp->inp_lport == lport) { |
---|
1350 | /* |
---|
1351 | * XXX We should be able to directly return |
---|
1352 | * the inp here, without any checks. |
---|
1353 | * Well unless both bound with SO_REUSEPORT? |
---|
1354 | */ |
---|
1355 | if (prison_flag(inp->inp_cred, PR_IP4)) |
---|
1356 | return (inp); |
---|
1357 | if (tmpinp == NULL) |
---|
1358 | tmpinp = inp; |
---|
1359 | } |
---|
1360 | } |
---|
1361 | if (tmpinp != NULL) |
---|
1362 | return (tmpinp); |
---|
1363 | |
---|
1364 | /* |
---|
1365 | * Then look for a wildcard match, if requested. |
---|
1366 | */ |
---|
1367 | if (wildcard == INPLOOKUP_WILDCARD) { |
---|
1368 | struct inpcb *local_wild = NULL, *local_exact = NULL; |
---|
1369 | #ifdef INET6 |
---|
1370 | struct inpcb *local_wild_mapped = NULL; |
---|
1371 | #endif |
---|
1372 | struct inpcb *jail_wild = NULL; |
---|
1373 | int injail; |
---|
1374 | |
---|
1375 | /* |
---|
1376 | * Order of socket selection - we always prefer jails. |
---|
1377 | * 1. jailed, non-wild. |
---|
1378 | * 2. jailed, wild. |
---|
1379 | * 3. non-jailed, non-wild. |
---|
1380 | * 4. non-jailed, wild. |
---|
1381 | */ |
---|
1382 | |
---|
1383 | head = &pcbinfo->ipi_hashbase[INP_PCBHASH(INADDR_ANY, lport, |
---|
1384 | 0, pcbinfo->ipi_hashmask)]; |
---|
1385 | LIST_FOREACH(inp, head, inp_hash) { |
---|
1386 | #ifdef INET6 |
---|
1387 | /* XXX inp locking */ |
---|
1388 | if ((inp->inp_vflag & INP_IPV4) == 0) |
---|
1389 | continue; |
---|
1390 | #endif |
---|
1391 | if (inp->inp_faddr.s_addr != INADDR_ANY || |
---|
1392 | inp->inp_lport != lport) |
---|
1393 | continue; |
---|
1394 | |
---|
1395 | /* XXX inp locking */ |
---|
1396 | if (ifp && ifp->if_type == IFT_FAITH && |
---|
1397 | (inp->inp_flags & INP_FAITH) == 0) |
---|
1398 | continue; |
---|
1399 | |
---|
1400 | injail = prison_flag(inp->inp_cred, PR_IP4); |
---|
1401 | if (injail) { |
---|
1402 | if (prison_check_ip4(inp->inp_cred, |
---|
1403 | &laddr) != 0) |
---|
1404 | continue; |
---|
1405 | } else { |
---|
1406 | if (local_exact != NULL) |
---|
1407 | continue; |
---|
1408 | } |
---|
1409 | |
---|
1410 | if (inp->inp_laddr.s_addr == laddr.s_addr) { |
---|
1411 | if (injail) |
---|
1412 | return (inp); |
---|
1413 | else |
---|
1414 | local_exact = inp; |
---|
1415 | } else if (inp->inp_laddr.s_addr == INADDR_ANY) { |
---|
1416 | #ifdef INET6 |
---|
1417 | /* XXX inp locking, NULL check */ |
---|
1418 | if (inp->inp_vflag & INP_IPV6PROTO) |
---|
1419 | local_wild_mapped = inp; |
---|
1420 | else |
---|
1421 | #endif /* INET6 */ |
---|
1422 | if (injail) |
---|
1423 | jail_wild = inp; |
---|
1424 | else |
---|
1425 | local_wild = inp; |
---|
1426 | } |
---|
1427 | } /* LIST_FOREACH */ |
---|
1428 | if (jail_wild != NULL) |
---|
1429 | return (jail_wild); |
---|
1430 | if (local_exact != NULL) |
---|
1431 | return (local_exact); |
---|
1432 | if (local_wild != NULL) |
---|
1433 | return (local_wild); |
---|
1434 | #ifdef INET6 |
---|
1435 | if (local_wild_mapped != NULL) |
---|
1436 | return (local_wild_mapped); |
---|
1437 | #endif /* defined(INET6) */ |
---|
1438 | } /* if (wildcard == INPLOOKUP_WILDCARD) */ |
---|
1439 | |
---|
1440 | return (NULL); |
---|
1441 | } |
---|
1442 | |
---|
1443 | /* |
---|
1444 | * Insert PCB onto various hash lists. |
---|
1445 | */ |
---|
1446 | int |
---|
1447 | in_pcbinshash(struct inpcb *inp) |
---|
1448 | { |
---|
1449 | struct inpcbhead *pcbhash; |
---|
1450 | struct inpcbporthead *pcbporthash; |
---|
1451 | struct inpcbinfo *pcbinfo = inp->inp_pcbinfo; |
---|
1452 | struct inpcbport *phd; |
---|
1453 | u_int32_t hashkey_faddr; |
---|
1454 | |
---|
1455 | INP_INFO_WLOCK_ASSERT(pcbinfo); |
---|
1456 | INP_WLOCK_ASSERT(inp); |
---|
1457 | KASSERT((inp->inp_flags & INP_INHASHLIST) == 0, |
---|
1458 | ("in_pcbinshash: INP_INHASHLIST")); |
---|
1459 | |
---|
1460 | #ifdef INET6 |
---|
1461 | if (inp->inp_vflag & INP_IPV6) |
---|
1462 | hashkey_faddr = inp->in6p_faddr.s6_addr32[3] /* XXX */; |
---|
1463 | else |
---|
1464 | #endif /* INET6 */ |
---|
1465 | hashkey_faddr = inp->inp_faddr.s_addr; |
---|
1466 | |
---|
1467 | pcbhash = &pcbinfo->ipi_hashbase[INP_PCBHASH(hashkey_faddr, |
---|
1468 | inp->inp_lport, inp->inp_fport, pcbinfo->ipi_hashmask)]; |
---|
1469 | |
---|
1470 | pcbporthash = &pcbinfo->ipi_porthashbase[ |
---|
1471 | INP_PCBPORTHASH(inp->inp_lport, pcbinfo->ipi_porthashmask)]; |
---|
1472 | |
---|
1473 | /* |
---|
1474 | * Go through port list and look for a head for this lport. |
---|
1475 | */ |
---|
1476 | LIST_FOREACH(phd, pcbporthash, phd_hash) { |
---|
1477 | if (phd->phd_port == inp->inp_lport) |
---|
1478 | break; |
---|
1479 | } |
---|
1480 | /* |
---|
1481 | * If none exists, malloc one and tack it on. |
---|
1482 | */ |
---|
1483 | if (phd == NULL) { |
---|
1484 | phd = malloc(sizeof(struct inpcbport), M_PCB, M_NOWAIT); |
---|
1485 | if (phd == NULL) { |
---|
1486 | return (ENOBUFS); /* XXX */ |
---|
1487 | } |
---|
1488 | phd->phd_port = inp->inp_lport; |
---|
1489 | LIST_INIT(&phd->phd_pcblist); |
---|
1490 | LIST_INSERT_HEAD(pcbporthash, phd, phd_hash); |
---|
1491 | } |
---|
1492 | inp->inp_phd = phd; |
---|
1493 | LIST_INSERT_HEAD(&phd->phd_pcblist, inp, inp_portlist); |
---|
1494 | LIST_INSERT_HEAD(pcbhash, inp, inp_hash); |
---|
1495 | inp->inp_flags |= INP_INHASHLIST; |
---|
1496 | return (0); |
---|
1497 | } |
---|
1498 | |
---|
1499 | /* |
---|
1500 | * Move PCB to the proper hash bucket when { faddr, fport } have been |
---|
1501 | * changed. NOTE: This does not handle the case of the lport changing (the |
---|
1502 | * hashed port list would have to be updated as well), so the lport must |
---|
1503 | * not change after in_pcbinshash() has been called. |
---|
1504 | */ |
---|
1505 | void |
---|
1506 | in_pcbrehash(struct inpcb *inp) |
---|
1507 | { |
---|
1508 | struct inpcbinfo *pcbinfo = inp->inp_pcbinfo; |
---|
1509 | struct inpcbhead *head; |
---|
1510 | u_int32_t hashkey_faddr; |
---|
1511 | |
---|
1512 | INP_INFO_WLOCK_ASSERT(pcbinfo); |
---|
1513 | INP_WLOCK_ASSERT(inp); |
---|
1514 | KASSERT(inp->inp_flags & INP_INHASHLIST, |
---|
1515 | ("in_pcbrehash: !INP_INHASHLIST")); |
---|
1516 | |
---|
1517 | #ifdef INET6 |
---|
1518 | if (inp->inp_vflag & INP_IPV6) |
---|
1519 | hashkey_faddr = inp->in6p_faddr.s6_addr32[3] /* XXX */; |
---|
1520 | else |
---|
1521 | #endif /* INET6 */ |
---|
1522 | hashkey_faddr = inp->inp_faddr.s_addr; |
---|
1523 | |
---|
1524 | head = &pcbinfo->ipi_hashbase[INP_PCBHASH(hashkey_faddr, |
---|
1525 | inp->inp_lport, inp->inp_fport, pcbinfo->ipi_hashmask)]; |
---|
1526 | |
---|
1527 | LIST_REMOVE(inp, inp_hash); |
---|
1528 | LIST_INSERT_HEAD(head, inp, inp_hash); |
---|
1529 | } |
---|
1530 | |
---|
1531 | /* |
---|
1532 | * Remove PCB from various lists. |
---|
1533 | */ |
---|
1534 | static void |
---|
1535 | in_pcbremlists(struct inpcb *inp) |
---|
1536 | { |
---|
1537 | struct inpcbinfo *pcbinfo = inp->inp_pcbinfo; |
---|
1538 | |
---|
1539 | INP_INFO_WLOCK_ASSERT(pcbinfo); |
---|
1540 | INP_WLOCK_ASSERT(inp); |
---|
1541 | |
---|
1542 | inp->inp_gencnt = ++pcbinfo->ipi_gencnt; |
---|
1543 | if (inp->inp_flags & INP_INHASHLIST) { |
---|
1544 | struct inpcbport *phd = inp->inp_phd; |
---|
1545 | |
---|
1546 | LIST_REMOVE(inp, inp_hash); |
---|
1547 | LIST_REMOVE(inp, inp_portlist); |
---|
1548 | if (LIST_FIRST(&phd->phd_pcblist) == NULL) { |
---|
1549 | LIST_REMOVE(phd, phd_hash); |
---|
1550 | free(phd, M_PCB); |
---|
1551 | } |
---|
1552 | inp->inp_flags &= ~INP_INHASHLIST; |
---|
1553 | } |
---|
1554 | LIST_REMOVE(inp, inp_list); |
---|
1555 | pcbinfo->ipi_count--; |
---|
1556 | } |
---|
1557 | |
---|
1558 | /* |
---|
1559 | * A set label operation has occurred at the socket layer, propagate the |
---|
1560 | * label change into the in_pcb for the socket. |
---|
1561 | */ |
---|
1562 | void |
---|
1563 | in_pcbsosetlabel(struct socket *so) |
---|
1564 | { |
---|
1565 | #ifdef MAC |
---|
1566 | struct inpcb *inp; |
---|
1567 | |
---|
1568 | inp = sotoinpcb(so); |
---|
1569 | KASSERT(inp != NULL, ("in_pcbsosetlabel: so->so_pcb == NULL")); |
---|
1570 | |
---|
1571 | INP_WLOCK(inp); |
---|
1572 | SOCK_LOCK(so); |
---|
1573 | mac_inpcb_sosetlabel(so, inp); |
---|
1574 | SOCK_UNLOCK(so); |
---|
1575 | INP_WUNLOCK(inp); |
---|
1576 | #endif |
---|
1577 | } |
---|
1578 | |
---|
1579 | /* |
---|
1580 | * ipport_tick runs once per second, determining if random port allocation |
---|
1581 | * should be continued. If more than ipport_randomcps ports have been |
---|
1582 | * allocated in the last second, then we return to sequential port |
---|
1583 | * allocation. We return to random allocation only once we drop below |
---|
1584 | * ipport_randomcps for at least ipport_randomtime seconds. |
---|
1585 | */ |
---|
1586 | void |
---|
1587 | ipport_tick(void *xtp) |
---|
1588 | { |
---|
1589 | VNET_ITERATOR_DECL(vnet_iter); |
---|
1590 | |
---|
1591 | VNET_LIST_RLOCK_NOSLEEP(); |
---|
1592 | VNET_FOREACH(vnet_iter) { |
---|
1593 | CURVNET_SET(vnet_iter); /* XXX appease INVARIANTS here */ |
---|
1594 | if (V_ipport_tcpallocs <= |
---|
1595 | V_ipport_tcplastcount + V_ipport_randomcps) { |
---|
1596 | if (V_ipport_stoprandom > 0) |
---|
1597 | V_ipport_stoprandom--; |
---|
1598 | } else |
---|
1599 | V_ipport_stoprandom = V_ipport_randomtime; |
---|
1600 | V_ipport_tcplastcount = V_ipport_tcpallocs; |
---|
1601 | CURVNET_RESTORE(); |
---|
1602 | } |
---|
1603 | VNET_LIST_RUNLOCK_NOSLEEP(); |
---|
1604 | callout_reset(&ipport_tick_callout, hz, ipport_tick, NULL); |
---|
1605 | } |
---|
1606 | |
---|
1607 | void |
---|
1608 | inp_wlock(struct inpcb *inp) |
---|
1609 | { |
---|
1610 | |
---|
1611 | INP_WLOCK(inp); |
---|
1612 | } |
---|
1613 | |
---|
1614 | void |
---|
1615 | inp_wunlock(struct inpcb *inp) |
---|
1616 | { |
---|
1617 | |
---|
1618 | INP_WUNLOCK(inp); |
---|
1619 | } |
---|
1620 | |
---|
1621 | void |
---|
1622 | inp_rlock(struct inpcb *inp) |
---|
1623 | { |
---|
1624 | |
---|
1625 | INP_RLOCK(inp); |
---|
1626 | } |
---|
1627 | |
---|
1628 | void |
---|
1629 | inp_runlock(struct inpcb *inp) |
---|
1630 | { |
---|
1631 | |
---|
1632 | INP_RUNLOCK(inp); |
---|
1633 | } |
---|
1634 | |
---|
1635 | #ifdef INVARIANTS |
---|
1636 | void |
---|
1637 | inp_lock_assert(struct inpcb *inp) |
---|
1638 | { |
---|
1639 | |
---|
1640 | INP_WLOCK_ASSERT(inp); |
---|
1641 | } |
---|
1642 | |
---|
1643 | void |
---|
1644 | inp_unlock_assert(struct inpcb *inp) |
---|
1645 | { |
---|
1646 | |
---|
1647 | INP_UNLOCK_ASSERT(inp); |
---|
1648 | } |
---|
1649 | #endif |
---|
1650 | |
---|
1651 | void |
---|
1652 | inp_apply_all(void (*func)(struct inpcb *, void *), void *arg) |
---|
1653 | { |
---|
1654 | struct inpcb *inp; |
---|
1655 | |
---|
1656 | INP_INFO_RLOCK(&V_tcbinfo); |
---|
1657 | LIST_FOREACH(inp, V_tcbinfo.ipi_listhead, inp_list) { |
---|
1658 | INP_WLOCK(inp); |
---|
1659 | func(inp, arg); |
---|
1660 | INP_WUNLOCK(inp); |
---|
1661 | } |
---|
1662 | INP_INFO_RUNLOCK(&V_tcbinfo); |
---|
1663 | } |
---|
1664 | |
---|
1665 | struct socket * |
---|
1666 | inp_inpcbtosocket(struct inpcb *inp) |
---|
1667 | { |
---|
1668 | |
---|
1669 | INP_WLOCK_ASSERT(inp); |
---|
1670 | return (inp->inp_socket); |
---|
1671 | } |
---|
1672 | |
---|
1673 | struct tcpcb * |
---|
1674 | inp_inpcbtotcpcb(struct inpcb *inp) |
---|
1675 | { |
---|
1676 | |
---|
1677 | INP_WLOCK_ASSERT(inp); |
---|
1678 | return ((struct tcpcb *)inp->inp_ppcb); |
---|
1679 | } |
---|
1680 | |
---|
1681 | int |
---|
1682 | inp_ip_tos_get(const struct inpcb *inp) |
---|
1683 | { |
---|
1684 | |
---|
1685 | return (inp->inp_ip_tos); |
---|
1686 | } |
---|
1687 | |
---|
1688 | void |
---|
1689 | inp_ip_tos_set(struct inpcb *inp, int val) |
---|
1690 | { |
---|
1691 | |
---|
1692 | inp->inp_ip_tos = val; |
---|
1693 | } |
---|
1694 | |
---|
1695 | void |
---|
1696 | inp_4tuple_get(struct inpcb *inp, uint32_t *laddr, uint16_t *lp, |
---|
1697 | uint32_t *faddr, uint16_t *fp) |
---|
1698 | { |
---|
1699 | |
---|
1700 | INP_LOCK_ASSERT(inp); |
---|
1701 | *laddr = inp->inp_laddr.s_addr; |
---|
1702 | *faddr = inp->inp_faddr.s_addr; |
---|
1703 | *lp = inp->inp_lport; |
---|
1704 | *fp = inp->inp_fport; |
---|
1705 | } |
---|
1706 | |
---|
1707 | struct inpcb * |
---|
1708 | so_sotoinpcb(struct socket *so) |
---|
1709 | { |
---|
1710 | |
---|
1711 | return (sotoinpcb(so)); |
---|
1712 | } |
---|
1713 | |
---|
1714 | struct tcpcb * |
---|
1715 | so_sototcpcb(struct socket *so) |
---|
1716 | { |
---|
1717 | |
---|
1718 | return (sototcpcb(so)); |
---|
1719 | } |
---|
1720 | |
---|
1721 | #ifdef DDB |
---|
1722 | static void |
---|
1723 | db_print_indent(int indent) |
---|
1724 | { |
---|
1725 | int i; |
---|
1726 | |
---|
1727 | for (i = 0; i < indent; i++) |
---|
1728 | db_printf(" "); |
---|
1729 | } |
---|
1730 | |
---|
1731 | static void |
---|
1732 | db_print_inconninfo(struct in_conninfo *inc, const char *name, int indent) |
---|
1733 | { |
---|
1734 | char faddr_str[48], laddr_str[48]; |
---|
1735 | |
---|
1736 | db_print_indent(indent); |
---|
1737 | db_printf("%s at %p\n", name, inc); |
---|
1738 | |
---|
1739 | indent += 2; |
---|
1740 | |
---|
1741 | #ifdef INET6 |
---|
1742 | if (inc->inc_flags & INC_ISIPV6) { |
---|
1743 | /* IPv6. */ |
---|
1744 | ip6_sprintf(laddr_str, &inc->inc6_laddr); |
---|
1745 | ip6_sprintf(faddr_str, &inc->inc6_faddr); |
---|
1746 | } else { |
---|
1747 | #endif |
---|
1748 | /* IPv4. */ |
---|
1749 | inet_ntoa_r(inc->inc_laddr, laddr_str); |
---|
1750 | inet_ntoa_r(inc->inc_faddr, faddr_str); |
---|
1751 | #ifdef INET6 |
---|
1752 | } |
---|
1753 | #endif |
---|
1754 | db_print_indent(indent); |
---|
1755 | db_printf("inc_laddr %s inc_lport %u\n", laddr_str, |
---|
1756 | ntohs(inc->inc_lport)); |
---|
1757 | db_print_indent(indent); |
---|
1758 | db_printf("inc_faddr %s inc_fport %u\n", faddr_str, |
---|
1759 | ntohs(inc->inc_fport)); |
---|
1760 | } |
---|
1761 | |
---|
1762 | static void |
---|
1763 | db_print_inpflags(int inp_flags) |
---|
1764 | { |
---|
1765 | int comma; |
---|
1766 | |
---|
1767 | comma = 0; |
---|
1768 | if (inp_flags & INP_RECVOPTS) { |
---|
1769 | db_printf("%sINP_RECVOPTS", comma ? ", " : ""); |
---|
1770 | comma = 1; |
---|
1771 | } |
---|
1772 | if (inp_flags & INP_RECVRETOPTS) { |
---|
1773 | db_printf("%sINP_RECVRETOPTS", comma ? ", " : ""); |
---|
1774 | comma = 1; |
---|
1775 | } |
---|
1776 | if (inp_flags & INP_RECVDSTADDR) { |
---|
1777 | db_printf("%sINP_RECVDSTADDR", comma ? ", " : ""); |
---|
1778 | comma = 1; |
---|
1779 | } |
---|
1780 | if (inp_flags & INP_HDRINCL) { |
---|
1781 | db_printf("%sINP_HDRINCL", comma ? ", " : ""); |
---|
1782 | comma = 1; |
---|
1783 | } |
---|
1784 | if (inp_flags & INP_HIGHPORT) { |
---|
1785 | db_printf("%sINP_HIGHPORT", comma ? ", " : ""); |
---|
1786 | comma = 1; |
---|
1787 | } |
---|
1788 | if (inp_flags & INP_LOWPORT) { |
---|
1789 | db_printf("%sINP_LOWPORT", comma ? ", " : ""); |
---|
1790 | comma = 1; |
---|
1791 | } |
---|
1792 | if (inp_flags & INP_ANONPORT) { |
---|
1793 | db_printf("%sINP_ANONPORT", comma ? ", " : ""); |
---|
1794 | comma = 1; |
---|
1795 | } |
---|
1796 | if (inp_flags & INP_RECVIF) { |
---|
1797 | db_printf("%sINP_RECVIF", comma ? ", " : ""); |
---|
1798 | comma = 1; |
---|
1799 | } |
---|
1800 | if (inp_flags & INP_MTUDISC) { |
---|
1801 | db_printf("%sINP_MTUDISC", comma ? ", " : ""); |
---|
1802 | comma = 1; |
---|
1803 | } |
---|
1804 | if (inp_flags & INP_FAITH) { |
---|
1805 | db_printf("%sINP_FAITH", comma ? ", " : ""); |
---|
1806 | comma = 1; |
---|
1807 | } |
---|
1808 | if (inp_flags & INP_RECVTTL) { |
---|
1809 | db_printf("%sINP_RECVTTL", comma ? ", " : ""); |
---|
1810 | comma = 1; |
---|
1811 | } |
---|
1812 | if (inp_flags & INP_DONTFRAG) { |
---|
1813 | db_printf("%sINP_DONTFRAG", comma ? ", " : ""); |
---|
1814 | comma = 1; |
---|
1815 | } |
---|
1816 | if (inp_flags & IN6P_IPV6_V6ONLY) { |
---|
1817 | db_printf("%sIN6P_IPV6_V6ONLY", comma ? ", " : ""); |
---|
1818 | comma = 1; |
---|
1819 | } |
---|
1820 | if (inp_flags & IN6P_PKTINFO) { |
---|
1821 | db_printf("%sIN6P_PKTINFO", comma ? ", " : ""); |
---|
1822 | comma = 1; |
---|
1823 | } |
---|
1824 | if (inp_flags & IN6P_HOPLIMIT) { |
---|
1825 | db_printf("%sIN6P_HOPLIMIT", comma ? ", " : ""); |
---|
1826 | comma = 1; |
---|
1827 | } |
---|
1828 | if (inp_flags & IN6P_HOPOPTS) { |
---|
1829 | db_printf("%sIN6P_HOPOPTS", comma ? ", " : ""); |
---|
1830 | comma = 1; |
---|
1831 | } |
---|
1832 | if (inp_flags & IN6P_DSTOPTS) { |
---|
1833 | db_printf("%sIN6P_DSTOPTS", comma ? ", " : ""); |
---|
1834 | comma = 1; |
---|
1835 | } |
---|
1836 | if (inp_flags & IN6P_RTHDR) { |
---|
1837 | db_printf("%sIN6P_RTHDR", comma ? ", " : ""); |
---|
1838 | comma = 1; |
---|
1839 | } |
---|
1840 | if (inp_flags & IN6P_RTHDRDSTOPTS) { |
---|
1841 | db_printf("%sIN6P_RTHDRDSTOPTS", comma ? ", " : ""); |
---|
1842 | comma = 1; |
---|
1843 | } |
---|
1844 | if (inp_flags & IN6P_TCLASS) { |
---|
1845 | db_printf("%sIN6P_TCLASS", comma ? ", " : ""); |
---|
1846 | comma = 1; |
---|
1847 | } |
---|
1848 | if (inp_flags & IN6P_AUTOFLOWLABEL) { |
---|
1849 | db_printf("%sIN6P_AUTOFLOWLABEL", comma ? ", " : ""); |
---|
1850 | comma = 1; |
---|
1851 | } |
---|
1852 | if (inp_flags & INP_TIMEWAIT) { |
---|
1853 | db_printf("%sINP_TIMEWAIT", comma ? ", " : ""); |
---|
1854 | comma = 1; |
---|
1855 | } |
---|
1856 | if (inp_flags & INP_ONESBCAST) { |
---|
1857 | db_printf("%sINP_ONESBCAST", comma ? ", " : ""); |
---|
1858 | comma = 1; |
---|
1859 | } |
---|
1860 | if (inp_flags & INP_DROPPED) { |
---|
1861 | db_printf("%sINP_DROPPED", comma ? ", " : ""); |
---|
1862 | comma = 1; |
---|
1863 | } |
---|
1864 | if (inp_flags & INP_SOCKREF) { |
---|
1865 | db_printf("%sINP_SOCKREF", comma ? ", " : ""); |
---|
1866 | comma = 1; |
---|
1867 | } |
---|
1868 | if (inp_flags & IN6P_RFC2292) { |
---|
1869 | db_printf("%sIN6P_RFC2292", comma ? ", " : ""); |
---|
1870 | comma = 1; |
---|
1871 | } |
---|
1872 | if (inp_flags & IN6P_MTU) { |
---|
1873 | db_printf("IN6P_MTU%s", comma ? ", " : ""); |
---|
1874 | comma = 1; |
---|
1875 | } |
---|
1876 | } |
---|
1877 | |
---|
1878 | static void |
---|
1879 | db_print_inpvflag(u_char inp_vflag) |
---|
1880 | { |
---|
1881 | int comma; |
---|
1882 | |
---|
1883 | comma = 0; |
---|
1884 | if (inp_vflag & INP_IPV4) { |
---|
1885 | db_printf("%sINP_IPV4", comma ? ", " : ""); |
---|
1886 | comma = 1; |
---|
1887 | } |
---|
1888 | if (inp_vflag & INP_IPV6) { |
---|
1889 | db_printf("%sINP_IPV6", comma ? ", " : ""); |
---|
1890 | comma = 1; |
---|
1891 | } |
---|
1892 | if (inp_vflag & INP_IPV6PROTO) { |
---|
1893 | db_printf("%sINP_IPV6PROTO", comma ? ", " : ""); |
---|
1894 | comma = 1; |
---|
1895 | } |
---|
1896 | } |
---|
1897 | |
---|
1898 | static void |
---|
1899 | db_print_inpcb(struct inpcb *inp, const char *name, int indent) |
---|
1900 | { |
---|
1901 | |
---|
1902 | db_print_indent(indent); |
---|
1903 | db_printf("%s at %p\n", name, inp); |
---|
1904 | |
---|
1905 | indent += 2; |
---|
1906 | |
---|
1907 | db_print_indent(indent); |
---|
1908 | db_printf("inp_flow: 0x%x\n", inp->inp_flow); |
---|
1909 | |
---|
1910 | db_print_inconninfo(&inp->inp_inc, "inp_conninfo", indent); |
---|
1911 | |
---|
1912 | db_print_indent(indent); |
---|
1913 | db_printf("inp_ppcb: %p inp_pcbinfo: %p inp_socket: %p\n", |
---|
1914 | inp->inp_ppcb, inp->inp_pcbinfo, inp->inp_socket); |
---|
1915 | |
---|
1916 | db_print_indent(indent); |
---|
1917 | db_printf("inp_label: %p inp_flags: 0x%x (", |
---|
1918 | inp->inp_label, inp->inp_flags); |
---|
1919 | db_print_inpflags(inp->inp_flags); |
---|
1920 | db_printf(")\n"); |
---|
1921 | |
---|
1922 | db_print_indent(indent); |
---|
1923 | db_printf("inp_sp: %p inp_vflag: 0x%x (", inp->inp_sp, |
---|
1924 | inp->inp_vflag); |
---|
1925 | db_print_inpvflag(inp->inp_vflag); |
---|
1926 | db_printf(")\n"); |
---|
1927 | |
---|
1928 | db_print_indent(indent); |
---|
1929 | db_printf("inp_ip_ttl: %d inp_ip_p: %d inp_ip_minttl: %d\n", |
---|
1930 | inp->inp_ip_ttl, inp->inp_ip_p, inp->inp_ip_minttl); |
---|
1931 | |
---|
1932 | db_print_indent(indent); |
---|
1933 | #ifdef INET6 |
---|
1934 | if (inp->inp_vflag & INP_IPV6) { |
---|
1935 | db_printf("in6p_options: %p in6p_outputopts: %p " |
---|
1936 | "in6p_moptions: %p\n", inp->in6p_options, |
---|
1937 | inp->in6p_outputopts, inp->in6p_moptions); |
---|
1938 | db_printf("in6p_icmp6filt: %p in6p_cksum %d " |
---|
1939 | "in6p_hops %u\n", inp->in6p_icmp6filt, inp->in6p_cksum, |
---|
1940 | inp->in6p_hops); |
---|
1941 | } else |
---|
1942 | #endif |
---|
1943 | { |
---|
1944 | db_printf("inp_ip_tos: %d inp_ip_options: %p " |
---|
1945 | "inp_ip_moptions: %p\n", inp->inp_ip_tos, |
---|
1946 | inp->inp_options, inp->inp_moptions); |
---|
1947 | } |
---|
1948 | |
---|
1949 | db_print_indent(indent); |
---|
1950 | db_printf("inp_phd: %p inp_gencnt: %ju\n", inp->inp_phd, |
---|
1951 | (uintmax_t)inp->inp_gencnt); |
---|
1952 | } |
---|
1953 | |
---|
1954 | DB_SHOW_COMMAND(inpcb, db_show_inpcb) |
---|
1955 | { |
---|
1956 | struct inpcb *inp; |
---|
1957 | |
---|
1958 | if (!have_addr) { |
---|
1959 | db_printf("usage: show inpcb <addr>\n"); |
---|
1960 | return; |
---|
1961 | } |
---|
1962 | inp = (struct inpcb *)addr; |
---|
1963 | |
---|
1964 | db_print_inpcb(inp, "inpcb", 0); |
---|
1965 | } |
---|
1966 | #endif |
---|