1 | /* $Id: socket.c 64617 2016-11-09 16:35:15Z vboxsync $ */
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2 | /** @file
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3 | * NAT - socket handling.
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4 | */
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5 |
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6 | /*
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7 | * Copyright (C) 2006-2016 Oracle Corporation
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8 | *
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9 | * This file is part of VirtualBox Open Source Edition (OSE), as
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10 | * available from http://www.virtualbox.org. This file is free software;
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11 | * you can redistribute it and/or modify it under the terms of the GNU
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12 | * General Public License (GPL) as published by the Free Software
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13 | * Foundation, in version 2 as it comes in the "COPYING" file of the
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14 | * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
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15 | * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
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16 | */
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17 |
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18 | /*
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19 | * This code is based on:
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20 | *
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21 | * Copyright (c) 1995 Danny Gasparovski.
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22 | *
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23 | * Please read the file COPYRIGHT for the
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24 | * terms and conditions of the copyright.
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25 | */
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26 |
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27 | #include <slirp.h>
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28 | #include "ip_icmp.h"
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29 | #include "main.h"
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30 | #ifdef __sun__
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31 | #include <sys/filio.h>
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32 | #endif
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33 | #include <VBox/vmm/pdmdrv.h>
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34 | #if defined (RT_OS_WINDOWS)
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35 | #include <iprt/win/iphlpapi.h>
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36 | #include <icmpapi.h>
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37 | #endif
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38 |
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39 | #if defined(DECLARE_IOVEC) && defined(RT_OS_WINDOWS)
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40 | AssertCompileMembersSameSizeAndOffset(struct iovec, iov_base, WSABUF, buf);
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41 | AssertCompileMembersSameSizeAndOffset(struct iovec, iov_len, WSABUF, len);
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42 | #endif
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43 |
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44 | #ifdef VBOX_WITH_NAT_UDP_SOCKET_CLONE
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45 | /**
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46 | *
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47 | */
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48 | struct socket * soCloneUDPSocketWithForegnAddr(PNATState pData, bool fBindSocket, struct socket *pSo, uint32_t u32ForeignAddr)
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49 | {
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50 | struct socket *pNewSocket = NULL;
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51 | LogFlowFunc(("Enter: fBindSocket:%RTbool, so:%R[natsock], u32ForeignAddr:%RTnaipv4\n", fBindSocket, pSo, u32ForeignAddr));
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52 | pNewSocket = socreate();
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53 | if (!pNewSocket)
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54 | {
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55 | LogFunc(("Can't create socket\n"));
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56 | LogFlowFunc(("Leave: NULL\n"));
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57 | return NULL;
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58 | }
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59 | if (fBindSocket)
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60 | {
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61 | if (udp_attach(pData, pNewSocket, 0) <= 0)
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62 | {
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63 | sofree(pData, pNewSocket);
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64 | LogFunc(("Can't attach fresh created socket\n"));
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65 | return NULL;
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66 | }
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67 | }
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68 | else
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69 | {
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70 | pNewSocket->so_cloneOf = (struct socket *)pSo;
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71 | pNewSocket->s = pSo->s;
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72 | insque(pData, pNewSocket, &udb);
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73 | }
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74 | pNewSocket->so_laddr = pSo->so_laddr;
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75 | pNewSocket->so_lport = pSo->so_lport;
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76 | pNewSocket->so_faddr.s_addr = u32ForeignAddr;
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77 | pNewSocket->so_fport = pSo->so_fport;
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78 | pSo->so_cCloneCounter++;
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79 | LogFlowFunc(("Leave: %R[natsock]\n", pNewSocket));
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80 | return pNewSocket;
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81 | }
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82 |
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83 | struct socket *soLookUpClonedUDPSocket(PNATState pData, const struct socket *pcSo, uint32_t u32ForeignAddress)
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84 | {
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85 | struct socket *pSoClone = NULL;
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86 | LogFlowFunc(("Enter: pcSo:%R[natsock], u32ForeignAddress:%RTnaipv4\n", pcSo, u32ForeignAddress));
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87 | for (pSoClone = udb.so_next; pSoClone != &udb; pSoClone = pSoClone->so_next)
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88 | {
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89 | if ( pSoClone->so_cloneOf
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90 | && pSoClone->so_cloneOf == pcSo
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91 | && pSoClone->so_lport == pcSo->so_lport
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92 | && pSoClone->so_fport == pcSo->so_fport
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93 | && pSoClone->so_laddr.s_addr == pcSo->so_laddr.s_addr
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94 | && pSoClone->so_faddr.s_addr == u32ForeignAddress)
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95 | goto done;
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96 | }
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97 | pSoClone = NULL;
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98 | done:
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99 | LogFlowFunc(("Leave: pSoClone: %R[natsock]\n", pSoClone));
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100 | return pSoClone;
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101 | }
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102 | #endif
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103 |
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104 | #ifdef VBOX_WITH_NAT_SEND2HOME
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105 | DECLINLINE(bool) slirpSend2Home(PNATState pData, struct socket *pSo, const void *pvBuf, uint32_t cbBuf, int iFlags)
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106 | {
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107 | int idxAddr;
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108 | int ret = 0;
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109 | bool fSendDone = false;
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110 | LogFlowFunc(("Enter pSo:%R[natsock] pvBuf: %p, cbBuf: %d, iFlags: %d\n", pSo, pvBuf, cbBuf, iFlags));
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111 | for (idxAddr = 0; idxAddr < pData->cInHomeAddressSize; ++idxAddr)
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112 | {
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113 |
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114 | struct socket *pNewSocket = soCloneUDPSocketWithForegnAddr(pData, pSo, pData->pInSockAddrHomeAddress[idxAddr].sin_addr);
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115 | AssertReturn((pNewSocket, false));
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116 | pData->pInSockAddrHomeAddress[idxAddr].sin_port = pSo->so_fport;
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117 | /** @todo more verbose on errors,
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118 | * @note: we shouldn't care if this send fail or not (we're in broadcast).
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119 | */
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120 | LogFunc(("send %d bytes to %RTnaipv4 from %R[natsock]\n", cbBuf, pData->pInSockAddrHomeAddress[idxAddr].sin_addr.s_addr, pNewSocket));
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121 | ret = sendto(pNewSocket->s, pvBuf, cbBuf, iFlags, (struct sockaddr *)&pData->pInSockAddrHomeAddress[idxAddr], sizeof(struct sockaddr_in));
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122 | if (ret < 0)
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123 | LogFunc(("Failed to send %d bytes to %RTnaipv4\n", cbBuf, pData->pInSockAddrHomeAddress[idxAddr].sin_addr.s_addr));
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124 | fSendDone |= ret > 0;
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125 | }
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126 | LogFlowFunc(("Leave %RTbool\n", fSendDone));
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127 | return fSendDone;
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128 | }
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129 | #endif /* !VBOX_WITH_NAT_SEND2HOME */
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130 |
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131 | #if !defined(RT_OS_WINDOWS)
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132 | static void send_icmp_to_guest(PNATState, char *, size_t, const struct sockaddr_in *);
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133 | static void sorecvfrom_icmp_unix(PNATState, struct socket *);
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134 | #endif /* !RT_OS_WINDOWS */
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135 |
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136 | void
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137 | so_init(void)
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138 | {
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139 | }
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140 |
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141 | struct socket *
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142 | solookup(struct socket *head, struct in_addr laddr,
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143 | u_int lport, struct in_addr faddr, u_int fport)
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144 | {
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145 | struct socket *so;
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146 |
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147 | for (so = head->so_next; so != head; so = so->so_next)
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148 | {
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149 | if ( so->so_lport == lport
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150 | && so->so_laddr.s_addr == laddr.s_addr
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151 | && so->so_faddr.s_addr == faddr.s_addr
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152 | && so->so_fport == fport)
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153 | return so;
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154 | }
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155 |
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156 | return (struct socket *)NULL;
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157 | }
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158 |
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159 | /*
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160 | * Create a new socket, initialise the fields
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161 | * It is the responsibility of the caller to
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162 | * insque() it into the correct linked-list
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163 | */
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164 | struct socket *
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165 | socreate(void)
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166 | {
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167 | struct socket *so;
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168 |
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169 | so = (struct socket *)RTMemAllocZ(sizeof(struct socket));
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170 | if (so)
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171 | {
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172 | so->so_state = SS_NOFDREF;
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173 | so->s = -1;
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174 | #if !defined(RT_OS_WINDOWS)
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175 | so->so_poll_index = -1;
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176 | #endif
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177 | }
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178 | return so;
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179 | }
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180 |
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181 | /*
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182 | * remque and free a socket, clobber cache
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183 | */
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184 | void
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185 | sofree(PNATState pData, struct socket *so)
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186 | {
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187 | LogFlowFunc(("ENTER:%R[natsock]\n", so));
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188 | /*
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189 | * We should not remove socket when polling routine do the polling
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190 | * instead we mark it for deletion.
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191 | */
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192 | if (so->fUnderPolling)
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193 | {
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194 | so->fShouldBeRemoved = 1;
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195 | LogFlowFunc(("LEAVE:%R[natsock] postponed deletion\n", so));
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196 | return;
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197 | }
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198 | /**
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199 | * Check that we don't freeng socket with tcbcb
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200 | */
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201 | Assert(!sototcpcb(so));
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202 | /* udp checks */
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203 | Assert(!so->so_timeout);
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204 | Assert(!so->so_timeout_arg);
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205 | if (so == tcp_last_so)
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206 | tcp_last_so = &tcb;
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207 | else if (so == udp_last_so)
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208 | udp_last_so = &udb;
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209 |
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210 | /* check if mbuf haven't been already freed */
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211 | if (so->so_m != NULL)
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212 | {
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213 | m_freem(pData, so->so_m);
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214 | so->so_m = NULL;
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215 | }
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216 |
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217 | if (so->so_ohdr != NULL)
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218 | {
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219 | RTMemFree(so->so_ohdr);
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220 | so->so_ohdr = NULL;
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221 | }
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222 |
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223 | if (so->so_next && so->so_prev)
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224 | {
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225 | remque(pData, so); /* crashes if so is not in a queue */
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226 | NSOCK_DEC();
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227 | }
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228 |
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229 | RTMemFree(so);
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230 | LogFlowFuncLeave();
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231 | }
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232 |
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233 | /*
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234 | * Read from so's socket into sb_snd, updating all relevant sbuf fields
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235 | * NOTE: This will only be called if it is select()ed for reading, so
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236 | * a read() of 0 (or less) means it's disconnected
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237 | */
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238 | int
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239 | soread(PNATState pData, struct socket *so)
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240 | {
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241 | int n, nn, lss, total;
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242 | struct sbuf *sb = &so->so_snd;
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243 | u_int len = sb->sb_datalen - sb->sb_cc;
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244 | struct iovec iov[2];
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245 | int mss = so->so_tcpcb->t_maxseg;
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246 | int sockerr;
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247 |
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248 | STAM_PROFILE_START(&pData->StatIOread, a);
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249 | STAM_COUNTER_RESET(&pData->StatIORead_in_1);
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250 | STAM_COUNTER_RESET(&pData->StatIORead_in_2);
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251 |
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252 | QSOCKET_LOCK(tcb);
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253 | SOCKET_LOCK(so);
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254 | QSOCKET_UNLOCK(tcb);
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255 |
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256 | LogFlow(("soread: so = %R[natsock]\n", so));
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257 | Log2(("%s: so = %R[natsock] so->so_snd = %R[sbuf]\n", RT_GCC_EXTENSION __PRETTY_FUNCTION__, so, sb));
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258 |
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259 | /*
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260 | * No need to check if there's enough room to read.
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261 | * soread wouldn't have been called if there weren't
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262 | */
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263 |
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264 | len = sb->sb_datalen - sb->sb_cc;
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265 |
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266 | iov[0].iov_base = sb->sb_wptr;
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267 | iov[1].iov_base = 0;
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268 | iov[1].iov_len = 0;
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269 | if (sb->sb_wptr < sb->sb_rptr)
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270 | {
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271 | iov[0].iov_len = sb->sb_rptr - sb->sb_wptr;
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272 | /* Should never succeed, but... */
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273 | if (iov[0].iov_len > len)
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274 | iov[0].iov_len = len;
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275 | if (iov[0].iov_len > mss)
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276 | iov[0].iov_len -= iov[0].iov_len%mss;
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277 | n = 1;
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278 | }
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279 | else
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280 | {
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281 | iov[0].iov_len = (sb->sb_data + sb->sb_datalen) - sb->sb_wptr;
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282 | /* Should never succeed, but... */
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283 | if (iov[0].iov_len > len)
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284 | iov[0].iov_len = len;
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285 | len -= iov[0].iov_len;
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286 | if (len)
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287 | {
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288 | iov[1].iov_base = sb->sb_data;
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289 | iov[1].iov_len = sb->sb_rptr - sb->sb_data;
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290 | if (iov[1].iov_len > len)
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291 | iov[1].iov_len = len;
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292 | total = iov[0].iov_len + iov[1].iov_len;
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293 | if (total > mss)
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294 | {
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295 | lss = total % mss;
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296 | if (iov[1].iov_len > lss)
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297 | {
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298 | iov[1].iov_len -= lss;
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299 | n = 2;
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300 | }
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301 | else
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302 | {
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303 | lss -= iov[1].iov_len;
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304 | iov[0].iov_len -= lss;
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305 | n = 1;
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306 | }
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307 | }
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308 | else
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309 | n = 2;
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310 | }
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311 | else
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312 | {
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313 | if (iov[0].iov_len > mss)
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314 | iov[0].iov_len -= iov[0].iov_len%mss;
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315 | n = 1;
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316 | }
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317 | }
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318 |
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319 | #ifdef HAVE_READV
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320 | nn = readv(so->s, (struct iovec *)iov, n);
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321 | #else
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322 | nn = recv(so->s, iov[0].iov_base, iov[0].iov_len, (so->so_tcpcb->t_force? MSG_OOB:0));
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323 | #endif
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324 | if (nn < 0)
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325 | sockerr = errno; /* save it, as it may be clobbered by logging */
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326 | else
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327 | sockerr = 0;
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328 |
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329 | Log2(("%s: read(1) nn = %d bytes\n", RT_GCC_EXTENSION __PRETTY_FUNCTION__, nn));
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330 | Log2(("%s: so = %R[natsock] so->so_snd = %R[sbuf]\n", RT_GCC_EXTENSION __PRETTY_FUNCTION__, so, sb));
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331 | if (nn <= 0)
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332 | {
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333 | #ifdef RT_OS_WINDOWS
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334 | /*
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335 | * Windows reports ESHUTDOWN after SHUT_RD (SD_RECEIVE)
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336 | * instead of just returning EOF indication.
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337 | */
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338 | if (nn < 0 && sockerr == ESHUTDOWN)
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339 | {
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340 | nn = 0;
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341 | sockerr = 0;
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342 | }
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343 | #endif
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344 |
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345 | if (nn == 0) /* XXX: should this be inside #if defined(RT_OS_WINDOWS)? */
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346 | {
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347 | /*
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348 | * Special case for WSAEnumNetworkEvents: If we receive 0 bytes that
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349 | * _could_ mean that the connection is closed. But we will receive an
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350 | * FD_CLOSE event later if the connection was _really_ closed. With
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351 | * www.youtube.com I see this very often. Closing the socket too early
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352 | * would be dangerous.
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353 | */
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354 | int status;
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355 | unsigned long pending = 0;
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356 | status = ioctlsocket(so->s, FIONREAD, &pending);
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357 | if (status < 0)
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358 | Log(("NAT:%s: error in WSAIoctl: %d\n", RT_GCC_EXTENSION __PRETTY_FUNCTION__, errno));
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359 | if (pending != 0)
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360 | {
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361 | SOCKET_UNLOCK(so);
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362 | STAM_PROFILE_STOP(&pData->StatIOread, a);
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363 | return 0;
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364 | }
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365 | }
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366 |
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367 | if ( nn < 0
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368 | && soIgnorableErrorCode(sockerr))
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369 | {
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370 | SOCKET_UNLOCK(so);
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371 | STAM_PROFILE_STOP(&pData->StatIOread, a);
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372 | return 0;
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373 | }
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374 | else
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375 | {
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376 | int fUninitializedTemplate = 0;
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377 | int shuterr;
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378 |
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379 | fUninitializedTemplate = RT_BOOL(( sototcpcb(so)
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380 | && ( sototcpcb(so)->t_template.ti_src.s_addr == INADDR_ANY
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381 | || sototcpcb(so)->t_template.ti_dst.s_addr == INADDR_ANY)));
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382 | /* nn == 0 means peer has performed an orderly shutdown */
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383 | Log2(("%s: disconnected, nn = %d, errno = %d (%s)\n",
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384 | RT_GCC_EXTENSION __PRETTY_FUNCTION__, nn, sockerr, strerror(sockerr)));
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385 |
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386 | shuterr = sofcantrcvmore(so);
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387 | if (!sockerr && !shuterr && !fUninitializedTemplate)
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388 | tcp_sockclosed(pData, sototcpcb(so));
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389 | else
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390 | {
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391 | LogRel2(("NAT: sockerr %d, shuterr %d - %R[natsock]\n", sockerr, shuterr, so));
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392 | tcp_drop(pData, sototcpcb(so), sockerr);
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393 | }
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394 | SOCKET_UNLOCK(so);
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395 | STAM_PROFILE_STOP(&pData->StatIOread, a);
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396 | return -1;
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397 | }
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398 | }
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399 | STAM_STATS(
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400 | if (n == 1)
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401 | {
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402 | STAM_COUNTER_INC(&pData->StatIORead_in_1);
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403 | STAM_COUNTER_ADD(&pData->StatIORead_in_1_bytes, nn);
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404 | }
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405 | else
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406 | {
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407 | STAM_COUNTER_INC(&pData->StatIORead_in_2);
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408 | STAM_COUNTER_ADD(&pData->StatIORead_in_2_1st_bytes, nn);
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409 | }
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410 | );
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411 |
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412 | #ifndef HAVE_READV
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413 | /*
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414 | * If there was no error, try and read the second time round
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415 | * We read again if n = 2 (ie, there's another part of the buffer)
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416 | * and we read as much as we could in the first read
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417 | * We don't test for <= 0 this time, because there legitimately
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418 | * might not be any more data (since the socket is non-blocking),
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419 | * a close will be detected on next iteration.
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420 | * A return of -1 wont (shouldn't) happen, since it didn't happen above
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421 | */
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422 | if (n == 2 && (unsigned)nn == iov[0].iov_len)
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---|
423 | {
|
---|
424 | int ret;
|
---|
425 | ret = recv(so->s, iov[1].iov_base, iov[1].iov_len, 0);
|
---|
426 | if (ret > 0)
|
---|
427 | nn += ret;
|
---|
428 | STAM_STATS(
|
---|
429 | if (ret > 0)
|
---|
430 | {
|
---|
431 | STAM_COUNTER_INC(&pData->StatIORead_in_2);
|
---|
432 | STAM_COUNTER_ADD(&pData->StatIORead_in_2_2nd_bytes, ret);
|
---|
433 | }
|
---|
434 | );
|
---|
435 | }
|
---|
436 |
|
---|
437 | Log2(("%s: read(2) nn = %d bytes\n", RT_GCC_EXTENSION __PRETTY_FUNCTION__, nn));
|
---|
438 | #endif
|
---|
439 |
|
---|
440 | /* Update fields */
|
---|
441 | sb->sb_cc += nn;
|
---|
442 | sb->sb_wptr += nn;
|
---|
443 | Log2(("%s: update so_snd (readed nn = %d) %R[sbuf]\n", RT_GCC_EXTENSION __PRETTY_FUNCTION__, nn, sb));
|
---|
444 | if (sb->sb_wptr >= (sb->sb_data + sb->sb_datalen))
|
---|
445 | {
|
---|
446 | sb->sb_wptr -= sb->sb_datalen;
|
---|
447 | Log2(("%s: alter sb_wptr so_snd = %R[sbuf]\n", RT_GCC_EXTENSION __PRETTY_FUNCTION__, sb));
|
---|
448 | }
|
---|
449 | STAM_PROFILE_STOP(&pData->StatIOread, a);
|
---|
450 | SOCKET_UNLOCK(so);
|
---|
451 | return nn;
|
---|
452 | }
|
---|
453 |
|
---|
454 | /*
|
---|
455 | * Get urgent data
|
---|
456 | *
|
---|
457 | * When the socket is created, we set it SO_OOBINLINE,
|
---|
458 | * so when OOB data arrives, we soread() it and everything
|
---|
459 | * in the send buffer is sent as urgent data
|
---|
460 | */
|
---|
461 | void
|
---|
462 | sorecvoob(PNATState pData, struct socket *so)
|
---|
463 | {
|
---|
464 | struct tcpcb *tp = sototcpcb(so);
|
---|
465 | ssize_t ret;
|
---|
466 |
|
---|
467 | LogFlowFunc(("sorecvoob: so = %R[natsock]\n", so));
|
---|
468 |
|
---|
469 | /*
|
---|
470 | * We take a guess at how much urgent data has arrived.
|
---|
471 | * In most situations, when urgent data arrives, the next
|
---|
472 | * read() should get all the urgent data. This guess will
|
---|
473 | * be wrong however if more data arrives just after the
|
---|
474 | * urgent data, or the read() doesn't return all the
|
---|
475 | * urgent data.
|
---|
476 | */
|
---|
477 | ret = soread(pData, so);
|
---|
478 | if (RT_LIKELY(ret > 0))
|
---|
479 | {
|
---|
480 | tp->snd_up = tp->snd_una + SBUF_LEN(&so->so_snd);
|
---|
481 | tp->t_force = 1;
|
---|
482 | tcp_output(pData, tp);
|
---|
483 | tp->t_force = 0;
|
---|
484 | }
|
---|
485 | }
|
---|
486 |
|
---|
487 | /*
|
---|
488 | * Send urgent data
|
---|
489 | * There's a lot duplicated code here, but...
|
---|
490 | */
|
---|
491 | int
|
---|
492 | sosendoob(struct socket *so)
|
---|
493 | {
|
---|
494 | struct sbuf *sb = &so->so_rcv;
|
---|
495 | char buff[2048]; /* XXX Shouldn't be sending more oob data than this */
|
---|
496 |
|
---|
497 | int n, len;
|
---|
498 |
|
---|
499 | LogFlowFunc(("sosendoob so = %R[natsock]\n", so));
|
---|
500 |
|
---|
501 | if (so->so_urgc > sizeof(buff))
|
---|
502 | so->so_urgc = sizeof(buff); /* XXX */
|
---|
503 |
|
---|
504 | if (sb->sb_rptr < sb->sb_wptr)
|
---|
505 | {
|
---|
506 | /* We can send it directly */
|
---|
507 | n = send(so->s, sb->sb_rptr, so->so_urgc, (MSG_OOB)); /* |MSG_DONTWAIT)); */
|
---|
508 | so->so_urgc -= n;
|
---|
509 |
|
---|
510 | Log2((" --- sent %d bytes urgent data, %d urgent bytes left\n",
|
---|
511 | n, so->so_urgc));
|
---|
512 | }
|
---|
513 | else
|
---|
514 | {
|
---|
515 | /*
|
---|
516 | * Since there's no sendv or sendtov like writev,
|
---|
517 | * we must copy all data to a linear buffer then
|
---|
518 | * send it all
|
---|
519 | */
|
---|
520 | len = (sb->sb_data + sb->sb_datalen) - sb->sb_rptr;
|
---|
521 | if (len > so->so_urgc)
|
---|
522 | len = so->so_urgc;
|
---|
523 | memcpy(buff, sb->sb_rptr, len);
|
---|
524 | so->so_urgc -= len;
|
---|
525 | if (so->so_urgc)
|
---|
526 | {
|
---|
527 | n = sb->sb_wptr - sb->sb_data;
|
---|
528 | if (n > so->so_urgc)
|
---|
529 | n = so->so_urgc;
|
---|
530 | memcpy(buff + len, sb->sb_data, n);
|
---|
531 | so->so_urgc -= n;
|
---|
532 | len += n;
|
---|
533 | }
|
---|
534 | n = send(so->s, buff, len, (MSG_OOB)); /* |MSG_DONTWAIT)); */
|
---|
535 | #ifdef DEBUG
|
---|
536 | if (n != len)
|
---|
537 | Log(("Didn't send all data urgently XXXXX\n"));
|
---|
538 | #endif
|
---|
539 | Log2((" ---2 sent %d bytes urgent data, %d urgent bytes left\n",
|
---|
540 | n, so->so_urgc));
|
---|
541 | }
|
---|
542 |
|
---|
543 | sb->sb_cc -= n;
|
---|
544 | sb->sb_rptr += n;
|
---|
545 | if (sb->sb_rptr >= (sb->sb_data + sb->sb_datalen))
|
---|
546 | sb->sb_rptr -= sb->sb_datalen;
|
---|
547 |
|
---|
548 | return n;
|
---|
549 | }
|
---|
550 |
|
---|
551 | /*
|
---|
552 | * Write data from so_rcv to so's socket,
|
---|
553 | * updating all sbuf field as necessary
|
---|
554 | */
|
---|
555 | int
|
---|
556 | sowrite(PNATState pData, struct socket *so)
|
---|
557 | {
|
---|
558 | int n, nn;
|
---|
559 | struct sbuf *sb = &so->so_rcv;
|
---|
560 | u_int len = sb->sb_cc;
|
---|
561 | struct iovec iov[2];
|
---|
562 |
|
---|
563 | STAM_PROFILE_START(&pData->StatIOwrite, a);
|
---|
564 | STAM_COUNTER_RESET(&pData->StatIOWrite_in_1);
|
---|
565 | STAM_COUNTER_RESET(&pData->StatIOWrite_in_1_bytes);
|
---|
566 | STAM_COUNTER_RESET(&pData->StatIOWrite_in_2);
|
---|
567 | STAM_COUNTER_RESET(&pData->StatIOWrite_in_2_1st_bytes);
|
---|
568 | STAM_COUNTER_RESET(&pData->StatIOWrite_in_2_2nd_bytes);
|
---|
569 | STAM_COUNTER_RESET(&pData->StatIOWrite_no_w);
|
---|
570 | STAM_COUNTER_RESET(&pData->StatIOWrite_rest);
|
---|
571 | STAM_COUNTER_RESET(&pData->StatIOWrite_rest_bytes);
|
---|
572 | LogFlowFunc(("so = %R[natsock]\n", so));
|
---|
573 | Log2(("%s: so = %R[natsock] so->so_rcv = %R[sbuf]\n", RT_GCC_EXTENSION __PRETTY_FUNCTION__, so, sb));
|
---|
574 | QSOCKET_LOCK(tcb);
|
---|
575 | SOCKET_LOCK(so);
|
---|
576 | QSOCKET_UNLOCK(tcb);
|
---|
577 | if (so->so_urgc)
|
---|
578 | {
|
---|
579 | sosendoob(so);
|
---|
580 | if (sb->sb_cc == 0)
|
---|
581 | {
|
---|
582 | SOCKET_UNLOCK(so);
|
---|
583 | STAM_PROFILE_STOP(&pData->StatIOwrite, a);
|
---|
584 | return 0;
|
---|
585 | }
|
---|
586 | }
|
---|
587 |
|
---|
588 | /*
|
---|
589 | * No need to check if there's something to write,
|
---|
590 | * sowrite wouldn't have been called otherwise
|
---|
591 | */
|
---|
592 |
|
---|
593 | len = sb->sb_cc;
|
---|
594 |
|
---|
595 | iov[0].iov_base = sb->sb_rptr;
|
---|
596 | iov[1].iov_base = 0;
|
---|
597 | iov[1].iov_len = 0;
|
---|
598 | if (sb->sb_rptr < sb->sb_wptr)
|
---|
599 | {
|
---|
600 | iov[0].iov_len = sb->sb_wptr - sb->sb_rptr;
|
---|
601 | /* Should never succeed, but... */
|
---|
602 | if (iov[0].iov_len > len)
|
---|
603 | iov[0].iov_len = len;
|
---|
604 | n = 1;
|
---|
605 | }
|
---|
606 | else
|
---|
607 | {
|
---|
608 | iov[0].iov_len = (sb->sb_data + sb->sb_datalen) - sb->sb_rptr;
|
---|
609 | if (iov[0].iov_len > len)
|
---|
610 | iov[0].iov_len = len;
|
---|
611 | len -= iov[0].iov_len;
|
---|
612 | if (len)
|
---|
613 | {
|
---|
614 | iov[1].iov_base = sb->sb_data;
|
---|
615 | iov[1].iov_len = sb->sb_wptr - sb->sb_data;
|
---|
616 | if (iov[1].iov_len > len)
|
---|
617 | iov[1].iov_len = len;
|
---|
618 | n = 2;
|
---|
619 | }
|
---|
620 | else
|
---|
621 | n = 1;
|
---|
622 | }
|
---|
623 | STAM_STATS({
|
---|
624 | if (n == 1)
|
---|
625 | {
|
---|
626 | STAM_COUNTER_INC(&pData->StatIOWrite_in_1);
|
---|
627 | STAM_COUNTER_ADD(&pData->StatIOWrite_in_1_bytes, iov[0].iov_len);
|
---|
628 | }
|
---|
629 | else
|
---|
630 | {
|
---|
631 | STAM_COUNTER_INC(&pData->StatIOWrite_in_2);
|
---|
632 | STAM_COUNTER_ADD(&pData->StatIOWrite_in_2_1st_bytes, iov[0].iov_len);
|
---|
633 | STAM_COUNTER_ADD(&pData->StatIOWrite_in_2_2nd_bytes, iov[1].iov_len);
|
---|
634 | }
|
---|
635 | });
|
---|
636 | /* Check if there's urgent data to send, and if so, send it */
|
---|
637 | #ifdef HAVE_READV
|
---|
638 | nn = writev(so->s, (const struct iovec *)iov, n);
|
---|
639 | #else
|
---|
640 | nn = send(so->s, iov[0].iov_base, iov[0].iov_len, 0);
|
---|
641 | #endif
|
---|
642 | Log2(("%s: wrote(1) nn = %d bytes\n", RT_GCC_EXTENSION __PRETTY_FUNCTION__, nn));
|
---|
643 | /* This should never happen, but people tell me it does *shrug* */
|
---|
644 | if ( nn < 0
|
---|
645 | && soIgnorableErrorCode(errno))
|
---|
646 | {
|
---|
647 | SOCKET_UNLOCK(so);
|
---|
648 | STAM_PROFILE_STOP(&pData->StatIOwrite, a);
|
---|
649 | return 0;
|
---|
650 | }
|
---|
651 |
|
---|
652 | if (nn < 0 || (nn == 0 && iov[0].iov_len > 0))
|
---|
653 | {
|
---|
654 | Log2(("%s: disconnected, so->so_state = %x, errno = %d\n",
|
---|
655 | RT_GCC_EXTENSION __PRETTY_FUNCTION__, so->so_state, errno));
|
---|
656 | sofcantsendmore(so);
|
---|
657 | tcp_sockclosed(pData, sototcpcb(so));
|
---|
658 | SOCKET_UNLOCK(so);
|
---|
659 | STAM_PROFILE_STOP(&pData->StatIOwrite, a);
|
---|
660 | return -1;
|
---|
661 | }
|
---|
662 |
|
---|
663 | #ifndef HAVE_READV
|
---|
664 | if (n == 2 && (unsigned)nn == iov[0].iov_len)
|
---|
665 | {
|
---|
666 | int ret;
|
---|
667 | ret = send(so->s, iov[1].iov_base, iov[1].iov_len, 0);
|
---|
668 | if (ret > 0)
|
---|
669 | nn += ret;
|
---|
670 | # ifdef VBOX_WITH_STATISTICS
|
---|
671 | if (ret > 0 && ret != (ssize_t)iov[1].iov_len)
|
---|
672 | {
|
---|
673 | STAM_COUNTER_INC(&pData->StatIOWrite_rest);
|
---|
674 | STAM_COUNTER_ADD(&pData->StatIOWrite_rest_bytes, (iov[1].iov_len - ret));
|
---|
675 | }
|
---|
676 | #endif
|
---|
677 | }
|
---|
678 | Log2(("%s: wrote(2) nn = %d bytes\n", RT_GCC_EXTENSION __PRETTY_FUNCTION__, nn));
|
---|
679 | #endif
|
---|
680 |
|
---|
681 | /* Update sbuf */
|
---|
682 | sb->sb_cc -= nn;
|
---|
683 | sb->sb_rptr += nn;
|
---|
684 | Log2(("%s: update so_rcv (written nn = %d) %R[sbuf]\n", RT_GCC_EXTENSION __PRETTY_FUNCTION__, nn, sb));
|
---|
685 | if (sb->sb_rptr >= (sb->sb_data + sb->sb_datalen))
|
---|
686 | {
|
---|
687 | sb->sb_rptr -= sb->sb_datalen;
|
---|
688 | Log2(("%s: alter sb_rptr of so_rcv %R[sbuf]\n", RT_GCC_EXTENSION __PRETTY_FUNCTION__, sb));
|
---|
689 | }
|
---|
690 |
|
---|
691 | /*
|
---|
692 | * If in DRAIN mode, and there's no more data, set
|
---|
693 | * it CANTSENDMORE
|
---|
694 | */
|
---|
695 | if ((so->so_state & SS_FWDRAIN) && sb->sb_cc == 0)
|
---|
696 | sofcantsendmore(so);
|
---|
697 |
|
---|
698 | SOCKET_UNLOCK(so);
|
---|
699 | STAM_PROFILE_STOP(&pData->StatIOwrite, a);
|
---|
700 | return nn;
|
---|
701 | }
|
---|
702 |
|
---|
703 | /*
|
---|
704 | * recvfrom() a UDP socket
|
---|
705 | */
|
---|
706 | void
|
---|
707 | sorecvfrom(PNATState pData, struct socket *so)
|
---|
708 | {
|
---|
709 | LogFlowFunc(("sorecvfrom: so = %p\n", so));
|
---|
710 |
|
---|
711 | #ifdef RT_OS_WINDOWS
|
---|
712 | /* ping is handled with ICMP API in ip_icmpwin.c */
|
---|
713 | Assert(so->so_type == IPPROTO_UDP);
|
---|
714 | #else
|
---|
715 | if (so->so_type == IPPROTO_ICMP)
|
---|
716 | {
|
---|
717 | /* This is a "ping" reply */
|
---|
718 | sorecvfrom_icmp_unix(pData, so);
|
---|
719 | udp_detach(pData, so);
|
---|
720 | }
|
---|
721 | else
|
---|
722 | #endif /* !RT_OS_WINDOWS */
|
---|
723 | {
|
---|
724 | static char achBuf[64 * 1024];
|
---|
725 |
|
---|
726 | /* A "normal" UDP packet */
|
---|
727 | struct sockaddr_in addr;
|
---|
728 | socklen_t addrlen = sizeof(struct sockaddr_in);
|
---|
729 | struct iovec iov[2];
|
---|
730 | ssize_t nread;
|
---|
731 | struct mbuf *m;
|
---|
732 |
|
---|
733 | QSOCKET_LOCK(udb);
|
---|
734 | SOCKET_LOCK(so);
|
---|
735 | QSOCKET_UNLOCK(udb);
|
---|
736 |
|
---|
737 | m = m_getjcl(pData, M_NOWAIT, MT_HEADER, M_PKTHDR, slirp_size(pData));
|
---|
738 | if (m == NULL)
|
---|
739 | {
|
---|
740 | SOCKET_UNLOCK(so);
|
---|
741 | return;
|
---|
742 | }
|
---|
743 |
|
---|
744 | m->m_data += ETH_HLEN;
|
---|
745 | m->m_pkthdr.header = mtod(m, void *);
|
---|
746 |
|
---|
747 | m->m_data += sizeof(struct udpiphdr);
|
---|
748 |
|
---|
749 | /* small packets will fit without copying */
|
---|
750 | iov[0].iov_base = mtod(m, char *);
|
---|
751 | iov[0].iov_len = M_TRAILINGSPACE(m);
|
---|
752 |
|
---|
753 | /* large packets will spill into a temp buffer */
|
---|
754 | iov[1].iov_base = achBuf;
|
---|
755 | iov[1].iov_len = sizeof(achBuf);
|
---|
756 |
|
---|
757 | #if !defined(RT_OS_WINDOWS)
|
---|
758 | {
|
---|
759 | struct msghdr mh;
|
---|
760 | memset(&mh, 0, sizeof(mh));
|
---|
761 |
|
---|
762 | mh.msg_iov = iov;
|
---|
763 | mh.msg_iovlen = 2;
|
---|
764 | mh.msg_name = &addr;
|
---|
765 | mh.msg_namelen = addrlen;
|
---|
766 |
|
---|
767 | nread = recvmsg(so->s, &mh, 0);
|
---|
768 | }
|
---|
769 | #else /* RT_OS_WINDOWS */
|
---|
770 | {
|
---|
771 | DWORD nbytes; /* NB: can't use nread b/c of different size */
|
---|
772 | DWORD flags = 0;
|
---|
773 | int status;
|
---|
774 | AssertCompile(sizeof(WSABUF) == sizeof(struct iovec));
|
---|
775 | AssertCompileMembersSameSizeAndOffset(WSABUF, len, struct iovec, iov_len);
|
---|
776 | AssertCompileMembersSameSizeAndOffset(WSABUF, buf, struct iovec, iov_base);
|
---|
777 | status = WSARecvFrom(so->s, (WSABUF *)&iov[0], 2, &nbytes, &flags,
|
---|
778 | (struct sockaddr *)&addr, &addrlen,
|
---|
779 | NULL, NULL);
|
---|
780 | if (status != SOCKET_ERROR)
|
---|
781 | nread = nbytes;
|
---|
782 | else
|
---|
783 | nread = -1;
|
---|
784 | }
|
---|
785 | #endif
|
---|
786 | if (nread >= 0)
|
---|
787 | {
|
---|
788 | if (nread <= iov[0].iov_len)
|
---|
789 | m->m_len = nread;
|
---|
790 | else
|
---|
791 | {
|
---|
792 | m->m_len = iov[0].iov_len;
|
---|
793 | m_append(pData, m, nread - iov[0].iov_len, iov[1].iov_base);
|
---|
794 | }
|
---|
795 | Assert(m_length(m, NULL) == (size_t)nread);
|
---|
796 |
|
---|
797 | /*
|
---|
798 | * Hack: domain name lookup will be used the most for UDP,
|
---|
799 | * and since they'll only be used once there's no need
|
---|
800 | * for the 4 minute (or whatever) timeout... So we time them
|
---|
801 | * out much quicker (10 seconds for now...)
|
---|
802 | */
|
---|
803 | if (so->so_expire)
|
---|
804 | {
|
---|
805 | if (so->so_fport != RT_H2N_U16_C(53))
|
---|
806 | so->so_expire = curtime + SO_EXPIRE;
|
---|
807 | }
|
---|
808 |
|
---|
809 | /*
|
---|
810 | * DNS proxy requests are forwarded to the real resolver,
|
---|
811 | * but its socket's so_faddr is that of the DNS proxy
|
---|
812 | * itself.
|
---|
813 | *
|
---|
814 | * last argument should be changed if Slirp will inject IP attributes
|
---|
815 | */
|
---|
816 | if ( pData->fUseDnsProxy
|
---|
817 | && so->so_fport == RT_H2N_U16_C(53)
|
---|
818 | && CTL_CHECK(so->so_faddr.s_addr, CTL_DNS))
|
---|
819 | dnsproxy_answer(pData, so, m);
|
---|
820 |
|
---|
821 | /* packets definetly will be fragmented, could confuse receiver peer. */
|
---|
822 | if (nread > if_mtu)
|
---|
823 | m->m_flags |= M_SKIP_FIREWALL;
|
---|
824 |
|
---|
825 | /*
|
---|
826 | * If this packet was destined for CTL_ADDR,
|
---|
827 | * make it look like that's where it came from, done by udp_output
|
---|
828 | */
|
---|
829 | udp_output(pData, so, m, &addr);
|
---|
830 | }
|
---|
831 | else
|
---|
832 | {
|
---|
833 | m_freem(pData, m);
|
---|
834 |
|
---|
835 | if (!soIgnorableErrorCode(errno))
|
---|
836 | {
|
---|
837 | u_char code;
|
---|
838 | if (errno == EHOSTUNREACH)
|
---|
839 | code = ICMP_UNREACH_HOST;
|
---|
840 | else if (errno == ENETUNREACH)
|
---|
841 | code = ICMP_UNREACH_NET;
|
---|
842 | else
|
---|
843 | code = ICMP_UNREACH_PORT;
|
---|
844 |
|
---|
845 | Log2((" rx error, tx icmp ICMP_UNREACH:%i\n", code));
|
---|
846 | icmp_error(pData, so->so_m, ICMP_UNREACH, code, 0, strerror(errno));
|
---|
847 | so->so_m = NULL;
|
---|
848 | }
|
---|
849 | }
|
---|
850 |
|
---|
851 | SOCKET_UNLOCK(so);
|
---|
852 | }
|
---|
853 | }
|
---|
854 |
|
---|
855 | /*
|
---|
856 | * sendto() a socket
|
---|
857 | */
|
---|
858 | int
|
---|
859 | sosendto(PNATState pData, struct socket *so, struct mbuf *m)
|
---|
860 | {
|
---|
861 | int ret;
|
---|
862 | struct sockaddr_in *paddr;
|
---|
863 | struct sockaddr addr;
|
---|
864 | #if 0
|
---|
865 | struct sockaddr_in host_addr;
|
---|
866 | #endif
|
---|
867 | caddr_t buf = 0;
|
---|
868 | int mlen;
|
---|
869 |
|
---|
870 | LogFlowFunc(("sosendto: so = %R[natsock], m = %p\n", so, m));
|
---|
871 |
|
---|
872 | memset(&addr, 0, sizeof(struct sockaddr));
|
---|
873 | #ifdef RT_OS_DARWIN
|
---|
874 | addr.sa_len = sizeof(struct sockaddr_in);
|
---|
875 | #endif
|
---|
876 | paddr = (struct sockaddr_in *)&addr;
|
---|
877 | paddr->sin_family = AF_INET;
|
---|
878 | if ((so->so_faddr.s_addr & RT_H2N_U32(pData->netmask)) == pData->special_addr.s_addr)
|
---|
879 | {
|
---|
880 | /* It's an alias */
|
---|
881 | uint32_t last_byte = RT_N2H_U32(so->so_faddr.s_addr) & ~pData->netmask;
|
---|
882 | switch(last_byte)
|
---|
883 | {
|
---|
884 | #if 0
|
---|
885 | /* handle this case at 'default:' */
|
---|
886 | case CTL_BROADCAST:
|
---|
887 | addr.sin_addr.s_addr = INADDR_BROADCAST;
|
---|
888 | /* Send the packet to host to fully emulate broadcast */
|
---|
889 | /** @todo r=klaus: on Linux host this causes the host to receive
|
---|
890 | * the packet twice for some reason. And I cannot find any place
|
---|
891 | * in the man pages which states that sending a broadcast does not
|
---|
892 | * reach the host itself. */
|
---|
893 | host_addr.sin_family = AF_INET;
|
---|
894 | host_addr.sin_port = so->so_fport;
|
---|
895 | host_addr.sin_addr = our_addr;
|
---|
896 | sendto(so->s, m->m_data, m->m_len, 0,
|
---|
897 | (struct sockaddr *)&host_addr, sizeof (struct sockaddr));
|
---|
898 | break;
|
---|
899 | #endif
|
---|
900 | case CTL_DNS:
|
---|
901 | case CTL_ALIAS:
|
---|
902 | default:
|
---|
903 | if (last_byte == ~pData->netmask)
|
---|
904 | paddr->sin_addr.s_addr = INADDR_BROADCAST;
|
---|
905 | else
|
---|
906 | paddr->sin_addr = loopback_addr;
|
---|
907 | break;
|
---|
908 | }
|
---|
909 | }
|
---|
910 | else
|
---|
911 | paddr->sin_addr = so->so_faddr;
|
---|
912 | paddr->sin_port = so->so_fport;
|
---|
913 |
|
---|
914 | Log2((" sendto()ing, addr.sin_port=%d, addr.sin_addr.s_addr=%.16s\n",
|
---|
915 | RT_N2H_U16(paddr->sin_port), inet_ntoa(paddr->sin_addr)));
|
---|
916 |
|
---|
917 | /* Don't care what port we get */
|
---|
918 | /*
|
---|
919 | * > nmap -sV -T4 -O -A -v -PU3483 255.255.255.255
|
---|
920 | * generates bodyless messages, annoying memmory management system.
|
---|
921 | */
|
---|
922 | mlen = m_length(m, NULL);
|
---|
923 | if (mlen > 0)
|
---|
924 | {
|
---|
925 | buf = RTMemAlloc(mlen);
|
---|
926 | if (buf == NULL)
|
---|
927 | {
|
---|
928 | return -1;
|
---|
929 | }
|
---|
930 | m_copydata(m, 0, mlen, buf);
|
---|
931 | }
|
---|
932 | ret = sendto(so->s, buf, mlen, 0,
|
---|
933 | (struct sockaddr *)&addr, sizeof (struct sockaddr));
|
---|
934 | #ifdef VBOX_WITH_NAT_SEND2HOME
|
---|
935 | if (slirpIsWideCasting(pData, so->so_faddr.s_addr))
|
---|
936 | {
|
---|
937 | slirpSend2Home(pData, so, buf, mlen, 0);
|
---|
938 | }
|
---|
939 | #endif
|
---|
940 | if (buf)
|
---|
941 | RTMemFree(buf);
|
---|
942 | if (ret < 0)
|
---|
943 | {
|
---|
944 | Log2(("UDP: sendto fails (%s)\n", strerror(errno)));
|
---|
945 | return -1;
|
---|
946 | }
|
---|
947 |
|
---|
948 | /*
|
---|
949 | * Kill the socket if there's no reply in 4 minutes,
|
---|
950 | * but only if it's an expirable socket
|
---|
951 | */
|
---|
952 | if (so->so_expire)
|
---|
953 | so->so_expire = curtime + SO_EXPIRE;
|
---|
954 | so->so_state = SS_ISFCONNECTED; /* So that it gets select()ed */
|
---|
955 | return 0;
|
---|
956 | }
|
---|
957 |
|
---|
958 | /*
|
---|
959 | * XXX This should really be tcp_listen
|
---|
960 | */
|
---|
961 | struct socket *
|
---|
962 | solisten(PNATState pData, u_int32_t bind_addr, u_int port, u_int32_t laddr, u_int lport, int flags)
|
---|
963 | {
|
---|
964 | struct sockaddr_in addr;
|
---|
965 | struct socket *so;
|
---|
966 | socklen_t addrlen = sizeof(addr);
|
---|
967 | int s, opt = 1;
|
---|
968 | int status;
|
---|
969 |
|
---|
970 | LogFlowFunc(("solisten: port = %d, laddr = %x, lport = %d, flags = %x\n", port, laddr, lport, flags));
|
---|
971 |
|
---|
972 | if ((so = socreate()) == NULL)
|
---|
973 | {
|
---|
974 | /* RTMemFree(so); Not sofree() ??? free(NULL) == NOP */
|
---|
975 | return NULL;
|
---|
976 | }
|
---|
977 |
|
---|
978 | /* Don't tcp_attach... we don't need so_snd nor so_rcv */
|
---|
979 | if ((so->so_tcpcb = tcp_newtcpcb(pData, so)) == NULL)
|
---|
980 | {
|
---|
981 | RTMemFree(so);
|
---|
982 | return NULL;
|
---|
983 | }
|
---|
984 |
|
---|
985 | SOCKET_LOCK_CREATE(so);
|
---|
986 | SOCKET_LOCK(so);
|
---|
987 | QSOCKET_LOCK(tcb);
|
---|
988 | insque(pData, so,&tcb);
|
---|
989 | NSOCK_INC();
|
---|
990 | QSOCKET_UNLOCK(tcb);
|
---|
991 |
|
---|
992 | /*
|
---|
993 | * SS_FACCEPTONCE sockets must time out.
|
---|
994 | */
|
---|
995 | if (flags & SS_FACCEPTONCE)
|
---|
996 | so->so_tcpcb->t_timer[TCPT_KEEP] = TCPTV_KEEP_INIT*2;
|
---|
997 |
|
---|
998 | so->so_state = (SS_FACCEPTCONN|flags);
|
---|
999 | so->so_lport = lport; /* Kept in network format */
|
---|
1000 | so->so_laddr.s_addr = laddr; /* Ditto */
|
---|
1001 |
|
---|
1002 | memset(&addr, 0, sizeof(addr));
|
---|
1003 | #ifdef RT_OS_DARWIN
|
---|
1004 | addr.sin_len = sizeof(addr);
|
---|
1005 | #endif
|
---|
1006 | addr.sin_family = AF_INET;
|
---|
1007 | addr.sin_addr.s_addr = bind_addr;
|
---|
1008 | addr.sin_port = port;
|
---|
1009 |
|
---|
1010 | /**
|
---|
1011 | * changing listen(,1->SOMAXCONN) shouldn't be harmful for NAT's TCP/IP stack,
|
---|
1012 | * kernel will choose the optimal value for requests queue length.
|
---|
1013 | * @note: MSDN recommends low (2-4) values for bluetooth networking devices.
|
---|
1014 | */
|
---|
1015 | if ( ((s = socket(AF_INET, SOCK_STREAM, 0)) < 0)
|
---|
1016 | || (setsockopt(s, SOL_SOCKET, SO_REUSEADDR,(char *)&opt, sizeof(int)) < 0)
|
---|
1017 | || (bind(s,(struct sockaddr *)&addr, sizeof(addr)) < 0)
|
---|
1018 | || (listen(s, pData->soMaxConn) < 0))
|
---|
1019 | {
|
---|
1020 | #ifdef RT_OS_WINDOWS
|
---|
1021 | int tmperrno = WSAGetLastError(); /* Don't clobber the real reason we failed */
|
---|
1022 | closesocket(s);
|
---|
1023 | QSOCKET_LOCK(tcb);
|
---|
1024 | sofree(pData, so);
|
---|
1025 | QSOCKET_UNLOCK(tcb);
|
---|
1026 | /* Restore the real errno */
|
---|
1027 | WSASetLastError(tmperrno);
|
---|
1028 | #else
|
---|
1029 | int tmperrno = errno; /* Don't clobber the real reason we failed */
|
---|
1030 | close(s);
|
---|
1031 | if (sototcpcb(so))
|
---|
1032 | tcp_close(pData, sototcpcb(so));
|
---|
1033 | else
|
---|
1034 | sofree(pData, so);
|
---|
1035 | /* Restore the real errno */
|
---|
1036 | errno = tmperrno;
|
---|
1037 | #endif
|
---|
1038 | return NULL;
|
---|
1039 | }
|
---|
1040 | fd_nonblock(s);
|
---|
1041 | setsockopt(s, SOL_SOCKET, SO_OOBINLINE,(char *)&opt, sizeof(int));
|
---|
1042 |
|
---|
1043 | getsockname(s,(struct sockaddr *)&addr,&addrlen);
|
---|
1044 | so->so_fport = addr.sin_port;
|
---|
1045 | /* set socket buffers */
|
---|
1046 | opt = pData->socket_rcv;
|
---|
1047 | status = setsockopt(s, SOL_SOCKET, SO_RCVBUF, (char *)&opt, sizeof(int));
|
---|
1048 | if (status < 0)
|
---|
1049 | {
|
---|
1050 | LogRel(("NAT: Error(%d) while setting RCV capacity to (%d)\n", errno, opt));
|
---|
1051 | goto no_sockopt;
|
---|
1052 | }
|
---|
1053 | opt = pData->socket_snd;
|
---|
1054 | status = setsockopt(s, SOL_SOCKET, SO_SNDBUF, (char *)&opt, sizeof(int));
|
---|
1055 | if (status < 0)
|
---|
1056 | {
|
---|
1057 | LogRel(("NAT: Error(%d) while setting SND capacity to (%d)\n", errno, opt));
|
---|
1058 | goto no_sockopt;
|
---|
1059 | }
|
---|
1060 | no_sockopt:
|
---|
1061 | if (addr.sin_addr.s_addr == 0 || addr.sin_addr.s_addr == loopback_addr.s_addr)
|
---|
1062 | so->so_faddr = alias_addr;
|
---|
1063 | else
|
---|
1064 | so->so_faddr = addr.sin_addr;
|
---|
1065 |
|
---|
1066 | so->s = s;
|
---|
1067 | SOCKET_UNLOCK(so);
|
---|
1068 | return so;
|
---|
1069 | }
|
---|
1070 |
|
---|
1071 | /*
|
---|
1072 | * Data is available in so_rcv
|
---|
1073 | * Just write() the data to the socket
|
---|
1074 | * XXX not yet...
|
---|
1075 | * @todo do we really need this function, what it's intended to do?
|
---|
1076 | */
|
---|
1077 | void
|
---|
1078 | sorwakeup(struct socket *so)
|
---|
1079 | {
|
---|
1080 | NOREF(so);
|
---|
1081 | #if 0
|
---|
1082 | sowrite(so);
|
---|
1083 | FD_CLR(so->s,&writefds);
|
---|
1084 | #endif
|
---|
1085 | }
|
---|
1086 |
|
---|
1087 | /*
|
---|
1088 | * Data has been freed in so_snd
|
---|
1089 | * We have room for a read() if we want to
|
---|
1090 | * For now, don't read, it'll be done in the main loop
|
---|
1091 | */
|
---|
1092 | void
|
---|
1093 | sowwakeup(struct socket *so)
|
---|
1094 | {
|
---|
1095 | NOREF(so);
|
---|
1096 | }
|
---|
1097 |
|
---|
1098 | /*
|
---|
1099 | * Various session state calls
|
---|
1100 | * XXX Should be #define's
|
---|
1101 | * The socket state stuff needs work, these often get call 2 or 3
|
---|
1102 | * times each when only 1 was needed
|
---|
1103 | */
|
---|
1104 | void
|
---|
1105 | soisfconnecting(struct socket *so)
|
---|
1106 | {
|
---|
1107 | so->so_state &= ~(SS_NOFDREF|SS_ISFCONNECTED|SS_FCANTRCVMORE|
|
---|
1108 | SS_FCANTSENDMORE|SS_FWDRAIN);
|
---|
1109 | so->so_state |= SS_ISFCONNECTING; /* Clobber other states */
|
---|
1110 | }
|
---|
1111 |
|
---|
1112 | void
|
---|
1113 | soisfconnected(struct socket *so)
|
---|
1114 | {
|
---|
1115 | LogFlowFunc(("ENTER: so:%R[natsock]\n", so));
|
---|
1116 | so->so_state &= ~(SS_ISFCONNECTING|SS_FWDRAIN|SS_NOFDREF);
|
---|
1117 | so->so_state |= SS_ISFCONNECTED; /* Clobber other states */
|
---|
1118 | LogFlowFunc(("LEAVE: so:%R[natsock]\n", so));
|
---|
1119 | }
|
---|
1120 |
|
---|
1121 | int
|
---|
1122 | sofcantrcvmore(struct socket *so)
|
---|
1123 | {
|
---|
1124 | int err = 0;
|
---|
1125 |
|
---|
1126 | LogFlowFunc(("ENTER: so:%R[natsock]\n", so));
|
---|
1127 | if ((so->so_state & SS_NOFDREF) == 0)
|
---|
1128 | {
|
---|
1129 | /*
|
---|
1130 | * If remote closes first and then sends an RST, the recv() in
|
---|
1131 | * soread() will keep reporting EOF without any error
|
---|
1132 | * indication. As far as I can tell the only way to detect
|
---|
1133 | * this on Linux is to check if shutdown() succeeds here (but
|
---|
1134 | * see below).
|
---|
1135 | *
|
---|
1136 | * OTOH on OS X shutdown() "helpfully" checks if remote has
|
---|
1137 | * already closed and then always returns ENOTCONN
|
---|
1138 | * immediately.
|
---|
1139 | */
|
---|
1140 | int status = shutdown(so->s, SHUT_RD);
|
---|
1141 | #if defined(RT_OS_LINUX)
|
---|
1142 | if (status < 0)
|
---|
1143 | err = errno;
|
---|
1144 | #else
|
---|
1145 | RT_NOREF(status);
|
---|
1146 | #endif
|
---|
1147 | }
|
---|
1148 | so->so_state &= ~(SS_ISFCONNECTING);
|
---|
1149 | if (so->so_state & SS_FCANTSENDMORE)
|
---|
1150 | {
|
---|
1151 | #if defined(RT_OS_LINUX)
|
---|
1152 | /*
|
---|
1153 | * If we have closed first, and remote closes, shutdown will
|
---|
1154 | * return ENOTCONN, but this is expected. Don't tell the
|
---|
1155 | * caller there was an error.
|
---|
1156 | */
|
---|
1157 | if (err == ENOTCONN)
|
---|
1158 | err = 0;
|
---|
1159 | #endif
|
---|
1160 | so->so_state = SS_NOFDREF; /* Don't select it */
|
---|
1161 | /* XXX close() here as well? */
|
---|
1162 | }
|
---|
1163 | else
|
---|
1164 | so->so_state |= SS_FCANTRCVMORE;
|
---|
1165 |
|
---|
1166 | LogFlowFunc(("LEAVE: %d\n", err));
|
---|
1167 | return err;
|
---|
1168 | }
|
---|
1169 |
|
---|
1170 | void
|
---|
1171 | sofcantsendmore(struct socket *so)
|
---|
1172 | {
|
---|
1173 | LogFlowFunc(("ENTER: so:%R[natsock]\n", so));
|
---|
1174 | if ((so->so_state & SS_NOFDREF) == 0)
|
---|
1175 | shutdown(so->s, 1); /* send FIN to fhost */
|
---|
1176 |
|
---|
1177 | so->so_state &= ~(SS_ISFCONNECTING);
|
---|
1178 | if (so->so_state & SS_FCANTRCVMORE)
|
---|
1179 | so->so_state = SS_NOFDREF; /* as above */
|
---|
1180 | else
|
---|
1181 | so->so_state |= SS_FCANTSENDMORE;
|
---|
1182 | LogFlowFuncLeave();
|
---|
1183 | }
|
---|
1184 |
|
---|
1185 | void
|
---|
1186 | soisfdisconnected(struct socket *so)
|
---|
1187 | {
|
---|
1188 | NOREF(so);
|
---|
1189 | #if 0
|
---|
1190 | so->so_state &= ~(SS_ISFCONNECTING|SS_ISFCONNECTED);
|
---|
1191 | close(so->s);
|
---|
1192 | so->so_state = SS_ISFDISCONNECTED;
|
---|
1193 | /*
|
---|
1194 | * XXX Do nothing ... ?
|
---|
1195 | */
|
---|
1196 | #endif
|
---|
1197 | }
|
---|
1198 |
|
---|
1199 | /*
|
---|
1200 | * Set write drain mode
|
---|
1201 | * Set CANTSENDMORE once all data has been write()n
|
---|
1202 | */
|
---|
1203 | void
|
---|
1204 | sofwdrain(struct socket *so)
|
---|
1205 | {
|
---|
1206 | if (SBUF_LEN(&so->so_rcv))
|
---|
1207 | so->so_state |= SS_FWDRAIN;
|
---|
1208 | else
|
---|
1209 | sofcantsendmore(so);
|
---|
1210 | }
|
---|
1211 |
|
---|
1212 | #if !defined(RT_OS_WINDOWS)
|
---|
1213 | static void
|
---|
1214 | send_icmp_to_guest(PNATState pData, char *buff, size_t len, const struct sockaddr_in *addr)
|
---|
1215 | {
|
---|
1216 | struct ip *ip;
|
---|
1217 | uint32_t dst, src;
|
---|
1218 | char ip_copy[256];
|
---|
1219 | struct icmp *icp;
|
---|
1220 | int old_ip_len = 0;
|
---|
1221 | int hlen, original_hlen = 0;
|
---|
1222 | struct mbuf *m;
|
---|
1223 | struct icmp_msg *icm;
|
---|
1224 | uint8_t proto;
|
---|
1225 | int type = 0;
|
---|
1226 |
|
---|
1227 | ip = (struct ip *)buff;
|
---|
1228 | /* Fix ip->ip_len to contain the total packet length including the header
|
---|
1229 | * in _host_ byte order for all OSes. On Darwin, that value already is in
|
---|
1230 | * host byte order. Solaris and Darwin report only the payload. */
|
---|
1231 | #ifndef RT_OS_DARWIN
|
---|
1232 | ip->ip_len = RT_N2H_U16(ip->ip_len);
|
---|
1233 | #endif
|
---|
1234 | hlen = (ip->ip_hl << 2);
|
---|
1235 | #if defined(RT_OS_SOLARIS) || defined(RT_OS_DARWIN)
|
---|
1236 | ip->ip_len += hlen;
|
---|
1237 | #endif
|
---|
1238 | if (ip->ip_len < hlen + ICMP_MINLEN)
|
---|
1239 | {
|
---|
1240 | Log(("send_icmp_to_guest: ICMP header is too small to understand which type/subtype of the datagram\n"));
|
---|
1241 | return;
|
---|
1242 | }
|
---|
1243 | icp = (struct icmp *)((char *)ip + hlen);
|
---|
1244 |
|
---|
1245 | Log(("ICMP:received msg(t:%d, c:%d)\n", icp->icmp_type, icp->icmp_code));
|
---|
1246 | if ( icp->icmp_type != ICMP_ECHOREPLY
|
---|
1247 | && icp->icmp_type != ICMP_TIMXCEED
|
---|
1248 | && icp->icmp_type != ICMP_UNREACH)
|
---|
1249 | {
|
---|
1250 | return;
|
---|
1251 | }
|
---|
1252 |
|
---|
1253 | /*
|
---|
1254 | * ICMP_ECHOREPLY, ICMP_TIMXCEED, ICMP_UNREACH minimal header size is
|
---|
1255 | * ICMP_ECHOREPLY assuming data 0
|
---|
1256 | * icmp_{type(8), code(8), cksum(16),identifier(16),seqnum(16)}
|
---|
1257 | */
|
---|
1258 | if (ip->ip_len < hlen + 8)
|
---|
1259 | {
|
---|
1260 | Log(("send_icmp_to_guest: NAT accept ICMP_{ECHOREPLY, TIMXCEED, UNREACH} the minimum size is 64 (see rfc792)\n"));
|
---|
1261 | return;
|
---|
1262 | }
|
---|
1263 |
|
---|
1264 | type = icp->icmp_type;
|
---|
1265 | if ( type == ICMP_TIMXCEED
|
---|
1266 | || type == ICMP_UNREACH)
|
---|
1267 | {
|
---|
1268 | /*
|
---|
1269 | * ICMP_TIMXCEED, ICMP_UNREACH minimal header size is
|
---|
1270 | * icmp_{type(8), code(8), cksum(16),unused(32)} + IP header + 64 bit of original datagram
|
---|
1271 | */
|
---|
1272 | if (ip->ip_len < hlen + 2*8 + sizeof(struct ip))
|
---|
1273 | {
|
---|
1274 | Log(("send_icmp_to_guest: NAT accept ICMP_{TIMXCEED, UNREACH} the minimum size of ipheader + 64 bit of data (see rfc792)\n"));
|
---|
1275 | return;
|
---|
1276 | }
|
---|
1277 | ip = &icp->icmp_ip;
|
---|
1278 | }
|
---|
1279 |
|
---|
1280 | icm = icmp_find_original_mbuf(pData, ip);
|
---|
1281 | if (icm == NULL)
|
---|
1282 | {
|
---|
1283 | Log(("NAT: Can't find the corresponding packet for the received ICMP\n"));
|
---|
1284 | return;
|
---|
1285 | }
|
---|
1286 |
|
---|
1287 | m = icm->im_m;
|
---|
1288 | if (!m)
|
---|
1289 | {
|
---|
1290 | LogFunc(("%R[natsock] hasn't stored it's mbuf on sent\n", icm->im_so));
|
---|
1291 | goto done;
|
---|
1292 | }
|
---|
1293 |
|
---|
1294 | src = addr->sin_addr.s_addr;
|
---|
1295 | if (type == ICMP_ECHOREPLY)
|
---|
1296 | {
|
---|
1297 | struct ip *ip0 = mtod(m, struct ip *);
|
---|
1298 | struct icmp *icp0 = (struct icmp *)((char *)ip0 + (ip0->ip_hl << 2));
|
---|
1299 | if (icp0->icmp_type != ICMP_ECHO)
|
---|
1300 | {
|
---|
1301 | Log(("NAT: we haven't found echo for this reply\n"));
|
---|
1302 | goto done;
|
---|
1303 | }
|
---|
1304 | /*
|
---|
1305 | * while combining buffer to send (see ip_icmp.c) we control ICMP header only,
|
---|
1306 | * IP header combined by OS network stack, our local copy of IP header contians values
|
---|
1307 | * in host byte order so no byte order conversion is required. IP headers fields are converting
|
---|
1308 | * in ip_output0 routine only.
|
---|
1309 | */
|
---|
1310 | if ( (ip->ip_len - hlen)
|
---|
1311 | != (ip0->ip_len - (ip0->ip_hl << 2)))
|
---|
1312 | {
|
---|
1313 | Log(("NAT: ECHO(%d) lenght doesn't match ECHOREPLY(%d)\n",
|
---|
1314 | (ip->ip_len - hlen), (ip0->ip_len - (ip0->ip_hl << 2))));
|
---|
1315 | goto done;
|
---|
1316 | }
|
---|
1317 | }
|
---|
1318 |
|
---|
1319 | /* ip points on origianal ip header */
|
---|
1320 | ip = mtod(m, struct ip *);
|
---|
1321 | proto = ip->ip_p;
|
---|
1322 | /* Now ip is pointing on header we've sent from guest */
|
---|
1323 | if ( icp->icmp_type == ICMP_TIMXCEED
|
---|
1324 | || icp->icmp_type == ICMP_UNREACH)
|
---|
1325 | {
|
---|
1326 | old_ip_len = (ip->ip_hl << 2) + 64;
|
---|
1327 | if (old_ip_len > sizeof(ip_copy))
|
---|
1328 | old_ip_len = sizeof(ip_copy);
|
---|
1329 | memcpy(ip_copy, ip, old_ip_len);
|
---|
1330 | }
|
---|
1331 |
|
---|
1332 | /* source address from original IP packet*/
|
---|
1333 | dst = ip->ip_src.s_addr;
|
---|
1334 |
|
---|
1335 | /* overide ther tail of old packet */
|
---|
1336 | ip = mtod(m, struct ip *); /* ip is from mbuf we've overrided */
|
---|
1337 | original_hlen = ip->ip_hl << 2;
|
---|
1338 | /* saves original ip header and options */
|
---|
1339 | m_copyback(pData, m, original_hlen, len - hlen, buff + hlen);
|
---|
1340 | ip->ip_len = m_length(m, NULL);
|
---|
1341 | ip->ip_p = IPPROTO_ICMP; /* the original package could be whatever, but we're response via ICMP*/
|
---|
1342 |
|
---|
1343 | icp = (struct icmp *)((char *)ip + (ip->ip_hl << 2));
|
---|
1344 | type = icp->icmp_type;
|
---|
1345 | if ( type == ICMP_TIMXCEED
|
---|
1346 | || type == ICMP_UNREACH)
|
---|
1347 | {
|
---|
1348 | /* according RFC 793 error messages required copy of initial IP header + 64 bit */
|
---|
1349 | memcpy(&icp->icmp_ip, ip_copy, old_ip_len);
|
---|
1350 |
|
---|
1351 | /* undo byte order conversions done in ip_input() */
|
---|
1352 | HTONS(icp->icmp_ip.ip_len);
|
---|
1353 | HTONS(icp->icmp_ip.ip_id);
|
---|
1354 | HTONS(icp->icmp_ip.ip_off);
|
---|
1355 |
|
---|
1356 | ip->ip_tos = ((ip->ip_tos & 0x1E) | 0xC0); /* high priority for errors */
|
---|
1357 | }
|
---|
1358 |
|
---|
1359 | ip->ip_src.s_addr = src;
|
---|
1360 | ip->ip_dst.s_addr = dst;
|
---|
1361 | icmp_reflect(pData, m);
|
---|
1362 | /* m was freed */
|
---|
1363 | icm->im_m = NULL;
|
---|
1364 |
|
---|
1365 | done:
|
---|
1366 | icmp_msg_delete(pData, icm);
|
---|
1367 | }
|
---|
1368 |
|
---|
1369 | static void sorecvfrom_icmp_unix(PNATState pData, struct socket *so)
|
---|
1370 | {
|
---|
1371 | struct sockaddr_in addr;
|
---|
1372 | socklen_t addrlen = sizeof(struct sockaddr_in);
|
---|
1373 | struct ip ip;
|
---|
1374 | char *buff;
|
---|
1375 | int len = 0;
|
---|
1376 |
|
---|
1377 | /* 1- step: read the ip header */
|
---|
1378 | len = recvfrom(so->s, &ip, sizeof(struct ip), MSG_PEEK,
|
---|
1379 | (struct sockaddr *)&addr, &addrlen);
|
---|
1380 | if ( len < 0
|
---|
1381 | && ( soIgnorableErrorCode(errno)
|
---|
1382 | || errno == ENOTCONN))
|
---|
1383 | {
|
---|
1384 | Log(("sorecvfrom_icmp_unix: 1 - step can't read IP datagramm (would block)\n"));
|
---|
1385 | return;
|
---|
1386 | }
|
---|
1387 |
|
---|
1388 | if ( len < sizeof(struct ip)
|
---|
1389 | || len < 0
|
---|
1390 | || len == 0)
|
---|
1391 | {
|
---|
1392 | u_char code;
|
---|
1393 | code = ICMP_UNREACH_PORT;
|
---|
1394 |
|
---|
1395 | if (errno == EHOSTUNREACH)
|
---|
1396 | code = ICMP_UNREACH_HOST;
|
---|
1397 | else if (errno == ENETUNREACH)
|
---|
1398 | code = ICMP_UNREACH_NET;
|
---|
1399 |
|
---|
1400 | LogRel(("NAT: UDP ICMP rx errno=%d (%s)\n", errno, strerror(errno)));
|
---|
1401 | icmp_error(pData, so->so_m, ICMP_UNREACH, code, 0, strerror(errno));
|
---|
1402 | so->so_m = NULL;
|
---|
1403 | Log(("sorecvfrom_icmp_unix: 1 - step can't read IP datagramm\n"));
|
---|
1404 | return;
|
---|
1405 | }
|
---|
1406 | /* basic check of IP header */
|
---|
1407 | if ( ip.ip_v != IPVERSION
|
---|
1408 | # ifndef RT_OS_DARWIN
|
---|
1409 | || ip.ip_p != IPPROTO_ICMP
|
---|
1410 | # endif
|
---|
1411 | )
|
---|
1412 | {
|
---|
1413 | Log(("sorecvfrom_icmp_unix: 1 - step IP isn't IPv4\n"));
|
---|
1414 | return;
|
---|
1415 | }
|
---|
1416 | # ifndef RT_OS_DARWIN
|
---|
1417 | /* Darwin reports the IP length already in host byte order. */
|
---|
1418 | ip.ip_len = RT_N2H_U16(ip.ip_len);
|
---|
1419 | # endif
|
---|
1420 | # if defined(RT_OS_SOLARIS) || defined(RT_OS_DARWIN)
|
---|
1421 | /* Solaris and Darwin report the payload only */
|
---|
1422 | ip.ip_len += (ip.ip_hl << 2);
|
---|
1423 | # endif
|
---|
1424 | /* Note: ip->ip_len in host byte order (all OS) */
|
---|
1425 | len = ip.ip_len;
|
---|
1426 | buff = RTMemAlloc(len);
|
---|
1427 | if (buff == NULL)
|
---|
1428 | {
|
---|
1429 | Log(("sorecvfrom_icmp_unix: 1 - step can't allocate enought room for datagram\n"));
|
---|
1430 | return;
|
---|
1431 | }
|
---|
1432 | /* 2 - step: we're reading rest of the datagramm to the buffer */
|
---|
1433 | addrlen = sizeof(struct sockaddr_in);
|
---|
1434 | memset(&addr, 0, addrlen);
|
---|
1435 | len = recvfrom(so->s, buff, len, 0,
|
---|
1436 | (struct sockaddr *)&addr, &addrlen);
|
---|
1437 | if ( len < 0
|
---|
1438 | && ( soIgnorableErrorCode(errno)
|
---|
1439 | || errno == ENOTCONN))
|
---|
1440 | {
|
---|
1441 | Log(("sorecvfrom_icmp_unix: 2 - step can't read IP body (would block expected:%d)\n",
|
---|
1442 | ip.ip_len));
|
---|
1443 | RTMemFree(buff);
|
---|
1444 | return;
|
---|
1445 | }
|
---|
1446 | if ( len < 0
|
---|
1447 | || len == 0)
|
---|
1448 | {
|
---|
1449 | Log(("sorecvfrom_icmp_unix: 2 - step read of the rest of datagramm is fallen (errno:%d, len:%d expected: %d)\n",
|
---|
1450 | errno, len, (ip.ip_len - sizeof(struct ip))));
|
---|
1451 | RTMemFree(buff);
|
---|
1452 | return;
|
---|
1453 | }
|
---|
1454 | /* len is modified in 2nd read, when the rest of the datagramm was read */
|
---|
1455 | send_icmp_to_guest(pData, buff, len, &addr);
|
---|
1456 | RTMemFree(buff);
|
---|
1457 | }
|
---|
1458 | #endif /* !RT_OS_WINDOWS */
|
---|