1 | /* |
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2 | * Copyright (c) 1982, 1986, 1988, 1990, 1993 |
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3 | * The Regents of the University of California. All rights reserved. |
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4 | * |
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5 | * Redistribution and use in source and binary forms, with or without |
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6 | * modification, are permitted provided that the following conditions |
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7 | * are met: |
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8 | * 1. Redistributions of source code must retain the above copyright |
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9 | * notice, this list of conditions and the following disclaimer. |
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10 | * 2. Redistributions in binary form must reproduce the above copyright |
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11 | * notice, this list of conditions and the following disclaimer in the |
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12 | * documentation and/or other materials provided with the distribution. |
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13 | * 3. All advertising materials mentioning features or use of this software |
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14 | * must display the following acknowledgement: |
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15 | * This product includes software developed by the University of |
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16 | * California, Berkeley and its contributors. |
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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 | * @(#)uipc_socket.c 8.3 (Berkeley) 4/15/94 |
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34 | * $Id$ |
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35 | */ |
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36 | |
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37 | #include <sys/param.h> |
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38 | #include <sys/queue.h> |
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39 | #include <sys/systm.h> |
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40 | #include <sys/proc.h> |
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41 | #include <sys/file.h> |
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42 | #include <sys/malloc.h> |
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43 | #include <sys/mbuf.h> |
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44 | #include <sys/domain.h> |
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45 | #include <sys/kernel.h> |
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46 | #include <sys/protosw.h> |
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47 | #include <sys/socket.h> |
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48 | #include <sys/socketvar.h> |
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49 | #include <sys/resourcevar.h> |
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50 | #include <sys/signalvar.h> |
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51 | #include <sys/sysctl.h> |
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52 | #include <limits.h> |
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53 | |
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54 | static int somaxconn = SOMAXCONN; |
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55 | SYSCTL_INT(_kern, KERN_SOMAXCONN, somaxconn, CTLFLAG_RW, &somaxconn, 0, ""); |
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56 | |
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57 | /* |
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58 | * Socket operation routines. |
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59 | * These routines are called by the routines in |
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60 | * sys_socket.c or from a system process, and |
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61 | * implement the semantics of socket operations by |
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62 | * switching out to the protocol specific routines. |
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63 | */ |
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64 | /*ARGSUSED*/ |
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65 | int |
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66 | socreate(dom, aso, type, proto, p) |
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67 | int dom; |
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68 | struct socket **aso; |
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69 | register int type; |
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70 | int proto; |
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71 | struct proc *p; |
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72 | { |
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73 | register struct protosw *prp; |
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74 | register struct socket *so; |
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75 | register int error; |
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76 | |
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77 | if (proto) |
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78 | prp = pffindproto(dom, proto, type); |
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79 | else |
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80 | prp = pffindtype(dom, type); |
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81 | if (prp == 0 || prp->pr_usrreqs == 0) |
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82 | return (EPROTONOSUPPORT); |
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83 | if (prp->pr_type != type) |
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84 | return (EPROTOTYPE); |
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85 | MALLOC(so, struct socket *, sizeof(*so), M_SOCKET, M_WAIT); |
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86 | bzero((caddr_t)so, sizeof(*so)); |
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87 | TAILQ_INIT(&so->so_incomp); |
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88 | TAILQ_INIT(&so->so_comp); |
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89 | so->so_type = type; |
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90 | so->so_state = SS_PRIV; |
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91 | so->so_uid = 0; |
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92 | so->so_proto = prp; |
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93 | error = (*prp->pr_usrreqs->pru_attach)(so, proto); |
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94 | if (error) { |
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95 | so->so_state |= SS_NOFDREF; |
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96 | sofree(so); |
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97 | return (error); |
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98 | } |
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99 | *aso = so; |
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100 | return (0); |
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101 | } |
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102 | |
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103 | int |
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104 | sobind(so, nam) |
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105 | struct socket *so; |
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106 | struct mbuf *nam; |
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107 | { |
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108 | int s = splnet(); |
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109 | int error; |
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110 | |
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111 | error = (*so->so_proto->pr_usrreqs->pru_bind)(so, nam); |
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112 | splx(s); |
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113 | return (error); |
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114 | } |
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115 | |
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116 | int |
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117 | solisten(so, backlog) |
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118 | register struct socket *so; |
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119 | int backlog; |
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120 | { |
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121 | int s = splnet(), error; |
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122 | |
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123 | error = (*so->so_proto->pr_usrreqs->pru_listen)(so); |
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124 | if (error) { |
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125 | splx(s); |
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126 | return (error); |
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127 | } |
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128 | if (so->so_comp.tqh_first == NULL) |
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129 | so->so_options |= SO_ACCEPTCONN; |
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130 | if (backlog < 0 || backlog > somaxconn) |
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131 | backlog = somaxconn; |
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132 | so->so_qlimit = backlog; |
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133 | splx(s); |
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134 | return (0); |
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135 | } |
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136 | |
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137 | void |
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138 | sofree(so) |
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139 | register struct socket *so; |
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140 | { |
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141 | struct socket *head = so->so_head; |
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142 | |
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143 | if (so->so_pcb || (so->so_state & SS_NOFDREF) == 0) |
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144 | return; |
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145 | if (head != NULL) { |
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146 | if (so->so_state & SS_INCOMP) { |
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147 | TAILQ_REMOVE(&head->so_incomp, so, so_list); |
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148 | head->so_incqlen--; |
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149 | } else if (so->so_state & SS_COMP) { |
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150 | TAILQ_REMOVE(&head->so_comp, so, so_list); |
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151 | } else { |
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152 | panic("sofree: not queued"); |
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153 | } |
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154 | head->so_qlen--; |
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155 | so->so_state &= ~(SS_INCOMP|SS_COMP); |
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156 | so->so_head = NULL; |
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157 | } |
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158 | sbrelease(&so->so_snd); |
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159 | sorflush(so); |
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160 | FREE(so, M_SOCKET); |
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161 | } |
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162 | |
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163 | /* |
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164 | * Close a socket on last file table reference removal. |
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165 | * Initiate disconnect if connected. |
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166 | * Free socket when disconnect complete. |
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167 | */ |
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168 | int |
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169 | soclose(so) |
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170 | register struct socket *so; |
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171 | { |
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172 | int s = splnet(); /* conservative */ |
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173 | int error = 0; |
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174 | |
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175 | if (so->so_options & SO_ACCEPTCONN) { |
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176 | struct socket *sp, *sonext; |
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177 | |
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178 | for (sp = so->so_incomp.tqh_first; sp != NULL; sp = sonext) { |
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179 | sonext = sp->so_list.tqe_next; |
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180 | (void) soabort(sp); |
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181 | } |
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182 | for (sp = so->so_comp.tqh_first; sp != NULL; sp = sonext) { |
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183 | sonext = sp->so_list.tqe_next; |
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184 | (void) soabort(sp); |
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185 | } |
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186 | } |
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187 | if (so->so_pcb == 0) |
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188 | goto discard; |
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189 | if (so->so_state & SS_ISCONNECTED) { |
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190 | if ((so->so_state & SS_ISDISCONNECTING) == 0) { |
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191 | error = sodisconnect(so); |
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192 | if (error) |
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193 | goto drop; |
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194 | } |
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195 | if (so->so_options & SO_LINGER) { |
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196 | if ((so->so_state & SS_ISDISCONNECTING) && |
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197 | (so->so_state & SS_NBIO)) |
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198 | goto drop; |
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199 | while (so->so_state & SS_ISCONNECTED) { |
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200 | soconnsleep (so); |
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201 | } |
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202 | } |
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203 | } |
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204 | drop: |
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205 | if (so->so_pcb) { |
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206 | int error2 = (*so->so_proto->pr_usrreqs->pru_detach)(so); |
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207 | if (error == 0) |
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208 | error = error2; |
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209 | } |
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210 | discard: |
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211 | if (so->so_state & SS_NOFDREF) |
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212 | panic("soclose: NOFDREF"); |
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213 | so->so_state |= SS_NOFDREF; |
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214 | sofree(so); |
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215 | splx(s); |
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216 | return (error); |
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217 | } |
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218 | |
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219 | /* |
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220 | * Must be called at splnet... |
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221 | */ |
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222 | int |
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223 | soabort(so) |
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224 | struct socket *so; |
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225 | { |
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226 | |
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227 | return (*so->so_proto->pr_usrreqs->pru_abort)(so); |
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228 | } |
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229 | |
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230 | int |
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231 | soaccept(so, nam) |
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232 | register struct socket *so; |
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233 | struct mbuf *nam; |
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234 | { |
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235 | int s = splnet(); |
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236 | int error; |
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237 | |
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238 | if ((so->so_state & SS_NOFDREF) == 0) |
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239 | panic("soaccept: !NOFDREF"); |
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240 | so->so_state &= ~SS_NOFDREF; |
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241 | error = (*so->so_proto->pr_usrreqs->pru_accept)(so, nam); |
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242 | splx(s); |
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243 | return (error); |
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244 | } |
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245 | |
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246 | int |
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247 | soconnect(so, nam) |
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248 | register struct socket *so; |
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249 | struct mbuf *nam; |
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250 | { |
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251 | int s; |
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252 | int error; |
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253 | |
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254 | if (so->so_options & SO_ACCEPTCONN) |
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255 | return (EOPNOTSUPP); |
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256 | s = splnet(); |
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257 | /* |
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258 | * If protocol is connection-based, can only connect once. |
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259 | * Otherwise, if connected, try to disconnect first. |
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260 | * This allows user to disconnect by connecting to, e.g., |
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261 | * a null address. |
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262 | */ |
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263 | if (so->so_state & (SS_ISCONNECTED|SS_ISCONNECTING) && |
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264 | ((so->so_proto->pr_flags & PR_CONNREQUIRED) || |
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265 | (error = sodisconnect(so)))) |
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266 | error = EISCONN; |
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267 | else |
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268 | error = (*so->so_proto->pr_usrreqs->pru_connect)(so, nam); |
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269 | splx(s); |
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270 | return (error); |
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271 | } |
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272 | |
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273 | int |
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274 | soconnect2(so1, so2) |
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275 | register struct socket *so1; |
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276 | struct socket *so2; |
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277 | { |
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278 | int s = splnet(); |
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279 | int error; |
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280 | |
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281 | error = (*so1->so_proto->pr_usrreqs->pru_connect2)(so1, so2); |
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282 | splx(s); |
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283 | return (error); |
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284 | } |
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285 | |
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286 | int |
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287 | sodisconnect(so) |
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288 | register struct socket *so; |
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289 | { |
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290 | int s = splnet(); |
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291 | int error; |
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292 | |
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293 | if ((so->so_state & SS_ISCONNECTED) == 0) { |
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294 | error = ENOTCONN; |
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295 | goto bad; |
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296 | } |
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297 | if (so->so_state & SS_ISDISCONNECTING) { |
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298 | error = EALREADY; |
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299 | goto bad; |
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300 | } |
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301 | error = (*so->so_proto->pr_usrreqs->pru_disconnect)(so); |
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302 | bad: |
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303 | splx(s); |
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304 | return (error); |
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305 | } |
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306 | |
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307 | #define SBLOCKWAIT(f) (((f) & MSG_DONTWAIT) ? M_NOWAIT : M_WAITOK) |
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308 | /* |
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309 | * Send on a socket. |
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310 | * If send must go all at once and message is larger than |
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311 | * send buffering, then hard error. |
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312 | * Lock against other senders. |
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313 | * If must go all at once and not enough room now, then |
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314 | * inform user that this would block and do nothing. |
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315 | * Otherwise, if nonblocking, send as much as possible. |
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316 | * The data to be sent is described by "uio" if nonzero, |
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317 | * otherwise by the mbuf chain "top" (which must be null |
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318 | * if uio is not). Data provided in mbuf chain must be small |
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319 | * enough to send all at once. |
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320 | * |
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321 | * Returns nonzero on error, timeout or signal; callers |
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322 | * must check for short counts if EINTR/ERESTART are returned. |
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323 | * Data and control buffers are freed on return. |
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324 | */ |
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325 | int |
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326 | sosend(so, addr, uio, top, control, flags) |
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327 | register struct socket *so; |
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328 | struct mbuf *addr; |
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329 | struct uio *uio; |
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330 | struct mbuf *top; |
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331 | struct mbuf *control; |
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332 | int flags; |
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333 | { |
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334 | struct mbuf **mp; |
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335 | register struct mbuf *m; |
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336 | register long space, len, resid; |
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337 | int clen = 0, error, s, dontroute, mlen; |
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338 | int atomic = sosendallatonce(so) || top; |
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339 | |
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340 | if (uio) |
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341 | resid = uio->uio_resid; |
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342 | else |
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343 | resid = top->m_pkthdr.len; |
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344 | /* |
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345 | * In theory resid should be unsigned. |
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346 | * However, space must be signed, as it might be less than 0 |
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347 | * if we over-committed, and we must use a signed comparison |
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348 | * of space and resid. On the other hand, a negative resid |
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349 | * causes us to loop sending 0-length segments to the protocol. |
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350 | * |
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351 | * Also check to make sure that MSG_EOR isn't used on SOCK_STREAM |
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352 | * type sockets since that's an error. |
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353 | */ |
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354 | if ((resid < 0) || (so->so_type == SOCK_STREAM && (flags & MSG_EOR))) { |
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355 | error = EINVAL; |
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356 | goto out; |
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357 | } |
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358 | |
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359 | dontroute = |
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360 | (flags & MSG_DONTROUTE) && (so->so_options & SO_DONTROUTE) == 0 && |
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361 | (so->so_proto->pr_flags & PR_ATOMIC); |
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362 | if (control) |
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363 | clen = control->m_len; |
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364 | #define snderr(errno) { error = errno; splx(s); goto release; } |
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365 | |
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366 | restart: |
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367 | error = sblock(&so->so_snd, SBLOCKWAIT(flags)); |
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368 | if (error) |
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369 | goto out; |
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370 | do { |
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371 | s = splnet(); |
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372 | if (so->so_state & SS_CANTSENDMORE) |
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373 | snderr(EPIPE); |
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374 | if (so->so_error) { |
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375 | error = so->so_error; |
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376 | so->so_error = 0; |
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377 | splx(s); |
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378 | goto release; |
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379 | } |
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380 | if ((so->so_state & SS_ISCONNECTED) == 0) { |
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381 | /* |
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382 | * `sendto' and `sendmsg' is allowed on a connection- |
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383 | * based socket if it supports implied connect. |
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384 | * Return ENOTCONN if not connected and no address is |
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385 | * supplied. |
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386 | */ |
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387 | if ((so->so_proto->pr_flags & PR_CONNREQUIRED) && |
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388 | (so->so_proto->pr_flags & PR_IMPLOPCL) == 0) { |
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389 | if ((so->so_state & SS_ISCONFIRMING) == 0 && |
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390 | !(resid == 0 && clen != 0)) |
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391 | snderr(ENOTCONN); |
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392 | } else if (addr == 0) |
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393 | snderr(so->so_proto->pr_flags & PR_CONNREQUIRED ? |
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394 | ENOTCONN : EDESTADDRREQ); |
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395 | } |
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396 | space = sbspace(&so->so_snd); |
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397 | if (flags & MSG_OOB) |
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398 | space += 1024; |
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399 | if ((atomic && resid > so->so_snd.sb_hiwat) || |
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400 | clen > so->so_snd.sb_hiwat) |
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401 | snderr(EMSGSIZE); |
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402 | if (space < resid + clen && uio && |
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403 | (atomic || space < so->so_snd.sb_lowat || space < clen)) { |
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404 | if (so->so_state & SS_NBIO) |
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405 | snderr(EWOULDBLOCK); |
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406 | sbunlock(&so->so_snd); |
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407 | error = sbwait(&so->so_snd); |
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408 | splx(s); |
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409 | if (error) |
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410 | goto out; |
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411 | goto restart; |
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412 | } |
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413 | splx(s); |
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414 | mp = ⊤ |
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415 | space -= clen; |
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416 | do { |
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417 | if (uio == NULL) { |
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418 | /* |
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419 | * Data is prepackaged in "top". |
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420 | */ |
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421 | resid = 0; |
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422 | if (flags & MSG_EOR) |
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423 | top->m_flags |= M_EOR; |
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424 | } else do { |
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425 | if (top == 0) { |
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426 | MGETHDR(m, M_WAIT, MT_DATA); |
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427 | mlen = MHLEN; |
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428 | m->m_pkthdr.len = 0; |
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429 | m->m_pkthdr.rcvif = (struct ifnet *)0; |
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430 | } else { |
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431 | MGET(m, M_WAIT, MT_DATA); |
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432 | mlen = MLEN; |
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433 | } |
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434 | if (resid >= MINCLSIZE) { |
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435 | MCLGET(m, M_WAIT); |
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436 | if ((m->m_flags & M_EXT) == 0) |
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437 | goto nopages; |
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438 | mlen = MCLBYTES; |
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439 | len = min(min(mlen, resid), space); |
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440 | } else { |
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441 | nopages: |
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442 | len = min(min(mlen, resid), space); |
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443 | /* |
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444 | * For datagram protocols, leave room |
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445 | * for protocol headers in first mbuf. |
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446 | */ |
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447 | if (atomic && top == 0 && len < mlen) |
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448 | MH_ALIGN(m, len); |
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449 | } |
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450 | space -= len; |
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451 | error = uiomove(mtod(m, caddr_t), (int)len, uio); |
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452 | resid = uio->uio_resid; |
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453 | m->m_len = len; |
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454 | *mp = m; |
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455 | top->m_pkthdr.len += len; |
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456 | if (error) |
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457 | goto release; |
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458 | mp = &m->m_next; |
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459 | if (resid <= 0) { |
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460 | if (flags & MSG_EOR) |
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461 | top->m_flags |= M_EOR; |
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462 | break; |
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463 | } |
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464 | } while (space > 0 && atomic); |
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465 | if (dontroute) |
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466 | so->so_options |= SO_DONTROUTE; |
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467 | s = splnet(); /* XXX */ |
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468 | error = (*so->so_proto->pr_usrreqs->pru_send)(so, |
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469 | (flags & MSG_OOB) ? PRUS_OOB : |
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470 | /* |
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471 | * If the user set MSG_EOF, the protocol |
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472 | * understands this flag and nothing left to |
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473 | * send then use PRU_SEND_EOF instead of PRU_SEND. |
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474 | */ |
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475 | ((flags & MSG_EOF) && |
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476 | (so->so_proto->pr_flags & PR_IMPLOPCL) && |
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477 | (resid <= 0)) ? |
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478 | PRUS_EOF : 0, |
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479 | top, addr, control); |
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480 | splx(s); |
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481 | if (dontroute) |
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482 | so->so_options &= ~SO_DONTROUTE; |
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483 | clen = 0; |
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484 | control = 0; |
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485 | top = 0; |
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486 | mp = ⊤ |
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487 | if (error) |
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488 | goto release; |
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489 | } while (resid && space > 0); |
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490 | } while (resid); |
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491 | |
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492 | release: |
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493 | sbunlock(&so->so_snd); |
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494 | out: |
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495 | if (top) |
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496 | m_freem(top); |
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497 | if (control) |
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498 | m_freem(control); |
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499 | return (error); |
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500 | } |
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501 | |
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502 | /* |
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503 | * Implement receive operations on a socket. |
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504 | * We depend on the way that records are added to the sockbuf |
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505 | * by sbappend*. In particular, each record (mbufs linked through m_next) |
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506 | * must begin with an address if the protocol so specifies, |
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507 | * followed by an optional mbuf or mbufs containing ancillary data, |
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508 | * and then zero or more mbufs of data. |
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509 | * In order to avoid blocking network interrupts for the entire time here, |
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510 | * we splx() while doing the actual copy to user space. |
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511 | * Although the sockbuf is locked, new data may still be appended, |
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512 | * and thus we must maintain consistency of the sockbuf during that time. |
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513 | * |
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514 | * The caller may receive the data as a single mbuf chain by supplying |
---|
515 | * an mbuf **mp0 for use in returning the chain. The uio is then used |
---|
516 | * only for the count in uio_resid. |
---|
517 | */ |
---|
518 | int |
---|
519 | soreceive(so, paddr, uio, mp0, controlp, flagsp) |
---|
520 | register struct socket *so; |
---|
521 | struct mbuf **paddr; |
---|
522 | struct uio *uio; |
---|
523 | struct mbuf **mp0; |
---|
524 | struct mbuf **controlp; |
---|
525 | int *flagsp; |
---|
526 | { |
---|
527 | register struct mbuf *m, **mp; |
---|
528 | register int flags, len, error, s, offset; |
---|
529 | struct protosw *pr = so->so_proto; |
---|
530 | struct mbuf *nextrecord; |
---|
531 | int moff, type = 0; |
---|
532 | int orig_resid = uio->uio_resid; |
---|
533 | |
---|
534 | mp = mp0; |
---|
535 | if (paddr) |
---|
536 | *paddr = 0; |
---|
537 | if (controlp) |
---|
538 | *controlp = 0; |
---|
539 | if (flagsp) |
---|
540 | flags = *flagsp &~ MSG_EOR; |
---|
541 | else |
---|
542 | flags = 0; |
---|
543 | if (flags & MSG_OOB) { |
---|
544 | m = m_get(M_WAIT, MT_DATA); |
---|
545 | error = (*pr->pr_usrreqs->pru_rcvoob)(so, m, flags & MSG_PEEK); |
---|
546 | if (error) |
---|
547 | goto bad; |
---|
548 | do { |
---|
549 | error = uiomove(mtod(m, caddr_t), |
---|
550 | (int) min(uio->uio_resid, m->m_len), uio); |
---|
551 | m = m_free(m); |
---|
552 | } while (uio->uio_resid && error == 0 && m); |
---|
553 | bad: |
---|
554 | if (m) |
---|
555 | m_freem(m); |
---|
556 | return (error); |
---|
557 | } |
---|
558 | if (mp) |
---|
559 | *mp = (struct mbuf *)0; |
---|
560 | if (so->so_state & SS_ISCONFIRMING && uio->uio_resid) |
---|
561 | (*pr->pr_usrreqs->pru_rcvd)(so, 0); |
---|
562 | |
---|
563 | restart: |
---|
564 | error = sblock(&so->so_rcv, SBLOCKWAIT(flags)); |
---|
565 | if (error) |
---|
566 | return (error); |
---|
567 | s = splnet(); |
---|
568 | |
---|
569 | m = so->so_rcv.sb_mb; |
---|
570 | /* |
---|
571 | * If we have less data than requested, block awaiting more |
---|
572 | * (subject to any timeout) if: |
---|
573 | * 1. the current count is less than the low water mark, or |
---|
574 | * 2. MSG_WAITALL is set, and it is possible to do the entire |
---|
575 | * receive operation at once if we block (resid <= hiwat). |
---|
576 | * 3. MSG_DONTWAIT is not set |
---|
577 | * If MSG_WAITALL is set but resid is larger than the receive buffer, |
---|
578 | * we have to do the receive in sections, and thus risk returning |
---|
579 | * a short count if a timeout or signal occurs after we start. |
---|
580 | */ |
---|
581 | if (m == 0 || (((flags & MSG_DONTWAIT) == 0 && |
---|
582 | so->so_rcv.sb_cc < uio->uio_resid) && |
---|
583 | (so->so_rcv.sb_cc < so->so_rcv.sb_lowat || |
---|
584 | ((flags & MSG_WAITALL) && uio->uio_resid <= so->so_rcv.sb_hiwat)) && |
---|
585 | m->m_nextpkt == 0 && (pr->pr_flags & PR_ATOMIC) == 0)) { |
---|
586 | #ifdef DIAGNOSTIC |
---|
587 | if (m == 0 && so->so_rcv.sb_cc) |
---|
588 | panic("receive 1"); |
---|
589 | #endif |
---|
590 | if (so->so_error) { |
---|
591 | if (m) |
---|
592 | goto dontblock; |
---|
593 | error = so->so_error; |
---|
594 | if ((flags & MSG_PEEK) == 0) |
---|
595 | so->so_error = 0; |
---|
596 | goto release; |
---|
597 | } |
---|
598 | if (so->so_state & SS_CANTRCVMORE) { |
---|
599 | if (m) |
---|
600 | goto dontblock; |
---|
601 | else |
---|
602 | goto release; |
---|
603 | } |
---|
604 | for (; m; m = m->m_next) |
---|
605 | if (m->m_type == MT_OOBDATA || (m->m_flags & M_EOR)) { |
---|
606 | m = so->so_rcv.sb_mb; |
---|
607 | goto dontblock; |
---|
608 | } |
---|
609 | if ((so->so_state & (SS_ISCONNECTED|SS_ISCONNECTING)) == 0 && |
---|
610 | (so->so_proto->pr_flags & PR_CONNREQUIRED)) { |
---|
611 | error = ENOTCONN; |
---|
612 | goto release; |
---|
613 | } |
---|
614 | if (uio->uio_resid == 0) |
---|
615 | goto release; |
---|
616 | if ((so->so_state & SS_NBIO) || (flags & MSG_DONTWAIT)) { |
---|
617 | error = EWOULDBLOCK; |
---|
618 | goto release; |
---|
619 | } |
---|
620 | sbunlock(&so->so_rcv); |
---|
621 | error = sbwait(&so->so_rcv); |
---|
622 | splx(s); |
---|
623 | if (error) |
---|
624 | return (error); |
---|
625 | goto restart; |
---|
626 | } |
---|
627 | dontblock: |
---|
628 | nextrecord = m->m_nextpkt; |
---|
629 | if (pr->pr_flags & PR_ADDR) { |
---|
630 | #ifdef DIAGNOSTIC |
---|
631 | if (m->m_type != MT_SONAME) |
---|
632 | panic("receive 1a"); |
---|
633 | #endif |
---|
634 | orig_resid = 0; |
---|
635 | if (flags & MSG_PEEK) { |
---|
636 | if (paddr) |
---|
637 | *paddr = m_copy(m, 0, m->m_len); |
---|
638 | m = m->m_next; |
---|
639 | } else { |
---|
640 | sbfree(&so->so_rcv, m); |
---|
641 | if (paddr) { |
---|
642 | *paddr = m; |
---|
643 | so->so_rcv.sb_mb = m->m_next; |
---|
644 | m->m_next = 0; |
---|
645 | m = so->so_rcv.sb_mb; |
---|
646 | } else { |
---|
647 | MFREE(m, so->so_rcv.sb_mb); |
---|
648 | m = so->so_rcv.sb_mb; |
---|
649 | } |
---|
650 | } |
---|
651 | } |
---|
652 | while (m && m->m_type == MT_CONTROL && error == 0) { |
---|
653 | if (flags & MSG_PEEK) { |
---|
654 | if (controlp) |
---|
655 | *controlp = m_copy(m, 0, m->m_len); |
---|
656 | m = m->m_next; |
---|
657 | } else { |
---|
658 | sbfree(&so->so_rcv, m); |
---|
659 | if (controlp) { |
---|
660 | if (pr->pr_domain->dom_externalize && |
---|
661 | mtod(m, struct cmsghdr *)->cmsg_type == |
---|
662 | SCM_RIGHTS) |
---|
663 | error = (*pr->pr_domain->dom_externalize)(m); |
---|
664 | *controlp = m; |
---|
665 | so->so_rcv.sb_mb = m->m_next; |
---|
666 | m->m_next = 0; |
---|
667 | m = so->so_rcv.sb_mb; |
---|
668 | } else { |
---|
669 | MFREE(m, so->so_rcv.sb_mb); |
---|
670 | m = so->so_rcv.sb_mb; |
---|
671 | } |
---|
672 | } |
---|
673 | if (controlp) { |
---|
674 | orig_resid = 0; |
---|
675 | controlp = &(*controlp)->m_next; |
---|
676 | } |
---|
677 | } |
---|
678 | if (m) { |
---|
679 | if ((flags & MSG_PEEK) == 0) |
---|
680 | m->m_nextpkt = nextrecord; |
---|
681 | type = m->m_type; |
---|
682 | if (type == MT_OOBDATA) |
---|
683 | flags |= MSG_OOB; |
---|
684 | } |
---|
685 | moff = 0; |
---|
686 | offset = 0; |
---|
687 | while (m && uio->uio_resid > 0 && error == 0) { |
---|
688 | if (m->m_type == MT_OOBDATA) { |
---|
689 | if (type != MT_OOBDATA) |
---|
690 | break; |
---|
691 | } else if (type == MT_OOBDATA) |
---|
692 | break; |
---|
693 | #ifdef DIAGNOSTIC |
---|
694 | else if (m->m_type != MT_DATA && m->m_type != MT_HEADER) |
---|
695 | panic("receive 3"); |
---|
696 | #endif |
---|
697 | so->so_state &= ~SS_RCVATMARK; |
---|
698 | len = uio->uio_resid; |
---|
699 | if (so->so_oobmark && len > so->so_oobmark - offset) |
---|
700 | len = so->so_oobmark - offset; |
---|
701 | if (len > m->m_len - moff) |
---|
702 | len = m->m_len - moff; |
---|
703 | /* |
---|
704 | * If mp is set, just pass back the mbufs. |
---|
705 | * Otherwise copy them out via the uio, then free. |
---|
706 | * Sockbuf must be consistent here (points to current mbuf, |
---|
707 | * it points to next record) when we drop priority; |
---|
708 | * we must note any additions to the sockbuf when we |
---|
709 | * block interrupts again. |
---|
710 | */ |
---|
711 | if (mp == 0) { |
---|
712 | splx(s); |
---|
713 | error = uiomove(mtod(m, caddr_t) + moff, (int)len, uio); |
---|
714 | s = splnet(); |
---|
715 | if (error) |
---|
716 | goto release; |
---|
717 | } else |
---|
718 | uio->uio_resid -= len; |
---|
719 | if (len == m->m_len - moff) { |
---|
720 | if (m->m_flags & M_EOR) |
---|
721 | flags |= MSG_EOR; |
---|
722 | if (flags & MSG_PEEK) { |
---|
723 | m = m->m_next; |
---|
724 | moff = 0; |
---|
725 | } else { |
---|
726 | nextrecord = m->m_nextpkt; |
---|
727 | sbfree(&so->so_rcv, m); |
---|
728 | if (mp) { |
---|
729 | *mp = m; |
---|
730 | mp = &m->m_next; |
---|
731 | so->so_rcv.sb_mb = m = m->m_next; |
---|
732 | *mp = (struct mbuf *)0; |
---|
733 | } else { |
---|
734 | MFREE(m, so->so_rcv.sb_mb); |
---|
735 | m = so->so_rcv.sb_mb; |
---|
736 | } |
---|
737 | if (m) |
---|
738 | m->m_nextpkt = nextrecord; |
---|
739 | } |
---|
740 | } else { |
---|
741 | if (flags & MSG_PEEK) |
---|
742 | moff += len; |
---|
743 | else { |
---|
744 | if (mp) |
---|
745 | *mp = m_copym(m, 0, len, M_WAIT); |
---|
746 | m->m_data += len; |
---|
747 | m->m_len -= len; |
---|
748 | so->so_rcv.sb_cc -= len; |
---|
749 | } |
---|
750 | } |
---|
751 | if (so->so_oobmark) { |
---|
752 | if ((flags & MSG_PEEK) == 0) { |
---|
753 | so->so_oobmark -= len; |
---|
754 | if (so->so_oobmark == 0) { |
---|
755 | so->so_state |= SS_RCVATMARK; |
---|
756 | break; |
---|
757 | } |
---|
758 | } else { |
---|
759 | offset += len; |
---|
760 | if (offset == so->so_oobmark) |
---|
761 | break; |
---|
762 | } |
---|
763 | } |
---|
764 | if (flags & MSG_EOR) |
---|
765 | break; |
---|
766 | /* |
---|
767 | * If the MSG_WAITALL flag is set (for non-atomic socket), |
---|
768 | * we must not quit until "uio->uio_resid == 0" or an error |
---|
769 | * termination. If a signal/timeout occurs, return |
---|
770 | * with a short count but without error. |
---|
771 | * Keep sockbuf locked against other readers. |
---|
772 | */ |
---|
773 | while (flags & MSG_WAITALL && m == 0 && uio->uio_resid > 0 && |
---|
774 | !sosendallatonce(so) && !nextrecord) { |
---|
775 | if (so->so_error || so->so_state & SS_CANTRCVMORE) |
---|
776 | break; |
---|
777 | error = sbwait(&so->so_rcv); |
---|
778 | if (error) { |
---|
779 | sbunlock(&so->so_rcv); |
---|
780 | splx(s); |
---|
781 | return (0); |
---|
782 | } |
---|
783 | m = so->so_rcv.sb_mb; |
---|
784 | if (m) |
---|
785 | nextrecord = m->m_nextpkt; |
---|
786 | } |
---|
787 | } |
---|
788 | |
---|
789 | if (m && pr->pr_flags & PR_ATOMIC) { |
---|
790 | flags |= MSG_TRUNC; |
---|
791 | if ((flags & MSG_PEEK) == 0) |
---|
792 | (void) sbdroprecord(&so->so_rcv); |
---|
793 | } |
---|
794 | if ((flags & MSG_PEEK) == 0) { |
---|
795 | if (m == 0) |
---|
796 | so->so_rcv.sb_mb = nextrecord; |
---|
797 | if (pr->pr_flags & PR_WANTRCVD && so->so_pcb) |
---|
798 | (*pr->pr_usrreqs->pru_rcvd)(so, flags); |
---|
799 | } |
---|
800 | if (orig_resid == uio->uio_resid && orig_resid && |
---|
801 | (flags & MSG_EOR) == 0 && (so->so_state & SS_CANTRCVMORE) == 0) { |
---|
802 | sbunlock(&so->so_rcv); |
---|
803 | splx(s); |
---|
804 | goto restart; |
---|
805 | } |
---|
806 | |
---|
807 | if (flagsp) |
---|
808 | *flagsp |= flags; |
---|
809 | release: |
---|
810 | sbunlock(&so->so_rcv); |
---|
811 | splx(s); |
---|
812 | return (error); |
---|
813 | } |
---|
814 | |
---|
815 | int |
---|
816 | soshutdown(so, how) |
---|
817 | register struct socket *so; |
---|
818 | register int how; |
---|
819 | { |
---|
820 | register struct protosw *pr = so->so_proto; |
---|
821 | |
---|
822 | how++; |
---|
823 | if (how & FREAD) |
---|
824 | sorflush(so); |
---|
825 | if (how & FWRITE) |
---|
826 | return ((*pr->pr_usrreqs->pru_shutdown)(so)); |
---|
827 | return (0); |
---|
828 | } |
---|
829 | |
---|
830 | void |
---|
831 | sorflush(so) |
---|
832 | register struct socket *so; |
---|
833 | { |
---|
834 | register struct sockbuf *sb = &so->so_rcv; |
---|
835 | register struct protosw *pr = so->so_proto; |
---|
836 | register int s; |
---|
837 | struct sockbuf asb; |
---|
838 | |
---|
839 | sb->sb_flags |= SB_NOINTR; |
---|
840 | (void) sblock(sb, M_WAITOK); |
---|
841 | s = splimp(); |
---|
842 | socantrcvmore(so); |
---|
843 | sbunlock(sb); |
---|
844 | asb = *sb; |
---|
845 | bzero((caddr_t)sb, sizeof (*sb)); |
---|
846 | splx(s); |
---|
847 | if (pr->pr_flags & PR_RIGHTS && pr->pr_domain->dom_dispose) |
---|
848 | (*pr->pr_domain->dom_dispose)(asb.sb_mb); |
---|
849 | sbrelease(&asb); |
---|
850 | } |
---|
851 | |
---|
852 | int |
---|
853 | sosetopt(so, level, optname, m0) |
---|
854 | register struct socket *so; |
---|
855 | int level, optname; |
---|
856 | struct mbuf *m0; |
---|
857 | { |
---|
858 | int error = 0; |
---|
859 | register struct mbuf *m = m0; |
---|
860 | |
---|
861 | if (level != SOL_SOCKET) { |
---|
862 | if (so->so_proto && so->so_proto->pr_ctloutput) |
---|
863 | return ((*so->so_proto->pr_ctloutput) |
---|
864 | (PRCO_SETOPT, so, level, optname, &m0)); |
---|
865 | error = ENOPROTOOPT; |
---|
866 | } else { |
---|
867 | switch (optname) { |
---|
868 | |
---|
869 | case SO_LINGER: |
---|
870 | if (m == NULL || m->m_len != sizeof (struct linger)) { |
---|
871 | error = EINVAL; |
---|
872 | goto bad; |
---|
873 | } |
---|
874 | so->so_linger = mtod(m, struct linger *)->l_linger; |
---|
875 | /* fall thru... */ |
---|
876 | |
---|
877 | case SO_DEBUG: |
---|
878 | case SO_KEEPALIVE: |
---|
879 | case SO_DONTROUTE: |
---|
880 | case SO_USELOOPBACK: |
---|
881 | case SO_BROADCAST: |
---|
882 | case SO_REUSEADDR: |
---|
883 | case SO_REUSEPORT: |
---|
884 | case SO_OOBINLINE: |
---|
885 | case SO_TIMESTAMP: |
---|
886 | if (m == NULL || m->m_len < sizeof (int)) { |
---|
887 | error = EINVAL; |
---|
888 | goto bad; |
---|
889 | } |
---|
890 | if (*mtod(m, int *)) |
---|
891 | so->so_options |= optname; |
---|
892 | else |
---|
893 | so->so_options &= ~optname; |
---|
894 | break; |
---|
895 | |
---|
896 | case SO_SNDBUF: |
---|
897 | case SO_RCVBUF: |
---|
898 | case SO_SNDLOWAT: |
---|
899 | case SO_RCVLOWAT: |
---|
900 | { |
---|
901 | int optval; |
---|
902 | |
---|
903 | if (m == NULL || m->m_len < sizeof (int)) { |
---|
904 | error = EINVAL; |
---|
905 | goto bad; |
---|
906 | } |
---|
907 | |
---|
908 | /* |
---|
909 | * Values < 1 make no sense for any of these |
---|
910 | * options, so disallow them. |
---|
911 | */ |
---|
912 | optval = *mtod(m, int *); |
---|
913 | if (optval < 1) { |
---|
914 | error = EINVAL; |
---|
915 | goto bad; |
---|
916 | } |
---|
917 | |
---|
918 | switch (optname) { |
---|
919 | |
---|
920 | case SO_SNDBUF: |
---|
921 | case SO_RCVBUF: |
---|
922 | if (sbreserve(optname == SO_SNDBUF ? |
---|
923 | &so->so_snd : &so->so_rcv, |
---|
924 | (u_long) optval) == 0) { |
---|
925 | error = ENOBUFS; |
---|
926 | goto bad; |
---|
927 | } |
---|
928 | break; |
---|
929 | |
---|
930 | /* |
---|
931 | * Make sure the low-water is never greater than |
---|
932 | * the high-water. |
---|
933 | */ |
---|
934 | case SO_SNDLOWAT: |
---|
935 | so->so_snd.sb_lowat = |
---|
936 | (optval > so->so_snd.sb_hiwat) ? |
---|
937 | so->so_snd.sb_hiwat : optval; |
---|
938 | break; |
---|
939 | case SO_RCVLOWAT: |
---|
940 | so->so_rcv.sb_lowat = |
---|
941 | (optval > so->so_rcv.sb_hiwat) ? |
---|
942 | so->so_rcv.sb_hiwat : optval; |
---|
943 | break; |
---|
944 | } |
---|
945 | break; |
---|
946 | } |
---|
947 | |
---|
948 | case SO_SNDTIMEO: |
---|
949 | case SO_RCVTIMEO: |
---|
950 | { |
---|
951 | struct timeval *tv; |
---|
952 | unsigned long val; |
---|
953 | |
---|
954 | if (m == NULL || m->m_len < sizeof (*tv)) { |
---|
955 | error = EINVAL; |
---|
956 | goto bad; |
---|
957 | } |
---|
958 | tv = mtod(m, struct timeval *); |
---|
959 | if (tv->tv_sec >= (ULONG_MAX - hz) / hz) { |
---|
960 | error = EDOM; |
---|
961 | goto bad; |
---|
962 | } |
---|
963 | val = tv->tv_sec * hz + tv->tv_usec / tick; |
---|
964 | if (val == 0) |
---|
965 | val = 1; |
---|
966 | |
---|
967 | switch (optname) { |
---|
968 | |
---|
969 | case SO_SNDTIMEO: |
---|
970 | so->so_snd.sb_timeo = val; |
---|
971 | break; |
---|
972 | case SO_RCVTIMEO: |
---|
973 | so->so_rcv.sb_timeo = val; |
---|
974 | break; |
---|
975 | } |
---|
976 | break; |
---|
977 | } |
---|
978 | |
---|
979 | case SO_PRIVSTATE: |
---|
980 | /* we don't care what the parameter is... */ |
---|
981 | so->so_state &= ~SS_PRIV; |
---|
982 | break; |
---|
983 | |
---|
984 | case SO_SNDWAKEUP: |
---|
985 | case SO_RCVWAKEUP: |
---|
986 | { |
---|
987 | /* RTEMS addition. */ |
---|
988 | struct sockwakeup *sw; |
---|
989 | struct sockbuf *sb; |
---|
990 | |
---|
991 | if (m == NULL |
---|
992 | || m->m_len != sizeof (struct sockwakeup)) { |
---|
993 | error = EINVAL; |
---|
994 | goto bad; |
---|
995 | } |
---|
996 | sw = mtod(m, struct sockwakeup *); |
---|
997 | sb = (optname == SO_SNDWAKEUP |
---|
998 | ? &so->so_snd |
---|
999 | : &so->so_rcv); |
---|
1000 | sb->sb_wakeup = sw->sw_pfn; |
---|
1001 | sb->sb_wakeuparg = sw->sw_arg; |
---|
1002 | if (sw->sw_pfn) |
---|
1003 | sb->sb_flags |= SB_ASYNC; |
---|
1004 | else |
---|
1005 | sb->sb_flags &=~ SB_ASYNC; |
---|
1006 | break; |
---|
1007 | } |
---|
1008 | |
---|
1009 | default: |
---|
1010 | error = ENOPROTOOPT; |
---|
1011 | break; |
---|
1012 | } |
---|
1013 | if (error == 0 && so->so_proto && so->so_proto->pr_ctloutput) { |
---|
1014 | (void) ((*so->so_proto->pr_ctloutput) |
---|
1015 | (PRCO_SETOPT, so, level, optname, &m0)); |
---|
1016 | m = NULL; /* freed by protocol */ |
---|
1017 | } |
---|
1018 | } |
---|
1019 | bad: |
---|
1020 | if (m) |
---|
1021 | (void) m_free(m); |
---|
1022 | return (error); |
---|
1023 | } |
---|
1024 | |
---|
1025 | int |
---|
1026 | sogetopt(so, level, optname, mp) |
---|
1027 | register struct socket *so; |
---|
1028 | int level, optname; |
---|
1029 | struct mbuf **mp; |
---|
1030 | { |
---|
1031 | register struct mbuf *m; |
---|
1032 | |
---|
1033 | if (level != SOL_SOCKET) { |
---|
1034 | if (so->so_proto && so->so_proto->pr_ctloutput) { |
---|
1035 | return ((*so->so_proto->pr_ctloutput) |
---|
1036 | (PRCO_GETOPT, so, level, optname, mp)); |
---|
1037 | } else |
---|
1038 | return (ENOPROTOOPT); |
---|
1039 | } else { |
---|
1040 | m = m_get(M_WAIT, MT_SOOPTS); |
---|
1041 | m->m_len = sizeof (int); |
---|
1042 | |
---|
1043 | switch (optname) { |
---|
1044 | |
---|
1045 | case SO_LINGER: |
---|
1046 | m->m_len = sizeof (struct linger); |
---|
1047 | mtod(m, struct linger *)->l_onoff = |
---|
1048 | so->so_options & SO_LINGER; |
---|
1049 | mtod(m, struct linger *)->l_linger = so->so_linger; |
---|
1050 | break; |
---|
1051 | |
---|
1052 | case SO_USELOOPBACK: |
---|
1053 | case SO_DONTROUTE: |
---|
1054 | case SO_DEBUG: |
---|
1055 | case SO_KEEPALIVE: |
---|
1056 | case SO_REUSEADDR: |
---|
1057 | case SO_REUSEPORT: |
---|
1058 | case SO_BROADCAST: |
---|
1059 | case SO_OOBINLINE: |
---|
1060 | case SO_TIMESTAMP: |
---|
1061 | *mtod(m, int *) = so->so_options & optname; |
---|
1062 | break; |
---|
1063 | |
---|
1064 | case SO_PRIVSTATE: |
---|
1065 | *mtod(m, int *) = so->so_state & SS_PRIV; |
---|
1066 | break; |
---|
1067 | |
---|
1068 | case SO_TYPE: |
---|
1069 | *mtod(m, int *) = so->so_type; |
---|
1070 | break; |
---|
1071 | |
---|
1072 | case SO_ERROR: |
---|
1073 | *mtod(m, int *) = so->so_error; |
---|
1074 | so->so_error = 0; |
---|
1075 | break; |
---|
1076 | |
---|
1077 | case SO_SNDBUF: |
---|
1078 | *mtod(m, int *) = so->so_snd.sb_hiwat; |
---|
1079 | break; |
---|
1080 | |
---|
1081 | case SO_RCVBUF: |
---|
1082 | *mtod(m, int *) = so->so_rcv.sb_hiwat; |
---|
1083 | break; |
---|
1084 | |
---|
1085 | case SO_SNDLOWAT: |
---|
1086 | *mtod(m, int *) = so->so_snd.sb_lowat; |
---|
1087 | break; |
---|
1088 | |
---|
1089 | case SO_RCVLOWAT: |
---|
1090 | *mtod(m, int *) = so->so_rcv.sb_lowat; |
---|
1091 | break; |
---|
1092 | |
---|
1093 | case SO_SNDTIMEO: |
---|
1094 | case SO_RCVTIMEO: |
---|
1095 | { |
---|
1096 | unsigned long val = (optname == SO_SNDTIMEO ? |
---|
1097 | so->so_snd.sb_timeo : so->so_rcv.sb_timeo); |
---|
1098 | |
---|
1099 | m->m_len = sizeof(struct timeval); |
---|
1100 | mtod(m, struct timeval *)->tv_sec = val / hz; |
---|
1101 | mtod(m, struct timeval *)->tv_usec = |
---|
1102 | (val % hz) * tick; |
---|
1103 | break; |
---|
1104 | } |
---|
1105 | |
---|
1106 | case SO_SNDWAKEUP: |
---|
1107 | case SO_RCVWAKEUP: |
---|
1108 | { |
---|
1109 | struct sockbuf *sb; |
---|
1110 | struct sockwakeup *sw; |
---|
1111 | |
---|
1112 | /* RTEMS additions. */ |
---|
1113 | sb = (optname == SO_SNDWAKEUP |
---|
1114 | ? &so->so_snd |
---|
1115 | : &so->so_rcv); |
---|
1116 | m->m_len = sizeof (struct sockwakeup); |
---|
1117 | sw = mtod(m, struct sockwakeup *); |
---|
1118 | sw->sw_pfn = sb->sb_wakeup; |
---|
1119 | sw->sw_arg = sb->sb_wakeuparg; |
---|
1120 | break; |
---|
1121 | } |
---|
1122 | |
---|
1123 | default: |
---|
1124 | (void)m_free(m); |
---|
1125 | return (ENOPROTOOPT); |
---|
1126 | } |
---|
1127 | *mp = m; |
---|
1128 | return (0); |
---|
1129 | } |
---|
1130 | } |
---|
1131 | |
---|
1132 | void |
---|
1133 | sohasoutofband(so) |
---|
1134 | register struct socket *so; |
---|
1135 | { |
---|
1136 | #if 0 /* FIXME: For now we just ignore out of band data */ |
---|
1137 | struct proc *p; |
---|
1138 | |
---|
1139 | if (so->so_pgid < 0) |
---|
1140 | gsignal(-so->so_pgid, SIGURG); |
---|
1141 | else if (so->so_pgid > 0 && (p = pfind(so->so_pgid)) != 0) |
---|
1142 | psignal(p, SIGURG); |
---|
1143 | selwakeup(&so->so_rcv.sb_sel); |
---|
1144 | #endif |
---|
1145 | } |
---|