1 | #include <machine/rtems-bsd-kernel-space.h> |
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2 | |
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3 | /*- |
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4 | * Copyright (c) 1982, 1986, 1993 |
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5 | * The Regents of the University of California. All rights reserved. |
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6 | * |
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7 | * Redistribution and use in source and binary forms, with or without |
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8 | * modification, are permitted provided that the following conditions |
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9 | * are met: |
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10 | * 1. Redistributions of source code must retain the above copyright |
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11 | * notice, this list of conditions and the following disclaimer. |
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12 | * 2. Redistributions in binary form must reproduce the above copyright |
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13 | * notice, this list of conditions and the following disclaimer in the |
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14 | * documentation and/or other materials provided with the distribution. |
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15 | * 3. Neither the name of the University nor the names of its contributors |
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16 | * may be used to endorse or promote products derived from this software |
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17 | * without specific prior written permission. |
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18 | * |
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19 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
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20 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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21 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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22 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
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23 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
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24 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
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25 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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26 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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27 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
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28 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
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29 | * SUCH DAMAGE. |
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30 | * |
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31 | * From: @(#)if_loop.c 8.1 (Berkeley) 6/10/93 |
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32 | * $FreeBSD$ |
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33 | */ |
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34 | |
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35 | /* |
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36 | * Discard interface driver for protocol testing and timing. |
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37 | * (Based on the loopback.) |
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38 | */ |
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39 | |
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40 | #include <sys/param.h> |
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41 | #include <sys/systm.h> |
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42 | #include <sys/kernel.h> |
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43 | #include <sys/malloc.h> |
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44 | #include <sys/module.h> |
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45 | #include <sys/mbuf.h> |
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46 | #include <sys/socket.h> |
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47 | #include <sys/sockio.h> |
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48 | |
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49 | #include <net/if.h> |
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50 | #include <net/if_var.h> |
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51 | #include <net/if_clone.h> |
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52 | #include <net/if_types.h> |
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53 | #include <net/route.h> |
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54 | #include <net/bpf.h> |
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55 | #include <net/vnet.h> |
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56 | |
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57 | #include <rtems/bsd/local/opt_inet.h> |
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58 | #include <rtems/bsd/local/opt_inet6.h> |
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59 | |
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60 | #ifdef TINY_DSMTU |
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61 | #define DSMTU (1024+512) |
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62 | #else |
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63 | #define DSMTU 65532 |
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64 | #endif |
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65 | |
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66 | struct disc_softc { |
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67 | struct ifnet *sc_ifp; |
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68 | }; |
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69 | |
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70 | static int discoutput(struct ifnet *, struct mbuf *, |
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71 | const struct sockaddr *, struct route *); |
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72 | static int discioctl(struct ifnet *, u_long, caddr_t); |
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73 | static int disc_clone_create(struct if_clone *, int, caddr_t); |
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74 | static void disc_clone_destroy(struct ifnet *); |
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75 | |
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76 | static const char discname[] = "disc"; |
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77 | static MALLOC_DEFINE(M_DISC, discname, "Discard interface"); |
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78 | |
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79 | static VNET_DEFINE(struct if_clone *, disc_cloner); |
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80 | #define V_disc_cloner VNET(disc_cloner) |
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81 | |
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82 | static int |
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83 | disc_clone_create(struct if_clone *ifc, int unit, caddr_t params) |
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84 | { |
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85 | struct ifnet *ifp; |
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86 | struct disc_softc *sc; |
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87 | |
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88 | sc = malloc(sizeof(struct disc_softc), M_DISC, M_WAITOK | M_ZERO); |
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89 | ifp = sc->sc_ifp = if_alloc(IFT_LOOP); |
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90 | if (ifp == NULL) { |
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91 | free(sc, M_DISC); |
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92 | return (ENOSPC); |
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93 | } |
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94 | |
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95 | ifp->if_softc = sc; |
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96 | if_initname(ifp, discname, unit); |
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97 | ifp->if_mtu = DSMTU; |
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98 | /* |
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99 | * IFF_LOOPBACK should not be removed from disc's flags because |
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100 | * it controls what PF-specific routes are magically added when |
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101 | * a network address is assigned to the interface. Things just |
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102 | * won't work as intended w/o such routes because the output |
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103 | * interface selection for a packet is totally route-driven. |
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104 | * A valid alternative to IFF_LOOPBACK can be IFF_BROADCAST or |
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105 | * IFF_POINTOPOINT, but it would result in different properties |
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106 | * of the interface. |
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107 | */ |
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108 | ifp->if_flags = IFF_LOOPBACK | IFF_MULTICAST; |
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109 | ifp->if_drv_flags = IFF_DRV_RUNNING; |
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110 | ifp->if_ioctl = discioctl; |
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111 | ifp->if_output = discoutput; |
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112 | ifp->if_hdrlen = 0; |
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113 | ifp->if_addrlen = 0; |
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114 | ifp->if_snd.ifq_maxlen = 20; |
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115 | if_attach(ifp); |
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116 | bpfattach(ifp, DLT_NULL, sizeof(u_int32_t)); |
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117 | |
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118 | return (0); |
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119 | } |
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120 | |
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121 | static void |
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122 | disc_clone_destroy(struct ifnet *ifp) |
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123 | { |
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124 | struct disc_softc *sc; |
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125 | |
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126 | sc = ifp->if_softc; |
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127 | |
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128 | bpfdetach(ifp); |
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129 | if_detach(ifp); |
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130 | if_free(ifp); |
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131 | |
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132 | free(sc, M_DISC); |
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133 | } |
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134 | |
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135 | static void |
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136 | vnet_disc_init(const void *unused __unused) |
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137 | { |
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138 | |
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139 | V_disc_cloner = if_clone_simple(discname, disc_clone_create, |
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140 | disc_clone_destroy, 0); |
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141 | } |
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142 | VNET_SYSINIT(vnet_disc_init, SI_SUB_PSEUDO, SI_ORDER_ANY, |
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143 | vnet_disc_init, NULL); |
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144 | |
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145 | static void |
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146 | vnet_disc_uninit(const void *unused __unused) |
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147 | { |
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148 | |
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149 | if_clone_detach(V_disc_cloner); |
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150 | } |
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151 | VNET_SYSUNINIT(vnet_disc_uninit, SI_SUB_INIT_IF, SI_ORDER_ANY, |
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152 | vnet_disc_uninit, NULL); |
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153 | |
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154 | static int |
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155 | disc_modevent(module_t mod, int type, void *data) |
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156 | { |
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157 | |
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158 | switch (type) { |
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159 | case MOD_LOAD: |
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160 | case MOD_UNLOAD: |
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161 | break; |
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162 | default: |
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163 | return (EOPNOTSUPP); |
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164 | } |
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165 | return (0); |
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166 | } |
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167 | |
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168 | static moduledata_t disc_mod = { |
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169 | "if_disc", |
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170 | disc_modevent, |
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171 | NULL |
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172 | }; |
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173 | |
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174 | DECLARE_MODULE(if_disc, disc_mod, SI_SUB_PSEUDO, SI_ORDER_ANY); |
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175 | |
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176 | static int |
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177 | discoutput(struct ifnet *ifp, struct mbuf *m, const struct sockaddr *dst, |
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178 | struct route *ro) |
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179 | { |
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180 | u_int32_t af; |
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181 | |
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182 | M_ASSERTPKTHDR(m); |
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183 | |
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184 | /* BPF writes need to be handled specially. */ |
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185 | if (dst->sa_family == AF_UNSPEC) |
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186 | bcopy(dst->sa_data, &af, sizeof(af)); |
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187 | else |
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188 | af = dst->sa_family; |
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189 | |
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190 | if (bpf_peers_present(ifp->if_bpf)) |
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191 | bpf_mtap2(ifp->if_bpf, &af, sizeof(af), m); |
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192 | |
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193 | m->m_pkthdr.rcvif = ifp; |
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194 | |
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195 | if_inc_counter(ifp, IFCOUNTER_OPACKETS, 1); |
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196 | if_inc_counter(ifp, IFCOUNTER_OBYTES, m->m_pkthdr.len); |
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197 | |
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198 | m_freem(m); |
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199 | return (0); |
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200 | } |
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201 | |
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202 | /* |
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203 | * Process an ioctl request. |
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204 | */ |
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205 | static int |
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206 | discioctl(struct ifnet *ifp, u_long cmd, caddr_t data) |
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207 | { |
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208 | struct ifreq *ifr = (struct ifreq *)data; |
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209 | int error = 0; |
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210 | |
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211 | switch (cmd) { |
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212 | case SIOCSIFADDR: |
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213 | ifp->if_flags |= IFF_UP; |
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214 | |
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215 | /* |
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216 | * Everything else is done at a higher level. |
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217 | */ |
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218 | break; |
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219 | case SIOCADDMULTI: |
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220 | case SIOCDELMULTI: |
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221 | if (ifr == NULL) { |
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222 | error = EAFNOSUPPORT; /* XXX */ |
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223 | break; |
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224 | } |
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225 | switch (ifr->ifr_addr.sa_family) { |
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226 | #ifdef INET |
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227 | case AF_INET: |
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228 | break; |
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229 | #endif |
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230 | #ifdef INET6 |
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231 | case AF_INET6: |
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232 | break; |
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233 | #endif |
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234 | default: |
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235 | error = EAFNOSUPPORT; |
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236 | break; |
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237 | } |
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238 | break; |
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239 | case SIOCSIFMTU: |
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240 | ifp->if_mtu = ifr->ifr_mtu; |
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241 | break; |
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242 | default: |
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243 | error = EINVAL; |
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244 | } |
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245 | return (error); |
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246 | } |
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