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) 2002 Michael Shalayeff. All rights reserved. |
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5 | * Copyright (c) 2003 Ryan McBride. 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 | * |
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16 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
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17 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
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18 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
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19 | * IN NO EVENT SHALL THE AUTHOR OR HIS RELATIVES BE LIABLE FOR ANY DIRECT, |
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20 | * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES |
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21 | * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR |
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22 | * SERVICES; LOSS OF MIND, USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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23 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, |
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24 | * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING |
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25 | * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF |
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26 | * THE POSSIBILITY OF SUCH DAMAGE. |
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27 | */ |
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28 | |
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29 | #include <sys/cdefs.h> |
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30 | __FBSDID("$FreeBSD$"); |
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31 | |
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32 | #include <rtems/bsd/local/opt_bpf.h> |
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33 | #include <rtems/bsd/local/opt_inet.h> |
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34 | #include <rtems/bsd/local/opt_inet6.h> |
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35 | |
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36 | #include <rtems/bsd/sys/types.h> |
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37 | #include <rtems/bsd/sys/param.h> |
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38 | #include <sys/systm.h> |
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39 | #include <sys/conf.h> |
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40 | #include <sys/kernel.h> |
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41 | #include <sys/limits.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/module.h> |
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45 | #include <sys/time.h> |
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46 | #include <sys/priv.h> |
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47 | #include <sys/proc.h> |
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48 | #include <sys/protosw.h> |
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49 | #include <sys/sysctl.h> |
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50 | #include <sys/syslog.h> |
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51 | #include <sys/signalvar.h> |
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52 | #include <sys/filio.h> |
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53 | #include <sys/sockio.h> |
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54 | |
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55 | #include <sys/socket.h> |
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56 | #include <sys/vnode.h> |
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57 | |
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58 | #include <machine/stdarg.h> |
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59 | |
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60 | #include <net/bpf.h> |
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61 | #include <net/ethernet.h> |
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62 | #include <net/fddi.h> |
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63 | #include <net/iso88025.h> |
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64 | #include <net/if.h> |
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65 | #include <net/if_clone.h> |
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66 | #include <net/if_dl.h> |
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67 | #include <net/if_types.h> |
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68 | #include <net/route.h> |
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69 | #include <net/vnet.h> |
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70 | |
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71 | #if defined(INET) || defined(INET6) |
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72 | #include <netinet/in.h> |
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73 | #include <netinet/in_var.h> |
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74 | #include <netinet/ip_carp.h> |
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75 | #include <netinet/ip.h> |
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76 | |
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77 | #include <machine/in_cksum.h> |
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78 | #endif |
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79 | |
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80 | #ifdef INET |
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81 | #include <netinet/in_systm.h> |
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82 | #include <netinet/ip_var.h> |
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83 | #include <netinet/if_ether.h> |
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84 | #endif |
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85 | |
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86 | #ifdef INET6 |
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87 | #include <netinet/icmp6.h> |
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88 | #include <netinet/ip6.h> |
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89 | #include <netinet6/ip6protosw.h> |
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90 | #include <netinet6/ip6_var.h> |
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91 | #include <netinet6/scope6_var.h> |
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92 | #include <netinet6/in6_var.h> |
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93 | #include <netinet6/nd6.h> |
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94 | #endif |
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95 | |
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96 | #include <crypto/sha1.h> |
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97 | |
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98 | #define CARP_IFNAME "carp" |
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99 | static MALLOC_DEFINE(M_CARP, "CARP", "CARP interfaces"); |
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100 | SYSCTL_DECL(_net_inet_carp); |
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101 | |
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102 | struct carp_softc { |
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103 | struct ifnet *sc_ifp; /* Interface clue */ |
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104 | struct ifnet *sc_carpdev; /* Pointer to parent interface */ |
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105 | struct in_ifaddr *sc_ia; /* primary iface address */ |
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106 | #ifdef INET |
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107 | struct ip_moptions sc_imo; |
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108 | #endif |
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109 | #ifdef INET6 |
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110 | struct in6_ifaddr *sc_ia6; /* primary iface address v6 */ |
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111 | struct ip6_moptions sc_im6o; |
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112 | #endif /* INET6 */ |
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113 | TAILQ_ENTRY(carp_softc) sc_list; |
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114 | |
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115 | enum { INIT = 0, BACKUP, MASTER } sc_state; |
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116 | |
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117 | int sc_flags_backup; |
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118 | int sc_suppress; |
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119 | |
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120 | int sc_sendad_errors; |
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121 | #define CARP_SENDAD_MAX_ERRORS 3 |
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122 | int sc_sendad_success; |
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123 | #define CARP_SENDAD_MIN_SUCCESS 3 |
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124 | |
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125 | int sc_vhid; |
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126 | int sc_advskew; |
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127 | int sc_naddrs; |
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128 | int sc_naddrs6; |
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129 | int sc_advbase; /* seconds */ |
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130 | int sc_init_counter; |
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131 | u_int64_t sc_counter; |
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132 | |
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133 | /* authentication */ |
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134 | #define CARP_HMAC_PAD 64 |
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135 | unsigned char sc_key[CARP_KEY_LEN]; |
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136 | unsigned char sc_pad[CARP_HMAC_PAD]; |
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137 | SHA1_CTX sc_sha1; |
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138 | |
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139 | struct callout sc_ad_tmo; /* advertisement timeout */ |
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140 | struct callout sc_md_tmo; /* master down timeout */ |
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141 | struct callout sc_md6_tmo; /* master down timeout */ |
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142 | |
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143 | LIST_ENTRY(carp_softc) sc_next; /* Interface clue */ |
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144 | }; |
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145 | #define SC2IFP(sc) ((sc)->sc_ifp) |
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146 | |
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147 | int carp_suppress_preempt = 0; |
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148 | int carp_opts[CARPCTL_MAXID] = { 0, 1, 0, 1, 0, 0 }; /* XXX for now */ |
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149 | SYSCTL_NODE(_net_inet, IPPROTO_CARP, carp, CTLFLAG_RW, 0, "CARP"); |
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150 | SYSCTL_INT(_net_inet_carp, CARPCTL_ALLOW, allow, CTLFLAG_RW, |
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151 | &carp_opts[CARPCTL_ALLOW], 0, "Accept incoming CARP packets"); |
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152 | SYSCTL_INT(_net_inet_carp, CARPCTL_PREEMPT, preempt, CTLFLAG_RW, |
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153 | &carp_opts[CARPCTL_PREEMPT], 0, "high-priority backup preemption mode"); |
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154 | SYSCTL_INT(_net_inet_carp, CARPCTL_LOG, log, CTLFLAG_RW, |
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155 | &carp_opts[CARPCTL_LOG], 0, "log bad carp packets"); |
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156 | SYSCTL_INT(_net_inet_carp, CARPCTL_ARPBALANCE, arpbalance, CTLFLAG_RW, |
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157 | &carp_opts[CARPCTL_ARPBALANCE], 0, "balance arp responses"); |
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158 | SYSCTL_INT(_net_inet_carp, OID_AUTO, suppress_preempt, CTLFLAG_RD, |
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159 | &carp_suppress_preempt, 0, "Preemption is suppressed"); |
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160 | |
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161 | struct carpstats carpstats; |
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162 | SYSCTL_STRUCT(_net_inet_carp, CARPCTL_STATS, stats, CTLFLAG_RW, |
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163 | &carpstats, carpstats, |
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164 | "CARP statistics (struct carpstats, netinet/ip_carp.h)"); |
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165 | |
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166 | struct carp_if { |
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167 | TAILQ_HEAD(, carp_softc) vhif_vrs; |
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168 | int vhif_nvrs; |
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169 | |
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170 | struct ifnet *vhif_ifp; |
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171 | struct mtx vhif_mtx; |
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172 | }; |
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173 | |
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174 | #define CARP_INET 0 |
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175 | #define CARP_INET6 1 |
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176 | static int proto_reg[] = {-1, -1}; |
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177 | |
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178 | /* Get carp_if from softc. Valid after carp_set_addr{,6}. */ |
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179 | #define SC2CIF(sc) ((struct carp_if *)(sc)->sc_carpdev->if_carp) |
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180 | |
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181 | /* lock per carp_if queue */ |
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182 | #define CARP_LOCK_INIT(cif) mtx_init(&(cif)->vhif_mtx, "carp_if", \ |
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183 | NULL, MTX_DEF) |
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184 | #define CARP_LOCK_DESTROY(cif) mtx_destroy(&(cif)->vhif_mtx) |
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185 | #define CARP_LOCK_ASSERT(cif) mtx_assert(&(cif)->vhif_mtx, MA_OWNED) |
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186 | #define CARP_LOCK(cif) mtx_lock(&(cif)->vhif_mtx) |
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187 | #define CARP_UNLOCK(cif) mtx_unlock(&(cif)->vhif_mtx) |
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188 | |
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189 | #define CARP_SCLOCK(sc) mtx_lock(&SC2CIF(sc)->vhif_mtx) |
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190 | #define CARP_SCUNLOCK(sc) mtx_unlock(&SC2CIF(sc)->vhif_mtx) |
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191 | #define CARP_SCLOCK_ASSERT(sc) mtx_assert(&SC2CIF(sc)->vhif_mtx, MA_OWNED) |
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192 | |
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193 | #define CARP_LOG(...) do { \ |
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194 | if (carp_opts[CARPCTL_LOG] > 0) \ |
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195 | log(LOG_INFO, __VA_ARGS__); \ |
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196 | } while (0) |
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197 | |
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198 | #define CARP_DEBUG(...) do { \ |
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199 | if (carp_opts[CARPCTL_LOG] > 1) \ |
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200 | log(LOG_DEBUG, __VA_ARGS__); \ |
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201 | } while (0) |
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202 | |
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203 | static void carp_hmac_prepare(struct carp_softc *); |
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204 | static void carp_hmac_generate(struct carp_softc *, u_int32_t *, |
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205 | unsigned char *); |
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206 | static int carp_hmac_verify(struct carp_softc *, u_int32_t *, |
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207 | unsigned char *); |
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208 | static void carp_setroute(struct carp_softc *, int); |
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209 | static void carp_input_c(struct mbuf *, struct carp_header *, sa_family_t); |
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210 | static int carp_clone_create(struct if_clone *, int, caddr_t); |
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211 | static void carp_clone_destroy(struct ifnet *); |
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212 | static void carpdetach(struct carp_softc *, int); |
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213 | static int carp_prepare_ad(struct mbuf *, struct carp_softc *, |
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214 | struct carp_header *); |
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215 | static void carp_send_ad_all(void); |
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216 | static void carp_send_ad(void *); |
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217 | static void carp_send_ad_locked(struct carp_softc *); |
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218 | #ifdef INET |
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219 | static void carp_send_arp(struct carp_softc *); |
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220 | #endif |
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221 | static void carp_master_down(void *); |
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222 | static void carp_master_down_locked(struct carp_softc *); |
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223 | static int carp_ioctl(struct ifnet *, u_long, caddr_t); |
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224 | static int carp_looutput(struct ifnet *, struct mbuf *, struct sockaddr *, |
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225 | struct route *); |
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226 | static void carp_start(struct ifnet *); |
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227 | static void carp_setrun(struct carp_softc *, sa_family_t); |
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228 | static void carp_set_state(struct carp_softc *, int); |
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229 | #ifdef INET |
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230 | static int carp_addrcount(struct carp_if *, struct in_ifaddr *, int); |
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231 | #endif |
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232 | enum { CARP_COUNT_MASTER, CARP_COUNT_RUNNING }; |
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233 | |
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234 | #ifdef INET |
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235 | static void carp_multicast_cleanup(struct carp_softc *, int dofree); |
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236 | static int carp_set_addr(struct carp_softc *, struct sockaddr_in *); |
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237 | static int carp_del_addr(struct carp_softc *, struct sockaddr_in *); |
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238 | #endif |
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239 | static void carp_carpdev_state_locked(struct carp_if *); |
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240 | static void carp_sc_state_locked(struct carp_softc *); |
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241 | #ifdef INET6 |
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242 | static void carp_send_na(struct carp_softc *); |
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243 | static int carp_set_addr6(struct carp_softc *, struct sockaddr_in6 *); |
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244 | static int carp_del_addr6(struct carp_softc *, struct sockaddr_in6 *); |
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245 | static void carp_multicast6_cleanup(struct carp_softc *, int dofree); |
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246 | #endif |
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247 | |
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248 | static LIST_HEAD(, carp_softc) carpif_list; |
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249 | static struct mtx carp_mtx; |
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250 | IFC_SIMPLE_DECLARE(carp, 0); |
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251 | |
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252 | static eventhandler_tag if_detach_event_tag; |
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253 | |
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254 | static __inline u_int16_t |
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255 | carp_cksum(struct mbuf *m, int len) |
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256 | { |
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257 | return (in_cksum(m, len)); |
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258 | } |
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259 | |
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260 | static void |
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261 | carp_hmac_prepare(struct carp_softc *sc) |
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262 | { |
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263 | u_int8_t version = CARP_VERSION, type = CARP_ADVERTISEMENT; |
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264 | u_int8_t vhid = sc->sc_vhid & 0xff; |
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265 | struct ifaddr *ifa; |
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266 | int i, found; |
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267 | #ifdef INET |
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268 | struct in_addr last, cur, in; |
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269 | #endif |
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270 | #ifdef INET6 |
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271 | struct in6_addr last6, cur6, in6; |
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272 | #endif |
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273 | |
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274 | if (sc->sc_carpdev) |
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275 | CARP_SCLOCK(sc); |
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276 | |
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277 | /* XXX: possible race here */ |
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278 | |
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279 | /* compute ipad from key */ |
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280 | bzero(sc->sc_pad, sizeof(sc->sc_pad)); |
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281 | bcopy(sc->sc_key, sc->sc_pad, sizeof(sc->sc_key)); |
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282 | for (i = 0; i < sizeof(sc->sc_pad); i++) |
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283 | sc->sc_pad[i] ^= 0x36; |
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284 | |
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285 | /* precompute first part of inner hash */ |
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286 | SHA1Init(&sc->sc_sha1); |
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287 | SHA1Update(&sc->sc_sha1, sc->sc_pad, sizeof(sc->sc_pad)); |
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288 | SHA1Update(&sc->sc_sha1, (void *)&version, sizeof(version)); |
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289 | SHA1Update(&sc->sc_sha1, (void *)&type, sizeof(type)); |
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290 | SHA1Update(&sc->sc_sha1, (void *)&vhid, sizeof(vhid)); |
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291 | #ifdef INET |
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292 | cur.s_addr = 0; |
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293 | do { |
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294 | found = 0; |
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295 | last = cur; |
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296 | cur.s_addr = 0xffffffff; |
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297 | IF_ADDR_RLOCK(SC2IFP(sc)); |
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298 | TAILQ_FOREACH(ifa, &SC2IFP(sc)->if_addrlist, ifa_list) { |
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299 | in.s_addr = ifatoia(ifa)->ia_addr.sin_addr.s_addr; |
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300 | if (ifa->ifa_addr->sa_family == AF_INET && |
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301 | ntohl(in.s_addr) > ntohl(last.s_addr) && |
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302 | ntohl(in.s_addr) < ntohl(cur.s_addr)) { |
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303 | cur.s_addr = in.s_addr; |
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304 | found++; |
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305 | } |
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306 | } |
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307 | IF_ADDR_RUNLOCK(SC2IFP(sc)); |
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308 | if (found) |
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309 | SHA1Update(&sc->sc_sha1, (void *)&cur, sizeof(cur)); |
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310 | } while (found); |
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311 | #endif /* INET */ |
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312 | #ifdef INET6 |
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313 | memset(&cur6, 0, sizeof(cur6)); |
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314 | do { |
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315 | found = 0; |
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316 | last6 = cur6; |
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317 | memset(&cur6, 0xff, sizeof(cur6)); |
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318 | IF_ADDR_RLOCK(SC2IFP(sc)); |
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319 | TAILQ_FOREACH(ifa, &SC2IFP(sc)->if_addrlist, ifa_list) { |
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320 | in6 = ifatoia6(ifa)->ia_addr.sin6_addr; |
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321 | if (IN6_IS_SCOPE_EMBED(&in6)) |
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322 | in6.s6_addr16[1] = 0; |
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323 | if (ifa->ifa_addr->sa_family == AF_INET6 && |
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324 | memcmp(&in6, &last6, sizeof(in6)) > 0 && |
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325 | memcmp(&in6, &cur6, sizeof(in6)) < 0) { |
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326 | cur6 = in6; |
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327 | found++; |
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328 | } |
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329 | } |
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330 | IF_ADDR_RUNLOCK(SC2IFP(sc)); |
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331 | if (found) |
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332 | SHA1Update(&sc->sc_sha1, (void *)&cur6, sizeof(cur6)); |
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333 | } while (found); |
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334 | #endif /* INET6 */ |
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335 | |
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336 | /* convert ipad to opad */ |
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337 | for (i = 0; i < sizeof(sc->sc_pad); i++) |
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338 | sc->sc_pad[i] ^= 0x36 ^ 0x5c; |
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339 | |
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340 | if (sc->sc_carpdev) |
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341 | CARP_SCUNLOCK(sc); |
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342 | } |
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343 | |
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344 | static void |
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345 | carp_hmac_generate(struct carp_softc *sc, u_int32_t counter[2], |
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346 | unsigned char md[20]) |
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347 | { |
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348 | SHA1_CTX sha1ctx; |
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349 | |
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350 | /* fetch first half of inner hash */ |
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351 | bcopy(&sc->sc_sha1, &sha1ctx, sizeof(sha1ctx)); |
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352 | |
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353 | SHA1Update(&sha1ctx, (void *)counter, sizeof(sc->sc_counter)); |
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354 | SHA1Final(md, &sha1ctx); |
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355 | |
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356 | /* outer hash */ |
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357 | SHA1Init(&sha1ctx); |
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358 | SHA1Update(&sha1ctx, sc->sc_pad, sizeof(sc->sc_pad)); |
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359 | SHA1Update(&sha1ctx, md, 20); |
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360 | SHA1Final(md, &sha1ctx); |
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361 | } |
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362 | |
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363 | static int |
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364 | carp_hmac_verify(struct carp_softc *sc, u_int32_t counter[2], |
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365 | unsigned char md[20]) |
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366 | { |
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367 | unsigned char md2[20]; |
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368 | |
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369 | CARP_SCLOCK_ASSERT(sc); |
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370 | |
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371 | carp_hmac_generate(sc, counter, md2); |
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372 | |
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373 | return (bcmp(md, md2, sizeof(md2))); |
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374 | } |
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375 | |
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376 | static void |
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377 | carp_setroute(struct carp_softc *sc, int cmd) |
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378 | { |
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379 | struct ifaddr *ifa; |
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380 | int s; |
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381 | |
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382 | if (sc->sc_carpdev) |
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383 | CARP_SCLOCK_ASSERT(sc); |
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384 | |
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385 | s = splnet(); |
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386 | TAILQ_FOREACH(ifa, &SC2IFP(sc)->if_addrlist, ifa_list) { |
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387 | #ifdef INET |
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388 | if (ifa->ifa_addr->sa_family == AF_INET && |
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389 | sc->sc_carpdev != NULL) { |
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390 | int count = carp_addrcount( |
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391 | (struct carp_if *)sc->sc_carpdev->if_carp, |
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392 | ifatoia(ifa), CARP_COUNT_MASTER); |
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393 | |
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394 | if ((cmd == RTM_ADD && count == 1) || |
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395 | (cmd == RTM_DELETE && count == 0)) |
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396 | rtinit(ifa, cmd, RTF_UP | RTF_HOST); |
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397 | } |
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398 | #endif |
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399 | } |
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400 | splx(s); |
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401 | } |
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402 | |
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403 | static int |
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404 | carp_clone_create(struct if_clone *ifc, int unit, caddr_t params) |
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405 | { |
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406 | |
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407 | struct carp_softc *sc; |
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408 | struct ifnet *ifp; |
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409 | |
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410 | sc = malloc(sizeof(*sc), M_CARP, M_WAITOK|M_ZERO); |
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411 | ifp = SC2IFP(sc) = if_alloc(IFT_ETHER); |
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412 | if (ifp == NULL) { |
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413 | free(sc, M_CARP); |
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414 | return (ENOSPC); |
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415 | } |
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416 | |
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417 | sc->sc_flags_backup = 0; |
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418 | sc->sc_suppress = 0; |
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419 | sc->sc_advbase = CARP_DFLTINTV; |
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420 | sc->sc_vhid = -1; /* required setting */ |
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421 | sc->sc_advskew = 0; |
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422 | sc->sc_init_counter = 1; |
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423 | sc->sc_naddrs = sc->sc_naddrs6 = 0; /* M_ZERO? */ |
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424 | #ifdef INET |
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425 | sc->sc_imo.imo_membership = (struct in_multi **)malloc( |
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426 | (sizeof(struct in_multi *) * IP_MIN_MEMBERSHIPS), M_CARP, |
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427 | M_WAITOK); |
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428 | sc->sc_imo.imo_mfilters = NULL; |
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429 | sc->sc_imo.imo_max_memberships = IP_MIN_MEMBERSHIPS; |
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430 | sc->sc_imo.imo_multicast_vif = -1; |
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431 | #endif |
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432 | #ifdef INET6 |
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433 | sc->sc_im6o.im6o_membership = (struct in6_multi **)malloc( |
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434 | (sizeof(struct in6_multi *) * IPV6_MIN_MEMBERSHIPS), M_CARP, |
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435 | M_WAITOK); |
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436 | sc->sc_im6o.im6o_mfilters = NULL; |
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437 | sc->sc_im6o.im6o_max_memberships = IPV6_MIN_MEMBERSHIPS; |
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438 | sc->sc_im6o.im6o_multicast_hlim = CARP_DFLTTL; |
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439 | #endif |
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440 | |
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441 | callout_init(&sc->sc_ad_tmo, CALLOUT_MPSAFE); |
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442 | callout_init(&sc->sc_md_tmo, CALLOUT_MPSAFE); |
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443 | callout_init(&sc->sc_md6_tmo, CALLOUT_MPSAFE); |
---|
444 | |
---|
445 | ifp->if_softc = sc; |
---|
446 | if_initname(ifp, CARP_IFNAME, unit); |
---|
447 | ifp->if_mtu = ETHERMTU; |
---|
448 | ifp->if_flags = IFF_LOOPBACK; |
---|
449 | ifp->if_ioctl = carp_ioctl; |
---|
450 | ifp->if_output = carp_looutput; |
---|
451 | ifp->if_start = carp_start; |
---|
452 | ifp->if_type = IFT_CARP; |
---|
453 | ifp->if_snd.ifq_maxlen = ifqmaxlen; |
---|
454 | ifp->if_hdrlen = 0; |
---|
455 | if_attach(ifp); |
---|
456 | bpfattach(SC2IFP(sc), DLT_NULL, sizeof(u_int32_t)); |
---|
457 | mtx_lock(&carp_mtx); |
---|
458 | LIST_INSERT_HEAD(&carpif_list, sc, sc_next); |
---|
459 | mtx_unlock(&carp_mtx); |
---|
460 | return (0); |
---|
461 | } |
---|
462 | |
---|
463 | static void |
---|
464 | carp_clone_destroy(struct ifnet *ifp) |
---|
465 | { |
---|
466 | struct carp_softc *sc = ifp->if_softc; |
---|
467 | |
---|
468 | if (sc->sc_carpdev) |
---|
469 | CARP_SCLOCK(sc); |
---|
470 | carpdetach(sc, 1); /* Returns unlocked. */ |
---|
471 | |
---|
472 | mtx_lock(&carp_mtx); |
---|
473 | LIST_REMOVE(sc, sc_next); |
---|
474 | mtx_unlock(&carp_mtx); |
---|
475 | bpfdetach(ifp); |
---|
476 | if_detach(ifp); |
---|
477 | if_free_type(ifp, IFT_ETHER); |
---|
478 | #ifdef INET |
---|
479 | free(sc->sc_imo.imo_membership, M_CARP); |
---|
480 | #endif |
---|
481 | #ifdef INET6 |
---|
482 | free(sc->sc_im6o.im6o_membership, M_CARP); |
---|
483 | #endif |
---|
484 | free(sc, M_CARP); |
---|
485 | } |
---|
486 | |
---|
487 | /* |
---|
488 | * This function can be called on CARP interface destroy path, |
---|
489 | * and in case of the removal of the underlying interface as |
---|
490 | * well. We differentiate these two cases: in case of destruction |
---|
491 | * of the underlying interface, we do not cleanup our multicast |
---|
492 | * memberships, since they are already freed. But we purge pointers |
---|
493 | * to multicast structures, since they are no longer valid, to |
---|
494 | * avoid panic in future calls to carpdetach(). Also, we do not |
---|
495 | * release the lock on return, because the function will be |
---|
496 | * called once more, for another CARP instance on the same |
---|
497 | * interface. |
---|
498 | */ |
---|
499 | static void |
---|
500 | carpdetach(struct carp_softc *sc, int unlock) |
---|
501 | { |
---|
502 | struct carp_if *cif; |
---|
503 | |
---|
504 | callout_stop(&sc->sc_ad_tmo); |
---|
505 | callout_stop(&sc->sc_md_tmo); |
---|
506 | callout_stop(&sc->sc_md6_tmo); |
---|
507 | |
---|
508 | if (sc->sc_suppress) |
---|
509 | carp_suppress_preempt--; |
---|
510 | sc->sc_suppress = 0; |
---|
511 | |
---|
512 | if (sc->sc_sendad_errors >= CARP_SENDAD_MAX_ERRORS) |
---|
513 | carp_suppress_preempt--; |
---|
514 | sc->sc_sendad_errors = 0; |
---|
515 | |
---|
516 | carp_set_state(sc, INIT); |
---|
517 | SC2IFP(sc)->if_flags &= ~IFF_UP; |
---|
518 | carp_setrun(sc, 0); |
---|
519 | #ifdef INET |
---|
520 | carp_multicast_cleanup(sc, unlock); |
---|
521 | #endif |
---|
522 | #ifdef INET6 |
---|
523 | carp_multicast6_cleanup(sc, unlock); |
---|
524 | #endif |
---|
525 | |
---|
526 | if (sc->sc_carpdev != NULL) { |
---|
527 | cif = (struct carp_if *)sc->sc_carpdev->if_carp; |
---|
528 | CARP_LOCK_ASSERT(cif); |
---|
529 | TAILQ_REMOVE(&cif->vhif_vrs, sc, sc_list); |
---|
530 | if (!--cif->vhif_nvrs) { |
---|
531 | ifpromisc(sc->sc_carpdev, 0); |
---|
532 | sc->sc_carpdev->if_carp = NULL; |
---|
533 | CARP_LOCK_DESTROY(cif); |
---|
534 | free(cif, M_CARP); |
---|
535 | } else if (unlock) |
---|
536 | CARP_UNLOCK(cif); |
---|
537 | sc->sc_carpdev = NULL; |
---|
538 | } |
---|
539 | } |
---|
540 | |
---|
541 | /* Detach an interface from the carp. */ |
---|
542 | static void |
---|
543 | carp_ifdetach(void *arg __unused, struct ifnet *ifp) |
---|
544 | { |
---|
545 | struct carp_if *cif = (struct carp_if *)ifp->if_carp; |
---|
546 | struct carp_softc *sc, *nextsc; |
---|
547 | |
---|
548 | if (cif == NULL) |
---|
549 | return; |
---|
550 | |
---|
551 | /* |
---|
552 | * XXX: At the end of for() cycle the lock will be destroyed. |
---|
553 | */ |
---|
554 | CARP_LOCK(cif); |
---|
555 | for (sc = TAILQ_FIRST(&cif->vhif_vrs); sc; sc = nextsc) { |
---|
556 | nextsc = TAILQ_NEXT(sc, sc_list); |
---|
557 | carpdetach(sc, 0); |
---|
558 | } |
---|
559 | } |
---|
560 | |
---|
561 | /* |
---|
562 | * process input packet. |
---|
563 | * we have rearranged checks order compared to the rfc, |
---|
564 | * but it seems more efficient this way or not possible otherwise. |
---|
565 | */ |
---|
566 | #ifdef INET |
---|
567 | void |
---|
568 | carp_input(struct mbuf *m, int hlen) |
---|
569 | { |
---|
570 | struct ip *ip = mtod(m, struct ip *); |
---|
571 | struct carp_header *ch; |
---|
572 | int iplen, len; |
---|
573 | |
---|
574 | CARPSTATS_INC(carps_ipackets); |
---|
575 | |
---|
576 | if (!carp_opts[CARPCTL_ALLOW]) { |
---|
577 | m_freem(m); |
---|
578 | return; |
---|
579 | } |
---|
580 | |
---|
581 | /* check if received on a valid carp interface */ |
---|
582 | if (m->m_pkthdr.rcvif->if_carp == NULL) { |
---|
583 | CARPSTATS_INC(carps_badif); |
---|
584 | CARP_DEBUG("carp_input: packet received on non-carp " |
---|
585 | "interface: %s\n", |
---|
586 | m->m_pkthdr.rcvif->if_xname); |
---|
587 | m_freem(m); |
---|
588 | return; |
---|
589 | } |
---|
590 | |
---|
591 | /* verify that the IP TTL is 255. */ |
---|
592 | if (ip->ip_ttl != CARP_DFLTTL) { |
---|
593 | CARPSTATS_INC(carps_badttl); |
---|
594 | CARP_DEBUG("carp_input: received ttl %d != 255 on %s\n", |
---|
595 | ip->ip_ttl, |
---|
596 | m->m_pkthdr.rcvif->if_xname); |
---|
597 | m_freem(m); |
---|
598 | return; |
---|
599 | } |
---|
600 | |
---|
601 | iplen = ip->ip_hl << 2; |
---|
602 | |
---|
603 | if (m->m_pkthdr.len < iplen + sizeof(*ch)) { |
---|
604 | CARPSTATS_INC(carps_badlen); |
---|
605 | CARP_DEBUG("carp_input: received len %zd < " |
---|
606 | "sizeof(struct carp_header) on %s\n", |
---|
607 | m->m_len - sizeof(struct ip), |
---|
608 | m->m_pkthdr.rcvif->if_xname); |
---|
609 | m_freem(m); |
---|
610 | return; |
---|
611 | } |
---|
612 | |
---|
613 | if (iplen + sizeof(*ch) < m->m_len) { |
---|
614 | if ((m = m_pullup(m, iplen + sizeof(*ch))) == NULL) { |
---|
615 | CARPSTATS_INC(carps_hdrops); |
---|
616 | CARP_DEBUG("carp_input: pullup failed\n"); |
---|
617 | return; |
---|
618 | } |
---|
619 | ip = mtod(m, struct ip *); |
---|
620 | } |
---|
621 | ch = (struct carp_header *)((char *)ip + iplen); |
---|
622 | |
---|
623 | /* |
---|
624 | * verify that the received packet length is |
---|
625 | * equal to the CARP header |
---|
626 | */ |
---|
627 | len = iplen + sizeof(*ch); |
---|
628 | if (len > m->m_pkthdr.len) { |
---|
629 | CARPSTATS_INC(carps_badlen); |
---|
630 | CARP_DEBUG("carp_input: packet too short %d on %s\n", |
---|
631 | m->m_pkthdr.len, |
---|
632 | m->m_pkthdr.rcvif->if_xname); |
---|
633 | m_freem(m); |
---|
634 | return; |
---|
635 | } |
---|
636 | |
---|
637 | if ((m = m_pullup(m, len)) == NULL) { |
---|
638 | CARPSTATS_INC(carps_hdrops); |
---|
639 | return; |
---|
640 | } |
---|
641 | ip = mtod(m, struct ip *); |
---|
642 | ch = (struct carp_header *)((char *)ip + iplen); |
---|
643 | |
---|
644 | /* verify the CARP checksum */ |
---|
645 | m->m_data += iplen; |
---|
646 | if (carp_cksum(m, len - iplen)) { |
---|
647 | CARPSTATS_INC(carps_badsum); |
---|
648 | CARP_DEBUG("carp_input: checksum failed on %s\n", |
---|
649 | m->m_pkthdr.rcvif->if_xname); |
---|
650 | m_freem(m); |
---|
651 | return; |
---|
652 | } |
---|
653 | m->m_data -= iplen; |
---|
654 | |
---|
655 | carp_input_c(m, ch, AF_INET); |
---|
656 | } |
---|
657 | #endif |
---|
658 | |
---|
659 | #ifdef INET6 |
---|
660 | int |
---|
661 | carp6_input(struct mbuf **mp, int *offp, int proto) |
---|
662 | { |
---|
663 | struct mbuf *m = *mp; |
---|
664 | struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); |
---|
665 | struct carp_header *ch; |
---|
666 | u_int len; |
---|
667 | |
---|
668 | CARPSTATS_INC(carps_ipackets6); |
---|
669 | |
---|
670 | if (!carp_opts[CARPCTL_ALLOW]) { |
---|
671 | m_freem(m); |
---|
672 | return (IPPROTO_DONE); |
---|
673 | } |
---|
674 | |
---|
675 | /* check if received on a valid carp interface */ |
---|
676 | if (m->m_pkthdr.rcvif->if_carp == NULL) { |
---|
677 | CARPSTATS_INC(carps_badif); |
---|
678 | CARP_DEBUG("carp6_input: packet received on non-carp " |
---|
679 | "interface: %s\n", |
---|
680 | m->m_pkthdr.rcvif->if_xname); |
---|
681 | m_freem(m); |
---|
682 | return (IPPROTO_DONE); |
---|
683 | } |
---|
684 | |
---|
685 | /* verify that the IP TTL is 255 */ |
---|
686 | if (ip6->ip6_hlim != CARP_DFLTTL) { |
---|
687 | CARPSTATS_INC(carps_badttl); |
---|
688 | CARP_DEBUG("carp6_input: received ttl %d != 255 on %s\n", |
---|
689 | ip6->ip6_hlim, |
---|
690 | m->m_pkthdr.rcvif->if_xname); |
---|
691 | m_freem(m); |
---|
692 | return (IPPROTO_DONE); |
---|
693 | } |
---|
694 | |
---|
695 | /* verify that we have a complete carp packet */ |
---|
696 | len = m->m_len; |
---|
697 | IP6_EXTHDR_GET(ch, struct carp_header *, m, *offp, sizeof(*ch)); |
---|
698 | if (ch == NULL) { |
---|
699 | CARPSTATS_INC(carps_badlen); |
---|
700 | CARP_DEBUG("carp6_input: packet size %u too small\n", len); |
---|
701 | return (IPPROTO_DONE); |
---|
702 | } |
---|
703 | |
---|
704 | |
---|
705 | /* verify the CARP checksum */ |
---|
706 | m->m_data += *offp; |
---|
707 | if (carp_cksum(m, sizeof(*ch))) { |
---|
708 | CARPSTATS_INC(carps_badsum); |
---|
709 | CARP_DEBUG("carp6_input: checksum failed, on %s\n", |
---|
710 | m->m_pkthdr.rcvif->if_xname); |
---|
711 | m_freem(m); |
---|
712 | return (IPPROTO_DONE); |
---|
713 | } |
---|
714 | m->m_data -= *offp; |
---|
715 | |
---|
716 | carp_input_c(m, ch, AF_INET6); |
---|
717 | return (IPPROTO_DONE); |
---|
718 | } |
---|
719 | #endif /* INET6 */ |
---|
720 | |
---|
721 | static void |
---|
722 | carp_input_c(struct mbuf *m, struct carp_header *ch, sa_family_t af) |
---|
723 | { |
---|
724 | struct ifnet *ifp = m->m_pkthdr.rcvif; |
---|
725 | struct carp_softc *sc; |
---|
726 | u_int64_t tmp_counter; |
---|
727 | struct timeval sc_tv, ch_tv; |
---|
728 | |
---|
729 | /* verify that the VHID is valid on the receiving interface */ |
---|
730 | CARP_LOCK(ifp->if_carp); |
---|
731 | TAILQ_FOREACH(sc, &((struct carp_if *)ifp->if_carp)->vhif_vrs, sc_list) |
---|
732 | if (sc->sc_vhid == ch->carp_vhid) |
---|
733 | break; |
---|
734 | |
---|
735 | if (!sc || !((SC2IFP(sc)->if_flags & IFF_UP) && |
---|
736 | (SC2IFP(sc)->if_drv_flags & IFF_DRV_RUNNING))) { |
---|
737 | CARPSTATS_INC(carps_badvhid); |
---|
738 | CARP_UNLOCK(ifp->if_carp); |
---|
739 | m_freem(m); |
---|
740 | return; |
---|
741 | } |
---|
742 | |
---|
743 | getmicrotime(&SC2IFP(sc)->if_lastchange); |
---|
744 | SC2IFP(sc)->if_ipackets++; |
---|
745 | SC2IFP(sc)->if_ibytes += m->m_pkthdr.len; |
---|
746 | |
---|
747 | if (bpf_peers_present(SC2IFP(sc)->if_bpf)) { |
---|
748 | uint32_t af1 = af; |
---|
749 | #ifdef INET |
---|
750 | struct ip *ip = mtod(m, struct ip *); |
---|
751 | |
---|
752 | /* BPF wants net byte order */ |
---|
753 | if (af == AF_INET) { |
---|
754 | ip->ip_len = htons(ip->ip_len + (ip->ip_hl << 2)); |
---|
755 | ip->ip_off = htons(ip->ip_off); |
---|
756 | } |
---|
757 | #endif |
---|
758 | bpf_mtap2(SC2IFP(sc)->if_bpf, &af1, sizeof(af1), m); |
---|
759 | } |
---|
760 | |
---|
761 | /* verify the CARP version. */ |
---|
762 | if (ch->carp_version != CARP_VERSION) { |
---|
763 | CARPSTATS_INC(carps_badver); |
---|
764 | SC2IFP(sc)->if_ierrors++; |
---|
765 | CARP_UNLOCK(ifp->if_carp); |
---|
766 | CARP_DEBUG("%s; invalid version %d\n", |
---|
767 | SC2IFP(sc)->if_xname, |
---|
768 | ch->carp_version); |
---|
769 | m_freem(m); |
---|
770 | return; |
---|
771 | } |
---|
772 | |
---|
773 | /* verify the hash */ |
---|
774 | if (carp_hmac_verify(sc, ch->carp_counter, ch->carp_md)) { |
---|
775 | CARPSTATS_INC(carps_badauth); |
---|
776 | SC2IFP(sc)->if_ierrors++; |
---|
777 | CARP_UNLOCK(ifp->if_carp); |
---|
778 | CARP_DEBUG("%s: incorrect hash\n", SC2IFP(sc)->if_xname); |
---|
779 | m_freem(m); |
---|
780 | return; |
---|
781 | } |
---|
782 | |
---|
783 | tmp_counter = ntohl(ch->carp_counter[0]); |
---|
784 | tmp_counter = tmp_counter<<32; |
---|
785 | tmp_counter += ntohl(ch->carp_counter[1]); |
---|
786 | |
---|
787 | /* XXX Replay protection goes here */ |
---|
788 | |
---|
789 | sc->sc_init_counter = 0; |
---|
790 | sc->sc_counter = tmp_counter; |
---|
791 | |
---|
792 | sc_tv.tv_sec = sc->sc_advbase; |
---|
793 | if (carp_suppress_preempt && sc->sc_advskew < 240) |
---|
794 | sc_tv.tv_usec = 240 * 1000000 / 256; |
---|
795 | else |
---|
796 | sc_tv.tv_usec = sc->sc_advskew * 1000000 / 256; |
---|
797 | ch_tv.tv_sec = ch->carp_advbase; |
---|
798 | ch_tv.tv_usec = ch->carp_advskew * 1000000 / 256; |
---|
799 | |
---|
800 | switch (sc->sc_state) { |
---|
801 | case INIT: |
---|
802 | break; |
---|
803 | case MASTER: |
---|
804 | /* |
---|
805 | * If we receive an advertisement from a master who's going to |
---|
806 | * be more frequent than us, go into BACKUP state. |
---|
807 | */ |
---|
808 | if (timevalcmp(&sc_tv, &ch_tv, >) || |
---|
809 | timevalcmp(&sc_tv, &ch_tv, ==)) { |
---|
810 | callout_stop(&sc->sc_ad_tmo); |
---|
811 | CARP_LOG("%s: MASTER -> BACKUP " |
---|
812 | "(more frequent advertisement received)\n", |
---|
813 | SC2IFP(sc)->if_xname); |
---|
814 | carp_set_state(sc, BACKUP); |
---|
815 | carp_setrun(sc, 0); |
---|
816 | carp_setroute(sc, RTM_DELETE); |
---|
817 | } |
---|
818 | break; |
---|
819 | case BACKUP: |
---|
820 | /* |
---|
821 | * If we're pre-empting masters who advertise slower than us, |
---|
822 | * and this one claims to be slower, treat him as down. |
---|
823 | */ |
---|
824 | if (carp_opts[CARPCTL_PREEMPT] && |
---|
825 | timevalcmp(&sc_tv, &ch_tv, <)) { |
---|
826 | CARP_LOG("%s: BACKUP -> MASTER " |
---|
827 | "(preempting a slower master)\n", |
---|
828 | SC2IFP(sc)->if_xname); |
---|
829 | carp_master_down_locked(sc); |
---|
830 | break; |
---|
831 | } |
---|
832 | |
---|
833 | /* |
---|
834 | * If the master is going to advertise at such a low frequency |
---|
835 | * that he's guaranteed to time out, we'd might as well just |
---|
836 | * treat him as timed out now. |
---|
837 | */ |
---|
838 | sc_tv.tv_sec = sc->sc_advbase * 3; |
---|
839 | if (timevalcmp(&sc_tv, &ch_tv, <)) { |
---|
840 | CARP_LOG("%s: BACKUP -> MASTER " |
---|
841 | "(master timed out)\n", |
---|
842 | SC2IFP(sc)->if_xname); |
---|
843 | carp_master_down_locked(sc); |
---|
844 | break; |
---|
845 | } |
---|
846 | |
---|
847 | /* |
---|
848 | * Otherwise, we reset the counter and wait for the next |
---|
849 | * advertisement. |
---|
850 | */ |
---|
851 | carp_setrun(sc, af); |
---|
852 | break; |
---|
853 | } |
---|
854 | |
---|
855 | CARP_UNLOCK(ifp->if_carp); |
---|
856 | |
---|
857 | m_freem(m); |
---|
858 | return; |
---|
859 | } |
---|
860 | |
---|
861 | static int |
---|
862 | carp_prepare_ad(struct mbuf *m, struct carp_softc *sc, struct carp_header *ch) |
---|
863 | { |
---|
864 | struct m_tag *mtag; |
---|
865 | struct ifnet *ifp = SC2IFP(sc); |
---|
866 | |
---|
867 | if (sc->sc_init_counter) { |
---|
868 | /* this could also be seconds since unix epoch */ |
---|
869 | sc->sc_counter = arc4random(); |
---|
870 | sc->sc_counter = sc->sc_counter << 32; |
---|
871 | sc->sc_counter += arc4random(); |
---|
872 | } else |
---|
873 | sc->sc_counter++; |
---|
874 | |
---|
875 | ch->carp_counter[0] = htonl((sc->sc_counter>>32)&0xffffffff); |
---|
876 | ch->carp_counter[1] = htonl(sc->sc_counter&0xffffffff); |
---|
877 | |
---|
878 | carp_hmac_generate(sc, ch->carp_counter, ch->carp_md); |
---|
879 | |
---|
880 | /* Tag packet for carp_output */ |
---|
881 | mtag = m_tag_get(PACKET_TAG_CARP, sizeof(struct ifnet *), M_NOWAIT); |
---|
882 | if (mtag == NULL) { |
---|
883 | m_freem(m); |
---|
884 | SC2IFP(sc)->if_oerrors++; |
---|
885 | return (ENOMEM); |
---|
886 | } |
---|
887 | bcopy(&ifp, (caddr_t)(mtag + 1), sizeof(struct ifnet *)); |
---|
888 | m_tag_prepend(m, mtag); |
---|
889 | |
---|
890 | return (0); |
---|
891 | } |
---|
892 | |
---|
893 | static void |
---|
894 | carp_send_ad_all(void) |
---|
895 | { |
---|
896 | struct carp_softc *sc; |
---|
897 | |
---|
898 | mtx_lock(&carp_mtx); |
---|
899 | LIST_FOREACH(sc, &carpif_list, sc_next) { |
---|
900 | if (sc->sc_carpdev == NULL) |
---|
901 | continue; |
---|
902 | CARP_SCLOCK(sc); |
---|
903 | if ((SC2IFP(sc)->if_flags & IFF_UP) && |
---|
904 | (SC2IFP(sc)->if_drv_flags & IFF_DRV_RUNNING) && |
---|
905 | sc->sc_state == MASTER) |
---|
906 | carp_send_ad_locked(sc); |
---|
907 | CARP_SCUNLOCK(sc); |
---|
908 | } |
---|
909 | mtx_unlock(&carp_mtx); |
---|
910 | } |
---|
911 | |
---|
912 | static void |
---|
913 | carp_send_ad(void *v) |
---|
914 | { |
---|
915 | struct carp_softc *sc = v; |
---|
916 | |
---|
917 | CARP_SCLOCK(sc); |
---|
918 | carp_send_ad_locked(sc); |
---|
919 | CARP_SCUNLOCK(sc); |
---|
920 | } |
---|
921 | |
---|
922 | static void |
---|
923 | carp_send_ad_locked(struct carp_softc *sc) |
---|
924 | { |
---|
925 | struct carp_header ch; |
---|
926 | struct timeval tv; |
---|
927 | struct carp_header *ch_ptr; |
---|
928 | struct mbuf *m; |
---|
929 | int len, advbase, advskew; |
---|
930 | |
---|
931 | CARP_SCLOCK_ASSERT(sc); |
---|
932 | |
---|
933 | /* bow out if we've lost our UPness or RUNNINGuiness */ |
---|
934 | if (!((SC2IFP(sc)->if_flags & IFF_UP) && |
---|
935 | (SC2IFP(sc)->if_drv_flags & IFF_DRV_RUNNING))) { |
---|
936 | advbase = 255; |
---|
937 | advskew = 255; |
---|
938 | } else { |
---|
939 | advbase = sc->sc_advbase; |
---|
940 | if (!carp_suppress_preempt || sc->sc_advskew > 240) |
---|
941 | advskew = sc->sc_advskew; |
---|
942 | else |
---|
943 | advskew = 240; |
---|
944 | tv.tv_sec = advbase; |
---|
945 | tv.tv_usec = advskew * 1000000 / 256; |
---|
946 | } |
---|
947 | |
---|
948 | ch.carp_version = CARP_VERSION; |
---|
949 | ch.carp_type = CARP_ADVERTISEMENT; |
---|
950 | ch.carp_vhid = sc->sc_vhid; |
---|
951 | ch.carp_advbase = advbase; |
---|
952 | ch.carp_advskew = advskew; |
---|
953 | ch.carp_authlen = 7; /* XXX DEFINE */ |
---|
954 | ch.carp_pad1 = 0; /* must be zero */ |
---|
955 | ch.carp_cksum = 0; |
---|
956 | |
---|
957 | #ifdef INET |
---|
958 | if (sc->sc_ia) { |
---|
959 | struct ip *ip; |
---|
960 | |
---|
961 | MGETHDR(m, M_DONTWAIT, MT_HEADER); |
---|
962 | if (m == NULL) { |
---|
963 | SC2IFP(sc)->if_oerrors++; |
---|
964 | CARPSTATS_INC(carps_onomem); |
---|
965 | /* XXX maybe less ? */ |
---|
966 | if (advbase != 255 || advskew != 255) |
---|
967 | callout_reset(&sc->sc_ad_tmo, tvtohz(&tv), |
---|
968 | carp_send_ad, sc); |
---|
969 | return; |
---|
970 | } |
---|
971 | len = sizeof(*ip) + sizeof(ch); |
---|
972 | m->m_pkthdr.len = len; |
---|
973 | m->m_pkthdr.rcvif = NULL; |
---|
974 | m->m_len = len; |
---|
975 | MH_ALIGN(m, m->m_len); |
---|
976 | m->m_flags |= M_MCAST; |
---|
977 | ip = mtod(m, struct ip *); |
---|
978 | ip->ip_v = IPVERSION; |
---|
979 | ip->ip_hl = sizeof(*ip) >> 2; |
---|
980 | ip->ip_tos = IPTOS_LOWDELAY; |
---|
981 | ip->ip_len = len; |
---|
982 | ip->ip_id = ip_newid(); |
---|
983 | ip->ip_off = IP_DF; |
---|
984 | ip->ip_ttl = CARP_DFLTTL; |
---|
985 | ip->ip_p = IPPROTO_CARP; |
---|
986 | ip->ip_sum = 0; |
---|
987 | ip->ip_src.s_addr = sc->sc_ia->ia_addr.sin_addr.s_addr; |
---|
988 | ip->ip_dst.s_addr = htonl(INADDR_CARP_GROUP); |
---|
989 | |
---|
990 | ch_ptr = (struct carp_header *)(&ip[1]); |
---|
991 | bcopy(&ch, ch_ptr, sizeof(ch)); |
---|
992 | if (carp_prepare_ad(m, sc, ch_ptr)) |
---|
993 | return; |
---|
994 | |
---|
995 | m->m_data += sizeof(*ip); |
---|
996 | ch_ptr->carp_cksum = carp_cksum(m, len - sizeof(*ip)); |
---|
997 | m->m_data -= sizeof(*ip); |
---|
998 | |
---|
999 | getmicrotime(&SC2IFP(sc)->if_lastchange); |
---|
1000 | SC2IFP(sc)->if_opackets++; |
---|
1001 | SC2IFP(sc)->if_obytes += len; |
---|
1002 | CARPSTATS_INC(carps_opackets); |
---|
1003 | |
---|
1004 | if (ip_output(m, NULL, NULL, IP_RAWOUTPUT, &sc->sc_imo, NULL)) { |
---|
1005 | SC2IFP(sc)->if_oerrors++; |
---|
1006 | if (sc->sc_sendad_errors < INT_MAX) |
---|
1007 | sc->sc_sendad_errors++; |
---|
1008 | if (sc->sc_sendad_errors == CARP_SENDAD_MAX_ERRORS) { |
---|
1009 | carp_suppress_preempt++; |
---|
1010 | if (carp_suppress_preempt == 1) { |
---|
1011 | CARP_SCUNLOCK(sc); |
---|
1012 | carp_send_ad_all(); |
---|
1013 | CARP_SCLOCK(sc); |
---|
1014 | } |
---|
1015 | } |
---|
1016 | sc->sc_sendad_success = 0; |
---|
1017 | } else { |
---|
1018 | if (sc->sc_sendad_errors >= CARP_SENDAD_MAX_ERRORS) { |
---|
1019 | if (++sc->sc_sendad_success >= |
---|
1020 | CARP_SENDAD_MIN_SUCCESS) { |
---|
1021 | carp_suppress_preempt--; |
---|
1022 | sc->sc_sendad_errors = 0; |
---|
1023 | } |
---|
1024 | } else |
---|
1025 | sc->sc_sendad_errors = 0; |
---|
1026 | } |
---|
1027 | } |
---|
1028 | #endif /* INET */ |
---|
1029 | #ifdef INET6 |
---|
1030 | if (sc->sc_ia6) { |
---|
1031 | struct ip6_hdr *ip6; |
---|
1032 | |
---|
1033 | MGETHDR(m, M_DONTWAIT, MT_HEADER); |
---|
1034 | if (m == NULL) { |
---|
1035 | SC2IFP(sc)->if_oerrors++; |
---|
1036 | CARPSTATS_INC(carps_onomem); |
---|
1037 | /* XXX maybe less ? */ |
---|
1038 | if (advbase != 255 || advskew != 255) |
---|
1039 | callout_reset(&sc->sc_ad_tmo, tvtohz(&tv), |
---|
1040 | carp_send_ad, sc); |
---|
1041 | return; |
---|
1042 | } |
---|
1043 | len = sizeof(*ip6) + sizeof(ch); |
---|
1044 | m->m_pkthdr.len = len; |
---|
1045 | m->m_pkthdr.rcvif = NULL; |
---|
1046 | m->m_len = len; |
---|
1047 | MH_ALIGN(m, m->m_len); |
---|
1048 | m->m_flags |= M_MCAST; |
---|
1049 | ip6 = mtod(m, struct ip6_hdr *); |
---|
1050 | bzero(ip6, sizeof(*ip6)); |
---|
1051 | ip6->ip6_vfc |= IPV6_VERSION; |
---|
1052 | ip6->ip6_hlim = CARP_DFLTTL; |
---|
1053 | ip6->ip6_nxt = IPPROTO_CARP; |
---|
1054 | bcopy(&sc->sc_ia6->ia_addr.sin6_addr, &ip6->ip6_src, |
---|
1055 | sizeof(struct in6_addr)); |
---|
1056 | /* set the multicast destination */ |
---|
1057 | |
---|
1058 | ip6->ip6_dst.s6_addr16[0] = htons(0xff02); |
---|
1059 | ip6->ip6_dst.s6_addr8[15] = 0x12; |
---|
1060 | if (in6_setscope(&ip6->ip6_dst, sc->sc_carpdev, NULL) != 0) { |
---|
1061 | SC2IFP(sc)->if_oerrors++; |
---|
1062 | m_freem(m); |
---|
1063 | CARP_DEBUG("%s: in6_setscope failed\n", __func__); |
---|
1064 | return; |
---|
1065 | } |
---|
1066 | |
---|
1067 | ch_ptr = (struct carp_header *)(&ip6[1]); |
---|
1068 | bcopy(&ch, ch_ptr, sizeof(ch)); |
---|
1069 | if (carp_prepare_ad(m, sc, ch_ptr)) |
---|
1070 | return; |
---|
1071 | |
---|
1072 | m->m_data += sizeof(*ip6); |
---|
1073 | ch_ptr->carp_cksum = carp_cksum(m, len - sizeof(*ip6)); |
---|
1074 | m->m_data -= sizeof(*ip6); |
---|
1075 | |
---|
1076 | getmicrotime(&SC2IFP(sc)->if_lastchange); |
---|
1077 | SC2IFP(sc)->if_opackets++; |
---|
1078 | SC2IFP(sc)->if_obytes += len; |
---|
1079 | CARPSTATS_INC(carps_opackets6); |
---|
1080 | |
---|
1081 | if (ip6_output(m, NULL, NULL, 0, &sc->sc_im6o, NULL, NULL)) { |
---|
1082 | SC2IFP(sc)->if_oerrors++; |
---|
1083 | if (sc->sc_sendad_errors < INT_MAX) |
---|
1084 | sc->sc_sendad_errors++; |
---|
1085 | if (sc->sc_sendad_errors == CARP_SENDAD_MAX_ERRORS) { |
---|
1086 | carp_suppress_preempt++; |
---|
1087 | if (carp_suppress_preempt == 1) { |
---|
1088 | CARP_SCUNLOCK(sc); |
---|
1089 | carp_send_ad_all(); |
---|
1090 | CARP_SCLOCK(sc); |
---|
1091 | } |
---|
1092 | } |
---|
1093 | sc->sc_sendad_success = 0; |
---|
1094 | } else { |
---|
1095 | if (sc->sc_sendad_errors >= CARP_SENDAD_MAX_ERRORS) { |
---|
1096 | if (++sc->sc_sendad_success >= |
---|
1097 | CARP_SENDAD_MIN_SUCCESS) { |
---|
1098 | carp_suppress_preempt--; |
---|
1099 | sc->sc_sendad_errors = 0; |
---|
1100 | } |
---|
1101 | } else |
---|
1102 | sc->sc_sendad_errors = 0; |
---|
1103 | } |
---|
1104 | } |
---|
1105 | #endif /* INET6 */ |
---|
1106 | |
---|
1107 | if (advbase != 255 || advskew != 255) |
---|
1108 | callout_reset(&sc->sc_ad_tmo, tvtohz(&tv), |
---|
1109 | carp_send_ad, sc); |
---|
1110 | |
---|
1111 | } |
---|
1112 | |
---|
1113 | #ifdef INET |
---|
1114 | /* |
---|
1115 | * Broadcast a gratuitous ARP request containing |
---|
1116 | * the virtual router MAC address for each IP address |
---|
1117 | * associated with the virtual router. |
---|
1118 | */ |
---|
1119 | static void |
---|
1120 | carp_send_arp(struct carp_softc *sc) |
---|
1121 | { |
---|
1122 | struct ifaddr *ifa; |
---|
1123 | |
---|
1124 | TAILQ_FOREACH(ifa, &SC2IFP(sc)->if_addrlist, ifa_list) { |
---|
1125 | |
---|
1126 | if (ifa->ifa_addr->sa_family != AF_INET) |
---|
1127 | continue; |
---|
1128 | |
---|
1129 | /* arprequest(sc->sc_carpdev, &in, &in, IF_LLADDR(sc->sc_ifp)); */ |
---|
1130 | arp_ifinit2(sc->sc_carpdev, ifa, IF_LLADDR(sc->sc_ifp)); |
---|
1131 | |
---|
1132 | DELAY(1000); /* XXX */ |
---|
1133 | } |
---|
1134 | } |
---|
1135 | #endif |
---|
1136 | |
---|
1137 | #ifdef INET6 |
---|
1138 | static void |
---|
1139 | carp_send_na(struct carp_softc *sc) |
---|
1140 | { |
---|
1141 | struct ifaddr *ifa; |
---|
1142 | struct in6_addr *in6; |
---|
1143 | static struct in6_addr mcast = IN6ADDR_LINKLOCAL_ALLNODES_INIT; |
---|
1144 | |
---|
1145 | TAILQ_FOREACH(ifa, &SC2IFP(sc)->if_addrlist, ifa_list) { |
---|
1146 | |
---|
1147 | if (ifa->ifa_addr->sa_family != AF_INET6) |
---|
1148 | continue; |
---|
1149 | |
---|
1150 | in6 = &ifatoia6(ifa)->ia_addr.sin6_addr; |
---|
1151 | nd6_na_output(sc->sc_carpdev, &mcast, in6, |
---|
1152 | ND_NA_FLAG_OVERRIDE, 1, NULL); |
---|
1153 | DELAY(1000); /* XXX */ |
---|
1154 | } |
---|
1155 | } |
---|
1156 | #endif /* INET6 */ |
---|
1157 | |
---|
1158 | #ifdef INET |
---|
1159 | static int |
---|
1160 | carp_addrcount(struct carp_if *cif, struct in_ifaddr *ia, int type) |
---|
1161 | { |
---|
1162 | struct carp_softc *vh; |
---|
1163 | struct ifaddr *ifa; |
---|
1164 | int count = 0; |
---|
1165 | |
---|
1166 | CARP_LOCK_ASSERT(cif); |
---|
1167 | |
---|
1168 | TAILQ_FOREACH(vh, &cif->vhif_vrs, sc_list) { |
---|
1169 | if ((type == CARP_COUNT_RUNNING && |
---|
1170 | (SC2IFP(vh)->if_flags & IFF_UP) && |
---|
1171 | (SC2IFP(vh)->if_drv_flags & IFF_DRV_RUNNING)) || |
---|
1172 | (type == CARP_COUNT_MASTER && vh->sc_state == MASTER)) { |
---|
1173 | IF_ADDR_RLOCK(SC2IFP(vh)); |
---|
1174 | TAILQ_FOREACH(ifa, &SC2IFP(vh)->if_addrlist, |
---|
1175 | ifa_list) { |
---|
1176 | if (ifa->ifa_addr->sa_family == AF_INET && |
---|
1177 | ia->ia_addr.sin_addr.s_addr == |
---|
1178 | ifatoia(ifa)->ia_addr.sin_addr.s_addr) |
---|
1179 | count++; |
---|
1180 | } |
---|
1181 | IF_ADDR_RUNLOCK(SC2IFP(vh)); |
---|
1182 | } |
---|
1183 | } |
---|
1184 | return (count); |
---|
1185 | } |
---|
1186 | |
---|
1187 | int |
---|
1188 | carp_iamatch(struct ifnet *ifp, struct in_ifaddr *ia, |
---|
1189 | struct in_addr *isaddr, u_int8_t **enaddr) |
---|
1190 | { |
---|
1191 | struct carp_if *cif; |
---|
1192 | struct carp_softc *vh; |
---|
1193 | int index, count = 0; |
---|
1194 | struct ifaddr *ifa; |
---|
1195 | |
---|
1196 | cif = ifp->if_carp; |
---|
1197 | CARP_LOCK(cif); |
---|
1198 | |
---|
1199 | if (carp_opts[CARPCTL_ARPBALANCE]) { |
---|
1200 | /* |
---|
1201 | * XXX proof of concept implementation. |
---|
1202 | * We use the source ip to decide which virtual host should |
---|
1203 | * handle the request. If we're master of that virtual host, |
---|
1204 | * then we respond, otherwise, just drop the arp packet on |
---|
1205 | * the floor. |
---|
1206 | */ |
---|
1207 | count = carp_addrcount(cif, ia, CARP_COUNT_RUNNING); |
---|
1208 | if (count == 0) { |
---|
1209 | /* should never reach this */ |
---|
1210 | CARP_UNLOCK(cif); |
---|
1211 | return (0); |
---|
1212 | } |
---|
1213 | |
---|
1214 | /* this should be a hash, like pf_hash() */ |
---|
1215 | index = ntohl(isaddr->s_addr) % count; |
---|
1216 | count = 0; |
---|
1217 | |
---|
1218 | TAILQ_FOREACH(vh, &cif->vhif_vrs, sc_list) { |
---|
1219 | if ((SC2IFP(vh)->if_flags & IFF_UP) && |
---|
1220 | (SC2IFP(vh)->if_drv_flags & IFF_DRV_RUNNING)) { |
---|
1221 | IF_ADDR_RLOCK(SC2IFP(vh)); |
---|
1222 | TAILQ_FOREACH(ifa, &SC2IFP(vh)->if_addrlist, |
---|
1223 | ifa_list) { |
---|
1224 | if (ifa->ifa_addr->sa_family == |
---|
1225 | AF_INET && |
---|
1226 | ia->ia_addr.sin_addr.s_addr == |
---|
1227 | ifatoia(ifa)->ia_addr.sin_addr.s_addr) { |
---|
1228 | if (count == index) { |
---|
1229 | if (vh->sc_state == |
---|
1230 | MASTER) { |
---|
1231 | *enaddr = IF_LLADDR(vh->sc_ifp); |
---|
1232 | IF_ADDR_RUNLOCK(SC2IFP(vh)); |
---|
1233 | CARP_UNLOCK(cif); |
---|
1234 | return (1); |
---|
1235 | } else { |
---|
1236 | IF_ADDR_RUNLOCK(SC2IFP(vh)); |
---|
1237 | CARP_UNLOCK(cif); |
---|
1238 | return (0); |
---|
1239 | } |
---|
1240 | } |
---|
1241 | count++; |
---|
1242 | } |
---|
1243 | } |
---|
1244 | IF_ADDR_RUNLOCK(SC2IFP(vh)); |
---|
1245 | } |
---|
1246 | } |
---|
1247 | } else { |
---|
1248 | TAILQ_FOREACH(vh, &cif->vhif_vrs, sc_list) { |
---|
1249 | if ((SC2IFP(vh)->if_flags & IFF_UP) && |
---|
1250 | (SC2IFP(vh)->if_drv_flags & IFF_DRV_RUNNING) && |
---|
1251 | ia->ia_ifp == SC2IFP(vh) && |
---|
1252 | vh->sc_state == MASTER) { |
---|
1253 | *enaddr = IF_LLADDR(vh->sc_ifp); |
---|
1254 | CARP_UNLOCK(cif); |
---|
1255 | return (1); |
---|
1256 | } |
---|
1257 | } |
---|
1258 | } |
---|
1259 | CARP_UNLOCK(cif); |
---|
1260 | return (0); |
---|
1261 | } |
---|
1262 | #endif |
---|
1263 | |
---|
1264 | #ifdef INET6 |
---|
1265 | struct ifaddr * |
---|
1266 | carp_iamatch6(struct ifnet *ifp, struct in6_addr *taddr) |
---|
1267 | { |
---|
1268 | struct carp_if *cif; |
---|
1269 | struct carp_softc *vh; |
---|
1270 | struct ifaddr *ifa; |
---|
1271 | |
---|
1272 | cif = ifp->if_carp; |
---|
1273 | CARP_LOCK(cif); |
---|
1274 | TAILQ_FOREACH(vh, &cif->vhif_vrs, sc_list) { |
---|
1275 | IF_ADDR_RLOCK(SC2IFP(vh)); |
---|
1276 | TAILQ_FOREACH(ifa, &SC2IFP(vh)->if_addrlist, ifa_list) { |
---|
1277 | if (IN6_ARE_ADDR_EQUAL(taddr, |
---|
1278 | &ifatoia6(ifa)->ia_addr.sin6_addr) && |
---|
1279 | (SC2IFP(vh)->if_flags & IFF_UP) && |
---|
1280 | (SC2IFP(vh)->if_drv_flags & IFF_DRV_RUNNING) && |
---|
1281 | vh->sc_state == MASTER) { |
---|
1282 | ifa_ref(ifa); |
---|
1283 | IF_ADDR_RUNLOCK(SC2IFP(vh)); |
---|
1284 | CARP_UNLOCK(cif); |
---|
1285 | return (ifa); |
---|
1286 | } |
---|
1287 | } |
---|
1288 | IF_ADDR_RUNLOCK(SC2IFP(vh)); |
---|
1289 | } |
---|
1290 | CARP_UNLOCK(cif); |
---|
1291 | |
---|
1292 | return (NULL); |
---|
1293 | } |
---|
1294 | |
---|
1295 | caddr_t |
---|
1296 | carp_macmatch6(struct ifnet *ifp, struct mbuf *m, const struct in6_addr *taddr) |
---|
1297 | { |
---|
1298 | struct m_tag *mtag; |
---|
1299 | struct carp_if *cif; |
---|
1300 | struct carp_softc *sc; |
---|
1301 | struct ifaddr *ifa; |
---|
1302 | |
---|
1303 | cif = ifp->if_carp; |
---|
1304 | CARP_LOCK(cif); |
---|
1305 | TAILQ_FOREACH(sc, &cif->vhif_vrs, sc_list) { |
---|
1306 | IF_ADDR_RLOCK(SC2IFP(sc)); |
---|
1307 | TAILQ_FOREACH(ifa, &SC2IFP(sc)->if_addrlist, ifa_list) { |
---|
1308 | if (IN6_ARE_ADDR_EQUAL(taddr, |
---|
1309 | &ifatoia6(ifa)->ia_addr.sin6_addr) && |
---|
1310 | (SC2IFP(sc)->if_flags & IFF_UP) && |
---|
1311 | (SC2IFP(sc)->if_drv_flags & IFF_DRV_RUNNING)) { |
---|
1312 | struct ifnet *ifp = SC2IFP(sc); |
---|
1313 | mtag = m_tag_get(PACKET_TAG_CARP, |
---|
1314 | sizeof(struct ifnet *), M_NOWAIT); |
---|
1315 | if (mtag == NULL) { |
---|
1316 | /* better a bit than nothing */ |
---|
1317 | IF_ADDR_RUNLOCK(SC2IFP(sc)); |
---|
1318 | CARP_UNLOCK(cif); |
---|
1319 | return (IF_LLADDR(sc->sc_ifp)); |
---|
1320 | } |
---|
1321 | bcopy(&ifp, (caddr_t)(mtag + 1), |
---|
1322 | sizeof(struct ifnet *)); |
---|
1323 | m_tag_prepend(m, mtag); |
---|
1324 | |
---|
1325 | IF_ADDR_RUNLOCK(SC2IFP(sc)); |
---|
1326 | CARP_UNLOCK(cif); |
---|
1327 | return (IF_LLADDR(sc->sc_ifp)); |
---|
1328 | } |
---|
1329 | } |
---|
1330 | IF_ADDR_RUNLOCK(SC2IFP(sc)); |
---|
1331 | } |
---|
1332 | CARP_UNLOCK(cif); |
---|
1333 | |
---|
1334 | return (NULL); |
---|
1335 | } |
---|
1336 | #endif |
---|
1337 | |
---|
1338 | struct ifnet * |
---|
1339 | carp_forus(struct ifnet *ifp, u_char *dhost) |
---|
1340 | { |
---|
1341 | struct carp_if *cif; |
---|
1342 | struct carp_softc *vh; |
---|
1343 | u_int8_t *ena = dhost; |
---|
1344 | |
---|
1345 | if (ena[0] || ena[1] || ena[2] != 0x5e || ena[3] || ena[4] != 1) |
---|
1346 | return (NULL); |
---|
1347 | |
---|
1348 | cif = ifp->if_carp; |
---|
1349 | CARP_LOCK(cif); |
---|
1350 | TAILQ_FOREACH(vh, &cif->vhif_vrs, sc_list) |
---|
1351 | if ((SC2IFP(vh)->if_flags & IFF_UP) && |
---|
1352 | (SC2IFP(vh)->if_drv_flags & IFF_DRV_RUNNING) && |
---|
1353 | vh->sc_state == MASTER && |
---|
1354 | !bcmp(dhost, IF_LLADDR(vh->sc_ifp), ETHER_ADDR_LEN)) { |
---|
1355 | CARP_UNLOCK(cif); |
---|
1356 | return (SC2IFP(vh)); |
---|
1357 | } |
---|
1358 | |
---|
1359 | CARP_UNLOCK(cif); |
---|
1360 | return (NULL); |
---|
1361 | } |
---|
1362 | |
---|
1363 | static void |
---|
1364 | carp_master_down(void *v) |
---|
1365 | { |
---|
1366 | struct carp_softc *sc = v; |
---|
1367 | |
---|
1368 | CARP_SCLOCK(sc); |
---|
1369 | carp_master_down_locked(sc); |
---|
1370 | CARP_SCUNLOCK(sc); |
---|
1371 | } |
---|
1372 | |
---|
1373 | static void |
---|
1374 | carp_master_down_locked(struct carp_softc *sc) |
---|
1375 | { |
---|
1376 | if (sc->sc_carpdev) |
---|
1377 | CARP_SCLOCK_ASSERT(sc); |
---|
1378 | |
---|
1379 | switch (sc->sc_state) { |
---|
1380 | case INIT: |
---|
1381 | printf("%s: master_down event in INIT state\n", |
---|
1382 | SC2IFP(sc)->if_xname); |
---|
1383 | break; |
---|
1384 | case MASTER: |
---|
1385 | break; |
---|
1386 | case BACKUP: |
---|
1387 | carp_set_state(sc, MASTER); |
---|
1388 | carp_send_ad_locked(sc); |
---|
1389 | #ifdef INET |
---|
1390 | carp_send_arp(sc); |
---|
1391 | #endif |
---|
1392 | #ifdef INET6 |
---|
1393 | carp_send_na(sc); |
---|
1394 | #endif /* INET6 */ |
---|
1395 | carp_setrun(sc, 0); |
---|
1396 | carp_setroute(sc, RTM_ADD); |
---|
1397 | break; |
---|
1398 | } |
---|
1399 | } |
---|
1400 | |
---|
1401 | /* |
---|
1402 | * When in backup state, af indicates whether to reset the master down timer |
---|
1403 | * for v4 or v6. If it's set to zero, reset the ones which are already pending. |
---|
1404 | */ |
---|
1405 | static void |
---|
1406 | carp_setrun(struct carp_softc *sc, sa_family_t af) |
---|
1407 | { |
---|
1408 | struct timeval tv; |
---|
1409 | |
---|
1410 | if (sc->sc_carpdev == NULL) { |
---|
1411 | SC2IFP(sc)->if_drv_flags &= ~IFF_DRV_RUNNING; |
---|
1412 | carp_set_state(sc, INIT); |
---|
1413 | return; |
---|
1414 | } else |
---|
1415 | CARP_SCLOCK_ASSERT(sc); |
---|
1416 | |
---|
1417 | if (SC2IFP(sc)->if_flags & IFF_UP && |
---|
1418 | sc->sc_vhid > 0 && (sc->sc_naddrs || sc->sc_naddrs6) && |
---|
1419 | sc->sc_carpdev->if_link_state == LINK_STATE_UP) |
---|
1420 | SC2IFP(sc)->if_drv_flags |= IFF_DRV_RUNNING; |
---|
1421 | else { |
---|
1422 | SC2IFP(sc)->if_drv_flags &= ~IFF_DRV_RUNNING; |
---|
1423 | carp_setroute(sc, RTM_DELETE); |
---|
1424 | return; |
---|
1425 | } |
---|
1426 | |
---|
1427 | switch (sc->sc_state) { |
---|
1428 | case INIT: |
---|
1429 | CARP_LOG("%s: INIT -> BACKUP\n", SC2IFP(sc)->if_xname); |
---|
1430 | carp_set_state(sc, BACKUP); |
---|
1431 | carp_setroute(sc, RTM_DELETE); |
---|
1432 | carp_setrun(sc, 0); |
---|
1433 | break; |
---|
1434 | case BACKUP: |
---|
1435 | callout_stop(&sc->sc_ad_tmo); |
---|
1436 | tv.tv_sec = 3 * sc->sc_advbase; |
---|
1437 | tv.tv_usec = sc->sc_advskew * 1000000 / 256; |
---|
1438 | switch (af) { |
---|
1439 | #ifdef INET |
---|
1440 | case AF_INET: |
---|
1441 | callout_reset(&sc->sc_md_tmo, tvtohz(&tv), |
---|
1442 | carp_master_down, sc); |
---|
1443 | break; |
---|
1444 | #endif /* INET */ |
---|
1445 | #ifdef INET6 |
---|
1446 | case AF_INET6: |
---|
1447 | callout_reset(&sc->sc_md6_tmo, tvtohz(&tv), |
---|
1448 | carp_master_down, sc); |
---|
1449 | break; |
---|
1450 | #endif /* INET6 */ |
---|
1451 | default: |
---|
1452 | if (sc->sc_naddrs) |
---|
1453 | callout_reset(&sc->sc_md_tmo, tvtohz(&tv), |
---|
1454 | carp_master_down, sc); |
---|
1455 | if (sc->sc_naddrs6) |
---|
1456 | callout_reset(&sc->sc_md6_tmo, tvtohz(&tv), |
---|
1457 | carp_master_down, sc); |
---|
1458 | break; |
---|
1459 | } |
---|
1460 | break; |
---|
1461 | case MASTER: |
---|
1462 | tv.tv_sec = sc->sc_advbase; |
---|
1463 | tv.tv_usec = sc->sc_advskew * 1000000 / 256; |
---|
1464 | callout_reset(&sc->sc_ad_tmo, tvtohz(&tv), |
---|
1465 | carp_send_ad, sc); |
---|
1466 | break; |
---|
1467 | } |
---|
1468 | } |
---|
1469 | |
---|
1470 | #ifdef INET |
---|
1471 | static void |
---|
1472 | carp_multicast_cleanup(struct carp_softc *sc, int dofree) |
---|
1473 | { |
---|
1474 | struct ip_moptions *imo = &sc->sc_imo; |
---|
1475 | u_int16_t n = imo->imo_num_memberships; |
---|
1476 | |
---|
1477 | /* Clean up our own multicast memberships */ |
---|
1478 | while (n-- > 0) { |
---|
1479 | if (imo->imo_membership[n] != NULL) { |
---|
1480 | if (dofree) |
---|
1481 | in_delmulti(imo->imo_membership[n]); |
---|
1482 | imo->imo_membership[n] = NULL; |
---|
1483 | } |
---|
1484 | } |
---|
1485 | KASSERT(imo->imo_mfilters == NULL, |
---|
1486 | ("%s: imo_mfilters != NULL", __func__)); |
---|
1487 | imo->imo_num_memberships = 0; |
---|
1488 | imo->imo_multicast_ifp = NULL; |
---|
1489 | } |
---|
1490 | #endif |
---|
1491 | |
---|
1492 | #ifdef INET6 |
---|
1493 | static void |
---|
1494 | carp_multicast6_cleanup(struct carp_softc *sc, int dofree) |
---|
1495 | { |
---|
1496 | struct ip6_moptions *im6o = &sc->sc_im6o; |
---|
1497 | u_int16_t n = im6o->im6o_num_memberships; |
---|
1498 | |
---|
1499 | while (n-- > 0) { |
---|
1500 | if (im6o->im6o_membership[n] != NULL) { |
---|
1501 | if (dofree) |
---|
1502 | in6_mc_leave(im6o->im6o_membership[n], NULL); |
---|
1503 | im6o->im6o_membership[n] = NULL; |
---|
1504 | } |
---|
1505 | } |
---|
1506 | KASSERT(im6o->im6o_mfilters == NULL, |
---|
1507 | ("%s: im6o_mfilters != NULL", __func__)); |
---|
1508 | im6o->im6o_num_memberships = 0; |
---|
1509 | im6o->im6o_multicast_ifp = NULL; |
---|
1510 | } |
---|
1511 | #endif |
---|
1512 | |
---|
1513 | #ifdef INET |
---|
1514 | static int |
---|
1515 | carp_set_addr(struct carp_softc *sc, struct sockaddr_in *sin) |
---|
1516 | { |
---|
1517 | struct ifnet *ifp; |
---|
1518 | struct carp_if *cif; |
---|
1519 | struct in_ifaddr *ia, *ia_if; |
---|
1520 | struct ip_moptions *imo = &sc->sc_imo; |
---|
1521 | struct in_addr addr; |
---|
1522 | u_long iaddr = htonl(sin->sin_addr.s_addr); |
---|
1523 | int own, error; |
---|
1524 | |
---|
1525 | if (sin->sin_addr.s_addr == 0) { |
---|
1526 | if (!(SC2IFP(sc)->if_flags & IFF_UP)) |
---|
1527 | carp_set_state(sc, INIT); |
---|
1528 | if (sc->sc_naddrs) |
---|
1529 | SC2IFP(sc)->if_flags |= IFF_UP; |
---|
1530 | if (sc->sc_carpdev) |
---|
1531 | CARP_SCLOCK(sc); |
---|
1532 | carp_setrun(sc, 0); |
---|
1533 | if (sc->sc_carpdev) |
---|
1534 | CARP_SCUNLOCK(sc); |
---|
1535 | return (0); |
---|
1536 | } |
---|
1537 | |
---|
1538 | /* we have to do it by hands to check we won't match on us */ |
---|
1539 | ia_if = NULL; own = 0; |
---|
1540 | IN_IFADDR_RLOCK(); |
---|
1541 | TAILQ_FOREACH(ia, &V_in_ifaddrhead, ia_link) { |
---|
1542 | /* and, yeah, we need a multicast-capable iface too */ |
---|
1543 | if (ia->ia_ifp != SC2IFP(sc) && |
---|
1544 | (ia->ia_ifp->if_flags & IFF_MULTICAST) && |
---|
1545 | (iaddr & ia->ia_subnetmask) == ia->ia_subnet) { |
---|
1546 | if (!ia_if) |
---|
1547 | ia_if = ia; |
---|
1548 | if (sin->sin_addr.s_addr == |
---|
1549 | ia->ia_addr.sin_addr.s_addr) |
---|
1550 | own++; |
---|
1551 | } |
---|
1552 | } |
---|
1553 | |
---|
1554 | if (!ia_if) { |
---|
1555 | IN_IFADDR_RUNLOCK(); |
---|
1556 | return (EADDRNOTAVAIL); |
---|
1557 | } |
---|
1558 | |
---|
1559 | ia = ia_if; |
---|
1560 | ifa_ref(&ia->ia_ifa); |
---|
1561 | IN_IFADDR_RUNLOCK(); |
---|
1562 | |
---|
1563 | ifp = ia->ia_ifp; |
---|
1564 | |
---|
1565 | if (ifp == NULL || (ifp->if_flags & IFF_MULTICAST) == 0 || |
---|
1566 | (imo->imo_multicast_ifp && imo->imo_multicast_ifp != ifp)) { |
---|
1567 | ifa_free(&ia->ia_ifa); |
---|
1568 | return (EADDRNOTAVAIL); |
---|
1569 | } |
---|
1570 | |
---|
1571 | if (imo->imo_num_memberships == 0) { |
---|
1572 | addr.s_addr = htonl(INADDR_CARP_GROUP); |
---|
1573 | if ((imo->imo_membership[0] = in_addmulti(&addr, ifp)) == |
---|
1574 | NULL) { |
---|
1575 | ifa_free(&ia->ia_ifa); |
---|
1576 | return (ENOBUFS); |
---|
1577 | } |
---|
1578 | imo->imo_num_memberships++; |
---|
1579 | imo->imo_multicast_ifp = ifp; |
---|
1580 | imo->imo_multicast_ttl = CARP_DFLTTL; |
---|
1581 | imo->imo_multicast_loop = 0; |
---|
1582 | } |
---|
1583 | |
---|
1584 | if (!ifp->if_carp) { |
---|
1585 | |
---|
1586 | cif = malloc(sizeof(*cif), M_CARP, |
---|
1587 | M_WAITOK|M_ZERO); |
---|
1588 | if (!cif) { |
---|
1589 | error = ENOBUFS; |
---|
1590 | goto cleanup; |
---|
1591 | } |
---|
1592 | if ((error = ifpromisc(ifp, 1))) { |
---|
1593 | free(cif, M_CARP); |
---|
1594 | goto cleanup; |
---|
1595 | } |
---|
1596 | |
---|
1597 | CARP_LOCK_INIT(cif); |
---|
1598 | CARP_LOCK(cif); |
---|
1599 | cif->vhif_ifp = ifp; |
---|
1600 | TAILQ_INIT(&cif->vhif_vrs); |
---|
1601 | ifp->if_carp = cif; |
---|
1602 | |
---|
1603 | } else { |
---|
1604 | struct carp_softc *vr; |
---|
1605 | |
---|
1606 | cif = (struct carp_if *)ifp->if_carp; |
---|
1607 | CARP_LOCK(cif); |
---|
1608 | TAILQ_FOREACH(vr, &cif->vhif_vrs, sc_list) |
---|
1609 | if (vr != sc && vr->sc_vhid == sc->sc_vhid) { |
---|
1610 | CARP_UNLOCK(cif); |
---|
1611 | error = EEXIST; |
---|
1612 | goto cleanup; |
---|
1613 | } |
---|
1614 | } |
---|
1615 | sc->sc_ia = ia; |
---|
1616 | sc->sc_carpdev = ifp; |
---|
1617 | |
---|
1618 | { /* XXX prevent endless loop if already in queue */ |
---|
1619 | struct carp_softc *vr, *after = NULL; |
---|
1620 | int myself = 0; |
---|
1621 | cif = (struct carp_if *)ifp->if_carp; |
---|
1622 | |
---|
1623 | /* XXX: cif should not change, right? So we still hold the lock */ |
---|
1624 | CARP_LOCK_ASSERT(cif); |
---|
1625 | |
---|
1626 | TAILQ_FOREACH(vr, &cif->vhif_vrs, sc_list) { |
---|
1627 | if (vr == sc) |
---|
1628 | myself = 1; |
---|
1629 | if (vr->sc_vhid < sc->sc_vhid) |
---|
1630 | after = vr; |
---|
1631 | } |
---|
1632 | |
---|
1633 | if (!myself) { |
---|
1634 | /* We're trying to keep things in order */ |
---|
1635 | if (after == NULL) { |
---|
1636 | TAILQ_INSERT_TAIL(&cif->vhif_vrs, sc, sc_list); |
---|
1637 | } else { |
---|
1638 | TAILQ_INSERT_AFTER(&cif->vhif_vrs, after, sc, sc_list); |
---|
1639 | } |
---|
1640 | cif->vhif_nvrs++; |
---|
1641 | } |
---|
1642 | } |
---|
1643 | |
---|
1644 | sc->sc_naddrs++; |
---|
1645 | SC2IFP(sc)->if_flags |= IFF_UP; |
---|
1646 | if (own) |
---|
1647 | sc->sc_advskew = 0; |
---|
1648 | carp_sc_state_locked(sc); |
---|
1649 | carp_setrun(sc, 0); |
---|
1650 | |
---|
1651 | CARP_UNLOCK(cif); |
---|
1652 | ifa_free(&ia->ia_ifa); /* XXXRW: should hold reference for softc. */ |
---|
1653 | |
---|
1654 | return (0); |
---|
1655 | |
---|
1656 | cleanup: |
---|
1657 | in_delmulti(imo->imo_membership[--imo->imo_num_memberships]); |
---|
1658 | ifa_free(&ia->ia_ifa); |
---|
1659 | return (error); |
---|
1660 | } |
---|
1661 | |
---|
1662 | static int |
---|
1663 | carp_del_addr(struct carp_softc *sc, struct sockaddr_in *sin) |
---|
1664 | { |
---|
1665 | int error = 0; |
---|
1666 | |
---|
1667 | if (!--sc->sc_naddrs) { |
---|
1668 | struct carp_if *cif = (struct carp_if *)sc->sc_carpdev->if_carp; |
---|
1669 | struct ip_moptions *imo = &sc->sc_imo; |
---|
1670 | |
---|
1671 | CARP_LOCK(cif); |
---|
1672 | callout_stop(&sc->sc_ad_tmo); |
---|
1673 | SC2IFP(sc)->if_flags &= ~IFF_UP; |
---|
1674 | SC2IFP(sc)->if_drv_flags &= ~IFF_DRV_RUNNING; |
---|
1675 | sc->sc_vhid = -1; |
---|
1676 | in_delmulti(imo->imo_membership[--imo->imo_num_memberships]); |
---|
1677 | imo->imo_multicast_ifp = NULL; |
---|
1678 | TAILQ_REMOVE(&cif->vhif_vrs, sc, sc_list); |
---|
1679 | if (!--cif->vhif_nvrs) { |
---|
1680 | sc->sc_carpdev->if_carp = NULL; |
---|
1681 | CARP_LOCK_DESTROY(cif); |
---|
1682 | free(cif, M_CARP); |
---|
1683 | } else { |
---|
1684 | CARP_UNLOCK(cif); |
---|
1685 | } |
---|
1686 | } |
---|
1687 | |
---|
1688 | return (error); |
---|
1689 | } |
---|
1690 | #endif |
---|
1691 | |
---|
1692 | #ifdef INET6 |
---|
1693 | static int |
---|
1694 | carp_set_addr6(struct carp_softc *sc, struct sockaddr_in6 *sin6) |
---|
1695 | { |
---|
1696 | struct ifnet *ifp; |
---|
1697 | struct carp_if *cif; |
---|
1698 | struct in6_ifaddr *ia, *ia_if; |
---|
1699 | struct ip6_moptions *im6o = &sc->sc_im6o; |
---|
1700 | struct in6_addr in6; |
---|
1701 | int own, error; |
---|
1702 | |
---|
1703 | error = 0; |
---|
1704 | |
---|
1705 | if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) { |
---|
1706 | if (!(SC2IFP(sc)->if_flags & IFF_UP)) |
---|
1707 | carp_set_state(sc, INIT); |
---|
1708 | if (sc->sc_naddrs6) |
---|
1709 | SC2IFP(sc)->if_flags |= IFF_UP; |
---|
1710 | if (sc->sc_carpdev) |
---|
1711 | CARP_SCLOCK(sc); |
---|
1712 | carp_setrun(sc, 0); |
---|
1713 | if (sc->sc_carpdev) |
---|
1714 | CARP_SCUNLOCK(sc); |
---|
1715 | return (0); |
---|
1716 | } |
---|
1717 | |
---|
1718 | /* we have to do it by hands to check we won't match on us */ |
---|
1719 | ia_if = NULL; own = 0; |
---|
1720 | IN6_IFADDR_RLOCK(); |
---|
1721 | TAILQ_FOREACH(ia, &V_in6_ifaddrhead, ia_link) { |
---|
1722 | int i; |
---|
1723 | |
---|
1724 | for (i = 0; i < 4; i++) { |
---|
1725 | if ((sin6->sin6_addr.s6_addr32[i] & |
---|
1726 | ia->ia_prefixmask.sin6_addr.s6_addr32[i]) != |
---|
1727 | (ia->ia_addr.sin6_addr.s6_addr32[i] & |
---|
1728 | ia->ia_prefixmask.sin6_addr.s6_addr32[i])) |
---|
1729 | break; |
---|
1730 | } |
---|
1731 | /* and, yeah, we need a multicast-capable iface too */ |
---|
1732 | if (ia->ia_ifp != SC2IFP(sc) && |
---|
1733 | (ia->ia_ifp->if_flags & IFF_MULTICAST) && |
---|
1734 | (i == 4)) { |
---|
1735 | if (!ia_if) |
---|
1736 | ia_if = ia; |
---|
1737 | if (IN6_ARE_ADDR_EQUAL(&sin6->sin6_addr, |
---|
1738 | &ia->ia_addr.sin6_addr)) |
---|
1739 | own++; |
---|
1740 | } |
---|
1741 | } |
---|
1742 | |
---|
1743 | if (!ia_if) { |
---|
1744 | IN6_IFADDR_RUNLOCK(); |
---|
1745 | return (EADDRNOTAVAIL); |
---|
1746 | } |
---|
1747 | ia = ia_if; |
---|
1748 | ifa_ref(&ia->ia_ifa); |
---|
1749 | IN6_IFADDR_RUNLOCK(); |
---|
1750 | ifp = ia->ia_ifp; |
---|
1751 | |
---|
1752 | if (ifp == NULL || (ifp->if_flags & IFF_MULTICAST) == 0 || |
---|
1753 | (im6o->im6o_multicast_ifp && im6o->im6o_multicast_ifp != ifp)) { |
---|
1754 | ifa_free(&ia->ia_ifa); |
---|
1755 | return (EADDRNOTAVAIL); |
---|
1756 | } |
---|
1757 | |
---|
1758 | if (!sc->sc_naddrs6) { |
---|
1759 | struct in6_multi *in6m; |
---|
1760 | |
---|
1761 | im6o->im6o_multicast_ifp = ifp; |
---|
1762 | |
---|
1763 | /* join CARP multicast address */ |
---|
1764 | bzero(&in6, sizeof(in6)); |
---|
1765 | in6.s6_addr16[0] = htons(0xff02); |
---|
1766 | in6.s6_addr8[15] = 0x12; |
---|
1767 | if (in6_setscope(&in6, ifp, NULL) != 0) |
---|
1768 | goto cleanup; |
---|
1769 | in6m = NULL; |
---|
1770 | error = in6_mc_join(ifp, &in6, NULL, &in6m, 0); |
---|
1771 | if (error) |
---|
1772 | goto cleanup; |
---|
1773 | im6o->im6o_membership[0] = in6m; |
---|
1774 | im6o->im6o_num_memberships++; |
---|
1775 | |
---|
1776 | /* join solicited multicast address */ |
---|
1777 | bzero(&in6, sizeof(in6)); |
---|
1778 | in6.s6_addr16[0] = htons(0xff02); |
---|
1779 | in6.s6_addr32[1] = 0; |
---|
1780 | in6.s6_addr32[2] = htonl(1); |
---|
1781 | in6.s6_addr32[3] = sin6->sin6_addr.s6_addr32[3]; |
---|
1782 | in6.s6_addr8[12] = 0xff; |
---|
1783 | if (in6_setscope(&in6, ifp, NULL) != 0) |
---|
1784 | goto cleanup; |
---|
1785 | in6m = NULL; |
---|
1786 | error = in6_mc_join(ifp, &in6, NULL, &in6m, 0); |
---|
1787 | if (error) |
---|
1788 | goto cleanup; |
---|
1789 | im6o->im6o_membership[1] = in6m; |
---|
1790 | im6o->im6o_num_memberships++; |
---|
1791 | } |
---|
1792 | |
---|
1793 | if (!ifp->if_carp) { |
---|
1794 | cif = malloc(sizeof(*cif), M_CARP, |
---|
1795 | M_WAITOK|M_ZERO); |
---|
1796 | if (!cif) { |
---|
1797 | error = ENOBUFS; |
---|
1798 | goto cleanup; |
---|
1799 | } |
---|
1800 | if ((error = ifpromisc(ifp, 1))) { |
---|
1801 | free(cif, M_CARP); |
---|
1802 | goto cleanup; |
---|
1803 | } |
---|
1804 | |
---|
1805 | CARP_LOCK_INIT(cif); |
---|
1806 | CARP_LOCK(cif); |
---|
1807 | cif->vhif_ifp = ifp; |
---|
1808 | TAILQ_INIT(&cif->vhif_vrs); |
---|
1809 | ifp->if_carp = cif; |
---|
1810 | |
---|
1811 | } else { |
---|
1812 | struct carp_softc *vr; |
---|
1813 | |
---|
1814 | cif = (struct carp_if *)ifp->if_carp; |
---|
1815 | CARP_LOCK(cif); |
---|
1816 | TAILQ_FOREACH(vr, &cif->vhif_vrs, sc_list) |
---|
1817 | if (vr != sc && vr->sc_vhid == sc->sc_vhid) { |
---|
1818 | CARP_UNLOCK(cif); |
---|
1819 | error = EINVAL; |
---|
1820 | goto cleanup; |
---|
1821 | } |
---|
1822 | } |
---|
1823 | sc->sc_ia6 = ia; |
---|
1824 | sc->sc_carpdev = ifp; |
---|
1825 | |
---|
1826 | { /* XXX prevent endless loop if already in queue */ |
---|
1827 | struct carp_softc *vr, *after = NULL; |
---|
1828 | int myself = 0; |
---|
1829 | cif = (struct carp_if *)ifp->if_carp; |
---|
1830 | CARP_LOCK_ASSERT(cif); |
---|
1831 | |
---|
1832 | TAILQ_FOREACH(vr, &cif->vhif_vrs, sc_list) { |
---|
1833 | if (vr == sc) |
---|
1834 | myself = 1; |
---|
1835 | if (vr->sc_vhid < sc->sc_vhid) |
---|
1836 | after = vr; |
---|
1837 | } |
---|
1838 | |
---|
1839 | if (!myself) { |
---|
1840 | /* We're trying to keep things in order */ |
---|
1841 | if (after == NULL) { |
---|
1842 | TAILQ_INSERT_TAIL(&cif->vhif_vrs, sc, sc_list); |
---|
1843 | } else { |
---|
1844 | TAILQ_INSERT_AFTER(&cif->vhif_vrs, after, sc, sc_list); |
---|
1845 | } |
---|
1846 | cif->vhif_nvrs++; |
---|
1847 | } |
---|
1848 | } |
---|
1849 | |
---|
1850 | sc->sc_naddrs6++; |
---|
1851 | SC2IFP(sc)->if_flags |= IFF_UP; |
---|
1852 | if (own) |
---|
1853 | sc->sc_advskew = 0; |
---|
1854 | carp_sc_state_locked(sc); |
---|
1855 | carp_setrun(sc, 0); |
---|
1856 | |
---|
1857 | CARP_UNLOCK(cif); |
---|
1858 | ifa_free(&ia->ia_ifa); /* XXXRW: should hold reference for softc. */ |
---|
1859 | |
---|
1860 | return (0); |
---|
1861 | |
---|
1862 | cleanup: |
---|
1863 | if (!sc->sc_naddrs6) |
---|
1864 | carp_multicast6_cleanup(sc, 1); |
---|
1865 | ifa_free(&ia->ia_ifa); |
---|
1866 | return (error); |
---|
1867 | } |
---|
1868 | |
---|
1869 | static int |
---|
1870 | carp_del_addr6(struct carp_softc *sc, struct sockaddr_in6 *sin6) |
---|
1871 | { |
---|
1872 | int error = 0; |
---|
1873 | |
---|
1874 | if (!--sc->sc_naddrs6) { |
---|
1875 | struct carp_if *cif = (struct carp_if *)sc->sc_carpdev->if_carp; |
---|
1876 | |
---|
1877 | CARP_LOCK(cif); |
---|
1878 | callout_stop(&sc->sc_ad_tmo); |
---|
1879 | SC2IFP(sc)->if_flags &= ~IFF_UP; |
---|
1880 | SC2IFP(sc)->if_drv_flags &= ~IFF_DRV_RUNNING; |
---|
1881 | sc->sc_vhid = -1; |
---|
1882 | carp_multicast6_cleanup(sc, 1); |
---|
1883 | TAILQ_REMOVE(&cif->vhif_vrs, sc, sc_list); |
---|
1884 | if (!--cif->vhif_nvrs) { |
---|
1885 | CARP_LOCK_DESTROY(cif); |
---|
1886 | sc->sc_carpdev->if_carp = NULL; |
---|
1887 | free(cif, M_CARP); |
---|
1888 | } else |
---|
1889 | CARP_UNLOCK(cif); |
---|
1890 | } |
---|
1891 | |
---|
1892 | return (error); |
---|
1893 | } |
---|
1894 | #endif /* INET6 */ |
---|
1895 | |
---|
1896 | static int |
---|
1897 | carp_ioctl(struct ifnet *ifp, u_long cmd, caddr_t addr) |
---|
1898 | { |
---|
1899 | struct carp_softc *sc = ifp->if_softc, *vr; |
---|
1900 | struct carpreq carpr; |
---|
1901 | struct ifaddr *ifa; |
---|
1902 | struct ifreq *ifr; |
---|
1903 | struct ifaliasreq *ifra; |
---|
1904 | int locked = 0, error = 0; |
---|
1905 | |
---|
1906 | ifa = (struct ifaddr *)addr; |
---|
1907 | ifra = (struct ifaliasreq *)addr; |
---|
1908 | ifr = (struct ifreq *)addr; |
---|
1909 | |
---|
1910 | switch (cmd) { |
---|
1911 | case SIOCSIFADDR: |
---|
1912 | switch (ifa->ifa_addr->sa_family) { |
---|
1913 | #ifdef INET |
---|
1914 | case AF_INET: |
---|
1915 | SC2IFP(sc)->if_flags |= IFF_UP; |
---|
1916 | bcopy(ifa->ifa_addr, ifa->ifa_dstaddr, |
---|
1917 | sizeof(struct sockaddr)); |
---|
1918 | error = carp_set_addr(sc, satosin(ifa->ifa_addr)); |
---|
1919 | break; |
---|
1920 | #endif /* INET */ |
---|
1921 | #ifdef INET6 |
---|
1922 | case AF_INET6: |
---|
1923 | SC2IFP(sc)->if_flags |= IFF_UP; |
---|
1924 | error = carp_set_addr6(sc, satosin6(ifa->ifa_addr)); |
---|
1925 | break; |
---|
1926 | #endif /* INET6 */ |
---|
1927 | default: |
---|
1928 | error = EAFNOSUPPORT; |
---|
1929 | break; |
---|
1930 | } |
---|
1931 | break; |
---|
1932 | |
---|
1933 | case SIOCAIFADDR: |
---|
1934 | switch (ifa->ifa_addr->sa_family) { |
---|
1935 | #ifdef INET |
---|
1936 | case AF_INET: |
---|
1937 | SC2IFP(sc)->if_flags |= IFF_UP; |
---|
1938 | bcopy(ifa->ifa_addr, ifa->ifa_dstaddr, |
---|
1939 | sizeof(struct sockaddr)); |
---|
1940 | error = carp_set_addr(sc, satosin(&ifra->ifra_addr)); |
---|
1941 | break; |
---|
1942 | #endif /* INET */ |
---|
1943 | #ifdef INET6 |
---|
1944 | case AF_INET6: |
---|
1945 | SC2IFP(sc)->if_flags |= IFF_UP; |
---|
1946 | error = carp_set_addr6(sc, satosin6(&ifra->ifra_addr)); |
---|
1947 | break; |
---|
1948 | #endif /* INET6 */ |
---|
1949 | default: |
---|
1950 | error = EAFNOSUPPORT; |
---|
1951 | break; |
---|
1952 | } |
---|
1953 | break; |
---|
1954 | |
---|
1955 | case SIOCDIFADDR: |
---|
1956 | switch (ifa->ifa_addr->sa_family) { |
---|
1957 | #ifdef INET |
---|
1958 | case AF_INET: |
---|
1959 | error = carp_del_addr(sc, satosin(&ifra->ifra_addr)); |
---|
1960 | break; |
---|
1961 | #endif /* INET */ |
---|
1962 | #ifdef INET6 |
---|
1963 | case AF_INET6: |
---|
1964 | error = carp_del_addr6(sc, satosin6(&ifra->ifra_addr)); |
---|
1965 | break; |
---|
1966 | #endif /* INET6 */ |
---|
1967 | default: |
---|
1968 | error = EAFNOSUPPORT; |
---|
1969 | break; |
---|
1970 | } |
---|
1971 | break; |
---|
1972 | |
---|
1973 | case SIOCSIFFLAGS: |
---|
1974 | if (sc->sc_carpdev) { |
---|
1975 | locked = 1; |
---|
1976 | CARP_SCLOCK(sc); |
---|
1977 | } |
---|
1978 | if (sc->sc_state != INIT && !(ifr->ifr_flags & IFF_UP)) { |
---|
1979 | callout_stop(&sc->sc_ad_tmo); |
---|
1980 | callout_stop(&sc->sc_md_tmo); |
---|
1981 | callout_stop(&sc->sc_md6_tmo); |
---|
1982 | if (sc->sc_state == MASTER) |
---|
1983 | carp_send_ad_locked(sc); |
---|
1984 | carp_set_state(sc, INIT); |
---|
1985 | carp_setrun(sc, 0); |
---|
1986 | } else if (sc->sc_state == INIT && (ifr->ifr_flags & IFF_UP)) { |
---|
1987 | SC2IFP(sc)->if_flags |= IFF_UP; |
---|
1988 | carp_setrun(sc, 0); |
---|
1989 | } |
---|
1990 | break; |
---|
1991 | |
---|
1992 | case SIOCSVH: |
---|
1993 | error = priv_check(curthread, PRIV_NETINET_CARP); |
---|
1994 | if (error) |
---|
1995 | break; |
---|
1996 | if ((error = copyin(ifr->ifr_data, &carpr, sizeof carpr))) |
---|
1997 | break; |
---|
1998 | error = 1; |
---|
1999 | if (sc->sc_carpdev) { |
---|
2000 | locked = 1; |
---|
2001 | CARP_SCLOCK(sc); |
---|
2002 | } |
---|
2003 | if (sc->sc_state != INIT && carpr.carpr_state != sc->sc_state) { |
---|
2004 | switch (carpr.carpr_state) { |
---|
2005 | case BACKUP: |
---|
2006 | callout_stop(&sc->sc_ad_tmo); |
---|
2007 | carp_set_state(sc, BACKUP); |
---|
2008 | carp_setrun(sc, 0); |
---|
2009 | carp_setroute(sc, RTM_DELETE); |
---|
2010 | break; |
---|
2011 | case MASTER: |
---|
2012 | carp_master_down_locked(sc); |
---|
2013 | break; |
---|
2014 | default: |
---|
2015 | break; |
---|
2016 | } |
---|
2017 | } |
---|
2018 | if (carpr.carpr_vhid > 0) { |
---|
2019 | if (carpr.carpr_vhid > 255) { |
---|
2020 | error = EINVAL; |
---|
2021 | break; |
---|
2022 | } |
---|
2023 | if (sc->sc_carpdev) { |
---|
2024 | struct carp_if *cif; |
---|
2025 | cif = (struct carp_if *)sc->sc_carpdev->if_carp; |
---|
2026 | TAILQ_FOREACH(vr, &cif->vhif_vrs, sc_list) |
---|
2027 | if (vr != sc && |
---|
2028 | vr->sc_vhid == carpr.carpr_vhid) { |
---|
2029 | error = EEXIST; |
---|
2030 | break; |
---|
2031 | } |
---|
2032 | if (error == EEXIST) |
---|
2033 | break; |
---|
2034 | } |
---|
2035 | sc->sc_vhid = carpr.carpr_vhid; |
---|
2036 | IF_LLADDR(sc->sc_ifp)[0] = 0; |
---|
2037 | IF_LLADDR(sc->sc_ifp)[1] = 0; |
---|
2038 | IF_LLADDR(sc->sc_ifp)[2] = 0x5e; |
---|
2039 | IF_LLADDR(sc->sc_ifp)[3] = 0; |
---|
2040 | IF_LLADDR(sc->sc_ifp)[4] = 1; |
---|
2041 | IF_LLADDR(sc->sc_ifp)[5] = sc->sc_vhid; |
---|
2042 | error--; |
---|
2043 | } |
---|
2044 | if (carpr.carpr_advbase > 0 || carpr.carpr_advskew > 0) { |
---|
2045 | if (carpr.carpr_advskew >= 255) { |
---|
2046 | error = EINVAL; |
---|
2047 | break; |
---|
2048 | } |
---|
2049 | if (carpr.carpr_advbase > 255) { |
---|
2050 | error = EINVAL; |
---|
2051 | break; |
---|
2052 | } |
---|
2053 | sc->sc_advbase = carpr.carpr_advbase; |
---|
2054 | sc->sc_advskew = carpr.carpr_advskew; |
---|
2055 | error--; |
---|
2056 | } |
---|
2057 | bcopy(carpr.carpr_key, sc->sc_key, sizeof(sc->sc_key)); |
---|
2058 | if (error > 0) |
---|
2059 | error = EINVAL; |
---|
2060 | else { |
---|
2061 | error = 0; |
---|
2062 | carp_setrun(sc, 0); |
---|
2063 | } |
---|
2064 | break; |
---|
2065 | |
---|
2066 | case SIOCGVH: |
---|
2067 | /* XXX: lockless read */ |
---|
2068 | bzero(&carpr, sizeof(carpr)); |
---|
2069 | carpr.carpr_state = sc->sc_state; |
---|
2070 | carpr.carpr_vhid = sc->sc_vhid; |
---|
2071 | carpr.carpr_advbase = sc->sc_advbase; |
---|
2072 | carpr.carpr_advskew = sc->sc_advskew; |
---|
2073 | error = priv_check(curthread, PRIV_NETINET_CARP); |
---|
2074 | if (error == 0) |
---|
2075 | bcopy(sc->sc_key, carpr.carpr_key, |
---|
2076 | sizeof(carpr.carpr_key)); |
---|
2077 | error = copyout(&carpr, ifr->ifr_data, sizeof(carpr)); |
---|
2078 | break; |
---|
2079 | |
---|
2080 | default: |
---|
2081 | error = EINVAL; |
---|
2082 | } |
---|
2083 | |
---|
2084 | if (locked) |
---|
2085 | CARP_SCUNLOCK(sc); |
---|
2086 | |
---|
2087 | carp_hmac_prepare(sc); |
---|
2088 | |
---|
2089 | return (error); |
---|
2090 | } |
---|
2091 | |
---|
2092 | /* |
---|
2093 | * XXX: this is looutput. We should eventually use it from there. |
---|
2094 | */ |
---|
2095 | static int |
---|
2096 | carp_looutput(struct ifnet *ifp, struct mbuf *m, struct sockaddr *dst, |
---|
2097 | struct route *ro) |
---|
2098 | { |
---|
2099 | u_int32_t af; |
---|
2100 | struct rtentry *rt = NULL; |
---|
2101 | |
---|
2102 | M_ASSERTPKTHDR(m); /* check if we have the packet header */ |
---|
2103 | |
---|
2104 | if (ro != NULL) |
---|
2105 | rt = ro->ro_rt; |
---|
2106 | if (rt && rt->rt_flags & (RTF_REJECT|RTF_BLACKHOLE)) { |
---|
2107 | m_freem(m); |
---|
2108 | return (rt->rt_flags & RTF_BLACKHOLE ? 0 : |
---|
2109 | rt->rt_flags & RTF_HOST ? EHOSTUNREACH : ENETUNREACH); |
---|
2110 | } |
---|
2111 | |
---|
2112 | ifp->if_opackets++; |
---|
2113 | ifp->if_obytes += m->m_pkthdr.len; |
---|
2114 | |
---|
2115 | /* BPF writes need to be handled specially. */ |
---|
2116 | if (dst->sa_family == AF_UNSPEC) { |
---|
2117 | bcopy(dst->sa_data, &af, sizeof(af)); |
---|
2118 | dst->sa_family = af; |
---|
2119 | } |
---|
2120 | |
---|
2121 | #if 1 /* XXX */ |
---|
2122 | switch (dst->sa_family) { |
---|
2123 | case AF_INET: |
---|
2124 | case AF_INET6: |
---|
2125 | case AF_IPX: |
---|
2126 | case AF_APPLETALK: |
---|
2127 | break; |
---|
2128 | default: |
---|
2129 | printf("carp_looutput: af=%d unexpected\n", dst->sa_family); |
---|
2130 | m_freem(m); |
---|
2131 | return (EAFNOSUPPORT); |
---|
2132 | } |
---|
2133 | #endif |
---|
2134 | return(if_simloop(ifp, m, dst->sa_family, 0)); |
---|
2135 | } |
---|
2136 | |
---|
2137 | /* |
---|
2138 | * Start output on carp interface. This function should never be called. |
---|
2139 | */ |
---|
2140 | static void |
---|
2141 | carp_start(struct ifnet *ifp) |
---|
2142 | { |
---|
2143 | #ifdef DEBUG |
---|
2144 | printf("%s: start called\n", ifp->if_xname); |
---|
2145 | #endif |
---|
2146 | } |
---|
2147 | |
---|
2148 | int |
---|
2149 | carp_output(struct ifnet *ifp, struct mbuf *m, struct sockaddr *sa, |
---|
2150 | struct rtentry *rt) |
---|
2151 | { |
---|
2152 | struct m_tag *mtag; |
---|
2153 | struct carp_softc *sc; |
---|
2154 | struct ifnet *carp_ifp; |
---|
2155 | |
---|
2156 | if (!sa) |
---|
2157 | return (0); |
---|
2158 | |
---|
2159 | switch (sa->sa_family) { |
---|
2160 | #ifdef INET |
---|
2161 | case AF_INET: |
---|
2162 | break; |
---|
2163 | #endif /* INET */ |
---|
2164 | #ifdef INET6 |
---|
2165 | case AF_INET6: |
---|
2166 | break; |
---|
2167 | #endif /* INET6 */ |
---|
2168 | default: |
---|
2169 | return (0); |
---|
2170 | } |
---|
2171 | |
---|
2172 | mtag = m_tag_find(m, PACKET_TAG_CARP, NULL); |
---|
2173 | if (mtag == NULL) |
---|
2174 | return (0); |
---|
2175 | |
---|
2176 | bcopy(mtag + 1, &carp_ifp, sizeof(struct ifnet *)); |
---|
2177 | sc = carp_ifp->if_softc; |
---|
2178 | |
---|
2179 | /* Set the source MAC address to Virtual Router MAC Address */ |
---|
2180 | switch (ifp->if_type) { |
---|
2181 | case IFT_ETHER: |
---|
2182 | case IFT_L2VLAN: { |
---|
2183 | struct ether_header *eh; |
---|
2184 | |
---|
2185 | eh = mtod(m, struct ether_header *); |
---|
2186 | eh->ether_shost[0] = 0; |
---|
2187 | eh->ether_shost[1] = 0; |
---|
2188 | eh->ether_shost[2] = 0x5e; |
---|
2189 | eh->ether_shost[3] = 0; |
---|
2190 | eh->ether_shost[4] = 1; |
---|
2191 | eh->ether_shost[5] = sc->sc_vhid; |
---|
2192 | } |
---|
2193 | break; |
---|
2194 | case IFT_FDDI: { |
---|
2195 | struct fddi_header *fh; |
---|
2196 | |
---|
2197 | fh = mtod(m, struct fddi_header *); |
---|
2198 | fh->fddi_shost[0] = 0; |
---|
2199 | fh->fddi_shost[1] = 0; |
---|
2200 | fh->fddi_shost[2] = 0x5e; |
---|
2201 | fh->fddi_shost[3] = 0; |
---|
2202 | fh->fddi_shost[4] = 1; |
---|
2203 | fh->fddi_shost[5] = sc->sc_vhid; |
---|
2204 | } |
---|
2205 | break; |
---|
2206 | case IFT_ISO88025: { |
---|
2207 | struct iso88025_header *th; |
---|
2208 | th = mtod(m, struct iso88025_header *); |
---|
2209 | th->iso88025_shost[0] = 3; |
---|
2210 | th->iso88025_shost[1] = 0; |
---|
2211 | th->iso88025_shost[2] = 0x40 >> (sc->sc_vhid - 1); |
---|
2212 | th->iso88025_shost[3] = 0x40000 >> (sc->sc_vhid - 1); |
---|
2213 | th->iso88025_shost[4] = 0; |
---|
2214 | th->iso88025_shost[5] = 0; |
---|
2215 | } |
---|
2216 | break; |
---|
2217 | default: |
---|
2218 | printf("%s: carp is not supported for this interface type\n", |
---|
2219 | ifp->if_xname); |
---|
2220 | return (EOPNOTSUPP); |
---|
2221 | } |
---|
2222 | |
---|
2223 | return (0); |
---|
2224 | } |
---|
2225 | |
---|
2226 | static void |
---|
2227 | carp_set_state(struct carp_softc *sc, int state) |
---|
2228 | { |
---|
2229 | int link_state; |
---|
2230 | |
---|
2231 | if (sc->sc_carpdev) |
---|
2232 | CARP_SCLOCK_ASSERT(sc); |
---|
2233 | |
---|
2234 | if (sc->sc_state == state) |
---|
2235 | return; |
---|
2236 | |
---|
2237 | sc->sc_state = state; |
---|
2238 | switch (state) { |
---|
2239 | case BACKUP: |
---|
2240 | link_state = LINK_STATE_DOWN; |
---|
2241 | break; |
---|
2242 | case MASTER: |
---|
2243 | link_state = LINK_STATE_UP; |
---|
2244 | break; |
---|
2245 | default: |
---|
2246 | link_state = LINK_STATE_UNKNOWN; |
---|
2247 | break; |
---|
2248 | } |
---|
2249 | if_link_state_change(SC2IFP(sc), link_state); |
---|
2250 | } |
---|
2251 | |
---|
2252 | void |
---|
2253 | carp_carpdev_state(struct ifnet *ifp) |
---|
2254 | { |
---|
2255 | struct carp_if *cif; |
---|
2256 | |
---|
2257 | cif = ifp->if_carp; |
---|
2258 | CARP_LOCK(cif); |
---|
2259 | carp_carpdev_state_locked(cif); |
---|
2260 | CARP_UNLOCK(cif); |
---|
2261 | } |
---|
2262 | |
---|
2263 | static void |
---|
2264 | carp_carpdev_state_locked(struct carp_if *cif) |
---|
2265 | { |
---|
2266 | struct carp_softc *sc; |
---|
2267 | |
---|
2268 | TAILQ_FOREACH(sc, &cif->vhif_vrs, sc_list) |
---|
2269 | carp_sc_state_locked(sc); |
---|
2270 | } |
---|
2271 | |
---|
2272 | static void |
---|
2273 | carp_sc_state_locked(struct carp_softc *sc) |
---|
2274 | { |
---|
2275 | CARP_SCLOCK_ASSERT(sc); |
---|
2276 | |
---|
2277 | if (sc->sc_carpdev->if_link_state != LINK_STATE_UP || |
---|
2278 | !(sc->sc_carpdev->if_flags & IFF_UP)) { |
---|
2279 | sc->sc_flags_backup = SC2IFP(sc)->if_flags; |
---|
2280 | SC2IFP(sc)->if_flags &= ~IFF_UP; |
---|
2281 | SC2IFP(sc)->if_drv_flags &= ~IFF_DRV_RUNNING; |
---|
2282 | callout_stop(&sc->sc_ad_tmo); |
---|
2283 | callout_stop(&sc->sc_md_tmo); |
---|
2284 | callout_stop(&sc->sc_md6_tmo); |
---|
2285 | carp_set_state(sc, INIT); |
---|
2286 | carp_setrun(sc, 0); |
---|
2287 | if (!sc->sc_suppress) { |
---|
2288 | carp_suppress_preempt++; |
---|
2289 | if (carp_suppress_preempt == 1) { |
---|
2290 | CARP_SCUNLOCK(sc); |
---|
2291 | carp_send_ad_all(); |
---|
2292 | CARP_SCLOCK(sc); |
---|
2293 | } |
---|
2294 | } |
---|
2295 | sc->sc_suppress = 1; |
---|
2296 | } else { |
---|
2297 | SC2IFP(sc)->if_flags |= sc->sc_flags_backup; |
---|
2298 | carp_set_state(sc, INIT); |
---|
2299 | carp_setrun(sc, 0); |
---|
2300 | if (sc->sc_suppress) |
---|
2301 | carp_suppress_preempt--; |
---|
2302 | sc->sc_suppress = 0; |
---|
2303 | } |
---|
2304 | |
---|
2305 | return; |
---|
2306 | } |
---|
2307 | |
---|
2308 | #ifdef INET |
---|
2309 | extern struct domain inetdomain; |
---|
2310 | static struct protosw in_carp_protosw = { |
---|
2311 | .pr_type = SOCK_RAW, |
---|
2312 | .pr_domain = &inetdomain, |
---|
2313 | .pr_protocol = IPPROTO_CARP, |
---|
2314 | .pr_flags = PR_ATOMIC|PR_ADDR, |
---|
2315 | .pr_input = carp_input, |
---|
2316 | .pr_output = (pr_output_t *)rip_output, |
---|
2317 | .pr_ctloutput = rip_ctloutput, |
---|
2318 | .pr_usrreqs = &rip_usrreqs |
---|
2319 | }; |
---|
2320 | #endif |
---|
2321 | |
---|
2322 | #ifdef INET6 |
---|
2323 | extern struct domain inet6domain; |
---|
2324 | static struct ip6protosw in6_carp_protosw = { |
---|
2325 | .pr_type = SOCK_RAW, |
---|
2326 | .pr_domain = &inet6domain, |
---|
2327 | .pr_protocol = IPPROTO_CARP, |
---|
2328 | .pr_flags = PR_ATOMIC|PR_ADDR, |
---|
2329 | .pr_input = carp6_input, |
---|
2330 | .pr_output = rip6_output, |
---|
2331 | .pr_ctloutput = rip6_ctloutput, |
---|
2332 | .pr_usrreqs = &rip6_usrreqs |
---|
2333 | }; |
---|
2334 | #endif |
---|
2335 | |
---|
2336 | static void |
---|
2337 | carp_mod_cleanup(void) |
---|
2338 | { |
---|
2339 | |
---|
2340 | if (if_detach_event_tag == NULL) |
---|
2341 | return; |
---|
2342 | EVENTHANDLER_DEREGISTER(ifnet_departure_event, if_detach_event_tag); |
---|
2343 | if_clone_detach(&carp_cloner); |
---|
2344 | #ifdef INET |
---|
2345 | if (proto_reg[CARP_INET] == 0) { |
---|
2346 | (void)ipproto_unregister(IPPROTO_CARP); |
---|
2347 | pf_proto_unregister(PF_INET, IPPROTO_CARP, SOCK_RAW); |
---|
2348 | proto_reg[CARP_INET] = -1; |
---|
2349 | } |
---|
2350 | carp_iamatch_p = NULL; |
---|
2351 | #endif |
---|
2352 | #ifdef INET6 |
---|
2353 | if (proto_reg[CARP_INET6] == 0) { |
---|
2354 | (void)ip6proto_unregister(IPPROTO_CARP); |
---|
2355 | pf_proto_unregister(PF_INET6, IPPROTO_CARP, SOCK_RAW); |
---|
2356 | proto_reg[CARP_INET6] = -1; |
---|
2357 | } |
---|
2358 | carp_iamatch6_p = NULL; |
---|
2359 | carp_macmatch6_p = NULL; |
---|
2360 | #endif |
---|
2361 | carp_linkstate_p = NULL; |
---|
2362 | carp_forus_p = NULL; |
---|
2363 | carp_output_p = NULL; |
---|
2364 | mtx_destroy(&carp_mtx); |
---|
2365 | } |
---|
2366 | |
---|
2367 | static int |
---|
2368 | carp_mod_load(void) |
---|
2369 | { |
---|
2370 | int err; |
---|
2371 | |
---|
2372 | if_detach_event_tag = EVENTHANDLER_REGISTER(ifnet_departure_event, |
---|
2373 | carp_ifdetach, NULL, EVENTHANDLER_PRI_ANY); |
---|
2374 | if (if_detach_event_tag == NULL) |
---|
2375 | return (ENOMEM); |
---|
2376 | mtx_init(&carp_mtx, "carp_mtx", NULL, MTX_DEF); |
---|
2377 | LIST_INIT(&carpif_list); |
---|
2378 | if_clone_attach(&carp_cloner); |
---|
2379 | carp_linkstate_p = carp_carpdev_state; |
---|
2380 | carp_forus_p = carp_forus; |
---|
2381 | carp_output_p = carp_output; |
---|
2382 | #ifdef INET6 |
---|
2383 | carp_iamatch6_p = carp_iamatch6; |
---|
2384 | carp_macmatch6_p = carp_macmatch6; |
---|
2385 | proto_reg[CARP_INET6] = pf_proto_register(PF_INET6, |
---|
2386 | (struct protosw *)&in6_carp_protosw); |
---|
2387 | if (proto_reg[CARP_INET6] != 0) { |
---|
2388 | printf("carp: error %d attaching to PF_INET6\n", |
---|
2389 | proto_reg[CARP_INET6]); |
---|
2390 | carp_mod_cleanup(); |
---|
2391 | return (proto_reg[CARP_INET6]); |
---|
2392 | } |
---|
2393 | err = ip6proto_register(IPPROTO_CARP); |
---|
2394 | if (err) { |
---|
2395 | printf("carp: error %d registering with INET6\n", err); |
---|
2396 | carp_mod_cleanup(); |
---|
2397 | return (err); |
---|
2398 | } |
---|
2399 | #endif |
---|
2400 | #ifdef INET |
---|
2401 | carp_iamatch_p = carp_iamatch; |
---|
2402 | proto_reg[CARP_INET] = pf_proto_register(PF_INET, &in_carp_protosw); |
---|
2403 | if (proto_reg[CARP_INET] != 0) { |
---|
2404 | printf("carp: error %d attaching to PF_INET\n", |
---|
2405 | proto_reg[CARP_INET]); |
---|
2406 | carp_mod_cleanup(); |
---|
2407 | return (proto_reg[CARP_INET]); |
---|
2408 | } |
---|
2409 | err = ipproto_register(IPPROTO_CARP); |
---|
2410 | if (err) { |
---|
2411 | printf("carp: error %d registering with INET\n", err); |
---|
2412 | carp_mod_cleanup(); |
---|
2413 | return (err); |
---|
2414 | } |
---|
2415 | #endif |
---|
2416 | return 0; |
---|
2417 | } |
---|
2418 | |
---|
2419 | static int |
---|
2420 | carp_modevent(module_t mod, int type, void *data) |
---|
2421 | { |
---|
2422 | switch (type) { |
---|
2423 | case MOD_LOAD: |
---|
2424 | return carp_mod_load(); |
---|
2425 | /* NOTREACHED */ |
---|
2426 | case MOD_UNLOAD: |
---|
2427 | /* |
---|
2428 | * XXX: For now, disallow module unloading by default due to |
---|
2429 | * a race condition where a thread may dereference one of the |
---|
2430 | * function pointer hooks after the module has been |
---|
2431 | * unloaded, during processing of a packet, causing a panic. |
---|
2432 | */ |
---|
2433 | #ifdef CARPMOD_CAN_UNLOAD |
---|
2434 | carp_mod_cleanup(); |
---|
2435 | #else |
---|
2436 | return (EBUSY); |
---|
2437 | #endif |
---|
2438 | break; |
---|
2439 | |
---|
2440 | default: |
---|
2441 | return (EINVAL); |
---|
2442 | } |
---|
2443 | |
---|
2444 | return (0); |
---|
2445 | } |
---|
2446 | |
---|
2447 | static moduledata_t carp_mod = { |
---|
2448 | "carp", |
---|
2449 | carp_modevent, |
---|
2450 | 0 |
---|
2451 | }; |
---|
2452 | |
---|
2453 | DECLARE_MODULE(carp, carp_mod, SI_SUB_PROTO_DOMAIN, SI_ORDER_ANY); |
---|