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) 2016 Yandex LLC |
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5 | * Copyright (c) 2016 Andrey V. Elsukov <ae@FreeBSD.org> |
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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 AND CONTRIBUTORS ``AS IS'' AND |
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17 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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18 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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19 | * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE |
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20 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
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21 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
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22 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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23 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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24 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
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25 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
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26 | * 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 <sys/param.h> |
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33 | #include <sys/systm.h> |
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34 | #include <sys/mbuf.h> |
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35 | #include <sys/kernel.h> |
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36 | #include <sys/lock.h> |
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37 | #include <sys/rmlock.h> |
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38 | #include <sys/socket.h> |
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39 | #include <net/ethernet.h> |
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40 | #include <net/if.h> |
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41 | #include <net/if_pflog.h> |
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42 | #include <net/if_var.h> |
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43 | #include <net/if_clone.h> |
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44 | #include <net/if_types.h> |
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45 | #include <net/vnet.h> |
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46 | #include <net/bpf.h> |
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47 | |
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48 | #include <netinet/in.h> |
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49 | #include <netinet/ip_fw.h> |
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50 | #include <netinet/ip_var.h> |
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51 | #include <netpfil/ipfw/ip_fw_private.h> |
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52 | |
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53 | static VNET_DEFINE(struct ifnet *, log_if); |
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54 | static VNET_DEFINE(struct ifnet *, pflog_if); |
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55 | static VNET_DEFINE(struct if_clone *, ipfw_cloner); |
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56 | static VNET_DEFINE(struct if_clone *, ipfwlog_cloner); |
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57 | #define V_ipfw_cloner VNET(ipfw_cloner) |
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58 | #define V_ipfwlog_cloner VNET(ipfwlog_cloner) |
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59 | #define V_log_if VNET(log_if) |
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60 | #define V_pflog_if VNET(pflog_if) |
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61 | |
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62 | static struct rmlock log_if_lock; |
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63 | #define LOGIF_LOCK_INIT(x) rm_init(&log_if_lock, "ipfw log_if lock") |
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64 | #define LOGIF_LOCK_DESTROY(x) rm_destroy(&log_if_lock) |
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65 | #define LOGIF_RLOCK_TRACKER struct rm_priotracker _log_tracker |
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66 | #define LOGIF_RLOCK(x) rm_rlock(&log_if_lock, &_log_tracker) |
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67 | #define LOGIF_RUNLOCK(x) rm_runlock(&log_if_lock, &_log_tracker) |
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68 | #define LOGIF_WLOCK(x) rm_wlock(&log_if_lock) |
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69 | #define LOGIF_WUNLOCK(x) rm_wunlock(&log_if_lock) |
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70 | |
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71 | static const char ipfwname[] = "ipfw"; |
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72 | static const char ipfwlogname[] = "ipfwlog"; |
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73 | |
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74 | static int |
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75 | ipfw_bpf_ioctl(struct ifnet *ifp, u_long cmd, caddr_t addr) |
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76 | { |
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77 | |
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78 | return (EINVAL); |
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79 | } |
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80 | |
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81 | static int |
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82 | ipfw_bpf_output(struct ifnet *ifp, struct mbuf *m, |
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83 | const struct sockaddr *dst, struct route *ro) |
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84 | { |
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85 | |
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86 | if (m != NULL) |
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87 | FREE_PKT(m); |
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88 | return (0); |
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89 | } |
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90 | |
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91 | static void |
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92 | ipfw_clone_destroy(struct ifnet *ifp) |
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93 | { |
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94 | |
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95 | LOGIF_WLOCK(); |
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96 | if (ifp->if_hdrlen == ETHER_HDR_LEN) |
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97 | V_log_if = NULL; |
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98 | else |
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99 | V_pflog_if = NULL; |
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100 | LOGIF_WUNLOCK(); |
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101 | |
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102 | bpfdetach(ifp); |
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103 | if_detach(ifp); |
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104 | if_free(ifp); |
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105 | } |
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106 | |
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107 | static int |
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108 | ipfw_clone_create(struct if_clone *ifc, int unit, caddr_t params) |
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109 | { |
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110 | struct ifnet *ifp; |
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111 | |
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112 | ifp = if_alloc(IFT_PFLOG); |
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113 | if (ifp == NULL) |
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114 | return (ENOSPC); |
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115 | if_initname(ifp, ipfwname, unit); |
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116 | ifp->if_flags = IFF_UP | IFF_SIMPLEX | IFF_MULTICAST; |
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117 | ifp->if_mtu = 65536; |
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118 | ifp->if_ioctl = ipfw_bpf_ioctl; |
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119 | ifp->if_output = ipfw_bpf_output; |
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120 | ifp->if_hdrlen = ETHER_HDR_LEN; |
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121 | if_attach(ifp); |
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122 | bpfattach(ifp, DLT_EN10MB, ETHER_HDR_LEN); |
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123 | LOGIF_WLOCK(); |
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124 | if (V_log_if != NULL) { |
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125 | LOGIF_WUNLOCK(); |
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126 | bpfdetach(ifp); |
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127 | if_detach(ifp); |
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128 | if_free(ifp); |
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129 | return (EEXIST); |
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130 | } |
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131 | V_log_if = ifp; |
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132 | LOGIF_WUNLOCK(); |
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133 | return (0); |
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134 | } |
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135 | |
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136 | static int |
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137 | ipfwlog_clone_create(struct if_clone *ifc, int unit, caddr_t params) |
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138 | { |
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139 | struct ifnet *ifp; |
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140 | |
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141 | ifp = if_alloc(IFT_PFLOG); |
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142 | if (ifp == NULL) |
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143 | return (ENOSPC); |
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144 | if_initname(ifp, ipfwlogname, unit); |
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145 | ifp->if_flags = IFF_UP | IFF_SIMPLEX | IFF_MULTICAST; |
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146 | ifp->if_mtu = 65536; |
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147 | ifp->if_ioctl = ipfw_bpf_ioctl; |
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148 | ifp->if_output = ipfw_bpf_output; |
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149 | ifp->if_hdrlen = PFLOG_HDRLEN; |
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150 | if_attach(ifp); |
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151 | bpfattach(ifp, DLT_PFLOG, PFLOG_HDRLEN); |
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152 | LOGIF_WLOCK(); |
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153 | if (V_pflog_if != NULL) { |
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154 | LOGIF_WUNLOCK(); |
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155 | bpfdetach(ifp); |
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156 | if_detach(ifp); |
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157 | if_free(ifp); |
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158 | return (EEXIST); |
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159 | } |
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160 | V_pflog_if = ifp; |
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161 | LOGIF_WUNLOCK(); |
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162 | return (0); |
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163 | } |
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164 | |
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165 | void |
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166 | ipfw_bpf_mtap2(void *data, u_int dlen, struct mbuf *m) |
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167 | { |
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168 | LOGIF_RLOCK_TRACKER; |
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169 | |
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170 | LOGIF_RLOCK(); |
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171 | if (dlen == ETHER_HDR_LEN) { |
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172 | if (V_log_if == NULL) { |
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173 | LOGIF_RUNLOCK(); |
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174 | return; |
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175 | } |
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176 | BPF_MTAP2(V_log_if, data, dlen, m); |
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177 | } else if (dlen == PFLOG_HDRLEN) { |
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178 | if (V_pflog_if == NULL) { |
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179 | LOGIF_RUNLOCK(); |
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180 | return; |
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181 | } |
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182 | BPF_MTAP2(V_pflog_if, data, dlen, m); |
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183 | } |
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184 | LOGIF_RUNLOCK(); |
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185 | } |
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186 | |
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187 | void |
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188 | ipfw_bpf_init(int first) |
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189 | { |
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190 | |
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191 | if (first) { |
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192 | LOGIF_LOCK_INIT(); |
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193 | V_log_if = NULL; |
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194 | V_pflog_if = NULL; |
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195 | } |
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196 | V_ipfw_cloner = if_clone_simple(ipfwname, ipfw_clone_create, |
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197 | ipfw_clone_destroy, 0); |
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198 | V_ipfwlog_cloner = if_clone_simple(ipfwlogname, ipfwlog_clone_create, |
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199 | ipfw_clone_destroy, 0); |
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200 | } |
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201 | |
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202 | void |
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203 | ipfw_bpf_uninit(int last) |
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204 | { |
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205 | |
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206 | if_clone_detach(V_ipfw_cloner); |
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207 | if_clone_detach(V_ipfwlog_cloner); |
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208 | if (last) |
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209 | LOGIF_LOCK_DESTROY(); |
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210 | } |
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211 | |
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