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1 | office | 1 | /** |
2 | * @file |
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3 | * Management Information Base II (RFC1213) UDP objects and functions. |
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4 | */ |
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5 | |||
6 | /* |
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7 | * Copyright (c) 2006 Axon Digital Design B.V., The Netherlands. |
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8 | * All rights reserved. |
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9 | * |
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10 | * Redistribution and use in source and binary forms, with or without modification, |
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11 | * are permitted provided that the following conditions are met: |
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12 | * |
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13 | * 1. Redistributions of source code must retain the above copyright notice, |
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14 | * this list of conditions and the following disclaimer. |
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15 | * 2. Redistributions in binary form must reproduce the above copyright notice, |
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16 | * this list of conditions and the following disclaimer in the documentation |
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17 | * and/or other materials provided with the distribution. |
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18 | * 3. The name of the author may not be used to endorse or promote products |
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19 | * derived from this software without specific prior written permission. |
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20 | * |
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21 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED |
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22 | * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF |
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23 | * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT |
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24 | * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, |
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25 | * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT |
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26 | * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
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27 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
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28 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING |
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29 | * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY |
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30 | * OF SUCH DAMAGE. |
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31 | * |
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32 | * Author: Dirk Ziegelmeier <dziegel@gmx.de> |
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33 | * Christiaan Simons <christiaan.simons@axon.tv> |
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34 | */ |
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35 | |||
36 | #include "lwip/snmp.h" |
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37 | #include "lwip/apps/snmp.h" |
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38 | #include "lwip/apps/snmp_core.h" |
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39 | #include "lwip/apps/snmp_mib2.h" |
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40 | #include "lwip/apps/snmp_table.h" |
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41 | #include "lwip/apps/snmp_scalar.h" |
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42 | #include "lwip/udp.h" |
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43 | #include "lwip/stats.h" |
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44 | |||
45 | #include <string.h> |
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46 | |||
47 | #if LWIP_SNMP && SNMP_LWIP_MIB2 && LWIP_UDP |
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48 | |||
49 | #if SNMP_USE_NETCONN |
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50 | #define SYNC_NODE_NAME(node_name) node_name ## _synced |
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51 | #define CREATE_LWIP_SYNC_NODE(oid, node_name) \ |
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52 | static const struct snmp_threadsync_node node_name ## _synced = SNMP_CREATE_THREAD_SYNC_NODE(oid, &node_name.node, &snmp_mib2_lwip_locks); |
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53 | #else |
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54 | #define SYNC_NODE_NAME(node_name) node_name |
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55 | #define CREATE_LWIP_SYNC_NODE(oid, node_name) |
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56 | #endif |
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57 | |||
58 | /* --- udp .1.3.6.1.2.1.7 ----------------------------------------------------- */ |
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59 | |||
60 | static s16_t |
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61 | udp_get_value(struct snmp_node_instance *instance, void *value) |
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62 | { |
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63 | u32_t *uint_ptr = (u32_t *)value; |
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64 | |||
65 | switch (instance->node->oid) { |
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66 | case 1: /* udpInDatagrams */ |
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67 | *uint_ptr = STATS_GET(mib2.udpindatagrams); |
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68 | return sizeof(*uint_ptr); |
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69 | case 2: /* udpNoPorts */ |
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70 | *uint_ptr = STATS_GET(mib2.udpnoports); |
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71 | return sizeof(*uint_ptr); |
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72 | case 3: /* udpInErrors */ |
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73 | *uint_ptr = STATS_GET(mib2.udpinerrors); |
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74 | return sizeof(*uint_ptr); |
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75 | case 4: /* udpOutDatagrams */ |
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76 | *uint_ptr = STATS_GET(mib2.udpoutdatagrams); |
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77 | return sizeof(*uint_ptr); |
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78 | #if LWIP_HAVE_INT64 |
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79 | case 8: { /* udpHCInDatagrams */ |
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80 | /* use the 32 bit counter for now... */ |
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81 | u64_t val64 = STATS_GET(mib2.udpindatagrams); |
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82 | *((u64_t *)value) = val64; |
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83 | } |
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84 | return sizeof(u64_t); |
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85 | case 9: { /* udpHCOutDatagrams */ |
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86 | /* use the 32 bit counter for now... */ |
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87 | u64_t val64 = STATS_GET(mib2.udpoutdatagrams); |
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88 | *((u64_t *)value) = val64; |
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89 | } |
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90 | return sizeof(u64_t); |
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91 | #endif |
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92 | default: |
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93 | LWIP_DEBUGF(SNMP_MIB_DEBUG, ("udp_get_value(): unknown id: %"S32_F"\n", instance->node->oid)); |
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94 | break; |
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95 | } |
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96 | |||
97 | return 0; |
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98 | } |
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99 | |||
100 | /* --- udpEndpointTable --- */ |
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101 | |||
102 | static snmp_err_t |
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103 | udp_endpointTable_get_cell_value_core(const u32_t *column, union snmp_variant_value *value) |
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104 | { |
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105 | /* all items except udpEndpointProcess are declared as not-accessible */ |
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106 | switch (*column) { |
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107 | case 8: /* udpEndpointProcess */ |
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108 | value->u32 = 0; /* not supported */ |
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109 | break; |
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110 | default: |
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111 | return SNMP_ERR_NOSUCHINSTANCE; |
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112 | } |
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113 | |||
114 | return SNMP_ERR_NOERROR; |
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115 | } |
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116 | |||
117 | static snmp_err_t |
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118 | udp_endpointTable_get_cell_value(const u32_t *column, const u32_t *row_oid, u8_t row_oid_len, union snmp_variant_value *value, u32_t *value_len) |
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119 | { |
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120 | ip_addr_t local_ip, remote_ip; |
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121 | u16_t local_port, remote_port; |
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122 | struct udp_pcb *pcb; |
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123 | u8_t idx = 0; |
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124 | |||
125 | LWIP_UNUSED_ARG(value_len); |
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126 | |||
127 | /* udpEndpointLocalAddressType + udpEndpointLocalAddress + udpEndpointLocalPort */ |
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128 | idx += snmp_oid_to_ip_port(&row_oid[idx], row_oid_len - idx, &local_ip, &local_port); |
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129 | if (idx == 0) { |
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130 | return SNMP_ERR_NOSUCHINSTANCE; |
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131 | } |
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132 | |||
133 | /* udpEndpointRemoteAddressType + udpEndpointRemoteAddress + udpEndpointRemotePort */ |
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134 | idx += snmp_oid_to_ip_port(&row_oid[idx], row_oid_len - idx, &remote_ip, &remote_port); |
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135 | if (idx == 0) { |
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136 | return SNMP_ERR_NOSUCHINSTANCE; |
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137 | } |
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138 | |||
139 | /* udpEndpointInstance */ |
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140 | if (row_oid_len < (idx + 1)) { |
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141 | return SNMP_ERR_NOSUCHINSTANCE; |
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142 | } |
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143 | if (row_oid[idx] != 0) { |
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144 | return SNMP_ERR_NOSUCHINSTANCE; |
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145 | } |
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146 | |||
147 | /* find udp_pcb with requested ip and port*/ |
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148 | pcb = udp_pcbs; |
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149 | while (pcb != NULL) { |
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150 | if (ip_addr_cmp(&local_ip, &pcb->local_ip) && |
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151 | (local_port == pcb->local_port) && |
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152 | ip_addr_cmp(&remote_ip, &pcb->remote_ip) && |
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153 | (remote_port == pcb->remote_port)) { |
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154 | /* fill in object properties */ |
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155 | return udp_endpointTable_get_cell_value_core(column, value); |
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156 | } |
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157 | pcb = pcb->next; |
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158 | } |
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159 | |||
160 | /* not found */ |
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161 | return SNMP_ERR_NOSUCHINSTANCE; |
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162 | } |
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163 | |||
164 | static snmp_err_t |
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165 | udp_endpointTable_get_next_cell_instance_and_value(const u32_t *column, struct snmp_obj_id *row_oid, union snmp_variant_value *value, u32_t *value_len) |
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166 | { |
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167 | struct udp_pcb *pcb; |
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168 | struct snmp_next_oid_state state; |
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169 | /* 1x udpEndpointLocalAddressType + 1x OID len + 16x udpEndpointLocalAddress + 1x udpEndpointLocalPort + |
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170 | * 1x udpEndpointRemoteAddressType + 1x OID len + 16x udpEndpointRemoteAddress + 1x udpEndpointRemotePort + |
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171 | * 1x udpEndpointInstance = 39 |
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172 | */ |
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173 | u32_t result_temp[39]; |
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174 | |||
175 | LWIP_UNUSED_ARG(value_len); |
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176 | |||
177 | /* init struct to search next oid */ |
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178 | snmp_next_oid_init(&state, row_oid->id, row_oid->len, result_temp, LWIP_ARRAYSIZE(result_temp)); |
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179 | |||
180 | /* iterate over all possible OIDs to find the next one */ |
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181 | pcb = udp_pcbs; |
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182 | while (pcb != NULL) { |
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183 | u32_t test_oid[LWIP_ARRAYSIZE(result_temp)]; |
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184 | u8_t idx = 0; |
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185 | |||
186 | /* udpEndpointLocalAddressType + udpEndpointLocalAddress + udpEndpointLocalPort */ |
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187 | idx += snmp_ip_port_to_oid(&pcb->local_ip, pcb->local_port, &test_oid[idx]); |
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188 | |||
189 | /* udpEndpointRemoteAddressType + udpEndpointRemoteAddress + udpEndpointRemotePort */ |
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190 | idx += snmp_ip_port_to_oid(&pcb->remote_ip, pcb->remote_port, &test_oid[idx]); |
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191 | |||
192 | test_oid[idx] = 0; /* udpEndpointInstance */ |
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193 | idx++; |
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194 | |||
195 | /* check generated OID: is it a candidate for the next one? */ |
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196 | snmp_next_oid_check(&state, test_oid, idx, NULL); |
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197 | |||
198 | pcb = pcb->next; |
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199 | } |
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200 | |||
201 | /* did we find a next one? */ |
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202 | if (state.status == SNMP_NEXT_OID_STATUS_SUCCESS) { |
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203 | snmp_oid_assign(row_oid, state.next_oid, state.next_oid_len); |
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204 | /* fill in object properties */ |
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205 | return udp_endpointTable_get_cell_value_core(column, value); |
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206 | } else { |
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207 | /* not found */ |
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208 | return SNMP_ERR_NOSUCHINSTANCE; |
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209 | } |
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210 | } |
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211 | |||
212 | /* --- udpTable --- */ |
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213 | |||
214 | #if LWIP_IPV4 |
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215 | |||
216 | /* list of allowed value ranges for incoming OID */ |
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217 | static const struct snmp_oid_range udp_Table_oid_ranges[] = { |
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218 | { 0, 0xff }, /* IP A */ |
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219 | { 0, 0xff }, /* IP B */ |
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220 | { 0, 0xff }, /* IP C */ |
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221 | { 0, 0xff }, /* IP D */ |
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222 | { 1, 0xffff } /* Port */ |
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223 | }; |
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224 | |||
225 | static snmp_err_t |
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226 | udp_Table_get_cell_value_core(struct udp_pcb *pcb, const u32_t *column, union snmp_variant_value *value, u32_t *value_len) |
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227 | { |
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228 | LWIP_UNUSED_ARG(value_len); |
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229 | |||
230 | switch (*column) { |
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231 | case 1: /* udpLocalAddress */ |
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232 | /* set reference to PCB local IP and return a generic node that copies IP4 addresses */ |
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233 | value->u32 = ip_2_ip4(&pcb->local_ip)->addr; |
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234 | break; |
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235 | case 2: /* udpLocalPort */ |
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236 | /* set reference to PCB local port and return a generic node that copies u16_t values */ |
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237 | value->u32 = pcb->local_port; |
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238 | break; |
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239 | default: |
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240 | return SNMP_ERR_NOSUCHINSTANCE; |
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241 | } |
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242 | |||
243 | return SNMP_ERR_NOERROR; |
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244 | } |
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245 | |||
246 | static snmp_err_t |
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247 | udp_Table_get_cell_value(const u32_t *column, const u32_t *row_oid, u8_t row_oid_len, union snmp_variant_value *value, u32_t *value_len) |
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248 | { |
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249 | ip4_addr_t ip; |
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250 | u16_t port; |
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251 | struct udp_pcb *pcb; |
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252 | |||
253 | /* check if incoming OID length and if values are in plausible range */ |
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254 | if (!snmp_oid_in_range(row_oid, row_oid_len, udp_Table_oid_ranges, LWIP_ARRAYSIZE(udp_Table_oid_ranges))) { |
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255 | return SNMP_ERR_NOSUCHINSTANCE; |
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256 | } |
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257 | |||
258 | /* get IP and port from incoming OID */ |
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259 | snmp_oid_to_ip4(&row_oid[0], &ip); /* we know it succeeds because of oid_in_range check above */ |
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260 | port = (u16_t)row_oid[4]; |
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261 | |||
262 | /* find udp_pcb with requested ip and port*/ |
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263 | pcb = udp_pcbs; |
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264 | while (pcb != NULL) { |
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265 | if (IP_IS_V4_VAL(pcb->local_ip)) { |
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266 | if (ip4_addr_cmp(&ip, ip_2_ip4(&pcb->local_ip)) && (port == pcb->local_port)) { |
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267 | /* fill in object properties */ |
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268 | return udp_Table_get_cell_value_core(pcb, column, value, value_len); |
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269 | } |
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270 | } |
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271 | pcb = pcb->next; |
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272 | } |
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273 | |||
274 | /* not found */ |
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275 | return SNMP_ERR_NOSUCHINSTANCE; |
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276 | } |
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277 | |||
278 | static snmp_err_t |
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279 | udp_Table_get_next_cell_instance_and_value(const u32_t *column, struct snmp_obj_id *row_oid, union snmp_variant_value *value, u32_t *value_len) |
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280 | { |
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281 | struct udp_pcb *pcb; |
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282 | struct snmp_next_oid_state state; |
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283 | u32_t result_temp[LWIP_ARRAYSIZE(udp_Table_oid_ranges)]; |
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284 | |||
285 | /* init struct to search next oid */ |
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286 | snmp_next_oid_init(&state, row_oid->id, row_oid->len, result_temp, LWIP_ARRAYSIZE(udp_Table_oid_ranges)); |
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287 | |||
288 | /* iterate over all possible OIDs to find the next one */ |
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289 | pcb = udp_pcbs; |
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290 | while (pcb != NULL) { |
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291 | u32_t test_oid[LWIP_ARRAYSIZE(udp_Table_oid_ranges)]; |
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292 | |||
293 | if (IP_IS_V4_VAL(pcb->local_ip)) { |
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294 | snmp_ip4_to_oid(ip_2_ip4(&pcb->local_ip), &test_oid[0]); |
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295 | test_oid[4] = pcb->local_port; |
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296 | |||
297 | /* check generated OID: is it a candidate for the next one? */ |
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298 | snmp_next_oid_check(&state, test_oid, LWIP_ARRAYSIZE(udp_Table_oid_ranges), pcb); |
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299 | } |
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300 | |||
301 | pcb = pcb->next; |
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302 | } |
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303 | |||
304 | /* did we find a next one? */ |
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305 | if (state.status == SNMP_NEXT_OID_STATUS_SUCCESS) { |
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306 | snmp_oid_assign(row_oid, state.next_oid, state.next_oid_len); |
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307 | /* fill in object properties */ |
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308 | return udp_Table_get_cell_value_core((struct udp_pcb *)state.reference, column, value, value_len); |
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309 | } else { |
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310 | /* not found */ |
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311 | return SNMP_ERR_NOSUCHINSTANCE; |
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312 | } |
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313 | } |
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314 | |||
315 | #endif /* LWIP_IPV4 */ |
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316 | |||
317 | static const struct snmp_scalar_node udp_inDatagrams = SNMP_SCALAR_CREATE_NODE_READONLY(1, SNMP_ASN1_TYPE_COUNTER, udp_get_value); |
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318 | static const struct snmp_scalar_node udp_noPorts = SNMP_SCALAR_CREATE_NODE_READONLY(2, SNMP_ASN1_TYPE_COUNTER, udp_get_value); |
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319 | static const struct snmp_scalar_node udp_inErrors = SNMP_SCALAR_CREATE_NODE_READONLY(3, SNMP_ASN1_TYPE_COUNTER, udp_get_value); |
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320 | static const struct snmp_scalar_node udp_outDatagrams = SNMP_SCALAR_CREATE_NODE_READONLY(4, SNMP_ASN1_TYPE_COUNTER, udp_get_value); |
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321 | #if LWIP_HAVE_INT64 |
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322 | static const struct snmp_scalar_node udp_HCInDatagrams = SNMP_SCALAR_CREATE_NODE_READONLY(8, SNMP_ASN1_TYPE_COUNTER64, udp_get_value); |
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323 | static const struct snmp_scalar_node udp_HCOutDatagrams = SNMP_SCALAR_CREATE_NODE_READONLY(9, SNMP_ASN1_TYPE_COUNTER64, udp_get_value); |
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324 | #endif |
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325 | |||
326 | #if LWIP_IPV4 |
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327 | static const struct snmp_table_simple_col_def udp_Table_columns[] = { |
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328 | { 1, SNMP_ASN1_TYPE_IPADDR, SNMP_VARIANT_VALUE_TYPE_U32 }, /* udpLocalAddress */ |
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329 | { 2, SNMP_ASN1_TYPE_INTEGER, SNMP_VARIANT_VALUE_TYPE_U32 } /* udpLocalPort */ |
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330 | }; |
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331 | static const struct snmp_table_simple_node udp_Table = SNMP_TABLE_CREATE_SIMPLE(5, udp_Table_columns, udp_Table_get_cell_value, udp_Table_get_next_cell_instance_and_value); |
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332 | #endif /* LWIP_IPV4 */ |
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333 | |||
334 | static const struct snmp_table_simple_col_def udp_endpointTable_columns[] = { |
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335 | /* all items except udpEndpointProcess are declared as not-accessible */ |
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336 | { 8, SNMP_ASN1_TYPE_UNSIGNED32, SNMP_VARIANT_VALUE_TYPE_U32 } /* udpEndpointProcess */ |
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337 | }; |
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338 | |||
339 | static const struct snmp_table_simple_node udp_endpointTable = SNMP_TABLE_CREATE_SIMPLE(7, udp_endpointTable_columns, udp_endpointTable_get_cell_value, udp_endpointTable_get_next_cell_instance_and_value); |
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340 | |||
341 | /* the following nodes access variables in LWIP stack from SNMP worker thread and must therefore be synced to LWIP (TCPIP) thread */ |
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342 | CREATE_LWIP_SYNC_NODE(1, udp_inDatagrams) |
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343 | CREATE_LWIP_SYNC_NODE(2, udp_noPorts) |
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344 | CREATE_LWIP_SYNC_NODE(3, udp_inErrors) |
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345 | CREATE_LWIP_SYNC_NODE(4, udp_outDatagrams) |
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346 | #if LWIP_IPV4 |
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347 | CREATE_LWIP_SYNC_NODE(5, udp_Table) |
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348 | #endif /* LWIP_IPV4 */ |
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349 | CREATE_LWIP_SYNC_NODE(7, udp_endpointTable) |
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350 | #if LWIP_HAVE_INT64 |
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351 | CREATE_LWIP_SYNC_NODE(8, udp_HCInDatagrams) |
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352 | CREATE_LWIP_SYNC_NODE(9, udp_HCOutDatagrams) |
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353 | #endif |
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354 | |||
355 | static const struct snmp_node *const udp_nodes[] = { |
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356 | &SYNC_NODE_NAME(udp_inDatagrams).node.node, |
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357 | &SYNC_NODE_NAME(udp_noPorts).node.node, |
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358 | &SYNC_NODE_NAME(udp_inErrors).node.node, |
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359 | &SYNC_NODE_NAME(udp_outDatagrams).node.node, |
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360 | #if LWIP_IPV4 |
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361 | &SYNC_NODE_NAME(udp_Table).node.node, |
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362 | #endif /* LWIP_IPV4 */ |
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363 | &SYNC_NODE_NAME(udp_endpointTable).node.node |
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364 | #if LWIP_HAVE_INT64 |
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365 | , |
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366 | &SYNC_NODE_NAME(udp_HCInDatagrams).node.node, |
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367 | &SYNC_NODE_NAME(udp_HCOutDatagrams).node.node |
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368 | #endif |
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369 | }; |
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370 | |||
371 | const struct snmp_tree_node snmp_mib2_udp_root = SNMP_CREATE_TREE_NODE(7, udp_nodes); |
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372 | #endif /* LWIP_SNMP && SNMP_LWIP_MIB2 && LWIP_UDP */ |